USB_CDC_CM_OVER_DATA
sc->sc_cm_cap & USB_CDC_CM_OVER_DATA ? "" : "no ",
sc->sc_cm_cap & USB_CDC_CM_OVER_DATA ? "" : "no ",
if (sc->sc_cm_cap & USB_CDC_CM_OVER_DATA) {
*cm = USB_CDC_CM_DOES_CM | USB_CDC_CM_OVER_DATA;