1 /*
2 * OPL4 sequencer functions
3 *
4 * Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
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 <clemens@ladisch.de>");
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
84 snd_opl4_synth_reset(opl4);
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
92 snd_opl4_synth_shutdown(opl4);
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 const 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_probe(struct device *_dev)
128 {
129 struct snd_seq_device *dev = to_seq_dev(_dev);
130 struct snd_opl4 *opl4;
131 int client;
132 struct snd_seq_port_callback pcallbacks;
133
134 opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
135 if (!opl4)
136 return -EINVAL;
137
138 if (snd_yrw801_detect(opl4) < 0)
139 return -ENODEV;
140
141 opl4->chset = snd_midi_channel_alloc_set(16);
142 if (!opl4->chset)
143 return -ENOMEM;
144 opl4->chset->private_data = opl4;
145
146 /* allocate new client */
147 client = snd_seq_create_kernel_client(opl4->card, opl4->seq_dev_num,
148 "OPL4 Wavetable");
149 if (client < 0) {
150 snd_midi_channel_free_set(opl4->chset);
151 return client;
152 }
153 opl4->seq_client = client;
154 opl4->chset->client = client;
155
156 /* create new port */
157 memset(&pcallbacks, 0, sizeof(pcallbacks));
158 pcallbacks.owner = THIS_MODULE;
159 pcallbacks.use = snd_opl4_seq_use;
160 pcallbacks.unuse = snd_opl4_seq_unuse;
161 pcallbacks.event_input = snd_opl4_seq_event_input;
162 pcallbacks.private_free = snd_opl4_seq_free_port;
163 pcallbacks.private_data = opl4;
164
165 opl4->chset->port = snd_seq_event_port_attach(client, &pcallbacks,
166 SNDRV_SEQ_PORT_CAP_WRITE |
167 SNDRV_SEQ_PORT_CAP_SUBS_WRITE,
168 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
169 SNDRV_SEQ_PORT_TYPE_MIDI_GM |
170 SNDRV_SEQ_PORT_TYPE_HARDWARE |
171 SNDRV_SEQ_PORT_TYPE_SYNTHESIZER,
172 16, 24,
173 "OPL4 Wavetable Port");
174 if (opl4->chset->port < 0) {
175 int err = opl4->chset->port;
176 snd_midi_channel_free_set(opl4->chset);
177 snd_seq_delete_kernel_client(client);
178 opl4->seq_client = -1;
179 return err;
180 }
181 return 0;
182 }
183
184 static int snd_opl4_seq_remove(struct device *_dev)
185 {
186 struct snd_seq_device *dev = to_seq_dev(_dev);
187 struct snd_opl4 *opl4;
188
189 opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
190 if (!opl4)
191 return -EINVAL;
192
193 if (opl4->seq_client >= 0) {
194 snd_seq_delete_kernel_client(opl4->seq_client);
195 opl4->seq_client = -1;
196 }
197 return 0;
198 }
199
200 static struct snd_seq_driver opl4_seq_driver = {
201 .driver = {
202 .name = KBUILD_MODNAME,
203 .probe = snd_opl4_seq_probe,
204 .remove = snd_opl4_seq_remove,
205 },
206 .id = SNDRV_SEQ_DEV_ID_OPL4,
207 .argsize = sizeof(struct snd_opl4 *),
208 };
209
210 module_snd_seq_driver(opl4_seq_driver);
211
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