Add decimation filter selection support.
Per Section 8.3.6.7 the Digital Decimation Filter is selectable between
a Linear Phase, Low Latency, and Ultra Low Latency filer.
Signed-off-by: Dan Murphy <dmurphy@xxxxxx>
---
sound/soc/codecs/tlv320adcx140.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/sound/soc/codecs/tlv320adcx140.c b/sound/soc/codecs/tlv320adcx140.c
index 105e51be6fe6..93a0cb8e662c 100644
--- a/sound/soc/codecs/tlv320adcx140.c
+++ b/sound/soc/codecs/tlv320adcx140.c
@@ -169,6 +169,17 @@ static DECLARE_TLV_DB_SCALE(agc_thresh_tlv, -3600, 200, 0);
/* AGC Max Gain. From 3 dB to 42 dB in 3 dB steps */
static DECLARE_TLV_DB_SCALE(agc_gain_tlv, 300, 300, 0);
+static const char * const decimation_filter_text[] = {
+ "Linear Phase", "Low Latency", "Ultra-low Latency"
+};
+
+static SOC_ENUM_SINGLE_DECL(decimation_filter_enum, ADCX140_DSP_CFG0, 4,
+ decimation_filter_text);
+
+static const struct snd_kcontrol_new decimation_filter_controls[] = {
+ SOC_DAPM_ENUM("Decimation Filter", decimation_filter_enum),
+};
+
static const char * const resistor_text[] = {
"2.5 kOhm", "10 kOhm", "20 kOhm"
};
@@ -404,6 +415,9 @@ static const struct snd_soc_dapm_widget adcx140_dapm_widgets[] = {
in3_resistor_controls),
SND_SOC_DAPM_MUX("IN4 Analog Mic Resistor", SND_SOC_NOPM, 0, 0,
in4_resistor_controls),
+
+ SND_SOC_DAPM_MUX("Decimation Filter", SND_SOC_NOPM, 0, 0,
+ decimation_filter_controls),
};
static const struct snd_soc_dapm_route adcx140_audio_map[] = {
@@ -418,6 +432,10 @@ static const struct snd_soc_dapm_route adcx140_audio_map[] = {
{"CH3_ASI_EN", "Switch", "CH3_ADC"},
{"CH4_ASI_EN", "Switch", "CH4_ADC"},
+ {"Decimation Filter", "Linear Phase", "DRE_ENABLE"},
+ {"Decimation Filter", "Low Latency", "DRE_ENABLE"},
+ {"Decimation Filter", "Ultra-low Latency", "DRE_ENABLE"},
+
{"DRE_ENABLE", "Switch", "CH1_DRE_EN"},
{"DRE_ENABLE", "Switch", "CH2_DRE_EN"},
{"DRE_ENABLE", "Switch", "CH3_DRE_EN"},
--
2.25.0
