linux-kernel - Re: [RFC] Volume control across multiple registers

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Message-ID: <20200220115941.GB3926@sirena.org.uk>
Date:   Thu, 20 Feb 2020 11:59:41 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Dan Murphy <dmurphy@...com>
Cc:     lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] Volume control across multiple registers

On Wed, Feb 19, 2020 at 03:11:47PM -0600, Dan Murphy wrote:

> I was looking at using the DAPM calls and use PGA_E and define an event but
> there really is no good way to get the current volume setting.

Store it in a variable in the driver's private data (there's a number of
examples of doing that for various controls, the process doesn't change
just because it's a volume), or if you've got a register cache it could
be just as easy to do the register reads and combine the values.

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