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ASoC: cs42l42: Add control for audio slow-start switch

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This adds an ALSA control so that the slow-start audio ramp feature
can be disabled. This is useful for high-definition audio applications.

The register field is unusual in that it is a 3-bit field with only
two valid values, 000=off and 111=on.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20211101101006.13092-1-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Richard Fitzgerald 2021-11-01 10:10:06 +00:00 committed by Mark Brown
parent 8d0872f623
commit 7ec4a058c1
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 32 additions and 1 deletions
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30
sound/soc/codecs/cs42l42.c
View File

@ -42,6 +42,7 @@ static const struct reg_default cs42l42_reg_defaults[] = {
{ CS42L42_SRC_CTL, 0x10 },
{ CS42L42_MCLK_CTL, 0x02 },
{ CS42L42_SFTRAMP_RATE, 0xA4 },
{ CS42L42_SLOW_START_ENABLE, 0x70 },
{ CS42L42_I2C_DEBOUNCE, 0x88 },
{ CS42L42_I2C_STRETCH, 0x03 },
{ CS42L42_I2C_TIMEOUT, 0xB7 },
@ -177,6 +178,7 @@ static bool cs42l42_readable_register(struct device *dev, unsigned int reg)
case CS42L42_MCLK_STATUS:
case CS42L42_MCLK_CTL:
case CS42L42_SFTRAMP_RATE:
case CS42L42_SLOW_START_ENABLE:
case CS42L42_I2C_DEBOUNCE:
case CS42L42_I2C_STRETCH:
case CS42L42_I2C_TIMEOUT:
@ -387,6 +389,28 @@ static const struct regmap_config cs42l42_regmap = {
static DECLARE_TLV_DB_SCALE(adc_tlv, -9700, 100, true);
static DECLARE_TLV_DB_SCALE(mixer_tlv, -6300, 100, true);
static int cs42l42_slow_start_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
u8 val;
/* all bits of SLOW_START_EN much change together */
switch (ucontrol->value.integer.value[0]) {
case 0:
val = 0;
break;
case 1:
val = CS42L42_SLOW_START_EN_MASK;
break;
default:
return -EINVAL;
}
return snd_soc_component_update_bits(component, CS42L42_SLOW_START_ENABLE,
CS42L42_SLOW_START_EN_MASK, val);
}
static const char * const cs42l42_hpf_freq_text[] = {
"1.86Hz", "120Hz", "235Hz", "466Hz"
};
@ -431,7 +455,11 @@ static const struct snd_kcontrol_new cs42l42_snd_controls[] = {
CS42L42_DAC_HPF_EN_SHIFT, true, false),
SOC_DOUBLE_R_TLV("Mixer Volume", CS42L42_MIXER_CHA_VOL,
CS42L42_MIXER_CHB_VOL, CS42L42_MIXER_CH_VOL_SHIFT,
0x3f, 1, mixer_tlv)
0x3f, 1, mixer_tlv),
SOC_SINGLE_EXT("Slow Start Switch", CS42L42_SLOW_START_ENABLE,
CS42L42_SLOW_START_EN_SHIFT, true, false,
snd_soc_get_volsw, cs42l42_slow_start_put),
};
static int cs42l42_hp_adc_ev(struct snd_soc_dapm_widget *w,

3
sound/soc/codecs/cs42l42.h
View File

@ -62,6 +62,9 @@
#define CS42L42_INTERNAL_FS_MASK (1 << CS42L42_INTERNAL_FS_SHIFT)
#define CS42L42_SFTRAMP_RATE (CS42L42_PAGE_10 + 0x0A)
#define CS42L42_SLOW_START_ENABLE (CS42L42_PAGE_10 + 0x0B)
#define CS42L42_SLOW_START_EN_MASK GENMASK(6, 4)
#define CS42L42_SLOW_START_EN_SHIFT 4
#define CS42L42_I2C_DEBOUNCE (CS42L42_PAGE_10 + 0x0E)
#define CS42L42_I2C_STRETCH (CS42L42_PAGE_10 + 0x0F)
#define CS42L42_I2C_TIMEOUT (CS42L42_PAGE_10 + 0x10)