linux/drivers/acpi/wakeup.c
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   1/*
   2 * wakeup.c - support wakeup devices
   3 * Copyright (C) 2004 Li Shaohua <shaohua.li@intel.com>
   4 */
   5
   6#include <linux/init.h>
   7#include <linux/acpi.h>
   8#include <acpi/acpi_drivers.h>
   9#include <linux/kernel.h>
  10#include <linux/types.h>
  11
  12#include "internal.h"
  13#include "sleep.h"
  14
  15/*
  16 * We didn't lock acpi_device_lock in the file, because it invokes oops in
  17 * suspend/resume and isn't really required as this is called in S-state. At
  18 * that time, there is no device hotplug
  19 **/
  20#define _COMPONENT              ACPI_SYSTEM_COMPONENT
  21ACPI_MODULE_NAME("wakeup_devices")
  22
  23/**
  24 * acpi_enable_wakeup_devices - Enable wake-up device GPEs.
  25 * @sleep_state: ACPI system sleep state.
  26 *
  27 * Enable wakeup device power of devices with the state.enable flag set and set
  28 * the wakeup enable mask bits in the GPE registers that correspond to wakeup
  29 * devices.
  30 */
  31void acpi_enable_wakeup_devices(u8 sleep_state)
  32{
  33        struct list_head *node, *next;
  34
  35        list_for_each_safe(node, next, &acpi_wakeup_device_list) {
  36                struct acpi_device *dev =
  37                        container_of(node, struct acpi_device, wakeup_list);
  38
  39                if (!dev->wakeup.flags.valid
  40                    || sleep_state > (u32) dev->wakeup.sleep_state
  41                    || !(device_may_wakeup(&dev->dev)
  42                        || dev->wakeup.prepare_count))
  43                        continue;
  44
  45                if (device_may_wakeup(&dev->dev))
  46                        acpi_enable_wakeup_device_power(dev, sleep_state);
  47
  48                /* The wake-up power should have been enabled already. */
  49                acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
  50                                ACPI_GPE_ENABLE);
  51        }
  52}
  53
  54/**
  55 * acpi_disable_wakeup_devices - Disable devices' wakeup capability.
  56 * @sleep_state: ACPI system sleep state.
  57 */
  58void acpi_disable_wakeup_devices(u8 sleep_state)
  59{
  60        struct list_head *node, *next;
  61
  62        list_for_each_safe(node, next, &acpi_wakeup_device_list) {
  63                struct acpi_device *dev =
  64                        container_of(node, struct acpi_device, wakeup_list);
  65
  66                if (!dev->wakeup.flags.valid
  67                    || sleep_state > (u32) dev->wakeup.sleep_state
  68                    || !(device_may_wakeup(&dev->dev)
  69                        || dev->wakeup.prepare_count))
  70                        continue;
  71
  72                acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
  73                                ACPI_GPE_DISABLE);
  74
  75                if (device_may_wakeup(&dev->dev))
  76                        acpi_disable_wakeup_device_power(dev);
  77        }
  78}
  79
  80int __init acpi_wakeup_device_init(void)
  81{
  82        struct list_head *node, *next;
  83
  84        mutex_lock(&acpi_device_lock);
  85        list_for_each_safe(node, next, &acpi_wakeup_device_list) {
  86                struct acpi_device *dev = container_of(node,
  87                                                       struct acpi_device,
  88                                                       wakeup_list);
  89                if (device_can_wakeup(&dev->dev)) {
  90                        /* Button GPEs are supposed to be always enabled. */
  91                        acpi_enable_gpe(dev->wakeup.gpe_device,
  92                                        dev->wakeup.gpe_number);
  93                        device_set_wakeup_enable(&dev->dev, true);
  94                }
  95        }
  96        mutex_unlock(&acpi_device_lock);
  97        return 0;
  98}
  99
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