Re: [Libff-devel] Sidewinder FF driver

[Vojtech P. <vo...@su...>]

On Thu, Apr 11, 2002 at 11:48:07AM -0300, Rodrigo Damazio wrote:
> Fabien Brachere wrote:
> 
> >Rodrigo Damazio wrote :
> >
> >>Fabien Brachere wrote:
> >>
> >>>Ok, I didn't have an heart attack, and I put all this stuff on a very
> >>>minimal web site: http://madfab.free.fr/ff/index.html
> >>>
> >>>Fabien Brachere
> >>>
> >>        Nicely done...perhaps you'd like to help with the PID code? 
> >>Instead of registering itself for specific USB device IDs, it's a 
> >>subclass of the HID class, so whenever a HID device is detected, it 
> >>checks if it's also PID-compliant, and if it is then you can use force 
> >>feedback calls on it(this also allows us to not worry at all about 
> >>reading the axes input, since HID does that already)...the structs for 
> >>these calls are the very same that are used for I-Force, the only 
> >>difference is how we generate and send packets to the device...
> >>
> >
> >I know that the Sidewinder is registered by the HID module, but I'm not
> >satisfy with this: the joydev module report 24 buttons and 10 axes (it's
> >a big joystick but not so big ...), the only quick solution I found is
> >to short-cut hid by specifying USB device IDs, it's just for
> >development, I think we can see this later.
> >
>         That's indeed true...I wonder why that happens - is it the 
> joystick that reports itself as having all that, or is it a bug in the 
> HID code? I think it's too small of a thing to re-create the driver 
> though, it can probably be fixed...

Most likely some of the PID stuff gets assigned as buttons/axes, because
no better match can be found - there are fallbacks in the input<->hid
mapping code.

> >The first important thing is to implement correct upload effect to the
> >device memory, once uploaded it's trivial to play it.
> >
>         I know...that's what I'm working on...these last days I merged 
> parts of the code from Bjorn and added missing parts to it, so it 
> already detects all FF capabilities of the joystick...

-- 
Vojtech Pavlik
SuSE Labs