From 16da0dabcace21df64e38e88e71c4ca96854372d Mon Sep 17 00:00:00 2001
From: codewalker <codewalker@hardkernel.com>
Date: Fri, 7 Apr 2017 14:27:53 +0900
Subject: [PATCH] ODROID: Enable invert touch screen.

Change-Id: I5d3c0ae8f1a4c3d864064f431f4b6f854980bfa3
---
 drivers/hid/hid-multitouch.c            | 16 +++++++-
 drivers/input/touchscreen/dwav-usb-mt.c | 50 ++++++++++++++++++++++++-
 2 files changed, 62 insertions(+), 4 deletions(-)

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 14a9a89cc2ee..df4f421f2886 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -607,6 +607,8 @@ static int mt_compute_slot(struct mt_device *td, struct input_dev *input)
 	return input_mt_get_slot_by_key(input, td->curdata.contactid);
 }
 
+extern bool touch_invert_x;
+extern bool touch_invert_y;
 /*
  * this function is called when a whole contact has been processed,
  * so that it can assign it to a slot and store the data there
@@ -647,8 +649,18 @@ static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
 			int major = max(s->w, s->h) >> 1;
 			int minor = min(s->w, s->h) >> 1;
 
-			input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
-			input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
+			if (touch_invert_x)
+				input_event(input, EV_ABS, ABS_MT_POSITION_X,
+					input->absinfo[0].maximum - s->x);
+			else
+				input_event(input, EV_ABS, ABS_MT_POSITION_X,
+						s->x);
+			if (touch_invert_y)
+				input_event(input, EV_ABS, ABS_MT_POSITION_Y,
+					input->absinfo[1].maximum - s->y);
+			else
+				input_event(input, EV_ABS, ABS_MT_POSITION_Y,
+						s->y);
 			input_event(input, EV_ABS, ABS_MT_TOOL_X, s->cx);
 			input_event(input, EV_ABS, ABS_MT_TOOL_Y, s->cy);
 			input_event(input, EV_ABS, ABS_MT_DISTANCE,
diff --git a/drivers/input/touchscreen/dwav-usb-mt.c b/drivers/input/touchscreen/dwav-usb-mt.c
index fc2c0ba28ecb..89d903020dff 100644
--- a/drivers/input/touchscreen/dwav-usb-mt.c
+++ b/drivers/input/touchscreen/dwav-usb-mt.c
@@ -123,6 +123,42 @@ struct dwav_usb_mt  {
 	struct finger_t		*finger;
 };
 
+bool touch_invert_x;
+/*-------------------------------------------------------------------------*/
+static int __init touch_invert_x_para_setup(char *s)
+{
+	touch_invert_x = false;
+	if (!strncmp(s, "true", 4))
+		touch_invert_x = true;
+	else if (!strncmp(s, "false", 5))
+		touch_invert_x = false;
+	else {
+		pr_err("%s - wrong touch_invert_x parameter", __func__);
+		touch_invert_x = true;
+	}
+
+	return 0;
+}
+__setup("touch_invert_x=", touch_invert_x_para_setup);
+
+bool touch_invert_y;
+/*-------------------------------------------------------------------------*/
+static int __init touch_invert_y_para_setup(char *s)
+{
+	touch_invert_y = false;
+	if (!strncmp(s, "true", 4))
+		touch_invert_y = true;
+	else if (!strncmp(s, "false", 5))
+		touch_invert_y = false;
+	else {
+		pr_err("%s - wrong touch_invert_y parameter", __func__);
+		touch_invert_y = true;
+	}
+
+	return 0;
+}
+__setup("touch_invert_y=", touch_invert_y_para_setup);
+
 /*-------------------------------------------------------------------------*/
 static void dwav_usb_mt_report(struct dwav_usb_mt *dwav_usb_mt)
 {
@@ -147,10 +183,20 @@ static void dwav_usb_mt_report(struct dwav_usb_mt *dwav_usb_mt)
 		if (dwav_usb_mt->finger[id].status != TS_EVENT_RELEASE) {
 			input_mt_report_slot_state(dwav_usb_mt->input,
 					MT_TOOL_FINGER, true);
-			input_report_abs(dwav_usb_mt->input,
+			if (touch_invert_x)
+				input_report_abs(dwav_usb_mt->input,
+					ABS_MT_POSITION_X,
+				max_x - dwav_usb_mt->finger[id].x);
+			else
+				input_report_abs(dwav_usb_mt->input,
 					ABS_MT_POSITION_X,
 					dwav_usb_mt->finger[id].x);
-			input_report_abs(dwav_usb_mt->input,
+			if (touch_invert_y)
+				input_report_abs(dwav_usb_mt->input,
+					ABS_MT_POSITION_Y,
+				max_y - dwav_usb_mt->finger[id].y);
+			else
+				input_report_abs(dwav_usb_mt->input,
 					ABS_MT_POSITION_Y,
 					dwav_usb_mt->finger[id].y);
 			input_report_abs(dwav_usb_mt->input,