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

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Date:	Sat, 22 Jun 2013 18:43:01 +0200
From:	Sebastian Reichel <sre@...g0.de>
To:	Pavel Machek <pavel@....cz>
Cc:	Gaël PORTAY <g.portay@...rkiz.com>,
	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 Sat, Jun 22, 2013 at 01:26:20PM +0200, Pavel Machek wrote:
> 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.

Actually the n900 has hardware support for this. There's a
programmable LED driver on the board, which is called LP5523.

So... I don't think there's a daemon in maemo ;)

-- Sebastian

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