beagleboard: add basic audio mixer defaults

We need a generic alsa based mechanism that we can use a bbappend to save
default mixer controls per bsp. Until that is ready, this ensures the Audio Out
on the Beagleboard is enabled out of the box.

Signed-off-by: Darren Hart <dvhart@linux.intel.com>

meta-yocto/conf/machine/beagleboard.conf

@@ -9,6 +9,9 @@ XSERVER = "xserver-kdrive-fbdev"
 # Ship all kernel modules by default
 MACHINE_EXTRA_RRECOMMENDS = " kernel-modules"
 
+# Setup sane default mixer settings
+MACHINE_EXTRA_RRECOMMENDS += "beagleboard-audio"
+
 # Allow for MMC booting (required by the NAND-less Beagleboard XM)
 EXTRA_IMAGEDEPENDS += "u-boot x-load"
 

meta-yocto/recipes-bsp/beagleboard-audio/beagleboard-audio.bb

@@ -0,0 +1,30 @@
+SUMMARY = "Provide a basic init script to enable audio"
+DESCRIPTION = "Set the volume and unmute the Front mixer setting during boot."
+SECTION = "base"
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COREBASE}/LICENSE;md5=3f40d7994397109285ec7b81fdeb3b58"
+
+PR = "r4"
+
+inherit update-rc.d
+
+RDEPENDS = "alsa-utils-amixer"
+
+SRC_URI = "file://beagleboard-audio"
+
+INITSCRIPT_NAME = "beagleboard-audio"
+INITSCRIPT_PARAMS = "defaults 90"
+
+do_install() {
+	install -d ${D}${sysconfdir} \
+	           ${D}${sysconfdir}/init.d
+	install -m 0755 ${WORKDIR}/beagleboard-audio ${D}${sysconfdir}/init.d
+        cat ${WORKDIR}/${INITSCRIPT_NAME} | \
+            sed -e 's,/etc,${sysconfdir},g' \
+                -e 's,/usr/sbin,${sbindir},g' \
+                -e 's,/var,${localstatedir},g' \
+                -e 's,/usr/bin,${bindir},g' \
+                -e 's,/usr,${prefix},g' > ${D}${sysconfdir}/init.d/${INITSCRIPT_NAME}
+        chmod 755 ${D}${sysconfdir}/init.d/${INITSCRIPT_NAME}
+}
+

meta-yocto/recipes-bsp/beagleboard-audio/beagleboard-audio/beagleboard-audio

@@ -0,0 +1,44 @@
+#!/bin/sh
+### BEGIN INIT INFO
+# Provides:          beagleboard mixer setup
+# Required-Start:    $syslog
+# Required-Stop:     $syslog
+# Default-Start:     2 3 4 5
+# Default-Stop:      0 1 6
+# Short-Description: Initialize the beagleboard audio mixer
+# Description:       Unmute FRONT and set volume to ~70%.
+### END INIT INFO
+
+# Author: Darren Hart <dvhart@linux.intel.com>
+# Based on /etc/init.d/skeleton
+
+PATH=/sbin:/usr/sbin:/bin:/usr/bin
+DESC="Audio mixer settings"
+NAME=beagleboard-audio
+AMIXER=`which amixer`
+SCRIPTNAME=/etc/init.d/$NAME
+
+# Exit if amixer is not installed
+[ -x "$AMIXER" ] || exit 0
+
+do_start() {
+	# Enable the Headset (Audio Out)
+	$AMIXER sset "Headset" 2 > /dev/null
+	$AMIXER sset "HeadsetL Mixer AudioL1" on > /dev/null
+	$AMIXER sset "HeadsetR Mixer AudioR1" on > /dev/null
+}
+
+case "$1" in
+start)
+	echo "$NAME: setting default mixer settings."
+	do_start
+	;;
+stop)
+	;;
+*)
+	echo "Usage: $SCRIPTNAME {start|stop}" >&2
+	exit 3
+	;;
+esac
+
+exit 0