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-rw-r--r--include/media/tuner.h21
1 files changed, 18 insertions, 3 deletions
diff --git a/include/media/tuner.h b/include/media/tuner.h
index e5321fda5489..c5994fe865a0 100644
--- a/include/media/tuner.h
+++ b/include/media/tuner.h
@@ -21,11 +21,26 @@
#include <linux/videodev2.h>
-/* Tuner PADs */
-/* FIXME: is this the right place for it? */
+/**
+ * enum tuner_pad_index - tuner pad index
+ *
+ * @TUNER_PAD_RF_INPUT: Radiofrequency (RF) sink pad, usually linked to a
+ * RF connector entity.
+ * @TUNER_PAD_OUTPUT: Tuner output pad. This is actually more complex than
+ * a single pad output, as, in addition to luminance and
+ * chrominance IF a tuner may have internally an
+ * audio decoder (like xc3028) or it may produce an audio
+ * IF that will be used by an audio decoder like msp34xx.
+ * It may also have an IF-PLL demodulator on it, like
+ * tuners with tda9887. Yet, currently, we don't need to
+ * represent all the dirty details, as this is transparent
+ * for the V4L2 API usage. So, let's represent all kinds
+ * of different outputs as a single source pad.
+ * @TUNER_NUM_PADS: Number of pads of the tuner.
+ */
enum tuner_pad_index {
TUNER_PAD_RF_INPUT,
- TUNER_PAD_IF_OUTPUT,
+ TUNER_PAD_OUTPUT,
TUNER_NUM_PADS
};