Patch elographics for our elotouch screen

gistfile1.txt

*** Enable src deps...
sudo nano /etc/apt/sources.list
sudo apt update
*** Install package deps
sudo apt build-dep xserver-xorg-input-elographics
*** Download package source (without root!)
apt source xserver-xorg-input-elographics
*** Apply patch inside xserver-xorg-input-elographics-1.4.1 folder
patch -p1 < xxx.patch 
*** Rebuild package inside xserver-xorg-input-elographics-1.4.1 folder
dpkg-buildpackage -us -uc
*** Install our custom build package
sudo apt install ./xserver-xorg-input-elographics_1.4.1-1_armhf.deb
*************************************

--- xserver-xorg-input-elographics-1.4.1.orig/src/xf86Elo.c
+++ xserver-xorg-input-elographics-1.4.1/src/xf86Elo.c
@@ -358,6 +358,7 @@
            */
           cur_x = WORD_ASSEMBLY(priv->packet_buf[3], priv->packet_buf[4]);
           cur_y = WORD_ASSEMBLY(priv->packet_buf[5], priv->packet_buf[6]);
+          cur_y = (priv->max_y+priv->min_y) - cur_y;
           state = priv->packet_buf[2] & 0x07;

           /*