Re: [Libusb-devel] Receiving interrupt transfer packets

[Nikolai K. <sp...@gm...>]

On 07/20/2010 06:59 PM, Alan Stern wrote:
> Maybe, although if you can narrow the trace down to the device or
> interface in question then all the non-HID stuff would be eliminated.
Yes. It seems I didn't give enough thought to this idea. Maybe it's because
I arrived to the need for such tool from a different direction. I think I
could use it if my attempts at the tool fail or it proves insufficient.

> Exactly what you want to do isn't clear.
Sorry, my fault.

I want to simply dump whatever a device transmits via its HID interface
interrupt IN endpoints when it is operated in different ways (all of them,
preferably).

My idea (possibly naive and insufficiently verified) is that a lot of input
devices not working with Linux could be made to work by fixing their report
descriptors. Not really fixing, but just feeding the generic HID driver with
a fixed one.

For that I need to get the report descriptors and reports themselves.
I can't own or rent all such devices, so I plan to ask their owners to
collect diagnostics for me, plus maybe get some shop assistants to give me 5
minutes with them to collect it myself.

The diagnostics tool set is just a console "wizard" asking the user to do
some input and recording whatever was produced when it was done. I have most
of it implemented for graphic tablets, but it dumps evdev events instead
currently.

> Would you be satisfied simply to have an option in libusb for printing out
> a record of all the data getting sent or received?
Thank you :) Well, it would do if nothing else works, of course. But I think
the tool would be better.

Thanks for interrogating me, I understand I wasn't clear enough :)

Sincerely,
Nick