drivers/net/wireless/rt2x00/rt2x00leds.c

   1 /*
   2         Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00lib
  23         Abstract: rt2x00 led specific routines.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28
  29 #include "rt2x00.h"
  30 #include "rt2x00lib.h"
  31
  32 void rt2x00leds_led_quality(struct rt2x00_dev *rt2x00dev, int rssi)
  33 {
  34         struct rt2x00_led *led = &rt2x00dev->led_qual;
  35         unsigned int brightness;
  36
  37         if ((led->type != LED_TYPE_QUALITY) || !(led->flags & LED_REGISTERED))
  38                 return;
  39
  40         /*
  41          * Led handling requires a positive value for the rssi,
  42          * to do that correctly we need to add the correction.
  43          */
  44         rssi += rt2x00dev->rssi_offset;
  45
  46         /*
  47          * Get the rssi level, this is used to convert the rssi
  48          * to a LED value inside the range LED_OFF - LED_FULL.
  49          */
  50         if (rssi <= 30)
  51                 rssi = 0;
  52         else if (rssi <= 39)
  53                 rssi = 1;
  54         else if (rssi <= 49)
  55                 rssi = 2;
  56         else if (rssi <= 53)
  57                 rssi = 3;
  58         else if (rssi <= 63)
  59                 rssi = 4;
  60         else
  61                 rssi = 5;
  62
  63         /*
  64          * Note that we must _not_ send LED_OFF since the driver
  65          * is going to calculate the value and might use it in a
  66          * division.
  67          */
  68         brightness = ((LED_FULL / 6) * rssi) + 1;
  69         if (brightness != led->led_dev.brightness) {
  70                 led->led_dev.brightness_set(&led->led_dev, brightness);
  71                 led->led_dev.brightness = brightness;
  72         }
  73 }
  74
  75 void rt2x00led_led_activity(struct rt2x00_dev *rt2x00dev, bool enabled)
  76 {
  77         struct rt2x00_led *led = &rt2x00dev->led_qual;
  78         unsigned int brightness;
  79
  80         if ((led->type != LED_TYPE_ACTIVITY) || !(led->flags & LED_REGISTERED))
  81                 return;
  82
  83         brightness = enabled ? LED_FULL : LED_OFF;
  84         if (brightness != led->led_dev.brightness) {
  85                 led->led_dev.brightness_set(&led->led_dev, brightness);
  86                 led->led_dev.brightness = brightness;
  87         }
  88 }
  89
  90 void rt2x00leds_led_assoc(struct rt2x00_dev *rt2x00dev, bool enabled)
  91 {
  92         struct rt2x00_led *led = &rt2x00dev->led_assoc;
  93         unsigned int brightness;
  94
  95         if ((led->type != LED_TYPE_ASSOC) || !(led->flags & LED_REGISTERED))
  96                 return;
  97
  98         brightness = enabled ? LED_FULL : LED_OFF;
  99         if (brightness != led->led_dev.brightness) {
 100                 led->led_dev.brightness_set(&led->led_dev, brightness);
 101                 led->led_dev.brightness = brightness;
 102         }
 103 }
 104
 105 void rt2x00leds_led_radio(struct rt2x00_dev *rt2x00dev, bool enabled)
 106 {
 107         struct rt2x00_led *led = &rt2x00dev->led_radio;
 108         unsigned int brightness;
 109
 110         if ((led->type != LED_TYPE_RADIO) || !(led->flags & LED_REGISTERED))
 111                 return;
 112
 113         brightness = enabled ? LED_FULL : LED_OFF;
 114         if (brightness != led->led_dev.brightness) {
 115                 led->led_dev.brightness_set(&led->led_dev, brightness);
 116                 led->led_dev.brightness = brightness;
 117         }
 118 }
 119
 120 static int rt2x00leds_register_led(struct rt2x00_dev *rt2x00dev,
 121                                    struct rt2x00_led *led,
 122                                    const char *name)
 123 {
 124         struct device *device = wiphy_dev(rt2x00dev->hw->wiphy);
 125         int retval;
 126
 127         led->led_dev.name = name;
 128
 129         retval = led_classdev_register(device, &led->led_dev);
 130         if (retval) {
 131                 ERROR(rt2x00dev, "Failed to register led handler.\n");
 132                 return retval;
 133         }
 134
 135         led->flags |= LED_REGISTERED;
 136
 137         return 0;
 138 }
 139
 140 void rt2x00leds_register(struct rt2x00_dev *rt2x00dev)
 141 {
 142         char dev_name[16];
 143         char name[32];
 144         int retval;
 145         unsigned long on_period;
 146         unsigned long off_period;
 147
 148         snprintf(dev_name, sizeof(dev_name), "%s-%s",
 149                  rt2x00dev->ops->name, wiphy_name(rt2x00dev->hw->wiphy));
 150
 151         if (rt2x00dev->led_radio.flags & LED_INITIALIZED) {
 152                 snprintf(name, sizeof(name), "%s:radio", dev_name);
 153
 154                 retval = rt2x00leds_register_led(rt2x00dev,
 155                                                  &rt2x00dev->led_radio,
 156                                                  name);
 157                 if (retval)
 158                         goto exit_fail;
 159         }
 160
 161         if (rt2x00dev->led_assoc.flags & LED_INITIALIZED) {
 162                 snprintf(name, sizeof(name), "%s:assoc", dev_name);
 163
 164                 retval = rt2x00leds_register_led(rt2x00dev,
 165                                                  &rt2x00dev->led_assoc,
 166                                                  name);
 167                 if (retval)
 168                         goto exit_fail;
 169         }
 170
 171         if (rt2x00dev->led_qual.flags & LED_INITIALIZED) {
 172                 snprintf(name, sizeof(name), "%s:quality", dev_name);
 173
 174                 retval = rt2x00leds_register_led(rt2x00dev,
 175                                                  &rt2x00dev->led_qual,
 176                                                  name);
 177                 if (retval)
 178                         goto exit_fail;
 179         }
 180
 181         /*
 182          * Initialize blink time to default value:
 183          * On period: 70ms
 184          * Off period: 30ms
 185          */
 186         if (rt2x00dev->led_radio.led_dev.blink_set) {
 187                 on_period = 70;
 188                 off_period = 30;
 189                 rt2x00dev->led_radio.led_dev.blink_set(
 190                     &rt2x00dev->led_radio.led_dev, &on_period, &off_period);
 191         }
 192
 193         return;
 194
 195 exit_fail:
 196         rt2x00leds_unregister(rt2x00dev);
 197 }
 198
 199 static void rt2x00leds_unregister_led(struct rt2x00_led *led)
 200 {
 201         led_classdev_unregister(&led->led_dev);
 202         led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 203         led->flags &= ~LED_REGISTERED;
 204 }
 205
 206 void rt2x00leds_unregister(struct rt2x00_dev *rt2x00dev)
 207 {
 208         if (rt2x00dev->led_qual.flags & LED_REGISTERED)
 209                 rt2x00leds_unregister_led(&rt2x00dev->led_qual);
 210         if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
 211                 rt2x00leds_unregister_led(&rt2x00dev->led_assoc);
 212         if (rt2x00dev->led_radio.flags & LED_REGISTERED)
 213                 rt2x00leds_unregister_led(&rt2x00dev->led_radio);
 214 }
 215
 216 void rt2x00leds_suspend(struct rt2x00_dev *rt2x00dev)
 217 {
 218         if (rt2x00dev->led_qual.flags & LED_REGISTERED)
 219                 led_classdev_suspend(&rt2x00dev->led_qual.led_dev);
 220         if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
 221                 led_classdev_suspend(&rt2x00dev->led_assoc.led_dev);
 222         if (rt2x00dev->led_radio.flags & LED_REGISTERED)
 223                 led_classdev_suspend(&rt2x00dev->led_radio.led_dev);
 224 }
 225
 226 void rt2x00leds_resume(struct rt2x00_dev *rt2x00dev)
 227 {
 228         if (rt2x00dev->led_radio.flags & LED_REGISTERED)
 229                 led_classdev_resume(&rt2x00dev->led_radio.led_dev);
 230         if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
 231                 led_classdev_resume(&rt2x00dev->led_assoc.led_dev);
 232         if (rt2x00dev->led_qual.flags & LED_REGISTERED)
 233                 led_classdev_resume(&rt2x00dev->led_qual.led_dev);
 234 }