mpu401_init
sc->mpu = mpu401_init(&dummy_mpu_class, sc, dummy_chan_io,
mpu401_init(kobj_class_t _cls, void *cookie, driver_intr_t *_softintr,
sc->mpu = mpu401_init(&cmi_mpu_class, sc, cmi_intr, &sc->mpu_intr);
scp->mpu = mpu401_init(&csamidi_mpu_class, scp, csamidi_midi_intr,
sc->mpu = mpu401_init(&emu_mpu_class, sc, emu_intr2, &sc->mpu_intr);
scp->mpu = mpu401_init(&emu_mpu_class, scp, emu_midi_intr, &scp->mpu_intr);