1. 根目录:
2. drivers
3. acpi
4. sleep.h

extern int acpi_suspend(u32 state);

extern void acpi_enable_wakeup_devices(u8 sleep_state);
extern void acpi_disable_wakeup_devices(u8 sleep_state);

extern struct list_head acpi_wakeup_device_list;
extern struct mutex acpi_device_lock;