From: Markus Pargmann <mpa@pengutronix.de>
Date: Thu, 16 Jan 2014 15:02:10 +0000 (+0100)
Subject: ASoC: core: Add signed register volume control logic
X-Git-Tag: v3.15-rc1~36^2~1^2~5^2~3^4~6^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f227b88f0fce5f9b82aa934f8829a741c2e06d82;p=pandora-kernel.git

ASoC: core: Add signed register volume control logic

Some codecs use signed volume control representation with non standard
register sizes, e.g. 6 or 7 bit signed integers.

This patch adds generic signed register volume control logic to
soc-core. Instead of a fixed width signed register control, this
implementation uses a 'min' value and the signed bit location to translate
it to an absolute volume. Using the 'sign_bit' we can calculate a
correct mask for the register values and translate it back into signed
integers of standard size.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
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