sound/core/sound.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 #include <linux/version.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/time.h>
  27 #include <sound/core.h>
  28 #include <sound/minors.h>
  29 #include <sound/info.h>
  30 #include <sound/version.h>
  31 #include <sound/control.h>
  32 #include <sound/initval.h>
  33 #include <linux/kmod.h>
  34 #include <linux/devfs_fs_kernel.h>
  35
  36 #define SNDRV_OS_MINORS 256
  37
  38 static int major = CONFIG_SND_MAJOR;
  39 int snd_major;
  40 static int cards_limit = SNDRV_CARDS;
  41 #ifdef CONFIG_DEVFS_FS
  42 static int device_mode = S_IFCHR | S_IRUGO | S_IWUGO;
  43 #endif
  44
  45 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
  46 MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards.");
  47 MODULE_LICENSE("GPL");
  48 MODULE_CLASSES("{sound}");
  49 MODULE_SUPPORTED_DEVICE("sound");
  50 MODULE_PARM(major, "i");
  51 MODULE_PARM_DESC(major, "Major # for sound driver.");
  52 MODULE_PARM_SYNTAX(major, "default:116,skill:devel");
  53 MODULE_PARM(cards_limit, "i");
  54 MODULE_PARM_DESC(cards_limit, "Count of soundcards installed in the system.");
  55 MODULE_PARM_SYNTAX(cards_limit, "default:8,skill:advanced");
  56 #ifdef CONFIG_DEVFS_FS
  57 MODULE_PARM(device_mode, "i");
  58 MODULE_PARM_DESC(device_mode, "Device file permission mask for devfs.");
  59 MODULE_PARM_SYNTAX(device_mode, "default:0666,base:8");
  60 #endif
  61
  62 int snd_ecards_limit;
  63
  64 static struct list_head snd_minors_hash[SNDRV_CARDS];
  65
  66 static DECLARE_MUTEX(sound_mutex);
  67
  68 #ifdef CONFIG_KMOD
  69
  70 /**
  71  * snd_request_card - try to load the card module
  72  * @card: the card number
  73  *
  74  * Tries to load the module "snd-card-X" for the given card number
  75  * via KMOD.  Returns immediately if already loaded.
  76  */
  77 void snd_request_card(int card)
  78 {
  79         int locked;
  80
  81         read_lock(&snd_card_rwlock);
  82         locked = snd_cards_lock & (1 << card);
  83         read_unlock(&snd_card_rwlock);
  84         if (locked)
  85                 return;
  86         if (card < 0 || card >= cards_limit)
  87                 return;
  88         request_module("snd-card-%i", card);
  89 }
  90
  91 static void snd_request_other(int minor)
  92 {
  93         char *str;
  94
  95         switch (minor) {
  96         case SNDRV_MINOR_SEQUENCER:     str = "snd-seq";        break;
  97         case SNDRV_MINOR_TIMER:         str = "snd-timer";      break;
  98         default:                        return;
  99         }
 100         request_module(str);
 101 }
 102
 103 #endif                          /* request_module support */
 104
 105 static snd_minor_t *snd_minor_search(int minor)
 106 {
 107         struct list_head *list;
 108         snd_minor_t *mptr;
 109
 110         list_for_each(list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]) {
 111                 mptr = list_entry(list, snd_minor_t, list);
 112                 if (mptr->number == minor)
 113                         return mptr;
 114         }
 115         return NULL;
 116 }
 117
 118 static int snd_open(struct inode *inode, struct file *file)
 119 {
 120         int minor = minor(inode->i_rdev);
 121         int card = SNDRV_MINOR_CARD(minor);
 122         int dev = SNDRV_MINOR_DEVICE(minor);
 123         snd_minor_t *mptr = NULL;
 124         struct file_operations *old_fops;
 125         int err = 0;
 126
 127         if (dev != SNDRV_MINOR_SEQUENCER && dev != SNDRV_MINOR_TIMER) {
 128                 if (snd_cards[card] == NULL) {
 129 #ifdef CONFIG_KMOD
 130                         snd_request_card(card);
 131                         if (snd_cards[card] == NULL)
 132 #endif
 133                                 return -ENODEV;
 134                 }
 135         } else {
 136 #ifdef CONFIG_KMOD
 137                 if ((mptr = snd_minor_search(minor)) == NULL)
 138                         snd_request_other(minor);
 139 #endif
 140         }
 141         if (mptr == NULL && (mptr = snd_minor_search(minor)) == NULL)
 142                 return -ENODEV;
 143         old_fops = file->f_op;
 144         file->f_op = fops_get(mptr->f_ops);
 145         if (file->f_op->open)
 146                 err = file->f_op->open(inode, file);
 147         if (err) {
 148                 fops_put(file->f_op);
 149                 file->f_op = fops_get(old_fops);
 150         }
 151         fops_put(old_fops);
 152         return err;
 153 }
 154
 155 struct file_operations snd_fops =
 156 {
 157         .owner =        THIS_MODULE,
 158         .open =         snd_open
 159 };
 160
 161 static int snd_kernel_minor(int type, snd_card_t * card, int dev)
 162 {
 163         int minor;
 164
 165         switch (type) {
 166         case SNDRV_DEVICE_TYPE_SEQUENCER:
 167         case SNDRV_DEVICE_TYPE_TIMER:
 168                 minor = type;
 169                 break;
 170         case SNDRV_DEVICE_TYPE_CONTROL:
 171                 snd_assert(card != NULL, return -EINVAL);
 172                 minor = SNDRV_MINOR(card->number, type);
 173                 break;
 174         case SNDRV_DEVICE_TYPE_HWDEP:
 175         case SNDRV_DEVICE_TYPE_RAWMIDI:
 176         case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
 177         case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
 178                 snd_assert(card != NULL, return -EINVAL);
 179                 minor = SNDRV_MINOR(card->number, type + dev);
 180                 break;
 181         default:
 182                 return -EINVAL;
 183         }
 184         snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
 185         return minor;
 186 }
 187
 188 /**
 189  * snd_register_device - Register the ALSA device file for the card
 190  * @type: the device type, SNDRV_DEVICE_TYPE_XXX
 191  * @card: the card instance
 192  * @dev: the device index
 193  * @reg: the snd_minor_t record
 194  * @name: the device file name
 195  *
 196  * Registers an ALSA device file for the given card.
 197  * The operators have to be set in reg parameter.
 198  *
 199  * Retrurns zero if successful, or a negative error code on failure.
 200  */
 201 int snd_register_device(int type, snd_card_t * card, int dev, snd_minor_t * reg, const char *name)
 202 {
 203         int minor = snd_kernel_minor(type, card, dev);
 204         snd_minor_t *preg;
 205
 206         if (minor < 0)
 207                 return minor;
 208         snd_assert(name, return -EINVAL);
 209         preg = (snd_minor_t *)kmalloc(sizeof(snd_minor_t) + strlen(name) + 1, GFP_KERNEL);
 210         if (preg == NULL)
 211                 return -ENOMEM;
 212         *preg = *reg;
 213         preg->number = minor;
 214         preg->device = dev;
 215         strcpy(preg->name, name);
 216         down(&sound_mutex);
 217         if (snd_minor_search(minor)) {
 218                 up(&sound_mutex);
 219                 kfree(preg);
 220                 return -EBUSY;
 221         }
 222         list_add_tail(&preg->list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]);
 223 #ifdef CONFIG_DEVFS_FS
 224         if (strncmp(name, "controlC", 8))     /* created in sound.c */
 225                 devfs_mk_cdev(MKDEV(major, minor), S_IFCHR | device_mode, "snd/%s", name);
 226 #endif
 227         up(&sound_mutex);
 228         return 0;
 229 }
 230
 231 /**
 232  * snd_unregister_device - unregister the device on the given card
 233  * @type: the device type, SNDRV_DEVICE_TYPE_XXX
 234  * @card: the card instance
 235  * @dev: the device index
 236  *
 237  * Unregisters the device file already registered via
 238  * snd_register_device().
 239  *
 240  * Returns zero if sucecessful, or a negative error code on failure
 241  */
 242 int snd_unregister_device(int type, snd_card_t * card, int dev)
 243 {
 244         int minor = snd_kernel_minor(type, card, dev);
 245         snd_minor_t *mptr;
 246
 247         if (minor < 0)
 248                 return minor;
 249         down(&sound_mutex);
 250         if ((mptr = snd_minor_search(minor)) == NULL) {
 251                 up(&sound_mutex);
 252                 return -EINVAL;
 253         }
 254 #ifdef CONFIG_DEVFS_FS
 255         if (strncmp(mptr->name, "controlC", 8)) /* created in sound.c */
 256                 devfs_remove("snd/%s", mptr->name);
 257 #endif
 258         list_del(&mptr->list);
 259         up(&sound_mutex);
 260         kfree(mptr);
 261         return 0;
 262 }
 263
 264 /*
 265  *  INFO PART
 266  */
 267
 268 static snd_info_entry_t *snd_minor_info_entry = NULL;
 269
 270 static void snd_minor_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
 271 {
 272         int card, device;
 273         struct list_head *list;
 274         snd_minor_t *mptr;
 275
 276         down(&sound_mutex);
 277         for (card = 0; card < SNDRV_CARDS; card++) {
 278                 list_for_each(list, &snd_minors_hash[card]) {
 279                         mptr = list_entry(list, snd_minor_t, list);
 280                         if (SNDRV_MINOR_DEVICE(mptr->number) != SNDRV_MINOR_SEQUENCER) {
 281                                 if ((device = mptr->device) >= 0)
 282                                         snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, device, mptr->comment);
 283                                 else
 284                                         snd_iprintf(buffer, "%3i: [%i]   : %s\n", mptr->number, card, mptr->comment);
 285                         } else {
 286                                 snd_iprintf(buffer, "%3i:       : %s\n", mptr->number, mptr->comment);
 287                         }
 288                 }
 289         }
 290         up(&sound_mutex);
 291 }
 292
 293 int __init snd_minor_info_init(void)
 294 {
 295         snd_info_entry_t *entry;
 296
 297         entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
 298         if (entry) {
 299                 entry->content = SNDRV_INFO_CONTENT_TEXT;
 300                 entry->c.text.read_size = PAGE_SIZE;
 301                 entry->c.text.read = snd_minor_info_read;
 302                 if (snd_info_register(entry) < 0) {
 303                         snd_info_free_entry(entry);
 304                         entry = NULL;
 305                 }
 306         }
 307         snd_minor_info_entry = entry;
 308         return 0;
 309 }
 310
 311 int __exit snd_minor_info_done(void)
 312 {
 313         if (snd_minor_info_entry)
 314                 snd_info_unregister(snd_minor_info_entry);
 315         return 0;
 316 }
 317
 318 /*
 319  *  INIT PART
 320  */
 321
 322 static int __init alsa_sound_init(void)
 323 {
 324 #ifdef CONFIG_DEVFS_FS
 325         short controlnum;
 326 #endif
 327 #ifdef CONFIG_SND_OSSEMUL
 328         int err;
 329 #endif
 330         int card;
 331
 332         snd_major = major;
 333         snd_ecards_limit = cards_limit;
 334         for (card = 0; card < SNDRV_CARDS; card++)
 335                 INIT_LIST_HEAD(&snd_minors_hash[card]);
 336 #ifdef CONFIG_SND_OSSEMUL
 337         if ((err = snd_oss_init_module()) < 0)
 338                 return err;
 339 #endif
 340         devfs_mk_dir("snd");
 341         if (register_chrdev(major, "alsa", &snd_fops)) {
 342                 snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
 343                 devfs_remove("snd");
 344                 return -EIO;
 345         }
 346 #ifdef CONFIG_SND_DEBUG_MEMORY
 347         snd_memory_init();
 348 #endif
 349         if (snd_info_init() < 0) {
 350 #ifdef CONFIG_SND_DEBUG_MEMORY
 351                 snd_memory_done();
 352 #endif
 353                 unregister_chrdev(major, "alsa");
 354                 devfs_remove("snd");
 355                 return -ENOMEM;
 356         }
 357 #ifdef CONFIG_SND_OSSEMUL
 358         snd_info_minor_register();
 359 #endif
 360 #ifdef CONFIG_DEVFS_FS
 361         for (controlnum = 0; controlnum < cards_limit; controlnum++)
 362                 devfs_mk_cdev(MKDEV(major, controlnum<<5), S_IFCHR | device_mode, "snd/controlC%d", controlnum);
 363 #endif
 364 #ifndef MODULE
 365         printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n");
 366 #endif
 367         return 0;
 368 }
 369
 370 static void __exit alsa_sound_exit(void)
 371 {
 372         short controlnum;
 373
 374         for (controlnum = 0; controlnum < cards_limit; controlnum++)
 375                 devfs_remove("snd/controlC%d", controlnum);
 376
 377 #ifdef CONFIG_SND_OSSEMUL
 378         snd_info_minor_unregister();
 379 #endif
 380         snd_info_done();
 381 #ifdef CONFIG_SND_DEBUG_MEMORY
 382         snd_memory_done();
 383 #endif
 384         if (unregister_chrdev(major, "alsa") != 0)
 385                 snd_printk(KERN_ERR "unable to unregister major device number %d\n", major);
 386         devfs_remove("snd");
 387 }
 388
 389 module_init(alsa_sound_init)
 390 module_exit(alsa_sound_exit)
 391
 392   /* sound.c */
 393 EXPORT_SYMBOL(snd_major);
 394 EXPORT_SYMBOL(snd_ecards_limit);
 395 #if defined(CONFIG_KMOD)
 396 EXPORT_SYMBOL(snd_request_card);
 397 #endif
 398 EXPORT_SYMBOL(snd_register_device);
 399 EXPORT_SYMBOL(snd_unregister_device);
 400 #if defined(CONFIG_SND_OSSEMUL)
 401 EXPORT_SYMBOL(snd_register_oss_device);
 402 EXPORT_SYMBOL(snd_unregister_oss_device);
 403 #endif
 404   /* memory.c */
 405 #ifdef CONFIG_SND_DEBUG_MEMORY
 406 EXPORT_SYMBOL(snd_hidden_kmalloc);
 407 EXPORT_SYMBOL(snd_hidden_kfree);
 408 EXPORT_SYMBOL(snd_hidden_vmalloc);
 409 EXPORT_SYMBOL(snd_hidden_vfree);
 410 EXPORT_SYMBOL(_snd_magic_kmalloc);
 411 EXPORT_SYMBOL(_snd_magic_kcalloc);
 412 EXPORT_SYMBOL(snd_magic_kfree);
 413 #endif
 414 EXPORT_SYMBOL(snd_kcalloc);
 415 EXPORT_SYMBOL(snd_kmalloc_strdup);
 416 EXPORT_SYMBOL(copy_to_user_fromio);
 417 EXPORT_SYMBOL(copy_from_user_toio);
 418   /* init.c */
 419 EXPORT_SYMBOL(snd_cards_count);
 420 EXPORT_SYMBOL(snd_cards);
 421 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
 422 EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
 423 #endif
 424 EXPORT_SYMBOL(snd_card_new);
 425 EXPORT_SYMBOL(snd_card_disconnect);
 426 EXPORT_SYMBOL(snd_card_free);
 427 EXPORT_SYMBOL(snd_card_free_in_thread);
 428 EXPORT_SYMBOL(snd_card_register);
 429 EXPORT_SYMBOL(snd_component_add);
 430 EXPORT_SYMBOL(snd_card_file_add);
 431 EXPORT_SYMBOL(snd_card_file_remove);
 432 #ifdef CONFIG_PM
 433 EXPORT_SYMBOL(snd_power_wait);
 434 #endif
 435   /* device.c */
 436 EXPORT_SYMBOL(snd_device_new);
 437 EXPORT_SYMBOL(snd_device_register);
 438 EXPORT_SYMBOL(snd_device_free);
 439 EXPORT_SYMBOL(snd_device_free_all);
 440   /* isadma.c */
 441 #ifdef CONFIG_ISA
 442 EXPORT_SYMBOL(snd_dma_program);
 443 EXPORT_SYMBOL(snd_dma_disable);
 444 EXPORT_SYMBOL(snd_dma_pointer);
 445 #endif
 446   /* info.c */
 447 #ifdef CONFIG_PROC_FS
 448 EXPORT_SYMBOL(snd_seq_root);
 449 EXPORT_SYMBOL(snd_create_proc_entry);
 450 EXPORT_SYMBOL(snd_remove_proc_entry);
 451 EXPORT_SYMBOL(snd_iprintf);
 452 EXPORT_SYMBOL(snd_info_get_line);
 453 EXPORT_SYMBOL(snd_info_get_str);
 454 EXPORT_SYMBOL(snd_info_create_module_entry);
 455 EXPORT_SYMBOL(snd_info_create_card_entry);
 456 EXPORT_SYMBOL(snd_info_free_entry);
 457 EXPORT_SYMBOL(snd_info_register);
 458 EXPORT_SYMBOL(snd_info_unregister);
 459 EXPORT_SYMBOL(snd_card_proc_new);
 460 #endif
 461   /* info_oss.c */
 462 #if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS)
 463 EXPORT_SYMBOL(snd_oss_info_register);
 464 #endif
 465   /* control.c */
 466 EXPORT_SYMBOL(snd_ctl_new);
 467 EXPORT_SYMBOL(snd_ctl_new1);
 468 EXPORT_SYMBOL(snd_ctl_free_one);
 469 EXPORT_SYMBOL(snd_ctl_add);
 470 EXPORT_SYMBOL(snd_ctl_remove);
 471 EXPORT_SYMBOL(snd_ctl_remove_id);
 472 EXPORT_SYMBOL(snd_ctl_rename_id);
 473 EXPORT_SYMBOL(snd_ctl_find_numid);
 474 EXPORT_SYMBOL(snd_ctl_find_id);
 475 EXPORT_SYMBOL(snd_ctl_notify);
 476 EXPORT_SYMBOL(snd_ctl_register_ioctl);
 477 EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
 478   /* misc.c */
 479 EXPORT_SYMBOL(snd_task_name);
 480 #ifdef CONFIG_SND_VERBOSE_PRINTK
 481 EXPORT_SYMBOL(snd_verbose_printk);
 482 #endif
 483 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_VERBOSE_PRINTK)
 484 EXPORT_SYMBOL(snd_verbose_printd);
 485 #endif
 486   /* wrappers */
 487 #ifdef CONFIG_SND_DEBUG_MEMORY
 488 EXPORT_SYMBOL(snd_wrapper_kmalloc);
 489 EXPORT_SYMBOL(snd_wrapper_kfree);
 490 EXPORT_SYMBOL(snd_wrapper_vmalloc);
 491 EXPORT_SYMBOL(snd_wrapper_vfree);
 492 #endif