[linux-dvb] Re: CI implementation question

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

On Friday 23 January 2004 17:56, Johannes Stezenbach wrote:
> Andrew de Quincey wrote:
> > Out of interest, if a CI module has two slots, and you're using
> > read()/write() to communicate, how do you know which slot to talk to?
> >
> > The ca.h in the linuxtv dvb-kernel implies that there is ONE ca device
> > for each CI module, and you select the slot you want when you send the
> > IOCTLS.... whereas if you're using read/write it would be more natural to
> > create a seperate ca devive for each slot..?
>
> The API isn't clearly defined, but each write() takes / read() delivers:
>
> - 1 byte slot number
> - 1 byte transport connection id
> - and one complete TPDU
>
> IMHO the ioctl() API is cleaner, but the av7110 driver implemented read()
> write() instead, and thus this is used by VDR and the Metzler's libdvbci.

OK, cool. I'll do both in that case.


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