linux-kernel - Re: [alsa-devel] [RFC] [PATCH 3/3] ASoC: add support for Amstrad E3 (Delta) machine

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Date:	Thu, 23 Jul 2009 09:57:38 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Janusz Krzysztofik <jkrzyszt@....icnet.pl>
Cc:	alsa-devel@...a-project.org, Jonathan McDowell <noodles@...th.li>,
	Tony Lindgren <tony@...mide.com>,
	Peter Ujfalusi <peter.ujfalusi@...ia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	e3-hacking@...th.li, Arun KS <arunks@...tralsolutions.com>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Takashi Iwai <tiwai@...e.de>
Subject: Re: [alsa-devel] [RFC] [PATCH 3/3] ASoC: add support for Amstrad
 E3 (Delta) machine

On Wed, Jul 22, 2009 at 09:18:05PM +0200, Janusz Krzysztofik wrote:

> After all, I am not sure what your preferences finally are. If you still think 
> that exporting gpio based jack state from ASoC framework over gpiolib sysfs 
> doesn't hurt and can be usefull, I'll remove the code from my driver and 
> provide a patch against sound/soc/soc-jack.c. But if you would rather prefere 
> exposing jack state in a more general, not gpio limited way instead, or 
> depend on input layer provided EVIOCGSW ioctl, as Dmitry suggested 
> (unfortunatelly, unlike generic ldattach, there is no utility ready for 
> use!), I'd rather keep this gpio_export() in my driver, let's say for 
> diagnostic purposes, at least until that different option is ready for use in 
> a convenient way.

Jack state is already exposed via the input layer by the ALSA jack core.
Reporting of GPIO state via gpio_export() would be additional to that
and would be purely for debug purposes, it would not be recommended for
use by userspace applications.
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