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https://github.com/X11Libre/xf86-input-evdev.git
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f352598e45
The relevant comment from evdev.c:
We don't allow relative and absolute axes on the same device. The
reason is that some devices (MS Optical Desktop 2000) register both
rel and abs axes for x/y.
The abs axes register min/max; this min/max then also applies to the
relative device (the mouse) and caps it at 0..255 for both axes.
So, unless you have a small screen, you won't be enjoying it much;
consequently, absolute axes are generally ignored.
However, currenly only a device with absolute axes can be registered
as a touch{pad,screen}. Thus, given such a device, absolute axes are
used and relative axes are ignored.
The code for initializing abs/rel axes has been abstracted out into
3 functions, so that initialization in EvdevInit(device) is as easy
as:
if (pEvdev->flags & (EVDEV_TOUCHPAD | EVDEV_TOUCHSCREEN))
EvdevInitTouchDevice(device, pEvdev);
else if (pEvdev->flags & EVDEV_RELATIVE_EVENTS)
EvdevInitRelClass(device, pEvdev);
else if (pEvdev->flags & EVDEV_ABSOLUTE_EVENTS)
EvdevInitAbsClass(device, pEvdev);
Signed-off-by: Michael Witten <mfwitten@gmail.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
xf86-input-evdev - Generic Linux input driver for the Xorg X server
Please submit bugs & patches to the Xorg bugzilla:
https://bugs.freedesktop.org/enter_bug.cgi?product=xorg
All questions regarding this software should be directed at the
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The master development code repository can be found at:
git://anongit.freedesktop.org/git/xorg/driver/xf86-input-evdev
http://cgit.freedesktop.org/xorg/driver/xf86-input-evdev
For more information on the git code manager, see:
http://wiki.x.org/wiki/GitPage