2 files changed, 58 insertions, 7 deletions

diff --git a/drivers/base/power/generic_ops.c b/drivers/base/power/generic_ops.c
index 42f97f925629..cb3bb368681c 100644
--- a/drivers/base/power/generic_ops.c
+++ b/drivers/base/power/generic_ops.c
@@ -74,6 +74,23 @@ EXPORT_SYMBOL_GPL(pm_generic_runtime_resume);
 
 #ifdef CONFIG_PM_SLEEP
 /**
+ * pm_generic_prepare - Generic routine preparing a device for power transition.
+ * @dev: Device to prepare.
+ *
+ * Prepare a device for a system-wide power transition.
+ */
+int pm_generic_prepare(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+        int ret = 0;
+
+        if (drv && drv->pm && drv->pm->prepare)
+                ret = drv->pm->prepare(dev);
+
+        return ret;
+}
+
+/**
  * __pm_generic_call - Generic suspend/freeze/poweroff/thaw subsystem callback.
  * @dev: Device to handle.
  * @event: PM transition of the system under way.
@@ -213,16 +230,38 @@ int pm_generic_restore(struct device *dev)
         return __pm_generic_resume(dev, PM_EVENT_RESTORE);
 }
 EXPORT_SYMBOL_GPL(pm_generic_restore);
+
+/**
+ * pm_generic_complete - Generic routine competing a device power transition.
+ * @dev: Device to handle.
+ *
+ * Complete a device power transition during a system-wide power transition.
+ */
+void pm_generic_complete(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+
+        if (drv && drv->pm && drv->pm->complete)
+                drv->pm->complete(dev);
+
+        /*
+         * Let runtime PM try to suspend devices that haven't been in use before
+         * going into the system-wide sleep state we're resuming from.
+         */
+        pm_runtime_idle(dev);
+}
 #endif /* CONFIG_PM_SLEEP */
 
 struct dev_pm_ops generic_subsys_pm_ops = {
 #ifdef CONFIG_PM_SLEEP
+        .prepare = pm_generic_prepare,
         .suspend = pm_generic_suspend,
         .resume = pm_generic_resume,
         .freeze = pm_generic_freeze,
         .thaw = pm_generic_thaw,
         .poweroff = pm_generic_poweroff,
         .restore = pm_generic_restore,
+        .complete = pm_generic_complete,
 #endif
 #ifdef CONFIG_PM_RUNTIME
         .runtime_suspend = pm_generic_runtime_suspend,
diff --git a/include/linux/pm.h b/include/linux/pm.h
index dce7c7148771..3160648ccdda 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -550,6 +550,16 @@ extern void __suspend_report_result(const char *function, void *fn, int ret);
         } while (0)
 
 extern int device_pm_wait_for_dev(struct device *sub, struct device *dev);
+
+extern int pm_generic_prepare(struct device *dev);
+extern int pm_generic_suspend(struct device *dev);
+extern int pm_generic_resume(struct device *dev);
+extern int pm_generic_freeze(struct device *dev);
+extern int pm_generic_thaw(struct device *dev);
+extern int pm_generic_restore(struct device *dev);
+extern int pm_generic_poweroff(struct device *dev);
+extern void pm_generic_complete(struct device *dev);
+
 #else /* !CONFIG_PM_SLEEP */
 
 #define device_pm_lock() do {} while (0)
@@ -566,6 +576,15 @@ static inline int device_pm_wait_for_dev(struct device *a, struct device *b)
 {
         return 0;
 }
+
+#define pm_generic_prepare      NULL
+#define pm_generic_suspend      NULL
+#define pm_generic_resume       NULL
+#define pm_generic_freeze       NULL
+#define pm_generic_thaw         NULL
+#define pm_generic_restore      NULL
+#define pm_generic_poweroff     NULL
+#define pm_generic_complete     NULL
 #endif /* !CONFIG_PM_SLEEP */
 
 /* How to reorder dpm_list after device_move() */
@@ -576,11 +595,4 @@ enum dpm_order {
         DPM_ORDER_DEV_LAST,
 };
 
-extern int pm_generic_suspend(struct device *dev);
-extern int pm_generic_resume(struct device *dev);
-extern int pm_generic_freeze(struct device *dev);
-extern int pm_generic_thaw(struct device *dev);
-extern int pm_generic_restore(struct device *dev);
-extern int pm_generic_poweroff(struct device *dev);
-
 #endif /* _LINUX_PM_H */