ASoC: STA32x: Add mixer controls for biquad coefficients

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The STA32x has a number of preset EQ settings, but also
allows full user control of the biquad filter coeffcients
(when "Automode EQ" is set to "User").
Each biquad has five signed, 24bit, fixed-point coefficients
representing the range -1...1.  The five biquad coefficients
can be uploaded in one atomic operation into on-chip
coefficient RAM.
There are also a few prescale, postscale and mixing
coefficients, in the same numeric format and range
(a negative coefficient inverts phase).

These coefficients are made available as SNDRV_CTL_ELEM_TYPE_BYTES
mixer controls.

Signed-off-by: Johannes Stezenbach <js@sig21.net>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

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Johannes Stezenbach 2011-07-11 17:01:23 +02:00 • committed by Mark Brown

parent 5b7396709e

commit 7968843915

1 changed files with 124 additions and 0 deletions

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sound/soc/codecs/sta32x.c

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