linux-kernel - Re: [PATCH V3] led: Backlight trigger for led subsystem

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Message-ID: <20081007135420.GB1592@ucw.cz>
Date:	Tue, 7 Oct 2008 15:54:20 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Rodolfo Giometti <giometti@...eenne.com>
Cc:	linux-kernel@...r.kernel.org, Richard Purdie <rpurdie@...ys.net>
Subject: Re: [PATCH V3] led: Backlight trigger for led subsystem

Hi!

> This patch set adds a new led trigger which emulates the backlight
> behaviour: the leds are turned off and on each time the display blanks
> and unblacks.
> 
> Since backlights are usually implemented with leds this patch set is
> useful for those drivers whose manage leds controller used as
> backlight controller.
> 
> The driver simply registers itself into the led subsystem and then the
> user may get backlight emulation by setting the "backlight"
> trigger. Moreover a driver, which usually manages more than one led,
> can use some leds as "led" and the others as "backlights" at user
> request.

We already have backlight subsystem, it can also handle display
brightness. Why not use that?


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