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 wakeup_source_init(&lock->ws, name);
40 }
41
wake_lock_destroy(struct wake_lock * lock)42 static inline void wake_lock_destroy(struct wake_lock *lock)
43 {
44 wakeup_source_trash(&lock->ws);
45 }
46
wake_lock(struct wake_lock * lock)47 static inline void wake_lock(struct wake_lock *lock)
48 {
49 __pm_stay_awake(&lock->ws);
50 }
51
wake_lock_timeout(struct wake_lock * lock,long timeout)52 static inline void wake_lock_timeout(struct wake_lock *lock, long timeout)
53 {
54 __pm_wakeup_event(&lock->ws, jiffies_to_msecs(timeout));
55 }
56
wake_unlock(struct wake_lock * lock)57 static inline void wake_unlock(struct wake_lock *lock)
58 {
59 __pm_relax(&lock->ws);
60 }
61
wake_lock_active(struct wake_lock * lock)62 static inline int wake_lock_active(struct wake_lock *lock)
63 {
64 return lock->ws.active;
65 }
66
67 #endif
68