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

Takashi Iwai tiwai at suse.de
Fri Jun 19 11:02:27 CEST 2009

At Fri, 19 Jun 2009 10:54:00 +0200 (CEST),
Jaroslav Kysela wrote:
> 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.

That's true.  We definitely need a standard naming.

But note that these controls are no mixers but provided as IFACE_CARD,
so they won't pollute the mixer abstraction.  So, it's rather the
question of the user of these controls.


More information about the Alsa-devel mailing list