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 static void rt2x00led_led_simple(struct rt2x00_led *led, bool enabled)
  76 {
  77         unsigned int brightness = enabled ? LED_FULL : LED_OFF;
  78
  79         if (!(led->flags & LED_REGISTERED))
  80                 return;
  81
  82         led->led_dev.brightness_set(&led->led_dev, brightness);
  83         led->led_dev.brightness = brightness;
  84 }
  85
  86 void rt2x00led_led_activity(struct rt2x00_dev *rt2x00dev, bool enabled)
  87 {
  88         if (rt2x00dev->led_qual.type == LED_TYPE_ACTIVITY)
  89                 rt2x00led_led_simple(&rt2x00dev->led_qual, enabled);
  90 }
  91
  92 void rt2x00leds_led_assoc(struct rt2x00_dev *rt2x00dev, bool enabled)
  93 {
  94         if (rt2x00dev->led_assoc.type == LED_TYPE_ASSOC)
  95                 rt2x00led_led_simple(&rt2x00dev->led_assoc, enabled);
  96 }
  97
  98 void rt2x00leds_led_radio(struct rt2x00_dev *rt2x00dev, bool enabled)
  99 {
 100         if (rt2x00dev->led_radio.type == LED_TYPE_ASSOC)
 101                 rt2x00led_led_simple(&rt2x00dev->led_radio, enabled);
 102 }
 103
 104 static int rt2x00leds_register_led(struct rt2x00_dev *rt2x00dev,
 105                                    struct rt2x00_led *led,
 106                                    const char *name)
 107 {
 108         struct device *device = wiphy_dev(rt2x00dev->hw->wiphy);
 109         int retval;
 110
 111         led->led_dev.name = name;
 112         led->led_dev.brightness = LED_OFF;
 113
 114         /*
 115          * Ensure the LED is off, it might have been enabled
 116          * by the hardware when the device was powered on.
 117          */
 118         led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 119
 120         retval = led_classdev_register(device, &led->led_dev);
 121         if (retval) {
 122                 ERROR(rt2x00dev, "Failed to register led handler.\n");
 123                 return retval;
 124         }
 125
 126         led->flags |= LED_REGISTERED;
 127
 128         return 0;
 129 }
 130
 131 void rt2x00leds_register(struct rt2x00_dev *rt2x00dev)
 132 {
 133         char dev_name[16];
 134         char name[32];
 135         int retval;
 136         unsigned long on_period;
 137         unsigned long off_period;
 138
 139         snprintf(dev_name, sizeof(dev_name), "%s-%s",
 140                  rt2x00dev->ops->name, wiphy_name(rt2x00dev->hw->wiphy));
 141
 142         if (rt2x00dev->led_radio.flags & LED_INITIALIZED) {
 143                 snprintf(name, sizeof(name), "%s:radio", dev_name);
 144
 145                 retval = rt2x00leds_register_led(rt2x00dev,
 146                                                  &rt2x00dev->led_radio,
 147                                                  name);
 148                 if (retval)
 149                         goto exit_fail;
 150         }
 151
 152         if (rt2x00dev->led_assoc.flags & LED_INITIALIZED) {
 153                 snprintf(name, sizeof(name), "%s:assoc", dev_name);
 154
 155                 retval = rt2x00leds_register_led(rt2x00dev,
 156                                                  &rt2x00dev->led_assoc,
 157                                                  name);
 158                 if (retval)
 159                         goto exit_fail;
 160         }
 161
 162         if (rt2x00dev->led_qual.flags & LED_INITIALIZED) {
 163                 snprintf(name, sizeof(name), "%s:quality", dev_name);
 164
 165                 retval = rt2x00leds_register_led(rt2x00dev,
 166                                                  &rt2x00dev->led_qual,
 167                                                  name);
 168                 if (retval)
 169                         goto exit_fail;
 170         }
 171
 172         /*
 173          * Initialize blink time to default value:
 174          * On period: 70ms
 175          * Off period: 30ms
 176          */
 177         if (rt2x00dev->led_radio.led_dev.blink_set) {
 178                 on_period = 70;
 179                 off_period = 30;
 180                 rt2x00dev->led_radio.led_dev.blink_set(
 181                     &rt2x00dev->led_radio.led_dev, &on_period, &off_period);
 182         }
 183
 184         return;
 185
 186 exit_fail:
 187         rt2x00leds_unregister(rt2x00dev);
 188 }
 189
 190 static void rt2x00leds_unregister_led(struct rt2x00_led *led)
 191 {
 192         led_classdev_unregister(&led->led_dev);
 193
 194         /*
 195          * This might look weird, but when we are unregistering while
 196          * suspended the led is already off, and since we haven't
 197          * fully resumed yet, access to the device might not be
 198          * possible yet.
 199          */
 200         if (!(led->led_dev.flags & LED_SUSPENDED))
 201                 led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 202
 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 static inline void rt2x00leds_suspend_led(struct rt2x00_led *led)
 217 {
 218         led_classdev_suspend(&led->led_dev);
 219
 220         /* This shouldn't be needed, but just to be safe */
 221         led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 222         led->led_dev.brightness = LED_OFF;
 223 }
 224
 225 void rt2x00leds_suspend(struct rt2x00_dev *rt2x00dev)
 226 {
 227         if (rt2x00dev->led_qual.flags & LED_REGISTERED)
 228                 rt2x00leds_suspend_led(&rt2x00dev->led_qual);
 229         if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
 230                 rt2x00leds_suspend_led(&rt2x00dev->led_assoc);
 231         if (rt2x00dev->led_radio.flags & LED_REGISTERED)
 232                 rt2x00leds_suspend_led(&rt2x00dev->led_radio);
 233 }
 234
 235 static inline void rt2x00leds_resume_led(struct rt2x00_led *led)
 236 {
 237         led_classdev_resume(&led->led_dev);
 238
 239         /* Device might have enabled the LEDS during resume */
 240         led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 241         led->led_dev.brightness = LED_OFF;
 242 }
 243
 244 void rt2x00leds_resume(struct rt2x00_dev *rt2x00dev)
 245 {
 246         if (rt2x00dev->led_radio.flags & LED_REGISTERED)
 247                 rt2x00leds_resume_led(&rt2x00dev->led_radio);
 248         if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
 249                 rt2x00leds_resume_led(&rt2x00dev->led_assoc);
 250         if (rt2x00dev->led_qual.flags & LED_REGISTERED)
 251                 rt2x00leds_resume_led(&rt2x00dev->led_qual);
 252 }