LTC4283_CHAN_ADIO_1
adc_idx = LTC4283_CHAN_ADIO_1 - LTC4283_CHAN_ADI_1 + pin;
if (channel >= LTC4283_CHAN_ADIO_1 && channel <= LTC4283_CHAN_ADIO_4) {
u32 bit = (channel - LTC4283_CHAN_ADIO_1) * 2;
if (channel >= LTC4283_CHAN_ADIO_1 && channel <= LTC4283_CHAN_ADIO_4) {
channel -= LTC4283_CHAN_ADIO_1;