On Sat, Sep 28, 2019 at 02:37:21PM +0200, Bastien Nocera wrote: > 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> > Ah, ok, my fault, then ok, let's see how your kernel driver ties into this then. thanks, greg k-h
