MSC_SERIAL
uwacom_event(usbwcmp, EVT_MSC, MSC_SERIAL, sc->sc_serial[idx]);
uwacom_event(usbwcmp, EVT_MSC, MSC_SERIAL, sc->sc_serial[idx]);
BM_SET_BIT(sc->sc_bm[4], MSC_SERIAL);
BM_SET_BIT(sc->sc_bm[4], MSC_SERIAL);