ADS1298_REG_CHnSET
ret = regmap_update_bits(priv->regmap, ADS1298_REG_CHnSET(chan_index),
ret = regmap_read(priv->regmap, ADS1298_REG_CHnSET(channel), ®val);
ret = regmap_update_bits(priv->regmap, ADS1298_REG_CHnSET(i),