linux-kernel - Re: [PATCH] input: extend EV

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Message-ID: <20070216140451.GA8904@elf.ucw.cz>
Date:	Fri, 16 Feb 2007 15:04:51 +0100
From:	Pavel Machek <pavel@....cz>
To:	Németh Márton <nm127@...email.hu>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	linux-input@...ey.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] input: extend EV_LED

Hi!

> > > >I do not know the LED subsystem in detail, but I do not 
> > > >know
> > > >any possibility to access the i8042 from different 
> > > >subsystem
> > > >than the input subsystem.
> > > >
> > > >What do you think and recommend?
> > > 
> > > I think you need to use leds framework for what you are 
> > > trying to do.
> > 
> > I'm actually not sure if led framework can do that. It was
> designed
> > for leds on gpios, and handles blinking itself.
> > 
> > But he could export two leds :-).
> 
> Hi,
> 
> what do you mean about two leds? The first one would be
> off/0.5Hz and the other off/1Hz?


Somethinglike that.

> I read in linux/Documentation/led-class.txt the following:
> 
> | Some leds can be programmed to flash in hardware. As this
> isn't a generic
> | LED device property, this should be exported as a device
> specific sysfs
> | attribute rather than part of the class if this
> functionality is required.
> 
> Does it mean that neither the input subsystem nor the led
> subsystem is designed for hardware acelerated blinking leds?

Seems so.



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