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/*

 * 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)