linux/sound/drivers/opl3/opl3_seq.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  Copyright (c) by Uros Bizjak <uros@kss-loka.si>
   4 *
   5 *  Midi Sequencer interface routines for OPL2/OPL3/OPL4 FM
   6 *
   7 *  OPL2/3 FM instrument loader:
   8 *   alsa-tools/seq/sbiload/
   9 */
  10
  11#include "opl3_voice.h"
  12#include <linux/init.h>
  13#include <linux/moduleparam.h>
  14#include <linux/module.h>
  15#include <sound/initval.h>
  16
  17MODULE_AUTHOR("Uros Bizjak <uros@kss-loka.si>");
  18MODULE_LICENSE("GPL");
  19MODULE_DESCRIPTION("ALSA driver for OPL3 FM synth");
  20
  21bool use_internal_drums = 0;
  22module_param(use_internal_drums, bool, 0444);
  23MODULE_PARM_DESC(use_internal_drums, "Enable internal OPL2/3 drums.");
  24
  25int snd_opl3_synth_use_inc(struct snd_opl3 * opl3)
  26{
  27        if (!try_module_get(opl3->card->module))
  28                return -EFAULT;
  29        return 0;
  30
  31}
  32
  33void snd_opl3_synth_use_dec(struct snd_opl3 * opl3)
  34{
  35        module_put(opl3->card->module);
  36}
  37
  38int snd_opl3_synth_setup(struct snd_opl3 * opl3)
  39{
  40        int idx;
  41        struct snd_hwdep *hwdep = opl3->hwdep;
  42
  43        mutex_lock(&hwdep->open_mutex);
  44        if (hwdep->used) {
  45                mutex_unlock(&hwdep->open_mutex);
  46                return -EBUSY;
  47        }
  48        hwdep->used++;
  49        mutex_unlock(&hwdep->open_mutex);
  50
  51        snd_opl3_reset(opl3);
  52
  53        for (idx = 0; idx < MAX_OPL3_VOICES; idx++) {
  54                opl3->voices[idx].state = SNDRV_OPL3_ST_OFF;
  55                opl3->voices[idx].time = 0;
  56                opl3->voices[idx].keyon_reg = 0x00;
  57        }
  58        opl3->use_time = 0;
  59        opl3->connection_reg = 0x00;
  60        if (opl3->hardware >= OPL3_HW_OPL3) {
  61                /* Clear 4-op connections */
  62                opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT,
  63                                 opl3->connection_reg);
  64                opl3->max_voices = MAX_OPL3_VOICES;
  65        }
  66        return 0;
  67}
  68
  69void snd_opl3_synth_cleanup(struct snd_opl3 * opl3)
  70{
  71        unsigned long flags;
  72        struct snd_hwdep *hwdep;
  73
  74        /* Stop system timer */
  75        spin_lock_irqsave(&opl3->sys_timer_lock, flags);
  76        if (opl3->sys_timer_status) {
  77                del_timer(&opl3->tlist);
  78                opl3->sys_timer_status = 0;
  79        }
  80        spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
  81
  82        snd_opl3_reset(opl3);
  83        hwdep = opl3->hwdep;
  84        mutex_lock(&hwdep->open_mutex);
  85        hwdep->used--;
  86        mutex_unlock(&hwdep->open_mutex);
  87        wake_up(&hwdep->open_wait);
  88}
  89
  90static int snd_opl3_synth_use(void *private_data, struct snd_seq_port_subscribe * info)
  91{
  92        struct snd_opl3 *opl3 = private_data;
  93        int err;
  94
  95        if ((err = snd_opl3_synth_setup(opl3)) < 0)
  96                return err;
  97
  98        if (use_internal_drums) {
  99                /* Percussion mode */
 100                opl3->voices[6].state = opl3->voices[7].state = 
 101                        opl3->voices[8].state = SNDRV_OPL3_ST_NOT_AVAIL;
 102                snd_opl3_load_drums(opl3);
 103                opl3->drum_reg = OPL3_PERCUSSION_ENABLE;
 104                opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, opl3->drum_reg);
 105        } else {
 106                opl3->drum_reg = 0x00;
 107        }
 108
 109        if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM) {
 110                if ((err = snd_opl3_synth_use_inc(opl3)) < 0)
 111                        return err;
 112        }
 113        opl3->synth_mode = SNDRV_OPL3_MODE_SEQ;
 114        return 0;
 115}
 116
 117static int snd_opl3_synth_unuse(void *private_data, struct snd_seq_port_subscribe * info)
 118{
 119        struct snd_opl3 *opl3 = private_data;
 120
 121        snd_opl3_synth_cleanup(opl3);
 122
 123        if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM)
 124                snd_opl3_synth_use_dec(opl3);
 125        return 0;
 126}
 127
 128/*
 129 * MIDI emulation operators
 130 */
 131const struct snd_midi_op opl3_ops = {
 132        .note_on =              snd_opl3_note_on,
 133        .note_off =             snd_opl3_note_off,
 134        .key_press =            snd_opl3_key_press,
 135        .note_terminate =       snd_opl3_terminate_note,
 136        .control =              snd_opl3_control,
 137        .nrpn =                 snd_opl3_nrpn,
 138        .sysex =                snd_opl3_sysex,
 139};
 140
 141static int snd_opl3_synth_event_input(struct snd_seq_event * ev, int direct,
 142                                      void *private_data, int atomic, int hop)
 143{
 144        struct snd_opl3 *opl3 = private_data;
 145
 146        snd_midi_process_event(&opl3_ops, ev, opl3->chset);
 147        return 0;
 148}
 149
 150/* ------------------------------ */
 151
 152static void snd_opl3_synth_free_port(void *private_data)
 153{
 154        struct snd_opl3 *opl3 = private_data;
 155
 156        snd_midi_channel_free_set(opl3->chset);
 157}
 158
 159static int snd_opl3_synth_create_port(struct snd_opl3 * opl3)
 160{
 161        struct snd_seq_port_callback callbacks;
 162        char name[32];
 163        int voices, opl_ver;
 164
 165        voices = (opl3->hardware < OPL3_HW_OPL3) ?
 166                MAX_OPL2_VOICES : MAX_OPL3_VOICES;
 167        opl3->chset = snd_midi_channel_alloc_set(16);
 168        if (opl3->chset == NULL)
 169                return -ENOMEM;
 170        opl3->chset->private_data = opl3;
 171
 172        memset(&callbacks, 0, sizeof(callbacks));
 173        callbacks.owner = THIS_MODULE;
 174        callbacks.use = snd_opl3_synth_use;
 175        callbacks.unuse = snd_opl3_synth_unuse;
 176        callbacks.event_input = snd_opl3_synth_event_input;
 177        callbacks.private_free = snd_opl3_synth_free_port;
 178        callbacks.private_data = opl3;
 179
 180        opl_ver = (opl3->hardware & OPL3_HW_MASK) >> 8;
 181        sprintf(name, "OPL%i FM Port", opl_ver);
 182
 183        opl3->chset->client = opl3->seq_client;
 184        opl3->chset->port = snd_seq_event_port_attach(opl3->seq_client, &callbacks,
 185                                                      SNDRV_SEQ_PORT_CAP_WRITE |
 186                                                      SNDRV_SEQ_PORT_CAP_SUBS_WRITE,
 187                                                      SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
 188                                                      SNDRV_SEQ_PORT_TYPE_MIDI_GM |
 189                                                      SNDRV_SEQ_PORT_TYPE_DIRECT_SAMPLE |
 190                                                      SNDRV_SEQ_PORT_TYPE_HARDWARE |
 191                                                      SNDRV_SEQ_PORT_TYPE_SYNTHESIZER,
 192                                                      16, voices,
 193                                                      name);
 194        if (opl3->chset->port < 0) {
 195                int port;
 196                port = opl3->chset->port;
 197                snd_midi_channel_free_set(opl3->chset);
 198                return port;
 199        }
 200        return 0;
 201}
 202
 203/* ------------------------------ */
 204
 205static int snd_opl3_seq_probe(struct device *_dev)
 206{
 207        struct snd_seq_device *dev = to_seq_dev(_dev);
 208        struct snd_opl3 *opl3;
 209        int client, err;
 210        char name[32];
 211        int opl_ver;
 212
 213        opl3 = *(struct snd_opl3 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
 214        if (opl3 == NULL)
 215                return -EINVAL;
 216
 217        spin_lock_init(&opl3->voice_lock);
 218
 219        opl3->seq_client = -1;
 220
 221        /* allocate new client */
 222        opl_ver = (opl3->hardware & OPL3_HW_MASK) >> 8;
 223        sprintf(name, "OPL%i FM synth", opl_ver);
 224        client = opl3->seq_client =
 225                snd_seq_create_kernel_client(opl3->card, opl3->seq_dev_num,
 226                                             name);
 227        if (client < 0)
 228                return client;
 229
 230        if ((err = snd_opl3_synth_create_port(opl3)) < 0) {
 231                snd_seq_delete_kernel_client(client);
 232                opl3->seq_client = -1;
 233                return err;
 234        }
 235
 236        /* setup system timer */
 237        timer_setup(&opl3->tlist, snd_opl3_timer_func, 0);
 238        spin_lock_init(&opl3->sys_timer_lock);
 239        opl3->sys_timer_status = 0;
 240
 241#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
 242        snd_opl3_init_seq_oss(opl3, name);
 243#endif
 244        return 0;
 245}
 246
 247static int snd_opl3_seq_remove(struct device *_dev)
 248{
 249        struct snd_seq_device *dev = to_seq_dev(_dev);
 250        struct snd_opl3 *opl3;
 251
 252        opl3 = *(struct snd_opl3 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
 253        if (opl3 == NULL)
 254                return -EINVAL;
 255
 256#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
 257        snd_opl3_free_seq_oss(opl3);
 258#endif
 259        if (opl3->seq_client >= 0) {
 260                snd_seq_delete_kernel_client(opl3->seq_client);
 261                opl3->seq_client = -1;
 262        }
 263        return 0;
 264}
 265
 266static struct snd_seq_driver opl3_seq_driver = {
 267        .driver = {
 268                .name = KBUILD_MODNAME,
 269                .probe = snd_opl3_seq_probe,
 270                .remove = snd_opl3_seq_remove,
 271        },
 272        .id = SNDRV_SEQ_DEV_ID_OPL3,
 273        .argsize = sizeof(struct snd_opl3 *),
 274};
 275
 276module_snd_seq_driver(opl3_seq_driver);
 277