sound/core/sound_oss.c

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