[linux-dvb] Re: CX88 i2c issue w/ DVB tuners

[Holger Waechtler <holger@qanu.de>]

Andrew de Quincey wrote:

> On Thursday 09 Sep 2004 16:18, Holger Waechtler wrote:
>  
> > Andrew de Quincey wrote:
> >    
> > > Tum te tum, another small issue with cx88 - the i2c_adap class was always
> > > set to I2C_CLASS_TV_ANALOG. Which meant if you happened to have the
> > > tda9887 analogue tuner loaded, it (incorrectly) grabbed the i2c device
> > > that the cx22702 uses.
> > >
> > > Attached patch sets the cx88 i2c bus class to I2C_CLASS_TV_DIGITAL if the
> > > "dvb" flag is set.
> > >
> > > Incidentally, shouldn't all the DVB tuners check the bus class is
> > > definitely I2C_CLASS_TV_DIGITAL? Otherwise you might end up with the
> > > reverse problem (cx22702 etc taking over the tda9887's i2c device on
> > > analogue cards).
> > >
> > > Just hope there isn't a card out there with both DVB AND analogue tuners
> > > on it....
> > >      
> > Some ATSC cards and some modern Reference Designs of major chip vendors
> > can receive both digital and analog broadcasts. It's just a matter of
> > time until they become widely available.
> >    
> Hmm, yuck. Well we'll just have to sort that out when it happens. 
>  
It already happened: the oldest DVB card available, the Siemens-DVB-C 
card receives both analog and digital transmission. At least the 
hardware and the Windows driver is able to do so. Don't know about the 
Linux driver state.

Holger