On Tue, Oct 23, 2001 at 09:47:31AM +0200, O. Beaudoux wrote:
> > > I think its effectively a good choice for a standard mouse usage. But
> > > when I want to use a grapic tablet (a wacom intuos for instance), I'll
> > > need to get stylus pressure information as well as stylus unique ID. And
> > > if I want to manage a complementary keyboard (a key pad for instance), I
> > > think its the same problem.
> >
> > For this type of access, /dev/input/eventX was designed. It'll give you
> > all you describe.
> 
> I have tried it but I cannot make it work. I run it under kernel 2.2.18 and 
> 2.4.0 (SuSE 7.1 installation). If it can work, I effectively think its the 
> better choice :-)

What's your problem with it? I'll help if I can.

> > For a more low level access, /dev/hiddevX was designed. You shouldn't need
> > direct USB access.
> 
> I know about it but it seems that (by default), every few devices are 
> accessible through it...

Yes, by default only non-input HID devices are available through it.
This can be changed, though.

> > It's not nice if a simple lsusb disconnects all devices and reconnects
> > them again after exiting. It'll cause a lot of mess, because the devices
> > will be assigned different numbers and running applications will lose
> > access to them.
> 
> I understand your comments and fully agree on. The fact is I just want to 
> make some research stuff about HCI with our engineer students for this year. 
> For a futur and "nice" implementation of HID access, I find the best solution 
> is to wait for more "stable" things under new kernel versions... ?

Yes, I hope this'll all be solved in an elegant way eventually.

-- 
Vojtech Pavlik
SuSE Labs

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