[alsa-devel] Jack event API - decision needed

Mark Brown broonie at opensource.wolfsonmicro.com
Wed Jun 29 04:59:18 CEST 2011

On Tue, Jun 28, 2011 at 06:35:33PM +0200, Takashi Iwai wrote:

> If only the same functionality is required as currently done in the
> input-jack layer, re-implementing the jack-detection elements in ALSA
> control API is pretty easy.  It means that the control element would
> have some jack name with a location prefix or such, reports the
> current jack status, and notifies the jack change.  That's all.
> Optionally, it can have a TLV data giving the HD-audio jack
> attribute, too.

It needs a subset of the current information - it should report only
audio events, so pretty much only headphone, microphone or line out
presence.  Anything else needs to be reported via a different API and
figured out by userspace, and the input device should stay there for
button press events.

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