sound/core/sound_oss.c

   1 /*
   2  *  Advanced Linux Sound Architecture
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.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 <linux/init.h>
  23 #include <linux/export.h>
  24 #include <linux/slab.h>
  25 #include <linux/time.h>
  26 #include <sound/core.h>
  27 #include <sound/minors.h>
  28 #include <sound/info.h>
  29 #include <linux/sound.h>
  30 #include <linux/mutex.h>
  31
  32 #define SNDRV_OSS_MINORS 256
  33
  34 static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
  35 static DEFINE_MUTEX(sound_oss_mutex);
  36
  37 /* NOTE: This function increments the refcount of the associated card like
  38  * snd_lookup_minor_data(); the caller must call snd_card_unref() appropriately
  39  */
  40 void *snd_lookup_oss_minor_data(unsigned int minor, int type)
  41 {
  42         struct snd_minor *mreg;
  43         void *private_data;
  44
  45         if (minor >= ARRAY_SIZE(snd_oss_minors))
  46                 return NULL;
  47         mutex_lock(&sound_oss_mutex);
  48         mreg = snd_oss_minors[minor];
  49         if (mreg && mreg->type == type) {
  50                 private_data = mreg->private_data;
  51                 if (private_data && mreg->card_ptr)
  52                         get_device(&mreg->card_ptr->card_dev);
  53         } else
  54                 private_data = NULL;
  55         mutex_unlock(&sound_oss_mutex);
  56         return private_data;
  57 }
  58 EXPORT_SYMBOL(snd_lookup_oss_minor_data);
  59
  60 static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
  61 {
  62         int minor;
  63
  64         switch (type) {
  65         case SNDRV_OSS_DEVICE_TYPE_MIXER:
  66                 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
  67                         return -EINVAL;
  68                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
  69                 break;
  70         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
  71                 minor = SNDRV_MINOR_OSS_SEQUENCER;
  72                 break;
  73         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
  74                 minor = SNDRV_MINOR_OSS_MUSIC;
  75                 break;
  76         case SNDRV_OSS_DEVICE_TYPE_PCM:
  77                 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
  78                         return -EINVAL;
  79                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
  80                 break;
  81         case SNDRV_OSS_DEVICE_TYPE_MIDI:
  82                 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
  83                         return -EINVAL;
  84                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
  85                 break;
  86         case SNDRV_OSS_DEVICE_TYPE_DMFM:
  87                 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
  88                 break;
  89         case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
  90                 minor = SNDRV_MINOR_OSS_SNDSTAT;
  91                 break;
  92         default:
  93                 return -EINVAL;
  94         }
  95         if (minor < 0 || minor >= SNDRV_OSS_MINORS)
  96                 return -EINVAL;
  97         return minor;
  98 }
  99
 100 int snd_register_oss_device(int type, struct snd_card *card, int dev,
 101                             const struct file_operations *f_ops, void *private_data)
 102 {
 103         int minor = snd_oss_kernel_minor(type, card, dev);
 104         int minor_unit;
 105         struct snd_minor *preg;
 106         int cidx = SNDRV_MINOR_OSS_CARD(minor);
 107         int track2 = -1;
 108         int register1 = -1, register2 = -1;
 109         struct device *carddev = snd_card_get_device_link(card);
 110
 111         if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
 112                 return 0; /* ignore silently */
 113         if (minor < 0)
 114                 return minor;
 115         preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
 116         if (preg == NULL)
 117                 return -ENOMEM;
 118         preg->type = type;
 119         preg->card = card ? card->number : -1;
 120         preg->device = dev;
 121         preg->f_ops = f_ops;
 122         preg->private_data = private_data;
 123         preg->card_ptr = card;
 124         mutex_lock(&sound_oss_mutex);
 125         snd_oss_minors[minor] = preg;
 126         minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
 127         switch (minor_unit) {
 128         case SNDRV_MINOR_OSS_PCM:
 129                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 130                 break;
 131         case SNDRV_MINOR_OSS_MIDI:
 132                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 133                 break;
 134         case SNDRV_MINOR_OSS_MIDI1:
 135                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 136                 break;
 137         }
 138         register1 = register_sound_special_device(f_ops, minor, carddev);
 139         if (register1 != minor)
 140                 goto __end;
 141         if (track2 >= 0) {
 142                 register2 = register_sound_special_device(f_ops, track2,
 143                                                           carddev);
 144                 if (register2 != track2)
 145                         goto __end;
 146                 snd_oss_minors[track2] = preg;
 147         }
 148         mutex_unlock(&sound_oss_mutex);
 149         return 0;
 150
 151       __end:
 152         if (register2 >= 0)
 153                 unregister_sound_special(register2);
 154         if (register1 >= 0)
 155                 unregister_sound_special(register1);
 156         snd_oss_minors[minor] = NULL;
 157         mutex_unlock(&sound_oss_mutex);
 158         kfree(preg);
 159         return -EBUSY;
 160 }
 161 EXPORT_SYMBOL(snd_register_oss_device);
 162
 163 int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
 164 {
 165         int minor = snd_oss_kernel_minor(type, card, dev);
 166         int cidx = SNDRV_MINOR_OSS_CARD(minor);
 167         int track2 = -1;
 168         struct snd_minor *mptr;
 169
 170         if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
 171                 return 0;
 172         if (minor < 0)
 173                 return minor;
 174         mutex_lock(&sound_oss_mutex);
 175         mptr = snd_oss_minors[minor];
 176         if (mptr == NULL) {
 177                 mutex_unlock(&sound_oss_mutex);
 178                 return -ENOENT;
 179         }
 180         unregister_sound_special(minor);
 181         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
 182         case SNDRV_MINOR_OSS_PCM:
 183                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 184                 break;
 185         case SNDRV_MINOR_OSS_MIDI:
 186                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 187                 break;
 188         case SNDRV_MINOR_OSS_MIDI1:
 189                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 190                 break;
 191         }
 192         if (track2 >= 0) {
 193                 unregister_sound_special(track2);
 194                 snd_oss_minors[track2] = NULL;
 195         }
 196         snd_oss_minors[minor] = NULL;
 197         mutex_unlock(&sound_oss_mutex);
 198         kfree(mptr);
 199         return 0;
 200 }
 201 EXPORT_SYMBOL(snd_unregister_oss_device);
 202
 203 /*
 204  *  INFO PART
 205  */
 206
 207 #ifdef CONFIG_SND_PROC_FS
 208 static const char *snd_oss_device_type_name(int type)
 209 {
 210         switch (type) {
 211         case SNDRV_OSS_DEVICE_TYPE_MIXER:
 212                 return "mixer";
 213         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
 214         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
 215                 return "sequencer";
 216         case SNDRV_OSS_DEVICE_TYPE_PCM:
 217                 return "digital audio";
 218         case SNDRV_OSS_DEVICE_TYPE_MIDI:
 219                 return "raw midi";
 220         case SNDRV_OSS_DEVICE_TYPE_DMFM:
 221                 return "hardware dependent";
 222         default:
 223                 return "?";
 224         }
 225 }
 226
 227 static void snd_minor_info_oss_read(struct snd_info_entry *entry,
 228                                     struct snd_info_buffer *buffer)
 229 {
 230         int minor;
 231         struct snd_minor *mptr;
 232
 233         mutex_lock(&sound_oss_mutex);
 234         for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
 235                 if (!(mptr = snd_oss_minors[minor]))
 236                         continue;
 237                 if (mptr->card >= 0)
 238                         snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
 239                                     mptr->card, mptr->device,
 240                                     snd_oss_device_type_name(mptr->type));
 241                 else
 242                         snd_iprintf(buffer, "%3i:       : %s\n", minor,
 243                                     snd_oss_device_type_name(mptr->type));
 244         }
 245         mutex_unlock(&sound_oss_mutex);
 246 }
 247
 248
 249 int __init snd_minor_info_oss_init(void)
 250 {
 251         struct snd_info_entry *entry;
 252
 253         entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
 254         if (!entry)
 255                 return -ENOMEM;
 256         entry->c.text.read = snd_minor_info_oss_read;
 257         return snd_info_register(entry); /* freed in error path */
 258 }
 259 #endif /* CONFIG_SND_PROC_FS */