linux-kernel - Re: spitz: add gpio button support (AK_INT and remote control description)

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Date:	Wed, 7 Oct 2009 13:06:44 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Stanislav Brabec <utx@...guin.cz>
Cc:	Pavel Machek <pavel@....cz>, rpurdie@...ys.net, lenz@...wisc.edu,
	kernel list <linux-kernel@...r.kernel.org>,
	Dirk@...er-Online.de, arminlitzel@....de,
	Cyril Hrubis <metan@....cz>, thommycheck@...il.com,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	dbaryshkov@...il.com, omegamoon@...il.com, eric.y.miao@...il.com
Subject: Re: spitz: add gpio button support (AK_INT and remote control
 description)

On Wed, Oct 07, 2009 at 01:29:51PM +0200, Stanislav Brabec wrote:

> SW_REMOTE_INSERT should be recognized by the Jack abstraction layer
> (sound/core/jack.c).

It's the other way around - the jack layer reports jacks for ALSA cards.
Also, for spitz you'd probably want to be using the ASoC wrapper layer.

> Well, I am thinking about defining extra values for resistors, that can
> make stuff even more useful at cost of need of non-standard wiring on
> fourth ring of the audio jack. It can generate SW_MICROPHONE_INSERT,
> SW_LINEOUT_INSERT, and not yet defined SW_HEADESET_INSERT and
> SW_LINEIN_INSERT (which would require hardware mod inside Zaurus for
> stereo line-in).

Headset should be represented by reporting headphone plus microphone on
one jack simultaneously.
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