tree 180dc7e4122da2f40b241c5e936a0668420f4bb7
parent cfcfc9eca2bcbd26a8e206baeb005b055dbf8e37
author Jeremy Fitzhardinge <jeremy@goop.org> 1323285860 -0800
committer Jeremy Fitzhardinge <jeremy@goop.org> 1323452525 -0800

power_supply: add SCOPE attribute to power supplies

This adds a "scope" attribute to a power_supply, which indicates how
much of the system it powers.  It appears in sysfs as "scope" or in
the uevent file as POWER_SUPPLY_SCOPE=.  There are presently three
possible values:
	Unknown - unknown power topology
	System - the power supply powers the whole system
	Device - it powers a specific device, or tree of devices

A power supply which doesn't have a "scope" attribute should be assumed to
have "System" scope.

In general, usermode should assume that loss of all System-scoped power
supplies will power off the whole system, but any single one is sufficient
to power the system.

Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Richard Hughes <richard@hughsie.com>