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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>

#define SNDRV_OS_MINORS       256

static struct list_head snd_oss_minors_hash[SNDRV_CARDS];

static DECLARE_MUTEX(sound_oss_mutex);

static snd_minor_t *snd_oss_minor_search(int minor)
{
      struct list_head *list;
      snd_minor_t *mptr;

      list_for_each(list, &snd_oss_minors_hash[SNDRV_MINOR_OSS_CARD(minor)]) {
            mptr = list_entry(list, snd_minor_t, list);
            if (mptr->number == minor)
                  return mptr;
      }
      return NULL;
}

static int snd_oss_kernel_minor(int type, snd_card_t * 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_OS_MINORS, return -EINVAL);
      return minor;
}

int snd_register_oss_device(int type, snd_card_t * card, int dev, snd_minor_t * reg, const char *name)
{
      int minor = snd_oss_kernel_minor(type, card, dev);
      int minor_unit;
      snd_minor_t *preg;
      int cidx = SNDRV_MINOR_OSS_CARD(minor);
      int track2 = -1;
      int register1 = -1, register2 = -1;
      struct device *carddev = NULL;

      if (minor < 0)
            return minor;
      preg = (snd_minor_t *)kmalloc(sizeof(snd_minor_t), GFP_KERNEL);
      if (preg == NULL)
            return -ENOMEM;
      *preg = *reg;
      preg->number = minor;
      preg->device = dev;
      down(&sound_oss_mutex);
      list_add_tail(&preg->list, &snd_oss_minors_hash[cidx]);
      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(reg->f_ops, minor, carddev);
      if (register1 != minor)
            goto __end;
      if (track2 >= 0) {
            register2 = register_sound_special_device(reg->f_ops, track2, carddev);
            if (register2 != track2)
                  goto __end;
      }
      up(&sound_oss_mutex);
      return 0;

      __end:
            if (register2 >= 0)
                  unregister_sound_special(register2);
            if (register1 >= 0)
                  unregister_sound_special(register1);
            list_del(&preg->list);
      up(&sound_oss_mutex);
      kfree(preg);
            return -EBUSY;
}

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

      if (minor < 0)
            return minor;
      down(&sound_oss_mutex);
      mptr = snd_oss_minor_search(minor);
      if (mptr == NULL) {
            up(&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);
      list_del(&mptr->list);
      up(&sound_oss_mutex);
      kfree(mptr);
      return 0;
}

/*
 *  INFO PART
 */

#ifdef CONFIG_PROC_FS

static snd_info_entry_t *snd_minor_info_oss_entry = NULL;

static void snd_minor_info_oss_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
{
      int card, dev;
      struct list_head *list;
      snd_minor_t *mptr;

      down(&sound_oss_mutex);
      for (card = 0; card < SNDRV_CARDS; card++) {
            list_for_each(list, &snd_oss_minors_hash[card]) {
                  mptr = list_entry(list, snd_minor_t, list);
                  dev = SNDRV_MINOR_OSS_DEVICE(mptr->number);
                    if (dev != SNDRV_MINOR_OSS_SNDSTAT &&
                      dev != SNDRV_MINOR_OSS_SEQUENCER &&
                      dev != SNDRV_MINOR_OSS_MUSIC)
                        snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, dev, mptr->comment);
                  else
                        snd_iprintf(buffer, "%3i:       : %s\n", mptr->number, mptr->comment);
            }
      }
      up(&sound_oss_mutex);
}

#endif /* CONFIG_PROC_FS */

int __init snd_minor_info_oss_init(void)
{
#ifdef CONFIG_PROC_FS
      snd_info_entry_t *entry;

      entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
      if (entry) {
            entry->c.text.read_size = PAGE_SIZE;
            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;
#endif
      return 0;
}

int __exit snd_minor_info_oss_done(void)
{
#ifdef CONFIG_PROC_FS
      if (snd_minor_info_oss_entry)
            snd_info_unregister(snd_minor_info_oss_entry);
#endif
      return 0;
}

int __init snd_oss_init_module(void)
{
      int card;
      
      for (card = 0; card < SNDRV_CARDS; card++)
            INIT_LIST_HEAD(&snd_oss_minors_hash[card]);
      return 0;
}

#endif /* CONFIG_SND_OSSEMUL */

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