FirePrime Linux: How to add input support for touch-screen

Firefly

FirePrime Linu: How to add input support for touch-screen
By Busybee

1.1 Brief

Window system X11 uses “evdev” to handle the touch even. How to add the support for the touch screen? It requires the following two steps:

1.1.1 Add  X11 config file,specify evdev driver for touch screen devices.
1.1.2 Improve evdev driver supports itself for touch screen,  adding support for simulate right mouse button.

1.2 Configuration

Create a new file /etc/X11/xorg.conf.d/10-evdev-gslX680.conf，add the following：

1. Section "InputClass"
   
2.         Identifier "gslX680 evdev touchscreen"
   
3.         MatchProduct    "gslX680"
   
4.         MatchDevicePath "/dev/input/event*"
   
5.         Option "EmulateThirdButton" "true"
   
6.         Option "EmulateThirdButtonTimeout" "500"
   
7.         Option "EmulateThirdButtonMoveThreshold" "50"
   
8.         Driver "evdev"
   
9. EndSection

Copy the code

1.3 Improve the touch screen support of evdev driver


The system evdev driver can not support the android touch screen input driver very well.Need to path and recompile, the following describes the detail steps:

1.3.1 Install compiling tools environment and relevant dependent libraries

1. sudo apt-get install build-essentials
   
2. sudo apt-get build-dep xserver-xorg-input-evdev

Copy the code

1.3.2 Extract the source code,patch and compile

1. sudo apt-get source xserver-xorg-input-evdev
   
2. cd xserver-xorg-input-evdev-2.9.0/src
   
3. GITHUB=https://github.com/TeeFirefly/xf86-input-evdev/tree/ba37709e2aab50354c9925ca1e975779a16c67dc
   
4. wget $GITHUB/src/emuThird.c
   
5. wget $GITHUB/src/evdev.c
   
6. wget $GITHUB/src/evdev.h
   
7. cd ..
   
8. make -j4

Copy the code

1.3.3 Install the compiled module

1. mv /usr/lib/xorg/modules/input/evdev_drv.so /usr/lib/xorg/modules/input/evdev_drv.so.orig
   
2. cp src/.libs/evdev_drv.so /usr/lib/xorg/modules/input/evdev_drv.so

Copy the code

Reboot the system to take effect.