From ab53910278f76fd9e3e3127708360a42c59fc512 Mon Sep 17 00:00:00 2001
From: dakkar <dakkar@thenautilus.net>
Date: Fri, 5 Jul 2019 12:17:54 +0100
Subject: probably-working displaylink driver

upgraded from
https://git.hossie.de/projects/GEN/repos/gentoo-overlay/browse/x11-drivers/
which was inspired by
https://aur.archlinux.org/cgit/aur.git/tree/?h=displaylink
---
 x11-drivers/displaylink-driver/files/udev.sh | 77 ++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 x11-drivers/displaylink-driver/files/udev.sh

(limited to 'x11-drivers/displaylink-driver/files/udev.sh')

diff --git a/x11-drivers/displaylink-driver/files/udev.sh b/x11-drivers/displaylink-driver/files/udev.sh
new file mode 100644
index 0000000..8570bd1
--- /dev/null
+++ b/x11-drivers/displaylink-driver/files/udev.sh
@@ -0,0 +1,77 @@
+#!/bin/sh
+# Copyright (c) 2016 DisplayLink (UK) Ltd.
+# File autogenerated by udev-installer.sh script
+# modified by dakkar
+
+get_evdi_dev_count()
+{
+  if [ "$(ls -ld /sys/devices/platform/* | grep -c evdi)" = "0" ]; then
+    echo "0"
+    return
+  fi
+
+  cat /sys/devices/platform/evdi.*/drm/card*/card*/status | grep "^connected$" | 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()
+{
+  rc-service dlm start
+}
+
+stop_service()
+{
+  rc-service dlm stop
+}
+main "$1" "$2"
-- 
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