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Linux 2.6.26-rc5
[linux-2.6/openmoko-kernel/knife-kernel.git] / sound / core / control.c
blob01a1a5af47bb7749e90370c7ff92dbae528b6199
1 /*
2 * Routines for driver control interface
3 * Copyright (c) by Jaroslav Kysela <perex@perex.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 <linux/threads.h>
23 #include <linux/interrupt.h>
24 #include <linux/slab.h>
25 #include <linux/vmalloc.h>
26 #include <linux/time.h>
27 #include <sound/core.h>
28 #include <sound/minors.h>
29 #include <sound/info.h>
30 #include <sound/control.h>
31
32 /* max number of user-defined controls */
33 #define MAX_USER_CONTROLS 32
34
35 struct snd_kctl_ioctl {
36 struct list_head list; /* list of all ioctls */
37 snd_kctl_ioctl_func_t fioctl;
38 };
39
40 static DECLARE_RWSEM(snd_ioctl_rwsem);
41 static LIST_HEAD(snd_control_ioctls);
42 #ifdef CONFIG_COMPAT
43 static LIST_HEAD(snd_control_compat_ioctls);
44 #endif
45
46 static int snd_ctl_open(struct inode *inode, struct file *file)
47 {
48 unsigned long flags;
49 struct snd_card *card;
50 struct snd_ctl_file *ctl;
51 int err;
52
53 card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL);
54 if (!card) {
55 err = -ENODEV;
56 goto __error1;
57 }
58 err = snd_card_file_add(card, file);
59 if (err < 0) {
60 err = -ENODEV;
61 goto __error1;
62 }
63 if (!try_module_get(card->module)) {
64 err = -EFAULT;
65 goto __error2;
66 }
67 ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
68 if (ctl == NULL) {
69 err = -ENOMEM;
70 goto __error;
71 }
72 INIT_LIST_HEAD(&ctl->events);
73 init_waitqueue_head(&ctl->change_sleep);
74 spin_lock_init(&ctl->read_lock);
75 ctl->card = card;
76 ctl->prefer_pcm_subdevice = -1;
77 ctl->prefer_rawmidi_subdevice = -1;
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 unsigned long flags;
96 struct snd_kctl_event *cread;
97
98 spin_lock_irqsave(&ctl->read_lock, flags);
99 while (!list_empty(&ctl->events)) {
100 cread = snd_kctl_event(ctl->events.next);
101 list_del(&cread->list);
102 kfree(cread);
103 }
104 spin_unlock_irqrestore(&ctl->read_lock, flags);
105 }
106
107 static int snd_ctl_release(struct inode *inode, struct file *file)
108 {
109 unsigned long flags;
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_entry(control, &card->controls, list)
124 for (idx = 0; idx < control->count; idx++)
125 if (control->vd[idx].owner == ctl)
126 control->vd[idx].owner = NULL;
127 up_write(&card->controls_rwsem);
128 snd_ctl_empty_read_queue(ctl);
129 kfree(ctl);
130 module_put(card->module);
131 snd_card_file_remove(card, file);
132 return 0;
133 }
134
135 void snd_ctl_notify(struct snd_card *card, unsigned int mask,
136 struct snd_ctl_elem_id *id)
137 {
138 unsigned long flags;
139 struct snd_ctl_file *ctl;
140 struct snd_kctl_event *ev;
141
142 snd_assert(card != NULL && id != NULL, return);
143 read_lock(&card->ctl_files_rwlock);
144 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
145 card->mixer_oss_change_count++;
146 #endif
147 list_for_each_entry(ctl, &card->ctl_files, list) {
148 if (!ctl->subscribed)
149 continue;
150 spin_lock_irqsave(&ctl->read_lock, flags);
151 list_for_each_entry(ev, &ctl->events, list) {
152 if (ev->id.numid == id->numid) {
153 ev->mask |= mask;
154 goto _found;
155 }
156 }
157 ev = kzalloc(sizeof(*ev), GFP_ATOMIC);
158 if (ev) {
159 ev->id = *id;
160 ev->mask = mask;
161 list_add_tail(&ev->list, &ctl->events);
162 } else {
163 snd_printk(KERN_ERR "No memory available to allocate event\n");
164 }
165 _found:
166 wake_up(&ctl->change_sleep);
167 spin_unlock_irqrestore(&ctl->read_lock, flags);
168 kill_fasync(&ctl->fasync, SIGIO, POLL_IN);
169 }
170 read_unlock(&card->ctl_files_rwlock);
171 }
172
173 EXPORT_SYMBOL(snd_ctl_notify);
174
175 /**
176 * snd_ctl_new - create a control instance from the template
177 * @control: the control template
178 * @access: the default control access
179 *
180 * Allocates a new struct snd_kcontrol instance and copies the given template
181 * to the new instance. It does not copy volatile data (access).
182 *
183 * Returns the pointer of the new instance, or NULL on failure.
184 */
185 static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control,
186 unsigned int access)
187 {
188 struct snd_kcontrol *kctl;
189 unsigned int idx;
190
191 snd_assert(control != NULL, return NULL);
192 snd_assert(control->count > 0, return NULL);
193 kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL);
194 if (kctl == NULL) {
195 snd_printk(KERN_ERR "Cannot allocate control instance\n");
196 return NULL;
197 }
198 *kctl = *control;
199 for (idx = 0; idx < kctl->count; idx++)
200 kctl->vd[idx].access = access;
201 return kctl;
202 }
203
204 /**
205 * snd_ctl_new1 - create a control instance from the template
206 * @ncontrol: the initialization record
207 * @private_data: the private data to set
208 *
209 * Allocates a new struct snd_kcontrol instance and initialize from the given
210 * template. When the access field of ncontrol is 0, it's assumed as
211 * READWRITE access. When the count field is 0, it's assumes as one.
212 *
213 * Returns the pointer of the newly generated instance, or NULL on failure.
214 */
215 struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol,
216 void *private_data)
217 {
218 struct snd_kcontrol kctl;
219 unsigned int access;
220
221 snd_assert(ncontrol != NULL, return NULL);
222 snd_assert(ncontrol->info != NULL, return NULL);
223 memset(&kctl, 0, sizeof(kctl));
224 kctl.id.iface = ncontrol->iface;
225 kctl.id.device = ncontrol->device;
226 kctl.id.subdevice = ncontrol->subdevice;
227 if (ncontrol->name)
228 strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name));
229 kctl.id.index = ncontrol->index;
230 kctl.count = ncontrol->count ? ncontrol->count : 1;
231 access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
232 (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
233 SNDRV_CTL_ELEM_ACCESS_INACTIVE|
234 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE|
235 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK));
236 kctl.info = ncontrol->info;
237 kctl.get = ncontrol->get;
238 kctl.put = ncontrol->put;
239 kctl.tlv.p = ncontrol->tlv.p;
240 kctl.private_value = ncontrol->private_value;
241 kctl.private_data = private_data;
242 return snd_ctl_new(&kctl, access);
243 }
244
245 EXPORT_SYMBOL(snd_ctl_new1);
246
247 /**
248 * snd_ctl_free_one - release the control instance
249 * @kcontrol: the control instance
250 *
251 * Releases the control instance created via snd_ctl_new()
252 * or snd_ctl_new1().
253 * Don't call this after the control was added to the card.
254 */
255 void snd_ctl_free_one(struct snd_kcontrol *kcontrol)
256 {
257 if (kcontrol) {
258 if (kcontrol->private_free)
259 kcontrol->private_free(kcontrol);
260 kfree(kcontrol);
261 }
262 }
263
264 EXPORT_SYMBOL(snd_ctl_free_one);
265
266 static unsigned int snd_ctl_hole_check(struct snd_card *card,
267 unsigned int count)
268 {
269 struct snd_kcontrol *kctl;
270
271 list_for_each_entry(kctl, &card->controls, list) {
272 if ((kctl->id.numid <= card->last_numid &&
273 kctl->id.numid + kctl->count > card->last_numid) ||
274 (kctl->id.numid <= card->last_numid + count - 1 &&
275 kctl->id.numid + kctl->count > card->last_numid + count - 1))
276 return card->last_numid = kctl->id.numid + kctl->count - 1;
277 }
278 return card->last_numid;
279 }
280
281 static int snd_ctl_find_hole(struct snd_card *card, unsigned int count)
282 {
283 unsigned int last_numid, iter = 100000;
284
285 last_numid = card->last_numid;
286 while (last_numid != snd_ctl_hole_check(card, count)) {
287 if (--iter == 0) {
288 /* this situation is very unlikely */
289 snd_printk(KERN_ERR "unable to allocate new control numid\n");
290 return -ENOMEM;
291 }
292 last_numid = card->last_numid;
293 }
294 return 0;
295 }
296
297 /**
298 * snd_ctl_add - add the control instance to the card
299 * @card: the card instance
300 * @kcontrol: the control instance to add
301 *
302 * Adds the control instance created via snd_ctl_new() or
303 * snd_ctl_new1() to the given card. Assigns also an unique
304 * numid used for fast search.
305 *
306 * Returns zero if successful, or a negative error code on failure.
307 *
308 * It frees automatically the control which cannot be added.
309 */
310 int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
311 {
312 struct snd_ctl_elem_id id;
313 unsigned int idx;
314 int err = -EINVAL;
315
316 if (! kcontrol)
317 return err;
318 snd_assert(card != NULL, goto error);
319 snd_assert(kcontrol->info != NULL, goto error);
320 id = kcontrol->id;
321 down_write(&card->controls_rwsem);
322 if (snd_ctl_find_id(card, &id)) {
323 up_write(&card->controls_rwsem);
324 snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n",
325 id.iface,
326 id.device,
327 id.subdevice,
328 id.name,
329 id.index);
330 err = -EBUSY;
331 goto error;
332 }
333 if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
334 up_write(&card->controls_rwsem);
335 err = -ENOMEM;
336 goto error;
337 }
338 list_add_tail(&kcontrol->list, &card->controls);
339 card->controls_count += kcontrol->count;
340 kcontrol->id.numid = card->last_numid + 1;
341 card->last_numid += kcontrol->count;
342 up_write(&card->controls_rwsem);
343 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
344 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
345 return 0;
346
347 error:
348 snd_ctl_free_one(kcontrol);
349 return err;
350 }
351
352 EXPORT_SYMBOL(snd_ctl_add);
353
354 /**
355 * snd_ctl_remove - remove the control from the card and release it
356 * @card: the card instance
357 * @kcontrol: the control instance to remove
358 *
359 * Removes the control from the card and then releases the instance.
360 * You don't need to call snd_ctl_free_one(). You must be in
361 * the write lock - down_write(&card->controls_rwsem).
362 *
363 * Returns 0 if successful, or a negative error code on failure.
364 */
365 int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol)
366 {
367 struct snd_ctl_elem_id id;
368 unsigned int idx;
369
370 snd_assert(card != NULL && kcontrol != NULL, return -EINVAL);
371 list_del(&kcontrol->list);
372 card->controls_count -= kcontrol->count;
373 id = kcontrol->id;
374 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
375 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id);
376 snd_ctl_free_one(kcontrol);
377 return 0;
378 }
379
380 EXPORT_SYMBOL(snd_ctl_remove);
381
382 /**
383 * snd_ctl_remove_id - remove the control of the given id and release it
384 * @card: the card instance
385 * @id: the control id to remove
386 *
387 * Finds the control instance with the given id, removes it from the
388 * card list and releases it.
389 *
390 * Returns 0 if successful, or a negative error code on failure.
391 */
392 int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id)
393 {
394 struct snd_kcontrol *kctl;
395 int ret;
396
397 down_write(&card->controls_rwsem);
398 kctl = snd_ctl_find_id(card, id);
399 if (kctl == NULL) {
400 up_write(&card->controls_rwsem);
401 return -ENOENT;
402 }
403 ret = snd_ctl_remove(card, kctl);
404 up_write(&card->controls_rwsem);
405 return ret;
406 }
407
408 EXPORT_SYMBOL(snd_ctl_remove_id);
409
410 /**
411 * snd_ctl_remove_unlocked_id - remove the unlocked control of the given id and release it
412 * @file: active control handle
413 * @id: the control id to remove
414 *
415 * Finds the control instance with the given id, removes it from the
416 * card list and releases it.
417 *
418 * Returns 0 if successful, or a negative error code on failure.
419 */
420 static int snd_ctl_remove_unlocked_id(struct snd_ctl_file * file,
421 struct snd_ctl_elem_id *id)
422 {
423 struct snd_card *card = file->card;
424 struct snd_kcontrol *kctl;
425 int idx, ret;
426
427 down_write(&card->controls_rwsem);
428 kctl = snd_ctl_find_id(card, id);
429 if (kctl == NULL) {
430 up_write(&card->controls_rwsem);
431 return -ENOENT;
432 }
433 for (idx = 0; idx < kctl->count; idx++)
434 if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {
435 up_write(&card->controls_rwsem);
436 return -EBUSY;
437 }
438 ret = snd_ctl_remove(card, kctl);
439 up_write(&card->controls_rwsem);
440 return ret;
441 }
442
443 /**
444 * snd_ctl_rename_id - replace the id of a control on the card
445 * @card: the card instance
446 * @src_id: the old id
447 * @dst_id: the new id
448 *
449 * Finds the control with the old id from the card, and replaces the
450 * id with the new one.
451 *
452 * Returns zero if successful, or a negative error code on failure.
453 */
454 int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id,
455 struct snd_ctl_elem_id *dst_id)
456 {
457 struct snd_kcontrol *kctl;
458
459 down_write(&card->controls_rwsem);
460 kctl = snd_ctl_find_id(card, src_id);
461 if (kctl == NULL) {
462 up_write(&card->controls_rwsem);
463 return -ENOENT;
464 }
465 kctl->id = *dst_id;
466 kctl->id.numid = card->last_numid + 1;
467 card->last_numid += kctl->count;
468 up_write(&card->controls_rwsem);
469 return 0;
470 }
471
472 EXPORT_SYMBOL(snd_ctl_rename_id);
473
474 /**
475 * snd_ctl_find_numid - find the control instance with the given number-id
476 * @card: the card instance
477 * @numid: the number-id to search
478 *
479 * Finds the control instance with the given number-id from the card.
480 *
481 * Returns the pointer of the instance if found, or NULL if not.
482 *
483 * The caller must down card->controls_rwsem before calling this function
484 * (if the race condition can happen).
485 */
486 struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid)
487 {
488 struct snd_kcontrol *kctl;
489
490 snd_assert(card != NULL && numid != 0, return NULL);
491 list_for_each_entry(kctl, &card->controls, list) {
492 if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid)
493 return kctl;
494 }
495 return NULL;
496 }
497
498 EXPORT_SYMBOL(snd_ctl_find_numid);
499
500 /**
501 * snd_ctl_find_id - find the control instance with the given id
502 * @card: the card instance
503 * @id: the id to search
504 *
505 * Finds the control instance with the given id from the card.
506 *
507 * Returns the pointer of the instance if found, or NULL if not.
508 *
509 * The caller must down card->controls_rwsem before calling this function
510 * (if the race condition can happen).
511 */
512 struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card,
513 struct snd_ctl_elem_id *id)
514 {
515 struct snd_kcontrol *kctl;
516
517 snd_assert(card != NULL && id != NULL, return NULL);
518 if (id->numid != 0)
519 return snd_ctl_find_numid(card, id->numid);
520 list_for_each_entry(kctl, &card->controls, list) {
521 if (kctl->id.iface != id->iface)
522 continue;
523 if (kctl->id.device != id->device)
524 continue;
525 if (kctl->id.subdevice != id->subdevice)
526 continue;
527 if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name)))
528 continue;
529 if (kctl->id.index > id->index)
530 continue;
531 if (kctl->id.index + kctl->count <= id->index)
532 continue;
533 return kctl;
534 }
535 return NULL;
536 }
537
538 EXPORT_SYMBOL(snd_ctl_find_id);
539
540 static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,
541 unsigned int cmd, void __user *arg)
542 {
543 struct snd_ctl_card_info *info;
544
545 info = kzalloc(sizeof(*info), GFP_KERNEL);
546 if (! info)
547 return -ENOMEM;
548 down_read(&snd_ioctl_rwsem);
549 info->card = card->number;
550 strlcpy(info->id, card->id, sizeof(info->id));
551 strlcpy(info->driver, card->driver, sizeof(info->driver));
552 strlcpy(info->name, card->shortname, sizeof(info->name));
553 strlcpy(info->longname, card->longname, sizeof(info->longname));
554 strlcpy(info->mixername, card->mixername, sizeof(info->mixername));
555 strlcpy(info->components, card->components, sizeof(info->components));
556 up_read(&snd_ioctl_rwsem);
557 if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) {
558 kfree(info);
559 return -EFAULT;
560 }
561 kfree(info);
562 return 0;
563 }
564
565 static int snd_ctl_elem_list(struct snd_card *card,
566 struct snd_ctl_elem_list __user *_list)
567 {
568 struct list_head *plist;
569 struct snd_ctl_elem_list list;
570 struct snd_kcontrol *kctl;
571 struct snd_ctl_elem_id *dst, *id;
572 unsigned int offset, space, first, jidx;
573
574 if (copy_from_user(&list, _list, sizeof(list)))
575 return -EFAULT;
576 offset = list.offset;
577 space = list.space;
578 first = 0;
579 /* try limit maximum space */
580 if (space > 16384)
581 return -ENOMEM;
582 if (space > 0) {
583 /* allocate temporary buffer for atomic operation */
584 dst = vmalloc(space * sizeof(struct snd_ctl_elem_id));
585 if (dst == NULL)
586 return -ENOMEM;
587 down_read(&card->controls_rwsem);
588 list.count = card->controls_count;
589 plist = card->controls.next;
590 while (plist != &card->controls) {
591 if (offset == 0)
592 break;
593 kctl = snd_kcontrol(plist);
594 if (offset < kctl->count)
595 break;
596 offset -= kctl->count;
597 plist = plist->next;
598 }
599 list.used = 0;
600 id = dst;
601 while (space > 0 && plist != &card->controls) {
602 kctl = snd_kcontrol(plist);
603 for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) {
604 snd_ctl_build_ioff(id, kctl, jidx);
605 id++;
606 space--;
607 list.used++;
608 }
609 plist = plist->next;
610 offset = 0;
611 }
612 up_read(&card->controls_rwsem);
613 if (list.used > 0 &&
614 copy_to_user(list.pids, dst,
615 list.used * sizeof(struct snd_ctl_elem_id))) {
616 vfree(dst);
617 return -EFAULT;
618 }
619 vfree(dst);
620 } else {
621 down_read(&card->controls_rwsem);
622 list.count = card->controls_count;
623 up_read(&card->controls_rwsem);
624 }
625 if (copy_to_user(_list, &list, sizeof(list)))
626 return -EFAULT;
627 return 0;
628 }
629
630 static int snd_ctl_elem_info(struct snd_ctl_file *ctl,
631 struct snd_ctl_elem_info *info)
632 {
633 struct snd_card *card = ctl->card;
634 struct snd_kcontrol *kctl;
635 struct snd_kcontrol_volatile *vd;
636 unsigned int index_offset;
637 int result;
638
639 down_read(&card->controls_rwsem);
640 kctl = snd_ctl_find_id(card, &info->id);
641 if (kctl == NULL) {
642 up_read(&card->controls_rwsem);
643 return -ENOENT;
644 }
645 #ifdef CONFIG_SND_DEBUG
646 info->access = 0;
647 #endif
648 result = kctl->info(kctl, info);
649 if (result >= 0) {
650 snd_assert(info->access == 0, );
651 index_offset = snd_ctl_get_ioff(kctl, &info->id);
652 vd = &kctl->vd[index_offset];
653 snd_ctl_build_ioff(&info->id, kctl, index_offset);
654 info->access = vd->access;
655 if (vd->owner) {
656 info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK;
657 if (vd->owner == ctl)
658 info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER;
659 info->owner = vd->owner_pid;
660 } else {
661 info->owner = -1;
662 }
663 }
664 up_read(&card->controls_rwsem);
665 return result;
666 }
667
668 static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,
669 struct snd_ctl_elem_info __user *_info)
670 {
671 struct snd_ctl_elem_info info;
672 int result;
673
674 if (copy_from_user(&info, _info, sizeof(info)))
675 return -EFAULT;
676 snd_power_lock(ctl->card);
677 result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
678 if (result >= 0)
679 result = snd_ctl_elem_info(ctl, &info);
680 snd_power_unlock(ctl->card);
681 if (result >= 0)
682 if (copy_to_user(_info, &info, sizeof(info)))
683 return -EFAULT;
684 return result;
685 }
686
687 int snd_ctl_elem_read(struct snd_card *card, struct snd_ctl_elem_value *control)
688 {
689 struct snd_kcontrol *kctl;
690 struct snd_kcontrol_volatile *vd;
691 unsigned int index_offset;
692 int result;
693
694 down_read(&card->controls_rwsem);
695 kctl = snd_ctl_find_id(card, &control->id);
696 if (kctl == NULL) {
697 result = -ENOENT;
698 } else {
699 index_offset = snd_ctl_get_ioff(kctl, &control->id);
700 vd = &kctl->vd[index_offset];
701 if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) &&
702 kctl->get != NULL) {
703 snd_ctl_build_ioff(&control->id, kctl, index_offset);
704 result = kctl->get(kctl, control);
705 } else
706 result = -EPERM;
707 }
708 up_read(&card->controls_rwsem);
709 return result;
710 }
711
712 static int snd_ctl_elem_read_user(struct snd_card *card,
713 struct snd_ctl_elem_value __user *_control)
714 {
715 struct snd_ctl_elem_value *control;
716 int result;
717
718 control = kmalloc(sizeof(*control), GFP_KERNEL);
719 if (control == NULL)
720 return -ENOMEM;
721 if (copy_from_user(control, _control, sizeof(*control))) {
722 kfree(control);
723 return -EFAULT;
724 }
725 snd_power_lock(card);
726 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
727 if (result >= 0)
728 result = snd_ctl_elem_read(card, control);
729 snd_power_unlock(card);
730 if (result >= 0)
731 if (copy_to_user(_control, control, sizeof(*control)))
732 result = -EFAULT;
733 kfree(control);
734 return result;
735 }
736
737 int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file,
738 struct snd_ctl_elem_value *control)
739 {
740 struct snd_kcontrol *kctl;
741 struct snd_kcontrol_volatile *vd;
742 unsigned int index_offset;
743 int result;
744
745 down_read(&card->controls_rwsem);
746 kctl = snd_ctl_find_id(card, &control->id);
747 if (kctl == NULL) {
748 result = -ENOENT;
749 } else {
750 index_offset = snd_ctl_get_ioff(kctl, &control->id);
751 vd = &kctl->vd[index_offset];
752 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) ||
753 kctl->put == NULL ||
754 (file && vd->owner && vd->owner != file)) {
755 result = -EPERM;
756 } else {
757 snd_ctl_build_ioff(&control->id, kctl, index_offset);
758 result = kctl->put(kctl, control);
759 }
760 if (result > 0) {
761 up_read(&card->controls_rwsem);
762 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
763 &control->id);
764 return 0;
765 }
766 }
767 up_read(&card->controls_rwsem);
768 return result;
769 }
770
771 static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
772 struct snd_ctl_elem_value __user *_control)
773 {
774 struct snd_ctl_elem_value *control;
775 struct snd_card *card;
776 int result;
777
778 control = kmalloc(sizeof(*control), GFP_KERNEL);
779 if (control == NULL)
780 return -ENOMEM;
781 if (copy_from_user(control, _control, sizeof(*control))) {
782 kfree(control);
783 return -EFAULT;
784 }
785 card = file->card;
786 snd_power_lock(card);
787 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
788 if (result >= 0)
789 result = snd_ctl_elem_write(card, file, control);
790 snd_power_unlock(card);
791 if (result >= 0)
792 if (copy_to_user(_control, control, sizeof(*control)))
793 result = -EFAULT;
794 kfree(control);
795 return result;
796 }
797
798 static int snd_ctl_elem_lock(struct snd_ctl_file *file,
799 struct snd_ctl_elem_id __user *_id)
800 {
801 struct snd_card *card = file->card;
802 struct snd_ctl_elem_id id;
803 struct snd_kcontrol *kctl;
804 struct snd_kcontrol_volatile *vd;
805 int result;
806
807 if (copy_from_user(&id, _id, sizeof(id)))
808 return -EFAULT;
809 down_write(&card->controls_rwsem);
810 kctl = snd_ctl_find_id(card, &id);
811 if (kctl == NULL) {
812 result = -ENOENT;
813 } else {
814 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
815 if (vd->owner != NULL)
816 result = -EBUSY;
817 else {
818 vd->owner = file;
819 vd->owner_pid = current->pid;
820 result = 0;
821 }
822 }
823 up_write(&card->controls_rwsem);
824 return result;
825 }
826
827 static int snd_ctl_elem_unlock(struct snd_ctl_file *file,
828 struct snd_ctl_elem_id __user *_id)
829 {
830 struct snd_card *card = file->card;
831 struct snd_ctl_elem_id id;
832 struct snd_kcontrol *kctl;
833 struct snd_kcontrol_volatile *vd;
834 int result;
835
836 if (copy_from_user(&id, _id, sizeof(id)))
837 return -EFAULT;
838 down_write(&card->controls_rwsem);
839 kctl = snd_ctl_find_id(card, &id);
840 if (kctl == NULL) {
841 result = -ENOENT;
842 } else {
843 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
844 if (vd->owner == NULL)
845 result = -EINVAL;
846 else if (vd->owner != file)
847 result = -EPERM;
848 else {
849 vd->owner = NULL;
850 vd->owner_pid = 0;
851 result = 0;
852 }
853 }
854 up_write(&card->controls_rwsem);
855 return result;
856 }
857
858 struct user_element {
859 struct snd_ctl_elem_info info;
860 void *elem_data; /* element data */
861 unsigned long elem_data_size; /* size of element data in bytes */
862 void *tlv_data; /* TLV data */
863 unsigned long tlv_data_size; /* TLV data size */
864 void *priv_data; /* private data (like strings for enumerated type) */
865 unsigned long priv_data_size; /* size of private data in bytes */
866 };
867
868 static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol,
869 struct snd_ctl_elem_info *uinfo)
870 {
871 struct user_element *ue = kcontrol->private_data;
872
873 *uinfo = ue->info;
874 return 0;
875 }
876
877 static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol,
878 struct snd_ctl_elem_value *ucontrol)
879 {
880 struct user_element *ue = kcontrol->private_data;
881
882 memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size);
883 return 0;
884 }
885
886 static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol,
887 struct snd_ctl_elem_value *ucontrol)
888 {
889 int change;
890 struct user_element *ue = kcontrol->private_data;
891
892 change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0;
893 if (change)
894 memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size);
895 return change;
896 }
897
898 static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol,
899 int op_flag,
900 unsigned int size,
901 unsigned int __user *tlv)
902 {
903 struct user_element *ue = kcontrol->private_data;
904 int change = 0;
905 void *new_data;
906
907 if (op_flag > 0) {
908 if (size > 1024 * 128) /* sane value */
909 return -EINVAL;
910 new_data = kmalloc(size, GFP_KERNEL);
911 if (new_data == NULL)
912 return -ENOMEM;
913 if (copy_from_user(new_data, tlv, size)) {
914 kfree(new_data);
915 return -EFAULT;
916 }
917 change = ue->tlv_data_size != size;
918 if (!change)
919 change = memcmp(ue->tlv_data, new_data, size);
920 kfree(ue->tlv_data);
921 ue->tlv_data = new_data;
922 ue->tlv_data_size = size;
923 } else {
924 if (! ue->tlv_data_size || ! ue->tlv_data)
925 return -ENXIO;
926 if (size < ue->tlv_data_size)
927 return -ENOSPC;
928 if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size))
929 return -EFAULT;
930 }
931 return change;
932 }
933
934 static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol)
935 {
936 struct user_element *ue = kcontrol->private_data;
937 if (ue->tlv_data)
938 kfree(ue->tlv_data);
939 kfree(ue);
940 }
941
942 static int snd_ctl_elem_add(struct snd_ctl_file *file,
943 struct snd_ctl_elem_info *info, int replace)
944 {
945 struct snd_card *card = file->card;
946 struct snd_kcontrol kctl, *_kctl;
947 unsigned int access;
948 long private_size;
949 struct user_element *ue;
950 int idx, err;
951
952 if (card->user_ctl_count >= MAX_USER_CONTROLS)
953 return -ENOMEM;
954 if (info->count > 1024)
955 return -EINVAL;
956 access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
957 (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
958 SNDRV_CTL_ELEM_ACCESS_INACTIVE|
959 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE));
960 info->id.numid = 0;
961 memset(&kctl, 0, sizeof(kctl));
962 down_write(&card->controls_rwsem);
963 _kctl = snd_ctl_find_id(card, &info->id);
964 err = 0;
965 if (_kctl) {
966 if (replace)
967 err = snd_ctl_remove(card, _kctl);
968 else
969 err = -EBUSY;
970 } else {
971 if (replace)
972 err = -ENOENT;
973 }
974 up_write(&card->controls_rwsem);
975 if (err < 0)
976 return err;
977 memcpy(&kctl.id, &info->id, sizeof(info->id));
978 kctl.count = info->owner ? info->owner : 1;
979 access |= SNDRV_CTL_ELEM_ACCESS_USER;
980 kctl.info = snd_ctl_elem_user_info;
981 if (access & SNDRV_CTL_ELEM_ACCESS_READ)
982 kctl.get = snd_ctl_elem_user_get;
983 if (access & SNDRV_CTL_ELEM_ACCESS_WRITE)
984 kctl.put = snd_ctl_elem_user_put;
985 if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) {
986 kctl.tlv.c = snd_ctl_elem_user_tlv;
987 access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
988 }
989 switch (info->type) {
990 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
991 case SNDRV_CTL_ELEM_TYPE_INTEGER:
992 private_size = sizeof(long);
993 if (info->count > 128)
994 return -EINVAL;
995 break;
996 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
997 private_size = sizeof(long long);
998 if (info->count > 64)
999 return -EINVAL;
1000 break;
1001 case SNDRV_CTL_ELEM_TYPE_BYTES:
1002 private_size = sizeof(unsigned char);
1003 if (info->count > 512)
1004 return -EINVAL;
1005 break;
1006 case SNDRV_CTL_ELEM_TYPE_IEC958:
1007 private_size = sizeof(struct snd_aes_iec958);
1008 if (info->count != 1)
1009 return -EINVAL;
1010 break;
1011 default:
1012 return -EINVAL;
1013 }
1014 private_size *= info->count;
1015 ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL);
1016 if (ue == NULL)
1017 return -ENOMEM;
1018 ue->info = *info;
1019 ue->info.access = 0;
1020 ue->elem_data = (char *)ue + sizeof(*ue);
1021 ue->elem_data_size = private_size;
1022 kctl.private_free = snd_ctl_elem_user_free;
1023 _kctl = snd_ctl_new(&kctl, access);
1024 if (_kctl == NULL) {
1025 kfree(ue);
1026 return -ENOMEM;
1027 }
1028 _kctl->private_data = ue;
1029 for (idx = 0; idx < _kctl->count; idx++)
1030 _kctl->vd[idx].owner = file;
1031 err = snd_ctl_add(card, _kctl);
1032 if (err < 0)
1033 return err;
1034
1035 down_write(&card->controls_rwsem);
1036 card->user_ctl_count++;
1037 up_write(&card->controls_rwsem);
1038
1039 return 0;
1040 }
1041
1042 static int snd_ctl_elem_add_user(struct snd_ctl_file *file,
1043 struct snd_ctl_elem_info __user *_info, int replace)
1044 {
1045 struct snd_ctl_elem_info info;
1046 if (copy_from_user(&info, _info, sizeof(info)))
1047 return -EFAULT;
1048 return snd_ctl_elem_add(file, &info, replace);
1049 }
1050
1051 static int snd_ctl_elem_remove(struct snd_ctl_file *file,
1052 struct snd_ctl_elem_id __user *_id)
1053 {
1054 struct snd_ctl_elem_id id;
1055 int err;
1056
1057 if (copy_from_user(&id, _id, sizeof(id)))
1058 return -EFAULT;
1059 err = snd_ctl_remove_unlocked_id(file, &id);
1060 if (! err) {
1061 struct snd_card *card = file->card;
1062 down_write(&card->controls_rwsem);
1063 card->user_ctl_count--;
1064 up_write(&card->controls_rwsem);
1065 }
1066 return err;
1067 }
1068
1069 static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr)
1070 {
1071 int subscribe;
1072 if (get_user(subscribe, ptr))
1073 return -EFAULT;
1074 if (subscribe < 0) {
1075 subscribe = file->subscribed;
1076 if (put_user(subscribe, ptr))
1077 return -EFAULT;
1078 return 0;
1079 }
1080 if (subscribe) {
1081 file->subscribed = 1;
1082 return 0;
1083 } else if (file->subscribed) {
1084 snd_ctl_empty_read_queue(file);
1085 file->subscribed = 0;
1086 }
1087 return 0;
1088 }
1089
1090 static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file,
1091 struct snd_ctl_tlv __user *_tlv,
1092 int op_flag)
1093 {
1094 struct snd_card *card = file->card;
1095 struct snd_ctl_tlv tlv;
1096 struct snd_kcontrol *kctl;
1097 struct snd_kcontrol_volatile *vd;
1098 unsigned int len;
1099 int err = 0;
1100
1101 if (copy_from_user(&tlv, _tlv, sizeof(tlv)))
1102 return -EFAULT;
1103 if (tlv.length < sizeof(unsigned int) * 3)
1104 return -EINVAL;
1105 down_read(&card->controls_rwsem);
1106 kctl = snd_ctl_find_numid(card, tlv.numid);
1107 if (kctl == NULL) {
1108 err = -ENOENT;
1109 goto __kctl_end;
1110 }
1111 if (kctl->tlv.p == NULL) {
1112 err = -ENXIO;
1113 goto __kctl_end;
1114 }
1115 vd = &kctl->vd[tlv.numid - kctl->id.numid];
1116 if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) ||
1117 (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) ||
1118 (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) {
1119 err = -ENXIO;
1120 goto __kctl_end;
1121 }
1122 if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) {
1123 if (file && vd->owner != NULL && vd->owner != file) {
1124 err = -EPERM;
1125 goto __kctl_end;
1126 }
1127 err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv);
1128 if (err > 0) {
1129 up_read(&card->controls_rwsem);
1130 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id);
1131 return 0;
1132 }
1133 } else {
1134 if (op_flag) {
1135 err = -ENXIO;
1136 goto __kctl_end;
1137 }
1138 len = kctl->tlv.p[1] + 2 * sizeof(unsigned int);
1139 if (tlv.length < len) {
1140 err = -ENOMEM;
1141 goto __kctl_end;
1142 }
1143 if (copy_to_user(_tlv->tlv, kctl->tlv.p, len))
1144 err = -EFAULT;
1145 }
1146 __kctl_end:
1147 up_read(&card->controls_rwsem);
1148 return err;
1149 }
1150
1151 static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1152 {
1153 struct snd_ctl_file *ctl;
1154 struct snd_card *card;
1155 struct snd_kctl_ioctl *p;
1156 void __user *argp = (void __user *)arg;
1157 int __user *ip = argp;
1158 int err;
1159
1160 ctl = file->private_data;
1161 card = ctl->card;
1162 snd_assert(card != NULL, return -ENXIO);
1163 switch (cmd) {
1164 case SNDRV_CTL_IOCTL_PVERSION:
1165 return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0;
1166 case SNDRV_CTL_IOCTL_CARD_INFO:
1167 return snd_ctl_card_info(card, ctl, cmd, argp);
1168 case SNDRV_CTL_IOCTL_ELEM_LIST:
1169 return snd_ctl_elem_list(card, argp);
1170 case SNDRV_CTL_IOCTL_ELEM_INFO:
1171 return snd_ctl_elem_info_user(ctl, argp);
1172 case SNDRV_CTL_IOCTL_ELEM_READ:
1173 return snd_ctl_elem_read_user(card, argp);
1174 case SNDRV_CTL_IOCTL_ELEM_WRITE:
1175 return snd_ctl_elem_write_user(ctl, argp);
1176 case SNDRV_CTL_IOCTL_ELEM_LOCK:
1177 return snd_ctl_elem_lock(ctl, argp);
1178 case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
1179 return snd_ctl_elem_unlock(ctl, argp);
1180 case SNDRV_CTL_IOCTL_ELEM_ADD:
1181 return snd_ctl_elem_add_user(ctl, argp, 0);
1182 case SNDRV_CTL_IOCTL_ELEM_REPLACE:
1183 return snd_ctl_elem_add_user(ctl, argp, 1);
1184 case SNDRV_CTL_IOCTL_ELEM_REMOVE:
1185 return snd_ctl_elem_remove(ctl, argp);
1186 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
1187 return snd_ctl_subscribe_events(ctl, ip);
1188 case SNDRV_CTL_IOCTL_TLV_READ:
1189 return snd_ctl_tlv_ioctl(ctl, argp, 0);
1190 case SNDRV_CTL_IOCTL_TLV_WRITE:
1191 return snd_ctl_tlv_ioctl(ctl, argp, 1);
1192 case SNDRV_CTL_IOCTL_TLV_COMMAND:
1193 return snd_ctl_tlv_ioctl(ctl, argp, -1);
1194 case SNDRV_CTL_IOCTL_POWER:
1195 return -ENOPROTOOPT;
1196 case SNDRV_CTL_IOCTL_POWER_STATE:
1197 #ifdef CONFIG_PM
1198 return put_user(card->power_state, ip) ? -EFAULT : 0;
1199 #else
1200 return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0;
1201 #endif
1202 }
1203 down_read(&snd_ioctl_rwsem);
1204 list_for_each_entry(p, &snd_control_ioctls, list) {
1205 err = p->fioctl(card, ctl, cmd, arg);
1206 if (err != -ENOIOCTLCMD) {
1207 up_read(&snd_ioctl_rwsem);
1208 return err;
1209 }
1210 }
1211 up_read(&snd_ioctl_rwsem);
1212 snd_printdd("unknown ioctl = 0x%x\n", cmd);
1213 return -ENOTTY;
1214 }
1215
1216 static ssize_t snd_ctl_read(struct file *file, char __user *buffer,
1217 size_t count, loff_t * offset)
1218 {
1219 struct snd_ctl_file *ctl;
1220 int err = 0;
1221 ssize_t result = 0;
1222
1223 ctl = file->private_data;
1224 snd_assert(ctl != NULL && ctl->card != NULL, return -ENXIO);
1225 if (!ctl->subscribed)
1226 return -EBADFD;
1227 if (count < sizeof(struct snd_ctl_event))
1228 return -EINVAL;
1229 spin_lock_irq(&ctl->read_lock);
1230 while (count >= sizeof(struct snd_ctl_event)) {
1231 struct snd_ctl_event ev;
1232 struct snd_kctl_event *kev;
1233 while (list_empty(&ctl->events)) {
1234 wait_queue_t wait;
1235 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1236 err = -EAGAIN;
1237 goto __end_lock;
1238 }
1239 init_waitqueue_entry(&wait, current);
1240 add_wait_queue(&ctl->change_sleep, &wait);
1241 set_current_state(TASK_INTERRUPTIBLE);
1242 spin_unlock_irq(&ctl->read_lock);
1243 schedule();
1244 remove_wait_queue(&ctl->change_sleep, &wait);
1245 if (signal_pending(current))
1246 return -ERESTARTSYS;
1247 spin_lock_irq(&ctl->read_lock);
1248 }
1249 kev = snd_kctl_event(ctl->events.next);
1250 ev.type = SNDRV_CTL_EVENT_ELEM;
1251 ev.data.elem.mask = kev->mask;
1252 ev.data.elem.id = kev->id;
1253 list_del(&kev->list);
1254 spin_unlock_irq(&ctl->read_lock);
1255 kfree(kev);
1256 if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) {
1257 err = -EFAULT;
1258 goto __end;
1259 }
1260 spin_lock_irq(&ctl->read_lock);
1261 buffer += sizeof(struct snd_ctl_event);
1262 count -= sizeof(struct snd_ctl_event);
1263 result += sizeof(struct snd_ctl_event);
1264 }
1265 __end_lock:
1266 spin_unlock_irq(&ctl->read_lock);
1267 __end:
1268 return result > 0 ? result : err;
1269 }
1270
1271 static unsigned int snd_ctl_poll(struct file *file, poll_table * wait)
1272 {
1273 unsigned int mask;
1274 struct snd_ctl_file *ctl;
1275
1276 ctl = file->private_data;
1277 if (!ctl->subscribed)
1278 return 0;
1279 poll_wait(file, &ctl->change_sleep, wait);
1280
1281 mask = 0;
1282 if (!list_empty(&ctl->events))
1283 mask |= POLLIN | POLLRDNORM;
1284
1285 return mask;
1286 }
1287
1288 /*
1289 * register the device-specific control-ioctls.
1290 * called from each device manager like pcm.c, hwdep.c, etc.
1291 */
1292 static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists)
1293 {
1294 struct snd_kctl_ioctl *pn;
1295
1296 pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL);
1297 if (pn == NULL)
1298 return -ENOMEM;
1299 pn->fioctl = fcn;
1300 down_write(&snd_ioctl_rwsem);
1301 list_add_tail(&pn->list, lists);
1302 up_write(&snd_ioctl_rwsem);
1303 return 0;
1304 }
1305
1306 int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn)
1307 {
1308 return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls);
1309 }
1310
1311 EXPORT_SYMBOL(snd_ctl_register_ioctl);
1312
1313 #ifdef CONFIG_COMPAT
1314 int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1315 {
1316 return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls);
1317 }
1318
1319 EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
1320 #endif
1321
1322 /*
1323 * de-register the device-specific control-ioctls.
1324 */
1325 static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn,
1326 struct list_head *lists)
1327 {
1328 struct snd_kctl_ioctl *p;
1329
1330 snd_assert(fcn != NULL, return -EINVAL);
1331 down_write(&snd_ioctl_rwsem);
1332 list_for_each_entry(p, lists, list) {
1333 if (p->fioctl == fcn) {
1334 list_del(&p->list);
1335 up_write(&snd_ioctl_rwsem);
1336 kfree(p);
1337 return 0;
1338 }
1339 }
1340 up_write(&snd_ioctl_rwsem);
1341 snd_BUG();
1342 return -EINVAL;
1343 }
1344
1345 int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn)
1346 {
1347 return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls);
1348 }
1349
1350 EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
1351
1352 #ifdef CONFIG_COMPAT
1353 int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1354 {
1355 return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls);
1356 }
1357
1358 EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
1359 #endif
1360
1361 static int snd_ctl_fasync(int fd, struct file * file, int on)
1362 {
1363 struct snd_ctl_file *ctl;
1364 int err;
1365 ctl = file->private_data;
1366 err = fasync_helper(fd, file, on, &ctl->fasync);
1367 if (err < 0)
1368 return err;
1369 return 0;
1370 }
1371
1372 /*
1373 * ioctl32 compat
1374 */
1375 #ifdef CONFIG_COMPAT
1376 #include "control_compat.c"
1377 #else
1378 #define snd_ctl_ioctl_compat NULL
1379 #endif
1380
1381 /*
1382 * INIT PART
1383 */
1384
1385 static const struct file_operations snd_ctl_f_ops =
1386 {
1387 .owner = THIS_MODULE,
1388 .read = snd_ctl_read,
1389 .open = snd_ctl_open,
1390 .release = snd_ctl_release,
1391 .poll = snd_ctl_poll,
1392 .unlocked_ioctl = snd_ctl_ioctl,
1393 .compat_ioctl = snd_ctl_ioctl_compat,
1394 .fasync = snd_ctl_fasync,
1395 };
1396
1397 /*
1398 * registration of the control device
1399 */
1400 static int snd_ctl_dev_register(struct snd_device *device)
1401 {
1402 struct snd_card *card = device->device_data;
1403 int err, cardnum;
1404 char name[16];
1405
1406 snd_assert(card != NULL, return -ENXIO);
1407 cardnum = card->number;
1408 snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO);
1409 sprintf(name, "controlC%i", cardnum);
1410 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
1411 &snd_ctl_f_ops, card, name)) < 0)
1412 return err;
1413 return 0;
1414 }
1415
1416 /*
1417 * disconnection of the control device
1418 */
1419 static int snd_ctl_dev_disconnect(struct snd_device *device)
1420 {
1421 struct snd_card *card = device->device_data;
1422 struct snd_ctl_file *ctl;
1423 int err, cardnum;
1424
1425 snd_assert(card != NULL, return -ENXIO);
1426 cardnum = card->number;
1427 snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO);
1428
1429 down_read(&card->controls_rwsem);
1430 list_for_each_entry(ctl, &card->ctl_files, list) {
1431 wake_up(&ctl->change_sleep);
1432 kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);
1433 }
1434 up_read(&card->controls_rwsem);
1435
1436 if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL,
1437 card, -1)) < 0)
1438 return err;
1439 return 0;
1440 }
1441
1442 /*
1443 * free all controls
1444 */
1445 static int snd_ctl_dev_free(struct snd_device *device)
1446 {
1447 struct snd_card *card = device->device_data;
1448 struct snd_kcontrol *control;
1449
1450 down_write(&card->controls_rwsem);
1451 while (!list_empty(&card->controls)) {
1452 control = snd_kcontrol(card->controls.next);
1453 snd_ctl_remove(card, control);
1454 }
1455 up_write(&card->controls_rwsem);
1456 return 0;
1457 }
1458
1459 /*
1460 * create control core:
1461 * called from init.c
1462 */
1463 int snd_ctl_create(struct snd_card *card)
1464 {
1465 static struct snd_device_ops ops = {
1466 .dev_free = snd_ctl_dev_free,
1467 .dev_register = snd_ctl_dev_register,
1468 .dev_disconnect = snd_ctl_dev_disconnect,
1469 };
1470
1471 snd_assert(card != NULL, return -ENXIO);
1472 return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);
1473 }
1474
1475 /*
1476 * Frequently used control callbacks
1477 */
1478 int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
1479 struct snd_ctl_elem_info *uinfo)
1480 {
1481 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1482 uinfo->count = 1;
1483 uinfo->value.integer.min = 0;
1484 uinfo->value.integer.max = 1;
1485 return 0;
1486 }
1487
1488 EXPORT_SYMBOL(snd_ctl_boolean_mono_info);
1489
1490 int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
1491 struct snd_ctl_elem_info *uinfo)
1492 {
1493 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1494 uinfo->count = 2;
1495 uinfo->value.integer.min = 0;
1496 uinfo->value.integer.max = 1;
1497 return 0;
1498 }
1499
1500 EXPORT_SYMBOL(snd_ctl_boolean_stereo_info);
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