On Thu, Mar 15, 2012 at 11:29:37AM -0700, Chase Douglas wrote:
> On 03/15/2012 10:56 AM, Thorsten Wissmann wrote:
> > On Thu, Mar 15, 2012 at 12:27:22PM -0500, Chris Bagwell wrote:
> >> If you want to work with other unmodified user land apps (perhaps
> >> xf86-input-evdev for touches) then its probably easiest to split pen
> >> and touch to separate input devices. drivers/input/tablet/wacom_wac.c
> >> shows some examples of that approach but that driver doesn't have to
> >> work to hard to split in to 2 input devices because the USB device
> >> already puts the events on separate USB interfaces.
> >
> > OK. We want the device to work with the xf86-input-evdev driver. So we
> > will split it into two devices.
>
> Or you could teach evdev to know how to handle mixed devices :). I think
> that's the "better" approach over all, but it's up to you.
Thanks! We didn't thought about this. It turned out that the problem
isn't caused by the usage of both BTN_TOOL_PEN and BTN_TOOL_FINGER.
It turned out xf86-input-evdev really discards all non-multitouch events
(especially ABS_X and ABS_Y) events in EvdevProcessAbsoluteMotionEvent()
in evdev.c, if the device is configured as a multitouch device. So there
is a quick fix (or only workaround?), which processes ABS_X and ABS_Y
events even if it is a multitouch device:
diff --git a/src/evdev.c b/src/evdev.c
index d540b87..b857b83 100644
--- a/src/evdev.c
+++ b/src/evdev.c
@@ -832,7 +832,7 @@ EvdevProcessAbsoluteMotionEvent(InputInfoPtr pInfo,
struct input_event *ev)
if (ev->code >= ABS_MT_SLOT) {
EvdevProcessTouchEvent(pInfo, ev);
pEvdev->abs_queued = 1;
- } else if (!pEvdev->mt_mask) {
+ } else if (!pEvdev->mt_mask || ev->code == ABS_X || ev->code ==
ABS_Y) {
map = pEvdev->axis_map[ev->code];
valuator_mask_set(pEvdev->vals, map, value);
pEvdev->abs_queued = 1;
This patch already is submitted to the xorg bugtracker and can be found
at [1].
The only remaining question is: Does it break other drivers?
Max and Thorsten
[1] https://bugs.freedesktop.org/show_bug.cgi?id=47382
--
1.7.9.3
--
To unsubscribe from this list: send the line "unsubscribe linux-input" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
