linux-kernel - Re: [RFC PATCH] ES938 support for ES18xx driver

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Date:	Sun, 15 Sep 2013 23:23:58 +0200
From:	Andreas Mohr <andi@...as.de>
To:	Ondrej Zary <linux@...nbow-software.org>
Cc:	Andreas Mohr <andi@...as.de>, alsa-devel@...a-project.org,
	krzysztof.h1@...pl,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] ES938 support for ES18xx driver

On Sun, Sep 15, 2013 at 11:04:26PM +0200, Ondrej Zary wrote:
> On Sunday 15 September 2013 22:35:20 Andreas Mohr wrote:
> > What!?!? I didn't quite expect any kernel dev to have that one, too ;)
> 
> Don't remember where I got it from but it looked nice so I bought it :)

Yup, e.g. the builtin amp is quite nice.

> > Thanks for hinting at the TLV control dB values thingy! Didn't know that
> > such thing existed, thus azt3328 does not have it (yet?).
> 
> It's a nice thing, especially for cards that can go above 0 dB. You then know 
> that the sound can be distorted when you set e.g. PCM volume too high.

Hmm, any hint how to precisely do dB values normalization scaling,
for a card where this is not documented? Or perhaps that's actually easy -
haven't thought about it...

> > Is there any chip ID/version register to be identified?
> 
> No, there are only 8 registers, all(? - haven't tested) R/W.

OK, but possibly they happen to be creating another virtual register mapping range?
(i.e. index/data register combo?)

Andreas Mohr
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