Message-ID: <40644FCA.8000206@pacbell.net>
Date: Fri, 26 Mar 2004 07:44:10 -0800
From: David Brownell <david-b@pacbell.net>
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To: David Woodhouse <dwmw2@infradead.org>
CC: Robert Schwebel <robert@schwebel.de>,
       linux-usb-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org
Subject: Re: [ANNOUNCE] RNDIS Gadget Driver
References: <20040325221145.GJ10711@pengutronix.de>	 <40636295.7000008@pacbell.net> <1080297466.29835.144.camel@hades.cambridge.redhat.com>
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David Woodhouse wrote:
> 
> Out of interest -- have they (or has anyone else) invented a 'file
> system' USB device yet? For exporting some file systems, pretending to
> be a block device really isn't very useful.

There's a file system protocol used by many digital still cameras,
which isn't actually camera-specific.  Not MSFT-specific either.

Originally called "Picture Transfer Protocol" (PTP) it's actually
more of a remote hierarchical filesystem protocol ... with an event
channel (handy for "new picture" or "inserted new flash memory")
and some built-in search capabilities ("what JPGs do you have").
The strangest capability was a file type tag, which isn't actually
that bizarre.

As with RNDIS, and USB Mass Storage, I understand that support for
PTP is part of MS-Windows since about Win2K.  So a PTP gadget
driver would probably be a useful contribution to Linux.

- Dave


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