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
  20 ACPI_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  */
  30 void 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  */
  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                     || 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
  79 int __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 }