[PATCH] usbtouchscreen: option to swap X and Y axes

["Matteo Croce" <technoboy85@gmail.com>]

Here there is a patch to invert the X and Y axes, as my controller swaps it:

Signed-off-by: Matteo Croce <matteo@openwrt.org>

--- a/drivers/input/touchscreen/usbtouchscreen.c	2008-09-18
18:50:44.294868149 +0200
+++ b/drivers/input/touchscreen/usbtouchscreen.c	2008-09-18
18:50:44.226867816 +0200
@@ -56,8 +56,16 @@
 #define DRIVER_DESC		"USB Touchscreen Driver"

 static int swap_xy;
+static int invert_x;
+static int invert_y;
+
 module_param(swap_xy, bool, 0644);
+module_param(invert_x, bool, 0644);
+module_param(invert_y, bool, 0644);
+
 MODULE_PARM_DESC(swap_xy, "If set X and Y axes are swapped.");
+MODULE_PARM_DESC(invert_x, "If set X axe is inverted.");
+MODULE_PARM_DESC(invert_y, "If set Y axe is inverted.");

 /* device specifc data/functions */
 struct usbtouch_usb;
@@ -683,6 +691,7 @@
                                  unsigned char *pkt, int len)
 {
 	struct usbtouch_device_info *type = usbtouch->type;
+	int x, y;

 	if (!type->read_data(usbtouch, pkt))
 			return;
@@ -690,12 +699,22 @@
 	input_report_key(usbtouch->input, BTN_TOUCH, usbtouch->touch);

 	if (swap_xy) {
-		input_report_abs(usbtouch->input, ABS_X, usbtouch->y);
-		input_report_abs(usbtouch->input, ABS_Y, usbtouch->x);
+		x = usbtouch->y;
+		y = usbtouch->x;
+		if(invert_x)
+			x = type->max_yc - (x - type->min_yc);
+		if(invert_y)
+			y = type->max_xc - (y - type->min_xc);
 	} else {
-		input_report_abs(usbtouch->input, ABS_X, usbtouch->x);
-		input_report_abs(usbtouch->input, ABS_Y, usbtouch->y);
+		x = usbtouch->x;
+		y = usbtouch->y;
+		if(invert_x)
+			x = type->max_xc - (x - type->min_xc);
+		if(invert_y)
+			y = type->max_yc - (y - type->min_yc);
 	}
+	input_report_abs(usbtouch->input, ABS_X, x);
+	input_report_abs(usbtouch->input, ABS_Y, y);
 	if (type->max_press)
 		input_report_abs(usbtouch->input, ABS_PRESSURE, usbtouch->press);
 	input_sync(usbtouch->input);