280 lines
6.7 KiB
C
280 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) by Uros Bizjak <uros@kss-loka.si>
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*
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* Midi Sequencer interface routines for OPL2/OPL3/OPL4 FM
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*
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* OPL2/3 FM instrument loader:
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* alsa-tools/seq/sbiload/
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*/
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#include "opl3_voice.h"
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#include <linux/init.h>
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#include <linux/moduleparam.h>
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#include <linux/module.h>
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#include <sound/initval.h>
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MODULE_AUTHOR("Uros Bizjak <uros@kss-loka.si>");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("ALSA driver for OPL3 FM synth");
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bool use_internal_drums = 0;
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module_param(use_internal_drums, bool, 0444);
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MODULE_PARM_DESC(use_internal_drums, "Enable internal OPL2/3 drums.");
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int snd_opl3_synth_use_inc(struct snd_opl3 * opl3)
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{
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if (!try_module_get(opl3->card->module))
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return -EFAULT;
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return 0;
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}
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void snd_opl3_synth_use_dec(struct snd_opl3 * opl3)
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{
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module_put(opl3->card->module);
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}
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int snd_opl3_synth_setup(struct snd_opl3 * opl3)
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{
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int idx;
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struct snd_hwdep *hwdep = opl3->hwdep;
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mutex_lock(&hwdep->open_mutex);
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if (hwdep->used) {
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mutex_unlock(&hwdep->open_mutex);
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return -EBUSY;
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}
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hwdep->used++;
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mutex_unlock(&hwdep->open_mutex);
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snd_opl3_reset(opl3);
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for (idx = 0; idx < MAX_OPL3_VOICES; idx++) {
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opl3->voices[idx].state = SNDRV_OPL3_ST_OFF;
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opl3->voices[idx].time = 0;
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opl3->voices[idx].keyon_reg = 0x00;
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}
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opl3->use_time = 0;
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opl3->connection_reg = 0x00;
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if (opl3->hardware >= OPL3_HW_OPL3) {
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/* Clear 4-op connections */
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opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT,
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opl3->connection_reg);
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opl3->max_voices = MAX_OPL3_VOICES;
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}
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return 0;
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}
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void snd_opl3_synth_cleanup(struct snd_opl3 * opl3)
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{
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unsigned long flags;
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struct snd_hwdep *hwdep;
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/* Stop system timer */
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spin_lock_irqsave(&opl3->sys_timer_lock, flags);
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if (opl3->sys_timer_status) {
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del_timer(&opl3->tlist);
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opl3->sys_timer_status = 0;
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}
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spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
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snd_opl3_reset(opl3);
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hwdep = opl3->hwdep;
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mutex_lock(&hwdep->open_mutex);
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hwdep->used--;
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mutex_unlock(&hwdep->open_mutex);
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wake_up(&hwdep->open_wait);
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}
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static int snd_opl3_synth_use(void *private_data, struct snd_seq_port_subscribe * info)
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{
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struct snd_opl3 *opl3 = private_data;
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int err;
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err = snd_opl3_synth_setup(opl3);
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if (err < 0)
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return err;
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if (use_internal_drums) {
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/* Percussion mode */
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opl3->voices[6].state = opl3->voices[7].state =
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opl3->voices[8].state = SNDRV_OPL3_ST_NOT_AVAIL;
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snd_opl3_load_drums(opl3);
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opl3->drum_reg = OPL3_PERCUSSION_ENABLE;
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opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, opl3->drum_reg);
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} else {
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opl3->drum_reg = 0x00;
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}
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if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM) {
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err = snd_opl3_synth_use_inc(opl3);
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if (err < 0)
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return err;
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}
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opl3->synth_mode = SNDRV_OPL3_MODE_SEQ;
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return 0;
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}
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static int snd_opl3_synth_unuse(void *private_data, struct snd_seq_port_subscribe * info)
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{
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struct snd_opl3 *opl3 = private_data;
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snd_opl3_synth_cleanup(opl3);
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if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM)
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snd_opl3_synth_use_dec(opl3);
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return 0;
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}
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/*
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* MIDI emulation operators
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*/
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const struct snd_midi_op opl3_ops = {
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.note_on = snd_opl3_note_on,
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.note_off = snd_opl3_note_off,
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.key_press = snd_opl3_key_press,
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.note_terminate = snd_opl3_terminate_note,
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.control = snd_opl3_control,
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.nrpn = snd_opl3_nrpn,
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.sysex = snd_opl3_sysex,
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};
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static int snd_opl3_synth_event_input(struct snd_seq_event * ev, int direct,
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void *private_data, int atomic, int hop)
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{
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struct snd_opl3 *opl3 = private_data;
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snd_midi_process_event(&opl3_ops, ev, opl3->chset);
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return 0;
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}
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/* ------------------------------ */
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static void snd_opl3_synth_free_port(void *private_data)
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{
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struct snd_opl3 *opl3 = private_data;
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snd_midi_channel_free_set(opl3->chset);
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}
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static int snd_opl3_synth_create_port(struct snd_opl3 * opl3)
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{
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struct snd_seq_port_callback callbacks;
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char name[32];
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int voices, opl_ver;
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voices = (opl3->hardware < OPL3_HW_OPL3) ?
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MAX_OPL2_VOICES : MAX_OPL3_VOICES;
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opl3->chset = snd_midi_channel_alloc_set(16);
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if (opl3->chset == NULL)
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return -ENOMEM;
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opl3->chset->private_data = opl3;
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memset(&callbacks, 0, sizeof(callbacks));
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callbacks.owner = THIS_MODULE;
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callbacks.use = snd_opl3_synth_use;
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callbacks.unuse = snd_opl3_synth_unuse;
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callbacks.event_input = snd_opl3_synth_event_input;
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callbacks.private_free = snd_opl3_synth_free_port;
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callbacks.private_data = opl3;
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opl_ver = (opl3->hardware & OPL3_HW_MASK) >> 8;
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sprintf(name, "OPL%i FM Port", opl_ver);
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opl3->chset->client = opl3->seq_client;
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opl3->chset->port = snd_seq_event_port_attach(opl3->seq_client, &callbacks,
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SNDRV_SEQ_PORT_CAP_WRITE |
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SNDRV_SEQ_PORT_CAP_SUBS_WRITE,
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SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
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SNDRV_SEQ_PORT_TYPE_MIDI_GM |
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SNDRV_SEQ_PORT_TYPE_DIRECT_SAMPLE |
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SNDRV_SEQ_PORT_TYPE_HARDWARE |
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SNDRV_SEQ_PORT_TYPE_SYNTHESIZER,
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16, voices,
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name);
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if (opl3->chset->port < 0) {
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int port;
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port = opl3->chset->port;
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snd_midi_channel_free_set(opl3->chset);
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return port;
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}
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return 0;
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}
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/* ------------------------------ */
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static int snd_opl3_seq_probe(struct device *_dev)
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{
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struct snd_seq_device *dev = to_seq_dev(_dev);
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struct snd_opl3 *opl3;
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int client, err;
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char name[32];
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int opl_ver;
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opl3 = *(struct snd_opl3 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
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if (opl3 == NULL)
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return -EINVAL;
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spin_lock_init(&opl3->voice_lock);
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opl3->seq_client = -1;
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/* allocate new client */
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opl_ver = (opl3->hardware & OPL3_HW_MASK) >> 8;
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sprintf(name, "OPL%i FM synth", opl_ver);
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client = opl3->seq_client =
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snd_seq_create_kernel_client(opl3->card, opl3->seq_dev_num,
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name);
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if (client < 0)
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return client;
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err = snd_opl3_synth_create_port(opl3);
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if (err < 0) {
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snd_seq_delete_kernel_client(client);
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opl3->seq_client = -1;
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return err;
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}
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/* setup system timer */
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timer_setup(&opl3->tlist, snd_opl3_timer_func, 0);
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spin_lock_init(&opl3->sys_timer_lock);
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opl3->sys_timer_status = 0;
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#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
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snd_opl3_init_seq_oss(opl3, name);
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#endif
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return 0;
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}
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static int snd_opl3_seq_remove(struct device *_dev)
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{
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struct snd_seq_device *dev = to_seq_dev(_dev);
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struct snd_opl3 *opl3;
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opl3 = *(struct snd_opl3 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
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if (opl3 == NULL)
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return -EINVAL;
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#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
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snd_opl3_free_seq_oss(opl3);
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#endif
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if (opl3->seq_client >= 0) {
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snd_seq_delete_kernel_client(opl3->seq_client);
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opl3->seq_client = -1;
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}
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return 0;
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}
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static struct snd_seq_driver opl3_seq_driver = {
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.driver = {
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.name = KBUILD_MODNAME,
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.probe = snd_opl3_seq_probe,
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.remove = snd_opl3_seq_remove,
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},
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.id = SNDRV_SEQ_DEV_ID_OPL3,
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.argsize = sizeof(struct snd_opl3 *),
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};
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module_snd_seq_driver(opl3_seq_driver);
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