CALIBRATION_REG3
reg3_orig = i2c_smbus_read_byte_data(client, CALIBRATION_REG3);
CALIBRATION_REG3, reg3);
error = i2c_smbus_write_byte_data(client, CALIBRATION_REG3,
error = i2c_smbus_write_byte_data(client, CALIBRATION_REG3,