From badbd86df2a00fc8aeab05aa4059125fb0d9d575 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
Date: Fri, 26 Sep 2008 22:10:56 -0700
Subject: [PATCH] PM: Add wake lock api. (cherry picked from commit
 ec81142a98488552276a425d6363533368d02025)

Conflicts:

	include/linux/wakelock.h

Change-Id: I185d58274d2b1d69447981b669f5921c74f73a00
---
 include/linux/wakelock.h | 87 +++++++++++++++++++++++++---------------
 1 file changed, 55 insertions(+), 32 deletions(-)

diff --git a/include/linux/wakelock.h b/include/linux/wakelock.h
index f4a698a22880..5b2d0f348ac6 100644
--- a/include/linux/wakelock.h
+++ b/include/linux/wakelock.h
@@ -1,6 +1,6 @@
 /* include/linux/wakelock.h
  *
- * Copyright (C) 2007-2012 Google, Inc.
+ * Copyright (C) 2007-2008 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
@@ -16,12 +16,14 @@
 #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.
+ * 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.
  */
 
 enum {
@@ -30,38 +32,59 @@ enum {
 };
 
 struct wake_lock {
-	struct wakeup_source ws;
+#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
 };
 
+#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)
-{
-	wakeup_source_init(&lock->ws, name);
-}
+					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) {}
 
-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;
-}
+static inline int wake_lock_active(struct wake_lock *lock) { return 0; }
+static inline long has_wake_lock(int type) { return 0; }
 
 #endif
+
+#endif
+