SI1145_REG_COMMAND
ret = i2c_smbus_write_byte_data(client, SI1145_REG_COMMAND,
ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_COMMAND,
ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_COMMAND, cmd);