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

Christophe Thommeret hftom at free.fr
Fri Sep 12 15:31:26 CEST 2008


Le Friday 12 September 2008 15:29:41 Christophe Thommeret, vous avez écrit :
> Le Friday 12 September 2008 15:18:38 Steven Toth, vous avez écrit :
> > Christophe Thommeret wrote:
> > > Le Friday 12 September 2008 07:51:17 Steven Toth, vous avez écrit :
> > >> Hello!
> > >>
> > >> More progress today, 7 new patches were merged - all related to the
> > >> feedback and suggestions we had.... And a bugfix. :)
> > >>
> > >> The DTV_SET/GET command syntax has been rationalised, as Hans
> > >> requested. This cleans up the application API nicely. Various internal
> > >> improvements and code cleanup related to variable length arrays,
> > >> moving values to/from userspace to the kernel. Interfacing to the
> > >> demods to allow them to interact with set/get property requests, if
> > >> they chose to do so. Quite a lot of changes internally and to the user
> > >> facing API.
> > >>
> > >> If you're planning to test then you'll need the tune-v0.0.5.c to see
> > >> the different. (steventoth.net/linux/s2/tune-v0.0.5.tgz)
> > >>
> > >> In addition, some related news:
> > >>
> > >> mkrufky spent some time adding S2API isdb-t support to the siano
> > >> driver, that's working pretty well - tuning via the S2API app.
> > >>
> > >> Two tree here, offering slightly different approaches, one with S2API,
> > >> one using some spare bits in the DVB-T tuning fields.
> > >>
> > >> http://linuxtv.org/hg/~mkrufky/sms1xxx-s2api-isdbt/
> > >> http://linuxtv.org/hg/~mkrufky/sms1xxx-isdbt-as-dvbt/
> > >>
> > >> (See tune-v0.0.5.tgz for example ISDB-T tuning code)
> > >>
> > >> If you're interested in seeing the impact of switching to S2API for
> > >> this driver, see the set_frontend() func, it's a small change - just a
> > >> few lines to reference the dtv_frontend_properties cache.
> > >>
> > >> I don't think we're quite ready to announce we've conquered the
> > >> complete ISDB-T API, so don't assume that this is concrete.... As we
> > >> experiment with other ISDB-T products we'll probably find reasons to
> > >> tweak the API a little further as a standard begins to form..... but
> > >> tuning through a clean API is a great step forward, and its working
> > >> now, today. Thank you mkrufky :)
> > >>
> > >> Hans Werner sent a large patch for the multifrontend HVR3000/HVR4000
> > >> combined DVB-T/DVB-S/S2 support for the S2API tree. (Thanks Hans -
> > >> this was obviously a lot of manual merge work, it's greatly
> > >> appreciated.)
> > >>
> > >> What would everyone like to see happen with this patch?
> > >>
> > >> Would you prefer to see this dealt with outside of the S2API
> > >> discussion, or would you like to see this included and merged? Let me
> > >> know your thoughts. Andreas also has the multifrontend thread running,
> > >> so comment here if you would like to see this as part of the S2API
> > >> patches, or comment on the Andreas thread of you want this as a
> > >> separate patchset at a later date.
> > >>
> > >> Darron Broad has offered to bring the cx24116.c driver up to date with
> > >> some additions he has in his repositories. With any luck we may see
> > >> these merged into the current cx24116 driver within a few days. Thank
> > >> you Darron.
> > >>
> > >> Patrick, I haven't looked at your 1.7MHz bandwidth suggestion - I'm
> > >> open to ideas on how you think we should do this. Take a look at
> > >> todays linux/dvb/frontend.h and see if these updates help, or whether
> > >> you need more changes.
> > >>
> > >> Igor has been busy patching the szap-s2 tool
> > >> (http://liplianindvb.sourceforge.net/hg/szap-s2/) so many thanks to
> > >> Igor! Gregoire has been running some basic tests and appears to be
> > >> having some success, that's encouraging. Thank you.
> > >>
> > >> What's next?
> > >>
> > >> Now's probably a good time to start patching dvb-apps. I think the
> > >> frontend.h changes are close enough for that work to begin. This will
> > >> probably start Friday, so keep your eyes and open for the
> > >> stoth/s2api-dvb-apps tree appearing ... and an announcement here.
> > >>
> > >> Thanks again to everyone, your efforts are appreciated!
> > >>
> > >> Regards,
> > >>
> > >> Steve
> > >
> > > Good work.
> > > I've just gave it a try:
> > >
> > > First i tried old api (kaffeine)-> everything works as expected.
> > > Then i tried new API (with latest tune.c) -> nova-t and nova-s work,
> > > cinergyT2 doesn't. I've also noticed that FE_SET_PROPERTY ioctl always
> > > return -1, even when success..
> > > Then i tried old api again -> now dvb-s doesn't lock and dvb-t always
> > > lock on the freq used in tune.c

Forgot to say that cinergyT2 always work with old api

> >
> > Christophe, thanks for the feedback. I'm not familiar with the cinergyT2
> > driver so I'll look into this tonight and see what's causing the tuning
> > to fail.
> >
> > Thanks for highlighting this.
>
> 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.


-- 
Christophe Thommeret




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