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 rt2x00leds_led_assoc(struct rt2x00_dev *rt2x00dev, bool enabled)
  76 {
  77         struct rt2x00_led *led = &rt2x00dev->led_assoc;
  78         unsigned int brightness;
  79
  80         if ((led->type != LED_TYPE_ASSOC) || !(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_radio(struct rt2x00_dev *rt2x00dev, bool enabled)
  91 {
  92         struct rt2x00_led *led = &rt2x00dev->led_radio;
  93         unsigned int brightness;
  94
  95         if ((led->type != LED_TYPE_RADIO) || !(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 static int rt2x00leds_register_led(struct rt2x00_dev *rt2x00dev,
 106                                    struct rt2x00_led *led,
 107                                    const char *name)
 108 {
 109         struct device *device = wiphy_dev(rt2x00dev->hw->wiphy);
 110         int retval;
 111
 112         led->led_dev.name = name;
 113
 114         retval = led_classdev_register(device, &led->led_dev);
 115         if (retval) {
 116                 ERROR(rt2x00dev, "Failed to register led handler.\n");
 117                 return retval;
 118         }
 119
 120         led->flags |= LED_REGISTERED;
 121
 122         return 0;
 123 }
 124
 125 void rt2x00leds_register(struct rt2x00_dev *rt2x00dev)
 126 {
 127         char dev_name[16];
 128         char name[32];
 129         int retval;
 130         unsigned long on_period;
 131         unsigned long off_period;
 132
 133         snprintf(dev_name, sizeof(dev_name), "%s-%s",
 134                  rt2x00dev->ops->name, wiphy_name(rt2x00dev->hw->wiphy));
 135
 136         if (rt2x00dev->led_radio.flags & LED_INITIALIZED) {
 137                 snprintf(name, sizeof(name), "%s:radio", dev_name);
 138
 139                 retval = rt2x00leds_register_led(rt2x00dev,
 140                                                  &rt2x00dev->led_radio,
 141                                                  name);
 142                 if (retval)
 143                         goto exit_fail;
 144         }
 145
 146         if (rt2x00dev->led_assoc.flags & LED_INITIALIZED) {
 147                 snprintf(name, sizeof(name), "%s:assoc", dev_name);
 148
 149                 retval = rt2x00leds_register_led(rt2x00dev,
 150                                                  &rt2x00dev->led_assoc,
 151                                                  name);
 152                 if (retval)
 153                         goto exit_fail;
 154         }
 155
 156         if (rt2x00dev->led_qual.flags & LED_INITIALIZED) {
 157                 snprintf(name, sizeof(name), "%s:quality", dev_name);
 158
 159                 retval = rt2x00leds_register_led(rt2x00dev,
 160                                                  &rt2x00dev->led_qual,
 161                                                  name);
 162                 if (retval)
 163                         goto exit_fail;
 164         }
 165
 166         /*
 167          * Initialize blink time to default value:
 168          * On period: 70ms
 169          * Off period: 30ms
 170          */
 171         if (rt2x00dev->led_radio.led_dev.blink_set) {
 172                 on_period = 70;
 173                 off_period = 30;
 174                 rt2x00dev->led_radio.led_dev.blink_set(
 175                     &rt2x00dev->led_radio.led_dev, &on_period, &off_period);
 176         }
 177
 178         return;
 179
 180 exit_fail:
 181         rt2x00leds_unregister(rt2x00dev);
 182 }
 183
 184 static void rt2x00leds_unregister_led(struct rt2x00_led *led)
 185 {
 186         led_classdev_unregister(&led->led_dev);
 187         led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 188         led->flags &= ~LED_REGISTERED;
 189 }
 190
 191 void rt2x00leds_unregister(struct rt2x00_dev *rt2x00dev)
 192 {
 193         if (rt2x00dev->led_qual.flags & LED_REGISTERED)
 194                 rt2x00leds_unregister_led(&rt2x00dev->led_qual);
 195         if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
 196                 rt2x00leds_unregister_led(&rt2x00dev->led_assoc);
 197         if (rt2x00dev->led_radio.flags & LED_REGISTERED)
 198                 rt2x00leds_unregister_led(&rt2x00dev->led_radio);
 199 }
 200
 201 void rt2x00leds_suspend(struct rt2x00_dev *rt2x00dev)
 202 {
 203         if (rt2x00dev->led_qual.flags & LED_REGISTERED)
 204                 led_classdev_suspend(&rt2x00dev->led_qual.led_dev);
 205         if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
 206                 led_classdev_suspend(&rt2x00dev->led_assoc.led_dev);
 207         if (rt2x00dev->led_radio.flags & LED_REGISTERED)
 208                 led_classdev_suspend(&rt2x00dev->led_radio.led_dev);
 209 }
 210
 211 void rt2x00leds_resume(struct rt2x00_dev *rt2x00dev)
 212 {
 213         if (rt2x00dev->led_radio.flags & LED_REGISTERED)
 214                 led_classdev_resume(&rt2x00dev->led_radio.led_dev);
 215         if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
 216                 led_classdev_resume(&rt2x00dev->led_assoc.led_dev);
 217         if (rt2x00dev->led_qual.flags & LED_REGISTERED)
 218                 led_classdev_resume(&rt2x00dev->led_qual.led_dev);
 219 }