busybox: add getedid script for RPi

The getedid script supports the "create" and "delete" options like
the x86 version.

It makes use of the "dump-active-edids", "create-edid-cpio" and
"update-bootloader-edid" scripts and can be used as is on other
DRM platforms as well as it doesn't contain any RPi specific code.

Signed-off-by: Matthias Reichl <hias@horus.com>

packages/sysutils/busybox/package.mk

@@ -130,6 +130,7 @@ makeinstall_target() {
     cp ${PKG_DIR}/scripts/create-edid-cpio ${INSTALL}/usr/bin/
     if [ "${PROJECT}" = "RPi" ]; then
       cp ${PKG_DIR}/scripts/update-bootloader-edid-rpi ${INSTALL}/usr/bin/update-bootloader-edid
+      cp ${PKG_DIR}/scripts/getedid-drm ${INSTALL}/usr/bin/getedid
     fi
     cp ${PKG_DIR}/scripts/createlog ${INSTALL}/usr/bin/
     cp ${PKG_DIR}/scripts/dthelper ${INSTALL}/usr/bin

packages/sysutils/busybox/scripts/getedid-drm

@@ -0,0 +1,55 @@
+#!/bin/sh
+
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2021-present Team LibreELEC (https://libreelec.tv)
+
+usage() {
+  echo "$0 create|delete|help"
+}
+
+delete_edid() {
+  update-bootloader-edid delete
+  if [ $? -eq 0 ]; then
+    echo "successfully removed edid override"
+  else
+    echo "error removing bootloader edid-override options"
+    exit 1
+  fi
+}
+
+create_edid() {
+  CONNECTORS=$(dump-active-edids -q)
+  if [ $? -ne 0 -o -z "${CONNECTORS}" ]; then
+    echo "error: cannot detemine active connectors"
+    exit 1
+  fi
+  create-edid-cpio -q
+  if [ $? -ne 0 ]; then
+    echo "error creating edid.cpio"
+    exit 1
+  fi
+  update-bootloader-edid set ${CONNECTORS}
+  if [ $? -eq 0 ]; then
+    echo "successfully installed edid override for ${CONNECTORS}"
+  else
+    echo "error setting bootloader edid-override options"
+    exit 1
+  fi
+}
+
+case $1 in
+  create)
+    shift
+    create_edid "$@"
+    ;;
+  delete)
+    delete_edid
+    ;;
+  help)
+    usage
+    ;;
+  *)
+    usage
+    exit 1
+    ;;
+esac