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

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Date:	Mon, 14 Mar 2016 11:49:39 +0100
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Danny Milosavljevic <dannym@...atchpost.org>
Cc:	Mark Brown <broonie@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	alsa-devel@...a-project.org, Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	linux-sunxi@...glegroups.com
Subject: Re: [linux-sunxi] Re: [PATCH v8 2/2] ASoc: sun4i-codec: Add FM, Line
 and Mic inputs

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

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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