linux-kernel - Re: [RFC PATCH] led: add Cycle LED trigger.

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Message-ID: <20130622112619.GA8075@amd.pavel.ucw.cz>
Date:	Sat, 22 Jun 2013 13:26:20 +0200
From:	Pavel Machek <pavel@....cz>
To:	Gaël PORTAY <g.portay@...rkiz.com>
Cc:	Rob Landley <rob@...dley.net>, Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	"Milo(Woogyom) Kim" <milo.kim@...com>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [RFC PATCH] led: add Cycle LED trigger.

On Tue 2013-06-18 18:24:23, Gaël PORTAY wrote:
> Currently, none of available triggers supports playing with the LED brightness
> level.  The cycle trigger provides a way to define custom brightness cycle.
> For example, it is easy to customize the cycle to mock up the rhythm of human
> breathing which is a nice cycle to tell the user the system is doing something.
> 
> This trigger is meant to be usable for waiting an event to happen, for example
> when the system gets ready.  Those cycles may be used to reflect well known
> system status (e.g. idle mode, startup...).
> 
> This implementation provides several interfaces:
>  - to define the cycle itself:
>    * plot: definition of plot points using plot or rawplot files,
>            each points defines the brightness level
>    * interval: constant time interval between each plot point
>  - to control the cycle:
>    * repeat: the number of repetition of the whole plot cycle
>              0 for an infinite loop
>    * control: used to control the cycle trigger
>      + "start"/"stop": to start/stop the cycle
>      + "reset" to clear the cycle counter and the internal plot point index
>      + "pause"/"resume" to pause/resume the cycle
> 
> Signed-off-by: Gaël PORTAY <g.portay@...rkiz.com>

I'd say this should go to userspace.... and maybe should handle RGB
leds. ... like the one on n900/HTC dream/....

Actually, there's probably some daemon in maemo that already does
this.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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