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/slab.h>
  30 #include <linux/time.h>
  31 #include <sound/core.h>
  32 #include <sound/minors.h>
  33 #include <sound/info.h>
  34 #include <linux/sound.h>
  35 #include <linux/mutex.h>
  36
  37 #define SNDRV_OSS_MINORS 128
  38
  39 static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
  40 static DEFINE_MUTEX(sound_oss_mutex);
  41
  42 void *snd_lookup_oss_minor_data(unsigned int minor, int type)
  43 {
  44         struct snd_minor *mreg;
  45         void *private_data;
  46
  47         if (minor >= ARRAY_SIZE(snd_oss_minors))
  48                 return NULL;
  49         mutex_lock(&sound_oss_mutex);
  50         mreg = snd_oss_minors[minor];
  51         if (mreg && mreg->type == type)
  52                 private_data = mreg->private_data;
  53         else
  54                 private_data = NULL;
  55         mutex_unlock(&sound_oss_mutex);
  56         return private_data;
  57 }
  58
  59 EXPORT_SYMBOL(snd_lookup_oss_minor_data);
  60
  61 static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
  62 {
  63         int minor;
  64
  65         switch (type) {
  66         case SNDRV_OSS_DEVICE_TYPE_MIXER:
  67                 snd_assert(card != NULL && dev <= 1, return -EINVAL);
  68                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
  69                 break;
  70         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
  71                 minor = SNDRV_MINOR_OSS_SEQUENCER;
  72                 break;
  73         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
  74                 minor = SNDRV_MINOR_OSS_MUSIC;
  75                 break;
  76         case SNDRV_OSS_DEVICE_TYPE_PCM:
  77                 snd_assert(card != NULL && dev <= 1, return -EINVAL);
  78                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
  79                 break;
  80         case SNDRV_OSS_DEVICE_TYPE_MIDI:
  81                 snd_assert(card != NULL && dev <= 1, return -EINVAL);
  82                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
  83                 break;
  84         case SNDRV_OSS_DEVICE_TYPE_DMFM:
  85                 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
  86                 break;
  87         case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
  88                 minor = SNDRV_MINOR_OSS_SNDSTAT;
  89                 break;
  90         default:
  91                 return -EINVAL;
  92         }
  93         snd_assert(minor >= 0 && minor < SNDRV_OSS_MINORS, return -EINVAL);
  94         return minor;
  95 }
  96
  97 int snd_register_oss_device(int type, struct snd_card *card, int dev,
  98                             const struct file_operations *f_ops, void *private_data,
  99                             const char *name)
 100 {
 101         int minor = snd_oss_kernel_minor(type, card, dev);
 102         int minor_unit;
 103         struct snd_minor *preg;
 104         int cidx = SNDRV_MINOR_OSS_CARD(minor);
 105         int track2 = -1;
 106         int register1 = -1, register2 = -1;
 107         struct device *carddev = snd_card_get_device_link(card);
 108
 109         if (card && card->number >= 8)
 110                 return 0; /* ignore silently */
 111         if (minor < 0)
 112                 return minor;
 113         preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
 114         if (preg == NULL)
 115                 return -ENOMEM;
 116         preg->type = type;
 117         preg->card = card ? card->number : -1;
 118         preg->device = dev;
 119         preg->f_ops = f_ops;
 120         preg->private_data = private_data;
 121         mutex_lock(&sound_oss_mutex);
 122         snd_oss_minors[minor] = preg;
 123         minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
 124         switch (minor_unit) {
 125         case SNDRV_MINOR_OSS_PCM:
 126                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 127                 break;
 128         case SNDRV_MINOR_OSS_MIDI:
 129                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 130                 break;
 131         case SNDRV_MINOR_OSS_MIDI1:
 132                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 133                 break;
 134         }
 135         register1 = register_sound_special_device(f_ops, minor, carddev);
 136         if (register1 != minor)
 137                 goto __end;
 138         if (track2 >= 0) {
 139                 register2 = register_sound_special_device(f_ops, track2,
 140                                                           carddev);
 141                 if (register2 != track2)
 142                         goto __end;
 143                 snd_oss_minors[track2] = preg;
 144         }
 145         mutex_unlock(&sound_oss_mutex);
 146         return 0;
 147
 148       __end:
 149         if (register2 >= 0)
 150                 unregister_sound_special(register2);
 151         if (register1 >= 0)
 152                 unregister_sound_special(register1);
 153         snd_oss_minors[minor] = NULL;
 154         mutex_unlock(&sound_oss_mutex);
 155         kfree(preg);
 156         return -EBUSY;
 157 }
 158
 159 EXPORT_SYMBOL(snd_register_oss_device);
 160
 161 int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
 162 {
 163         int minor = snd_oss_kernel_minor(type, card, dev);
 164         int cidx = SNDRV_MINOR_OSS_CARD(minor);
 165         int track2 = -1;
 166         struct snd_minor *mptr;
 167
 168         if (card && card->number >= 8)
 169                 return 0;
 170         if (minor < 0)
 171                 return minor;
 172         mutex_lock(&sound_oss_mutex);
 173         mptr = snd_oss_minors[minor];
 174         if (mptr == NULL) {
 175                 mutex_unlock(&sound_oss_mutex);
 176                 return -ENOENT;
 177         }
 178         unregister_sound_special(minor);
 179         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
 180         case SNDRV_MINOR_OSS_PCM:
 181                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 182                 break;
 183         case SNDRV_MINOR_OSS_MIDI:
 184                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 185                 break;
 186         case SNDRV_MINOR_OSS_MIDI1:
 187                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 188                 break;
 189         }
 190         if (track2 >= 0) {
 191                 unregister_sound_special(track2);
 192                 snd_oss_minors[track2] = NULL;
 193         }
 194         snd_oss_minors[minor] = NULL;
 195         mutex_unlock(&sound_oss_mutex);
 196         kfree(mptr);
 197         return 0;
 198 }
 199
 200 EXPORT_SYMBOL(snd_unregister_oss_device);
 201
 202 /*
 203  *  INFO PART
 204  */
 205
 206 #ifdef CONFIG_PROC_FS
 207
 208 static struct snd_info_entry *snd_minor_info_oss_entry;
 209
 210 static const char *snd_oss_device_type_name(int type)
 211 {
 212         switch (type) {
 213         case SNDRV_OSS_DEVICE_TYPE_MIXER:
 214                 return "mixer";
 215         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
 216         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
 217                 return "sequencer";
 218         case SNDRV_OSS_DEVICE_TYPE_PCM:
 219                 return "digital audio";
 220         case SNDRV_OSS_DEVICE_TYPE_MIDI:
 221                 return "raw midi";
 222         case SNDRV_OSS_DEVICE_TYPE_DMFM:
 223                 return "hardware dependent";
 224         default:
 225                 return "?";
 226         }
 227 }
 228
 229 static void snd_minor_info_oss_read(struct snd_info_entry *entry,
 230                                     struct snd_info_buffer *buffer)
 231 {
 232         int minor;
 233         struct snd_minor *mptr;
 234
 235         mutex_lock(&sound_oss_mutex);
 236         for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
 237                 if (!(mptr = snd_oss_minors[minor]))
 238                         continue;
 239                 if (mptr->card >= 0)
 240                         snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
 241                                     mptr->card, mptr->device,
 242                                     snd_oss_device_type_name(mptr->type));
 243                 else
 244                         snd_iprintf(buffer, "%3i:       : %s\n", minor,
 245                                     snd_oss_device_type_name(mptr->type));
 246         }
 247         mutex_unlock(&sound_oss_mutex);
 248 }
 249
 250
 251 int __init snd_minor_info_oss_init(void)
 252 {
 253         struct snd_info_entry *entry;
 254
 255         entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
 256         if (entry) {
 257                 entry->c.text.read = snd_minor_info_oss_read;
 258                 if (snd_info_register(entry) < 0) {
 259                         snd_info_free_entry(entry);
 260                         entry = NULL;
 261                 }
 262         }
 263         snd_minor_info_oss_entry = entry;
 264         return 0;
 265 }
 266
 267 int __exit snd_minor_info_oss_done(void)
 268 {
 269         snd_info_free_entry(snd_minor_info_oss_entry);
 270         return 0;
 271 }
 272 #endif /* CONFIG_PROC_FS */
 273
 274 #endif /* CONFIG_SND_OSSEMUL */