Re: LED devices & poll() for brightness attribute

From: Pavel Machek
Date: Wed Feb 22 2017 - 07:26:14 EST


> But this support is useful just for one single central userspace
> application which will control all leds in system other application
> which will change state by /sys/class/leds/ will de-synchronize that one
> central application.

Yes. Does it matter for some real use case?

> So I think new ABI is not sufficient and I would propose to add poll()
> support also for changes done by userspace, write() to attribute
> /sys/class/leds/.../brightness.

Not easily possible, as we have triggers, and this was discussed in
great great lengths before. Please go through that discussion.

(cesky, pictures)

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