linux-imx

/*

 * kernel/power/hibernate.c - Hibernation (a.k.a suspend-to-disk) support.

 *

 * Copyright (c) 2003 Patrick Mochel

 * Copyright (c) 2003 Open Source Development Lab

 * Copyright (c) 2004 Pavel Machek <pavel@ucw.cz>

 * Copyright (c) 2009 Rafael J. Wysocki, Novell Inc.

 * Copyright (C) 2012 Bojan Smojver <bojan@rexursive.com>

 *

 * This file is released under the GPLv2.

 */

​

#define pr_fmt(fmt) "PM: " fmt

​

#include <linux/export.h>

#include <linux/suspend.h>

#include <linux/syscalls.h>

#include <linux/reboot.h>

#include <linux/string.h>

#include <linux/device.h>

#include <linux/async.h>

#include <linux/delay.h>

#include <linux/fs.h>

#include <linux/mount.h>

#include <linux/pm.h>

#include <linux/nmi.h>

#include <linux/console.h>

#include <linux/cpu.h>

#include <linux/freezer.h>

#include <linux/gfp.h>

#include <linux/syscore_ops.h>

#include <linux/ctype.h>

#include <linux/genhd.h>

#include <linux/ktime.h>

#include <trace/events/power.h>

​

#include "power.h"

​

​

static int nocompress;

static int noresume;

static int nohibernate;

static int resume_wait;

static unsigned int resume_delay;

static char resume_file[256] = CONFIG_PM_STD_PARTITION;

dev_t swsusp_resume_device;

sector_t swsusp_resume_block;

__visible int in_suspend __nosavedata;

​

enum {

    HIBERNATION_INVALID,

    HIBERNATION_PLATFORM,

    HIBERNATION_SHUTDOWN,

    HIBERNATION_REBOOT,

#ifdef CONFIG_SUSPEND

    HIBERNATION_SUSPEND,

#endif

    HIBERNATION_TEST_RESUME,

    /* keep last */

    __HIBERNATION_AFTER_LAST

};

#define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)

#define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)

​

static int hibernation_mode = HIBERNATION_SHUTDOWN;

​

bool freezer_test_done;

​

static const struct platform_hibernation_ops *hibernation_ops;

​

bool hibernation_available(void)

{

    return (nohibernate == 0);

}

​

/**

 * hibernation_set_ops - Set the global hibernate operations.

 * @ops: Hibernation operations to use in subsequent hibernation transitions.

 */

void hibernation_set_ops(const struct platform_hibernation_ops *ops)

{

    if (ops && !(ops->begin && ops->end &&  ops->pre_snapshot

        && ops->prepare && ops->finish && ops->enter && ops->pre_restore

        && ops->restore_cleanup && ops->leave)) {

        WARN_ON(1);

        return;

    }

    lock_system_sleep();

    hibernation_ops = ops;

    if (ops)

        hibernation_mode = HIBERNATION_PLATFORM;

    else if (hibernation_mode == HIBERNATION_PLATFORM)