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

Steven Toth stoth at linuxtv.org
Fri Sep 12 16:08:30 CEST 2008

Christophe Thommeret wrote:
> 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
>> 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.

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! :)


- Steve

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