LXR linux/sound/core/sound

   1/*
   2 *  Advanced Linux Sound Architecture
   3 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4 *
   5 *
   6 *   This program is free software; you can redistribute it and/or modify
   7 *   it under the terms of the GNU General Public License as published by
   8 *   the Free Software Foundation; either version 2 of the License, or
   9 *   (at your option) any later version.
  10 *
  11 *   This program is distributed in the hope that it will be useful,
  12 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 *   GNU General Public License for more details.
  15 *
  16 *   You should have received a copy of the GNU General Public License
  17 *   along with this program; if not, write to the Free Software
  18 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19 *
  20 */
  21
  22#include <sound/driver.h>
  23
  24#ifdef CONFIG_SND_OSSEMUL
  25
  26#if !defined(CONFIG_SOUND) && !(defined(MODULE) && defined(CONFIG_SOUND_MODULE))
  27#error "Enable the OSS soundcore multiplexer (CONFIG_SOUND) in the kernel."
  28#endif
  29
  30#include <linux/init.h>
  31#include <linux/slab.h>
  32#include <linux/time.h>
  33#include <sound/core.h>
  34#include <sound/minors.h>
  35#include <sound/info.h>
  36#include <linux/sound.h>
  37#include <linux/mutex.h>
  38
  39#define SNDRV_OSS_MINORS 128
  40
  41static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
  42static DEFINE_MUTEX(sound_oss_mutex);
  43
  44void *snd_lookup_oss_minor_data(unsigned int minor, int type)
  45{
  46        struct snd_minor *mreg;
  47        void *private_data;
  48
  49        if (minor >= ARRAY_SIZE(snd_oss_minors))
  50                return NULL;
  51        mutex_lock(&sound_oss_mutex);
  52        mreg = snd_oss_minors[minor];
  53        if (mreg && mreg->type == type)
  54                private_data = mreg->private_data;
  55        else
  56                private_data = NULL;
  57        mutex_unlock(&sound_oss_mutex);
  58        return private_data;
  59}
  60
  61EXPORT_SYMBOL(snd_lookup_oss_minor_data);
  62
  63static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
  64{
  65        int minor;
  66
  67        switch (type) {
  68        case SNDRV_OSS_DEVICE_TYPE_MIXER:
  69                snd_assert(card != NULL && dev <= 1, return -EINVAL);
  70                minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
  71                break;
  72        case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
  73                minor = SNDRV_MINOR_OSS_SEQUENCER;
  74                break;
  75        case SNDRV_OSS_DEVICE_TYPE_MUSIC:
  76                minor = SNDRV_MINOR_OSS_MUSIC;
  77                break;
  78        case SNDRV_OSS_DEVICE_TYPE_PCM:
  79                snd_assert(card != NULL && dev <= 1, return -EINVAL);
  80                minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
  81                break;
  82        case SNDRV_OSS_DEVICE_TYPE_MIDI:
  83                snd_assert(card != NULL && dev <= 1, return -EINVAL);
  84                minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
  85                break;
  86        case SNDRV_OSS_DEVICE_TYPE_DMFM:
  87                minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
  88                break;
  89        case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
  90                minor = SNDRV_MINOR_OSS_SNDSTAT;
  91                break;
  92        default:
  93                return -EINVAL;
  94        }
  95        snd_assert(minor >= 0 && minor < SNDRV_OSS_MINORS, return -EINVAL);
  96        return minor;
  97}
  98
  99int snd_register_oss_device(int type, struct snd_card *card, int dev,
 100                            const struct file_operations *f_ops, void *private_data,
 101                            const char *name)
 102{
 103        int minor = snd_oss_kernel_minor(type, card, dev);
 104        int minor_unit;
 105        struct snd_minor *preg;
 106        int cidx = SNDRV_MINOR_OSS_CARD(minor);
 107        int track2 = -1;
 108        int register1 = -1, register2 = -1;
 109        struct device *carddev = snd_card_get_device_link(card);
 110
 111        if (card && card->number >= 8)
 112                return 0; /* ignore silently */
 113        if (minor < 0)
 114                return minor;
 115        preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
 116        if (preg == NULL)
 117                return -ENOMEM;
 118        preg->type = type;
 119        preg->card = card ? card->number : -1;
 120        preg->device = dev;
 121        preg->f_ops = f_ops;
 122        preg->private_data = private_data;
 123        mutex_lock(&sound_oss_mutex);
 124        snd_oss_minors[minor] = preg;
 125        minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
 126        switch (minor_unit) {
 127        case SNDRV_MINOR_OSS_PCM:
 128                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 129                break;
 130        case SNDRV_MINOR_OSS_MIDI:
 131                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 132                break;
 133        case SNDRV_MINOR_OSS_MIDI1:
 134                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 135                break;
 136        }
 137        register1 = register_sound_special_device(f_ops, minor, carddev);
 138        if (register1 != minor)
 139                goto __end;
 140        if (track2 >= 0) {
 141                register2 = register_sound_special_device(f_ops, track2,
 142                                                          carddev);
 143                if (register2 != track2)
 144                        goto __end;
 145                snd_oss_minors[track2] = preg;
 146        }
 147        mutex_unlock(&sound_oss_mutex);
 148        return 0;
 149
 150      __end:
 151        if (register2 >= 0)
 152                unregister_sound_special(register2);
 153        if (register1 >= 0)
 154                unregister_sound_special(register1);
 155        snd_oss_minors[minor] = NULL;
 156        mutex_unlock(&sound_oss_mutex);
 157        kfree(preg);
 158        return -EBUSY;
 159}
 160
 161EXPORT_SYMBOL(snd_register_oss_device);
 162
 163int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
 164{
 165        int minor = snd_oss_kernel_minor(type, card, dev);
 166        int cidx = SNDRV_MINOR_OSS_CARD(minor);
 167        int track2 = -1;
 168        struct snd_minor *mptr;
 169
 170        if (card && card->number >= 8)
 171                return 0;
 172        if (minor < 0)
 173                return minor;
 174        mutex_lock(&sound_oss_mutex);
 175        mptr = snd_oss_minors[minor];
 176        if (mptr == NULL) {
 177                mutex_unlock(&sound_oss_mutex);
 178                return -ENOENT;
 179        }
 180        unregister_sound_special(minor);
 181        switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
 182        case SNDRV_MINOR_OSS_PCM:
 183                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 184                break;
 185        case SNDRV_MINOR_OSS_MIDI:
 186                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 187                break;
 188        case SNDRV_MINOR_OSS_MIDI1:
 189                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 190                break;
 191        }
 192        if (track2 >= 0) {
 193                unregister_sound_special(track2);
 194                snd_oss_minors[track2] = NULL;
 195        }
 196        snd_oss_minors[minor] = NULL;
 197        mutex_unlock(&sound_oss_mutex);
 198        kfree(mptr);
 199        return 0;
 200}
 201
 202EXPORT_SYMBOL(snd_unregister_oss_device);
 203
 204/*
 205 *  INFO PART
 206 */
 207
 208#ifdef CONFIG_PROC_FS
 209
 210static struct snd_info_entry *snd_minor_info_oss_entry;
 211
 212static const char *snd_oss_device_type_name(int type)
 213{
 214        switch (type) {
 215        case SNDRV_OSS_DEVICE_TYPE_MIXER:
 216                return "mixer";
 217        case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
 218        case SNDRV_OSS_DEVICE_TYPE_MUSIC:
 219                return "sequencer";
 220        case SNDRV_OSS_DEVICE_TYPE_PCM:
 221                return "digital audio";
 222        case SNDRV_OSS_DEVICE_TYPE_MIDI:
 223                return "raw midi";
 224        case SNDRV_OSS_DEVICE_TYPE_DMFM:
 225                return "hardware dependent";
 226        default:
 227                return "?";
 228        }
 229}
 230
 231static void snd_minor_info_oss_read(struct snd_info_entry *entry,
 232                                    struct snd_info_buffer *buffer)
 233{
 234        int minor;
 235        struct snd_minor *mptr;
 236
 237        mutex_lock(&sound_oss_mutex);
 238        for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
 239                if (!(mptr = snd_oss_minors[minor]))
 240                        continue;
 241                if (mptr->card >= 0)
 242                        snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
 243                                    mptr->card, mptr->device,
 244                                    snd_oss_device_type_name(mptr->type));
 245                else
 246                        snd_iprintf(buffer, "%3i:       : %s\n", minor,
 247                                    snd_oss_device_type_name(mptr->type));
 248        }
 249        mutex_unlock(&sound_oss_mutex);
 250}
 251
 252
 253int __init snd_minor_info_oss_init(void)
 254{
 255        struct snd_info_entry *entry;
 256
 257        entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
 258        if (entry) {
 259                entry->c.text.read = snd_minor_info_oss_read;
 260                if (snd_info_register(entry) < 0) {
 261                        snd_info_free_entry(entry);
 262                        entry = NULL;
 263                }
 264        }
 265        snd_minor_info_oss_entry = entry;
 266        return 0;
 267}
 268
 269int __exit snd_minor_info_oss_done(void)
 270{
 271        snd_info_free_entry(snd_minor_info_oss_entry);
 272        return 0;
 273}
 274#endif /* CONFIG_PROC_FS */
 275
 276#endif /* CONFIG_SND_OSSEMUL */
 277