96 lines
1.7 KiB
Bash
96 lines
1.7 KiB
Bash
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#!/bin/sh
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# Copyright (c) 2016 - 2020 DisplayLink (UK) Ltd.
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# File autogenerated by udev-installer.sh script
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get_displaylink_dev_count()
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{
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cat /sys/bus/usb/devices/*/idVendor | grep 17e9 | wc -l
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}
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get_displaylink_symlink_count()
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{
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root=$1
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if [ ! -d "$root/displaylink/by-id" ]; then
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echo "0"
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return
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fi
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for f in $(find $root/displaylink/by-id -type l -exec realpath {} \; 2> /dev/null); do
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test -c $f && echo $f;
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done | wc -l
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}
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start_displaylink()
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{
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if [ "$(get_displaylink_dev_count)" != "0" ]; then
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start_service
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fi
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}
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stop_displaylink()
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{
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root=$1
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if [ "$(get_displaylink_symlink_count $root)" = "0" ]; then
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stop_service
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fi
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}
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remove_dldir_if_empty()
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{
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root=$1
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(cd $root; rmdir -p --ignore-fail-on-non-empty displaylink/by-id)
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}
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create_displaylink_symlink()
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{
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root=$1
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device_id=$2
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devnode=$3
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mkdir -p $root/displaylink/by-id
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ln -sf $devnode $root/displaylink/by-id/$device_id
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}
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unlink_displaylink_symlink()
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{
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root=$1
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devname=$2
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for f in $root/displaylink/by-id/*; do
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if [ ! -e "$f" ] || ([ -L "$f" ] && [ "$f" -ef "$devname" ]); then
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unlink "$f"
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fi
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done
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(cd $root; rmdir -p --ignore-fail-on-non-empty displaylink/by-id)
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}
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prune_broken_links()
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{
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root=$1
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dir="$root/displaylink/by-id"
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find -L "$dir" -name "$dir" -o type d -prune -o -type -l -exec rm {} +
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remove_dldir_if_empty $root
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}
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main()
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{
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action=$1
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root=$2
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devnode=$4
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if [ "$action" = "add" ]; then
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device_id=$3
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create_displaylink_symlink $root $device_id $devnode
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start_displaylink
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elif [ "$action" = "remove" ]; then
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devname=$3
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unlink_displaylink_symlink "$root" "$devname"
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stop_displaylink "$root"
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elif [ "$action" = "START" ]; then
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start_displaylink
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fi
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}
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