A host driver "USB PTP Storage" would be really nice too. First as a generic camera interface, second to access a gadget with the PTP interface.
There isn't one. There are two. No need to be embarrassed ... ;)
They're both user-mode drivers. "gPhoto2", and "jPhoto". The author of jPhoto (moi) hasn't had time to update that code in ages.
These are applications, not file system interfaces like USB Mass Storage. I want to mount the camera or gadget file system and access it from any program, not run a separate app to fetch files like Mass Stor. mounts a memory device.
As Andrew Zabolotny commented, NFS _does_ work today from those devices. Except that it doesn't work to MS-Windows hosts, unless they've been taught other parts of the protocol stack.
Presumably Samba over RNDIS would work from Windows, but that would need extra work from many Linux hosts. Tradeoffs...
Why create a dedicated app like a camera interface instead of using your favorite image browser on some files?
Well, PTP should take less memory inside the device/gadget than a network stack, though it'd be less flexible. And there's also something to be said for less code in the kernel, and a simpler device setup model ... especially for the kinds of products that'd be considering something like PTP.
But I think the basic answer to your question is probably just that nobody's yet written, or at least submitted, PTP client or server kernel code for Linux.
- Dave
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