pm_notifier 接收待机事件

相关函数位于kernel/power/main.c

使用时需要包含头文件linux/suspend.h

linux 在待机和唤醒时会发出一些事件，通过注册接口可以在接收到这些事件时做些处理。

使用方法:

struct notifier_block verify_pm_notifier; //定义变量

定义处理函数：

static int verify_pm_notifier_func(struct notifier_block *notifier, 
unsigned long pm_event, 
void *unused) 
{ 
switch (pm_event) { 
case PM_HIBERNATION_PREPARE: 
case PM_SUSPEND_PREPARE: 
verify_pm_suspend(); 
break; 
case PM_POST_RESTORE: 
/* Restore from hibernation failed. We need to clean 
* up in exactly the same way, so fall through. */ 
case PM_POST_HIBERNATION: 
case PM_POST_SUSPEND: 
verify_pm_resume(); 
break; 
case PM_RESTORE_PREPARE: 
default: 
break; 
} 
return NOTIFY_DONE; 
}

赋值： 
verify_pm_notifier.notifier_call = verify_pm_notifier_func; 
调用接口注册到pm notifier中： 
register_pm_notifier(&verify_pm_notifier);