root/sound/drivers/opl4/opl4_seq.c

DEFINITIONS

1. snd_opl4_seq_use_inc
2. snd_opl4_seq_use_dec
3. snd_opl4_seq_use
4. snd_opl4_seq_unuse
5. snd_opl4_seq_event_input
6. snd_opl4_seq_free_port
7. snd_opl4_seq_probe
8. snd_opl4_seq_remove

   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);