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7483b4a4d9
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>
15 lines
419 B
Makefile
15 lines
419 B
Makefile
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ccflags-$(CONFIG_PM_DEBUG) := -DDEBUG
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obj-y += qos.o
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obj-$(CONFIG_PM) += main.o
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obj-$(CONFIG_VT_CONSOLE_SLEEP) += console.o
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obj-$(CONFIG_FREEZER) += process.o
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obj-$(CONFIG_SUSPEND) += suspend.o
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obj-$(CONFIG_PM_TEST_SUSPEND) += suspend_test.o
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obj-$(CONFIG_HIBERNATION) += hibernate.o snapshot.o swap.o user.o \
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block_io.o
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obj-$(CONFIG_PM_AUTOSLEEP) += autosleep.o
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obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o
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