include/linux/wakelock.h

   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
  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
  42 static inline void wake_lock_destroy(struct wake_lock *lock)
  43 {
  44         wakeup_source_trash(&lock->ws);
  45 }
  46
  47 static inline void wake_lock(struct wake_lock *lock)
  48 {
  49         __pm_stay_awake(&lock->ws);
  50 }
  51
  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
  57 static inline void wake_unlock(struct wake_lock *lock)
  58 {
  59         __pm_relax(&lock->ws);
  60 }
  61
  62 static inline int wake_lock_active(struct wake_lock *lock)
  63 {
  64         return lock->ws.active;
  65 }
  66
  67 #endif