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(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)