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Merge remote-tracking branch 'moduleh/module.h-split'
[linux-2.6/next.git] / sound / core / control.c
blob04e068ce321a8bb7772b700aa0926d0e86a7c01d
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 return 0;
90
91 __error:
92 module_put(card->module);
93 __error2:
94 snd_card_file_remove(card, file);
95 __error1:
96 return err;
97 }
98
99 static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl)
100 {
101 unsigned long flags;
102 struct snd_kctl_event *cread;
103
104 spin_lock_irqsave(&ctl->read_lock, flags);
105 while (!list_empty(&ctl->events)) {
106 cread = snd_kctl_event(ctl->events.next);
107 list_del(&cread->list);
108 kfree(cread);
109 }
110 spin_unlock_irqrestore(&ctl->read_lock, flags);
111 }
112
113 static int snd_ctl_release(struct inode *inode, struct file *file)
114 {
115 unsigned long flags;
116 struct snd_card *card;
117 struct snd_ctl_file *ctl;
118 struct snd_kcontrol *control;
119 unsigned int idx;
120
121 ctl = file->private_data;
122 file->private_data = NULL;
123 card = ctl->card;
124 write_lock_irqsave(&card->ctl_files_rwlock, flags);
125 list_del(&ctl->list);
126 write_unlock_irqrestore(&card->ctl_files_rwlock, flags);
127 down_write(&card->controls_rwsem);
128 list_for_each_entry(control, &card->controls, list)
129 for (idx = 0; idx < control->count; idx++)
130 if (control->vd[idx].owner == ctl)
131 control->vd[idx].owner = NULL;
132 up_write(&card->controls_rwsem);
133 snd_ctl_empty_read_queue(ctl);
134 put_pid(ctl->pid);
135 kfree(ctl);
136 module_put(card->module);
137 snd_card_file_remove(card, file);
138 return 0;
139 }
140
141 void snd_ctl_notify(struct snd_card *card, unsigned int mask,
142 struct snd_ctl_elem_id *id)
143 {
144 unsigned long flags;
145 struct snd_ctl_file *ctl;
146 struct snd_kctl_event *ev;
147
148 if (snd_BUG_ON(!card || !id))
149 return;
150 read_lock(&card->ctl_files_rwlock);
151 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
152 card->mixer_oss_change_count++;
153 #endif
154 list_for_each_entry(ctl, &card->ctl_files, list) {
155 if (!ctl->subscribed)
156 continue;
157 spin_lock_irqsave(&ctl->read_lock, flags);
158 list_for_each_entry(ev, &ctl->events, list) {
159 if (ev->id.numid == id->numid) {
160 ev->mask |= mask;
161 goto _found;
162 }
163 }
164 ev = kzalloc(sizeof(*ev), GFP_ATOMIC);
165 if (ev) {
166 ev->id = *id;
167 ev->mask = mask;
168 list_add_tail(&ev->list, &ctl->events);
169 } else {
170 snd_printk(KERN_ERR "No memory available to allocate event\n");
171 }
172 _found:
173 wake_up(&ctl->change_sleep);
174 spin_unlock_irqrestore(&ctl->read_lock, flags);
175 kill_fasync(&ctl->fasync, SIGIO, POLL_IN);
176 }
177 read_unlock(&card->ctl_files_rwlock);
178 }
179
180 EXPORT_SYMBOL(snd_ctl_notify);
181
182 /**
183 * snd_ctl_new - create a control instance from the template
184 * @control: the control template
185 * @access: the default control access
186 *
187 * Allocates a new struct snd_kcontrol instance and copies the given template
188 * to the new instance. It does not copy volatile data (access).
189 *
190 * Returns the pointer of the new instance, or NULL on failure.
191 */
192 static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control,
193 unsigned int access)
194 {
195 struct snd_kcontrol *kctl;
196 unsigned int idx;
197
198 if (snd_BUG_ON(!control || !control->count))
199 return NULL;
200
201 if (control->count > MAX_CONTROL_COUNT)
202 return NULL;
203
204 kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL);
205 if (kctl == NULL) {
206 snd_printk(KERN_ERR "Cannot allocate control instance\n");
207 return NULL;
208 }
209 *kctl = *control;
210 for (idx = 0; idx < kctl->count; idx++)
211 kctl->vd[idx].access = access;
212 return kctl;
213 }
214
215 /**
216 * snd_ctl_new1 - create a control instance from the template
217 * @ncontrol: the initialization record
218 * @private_data: the private data to set
219 *
220 * Allocates a new struct snd_kcontrol instance and initialize from the given
221 * template. When the access field of ncontrol is 0, it's assumed as
222 * READWRITE access. When the count field is 0, it's assumes as one.
223 *
224 * Returns the pointer of the newly generated instance, or NULL on failure.
225 */
226 struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol,
227 void *private_data)
228 {
229 struct snd_kcontrol kctl;
230 unsigned int access;
231
232 if (snd_BUG_ON(!ncontrol || !ncontrol->info))
233 return NULL;
234 memset(&kctl, 0, sizeof(kctl));
235 kctl.id.iface = ncontrol->iface;
236 kctl.id.device = ncontrol->device;
237 kctl.id.subdevice = ncontrol->subdevice;
238 if (ncontrol->name) {
239 strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name));
240 if (strcmp(ncontrol->name, kctl.id.name) != 0)
241 snd_printk(KERN_WARNING
242 "Control name '%s' truncated to '%s'\n",
243 ncontrol->name, kctl.id.name);
244 }
245 kctl.id.index = ncontrol->index;
246 kctl.count = ncontrol->count ? ncontrol->count : 1;
247 access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
248 (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
249 SNDRV_CTL_ELEM_ACCESS_INACTIVE|
250 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE|
251 SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND|
252 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK));
253 kctl.info = ncontrol->info;
254 kctl.get = ncontrol->get;
255 kctl.put = ncontrol->put;
256 kctl.tlv.p = ncontrol->tlv.p;
257 kctl.private_value = ncontrol->private_value;
258 kctl.private_data = private_data;
259 return snd_ctl_new(&kctl, access);
260 }
261
262 EXPORT_SYMBOL(snd_ctl_new1);
263
264 /**
265 * snd_ctl_free_one - release the control instance
266 * @kcontrol: the control instance
267 *
268 * Releases the control instance created via snd_ctl_new()
269 * or snd_ctl_new1().
270 * Don't call this after the control was added to the card.
271 */
272 void snd_ctl_free_one(struct snd_kcontrol *kcontrol)
273 {
274 if (kcontrol) {
275 if (kcontrol->private_free)
276 kcontrol->private_free(kcontrol);
277 kfree(kcontrol);
278 }
279 }
280
281 EXPORT_SYMBOL(snd_ctl_free_one);
282
283 static bool snd_ctl_remove_numid_conflict(struct snd_card *card,
284 unsigned int count)
285 {
286 struct snd_kcontrol *kctl;
287
288 list_for_each_entry(kctl, &card->controls, list) {
289 if (kctl->id.numid < card->last_numid + 1 + count &&
290 kctl->id.numid + kctl->count > card->last_numid + 1) {
291 card->last_numid = kctl->id.numid + kctl->count - 1;
292 return true;
293 }
294 }
295 return false;
296 }
297
298 static int snd_ctl_find_hole(struct snd_card *card, unsigned int count)
299 {
300 unsigned int iter = 100000;
301
302 while (snd_ctl_remove_numid_conflict(card, count)) {
303 if (--iter == 0) {
304 /* this situation is very unlikely */
305 snd_printk(KERN_ERR "unable to allocate new control numid\n");
306 return -ENOMEM;
307 }
308 }
309 return 0;
310 }
311
312 /**
313 * snd_ctl_add - add the control instance to the card
314 * @card: the card instance
315 * @kcontrol: the control instance to add
316 *
317 * Adds the control instance created via snd_ctl_new() or
318 * snd_ctl_new1() to the given card. Assigns also an unique
319 * numid used for fast search.
320 *
321 * Returns zero if successful, or a negative error code on failure.
322 *
323 * It frees automatically the control which cannot be added.
324 */
325 int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
326 {
327 struct snd_ctl_elem_id id;
328 unsigned int idx;
329 int err = -EINVAL;
330
331 if (! kcontrol)
332 return err;
333 if (snd_BUG_ON(!card || !kcontrol->info))
334 goto error;
335 id = kcontrol->id;
336 down_write(&card->controls_rwsem);
337 if (snd_ctl_find_id(card, &id)) {
338 up_write(&card->controls_rwsem);
339 snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n",
340 id.iface,
341 id.device,
342 id.subdevice,
343 id.name,
344 id.index);
345 err = -EBUSY;
346 goto error;
347 }
348 if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
349 up_write(&card->controls_rwsem);
350 err = -ENOMEM;
351 goto error;
352 }
353 list_add_tail(&kcontrol->list, &card->controls);
354 card->controls_count += kcontrol->count;
355 kcontrol->id.numid = card->last_numid + 1;
356 card->last_numid += kcontrol->count;
357 up_write(&card->controls_rwsem);
358 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
359 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
360 return 0;
361
362 error:
363 snd_ctl_free_one(kcontrol);
364 return err;
365 }
366
367 EXPORT_SYMBOL(snd_ctl_add);
368
369 /**
370 * snd_ctl_replace - replace the control instance of the card
371 * @card: the card instance
372 * @kcontrol: the control instance to replace
373 * @add_on_replace: add the control if not already added
374 *
375 * Replaces the given control. If the given control does not exist
376 * and the add_on_replace flag is set, the control is added. If the
377 * control exists, it is destroyed first.
378 *
379 * Returns zero if successful, or a negative error code on failure.
380 *
381 * It frees automatically the control which cannot be added or replaced.
382 */
383 int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol,
384 bool add_on_replace)
385 {
386 struct snd_ctl_elem_id id;
387 unsigned int idx;
388 struct snd_kcontrol *old;
389 int ret;
390
391 if (!kcontrol)
392 return -EINVAL;
393 if (snd_BUG_ON(!card || !kcontrol->info)) {
394 ret = -EINVAL;
395 goto error;
396 }
397 id = kcontrol->id;
398 down_write(&card->controls_rwsem);
399 old = snd_ctl_find_id(card, &id);
400 if (!old) {
401 if (add_on_replace)
402 goto add;
403 up_write(&card->controls_rwsem);
404 ret = -EINVAL;
405 goto error;
406 }
407 ret = snd_ctl_remove(card, old);
408 if (ret < 0) {
409 up_write(&card->controls_rwsem);
410 goto error;
411 }
412 add:
413 if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
414 up_write(&card->controls_rwsem);
415 ret = -ENOMEM;
416 goto error;
417 }
418 list_add_tail(&kcontrol->list, &card->controls);
419 card->controls_count += kcontrol->count;
420 kcontrol->id.numid = card->last_numid + 1;
421 card->last_numid += kcontrol->count;
422 up_write(&card->controls_rwsem);
423 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
424 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
425 return 0;
426
427 error:
428 snd_ctl_free_one(kcontrol);
429 return ret;
430 }
431 EXPORT_SYMBOL(snd_ctl_replace);
432
433 /**
434 * snd_ctl_remove - remove the control from the card and release it
435 * @card: the card instance
436 * @kcontrol: the control instance to remove
437 *
438 * Removes the control from the card and then releases the instance.
439 * You don't need to call snd_ctl_free_one(). You must be in
440 * the write lock - down_write(&card->controls_rwsem).
441 *
442 * Returns 0 if successful, or a negative error code on failure.
443 */
444 int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol)
445 {
446 struct snd_ctl_elem_id id;
447 unsigned int idx;
448
449 if (snd_BUG_ON(!card || !kcontrol))
450 return -EINVAL;
451 list_del(&kcontrol->list);
452 card->controls_count -= kcontrol->count;
453 id = kcontrol->id;
454 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
455 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id);
456 snd_ctl_free_one(kcontrol);
457 return 0;
458 }
459
460 EXPORT_SYMBOL(snd_ctl_remove);
461
462 /**
463 * snd_ctl_remove_id - remove the control of the given id and release it
464 * @card: the card instance
465 * @id: the control id to remove
466 *
467 * Finds the control instance with the given id, removes it from the
468 * card list and releases it.
469 *
470 * Returns 0 if successful, or a negative error code on failure.
471 */
472 int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id)
473 {
474 struct snd_kcontrol *kctl;
475 int ret;
476
477 down_write(&card->controls_rwsem);
478 kctl = snd_ctl_find_id(card, id);
479 if (kctl == NULL) {
480 up_write(&card->controls_rwsem);
481 return -ENOENT;
482 }
483 ret = snd_ctl_remove(card, kctl);
484 up_write(&card->controls_rwsem);
485 return ret;
486 }
487
488 EXPORT_SYMBOL(snd_ctl_remove_id);
489
490 /**
491 * snd_ctl_remove_user_ctl - remove and release the unlocked user control
492 * @file: active control handle
493 * @id: the control id to remove
494 *
495 * Finds the control instance with the given id, removes it from the
496 * card list and releases it.
497 *
498 * Returns 0 if successful, or a negative error code on failure.
499 */
500 static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file,
501 struct snd_ctl_elem_id *id)
502 {
503 struct snd_card *card = file->card;
504 struct snd_kcontrol *kctl;
505 int idx, ret;
506
507 down_write(&card->controls_rwsem);
508 kctl = snd_ctl_find_id(card, id);
509 if (kctl == NULL) {
510 ret = -ENOENT;
511 goto error;
512 }
513 if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) {
514 ret = -EINVAL;
515 goto error;
516 }
517 for (idx = 0; idx < kctl->count; idx++)
518 if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {
519 ret = -EBUSY;
520 goto error;
521 }
522 ret = snd_ctl_remove(card, kctl);
523 if (ret < 0)
524 goto error;
525 card->user_ctl_count--;
526 error:
527 up_write(&card->controls_rwsem);
528 return ret;
529 }
530
531 /**
532 * snd_ctl_activate_id - activate/inactivate the control of the given id
533 * @card: the card instance
534 * @id: the control id to activate/inactivate
535 * @active: non-zero to activate
536 *
537 * Finds the control instance with the given id, and activate or
538 * inactivate the control together with notification, if changed.
539 *
540 * Returns 0 if unchanged, 1 if changed, or a negative error code on failure.
541 */
542 int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id,
543 int active)
544 {
545 struct snd_kcontrol *kctl;
546 struct snd_kcontrol_volatile *vd;
547 unsigned int index_offset;
548 int ret;
549
550 down_write(&card->controls_rwsem);
551 kctl = snd_ctl_find_id(card, id);
552 if (kctl == NULL) {
553 ret = -ENOENT;
554 goto unlock;
555 }
556 index_offset = snd_ctl_get_ioff(kctl, &kctl->id);
557 vd = &kctl->vd[index_offset];
558 ret = 0;
559 if (active) {
560 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE))
561 goto unlock;
562 vd->access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
563 } else {
564 if (vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)
565 goto unlock;
566 vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
567 }
568 ret = 1;
569 unlock:
570 up_write(&card->controls_rwsem);
571 if (ret > 0)
572 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, id);
573 return ret;
574 }
575 EXPORT_SYMBOL_GPL(snd_ctl_activate_id);
576
577 /**
578 * snd_ctl_rename_id - replace the id of a control on the card
579 * @card: the card instance
580 * @src_id: the old id
581 * @dst_id: the new id
582 *
583 * Finds the control with the old id from the card, and replaces the
584 * id with the new one.
585 *
586 * Returns zero if successful, or a negative error code on failure.
587 */
588 int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id,
589 struct snd_ctl_elem_id *dst_id)
590 {
591 struct snd_kcontrol *kctl;
592
593 down_write(&card->controls_rwsem);
594 kctl = snd_ctl_find_id(card, src_id);
595 if (kctl == NULL) {
596 up_write(&card->controls_rwsem);
597 return -ENOENT;
598 }
599 kctl->id = *dst_id;
600 kctl->id.numid = card->last_numid + 1;
601 card->last_numid += kctl->count;
602 up_write(&card->controls_rwsem);
603 return 0;
604 }
605
606 EXPORT_SYMBOL(snd_ctl_rename_id);
607
608 /**
609 * snd_ctl_find_numid - find the control instance with the given number-id
610 * @card: the card instance
611 * @numid: the number-id to search
612 *
613 * Finds the control instance with the given number-id from the card.
614 *
615 * Returns the pointer of the instance if found, or NULL if not.
616 *
617 * The caller must down card->controls_rwsem before calling this function
618 * (if the race condition can happen).
619 */
620 struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid)
621 {
622 struct snd_kcontrol *kctl;
623
624 if (snd_BUG_ON(!card || !numid))
625 return NULL;
626 list_for_each_entry(kctl, &card->controls, list) {
627 if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid)
628 return kctl;
629 }
630 return NULL;
631 }
632
633 EXPORT_SYMBOL(snd_ctl_find_numid);
634
635 /**
636 * snd_ctl_find_id - find the control instance with the given id
637 * @card: the card instance
638 * @id: the id to search
639 *
640 * Finds the control instance with the given id from the card.
641 *
642 * Returns the pointer of the instance if found, or NULL if not.
643 *
644 * The caller must down card->controls_rwsem before calling this function
645 * (if the race condition can happen).
646 */
647 struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card,
648 struct snd_ctl_elem_id *id)
649 {
650 struct snd_kcontrol *kctl;
651
652 if (snd_BUG_ON(!card || !id))
653 return NULL;
654 if (id->numid != 0)
655 return snd_ctl_find_numid(card, id->numid);
656 list_for_each_entry(kctl, &card->controls, list) {
657 if (kctl->id.iface != id->iface)
658 continue;
659 if (kctl->id.device != id->device)
660 continue;
661 if (kctl->id.subdevice != id->subdevice)
662 continue;
663 if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name)))
664 continue;
665 if (kctl->id.index > id->index)
666 continue;
667 if (kctl->id.index + kctl->count <= id->index)
668 continue;
669 return kctl;
670 }
671 return NULL;
672 }
673
674 EXPORT_SYMBOL(snd_ctl_find_id);
675
676 static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,
677 unsigned int cmd, void __user *arg)
678 {
679 struct snd_ctl_card_info *info;
680
681 info = kzalloc(sizeof(*info), GFP_KERNEL);
682 if (! info)
683 return -ENOMEM;
684 down_read(&snd_ioctl_rwsem);
685 info->card = card->number;
686 strlcpy(info->id, card->id, sizeof(info->id));
687 strlcpy(info->driver, card->driver, sizeof(info->driver));
688 strlcpy(info->name, card->shortname, sizeof(info->name));
689 strlcpy(info->longname, card->longname, sizeof(info->longname));
690 strlcpy(info->mixername, card->mixername, sizeof(info->mixername));
691 strlcpy(info->components, card->components, sizeof(info->components));
692 up_read(&snd_ioctl_rwsem);
693 if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) {
694 kfree(info);
695 return -EFAULT;
696 }
697 kfree(info);
698 return 0;
699 }
700
701 static int snd_ctl_elem_list(struct snd_card *card,
702 struct snd_ctl_elem_list __user *_list)
703 {
704 struct list_head *plist;
705 struct snd_ctl_elem_list list;
706 struct snd_kcontrol *kctl;
707 struct snd_ctl_elem_id *dst, *id;
708 unsigned int offset, space, jidx;
709
710 if (copy_from_user(&list, _list, sizeof(list)))
711 return -EFAULT;
712 offset = list.offset;
713 space = list.space;
714 /* try limit maximum space */
715 if (space > 16384)
716 return -ENOMEM;
717 if (space > 0) {
718 /* allocate temporary buffer for atomic operation */
719 dst = vmalloc(space * sizeof(struct snd_ctl_elem_id));
720 if (dst == NULL)
721 return -ENOMEM;
722 down_read(&card->controls_rwsem);
723 list.count = card->controls_count;
724 plist = card->controls.next;
725 while (plist != &card->controls) {
726 if (offset == 0)
727 break;
728 kctl = snd_kcontrol(plist);
729 if (offset < kctl->count)
730 break;
731 offset -= kctl->count;
732 plist = plist->next;
733 }
734 list.used = 0;
735 id = dst;
736 while (space > 0 && plist != &card->controls) {
737 kctl = snd_kcontrol(plist);
738 for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) {
739 snd_ctl_build_ioff(id, kctl, jidx);
740 id++;
741 space--;
742 list.used++;
743 }
744 plist = plist->next;
745 offset = 0;
746 }
747 up_read(&card->controls_rwsem);
748 if (list.used > 0 &&
749 copy_to_user(list.pids, dst,
750 list.used * sizeof(struct snd_ctl_elem_id))) {
751 vfree(dst);
752 return -EFAULT;
753 }
754 vfree(dst);
755 } else {
756 down_read(&card->controls_rwsem);
757 list.count = card->controls_count;
758 up_read(&card->controls_rwsem);
759 }
760 if (copy_to_user(_list, &list, sizeof(list)))
761 return -EFAULT;
762 return 0;
763 }
764
765 static int snd_ctl_elem_info(struct snd_ctl_file *ctl,
766 struct snd_ctl_elem_info *info)
767 {
768 struct snd_card *card = ctl->card;
769 struct snd_kcontrol *kctl;
770 struct snd_kcontrol_volatile *vd;
771 unsigned int index_offset;
772 int result;
773
774 down_read(&card->controls_rwsem);
775 kctl = snd_ctl_find_id(card, &info->id);
776 if (kctl == NULL) {
777 up_read(&card->controls_rwsem);
778 return -ENOENT;
779 }
780 #ifdef CONFIG_SND_DEBUG
781 info->access = 0;
782 #endif
783 result = kctl->info(kctl, info);
784 if (result >= 0) {
785 snd_BUG_ON(info->access);
786 index_offset = snd_ctl_get_ioff(kctl, &info->id);
787 vd = &kctl->vd[index_offset];
788 snd_ctl_build_ioff(&info->id, kctl, index_offset);
789 info->access = vd->access;
790 if (vd->owner) {
791 info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK;
792 if (vd->owner == ctl)
793 info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER;
794 info->owner = pid_vnr(vd->owner->pid);
795 } else {
796 info->owner = -1;
797 }
798 }
799 up_read(&card->controls_rwsem);
800 return result;
801 }
802
803 static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,
804 struct snd_ctl_elem_info __user *_info)
805 {
806 struct snd_ctl_elem_info info;
807 int result;
808
809 if (copy_from_user(&info, _info, sizeof(info)))
810 return -EFAULT;
811 snd_power_lock(ctl->card);
812 result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
813 if (result >= 0)
814 result = snd_ctl_elem_info(ctl, &info);
815 snd_power_unlock(ctl->card);
816 if (result >= 0)
817 if (copy_to_user(_info, &info, sizeof(info)))
818 return -EFAULT;
819 return result;
820 }
821
822 static int snd_ctl_elem_read(struct snd_card *card,
823 struct snd_ctl_elem_value *control)
824 {
825 struct snd_kcontrol *kctl;
826 struct snd_kcontrol_volatile *vd;
827 unsigned int index_offset;
828 int result;
829
830 down_read(&card->controls_rwsem);
831 kctl = snd_ctl_find_id(card, &control->id);
832 if (kctl == NULL) {
833 result = -ENOENT;
834 } else {
835 index_offset = snd_ctl_get_ioff(kctl, &control->id);
836 vd = &kctl->vd[index_offset];
837 if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) &&
838 kctl->get != NULL) {
839 snd_ctl_build_ioff(&control->id, kctl, index_offset);
840 result = kctl->get(kctl, control);
841 } else
842 result = -EPERM;
843 }
844 up_read(&card->controls_rwsem);
845 return result;
846 }
847
848 static int snd_ctl_elem_read_user(struct snd_card *card,
849 struct snd_ctl_elem_value __user *_control)
850 {
851 struct snd_ctl_elem_value *control;
852 int result;
853
854 control = memdup_user(_control, sizeof(*control));
855 if (IS_ERR(control))
856 return PTR_ERR(control);
857
858 snd_power_lock(card);
859 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
860 if (result >= 0)
861 result = snd_ctl_elem_read(card, control);
862 snd_power_unlock(card);
863 if (result >= 0)
864 if (copy_to_user(_control, control, sizeof(*control)))
865 result = -EFAULT;
866 kfree(control);
867 return result;
868 }
869
870 static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file,
871 struct snd_ctl_elem_value *control)
872 {
873 struct snd_kcontrol *kctl;
874 struct snd_kcontrol_volatile *vd;
875 unsigned int index_offset;
876 int result;
877
878 down_read(&card->controls_rwsem);
879 kctl = snd_ctl_find_id(card, &control->id);
880 if (kctl == NULL) {
881 result = -ENOENT;
882 } else {
883 index_offset = snd_ctl_get_ioff(kctl, &control->id);
884 vd = &kctl->vd[index_offset];
885 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) ||
886 kctl->put == NULL ||
887 (file && vd->owner && vd->owner != file)) {
888 result = -EPERM;
889 } else {
890 snd_ctl_build_ioff(&control->id, kctl, index_offset);
891 result = kctl->put(kctl, control);
892 }
893 if (result > 0) {
894 up_read(&card->controls_rwsem);
895 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
896 &control->id);
897 return 0;
898 }
899 }
900 up_read(&card->controls_rwsem);
901 return result;
902 }
903
904 static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
905 struct snd_ctl_elem_value __user *_control)
906 {
907 struct snd_ctl_elem_value *control;
908 struct snd_card *card;
909 int result;
910
911 control = memdup_user(_control, sizeof(*control));
912 if (IS_ERR(control))
913 return PTR_ERR(control);
914
915 card = file->card;
916 snd_power_lock(card);
917 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
918 if (result >= 0)
919 result = snd_ctl_elem_write(card, file, control);
920 snd_power_unlock(card);
921 if (result >= 0)
922 if (copy_to_user(_control, control, sizeof(*control)))
923 result = -EFAULT;
924 kfree(control);
925 return result;
926 }
927
928 static int snd_ctl_elem_lock(struct snd_ctl_file *file,
929 struct snd_ctl_elem_id __user *_id)
930 {
931 struct snd_card *card = file->card;
932 struct snd_ctl_elem_id id;
933 struct snd_kcontrol *kctl;
934 struct snd_kcontrol_volatile *vd;
935 int result;
936
937 if (copy_from_user(&id, _id, sizeof(id)))
938 return -EFAULT;
939 down_write(&card->controls_rwsem);
940 kctl = snd_ctl_find_id(card, &id);
941 if (kctl == NULL) {
942 result = -ENOENT;
943 } else {
944 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
945 if (vd->owner != NULL)
946 result = -EBUSY;
947 else {
948 vd->owner = file;
949 result = 0;
950 }
951 }
952 up_write(&card->controls_rwsem);
953 return result;
954 }
955
956 static int snd_ctl_elem_unlock(struct snd_ctl_file *file,
957 struct snd_ctl_elem_id __user *_id)
958 {
959 struct snd_card *card = file->card;
960 struct snd_ctl_elem_id id;
961 struct snd_kcontrol *kctl;
962 struct snd_kcontrol_volatile *vd;
963 int result;
964
965 if (copy_from_user(&id, _id, sizeof(id)))
966 return -EFAULT;
967 down_write(&card->controls_rwsem);
968 kctl = snd_ctl_find_id(card, &id);
969 if (kctl == NULL) {
970 result = -ENOENT;
971 } else {
972 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
973 if (vd->owner == NULL)
974 result = -EINVAL;
975 else if (vd->owner != file)
976 result = -EPERM;
977 else {
978 vd->owner = NULL;
979 result = 0;
980 }
981 }
982 up_write(&card->controls_rwsem);
983 return result;
984 }
985
986 struct user_element {
987 struct snd_ctl_elem_info info;
988 void *elem_data; /* element data */
989 unsigned long elem_data_size; /* size of element data in bytes */
990 void *tlv_data; /* TLV data */
991 unsigned long tlv_data_size; /* TLV data size */
992 void *priv_data; /* private data (like strings for enumerated type) */
993 unsigned long priv_data_size; /* size of private data in bytes */
994 };
995
996 static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol,
997 struct snd_ctl_elem_info *uinfo)
998 {
999 struct user_element *ue = kcontrol->private_data;
1000
1001 *uinfo = ue->info;
1002 return 0;
1003 }
1004
1005 static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol,
1006 struct snd_ctl_elem_value *ucontrol)
1007 {
1008 struct user_element *ue = kcontrol->private_data;
1009
1010 memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size);
1011 return 0;
1012 }
1013
1014 static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol,
1015 struct snd_ctl_elem_value *ucontrol)
1016 {
1017 int change;
1018 struct user_element *ue = kcontrol->private_data;
1019
1020 change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0;
1021 if (change)
1022 memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size);
1023 return change;
1024 }
1025
1026 static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol,
1027 int op_flag,
1028 unsigned int size,
1029 unsigned int __user *tlv)
1030 {
1031 struct user_element *ue = kcontrol->private_data;
1032 int change = 0;
1033 void *new_data;
1034
1035 if (op_flag > 0) {
1036 if (size > 1024 * 128) /* sane value */
1037 return -EINVAL;
1038
1039 new_data = memdup_user(tlv, size);
1040 if (IS_ERR(new_data))
1041 return PTR_ERR(new_data);
1042 change = ue->tlv_data_size != size;
1043 if (!change)
1044 change = memcmp(ue->tlv_data, new_data, size);
1045 kfree(ue->tlv_data);
1046 ue->tlv_data = new_data;
1047 ue->tlv_data_size = size;
1048 } else {
1049 if (! ue->tlv_data_size || ! ue->tlv_data)
1050 return -ENXIO;
1051 if (size < ue->tlv_data_size)
1052 return -ENOSPC;
1053 if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size))
1054 return -EFAULT;
1055 }
1056 return change;
1057 }
1058
1059 static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol)
1060 {
1061 struct user_element *ue = kcontrol->private_data;
1062 if (ue->tlv_data)
1063 kfree(ue->tlv_data);
1064 kfree(ue);
1065 }
1066
1067 static int snd_ctl_elem_add(struct snd_ctl_file *file,
1068 struct snd_ctl_elem_info *info, int replace)
1069 {
1070 struct snd_card *card = file->card;
1071 struct snd_kcontrol kctl, *_kctl;
1072 unsigned int access;
1073 long private_size;
1074 struct user_element *ue;
1075 int idx, err;
1076
1077 if (!replace && card->user_ctl_count >= MAX_USER_CONTROLS)
1078 return -ENOMEM;
1079 if (info->count < 1)
1080 return -EINVAL;
1081 access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
1082 (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
1083 SNDRV_CTL_ELEM_ACCESS_INACTIVE|
1084 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE));
1085 info->id.numid = 0;
1086 memset(&kctl, 0, sizeof(kctl));
1087 down_write(&card->controls_rwsem);
1088 _kctl = snd_ctl_find_id(card, &info->id);
1089 err = 0;
1090 if (_kctl) {
1091 if (replace)
1092 err = snd_ctl_remove(card, _kctl);
1093 else
1094 err = -EBUSY;
1095 } else {
1096 if (replace)
1097 err = -ENOENT;
1098 }
1099 up_write(&card->controls_rwsem);
1100 if (err < 0)
1101 return err;
1102 memcpy(&kctl.id, &info->id, sizeof(info->id));
1103 kctl.count = info->owner ? info->owner : 1;
1104 access |= SNDRV_CTL_ELEM_ACCESS_USER;
1105 kctl.info = snd_ctl_elem_user_info;
1106 if (access & SNDRV_CTL_ELEM_ACCESS_READ)
1107 kctl.get = snd_ctl_elem_user_get;
1108 if (access & SNDRV_CTL_ELEM_ACCESS_WRITE)
1109 kctl.put = snd_ctl_elem_user_put;
1110 if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) {
1111 kctl.tlv.c = snd_ctl_elem_user_tlv;
1112 access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1113 }
1114 switch (info->type) {
1115 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
1116 case SNDRV_CTL_ELEM_TYPE_INTEGER:
1117 private_size = sizeof(long);
1118 if (info->count > 128)
1119 return -EINVAL;
1120 break;
1121 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
1122 private_size = sizeof(long long);
1123 if (info->count > 64)
1124 return -EINVAL;
1125 break;
1126 case SNDRV_CTL_ELEM_TYPE_BYTES:
1127 private_size = sizeof(unsigned char);
1128 if (info->count > 512)
1129 return -EINVAL;
1130 break;
1131 case SNDRV_CTL_ELEM_TYPE_IEC958:
1132 private_size = sizeof(struct snd_aes_iec958);
1133 if (info->count != 1)
1134 return -EINVAL;
1135 break;
1136 default:
1137 return -EINVAL;
1138 }
1139 private_size *= info->count;
1140 ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL);
1141 if (ue == NULL)
1142 return -ENOMEM;
1143 ue->info = *info;
1144 ue->info.access = 0;
1145 ue->elem_data = (char *)ue + sizeof(*ue);
1146 ue->elem_data_size = private_size;
1147 kctl.private_free = snd_ctl_elem_user_free;
1148 _kctl = snd_ctl_new(&kctl, access);
1149 if (_kctl == NULL) {
1150 kfree(ue);
1151 return -ENOMEM;
1152 }
1153 _kctl->private_data = ue;
1154 for (idx = 0; idx < _kctl->count; idx++)
1155 _kctl->vd[idx].owner = file;
1156 err = snd_ctl_add(card, _kctl);
1157 if (err < 0)
1158 return err;
1159
1160 down_write(&card->controls_rwsem);
1161 card->user_ctl_count++;
1162 up_write(&card->controls_rwsem);
1163
1164 return 0;
1165 }
1166
1167 static int snd_ctl_elem_add_user(struct snd_ctl_file *file,
1168 struct snd_ctl_elem_info __user *_info, int replace)
1169 {
1170 struct snd_ctl_elem_info info;
1171 if (copy_from_user(&info, _info, sizeof(info)))
1172 return -EFAULT;
1173 return snd_ctl_elem_add(file, &info, replace);
1174 }
1175
1176 static int snd_ctl_elem_remove(struct snd_ctl_file *file,
1177 struct snd_ctl_elem_id __user *_id)
1178 {
1179 struct snd_ctl_elem_id id;
1180
1181 if (copy_from_user(&id, _id, sizeof(id)))
1182 return -EFAULT;
1183 return snd_ctl_remove_user_ctl(file, &id);
1184 }
1185
1186 static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr)
1187 {
1188 int subscribe;
1189 if (get_user(subscribe, ptr))
1190 return -EFAULT;
1191 if (subscribe < 0) {
1192 subscribe = file->subscribed;
1193 if (put_user(subscribe, ptr))
1194 return -EFAULT;
1195 return 0;
1196 }
1197 if (subscribe) {
1198 file->subscribed = 1;
1199 return 0;
1200 } else if (file->subscribed) {
1201 snd_ctl_empty_read_queue(file);
1202 file->subscribed = 0;
1203 }
1204 return 0;
1205 }
1206
1207 static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file,
1208 struct snd_ctl_tlv __user *_tlv,
1209 int op_flag)
1210 {
1211 struct snd_card *card = file->card;
1212 struct snd_ctl_tlv tlv;
1213 struct snd_kcontrol *kctl;
1214 struct snd_kcontrol_volatile *vd;
1215 unsigned int len;
1216 int err = 0;
1217
1218 if (copy_from_user(&tlv, _tlv, sizeof(tlv)))
1219 return -EFAULT;
1220 if (tlv.length < sizeof(unsigned int) * 2)
1221 return -EINVAL;
1222 down_read(&card->controls_rwsem);
1223 kctl = snd_ctl_find_numid(card, tlv.numid);
1224 if (kctl == NULL) {
1225 err = -ENOENT;
1226 goto __kctl_end;
1227 }
1228 if (kctl->tlv.p == NULL) {
1229 err = -ENXIO;
1230 goto __kctl_end;
1231 }
1232 vd = &kctl->vd[tlv.numid - kctl->id.numid];
1233 if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) ||
1234 (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) ||
1235 (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) {
1236 err = -ENXIO;
1237 goto __kctl_end;
1238 }
1239 if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) {
1240 if (vd->owner != NULL && vd->owner != file) {
1241 err = -EPERM;
1242 goto __kctl_end;
1243 }
1244 err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv);
1245 if (err > 0) {
1246 up_read(&card->controls_rwsem);
1247 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id);
1248 return 0;
1249 }
1250 } else {
1251 if (op_flag) {
1252 err = -ENXIO;
1253 goto __kctl_end;
1254 }
1255 len = kctl->tlv.p[1] + 2 * sizeof(unsigned int);
1256 if (tlv.length < len) {
1257 err = -ENOMEM;
1258 goto __kctl_end;
1259 }
1260 if (copy_to_user(_tlv->tlv, kctl->tlv.p, len))
1261 err = -EFAULT;
1262 }
1263 __kctl_end:
1264 up_read(&card->controls_rwsem);
1265 return err;
1266 }
1267
1268 static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1269 {
1270 struct snd_ctl_file *ctl;
1271 struct snd_card *card;
1272 struct snd_kctl_ioctl *p;
1273 void __user *argp = (void __user *)arg;
1274 int __user *ip = argp;
1275 int err;
1276
1277 ctl = file->private_data;
1278 card = ctl->card;
1279 if (snd_BUG_ON(!card))
1280 return -ENXIO;
1281 switch (cmd) {
1282 case SNDRV_CTL_IOCTL_PVERSION:
1283 return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0;
1284 case SNDRV_CTL_IOCTL_CARD_INFO:
1285 return snd_ctl_card_info(card, ctl, cmd, argp);
1286 case SNDRV_CTL_IOCTL_ELEM_LIST:
1287 return snd_ctl_elem_list(card, argp);
1288 case SNDRV_CTL_IOCTL_ELEM_INFO:
1289 return snd_ctl_elem_info_user(ctl, argp);
1290 case SNDRV_CTL_IOCTL_ELEM_READ:
1291 return snd_ctl_elem_read_user(card, argp);
1292 case SNDRV_CTL_IOCTL_ELEM_WRITE:
1293 return snd_ctl_elem_write_user(ctl, argp);
1294 case SNDRV_CTL_IOCTL_ELEM_LOCK:
1295 return snd_ctl_elem_lock(ctl, argp);
1296 case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
1297 return snd_ctl_elem_unlock(ctl, argp);
1298 case SNDRV_CTL_IOCTL_ELEM_ADD:
1299 return snd_ctl_elem_add_user(ctl, argp, 0);
1300 case SNDRV_CTL_IOCTL_ELEM_REPLACE:
1301 return snd_ctl_elem_add_user(ctl, argp, 1);
1302 case SNDRV_CTL_IOCTL_ELEM_REMOVE:
1303 return snd_ctl_elem_remove(ctl, argp);
1304 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
1305 return snd_ctl_subscribe_events(ctl, ip);
1306 case SNDRV_CTL_IOCTL_TLV_READ:
1307 return snd_ctl_tlv_ioctl(ctl, argp, 0);
1308 case SNDRV_CTL_IOCTL_TLV_WRITE:
1309 return snd_ctl_tlv_ioctl(ctl, argp, 1);
1310 case SNDRV_CTL_IOCTL_TLV_COMMAND:
1311 return snd_ctl_tlv_ioctl(ctl, argp, -1);
1312 case SNDRV_CTL_IOCTL_POWER:
1313 return -ENOPROTOOPT;
1314 case SNDRV_CTL_IOCTL_POWER_STATE:
1315 #ifdef CONFIG_PM
1316 return put_user(card->power_state, ip) ? -EFAULT : 0;
1317 #else
1318 return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0;
1319 #endif
1320 }
1321 down_read(&snd_ioctl_rwsem);
1322 list_for_each_entry(p, &snd_control_ioctls, list) {
1323 err = p->fioctl(card, ctl, cmd, arg);
1324 if (err != -ENOIOCTLCMD) {
1325 up_read(&snd_ioctl_rwsem);
1326 return err;
1327 }
1328 }
1329 up_read(&snd_ioctl_rwsem);
1330 snd_printdd("unknown ioctl = 0x%x\n", cmd);
1331 return -ENOTTY;
1332 }
1333
1334 static ssize_t snd_ctl_read(struct file *file, char __user *buffer,
1335 size_t count, loff_t * offset)
1336 {
1337 struct snd_ctl_file *ctl;
1338 int err = 0;
1339 ssize_t result = 0;
1340
1341 ctl = file->private_data;
1342 if (snd_BUG_ON(!ctl || !ctl->card))
1343 return -ENXIO;
1344 if (!ctl->subscribed)
1345 return -EBADFD;
1346 if (count < sizeof(struct snd_ctl_event))
1347 return -EINVAL;
1348 spin_lock_irq(&ctl->read_lock);
1349 while (count >= sizeof(struct snd_ctl_event)) {
1350 struct snd_ctl_event ev;
1351 struct snd_kctl_event *kev;
1352 while (list_empty(&ctl->events)) {
1353 wait_queue_t wait;
1354 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1355 err = -EAGAIN;
1356 goto __end_lock;
1357 }
1358 init_waitqueue_entry(&wait, current);
1359 add_wait_queue(&ctl->change_sleep, &wait);
1360 set_current_state(TASK_INTERRUPTIBLE);
1361 spin_unlock_irq(&ctl->read_lock);
1362 schedule();
1363 remove_wait_queue(&ctl->change_sleep, &wait);
1364 if (signal_pending(current))
1365 return -ERESTARTSYS;
1366 spin_lock_irq(&ctl->read_lock);
1367 }
1368 kev = snd_kctl_event(ctl->events.next);
1369 ev.type = SNDRV_CTL_EVENT_ELEM;
1370 ev.data.elem.mask = kev->mask;
1371 ev.data.elem.id = kev->id;
1372 list_del(&kev->list);
1373 spin_unlock_irq(&ctl->read_lock);
1374 kfree(kev);
1375 if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) {
1376 err = -EFAULT;
1377 goto __end;
1378 }
1379 spin_lock_irq(&ctl->read_lock);
1380 buffer += sizeof(struct snd_ctl_event);
1381 count -= sizeof(struct snd_ctl_event);
1382 result += sizeof(struct snd_ctl_event);
1383 }
1384 __end_lock:
1385 spin_unlock_irq(&ctl->read_lock);
1386 __end:
1387 return result > 0 ? result : err;
1388 }
1389
1390 static unsigned int snd_ctl_poll(struct file *file, poll_table * wait)
1391 {
1392 unsigned int mask;
1393 struct snd_ctl_file *ctl;
1394
1395 ctl = file->private_data;
1396 if (!ctl->subscribed)
1397 return 0;
1398 poll_wait(file, &ctl->change_sleep, wait);
1399
1400 mask = 0;
1401 if (!list_empty(&ctl->events))
1402 mask |= POLLIN | POLLRDNORM;
1403
1404 return mask;
1405 }
1406
1407 /*
1408 * register the device-specific control-ioctls.
1409 * called from each device manager like pcm.c, hwdep.c, etc.
1410 */
1411 static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists)
1412 {
1413 struct snd_kctl_ioctl *pn;
1414
1415 pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL);
1416 if (pn == NULL)
1417 return -ENOMEM;
1418 pn->fioctl = fcn;
1419 down_write(&snd_ioctl_rwsem);
1420 list_add_tail(&pn->list, lists);
1421 up_write(&snd_ioctl_rwsem);
1422 return 0;
1423 }
1424
1425 int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn)
1426 {
1427 return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls);
1428 }
1429
1430 EXPORT_SYMBOL(snd_ctl_register_ioctl);
1431
1432 #ifdef CONFIG_COMPAT
1433 int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1434 {
1435 return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls);
1436 }
1437
1438 EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
1439 #endif
1440
1441 /*
1442 * de-register the device-specific control-ioctls.
1443 */
1444 static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn,
1445 struct list_head *lists)
1446 {
1447 struct snd_kctl_ioctl *p;
1448
1449 if (snd_BUG_ON(!fcn))
1450 return -EINVAL;
1451 down_write(&snd_ioctl_rwsem);
1452 list_for_each_entry(p, lists, list) {
1453 if (p->fioctl == fcn) {
1454 list_del(&p->list);
1455 up_write(&snd_ioctl_rwsem);
1456 kfree(p);
1457 return 0;
1458 }
1459 }
1460 up_write(&snd_ioctl_rwsem);
1461 snd_BUG();
1462 return -EINVAL;
1463 }
1464
1465 int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn)
1466 {
1467 return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls);
1468 }
1469
1470 EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
1471
1472 #ifdef CONFIG_COMPAT
1473 int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1474 {
1475 return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls);
1476 }
1477
1478 EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
1479 #endif
1480
1481 static int snd_ctl_fasync(int fd, struct file * file, int on)
1482 {
1483 struct snd_ctl_file *ctl;
1484
1485 ctl = file->private_data;
1486 return fasync_helper(fd, file, on, &ctl->fasync);
1487 }
1488
1489 /*
1490 * ioctl32 compat
1491 */
1492 #ifdef CONFIG_COMPAT
1493 #include "control_compat.c"
1494 #else
1495 #define snd_ctl_ioctl_compat NULL
1496 #endif
1497
1498 /*
1499 * INIT PART
1500 */
1501
1502 static const struct file_operations snd_ctl_f_ops =
1503 {
1504 .owner = THIS_MODULE,
1505 .read = snd_ctl_read,
1506 .open = snd_ctl_open,
1507 .release = snd_ctl_release,
1508 .llseek = no_llseek,
1509 .poll = snd_ctl_poll,
1510 .unlocked_ioctl = snd_ctl_ioctl,
1511 .compat_ioctl = snd_ctl_ioctl_compat,
1512 .fasync = snd_ctl_fasync,
1513 };
1514
1515 /*
1516 * registration of the control device
1517 */
1518 static int snd_ctl_dev_register(struct snd_device *device)
1519 {
1520 struct snd_card *card = device->device_data;
1521 int err, cardnum;
1522 char name[16];
1523
1524 if (snd_BUG_ON(!card))
1525 return -ENXIO;
1526 cardnum = card->number;
1527 if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1528 return -ENXIO;
1529 sprintf(name, "controlC%i", cardnum);
1530 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
1531 &snd_ctl_f_ops, card, name)) < 0)
1532 return err;
1533 return 0;
1534 }
1535
1536 /*
1537 * disconnection of the control device
1538 */
1539 static int snd_ctl_dev_disconnect(struct snd_device *device)
1540 {
1541 struct snd_card *card = device->device_data;
1542 struct snd_ctl_file *ctl;
1543 int err, cardnum;
1544
1545 if (snd_BUG_ON(!card))
1546 return -ENXIO;
1547 cardnum = card->number;
1548 if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1549 return -ENXIO;
1550
1551 read_lock(&card->ctl_files_rwlock);
1552 list_for_each_entry(ctl, &card->ctl_files, list) {
1553 wake_up(&ctl->change_sleep);
1554 kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);
1555 }
1556 read_unlock(&card->ctl_files_rwlock);
1557
1558 if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL,
1559 card, -1)) < 0)
1560 return err;
1561 return 0;
1562 }
1563
1564 /*
1565 * free all controls
1566 */
1567 static int snd_ctl_dev_free(struct snd_device *device)
1568 {
1569 struct snd_card *card = device->device_data;
1570 struct snd_kcontrol *control;
1571
1572 down_write(&card->controls_rwsem);
1573 while (!list_empty(&card->controls)) {
1574 control = snd_kcontrol(card->controls.next);
1575 snd_ctl_remove(card, control);
1576 }
1577 up_write(&card->controls_rwsem);
1578 return 0;
1579 }
1580
1581 /*
1582 * create control core:
1583 * called from init.c
1584 */
1585 int snd_ctl_create(struct snd_card *card)
1586 {
1587 static struct snd_device_ops ops = {
1588 .dev_free = snd_ctl_dev_free,
1589 .dev_register = snd_ctl_dev_register,
1590 .dev_disconnect = snd_ctl_dev_disconnect,
1591 };
1592
1593 if (snd_BUG_ON(!card))
1594 return -ENXIO;
1595 return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);
1596 }
1597
1598 /*
1599 * Frequently used control callbacks/helpers
1600 */
1601 int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
1602 struct snd_ctl_elem_info *uinfo)
1603 {
1604 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1605 uinfo->count = 1;
1606 uinfo->value.integer.min = 0;
1607 uinfo->value.integer.max = 1;
1608 return 0;
1609 }
1610
1611 EXPORT_SYMBOL(snd_ctl_boolean_mono_info);
1612
1613 int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
1614 struct snd_ctl_elem_info *uinfo)
1615 {
1616 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1617 uinfo->count = 2;
1618 uinfo->value.integer.min = 0;
1619 uinfo->value.integer.max = 1;
1620 return 0;
1621 }
1622
1623 EXPORT_SYMBOL(snd_ctl_boolean_stereo_info);
1624
1625 /**
1626 * snd_ctl_enum_info - fills the info structure for an enumerated control
1627 * @info: the structure to be filled
1628 * @channels: the number of the control's channels; often one
1629 * @items: the number of control values; also the size of @names
1630 * @names: an array containing the names of all control values
1631 *
1632 * Sets all required fields in @info to their appropriate values.
1633 * If the control's accessibility is not the default (readable and writable),
1634 * the caller has to fill @info->access.
1635 */
1636 int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels,
1637 unsigned int items, const char *const names[])
1638 {
1639 info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
1640 info->count = channels;
1641 info->value.enumerated.items = items;
1642 if (info->value.enumerated.item >= items)
1643 info->value.enumerated.item = items - 1;
1644 strlcpy(info->value.enumerated.name,
1645 names[info->value.enumerated.item],
1646 sizeof(info->value.enumerated.name));
1647 return 0;
1648 }
1649 EXPORT_SYMBOL(snd_ctl_enum_info);
linux-next