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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * pm_wakeup.h - Power management wakeup interface
4 *
5 * Copyright (C) 2008 Alan Stern
6 * Copyright (C) 2010 Rafael J. Wysocki, Novell Inc.
7 */
8
9#ifndef _LINUX_PM_WAKEUP_H
10#define _LINUX_PM_WAKEUP_H
11
12#ifndef _DEVICE_H_
13# error "Please do not include this file directly."
14#endif
15
16#include <linux/types.h>
17
18struct wake_irq;
19
20/**
21 * struct wakeup_source - Representation of wakeup sources
22 *
23 * @name: Name of the wakeup source
24 * @id: Wakeup source id
25 * @entry: Wakeup source list entry
26 * @lock: Wakeup source lock
27 * @wakeirq: Optional device specific wakeirq
28 * @timer: Wakeup timer list
29 * @timer_expires: Wakeup timer expiration
30 * @total_time: Total time this wakeup source has been active.
31 * @max_time: Maximum time this wakeup source has been continuously active.
32 * @last_time: Monotonic clock when the wakeup source's was touched last time.
33 * @prevent_sleep_time: Total time this source has been preventing autosleep.
34 * @event_count: Number of signaled wakeup events.
35 * @active_count: Number of times the wakeup source was activated.
36 * @relax_count: Number of times the wakeup source was deactivated.
37 * @expire_count: Number of times the wakeup source's timeout has expired.
38 * @wakeup_count: Number of times the wakeup source might abort suspend.
39 * @dev: Struct device for sysfs statistics about the wakeup source.
40 * @active: Status of the wakeup source.
41 * @autosleep_enabled: Autosleep is active, so update @prevent_sleep_time.
42 */
43struct wakeup_source {
44 const char *name;
45 int id;
46 struct list_head entry;
47 spinlock_t lock;
48 struct wake_irq *wakeirq;
49 struct timer_list timer;
50 unsigned long timer_expires;
51 ktime_t total_time;
52 ktime_t max_time;
53 ktime_t last_time;
54 ktime_t start_prevent_time;
55 ktime_t prevent_sleep_time;
56 unsigned long event_count;
57 unsigned long active_count;
58 unsigned long relax_count;
59 unsigned long expire_count;
60 unsigned long wakeup_count;
61 struct device *dev;
62 bool active:1;
63 bool autosleep_enabled:1;
64};
65
66#define for_each_wakeup_source(ws) \
67 for ((ws) = wakeup_sources_walk_start(); \
68 (ws); \
69 (ws) = wakeup_sources_walk_next((ws)))
70
71#ifdef CONFIG_PM_SLEEP
72
73/*
74 * Changes to device_may_wakeup take effect on the next pm state change.
75 */
76
77static inline bool device_can_wakeup(struct device *dev)
78{
79 return dev->power.can_wakeup;
80}
81
82static inline bool device_may_wakeup(struct device *dev)
83{
84 return dev->power.can_wakeup && !!dev->power.wakeup;
85}
86
87static inline bool device_wakeup_path(struct device *dev)
88{
89 return dev->power.wakeup_path;
90}
91
92static inline void device_set_wakeup_path(struct device *dev)
93{
94 dev->power.wakeup_path = true;
95}
96
97/* drivers/base/power/wakeup.c */
98extern struct wakeup_source *wakeup_source_register(struct device *dev,
99 const char *name);
100extern void wakeup_source_unregister(struct wakeup_source *ws);
101extern int wakeup_sources_read_lock(void);
102extern void wakeup_sources_read_unlock(int idx);
103extern struct wakeup_source *wakeup_sources_walk_start(void);
104extern struct wakeup_source *wakeup_sources_walk_next(struct wakeup_source *ws);
105extern int device_wakeup_enable(struct device *dev);
106extern void device_wakeup_disable(struct device *dev);
107extern void device_set_wakeup_capable(struct device *dev, bool capable);
108extern int device_set_wakeup_enable(struct device *dev, bool enable);
109extern void __pm_stay_awake(struct wakeup_source *ws);
110extern void pm_stay_awake(struct device *dev);
111extern void __pm_relax(struct wakeup_source *ws);
112extern void pm_relax(struct device *dev);
113extern void pm_wakeup_ws_event(struct wakeup_source *ws, unsigned int msec, bool hard);
114extern void pm_wakeup_dev_event(struct device *dev, unsigned int msec, bool hard);
115
116#else /* !CONFIG_PM_SLEEP */
117
118static inline void device_set_wakeup_capable(struct device *dev, bool capable)
119{
120 dev->power.can_wakeup = capable;
121}
122
123static inline bool device_can_wakeup(struct device *dev)
124{
125 return dev->power.can_wakeup;
126}
127
128static inline struct wakeup_source *wakeup_source_register(struct device *dev,
129 const char *name)
130{
131 return NULL;
132}
133
134static inline void wakeup_source_unregister(struct wakeup_source *ws) {}
135
136static inline int device_wakeup_enable(struct device *dev)
137{
138 dev->power.should_wakeup = true;
139 return 0;
140}
141
142static inline void device_wakeup_disable(struct device *dev)
143{
144 dev->power.should_wakeup = false;
145}
146
147static inline int device_set_wakeup_enable(struct device *dev, bool enable)
148{
149 dev->power.should_wakeup = enable;
150 return 0;
151}
152
153static inline bool device_may_wakeup(struct device *dev)
154{
155 return dev->power.can_wakeup && dev->power.should_wakeup;
156}
157
158static inline bool device_wakeup_path(struct device *dev)
159{
160 return false;
161}
162
163static inline void device_set_wakeup_path(struct device *dev) {}
164
165static inline void __pm_stay_awake(struct wakeup_source *ws) {}
166
167static inline void pm_stay_awake(struct device *dev) {}
168
169static inline void __pm_relax(struct wakeup_source *ws) {}
170
171static inline void pm_relax(struct device *dev) {}
172
173static inline void pm_wakeup_ws_event(struct wakeup_source *ws,
174 unsigned int msec, bool hard) {}
175
176static inline void pm_wakeup_dev_event(struct device *dev, unsigned int msec,
177 bool hard) {}
178
179#endif /* !CONFIG_PM_SLEEP */
180
181static inline bool device_awake_path(struct device *dev)
182{
183 return device_wakeup_path(dev);
184}
185
186static inline void device_set_awake_path(struct device *dev)
187{
188 device_set_wakeup_path(dev);
189}
190
191static inline void __pm_wakeup_event(struct wakeup_source *ws, unsigned int msec)
192{
193 pm_wakeup_ws_event(ws, msec, false);
194}
195
196static inline void pm_wakeup_event(struct device *dev, unsigned int msec)
197{
198 pm_wakeup_dev_event(dev, msec, false);
199}
200
201static inline void pm_wakeup_hard_event(struct device *dev)
202{
203 pm_wakeup_dev_event(dev, 0, true);
204}
205
206/**
207 * device_init_wakeup - Device wakeup initialization.
208 * @dev: Device to handle.
209 * @enable: Whether or not to enable @dev as a wakeup device.
210 *
211 * By default, most devices should leave wakeup disabled. The exceptions are
212 * devices that everyone expects to be wakeup sources: keyboards, power buttons,
213 * possibly network interfaces, etc. Also, devices that don't generate their
214 * own wakeup requests but merely forward requests from one bus to another
215 * (like PCI bridges) should have wakeup enabled by default.
216 */
217static inline int device_init_wakeup(struct device *dev, bool enable)
218{
219 if (enable) {
220 device_set_wakeup_capable(dev, true);
221 return device_wakeup_enable(dev);
222 }
223 device_wakeup_disable(dev);
224 device_set_wakeup_capable(dev, false);
225 return 0;
226}
227
228static void device_disable_wakeup(void *dev)
229{
230 device_init_wakeup(dev, false);
231}
232
233/**
234 * devm_device_init_wakeup - Resource managed device wakeup initialization.
235 * @dev: Device to handle.
236 *
237 * This function is the devm managed version of device_init_wakeup(dev, true).
238 */
239static inline int devm_device_init_wakeup(struct device *dev)
240{
241 device_init_wakeup(dev, true);
242 return devm_add_action_or_reset(dev, device_disable_wakeup, dev);
243}
244
245#endif /* _LINUX_PM_WAKEUP_H */