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

Takashi Iwai tiwai at suse.de
Fri Jun 19 10:04:47 CEST 2009


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.

I think this is a sort of feature Lennart wanted for PA.
Lennart, does it make sense?

The test codes are already in topic/hda-jack branch on sound-unstable
GIT tree:
  git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-unstable-2.6.git topic/hda-jack

Any comments appreciated.  This is also intended for 2.6.32, not for
2.6.31 merge, of course :)



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