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eeepc-laptop: makes get_acpi() returns -ENODEV
[linux-2.6/linux-acpi-2.6.git] / sound / core / control.c
blob17b8d47a5cd07f2fca53ec7ef31d935a8958b327
1 /*
2 * Routines for driver control interface
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/threads.h>
23 #include <linux/interrupt.h>
24 #include <linux/slab.h>
25 #include <linux/vmalloc.h>
26 #include <linux/time.h>
27 #include <sound/core.h>
28 #include <sound/minors.h>
29 #include <sound/info.h>
30 #include <sound/control.h>
31
32 /* max number of user-defined controls */
33 #define MAX_USER_CONTROLS 32
34
35 struct snd_kctl_ioctl {
36 struct list_head list; /* list of all ioctls */
37 snd_kctl_ioctl_func_t fioctl;
38 };
39
40 static DECLARE_RWSEM(snd_ioctl_rwsem);
41 static LIST_HEAD(snd_control_ioctls);
42 #ifdef CONFIG_COMPAT
43 static LIST_HEAD(snd_control_compat_ioctls);
44 #endif
45
46 static int snd_ctl_open(struct inode *inode, struct file *file)
47 {
48 unsigned long flags;
49 struct snd_card *card;
50 struct snd_ctl_file *ctl;
51 int err;
52
53 card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL);
54 if (!card) {
55 err = -ENODEV;
56 goto __error1;
57 }
58 err = snd_card_file_add(card, file);
59 if (err < 0) {
60 err = -ENODEV;
61 goto __error1;
62 }
63 if (!try_module_get(card->module)) {
64 err = -EFAULT;
65 goto __error2;
66 }
67 ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
68 if (ctl == NULL) {
69 err = -ENOMEM;
70 goto __error;
71 }
72 INIT_LIST_HEAD(&ctl->events);
73 init_waitqueue_head(&ctl->change_sleep);
74 spin_lock_init(&ctl->read_lock);
75 ctl->card = card;
76 ctl->prefer_pcm_subdevice = -1;
77 ctl->prefer_rawmidi_subdevice = -1;
78 ctl->pid = current->pid;
79 file->private_data = ctl;
80 write_lock_irqsave(&card->ctl_files_rwlock, flags);
81 list_add_tail(&ctl->list, &card->ctl_files);
82 write_unlock_irqrestore(&card->ctl_files_rwlock, flags);
83 return 0;
84
85 __error:
86 module_put(card->module);
87 __error2:
88 snd_card_file_remove(card, file);
89 __error1:
90 return err;
91 }
92
93 static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl)
94 {
95 unsigned long flags;
96 struct snd_kctl_event *cread;
97
98 spin_lock_irqsave(&ctl->read_lock, flags);
99 while (!list_empty(&ctl->events)) {
100 cread = snd_kctl_event(ctl->events.next);
101 list_del(&cread->list);
102 kfree(cread);
103 }
104 spin_unlock_irqrestore(&ctl->read_lock, flags);
105 }
106
107 static int snd_ctl_release(struct inode *inode, struct file *file)
108 {
109 unsigned long flags;
110 struct snd_card *card;
111 struct snd_ctl_file *ctl;
112 struct snd_kcontrol *control;
113 unsigned int idx;
114
115 ctl = file->private_data;
116 file->private_data = NULL;
117 card = ctl->card;
118 write_lock_irqsave(&card->ctl_files_rwlock, flags);
119 list_del(&ctl->list);
120 write_unlock_irqrestore(&card->ctl_files_rwlock, flags);
121 down_write(&card->controls_rwsem);
122 list_for_each_entry(control, &card->controls, list)
123 for (idx = 0; idx < control->count; idx++)
124 if (control->vd[idx].owner == ctl)
125 control->vd[idx].owner = NULL;
126 up_write(&card->controls_rwsem);
127 snd_ctl_empty_read_queue(ctl);
128 kfree(ctl);
129 module_put(card->module);
130 snd_card_file_remove(card, file);
131 return 0;
132 }
133
134 void snd_ctl_notify(struct snd_card *card, unsigned int mask,
135 struct snd_ctl_elem_id *id)
136 {
137 unsigned long flags;
138 struct snd_ctl_file *ctl;
139 struct snd_kctl_event *ev;
140
141 if (snd_BUG_ON(!card || !id))
142 return;
143 read_lock(&card->ctl_files_rwlock);
144 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
145 card->mixer_oss_change_count++;
146 #endif
147 list_for_each_entry(ctl, &card->ctl_files, list) {
148 if (!ctl->subscribed)
149 continue;
150 spin_lock_irqsave(&ctl->read_lock, flags);
151 list_for_each_entry(ev, &ctl->events, list) {
152 if (ev->id.numid == id->numid) {
153 ev->mask |= mask;
154 goto _found;
155 }
156 }
157 ev = kzalloc(sizeof(*ev), GFP_ATOMIC);
158 if (ev) {
159 ev->id = *id;
160 ev->mask = mask;
161 list_add_tail(&ev->list, &ctl->events);
162 } else {
163 snd_printk(KERN_ERR "No memory available to allocate event\n");
164 }
165 _found:
166 wake_up(&ctl->change_sleep);
167 spin_unlock_irqrestore(&ctl->read_lock, flags);
168 kill_fasync(&ctl->fasync, SIGIO, POLL_IN);
169 }
170 read_unlock(&card->ctl_files_rwlock);
171 }
172
173 EXPORT_SYMBOL(snd_ctl_notify);
174
175 /**
176 * snd_ctl_new - create a control instance from the template
177 * @control: the control template
178 * @access: the default control access
179 *
180 * Allocates a new struct snd_kcontrol instance and copies the given template
181 * to the new instance. It does not copy volatile data (access).
182 *
183 * Returns the pointer of the new instance, or NULL on failure.
184 */
185 static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control,
186 unsigned int access)
187 {
188 struct snd_kcontrol *kctl;
189 unsigned int idx;
190
191 if (snd_BUG_ON(!control || !control->count))
192 return NULL;
193 kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL);
194 if (kctl == NULL) {
195 snd_printk(KERN_ERR "Cannot allocate control instance\n");
196 return NULL;
197 }
198 *kctl = *control;
199 for (idx = 0; idx < kctl->count; idx++)
200 kctl->vd[idx].access = access;
201 return kctl;
202 }
203
204 /**
205 * snd_ctl_new1 - create a control instance from the template
206 * @ncontrol: the initialization record
207 * @private_data: the private data to set
208 *
209 * Allocates a new struct snd_kcontrol instance and initialize from the given
210 * template. When the access field of ncontrol is 0, it's assumed as
211 * READWRITE access. When the count field is 0, it's assumes as one.
212 *
213 * Returns the pointer of the newly generated instance, or NULL on failure.
214 */
215 struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol,
216 void *private_data)
217 {
218 struct snd_kcontrol kctl;
219 unsigned int access;
220
221 if (snd_BUG_ON(!ncontrol || !ncontrol->info))
222 return NULL;
223 memset(&kctl, 0, sizeof(kctl));
224 kctl.id.iface = ncontrol->iface;
225 kctl.id.device = ncontrol->device;
226 kctl.id.subdevice = ncontrol->subdevice;
227 if (ncontrol->name) {
228 strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name));
229 if (strcmp(ncontrol->name, kctl.id.name) != 0)
230 snd_printk(KERN_WARNING
231 "Control name '%s' truncated to '%s'\n",
232 ncontrol->name, kctl.id.name);
233 }
234 kctl.id.index = ncontrol->index;
235 kctl.count = ncontrol->count ? ncontrol->count : 1;
236 access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
237 (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
238 SNDRV_CTL_ELEM_ACCESS_INACTIVE|
239 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE|
240 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK));
241 kctl.info = ncontrol->info;
242 kctl.get = ncontrol->get;
243 kctl.put = ncontrol->put;
244 kctl.tlv.p = ncontrol->tlv.p;
245 kctl.private_value = ncontrol->private_value;
246 kctl.private_data = private_data;
247 return snd_ctl_new(&kctl, access);
248 }
249
250 EXPORT_SYMBOL(snd_ctl_new1);
251
252 /**
253 * snd_ctl_free_one - release the control instance
254 * @kcontrol: the control instance
255 *
256 * Releases the control instance created via snd_ctl_new()
257 * or snd_ctl_new1().
258 * Don't call this after the control was added to the card.
259 */
260 void snd_ctl_free_one(struct snd_kcontrol *kcontrol)
261 {
262 if (kcontrol) {
263 if (kcontrol->private_free)
264 kcontrol->private_free(kcontrol);
265 kfree(kcontrol);
266 }
267 }
268
269 EXPORT_SYMBOL(snd_ctl_free_one);
270
271 static unsigned int snd_ctl_hole_check(struct snd_card *card,
272 unsigned int count)
273 {
274 struct snd_kcontrol *kctl;
275
276 list_for_each_entry(kctl, &card->controls, list) {
277 if ((kctl->id.numid <= card->last_numid &&
278 kctl->id.numid + kctl->count > card->last_numid) ||
279 (kctl->id.numid <= card->last_numid + count - 1 &&
280 kctl->id.numid + kctl->count > card->last_numid + count - 1))
281 return card->last_numid = kctl->id.numid + kctl->count - 1;
282 }
283 return card->last_numid;
284 }
285
286 static int snd_ctl_find_hole(struct snd_card *card, unsigned int count)
287 {
288 unsigned int last_numid, iter = 100000;
289
290 last_numid = card->last_numid;
291 while (last_numid != snd_ctl_hole_check(card, count)) {
292 if (--iter == 0) {
293 /* this situation is very unlikely */
294 snd_printk(KERN_ERR "unable to allocate new control numid\n");
295 return -ENOMEM;
296 }
297 last_numid = card->last_numid;
298 }
299 return 0;
300 }
301
302 /**
303 * snd_ctl_add - add the control instance to the card
304 * @card: the card instance
305 * @kcontrol: the control instance to add
306 *
307 * Adds the control instance created via snd_ctl_new() or
308 * snd_ctl_new1() to the given card. Assigns also an unique
309 * numid used for fast search.
310 *
311 * Returns zero if successful, or a negative error code on failure.
312 *
313 * It frees automatically the control which cannot be added.
314 */
315 int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
316 {
317 struct snd_ctl_elem_id id;
318 unsigned int idx;
319 int err = -EINVAL;
320
321 if (! kcontrol)
322 return err;
323 if (snd_BUG_ON(!card || !kcontrol->info))
324 goto error;
325 id = kcontrol->id;
326 down_write(&card->controls_rwsem);
327 if (snd_ctl_find_id(card, &id)) {
328 up_write(&card->controls_rwsem);
329 snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n",
330 id.iface,
331 id.device,
332 id.subdevice,
333 id.name,
334 id.index);
335 err = -EBUSY;
336 goto error;
337 }
338 if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
339 up_write(&card->controls_rwsem);
340 err = -ENOMEM;
341 goto error;
342 }
343 list_add_tail(&kcontrol->list, &card->controls);
344 card->controls_count += kcontrol->count;
345 kcontrol->id.numid = card->last_numid + 1;
346 card->last_numid += kcontrol->count;
347 up_write(&card->controls_rwsem);
348 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
349 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
350 return 0;
351
352 error:
353 snd_ctl_free_one(kcontrol);
354 return err;
355 }
356
357 EXPORT_SYMBOL(snd_ctl_add);
358
359 /**
360 * snd_ctl_remove - remove the control from the card and release it
361 * @card: the card instance
362 * @kcontrol: the control instance to remove
363 *
364 * Removes the control from the card and then releases the instance.
365 * You don't need to call snd_ctl_free_one(). You must be in
366 * the write lock - down_write(&card->controls_rwsem).
367 *
368 * Returns 0 if successful, or a negative error code on failure.
369 */
370 int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol)
371 {
372 struct snd_ctl_elem_id id;
373 unsigned int idx;
374
375 if (snd_BUG_ON(!card || !kcontrol))
376 return -EINVAL;
377 list_del(&kcontrol->list);
378 card->controls_count -= kcontrol->count;
379 id = kcontrol->id;
380 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
381 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id);
382 snd_ctl_free_one(kcontrol);
383 return 0;
384 }
385
386 EXPORT_SYMBOL(snd_ctl_remove);
387
388 /**
389 * snd_ctl_remove_id - remove the control of the given id and release it
390 * @card: the card instance
391 * @id: the control id to remove
392 *
393 * Finds the control instance with the given id, removes it from the
394 * card list and releases it.
395 *
396 * Returns 0 if successful, or a negative error code on failure.
397 */
398 int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id)
399 {
400 struct snd_kcontrol *kctl;
401 int ret;
402
403 down_write(&card->controls_rwsem);
404 kctl = snd_ctl_find_id(card, id);
405 if (kctl == NULL) {
406 up_write(&card->controls_rwsem);
407 return -ENOENT;
408 }
409 ret = snd_ctl_remove(card, kctl);
410 up_write(&card->controls_rwsem);
411 return ret;
412 }
413
414 EXPORT_SYMBOL(snd_ctl_remove_id);
415
416 /**
417 * snd_ctl_remove_unlocked_id - remove the unlocked control of the given id and release it
418 * @file: active control handle
419 * @id: the control id to remove
420 *
421 * Finds the control instance with the given id, removes it from the
422 * card list and releases it.
423 *
424 * Returns 0 if successful, or a negative error code on failure.
425 */
426 static int snd_ctl_remove_unlocked_id(struct snd_ctl_file * file,
427 struct snd_ctl_elem_id *id)
428 {
429 struct snd_card *card = file->card;
430 struct snd_kcontrol *kctl;
431 int idx, ret;
432
433 down_write(&card->controls_rwsem);
434 kctl = snd_ctl_find_id(card, id);
435 if (kctl == NULL) {
436 up_write(&card->controls_rwsem);
437 return -ENOENT;
438 }
439 for (idx = 0; idx < kctl->count; idx++)
440 if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {
441 up_write(&card->controls_rwsem);
442 return -EBUSY;
443 }
444 ret = snd_ctl_remove(card, kctl);
445 up_write(&card->controls_rwsem);
446 return ret;
447 }
448
449 /**
450 * snd_ctl_rename_id - replace the id of a control on the card
451 * @card: the card instance
452 * @src_id: the old id
453 * @dst_id: the new id
454 *
455 * Finds the control with the old id from the card, and replaces the
456 * id with the new one.
457 *
458 * Returns zero if successful, or a negative error code on failure.
459 */
460 int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id,
461 struct snd_ctl_elem_id *dst_id)
462 {
463 struct snd_kcontrol *kctl;
464
465 down_write(&card->controls_rwsem);
466 kctl = snd_ctl_find_id(card, src_id);
467 if (kctl == NULL) {
468 up_write(&card->controls_rwsem);
469 return -ENOENT;
470 }
471 kctl->id = *dst_id;
472 kctl->id.numid = card->last_numid + 1;
473 card->last_numid += kctl->count;
474 up_write(&card->controls_rwsem);
475 return 0;
476 }
477
478 EXPORT_SYMBOL(snd_ctl_rename_id);
479
480 /**
481 * snd_ctl_find_numid - find the control instance with the given number-id
482 * @card: the card instance
483 * @numid: the number-id to search
484 *
485 * Finds the control instance with the given number-id from the card.
486 *
487 * Returns the pointer of the instance if found, or NULL if not.
488 *
489 * The caller must down card->controls_rwsem before calling this function
490 * (if the race condition can happen).
491 */
492 struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid)
493 {
494 struct snd_kcontrol *kctl;
495
496 if (snd_BUG_ON(!card || !numid))
497 return NULL;
498 list_for_each_entry(kctl, &card->controls, list) {
499 if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid)
500 return kctl;
501 }
502 return NULL;
503 }
504
505 EXPORT_SYMBOL(snd_ctl_find_numid);
506
507 /**
508 * snd_ctl_find_id - find the control instance with the given id
509 * @card: the card instance
510 * @id: the id to search
511 *
512 * Finds the control instance with the given id from the card.
513 *
514 * Returns the pointer of the instance if found, or NULL if not.
515 *
516 * The caller must down card->controls_rwsem before calling this function
517 * (if the race condition can happen).
518 */
519 struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card,
520 struct snd_ctl_elem_id *id)
521 {
522 struct snd_kcontrol *kctl;
523
524 if (snd_BUG_ON(!card || !id))
525 return NULL;
526 if (id->numid != 0)
527 return snd_ctl_find_numid(card, id->numid);
528 list_for_each_entry(kctl, &card->controls, list) {
529 if (kctl->id.iface != id->iface)
530 continue;
531 if (kctl->id.device != id->device)
532 continue;
533 if (kctl->id.subdevice != id->subdevice)
534 continue;
535 if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name)))
536 continue;
537 if (kctl->id.index > id->index)
538 continue;
539 if (kctl->id.index + kctl->count <= id->index)
540 continue;
541 return kctl;
542 }
543 return NULL;
544 }
545
546 EXPORT_SYMBOL(snd_ctl_find_id);
547
548 static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,
549 unsigned int cmd, void __user *arg)
550 {
551 struct snd_ctl_card_info *info;
552
553 info = kzalloc(sizeof(*info), GFP_KERNEL);
554 if (! info)
555 return -ENOMEM;
556 down_read(&snd_ioctl_rwsem);
557 info->card = card->number;
558 strlcpy(info->id, card->id, sizeof(info->id));
559 strlcpy(info->driver, card->driver, sizeof(info->driver));
560 strlcpy(info->name, card->shortname, sizeof(info->name));
561 strlcpy(info->longname, card->longname, sizeof(info->longname));
562 strlcpy(info->mixername, card->mixername, sizeof(info->mixername));
563 strlcpy(info->components, card->components, sizeof(info->components));
564 up_read(&snd_ioctl_rwsem);
565 if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) {
566 kfree(info);
567 return -EFAULT;
568 }
569 kfree(info);
570 return 0;
571 }
572
573 static int snd_ctl_elem_list(struct snd_card *card,
574 struct snd_ctl_elem_list __user *_list)
575 {
576 struct list_head *plist;
577 struct snd_ctl_elem_list list;
578 struct snd_kcontrol *kctl;
579 struct snd_ctl_elem_id *dst, *id;
580 unsigned int offset, space, first, jidx;
581
582 if (copy_from_user(&list, _list, sizeof(list)))
583 return -EFAULT;
584 offset = list.offset;
585 space = list.space;
586 first = 0;
587 /* try limit maximum space */
588 if (space > 16384)
589 return -ENOMEM;
590 if (space > 0) {
591 /* allocate temporary buffer for atomic operation */
592 dst = vmalloc(space * sizeof(struct snd_ctl_elem_id));
593 if (dst == NULL)
594 return -ENOMEM;
595 down_read(&card->controls_rwsem);
596 list.count = card->controls_count;
597 plist = card->controls.next;
598 while (plist != &card->controls) {
599 if (offset == 0)
600 break;
601 kctl = snd_kcontrol(plist);
602 if (offset < kctl->count)
603 break;
604 offset -= kctl->count;
605 plist = plist->next;
606 }
607 list.used = 0;
608 id = dst;
609 while (space > 0 && plist != &card->controls) {
610 kctl = snd_kcontrol(plist);
611 for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) {
612 snd_ctl_build_ioff(id, kctl, jidx);
613 id++;
614 space--;
615 list.used++;
616 }
617 plist = plist->next;
618 offset = 0;
619 }
620 up_read(&card->controls_rwsem);
621 if (list.used > 0 &&
622 copy_to_user(list.pids, dst,
623 list.used * sizeof(struct snd_ctl_elem_id))) {
624 vfree(dst);
625 return -EFAULT;
626 }
627 vfree(dst);
628 } else {
629 down_read(&card->controls_rwsem);
630 list.count = card->controls_count;
631 up_read(&card->controls_rwsem);
632 }
633 if (copy_to_user(_list, &list, sizeof(list)))
634 return -EFAULT;
635 return 0;
636 }
637
638 static int snd_ctl_elem_info(struct snd_ctl_file *ctl,
639 struct snd_ctl_elem_info *info)
640 {
641 struct snd_card *card = ctl->card;
642 struct snd_kcontrol *kctl;
643 struct snd_kcontrol_volatile *vd;
644 unsigned int index_offset;
645 int result;
646
647 down_read(&card->controls_rwsem);
648 kctl = snd_ctl_find_id(card, &info->id);
649 if (kctl == NULL) {
650 up_read(&card->controls_rwsem);
651 return -ENOENT;
652 }
653 #ifdef CONFIG_SND_DEBUG
654 info->access = 0;
655 #endif
656 result = kctl->info(kctl, info);
657 if (result >= 0) {
658 snd_BUG_ON(info->access);
659 index_offset = snd_ctl_get_ioff(kctl, &info->id);
660 vd = &kctl->vd[index_offset];
661 snd_ctl_build_ioff(&info->id, kctl, index_offset);
662 info->access = vd->access;
663 if (vd->owner) {
664 info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK;
665 if (vd->owner == ctl)
666 info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER;
667 info->owner = vd->owner_pid;
668 } else {
669 info->owner = -1;
670 }
671 }
672 up_read(&card->controls_rwsem);
673 return result;
674 }
675
676 static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,
677 struct snd_ctl_elem_info __user *_info)
678 {
679 struct snd_ctl_elem_info info;
680 int result;
681
682 if (copy_from_user(&info, _info, sizeof(info)))
683 return -EFAULT;
684 snd_power_lock(ctl->card);
685 result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
686 if (result >= 0)
687 result = snd_ctl_elem_info(ctl, &info);
688 snd_power_unlock(ctl->card);
689 if (result >= 0)
690 if (copy_to_user(_info, &info, sizeof(info)))
691 return -EFAULT;
692 return result;
693 }
694
695 static int snd_ctl_elem_read(struct snd_card *card,
696 struct snd_ctl_elem_value *control)
697 {
698 struct snd_kcontrol *kctl;
699 struct snd_kcontrol_volatile *vd;
700 unsigned int index_offset;
701 int result;
702
703 down_read(&card->controls_rwsem);
704 kctl = snd_ctl_find_id(card, &control->id);
705 if (kctl == NULL) {
706 result = -ENOENT;
707 } else {
708 index_offset = snd_ctl_get_ioff(kctl, &control->id);
709 vd = &kctl->vd[index_offset];
710 if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) &&
711 kctl->get != NULL) {
712 snd_ctl_build_ioff(&control->id, kctl, index_offset);
713 result = kctl->get(kctl, control);
714 } else
715 result = -EPERM;
716 }
717 up_read(&card->controls_rwsem);
718 return result;
719 }
720
721 static int snd_ctl_elem_read_user(struct snd_card *card,
722 struct snd_ctl_elem_value __user *_control)
723 {
724 struct snd_ctl_elem_value *control;
725 int result;
726
727 control = memdup_user(_control, sizeof(*control));
728 if (IS_ERR(control))
729 return PTR_ERR(control);
730
731 snd_power_lock(card);
732 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
733 if (result >= 0)
734 result = snd_ctl_elem_read(card, control);
735 snd_power_unlock(card);
736 if (result >= 0)
737 if (copy_to_user(_control, control, sizeof(*control)))
738 result = -EFAULT;
739 kfree(control);
740 return result;
741 }
742
743 static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file,
744 struct snd_ctl_elem_value *control)
745 {
746 struct snd_kcontrol *kctl;
747 struct snd_kcontrol_volatile *vd;
748 unsigned int index_offset;
749 int result;
750
751 down_read(&card->controls_rwsem);
752 kctl = snd_ctl_find_id(card, &control->id);
753 if (kctl == NULL) {
754 result = -ENOENT;
755 } else {
756 index_offset = snd_ctl_get_ioff(kctl, &control->id);
757 vd = &kctl->vd[index_offset];
758 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) ||
759 kctl->put == NULL ||
760 (file && vd->owner && vd->owner != file)) {
761 result = -EPERM;
762 } else {
763 snd_ctl_build_ioff(&control->id, kctl, index_offset);
764 result = kctl->put(kctl, control);
765 }
766 if (result > 0) {
767 up_read(&card->controls_rwsem);
768 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
769 &control->id);
770 return 0;
771 }
772 }
773 up_read(&card->controls_rwsem);
774 return result;
775 }
776
777 static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
778 struct snd_ctl_elem_value __user *_control)
779 {
780 struct snd_ctl_elem_value *control;
781 struct snd_card *card;
782 int result;
783
784 control = memdup_user(_control, sizeof(*control));
785 if (IS_ERR(control))
786 return PTR_ERR(control);
787
788 card = file->card;
789 snd_power_lock(card);
790 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
791 if (result >= 0)
792 result = snd_ctl_elem_write(card, file, control);
793 snd_power_unlock(card);
794 if (result >= 0)
795 if (copy_to_user(_control, control, sizeof(*control)))
796 result = -EFAULT;
797 kfree(control);
798 return result;
799 }
800
801 static int snd_ctl_elem_lock(struct snd_ctl_file *file,
802 struct snd_ctl_elem_id __user *_id)
803 {
804 struct snd_card *card = file->card;
805 struct snd_ctl_elem_id id;
806 struct snd_kcontrol *kctl;
807 struct snd_kcontrol_volatile *vd;
808 int result;
809
810 if (copy_from_user(&id, _id, sizeof(id)))
811 return -EFAULT;
812 down_write(&card->controls_rwsem);
813 kctl = snd_ctl_find_id(card, &id);
814 if (kctl == NULL) {
815 result = -ENOENT;
816 } else {
817 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
818 if (vd->owner != NULL)
819 result = -EBUSY;
820 else {
821 vd->owner = file;
822 vd->owner_pid = current->pid;
823 result = 0;
824 }
825 }
826 up_write(&card->controls_rwsem);
827 return result;
828 }
829
830 static int snd_ctl_elem_unlock(struct snd_ctl_file *file,
831 struct snd_ctl_elem_id __user *_id)
832 {
833 struct snd_card *card = file->card;
834 struct snd_ctl_elem_id id;
835 struct snd_kcontrol *kctl;
836 struct snd_kcontrol_volatile *vd;
837 int result;
838
839 if (copy_from_user(&id, _id, sizeof(id)))
840 return -EFAULT;
841 down_write(&card->controls_rwsem);
842 kctl = snd_ctl_find_id(card, &id);
843 if (kctl == NULL) {
844 result = -ENOENT;
845 } else {
846 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
847 if (vd->owner == NULL)
848 result = -EINVAL;
849 else if (vd->owner != file)
850 result = -EPERM;
851 else {
852 vd->owner = NULL;
853 vd->owner_pid = 0;
854 result = 0;
855 }
856 }
857 up_write(&card->controls_rwsem);
858 return result;
859 }
860
861 struct user_element {
862 struct snd_ctl_elem_info info;
863 void *elem_data; /* element data */
864 unsigned long elem_data_size; /* size of element data in bytes */
865 void *tlv_data; /* TLV data */
866 unsigned long tlv_data_size; /* TLV data size */
867 void *priv_data; /* private data (like strings for enumerated type) */
868 unsigned long priv_data_size; /* size of private data in bytes */
869 };
870
871 static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol,
872 struct snd_ctl_elem_info *uinfo)
873 {
874 struct user_element *ue = kcontrol->private_data;
875
876 *uinfo = ue->info;
877 return 0;
878 }
879
880 static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol,
881 struct snd_ctl_elem_value *ucontrol)
882 {
883 struct user_element *ue = kcontrol->private_data;
884
885 memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size);
886 return 0;
887 }
888
889 static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol,
890 struct snd_ctl_elem_value *ucontrol)
891 {
892 int change;
893 struct user_element *ue = kcontrol->private_data;
894
895 change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0;
896 if (change)
897 memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size);
898 return change;
899 }
900
901 static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol,
902 int op_flag,
903 unsigned int size,
904 unsigned int __user *tlv)
905 {
906 struct user_element *ue = kcontrol->private_data;
907 int change = 0;
908 void *new_data;
909
910 if (op_flag > 0) {
911 if (size > 1024 * 128) /* sane value */
912 return -EINVAL;
913
914 new_data = memdup_user(tlv, size);
915 if (IS_ERR(new_data))
916 return PTR_ERR(new_data);
917 change = ue->tlv_data_size != size;
918 if (!change)
919 change = memcmp(ue->tlv_data, new_data, size);
920 kfree(ue->tlv_data);
921 ue->tlv_data = new_data;
922 ue->tlv_data_size = size;
923 } else {
924 if (! ue->tlv_data_size || ! ue->tlv_data)
925 return -ENXIO;
926 if (size < ue->tlv_data_size)
927 return -ENOSPC;
928 if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size))
929 return -EFAULT;
930 }
931 return change;
932 }
933
934 static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol)
935 {
936 struct user_element *ue = kcontrol->private_data;
937 if (ue->tlv_data)
938 kfree(ue->tlv_data);
939 kfree(ue);
940 }
941
942 static int snd_ctl_elem_add(struct snd_ctl_file *file,
943 struct snd_ctl_elem_info *info, int replace)
944 {
945 struct snd_card *card = file->card;
946 struct snd_kcontrol kctl, *_kctl;
947 unsigned int access;
948 long private_size;
949 struct user_element *ue;
950 int idx, err;
951
952 if (card->user_ctl_count >= MAX_USER_CONTROLS)
953 return -ENOMEM;
954 if (info->count > 1024)
955 return -EINVAL;
956 access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
957 (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
958 SNDRV_CTL_ELEM_ACCESS_INACTIVE|
959 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE));
960 info->id.numid = 0;
961 memset(&kctl, 0, sizeof(kctl));
962 down_write(&card->controls_rwsem);
963 _kctl = snd_ctl_find_id(card, &info->id);
964 err = 0;
965 if (_kctl) {
966 if (replace)
967 err = snd_ctl_remove(card, _kctl);
968 else
969 err = -EBUSY;
970 } else {
971 if (replace)
972 err = -ENOENT;
973 }
974 up_write(&card->controls_rwsem);
975 if (err < 0)
976 return err;
977 memcpy(&kctl.id, &info->id, sizeof(info->id));
978 kctl.count = info->owner ? info->owner : 1;
979 access |= SNDRV_CTL_ELEM_ACCESS_USER;
980 kctl.info = snd_ctl_elem_user_info;
981 if (access & SNDRV_CTL_ELEM_ACCESS_READ)
982 kctl.get = snd_ctl_elem_user_get;
983 if (access & SNDRV_CTL_ELEM_ACCESS_WRITE)
984 kctl.put = snd_ctl_elem_user_put;
985 if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) {
986 kctl.tlv.c = snd_ctl_elem_user_tlv;
987 access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
988 }
989 switch (info->type) {
990 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
991 case SNDRV_CTL_ELEM_TYPE_INTEGER:
992 private_size = sizeof(long);
993 if (info->count > 128)
994 return -EINVAL;
995 break;
996 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
997 private_size = sizeof(long long);
998 if (info->count > 64)
999 return -EINVAL;
1000 break;
1001 case SNDRV_CTL_ELEM_TYPE_BYTES:
1002 private_size = sizeof(unsigned char);
1003 if (info->count > 512)
1004 return -EINVAL;
1005 break;
1006 case SNDRV_CTL_ELEM_TYPE_IEC958:
1007 private_size = sizeof(struct snd_aes_iec958);
1008 if (info->count != 1)
1009 return -EINVAL;
1010 break;
1011 default:
1012 return -EINVAL;
1013 }
1014 private_size *= info->count;
1015 ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL);
1016 if (ue == NULL)
1017 return -ENOMEM;
1018 ue->info = *info;
1019 ue->info.access = 0;
1020 ue->elem_data = (char *)ue + sizeof(*ue);
1021 ue->elem_data_size = private_size;
1022 kctl.private_free = snd_ctl_elem_user_free;
1023 _kctl = snd_ctl_new(&kctl, access);
1024 if (_kctl == NULL) {
1025 kfree(ue);
1026 return -ENOMEM;
1027 }
1028 _kctl->private_data = ue;
1029 for (idx = 0; idx < _kctl->count; idx++)
1030 _kctl->vd[idx].owner = file;
1031 err = snd_ctl_add(card, _kctl);
1032 if (err < 0)
1033 return err;
1034
1035 down_write(&card->controls_rwsem);
1036 card->user_ctl_count++;
1037 up_write(&card->controls_rwsem);
1038
1039 return 0;
1040 }
1041
1042 static int snd_ctl_elem_add_user(struct snd_ctl_file *file,
1043 struct snd_ctl_elem_info __user *_info, int replace)
1044 {
1045 struct snd_ctl_elem_info info;
1046 if (copy_from_user(&info, _info, sizeof(info)))
1047 return -EFAULT;
1048 return snd_ctl_elem_add(file, &info, replace);
1049 }
1050
1051 static int snd_ctl_elem_remove(struct snd_ctl_file *file,
1052 struct snd_ctl_elem_id __user *_id)
1053 {
1054 struct snd_ctl_elem_id id;
1055 int err;
1056
1057 if (copy_from_user(&id, _id, sizeof(id)))
1058 return -EFAULT;
1059 err = snd_ctl_remove_unlocked_id(file, &id);
1060 if (! err) {
1061 struct snd_card *card = file->card;
1062 down_write(&card->controls_rwsem);
1063 card->user_ctl_count--;
1064 up_write(&card->controls_rwsem);
1065 }
1066 return err;
1067 }
1068
1069 static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr)
1070 {
1071 int subscribe;
1072 if (get_user(subscribe, ptr))
1073 return -EFAULT;
1074 if (subscribe < 0) {
1075 subscribe = file->subscribed;
1076 if (put_user(subscribe, ptr))
1077 return -EFAULT;
1078 return 0;
1079 }
1080 if (subscribe) {
1081 file->subscribed = 1;
1082 return 0;
1083 } else if (file->subscribed) {
1084 snd_ctl_empty_read_queue(file);
1085 file->subscribed = 0;
1086 }
1087 return 0;
1088 }
1089
1090 static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file,
1091 struct snd_ctl_tlv __user *_tlv,
1092 int op_flag)
1093 {
1094 struct snd_card *card = file->card;
1095 struct snd_ctl_tlv tlv;
1096 struct snd_kcontrol *kctl;
1097 struct snd_kcontrol_volatile *vd;
1098 unsigned int len;
1099 int err = 0;
1100
1101 if (copy_from_user(&tlv, _tlv, sizeof(tlv)))
1102 return -EFAULT;
1103 if (tlv.length < sizeof(unsigned int) * 3)
1104 return -EINVAL;
1105 down_read(&card->controls_rwsem);
1106 kctl = snd_ctl_find_numid(card, tlv.numid);
1107 if (kctl == NULL) {
1108 err = -ENOENT;
1109 goto __kctl_end;
1110 }
1111 if (kctl->tlv.p == NULL) {
1112 err = -ENXIO;
1113 goto __kctl_end;
1114 }
1115 vd = &kctl->vd[tlv.numid - kctl->id.numid];
1116 if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) ||
1117 (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) ||
1118 (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) {
1119 err = -ENXIO;
1120 goto __kctl_end;
1121 }
1122 if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) {
1123 if (file && vd->owner != NULL && vd->owner != file) {
1124 err = -EPERM;
1125 goto __kctl_end;
1126 }
1127 err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv);
1128 if (err > 0) {
1129 up_read(&card->controls_rwsem);
1130 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id);
1131 return 0;
1132 }
1133 } else {
1134 if (op_flag) {
1135 err = -ENXIO;
1136 goto __kctl_end;
1137 }
1138 len = kctl->tlv.p[1] + 2 * sizeof(unsigned int);
1139 if (tlv.length < len) {
1140 err = -ENOMEM;
1141 goto __kctl_end;
1142 }
1143 if (copy_to_user(_tlv->tlv, kctl->tlv.p, len))
1144 err = -EFAULT;
1145 }
1146 __kctl_end:
1147 up_read(&card->controls_rwsem);
1148 return err;
1149 }
1150
1151 static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1152 {
1153 struct snd_ctl_file *ctl;
1154 struct snd_card *card;
1155 struct snd_kctl_ioctl *p;
1156 void __user *argp = (void __user *)arg;
1157 int __user *ip = argp;
1158 int err;
1159
1160 ctl = file->private_data;
1161 card = ctl->card;
1162 if (snd_BUG_ON(!card))
1163 return -ENXIO;
1164 switch (cmd) {
1165 case SNDRV_CTL_IOCTL_PVERSION:
1166 return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0;
1167 case SNDRV_CTL_IOCTL_CARD_INFO:
1168 return snd_ctl_card_info(card, ctl, cmd, argp);
1169 case SNDRV_CTL_IOCTL_ELEM_LIST:
1170 return snd_ctl_elem_list(card, argp);
1171 case SNDRV_CTL_IOCTL_ELEM_INFO:
1172 return snd_ctl_elem_info_user(ctl, argp);
1173 case SNDRV_CTL_IOCTL_ELEM_READ:
1174 return snd_ctl_elem_read_user(card, argp);
1175 case SNDRV_CTL_IOCTL_ELEM_WRITE:
1176 return snd_ctl_elem_write_user(ctl, argp);
1177 case SNDRV_CTL_IOCTL_ELEM_LOCK:
1178 return snd_ctl_elem_lock(ctl, argp);
1179 case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
1180 return snd_ctl_elem_unlock(ctl, argp);
1181 case SNDRV_CTL_IOCTL_ELEM_ADD:
1182 return snd_ctl_elem_add_user(ctl, argp, 0);
1183 case SNDRV_CTL_IOCTL_ELEM_REPLACE:
1184 return snd_ctl_elem_add_user(ctl, argp, 1);
1185 case SNDRV_CTL_IOCTL_ELEM_REMOVE:
1186 return snd_ctl_elem_remove(ctl, argp);
1187 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
1188 return snd_ctl_subscribe_events(ctl, ip);
1189 case SNDRV_CTL_IOCTL_TLV_READ:
1190 return snd_ctl_tlv_ioctl(ctl, argp, 0);
1191 case SNDRV_CTL_IOCTL_TLV_WRITE:
1192 return snd_ctl_tlv_ioctl(ctl, argp, 1);
1193 case SNDRV_CTL_IOCTL_TLV_COMMAND:
1194 return snd_ctl_tlv_ioctl(ctl, argp, -1);
1195 case SNDRV_CTL_IOCTL_POWER:
1196 return -ENOPROTOOPT;
1197 case SNDRV_CTL_IOCTL_POWER_STATE:
1198 #ifdef CONFIG_PM
1199 return put_user(card->power_state, ip) ? -EFAULT : 0;
1200 #else
1201 return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0;
1202 #endif
1203 }
1204 down_read(&snd_ioctl_rwsem);
1205 list_for_each_entry(p, &snd_control_ioctls, list) {
1206 err = p->fioctl(card, ctl, cmd, arg);
1207 if (err != -ENOIOCTLCMD) {
1208 up_read(&snd_ioctl_rwsem);
1209 return err;
1210 }
1211 }
1212 up_read(&snd_ioctl_rwsem);
1213 snd_printdd("unknown ioctl = 0x%x\n", cmd);
1214 return -ENOTTY;
1215 }
1216
1217 static ssize_t snd_ctl_read(struct file *file, char __user *buffer,
1218 size_t count, loff_t * offset)
1219 {
1220 struct snd_ctl_file *ctl;
1221 int err = 0;
1222 ssize_t result = 0;
1223
1224 ctl = file->private_data;
1225 if (snd_BUG_ON(!ctl || !ctl->card))
1226 return -ENXIO;
1227 if (!ctl->subscribed)
1228 return -EBADFD;
1229 if (count < sizeof(struct snd_ctl_event))
1230 return -EINVAL;
1231 spin_lock_irq(&ctl->read_lock);
1232 while (count >= sizeof(struct snd_ctl_event)) {
1233 struct snd_ctl_event ev;
1234 struct snd_kctl_event *kev;
1235 while (list_empty(&ctl->events)) {
1236 wait_queue_t wait;
1237 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1238 err = -EAGAIN;
1239 goto __end_lock;
1240 }
1241 init_waitqueue_entry(&wait, current);
1242 add_wait_queue(&ctl->change_sleep, &wait);
1243 set_current_state(TASK_INTERRUPTIBLE);
1244 spin_unlock_irq(&ctl->read_lock);
1245 schedule();
1246 remove_wait_queue(&ctl->change_sleep, &wait);
1247 if (signal_pending(current))
1248 return -ERESTARTSYS;
1249 spin_lock_irq(&ctl->read_lock);
1250 }
1251 kev = snd_kctl_event(ctl->events.next);
1252 ev.type = SNDRV_CTL_EVENT_ELEM;
1253 ev.data.elem.mask = kev->mask;
1254 ev.data.elem.id = kev->id;
1255 list_del(&kev->list);
1256 spin_unlock_irq(&ctl->read_lock);
1257 kfree(kev);
1258 if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) {
1259 err = -EFAULT;
1260 goto __end;
1261 }
1262 spin_lock_irq(&ctl->read_lock);
1263 buffer += sizeof(struct snd_ctl_event);
1264 count -= sizeof(struct snd_ctl_event);
1265 result += sizeof(struct snd_ctl_event);
1266 }
1267 __end_lock:
1268 spin_unlock_irq(&ctl->read_lock);
1269 __end:
1270 return result > 0 ? result : err;
1271 }
1272
1273 static unsigned int snd_ctl_poll(struct file *file, poll_table * wait)
1274 {
1275 unsigned int mask;
1276 struct snd_ctl_file *ctl;
1277
1278 ctl = file->private_data;
1279 if (!ctl->subscribed)
1280 return 0;
1281 poll_wait(file, &ctl->change_sleep, wait);
1282
1283 mask = 0;
1284 if (!list_empty(&ctl->events))
1285 mask |= POLLIN | POLLRDNORM;
1286
1287 return mask;
1288 }
1289
1290 /*
1291 * register the device-specific control-ioctls.
1292 * called from each device manager like pcm.c, hwdep.c, etc.
1293 */
1294 static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists)
1295 {
1296 struct snd_kctl_ioctl *pn;
1297
1298 pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL);
1299 if (pn == NULL)
1300 return -ENOMEM;
1301 pn->fioctl = fcn;
1302 down_write(&snd_ioctl_rwsem);
1303 list_add_tail(&pn->list, lists);
1304 up_write(&snd_ioctl_rwsem);
1305 return 0;
1306 }
1307
1308 int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn)
1309 {
1310 return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls);
1311 }
1312
1313 EXPORT_SYMBOL(snd_ctl_register_ioctl);
1314
1315 #ifdef CONFIG_COMPAT
1316 int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1317 {
1318 return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls);
1319 }
1320
1321 EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
1322 #endif
1323
1324 /*
1325 * de-register the device-specific control-ioctls.
1326 */
1327 static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn,
1328 struct list_head *lists)
1329 {
1330 struct snd_kctl_ioctl *p;
1331
1332 if (snd_BUG_ON(!fcn))
1333 return -EINVAL;
1334 down_write(&snd_ioctl_rwsem);
1335 list_for_each_entry(p, lists, list) {
1336 if (p->fioctl == fcn) {
1337 list_del(&p->list);
1338 up_write(&snd_ioctl_rwsem);
1339 kfree(p);
1340 return 0;
1341 }
1342 }
1343 up_write(&snd_ioctl_rwsem);
1344 snd_BUG();
1345 return -EINVAL;
1346 }
1347
1348 int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn)
1349 {
1350 return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls);
1351 }
1352
1353 EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
1354
1355 #ifdef CONFIG_COMPAT
1356 int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1357 {
1358 return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls);
1359 }
1360
1361 EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
1362 #endif
1363
1364 static int snd_ctl_fasync(int fd, struct file * file, int on)
1365 {
1366 struct snd_ctl_file *ctl;
1367
1368 ctl = file->private_data;
1369 return fasync_helper(fd, file, on, &ctl->fasync);
1370 }
1371
1372 /*
1373 * ioctl32 compat
1374 */
1375 #ifdef CONFIG_COMPAT
1376 #include "control_compat.c"
1377 #else
1378 #define snd_ctl_ioctl_compat NULL
1379 #endif
1380
1381 /*
1382 * INIT PART
1383 */
1384
1385 static const struct file_operations snd_ctl_f_ops =
1386 {
1387 .owner = THIS_MODULE,
1388 .read = snd_ctl_read,
1389 .open = snd_ctl_open,
1390 .release = snd_ctl_release,
1391 .poll = snd_ctl_poll,
1392 .unlocked_ioctl = snd_ctl_ioctl,
1393 .compat_ioctl = snd_ctl_ioctl_compat,
1394 .fasync = snd_ctl_fasync,
1395 };
1396
1397 /*
1398 * registration of the control device
1399 */
1400 static int snd_ctl_dev_register(struct snd_device *device)
1401 {
1402 struct snd_card *card = device->device_data;
1403 int err, cardnum;
1404 char name[16];
1405
1406 if (snd_BUG_ON(!card))
1407 return -ENXIO;
1408 cardnum = card->number;
1409 if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1410 return -ENXIO;
1411 sprintf(name, "controlC%i", cardnum);
1412 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
1413 &snd_ctl_f_ops, card, name)) < 0)
1414 return err;
1415 return 0;
1416 }
1417
1418 /*
1419 * disconnection of the control device
1420 */
1421 static int snd_ctl_dev_disconnect(struct snd_device *device)
1422 {
1423 struct snd_card *card = device->device_data;
1424 struct snd_ctl_file *ctl;
1425 int err, cardnum;
1426
1427 if (snd_BUG_ON(!card))
1428 return -ENXIO;
1429 cardnum = card->number;
1430 if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1431 return -ENXIO;
1432
1433 read_lock(&card->ctl_files_rwlock);
1434 list_for_each_entry(ctl, &card->ctl_files, list) {
1435 wake_up(&ctl->change_sleep);
1436 kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);
1437 }
1438 read_unlock(&card->ctl_files_rwlock);
1439
1440 if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL,
1441 card, -1)) < 0)
1442 return err;
1443 return 0;
1444 }
1445
1446 /*
1447 * free all controls
1448 */
1449 static int snd_ctl_dev_free(struct snd_device *device)
1450 {
1451 struct snd_card *card = device->device_data;
1452 struct snd_kcontrol *control;
1453
1454 down_write(&card->controls_rwsem);
1455 while (!list_empty(&card->controls)) {
1456 control = snd_kcontrol(card->controls.next);
1457 snd_ctl_remove(card, control);
1458 }
1459 up_write(&card->controls_rwsem);
1460 return 0;
1461 }
1462
1463 /*
1464 * create control core:
1465 * called from init.c
1466 */
1467 int snd_ctl_create(struct snd_card *card)
1468 {
1469 static struct snd_device_ops ops = {
1470 .dev_free = snd_ctl_dev_free,
1471 .dev_register = snd_ctl_dev_register,
1472 .dev_disconnect = snd_ctl_dev_disconnect,
1473 };
1474
1475 if (snd_BUG_ON(!card))
1476 return -ENXIO;
1477 return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);
1478 }
1479
1480 /*
1481 * Frequently used control callbacks
1482 */
1483 int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
1484 struct snd_ctl_elem_info *uinfo)
1485 {
1486 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1487 uinfo->count = 1;
1488 uinfo->value.integer.min = 0;
1489 uinfo->value.integer.max = 1;
1490 return 0;
1491 }
1492
1493 EXPORT_SYMBOL(snd_ctl_boolean_mono_info);
1494
1495 int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
1496 struct snd_ctl_elem_info *uinfo)
1497 {
1498 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1499 uinfo->count = 2;
1500 uinfo->value.integer.min = 0;
1501 uinfo->value.integer.max = 1;
1502 return 0;
1503 }
1504
1505 EXPORT_SYMBOL(snd_ctl_boolean_stereo_info);
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