linux-imx

/*

 *  scsi_pm.c   Copyright (C) 2010 Alan Stern

 *

 *  SCSI dynamic Power Management

 *      Initial version: Alan Stern <stern@rowland.harvard.edu>

 */

​

#include <linux/pm_runtime.h>

#include <linux/export.h>

#include <linux/async.h>

#include <linux/blk-pm.h>

​

#include <scsi/scsi.h>

#include <scsi/scsi_device.h>

#include <scsi/scsi_driver.h>

#include <scsi/scsi_host.h>

​

#include "scsi_priv.h"

​

#ifdef CONFIG_PM_SLEEP

​

static int do_scsi_suspend(struct device *dev, const struct dev_pm_ops *pm)

{

    return pm && pm->suspend ? pm->suspend(dev) : 0;

}

​

static int do_scsi_freeze(struct device *dev, const struct dev_pm_ops *pm)

{

    return pm && pm->freeze ? pm->freeze(dev) : 0;

}

​

static int do_scsi_poweroff(struct device *dev, const struct dev_pm_ops *pm)

{

    return pm && pm->poweroff ? pm->poweroff(dev) : 0;

}

​

static int do_scsi_resume(struct device *dev, const struct dev_pm_ops *pm)

{

    return pm && pm->resume ? pm->resume(dev) : 0;

}

​

static int do_scsi_thaw(struct device *dev, const struct dev_pm_ops *pm)

{

    return pm && pm->thaw ? pm->thaw(dev) : 0;

}

​

static int do_scsi_restore(struct device *dev, const struct dev_pm_ops *pm)

{

    return pm && pm->restore ? pm->restore(dev) : 0;

}

​

static int scsi_dev_type_suspend(struct device *dev,

        int (*cb)(struct device *, const struct dev_pm_ops *))

{

    const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;

    int err;

​

    /* flush pending in-flight resume operations, suspend is synchronous */

    async_synchronize_full_domain(&scsi_sd_pm_domain);

​

    err = scsi_device_quiesce(to_scsi_device(dev));

    if (err == 0) {

        err = cb(dev, pm);