PM / Sleep: Add wake lock api wrapper on top of wakeup sources

/* include/linux/wakelock.h

 *

 * Copyright (C) 2007-2012 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/ktime.h>

#include <linux/device.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.

 */

enum {

	WAKE_LOCK_SUSPEND, /* Prevent suspend */

	WAKE_LOCK_TYPE_COUNT

};

struct wake_lock {

	struct wakeup_source ws;

};

static inline void wake_lock_init(struct wake_lock *lock, int type,

				  const char *name)

{

	wakeup_source_init(&lock->ws, name);

}

static inline void wake_lock_destroy(struct wake_lock *lock)

{

	wakeup_source_trash(&lock->ws);

}

static inline void wake_lock(struct wake_lock *lock)

{

	__pm_stay_awake(&lock->ws);

}

static inline void wake_lock_timeout(struct wake_lock *lock, long timeout)

{

	__pm_wakeup_event(&lock->ws, jiffies_to_msecs(timeout));

}

static inline void wake_unlock(struct wake_lock *lock)

{

	__pm_relax(&lock->ws);

}

static inline int wake_lock_active(struct wake_lock *lock)

{

	return lock->ws.active;

}

#endif

	  of suspend, or they are content with invoking sync() from

	  user-space before invoking suspend.  Say Y if that's your case.

config WAKELOCK

	bool

	default y

config HIBERNATE_CALLBACKS

	bool