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