ABS_WHEEL
uwacom_event(usbwcmp, EVT_ABS, ABS_WHEEL, abs);
uwacom_event(usbwcmp, EVT_ABS, ABS_WHEEL, rot);
BM_SET_BIT(sc->sc_bm[3], ABS_WHEEL);
uwacom_init_abs(usbwcmp, ABS_WHEEL, 0, 71, 0, 0);