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

[Steven Toth <stoth@linuxtv.org>]

Christophe Thommeret wrote:
> Le Saturday 13 September 2008 21:21:35 Steven Toth, vous avez écrit :
>>> 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
>> Fixed in the current tree.
> 
> Indeed, cache bug is now fixed, old api works as expected in all cases. (Exept 
> for the cinergyT2 case off course)

Speaking of which, I looked at this yesterday. I'll post my feedback 
back to Johannes thread, where I said I'd investigate.

> 
> However, i see that GETting DTV_DELIVERY_SYSTEM always returns the cached 
> value, so at first (after modules (re)load) it returns 0. An application 
> really needs to know the delivery system (and others usefull infos) to be 
> able to handle a device, like the old api FE_GET_INFO.
> 

Yes, talking with Darron we're talking about being able to identify the 
existence of the API and capabilities.

We have the DTV_FE_CAPABILITY_COUNT and DTV_FE_CAPABILITY (current 
defined but not connected in dvb-core) which would be the natural place 
to expose every older (and newer) feature of the demods.

The command you're referring to now does exactly what it's supposed to, 
it selects your last SET value (or if the demod has provided a 
.get_proeprty() callback), the demod could chose to answer differently. 
In principle we could add a one line fix to the cx24116 demod 
"c->delivery_system = SYS_DVBS2;" to solve your initial problem - but I 
don't that's the correct approach.

When the phase #1 work is done we'll fill out the capabilities changes 
in dvb-core and start to expose interesting features, like LNA, 
diversity, delivery systems, power controls or anything else that the 
linuxtv community thinks is generalized and useful. We will take these 
steps carefully.

- Steve


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