[RFC] Volume control across multiple registers

[Mark Brown]

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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