Hi all,
I recently got hold of a second-hand DTI-520 and I'd like to get it working
under Linux. It seems it is not yet supported, so I am trying to add support
for it.
After adding in USB IDs to the kernel driver and the X11 module it starts
returning data when I move the stylus around. The X-coordinates seem fine (0
to 3208) but for some reason the Y coordinate seems to wrap around as I move
down the screen. I'm not sure what's causing this - here is some sample
output from 'xinput test' as I move the stylus about a third of the way down
the screen:
motion a[0]=770 a[1]=63458 a[2]=0 a[3]=0 a[4]=0 a[5]=-900
motion a[0]=770 a[1]=63874 a[2]=0 a[3]=0 a[4]=0 a[5]=-900
motion a[0]=770 a[1]=64322 a[2]=0 a[3]=0 a[4]=0 a[5]=-900
motion a[0]=770 a[1]=64770 a[2]=0 a[3]=0 a[4]=0 a[5]=-900
motion a[0]=770 a[1]=48834 a[2]=4 a[3]=0 a[4]=0 a[5]=-900
motion a[0]=770 a[1]=32898 a[2]=4 a[3]=0 a[4]=0 a[5]=-900
motion a[0]=770 a[1]=16931 a[2]=4 a[3]=0 a[4]=0 a[5]=-900
motion a[0]=769 a[1]=932 a[2]=4 a[3]=0 a[4]=0 a[5]=-900
motion a[0]=769 a[1]=1351 a[2]=4 a[3]=0 a[4]=0 a[5]=-900
motion a[0]=769 a[1]=1801 a[2]=4 a[3]=0 a[4]=0 a[5]=-900
motion a[0]=769 a[1]=2283 a[2]=4 a[3]=0 a[4]=0 a[5]=-900
motion a[0]=769 a[1]=2829 a[2]=4 a[3]=0 a[4]=0 a[5]=-900
motion a[0]=769 a[1]=3406 a[2]=4 a[3]=0 a[4]=0 a[5]=-900
Some of the code I added to the kernel module is:
static const struct wacom_features wacom_features_0x3A =
{ "Wacom DTI520UB/L", WACOM_PKGLEN_GRAPHIRE, 3250, 65600, 2047,
0, PL, WACOM_PL_RES, WACOM_PL_RES };
This gives me these messages in the Xorg output:
[ 15979.601] [dix] Unknown event type 35. No filter
[ 15979.601] [dix] Unknown event type 35. No filter
[ 15983.121] [dix] Unknown event type 35. No filter
[ 15983.121] [dix] Unknown event type 35. No filter
Two messages each time I touch and remove the stylus from the surface.
Changing the "PL" type in the above code to "PTU" returns a button press and
button release event instead, as the stylus touches and leaves the surface.
I'm guessing this means the PTU type is probably more correct than PL. I also
seem to get pressure values coming in with the PTU type as well (in xinput's
a[2] value), although they seem a bit weird (the values are all < 256 but with
spatterings of 2048 among them, except it stays at 2048 if I press the stylus
fairly hard.)
Unfortunately I'm just poking around in the dark here, so I'm not really sure
where to go next. Does anyone know how I can proceed with figuring out how to
get this device working properly?
Many thanks,
Adam.
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