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 #define __NO_VERSION__
  23 #include <sound/driver.h>
  24
  25 #ifdef CONFIG_SND_OSSEMUL
  26
  27 #if !defined(CONFIG_SOUND) && !defined(CONFIG_SOUND_MODULE)
  28 #error "Enable the OSS soundcore multiplexer (CONFIG_SOUND) in the kernel."
  29 #endif
  30
  31 #include <linux/init.h>
  32 #include <linux/slab.h>
  33 #include <linux/time.h>
  34 #include <sound/core.h>
  35 #include <sound/minors.h>
  36 #include <sound/info.h>
  37 #include <linux/sound.h>
  38
  39 #define SNDRV_OS_MINORS         256
  40
  41 static struct list_head snd_oss_minors_hash[SNDRV_CARDS];
  42
  43 static DECLARE_MUTEX(sound_oss_mutex);
  44
  45 static snd_minor_t *snd_oss_minor_search(int minor)
  46 {
  47         struct list_head *list;
  48         snd_minor_t *mptr;
  49
  50         list_for_each(list, &snd_oss_minors_hash[SNDRV_MINOR_OSS_CARD(minor)]) {
  51                 mptr = list_entry(list, snd_minor_t, list);
  52                 if (mptr->number == minor)
  53                         return mptr;
  54         }
  55         return NULL;
  56 }
  57
  58 static int snd_oss_kernel_minor(int type, snd_card_t * card, int dev)
  59 {
  60         int minor;
  61
  62         switch (type) {
  63         case SNDRV_OSS_DEVICE_TYPE_MIXER:
  64                 snd_assert(card != NULL && dev <= 1, return -EINVAL);
  65                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
  66                 break;
  67         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
  68                 minor = SNDRV_MINOR_OSS_SEQUENCER;
  69                 break;
  70         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
  71                 minor = SNDRV_MINOR_OSS_MUSIC;
  72                 break;
  73         case SNDRV_OSS_DEVICE_TYPE_PCM:
  74                 snd_assert(card != NULL && dev <= 1, return -EINVAL);
  75                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
  76                 break;
  77         case SNDRV_OSS_DEVICE_TYPE_MIDI:
  78                 snd_assert(card != NULL && dev <= 1, return -EINVAL);
  79                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
  80                 break;
  81         case SNDRV_OSS_DEVICE_TYPE_DMFM:
  82                 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
  83                 break;
  84         case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
  85                 minor = SNDRV_MINOR_OSS_SNDSTAT;
  86                 break;
  87         default:
  88                 return -EINVAL;
  89         }
  90         snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
  91         return minor;
  92 }
  93
  94 int snd_register_oss_device(int type, snd_card_t * card, int dev, snd_minor_t * reg, const char *name)
  95 {
  96         int minor = snd_oss_kernel_minor(type, card, dev);
  97         int minor_unit;
  98         snd_minor_t *preg;
  99         int cidx = SNDRV_MINOR_OSS_CARD(minor);
 100         int track2 = -1;
 101         int register1 = -1, register2 = -1;
 102
 103         if (minor < 0)
 104                 return minor;
 105         preg = (snd_minor_t *)kmalloc(sizeof(snd_minor_t), GFP_KERNEL);
 106         if (preg == NULL)
 107                 return -ENOMEM;
 108         *preg = *reg;
 109         preg->number = minor;
 110         preg->device = dev;
 111         preg->dev = NULL;
 112         down(&sound_oss_mutex);
 113         list_add_tail(&preg->list, &snd_oss_minors_hash[cidx]);
 114         minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
 115         switch (minor_unit) {
 116         case SNDRV_MINOR_OSS_PCM:
 117                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 118                 break;
 119         case SNDRV_MINOR_OSS_MIDI:
 120                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 121                 break;
 122         case SNDRV_MINOR_OSS_MIDI1:
 123                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 124                 break;
 125         }
 126         register1 = register_sound_special(reg->f_ops, minor);
 127         if (register1 != minor)
 128                 goto __end;
 129         if (track2 >= 0) {
 130                 register2 = register_sound_special(reg->f_ops, track2);
 131                 if (register2 != track2)
 132                         goto __end;
 133         }
 134         up(&sound_oss_mutex);
 135         return 0;
 136
 137       __end:
 138         if (register2 >= 0)
 139                 unregister_sound_special(register2);
 140         if (register1 >= 0)
 141                 unregister_sound_special(register1);
 142         list_del(&preg->list);
 143         up(&sound_oss_mutex);
 144         kfree(preg);
 145         return -EBUSY;
 146 }
 147
 148 int snd_unregister_oss_device(int type, snd_card_t * card, int dev)
 149 {
 150         int minor = snd_oss_kernel_minor(type, card, dev);
 151         int cidx = SNDRV_MINOR_OSS_CARD(minor);
 152         int track2 = -1;
 153         snd_minor_t *mptr;
 154
 155         if (minor < 0)
 156                 return minor;
 157         down(&sound_oss_mutex);
 158         mptr = snd_oss_minor_search(minor);
 159         if (mptr == NULL) {
 160                 up(&sound_oss_mutex);
 161                 return -ENOENT;
 162         }
 163         unregister_sound_special(minor);
 164         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
 165         case SNDRV_MINOR_OSS_PCM:
 166                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 167                 break;
 168         case SNDRV_MINOR_OSS_MIDI:
 169                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 170                 break;
 171         case SNDRV_MINOR_OSS_MIDI1:
 172                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 173                 break;
 174         }
 175         if (track2 >= 0)
 176                 unregister_sound_special(track2);
 177         list_del(&mptr->list);
 178         up(&sound_oss_mutex);
 179         kfree(mptr);
 180         return 0;
 181 }
 182
 183 /*
 184  *  INFO PART
 185  */
 186
 187 static snd_info_entry_t *snd_minor_info_oss_entry = NULL;
 188
 189 static void snd_minor_info_oss_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
 190 {
 191         int card, dev;
 192         struct list_head *list;
 193         snd_minor_t *mptr;
 194
 195         down(&sound_oss_mutex);
 196         for (card = 0; card < SNDRV_CARDS; card++) {
 197                 list_for_each(list, &snd_oss_minors_hash[card]) {
 198                         mptr = list_entry(list, snd_minor_t, list);
 199                         dev = SNDRV_MINOR_OSS_DEVICE(mptr->number);
 200                         if (dev != SNDRV_MINOR_OSS_SNDSTAT &&
 201                             dev != SNDRV_MINOR_OSS_SEQUENCER &&
 202                             dev != SNDRV_MINOR_OSS_MUSIC)
 203                                 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, dev, mptr->comment);
 204                         else
 205                                 snd_iprintf(buffer, "%3i:       : %s\n", mptr->number, mptr->comment);
 206                 }
 207         }
 208         up(&sound_oss_mutex);
 209 }
 210
 211 int __init snd_minor_info_oss_init(void)
 212 {
 213         snd_info_entry_t *entry;
 214
 215         entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
 216         if (entry) {
 217                 entry->content = SNDRV_INFO_CONTENT_TEXT;
 218                 entry->c.text.read_size = PAGE_SIZE;
 219                 entry->c.text.read = snd_minor_info_oss_read;
 220                 if (snd_info_register(entry) < 0) {
 221                         snd_info_free_entry(entry);
 222                         entry = NULL;
 223                 }
 224         }
 225         snd_minor_info_oss_entry = entry;
 226         return 0;
 227 }
 228
 229 int __exit snd_minor_info_oss_done(void)
 230 {
 231         if (snd_minor_info_oss_entry)
 232                 snd_info_unregister(snd_minor_info_oss_entry);
 233         return 0;
 234 }
 235
 236 int __init snd_oss_init_module(void)
 237 {
 238         int card;
 239
 240         for (card = 0; card < SNDRV_CARDS; card++)
 241                 INIT_LIST_HEAD(&snd_oss_minors_hash[card]);
 242         return 0;
 243 }
 244
 245 void snd_oss_cleanup_module(void)
 246 {
 247 }
 248
 249 #endif /* CONFIG_SND_OSSEMUL */