---

yaml
---
r: 256916
b: refs/heads/master
c: 3b5fe85
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 99f381d3549432a250fe846a2a82d61a032804b0
+refs/heads/master: 3b5fe85252326217cd96f24a7bda4460d8f71bee

trunk/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);
 };

trunk/kernel/power/suspend.c

@@ -126,12 +126,13 @@ void __attribute__ ((weak)) arch_suspend_enable_irqs(void)
 }
 
 /**
- *	suspend_enter - enter the desired system sleep state.
- *	@state:		state to enter
+ * suspend_enter - enter the desired system sleep state.
+ * @state: State to enter
+ * @wakeup: Returns information that suspend should not be entered again.
  *
- *	This function should be called after devices have been suspended.
+ * This function should be called after devices have been suspended.
  */
-static int suspend_enter(suspend_state_t state)
+static int suspend_enter(suspend_state_t state, bool *wakeup)
 {
 	int error;
 
@@ -165,7 +166,8 @@ static int suspend_enter(suspend_state_t state)
 
 	error = syscore_suspend();
 	if (!error) {
-		if (!(suspend_test(TEST_CORE) || pm_wakeup_pending())) {
+		*wakeup = pm_wakeup_pending();
+		if (!(suspend_test(TEST_CORE) || *wakeup)) {
 			error = suspend_ops->enter(state);
 			events_check_enabled = false;
 		}
@@ -199,6 +201,7 @@ static int suspend_enter(suspend_state_t state)
 int suspend_devices_and_enter(suspend_state_t state)
 {
 	int error;
+	bool wakeup = false;
 
 	if (!suspend_ops)
 		return -ENOSYS;
@@ -220,7 +223,10 @@ int suspend_devices_and_enter(suspend_state_t state)
 	if (suspend_test(TEST_DEVICES))
 		goto Recover_platform;
 
-	error = suspend_enter(state);
+	do {
+		error = suspend_enter(state, &wakeup);
+	} while (!error && !wakeup
+		&& suspend_ops->suspend_again && suspend_ops->suspend_again());
 
  Resume_devices:
 	suspend_test_start();