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| author | Johannes Stezenbach <js@sig21.net> | 2011-07-11 19:01:23 +0400 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2011-07-13 19:24:31 +0400 |
| commit | 796884391504426e9da15bdf76f73c5f4eda3714 (patch) | |
| tree | 2e7505ffa5823c93fea5b5403c24c0e3f8c2b5a3 /Documentation | |
| parent | 5b7396709e0b2d43527024316e0bc4630759bcf3 (diff) | |
| download | linux-796884391504426e9da15bdf76f73c5f4eda3714.tar.xz | |
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>
Diffstat (limited to 'Documentation')
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