On Tue, May 20, 2014 at 02:40:12PM +0200, Rafael J. Wysocki wrote: > On Monday, May 19, 2014 08:43:02 PM Dmitry Torokhov wrote: > > Hi Dudley, > > > > On Wed, Apr 16, 2014 at 08:39:34AM +0000, Dudley Du wrote: > > > Rely on EV_SW and SW_LID bits to identify a LID device, and hook > > > up our filter to listen for SW_LID events to enable/disable touchpad when > > > LID is open/closed. > > > TEST=test on Chomebooks. > > > > This is a policy and it does not belong in the kernel. Please work with > > Rafael to establish generic interface to put devices into low power mode > > (like accelerating runtime PM idle timeout) > > I'm not really sure what you mean here, care to be more specific?
I think we chatted about this before - we need a uniform interface for userspace to put devices into low power mode on demand. As implementation detail I thought we could require runtime PM for that and simply pretend that the PM timeout expired early when userspace invokes that API. > > > and use it when userspace detects that lid is closed. > > I guess we get an event then, don't we? Right, userspace gets EV_SW/SW_LID input event and needs to react. In this particular case the desire is to power down touchpad (since it is unaccessible). I am not sure why system suspend (which I expect happen in reaction to lid closing) is not enough, but that's question for Dudley. Thanks. -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
