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xen: cleancache shim to Xen Transcendent Memory
[linux-2.6/next.git] / sound / core / control.c
bloba08ad57c49b6adf48a6fcc516dd02d62c159f406
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 #define MAX_CONTROL_COUNT 1028
35
36 struct snd_kctl_ioctl {
37 struct list_head list; /* list of all ioctls */
38 snd_kctl_ioctl_func_t fioctl;
39 };
40
41 static DECLARE_RWSEM(snd_ioctl_rwsem);
42 static LIST_HEAD(snd_control_ioctls);
43 #ifdef CONFIG_COMPAT
44 static LIST_HEAD(snd_control_compat_ioctls);
45 #endif
46
47 static int snd_ctl_open(struct inode *inode, struct file *file)
48 {
49 unsigned long flags;
50 struct snd_card *card;
51 struct snd_ctl_file *ctl;
52 int err;
53
54 err = nonseekable_open(inode, file);
55 if (err < 0)
56 return err;
57
58 card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL);
59 if (!card) {
60 err = -ENODEV;
61 goto __error1;
62 }
63 err = snd_card_file_add(card, file);
64 if (err < 0) {
65 err = -ENODEV;
66 goto __error1;
67 }
68 if (!try_module_get(card->module)) {
69 err = -EFAULT;
70 goto __error2;
71 }
72 ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
73 if (ctl == NULL) {
74 err = -ENOMEM;
75 goto __error;
76 }
77 INIT_LIST_HEAD(&ctl->events);
78 init_waitqueue_head(&ctl->change_sleep);
79 spin_lock_init(&ctl->read_lock);
80 ctl->card = card;
81 ctl->prefer_pcm_subdevice = -1;
82 ctl->prefer_rawmidi_subdevice = -1;
83 ctl->pid = get_pid(task_pid(current));
84 file->private_data = ctl;
85 write_lock_irqsave(&card->ctl_files_rwlock, flags);
86 list_add_tail(&ctl->list, &card->ctl_files);
87 write_unlock_irqrestore(&card->ctl_files_rwlock, flags);
88 return 0;
89
90 __error:
91 module_put(card->module);
92 __error2:
93 snd_card_file_remove(card, file);
94 __error1:
95 return err;
96 }
97
98 static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl)
99 {
100 unsigned long flags;
101 struct snd_kctl_event *cread;
102
103 spin_lock_irqsave(&ctl->read_lock, flags);
104 while (!list_empty(&ctl->events)) {
105 cread = snd_kctl_event(ctl->events.next);
106 list_del(&cread->list);
107 kfree(cread);
108 }
109 spin_unlock_irqrestore(&ctl->read_lock, flags);
110 }
111
112 static int snd_ctl_release(struct inode *inode, struct file *file)
113 {
114 unsigned long flags;
115 struct snd_card *card;
116 struct snd_ctl_file *ctl;
117 struct snd_kcontrol *control;
118 unsigned int idx;
119
120 ctl = file->private_data;
121 file->private_data = NULL;
122 card = ctl->card;
123 write_lock_irqsave(&card->ctl_files_rwlock, flags);
124 list_del(&ctl->list);
125 write_unlock_irqrestore(&card->ctl_files_rwlock, flags);
126 down_write(&card->controls_rwsem);
127 list_for_each_entry(control, &card->controls, list)
128 for (idx = 0; idx < control->count; idx++)
129 if (control->vd[idx].owner == ctl)
130 control->vd[idx].owner = NULL;
131 up_write(&card->controls_rwsem);
132 snd_ctl_empty_read_queue(ctl);
133 put_pid(ctl->pid);
134 kfree(ctl);
135 module_put(card->module);
136 snd_card_file_remove(card, file);
137 return 0;
138 }
139
140 void snd_ctl_notify(struct snd_card *card, unsigned int mask,
141 struct snd_ctl_elem_id *id)
142 {
143 unsigned long flags;
144 struct snd_ctl_file *ctl;
145 struct snd_kctl_event *ev;
146
147 if (snd_BUG_ON(!card || !id))
148 return;
149 read_lock(&card->ctl_files_rwlock);
150 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
151 card->mixer_oss_change_count++;
152 #endif
153 list_for_each_entry(ctl, &card->ctl_files, list) {
154 if (!ctl->subscribed)
155 continue;
156 spin_lock_irqsave(&ctl->read_lock, flags);
157 list_for_each_entry(ev, &ctl->events, list) {
158 if (ev->id.numid == id->numid) {
159 ev->mask |= mask;
160 goto _found;
161 }
162 }
163 ev = kzalloc(sizeof(*ev), GFP_ATOMIC);
164 if (ev) {
165 ev->id = *id;
166 ev->mask = mask;
167 list_add_tail(&ev->list, &ctl->events);
168 } else {
169 snd_printk(KERN_ERR "No memory available to allocate event\n");
170 }
171 _found:
172 wake_up(&ctl->change_sleep);
173 spin_unlock_irqrestore(&ctl->read_lock, flags);
174 kill_fasync(&ctl->fasync, SIGIO, POLL_IN);
175 }
176 read_unlock(&card->ctl_files_rwlock);
177 }
178
179 EXPORT_SYMBOL(snd_ctl_notify);
180
181 /**
182 * snd_ctl_new - create a control instance from the template
183 * @control: the control template
184 * @access: the default control access
185 *
186 * Allocates a new struct snd_kcontrol instance and copies the given template
187 * to the new instance. It does not copy volatile data (access).
188 *
189 * Returns the pointer of the new instance, or NULL on failure.
190 */
191 static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control,
192 unsigned int access)
193 {
194 struct snd_kcontrol *kctl;
195 unsigned int idx;
196
197 if (snd_BUG_ON(!control || !control->count))
198 return NULL;
199
200 if (control->count > MAX_CONTROL_COUNT)
201 return NULL;
202
203 kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL);
204 if (kctl == NULL) {
205 snd_printk(KERN_ERR "Cannot allocate control instance\n");
206 return NULL;
207 }
208 *kctl = *control;
209 for (idx = 0; idx < kctl->count; idx++)
210 kctl->vd[idx].access = access;
211 return kctl;
212 }
213
214 /**
215 * snd_ctl_new1 - create a control instance from the template
216 * @ncontrol: the initialization record
217 * @private_data: the private data to set
218 *
219 * Allocates a new struct snd_kcontrol instance and initialize from the given
220 * template. When the access field of ncontrol is 0, it's assumed as
221 * READWRITE access. When the count field is 0, it's assumes as one.
222 *
223 * Returns the pointer of the newly generated instance, or NULL on failure.
224 */
225 struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol,
226 void *private_data)
227 {
228 struct snd_kcontrol kctl;
229 unsigned int access;
230
231 if (snd_BUG_ON(!ncontrol || !ncontrol->info))
232 return NULL;
233 memset(&kctl, 0, sizeof(kctl));
234 kctl.id.iface = ncontrol->iface;
235 kctl.id.device = ncontrol->device;
236 kctl.id.subdevice = ncontrol->subdevice;
237 if (ncontrol->name) {
238 strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name));
239 if (strcmp(ncontrol->name, kctl.id.name) != 0)
240 snd_printk(KERN_WARNING
241 "Control name '%s' truncated to '%s'\n",
242 ncontrol->name, kctl.id.name);
243 }
244 kctl.id.index = ncontrol->index;
245 kctl.count = ncontrol->count ? ncontrol->count : 1;
246 access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
247 (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
248 SNDRV_CTL_ELEM_ACCESS_INACTIVE|
249 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE|
250 SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND|
251 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK));
252 kctl.info = ncontrol->info;
253 kctl.get = ncontrol->get;
254 kctl.put = ncontrol->put;
255 kctl.tlv.p = ncontrol->tlv.p;
256 kctl.private_value = ncontrol->private_value;
257 kctl.private_data = private_data;
258 return snd_ctl_new(&kctl, access);
259 }
260
261 EXPORT_SYMBOL(snd_ctl_new1);
262
263 /**
264 * snd_ctl_free_one - release the control instance
265 * @kcontrol: the control instance
266 *
267 * Releases the control instance created via snd_ctl_new()
268 * or snd_ctl_new1().
269 * Don't call this after the control was added to the card.
270 */
271 void snd_ctl_free_one(struct snd_kcontrol *kcontrol)
272 {
273 if (kcontrol) {
274 if (kcontrol->private_free)
275 kcontrol->private_free(kcontrol);
276 kfree(kcontrol);
277 }
278 }
279
280 EXPORT_SYMBOL(snd_ctl_free_one);
281
282 static bool snd_ctl_remove_numid_conflict(struct snd_card *card,
283 unsigned int count)
284 {
285 struct snd_kcontrol *kctl;
286
287 list_for_each_entry(kctl, &card->controls, list) {
288 if (kctl->id.numid < card->last_numid + 1 + count &&
289 kctl->id.numid + kctl->count > card->last_numid + 1) {
290 card->last_numid = kctl->id.numid + kctl->count - 1;
291 return true;
292 }
293 }
294 return false;
295 }
296
297 static int snd_ctl_find_hole(struct snd_card *card, unsigned int count)
298 {
299 unsigned int iter = 100000;
300
301 while (snd_ctl_remove_numid_conflict(card, count)) {
302 if (--iter == 0) {
303 /* this situation is very unlikely */
304 snd_printk(KERN_ERR "unable to allocate new control numid\n");
305 return -ENOMEM;
306 }
307 }
308 return 0;
309 }
310
311 /**
312 * snd_ctl_add - add the control instance to the card
313 * @card: the card instance
314 * @kcontrol: the control instance to add
315 *
316 * Adds the control instance created via snd_ctl_new() or
317 * snd_ctl_new1() to the given card. Assigns also an unique
318 * numid used for fast search.
319 *
320 * Returns zero if successful, or a negative error code on failure.
321 *
322 * It frees automatically the control which cannot be added.
323 */
324 int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
325 {
326 struct snd_ctl_elem_id id;
327 unsigned int idx;
328 int err = -EINVAL;
329
330 if (! kcontrol)
331 return err;
332 if (snd_BUG_ON(!card || !kcontrol->info))
333 goto error;
334 id = kcontrol->id;
335 down_write(&card->controls_rwsem);
336 if (snd_ctl_find_id(card, &id)) {
337 up_write(&card->controls_rwsem);
338 snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n",
339 id.iface,
340 id.device,
341 id.subdevice,
342 id.name,
343 id.index);
344 err = -EBUSY;
345 goto error;
346 }
347 if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
348 up_write(&card->controls_rwsem);
349 err = -ENOMEM;
350 goto error;
351 }
352 list_add_tail(&kcontrol->list, &card->controls);
353 card->controls_count += kcontrol->count;
354 kcontrol->id.numid = card->last_numid + 1;
355 card->last_numid += kcontrol->count;
356 up_write(&card->controls_rwsem);
357 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
358 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
359 return 0;
360
361 error:
362 snd_ctl_free_one(kcontrol);
363 return err;
364 }
365
366 EXPORT_SYMBOL(snd_ctl_add);
367
368 /**
369 * snd_ctl_remove - remove the control from the card and release it
370 * @card: the card instance
371 * @kcontrol: the control instance to remove
372 *
373 * Removes the control from the card and then releases the instance.
374 * You don't need to call snd_ctl_free_one(). You must be in
375 * the write lock - down_write(&card->controls_rwsem).
376 *
377 * Returns 0 if successful, or a negative error code on failure.
378 */
379 int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol)
380 {
381 struct snd_ctl_elem_id id;
382 unsigned int idx;
383
384 if (snd_BUG_ON(!card || !kcontrol))
385 return -EINVAL;
386 list_del(&kcontrol->list);
387 card->controls_count -= kcontrol->count;
388 id = kcontrol->id;
389 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
390 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id);
391 snd_ctl_free_one(kcontrol);
392 return 0;
393 }
394
395 EXPORT_SYMBOL(snd_ctl_remove);
396
397 /**
398 * snd_ctl_remove_id - remove the control of the given id and release it
399 * @card: the card instance
400 * @id: the control id to remove
401 *
402 * Finds the control instance with the given id, removes it from the
403 * card list and releases it.
404 *
405 * Returns 0 if successful, or a negative error code on failure.
406 */
407 int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id)
408 {
409 struct snd_kcontrol *kctl;
410 int ret;
411
412 down_write(&card->controls_rwsem);
413 kctl = snd_ctl_find_id(card, id);
414 if (kctl == NULL) {
415 up_write(&card->controls_rwsem);
416 return -ENOENT;
417 }
418 ret = snd_ctl_remove(card, kctl);
419 up_write(&card->controls_rwsem);
420 return ret;
421 }
422
423 EXPORT_SYMBOL(snd_ctl_remove_id);
424
425 /**
426 * snd_ctl_remove_user_ctl - remove and release the unlocked user control
427 * @file: active control handle
428 * @id: the control id to remove
429 *
430 * Finds the control instance with the given id, removes it from the
431 * card list and releases it.
432 *
433 * Returns 0 if successful, or a negative error code on failure.
434 */
435 static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file,
436 struct snd_ctl_elem_id *id)
437 {
438 struct snd_card *card = file->card;
439 struct snd_kcontrol *kctl;
440 int idx, ret;
441
442 down_write(&card->controls_rwsem);
443 kctl = snd_ctl_find_id(card, id);
444 if (kctl == NULL) {
445 ret = -ENOENT;
446 goto error;
447 }
448 if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) {
449 ret = -EINVAL;
450 goto error;
451 }
452 for (idx = 0; idx < kctl->count; idx++)
453 if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {
454 ret = -EBUSY;
455 goto error;
456 }
457 ret = snd_ctl_remove(card, kctl);
458 if (ret < 0)
459 goto error;
460 card->user_ctl_count--;
461 error:
462 up_write(&card->controls_rwsem);
463 return ret;
464 }
465
466 /**
467 * snd_ctl_activate_id - activate/inactivate the control of the given id
468 * @card: the card instance
469 * @id: the control id to activate/inactivate
470 * @active: non-zero to activate
471 *
472 * Finds the control instance with the given id, and activate or
473 * inactivate the control together with notification, if changed.
474 *
475 * Returns 0 if unchanged, 1 if changed, or a negative error code on failure.
476 */
477 int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id,
478 int active)
479 {
480 struct snd_kcontrol *kctl;
481 struct snd_kcontrol_volatile *vd;
482 unsigned int index_offset;
483 int ret;
484
485 down_write(&card->controls_rwsem);
486 kctl = snd_ctl_find_id(card, id);
487 if (kctl == NULL) {
488 ret = -ENOENT;
489 goto unlock;
490 }
491 index_offset = snd_ctl_get_ioff(kctl, &kctl->id);
492 vd = &kctl->vd[index_offset];
493 ret = 0;
494 if (active) {
495 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE))
496 goto unlock;
497 vd->access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
498 } else {
499 if (vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)
500 goto unlock;
501 vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
502 }
503 ret = 1;
504 unlock:
505 up_write(&card->controls_rwsem);
506 if (ret > 0)
507 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, id);
508 return ret;
509 }
510 EXPORT_SYMBOL_GPL(snd_ctl_activate_id);
511
512 /**
513 * snd_ctl_rename_id - replace the id of a control on the card
514 * @card: the card instance
515 * @src_id: the old id
516 * @dst_id: the new id
517 *
518 * Finds the control with the old id from the card, and replaces the
519 * id with the new one.
520 *
521 * Returns zero if successful, or a negative error code on failure.
522 */
523 int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id,
524 struct snd_ctl_elem_id *dst_id)
525 {
526 struct snd_kcontrol *kctl;
527
528 down_write(&card->controls_rwsem);
529 kctl = snd_ctl_find_id(card, src_id);
530 if (kctl == NULL) {
531 up_write(&card->controls_rwsem);
532 return -ENOENT;
533 }
534 kctl->id = *dst_id;
535 kctl->id.numid = card->last_numid + 1;
536 card->last_numid += kctl->count;
537 up_write(&card->controls_rwsem);
538 return 0;
539 }
540
541 EXPORT_SYMBOL(snd_ctl_rename_id);
542
543 /**
544 * snd_ctl_find_numid - find the control instance with the given number-id
545 * @card: the card instance
546 * @numid: the number-id to search
547 *
548 * Finds the control instance with the given number-id from the card.
549 *
550 * Returns the pointer of the instance if found, or NULL if not.
551 *
552 * The caller must down card->controls_rwsem before calling this function
553 * (if the race condition can happen).
554 */
555 struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid)
556 {
557 struct snd_kcontrol *kctl;
558
559 if (snd_BUG_ON(!card || !numid))
560 return NULL;
561 list_for_each_entry(kctl, &card->controls, list) {
562 if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid)
563 return kctl;
564 }
565 return NULL;
566 }
567
568 EXPORT_SYMBOL(snd_ctl_find_numid);
569
570 /**
571 * snd_ctl_find_id - find the control instance with the given id
572 * @card: the card instance
573 * @id: the id to search
574 *
575 * Finds the control instance with the given id from the card.
576 *
577 * Returns the pointer of the instance if found, or NULL if not.
578 *
579 * The caller must down card->controls_rwsem before calling this function
580 * (if the race condition can happen).
581 */
582 struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card,
583 struct snd_ctl_elem_id *id)
584 {
585 struct snd_kcontrol *kctl;
586
587 if (snd_BUG_ON(!card || !id))
588 return NULL;
589 if (id->numid != 0)
590 return snd_ctl_find_numid(card, id->numid);
591 list_for_each_entry(kctl, &card->controls, list) {
592 if (kctl->id.iface != id->iface)
593 continue;
594 if (kctl->id.device != id->device)
595 continue;
596 if (kctl->id.subdevice != id->subdevice)
597 continue;
598 if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name)))
599 continue;
600 if (kctl->id.index > id->index)
601 continue;
602 if (kctl->id.index + kctl->count <= id->index)
603 continue;
604 return kctl;
605 }
606 return NULL;
607 }
608
609 EXPORT_SYMBOL(snd_ctl_find_id);
610
611 static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,
612 unsigned int cmd, void __user *arg)
613 {
614 struct snd_ctl_card_info *info;
615
616 info = kzalloc(sizeof(*info), GFP_KERNEL);
617 if (! info)
618 return -ENOMEM;
619 down_read(&snd_ioctl_rwsem);
620 info->card = card->number;
621 strlcpy(info->id, card->id, sizeof(info->id));
622 strlcpy(info->driver, card->driver, sizeof(info->driver));
623 strlcpy(info->name, card->shortname, sizeof(info->name));
624 strlcpy(info->longname, card->longname, sizeof(info->longname));
625 strlcpy(info->mixername, card->mixername, sizeof(info->mixername));
626 strlcpy(info->components, card->components, sizeof(info->components));
627 up_read(&snd_ioctl_rwsem);
628 if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) {
629 kfree(info);
630 return -EFAULT;
631 }
632 kfree(info);
633 return 0;
634 }
635
636 static int snd_ctl_elem_list(struct snd_card *card,
637 struct snd_ctl_elem_list __user *_list)
638 {
639 struct list_head *plist;
640 struct snd_ctl_elem_list list;
641 struct snd_kcontrol *kctl;
642 struct snd_ctl_elem_id *dst, *id;
643 unsigned int offset, space, first, jidx;
644
645 if (copy_from_user(&list, _list, sizeof(list)))
646 return -EFAULT;
647 offset = list.offset;
648 space = list.space;
649 first = 0;
650 /* try limit maximum space */
651 if (space > 16384)
652 return -ENOMEM;
653 if (space > 0) {
654 /* allocate temporary buffer for atomic operation */
655 dst = vmalloc(space * sizeof(struct snd_ctl_elem_id));
656 if (dst == NULL)
657 return -ENOMEM;
658 down_read(&card->controls_rwsem);
659 list.count = card->controls_count;
660 plist = card->controls.next;
661 while (plist != &card->controls) {
662 if (offset == 0)
663 break;
664 kctl = snd_kcontrol(plist);
665 if (offset < kctl->count)
666 break;
667 offset -= kctl->count;
668 plist = plist->next;
669 }
670 list.used = 0;
671 id = dst;
672 while (space > 0 && plist != &card->controls) {
673 kctl = snd_kcontrol(plist);
674 for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) {
675 snd_ctl_build_ioff(id, kctl, jidx);
676 id++;
677 space--;
678 list.used++;
679 }
680 plist = plist->next;
681 offset = 0;
682 }
683 up_read(&card->controls_rwsem);
684 if (list.used > 0 &&
685 copy_to_user(list.pids, dst,
686 list.used * sizeof(struct snd_ctl_elem_id))) {
687 vfree(dst);
688 return -EFAULT;
689 }
690 vfree(dst);
691 } else {
692 down_read(&card->controls_rwsem);
693 list.count = card->controls_count;
694 up_read(&card->controls_rwsem);
695 }
696 if (copy_to_user(_list, &list, sizeof(list)))
697 return -EFAULT;
698 return 0;
699 }
700
701 static int snd_ctl_elem_info(struct snd_ctl_file *ctl,
702 struct snd_ctl_elem_info *info)
703 {
704 struct snd_card *card = ctl->card;
705 struct snd_kcontrol *kctl;
706 struct snd_kcontrol_volatile *vd;
707 unsigned int index_offset;
708 int result;
709
710 down_read(&card->controls_rwsem);
711 kctl = snd_ctl_find_id(card, &info->id);
712 if (kctl == NULL) {
713 up_read(&card->controls_rwsem);
714 return -ENOENT;
715 }
716 #ifdef CONFIG_SND_DEBUG
717 info->access = 0;
718 #endif
719 result = kctl->info(kctl, info);
720 if (result >= 0) {
721 snd_BUG_ON(info->access);
722 index_offset = snd_ctl_get_ioff(kctl, &info->id);
723 vd = &kctl->vd[index_offset];
724 snd_ctl_build_ioff(&info->id, kctl, index_offset);
725 info->access = vd->access;
726 if (vd->owner) {
727 info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK;
728 if (vd->owner == ctl)
729 info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER;
730 info->owner = pid_vnr(vd->owner->pid);
731 } else {
732 info->owner = -1;
733 }
734 }
735 up_read(&card->controls_rwsem);
736 return result;
737 }
738
739 static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,
740 struct snd_ctl_elem_info __user *_info)
741 {
742 struct snd_ctl_elem_info info;
743 int result;
744
745 if (copy_from_user(&info, _info, sizeof(info)))
746 return -EFAULT;
747 snd_power_lock(ctl->card);
748 result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
749 if (result >= 0)
750 result = snd_ctl_elem_info(ctl, &info);
751 snd_power_unlock(ctl->card);
752 if (result >= 0)
753 if (copy_to_user(_info, &info, sizeof(info)))
754 return -EFAULT;
755 return result;
756 }
757
758 static int snd_ctl_elem_read(struct snd_card *card,
759 struct snd_ctl_elem_value *control)
760 {
761 struct snd_kcontrol *kctl;
762 struct snd_kcontrol_volatile *vd;
763 unsigned int index_offset;
764 int result;
765
766 down_read(&card->controls_rwsem);
767 kctl = snd_ctl_find_id(card, &control->id);
768 if (kctl == NULL) {
769 result = -ENOENT;
770 } else {
771 index_offset = snd_ctl_get_ioff(kctl, &control->id);
772 vd = &kctl->vd[index_offset];
773 if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) &&
774 kctl->get != NULL) {
775 snd_ctl_build_ioff(&control->id, kctl, index_offset);
776 result = kctl->get(kctl, control);
777 } else
778 result = -EPERM;
779 }
780 up_read(&card->controls_rwsem);
781 return result;
782 }
783
784 static int snd_ctl_elem_read_user(struct snd_card *card,
785 struct snd_ctl_elem_value __user *_control)
786 {
787 struct snd_ctl_elem_value *control;
788 int result;
789
790 control = memdup_user(_control, sizeof(*control));
791 if (IS_ERR(control))
792 return PTR_ERR(control);
793
794 snd_power_lock(card);
795 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
796 if (result >= 0)
797 result = snd_ctl_elem_read(card, control);
798 snd_power_unlock(card);
799 if (result >= 0)
800 if (copy_to_user(_control, control, sizeof(*control)))
801 result = -EFAULT;
802 kfree(control);
803 return result;
804 }
805
806 static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file,
807 struct snd_ctl_elem_value *control)
808 {
809 struct snd_kcontrol *kctl;
810 struct snd_kcontrol_volatile *vd;
811 unsigned int index_offset;
812 int result;
813
814 down_read(&card->controls_rwsem);
815 kctl = snd_ctl_find_id(card, &control->id);
816 if (kctl == NULL) {
817 result = -ENOENT;
818 } else {
819 index_offset = snd_ctl_get_ioff(kctl, &control->id);
820 vd = &kctl->vd[index_offset];
821 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) ||
822 kctl->put == NULL ||
823 (file && vd->owner && vd->owner != file)) {
824 result = -EPERM;
825 } else {
826 snd_ctl_build_ioff(&control->id, kctl, index_offset);
827 result = kctl->put(kctl, control);
828 }
829 if (result > 0) {
830 up_read(&card->controls_rwsem);
831 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
832 &control->id);
833 return 0;
834 }
835 }
836 up_read(&card->controls_rwsem);
837 return result;
838 }
839
840 static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
841 struct snd_ctl_elem_value __user *_control)
842 {
843 struct snd_ctl_elem_value *control;
844 struct snd_card *card;
845 int result;
846
847 control = memdup_user(_control, sizeof(*control));
848 if (IS_ERR(control))
849 return PTR_ERR(control);
850
851 card = file->card;
852 snd_power_lock(card);
853 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
854 if (result >= 0)
855 result = snd_ctl_elem_write(card, file, control);
856 snd_power_unlock(card);
857 if (result >= 0)
858 if (copy_to_user(_control, control, sizeof(*control)))
859 result = -EFAULT;
860 kfree(control);
861 return result;
862 }
863
864 static int snd_ctl_elem_lock(struct snd_ctl_file *file,
865 struct snd_ctl_elem_id __user *_id)
866 {
867 struct snd_card *card = file->card;
868 struct snd_ctl_elem_id id;
869 struct snd_kcontrol *kctl;
870 struct snd_kcontrol_volatile *vd;
871 int result;
872
873 if (copy_from_user(&id, _id, sizeof(id)))
874 return -EFAULT;
875 down_write(&card->controls_rwsem);
876 kctl = snd_ctl_find_id(card, &id);
877 if (kctl == NULL) {
878 result = -ENOENT;
879 } else {
880 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
881 if (vd->owner != NULL)
882 result = -EBUSY;
883 else {
884 vd->owner = file;
885 result = 0;
886 }
887 }
888 up_write(&card->controls_rwsem);
889 return result;
890 }
891
892 static int snd_ctl_elem_unlock(struct snd_ctl_file *file,
893 struct snd_ctl_elem_id __user *_id)
894 {
895 struct snd_card *card = file->card;
896 struct snd_ctl_elem_id id;
897 struct snd_kcontrol *kctl;
898 struct snd_kcontrol_volatile *vd;
899 int result;
900
901 if (copy_from_user(&id, _id, sizeof(id)))
902 return -EFAULT;
903 down_write(&card->controls_rwsem);
904 kctl = snd_ctl_find_id(card, &id);
905 if (kctl == NULL) {
906 result = -ENOENT;
907 } else {
908 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
909 if (vd->owner == NULL)
910 result = -EINVAL;
911 else if (vd->owner != file)
912 result = -EPERM;
913 else {
914 vd->owner = NULL;
915 result = 0;
916 }
917 }
918 up_write(&card->controls_rwsem);
919 return result;
920 }
921
922 struct user_element {
923 struct snd_ctl_elem_info info;
924 void *elem_data; /* element data */
925 unsigned long elem_data_size; /* size of element data in bytes */
926 void *tlv_data; /* TLV data */
927 unsigned long tlv_data_size; /* TLV data size */
928 void *priv_data; /* private data (like strings for enumerated type) */
929 unsigned long priv_data_size; /* size of private data in bytes */
930 };
931
932 static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol,
933 struct snd_ctl_elem_info *uinfo)
934 {
935 struct user_element *ue = kcontrol->private_data;
936
937 *uinfo = ue->info;
938 return 0;
939 }
940
941 static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol,
942 struct snd_ctl_elem_value *ucontrol)
943 {
944 struct user_element *ue = kcontrol->private_data;
945
946 memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size);
947 return 0;
948 }
949
950 static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol,
951 struct snd_ctl_elem_value *ucontrol)
952 {
953 int change;
954 struct user_element *ue = kcontrol->private_data;
955
956 change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0;
957 if (change)
958 memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size);
959 return change;
960 }
961
962 static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol,
963 int op_flag,
964 unsigned int size,
965 unsigned int __user *tlv)
966 {
967 struct user_element *ue = kcontrol->private_data;
968 int change = 0;
969 void *new_data;
970
971 if (op_flag > 0) {
972 if (size > 1024 * 128) /* sane value */
973 return -EINVAL;
974
975 new_data = memdup_user(tlv, size);
976 if (IS_ERR(new_data))
977 return PTR_ERR(new_data);
978 change = ue->tlv_data_size != size;
979 if (!change)
980 change = memcmp(ue->tlv_data, new_data, size);
981 kfree(ue->tlv_data);
982 ue->tlv_data = new_data;
983 ue->tlv_data_size = size;
984 } else {
985 if (! ue->tlv_data_size || ! ue->tlv_data)
986 return -ENXIO;
987 if (size < ue->tlv_data_size)
988 return -ENOSPC;
989 if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size))
990 return -EFAULT;
991 }
992 return change;
993 }
994
995 static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol)
996 {
997 struct user_element *ue = kcontrol->private_data;
998 if (ue->tlv_data)
999 kfree(ue->tlv_data);
1000 kfree(ue);
1001 }
1002
1003 static int snd_ctl_elem_add(struct snd_ctl_file *file,
1004 struct snd_ctl_elem_info *info, int replace)
1005 {
1006 struct snd_card *card = file->card;
1007 struct snd_kcontrol kctl, *_kctl;
1008 unsigned int access;
1009 long private_size;
1010 struct user_element *ue;
1011 int idx, err;
1012
1013 if (card->user_ctl_count >= MAX_USER_CONTROLS)
1014 return -ENOMEM;
1015 if (info->count < 1)
1016 return -EINVAL;
1017 access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
1018 (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
1019 SNDRV_CTL_ELEM_ACCESS_INACTIVE|
1020 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE));
1021 info->id.numid = 0;
1022 memset(&kctl, 0, sizeof(kctl));
1023 down_write(&card->controls_rwsem);
1024 _kctl = snd_ctl_find_id(card, &info->id);
1025 err = 0;
1026 if (_kctl) {
1027 if (replace)
1028 err = snd_ctl_remove(card, _kctl);
1029 else
1030 err = -EBUSY;
1031 } else {
1032 if (replace)
1033 err = -ENOENT;
1034 }
1035 up_write(&card->controls_rwsem);
1036 if (err < 0)
1037 return err;
1038 memcpy(&kctl.id, &info->id, sizeof(info->id));
1039 kctl.count = info->owner ? info->owner : 1;
1040 access |= SNDRV_CTL_ELEM_ACCESS_USER;
1041 kctl.info = snd_ctl_elem_user_info;
1042 if (access & SNDRV_CTL_ELEM_ACCESS_READ)
1043 kctl.get = snd_ctl_elem_user_get;
1044 if (access & SNDRV_CTL_ELEM_ACCESS_WRITE)
1045 kctl.put = snd_ctl_elem_user_put;
1046 if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) {
1047 kctl.tlv.c = snd_ctl_elem_user_tlv;
1048 access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1049 }
1050 switch (info->type) {
1051 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
1052 case SNDRV_CTL_ELEM_TYPE_INTEGER:
1053 private_size = sizeof(long);
1054 if (info->count > 128)
1055 return -EINVAL;
1056 break;
1057 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
1058 private_size = sizeof(long long);
1059 if (info->count > 64)
1060 return -EINVAL;
1061 break;
1062 case SNDRV_CTL_ELEM_TYPE_BYTES:
1063 private_size = sizeof(unsigned char);
1064 if (info->count > 512)
1065 return -EINVAL;
1066 break;
1067 case SNDRV_CTL_ELEM_TYPE_IEC958:
1068 private_size = sizeof(struct snd_aes_iec958);
1069 if (info->count != 1)
1070 return -EINVAL;
1071 break;
1072 default:
1073 return -EINVAL;
1074 }
1075 private_size *= info->count;
1076 ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL);
1077 if (ue == NULL)
1078 return -ENOMEM;
1079 ue->info = *info;
1080 ue->info.access = 0;
1081 ue->elem_data = (char *)ue + sizeof(*ue);
1082 ue->elem_data_size = private_size;
1083 kctl.private_free = snd_ctl_elem_user_free;
1084 _kctl = snd_ctl_new(&kctl, access);
1085 if (_kctl == NULL) {
1086 kfree(ue);
1087 return -ENOMEM;
1088 }
1089 _kctl->private_data = ue;
1090 for (idx = 0; idx < _kctl->count; idx++)
1091 _kctl->vd[idx].owner = file;
1092 err = snd_ctl_add(card, _kctl);
1093 if (err < 0)
1094 return err;
1095
1096 down_write(&card->controls_rwsem);
1097 card->user_ctl_count++;
1098 up_write(&card->controls_rwsem);
1099
1100 return 0;
1101 }
1102
1103 static int snd_ctl_elem_add_user(struct snd_ctl_file *file,
1104 struct snd_ctl_elem_info __user *_info, int replace)
1105 {
1106 struct snd_ctl_elem_info info;
1107 if (copy_from_user(&info, _info, sizeof(info)))
1108 return -EFAULT;
1109 return snd_ctl_elem_add(file, &info, replace);
1110 }
1111
1112 static int snd_ctl_elem_remove(struct snd_ctl_file *file,
1113 struct snd_ctl_elem_id __user *_id)
1114 {
1115 struct snd_ctl_elem_id id;
1116
1117 if (copy_from_user(&id, _id, sizeof(id)))
1118 return -EFAULT;
1119 return snd_ctl_remove_user_ctl(file, &id);
1120 }
1121
1122 static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr)
1123 {
1124 int subscribe;
1125 if (get_user(subscribe, ptr))
1126 return -EFAULT;
1127 if (subscribe < 0) {
1128 subscribe = file->subscribed;
1129 if (put_user(subscribe, ptr))
1130 return -EFAULT;
1131 return 0;
1132 }
1133 if (subscribe) {
1134 file->subscribed = 1;
1135 return 0;
1136 } else if (file->subscribed) {
1137 snd_ctl_empty_read_queue(file);
1138 file->subscribed = 0;
1139 }
1140 return 0;
1141 }
1142
1143 static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file,
1144 struct snd_ctl_tlv __user *_tlv,
1145 int op_flag)
1146 {
1147 struct snd_card *card = file->card;
1148 struct snd_ctl_tlv tlv;
1149 struct snd_kcontrol *kctl;
1150 struct snd_kcontrol_volatile *vd;
1151 unsigned int len;
1152 int err = 0;
1153
1154 if (copy_from_user(&tlv, _tlv, sizeof(tlv)))
1155 return -EFAULT;
1156 if (tlv.length < sizeof(unsigned int) * 2)
1157 return -EINVAL;
1158 down_read(&card->controls_rwsem);
1159 kctl = snd_ctl_find_numid(card, tlv.numid);
1160 if (kctl == NULL) {
1161 err = -ENOENT;
1162 goto __kctl_end;
1163 }
1164 if (kctl->tlv.p == NULL) {
1165 err = -ENXIO;
1166 goto __kctl_end;
1167 }
1168 vd = &kctl->vd[tlv.numid - kctl->id.numid];
1169 if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) ||
1170 (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) ||
1171 (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) {
1172 err = -ENXIO;
1173 goto __kctl_end;
1174 }
1175 if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) {
1176 if (vd->owner != NULL && vd->owner != file) {
1177 err = -EPERM;
1178 goto __kctl_end;
1179 }
1180 err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv);
1181 if (err > 0) {
1182 up_read(&card->controls_rwsem);
1183 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id);
1184 return 0;
1185 }
1186 } else {
1187 if (op_flag) {
1188 err = -ENXIO;
1189 goto __kctl_end;
1190 }
1191 len = kctl->tlv.p[1] + 2 * sizeof(unsigned int);
1192 if (tlv.length < len) {
1193 err = -ENOMEM;
1194 goto __kctl_end;
1195 }
1196 if (copy_to_user(_tlv->tlv, kctl->tlv.p, len))
1197 err = -EFAULT;
1198 }
1199 __kctl_end:
1200 up_read(&card->controls_rwsem);
1201 return err;
1202 }
1203
1204 static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1205 {
1206 struct snd_ctl_file *ctl;
1207 struct snd_card *card;
1208 struct snd_kctl_ioctl *p;
1209 void __user *argp = (void __user *)arg;
1210 int __user *ip = argp;
1211 int err;
1212
1213 ctl = file->private_data;
1214 card = ctl->card;
1215 if (snd_BUG_ON(!card))
1216 return -ENXIO;
1217 switch (cmd) {
1218 case SNDRV_CTL_IOCTL_PVERSION:
1219 return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0;
1220 case SNDRV_CTL_IOCTL_CARD_INFO:
1221 return snd_ctl_card_info(card, ctl, cmd, argp);
1222 case SNDRV_CTL_IOCTL_ELEM_LIST:
1223 return snd_ctl_elem_list(card, argp);
1224 case SNDRV_CTL_IOCTL_ELEM_INFO:
1225 return snd_ctl_elem_info_user(ctl, argp);
1226 case SNDRV_CTL_IOCTL_ELEM_READ:
1227 return snd_ctl_elem_read_user(card, argp);
1228 case SNDRV_CTL_IOCTL_ELEM_WRITE:
1229 return snd_ctl_elem_write_user(ctl, argp);
1230 case SNDRV_CTL_IOCTL_ELEM_LOCK:
1231 return snd_ctl_elem_lock(ctl, argp);
1232 case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
1233 return snd_ctl_elem_unlock(ctl, argp);
1234 case SNDRV_CTL_IOCTL_ELEM_ADD:
1235 return snd_ctl_elem_add_user(ctl, argp, 0);
1236 case SNDRV_CTL_IOCTL_ELEM_REPLACE:
1237 return snd_ctl_elem_add_user(ctl, argp, 1);
1238 case SNDRV_CTL_IOCTL_ELEM_REMOVE:
1239 return snd_ctl_elem_remove(ctl, argp);
1240 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
1241 return snd_ctl_subscribe_events(ctl, ip);
1242 case SNDRV_CTL_IOCTL_TLV_READ:
1243 return snd_ctl_tlv_ioctl(ctl, argp, 0);
1244 case SNDRV_CTL_IOCTL_TLV_WRITE:
1245 return snd_ctl_tlv_ioctl(ctl, argp, 1);
1246 case SNDRV_CTL_IOCTL_TLV_COMMAND:
1247 return snd_ctl_tlv_ioctl(ctl, argp, -1);
1248 case SNDRV_CTL_IOCTL_POWER:
1249 return -ENOPROTOOPT;
1250 case SNDRV_CTL_IOCTL_POWER_STATE:
1251 #ifdef CONFIG_PM
1252 return put_user(card->power_state, ip) ? -EFAULT : 0;
1253 #else
1254 return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0;
1255 #endif
1256 }
1257 down_read(&snd_ioctl_rwsem);
1258 list_for_each_entry(p, &snd_control_ioctls, list) {
1259 err = p->fioctl(card, ctl, cmd, arg);
1260 if (err != -ENOIOCTLCMD) {
1261 up_read(&snd_ioctl_rwsem);
1262 return err;
1263 }
1264 }
1265 up_read(&snd_ioctl_rwsem);
1266 snd_printdd("unknown ioctl = 0x%x\n", cmd);
1267 return -ENOTTY;
1268 }
1269
1270 static ssize_t snd_ctl_read(struct file *file, char __user *buffer,
1271 size_t count, loff_t * offset)
1272 {
1273 struct snd_ctl_file *ctl;
1274 int err = 0;
1275 ssize_t result = 0;
1276
1277 ctl = file->private_data;
1278 if (snd_BUG_ON(!ctl || !ctl->card))
1279 return -ENXIO;
1280 if (!ctl->subscribed)
1281 return -EBADFD;
1282 if (count < sizeof(struct snd_ctl_event))
1283 return -EINVAL;
1284 spin_lock_irq(&ctl->read_lock);
1285 while (count >= sizeof(struct snd_ctl_event)) {
1286 struct snd_ctl_event ev;
1287 struct snd_kctl_event *kev;
1288 while (list_empty(&ctl->events)) {
1289 wait_queue_t wait;
1290 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1291 err = -EAGAIN;
1292 goto __end_lock;
1293 }
1294 init_waitqueue_entry(&wait, current);
1295 add_wait_queue(&ctl->change_sleep, &wait);
1296 set_current_state(TASK_INTERRUPTIBLE);
1297 spin_unlock_irq(&ctl->read_lock);
1298 schedule();
1299 remove_wait_queue(&ctl->change_sleep, &wait);
1300 if (signal_pending(current))
1301 return -ERESTARTSYS;
1302 spin_lock_irq(&ctl->read_lock);
1303 }
1304 kev = snd_kctl_event(ctl->events.next);
1305 ev.type = SNDRV_CTL_EVENT_ELEM;
1306 ev.data.elem.mask = kev->mask;
1307 ev.data.elem.id = kev->id;
1308 list_del(&kev->list);
1309 spin_unlock_irq(&ctl->read_lock);
1310 kfree(kev);
1311 if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) {
1312 err = -EFAULT;
1313 goto __end;
1314 }
1315 spin_lock_irq(&ctl->read_lock);
1316 buffer += sizeof(struct snd_ctl_event);
1317 count -= sizeof(struct snd_ctl_event);
1318 result += sizeof(struct snd_ctl_event);
1319 }
1320 __end_lock:
1321 spin_unlock_irq(&ctl->read_lock);
1322 __end:
1323 return result > 0 ? result : err;
1324 }
1325
1326 static unsigned int snd_ctl_poll(struct file *file, poll_table * wait)
1327 {
1328 unsigned int mask;
1329 struct snd_ctl_file *ctl;
1330
1331 ctl = file->private_data;
1332 if (!ctl->subscribed)
1333 return 0;
1334 poll_wait(file, &ctl->change_sleep, wait);
1335
1336 mask = 0;
1337 if (!list_empty(&ctl->events))
1338 mask |= POLLIN | POLLRDNORM;
1339
1340 return mask;
1341 }
1342
1343 /*
1344 * register the device-specific control-ioctls.
1345 * called from each device manager like pcm.c, hwdep.c, etc.
1346 */
1347 static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists)
1348 {
1349 struct snd_kctl_ioctl *pn;
1350
1351 pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL);
1352 if (pn == NULL)
1353 return -ENOMEM;
1354 pn->fioctl = fcn;
1355 down_write(&snd_ioctl_rwsem);
1356 list_add_tail(&pn->list, lists);
1357 up_write(&snd_ioctl_rwsem);
1358 return 0;
1359 }
1360
1361 int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn)
1362 {
1363 return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls);
1364 }
1365
1366 EXPORT_SYMBOL(snd_ctl_register_ioctl);
1367
1368 #ifdef CONFIG_COMPAT
1369 int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1370 {
1371 return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls);
1372 }
1373
1374 EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
1375 #endif
1376
1377 /*
1378 * de-register the device-specific control-ioctls.
1379 */
1380 static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn,
1381 struct list_head *lists)
1382 {
1383 struct snd_kctl_ioctl *p;
1384
1385 if (snd_BUG_ON(!fcn))
1386 return -EINVAL;
1387 down_write(&snd_ioctl_rwsem);
1388 list_for_each_entry(p, lists, list) {
1389 if (p->fioctl == fcn) {
1390 list_del(&p->list);
1391 up_write(&snd_ioctl_rwsem);
1392 kfree(p);
1393 return 0;
1394 }
1395 }
1396 up_write(&snd_ioctl_rwsem);
1397 snd_BUG();
1398 return -EINVAL;
1399 }
1400
1401 int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn)
1402 {
1403 return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls);
1404 }
1405
1406 EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
1407
1408 #ifdef CONFIG_COMPAT
1409 int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1410 {
1411 return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls);
1412 }
1413
1414 EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
1415 #endif
1416
1417 static int snd_ctl_fasync(int fd, struct file * file, int on)
1418 {
1419 struct snd_ctl_file *ctl;
1420
1421 ctl = file->private_data;
1422 return fasync_helper(fd, file, on, &ctl->fasync);
1423 }
1424
1425 /*
1426 * ioctl32 compat
1427 */
1428 #ifdef CONFIG_COMPAT
1429 #include "control_compat.c"
1430 #else
1431 #define snd_ctl_ioctl_compat NULL
1432 #endif
1433
1434 /*
1435 * INIT PART
1436 */
1437
1438 static const struct file_operations snd_ctl_f_ops =
1439 {
1440 .owner = THIS_MODULE,
1441 .read = snd_ctl_read,
1442 .open = snd_ctl_open,
1443 .release = snd_ctl_release,
1444 .llseek = no_llseek,
1445 .poll = snd_ctl_poll,
1446 .unlocked_ioctl = snd_ctl_ioctl,
1447 .compat_ioctl = snd_ctl_ioctl_compat,
1448 .fasync = snd_ctl_fasync,
1449 };
1450
1451 /*
1452 * registration of the control device
1453 */
1454 static int snd_ctl_dev_register(struct snd_device *device)
1455 {
1456 struct snd_card *card = device->device_data;
1457 int err, cardnum;
1458 char name[16];
1459
1460 if (snd_BUG_ON(!card))
1461 return -ENXIO;
1462 cardnum = card->number;
1463 if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1464 return -ENXIO;
1465 sprintf(name, "controlC%i", cardnum);
1466 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
1467 &snd_ctl_f_ops, card, name)) < 0)
1468 return err;
1469 return 0;
1470 }
1471
1472 /*
1473 * disconnection of the control device
1474 */
1475 static int snd_ctl_dev_disconnect(struct snd_device *device)
1476 {
1477 struct snd_card *card = device->device_data;
1478 struct snd_ctl_file *ctl;
1479 int err, cardnum;
1480
1481 if (snd_BUG_ON(!card))
1482 return -ENXIO;
1483 cardnum = card->number;
1484 if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1485 return -ENXIO;
1486
1487 read_lock(&card->ctl_files_rwlock);
1488 list_for_each_entry(ctl, &card->ctl_files, list) {
1489 wake_up(&ctl->change_sleep);
1490 kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);
1491 }
1492 read_unlock(&card->ctl_files_rwlock);
1493
1494 if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL,
1495 card, -1)) < 0)
1496 return err;
1497 return 0;
1498 }
1499
1500 /*
1501 * free all controls
1502 */
1503 static int snd_ctl_dev_free(struct snd_device *device)
1504 {
1505 struct snd_card *card = device->device_data;
1506 struct snd_kcontrol *control;
1507
1508 down_write(&card->controls_rwsem);
1509 while (!list_empty(&card->controls)) {
1510 control = snd_kcontrol(card->controls.next);
1511 snd_ctl_remove(card, control);
1512 }
1513 up_write(&card->controls_rwsem);
1514 return 0;
1515 }
1516
1517 /*
1518 * create control core:
1519 * called from init.c
1520 */
1521 int snd_ctl_create(struct snd_card *card)
1522 {
1523 static struct snd_device_ops ops = {
1524 .dev_free = snd_ctl_dev_free,
1525 .dev_register = snd_ctl_dev_register,
1526 .dev_disconnect = snd_ctl_dev_disconnect,
1527 };
1528
1529 if (snd_BUG_ON(!card))
1530 return -ENXIO;
1531 return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);
1532 }
1533
1534 /*
1535 * Frequently used control callbacks/helpers
1536 */
1537 int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
1538 struct snd_ctl_elem_info *uinfo)
1539 {
1540 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1541 uinfo->count = 1;
1542 uinfo->value.integer.min = 0;
1543 uinfo->value.integer.max = 1;
1544 return 0;
1545 }
1546
1547 EXPORT_SYMBOL(snd_ctl_boolean_mono_info);
1548
1549 int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
1550 struct snd_ctl_elem_info *uinfo)
1551 {
1552 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1553 uinfo->count = 2;
1554 uinfo->value.integer.min = 0;
1555 uinfo->value.integer.max = 1;
1556 return 0;
1557 }
1558
1559 EXPORT_SYMBOL(snd_ctl_boolean_stereo_info);
1560
1561 /**
1562 * snd_ctl_enum_info - fills the info structure for an enumerated control
1563 * @info: the structure to be filled
1564 * @channels: the number of the control's channels; often one
1565 * @items: the number of control values; also the size of @names
1566 * @names: an array containing the names of all control values
1567 *
1568 * Sets all required fields in @info to their appropriate values.
1569 * If the control's accessibility is not the default (readable and writable),
1570 * the caller has to fill @info->access.
1571 */
1572 int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels,
1573 unsigned int items, const char *const names[])
1574 {
1575 info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
1576 info->count = channels;
1577 info->value.enumerated.items = items;
1578 if (info->value.enumerated.item >= items)
1579 info->value.enumerated.item = items - 1;
1580 strlcpy(info->value.enumerated.name,
1581 names[info->value.enumerated.item],
1582 sizeof(info->value.enumerated.name));
1583 return 0;
1584 }
1585 EXPORT_SYMBOL(snd_ctl_enum_info);
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