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105 lines
3.4 KiB
Diff
105 lines
3.4 KiB
Diff
From e93bd714c424d9fe907cb1d8ec5ce784767a3b16 Mon Sep 17 00:00:00 2001
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From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
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Date: Fri, 26 Sep 2008 22:10:56 -0700
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Subject: [PATCH 064/134] PM: Add wake lock api.
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---
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include/linux/wakelock.h | 91 ++++++++++++++++++++++++++++++++++++++++++++++
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1 files changed, 91 insertions(+), 0 deletions(-)
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create mode 100755 include/linux/wakelock.h
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--- /dev/null
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+++ b/include/linux/wakelock.h
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@@ -0,0 +1,91 @@
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+/* include/linux/wakelock.h
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+ *
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+ * Copyright (C) 2007-2008 Google, Inc.
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+ *
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+ * This software is licensed under the terms of the GNU General Public
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+ * License version 2, as published by the Free Software Foundation, and
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+ * may be copied, distributed, and modified under those terms.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ */
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+
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+#ifndef _LINUX_WAKELOCK_H
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+#define _LINUX_WAKELOCK_H
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+
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+#include <linux/list.h>
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+#include <linux/ktime.h>
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+
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+/* A wake_lock prevents the system from entering suspend or other low power
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+ * states when active. If the type is set to WAKE_LOCK_SUSPEND, the wake_lock
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+ * prevents a full system suspend. If the type is WAKE_LOCK_IDLE, low power
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+ * states that cause large interrupt latencies or that disable a set of
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+ * interrupts will not entered from idle until the wake_locks are released.
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+ */
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+
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+enum {
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+ WAKE_LOCK_SUSPEND, /* Prevent suspend */
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+ WAKE_LOCK_IDLE, /* Prevent low power idle */
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+ WAKE_LOCK_TYPE_COUNT
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+};
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+
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+struct wake_lock {
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+#ifdef CONFIG_HAS_WAKELOCK
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+ struct list_head link;
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+ int flags;
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+ const char *name;
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+ unsigned long expires;
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+#ifdef CONFIG_WAKELOCK_STAT
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+ struct {
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+ int count;
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+ int expire_count;
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+ int wakeup_count;
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+ ktime_t total_time;
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+ ktime_t prevent_suspend_time;
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+ ktime_t max_time;
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+ ktime_t last_time;
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+ } stat;
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+#endif
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+#endif
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+};
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+
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+#ifdef CONFIG_HAS_WAKELOCK
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+
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+void wake_lock_init(struct wake_lock *lock, int type, const char *name);
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+void wake_lock_destroy(struct wake_lock *lock);
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+void wake_lock(struct wake_lock *lock);
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+void wake_lock_timeout(struct wake_lock *lock, long timeout);
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+void wake_unlock(struct wake_lock *lock);
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+
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+/* wake_lock_active returns a non-zero value if the wake_lock is currently
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+ * locked. If the wake_lock has a timeout, it does not check the timeout
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+ * but if the timeout had aready been checked it will return 0.
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+ */
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+int wake_lock_active(struct wake_lock *lock);
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+
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+/* has_wake_lock returns 0 if no wake locks of the specified type are active,
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+ * and non-zero if one or more wake locks are held. Specifically it returns
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+ * -1 if one or more wake locks with no timeout are active or the
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+ * number of jiffies until all active wake locks time out.
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+ */
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+long has_wake_lock(int type);
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+
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+#else
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+
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+static inline void wake_lock_init(struct wake_lock *lock, int type,
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+ const char *name) {}
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+static inline void wake_lock_destroy(struct wake_lock *lock) {}
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+static inline void wake_lock(struct wake_lock *lock) {}
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+static inline void wake_lock_timeout(struct wake_lock *lock, long timeout) {}
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+static inline void wake_unlock(struct wake_lock *lock) {}
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+
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+static inline int wake_lock_active(struct wake_lock *lock) { return 0; }
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+static inline long has_wake_lock(int type) { return 0; }
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+
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+#endif
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+
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+#endif
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+
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