1*4882a593Smuzhiyun /* include/linux/wakelock.h
2*4882a593Smuzhiyun *
3*4882a593Smuzhiyun * Copyright (C) 2007-2012 Google, Inc.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * This software is licensed under the terms of the GNU General Public
6*4882a593Smuzhiyun * License version 2, as published by the Free Software Foundation, and
7*4882a593Smuzhiyun * may be copied, distributed, and modified under those terms.
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun * This program is distributed in the hope that it will be useful,
10*4882a593Smuzhiyun * but WITHOUT ANY WARRANTY; without even the implied warranty of
11*4882a593Smuzhiyun * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12*4882a593Smuzhiyun * GNU General Public License for more details.
13*4882a593Smuzhiyun *
14*4882a593Smuzhiyun */
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #ifndef _LINUX_WAKELOCK_H
17*4882a593Smuzhiyun #define _LINUX_WAKELOCK_H
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #include <linux/ktime.h>
20*4882a593Smuzhiyun #include <linux/device.h>
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun /* A wake_lock prevents the system from entering suspend or other low power
23*4882a593Smuzhiyun * states when active. If the type is set to WAKE_LOCK_SUSPEND, the wake_lock
24*4882a593Smuzhiyun * prevents a full system suspend.
25*4882a593Smuzhiyun */
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun enum {
28*4882a593Smuzhiyun WAKE_LOCK_SUSPEND, /* Prevent suspend */
29*4882a593Smuzhiyun WAKE_LOCK_TYPE_COUNT
30*4882a593Smuzhiyun };
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun struct wake_lock {
33*4882a593Smuzhiyun struct wakeup_source ws;
34*4882a593Smuzhiyun };
35*4882a593Smuzhiyun
wake_lock_init(struct wake_lock * lock,int type,const char * name)36*4882a593Smuzhiyun static inline void wake_lock_init(struct wake_lock *lock, int type,
37*4882a593Smuzhiyun const char *name)
38*4882a593Smuzhiyun {
39*4882a593Smuzhiyun struct wakeup_source *ws = &lock->ws;
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun if (ws) {
42*4882a593Smuzhiyun memset(ws, 0, sizeof(*ws));
43*4882a593Smuzhiyun ws->name = name;
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun wakeup_source_add(ws);
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun
wake_lock_destroy(struct wake_lock * lock)48*4882a593Smuzhiyun static inline void wake_lock_destroy(struct wake_lock *lock)
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun struct wakeup_source *ws = &lock->ws;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun wakeup_source_remove(ws);
53*4882a593Smuzhiyun __pm_relax(ws);
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
wake_lock(struct wake_lock * lock)56*4882a593Smuzhiyun static inline void wake_lock(struct wake_lock *lock)
57*4882a593Smuzhiyun {
58*4882a593Smuzhiyun __pm_stay_awake(&lock->ws);
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
wake_lock_timeout(struct wake_lock * lock,long timeout)61*4882a593Smuzhiyun static inline void wake_lock_timeout(struct wake_lock *lock, long timeout)
62*4882a593Smuzhiyun {
63*4882a593Smuzhiyun __pm_wakeup_event(&lock->ws, jiffies_to_msecs(timeout));
64*4882a593Smuzhiyun }
65*4882a593Smuzhiyun
wake_unlock(struct wake_lock * lock)66*4882a593Smuzhiyun static inline void wake_unlock(struct wake_lock *lock)
67*4882a593Smuzhiyun {
68*4882a593Smuzhiyun __pm_relax(&lock->ws);
69*4882a593Smuzhiyun }
70*4882a593Smuzhiyun
wake_lock_active(struct wake_lock * lock)71*4882a593Smuzhiyun static inline int wake_lock_active(struct wake_lock *lock)
72*4882a593Smuzhiyun {
73*4882a593Smuzhiyun return lock->ws.active;
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun #endif
77