linux/sound/drivers/opl3/opl3_seq.c
Takashi Iwai 3d774d5ef0 ALSA: seq: Allow the tristate build of OSS emulation
Currently OSS sequencer emulation is tied with ALSA sequencer core,
both are built in the same level; i.e. when CONFIG_SND_SEQUENCER=y,
the OSS sequencer emulation is also always built-in, even though the
functionality can be built as an individual module.

This patch changes the rule and allows users to build snd-seq-oss
module while others are built-in.  Essentially, it's just a few simple
changes in Kconfig and Makefile.  Some driver codes like opl3 need to
convert from the simple ifdef to IS_ENABLED().  But that's all.

You might wonder how about the dependency: right, it can be messy, but
it still works.  Since we rewrote the sequencer binding with the
standard bus, the driver can be bound at any time on demand.  So, the
synthesizer driver module can be loaded individually from the OSS
emulation core before/after it.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2017-06-09 22:09:45 +02:00

291 lines
7.3 KiB
C

/*
* Copyright (c) by Uros Bizjak <uros@kss-loka.si>
*
* Midi Sequencer interface routines for OPL2/OPL3/OPL4 FM
*
* OPL2/3 FM instrument loader:
* alsa-tools/seq/sbiload/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "opl3_voice.h"
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/module.h>
#include <sound/initval.h>
MODULE_AUTHOR("Uros Bizjak <uros@kss-loka.si>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ALSA driver for OPL3 FM synth");
bool use_internal_drums = 0;
module_param(use_internal_drums, bool, 0444);
MODULE_PARM_DESC(use_internal_drums, "Enable internal OPL2/3 drums.");
int snd_opl3_synth_use_inc(struct snd_opl3 * opl3)
{
if (!try_module_get(opl3->card->module))
return -EFAULT;
return 0;
}
void snd_opl3_synth_use_dec(struct snd_opl3 * opl3)
{
module_put(opl3->card->module);
}
int snd_opl3_synth_setup(struct snd_opl3 * opl3)
{
int idx;
struct snd_hwdep *hwdep = opl3->hwdep;
mutex_lock(&hwdep->open_mutex);
if (hwdep->used) {
mutex_unlock(&hwdep->open_mutex);
return -EBUSY;
}
hwdep->used++;
mutex_unlock(&hwdep->open_mutex);
snd_opl3_reset(opl3);
for (idx = 0; idx < MAX_OPL3_VOICES; idx++) {
opl3->voices[idx].state = SNDRV_OPL3_ST_OFF;
opl3->voices[idx].time = 0;
opl3->voices[idx].keyon_reg = 0x00;
}
opl3->use_time = 0;
opl3->connection_reg = 0x00;
if (opl3->hardware >= OPL3_HW_OPL3) {
/* Clear 4-op connections */
opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT,
opl3->connection_reg);
opl3->max_voices = MAX_OPL3_VOICES;
}
return 0;
}
void snd_opl3_synth_cleanup(struct snd_opl3 * opl3)
{
unsigned long flags;
struct snd_hwdep *hwdep;
/* Stop system timer */
spin_lock_irqsave(&opl3->sys_timer_lock, flags);
if (opl3->sys_timer_status) {
del_timer(&opl3->tlist);
opl3->sys_timer_status = 0;
}
spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
snd_opl3_reset(opl3);
hwdep = opl3->hwdep;
mutex_lock(&hwdep->open_mutex);
hwdep->used--;
mutex_unlock(&hwdep->open_mutex);
wake_up(&hwdep->open_wait);
}
static int snd_opl3_synth_use(void *private_data, struct snd_seq_port_subscribe * info)
{
struct snd_opl3 *opl3 = private_data;
int err;
if ((err = snd_opl3_synth_setup(opl3)) < 0)
return err;
if (use_internal_drums) {
/* Percussion mode */
opl3->voices[6].state = opl3->voices[7].state =
opl3->voices[8].state = SNDRV_OPL3_ST_NOT_AVAIL;
snd_opl3_load_drums(opl3);
opl3->drum_reg = OPL3_PERCUSSION_ENABLE;
opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, opl3->drum_reg);
} else {
opl3->drum_reg = 0x00;
}
if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM) {
if ((err = snd_opl3_synth_use_inc(opl3)) < 0)
return err;
}
opl3->synth_mode = SNDRV_OPL3_MODE_SEQ;
return 0;
}
static int snd_opl3_synth_unuse(void *private_data, struct snd_seq_port_subscribe * info)
{
struct snd_opl3 *opl3 = private_data;
snd_opl3_synth_cleanup(opl3);
if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM)
snd_opl3_synth_use_dec(opl3);
return 0;
}
/*
* MIDI emulation operators
*/
struct snd_midi_op opl3_ops = {
.note_on = snd_opl3_note_on,
.note_off = snd_opl3_note_off,
.key_press = snd_opl3_key_press,
.note_terminate = snd_opl3_terminate_note,
.control = snd_opl3_control,
.nrpn = snd_opl3_nrpn,
.sysex = snd_opl3_sysex,
};
static int snd_opl3_synth_event_input(struct snd_seq_event * ev, int direct,
void *private_data, int atomic, int hop)
{
struct snd_opl3 *opl3 = private_data;
snd_midi_process_event(&opl3_ops, ev, opl3->chset);
return 0;
}
/* ------------------------------ */
static void snd_opl3_synth_free_port(void *private_data)
{
struct snd_opl3 *opl3 = private_data;
snd_midi_channel_free_set(opl3->chset);
}
static int snd_opl3_synth_create_port(struct snd_opl3 * opl3)
{
struct snd_seq_port_callback callbacks;
char name[32];
int voices, opl_ver;
voices = (opl3->hardware < OPL3_HW_OPL3) ?
MAX_OPL2_VOICES : MAX_OPL3_VOICES;
opl3->chset = snd_midi_channel_alloc_set(16);
if (opl3->chset == NULL)
return -ENOMEM;
opl3->chset->private_data = opl3;
memset(&callbacks, 0, sizeof(callbacks));
callbacks.owner = THIS_MODULE;
callbacks.use = snd_opl3_synth_use;
callbacks.unuse = snd_opl3_synth_unuse;
callbacks.event_input = snd_opl3_synth_event_input;
callbacks.private_free = snd_opl3_synth_free_port;
callbacks.private_data = opl3;
opl_ver = (opl3->hardware & OPL3_HW_MASK) >> 8;
sprintf(name, "OPL%i FM Port", opl_ver);
opl3->chset->client = opl3->seq_client;
opl3->chset->port = snd_seq_event_port_attach(opl3->seq_client, &callbacks,
SNDRV_SEQ_PORT_CAP_WRITE |
SNDRV_SEQ_PORT_CAP_SUBS_WRITE,
SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
SNDRV_SEQ_PORT_TYPE_MIDI_GM |
SNDRV_SEQ_PORT_TYPE_DIRECT_SAMPLE |
SNDRV_SEQ_PORT_TYPE_HARDWARE |
SNDRV_SEQ_PORT_TYPE_SYNTHESIZER,
16, voices,
name);
if (opl3->chset->port < 0) {
int port;
port = opl3->chset->port;
snd_midi_channel_free_set(opl3->chset);
return port;
}
return 0;
}
/* ------------------------------ */
static int snd_opl3_seq_probe(struct device *_dev)
{
struct snd_seq_device *dev = to_seq_dev(_dev);
struct snd_opl3 *opl3;
int client, err;
char name[32];
int opl_ver;
opl3 = *(struct snd_opl3 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
if (opl3 == NULL)
return -EINVAL;
spin_lock_init(&opl3->voice_lock);
opl3->seq_client = -1;
/* allocate new client */
opl_ver = (opl3->hardware & OPL3_HW_MASK) >> 8;
sprintf(name, "OPL%i FM synth", opl_ver);
client = opl3->seq_client =
snd_seq_create_kernel_client(opl3->card, opl3->seq_dev_num,
name);
if (client < 0)
return client;
if ((err = snd_opl3_synth_create_port(opl3)) < 0) {
snd_seq_delete_kernel_client(client);
opl3->seq_client = -1;
return err;
}
/* setup system timer */
setup_timer(&opl3->tlist, snd_opl3_timer_func, (unsigned long) opl3);
spin_lock_init(&opl3->sys_timer_lock);
opl3->sys_timer_status = 0;
#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
snd_opl3_init_seq_oss(opl3, name);
#endif
return 0;
}
static int snd_opl3_seq_remove(struct device *_dev)
{
struct snd_seq_device *dev = to_seq_dev(_dev);
struct snd_opl3 *opl3;
opl3 = *(struct snd_opl3 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
if (opl3 == NULL)
return -EINVAL;
#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
snd_opl3_free_seq_oss(opl3);
#endif
if (opl3->seq_client >= 0) {
snd_seq_delete_kernel_client(opl3->seq_client);
opl3->seq_client = -1;
}
return 0;
}
static struct snd_seq_driver opl3_seq_driver = {
.driver = {
.name = KBUILD_MODNAME,
.probe = snd_opl3_seq_probe,
.remove = snd_opl3_seq_remove,
},
.id = SNDRV_SEQ_DEV_ID_OPL3,
.argsize = sizeof(struct snd_opl3 *),
};
module_snd_seq_driver(opl3_seq_driver);