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opl4_seq.c
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1 /*
2  * OPL4 sequencer functions
3  *
4  * Copyright (c) 2003 by Clemens Ladisch <[email protected]>
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
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.
15  *
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
19  * version.
20  *
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
31  * SUCH DAMAGE.
32  */
33 
34 #include "opl4_local.h"
35 #include <linux/init.h>
36 #include <linux/moduleparam.h>
37 #include <linux/module.h>
38 #include <sound/initval.h>
39 
40 MODULE_AUTHOR("Clemens Ladisch <[email protected]>");
41 MODULE_DESCRIPTION("OPL4 wavetable synth driver");
42 MODULE_LICENSE("Dual BSD/GPL");
43 
44 int volume_boost = 8;
45 
46 module_param(volume_boost, int, 0644);
47 MODULE_PARM_DESC(volume_boost, "Additional volume for OPL4 wavetable sounds.");
48 
49 static int snd_opl4_seq_use_inc(struct snd_opl4 *opl4)
50 {
51  if (!try_module_get(opl4->card->module))
52  return -EFAULT;
53  return 0;
54 }
55 
56 static void snd_opl4_seq_use_dec(struct snd_opl4 *opl4)
57 {
58  module_put(opl4->card->module);
59 }
60 
61 static int snd_opl4_seq_use(void *private_data, struct snd_seq_port_subscribe *info)
62 {
63  struct snd_opl4 *opl4 = private_data;
64  int err;
65 
66  mutex_lock(&opl4->access_mutex);
67 
68  if (opl4->used) {
69  mutex_unlock(&opl4->access_mutex);
70  return -EBUSY;
71  }
72  opl4->used++;
73 
74  if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM) {
75  err = snd_opl4_seq_use_inc(opl4);
76  if (err < 0) {
77  mutex_unlock(&opl4->access_mutex);
78  return err;
79  }
80  }
81 
82  mutex_unlock(&opl4->access_mutex);
83 
85  return 0;
86 }
87 
88 static int snd_opl4_seq_unuse(void *private_data, struct snd_seq_port_subscribe *info)
89 {
90  struct snd_opl4 *opl4 = private_data;
91 
93 
94  mutex_lock(&opl4->access_mutex);
95  opl4->used--;
96  mutex_unlock(&opl4->access_mutex);
97 
98  if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM)
99  snd_opl4_seq_use_dec(opl4);
100  return 0;
101 }
102 
103 static struct snd_midi_op opl4_ops = {
104  .note_on = snd_opl4_note_on,
105  .note_off = snd_opl4_note_off,
106  .note_terminate = snd_opl4_terminate_note,
107  .control = snd_opl4_control,
108  .sysex = snd_opl4_sysex,
109 };
110 
111 static int snd_opl4_seq_event_input(struct snd_seq_event *ev, int direct,
112  void *private_data, int atomic, int hop)
113 {
114  struct snd_opl4 *opl4 = private_data;
115 
116  snd_midi_process_event(&opl4_ops, ev, opl4->chset);
117  return 0;
118 }
119 
120 static void snd_opl4_seq_free_port(void *private_data)
121 {
122  struct snd_opl4 *opl4 = private_data;
123 
124  snd_midi_channel_free_set(opl4->chset);
125 }
126 
127 static int snd_opl4_seq_new_device(struct snd_seq_device *dev)
128 {
129  struct snd_opl4 *opl4;
130  int client;
131  struct snd_seq_port_callback pcallbacks;
132 
133  opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
134  if (!opl4)
135  return -EINVAL;
136 
137  if (snd_yrw801_detect(opl4) < 0)
138  return -ENODEV;
139 
140  opl4->chset = snd_midi_channel_alloc_set(16);
141  if (!opl4->chset)
142  return -ENOMEM;
143  opl4->chset->private_data = opl4;
144 
145  /* allocate new client */
146  client = snd_seq_create_kernel_client(opl4->card, opl4->seq_dev_num,
147  "OPL4 Wavetable");
148  if (client < 0) {
149  snd_midi_channel_free_set(opl4->chset);
150  return client;
151  }
152  opl4->seq_client = client;
153  opl4->chset->client = client;
154 
155  /* create new port */
156  memset(&pcallbacks, 0, sizeof(pcallbacks));
157  pcallbacks.owner = THIS_MODULE;
158  pcallbacks.use = snd_opl4_seq_use;
159  pcallbacks.unuse = snd_opl4_seq_unuse;
160  pcallbacks.event_input = snd_opl4_seq_event_input;
161  pcallbacks.private_free = snd_opl4_seq_free_port;
162  pcallbacks.private_data = opl4;
163 
164  opl4->chset->port = snd_seq_event_port_attach(client, &pcallbacks,
171  16, 24,
172  "OPL4 Wavetable Port");
173  if (opl4->chset->port < 0) {
174  int err = opl4->chset->port;
175  snd_midi_channel_free_set(opl4->chset);
177  opl4->seq_client = -1;
178  return err;
179  }
180  return 0;
181 }
182 
183 static int snd_opl4_seq_delete_device(struct snd_seq_device *dev)
184 {
185  struct snd_opl4 *opl4;
186 
187  opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
188  if (!opl4)
189  return -EINVAL;
190 
191  if (opl4->seq_client >= 0) {
192  snd_seq_delete_kernel_client(opl4->seq_client);
193  opl4->seq_client = -1;
194  }
195  return 0;
196 }
197 
198 static int __init alsa_opl4_synth_init(void)
199 {
200  static struct snd_seq_dev_ops ops = {
201  snd_opl4_seq_new_device,
202  snd_opl4_seq_delete_device
203  };
204 
206  sizeof(struct snd_opl4 *));
207 }
208 
209 static void __exit alsa_opl4_synth_exit(void)
210 {
212 }
213 
214 module_init(alsa_opl4_synth_init)
215 module_exit(alsa_opl4_synth_exit)