1 files changed, 16 insertions, 0 deletions

diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 083ffea7ba18..6bbcef22e105 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -92,6 +92,13 @@ typedef int __bitwise suspend_state_t;
  *      @enter() and @wake(), even if any of them fails.  It is executed after
  *      a failing @prepare.
  *
+ * @suspend_again: Returns whether the system should suspend again (true) or
+ *      not (false). If the platform wants to poll sensors or execute some
+ *      code during suspended without invoking userspace and most of devices,
+ *      suspend_again callback is the place assuming that periodic-wakeup or
+ *      alarm-wakeup is already setup. This allows to execute some codes while
+ *      being kept suspended in the view of userland and devices.
+ *
  * @end: Called by the PM core right after resuming devices, to indicate to
  *      the platform that the system has returned to the working state or
  *      the transition to the sleep state has been aborted.
@@ -113,6 +120,7 @@ struct platform_suspend_ops {
         int (*enter)(suspend_state_t state);
         void (*wake)(void);
         void (*finish)(void);
+        bool (*suspend_again)(void);
         void (*end)(void);
         void (*recover)(void);
 };
@@ -260,6 +268,14 @@ static inline int hibernate(void) { return -ENOSYS; }
 static inline bool system_entering_hibernation(void) { return false; }
 #endif /* CONFIG_HIBERNATION */
 
+/* Hibernation and suspend events */
+#define PM_HIBERNATION_PREPARE  0x0001 /* Going to hibernate */
+#define PM_POST_HIBERNATION     0x0002 /* Hibernation finished */
+#define PM_SUSPEND_PREPARE      0x0003 /* Going to suspend the system */
+#define PM_POST_SUSPEND         0x0004 /* Suspend finished */
+#define PM_RESTORE_PREPARE      0x0005 /* Going to restore a saved image */
+#define PM_POST_RESTORE         0x0006 /* Restore failed */
+
 #ifdef CONFIG_PM_SLEEP
 void save_processor_state(void);
 void restore_processor_state(void);