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DEFINITIONS
This source file includes following definitions.
- snd_opl4_seq_use_inc
- snd_opl4_seq_use_dec
- snd_opl4_seq_use
- snd_opl4_seq_unuse
- snd_opl4_seq_event_input
- snd_opl4_seq_free_port
- snd_opl4_seq_new_device
- snd_opl4_seq_delete_device
- alsa_opl4_synth_init
- alsa_opl4_synth_exit
/*
* OPL4 sequencer functions
*
* Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, this software may be distributed and/or modified 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 SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "opl4_local.h"
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <sound/initval.h>
MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
MODULE_DESCRIPTION("OPL4 wavetable synth driver");
MODULE_LICENSE("Dual BSD/GPL");
int volume_boost = 8;
module_param(volume_boost, int, 0644);
MODULE_PARM_DESC(volume_boost, "Additional volume for OPL4 wavetable sounds.");
static int snd_opl4_seq_use_inc(struct snd_opl4 *opl4)
{
if (!try_module_get(opl4->card->module))
return -EFAULT;
return 0;
}
static void snd_opl4_seq_use_dec(struct snd_opl4 *opl4)
{
module_put(opl4->card->module);
}
static int snd_opl4_seq_use(void *private_data, struct snd_seq_port_subscribe *info)
{
struct snd_opl4 *opl4 = private_data;
int err;
mutex_lock(&opl4->access_mutex);
if (opl4->used) {
mutex_unlock(&opl4->access_mutex);
return -EBUSY;
}
opl4->used++;
if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM) {
err = snd_opl4_seq_use_inc(opl4);
if (err < 0) {
mutex_unlock(&opl4->access_mutex);
return err;
}
}
mutex_unlock(&opl4->access_mutex);
snd_opl4_synth_reset(opl4);
return 0;
}
static int snd_opl4_seq_unuse(void *private_data, struct snd_seq_port_subscribe *info)
{
struct snd_opl4 *opl4 = private_data;
snd_opl4_synth_shutdown(opl4);
mutex_lock(&opl4->access_mutex);
opl4->used--;
mutex_unlock(&opl4->access_mutex);
if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM)
snd_opl4_seq_use_dec(opl4);
return 0;
}
static struct snd_midi_op opl4_ops = {
.note_on = snd_opl4_note_on,
.note_off = snd_opl4_note_off,
.note_terminate = snd_opl4_terminate_note,
.control = snd_opl4_control,
.sysex = snd_opl4_sysex,
};
static int snd_opl4_seq_event_input(struct snd_seq_event *ev, int direct,
void *private_data, int atomic, int hop)
{
struct snd_opl4 *opl4 = private_data;
snd_midi_process_event(&opl4_ops, ev, opl4->chset);
return 0;
}
static void snd_opl4_seq_free_port(void *private_data)
{
struct snd_opl4 *opl4 = private_data;
snd_midi_channel_free_set(opl4->chset);
}
static int snd_opl4_seq_new_device(struct snd_seq_device *dev)
{
struct snd_opl4 *opl4;
int client;
struct snd_seq_port_callback pcallbacks;
opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
if (!opl4)
return -EINVAL;
if (snd_yrw801_detect(opl4) < 0)
return -ENODEV;
opl4->chset = snd_midi_channel_alloc_set(16);
if (!opl4->chset)
return -ENOMEM;
opl4->chset->private_data = opl4;
/* allocate new client */
client = snd_seq_create_kernel_client(opl4->card, opl4->seq_dev_num,
"OPL4 Wavetable");
if (client < 0) {
snd_midi_channel_free_set(opl4->chset);
return client;
}
opl4->seq_client = client;
opl4->chset->client = client;
/* create new port */
memset(&pcallbacks, 0, sizeof(pcallbacks));
pcallbacks.owner = THIS_MODULE;
pcallbacks.use = snd_opl4_seq_use;
pcallbacks.unuse = snd_opl4_seq_unuse;
pcallbacks.event_input = snd_opl4_seq_event_input;
pcallbacks.private_free = snd_opl4_seq_free_port;
pcallbacks.private_data = opl4;
opl4->chset->port = snd_seq_event_port_attach(client, &pcallbacks,
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_HARDWARE |
SNDRV_SEQ_PORT_TYPE_SYNTHESIZER,
16, 24,
"OPL4 Wavetable Port");
if (opl4->chset->port < 0) {
int err = opl4->chset->port;
snd_midi_channel_free_set(opl4->chset);
snd_seq_delete_kernel_client(client);
opl4->seq_client = -1;
return err;
}
return 0;
}
static int snd_opl4_seq_delete_device(struct snd_seq_device *dev)
{
struct snd_opl4 *opl4;
opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
if (!opl4)
return -EINVAL;
if (opl4->seq_client >= 0) {
snd_seq_delete_kernel_client(opl4->seq_client);
opl4->seq_client = -1;
}
return 0;
}
static int __init alsa_opl4_synth_init(void)
{
static struct snd_seq_dev_ops ops = {
snd_opl4_seq_new_device,
snd_opl4_seq_delete_device
};
return snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OPL4, &ops,
sizeof(struct snd_opl4 *));
}
static void __exit alsa_opl4_synth_exit(void)
{
snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OPL4);
}
module_init(alsa_opl4_synth_init)
module_exit(alsa_opl4_synth_exit)