1/* drivers/staging/dream/include/linux/wakelock.h 2 * 3 * Copyright (C) 2007-2008 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/list.h> 20#include <linux/ktime.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. If the type is WAKE_LOCK_IDLE, low power 25 * states that cause large interrupt latencies or that disable a set of 26 * interrupts will not entered from idle until the wake_locks are released. 27 */ 28 29enum { 30 WAKE_LOCK_SUSPEND, /* Prevent suspend */ 31 WAKE_LOCK_IDLE, /* Prevent low power idle */ 32 WAKE_LOCK_TYPE_COUNT 33}; 34 35struct wake_lock { 36#ifdef CONFIG_HAS_WAKELOCK 37 struct list_head link; 38 int flags; 39 const char *name; 40 unsigned long expires; 41#ifdef CONFIG_WAKELOCK_STAT 42 struct { 43 int count; 44 int expire_count; 45 int wakeup_count; 46 ktime_t total_time; 47 ktime_t prevent_suspend_time; 48 ktime_t max_time; 49 ktime_t last_time; 50 } stat; 51#endif 52#endif 53}; 54 55#ifdef CONFIG_HAS_WAKELOCK 56 57void wake_lock_init(struct wake_lock *lock, int type, const char *name); 58void wake_lock_destroy(struct wake_lock *lock); 59void wake_lock(struct wake_lock *lock); 60void wake_lock_timeout(struct wake_lock *lock, long timeout); 61void wake_unlock(struct wake_lock *lock); 62 63/* wake_lock_active returns a non-zero value if the wake_lock is currently 64 * locked. If the wake_lock has a timeout, it does not check the timeout 65 * but if the timeout had aready been checked it will return 0. 66 */ 67int wake_lock_active(struct wake_lock *lock); 68 69/* has_wake_lock returns 0 if no wake locks of the specified type are active, 70 * and non-zero if one or more wake locks are held. Specifically it returns 71 * -1 if one or more wake locks with no timeout are active or the 72 * number of jiffies until all active wake locks time out. 73 */ 74long has_wake_lock(int type); 75 76#else 77 78static inline void wake_lock_init(struct wake_lock *lock, int type, 79 const char *name) {} 80static inline void wake_lock_destroy(struct wake_lock *lock) {} 81static inline void wake_lock(struct wake_lock *lock) {} 82static inline void wake_lock_timeout(struct wake_lock *lock, long timeout) {} 83static inline void wake_unlock(struct wake_lock *lock) {} 84 85static inline int wake_lock_active(struct wake_lock *lock) { return 0; } 86static inline long has_wake_lock(int type) { return 0; } 87 88#endif 89 90#endif 91