err.no Git - linux-2.6/blob - 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 (minor < 0)
 109                 return minor;
 110         preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
 111         if (preg == NULL)
 112                 return -ENOMEM;
 113         preg->type = type;
 114         preg->card = card ? card->number : -1;
 115         preg->device = dev;
 116         preg->f_ops = f_ops;
 117         preg->private_data = private_data;
 118         down(&sound_oss_mutex);
 119         snd_oss_minors[minor] = preg;
 120         minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
 121         switch (minor_unit) {
 122         case SNDRV_MINOR_OSS_PCM:
 123                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 124                 break;
 125         case SNDRV_MINOR_OSS_MIDI:
 126                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 127                 break;
 128         case SNDRV_MINOR_OSS_MIDI1:
 129                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 130                 break;
 131         }
 132         if (card)
 133                 carddev = card->dev;
 134         register1 = register_sound_special_device(f_ops, minor, carddev);
 135         if (register1 != minor)
 136                 goto __end;
 137         if (track2 >= 0) {
 138                 register2 = register_sound_special_device(f_ops, track2,
 139                                                           carddev);
 140                 if (register2 != track2)
 141                         goto __end;
 142                 snd_oss_minors[track2] = preg;
 143         }
 144         up(&sound_oss_mutex);
 145         return 0;
 146
 147       __end:
 148         if (register2 >= 0)
 149                 unregister_sound_special(register2);
 150         if (register1 >= 0)
 151                 unregister_sound_special(register1);
 152         snd_oss_minors[minor] = NULL;
 153         up(&sound_oss_mutex);
 154         kfree(preg);
 155         return -EBUSY;
 156 }
 157
 158 int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
 159 {
 160         int minor = snd_oss_kernel_minor(type, card, dev);
 161         int cidx = SNDRV_MINOR_OSS_CARD(minor);
 162         int track2 = -1;
 163         struct snd_minor *mptr;
 164
 165         if (minor < 0)
 166                 return minor;
 167         down(&sound_oss_mutex);
 168         mptr = snd_oss_minors[minor];
 169         if (mptr == NULL) {
 170                 up(&sound_oss_mutex);
 171                 return -ENOENT;
 172         }
 173         unregister_sound_special(minor);
 174         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
 175         case SNDRV_MINOR_OSS_PCM:
 176                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 177                 break;
 178         case SNDRV_MINOR_OSS_MIDI:
 179                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 180                 break;
 181         case SNDRV_MINOR_OSS_MIDI1:
 182                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 183                 break;
 184         }
 185         if (track2 >= 0) {
 186                 unregister_sound_special(track2);
 187                 snd_oss_minors[track2] = NULL;
 188         }
 189         snd_oss_minors[minor] = NULL;
 190         up(&sound_oss_mutex);
 191         kfree(mptr);
 192         return 0;
 193 }
 194
 195 /*
 196  *  INFO PART
 197  */
 198
 199 #ifdef CONFIG_PROC_FS
 200
 201 static struct snd_info_entry *snd_minor_info_oss_entry = NULL;
 202
 203 static const char *snd_oss_device_type_name(int type)
 204 {
 205         switch (type) {
 206         case SNDRV_OSS_DEVICE_TYPE_MIXER:
 207                 return "mixer";
 208         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
 209         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
 210                 return "sequencer";
 211         case SNDRV_OSS_DEVICE_TYPE_PCM:
 212                 return "digital audio";
 213         case SNDRV_OSS_DEVICE_TYPE_MIDI:
 214                 return "raw midi";
 215         case SNDRV_OSS_DEVICE_TYPE_DMFM:
 216                 return "hardware dependent";
 217         default:
 218                 return "?";
 219         }
 220 }
 221
 222 static void snd_minor_info_oss_read(struct snd_info_entry *entry,
 223                                     struct snd_info_buffer *buffer)
 224 {
 225         int minor;
 226         struct snd_minor *mptr;
 227
 228         down(&sound_oss_mutex);
 229         for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
 230                 if (!(mptr = snd_oss_minors[minor]))
 231                         continue;
 232                 if (mptr->card >= 0)
 233                         snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
 234                                     mptr->card, mptr->device,
 235                                     snd_oss_device_type_name(mptr->type));
 236                 else
 237                         snd_iprintf(buffer, "%3i:       : %s\n", minor,
 238                                     snd_oss_device_type_name(mptr->type));
 239         }
 240         up(&sound_oss_mutex);
 241 }
 242
 243 #endif /* CONFIG_PROC_FS */
 244
 245 int __init snd_minor_info_oss_init(void)
 246 {
 247 #ifdef CONFIG_PROC_FS
 248         struct snd_info_entry *entry;
 249
 250         entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
 251         if (entry) {
 252                 entry->c.text.read_size = PAGE_SIZE;
 253                 entry->c.text.read = snd_minor_info_oss_read;
 254                 if (snd_info_register(entry) < 0) {
 255                         snd_info_free_entry(entry);
 256                         entry = NULL;
 257                 }
 258         }
 259         snd_minor_info_oss_entry = entry;
 260 #endif
 261         return 0;
 262 }
 263
 264 int __exit snd_minor_info_oss_done(void)
 265 {
 266 #ifdef CONFIG_PROC_FS
 267         if (snd_minor_info_oss_entry)
 268                 snd_info_unregister(snd_minor_info_oss_entry);
 269 #endif
 270         return 0;
 271 }
 272
 273 #endif /* CONFIG_SND_OSSEMUL */