1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * wakeup.c - support wakeup devices
4 * Copyright (C) 2004 Li Shaohua <shaohua.li@intel.com>
5 */
6
7 #include <linux/init.h>
8 #include <linux/acpi.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
21 ACPI_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 */
acpi_enable_wakeup_devices(u8 sleep_state)31 void 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 */
acpi_disable_wakeup_devices(u8 sleep_state)58 void 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
acpi_wakeup_device_init(void)80 int __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
