sound/core/sound_oss.c

   1 /*
   2  *  Advanced Linux Sound Architecture
   3  *  Copyright (c) by Jaroslav Kysela <[email protected]>
   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
  59 EXPORT_SYMBOL(snd_lookup_oss_minor_data);
  60
  61 static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
  62 {
  63         int minor;
  64
  65         switch (type) {
  66         case SNDRV_OSS_DEVICE_TYPE_MIXER:
  67                 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
  68                         return -EINVAL;
  69                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
  70                 break;
  71         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
  72                 minor = SNDRV_MINOR_OSS_SEQUENCER;
  73                 break;
  74         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
  75                 minor = SNDRV_MINOR_OSS_MUSIC;
  76                 break;
  77         case SNDRV_OSS_DEVICE_TYPE_PCM:
  78                 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
  79                         return -EINVAL;
  80                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
  81                 break;
  82         case SNDRV_OSS_DEVICE_TYPE_MIDI:
  83                 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
  84                         return -EINVAL;
  85                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
  86                 break;
  87         case SNDRV_OSS_DEVICE_TYPE_DMFM:
  88                 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
  89                 break;
  90         case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
  91                 minor = SNDRV_MINOR_OSS_SNDSTAT;
  92                 break;
  93         default:
  94                 return -EINVAL;
  95         }
  96         if (minor < 0 || minor >= SNDRV_OSS_MINORS)
  97                 return -EINVAL;
  98         return minor;
  99 }
 100
 101 int snd_register_oss_device(int type, struct snd_card *card, int dev,
 102                             const struct file_operations *f_ops, void *private_data)
 103 {
 104         int minor = snd_oss_kernel_minor(type, card, dev);
 105         int minor_unit;
 106         struct snd_minor *preg;
 107         int cidx = SNDRV_MINOR_OSS_CARD(minor);
 108         int track2 = -1;
 109         int register1 = -1, register2 = -1;
 110         struct device *carddev = snd_card_get_device_link(card);
 111
 112         if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
 113                 return 0; /* ignore silently */
 114         if (minor < 0)
 115                 return minor;
 116         preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
 117         if (preg == NULL)
 118                 return -ENOMEM;
 119         preg->type = type;
 120         preg->card = card ? card->number : -1;
 121         preg->device = dev;
 122         preg->f_ops = f_ops;
 123         preg->private_data = private_data;
 124         preg->card_ptr = card;
 125         mutex_lock(&sound_oss_mutex);
 126         snd_oss_minors[minor] = preg;
 127         minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
 128         switch (minor_unit) {
 129         case SNDRV_MINOR_OSS_PCM:
 130                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 131                 break;
 132         case SNDRV_MINOR_OSS_MIDI:
 133                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 134                 break;
 135         case SNDRV_MINOR_OSS_MIDI1:
 136                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 137                 break;
 138         }
 139         register1 = register_sound_special_device(f_ops, minor, carddev);
 140         if (register1 != minor)
 141                 goto __end;
 142         if (track2 >= 0) {
 143                 register2 = register_sound_special_device(f_ops, track2,
 144                                                           carddev);
 145                 if (register2 != track2)
 146                         goto __end;
 147                 snd_oss_minors[track2] = preg;
 148         }
 149         mutex_unlock(&sound_oss_mutex);
 150         return 0;
 151
 152       __end:
 153         if (register2 >= 0)
 154                 unregister_sound_special(register2);
 155         if (register1 >= 0)
 156                 unregister_sound_special(register1);
 157         snd_oss_minors[minor] = NULL;
 158         mutex_unlock(&sound_oss_mutex);
 159         kfree(preg);
 160         return -EBUSY;
 161 }
 162
 163 EXPORT_SYMBOL(snd_register_oss_device);
 164
 165 int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
 166 {
 167         int minor = snd_oss_kernel_minor(type, card, dev);
 168         int cidx = SNDRV_MINOR_OSS_CARD(minor);
 169         int track2 = -1;
 170         struct snd_minor *mptr;
 171
 172         if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
 173                 return 0;
 174         if (minor < 0)
 175                 return minor;
 176         mutex_lock(&sound_oss_mutex);
 177         mptr = snd_oss_minors[minor];
 178         if (mptr == NULL) {
 179                 mutex_unlock(&sound_oss_mutex);
 180                 return -ENOENT;
 181         }
 182         unregister_sound_special(minor);
 183         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
 184         case SNDRV_MINOR_OSS_PCM:
 185                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 186                 break;
 187         case SNDRV_MINOR_OSS_MIDI:
 188                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 189                 break;
 190         case SNDRV_MINOR_OSS_MIDI1:
 191                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 192                 break;
 193         }
 194         if (track2 >= 0) {
 195                 unregister_sound_special(track2);
 196                 snd_oss_minors[track2] = NULL;
 197         }
 198         snd_oss_minors[minor] = NULL;
 199         mutex_unlock(&sound_oss_mutex);
 200         kfree(mptr);
 201         return 0;
 202 }
 203
 204 EXPORT_SYMBOL(snd_unregister_oss_device);
 205
 206 /*
 207  *  INFO PART
 208  */
 209
 210 #ifdef CONFIG_SND_PROC_FS
 211 static const char *snd_oss_device_type_name(int type)
 212 {
 213         switch (type) {
 214         case SNDRV_OSS_DEVICE_TYPE_MIXER:
 215                 return "mixer";
 216         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
 217         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
 218                 return "sequencer";
 219         case SNDRV_OSS_DEVICE_TYPE_PCM:
 220                 return "digital audio";
 221         case SNDRV_OSS_DEVICE_TYPE_MIDI:
 222                 return "raw midi";
 223         case SNDRV_OSS_DEVICE_TYPE_DMFM:
 224                 return "hardware dependent";
 225         default:
 226                 return "?";
 227         }
 228 }
 229
 230 static void snd_minor_info_oss_read(struct snd_info_entry *entry,
 231                                     struct snd_info_buffer *buffer)
 232 {
 233         int minor;
 234         struct snd_minor *mptr;
 235
 236         mutex_lock(&sound_oss_mutex);
 237         for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
 238                 if (!(mptr = snd_oss_minors[minor]))
 239                         continue;
 240                 if (mptr->card >= 0)
 241                         snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
 242                                     mptr->card, mptr->device,
 243                                     snd_oss_device_type_name(mptr->type));
 244                 else
 245                         snd_iprintf(buffer, "%3i:       : %s\n", minor,
 246                                     snd_oss_device_type_name(mptr->type));
 247         }
 248         mutex_unlock(&sound_oss_mutex);
 249 }
 250
 251
 252 int __init snd_minor_info_oss_init(void)
 253 {
 254         struct snd_info_entry *entry;
 255
 256         entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
 257         if (!entry)
 258                 return -ENOMEM;
 259         entry->c.text.read = snd_minor_info_oss_read;
 260         return snd_info_register(entry); /* freed in error path */
 261 }
 262 #endif /* CONFIG_SND_PROC_FS */