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Linux/sound/drivers/opl4/opl4_seq.c

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  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(struct snd_opl4 *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(struct snd_opl4 *opl4)
 56 {
 57         module_put(opl4->card->module);
 58 }
 59 
 60 static int snd_opl4_seq_use(void *private_data, struct snd_seq_port_subscribe *info)
 61 {
 62         struct snd_opl4 *opl4 = private_data;
 63         int err;
 64 
 65         mutex_lock(&opl4->access_mutex);
 66 
 67         if (opl4->used) {
 68                 mutex_unlock(&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                         mutex_unlock(&opl4->access_mutex);
 77                         return err;
 78                 }
 79         }
 80 
 81         mutex_unlock(&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, struct snd_seq_port_subscribe *info)
 88 {
 89         struct snd_opl4 *opl4 = private_data;
 90 
 91         snd_opl4_synth_shutdown(opl4);
 92 
 93         mutex_lock(&opl4->access_mutex);
 94         opl4->used--;
 95         mutex_unlock(&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 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,
108 };
109 
110 static int snd_opl4_seq_event_input(struct snd_seq_event *ev, int direct,
111                                     void *private_data, int atomic, int hop)
112 {
113         struct snd_opl4 *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         struct snd_opl4 *opl4 = private_data;
122 
123         snd_midi_channel_free_set(opl4->chset);
124 }
125 
126 static int snd_opl4_seq_new_device(struct snd_seq_device *dev)
127 {
128         struct snd_opl4 *opl4;
129         int client;
130         struct snd_seq_port_callback pcallbacks;
131 
132         opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
133         if (!opl4)
134                 return -EINVAL;
135 
136         if (snd_yrw801_detect(opl4) < 0)
137                 return -ENODEV;
138 
139         opl4->chset = snd_midi_channel_alloc_set(16);
140         if (!opl4->chset)
141                 return -ENOMEM;
142         opl4->chset->private_data = opl4;
143 
144         /* allocate new client */
145         client = snd_seq_create_kernel_client(opl4->card, opl4->seq_dev_num,
146                                               "OPL4 Wavetable");
147         if (client < 0) {
148                 snd_midi_channel_free_set(opl4->chset);
149                 return client;
150         }
151         opl4->seq_client = client;
152         opl4->chset->client = client;
153 
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;
162 
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 |
168                                                       SNDRV_SEQ_PORT_TYPE_HARDWARE |
169                                                       SNDRV_SEQ_PORT_TYPE_SYNTHESIZER,
170                                                       16, 24,
171                                                       "OPL4 Wavetable Port");
172         if (opl4->chset->port < 0) {
173                 int err = opl4->chset->port;
174                 snd_midi_channel_free_set(opl4->chset);
175                 snd_seq_delete_kernel_client(client);
176                 opl4->seq_client = -1;
177                 return err;
178         }
179         return 0;
180 }
181 
182 static int snd_opl4_seq_delete_device(struct snd_seq_device *dev)
183 {
184         struct snd_opl4 *opl4;
185 
186         opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
187         if (!opl4)
188                 return -EINVAL;
189 
190         if (opl4->seq_client >= 0) {
191                 snd_seq_delete_kernel_client(opl4->seq_client);
192                 opl4->seq_client = -1;
193         }
194         return 0;
195 }
196 
197 static int __init alsa_opl4_synth_init(void)
198 {
199         static struct snd_seq_dev_ops ops = {
200                 snd_opl4_seq_new_device,
201                 snd_opl4_seq_delete_device
202         };
203 
204         return snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OPL4, &ops,
205                                               sizeof(struct snd_opl4 *));
206 }
207 
208 static void __exit alsa_opl4_synth_exit(void)
209 {
210         snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OPL4);
211 }
212 
213 module_init(alsa_opl4_synth_init)
214 module_exit(alsa_opl4_synth_exit)
215 

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