[linux-dvb] S2API - Status - Thu Sep 11th

Christophe Thommeret hftom at free.fr
Sun Sep 14 20:04:06 CEST 2008

Le Sunday 14 September 2008 18:47:00 Steven Toth, vous avez écrit :
> Steven Toth wrote:
> > Johannes Stezenbach wrote:
> >> On Fri, Sep 12, 2008, Steven Toth wrote:
> >>> Christophe Thommeret wrote:
> >>>> As far  as i understand, the cinergyT2 driver is a bit unusual, e.g.
> >>>> dvb_register_frontend is never called (hence no dtv_* log messages).
> >>>> I don't know if there is others drivers like this, but this has to
> >>>> be investigated cause rewritting all drivers for S2API could be a
> >>>> bit of work :)
> >>>>
> >>>> P.S.
> >>>> I think there is an alternate driver for cinergyT2 actually in
> >>>> developement but idon't remember where it's located neither its state.
> >>>
> >>> Good to know. (I also saw your followup email). I have zero
> >>> experience with the cinergyT2 but the old api should still be working
> >>> reliably. I plan to investigate this, sounds like a bug! :)
> >>
> >> Holger was of the opinion that having the demux in dvb-core
> >> was stupid for devices which have no hw demux, so he
> >> programmed around dvb-core. His plan was to add a
> >> mmap-dma-buffers kind of API to the frontend device,
> >> but it never got implemented.
> >>
> >> Anyway, it's bad if one driver is different than all the others.
> >
> > Hmm, I didn't realize this, good to know.
> >
> > Now it's peaked my interest, I'll have to look at the code.
> >
> > The existing API should still work at a bare minimum, if it's not - it
> > needs to.
> So I looked the the cinergyT2 code, that's a complete eye-opener. It has
> it's own ioctl handler, outside of dvb-core.
> It's a good news / bad news thing.
> The good news is that this driver will not be effected by the S2API
> changes, so nothing can break.
> The bad news is that this driver will not be effected by the S2API
> changes, so it doesn't get the benefit.
> Regardless of S2API or multiproto, I see no reason why we shouldn't
> bring this driver back into dvb-core.
> I don't have a device to test, but here's a patch (0% tested, with bugs
> probably) that converts the module back to a regular dvb-core compatible
> device, so the S2API would work with this. If anyone wants to test this,
> and finds bugs - I won't get back to this driver for a couple of weeks -
> so your patches would be welcome. :)
> Frankly, is S2API is selected for merge and we have enough users of the
> current non-dvb-core driver, I'll probably re-write it from the spec.
> So much to do, so little time.
> - Steve


as you expected, it's abit buggy and crashes at load ;)
i've searched for the alternative cinergyT2 driver.
it's available at: http://linuxtv.org/hg/~tmerle/cinergyT2/

haven't tried it yet but will do (at least several people seems to have it 

Christophe Thommeret

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