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_param(major
, int, 0444);
48 MODULE_PARM_DESC(major
, "Major # for sound driver.");
49 module_param(cards_limit
, int, 0444);
50 MODULE_PARM_DESC(cards_limit
, "Count of auto-loadable soundcards.");
51 MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR
);
52 #ifdef CONFIG_DEVFS_FS
53 module_param(device_mode
, int, 0444);
54 MODULE_PARM_DESC(device_mode
, "Device file permission mask for devfs.");
56 MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR
);
58 /* this one holds the actual max. card number currently available.
59 * as default, it's identical with cards_limit option. when more
60 * modules are loaded manually, this limit number increases, too.
64 static struct list_head snd_minors_hash
[SNDRV_CARDS
];
66 static DECLARE_MUTEX(sound_mutex
);
68 extern struct class_simple
*sound_class
;
74 * snd_request_card - try to load the card module
75 * @card: the card number
77 * Tries to load the module "snd-card-X" for the given card number
78 * via KMOD. Returns immediately if already loaded.
80 void snd_request_card(int card
)
84 if (! current
->fs
->root
)
86 read_lock(&snd_card_rwlock
);
87 locked
= snd_cards_lock
& (1 << card
);
88 read_unlock(&snd_card_rwlock
);
91 if (card
< 0 || card
>= cards_limit
)
93 request_module("snd-card-%i", card
);
96 static void snd_request_other(int minor
)
100 if (! current
->fs
->root
)
103 case SNDRV_MINOR_SEQUENCER
: str
= "snd-seq"; break;
104 case SNDRV_MINOR_TIMER
: str
= "snd-timer"; break;
110 #endif /* request_module support */
112 static snd_minor_t
*snd_minor_search(int minor
)
114 struct list_head
*list
;
117 list_for_each(list
, &snd_minors_hash
[SNDRV_MINOR_CARD(minor
)]) {
118 mptr
= list_entry(list
, snd_minor_t
, list
);
119 if (mptr
->number
== minor
)
125 static int snd_open(struct inode
*inode
, struct file
*file
)
127 int minor
= iminor(inode
);
128 int card
= SNDRV_MINOR_CARD(minor
);
129 int dev
= SNDRV_MINOR_DEVICE(minor
);
130 snd_minor_t
*mptr
= NULL
;
131 struct file_operations
*old_fops
;
134 if (dev
!= SNDRV_MINOR_SEQUENCER
&& dev
!= SNDRV_MINOR_TIMER
) {
135 if (snd_cards
[card
] == NULL
) {
137 snd_request_card(card
);
138 if (snd_cards
[card
] == NULL
)
144 if ((mptr
= snd_minor_search(minor
)) == NULL
)
145 snd_request_other(minor
);
148 if (mptr
== NULL
&& (mptr
= snd_minor_search(minor
)) == NULL
)
150 old_fops
= file
->f_op
;
151 file
->f_op
= fops_get(mptr
->f_ops
);
152 if (file
->f_op
->open
)
153 err
= file
->f_op
->open(inode
, file
);
155 fops_put(file
->f_op
);
156 file
->f_op
= fops_get(old_fops
);
162 struct file_operations snd_fops
=
164 .owner
= THIS_MODULE
,
168 static int snd_kernel_minor(int type
, snd_card_t
* card
, int dev
)
173 case SNDRV_DEVICE_TYPE_SEQUENCER
:
174 case SNDRV_DEVICE_TYPE_TIMER
:
177 case SNDRV_DEVICE_TYPE_CONTROL
:
178 snd_assert(card
!= NULL
, return -EINVAL
);
179 minor
= SNDRV_MINOR(card
->number
, type
);
181 case SNDRV_DEVICE_TYPE_HWDEP
:
182 case SNDRV_DEVICE_TYPE_RAWMIDI
:
183 case SNDRV_DEVICE_TYPE_PCM_PLAYBACK
:
184 case SNDRV_DEVICE_TYPE_PCM_CAPTURE
:
185 snd_assert(card
!= NULL
, return -EINVAL
);
186 minor
= SNDRV_MINOR(card
->number
, type
+ dev
);
191 snd_assert(minor
>= 0 && minor
< SNDRV_OS_MINORS
, return -EINVAL
);
196 * snd_register_device - Register the ALSA device file for the card
197 * @type: the device type, SNDRV_DEVICE_TYPE_XXX
198 * @card: the card instance
199 * @dev: the device index
200 * @reg: the snd_minor_t record
201 * @name: the device file name
203 * Registers an ALSA device file for the given card.
204 * The operators have to be set in reg parameter.
206 * Retrurns zero if successful, or a negative error code on failure.
208 int snd_register_device(int type
, snd_card_t
* card
, int dev
, snd_minor_t
* reg
, const char *name
)
210 int minor
= snd_kernel_minor(type
, card
, dev
);
212 struct device
*device
= NULL
;
216 snd_assert(name
, return -EINVAL
);
217 preg
= (snd_minor_t
*)kmalloc(sizeof(snd_minor_t
) + strlen(name
) + 1, GFP_KERNEL
);
221 preg
->number
= minor
;
223 strcpy(preg
->name
, name
);
225 if (snd_minor_search(minor
)) {
230 list_add_tail(&preg
->list
, &snd_minors_hash
[SNDRV_MINOR_CARD(minor
)]);
231 if (strncmp(name
, "controlC", 8) || card
->number
>= cards_limit
) {
232 devfs_mk_cdev(MKDEV(major
, minor
), S_IFCHR
| device_mode
, "snd/%s", name
);
235 class_simple_device_add(sound_class
, MKDEV(major
, minor
), device
, name
);
243 * snd_unregister_device - unregister the device on the given card
244 * @type: the device type, SNDRV_DEVICE_TYPE_XXX
245 * @card: the card instance
246 * @dev: the device index
248 * Unregisters the device file already registered via
249 * snd_register_device().
251 * Returns zero if sucecessful, or a negative error code on failure
253 int snd_unregister_device(int type
, snd_card_t
* card
, int dev
)
255 int minor
= snd_kernel_minor(type
, card
, dev
);
261 if ((mptr
= snd_minor_search(minor
)) == NULL
) {
266 if (strncmp(mptr
->name
, "controlC", 8) || card
->number
>= cards_limit
) { /* created in sound.c */
267 devfs_remove("snd/%s", mptr
->name
);
268 class_simple_device_remove(MKDEV(major
, minor
));
271 list_del(&mptr
->list
);
281 static snd_info_entry_t
*snd_minor_info_entry
= NULL
;
283 static void snd_minor_info_read(snd_info_entry_t
*entry
, snd_info_buffer_t
* buffer
)
286 struct list_head
*list
;
290 for (card
= 0; card
< SNDRV_CARDS
; card
++) {
291 list_for_each(list
, &snd_minors_hash
[card
]) {
292 mptr
= list_entry(list
, snd_minor_t
, list
);
293 if (SNDRV_MINOR_DEVICE(mptr
->number
) != SNDRV_MINOR_SEQUENCER
) {
294 if ((device
= mptr
->device
) >= 0)
295 snd_iprintf(buffer
, "%3i: [%i-%2i]: %s\n", mptr
->number
, card
, device
, mptr
->comment
);
297 snd_iprintf(buffer
, "%3i: [%i] : %s\n", mptr
->number
, card
, mptr
->comment
);
299 snd_iprintf(buffer
, "%3i: : %s\n", mptr
->number
, mptr
->comment
);
306 int __init
snd_minor_info_init(void)
308 snd_info_entry_t
*entry
;
310 entry
= snd_info_create_module_entry(THIS_MODULE
, "devices", NULL
);
312 entry
->c
.text
.read_size
= PAGE_SIZE
;
313 entry
->c
.text
.read
= snd_minor_info_read
;
314 if (snd_info_register(entry
) < 0) {
315 snd_info_free_entry(entry
);
319 snd_minor_info_entry
= entry
;
323 int __exit
snd_minor_info_done(void)
325 if (snd_minor_info_entry
)
326 snd_info_unregister(snd_minor_info_entry
);
334 static int __init
alsa_sound_init(void)
341 snd_ecards_limit
= cards_limit
;
342 for (card
= 0; card
< SNDRV_CARDS
; card
++)
343 INIT_LIST_HEAD(&snd_minors_hash
[card
]);
344 if ((err
= snd_oss_init_module()) < 0)
347 if (register_chrdev(major
, "alsa", &snd_fops
)) {
348 snd_printk(KERN_ERR
"unable to register native major device number %d\n", major
);
353 if (snd_info_init() < 0) {
355 unregister_chrdev(major
, "alsa");
359 snd_info_minor_register();
360 for (controlnum
= 0; controlnum
< cards_limit
; controlnum
++) {
361 devfs_mk_cdev(MKDEV(major
, controlnum
<<5), S_IFCHR
| device_mode
, "snd/controlC%d", controlnum
);
362 class_simple_device_add(sound_class
, MKDEV(major
, controlnum
<<5), NULL
, "controlC%d", controlnum
);
365 printk(KERN_INFO
"Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE
".\n");
370 static void __exit
alsa_sound_exit(void)
374 for (controlnum
= 0; controlnum
< cards_limit
; controlnum
++) {
375 devfs_remove("snd/controlC%d", controlnum
);
376 class_simple_device_remove(MKDEV(major
, controlnum
<<5));
379 snd_info_minor_unregister();
382 if (unregister_chrdev(major
, "alsa") != 0)
383 snd_printk(KERN_ERR
"unable to unregister major device number %d\n", major
);
387 module_init(alsa_sound_init
)
388 module_exit(alsa_sound_exit
)
391 EXPORT_SYMBOL(snd_major
);
392 EXPORT_SYMBOL(snd_ecards_limit
);
393 #if defined(CONFIG_KMOD)
394 EXPORT_SYMBOL(snd_request_card
);
396 EXPORT_SYMBOL(snd_register_device
);
397 EXPORT_SYMBOL(snd_unregister_device
);
398 #if defined(CONFIG_SND_OSSEMUL)
399 EXPORT_SYMBOL(snd_register_oss_device
);
400 EXPORT_SYMBOL(snd_unregister_oss_device
);
403 #ifdef CONFIG_SND_DEBUG_MEMORY
404 EXPORT_SYMBOL(snd_hidden_kmalloc
);
405 EXPORT_SYMBOL(snd_hidden_kcalloc
);
406 EXPORT_SYMBOL(snd_hidden_kfree
);
407 EXPORT_SYMBOL(snd_hidden_vmalloc
);
408 EXPORT_SYMBOL(snd_hidden_vfree
);
410 EXPORT_SYMBOL(snd_kmalloc_strdup
);
411 EXPORT_SYMBOL(copy_to_user_fromio
);
412 EXPORT_SYMBOL(copy_from_user_toio
);
414 EXPORT_SYMBOL(snd_cards_count
);
415 EXPORT_SYMBOL(snd_cards
);
416 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
417 EXPORT_SYMBOL(snd_mixer_oss_notify_callback
);
419 EXPORT_SYMBOL(snd_card_new
);
420 EXPORT_SYMBOL(snd_card_disconnect
);
421 EXPORT_SYMBOL(snd_card_free
);
422 EXPORT_SYMBOL(snd_card_free_in_thread
);
423 EXPORT_SYMBOL(snd_card_register
);
424 EXPORT_SYMBOL(snd_component_add
);
425 EXPORT_SYMBOL(snd_card_file_add
);
426 EXPORT_SYMBOL(snd_card_file_remove
);
428 EXPORT_SYMBOL(snd_power_wait
);
429 EXPORT_SYMBOL(snd_card_set_pm_callback
);
430 EXPORT_SYMBOL(snd_card_set_dev_pm_callback
);
432 EXPORT_SYMBOL(snd_card_pci_suspend
);
433 EXPORT_SYMBOL(snd_card_pci_resume
);
437 EXPORT_SYMBOL(snd_device_new
);
438 EXPORT_SYMBOL(snd_device_register
);
439 EXPORT_SYMBOL(snd_device_free
);
440 EXPORT_SYMBOL(snd_device_free_all
);
443 EXPORT_SYMBOL(snd_dma_program
);
444 EXPORT_SYMBOL(snd_dma_disable
);
445 EXPORT_SYMBOL(snd_dma_pointer
);
448 #ifdef CONFIG_PROC_FS
449 EXPORT_SYMBOL(snd_seq_root
);
450 EXPORT_SYMBOL(snd_create_proc_entry
);
451 EXPORT_SYMBOL(snd_remove_proc_entry
);
452 EXPORT_SYMBOL(snd_iprintf
);
453 EXPORT_SYMBOL(snd_info_get_line
);
454 EXPORT_SYMBOL(snd_info_get_str
);
455 EXPORT_SYMBOL(snd_info_create_module_entry
);
456 EXPORT_SYMBOL(snd_info_create_card_entry
);
457 EXPORT_SYMBOL(snd_info_free_entry
);
458 EXPORT_SYMBOL(snd_info_register
);
459 EXPORT_SYMBOL(snd_info_unregister
);
460 EXPORT_SYMBOL(snd_card_proc_new
);
463 #if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS)
464 EXPORT_SYMBOL(snd_oss_info_register
);
467 EXPORT_SYMBOL(snd_ctl_new
);
468 EXPORT_SYMBOL(snd_ctl_new1
);
469 EXPORT_SYMBOL(snd_ctl_free_one
);
470 EXPORT_SYMBOL(snd_ctl_add
);
471 EXPORT_SYMBOL(snd_ctl_remove
);
472 EXPORT_SYMBOL(snd_ctl_remove_id
);
473 EXPORT_SYMBOL(snd_ctl_rename_id
);
474 EXPORT_SYMBOL(snd_ctl_find_numid
);
475 EXPORT_SYMBOL(snd_ctl_find_id
);
476 EXPORT_SYMBOL(snd_ctl_notify
);
477 EXPORT_SYMBOL(snd_ctl_register_ioctl
);
478 EXPORT_SYMBOL(snd_ctl_unregister_ioctl
);
480 EXPORT_SYMBOL(snd_task_name
);
481 #ifdef CONFIG_SND_VERBOSE_PRINTK
482 EXPORT_SYMBOL(snd_verbose_printk
);
484 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_VERBOSE_PRINTK)
485 EXPORT_SYMBOL(snd_verbose_printd
);
488 #ifdef CONFIG_SND_DEBUG_MEMORY
489 EXPORT_SYMBOL(snd_wrapper_kmalloc
);
490 EXPORT_SYMBOL(snd_wrapper_kfree
);
491 EXPORT_SYMBOL(snd_wrapper_vmalloc
);
492 EXPORT_SYMBOL(snd_wrapper_vfree
);