linux/sound/core/sound_oss.c
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   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/export.h>
  30#include <linux/slab.h>
  31#include <linux/time.h>
  32#include <sound/core.h>
  33#include <sound/minors.h>
  34#include <sound/info.h>
  35#include <linux/sound.h>
  36#include <linux/mutex.h>
  37
  38#define SNDRV_OSS_MINORS 256
  39
  40static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
  41static DEFINE_MUTEX(sound_oss_mutex);
  42
  43void *snd_lookup_oss_minor_data(unsigned int minor, int type)
  44{
  45        struct snd_minor *mreg;
  46        void *private_data;
  47
  48        if (minor >= ARRAY_SIZE(snd_oss_minors))
  49                return NULL;
  50        mutex_lock(&sound_oss_mutex);
  51        mreg = snd_oss_minors[minor];
  52        if (mreg && mreg->type == type)
  53                private_data = mreg->private_data;
  54        else
  55                private_data = NULL;
  56        mutex_unlock(&sound_oss_mutex);
  57        return private_data;
  58}
  59
  60EXPORT_SYMBOL(snd_lookup_oss_minor_data);
  61
  62static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
  63{
  64        int minor;
  65
  66        switch (type) {
  67        case SNDRV_OSS_DEVICE_TYPE_MIXER:
  68                if (snd_BUG_ON(!card || dev < 0 || dev > 1))
  69                        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                if (snd_BUG_ON(!card || dev < 0 || dev > 1))
  80                        return -EINVAL;
  81                minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
  82                break;
  83        case SNDRV_OSS_DEVICE_TYPE_MIDI:
  84                if (snd_BUG_ON(!card || dev < 0 || dev > 1))
  85                        return -EINVAL;
  86                minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
  87                break;
  88        case SNDRV_OSS_DEVICE_TYPE_DMFM:
  89                minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
  90                break;
  91        case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
  92                minor = SNDRV_MINOR_OSS_SNDSTAT;
  93                break;
  94        default:
  95                return -EINVAL;
  96        }
  97        if (minor < 0 || minor >= SNDRV_OSS_MINORS)
  98                return -EINVAL;
  99        return minor;
 100}
 101
 102int snd_register_oss_device(int type, struct snd_card *card, int dev,
 103                            const struct file_operations *f_ops, void *private_data,
 104                            const char *name)
 105{
 106        int minor = snd_oss_kernel_minor(type, card, dev);
 107        int minor_unit;
 108        struct snd_minor *preg;
 109        int cidx = SNDRV_MINOR_OSS_CARD(minor);
 110        int track2 = -1;
 111        int register1 = -1, register2 = -1;
 112        struct device *carddev = snd_card_get_device_link(card);
 113
 114        if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
 115                return 0; /* ignore silently */
 116        if (minor < 0)
 117                return minor;
 118        preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
 119        if (preg == NULL)
 120                return -ENOMEM;
 121        preg->type = type;
 122        preg->card = card ? card->number : -1;
 123        preg->device = dev;
 124        preg->f_ops = f_ops;
 125        preg->private_data = private_data;
 126        mutex_lock(&sound_oss_mutex);
 127        snd_oss_minors[minor] = preg;
 128        minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
 129        switch (minor_unit) {
 130        case SNDRV_MINOR_OSS_PCM:
 131                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 132                break;
 133        case SNDRV_MINOR_OSS_MIDI:
 134                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 135                break;
 136        case SNDRV_MINOR_OSS_MIDI1:
 137                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 138                break;
 139        }
 140        register1 = register_sound_special_device(f_ops, minor, carddev);
 141        if (register1 != minor)
 142                goto __end;
 143        if (track2 >= 0) {
 144                register2 = register_sound_special_device(f_ops, track2,
 145                                                          carddev);
 146                if (register2 != track2)
 147                        goto __end;
 148                snd_oss_minors[track2] = preg;
 149        }
 150        mutex_unlock(&sound_oss_mutex);
 151        return 0;
 152
 153      __end:
 154        if (register2 >= 0)
 155                unregister_sound_special(register2);
 156        if (register1 >= 0)
 157                unregister_sound_special(register1);
 158        snd_oss_minors[minor] = NULL;
 159        mutex_unlock(&sound_oss_mutex);
 160        kfree(preg);
 161        return -EBUSY;
 162}
 163
 164EXPORT_SYMBOL(snd_register_oss_device);
 165
 166int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
 167{
 168        int minor = snd_oss_kernel_minor(type, card, dev);
 169        int cidx = SNDRV_MINOR_OSS_CARD(minor);
 170        int track2 = -1;
 171        struct snd_minor *mptr;
 172
 173        if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
 174                return 0;
 175        if (minor < 0)
 176                return minor;
 177        mutex_lock(&sound_oss_mutex);
 178        mptr = snd_oss_minors[minor];
 179        if (mptr == NULL) {
 180                mutex_unlock(&sound_oss_mutex);
 181                return -ENOENT;
 182        }
 183        unregister_sound_special(minor);
 184        switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
 185        case SNDRV_MINOR_OSS_PCM:
 186                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 187                break;
 188        case SNDRV_MINOR_OSS_MIDI:
 189                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 190                break;
 191        case SNDRV_MINOR_OSS_MIDI1:
 192                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 193                break;
 194        }
 195        if (track2 >= 0) {
 196                unregister_sound_special(track2);
 197                snd_oss_minors[track2] = NULL;
 198        }
 199        snd_oss_minors[minor] = NULL;
 200        mutex_unlock(&sound_oss_mutex);
 201        kfree(mptr);
 202        return 0;
 203}
 204
 205EXPORT_SYMBOL(snd_unregister_oss_device);
 206
 207/*
 208 *  INFO PART
 209 */
 210
 211#ifdef CONFIG_PROC_FS
 212
 213static struct snd_info_entry *snd_minor_info_oss_entry;
 214
 215static const char *snd_oss_device_type_name(int type)
 216{
 217        switch (type) {
 218        case SNDRV_OSS_DEVICE_TYPE_MIXER:
 219                return "mixer";
 220        case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
 221        case SNDRV_OSS_DEVICE_TYPE_MUSIC:
 222                return "sequencer";
 223        case SNDRV_OSS_DEVICE_TYPE_PCM:
 224                return "digital audio";
 225        case SNDRV_OSS_DEVICE_TYPE_MIDI:
 226                return "raw midi";
 227        case SNDRV_OSS_DEVICE_TYPE_DMFM:
 228                return "hardware dependent";
 229        default:
 230                return "?";
 231        }
 232}
 233
 234static void snd_minor_info_oss_read(struct snd_info_entry *entry,
 235                                    struct snd_info_buffer *buffer)
 236{
 237        int minor;
 238        struct snd_minor *mptr;
 239
 240        mutex_lock(&sound_oss_mutex);
 241        for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
 242                if (!(mptr = snd_oss_minors[minor]))
 243                        continue;
 244                if (mptr->card >= 0)
 245                        snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
 246                                    mptr->card, mptr->device,
 247                                    snd_oss_device_type_name(mptr->type));
 248                else
 249                        snd_iprintf(buffer, "%3i:       : %s\n", minor,
 250                                    snd_oss_device_type_name(mptr->type));
 251        }
 252        mutex_unlock(&sound_oss_mutex);
 253}
 254
 255
 256int __init snd_minor_info_oss_init(void)
 257{
 258        struct snd_info_entry *entry;
 259
 260        entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
 261        if (entry) {
 262                entry->c.text.read = snd_minor_info_oss_read;
 263                if (snd_info_register(entry) < 0) {
 264                        snd_info_free_entry(entry);
 265                        entry = NULL;
 266                }
 267        }
 268        snd_minor_info_oss_entry = entry;
 269        return 0;
 270}
 271
 272int __exit snd_minor_info_oss_done(void)
 273{
 274        snd_info_free_entry(snd_minor_info_oss_entry);
 275        return 0;
 276}
 277#endif /* CONFIG_PROC_FS */
 278
 279#endif /* CONFIG_SND_OSSEMUL */
 280
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