Add a mixer script that saves the current settings of all mixers present

in the system on shutdown and restores the settings on boot.  The settings
can also be reset to the saved values via 'mixer reload'.

Reviewed by:	current@

etc/rc.d/Makefile

@@ -19,7 +19,7 @@ FILES=	DAEMON LOGIN NETWORKING SERVERS \
 	jail \
 	kadmind kerberos keyserv kldxref kpasswdd \
 	ldconfig local localpkg lomac lpd \
-	motd mountcritlocal mountcritremote \
+	mixer motd mountcritlocal mountcritremote \
 	mountd moused mroute6d mrouted msgs \
 	named netif netoptions \
 	network_ipv6 nfsclient nfsd \

etc/rc.d/mixer

@@ -0,0 +1,112 @@
+#!/bin/sh -
+#
+# Copyright (c) 2004  The FreeBSD Project
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+# $FreeBSD$
+#
+
+# PROVIDE: mixer
+# REQUIRE: LOGIN usbd
+# KEYWORD: FreeBSD
+
+. /etc/rc.subr
+
+name="mixer"
+stop_cmd="mixer_stop"
+start_cmd="mixer_start"
+reload_cmd="mixer_start"
+extra_commands="reload"
+
+#
+# List current mixer devices to stdout.
+#
+list_mixers()
+{
+
+	( cd /dev ; ls mixer* 2>/dev/null )
+}
+
+#
+# Echo state file name for an individual mixer ($1) to stdout
+#
+mixer_statefile()
+{
+	echo "/var/db/${1}-state"
+}
+
+#
+# Save state of an individual mixer specified as $1
+#
+mixer_save()
+{
+	local file dev
+
+	dev="/dev/${1}"
+	file=`mixer_statefile $1`
+	if [ -r ${dev} ]; then
+		/usr/sbin/mixer -f ${dev} -s > ${file} 2>/dev/null
+	fi
+}
+
+#
+# Restore the state of an individual mixer specified as $1
+#
+mixer_restore()
+{
+	local file dev
+
+	dev="/dev/${1}"
+	file=`mixer_statefile $1`
+	if [ -r ${dev} -a -r ${file} ]; then
+		/usr/sbin/mixer -f ${dev} `cat ${file}` > /dev/null
+	fi
+}
+
+#
+# Restore state of all mixers
+#
+mixer_start()
+{
+	local mixer
+
+	for mixer in `list_mixers`; do
+		mixer_restore ${mixer}
+	done
+}
+
+#
+# Save the state of all mixers
+#
+mixer_stop()
+{
+	local mixer
+
+	for mixer in `list_mixers`; do
+		mixer_save ${mixer}
+	done
+}
+
+load_rc_config $name
+run_rc_command "$1"