AD1816A_ADC_SOURCE_SEL
val = snd_ad1816a_read(chip, AD1816A_ADC_SOURCE_SEL);
change = snd_ad1816a_read(chip, AD1816A_ADC_SOURCE_SEL) != val;
snd_ad1816a_write(chip, AD1816A_ADC_SOURCE_SEL, val);