sound/core/sound_oss.c

   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
  40 static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
  41 static 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  */
  46 void *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
  65 EXPORT_SYMBOL(snd_lookup_oss_minor_data);
  66
  67 static 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
 107 int 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
 170 EXPORT_SYMBOL(snd_register_oss_device);
 171
 172 int 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
 211 EXPORT_SYMBOL(snd_unregister_oss_device);
 212
 213 /*
 214  *  INFO PART
 215  */
 216
 217 #ifdef CONFIG_PROC_FS
 218
 219 static struct snd_info_entry *snd_minor_info_oss_entry;
 220
 221 static 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
 240 static 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
 262 int __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
 278 int __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 */