Root/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
21ACPI_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 */
31void 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            || sleep_state > (u32) dev->wakeup.sleep_state
41            || !(device_may_wakeup(&dev->dev)
42                || dev->wakeup.prepare_count))
43            continue;
44
45        if (device_may_wakeup(&dev->dev))
46            acpi_enable_wakeup_device_power(dev, sleep_state);
47
48        /* The wake-up power should have been enabled already. */
49        acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
50                ACPI_GPE_ENABLE);
51    }
52}
53
54/**
55 * acpi_disable_wakeup_devices - Disable devices' wakeup capability.
56 * @sleep_state: ACPI system sleep state.
57 */
58void acpi_disable_wakeup_devices(u8 sleep_state)
59{
60    struct list_head *node, *next;
61
62    list_for_each_safe(node, next, &acpi_wakeup_device_list) {
63        struct acpi_device *dev =
64            container_of(node, struct acpi_device, wakeup_list);
65
66        if (!dev->wakeup.flags.valid
67            || sleep_state > (u32) dev->wakeup.sleep_state
68            || !(device_may_wakeup(&dev->dev)
69                || dev->wakeup.prepare_count))
70            continue;
71
72        acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
73                ACPI_GPE_DISABLE);
74
75        if (device_may_wakeup(&dev->dev))
76            acpi_disable_wakeup_device_power(dev);
77    }
78}
79
80int __init acpi_wakeup_device_init(void)
81{
82    struct list_head *node, *next;
83
84    mutex_lock(&acpi_device_lock);
85    list_for_each_safe(node, next, &acpi_wakeup_device_list) {
86        struct acpi_device *dev = container_of(node,
87                               struct acpi_device,
88                               wakeup_list);
89        if (device_can_wakeup(&dev->dev)) {
90            /* Button GPEs are supposed to be always enabled. */
91            acpi_enable_gpe(dev->wakeup.gpe_device,
92                    dev->wakeup.gpe_number);
93            device_set_wakeup_enable(&dev->dev, true);
94        }
95    }
96    mutex_unlock(&acpi_device_lock);
97    return 0;
98}
99

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