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Subject[PATCH] IRTOUCHSYSTEMS support for usbtouchscreen
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Hello,
this patch adds support for IRTOUCHSYSTEMS (or UNITOP) infrared touchscreens.

The manufacturer (http://www.irtouch.com) provides only closed source drivers
for specific kernel versions (looks like GPL violation, btw.) which I haven't
even tried (as there's no chance that any of the modules could work with
2.6.22-rc kernel). They also don't provide any protocol specification.

So I made this code (attached) after observing the data stream with usbmon for
a while. If someone is interested in my observations, here are the results:

The touchscreen sends data in 8-byte packets.
BYTE 0 - unknown meaning, seen only one value: 0x54
BYTE 1 - unknown meaning, 3 lowest bits indicate touch state
values seen: 0x81, 0x82 or 0x83
bit 0 = set if the screen is touched and was not touched before (touch
bit 1 = set if the screen is touched and was touched (dragging)
bit 2 = set if the touch was ended (release)
BYTES 2 and 3 - X position, high-order-byte first, range = 0 to 0x0FFF
BYTES 4 and 5 - Y position, high-order-byte first, range = 0 to 0x0FFF
BYTE 6 - unknown meaning, seen only one value: 0xFF
BYTE 7 - unknown meaning, seen only one value: 0x00

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>

--
Ondrej Zary
diff -ur linux-2.6.22-rc6-orig/drivers/input/touchscreen/Kconfig linux-2.6.22-rc6/drivers/input/touchscreen/Kconfig
--- linux-2.6.22-rc6-orig/drivers/input/touchscreen/Kconfig 2007-06-29 12:56:19.000000000 +0200
+++ linux-2.6.22-rc6/drivers/input/touchscreen/Kconfig 2007-06-29 13:01:38.000000000 +0200
@@ -177,6 +177,7 @@
- some other eTurboTouch
- Gunze AHL61
- DMC TSC-10/25
+ - IRTOUCHSYSTEMS/UNITOP

Have a look at <http://linux.chapter7.ch/touchkit/> for
a usage description and the required user-space stuff.
@@ -219,4 +220,9 @@
bool "DMC TSC-10/25 device support" if EMBEDDED
depends on TOUCHSCREEN_USB_COMPOSITE

+config TOUCHSCREEN_USB_IRTOUCH
+ default y
+ bool "IRTOUCHSYSTEMS/UNITOP device support" if EMBEDDED
+ depends on TOUCHSCREEN_USB_COMPOSITE
+
endif
Only in linux-2.6.22-rc6/drivers/input/touchscreen/: built-in.o
diff -ur linux-2.6.22-rc6-orig/drivers/input/touchscreen/usbtouchscreen.c linux-2.6.22-rc6/drivers/input/touchscreen/usbtouchscreen.c
--- linux-2.6.22-rc6-orig/drivers/input/touchscreen/usbtouchscreen.c 2007-06-29 12:56:19.000000000 +0200
+++ linux-2.6.22-rc6/drivers/input/touchscreen/usbtouchscreen.c 2007-06-29 13:01:48.000000000 +0200
@@ -9,6 +9,7 @@
* - eTurboTouch
* - Gunze AHL61
* - DMC TSC-10/25
+ * - IRTOUCHSYSTEMS/UNITOP
*
* Copyright (C) 2004-2006 by Daniel Ritz <daniel.ritz@gmx.ch>
* Copyright (C) by Todd E. Johnson (mtouchusb.c)
@@ -110,6 +111,7 @@
DEVTYPE_ETURBO,
DEVTYPE_GUNZE,
DEVTYPE_DMC_TSC10,
+ DEVTYPE_IRTOUCH,
};

static struct usb_device_id usbtouch_devices[] = {
@@ -150,6 +152,11 @@
{USB_DEVICE(0x0afa, 0x03e8), .driver_info = DEVTYPE_DMC_TSC10},
#endif

+#ifdef CONFIG_TOUCHSCREEN_USB_IRTOUCH
+ {USB_DEVICE(0x595a, 0x0001), .driver_info = DEVTYPE_IRTOUCH},
+ {USB_DEVICE(0x6615, 0x0001), .driver_info = DEVTYPE_IRTOUCH},
+#endif
+
{}
};

@@ -416,6 +423,21 @@


/*****************************************************************************
+ * IRTOUCH Part
+ */
+#ifdef CONFIG_TOUCHSCREEN_USB_IRTOUCH
+static int irtouch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
+{
+ dev->x = (pkt[3] << 8) | pkt[2];
+ dev->y = (pkt[5] << 8) | pkt[4];
+ dev->touch = (pkt[1] & 0x03) ? 1 : 0;
+
+ return 1;
+}
+#endif
+
+
+/*****************************************************************************
* the different device descriptors
*/
static struct usbtouch_device_info usbtouch_dev_info[] = {
@@ -504,6 +526,17 @@
.read_data = dmc_tsc10_read_data,
},
#endif
+
+#ifdef CONFIG_TOUCHSCREEN_USB_IRTOUCH
+ [DEVTYPE_IRTOUCH] = {
+ .min_xc = 0x0,
+ .max_xc = 0x0fff,
+ .min_yc = 0x0,
+ .max_yc = 0x0fff,
+ .rept_size = 8,
+ .read_data = irtouch_read_data,
+ },
+#endif
};

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