[linux-dvb] [PATCH] wscan: improved frontend autodetection

wk handygewinnspiel at gmx.de
Thu Nov 6 17:32:25 CET 2008


Hi,

Hans Werner wrote:
> Currently wscan will not autodetect frontends which which have frontend != 0,
> i.e. it only detects /dev/dvb/adapterN/frontend0 where N=0-3.
>
> Since multiple frontends per adapter are supported in 2.6.28, this means the correct
> frontend may not be found. For example with the HVR4000, DVB-T is always at frontend1.
>
> The attached patch fixes this, searching for frontend 0-3 for each adapter 0-3.
>
> Signed-off-by: Hans Werner <hwerner4 at gmx.de>
Good idea. :)
But while testing your patch it seems that it doesn't work as expected. 
Here some example:

w_scan version 20081106
Info: using DVB adapter auto detection.
   Found DVB-C frontend. Using adapter /dev/dvb/adapter0/frontend0
   Found DVB-C frontend. Using adapter /dev/dvb/adapter1/frontend0
   Found DVB-C frontend. Using adapter /dev/dvb/adapter2/frontend0
Info: unable to open frontend /dev/dvb/adapter3/frontend1'
Info: unable to open frontend /dev/dvb/adapter3/frontend2'
Info: unable to open frontend /dev/dvb/adapter3/frontend3'
-_-_-_-_ Getting frontend capabilities-_-_-_-_

I'm using three dvb-c frontends.
The detection doesnt stop anymore with your patch if a matching frontend 
was found, because it doesnt leave the outer loop.
Normally this search has to stop at /dev/dvb/adapter0/frontend0.
That means we have to change your patch a little. I also increased the 
number of adapters to 8, since i use more than 4.

Can you please test the attached patch and give some feedback? If it 
works fine for you, i would apply to w_scan.

-Winfried

PS: What is actually the maximum number of adapters and frontends per 
adapter? Can anybody give some hint?


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