acpitz_getreading
sc->sc_psv = acpitz_getreading(sc, "_PSV");
sc->sc_ac[i] = acpitz_getreading(sc, name);
acpitz_getreading(sc, name);
sc->sc_tc1 = acpitz_getreading(sc, "_TC1");
sc->sc_tc2 = acpitz_getreading(sc, "_TC2");
tmp = acpitz_getreading(sc, name);
int acpitz_getreading(struct acpitz_softc *, char *);