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>
35 #include <linux/device.h>
37 #define SNDRV_OS_MINORS 256
39 static int major = CONFIG_SND_MAJOR;
41 static int cards_limit = 1;
42 static int device_mode = S_IFCHR | S_IRUGO | S_IWUGO;
44 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
45 MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards.");
46 MODULE_LICENSE("GPL");
47 MODULE_CLASSES("{sound}");
48 MODULE_SUPPORTED_DEVICE("sound");
49 module_param(major, int, 0444);
50 MODULE_PARM_DESC(major, "Major # for sound driver.");
51 MODULE_PARM_SYNTAX(major, "default:116,skill:devel");
52 module_param(cards_limit, int, 0444);
53 MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards.");
54 MODULE_PARM_SYNTAX(cards_limit, "default:8,skill:advanced");
55 MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR);
56 #ifdef CONFIG_DEVFS_FS
57 module_param(device_mode, int, 0444);
58 MODULE_PARM_DESC(device_mode, "Device file permission mask for devfs.");
59 MODULE_PARM_SYNTAX(device_mode, "default:0666,base:8");
61 MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR);
63 /* this one holds the actual max. card number currently available.
64 * as default, it's identical with cards_limit option. when more
65 * modules are loaded manually, this limit number increases, too.
69 static struct list_head snd_minors_hash[SNDRV_CARDS];
71 static DECLARE_MUTEX(sound_mutex);
73 extern struct class_simple *sound_class;
79 * snd_request_card - try to load the card module
80 * @card: the card number
82 * Tries to load the module "snd-card-X" for the given card number
83 * via KMOD. Returns immediately if already loaded.
85 void snd_request_card(int card)
89 if (! current->fs->root)
91 read_lock(&snd_card_rwlock);
92 locked = snd_cards_lock & (1 << card);
93 read_unlock(&snd_card_rwlock);
96 if (card < 0 || card >= cards_limit)
98 request_module("snd-card-%i", card);
101 static void snd_request_other(int minor)
105 if (! current->fs->root)
108 case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break;
109 case SNDRV_MINOR_TIMER: str = "snd-timer"; break;
115 #endif /* request_module support */
117 static snd_minor_t *snd_minor_search(int minor)
119 struct list_head *list;
122 list_for_each(list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]) {
123 mptr = list_entry(list, snd_minor_t, list);
124 if (mptr->number == minor)
130 static int snd_open(struct inode *inode, struct file *file)
132 int minor = iminor(inode);
133 int card = SNDRV_MINOR_CARD(minor);
134 int dev = SNDRV_MINOR_DEVICE(minor);
135 snd_minor_t *mptr = NULL;
136 struct file_operations *old_fops;
139 if (dev != SNDRV_MINOR_SEQUENCER && dev != SNDRV_MINOR_TIMER) {
140 if (snd_cards[card] == NULL) {
142 snd_request_card(card);
143 if (snd_cards[card] == NULL)
149 if ((mptr = snd_minor_search(minor)) == NULL)
150 snd_request_other(minor);
153 if (mptr == NULL && (mptr = snd_minor_search(minor)) == NULL)
155 old_fops = file->f_op;
156 file->f_op = fops_get(mptr->f_ops);
157 if (file->f_op->open)
158 err = file->f_op->open(inode, file);
160 fops_put(file->f_op);
161 file->f_op = fops_get(old_fops);
167 struct file_operations snd_fops =
169 .owner = THIS_MODULE,
173 static int snd_kernel_minor(int type, snd_card_t * card, int dev)
178 case SNDRV_DEVICE_TYPE_SEQUENCER:
179 case SNDRV_DEVICE_TYPE_TIMER:
182 case SNDRV_DEVICE_TYPE_CONTROL:
183 snd_assert(card != NULL, return -EINVAL);
184 minor = SNDRV_MINOR(card->number, type);
186 case SNDRV_DEVICE_TYPE_HWDEP:
187 case SNDRV_DEVICE_TYPE_RAWMIDI:
188 case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
189 case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
190 snd_assert(card != NULL, return -EINVAL);
191 minor = SNDRV_MINOR(card->number, type + dev);
196 snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
201 * snd_register_device - Register the ALSA device file for the card
202 * @type: the device type, SNDRV_DEVICE_TYPE_XXX
203 * @card: the card instance
204 * @dev: the device index
205 * @reg: the snd_minor_t record
206 * @name: the device file name
208 * Registers an ALSA device file for the given card.
209 * The operators have to be set in reg parameter.
211 * Retrurns zero if successful, or a negative error code on failure.
213 int snd_register_device(int type, snd_card_t * card, int dev, snd_minor_t * reg, const char *name)
215 int minor = snd_kernel_minor(type, card, dev);
217 struct device *device = NULL;
221 snd_assert(name, return -EINVAL);
222 preg = (snd_minor_t *)kmalloc(sizeof(snd_minor_t) + strlen(name) + 1, GFP_KERNEL);
226 preg->number = minor;
228 strcpy(preg->name, name);
230 if (snd_minor_search(minor)) {
235 list_add_tail(&preg->list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]);
236 if (strncmp(name, "controlC", 8) || card->number >= cards_limit) {
237 devfs_mk_cdev(MKDEV(major, minor), S_IFCHR | device_mode, "snd/%s", name);
240 class_simple_device_add(sound_class, MKDEV(major, minor), device, name);
248 * snd_unregister_device - unregister the device on the given card
249 * @type: the device type, SNDRV_DEVICE_TYPE_XXX
250 * @card: the card instance
251 * @dev: the device index
253 * Unregisters the device file already registered via
254 * snd_register_device().
256 * Returns zero if sucecessful, or a negative error code on failure
258 int snd_unregister_device(int type, snd_card_t * card, int dev)
260 int minor = snd_kernel_minor(type, card, dev);
266 if ((mptr = snd_minor_search(minor)) == NULL) {
271 if (strncmp(mptr->name, "controlC", 8) || card->number >= cards_limit) { /* created in sound.c */
272 devfs_remove("snd/%s", mptr->name);
273 class_simple_device_remove(MKDEV(major, minor));
276 list_del(&mptr->list);
286 static snd_info_entry_t *snd_minor_info_entry = NULL;
288 static void snd_minor_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
291 struct list_head *list;
295 for (card = 0; card < SNDRV_CARDS; card++) {
296 list_for_each(list, &snd_minors_hash[card]) {
297 mptr = list_entry(list, snd_minor_t, list);
298 if (SNDRV_MINOR_DEVICE(mptr->number) != SNDRV_MINOR_SEQUENCER) {
299 if ((device = mptr->device) >= 0)
300 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, device, mptr->comment);
302 snd_iprintf(buffer, "%3i: [%i] : %s\n", mptr->number, card, mptr->comment);
304 snd_iprintf(buffer, "%3i: : %s\n", mptr->number, mptr->comment);
311 int __init snd_minor_info_init(void)
313 snd_info_entry_t *entry;
315 entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
317 entry->c.text.read_size = PAGE_SIZE;
318 entry->c.text.read = snd_minor_info_read;
319 if (snd_info_register(entry) < 0) {
320 snd_info_free_entry(entry);
324 snd_minor_info_entry = entry;
328 int __exit snd_minor_info_done(void)
330 if (snd_minor_info_entry)
331 snd_info_unregister(snd_minor_info_entry);
339 static int __init alsa_sound_init(void)
342 #ifdef CONFIG_SND_OSSEMUL
348 snd_ecards_limit = cards_limit;
349 for (card = 0; card < SNDRV_CARDS; card++)
350 INIT_LIST_HEAD(&snd_minors_hash[card]);
351 #ifdef CONFIG_SND_OSSEMUL
352 if ((err = snd_oss_init_module()) < 0)
356 if (register_chrdev(major, "alsa", &snd_fops)) {
357 snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
361 #ifdef CONFIG_SND_DEBUG_MEMORY
364 if (snd_info_init() < 0) {
365 #ifdef CONFIG_SND_DEBUG_MEMORY
368 unregister_chrdev(major, "alsa");
372 #ifdef CONFIG_SND_OSSEMUL
373 snd_info_minor_register();
375 for (controlnum = 0; controlnum < cards_limit; controlnum++) {
376 devfs_mk_cdev(MKDEV(major, controlnum<<5), S_IFCHR | device_mode, "snd/controlC%d", controlnum);
377 class_simple_device_add(sound_class, MKDEV(major, controlnum<<5), NULL, "controlC%d", controlnum);
380 printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n");
385 static void __exit alsa_sound_exit(void)
389 for (controlnum = 0; controlnum < cards_limit; controlnum++) {
390 devfs_remove("snd/controlC%d", controlnum);
391 class_simple_device_remove(MKDEV(major, controlnum<<5));
394 #ifdef CONFIG_SND_OSSEMUL
395 snd_info_minor_unregister();
398 #ifdef CONFIG_SND_DEBUG_MEMORY
401 if (unregister_chrdev(major, "alsa") != 0)
402 snd_printk(KERN_ERR "unable to unregister major device number %d\n", major);
406 module_init(alsa_sound_init)
407 module_exit(alsa_sound_exit)
411 /* format is: snd=major,cards_limit[,device_mode] */
413 static int __init alsa_sound_setup(char *str)
415 (void)(get_option(&str,&major) == 2 &&
416 get_option(&str,&cards_limit) == 2);
417 #ifdef CONFIG_DEVFS_FS
418 (void)(get_option(&str,&device_mode) == 2);
423 __setup("snd=", alsa_sound_setup);
425 #endif /* ifndef MODULE */
428 EXPORT_SYMBOL(snd_major);
429 EXPORT_SYMBOL(snd_ecards_limit);
430 #if defined(CONFIG_KMOD)
431 EXPORT_SYMBOL(snd_request_card);
433 EXPORT_SYMBOL(snd_register_device);
434 EXPORT_SYMBOL(snd_unregister_device);
435 #if defined(CONFIG_SND_OSSEMUL)
436 EXPORT_SYMBOL(snd_register_oss_device);
437 EXPORT_SYMBOL(snd_unregister_oss_device);
440 #ifdef CONFIG_SND_DEBUG_MEMORY
441 EXPORT_SYMBOL(snd_hidden_kmalloc);
442 EXPORT_SYMBOL(snd_hidden_kfree);
443 EXPORT_SYMBOL(snd_hidden_vmalloc);
444 EXPORT_SYMBOL(snd_hidden_vfree);
445 EXPORT_SYMBOL(_snd_magic_kmalloc);
446 EXPORT_SYMBOL(_snd_magic_kcalloc);
447 EXPORT_SYMBOL(snd_magic_kfree);
449 EXPORT_SYMBOL(snd_kcalloc);
450 EXPORT_SYMBOL(snd_kmalloc_strdup);
451 EXPORT_SYMBOL(copy_to_user_fromio);
452 EXPORT_SYMBOL(copy_from_user_toio);
454 EXPORT_SYMBOL(snd_cards_count);
455 EXPORT_SYMBOL(snd_cards);
456 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
457 EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
459 EXPORT_SYMBOL(snd_card_new);
460 EXPORT_SYMBOL(snd_card_disconnect);
461 EXPORT_SYMBOL(snd_card_free);
462 EXPORT_SYMBOL(snd_card_free_in_thread);
463 EXPORT_SYMBOL(snd_card_register);
464 EXPORT_SYMBOL(snd_component_add);
465 EXPORT_SYMBOL(snd_card_file_add);
466 EXPORT_SYMBOL(snd_card_file_remove);
468 EXPORT_SYMBOL(snd_power_wait);
469 EXPORT_SYMBOL(snd_card_set_pm_callback);
470 EXPORT_SYMBOL(snd_card_set_dev_pm_callback);
472 EXPORT_SYMBOL(snd_card_pci_suspend);
473 EXPORT_SYMBOL(snd_card_pci_resume);
477 EXPORT_SYMBOL(snd_device_new);
478 EXPORT_SYMBOL(snd_device_register);
479 EXPORT_SYMBOL(snd_device_free);
480 EXPORT_SYMBOL(snd_device_free_all);
483 EXPORT_SYMBOL(snd_dma_program);
484 EXPORT_SYMBOL(snd_dma_disable);
485 EXPORT_SYMBOL(snd_dma_pointer);
488 #ifdef CONFIG_PROC_FS
489 EXPORT_SYMBOL(snd_seq_root);
490 EXPORT_SYMBOL(snd_create_proc_entry);
491 EXPORT_SYMBOL(snd_remove_proc_entry);
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_task_name);
521 #ifdef CONFIG_SND_VERBOSE_PRINTK
522 EXPORT_SYMBOL(snd_verbose_printk);
524 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_VERBOSE_PRINTK)
525 EXPORT_SYMBOL(snd_verbose_printd);
528 #ifdef CONFIG_SND_DEBUG_MEMORY
529 EXPORT_SYMBOL(snd_wrapper_kmalloc);
530 EXPORT_SYMBOL(snd_wrapper_kfree);
531 EXPORT_SYMBOL(snd_wrapper_vmalloc);
532 EXPORT_SYMBOL(snd_wrapper_vfree);