Add displaylink

src/displaylink/udev.sh

@@ -0,0 +1,79 @@
+#!/bin/sh
+# Copyright (c) 2016 DisplayLink (UK) Ltd.
+# File autogenerated by udev-installer.sh script
+
+get_evdi_dev_count()
+{
+  if [ "$(ls -l /sys/devices/platform/* | grep evdi | wc -l)" = "0" ]; then
+    echo "0"
+    return
+  fi
+
+  cat /sys/devices/platform/evdi.*/drm/card*/card*/status | grep "^connected$" | wc -l
+}
+
+get_displaylink_dev_count()
+{
+  cat /sys/bus/usb/devices/*/idVendor | grep 17e9 | wc -l
+}
+
+start_displaylink()
+{
+  if [ "$(get_displaylink_dev_count)" != "0" ]; then
+    start_service
+  fi
+}
+
+try_stop_displaylink()
+{
+  if [ "$(get_evdi_dev_count)" = "0" ]; then
+    parent_dev_path="$1"
+    if [ -d "$parent_dev_path" ]; then
+      echo "1"
+      return
+    fi
+
+    if [ "$(get_displaylink_dev_count)" = "0" ]; then
+      stop_service
+      echo "0"
+      return
+    fi
+  fi
+  echo "1"
+}
+
+stop_displaylink()
+{
+  parent_devpath=$(dirname /sys$1)
+  retry_num="50" # 5s
+  while [ "$(try_stop_displaylink $parent_devpath)" != "0" ] && [ "$retry_num" != "0" ];
+  do
+    sleep 0.1
+    retry_num=$((retry_num-1))
+  done
+}
+
+main()
+{
+  op=$1
+  devpath=$2
+  if [ "$op" = "START" ]; then
+    start_displaylink
+  elif [ "$op" = "STOP" ]; then
+    stop_displaylink $devpath
+  fi
+}
+
+start_service()
+{
+  systemctl start displaylink.service
+}
+
+stop_service()
+{
+  systemctl stop displaylink.service
+}
+
+
+main $1 $2
+