[linux-dvb] Re: Twinhan CA

[Manu Abraham <manu@kromtek.com>]

On Mon November 22 2004 1:29 pm, olivier wrote:
> Manu Abraham <manu@kromtek.com> disait récemment :
> > Hi,
>
> Hi,
>
> > Well timing issues mostly solved, Conditional Access ah, most of the SI
> > parsing is done by Twinhan in the driver. To make it simple the Twinhan
> > driver does  get the SI from the DMA buffer, which is similar to the ring
> > buffer as per the Linux DVB API.
>
> Yes, this is horrible :/
>
> > Since originally the demarcation between the frontend and CA device was
> > null, i initially used the frontend device itself as the conditional
> > access device, but later on moved to register /dev/dvb/adapterX/ca0 for
> > the device.
>
> How this device is used by  the userspace program ?  Do you have ioctl
> and CA_GET/SET_MSG or read/write ioctl ?
Currently i have two sets.
But i used CI_SET temporarily, to test out, 

>
> > 1)A complete solution would be libdvb or libdvb2 itself.
> >
> > There is a place-holder for libdvb2 at linuxtv, eventhough no
> > developments has undergone so far.
>
> You can use cam_set and cam_test from LIBDVB 0.5.5
> (http://www.metzlerbros.org/dvb/).
>
> The file cam_set/libdvbsi/ci.cc implements full EN50221 protocol, just
> cut what is not needed for twinhan. This is what I've done.
Problem is i can read CPP somewhat, but not write : (

>
> > 2)Another solution would be to hack scan to a certain extent to harvest
> > information from SI, and set these parameters through *zap.
>
> 3) Hard-code some  ca_descriptor in the driver, this  should be enough
>    for testing.
That's what i did to watch, The Movie Channel on Showtime.

>
> Anyway, I'm very interested by  getting your working driver now. Maybe
> I'll be able to help you.

Just hold on, some little work more, i will clean up my code and post.

Manu
>
> Olivier