CS8427_REG_CSDATABUF
if (udata != (chip->regmap[CS8427_REG_CSDATABUF] & udata)) {
chip->regmap[CS8427_REG_CSDATABUF] &= ~CS8427_BSEL;
chip->regmap[CS8427_REG_CSDATABUF] |= udata;
err = snd_cs8427_reg_write(device, CS8427_REG_CSDATABUF,
chip->regmap[CS8427_REG_CSDATABUF]);