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@ti.com --- 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"},