zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/drivers/scsi/scsi_pm.c b/ap/os/linux/linux-3.4.x/drivers/scsi/scsi_pm.c
new file mode 100644
index 0000000..c467064
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/scsi/scsi_pm.c
@@ -0,0 +1,246 @@
+/*
+ * 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 <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)) {
+ /*
+ * sd is the only high-level SCSI driver to implement runtime
+ * PM, and sd treats runtime suspend, system suspend, and
+ * system hibernate identically (but not system freeze).
+ */
+ if (pm_runtime_suspended(dev)) {
+ if (msg.event == PM_EVENT_SUSPEND ||
+ msg.event == PM_EVENT_HIBERNATE)
+ return 0; /* already suspended */
+
+ /* wake up device so that FREEZE will succeed */
+ pm_runtime_resume(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)) {
+ /*
+ * Parent device may have runtime suspended as soon as
+ * it is woken up during the system resume.
+ *
+ * Resume it on behalf of child.
+ */
+ pm_runtime_get_sync(dev->parent);
+ err = scsi_dev_type_resume(dev);
+ pm_runtime_put_sync(dev->parent);
+ }
+
+ if (err == 0) {
+ pm_runtime_disable(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+ }
+ return err;
+}
+
+static int scsi_bus_prepare(struct device *dev)
+{
+ if (scsi_is_sdev_device(dev)) {
+ /* sd probing uses async_schedule. Wait until it finishes. */
+ async_synchronize_full();
+
+ } else if (scsi_is_host_device(dev)) {
+ /* Wait until async scanning is finished */
+ scsi_complete_async_scans();
+ }
+ return 0;
+}
+
+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_prepare NULL
+#define scsi_bus_suspend NULL
+#define scsi_bus_freeze NULL
+#define scsi_bus_poweroff NULL
+
+#endif /* CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_PM_RUNTIME
+
+static int scsi_runtime_suspend(struct device *dev)
+{
+ int err = 0;
+
+ dev_dbg(dev, "scsi_runtime_suspend\n");
+ if (scsi_is_sdev_device(dev)) {
+ err = scsi_dev_type_suspend(dev, PMSG_AUTO_SUSPEND);
+ if (err == -EAGAIN)
+ pm_schedule_suspend(dev, jiffies_to_msecs(
+ round_jiffies_up_relative(HZ/10)));
+ }
+
+ /* Insert hooks here for targets, hosts, and transport classes */
+
+ return err;
+}
+
+static int scsi_runtime_resume(struct device *dev)
+{
+ int err = 0;
+
+ dev_dbg(dev, "scsi_runtime_resume\n");
+ if (scsi_is_sdev_device(dev))
+ err = scsi_dev_type_resume(dev);
+
+ /* Insert hooks here for targets, hosts, and transport classes */
+
+ return err;
+}
+
+static int scsi_runtime_idle(struct device *dev)
+{
+ int err;
+
+ dev_dbg(dev, "scsi_runtime_idle\n");
+
+ /* Insert hooks here for targets, hosts, and transport classes */
+
+ if (scsi_is_sdev_device(dev))
+ err = pm_schedule_suspend(dev, 100);
+ else
+ err = pm_runtime_suspend(dev);
+ return err;
+}
+
+int scsi_autopm_get_device(struct scsi_device *sdev)
+{
+ int err;
+
+ err = pm_runtime_get_sync(&sdev->sdev_gendev);
+ if (err < 0 && err !=-EACCES)
+ pm_runtime_put_sync(&sdev->sdev_gendev);
+ else
+ err = 0;
+ return err;
+}
+EXPORT_SYMBOL_GPL(scsi_autopm_get_device);
+
+void scsi_autopm_put_device(struct scsi_device *sdev)
+{
+ pm_runtime_put_sync(&sdev->sdev_gendev);
+}
+EXPORT_SYMBOL_GPL(scsi_autopm_put_device);
+
+void scsi_autopm_get_target(struct scsi_target *starget)
+{
+ pm_runtime_get_sync(&starget->dev);
+}
+
+void scsi_autopm_put_target(struct scsi_target *starget)
+{
+ pm_runtime_put_sync(&starget->dev);
+}
+
+int scsi_autopm_get_host(struct Scsi_Host *shost)
+{
+ int err;
+
+ err = pm_runtime_get_sync(&shost->shost_gendev);
+ if (err < 0 && err !=-EACCES)
+ pm_runtime_put_sync(&shost->shost_gendev);
+ else
+ err = 0;
+ return err;
+}
+
+void scsi_autopm_put_host(struct Scsi_Host *shost)
+{
+ pm_runtime_put_sync(&shost->shost_gendev);
+}
+
+#else
+
+#define scsi_runtime_suspend NULL
+#define scsi_runtime_resume NULL
+#define scsi_runtime_idle NULL
+
+#endif /* CONFIG_PM_RUNTIME */
+
+const struct dev_pm_ops scsi_bus_pm_ops = {
+ .prepare = scsi_bus_prepare,
+ .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,
+ .runtime_suspend = scsi_runtime_suspend,
+ .runtime_resume = scsi_runtime_resume,
+ .runtime_idle = scsi_runtime_idle,
+};