[RFC] [Patch] implement video driver for sur40

Hello everyone,

as promised, I've finally implemented the missing raw video feature for
the SUR40 touchscreen. Since this is a bit of a weird hybrid device
(multitouch input as well as video), I'm hoping for comments from both
communities (linux-input and linux-media). I'm also attaching the full
source code for the moment (not yet a proper patch submission) so it's
perhaps easier to get a view of the whole thing.

There's definitely some obvious cleanup still to be done (e.g. endpoint
selection), but I'd like to ask for feedback early so I can get most
issues fixed before really submitting a patch.

Thanks & best regards, Florian
-- 
SENT FROM MY DEC VT50 TERMINAL