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#!/bin/sh
#
# alsa-base control script
#
# Description: Used to load and unload ALSA modules and
#              restore and store mixer levels. There is no
#              longer any need to run this script on bootup
#              or shutdown. It is now moved to /usr/sbin.

set -e

# Exit if alsa-base package is not installed
[ -f /etc/modprobe.d/alsa-base.conf ] || exit 0

MYNAME=/usr/bin/alsa.sh
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

# Default values of variables in /etc/default/alsa
force_unload_modules_before_suspend=""

[ -f /etc/default/alsa ] && . /etc/default/alsa

# $* MESSAGE
warn() { echo "${MYNAME}: Warning: $* " >&2 ; }

#
# Attempt to create /var/run/alsa if it is absent.
# Return true if /var/run/alsa exists after this attempt,
# otherwise false.
#
check_run_dir()
{ 
    [ -d /var/run/alsa ] && return 0
    # We have no business creating /var/run if it doesn't exist
    if ! [ -d /var/run ] ; then
        warn "Could not create /var/run/alsa/ because /var/run/ is not present."
        return 1
    fi
    if ! mkdir --mode=755 /var/run/alsa ; then
        warn "Failed to create /var/run/alsa/."
        return 1
    fi
    [ -d /var/run/alsa ] && return 0
    return 1
}

echo_procs_using_sound()
{
    for i in /proc/[0-9]*/fd/* ; do
        var="$(readlink $i)"
        if test x"$var" != x"${var#/dev/snd/pcm}" ; then
            IFS=/; set -- $i; unset IFS; echo $3
        fi
    done
}

# $* [PID]...
echo_with_command_names()
{
    [ "$1" ] || return 0
    echo $( \
        ps --no-headers -o "%p %c" "$@" \
        | sed -e 's/\([0-9][0-9]*\) \(.*\)/\1(\2)/' \
    )
}

kill_procs_using_sound()
{
    procs_using_sound="$(echo_procs_using_sound)"
    if [ "$procs_using_sound" ] ; then
        echo -n "Terminating processes:"
        for attempt in 1 2 3 4 ; do
            echo -n " ${procs_using_sound}"
            kill $procs_using_sound || :
            sleep 1
            procs_using_sound="$(echo_procs_using_sound)"
            [ "$procs_using_sound" ] || break
        done
        # Either no more procs using sound or attempts ran out
        if [ "$procs_using_sound" ] ; then
            echo -n " (with SIGKILL:) ${procs_using_sound}"
            kill -9 $procs_using_sound || :
            sleep 1
        fi
        procs_using_sound="$(echo_procs_using_sound)"
        if [ "$procs_using_sound" ] ; then
            echo " (failed: processes still using sound devices: $(echo_with_command_names $procs_using_sound))."
            return 1
        fi
        echo "."
    fi
    return 0
}

# $* MODULE-NAME [MODULE-NAME]... | "all"
unload_modules()
{
    procs_using_sound="$(echo_procs_using_sound)"
    if [ "$procs_using_sound" ] ; then
        warn "Processes using sound devices: $(echo_with_command_names $procs_using_sound)."
    fi
    if check_run_dir ; then
        :> /var/run/alsa/modules-removed
    else
        warn "Not keeping list of removed modules because /var/run/alsa is absent.
It will not be possible automatically to reload these modules."
    fi
    echo -n "Unloading ALSA sound driver modules:"
    [ -d /proc/asound ] || { echo " (none loaded)." ; return 0 ; }
    echo_snd_modules_loaded()
    {
        lsmod \
        | sed -n -e 's/^\(snd[-_][^[:space:]]*\)[[:space:]].*/\1/p' \
        | sed -e 's/_/-/g'
    }
    for FSMBS in $* ; do
        MODULES_TO_REMOVE=""
        SND_MODULES_LOADED="$(echo_snd_modules_loaded)"
        case "$FSMBS" in
          all)
            MODULES_TO_REMOVE="$SND_MODULES_LOADED"
            ;;
          snd_*|snd-*)
            FSMBS="$(echo "$FSMBS" | sed -e 's/_/-/g')"
            for M in $SND_MODULES_LOADED ; do
                if [ "$FSMBS" = "$M" ] ; then
                    MODULES_TO_REMOVE="$FSMBS"
                    break
                fi
            done
            ;;
        esac
        [ "$MODULES_TO_REMOVE" ] || continue
        if [ -d /var/run/alsa ] ; then
            echo "$MODULES_TO_REMOVE" >> /var/run/alsa/modules-removed
        fi
        for M in $MODULES_TO_REMOVE ; do
            echo -n " ${M}"
            modprobe -r "$M" >/dev/null 2>&1 || :
        done
    done
    if [ -f /var/run/alsa/modules-removed ] ; then
        MODULES_STILL_LOADED="$(echo_snd_modules_loaded | grep -F -f /var/run/alsa/modules-removed)"
        MODULES_STILL_LOADED="$(echo $MODULES_STILL_LOADED)"
    else
        MODULES_STILL_LOADED=""
    fi
    if [ "$MODULES_STILL_LOADED" ] ; then
        echo " (failed: modules still loaded: ${MODULES_STILL_LOADED})."
        return 1
    else
        echo "."
        return 0
    fi
}

# $* MODULE-NAME [MODULE-NAME]... | "all"
force_unload_modules()
{
    kill_procs_using_sound || :
    unload_modules "$@" || return 1
    return 0
}

load_unloaded_modules()
{
    LUM_RETURNSTATUS=0
    MODULES_TO_LOAD=""
    [ -d /var/run/alsa ] || warn "Directory /var/run/alsa is absent."
    echo -n "Loading ALSA sound driver modules:"
    [ -f /var/run/alsa/modules-removed ] && MODULES_TO_LOAD="$(echo $(cat /var/run/alsa/modules-removed))"
    [ "$MODULES_TO_LOAD" ] || { echo " (none to reload)." ; return $LUM_RETURNSTATUS ; }
    echo -n " $MODULES_TO_LOAD"
    for MDL in $MODULES_TO_LOAD ; do
        modprobe $MDL || LUM_RETURNSTATUS=1
    done
    case "$LUM_RETURNSTATUS" in
      0) echo "." ;;
      *) echo " (failed)." ;;
    esac
    return $LUM_RETURNSTATUS
}

case "$1" in
  unload)
    unload_modules all || exit $?
    ;;
  reload)
    EXITSTATUS=0
    unload_modules all || EXITSTATUS=1
    load_unloaded_modules || EXITSTATUS=1
    exit $EXITSTATUS
    ;;
  force-unload)
    force_unload_modules all || exit $?
    ;;
  force-reload)
    EXITSTATUS=0
    force_unload_modules all || EXITSTATUS=1
    load_unloaded_modules || EXITSTATUS=1
    exit $EXITSTATUS
    ;;
  suspend)
    case "$force_unload_modules_before_suspend" in
      ""|false) : ;;
      all|true) force_unload_modules all || exit $? ;;
      *) force_unload_modules $force_unload_modules_before_suspend || exit $? ;;
    esac
    ;;
  resume)
    case "$force_unload_modules_before_suspend" in
      ""|false) : ;;
      *) load_unloaded_modules || exit $? ;;
    esac
    ;;
  *)
    echo "Usage: $MYNAME {unload|reload|force-unload|force-reload|suspend|resume}" >&2
    exit 3
    ;;
esac

root:/home/morfik# modprobe -r snd-ca0106
modprobe: FATAL: Module snd_ca0106 is in use.