USB Device programming

I need to make an application(running on LINUX) that is intended to work for USB cameras. The application needs to control the camera activities and must be able to set the various configurable options and features.
Acc. to what I read about USB device drivers etc. I got to know that the USB file system is automatically mounted to /proc/bus/usb
The questiion that I have is - How to access and control the USB device (camera) ?? If the driver's API is not available ...is it still possible??
Also can someone give some pointers to some sources where some programming samples are given to program any type of USB device!!

-Aayush
(P.S: I am specifically told not to use apps like GPhoto and similar)
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aayushpuriAsked:
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sunnycoderConnect With a Mentor Commented:
>If the driver's API is not available ...is it still possible??
Yes ... Just that you will have to write the code to control and interface with the device

http://www.lvr.com/usb.htm
http://www.lvr.com/usbcode.htm
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stefanocCommented:
I think that a good starting point could be libusb (http://libusb.sourceforge.net/). It is library that defines an API to access USB device directly from use space. Unfortunately current version doesn't work with ISOCHRONOUS trasfers that are the most used in cameras, but you can try with your camera.
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Karl Heinz KremerConnect With a Mentor Commented:
The Linux Journal had a series of articles about how to program USB devices (and some information about reverse engineering unknown protocols).

http://www.linuxjournal.com/article.php?sid=7353
http://www.linuxjournal.com/article.php?sid=7466
http://www.linuxjournal.com/article.php?sid=7582

And another article that's a bit older:
http://www.linuxjournal.com/article.php?sid=4786
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