Re: [linux-sunxi] Re: [PATCH v8 2/2] ASoc: sun4i-codec: Add FM, Line and Mic inputs

From: Maxime Ripard
Date: Mon Mar 14 2016 - 06:49:53 EST

On Sat, Mar 12, 2016 at 08:52:22AM +0100, Danny Milosavljevic wrote:
> Hi,
> does anyone know the answer to the questions below?
> > The other direction (making two controls which both do the same and update
> > each other's value) doesn't seem to be easily available.
> > Should I write a _put handler that does it manually?
> > (Or should that be handled by alsa-lib mixer modules instead?)
> > Is it possible to merge the "Left Mixer" control and respective
> > "Right Mixer" control into one selem in alsamixer?
> >
> > Because alsamixer actually has support for one-sided muting.

Mark, do you know how to do it?

IIRC, in order to have shared controls, you just needed to share the
controls structure.

> If that's unknown, I can post v9 without doing the grouping-together
> of mixer controls and we can use it like that - I don't want the
> patch to stall indefinitely on mere usability issues...

Unfortunately, that is exposed to the user-space. Once it's in, you
cannot change it / fix it anymore.


Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering

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