2 * OPL4 sequencer functions
4 * Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions, and the following disclaimer,
12 * without modification.
13 * 2. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
16 * Alternatively, this software may be distributed and/or modified under the
17 * terms of the GNU General Public License as published by the Free Software
18 * Foundation; either version 2 of the License, or (at your option) any later
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
25 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "opl4_local.h"
35 #include <linux/init.h>
36 #include <linux/moduleparam.h>
37 #include <sound/initval.h>
39 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
40 MODULE_DESCRIPTION("OPL4 wavetable synth driver");
41 MODULE_LICENSE("Dual BSD/GPL");
45 module_param(volume_boost, int, 0644);
46 MODULE_PARM_DESC(volume_boost, "Additional volume for OPL4 wavetable sounds.");
48 static int snd_opl4_seq_use_inc(struct snd_opl4 *opl4)
50 if (!try_module_get(opl4->card->module))
55 static void snd_opl4_seq_use_dec(struct snd_opl4 *opl4)
57 module_put(opl4->card->module);
60 static int snd_opl4_seq_use(void *private_data, struct snd_seq_port_subscribe *info)
62 struct snd_opl4 *opl4 = private_data;
65 mutex_lock(&opl4->access_mutex);
68 mutex_unlock(&opl4->access_mutex);
73 if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM) {
74 err = snd_opl4_seq_use_inc(opl4);
76 mutex_unlock(&opl4->access_mutex);
81 mutex_unlock(&opl4->access_mutex);
83 snd_opl4_synth_reset(opl4);
87 static int snd_opl4_seq_unuse(void *private_data, struct snd_seq_port_subscribe *info)
89 struct snd_opl4 *opl4 = private_data;
91 snd_opl4_synth_shutdown(opl4);
93 mutex_lock(&opl4->access_mutex);
95 mutex_unlock(&opl4->access_mutex);
97 if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM)
98 snd_opl4_seq_use_dec(opl4);
102 static struct snd_midi_op opl4_ops = {
103 .note_on = snd_opl4_note_on,
104 .note_off = snd_opl4_note_off,
105 .note_terminate = snd_opl4_terminate_note,
106 .control = snd_opl4_control,
107 .sysex = snd_opl4_sysex,
110 static int snd_opl4_seq_event_input(struct snd_seq_event *ev, int direct,
111 void *private_data, int atomic, int hop)
113 struct snd_opl4 *opl4 = private_data;
115 snd_midi_process_event(&opl4_ops, ev, opl4->chset);
119 static void snd_opl4_seq_free_port(void *private_data)
121 struct snd_opl4 *opl4 = private_data;
123 snd_midi_channel_free_set(opl4->chset);
126 static int snd_opl4_seq_new_device(struct snd_seq_device *dev)
128 struct snd_opl4 *opl4;
130 struct snd_seq_port_callback pcallbacks;
132 opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
136 if (snd_yrw801_detect(opl4) < 0)
139 opl4->chset = snd_midi_channel_alloc_set(16);
142 opl4->chset->private_data = opl4;
144 /* allocate new client */
145 client = snd_seq_create_kernel_client(opl4->card, opl4->seq_dev_num,
148 snd_midi_channel_free_set(opl4->chset);
151 opl4->seq_client = client;
152 opl4->chset->client = client;
154 /* create new port */
155 memset(&pcallbacks, 0, sizeof(pcallbacks));
156 pcallbacks.owner = THIS_MODULE;
157 pcallbacks.use = snd_opl4_seq_use;
158 pcallbacks.unuse = snd_opl4_seq_unuse;
159 pcallbacks.event_input = snd_opl4_seq_event_input;
160 pcallbacks.private_free = snd_opl4_seq_free_port;
161 pcallbacks.private_data = opl4;
163 opl4->chset->port = snd_seq_event_port_attach(client, &pcallbacks,
164 SNDRV_SEQ_PORT_CAP_WRITE |
165 SNDRV_SEQ_PORT_CAP_SUBS_WRITE,
166 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
167 SNDRV_SEQ_PORT_TYPE_MIDI_GM,
169 "OPL4 Wavetable Port");
170 if (opl4->chset->port < 0) {
171 int err = opl4->chset->port;
172 snd_midi_channel_free_set(opl4->chset);
173 snd_seq_delete_kernel_client(client);
174 opl4->seq_client = -1;
180 static int snd_opl4_seq_delete_device(struct snd_seq_device *dev)
182 struct snd_opl4 *opl4;
184 opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
188 if (opl4->seq_client >= 0) {
189 snd_seq_delete_kernel_client(opl4->seq_client);
190 opl4->seq_client = -1;
195 static int __init alsa_opl4_synth_init(void)
197 static struct snd_seq_dev_ops ops = {
198 snd_opl4_seq_new_device,
199 snd_opl4_seq_delete_device
202 return snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OPL4, &ops,
203 sizeof(struct snd_opl4 *));
206 static void __exit alsa_opl4_synth_exit(void)
208 snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OPL4);
211 module_init(alsa_opl4_synth_init)
212 module_exit(alsa_opl4_synth_exit)