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/* include/linux/suspend_blocker.h
*
* Copyright (C) 2007-2010 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_SUSPEND_BLOCKER_H
#define _LINUX_SUSPEND_BLOCKER_H
#include <linux/list.h>
#include <linux/ktime.h>
#include <linux/workqueue.h>
/**
* struct suspend_blocker_stats - statistics for a suspend blocker
*
* @count: Number of times this blocker has been deacivated.
* @wakeup_count: Number of times this blocker was the first to block suspend
* after resume.
* @total_time: Total time this suspend blocker has prevented suspend.
* @prevent_suspend_time: Time this suspend blocker has prevented suspend while
* user-space requested suspend.
* @max_time: Max time this suspend blocker has been continuously active.
* @last_time: Monotonic clock when the active state last changed.
*/
struct suspend_blocker_stats {
#ifdef CONFIG_SUSPEND_BLOCKER_STATS
unsigned int count;
unsigned int wakeup_count;
ktime_t total_time;
ktime_t prevent_suspend_time;
ktime_t max_time;
ktime_t last_time;
#endif
};
/**
* struct suspend_blocker - the basic suspend_blocker structure
* @link: List entry for active or inactive list.
* @flags: Tracks initialized and active state and statistics.
* @name: Suspend blocker name used for debugging.
*
* When a suspend_blocker is active it prevents the system from entering
* opportunistic suspend.
*
* The suspend_blocker structure must be initialized by suspend_blocker_init()
*/
struct suspend_blocker {
#ifdef CONFIG_OPPORTUNISTIC_SUSPEND
struct list_head link;
int flags;
const char *name;
struct suspend_blocker_stats stat;
#endif
};
/**
* struct suspend_blocking_work - the basic suspend_blocking_work structure
* @work: Standard work struct.
* @suspend_blocker: Suspend blocker.
* @func: Callback.
* @lock: Spinlock protecting pending and running state.
* @active: Number of cpu workqueues where work is pending or
* callback is running.
*
* When suspend blocking work is pending or its callback is running it prevents
* the system from entering opportunistic suspend.
*
* The suspend_blocking_work structure must be initialized by
* suspend_blocking_work_init().
*/
struct suspend_blocking_work {
struct work_struct work;
#ifdef CONFIG_OPPORTUNISTIC_SUSPEND
struct suspend_blocker suspend_blocker;
work_func_t func;
spinlock_t lock;
int active;
#endif
};
static inline struct suspend_blocking_work *to_suspend_blocking_work(
struct work_struct *work)
{
return container_of(work, struct suspend_blocking_work, work);
}
#ifdef CONFIG_OPPORTUNISTIC_SUSPEND
#define __SUSPEND_BLOCKER_INITIALIZER(blocker_name) \
{ .name = #blocker_name, }
#define DEFINE_SUSPEND_BLOCKER(blocker, name) \
struct suspend_blocker blocker = __SUSPEND_BLOCKER_INITIALIZER(name)
extern void suspend_blocker_register(struct suspend_blocker *blocker);
extern void suspend_blocker_init(struct suspend_blocker *blocker,
const char *name);
extern void suspend_blocker_unregister(struct suspend_blocker *blocker);
extern void suspend_block(struct suspend_blocker *blocker);
extern void suspend_unblock(struct suspend_blocker *blocker);
extern bool suspend_blocker_is_active(struct suspend_blocker *blocker);
extern bool suspend_is_blocked(void);
void suspend_blocking_work_init(struct suspend_blocking_work *work,
work_func_t func, const char *name);
void suspend_blocking_work_destroy(struct suspend_blocking_work *work);
int queue_suspend_blocking_work(struct workqueue_struct *wq,
struct suspend_blocking_work *work);
int schedule_suspend_blocking_work(struct suspend_blocking_work *work);
int cancel_suspend_blocking_work_sync(struct suspend_blocking_work *work);
#else
#define DEFINE_SUSPEND_BLOCKER(blocker, name) \
struct suspend_blocker blocker
static inline void suspend_blocker_register(struct suspend_blocker *bl) {}
static inline void suspend_blocker_init(struct suspend_blocker *bl,
const char *n) {}
static inline void suspend_blocker_unregister(struct suspend_blocker *bl) {}
static inline void suspend_block(struct suspend_blocker *bl) {}
static inline void suspend_unblock(struct suspend_blocker *bl) {}
static inline bool suspend_blocker_is_active(struct suspend_blocker *bl)
{
return false;
}
static inline bool suspend_is_blocked(void) { return false; }
static inline void suspend_blocking_work_init(
struct suspend_blocking_work *work, work_func_t func, const char *name)
{
INIT_WORK(&work->work, func);
}
static inline void suspend_blocking_work_destroy(
struct suspend_blocking_work *work)
{
cancel_work_sync(&work->work);
}
static inline int queue_suspend_blocking_work(
struct workqueue_struct *wq, struct suspend_blocking_work *work)
{
return queue_work(wq, &work->work);
}
static inline int schedule_suspend_blocking_work(
struct suspend_blocking_work *work)
{
return schedule_work(&work->work);
}
static inline int cancel_suspend_blocking_work_sync(
struct suspend_blocking_work *work)
{
return cancel_work_sync(&work->work);
}
#endif
#endif
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