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 128
  39
  40 static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
  41 static DEFINE_MUTEX(sound_oss_mutex);
  42
  43 void *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
  60 EXPORT_SYMBOL(snd_lookup_oss_minor_data);
  61
  62 static 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
 102 int 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 >= 8)
 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
 164 EXPORT_SYMBOL(snd_register_oss_device);
 165
 166 int 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 >= 8)
 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
 205 EXPORT_SYMBOL(snd_unregister_oss_device);
 206
 207 /*
 208  *  INFO PART
 209  */
 210
 211 #ifdef CONFIG_PROC_FS
 212
 213 static struct snd_info_entry *snd_minor_info_oss_entry;
 214
 215 static 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
 234 static 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
 256 int __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
 272 int __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 */