[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl3945-base.c

/******************************************************************************
 *
 * Copyright(c) 2003 - 2008 Intel Corporation. All rights reserved.
 *
 * Portions of this file are derived from the ipw3945 project, as well
 * as portions of the ieee80211 subsystem header files.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 *
 * The full GNU General Public License is included in this distribution in the
 * file called LICENSE.
 *
 * Contact Information:
 * James P. Ketrenos <ipw2100-admin@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 *****************************************************************************/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/wireless.h>
#include <linux/firmware.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>

#include <net/ieee80211_radiotap.h>
#include <net/lib80211.h>
#include <net/mac80211.h>

#include <asm/div64.h>

#include "iwl-3945-core.h"
#include "iwl-3945.h"
#include "iwl-helpers.h"

#ifdef CONFIG_IWL3945_DEBUG
u32 iwl3945_debug_level;
#endif

static int iwl3945_tx_queue_update_write_ptr(struct iwl3945_priv *priv,
                                  struct iwl3945_tx_queue *txq);

/******************************************************************************
 *
 * module boiler plate
 *
 ******************************************************************************/

/* module parameters */
static int iwl3945_param_disable_hw_scan; /* def: 0 = use 3945's h/w scan */
static int iwl3945_param_debug;    /* def: 0 = minimal debug log messages */
static int iwl3945_param_disable;  /* def: 0 = enable radio */
static int iwl3945_param_antenna;  /* def: 0 = both antennas (use diversity) */
int iwl3945_param_hwcrypto;        /* def: 0 = use software encryption */
static int iwl3945_param_qos_enable = 1; /* def: 1 = use quality of service */
int iwl3945_param_queues_num = IWL39_MAX_NUM_QUEUES; /* def: 8 Tx queues */

/*
 * module name, copyright, version, etc.
 * NOTE: DRV_NAME is defined in iwlwifi.h for use by iwl-debug.h and printk
 */

#define DRV_DESCRIPTION \
"Intel(R) PRO/Wireless 3945ABG/BG Network Connection driver for Linux"

#ifdef CONFIG_IWL3945_DEBUG
#define VD "d"
#else
#define VD
#endif

#ifdef CONFIG_IWL3945_SPECTRUM_MEASUREMENT
#define VS "s"
#else
#define VS
#endif

#define IWLWIFI_VERSION "1.2.26k" VD VS
#define DRV_COPYRIGHT   "Copyright(c) 2003-2008 Intel Corporation"
#define DRV_VERSION     IWLWIFI_VERSION


MODULE_DESCRIPTION(DRV_DESCRIPTION);
MODULE_VERSION(DRV_VERSION);
MODULE_AUTHOR(DRV_COPYRIGHT);
MODULE_LICENSE("GPL");

static const struct ieee80211_supported_band *iwl3945_get_band(
                struct iwl3945_priv *priv, enum ieee80211_band band)
{
        return priv->hw->wiphy->bands[band];
}

/*************** DMA-QUEUE-GENERAL-FUNCTIONS  *****
 * DMA services
 *
 * Theory of operation
 *
 * A Tx or Rx queue resides in host DRAM, and is comprised of a circular buffer
 * of buffer descriptors, each of which points to one or more data buffers for
 * the device to read from or fill.  Driver and device exchange status of each
 * queue via "read" and "write" pointers.  Driver keeps minimum of 2 empty
 * entries in each circular buffer, to protect against confusing empty and full
 * queue states.
 *
 * The device reads or writes the data in the queues via the device's several
 * DMA/FIFO channels.  Each queue is mapped to a single DMA channel.
 *
 * For Tx queue, there are low mark and high mark limits. If, after queuing
 * the packet for Tx, free space become < low mark, Tx queue stopped. When
 * reclaiming packets (on 'tx done IRQ), if free space become > high mark,
 * Tx queue resumed.
 *
 * The 3945 operates with six queues:  One receive queue, one transmit queue
 * (#4) for sending commands to the device firmware, and four transmit queues
 * (#0-3) for data tx via EDCA.  An additional 2 HCCA queues are unused.
 ***************************************************/

int iwl3945_queue_space(const struct iwl3945_queue *q)
{
        int s = q->read_ptr - q->write_ptr;

        if (q->read_ptr > q->write_ptr)
                s -= q->n_bd;

        if (s <= 0)
                s += q->n_window;
        /* keep some reserve to not confuse empty and full situations */
        s -= 2;
        if (s < 0)
                s = 0;
        return s;
}

int iwl3945_x2_queue_used(const struct iwl3945_queue *q, int i)
{
        return q->write_ptr > q->read_ptr ?
                (i >= q->read_ptr && i < q->write_ptr) :
                !(i < q->read_ptr && i >= q->write_ptr);
}


static inline u8 get_cmd_index(struct iwl3945_queue *q, u32 index, int is_huge)
{
        /* This is for scan command, the big buffer at end of command array */
        if (is_huge)
                return q->n_window;     /* must be power of 2 */

        /* Otherwise, use normal size buffers */
        return index & (q->n_window - 1);
}

/**
 * iwl3945_queue_init - Initialize queue's high/low-water and read/write indexes
 */
static int iwl3945_queue_init(struct iwl3945_priv *priv, struct iwl3945_queue *q,
                          int count, int slots_num, u32 id)
{
        q->n_bd = count;
        q->n_window = slots_num;
        q->id = id;

        /* count must be power-of-two size, otherwise iwl_queue_inc_wrap
         * and iwl_queue_dec_wrap are broken. */
        BUG_ON(!is_power_of_2(count));

        /* slots_num must be power-of-two size, otherwise
         * get_cmd_index is broken. */
        BUG_ON(!is_power_of_2(slots_num));

        q->low_mark = q->n_window / 4;
        if (q->low_mark < 4)
                q->low_mark = 4;

        q->high_mark = q->n_window / 8;
        if (q->high_mark < 2)
                q->high_mark = 2;

        q->write_ptr = q->read_ptr = 0;

        return 0;
}

/**
 * iwl3945_tx_queue_alloc - Alloc driver data and TFD CB for one Tx/cmd queue
 */
static int iwl3945_tx_queue_alloc(struct iwl3945_priv *priv,
                              struct iwl3945_tx_queue *txq, u32 id)
{
        struct pci_dev *dev = priv->pci_dev;

        /* Driver private data, only for Tx (not command) queues,
         * not shared with device. */
        if (id != IWL_CMD_QUEUE_NUM) {
                txq->txb = kmalloc(sizeof(txq->txb[0]) *
                                   TFD_QUEUE_SIZE_MAX, GFP_KERNEL);
                if (!txq->txb) {
                        IWL_ERROR("kmalloc for auxiliary BD "
                                  "structures failed\n");
                        goto error;
                }
        } else
                txq->txb = NULL;

        /* Circular buffer of transmit frame descriptors (TFDs),
         * shared with device */
        txq->bd = pci_alloc_consistent(dev,
                        sizeof(txq->bd[0]) * TFD_QUEUE_SIZE_MAX,
                        &txq->q.dma_addr);

        if (!txq->bd) {
                IWL_ERROR("pci_alloc_consistent(%zd) failed\n",
                          sizeof(txq->bd[0]) * TFD_QUEUE_SIZE_MAX);
                goto error;
        }
        txq->q.id = id;

        return 0;

 error:
        kfree(txq->txb);
        txq->txb = NULL;

        return -ENOMEM;
}

/**
 * iwl3945_tx_queue_init - Allocate and initialize one tx/cmd queue
 */
int iwl3945_tx_queue_init(struct iwl3945_priv *priv,
                      struct iwl3945_tx_queue *txq, int slots_num, u32 txq_id)
{
        struct pci_dev *dev = priv->pci_dev;
        int len;
        int rc = 0;

        /*
         * Alloc buffer array for commands (Tx or other types of commands).
         * For the command queue (#4), allocate command space + one big
         * command for scan, since scan command is very huge; the system will
         * not have two scans at the same time, so only one is needed.
         * For data Tx queues (all other queues), no super-size command
         * space is needed.
         */
        len = sizeof(struct iwl3945_cmd) * slots_num;
        if (txq_id == IWL_CMD_QUEUE_NUM)
                len +=  IWL_MAX_SCAN_SIZE;
        txq->cmd = pci_alloc_consistent(dev, len, &txq->dma_addr_cmd);
        if (!txq->cmd)
                return -ENOMEM;

        /* Alloc driver data array and TFD circular buffer */
        rc = iwl3945_tx_queue_alloc(priv, txq, txq_id);
        if (rc) {
                pci_free_consistent(dev, len, txq->cmd, txq->dma_addr_cmd);

                return -ENOMEM;
        }
        txq->need_update = 0;

        /* TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise
         * iwl_queue_inc_wrap and iwl_queue_dec_wrap are broken. */
        BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1));

        /* Initialize queue high/low-water, head/tail indexes */
        iwl3945_queue_init(priv, &txq->q, TFD_QUEUE_SIZE_MAX, slots_num, txq_id);

        /* Tell device where to find queue, enable DMA channel. */
        iwl3945_hw_tx_queue_init(priv, txq);

        return 0;
}

/**
 * iwl3945_tx_queue_free - Deallocate DMA queue.
 * @txq: Transmit queue to deallocate.
 *
 * Empty queue by removing and destroying all BD's.
 * Free all buffers.
 * 0-fill, but do not free "txq" descriptor structure.
 */
void iwl3945_tx_queue_free(struct iwl3945_priv *priv, struct iwl3945_tx_queue *txq)
{
        struct iwl3945_queue *q = &txq->q;
        struct pci_dev *dev = priv->pci_dev;
        int len;

        if (q->n_bd == 0)
                return;

        /* first, empty all BD's */
        for (; q->write_ptr != q->read_ptr;
             q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd))
                iwl3945_hw_txq_free_tfd(priv, txq);

        len = sizeof(struct iwl3945_cmd) * q->n_window;
        if (q->id == IWL_CMD_QUEUE_NUM)
                len += IWL_MAX_SCAN_SIZE;

        /* De-alloc array of command/tx buffers */
        pci_free_consistent(dev, len, txq->cmd, txq->dma_addr_cmd);

        /* De-alloc circular buffer of TFDs */
        if (txq->q.n_bd)
                pci_free_consistent(dev, sizeof(struct iwl3945_tfd_frame) *
                                    txq->q.n_bd, txq->bd, txq->q.dma_addr);

        /* De-alloc array of per-TFD driver data */
        kfree(txq->txb);
        txq->txb = NULL;

        /* 0-fill queue descriptor structure */
        memset(txq, 0, sizeof(*txq));
}

const u8 iwl3945_broadcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };

/*************** STATION TABLE MANAGEMENT ****
 * mac80211 should be examined to determine if sta_info is duplicating
 * the functionality provided here
 */

/**************************************************************/
#if 0 /* temporary disable till we add real remove station */
/**
 * iwl3945_remove_station - Remove driver's knowledge of station.
 *
 * NOTE:  This does not remove station from device's station table.
 */
static u8 iwl3945_remove_station(struct iwl3945_priv *priv, const u8 *addr, int is_ap)
{
        int index = IWL_INVALID_STATION;
        int i;
        unsigned long flags;

        spin_lock_irqsave(&priv->sta_lock, flags);

        if (is_ap)
                index = IWL_AP_ID;
        else if (is_broadcast_ether_addr(addr))
                index = priv->hw_setting.bcast_sta_id;
        else
                for (i = IWL_STA_ID; i < priv->hw_setting.max_stations; i++)
                        if (priv->stations[i].used &&
                            !compare_ether_addr(priv->stations[i].sta.sta.addr,
                                                addr)) {
                                index = i;
                                break;
                        }

        if (unlikely(index == IWL_INVALID_STATION))
                goto out;

        if (priv->stations[index].used) {
                priv->stations[index].used = 0;
                priv->num_stations--;
        }

        BUG_ON(priv->num_stations < 0);

out:
        spin_unlock_irqrestore(&priv->sta_lock, flags);
        return 0;
}
#endif

/**
 * iwl3945_clear_stations_table - Clear the driver's station table
 *
 * NOTE:  This does not clear or otherwise alter the device's station table.
 */
static void iwl3945_clear_stations_table(struct iwl3945_priv *priv)
{
        unsigned long flags;

        spin_lock_irqsave(&priv->sta_lock, flags);

        priv->num_stations = 0;
        memset(priv->stations, 0, sizeof(priv->stations));

        spin_unlock_irqrestore(&priv->sta_lock, flags);
}

/**
 * iwl3945_add_station - Add station to station tables in driver and device
 */
u8 iwl3945_add_station(struct iwl3945_priv *priv, const u8 *addr, int is_ap, u8 flags)
{
        int i;
        int index = IWL_INVALID_STATION;
        struct iwl3945_station_entry *station;
        unsigned long flags_spin;
        u8 rate;

        spin_lock_irqsave(&priv->sta_lock, flags_spin);
        if (is_ap)
                index = IWL_AP_ID;
        else if (is_broadcast_ether_addr(addr))
                index = priv->hw_setting.bcast_sta_id;
        else
                for (i = IWL_STA_ID; i < priv->hw_setting.max_stations; i++) {
                        if (!compare_ether_addr(priv->stations[i].sta.sta.addr,
                                                addr)) {
                                index = i;
                                break;
                        }

                        if (!priv->stations[i].used &&
                            index == IWL_INVALID_STATION)
                                index = i;
                }

        /* These two conditions has the same outcome but keep them separate
          since they have different meaning */
        if (unlikely(index == IWL_INVALID_STATION)) {
                spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
                return index;
        }

        if (priv->stations[index].used &&
           !compare_ether_addr(priv->stations[index].sta.sta.addr, addr)) {
                spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
                return index;
        }

        IWL_DEBUG_ASSOC("Add STA ID %d: %pM\n", index, addr);
        station = &priv->stations[index];
        station->used = 1;
        priv->num_stations++;

        /* Set up the REPLY_ADD_STA command to send to device */
        memset(&station->sta, 0, sizeof(struct iwl3945_addsta_cmd));
        memcpy(station->sta.sta.addr, addr, ETH_ALEN);
        station->sta.mode = 0;
        station->sta.sta.sta_id = index;
        station->sta.station_flags = 0;

        if (priv->band == IEEE80211_BAND_5GHZ)
                rate = IWL_RATE_6M_PLCP;
        else
                rate =  IWL_RATE_1M_PLCP;

        /* Turn on both antennas for the station... */
        station->sta.rate_n_flags =
                        iwl3945_hw_set_rate_n_flags(rate, RATE_MCS_ANT_AB_MSK);
        station->current_rate.rate_n_flags =
                        le16_to_cpu(station->sta.rate_n_flags);

        spin_unlock_irqrestore(&priv->sta_lock, flags_spin);

        /* Add station to device's station table */
        iwl3945_send_add_station(priv, &station->sta, flags);
        return index;

}

/*************** DRIVER STATUS FUNCTIONS   *****/

static inline int iwl3945_is_ready(struct iwl3945_priv *priv)
{
        /* The adapter is 'ready' if READY and GEO_CONFIGURED bits are
         * set but EXIT_PENDING is not */
        return test_bit(STATUS_READY, &priv->status) &&
               test_bit(STATUS_GEO_CONFIGURED, &priv->status) &&
               !test_bit(STATUS_EXIT_PENDING, &priv->status);
}

static inline int iwl3945_is_alive(struct iwl3945_priv *priv)
{
        return test_bit(STATUS_ALIVE, &priv->status);
}

static inline int iwl3945_is_init(struct iwl3945_priv *priv)
{
        return test_bit(STATUS_INIT, &priv->status);
}

static inline int iwl3945_is_rfkill_sw(struct iwl3945_priv *priv)
{
        return test_bit(STATUS_RF_KILL_SW, &priv->status);
}

static inline int iwl3945_is_rfkill_hw(struct iwl3945_priv *priv)
{
        return test_bit(STATUS_RF_KILL_HW, &priv->status);
}

static inline int iwl3945_is_rfkill(struct iwl3945_priv *priv)
{
        return iwl3945_is_rfkill_hw(priv) ||
                iwl3945_is_rfkill_sw(priv);
}

static inline int iwl3945_is_ready_rf(struct iwl3945_priv *priv)
{

        if (iwl3945_is_rfkill(priv))
                return 0;

        return iwl3945_is_ready(priv);
}

/*************** HOST COMMAND QUEUE FUNCTIONS   *****/

#define IWL_CMD(x) case x: return #x

static const char *get_cmd_string(u8 cmd)
{
        switch (cmd) {
                IWL_CMD(REPLY_ALIVE);
                IWL_CMD(REPLY_ERROR);
                IWL_CMD(REPLY_RXON);
                IWL_CMD(REPLY_RXON_ASSOC);
                IWL_CMD(REPLY_QOS_PARAM);
                IWL_CMD(REPLY_RXON_TIMING);
                IWL_CMD(REPLY_ADD_STA);
                IWL_CMD(REPLY_REMOVE_STA);
                IWL_CMD(REPLY_REMOVE_ALL_STA);
                IWL_CMD(REPLY_3945_RX);
                IWL_CMD(REPLY_TX);
                IWL_CMD(REPLY_RATE_SCALE);
                IWL_CMD(REPLY_LEDS_CMD);
                IWL_CMD(REPLY_TX_LINK_QUALITY_CMD);
                IWL_CMD(RADAR_NOTIFICATION);
                IWL_CMD(REPLY_QUIET_CMD);
                IWL_CMD(REPLY_CHANNEL_SWITCH);
                IWL_CMD(CHANNEL_SWITCH_NOTIFICATION);
                IWL_CMD(REPLY_SPECTRUM_MEASUREMENT_CMD);
                IWL_CMD(SPECTRUM_MEASURE_NOTIFICATION);
                IWL_CMD(POWER_TABLE_CMD);
                IWL_CMD(PM_SLEEP_NOTIFICATION);
                IWL_CMD(PM_DEBUG_STATISTIC_NOTIFIC);
                IWL_CMD(REPLY_SCAN_CMD);
                IWL_CMD(REPLY_SCAN_ABORT_CMD);
                IWL_CMD(SCAN_START_NOTIFICATION);
                IWL_CMD(SCAN_RESULTS_NOTIFICATION);
                IWL_CMD(SCAN_COMPLETE_NOTIFICATION);
                IWL_CMD(BEACON_NOTIFICATION);
                IWL_CMD(REPLY_TX_BEACON);
                IWL_CMD(WHO_IS_AWAKE_NOTIFICATION);
                IWL_CMD(QUIET_NOTIFICATION);
                IWL_CMD(REPLY_TX_PWR_TABLE_CMD);
                IWL_CMD(MEASURE_ABORT_NOTIFICATION);
                IWL_CMD(REPLY_BT_CONFIG);
                IWL_CMD(REPLY_STATISTICS_CMD);
                IWL_CMD(STATISTICS_NOTIFICATION);
                IWL_CMD(REPLY_CARD_STATE_CMD);
                IWL_CMD(CARD_STATE_NOTIFICATION);
                IWL_CMD(MISSED_BEACONS_NOTIFICATION);
        default:
                return "UNKNOWN";

        }
}

#define HOST_COMPLETE_TIMEOUT (HZ / 2)

/**
 * iwl3945_enqueue_hcmd - enqueue a uCode command
 * @priv: device private data point
 * @cmd: a point to the ucode command structure
 *
 * The function returns < 0 values to indicate the operation is
 * failed. On success, it turns the index (> 0) of command in the
 * command queue.
 */
static int iwl3945_enqueue_hcmd(struct iwl3945_priv *priv, struct iwl3945_host_cmd *cmd)
{
        struct iwl3945_tx_queue *txq = &priv->txq[IWL_CMD_QUEUE_NUM];
        struct iwl3945_queue *q = &txq->q;
        struct iwl3945_tfd_frame *tfd;
        u32 *control_flags;
        struct iwl3945_cmd *out_cmd;
        u32 idx;
        u16 fix_size = (u16)(cmd->len + sizeof(out_cmd->hdr));
        dma_addr_t phys_addr;
        int pad;
        u16 count;
        int ret;
        unsigned long flags;

        /* If any of the command structures end up being larger than
         * the TFD_MAX_PAYLOAD_SIZE, and it sent as a 'small' command then
         * we will need to increase the size of the TFD entries */
        BUG_ON((fix_size > TFD_MAX_PAYLOAD_SIZE) &&
               !(cmd->meta.flags & CMD_SIZE_HUGE));


        if (iwl3945_is_rfkill(priv)) {
                IWL_DEBUG_INFO("Not sending command - RF KILL");
                return -EIO;
        }

        if (iwl3945_queue_space(q) < ((cmd->meta.flags & CMD_ASYNC) ? 2 : 1)) {
                IWL_ERROR("No space for Tx\n");
                return -ENOSPC;
        }

        spin_lock_irqsave(&priv->hcmd_lock, flags);

        tfd = &txq->bd[q->write_ptr];
        memset(tfd, 0, sizeof(*tfd));

        control_flags = (u32 *) tfd;

        idx = get_cmd_index(q, q->write_ptr, cmd->meta.flags & CMD_SIZE_HUGE);
        out_cmd = &txq->cmd[idx];

        out_cmd->hdr.cmd = cmd->id;
        memcpy(&out_cmd->meta, &cmd->meta, sizeof(cmd->meta));
        memcpy(&out_cmd->cmd.payload, cmd->data, cmd->len);

        /* At this point, the out_cmd now has all of the incoming cmd
         * information */

        out_cmd->hdr.flags = 0;
        out_cmd->hdr.sequence = cpu_to_le16(QUEUE_TO_SEQ(IWL_CMD_QUEUE_NUM) |
                        INDEX_TO_SEQ(q->write_ptr));
        if (out_cmd->meta.flags & CMD_SIZE_HUGE)
                out_cmd->hdr.sequence |= cpu_to_le16(SEQ_HUGE_FRAME);

        phys_addr = txq->dma_addr_cmd + sizeof(txq->cmd[0]) * idx +
                        offsetof(struct iwl3945_cmd, hdr);
        iwl3945_hw_txq_attach_buf_to_tfd(priv, tfd, phys_addr, fix_size);

        pad = U32_PAD(cmd->len);
        count = TFD_CTL_COUNT_GET(*control_flags);
        *control_flags = TFD_CTL_COUNT_SET(count) | TFD_CTL_PAD_SET(pad);

        IWL_DEBUG_HC("Sending command %s (#%x), seq: 0x%04X, "
                     "%d bytes at %d[%d]:%d\n",
                     get_cmd_string(out_cmd->hdr.cmd),
                     out_cmd->hdr.cmd, le16_to_cpu(out_cmd->hdr.sequence),
                     fix_size, q->write_ptr, idx, IWL_CMD_QUEUE_NUM);

        txq->need_update = 1;

        /* Increment and update queue's write index */
        q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd);
        ret = iwl3945_tx_queue_update_write_ptr(priv, txq);

        spin_unlock_irqrestore(&priv->hcmd_lock, flags);
        return ret ? ret : idx;
}

static int iwl3945_send_cmd_async(struct iwl3945_priv *priv, struct iwl3945_host_cmd *cmd)
{
        int ret;

        BUG_ON(!(cmd->meta.flags & CMD_ASYNC));

        /* An asynchronous command can not expect an SKB to be set. */
        BUG_ON(cmd->meta.flags & CMD_WANT_SKB);

        /* An asynchronous command MUST have a callback. */
        BUG_ON(!cmd->meta.u.callback);

        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                return -EBUSY;

        ret = iwl3945_enqueue_hcmd(priv, cmd);
        if (ret < 0) {
                IWL_ERROR("Error sending %s: iwl3945_enqueue_hcmd failed: %d\n",
                          get_cmd_string(cmd->id), ret);
                return ret;
        }
        return 0;
}

static int iwl3945_send_cmd_sync(struct iwl3945_priv *priv, struct iwl3945_host_cmd *cmd)
{
        int cmd_idx;
        int ret;

        BUG_ON(cmd->meta.flags & CMD_ASYNC);

         /* A synchronous command can not have a callback set. */
        BUG_ON(cmd->meta.u.callback != NULL);

        if (test_and_set_bit(STATUS_HCMD_SYNC_ACTIVE, &priv->status)) {
                IWL_ERROR("Error sending %s: Already sending a host command\n",
                          get_cmd_string(cmd->id));
                ret = -EBUSY;
                goto out;
        }

        set_bit(STATUS_HCMD_ACTIVE, &priv->status);

        if (cmd->meta.flags & CMD_WANT_SKB)
                cmd->meta.source = &cmd->meta;

        cmd_idx = iwl3945_enqueue_hcmd(priv, cmd);
        if (cmd_idx < 0) {
                ret = cmd_idx;
                IWL_ERROR("Error sending %s: iwl3945_enqueue_hcmd failed: %d\n",
                          get_cmd_string(cmd->id), ret);
                goto out;
        }

        ret = wait_event_interruptible_timeout(priv->wait_command_queue,
                        !test_bit(STATUS_HCMD_ACTIVE, &priv->status),
                        HOST_COMPLETE_TIMEOUT);
        if (!ret) {
                if (test_bit(STATUS_HCMD_ACTIVE, &priv->status)) {
                        IWL_ERROR("Error sending %s: time out after %dms.\n",
                                  get_cmd_string(cmd->id),
                                  jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));

                        clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
                        ret = -ETIMEDOUT;
                        goto cancel;
                }
        }

        if (test_bit(STATUS_RF_KILL_HW, &priv->status)) {
                IWL_DEBUG_INFO("Command %s aborted: RF KILL Switch\n",
                               get_cmd_string(cmd->id));
                ret = -ECANCELED;
                goto fail;
        }
        if (test_bit(STATUS_FW_ERROR, &priv->status)) {
                IWL_DEBUG_INFO("Command %s failed: FW Error\n",
                               get_cmd_string(cmd->id));
                ret = -EIO;
                goto fail;
        }
        if ((cmd->meta.flags & CMD_WANT_SKB) && !cmd->meta.u.skb) {
                IWL_ERROR("Error: Response NULL in '%s'\n",
                          get_cmd_string(cmd->id));
                ret = -EIO;
                goto out;
        }

        ret = 0;
        goto out;

cancel:
        if (cmd->meta.flags & CMD_WANT_SKB) {
                struct iwl3945_cmd *qcmd;

                /* Cancel the CMD_WANT_SKB flag for the cmd in the
                 * TX cmd queue. Otherwise in case the cmd comes
                 * in later, it will possibly set an invalid
                 * address (cmd->meta.source). */
                qcmd = &priv->txq[IWL_CMD_QUEUE_NUM].cmd[cmd_idx];
                qcmd->meta.flags &= ~CMD_WANT_SKB;
        }
fail:
        if (cmd->meta.u.skb) {
                dev_kfree_skb_any(cmd->meta.u.skb);
                cmd->meta.u.skb = NULL;
        }
out:
        clear_bit(STATUS_HCMD_SYNC_ACTIVE, &priv->status);
        return ret;
}

int iwl3945_send_cmd(struct iwl3945_priv *priv, struct iwl3945_host_cmd *cmd)
{
        if (cmd->meta.flags & CMD_ASYNC)
                return iwl3945_send_cmd_async(priv, cmd);

        return iwl3945_send_cmd_sync(priv, cmd);
}

int iwl3945_send_cmd_pdu(struct iwl3945_priv *priv, u8 id, u16 len, const void *data)
{
        struct iwl3945_host_cmd cmd = {
                .id = id,
                .len = len,
                .data = data,
        };

        return iwl3945_send_cmd_sync(priv, &cmd);
}

static int __must_check iwl3945_send_cmd_u32(struct iwl3945_priv *priv, u8 id, u32 val)
{
        struct iwl3945_host_cmd cmd = {
                .id = id,
                .len = sizeof(val),
                .data = &val,
        };

        return iwl3945_send_cmd_sync(priv, &cmd);
}

int iwl3945_send_statistics_request(struct iwl3945_priv *priv)
{
        return iwl3945_send_cmd_u32(priv, REPLY_STATISTICS_CMD, 0);
}

/**
 * iwl3945_set_rxon_channel - Set the phymode and channel values in staging RXON
 * @band: 2.4 or 5 GHz band
 * @channel: Any channel valid for the requested band

 * In addition to setting the staging RXON, priv->band is also set.
 *
 * NOTE:  Does not commit to the hardware; it sets appropriate bit fields
 * in the staging RXON flag structure based on the band
 */
static int iwl3945_set_rxon_channel(struct iwl3945_priv *priv,
                                    enum ieee80211_band band,
                                    u16 channel)
{
        if (!iwl3945_get_channel_info(priv, band, channel)) {
                IWL_DEBUG_INFO("Could not set channel to %d [%d]\n",
                               channel, band);
                return -EINVAL;
        }

        if ((le16_to_cpu(priv->staging_rxon.channel) == channel) &&
            (priv->band == band))
                return 0;

        priv->staging_rxon.channel = cpu_to_le16(channel);
        if (band == IEEE80211_BAND_5GHZ)
                priv->staging_rxon.flags &= ~RXON_FLG_BAND_24G_MSK;
        else
                priv->staging_rxon.flags |= RXON_FLG_BAND_24G_MSK;

        priv->band = band;

        IWL_DEBUG_INFO("Staging channel set to %d [%d]\n", channel, band);

        return 0;
}

/**
 * iwl3945_check_rxon_cmd - validate RXON structure is valid
 *
 * NOTE:  This is really only useful during development and can eventually
 * be #ifdef'd out once the driver is stable and folks aren't actively
 * making changes
 */
static int iwl3945_check_rxon_cmd(struct iwl3945_rxon_cmd *rxon)
{
        int error = 0;
        int counter = 1;

        if (rxon->flags & RXON_FLG_BAND_24G_MSK) {
                error |= le32_to_cpu(rxon->flags &
                                (RXON_FLG_TGJ_NARROW_BAND_MSK |
                                 RXON_FLG_RADAR_DETECT_MSK));
                if (error)
                        IWL_WARNING("check 24G fields %d | %d\n",
                                    counter++, error);
        } else {
                error |= (rxon->flags & RXON_FLG_SHORT_SLOT_MSK) ?
                                0 : le32_to_cpu(RXON_FLG_SHORT_SLOT_MSK);
                if (error)
                        IWL_WARNING("check 52 fields %d | %d\n",
                                    counter++, error);
                error |= le32_to_cpu(rxon->flags & RXON_FLG_CCK_MSK);
                if (error)
                        IWL_WARNING("check 52 CCK %d | %d\n",
                                    counter++, error);
        }
        error |= (rxon->node_addr[0] | rxon->bssid_addr[0]) & 0x1;
        if (error)
                IWL_WARNING("check mac addr %d | %d\n", counter++, error);

        /* make sure basic rates 6Mbps and 1Mbps are supported */
        error |= (((rxon->ofdm_basic_rates & IWL_RATE_6M_MASK) == 0) &&
                  ((rxon->cck_basic_rates & IWL_RATE_1M_MASK) == 0));
        if (error)
                IWL_WARNING("check basic rate %d | %d\n", counter++, error);

        error |= (le16_to_cpu(rxon->assoc_id) > 2007);
        if (error)
                IWL_WARNING("check assoc id %d | %d\n", counter++, error);

        error |= ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK))
                        == (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK));
        if (error)
                IWL_WARNING("check CCK and short slot %d | %d\n",
                            counter++, error);

        error |= ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK))
                        == (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK));
        if (error)
                IWL_WARNING("check CCK & auto detect %d | %d\n",
                            counter++, error);

        error |= ((rxon->flags & (RXON_FLG_AUTO_DETECT_MSK |
                        RXON_FLG_TGG_PROTECT_MSK)) == RXON_FLG_TGG_PROTECT_MSK);
        if (error)
                IWL_WARNING("check TGG and auto detect %d | %d\n",
                            counter++, error);

        if ((rxon->flags & RXON_FLG_DIS_DIV_MSK))
                error |= ((rxon->flags & (RXON_FLG_ANT_B_MSK |
                                RXON_FLG_ANT_A_MSK)) == 0);
        if (error)
                IWL_WARNING("check antenna %d %d\n", counter++, error);

        if (error)
                IWL_WARNING("Tuning to channel %d\n",
                            le16_to_cpu(rxon->channel));

        if (error) {
                IWL_ERROR("Not a valid iwl3945_rxon_assoc_cmd field values\n");
                return -1;
        }
        return 0;
}

/**
 * iwl3945_full_rxon_required - check if full RXON (vs RXON_ASSOC) cmd is needed
 * @priv: staging_rxon is compared to active_rxon
 *
 * If the RXON structure is changing enough to require a new tune,
 * or is clearing the RXON_FILTER_ASSOC_MSK, then return 1 to indicate that
 * a new tune (full RXON command, rather than RXON_ASSOC cmd) is required.
 */
static int iwl3945_full_rxon_required(struct iwl3945_priv *priv)
{

        /* These items are only settable from the full RXON command */
        if (!(iwl3945_is_associated(priv)) ||
            compare_ether_addr(priv->staging_rxon.bssid_addr,
                               priv->active_rxon.bssid_addr) ||
            compare_ether_addr(priv->staging_rxon.node_addr,
                               priv->active_rxon.node_addr) ||
            compare_ether_addr(priv->staging_rxon.wlap_bssid_addr,
                               priv->active_rxon.wlap_bssid_addr) ||
            (priv->staging_rxon.dev_type != priv->active_rxon.dev_type) ||
            (priv->staging_rxon.channel != priv->active_rxon.channel) ||
            (priv->staging_rxon.air_propagation !=
             priv->active_rxon.air_propagation) ||
            (priv->staging_rxon.assoc_id != priv->active_rxon.assoc_id))
                return 1;

        /* flags, filter_flags, ofdm_basic_rates, and cck_basic_rates can
         * be updated with the RXON_ASSOC command -- however only some
         * flag transitions are allowed using RXON_ASSOC */

        /* Check if we are not switching bands */
        if ((priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK) !=
            (priv->active_rxon.flags & RXON_FLG_BAND_24G_MSK))
                return 1;

        /* Check if we are switching association toggle */
        if ((priv->staging_rxon.filter_flags & RXON_FILTER_ASSOC_MSK) !=
                (priv->active_rxon.filter_flags & RXON_FILTER_ASSOC_MSK))
                return 1;

        return 0;
}

static int iwl3945_send_rxon_assoc(struct iwl3945_priv *priv)
{
        int rc = 0;
        struct iwl3945_rx_packet *res = NULL;
        struct iwl3945_rxon_assoc_cmd rxon_assoc;
        struct iwl3945_host_cmd cmd = {
                .id = REPLY_RXON_ASSOC,
                .len = sizeof(rxon_assoc),
                .meta.flags = CMD_WANT_SKB,
                .data = &rxon_assoc,
        };
        const struct iwl3945_rxon_cmd *rxon1 = &priv->staging_rxon;
        const struct iwl3945_rxon_cmd *rxon2 = &priv->active_rxon;

        if ((rxon1->flags == rxon2->flags) &&
            (rxon1->filter_flags == rxon2->filter_flags) &&
            (rxon1->cck_basic_rates == rxon2->cck_basic_rates) &&
            (rxon1->ofdm_basic_rates == rxon2->ofdm_basic_rates)) {
                IWL_DEBUG_INFO("Using current RXON_ASSOC.  Not resending.\n");
                return 0;
        }

        rxon_assoc.flags = priv->staging_rxon.flags;
        rxon_assoc.filter_flags = priv->staging_rxon.filter_flags;
        rxon_assoc.ofdm_basic_rates = priv->staging_rxon.ofdm_basic_rates;
        rxon_assoc.cck_basic_rates = priv->staging_rxon.cck_basic_rates;
        rxon_assoc.reserved = 0;

        rc = iwl3945_send_cmd_sync(priv, &cmd);
        if (rc)
                return rc;

        res = (struct iwl3945_rx_packet *)cmd.meta.u.skb->data;
        if (res->hdr.flags & IWL_CMD_FAILED_MSK) {
                IWL_ERROR("Bad return from REPLY_RXON_ASSOC command\n");
                rc = -EIO;
        }

        priv->alloc_rxb_skb--;
        dev_kfree_skb_any(cmd.meta.u.skb);

        return rc;
}

/**
 * iwl3945_commit_rxon - commit staging_rxon to hardware
 *
 * The RXON command in staging_rxon is committed to the hardware and
 * the active_rxon structure is updated with the new data.  This
 * function correctly transitions out of the RXON_ASSOC_MSK state if
 * a HW tune is required based on the RXON structure changes.
 */
static int iwl3945_commit_rxon(struct iwl3945_priv *priv)
{
        /* cast away the const for active_rxon in this function */
        struct iwl3945_rxon_cmd *active_rxon = (void *)&priv->active_rxon;
        int rc = 0;

        if (!iwl3945_is_alive(priv))
                return -1;

        /* always get timestamp with Rx frame */
        priv->staging_rxon.flags |= RXON_FLG_TSF2HOST_MSK;

        /* select antenna */
        priv->staging_rxon.flags &=
            ~(RXON_FLG_DIS_DIV_MSK | RXON_FLG_ANT_SEL_MSK);
        priv->staging_rxon.flags |= iwl3945_get_antenna_flags(priv);

        rc = iwl3945_check_rxon_cmd(&priv->staging_rxon);
        if (rc) {
                IWL_ERROR("Invalid RXON configuration.  Not committing.\n");
                return -EINVAL;
        }

        /* If we don't need to send a full RXON, we can use
         * iwl3945_rxon_assoc_cmd which is used to reconfigure filter
         * and other flags for the current radio configuration. */
        if (!iwl3945_full_rxon_required(priv)) {
                rc = iwl3945_send_rxon_assoc(priv);
                if (rc) {
                        IWL_ERROR("Error setting RXON_ASSOC "
                                  "configuration (%d).\n", rc);
                        return rc;
                }

                memcpy(active_rxon, &priv->staging_rxon, sizeof(*active_rxon));

                return 0;
        }

        /* If we are currently associated and the new config requires
         * an RXON_ASSOC and the new config wants the associated mask enabled,
         * we must clear the associated from the active configuration
         * before we apply the new config */
        if (iwl3945_is_associated(priv) &&
            (priv->staging_rxon.filter_flags & RXON_FILTER_ASSOC_MSK)) {
                IWL_DEBUG_INFO("Toggling associated bit on current RXON\n");
                active_rxon->filter_flags &= ~RXON_FILTER_ASSOC_MSK;

                rc = iwl3945_send_cmd_pdu(priv, REPLY_RXON,
                                      sizeof(struct iwl3945_rxon_cmd),
                                      &priv->active_rxon);

                /* If the mask clearing failed then we set
                 * active_rxon back to what it was previously */
                if (rc) {
                        active_rxon->filter_flags |= RXON_FILTER_ASSOC_MSK;
                        IWL_ERROR("Error clearing ASSOC_MSK on current "
                                  "configuration (%d).\n", rc);
                        return rc;
                }
        }

        IWL_DEBUG_INFO("Sending RXON\n"
                       "* with%s RXON_FILTER_ASSOC_MSK\n"
                       "* channel = %d\n"
                       "* bssid = %pM\n",
                       ((priv->staging_rxon.filter_flags &
                         RXON_FILTER_ASSOC_MSK) ? "" : "out"),
                       le16_to_cpu(priv->staging_rxon.channel),
                       priv->staging_rxon.bssid_addr);

        /* Apply the new configuration */
        rc = iwl3945_send_cmd_pdu(priv, REPLY_RXON,
                              sizeof(struct iwl3945_rxon_cmd), &priv->staging_rxon);
        if (rc) {
                IWL_ERROR("Error setting new configuration (%d).\n", rc);
                return rc;
        }

        memcpy(active_rxon, &priv->staging_rxon, sizeof(*active_rxon));

        iwl3945_clear_stations_table(priv);

        /* If we issue a new RXON command which required a tune then we must
         * send a new TXPOWER command or we won't be able to Tx any frames */
        rc = iwl3945_hw_reg_send_txpower(priv);
        if (rc) {
                IWL_ERROR("Error setting Tx power (%d).\n", rc);
                return rc;
        }

        /* Add the broadcast address so we can send broadcast frames */
        if (iwl3945_add_station(priv, iwl3945_broadcast_addr, 0, 0) ==
            IWL_INVALID_STATION) {
                IWL_ERROR("Error adding BROADCAST address for transmit.\n");
                return -EIO;
        }

        /* If we have set the ASSOC_MSK and we are in BSS mode then
         * add the IWL_AP_ID to the station rate table */
        if (iwl3945_is_associated(priv) &&
            (priv->iw_mode == NL80211_IFTYPE_STATION))
                if (iwl3945_add_station(priv, priv->active_rxon.bssid_addr, 1, 0)
                    == IWL_INVALID_STATION) {
                        IWL_ERROR("Error adding AP address for transmit.\n");
                        return -EIO;
                }

        /* Init the hardware's rate fallback order based on the band */
        rc = iwl3945_init_hw_rate_table(priv);
        if (rc) {
                IWL_ERROR("Error setting HW rate table: %02X\n", rc);
                return -EIO;
        }

        return 0;
}

static int iwl3945_send_bt_config(struct iwl3945_priv *priv)
{
        struct iwl3945_bt_cmd bt_cmd = {
                .flags = 3,
                .lead_time = 0xAA,
                .max_kill = 1,
                .kill_ack_mask = 0,
                .kill_cts_mask = 0,
        };

        return iwl3945_send_cmd_pdu(priv, REPLY_BT_CONFIG,
                                sizeof(struct iwl3945_bt_cmd), &bt_cmd);
}

static int iwl3945_send_scan_abort(struct iwl3945_priv *priv)
{
        int rc = 0;
        struct iwl3945_rx_packet *res;
        struct iwl3945_host_cmd cmd = {
                .id = REPLY_SCAN_ABORT_CMD,
                .meta.flags = CMD_WANT_SKB,
        };

        /* If there isn't a scan actively going on in the hardware
         * then we are in between scan bands and not actually
         * actively scanning, so don't send the abort command */
        if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
                clear_bit(STATUS_SCAN_ABORTING, &priv->status);
                return 0;
        }

        rc = iwl3945_send_cmd_sync(priv, &cmd);
        if (rc) {
                clear_bit(STATUS_SCAN_ABORTING, &priv->status);
                return rc;
        }

        res = (struct iwl3945_rx_packet *)cmd.meta.u.skb->data;
        if (res->u.status != CAN_ABORT_STATUS) {
                /* The scan abort will return 1 for success or
                 * 2 for "failure".  A failure condition can be
                 * due to simply not being in an active scan which
                 * can occur if we send the scan abort before we
                 * the microcode has notified us that a scan is
                 * completed. */
                IWL_DEBUG_INFO("SCAN_ABORT returned %d.\n", res->u.status);
                clear_bit(STATUS_SCAN_ABORTING, &priv->status);
                clear_bit(STATUS_SCAN_HW, &priv->status);
        }

        dev_kfree_skb_any(cmd.meta.u.skb);

        return rc;
}

static int iwl3945_card_state_sync_callback(struct iwl3945_priv *priv,
                                        struct iwl3945_cmd *cmd,
                                        struct sk_buff *skb)
{
        return 1;
}

/*
 * CARD_STATE_CMD
 *
 * Use: Sets the device's internal card state to enable, disable, or halt
 *
 * When in the 'enable' state the card operates as normal.
 * When in the 'disable' state, the card enters into a low power mode.
 * When in the 'halt' state, the card is shut down and must be fully
 * restarted to come back on.
 */
static int iwl3945_send_card_state(struct iwl3945_priv *priv, u32 flags, u8 meta_flag)
{
        struct iwl3945_host_cmd cmd = {
                .id = REPLY_CARD_STATE_CMD,
                .len = sizeof(u32),
                .data = &flags,
                .meta.flags = meta_flag,
        };

        if (meta_flag & CMD_ASYNC)
                cmd.meta.u.callback = iwl3945_card_state_sync_callback;

        return iwl3945_send_cmd(priv, &cmd);
}

static int iwl3945_add_sta_sync_callback(struct iwl3945_priv *priv,
                                     struct iwl3945_cmd *cmd, struct sk_buff *skb)
{
        struct iwl3945_rx_packet *res = NULL;

        if (!skb) {
                IWL_ERROR("Error: Response NULL in REPLY_ADD_STA.\n");
                return 1;
        }

        res = (struct iwl3945_rx_packet *)skb->data;
        if (res->hdr.flags & IWL_CMD_FAILED_MSK) {
                IWL_ERROR("Bad return from REPLY_ADD_STA (0x%08X)\n",
                          res->hdr.flags);
                return 1;
        }

        switch (res->u.add_sta.status) {
        case ADD_STA_SUCCESS_MSK:
                break;
        default:
                break;
        }

        /* We didn't cache the SKB; let the caller free it */
        return 1;
}

int iwl3945_send_add_station(struct iwl3945_priv *priv,
                         struct iwl3945_addsta_cmd *sta, u8 flags)
{
        struct iwl3945_rx_packet *res = NULL;
        int rc = 0;
        struct iwl3945_host_cmd cmd = {
                .id = REPLY_ADD_STA,
                .len = sizeof(struct iwl3945_addsta_cmd),
                .meta.flags = flags,
                .data = sta,
        };

        if (flags & CMD_ASYNC)
                cmd.meta.u.callback = iwl3945_add_sta_sync_callback;
        else
                cmd.meta.flags |= CMD_WANT_SKB;

        rc = iwl3945_send_cmd(priv, &cmd);

        if (rc || (flags & CMD_ASYNC))
                return rc;

        res = (struct iwl3945_rx_packet *)cmd.meta.u.skb->data;
        if (res->hdr.flags & IWL_CMD_FAILED_MSK) {
                IWL_ERROR("Bad return from REPLY_ADD_STA (0x%08X)\n",
                          res->hdr.flags);
                rc = -EIO;
        }

        if (rc == 0) {
                switch (res->u.add_sta.status) {
                case ADD_STA_SUCCESS_MSK:
                        IWL_DEBUG_INFO("REPLY_ADD_STA PASSED\n");
                        break;
                default:
                        rc = -EIO;
                        IWL_WARNING("REPLY_ADD_STA failed\n");
                        break;
                }
        }

        priv->alloc_rxb_skb--;
        dev_kfree_skb_any(cmd.meta.u.skb);

        return rc;
}

static int iwl3945_update_sta_key_info(struct iwl3945_priv *priv,
                                   struct ieee80211_key_conf *keyconf,
                                   u8 sta_id)
{
        unsigned long flags;
        __le16 key_flags = 0;

        switch (keyconf->alg) {
        case ALG_CCMP:
                key_flags |= STA_KEY_FLG_CCMP;
                key_flags |= cpu_to_le16(
                                keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
                key_flags &= ~STA_KEY_FLG_INVALID;
                break;
        case ALG_TKIP:
        case ALG_WEP:
        default:
                return -EINVAL;
        }
        spin_lock_irqsave(&priv->sta_lock, flags);
        priv->stations[sta_id].keyinfo.alg = keyconf->alg;
        priv->stations[sta_id].keyinfo.keylen = keyconf->keylen;
        memcpy(priv->stations[sta_id].keyinfo.key, keyconf->key,
               keyconf->keylen);

        memcpy(priv->stations[sta_id].sta.key.key, keyconf->key,
               keyconf->keylen);
        priv->stations[sta_id].sta.key.key_flags = key_flags;
        priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
        priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;

        spin_unlock_irqrestore(&priv->sta_lock, flags);

        IWL_DEBUG_INFO("hwcrypto: modify ucode station key info\n");
        iwl3945_send_add_station(priv, &priv->stations[sta_id].sta, 0);
        return 0;
}

static int iwl3945_clear_sta_key_info(struct iwl3945_priv *priv, u8 sta_id)
{
        unsigned long flags;

        spin_lock_irqsave(&priv->sta_lock, flags);
        memset(&priv->stations[sta_id].keyinfo, 0, sizeof(struct iwl3945_hw_key));
        memset(&priv->stations[sta_id].sta.key, 0, sizeof(struct iwl3945_keyinfo));
        priv->stations[sta_id].sta.key.key_flags = STA_KEY_FLG_NO_ENC;
        priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
        priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
        spin_unlock_irqrestore(&priv->sta_lock, flags);

        IWL_DEBUG_INFO("hwcrypto: clear ucode station key info\n");
        iwl3945_send_add_station(priv, &priv->stations[sta_id].sta, 0);
        return 0;
}

static void iwl3945_clear_free_frames(struct iwl3945_priv *priv)
{
        struct list_head *element;

        IWL_DEBUG_INFO("%d frames on pre-allocated heap on clear.\n",
                       priv->frames_count);

        while (!list_empty(&priv->free_frames)) {
                element = priv->free_frames.next;
                list_del(element);
                kfree(list_entry(element, struct iwl3945_frame, list));
                priv->frames_count--;
        }

        if (priv->frames_count) {
                IWL_WARNING("%d frames still in use.  Did we lose one?\n",
                            priv->frames_count);
                priv->frames_count = 0;
        }
}

static struct iwl3945_frame *iwl3945_get_free_frame(struct iwl3945_priv *priv)
{
        struct iwl3945_frame *frame;
        struct list_head *element;
        if (list_empty(&priv->free_frames)) {
                frame = kzalloc(sizeof(*frame), GFP_KERNEL);
                if (!frame) {
                        IWL_ERROR("Could not allocate frame!\n");
                        return NULL;
                }

                priv->frames_count++;
                return frame;
        }

        element = priv->free_frames.next;
        list_del(element);
        return list_entry(element, struct iwl3945_frame, list);
}

static void iwl3945_free_frame(struct iwl3945_priv *priv, struct iwl3945_frame *frame)
{
        memset(frame, 0, sizeof(*frame));
        list_add(&frame->list, &priv->free_frames);
}

unsigned int iwl3945_fill_beacon_frame(struct iwl3945_priv *priv,
                                struct ieee80211_hdr *hdr,
                                const u8 *dest, int left)
{

        if (!iwl3945_is_associated(priv) || !priv->ibss_beacon ||
            ((priv->iw_mode != NL80211_IFTYPE_ADHOC) &&
             (priv->iw_mode != NL80211_IFTYPE_AP)))
                return 0;

        if (priv->ibss_beacon->len > left)
                return 0;

        memcpy(hdr, priv->ibss_beacon->data, priv->ibss_beacon->len);

        return priv->ibss_beacon->len;
}

static u8 iwl3945_rate_get_lowest_plcp(struct iwl3945_priv *priv)
{
        u8 i;
        int rate_mask;

        /* Set rate mask*/
        if (priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK)
                rate_mask = priv->active_rate_basic & IWL_CCK_RATES_MASK;
        else
                rate_mask = priv->active_rate_basic & IWL_OFDM_RATES_MASK;

        for (i = IWL_RATE_1M_INDEX; i != IWL_RATE_INVALID;
             i = iwl3945_rates[i].next_ieee) {
                if (rate_mask & (1 << i))
                        return iwl3945_rates[i].plcp;
        }

        /* No valid rate was found. Assign the lowest one */
        if (priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK)
                return IWL_RATE_1M_PLCP;
        else
                return IWL_RATE_6M_PLCP;
}

static int iwl3945_send_beacon_cmd(struct iwl3945_priv *priv)
{
        struct iwl3945_frame *frame;
        unsigned int frame_size;
        int rc;
        u8 rate;

        frame = iwl3945_get_free_frame(priv);

        if (!frame) {
                IWL_ERROR("Could not obtain free frame buffer for beacon "
                          "command.\n");
                return -ENOMEM;
        }

        rate = iwl3945_rate_get_lowest_plcp(priv);

        frame_size = iwl3945_hw_get_beacon_cmd(priv, frame, rate);

        rc = iwl3945_send_cmd_pdu(priv, REPLY_TX_BEACON, frame_size,
                              &frame->u.cmd[0]);

        iwl3945_free_frame(priv, frame);

        return rc;
}

/******************************************************************************
 *
 * EEPROM related functions
 *
 ******************************************************************************/

static void get_eeprom_mac(struct iwl3945_priv *priv, u8 *mac)
{
        memcpy(mac, priv->eeprom.mac_address, 6);
}

/*
 * Clear the OWNER_MSK, to establish driver (instead of uCode running on
 * embedded controller) as EEPROM reader; each read is a series of pulses
 * to/from the EEPROM chip, not a single event, so even reads could conflict
 * if they weren't arbitrated by some ownership mechanism.  Here, the driver
 * simply claims ownership, which should be safe when this function is called
 * (i.e. before loading uCode!).
 */
static inline int iwl3945_eeprom_acquire_semaphore(struct iwl3945_priv *priv)
{
        _iwl3945_clear_bit(priv, CSR_EEPROM_GP, CSR_EEPROM_GP_IF_OWNER_MSK);
        return 0;
}

/**
 * iwl3945_eeprom_init - read EEPROM contents
 *
 * Load the EEPROM contents from adapter into priv->eeprom
 *
 * NOTE:  This routine uses the non-debug IO access functions.
 */
int iwl3945_eeprom_init(struct iwl3945_priv *priv)
{
        u16 *e = (u16 *)&priv->eeprom;
        u32 gp = iwl3945_read32(priv, CSR_EEPROM_GP);
        u32 r;
        int sz = sizeof(priv->eeprom);
        int rc;
        int i;
        u16 addr;

        /* The EEPROM structure has several padding buffers within it
         * and when adding new EEPROM maps is subject to programmer errors
         * which may be very difficult to identify without explicitly
         * checking the resulting size of the eeprom map. */
        BUILD_BUG_ON(sizeof(priv->eeprom) != IWL_EEPROM_IMAGE_SIZE);

        if ((gp & CSR_EEPROM_GP_VALID_MSK) == CSR_EEPROM_GP_BAD_SIGNATURE) {
                IWL_ERROR("EEPROM not found, EEPROM_GP=0x%08x\n", gp);
                return -ENOENT;
        }

        /* Make sure driver (instead of uCode) is allowed to read EEPROM */
        rc = iwl3945_eeprom_acquire_semaphore(priv);
        if (rc < 0) {
                IWL_ERROR("Failed to acquire EEPROM semaphore.\n");
                return -ENOENT;
        }

        /* eeprom is an array of 16bit values */
        for (addr = 0; addr < sz; addr += sizeof(u16)) {
                _iwl3945_write32(priv, CSR_EEPROM_REG, addr << 1);
                _iwl3945_clear_bit(priv, CSR_EEPROM_REG, CSR_EEPROM_REG_BIT_CMD);

                for (i = 0; i < IWL_EEPROM_ACCESS_TIMEOUT;
                                        i += IWL_EEPROM_ACCESS_DELAY) {
                        r = _iwl3945_read_direct32(priv, CSR_EEPROM_REG);
                        if (r & CSR_EEPROM_REG_READ_VALID_MSK)
                                break;
                        udelay(IWL_EEPROM_ACCESS_DELAY);
                }

                if (!(r & CSR_EEPROM_REG_READ_VALID_MSK)) {
                        IWL_ERROR("Time out reading EEPROM[%d]\n", addr);
                        return -ETIMEDOUT;
                }
                e[addr / 2] = le16_to_cpu((__force __le16)(r >> 16));
        }

        return 0;
}

static void iwl3945_unset_hw_setting(struct iwl3945_priv *priv)
{
        if (priv->hw_setting.shared_virt)
                pci_free_consistent(priv->pci_dev,
                                    sizeof(struct iwl3945_shared),
                                    priv->hw_setting.shared_virt,
                                    priv->hw_setting.shared_phys);
}

/**
 * iwl3945_supported_rate_to_ie - fill in the supported rate in IE field
 *
 * return : set the bit for each supported rate insert in ie
 */
static u16 iwl3945_supported_rate_to_ie(u8 *ie, u16 supported_rate,
                                    u16 basic_rate, int *left)
{
        u16 ret_rates = 0, bit;
        int i;
        u8 *cnt = ie;
        u8 *rates = ie + 1;

        for (bit = 1, i = 0; i < IWL_RATE_COUNT; i++, bit <<= 1) {
                if (bit & supported_rate) {
                        ret_rates |= bit;
                        rates[*cnt] = iwl3945_rates[i].ieee |
                                ((bit & basic_rate) ? 0x80 : 0x00);
                        (*cnt)++;
                        (*left)--;
                        if ((*left <= 0) ||
                            (*cnt >= IWL_SUPPORTED_RATES_IE_LEN))
                                break;
                }
        }

        return ret_rates;
}

/**
 * iwl3945_fill_probe_req - fill in all required fields and IE for probe request
 */
static u16 iwl3945_fill_probe_req(struct iwl3945_priv *priv,
                              struct ieee80211_mgmt *frame,
                              int left)
{
        int len = 0;
        u8 *pos = NULL;
        u16 active_rates, ret_rates, cck_rates;

        /* Make sure there is enough space for the probe request,
         * two mandatory IEs and the data */
        left -= 24;
        if (left < 0)
                return 0;
        len += 24;

        frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
        memcpy(frame->da, iwl3945_broadcast_addr, ETH_ALEN);
        memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
        memcpy(frame->bssid, iwl3945_broadcast_addr, ETH_ALEN);
        frame->seq_ctrl = 0;

        /* fill in our indirect SSID IE */
        /* ...next IE... */

        left -= 2;
        if (left < 0)
                return 0;
        len += 2;
        pos = &(frame->u.probe_req.variable[0]);
        *pos++ = WLAN_EID_SSID;
        *pos++ = 0;

        /* fill in supported rate */
        /* ...next IE... */
        left -= 2;
        if (left < 0)
                return 0;

        /* ... fill it in... */
        *pos++ = WLAN_EID_SUPP_RATES;
        *pos = 0;

        priv->active_rate = priv->rates_mask;
        active_rates = priv->active_rate;
        priv->active_rate_basic = priv->rates_mask & IWL_BASIC_RATES_MASK;

        cck_rates = IWL_CCK_RATES_MASK & active_rates;
        ret_rates = iwl3945_supported_rate_to_ie(pos, cck_rates,
                        priv->active_rate_basic, &left);
        active_rates &= ~ret_rates;

        ret_rates = iwl3945_supported_rate_to_ie(pos, active_rates,
                                 priv->active_rate_basic, &left);
        active_rates &= ~ret_rates;

        len += 2 + *pos;
        pos += (*pos) + 1;
        if (active_rates == 0)
                goto fill_end;

        /* fill in supported extended rate */
        /* ...next IE... */
        left -= 2;
        if (left < 0)
                return 0;
        /* ... fill it in... */
        *pos++ = WLAN_EID_EXT_SUPP_RATES;
        *pos = 0;
        iwl3945_supported_rate_to_ie(pos, active_rates,
                                 priv->active_rate_basic, &left);
        if (*pos > 0)
                len += 2 + *pos;

 fill_end:
        return (u16)len;
}

/*
 * QoS  support
*/
static int iwl3945_send_qos_params_command(struct iwl3945_priv *priv,
                                       struct iwl3945_qosparam_cmd *qos)
{

        return iwl3945_send_cmd_pdu(priv, REPLY_QOS_PARAM,
                                sizeof(struct iwl3945_qosparam_cmd), qos);
}

static void iwl3945_reset_qos(struct iwl3945_priv *priv)
{
        u16 cw_min = 15;
        u16 cw_max = 1023;
        u8 aifs = 2;
        u8 is_legacy = 0;
        unsigned long flags;
        int i;

        spin_lock_irqsave(&priv->lock, flags);
        priv->qos_data.qos_active = 0;

        if (priv->iw_mode == NL80211_IFTYPE_ADHOC) {
                if (priv->qos_data.qos_enable)
                        priv->qos_data.qos_active = 1;
                if (!(priv->active_rate & 0xfff0)) {
                        cw_min = 31;
                        is_legacy = 1;
                }
        } else if (priv->iw_mode == NL80211_IFTYPE_AP) {
                if (priv->qos_data.qos_enable)
                        priv->qos_data.qos_active = 1;
        } else if (!(priv->staging_rxon.flags & RXON_FLG_SHORT_SLOT_MSK)) {
                cw_min = 31;
                is_legacy = 1;
        }

        if (priv->qos_data.qos_active)
                aifs = 3;

        priv->qos_data.def_qos_parm.ac[0].cw_min = cpu_to_le16(cw_min);
        priv->qos_data.def_qos_parm.ac[0].cw_max = cpu_to_le16(cw_max);
        priv->qos_data.def_qos_parm.ac[0].aifsn = aifs;
        priv->qos_data.def_qos_parm.ac[0].edca_txop = 0;
        priv->qos_data.def_qos_parm.ac[0].reserved1 = 0;

        if (priv->qos_data.qos_active) {
                i = 1;
                priv->qos_data.def_qos_parm.ac[i].cw_min = cpu_to_le16(cw_min);
                priv->qos_data.def_qos_parm.ac[i].cw_max = cpu_to_le16(cw_max);
                priv->qos_data.def_qos_parm.ac[i].aifsn = 7;
                priv->qos_data.def_qos_parm.ac[i].edca_txop = 0;
                priv->qos_data.def_qos_parm.ac[i].reserved1 = 0;

                i = 2;
                priv->qos_data.def_qos_parm.ac[i].cw_min =
                        cpu_to_le16((cw_min + 1) / 2 - 1);
                priv->qos_data.def_qos_parm.ac[i].cw_max =
                        cpu_to_le16(cw_max);
                priv->qos_data.def_qos_parm.ac[i].aifsn = 2;
                if (is_legacy)
                        priv->qos_data.def_qos_parm.ac[i].edca_txop =
                                cpu_to_le16(6016);
                else
                        priv->qos_data.def_qos_parm.ac[i].edca_txop =
                                cpu_to_le16(3008);
                priv->qos_data.def_qos_parm.ac[i].reserved1 = 0;

                i = 3;
                priv->qos_data.def_qos_parm.ac[i].cw_min =
                        cpu_to_le16((cw_min + 1) / 4 - 1);
                priv->qos_data.def_qos_parm.ac[i].cw_max =
                        cpu_to_le16((cw_max + 1) / 2 - 1);
                priv->qos_data.def_qos_parm.ac[i].aifsn = 2;
                priv->qos_data.def_qos_parm.ac[i].reserved1 = 0;
                if (is_legacy)
                        priv->qos_data.def_qos_parm.ac[i].edca_txop =
                                cpu_to_le16(3264);
                else
                        priv->qos_data.def_qos_parm.ac[i].edca_txop =
                                cpu_to_le16(1504);
        } else {
                for (i = 1; i < 4; i++) {
                        priv->qos_data.def_qos_parm.ac[i].cw_min =
                                cpu_to_le16(cw_min);
                        priv->qos_data.def_qos_parm.ac[i].cw_max =
                                cpu_to_le16(cw_max);
                        priv->qos_data.def_qos_parm.ac[i].aifsn = aifs;
                        priv->qos_data.def_qos_parm.ac[i].edca_txop = 0;
                        priv->qos_data.def_qos_parm.ac[i].reserved1 = 0;
                }
        }
        IWL_DEBUG_QOS("set QoS to default \n");

        spin_unlock_irqrestore(&priv->lock, flags);
}

static void iwl3945_activate_qos(struct iwl3945_priv *priv, u8 force)
{
        unsigned long flags;

        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                return;

        if (!priv->qos_data.qos_enable)
                return;

        spin_lock_irqsave(&priv->lock, flags);
        priv->qos_data.def_qos_parm.qos_flags = 0;

        if (priv->qos_data.qos_cap.q_AP.queue_request &&
            !priv->qos_data.qos_cap.q_AP.txop_request)
                priv->qos_data.def_qos_parm.qos_flags |=
                        QOS_PARAM_FLG_TXOP_TYPE_MSK;

        if (priv->qos_data.qos_active)
                priv->qos_data.def_qos_parm.qos_flags |=
                        QOS_PARAM_FLG_UPDATE_EDCA_MSK;

        spin_unlock_irqrestore(&priv->lock, flags);

        if (force || iwl3945_is_associated(priv)) {
                IWL_DEBUG_QOS("send QoS cmd with QoS active %d \n",
                              priv->qos_data.qos_active);

                iwl3945_send_qos_params_command(priv,
                                &(priv->qos_data.def_qos_parm));
        }
}

/*
 * Power management (not Tx power!) functions
 */
#define MSEC_TO_USEC 1024

#define NOSLP __constant_cpu_to_le32(0)
#define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK
#define SLP_TIMEOUT(T) __constant_cpu_to_le32((T) * MSEC_TO_USEC)
#define SLP_VEC(X0, X1, X2, X3, X4) {__constant_cpu_to_le32(X0), \
                                     __constant_cpu_to_le32(X1), \
                                     __constant_cpu_to_le32(X2), \
                                     __constant_cpu_to_le32(X3), \
                                     __constant_cpu_to_le32(X4)}


/* default power management (not Tx power) table values */
/* for TIM  0-10 */
static struct iwl3945_power_vec_entry range_0[IWL_POWER_AC] = {
        {{NOSLP, SLP_TIMEOUT(0), SLP_TIMEOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
        {{SLP, SLP_TIMEOUT(200), SLP_TIMEOUT(500), SLP_VEC(1, 2, 3, 4, 4)}, 0},
        {{SLP, SLP_TIMEOUT(200), SLP_TIMEOUT(300), SLP_VEC(2, 4, 6, 7, 7)}, 0},
        {{SLP, SLP_TIMEOUT(50), SLP_TIMEOUT(100), SLP_VEC(2, 6, 9, 9, 10)}, 0},
        {{SLP, SLP_TIMEOUT(50), SLP_TIMEOUT(25), SLP_VEC(2, 7, 9, 9, 10)}, 1},
        {{SLP, SLP_TIMEOUT(25), SLP_TIMEOUT(25), SLP_VEC(4, 7, 10, 10, 10)}, 1}
};

/* for TIM > 10 */
static struct iwl3945_power_vec_entry range_1[IWL_POWER_AC] = {
        {{NOSLP, SLP_TIMEOUT(0), SLP_TIMEOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
        {{SLP, SLP_TIMEOUT(200), SLP_TIMEOUT(500),
                 SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
        {{SLP, SLP_TIMEOUT(200), SLP_TIMEOUT(300),
                 SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
        {{SLP, SLP_TIMEOUT(50), SLP_TIMEOUT(100),
                 SLP_VEC(2, 6, 9, 9, 0xFF)}, 0},
        {{SLP, SLP_TIMEOUT(50), SLP_TIMEOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
        {{SLP, SLP_TIMEOUT(25), SLP_TIMEOUT(25),
                 SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
};

int iwl3945_power_init_handle(struct iwl3945_priv *priv)
{
        int rc = 0, i;
        struct iwl3945_power_mgr *pow_data;
        int size = sizeof(struct iwl3945_power_vec_entry) * IWL_POWER_AC;
        u16 pci_pm;

        IWL_DEBUG_POWER("Initialize power \n");

        pow_data = &(priv->power_data);

        memset(pow_data, 0, sizeof(*pow_data));

        pow_data->active_index = IWL_POWER_RANGE_0;
        pow_data->dtim_val = 0xffff;

        memcpy(&pow_data->pwr_range_0[0], &range_0[0], size);
        memcpy(&pow_data->pwr_range_1[0], &range_1[0], size);

        rc = pci_read_config_word(priv->pci_dev, PCI_LINK_CTRL, &pci_pm);
        if (rc != 0)
                return 0;
        else {
                struct iwl3945_powertable_cmd *cmd;

                IWL_DEBUG_POWER("adjust power command flags\n");

                for (i = 0; i < IWL_POWER_AC; i++) {
                        cmd = &pow_data->pwr_range_0[i].cmd;

                        if (pci_pm & 0x1)
                                cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
                        else
                                cmd->flags |= IWL_POWER_PCI_PM_MSK;
                }
        }
        return rc;
}

static int iwl3945_update_power_cmd(struct iwl3945_priv *priv,
                                struct iwl3945_powertable_cmd *cmd, u32 mode)
{
        int rc = 0, i;
        u8 skip;
        u32 max_sleep = 0;
        struct iwl3945_power_vec_entry *range;
        u8 period = 0;
        struct iwl3945_power_mgr *pow_data;

        if (mode > IWL_POWER_INDEX_5) {
                IWL_DEBUG_POWER("Error invalid power mode \n");
                return -1;
        }
        pow_data = &(priv->power_data);

        if (pow_data->active_index == IWL_POWER_RANGE_0)
                range = &pow_data->pwr_range_0[0];
        else
                range = &pow_data->pwr_range_1[1];

        memcpy(cmd, &range[mode].cmd, sizeof(struct iwl3945_powertable_cmd));

#ifdef IWL_MAC80211_DISABLE
        if (priv->assoc_network != NULL) {
                unsigned long flags;

                period = priv->assoc_network->tim.tim_period;
        }
#endif  /*IWL_MAC80211_DISABLE */
        skip = range[mode].no_dtim;

        if (period == 0) {
                period = 1;
                skip = 0;
        }

        if (skip == 0) {
                max_sleep = period;
                cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
        } else {
                __le32 slp_itrvl = cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1];
                max_sleep = (le32_to_cpu(slp_itrvl) / period) * period;
                cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
        }

        for (i = 0; i < IWL_POWER_VEC_SIZE; i++) {
                if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
                        cmd->sleep_interval[i] = cpu_to_le32(max_sleep);
        }

        IWL_DEBUG_POWER("Flags value = 0x%08X\n", cmd->flags);
        IWL_DEBUG_POWER("Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
        IWL_DEBUG_POWER("Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
        IWL_DEBUG_POWER("Sleep interval vector = { %d , %d , %d , %d , %d }\n",
                        le32_to_cpu(cmd->sleep_interval[0]),
                        le32_to_cpu(cmd->sleep_interval[1]),
                        le32_to_cpu(cmd->sleep_interval[2]),
                        le32_to_cpu(cmd->sleep_interval[3]),
                        le32_to_cpu(cmd->sleep_interval[4]));

        return rc;
}

static int iwl3945_send_power_mode(struct iwl3945_priv *priv, u32 mode)
{
        u32 uninitialized_var(final_mode);
        int rc;
        struct iwl3945_powertable_cmd cmd;

        /* If on battery, set to 3,
         * if plugged into AC power, set to CAM ("continuously aware mode"),
         * else user level */
        switch (mode) {
        case IWL_POWER_BATTERY:
                final_mode = IWL_POWER_INDEX_3;
                break;
        case IWL_POWER_AC:
                final_mode = IWL_POWER_MODE_CAM;
                break;
        default:
                final_mode = mode;
                break;
        }

        iwl3945_update_power_cmd(priv, &cmd, final_mode);

        rc = iwl3945_send_cmd_pdu(priv, POWER_TABLE_CMD, sizeof(cmd), &cmd);

        if (final_mode == IWL_POWER_MODE_CAM)
                clear_bit(STATUS_POWER_PMI, &priv->status);
        else
                set_bit(STATUS_POWER_PMI, &priv->status);

        return rc;
}

/**
 * iwl3945_scan_cancel - Cancel any currently executing HW scan
 *
 * NOTE: priv->mutex is not required before calling this function
 */
static int iwl3945_scan_cancel(struct iwl3945_priv *priv)
{
        if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
                clear_bit(STATUS_SCANNING, &priv->status);
                return 0;
        }

        if (test_bit(STATUS_SCANNING, &priv->status)) {
                if (!test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
                        IWL_DEBUG_SCAN("Queuing scan abort.\n");
                        set_bit(STATUS_SCAN_ABORTING, &priv->status);
                        queue_work(priv->workqueue, &priv->abort_scan);

                } else
                        IWL_DEBUG_SCAN("Scan abort already in progress.\n");

                return test_bit(STATUS_SCANNING, &priv->status);
        }

        return 0;
}

/**
 * iwl3945_scan_cancel_timeout - Cancel any currently executing HW scan
 * @ms: amount of time to wait (in milliseconds) for scan to abort
 *
 * NOTE: priv->mutex must be held before calling this function
 */
static int iwl3945_scan_cancel_timeout(struct iwl3945_priv *priv, unsigned long ms)
{
        unsigned long now = jiffies;
        int ret;

        ret = iwl3945_scan_cancel(priv);
        if (ret && ms) {
                mutex_unlock(&priv->mutex);
                while (!time_after(jiffies, now + msecs_to_jiffies(ms)) &&
                                test_bit(STATUS_SCANNING, &priv->status))
                        msleep(1);
                mutex_lock(&priv->mutex);

                return test_bit(STATUS_SCANNING, &priv->status);
        }

        return ret;
}

#define MAX_UCODE_BEACON_INTERVAL       1024
#define INTEL_CONN_LISTEN_INTERVAL      __constant_cpu_to_le16(0xA)

static __le16 iwl3945_adjust_beacon_interval(u16 beacon_val)
{
        u16 new_val = 0;
        u16 beacon_factor = 0;

        beacon_factor =
            (beacon_val + MAX_UCODE_BEACON_INTERVAL)
                / MAX_UCODE_BEACON_INTERVAL;
        new_val = beacon_val / beacon_factor;

        return cpu_to_le16(new_val);
}

static void iwl3945_setup_rxon_timing(struct iwl3945_priv *priv)
{
        u64 interval_tm_unit;
        u64 tsf, result;
        unsigned long flags;
        struct ieee80211_conf *conf = NULL;
        u16 beacon_int = 0;

        conf = ieee80211_get_hw_conf(priv->hw);

        spin_lock_irqsave(&priv->lock, flags);
        priv->rxon_timing.timestamp.dw[1] = cpu_to_le32(priv->timestamp1);
        priv->rxon_timing.timestamp.dw[0] = cpu_to_le32(priv->timestamp0);

        priv->rxon_timing.listen_interval = INTEL_CONN_LISTEN_INTERVAL;

        tsf = priv->timestamp1;
        tsf = ((tsf << 32) | priv->timestamp0);

        beacon_int = priv->beacon_int;
        spin_unlock_irqrestore(&priv->lock, flags);

        if (priv->iw_mode == NL80211_IFTYPE_STATION) {
                if (beacon_int == 0) {
                        priv->rxon_timing.beacon_interval = cpu_to_le16(100);
                        priv->rxon_timing.beacon_init_val = cpu_to_le32(102400);
                } else {
                        priv->rxon_timing.beacon_interval =
                                cpu_to_le16(beacon_int);
                        priv->rxon_timing.beacon_interval =
                            iwl3945_adjust_beacon_interval(
                                le16_to_cpu(priv->rxon_timing.beacon_interval));
                }

                priv->rxon_timing.atim_window = 0;
        } else {
                priv->rxon_timing.beacon_interval =
                        iwl3945_adjust_beacon_interval(conf->beacon_int);
                /* TODO: we need to get atim_window from upper stack
                 * for now we set to 0 */
                priv->rxon_timing.atim_window = 0;
        }

        interval_tm_unit =
                (le16_to_cpu(priv->rxon_timing.beacon_interval) * 1024);
        result = do_div(tsf, interval_tm_unit);
        priv->rxon_timing.beacon_init_val =
            cpu_to_le32((u32) ((u64) interval_tm_unit - result));

        IWL_DEBUG_ASSOC
            ("beacon interval %d beacon timer %d beacon tim %d\n",
                le16_to_cpu(priv->rxon_timing.beacon_interval),
                le32_to_cpu(priv->rxon_timing.beacon_init_val),
                le16_to_cpu(priv->rxon_timing.atim_window));
}

static int iwl3945_scan_initiate(struct iwl3945_priv *priv)
{
        if (priv->iw_mode == NL80211_IFTYPE_AP) {
                IWL_ERROR("APs don't scan.\n");
                return 0;
        }

        if (!iwl3945_is_ready_rf(priv)) {
                IWL_DEBUG_SCAN("Aborting scan due to not ready.\n");
                return -EIO;
        }

        if (test_bit(STATUS_SCANNING, &priv->status)) {
                IWL_DEBUG_SCAN("Scan already in progress.\n");
                return -EAGAIN;
        }

        if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
                IWL_DEBUG_SCAN("Scan request while abort pending.  "
                               "Queuing.\n");
                return -EAGAIN;
        }

        IWL_DEBUG_INFO("Starting scan...\n");
        if (priv->cfg->sku & IWL_SKU_G)
                priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ);
        if (priv->cfg->sku & IWL_SKU_A)
                priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ);
        set_bit(STATUS_SCANNING, &priv->status);
        priv->scan_start = jiffies;
        priv->scan_pass_start = priv->scan_start;

        queue_work(priv->workqueue, &priv->request_scan);

        return 0;
}

static int iwl3945_set_rxon_hwcrypto(struct iwl3945_priv *priv, int hw_decrypt)
{
        struct iwl3945_rxon_cmd *rxon = &priv->staging_rxon;

        if (hw_decrypt)
                rxon->filter_flags &= ~RXON_FILTER_DIS_DECRYPT_MSK;
        else
                rxon->filter_flags |= RXON_FILTER_DIS_DECRYPT_MSK;

        return 0;
}

static void iwl3945_set_flags_for_phymode(struct iwl3945_priv *priv,
                                          enum ieee80211_band band)
{
        if (band == IEEE80211_BAND_5GHZ) {
                priv->staging_rxon.flags &=
                    ~(RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK
                      | RXON_FLG_CCK_MSK);
                priv->staging_rxon.flags |= RXON_FLG_SHORT_SLOT_MSK;
        } else {
                /* Copied from iwl3945_bg_post_associate() */
                if (priv->assoc_capability & WLAN_CAPABILITY_SHORT_SLOT_TIME)
                        priv->staging_rxon.flags |= RXON_FLG_SHORT_SLOT_MSK;
                else
                        priv->staging_rxon.flags &= ~RXON_FLG_SHORT_SLOT_MSK;

                if (priv->iw_mode == NL80211_IFTYPE_ADHOC)
                        priv->staging_rxon.flags &= ~RXON_FLG_SHORT_SLOT_MSK;

                priv->staging_rxon.flags |= RXON_FLG_BAND_24G_MSK;
                priv->staging_rxon.flags |= RXON_FLG_AUTO_DETECT_MSK;
                priv->staging_rxon.flags &= ~RXON_FLG_CCK_MSK;
        }
}

/*
 * initialize rxon structure with default values from eeprom
 */
static void iwl3945_connection_init_rx_config(struct iwl3945_priv *priv,
                                              int mode)
{
        const struct iwl3945_channel_info *ch_info;

        memset(&priv->staging_rxon, 0, sizeof(priv->staging_rxon));

        switch (mode) {
        case NL80211_IFTYPE_AP:
                priv->staging_rxon.dev_type = RXON_DEV_TYPE_AP;
                break;

        case NL80211_IFTYPE_STATION:
                priv->staging_rxon.dev_type = RXON_DEV_TYPE_ESS;
                priv->staging_rxon.filter_flags = RXON_FILTER_ACCEPT_GRP_MSK;
                break;

        case NL80211_IFTYPE_ADHOC:
                priv->staging_rxon.dev_type = RXON_DEV_TYPE_IBSS;
                priv->staging_rxon.flags = RXON_FLG_SHORT_PREAMBLE_MSK;
                priv->staging_rxon.filter_flags = RXON_FILTER_BCON_AWARE_MSK |
                                                  RXON_FILTER_ACCEPT_GRP_MSK;
                break;

        case NL80211_IFTYPE_MONITOR:
                priv->staging_rxon.dev_type = RXON_DEV_TYPE_SNIFFER;
                priv->staging_rxon.filter_flags = RXON_FILTER_PROMISC_MSK |
                    RXON_FILTER_CTL2HOST_MSK | RXON_FILTER_ACCEPT_GRP_MSK;
                break;
        default:
                IWL_ERROR("Unsupported interface type %d\n", mode);
                break;
        }

#if 0
        /* TODO:  Figure out when short_preamble would be set and cache from
         * that */
        if (!hw_to_local(priv->hw)->short_preamble)
                priv->staging_rxon.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
        else
                priv->staging_rxon.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
#endif

        ch_info = iwl3945_get_channel_info(priv, priv->band,
                                       le16_to_cpu(priv->active_rxon.channel));

        if (!ch_info)
                ch_info = &priv->channel_info[0];

        /*
         * in some case A channels are all non IBSS
         * in this case force B/G channel
         */
        if ((mode == NL80211_IFTYPE_ADHOC) && !(is_channel_ibss(ch_info)))
                ch_info = &priv->channel_info[0];

        priv->staging_rxon.channel = cpu_to_le16(ch_info->channel);
        if (is_channel_a_band(ch_info))
                priv->band = IEEE80211_BAND_5GHZ;
        else
                priv->band = IEEE80211_BAND_2GHZ;

        iwl3945_set_flags_for_phymode(priv, priv->band);

        priv->staging_rxon.ofdm_basic_rates =
            (IWL_OFDM_RATES_MASK >> IWL_FIRST_OFDM_RATE) & 0xFF;
        priv->staging_rxon.cck_basic_rates =
            (IWL_CCK_RATES_MASK >> IWL_FIRST_CCK_RATE) & 0xF;
}

static int iwl3945_set_mode(struct iwl3945_priv *priv, int mode)
{
        if (mode == NL80211_IFTYPE_ADHOC) {
                const struct iwl3945_channel_info *ch_info;

                ch_info = iwl3945_get_channel_info(priv,
                        priv->band,
                        le16_to_cpu(priv->staging_rxon.channel));

                if (!ch_info || !is_channel_ibss(ch_info)) {
                        IWL_ERROR("channel %d not IBSS channel\n",
                                  le16_to_cpu(priv->staging_rxon.channel));
                        return -EINVAL;
                }
        }

        iwl3945_connection_init_rx_config(priv, mode);
        memcpy(priv->staging_rxon.node_addr, priv->mac_addr, ETH_ALEN);

        iwl3945_clear_stations_table(priv);

        /* don't commit rxon if rf-kill is on*/
        if (!iwl3945_is_ready_rf(priv))
                return -EAGAIN;

        cancel_delayed_work(&priv->scan_check);
        if (iwl3945_scan_cancel_timeout(priv, 100)) {
                IWL_WARNING("Aborted scan still in progress after 100ms\n");
                IWL_DEBUG_MAC80211("leaving - scan abort failed.\n");
                return -EAGAIN;
        }

        iwl3945_commit_rxon(priv);

        return 0;
}

static void iwl3945_build_tx_cmd_hwcrypto(struct iwl3945_priv *priv,
                                      struct ieee80211_tx_info *info,
                                      struct iwl3945_cmd *cmd,
                                      struct sk_buff *skb_frag,
                                      int last_frag)
{
        struct iwl3945_hw_key *keyinfo =
            &priv->stations[info->control.hw_key->hw_key_idx].keyinfo;

        switch (keyinfo->alg) {
        case ALG_CCMP:
                cmd->cmd.tx.sec_ctl = TX_CMD_SEC_CCM;
                memcpy(cmd->cmd.tx.key, keyinfo->key, keyinfo->keylen);
                IWL_DEBUG_TX("tx_cmd with AES hwcrypto\n");
                break;

        case ALG_TKIP:
#if 0
                cmd->cmd.tx.sec_ctl = TX_CMD_SEC_TKIP;

                if (last_frag)
                        memcpy(cmd->cmd.tx.tkip_mic.byte, skb_frag->tail - 8,
                               8);
                else
                        memset(cmd->cmd.tx.tkip_mic.byte, 0, 8);
#endif
                break;

        case ALG_WEP:
                cmd->cmd.tx.sec_ctl = TX_CMD_SEC_WEP |
                    (info->control.hw_key->hw_key_idx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT;

                if (keyinfo->keylen == 13)
                        cmd->cmd.tx.sec_ctl |= TX_CMD_SEC_KEY128;

                memcpy(&cmd->cmd.tx.key[3], keyinfo->key, keyinfo->keylen);

                IWL_DEBUG_TX("Configuring packet for WEP encryption "
                             "with key %d\n", info->control.hw_key->hw_key_idx);
                break;

        default:
                printk(KERN_ERR "Unknown encode alg %d\n", keyinfo->alg);
                break;
        }
}

/*
 * handle build REPLY_TX command notification.
 */
static void iwl3945_build_tx_cmd_basic(struct iwl3945_priv *priv,
                                  struct iwl3945_cmd *cmd,
                                  struct ieee80211_tx_info *info,
                                  struct ieee80211_hdr *hdr,
                                  int is_unicast, u8 std_id)
{
        __le16 fc = hdr->frame_control;
        __le32 tx_flags = cmd->cmd.tx.tx_flags;
        u8 rc_flags = info->control.rates[0].flags;

        cmd->cmd.tx.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
        if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) {
                tx_flags |= TX_CMD_FLG_ACK_MSK;
                if (ieee80211_is_mgmt(fc))
                        tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
                if (ieee80211_is_probe_resp(fc) &&
                    !(le16_to_cpu(hdr->seq_ctrl) & 0xf))
                        tx_flags |= TX_CMD_FLG_TSF_MSK;
        } else {
                tx_flags &= (~TX_CMD_FLG_ACK_MSK);
                tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
        }

        cmd->cmd.tx.sta_id = std_id;
        if (ieee80211_has_morefrags(fc))
                tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;

        if (ieee80211_is_data_qos(fc)) {
                u8 *qc = ieee80211_get_qos_ctl(hdr);
                cmd->cmd.tx.tid_tspec = qc[0] & 0xf;
                tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
        } else {
                tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
        }

        if (rc_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
                tx_flags |= TX_CMD_FLG_RTS_MSK;
                tx_flags &= ~TX_CMD_FLG_CTS_MSK;
        } else if (rc_flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
                tx_flags &= ~TX_CMD_FLG_RTS_MSK;
                tx_flags |= TX_CMD_FLG_CTS_MSK;
        }

        if ((tx_flags & TX_CMD_FLG_RTS_MSK) || (tx_flags & TX_CMD_FLG_CTS_MSK))
                tx_flags |= TX_CMD_FLG_FULL_TXOP_PROT_MSK;

        tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
        if (ieee80211_is_mgmt(fc)) {
                if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
                        cmd->cmd.tx.timeout.pm_frame_timeout = cpu_to_le16(3);
                else
                        cmd->cmd.tx.timeout.pm_frame_timeout = cpu_to_le16(2);
        } else {
                cmd->cmd.tx.timeout.pm_frame_timeout = 0;
#ifdef CONFIG_IWL3945_LEDS
                priv->rxtxpackets += le16_to_cpu(cmd->cmd.tx.len);
#endif
        }

        cmd->cmd.tx.driver_txop = 0;
        cmd->cmd.tx.tx_flags = tx_flags;
        cmd->cmd.tx.next_frame_len = 0;
}

/**
 * iwl3945_get_sta_id - Find station's index within station table
 */
static int iwl3945_get_sta_id(struct iwl3945_priv *priv, struct ieee80211_hdr *hdr)
{
        int sta_id;
        u16 fc = le16_to_cpu(hdr->frame_control);

        /* If this frame is broadcast or management, use broadcast station id */
        if (((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) ||
            is_multicast_ether_addr(hdr->addr1))
                return priv->hw_setting.bcast_sta_id;

        switch (priv->iw_mode) {

        /* If we are a client station in a BSS network, use the special
         * AP station entry (that's the only station we communicate with) */
        case NL80211_IFTYPE_STATION:
                return IWL_AP_ID;

        /* If we are an AP, then find the station, or use BCAST */
        case NL80211_IFTYPE_AP:
                sta_id = iwl3945_hw_find_station(priv, hdr->addr1);
                if (sta_id != IWL_INVALID_STATION)
                        return sta_id;
                return priv->hw_setting.bcast_sta_id;

        /* If this frame is going out to an IBSS network, find the station,
         * or create a new station table entry */
        case NL80211_IFTYPE_ADHOC: {
                /* Create new station table entry */
                sta_id = iwl3945_hw_find_station(priv, hdr->addr1);
                if (sta_id != IWL_INVALID_STATION)
                        return sta_id;

                sta_id = iwl3945_add_station(priv, hdr->addr1, 0, CMD_ASYNC);

                if (sta_id != IWL_INVALID_STATION)
                        return sta_id;

                IWL_DEBUG_DROP("Station %pM not in station map. "
                               "Defaulting to broadcast...\n",
                               hdr->addr1);
                iwl3945_print_hex_dump(IWL_DL_DROP, (u8 *) hdr, sizeof(*hdr));
                return priv->hw_setting.bcast_sta_id;
        }
        /* If we are in monitor mode, use BCAST. This is required for
         * packet injection. */
        case NL80211_IFTYPE_MONITOR:
                return priv->hw_setting.bcast_sta_id;

        default:
                IWL_WARNING("Unknown mode of operation: %d\n", priv->iw_mode);
                return priv->hw_setting.bcast_sta_id;
        }
}

/*
 * start REPLY_TX command process
 */
static int iwl3945_tx_skb(struct iwl3945_priv *priv, struct sk_buff *skb)
{
        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
        struct iwl3945_tfd_frame *tfd;
        u32 *control_flags;
        int txq_id = skb_get_queue_mapping(skb);
        struct iwl3945_tx_queue *txq = NULL;
        struct iwl3945_queue *q = NULL;
        dma_addr_t phys_addr;
        dma_addr_t txcmd_phys;
        struct iwl3945_cmd *out_cmd = NULL;
        u16 len, idx, len_org, hdr_len;
        u8 id;
        u8 unicast;
        u8 sta_id;
        u8 tid = 0;
        u16 seq_number = 0;
        __le16 fc;
        u8 wait_write_ptr = 0;
        u8 *qc = NULL;
        unsigned long flags;
        int rc;

        spin_lock_irqsave(&priv->lock, flags);
        if (iwl3945_is_rfkill(priv)) {
                IWL_DEBUG_DROP("Dropping - RF KILL\n");
                goto drop_unlock;
        }

        if ((ieee80211_get_tx_rate(priv->hw, info)->hw_value & 0xFF) == IWL_INVALID_RATE) {
                IWL_ERROR("ERROR: No TX rate available.\n");
                goto drop_unlock;
        }

        unicast = !is_multicast_ether_addr(hdr->addr1);
        id = 0;

        fc = hdr->frame_control;

#ifdef CONFIG_IWL3945_DEBUG
        if (ieee80211_is_auth(fc))
                IWL_DEBUG_TX("Sending AUTH frame\n");
        else if (ieee80211_is_assoc_req(fc))
                IWL_DEBUG_TX("Sending ASSOC frame\n");
        else if (ieee80211_is_reassoc_req(fc))
                IWL_DEBUG_TX("Sending REASSOC frame\n");
#endif

        /* drop all data frame if we are not associated */
        if (ieee80211_is_data(fc) &&
            (priv->iw_mode != NL80211_IFTYPE_MONITOR) && /* packet injection */
            (!iwl3945_is_associated(priv) ||
             ((priv->iw_mode == NL80211_IFTYPE_STATION) && !priv->assoc_id))) {
                IWL_DEBUG_DROP("Dropping - !iwl3945_is_associated\n");
                goto drop_unlock;
        }

        spin_unlock_irqrestore(&priv->lock, flags);

        hdr_len = ieee80211_hdrlen(fc);

        /* Find (or create) index into station table for destination station */
        sta_id = iwl3945_get_sta_id(priv, hdr);
        if (sta_id == IWL_INVALID_STATION) {
                IWL_DEBUG_DROP("Dropping - INVALID STATION: %pM\n",
                               hdr->addr1);
                goto drop;
        }

        IWL_DEBUG_RATE("station Id %d\n", sta_id);

        if (ieee80211_is_data_qos(fc)) {
                qc = ieee80211_get_qos_ctl(hdr);
                tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
                seq_number = priv->stations[sta_id].tid[tid].seq_number &
                                IEEE80211_SCTL_SEQ;
                hdr->seq_ctrl = cpu_to_le16(seq_number) |
                        (hdr->seq_ctrl &
                                __constant_cpu_to_le16(IEEE80211_SCTL_FRAG));
                seq_number += 0x10;
        }

        /* Descriptor for chosen Tx queue */
        txq = &priv->txq[txq_id];
        q = &txq->q;

        spin_lock_irqsave(&priv->lock, flags);

        /* Set up first empty TFD within this queue's circular TFD buffer */
        tfd = &txq->bd[q->write_ptr];
        memset(tfd, 0, sizeof(*tfd));
        control_flags = (u32 *) tfd;
        idx = get_cmd_index(q, q->write_ptr, 0);

        /* Set up driver data for this TFD */
        memset(&(txq->txb[q->write_ptr]), 0, sizeof(struct iwl3945_tx_info));
        txq->txb[q->write_ptr].skb[0] = skb;

        /* Init first empty entry in queue's array of Tx/cmd buffers */
        out_cmd = &txq->cmd[idx];
        memset(&out_cmd->hdr, 0, sizeof(out_cmd->hdr));
        memset(&out_cmd->cmd.tx, 0, sizeof(out_cmd->cmd.tx));

        /*
         * Set up the Tx-command (not MAC!) header.
         * Store the chosen Tx queue and TFD index within the sequence field;
         * after Tx, uCode's Tx response will return this value so driver can
         * locate the frame within the tx queue and do post-tx processing.
         */
        out_cmd->hdr.cmd = REPLY_TX;
        out_cmd->hdr.sequence = cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) |
                                INDEX_TO_SEQ(q->write_ptr)));

        /* Copy MAC header from skb into command buffer */
        memcpy(out_cmd->cmd.tx.hdr, hdr, hdr_len);

        /*
         * Use the first empty entry in this queue's command buffer array
         * to contain the Tx command and MAC header concatenated together
         * (payload data will be in another buffer).
         * Size of this varies, due to varying MAC header length.
         * If end is not dword aligned, we'll have 2 extra bytes at the end
         * of the MAC header (device reads on dword boundaries).
         * We'll tell device about this padding later.
         */
        len = priv->hw_setting.tx_cmd_len +
                sizeof(struct iwl3945_cmd_header) + hdr_len;

        len_org = len;
        len = (len + 3) & ~3;

        if (len_org != len)
                len_org = 1;
        else
                len_org = 0;

        /* Physical address of this Tx command's header (not MAC header!),
         * within command buffer array. */
        txcmd_phys = txq->dma_addr_cmd + sizeof(struct iwl3945_cmd) * idx +
                     offsetof(struct iwl3945_cmd, hdr);

        /* Add buffer containing Tx command and MAC(!) header to TFD's
         * first entry */
        iwl3945_hw_txq_attach_buf_to_tfd(priv, tfd, txcmd_phys, len);

        if (info->control.hw_key)
                iwl3945_build_tx_cmd_hwcrypto(priv, info, out_cmd, skb, 0);

        /* Set up TFD's 2nd entry to point directly to remainder of skb,
         * if any (802.11 null frames have no payload). */
        len = skb->len - hdr_len;
        if (len) {
                phys_addr = pci_map_single(priv->pci_dev, skb->data + hdr_len,
                                           len, PCI_DMA_TODEVICE);
                iwl3945_hw_txq_attach_buf_to_tfd(priv, tfd, phys_addr, len);
        }

        if (!len)
                /* If there is no payload, then we use only one Tx buffer */
                *control_flags = TFD_CTL_COUNT_SET(1);
        else
                /* Else use 2 buffers.
                 * Tell 3945 about any padding after MAC header */
                *control_flags = TFD_CTL_COUNT_SET(2) |
                        TFD_CTL_PAD_SET(U32_PAD(len));

        /* Total # bytes to be transmitted */
        len = (u16)skb->len;
        out_cmd->cmd.tx.len = cpu_to_le16(len);

        /* TODO need this for burst mode later on */
        iwl3945_build_tx_cmd_basic(priv, out_cmd, info, hdr, unicast, sta_id);

        /* set is_hcca to 0; it probably will never be implemented */
        iwl3945_hw_build_tx_cmd_rate(priv, out_cmd, info, hdr, sta_id, 0);

        out_cmd->cmd.tx.tx_flags &= ~TX_CMD_FLG_ANT_A_MSK;
        out_cmd->cmd.tx.tx_flags &= ~TX_CMD_FLG_ANT_B_MSK;

        if (!ieee80211_has_morefrags(hdr->frame_control)) {
                txq->need_update = 1;
                if (qc)
                        priv->stations[sta_id].tid[tid].seq_number = seq_number;
        } else {
                wait_write_ptr = 1;
                txq->need_update = 0;
        }

        iwl3945_print_hex_dump(IWL_DL_TX, out_cmd->cmd.payload,
                           sizeof(out_cmd->cmd.tx));

        iwl3945_print_hex_dump(IWL_DL_TX, (u8 *)out_cmd->cmd.tx.hdr,
                           ieee80211_hdrlen(fc));

        /* Tell device the write index *just past* this latest filled TFD */
        q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd);
        rc = iwl3945_tx_queue_update_write_ptr(priv, txq);
        spin_unlock_irqrestore(&priv->lock, flags);

        if (rc)
                return rc;

        if ((iwl3945_queue_space(q) < q->high_mark)
            && priv->mac80211_registered) {
                if (wait_write_ptr) {
                        spin_lock_irqsave(&priv->lock, flags);
                        txq->need_update = 1;
                        iwl3945_tx_queue_update_write_ptr(priv, txq);
                        spin_unlock_irqrestore(&priv->lock, flags);
                }

                ieee80211_stop_queue(priv->hw, skb_get_queue_mapping(skb));
        }

        return 0;

drop_unlock:
        spin_unlock_irqrestore(&priv->lock, flags);
drop:
        return -1;
}

static void iwl3945_set_rate(struct iwl3945_priv *priv)
{
        const struct ieee80211_supported_band *sband = NULL;
        struct ieee80211_rate *rate;
        int i;

        sband = iwl3945_get_band(priv, priv->band);
        if (!sband) {
                IWL_ERROR("Failed to set rate: unable to get hw mode\n");
                return;
        }

        priv->active_rate = 0;
        priv->active_rate_basic = 0;

        IWL_DEBUG_RATE("Setting rates for %s GHz\n",
                       sband->band == IEEE80211_BAND_2GHZ ? "2.4" : "5");

        for (i = 0; i < sband->n_bitrates; i++) {
                rate = &sband->bitrates[i];
                if ((rate->hw_value < IWL_RATE_COUNT) &&
                    !(rate->flags & IEEE80211_CHAN_DISABLED)) {
                        IWL_DEBUG_RATE("Adding rate index %d (plcp %d)\n",
                                       rate->hw_value, iwl3945_rates[rate->hw_value].plcp);
                        priv->active_rate |= (1 << rate->hw_value);
                }
        }

        IWL_DEBUG_RATE("Set active_rate = %0x, active_rate_basic = %0x\n",
                       priv->active_rate, priv->active_rate_basic);

        /*
         * If a basic rate is configured, then use it (adding IWL_RATE_1M_MASK)
         * otherwise set it to the default of all CCK rates and 6, 12, 24 for
         * OFDM
         */
        if (priv->active_rate_basic & IWL_CCK_BASIC_RATES_MASK)
                priv->staging_rxon.cck_basic_rates =
                    ((priv->active_rate_basic &
                      IWL_CCK_RATES_MASK) >> IWL_FIRST_CCK_RATE) & 0xF;
        else
                priv->staging_rxon.cck_basic_rates =
                    (IWL_CCK_BASIC_RATES_MASK >> IWL_FIRST_CCK_RATE) & 0xF;

        if (priv->active_rate_basic & IWL_OFDM_BASIC_RATES_MASK)
                priv->staging_rxon.ofdm_basic_rates =
                    ((priv->active_rate_basic &
                      (IWL_OFDM_BASIC_RATES_MASK | IWL_RATE_6M_MASK)) >>
                      IWL_FIRST_OFDM_RATE) & 0xFF;
        else
                priv->staging_rxon.ofdm_basic_rates =
                   (IWL_OFDM_BASIC_RATES_MASK >> IWL_FIRST_OFDM_RATE) & 0xFF;
}

static void iwl3945_radio_kill_sw(struct iwl3945_priv *priv, int disable_radio)
{
        unsigned long flags;

        if (!!disable_radio == test_bit(STATUS_RF_KILL_SW, &priv->status))
                return;

        IWL_DEBUG_RF_KILL("Manual SW RF KILL set to: RADIO %s\n",
                          disable_radio ? "OFF" : "ON");

        if (disable_radio) {
                iwl3945_scan_cancel(priv);
                /* FIXME: This is a workaround for AP */
                if (priv->iw_mode != NL80211_IFTYPE_AP) {
                        spin_lock_irqsave(&priv->lock, flags);
                        iwl3945_write32(priv, CSR_UCODE_DRV_GP1_SET,
                                    CSR_UCODE_SW_BIT_RFKILL);
                        spin_unlock_irqrestore(&priv->lock, flags);
                        iwl3945_send_card_state(priv, CARD_STATE_CMD_DISABLE, 0);
                        set_bit(STATUS_RF_KILL_SW, &priv->status);
                }
                return;
        }

        spin_lock_irqsave(&priv->lock, flags);
        iwl3945_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);

        clear_bit(STATUS_RF_KILL_SW, &priv->status);
        spin_unlock_irqrestore(&priv->lock, flags);

        /* wake up ucode */
        msleep(10);

        spin_lock_irqsave(&priv->lock, flags);
        iwl3945_read32(priv, CSR_UCODE_DRV_GP1);
        if (!iwl3945_grab_nic_access(priv))
                iwl3945_release_nic_access(priv);
        spin_unlock_irqrestore(&priv->lock, flags);

        if (test_bit(STATUS_RF_KILL_HW, &priv->status)) {
                IWL_DEBUG_RF_KILL("Can not turn radio back on - "
                                  "disabled by HW switch\n");
                return;
        }

        if (priv->is_open)
                queue_work(priv->workqueue, &priv->restart);
        return;
}

void iwl3945_set_decrypted_flag(struct iwl3945_priv *priv, struct sk_buff *skb,
                            u32 decrypt_res, struct ieee80211_rx_status *stats)
{
        u16 fc =
            le16_to_cpu(((struct ieee80211_hdr *)skb->data)->frame_control);

        if (priv->active_rxon.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK)
                return;

        if (!(fc & IEEE80211_FCTL_PROTECTED))
                return;

        IWL_DEBUG_RX("decrypt_res:0x%x\n", decrypt_res);
        switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
        case RX_RES_STATUS_SEC_TYPE_TKIP:
                if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
                    RX_RES_STATUS_BAD_ICV_MIC)
                        stats->flag |= RX_FLAG_MMIC_ERROR;
        case RX_RES_STATUS_SEC_TYPE_WEP:
        case RX_RES_STATUS_SEC_TYPE_CCMP:
                if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
                    RX_RES_STATUS_DECRYPT_OK) {
                        IWL_DEBUG_RX("hw decrypt successfully!!!\n");
                        stats->flag |= RX_FLAG_DECRYPTED;
                }
                break;

        default:
                break;
        }
}

#ifdef CONFIG_IWL3945_SPECTRUM_MEASUREMENT

#include "iwl-spectrum.h"

#define BEACON_TIME_MASK_LOW    0x00FFFFFF
#define BEACON_TIME_MASK_HIGH   0xFF000000
#define TIME_UNIT               1024

/*
 * extended beacon time format
 * time in usec will be changed into a 32-bit value in 8:24 format
 * the high 1 byte is the beacon counts
 * the lower 3 bytes is the time in usec within one beacon interval
 */

static u32 iwl3945_usecs_to_beacons(u32 usec, u32 beacon_interval)
{
        u32 quot;
        u32 rem;
        u32 interval = beacon_interval * 1024;

        if (!interval || !usec)
                return 0;

        quot = (usec / interval) & (BEACON_TIME_MASK_HIGH >> 24);
        rem = (usec % interval) & BEACON_TIME_MASK_LOW;

        return (quot << 24) + rem;
}

/* base is usually what we get from ucode with each received frame,
 * the same as HW timer counter counting down
 */

static __le32 iwl3945_add_beacon_time(u32 base, u32 addon, u32 beacon_interval)
{
        u32 base_low = base & BEACON_TIME_MASK_LOW;
        u32 addon_low = addon & BEACON_TIME_MASK_LOW;
        u32 interval = beacon_interval * TIME_UNIT;
        u32 res = (base & BEACON_TIME_MASK_HIGH) +
            (addon & BEACON_TIME_MASK_HIGH);

        if (base_low > addon_low)
                res += base_low - addon_low;
        else if (base_low < addon_low) {
                res += interval + base_low - addon_low;
                res += (1 << 24);
        } else
                res += (1 << 24);

        return cpu_to_le32(res);
}

static int iwl3945_get_measurement(struct iwl3945_priv *priv,
                               struct ieee80211_measurement_params *params,
                               u8 type)
{
        struct iwl3945_spectrum_cmd spectrum;
        struct iwl3945_rx_packet *res;
        struct iwl3945_host_cmd cmd = {
                .id = REPLY_SPECTRUM_MEASUREMENT_CMD,
                .data = (void *)&spectrum,
                .meta.flags = CMD_WANT_SKB,
        };
        u32 add_time = le64_to_cpu(params->start_time);
        int rc;
        int spectrum_resp_status;
        int duration = le16_to_cpu(params->duration);

        if (iwl3945_is_associated(priv))
                add_time =
                    iwl3945_usecs_to_beacons(
                        le64_to_cpu(params->start_time) - priv->last_tsf,
                        le16_to_cpu(priv->rxon_timing.beacon_interval));

        memset(&spectrum, 0, sizeof(spectrum));

        spectrum.channel_count = cpu_to_le16(1);
        spectrum.flags =
            RXON_FLG_TSF2HOST_MSK | RXON_FLG_ANT_A_MSK | RXON_FLG_DIS_DIV_MSK;
        spectrum.filter_flags = MEASUREMENT_FILTER_FLAG;
        cmd.len = sizeof(spectrum);
        spectrum.len = cpu_to_le16(cmd.len - sizeof(spectrum.len));

        if (iwl3945_is_associated(priv))
                spectrum.start_time =
                    iwl3945_add_beacon_time(priv->last_beacon_time,
                                add_time,
                                le16_to_cpu(priv->rxon_timing.beacon_interval));
        else
                spectrum.start_time = 0;

        spectrum.channels[0].duration = cpu_to_le32(duration * TIME_UNIT);
        spectrum.channels[0].channel = params->channel;
        spectrum.channels[0].type = type;
        if (priv->active_rxon.flags & RXON_FLG_BAND_24G_MSK)
                spectrum.flags |= RXON_FLG_BAND_24G_MSK |
                    RXON_FLG_AUTO_DETECT_MSK | RXON_FLG_TGG_PROTECT_MSK;

        rc = iwl3945_send_cmd_sync(priv, &cmd);
        if (rc)
                return rc;

        res = (struct iwl3945_rx_packet *)cmd.meta.u.skb->data;
        if (res->hdr.flags & IWL_CMD_FAILED_MSK) {
                IWL_ERROR("Bad return from REPLY_RX_ON_ASSOC command\n");
                rc = -EIO;
        }

        spectrum_resp_status = le16_to_cpu(res->u.spectrum.status);
        switch (spectrum_resp_status) {
        case 0:         /* Command will be handled */
                if (res->u.spectrum.id != 0xff) {
                        IWL_DEBUG_INFO("Replaced existing measurement: %d\n",
                                                res->u.spectrum.id);
                        priv->measurement_status &= ~MEASUREMENT_READY;
                }
                priv->measurement_status |= MEASUREMENT_ACTIVE;
                rc = 0;
                break;

        case 1:         /* Command will not be handled */
                rc = -EAGAIN;
                break;
        }

        dev_kfree_skb_any(cmd.meta.u.skb);

        return rc;
}
#endif

static void iwl3945_rx_reply_alive(struct iwl3945_priv *priv,
                               struct iwl3945_rx_mem_buffer *rxb)
{
        struct iwl3945_rx_packet *pkt = (void *)rxb->skb->data;
        struct iwl3945_alive_resp *palive;
        struct delayed_work *pwork;

        palive = &pkt->u.alive_frame;

        IWL_DEBUG_INFO("Alive ucode status 0x%08X revision "
                       "0x%01X 0x%01X\n",
                       palive->is_valid, palive->ver_type,
                       palive->ver_subtype);

        if (palive->ver_subtype == INITIALIZE_SUBTYPE) {
                IWL_DEBUG_INFO("Initialization Alive received.\n");
                memcpy(&priv->card_alive_init,
                       &pkt->u.alive_frame,
                       sizeof(struct iwl3945_init_alive_resp));
                pwork = &priv->init_alive_start;
        } else {
                IWL_DEBUG_INFO("Runtime Alive received.\n");
                memcpy(&priv->card_alive, &pkt->u.alive_frame,
                       sizeof(struct iwl3945_alive_resp));
                pwork = &priv->alive_start;
                iwl3945_disable_events(priv);
        }

        /* We delay the ALIVE response by 5ms to
         * give the HW RF Kill time to activate... */
        if (palive->is_valid == UCODE_VALID_OK)
                queue_delayed_work(priv->workqueue, pwork,
                                   msecs_to_jiffies(5));
        else
                IWL_WARNING("uCode did not respond OK.\n");
}

static void iwl3945_rx_reply_add_sta(struct iwl3945_priv *priv,
                                 struct iwl3945_rx_mem_buffer *rxb)
{
        struct iwl3945_rx_packet *pkt = (void *)rxb->skb->data;

        IWL_DEBUG_RX("Received REPLY_ADD_STA: 0x%02X\n", pkt->u.status);
        return;
}

static void iwl3945_rx_reply_error(struct iwl3945_priv *priv,
                               struct iwl3945_rx_mem_buffer *rxb)
{
        struct iwl3945_rx_packet *pkt = (void *)rxb->skb->data;

        IWL_ERROR("Error Reply type 0x%08X cmd %s (0x%02X) "
                "seq 0x%04X ser 0x%08X\n",
                le32_to_cpu(pkt->u.err_resp.error_type),
                get_cmd_string(pkt->u.err_resp.cmd_id),
                pkt->u.err_resp.cmd_id,
                le16_to_cpu(pkt->u.err_resp.bad_cmd_seq_num),
                le32_to_cpu(pkt->u.err_resp.error_info));
}

#define TX_STATUS_ENTRY(x) case TX_STATUS_FAIL_ ## x: return #x

static void iwl3945_rx_csa(struct iwl3945_priv *priv, struct iwl3945_rx_mem_buffer *rxb)
{
        struct iwl3945_rx_packet *pkt = (void *)rxb->skb->data;
        struct iwl3945_rxon_cmd *rxon = (void *)&priv->active_rxon;
        struct iwl3945_csa_notification *csa = &(pkt->u.csa_notif);
        IWL_DEBUG_11H("CSA notif: channel %d, status %d\n",
                      le16_to_cpu(csa->channel), le32_to_cpu(csa->status));
        rxon->channel = csa->channel;
        priv->staging_rxon.channel = csa->channel;
}

static void iwl3945_rx_spectrum_measure_notif(struct iwl3945_priv *priv,
                                          struct iwl3945_rx_mem_buffer *rxb)
{
#ifdef CONFIG_IWL3945_SPECTRUM_MEASUREMENT
        struct iwl3945_rx_packet *pkt = (void *)rxb->skb->data;
        struct iwl3945_spectrum_notification *report = &(pkt->u.spectrum_notif);

        if (!report->state) {
                IWL_DEBUG(IWL_DL_11H | IWL_DL_INFO,
                          "Spectrum Measure Notification: Start\n");
                return;
        }

        memcpy(&priv->measure_report, report, sizeof(*report));
        priv->measurement_status |= MEASUREMENT_READY;
#endif
}

static void iwl3945_rx_pm_sleep_notif(struct iwl3945_priv *priv,
                                  struct iwl3945_rx_mem_buffer *rxb)
{
#ifdef CONFIG_IWL3945_DEBUG
        struct iwl3945_rx_packet *pkt = (void *)rxb->skb->data;
        struct iwl3945_sleep_notification *sleep = &(pkt->u.sleep_notif);
        IWL_DEBUG_RX("sleep mode: %d, src: %d\n",
                     sleep->pm_sleep_mode, sleep->pm_wakeup_src);
#endif
}

static void iwl3945_rx_pm_debug_statistics_notif(struct iwl3945_priv *priv,
                                             struct iwl3945_rx_mem_buffer *rxb)
{
        struct iwl3945_rx_packet *pkt = (void *)rxb->skb->data;
        IWL_DEBUG_RADIO("Dumping %d bytes of unhandled "
                        "notification for %s:\n",
                        le32_to_cpu(pkt->len), get_cmd_string(pkt->hdr.cmd));
        iwl3945_print_hex_dump(IWL_DL_RADIO, pkt->u.raw, le32_to_cpu(pkt->len));
}

static void iwl3945_bg_beacon_update(struct work_struct *work)
{
        struct iwl3945_priv *priv =
                container_of(work, struct iwl3945_priv, beacon_update);
        struct sk_buff *beacon;

        /* Pull updated AP beacon from mac80211. will fail if not in AP mode */
        beacon = ieee80211_beacon_get(priv->hw, priv->vif);

        if (!beacon) {
                IWL_ERROR("update beacon failed\n");
                return;
        }

        mutex_lock(&priv->mutex);
        /* new beacon skb is allocated every time; dispose previous.*/
        if (priv->ibss_beacon)
                dev_kfree_skb(priv->ibss_beacon);

        priv->ibss_beacon = beacon;
        mutex_unlock(&priv->mutex);

        iwl3945_send_beacon_cmd(priv);
}

static void iwl3945_rx_beacon_notif(struct iwl3945_priv *priv,
                                struct iwl3945_rx_mem_buffer *rxb)
{
#ifdef CONFIG_IWL3945_DEBUG
        struct iwl3945_rx_packet *pkt = (void *)rxb->skb->data;
        struct iwl3945_beacon_notif *beacon = &(pkt->u.beacon_status);
        u8 rate = beacon->beacon_notify_hdr.rate;

        IWL_DEBUG_RX("beacon status %x retries %d iss %d "
                "tsf %d %d rate %d\n",
                le32_to_cpu(beacon->beacon_notify_hdr.status) & TX_STATUS_MSK,
                beacon->beacon_notify_hdr.failure_frame,
                le32_to_cpu(beacon->ibss_mgr_status),
                le32_to_cpu(beacon->high_tsf),
                le32_to_cpu(beacon->low_tsf), rate);
#endif

        if ((priv->iw_mode == NL80211_IFTYPE_AP) &&
            (!test_bit(STATUS_EXIT_PENDING, &priv->status)))
                queue_work(priv->workqueue, &priv->beacon_update);
}

/* Service response to REPLY_SCAN_CMD (0x80) */
static void iwl3945_rx_reply_scan(struct iwl3945_priv *priv,
                              struct iwl3945_rx_mem_buffer *rxb)
{
#ifdef CONFIG_IWL3945_DEBUG
        struct iwl3945_rx_packet *pkt = (void *)rxb->skb->data;
        struct iwl3945_scanreq_notification *notif =
            (struct iwl3945_scanreq_notification *)pkt->u.raw;

        IWL_DEBUG_RX("Scan request status = 0x%x\n", notif->status);
#endif
}

/* Service SCAN_START_NOTIFICATION (0x82) */
static void iwl3945_rx_scan_start_notif(struct iwl3945_priv *priv,
                                    struct iwl3945_rx_mem_buffer *rxb)
{
        struct iwl3945_rx_packet *pkt = (void *)rxb->skb->data;
        struct iwl3945_scanstart_notification *notif =
            (struct iwl3945_scanstart_notification *)pkt->u.raw;
        priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
        IWL_DEBUG_SCAN("Scan start: "
                       "%d [802.11%s] "
                       "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
                       notif->channel,
                       notif->band ? "bg" : "a",
                       notif->tsf_high,
                       notif->tsf_low, notif->status, notif->beacon_timer);
}

/* Service SCAN_RESULTS_NOTIFICATION (0x83) */
static void iwl3945_rx_scan_results_notif(struct iwl3945_priv *priv,
                                      struct iwl3945_rx_mem_buffer *rxb)
{
        struct iwl3945_rx_packet *pkt = (void *)rxb->skb->data;
        struct iwl3945_scanresults_notification *notif =
            (struct iwl3945_scanresults_notification *)pkt->u.raw;

        IWL_DEBUG_SCAN("Scan ch.res: "
                       "%d [802.11%s] "
                       "(TSF: 0x%08X:%08X) - %d "
                       "elapsed=%lu usec (%dms since last)\n",
                       notif->channel,
                       notif->band ? "bg" : "a",
                       le32_to_cpu(notif->tsf_high),
                       le32_to_cpu(notif->tsf_low),
                       le32_to_cpu(notif->statistics[0]),
                       le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf,
                       jiffies_to_msecs(elapsed_jiffies
                                        (priv->last_scan_jiffies, jiffies)));

        priv->last_scan_jiffies = jiffies;
        priv->next_scan_jiffies = 0;
}

/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
static void iwl3945_rx_scan_complete_notif(struct iwl3945_priv *priv,
                                       struct iwl3945_rx_mem_buffer *rxb)
{
        struct iwl3945_rx_packet *pkt = (void *)rxb->skb->data;
        struct iwl3945_scancomplete_notification *scan_notif = (void *)pkt->u.raw;

        IWL_DEBUG_SCAN("Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
                       scan_notif->scanned_channels,
                       scan_notif->tsf_low,
                       scan_notif->tsf_high, scan_notif->status);

        /* The HW is no longer scanning */
        clear_bit(STATUS_SCAN_HW, &priv->status);

        /* The scan completion notification came in, so kill that timer... */
        cancel_delayed_work(&priv->scan_check);

        IWL_DEBUG_INFO("Scan pass on %sGHz took %dms\n",
                       (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ?
                                                        "2.4" : "5.2",
                       jiffies_to_msecs(elapsed_jiffies
                                        (priv->scan_pass_start, jiffies)));

        /* Remove this scanned band from the list of pending
         * bands to scan, band G precedes A in order of scanning
         * as seen in iwl3945_bg_request_scan */
        if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ))
                priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ);
        else if (priv->scan_bands &  BIT(IEEE80211_BAND_5GHZ))
                priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ);

        /* If a request to abort was given, or the scan did not succeed
         * then we reset the scan state machine and terminate,
         * re-queuing another scan if one has been requested */
        if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
                IWL_DEBUG_INFO("Aborted scan completed.\n");
                clear_bit(STATUS_SCAN_ABORTING, &priv->status);
        } else {
                /* If there are more bands on this scan pass reschedule */
                if (priv->scan_bands > 0)
                        goto reschedule;
        }

        priv->last_scan_jiffies = jiffies;
        priv->next_scan_jiffies = 0;
        IWL_DEBUG_INFO("Setting scan to off\n");

        clear_bit(STATUS_SCANNING, &priv->status);

        IWL_DEBUG_INFO("Scan took %dms\n",
                jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));

        queue_work(priv->workqueue, &priv->scan_completed);

        return;

reschedule:
        priv->scan_pass_start = jiffies;
        queue_work(priv->workqueue, &priv->request_scan);
}

/* Handle notification from uCode that card's power state is changing
 * due to software, hardware, or critical temperature RFKILL */
static void iwl3945_rx_card_state_notif(struct iwl3945_priv *priv,
                                    struct iwl3945_rx_mem_buffer *rxb)
{
        struct iwl3945_rx_packet *pkt = (void *)rxb->skb->data;
        u32 flags = le32_to_cpu(pkt->u.card_state_notif.flags);
        unsigned long status = priv->status;

        IWL_DEBUG_RF_KILL("Card state received: HW:%s SW:%s\n",
                          (flags & HW_CARD_DISABLED) ? "Kill" : "On",
                          (flags & SW_CARD_DISABLED) ? "Kill" : "On");

        iwl3945_write32(priv, CSR_UCODE_DRV_GP1_SET,
                    CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);

        if (flags & HW_CARD_DISABLED)
                set_bit(STATUS_RF_KILL_HW, &priv->status);
        else
                clear_bit(STATUS_RF_KILL_HW, &priv->status);


        if (flags & SW_CARD_DISABLED)
                set_bit(STATUS_RF_KILL_SW, &priv->status);
        else
                clear_bit(STATUS_RF_KILL_SW, &priv->status);

        iwl3945_scan_cancel(priv);

        if ((test_bit(STATUS_RF_KILL_HW, &status) !=
             test_bit(STATUS_RF_KILL_HW, &priv->status)) ||
            (test_bit(STATUS_RF_KILL_SW, &status) !=
             test_bit(STATUS_RF_KILL_SW, &priv->status)))
                queue_work(priv->workqueue, &priv->rf_kill);
        else
                wake_up_interruptible(&priv->wait_command_queue);
}

/**
 * iwl3945_setup_rx_handlers - Initialize Rx handler callbacks
 *
 * Setup the RX handlers for each of the reply types sent from the uCode
 * to the host.
 *
 * This function chains into the hardware specific files for them to setup
 * any hardware specific handlers as well.
 */
static void iwl3945_setup_rx_handlers(struct iwl3945_priv *priv)
{
        priv->rx_handlers[REPLY_ALIVE] = iwl3945_rx_reply_alive;
        priv->rx_handlers[REPLY_ADD_STA] = iwl3945_rx_reply_add_sta;
        priv->rx_handlers[REPLY_ERROR] = iwl3945_rx_reply_error;
        priv->rx_handlers[CHANNEL_SWITCH_NOTIFICATION] = iwl3945_rx_csa;
        priv->rx_handlers[SPECTRUM_MEASURE_NOTIFICATION] =
            iwl3945_rx_spectrum_measure_notif;
        priv->rx_handlers[PM_SLEEP_NOTIFICATION] = iwl3945_rx_pm_sleep_notif;
        priv->rx_handlers[PM_DEBUG_STATISTIC_NOTIFIC] =
            iwl3945_rx_pm_debug_statistics_notif;
        priv->rx_handlers[BEACON_NOTIFICATION] = iwl3945_rx_beacon_notif;

        /*
         * The same handler is used for both the REPLY to a discrete
         * statistics request from the host as well as for the periodic
         * statistics notifications (after received beacons) from the uCode.
         */
        priv->rx_handlers[REPLY_STATISTICS_CMD] = iwl3945_hw_rx_statistics;
        priv->rx_handlers[STATISTICS_NOTIFICATION] = iwl3945_hw_rx_statistics;

        priv->rx_handlers[REPLY_SCAN_CMD] = iwl3945_rx_reply_scan;
        priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl3945_rx_scan_start_notif;
        priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
            iwl3945_rx_scan_results_notif;
        priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
            iwl3945_rx_scan_complete_notif;
        priv->rx_handlers[CARD_STATE_NOTIFICATION] = iwl3945_rx_card_state_notif;

        /* Set up hardware specific Rx handlers */
        iwl3945_hw_rx_handler_setup(priv);
}

/**
 * iwl3945_cmd_queue_reclaim - Reclaim CMD queue entries
 * When FW advances 'R' index, all entries between old and new 'R' index
 * need to be reclaimed.
 */
static void iwl3945_cmd_queue_reclaim(struct iwl3945_priv *priv,
                                      int txq_id, int index)
{
        struct iwl3945_tx_queue *txq = &priv->txq[txq_id];
        struct iwl3945_queue *q = &txq->q;
        int nfreed = 0;

        if ((index >= q->n_bd) || (iwl3945_x2_queue_used(q, index) == 0)) {
                IWL_ERROR("Read index for DMA queue txq id (%d), index %d, "
                          "is out of range [0-%d] %d %d.\n", txq_id,
                          index, q->n_bd, q->write_ptr, q->read_ptr);
                return;
        }

        for (index = iwl_queue_inc_wrap(index, q->n_bd); q->read_ptr != index;
                q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) {
                if (nfreed > 1) {
                        IWL_ERROR("HCMD skipped: index (%d) %d %d\n", index,
                                        q->write_ptr, q->read_ptr);
                        queue_work(priv->workqueue, &priv->restart);
                        break;
                }
                nfreed++;
        }
}


/**
 * iwl3945_tx_cmd_complete - Pull unused buffers off the queue and reclaim them
 * @rxb: Rx buffer to reclaim
 *
 * If an Rx buffer has an async callback associated with it the callback
 * will be executed.  The attached skb (if present) will only be freed
 * if the callback returns 1
 */
static void iwl3945_tx_cmd_complete(struct iwl3945_priv *priv,
                                struct iwl3945_rx_mem_buffer *rxb)
{
        struct iwl3945_rx_packet *pkt = (struct iwl3945_rx_packet *)rxb->skb->data;
        u16 sequence = le16_to_cpu(pkt->hdr.sequence);
        int txq_id = SEQ_TO_QUEUE(sequence);
        int index = SEQ_TO_INDEX(sequence);
        int huge = sequence & SEQ_HUGE_FRAME;
        int cmd_index;
        struct iwl3945_cmd *cmd;

        BUG_ON(txq_id != IWL_CMD_QUEUE_NUM);

        cmd_index = get_cmd_index(&priv->txq[IWL_CMD_QUEUE_NUM].q, index, huge);
        cmd = &priv->txq[IWL_CMD_QUEUE_NUM].cmd[cmd_index];

        /* Input error checking is done when commands are added to queue. */
        if (cmd->meta.flags & CMD_WANT_SKB) {
                cmd->meta.source->u.skb = rxb->skb;
                rxb->skb = NULL;
        } else if (cmd->meta.u.callback &&
                   !cmd->meta.u.callback(priv, cmd, rxb->skb))
                rxb->skb = NULL;

        iwl3945_cmd_queue_reclaim(priv, txq_id, index);

        if (!(cmd->meta.flags & CMD_ASYNC)) {
                clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
                wake_up_interruptible(&priv->wait_command_queue);
        }
}

/************************** RX-FUNCTIONS ****************************/
/*
 * Rx theory of operation
 *
 * The host allocates 32 DMA target addresses and passes the host address
 * to the firmware at register IWL_RFDS_TABLE_LOWER + N * RFD_SIZE where N is
 * 0 to 31
 *
 * Rx Queue Indexes
 * The host/firmware share two index registers for managing the Rx buffers.
 *
 * The READ index maps to the first position that the firmware may be writing
 * to -- the driver can read up to (but not including) this position and get
 * good data.
 * The READ index is managed by the firmware once the card is enabled.
 *
 * The WRITE index maps to the last position the driver has read from -- the
 * position preceding WRITE is the last slot the firmware can place a packet.
 *
 * The queue is empty (no good data) if WRITE = READ - 1, and is full if
 * WRITE = READ.
 *
 * During initialization, the host sets up the READ queue position to the first
 * INDEX position, and WRITE to the last (READ - 1 wrapped)
 *
 * When the firmware places a packet in a buffer, it will advance the READ index
 * and fire the RX interrupt.  The driver can then query the READ index and
 * process as many packets as possible, moving the WRITE index forward as it
 * resets the Rx queue buffers with new memory.
 *
 * The management in the driver is as follows:
 * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free.  When
 *   iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled
 *   to replenish the iwl->rxq->rx_free.
 * + In iwl3945_rx_replenish (scheduled) if 'processed' != 'read' then the
 *   iwl->rxq is replenished and the READ INDEX is updated (updating the
 *   'processed' and 'read' driver indexes as well)
 * + A received packet is processed and handed to the kernel network stack,
 *   detached from the iwl->rxq.  The driver 'processed' index is updated.
 * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free
 *   list. If there are no allocated buffers in iwl->rxq->rx_free, the READ
 *   INDEX is not incremented and iwl->status(RX_STALLED) is set.  If there
 *   were enough free buffers and RX_STALLED is set it is cleared.
 *
 *
 * Driver sequence:
 *
 * iwl3945_rx_queue_alloc()   Allocates rx_free
 * iwl3945_rx_replenish()     Replenishes rx_free list from rx_used, and calls
 *                            iwl3945_rx_queue_restock
 * iwl3945_rx_queue_restock() Moves available buffers from rx_free into Rx
 *                            queue, updates firmware pointers, and updates
 *                            the WRITE index.  If insufficient rx_free buffers
 *                            are available, schedules iwl3945_rx_replenish
 *
 * -- enable interrupts --
 * ISR - iwl3945_rx()         Detach iwl3945_rx_mem_buffers from pool up to the
 *                            READ INDEX, detaching the SKB from the pool.
 *                            Moves the packet buffer from queue to rx_used.
 *                            Calls iwl3945_rx_queue_restock to refill any empty
 *                            slots.
 * ...
 *
 */

/**
 * iwl3945_rx_queue_space - Return number of free slots available in queue.
 */
static int iwl3945_rx_queue_space(const struct iwl3945_rx_queue *q)
{
        int s = q->read - q->write;
        if (s <= 0)
                s += RX_QUEUE_SIZE;
        /* keep some buffer to not confuse full and empty queue */
        s -= 2;
        if (s < 0)
                s = 0;
        return s;
}

/**
 * iwl3945_rx_queue_update_write_ptr - Update the write pointer for the RX queue
 */
int iwl3945_rx_queue_update_write_ptr(struct iwl3945_priv *priv, struct iwl3945_rx_queue *q)
{
        u32 reg = 0;
        int rc = 0;
        unsigned long flags;

        spin_lock_irqsave(&q->lock, flags);

        if (q->need_update == 0)
                goto exit_unlock;

        /* If power-saving is in use, make sure device is awake */
        if (test_bit(STATUS_POWER_PMI, &priv->status)) {
                reg = iwl3945_read32(priv, CSR_UCODE_DRV_GP1);

                if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
                        iwl3945_set_bit(priv, CSR_GP_CNTRL,
                                    CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
                        goto exit_unlock;
                }

                rc = iwl3945_grab_nic_access(priv);
                if (rc)
                        goto exit_unlock;

                /* Device expects a multiple of 8 */
                iwl3945_write_direct32(priv, FH_RSCSR_CHNL0_WPTR,
                                     q->write & ~0x7);
                iwl3945_release_nic_access(priv);

        /* Else device is assumed to be awake */
        } else
                /* Device expects a multiple of 8 */
                iwl3945_write32(priv, FH_RSCSR_CHNL0_WPTR, q->write & ~0x7);


        q->need_update = 0;

 exit_unlock:
        spin_unlock_irqrestore(&q->lock, flags);
        return rc;
}

/**
 * iwl3945_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
 */
static inline __le32 iwl3945_dma_addr2rbd_ptr(struct iwl3945_priv *priv,
                                          dma_addr_t dma_addr)
{
        return cpu_to_le32((u32)dma_addr);
}

/**
 * iwl3945_rx_queue_restock - refill RX queue from pre-allocated pool
 *
 * If there are slots in the RX queue that need to be restocked,
 * and we have free pre-allocated buffers, fill the ranks as much
 * as we can, pulling from rx_free.
 *
 * This moves the 'write' index forward to catch up with 'processed', and
 * also updates the memory address in the firmware to reference the new
 * target buffer.
 */
static int iwl3945_rx_queue_restock(struct iwl3945_priv *priv)
{
        struct iwl3945_rx_queue *rxq = &priv->rxq;
        struct list_head *element;
        struct iwl3945_rx_mem_buffer *rxb;
        unsigned long flags;
        int write, rc;

        spin_lock_irqsave(&rxq->lock, flags);
        write = rxq->write & ~0x7;
        while ((iwl3945_rx_queue_space(rxq) > 0) && (rxq->free_count)) {
                /* Get next free Rx buffer, remove from free list */
                element = rxq->rx_free.next;
                rxb = list_entry(element, struct iwl3945_rx_mem_buffer, list);
                list_del(element);

                /* Point to Rx buffer via next RBD in circular buffer */
                rxq->bd[rxq->write] = iwl3945_dma_addr2rbd_ptr(priv, rxb->dma_addr);
                rxq->queue[rxq->write] = rxb;
                rxq->write = (rxq->write + 1) & RX_QUEUE_MASK;
                rxq->free_count--;
        }
        spin_unlock_irqrestore(&rxq->lock, flags);
        /* If the pre-allocated buffer pool is dropping low, schedule to
         * refill it */
        if (rxq->free_count <= RX_LOW_WATERMARK)
                queue_work(priv->workqueue, &priv->rx_replenish);


        /* If we've added more space for the firmware to place data, tell it.
         * Increment device's write pointer in multiples of 8. */
        if ((write != (rxq->write & ~0x7))
            || (abs(rxq->write - rxq->read) > 7)) {
                spin_lock_irqsave(&rxq->lock, flags);
                rxq->need_update = 1;
                spin_unlock_irqrestore(&rxq->lock, flags);
                rc = iwl3945_rx_queue_update_write_ptr(priv, rxq);
                if (rc)
                        return rc;
        }

        return 0;
}

/**
 * iwl3945_rx_replenish - Move all used packet from rx_used to rx_free
 *
 * When moving to rx_free an SKB is allocated for the slot.
 *
 * Also restock the Rx queue via iwl3945_rx_queue_restock.
 * This is called as a scheduled work item (except for during initialization)
 */
static void iwl3945_rx_allocate(struct iwl3945_priv *priv)
{
        struct iwl3945_rx_queue *rxq = &priv->rxq;
        struct list_head *element;
        struct iwl3945_rx_mem_buffer *rxb;
        unsigned long flags;
        spin_lock_irqsave(&rxq->lock, flags);
        while (!list_empty(&rxq->rx_used)) {
                element = rxq->rx_used.next;
                rxb = list_entry(element, struct iwl3945_rx_mem_buffer, list);

                /* Alloc a new receive buffer */
                rxb->skb =
                    alloc_skb(IWL_RX_BUF_SIZE, __GFP_NOWARN | GFP_ATOMIC);
                if (!rxb->skb) {
                        if (net_ratelimit())
                                printk(KERN_CRIT DRV_NAME
                                       ": Can not allocate SKB buffers\n");
                        /* We don't reschedule replenish work here -- we will
                         * call the restock method and if it still needs
                         * more buffers it will schedule replenish */
                        break;
                }

                /* If radiotap head is required, reserve some headroom here.
                 * The physical head count is a variable rx_stats->phy_count.
                 * We reserve 4 bytes here. Plus these extra bytes, the
                 * headroom of the physical head should be enough for the
                 * radiotap head that iwl3945 supported. See iwl3945_rt.
                 */
                skb_reserve(rxb->skb, 4);

                priv->alloc_rxb_skb++;
                list_del(element);

                /* Get physical address of RB/SKB */
                rxb->dma_addr =
                    pci_map_single(priv->pci_dev, rxb->skb->data,
                                   IWL_RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
                list_add_tail(&rxb->list, &rxq->rx_free);
                rxq->free_count++;
        }
        spin_unlock_irqrestore(&rxq->lock, flags);
}

/*
 * this should be called while priv->lock is locked
 */
static void __iwl3945_rx_replenish(void *data)
{
        struct iwl3945_priv *priv = data;

        iwl3945_rx_allocate(priv);
        iwl3945_rx_queue_restock(priv);
}


void iwl3945_rx_replenish(void *data)
{
        struct iwl3945_priv *priv = data;
        unsigned long flags;

        iwl3945_rx_allocate(priv);

        spin_lock_irqsave(&priv->lock, flags);
        iwl3945_rx_queue_restock(priv);
        spin_unlock_irqrestore(&priv->lock, flags);
}

/* Assumes that the skb field of the buffers in 'pool' is kept accurate.
 * If an SKB has been detached, the POOL needs to have its SKB set to NULL
 * This free routine walks the list of POOL entries and if SKB is set to
 * non NULL it is unmapped and freed
 */
static void iwl3945_rx_queue_free(struct iwl3945_priv *priv, struct iwl3945_rx_queue *rxq)
{
        int i;
        for (i = 0; i < RX_QUEUE_SIZE + RX_FREE_BUFFERS; i++) {
                if (rxq->pool[i].skb != NULL) {
                        pci_unmap_single(priv->pci_dev,
                                         rxq->pool[i].dma_addr,
                                         IWL_RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
                        dev_kfree_skb(rxq->pool[i].skb);
                }
        }

        pci_free_consistent(priv->pci_dev, 4 * RX_QUEUE_SIZE, rxq->bd,
                            rxq->dma_addr);
        rxq->bd = NULL;
}

int iwl3945_rx_queue_alloc(struct iwl3945_priv *priv)
{
        struct iwl3945_rx_queue *rxq = &priv->rxq;
        struct pci_dev *dev = priv->pci_dev;
        int i;

        spin_lock_init(&rxq->lock);
        INIT_LIST_HEAD(&rxq->rx_free);
        INIT_LIST_HEAD(&rxq->rx_used);

        /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
        rxq->bd = pci_alloc_consistent(dev, 4 * RX_QUEUE_SIZE, &rxq->dma_addr);
        if (!rxq->bd)
                return -ENOMEM;

        /* Fill the rx_used queue with _all_ of the Rx buffers */
        for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
                list_add_tail(&rxq->pool[i].list, &rxq->rx_used);

        /* Set us so that we have processed and used all buffers, but have
         * not restocked the Rx queue with fresh buffers */
        rxq->read = rxq->write = 0;
        rxq->free_count = 0;
        rxq->need_update = 0;
        return 0;
}

void iwl3945_rx_queue_reset(struct iwl3945_priv *priv, struct iwl3945_rx_queue *rxq)
{
        unsigned long flags;
        int i;
        spin_lock_irqsave(&rxq->lock, flags);
        INIT_LIST_HEAD(&rxq->rx_free);
        INIT_LIST_HEAD(&rxq->rx_used);
        /* Fill the rx_used queue with _all_ of the Rx buffers */
        for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) {
                /* In the reset function, these buffers may have been allocated
                 * to an SKB, so we need to unmap and free potential storage */
                if (rxq->pool[i].skb != NULL) {
                        pci_unmap_single(priv->pci_dev,
                                         rxq->pool[i].dma_addr,
                                         IWL_RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
                        priv->alloc_rxb_skb--;
                        dev_kfree_skb(rxq->pool[i].skb);
                        rxq->pool[i].skb = NULL;
                }
                list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
        }

        /* Set us so that we have processed and used all buffers, but have
         * not restocked the Rx queue with fresh buffers */
        rxq->read = rxq->write = 0;
        rxq->free_count = 0;
        spin_unlock_irqrestore(&rxq->lock, flags);
}

/* Convert linear signal-to-noise ratio into dB */
static u8 ratio2dB[100] = {
/*       0   1   2   3   4   5   6   7   8   9 */
         0,  0,  6, 10, 12, 14, 16, 17, 18, 19, /* 00 - 09 */
        20, 21, 22, 22, 23, 23, 24, 25, 26, 26, /* 10 - 19 */
        26, 26, 26, 27, 27, 28, 28, 28, 29, 29, /* 20 - 29 */
        29, 30, 30, 30, 31, 31, 31, 31, 32, 32, /* 30 - 39 */
        32, 32, 32, 33, 33, 33, 33, 33, 34, 34, /* 40 - 49 */
        34, 34, 34, 34, 35, 35, 35, 35, 35, 35, /* 50 - 59 */
        36, 36, 36, 36, 36, 36, 36, 37, 37, 37, /* 60 - 69 */
        37, 37, 37, 37, 37, 38, 38, 38, 38, 38, /* 70 - 79 */
        38, 38, 38, 38, 38, 39, 39, 39, 39, 39, /* 80 - 89 */
        39, 39, 39, 39, 39, 40, 40, 40, 40, 40  /* 90 - 99 */
};

/* Calculates a relative dB value from a ratio of linear
 *   (i.e. not dB) signal levels.
 * Conversion assumes that levels are voltages (20*log), not powers (10*log). */
int iwl3945_calc_db_from_ratio(int sig_ratio)
{
        /* 1000:1 or higher just report as 60 dB */
        if (sig_ratio >= 1000)
                return 60;

        /* 100:1 or higher, divide by 10 and use table,
         *   add 20 dB to make up for divide by 10 */
        if (sig_ratio >= 100)
                return 20 + (int)ratio2dB[sig_ratio/10];

        /* We shouldn't see this */
        if (sig_ratio < 1)
                return 0;

        /* Use table for ratios 1:1 - 99:1 */
        return (int)ratio2dB[sig_ratio];
}

#define PERFECT_RSSI (-20) /* dBm */
#define WORST_RSSI (-95)   /* dBm */
#define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI)

/* Calculate an indication of rx signal quality (a percentage, not dBm!).
 * See http://www.ces.clemson.edu/linux/signal_quality.shtml for info
 *   about formulas used below. */
int iwl3945_calc_sig_qual(int rssi_dbm, int noise_dbm)
{
        int sig_qual;
        int degradation = PERFECT_RSSI - rssi_dbm;

        /* If we get a noise measurement, use signal-to-noise ratio (SNR)
         * as indicator; formula is (signal dbm - noise dbm).
         * SNR at or above 40 is a great signal (100%).
         * Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator.
         * Weakest usable signal is usually 10 - 15 dB SNR. */
        if (noise_dbm) {
                if (rssi_dbm - noise_dbm >= 40)
                        return 100;
                else if (rssi_dbm < noise_dbm)
                        return 0;
                sig_qual = ((rssi_dbm - noise_dbm) * 5) / 2;

        /* Else use just the signal level.
         * This formula is a least squares fit of data points collected and
         *   compared with a reference system that had a percentage (%) display
         *   for signal quality. */
        } else
                sig_qual = (100 * (RSSI_RANGE * RSSI_RANGE) - degradation *
                            (15 * RSSI_RANGE + 62 * degradation)) /
                           (RSSI_RANGE * RSSI_RANGE);

        if (sig_qual > 100)
                sig_qual = 100;
        else if (sig_qual < 1)
                sig_qual = 0;

        return sig_qual;
}

/**
 * iwl3945_rx_handle - Main entry function for receiving responses from uCode
 *
 * Uses the priv->rx_handlers callback function array to invoke
 * the appropriate handlers, including command responses,
 * frame-received notifications, and other notifications.
 */
static void iwl3945_rx_handle(struct iwl3945_priv *priv)
{
        struct iwl3945_rx_mem_buffer *rxb;
        struct iwl3945_rx_packet *pkt;
        struct iwl3945_rx_queue *rxq = &priv->rxq;
        u32 r, i;
        int reclaim;
        unsigned long flags;
        u8 fill_rx = 0;
        u32 count = 8;

        /* uCode's read index (stored in shared DRAM) indicates the last Rx
         * buffer that the driver may process (last buffer filled by ucode). */
        r = iwl3945_hw_get_rx_read(priv);
        i = rxq->read;

        if (iwl3945_rx_queue_space(rxq) > (RX_QUEUE_SIZE / 2))
                fill_rx = 1;
        /* Rx interrupt, but nothing sent from uCode */
        if (i == r)
                IWL_DEBUG(IWL_DL_RX | IWL_DL_ISR, "r = %d, i = %d\n", r, i);

        while (i != r) {
                rxb = rxq->queue[i];

                /* If an RXB doesn't have a Rx queue slot associated with it,
                 * then a bug has been introduced in the queue refilling
                 * routines -- catch it here */
                BUG_ON(rxb == NULL);

                rxq->queue[i] = NULL;

                pci_dma_sync_single_for_cpu(priv->pci_dev, rxb->dma_addr,
                                            IWL_RX_BUF_SIZE,
                                            PCI_DMA_FROMDEVICE);
                pkt = (struct iwl3945_rx_packet *)rxb->skb->data;

                /* Reclaim a command buffer only if this packet is a response
                 *   to a (driver-originated) command.
                 * If the packet (e.g. Rx frame) originated from uCode,
                 *   there is no command buffer to reclaim.
                 * Ucode should set SEQ_RX_FRAME bit if ucode-originated,
                 *   but apparently a few don't get set; catch them here. */
                reclaim = !(pkt->hdr.sequence & SEQ_RX_FRAME) &&
                        (pkt->hdr.cmd != STATISTICS_NOTIFICATION) &&
                        (pkt->hdr.cmd != REPLY_TX);

                /* Based on type of command response or notification,
                 *   handle those that need handling via function in
                 *   rx_handlers table.  See iwl3945_setup_rx_handlers() */
                if (priv->rx_handlers[pkt->hdr.cmd]) {
                        IWL_DEBUG(IWL_DL_HOST_COMMAND | IWL_DL_RX | IWL_DL_ISR,
                                "r = %d, i = %d, %s, 0x%02x\n", r, i,
                                get_cmd_string(pkt->hdr.cmd), pkt->hdr.cmd);
                        priv->rx_handlers[pkt->hdr.cmd] (priv, rxb);
                } else {
                        /* No handling needed */
                        IWL_DEBUG(IWL_DL_HOST_COMMAND | IWL_DL_RX | IWL_DL_ISR,
                                "r %d i %d No handler needed for %s, 0x%02x\n",
                                r, i, get_cmd_string(pkt->hdr.cmd),
                                pkt->hdr.cmd);
                }

                if (reclaim) {
                        /* Invoke any callbacks, transfer the skb to caller, and
                         * fire off the (possibly) blocking iwl3945_send_cmd()
                         * as we reclaim the driver command queue */
                        if (rxb && rxb->skb)
                                iwl3945_tx_cmd_complete(priv, rxb);
                        else
                                IWL_WARNING("Claim null rxb?\n");
                }

                /* For now we just don't re-use anything.  We can tweak this
                 * later to try and re-use notification packets and SKBs that
                 * fail to Rx correctly */
                if (rxb->skb != NULL) {
                        priv->alloc_rxb_skb--;
                        dev_kfree_skb_any(rxb->skb);
                        rxb->skb = NULL;
                }

                pci_unmap_single(priv->pci_dev, rxb->dma_addr,
                                 IWL_RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
                spin_lock_irqsave(&rxq->lock, flags);
                list_add_tail(&rxb->list, &priv->rxq.rx_used);
                spin_unlock_irqrestore(&rxq->lock, flags);
                i = (i + 1) & RX_QUEUE_MASK;
                /* If there are a lot of unused frames,
                 * restock the Rx queue so ucode won't assert. */
                if (fill_rx) {
                        count++;
                        if (count >= 8) {
                                priv->rxq.read = i;
                                __iwl3945_rx_replenish(priv);
                                count = 0;
                        }
                }
        }

        /* Backtrack one entry */
        priv->rxq.read = i;
        iwl3945_rx_queue_restock(priv);
}

/**
 * iwl3945_tx_queue_update_write_ptr - Send new write index to hardware
 */
static int iwl3945_tx_queue_update_write_ptr(struct iwl3945_priv *priv,
                                  struct iwl3945_tx_queue *txq)
{
        u32 reg = 0;
        int rc = 0;
        int txq_id = txq->q.id;

        if (txq->need_update == 0)
                return rc;

        /* if we're trying to save power */
        if (test_bit(STATUS_POWER_PMI, &priv->status)) {
                /* wake up nic if it's powered down ...
                 * uCode will wake up, and interrupt us again, so next
                 * time we'll skip this part. */
                reg = iwl3945_read32(priv, CSR_UCODE_DRV_GP1);

                if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
                        IWL_DEBUG_INFO("Requesting wakeup, GP1 = 0x%x\n", reg);
                        iwl3945_set_bit(priv, CSR_GP_CNTRL,
                                    CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
                        return rc;
                }

                /* restore this queue's parameters in nic hardware. */
                rc = iwl3945_grab_nic_access(priv);
                if (rc)
                        return rc;
                iwl3945_write_direct32(priv, HBUS_TARG_WRPTR,
                                     txq->q.write_ptr | (txq_id << 8));
                iwl3945_release_nic_access(priv);

        /* else not in power-save mode, uCode will never sleep when we're
         * trying to tx (during RFKILL, we're not trying to tx). */
        } else
                iwl3945_write32(priv, HBUS_TARG_WRPTR,
                            txq->q.write_ptr | (txq_id << 8));

        txq->need_update = 0;

        return rc;
}

#ifdef CONFIG_IWL3945_DEBUG
static void iwl3945_print_rx_config_cmd(struct iwl3945_rxon_cmd *rxon)
{
        IWL_DEBUG_RADIO("RX CONFIG:\n");
        iwl3945_print_hex_dump(IWL_DL_RADIO, (u8 *) rxon, sizeof(*rxon));
        IWL_DEBUG_RADIO("u16 channel: 0x%x\n", le16_to_cpu(rxon->channel));
        IWL_DEBUG_RADIO("u32 flags: 0x%08X\n", le32_to_cpu(rxon->flags));
        IWL_DEBUG_RADIO("u32 filter_flags: 0x%08x\n",
                        le32_to_cpu(rxon->filter_flags));
        IWL_DEBUG_RADIO("u8 dev_type: 0x%x\n", rxon->dev_type);
        IWL_DEBUG_RADIO("u8 ofdm_basic_rates: 0x%02x\n",
                        rxon->ofdm_basic_rates);
        IWL_DEBUG_RADIO("u8 cck_basic_rates: 0x%02x\n", rxon->cck_basic_rates);
        IWL_DEBUG_RADIO("u8[6] node_addr: %pM\n", rxon->node_addr);
        IWL_DEBUG_RADIO("u8[6] bssid_addr: %pM\n", rxon->bssid_addr);
        IWL_DEBUG_RADIO("u16 assoc_id: 0x%x\n", le16_to_cpu(rxon->assoc_id));
}
#endif

static void iwl3945_enable_interrupts(struct iwl3945_priv *priv)
{
        IWL_DEBUG_ISR("Enabling interrupts\n");
        set_bit(STATUS_INT_ENABLED, &priv->status);
        iwl3945_write32(priv, CSR_INT_MASK, CSR_INI_SET_MASK);
}


/* call this function to flush any scheduled tasklet */
static inline void iwl_synchronize_irq(struct iwl3945_priv *priv)
{
        /* wait to make sure we flush pending tasklet*/
        synchronize_irq(priv->pci_dev->irq);
        tasklet_kill(&priv->irq_tasklet);
}


static inline void iwl3945_disable_interrupts(struct iwl3945_priv *priv)
{
        clear_bit(STATUS_INT_ENABLED, &priv->status);

        /* disable interrupts from uCode/NIC to host */
        iwl3945_write32(priv, CSR_INT_MASK, 0x00000000);

        /* acknowledge/clear/reset any interrupts still pending
         * from uCode or flow handler (Rx/Tx DMA) */
        iwl3945_write32(priv, CSR_INT, 0xffffffff);
        iwl3945_write32(priv, CSR_FH_INT_STATUS, 0xffffffff);
        IWL_DEBUG_ISR("Disabled interrupts\n");
}

static const char *desc_lookup(int i)
{
        switch (i) {
        case 1:
                return "FAIL";
        case 2:
                return "BAD_PARAM";
        case 3:
                return "BAD_CHECKSUM";
        case 4:
                return "NMI_INTERRUPT";
        case 5:
                return "SYSASSERT";
        case 6:
                return "FATAL_ERROR";
        }

        return "UNKNOWN";
}

#define ERROR_START_OFFSET  (1 * sizeof(u32))
#define ERROR_ELEM_SIZE     (7 * sizeof(u32))

static void iwl3945_dump_nic_error_log(struct iwl3945_priv *priv)
{
        u32 i;
        u32 desc, time, count, base, data1;
        u32 blink1, blink2, ilink1, ilink2;
        int rc;

        base = le32_to_cpu(priv->card_alive.error_event_table_ptr);

        if (!iwl3945_hw_valid_rtc_data_addr(base)) {
                IWL_ERROR("Not valid error log pointer 0x%08X\n", base);
                return;
        }

        rc = iwl3945_grab_nic_access(priv);
        if (rc) {
                IWL_WARNING("Can not read from adapter at this time.\n");
                return;
        }

        count = iwl3945_read_targ_mem(priv, base);

        if (ERROR_START_OFFSET <= count * ERROR_ELEM_SIZE) {
                IWL_ERROR("Start IWL Error Log Dump:\n");
                IWL_ERROR("Status: 0x%08lX, count: %d\n", priv->status, count);
        }

        IWL_ERROR("Desc       Time       asrtPC  blink2 "
                  "ilink1  nmiPC   Line\n");
        for (i = ERROR_START_OFFSET;
             i < (count * ERROR_ELEM_SIZE) + ERROR_START_OFFSET;
             i += ERROR_ELEM_SIZE) {
                desc = iwl3945_read_targ_mem(priv, base + i);
                time =
                    iwl3945_read_targ_mem(priv, base + i + 1 * sizeof(u32));
                blink1 =
                    iwl3945_read_targ_mem(priv, base + i + 2 * sizeof(u32));
                blink2 =
                    iwl3945_read_targ_mem(priv, base + i + 3 * sizeof(u32));
                ilink1 =
                    iwl3945_read_targ_mem(priv, base + i + 4 * sizeof(u32));
                ilink2 =
                    iwl3945_read_targ_mem(priv, base + i + 5 * sizeof(u32));
                data1 =
                    iwl3945_read_targ_mem(priv, base + i + 6 * sizeof(u32));

                IWL_ERROR
                    ("%-13s (#%d) %010u 0x%05X 0x%05X 0x%05X 0x%05X %u\n\n",
                     desc_lookup(desc), desc, time, blink1, blink2,
                     ilink1, ilink2, data1);
        }

        iwl3945_release_nic_access(priv);

}

#define EVENT_START_OFFSET  (6 * sizeof(u32))

/**
 * iwl3945_print_event_log - Dump error event log to syslog
 *
 * NOTE: Must be called with iwl3945_grab_nic_access() already obtained!
 */
static void iwl3945_print_event_log(struct iwl3945_priv *priv, u32 start_idx,
                                u32 num_events, u32 mode)
{
        u32 i;
        u32 base;       /* SRAM byte address of event log header */
        u32 event_size; /* 2 u32s, or 3 u32s if timestamp recorded */
        u32 ptr;        /* SRAM byte address of log data */
        u32 ev, time, data; /* event log data */

        if (num_events == 0)
                return;

        base = le32_to_cpu(priv->card_alive.log_event_table_ptr);

        if (mode == 0)
                event_size = 2 * sizeof(u32);
        else
                event_size = 3 * sizeof(u32);

        ptr = base + EVENT_START_OFFSET + (start_idx * event_size);

        /* "time" is actually "data" for mode 0 (no timestamp).
         * place event id # at far right for easier visual parsing. */
        for (i = 0; i < num_events; i++) {
                ev = iwl3945_read_targ_mem(priv, ptr);
                ptr += sizeof(u32);
                time = iwl3945_read_targ_mem(priv, ptr);
                ptr += sizeof(u32);
                if (mode == 0)
                        IWL_ERROR("0x%08x\t%04u\n", time, ev); /* data, ev */
                else {
                        data = iwl3945_read_targ_mem(priv, ptr);
                        ptr += sizeof(u32);
                        IWL_ERROR("%010u\t0x%08x\t%04u\n", time, data, ev);
                }
        }
}

static void iwl3945_dump_nic_event_log(struct iwl3945_priv *priv)
{
        int rc;
        u32 base;       /* SRAM byte address of event log header */
        u32 capacity;   /* event log capacity in # entries */
        u32 mode;       /* 0 - no timestamp, 1 - timestamp recorded */
        u32 num_wraps;  /* # times uCode wrapped to top of log */
        u32 next_entry; /* index of next entry to be written by uCode */
        u32 size;       /* # entries that we'll print */

        base = le32_to_cpu(priv->card_alive.log_event_table_ptr);
        if (!iwl3945_hw_valid_rtc_data_addr(base)) {
                IWL_ERROR("Invalid event log pointer 0x%08X\n", base);
                return;
        }

        rc = iwl3945_grab_nic_access(priv);
        if (rc) {
                IWL_WARNING("Can not read from adapter at this time.\n");
                return;
        }

        /* event log header */
        capacity = iwl3945_read_targ_mem(priv, base);
        mode = iwl3945_read_targ_mem(priv, base + (1 * sizeof(u32)));
        num_wraps = iwl3945_read_targ_mem(priv, base + (2 * sizeof(u32)));
        next_entry = iwl3945_read_targ_mem(priv, base + (3 * sizeof(u32)));

        size = num_wraps ? capacity : next_entry;

        /* bail out if nothing in log */
        if (size == 0) {
                IWL_ERROR("Start IWL Event Log Dump: nothing in log\n");
                iwl3945_release_nic_access(priv);
                return;
        }

        IWL_ERROR("Start IWL Event Log Dump: display count %d, wraps %d\n",
                  size, num_wraps);

        /* if uCode has wrapped back to top of log, start at the oldest entry,
         * i.e the next one that uCode would fill. */
        if (num_wraps)
                iwl3945_print_event_log(priv, next_entry,
                                    capacity - next_entry, mode);

        /* (then/else) start at top of log */
        iwl3945_print_event_log(priv, 0, next_entry, mode);

        iwl3945_release_nic_access(priv);
}

/**
 * iwl3945_irq_handle_error - called for HW or SW error interrupt from card
 */
static void iwl3945_irq_handle_error(struct iwl3945_priv *priv)
{
        /* Set the FW error flag -- cleared on iwl3945_down */
        set_bit(STATUS_FW_ERROR, &priv->status);

        /* Cancel currently queued command. */
        clear_bit(STATUS_HCMD_ACTIVE, &priv->status);

#ifdef CONFIG_IWL3945_DEBUG
        if (iwl3945_debug_level & IWL_DL_FW_ERRORS) {
                iwl3945_dump_nic_error_log(priv);
                iwl3945_dump_nic_event_log(priv);
                iwl3945_print_rx_config_cmd(&priv->staging_rxon);
        }
#endif

        wake_up_interruptible(&priv->wait_command_queue);

        /* Keep the restart process from trying to send host
         * commands by clearing the INIT status bit */
        clear_bit(STATUS_READY, &priv->status);

        if (!test_bit(STATUS_EXIT_PENDING, &priv->status)) {
                IWL_DEBUG(IWL_DL_INFO | IWL_DL_FW_ERRORS,
                          "Restarting adapter due to uCode error.\n");

                if (iwl3945_is_associated(priv)) {
                        memcpy(&priv->recovery_rxon, &priv->active_rxon,
                               sizeof(priv->recovery_rxon));
                        priv->error_recovering = 1;
                }
                queue_work(priv->workqueue, &priv->restart);
        }
}

static void iwl3945_error_recovery(struct iwl3945_priv *priv)
{
        unsigned long flags;

        memcpy(&priv->staging_rxon, &priv->recovery_rxon,
               sizeof(priv->staging_rxon));
        priv->staging_rxon.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
        iwl3945_commit_rxon(priv);

        iwl3945_add_station(priv, priv->bssid, 1, 0);

        spin_lock_irqsave(&priv->lock, flags);
        priv->assoc_id = le16_to_cpu(priv->staging_rxon.assoc_id);
        priv->error_recovering = 0;
        spin_unlock_irqrestore(&priv->lock, flags);
}

static void iwl3945_irq_tasklet(struct iwl3945_priv *priv)
{
        u32 inta, handled = 0;
        u32 inta_fh;
        unsigned long flags;
#ifdef CONFIG_IWL3945_DEBUG
        u32 inta_mask;
#endif

        spin_lock_irqsave(&priv->lock, flags);

        /* Ack/clear/reset pending uCode interrupts.
         * Note:  Some bits in CSR_INT are "OR" of bits in CSR_FH_INT_STATUS,
         *  and will clear only when CSR_FH_INT_STATUS gets cleared. */
        inta = iwl3945_read32(priv, CSR_INT);
        iwl3945_write32(priv, CSR_INT, inta);

        /* Ack/clear/reset pending flow-handler (DMA) interrupts.
         * Any new interrupts that happen after this, either while we're
         * in this tasklet, or later, will show up in next ISR/tasklet. */
        inta_fh = iwl3945_read32(priv, CSR_FH_INT_STATUS);
        iwl3945_write32(priv, CSR_FH_INT_STATUS, inta_fh);

#ifdef CONFIG_IWL3945_DEBUG
        if (iwl3945_debug_level & IWL_DL_ISR) {
                /* just for debug */
                inta_mask = iwl3945_read32(priv, CSR_INT_MASK);
                IWL_DEBUG_ISR("inta 0x%08x, enabled 0x%08x, fh 0x%08x\n",
                              inta, inta_mask, inta_fh);
        }
#endif

        /* Since CSR_INT and CSR_FH_INT_STATUS reads and clears are not
         * atomic, make sure that inta covers all the interrupts that
         * we've discovered, even if FH interrupt came in just after
         * reading CSR_INT. */
        if (inta_fh & CSR39_FH_INT_RX_MASK)
                inta |= CSR_INT_BIT_FH_RX;
        if (inta_fh & CSR39_FH_INT_TX_MASK)
                inta |= CSR_INT_BIT_FH_TX;

        /* Now service all interrupt bits discovered above. */
        if (inta & CSR_INT_BIT_HW_ERR) {
                IWL_ERROR("Microcode HW error detected.  Restarting.\n");

                /* Tell the device to stop sending interrupts */
                iwl3945_disable_interrupts(priv);

                iwl3945_irq_handle_error(priv);

                handled |= CSR_INT_BIT_HW_ERR;

                spin_unlock_irqrestore(&priv->lock, flags);

                return;
        }

#ifdef CONFIG_IWL3945_DEBUG
        if (iwl3945_debug_level & (IWL_DL_ISR)) {
                /* NIC fires this, but we don't use it, redundant with WAKEUP */
                if (inta & CSR_INT_BIT_SCD)
                        IWL_DEBUG_ISR("Scheduler finished to transmit "
                                      "the frame/frames.\n");

                /* Alive notification via Rx interrupt will do the real work */
                if (inta & CSR_INT_BIT_ALIVE)
                        IWL_DEBUG_ISR("Alive interrupt\n");
        }
#endif
        /* Safely ignore these bits for debug checks below */
        inta &= ~(CSR_INT_BIT_SCD | CSR_INT_BIT_ALIVE);

        /* Error detected by uCode */
        if (inta & CSR_INT_BIT_SW_ERR) {
                IWL_ERROR("Microcode SW error detected.  Restarting 0x%X.\n",
                          inta);
                iwl3945_irq_handle_error(priv);
                handled |= CSR_INT_BIT_SW_ERR;
        }

        /* uCode wakes up after power-down sleep */
        if (inta & CSR_INT_BIT_WAKEUP) {
                IWL_DEBUG_ISR("Wakeup interrupt\n");
                iwl3945_rx_queue_update_write_ptr(priv, &priv->rxq);
                iwl3945_tx_queue_update_write_ptr(priv, &priv->txq[0]);
                iwl3945_tx_queue_update_write_ptr(priv, &priv->txq[1]);
                iwl3945_tx_queue_update_write_ptr(priv, &priv->txq[2]);
                iwl3945_tx_queue_update_write_ptr(priv, &priv->txq[3]);
                iwl3945_tx_queue_update_write_ptr(priv, &priv->txq[4]);
                iwl3945_tx_queue_update_write_ptr(priv, &priv->txq[5]);

                handled |= CSR_INT_BIT_WAKEUP;
        }

        /* All uCode command responses, including Tx command responses,
         * Rx "responses" (frame-received notification), and other
         * notifications from uCode come through here*/
        if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX)) {
                iwl3945_rx_handle(priv);
                handled |= (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX);
        }

        if (inta & CSR_INT_BIT_FH_TX) {
                IWL_DEBUG_ISR("Tx interrupt\n");

                iwl3945_write32(priv, CSR_FH_INT_STATUS, (1 << 6));
                if (!iwl3945_grab_nic_access(priv)) {
                        iwl3945_write_direct32(priv,
                                             FH_TCSR_CREDIT
                                             (ALM_FH_SRVC_CHNL), 0x0);
                        iwl3945_release_nic_access(priv);
                }
                handled |= CSR_INT_BIT_FH_TX;
        }

        if (inta & ~handled)
                IWL_ERROR("Unhandled INTA bits 0x%08x\n", inta & ~handled);

        if (inta & ~CSR_INI_SET_MASK) {
                IWL_WARNING("Disabled INTA bits 0x%08x were pending\n",
                         inta & ~CSR_INI_SET_MASK);
                IWL_WARNING("   with FH_INT = 0x%08x\n", inta_fh);
        }

        /* Re-enable all interrupts */
        /* only Re-enable if disabled by irq */
        if (test_bit(STATUS_INT_ENABLED, &priv->status))
                iwl3945_enable_interrupts(priv);

#ifdef CONFIG_IWL3945_DEBUG
        if (iwl3945_debug_level & (IWL_DL_ISR)) {
                inta = iwl3945_read32(priv, CSR_INT);
                inta_mask = iwl3945_read32(priv, CSR_INT_MASK);
                inta_fh = iwl3945_read32(priv, CSR_FH_INT_STATUS);
                IWL_DEBUG_ISR("End inta 0x%08x, enabled 0x%08x, fh 0x%08x, "
                        "flags 0x%08lx\n", inta, inta_mask, inta_fh, flags);
        }
#endif
        spin_unlock_irqrestore(&priv->lock, flags);
}

static irqreturn_t iwl3945_isr(int irq, void *data)
{
        struct iwl3945_priv *priv = data;
        u32 inta, inta_mask;
        u32 inta_fh;
        if (!priv)
                return IRQ_NONE;

        spin_lock(&priv->lock);

        /* Disable (but don't clear!) interrupts here to avoid
         *    back-to-back ISRs and sporadic interrupts from our NIC.
         * If we have something to service, the tasklet will re-enable ints.
         * If we *don't* have something, we'll re-enable before leaving here. */
        inta_mask = iwl3945_read32(priv, CSR_INT_MASK);  /* just for debug */
        iwl3945_write32(priv, CSR_INT_MASK, 0x00000000);

        /* Discover which interrupts are active/pending */
        inta = iwl3945_read32(priv, CSR_INT);
        inta_fh = iwl3945_read32(priv, CSR_FH_INT_STATUS);

        /* Ignore interrupt if there's nothing in NIC to service.
         * This may be due to IRQ shared with another device,
         * or due to sporadic interrupts thrown from our NIC. */
        if (!inta && !inta_fh) {
                IWL_DEBUG_ISR("Ignore interrupt, inta == 0, inta_fh == 0\n");
                goto none;
        }

        if ((inta == 0xFFFFFFFF) || ((inta & 0xFFFFFFF0) == 0xa5a5a5a0)) {
                /* Hardware disappeared */
                IWL_WARNING("HARDWARE GONE?? INTA == 0x%080x\n", inta);
                goto unplugged;
        }

        IWL_DEBUG_ISR("ISR inta 0x%08x, enabled 0x%08x, fh 0x%08x\n",
                      inta, inta_mask, inta_fh);

        inta &= ~CSR_INT_BIT_SCD;

        /* iwl3945_irq_tasklet() will service interrupts and re-enable them */
        if (likely(inta || inta_fh))
                tasklet_schedule(&priv->irq_tasklet);
unplugged:
        spin_unlock(&priv->lock);

        return IRQ_HANDLED;

 none:
        /* re-enable interrupts here since we don't have anything to service. */
        /* only Re-enable if disabled by irq */
        if (test_bit(STATUS_INT_ENABLED, &priv->status))
                iwl3945_enable_interrupts(priv);
        spin_unlock(&priv->lock);
        return IRQ_NONE;
}

/************************** EEPROM BANDS ****************************
 *
 * The iwl3945_eeprom_band definitions below provide the mapping from the
 * EEPROM contents to the specific channel number supported for each
 * band.
 *
 * For example, iwl3945_priv->eeprom.band_3_channels[4] from the band_3
 * definition below maps to physical channel 42 in the 5.2GHz spectrum.
 * The specific geography and calibration information for that channel
 * is contained in the eeprom map itself.
 *
 * During init, we copy the eeprom information and channel map
 * information into priv->channel_info_24/52 and priv->channel_map_24/52
 *
 * channel_map_24/52 provides the index in the channel_info array for a
 * given channel.  We have to have two separate maps as there is channel
 * overlap with the 2.4GHz and 5.2GHz spectrum as seen in band_1 and
 * band_2
 *
 * A value of 0xff stored in the channel_map indicates that the channel
 * is not supported by the hardware at all.
 *
 * A value of 0xfe in the channel_map indicates that the channel is not
 * valid for Tx with the current hardware.  This means that
 * while the system can tune and receive on a given channel, it may not
 * be able to associate or transmit any frames on that
 * channel.  There is no corresponding channel information for that
 * entry.
 *
 *********************************************************************/

/* 2.4 GHz */
static const u8 iwl3945_eeprom_band_1[14] = {
        1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
};

/* 5.2 GHz bands */
static const u8 iwl3945_eeprom_band_2[] = {     /* 4915-5080MHz */
        183, 184, 185, 187, 188, 189, 192, 196, 7, 8, 11, 12, 16
};

static const u8 iwl3945_eeprom_band_3[] = {     /* 5170-5320MHz */
        34, 36, 38, 40, 42, 44, 46, 48, 52, 56, 60, 64
};

static const u8 iwl3945_eeprom_band_4[] = {     /* 5500-5700MHz */
        100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140
};

static const u8 iwl3945_eeprom_band_5[] = {     /* 5725-5825MHz */
        145, 149, 153, 157, 161, 165
};

static void iwl3945_init_band_reference(const struct iwl3945_priv *priv, int band,
                                    int *eeprom_ch_count,
                                    const struct iwl3945_eeprom_channel
                                    **eeprom_ch_info,
                                    const u8 **eeprom_ch_index)
{
        switch (band) {
        case 1:         /* 2.4GHz band */
                *eeprom_ch_count = ARRAY_SIZE(iwl3945_eeprom_band_1);
                *eeprom_ch_info = priv->eeprom.band_1_channels;
                *eeprom_ch_index = iwl3945_eeprom_band_1;
                break;
        case 2:         /* 4.9GHz band */
                *eeprom_ch_count = ARRAY_SIZE(iwl3945_eeprom_band_2);
                *eeprom_ch_info = priv->eeprom.band_2_channels;
                *eeprom_ch_index = iwl3945_eeprom_band_2;
                break;
        case 3:         /* 5.2GHz band */
                *eeprom_ch_count = ARRAY_SIZE(iwl3945_eeprom_band_3);
                *eeprom_ch_info = priv->eeprom.band_3_channels;
                *eeprom_ch_index = iwl3945_eeprom_band_3;
                break;
        case 4:         /* 5.5GHz band */
                *eeprom_ch_count = ARRAY_SIZE(iwl3945_eeprom_band_4);
                *eeprom_ch_info = priv->eeprom.band_4_channels;
                *eeprom_ch_index = iwl3945_eeprom_band_4;
                break;
        case 5:         /* 5.7GHz band */
                *eeprom_ch_count = ARRAY_SIZE(iwl3945_eeprom_band_5);
                *eeprom_ch_info = priv->eeprom.band_5_channels;
                *eeprom_ch_index = iwl3945_eeprom_band_5;
                break;
        default:
                BUG();
                return;
        }
}

/**
 * iwl3945_get_channel_info - Find driver's private channel info
 *
 * Based on band and channel number.
 */
const struct iwl3945_channel_info *iwl3945_get_channel_info(const struct iwl3945_priv *priv,
                                                    enum ieee80211_band band, u16 channel)
{
        int i;

        switch (band) {
        case IEEE80211_BAND_5GHZ:
                for (i = 14; i < priv->channel_count; i++) {
                        if (priv->channel_info[i].channel == channel)
                                return &priv->channel_info[i];
                }
                break;

        case IEEE80211_BAND_2GHZ:
                if (channel >= 1 && channel <= 14)
                        return &priv->channel_info[channel - 1];
                break;
        case IEEE80211_NUM_BANDS:
                WARN_ON(1);
        }

        return NULL;
}

#define CHECK_AND_PRINT(x) ((eeprom_ch_info[ch].flags & EEPROM_CHANNEL_##x) \
                            ? # x " " : "")

/**
 * iwl3945_init_channel_map - Set up driver's info for all possible channels
 */
static int iwl3945_init_channel_map(struct iwl3945_priv *priv)
{
        int eeprom_ch_count = 0;
        const u8 *eeprom_ch_index = NULL;
        const struct iwl3945_eeprom_channel *eeprom_ch_info = NULL;
        int band, ch;
        struct iwl3945_channel_info *ch_info;

        if (priv->channel_count) {
                IWL_DEBUG_INFO("Channel map already initialized.\n");
                return 0;
        }

        if (priv->eeprom.version < 0x2f) {
                IWL_WARNING("Unsupported EEPROM version: 0x%04X\n",
                            priv->eeprom.version);
                return -EINVAL;
        }

        IWL_DEBUG_INFO("Initializing regulatory info from EEPROM\n");

        priv->channel_count =
            ARRAY_SIZE(iwl3945_eeprom_band_1) +
            ARRAY_SIZE(iwl3945_eeprom_band_2) +
            ARRAY_SIZE(iwl3945_eeprom_band_3) +
            ARRAY_SIZE(iwl3945_eeprom_band_4) +
            ARRAY_SIZE(iwl3945_eeprom_band_5);

        IWL_DEBUG_INFO("Parsing data for %d channels.\n", priv->channel_count);

        priv->channel_info = kzalloc(sizeof(struct iwl3945_channel_info) *
                                     priv->channel_count, GFP_KERNEL);
        if (!priv->channel_info) {
                IWL_ERROR("Could not allocate channel_info\n");
                priv->channel_count = 0;
                return -ENOMEM;
        }

        ch_info = priv->channel_info;

        /* Loop through the 5 EEPROM bands adding them in order to the
         * channel map we maintain (that contains additional information than
         * what just in the EEPROM) */
        for (band = 1; band <= 5; band++) {

                iwl3945_init_band_reference(priv, band, &eeprom_ch_count,
                                        &eeprom_ch_info, &eeprom_ch_index);

                /* Loop through each band adding each of the channels */
                for (ch = 0; ch < eeprom_ch_count; ch++) {
                        ch_info->channel = eeprom_ch_index[ch];
                        ch_info->band = (band == 1) ? IEEE80211_BAND_2GHZ :
                            IEEE80211_BAND_5GHZ;

                        /* permanently store EEPROM's channel regulatory flags
                         *   and max power in channel info database. */
                        ch_info->eeprom = eeprom_ch_info[ch];

                        /* Copy the run-time flags so they are there even on
                         * invalid channels */
                        ch_info->flags = eeprom_ch_info[ch].flags;

                        if (!(is_channel_valid(ch_info))) {
                                IWL_DEBUG_INFO("Ch. %d Flags %x [%sGHz] - "
                                               "No traffic\n",
                                               ch_info->channel,
                                               ch_info->flags,
                                               is_channel_a_band(ch_info) ?
                                               "5.2" : "2.4");
                                ch_info++;
                                continue;
                        }

                        /* Initialize regulatory-based run-time data */
                        ch_info->max_power_avg = ch_info->curr_txpow =
                            eeprom_ch_info[ch].max_power_avg;
                        ch_info->scan_power = eeprom_ch_info[ch].max_power_avg;
                        ch_info->min_power = 0;

                        IWL_DEBUG_INFO("Ch. %d [%sGHz] %s%s%s%s%s%s(0x%02x"
                                       " %ddBm): Ad-Hoc %ssupported\n",
                                       ch_info->channel,
                                       is_channel_a_band(ch_info) ?
                                       "5.2" : "2.4",
                                       CHECK_AND_PRINT(VALID),
                                       CHECK_AND_PRINT(IBSS),
                                       CHECK_AND_PRINT(ACTIVE),
                                       CHECK_AND_PRINT(RADAR),
                                       CHECK_AND_PRINT(WIDE),
                                       CHECK_AND_PRINT(DFS),
                                       eeprom_ch_info[ch].flags,
                                       eeprom_ch_info[ch].max_power_avg,
                                       ((eeprom_ch_info[ch].
                                         flags & EEPROM_CHANNEL_IBSS)
                                        && !(eeprom_ch_info[ch].
                                             flags & EEPROM_CHANNEL_RADAR))
                                       ? "" : "not ");

                        /* Set the user_txpower_limit to the highest power
                         * supported by any channel */
                        if (eeprom_ch_info[ch].max_power_avg >
                            priv->user_txpower_limit)
                                priv->user_txpower_limit =
                                    eeprom_ch_info[ch].max_power_avg;

                        ch_info++;
                }
        }

        /* Set up txpower settings in driver for all channels */
        if (iwl3945_txpower_set_from_eeprom(priv))
                return -EIO;

        return 0;
}

/*
 * iwl3945_free_channel_map - undo allocations in iwl3945_init_channel_map
 */
static void iwl3945_free_channel_map(struct iwl3945_priv *priv)
{
        kfree(priv->channel_info);
        priv->channel_count = 0;
}

/* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
 * sending probe req.  This should be set long enough to hear probe responses
 * from more than one AP.  */
#define IWL_ACTIVE_DWELL_TIME_24    (30)        /* all times in msec */
#define IWL_ACTIVE_DWELL_TIME_52    (20)

#define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
#define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)

/* For faster active scanning, scan will move to the next channel if fewer than
 * PLCP_QUIET_THRESH packets are heard on this channel within
 * ACTIVE_QUIET_TIME after sending probe request.  This shortens the dwell
 * time if it's a quiet channel (nothing responded to our probe, and there's
 * no other traffic).
 * Disable "quiet" feature by setting PLCP_QUIET_THRESH to 0. */
#define IWL_PLCP_QUIET_THRESH       __constant_cpu_to_le16(1)   /* packets */
#define IWL_ACTIVE_QUIET_TIME       __constant_cpu_to_le16(10)  /* msec */

/* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
 * Must be set longer than active dwell time.
 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
#define IWL_PASSIVE_DWELL_TIME_24   (20)        /* all times in msec */
#define IWL_PASSIVE_DWELL_TIME_52   (10)
#define IWL_PASSIVE_DWELL_BASE      (100)
#define IWL_CHANNEL_TUNE_TIME       5

#define IWL_SCAN_PROBE_MASK(n)   (BIT(n) | (BIT(n) - BIT(1)))

static inline u16 iwl3945_get_active_dwell_time(struct iwl3945_priv *priv,
                                                enum ieee80211_band band,
                                                u8 n_probes)
{
        if (band == IEEE80211_BAND_5GHZ)
                return IWL_ACTIVE_DWELL_TIME_52 +
                        IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
        else
                return IWL_ACTIVE_DWELL_TIME_24 +
                        IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
}

static u16 iwl3945_get_passive_dwell_time(struct iwl3945_priv *priv,
                                          enum ieee80211_band band)
{
        u16 passive = (band == IEEE80211_BAND_2GHZ) ?
            IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
            IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;

        if (iwl3945_is_associated(priv)) {
                /* If we're associated, we clamp the maximum passive
                 * dwell time to be 98% of the beacon interval (minus
                 * 2 * channel tune time) */
                passive = priv->beacon_int;
                if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
                        passive = IWL_PASSIVE_DWELL_BASE;
                passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
        }

        return passive;
}

static int iwl3945_get_channels_for_scan(struct iwl3945_priv *priv,
                                         enum ieee80211_band band,
                                     u8 is_active, u8 n_probes,
                                     struct iwl3945_scan_channel *scan_ch)
{
        const struct ieee80211_channel *channels = NULL;
        const struct ieee80211_supported_band *sband;
        const struct iwl3945_channel_info *ch_info;
        u16 passive_dwell = 0;
        u16 active_dwell = 0;
        int added, i;

        sband = iwl3945_get_band(priv, band);
        if (!sband)
                return 0;

        channels = sband->channels;

        active_dwell = iwl3945_get_active_dwell_time(priv, band, n_probes);
        passive_dwell = iwl3945_get_passive_dwell_time(priv, band);

        if (passive_dwell <= active_dwell)
                passive_dwell = active_dwell + 1;

        for (i = 0, added = 0; i < sband->n_channels; i++) {
                if (channels[i].flags & IEEE80211_CHAN_DISABLED)
                        continue;

                scan_ch->channel = channels[i].hw_value;

                ch_info = iwl3945_get_channel_info(priv, band, scan_ch->channel);
                if (!is_channel_valid(ch_info)) {
                        IWL_DEBUG_SCAN("Channel %d is INVALID for this band.\n",
                                       scan_ch->channel);
                        continue;
                }

                if (!is_active || is_channel_passive(ch_info) ||
                    (channels[i].flags & IEEE80211_CHAN_PASSIVE_SCAN))
                        scan_ch->type = 0;      /* passive */
                else
                        scan_ch->type = 1;      /* active */

                if ((scan_ch->type & 1) && n_probes)
                        scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);

                scan_ch->active_dwell = cpu_to_le16(active_dwell);
                scan_ch->passive_dwell = cpu_to_le16(passive_dwell);

                /* Set txpower levels to defaults */
                scan_ch->tpc.dsp_atten = 110;
                /* scan_pwr_info->tpc.dsp_atten; */

                /*scan_pwr_info->tpc.tx_gain; */
                if (band == IEEE80211_BAND_5GHZ)
                        scan_ch->tpc.tx_gain = ((1 << 5) | (3 << 3)) | 3;
                else {
                        scan_ch->tpc.tx_gain = ((1 << 5) | (5 << 3));
                        /* NOTE: if we were doing 6Mb OFDM for scans we'd use
                         * power level:
                         * scan_ch->tpc.tx_gain = ((1 << 5) | (2 << 3)) | 3;
                         */
                }

                IWL_DEBUG_SCAN("Scanning %d [%s %d]\n",
                               scan_ch->channel,
                               (scan_ch->type & 1) ? "ACTIVE" : "PASSIVE",
                               (scan_ch->type & 1) ?
                               active_dwell : passive_dwell);

                scan_ch++;
                added++;
        }

        IWL_DEBUG_SCAN("total channels to scan %d \n", added);
        return added;
}

static void iwl3945_init_hw_rates(struct iwl3945_priv *priv,
                              struct ieee80211_rate *rates)
{
        int i;

        for (i = 0; i < IWL_RATE_COUNT; i++) {
                rates[i].bitrate = iwl3945_rates[i].ieee * 5;
                rates[i].hw_value = i; /* Rate scaling will work on indexes */
                rates[i].hw_value_short = i;
                rates[i].flags = 0;
                if ((i > IWL_LAST_OFDM_RATE) || (i < IWL_FIRST_OFDM_RATE)) {
                        /*
                         * If CCK != 1M then set short preamble rate flag.
                         */
                        rates[i].flags |= (iwl3945_rates[i].plcp == 10) ?
                                0 : IEEE80211_RATE_SHORT_PREAMBLE;
                }
        }
}

/**
 * iwl3945_init_geos - Initialize mac80211's geo/channel info based from eeprom
 */
static int iwl3945_init_geos(struct iwl3945_priv *priv)
{
        struct iwl3945_channel_info *ch;
        struct ieee80211_supported_band *sband;
        struct ieee80211_channel *channels;
        struct ieee80211_channel *geo_ch;
        struct ieee80211_rate *rates;
        int i = 0;

        if (priv->bands[IEEE80211_BAND_2GHZ].n_bitrates ||
            priv->bands[IEEE80211_BAND_5GHZ].n_bitrates) {
                IWL_DEBUG_INFO("Geography modes already initialized.\n");
                set_bit(STATUS_GEO_CONFIGURED, &priv->status);
                return 0;
        }

        channels = kzalloc(sizeof(struct ieee80211_channel) *
                           priv->channel_count, GFP_KERNEL);
        if (!channels)
                return -ENOMEM;

        rates = kzalloc((sizeof(struct ieee80211_rate) * (IWL_RATE_COUNT + 1)),
                        GFP_KERNEL);
        if (!rates) {
                kfree(channels);
                return -ENOMEM;
        }

        /* 5.2GHz channels start after the 2.4GHz channels */
        sband = &priv->bands[IEEE80211_BAND_5GHZ];
        sband->channels = &channels[ARRAY_SIZE(iwl3945_eeprom_band_1)];
        /* just OFDM */
        sband->bitrates = &rates[IWL_FIRST_OFDM_RATE];
        sband->n_bitrates = IWL_RATE_COUNT - IWL_FIRST_OFDM_RATE;

        sband = &priv->bands[IEEE80211_BAND_2GHZ];
        sband->channels = channels;
        /* OFDM & CCK */
        sband->bitrates = rates;
        sband->n_bitrates = IWL_RATE_COUNT;

        priv->ieee_channels = channels;
        priv->ieee_rates = rates;

        iwl3945_init_hw_rates(priv, rates);

        for (i = 0;  i < priv->channel_count; i++) {
                ch = &priv->channel_info[i];

                /* FIXME: might be removed if scan is OK*/
                if (!is_channel_valid(ch))
                        continue;

                if (is_channel_a_band(ch))
                        sband =  &priv->bands[IEEE80211_BAND_5GHZ];
                else
                        sband =  &priv->bands[IEEE80211_BAND_2GHZ];

                geo_ch = &sband->channels[sband->n_channels++];

                geo_ch->center_freq = ieee80211_channel_to_frequency(ch->channel);
                geo_ch->max_power = ch->max_power_avg;
                geo_ch->max_antenna_gain = 0xff;
                geo_ch->hw_value = ch->channel;

                if (is_channel_valid(ch)) {
                        if (!(ch->flags & EEPROM_CHANNEL_IBSS))
                                geo_ch->flags |= IEEE80211_CHAN_NO_IBSS;

                        if (!(ch->flags & EEPROM_CHANNEL_ACTIVE))
                                geo_ch->flags |= IEEE80211_CHAN_PASSIVE_SCAN;

                        if (ch->flags & EEPROM_CHANNEL_RADAR)
                                geo_ch->flags |= IEEE80211_CHAN_RADAR;

                        if (ch->max_power_avg > priv->max_channel_txpower_limit)
                                priv->max_channel_txpower_limit =
                                    ch->max_power_avg;
                } else {
                        geo_ch->flags |= IEEE80211_CHAN_DISABLED;
                }

                /* Save flags for reg domain usage */
                geo_ch->orig_flags = geo_ch->flags;

                IWL_DEBUG_INFO("Channel %d Freq=%d[%sGHz] %s flag=0%X\n",
                                ch->channel, geo_ch->center_freq,
                                is_channel_a_band(ch) ?  "5.2" : "2.4",
                                geo_ch->flags & IEEE80211_CHAN_DISABLED ?
                                "restricted" : "valid",
                                 geo_ch->flags);
        }

        if ((priv->bands[IEEE80211_BAND_5GHZ].n_channels == 0) &&
             priv->cfg->sku & IWL_SKU_A) {
                printk(KERN_INFO DRV_NAME
                       ": Incorrectly detected BG card as ABG.  Please send "
                       "your PCI ID 0x%04X:0x%04X to maintainer.\n",
                       priv->pci_dev->device, priv->pci_dev->subsystem_device);
                 priv->cfg->sku &= ~IWL_SKU_A;
        }

        printk(KERN_INFO DRV_NAME
               ": Tunable channels: %d 802.11bg, %d 802.11a channels\n",
               priv->bands[IEEE80211_BAND_2GHZ].n_channels,
               priv->bands[IEEE80211_BAND_5GHZ].n_channels);

        if (priv->bands[IEEE80211_BAND_2GHZ].n_channels)
                priv->hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
                        &priv->bands[IEEE80211_BAND_2GHZ];
        if (priv->bands[IEEE80211_BAND_5GHZ].n_channels)
                priv->hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
                        &priv->bands[IEEE80211_BAND_5GHZ];

        set_bit(STATUS_GEO_CONFIGURED, &priv->status);

        return 0;
}

/*
 * iwl3945_free_geos - undo allocations in iwl3945_init_geos
 */
static void iwl3945_free_geos(struct iwl3945_priv *priv)
{
        kfree(priv->ieee_channels);
        kfree(priv->ieee_rates);
        clear_bit(STATUS_GEO_CONFIGURED, &priv->status);
}

/******************************************************************************
 *
 * uCode download functions
 *
 ******************************************************************************/

static void iwl3945_dealloc_ucode_pci(struct iwl3945_priv *priv)
{
        iwl_free_fw_desc(priv->pci_dev, &priv->ucode_code);
        iwl_free_fw_desc(priv->pci_dev, &priv->ucode_data);
        iwl_free_fw_desc(priv->pci_dev, &priv->ucode_data_backup);
        iwl_free_fw_desc(priv->pci_dev, &priv->ucode_init);
        iwl_free_fw_desc(priv->pci_dev, &priv->ucode_init_data);
        iwl_free_fw_desc(priv->pci_dev, &priv->ucode_boot);
}

/**
 * iwl3945_verify_inst_full - verify runtime uCode image in card vs. host,
 *     looking at all data.
 */
static int iwl3945_verify_inst_full(struct iwl3945_priv *priv, __le32 *image, u32 len)
{
        u32 val;
        u32 save_len = len;
        int rc = 0;
        u32 errcnt;

        IWL_DEBUG_INFO("ucode inst image size is %u\n", len);

        rc = iwl3945_grab_nic_access(priv);
        if (rc)
                return rc;

        iwl3945_write_direct32(priv, HBUS_TARG_MEM_RADDR, RTC_INST_LOWER_BOUND);

        errcnt = 0;
        for (; len > 0; len -= sizeof(u32), image++) {
                /* read data comes through single port, auto-incr addr */
                /* NOTE: Use the debugless read so we don't flood kernel log
                 * if IWL_DL_IO is set */
                val = _iwl3945_read_direct32(priv, HBUS_TARG_MEM_RDAT);
                if (val != le32_to_cpu(*image)) {
                        IWL_ERROR("uCode INST section is invalid at "
                                  "offset 0x%x, is 0x%x, s/b 0x%x\n",
                                  save_len - len, val, le32_to_cpu(*image));
                        rc = -EIO;
                        errcnt++;
                        if (errcnt >= 20)
                                break;
                }
        }

        iwl3945_release_nic_access(priv);

        if (!errcnt)
                IWL_DEBUG_INFO("ucode image in INSTRUCTION memory is good\n");

        return rc;
}


/**
 * iwl3945_verify_inst_sparse - verify runtime uCode image in card vs. host,
 *   using sample data 100 bytes apart.  If these sample points are good,
 *   it's a pretty good bet that everything between them is good, too.
 */
static int iwl3945_verify_inst_sparse(struct iwl3945_priv *priv, __le32 *image, u32 len)
{
        u32 val;
        int rc = 0;
        u32 errcnt = 0;
        u32 i;

        IWL_DEBUG_INFO("ucode inst image size is %u\n", len);

        rc = iwl3945_grab_nic_access(priv);
        if (rc)
                return rc;

        for (i = 0; i < len; i += 100, image += 100/sizeof(u32)) {
                /* read data comes through single port, auto-incr addr */
                /* NOTE: Use the debugless read so we don't flood kernel log
                 * if IWL_DL_IO is set */
                iwl3945_write_direct32(priv, HBUS_TARG_MEM_RADDR,
                        i + RTC_INST_LOWER_BOUND);
                val = _iwl3945_read_direct32(priv, HBUS_TARG_MEM_RDAT);
                if (val != le32_to_cpu(*image)) {
#if 0 /* Enable this if you want to see details */
                        IWL_ERROR("uCode INST section is invalid at "
                                  "offset 0x%x, is 0x%x, s/b 0x%x\n",
                                  i, val, *image);
#endif
                        rc = -EIO;
                        errcnt++;
                        if (errcnt >= 3)
                                break;
                }
        }

        iwl3945_release_nic_access(priv);

        return rc;
}


/**
 * iwl3945_verify_ucode - determine which instruction image is in SRAM,
 *    and verify its contents
 */
static int iwl3945_verify_ucode(struct iwl3945_priv *priv)
{
        __le32 *image;
        u32 len;
        int rc = 0;

        /* Try bootstrap */
        image = (__le32 *)priv->ucode_boot.v_addr;
        len = priv->ucode_boot.len;
        rc = iwl3945_verify_inst_sparse(priv, image, len);
        if (rc == 0) {
                IWL_DEBUG_INFO("Bootstrap uCode is good in inst SRAM\n");
                return 0;
        }

        /* Try initialize */
        image = (__le32 *)priv->ucode_init.v_addr;
        len = priv->ucode_init.len;
        rc = iwl3945_verify_inst_sparse(priv, image, len);
        if (rc == 0) {
                IWL_DEBUG_INFO("Initialize uCode is good in inst SRAM\n");
                return 0;
        }

        /* Try runtime/protocol */
        image = (__le32 *)priv->ucode_code.v_addr;
        len = priv->ucode_code.len;
        rc = iwl3945_verify_inst_sparse(priv, image, len);
        if (rc == 0) {
                IWL_DEBUG_INFO("Runtime uCode is good in inst SRAM\n");
                return 0;
        }

        IWL_ERROR("NO VALID UCODE IMAGE IN INSTRUCTION SRAM!!\n");

        /* Since nothing seems to match, show first several data entries in
         * instruction SRAM, so maybe visual inspection will give a clue.
         * Selection of bootstrap image (vs. other images) is arbitrary. */
        image = (__le32 *)priv->ucode_boot.v_addr;
        len = priv->ucode_boot.len;
        rc = iwl3945_verify_inst_full(priv, image, len);

        return rc;
}


/* check contents of special bootstrap uCode SRAM */
static int iwl3945_verify_bsm(struct iwl3945_priv *priv)
{
        __le32 *image = priv->ucode_boot.v_addr;
        u32 len = priv->ucode_boot.len;
        u32 reg;
        u32 val;

        IWL_DEBUG_INFO("Begin verify bsm\n");

        /* verify BSM SRAM contents */
        val = iwl3945_read_prph(priv, BSM_WR_DWCOUNT_REG);
        for (reg = BSM_SRAM_LOWER_BOUND;
             reg < BSM_SRAM_LOWER_BOUND + len;
             reg += sizeof(u32), image++) {
                val = iwl3945_read_prph(priv, reg);
                if (val != le32_to_cpu(*image)) {
                        IWL_ERROR("BSM uCode verification failed at "
                                  "addr 0x%08X+%u (of %u), is 0x%x, s/b 0x%x\n",
                                  BSM_SRAM_LOWER_BOUND,
                                  reg - BSM_SRAM_LOWER_BOUND, len,
                                  val, le32_to_cpu(*image));
                        return -EIO;
                }
        }

        IWL_DEBUG_INFO("BSM bootstrap uCode image OK\n");

        return 0;
}

/**
 * iwl3945_load_bsm - Load bootstrap instructions
 *
 * BSM operation:
 *
 * The Bootstrap State Machine (BSM) stores a short bootstrap uCode program
 * in special SRAM that does not power down during RFKILL.  When powering back
 * up after power-saving sleeps (or during initial uCode load), the BSM loads
 * the bootstrap program into the on-board processor, and starts it.
 *
 * The bootstrap program loads (via DMA) instructions and data for a new
 * program from host DRAM locations indicated by the host driver in the
 * BSM_DRAM_* registers.  Once the new program is loaded, it starts
 * automatically.
 *
 * When initializing the NIC, the host driver points the BSM to the
 * "initialize" uCode image.  This uCode sets up some internal data, then
 * notifies host via "initialize alive" that it is complete.
 *
 * The host then replaces the BSM_DRAM_* pointer values to point to the
 * normal runtime uCode instructions and a backup uCode data cache buffer
 * (filled initially with starting data values for the on-board processor),
 * then triggers the "initialize" uCode to load and launch the runtime uCode,
 * which begins normal operation.
 *
 * When doing a power-save shutdown, runtime uCode saves data SRAM into
 * the backup data cache in DRAM before SRAM is powered down.
 *
 * When powering back up, the BSM loads the bootstrap program.  This reloads
 * the runtime uCode instructions and the backup data cache into SRAM,
 * and re-launches the runtime uCode from where it left off.
 */
static int iwl3945_load_bsm(struct iwl3945_priv *priv)
{
        __le32 *image = priv->ucode_boot.v_addr;
        u32 len = priv->ucode_boot.len;
        dma_addr_t pinst;
        dma_addr_t pdata;
        u32 inst_len;
        u32 data_len;
        int rc;
        int i;
        u32 done;
        u32 reg_offset;

        IWL_DEBUG_INFO("Begin load bsm\n");

        /* make sure bootstrap program is no larger than BSM's SRAM size */
        if (len > IWL_MAX_BSM_SIZE)
                return -EINVAL;

        /* Tell bootstrap uCode where to find the "Initialize" uCode
         *   in host DRAM ... host DRAM physical address bits 31:0 for 3945.
         * NOTE:  iwl3945_initialize_alive_start() will replace these values,
         *        after the "initialize" uCode has run, to point to
         *        runtime/protocol instructions and backup data cache. */
        pinst = priv->ucode_init.p_addr;
        pdata = priv->ucode_init_data.p_addr;
        inst_len = priv->ucode_init.len;
        data_len = priv->ucode_init_data.len;

        rc = iwl3945_grab_nic_access(priv);
        if (rc)
                return rc;

        iwl3945_write_prph(priv, BSM_DRAM_INST_PTR_REG, pinst);
        iwl3945_write_prph(priv, BSM_DRAM_DATA_PTR_REG, pdata);
        iwl3945_write_prph(priv, BSM_DRAM_INST_BYTECOUNT_REG, inst_len);
        iwl3945_write_prph(priv, BSM_DRAM_DATA_BYTECOUNT_REG, data_len);

        /* Fill BSM memory with bootstrap instructions */
        for (reg_offset = BSM_SRAM_LOWER_BOUND;
             reg_offset < BSM_SRAM_LOWER_BOUND + len;
             reg_offset += sizeof(u32), image++)
                _iwl3945_write_prph(priv, reg_offset,
                                          le32_to_cpu(*image));

        rc = iwl3945_verify_bsm(priv);
        if (rc) {
                iwl3945_release_nic_access(priv);
                return rc;
        }

        /* Tell BSM to copy from BSM SRAM into instruction SRAM, when asked */
        iwl3945_write_prph(priv, BSM_WR_MEM_SRC_REG, 0x0);
        iwl3945_write_prph(priv, BSM_WR_MEM_DST_REG,
                                 RTC_INST_LOWER_BOUND);
        iwl3945_write_prph(priv, BSM_WR_DWCOUNT_REG, len / sizeof(u32));

        /* Load bootstrap code into instruction SRAM now,
         *   to prepare to load "initialize" uCode */
        iwl3945_write_prph(priv, BSM_WR_CTRL_REG,
                BSM_WR_CTRL_REG_BIT_START);

        /* Wait for load of bootstrap uCode to finish */
        for (i = 0; i < 100; i++) {
                done = iwl3945_read_prph(priv, BSM_WR_CTRL_REG);
                if (!(done & BSM_WR_CTRL_REG_BIT_START))
                        break;
                udelay(10);
        }
        if (i < 100)
                IWL_DEBUG_INFO("BSM write complete, poll %d iterations\n", i);
        else {
                IWL_ERROR("BSM write did not complete!\n");
                return -EIO;
        }

        /* Enable future boot loads whenever power management unit triggers it
         *   (e.g. when powering back up after power-save shutdown) */
        iwl3945_write_prph(priv, BSM_WR_CTRL_REG,
                BSM_WR_CTRL_REG_BIT_START_EN);

        iwl3945_release_nic_access(priv);

        return 0;
}

static void iwl3945_nic_start(struct iwl3945_priv *priv)
{
        /* Remove all resets to allow NIC to operate */
        iwl3945_write32(priv, CSR_RESET, 0);
}

/**
 * iwl3945_read_ucode - Read uCode images from disk file.
 *
 * Copy into buffers for card to fetch via bus-mastering
 */
static int iwl3945_read_ucode(struct iwl3945_priv *priv)
{
        struct iwl3945_ucode *ucode;
        int ret = 0;
        const struct firmware *ucode_raw;
        /* firmware file name contains uCode/driver compatibility version */
        const char *name = priv->cfg->fw_name;
        u8 *src;
        size_t len;
        u32 ver, inst_size, data_size, init_size, init_data_size, boot_size;

        /* Ask kernel firmware_class module to get the boot firmware off disk.
         * request_firmware() is synchronous, file is in memory on return. */
        ret = request_firmware(&ucode_raw, name, &priv->pci_dev->dev);
        if (ret < 0) {
                IWL_ERROR("%s firmware file req failed: Reason %d\n",
                                name, ret);
                goto error;
        }

        IWL_DEBUG_INFO("Got firmware '%s' file (%zd bytes) from disk\n",
                       name, ucode_raw->size);

        /* Make sure that we got at least our header! */
        if (ucode_raw->size < sizeof(*ucode)) {
                IWL_ERROR("File size way too small!\n");
                ret = -EINVAL;
                goto err_release;
        }

        /* Data from ucode file:  header followed by uCode images */
        ucode = (void *)ucode_raw->data;

        ver = le32_to_cpu(ucode->ver);
        inst_size = le32_to_cpu(ucode->inst_size);
        data_size = le32_to_cpu(ucode->data_size);
        init_size = le32_to_cpu(ucode->init_size);
        init_data_size = le32_to_cpu(ucode->init_data_size);
        boot_size = le32_to_cpu(ucode->boot_size);

        IWL_DEBUG_INFO("f/w package hdr ucode version = 0x%x\n", ver);
        IWL_DEBUG_INFO("f/w package hdr runtime inst size = %u\n", inst_size);
        IWL_DEBUG_INFO("f/w package hdr runtime data size = %u\n", data_size);
        IWL_DEBUG_INFO("f/w package hdr init inst size = %u\n", init_size);
        IWL_DEBUG_INFO("f/w package hdr init data size = %u\n", init_data_size);
        IWL_DEBUG_INFO("f/w package hdr boot inst size = %u\n", boot_size);

        /* Verify size of file vs. image size info in file's header */
        if (ucode_raw->size < sizeof(*ucode) +
                inst_size + data_size + init_size +
                init_data_size + boot_size) {

                IWL_DEBUG_INFO("uCode file size %d too small\n",
                               (int)ucode_raw->size);
                ret = -EINVAL;
                goto err_release;
        }

        /* Verify that uCode images will fit in card's SRAM */
        if (inst_size > IWL_MAX_INST_SIZE) {
                IWL_DEBUG_INFO("uCode instr len %d too large to fit in\n",
                               inst_size);
                ret = -EINVAL;
                goto err_release;
        }

        if (data_size > IWL_MAX_DATA_SIZE) {
                IWL_DEBUG_INFO("uCode data len %d too large to fit in\n",
                               data_size);
                ret = -EINVAL;
                goto err_release;
        }
        if (init_size > IWL_MAX_INST_SIZE) {
                IWL_DEBUG_INFO("uCode init instr len %d too large to fit in\n",
                                init_size);
                ret = -EINVAL;
                goto err_release;
        }
        if (init_data_size > IWL_MAX_DATA_SIZE) {
                IWL_DEBUG_INFO("uCode init data len %d too large to fit in\n",
                                init_data_size);
                ret = -EINVAL;
                goto err_release;
        }
        if (boot_size > IWL_MAX_BSM_SIZE) {
                IWL_DEBUG_INFO("uCode boot instr len %d too large to fit in\n",
                                boot_size);
                ret = -EINVAL;
                goto err_release;
        }

        /* Allocate ucode buffers for card's bus-master loading ... */

        /* Runtime instructions and 2 copies of data:
         * 1) unmodified from disk
         * 2) backup cache for save/restore during power-downs */
        priv->ucode_code.len = inst_size;
        iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_code);

        priv->ucode_data.len = data_size;
        iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_data);

        priv->ucode_data_backup.len = data_size;
        iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_data_backup);

        if (!priv->ucode_code.v_addr || !priv->ucode_data.v_addr ||
            !priv->ucode_data_backup.v_addr)
                goto err_pci_alloc;

        /* Initialization instructions and data */
        if (init_size && init_data_size) {
                priv->ucode_init.len = init_size;
                iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_init);

                priv->ucode_init_data.len = init_data_size;
                iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_init_data);

                if (!priv->ucode_init.v_addr || !priv->ucode_init_data.v_addr)
                        goto err_pci_alloc;
        }

        /* Bootstrap (instructions only, no data) */
        if (boot_size) {
                priv->ucode_boot.len = boot_size;
                iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_boot);

                if (!priv->ucode_boot.v_addr)
                        goto err_pci_alloc;
        }

        /* Copy images into buffers for card's bus-master reads ... */

        /* Runtime instructions (first block of data in file) */
        src = &ucode->data[0];
        len = priv->ucode_code.len;
        IWL_DEBUG_INFO("Copying (but not loading) uCode instr len %Zd\n", len);
        memcpy(priv->ucode_code.v_addr, src, len);
        IWL_DEBUG_INFO("uCode instr buf vaddr = 0x%p, paddr = 0x%08x\n",
                priv->ucode_code.v_addr, (u32)priv->ucode_code.p_addr);

        /* Runtime data (2nd block)
         * NOTE:  Copy into backup buffer will be done in iwl3945_up()  */
        src = &ucode->data[inst_size];
        len = priv->ucode_data.len;
        IWL_DEBUG_INFO("Copying (but not loading) uCode data len %Zd\n", len);
        memcpy(priv->ucode_data.v_addr, src, len);
        memcpy(priv->ucode_data_backup.v_addr, src, len);

        /* Initialization instructions (3rd block) */
        if (init_size) {
                src = &ucode->data[inst_size + data_size];
                len = priv->ucode_init.len;
                IWL_DEBUG_INFO("Copying (but not loading) init instr len %Zd\n",
                               len);
                memcpy(priv->ucode_init.v_addr, src, len);
        }

        /* Initialization data (4th block) */
        if (init_data_size) {
                src = &ucode->data[inst_size + data_size + init_size];
                len = priv->ucode_init_data.len;
                IWL_DEBUG_INFO("Copying (but not loading) init data len %d\n",
                               (int)len);
                memcpy(priv->ucode_init_data.v_addr, src, len);
        }

        /* Bootstrap instructions (5th block) */
        src = &ucode->data[inst_size + data_size + init_size + init_data_size];
        len = priv->ucode_boot.len;
        IWL_DEBUG_INFO("Copying (but not loading) boot instr len %d\n",
                       (int)len);
        memcpy(priv->ucode_boot.v_addr, src, len);

        /* We have our copies now, allow OS release its copies */
        release_firmware(ucode_raw);
        return 0;

 err_pci_alloc:
        IWL_ERROR("failed to allocate pci memory\n");
        ret = -ENOMEM;
        iwl3945_dealloc_ucode_pci(priv);

 err_release:
        release_firmware(ucode_raw);

 error:
        return ret;
}


/**
 * iwl3945_set_ucode_ptrs - Set uCode address location
 *
 * Tell initialization uCode where to find runtime uCode.
 *
 * BSM registers initially contain pointers to initialization uCode.
 * We need to replace them to load runtime uCode inst and data,
 * and to save runtime data when powering down.
 */
static int iwl3945_set_ucode_ptrs(struct iwl3945_priv *priv)
{
        dma_addr_t pinst;
        dma_addr_t pdata;
        int rc = 0;
        unsigned long flags;

        /* bits 31:0 for 3945 */
        pinst = priv->ucode_code.p_addr;
        pdata = priv->ucode_data_backup.p_addr;

        spin_lock_irqsave(&priv->lock, flags);
        rc = iwl3945_grab_nic_access(priv);
        if (rc) {
                spin_unlock_irqrestore(&priv->lock, flags);
                return rc;
        }

        /* Tell bootstrap uCode where to find image to load */
        iwl3945_write_prph(priv, BSM_DRAM_INST_PTR_REG, pinst);
        iwl3945_write_prph(priv, BSM_DRAM_DATA_PTR_REG, pdata);
        iwl3945_write_prph(priv, BSM_DRAM_DATA_BYTECOUNT_REG,
                                 priv->ucode_data.len);

        /* Inst byte count must be last to set up, bit 31 signals uCode
         *   that all new ptr/size info is in place */
        iwl3945_write_prph(priv, BSM_DRAM_INST_BYTECOUNT_REG,
                                 priv->ucode_code.len | BSM_DRAM_INST_LOAD);

        iwl3945_release_nic_access(priv);

        spin_unlock_irqrestore(&priv->lock, flags);

        IWL_DEBUG_INFO("Runtime uCode pointers are set.\n");

        return rc;
}

/**
 * iwl3945_init_alive_start - Called after REPLY_ALIVE notification received
 *
 * Called after REPLY_ALIVE notification received from "initialize" uCode.
 *
 * Tell "initialize" uCode to go ahead and load the runtime uCode.
 */
static void iwl3945_init_alive_start(struct iwl3945_priv *priv)
{
        /* Check alive response for "valid" sign from uCode */
        if (priv->card_alive_init.is_valid != UCODE_VALID_OK) {
                /* We had an error bringing up the hardware, so take it
                 * all the way back down so we can try again */
                IWL_DEBUG_INFO("Initialize Alive failed.\n");
                goto restart;
        }

        /* Bootstrap uCode has loaded initialize uCode ... verify inst image.
         * This is a paranoid check, because we would not have gotten the
         * "initialize" alive if code weren't properly loaded.  */
        if (iwl3945_verify_ucode(priv)) {
                /* Runtime instruction load was bad;
                 * take it all the way back down so we can try again */
                IWL_DEBUG_INFO("Bad \"initialize\" uCode load.\n");
                goto restart;
        }

        /* Send pointers to protocol/runtime uCode image ... init code will
         * load and launch runtime uCode, which will send us another "Alive"
         * notification. */
        IWL_DEBUG_INFO("Initialization Alive received.\n");
        if (iwl3945_set_ucode_ptrs(priv)) {
                /* Runtime instruction load won't happen;
                 * take it all the way back down so we can try again */
                IWL_DEBUG_INFO("Couldn't set up uCode pointers.\n");
                goto restart;
        }
        return;

 restart:
        queue_work(priv->workqueue, &priv->restart);
}


/* temporary */
static int iwl3945_mac_beacon_update(struct ieee80211_hw *hw,
                                     struct sk_buff *skb);

/**
 * iwl3945_alive_start - called after REPLY_ALIVE notification received
 *                   from protocol/runtime uCode (initialization uCode's
 *                   Alive gets handled by iwl3945_init_alive_start()).
 */
static void iwl3945_alive_start(struct iwl3945_priv *priv)
{
        int rc = 0;
        int thermal_spin = 0;
        u32 rfkill;

        IWL_DEBUG_INFO("Runtime Alive received.\n");

        if (priv->card_alive.is_valid != UCODE_VALID_OK) {
                /* We had an error bringing up the hardware, so take it
                 * all the way back down so we can try again */
                IWL_DEBUG_INFO("Alive failed.\n");
                goto restart;
        }

        /* Initialize uCode has loaded Runtime uCode ... verify inst image.
         * This is a paranoid check, because we would not have gotten the
         * "runtime" alive if code weren't properly loaded.  */
        if (iwl3945_verify_ucode(priv)) {
                /* Runtime instruction load was bad;
                 * take it all the way back down so we can try again */
                IWL_DEBUG_INFO("Bad runtime uCode load.\n");
                goto restart;
        }

        iwl3945_clear_stations_table(priv);

        rc = iwl3945_grab_nic_access(priv);
        if (rc) {
                IWL_WARNING("Can not read RFKILL status from adapter\n");
                return;
        }

        rfkill = iwl3945_read_prph(priv, APMG_RFKILL_REG);
        IWL_DEBUG_INFO("RFKILL status: 0x%x\n", rfkill);
        iwl3945_release_nic_access(priv);

        if (rfkill & 0x1) {
                clear_bit(STATUS_RF_KILL_HW, &priv->status);
                /* if RFKILL is not on, then wait for thermal
                 * sensor in adapter to kick in */
                while (iwl3945_hw_get_temperature(priv) == 0) {
                        thermal_spin++;
                        udelay(10);
                }

                if (thermal_spin)
                        IWL_DEBUG_INFO("Thermal calibration took %dus\n",
                                       thermal_spin * 10);
        } else
                set_bit(STATUS_RF_KILL_HW, &priv->status);

        /* After the ALIVE response, we can send commands to 3945 uCode */
        set_bit(STATUS_ALIVE, &priv->status);

        /* Clear out the uCode error bit if it is set */
        clear_bit(STATUS_FW_ERROR, &priv->status);

        if (iwl3945_is_rfkill(priv))
                return;

        ieee80211_wake_queues(priv->hw);

        priv->active_rate = priv->rates_mask;
        priv->active_rate_basic = priv->rates_mask & IWL_BASIC_RATES_MASK;

        iwl3945_send_power_mode(priv, IWL_POWER_LEVEL(priv->power_mode));

        if (iwl3945_is_associated(priv)) {
                struct iwl3945_rxon_cmd *active_rxon =
                                (struct iwl3945_rxon_cmd *)(&priv->active_rxon);

                memcpy(&priv->staging_rxon, &priv->active_rxon,
                       sizeof(priv->staging_rxon));
                active_rxon->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
        } else {
                /* Initialize our rx_config data */
                iwl3945_connection_init_rx_config(priv, priv->iw_mode);
                memcpy(priv->staging_rxon.node_addr, priv->mac_addr, ETH_ALEN);
        }

        /* Configure Bluetooth device coexistence support */
        iwl3945_send_bt_config(priv);

        /* Configure the adapter for unassociated operation */
        iwl3945_commit_rxon(priv);

        iwl3945_reg_txpower_periodic(priv);

        iwl3945_led_register(priv);

        IWL_DEBUG_INFO("ALIVE processing complete.\n");
        set_bit(STATUS_READY, &priv->status);
        wake_up_interruptible(&priv->wait_command_queue);

        if (priv->error_recovering)
                iwl3945_error_recovery(priv);

        /* reassociate for ADHOC mode */
        if (priv->vif && (priv->iw_mode == NL80211_IFTYPE_ADHOC)) {
                struct sk_buff *beacon = ieee80211_beacon_get(priv->hw,
                                                                priv->vif);
                if (beacon)
                        iwl3945_mac_beacon_update(priv->hw, beacon);
        }

        return;

 restart:
        queue_work(priv->workqueue, &priv->restart);
}

static void iwl3945_cancel_deferred_work(struct iwl3945_priv *priv);

static void __iwl3945_down(struct iwl3945_priv *priv)
{
        unsigned long flags;
        int exit_pending = test_bit(STATUS_EXIT_PENDING, &priv->status);
        struct ieee80211_conf *conf = NULL;

        IWL_DEBUG_INFO(DRV_NAME " is going down\n");

        conf = ieee80211_get_hw_conf(priv->hw);

        if (!exit_pending)
                set_bit(STATUS_EXIT_PENDING, &priv->status);

        iwl3945_led_unregister(priv);
        iwl3945_clear_stations_table(priv);

        /* Unblock any waiting calls */
        wake_up_interruptible_all(&priv->wait_command_queue);

        /* Wipe out the EXIT_PENDING status bit if we are not actually
         * exiting the module */
        if (!exit_pending)
                clear_bit(STATUS_EXIT_PENDING, &priv->status);

        /* stop and reset the on-board processor */
        iwl3945_write32(priv, CSR_RESET, CSR_RESET_REG_FLAG_NEVO_RESET);

        /* tell the device to stop sending interrupts */
        spin_lock_irqsave(&priv->lock, flags);
        iwl3945_disable_interrupts(priv);
        spin_unlock_irqrestore(&priv->lock, flags);
        iwl_synchronize_irq(priv);

        if (priv->mac80211_registered)
                ieee80211_stop_queues(priv->hw);

        /* If we have not previously called iwl3945_init() then
         * clear all bits but the RF Kill and SUSPEND bits and return */
        if (!iwl3945_is_init(priv)) {
                priv->status = test_bit(STATUS_RF_KILL_HW, &priv->status) <<
                                        STATUS_RF_KILL_HW |
                               test_bit(STATUS_RF_KILL_SW, &priv->status) <<
                                        STATUS_RF_KILL_SW |
                               test_bit(STATUS_GEO_CONFIGURED, &priv->status) <<
                                        STATUS_GEO_CONFIGURED |
                               test_bit(STATUS_IN_SUSPEND, &priv->status) <<
                                        STATUS_IN_SUSPEND |
                                test_bit(STATUS_EXIT_PENDING, &priv->status) <<
                                        STATUS_EXIT_PENDING;
                goto exit;
        }

        /* ...otherwise clear out all the status bits but the RF Kill and
         * SUSPEND bits and continue taking the NIC down. */
        priv->status &= test_bit(STATUS_RF_KILL_HW, &priv->status) <<
                                STATUS_RF_KILL_HW |
                        test_bit(STATUS_RF_KILL_SW, &priv->status) <<
                                STATUS_RF_KILL_SW |
                        test_bit(STATUS_GEO_CONFIGURED, &priv->status) <<
                                STATUS_GEO_CONFIGURED |
                        test_bit(STATUS_IN_SUSPEND, &priv->status) <<
                                STATUS_IN_SUSPEND |
                        test_bit(STATUS_FW_ERROR, &priv->status) <<
                                STATUS_FW_ERROR |
                        test_bit(STATUS_EXIT_PENDING, &priv->status) <<
                                STATUS_EXIT_PENDING;

        spin_lock_irqsave(&priv->lock, flags);
        iwl3945_clear_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
        spin_unlock_irqrestore(&priv->lock, flags);

        iwl3945_hw_txq_ctx_stop(priv);
        iwl3945_hw_rxq_stop(priv);

        spin_lock_irqsave(&priv->lock, flags);
        if (!iwl3945_grab_nic_access(priv)) {
                iwl3945_write_prph(priv, APMG_CLK_DIS_REG,
                                         APMG_CLK_VAL_DMA_CLK_RQT);
                iwl3945_release_nic_access(priv);
        }
        spin_unlock_irqrestore(&priv->lock, flags);

        udelay(5);

        iwl3945_hw_nic_stop_master(priv);
        iwl3945_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
        iwl3945_hw_nic_reset(priv);

 exit:
        memset(&priv->card_alive, 0, sizeof(struct iwl3945_alive_resp));

        if (priv->ibss_beacon)
                dev_kfree_skb(priv->ibss_beacon);
        priv->ibss_beacon = NULL;

        /* clear out any free frames */
        iwl3945_clear_free_frames(priv);
}

static void iwl3945_down(struct iwl3945_priv *priv)
{
        mutex_lock(&priv->mutex);
        __iwl3945_down(priv);
        mutex_unlock(&priv->mutex);

        iwl3945_cancel_deferred_work(priv);
}

#define MAX_HW_RESTARTS 5

static int __iwl3945_up(struct iwl3945_priv *priv)
{
        int rc, i;

        if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
                IWL_WARNING("Exit pending; will not bring the NIC up\n");
                return -EIO;
        }

        if (test_bit(STATUS_RF_KILL_SW, &priv->status)) {
                IWL_WARNING("Radio disabled by SW RF kill (module "
                            "parameter)\n");
                return -ENODEV;
        }

        if (!priv->ucode_data_backup.v_addr || !priv->ucode_data.v_addr) {
                IWL_ERROR("ucode not available for device bring up\n");
                return -EIO;
        }

        /* If platform's RF_KILL switch is NOT set to KILL */
        if (iwl3945_read32(priv, CSR_GP_CNTRL) &
                                CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW)
                clear_bit(STATUS_RF_KILL_HW, &priv->status);
        else {
                set_bit(STATUS_RF_KILL_HW, &priv->status);
                if (!test_bit(STATUS_IN_SUSPEND, &priv->status)) {
                        IWL_WARNING("Radio disabled by HW RF Kill switch\n");
                        return -ENODEV;
                }
        }

        iwl3945_write32(priv, CSR_INT, 0xFFFFFFFF);

        rc = iwl3945_hw_nic_init(priv);
        if (rc) {
                IWL_ERROR("Unable to int nic\n");
                return rc;
        }

        /* make sure rfkill handshake bits are cleared */
        iwl3945_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
        iwl3945_write32(priv, CSR_UCODE_DRV_GP1_CLR,
                    CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);

        /* clear (again), then enable host interrupts */
        iwl3945_write32(priv, CSR_INT, 0xFFFFFFFF);
        iwl3945_enable_interrupts(priv);

        /* really make sure rfkill handshake bits are cleared */
        iwl3945_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
        iwl3945_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);

        /* Copy original ucode data image from disk into backup cache.
         * This will be used to initialize the on-board processor's
         * data SRAM for a clean start when the runtime program first loads. */
        memcpy(priv->ucode_data_backup.v_addr, priv->ucode_data.v_addr,
               priv->ucode_data.len);

        /* We return success when we resume from suspend and rf_kill is on. */
        if (test_bit(STATUS_RF_KILL_HW, &priv->status))
                return 0;

        for (i = 0; i < MAX_HW_RESTARTS; i++) {

                iwl3945_clear_stations_table(priv);

                /* load bootstrap state machine,
                 * load bootstrap program into processor's memory,
                 * prepare to load the "initialize" uCode */
                rc = iwl3945_load_bsm(priv);

                if (rc) {
                        IWL_ERROR("Unable to set up bootstrap uCode: %d\n", rc);
                        continue;
                }

                /* start card; "initialize" will load runtime ucode */
                iwl3945_nic_start(priv);

                IWL_DEBUG_INFO(DRV_NAME " is coming up\n");

                return 0;
        }

        set_bit(STATUS_EXIT_PENDING, &priv->status);
        __iwl3945_down(priv);
        clear_bit(STATUS_EXIT_PENDING, &priv->status);

        /* tried to restart and config the device for as long as our
         * patience could withstand */
        IWL_ERROR("Unable to initialize device after %d attempts.\n", i);
        return -EIO;
}


/*****************************************************************************
 *
 * Workqueue callbacks
 *
 *****************************************************************************/

static void iwl3945_bg_init_alive_start(struct work_struct *data)
{
        struct iwl3945_priv *priv =
            container_of(data, struct iwl3945_priv, init_alive_start.work);

        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                return;

        mutex_lock(&priv->mutex);
        iwl3945_init_alive_start(priv);
        mutex_unlock(&priv->mutex);
}

static void iwl3945_bg_alive_start(struct work_struct *data)
{
        struct iwl3945_priv *priv =
            container_of(data, struct iwl3945_priv, alive_start.work);

        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                return;

        mutex_lock(&priv->mutex);
        iwl3945_alive_start(priv);
        mutex_unlock(&priv->mutex);
}

static void iwl3945_bg_rf_kill(struct work_struct *work)
{
        struct iwl3945_priv *priv = container_of(work, struct iwl3945_priv, rf_kill);

        wake_up_interruptible(&priv->wait_command_queue);

        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                return;

        mutex_lock(&priv->mutex);

        if (!iwl3945_is_rfkill(priv)) {
                IWL_DEBUG(IWL_DL_INFO | IWL_DL_RF_KILL,
                          "HW and/or SW RF Kill no longer active, restarting "
                          "device\n");
                if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
                        queue_work(priv->workqueue, &priv->restart);
        } else {

                if (!test_bit(STATUS_RF_KILL_HW, &priv->status))
                        IWL_DEBUG_RF_KILL("Can not turn radio back on - "
                                          "disabled by SW switch\n");
                else
                        IWL_WARNING("Radio Frequency Kill Switch is On:\n"
                                    "Kill switch must be turned off for "
                                    "wireless networking to work.\n");
        }

        mutex_unlock(&priv->mutex);
        iwl3945_rfkill_set_hw_state(priv);
}

#define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)

static void iwl3945_bg_scan_check(struct work_struct *data)
{
        struct iwl3945_priv *priv =
            container_of(data, struct iwl3945_priv, scan_check.work);

        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                return;

        mutex_lock(&priv->mutex);
        if (test_bit(STATUS_SCANNING, &priv->status) ||
            test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
                IWL_DEBUG(IWL_DL_INFO | IWL_DL_SCAN,
                          "Scan completion watchdog resetting adapter (%dms)\n",
                          jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));

                if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
                        iwl3945_send_scan_abort(priv);
        }
        mutex_unlock(&priv->mutex);
}

static void iwl3945_bg_request_scan(struct work_struct *data)
{
        struct iwl3945_priv *priv =
            container_of(data, struct iwl3945_priv, request_scan);
        struct iwl3945_host_cmd cmd = {
                .id = REPLY_SCAN_CMD,
                .len = sizeof(struct iwl3945_scan_cmd),
                .meta.flags = CMD_SIZE_HUGE,
        };
        int rc = 0;
        struct iwl3945_scan_cmd *scan;
        struct ieee80211_conf *conf = NULL;
        u8 n_probes = 2;
        enum ieee80211_band band;
        DECLARE_SSID_BUF(ssid);

        conf = ieee80211_get_hw_conf(priv->hw);

        mutex_lock(&priv->mutex);

        if (!iwl3945_is_ready(priv)) {
                IWL_WARNING("request scan called when driver not ready.\n");
                goto done;
        }

        /* Make sure the scan wasn't canceled before this queued work
         * was given the chance to run... */
        if (!test_bit(STATUS_SCANNING, &priv->status))
                goto done;

        /* This should never be called or scheduled if there is currently
         * a scan active in the hardware. */
        if (test_bit(STATUS_SCAN_HW, &priv->status)) {
                IWL_DEBUG_INFO("Multiple concurrent scan requests in parallel. "
                               "Ignoring second request.\n");
                rc = -EIO;
                goto done;
        }

        if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
                IWL_DEBUG_SCAN("Aborting scan due to device shutdown\n");
                goto done;
        }

        if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
                IWL_DEBUG_HC("Scan request while abort pending.  Queuing.\n");
                goto done;
        }

        if (iwl3945_is_rfkill(priv)) {
                IWL_DEBUG_HC("Aborting scan due to RF Kill activation\n");
                goto done;
        }

        if (!test_bit(STATUS_READY, &priv->status)) {
                IWL_DEBUG_HC("Scan request while uninitialized.  Queuing.\n");
                goto done;
        }

        if (!priv->scan_bands) {
                IWL_DEBUG_HC("Aborting scan due to no requested bands\n");
                goto done;
        }

        if (!priv->scan) {
                priv->scan = kmalloc(sizeof(struct iwl3945_scan_cmd) +
                                     IWL_MAX_SCAN_SIZE, GFP_KERNEL);
                if (!priv->scan) {
                        rc = -ENOMEM;
                        goto done;
                }
        }
        scan = priv->scan;
        memset(scan, 0, sizeof(struct iwl3945_scan_cmd) + IWL_MAX_SCAN_SIZE);

        scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
        scan->quiet_time = IWL_ACTIVE_QUIET_TIME;

        if (iwl3945_is_associated(priv)) {
                u16 interval = 0;
                u32 extra;
                u32 suspend_time = 100;
                u32 scan_suspend_time = 100;
                unsigned long flags;

                IWL_DEBUG_INFO("Scanning while associated...\n");

                spin_lock_irqsave(&priv->lock, flags);
                interval = priv->beacon_int;
                spin_unlock_irqrestore(&priv->lock, flags);

                scan->suspend_time = 0;
                scan->max_out_time = cpu_to_le32(200 * 1024);
                if (!interval)
                        interval = suspend_time;
                /*
                 * suspend time format:
                 *  0-19: beacon interval in usec (time before exec.)
                 * 20-23: 0
                 * 24-31: number of beacons (suspend between channels)
                 */

                extra = (suspend_time / interval) << 24;
                scan_suspend_time = 0xFF0FFFFF &
                    (extra | ((suspend_time % interval) * 1024));

                scan->suspend_time = cpu_to_le32(scan_suspend_time);
                IWL_DEBUG_SCAN("suspend_time 0x%X beacon interval %d\n",
                               scan_suspend_time, interval);
        }

        /* We should add the ability for user to lock to PASSIVE ONLY */
        if (priv->one_direct_scan) {
                IWL_DEBUG_SCAN
                    ("Kicking off one direct scan for '%s'\n",
                     print_ssid(ssid, priv->direct_ssid,
                                priv->direct_ssid_len));
                scan->direct_scan[0].id = WLAN_EID_SSID;
                scan->direct_scan[0].len = priv->direct_ssid_len;
                memcpy(scan->direct_scan[0].ssid,
                       priv->direct_ssid, priv->direct_ssid_len);
                n_probes++;
        } else
                IWL_DEBUG_SCAN("Kicking off one indirect scan.\n");

        /* We don't build a direct scan probe request; the uCode will do
         * that based on the direct_mask added to each channel entry */
        scan->tx_cmd.len = cpu_to_le16(
                iwl3945_fill_probe_req(priv, (struct ieee80211_mgmt *)scan->data,
                        IWL_MAX_SCAN_SIZE - sizeof(*scan)));
        scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
        scan->tx_cmd.sta_id = priv->hw_setting.bcast_sta_id;
        scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;

        /* flags + rate selection */

        if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) {
                scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
                scan->tx_cmd.rate = IWL_RATE_1M_PLCP;
                scan->good_CRC_th = 0;
                band = IEEE80211_BAND_2GHZ;
        } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) {
                scan->tx_cmd.rate = IWL_RATE_6M_PLCP;
                scan->good_CRC_th = IWL_GOOD_CRC_TH;
                band = IEEE80211_BAND_5GHZ;
        } else {
                IWL_WARNING("Invalid scan band count\n");
                goto done;
        }

        /* select Rx antennas */
        scan->flags |= iwl3945_get_antenna_flags(priv);

        if (priv->iw_mode == NL80211_IFTYPE_MONITOR)
                scan->filter_flags = RXON_FILTER_PROMISC_MSK;

        scan->channel_count =
                iwl3945_get_channels_for_scan(priv, band, 1, /* active */
                                              n_probes,
                        (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);

        if (scan->channel_count == 0) {
                IWL_DEBUG_SCAN("channel count %d\n", scan->channel_count);
                goto done;
        }

        cmd.len += le16_to_cpu(scan->tx_cmd.len) +
            scan->channel_count * sizeof(struct iwl3945_scan_channel);
        cmd.data = scan;
        scan->len = cpu_to_le16(cmd.len);

        set_bit(STATUS_SCAN_HW, &priv->status);
        rc = iwl3945_send_cmd_sync(priv, &cmd);
        if (rc)
                goto done;

        queue_delayed_work(priv->workqueue, &priv->scan_check,
                           IWL_SCAN_CHECK_WATCHDOG);

        mutex_unlock(&priv->mutex);
        return;

 done:
        /* can not perform scan make sure we clear scanning
         * bits from status so next scan request can be performed.
         * if we dont clear scanning status bit here all next scan
         * will fail
        */
        clear_bit(STATUS_SCAN_HW, &priv->status);
        clear_bit(STATUS_SCANNING, &priv->status);

        /* inform mac80211 scan aborted */
        queue_work(priv->workqueue, &priv->scan_completed);
        mutex_unlock(&priv->mutex);
}

static void iwl3945_bg_up(struct work_struct *data)
{
        struct iwl3945_priv *priv = container_of(data, struct iwl3945_priv, up);

        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                return;

        mutex_lock(&priv->mutex);
        __iwl3945_up(priv);
        mutex_unlock(&priv->mutex);
        iwl3945_rfkill_set_hw_state(priv);
}

static void iwl3945_bg_restart(struct work_struct *data)
{
        struct iwl3945_priv *priv = container_of(data, struct iwl3945_priv, restart);

        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                return;

        iwl3945_down(priv);
        queue_work(priv->workqueue, &priv->up);
}

static void iwl3945_bg_rx_replenish(struct work_struct *data)
{
        struct iwl3945_priv *priv =
            container_of(data, struct iwl3945_priv, rx_replenish);

        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                return;

        mutex_lock(&priv->mutex);
        iwl3945_rx_replenish(priv);
        mutex_unlock(&priv->mutex);
}

#define IWL_DELAY_NEXT_SCAN (HZ*2)

static void iwl3945_post_associate(struct iwl3945_priv *priv)
{
        int rc = 0;
        struct ieee80211_conf *conf = NULL;

        if (priv->iw_mode == NL80211_IFTYPE_AP) {
                IWL_ERROR("%s Should not be called in AP mode\n", __func__);
                return;
        }


        IWL_DEBUG_ASSOC("Associated as %d to: %pM\n",
                        priv->assoc_id, priv->active_rxon.bssid_addr);

        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                return;

        if (!priv->vif || !priv->is_open)
                return;

        iwl3945_scan_cancel_timeout(priv, 200);

        conf = ieee80211_get_hw_conf(priv->hw);

        priv->staging_rxon.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
        iwl3945_commit_rxon(priv);

        memset(&priv->rxon_timing, 0, sizeof(struct iwl3945_rxon_time_cmd));
        iwl3945_setup_rxon_timing(priv);
        rc = iwl3945_send_cmd_pdu(priv, REPLY_RXON_TIMING,
                              sizeof(priv->rxon_timing), &priv->rxon_timing);
        if (rc)
                IWL_WARNING("REPLY_RXON_TIMING failed - "
                            "Attempting to continue.\n");

        priv->staging_rxon.filter_flags |= RXON_FILTER_ASSOC_MSK;

        priv->staging_rxon.assoc_id = cpu_to_le16(priv->assoc_id);

        IWL_DEBUG_ASSOC("assoc id %d beacon interval %d\n",
                        priv->assoc_id, priv->beacon_int);

        if (priv->assoc_capability & WLAN_CAPABILITY_SHORT_PREAMBLE)
                priv->staging_rxon.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
        else
                priv->staging_rxon.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;

        if (priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK) {
                if (priv->assoc_capability & WLAN_CAPABILITY_SHORT_SLOT_TIME)
                        priv->staging_rxon.flags |= RXON_FLG_SHORT_SLOT_MSK;
                else
                        priv->staging_rxon.flags &= ~RXON_FLG_SHORT_SLOT_MSK;

                if (priv->iw_mode == NL80211_IFTYPE_ADHOC)
                        priv->staging_rxon.flags &= ~RXON_FLG_SHORT_SLOT_MSK;

        }

        iwl3945_commit_rxon(priv);

        switch (priv->iw_mode) {
        case NL80211_IFTYPE_STATION:
                iwl3945_rate_scale_init(priv->hw, IWL_AP_ID);
                break;

        case NL80211_IFTYPE_ADHOC:

                priv->assoc_id = 1;
                iwl3945_add_station(priv, priv->bssid, 0, 0);
                iwl3945_sync_sta(priv, IWL_STA_ID,
                                 (priv->band == IEEE80211_BAND_5GHZ) ?
                                 IWL_RATE_6M_PLCP : IWL_RATE_1M_PLCP,
                                 CMD_ASYNC);
                iwl3945_rate_scale_init(priv->hw, IWL_STA_ID);
                iwl3945_send_beacon_cmd(priv);

                break;

        default:
                 IWL_ERROR("%s Should not be called in %d mode\n",
                           __func__, priv->iw_mode);
                break;
        }

        iwl3945_activate_qos(priv, 0);

        /* we have just associated, don't start scan too early */
        priv->next_scan_jiffies = jiffies + IWL_DELAY_NEXT_SCAN;
}

static void iwl3945_bg_abort_scan(struct work_struct *work)
{
        struct iwl3945_priv *priv = container_of(work, struct iwl3945_priv, abort_scan);

        if (!iwl3945_is_ready(priv))
                return;

        mutex_lock(&priv->mutex);

        set_bit(STATUS_SCAN_ABORTING, &priv->status);
        iwl3945_send_scan_abort(priv);

        mutex_unlock(&priv->mutex);
}

static int iwl3945_mac_config(struct ieee80211_hw *hw, u32 changed);

static void iwl3945_bg_scan_completed(struct work_struct *work)
{
        struct iwl3945_priv *priv =
            container_of(work, struct iwl3945_priv, scan_completed);

        IWL_DEBUG(IWL_DL_INFO | IWL_DL_SCAN, "SCAN complete scan\n");

        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                return;

        if (test_bit(STATUS_CONF_PENDING, &priv->status))
                iwl3945_mac_config(priv->hw, 0);

        ieee80211_scan_completed(priv->hw);

        /* Since setting the TXPOWER may have been deferred while
         * performing the scan, fire one off */
        mutex_lock(&priv->mutex);
        iwl3945_hw_reg_send_txpower(priv);
        mutex_unlock(&priv->mutex);
}

/*****************************************************************************
 *
 * mac80211 entry point functions
 *
 *****************************************************************************/

#define UCODE_READY_TIMEOUT     (2 * HZ)

static int iwl3945_mac_start(struct ieee80211_hw *hw)
{
        struct iwl3945_priv *priv = hw->priv;
        int ret;

        IWL_DEBUG_MAC80211("enter\n");

        if (pci_enable_device(priv->pci_dev)) {
                IWL_ERROR("Fail to pci_enable_device\n");
                return -ENODEV;
        }
        pci_restore_state(priv->pci_dev);
        pci_enable_msi(priv->pci_dev);

        ret = request_irq(priv->pci_dev->irq, iwl3945_isr, IRQF_SHARED,
                          DRV_NAME, priv);
        if (ret) {
                IWL_ERROR("Error allocating IRQ %d\n", priv->pci_dev->irq);
                goto out_disable_msi;
        }

        /* we should be verifying the device is ready to be opened */
        mutex_lock(&priv->mutex);

        memset(&priv->staging_rxon, 0, sizeof(struct iwl3945_rxon_cmd));
        /* fetch ucode file from disk, alloc and copy to bus-master buffers ...
         * ucode filename and max sizes are card-specific. */

        if (!priv->ucode_code.len) {
                ret = iwl3945_read_ucode(priv);
                if (ret) {
                        IWL_ERROR("Could not read microcode: %d\n", ret);
                        mutex_unlock(&priv->mutex);
                        goto out_release_irq;
                }
        }

        ret = __iwl3945_up(priv);

        mutex_unlock(&priv->mutex);

        iwl3945_rfkill_set_hw_state(priv);

        if (ret)
                goto out_release_irq;

        IWL_DEBUG_INFO("Start UP work.\n");

        if (test_bit(STATUS_IN_SUSPEND, &priv->status))
                return 0;

        /* Wait for START_ALIVE from ucode. Otherwise callbacks from
         * mac80211 will not be run successfully. */
        ret = wait_event_interruptible_timeout(priv->wait_command_queue,
                        test_bit(STATUS_READY, &priv->status),
                        UCODE_READY_TIMEOUT);
        if (!ret) {
                if (!test_bit(STATUS_READY, &priv->status)) {
                        IWL_ERROR("Wait for START_ALIVE timeout after %dms.\n",
                                  jiffies_to_msecs(UCODE_READY_TIMEOUT));
                        ret = -ETIMEDOUT;
                        goto out_release_irq;
                }
        }

        priv->is_open = 1;
        IWL_DEBUG_MAC80211("leave\n");
        return 0;

out_release_irq:
        free_irq(priv->pci_dev->irq, priv);
out_disable_msi:
        pci_disable_msi(priv->pci_dev);
        pci_disable_device(priv->pci_dev);
        priv->is_open = 0;
        IWL_DEBUG_MAC80211("leave - failed\n");
        return ret;
}

static void iwl3945_mac_stop(struct ieee80211_hw *hw)
{
        struct iwl3945_priv *priv = hw->priv;

        IWL_DEBUG_MAC80211("enter\n");

        if (!priv->is_open) {
                IWL_DEBUG_MAC80211("leave - skip\n");
                return;
        }

        priv->is_open = 0;

        if (iwl3945_is_ready_rf(priv)) {
                /* stop mac, cancel any scan request and clear
                 * RXON_FILTER_ASSOC_MSK BIT
                 */
                mutex_lock(&priv->mutex);
                iwl3945_scan_cancel_timeout(priv, 100);
                mutex_unlock(&priv->mutex);
        }

        iwl3945_down(priv);

        flush_workqueue(priv->workqueue);
        free_irq(priv->pci_dev->irq, priv);
        pci_disable_msi(priv->pci_dev);
        pci_save_state(priv->pci_dev);
        pci_disable_device(priv->pci_dev);

        IWL_DEBUG_MAC80211("leave\n");
}

static int iwl3945_mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
{
        struct iwl3945_priv *priv = hw->priv;

        IWL_DEBUG_MAC80211("enter\n");

        IWL_DEBUG_TX("dev->xmit(%d bytes) at rate 0x%02x\n", skb->len,
                     ieee80211_get_tx_rate(hw, IEEE80211_SKB_CB(skb))->bitrate);

        if (iwl3945_tx_skb(priv, skb))
                dev_kfree_skb_any(skb);

        IWL_DEBUG_MAC80211("leave\n");
        return 0;
}

static int iwl3945_mac_add_interface(struct ieee80211_hw *hw,
                                 struct ieee80211_if_init_conf *conf)
{
        struct iwl3945_priv *priv = hw->priv;
        unsigned long flags;

        IWL_DEBUG_MAC80211("enter: type %d\n", conf->type);

        if (priv->vif) {
                IWL_DEBUG_MAC80211("leave - vif != NULL\n");
                return -EOPNOTSUPP;
        }

        spin_lock_irqsave(&priv->lock, flags);
        priv->vif = conf->vif;
        priv->iw_mode = conf->type;

        spin_unlock_irqrestore(&priv->lock, flags);

        mutex_lock(&priv->mutex);

        if (conf->mac_addr) {
                IWL_DEBUG_MAC80211("Set: %pM\n", conf->mac_addr);
                memcpy(priv->mac_addr, conf->mac_addr, ETH_ALEN);
        }

        if (iwl3945_is_ready(priv))
                iwl3945_set_mode(priv, conf->type);

        mutex_unlock(&priv->mutex);

        IWL_DEBUG_MAC80211("leave\n");
        return 0;
}

/**
 * iwl3945_mac_config - mac80211 config callback
 *
 * We ignore conf->flags & IEEE80211_CONF_SHORT_SLOT_TIME since it seems to
 * be set inappropriately and the driver currently sets the hardware up to
 * use it whenever needed.
 */
static int iwl3945_mac_config(struct ieee80211_hw *hw, u32 changed)
{
        struct iwl3945_priv *priv = hw->priv;
        const struct iwl3945_channel_info *ch_info;
        struct ieee80211_conf *conf = &hw->conf;
        unsigned long flags;
        int ret = 0;

        mutex_lock(&priv->mutex);
        IWL_DEBUG_MAC80211("enter to channel %d\n", conf->channel->hw_value);

        if (!iwl3945_is_ready(priv)) {
                IWL_DEBUG_MAC80211("leave - not ready\n");
                ret = -EIO;
                goto out;
        }

        if (unlikely(!iwl3945_param_disable_hw_scan &&
                     test_bit(STATUS_SCANNING, &priv->status))) {
                IWL_DEBUG_MAC80211("leave - scanning\n");
                set_bit(STATUS_CONF_PENDING, &priv->status);
                mutex_unlock(&priv->mutex);
                return 0;
        }

        spin_lock_irqsave(&priv->lock, flags);

        ch_info = iwl3945_get_channel_info(priv, conf->channel->band,
                                           conf->channel->hw_value);
        if (!is_channel_valid(ch_info)) {
                IWL_DEBUG_SCAN("Channel %d [%d] is INVALID for this band.\n",
                               conf->channel->hw_value, conf->channel->band);
                IWL_DEBUG_MAC80211("leave - invalid channel\n");
                spin_unlock_irqrestore(&priv->lock, flags);
                ret = -EINVAL;
                goto out;
        }

        iwl3945_set_rxon_channel(priv, conf->channel->band, conf->channel->hw_value);

        iwl3945_set_flags_for_phymode(priv, conf->channel->band);

        /* The list of supported rates and rate mask can be different
         * for each phymode; since the phymode may have changed, reset
         * the rate mask to what mac80211 lists */
        iwl3945_set_rate(priv);

        spin_unlock_irqrestore(&priv->lock, flags);

#ifdef IEEE80211_CONF_CHANNEL_SWITCH
        if (conf->flags & IEEE80211_CONF_CHANNEL_SWITCH) {
                iwl3945_hw_channel_switch(priv, conf->channel);
                goto out;
        }
#endif

        iwl3945_radio_kill_sw(priv, !conf->radio_enabled);

        if (!conf->radio_enabled) {
                IWL_DEBUG_MAC80211("leave - radio disabled\n");
                goto out;
        }

        if (iwl3945_is_rfkill(priv)) {
                IWL_DEBUG_MAC80211("leave - RF kill\n");
                ret = -EIO;
                goto out;
        }

        iwl3945_set_rate(priv);

        if (memcmp(&priv->active_rxon,
                   &priv->staging_rxon, sizeof(priv->staging_rxon)))
                iwl3945_commit_rxon(priv);
        else
                IWL_DEBUG_INFO("No re-sending same RXON configuration.\n");

        IWL_DEBUG_MAC80211("leave\n");

out:
        clear_bit(STATUS_CONF_PENDING, &priv->status);
        mutex_unlock(&priv->mutex);
        return ret;
}

static void iwl3945_config_ap(struct iwl3945_priv *priv)
{
        int rc = 0;

        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                return;

        /* The following should be done only at AP bring up */
        if (!(iwl3945_is_associated(priv))) {

                /* RXON - unassoc (to set timing command) */
                priv->staging_rxon.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
                iwl3945_commit_rxon(priv);

                /* RXON Timing */
                memset(&priv->rxon_timing, 0, sizeof(struct iwl3945_rxon_time_cmd));
                iwl3945_setup_rxon_timing(priv);
                rc = iwl3945_send_cmd_pdu(priv, REPLY_RXON_TIMING,
                                sizeof(priv->rxon_timing), &priv->rxon_timing);
                if (rc)
                        IWL_WARNING("REPLY_RXON_TIMING failed - "
                                        "Attempting to continue.\n");

                /* FIXME: what should be the assoc_id for AP? */
                priv->staging_rxon.assoc_id = cpu_to_le16(priv->assoc_id);
                if (priv->assoc_capability & WLAN_CAPABILITY_SHORT_PREAMBLE)
                        priv->staging_rxon.flags |=
                                RXON_FLG_SHORT_PREAMBLE_MSK;
                else
                        priv->staging_rxon.flags &=
                                ~RXON_FLG_SHORT_PREAMBLE_MSK;

                if (priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK) {
                        if (priv->assoc_capability &
                                WLAN_CAPABILITY_SHORT_SLOT_TIME)
                                priv->staging_rxon.flags |=
                                        RXON_FLG_SHORT_SLOT_MSK;
                        else
                                priv->staging_rxon.flags &=
                                        ~RXON_FLG_SHORT_SLOT_MSK;

                        if (priv->iw_mode == NL80211_IFTYPE_ADHOC)
                                priv->staging_rxon.flags &=
                                        ~RXON_FLG_SHORT_SLOT_MSK;
                }
                /* restore RXON assoc */
                priv->staging_rxon.filter_flags |= RXON_FILTER_ASSOC_MSK;
                iwl3945_commit_rxon(priv);
                iwl3945_add_station(priv, iwl3945_broadcast_addr, 0, 0);
        }
        iwl3945_send_beacon_cmd(priv);

        /* FIXME - we need to add code here to detect a totally new
         * configuration, reset the AP, unassoc, rxon timing, assoc,
         * clear sta table, add BCAST sta... */
}

static int iwl3945_mac_config_interface(struct ieee80211_hw *hw,
                                        struct ieee80211_vif *vif,
                                    struct ieee80211_if_conf *conf)
{
        struct iwl3945_priv *priv = hw->priv;
        int rc;

        if (conf == NULL)
                return -EIO;

        if (priv->vif != vif) {
                IWL_DEBUG_MAC80211("leave - priv->vif != vif\n");
                return 0;
        }

        /* handle this temporarily here */
        if (priv->iw_mode == NL80211_IFTYPE_ADHOC &&
            conf->changed & IEEE80211_IFCC_BEACON) {
                struct sk_buff *beacon = ieee80211_beacon_get(hw, vif);
                if (!beacon)
                        return -ENOMEM;
                mutex_lock(&priv->mutex);
                rc = iwl3945_mac_beacon_update(hw, beacon);
                mutex_unlock(&priv->mutex);
                if (rc)
                        return rc;
        }

        if (!iwl3945_is_alive(priv))
                return -EAGAIN;

        mutex_lock(&priv->mutex);

        if (conf->bssid)
                IWL_DEBUG_MAC80211("bssid: %pM\n", conf->bssid);

/*
 * very dubious code was here; the probe filtering flag is never set:
 *
        if (unlikely(test_bit(STATUS_SCANNING, &priv->status)) &&
            !(priv->hw->flags & IEEE80211_HW_NO_PROBE_FILTERING)) {
 */

        if (priv->iw_mode == NL80211_IFTYPE_AP) {
                if (!conf->bssid) {
                        conf->bssid = priv->mac_addr;
                        memcpy(priv->bssid, priv->mac_addr, ETH_ALEN);
                        IWL_DEBUG_MAC80211("bssid was set to: %pM\n",
                                           conf->bssid);
                }
                if (priv->ibss_beacon)
                        dev_kfree_skb(priv->ibss_beacon);

                priv->ibss_beacon = ieee80211_beacon_get(hw, vif);
        }

        if (iwl3945_is_rfkill(priv))
                goto done;

        if (conf->bssid && !is_zero_ether_addr(conf->bssid) &&
            !is_multicast_ether_addr(conf->bssid)) {
                /* If there is currently a HW scan going on in the background
                 * then we need to cancel it else the RXON below will fail. */
                if (iwl3945_scan_cancel_timeout(priv, 100)) {
                        IWL_WARNING("Aborted scan still in progress "
                                    "after 100ms\n");
                        IWL_DEBUG_MAC80211("leaving - scan abort failed.\n");
                        mutex_unlock(&priv->mutex);
                        return -EAGAIN;
                }
                memcpy(priv->staging_rxon.bssid_addr, conf->bssid, ETH_ALEN);

                /* TODO: Audit driver for usage of these members and see
                 * if mac80211 deprecates them (priv->bssid looks like it
                 * shouldn't be there, but I haven't scanned the IBSS code
                 * to verify) - jpk */
                memcpy(priv->bssid, conf->bssid, ETH_ALEN);

                if (priv->iw_mode == NL80211_IFTYPE_AP)
                        iwl3945_config_ap(priv);
                else {
                        rc = iwl3945_commit_rxon(priv);
                        if ((priv->iw_mode == NL80211_IFTYPE_STATION) && rc)
                                iwl3945_add_station(priv,
                                        priv->active_rxon.bssid_addr, 1, 0);
                }

        } else {
                iwl3945_scan_cancel_timeout(priv, 100);
                priv->staging_rxon.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
                iwl3945_commit_rxon(priv);
        }

 done:
        IWL_DEBUG_MAC80211("leave\n");
        mutex_unlock(&priv->mutex);

        return 0;
}

static void iwl3945_configure_filter(struct ieee80211_hw *hw,
                                 unsigned int changed_flags,
                                 unsigned int *total_flags,
                                 int mc_count, struct dev_addr_list *mc_list)
{
        struct iwl3945_priv *priv = hw->priv;
        __le32 *filter_flags = &priv->staging_rxon.filter_flags;

        IWL_DEBUG_MAC80211("Enter: changed: 0x%x, total: 0x%x\n",
                        changed_flags, *total_flags);

        if (changed_flags & (FIF_OTHER_BSS | FIF_PROMISC_IN_BSS)) {
                if (*total_flags & (FIF_OTHER_BSS | FIF_PROMISC_IN_BSS))
                        *filter_flags |= RXON_FILTER_PROMISC_MSK;
                else
                        *filter_flags &= ~RXON_FILTER_PROMISC_MSK;
        }
        if (changed_flags & FIF_ALLMULTI) {
                if (*total_flags & FIF_ALLMULTI)
                        *filter_flags |= RXON_FILTER_ACCEPT_GRP_MSK;
                else
                        *filter_flags &= ~RXON_FILTER_ACCEPT_GRP_MSK;
        }
        if (changed_flags & FIF_CONTROL) {
                if (*total_flags & FIF_CONTROL)
                        *filter_flags |= RXON_FILTER_CTL2HOST_MSK;
                else
                        *filter_flags &= ~RXON_FILTER_CTL2HOST_MSK;
        }
        if (changed_flags & FIF_BCN_PRBRESP_PROMISC) {
                if (*total_flags & FIF_BCN_PRBRESP_PROMISC)
                        *filter_flags |= RXON_FILTER_BCON_AWARE_MSK;
                else
                        *filter_flags &= ~RXON_FILTER_BCON_AWARE_MSK;
        }

        /* We avoid iwl_commit_rxon here to commit the new filter flags
         * since mac80211 will call ieee80211_hw_config immediately.
         * (mc_list is not supported at this time). Otherwise, we need to
         * queue a background iwl_commit_rxon work.
         */

        *total_flags &= FIF_OTHER_BSS | FIF_ALLMULTI | FIF_PROMISC_IN_BSS |
                        FIF_BCN_PRBRESP_PROMISC | FIF_CONTROL;
}

static void iwl3945_mac_remove_interface(struct ieee80211_hw *hw,
                                     struct ieee80211_if_init_conf *conf)
{
        struct iwl3945_priv *priv = hw->priv;

        IWL_DEBUG_MAC80211("enter\n");

        mutex_lock(&priv->mutex);

        if (iwl3945_is_ready_rf(priv)) {
                iwl3945_scan_cancel_timeout(priv, 100);
                priv->staging_rxon.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
                iwl3945_commit_rxon(priv);
        }
        if (priv->vif == conf->vif) {
                priv->vif = NULL;
                memset(priv->bssid, 0, ETH_ALEN);
        }
        mutex_unlock(&priv->mutex);

        IWL_DEBUG_MAC80211("leave\n");
}

#define IWL_DELAY_NEXT_SCAN_AFTER_ASSOC (HZ*6)

static void iwl3945_bss_info_changed(struct ieee80211_hw *hw,
                                     struct ieee80211_vif *vif,
                                     struct ieee80211_bss_conf *bss_conf,
                                     u32 changes)
{
        struct iwl3945_priv *priv = hw->priv;

        IWL_DEBUG_MAC80211("changes = 0x%X\n", changes);

        if (changes & BSS_CHANGED_ERP_PREAMBLE) {
                IWL_DEBUG_MAC80211("ERP_PREAMBLE %d\n",
                                   bss_conf->use_short_preamble);
                if (bss_conf->use_short_preamble)
                        priv->staging_rxon.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
                else
                        priv->staging_rxon.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
        }

        if (changes & BSS_CHANGED_ERP_CTS_PROT) {
                IWL_DEBUG_MAC80211("ERP_CTS %d\n", bss_conf->use_cts_prot);
                if (bss_conf->use_cts_prot && (priv->band != IEEE80211_BAND_5GHZ))
                        priv->staging_rxon.flags |= RXON_FLG_TGG_PROTECT_MSK;
                else
                        priv->staging_rxon.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
        }

        if (changes & BSS_CHANGED_ASSOC) {
                IWL_DEBUG_MAC80211("ASSOC %d\n", bss_conf->assoc);
                /* This should never happen as this function should
                 * never be called from interrupt context. */
                if (WARN_ON_ONCE(in_interrupt()))
                        return;
                if (bss_conf->assoc) {
                        priv->assoc_id = bss_conf->aid;
                        priv->beacon_int = bss_conf->beacon_int;
                        priv->timestamp0 = bss_conf->timestamp & 0xFFFFFFFF;
                        priv->timestamp1 = (bss_conf->timestamp >> 32) &
                                             0xFFFFFFFF;
                        priv->assoc_capability = bss_conf->assoc_capability;
                        priv->next_scan_jiffies = jiffies +
                                        IWL_DELAY_NEXT_SCAN_AFTER_ASSOC;
                        mutex_lock(&priv->mutex);
                        iwl3945_post_associate(priv);
                        mutex_unlock(&priv->mutex);
                } else {
                        priv->assoc_id = 0;
                        IWL_DEBUG_MAC80211("DISASSOC %d\n", bss_conf->assoc);
                }
        } else if (changes && iwl3945_is_associated(priv) && priv->assoc_id) {
                        IWL_DEBUG_MAC80211("Associated Changes %d\n", changes);
                        iwl3945_send_rxon_assoc(priv);
        }

}

static int iwl3945_mac_hw_scan(struct ieee80211_hw *hw, u8 *ssid, size_t len)
{
        int rc = 0;
        unsigned long flags;
        struct iwl3945_priv *priv = hw->priv;
        DECLARE_SSID_BUF(ssid_buf);

        IWL_DEBUG_MAC80211("enter\n");

        mutex_lock(&priv->mutex);
        spin_lock_irqsave(&priv->lock, flags);

        if (!iwl3945_is_ready_rf(priv)) {
                rc = -EIO;
                IWL_DEBUG_MAC80211("leave - not ready or exit pending\n");
                goto out_unlock;
        }

        if (priv->iw_mode == NL80211_IFTYPE_AP) {       /* APs don't scan */
                rc = -EIO;
                IWL_ERROR("ERROR: APs don't scan\n");
                goto out_unlock;
        }

        /* we don't schedule scan within next_scan_jiffies period */
        if (priv->next_scan_jiffies &&
                        time_after(priv->next_scan_jiffies, jiffies)) {
                rc = -EAGAIN;
                goto out_unlock;
        }
        /* if we just finished scan ask for delay for a broadcast scan */
        if ((len == 0) && priv->last_scan_jiffies &&
            time_after(priv->last_scan_jiffies + IWL_DELAY_NEXT_SCAN,
                       jiffies)) {
                rc = -EAGAIN;
                goto out_unlock;
        }
        if (len) {
                IWL_DEBUG_SCAN("direct scan for %s [%d]\n ",
                               print_ssid(ssid_buf, ssid, len), (int)len);

                priv->one_direct_scan = 1;
                priv->direct_ssid_len = (u8)
                    min((u8) len, (u8) IW_ESSID_MAX_SIZE);
                memcpy(priv->direct_ssid, ssid, priv->direct_ssid_len);
        } else
                priv->one_direct_scan = 0;

        rc = iwl3945_scan_initiate(priv);

        IWL_DEBUG_MAC80211("leave\n");

out_unlock:
        spin_unlock_irqrestore(&priv->lock, flags);
        mutex_unlock(&priv->mutex);

        return rc;
}

static int iwl3945_mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
                           const u8 *local_addr, const u8 *addr,
                           struct ieee80211_key_conf *key)
{
        struct iwl3945_priv *priv = hw->priv;
        int rc = 0;
        u8 sta_id;

        IWL_DEBUG_MAC80211("enter\n");

        if (!iwl3945_param_hwcrypto) {
                IWL_DEBUG_MAC80211("leave - hwcrypto disabled\n");
                return -EOPNOTSUPP;
        }

        if (is_zero_ether_addr(addr))
                /* only support pairwise keys */
                return -EOPNOTSUPP;

        sta_id = iwl3945_hw_find_station(priv, addr);
        if (sta_id == IWL_INVALID_STATION) {
                IWL_DEBUG_MAC80211("leave - %pM not in station map.\n",
                                   addr);
                return -EINVAL;
        }

        mutex_lock(&priv->mutex);

        iwl3945_scan_cancel_timeout(priv, 100);

        switch (cmd) {
        case  SET_KEY:
                rc = iwl3945_update_sta_key_info(priv, key, sta_id);
                if (!rc) {
                        iwl3945_set_rxon_hwcrypto(priv, 1);
                        iwl3945_commit_rxon(priv);
                        key->hw_key_idx = sta_id;
                        IWL_DEBUG_MAC80211("set_key success, using hwcrypto\n");
                        key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
                }
                break;
        case DISABLE_KEY:
                rc = iwl3945_clear_sta_key_info(priv, sta_id);
                if (!rc) {
                        iwl3945_set_rxon_hwcrypto(priv, 0);
                        iwl3945_commit_rxon(priv);
                        IWL_DEBUG_MAC80211("disable hwcrypto key\n");
                }
                break;
        default:
                rc = -EINVAL;
        }

        IWL_DEBUG_MAC80211("leave\n");
        mutex_unlock(&priv->mutex);

        return rc;
}

static int iwl3945_mac_conf_tx(struct ieee80211_hw *hw, u16 queue,
                           const struct ieee80211_tx_queue_params *params)
{
        struct iwl3945_priv *priv = hw->priv;
        unsigned long flags;
        int q;

        IWL_DEBUG_MAC80211("enter\n");

        if (!iwl3945_is_ready_rf(priv)) {
                IWL_DEBUG_MAC80211("leave - RF not ready\n");
                return -EIO;
        }

        if (queue >= AC_NUM) {
                IWL_DEBUG_MAC80211("leave - queue >= AC_NUM %d\n", queue);
                return 0;
        }

        if (!priv->qos_data.qos_enable) {
                priv->qos_data.qos_active = 0;
                IWL_DEBUG_MAC80211("leave - qos not enabled\n");
                return 0;
        }
        q = AC_NUM - 1 - queue;

        spin_lock_irqsave(&priv->lock, flags);

        priv->qos_data.def_qos_parm.ac[q].cw_min = cpu_to_le16(params->cw_min);
        priv->qos_data.def_qos_parm.ac[q].cw_max = cpu_to_le16(params->cw_max);
        priv->qos_data.def_qos_parm.ac[q].aifsn = params->aifs;
        priv->qos_data.def_qos_parm.ac[q].edca_txop =
                        cpu_to_le16((params->txop * 32));

        priv->qos_data.def_qos_parm.ac[q].reserved1 = 0;
        priv->qos_data.qos_active = 1;

        spin_unlock_irqrestore(&priv->lock, flags);

        mutex_lock(&priv->mutex);
        if (priv->iw_mode == NL80211_IFTYPE_AP)
                iwl3945_activate_qos(priv, 1);
        else if (priv->assoc_id && iwl3945_is_associated(priv))
                iwl3945_activate_qos(priv, 0);

        mutex_unlock(&priv->mutex);

        IWL_DEBUG_MAC80211("leave\n");
        return 0;
}

static int iwl3945_mac_get_tx_stats(struct ieee80211_hw *hw,
                                struct ieee80211_tx_queue_stats *stats)
{
        struct iwl3945_priv *priv = hw->priv;
        int i, avail;
        struct iwl3945_tx_queue *txq;
        struct iwl3945_queue *q;
        unsigned long flags;

        IWL_DEBUG_MAC80211("enter\n");

        if (!iwl3945_is_ready_rf(priv)) {
                IWL_DEBUG_MAC80211("leave - RF not ready\n");
                return -EIO;
        }

        spin_lock_irqsave(&priv->lock, flags);

        for (i = 0; i < AC_NUM; i++) {
                txq = &priv->txq[i];
                q = &txq->q;
                avail = iwl3945_queue_space(q);

                stats[i].len = q->n_window - avail;
                stats[i].limit = q->n_window - q->high_mark;
                stats[i].count = q->n_window;

        }
        spin_unlock_irqrestore(&priv->lock, flags);

        IWL_DEBUG_MAC80211("leave\n");

        return 0;
}

static int iwl3945_mac_get_stats(struct ieee80211_hw *hw,
                             struct ieee80211_low_level_stats *stats)
{
        IWL_DEBUG_MAC80211("enter\n");
        IWL_DEBUG_MAC80211("leave\n");

        return 0;
}

static void iwl3945_mac_reset_tsf(struct ieee80211_hw *hw)
{
        struct iwl3945_priv *priv = hw->priv;
        unsigned long flags;

        mutex_lock(&priv->mutex);
        IWL_DEBUG_MAC80211("enter\n");

        iwl3945_reset_qos(priv);

        spin_lock_irqsave(&priv->lock, flags);
        priv->assoc_id = 0;
        priv->assoc_capability = 0;
        priv->call_post_assoc_from_beacon = 0;

        /* new association get rid of ibss beacon skb */
        if (priv->ibss_beacon)
                dev_kfree_skb(priv->ibss_beacon);

        priv->ibss_beacon = NULL;

        priv->beacon_int = priv->hw->conf.beacon_int;
        priv->timestamp1 = 0;
        priv->timestamp0 = 0;
        if ((priv->iw_mode == NL80211_IFTYPE_STATION))
                priv->beacon_int = 0;

        spin_unlock_irqrestore(&priv->lock, flags);

        if (!iwl3945_is_ready_rf(priv)) {
                IWL_DEBUG_MAC80211("leave - not ready\n");
                mutex_unlock(&priv->mutex);
                return;
        }

        /* we are restarting association process
         * clear RXON_FILTER_ASSOC_MSK bit
        */
        if (priv->iw_mode != NL80211_IFTYPE_AP) {
                iwl3945_scan_cancel_timeout(priv, 100);
                priv->staging_rxon.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
                iwl3945_commit_rxon(priv);
        }

        /* Per mac80211.h: This is only used in IBSS mode... */
        if (priv->iw_mode != NL80211_IFTYPE_ADHOC) {

                IWL_DEBUG_MAC80211("leave - not in IBSS\n");
                mutex_unlock(&priv->mutex);
                return;
        }

        iwl3945_set_rate(priv);

        mutex_unlock(&priv->mutex);

        IWL_DEBUG_MAC80211("leave\n");

}

static int iwl3945_mac_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb)
{
        struct iwl3945_priv *priv = hw->priv;
        unsigned long flags;

        IWL_DEBUG_MAC80211("enter\n");

        if (!iwl3945_is_ready_rf(priv)) {
                IWL_DEBUG_MAC80211("leave - RF not ready\n");
                return -EIO;
        }

        if (priv->iw_mode != NL80211_IFTYPE_ADHOC) {
                IWL_DEBUG_MAC80211("leave - not IBSS\n");
                return -EIO;
        }

        spin_lock_irqsave(&priv->lock, flags);

        if (priv->ibss_beacon)
                dev_kfree_skb(priv->ibss_beacon);

        priv->ibss_beacon = skb;

        priv->assoc_id = 0;

        IWL_DEBUG_MAC80211("leave\n");
        spin_unlock_irqrestore(&priv->lock, flags);

        iwl3945_reset_qos(priv);

        iwl3945_post_associate(priv);


        return 0;
}

/*****************************************************************************
 *
 * sysfs attributes
 *
 *****************************************************************************/

#ifdef CONFIG_IWL3945_DEBUG

/*
 * The following adds a new attribute to the sysfs representation
 * of this device driver (i.e. a new file in /sys/bus/pci/drivers/iwl/)
 * used for controlling the debug level.
 *
 * See the level definitions in iwl for details.
 */

static ssize_t show_debug_level(struct device_driver *d, char *buf)
{
        return sprintf(buf, "0x%08X\n", iwl3945_debug_level);
}
static ssize_t store_debug_level(struct device_driver *d,
                                 const char *buf, size_t count)
{
        char *p = (char *)buf;
        u32 val;

        val = simple_strtoul(p, &p, 0);
        if (p == buf)
                printk(KERN_INFO DRV_NAME
                       ": %s is not in hex or decimal form.\n", buf);
        else
                iwl3945_debug_level = val;

        return strnlen(buf, count);
}

static DRIVER_ATTR(debug_level, S_IWUSR | S_IRUGO,
                   show_debug_level, store_debug_level);

#endif /* CONFIG_IWL3945_DEBUG */

static ssize_t show_temperature(struct device *d,
                                struct device_attribute *attr, char *buf)
{
        struct iwl3945_priv *priv = (struct iwl3945_priv *)d->driver_data;

        if (!iwl3945_is_alive(priv))
                return -EAGAIN;

        return sprintf(buf, "%d\n", iwl3945_hw_get_temperature(priv));
}

static DEVICE_ATTR(temperature, S_IRUGO, show_temperature, NULL);

static ssize_t show_tx_power(struct device *d,
                             struct device_attribute *attr, char *buf)
{
        struct iwl3945_priv *priv = (struct iwl3945_priv *)d->driver_data;
        return sprintf(buf, "%d\n", priv->user_txpower_limit);
}

static ssize_t store_tx_power(struct device *d,
                              struct device_attribute *attr,
                              const char *buf, size_t count)
{
        struct iwl3945_priv *priv = (struct iwl3945_priv *)d->driver_data;
        char *p = (char *)buf;
        u32 val;

        val = simple_strtoul(p, &p, 10);
        if (p == buf)
                printk(KERN_INFO DRV_NAME
                       ": %s is not in decimal form.\n", buf);
        else
                iwl3945_hw_reg_set_txpower(priv, val);

        return count;
}

static DEVICE_ATTR(tx_power, S_IWUSR | S_IRUGO, show_tx_power, store_tx_power);

static ssize_t show_flags(struct device *d,
                          struct device_attribute *attr, char *buf)
{
        struct iwl3945_priv *priv = (struct iwl3945_priv *)d->driver_data;

        return sprintf(buf, "0x%04X\n", priv->active_rxon.flags);
}

static ssize_t store_flags(struct device *d,
                           struct device_attribute *attr,
                           const char *buf, size_t count)
{
        struct iwl3945_priv *priv = (struct iwl3945_priv *)d->driver_data;
        u32 flags = simple_strtoul(buf, NULL, 0);

        mutex_lock(&priv->mutex);
        if (le32_to_cpu(priv->staging_rxon.flags) != flags) {
                /* Cancel any currently running scans... */
                if (iwl3945_scan_cancel_timeout(priv, 100))
                        IWL_WARNING("Could not cancel scan.\n");
                else {
                        IWL_DEBUG_INFO("Committing rxon.flags = 0x%04X\n",
                                       flags);
                        priv->staging_rxon.flags = cpu_to_le32(flags);
                        iwl3945_commit_rxon(priv);
                }
        }
        mutex_unlock(&priv->mutex);

        return count;
}

static DEVICE_ATTR(flags, S_IWUSR | S_IRUGO, show_flags, store_flags);

static ssize_t show_filter_flags(struct device *d,
                                 struct device_attribute *attr, char *buf)
{
        struct iwl3945_priv *priv = (struct iwl3945_priv *)d->driver_data;

        return sprintf(buf, "0x%04X\n",
                le32_to_cpu(priv->active_rxon.filter_flags));
}

static ssize_t store_filter_flags(struct device *d,
                                  struct device_attribute *attr,
                                  const char *buf, size_t count)
{
        struct iwl3945_priv *priv = (struct iwl3945_priv *)d->driver_data;
        u32 filter_flags = simple_strtoul(buf, NULL, 0);

        mutex_lock(&priv->mutex);
        if (le32_to_cpu(priv->staging_rxon.filter_flags) != filter_flags) {
                /* Cancel any currently running scans... */
                if (iwl3945_scan_cancel_timeout(priv, 100))
                        IWL_WARNING("Could not cancel scan.\n");
                else {
                        IWL_DEBUG_INFO("Committing rxon.filter_flags = "
                                       "0x%04X\n", filter_flags);
                        priv->staging_rxon.filter_flags =
                                cpu_to_le32(filter_flags);
                        iwl3945_commit_rxon(priv);
                }
        }
        mutex_unlock(&priv->mutex);

        return count;
}

static DEVICE_ATTR(filter_flags, S_IWUSR | S_IRUGO, show_filter_flags,
                   store_filter_flags);

#ifdef CONFIG_IWL3945_SPECTRUM_MEASUREMENT

static ssize_t show_measurement(struct device *d,
                                struct device_attribute *attr, char *buf)
{
        struct iwl3945_priv *priv = dev_get_drvdata(d);
        struct iwl3945_spectrum_notification measure_report;
        u32 size = sizeof(measure_report), len = 0, ofs = 0;
        u8 *data = (u8 *)&measure_report;
        unsigned long flags;

        spin_lock_irqsave(&priv->lock, flags);
        if (!(priv->measurement_status & MEASUREMENT_READY)) {
                spin_unlock_irqrestore(&priv->lock, flags);
                return 0;
        }
        memcpy(&measure_report, &priv->measure_report, size);
        priv->measurement_status = 0;
        spin_unlock_irqrestore(&priv->lock, flags);

        while (size && (PAGE_SIZE - len)) {
                hex_dump_to_buffer(data + ofs, size, 16, 1, buf + len,
                                   PAGE_SIZE - len, 1);
                len = strlen(buf);
                if (PAGE_SIZE - len)
                        buf[len++] = '\n';

                ofs += 16;
                size -= min(size, 16U);
        }

        return len;
}

static ssize_t store_measurement(struct device *d,
                                 struct device_attribute *attr,
                                 const char *buf, size_t count)
{
        struct iwl3945_priv *priv = dev_get_drvdata(d);
        struct ieee80211_measurement_params params = {
                .channel = le16_to_cpu(priv->active_rxon.channel),
                .start_time = cpu_to_le64(priv->last_tsf),
                .duration = cpu_to_le16(1),
        };
        u8 type = IWL_MEASURE_BASIC;
        u8 buffer[32];
        u8 channel;

        if (count) {
                char *p = buffer;
                strncpy(buffer, buf, min(sizeof(buffer), count));
                channel = simple_strtoul(p, NULL, 0);
                if (channel)
                        params.channel = channel;

                p = buffer;
                while (*p && *p != ' ')
                        p++;
                if (*p)
                        type = simple_strtoul(p + 1, NULL, 0);
        }

        IWL_DEBUG_INFO("Invoking measurement of type %d on "
                       "channel %d (for '%s')\n", type, params.channel, buf);
        iwl3945_get_measurement(priv, &params, type);

        return count;
}

static DEVICE_ATTR(measurement, S_IRUSR | S_IWUSR,
                   show_measurement, store_measurement);
#endif /* CONFIG_IWL3945_SPECTRUM_MEASUREMENT */

static ssize_t store_retry_rate(struct device *d,
                                struct device_attribute *attr,
                                const char *buf, size_t count)
{
        struct iwl3945_priv *priv = dev_get_drvdata(d);

        priv->retry_rate = simple_strtoul(buf, NULL, 0);
        if (priv->retry_rate <= 0)
                priv->retry_rate = 1;

        return count;
}

static ssize_t show_retry_rate(struct device *d,
                               struct device_attribute *attr, char *buf)
{
        struct iwl3945_priv *priv = dev_get_drvdata(d);
        return sprintf(buf, "%d", priv->retry_rate);
}

static DEVICE_ATTR(retry_rate, S_IWUSR | S_IRUSR, show_retry_rate,
                   store_retry_rate);

static ssize_t store_power_level(struct device *d,
                                 struct device_attribute *attr,
                                 const char *buf, size_t count)
{
        struct iwl3945_priv *priv = dev_get_drvdata(d);
        int rc;
        int mode;

        mode = simple_strtoul(buf, NULL, 0);
        mutex_lock(&priv->mutex);

        if (!iwl3945_is_ready(priv)) {
                rc = -EAGAIN;
                goto out;
        }

        if ((mode < 1) || (mode > IWL_POWER_LIMIT) || (mode == IWL_POWER_AC))
                mode = IWL_POWER_AC;
        else
                mode |= IWL_POWER_ENABLED;

        if (mode != priv->power_mode) {
                rc = iwl3945_send_power_mode(priv, IWL_POWER_LEVEL(mode));
                if (rc) {
                        IWL_DEBUG_MAC80211("failed setting power mode.\n");
                        goto out;
                }
                priv->power_mode = mode;
        }

        rc = count;

 out:
        mutex_unlock(&priv->mutex);
        return rc;
}

#define MAX_WX_STRING 80

/* Values are in microsecond */
static const s32 timeout_duration[] = {
        350000,
        250000,
        75000,
        37000,
        25000,
};
static const s32 period_duration[] = {
        400000,
        700000,
        1000000,
        1000000,
        1000000
};

static ssize_t show_power_level(struct device *d,
                                struct device_attribute *attr, char *buf)
{
        struct iwl3945_priv *priv = dev_get_drvdata(d);
        int level = IWL_POWER_LEVEL(priv->power_mode);
        char *p = buf;

        p += sprintf(p, "%d ", level);
        switch (level) {
        case IWL_POWER_MODE_CAM:
        case IWL_POWER_AC:
                p += sprintf(p, "(AC)");
                break;
        case IWL_POWER_BATTERY:
                p += sprintf(p, "(BATTERY)");
                break;
        default:
                p += sprintf(p,
                             "(Timeout %dms, Period %dms)",
                             timeout_duration[level - 1] / 1000,
                             period_duration[level - 1] / 1000);
        }

        if (!(priv->power_mode & IWL_POWER_ENABLED))
                p += sprintf(p, " OFF\n");
        else
                p += sprintf(p, " \n");

        return p - buf + 1;

}

static DEVICE_ATTR(power_level, S_IWUSR | S_IRUSR, show_power_level,
                   store_power_level);

static ssize_t show_channels(struct device *d,
                             struct device_attribute *attr, char *buf)
{
        /* all this shit doesn't belong into sysfs anyway */
        return 0;
}

static DEVICE_ATTR(channels, S_IRUSR, show_channels, NULL);

static ssize_t show_statistics(struct device *d,
                               struct device_attribute *attr, char *buf)
{
        struct iwl3945_priv *priv = dev_get_drvdata(d);
        u32 size = sizeof(struct iwl3945_notif_statistics);
        u32 len = 0, ofs = 0;
        u8 *data = (u8 *)&priv->statistics;
        int rc = 0;

        if (!iwl3945_is_alive(priv))
                return -EAGAIN;

        mutex_lock(&priv->mutex);
        rc = iwl3945_send_statistics_request(priv);
        mutex_unlock(&priv->mutex);

        if (rc) {
                len = sprintf(buf,
                              "Error sending statistics request: 0x%08X\n", rc);
                return len;
        }

        while (size && (PAGE_SIZE - len)) {
                hex_dump_to_buffer(data + ofs, size, 16, 1, buf + len,
                                   PAGE_SIZE - len, 1);
                len = strlen(buf);
                if (PAGE_SIZE - len)
                        buf[len++] = '\n';

                ofs += 16;
                size -= min(size, 16U);
        }

        return len;
}

static DEVICE_ATTR(statistics, S_IRUGO, show_statistics, NULL);

static ssize_t show_antenna(struct device *d,
                            struct device_attribute *attr, char *buf)
{
        struct iwl3945_priv *priv = dev_get_drvdata(d);

        if (!iwl3945_is_alive(priv))
                return -EAGAIN;

        return sprintf(buf, "%d\n", priv->antenna);
}

static ssize_t store_antenna(struct device *d,
                             struct device_attribute *attr,
                             const char *buf, size_t count)
{
        int ant;
        struct iwl3945_priv *priv = dev_get_drvdata(d);

        if (count == 0)
                return 0;

        if (sscanf(buf, "%1i", &ant) != 1) {
                IWL_DEBUG_INFO("not in hex or decimal form.\n");
                return count;
        }

        if ((ant >= 0) && (ant <= 2)) {
                IWL_DEBUG_INFO("Setting antenna select to %d.\n", ant);
                priv->antenna = (enum iwl3945_antenna)ant;
        } else
                IWL_DEBUG_INFO("Bad antenna select value %d.\n", ant);


        return count;
}

static DEVICE_ATTR(antenna, S_IWUSR | S_IRUGO, show_antenna, store_antenna);

static ssize_t show_status(struct device *d,
                           struct device_attribute *attr, char *buf)
{
        struct iwl3945_priv *priv = (struct iwl3945_priv *)d->driver_data;
        if (!iwl3945_is_alive(priv))
                return -EAGAIN;
        return sprintf(buf, "0x%08x\n", (int)priv->status);
}

static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);

static ssize_t dump_error_log(struct device *d,
                              struct device_attribute *attr,
                              const char *buf, size_t count)
{
        char *p = (char *)buf;

        if (p[0] == '1')
                iwl3945_dump_nic_error_log((struct iwl3945_priv *)d->driver_data);

        return strnlen(buf, count);
}

static DEVICE_ATTR(dump_errors, S_IWUSR, NULL, dump_error_log);

static ssize_t dump_event_log(struct device *d,
                              struct device_attribute *attr,
                              const char *buf, size_t count)
{
        char *p = (char *)buf;

        if (p[0] == '1')
                iwl3945_dump_nic_event_log((struct iwl3945_priv *)d->driver_data);

        return strnlen(buf, count);
}

static DEVICE_ATTR(dump_events, S_IWUSR, NULL, dump_event_log);

/*****************************************************************************
 *
 * driver setup and tear down
 *
 *****************************************************************************/

static void iwl3945_setup_deferred_work(struct iwl3945_priv *priv)
{
        priv->workqueue = create_workqueue(DRV_NAME);

        init_waitqueue_head(&priv->wait_command_queue);

        INIT_WORK(&priv->up, iwl3945_bg_up);
        INIT_WORK(&priv->restart, iwl3945_bg_restart);
        INIT_WORK(&priv->rx_replenish, iwl3945_bg_rx_replenish);
        INIT_WORK(&priv->scan_completed, iwl3945_bg_scan_completed);
        INIT_WORK(&priv->request_scan, iwl3945_bg_request_scan);
        INIT_WORK(&priv->abort_scan, iwl3945_bg_abort_scan);
        INIT_WORK(&priv->rf_kill, iwl3945_bg_rf_kill);
        INIT_WORK(&priv->beacon_update, iwl3945_bg_beacon_update);
        INIT_DELAYED_WORK(&priv->init_alive_start, iwl3945_bg_init_alive_start);
        INIT_DELAYED_WORK(&priv->alive_start, iwl3945_bg_alive_start);
        INIT_DELAYED_WORK(&priv->scan_check, iwl3945_bg_scan_check);

        iwl3945_hw_setup_deferred_work(priv);

        tasklet_init(&priv->irq_tasklet, (void (*)(unsigned long))
                     iwl3945_irq_tasklet, (unsigned long)priv);
}

static void iwl3945_cancel_deferred_work(struct iwl3945_priv *priv)
{
        iwl3945_hw_cancel_deferred_work(priv);

        cancel_delayed_work_sync(&priv->init_alive_start);
        cancel_delayed_work(&priv->scan_check);
        cancel_delayed_work(&priv->alive_start);
        cancel_work_sync(&priv->beacon_update);
}

static struct attribute *iwl3945_sysfs_entries[] = {
        &dev_attr_antenna.attr,
        &dev_attr_channels.attr,
        &dev_attr_dump_errors.attr,
        &dev_attr_dump_events.attr,
        &dev_attr_flags.attr,
        &dev_attr_filter_flags.attr,
#ifdef CONFIG_IWL3945_SPECTRUM_MEASUREMENT
        &dev_attr_measurement.attr,
#endif
        &dev_attr_power_level.attr,
        &dev_attr_retry_rate.attr,
        &dev_attr_statistics.attr,
        &dev_attr_status.attr,
        &dev_attr_temperature.attr,
        &dev_attr_tx_power.attr,

        NULL
};

static struct attribute_group iwl3945_attribute_group = {
        .name = NULL,           /* put in device directory */
        .attrs = iwl3945_sysfs_entries,
};

static struct ieee80211_ops iwl3945_hw_ops = {
        .tx = iwl3945_mac_tx,
        .start = iwl3945_mac_start,
        .stop = iwl3945_mac_stop,
        .add_interface = iwl3945_mac_add_interface,
        .remove_interface = iwl3945_mac_remove_interface,
        .config = iwl3945_mac_config,
        .config_interface = iwl3945_mac_config_interface,
        .configure_filter = iwl3945_configure_filter,
        .set_key = iwl3945_mac_set_key,
        .get_stats = iwl3945_mac_get_stats,
        .get_tx_stats = iwl3945_mac_get_tx_stats,
        .conf_tx = iwl3945_mac_conf_tx,
        .reset_tsf = iwl3945_mac_reset_tsf,
        .bss_info_changed = iwl3945_bss_info_changed,
        .hw_scan = iwl3945_mac_hw_scan
};

static int iwl3945_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        int err = 0;
        struct iwl3945_priv *priv;
        struct ieee80211_hw *hw;
        struct iwl_3945_cfg *cfg = (struct iwl_3945_cfg *)(ent->driver_data);
        unsigned long flags;

        /***********************
         * 1. Allocating HW data
         * ********************/

        /* Disabling hardware scan means that mac80211 will perform scans
         * "the hard way", rather than using device's scan. */
        if (iwl3945_param_disable_hw_scan) {
                IWL_DEBUG_INFO("Disabling hw_scan\n");
                iwl3945_hw_ops.hw_scan = NULL;
        }

        if ((iwl3945_param_queues_num > IWL39_MAX_NUM_QUEUES) ||
            (iwl3945_param_queues_num < IWL_MIN_NUM_QUEUES)) {
                IWL_ERROR("invalid queues_num, should be between %d and %d\n",
                          IWL_MIN_NUM_QUEUES, IWL39_MAX_NUM_QUEUES);
                err = -EINVAL;
                goto out;
        }

        /* mac80211 allocates memory for this device instance, including
         *   space for this driver's private structure */
        hw = ieee80211_alloc_hw(sizeof(struct iwl3945_priv), &iwl3945_hw_ops);
        if (hw == NULL) {
                IWL_ERROR("Can not allocate network device\n");
                err = -ENOMEM;
                goto out;
        }

        SET_IEEE80211_DEV(hw, &pdev->dev);

        priv = hw->priv;
        priv->hw = hw;
        priv->pci_dev = pdev;
        priv->cfg = cfg;

        IWL_DEBUG_INFO("*** LOAD DRIVER ***\n");
        hw->rate_control_algorithm = "iwl-3945-rs";
        hw->sta_data_size = sizeof(struct iwl3945_sta_priv);

        /* Select antenna (may be helpful if only one antenna is connected) */
        priv->antenna = (enum iwl3945_antenna)iwl3945_param_antenna;
#ifdef CONFIG_IWL3945_DEBUG
        iwl3945_debug_level = iwl3945_param_debug;
        atomic_set(&priv->restrict_refcnt, 0);
#endif

        /* Tell mac80211 our characteristics */
        hw->flags = IEEE80211_HW_SIGNAL_DBM |
                    IEEE80211_HW_NOISE_DBM;

        hw->wiphy->interface_modes =
                BIT(NL80211_IFTYPE_STATION) |
                BIT(NL80211_IFTYPE_ADHOC);

        hw->wiphy->fw_handles_regulatory = true;

        /* 4 EDCA QOS priorities */
        hw->queues = 4;

        /***************************
         * 2. Initializing PCI bus
         * *************************/
        if (pci_enable_device(pdev)) {
                err = -ENODEV;
                goto out_ieee80211_free_hw;
        }

        pci_set_master(pdev);

        err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
        if (!err)
                err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
        if (err) {
                printk(KERN_WARNING DRV_NAME ": No suitable DMA available.\n");
                goto out_pci_disable_device;
        }

        pci_set_drvdata(pdev, priv);
        err = pci_request_regions(pdev, DRV_NAME);
        if (err)
                goto out_pci_disable_device;

        /***********************
         * 3. Read REV Register
         * ********************/
        priv->hw_base = pci_iomap(pdev, 0, 0);
        if (!priv->hw_base) {
                err = -ENODEV;
                goto out_pci_release_regions;
        }

        IWL_DEBUG_INFO("pci_resource_len = 0x%08llx\n",
                        (unsigned long long) pci_resource_len(pdev, 0));
        IWL_DEBUG_INFO("pci_resource_base = %p\n", priv->hw_base);

        /* We disable the RETRY_TIMEOUT register (0x41) to keep
         * PCI Tx retries from interfering with C3 CPU state */
        pci_write_config_byte(pdev, 0x41, 0x00);

        /* nic init */
        iwl3945_set_bit(priv, CSR_GIO_CHICKEN_BITS,
                        CSR_GIO_CHICKEN_BITS_REG_BIT_DIS_L0S_EXIT_TIMER);

        iwl3945_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
        err = iwl3945_poll_bit(priv, CSR_GP_CNTRL,
                               CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
                               CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
        if (err < 0) {
                IWL_DEBUG_INFO("Failed to init the card\n");
                goto out_remove_sysfs;
        }

        /***********************
         * 4. Read EEPROM
         * ********************/
        /* Read the EEPROM */
        err = iwl3945_eeprom_init(priv);
        if (err) {
                IWL_ERROR("Unable to init EEPROM\n");
                goto out_remove_sysfs;
        }
        /* MAC Address location in EEPROM same for 3945/4965 */
        get_eeprom_mac(priv, priv->mac_addr);
        IWL_DEBUG_INFO("MAC address: %pM\n", priv->mac_addr);
        SET_IEEE80211_PERM_ADDR(priv->hw, priv->mac_addr);

        /***********************
         * 5. Setup HW Constants
         * ********************/
        /* Device-specific setup */
        if (iwl3945_hw_set_hw_setting(priv)) {
                IWL_ERROR("failed to set hw settings\n");
                goto out_iounmap;
        }

        /***********************
         * 6. Setup priv
         * ********************/
        priv->retry_rate = 1;
        priv->ibss_beacon = NULL;

        spin_lock_init(&priv->lock);
        spin_lock_init(&priv->power_data.lock);
        spin_lock_init(&priv->sta_lock);
        spin_lock_init(&priv->hcmd_lock);

        INIT_LIST_HEAD(&priv->free_frames);
        mutex_init(&priv->mutex);

        /* Clear the driver's (not device's) station table */
        iwl3945_clear_stations_table(priv);

        priv->data_retry_limit = -1;
        priv->ieee_channels = NULL;
        priv->ieee_rates = NULL;
        priv->band = IEEE80211_BAND_2GHZ;

        priv->iw_mode = NL80211_IFTYPE_STATION;

        if (iwl3945_param_qos_enable)
                priv->qos_data.qos_enable = 1;

        iwl3945_reset_qos(priv);

        priv->qos_data.qos_active = 0;
        priv->qos_data.qos_cap.val = 0;


        priv->rates_mask = IWL_RATES_MASK;
        /* If power management is turned on, default to AC mode */
        priv->power_mode = IWL_POWER_AC;
        priv->user_txpower_limit = IWL_DEFAULT_TX_POWER;

        err = iwl3945_init_channel_map(priv);
        if (err) {
                IWL_ERROR("initializing regulatory failed: %d\n", err);
                goto out_release_irq;
        }

        err = iwl3945_init_geos(priv);
        if (err) {
                IWL_ERROR("initializing geos failed: %d\n", err);
                goto out_free_channel_map;
        }

        printk(KERN_INFO DRV_NAME
                ": Detected Intel Wireless WiFi Link %s\n", priv->cfg->name);

        /***********************************
         * 7. Initialize Module Parameters
         * **********************************/

        /* Initialize module parameter values here */
        /* Disable radio (SW RF KILL) via parameter when loading driver */
        if (iwl3945_param_disable) {
                set_bit(STATUS_RF_KILL_SW, &priv->status);
                IWL_DEBUG_INFO("Radio disabled.\n");
        }


        /***********************
         * 8. Setup Services
         * ********************/

        spin_lock_irqsave(&priv->lock, flags);
        iwl3945_disable_interrupts(priv);
        spin_unlock_irqrestore(&priv->lock, flags);

        err = sysfs_create_group(&pdev->dev.kobj, &iwl3945_attribute_group);
        if (err) {
                IWL_ERROR("failed to create sysfs device attributes\n");
                goto out_free_geos;
        }

        iwl3945_set_rxon_channel(priv, IEEE80211_BAND_2GHZ, 6);
        iwl3945_setup_deferred_work(priv);
        iwl3945_setup_rx_handlers(priv);

        /***********************
         * 9. Conclude
         * ********************/
        pci_save_state(pdev);
        pci_disable_device(pdev);

        /*********************************
         * 10. Setup and Register mac80211
         * *******************************/

        err = ieee80211_register_hw(priv->hw);
        if (err) {
                IWL_ERROR("Failed to register network device (error %d)\n", err);
                goto  out_remove_sysfs;
        }

        priv->hw->conf.beacon_int = 100;
        priv->mac80211_registered = 1;


        err = iwl3945_rfkill_init(priv);
        if (err)
                IWL_ERROR("Unable to initialize RFKILL system. "
                                  "Ignoring error: %d\n", err);

        return 0;

 out_remove_sysfs:
        sysfs_remove_group(&pdev->dev.kobj, &iwl3945_attribute_group);
 out_free_geos:
        iwl3945_free_geos(priv);
 out_free_channel_map:
        iwl3945_free_channel_map(priv);


 out_release_irq:
        destroy_workqueue(priv->workqueue);
        priv->workqueue = NULL;
        iwl3945_unset_hw_setting(priv);

 out_iounmap:
        pci_iounmap(pdev, priv->hw_base);
 out_pci_release_regions:
        pci_release_regions(pdev);
 out_pci_disable_device:
        pci_disable_device(pdev);
        pci_set_drvdata(pdev, NULL);
 out_ieee80211_free_hw:
        ieee80211_free_hw(priv->hw);
 out:
        return err;
}

static void __devexit iwl3945_pci_remove(struct pci_dev *pdev)
{
        struct iwl3945_priv *priv = pci_get_drvdata(pdev);
        unsigned long flags;

        if (!priv)
                return;

        IWL_DEBUG_INFO("*** UNLOAD DRIVER ***\n");

        set_bit(STATUS_EXIT_PENDING, &priv->status);

        iwl3945_down(priv);

        /* make sure we flush any pending irq or
         * tasklet for the driver
         */
        spin_lock_irqsave(&priv->lock, flags);
        iwl3945_disable_interrupts(priv);
        spin_unlock_irqrestore(&priv->lock, flags);

        iwl_synchronize_irq(priv);

        sysfs_remove_group(&pdev->dev.kobj, &iwl3945_attribute_group);

        iwl3945_rfkill_unregister(priv);
        iwl3945_dealloc_ucode_pci(priv);

        if (priv->rxq.bd)
                iwl3945_rx_queue_free(priv, &priv->rxq);
        iwl3945_hw_txq_ctx_free(priv);

        iwl3945_unset_hw_setting(priv);
        iwl3945_clear_stations_table(priv);

        if (priv->mac80211_registered)
                ieee80211_unregister_hw(priv->hw);

        /*netif_stop_queue(dev); */
        flush_workqueue(priv->workqueue);

        /* ieee80211_unregister_hw calls iwl3945_mac_stop, which flushes
         * priv->workqueue... so we can't take down the workqueue
         * until now... */
        destroy_workqueue(priv->workqueue);
        priv->workqueue = NULL;

        pci_iounmap(pdev, priv->hw_base);
        pci_release_regions(pdev);
        pci_disable_device(pdev);
        pci_set_drvdata(pdev, NULL);

        iwl3945_free_channel_map(priv);
        iwl3945_free_geos(priv);
        kfree(priv->scan);
        if (priv->ibss_beacon)
                dev_kfree_skb(priv->ibss_beacon);

        ieee80211_free_hw(priv->hw);
}

#ifdef CONFIG_PM

static int iwl3945_pci_suspend(struct pci_dev *pdev, pm_message_t state)
{
        struct iwl3945_priv *priv = pci_get_drvdata(pdev);

        if (priv->is_open) {
                set_bit(STATUS_IN_SUSPEND, &priv->status);
                iwl3945_mac_stop(priv->hw);
                priv->is_open = 1;
        }

        pci_set_power_state(pdev, PCI_D3hot);

        return 0;
}

static int iwl3945_pci_resume(struct pci_dev *pdev)
{
        struct iwl3945_priv *priv = pci_get_drvdata(pdev);

        pci_set_power_state(pdev, PCI_D0);

        if (priv->is_open)
                iwl3945_mac_start(priv->hw);

        clear_bit(STATUS_IN_SUSPEND, &priv->status);
        return 0;
}

#endif /* CONFIG_PM */

/*************** RFKILL FUNCTIONS **********/
#ifdef CONFIG_IWL3945_RFKILL
/* software rf-kill from user */
static int iwl3945_rfkill_soft_rf_kill(void *data, enum rfkill_state state)
{
        struct iwl3945_priv *priv = data;
        int err = 0;

        if (!priv->rfkill)
        return 0;

        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                return 0;

        IWL_DEBUG_RF_KILL("we received soft RFKILL set to state %d\n", state);
        mutex_lock(&priv->mutex);

        switch (state) {
        case RFKILL_STATE_UNBLOCKED:
                if (iwl3945_is_rfkill_hw(priv)) {
                        err = -EBUSY;
                        goto out_unlock;
                }
                iwl3945_radio_kill_sw(priv, 0);
                break;
        case RFKILL_STATE_SOFT_BLOCKED:
                iwl3945_radio_kill_sw(priv, 1);
                break;
        default:
                IWL_WARNING("we received unexpected RFKILL state %d\n", state);
                break;
        }
out_unlock:
        mutex_unlock(&priv->mutex);

        return err;
}

int iwl3945_rfkill_init(struct iwl3945_priv *priv)
{
        struct device *device = wiphy_dev(priv->hw->wiphy);
        int ret = 0;

        BUG_ON(device == NULL);

        IWL_DEBUG_RF_KILL("Initializing RFKILL.\n");
        priv->rfkill = rfkill_allocate(device, RFKILL_TYPE_WLAN);
        if (!priv->rfkill) {
                IWL_ERROR("Unable to allocate rfkill device.\n");
                ret = -ENOMEM;
                goto error;
        }

        priv->rfkill->name = priv->cfg->name;
        priv->rfkill->data = priv;
        priv->rfkill->state = RFKILL_STATE_UNBLOCKED;
        priv->rfkill->toggle_radio = iwl3945_rfkill_soft_rf_kill;
        priv->rfkill->user_claim_unsupported = 1;

        priv->rfkill->dev.class->suspend = NULL;
        priv->rfkill->dev.class->resume = NULL;

        ret = rfkill_register(priv->rfkill);
        if (ret) {
                IWL_ERROR("Unable to register rfkill: %d\n", ret);
                goto freed_rfkill;
        }

        IWL_DEBUG_RF_KILL("RFKILL initialization complete.\n");
        return ret;

freed_rfkill:
        if (priv->rfkill != NULL)
                rfkill_free(priv->rfkill);
        priv->rfkill = NULL;

error:
        IWL_DEBUG_RF_KILL("RFKILL initialization complete.\n");
        return ret;
}

void iwl3945_rfkill_unregister(struct iwl3945_priv *priv)
{
        if (priv->rfkill)
                rfkill_unregister(priv->rfkill);

        priv->rfkill = NULL;
}

/* set rf-kill to the right state. */
void iwl3945_rfkill_set_hw_state(struct iwl3945_priv *priv)
{

        if (!priv->rfkill)
                return;

        if (iwl3945_is_rfkill_hw(priv)) {
                rfkill_force_state(priv->rfkill, RFKILL_STATE_HARD_BLOCKED);
                return;
        }

        if (!iwl3945_is_rfkill_sw(priv))
                rfkill_force_state(priv->rfkill, RFKILL_STATE_UNBLOCKED);
        else
                rfkill_force_state(priv->rfkill, RFKILL_STATE_SOFT_BLOCKED);
}
#endif

/*****************************************************************************
 *
 * driver and module entry point
 *
 *****************************************************************************/

static struct pci_driver iwl3945_driver = {
        .name = DRV_NAME,
        .id_table = iwl3945_hw_card_ids,
        .probe = iwl3945_pci_probe,
        .remove = __devexit_p(iwl3945_pci_remove),
#ifdef CONFIG_PM
        .suspend = iwl3945_pci_suspend,
        .resume = iwl3945_pci_resume,
#endif
};

static int __init iwl3945_init(void)
{

        int ret;
        printk(KERN_INFO DRV_NAME ": " DRV_DESCRIPTION ", " DRV_VERSION "\n");
        printk(KERN_INFO DRV_NAME ": " DRV_COPYRIGHT "\n");

        ret = iwl3945_rate_control_register();
        if (ret) {
                IWL_ERROR("Unable to register rate control algorithm: %d\n", ret);
                return ret;
        }

        ret = pci_register_driver(&iwl3945_driver);
        if (ret) {
                IWL_ERROR("Unable to initialize PCI module\n");
                goto error_register;
        }
#ifdef CONFIG_IWL3945_DEBUG
        ret = driver_create_file(&iwl3945_driver.driver, &driver_attr_debug_level);
        if (ret) {
                IWL_ERROR("Unable to create driver sysfs file\n");
                goto error_debug;
        }
#endif

        return ret;

#ifdef CONFIG_IWL3945_DEBUG
error_debug:
        pci_unregister_driver(&iwl3945_driver);
#endif
error_register:
        iwl3945_rate_control_unregister();
        return ret;
}

static void __exit iwl3945_exit(void)
{
#ifdef CONFIG_IWL3945_DEBUG
        driver_remove_file(&iwl3945_driver.driver, &driver_attr_debug_level);
#endif
        pci_unregister_driver(&iwl3945_driver);
        iwl3945_rate_control_unregister();
}

MODULE_FIRMWARE("iwlwifi-3945" IWL3945_UCODE_API ".ucode");

module_param_named(antenna, iwl3945_param_antenna, int, 0444);
MODULE_PARM_DESC(antenna, "select antenna (1=Main, 2=Aux, default 0 [both])");
module_param_named(disable, iwl3945_param_disable, int, 0444);
MODULE_PARM_DESC(disable, "manually disable the radio (default 0 [radio on])");
module_param_named(hwcrypto, iwl3945_param_hwcrypto, int, 0444);
MODULE_PARM_DESC(hwcrypto,
                 "using hardware crypto engine (default 0 [software])\n");
module_param_named(debug, iwl3945_param_debug, int, 0444);
MODULE_PARM_DESC(debug, "debug output mask");
module_param_named(disable_hw_scan, iwl3945_param_disable_hw_scan, int, 0444);
MODULE_PARM_DESC(disable_hw_scan, "disable hardware scanning (default 0)");

module_param_named(queues_num, iwl3945_param_queues_num, int, 0444);
MODULE_PARM_DESC(queues_num, "number of hw queues.");

/* QoS */
module_param_named(qos_enable, iwl3945_param_qos_enable, int, 0444);
MODULE_PARM_DESC(qos_enable, "enable all QoS functionality");

module_exit(iwl3945_exit);
module_init(iwl3945_init);