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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
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> | |
1da177e4 LT |
9 | #include <linux/kernel.h> |
10 | #include <linux/types.h> | |
e60cc7a6 BH |
11 | |
12 | #include "internal.h" | |
1da177e4 LT |
13 | #include "sleep.h" |
14 | ||
2a17958b HG |
15 | struct acpi_wakeup_handler { |
16 | struct list_head list_node; | |
17 | bool (*wakeup)(void *context); | |
18 | void *context; | |
19 | }; | |
20 | ||
21 | static LIST_HEAD(acpi_wakeup_handler_head); | |
22 | static DEFINE_MUTEX(acpi_wakeup_handler_mutex); | |
23 | ||
9090589d SL |
24 | /* |
25 | * We didn't lock acpi_device_lock in the file, because it invokes oops in | |
26 | * suspend/resume and isn't really required as this is called in S-state. At | |
27 | * that time, there is no device hotplug | |
28 | **/ | |
1da177e4 | 29 | #define _COMPONENT ACPI_SYSTEM_COMPONENT |
4be44fcd | 30 | ACPI_MODULE_NAME("wakeup_devices") |
1da177e4 | 31 | |
1da177e4 | 32 | /** |
78f5f023 | 33 | * acpi_enable_wakeup_devices - Enable wake-up device GPEs. |
9630bdd9 RW |
34 | * @sleep_state: ACPI system sleep state. |
35 | * | |
78f5f023 RW |
36 | * Enable wakeup device power of devices with the state.enable flag set and set |
37 | * the wakeup enable mask bits in the GPE registers that correspond to wakeup | |
38 | * devices. | |
1da177e4 | 39 | */ |
78f5f023 | 40 | void acpi_enable_wakeup_devices(u8 sleep_state) |
1da177e4 | 41 | { |
4be44fcd | 42 | struct list_head *node, *next; |
1da177e4 | 43 | |
1da177e4 | 44 | list_for_each_safe(node, next, &acpi_wakeup_device_list) { |
9b039330 AS |
45 | struct acpi_device *dev = |
46 | container_of(node, struct acpi_device, wakeup_list); | |
eb9d0fe4 | 47 | |
e8b6f970 | 48 | if (!dev->wakeup.flags.valid |
f2b56bc8 RW |
49 | || sleep_state > (u32) dev->wakeup.sleep_state |
50 | || !(device_may_wakeup(&dev->dev) | |
51 | || dev->wakeup.prepare_count)) | |
1da177e4 | 52 | continue; |
9630bdd9 | 53 | |
f2b56bc8 | 54 | if (device_may_wakeup(&dev->dev)) |
78f5f023 RW |
55 | acpi_enable_wakeup_device_power(dev, sleep_state); |
56 | ||
9630bdd9 | 57 | /* The wake-up power should have been enabled already. */ |
3a37898d | 58 | acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number, |
e8b6f970 | 59 | ACPI_GPE_ENABLE); |
1da177e4 | 60 | } |
1da177e4 LT |
61 | } |
62 | ||
63 | /** | |
78f5f023 | 64 | * acpi_disable_wakeup_devices - Disable devices' wakeup capability. |
9630bdd9 | 65 | * @sleep_state: ACPI system sleep state. |
1da177e4 | 66 | */ |
78f5f023 | 67 | void acpi_disable_wakeup_devices(u8 sleep_state) |
1da177e4 | 68 | { |
4be44fcd | 69 | struct list_head *node, *next; |
1da177e4 | 70 | |
1da177e4 | 71 | list_for_each_safe(node, next, &acpi_wakeup_device_list) { |
9b039330 AS |
72 | struct acpi_device *dev = |
73 | container_of(node, struct acpi_device, wakeup_list); | |
1da177e4 | 74 | |
e8b6f970 | 75 | if (!dev->wakeup.flags.valid |
f2b56bc8 RW |
76 | || sleep_state > (u32) dev->wakeup.sleep_state |
77 | || !(device_may_wakeup(&dev->dev) | |
78 | || dev->wakeup.prepare_count)) | |
1da177e4 LT |
79 | continue; |
80 | ||
3a37898d | 81 | acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number, |
e8b6f970 RW |
82 | ACPI_GPE_DISABLE); |
83 | ||
f2b56bc8 | 84 | if (device_may_wakeup(&dev->dev)) |
e8b6f970 | 85 | acpi_disable_wakeup_device_power(dev); |
1da177e4 | 86 | } |
1da177e4 LT |
87 | } |
88 | ||
201b8c65 | 89 | int __init acpi_wakeup_device_init(void) |
1da177e4 | 90 | { |
4be44fcd | 91 | struct list_head *node, *next; |
1da177e4 | 92 | |
9090589d | 93 | mutex_lock(&acpi_device_lock); |
1da177e4 | 94 | list_for_each_safe(node, next, &acpi_wakeup_device_list) { |
4be44fcd LB |
95 | struct acpi_device *dev = container_of(node, |
96 | struct acpi_device, | |
97 | wakeup_list); | |
2a5d2428 RW |
98 | if (device_can_wakeup(&dev->dev)) { |
99 | /* Button GPEs are supposed to be always enabled. */ | |
100 | acpi_enable_gpe(dev->wakeup.gpe_device, | |
101 | dev->wakeup.gpe_number); | |
f2b56bc8 | 102 | device_set_wakeup_enable(&dev->dev, true); |
2a5d2428 | 103 | } |
1da177e4 | 104 | } |
9090589d | 105 | mutex_unlock(&acpi_device_lock); |
1da177e4 LT |
106 | return 0; |
107 | } | |
2a17958b HG |
108 | |
109 | /** | |
110 | * acpi_register_wakeup_handler - Register wakeup handler | |
111 | * @wake_irq: The IRQ through which the device may receive wakeups | |
112 | * @wakeup: Wakeup-handler to call when the SCI has triggered a wakeup | |
113 | * @context: Context to pass to the handler when calling it | |
114 | * | |
115 | * Drivers which may share an IRQ with the SCI can use this to register | |
116 | * a handler which returns true when the device they are managing wants | |
117 | * to trigger a wakeup. | |
118 | */ | |
119 | int acpi_register_wakeup_handler(int wake_irq, bool (*wakeup)(void *context), | |
120 | void *context) | |
121 | { | |
122 | struct acpi_wakeup_handler *handler; | |
123 | ||
124 | /* | |
125 | * If the device is not sharing its IRQ with the SCI, there is no | |
126 | * need to register the handler. | |
127 | */ | |
128 | if (!acpi_sci_irq_valid() || wake_irq != acpi_sci_irq) | |
129 | return 0; | |
130 | ||
131 | handler = kmalloc(sizeof(*handler), GFP_KERNEL); | |
132 | if (!handler) | |
133 | return -ENOMEM; | |
134 | ||
135 | handler->wakeup = wakeup; | |
136 | handler->context = context; | |
137 | ||
138 | mutex_lock(&acpi_wakeup_handler_mutex); | |
139 | list_add(&handler->list_node, &acpi_wakeup_handler_head); | |
140 | mutex_unlock(&acpi_wakeup_handler_mutex); | |
141 | ||
142 | return 0; | |
143 | } | |
144 | EXPORT_SYMBOL_GPL(acpi_register_wakeup_handler); | |
145 | ||
146 | /** | |
147 | * acpi_unregister_wakeup_handler - Unregister wakeup handler | |
148 | * @wakeup: Wakeup-handler passed to acpi_register_wakeup_handler() | |
149 | * @context: Context passed to acpi_register_wakeup_handler() | |
150 | */ | |
151 | void acpi_unregister_wakeup_handler(bool (*wakeup)(void *context), | |
152 | void *context) | |
153 | { | |
154 | struct acpi_wakeup_handler *handler; | |
155 | ||
156 | mutex_lock(&acpi_wakeup_handler_mutex); | |
157 | list_for_each_entry(handler, &acpi_wakeup_handler_head, list_node) { | |
158 | if (handler->wakeup == wakeup && handler->context == context) { | |
159 | list_del(&handler->list_node); | |
160 | kfree(handler); | |
161 | break; | |
162 | } | |
163 | } | |
164 | mutex_unlock(&acpi_wakeup_handler_mutex); | |
165 | } | |
166 | EXPORT_SYMBOL_GPL(acpi_unregister_wakeup_handler); | |
167 | ||
168 | bool acpi_check_wakeup_handlers(void) | |
169 | { | |
170 | struct acpi_wakeup_handler *handler; | |
171 | ||
172 | /* No need to lock, nothing else is running when we're called. */ | |
173 | list_for_each_entry(handler, &acpi_wakeup_handler_head, list_node) { | |
174 | if (handler->wakeup(handler->context)) | |
175 | return true; | |
176 | } | |
177 | ||
178 | return false; | |
179 | } |