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    SubjectRe: [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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