gluon-setup-mode: provide LED feedback for setup-mode activation

This adds a fast-blink animation when Gluon started the procedure to
enter setup mode.

This is helpful, as some devices might not provide feedback by the
status LED on reboot. This can lead to unwanted activation of a
bootloader recovery procedure.

Signed-off-by: David Bauer <mail@david-bauer.net>

Author: blocktrron

package/gluon-setup-mode/files/etc/hotplug.d/button/50-gluon-setup-mode

@@ -6,6 +6,7 @@ wait=3
 
 wait_setup_mode() {
 	sleep $wait
+	/lib/gluon/setup-mode/led.sh confirm
 	gluon-enter-setup-mode
 }
 

package/gluon-setup-mode/files/lib/gluon/setup-mode/led.sh

@@ -0,0 +1,37 @@
+#!/bin/sh
+
+# shellcheck disable=SC1091,SC2154
+
+get_setup_mode_led() {
+	. /etc/diag.sh
+	get_status_led 2> /dev/null
+
+	if [ -z "$status_led" ]; then
+		status_led="$running"
+	fi
+
+	if [ -z "$status_led" ]; then
+		status_led="$boot"
+	fi
+
+	custom_led="$(lua -e 'print(require("gluon.setup-mode").get_status_led() or "")')"
+	if [ -z "$status_led" ]; then
+		status_led="$custom_led"
+	fi
+}
+
+MODE="$1"
+case "$mode" in
+	confirm)
+		get_setup_mode_led 2> /dev/null
+		status_led_set_timer 100 100
+		;;
+	running)
+		get_setup_mode_led 2> /dev/null
+		status_led_set_timer 1000 300
+		;;
+	*)
+		echo "Usage: $0 <running|confirm>"
+		exit 1
+		;;
+esac

package/gluon-setup-mode/files/lib/gluon/setup-mode/rc.d/S96led

@@ -1,30 +1,8 @@
 #!/bin/sh /etc/rc.common
 
-# shellcheck disable=SC1091,SC2154
-
 START=96
 
 start() {
-	local custom_led
-
 	/etc/init.d/led start
-
-	. /etc/diag.sh
-
-	get_status_led 2> /dev/null
-
-	if [ -z "$status_led" ]; then
-		status_led="$running"
-	fi
-
-	if [ -z "$status_led" ]; then
-		status_led="$boot"
-	fi
-
-	custom_led="$(lua -e 'print(require("gluon.setup-mode").get_status_led() or "")')"
-	if [ -z "$status_led" ]; then
-		status_led="$custom_led"
-	fi
-
-	status_led_set_timer 1000 300
+	/lib/gluon/setup-mode/led.sh running
 }