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