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writeback: split writeback_inodes_wb
[linux-2.6/next.git] / sound / core / control.c
blob070aab4901914870a0af43faef27e82e761acc32
1 /*
2 * Routines for driver control interface
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/threads.h>
23 #include <linux/interrupt.h>
24 #include <linux/slab.h>
25 #include <linux/vmalloc.h>
26 #include <linux/time.h>
27 #include <sound/core.h>
28 #include <sound/minors.h>
29 #include <sound/info.h>
30 #include <sound/control.h>
31
32 /* max number of user-defined controls */
33 #define MAX_USER_CONTROLS 32
34
35 struct snd_kctl_ioctl {
36 struct list_head list; /* list of all ioctls */
37 snd_kctl_ioctl_func_t fioctl;
38 };
39
40 static DECLARE_RWSEM(snd_ioctl_rwsem);
41 static LIST_HEAD(snd_control_ioctls);
42 #ifdef CONFIG_COMPAT
43 static LIST_HEAD(snd_control_compat_ioctls);
44 #endif
45
46 static int snd_ctl_open(struct inode *inode, struct file *file)
47 {
48 unsigned long flags;
49 struct snd_card *card;
50 struct snd_ctl_file *ctl;
51 int err;
52
53 err = nonseekable_open(inode, file);
54 if (err < 0)
55 return err;
56
57 card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL);
58 if (!card) {
59 err = -ENODEV;
60 goto __error1;
61 }
62 err = snd_card_file_add(card, file);
63 if (err < 0) {
64 err = -ENODEV;
65 goto __error1;
66 }
67 if (!try_module_get(card->module)) {
68 err = -EFAULT;
69 goto __error2;
70 }
71 ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
72 if (ctl == NULL) {
73 err = -ENOMEM;
74 goto __error;
75 }
76 INIT_LIST_HEAD(&ctl->events);
77 init_waitqueue_head(&ctl->change_sleep);
78 spin_lock_init(&ctl->read_lock);
79 ctl->card = card;
80 ctl->prefer_pcm_subdevice = -1;
81 ctl->prefer_rawmidi_subdevice = -1;
82 ctl->pid = get_pid(task_pid(current));
83 file->private_data = ctl;
84 write_lock_irqsave(&card->ctl_files_rwlock, flags);
85 list_add_tail(&ctl->list, &card->ctl_files);
86 write_unlock_irqrestore(&card->ctl_files_rwlock, flags);
87 return 0;
88
89 __error:
90 module_put(card->module);
91 __error2:
92 snd_card_file_remove(card, file);
93 __error1:
94 return err;
95 }
96
97 static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl)
98 {
99 unsigned long flags;
100 struct snd_kctl_event *cread;
101
102 spin_lock_irqsave(&ctl->read_lock, flags);
103 while (!list_empty(&ctl->events)) {
104 cread = snd_kctl_event(ctl->events.next);
105 list_del(&cread->list);
106 kfree(cread);
107 }
108 spin_unlock_irqrestore(&ctl->read_lock, flags);
109 }
110
111 static int snd_ctl_release(struct inode *inode, struct file *file)
112 {
113 unsigned long flags;
114 struct snd_card *card;
115 struct snd_ctl_file *ctl;
116 struct snd_kcontrol *control;
117 unsigned int idx;
118
119 ctl = file->private_data;
120 file->private_data = NULL;
121 card = ctl->card;
122 write_lock_irqsave(&card->ctl_files_rwlock, flags);
123 list_del(&ctl->list);
124 write_unlock_irqrestore(&card->ctl_files_rwlock, flags);
125 down_write(&card->controls_rwsem);
126 list_for_each_entry(control, &card->controls, list)
127 for (idx = 0; idx < control->count; idx++)
128 if (control->vd[idx].owner == ctl)
129 control->vd[idx].owner = NULL;
130 up_write(&card->controls_rwsem);
131 snd_ctl_empty_read_queue(ctl);
132 put_pid(ctl->pid);
133 kfree(ctl);
134 module_put(card->module);
135 snd_card_file_remove(card, file);
136 return 0;
137 }
138
139 void snd_ctl_notify(struct snd_card *card, unsigned int mask,
140 struct snd_ctl_elem_id *id)
141 {
142 unsigned long flags;
143 struct snd_ctl_file *ctl;
144 struct snd_kctl_event *ev;
145
146 if (snd_BUG_ON(!card || !id))
147 return;
148 read_lock(&card->ctl_files_rwlock);
149 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
150 card->mixer_oss_change_count++;
151 #endif
152 list_for_each_entry(ctl, &card->ctl_files, list) {
153 if (!ctl->subscribed)
154 continue;
155 spin_lock_irqsave(&ctl->read_lock, flags);
156 list_for_each_entry(ev, &ctl->events, list) {
157 if (ev->id.numid == id->numid) {
158 ev->mask |= mask;
159 goto _found;
160 }
161 }
162 ev = kzalloc(sizeof(*ev), GFP_ATOMIC);
163 if (ev) {
164 ev->id = *id;
165 ev->mask = mask;
166 list_add_tail(&ev->list, &ctl->events);
167 } else {
168 snd_printk(KERN_ERR "No memory available to allocate event\n");
169 }
170 _found:
171 wake_up(&ctl->change_sleep);
172 spin_unlock_irqrestore(&ctl->read_lock, flags);
173 kill_fasync(&ctl->fasync, SIGIO, POLL_IN);
174 }
175 read_unlock(&card->ctl_files_rwlock);
176 }
177
178 EXPORT_SYMBOL(snd_ctl_notify);
179
180 /**
181 * snd_ctl_new - create a control instance from the template
182 * @control: the control template
183 * @access: the default control access
184 *
185 * Allocates a new struct snd_kcontrol instance and copies the given template
186 * to the new instance. It does not copy volatile data (access).
187 *
188 * Returns the pointer of the new instance, or NULL on failure.
189 */
190 static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control,
191 unsigned int access)
192 {
193 struct snd_kcontrol *kctl;
194 unsigned int idx;
195
196 if (snd_BUG_ON(!control || !control->count))
197 return NULL;
198 kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL);
199 if (kctl == NULL) {
200 snd_printk(KERN_ERR "Cannot allocate control instance\n");
201 return NULL;
202 }
203 *kctl = *control;
204 for (idx = 0; idx < kctl->count; idx++)
205 kctl->vd[idx].access = access;
206 return kctl;
207 }
208
209 /**
210 * snd_ctl_new1 - create a control instance from the template
211 * @ncontrol: the initialization record
212 * @private_data: the private data to set
213 *
214 * Allocates a new struct snd_kcontrol instance and initialize from the given
215 * template. When the access field of ncontrol is 0, it's assumed as
216 * READWRITE access. When the count field is 0, it's assumes as one.
217 *
218 * Returns the pointer of the newly generated instance, or NULL on failure.
219 */
220 struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol,
221 void *private_data)
222 {
223 struct snd_kcontrol kctl;
224 unsigned int access;
225
226 if (snd_BUG_ON(!ncontrol || !ncontrol->info))
227 return NULL;
228 memset(&kctl, 0, sizeof(kctl));
229 kctl.id.iface = ncontrol->iface;
230 kctl.id.device = ncontrol->device;
231 kctl.id.subdevice = ncontrol->subdevice;
232 if (ncontrol->name) {
233 strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name));
234 if (strcmp(ncontrol->name, kctl.id.name) != 0)
235 snd_printk(KERN_WARNING
236 "Control name '%s' truncated to '%s'\n",
237 ncontrol->name, kctl.id.name);
238 }
239 kctl.id.index = ncontrol->index;
240 kctl.count = ncontrol->count ? ncontrol->count : 1;
241 access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
242 (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
243 SNDRV_CTL_ELEM_ACCESS_INACTIVE|
244 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE|
245 SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND|
246 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK));
247 kctl.info = ncontrol->info;
248 kctl.get = ncontrol->get;
249 kctl.put = ncontrol->put;
250 kctl.tlv.p = ncontrol->tlv.p;
251 kctl.private_value = ncontrol->private_value;
252 kctl.private_data = private_data;
253 return snd_ctl_new(&kctl, access);
254 }
255
256 EXPORT_SYMBOL(snd_ctl_new1);
257
258 /**
259 * snd_ctl_free_one - release the control instance
260 * @kcontrol: the control instance
261 *
262 * Releases the control instance created via snd_ctl_new()
263 * or snd_ctl_new1().
264 * Don't call this after the control was added to the card.
265 */
266 void snd_ctl_free_one(struct snd_kcontrol *kcontrol)
267 {
268 if (kcontrol) {
269 if (kcontrol->private_free)
270 kcontrol->private_free(kcontrol);
271 kfree(kcontrol);
272 }
273 }
274
275 EXPORT_SYMBOL(snd_ctl_free_one);
276
277 static unsigned int snd_ctl_hole_check(struct snd_card *card,
278 unsigned int count)
279 {
280 struct snd_kcontrol *kctl;
281
282 list_for_each_entry(kctl, &card->controls, list) {
283 if ((kctl->id.numid <= card->last_numid &&
284 kctl->id.numid + kctl->count > card->last_numid) ||
285 (kctl->id.numid <= card->last_numid + count - 1 &&
286 kctl->id.numid + kctl->count > card->last_numid + count - 1))
287 return card->last_numid = kctl->id.numid + kctl->count - 1;
288 }
289 return card->last_numid;
290 }
291
292 static int snd_ctl_find_hole(struct snd_card *card, unsigned int count)
293 {
294 unsigned int last_numid, iter = 100000;
295
296 last_numid = card->last_numid;
297 while (last_numid != snd_ctl_hole_check(card, count)) {
298 if (--iter == 0) {
299 /* this situation is very unlikely */
300 snd_printk(KERN_ERR "unable to allocate new control numid\n");
301 return -ENOMEM;
302 }
303 last_numid = card->last_numid;
304 }
305 return 0;
306 }
307
308 /**
309 * snd_ctl_add - add the control instance to the card
310 * @card: the card instance
311 * @kcontrol: the control instance to add
312 *
313 * Adds the control instance created via snd_ctl_new() or
314 * snd_ctl_new1() to the given card. Assigns also an unique
315 * numid used for fast search.
316 *
317 * Returns zero if successful, or a negative error code on failure.
318 *
319 * It frees automatically the control which cannot be added.
320 */
321 int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
322 {
323 struct snd_ctl_elem_id id;
324 unsigned int idx;
325 int err = -EINVAL;
326
327 if (! kcontrol)
328 return err;
329 if (snd_BUG_ON(!card || !kcontrol->info))
330 goto error;
331 id = kcontrol->id;
332 down_write(&card->controls_rwsem);
333 if (snd_ctl_find_id(card, &id)) {
334 up_write(&card->controls_rwsem);
335 snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n",
336 id.iface,
337 id.device,
338 id.subdevice,
339 id.name,
340 id.index);
341 err = -EBUSY;
342 goto error;
343 }
344 if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
345 up_write(&card->controls_rwsem);
346 err = -ENOMEM;
347 goto error;
348 }
349 list_add_tail(&kcontrol->list, &card->controls);
350 card->controls_count += kcontrol->count;
351 kcontrol->id.numid = card->last_numid + 1;
352 card->last_numid += kcontrol->count;
353 up_write(&card->controls_rwsem);
354 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
355 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
356 return 0;
357
358 error:
359 snd_ctl_free_one(kcontrol);
360 return err;
361 }
362
363 EXPORT_SYMBOL(snd_ctl_add);
364
365 /**
366 * snd_ctl_remove - remove the control from the card and release it
367 * @card: the card instance
368 * @kcontrol: the control instance to remove
369 *
370 * Removes the control from the card and then releases the instance.
371 * You don't need to call snd_ctl_free_one(). You must be in
372 * the write lock - down_write(&card->controls_rwsem).
373 *
374 * Returns 0 if successful, or a negative error code on failure.
375 */
376 int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol)
377 {
378 struct snd_ctl_elem_id id;
379 unsigned int idx;
380
381 if (snd_BUG_ON(!card || !kcontrol))
382 return -EINVAL;
383 list_del(&kcontrol->list);
384 card->controls_count -= kcontrol->count;
385 id = kcontrol->id;
386 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
387 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id);
388 snd_ctl_free_one(kcontrol);
389 return 0;
390 }
391
392 EXPORT_SYMBOL(snd_ctl_remove);
393
394 /**
395 * snd_ctl_remove_id - remove the control of the given id and release it
396 * @card: the card instance
397 * @id: the control id to remove
398 *
399 * Finds the control instance with the given id, removes it from the
400 * card list and releases it.
401 *
402 * Returns 0 if successful, or a negative error code on failure.
403 */
404 int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id)
405 {
406 struct snd_kcontrol *kctl;
407 int ret;
408
409 down_write(&card->controls_rwsem);
410 kctl = snd_ctl_find_id(card, id);
411 if (kctl == NULL) {
412 up_write(&card->controls_rwsem);
413 return -ENOENT;
414 }
415 ret = snd_ctl_remove(card, kctl);
416 up_write(&card->controls_rwsem);
417 return ret;
418 }
419
420 EXPORT_SYMBOL(snd_ctl_remove_id);
421
422 /**
423 * snd_ctl_remove_user_ctl - remove and release the unlocked user control
424 * @file: active control handle
425 * @id: the control id to remove
426 *
427 * Finds the control instance with the given id, removes it from the
428 * card list and releases it.
429 *
430 * Returns 0 if successful, or a negative error code on failure.
431 */
432 static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file,
433 struct snd_ctl_elem_id *id)
434 {
435 struct snd_card *card = file->card;
436 struct snd_kcontrol *kctl;
437 int idx, ret;
438
439 down_write(&card->controls_rwsem);
440 kctl = snd_ctl_find_id(card, id);
441 if (kctl == NULL) {
442 ret = -ENOENT;
443 goto error;
444 }
445 if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) {
446 ret = -EINVAL;
447 goto error;
448 }
449 for (idx = 0; idx < kctl->count; idx++)
450 if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {
451 ret = -EBUSY;
452 goto error;
453 }
454 ret = snd_ctl_remove(card, kctl);
455 if (ret < 0)
456 goto error;
457 card->user_ctl_count--;
458 error:
459 up_write(&card->controls_rwsem);
460 return ret;
461 }
462
463 /**
464 * snd_ctl_rename_id - replace the id of a control on the card
465 * @card: the card instance
466 * @src_id: the old id
467 * @dst_id: the new id
468 *
469 * Finds the control with the old id from the card, and replaces the
470 * id with the new one.
471 *
472 * Returns zero if successful, or a negative error code on failure.
473 */
474 int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id,
475 struct snd_ctl_elem_id *dst_id)
476 {
477 struct snd_kcontrol *kctl;
478
479 down_write(&card->controls_rwsem);
480 kctl = snd_ctl_find_id(card, src_id);
481 if (kctl == NULL) {
482 up_write(&card->controls_rwsem);
483 return -ENOENT;
484 }
485 kctl->id = *dst_id;
486 kctl->id.numid = card->last_numid + 1;
487 card->last_numid += kctl->count;
488 up_write(&card->controls_rwsem);
489 return 0;
490 }
491
492 EXPORT_SYMBOL(snd_ctl_rename_id);
493
494 /**
495 * snd_ctl_find_numid - find the control instance with the given number-id
496 * @card: the card instance
497 * @numid: the number-id to search
498 *
499 * Finds the control instance with the given number-id from the card.
500 *
501 * Returns the pointer of the instance if found, or NULL if not.
502 *
503 * The caller must down card->controls_rwsem before calling this function
504 * (if the race condition can happen).
505 */
506 struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid)
507 {
508 struct snd_kcontrol *kctl;
509
510 if (snd_BUG_ON(!card || !numid))
511 return NULL;
512 list_for_each_entry(kctl, &card->controls, list) {
513 if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid)
514 return kctl;
515 }
516 return NULL;
517 }
518
519 EXPORT_SYMBOL(snd_ctl_find_numid);
520
521 /**
522 * snd_ctl_find_id - find the control instance with the given id
523 * @card: the card instance
524 * @id: the id to search
525 *
526 * Finds the control instance with the given id from the card.
527 *
528 * Returns the pointer of the instance if found, or NULL if not.
529 *
530 * The caller must down card->controls_rwsem before calling this function
531 * (if the race condition can happen).
532 */
533 struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card,
534 struct snd_ctl_elem_id *id)
535 {
536 struct snd_kcontrol *kctl;
537
538 if (snd_BUG_ON(!card || !id))
539 return NULL;
540 if (id->numid != 0)
541 return snd_ctl_find_numid(card, id->numid);
542 list_for_each_entry(kctl, &card->controls, list) {
543 if (kctl->id.iface != id->iface)
544 continue;
545 if (kctl->id.device != id->device)
546 continue;
547 if (kctl->id.subdevice != id->subdevice)
548 continue;
549 if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name)))
550 continue;
551 if (kctl->id.index > id->index)
552 continue;
553 if (kctl->id.index + kctl->count <= id->index)
554 continue;
555 return kctl;
556 }
557 return NULL;
558 }
559
560 EXPORT_SYMBOL(snd_ctl_find_id);
561
562 static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,
563 unsigned int cmd, void __user *arg)
564 {
565 struct snd_ctl_card_info *info;
566
567 info = kzalloc(sizeof(*info), GFP_KERNEL);
568 if (! info)
569 return -ENOMEM;
570 down_read(&snd_ioctl_rwsem);
571 info->card = card->number;
572 strlcpy(info->id, card->id, sizeof(info->id));
573 strlcpy(info->driver, card->driver, sizeof(info->driver));
574 strlcpy(info->name, card->shortname, sizeof(info->name));
575 strlcpy(info->longname, card->longname, sizeof(info->longname));
576 strlcpy(info->mixername, card->mixername, sizeof(info->mixername));
577 strlcpy(info->components, card->components, sizeof(info->components));
578 up_read(&snd_ioctl_rwsem);
579 if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) {
580 kfree(info);
581 return -EFAULT;
582 }
583 kfree(info);
584 return 0;
585 }
586
587 static int snd_ctl_elem_list(struct snd_card *card,
588 struct snd_ctl_elem_list __user *_list)
589 {
590 struct list_head *plist;
591 struct snd_ctl_elem_list list;
592 struct snd_kcontrol *kctl;
593 struct snd_ctl_elem_id *dst, *id;
594 unsigned int offset, space, first, jidx;
595
596 if (copy_from_user(&list, _list, sizeof(list)))
597 return -EFAULT;
598 offset = list.offset;
599 space = list.space;
600 first = 0;
601 /* try limit maximum space */
602 if (space > 16384)
603 return -ENOMEM;
604 if (space > 0) {
605 /* allocate temporary buffer for atomic operation */
606 dst = vmalloc(space * sizeof(struct snd_ctl_elem_id));
607 if (dst == NULL)
608 return -ENOMEM;
609 down_read(&card->controls_rwsem);
610 list.count = card->controls_count;
611 plist = card->controls.next;
612 while (plist != &card->controls) {
613 if (offset == 0)
614 break;
615 kctl = snd_kcontrol(plist);
616 if (offset < kctl->count)
617 break;
618 offset -= kctl->count;
619 plist = plist->next;
620 }
621 list.used = 0;
622 id = dst;
623 while (space > 0 && plist != &card->controls) {
624 kctl = snd_kcontrol(plist);
625 for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) {
626 snd_ctl_build_ioff(id, kctl, jidx);
627 id++;
628 space--;
629 list.used++;
630 }
631 plist = plist->next;
632 offset = 0;
633 }
634 up_read(&card->controls_rwsem);
635 if (list.used > 0 &&
636 copy_to_user(list.pids, dst,
637 list.used * sizeof(struct snd_ctl_elem_id))) {
638 vfree(dst);
639 return -EFAULT;
640 }
641 vfree(dst);
642 } else {
643 down_read(&card->controls_rwsem);
644 list.count = card->controls_count;
645 up_read(&card->controls_rwsem);
646 }
647 if (copy_to_user(_list, &list, sizeof(list)))
648 return -EFAULT;
649 return 0;
650 }
651
652 static int snd_ctl_elem_info(struct snd_ctl_file *ctl,
653 struct snd_ctl_elem_info *info)
654 {
655 struct snd_card *card = ctl->card;
656 struct snd_kcontrol *kctl;
657 struct snd_kcontrol_volatile *vd;
658 unsigned int index_offset;
659 int result;
660
661 down_read(&card->controls_rwsem);
662 kctl = snd_ctl_find_id(card, &info->id);
663 if (kctl == NULL) {
664 up_read(&card->controls_rwsem);
665 return -ENOENT;
666 }
667 #ifdef CONFIG_SND_DEBUG
668 info->access = 0;
669 #endif
670 result = kctl->info(kctl, info);
671 if (result >= 0) {
672 snd_BUG_ON(info->access);
673 index_offset = snd_ctl_get_ioff(kctl, &info->id);
674 vd = &kctl->vd[index_offset];
675 snd_ctl_build_ioff(&info->id, kctl, index_offset);
676 info->access = vd->access;
677 if (vd->owner) {
678 info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK;
679 if (vd->owner == ctl)
680 info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER;
681 info->owner = pid_vnr(vd->owner->pid);
682 } else {
683 info->owner = -1;
684 }
685 }
686 up_read(&card->controls_rwsem);
687 return result;
688 }
689
690 static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,
691 struct snd_ctl_elem_info __user *_info)
692 {
693 struct snd_ctl_elem_info info;
694 int result;
695
696 if (copy_from_user(&info, _info, sizeof(info)))
697 return -EFAULT;
698 snd_power_lock(ctl->card);
699 result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
700 if (result >= 0)
701 result = snd_ctl_elem_info(ctl, &info);
702 snd_power_unlock(ctl->card);
703 if (result >= 0)
704 if (copy_to_user(_info, &info, sizeof(info)))
705 return -EFAULT;
706 return result;
707 }
708
709 static int snd_ctl_elem_read(struct snd_card *card,
710 struct snd_ctl_elem_value *control)
711 {
712 struct snd_kcontrol *kctl;
713 struct snd_kcontrol_volatile *vd;
714 unsigned int index_offset;
715 int result;
716
717 down_read(&card->controls_rwsem);
718 kctl = snd_ctl_find_id(card, &control->id);
719 if (kctl == NULL) {
720 result = -ENOENT;
721 } else {
722 index_offset = snd_ctl_get_ioff(kctl, &control->id);
723 vd = &kctl->vd[index_offset];
724 if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) &&
725 kctl->get != NULL) {
726 snd_ctl_build_ioff(&control->id, kctl, index_offset);
727 result = kctl->get(kctl, control);
728 } else
729 result = -EPERM;
730 }
731 up_read(&card->controls_rwsem);
732 return result;
733 }
734
735 static int snd_ctl_elem_read_user(struct snd_card *card,
736 struct snd_ctl_elem_value __user *_control)
737 {
738 struct snd_ctl_elem_value *control;
739 int result;
740
741 control = memdup_user(_control, sizeof(*control));
742 if (IS_ERR(control))
743 return PTR_ERR(control);
744
745 snd_power_lock(card);
746 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
747 if (result >= 0)
748 result = snd_ctl_elem_read(card, control);
749 snd_power_unlock(card);
750 if (result >= 0)
751 if (copy_to_user(_control, control, sizeof(*control)))
752 result = -EFAULT;
753 kfree(control);
754 return result;
755 }
756
757 static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file,
758 struct snd_ctl_elem_value *control)
759 {
760 struct snd_kcontrol *kctl;
761 struct snd_kcontrol_volatile *vd;
762 unsigned int index_offset;
763 int result;
764
765 down_read(&card->controls_rwsem);
766 kctl = snd_ctl_find_id(card, &control->id);
767 if (kctl == NULL) {
768 result = -ENOENT;
769 } else {
770 index_offset = snd_ctl_get_ioff(kctl, &control->id);
771 vd = &kctl->vd[index_offset];
772 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) ||
773 kctl->put == NULL ||
774 (file && vd->owner && vd->owner != file)) {
775 result = -EPERM;
776 } else {
777 snd_ctl_build_ioff(&control->id, kctl, index_offset);
778 result = kctl->put(kctl, control);
779 }
780 if (result > 0) {
781 up_read(&card->controls_rwsem);
782 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
783 &control->id);
784 return 0;
785 }
786 }
787 up_read(&card->controls_rwsem);
788 return result;
789 }
790
791 static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
792 struct snd_ctl_elem_value __user *_control)
793 {
794 struct snd_ctl_elem_value *control;
795 struct snd_card *card;
796 int result;
797
798 control = memdup_user(_control, sizeof(*control));
799 if (IS_ERR(control))
800 return PTR_ERR(control);
801
802 card = file->card;
803 snd_power_lock(card);
804 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
805 if (result >= 0)
806 result = snd_ctl_elem_write(card, file, control);
807 snd_power_unlock(card);
808 if (result >= 0)
809 if (copy_to_user(_control, control, sizeof(*control)))
810 result = -EFAULT;
811 kfree(control);
812 return result;
813 }
814
815 static int snd_ctl_elem_lock(struct snd_ctl_file *file,
816 struct snd_ctl_elem_id __user *_id)
817 {
818 struct snd_card *card = file->card;
819 struct snd_ctl_elem_id id;
820 struct snd_kcontrol *kctl;
821 struct snd_kcontrol_volatile *vd;
822 int result;
823
824 if (copy_from_user(&id, _id, sizeof(id)))
825 return -EFAULT;
826 down_write(&card->controls_rwsem);
827 kctl = snd_ctl_find_id(card, &id);
828 if (kctl == NULL) {
829 result = -ENOENT;
830 } else {
831 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
832 if (vd->owner != NULL)
833 result = -EBUSY;
834 else {
835 vd->owner = file;
836 result = 0;
837 }
838 }
839 up_write(&card->controls_rwsem);
840 return result;
841 }
842
843 static int snd_ctl_elem_unlock(struct snd_ctl_file *file,
844 struct snd_ctl_elem_id __user *_id)
845 {
846 struct snd_card *card = file->card;
847 struct snd_ctl_elem_id id;
848 struct snd_kcontrol *kctl;
849 struct snd_kcontrol_volatile *vd;
850 int result;
851
852 if (copy_from_user(&id, _id, sizeof(id)))
853 return -EFAULT;
854 down_write(&card->controls_rwsem);
855 kctl = snd_ctl_find_id(card, &id);
856 if (kctl == NULL) {
857 result = -ENOENT;
858 } else {
859 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
860 if (vd->owner == NULL)
861 result = -EINVAL;
862 else if (vd->owner != file)
863 result = -EPERM;
864 else {
865 vd->owner = NULL;
866 result = 0;
867 }
868 }
869 up_write(&card->controls_rwsem);
870 return result;
871 }
872
873 struct user_element {
874 struct snd_ctl_elem_info info;
875 void *elem_data; /* element data */
876 unsigned long elem_data_size; /* size of element data in bytes */
877 void *tlv_data; /* TLV data */
878 unsigned long tlv_data_size; /* TLV data size */
879 void *priv_data; /* private data (like strings for enumerated type) */
880 unsigned long priv_data_size; /* size of private data in bytes */
881 };
882
883 static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol,
884 struct snd_ctl_elem_info *uinfo)
885 {
886 struct user_element *ue = kcontrol->private_data;
887
888 *uinfo = ue->info;
889 return 0;
890 }
891
892 static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol,
893 struct snd_ctl_elem_value *ucontrol)
894 {
895 struct user_element *ue = kcontrol->private_data;
896
897 memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size);
898 return 0;
899 }
900
901 static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol,
902 struct snd_ctl_elem_value *ucontrol)
903 {
904 int change;
905 struct user_element *ue = kcontrol->private_data;
906
907 change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0;
908 if (change)
909 memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size);
910 return change;
911 }
912
913 static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol,
914 int op_flag,
915 unsigned int size,
916 unsigned int __user *tlv)
917 {
918 struct user_element *ue = kcontrol->private_data;
919 int change = 0;
920 void *new_data;
921
922 if (op_flag > 0) {
923 if (size > 1024 * 128) /* sane value */
924 return -EINVAL;
925
926 new_data = memdup_user(tlv, size);
927 if (IS_ERR(new_data))
928 return PTR_ERR(new_data);
929 change = ue->tlv_data_size != size;
930 if (!change)
931 change = memcmp(ue->tlv_data, new_data, size);
932 kfree(ue->tlv_data);
933 ue->tlv_data = new_data;
934 ue->tlv_data_size = size;
935 } else {
936 if (! ue->tlv_data_size || ! ue->tlv_data)
937 return -ENXIO;
938 if (size < ue->tlv_data_size)
939 return -ENOSPC;
940 if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size))
941 return -EFAULT;
942 }
943 return change;
944 }
945
946 static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol)
947 {
948 struct user_element *ue = kcontrol->private_data;
949 if (ue->tlv_data)
950 kfree(ue->tlv_data);
951 kfree(ue);
952 }
953
954 static int snd_ctl_elem_add(struct snd_ctl_file *file,
955 struct snd_ctl_elem_info *info, int replace)
956 {
957 struct snd_card *card = file->card;
958 struct snd_kcontrol kctl, *_kctl;
959 unsigned int access;
960 long private_size;
961 struct user_element *ue;
962 int idx, err;
963
964 if (card->user_ctl_count >= MAX_USER_CONTROLS)
965 return -ENOMEM;
966 if (info->count < 1)
967 return -EINVAL;
968 access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
969 (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
970 SNDRV_CTL_ELEM_ACCESS_INACTIVE|
971 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE));
972 info->id.numid = 0;
973 memset(&kctl, 0, sizeof(kctl));
974 down_write(&card->controls_rwsem);
975 _kctl = snd_ctl_find_id(card, &info->id);
976 err = 0;
977 if (_kctl) {
978 if (replace)
979 err = snd_ctl_remove(card, _kctl);
980 else
981 err = -EBUSY;
982 } else {
983 if (replace)
984 err = -ENOENT;
985 }
986 up_write(&card->controls_rwsem);
987 if (err < 0)
988 return err;
989 memcpy(&kctl.id, &info->id, sizeof(info->id));
990 kctl.count = info->owner ? info->owner : 1;
991 access |= SNDRV_CTL_ELEM_ACCESS_USER;
992 kctl.info = snd_ctl_elem_user_info;
993 if (access & SNDRV_CTL_ELEM_ACCESS_READ)
994 kctl.get = snd_ctl_elem_user_get;
995 if (access & SNDRV_CTL_ELEM_ACCESS_WRITE)
996 kctl.put = snd_ctl_elem_user_put;
997 if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) {
998 kctl.tlv.c = snd_ctl_elem_user_tlv;
999 access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1000 }
1001 switch (info->type) {
1002 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
1003 case SNDRV_CTL_ELEM_TYPE_INTEGER:
1004 private_size = sizeof(long);
1005 if (info->count > 128)
1006 return -EINVAL;
1007 break;
1008 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
1009 private_size = sizeof(long long);
1010 if (info->count > 64)
1011 return -EINVAL;
1012 break;
1013 case SNDRV_CTL_ELEM_TYPE_BYTES:
1014 private_size = sizeof(unsigned char);
1015 if (info->count > 512)
1016 return -EINVAL;
1017 break;
1018 case SNDRV_CTL_ELEM_TYPE_IEC958:
1019 private_size = sizeof(struct snd_aes_iec958);
1020 if (info->count != 1)
1021 return -EINVAL;
1022 break;
1023 default:
1024 return -EINVAL;
1025 }
1026 private_size *= info->count;
1027 ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL);
1028 if (ue == NULL)
1029 return -ENOMEM;
1030 ue->info = *info;
1031 ue->info.access = 0;
1032 ue->elem_data = (char *)ue + sizeof(*ue);
1033 ue->elem_data_size = private_size;
1034 kctl.private_free = snd_ctl_elem_user_free;
1035 _kctl = snd_ctl_new(&kctl, access);
1036 if (_kctl == NULL) {
1037 kfree(ue);
1038 return -ENOMEM;
1039 }
1040 _kctl->private_data = ue;
1041 for (idx = 0; idx < _kctl->count; idx++)
1042 _kctl->vd[idx].owner = file;
1043 err = snd_ctl_add(card, _kctl);
1044 if (err < 0)
1045 return err;
1046
1047 down_write(&card->controls_rwsem);
1048 card->user_ctl_count++;
1049 up_write(&card->controls_rwsem);
1050
1051 return 0;
1052 }
1053
1054 static int snd_ctl_elem_add_user(struct snd_ctl_file *file,
1055 struct snd_ctl_elem_info __user *_info, int replace)
1056 {
1057 struct snd_ctl_elem_info info;
1058 if (copy_from_user(&info, _info, sizeof(info)))
1059 return -EFAULT;
1060 return snd_ctl_elem_add(file, &info, replace);
1061 }
1062
1063 static int snd_ctl_elem_remove(struct snd_ctl_file *file,
1064 struct snd_ctl_elem_id __user *_id)
1065 {
1066 struct snd_ctl_elem_id id;
1067
1068 if (copy_from_user(&id, _id, sizeof(id)))
1069 return -EFAULT;
1070 return snd_ctl_remove_user_ctl(file, &id);
1071 }
1072
1073 static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr)
1074 {
1075 int subscribe;
1076 if (get_user(subscribe, ptr))
1077 return -EFAULT;
1078 if (subscribe < 0) {
1079 subscribe = file->subscribed;
1080 if (put_user(subscribe, ptr))
1081 return -EFAULT;
1082 return 0;
1083 }
1084 if (subscribe) {
1085 file->subscribed = 1;
1086 return 0;
1087 } else if (file->subscribed) {
1088 snd_ctl_empty_read_queue(file);
1089 file->subscribed = 0;
1090 }
1091 return 0;
1092 }
1093
1094 static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file,
1095 struct snd_ctl_tlv __user *_tlv,
1096 int op_flag)
1097 {
1098 struct snd_card *card = file->card;
1099 struct snd_ctl_tlv tlv;
1100 struct snd_kcontrol *kctl;
1101 struct snd_kcontrol_volatile *vd;
1102 unsigned int len;
1103 int err = 0;
1104
1105 if (copy_from_user(&tlv, _tlv, sizeof(tlv)))
1106 return -EFAULT;
1107 if (tlv.length < sizeof(unsigned int) * 2)
1108 return -EINVAL;
1109 down_read(&card->controls_rwsem);
1110 kctl = snd_ctl_find_numid(card, tlv.numid);
1111 if (kctl == NULL) {
1112 err = -ENOENT;
1113 goto __kctl_end;
1114 }
1115 if (kctl->tlv.p == NULL) {
1116 err = -ENXIO;
1117 goto __kctl_end;
1118 }
1119 vd = &kctl->vd[tlv.numid - kctl->id.numid];
1120 if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) ||
1121 (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) ||
1122 (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) {
1123 err = -ENXIO;
1124 goto __kctl_end;
1125 }
1126 if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) {
1127 if (vd->owner != NULL && vd->owner != file) {
1128 err = -EPERM;
1129 goto __kctl_end;
1130 }
1131 err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv);
1132 if (err > 0) {
1133 up_read(&card->controls_rwsem);
1134 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id);
1135 return 0;
1136 }
1137 } else {
1138 if (op_flag) {
1139 err = -ENXIO;
1140 goto __kctl_end;
1141 }
1142 len = kctl->tlv.p[1] + 2 * sizeof(unsigned int);
1143 if (tlv.length < len) {
1144 err = -ENOMEM;
1145 goto __kctl_end;
1146 }
1147 if (copy_to_user(_tlv->tlv, kctl->tlv.p, len))
1148 err = -EFAULT;
1149 }
1150 __kctl_end:
1151 up_read(&card->controls_rwsem);
1152 return err;
1153 }
1154
1155 static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1156 {
1157 struct snd_ctl_file *ctl;
1158 struct snd_card *card;
1159 struct snd_kctl_ioctl *p;
1160 void __user *argp = (void __user *)arg;
1161 int __user *ip = argp;
1162 int err;
1163
1164 ctl = file->private_data;
1165 card = ctl->card;
1166 if (snd_BUG_ON(!card))
1167 return -ENXIO;
1168 switch (cmd) {
1169 case SNDRV_CTL_IOCTL_PVERSION:
1170 return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0;
1171 case SNDRV_CTL_IOCTL_CARD_INFO:
1172 return snd_ctl_card_info(card, ctl, cmd, argp);
1173 case SNDRV_CTL_IOCTL_ELEM_LIST:
1174 return snd_ctl_elem_list(card, argp);
1175 case SNDRV_CTL_IOCTL_ELEM_INFO:
1176 return snd_ctl_elem_info_user(ctl, argp);
1177 case SNDRV_CTL_IOCTL_ELEM_READ:
1178 return snd_ctl_elem_read_user(card, argp);
1179 case SNDRV_CTL_IOCTL_ELEM_WRITE:
1180 return snd_ctl_elem_write_user(ctl, argp);
1181 case SNDRV_CTL_IOCTL_ELEM_LOCK:
1182 return snd_ctl_elem_lock(ctl, argp);
1183 case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
1184 return snd_ctl_elem_unlock(ctl, argp);
1185 case SNDRV_CTL_IOCTL_ELEM_ADD:
1186 return snd_ctl_elem_add_user(ctl, argp, 0);
1187 case SNDRV_CTL_IOCTL_ELEM_REPLACE:
1188 return snd_ctl_elem_add_user(ctl, argp, 1);
1189 case SNDRV_CTL_IOCTL_ELEM_REMOVE:
1190 return snd_ctl_elem_remove(ctl, argp);
1191 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
1192 return snd_ctl_subscribe_events(ctl, ip);
1193 case SNDRV_CTL_IOCTL_TLV_READ:
1194 return snd_ctl_tlv_ioctl(ctl, argp, 0);
1195 case SNDRV_CTL_IOCTL_TLV_WRITE:
1196 return snd_ctl_tlv_ioctl(ctl, argp, 1);
1197 case SNDRV_CTL_IOCTL_TLV_COMMAND:
1198 return snd_ctl_tlv_ioctl(ctl, argp, -1);
1199 case SNDRV_CTL_IOCTL_POWER:
1200 return -ENOPROTOOPT;
1201 case SNDRV_CTL_IOCTL_POWER_STATE:
1202 #ifdef CONFIG_PM
1203 return put_user(card->power_state, ip) ? -EFAULT : 0;
1204 #else
1205 return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0;
1206 #endif
1207 }
1208 down_read(&snd_ioctl_rwsem);
1209 list_for_each_entry(p, &snd_control_ioctls, list) {
1210 err = p->fioctl(card, ctl, cmd, arg);
1211 if (err != -ENOIOCTLCMD) {
1212 up_read(&snd_ioctl_rwsem);
1213 return err;
1214 }
1215 }
1216 up_read(&snd_ioctl_rwsem);
1217 snd_printdd("unknown ioctl = 0x%x\n", cmd);
1218 return -ENOTTY;
1219 }
1220
1221 static ssize_t snd_ctl_read(struct file *file, char __user *buffer,
1222 size_t count, loff_t * offset)
1223 {
1224 struct snd_ctl_file *ctl;
1225 int err = 0;
1226 ssize_t result = 0;
1227
1228 ctl = file->private_data;
1229 if (snd_BUG_ON(!ctl || !ctl->card))
1230 return -ENXIO;
1231 if (!ctl->subscribed)
1232 return -EBADFD;
1233 if (count < sizeof(struct snd_ctl_event))
1234 return -EINVAL;
1235 spin_lock_irq(&ctl->read_lock);
1236 while (count >= sizeof(struct snd_ctl_event)) {
1237 struct snd_ctl_event ev;
1238 struct snd_kctl_event *kev;
1239 while (list_empty(&ctl->events)) {
1240 wait_queue_t wait;
1241 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1242 err = -EAGAIN;
1243 goto __end_lock;
1244 }
1245 init_waitqueue_entry(&wait, current);
1246 add_wait_queue(&ctl->change_sleep, &wait);
1247 set_current_state(TASK_INTERRUPTIBLE);
1248 spin_unlock_irq(&ctl->read_lock);
1249 schedule();
1250 remove_wait_queue(&ctl->change_sleep, &wait);
1251 if (signal_pending(current))
1252 return -ERESTARTSYS;
1253 spin_lock_irq(&ctl->read_lock);
1254 }
1255 kev = snd_kctl_event(ctl->events.next);
1256 ev.type = SNDRV_CTL_EVENT_ELEM;
1257 ev.data.elem.mask = kev->mask;
1258 ev.data.elem.id = kev->id;
1259 list_del(&kev->list);
1260 spin_unlock_irq(&ctl->read_lock);
1261 kfree(kev);
1262 if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) {
1263 err = -EFAULT;
1264 goto __end;
1265 }
1266 spin_lock_irq(&ctl->read_lock);
1267 buffer += sizeof(struct snd_ctl_event);
1268 count -= sizeof(struct snd_ctl_event);
1269 result += sizeof(struct snd_ctl_event);
1270 }
1271 __end_lock:
1272 spin_unlock_irq(&ctl->read_lock);
1273 __end:
1274 return result > 0 ? result : err;
1275 }
1276
1277 static unsigned int snd_ctl_poll(struct file *file, poll_table * wait)
1278 {
1279 unsigned int mask;
1280 struct snd_ctl_file *ctl;
1281
1282 ctl = file->private_data;
1283 if (!ctl->subscribed)
1284 return 0;
1285 poll_wait(file, &ctl->change_sleep, wait);
1286
1287 mask = 0;
1288 if (!list_empty(&ctl->events))
1289 mask |= POLLIN | POLLRDNORM;
1290
1291 return mask;
1292 }
1293
1294 /*
1295 * register the device-specific control-ioctls.
1296 * called from each device manager like pcm.c, hwdep.c, etc.
1297 */
1298 static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists)
1299 {
1300 struct snd_kctl_ioctl *pn;
1301
1302 pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL);
1303 if (pn == NULL)
1304 return -ENOMEM;
1305 pn->fioctl = fcn;
1306 down_write(&snd_ioctl_rwsem);
1307 list_add_tail(&pn->list, lists);
1308 up_write(&snd_ioctl_rwsem);
1309 return 0;
1310 }
1311
1312 int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn)
1313 {
1314 return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls);
1315 }
1316
1317 EXPORT_SYMBOL(snd_ctl_register_ioctl);
1318
1319 #ifdef CONFIG_COMPAT
1320 int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1321 {
1322 return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls);
1323 }
1324
1325 EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
1326 #endif
1327
1328 /*
1329 * de-register the device-specific control-ioctls.
1330 */
1331 static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn,
1332 struct list_head *lists)
1333 {
1334 struct snd_kctl_ioctl *p;
1335
1336 if (snd_BUG_ON(!fcn))
1337 return -EINVAL;
1338 down_write(&snd_ioctl_rwsem);
1339 list_for_each_entry(p, lists, list) {
1340 if (p->fioctl == fcn) {
1341 list_del(&p->list);
1342 up_write(&snd_ioctl_rwsem);
1343 kfree(p);
1344 return 0;
1345 }
1346 }
1347 up_write(&snd_ioctl_rwsem);
1348 snd_BUG();
1349 return -EINVAL;
1350 }
1351
1352 int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn)
1353 {
1354 return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls);
1355 }
1356
1357 EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
1358
1359 #ifdef CONFIG_COMPAT
1360 int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1361 {
1362 return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls);
1363 }
1364
1365 EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
1366 #endif
1367
1368 static int snd_ctl_fasync(int fd, struct file * file, int on)
1369 {
1370 struct snd_ctl_file *ctl;
1371
1372 ctl = file->private_data;
1373 return fasync_helper(fd, file, on, &ctl->fasync);
1374 }
1375
1376 /*
1377 * ioctl32 compat
1378 */
1379 #ifdef CONFIG_COMPAT
1380 #include "control_compat.c"
1381 #else
1382 #define snd_ctl_ioctl_compat NULL
1383 #endif
1384
1385 /*
1386 * INIT PART
1387 */
1388
1389 static const struct file_operations snd_ctl_f_ops =
1390 {
1391 .owner = THIS_MODULE,
1392 .read = snd_ctl_read,
1393 .open = snd_ctl_open,
1394 .release = snd_ctl_release,
1395 .llseek = no_llseek,
1396 .poll = snd_ctl_poll,
1397 .unlocked_ioctl = snd_ctl_ioctl,
1398 .compat_ioctl = snd_ctl_ioctl_compat,
1399 .fasync = snd_ctl_fasync,
1400 };
1401
1402 /*
1403 * registration of the control device
1404 */
1405 static int snd_ctl_dev_register(struct snd_device *device)
1406 {
1407 struct snd_card *card = device->device_data;
1408 int err, cardnum;
1409 char name[16];
1410
1411 if (snd_BUG_ON(!card))
1412 return -ENXIO;
1413 cardnum = card->number;
1414 if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1415 return -ENXIO;
1416 sprintf(name, "controlC%i", cardnum);
1417 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
1418 &snd_ctl_f_ops, card, name)) < 0)
1419 return err;
1420 return 0;
1421 }
1422
1423 /*
1424 * disconnection of the control device
1425 */
1426 static int snd_ctl_dev_disconnect(struct snd_device *device)
1427 {
1428 struct snd_card *card = device->device_data;
1429 struct snd_ctl_file *ctl;
1430 int err, cardnum;
1431
1432 if (snd_BUG_ON(!card))
1433 return -ENXIO;
1434 cardnum = card->number;
1435 if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1436 return -ENXIO;
1437
1438 read_lock(&card->ctl_files_rwlock);
1439 list_for_each_entry(ctl, &card->ctl_files, list) {
1440 wake_up(&ctl->change_sleep);
1441 kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);
1442 }
1443 read_unlock(&card->ctl_files_rwlock);
1444
1445 if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL,
1446 card, -1)) < 0)
1447 return err;
1448 return 0;
1449 }
1450
1451 /*
1452 * free all controls
1453 */
1454 static int snd_ctl_dev_free(struct snd_device *device)
1455 {
1456 struct snd_card *card = device->device_data;
1457 struct snd_kcontrol *control;
1458
1459 down_write(&card->controls_rwsem);
1460 while (!list_empty(&card->controls)) {
1461 control = snd_kcontrol(card->controls.next);
1462 snd_ctl_remove(card, control);
1463 }
1464 up_write(&card->controls_rwsem);
1465 return 0;
1466 }
1467
1468 /*
1469 * create control core:
1470 * called from init.c
1471 */
1472 int snd_ctl_create(struct snd_card *card)
1473 {
1474 static struct snd_device_ops ops = {
1475 .dev_free = snd_ctl_dev_free,
1476 .dev_register = snd_ctl_dev_register,
1477 .dev_disconnect = snd_ctl_dev_disconnect,
1478 };
1479
1480 if (snd_BUG_ON(!card))
1481 return -ENXIO;
1482 return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);
1483 }
1484
1485 /*
1486 * Frequently used control callbacks
1487 */
1488 int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
1489 struct snd_ctl_elem_info *uinfo)
1490 {
1491 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1492 uinfo->count = 1;
1493 uinfo->value.integer.min = 0;
1494 uinfo->value.integer.max = 1;
1495 return 0;
1496 }
1497
1498 EXPORT_SYMBOL(snd_ctl_boolean_mono_info);
1499
1500 int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
1501 struct snd_ctl_elem_info *uinfo)
1502 {
1503 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1504 uinfo->count = 2;
1505 uinfo->value.integer.min = 0;
1506 uinfo->value.integer.max = 1;
1507 return 0;
1508 }
1509
1510 EXPORT_SYMBOL(snd_ctl_boolean_stereo_info);
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