meta-nuc: init script for configuring HDMI audio

Provide an init script to check at boot time which HDMI port is connected
and configure the default ALSA audio out to that port.

Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>
Signed-off-by: Tom Zanussi <tom.zanussi@intel.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/meta-nuc/recipes-core/initscripts/initscripts/hdmi_port_audio.sh b/meta-nuc/recipes-core/initscripts/initscripts/hdmi_port_audio.sh
new file mode 100644
index 00000000..69d8a53f
--- /dev/null
+++ b/meta-nuc/recipes-core/initscripts/initscripts/hdmi_port_audio.sh
@@ -0,0 +1,28 @@
+#!/bin/sh
+### BEGIN INIT INFO
+# Provides:
+# Required-Start:
+# Required-Stop:
+# Default-Start:     S
+# Default-Stop:
+# Short-Description: Configure ALSA audio output to the connected HDMI port
+### END INIT INFO
+
+#
+# If both HDMI ports are connected then use HDMI0 for default ALSA audio out..
+
+ALSA_CONF_FILE="/etc/asound.conf"
+
+HDMI0_STATUS_FILE="/sys/class/drm/card0-HDMI-A-1/status"
+HDMI1_STATUS_FILE="/sys/class/drm/card0-HDMI-A-2/status"
+
+HDMI0_ALSA_CONF="hw:0,3"
+HDMI1_ALSA_CONF="hw:0,7"
+
+if [ -f "${HDMI0_STATUS_FILE}" ] && [ "`cat ${HDMI0_STATUS_FILE}`" == "connected" ]
+then
+        sed -i "s/pcm *\"hw:[0-9]*,[0-9]*\"/pcm \"${HDMI0_ALSA_CONF}\"/" ${ALSA_CONF_FILE}
+elif [ -f "${HDMI1_STATUS_FILE}" ] && [ "`cat ${HDMI1_STATUS_FILE}`" == "connected" ]
+then
+        sed -i "s/pcm \"hw:[0-9]*,[0-9]*\"/pcm \"${HDMI1_ALSA_CONF}\"/" ${ALSA_CONF_FILE}
+fi