tree 8616a1b7cdff33967a4a55e90b83ecce764f9735
parent 9113e260767b1cb44f8da0e5922e1a9a5417c4b8
author Zhang Rui <rui.zhang@intel.com> 1401261818 +0800
committer Rafael J. Wysocki <rafael.j.wysocki@intel.com> 1401450325 +0200

ACPI / battery: wakeup the system only when necessary

ACPI Battery device receives notifications from firmware frequently,
and most of these notifications are some general events, like battery
remaining capacity change, etc, which should not wake the system up
if the system is in suspend/hibernate state.

This causes a problem that the system wakes up from suspend to freeze
shortly, because there is an ACPI battery notification every 10 seconds.

Fix the problem in this patch by registering ACPI battery device'
own wakeup source, and waking up the system only when the battery remaining
capacity is critical low, or lower than the alarm capacity set via _BTP.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=76221
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>