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
 102         if (minor < 0)
 103                 return minor;
 104         preg = (snd_minor_t *)kmalloc(sizeof(snd_minor_t), GFP_KERNEL);
 105         if (preg == NULL)
 106                 return -ENOMEM;
 107         *preg = *reg;
 108         preg->number = minor;
 109         preg->device = dev;
 110         down(&sound_oss_mutex);
 111         list_add_tail(&preg->list, &snd_oss_minors_hash[cidx]);
 112         minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
 113         switch (minor_unit) {
 114         case SNDRV_MINOR_OSS_PCM:
 115                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 116                 break;
 117         case SNDRV_MINOR_OSS_MIDI:
 118                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 119                 break;
 120         case SNDRV_MINOR_OSS_MIDI1:
 121                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 122                 break;
 123         }
 124         register1 = register_sound_special(reg->f_ops, minor);
 125         if (register1 != minor)
 126                 goto __end;
 127         if (track2 >= 0) {
 128                 register2 = register_sound_special(reg->f_ops, track2);
 129                 if (register2 != track2)
 130                         goto __end;
 131         }
 132         up(&sound_oss_mutex);
 133         return 0;
 134
 135       __end:
 136         if (register2 >= 0)
 137                 unregister_sound_special(register2);
 138         if (register1 >= 0)
 139                 unregister_sound_special(register1);
 140         list_del(&preg->list);
 141         up(&sound_oss_mutex);
 142         kfree(preg);
 143         return -EBUSY;
 144 }
 145
 146 int snd_unregister_oss_device(int type, snd_card_t * card, int dev)
 147 {
 148         int minor = snd_oss_kernel_minor(type, card, dev);
 149         int cidx = SNDRV_MINOR_OSS_CARD(minor);
 150         int track2 = -1;
 151         snd_minor_t *mptr;
 152
 153         if (minor < 0)
 154                 return minor;
 155         down(&sound_oss_mutex);
 156         mptr = snd_oss_minor_search(minor);
 157         if (mptr == NULL) {
 158                 up(&sound_oss_mutex);
 159                 return -ENOENT;
 160         }
 161         unregister_sound_special(minor);
 162         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
 163         case SNDRV_MINOR_OSS_PCM:
 164                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 165                 break;
 166         case SNDRV_MINOR_OSS_MIDI:
 167                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 168                 break;
 169         case SNDRV_MINOR_OSS_MIDI1:
 170                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 171                 break;
 172         }
 173         if (track2 >= 0)
 174                 unregister_sound_special(track2);
 175         list_del(&mptr->list);
 176         up(&sound_oss_mutex);
 177         kfree(mptr);
 178         return 0;
 179 }
 180
 181 /*
 182  *  INFO PART
 183  */
 184
 185 #ifdef CONFIG_PROC_FS
 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 #endif /* CONFIG_PROC_FS */
 212
 213 int __init snd_minor_info_oss_init(void)
 214 {
 215 #ifdef CONFIG_PROC_FS
 216         snd_info_entry_t *entry;
 217
 218         entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
 219         if (entry) {
 220                 entry->c.text.read_size = PAGE_SIZE;
 221                 entry->c.text.read = snd_minor_info_oss_read;
 222                 if (snd_info_register(entry) < 0) {
 223                         snd_info_free_entry(entry);
 224                         entry = NULL;
 225                 }
 226         }
 227         snd_minor_info_oss_entry = entry;
 228 #endif
 229         return 0;
 230 }
 231
 232 int __exit snd_minor_info_oss_done(void)
 233 {
 234 #ifdef CONFIG_PROC_FS
 235         if (snd_minor_info_oss_entry)
 236                 snd_info_unregister(snd_minor_info_oss_entry);
 237 #endif
 238         return 0;
 239 }
 240
 241 int __init snd_oss_init_module(void)
 242 {
 243         int card;
 244
 245         for (card = 0; card < SNDRV_CARDS; card++)
 246                 INIT_LIST_HEAD(&snd_oss_minors_hash[card]);
 247         return 0;
 248 }
 249
 250 #endif /* CONFIG_SND_OSSEMUL */