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;
  
  extern void acpi_resume_power_resources(void);