// tvaudio.c deliberately reuses these in a non conventional way V4L2_TUNER_MODE_MONO 0 V4L2_TUNER_MODE_STEREO 1 V4L2_TUNER_MODE_LANG2 2 V4L2_TUNER_MODE_SAP 2 V4L2_TUNER_MODE_LANG1 3 V4L2_TUNER_MODE_LANG1_LANG2 4 MBX_INTERRUPT 1