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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>
This commit is contained in:
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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124
sound/soc/codecs/sta32x.c
View File

@ -177,6 +177,95 @@ static const struct soc_enum sta32x_limiter1_release_rate_enum =
static const struct soc_enum sta32x_limiter2_release_rate_enum =
SOC_ENUM_SINGLE(STA32X_L2AR, STA32X_LxR_SHIFT,
16, sta32x_limiter_release_rate);
/* byte array controls for setting biquad, mixer, scaling coefficients;
* for biquads all five coefficients need to be set in one go,
* mixer and pre/postscale coefs can be set individually;
* each coef is 24bit, the bytes are ordered in the same way
* as given in the STA32x data sheet (big endian; b1, b2, a1, a2, b0)
*/
static int sta32x_coefficient_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
int numcoef = kcontrol->private_value >> 16;
uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
uinfo->count = 3 * numcoef;
return 0;
}
static int sta32x_coefficient_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
int numcoef = kcontrol->private_value >> 16;
int index = kcontrol->private_value & 0xffff;
unsigned int cfud;
int i;
/* preserve reserved bits in STA32X_CFUD */
cfud = snd_soc_read(codec, STA32X_CFUD) & 0xf0;
/* chip documentation does not say if the bits are self clearing,
* so do it explicitly */
snd_soc_write(codec, STA32X_CFUD, cfud);
snd_soc_write(codec, STA32X_CFADDR2, index);
if (numcoef == 1)
snd_soc_write(codec, STA32X_CFUD, cfud | 0x04);
else if (numcoef == 5)
snd_soc_write(codec, STA32X_CFUD, cfud | 0x08);
else
return -EINVAL;
for (i = 0; i < 3 * numcoef; i++)
ucontrol->value.bytes.data[i] =
snd_soc_read(codec, STA32X_B1CF1 + i);
return 0;
}
static int sta32x_coefficient_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
int numcoef = kcontrol->private_value >> 16;
int index = kcontrol->private_value & 0xffff;
unsigned int cfud;
int i;
/* preserve reserved bits in STA32X_CFUD */
cfud = snd_soc_read(codec, STA32X_CFUD) & 0xf0;
/* chip documentation does not say if the bits are self clearing,
* so do it explicitly */
snd_soc_write(codec, STA32X_CFUD, cfud);
snd_soc_write(codec, STA32X_CFADDR2, index);
for (i = 0; i < 3 * numcoef; i++)
snd_soc_write(codec, STA32X_B1CF1 + i,
ucontrol->value.bytes.data[i]);
if (numcoef == 1)
snd_soc_write(codec, STA32X_CFUD, cfud | 0x01);
else if (numcoef == 5)
snd_soc_write(codec, STA32X_CFUD, cfud | 0x02);
else
return -EINVAL;
return 0;
}
#define SINGLE_COEF(xname, index) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
.info = sta32x_coefficient_info, \
.get = sta32x_coefficient_get,\
.put = sta32x_coefficient_put, \
.private_value = index | (1 << 16) }
#define BIQUAD_COEFS(xname, index) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
.info = sta32x_coefficient_info, \
.get = sta32x_coefficient_get,\
.put = sta32x_coefficient_put, \
.private_value = index | (5 << 16) }
static const struct snd_kcontrol_new sta32x_snd_controls[] = {
SOC_SINGLE_TLV("Master Volume", STA32X_MVOL, 0, 0xff, 1, mvol_tlv),
SOC_SINGLE("Master Switch", STA32X_MMUTE, 0, 1, 1),
@ -232,6 +321,29 @@ SOC_SINGLE_TLV("Limiter1 Release Threshold (DRC Mode)", STA32X_L1ATRT, STA32X_Lx
16, 0, sta32x_limiter_drc_release_tlv),
SOC_SINGLE_TLV("Limiter2 Release Threshold (DRC Mode)", STA32X_L2ATRT, STA32X_LxR_SHIFT,
16, 0, sta32x_limiter_drc_release_tlv),
BIQUAD_COEFS("Ch1 - Biquad 1", 0),
BIQUAD_COEFS("Ch1 - Biquad 2", 5),
BIQUAD_COEFS("Ch1 - Biquad 3", 10),
BIQUAD_COEFS("Ch1 - Biquad 4", 15),
BIQUAD_COEFS("Ch2 - Biquad 1", 20),
BIQUAD_COEFS("Ch2 - Biquad 2", 25),
BIQUAD_COEFS("Ch2 - Biquad 3", 30),
BIQUAD_COEFS("Ch2 - Biquad 4", 35),
BIQUAD_COEFS("High-pass", 40),
BIQUAD_COEFS("Low-pass", 45),
SINGLE_COEF("Ch1 - Prescale", 50),
SINGLE_COEF("Ch2 - Prescale", 51),
SINGLE_COEF("Ch1 - Postscale", 52),
SINGLE_COEF("Ch2 - Postscale", 53),
SINGLE_COEF("Ch3 - Postscale", 54),
SINGLE_COEF("Thermal warning - Postscale", 55),
SINGLE_COEF("Ch1 - Mix 1", 56),
SINGLE_COEF("Ch1 - Mix 2", 57),
SINGLE_COEF("Ch2 - Mix 1", 58),
SINGLE_COEF("Ch2 - Mix 2", 59),
SINGLE_COEF("Ch3 - Mix 1", 60),
SINGLE_COEF("Ch3 - Mix 2", 61),
};
static const struct snd_soc_dapm_widget sta32x_dapm_widgets[] = {
@ -686,6 +798,17 @@ static int sta32x_remove(struct snd_soc_codec *codec)
return 0;
}
static int sta32x_reg_is_volatile(struct snd_soc_codec *codec,
unsigned int reg)
{
switch (reg) {
case STA32X_CONFA ... STA32X_L2ATRT:
case STA32X_MPCC1 ... STA32X_FDRC2:
return 0;
}
return 1;
}
static const struct snd_soc_codec_driver sta32x_codec = {
.probe = sta32x_probe,
.remove = sta32x_remove,
@ -693,6 +816,7 @@ static const struct snd_soc_codec_driver sta32x_codec = {
.resume = sta32x_resume,
.reg_cache_size = STA32X_REGISTER_COUNT,
.reg_word_size = sizeof(u8),
.volatile_register = sta32x_reg_is_volatile,
.set_bias_level = sta32x_set_bias_level,
.controls = sta32x_snd_controls,
.num_controls = ARRAY_SIZE(sta32x_snd_controls),