ASoC: core: Add signed register volume control logic

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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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Markus Pargmann 2014-01-16 16:02:10 +01:00 • committed by Mark Brown

parent 38dbfb59d1

commit f227b88f0f

2 changed files with 62 additions and 7 deletions

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1

include/sound/soc.h

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68

sound/soc/soc-core.c

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