PM / Sleep: Add wake lock api wrapper on top of wakeup sources

Change-Id: Icaad02fe1e8856fdc2e4215f380594a5dde8e002
Signed-off-by: Arve Hjønnevåg <arve@android.com>
Git-commit: e9911f4efd
Git-repo: git://codeaurora.org/kernel/msm.git
[anursing@codeaurora.org: replace existing implementation, resolve
merge conflicts]
Signed-off-by: Anurag Singh <anursing@codeaurora.org>

include/linux/wakelock.h

@@ -1,6 +1,6 @@
 /* include/linux/wakelock.h
  *
- * Copyright (C) 2007-2008 Google, Inc.
+ * Copyright (C) 2007-2012 Google, Inc.
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
@@ -16,14 +16,12 @@
 #ifndef _LINUX_WAKELOCK_H
 #define _LINUX_WAKELOCK_H
 
-#include <linux/list.h>
 #include <linux/ktime.h>
+#include <linux/device.h>
 
 /* A wake_lock prevents the system from entering suspend or other low power
  * states when active. If the type is set to WAKE_LOCK_SUSPEND, the wake_lock
- * prevents a full system suspend. If the type is WAKE_LOCK_IDLE, low power
- * states that cause large interrupt latencies or that disable a set of
- * interrupts will not entered from idle until the wake_locks are released.
+ * prevents a full system suspend.
  */
 
 enum {
@@ -32,59 +30,38 @@ enum {
 };
 
 struct wake_lock {
-#ifdef CONFIG_HAS_WAKELOCK
-	struct list_head    link;
-	int                 flags;
-	const char         *name;
-	unsigned long       expires;
-#ifdef CONFIG_WAKELOCK_STAT
-	struct {
-		int             count;
-		int             expire_count;
-		int             wakeup_count;
-		ktime_t         total_time;
-		ktime_t         prevent_suspend_time;
-		ktime_t         max_time;
-		ktime_t         last_time;
-	} stat;
-#endif
-#endif
+	struct wakeup_source ws;
 };
 
-#ifdef CONFIG_HAS_WAKELOCK
-
-void wake_lock_init(struct wake_lock *lock, int type, const char *name);
-void wake_lock_destroy(struct wake_lock *lock);
-void wake_lock(struct wake_lock *lock);
-void wake_lock_timeout(struct wake_lock *lock, long timeout);
-void wake_unlock(struct wake_lock *lock);
-
-/* wake_lock_active returns a non-zero value if the wake_lock is currently
- * locked. If the wake_lock has a timeout, it does not check the timeout
- * but if the timeout had aready been checked it will return 0.
- */
-int wake_lock_active(struct wake_lock *lock);
-
-/* has_wake_lock returns 0 if no wake locks of the specified type are active,
- * and non-zero if one or more wake locks are held. Specifically it returns
- * -1 if one or more wake locks with no timeout are active or the
- * number of jiffies until all active wake locks time out.
- */
-long has_wake_lock(int type);
-
-#else
-
 static inline void wake_lock_init(struct wake_lock *lock, int type,
-					const char *name) {}
-static inline void wake_lock_destroy(struct wake_lock *lock) {}
-static inline void wake_lock(struct wake_lock *lock) {}
-static inline void wake_lock_timeout(struct wake_lock *lock, long timeout) {}
-static inline void wake_unlock(struct wake_lock *lock) {}
+				  const char *name)
+{
+	wakeup_source_init(&lock->ws, name);
+}
 
-static inline int wake_lock_active(struct wake_lock *lock) { return 0; }
-static inline long has_wake_lock(int type) { return 0; }
+static inline void wake_lock_destroy(struct wake_lock *lock)
+{
+	wakeup_source_trash(&lock->ws);
+}
+
+static inline void wake_lock(struct wake_lock *lock)
+{
+	__pm_stay_awake(&lock->ws);
+}
+
+static inline void wake_lock_timeout(struct wake_lock *lock, long timeout)
+{
+	__pm_wakeup_event(&lock->ws, jiffies_to_msecs(timeout));
+}
+
+static inline void wake_unlock(struct wake_lock *lock)
+{
+	__pm_relax(&lock->ws);
+}
+
+static inline int wake_lock_active(struct wake_lock *lock)
+{
+	return lock->ws.active;
+}
 
 #endif
-
-#endif
-

kernel/power/Kconfig

@@ -18,6 +18,14 @@ config SUSPEND_FREEZER
 
 	  Turning OFF this setting is NOT recommended! If in doubt, say Y.
 
+config HAS_WAKELOCK
+	bool
+	default y
+
+config WAKELOCK
+	bool
+	default y
+
 config HIBERNATE_CALLBACKS
 	bool