[alsa-devel] [PATCH] ALSA: SoC: Added jack detection kcontrol support

Mark Brown broonie at kernel.org
Tue Jul 23 14:40:23 CEST 2013

On Mon, Jul 22, 2013 at 02:11:44PM -0700, Felipe Tonello wrote:

> My question is: Why ALSA Jack support uses evdev input events to
> notify user-space? Is there any user-space relying on that? If no, I
> would like to change ALSA Jack implementation to only use KControl and
> remove specific implementations.

This was the existing kernel API at the time that the code was added -
I beleive people had been doing that for simple switches that detect the
physical presence of a jack since it looks exactly like a button from a
hardware point of view.  See the original commit adding the code.
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