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/* include/linux/wakelock.h
*
* Copyright (C) 2007-2008 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#ifndef _LINUX_WAKELOCK_H
#define _LINUX_WAKELOCK_H
#include <linux/list.h>
#include <linux/ktime.h>
/* A wake_lock prevents the system from entering suspend or other low power
* states when active. If the type is set to WAKE_LOCK_SUSPEND, the wake_lock
* prevents a full system suspend. If the type is WAKE_LOCK_IDLE, low power
* states that cause large interrupt latencies or that disable a set of
* interrupts will not entered from idle until the wake_locks are released.
*/
enum {
WAKE_LOCK_SUSPEND, /* Prevent suspend */
WAKE_LOCK_IDLE, /* Prevent low power idle */
WAKE_LOCK_TYPE_COUNT
};
struct wake_lock {
#ifdef CONFIG_HAS_WAKELOCK
struct list_head link;
int flags;
const char *name;
unsigned long expires;
#ifdef CONFIG_WAKELOCK_STAT
struct {
int count;
int expire_count;
int wakeup_count;
ktime_t total_time;
ktime_t prevent_suspend_time;
ktime_t max_time;
ktime_t last_time;
} stat;
#endif
#endif
};
#ifdef CONFIG_HAS_WAKELOCK
void wake_lock_init(struct wake_lock *lock, int type, const char *name);
void wake_lock_destroy(struct wake_lock *lock);
void wake_lock(struct wake_lock *lock);
void wake_lock_timeout(struct wake_lock *lock, long timeout);
void wake_unlock(struct wake_lock *lock);
/* wake_lock_active returns a non-zero value if the wake_lock is currently
* locked. If the wake_lock has a timeout, it does not check the timeout
* but if the timeout had aready been checked it will return 0.
*/
int wake_lock_active(struct wake_lock *lock);
/* has_wake_lock returns 0 if no wake locks of the specified type are active,
* and non-zero if one or more wake locks are held. Specifically it returns
* -1 if one or more wake locks with no timeout are active or the
* number of jiffies until all active wake locks time out.
*/
long has_wake_lock(int type);
#else
static inline void wake_lock_init(struct wake_lock *lock, int type,
const char *name) {}
static inline void wake_lock_destroy(struct wake_lock *lock) {}
static inline void wake_lock(struct wake_lock *lock) {}
static inline void wake_lock_timeout(struct wake_lock *lock, long timeout) {}
static inline void wake_unlock(struct wake_lock *lock) {}
static inline int wake_lock_active(struct wake_lock *lock) { return 0; }
static inline long has_wake_lock(int type) { return 0; }
#endif
#endif
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