MAXTMP_EXT
sc->sc_sensor[MAXTMP_EXT].type = SENSOR_TEMP;
strlcpy(sc->sc_sensor[MAXTMP_EXT].desc, "External",
sizeof(sc->sc_sensor[MAXTMP_EXT].desc));
maxtmp_readport(sc, MAX6690_EXT_TEMP, MAX6690_EXT_TEMP2, MAXTMP_EXT);