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[SPARC64]: Fix flush_tsb_user() on SUN4V.
[linux-2.6/openmoko-kernel/knife-kernel.git] / sound / core / control.c
blob0c29679a8576b0dee6d913c5282f72d02fbd1d78
1 /*
2 * Routines for driver control interface
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/threads.h>
24 #include <linux/interrupt.h>
25 #include <linux/smp_lock.h>
26 #include <linux/slab.h>
27 #include <linux/vmalloc.h>
28 #include <linux/time.h>
29 #include <sound/core.h>
30 #include <sound/minors.h>
31 #include <sound/info.h>
32 #include <sound/control.h>
33
34 /* max number of user-defined controls */
35 #define MAX_USER_CONTROLS 32
36
37 struct snd_kctl_ioctl {
38 struct list_head list; /* list of all ioctls */
39 snd_kctl_ioctl_func_t fioctl;
40 };
41
42 static DECLARE_RWSEM(snd_ioctl_rwsem);
43 static LIST_HEAD(snd_control_ioctls);
44 #ifdef CONFIG_COMPAT
45 static LIST_HEAD(snd_control_compat_ioctls);
46 #endif
47
48 static int snd_ctl_open(struct inode *inode, struct file *file)
49 {
50 unsigned long flags;
51 struct snd_card *card;
52 struct snd_ctl_file *ctl;
53 int err;
54
55 card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL);
56 if (!card) {
57 err = -ENODEV;
58 goto __error1;
59 }
60 err = snd_card_file_add(card, file);
61 if (err < 0) {
62 err = -ENODEV;
63 goto __error1;
64 }
65 if (!try_module_get(card->module)) {
66 err = -EFAULT;
67 goto __error2;
68 }
69 ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
70 if (ctl == NULL) {
71 err = -ENOMEM;
72 goto __error;
73 }
74 INIT_LIST_HEAD(&ctl->events);
75 init_waitqueue_head(&ctl->change_sleep);
76 spin_lock_init(&ctl->read_lock);
77 ctl->card = card;
78 ctl->pid = current->pid;
79 file->private_data = ctl;
80 write_lock_irqsave(&card->ctl_files_rwlock, flags);
81 list_add_tail(&ctl->list, &card->ctl_files);
82 write_unlock_irqrestore(&card->ctl_files_rwlock, flags);
83 return 0;
84
85 __error:
86 module_put(card->module);
87 __error2:
88 snd_card_file_remove(card, file);
89 __error1:
90 return err;
91 }
92
93 static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl)
94 {
95 struct snd_kctl_event *cread;
96
97 spin_lock(&ctl->read_lock);
98 while (!list_empty(&ctl->events)) {
99 cread = snd_kctl_event(ctl->events.next);
100 list_del(&cread->list);
101 kfree(cread);
102 }
103 spin_unlock(&ctl->read_lock);
104 }
105
106 static int snd_ctl_release(struct inode *inode, struct file *file)
107 {
108 unsigned long flags;
109 struct list_head *list;
110 struct snd_card *card;
111 struct snd_ctl_file *ctl;
112 struct snd_kcontrol *control;
113 unsigned int idx;
114
115 ctl = file->private_data;
116 fasync_helper(-1, file, 0, &ctl->fasync);
117 file->private_data = NULL;
118 card = ctl->card;
119 write_lock_irqsave(&card->ctl_files_rwlock, flags);
120 list_del(&ctl->list);
121 write_unlock_irqrestore(&card->ctl_files_rwlock, flags);
122 down_write(&card->controls_rwsem);
123 list_for_each(list, &card->controls) {
124 control = snd_kcontrol(list);
125 for (idx = 0; idx < control->count; idx++)
126 if (control->vd[idx].owner == ctl)
127 control->vd[idx].owner = NULL;
128 }
129 up_write(&card->controls_rwsem);
130 snd_ctl_empty_read_queue(ctl);
131 kfree(ctl);
132 module_put(card->module);
133 snd_card_file_remove(card, file);
134 return 0;
135 }
136
137 void snd_ctl_notify(struct snd_card *card, unsigned int mask,
138 struct snd_ctl_elem_id *id)
139 {
140 unsigned long flags;
141 struct list_head *flist;
142 struct snd_ctl_file *ctl;
143 struct snd_kctl_event *ev;
144
145 snd_assert(card != NULL && id != NULL, return);
146 read_lock(&card->ctl_files_rwlock);
147 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
148 card->mixer_oss_change_count++;
149 #endif
150 list_for_each(flist, &card->ctl_files) {
151 struct list_head *elist;
152 ctl = snd_ctl_file(flist);
153 if (!ctl->subscribed)
154 continue;
155 spin_lock_irqsave(&ctl->read_lock, flags);
156 list_for_each(elist, &ctl->events) {
157 ev = snd_kctl_event(elist);
158 if (ev->id.numid == id->numid) {
159 ev->mask |= mask;
160 goto _found;
161 }
162 }
163 ev = kzalloc(sizeof(*ev), GFP_ATOMIC);
164 if (ev) {
165 ev->id = *id;
166 ev->mask = mask;
167 list_add_tail(&ev->list, &ctl->events);
168 } else {
169 snd_printk(KERN_ERR "No memory available to allocate event\n");
170 }
171 _found:
172 wake_up(&ctl->change_sleep);
173 spin_unlock_irqrestore(&ctl->read_lock, flags);
174 kill_fasync(&ctl->fasync, SIGIO, POLL_IN);
175 }
176 read_unlock(&card->ctl_files_rwlock);
177 }
178
179 /**
180 * snd_ctl_new - create a control instance from the template
181 * @control: the control template
182 * @access: the default control access
183 *
184 * Allocates a new struct snd_kcontrol instance and copies the given template
185 * to the new instance. It does not copy volatile data (access).
186 *
187 * Returns the pointer of the new instance, or NULL on failure.
188 */
189 struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control, unsigned int access)
190 {
191 struct snd_kcontrol *kctl;
192 unsigned int idx;
193
194 snd_assert(control != NULL, return NULL);
195 snd_assert(control->count > 0, return NULL);
196 kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL);
197 if (kctl == NULL) {
198 snd_printk(KERN_ERR "Cannot allocate control instance\n");
199 return NULL;
200 }
201 *kctl = *control;
202 for (idx = 0; idx < kctl->count; idx++)
203 kctl->vd[idx].access = access;
204 return kctl;
205 }
206
207 /**
208 * snd_ctl_new1 - create a control instance from the template
209 * @ncontrol: the initialization record
210 * @private_data: the private data to set
211 *
212 * Allocates a new struct snd_kcontrol instance and initialize from the given
213 * template. When the access field of ncontrol is 0, it's assumed as
214 * READWRITE access. When the count field is 0, it's assumes as one.
215 *
216 * Returns the pointer of the newly generated instance, or NULL on failure.
217 */
218 struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol,
219 void *private_data)
220 {
221 struct snd_kcontrol kctl;
222 unsigned int access;
223
224 snd_assert(ncontrol != NULL, return NULL);
225 snd_assert(ncontrol->info != NULL, return NULL);
226 memset(&kctl, 0, sizeof(kctl));
227 kctl.id.iface = ncontrol->iface;
228 kctl.id.device = ncontrol->device;
229 kctl.id.subdevice = ncontrol->subdevice;
230 if (ncontrol->name)
231 strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name));
232 kctl.id.index = ncontrol->index;
233 kctl.count = ncontrol->count ? ncontrol->count : 1;
234 access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
235 (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|SNDRV_CTL_ELEM_ACCESS_INACTIVE|
236 SNDRV_CTL_ELEM_ACCESS_DINDIRECT|SNDRV_CTL_ELEM_ACCESS_INDIRECT));
237 kctl.info = ncontrol->info;
238 kctl.get = ncontrol->get;
239 kctl.put = ncontrol->put;
240 kctl.private_value = ncontrol->private_value;
241 kctl.private_data = private_data;
242 return snd_ctl_new(&kctl, access);
243 }
244
245 /**
246 * snd_ctl_free_one - release the control instance
247 * @kcontrol: the control instance
248 *
249 * Releases the control instance created via snd_ctl_new()
250 * or snd_ctl_new1().
251 * Don't call this after the control was added to the card.
252 */
253 void snd_ctl_free_one(struct snd_kcontrol *kcontrol)
254 {
255 if (kcontrol) {
256 if (kcontrol->private_free)
257 kcontrol->private_free(kcontrol);
258 kfree(kcontrol);
259 }
260 }
261
262 static unsigned int snd_ctl_hole_check(struct snd_card *card,
263 unsigned int count)
264 {
265 struct list_head *list;
266 struct snd_kcontrol *kctl;
267
268 list_for_each(list, &card->controls) {
269 kctl = snd_kcontrol(list);
270 if ((kctl->id.numid <= card->last_numid &&
271 kctl->id.numid + kctl->count > card->last_numid) ||
272 (kctl->id.numid <= card->last_numid + count - 1 &&
273 kctl->id.numid + kctl->count > card->last_numid + count - 1))
274 return card->last_numid = kctl->id.numid + kctl->count - 1;
275 }
276 return card->last_numid;
277 }
278
279 static int snd_ctl_find_hole(struct snd_card *card, unsigned int count)
280 {
281 unsigned int last_numid, iter = 100000;
282
283 last_numid = card->last_numid;
284 while (last_numid != snd_ctl_hole_check(card, count)) {
285 if (--iter == 0) {
286 /* this situation is very unlikely */
287 snd_printk(KERN_ERR "unable to allocate new control numid\n");
288 return -ENOMEM;
289 }
290 last_numid = card->last_numid;
291 }
292 return 0;
293 }
294
295 /**
296 * snd_ctl_add - add the control instance to the card
297 * @card: the card instance
298 * @kcontrol: the control instance to add
299 *
300 * Adds the control instance created via snd_ctl_new() or
301 * snd_ctl_new1() to the given card. Assigns also an unique
302 * numid used for fast search.
303 *
304 * Returns zero if successful, or a negative error code on failure.
305 *
306 * It frees automatically the control which cannot be added.
307 */
308 int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
309 {
310 struct snd_ctl_elem_id id;
311 unsigned int idx;
312
313 snd_assert(card != NULL, return -EINVAL);
314 if (! kcontrol)
315 return -EINVAL;
316 snd_assert(kcontrol->info != NULL, return -EINVAL);
317 id = kcontrol->id;
318 down_write(&card->controls_rwsem);
319 if (snd_ctl_find_id(card, &id)) {
320 up_write(&card->controls_rwsem);
321 snd_ctl_free_one(kcontrol);
322 snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n",
323 id.iface,
324 id.device,
325 id.subdevice,
326 id.name,
327 id.index);
328 return -EBUSY;
329 }
330 if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
331 up_write(&card->controls_rwsem);
332 snd_ctl_free_one(kcontrol);
333 return -ENOMEM;
334 }
335 list_add_tail(&kcontrol->list, &card->controls);
336 card->controls_count += kcontrol->count;
337 kcontrol->id.numid = card->last_numid + 1;
338 card->last_numid += kcontrol->count;
339 up_write(&card->controls_rwsem);
340 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
341 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
342 return 0;
343 }
344
345 /**
346 * snd_ctl_remove - remove the control from the card and release it
347 * @card: the card instance
348 * @kcontrol: the control instance to remove
349 *
350 * Removes the control from the card and then releases the instance.
351 * You don't need to call snd_ctl_free_one(). You must be in
352 * the write lock - down_write(&card->controls_rwsem).
353 *
354 * Returns 0 if successful, or a negative error code on failure.
355 */
356 int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol)
357 {
358 struct snd_ctl_elem_id id;
359 unsigned int idx;
360
361 snd_assert(card != NULL && kcontrol != NULL, return -EINVAL);
362 list_del(&kcontrol->list);
363 card->controls_count -= kcontrol->count;
364 id = kcontrol->id;
365 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
366 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id);
367 snd_ctl_free_one(kcontrol);
368 return 0;
369 }
370
371 /**
372 * snd_ctl_remove_id - remove the control of the given id and release it
373 * @card: the card instance
374 * @id: the control id to remove
375 *
376 * Finds the control instance with the given id, removes it from the
377 * card list and releases it.
378 *
379 * Returns 0 if successful, or a negative error code on failure.
380 */
381 int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id)
382 {
383 struct snd_kcontrol *kctl;
384 int ret;
385
386 down_write(&card->controls_rwsem);
387 kctl = snd_ctl_find_id(card, id);
388 if (kctl == NULL) {
389 up_write(&card->controls_rwsem);
390 return -ENOENT;
391 }
392 ret = snd_ctl_remove(card, kctl);
393 up_write(&card->controls_rwsem);
394 return ret;
395 }
396
397 /**
398 * snd_ctl_remove_unlocked_id - remove the unlocked control of the given id and release it
399 * @file: active control handle
400 * @id: the control id to remove
401 *
402 * Finds the control instance with the given id, removes it from the
403 * card list and releases it.
404 *
405 * Returns 0 if successful, or a negative error code on failure.
406 */
407 static int snd_ctl_remove_unlocked_id(struct snd_ctl_file * file,
408 struct snd_ctl_elem_id *id)
409 {
410 struct snd_card *card = file->card;
411 struct snd_kcontrol *kctl;
412 int idx, ret;
413
414 down_write(&card->controls_rwsem);
415 kctl = snd_ctl_find_id(card, id);
416 if (kctl == NULL) {
417 up_write(&card->controls_rwsem);
418 return -ENOENT;
419 }
420 for (idx = 0; idx < kctl->count; idx++)
421 if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {
422 up_write(&card->controls_rwsem);
423 return -EBUSY;
424 }
425 ret = snd_ctl_remove(card, kctl);
426 up_write(&card->controls_rwsem);
427 return ret;
428 }
429
430 /**
431 * snd_ctl_rename_id - replace the id of a control on the card
432 * @card: the card instance
433 * @src_id: the old id
434 * @dst_id: the new id
435 *
436 * Finds the control with the old id from the card, and replaces the
437 * id with the new one.
438 *
439 * Returns zero if successful, or a negative error code on failure.
440 */
441 int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id,
442 struct snd_ctl_elem_id *dst_id)
443 {
444 struct snd_kcontrol *kctl;
445
446 down_write(&card->controls_rwsem);
447 kctl = snd_ctl_find_id(card, src_id);
448 if (kctl == NULL) {
449 up_write(&card->controls_rwsem);
450 return -ENOENT;
451 }
452 kctl->id = *dst_id;
453 kctl->id.numid = card->last_numid + 1;
454 card->last_numid += kctl->count;
455 up_write(&card->controls_rwsem);
456 return 0;
457 }
458
459 /**
460 * snd_ctl_find_numid - find the control instance with the given number-id
461 * @card: the card instance
462 * @numid: the number-id to search
463 *
464 * Finds the control instance with the given number-id from the card.
465 *
466 * Returns the pointer of the instance if found, or NULL if not.
467 *
468 * The caller must down card->controls_rwsem before calling this function
469 * (if the race condition can happen).
470 */
471 struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid)
472 {
473 struct list_head *list;
474 struct snd_kcontrol *kctl;
475
476 snd_assert(card != NULL && numid != 0, return NULL);
477 list_for_each(list, &card->controls) {
478 kctl = snd_kcontrol(list);
479 if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid)
480 return kctl;
481 }
482 return NULL;
483 }
484
485 /**
486 * snd_ctl_find_id - find the control instance with the given id
487 * @card: the card instance
488 * @id: the id to search
489 *
490 * Finds the control instance with the given id from the card.
491 *
492 * Returns the pointer of the instance if found, or NULL if not.
493 *
494 * The caller must down card->controls_rwsem before calling this function
495 * (if the race condition can happen).
496 */
497 struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card,
498 struct snd_ctl_elem_id *id)
499 {
500 struct list_head *list;
501 struct snd_kcontrol *kctl;
502
503 snd_assert(card != NULL && id != NULL, return NULL);
504 if (id->numid != 0)
505 return snd_ctl_find_numid(card, id->numid);
506 list_for_each(list, &card->controls) {
507 kctl = snd_kcontrol(list);
508 if (kctl->id.iface != id->iface)
509 continue;
510 if (kctl->id.device != id->device)
511 continue;
512 if (kctl->id.subdevice != id->subdevice)
513 continue;
514 if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name)))
515 continue;
516 if (kctl->id.index > id->index)
517 continue;
518 if (kctl->id.index + kctl->count <= id->index)
519 continue;
520 return kctl;
521 }
522 return NULL;
523 }
524
525 static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,
526 unsigned int cmd, void __user *arg)
527 {
528 struct snd_ctl_card_info *info;
529
530 info = kzalloc(sizeof(*info), GFP_KERNEL);
531 if (! info)
532 return -ENOMEM;
533 down_read(&snd_ioctl_rwsem);
534 info->card = card->number;
535 strlcpy(info->id, card->id, sizeof(info->id));
536 strlcpy(info->driver, card->driver, sizeof(info->driver));
537 strlcpy(info->name, card->shortname, sizeof(info->name));
538 strlcpy(info->longname, card->longname, sizeof(info->longname));
539 strlcpy(info->mixername, card->mixername, sizeof(info->mixername));
540 strlcpy(info->components, card->components, sizeof(info->components));
541 up_read(&snd_ioctl_rwsem);
542 if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) {
543 kfree(info);
544 return -EFAULT;
545 }
546 kfree(info);
547 return 0;
548 }
549
550 static int snd_ctl_elem_list(struct snd_card *card,
551 struct snd_ctl_elem_list __user *_list)
552 {
553 struct list_head *plist;
554 struct snd_ctl_elem_list list;
555 struct snd_kcontrol *kctl;
556 struct snd_ctl_elem_id *dst, *id;
557 unsigned int offset, space, first, jidx;
558
559 if (copy_from_user(&list, _list, sizeof(list)))
560 return -EFAULT;
561 offset = list.offset;
562 space = list.space;
563 first = 0;
564 /* try limit maximum space */
565 if (space > 16384)
566 return -ENOMEM;
567 if (space > 0) {
568 /* allocate temporary buffer for atomic operation */
569 dst = vmalloc(space * sizeof(struct snd_ctl_elem_id));
570 if (dst == NULL)
571 return -ENOMEM;
572 down_read(&card->controls_rwsem);
573 list.count = card->controls_count;
574 plist = card->controls.next;
575 while (plist != &card->controls) {
576 if (offset == 0)
577 break;
578 kctl = snd_kcontrol(plist);
579 if (offset < kctl->count)
580 break;
581 offset -= kctl->count;
582 plist = plist->next;
583 }
584 list.used = 0;
585 id = dst;
586 while (space > 0 && plist != &card->controls) {
587 kctl = snd_kcontrol(plist);
588 for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) {
589 snd_ctl_build_ioff(id, kctl, jidx);
590 id++;
591 space--;
592 list.used++;
593 }
594 plist = plist->next;
595 offset = 0;
596 }
597 up_read(&card->controls_rwsem);
598 if (list.used > 0 &&
599 copy_to_user(list.pids, dst,
600 list.used * sizeof(struct snd_ctl_elem_id))) {
601 vfree(dst);
602 return -EFAULT;
603 }
604 vfree(dst);
605 } else {
606 down_read(&card->controls_rwsem);
607 list.count = card->controls_count;
608 up_read(&card->controls_rwsem);
609 }
610 if (copy_to_user(_list, &list, sizeof(list)))
611 return -EFAULT;
612 return 0;
613 }
614
615 static int snd_ctl_elem_info(struct snd_ctl_file *ctl,
616 struct snd_ctl_elem_info *info)
617 {
618 struct snd_card *card = ctl->card;
619 struct snd_kcontrol *kctl;
620 struct snd_kcontrol_volatile *vd;
621 unsigned int index_offset;
622 int result;
623
624 down_read(&card->controls_rwsem);
625 kctl = snd_ctl_find_id(card, &info->id);
626 if (kctl == NULL) {
627 up_read(&card->controls_rwsem);
628 return -ENOENT;
629 }
630 #ifdef CONFIG_SND_DEBUG
631 info->access = 0;
632 #endif
633 result = kctl->info(kctl, info);
634 if (result >= 0) {
635 snd_assert(info->access == 0, );
636 index_offset = snd_ctl_get_ioff(kctl, &info->id);
637 vd = &kctl->vd[index_offset];
638 snd_ctl_build_ioff(&info->id, kctl, index_offset);
639 info->access = vd->access;
640 if (vd->owner) {
641 info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK;
642 if (vd->owner == ctl)
643 info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER;
644 info->owner = vd->owner_pid;
645 } else {
646 info->owner = -1;
647 }
648 }
649 up_read(&card->controls_rwsem);
650 return result;
651 }
652
653 static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,
654 struct snd_ctl_elem_info __user *_info)
655 {
656 struct snd_ctl_elem_info info;
657 int result;
658
659 if (copy_from_user(&info, _info, sizeof(info)))
660 return -EFAULT;
661 result = snd_ctl_elem_info(ctl, &info);
662 if (result >= 0)
663 if (copy_to_user(_info, &info, sizeof(info)))
664 return -EFAULT;
665 return result;
666 }
667
668 int snd_ctl_elem_read(struct snd_card *card, struct snd_ctl_elem_value *control)
669 {
670 struct snd_kcontrol *kctl;
671 struct snd_kcontrol_volatile *vd;
672 unsigned int index_offset;
673 int result, indirect;
674
675 down_read(&card->controls_rwsem);
676 kctl = snd_ctl_find_id(card, &control->id);
677 if (kctl == NULL) {
678 result = -ENOENT;
679 } else {
680 index_offset = snd_ctl_get_ioff(kctl, &control->id);
681 vd = &kctl->vd[index_offset];
682 indirect = vd->access & SNDRV_CTL_ELEM_ACCESS_INDIRECT ? 1 : 0;
683 if (control->indirect != indirect) {
684 result = -EACCES;
685 } else {
686 if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && kctl->get != NULL) {
687 snd_ctl_build_ioff(&control->id, kctl, index_offset);
688 result = kctl->get(kctl, control);
689 } else {
690 result = -EPERM;
691 }
692 }
693 }
694 up_read(&card->controls_rwsem);
695 return result;
696 }
697
698 static int snd_ctl_elem_read_user(struct snd_card *card,
699 struct snd_ctl_elem_value __user *_control)
700 {
701 struct snd_ctl_elem_value *control;
702 int result;
703
704 control = kmalloc(sizeof(*control), GFP_KERNEL);
705 if (control == NULL)
706 return -ENOMEM;
707 if (copy_from_user(control, _control, sizeof(*control))) {
708 kfree(control);
709 return -EFAULT;
710 }
711 result = snd_ctl_elem_read(card, control);
712 if (result >= 0)
713 if (copy_to_user(_control, control, sizeof(*control)))
714 result = -EFAULT;
715 kfree(control);
716 return result;
717 }
718
719 int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file,
720 struct snd_ctl_elem_value *control)
721 {
722 struct snd_kcontrol *kctl;
723 struct snd_kcontrol_volatile *vd;
724 unsigned int index_offset;
725 int result, indirect;
726
727 down_read(&card->controls_rwsem);
728 kctl = snd_ctl_find_id(card, &control->id);
729 if (kctl == NULL) {
730 result = -ENOENT;
731 } else {
732 index_offset = snd_ctl_get_ioff(kctl, &control->id);
733 vd = &kctl->vd[index_offset];
734 indirect = vd->access & SNDRV_CTL_ELEM_ACCESS_INDIRECT ? 1 : 0;
735 if (control->indirect != indirect) {
736 result = -EACCES;
737 } else {
738 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) ||
739 kctl->put == NULL ||
740 (file && vd->owner != NULL && vd->owner != file)) {
741 result = -EPERM;
742 } else {
743 snd_ctl_build_ioff(&control->id, kctl, index_offset);
744 result = kctl->put(kctl, control);
745 }
746 if (result > 0) {
747 up_read(&card->controls_rwsem);
748 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &control->id);
749 return 0;
750 }
751 }
752 }
753 up_read(&card->controls_rwsem);
754 return result;
755 }
756
757 static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
758 struct snd_ctl_elem_value __user *_control)
759 {
760 struct snd_ctl_elem_value *control;
761 int result;
762
763 control = kmalloc(sizeof(*control), GFP_KERNEL);
764 if (control == NULL)
765 return -ENOMEM;
766 if (copy_from_user(control, _control, sizeof(*control))) {
767 kfree(control);
768 return -EFAULT;
769 }
770 result = snd_ctl_elem_write(file->card, file, control);
771 if (result >= 0)
772 if (copy_to_user(_control, control, sizeof(*control)))
773 result = -EFAULT;
774 kfree(control);
775 return result;
776 }
777
778 static int snd_ctl_elem_lock(struct snd_ctl_file *file,
779 struct snd_ctl_elem_id __user *_id)
780 {
781 struct snd_card *card = file->card;
782 struct snd_ctl_elem_id id;
783 struct snd_kcontrol *kctl;
784 struct snd_kcontrol_volatile *vd;
785 int result;
786
787 if (copy_from_user(&id, _id, sizeof(id)))
788 return -EFAULT;
789 down_write(&card->controls_rwsem);
790 kctl = snd_ctl_find_id(card, &id);
791 if (kctl == NULL) {
792 result = -ENOENT;
793 } else {
794 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
795 if (vd->owner != NULL)
796 result = -EBUSY;
797 else {
798 vd->owner = file;
799 vd->owner_pid = current->pid;
800 result = 0;
801 }
802 }
803 up_write(&card->controls_rwsem);
804 return result;
805 }
806
807 static int snd_ctl_elem_unlock(struct snd_ctl_file *file,
808 struct snd_ctl_elem_id __user *_id)
809 {
810 struct snd_card *card = file->card;
811 struct snd_ctl_elem_id id;
812 struct snd_kcontrol *kctl;
813 struct snd_kcontrol_volatile *vd;
814 int result;
815
816 if (copy_from_user(&id, _id, sizeof(id)))
817 return -EFAULT;
818 down_write(&card->controls_rwsem);
819 kctl = snd_ctl_find_id(card, &id);
820 if (kctl == NULL) {
821 result = -ENOENT;
822 } else {
823 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
824 if (vd->owner == NULL)
825 result = -EINVAL;
826 else if (vd->owner != file)
827 result = -EPERM;
828 else {
829 vd->owner = NULL;
830 vd->owner_pid = 0;
831 result = 0;
832 }
833 }
834 up_write(&card->controls_rwsem);
835 return result;
836 }
837
838 struct user_element {
839 struct snd_ctl_elem_info info;
840 void *elem_data; /* element data */
841 unsigned long elem_data_size; /* size of element data in bytes */
842 void *priv_data; /* private data (like strings for enumerated type) */
843 unsigned long priv_data_size; /* size of private data in bytes */
844 };
845
846 static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol,
847 struct snd_ctl_elem_info *uinfo)
848 {
849 struct user_element *ue = kcontrol->private_data;
850
851 *uinfo = ue->info;
852 return 0;
853 }
854
855 static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol,
856 struct snd_ctl_elem_value *ucontrol)
857 {
858 struct user_element *ue = kcontrol->private_data;
859
860 memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size);
861 return 0;
862 }
863
864 static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol,
865 struct snd_ctl_elem_value *ucontrol)
866 {
867 int change;
868 struct user_element *ue = kcontrol->private_data;
869
870 change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0;
871 if (change)
872 memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size);
873 return change;
874 }
875
876 static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol)
877 {
878 kfree(kcontrol->private_data);
879 }
880
881 static int snd_ctl_elem_add(struct snd_ctl_file *file,
882 struct snd_ctl_elem_info *info, int replace)
883 {
884 struct snd_card *card = file->card;
885 struct snd_kcontrol kctl, *_kctl;
886 unsigned int access;
887 long private_size;
888 struct user_element *ue;
889 int idx, err;
890
891 if (card->user_ctl_count >= MAX_USER_CONTROLS)
892 return -ENOMEM;
893 if (info->count > 1024)
894 return -EINVAL;
895 access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
896 (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
897 SNDRV_CTL_ELEM_ACCESS_INACTIVE));
898 info->id.numid = 0;
899 memset(&kctl, 0, sizeof(kctl));
900 down_write(&card->controls_rwsem);
901 _kctl = snd_ctl_find_id(card, &info->id);
902 err = 0;
903 if (_kctl) {
904 if (replace)
905 err = snd_ctl_remove(card, _kctl);
906 else
907 err = -EBUSY;
908 } else {
909 if (replace)
910 err = -ENOENT;
911 }
912 up_write(&card->controls_rwsem);
913 if (err < 0)
914 return err;
915 memcpy(&kctl.id, &info->id, sizeof(info->id));
916 kctl.count = info->owner ? info->owner : 1;
917 access |= SNDRV_CTL_ELEM_ACCESS_USER;
918 kctl.info = snd_ctl_elem_user_info;
919 if (access & SNDRV_CTL_ELEM_ACCESS_READ)
920 kctl.get = snd_ctl_elem_user_get;
921 if (access & SNDRV_CTL_ELEM_ACCESS_WRITE)
922 kctl.put = snd_ctl_elem_user_put;
923 switch (info->type) {
924 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
925 private_size = sizeof(char);
926 if (info->count > 128)
927 return -EINVAL;
928 break;
929 case SNDRV_CTL_ELEM_TYPE_INTEGER:
930 private_size = sizeof(long);
931 if (info->count > 128)
932 return -EINVAL;
933 break;
934 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
935 private_size = sizeof(long long);
936 if (info->count > 64)
937 return -EINVAL;
938 break;
939 case SNDRV_CTL_ELEM_TYPE_BYTES:
940 private_size = sizeof(unsigned char);
941 if (info->count > 512)
942 return -EINVAL;
943 break;
944 case SNDRV_CTL_ELEM_TYPE_IEC958:
945 private_size = sizeof(struct snd_aes_iec958);
946 if (info->count != 1)
947 return -EINVAL;
948 break;
949 default:
950 return -EINVAL;
951 }
952 private_size *= info->count;
953 ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL);
954 if (ue == NULL)
955 return -ENOMEM;
956 ue->info = *info;
957 ue->elem_data = (char *)ue + sizeof(*ue);
958 ue->elem_data_size = private_size;
959 kctl.private_free = snd_ctl_elem_user_free;
960 _kctl = snd_ctl_new(&kctl, access);
961 if (_kctl == NULL) {
962 kfree(ue);
963 return -ENOMEM;
964 }
965 _kctl->private_data = ue;
966 for (idx = 0; idx < _kctl->count; idx++)
967 _kctl->vd[idx].owner = file;
968 err = snd_ctl_add(card, _kctl);
969 if (err < 0)
970 return err;
971
972 down_write(&card->controls_rwsem);
973 card->user_ctl_count++;
974 up_write(&card->controls_rwsem);
975
976 return 0;
977 }
978
979 static int snd_ctl_elem_add_user(struct snd_ctl_file *file,
980 struct snd_ctl_elem_info __user *_info, int replace)
981 {
982 struct snd_ctl_elem_info info;
983 if (copy_from_user(&info, _info, sizeof(info)))
984 return -EFAULT;
985 return snd_ctl_elem_add(file, &info, replace);
986 }
987
988 static int snd_ctl_elem_remove(struct snd_ctl_file *file,
989 struct snd_ctl_elem_id __user *_id)
990 {
991 struct snd_ctl_elem_id id;
992 int err;
993
994 if (copy_from_user(&id, _id, sizeof(id)))
995 return -EFAULT;
996 err = snd_ctl_remove_unlocked_id(file, &id);
997 if (! err) {
998 struct snd_card *card = file->card;
999 down_write(&card->controls_rwsem);
1000 card->user_ctl_count--;
1001 up_write(&card->controls_rwsem);
1002 }
1003 return err;
1004 }
1005
1006 static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr)
1007 {
1008 int subscribe;
1009 if (get_user(subscribe, ptr))
1010 return -EFAULT;
1011 if (subscribe < 0) {
1012 subscribe = file->subscribed;
1013 if (put_user(subscribe, ptr))
1014 return -EFAULT;
1015 return 0;
1016 }
1017 if (subscribe) {
1018 file->subscribed = 1;
1019 return 0;
1020 } else if (file->subscribed) {
1021 snd_ctl_empty_read_queue(file);
1022 file->subscribed = 0;
1023 }
1024 return 0;
1025 }
1026
1027 static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1028 {
1029 struct snd_ctl_file *ctl;
1030 struct snd_card *card;
1031 struct list_head *list;
1032 struct snd_kctl_ioctl *p;
1033 void __user *argp = (void __user *)arg;
1034 int __user *ip = argp;
1035 int err;
1036
1037 ctl = file->private_data;
1038 card = ctl->card;
1039 snd_assert(card != NULL, return -ENXIO);
1040 switch (cmd) {
1041 case SNDRV_CTL_IOCTL_PVERSION:
1042 return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0;
1043 case SNDRV_CTL_IOCTL_CARD_INFO:
1044 return snd_ctl_card_info(card, ctl, cmd, argp);
1045 case SNDRV_CTL_IOCTL_ELEM_LIST:
1046 return snd_ctl_elem_list(ctl->card, argp);
1047 case SNDRV_CTL_IOCTL_ELEM_INFO:
1048 return snd_ctl_elem_info_user(ctl, argp);
1049 case SNDRV_CTL_IOCTL_ELEM_READ:
1050 return snd_ctl_elem_read_user(ctl->card, argp);
1051 case SNDRV_CTL_IOCTL_ELEM_WRITE:
1052 return snd_ctl_elem_write_user(ctl, argp);
1053 case SNDRV_CTL_IOCTL_ELEM_LOCK:
1054 return snd_ctl_elem_lock(ctl, argp);
1055 case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
1056 return snd_ctl_elem_unlock(ctl, argp);
1057 case SNDRV_CTL_IOCTL_ELEM_ADD:
1058 return snd_ctl_elem_add_user(ctl, argp, 0);
1059 case SNDRV_CTL_IOCTL_ELEM_REPLACE:
1060 return snd_ctl_elem_add_user(ctl, argp, 1);
1061 case SNDRV_CTL_IOCTL_ELEM_REMOVE:
1062 return snd_ctl_elem_remove(ctl, argp);
1063 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
1064 return snd_ctl_subscribe_events(ctl, ip);
1065 case SNDRV_CTL_IOCTL_POWER:
1066 return -ENOPROTOOPT;
1067 case SNDRV_CTL_IOCTL_POWER_STATE:
1068 #ifdef CONFIG_PM
1069 return put_user(card->power_state, ip) ? -EFAULT : 0;
1070 #else
1071 return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0;
1072 #endif
1073 }
1074 down_read(&snd_ioctl_rwsem);
1075 list_for_each(list, &snd_control_ioctls) {
1076 p = list_entry(list, struct snd_kctl_ioctl, list);
1077 err = p->fioctl(card, ctl, cmd, arg);
1078 if (err != -ENOIOCTLCMD) {
1079 up_read(&snd_ioctl_rwsem);
1080 return err;
1081 }
1082 }
1083 up_read(&snd_ioctl_rwsem);
1084 snd_printdd("unknown ioctl = 0x%x\n", cmd);
1085 return -ENOTTY;
1086 }
1087
1088 static ssize_t snd_ctl_read(struct file *file, char __user *buffer,
1089 size_t count, loff_t * offset)
1090 {
1091 struct snd_ctl_file *ctl;
1092 int err = 0;
1093 ssize_t result = 0;
1094
1095 ctl = file->private_data;
1096 snd_assert(ctl != NULL && ctl->card != NULL, return -ENXIO);
1097 if (!ctl->subscribed)
1098 return -EBADFD;
1099 if (count < sizeof(struct snd_ctl_event))
1100 return -EINVAL;
1101 spin_lock_irq(&ctl->read_lock);
1102 while (count >= sizeof(struct snd_ctl_event)) {
1103 struct snd_ctl_event ev;
1104 struct snd_kctl_event *kev;
1105 while (list_empty(&ctl->events)) {
1106 wait_queue_t wait;
1107 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1108 err = -EAGAIN;
1109 goto __end_lock;
1110 }
1111 init_waitqueue_entry(&wait, current);
1112 add_wait_queue(&ctl->change_sleep, &wait);
1113 set_current_state(TASK_INTERRUPTIBLE);
1114 spin_unlock_irq(&ctl->read_lock);
1115 schedule();
1116 remove_wait_queue(&ctl->change_sleep, &wait);
1117 if (signal_pending(current))
1118 return result > 0 ? result : -ERESTARTSYS;
1119 spin_lock_irq(&ctl->read_lock);
1120 }
1121 kev = snd_kctl_event(ctl->events.next);
1122 ev.type = SNDRV_CTL_EVENT_ELEM;
1123 ev.data.elem.mask = kev->mask;
1124 ev.data.elem.id = kev->id;
1125 list_del(&kev->list);
1126 spin_unlock_irq(&ctl->read_lock);
1127 kfree(kev);
1128 if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) {
1129 err = -EFAULT;
1130 goto __end;
1131 }
1132 spin_lock_irq(&ctl->read_lock);
1133 buffer += sizeof(struct snd_ctl_event);
1134 count -= sizeof(struct snd_ctl_event);
1135 result += sizeof(struct snd_ctl_event);
1136 }
1137 __end_lock:
1138 spin_unlock_irq(&ctl->read_lock);
1139 __end:
1140 return result > 0 ? result : err;
1141 }
1142
1143 static unsigned int snd_ctl_poll(struct file *file, poll_table * wait)
1144 {
1145 unsigned int mask;
1146 struct snd_ctl_file *ctl;
1147
1148 ctl = file->private_data;
1149 if (!ctl->subscribed)
1150 return 0;
1151 poll_wait(file, &ctl->change_sleep, wait);
1152
1153 mask = 0;
1154 if (!list_empty(&ctl->events))
1155 mask |= POLLIN | POLLRDNORM;
1156
1157 return mask;
1158 }
1159
1160 /*
1161 * register the device-specific control-ioctls.
1162 * called from each device manager like pcm.c, hwdep.c, etc.
1163 */
1164 static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists)
1165 {
1166 struct snd_kctl_ioctl *pn;
1167
1168 pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL);
1169 if (pn == NULL)
1170 return -ENOMEM;
1171 pn->fioctl = fcn;
1172 down_write(&snd_ioctl_rwsem);
1173 list_add_tail(&pn->list, lists);
1174 up_write(&snd_ioctl_rwsem);
1175 return 0;
1176 }
1177
1178 int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn)
1179 {
1180 return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls);
1181 }
1182
1183 #ifdef CONFIG_COMPAT
1184 int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1185 {
1186 return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls);
1187 }
1188 #endif
1189
1190 /*
1191 * de-register the device-specific control-ioctls.
1192 */
1193 static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn,
1194 struct list_head *lists)
1195 {
1196 struct list_head *list;
1197 struct snd_kctl_ioctl *p;
1198
1199 snd_assert(fcn != NULL, return -EINVAL);
1200 down_write(&snd_ioctl_rwsem);
1201 list_for_each(list, lists) {
1202 p = list_entry(list, struct snd_kctl_ioctl, list);
1203 if (p->fioctl == fcn) {
1204 list_del(&p->list);
1205 up_write(&snd_ioctl_rwsem);
1206 kfree(p);
1207 return 0;
1208 }
1209 }
1210 up_write(&snd_ioctl_rwsem);
1211 snd_BUG();
1212 return -EINVAL;
1213 }
1214
1215 int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn)
1216 {
1217 return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls);
1218 }
1219
1220 #ifdef CONFIG_COMPAT
1221 int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1222 {
1223 return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls);
1224 }
1225
1226 #endif
1227
1228 static int snd_ctl_fasync(int fd, struct file * file, int on)
1229 {
1230 struct snd_ctl_file *ctl;
1231 int err;
1232 ctl = file->private_data;
1233 err = fasync_helper(fd, file, on, &ctl->fasync);
1234 if (err < 0)
1235 return err;
1236 return 0;
1237 }
1238
1239 /*
1240 * ioctl32 compat
1241 */
1242 #ifdef CONFIG_COMPAT
1243 #include "control_compat.c"
1244 #else
1245 #define snd_ctl_ioctl_compat NULL
1246 #endif
1247
1248 /*
1249 * INIT PART
1250 */
1251
1252 static struct file_operations snd_ctl_f_ops =
1253 {
1254 .owner = THIS_MODULE,
1255 .read = snd_ctl_read,
1256 .open = snd_ctl_open,
1257 .release = snd_ctl_release,
1258 .poll = snd_ctl_poll,
1259 .unlocked_ioctl = snd_ctl_ioctl,
1260 .compat_ioctl = snd_ctl_ioctl_compat,
1261 .fasync = snd_ctl_fasync,
1262 };
1263
1264 /*
1265 * registration of the control device
1266 */
1267 static int snd_ctl_dev_register(struct snd_device *device)
1268 {
1269 struct snd_card *card = device->device_data;
1270 int err, cardnum;
1271 char name[16];
1272
1273 snd_assert(card != NULL, return -ENXIO);
1274 cardnum = card->number;
1275 snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO);
1276 sprintf(name, "controlC%i", cardnum);
1277 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
1278 &snd_ctl_f_ops, card, name)) < 0)
1279 return err;
1280 return 0;
1281 }
1282
1283 /*
1284 * disconnection of the control device
1285 */
1286 static int snd_ctl_dev_disconnect(struct snd_device *device)
1287 {
1288 struct snd_card *card = device->device_data;
1289 struct list_head *flist;
1290 struct snd_ctl_file *ctl;
1291
1292 down_read(&card->controls_rwsem);
1293 list_for_each(flist, &card->ctl_files) {
1294 ctl = snd_ctl_file(flist);
1295 wake_up(&ctl->change_sleep);
1296 kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);
1297 }
1298 up_read(&card->controls_rwsem);
1299 return 0;
1300 }
1301
1302 /*
1303 * free all controls
1304 */
1305 static int snd_ctl_dev_free(struct snd_device *device)
1306 {
1307 struct snd_card *card = device->device_data;
1308 struct snd_kcontrol *control;
1309
1310 down_write(&card->controls_rwsem);
1311 while (!list_empty(&card->controls)) {
1312 control = snd_kcontrol(card->controls.next);
1313 snd_ctl_remove(card, control);
1314 }
1315 up_write(&card->controls_rwsem);
1316 return 0;
1317 }
1318
1319 /*
1320 * de-registration of the control device
1321 */
1322 static int snd_ctl_dev_unregister(struct snd_device *device)
1323 {
1324 struct snd_card *card = device->device_data;
1325 int err, cardnum;
1326
1327 snd_assert(card != NULL, return -ENXIO);
1328 cardnum = card->number;
1329 snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO);
1330 if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL,
1331 card, -1)) < 0)
1332 return err;
1333 return snd_ctl_dev_free(device);
1334 }
1335
1336 /*
1337 * create control core:
1338 * called from init.c
1339 */
1340 int snd_ctl_create(struct snd_card *card)
1341 {
1342 static struct snd_device_ops ops = {
1343 .dev_free = snd_ctl_dev_free,
1344 .dev_register = snd_ctl_dev_register,
1345 .dev_disconnect = snd_ctl_dev_disconnect,
1346 .dev_unregister = snd_ctl_dev_unregister
1347 };
1348
1349 snd_assert(card != NULL, return -ENXIO);
1350 return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);
1351 }
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