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 <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         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, struct snd_seq_port_subscribe *info)
  88 {
  89         struct snd_opl4 *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 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                                                       16, 24,
 169                                                       "OPL4 Wavetable Port");
 170         if (opl4->chset->port < 0) {
 171                 int err = opl4->chset->port;
 172                 snd_midi_channel_free_set(opl4->chset);
 173                 snd_seq_delete_kernel_client(client);
 174                 opl4->seq_client = -1;
 175                 return err;
 176         }
 177         return 0;
 178 }
 179
 180 static int snd_opl4_seq_delete_device(struct snd_seq_device *dev)
 181 {
 182         struct snd_opl4 *opl4;
 183
 184         opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
 185         if (!opl4)
 186                 return -EINVAL;
 187
 188         if (opl4->seq_client >= 0) {
 189                 snd_seq_delete_kernel_client(opl4->seq_client);
 190                 opl4->seq_client = -1;
 191         }
 192         return 0;
 193 }
 194
 195 static int __init alsa_opl4_synth_init(void)
 196 {
 197         static struct snd_seq_dev_ops ops = {
 198                 snd_opl4_seq_new_device,
 199                 snd_opl4_seq_delete_device
 200         };
 201
 202         return snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OPL4, &ops,
 203                                               sizeof(struct snd_opl4 *));
 204 }
 205
 206 static void __exit alsa_opl4_synth_exit(void)
 207 {
 208         snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OPL4);
 209 }
 210
 211 module_init(alsa_opl4_synth_init)
 212 module_exit(alsa_opl4_synth_exit)