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/*
* 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 <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_driver.h>
#include <scsi/scsi_host.h>
#include "scsi_priv.h"
static int scsi_dev_type_suspend(struct device *dev, pm_message_t msg)
{
struct device_driver *drv;
int err;
err = scsi_device_quiesce(to_scsi_device(dev));
if (err == 0) {
drv = dev->driver;
if (drv && drv->suspend)
err = drv->suspend(dev, msg);
}
dev_dbg(dev, "scsi suspend: %d\n", err);
return err;
}
static int scsi_dev_type_resume(struct device *dev)
{
struct device_driver *drv;
int err = 0;
drv = dev->driver;
if (drv && drv->resume)
err = drv->resume(dev);
scsi_device_resume(to_scsi_device(dev));
dev_dbg(dev, "scsi resume: %d\n", err);
return err;
}
#ifdef CONFIG_PM_SLEEP
static int scsi_bus_suspend_common(struct device *dev, pm_message_t msg)
{
int err = 0;
if (scsi_is_sdev_device(dev))
err = scsi_dev_type_suspend(dev, msg);
return err;
}
static int scsi_bus_resume_common(struct device *dev)
{
int err = 0;
if (scsi_is_sdev_device(dev))
err = scsi_dev_type_resume(dev);
return err;
}
static int scsi_bus_suspend(struct device *dev)
{
return scsi_bus_suspend_common(dev, PMSG_SUSPEND);
}
static int scsi_bus_freeze(struct device *dev)
{
return scsi_bus_suspend_common(dev, PMSG_FREEZE);
}
static int scsi_bus_poweroff(struct device *dev)
{
return scsi_bus_suspend_common(dev, PMSG_HIBERNATE);
}
#else /* CONFIG_PM_SLEEP */
#define scsi_bus_resume_common NULL
#define scsi_bus_suspend NULL
#define scsi_bus_freeze NULL
#define scsi_bus_poweroff NULL
#endif /* CONFIG_PM_SLEEP */
const struct dev_pm_ops scsi_bus_pm_ops = {
.suspend = scsi_bus_suspend,
.resume = scsi_bus_resume_common,
.freeze = scsi_bus_freeze,
.thaw = scsi_bus_resume_common,
.poweroff = scsi_bus_poweroff,
.restore = scsi_bus_resume_common,
};
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