[linux-dvb] Re: Nova-CI: why does opening /dev/dvb/adapter0/ca0 return "no such device?"

["Robert Schlabbach" <robert_s@gmx.net>]

From: "Johannes Stezenbach" <js@convergence.de>
> I'm sorry to have to disappoint you, but the common interface is
> not supported because we have no information from the vendor how
> it works. I added a note to Kconfig accordingly.

FWIW, I'll probably soon start reverse engineering the budget CI to
implement support in my Windows BDA minidriver. If any Linux programmer is
interested in implementing support for Linux, contact me and we can help
each other.

What I have figured out so far: The MPEG-2 transport stream looped back
from the CI is routed to port A of the SAA7146A. So switching from the
direct stream to the decoded stream would be as simple as reprogramming the
BRS configuration register, i.e. a single register write (plus a write to
upload the register).

The CI control seems to be wired to the SAA7146A DEBI port. I know very
little about the CI protocol, it seems to be a rather complex beast :( But
at least the low-level hardware access should be simple enough to figure
out. The hard part is understanding the CI protocol enough to tell if the
responses you get are correct, but that's pretty unrelated to the actual
hardware implementation task...

Regards,
--
Robert Schlabbach
e-mail: robert_s@gmx.net
Berlin, Germany



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