AS73211_REG_CREG1
ret = i2c_smbus_write_byte_data(data->client, AS73211_REG_CREG1, data->creg1);
ret = i2c_smbus_write_byte_data(data->client, AS73211_REG_CREG1, data->creg1);
ret = i2c_smbus_read_byte_data(data->client, AS73211_REG_CREG1);