On Sat, 2019-09-28 at 14:18 +0200, Greg KH wrote:
> Again, the power_supply api is for power going the other way in the
> system. That's not an "existing clearly defined API in kernel
> space".
No it isn't, not since 2011.
commit 25a0bc2dfc2ea732f40af2dae52426ead66ae76e
Author: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Wed Dec 7 11:24:20 2011 -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@xxxxxxxx>
Cc: Richard Hughes <richard@xxxxxxxxxxx>
