cxm_saa7115_select_source
if (cxm_saa7115_select_source(sc, source) < 0)
int cxm_saa7115_select_source(struct cxm_softc *sc, enum cxm_source source);
if (cxm_saa7115_select_source(sc, cxm_tuner_source) < 0)