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#!/bin/sh
#
# alsa-utils initscript
#
### BEGIN INIT INFO
# Provides:          alsa-utils
# Required-Start:    $local_fs $remote_fs
# Required-Stop:     $remote_fs
# Default-Start:     S
# Default-Stop:      0 1 6
# Short-Description: Restore and store ALSA driver settings
# Description:       This script stores and restores mixer levels on
#                    shutdown and bootup.On sysv-rc systems: to
#                    disable storing of mixer levels on shutdown,
#                    remove /etc/rc[06].d/K50alsa-utils.  To disable
#                    restoring of mixer levels on bootup, rename the
#                    "S50alsa-utils" symbolic link in /etc/rcS.d/ to
#                    "K50alsa-utils".
### END INIT INFO

# Don't use set -e; check exit status instead

# Exit silently if package is no longer installed
[ -x /usr/sbin/alsactl ] || exit 0

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
MYNAME=/etc/init.d/alsa-utils
ALSACTLHOME=/run/alsa

[ -d "$ALSACTLHOME" ] || mkdir -p "$ALSACTLHOME"

. /lib/lsb/init-functions
. /usr/share/alsa/utils.sh

# $1 EXITSTATUS
# [$2 MESSAGE]
log_action_end_msg_and_exit()
{
	log_action_end_msg "$1" ${2:+"$2"}
	exit $1
}

# $1 PROGRAM
executable()
{
	# If which is not available then we must be running before
	# /usr is mounted on a system that has which in /usr/bin/.
	# Conclude that $1 is not executable.
	[ -x /bin/which ] || [ -x /usr/bin/which ] || return 1
	which "$1" >/dev/null 2>&1
}

executable amixer || { echo "${MYNAME}: Error: No amixer program available." >&2 ; exit 1 ; }

# $1 <card ID> | "all"
restore_levels()
{
	[ -f /var/lib/alsa/asound.state ] || return 1
	CARD="$1"
	[ "$1" = all ] && CARD=""
	# Assume that if alsactl prints a message on stderr
	# then it failed somehow.  This works around the fact
	# that alsactl doesn't return nonzero status when it
	# can't restore settings for the card
	if MSG="$(alsactl -E HOME="$ALSACTLHOME" -E XDG_RUNTIME_DIR="${ALSACTLRUNTIME}" restore $CARD 2>&1 >/dev/null)" && [ ! "$MSG" ] ; then
		return 0
	else
		# Retry with the "force" option.  This restores more levels
		# but it results in much longer error messages.
		alsactl -E HOME="$ALSACTLHOME" -E XDG_RUNTIME_DIR="${ALSACTLRUNTIME}" -F restore $CARD >/dev/null 2>&1
		log_action_cont_msg "warning: 'alsactl -E HOME="$ALSACTLHOME" -E XDG_RUNTIME_DIR="${ALSACTLRUNTIME}" restore${CARD:+ $CARD}' failed with error message '$MSG'"
		return 1
	fi
}

# $1 <card ID> | "all"
store_levels()
{
	CARD="$1"
	[ "$1" = all ] && CARD=""
	if MSG="$(alsactl -E HOME="$ALSACTLHOME" -E XDG_RUNTIME_DIR="${ALSACTLRUNTIME}" store $CARD 2>&1)" ; then
		sleep 1
		return 0
	else
		log_action_cont_msg "warning: 'alsactl store${CARD:+ $CARD}' -E HOME="$ALSACTLHOME" -E XDG_RUNTIME_DIR=@alsactlruntime@ failed with error message '$MSG'"
		return 1
	fi
}


# $1 <card ID>
mute_and_zero_levels_on_card()
{
	CARDOPT="-c $1"
	for CTL in \
		Master \
		PCM \
		Synth \
		CD \
		Line \
		Mic \
		"PCM,1" \
		Wave \
		Music \
		AC97 \
		"Master Digital" \
		DAC \
		"DAC,0" \
		"DAC,1" \
		Headphone \
		Speaker \
		Playback
	do
		mute_and_zero_level "$CTL"
	done
#	for CTL in \
#		"Audigy Analog/Digital Output Jack" \
#		"SB Live Analog/Digital Output Jack"
#	do
#		switch_control "$CTL" off
#	done
	return 0
}

# $1 <card ID> | "all"
mute_and_zero_levels()
{
	TTZML_RETURNSTATUS=0
	case "$1" in
	  all)
		for CARD in $(echo_card_indices) ; do
			mute_and_zero_levels_on_card "$CARD" || TTZML_RETURNSTATUS=1
		done
		;;
	  *)
		mute_and_zero_levels_on_card "$1" || TTZML_RETURNSTATUS=1
		;;
	esac
	return $TTZML_RETURNSTATUS
}


# $1 <card ID> | "all"
card_OK()
{
	[ "$1" ] || bugout
	if [ "$1" = all ] ; then
		[ -d /proc/asound ]
		return $?
	else
		[ -d "/proc/asound/card$1" ] || [ -d "/proc/asound/$1" ]
		return $?
	fi
}

# If a card identifier is provided in $2 then regard it as an error
# if that card is not present; otherwise don't regard it as an error.

case "$1" in
  start)
	EXITSTATUS=0
	TARGET_CARD="$2"
	case "$TARGET_CARD" in
	  ""|all) TARGET_CARD=all ; log_action_begin_msg "Setting up ALSA" ;;
	  *) log_action_begin_msg "Setting up ALSA card ${TARGET_CARD}" ;;
	esac
	card_OK "$TARGET_CARD" || log_action_end_msg_and_exit "$( [ ! "$2" ] ; echo $? ; )" "none loaded"
	preinit_levels "$TARGET_CARD" || EXITSTATUS=1
	if ! restore_levels "$TARGET_CARD" ; then
		sanify_levels "$TARGET_CARD" || EXITSTATUS=1
		restore_levels "$TARGET_CARD" >/dev/null 2>&1 || :
	fi
	log_action_end_msg_and_exit "$EXITSTATUS"
	;;
  stop)
	EXITSTATUS=0
	TARGET_CARD="$2"
	case "$TARGET_CARD" in
	  ""|all) TARGET_CARD=all ; log_action_begin_msg "Shutting down ALSA" ;;
	  *) log_action_begin_msg "Shutting down ALSA card ${TARGET_CARD}" ;;
	esac
	card_OK "$TARGET_CARD" || log_action_end_msg_and_exit "$( [ ! "$2" ] ; echo $? ; )" "none loaded"
	store_levels "$TARGET_CARD" || EXITSTATUS=1
	#mute_and_zero_levels "$TARGET_CARD" || EXITSTATUS=1
	log_action_end_msg_and_exit "$EXITSTATUS"
	;;
  restart|force-reload)
	EXITSTATUS=0
	$0 stop || EXITSTATUS=1
	$0 start || EXITSTATUS=1
	exit $EXITSTATUS
	;;
  reset)
	TARGET_CARD="$2"
	case "$TARGET_CARD" in
	  ""|all) TARGET_CARD=all ; log_action_begin_msg "Resetting ALSA" ;;
	  *) log_action_begin_msg "Resetting ALSA card ${TARGET_CARD}" ;;
	esac
	card_OK "$TARGET_CARD" || log_action_end_msg_and_exit "$( [ ! "$2" ] ; echo $? ; )" "none loaded"
	preinit_levels "$TARGET_CARD"
	sanify_levels "$TARGET_CARD"
	log_action_end_msg_and_exit "$?"
	;;
  *)
	echo "Usage: $MYNAME {start [CARD]|stop [CARD]|restart [CARD]|reset [CARD]}" >&2
	exit 3
	;;
esac