drivers/net/wireless/iwlegacy/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/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 <net/mac80211.h>
  37 #include <linux/etherdevice.h>
  38 #include <asm/unaligned.h>
  39
  40 #include "iwl-dev.h"
  41 #include "iwl-core.h"
  42 #include "iwl-io.h"
  43
  44 /* default: IWL_LED_BLINK(0) using blinking index table */
  45 static int led_mode;
  46 module_param(led_mode, int, S_IRUGO);
  47 MODULE_PARM_DESC(led_mode, "0=system default, "
  48                 "1=On(RF On)/Off(RF Off), 2=blinking");
  49
  50 /* Throughput           OFF time(ms)    ON time (ms)
  51  *      >300                    25              25
  52  *      >200 to 300             40              40
  53  *      >100 to 200             55              55
  54  *      >70 to 100              65              65
  55  *      >50 to 70               75              75
  56  *      >20 to 50               85              85
  57  *      >10 to 20               95              95
  58  *      >5 to 10                110             110
  59  *      >1 to 5                 130             130
  60  *      >0 to 1                 167             167
  61  *      <=0                                     SOLID ON
  62  */
  63 static const struct ieee80211_tpt_blink iwl_blink[] = {
  64         { .throughput = 0, .blink_time = 334 },
  65         { .throughput = 1 * 1024 - 1, .blink_time = 260 },
  66         { .throughput = 5 * 1024 - 1, .blink_time = 220 },
  67         { .throughput = 10 * 1024 - 1, .blink_time = 190 },
  68         { .throughput = 20 * 1024 - 1, .blink_time = 170 },
  69         { .throughput = 50 * 1024 - 1, .blink_time = 150 },
  70         { .throughput = 70 * 1024 - 1, .blink_time = 130 },
  71         { .throughput = 100 * 1024 - 1, .blink_time = 110 },
  72         { .throughput = 200 * 1024 - 1, .blink_time = 80 },
  73         { .throughput = 300 * 1024 - 1, .blink_time = 50 },
  74 };
  75
  76 /*
  77  * Adjust led blink rate to compensate on a MAC Clock difference on every HW
  78  * Led blink rate analysis showed an average deviation of 0% on 3945,
  79  * 5% on 4965 HW.
  80  * Need to compensate on the led on/off time per HW according to the deviation
  81  * to achieve the desired led frequency
  82  * The calculation is: (100-averageDeviation)/100 * blinkTime
  83  * For code efficiency the calculation will be:
  84  *     compensation = (100 - averageDeviation) * 64 / 100
  85  *     NewBlinkTime = (compensation * BlinkTime) / 64
  86  */
  87 static inline u8 iwl_legacy_blink_compensation(struct iwl_priv *priv,
  88                                     u8 time, u16 compensation)
  89 {
  90         if (!compensation) {
  91                 IWL_ERR(priv, "undefined blink compensation: "
  92                         "use pre-defined blinking time\n");
  93                 return time;
  94         }
  95
  96         return (u8)((time * compensation) >> 6);
  97 }
  98
  99 /* Set led pattern command */
 100 static int iwl_legacy_led_cmd(struct iwl_priv *priv,
 101                        unsigned long on,
 102                        unsigned long off)
 103 {
 104         struct iwl_led_cmd led_cmd = {
 105                 .id = IWL_LED_LINK,
 106                 .interval = IWL_DEF_LED_INTRVL
 107         };
 108         int ret;
 109
 110         if (!test_bit(STATUS_READY, &priv->status))
 111                 return -EBUSY;
 112
 113         if (priv->blink_on == on && priv->blink_off == off)
 114                 return 0;
 115
 116         if (off == 0) {
 117                 /* led is SOLID_ON */
 118                 on = IWL_LED_SOLID;
 119         }
 120
 121         IWL_DEBUG_LED(priv, "Led blink time compensation=%u\n",
 122                         priv->cfg->base_params->led_compensation);
 123         led_cmd.on = iwl_legacy_blink_compensation(priv, on,
 124                                 priv->cfg->base_params->led_compensation);
 125         led_cmd.off = iwl_legacy_blink_compensation(priv, off,
 126                                 priv->cfg->base_params->led_compensation);
 127
 128         ret = priv->cfg->ops->led->cmd(priv, &led_cmd);
 129         if (!ret) {
 130                 priv->blink_on = on;
 131                 priv->blink_off = off;
 132         }
 133         return ret;
 134 }
 135
 136 static void iwl_legacy_led_brightness_set(struct led_classdev *led_cdev,
 137                                    enum led_brightness brightness)
 138 {
 139         struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
 140         unsigned long on = 0;
 141
 142         if (brightness > 0)
 143                 on = IWL_LED_SOLID;
 144
 145         iwl_legacy_led_cmd(priv, on, 0);
 146 }
 147
 148 static int iwl_legacy_led_blink_set(struct led_classdev *led_cdev,
 149                              unsigned long *delay_on,
 150                              unsigned long *delay_off)
 151 {
 152         struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
 153
 154         return iwl_legacy_led_cmd(priv, *delay_on, *delay_off);
 155 }
 156
 157 void iwl_legacy_leds_init(struct iwl_priv *priv)
 158 {
 159         int mode = led_mode;
 160         int ret;
 161
 162         if (mode == IWL_LED_DEFAULT)
 163                 mode = priv->cfg->led_mode;
 164
 165         priv->led.name = kasprintf(GFP_KERNEL, "%s-led",
 166                                    wiphy_name(priv->hw->wiphy));
 167         priv->led.brightness_set = iwl_legacy_led_brightness_set;
 168         priv->led.blink_set = iwl_legacy_led_blink_set;
 169         priv->led.max_brightness = 1;
 170
 171         switch (mode) {
 172         case IWL_LED_DEFAULT:
 173                 WARN_ON(1);
 174                 break;
 175         case IWL_LED_BLINK:
 176                 priv->led.default_trigger =
 177                         ieee80211_create_tpt_led_trigger(priv->hw,
 178                                         IEEE80211_TPT_LEDTRIG_FL_CONNECTED,
 179                                         iwl_blink, ARRAY_SIZE(iwl_blink));
 180                 break;
 181         case IWL_LED_RF_STATE:
 182                 priv->led.default_trigger =
 183                         ieee80211_get_radio_led_name(priv->hw);
 184                 break;
 185         }
 186
 187         ret = led_classdev_register(&priv->pci_dev->dev, &priv->led);
 188         if (ret) {
 189                 kfree(priv->led.name);
 190                 return;
 191         }
 192
 193         priv->led_registered = true;
 194 }
 195 EXPORT_SYMBOL(iwl_legacy_leds_init);
 196
 197 void iwl_legacy_leds_exit(struct iwl_priv *priv)
 198 {
 199         if (!priv->led_registered)
 200                 return;
 201
 202         led_classdev_unregister(&priv->led);
 203         kfree(priv->led.name);
 204 }
 205 EXPORT_SYMBOL(iwl_legacy_leds_exit);