> 
> > card without signal support should return a 0 as maximun 
> signal and digital
> > signal card (noise or signal) should return 1.
> > 
> 
> Sounds sensible - some other cards basically do this, or even 
> abuse stereo
> detect bits to guess signal present
> 
Yes but seem no method to tell program the signal range. 
I think best (and compatible method) is add an V4L2_CID_TUNER_SIGNAL (or
something else) to VIDIOC_QUERYCTRL ioctl.

freddy77



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