[alsa-devel] [PATCH] [RFC 8/13] Intel SST sound card driver

[Mark Brown]

On Tue, Jul 07, 2009 at 12:05:45PM +0530, Harsha, Priya wrote:
> >-----Original Message-----
> >From: Mark Brown [mailto:broonie at opensource.wolfsonmicro.com]

> >ALSA core has an interface for representing jacks to user space which
> >should be used here - see include/sound/jack.h.

> Thanks for the note. I shall look into it further. Can you suggest any
> example ALSA driver that uses this functionality so that I can have a

A lot of the HDA drivers use it and there's a wrapper for ASoC too -
it's fairly likely that if you're running a current kernel your desktop
PC will support this interface already.  Searching the kernel source for
snd_jack_new() should turn up everything there is at the minute.

> reference. Also quick question around this, can I use this jack.h to
> event the user space?

Yes, the jacks currently appear as input devices to applications.
Takashi was also considering adding some ALSA-specific ways of reading
the state to go alongside these.