1/*
2 *  Mixer Interface - simple abstact module - base library (dlopen function)
3 *  Copyright (c) 2005 by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 *   This library is free software; you can redistribute it and/or modify
7 *   it under the terms of the GNU Lesser General Public License as
8 *   published by the Free Software Foundation; either version 2.1 of
9 *   the License, or (at your option) any later version.
10 *
11 *   This program is distributed in the hope that it will be useful,
12 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
13 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 *   GNU Lesser General Public License for more details.
15 *
16 *   You should have received a copy of the GNU Lesser General Public
17 *   License along with this library; if not, write to the Free Software
18 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19 *
20 */
21
22
23#include <stdio.h>
24#include <stdlib.h>
25#include <unistd.h>
26#include <string.h>
27#include <fcntl.h>
28#include <sys/ioctl.h>
29#include <math.h>
30#include <dlfcn.h>
31#include "config.h"
32#include "asoundlib.h"
33#include "mixer_abst.h"
34#include "sbase.h"
35
36#define SO_PATH ALSA_PLUGIN_DIR "/smixer"
37
38int mixer_simple_basic_dlopen(snd_mixer_class_t *class,
39			      bclass_base_ops_t **ops)
40{
41	struct bclass_private *priv = snd_mixer_sbasic_get_private(class);
42	const char *lib = "smixer-sbase.so";
43	void (*initpriv)(snd_mixer_class_t *class, struct bclass_private *priv);
44	char *xlib, *path;
45	void *h;
46	int initflag = 0;
47
48	if (priv == NULL) {
49		priv = calloc(1, sizeof(*priv));
50		if (priv == NULL)
51			return -ENOMEM;
52		initflag = 1;
53	}
54	path = getenv("ALSA_MIXER_SIMPLE_MODULES");
55	if (!path)
56		path = SO_PATH;
57	xlib = malloc(strlen(lib) + strlen(path) + 1 + 1);
58	if (xlib == NULL) {
59		if (initflag)
60			free(priv);
61		return -ENOMEM;
62	}
63	strcpy(xlib, path);
64	strcat(xlib, "/");
65	strcat(xlib, lib);
66	h = snd_dlopen(xlib, RTLD_NOW);
67	if (h == NULL) {
68		SNDERR("Unable to open library '%s'", xlib);
69		goto __error;
70	}
71	initpriv = dlsym(h, "alsa_mixer_sbasic_initpriv");
72	if (initpriv == NULL) {
73		SNDERR("Symbol 'alsa_mixer_sbasic_initpriv' was not found in '%s'", xlib);
74		goto __error;
75	}
76	priv->ops.event = dlsym(h, "alsa_mixer_sbasic_event");
77	if (priv->ops.event == NULL) {
78		SNDERR("Symbol 'alsa_mixer_sbasic_event' was not found in '%s'", xlib);
79		goto __error;
80	}
81	priv->ops.selreg = dlsym(h, "alsa_mixer_sbasic_selreg");
82	if (priv->ops.selreg == NULL) {
83		SNDERR("Symbol 'alsa_mixer_sbasic_selreg' was not found in '%s'", xlib);
84		goto __error;
85	}
86	priv->ops.sidreg = dlsym(h, "alsa_mixer_sbasic_sidreg");
87	if (priv->ops.sidreg == NULL) {
88		SNDERR("Symbol 'alsa_mixer_sbasic_sidreg' was not found in '%s'", xlib);
89		goto __error;
90	}
91	free(xlib);
92	if (initflag)
93		initpriv(class, priv);
94	priv->dl_sbase = h;
95	if (ops)
96		*ops = &priv->ops;
97	return 1;
98
99      __error:
100      	if (initflag)
101      		free(priv);
102	if (h)
103		snd_dlclose(h);
104	free(xlib);
105	return -ENXIO;
106}
107