[SCSI] convert to the new PM framework
This patch (as1397b) converts the SCSI midlayer to use the new PM
callbacks (struct dev_pm_ops). A new source file, scsi_pm.c, is
created to hold the new callback routines, and the existing
suspend/resume code is moved there.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/scsi/scsi_pm.c b/drivers/scsi/scsi_pm.c
new file mode 100644
index 0000000..cd83758
--- /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,
+};