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 snd_minor_t *snd_oss_minor_search(int minor)
  45 {
  46         struct list_head *list;
  47         snd_minor_t *mptr;
  48
  49         list_for_each(list, &snd_oss_minors_hash[SNDRV_MINOR_OSS_CARD(minor)]) {
  50                 mptr = list_entry(list, snd_minor_t, list);
  51                 if (mptr->number == minor)
  52                         return mptr;
  53         }
  54         return NULL;
  55 }
  56
  57 static int snd_oss_kernel_minor(int type, snd_card_t * 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, snd_card_t * card, int dev, snd_minor_t * reg, const char *name)
  94 {
  95         int minor = snd_oss_kernel_minor(type, card, dev);
  96         int minor_unit;
  97         snd_minor_t *preg;
  98         int cidx = SNDRV_MINOR_OSS_CARD(minor);
  99         int track2 = -1;
 100         int register1 = -1, register2 = -1;
 101         struct device *carddev = NULL;
 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         down(&sound_oss_mutex);
 112         list_add_tail(&preg->list, &snd_oss_minors_hash[cidx]);
 113         minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
 114         switch (minor_unit) {
 115         case SNDRV_MINOR_OSS_PCM:
 116                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 117                 break;
 118         case SNDRV_MINOR_OSS_MIDI:
 119                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 120                 break;
 121         case SNDRV_MINOR_OSS_MIDI1:
 122                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 123                 break;
 124         }
 125         if (card)
 126                 carddev = card->dev;
 127         register1 = register_sound_special_device(reg->f_ops, minor, carddev);
 128         if (register1 != minor)
 129                 goto __end;
 130         if (track2 >= 0) {
 131                 register2 = register_sound_special_device(reg->f_ops, track2, carddev);
 132                 if (register2 != track2)
 133                         goto __end;
 134         }
 135         up(&sound_oss_mutex);
 136         return 0;
 137
 138       __end:
 139         if (register2 >= 0)
 140                 unregister_sound_special(register2);
 141         if (register1 >= 0)
 142                 unregister_sound_special(register1);
 143         list_del(&preg->list);
 144         up(&sound_oss_mutex);
 145         kfree(preg);
 146         return -EBUSY;
 147 }
 148
 149 int snd_unregister_oss_device(int type, snd_card_t * card, int dev)
 150 {
 151         int minor = snd_oss_kernel_minor(type, card, dev);
 152         int cidx = SNDRV_MINOR_OSS_CARD(minor);
 153         int track2 = -1;
 154         snd_minor_t *mptr;
 155
 156         if (minor < 0)
 157                 return minor;
 158         down(&sound_oss_mutex);
 159         mptr = snd_oss_minor_search(minor);
 160         if (mptr == NULL) {
 161                 up(&sound_oss_mutex);
 162                 return -ENOENT;
 163         }
 164         unregister_sound_special(minor);
 165         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
 166         case SNDRV_MINOR_OSS_PCM:
 167                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 168                 break;
 169         case SNDRV_MINOR_OSS_MIDI:
 170                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 171                 break;
 172         case SNDRV_MINOR_OSS_MIDI1:
 173                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 174                 break;
 175         }
 176         if (track2 >= 0)
 177                 unregister_sound_special(track2);
 178         list_del(&mptr->list);
 179         up(&sound_oss_mutex);
 180         kfree(mptr);
 181         return 0;
 182 }
 183
 184 /*
 185  *  INFO PART
 186  */
 187
 188 #ifdef CONFIG_PROC_FS
 189
 190 static snd_info_entry_t *snd_minor_info_oss_entry = NULL;
 191
 192 static void snd_minor_info_oss_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
 193 {
 194         int card, dev;
 195         struct list_head *list;
 196         snd_minor_t *mptr;
 197
 198         down(&sound_oss_mutex);
 199         for (card = 0; card < SNDRV_CARDS; card++) {
 200                 list_for_each(list, &snd_oss_minors_hash[card]) {
 201                         mptr = list_entry(list, snd_minor_t, list);
 202                         dev = SNDRV_MINOR_OSS_DEVICE(mptr->number);
 203                         if (dev != SNDRV_MINOR_OSS_SNDSTAT &&
 204                             dev != SNDRV_MINOR_OSS_SEQUENCER &&
 205                             dev != SNDRV_MINOR_OSS_MUSIC)
 206                                 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, dev, mptr->comment);
 207                         else
 208                                 snd_iprintf(buffer, "%3i:       : %s\n", mptr->number, mptr->comment);
 209                 }
 210         }
 211         up(&sound_oss_mutex);
 212 }
 213
 214 #endif /* CONFIG_PROC_FS */
 215
 216 int __init snd_minor_info_oss_init(void)
 217 {
 218 #ifdef CONFIG_PROC_FS
 219         snd_info_entry_t *entry;
 220
 221         entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
 222         if (entry) {
 223                 entry->c.text.read_size = PAGE_SIZE;
 224                 entry->c.text.read = snd_minor_info_oss_read;
 225                 if (snd_info_register(entry) < 0) {
 226                         snd_info_free_entry(entry);
 227                         entry = NULL;
 228                 }
 229         }
 230         snd_minor_info_oss_entry = entry;
 231 #endif
 232         return 0;
 233 }
 234
 235 int __exit snd_minor_info_oss_done(void)
 236 {
 237 #ifdef CONFIG_PROC_FS
 238         if (snd_minor_info_oss_entry)
 239                 snd_info_unregister(snd_minor_info_oss_entry);
 240 #endif
 241         return 0;
 242 }
 243
 244 int __init snd_oss_init_module(void)
 245 {
 246         int card;
 247
 248         for (card = 0; card < SNDRV_CARDS; card++)
 249                 INIT_LIST_HEAD(&snd_oss_minors_hash[card]);
 250         return 0;
 251 }
 252
 253 #endif /* CONFIG_SND_OSSEMUL */