[alsa-devel] [PATCH V3 1/5] sound: asoc: Adding support for STA529 Audio Codec

[Lu Guanqun]

On Thu, Apr 14, 2011 at 10:19:36PM +0800, Lu Guanqun wrote:
> On Thu, Apr 14, 2011 at 05:54:11PM +0800, Takashi Iwai wrote:
> > At Mon, 11 Apr 2011 07:56:22 -0700,
> > Mark Brown wrote:
> > > 
> > > > +static const struct snd_kcontrol_new sta529_new_snd_controls[] = {
> > > > +	SOC_ENUM("pwm select", pwm_src_enum),
> > > > +	SOC_ENUM("mode select", mode_src_enum),
> > > > +};
> > > 
> > > ALSA control names are idiomatically things like "PWM Select" with
> > > capitalisation.
> > 
> > Actually, the capital words are no mandatory requirement (although
> > it's conventionally so).  It's just alsa-mixer grouping rule that
> > requires the capital words "Play", "Capture", "Volume", "Switch",
> > etc.
> 
> Hi Takashi,
> 
> Where can I find these alsa-mixer grouping rule?
> So that I can obey these rules and make them appear in the right view in
> alsamixer.

Hi Takashi,

I'm reading this comment from file `sound/aoa/codecs/tas.c`:

        /* If we name this 'Input Source', it properly shows up in
         * alsamixer as a selection, * but it's shown under the
         * 'Playback' category.
         * If I name it 'Capture Source', it shows up in strange
         * ways (two bools of which one can be selected at a
         * time) but at least it's shown in the 'Capture'
         * category.
         * I was told that this was due to backward compatibility,
         * but I don't understand then why the mangling is *not*
         * done when I name it "Input Source".....
         */

I'm wondering what's the story behind? Can you shed some lights?

> 
> > 
> > You don't have to obey Capitalism :)
> > 
> > 
> > Takashi
> > _______________________________________________
> > Alsa-devel mailing list
> > Alsa-devel at alsa-project.org
> > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> 
> -- 
> guanqun
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-- 
guanqun