input: Add support for eGalax TouchKit USB touchscreen used on HP tx1305us

The eGalax touchscreen used in the HP tx1305us tablet PC (and presumably the rest of the tx1000 series) uses a different format for events from the device than the existing driver supports.

Add a new device description and interrupt packet handler for the touchscreen used in the tx1305us, claiming the USB device ID for the device that this patch was tested with from the older eGalax device code.

---

Applies clean with linux-2.6.25 and linux-2.6.26-rc6.

@@ -103,6 +103,7 @@ struct usbtouch_usb {

enum {
    DEVTPYE_DUMMY = -1,
    DEVTYPE_EGALAX,
+    DEVTYPE_EGALAX2,
    DEVTYPE_PANJIT,
    DEVTYPE_3M,
    DEVTYPE_ITM,
@@ -120,7 +121,7 @@ static struct usb_device_id usbtouch_dev
    {USB_DEVICE(0x3823, 0x0001), .driver_info = DEVTYPE_EGALAX},
    {USB_DEVICE(0x3823, 0x0002), .driver_info = DEVTYPE_EGALAX},
    {USB_DEVICE(0x0123, 0x0001), .driver_info = DEVTYPE_EGALAX},
-    {USB_DEVICE(0x0eef, 0x0001), .driver_info = DEVTYPE_EGALAX},
+    {USB_DEVICE(0x0eef, 0x0001), .driver_info = DEVTYPE_EGALAX2},
    {USB_DEVICE(0x0eef, 0x0002), .driver_info = DEVTYPE_EGALAX},
    {USB_DEVICE(0x1234, 0x0001), .driver_info = DEVTYPE_EGALAX},
    {USB_DEVICE(0x1234, 0x0002), .driver_info = DEVTYPE_EGALAX},

@@ -217,6 +218,15 @@ static int egalax_get_pkt_len(unsigned c

    return 0;
}
+
+static int egalax2_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
+{
+    dev->x = ((pkt[3] & 0x0F) << 8) | pkt[2];
+    dev->y = ((pkt[5] & 0x0F) << 8) | pkt[4];
+    dev->touch = pkt[1] & 0x01;

+
+ return 1;
+}
#endif

@@ -555,6 +565,15 @@ static struct usbtouch_device_info usbto
.get_pkt_len = egalax_get_pkt_len,
.read_data = egalax_read_data,
},
+
+ [DEVTYPE_EGALAX2] = {

+        .min_xc        = 0x0,
+        .max_xc        = 0x0fff,
+        .min_yc        = 0x0,
+        .max_yc        = 0x0fff,
+        .rept_size    = 8,
+        .read_data    = egalax2_read_data,

+ },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_PANJIT