diff -uNr src/2.6.22/wacom_wac.h src/2.6.22/wacom_wac.h
--- src/2.6.22/wacom_wac.h	2008-04-11 18:11:30.000000000 -0400
+++ src/2.6.22/wacom_wac.h	2008-04-18 07:21:55.000000000 -0400
@@ -27,6 +27,7 @@
 	CINTIQ,
 	WACOM_BEE,
 	WACOM_MO,
+	TABLETPC,
 	MAX_TYPE
 };
 
diff -uNr src/2.6.24/wacom_sys.c src/2.6.24/wacom_sys.c
--- src/2.6.24/wacom_sys.c	2008-04-11 18:11:30.000000000 -0400
+++ src/2.6.24/wacom_sys.c	2008-04-18 07:21:55.000000000 -0400
@@ -219,6 +219,12 @@
 	input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_RUBBER);
 }
 
+void
+input_dev_tpc (struct input_dev *input_dev, struct wacom_wac *wacom_wac)
+{
+	input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_RUBBER);
+}
+
 static int wacom_probe(struct usb_interface *intf, const struct usb_device_id *id)
 {
 	struct usb_device *dev = interface_to_usbdev(intf);
@@ -286,12 +292,17 @@
 		goto fail3;
 
 	/* Ask the tablet to report tablet data. Repeat until it succeeds */
-	do {
-		rep_data[0] = rep_data[1] = 2;
-		if(usb_set_report(intf, 3, 2, rep_data, 2) >= 0)
-			error = usb_get_report(intf, 3, 2, rep_data, 2);
-	} while ((error <= 0 || rep_data[1] != 2) && limit++ < 5);
-
+	if (wacom_wac->features->type == TABLETPC) { /* USB ISDv4 (TabletPC) doesn't support SetReport */
+		usb_get_report(intf, 3, 2, rep_data, 2);
+		if (rep_data[0] != 2 || rep_data[1] != 0)
+			info("Got bad report from TabletPC, may not work properly");
+	} else {
+		do {
+			rep_data[0] = rep_data[1] = 2;
+			if(usb_set_report(intf, 3, 2, rep_data, 2) >= 0)
+				error = usb_get_report(intf, 3, 2, rep_data, 2);
+		} while ((error <= 0 || rep_data[1] != 2) && limit++ < 5);
+	}
 	usb_set_intfdata(intf, wacom);
 	return 0;
 
diff -uNr src/2.6.19/wacom.h src/2.6.19/wacom.h
--- src/2.6.19/wacom.h	2008-04-11 18:11:30.000000000 -0400
+++ src/2.6.19/wacom.h	2008-04-18 07:21:55.000000000 -0400
@@ -125,6 +125,7 @@
 extern void input_dev_i(struct input_dev *input_dev, struct wacom_wac *wacom_wac);
 extern void input_dev_pl(struct input_dev *input_dev, struct wacom_wac *wacom_wac);
 extern void input_dev_pt(struct input_dev *input_dev, struct wacom_wac *wacom_wac);
+extern void input_dev_tpc(struct input_dev *input_dev, struct wacom_wac *wacom_wac);
 extern __u16 wacom_le16_to_cpu(unsigned char *data);
 extern __u16 wacom_be16_to_cpu(unsigned char *data);
 extern struct wacom_features * get_wacom_feature(const struct usb_device_id *id);
diff -uNr src/2.6.19/wacom_wac.c src/2.6.19/wacom_wac.c
--- src/2.6.19/wacom_wac.c	2008-04-11 18:11:30.000000000 -0400
+++ src/2.6.19/wacom_wac.c	2008-04-18 11:10:48.000000000 -0400
@@ -535,6 +535,92 @@
 	return 1;
 }
 
+int wacom_tpc_irq (struct wacom_wac *wacom_wac, void *wcombo)
+{
+	static int stylus_inrange;
+	char *data = wacom_wac->data;
+	struct wacom_combo *combo = wcombo;
+	struct urb *urb = combo->urb;
+	if (urb->actual_length == 5) { /* Finger */
+		int absx = ((data[2] << 8) & 0xff00) + (data[1] & 0xff);
+		int absy = ((data[4] << 8) & 0xff00) + (data[3] & 0xff);
+		
+		if (stylus_inrange) {
+			if (wacom_wac->tool[1]) {
+				return 0;
+			} else {
+				wacom_report_key (wcombo, BTN_TOOL_PEN, 0);
+				wacom_report_key (wcombo, BTN_TOUCH, 0);
+				wacom_report_abs (wcombo, ABS_PRESSURE, 0);
+				wacom_wac->tool[1] = 1;	
+				goto end;
+			}
+		}
+		wacom_wac->tool[1] = 0;
+
+		absx = (absx * wacom_wac->features->x_max) / 4096;
+		absy = (absy * wacom_wac->features->y_max) / 4096;
+		wacom_report_key (wcombo, ABS_MISC, STYLUS_DEVICE_ID);
+		wacom_report_key (wcombo, BTN_TOOL_PEN, data[0] & 0x1);
+		wacom_report_key (wcombo, BTN_TOUCH, data[0] & 0x1);
+		wacom_report_abs (wcombo, ABS_X, absx);
+		wacom_report_abs (wcombo, ABS_Y, absy);
+		if (data[0] & 0x1)
+			wacom_report_abs (wcombo, ABS_PRESSURE, 255);
+		else
+			wacom_report_abs (wcombo, ABS_PRESSURE, 0);
+	} else { /* Stylus */
+		int absx = ((data[3] << 8) & 0xff00) + (data[2] & 0xff);
+		int absy = ((data[5] << 8) & 0xff00) + (data[4] & 0xff);
+		int absp = ((data[7] << 8) & 0x0100) + (data[6] & 0xff);
+		int oldtool = wacom_wac->tool[0];
+		stylus_inrange = data[1] & 0x20;
+
+		if (data[1] == 0) { /* Out of range */
+			wacom_wac->tool[0] = 0;
+			wacom_report_key (wcombo, BTN_TOOL_RUBBER, 0);
+			wacom_report_key (wcombo, BTN_TOOL_PEN, 0);
+			wacom_report_key (wcombo, BTN_TOUCH, 0);
+			wacom_report_key (wcombo, BTN_STYLUS, 0);
+			wacom_report_key (wcombo, BTN_STYLUS2, 0);
+			goto end;
+		} else if (data[1] & 0x8) { /* Eraser */
+			wacom_wac->tool[0] = BTN_TOOL_RUBBER;
+
+			if (oldtool == BTN_TOOL_PEN) {
+				wacom_report_key (wcombo, BTN_TOOL_PEN, 0);
+				wacom_report_key (wcombo, BTN_TOUCH, 0);
+				wacom_report_key (wcombo, BTN_STYLUS, 0);
+				wacom_report_key (wcombo, BTN_STYLUS2, 0);
+				goto end;
+			}
+			wacom_report_key (wcombo, BTN_TOOL_RUBBER, data[1] & 0x20);
+			wacom_report_key (wcombo, BTN_TOUCH, (data[1] & 0x4));
+			wacom_report_abs (wcombo, ABS_MISC, STYLUS_DEVICE_ID);
+		} else { /* Pen */
+			wacom_wac->tool[0] = BTN_TOOL_PEN;
+
+			if (oldtool == BTN_TOOL_RUBBER) {
+				wacom_report_key (wcombo, BTN_TOOL_RUBBER, 0);
+				wacom_report_key (wcombo, BTN_TOUCH, 0);
+				goto end;
+			}
+			wacom_report_key (wcombo, BTN_TOOL_PEN, data[1] & 0x20);
+			wacom_report_key (wcombo, BTN_TOUCH, (data[1] & 0x1));
+			wacom_report_abs (wcombo, ABS_MISC, STYLUS_DEVICE_ID);
+		}
+		
+		wacom_report_key (wcombo, BTN_STYLUS, data[1] & 0x2);
+		wacom_report_key (wcombo, BTN_STYLUS2, data[1] & 0x10);
+		wacom_report_abs (wcombo, ABS_X, absx);
+		wacom_report_abs (wcombo, ABS_Y, absy);
+		wacom_report_abs (wcombo, ABS_PRESSURE, absp);
+	}
+end:
+	wacom_input_sync(wcombo);
+	return 0;
+}
+
 int wacom_wac_irq(struct wacom_wac *wacom_wac, void *wcombo)
 {
 	switch (wacom_wac->features->type) {
@@ -560,6 +646,9 @@
 		case WACOM_BEE:
 			return (wacom_intuos_irq(wacom_wac, wcombo));
 			break;
+		case TABLETPC:
+			return (wacom_tpc_irq(wacom_wac, wcombo));
+			break;
 		default:
 			return 0;
 	}
@@ -596,6 +685,9 @@
 		case PENPARTNER:
 			input_dev_pt(input_dev, wacom_wac);
 			break;
+		case TABLETPC:
+			input_dev_tpc(input_dev, wacom_wac);
+			break;
 	}
 	return;
 }
@@ -651,6 +743,8 @@
 	{ "Wacom Cintiq 20WSX",  10, 86680, 54180, 1023, 63, WACOM_BEE },
 	{ "Wacom Cintiq 12WX",   10, 53020, 33440, 1023, 63, WACOM_BEE },
 	{ "Wacom Intuos2 6x8",   10, 20320, 16240, 1023, 31, INTUOS },
+	{ "Wacom ISDv4 USB",      8, 26202, 16325,  255,  0, TABLETPC },
+	{ "Wacom ISDv4 USB",      8, 26202, 16325,  255,  0, TABLETPC },
 	{ }
 };
 
@@ -705,6 +799,8 @@
 	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0xC5) },
 	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0xC6) },
 	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x47) },
+	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x90) },
+	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x93) },
 	{ }
 };