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#ifdef CONFIG_SND_OSSEMUL
  23
  24#if !defined(CONFIG_SOUND) && !(defined(MODULE) && defined(CONFIG_SOUND_MODULE))
  25#error "Enable the OSS soundcore multiplexer (CONFIG_SOUND) in the kernel."
  26#endif
  27
  28#include <linux/init.h>
  29#include <linux/slab.h>
  30#include <linux/time.h>
  31#include <sound/core.h>
  32#include <sound/minors.h>
  33#include <sound/info.h>
  34#include <linux/sound.h>
  35#include <linux/mutex.h>
  36
  37#define SNDRV_OSS_MINORS 128
  38
  39static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
  40static DEFINE_MUTEX(sound_oss_mutex);
  41
  42void *snd_lookup_oss_minor_data(unsigned int minor, int type)
  43{
  44        struct snd_minor *mreg;
  45        void *private_data;
  46
  47        if (minor >= ARRAY_SIZE(snd_oss_minors))
  48                return NULL;
  49        mutex_lock(&sound_oss_mutex);
  50        mreg = snd_oss_minors[minor];
  51        if (mreg && mreg->type == type)
  52                private_data = mreg->private_data;
  53        else
  54                private_data = NULL;
  55        mutex_unlock(&sound_oss_mutex);
  56        return private_data;
  57}
  58
  59EXPORT_SYMBOL(snd_lookup_oss_minor_data);
  60
  61static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
  62{
  63        int minor;
  64
  65        switch (type) {
  66        case SNDRV_OSS_DEVICE_TYPE_MIXER:
  67                snd_assert(card != NULL && dev <= 1, return -EINVAL);
  68                minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
  69                break;
  70        case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
  71                minor = SNDRV_MINOR_OSS_SEQUENCER;
  72                break;
  73        case SNDRV_OSS_DEVICE_TYPE_MUSIC:
  74                minor = SNDRV_MINOR_OSS_MUSIC;
  75                break;
  76        case SNDRV_OSS_DEVICE_TYPE_PCM:
  77                snd_assert(card != NULL && dev <= 1, return -EINVAL);
  78                minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
  79                break;
  80        case SNDRV_OSS_DEVICE_TYPE_MIDI:
  81                snd_assert(card != NULL && dev <= 1, return -EINVAL);
  82                minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
  83                break;
  84        case SNDRV_OSS_DEVICE_TYPE_DMFM:
  85                minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
  86                break;
  87        case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
  88                minor = SNDRV_MINOR_OSS_SNDSTAT;
  89                break;
  90        default:
  91                return -EINVAL;
  92        }
  93        snd_assert(minor >= 0 && minor < SNDRV_OSS_MINORS, return -EINVAL);
  94        return minor;
  95}
  96
  97int snd_register_oss_device(int type, struct snd_card *card, int dev,
  98                            const struct file_operations *f_ops, void *private_data,
  99                            const char *name)
 100{
 101        int minor = snd_oss_kernel_minor(type, card, dev);
 102        int minor_unit;
 103        struct snd_minor *preg;
 104        int cidx = SNDRV_MINOR_OSS_CARD(minor);
 105        int track2 = -1;
 106        int register1 = -1, register2 = -1;
 107        struct device *carddev = snd_card_get_device_link(card);
 108
 109        if (card && card->number >= 8)
 110                return 0; /* ignore silently */
 111        if (minor < 0)
 112                return minor;
 113        preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
 114        if (preg == NULL)
 115                return -ENOMEM;
 116        preg->type = type;
 117        preg->card = card ? card->number : -1;
 118        preg->device = dev;
 119        preg->f_ops = f_ops;
 120        preg->private_data = private_data;
 121        mutex_lock(&sound_oss_mutex);
 122        snd_oss_minors[minor] = preg;
 123        minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
 124        switch (minor_unit) {
 125        case SNDRV_MINOR_OSS_PCM:
 126                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 127                break;
 128        case SNDRV_MINOR_OSS_MIDI:
 129                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 130                break;
 131        case SNDRV_MINOR_OSS_MIDI1:
 132                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 133                break;
 134        }
 135        register1 = register_sound_special_device(f_ops, minor, carddev);
 136        if (register1 != minor)
 137                goto __end;
 138        if (track2 >= 0) {
 139                register2 = register_sound_special_device(f_ops, track2,
 140                                                          carddev);
 141                if (register2 != track2)
 142                        goto __end;
 143                snd_oss_minors[track2] = preg;
 144        }
 145        mutex_unlock(&sound_oss_mutex);
 146        return 0;
 147
 148      __end:
 149        if (register2 >= 0)
 150                unregister_sound_special(register2);
 151        if (register1 >= 0)
 152                unregister_sound_special(register1);
 153        snd_oss_minors[minor] = NULL;
 154        mutex_unlock(&sound_oss_mutex);
 155        kfree(preg);
 156        return -EBUSY;
 157}
 158
 159EXPORT_SYMBOL(snd_register_oss_device);
 160
 161int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
 162{
 163        int minor = snd_oss_kernel_minor(type, card, dev);
 164        int cidx = SNDRV_MINOR_OSS_CARD(minor);
 165        int track2 = -1;
 166        struct snd_minor *mptr;
 167
 168        if (card && card->number >= 8)
 169                return 0;
 170        if (minor < 0)
 171                return minor;
 172        mutex_lock(&sound_oss_mutex);
 173        mptr = snd_oss_minors[minor];
 174        if (mptr == NULL) {
 175                mutex_unlock(&sound_oss_mutex);
 176                return -ENOENT;
 177        }
 178        unregister_sound_special(minor);
 179        switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
 180        case SNDRV_MINOR_OSS_PCM:
 181                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 182                break;
 183        case SNDRV_MINOR_OSS_MIDI:
 184                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 185                break;
 186        case SNDRV_MINOR_OSS_MIDI1:
 187                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 188                break;
 189        }
 190        if (track2 >= 0) {
 191                unregister_sound_special(track2);
 192                snd_oss_minors[track2] = NULL;
 193        }
 194        snd_oss_minors[minor] = NULL;
 195        mutex_unlock(&sound_oss_mutex);
 196        kfree(mptr);
 197        return 0;
 198}
 199
 200EXPORT_SYMBOL(snd_unregister_oss_device);
 201
 202/*
 203 *  INFO PART
 204 */
 205
 206#ifdef CONFIG_PROC_FS
 207
 208static struct snd_info_entry *snd_minor_info_oss_entry;
 209
 210static const char *snd_oss_device_type_name(int type)
 211{
 212        switch (type) {
 213        case SNDRV_OSS_DEVICE_TYPE_MIXER:
 214                return "mixer";
 215        case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
 216        case SNDRV_OSS_DEVICE_TYPE_MUSIC:
 217                return "sequencer";
 218        case SNDRV_OSS_DEVICE_TYPE_PCM:
 219                return "digital audio";
 220        case SNDRV_OSS_DEVICE_TYPE_MIDI:
 221                return "raw midi";
 222        case SNDRV_OSS_DEVICE_TYPE_DMFM:
 223                return "hardware dependent";
 224        default:
 225                return "?";
 226        }
 227}
 228
 229static void snd_minor_info_oss_read(struct snd_info_entry *entry,
 230                                    struct snd_info_buffer *buffer)
 231{
 232        int minor;
 233        struct snd_minor *mptr;
 234
 235        mutex_lock(&sound_oss_mutex);
 236        for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
 237                if (!(mptr = snd_oss_minors[minor]))
 238                        continue;
 239                if (mptr->card >= 0)
 240                        snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
 241                                    mptr->card, mptr->device,
 242                                    snd_oss_device_type_name(mptr->type));
 243                else
 244                        snd_iprintf(buffer, "%3i:       : %s\n", minor,
 245                                    snd_oss_device_type_name(mptr->type));
 246        }
 247        mutex_unlock(&sound_oss_mutex);
 248}
 249
 250
 251int __init snd_minor_info_oss_init(void)
 252{
 253        struct snd_info_entry *entry;
 254
 255        entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
 256        if (entry) {
 257                entry->c.text.read = snd_minor_info_oss_read;
 258                if (snd_info_register(entry) < 0) {
 259                        snd_info_free_entry(entry);
 260                        entry = NULL;
 261                }
 262        }
 263        snd_minor_info_oss_entry = entry;
 264        return 0;
 265}
 266
 267int __exit snd_minor_info_oss_done(void)
 268{
 269        snd_info_free_entry(snd_minor_info_oss_entry);
 270        return 0;
 271}
 272#endif /* CONFIG_PROC_FS */
 273
 274#endif /* CONFIG_SND_OSSEMUL */
 275