97 строки
2.0 KiB
C
97 строки
2.0 KiB
C
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/*
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* scsi_pm.c Copyright (C) 2010 Alan Stern
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*
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* SCSI dynamic Power Management
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* Initial version: Alan Stern <stern@rowland.harvard.edu>
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*/
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#include <linux/pm_runtime.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_driver.h>
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#include <scsi/scsi_host.h>
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#include "scsi_priv.h"
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static int scsi_dev_type_suspend(struct device *dev, pm_message_t msg)
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{
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struct device_driver *drv;
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int err;
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err = scsi_device_quiesce(to_scsi_device(dev));
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if (err == 0) {
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drv = dev->driver;
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if (drv && drv->suspend)
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err = drv->suspend(dev, msg);
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}
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dev_dbg(dev, "scsi suspend: %d\n", err);
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return err;
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}
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static int scsi_dev_type_resume(struct device *dev)
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{
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struct device_driver *drv;
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int err = 0;
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drv = dev->driver;
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if (drv && drv->resume)
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err = drv->resume(dev);
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scsi_device_resume(to_scsi_device(dev));
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dev_dbg(dev, "scsi resume: %d\n", err);
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return err;
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}
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#ifdef CONFIG_PM_SLEEP
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static int scsi_bus_suspend_common(struct device *dev, pm_message_t msg)
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{
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int err = 0;
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if (scsi_is_sdev_device(dev))
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err = scsi_dev_type_suspend(dev, msg);
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return err;
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}
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static int scsi_bus_resume_common(struct device *dev)
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{
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int err = 0;
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if (scsi_is_sdev_device(dev))
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err = scsi_dev_type_resume(dev);
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return err;
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}
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static int scsi_bus_suspend(struct device *dev)
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{
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return scsi_bus_suspend_common(dev, PMSG_SUSPEND);
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}
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static int scsi_bus_freeze(struct device *dev)
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{
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return scsi_bus_suspend_common(dev, PMSG_FREEZE);
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}
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static int scsi_bus_poweroff(struct device *dev)
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{
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return scsi_bus_suspend_common(dev, PMSG_HIBERNATE);
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}
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#else /* CONFIG_PM_SLEEP */
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#define scsi_bus_resume_common NULL
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#define scsi_bus_suspend NULL
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#define scsi_bus_freeze NULL
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#define scsi_bus_poweroff NULL
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#endif /* CONFIG_PM_SLEEP */
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const struct dev_pm_ops scsi_bus_pm_ops = {
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.suspend = scsi_bus_suspend,
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.resume = scsi_bus_resume_common,
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.freeze = scsi_bus_freeze,
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.thaw = scsi_bus_resume_common,
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.poweroff = scsi_bus_poweroff,
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.restore = scsi_bus_resume_common,
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};
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