The attached patch (vs. 2.6.7) adds the missing sysfs support to the CPiA driver by adding the needed remove() function.
This avoids the current kernel warnings:
videodev: "CPiA Camera" has no release callback. Please fix your driver for proper sysfs support, see http://lwn.net/Articles/36850/

Tested with a CPiA USB webcam. 
Please apply.

Helge