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