[alsa-devel] [PATCH 1/4] ALSA: Added jack detection kcontrol support
eu at felipetonello.com
Fri Jul 26 21:10:27 CEST 2013
On Fri, Jul 26, 2013 at 11:54 AM, Mark Brown <broonie at kernel.org> wrote:
> On Fri, Jul 26, 2013 at 11:25:30AM -0700, Felipe F. Tonello wrote:
>> + /* Update ALSA KControl interface */
>> + snd_kctl_jack_report((struct snd_card *)jack->kctl->private_data, jack->kctl, !!status);
> This isn't ideal for multi-function jacks like headsets - it will report
> a single boolean value for the jack regardless of what's plugged in
> meaning userpace can't do things like figure out if a headset or
> headphone is present. It's probably OK for any realistic input button
> since you're not going to get an input button without other things being
The KControl for Jack is boolean anyway. You can check it with "amixer
contents". user-space can figure out based on the control name. At
least PulseAudio does that way.
> What I'd expect to happen here is that for multi function jacks we
> create a control per function if the controls are valid.
Do you mean based on snd_jack_types?
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