[alsa-devel] [RFC 0/5] Add a gpio jack device

[Mark Brown]

On Wed, May 27, 2015 at 10:38:32PM -0700, Dylan Reid wrote:
> On Wed, May 27, 2015 at 10:26 AM, Mark Brown <broonie at kernel.org> wrote:

> > So like I say I was thinking that either the jack object has a list of
> > detection method phandles which point to other devices or the other
> > devices point at the jack object.

> I might not be completely following this.  Do we want to create a
> binding for the physical plug and another for the method used to
> detect the if a device is attached?

Yes, or at least allow other things to extend what the device is doing.

> What is the benefit in separating the plug from the detection method,
> these seem pretty tightly bound to me.  There are three main types of
> detection for headsets, gpio, ADC measurement, and offload to a codec
> or HP chip.  Are there situations where those would change separate
> from how the jack is connected?

No, but they can be combined onto a single jack - for example have a
GPIO switch that detects mechanical insertion and a CODEC that detects
microphone and button presses.  The GPIO/ADC combination used to be very
common, it's essentially just a non-integrated way of doing what your
accessory detection device does.  If you have non-audio functions on the
jack then things get even richer.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 473 bytes
Desc: Digital signature
URL: <http://mailman.alsa-project.org/pipermail/alsa-devel/attachments/20150528/32df3a88/attachment.sig>