The solution was simple: add my user to the 'camera' unix group.
The things that tripped me up were:
- I had the misconception that my camera supported both USB mass storage and the PTP protocol. The truth is it only supports PTP. So the fact that UDEV was never told about the kernel creating a device such as "/dev/sda1" for the camera wasn't a problem after all - no such device ought to be created for this camera model.
- I didn't realize that if you're going to access a camera via PTP, then that's (typically) accomplished via a user-space USB driver that the application (such as digikam) makes use of. So the fact that I never saw the kernel load a module for this camera isn't a problem. (BTW, the PTP library that many apps like digikam or gphoto use is 'libgphoto2'.)
Thanks for everyone's help in the process.
- Christian
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