[linux-dvb] dvb/v4l: what's that with the tuners?

[Guido Draheim <guidod-2003-@gmx.de>]

I am currently debugging problems of `zapping` v4l viewer with the
current dvb/cvs drivers. At the moment I do not quite understand
the sourcecode, it seems just WRONG to me.

in drivers/av7110/av7110.c
(a) VIDIOCGCHAN
    here we return
       struct video_channel dvb_chan = { 0, "DVB", 1, 3, 1, 1 };
   where the third item (= 1) says "we have 1 tuner".
(b) the `zapping` applications does now think it should try to
    tune the card to the last freq. (if it would be 0 then it
    would just return on the exec path right there). First it
    does check the current range of the tuner, and therefore
(c) VIDIOCGTUNER
    here we see however:
                /* only channel 0 has a tuner */	
                if(!v->tuner)
                        return -EINVAL;
    that looks plain wrong,
    so I decided to patch it up as
                /* only channel 0 has a tuner */	
                if(v->tuner)
                        return -EINVAL;
(d) now the `zapping` app gets over this part, and tries to
    actually...
(e) VIDIOCSFREQ
    which fails obviously since that ioctl values is not
    handled anywhere, and so it fails here.

what's the reason behind this setup?
-- guido                                  http://google.de/search?q=guidod
GCS/E/S/P C++/++++$ ULHS L++w- N++@ d(+-) s+a- r+@>+++ y++ 5++X- (geekcode)



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