2 * Advanced Linux Sound Architecture
3 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
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.
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.
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
22 #include <sound/driver.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/moduleparam.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>
36 #define SNDRV_OS_MINORS 256
38 static int major = CONFIG_SND_MAJOR;
40 static int cards_limit = 1;
41 static int device_mode = S_IFCHR | S_IRUGO | S_IWUGO;
43 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
44 MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards.");
45 MODULE_LICENSE("GPL");
46 module_param(major, int, 0444);
47 MODULE_PARM_DESC(major, "Major # for sound driver.");
48 module_param(cards_limit, int, 0444);
49 MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards.");
50 #ifdef CONFIG_DEVFS_FS
51 module_param(device_mode, int, 0444);
52 MODULE_PARM_DESC(device_mode, "Device file permission mask for devfs.");
54 MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR);
56 /* this one holds the actual max. card number currently available.
57 * as default, it's identical with cards_limit option. when more
58 * modules are loaded manually, this limit number increases, too.
62 static struct snd_minor *snd_minors[SNDRV_OS_MINORS];
63 static DECLARE_MUTEX(sound_mutex);
65 extern struct class *sound_class;
71 * snd_request_card - try to load the card module
72 * @card: the card number
74 * Tries to load the module "snd-card-X" for the given card number
75 * via KMOD. Returns immediately if already loaded.
77 void snd_request_card(int card)
81 if (! current->fs->root)
83 read_lock(&snd_card_rwlock);
84 locked = snd_cards_lock & (1 << card);
85 read_unlock(&snd_card_rwlock);
88 if (card < 0 || card >= cards_limit)
90 request_module("snd-card-%i", card);
93 static void snd_request_other(int minor)
97 if (! current->fs->root)
100 case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break;
101 case SNDRV_MINOR_TIMER: str = "snd-timer"; break;
107 #endif /* request_module support */
110 * snd_lookup_minor_data - get user data of a registered device
111 * @minor: the minor number
112 * @type: device type (SNDRV_DEVICE_TYPE_XXX)
114 * Checks that a minor device with the specified type is registered, and returns
115 * its user data pointer.
117 void *snd_lookup_minor_data(unsigned int minor, int type)
119 struct snd_minor *mreg;
122 if (minor > ARRAY_SIZE(snd_minors))
125 mreg = snd_minors[minor];
126 if (mreg && mreg->type == type)
127 private_data = mreg->private_data;
134 static int snd_open(struct inode *inode, struct file *file)
136 unsigned int minor = iminor(inode);
137 struct snd_minor *mptr = NULL;
138 struct file_operations *old_fops;
141 if (minor > ARRAY_SIZE(snd_minors))
143 mptr = snd_minors[minor];
146 int dev = SNDRV_MINOR_DEVICE(minor);
147 if (dev == SNDRV_MINOR_CONTROL) {
149 int card = SNDRV_MINOR_CARD(minor);
150 if (snd_cards[card] == NULL)
151 snd_request_card(card);
152 } else if (dev == SNDRV_MINOR_GLOBAL) {
154 snd_request_other(minor);
156 #ifndef CONFIG_SND_DYNAMIC_MINORS
157 /* /dev/snd/{controlC?,seq} */
158 mptr = snd_minors[minor];
164 old_fops = file->f_op;
165 file->f_op = fops_get(mptr->f_ops);
166 if (file->f_op->open)
167 err = file->f_op->open(inode, file);
169 fops_put(file->f_op);
170 file->f_op = fops_get(old_fops);
176 static struct file_operations snd_fops =
178 .owner = THIS_MODULE,
182 #ifdef CONFIG_SND_DYNAMIC_MINORS
183 static int snd_find_free_minor(void)
187 for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
188 /* skip minors still used statically for autoloading devices */
189 if (SNDRV_MINOR_DEVICE(minor) == SNDRV_MINOR_CONTROL ||
190 minor == SNDRV_MINOR_SEQUENCER)
192 if (!snd_minors[minor])
198 static int snd_kernel_minor(int type, struct snd_card *card, int dev)
203 case SNDRV_DEVICE_TYPE_SEQUENCER:
204 case SNDRV_DEVICE_TYPE_TIMER:
207 case SNDRV_DEVICE_TYPE_CONTROL:
208 snd_assert(card != NULL, return -EINVAL);
209 minor = SNDRV_MINOR(card->number, type);
211 case SNDRV_DEVICE_TYPE_HWDEP:
212 case SNDRV_DEVICE_TYPE_RAWMIDI:
213 case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
214 case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
215 snd_assert(card != NULL, return -EINVAL);
216 minor = SNDRV_MINOR(card->number, type + dev);
221 snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
227 * snd_register_device - Register the ALSA device file for the card
228 * @type: the device type, SNDRV_DEVICE_TYPE_XXX
229 * @card: the card instance
230 * @dev: the device index
231 * @f_ops: the file operations
232 * @private_data: user pointer for f_ops->open()
233 * @name: the device file name
235 * Registers an ALSA device file for the given card.
236 * The operators have to be set in reg parameter.
238 * Retrurns zero if successful, or a negative error code on failure.
240 int snd_register_device(int type, struct snd_card *card, int dev,
241 struct file_operations *f_ops, void *private_data,
245 struct snd_minor *preg;
246 struct device *device = NULL;
248 snd_assert(name, return -EINVAL);
249 preg = kmalloc(sizeof(struct snd_minor) + strlen(name) + 1, GFP_KERNEL);
253 preg->card = card ? card->number : -1;
256 preg->private_data = private_data;
257 strcpy(preg->name, name);
259 #ifdef CONFIG_SND_DYNAMIC_MINORS
260 minor = snd_find_free_minor();
262 minor = snd_kernel_minor(type, card, dev);
263 if (minor >= 0 && snd_minors[minor])
271 snd_minors[minor] = preg;
272 if (type != SNDRV_DEVICE_TYPE_CONTROL || preg->card >= cards_limit)
273 devfs_mk_cdev(MKDEV(major, minor), S_IFCHR | device_mode, "snd/%s", name);
276 class_device_create(sound_class, NULL, MKDEV(major, minor), device, "%s", name);
283 * snd_unregister_device - unregister the device on the given card
284 * @type: the device type, SNDRV_DEVICE_TYPE_XXX
285 * @card: the card instance
286 * @dev: the device index
288 * Unregisters the device file already registered via
289 * snd_register_device().
291 * Returns zero if sucecessful, or a negative error code on failure
293 int snd_unregister_device(int type, struct snd_card *card, int dev)
296 struct snd_minor *mptr;
298 cardnum = card ? card->number : -1;
300 for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor)
301 if ((mptr = snd_minors[minor]) != NULL &&
302 mptr->type == type &&
303 mptr->card == cardnum &&
306 if (minor == ARRAY_SIZE(snd_minors)) {
311 if (mptr->type != SNDRV_DEVICE_TYPE_CONTROL ||
312 mptr->card >= cards_limit) /* created in sound.c */
313 devfs_remove("snd/%s", mptr->name);
314 class_device_destroy(sound_class, MKDEV(major, minor));
316 snd_minors[minor] = NULL;
326 static struct snd_info_entry *snd_minor_info_entry = NULL;
328 static const char *snd_device_type_name(int type)
331 case SNDRV_DEVICE_TYPE_CONTROL:
333 case SNDRV_DEVICE_TYPE_HWDEP:
334 return "hardware dependent";
335 case SNDRV_DEVICE_TYPE_RAWMIDI:
337 case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
338 return "digital audio playback";
339 case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
340 return "digital audio capture";
341 case SNDRV_DEVICE_TYPE_SEQUENCER:
343 case SNDRV_DEVICE_TYPE_TIMER:
350 static void snd_minor_info_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
353 struct snd_minor *mptr;
356 for (minor = 0; minor < SNDRV_OS_MINORS; ++minor) {
357 if (!(mptr = snd_minors[minor]))
359 if (mptr->card >= 0) {
360 if (mptr->device >= 0)
361 snd_iprintf(buffer, "%3i: [%2i-%2i]: %s\n",
362 minor, mptr->card, mptr->device,
363 snd_device_type_name(mptr->type));
365 snd_iprintf(buffer, "%3i: [%2i] : %s\n",
367 snd_device_type_name(mptr->type));
369 snd_iprintf(buffer, "%3i: : %s\n", minor,
370 snd_device_type_name(mptr->type));
375 int __init snd_minor_info_init(void)
377 struct snd_info_entry *entry;
379 entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
381 entry->c.text.read_size = PAGE_SIZE;
382 entry->c.text.read = snd_minor_info_read;
383 if (snd_info_register(entry) < 0) {
384 snd_info_free_entry(entry);
388 snd_minor_info_entry = entry;
392 int __exit snd_minor_info_done(void)
394 if (snd_minor_info_entry)
395 snd_info_unregister(snd_minor_info_entry);
403 static int __init alsa_sound_init(void)
408 snd_ecards_limit = cards_limit;
410 if (register_chrdev(major, "alsa", &snd_fops)) {
411 snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
415 if (snd_info_init() < 0) {
416 unregister_chrdev(major, "alsa");
420 snd_info_minor_register();
421 for (controlnum = 0; controlnum < cards_limit; controlnum++)
422 devfs_mk_cdev(MKDEV(major, controlnum<<5), S_IFCHR | device_mode, "snd/controlC%d", controlnum);
424 printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n");
429 static void __exit alsa_sound_exit(void)
433 for (controlnum = 0; controlnum < cards_limit; controlnum++)
434 devfs_remove("snd/controlC%d", controlnum);
436 snd_info_minor_unregister();
438 if (unregister_chrdev(major, "alsa") != 0)
439 snd_printk(KERN_ERR "unable to unregister major device number %d\n", major);
443 module_init(alsa_sound_init)
444 module_exit(alsa_sound_exit)
447 EXPORT_SYMBOL(snd_major);
448 EXPORT_SYMBOL(snd_ecards_limit);
449 #if defined(CONFIG_KMOD)
450 EXPORT_SYMBOL(snd_request_card);
452 EXPORT_SYMBOL(snd_register_device);
453 EXPORT_SYMBOL(snd_unregister_device);
454 EXPORT_SYMBOL(snd_lookup_minor_data);
455 #if defined(CONFIG_SND_OSSEMUL)
456 EXPORT_SYMBOL(snd_register_oss_device);
457 EXPORT_SYMBOL(snd_unregister_oss_device);
458 EXPORT_SYMBOL(snd_lookup_oss_minor_data);
461 EXPORT_SYMBOL(copy_to_user_fromio);
462 EXPORT_SYMBOL(copy_from_user_toio);
464 EXPORT_SYMBOL(snd_cards);
465 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
466 EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
468 EXPORT_SYMBOL(snd_card_new);
469 EXPORT_SYMBOL(snd_card_disconnect);
470 EXPORT_SYMBOL(snd_card_free);
471 EXPORT_SYMBOL(snd_card_free_in_thread);
472 EXPORT_SYMBOL(snd_card_register);
473 EXPORT_SYMBOL(snd_component_add);
474 EXPORT_SYMBOL(snd_card_file_add);
475 EXPORT_SYMBOL(snd_card_file_remove);
477 EXPORT_SYMBOL(snd_power_wait);
480 EXPORT_SYMBOL(snd_device_new);
481 EXPORT_SYMBOL(snd_device_register);
482 EXPORT_SYMBOL(snd_device_free);
484 #ifdef CONFIG_ISA_DMA_API
485 EXPORT_SYMBOL(snd_dma_program);
486 EXPORT_SYMBOL(snd_dma_disable);
487 EXPORT_SYMBOL(snd_dma_pointer);
490 #ifdef CONFIG_PROC_FS
491 EXPORT_SYMBOL(snd_seq_root);
492 EXPORT_SYMBOL(snd_iprintf);
493 EXPORT_SYMBOL(snd_info_get_line);
494 EXPORT_SYMBOL(snd_info_get_str);
495 EXPORT_SYMBOL(snd_info_create_module_entry);
496 EXPORT_SYMBOL(snd_info_create_card_entry);
497 EXPORT_SYMBOL(snd_info_free_entry);
498 EXPORT_SYMBOL(snd_info_register);
499 EXPORT_SYMBOL(snd_info_unregister);
500 EXPORT_SYMBOL(snd_card_proc_new);
503 #if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS)
504 EXPORT_SYMBOL(snd_oss_info_register);
507 EXPORT_SYMBOL(snd_ctl_new);
508 EXPORT_SYMBOL(snd_ctl_new1);
509 EXPORT_SYMBOL(snd_ctl_free_one);
510 EXPORT_SYMBOL(snd_ctl_add);
511 EXPORT_SYMBOL(snd_ctl_remove);
512 EXPORT_SYMBOL(snd_ctl_remove_id);
513 EXPORT_SYMBOL(snd_ctl_rename_id);
514 EXPORT_SYMBOL(snd_ctl_find_numid);
515 EXPORT_SYMBOL(snd_ctl_find_id);
516 EXPORT_SYMBOL(snd_ctl_notify);
517 EXPORT_SYMBOL(snd_ctl_register_ioctl);
518 EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
520 EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
521 EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
523 EXPORT_SYMBOL(snd_ctl_elem_read);
524 EXPORT_SYMBOL(snd_ctl_elem_write);
526 EXPORT_SYMBOL(release_and_free_resource);
527 #ifdef CONFIG_SND_VERBOSE_PRINTK
528 EXPORT_SYMBOL(snd_verbose_printk);
530 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_VERBOSE_PRINTK)
531 EXPORT_SYMBOL(snd_verbose_printd);