ami_drv_pt
int ami_drv_pt(struct ami_softc *, u_int8_t, u_int8_t, u_int8_t *,
error = ami_drv_pt(sc, ch, tg, cdb, 6, sizeof *inq, inqbuf);
error = ami_drv_pt(sc, ch, tg, cdb, 10, sizeof(*rcd), rcd);
error = ami_drv_pt(sc, ch, tg, cdb, 16, sizeof(*rcd16), rcd16);