SC16IS7XX_REGISTER_IOSTATE
error = sc->sc_funcs->read_reg(sc, SC16IS7XX_REGISTER_IOSTATE, 1, &r, 1);
error = sc->sc_funcs->read_reg(sc, SC16IS7XX_REGISTER_IOSTATE, 1, &r, 1);
error = sc->sc_funcs->write_reg(sc, SC16IS7XX_REGISTER_IOSTATE, 1, &r, 1);