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 <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
  21 ACPI_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  */
  31 void 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                     || !(dev->wakeup.state.enabled || dev->wakeup.prepare_count)
  41                     || sleep_state > (u32) dev->wakeup.sleep_state)
  42                         continue;
  43
  44                 if (dev->wakeup.state.enabled)
  45                         acpi_enable_wakeup_device_power(dev, sleep_state);
  46
  47                 /* The wake-up power should have been enabled already. */
  48                 acpi_gpe_wakeup(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  */
  57 void 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                     || !(dev->wakeup.state.enabled || dev->wakeup.prepare_count)
  67                     || (sleep_state > (u32) dev->wakeup.sleep_state))
  68                         continue;
  69
  70                 acpi_gpe_wakeup(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
  71                                 ACPI_GPE_DISABLE);
  72
  73                 if (dev->wakeup.state.enabled)
  74                         acpi_disable_wakeup_device_power(dev);
  75         }
  76 }
  77
  78 int __init acpi_wakeup_device_init(void)
  79 {
  80         struct list_head *node, *next;
  81
  82         mutex_lock(&acpi_device_lock);
  83         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
  84                 struct acpi_device *dev = container_of(node,
  85                                                        struct acpi_device,
  86                                                        wakeup_list);
  87                 if (dev->wakeup.flags.always_enabled)
  88                         dev->wakeup.state.enabled = 1;
  89         }
  90         mutex_unlock(&acpi_device_lock);
  91         return 0;
  92 }