according to www.gphoto.org (which does NOT support the HP 315) you can use the
instructions from http://www.harald-schreiber.de/ as a basis to dealing with it
under linux.

Hope this helps.

> Hi everyone, I'm new to linux and I was wondering if anyone could help me to
> get my digital camera working with RH 7.2. The camera is an HP photosmart
> 315. I read somewhere about being able to mount the camera as a mass storage
> device. Any ideas? Thanks in advance.