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_OS_MINORS         256
  39
  40 static struct list_head snd_oss_minors_hash[SNDRV_CARDS];
  41
  42 static DECLARE_MUTEX(sound_oss_mutex);
  43
  44 static struct snd_minor *snd_oss_minor_search(int minor)
  45 {
  46         struct list_head *list;
  47         struct snd_minor *mptr;
  48
  49         list_for_each(list, &snd_oss_minors_hash[SNDRV_MINOR_OSS_CARD(minor)]) {
  50                 mptr = list_entry(list, struct snd_minor, list);
  51                 if (mptr->number == minor)
  52                         return mptr;
  53         }
  54         return NULL;
  55 }
  56
  57 static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
  58 {
  59         int minor;
  60
  61         switch (type) {
  62         case SNDRV_OSS_DEVICE_TYPE_MIXER:
  63                 snd_assert(card != NULL && dev <= 1, return -EINVAL);
  64                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
  65                 break;
  66         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
  67                 minor = SNDRV_MINOR_OSS_SEQUENCER;
  68                 break;
  69         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
  70                 minor = SNDRV_MINOR_OSS_MUSIC;
  71                 break;
  72         case SNDRV_OSS_DEVICE_TYPE_PCM:
  73                 snd_assert(card != NULL && dev <= 1, return -EINVAL);
  74                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
  75                 break;
  76         case SNDRV_OSS_DEVICE_TYPE_MIDI:
  77                 snd_assert(card != NULL && dev <= 1, return -EINVAL);
  78                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
  79                 break;
  80         case SNDRV_OSS_DEVICE_TYPE_DMFM:
  81                 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
  82                 break;
  83         case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
  84                 minor = SNDRV_MINOR_OSS_SNDSTAT;
  85                 break;
  86         default:
  87                 return -EINVAL;
  88         }
  89         snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
  90         return minor;
  91 }
  92
  93 int snd_register_oss_device(int type, struct snd_card *card, int dev,
  94                             struct file_operations *f_ops, const char *name)
  95 {
  96         int minor = snd_oss_kernel_minor(type, card, dev);
  97         int minor_unit;
  98         struct snd_minor *preg;
  99         int cidx = SNDRV_MINOR_OSS_CARD(minor);
 100         int track2 = -1;
 101         int register1 = -1, register2 = -1;
 102         struct device *carddev = NULL;
 103
 104         if (minor < 0)
 105                 return minor;
 106         preg = kzalloc(sizeof(struct snd_minor), GFP_KERNEL);
 107         if (preg == NULL)
 108                 return -ENOMEM;
 109         preg->number = minor;
 110         preg->type = type;
 111         preg->device = dev;
 112         preg->f_ops = f_ops;
 113         down(&sound_oss_mutex);
 114         list_add_tail(&preg->list, &snd_oss_minors_hash[cidx]);
 115         minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
 116         switch (minor_unit) {
 117         case SNDRV_MINOR_OSS_PCM:
 118                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 119                 break;
 120         case SNDRV_MINOR_OSS_MIDI:
 121                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 122                 break;
 123         case SNDRV_MINOR_OSS_MIDI1:
 124                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 125                 break;
 126         }
 127         if (card)
 128                 carddev = card->dev;
 129         register1 = register_sound_special_device(f_ops, minor, carddev);
 130         if (register1 != minor)
 131                 goto __end;
 132         if (track2 >= 0) {
 133                 register2 = register_sound_special_device(f_ops, track2,
 134                                                           carddev);
 135                 if (register2 != track2)
 136                         goto __end;
 137         }
 138         up(&sound_oss_mutex);
 139         return 0;
 140
 141       __end:
 142         if (register2 >= 0)
 143                 unregister_sound_special(register2);
 144         if (register1 >= 0)
 145                 unregister_sound_special(register1);
 146         list_del(&preg->list);
 147         up(&sound_oss_mutex);
 148         kfree(preg);
 149         return -EBUSY;
 150 }
 151
 152 int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
 153 {
 154         int minor = snd_oss_kernel_minor(type, card, dev);
 155         int cidx = SNDRV_MINOR_OSS_CARD(minor);
 156         int track2 = -1;
 157         struct snd_minor *mptr;
 158
 159         if (minor < 0)
 160                 return minor;
 161         down(&sound_oss_mutex);
 162         mptr = snd_oss_minor_search(minor);
 163         if (mptr == NULL) {
 164                 up(&sound_oss_mutex);
 165                 return -ENOENT;
 166         }
 167         unregister_sound_special(minor);
 168         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
 169         case SNDRV_MINOR_OSS_PCM:
 170                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 171                 break;
 172         case SNDRV_MINOR_OSS_MIDI:
 173                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 174                 break;
 175         case SNDRV_MINOR_OSS_MIDI1:
 176                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 177                 break;
 178         }
 179         if (track2 >= 0)
 180                 unregister_sound_special(track2);
 181         list_del(&mptr->list);
 182         up(&sound_oss_mutex);
 183         kfree(mptr);
 184         return 0;
 185 }
 186
 187 /*
 188  *  INFO PART
 189  */
 190
 191 #ifdef CONFIG_PROC_FS
 192
 193 static struct snd_info_entry *snd_minor_info_oss_entry = NULL;
 194
 195 static const char *snd_oss_device_type_name(int type)
 196 {
 197         switch (type) {
 198         case SNDRV_OSS_DEVICE_TYPE_MIXER:
 199                 return "mixer";
 200         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
 201         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
 202                 return "sequencer";
 203         case SNDRV_OSS_DEVICE_TYPE_PCM:
 204                 return "digital audio";
 205         case SNDRV_OSS_DEVICE_TYPE_MIDI:
 206                 return "raw midi";
 207         case SNDRV_OSS_DEVICE_TYPE_DMFM:
 208                 return "hardware dependent";
 209         default:
 210                 return "?";
 211         }
 212 }
 213
 214 static void snd_minor_info_oss_read(struct snd_info_entry *entry,
 215                                     struct snd_info_buffer *buffer)
 216 {
 217         int card, dev;
 218         struct list_head *list;
 219         struct snd_minor *mptr;
 220
 221         down(&sound_oss_mutex);
 222         for (card = 0; card < SNDRV_CARDS; card++) {
 223                 list_for_each(list, &snd_oss_minors_hash[card]) {
 224                         mptr = list_entry(list, struct snd_minor, list);
 225                         dev = SNDRV_MINOR_OSS_DEVICE(mptr->number);
 226                         if (dev != SNDRV_MINOR_OSS_SNDSTAT &&
 227                             dev != SNDRV_MINOR_OSS_SEQUENCER &&
 228                             dev != SNDRV_MINOR_OSS_MUSIC)
 229                                 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, dev, snd_oss_device_type_name(mptr->type));
 230                         else
 231                                 snd_iprintf(buffer, "%3i:       : %s\n", mptr->number, snd_oss_device_type_name(mptr->type));
 232                 }
 233         }
 234         up(&sound_oss_mutex);
 235 }
 236
 237 #endif /* CONFIG_PROC_FS */
 238
 239 int __init snd_minor_info_oss_init(void)
 240 {
 241 #ifdef CONFIG_PROC_FS
 242         struct snd_info_entry *entry;
 243
 244         entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
 245         if (entry) {
 246                 entry->c.text.read_size = PAGE_SIZE;
 247                 entry->c.text.read = snd_minor_info_oss_read;
 248                 if (snd_info_register(entry) < 0) {
 249                         snd_info_free_entry(entry);
 250                         entry = NULL;
 251                 }
 252         }
 253         snd_minor_info_oss_entry = entry;
 254 #endif
 255         return 0;
 256 }
 257
 258 int __exit snd_minor_info_oss_done(void)
 259 {
 260 #ifdef CONFIG_PROC_FS
 261         if (snd_minor_info_oss_entry)
 262                 snd_info_unregister(snd_minor_info_oss_entry);
 263 #endif
 264         return 0;
 265 }
 266
 267 int __init snd_oss_init_module(void)
 268 {
 269         int card;
 270
 271         for (card = 0; card < SNDRV_CARDS; card++)
 272                 INIT_LIST_HEAD(&snd_oss_minors_hash[card]);
 273         return 0;
 274 }
 275
 276 #endif /* CONFIG_SND_OSSEMUL */