Input: wacom - fix TabletPC touch bug

This patch fixed a bug that was introduced in kernel 2.6.28 for
TabletPC touch data. The wacom_parse_hid routine in wacom_sys.c
should always return 0 even when usb_control_msg got an error.
Signed-off-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/tablet/wacom.h

@@ -11,7 +11,7 @@
  *  Copyright (c) 2000 Daniel Egger		<egger@suse.de>
  *  Copyright (c) 2001 Frederic Lepied		<flepied@mandrakesoft.com>
  *  Copyright (c) 2004 Panagiotis Issaris	<panagiotis.issaris@mech.kuleuven.ac.be>
- *  Copyright (c) 2002-2008 Ping Cheng		<pingc@wacom.com>
+ *  Copyright (c) 2002-2009 Ping Cheng		<pingc@wacom.com>
  *
  *  ChangeLog:
  *      v0.1 (vp)  - Initial release
@@ -67,6 +67,7 @@
  *      v1.47 (pc) - Added support for Bamboo
  *      v1.48 (pc) - Added support for Bamboo1, BambooFun, and Cintiq 12WX
  *      v1.49 (pc) - Added support for USB Tablet PC (0x90, 0x93, and 0x9A)
+ *      v1.50 (pc) - Fixed a TabletPC touch bug in 2.6.28
  */
 
 /*
@@ -87,7 +88,7 @@
 /*
  * Version Information
  */
-#define DRIVER_VERSION "v1.49"
+#define DRIVER_VERSION "v1.50"
 #define DRIVER_AUTHOR "Vojtech Pavlik <vojtech@ucw.cz>"
 #define DRIVER_DESC "USB Wacom Graphire and Wacom Intuos tablet driver"
 #define DRIVER_LICENSE "GPL"

drivers/input/tablet/wacom_sys.c

@@ -289,6 +289,7 @@ static int wacom_parse_hid(struct usb_interface *intf, struct hid_descriptor *hi
 			5000); /* 5 secs */
 	} while (result < 0 && limit++ < 5);
 
+	/* No need to parse the Descriptor. It isn't an error though */
 	if (result < 0)
 		goto out;
 
@@ -368,9 +369,8 @@ static int wacom_parse_hid(struct usb_interface *intf, struct hid_descriptor *hi
 		}
 	}
 
-	result = 0;
-
  out:
+	result = 0;
 	kfree(report);
 	return result;
 }
@@ -425,6 +425,15 @@ static int wacom_probe(struct usb_interface *intf, const struct usb_device_id *i
 
 	endpoint = &intf->cur_altsetting->endpoint[0].desc;
 
+	/* Initialize touch_x_max and touch_y_max in case it is not defined */
+	if (wacom_wac->features->type == TABLETPC) {
+		features->touch_x_max = 1023;
+		features->touch_y_max = 1023;
+	} else {
+		features->touch_x_max = 0;
+		features->touch_y_max = 0;
+	}
+
 	/* TabletPC need to retrieve the physical and logical maximum from report descriptor */
 	if (wacom_wac->features->type == TABLETPC) {
 		if (usb_get_extra_descriptor(interface, HID_DEVICET_HID, &hid_desc)) {