[linux-dvb] Re: V4 CI API

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

On Wednesday 14 April 2004 15:31, Johannes Stezenbach wrote:
> I have some doubts about the current V4 CI API draft.
>
> I still think that the ioctl/message style is easier to
> understand than the read/write approach. But I think
> that it is better to handle multiple slots in one
> CI device and pass the slot number explicitly, just
> like in the V3 API.

It would probably make it easier from a driver point of view.. certainly if 
the budget-ci supported multiple slots, both of them would be competing for 
the same hardware interface.

It adds a little complication to userspace code, but nothing particularly 
bad.... and it does reflect how the actual hardware on the card is 
implemented.

> IIRC it was also discussed on the list that we need to
> support different CI message protocols, like link layer
> and transport layer (or maybe even more). True?

Ralph Metzler said this was necessary for cards which operate at a higher 
protocol level.... I think it might have been the Twinhan cards that are like 
this.

Also, I suppose Convergence might still use the descriptor interface in their 
internal developments.


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