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