LXR linux/drivers/acpi/wakeup.c

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