ug_read
edata->value_cur = ug_read(sc, UG_CPUTEMP + edata->sensor)
edata->value_cur = ug_read(sc, UG_PWMTEMP)
edata->value_cur = ug_read(sc, VOLT_SENSOR);
edata->value_cur = ug_read(sc, UG_CPUFAN +
uint8_t ug_read(struct ug_softc *, unsigned short);