/*
   * wakeup.c - support wakeup devices
   * Copyright (C) 2004 Li Shaohua <shaohua.li@intel.com>
   */
  
  #include <linux/init.h>
  #include <linux/acpi.h>
  #include <acpi/acpi_drivers.h>
  #include <linux/kernel.h>
  #include <linux/types.h>

  
  #include "internal.h"

  #include "sleep.h"

  /*
   * We didn't lock acpi_device_lock in the file, because it invokes oops in
   * suspend/resume and isn't really required as this is called in S-state. At
   * that time, there is no device hotplug
   **/

  #define _COMPONENT		ACPI_SYSTEM_COMPONENT

  ACPI_MODULE_NAME("wakeup_devices")

  /**

   * acpi_enable_wakeup_devices - Enable wake-up device GPEs.

   * @sleep_state: ACPI system sleep state.
   *

   * Enable wakeup device power of devices with the state.enable flag set and set
   * the wakeup enable mask bits in the GPE registers that correspond to wakeup
   * devices.

   */

  void acpi_enable_wakeup_devices(u8 sleep_state)

  {

  	struct list_head *node, *next;

  	list_for_each_safe(node, next, &acpi_wakeup_device_list) {

  		struct acpi_device *dev =
  			container_of(node, struct acpi_device, wakeup_list);

  		if (!dev->wakeup.flags.valid

  		    || sleep_state > (u32) dev->wakeup.sleep_state
  		    || !(device_may_wakeup(&dev->dev)
  		        || dev->wakeup.prepare_count))

  			continue;

  		if (device_may_wakeup(&dev->dev))

  			acpi_enable_wakeup_device_power(dev, sleep_state);

  		/* The wake-up power should have been enabled already. */

  		acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number,

  				ACPI_GPE_ENABLE);

  	}

  }
  
  /**

   * acpi_disable_wakeup_devices - Disable devices' wakeup capability.

   * @sleep_state: ACPI system sleep state.

   */

  void acpi_disable_wakeup_devices(u8 sleep_state)

  {

  	struct list_head *node, *next;

  	list_for_each_safe(node, next, &acpi_wakeup_device_list) {

  		struct acpi_device *dev =
  			container_of(node, struct acpi_device, wakeup_list);

  		if (!dev->wakeup.flags.valid

  		    || sleep_state > (u32) dev->wakeup.sleep_state
  		    || !(device_may_wakeup(&dev->dev)
  		        || dev->wakeup.prepare_count))

  			continue;

  		acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number,

  				ACPI_GPE_DISABLE);

  		if (device_may_wakeup(&dev->dev))

  			acpi_disable_wakeup_device_power(dev);

  	}

  }

  int __init acpi_wakeup_device_init(void)

  {

  	struct list_head *node, *next;

  	mutex_lock(&acpi_device_lock);

  	list_for_each_safe(node, next, &acpi_wakeup_device_list) {

  		struct acpi_device *dev = container_of(node,
  						       struct acpi_device,
  						       wakeup_list);

  		if (device_can_wakeup(&dev->dev)) {
  			/* Button GPEs are supposed to be always enabled. */
  			acpi_enable_gpe(dev->wakeup.gpe_device,
  					dev->wakeup.gpe_number);

  			device_set_wakeup_enable(&dev->dev, true);

  		}

  	}

  	mutex_unlock(&acpi_device_lock);

  	return 0;
  }