AD4170_GAIN_REG
[AD4170_OFFSET_REG(0) ... AD4170_GAIN_REG(0)] = 3,
[AD4170_OFFSET_REG(1) ... AD4170_GAIN_REG(1)] = 3,
[AD4170_OFFSET_REG(2) ... AD4170_GAIN_REG(2)] = 3,
[AD4170_OFFSET_REG(3) ... AD4170_GAIN_REG(3)] = 3,
[AD4170_OFFSET_REG(4) ... AD4170_GAIN_REG(4)] = 3,
[AD4170_OFFSET_REG(5) ... AD4170_GAIN_REG(5)] = 3,
[AD4170_OFFSET_REG(6) ... AD4170_GAIN_REG(6)] = 3,
[AD4170_OFFSET_REG(7) ... AD4170_GAIN_REG(7)] = 3,
ret = regmap_write(st->regmap, AD4170_GAIN_REG(setup_num), setup->gain);