[linux-dvb] Re: Nebula card supported by bttv in 2.6-test3, but nobt878 in kerne l

[Michael Hunold <hunold@convergence.de>]

Hello Brian,

> I want to get my Nebula card working under Linux.  I've been active on 
> this list and I've tried several of the suggestions.  For some reason, 
> none of them have worked.  I've noticed that in the recent release of 
> the kernel, the Nebula Digitv card is included in bttv.  
The name entry was included by Gerd Knorr, that's right, so that the 
bttv driver recognises the device -- not more, not less. There is no 
additional functionality within bttv.

> A few days ago 
> (when I first spotted the test3 release) I tried it with the cvs release 
> of dvb-kernel.  I was not able to make a working kernel. 
dvb-kernel and test3 are very close in sync. It's possible that the 
"makelinks" approach of patching the kernel does not work at the moment. 
The Nebula driver, however, won't work unless you apply the i2c-bttv-patch.

> Has anyone 
> else been able to use this card with this kernel?  Now that there is 
> bttv support, will the bt878 driver be included in future kernel 
> releases?  Will there be patches?  
The problem is, that the i2c-bttv patch is refused by Gerd Knorr. But 
IMHO Gerd is correct, the patch is hackish: it exports the i2c interface 
of the bttv driver, so that the DVB i2c stuff can use it. This is likely 
to introduce bugs and races.

> Is there anything I can do to speed
> up the process/ what needs to be done?

bttv exports the i2c adapter via the sysfs -- somewhat similar to 
procfs, but better, have a look at Documentation/filesystems/sysfs.txt.

So it should be possible to replace the calls to the hackish 
"give-me-the-i2c-adapter" function and get access to the i2c adapter via 
the sysfs interface instead.

So someone with a Nebula card, a recent test3 kernel and knowledge about 
sysfs and kernel development should be able to get it work.

I wrote a private mail to the driver author, but I did not receive an 
answer yet. Perhaps he's busy, I've included him as CC, so perhaps he 
can tell us if he can look after this.

> -Brian
CU
Michael.



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