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gus_synth.c

/*
 *  Routines for Gravis UltraSound soundcards - Synthesizer
 *  Copyright (c) by Jaroslav Kysela <perex@suse.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@suse.cz>");
MODULE_DESCRIPTION("Routines for Gravis UltraSound soundcards - Synthesizer");
MODULE_LICENSE("GPL");

/*
 *
 */

static void snd_gus_synth_free_voices(snd_gus_card_t * gus, int client, int port)
{
      int idx;
      snd_gus_voice_t * 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, snd_seq_port_subscribe_t *info)
{
      snd_gus_port_t * port = (snd_gus_port_t *)private_data;
      snd_gus_card_t * gus = port->gus;
      snd_gus_voice_t * voice;
      unsigned int idx;

      if (info->voices > 32)
            return -EINVAL;
      down(&gus->register_mutex);
      if (!snd_gus_use_inc(gus)) {
            up(&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);
                  up(&gus->register_mutex);
                  return -EBUSY;
            }
            voice->index = idx;
      }
      up(&gus->register_mutex);
      return 0;
}

static int snd_gus_synth_unuse(void *private_data, snd_seq_port_subscribe_t *info)
{
      snd_gus_port_t * port = (snd_gus_port_t *)private_data;
      snd_gus_card_t * gus = port->gus;

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

/*
 *
 */

static void snd_gus_synth_free_private_instruments(snd_gus_port_t *p, int client)
{
      snd_seq_instr_header_t 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);
}
 
int snd_gus_synth_event_input(snd_seq_event_t *ev, int direct, void *private_data, int atomic, int hop)
{
      snd_gus_port_t * p = (snd_gus_port_t *) 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,
                               snd_seq_kinstr_t *instr,
                               int what)
{
      unsigned int idx;
      snd_gus_card_t *gus = private_data;
      snd_gus_voice_t *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)
{
      snd_gus_port_t * p = (snd_gus_port_t *)private_data;
      
      if (p)
            snd_midi_channel_free_set(p->chset);
}

static int snd_gus_synth_create_port(snd_gus_card_t * gus, int idx)
{
      snd_gus_port_t * p;
      snd_seq_port_callback_t 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,
                                       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(snd_seq_device_t *dev)
{
      snd_gus_card_t *gus;
      int client, i;
      snd_seq_client_callback_t callbacks;
      snd_seq_client_info_t cinfo;
      snd_seq_port_subscribe_t sub;
      snd_iwffff_ops_t *iwops;
      snd_gf1_ops_t *gf1ops;
      snd_simple_ops_t *simpleops;

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

      init_MUTEX(&gus->register_mutex);
      gus->gf1.seq_client = -1;
      
      /* allocate new client */
      memset(&callbacks, 0, sizeof(callbacks));
      callbacks.private_data = gus;
      callbacks.allow_output = callbacks.allow_input = 1;
      client = gus->gf1.seq_client =
                  snd_seq_create_kernel_client(gus->card, 1, &callbacks);
      if (client < 0)
            return client;

      /* change name of client */
      memset(&cinfo, 0, sizeof(cinfo));
      cinfo.client = client;
      cinfo.type = KERNEL_CLIENT;
      sprintf(cinfo.name, gus->interwave ? "AMD InterWave" : "GF1");
      snd_seq_kernel_client_ctl(client, SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, &cinfo);

      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(snd_seq_device_t *dev)
{
      snd_gus_card_t *gus;

      gus = *(snd_gus_card_t**)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 snd_seq_dev_ops_t ops = {
            snd_gus_synth_new_device,
            snd_gus_synth_delete_device
      };

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

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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