PM: Introduce generic prepare and complete callbacks for subsystems

Introduce generic .prepare() and .complete() power management
callbacks, currently missing, that can be used by subsystems and
power domains and export them.  Provide NULL definitions of all
the generic system sleep callbacks for CONFIG_PM_SLEEP unset.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

1 files changed, 19 insertions, 7 deletions

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 */