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gus_synth.c

/*
 *  Routines for Gravis UltraSound soundcards - Synthesizer
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *
 *
 *   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 <sound/driver.h>
#include <linux/init.h>
#include <linux/time.h>
#include <sound/core.h>
#include <sound/gus.h>
#include <sound/seq_device.h>

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("Routines for Gravis UltraSound soundcards - Synthesizer");
MODULE_LICENSE("GPL");

/*
 *
 */

static void snd_gus_synth_free_voices(struct snd_gus_card * gus, int client, int port)
{
      int idx;
      struct snd_gus_voice * voice;
      
      for (idx = 0; idx < 32; idx++) {
            voice = &gus->gf1.voices[idx];
            if (voice->use && voice->client == client && voice->port == port)
                  snd_gf1_free_voice(gus, voice);
      }
}

static int snd_gus_synth_use(void *private_data, struct snd_seq_port_subscribe *info)
{
      struct snd_gus_port * port = private_data;
      struct snd_gus_card * gus = port->gus;
      struct snd_gus_voice * voice;
      unsigned int idx;

      if (info->voices > 32)
            return -EINVAL;
      mutex_lock(&gus->register_mutex);
      if (!snd_gus_use_inc(gus)) {
            mutex_unlock(&gus->register_mutex);
            return -EFAULT;
      }
      for (idx = 0; idx < info->voices; idx++) {
            voice = snd_gf1_alloc_voice(gus, SNDRV_GF1_VOICE_TYPE_SYNTH, info->sender.client, info->sender.port);
            if (voice == NULL) {
                  snd_gus_synth_free_voices(gus, info->sender.client, info->sender.port);
                  snd_gus_use_dec(gus);
                  mutex_unlock(&gus->register_mutex);
                  return -EBUSY;
            }
            voice->index = idx;
      }
      mutex_unlock(&gus->register_mutex);
      return 0;
}

static int snd_gus_synth_unuse(void *private_data, struct snd_seq_port_subscribe *info)
{
      struct snd_gus_port * port = private_data;
      struct snd_gus_card * gus = port->gus;

      mutex_lock(&gus->register_mutex);
      snd_gus_synth_free_voices(gus, info->sender.client, info->sender.port);
      snd_gus_use_dec(gus);
      mutex_unlock(&gus->register_mutex);
      return 0;
}

/*
 *
 */

static void snd_gus_synth_free_private_instruments(struct snd_gus_port *p, int client)
{
      struct snd_seq_instr_header ifree;

      memset(&ifree, 0, sizeof(ifree));
      ifree.cmd = SNDRV_SEQ_INSTR_FREE_CMD_PRIVATE;
      snd_seq_instr_list_free_cond(p->gus->gf1.ilist, &ifree, client, 0);
}
 
static int snd_gus_synth_event_input(struct snd_seq_event *ev, int direct,
                             void *private_data, int atomic, int hop)
{
      struct snd_gus_port * p = private_data;
      
      snd_assert(p != NULL, return -EINVAL);
      if (ev->type >= SNDRV_SEQ_EVENT_SAMPLE &&
          ev->type <= SNDRV_SEQ_EVENT_SAMPLE_PRIVATE1) {
            snd_gus_sample_event(ev, p);
            return 0;
      }
      if (ev->source.client == SNDRV_SEQ_CLIENT_SYSTEM &&
          ev->source.port == SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE) {
            if (ev->type == SNDRV_SEQ_EVENT_CLIENT_EXIT) {
                  snd_gus_synth_free_private_instruments(p, ev->data.addr.client);
                  return 0;
            }
      }
      if (direct) {
            if (ev->type >= SNDRV_SEQ_EVENT_INSTR_BEGIN) {
                  snd_seq_instr_event(&p->gus->gf1.iwffff_ops.kops,
                                  p->gus->gf1.ilist,
                                  ev,
                                  p->gus->gf1.seq_client,
                                  atomic, hop);
                  return 0;
            }
      }
      return 0;
}

static void snd_gus_synth_instr_notify(void *private_data,
                               struct snd_seq_kinstr *instr,
                               int what)
{
      unsigned int idx;
      struct snd_gus_card *gus = private_data;
      struct snd_gus_voice *pvoice;
      unsigned long flags;
      
      spin_lock_irqsave(&gus->event_lock, flags);
      for (idx = 0; idx < 32; idx++) {
            pvoice = &gus->gf1.voices[idx];
            if (pvoice->use && !memcmp(&pvoice->instr, &instr->instr, sizeof(pvoice->instr))) {
                  if (pvoice->sample_ops && pvoice->sample_ops->sample_stop) {
                        pvoice->sample_ops->sample_stop(gus, pvoice, SAMPLE_STOP_IMMEDIATELY);
                  } else {
                        snd_gf1_stop_voice(gus, pvoice->number);
                        pvoice->flags &= ~SNDRV_GF1_VFLG_RUNNING;
                  }
            }
      }
      spin_unlock_irqrestore(&gus->event_lock, flags);
}

/*
 *
 */

static void snd_gus_synth_free_port(void *private_data)
{
      struct snd_gus_port * p = private_data;
      
      if (p)
            snd_midi_channel_free_set(p->chset);
}

static int snd_gus_synth_create_port(struct snd_gus_card * gus, int idx)
{
      struct snd_gus_port * p;
      struct snd_seq_port_callback callbacks;
      char name[32];
      int result;
      
      p = &gus->gf1.seq_ports[idx];
      p->chset = snd_midi_channel_alloc_set(16);
      if (p->chset == NULL)
            return -ENOMEM;
      p->chset->private_data = p;
      p->gus = gus;
      p->client = gus->gf1.seq_client;

      memset(&callbacks, 0, sizeof(callbacks));
      callbacks.owner = THIS_MODULE;
      callbacks.use = snd_gus_synth_use;
      callbacks.unuse = snd_gus_synth_unuse;
      callbacks.event_input = snd_gus_synth_event_input;
      callbacks.private_free = snd_gus_synth_free_port;
      callbacks.private_data = p;
      
      sprintf(name, "%s port %i", gus->interwave ? "AMD InterWave" : "GF1", idx);
      p->chset->port = snd_seq_event_port_attach(gus->gf1.seq_client,
                                       &callbacks,
                                       SNDRV_SEQ_PORT_CAP_WRITE | SNDRV_SEQ_PORT_CAP_SUBS_WRITE,
                                       SNDRV_SEQ_PORT_TYPE_DIRECT_SAMPLE |
                                       SNDRV_SEQ_PORT_TYPE_SYNTH |
                                       SNDRV_SEQ_PORT_TYPE_HARDWARE |
                                       SNDRV_SEQ_PORT_TYPE_SYNTHESIZER,
                                       16, 0,
                                       name);
      if (p->chset->port < 0) {
            result = p->chset->port;
            snd_gus_synth_free_port(p);
            return result;
      }
      p->port = p->chset->port;
      return 0;
}                                    

/*
 *
 */

static int snd_gus_synth_new_device(struct snd_seq_device *dev)
{
      struct snd_gus_card *gus;
      int client, i;
      struct snd_seq_port_subscribe sub;
      struct snd_iwffff_ops *iwops;
      struct snd_gf1_ops *gf1ops;
      struct snd_simple_ops *simpleops;

      gus = *(struct snd_gus_card **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
      if (gus == NULL)
            return -EINVAL;

      mutex_init(&gus->register_mutex);
      gus->gf1.seq_client = -1;
      
      /* allocate new client */
      client = gus->gf1.seq_client =
            snd_seq_create_kernel_client(gus->card, 1, gus->interwave ?
                                   "AMD InterWave" : "GF1");
      if (client < 0)
            return client;

      for (i = 0; i < 4; i++)
            snd_gus_synth_create_port(gus, i);
            
      gus->gf1.ilist = snd_seq_instr_list_new();
      if (gus->gf1.ilist == NULL) {
            snd_seq_delete_kernel_client(client);     
            gus->gf1.seq_client = -1;
            return -ENOMEM;
      }
      gus->gf1.ilist->flags = SNDRV_SEQ_INSTR_FLG_DIRECT;

      simpleops = &gus->gf1.simple_ops;
      snd_seq_simple_init(simpleops, gus, NULL);
      simpleops->put_sample = snd_gus_simple_put_sample;
      simpleops->get_sample = snd_gus_simple_get_sample;
      simpleops->remove_sample = snd_gus_simple_remove_sample;
      simpleops->notify = snd_gus_synth_instr_notify;

      gf1ops = &gus->gf1.gf1_ops;
      snd_seq_gf1_init(gf1ops, gus, &simpleops->kops);
      gf1ops->put_sample = snd_gus_gf1_put_sample;
      gf1ops->get_sample = snd_gus_gf1_get_sample;
      gf1ops->remove_sample = snd_gus_gf1_remove_sample;
      gf1ops->notify = snd_gus_synth_instr_notify;

      iwops = &gus->gf1.iwffff_ops;
      snd_seq_iwffff_init(iwops, gus, &gf1ops->kops);
      iwops->put_sample = snd_gus_iwffff_put_sample;
      iwops->get_sample = snd_gus_iwffff_get_sample;
      iwops->remove_sample = snd_gus_iwffff_remove_sample;
      iwops->notify = snd_gus_synth_instr_notify;

      memset(&sub, 0, sizeof(sub));
      sub.sender.client = SNDRV_SEQ_CLIENT_SYSTEM;
      sub.sender.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
      sub.dest.client = client;
      sub.dest.port = 0;
      snd_seq_kernel_client_ctl(client, SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, &sub);

      return 0;
}

static int snd_gus_synth_delete_device(struct snd_seq_device *dev)
{
      struct snd_gus_card *gus;

      gus = *(struct snd_gus_card **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
      if (gus == NULL)
            return -EINVAL;

      if (gus->gf1.seq_client >= 0) {
            snd_seq_delete_kernel_client(gus->gf1.seq_client);    
            gus->gf1.seq_client = -1;
      }
      if (gus->gf1.ilist)
            snd_seq_instr_list_free(&gus->gf1.ilist);
      return 0;
}

static int __init alsa_gus_synth_init(void)
{
      static struct snd_seq_dev_ops ops = {
            snd_gus_synth_new_device,
            snd_gus_synth_delete_device
      };

      return snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_GUS, &ops,
                                    sizeof(struct snd_gus_card *));
}

static void __exit alsa_gus_synth_exit(void)
{
      snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_GUS);
}

module_init(alsa_gus_synth_init)
module_exit(alsa_gus_synth_exit)

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