Re: [PATCH V2 1/2] leds: leds-qti-rgb: Add LED driver for QTI TRI_LED module

From: Pavel Machek
Date: Mon Jun 05 2017 - 17:16:18 EST


Hi!

> Generally I came to a conclusion that it will be best to register
> additional LED RGB class device in an addition to three LED class
> devices representing each color. In order to avoid hard to solve
> locking problems I propose to allow for simultaneous access to LED
> class devices and LED RGB class device gathering them.
>
> All in all, currently we also don't give an exclusive access to
> a particular LED class device, which always can lead to overwriting
> current brightness by another process. These issues must be arbitrated
> by user space.
>
> I propose that LED RGB class device exposed following files:
>
> - red_brightness
> - green_brightness
> - blue_brightness
> - latch_color

Actually, I'd just do single file, "rgb_brightness" with 3
values. Overhead of writing 3 values is pretty much 0.
Pavel

--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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