DS620_REG_CONF
res = i2c_smbus_read_word_swapped(client, DS620_REG_CONF);
res = i2c_smbus_write_word_swapped(client, DS620_REG_CONF,
i2c_smbus_read_word_swapped(client, DS620_REG_CONF);
i2c_smbus_write_word_swapped(client, DS620_REG_CONF, new_conf);