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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2009 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  *  Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26
  27
  28 #include <linux/kernel.h>
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31 #include <linux/pci.h>
  32 #include <linux/dma-mapping.h>
  33 #include <linux/delay.h>
  34 #include <linux/skbuff.h>
  35 #include <linux/netdevice.h>
  36 #include <linux/wireless.h>
  37 #include <net/mac80211.h>
  38 #include <linux/etherdevice.h>
  39 #include <asm/unaligned.h>
  40
  41 #include "iwl-dev.h"
  42 #include "iwl-core.h"
  43 #include "iwl-io.h"
  44
  45 /* default: IWL_LED_BLINK(0) using blinking index table */
  46 static int led_mode;
  47 module_param(led_mode, int, S_IRUGO);
  48 MODULE_PARM_DESC(led_mode, "led mode: 0=blinking, 1=On(RF On)/Off(RF Off), "
  49                            "(default 0)\n");
  50
  51
  52 static const struct {
  53         u16 tpt;        /* Mb/s */
  54         u8 on_time;
  55         u8 off_time;
  56 } blink_tbl[] =
  57 {
  58         {300, 25, 25},
  59         {200, 40, 40},
  60         {100, 55, 55},
  61         {70, 65, 65},
  62         {50, 75, 75},
  63         {20, 85, 85},
  64         {10, 95, 95},
  65         {5, 110, 110},
  66         {1, 130, 130},
  67         {0, 167, 167},
  68         /* SOLID_ON */
  69         {-1, IWL_LED_SOLID, 0}
  70 };
  71
  72 #define IWL_1MB_RATE (128 * 1024)
  73 #define IWL_LED_THRESHOLD (16)
  74 #define IWL_MAX_BLINK_TBL (ARRAY_SIZE(blink_tbl) - 1) /* exclude SOLID_ON */
  75 #define IWL_SOLID_BLINK_IDX (ARRAY_SIZE(blink_tbl) - 1)
  76
  77 /*
  78  * Adjust led blink rate to compensate on a MAC Clock difference on every HW
  79  * Led blink rate analysis showed an average deviation of 0% on 3945,
  80  * 5% on 4965 HW and 20% on 5000 series and up.
  81  * Need to compensate on the led on/off time per HW according to the deviation
  82  * to achieve the desired led frequency
  83  * The calculation is: (100-averageDeviation)/100 * blinkTime
  84  * For code efficiency the calculation will be:
  85  *     compensation = (100 - averageDeviation) * 64 / 100
  86  *     NewBlinkTime = (compensation * BlinkTime) / 64
  87  */
  88 static inline u8 iwl_blink_compensation(struct iwl_priv *priv,
  89                                     u8 time, u16 compensation)
  90 {
  91         if (!compensation) {
  92                 IWL_ERR(priv, "undefined blink compensation: "
  93                         "use pre-defined blinking time\n");
  94                 return time;
  95         }
  96
  97         return (u8)((time * compensation) >> 6);
  98 }
  99
 100 /* Set led pattern command */
 101 static int iwl_led_pattern(struct iwl_priv *priv, unsigned int idx)
 102 {
 103         struct iwl_led_cmd led_cmd = {
 104                 .id = IWL_LED_LINK,
 105                 .interval = IWL_DEF_LED_INTRVL
 106         };
 107
 108         BUG_ON(idx > IWL_MAX_BLINK_TBL);
 109
 110         IWL_DEBUG_LED(priv, "Led blink time compensation= %u\n",
 111                         priv->cfg->led_compensation);
 112         led_cmd.on =
 113                 iwl_blink_compensation(priv, blink_tbl[idx].on_time,
 114                                         priv->cfg->led_compensation);
 115         led_cmd.off =
 116                 iwl_blink_compensation(priv, blink_tbl[idx].off_time,
 117                                         priv->cfg->led_compensation);
 118
 119         return priv->cfg->ops->led->cmd(priv, &led_cmd);
 120 }
 121
 122 int iwl_led_start(struct iwl_priv *priv)
 123 {
 124         return priv->cfg->ops->led->on(priv);
 125 }
 126 EXPORT_SYMBOL(iwl_led_start);
 127
 128 int iwl_led_associate(struct iwl_priv *priv)
 129 {
 130         IWL_DEBUG_LED(priv, "Associated\n");
 131         if (led_mode == IWL_LED_BLINK)
 132                 priv->allow_blinking = 1;
 133         priv->last_blink_time = jiffies;
 134
 135         return 0;
 136 }
 137
 138 int iwl_led_disassociate(struct iwl_priv *priv)
 139 {
 140         priv->allow_blinking = 0;
 141
 142         return 0;
 143 }
 144
 145 /*
 146  * calculate blink rate according to last second Tx/Rx activities
 147  */
 148 static int iwl_get_blink_rate(struct iwl_priv *priv)
 149 {
 150         int i;
 151         /* count both tx and rx traffic to be able to
 152          * handle traffic in either direction
 153          */
 154         u64 current_tpt = priv->tx_stats.data_bytes +
 155                           priv->rx_stats.data_bytes;
 156         s64 tpt = current_tpt - priv->led_tpt;
 157
 158         if (tpt < 0) /* wraparound */
 159                 tpt = -tpt;
 160
 161         IWL_DEBUG_LED(priv, "tpt %lld current_tpt %llu\n",
 162                 (long long)tpt,
 163                 (unsigned long long)current_tpt);
 164         priv->led_tpt = current_tpt;
 165
 166         if (!priv->allow_blinking)
 167                 i = IWL_MAX_BLINK_TBL;
 168         else
 169                 for (i = 0; i < IWL_MAX_BLINK_TBL; i++)
 170                         if (tpt > (blink_tbl[i].tpt * IWL_1MB_RATE))
 171                                 break;
 172
 173         IWL_DEBUG_LED(priv, "LED BLINK IDX=%d\n", i);
 174         return i;
 175 }
 176
 177 /*
 178  * this function called from handler. Since setting Led command can
 179  * happen very frequent we postpone led command to be called from
 180  * REPLY handler so we know ucode is up
 181  */
 182 void iwl_leds_background(struct iwl_priv *priv)
 183 {
 184         u8 blink_idx;
 185
 186         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 187                 priv->last_blink_time = 0;
 188                 return;
 189         }
 190         if (iwl_is_rfkill(priv)) {
 191                 priv->last_blink_time = 0;
 192                 return;
 193         }
 194
 195         if (!priv->allow_blinking) {
 196                 priv->last_blink_time = 0;
 197                 if (priv->last_blink_rate != IWL_SOLID_BLINK_IDX) {
 198                         priv->last_blink_rate = IWL_SOLID_BLINK_IDX;
 199                         iwl_led_pattern(priv, IWL_SOLID_BLINK_IDX);
 200                 }
 201                 return;
 202         }
 203         if (!priv->last_blink_time ||
 204             !time_after(jiffies, priv->last_blink_time +
 205                         msecs_to_jiffies(1000)))
 206                 return;
 207
 208         blink_idx = iwl_get_blink_rate(priv);
 209
 210         /* call only if blink rate change */
 211         if (blink_idx != priv->last_blink_rate)
 212                 iwl_led_pattern(priv, blink_idx);
 213
 214         priv->last_blink_time = jiffies;
 215         priv->last_blink_rate = blink_idx;
 216 }
 217 EXPORT_SYMBOL(iwl_leds_background);
 218
 219 void iwl_leds_init(struct iwl_priv *priv)
 220 {
 221         priv->last_blink_rate = 0;
 222         priv->last_blink_time = 0;
 223         priv->allow_blinking = 0;
 224 }
 225 EXPORT_SYMBOL(iwl_leds_init);