Re: [PATCH] Fix autocentering command in hid-lgff driver

quoted

2. http://wiibrew.org/wiki/Logitech_USB_steering_wheel

Sure, but please don't take it like I have some inside knowledge of
Logitech FF implementation. I've been given few bits of useful
information, the rest I figured out from sniffed USB communication.

Of course, we're all in the same boat of trying to figure it out. Our only
help is that Engineers are lazy and often reuse stuff they've done before.

It looks like the stiffness coeff actually
wraps around, because 0 = no stiffness, 7 = max stiffness, 8 = low
stiffness, 15 = max
stiffness. It'd be interesting to see if you can observe the same behavior
on the Wii wheel.

Yes the Wii Wheel only does 0-7 and then loops too...

I actually meant to quantify the force produced and purchased a torque
meter, but its range wasn't low enough to be useful so I took it back. I
think I can do something with a 'luggage scale' pulling at a tangent to
the wheel so will give that a try.

My reverse engineer technique had a python-hid script so that I could
throw packets directly at the wheel to produce specific force setups. I
need to port this to python-libusb (as python-hid is dead), but that
should be relatively simple and can forward off list to anyone who wants a
copy.

As for the other FF effects, I guess these are things like "rumble" etc.
I'm planning to look into it more when I'll have some extra free time.

If you figure codes out, I'd love to try them against my Wheel. I did have
a PS3 Driving Force Wireless, but fried it's micro whilst I was hooking
the BusPirate up to it.

This would work under Windows and playback various effects in test mode as
you pushed buttons - if anybody can grab some USB logs of this I can
attempt to parse them for the codes....

Simon