sound/drivers/opl4/opl4_seq.c

   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_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,
 165                                                       SNDRV_SEQ_PORT_CAP_WRITE |
 166                                                       SNDRV_SEQ_PORT_CAP_SUBS_WRITE,
 167                                                       SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
 168                                                       SNDRV_SEQ_PORT_TYPE_MIDI_GM |
 169                                                       SNDRV_SEQ_PORT_TYPE_HARDWARE |
 170                                                       SNDRV_SEQ_PORT_TYPE_SYNTHESIZER,
 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);
 176                 snd_seq_delete_kernel_client(client);
 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
 205         return snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OPL4, &ops,
 206                                               sizeof(struct snd_opl4 *));
 207 }
 208
 209 static void __exit alsa_opl4_synth_exit(void)
 210 {
 211         snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OPL4);
 212 }
 213
 214 module_init(alsa_opl4_synth_init)
 215 module_exit(alsa_opl4_synth_exit)