Commit 5c9077ea authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab

[media] v4l2-mc.h: Split audio from baseband output

Analog TV tuners have a separate output pad for the audio
IF or audio sampled data. This pad is connected to a different
chipset.

Add an extra pad for it and improve the documentation.
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
parent 6aad127d
......@@ -698,6 +698,7 @@ static int tuner_probe(struct i2c_client *client,
#if defined(CONFIG_MEDIA_CONTROLLER)
t->pad[TUNER_PAD_RF_INPUT].flags = MEDIA_PAD_FL_SINK;
t->pad[TUNER_PAD_OUTPUT].flags = MEDIA_PAD_FL_SOURCE;
t->pad[TUNER_PAD_AUD_OUT].flags = MEDIA_PAD_FL_SOURCE;
t->sd.entity.function = MEDIA_ENT_F_TUNER;
t->sd.entity.name = t->name;
......
......@@ -19,20 +19,26 @@
*
* @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_PAD_OUTPUT: Tuner video output source pad. Contains the video
* chrominance and luminance or the hole bandwidth
* of the signal converted to an Intermediate Frequency
* (IF) or to baseband (on zero-IF tuners).
* @TUNER_PAD_AUD_OUT: Tuner audio output source pad. Tuners used to decode
* analog TV signals have an extra pad for audio output.
* Old tuners use an analog stage with a saw filter for
* the audio IF frequency. The output of the pad is, in
* this case, the audio IF, with should be decoded either
* by the bridge chipset (that's the case of cx2388x
* chipsets) or may require an external IF sound
* processor, like msp34xx. On modern silicon tuners,
* the audio IF decoder is usually incorporated at the
* tuner. On such case, the output of this pad is an
* audio sampled data.
* @TUNER_NUM_PADS: Number of pads of the tuner.
*/
enum tuner_pad_index {
TUNER_PAD_RF_INPUT,
TUNER_PAD_OUTPUT,
TUNER_PAD_AUD_OUT,
TUNER_NUM_PADS
};
\ No newline at end of file
};
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