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/*
 *  pm.h - Power management interface
 *
 *  Copyright (C) 2000 Andrew Henroid
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef _LINUX_PM_H
#define _LINUX_PM_H

#include <linux/list.h>
#include <linux/workqueue.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/timer.h>
#include <linux/completion.h>

/*
 * Callbacks for platform drivers to implement.
 */
extern void (*pm_power_off)(void);
extern void (*pm_power_off_prepare)(void);

/*
 * Device power management
 */

struct device;

#ifdef CONFIG_PM
extern const char power_group_name[];		/* = "power" */
#else
#define power_group_name	NULL
#endif

typedef struct pm_message {
	int event;
} pm_message_t;

/**
 * struct dev_pm_ops - device PM callbacks
 *
 * Several device power state transitions are externally visible, affecting
 * the state of pending I/O queues and (for drivers that touch hardware)
 * interrupts, wakeups, DMA, and other hardware state.  There may also be
 * internal transitions to various low-power modes which are transparent
 * to the rest of the driver stack (such as a driver that's ON gating off
 * clocks which are not in active use).
 *
 * The externally visible transitions are handled with the help of callbacks
 * included in this structure in such a way that two levels of callbacks are
 * involved.  First, the PM core executes callbacks provided by PM domains,
 * device types, classes and bus types.  They are the subsystem-level callbacks
 * supposed to execute callbacks provided by device drivers, although they may
 * choose not to do that.  If the driver callbacks are executed, they have to
 * collaborate with the subsystem-level callbacks to achieve the goals
 * appropriate for the given system transition, given transition phase and the
 * subsystem the device belongs to.
 *
 * @prepare: The principal role of this callback is to prevent new children of
 *	the device from being registered after it has returned (the driver's
 *	subsystem and generally the rest of the kernel is supposed to prevent
 *	new calls to the probe method from being made too once @prepare() has
 *	succeeded).  If @prepare() detects a situation it cannot handle (e.g.
 *	registration of a child already in progress), it may return -EAGAIN, so
 *	that the PM core can execute it once again (e.g. after a new child has
 *	been registered) to recover from the race condition.
 *	This method is executed for all kinds of suspend transitions and is
 *	followed by one of the suspend callbacks: @suspend(), @freeze(), or
 *	@poweroff().  The PM core executes subsystem-level @prepare() for all
 *	devices before starting to invoke suspend callbacks for any of them, so
 *	generally devices may be assumed to be functional or to respond to
 *	runtime resume requests while @prepare() is being executed.  However,
 *	device drivers may NOT assume anything about the availability of user
 *	space at that time and it is NOT valid to request firmware from within
 *	@prepare() (it's too late to do that).  It also is NOT valid to allocate
 *	substantial amounts of memory from @prepare() in the GFP_KERNEL mode.
 *	[To work around these limitations, drivers may register suspend and
 *	hibernation notifiers to be executed before the freezing of tasks.]
 *
 * @complete: Undo the changes made by @prepare().  This method is executed for
 *	all kinds of resume transitions, following one of the resume callbacks:
 *	@resume(), @thaw(), @restore().  Also called if the state transition
 *	fails before the driver's suspend callback: @suspend(), @freeze() or