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Linux 3.8-rc7
[cris-mirror.git] / sound / core / control.c
blob8c7c2c9bba61e4dd421eb6a0c797bd0cf17b81ae
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/module.h>
25 #include <linux/slab.h>
26 #include <linux/vmalloc.h>
27 #include <linux/time.h>
28 #include <sound/core.h>
29 #include <sound/minors.h>
30 #include <sound/info.h>
31 #include <sound/control.h>
32
33 /* max number of user-defined controls */
34 #define MAX_USER_CONTROLS 32
35 #define MAX_CONTROL_COUNT 1028
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 err = nonseekable_open(inode, file);
56 if (err < 0)
57 return err;
58
59 card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL);
60 if (!card) {
61 err = -ENODEV;
62 goto __error1;
63 }
64 err = snd_card_file_add(card, file);
65 if (err < 0) {
66 err = -ENODEV;
67 goto __error1;
68 }
69 if (!try_module_get(card->module)) {
70 err = -EFAULT;
71 goto __error2;
72 }
73 ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
74 if (ctl == NULL) {
75 err = -ENOMEM;
76 goto __error;
77 }
78 INIT_LIST_HEAD(&ctl->events);
79 init_waitqueue_head(&ctl->change_sleep);
80 spin_lock_init(&ctl->read_lock);
81 ctl->card = card;
82 ctl->prefer_pcm_subdevice = -1;
83 ctl->prefer_rawmidi_subdevice = -1;
84 ctl->pid = get_pid(task_pid(current));
85 file->private_data = ctl;
86 write_lock_irqsave(&card->ctl_files_rwlock, flags);
87 list_add_tail(&ctl->list, &card->ctl_files);
88 write_unlock_irqrestore(&card->ctl_files_rwlock, flags);
89 snd_card_unref(card);
90 return 0;
91
92 __error:
93 module_put(card->module);
94 __error2:
95 snd_card_file_remove(card, file);
96 __error1:
97 if (card)
98 snd_card_unref(card);
99 return err;
100 }
101
102 static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl)
103 {
104 unsigned long flags;
105 struct snd_kctl_event *cread;
106
107 spin_lock_irqsave(&ctl->read_lock, flags);
108 while (!list_empty(&ctl->events)) {
109 cread = snd_kctl_event(ctl->events.next);
110 list_del(&cread->list);
111 kfree(cread);
112 }
113 spin_unlock_irqrestore(&ctl->read_lock, flags);
114 }
115
116 static int snd_ctl_release(struct inode *inode, struct file *file)
117 {
118 unsigned long flags;
119 struct snd_card *card;
120 struct snd_ctl_file *ctl;
121 struct snd_kcontrol *control;
122 unsigned int idx;
123
124 ctl = file->private_data;
125 file->private_data = NULL;
126 card = ctl->card;
127 write_lock_irqsave(&card->ctl_files_rwlock, flags);
128 list_del(&ctl->list);
129 write_unlock_irqrestore(&card->ctl_files_rwlock, flags);
130 down_write(&card->controls_rwsem);
131 list_for_each_entry(control, &card->controls, list)
132 for (idx = 0; idx < control->count; idx++)
133 if (control->vd[idx].owner == ctl)
134 control->vd[idx].owner = NULL;
135 up_write(&card->controls_rwsem);
136 snd_ctl_empty_read_queue(ctl);
137 put_pid(ctl->pid);
138 kfree(ctl);
139 module_put(card->module);
140 snd_card_file_remove(card, file);
141 return 0;
142 }
143
144 void snd_ctl_notify(struct snd_card *card, unsigned int mask,
145 struct snd_ctl_elem_id *id)
146 {
147 unsigned long flags;
148 struct snd_ctl_file *ctl;
149 struct snd_kctl_event *ev;
150
151 if (snd_BUG_ON(!card || !id))
152 return;
153 read_lock(&card->ctl_files_rwlock);
154 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
155 card->mixer_oss_change_count++;
156 #endif
157 list_for_each_entry(ctl, &card->ctl_files, list) {
158 if (!ctl->subscribed)
159 continue;
160 spin_lock_irqsave(&ctl->read_lock, flags);
161 list_for_each_entry(ev, &ctl->events, list) {
162 if (ev->id.numid == id->numid) {
163 ev->mask |= mask;
164 goto _found;
165 }
166 }
167 ev = kzalloc(sizeof(*ev), GFP_ATOMIC);
168 if (ev) {
169 ev->id = *id;
170 ev->mask = mask;
171 list_add_tail(&ev->list, &ctl->events);
172 } else {
173 snd_printk(KERN_ERR "No memory available to allocate event\n");
174 }
175 _found:
176 wake_up(&ctl->change_sleep);
177 spin_unlock_irqrestore(&ctl->read_lock, flags);
178 kill_fasync(&ctl->fasync, SIGIO, POLL_IN);
179 }
180 read_unlock(&card->ctl_files_rwlock);
181 }
182
183 EXPORT_SYMBOL(snd_ctl_notify);
184
185 /**
186 * snd_ctl_new - create a control instance from the template
187 * @control: the control template
188 * @access: the default control access
189 *
190 * Allocates a new struct snd_kcontrol instance and copies the given template
191 * to the new instance. It does not copy volatile data (access).
192 *
193 * Returns the pointer of the new instance, or NULL on failure.
194 */
195 static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control,
196 unsigned int access)
197 {
198 struct snd_kcontrol *kctl;
199 unsigned int idx;
200
201 if (snd_BUG_ON(!control || !control->count))
202 return NULL;
203
204 if (control->count > MAX_CONTROL_COUNT)
205 return NULL;
206
207 kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL);
208 if (kctl == NULL) {
209 snd_printk(KERN_ERR "Cannot allocate control instance\n");
210 return NULL;
211 }
212 *kctl = *control;
213 for (idx = 0; idx < kctl->count; idx++)
214 kctl->vd[idx].access = access;
215 return kctl;
216 }
217
218 /**
219 * snd_ctl_new1 - create a control instance from the template
220 * @ncontrol: the initialization record
221 * @private_data: the private data to set
222 *
223 * Allocates a new struct snd_kcontrol instance and initialize from the given
224 * template. When the access field of ncontrol is 0, it's assumed as
225 * READWRITE access. When the count field is 0, it's assumes as one.
226 *
227 * Returns the pointer of the newly generated instance, or NULL on failure.
228 */
229 struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol,
230 void *private_data)
231 {
232 struct snd_kcontrol kctl;
233 unsigned int access;
234
235 if (snd_BUG_ON(!ncontrol || !ncontrol->info))
236 return NULL;
237 memset(&kctl, 0, sizeof(kctl));
238 kctl.id.iface = ncontrol->iface;
239 kctl.id.device = ncontrol->device;
240 kctl.id.subdevice = ncontrol->subdevice;
241 if (ncontrol->name) {
242 strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name));
243 if (strcmp(ncontrol->name, kctl.id.name) != 0)
244 snd_printk(KERN_WARNING
245 "Control name '%s' truncated to '%s'\n",
246 ncontrol->name, kctl.id.name);
247 }
248 kctl.id.index = ncontrol->index;
249 kctl.count = ncontrol->count ? ncontrol->count : 1;
250 access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
251 (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
252 SNDRV_CTL_ELEM_ACCESS_VOLATILE|
253 SNDRV_CTL_ELEM_ACCESS_INACTIVE|
254 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE|
255 SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND|
256 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK));
257 kctl.info = ncontrol->info;
258 kctl.get = ncontrol->get;
259 kctl.put = ncontrol->put;
260 kctl.tlv.p = ncontrol->tlv.p;
261 kctl.private_value = ncontrol->private_value;
262 kctl.private_data = private_data;
263 return snd_ctl_new(&kctl, access);
264 }
265
266 EXPORT_SYMBOL(snd_ctl_new1);
267
268 /**
269 * snd_ctl_free_one - release the control instance
270 * @kcontrol: the control instance
271 *
272 * Releases the control instance created via snd_ctl_new()
273 * or snd_ctl_new1().
274 * Don't call this after the control was added to the card.
275 */
276 void snd_ctl_free_one(struct snd_kcontrol *kcontrol)
277 {
278 if (kcontrol) {
279 if (kcontrol->private_free)
280 kcontrol->private_free(kcontrol);
281 kfree(kcontrol);
282 }
283 }
284
285 EXPORT_SYMBOL(snd_ctl_free_one);
286
287 static bool snd_ctl_remove_numid_conflict(struct snd_card *card,
288 unsigned int count)
289 {
290 struct snd_kcontrol *kctl;
291
292 list_for_each_entry(kctl, &card->controls, list) {
293 if (kctl->id.numid < card->last_numid + 1 + count &&
294 kctl->id.numid + kctl->count > card->last_numid + 1) {
295 card->last_numid = kctl->id.numid + kctl->count - 1;
296 return true;
297 }
298 }
299 return false;
300 }
301
302 static int snd_ctl_find_hole(struct snd_card *card, unsigned int count)
303 {
304 unsigned int iter = 100000;
305
306 while (snd_ctl_remove_numid_conflict(card, count)) {
307 if (--iter == 0) {
308 /* this situation is very unlikely */
309 snd_printk(KERN_ERR "unable to allocate new control numid\n");
310 return -ENOMEM;
311 }
312 }
313 return 0;
314 }
315
316 /**
317 * snd_ctl_add - add the control instance to the card
318 * @card: the card instance
319 * @kcontrol: the control instance to add
320 *
321 * Adds the control instance created via snd_ctl_new() or
322 * snd_ctl_new1() to the given card. Assigns also an unique
323 * numid used for fast search.
324 *
325 * Returns zero if successful, or a negative error code on failure.
326 *
327 * It frees automatically the control which cannot be added.
328 */
329 int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
330 {
331 struct snd_ctl_elem_id id;
332 unsigned int idx;
333 int err = -EINVAL;
334
335 if (! kcontrol)
336 return err;
337 if (snd_BUG_ON(!card || !kcontrol->info))
338 goto error;
339 id = kcontrol->id;
340 down_write(&card->controls_rwsem);
341 if (snd_ctl_find_id(card, &id)) {
342 up_write(&card->controls_rwsem);
343 snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n",
344 id.iface,
345 id.device,
346 id.subdevice,
347 id.name,
348 id.index);
349 err = -EBUSY;
350 goto error;
351 }
352 if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
353 up_write(&card->controls_rwsem);
354 err = -ENOMEM;
355 goto error;
356 }
357 list_add_tail(&kcontrol->list, &card->controls);
358 card->controls_count += kcontrol->count;
359 kcontrol->id.numid = card->last_numid + 1;
360 card->last_numid += kcontrol->count;
361 up_write(&card->controls_rwsem);
362 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
363 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
364 return 0;
365
366 error:
367 snd_ctl_free_one(kcontrol);
368 return err;
369 }
370
371 EXPORT_SYMBOL(snd_ctl_add);
372
373 /**
374 * snd_ctl_replace - replace the control instance of the card
375 * @card: the card instance
376 * @kcontrol: the control instance to replace
377 * @add_on_replace: add the control if not already added
378 *
379 * Replaces the given control. If the given control does not exist
380 * and the add_on_replace flag is set, the control is added. If the
381 * control exists, it is destroyed first.
382 *
383 * Returns zero if successful, or a negative error code on failure.
384 *
385 * It frees automatically the control which cannot be added or replaced.
386 */
387 int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol,
388 bool add_on_replace)
389 {
390 struct snd_ctl_elem_id id;
391 unsigned int idx;
392 struct snd_kcontrol *old;
393 int ret;
394
395 if (!kcontrol)
396 return -EINVAL;
397 if (snd_BUG_ON(!card || !kcontrol->info)) {
398 ret = -EINVAL;
399 goto error;
400 }
401 id = kcontrol->id;
402 down_write(&card->controls_rwsem);
403 old = snd_ctl_find_id(card, &id);
404 if (!old) {
405 if (add_on_replace)
406 goto add;
407 up_write(&card->controls_rwsem);
408 ret = -EINVAL;
409 goto error;
410 }
411 ret = snd_ctl_remove(card, old);
412 if (ret < 0) {
413 up_write(&card->controls_rwsem);
414 goto error;
415 }
416 add:
417 if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
418 up_write(&card->controls_rwsem);
419 ret = -ENOMEM;
420 goto error;
421 }
422 list_add_tail(&kcontrol->list, &card->controls);
423 card->controls_count += kcontrol->count;
424 kcontrol->id.numid = card->last_numid + 1;
425 card->last_numid += kcontrol->count;
426 up_write(&card->controls_rwsem);
427 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
428 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
429 return 0;
430
431 error:
432 snd_ctl_free_one(kcontrol);
433 return ret;
434 }
435 EXPORT_SYMBOL(snd_ctl_replace);
436
437 /**
438 * snd_ctl_remove - remove the control from the card and release it
439 * @card: the card instance
440 * @kcontrol: the control instance to remove
441 *
442 * Removes the control from the card and then releases the instance.
443 * You don't need to call snd_ctl_free_one(). You must be in
444 * the write lock - down_write(&card->controls_rwsem).
445 *
446 * Returns 0 if successful, or a negative error code on failure.
447 */
448 int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol)
449 {
450 struct snd_ctl_elem_id id;
451 unsigned int idx;
452
453 if (snd_BUG_ON(!card || !kcontrol))
454 return -EINVAL;
455 list_del(&kcontrol->list);
456 card->controls_count -= kcontrol->count;
457 id = kcontrol->id;
458 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
459 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id);
460 snd_ctl_free_one(kcontrol);
461 return 0;
462 }
463
464 EXPORT_SYMBOL(snd_ctl_remove);
465
466 /**
467 * snd_ctl_remove_id - remove the control of the given id and release it
468 * @card: the card instance
469 * @id: the control id to remove
470 *
471 * Finds the control instance with the given id, removes it from the
472 * card list and releases it.
473 *
474 * Returns 0 if successful, or a negative error code on failure.
475 */
476 int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id)
477 {
478 struct snd_kcontrol *kctl;
479 int ret;
480
481 down_write(&card->controls_rwsem);
482 kctl = snd_ctl_find_id(card, id);
483 if (kctl == NULL) {
484 up_write(&card->controls_rwsem);
485 return -ENOENT;
486 }
487 ret = snd_ctl_remove(card, kctl);
488 up_write(&card->controls_rwsem);
489 return ret;
490 }
491
492 EXPORT_SYMBOL(snd_ctl_remove_id);
493
494 /**
495 * snd_ctl_remove_user_ctl - remove and release the unlocked user control
496 * @file: active control handle
497 * @id: the control id to remove
498 *
499 * Finds the control instance with the given id, removes it from the
500 * card list and releases it.
501 *
502 * Returns 0 if successful, or a negative error code on failure.
503 */
504 static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file,
505 struct snd_ctl_elem_id *id)
506 {
507 struct snd_card *card = file->card;
508 struct snd_kcontrol *kctl;
509 int idx, ret;
510
511 down_write(&card->controls_rwsem);
512 kctl = snd_ctl_find_id(card, id);
513 if (kctl == NULL) {
514 ret = -ENOENT;
515 goto error;
516 }
517 if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) {
518 ret = -EINVAL;
519 goto error;
520 }
521 for (idx = 0; idx < kctl->count; idx++)
522 if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {
523 ret = -EBUSY;
524 goto error;
525 }
526 ret = snd_ctl_remove(card, kctl);
527 if (ret < 0)
528 goto error;
529 card->user_ctl_count--;
530 error:
531 up_write(&card->controls_rwsem);
532 return ret;
533 }
534
535 /**
536 * snd_ctl_activate_id - activate/inactivate the control of the given id
537 * @card: the card instance
538 * @id: the control id to activate/inactivate
539 * @active: non-zero to activate
540 *
541 * Finds the control instance with the given id, and activate or
542 * inactivate the control together with notification, if changed.
543 *
544 * Returns 0 if unchanged, 1 if changed, or a negative error code on failure.
545 */
546 int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id,
547 int active)
548 {
549 struct snd_kcontrol *kctl;
550 struct snd_kcontrol_volatile *vd;
551 unsigned int index_offset;
552 int ret;
553
554 down_write(&card->controls_rwsem);
555 kctl = snd_ctl_find_id(card, id);
556 if (kctl == NULL) {
557 ret = -ENOENT;
558 goto unlock;
559 }
560 index_offset = snd_ctl_get_ioff(kctl, &kctl->id);
561 vd = &kctl->vd[index_offset];
562 ret = 0;
563 if (active) {
564 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE))
565 goto unlock;
566 vd->access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
567 } else {
568 if (vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)
569 goto unlock;
570 vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
571 }
572 ret = 1;
573 unlock:
574 up_write(&card->controls_rwsem);
575 if (ret > 0)
576 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, id);
577 return ret;
578 }
579 EXPORT_SYMBOL_GPL(snd_ctl_activate_id);
580
581 /**
582 * snd_ctl_rename_id - replace the id of a control on the card
583 * @card: the card instance
584 * @src_id: the old id
585 * @dst_id: the new id
586 *
587 * Finds the control with the old id from the card, and replaces the
588 * id with the new one.
589 *
590 * Returns zero if successful, or a negative error code on failure.
591 */
592 int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id,
593 struct snd_ctl_elem_id *dst_id)
594 {
595 struct snd_kcontrol *kctl;
596
597 down_write(&card->controls_rwsem);
598 kctl = snd_ctl_find_id(card, src_id);
599 if (kctl == NULL) {
600 up_write(&card->controls_rwsem);
601 return -ENOENT;
602 }
603 kctl->id = *dst_id;
604 kctl->id.numid = card->last_numid + 1;
605 card->last_numid += kctl->count;
606 up_write(&card->controls_rwsem);
607 return 0;
608 }
609
610 EXPORT_SYMBOL(snd_ctl_rename_id);
611
612 /**
613 * snd_ctl_find_numid - find the control instance with the given number-id
614 * @card: the card instance
615 * @numid: the number-id to search
616 *
617 * Finds the control instance with the given number-id from the card.
618 *
619 * Returns the pointer of the instance if found, or NULL if not.
620 *
621 * The caller must down card->controls_rwsem before calling this function
622 * (if the race condition can happen).
623 */
624 struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid)
625 {
626 struct snd_kcontrol *kctl;
627
628 if (snd_BUG_ON(!card || !numid))
629 return NULL;
630 list_for_each_entry(kctl, &card->controls, list) {
631 if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid)
632 return kctl;
633 }
634 return NULL;
635 }
636
637 EXPORT_SYMBOL(snd_ctl_find_numid);
638
639 /**
640 * snd_ctl_find_id - find the control instance with the given id
641 * @card: the card instance
642 * @id: the id to search
643 *
644 * Finds the control instance with the given id from the card.
645 *
646 * Returns the pointer of the instance if found, or NULL if not.
647 *
648 * The caller must down card->controls_rwsem before calling this function
649 * (if the race condition can happen).
650 */
651 struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card,
652 struct snd_ctl_elem_id *id)
653 {
654 struct snd_kcontrol *kctl;
655
656 if (snd_BUG_ON(!card || !id))
657 return NULL;
658 if (id->numid != 0)
659 return snd_ctl_find_numid(card, id->numid);
660 list_for_each_entry(kctl, &card->controls, list) {
661 if (kctl->id.iface != id->iface)
662 continue;
663 if (kctl->id.device != id->device)
664 continue;
665 if (kctl->id.subdevice != id->subdevice)
666 continue;
667 if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name)))
668 continue;
669 if (kctl->id.index > id->index)
670 continue;
671 if (kctl->id.index + kctl->count <= id->index)
672 continue;
673 return kctl;
674 }
675 return NULL;
676 }
677
678 EXPORT_SYMBOL(snd_ctl_find_id);
679
680 static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,
681 unsigned int cmd, void __user *arg)
682 {
683 struct snd_ctl_card_info *info;
684
685 info = kzalloc(sizeof(*info), GFP_KERNEL);
686 if (! info)
687 return -ENOMEM;
688 down_read(&snd_ioctl_rwsem);
689 info->card = card->number;
690 strlcpy(info->id, card->id, sizeof(info->id));
691 strlcpy(info->driver, card->driver, sizeof(info->driver));
692 strlcpy(info->name, card->shortname, sizeof(info->name));
693 strlcpy(info->longname, card->longname, sizeof(info->longname));
694 strlcpy(info->mixername, card->mixername, sizeof(info->mixername));
695 strlcpy(info->components, card->components, sizeof(info->components));
696 up_read(&snd_ioctl_rwsem);
697 if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) {
698 kfree(info);
699 return -EFAULT;
700 }
701 kfree(info);
702 return 0;
703 }
704
705 static int snd_ctl_elem_list(struct snd_card *card,
706 struct snd_ctl_elem_list __user *_list)
707 {
708 struct list_head *plist;
709 struct snd_ctl_elem_list list;
710 struct snd_kcontrol *kctl;
711 struct snd_ctl_elem_id *dst, *id;
712 unsigned int offset, space, jidx;
713
714 if (copy_from_user(&list, _list, sizeof(list)))
715 return -EFAULT;
716 offset = list.offset;
717 space = list.space;
718 /* try limit maximum space */
719 if (space > 16384)
720 return -ENOMEM;
721 if (space > 0) {
722 /* allocate temporary buffer for atomic operation */
723 dst = vmalloc(space * sizeof(struct snd_ctl_elem_id));
724 if (dst == NULL)
725 return -ENOMEM;
726 down_read(&card->controls_rwsem);
727 list.count = card->controls_count;
728 plist = card->controls.next;
729 while (plist != &card->controls) {
730 if (offset == 0)
731 break;
732 kctl = snd_kcontrol(plist);
733 if (offset < kctl->count)
734 break;
735 offset -= kctl->count;
736 plist = plist->next;
737 }
738 list.used = 0;
739 id = dst;
740 while (space > 0 && plist != &card->controls) {
741 kctl = snd_kcontrol(plist);
742 for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) {
743 snd_ctl_build_ioff(id, kctl, jidx);
744 id++;
745 space--;
746 list.used++;
747 }
748 plist = plist->next;
749 offset = 0;
750 }
751 up_read(&card->controls_rwsem);
752 if (list.used > 0 &&
753 copy_to_user(list.pids, dst,
754 list.used * sizeof(struct snd_ctl_elem_id))) {
755 vfree(dst);
756 return -EFAULT;
757 }
758 vfree(dst);
759 } else {
760 down_read(&card->controls_rwsem);
761 list.count = card->controls_count;
762 up_read(&card->controls_rwsem);
763 }
764 if (copy_to_user(_list, &list, sizeof(list)))
765 return -EFAULT;
766 return 0;
767 }
768
769 static int snd_ctl_elem_info(struct snd_ctl_file *ctl,
770 struct snd_ctl_elem_info *info)
771 {
772 struct snd_card *card = ctl->card;
773 struct snd_kcontrol *kctl;
774 struct snd_kcontrol_volatile *vd;
775 unsigned int index_offset;
776 int result;
777
778 down_read(&card->controls_rwsem);
779 kctl = snd_ctl_find_id(card, &info->id);
780 if (kctl == NULL) {
781 up_read(&card->controls_rwsem);
782 return -ENOENT;
783 }
784 #ifdef CONFIG_SND_DEBUG
785 info->access = 0;
786 #endif
787 result = kctl->info(kctl, info);
788 if (result >= 0) {
789 snd_BUG_ON(info->access);
790 index_offset = snd_ctl_get_ioff(kctl, &info->id);
791 vd = &kctl->vd[index_offset];
792 snd_ctl_build_ioff(&info->id, kctl, index_offset);
793 info->access = vd->access;
794 if (vd->owner) {
795 info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK;
796 if (vd->owner == ctl)
797 info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER;
798 info->owner = pid_vnr(vd->owner->pid);
799 } else {
800 info->owner = -1;
801 }
802 }
803 up_read(&card->controls_rwsem);
804 return result;
805 }
806
807 static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,
808 struct snd_ctl_elem_info __user *_info)
809 {
810 struct snd_ctl_elem_info info;
811 int result;
812
813 if (copy_from_user(&info, _info, sizeof(info)))
814 return -EFAULT;
815 snd_power_lock(ctl->card);
816 result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
817 if (result >= 0)
818 result = snd_ctl_elem_info(ctl, &info);
819 snd_power_unlock(ctl->card);
820 if (result >= 0)
821 if (copy_to_user(_info, &info, sizeof(info)))
822 return -EFAULT;
823 return result;
824 }
825
826 static int snd_ctl_elem_read(struct snd_card *card,
827 struct snd_ctl_elem_value *control)
828 {
829 struct snd_kcontrol *kctl;
830 struct snd_kcontrol_volatile *vd;
831 unsigned int index_offset;
832 int result;
833
834 down_read(&card->controls_rwsem);
835 kctl = snd_ctl_find_id(card, &control->id);
836 if (kctl == NULL) {
837 result = -ENOENT;
838 } else {
839 index_offset = snd_ctl_get_ioff(kctl, &control->id);
840 vd = &kctl->vd[index_offset];
841 if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) &&
842 kctl->get != NULL) {
843 snd_ctl_build_ioff(&control->id, kctl, index_offset);
844 result = kctl->get(kctl, control);
845 } else
846 result = -EPERM;
847 }
848 up_read(&card->controls_rwsem);
849 return result;
850 }
851
852 static int snd_ctl_elem_read_user(struct snd_card *card,
853 struct snd_ctl_elem_value __user *_control)
854 {
855 struct snd_ctl_elem_value *control;
856 int result;
857
858 control = memdup_user(_control, sizeof(*control));
859 if (IS_ERR(control))
860 return PTR_ERR(control);
861
862 snd_power_lock(card);
863 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
864 if (result >= 0)
865 result = snd_ctl_elem_read(card, control);
866 snd_power_unlock(card);
867 if (result >= 0)
868 if (copy_to_user(_control, control, sizeof(*control)))
869 result = -EFAULT;
870 kfree(control);
871 return result;
872 }
873
874 static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file,
875 struct snd_ctl_elem_value *control)
876 {
877 struct snd_kcontrol *kctl;
878 struct snd_kcontrol_volatile *vd;
879 unsigned int index_offset;
880 int result;
881
882 down_read(&card->controls_rwsem);
883 kctl = snd_ctl_find_id(card, &control->id);
884 if (kctl == NULL) {
885 result = -ENOENT;
886 } else {
887 index_offset = snd_ctl_get_ioff(kctl, &control->id);
888 vd = &kctl->vd[index_offset];
889 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) ||
890 kctl->put == NULL ||
891 (file && vd->owner && vd->owner != file)) {
892 result = -EPERM;
893 } else {
894 snd_ctl_build_ioff(&control->id, kctl, index_offset);
895 result = kctl->put(kctl, control);
896 }
897 if (result > 0) {
898 up_read(&card->controls_rwsem);
899 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
900 &control->id);
901 return 0;
902 }
903 }
904 up_read(&card->controls_rwsem);
905 return result;
906 }
907
908 static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
909 struct snd_ctl_elem_value __user *_control)
910 {
911 struct snd_ctl_elem_value *control;
912 struct snd_card *card;
913 int result;
914
915 control = memdup_user(_control, sizeof(*control));
916 if (IS_ERR(control))
917 return PTR_ERR(control);
918
919 card = file->card;
920 snd_power_lock(card);
921 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
922 if (result >= 0)
923 result = snd_ctl_elem_write(card, file, control);
924 snd_power_unlock(card);
925 if (result >= 0)
926 if (copy_to_user(_control, control, sizeof(*control)))
927 result = -EFAULT;
928 kfree(control);
929 return result;
930 }
931
932 static int snd_ctl_elem_lock(struct snd_ctl_file *file,
933 struct snd_ctl_elem_id __user *_id)
934 {
935 struct snd_card *card = file->card;
936 struct snd_ctl_elem_id id;
937 struct snd_kcontrol *kctl;
938 struct snd_kcontrol_volatile *vd;
939 int result;
940
941 if (copy_from_user(&id, _id, sizeof(id)))
942 return -EFAULT;
943 down_write(&card->controls_rwsem);
944 kctl = snd_ctl_find_id(card, &id);
945 if (kctl == NULL) {
946 result = -ENOENT;
947 } else {
948 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
949 if (vd->owner != NULL)
950 result = -EBUSY;
951 else {
952 vd->owner = file;
953 result = 0;
954 }
955 }
956 up_write(&card->controls_rwsem);
957 return result;
958 }
959
960 static int snd_ctl_elem_unlock(struct snd_ctl_file *file,
961 struct snd_ctl_elem_id __user *_id)
962 {
963 struct snd_card *card = file->card;
964 struct snd_ctl_elem_id id;
965 struct snd_kcontrol *kctl;
966 struct snd_kcontrol_volatile *vd;
967 int result;
968
969 if (copy_from_user(&id, _id, sizeof(id)))
970 return -EFAULT;
971 down_write(&card->controls_rwsem);
972 kctl = snd_ctl_find_id(card, &id);
973 if (kctl == NULL) {
974 result = -ENOENT;
975 } else {
976 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
977 if (vd->owner == NULL)
978 result = -EINVAL;
979 else if (vd->owner != file)
980 result = -EPERM;
981 else {
982 vd->owner = NULL;
983 result = 0;
984 }
985 }
986 up_write(&card->controls_rwsem);
987 return result;
988 }
989
990 struct user_element {
991 struct snd_ctl_elem_info info;
992 void *elem_data; /* element data */
993 unsigned long elem_data_size; /* size of element data in bytes */
994 void *tlv_data; /* TLV data */
995 unsigned long tlv_data_size; /* TLV data size */
996 void *priv_data; /* private data (like strings for enumerated type) */
997 };
998
999 static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol,
1000 struct snd_ctl_elem_info *uinfo)
1001 {
1002 struct user_element *ue = kcontrol->private_data;
1003
1004 *uinfo = ue->info;
1005 return 0;
1006 }
1007
1008 static int snd_ctl_elem_user_enum_info(struct snd_kcontrol *kcontrol,
1009 struct snd_ctl_elem_info *uinfo)
1010 {
1011 struct user_element *ue = kcontrol->private_data;
1012 const char *names;
1013 unsigned int item;
1014
1015 item = uinfo->value.enumerated.item;
1016
1017 *uinfo = ue->info;
1018
1019 item = min(item, uinfo->value.enumerated.items - 1);
1020 uinfo->value.enumerated.item = item;
1021
1022 names = ue->priv_data;
1023 for (; item > 0; --item)
1024 names += strlen(names) + 1;
1025 strcpy(uinfo->value.enumerated.name, names);
1026
1027 return 0;
1028 }
1029
1030 static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol,
1031 struct snd_ctl_elem_value *ucontrol)
1032 {
1033 struct user_element *ue = kcontrol->private_data;
1034
1035 memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size);
1036 return 0;
1037 }
1038
1039 static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol,
1040 struct snd_ctl_elem_value *ucontrol)
1041 {
1042 int change;
1043 struct user_element *ue = kcontrol->private_data;
1044
1045 change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0;
1046 if (change)
1047 memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size);
1048 return change;
1049 }
1050
1051 static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol,
1052 int op_flag,
1053 unsigned int size,
1054 unsigned int __user *tlv)
1055 {
1056 struct user_element *ue = kcontrol->private_data;
1057 int change = 0;
1058 void *new_data;
1059
1060 if (op_flag > 0) {
1061 if (size > 1024 * 128) /* sane value */
1062 return -EINVAL;
1063
1064 new_data = memdup_user(tlv, size);
1065 if (IS_ERR(new_data))
1066 return PTR_ERR(new_data);
1067 change = ue->tlv_data_size != size;
1068 if (!change)
1069 change = memcmp(ue->tlv_data, new_data, size);
1070 kfree(ue->tlv_data);
1071 ue->tlv_data = new_data;
1072 ue->tlv_data_size = size;
1073 } else {
1074 if (! ue->tlv_data_size || ! ue->tlv_data)
1075 return -ENXIO;
1076 if (size < ue->tlv_data_size)
1077 return -ENOSPC;
1078 if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size))
1079 return -EFAULT;
1080 }
1081 return change;
1082 }
1083
1084 static int snd_ctl_elem_init_enum_names(struct user_element *ue)
1085 {
1086 char *names, *p;
1087 size_t buf_len, name_len;
1088 unsigned int i;
1089 const uintptr_t user_ptrval = ue->info.value.enumerated.names_ptr;
1090
1091 if (ue->info.value.enumerated.names_length > 64 * 1024)
1092 return -EINVAL;
1093
1094 names = memdup_user((const void __user *)user_ptrval,
1095 ue->info.value.enumerated.names_length);
1096 if (IS_ERR(names))
1097 return PTR_ERR(names);
1098
1099 /* check that there are enough valid names */
1100 buf_len = ue->info.value.enumerated.names_length;
1101 p = names;
1102 for (i = 0; i < ue->info.value.enumerated.items; ++i) {
1103 name_len = strnlen(p, buf_len);
1104 if (name_len == 0 || name_len >= 64 || name_len == buf_len) {
1105 kfree(names);
1106 return -EINVAL;
1107 }
1108 p += name_len + 1;
1109 buf_len -= name_len + 1;
1110 }
1111
1112 ue->priv_data = names;
1113 ue->info.value.enumerated.names_ptr = 0;
1114
1115 return 0;
1116 }
1117
1118 static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol)
1119 {
1120 struct user_element *ue = kcontrol->private_data;
1121
1122 kfree(ue->tlv_data);
1123 kfree(ue->priv_data);
1124 kfree(ue);
1125 }
1126
1127 static int snd_ctl_elem_add(struct snd_ctl_file *file,
1128 struct snd_ctl_elem_info *info, int replace)
1129 {
1130 struct snd_card *card = file->card;
1131 struct snd_kcontrol kctl, *_kctl;
1132 unsigned int access;
1133 long private_size;
1134 struct user_element *ue;
1135 int idx, err;
1136
1137 if (!replace && card->user_ctl_count >= MAX_USER_CONTROLS)
1138 return -ENOMEM;
1139 if (info->count < 1)
1140 return -EINVAL;
1141 access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
1142 (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
1143 SNDRV_CTL_ELEM_ACCESS_INACTIVE|
1144 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE));
1145 info->id.numid = 0;
1146 memset(&kctl, 0, sizeof(kctl));
1147 down_write(&card->controls_rwsem);
1148 _kctl = snd_ctl_find_id(card, &info->id);
1149 err = 0;
1150 if (_kctl) {
1151 if (replace)
1152 err = snd_ctl_remove(card, _kctl);
1153 else
1154 err = -EBUSY;
1155 } else {
1156 if (replace)
1157 err = -ENOENT;
1158 }
1159 up_write(&card->controls_rwsem);
1160 if (err < 0)
1161 return err;
1162 memcpy(&kctl.id, &info->id, sizeof(info->id));
1163 kctl.count = info->owner ? info->owner : 1;
1164 access |= SNDRV_CTL_ELEM_ACCESS_USER;
1165 if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED)
1166 kctl.info = snd_ctl_elem_user_enum_info;
1167 else
1168 kctl.info = snd_ctl_elem_user_info;
1169 if (access & SNDRV_CTL_ELEM_ACCESS_READ)
1170 kctl.get = snd_ctl_elem_user_get;
1171 if (access & SNDRV_CTL_ELEM_ACCESS_WRITE)
1172 kctl.put = snd_ctl_elem_user_put;
1173 if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) {
1174 kctl.tlv.c = snd_ctl_elem_user_tlv;
1175 access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1176 }
1177 switch (info->type) {
1178 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
1179 case SNDRV_CTL_ELEM_TYPE_INTEGER:
1180 private_size = sizeof(long);
1181 if (info->count > 128)
1182 return -EINVAL;
1183 break;
1184 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
1185 private_size = sizeof(long long);
1186 if (info->count > 64)
1187 return -EINVAL;
1188 break;
1189 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
1190 private_size = sizeof(unsigned int);
1191 if (info->count > 128 || info->value.enumerated.items == 0)
1192 return -EINVAL;
1193 break;
1194 case SNDRV_CTL_ELEM_TYPE_BYTES:
1195 private_size = sizeof(unsigned char);
1196 if (info->count > 512)
1197 return -EINVAL;
1198 break;
1199 case SNDRV_CTL_ELEM_TYPE_IEC958:
1200 private_size = sizeof(struct snd_aes_iec958);
1201 if (info->count != 1)
1202 return -EINVAL;
1203 break;
1204 default:
1205 return -EINVAL;
1206 }
1207 private_size *= info->count;
1208 ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL);
1209 if (ue == NULL)
1210 return -ENOMEM;
1211 ue->info = *info;
1212 ue->info.access = 0;
1213 ue->elem_data = (char *)ue + sizeof(*ue);
1214 ue->elem_data_size = private_size;
1215 if (ue->info.type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) {
1216 err = snd_ctl_elem_init_enum_names(ue);
1217 if (err < 0) {
1218 kfree(ue);
1219 return err;
1220 }
1221 }
1222 kctl.private_free = snd_ctl_elem_user_free;
1223 _kctl = snd_ctl_new(&kctl, access);
1224 if (_kctl == NULL) {
1225 kfree(ue->priv_data);
1226 kfree(ue);
1227 return -ENOMEM;
1228 }
1229 _kctl->private_data = ue;
1230 for (idx = 0; idx < _kctl->count; idx++)
1231 _kctl->vd[idx].owner = file;
1232 err = snd_ctl_add(card, _kctl);
1233 if (err < 0)
1234 return err;
1235
1236 down_write(&card->controls_rwsem);
1237 card->user_ctl_count++;
1238 up_write(&card->controls_rwsem);
1239
1240 return 0;
1241 }
1242
1243 static int snd_ctl_elem_add_user(struct snd_ctl_file *file,
1244 struct snd_ctl_elem_info __user *_info, int replace)
1245 {
1246 struct snd_ctl_elem_info info;
1247 if (copy_from_user(&info, _info, sizeof(info)))
1248 return -EFAULT;
1249 return snd_ctl_elem_add(file, &info, replace);
1250 }
1251
1252 static int snd_ctl_elem_remove(struct snd_ctl_file *file,
1253 struct snd_ctl_elem_id __user *_id)
1254 {
1255 struct snd_ctl_elem_id id;
1256
1257 if (copy_from_user(&id, _id, sizeof(id)))
1258 return -EFAULT;
1259 return snd_ctl_remove_user_ctl(file, &id);
1260 }
1261
1262 static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr)
1263 {
1264 int subscribe;
1265 if (get_user(subscribe, ptr))
1266 return -EFAULT;
1267 if (subscribe < 0) {
1268 subscribe = file->subscribed;
1269 if (put_user(subscribe, ptr))
1270 return -EFAULT;
1271 return 0;
1272 }
1273 if (subscribe) {
1274 file->subscribed = 1;
1275 return 0;
1276 } else if (file->subscribed) {
1277 snd_ctl_empty_read_queue(file);
1278 file->subscribed = 0;
1279 }
1280 return 0;
1281 }
1282
1283 static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file,
1284 struct snd_ctl_tlv __user *_tlv,
1285 int op_flag)
1286 {
1287 struct snd_card *card = file->card;
1288 struct snd_ctl_tlv tlv;
1289 struct snd_kcontrol *kctl;
1290 struct snd_kcontrol_volatile *vd;
1291 unsigned int len;
1292 int err = 0;
1293
1294 if (copy_from_user(&tlv, _tlv, sizeof(tlv)))
1295 return -EFAULT;
1296 if (tlv.length < sizeof(unsigned int) * 2)
1297 return -EINVAL;
1298 down_read(&card->controls_rwsem);
1299 kctl = snd_ctl_find_numid(card, tlv.numid);
1300 if (kctl == NULL) {
1301 err = -ENOENT;
1302 goto __kctl_end;
1303 }
1304 if (kctl->tlv.p == NULL) {
1305 err = -ENXIO;
1306 goto __kctl_end;
1307 }
1308 vd = &kctl->vd[tlv.numid - kctl->id.numid];
1309 if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) ||
1310 (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) ||
1311 (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) {
1312 err = -ENXIO;
1313 goto __kctl_end;
1314 }
1315 if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) {
1316 if (vd->owner != NULL && vd->owner != file) {
1317 err = -EPERM;
1318 goto __kctl_end;
1319 }
1320 err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv);
1321 if (err > 0) {
1322 up_read(&card->controls_rwsem);
1323 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id);
1324 return 0;
1325 }
1326 } else {
1327 if (op_flag) {
1328 err = -ENXIO;
1329 goto __kctl_end;
1330 }
1331 len = kctl->tlv.p[1] + 2 * sizeof(unsigned int);
1332 if (tlv.length < len) {
1333 err = -ENOMEM;
1334 goto __kctl_end;
1335 }
1336 if (copy_to_user(_tlv->tlv, kctl->tlv.p, len))
1337 err = -EFAULT;
1338 }
1339 __kctl_end:
1340 up_read(&card->controls_rwsem);
1341 return err;
1342 }
1343
1344 static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1345 {
1346 struct snd_ctl_file *ctl;
1347 struct snd_card *card;
1348 struct snd_kctl_ioctl *p;
1349 void __user *argp = (void __user *)arg;
1350 int __user *ip = argp;
1351 int err;
1352
1353 ctl = file->private_data;
1354 card = ctl->card;
1355 if (snd_BUG_ON(!card))
1356 return -ENXIO;
1357 switch (cmd) {
1358 case SNDRV_CTL_IOCTL_PVERSION:
1359 return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0;
1360 case SNDRV_CTL_IOCTL_CARD_INFO:
1361 return snd_ctl_card_info(card, ctl, cmd, argp);
1362 case SNDRV_CTL_IOCTL_ELEM_LIST:
1363 return snd_ctl_elem_list(card, argp);
1364 case SNDRV_CTL_IOCTL_ELEM_INFO:
1365 return snd_ctl_elem_info_user(ctl, argp);
1366 case SNDRV_CTL_IOCTL_ELEM_READ:
1367 return snd_ctl_elem_read_user(card, argp);
1368 case SNDRV_CTL_IOCTL_ELEM_WRITE:
1369 return snd_ctl_elem_write_user(ctl, argp);
1370 case SNDRV_CTL_IOCTL_ELEM_LOCK:
1371 return snd_ctl_elem_lock(ctl, argp);
1372 case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
1373 return snd_ctl_elem_unlock(ctl, argp);
1374 case SNDRV_CTL_IOCTL_ELEM_ADD:
1375 return snd_ctl_elem_add_user(ctl, argp, 0);
1376 case SNDRV_CTL_IOCTL_ELEM_REPLACE:
1377 return snd_ctl_elem_add_user(ctl, argp, 1);
1378 case SNDRV_CTL_IOCTL_ELEM_REMOVE:
1379 return snd_ctl_elem_remove(ctl, argp);
1380 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
1381 return snd_ctl_subscribe_events(ctl, ip);
1382 case SNDRV_CTL_IOCTL_TLV_READ:
1383 return snd_ctl_tlv_ioctl(ctl, argp, 0);
1384 case SNDRV_CTL_IOCTL_TLV_WRITE:
1385 return snd_ctl_tlv_ioctl(ctl, argp, 1);
1386 case SNDRV_CTL_IOCTL_TLV_COMMAND:
1387 return snd_ctl_tlv_ioctl(ctl, argp, -1);
1388 case SNDRV_CTL_IOCTL_POWER:
1389 return -ENOPROTOOPT;
1390 case SNDRV_CTL_IOCTL_POWER_STATE:
1391 #ifdef CONFIG_PM
1392 return put_user(card->power_state, ip) ? -EFAULT : 0;
1393 #else
1394 return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0;
1395 #endif
1396 }
1397 down_read(&snd_ioctl_rwsem);
1398 list_for_each_entry(p, &snd_control_ioctls, list) {
1399 err = p->fioctl(card, ctl, cmd, arg);
1400 if (err != -ENOIOCTLCMD) {
1401 up_read(&snd_ioctl_rwsem);
1402 return err;
1403 }
1404 }
1405 up_read(&snd_ioctl_rwsem);
1406 snd_printdd("unknown ioctl = 0x%x\n", cmd);
1407 return -ENOTTY;
1408 }
1409
1410 static ssize_t snd_ctl_read(struct file *file, char __user *buffer,
1411 size_t count, loff_t * offset)
1412 {
1413 struct snd_ctl_file *ctl;
1414 int err = 0;
1415 ssize_t result = 0;
1416
1417 ctl = file->private_data;
1418 if (snd_BUG_ON(!ctl || !ctl->card))
1419 return -ENXIO;
1420 if (!ctl->subscribed)
1421 return -EBADFD;
1422 if (count < sizeof(struct snd_ctl_event))
1423 return -EINVAL;
1424 spin_lock_irq(&ctl->read_lock);
1425 while (count >= sizeof(struct snd_ctl_event)) {
1426 struct snd_ctl_event ev;
1427 struct snd_kctl_event *kev;
1428 while (list_empty(&ctl->events)) {
1429 wait_queue_t wait;
1430 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1431 err = -EAGAIN;
1432 goto __end_lock;
1433 }
1434 init_waitqueue_entry(&wait, current);
1435 add_wait_queue(&ctl->change_sleep, &wait);
1436 set_current_state(TASK_INTERRUPTIBLE);
1437 spin_unlock_irq(&ctl->read_lock);
1438 schedule();
1439 remove_wait_queue(&ctl->change_sleep, &wait);
1440 if (ctl->card->shutdown)
1441 return -ENODEV;
1442 if (signal_pending(current))
1443 return -ERESTARTSYS;
1444 spin_lock_irq(&ctl->read_lock);
1445 }
1446 kev = snd_kctl_event(ctl->events.next);
1447 ev.type = SNDRV_CTL_EVENT_ELEM;
1448 ev.data.elem.mask = kev->mask;
1449 ev.data.elem.id = kev->id;
1450 list_del(&kev->list);
1451 spin_unlock_irq(&ctl->read_lock);
1452 kfree(kev);
1453 if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) {
1454 err = -EFAULT;
1455 goto __end;
1456 }
1457 spin_lock_irq(&ctl->read_lock);
1458 buffer += sizeof(struct snd_ctl_event);
1459 count -= sizeof(struct snd_ctl_event);
1460 result += sizeof(struct snd_ctl_event);
1461 }
1462 __end_lock:
1463 spin_unlock_irq(&ctl->read_lock);
1464 __end:
1465 return result > 0 ? result : err;
1466 }
1467
1468 static unsigned int snd_ctl_poll(struct file *file, poll_table * wait)
1469 {
1470 unsigned int mask;
1471 struct snd_ctl_file *ctl;
1472
1473 ctl = file->private_data;
1474 if (!ctl->subscribed)
1475 return 0;
1476 poll_wait(file, &ctl->change_sleep, wait);
1477
1478 mask = 0;
1479 if (!list_empty(&ctl->events))
1480 mask |= POLLIN | POLLRDNORM;
1481
1482 return mask;
1483 }
1484
1485 /*
1486 * register the device-specific control-ioctls.
1487 * called from each device manager like pcm.c, hwdep.c, etc.
1488 */
1489 static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists)
1490 {
1491 struct snd_kctl_ioctl *pn;
1492
1493 pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL);
1494 if (pn == NULL)
1495 return -ENOMEM;
1496 pn->fioctl = fcn;
1497 down_write(&snd_ioctl_rwsem);
1498 list_add_tail(&pn->list, lists);
1499 up_write(&snd_ioctl_rwsem);
1500 return 0;
1501 }
1502
1503 int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn)
1504 {
1505 return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls);
1506 }
1507
1508 EXPORT_SYMBOL(snd_ctl_register_ioctl);
1509
1510 #ifdef CONFIG_COMPAT
1511 int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1512 {
1513 return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls);
1514 }
1515
1516 EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
1517 #endif
1518
1519 /*
1520 * de-register the device-specific control-ioctls.
1521 */
1522 static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn,
1523 struct list_head *lists)
1524 {
1525 struct snd_kctl_ioctl *p;
1526
1527 if (snd_BUG_ON(!fcn))
1528 return -EINVAL;
1529 down_write(&snd_ioctl_rwsem);
1530 list_for_each_entry(p, lists, list) {
1531 if (p->fioctl == fcn) {
1532 list_del(&p->list);
1533 up_write(&snd_ioctl_rwsem);
1534 kfree(p);
1535 return 0;
1536 }
1537 }
1538 up_write(&snd_ioctl_rwsem);
1539 snd_BUG();
1540 return -EINVAL;
1541 }
1542
1543 int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn)
1544 {
1545 return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls);
1546 }
1547
1548 EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
1549
1550 #ifdef CONFIG_COMPAT
1551 int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1552 {
1553 return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls);
1554 }
1555
1556 EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
1557 #endif
1558
1559 static int snd_ctl_fasync(int fd, struct file * file, int on)
1560 {
1561 struct snd_ctl_file *ctl;
1562
1563 ctl = file->private_data;
1564 return fasync_helper(fd, file, on, &ctl->fasync);
1565 }
1566
1567 /*
1568 * ioctl32 compat
1569 */
1570 #ifdef CONFIG_COMPAT
1571 #include "control_compat.c"
1572 #else
1573 #define snd_ctl_ioctl_compat NULL
1574 #endif
1575
1576 /*
1577 * INIT PART
1578 */
1579
1580 static const struct file_operations snd_ctl_f_ops =
1581 {
1582 .owner = THIS_MODULE,
1583 .read = snd_ctl_read,
1584 .open = snd_ctl_open,
1585 .release = snd_ctl_release,
1586 .llseek = no_llseek,
1587 .poll = snd_ctl_poll,
1588 .unlocked_ioctl = snd_ctl_ioctl,
1589 .compat_ioctl = snd_ctl_ioctl_compat,
1590 .fasync = snd_ctl_fasync,
1591 };
1592
1593 /*
1594 * registration of the control device
1595 */
1596 static int snd_ctl_dev_register(struct snd_device *device)
1597 {
1598 struct snd_card *card = device->device_data;
1599 int err, cardnum;
1600 char name[16];
1601
1602 if (snd_BUG_ON(!card))
1603 return -ENXIO;
1604 cardnum = card->number;
1605 if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1606 return -ENXIO;
1607 sprintf(name, "controlC%i", cardnum);
1608 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
1609 &snd_ctl_f_ops, card, name)) < 0)
1610 return err;
1611 return 0;
1612 }
1613
1614 /*
1615 * disconnection of the control device
1616 */
1617 static int snd_ctl_dev_disconnect(struct snd_device *device)
1618 {
1619 struct snd_card *card = device->device_data;
1620 struct snd_ctl_file *ctl;
1621 int err, cardnum;
1622
1623 if (snd_BUG_ON(!card))
1624 return -ENXIO;
1625 cardnum = card->number;
1626 if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1627 return -ENXIO;
1628
1629 read_lock(&card->ctl_files_rwlock);
1630 list_for_each_entry(ctl, &card->ctl_files, list) {
1631 wake_up(&ctl->change_sleep);
1632 kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);
1633 }
1634 read_unlock(&card->ctl_files_rwlock);
1635
1636 if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL,
1637 card, -1)) < 0)
1638 return err;
1639 return 0;
1640 }
1641
1642 /*
1643 * free all controls
1644 */
1645 static int snd_ctl_dev_free(struct snd_device *device)
1646 {
1647 struct snd_card *card = device->device_data;
1648 struct snd_kcontrol *control;
1649
1650 down_write(&card->controls_rwsem);
1651 while (!list_empty(&card->controls)) {
1652 control = snd_kcontrol(card->controls.next);
1653 snd_ctl_remove(card, control);
1654 }
1655 up_write(&card->controls_rwsem);
1656 return 0;
1657 }
1658
1659 /*
1660 * create control core:
1661 * called from init.c
1662 */
1663 int snd_ctl_create(struct snd_card *card)
1664 {
1665 static struct snd_device_ops ops = {
1666 .dev_free = snd_ctl_dev_free,
1667 .dev_register = snd_ctl_dev_register,
1668 .dev_disconnect = snd_ctl_dev_disconnect,
1669 };
1670
1671 if (snd_BUG_ON(!card))
1672 return -ENXIO;
1673 return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);
1674 }
1675
1676 /*
1677 * Frequently used control callbacks/helpers
1678 */
1679 int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
1680 struct snd_ctl_elem_info *uinfo)
1681 {
1682 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1683 uinfo->count = 1;
1684 uinfo->value.integer.min = 0;
1685 uinfo->value.integer.max = 1;
1686 return 0;
1687 }
1688
1689 EXPORT_SYMBOL(snd_ctl_boolean_mono_info);
1690
1691 int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
1692 struct snd_ctl_elem_info *uinfo)
1693 {
1694 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1695 uinfo->count = 2;
1696 uinfo->value.integer.min = 0;
1697 uinfo->value.integer.max = 1;
1698 return 0;
1699 }
1700
1701 EXPORT_SYMBOL(snd_ctl_boolean_stereo_info);
1702
1703 /**
1704 * snd_ctl_enum_info - fills the info structure for an enumerated control
1705 * @info: the structure to be filled
1706 * @channels: the number of the control's channels; often one
1707 * @items: the number of control values; also the size of @names
1708 * @names: an array containing the names of all control values
1709 *
1710 * Sets all required fields in @info to their appropriate values.
1711 * If the control's accessibility is not the default (readable and writable),
1712 * the caller has to fill @info->access.
1713 */
1714 int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels,
1715 unsigned int items, const char *const names[])
1716 {
1717 info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
1718 info->count = channels;
1719 info->value.enumerated.items = items;
1720 if (info->value.enumerated.item >= items)
1721 info->value.enumerated.item = items - 1;
1722 strlcpy(info->value.enumerated.name,
1723 names[info->value.enumerated.item],
1724 sizeof(info->value.enumerated.name));
1725 return 0;
1726 }
1727 EXPORT_SYMBOL(snd_ctl_enum_info);
CRIS linux kernel tree