tree 2e7505ffa5823c93fea5b5403c24c0e3f8c2b5a3
parent 5b7396709e0b2d43527024316e0bc4630759bcf3
author Johannes Stezenbach <js@sig21.net> 1310396483 +0200
committer Mark Brown <broonie@opensource.wolfsonmicro.com> 1310570671 +0900

ASoC: STA32x: Add mixer controls for biquad coefficients

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>