[linux-dvb] Re: mods to bt878.c

[Holger Waechtler <holger@convergence.de>]

Hi Mark,

Mark Edwards wrote:
> Holger et al...
>  
> as per my recent post I have encountered a problem with coexistence of 
> bt878.o and btaudio.o
>  
> both modules happily go grabbing all bt878 audio channels on all bt878 
> cards they can find as soon as they load up. This basically means that a 
> bt878 analogue card and bt878 DVB card can't coexist.
>  
> I'd like to propose a general fix for this which would have to include 
> the assumption that people will - for some bizarre reason known only to 
> themselves - want to use an analogue and a digital card in the same server.
>  
> The fix is to update the pci_device_id structure in bt878.c based on the 
> premise that there are far fewer bt878 DVB cards around than there are 
> analogue tv cards. This would of course mean generating a registry of 
> bt878 DVB card PCI ID's. Fortunately the Avermedia guys were kind enough 
> to use the subvendor and subdevice ID's which is how I am picking up the 
> card in my patched bt878. I am not sure what the situation is for other 
> bt878 based DVB cards. Any idea?
>  
> FYI the Avermedia DVB-T is
>  
> .subvendor=0x1461
> .subdevice=0x0761
>  
> It works a treat if you patch bt878 with the id's above (replacing 
> PCI_ANY_ID), then load the bt878.o module _before_ btaudio.o
>  
> If you're Ok with this approach, I'll put out a call for anyone with a 
> BT878 based DVB card to send me their lspci -vn output and I'll capture 
> them for future reference if you like.
I added Gerd Knorr and Jamie to the CC: list, both are currently working 
on merging the analog and digital bttv driver, this problem is probably 
a pretty related issue. I suppose both btaudio.o and the bt8xx-dvb 
driver should only attach to the cards they can handle for sure, this 
should be dependent on both subvendor and device id.

Holger



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