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List:       openbsd-ports
Subject:    Re: OpenBSD (X41) Tablet Support (linuxwacom)
From:       Stanley Lieber <stanley.lieber () gmail ! com>
Date:       2010-05-31 7:05:51
Message-ID: AANLkTil5JlISDMSLlV3xhCksGcdZlmlK1WJZ0N4PSYQL () mail ! gmail ! com
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Michael-392 wrote:
> 
> Hi,
> 
> I am trying to get the tablet screen working on the X41. After googling
> I found that it once worked with OpenBSD 4.4 and linuxwacom-0.8.2:
> 
> http://webcache.googleusercontent.com/search?q=cache:2ywAxrd95GIJ:https://osuny.co.uk/~azure/txt/openbsd_thinkpad_x41_tablet.txt
>  
> However, a lot has changed since then. 0.8.2 doesn't work anymore with
> the -current OpenBSD X11 version and I also don't get any newer version
> of linxuwacom to compile for other reasons (seems to have something todo
> with LINUX_INPUT).
> 
> Anyone got more luck and/or porting experience? ;-)
> 
> Michael


I helped test the original howto you linked above. Pen functions fully
worked under 4.4-RELEASE.

I played around with this a bit tonight (running the 05/29/10 snapshot of
4.7-CURRENT) and after some patching I got linuxwacom-0.8.2 to compile and
install (see patch below).

The next problem was calibrating the pen. After I setup xorg.conf
and restarted, things were way out of whack. Moving the pen to the
upper-left corner brought the cursor almost in line with the pen point.
Moving the pen away from the upper-left corner of the screen resulted in an
increasing distance between the cursor and the pen point.

I wasn't sure where to proceed from there. It is possible my patch messes
up something important for pen calibration. The
InitValuatorClassDeviceStruct function  was being called with too many
arguments (I removed only what I believed to be bounds checking, but
that seemed to satisfy the compiler). Removing OutOfProximity is a
change from versions of linuxwacom that came after 0.8.2 and shouldn't
hurt anything (especially since we specify Absolute in xorg.conf
anyway).

None of the calibration tools I've found so far seem to work with OpenBSD.
The bundled utility wacomcpl will launch, but doesn't recognize any devices.
I found another perl script someone wrote to make calibration easier, but it
requires Glib2 and GTK+ perl modules, which are marked as broken in ports.

I'll post here if I make any more progress.

-sl



--- begin patch ---

--- src/xdrv/xf86Wacom.c.old    Sun May 30 22:46:45 2010
+++ src/xdrv/xf86Wacom.c        Sun May 30 22:48:57 2010
@@ -582,14 +582,11 @@
       if (InitValuatorClassDeviceStruct(local->dev, nbaxes,
 #if WCM_XINPUTABI_MAJOR == 0
                                         xf86GetMotionEvents,
-                                         local->history_size,
 #else
                                         GetMotionHistory,
-                                         GetMotionHistorySize(),
 #endif
                                         ((priv->flags & ABSOLUTE_FLAG) ?
-                                         Absolute : Relative) |
-                                         OutOfProximity ) == FALSE)
+                                         Absolute : Relative)) == FALSE)
       {
               ErrorF("unable to allocate Valuator class device\n");
               return FALSE;
@@ -925,18 +922,6 @@
               }
               pos += cnt;

-               if (common->wcmDevCls != &gWacomUSBDevice)
-               {
-                       common->wcmPktLength = 9;
-                       data = common->buffer + pos;
-                       if ( data[0] & 0x18 )
-                       {
-                               if (common->wcmMaxCapacity)
-                                       common->wcmPktLength = 7;
-                               else
-                                       common->wcmPktLength = 5;
-                       }
-               }
       }

       if (pos)

--- end patch ---


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