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Merge branch 'for-33' of git://repo.or.cz/linux-kbuild
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / sound / core / control.c
blob268ab7471224a5e42fe4f448df75c7ad4ad7094e
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 = get_pid(task_pid(current));
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 put_pid(ctl->pid);
129 kfree(ctl);
130 module_put(card->module);
131 snd_card_file_remove(card, file);
132 return 0;
133 }
134
135 void snd_ctl_notify(struct snd_card *card, unsigned int mask,
136 struct snd_ctl_elem_id *id)
137 {
138 unsigned long flags;
139 struct snd_ctl_file *ctl;
140 struct snd_kctl_event *ev;
141
142 if (snd_BUG_ON(!card || !id))
143 return;
144 read_lock(&card->ctl_files_rwlock);
145 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
146 card->mixer_oss_change_count++;
147 #endif
148 list_for_each_entry(ctl, &card->ctl_files, list) {
149 if (!ctl->subscribed)
150 continue;
151 spin_lock_irqsave(&ctl->read_lock, flags);
152 list_for_each_entry(ev, &ctl->events, list) {
153 if (ev->id.numid == id->numid) {
154 ev->mask |= mask;
155 goto _found;
156 }
157 }
158 ev = kzalloc(sizeof(*ev), GFP_ATOMIC);
159 if (ev) {
160 ev->id = *id;
161 ev->mask = mask;
162 list_add_tail(&ev->list, &ctl->events);
163 } else {
164 snd_printk(KERN_ERR "No memory available to allocate event\n");
165 }
166 _found:
167 wake_up(&ctl->change_sleep);
168 spin_unlock_irqrestore(&ctl->read_lock, flags);
169 kill_fasync(&ctl->fasync, SIGIO, POLL_IN);
170 }
171 read_unlock(&card->ctl_files_rwlock);
172 }
173
174 EXPORT_SYMBOL(snd_ctl_notify);
175
176 /**
177 * snd_ctl_new - create a control instance from the template
178 * @control: the control template
179 * @access: the default control access
180 *
181 * Allocates a new struct snd_kcontrol instance and copies the given template
182 * to the new instance. It does not copy volatile data (access).
183 *
184 * Returns the pointer of the new instance, or NULL on failure.
185 */
186 static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control,
187 unsigned int access)
188 {
189 struct snd_kcontrol *kctl;
190 unsigned int idx;
191
192 if (snd_BUG_ON(!control || !control->count))
193 return NULL;
194 kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL);
195 if (kctl == NULL) {
196 snd_printk(KERN_ERR "Cannot allocate control instance\n");
197 return NULL;
198 }
199 *kctl = *control;
200 for (idx = 0; idx < kctl->count; idx++)
201 kctl->vd[idx].access = access;
202 return kctl;
203 }
204
205 /**
206 * snd_ctl_new1 - create a control instance from the template
207 * @ncontrol: the initialization record
208 * @private_data: the private data to set
209 *
210 * Allocates a new struct snd_kcontrol instance and initialize from the given
211 * template. When the access field of ncontrol is 0, it's assumed as
212 * READWRITE access. When the count field is 0, it's assumes as one.
213 *
214 * Returns the pointer of the newly generated instance, or NULL on failure.
215 */
216 struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol,
217 void *private_data)
218 {
219 struct snd_kcontrol kctl;
220 unsigned int access;
221
222 if (snd_BUG_ON(!ncontrol || !ncontrol->info))
223 return NULL;
224 memset(&kctl, 0, sizeof(kctl));
225 kctl.id.iface = ncontrol->iface;
226 kctl.id.device = ncontrol->device;
227 kctl.id.subdevice = ncontrol->subdevice;
228 if (ncontrol->name) {
229 strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name));
230 if (strcmp(ncontrol->name, kctl.id.name) != 0)
231 snd_printk(KERN_WARNING
232 "Control name '%s' truncated to '%s'\n",
233 ncontrol->name, kctl.id.name);
234 }
235 kctl.id.index = ncontrol->index;
236 kctl.count = ncontrol->count ? ncontrol->count : 1;
237 access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
238 (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
239 SNDRV_CTL_ELEM_ACCESS_INACTIVE|
240 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE|
241 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK));
242 kctl.info = ncontrol->info;
243 kctl.get = ncontrol->get;
244 kctl.put = ncontrol->put;
245 kctl.tlv.p = ncontrol->tlv.p;
246 kctl.private_value = ncontrol->private_value;
247 kctl.private_data = private_data;
248 return snd_ctl_new(&kctl, access);
249 }
250
251 EXPORT_SYMBOL(snd_ctl_new1);
252
253 /**
254 * snd_ctl_free_one - release the control instance
255 * @kcontrol: the control instance
256 *
257 * Releases the control instance created via snd_ctl_new()
258 * or snd_ctl_new1().
259 * Don't call this after the control was added to the card.
260 */
261 void snd_ctl_free_one(struct snd_kcontrol *kcontrol)
262 {
263 if (kcontrol) {
264 if (kcontrol->private_free)
265 kcontrol->private_free(kcontrol);
266 kfree(kcontrol);
267 }
268 }
269
270 EXPORT_SYMBOL(snd_ctl_free_one);
271
272 static unsigned int snd_ctl_hole_check(struct snd_card *card,
273 unsigned int count)
274 {
275 struct snd_kcontrol *kctl;
276
277 list_for_each_entry(kctl, &card->controls, list) {
278 if ((kctl->id.numid <= card->last_numid &&
279 kctl->id.numid + kctl->count > card->last_numid) ||
280 (kctl->id.numid <= card->last_numid + count - 1 &&
281 kctl->id.numid + kctl->count > card->last_numid + count - 1))
282 return card->last_numid = kctl->id.numid + kctl->count - 1;
283 }
284 return card->last_numid;
285 }
286
287 static int snd_ctl_find_hole(struct snd_card *card, unsigned int count)
288 {
289 unsigned int last_numid, iter = 100000;
290
291 last_numid = card->last_numid;
292 while (last_numid != snd_ctl_hole_check(card, count)) {
293 if (--iter == 0) {
294 /* this situation is very unlikely */
295 snd_printk(KERN_ERR "unable to allocate new control numid\n");
296 return -ENOMEM;
297 }
298 last_numid = card->last_numid;
299 }
300 return 0;
301 }
302
303 /**
304 * snd_ctl_add - add the control instance to the card
305 * @card: the card instance
306 * @kcontrol: the control instance to add
307 *
308 * Adds the control instance created via snd_ctl_new() or
309 * snd_ctl_new1() to the given card. Assigns also an unique
310 * numid used for fast search.
311 *
312 * Returns zero if successful, or a negative error code on failure.
313 *
314 * It frees automatically the control which cannot be added.
315 */
316 int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
317 {
318 struct snd_ctl_elem_id id;
319 unsigned int idx;
320 int err = -EINVAL;
321
322 if (! kcontrol)
323 return err;
324 if (snd_BUG_ON(!card || !kcontrol->info))
325 goto error;
326 id = kcontrol->id;
327 down_write(&card->controls_rwsem);
328 if (snd_ctl_find_id(card, &id)) {
329 up_write(&card->controls_rwsem);
330 snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n",
331 id.iface,
332 id.device,
333 id.subdevice,
334 id.name,
335 id.index);
336 err = -EBUSY;
337 goto error;
338 }
339 if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
340 up_write(&card->controls_rwsem);
341 err = -ENOMEM;
342 goto error;
343 }
344 list_add_tail(&kcontrol->list, &card->controls);
345 card->controls_count += kcontrol->count;
346 kcontrol->id.numid = card->last_numid + 1;
347 card->last_numid += kcontrol->count;
348 up_write(&card->controls_rwsem);
349 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
350 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
351 return 0;
352
353 error:
354 snd_ctl_free_one(kcontrol);
355 return err;
356 }
357
358 EXPORT_SYMBOL(snd_ctl_add);
359
360 /**
361 * snd_ctl_remove - remove the control from the card and release it
362 * @card: the card instance
363 * @kcontrol: the control instance to remove
364 *
365 * Removes the control from the card and then releases the instance.
366 * You don't need to call snd_ctl_free_one(). You must be in
367 * the write lock - down_write(&card->controls_rwsem).
368 *
369 * Returns 0 if successful, or a negative error code on failure.
370 */
371 int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol)
372 {
373 struct snd_ctl_elem_id id;
374 unsigned int idx;
375
376 if (snd_BUG_ON(!card || !kcontrol))
377 return -EINVAL;
378 list_del(&kcontrol->list);
379 card->controls_count -= kcontrol->count;
380 id = kcontrol->id;
381 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
382 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id);
383 snd_ctl_free_one(kcontrol);
384 return 0;
385 }
386
387 EXPORT_SYMBOL(snd_ctl_remove);
388
389 /**
390 * snd_ctl_remove_id - remove the control of the given id and release it
391 * @card: the card instance
392 * @id: the control id to remove
393 *
394 * Finds the control instance with the given id, removes it from the
395 * card list and releases it.
396 *
397 * Returns 0 if successful, or a negative error code on failure.
398 */
399 int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id)
400 {
401 struct snd_kcontrol *kctl;
402 int ret;
403
404 down_write(&card->controls_rwsem);
405 kctl = snd_ctl_find_id(card, id);
406 if (kctl == NULL) {
407 up_write(&card->controls_rwsem);
408 return -ENOENT;
409 }
410 ret = snd_ctl_remove(card, kctl);
411 up_write(&card->controls_rwsem);
412 return ret;
413 }
414
415 EXPORT_SYMBOL(snd_ctl_remove_id);
416
417 /**
418 * snd_ctl_remove_user_ctl - remove and release the unlocked user control
419 * @file: active control handle
420 * @id: the control id to remove
421 *
422 * Finds the control instance with the given id, removes it from the
423 * card list and releases it.
424 *
425 * Returns 0 if successful, or a negative error code on failure.
426 */
427 static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file,
428 struct snd_ctl_elem_id *id)
429 {
430 struct snd_card *card = file->card;
431 struct snd_kcontrol *kctl;
432 int idx, ret;
433
434 down_write(&card->controls_rwsem);
435 kctl = snd_ctl_find_id(card, id);
436 if (kctl == NULL) {
437 ret = -ENOENT;
438 goto error;
439 }
440 if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) {
441 ret = -EINVAL;
442 goto error;
443 }
444 for (idx = 0; idx < kctl->count; idx++)
445 if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {
446 ret = -EBUSY;
447 goto error;
448 }
449 ret = snd_ctl_remove(card, kctl);
450 if (ret < 0)
451 goto error;
452 card->user_ctl_count--;
453 error:
454 up_write(&card->controls_rwsem);
455 return ret;
456 }
457
458 /**
459 * snd_ctl_rename_id - replace the id of a control on the card
460 * @card: the card instance
461 * @src_id: the old id
462 * @dst_id: the new id
463 *
464 * Finds the control with the old id from the card, and replaces the
465 * id with the new one.
466 *
467 * Returns zero if successful, or a negative error code on failure.
468 */
469 int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id,
470 struct snd_ctl_elem_id *dst_id)
471 {
472 struct snd_kcontrol *kctl;
473
474 down_write(&card->controls_rwsem);
475 kctl = snd_ctl_find_id(card, src_id);
476 if (kctl == NULL) {
477 up_write(&card->controls_rwsem);
478 return -ENOENT;
479 }
480 kctl->id = *dst_id;
481 kctl->id.numid = card->last_numid + 1;
482 card->last_numid += kctl->count;
483 up_write(&card->controls_rwsem);
484 return 0;
485 }
486
487 EXPORT_SYMBOL(snd_ctl_rename_id);
488
489 /**
490 * snd_ctl_find_numid - find the control instance with the given number-id
491 * @card: the card instance
492 * @numid: the number-id to search
493 *
494 * Finds the control instance with the given number-id from the card.
495 *
496 * Returns the pointer of the instance if found, or NULL if not.
497 *
498 * The caller must down card->controls_rwsem before calling this function
499 * (if the race condition can happen).
500 */
501 struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid)
502 {
503 struct snd_kcontrol *kctl;
504
505 if (snd_BUG_ON(!card || !numid))
506 return NULL;
507 list_for_each_entry(kctl, &card->controls, list) {
508 if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid)
509 return kctl;
510 }
511 return NULL;
512 }
513
514 EXPORT_SYMBOL(snd_ctl_find_numid);
515
516 /**
517 * snd_ctl_find_id - find the control instance with the given id
518 * @card: the card instance
519 * @id: the id to search
520 *
521 * Finds the control instance with the given id from the card.
522 *
523 * Returns the pointer of the instance if found, or NULL if not.
524 *
525 * The caller must down card->controls_rwsem before calling this function
526 * (if the race condition can happen).
527 */
528 struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card,
529 struct snd_ctl_elem_id *id)
530 {
531 struct snd_kcontrol *kctl;
532
533 if (snd_BUG_ON(!card || !id))
534 return NULL;
535 if (id->numid != 0)
536 return snd_ctl_find_numid(card, id->numid);
537 list_for_each_entry(kctl, &card->controls, list) {
538 if (kctl->id.iface != id->iface)
539 continue;
540 if (kctl->id.device != id->device)
541 continue;
542 if (kctl->id.subdevice != id->subdevice)
543 continue;
544 if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name)))
545 continue;
546 if (kctl->id.index > id->index)
547 continue;
548 if (kctl->id.index + kctl->count <= id->index)
549 continue;
550 return kctl;
551 }
552 return NULL;
553 }
554
555 EXPORT_SYMBOL(snd_ctl_find_id);
556
557 static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,
558 unsigned int cmd, void __user *arg)
559 {
560 struct snd_ctl_card_info *info;
561
562 info = kzalloc(sizeof(*info), GFP_KERNEL);
563 if (! info)
564 return -ENOMEM;
565 down_read(&snd_ioctl_rwsem);
566 info->card = card->number;
567 strlcpy(info->id, card->id, sizeof(info->id));
568 strlcpy(info->driver, card->driver, sizeof(info->driver));
569 strlcpy(info->name, card->shortname, sizeof(info->name));
570 strlcpy(info->longname, card->longname, sizeof(info->longname));
571 strlcpy(info->mixername, card->mixername, sizeof(info->mixername));
572 strlcpy(info->components, card->components, sizeof(info->components));
573 up_read(&snd_ioctl_rwsem);
574 if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) {
575 kfree(info);
576 return -EFAULT;
577 }
578 kfree(info);
579 return 0;
580 }
581
582 static int snd_ctl_elem_list(struct snd_card *card,
583 struct snd_ctl_elem_list __user *_list)
584 {
585 struct list_head *plist;
586 struct snd_ctl_elem_list list;
587 struct snd_kcontrol *kctl;
588 struct snd_ctl_elem_id *dst, *id;
589 unsigned int offset, space, first, jidx;
590
591 if (copy_from_user(&list, _list, sizeof(list)))
592 return -EFAULT;
593 offset = list.offset;
594 space = list.space;
595 first = 0;
596 /* try limit maximum space */
597 if (space > 16384)
598 return -ENOMEM;
599 if (space > 0) {
600 /* allocate temporary buffer for atomic operation */
601 dst = vmalloc(space * sizeof(struct snd_ctl_elem_id));
602 if (dst == NULL)
603 return -ENOMEM;
604 down_read(&card->controls_rwsem);
605 list.count = card->controls_count;
606 plist = card->controls.next;
607 while (plist != &card->controls) {
608 if (offset == 0)
609 break;
610 kctl = snd_kcontrol(plist);
611 if (offset < kctl->count)
612 break;
613 offset -= kctl->count;
614 plist = plist->next;
615 }
616 list.used = 0;
617 id = dst;
618 while (space > 0 && plist != &card->controls) {
619 kctl = snd_kcontrol(plist);
620 for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) {
621 snd_ctl_build_ioff(id, kctl, jidx);
622 id++;
623 space--;
624 list.used++;
625 }
626 plist = plist->next;
627 offset = 0;
628 }
629 up_read(&card->controls_rwsem);
630 if (list.used > 0 &&
631 copy_to_user(list.pids, dst,
632 list.used * sizeof(struct snd_ctl_elem_id))) {
633 vfree(dst);
634 return -EFAULT;
635 }
636 vfree(dst);
637 } else {
638 down_read(&card->controls_rwsem);
639 list.count = card->controls_count;
640 up_read(&card->controls_rwsem);
641 }
642 if (copy_to_user(_list, &list, sizeof(list)))
643 return -EFAULT;
644 return 0;
645 }
646
647 static int snd_ctl_elem_info(struct snd_ctl_file *ctl,
648 struct snd_ctl_elem_info *info)
649 {
650 struct snd_card *card = ctl->card;
651 struct snd_kcontrol *kctl;
652 struct snd_kcontrol_volatile *vd;
653 unsigned int index_offset;
654 int result;
655
656 down_read(&card->controls_rwsem);
657 kctl = snd_ctl_find_id(card, &info->id);
658 if (kctl == NULL) {
659 up_read(&card->controls_rwsem);
660 return -ENOENT;
661 }
662 #ifdef CONFIG_SND_DEBUG
663 info->access = 0;
664 #endif
665 result = kctl->info(kctl, info);
666 if (result >= 0) {
667 snd_BUG_ON(info->access);
668 index_offset = snd_ctl_get_ioff(kctl, &info->id);
669 vd = &kctl->vd[index_offset];
670 snd_ctl_build_ioff(&info->id, kctl, index_offset);
671 info->access = vd->access;
672 if (vd->owner) {
673 info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK;
674 if (vd->owner == ctl)
675 info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER;
676 info->owner = pid_vnr(vd->owner->pid);
677 } else {
678 info->owner = -1;
679 }
680 }
681 up_read(&card->controls_rwsem);
682 return result;
683 }
684
685 static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,
686 struct snd_ctl_elem_info __user *_info)
687 {
688 struct snd_ctl_elem_info info;
689 int result;
690
691 if (copy_from_user(&info, _info, sizeof(info)))
692 return -EFAULT;
693 snd_power_lock(ctl->card);
694 result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
695 if (result >= 0)
696 result = snd_ctl_elem_info(ctl, &info);
697 snd_power_unlock(ctl->card);
698 if (result >= 0)
699 if (copy_to_user(_info, &info, sizeof(info)))
700 return -EFAULT;
701 return result;
702 }
703
704 static int snd_ctl_elem_read(struct snd_card *card,
705 struct snd_ctl_elem_value *control)
706 {
707 struct snd_kcontrol *kctl;
708 struct snd_kcontrol_volatile *vd;
709 unsigned int index_offset;
710 int result;
711
712 down_read(&card->controls_rwsem);
713 kctl = snd_ctl_find_id(card, &control->id);
714 if (kctl == NULL) {
715 result = -ENOENT;
716 } else {
717 index_offset = snd_ctl_get_ioff(kctl, &control->id);
718 vd = &kctl->vd[index_offset];
719 if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) &&
720 kctl->get != NULL) {
721 snd_ctl_build_ioff(&control->id, kctl, index_offset);
722 result = kctl->get(kctl, control);
723 } else
724 result = -EPERM;
725 }
726 up_read(&card->controls_rwsem);
727 return result;
728 }
729
730 static int snd_ctl_elem_read_user(struct snd_card *card,
731 struct snd_ctl_elem_value __user *_control)
732 {
733 struct snd_ctl_elem_value *control;
734 int result;
735
736 control = memdup_user(_control, sizeof(*control));
737 if (IS_ERR(control))
738 return PTR_ERR(control);
739
740 snd_power_lock(card);
741 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
742 if (result >= 0)
743 result = snd_ctl_elem_read(card, control);
744 snd_power_unlock(card);
745 if (result >= 0)
746 if (copy_to_user(_control, control, sizeof(*control)))
747 result = -EFAULT;
748 kfree(control);
749 return result;
750 }
751
752 static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file,
753 struct snd_ctl_elem_value *control)
754 {
755 struct snd_kcontrol *kctl;
756 struct snd_kcontrol_volatile *vd;
757 unsigned int index_offset;
758 int result;
759
760 down_read(&card->controls_rwsem);
761 kctl = snd_ctl_find_id(card, &control->id);
762 if (kctl == NULL) {
763 result = -ENOENT;
764 } else {
765 index_offset = snd_ctl_get_ioff(kctl, &control->id);
766 vd = &kctl->vd[index_offset];
767 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) ||
768 kctl->put == NULL ||
769 (file && vd->owner && vd->owner != file)) {
770 result = -EPERM;
771 } else {
772 snd_ctl_build_ioff(&control->id, kctl, index_offset);
773 result = kctl->put(kctl, control);
774 }
775 if (result > 0) {
776 up_read(&card->controls_rwsem);
777 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
778 &control->id);
779 return 0;
780 }
781 }
782 up_read(&card->controls_rwsem);
783 return result;
784 }
785
786 static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
787 struct snd_ctl_elem_value __user *_control)
788 {
789 struct snd_ctl_elem_value *control;
790 struct snd_card *card;
791 int result;
792
793 control = memdup_user(_control, sizeof(*control));
794 if (IS_ERR(control))
795 return PTR_ERR(control);
796
797 card = file->card;
798 snd_power_lock(card);
799 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
800 if (result >= 0)
801 result = snd_ctl_elem_write(card, file, control);
802 snd_power_unlock(card);
803 if (result >= 0)
804 if (copy_to_user(_control, control, sizeof(*control)))
805 result = -EFAULT;
806 kfree(control);
807 return result;
808 }
809
810 static int snd_ctl_elem_lock(struct snd_ctl_file *file,
811 struct snd_ctl_elem_id __user *_id)
812 {
813 struct snd_card *card = file->card;
814 struct snd_ctl_elem_id id;
815 struct snd_kcontrol *kctl;
816 struct snd_kcontrol_volatile *vd;
817 int result;
818
819 if (copy_from_user(&id, _id, sizeof(id)))
820 return -EFAULT;
821 down_write(&card->controls_rwsem);
822 kctl = snd_ctl_find_id(card, &id);
823 if (kctl == NULL) {
824 result = -ENOENT;
825 } else {
826 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
827 if (vd->owner != NULL)
828 result = -EBUSY;
829 else {
830 vd->owner = file;
831 result = 0;
832 }
833 }
834 up_write(&card->controls_rwsem);
835 return result;
836 }
837
838 static int snd_ctl_elem_unlock(struct snd_ctl_file *file,
839 struct snd_ctl_elem_id __user *_id)
840 {
841 struct snd_card *card = file->card;
842 struct snd_ctl_elem_id id;
843 struct snd_kcontrol *kctl;
844 struct snd_kcontrol_volatile *vd;
845 int result;
846
847 if (copy_from_user(&id, _id, sizeof(id)))
848 return -EFAULT;
849 down_write(&card->controls_rwsem);
850 kctl = snd_ctl_find_id(card, &id);
851 if (kctl == NULL) {
852 result = -ENOENT;
853 } else {
854 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
855 if (vd->owner == NULL)
856 result = -EINVAL;
857 else if (vd->owner != file)
858 result = -EPERM;
859 else {
860 vd->owner = NULL;
861 result = 0;
862 }
863 }
864 up_write(&card->controls_rwsem);
865 return result;
866 }
867
868 struct user_element {
869 struct snd_ctl_elem_info info;
870 void *elem_data; /* element data */
871 unsigned long elem_data_size; /* size of element data in bytes */
872 void *tlv_data; /* TLV data */
873 unsigned long tlv_data_size; /* TLV data size */
874 void *priv_data; /* private data (like strings for enumerated type) */
875 unsigned long priv_data_size; /* size of private data in bytes */
876 };
877
878 static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol,
879 struct snd_ctl_elem_info *uinfo)
880 {
881 struct user_element *ue = kcontrol->private_data;
882
883 *uinfo = ue->info;
884 return 0;
885 }
886
887 static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol,
888 struct snd_ctl_elem_value *ucontrol)
889 {
890 struct user_element *ue = kcontrol->private_data;
891
892 memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size);
893 return 0;
894 }
895
896 static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol,
897 struct snd_ctl_elem_value *ucontrol)
898 {
899 int change;
900 struct user_element *ue = kcontrol->private_data;
901
902 change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0;
903 if (change)
904 memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size);
905 return change;
906 }
907
908 static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol,
909 int op_flag,
910 unsigned int size,
911 unsigned int __user *tlv)
912 {
913 struct user_element *ue = kcontrol->private_data;
914 int change = 0;
915 void *new_data;
916
917 if (op_flag > 0) {
918 if (size > 1024 * 128) /* sane value */
919 return -EINVAL;
920
921 new_data = memdup_user(tlv, size);
922 if (IS_ERR(new_data))
923 return PTR_ERR(new_data);
924 change = ue->tlv_data_size != size;
925 if (!change)
926 change = memcmp(ue->tlv_data, new_data, size);
927 kfree(ue->tlv_data);
928 ue->tlv_data = new_data;
929 ue->tlv_data_size = size;
930 } else {
931 if (! ue->tlv_data_size || ! ue->tlv_data)
932 return -ENXIO;
933 if (size < ue->tlv_data_size)
934 return -ENOSPC;
935 if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size))
936 return -EFAULT;
937 }
938 return change;
939 }
940
941 static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol)
942 {
943 struct user_element *ue = kcontrol->private_data;
944 if (ue->tlv_data)
945 kfree(ue->tlv_data);
946 kfree(ue);
947 }
948
949 static int snd_ctl_elem_add(struct snd_ctl_file *file,
950 struct snd_ctl_elem_info *info, int replace)
951 {
952 struct snd_card *card = file->card;
953 struct snd_kcontrol kctl, *_kctl;
954 unsigned int access;
955 long private_size;
956 struct user_element *ue;
957 int idx, err;
958
959 if (card->user_ctl_count >= MAX_USER_CONTROLS)
960 return -ENOMEM;
961 if (info->count < 1)
962 return -EINVAL;
963 access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
964 (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
965 SNDRV_CTL_ELEM_ACCESS_INACTIVE|
966 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE));
967 info->id.numid = 0;
968 memset(&kctl, 0, sizeof(kctl));
969 down_write(&card->controls_rwsem);
970 _kctl = snd_ctl_find_id(card, &info->id);
971 err = 0;
972 if (_kctl) {
973 if (replace)
974 err = snd_ctl_remove(card, _kctl);
975 else
976 err = -EBUSY;
977 } else {
978 if (replace)
979 err = -ENOENT;
980 }
981 up_write(&card->controls_rwsem);
982 if (err < 0)
983 return err;
984 memcpy(&kctl.id, &info->id, sizeof(info->id));
985 kctl.count = info->owner ? info->owner : 1;
986 access |= SNDRV_CTL_ELEM_ACCESS_USER;
987 kctl.info = snd_ctl_elem_user_info;
988 if (access & SNDRV_CTL_ELEM_ACCESS_READ)
989 kctl.get = snd_ctl_elem_user_get;
990 if (access & SNDRV_CTL_ELEM_ACCESS_WRITE)
991 kctl.put = snd_ctl_elem_user_put;
992 if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) {
993 kctl.tlv.c = snd_ctl_elem_user_tlv;
994 access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
995 }
996 switch (info->type) {
997 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
998 case SNDRV_CTL_ELEM_TYPE_INTEGER:
999 private_size = sizeof(long);
1000 if (info->count > 128)
1001 return -EINVAL;
1002 break;
1003 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
1004 private_size = sizeof(long long);
1005 if (info->count > 64)
1006 return -EINVAL;
1007 break;
1008 case SNDRV_CTL_ELEM_TYPE_BYTES:
1009 private_size = sizeof(unsigned char);
1010 if (info->count > 512)
1011 return -EINVAL;
1012 break;
1013 case SNDRV_CTL_ELEM_TYPE_IEC958:
1014 private_size = sizeof(struct snd_aes_iec958);
1015 if (info->count != 1)
1016 return -EINVAL;
1017 break;
1018 default:
1019 return -EINVAL;
1020 }
1021 private_size *= info->count;
1022 ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL);
1023 if (ue == NULL)
1024 return -ENOMEM;
1025 ue->info = *info;
1026 ue->info.access = 0;
1027 ue->elem_data = (char *)ue + sizeof(*ue);
1028 ue->elem_data_size = private_size;
1029 kctl.private_free = snd_ctl_elem_user_free;
1030 _kctl = snd_ctl_new(&kctl, access);
1031 if (_kctl == NULL) {
1032 kfree(ue);
1033 return -ENOMEM;
1034 }
1035 _kctl->private_data = ue;
1036 for (idx = 0; idx < _kctl->count; idx++)
1037 _kctl->vd[idx].owner = file;
1038 err = snd_ctl_add(card, _kctl);
1039 if (err < 0)
1040 return err;
1041
1042 down_write(&card->controls_rwsem);
1043 card->user_ctl_count++;
1044 up_write(&card->controls_rwsem);
1045
1046 return 0;
1047 }
1048
1049 static int snd_ctl_elem_add_user(struct snd_ctl_file *file,
1050 struct snd_ctl_elem_info __user *_info, int replace)
1051 {
1052 struct snd_ctl_elem_info info;
1053 if (copy_from_user(&info, _info, sizeof(info)))
1054 return -EFAULT;
1055 return snd_ctl_elem_add(file, &info, replace);
1056 }
1057
1058 static int snd_ctl_elem_remove(struct snd_ctl_file *file,
1059 struct snd_ctl_elem_id __user *_id)
1060 {
1061 struct snd_ctl_elem_id id;
1062
1063 if (copy_from_user(&id, _id, sizeof(id)))
1064 return -EFAULT;
1065 return snd_ctl_remove_user_ctl(file, &id);
1066 }
1067
1068 static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr)
1069 {
1070 int subscribe;
1071 if (get_user(subscribe, ptr))
1072 return -EFAULT;
1073 if (subscribe < 0) {
1074 subscribe = file->subscribed;
1075 if (put_user(subscribe, ptr))
1076 return -EFAULT;
1077 return 0;
1078 }
1079 if (subscribe) {
1080 file->subscribed = 1;
1081 return 0;
1082 } else if (file->subscribed) {
1083 snd_ctl_empty_read_queue(file);
1084 file->subscribed = 0;
1085 }
1086 return 0;
1087 }
1088
1089 static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file,
1090 struct snd_ctl_tlv __user *_tlv,
1091 int op_flag)
1092 {
1093 struct snd_card *card = file->card;
1094 struct snd_ctl_tlv tlv;
1095 struct snd_kcontrol *kctl;
1096 struct snd_kcontrol_volatile *vd;
1097 unsigned int len;
1098 int err = 0;
1099
1100 if (copy_from_user(&tlv, _tlv, sizeof(tlv)))
1101 return -EFAULT;
1102 if (tlv.length < sizeof(unsigned int) * 3)
1103 return -EINVAL;
1104 down_read(&card->controls_rwsem);
1105 kctl = snd_ctl_find_numid(card, tlv.numid);
1106 if (kctl == NULL) {
1107 err = -ENOENT;
1108 goto __kctl_end;
1109 }
1110 if (kctl->tlv.p == NULL) {
1111 err = -ENXIO;
1112 goto __kctl_end;
1113 }
1114 vd = &kctl->vd[tlv.numid - kctl->id.numid];
1115 if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) ||
1116 (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) ||
1117 (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) {
1118 err = -ENXIO;
1119 goto __kctl_end;
1120 }
1121 if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) {
1122 if (vd->owner != NULL && vd->owner != file) {
1123 err = -EPERM;
1124 goto __kctl_end;
1125 }
1126 err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv);
1127 if (err > 0) {
1128 up_read(&card->controls_rwsem);
1129 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id);
1130 return 0;
1131 }
1132 } else {
1133 if (op_flag) {
1134 err = -ENXIO;
1135 goto __kctl_end;
1136 }
1137 len = kctl->tlv.p[1] + 2 * sizeof(unsigned int);
1138 if (tlv.length < len) {
1139 err = -ENOMEM;
1140 goto __kctl_end;
1141 }
1142 if (copy_to_user(_tlv->tlv, kctl->tlv.p, len))
1143 err = -EFAULT;
1144 }
1145 __kctl_end:
1146 up_read(&card->controls_rwsem);
1147 return err;
1148 }
1149
1150 static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1151 {
1152 struct snd_ctl_file *ctl;
1153 struct snd_card *card;
1154 struct snd_kctl_ioctl *p;
1155 void __user *argp = (void __user *)arg;
1156 int __user *ip = argp;
1157 int err;
1158
1159 ctl = file->private_data;
1160 card = ctl->card;
1161 if (snd_BUG_ON(!card))
1162 return -ENXIO;
1163 switch (cmd) {
1164 case SNDRV_CTL_IOCTL_PVERSION:
1165 return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0;
1166 case SNDRV_CTL_IOCTL_CARD_INFO:
1167 return snd_ctl_card_info(card, ctl, cmd, argp);
1168 case SNDRV_CTL_IOCTL_ELEM_LIST:
1169 return snd_ctl_elem_list(card, argp);
1170 case SNDRV_CTL_IOCTL_ELEM_INFO:
1171 return snd_ctl_elem_info_user(ctl, argp);
1172 case SNDRV_CTL_IOCTL_ELEM_READ:
1173 return snd_ctl_elem_read_user(card, argp);
1174 case SNDRV_CTL_IOCTL_ELEM_WRITE:
1175 return snd_ctl_elem_write_user(ctl, argp);
1176 case SNDRV_CTL_IOCTL_ELEM_LOCK:
1177 return snd_ctl_elem_lock(ctl, argp);
1178 case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
1179 return snd_ctl_elem_unlock(ctl, argp);
1180 case SNDRV_CTL_IOCTL_ELEM_ADD:
1181 return snd_ctl_elem_add_user(ctl, argp, 0);
1182 case SNDRV_CTL_IOCTL_ELEM_REPLACE:
1183 return snd_ctl_elem_add_user(ctl, argp, 1);
1184 case SNDRV_CTL_IOCTL_ELEM_REMOVE:
1185 return snd_ctl_elem_remove(ctl, argp);
1186 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
1187 return snd_ctl_subscribe_events(ctl, ip);
1188 case SNDRV_CTL_IOCTL_TLV_READ:
1189 return snd_ctl_tlv_ioctl(ctl, argp, 0);
1190 case SNDRV_CTL_IOCTL_TLV_WRITE:
1191 return snd_ctl_tlv_ioctl(ctl, argp, 1);
1192 case SNDRV_CTL_IOCTL_TLV_COMMAND:
1193 return snd_ctl_tlv_ioctl(ctl, argp, -1);
1194 case SNDRV_CTL_IOCTL_POWER:
1195 return -ENOPROTOOPT;
1196 case SNDRV_CTL_IOCTL_POWER_STATE:
1197 #ifdef CONFIG_PM
1198 return put_user(card->power_state, ip) ? -EFAULT : 0;
1199 #else
1200 return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0;
1201 #endif
1202 }
1203 down_read(&snd_ioctl_rwsem);
1204 list_for_each_entry(p, &snd_control_ioctls, list) {
1205 err = p->fioctl(card, ctl, cmd, arg);
1206 if (err != -ENOIOCTLCMD) {
1207 up_read(&snd_ioctl_rwsem);
1208 return err;
1209 }
1210 }
1211 up_read(&snd_ioctl_rwsem);
1212 snd_printdd("unknown ioctl = 0x%x\n", cmd);
1213 return -ENOTTY;
1214 }
1215
1216 static ssize_t snd_ctl_read(struct file *file, char __user *buffer,
1217 size_t count, loff_t * offset)
1218 {
1219 struct snd_ctl_file *ctl;
1220 int err = 0;
1221 ssize_t result = 0;
1222
1223 ctl = file->private_data;
1224 if (snd_BUG_ON(!ctl || !ctl->card))
1225 return -ENXIO;
1226 if (!ctl->subscribed)
1227 return -EBADFD;
1228 if (count < sizeof(struct snd_ctl_event))
1229 return -EINVAL;
1230 spin_lock_irq(&ctl->read_lock);
1231 while (count >= sizeof(struct snd_ctl_event)) {
1232 struct snd_ctl_event ev;
1233 struct snd_kctl_event *kev;
1234 while (list_empty(&ctl->events)) {
1235 wait_queue_t wait;
1236 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1237 err = -EAGAIN;
1238 goto __end_lock;
1239 }
1240 init_waitqueue_entry(&wait, current);
1241 add_wait_queue(&ctl->change_sleep, &wait);
1242 set_current_state(TASK_INTERRUPTIBLE);
1243 spin_unlock_irq(&ctl->read_lock);
1244 schedule();
1245 remove_wait_queue(&ctl->change_sleep, &wait);
1246 if (signal_pending(current))
1247 return -ERESTARTSYS;
1248 spin_lock_irq(&ctl->read_lock);
1249 }
1250 kev = snd_kctl_event(ctl->events.next);
1251 ev.type = SNDRV_CTL_EVENT_ELEM;
1252 ev.data.elem.mask = kev->mask;
1253 ev.data.elem.id = kev->id;
1254 list_del(&kev->list);
1255 spin_unlock_irq(&ctl->read_lock);
1256 kfree(kev);
1257 if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) {
1258 err = -EFAULT;
1259 goto __end;
1260 }
1261 spin_lock_irq(&ctl->read_lock);
1262 buffer += sizeof(struct snd_ctl_event);
1263 count -= sizeof(struct snd_ctl_event);
1264 result += sizeof(struct snd_ctl_event);
1265 }
1266 __end_lock:
1267 spin_unlock_irq(&ctl->read_lock);
1268 __end:
1269 return result > 0 ? result : err;
1270 }
1271
1272 static unsigned int snd_ctl_poll(struct file *file, poll_table * wait)
1273 {
1274 unsigned int mask;
1275 struct snd_ctl_file *ctl;
1276
1277 ctl = file->private_data;
1278 if (!ctl->subscribed)
1279 return 0;
1280 poll_wait(file, &ctl->change_sleep, wait);
1281
1282 mask = 0;
1283 if (!list_empty(&ctl->events))
1284 mask |= POLLIN | POLLRDNORM;
1285
1286 return mask;
1287 }
1288
1289 /*
1290 * register the device-specific control-ioctls.
1291 * called from each device manager like pcm.c, hwdep.c, etc.
1292 */
1293 static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists)
1294 {
1295 struct snd_kctl_ioctl *pn;
1296
1297 pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL);
1298 if (pn == NULL)
1299 return -ENOMEM;
1300 pn->fioctl = fcn;
1301 down_write(&snd_ioctl_rwsem);
1302 list_add_tail(&pn->list, lists);
1303 up_write(&snd_ioctl_rwsem);
1304 return 0;
1305 }
1306
1307 int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn)
1308 {
1309 return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls);
1310 }
1311
1312 EXPORT_SYMBOL(snd_ctl_register_ioctl);
1313
1314 #ifdef CONFIG_COMPAT
1315 int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1316 {
1317 return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls);
1318 }
1319
1320 EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
1321 #endif
1322
1323 /*
1324 * de-register the device-specific control-ioctls.
1325 */
1326 static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn,
1327 struct list_head *lists)
1328 {
1329 struct snd_kctl_ioctl *p;
1330
1331 if (snd_BUG_ON(!fcn))
1332 return -EINVAL;
1333 down_write(&snd_ioctl_rwsem);
1334 list_for_each_entry(p, lists, list) {
1335 if (p->fioctl == fcn) {
1336 list_del(&p->list);
1337 up_write(&snd_ioctl_rwsem);
1338 kfree(p);
1339 return 0;
1340 }
1341 }
1342 up_write(&snd_ioctl_rwsem);
1343 snd_BUG();
1344 return -EINVAL;
1345 }
1346
1347 int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn)
1348 {
1349 return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls);
1350 }
1351
1352 EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
1353
1354 #ifdef CONFIG_COMPAT
1355 int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1356 {
1357 return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls);
1358 }
1359
1360 EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
1361 #endif
1362
1363 static int snd_ctl_fasync(int fd, struct file * file, int on)
1364 {
1365 struct snd_ctl_file *ctl;
1366
1367 ctl = file->private_data;
1368 return fasync_helper(fd, file, on, &ctl->fasync);
1369 }
1370
1371 /*
1372 * ioctl32 compat
1373 */
1374 #ifdef CONFIG_COMPAT
1375 #include "control_compat.c"
1376 #else
1377 #define snd_ctl_ioctl_compat NULL
1378 #endif
1379
1380 /*
1381 * INIT PART
1382 */
1383
1384 static const struct file_operations snd_ctl_f_ops =
1385 {
1386 .owner = THIS_MODULE,
1387 .read = snd_ctl_read,
1388 .open = snd_ctl_open,
1389 .release = snd_ctl_release,
1390 .poll = snd_ctl_poll,
1391 .unlocked_ioctl = snd_ctl_ioctl,
1392 .compat_ioctl = snd_ctl_ioctl_compat,
1393 .fasync = snd_ctl_fasync,
1394 };
1395
1396 /*
1397 * registration of the control device
1398 */
1399 static int snd_ctl_dev_register(struct snd_device *device)
1400 {
1401 struct snd_card *card = device->device_data;
1402 int err, cardnum;
1403 char name[16];
1404
1405 if (snd_BUG_ON(!card))
1406 return -ENXIO;
1407 cardnum = card->number;
1408 if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1409 return -ENXIO;
1410 sprintf(name, "controlC%i", cardnum);
1411 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
1412 &snd_ctl_f_ops, card, name)) < 0)
1413 return err;
1414 return 0;
1415 }
1416
1417 /*
1418 * disconnection of the control device
1419 */
1420 static int snd_ctl_dev_disconnect(struct snd_device *device)
1421 {
1422 struct snd_card *card = device->device_data;
1423 struct snd_ctl_file *ctl;
1424 int err, cardnum;
1425
1426 if (snd_BUG_ON(!card))
1427 return -ENXIO;
1428 cardnum = card->number;
1429 if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1430 return -ENXIO;
1431
1432 read_lock(&card->ctl_files_rwlock);
1433 list_for_each_entry(ctl, &card->ctl_files, list) {
1434 wake_up(&ctl->change_sleep);
1435 kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);
1436 }
1437 read_unlock(&card->ctl_files_rwlock);
1438
1439 if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL,
1440 card, -1)) < 0)
1441 return err;
1442 return 0;
1443 }
1444
1445 /*
1446 * free all controls
1447 */
1448 static int snd_ctl_dev_free(struct snd_device *device)
1449 {
1450 struct snd_card *card = device->device_data;
1451 struct snd_kcontrol *control;
1452
1453 down_write(&card->controls_rwsem);
1454 while (!list_empty(&card->controls)) {
1455 control = snd_kcontrol(card->controls.next);
1456 snd_ctl_remove(card, control);
1457 }
1458 up_write(&card->controls_rwsem);
1459 return 0;
1460 }
1461
1462 /*
1463 * create control core:
1464 * called from init.c
1465 */
1466 int snd_ctl_create(struct snd_card *card)
1467 {
1468 static struct snd_device_ops ops = {
1469 .dev_free = snd_ctl_dev_free,
1470 .dev_register = snd_ctl_dev_register,
1471 .dev_disconnect = snd_ctl_dev_disconnect,
1472 };
1473
1474 if (snd_BUG_ON(!card))
1475 return -ENXIO;
1476 return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);
1477 }
1478
1479 /*
1480 * Frequently used control callbacks
1481 */
1482 int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
1483 struct snd_ctl_elem_info *uinfo)
1484 {
1485 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1486 uinfo->count = 1;
1487 uinfo->value.integer.min = 0;
1488 uinfo->value.integer.max = 1;
1489 return 0;
1490 }
1491
1492 EXPORT_SYMBOL(snd_ctl_boolean_mono_info);
1493
1494 int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
1495 struct snd_ctl_elem_info *uinfo)
1496 {
1497 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1498 uinfo->count = 2;
1499 uinfo->value.integer.min = 0;
1500 uinfo->value.integer.max = 1;
1501 return 0;
1502 }
1503
1504 EXPORT_SYMBOL(snd_ctl_boolean_stereo_info);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree