[alsa-devel] RFC: Jack-detection control elements on HD-audio

Jaroslav Kysela perex at perex.cz
Fri Jun 19 10:54:00 CEST 2009

On Fri, 19 Jun 2009, Takashi Iwai wrote:

> Hi,
> yet another thing I've worked recently on is a bit more generalized
> framework for jack-sense reporting for HD-audio.  This supersedes the
> existing jack-sense reporting via the input layer.  In addition, it
> gives the corresponding control elements.
> For example, you'll have "Jack HP-Out" (or a bit more verbose like
> "Jack HP-Out at Ext Rear") control via control API as well as other
> mixer controls.  This can notify when a jack is plugged/unplugged.
> But, another big win is that you can read the current pin sense just
> by reading this element.

Before definining such extension, I would really see to define standard 
control names in Documentation/ControlNames.txt file. It seems to me that 
most new drivers does not follow suggested naming. The document should be 
reviewed, of course.


Jaroslav Kysela <perex at perex.cz>
Linux Kernel Sound Maintainer
ALSA Project, Red Hat, Inc.

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