[pwc] test for detecting PWC ?

[Mathieu Bouchard]

What's the correct way to detect that a V4L device is PWC ? I suppose that 
it's not sufficient to just look for "Logitech" in the device 
identification string. I can't just try PWC calls to see if they work, 
because some other driver stops working if I make a PWC call on it.
What should I do?

(BTW, I am still using the V4L1 interface. I planned to migrate to V4L2 
but still haven't)

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| Mathieu Bouchard - tél:+1.514.383.3801, Montréal QC Canada