weston-init: support weston touch calibration

Add a new PACKAGECONFIG touchscreen-calibration, when it's enabled,
add the following fields in weston.ini:
```
[libinput]
enable_tap=true
touchscreen_calibrator=true
calibration_helper=/usr/bin/toradex-save-touchscreen-calibration
```

When weston-touch-calibrator is called by an end user,
/usr/bin/toradex-save-touchscreen-calibration will be triggered to
create a udev rule to export LIBINPUT_CALIBRATION_MATRIX then trigger
that udev rule. The end users need to restart weston to let the new
calibration matrix to take effect.

Related-to: ELB-4570

Signed-off-by: Ming Liu <ming.liu@toradex.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/recipes-graphics/wayland/weston-init/toradex-save-touchscreen-calibration.sh b/recipes-graphics/wayland/weston-init/toradex-save-touchscreen-calibration.sh
new file mode 100755
index 0000000..e2871fc
--- /dev/null
+++ b/recipes-graphics/wayland/weston-init/toradex-save-touchscreen-calibration.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+
+if [ "$#" -ne 7 ]; then
+	echo "This script is to be called by weston with new touch calibration data, it requires 7 parameters."
+	exit 1
+fi
+
+echo 'ACTION=="add|change", SUBSYSTEM=="input", KERNEL=="event[0-9]*", ENV{ID_INPUT_TOUCHSCREEN}=="1", ENV{LIBINPUT_CALIBRATION_MATRIX}=''"'"$2 $3 $4 $5 $6 $7"'"' > /etc/udev/rules.d/libinput.rules
+
+# Make udev process the new rule by triggering a "change" event:
+udevadm trigger "$1"