release/src-rt-6.x.4708/linux/linux-2.6.36/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                 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
  68                         return -EINVAL;
  69                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
  70                 break;
  71         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
  72                 minor = SNDRV_MINOR_OSS_SEQUENCER;
  73                 break;
  74         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
  75                 minor = SNDRV_MINOR_OSS_MUSIC;
  76                 break;
  77         case SNDRV_OSS_DEVICE_TYPE_PCM:
  78                 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
  79                         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                 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
  84                         return -EINVAL;
  85                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
  86                 break;
  87         case SNDRV_OSS_DEVICE_TYPE_DMFM:
  88                 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
  89                 break;
  90         case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
  91                 minor = SNDRV_MINOR_OSS_SNDSTAT;
  92                 break;
  93         default:
  94                 return -EINVAL;
  95         }
  96         if (minor < 0 || minor >= SNDRV_OSS_MINORS)
  97                 return -EINVAL;
  98         return minor;
  99 }
 100
 101 int snd_register_oss_device(int type, struct snd_card *card, int dev,
 102                             const struct file_operations *f_ops, void *private_data,
 103                             const char *name)
 104 {
 105         int minor = snd_oss_kernel_minor(type, card, dev);
 106         int minor_unit;
 107         struct snd_minor *preg;
 108         int cidx = SNDRV_MINOR_OSS_CARD(minor);
 109         int track2 = -1;
 110         int register1 = -1, register2 = -1;
 111         struct device *carddev = snd_card_get_device_link(card);
 112
 113         if (card && card->number >= 8)
 114                 return 0; /* ignore silently */
 115         if (minor < 0)
 116                 return minor;
 117         preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
 118         if (preg == NULL)
 119                 return -ENOMEM;
 120         preg->type = type;
 121         preg->card = card ? card->number : -1;
 122         preg->device = dev;
 123         preg->f_ops = f_ops;
 124         preg->private_data = private_data;
 125         mutex_lock(&sound_oss_mutex);
 126         snd_oss_minors[minor] = preg;
 127         minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
 128         switch (minor_unit) {
 129         case SNDRV_MINOR_OSS_PCM:
 130                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 131                 break;
 132         case SNDRV_MINOR_OSS_MIDI:
 133                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 134                 break;
 135         case SNDRV_MINOR_OSS_MIDI1:
 136                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 137                 break;
 138         }
 139         register1 = register_sound_special_device(f_ops, minor, carddev);
 140         if (register1 != minor)
 141                 goto __end;
 142         if (track2 >= 0) {
 143                 register2 = register_sound_special_device(f_ops, track2,
 144                                                           carddev);
 145                 if (register2 != track2)
 146                         goto __end;
 147                 snd_oss_minors[track2] = preg;
 148         }
 149         mutex_unlock(&sound_oss_mutex);
 150         return 0;
 151
 152       __end:
 153         if (register2 >= 0)
 154                 unregister_sound_special(register2);
 155         if (register1 >= 0)
 156                 unregister_sound_special(register1);
 157         snd_oss_minors[minor] = NULL;
 158         mutex_unlock(&sound_oss_mutex);
 159         kfree(preg);
 160         return -EBUSY;
 161 }
 162
 163 EXPORT_SYMBOL(snd_register_oss_device);
 164
 165 int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
 166 {
 167         int minor = snd_oss_kernel_minor(type, card, dev);
 168         int cidx = SNDRV_MINOR_OSS_CARD(minor);
 169         int track2 = -1;
 170         struct snd_minor *mptr;
 171
 172         if (card && card->number >= 8)
 173                 return 0;
 174         if (minor < 0)
 175                 return minor;
 176         mutex_lock(&sound_oss_mutex);
 177         mptr = snd_oss_minors[minor];
 178         if (mptr == NULL) {
 179                 mutex_unlock(&sound_oss_mutex);
 180                 return -ENOENT;
 181         }
 182         unregister_sound_special(minor);
 183         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
 184         case SNDRV_MINOR_OSS_PCM:
 185                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 186                 break;
 187         case SNDRV_MINOR_OSS_MIDI:
 188                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 189                 break;
 190         case SNDRV_MINOR_OSS_MIDI1:
 191                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 192                 break;
 193         }
 194         if (track2 >= 0) {
 195                 unregister_sound_special(track2);
 196                 snd_oss_minors[track2] = NULL;
 197         }
 198         snd_oss_minors[minor] = NULL;
 199         mutex_unlock(&sound_oss_mutex);
 200         kfree(mptr);
 201         return 0;
 202 }
 203
 204 EXPORT_SYMBOL(snd_unregister_oss_device);
 205
 206 /*
 207  *  INFO PART
 208  */
 209
 210 #ifdef CONFIG_PROC_FS
 211
 212 static struct snd_info_entry *snd_minor_info_oss_entry;
 213
 214 static const char *snd_oss_device_type_name(int type)
 215 {
 216         switch (type) {
 217         case SNDRV_OSS_DEVICE_TYPE_MIXER:
 218                 return "mixer";
 219         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
 220         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
 221                 return "sequencer";
 222         case SNDRV_OSS_DEVICE_TYPE_PCM:
 223                 return "digital audio";
 224         case SNDRV_OSS_DEVICE_TYPE_MIDI:
 225                 return "raw midi";
 226         case SNDRV_OSS_DEVICE_TYPE_DMFM:
 227                 return "hardware dependent";
 228         default:
 229                 return "?";
 230         }
 231 }
 232
 233 static void snd_minor_info_oss_read(struct snd_info_entry *entry,
 234                                     struct snd_info_buffer *buffer)
 235 {
 236         int minor;
 237         struct snd_minor *mptr;
 238
 239         mutex_lock(&sound_oss_mutex);
 240         for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
 241                 if (!(mptr = snd_oss_minors[minor]))
 242                         continue;
 243                 if (mptr->card >= 0)
 244                         snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
 245                                     mptr->card, mptr->device,
 246                                     snd_oss_device_type_name(mptr->type));
 247                 else
 248                         snd_iprintf(buffer, "%3i:       : %s\n", minor,
 249                                     snd_oss_device_type_name(mptr->type));
 250         }
 251         mutex_unlock(&sound_oss_mutex);
 252 }
 253
 254
 255 int __init snd_minor_info_oss_init(void)
 256 {
 257         struct snd_info_entry *entry;
 258
 259         entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
 260         if (entry) {
 261                 entry->c.text.read = snd_minor_info_oss_read;
 262                 if (snd_info_register(entry) < 0) {
 263                         snd_info_free_entry(entry);
 264                         entry = NULL;
 265                 }
 266         }
 267         snd_minor_info_oss_entry = entry;
 268         return 0;
 269 }
 270
 271 int __exit snd_minor_info_oss_done(void)
 272 {
 273         snd_info_free_entry(snd_minor_info_oss_entry);
 274         return 0;
 275 }
 276 #endif /* CONFIG_PROC_FS */
 277
 278 #endif /* CONFIG_SND_OSSEMUL */