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Date: Fri, 29 Oct 2021 17:13:05 +0100
From: Richard Fitzgerald <rf@...nsource.cirrus.com>
To: <broonie@...nel.org>
CC: <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
<patches@...nsource.cirrus.com>,
Richard Fitzgerald <rf@...nsource.cirrus.com>
Subject: [PATCH] ASoC: cs42l42: Add control for audio slow-start switch
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@...nsource.cirrus.com>
---
sound/soc/codecs/cs42l42.c | 32 +++++++++++++++++++++++++++++++-
sound/soc/codecs/cs42l42.h | 3 +++
2 files changed, 34 insertions(+), 1 deletion(-)
diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c
index 27a1c4c73074..0d562c274292 100644
--- a/sound/soc/codecs/cs42l42.c
+++ b/sound/soc/codecs/cs42l42.c
@@ -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 +389,30 @@ 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;
+ }
+
+ snd_soc_component_update_bits(component, CS42L42_SLOW_START_ENABLE,
+ CS42L42_SLOW_START_EN_MASK, val);
+
+ return 0;
+}
+
static const char * const cs42l42_hpf_freq_text[] = {
"1.86Hz", "120Hz", "235Hz", "466Hz"
};
@@ -431,7 +457,11 @@ 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,
diff --git a/sound/soc/codecs/cs42l42.h b/sound/soc/codecs/cs42l42.h
index f45bcc9a3a62..c8b3267a318b 100644
--- a/sound/soc/codecs/cs42l42.h
+++ b/sound/soc/codecs/cs42l42.h
@@ -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)
--
2.11.0
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