[alsa-devel] [PATCH 4/4] snd-usb-6fire: add analog input volume control

[Takashi Iwai]

At Thu, 12 Jan 2012 10:17:24 +0100,
Torsten Schenk wrote:
> 
> > >  static struct __devinitdata snd_kcontrol_new elements[] = {
> > > @@ -442,6 +497,15 @@
> > >  		.get = usb6fire_control_digital_thru_get,
> > >  		.put = usb6fire_control_digital_thru_put
> > >  	},
> > > +	{
> > > +		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
> > > +		.name = "Input 1/2 Capture Volume",
> > > +		.index = 0,
> > 
> > If this is the only volume element, you don't need to add "1/2", no?
> 
> The problem is, that there is only an input control for 2 out of 4
> analog input channels since channel 3 and 4 use a different ADC and
> there doesn't seem to be a volume control on that chip. Since this
> control only changes volume of channel 1 and 2, I wanted to have an
> indication about that.

Well, then the question is whether you need to give a stereo control
there.  If all I/O are supposed to be individual mono streams, it'd be
natural to provide a mono volume control with a proper index number
corresponding to each stream.


Takashi