Attached is a patch that makes linuxwacom-0.7.7-6 work with MultiTouch
input.
The main problem with supporting MultiTouch on the new X60 Tablets is
that the MultiTouch input is only 5 bytes long, as opposed to the 9
bytes of most ISDV4 messages.
To make this work, I had to hack up wcmISDV4.c to allow 5 or 9 byte
messages, depending on the message header (first byte), and of course
add support for the new messages.
Furthermore, it doesn't calibrate the new input automatically - I
calibrated it manually /in code/. This works for me, and will even
probably work on other X60 Tablets, but won't work in the future.
A few issues:
* The driver is desperate to drag instead of just click. I don't know
how to change that sensitivity.
* I believe this could cause problem with more "pure" ISDV4 tablets,
but can't test that.
Please don't import this patch yet - it's just a proof of concept :)
- Gregor Richards
diff -ru linuxwacom-0.7.7-6/src/xdrv/wcmISDV4.c linuxwacom-0.7.7-6-multitouch/src/xdrv/wcmISDV4.c
--- linuxwacom-0.7.7-6/src/xdrv/wcmISDV4.c 2007-02-20 17:21:02.000000000 -0800
+++ linuxwacom-0.7.7-6-multitouch/src/xdrv/wcmISDV4.c 2007-03-24 01:01:48.000000000 -0700
@@ -107,7 +107,9 @@
/* set parameters */
common->wcmProtocolLevel = 4;
- common->wcmPktLength = 9; /* length of a packet */
+ common->wcmPktLength = 5; /* length of a packet */
+ /* most packets are 9 bytes long,
+ * some are only 5 */
common->wcmResolX = 2540; /* tablet X resolution in points/inch */
common->wcmResolY = 2540; /* tablet Y resolution in points/inch */
common->wcmTPCButton = 1; /* Tablet PC buttons on by default */
@@ -209,9 +211,27 @@
{
WacomDeviceState* last = &common->wcmChannel[0].valid.state;
WacomDeviceState* ds;
- int n, cur_type;
+ int n, cur_type, ismt;
+ ismt = 0;
- if ((n = xf86WcmSerialValidate(common,data)) > 0)
+ /* determine the type of message */
+ if (data[0] & 0x10)
+ {
+ ismt = 1;
+ }
+ else
+ {
+ common->wcmPktLength = 9;
+ if (common->buffer + common->bufpos - data < 9)
+ {
+ /* we can't handle this yet */
+ return 0;
+ }
+ }
+
+ n = xf86WcmSerialValidate(common,data);
+ common->wcmPktLength = 5;
+ if (n > 0)
{
return n;
}
@@ -225,6 +245,21 @@
ds = &common->wcmChannel[0].work;
RESET_RELATIVE(*ds);
+ if (ismt)
+ {
+ /* MultiTouch input is comparably simple */
+ ds->proximity = (data[0] & 0x20);
+ ds->x = (((((int)data[1]) << 7) | ((int)data[2])) - 18) * common->wcmMaxX / 926;
+ ds->y = (((((int)data[3]) << 7) | ((int)data[4])) - 51) * common->wcmMaxY / 934;
+ ds->pressure = (data[0] & 0x01) * common->wcmMaxZ;
+ ds->buttons = 1;
+ ds->device_id = STYLUS_DEVICE_ID;
+ DBG(8, ErrorF("isdv4Parse MultiTouch %x p=%d\n", data[0], ds->pressure));
+ xf86WcmEvent(common,0,ds);
+ return 5;
+ }
+
+
ds->proximity = (data[0] & 0x20);
/* x and y in "normal" orientetion (wide length is X) */
-------------------------------------------------------------------------
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