[alsa-devel] [PATCH v2 1/2] ALSA: jack: create jack kcontrols for every jack input device

[Mark Brown]

On Tue, Mar 24, 2015 at 07:50:39AM +0100, David Henningsson wrote:
> On 2015-03-23 17:41, Mark Brown wrote:

> >>For headphone or headset, one hw switch only:

> >>  * "Headphone Jack"
> >>  * "Headset Mic Phantom Jack"

> >I'd have expected these to be the same thing, just with the second case
> >always having the same state for both switches.

> We need to distinguish the use cases: in case of independent switches, we
> can make the assumption that if the user plugged in a headset, the user
> wants to use the headset mic instead of the internal mic, so we switch to
> it.

> In the other case, where we don't know if the user plugged in a headphone or
> a headset, we need to ask the user what (s)he plugged in, so we can
> determine whether to select headphone+internal mic or headphone+headset mic.

Hrm, I can see that.  However it feels wrong to have no state change at
all on the microphone part of the jack - I think I would have expected
this case to be flagged as a separate mode, say "Tied", so that simpler
applications have more chance to do the right thing.  It's a bit of a
separate issue though and it's a bit late now as we've already shipped
the ABI for the kcontrols.
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