On Wed, 28 Apr 2010, [utf-8] Michał Nazarewicz wrote:

quoted text
> So it will be enough to change the USB device class for the zeroth
> interface for udev to recognise the mass storage to be ejected?  Note
> that I will use mass storage in the second mode as well.

No, you also have to go through a disconnect-reconnect cycle on the USB 
bus.  When you do, changing the bInterfaceClass value will be 
sufficient to tell the kernel that the device needs to be 
re-enumerated.

quoted text
> Also, I think that it might be a good idea to make some "standardised"
> mechanism for all such devices so that a generic udev code could be
> written.  Adding things to the descriptors may be difficult in a way,
> but maybe adding "[NoCD]" to the interface name would be enough.

I seriously doubt you'll be able to convince all the other
manufacturers to agree to a standardized convention for this.

Alan Stern

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