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, const char *name)
37 {
38 struct wakeup_source *ws = &lock->ws;
39
40 if (ws) {
41 memset(ws, 0, sizeof(*ws));
42 ws->name = name;
43 }
44 wakeup_source_add(ws);
45 }
46
wake_lock_destroy(struct wake_lock * lock)47 static inline void wake_lock_destroy(struct wake_lock *lock)
48 {
49 struct wakeup_source *ws = &lock->ws;
50
51 wakeup_source_remove(ws);
52 __pm_relax(ws);
53 }
54
wake_lock(struct wake_lock * lock)55 static inline void wake_lock(struct wake_lock *lock)
56 {
57 __pm_stay_awake(&lock->ws);
58 }
59
wake_lock_timeout(struct wake_lock * lock,long timeout)60 static inline void wake_lock_timeout(struct wake_lock *lock, long timeout)
61 {
62 __pm_wakeup_event(&lock->ws, jiffies_to_msecs(timeout));
63 }
64
wake_unlock(struct wake_lock * lock)65 static inline void wake_unlock(struct wake_lock *lock)
66 {
67 __pm_relax(&lock->ws);
68 }
69
wake_lock_active(struct wake_lock * lock)70 static inline int wake_lock_active(struct wake_lock *lock)
71 {
72 return lock->ws.active;
73 }
74
75 #endif
76