Input: usbtouchscreen - add support for IRTOUCHSYSTEMS touchscreens

This patch adds support for IRTOUCHSYSTEMS (or UNITOP) infrared touchscreens.

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>
Signed-off-by: Daniel Ritz <daniel.ritz@gmx.ch>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

2 files changed, 39 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index e5cca9bd0406..69371779806a 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -177,6 +177,7 @@ config TOUCHSCREEN_USB_COMPOSITE
           - 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 @@ config TOUCHSCREEN_USB_DMC_TSC10
         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
diff --git a/drivers/input/touchscreen/usbtouchscreen.c b/drivers/input/touchscreen/usbtouchscreen.c
index e3f22852bd09..b407028ffc59 100644
--- a/drivers/input/touchscreen/usbtouchscreen.c
+++ b/drivers/input/touchscreen/usbtouchscreen.c
@@ -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 @@ enum {
         DEVTYPE_ETURBO,
         DEVTYPE_GUNZE,
         DEVTYPE_DMC_TSC10,
+        DEVTYPE_IRTOUCH,
 };
 
 static struct usb_device_id usbtouch_devices[] = {
@@ -150,6 +152,11 @@ static struct usb_device_id usbtouch_devices[] = {
         {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 @@ static int dmc_tsc10_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 
 
 /*****************************************************************************
+ * 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 @@ static struct usbtouch_device_info usbtouch_dev_info[] = {
                 .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
 };