[linux-dvb] [PATCH] add DVB-S2 support to frontend.h

Johannes Stezenbach js at linuxtv.org
Thu Mar 2 15:18:52 CET 2006

On Thu, Mar 02, 2006, Marcel Siegert wrote:
> On Thursday 02 March 2006 13:54, Johannes Stezenbach wrote:
> > 
> > I think FE_GET_INFO should only return the old values 0...3.
> > We can add a WARN_ON() in dvb_frontend.c to check that
> > drivers conform.
> and how will we report to an application that we have an e.g. FE_DVB_T (that would be single reported as FE_OFDM) frontend
> combined with FE_DVB_C ( that would be single reported as FE_QAM )?
> i mean if we do a return FE_OFDM | FE_QAM we will get a numeric return value of 3 that would equal an FE_ATSC in this case.
> or, should combo frontends be reported in a different kind? got any solutions already in mind?

Two mails earlier I wrote:

| FE_GET_INFO returns the default frontend type, an application
| which wants to use the new features sees the
| FE_HAS_EXTENDED_CAN_VALUES flag (bad name, IMHO), does
| FE_GET_EXTENDED_INFO (or maybe better a more generic FE_GET_CAPS
| in the style of V4 API DVB_VIDEO_GET_CAPS?), and so discovers
| the supported FE types, which it can then switch via FE_SET_STANDARD.

It means one has to pick a default. Old apps don't know
how to switch, one could add a module parameter/sysfs attribute
to the particular driver as a workaround (switch FE type,
restart legacy app).


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