Arve Hjønnevåg | d3bf8ae | 2008-03-30 21:47:13 -0700 | [diff] [blame] | 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 | |