provide led state save and restore functionality scripts and service

lib/distributions.sh

@@ -429,6 +429,7 @@ FAMILY_TWEAKS
 	chroot "${SDCARD}" /bin/bash -c "systemctl --no-reload enable armbian-ramlog.service >/dev/null 2>&1"
 	chroot "${SDCARD}" /bin/bash -c "systemctl --no-reload enable armbian-resize-filesystem.service >/dev/null 2>&1"
 	chroot "${SDCARD}" /bin/bash -c "systemctl --no-reload enable armbian-hardware-monitor.service >/dev/null 2>&1"
+	chroot "${SDCARD}" /bin/bash -c "systemctl --no-reload enable armbian-led-state.service >/dev/null 2>&1"
 
 	# copy "first run automated config, optional user configured"
  	cp "${SRC}"/packages/bsp/armbian_first_run.txt.template "${SDCARD}"/boot/armbian_first_run.txt.template

lib/makeboarddeb.sh

@@ -255,7 +255,7 @@ fi
 	fi
 
 	# Reload services
-	systemctl --no-reload enable armbian-hardware-monitor.service armbian-hardware-optimize.service armbian-zram-config.service >/dev/null 2>&1
+	systemctl --no-reload enable armbian-hardware-monitor.service armbian-hardware-optimize.service armbian-zram-config.service armbian-led-state.service >/dev/null 2>&1
 	exit 0
 	EOF
 

packages/bsp/common/lib/systemd/system/armbian-led-state.service

@@ -0,0 +1,21 @@
+# Armbian led state save and restore
+# Stores the current led state at shutdown and restores
+# it during bootstrap
+
+[Unit]
+Description=Armbian leds state
+Before=sysinit.target
+After=local-fs.target
+Conflicts=shutdown.target
+DefaultDependencies=no
+
+[Service]
+Type=oneshot
+RemainAfterExit=true
+ReadWritePaths=/sys/class/leds
+ExecStart=/usr/lib/armbian/armbian-led-state-restore.sh
+ExecStop=/usr/lib/armbian/armbian-led-state-save.sh
+
+[Install]
+WantedBy=basic.target
+

packages/bsp/common/usr/lib/armbian/armbian-led-state-restore.sh

@@ -0,0 +1,68 @@
+#!/bin/bash
+#
+# Copyright (c) Authors: https://www.armbian.com/authors
+#
+# This file is licensed under the terms of the GNU General Public
+# License version 2. This program is licensed "as is" without any
+# warranty of any kind, whether express or implied.
+
+STATE_PATH="$1"
+[[ -z "$1" ]] && STATE_PATH="/etc/armbian-leds.conf"
+
+REGEX_BLANK_LINE=$'^\s*$'
+REGEX_COMMENT_LINE=$'^#.*$'
+REGEX_EXTRACT=$'\[(.*)\]'
+REGEX_PARSE=$'(.*)=(.*)'
+
+LED=""
+
+if [[ ! -f $STATE_PATH ]]; then
+	echo "File $STATE_PATH not found, nothing to do"
+	exit 0
+fi
+
+while read LINE; do
+	
+	# Blank lines and lines starting with "#" are ignored
+	[[ "$LINE" =~ $REGEX_BLANK_LINE ]] && continue
+	[[ "$LINE" =~ $REGEX_COMMENT_LINE ]] && continue
+
+	# When line matches the [...] style, assign the content as led base path
+	if [[ "$LINE" =~ $REGEX_EXTRACT ]]; then 
+		LED=${BASH_REMATCH[1]}
+		continue
+	fi
+
+	if [[ -z "$LED" ]]; then
+		echo "Invalid state file, no led path stanza found"
+		exit 1
+	fi
+
+	[[ "$LINE" =~ $REGEX_PARSE ]]
+
+	PARAM=${BASH_REMATCH[1]}
+	VALUE=${BASH_REMATCH[2]}
+
+	if [[ -z $PARAM || -z $VALUE ]]; then
+		echo "Invalid state file, syntax error in configuration file "
+		exit 1
+	fi
+
+	# Ignore brightness=0 param, this will reset trigger to none
+	[[ $PARAM == "brightness" && $VALUE -eq 0 ]] && continue
+
+	# Verify the led parameter exists and is writable, otherwise skip to next param
+	if [[ ! -w "$LED/$PARAM" ]]; then
+		echo "warning: $LED/$PARAM could not be restored"
+		continue
+	fi
+
+	# Workaround for trigger=none: led does not clear if trigger is already none.
+	# Set it to default-on, then will be reset immediately to none to turn it off
+	[[ "$PARAM" == "trigger" && "$VALUE" == "none" ]] && echo "default-on" > "$LED/$PARAM"
+
+	echo "$VALUE" > "$LED/$PARAM"
+
+done < $STATE_PATH
+
+exit 0

packages/bsp/common/usr/lib/armbian/armbian-led-state-save.sh

@@ -0,0 +1,62 @@
+#!/bin/bash
+#
+# Copyright (c) Authors: https://www.armbian.com/authors
+#
+# This file is licensed under the terms of the GNU General Public
+# License version 2. This program is licensed "as is" without any
+# warranty of any kind, whether express or implied.
+
+STATE_PATH="$1"
+[[ -z "$1" ]] && STATE_PATH="/etc/armbian-leds.conf"
+
+# Regular expression to extract the trigger from the led trigger file
+REGEX=$'\[(.*)\]'
+
+CMD_FIND=$(which find)
+
+# Retrieve the trigger for a specific led and stores the entry in a destination state file
+# Also retrieve all the writable parameters for a led and stores them in a destination state file
+# $1 = base led path 
+# $2 = path of destination state file
+function store_led() {
+	
+	PATH="$1"
+	TRIGGER_PATH="$1/trigger"
+	DESTINATION="$2"
+
+	TRIGGER_CONTENT=$(<$TRIGGER_PATH)
+
+	[[ "$TRIGGER_CONTENT" =~ $REGEX ]]
+
+	TRIGGER_VALUE=${BASH_REMATCH[1]}
+
+	echo "[$LED]" >> $STATE_PATH
+	echo "trigger=$TRIGGER_VALUE" >> $DESTINATION
+
+	# In case the trigger is any of the kbd-*, don't store any other parameter
+	# This avoids num/scroll/capslock from being restored at startup
+	[[ "$TRIGGER_VALUE" =~ kbd-* ]] && return
+
+	COMMAND_PARAMS="$CMD_FIND $PATH/ -maxdepth 1 -type f ! -iname uevent ! -iname trigger -perm /u+w -printf %f\\n"
+	PARAMS=$($COMMAND_PARAMS)
+
+	for PARAM in $PARAMS; do
+
+		PARAM_PATH="$PATH/$PARAM"
+		VALUE=$(<$PARAM_PATH)
+
+		echo "$PARAM=$VALUE" >> $DESTINATION
+
+	done
+
+}
+
+# zeroing current state file if existing
+[[ -f $STATE_PATH ]] && echo -n > $STATE_PATH
+
+for LED in /sys/class/leds/*; do
+
+	store_led $LED $STATE_PATH
+	echo >> $STATE_PATH
+
+done