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sound_oss.c

/*
 *  Advanced Linux Sound Architecture
 *  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>

#ifdef CONFIG_SND_OSSEMUL

#if !defined(CONFIG_SOUND) && !(defined(MODULE) && defined(CONFIG_SOUND_MODULE))
#error "Enable the OSS soundcore multiplexer (CONFIG_SOUND) in the kernel."
#endif

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <sound/core.h>
#include <sound/minors.h>
#include <sound/info.h>
#include <linux/sound.h>
#include <linux/mutex.h>

#define SNDRV_OSS_MINORS 128

static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
static DEFINE_MUTEX(sound_oss_mutex);

void *snd_lookup_oss_minor_data(unsigned int minor, int type)
{
      struct snd_minor *mreg;
      void *private_data;

      if (minor >= ARRAY_SIZE(snd_oss_minors))
            return NULL;
      mutex_lock(&sound_oss_mutex);
      mreg = snd_oss_minors[minor];
      if (mreg && mreg->type == type)
            private_data = mreg->private_data;
      else
            private_data = NULL;
      mutex_unlock(&sound_oss_mutex);
      return private_data;
}

EXPORT_SYMBOL(snd_lookup_oss_minor_data);

static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
{
      int minor;

      switch (type) {
      case SNDRV_OSS_DEVICE_TYPE_MIXER:
            snd_assert(card != NULL && dev <= 1, return -EINVAL);
            minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
            break;
      case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
            minor = SNDRV_MINOR_OSS_SEQUENCER;
            break;
      case SNDRV_OSS_DEVICE_TYPE_MUSIC:
            minor = SNDRV_MINOR_OSS_MUSIC;
            break;
      case SNDRV_OSS_DEVICE_TYPE_PCM:
            snd_assert(card != NULL && dev <= 1, return -EINVAL);
            minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
            break;
      case SNDRV_OSS_DEVICE_TYPE_MIDI:
            snd_assert(card != NULL && dev <= 1, return -EINVAL);
            minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
            break;
      case SNDRV_OSS_DEVICE_TYPE_DMFM:
            minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
            break;
      case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
            minor = SNDRV_MINOR_OSS_SNDSTAT;
            break;
      default:
            return -EINVAL;
      }
      snd_assert(minor >= 0 && minor < SNDRV_OSS_MINORS, return -EINVAL);
      return minor;
}

int snd_register_oss_device(int type, struct snd_card *card, int dev,
                      const struct file_operations *f_ops, void *private_data,
                      const char *name)
{
      int minor = snd_oss_kernel_minor(type, card, dev);
      int minor_unit;
      struct snd_minor *preg;
      int cidx = SNDRV_MINOR_OSS_CARD(minor);
      int track2 = -1;
      int register1 = -1, register2 = -1;
      struct device *carddev = NULL;

      if (card && card->number >= 8)
            return 0; /* ignore silently */
      if (minor < 0)
            return minor;
      preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
      if (preg == NULL)
            return -ENOMEM;
      preg->type = type;
      preg->card = card ? card->number : -1;
      preg->device = dev;
      preg->f_ops = f_ops;
      preg->private_data = private_data;
      mutex_lock(&sound_oss_mutex);
      snd_oss_minors[minor] = preg;
      minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
      switch (minor_unit) {
      case SNDRV_MINOR_OSS_PCM:
            track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
            break;
      case SNDRV_MINOR_OSS_MIDI:
            track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
            break;
      case SNDRV_MINOR_OSS_MIDI1:
            track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
            break;
      }
      if (card)
            carddev = card->dev;
      register1 = register_sound_special_device(f_ops, minor, carddev);
      if (register1 != minor)
            goto __end;
      if (track2 >= 0) {
            register2 = register_sound_special_device(f_ops, track2,
                                            carddev);
            if (register2 != track2)
                  goto __end;
            snd_oss_minors[track2] = preg;
      }
      mutex_unlock(&sound_oss_mutex);
      return 0;

      __end:
            if (register2 >= 0)
                  unregister_sound_special(register2);
            if (register1 >= 0)
                  unregister_sound_special(register1);
      snd_oss_minors[minor] = NULL;
      mutex_unlock(&sound_oss_mutex);
      kfree(preg);
            return -EBUSY;
}

EXPORT_SYMBOL(snd_register_oss_device);

int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
{
      int minor = snd_oss_kernel_minor(type, card, dev);
      int cidx = SNDRV_MINOR_OSS_CARD(minor);
      int track2 = -1;
      struct snd_minor *mptr;

      if (card && card->number >= 8)
            return 0;
      if (minor < 0)
            return minor;
      mutex_lock(&sound_oss_mutex);
      mptr = snd_oss_minors[minor];
      if (mptr == NULL) {
            mutex_unlock(&sound_oss_mutex);
            return -ENOENT;
      }
      unregister_sound_special(minor);
      switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
      case SNDRV_MINOR_OSS_PCM:
            track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
            break;
      case SNDRV_MINOR_OSS_MIDI:
            track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
            break;
      case SNDRV_MINOR_OSS_MIDI1:
            track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
            break;
      }
      if (track2 >= 0) {
            unregister_sound_special(track2);
            snd_oss_minors[track2] = NULL;
      }
      snd_oss_minors[minor] = NULL;
      mutex_unlock(&sound_oss_mutex);
      kfree(mptr);
      return 0;
}

EXPORT_SYMBOL(snd_unregister_oss_device);

/*
 *  INFO PART
 */

#ifdef CONFIG_PROC_FS

static struct snd_info_entry *snd_minor_info_oss_entry;

static const char *snd_oss_device_type_name(int type)
{
      switch (type) {
      case SNDRV_OSS_DEVICE_TYPE_MIXER:
            return "mixer";
      case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
      case SNDRV_OSS_DEVICE_TYPE_MUSIC:
            return "sequencer";
      case SNDRV_OSS_DEVICE_TYPE_PCM:
            return "digital audio";
      case SNDRV_OSS_DEVICE_TYPE_MIDI:
            return "raw midi";
      case SNDRV_OSS_DEVICE_TYPE_DMFM:
            return "hardware dependent";
      default:
            return "?";
      }
}

static void snd_minor_info_oss_read(struct snd_info_entry *entry,
                            struct snd_info_buffer *buffer)
{
      int minor;
      struct snd_minor *mptr;

      mutex_lock(&sound_oss_mutex);
      for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
            if (!(mptr = snd_oss_minors[minor]))
                  continue;
            if (mptr->card >= 0)
                  snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
                            mptr->card, mptr->device,
                            snd_oss_device_type_name(mptr->type));
            else
                  snd_iprintf(buffer, "%3i:       : %s\n", minor,
                            snd_oss_device_type_name(mptr->type));
      }
      mutex_unlock(&sound_oss_mutex);
}


int __init snd_minor_info_oss_init(void)
{
      struct snd_info_entry *entry;

      entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
      if (entry) {
            entry->c.text.read = snd_minor_info_oss_read;
            if (snd_info_register(entry) < 0) {
                  snd_info_free_entry(entry);
                  entry = NULL;
            }
      }
      snd_minor_info_oss_entry = entry;
      return 0;
}

int __exit snd_minor_info_oss_done(void)
{
      snd_info_free_entry(snd_minor_info_oss_entry);
      return 0;
}
#endif /* CONFIG_PROC_FS */

#endif /* CONFIG_SND_OSSEMUL */

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