linux-kernel - Re: [PATCH] ALSA: SoC: Added jack detection kcontrol support

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Date:	Tue, 23 Jul 2013 13:40:23 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Felipe Tonello <eu@...ipetonello.com>
Cc:	alsa-devel@...a-project.org, LiamGirdwoodlgirdwood@...il.com,
	JaroslavKyselaperex@...ex.cz, TakashiIwaitiwai@...e.de,
	linux-kernel@...r.kernel.org,
	"Felipe F. Tonello" <ftonello@...cacor.com>
Subject: Re: [PATCH] ALSA: SoC: Added jack detection kcontrol support

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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