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authorRafael J. Wysocki <rjw@sisk.pl>2012-04-29 22:53:22 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2012-05-01 21:25:38 +0200
commit7483b4a4d9abf9dcf1ffe6e805ead2847ec3264e (patch)
treed03af746dc3be6480580ec569e0c2d708031f0bd /include/linux/suspend.h
parent6791e36c4a40e8930e08669e60077eea6770c429 (diff)
PM / Sleep: Implement opportunistic sleep, v2
Introduce a mechanism by which the kernel can trigger global transitions to a sleep state chosen by user space if there are no active wakeup sources. It consists of a new sysfs attribute, /sys/power/autosleep, that can be written one of the strings returned by reads from /sys/power/state, an ordered workqueue and a work item carrying out the "suspend" operations. If a string representing the system's sleep state is written to /sys/power/autosleep, the work item triggering transitions to that state is queued up and it requeues itself after every execution until user space writes "off" to /sys/power/autosleep. That work item enables the detection of wakeup events using the functions already defined in drivers/base/power/wakeup.c (with one small modification) and calls either pm_suspend(), or hibernate() to put the system into a sleep state. If a wakeup event is reported while the transition is in progress, it will abort the transition and the "system suspend" work item will be queued up again. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'include/linux/suspend.h')
-rw-r--r--include/linux/suspend.h13
1 files changed, 12 insertions, 1 deletions
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index ac1c114c499d..76b7ec7d3a81 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -356,7 +356,7 @@ extern int unregister_pm_notifier(struct notifier_block *nb);
extern bool events_check_enabled;
extern bool pm_wakeup_pending(void);
-extern bool pm_get_wakeup_count(unsigned int *count);
+extern bool pm_get_wakeup_count(unsigned int *count, bool block);
extern bool pm_save_wakeup_count(unsigned int count);
static inline void lock_system_sleep(void)
@@ -407,6 +407,17 @@ static inline void unlock_system_sleep(void) {}
#endif /* !CONFIG_PM_SLEEP */
+#ifdef CONFIG_PM_AUTOSLEEP
+
+/* kernel/power/autosleep.c */
+void queue_up_suspend_work(void);
+
+#else /* !CONFIG_PM_AUTOSLEEP */
+
+static inline void queue_up_suspend_work(void) {}
+
+#endif /* !CONFIG_PM_AUTOSLEEP */
+
#ifdef CONFIG_ARCH_SAVE_PAGE_KEYS
/*
* The ARCH_SAVE_PAGE_KEYS functions can be used by an architecture