TCTRL_APM_CTLOPEN
if (sc->sc_flags & TCTRL_APM_CTLOPEN)
sc->sc_flags |= TCTRL_APM_CTLOPEN;
sc->sc_flags &= ~TCTRL_APM_CTLOPEN;
if ((sc->sc_flags & TCTRL_APM_CTLOPEN) &&
return(sc->sc_flags & TCTRL_APM_CTLOPEN) ? 0 : 1;