en:c1_tft_touch [ODROID Wiki]

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==== Test your Touchscreen ====
Create a new udev file
  sudo vi /etc/udev/rules.d/95-ads7846.rules
  
and then, add this lines and save it\\
  SUBSYSTEM=="input", ATTRS{name}=="ADS7846 Touchscreen", ENV{DEVNAME}=="*event*", SYMLINK+="input/touchscreen"

Load SPI and TS drivers.
  sudo modprobe spicc
  sudo modprobe -r ads7846
  sudo modprobe ads7846

Now you can see this node.
  ls /dev/input/touchscreen

Install the event test and touchscreen library
  sudo apt-get install evtest tslib libts-bin

Now you can use some tools such as sudo evtest /dev/input/touchscreen which will let you see touchscreen events in real time, press on the touchscreen to see the reports.
  sudo evtest /dev/input/touchscreen
==== Manual Calibration ====
Run startx
  sudo startx &

Run ts_calibrate on /dev/fb2
  sudo TSLIB_FBDEVICE=/dev/fb2 TSLIB_TSDEVICE=/dev/input/touchscreen ts_calibrate

Follow the directions on the screen, touching each point.\\
Then, you can run following command.
  sudo TSLIB_FBDEVICE=/dev/fb2 TSLIB_TSDEVICE=/dev/input/touchscreen ts_test

==== X Calibration ====
1. The xinput-calibrator pakage download
  sudo apt-get install xinput-calibrator

2. Remove old calibration data.
  sudo rm /etc/X11/xorg.conf.d/99-calibration.conf

3. Run calibrator\\
You need to check DISPLAY=:N.0
  sudo FRAMEBUFFER=/dev/fb2 startx &
  sudo DISPLAY=:0.0 xinput_calibrator

Follow the directions on your screen.\\
then, you will get something like\\

{{:en:c1:xinput_calibrator.png?500|}}\\

Copy to "/etc/X11/xorg.conf.d/99-calibration.conf"
  sudo mkdir /etc/X11/xorg.conf.d/
  sudo vi /etc/X11/xorg.conf.d/99-calibration.conf

4. Reboot
  sudo reboot