2 * wakeup.c - support wakeup devices
3 * Copyright (C) 2004 Li Shaohua <shaohua.li@intel.com>
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>
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
20 #define _COMPONENT ACPI_SYSTEM_COMPONENT
21 ACPI_MODULE_NAME("wakeup_devices")
24 * acpi_enable_wakeup_device_prep - Prepare wake-up devices.
25 * @sleep_state: ACPI system sleep state.
27 * Enable all wake-up devices' power, unless the requested system sleep state is
30 void acpi_enable_wakeup_device_prep(u8 sleep_state)
32 struct list_head *node, *next;
34 list_for_each_safe(node, next, &acpi_wakeup_device_list) {
35 struct acpi_device *dev = container_of(node,
39 if (!dev->wakeup.flags.valid || !dev->wakeup.state.enabled
40 || (sleep_state > (u32) dev->wakeup.sleep_state))
43 acpi_enable_wakeup_device_power(dev, sleep_state);
48 * acpi_enable_wakeup_device - Enable wake-up device GPEs.
49 * @sleep_state: ACPI system sleep state.
51 * Enable all wake-up devices' GPEs, with the assumption that
52 * acpi_disable_all_gpes() was executed before, so we don't need to disable any
55 void acpi_enable_wakeup_device(u8 sleep_state)
57 struct list_head *node, *next;
60 * Caution: this routine must be invoked when interrupt is disabled
63 list_for_each_safe(node, next, &acpi_wakeup_device_list) {
64 struct acpi_device *dev =
65 container_of(node, struct acpi_device, wakeup_list);
67 if (!dev->wakeup.flags.valid
68 || !(dev->wakeup.state.enabled || dev->wakeup.prepare_count)
69 || sleep_state > (u32) dev->wakeup.sleep_state)
72 /* The wake-up power should have been enabled already. */
73 acpi_gpe_wakeup(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
79 * acpi_disable_wakeup_device - Disable devices' wakeup capability.
80 * @sleep_state: ACPI system sleep state.
82 * This function only affects devices with wakeup.state.enabled set, which means
83 * that it reverses the changes made by acpi_enable_wakeup_device_prep().
85 void acpi_disable_wakeup_device(u8 sleep_state)
87 struct list_head *node, *next;
89 list_for_each_safe(node, next, &acpi_wakeup_device_list) {
90 struct acpi_device *dev =
91 container_of(node, struct acpi_device, wakeup_list);
93 if (!dev->wakeup.flags.valid
94 || !(dev->wakeup.state.enabled || dev->wakeup.prepare_count)
95 || (sleep_state > (u32) dev->wakeup.sleep_state))
98 acpi_gpe_wakeup(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
101 if (dev->wakeup.state.enabled)
102 acpi_disable_wakeup_device_power(dev);
106 int __init acpi_wakeup_device_init(void)
108 struct list_head *node, *next;
110 mutex_lock(&acpi_device_lock);
111 list_for_each_safe(node, next, &acpi_wakeup_device_list) {
112 struct acpi_device *dev = container_of(node,
115 if (dev->wakeup.flags.always_enabled)
116 dev->wakeup.state.enabled = 1;
118 mutex_unlock(&acpi_device_lock);