linux/sound/core/sound_oss.c
<<
>>
Prefs
   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
  43/* NOTE: This function increments the refcount of the associated card like
  44 * snd_lookup_minor_data(); the caller must call snd_card_unref() appropriately
  45 */
  46void *snd_lookup_oss_minor_data(unsigned int minor, int type)
  47{
  48        struct snd_minor *mreg;
  49        void *private_data;
  50
  51        if (minor >= ARRAY_SIZE(snd_oss_minors))
  52                return NULL;
  53        mutex_lock(&sound_oss_mutex);
  54        mreg = snd_oss_minors[minor];
  55        if (mreg && mreg->type == type) {
  56                private_data = mreg->private_data;
  57                if (private_data && mreg->card_ptr)
  58                        atomic_inc(&mreg->card_ptr->refcount);
  59        } else
  60                private_data = NULL;
  61        mutex_unlock(&sound_oss_mutex);
  62        return private_data;
  63}
  64
  65EXPORT_SYMBOL(snd_lookup_oss_minor_data);
  66
  67static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
  68{
  69        int minor;
  70
  71        switch (type) {
  72        case SNDRV_OSS_DEVICE_TYPE_MIXER:
  73                if (snd_BUG_ON(!card || dev < 0 || dev > 1))
  74                        return -EINVAL;
  75                minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
  76                break;
  77        case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
  78                minor = SNDRV_MINOR_OSS_SEQUENCER;
  79                break;
  80        case SNDRV_OSS_DEVICE_TYPE_MUSIC:
  81                minor = SNDRV_MINOR_OSS_MUSIC;
  82                break;
  83        case SNDRV_OSS_DEVICE_TYPE_PCM:
  84                if (snd_BUG_ON(!card || dev < 0 || dev > 1))
  85                        return -EINVAL;
  86                minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
  87                break;
  88        case SNDRV_OSS_DEVICE_TYPE_MIDI:
  89                if (snd_BUG_ON(!card || dev < 0 || dev > 1))
  90                        return -EINVAL;
  91                minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
  92                break;
  93        case SNDRV_OSS_DEVICE_TYPE_DMFM:
  94                minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
  95                break;
  96        case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
  97                minor = SNDRV_MINOR_OSS_SNDSTAT;
  98                break;
  99        default:
 100                return -EINVAL;
 101        }
 102        if (minor < 0 || minor >= SNDRV_OSS_MINORS)
 103                return -EINVAL;
 104        return minor;
 105}
 106
 107int snd_register_oss_device(int type, struct snd_card *card, int dev,
 108                            const struct file_operations *f_ops, void *private_data,
 109                            const char *name)
 110{
 111        int minor = snd_oss_kernel_minor(type, card, dev);
 112        int minor_unit;
 113        struct snd_minor *preg;
 114        int cidx = SNDRV_MINOR_OSS_CARD(minor);
 115        int track2 = -1;
 116        int register1 = -1, register2 = -1;
 117        struct device *carddev = snd_card_get_device_link(card);
 118
 119        if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
 120                return 0; /* ignore silently */
 121        if (minor < 0)
 122                return minor;
 123        preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
 124        if (preg == NULL)
 125                return -ENOMEM;
 126        preg->type = type;
 127        preg->card = card ? card->number : -1;
 128        preg->device = dev;
 129        preg->f_ops = f_ops;
 130        preg->private_data = private_data;
 131        preg->card_ptr = card;
 132        mutex_lock(&sound_oss_mutex);
 133        snd_oss_minors[minor] = preg;
 134        minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
 135        switch (minor_unit) {
 136        case SNDRV_MINOR_OSS_PCM:
 137                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 138                break;
 139        case SNDRV_MINOR_OSS_MIDI:
 140                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 141                break;
 142        case SNDRV_MINOR_OSS_MIDI1:
 143                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 144                break;
 145        }
 146        register1 = register_sound_special_device(f_ops, minor, carddev);
 147        if (register1 != minor)
 148                goto __end;
 149        if (track2 >= 0) {
 150                register2 = register_sound_special_device(f_ops, track2,
 151                                                          carddev);
 152                if (register2 != track2)
 153                        goto __end;
 154                snd_oss_minors[track2] = preg;
 155        }
 156        mutex_unlock(&sound_oss_mutex);
 157        return 0;
 158
 159      __end:
 160        if (register2 >= 0)
 161                unregister_sound_special(register2);
 162        if (register1 >= 0)
 163                unregister_sound_special(register1);
 164        snd_oss_minors[minor] = NULL;
 165        mutex_unlock(&sound_oss_mutex);
 166        kfree(preg);
 167        return -EBUSY;
 168}
 169
 170EXPORT_SYMBOL(snd_register_oss_device);
 171
 172int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
 173{
 174        int minor = snd_oss_kernel_minor(type, card, dev);
 175        int cidx = SNDRV_MINOR_OSS_CARD(minor);
 176        int track2 = -1;
 177        struct snd_minor *mptr;
 178
 179        if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
 180                return 0;
 181        if (minor < 0)
 182                return minor;
 183        mutex_lock(&sound_oss_mutex);
 184        mptr = snd_oss_minors[minor];
 185        if (mptr == NULL) {
 186                mutex_unlock(&sound_oss_mutex);
 187                return -ENOENT;
 188        }
 189        unregister_sound_special(minor);
 190        switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
 191        case SNDRV_MINOR_OSS_PCM:
 192                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 193                break;
 194        case SNDRV_MINOR_OSS_MIDI:
 195                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 196                break;
 197        case SNDRV_MINOR_OSS_MIDI1:
 198                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 199                break;
 200        }
 201        if (track2 >= 0) {
 202                unregister_sound_special(track2);
 203                snd_oss_minors[track2] = NULL;
 204        }
 205        snd_oss_minors[minor] = NULL;
 206        mutex_unlock(&sound_oss_mutex);
 207        kfree(mptr);
 208        return 0;
 209}
 210
 211EXPORT_SYMBOL(snd_unregister_oss_device);
 212
 213/*
 214 *  INFO PART
 215 */
 216
 217#ifdef CONFIG_PROC_FS
 218
 219static struct snd_info_entry *snd_minor_info_oss_entry;
 220
 221static const char *snd_oss_device_type_name(int type)
 222{
 223        switch (type) {
 224        case SNDRV_OSS_DEVICE_TYPE_MIXER:
 225                return "mixer";
 226        case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
 227        case SNDRV_OSS_DEVICE_TYPE_MUSIC:
 228                return "sequencer";
 229        case SNDRV_OSS_DEVICE_TYPE_PCM:
 230                return "digital audio";
 231        case SNDRV_OSS_DEVICE_TYPE_MIDI:
 232                return "raw midi";
 233        case SNDRV_OSS_DEVICE_TYPE_DMFM:
 234                return "hardware dependent";
 235        default:
 236                return "?";
 237        }
 238}
 239
 240static void snd_minor_info_oss_read(struct snd_info_entry *entry,
 241                                    struct snd_info_buffer *buffer)
 242{
 243        int minor;
 244        struct snd_minor *mptr;
 245
 246        mutex_lock(&sound_oss_mutex);
 247        for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
 248                if (!(mptr = snd_oss_minors[minor]))
 249                        continue;
 250                if (mptr->card >= 0)
 251                        snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
 252                                    mptr->card, mptr->device,
 253                                    snd_oss_device_type_name(mptr->type));
 254                else
 255                        snd_iprintf(buffer, "%3i:       : %s\n", minor,
 256                                    snd_oss_device_type_name(mptr->type));
 257        }
 258        mutex_unlock(&sound_oss_mutex);
 259}
 260
 261
 262int __init snd_minor_info_oss_init(void)
 263{
 264        struct snd_info_entry *entry;
 265
 266        entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
 267        if (entry) {
 268                entry->c.text.read = snd_minor_info_oss_read;
 269                if (snd_info_register(entry) < 0) {
 270                        snd_info_free_entry(entry);
 271                        entry = NULL;
 272                }
 273        }
 274        snd_minor_info_oss_entry = entry;
 275        return 0;
 276}
 277
 278int __exit snd_minor_info_oss_done(void)
 279{
 280        snd_info_free_entry(snd_minor_info_oss_entry);
 281        return 0;
 282}
 283#endif /* CONFIG_PROC_FS */
 284
 285#endif /* CONFIG_SND_OSSEMUL */
 286
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.