x86, olpc-xo15-sci: enable lid close wakeup control through sysfs

x86, olpc-xo15-sci: enable lid close wakeup control through sysfs

Like most systems, OLPC's ACPI LID switch wakes up the system when the lid
is opened, but not when it is closed.

Under OLPC's opportunistic suspend model, the lid may be closed while the
system was oportunistically suspended with the screen running.  In this
event, we want to wake up to turn the screen off.

Enable control of normal ACPI wakeups through lid close events through a
new sysfs attribute "lid_wake_on_closed".  When set, and when LID wakeups
are enabled through ACPI, the system will wake up on both open and close
lid events.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Cc: Andres Salomon <dilinger@queued.net>
Cc: Matthew Garrett <mjg@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>