On 01/11/2015 04:25 PM, Mauro Carvalho Chehab wrote:
Em Sun, 11 Jan 2015 16:02:41 +0200
Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> escreveu:
I'm not too familiar with tuners, do they all have a single output only and no
input ?
They have an input: the antenna connector. However, I don't see any need
to map it for most tuners, as there's generally just one input, hardwired
into the tuner chip.
There are some hardware with 2 antenna connectors, but for different
functions (FM and TV). They're selected automatically when the V4L2
driver switches between FM and TV.
In any case, the tuner-core doesn't provide any way to select the
antenna input.
So, if a driver would need to select the input, it would either need
to not use tuner-core or some patch will be required to add such
functionality inside tuner-core.
Tuner has antenna as a input and output is intermediate frequency or
baseband (IF/BB (zero-IF)).
I think most modern silicon tuners actually has more than one physical
antenna inputs - but those are left unused or same physical antenna
connector is wired to all those inputs.
Sooner or later there will be receiver having multiple antenna
connectors which are selectable by software. So let it be at least
option easy to add later.
regards
Antti
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