Re: [linux-usb-devel] USB Still Image Capture device class driver & USb

On Wed, 30 Jan 2008, Alan Stern wrote:

> On Wed, 30 Jan 2008, praveen koduru wrote:
> 
> > Hai,
> >   I have a question related to your PTP device driver ( Picture
> > Transfer Protocol ).
> > 
> > Can USB Still Image Capture Class driver and USB Mass Storage class
> > driver co- exists in the gadget?
> 
> In theory they can.  However the current version of the g_file_storage
> driver is not designed to coexist with other gadget drivers.  There has
> been some progress in that direction, but you'll have to search through
> the mailing list archives to find it.

Just checking if this emanation of PTP/MTP/Still Image Capture software 
has any material backing or is as much of a phyntom as all others - whose 
"yours" driver is meant here and where can it be found?

Thanks
Guennadi

> 
> > If yes How to synchronize the calls between these two with the below
> > DCD (Devcie Controler Driver ), do we need a middle layer ( Core
> > driver like in Host side ) ?
> 
> You do need a middle layer, but not to synchronize calls.  The middle 
> layer is needed to allocate resources such as endpoints, interface 
> numbers, descriptors, and so on.
> 
> Another issue you will face is that the two drivers cannot share the 
> same storage medium unless they both are set to read-only access.
> 
> Alan Stern
> 
> 
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---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
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