tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
21ACPI_MODULE_NAME("wakeup_devices")
22
23/**
24 * acpi_enable_wakeup_device_prep - Prepare wake-up devices.
25 * @sleep_state: ACPI system sleep state.
26 *
27 * Enable all wake-up devices' power, unless the requested system sleep state is
28 * too deep.
29 */
30void acpi_enable_wakeup_device_prep(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 = container_of(node,
36 struct acpi_device,
37 wakeup_list);
38
39 if (!dev->wakeup.flags.valid || !dev->wakeup.state.enabled
40 || (sleep_state > (u32) dev->wakeup.sleep_state))
41 continue;
42
43 acpi_enable_wakeup_device_power(dev, sleep_state);
44 }
45}
46
47/**
48 * acpi_enable_wakeup_device - Enable wake-up device GPEs.
49 * @sleep_state: ACPI system sleep state.
50 *
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
53 * GPEs here.
54 */
55void acpi_enable_wakeup_device(u8 sleep_state)
56{
57 struct list_head *node, *next;
58
59 /*
60 * Caution: this routine must be invoked when interrupt is disabled
61 * Refer ACPI2.0: P212
62 */
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);
66
67 if (!dev->wakeup.flags.valid)
68 continue;
69
70 if ((!dev->wakeup.state.enabled && !dev->wakeup.prepare_count)
71 || sleep_state > (u32) dev->wakeup.sleep_state)
72 continue;
73
74 /* The wake-up power should have been enabled already. */
75 acpi_set_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
76 ACPI_GPE_ENABLE);
77 }
78}
79
80/**
81 * acpi_disable_wakeup_device - Disable devices' wakeup capability.
82 * @sleep_state: ACPI system sleep state.
83 *
84 * This function only affects devices with wakeup.state.enabled set, which means
85 * that it reverses the changes made by acpi_enable_wakeup_device_prep().
86 */
87void acpi_disable_wakeup_device(u8 sleep_state)
88{
89 struct list_head *node, *next;
90
91 list_for_each_safe(node, next, &acpi_wakeup_device_list) {
92 struct acpi_device *dev =
93 container_of(node, struct acpi_device, wakeup_list);
94
95 if (!dev->wakeup.flags.valid || !dev->wakeup.state.enabled
96 || (sleep_state > (u32) dev->wakeup.sleep_state))
97 continue;
98
99 acpi_disable_wakeup_device_power(dev);
100 }
101}
102
103int __init acpi_wakeup_device_init(void)
104{
105 struct list_head *node, *next;
106
107 mutex_lock(&acpi_device_lock);
108 list_for_each_safe(node, next, &acpi_wakeup_device_list) {
109 struct acpi_device *dev = container_of(node,
110 struct acpi_device,
111 wakeup_list);
112 /* In case user doesn't load button driver */
113 if (!dev->wakeup.flags.always_enabled ||
114 dev->wakeup.state.enabled)
115 continue;
116 acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
117 ACPI_GPE_TYPE_WAKE);
118 dev->wakeup.state.enabled = 1;
119 }
120 mutex_unlock(&acpi_device_lock);
121 return 0;
122}