> Can you please send the patch to the mailing list attached as a
> text/plain attachment or inlined.  Then we can review and possibly
> commit it.

Sorry, not used to this ml.
Here it is.
Btw, you top-posted ;)

François.

> François Revol wrote:
> > Hi there.
> > We use QEMU a lot to debug Haiku, http://haiku-os.org/
> > I also wrote a little php script that use it to demo images online,
> > serving a VNC java applet to connect to it with VNC.
> > http://dev.haiku-os.org/browser/haiku/trunk/3rdparty/mmu_man/onlinedemo/haiku.php
> > > > It's a bit like what live.OSZoo does, but simpler.
> >
> > To accomodate the VNC setup, I tried to use the usb tablet
> > emulation.
> > It turns out Haiku has a driver for Wacom tablets:
> >
> > http://dev.haiku-os.org/browser/haiku/trunk/src/add-ons/kernel/drivers/input/wacom
> > > > http://dev.haiku-os.org/browser/haiku/trunk/src/add-ons/input_server/devices/wacom
> > > >
> > However, it didn't really work very well with qemu's usb-wacom
> > code.
> >
> > First, mouse stayed in the top-left corner... Seems coords were set
> > to
> > 0,0 when no button is pressed, which is wrong, most tablets
> > actually
> > sense the stylus even when it's not yet touching the surface.
> >
> > Also, coords were wrong.
> > Our driver takes the pos from the hardware, and scales them from
> > model-
> > dependant hardcoded max values:
> > http://dev.haiku-os.org/browser/haiku/trunk/src/add-ons/input_server/devices/wacom/TabletDevice.cpp#L115
> > > > down to [0.0f, 1.0f], which represents the whole screen.
> > Since QEMU reports absolute mouse position scaled from screen size
> > to
> > INT16_MAX this didn't really work.
> > Now, I'm not sure those max values are correct for all Penpartner
> > devices, or if they were calibrated on a specific item.
> > Best would be to actually read them from the HID descriptor, but
> > QEMU
> > doesn't provide one, and I read some penpartner tablets actually
> > have
> > wrong descriptors anyway.
> >
> > Finaly, I fixed button handling according to our driver, not sure
> > all
> > drivers handle them the same. pressure indicates left button, and a
> > flag tells about right one. I mapped middle button to the eraser to
> > at
> > least be useful in tablet-aware software though I'm not sure it's
> > the
> > best way.
> >
> > And... oh well seems we don't need to tell we have a contact, the
> > driver assumes it always for penpartner so it seems correct.
> >
> > I left debug macro I used just in case.
> >
> > http://revolf.free.fr/beos/patches/qemu-usb-wacom-for-haiku.diff.txt
> > > >
> > Now at least it works perfectly with our driver, appart from high
> > cpu
> > usage but that's surely be fixed by polling less often.
> >
> > Comments ?