Hello,

after having had a rapid look at UVC driver internals, I saw that the 
read() system call has not been implemented yet, while poll() is
implemented and can be called from userspace.

Apart from the V4L2 API, given that poll() is a standard
system call and is supposed to be closely tied to non-blocking reads()
to provide a _standard_ I/O mechanism for retrieving data, are there
any reasons for not providing read() as well together with poll(),
as it's probably confusing to have partial support for this
I/O interface?

Best regards
Luca
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