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 <sound/initval.h>
38
39 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
40 MODULE_DESCRIPTION("OPL4 wavetable synth driver");
41 MODULE_LICENSE("Dual BSD/GPL");
42
43 int volume_boost = 8;
44
45 module_param(volume_boost, int, 0644);
46 MODULE_PARM_DESC(volume_boost, "Additional volume for OPL4 wavetable sounds.");
47
48 static int snd_opl4_seq_use_inc(opl4_t *opl4)
49 {
50 if (!try_module_get(opl4->card->module))
51 return -EFAULT;
52 return 0;
53 }
54
55 static void snd_opl4_seq_use_dec(opl4_t *opl4)
56 {
57 module_put(opl4->card->module);
58 }
59
60 static int snd_opl4_seq_use(void *private_data, snd_seq_port_subscribe_t *info)
61 {
62 opl4_t *opl4 = private_data;
63 int err;
64
65 down(&opl4->access_mutex);
66
67 if (opl4->used) {
68 up(&opl4->access_mutex);
69 return -EBUSY;
70 }
71 opl4->used++;
72
73 if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM) {
74 err = snd_opl4_seq_use_inc(opl4);
75 if (err < 0) {
76 up(&opl4->access_mutex);
77 return err;
78 }
79 }
80
81 up(&opl4->access_mutex);
82
83 snd_opl4_synth_reset(opl4);
84 return 0;
85 }
86
87 static int snd_opl4_seq_unuse(void *private_data, snd_seq_port_subscribe_t *info)
88 {
89 opl4_t *opl4 = private_data;
90
91 snd_opl4_synth_shutdown(opl4);
92
93 down(&opl4->access_mutex);
94 opl4->used--;
95 up(&opl4->access_mutex);
96
97 if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM)
98 snd_opl4_seq_use_dec(opl4);
99 return 0;
100 }
101
102 static snd_midi_op_t 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,
108 };
109
110 static int snd_opl4_seq_event_input(snd_seq_event_t *ev, int direct,
111 void *private_data, int atomic, int hop)
112 {
113 opl4_t *opl4 = private_data;
114
115 snd_midi_process_event(&opl4_ops, ev, opl4->chset);
116 return 0;
117 }
118
119 static void snd_opl4_seq_free_port(void *private_data)
120 {
121 opl4_t *opl4 = private_data;
122
123 snd_midi_channel_free_set(opl4->chset);
124 }
125
126 static int snd_opl4_seq_new_device(snd_seq_device_t *dev)
127 {
128 opl4_t *opl4;
129 int client;
130 snd_seq_client_callback_t callbacks;
131 snd_seq_client_info_t cinfo;
132 snd_seq_port_callback_t pcallbacks;
133
134 opl4 = *(opl4_t **)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 memset(&callbacks, 0, sizeof(callbacks));
148 callbacks.private_data = opl4;
149 callbacks.allow_output = callbacks.allow_input = 1;
150 client = snd_seq_create_kernel_client(opl4->card, opl4->seq_dev_num, &callbacks);
151 if (client < 0) {
152 snd_midi_channel_free_set(opl4->chset);
153 return client;
154 }
155 opl4->seq_client = client;
156 opl4->chset->client = client;
157
158 /* change name of client */
159 memset(&cinfo, 0, sizeof(cinfo));
160 cinfo.client = client;
161 cinfo.type = KERNEL_CLIENT;
162 strcpy(cinfo.name, "OPL4 Wavetable");
163 snd_seq_kernel_client_ctl(client, SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, &cinfo);
164
165 /* create new port */
166 memset(&pcallbacks, 0, sizeof(pcallbacks));
167 pcallbacks.owner = THIS_MODULE;
168 pcallbacks.use = snd_opl4_seq_use;
169 pcallbacks.unuse = snd_opl4_seq_unuse;
170 pcallbacks.event_input = snd_opl4_seq_event_input;
171 pcallbacks.private_free = snd_opl4_seq_free_port;
172 pcallbacks.private_data = opl4;
173
174 opl4->chset->port = snd_seq_event_port_attach(client, &pcallbacks,
175 SNDRV_SEQ_PORT_CAP_WRITE |
176 SNDRV_SEQ_PORT_CAP_SUBS_WRITE,
177 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
178 SNDRV_SEQ_PORT_TYPE_MIDI_GM,
179 16, 24,
180 "OPL4 Wavetable Port");
181 if (opl4->chset->port < 0) {
182 int err = opl4->chset->port;
183 snd_midi_channel_free_set(opl4->chset);
184 snd_seq_delete_kernel_client(client);
185 opl4->seq_client = -1;
186 return err;
187 }
188 return 0;
189 }
190
191 static int snd_opl4_seq_delete_device(snd_seq_device_t *dev)
192 {
193 opl4_t *opl4;
194
195 opl4 = *(opl4_t **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
196 if (!opl4)
197 return -EINVAL;
198
199 if (opl4->seq_client >= 0) {
200 snd_seq_delete_kernel_client(opl4->seq_client);
201 opl4->seq_client = -1;
202 }
203 return 0;
204 }
205
206 static int __init alsa_opl4_synth_init(void)
207 {
208 static snd_seq_dev_ops_t ops = {
209 snd_opl4_seq_new_device,
210 snd_opl4_seq_delete_device
211 };
212
213 return snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OPL4, &ops,
214 sizeof(opl4_t*));
215 }
216
217 static void __exit alsa_opl4_synth_exit(void)
218 {
219 snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OPL4);
220 }
221
222 module_init(alsa_opl4_synth_init)
223 module_exit(alsa_opl4_synth_exit)
224
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