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I have recently bought a Logitech Quickcam Connect and started looking for documentation for it. It turns out that this specific web cam does not follow the USB Video Class Protocol, instead it has a zc030x chipset. The Linux driver project that covers this chipset is found on http://mxhaard.free.fr/ (at the moment I am trying to read through their code). However on their site, I could not find the documentation for the zc030x chipset although there was documentation for lots of other supported chipsets. Google searches were futile and the company website had nothing ( I am still waiting for a reply from them).
I would like to know :
1- Is there any place at all I can find the documentation?
2- If anyone has experience with this chipset, how did you write a driver for it (if you did)?
3- Is there a similar chipset with documentation available?
4- Anything else that might be helpful.

Thanks in advance,
TehFool

start with datasheets and application notes from the manufacturer

If someone else has some ideas or suggestions jump in and post!

Just an idea. If it was me I would start with:
\gspcav1-20071224\Vimicro\zc3xx.h
Lot of static functions that seem very specifc to the chipset.

Although, it may lack a lot of description as to what it is doing exactly you
could still use it to get a lot further if you are unable to find any documentation.

I had the same problem with the FTDI chipset for serial over USB, but it had a
bunch of documentation. Hopefully, you find some more documentation.

Here is the interface to the USB bus from the code.. just a place to start.