USB Wireless device support

[Bastien Nocera]

On Wed, 2021-01-13 at 16:17 +0100, Takashi Iwai wrote:
> On Wed, 13 Jan 2021 16:13:40 +0100,
> Bastien Nocera wrote:
> > 
> > On Wed, 2021-01-13 at 16:08 +0100, Takashi Iwai wrote:
> > > <snip>
> > > Nothing so far, and that's the problem.  HID is managed in a
> > > completely different layer, hence the integration needs to be
> > > done in
> > > a higher level like PA, I suppose.  In theory we might be able to
> > > extend UCM to handle the other external devices, though.
> > 
> > hid-prodikeys.c seems to do some MIDI stuff...
> 
> It creates its own sound card.  But you want to use the mixer switch
> for the existing audio interface, right?

My idea was to create my own sound card (it's a separate USB interface
after all) exporting the sidetone mixer, and figure out how to merge it
with the USB audio interface at PulseAudio's level.

Otherwise