drivers/leds/ledtrig-sleep.c

   1 /* drivers/leds/ledtrig-sleep.c
   2  *
   3  * Copyright (C) 2007 Google, Inc.
   4  *
   5  * This software is licensed under the terms of the GNU General Public
   6  * License version 2, as published by the Free Software Foundation, and
   7  * may be copied, distributed, and modified under those terms.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  */
  15
  16 #include <linux/earlysuspend.h>
  17 #include <linux/leds.h>
  18 #include <linux/suspend.h>
  19
  20 static int ledtrig_sleep_pm_callback(struct notifier_block *nfb,
  21                                         unsigned long action,
  22                                         void *ignored);
  23
  24 DEFINE_LED_TRIGGER(ledtrig_sleep)
  25 static struct notifier_block ledtrig_sleep_pm_notifier = {
  26         .notifier_call = ledtrig_sleep_pm_callback,
  27         .priority = 0,
  28 };
  29
  30 static void ledtrig_sleep_early_suspend(struct early_suspend *h)
  31 {
  32         led_trigger_event(ledtrig_sleep, LED_FULL);
  33 }
  34
  35 static void ledtrig_sleep_early_resume(struct early_suspend *h)
  36 {
  37         led_trigger_event(ledtrig_sleep, LED_OFF);
  38 }
  39
  40 static struct early_suspend ledtrig_sleep_early_suspend_handler = {
  41         .suspend = ledtrig_sleep_early_suspend,
  42         .resume = ledtrig_sleep_early_resume,
  43 };
  44
  45 static int ledtrig_sleep_pm_callback(struct notifier_block *nfb,
  46                                         unsigned long action,
  47                                         void *ignored)
  48 {
  49         switch (action) {
  50         case PM_HIBERNATION_PREPARE:
  51         case PM_SUSPEND_PREPARE:
  52                 led_trigger_event(ledtrig_sleep, LED_OFF);
  53                 return NOTIFY_OK;
  54         case PM_POST_HIBERNATION:
  55         case PM_POST_SUSPEND:
  56                 led_trigger_event(ledtrig_sleep, LED_FULL);
  57                 return NOTIFY_OK;
  58         }
  59
  60         return NOTIFY_DONE;
  61 }
  62
  63 static int __init ledtrig_sleep_init(void)
  64 {
  65         led_trigger_register_simple("sleep", &ledtrig_sleep);
  66         register_pm_notifier(&ledtrig_sleep_pm_notifier);
  67         register_early_suspend(&ledtrig_sleep_early_suspend_handler);
  68         return 0;
  69 }
  70
  71 static void __exit ledtrig_sleep_exit(void)
  72 {
  73         unregister_early_suspend(&ledtrig_sleep_early_suspend_handler);
  74         unregister_pm_notifier(&ledtrig_sleep_pm_notifier);
  75         led_trigger_unregister_simple(ledtrig_sleep);
  76 }
  77
  78 module_init(ledtrig_sleep_init);
  79 module_exit(ledtrig_sleep_exit);
  80