[linux-dvb] DVB-CA slot types

[Andrew de Quincey <adq_dvb@lidskialf.net>]

ca.h defines the following types of CA slot device. I'm not sure what they're 
meant to be:


CA_CI
A "higher layer" interface. I don't know what this would correspond to... 
maybe the EN50221 transport layer?

CA_CI_LINK
This sounds like it would correspond to the EN50221 link layer... i.e. the 
data would consist of multiple interleaved fragmented packets.

CA_CI_PHYS
This sounds like it would be for hitting the EN50221 hardware directly (i.e. 
twiddling the bits on the EN50021 physical interface).

CA_SC
Simple smartcard reader.

The linuxtv tree (not the metzler tree) also defines:
CA_DESCR
Which is a built in descrambler.


I can't have this quite right; the AV7110 CA driver in the metzler tree says 
it is a CA_CI_LINK, yet it takes transport layer EN50221 packets.... from my 
thinking (which is likely wrong) this should really have another type 
CA_CI_TRANSPORT.

Can someone clear my confusion up please?

Also, in ca_caps, what are descr_num and descr_type meant to be? Are they only 
meant to be set for certain types of interface, because there's certainly 
nothing they correspond to at the level I'm looking at.


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