LXR linux/sound/drivers/opl4/opl4

   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
  39MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
  40MODULE_DESCRIPTION("OPL4 wavetable synth driver");
  41MODULE_LICENSE("Dual BSD/GPL");
  42
  43int volume_boost = 8;
  44
  45module_param(volume_boost, int, 0644);
  46MODULE_PARM_DESC(volume_boost, "Additional volume for OPL4 wavetable sounds.");
  47
  48static 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
  55static void snd_opl4_seq_use_dec(struct snd_opl4 *opl4)
  56{
  57        module_put(opl4->card->module);
  58}
  59
  60static 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        mutex_lock(&opl4->access_mutex);
  66
  67        if (opl4->used) {
  68                mutex_unlock(&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                        mutex_unlock(&opl4->access_mutex);
  77                        return err;
  78                }
  79        }
  80
  81        mutex_unlock(&opl4->access_mutex);
  82
  83        snd_opl4_synth_reset(opl4);
  84        return 0;
  85}
  86
  87static 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        mutex_lock(&opl4->access_mutex);
  94        opl4->used--;
  95        mutex_unlock(&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
 102static 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
 110static 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
 119static 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
 126static 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                                                      SNDRV_SEQ_PORT_TYPE_HARDWARE |
 169                                                      SNDRV_SEQ_PORT_TYPE_SYNTHESIZER,
 170                                                      16, 24,
 171                                                      "OPL4 Wavetable Port");
 172        if (opl4->chset->port < 0) {
 173                int err = opl4->chset->port;
 174                snd_midi_channel_free_set(opl4->chset);
 175                snd_seq_delete_kernel_client(client);
 176                opl4->seq_client = -1;
 177                return err;
 178        }
 179        return 0;
 180}
 181
 182static int snd_opl4_seq_delete_device(struct snd_seq_device *dev)
 183{
 184        struct snd_opl4 *opl4;
 185
 186        opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
 187        if (!opl4)
 188                return -EINVAL;
 189
 190        if (opl4->seq_client >= 0) {
 191                snd_seq_delete_kernel_client(opl4->seq_client);
 192                opl4->seq_client = -1;
 193        }
 194        return 0;
 195}
 196
 197static int __init alsa_opl4_synth_init(void)
 198{
 199        static struct snd_seq_dev_ops ops = {
 200                snd_opl4_seq_new_device,
 201                snd_opl4_seq_delete_device
 202        };
 203
 204        return snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OPL4, &ops,
 205                                              sizeof(struct snd_opl4 *));
 206}
 207
 208static void __exit alsa_opl4_synth_exit(void)
 209{
 210        snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OPL4);
 211}
 212
 213module_init(alsa_opl4_synth_init)
 214module_exit(alsa_opl4_synth_exit)
 215