1 files changed, 96 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_pm.c b/drivers/scsi/scsi_pm.c
new file mode 100644
index 00000000000..cd83758ce0a
--- /dev/null
+++ b/drivers/scsi/scsi_pm.c
@@ -0,0 +1,96 @@
+/*
+ *	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,
+};