From fca507d316ded1e3126ba6db265b7fe871550fae Mon Sep 17 00:00:00 2001
From: Jose Diaz de Grenu de Pedro <Jose.DiazdeGrenudePedro@digi.com>
Date: Tue, 8 Mar 2016 18:36:49 +0100
Subject: [PATCH] meta-digi-dey: pulseaudio: add HDMI audio sink on hotplug

This patch adds a udev rule and a script to detect HDMI hotplug and create
the HDMI audio pulseaudio sink if needed (that is, if the system was
booted with no HDMI cable plugged).

https://jira.digi.com/browse/DEL-2327

Signed-off-by: Jose Diaz de Grenu de Pedro <Jose.DiazdeGrenudePedro@digi.com>
---
 .../pulseaudio/pulseaudio/hdmi_hotplug.sh      | 18 ++++++++++++++++++
 .../pulseaudio/pulseaudio_%.bbappend           | 14 ++++++++++++++
 2 files changed, 32 insertions(+)
 create mode 100644 meta-digi-dey/recipes-multimedia/pulseaudio/pulseaudio/hdmi_hotplug.sh

diff --git a/meta-digi-dey/recipes-multimedia/pulseaudio/pulseaudio/hdmi_hotplug.sh b/meta-digi-dey/recipes-multimedia/pulseaudio/pulseaudio/hdmi_hotplug.sh
new file mode 100644
index 000000000..63ce0772e
--- /dev/null
+++ b/meta-digi-dey/recipes-multimedia/pulseaudio/pulseaudio/hdmi_hotplug.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+#
+# Called from udev on HDMI plug/unplug event
+
+# Find HDMI card number
+for card in /sys/class/sound/card*; do
+	if readlink ${card}/device | grep -qs hdmi; then
+		HDMI_CARD="${card##/sys/class/sound/card}"
+	fi
+done
+
+# On HDMI plugin event, if the sink has not been loaded yet, load the
+# HDMI audio sink from ALSA
+if [ "${EVENT}" = "plugin" ]; then
+	if ! pactl list sinks | grep -qs "imx-hdmi-soc"; then
+		pactl load-module module-alsa-sink device=hw:${HDMI_CARD}
+	fi
+fi
diff --git a/meta-digi-dey/recipes-multimedia/pulseaudio/pulseaudio_%.bbappend b/meta-digi-dey/recipes-multimedia/pulseaudio/pulseaudio_%.bbappend
index 8c02716bc..47dc37227 100644
--- a/meta-digi-dey/recipes-multimedia/pulseaudio/pulseaudio_%.bbappend
+++ b/meta-digi-dey/recipes-multimedia/pulseaudio/pulseaudio_%.bbappend
@@ -1,2 +1,16 @@
+FILESEXTRAPATHS_prepend := "${THISDIR}/${BPN}:"
+
+SRC_URI += "file://hdmi_hotplug.sh"
+
 # Do not include module-udev-detect so that module-detect is used instead
 RDEPENDS_pulseaudio-server_remove = "pulseaudio-module-udev-detect"
+
+do_install_append() {
+	install -d ${D}${sysconfdir}/udev/scripts
+	install -m 0755 ${WORKDIR}/hdmi_hotplug.sh ${D}${sysconfdir}/udev/scripts
+
+	cat >> ${D}${base_libdir}/udev/rules.d/90-pulseaudio.rules <<-_EOL_
+
+		SUBSYSTEM=="platform", KERNEL=="*hdmi_video", ACTION=="change", RUN+="/etc/udev/scripts/hdmi_hotplug.sh"
+	_EOL_
+}