drivers/net/wireless/iwlwifi/iwl-hcmd.c

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 - 2010 Intel Corporation. All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  19  * USA
  20  *
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *****************************************************************************/
  28
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/sched.h>
  32 #include <net/mac80211.h>
  33
  34 #include "iwl-dev.h" /* FIXME: remove */
  35 #include "iwl-debug.h"
  36 #include "iwl-eeprom.h"
  37 #include "iwl-core.h"
  38
  39
  40 const char *get_cmd_string(u8 cmd)
  41 {
  42         switch (cmd) {
  43                 IWL_CMD(REPLY_ALIVE);
  44                 IWL_CMD(REPLY_ERROR);
  45                 IWL_CMD(REPLY_RXON);
  46                 IWL_CMD(REPLY_RXON_ASSOC);
  47                 IWL_CMD(REPLY_QOS_PARAM);
  48                 IWL_CMD(REPLY_RXON_TIMING);
  49                 IWL_CMD(REPLY_ADD_STA);
  50                 IWL_CMD(REPLY_REMOVE_STA);
  51                 IWL_CMD(REPLY_REMOVE_ALL_STA);
  52                 IWL_CMD(REPLY_TXFIFO_FLUSH);
  53                 IWL_CMD(REPLY_WEPKEY);
  54                 IWL_CMD(REPLY_3945_RX);
  55                 IWL_CMD(REPLY_TX);
  56                 IWL_CMD(REPLY_RATE_SCALE);
  57                 IWL_CMD(REPLY_LEDS_CMD);
  58                 IWL_CMD(REPLY_TX_LINK_QUALITY_CMD);
  59                 IWL_CMD(COEX_PRIORITY_TABLE_CMD);
  60                 IWL_CMD(COEX_MEDIUM_NOTIFICATION);
  61                 IWL_CMD(COEX_EVENT_CMD);
  62                 IWL_CMD(REPLY_QUIET_CMD);
  63                 IWL_CMD(REPLY_CHANNEL_SWITCH);
  64                 IWL_CMD(CHANNEL_SWITCH_NOTIFICATION);
  65                 IWL_CMD(REPLY_SPECTRUM_MEASUREMENT_CMD);
  66                 IWL_CMD(SPECTRUM_MEASURE_NOTIFICATION);
  67                 IWL_CMD(POWER_TABLE_CMD);
  68                 IWL_CMD(PM_SLEEP_NOTIFICATION);
  69                 IWL_CMD(PM_DEBUG_STATISTIC_NOTIFIC);
  70                 IWL_CMD(REPLY_SCAN_CMD);
  71                 IWL_CMD(REPLY_SCAN_ABORT_CMD);
  72                 IWL_CMD(SCAN_START_NOTIFICATION);
  73                 IWL_CMD(SCAN_RESULTS_NOTIFICATION);
  74                 IWL_CMD(SCAN_COMPLETE_NOTIFICATION);
  75                 IWL_CMD(BEACON_NOTIFICATION);
  76                 IWL_CMD(REPLY_TX_BEACON);
  77                 IWL_CMD(WHO_IS_AWAKE_NOTIFICATION);
  78                 IWL_CMD(QUIET_NOTIFICATION);
  79                 IWL_CMD(REPLY_TX_PWR_TABLE_CMD);
  80                 IWL_CMD(MEASURE_ABORT_NOTIFICATION);
  81                 IWL_CMD(REPLY_BT_CONFIG);
  82                 IWL_CMD(REPLY_STATISTICS_CMD);
  83                 IWL_CMD(STATISTICS_NOTIFICATION);
  84                 IWL_CMD(REPLY_CARD_STATE_CMD);
  85                 IWL_CMD(CARD_STATE_NOTIFICATION);
  86                 IWL_CMD(MISSED_BEACONS_NOTIFICATION);
  87                 IWL_CMD(REPLY_CT_KILL_CONFIG_CMD);
  88                 IWL_CMD(SENSITIVITY_CMD);
  89                 IWL_CMD(REPLY_PHY_CALIBRATION_CMD);
  90                 IWL_CMD(REPLY_RX_PHY_CMD);
  91                 IWL_CMD(REPLY_RX_MPDU_CMD);
  92                 IWL_CMD(REPLY_RX);
  93                 IWL_CMD(REPLY_COMPRESSED_BA);
  94                 IWL_CMD(CALIBRATION_CFG_CMD);
  95                 IWL_CMD(CALIBRATION_RES_NOTIFICATION);
  96                 IWL_CMD(CALIBRATION_COMPLETE_NOTIFICATION);
  97                 IWL_CMD(REPLY_TX_POWER_DBM_CMD);
  98                 IWL_CMD(TEMPERATURE_NOTIFICATION);
  99                 IWL_CMD(TX_ANT_CONFIGURATION_CMD);
 100         default:
 101                 return "UNKNOWN";
 102
 103         }
 104 }
 105 EXPORT_SYMBOL(get_cmd_string);
 106
 107 #define HOST_COMPLETE_TIMEOUT (HZ / 2)
 108
 109 static void iwl_generic_cmd_callback(struct iwl_priv *priv,
 110                                      struct iwl_device_cmd *cmd,
 111                                      struct iwl_rx_packet *pkt)
 112 {
 113         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 114                 IWL_ERR(priv, "Bad return from %s (0x%08X)\n",
 115                         get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 116                 return;
 117         }
 118
 119 #ifdef CONFIG_IWLWIFI_DEBUG
 120         switch (cmd->hdr.cmd) {
 121         case REPLY_TX_LINK_QUALITY_CMD:
 122         case SENSITIVITY_CMD:
 123                 IWL_DEBUG_HC_DUMP(priv, "back from %s (0x%08X)\n",
 124                                 get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 125                 break;
 126         default:
 127                 IWL_DEBUG_HC(priv, "back from %s (0x%08X)\n",
 128                                 get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 129         }
 130 #endif
 131 }
 132
 133 static int iwl_send_cmd_async(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 134 {
 135         int ret;
 136
 137         BUG_ON(!(cmd->flags & CMD_ASYNC));
 138
 139         /* An asynchronous command can not expect an SKB to be set. */
 140         BUG_ON(cmd->flags & CMD_WANT_SKB);
 141
 142         /* Assign a generic callback if one is not provided */
 143         if (!cmd->callback)
 144                 cmd->callback = iwl_generic_cmd_callback;
 145
 146         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 147                 return -EBUSY;
 148
 149         ret = iwl_enqueue_hcmd(priv, cmd);
 150         if (ret < 0) {
 151                 IWL_ERR(priv, "Error sending %s: enqueue_hcmd failed: %d\n",
 152                           get_cmd_string(cmd->id), ret);
 153                 return ret;
 154         }
 155         return 0;
 156 }
 157
 158 int iwl_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 159 {
 160         int cmd_idx;
 161         int ret;
 162
 163         BUG_ON(cmd->flags & CMD_ASYNC);
 164
 165          /* A synchronous command can not have a callback set. */
 166         BUG_ON(cmd->callback);
 167
 168         IWL_DEBUG_INFO(priv, "Attempting to send sync command %s\n",
 169                         get_cmd_string(cmd->id));
 170         mutex_lock(&priv->sync_cmd_mutex);
 171
 172         set_bit(STATUS_HCMD_ACTIVE, &priv->status);
 173         IWL_DEBUG_INFO(priv, "Setting HCMD_ACTIVE for command %s\n",
 174                         get_cmd_string(cmd->id));
 175
 176         cmd_idx = iwl_enqueue_hcmd(priv, cmd);
 177         if (cmd_idx < 0) {
 178                 ret = cmd_idx;
 179                 IWL_ERR(priv, "Error sending %s: enqueue_hcmd failed: %d\n",
 180                           get_cmd_string(cmd->id), ret);
 181                 goto out;
 182         }
 183
 184         ret = wait_event_interruptible_timeout(priv->wait_command_queue,
 185                         !test_bit(STATUS_HCMD_ACTIVE, &priv->status),
 186                         HOST_COMPLETE_TIMEOUT);
 187         if (!ret) {
 188                 if (test_bit(STATUS_HCMD_ACTIVE, &priv->status)) {
 189                         IWL_ERR(priv,
 190                                 "Error sending %s: time out after %dms.\n",
 191                                 get_cmd_string(cmd->id),
 192                                 jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
 193
 194                         clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 195                         IWL_DEBUG_INFO(priv, "Clearing HCMD_ACTIVE for command %s\n",
 196                                        get_cmd_string(cmd->id));
 197                         ret = -ETIMEDOUT;
 198                         goto cancel;
 199                 }
 200         }
 201
 202         if (test_bit(STATUS_RF_KILL_HW, &priv->status)) {
 203                 IWL_ERR(priv, "Command %s aborted: RF KILL Switch\n",
 204                                get_cmd_string(cmd->id));
 205                 ret = -ECANCELED;
 206                 goto fail;
 207         }
 208         if (test_bit(STATUS_FW_ERROR, &priv->status)) {
 209                 IWL_ERR(priv, "Command %s failed: FW Error\n",
 210                                get_cmd_string(cmd->id));
 211                 ret = -EIO;
 212                 goto fail;
 213         }
 214         if ((cmd->flags & CMD_WANT_SKB) && !cmd->reply_page) {
 215                 IWL_ERR(priv, "Error: Response NULL in '%s'\n",
 216                           get_cmd_string(cmd->id));
 217                 ret = -EIO;
 218                 goto cancel;
 219         }
 220
 221         ret = 0;
 222         goto out;
 223
 224 cancel:
 225         if (cmd->flags & CMD_WANT_SKB) {
 226                 /*
 227                  * Cancel the CMD_WANT_SKB flag for the cmd in the
 228                  * TX cmd queue. Otherwise in case the cmd comes
 229                  * in later, it will possibly set an invalid
 230                  * address (cmd->meta.source).
 231                  */
 232                 priv->txq[IWL_CMD_QUEUE_NUM].meta[cmd_idx].flags &=
 233                                                         ~CMD_WANT_SKB;
 234         }
 235 fail:
 236         if (cmd->reply_page) {
 237                 iwl_free_pages(priv, cmd->reply_page);
 238                 cmd->reply_page = 0;
 239         }
 240 out:
 241         mutex_unlock(&priv->sync_cmd_mutex);
 242         return ret;
 243 }
 244 EXPORT_SYMBOL(iwl_send_cmd_sync);
 245
 246 int iwl_send_cmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 247 {
 248         if (cmd->flags & CMD_ASYNC)
 249                 return iwl_send_cmd_async(priv, cmd);
 250
 251         return iwl_send_cmd_sync(priv, cmd);
 252 }
 253 EXPORT_SYMBOL(iwl_send_cmd);
 254
 255 int iwl_send_cmd_pdu(struct iwl_priv *priv, u8 id, u16 len, const void *data)
 256 {
 257         struct iwl_host_cmd cmd = {
 258                 .id = id,
 259                 .len = len,
 260                 .data = data,
 261         };
 262
 263         return iwl_send_cmd_sync(priv, &cmd);
 264 }
 265 EXPORT_SYMBOL(iwl_send_cmd_pdu);
 266
 267 int iwl_send_cmd_pdu_async(struct iwl_priv *priv,
 268                            u8 id, u16 len, const void *data,
 269                            void (*callback)(struct iwl_priv *priv,
 270                                             struct iwl_device_cmd *cmd,
 271                                             struct iwl_rx_packet *pkt))
 272 {
 273         struct iwl_host_cmd cmd = {
 274                 .id = id,
 275                 .len = len,
 276                 .data = data,
 277         };
 278
 279         cmd.flags |= CMD_ASYNC;
 280         cmd.callback = callback;
 281
 282         return iwl_send_cmd_async(priv, &cmd);
 283 }
 284 EXPORT_SYMBOL(iwl_send_cmd_pdu_async);