UATP_MAX_Y_SENSORS
memset(uatp_y_sample(sc), 0, UATP_MAX_Y_SENSORS);
#define UATP_SENSORS (UATP_MAX_X_SENSORS + UATP_MAX_Y_SENSORS)
(sc->sc_knobs.y_sensors <= UATP_MAX_Y_SENSORS))
KASSERT(sc->sc_parameters->y_sensors <= UATP_MAX_Y_SENSORS);