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

[Mark Brown]

On Wed, Jul 08, 2009 at 11:14:07AM +0530, Harsha, Priya wrote:
> >-----Original Message-----
> >From: Mark Brown [mailto:broonie at opensource.wolfsonmicro.com]

> >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.

> If I create a jack sense device, how would an application use it?
> Currently do we have any mechanism in ALSA to send events to user space
> when a jack is detected? If not, would it be ok if I stick to netlink

Yes, they see it as a normal input device under /dev/input.  The jack
input device will provide one or more switches and buttons depending on
what it can detect.

> events for now. We have a platform specific daemon that is being
> developed that listens on netlink events and that is why the driver
> sends them. 

Your daemon should be able to use /dev/input for this.  This will also
help if users run other applications on the system since the standard
API for jack sense will be there.