[linux-dvb] Thoughts about supporting more complex tuners

[Andrew de Quincey]

OK, after consulting with Manu a bit, my original idea isn't going to work 
well. Here is an updated patch.

The initialisation sequence would now be:
struct dvb_frontend *fe = stv0299_attach();
stb6100_attach(fe);

The stb6100 attaches itself to the stv0299 using the (*attach_tuner)() 
callback.

After that, the stv0299 is then responsible for controlling the PLL - so this 
really just becomes a standardised/expanded way of how we do it already.

Main reason being - many of the enhanced demod tuning algorithms will need to 
control the tuner directly - my idea of the frontend loop doing this just 
isn't flexible enough.
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