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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 <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 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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