initial & empty smixer-ac97.so module (only the build framework)

configure.in

@@ -202,7 +202,7 @@ fi
 
 AC_OUTPUT(Makefile doc/Makefile doc/pictures/Makefile include/Makefile
 	  include/sound/Makefile src/Makefile \
-          src/control/Makefile src/mixer/Makefile \
+          src/control/Makefile src/mixer/Makefile src/mixer/simple/Makefile \
 	  src/pcm/Makefile src/pcm/scopes/Makefile \
 	  src/rawmidi/Makefile src/timer/Makefile \
           src/hwdep/Makefile src/seq/Makefile src/instr/Makefile \

doc/asoundrc.txt

@@ -452,7 +452,7 @@ pcm.m {
 }
 
 pcm_scope_type.level {
-	lib /home/abramo/scopes/liblevel.so
+	lib /home/abramo/scopes/scope-level.so
 } 
 
 # an example command is 'aplay -D plug:ladspa <filename>'

src/conf/smixer.conf

@@ -1,8 +1,8 @@
 usb {
 	searchl "USB"
-	lib smixer_usb.so
+	lib smixer-usb.so
 }
 ac97 {
 	searchl "AC97a:"
-	lib smixer_ac97.so
+	lib smixer-ac97.so
 }

src/mixer/Makefile.am

@@ -1,3 +1,5 @@
+SUBDIRS=simple
+
 EXTRA_LTLIBRARIES=libmixer.la
 
 libmixer_la_SOURCES = bag.c mixer.c simple.c simple_none.c simple_abst.c

src/mixer/simple/Makefile.am

@@ -0,0 +1,8 @@
+pkglibdir = $(libdir)/@PACKAGE@/smixer
+
+AM_CFLAGS = -g -O2 -W -Wall
+
+pkglib_LTLIBRARIES = smixer-ac97.la
+
+smixer_ac97_la_SOURCES = ac97.c
+smixer_ac97_la_LDFLAGS = -module

src/mixer/simple/ac97.c

@@ -0,0 +1,36 @@
+/*
+ *  Mixer Interface - AC97 simple abstact module
+ *  Copyright (c) 2005 by Jaroslav Kysela <perex@suse.cz>
+ *
+ *
+ *   This library is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU Lesser General Public License as
+ *   published by the Free Software Foundation; either version 2.1 of
+ *   the License, or (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU Lesser General Public License for more details.
+ *
+ *   You should have received a copy of the GNU Lesser General Public
+ *   License along with this library; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <math.h>
+#include <alsa/asoundlib.h>
+
+int alsa_mixer_simple_event(snd_mixer_class_t *class, unsigned int mask,
+			    snd_hctl_elem_t *helem, snd_mixer_elem_t *melem)
+{
+	return -EIO;
+}
+                                 

src/mixer/simple_abst.c

@@ -39,27 +39,33 @@
 #include "asoundlib.h"
 #include "mixer_simple.h"
 
-#define SO_PATH PKGLIBDIR "/smixer/"
+#define SO_PATH PKGLIBDIR "/smixer"
 
 typedef struct _class_priv {
 	char *device;
 	snd_ctl_t *ctl;
 	snd_hctl_t *hctl;
 	snd_ctl_card_info_t *info;
-} class_priv_t;   
+	void *dlhandle;
+} class_priv_t;
 
 static int try_open(snd_mixer_class_t *class, const char *lib)
 {
+	class_priv_t *priv = snd_mixer_class_get_private(class);
 	snd_mixer_event_t event_func;
-	char *xlib;
+	char *xlib, *path;
 	void *h;
 
-	xlib = malloc(strlen(lib) + strlen(SO_PATH) + 1);
+	path = getenv("ALSA_MIXER_SIMPLE_MODULES");
+	if (!path)
+		path = SO_PATH;
+	xlib = malloc(strlen(lib) + strlen(path) + 1 + 1);
 	if (xlib == NULL)
 		return -ENOMEM;
-	strcpy(xlib, SO_PATH);
+	strcpy(xlib, path);
+	strcat(xlib, "/");
 	strcat(xlib, lib);
-	h = snd_dlopen(lib, RTLD_NOW);
+	h = snd_dlopen(xlib, RTLD_NOW);
 	if (h == NULL) {
 		SNDERR("Unable to open library '%s'", xlib);
 		free(xlib);
@@ -74,6 +80,7 @@ static int try_open(snd_mixer_class_t *class, const char *lib)
 	}
 	free(xlib);
 	snd_mixer_class_set_event(class, event_func);
+	priv->dlhandle = h;
 	return 0;
 }
 
@@ -140,6 +147,8 @@ static void private_free(snd_mixer_class_t *class)
 {
 	class_priv_t *priv = snd_mixer_class_get_private(class);
 	
+	if (priv->dlhandle)
+		snd_dlclose(priv->dlhandle);
 	if (priv->info)
 		snd_ctl_card_info_free(priv->info);
 	if (priv->hctl)