67 lines
2.8 KiB
Bash
67 lines
2.8 KiB
Bash
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#!/bin/bash
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# Copyright 2018 Collabora, Ltd.
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# Copyright 2018 General Electric Company
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice (including the
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# next paragraph) shall be included in all copies or substantial
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# portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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# This is an example script working as Weston's calibration helper.
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# Its purpose is to permanently store the calibration matrix for the given
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# touchscreen input device into a udev property. Since this script naturally
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# runs as the user that runs Weston, it presumably cannot write directly into
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# /etc. It is left for the administrator to set up appropriate files and
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# permissions.
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# To use this script, one needs to edit weston.ini, in section [libinput], add:
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# calibration_helper=/path/to/bin/calibration-helper.bash
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# exit immediately if any command fails
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set -e
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# The arguments Weston gives us:
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SYSPATH="$1"
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MATRIX="$2 $3 $4 $5 $6 $7"
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# Pick something to recognize the right touch device with.
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# Usually one would use something like a serial.
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SERIAL=$(udevadm info "$SYSPATH" --query=property | \
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awk -- 'BEGIN { FS="=" } { if ($1 == "ID_SERIAL") { print $2; exit } }')
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# If cannot find a serial, tell the server to not use the new calibration.
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[ -z "$SERIAL" ] && exit 1
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# You'd have this write a file instead.
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echo "ACTION==\"add|change\",SUBSYSTEM==\"input\",ENV{ID_SERIAL}==\"$SERIAL\",ENV{LIBINPUT_CALIBRATION_MATRIX}=\"$MATRIX\""
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# Then you'd tell udev to reload the rules:
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#udevadm control --reload
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# This lets Weston get the new calibration if you unplug and replug the input
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# device. Instead of writing a udev rule directly, you could have a udev rule
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# with IMPORT{file}="/path/to/calibration", write
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# "LIBINPUT_CALIBRATION_MATRIX=\"$MATRIX\"" into /path/to/calibration instead,
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# and skip this reload step.
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# Make udev process the new rule by triggering a "change" event:
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#udevadm trigger "$SYSPATH"
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# If you were to restart Weston without rebooting, this lets it pick up the new
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# calibration.
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