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 <sound/core.h>
27 #include <sound/minors.h>
28 #include <sound/info.h>
29 #include <sound/version.h>
30 #include <sound/control.h>
31 #include <sound/initval.h>
32 #include <linux/kmod.h>
33 #include <linux/devfs_fs_kernel.h>
34 #include <linux/device.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_CLASSES("{sound}");
47 MODULE_SUPPORTED_DEVICE("sound");
48 MODULE_PARM(major, "i");
49 MODULE_PARM_DESC(major, "Major # for sound driver.");
50 MODULE_PARM_SYNTAX(major, "default:116,skill:devel");
51 MODULE_PARM(cards_limit, "i");
52 MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards.");
53 MODULE_PARM_SYNTAX(cards_limit, "default:8,skill:advanced");
54 MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR);
55 #ifdef CONFIG_DEVFS_FS
56 MODULE_PARM(device_mode, "i");
57 MODULE_PARM_DESC(device_mode, "Device file permission mask for devfs.");
58 MODULE_PARM_SYNTAX(device_mode, "default:0666,base:8");
60 MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR);
62 /* this one holds the actual max. card number currently available.
63 * as default, it's identical with cards_limit option. when more
64 * modules are loaded manually, this limit number increases, too.
68 static struct list_head snd_minors_hash[SNDRV_CARDS];
70 static DECLARE_MUTEX(sound_mutex);
72 extern struct class_simple *sound_class;
78 * snd_request_card - try to load the card module
79 * @card: the card number
81 * Tries to load the module "snd-card-X" for the given card number
82 * via KMOD. Returns immediately if already loaded.
84 void snd_request_card(int card)
88 if (! current->fs->root)
90 read_lock(&snd_card_rwlock);
91 locked = snd_cards_lock & (1 << card);
92 read_unlock(&snd_card_rwlock);
95 if (card < 0 || card >= cards_limit)
97 request_module("snd-card-%i", card);
100 static void snd_request_other(int minor)
104 if (! current->fs->root)
107 case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break;
108 case SNDRV_MINOR_TIMER: str = "snd-timer"; break;
114 #endif /* request_module support */
116 static snd_minor_t *snd_minor_search(int minor)
118 struct list_head *list;
121 list_for_each(list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]) {
122 mptr = list_entry(list, snd_minor_t, list);
123 if (mptr->number == minor)
129 static int snd_open(struct inode *inode, struct file *file)
131 int minor = iminor(inode);
132 int card = SNDRV_MINOR_CARD(minor);
133 int dev = SNDRV_MINOR_DEVICE(minor);
134 snd_minor_t *mptr = NULL;
135 struct file_operations *old_fops;
138 if (dev != SNDRV_MINOR_SEQUENCER && dev != SNDRV_MINOR_TIMER) {
139 if (snd_cards[card] == NULL) {
141 snd_request_card(card);
142 if (snd_cards[card] == NULL)
148 if ((mptr = snd_minor_search(minor)) == NULL)
149 snd_request_other(minor);
152 if (mptr == NULL && (mptr = snd_minor_search(minor)) == NULL)
154 old_fops = file->f_op;
155 file->f_op = fops_get(mptr->f_ops);
156 if (file->f_op->open)
157 err = file->f_op->open(inode, file);
159 fops_put(file->f_op);
160 file->f_op = fops_get(old_fops);
166 struct file_operations snd_fops =
168 .owner = THIS_MODULE,
172 static int snd_kernel_minor(int type, snd_card_t * card, int dev)
177 case SNDRV_DEVICE_TYPE_SEQUENCER:
178 case SNDRV_DEVICE_TYPE_TIMER:
181 case SNDRV_DEVICE_TYPE_CONTROL:
182 snd_assert(card != NULL, return -EINVAL);
183 minor = SNDRV_MINOR(card->number, type);
185 case SNDRV_DEVICE_TYPE_HWDEP:
186 case SNDRV_DEVICE_TYPE_RAWMIDI:
187 case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
188 case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
189 snd_assert(card != NULL, return -EINVAL);
190 minor = SNDRV_MINOR(card->number, type + dev);
195 snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
200 * snd_register_device - Register the ALSA device file for the card
201 * @type: the device type, SNDRV_DEVICE_TYPE_XXX
202 * @card: the card instance
203 * @dev: the device index
204 * @reg: the snd_minor_t record
205 * @name: the device file name
207 * Registers an ALSA device file for the given card.
208 * The operators have to be set in reg parameter.
210 * Retrurns zero if successful, or a negative error code on failure.
212 int snd_register_device(int type, snd_card_t * card, int dev, snd_minor_t * reg, const char *name)
214 int minor = snd_kernel_minor(type, card, dev);
216 struct device *device = NULL;
220 snd_assert(name, return -EINVAL);
221 preg = (snd_minor_t *)kmalloc(sizeof(snd_minor_t) + strlen(name) + 1, GFP_KERNEL);
225 preg->number = minor;
227 strcpy(preg->name, name);
229 if (snd_minor_search(minor)) {
234 list_add_tail(&preg->list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]);
235 if (strncmp(name, "controlC", 8) || card->number >= cards_limit) {
236 devfs_mk_cdev(MKDEV(major, minor), S_IFCHR | device_mode, "snd/%s", name);
239 class_simple_device_add(sound_class, MKDEV(major, minor), device, name);
247 * snd_unregister_device - unregister the device on the given card
248 * @type: the device type, SNDRV_DEVICE_TYPE_XXX
249 * @card: the card instance
250 * @dev: the device index
252 * Unregisters the device file already registered via
253 * snd_register_device().
255 * Returns zero if sucecessful, or a negative error code on failure
257 int snd_unregister_device(int type, snd_card_t * card, int dev)
259 int minor = snd_kernel_minor(type, card, dev);
265 if ((mptr = snd_minor_search(minor)) == NULL) {
270 if (strncmp(mptr->name, "controlC", 8) || card->number >= cards_limit) { /* created in sound.c */
271 devfs_remove("snd/%s", mptr->name);
272 class_simple_device_remove(MKDEV(major, minor));
275 list_del(&mptr->list);
285 static snd_info_entry_t *snd_minor_info_entry = NULL;
287 static void snd_minor_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
290 struct list_head *list;
294 for (card = 0; card < SNDRV_CARDS; card++) {
295 list_for_each(list, &snd_minors_hash[card]) {
296 mptr = list_entry(list, snd_minor_t, list);
297 if (SNDRV_MINOR_DEVICE(mptr->number) != SNDRV_MINOR_SEQUENCER) {
298 if ((device = mptr->device) >= 0)
299 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, device, mptr->comment);
301 snd_iprintf(buffer, "%3i: [%i] : %s\n", mptr->number, card, mptr->comment);
303 snd_iprintf(buffer, "%3i: : %s\n", mptr->number, mptr->comment);
310 int __init snd_minor_info_init(void)
312 snd_info_entry_t *entry;
314 entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
316 entry->c.text.read_size = PAGE_SIZE;
317 entry->c.text.read = snd_minor_info_read;
318 if (snd_info_register(entry) < 0) {
319 snd_info_free_entry(entry);
323 snd_minor_info_entry = entry;
327 int __exit snd_minor_info_done(void)
329 if (snd_minor_info_entry)
330 snd_info_unregister(snd_minor_info_entry);
338 static int __init alsa_sound_init(void)
341 #ifdef CONFIG_SND_OSSEMUL
347 snd_ecards_limit = cards_limit;
348 for (card = 0; card < SNDRV_CARDS; card++)
349 INIT_LIST_HEAD(&snd_minors_hash[card]);
350 #ifdef CONFIG_SND_OSSEMUL
351 if ((err = snd_oss_init_module()) < 0)
355 if (register_chrdev(major, "alsa", &snd_fops)) {
356 snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
360 #ifdef CONFIG_SND_DEBUG_MEMORY
363 if (snd_info_init() < 0) {
364 #ifdef CONFIG_SND_DEBUG_MEMORY
367 unregister_chrdev(major, "alsa");
371 #ifdef CONFIG_SND_OSSEMUL
372 snd_info_minor_register();
374 for (controlnum = 0; controlnum < cards_limit; controlnum++) {
375 devfs_mk_cdev(MKDEV(major, controlnum<<5), S_IFCHR | device_mode, "snd/controlC%d", controlnum);
376 class_simple_device_add(sound_class, MKDEV(major, controlnum<<5), NULL, "controlC%d", controlnum);
379 printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n");
384 static void __exit alsa_sound_exit(void)
388 for (controlnum = 0; controlnum < cards_limit; controlnum++) {
389 devfs_remove("snd/controlC%d", controlnum);
390 class_simple_device_remove(MKDEV(major, controlnum<<5));
393 #ifdef CONFIG_SND_OSSEMUL
394 snd_info_minor_unregister();
397 #ifdef CONFIG_SND_DEBUG_MEMORY
400 if (unregister_chrdev(major, "alsa") != 0)
401 snd_printk(KERN_ERR "unable to unregister major device number %d\n", major);
405 module_init(alsa_sound_init)
406 module_exit(alsa_sound_exit)
410 /* format is: snd=major,cards_limit[,device_mode] */
412 static int __init alsa_sound_setup(char *str)
414 (void)(get_option(&str,&major) == 2 &&
415 get_option(&str,&cards_limit) == 2);
416 #ifdef CONFIG_DEVFS_FS
417 (void)(get_option(&str,&device_mode) == 2);
422 __setup("snd=", alsa_sound_setup);
424 #endif /* ifndef MODULE */
427 EXPORT_SYMBOL(snd_major);
428 EXPORT_SYMBOL(snd_ecards_limit);
429 #if defined(CONFIG_KMOD)
430 EXPORT_SYMBOL(snd_request_card);
432 EXPORT_SYMBOL(snd_register_device);
433 EXPORT_SYMBOL(snd_unregister_device);
434 #if defined(CONFIG_SND_OSSEMUL)
435 EXPORT_SYMBOL(snd_register_oss_device);
436 EXPORT_SYMBOL(snd_unregister_oss_device);
439 #ifdef CONFIG_SND_DEBUG_MEMORY
440 EXPORT_SYMBOL(snd_hidden_kmalloc);
441 EXPORT_SYMBOL(snd_hidden_kfree);
442 EXPORT_SYMBOL(snd_hidden_vmalloc);
443 EXPORT_SYMBOL(snd_hidden_vfree);
444 EXPORT_SYMBOL(_snd_magic_kmalloc);
445 EXPORT_SYMBOL(_snd_magic_kcalloc);
446 EXPORT_SYMBOL(snd_magic_kfree);
448 EXPORT_SYMBOL(snd_kcalloc);
449 EXPORT_SYMBOL(snd_kmalloc_strdup);
450 EXPORT_SYMBOL(copy_to_user_fromio);
451 EXPORT_SYMBOL(copy_from_user_toio);
453 EXPORT_SYMBOL(snd_cards_count);
454 EXPORT_SYMBOL(snd_cards);
455 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
456 EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
458 EXPORT_SYMBOL(snd_card_new);
459 EXPORT_SYMBOL(snd_card_disconnect);
460 EXPORT_SYMBOL(snd_card_free);
461 EXPORT_SYMBOL(snd_card_free_in_thread);
462 EXPORT_SYMBOL(snd_card_register);
463 EXPORT_SYMBOL(snd_component_add);
464 EXPORT_SYMBOL(snd_card_file_add);
465 EXPORT_SYMBOL(snd_card_file_remove);
467 EXPORT_SYMBOL(snd_power_wait);
470 EXPORT_SYMBOL(snd_device_new);
471 EXPORT_SYMBOL(snd_device_register);
472 EXPORT_SYMBOL(snd_device_free);
473 EXPORT_SYMBOL(snd_device_free_all);
476 EXPORT_SYMBOL(snd_dma_program);
477 EXPORT_SYMBOL(snd_dma_disable);
478 EXPORT_SYMBOL(snd_dma_pointer);
481 #ifdef CONFIG_PROC_FS
482 EXPORT_SYMBOL(snd_seq_root);
483 EXPORT_SYMBOL(snd_create_proc_entry);
484 EXPORT_SYMBOL(snd_remove_proc_entry);
485 EXPORT_SYMBOL(snd_iprintf);
486 EXPORT_SYMBOL(snd_info_get_line);
487 EXPORT_SYMBOL(snd_info_get_str);
488 EXPORT_SYMBOL(snd_info_create_module_entry);
489 EXPORT_SYMBOL(snd_info_create_card_entry);
490 EXPORT_SYMBOL(snd_info_free_entry);
491 EXPORT_SYMBOL(snd_info_register);
492 EXPORT_SYMBOL(snd_info_unregister);
493 EXPORT_SYMBOL(snd_card_proc_new);
496 #if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS)
497 EXPORT_SYMBOL(snd_oss_info_register);
500 EXPORT_SYMBOL(snd_ctl_new);
501 EXPORT_SYMBOL(snd_ctl_new1);
502 EXPORT_SYMBOL(snd_ctl_free_one);
503 EXPORT_SYMBOL(snd_ctl_add);
504 EXPORT_SYMBOL(snd_ctl_remove);
505 EXPORT_SYMBOL(snd_ctl_remove_id);
506 EXPORT_SYMBOL(snd_ctl_rename_id);
507 EXPORT_SYMBOL(snd_ctl_find_numid);
508 EXPORT_SYMBOL(snd_ctl_find_id);
509 EXPORT_SYMBOL(snd_ctl_notify);
510 EXPORT_SYMBOL(snd_ctl_register_ioctl);
511 EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
513 EXPORT_SYMBOL(snd_task_name);
514 #ifdef CONFIG_SND_VERBOSE_PRINTK
515 EXPORT_SYMBOL(snd_verbose_printk);
517 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_VERBOSE_PRINTK)
518 EXPORT_SYMBOL(snd_verbose_printd);
521 #ifdef CONFIG_SND_DEBUG_MEMORY
522 EXPORT_SYMBOL(snd_wrapper_kmalloc);
523 EXPORT_SYMBOL(snd_wrapper_kfree);
524 EXPORT_SYMBOL(snd_wrapper_vmalloc);
525 EXPORT_SYMBOL(snd_wrapper_vfree);