linux-kernel - [PATCH] itmtouch: fix inverted flag to indicate touch location correctly

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Message-ID: <7f9863480610041736k2fe84c6bqd1d9740868dedf7d@mail.gmail.com>
Date:	Thu, 5 Oct 2006 10:36:49 +1000
From:	"Mark Assad" <massad@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	trivial@...nel.org, hc@...u.no, torvalds@...l.org, dtor@...l.ru
Subject: [PATCH] itmtouch: fix inverted flag to indicate touch location correctly

From: Mark Assad <massad@...il.com>

There is a bug in the current version of the itmtouch USB touchscreen
driver. The if statment that checks if pressure is being applied to
the touch screen is now missing a ! (not), so events are no longer
being reported correctly.

The origonal source code for this line was as follows:
#define UCP(x) ((unsigned char*)(x))
#define UCOM(x,y,z) ((UCP((x)->transfer_buffer)[y]) & (z))
if (!UCOM(urb, 7, 0x20)) {

And was cleaned to:
 unsigned char *data = urb->transfer_buffer;
....
 if (data[7] & 0x20) {

(note the lack of ! )

This has been tested on an LG L1510BF and an LG1510SF touch screen.

Patched applied from: linux-2.6.18

Signed-off-by: Mark Assad <massad@...il.com>

---

--- linux-2.6.18/drivers/usb/input/itmtouch.c   2006-09-20
13:42:06.000000000 +1000
+++ linux/drivers/usb/input/itmtouch.c  2006-10-05 09:49:56.000000000 +1000
@@ -36,7 +36,11 @@
  *
  * 1.2.1  09/03/2005 (HCE) hc@...u.no
  *   Code cleanup and adjusting syntax to start matching kernel standards
- *
+ *
+ * 1.2.2  10/05/2006 (MJA) massad@...il.com
+ *   Flag for detecting if the screen was being touch was incorrectly
+ *   inverted, so no touch events were being detected.
+ *
  *****************************************************************************/

 #include <linux/kernel.h>
@@ -53,7 +57,7 @@
 #define USB_PRODUCT_ID_TOUCHPANEL      0xf9e9

 #define DRIVER_AUTHOR "Hans-Christian Egtvedt <hc@...u.no>"
-#define DRIVER_VERSION "v1.2.1"
+#define DRIVER_VERSION "v1.2.2"
 #define DRIVER_DESC "USB ITM Inc Touch Panel Driver"
 #define DRIVER_LICENSE "GPL"

@@ -108,7 +112,7 @@ static void itmtouch_irq(struct urb *urb
        input_regs(dev, regs);

        /* if pressure has been released, then don't report X/Y */
-       if (data[7] & 0x20) {
+       if (!(data[7] & 0x20)) {
                input_report_abs(dev, ABS_X, (data[0] & 0x1F) << 7 |
(data[3] & 0x7F));
                input_report_abs(dev, ABS_Y, (data[1] & 0x1F) << 7 |
(data[4] & 0x7F));
        }
-
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