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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2011 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/delay.h>
  32 #include <linux/skbuff.h>
  33 #include <linux/netdevice.h>
  34 #include <linux/wireless.h>
  35 #include <net/mac80211.h>
  36 #include <linux/etherdevice.h>
  37 #include <asm/unaligned.h>
  38
  39 #include "iwl-dev.h"
  40 #include "iwl-core.h"
  41 #include "iwl-agn.h"
  42 #include "iwl-io.h"
  43 #include "iwl-trans.h"
  44
  45 /* Throughput           OFF time(ms)    ON time (ms)
  46  *      >300                    25              25
  47  *      >200 to 300             40              40
  48  *      >100 to 200             55              55
  49  *      >70 to 100              65              65
  50  *      >50 to 70               75              75
  51  *      >20 to 50               85              85
  52  *      >10 to 20               95              95
  53  *      >5 to 10                110             110
  54  *      >1 to 5                 130             130
  55  *      >0 to 1                 167             167
  56  *      <=0                                     SOLID ON
  57  */
  58 static const struct ieee80211_tpt_blink iwl_blink[] = {
  59         { .throughput = 0, .blink_time = 334 },
  60         { .throughput = 1 * 1024 - 1, .blink_time = 260 },
  61         { .throughput = 5 * 1024 - 1, .blink_time = 220 },
  62         { .throughput = 10 * 1024 - 1, .blink_time = 190 },
  63         { .throughput = 20 * 1024 - 1, .blink_time = 170 },
  64         { .throughput = 50 * 1024 - 1, .blink_time = 150 },
  65         { .throughput = 70 * 1024 - 1, .blink_time = 130 },
  66         { .throughput = 100 * 1024 - 1, .blink_time = 110 },
  67         { .throughput = 200 * 1024 - 1, .blink_time = 80 },
  68         { .throughput = 300 * 1024 - 1, .blink_time = 50 },
  69 };
  70
  71 /* Set led register off */
  72 void iwlagn_led_enable(struct iwl_priv *priv)
  73 {
  74         iwl_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_ON);
  75 }
  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 20% on 5000 series
  80  * 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 static int iwl_send_led_cmd(struct iwl_priv *priv, struct iwl_led_cmd *led_cmd)
 101 {
 102         struct iwl_host_cmd cmd = {
 103                 .id = REPLY_LEDS_CMD,
 104                 .len = { sizeof(struct iwl_led_cmd), },
 105                 .data = { led_cmd, },
 106                 .flags = CMD_ASYNC,
 107                 .callback = NULL,
 108         };
 109         u32 reg;
 110
 111         reg = iwl_read32(priv, CSR_LED_REG);
 112         if (reg != (reg & CSR_LED_BSM_CTRL_MSK))
 113                 iwl_write32(priv, CSR_LED_REG, reg & CSR_LED_BSM_CTRL_MSK);
 114
 115         return trans_send_cmd(&priv->trans, &cmd);
 116 }
 117
 118 /* Set led pattern command */
 119 static int iwl_led_cmd(struct iwl_priv *priv,
 120                        unsigned long on,
 121                        unsigned long off)
 122 {
 123         struct iwl_led_cmd led_cmd = {
 124                 .id = IWL_LED_LINK,
 125                 .interval = IWL_DEF_LED_INTRVL
 126         };
 127         int ret;
 128
 129         if (!test_bit(STATUS_READY, &priv->status))
 130                 return -EBUSY;
 131
 132         if (priv->blink_on == on && priv->blink_off == off)
 133                 return 0;
 134
 135         if (off == 0) {
 136                 /* led is SOLID_ON */
 137                 on = IWL_LED_SOLID;
 138         }
 139
 140         IWL_DEBUG_LED(priv, "Led blink time compensation=%u\n",
 141                         priv->cfg->base_params->led_compensation);
 142         led_cmd.on = iwl_blink_compensation(priv, on,
 143                                 priv->cfg->base_params->led_compensation);
 144         led_cmd.off = iwl_blink_compensation(priv, off,
 145                                 priv->cfg->base_params->led_compensation);
 146
 147         ret = iwl_send_led_cmd(priv, &led_cmd);
 148         if (!ret) {
 149                 priv->blink_on = on;
 150                 priv->blink_off = off;
 151         }
 152         return ret;
 153 }
 154
 155 static void iwl_led_brightness_set(struct led_classdev *led_cdev,
 156                                    enum led_brightness brightness)
 157 {
 158         struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
 159         unsigned long on = 0;
 160
 161         if (brightness > 0)
 162                 on = IWL_LED_SOLID;
 163
 164         iwl_led_cmd(priv, on, 0);
 165 }
 166
 167 static int iwl_led_blink_set(struct led_classdev *led_cdev,
 168                              unsigned long *delay_on,
 169                              unsigned long *delay_off)
 170 {
 171         struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
 172
 173         return iwl_led_cmd(priv, *delay_on, *delay_off);
 174 }
 175
 176 void iwl_leds_init(struct iwl_priv *priv)
 177 {
 178         int mode = iwlagn_mod_params.led_mode;
 179         int ret;
 180
 181         if (mode == IWL_LED_DEFAULT)
 182                 mode = priv->cfg->led_mode;
 183
 184         priv->led.name = kasprintf(GFP_KERNEL, "%s-led",
 185                                    wiphy_name(priv->hw->wiphy));
 186         priv->led.brightness_set = iwl_led_brightness_set;
 187         priv->led.blink_set = iwl_led_blink_set;
 188         priv->led.max_brightness = 1;
 189
 190         switch (mode) {
 191         case IWL_LED_DEFAULT:
 192                 WARN_ON(1);
 193                 break;
 194         case IWL_LED_BLINK:
 195                 priv->led.default_trigger =
 196                         ieee80211_create_tpt_led_trigger(priv->hw,
 197                                         IEEE80211_TPT_LEDTRIG_FL_CONNECTED,
 198                                         iwl_blink, ARRAY_SIZE(iwl_blink));
 199                 break;
 200         case IWL_LED_RF_STATE:
 201                 priv->led.default_trigger =
 202                         ieee80211_get_radio_led_name(priv->hw);
 203                 break;
 204         }
 205
 206         ret = led_classdev_register(priv->bus->dev,
 207                                     &priv->led);
 208         if (ret) {
 209                 kfree(priv->led.name);
 210                 return;
 211         }
 212
 213         priv->led_registered = true;
 214 }
 215
 216 void iwl_leds_exit(struct iwl_priv *priv)
 217 {
 218         if (!priv->led_registered)
 219                 return;
 220
 221         led_classdev_unregister(&priv->led);
 222         kfree(priv->led.name);
 223 }