1 /* include/linux/wakelock.h
2 *
3 * Copyright (C) 2007-2012 Google, Inc.
4 *
5 * This software is licensed under the terms of the GNU General Public
6 * License version 2, as published by the Free Software Foundation, and
7 * may be copied, distributed, and modified under those terms.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 */
15
16 #ifndef _LINUX_WAKELOCK_H
17 #define _LINUX_WAKELOCK_H
18
19 #include <linux/ktime.h>
20 #include <linux/device.h>
21
22 /* A wake_lock prevents the system from entering suspend or other low power
23 * states when active. If the type is set to WAKE_LOCK_SUSPEND, the wake_lock
24 * prevents a full system suspend.
25 */
26
27 enum {
28 WAKE_LOCK_SUSPEND, /* Prevent suspend */
29 WAKE_LOCK_TYPE_COUNT
30 };
31
32 struct wake_lock {
33 struct wakeup_source ws;
34 };
35
wake_lock_init(struct wake_lock * lock,int type,const char * name)36 static inline void wake_lock_init(struct wake_lock *lock, int type,
37 const char *name)
38 {
39 struct wakeup_source *ws = &lock->ws;
40
41 if (ws) {
42 memset(ws, 0, sizeof(*ws));
43 ws->name = name;
44 }
45 wakeup_source_add(ws);
46 }
47
wake_lock_destroy(struct wake_lock * lock)48 static inline void wake_lock_destroy(struct wake_lock *lock)
49 {
50 struct wakeup_source *ws = &lock->ws;
51
52 wakeup_source_remove(ws);
53 __pm_relax(ws);
54 }
55
wake_lock(struct wake_lock * lock)56 static inline void wake_lock(struct wake_lock *lock)
57 {
58 __pm_stay_awake(&lock->ws);
59 }
60
wake_lock_timeout(struct wake_lock * lock,long timeout)61 static inline void wake_lock_timeout(struct wake_lock *lock, long timeout)
62 {
63 __pm_wakeup_event(&lock->ws, jiffies_to_msecs(timeout));
64 }
65
wake_unlock(struct wake_lock * lock)66 static inline void wake_unlock(struct wake_lock *lock)
67 {
68 __pm_relax(&lock->ws);
69 }
70
wake_lock_active(struct wake_lock * lock)71 static inline int wake_lock_active(struct wake_lock *lock)
72 {
73 return lock->ws.active;
74 }
75
76 #endif
77