Part Number: TLV320ADC6140
The tlv320adcx140 driver has a bug in the definition of adcx140_snd_controls. From the file tlv320adcx140.c line 444:
static const struct snd_kcontrol_new adcx140_snd_controls[] = {
SOC_SINGLE_TLV("Analog CH1 Mic Gain Volume", ADCX140_CH1_CFG1, 2, 42, 0,
adc_tlv),
SOC_SINGLE_TLV("Analog CH2 Mic Gain Volume", ADCX140_CH1_CFG2, 2, 42, 0,
adc_tlv),
SOC_SINGLE_TLV("Analog CH3 Mic Gain Volume", ADCX140_CH1_CFG3, 2, 42, 0,
adc_tlv),
SOC_SINGLE_TLV("Analog CH4 Mic Gain Volume", ADCX140_CH1_CFG4, 2, 42, 0,
adc_tlv),
The definition is assigning the four registers associated with channel 1 with the sound controls, as opposed to assigning the CFG1 register for each of the four channels. The correct definition should be:
static const struct snd_kcontrol_new adcx140_snd_controls[] = {
SOC_SINGLE_TLV("Analog CH1 Mic Gain Volume", ADCX140_CH1_CFG1, 2, 42, 0,
adc_tlv),
SOC_SINGLE_TLV("Analog CH2 Mic Gain Volume", ADCX140_CH2_CFG1, 2, 42, 0,
adc_tlv),
SOC_SINGLE_TLV("Analog CH3 Mic Gain Volume", ADCX140_CH3_CFG1, 2, 42, 0,
adc_tlv),
SOC_SINGLE_TLV("Analog CH4 Mic Gain Volume", ADCX140_CH4_CFG1, 2, 42, 0,
adc_tlv),
