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 <sound/initval.h>
  37
  38 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
  39 MODULE_DESCRIPTION("OPL4 wavetable synth driver");
  40 MODULE_LICENSE("Dual BSD/GPL");
  41 MODULE_CLASSES("{sound}");
  42
  43 int volume_boost = 8;
  44
  45 MODULE_PARM(volume_boost, "i");
  46 MODULE_PARM_DESC(volume_boost, "Additional volume for OPL4 wavetable sounds.");
  47 MODULE_PARM_SYNTAX(volume_boost, "default:8");
  48
  49 static int snd_opl4_seq_use_inc(opl4_t *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(opl4_t *opl4)
  57 {
  58         module_put(opl4->card->module);
  59 }
  60
  61 static int snd_opl4_seq_use(void *private_data, snd_seq_port_subscribe_t *info)
  62 {
  63         opl4_t *opl4 = snd_magic_cast(opl4_t, private_data, return -ENXIO);
  64         int err;
  65
  66         down(&opl4->access_mutex);
  67
  68         if (opl4->used) {
  69                 up(&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                         up(&opl4->access_mutex);
  78                         return err;
  79                 }
  80         }
  81
  82         up(&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, snd_seq_port_subscribe_t *info)
  89 {
  90         opl4_t *opl4 = snd_magic_cast(opl4_t, private_data, return -ENXIO);
  91
  92         snd_opl4_synth_shutdown(opl4);
  93
  94         down(&opl4->access_mutex);
  95         opl4->used--;
  96         up(&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 snd_midi_op_t 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(snd_seq_event_t *ev, int direct,
 112                                     void *private_data, int atomic, int hop)
 113 {
 114         opl4_t *opl4 = snd_magic_cast(opl4_t, private_data, return -ENXIO);
 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         opl4_t *opl4 = snd_magic_cast(opl4_t, private_data, return);
 123
 124         snd_midi_channel_free_set(opl4->chset);
 125 }
 126
 127 static int snd_opl4_seq_new_device(snd_seq_device_t *dev)
 128 {
 129         opl4_t *opl4;
 130         int client;
 131         snd_seq_client_callback_t callbacks;
 132         snd_seq_client_info_t cinfo;
 133         snd_seq_port_callback_t pcallbacks;
 134
 135         opl4 = *(opl4_t **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
 136         if (!opl4)
 137                 return -EINVAL;
 138
 139         if (snd_yrw801_detect(opl4) < 0)
 140                 return -ENODEV;
 141
 142         opl4->chset = snd_midi_channel_alloc_set(16);
 143         if (!opl4->chset)
 144                 return -ENOMEM;
 145         opl4->chset->private_data = opl4;
 146
 147         /* allocate new client */
 148         memset(&callbacks, 0, sizeof(callbacks));
 149         callbacks.private_data = opl4;
 150         callbacks.allow_output = callbacks.allow_input = 1;
 151         client = snd_seq_create_kernel_client(opl4->card, opl4->seq_dev_num, &callbacks);
 152         if (client < 0) {
 153                 snd_midi_channel_free_set(opl4->chset);
 154                 return client;
 155         }
 156         opl4->seq_client = client;
 157         opl4->chset->client = client;
 158
 159         /* change name of client */
 160         memset(&cinfo, 0, sizeof(cinfo));
 161         cinfo.client = client;
 162         cinfo.type = KERNEL_CLIENT;
 163         strcpy(cinfo.name, "OPL4 Wavetable");
 164         snd_seq_kernel_client_ctl(client, SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, &cinfo);
 165
 166         /* create new port */
 167         memset(&pcallbacks, 0, sizeof(pcallbacks));
 168         pcallbacks.owner = THIS_MODULE;
 169         pcallbacks.use = snd_opl4_seq_use;
 170         pcallbacks.unuse = snd_opl4_seq_unuse;
 171         pcallbacks.event_input = snd_opl4_seq_event_input;
 172         pcallbacks.private_free = snd_opl4_seq_free_port;
 173         pcallbacks.private_data = opl4;
 174
 175         opl4->chset->port = snd_seq_event_port_attach(client, &pcallbacks,
 176                                                       SNDRV_SEQ_PORT_CAP_WRITE |
 177                                                       SNDRV_SEQ_PORT_CAP_SUBS_WRITE,
 178                                                       SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
 179                                                       SNDRV_SEQ_PORT_TYPE_MIDI_GM,
 180                                                       16, 24,
 181                                                       "OPL4 Wavetable Port");
 182         if (opl4->chset->port < 0) {
 183                 int err = opl4->chset->port;
 184                 snd_midi_channel_free_set(opl4->chset);
 185                 snd_seq_delete_kernel_client(client);
 186                 opl4->seq_client = -1;
 187                 return err;
 188         }
 189         return 0;
 190 }
 191
 192 static int snd_opl4_seq_delete_device(snd_seq_device_t *dev)
 193 {
 194         opl4_t *opl4;
 195
 196         opl4 = *(opl4_t **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
 197         if (!opl4)
 198                 return -EINVAL;
 199
 200         if (opl4->seq_client >= 0) {
 201                 snd_seq_delete_kernel_client(opl4->seq_client);
 202                 opl4->seq_client = -1;
 203         }
 204         return 0;
 205 }
 206
 207 static int __init alsa_opl4_synth_init(void)
 208 {
 209         static snd_seq_dev_ops_t ops = {
 210                 snd_opl4_seq_new_device,
 211                 snd_opl4_seq_delete_device
 212         };
 213
 214         return snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OPL4, &ops,
 215                                               sizeof(opl4_t*));
 216 }
 217
 218 static void __exit alsa_opl4_synth_exit(void)
 219 {
 220         snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OPL4);
 221 }
 222
 223 module_init(alsa_opl4_synth_init)
 224 module_exit(alsa_opl4_synth_exit)