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bcma: allow enabling PLL
[linux-2.6/libata-dev.git] / sound / core / control.c
blob5d98194bcad55b6963037d95d35743909517018a
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_replace - replace the control instance of the card
370 * @card: the card instance
371 * @kcontrol: the control instance to replace
372 * @add_on_replace: add the control if not already added
373 *
374 * Replaces the given control. If the given control does not exist
375 * and the add_on_replace flag is set, the control is added. If the
376 * control exists, it is destroyed first.
377 *
378 * Returns zero if successful, or a negative error code on failure.
379 *
380 * It frees automatically the control which cannot be added or replaced.
381 */
382 int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol,
383 bool add_on_replace)
384 {
385 struct snd_ctl_elem_id id;
386 unsigned int idx;
387 struct snd_kcontrol *old;
388 int ret;
389
390 if (!kcontrol)
391 return -EINVAL;
392 if (snd_BUG_ON(!card || !kcontrol->info)) {
393 ret = -EINVAL;
394 goto error;
395 }
396 id = kcontrol->id;
397 down_write(&card->controls_rwsem);
398 old = snd_ctl_find_id(card, &id);
399 if (!old) {
400 if (add_on_replace)
401 goto add;
402 up_write(&card->controls_rwsem);
403 ret = -EINVAL;
404 goto error;
405 }
406 ret = snd_ctl_remove(card, old);
407 if (ret < 0) {
408 up_write(&card->controls_rwsem);
409 goto error;
410 }
411 add:
412 if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
413 up_write(&card->controls_rwsem);
414 ret = -ENOMEM;
415 goto error;
416 }
417 list_add_tail(&kcontrol->list, &card->controls);
418 card->controls_count += kcontrol->count;
419 kcontrol->id.numid = card->last_numid + 1;
420 card->last_numid += kcontrol->count;
421 up_write(&card->controls_rwsem);
422 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
423 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
424 return 0;
425
426 error:
427 snd_ctl_free_one(kcontrol);
428 return ret;
429 }
430 EXPORT_SYMBOL(snd_ctl_replace);
431
432 /**
433 * snd_ctl_remove - remove the control from the card and release it
434 * @card: the card instance
435 * @kcontrol: the control instance to remove
436 *
437 * Removes the control from the card and then releases the instance.
438 * You don't need to call snd_ctl_free_one(). You must be in
439 * the write lock - down_write(&card->controls_rwsem).
440 *
441 * Returns 0 if successful, or a negative error code on failure.
442 */
443 int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol)
444 {
445 struct snd_ctl_elem_id id;
446 unsigned int idx;
447
448 if (snd_BUG_ON(!card || !kcontrol))
449 return -EINVAL;
450 list_del(&kcontrol->list);
451 card->controls_count -= kcontrol->count;
452 id = kcontrol->id;
453 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
454 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id);
455 snd_ctl_free_one(kcontrol);
456 return 0;
457 }
458
459 EXPORT_SYMBOL(snd_ctl_remove);
460
461 /**
462 * snd_ctl_remove_id - remove the control of the given id and release it
463 * @card: the card instance
464 * @id: the control id to remove
465 *
466 * Finds the control instance with the given id, removes it from the
467 * card list and releases it.
468 *
469 * Returns 0 if successful, or a negative error code on failure.
470 */
471 int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id)
472 {
473 struct snd_kcontrol *kctl;
474 int ret;
475
476 down_write(&card->controls_rwsem);
477 kctl = snd_ctl_find_id(card, id);
478 if (kctl == NULL) {
479 up_write(&card->controls_rwsem);
480 return -ENOENT;
481 }
482 ret = snd_ctl_remove(card, kctl);
483 up_write(&card->controls_rwsem);
484 return ret;
485 }
486
487 EXPORT_SYMBOL(snd_ctl_remove_id);
488
489 /**
490 * snd_ctl_remove_user_ctl - remove and release the unlocked user control
491 * @file: active control handle
492 * @id: the control id to remove
493 *
494 * Finds the control instance with the given id, removes it from the
495 * card list and releases it.
496 *
497 * Returns 0 if successful, or a negative error code on failure.
498 */
499 static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file,
500 struct snd_ctl_elem_id *id)
501 {
502 struct snd_card *card = file->card;
503 struct snd_kcontrol *kctl;
504 int idx, ret;
505
506 down_write(&card->controls_rwsem);
507 kctl = snd_ctl_find_id(card, id);
508 if (kctl == NULL) {
509 ret = -ENOENT;
510 goto error;
511 }
512 if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) {
513 ret = -EINVAL;
514 goto error;
515 }
516 for (idx = 0; idx < kctl->count; idx++)
517 if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {
518 ret = -EBUSY;
519 goto error;
520 }
521 ret = snd_ctl_remove(card, kctl);
522 if (ret < 0)
523 goto error;
524 card->user_ctl_count--;
525 error:
526 up_write(&card->controls_rwsem);
527 return ret;
528 }
529
530 /**
531 * snd_ctl_activate_id - activate/inactivate the control of the given id
532 * @card: the card instance
533 * @id: the control id to activate/inactivate
534 * @active: non-zero to activate
535 *
536 * Finds the control instance with the given id, and activate or
537 * inactivate the control together with notification, if changed.
538 *
539 * Returns 0 if unchanged, 1 if changed, or a negative error code on failure.
540 */
541 int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id,
542 int active)
543 {
544 struct snd_kcontrol *kctl;
545 struct snd_kcontrol_volatile *vd;
546 unsigned int index_offset;
547 int ret;
548
549 down_write(&card->controls_rwsem);
550 kctl = snd_ctl_find_id(card, id);
551 if (kctl == NULL) {
552 ret = -ENOENT;
553 goto unlock;
554 }
555 index_offset = snd_ctl_get_ioff(kctl, &kctl->id);
556 vd = &kctl->vd[index_offset];
557 ret = 0;
558 if (active) {
559 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE))
560 goto unlock;
561 vd->access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
562 } else {
563 if (vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)
564 goto unlock;
565 vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
566 }
567 ret = 1;
568 unlock:
569 up_write(&card->controls_rwsem);
570 if (ret > 0)
571 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, id);
572 return ret;
573 }
574 EXPORT_SYMBOL_GPL(snd_ctl_activate_id);
575
576 /**
577 * snd_ctl_rename_id - replace the id of a control on the card
578 * @card: the card instance
579 * @src_id: the old id
580 * @dst_id: the new id
581 *
582 * Finds the control with the old id from the card, and replaces the
583 * id with the new one.
584 *
585 * Returns zero if successful, or a negative error code on failure.
586 */
587 int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id,
588 struct snd_ctl_elem_id *dst_id)
589 {
590 struct snd_kcontrol *kctl;
591
592 down_write(&card->controls_rwsem);
593 kctl = snd_ctl_find_id(card, src_id);
594 if (kctl == NULL) {
595 up_write(&card->controls_rwsem);
596 return -ENOENT;
597 }
598 kctl->id = *dst_id;
599 kctl->id.numid = card->last_numid + 1;
600 card->last_numid += kctl->count;
601 up_write(&card->controls_rwsem);
602 return 0;
603 }
604
605 EXPORT_SYMBOL(snd_ctl_rename_id);
606
607 /**
608 * snd_ctl_find_numid - find the control instance with the given number-id
609 * @card: the card instance
610 * @numid: the number-id to search
611 *
612 * Finds the control instance with the given number-id from the card.
613 *
614 * Returns the pointer of the instance if found, or NULL if not.
615 *
616 * The caller must down card->controls_rwsem before calling this function
617 * (if the race condition can happen).
618 */
619 struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid)
620 {
621 struct snd_kcontrol *kctl;
622
623 if (snd_BUG_ON(!card || !numid))
624 return NULL;
625 list_for_each_entry(kctl, &card->controls, list) {
626 if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid)
627 return kctl;
628 }
629 return NULL;
630 }
631
632 EXPORT_SYMBOL(snd_ctl_find_numid);
633
634 /**
635 * snd_ctl_find_id - find the control instance with the given id
636 * @card: the card instance
637 * @id: the id to search
638 *
639 * Finds the control instance with the given id from the card.
640 *
641 * Returns the pointer of the instance if found, or NULL if not.
642 *
643 * The caller must down card->controls_rwsem before calling this function
644 * (if the race condition can happen).
645 */
646 struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card,
647 struct snd_ctl_elem_id *id)
648 {
649 struct snd_kcontrol *kctl;
650
651 if (snd_BUG_ON(!card || !id))
652 return NULL;
653 if (id->numid != 0)
654 return snd_ctl_find_numid(card, id->numid);
655 list_for_each_entry(kctl, &card->controls, list) {
656 if (kctl->id.iface != id->iface)
657 continue;
658 if (kctl->id.device != id->device)
659 continue;
660 if (kctl->id.subdevice != id->subdevice)
661 continue;
662 if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name)))
663 continue;
664 if (kctl->id.index > id->index)
665 continue;
666 if (kctl->id.index + kctl->count <= id->index)
667 continue;
668 return kctl;
669 }
670 return NULL;
671 }
672
673 EXPORT_SYMBOL(snd_ctl_find_id);
674
675 static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,
676 unsigned int cmd, void __user *arg)
677 {
678 struct snd_ctl_card_info *info;
679
680 info = kzalloc(sizeof(*info), GFP_KERNEL);
681 if (! info)
682 return -ENOMEM;
683 down_read(&snd_ioctl_rwsem);
684 info->card = card->number;
685 strlcpy(info->id, card->id, sizeof(info->id));
686 strlcpy(info->driver, card->driver, sizeof(info->driver));
687 strlcpy(info->name, card->shortname, sizeof(info->name));
688 strlcpy(info->longname, card->longname, sizeof(info->longname));
689 strlcpy(info->mixername, card->mixername, sizeof(info->mixername));
690 strlcpy(info->components, card->components, sizeof(info->components));
691 up_read(&snd_ioctl_rwsem);
692 if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) {
693 kfree(info);
694 return -EFAULT;
695 }
696 kfree(info);
697 return 0;
698 }
699
700 static int snd_ctl_elem_list(struct snd_card *card,
701 struct snd_ctl_elem_list __user *_list)
702 {
703 struct list_head *plist;
704 struct snd_ctl_elem_list list;
705 struct snd_kcontrol *kctl;
706 struct snd_ctl_elem_id *dst, *id;
707 unsigned int offset, space, first, jidx;
708
709 if (copy_from_user(&list, _list, sizeof(list)))
710 return -EFAULT;
711 offset = list.offset;
712 space = list.space;
713 first = 0;
714 /* try limit maximum space */
715 if (space > 16384)
716 return -ENOMEM;
717 if (space > 0) {
718 /* allocate temporary buffer for atomic operation */
719 dst = vmalloc(space * sizeof(struct snd_ctl_elem_id));
720 if (dst == NULL)
721 return -ENOMEM;
722 down_read(&card->controls_rwsem);
723 list.count = card->controls_count;
724 plist = card->controls.next;
725 while (plist != &card->controls) {
726 if (offset == 0)
727 break;
728 kctl = snd_kcontrol(plist);
729 if (offset < kctl->count)
730 break;
731 offset -= kctl->count;
732 plist = plist->next;
733 }
734 list.used = 0;
735 id = dst;
736 while (space > 0 && plist != &card->controls) {
737 kctl = snd_kcontrol(plist);
738 for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) {
739 snd_ctl_build_ioff(id, kctl, jidx);
740 id++;
741 space--;
742 list.used++;
743 }
744 plist = plist->next;
745 offset = 0;
746 }
747 up_read(&card->controls_rwsem);
748 if (list.used > 0 &&
749 copy_to_user(list.pids, dst,
750 list.used * sizeof(struct snd_ctl_elem_id))) {
751 vfree(dst);
752 return -EFAULT;
753 }
754 vfree(dst);
755 } else {
756 down_read(&card->controls_rwsem);
757 list.count = card->controls_count;
758 up_read(&card->controls_rwsem);
759 }
760 if (copy_to_user(_list, &list, sizeof(list)))
761 return -EFAULT;
762 return 0;
763 }
764
765 static int snd_ctl_elem_info(struct snd_ctl_file *ctl,
766 struct snd_ctl_elem_info *info)
767 {
768 struct snd_card *card = ctl->card;
769 struct snd_kcontrol *kctl;
770 struct snd_kcontrol_volatile *vd;
771 unsigned int index_offset;
772 int result;
773
774 down_read(&card->controls_rwsem);
775 kctl = snd_ctl_find_id(card, &info->id);
776 if (kctl == NULL) {
777 up_read(&card->controls_rwsem);
778 return -ENOENT;
779 }
780 #ifdef CONFIG_SND_DEBUG
781 info->access = 0;
782 #endif
783 result = kctl->info(kctl, info);
784 if (result >= 0) {
785 snd_BUG_ON(info->access);
786 index_offset = snd_ctl_get_ioff(kctl, &info->id);
787 vd = &kctl->vd[index_offset];
788 snd_ctl_build_ioff(&info->id, kctl, index_offset);
789 info->access = vd->access;
790 if (vd->owner) {
791 info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK;
792 if (vd->owner == ctl)
793 info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER;
794 info->owner = pid_vnr(vd->owner->pid);
795 } else {
796 info->owner = -1;
797 }
798 }
799 up_read(&card->controls_rwsem);
800 return result;
801 }
802
803 static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,
804 struct snd_ctl_elem_info __user *_info)
805 {
806 struct snd_ctl_elem_info info;
807 int result;
808
809 if (copy_from_user(&info, _info, sizeof(info)))
810 return -EFAULT;
811 snd_power_lock(ctl->card);
812 result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
813 if (result >= 0)
814 result = snd_ctl_elem_info(ctl, &info);
815 snd_power_unlock(ctl->card);
816 if (result >= 0)
817 if (copy_to_user(_info, &info, sizeof(info)))
818 return -EFAULT;
819 return result;
820 }
821
822 static int snd_ctl_elem_read(struct snd_card *card,
823 struct snd_ctl_elem_value *control)
824 {
825 struct snd_kcontrol *kctl;
826 struct snd_kcontrol_volatile *vd;
827 unsigned int index_offset;
828 int result;
829
830 down_read(&card->controls_rwsem);
831 kctl = snd_ctl_find_id(card, &control->id);
832 if (kctl == NULL) {
833 result = -ENOENT;
834 } else {
835 index_offset = snd_ctl_get_ioff(kctl, &control->id);
836 vd = &kctl->vd[index_offset];
837 if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) &&
838 kctl->get != NULL) {
839 snd_ctl_build_ioff(&control->id, kctl, index_offset);
840 result = kctl->get(kctl, control);
841 } else
842 result = -EPERM;
843 }
844 up_read(&card->controls_rwsem);
845 return result;
846 }
847
848 static int snd_ctl_elem_read_user(struct snd_card *card,
849 struct snd_ctl_elem_value __user *_control)
850 {
851 struct snd_ctl_elem_value *control;
852 int result;
853
854 control = memdup_user(_control, sizeof(*control));
855 if (IS_ERR(control))
856 return PTR_ERR(control);
857
858 snd_power_lock(card);
859 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
860 if (result >= 0)
861 result = snd_ctl_elem_read(card, control);
862 snd_power_unlock(card);
863 if (result >= 0)
864 if (copy_to_user(_control, control, sizeof(*control)))
865 result = -EFAULT;
866 kfree(control);
867 return result;
868 }
869
870 static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file,
871 struct snd_ctl_elem_value *control)
872 {
873 struct snd_kcontrol *kctl;
874 struct snd_kcontrol_volatile *vd;
875 unsigned int index_offset;
876 int result;
877
878 down_read(&card->controls_rwsem);
879 kctl = snd_ctl_find_id(card, &control->id);
880 if (kctl == NULL) {
881 result = -ENOENT;
882 } else {
883 index_offset = snd_ctl_get_ioff(kctl, &control->id);
884 vd = &kctl->vd[index_offset];
885 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) ||
886 kctl->put == NULL ||
887 (file && vd->owner && vd->owner != file)) {
888 result = -EPERM;
889 } else {
890 snd_ctl_build_ioff(&control->id, kctl, index_offset);
891 result = kctl->put(kctl, control);
892 }
893 if (result > 0) {
894 up_read(&card->controls_rwsem);
895 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
896 &control->id);
897 return 0;
898 }
899 }
900 up_read(&card->controls_rwsem);
901 return result;
902 }
903
904 static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
905 struct snd_ctl_elem_value __user *_control)
906 {
907 struct snd_ctl_elem_value *control;
908 struct snd_card *card;
909 int result;
910
911 control = memdup_user(_control, sizeof(*control));
912 if (IS_ERR(control))
913 return PTR_ERR(control);
914
915 card = file->card;
916 snd_power_lock(card);
917 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
918 if (result >= 0)
919 result = snd_ctl_elem_write(card, file, control);
920 snd_power_unlock(card);
921 if (result >= 0)
922 if (copy_to_user(_control, control, sizeof(*control)))
923 result = -EFAULT;
924 kfree(control);
925 return result;
926 }
927
928 static int snd_ctl_elem_lock(struct snd_ctl_file *file,
929 struct snd_ctl_elem_id __user *_id)
930 {
931 struct snd_card *card = file->card;
932 struct snd_ctl_elem_id id;
933 struct snd_kcontrol *kctl;
934 struct snd_kcontrol_volatile *vd;
935 int result;
936
937 if (copy_from_user(&id, _id, sizeof(id)))
938 return -EFAULT;
939 down_write(&card->controls_rwsem);
940 kctl = snd_ctl_find_id(card, &id);
941 if (kctl == NULL) {
942 result = -ENOENT;
943 } else {
944 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
945 if (vd->owner != NULL)
946 result = -EBUSY;
947 else {
948 vd->owner = file;
949 result = 0;
950 }
951 }
952 up_write(&card->controls_rwsem);
953 return result;
954 }
955
956 static int snd_ctl_elem_unlock(struct snd_ctl_file *file,
957 struct snd_ctl_elem_id __user *_id)
958 {
959 struct snd_card *card = file->card;
960 struct snd_ctl_elem_id id;
961 struct snd_kcontrol *kctl;
962 struct snd_kcontrol_volatile *vd;
963 int result;
964
965 if (copy_from_user(&id, _id, sizeof(id)))
966 return -EFAULT;
967 down_write(&card->controls_rwsem);
968 kctl = snd_ctl_find_id(card, &id);
969 if (kctl == NULL) {
970 result = -ENOENT;
971 } else {
972 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
973 if (vd->owner == NULL)
974 result = -EINVAL;
975 else if (vd->owner != file)
976 result = -EPERM;
977 else {
978 vd->owner = NULL;
979 result = 0;
980 }
981 }
982 up_write(&card->controls_rwsem);
983 return result;
984 }
985
986 struct user_element {
987 struct snd_ctl_elem_info info;
988 void *elem_data; /* element data */
989 unsigned long elem_data_size; /* size of element data in bytes */
990 void *tlv_data; /* TLV data */
991 unsigned long tlv_data_size; /* TLV data size */
992 void *priv_data; /* private data (like strings for enumerated type) */
993 unsigned long priv_data_size; /* size of private data in bytes */
994 };
995
996 static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol,
997 struct snd_ctl_elem_info *uinfo)
998 {
999 struct user_element *ue = kcontrol->private_data;
1000
1001 *uinfo = ue->info;
1002 return 0;
1003 }
1004
1005 static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol,
1006 struct snd_ctl_elem_value *ucontrol)
1007 {
1008 struct user_element *ue = kcontrol->private_data;
1009
1010 memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size);
1011 return 0;
1012 }
1013
1014 static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol,
1015 struct snd_ctl_elem_value *ucontrol)
1016 {
1017 int change;
1018 struct user_element *ue = kcontrol->private_data;
1019
1020 change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0;
1021 if (change)
1022 memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size);
1023 return change;
1024 }
1025
1026 static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol,
1027 int op_flag,
1028 unsigned int size,
1029 unsigned int __user *tlv)
1030 {
1031 struct user_element *ue = kcontrol->private_data;
1032 int change = 0;
1033 void *new_data;
1034
1035 if (op_flag > 0) {
1036 if (size > 1024 * 128) /* sane value */
1037 return -EINVAL;
1038
1039 new_data = memdup_user(tlv, size);
1040 if (IS_ERR(new_data))
1041 return PTR_ERR(new_data);
1042 change = ue->tlv_data_size != size;
1043 if (!change)
1044 change = memcmp(ue->tlv_data, new_data, size);
1045 kfree(ue->tlv_data);
1046 ue->tlv_data = new_data;
1047 ue->tlv_data_size = size;
1048 } else {
1049 if (! ue->tlv_data_size || ! ue->tlv_data)
1050 return -ENXIO;
1051 if (size < ue->tlv_data_size)
1052 return -ENOSPC;
1053 if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size))
1054 return -EFAULT;
1055 }
1056 return change;
1057 }
1058
1059 static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol)
1060 {
1061 struct user_element *ue = kcontrol->private_data;
1062 if (ue->tlv_data)
1063 kfree(ue->tlv_data);
1064 kfree(ue);
1065 }
1066
1067 static int snd_ctl_elem_add(struct snd_ctl_file *file,
1068 struct snd_ctl_elem_info *info, int replace)
1069 {
1070 struct snd_card *card = file->card;
1071 struct snd_kcontrol kctl, *_kctl;
1072 unsigned int access;
1073 long private_size;
1074 struct user_element *ue;
1075 int idx, err;
1076
1077 if (card->user_ctl_count >= MAX_USER_CONTROLS)
1078 return -ENOMEM;
1079 if (info->count < 1)
1080 return -EINVAL;
1081 access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
1082 (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
1083 SNDRV_CTL_ELEM_ACCESS_INACTIVE|
1084 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE));
1085 info->id.numid = 0;
1086 memset(&kctl, 0, sizeof(kctl));
1087 down_write(&card->controls_rwsem);
1088 _kctl = snd_ctl_find_id(card, &info->id);
1089 err = 0;
1090 if (_kctl) {
1091 if (replace)
1092 err = snd_ctl_remove(card, _kctl);
1093 else
1094 err = -EBUSY;
1095 } else {
1096 if (replace)
1097 err = -ENOENT;
1098 }
1099 up_write(&card->controls_rwsem);
1100 if (err < 0)
1101 return err;
1102 memcpy(&kctl.id, &info->id, sizeof(info->id));
1103 kctl.count = info->owner ? info->owner : 1;
1104 access |= SNDRV_CTL_ELEM_ACCESS_USER;
1105 kctl.info = snd_ctl_elem_user_info;
1106 if (access & SNDRV_CTL_ELEM_ACCESS_READ)
1107 kctl.get = snd_ctl_elem_user_get;
1108 if (access & SNDRV_CTL_ELEM_ACCESS_WRITE)
1109 kctl.put = snd_ctl_elem_user_put;
1110 if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) {
1111 kctl.tlv.c = snd_ctl_elem_user_tlv;
1112 access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1113 }
1114 switch (info->type) {
1115 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
1116 case SNDRV_CTL_ELEM_TYPE_INTEGER:
1117 private_size = sizeof(long);
1118 if (info->count > 128)
1119 return -EINVAL;
1120 break;
1121 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
1122 private_size = sizeof(long long);
1123 if (info->count > 64)
1124 return -EINVAL;
1125 break;
1126 case SNDRV_CTL_ELEM_TYPE_BYTES:
1127 private_size = sizeof(unsigned char);
1128 if (info->count > 512)
1129 return -EINVAL;
1130 break;
1131 case SNDRV_CTL_ELEM_TYPE_IEC958:
1132 private_size = sizeof(struct snd_aes_iec958);
1133 if (info->count != 1)
1134 return -EINVAL;
1135 break;
1136 default:
1137 return -EINVAL;
1138 }
1139 private_size *= info->count;
1140 ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL);
1141 if (ue == NULL)
1142 return -ENOMEM;
1143 ue->info = *info;
1144 ue->info.access = 0;
1145 ue->elem_data = (char *)ue + sizeof(*ue);
1146 ue->elem_data_size = private_size;
1147 kctl.private_free = snd_ctl_elem_user_free;
1148 _kctl = snd_ctl_new(&kctl, access);
1149 if (_kctl == NULL) {
1150 kfree(ue);
1151 return -ENOMEM;
1152 }
1153 _kctl->private_data = ue;
1154 for (idx = 0; idx < _kctl->count; idx++)
1155 _kctl->vd[idx].owner = file;
1156 err = snd_ctl_add(card, _kctl);
1157 if (err < 0)
1158 return err;
1159
1160 down_write(&card->controls_rwsem);
1161 card->user_ctl_count++;
1162 up_write(&card->controls_rwsem);
1163
1164 return 0;
1165 }
1166
1167 static int snd_ctl_elem_add_user(struct snd_ctl_file *file,
1168 struct snd_ctl_elem_info __user *_info, int replace)
1169 {
1170 struct snd_ctl_elem_info info;
1171 if (copy_from_user(&info, _info, sizeof(info)))
1172 return -EFAULT;
1173 return snd_ctl_elem_add(file, &info, replace);
1174 }
1175
1176 static int snd_ctl_elem_remove(struct snd_ctl_file *file,
1177 struct snd_ctl_elem_id __user *_id)
1178 {
1179 struct snd_ctl_elem_id id;
1180
1181 if (copy_from_user(&id, _id, sizeof(id)))
1182 return -EFAULT;
1183 return snd_ctl_remove_user_ctl(file, &id);
1184 }
1185
1186 static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr)
1187 {
1188 int subscribe;
1189 if (get_user(subscribe, ptr))
1190 return -EFAULT;
1191 if (subscribe < 0) {
1192 subscribe = file->subscribed;
1193 if (put_user(subscribe, ptr))
1194 return -EFAULT;
1195 return 0;
1196 }
1197 if (subscribe) {
1198 file->subscribed = 1;
1199 return 0;
1200 } else if (file->subscribed) {
1201 snd_ctl_empty_read_queue(file);
1202 file->subscribed = 0;
1203 }
1204 return 0;
1205 }
1206
1207 static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file,
1208 struct snd_ctl_tlv __user *_tlv,
1209 int op_flag)
1210 {
1211 struct snd_card *card = file->card;
1212 struct snd_ctl_tlv tlv;
1213 struct snd_kcontrol *kctl;
1214 struct snd_kcontrol_volatile *vd;
1215 unsigned int len;
1216 int err = 0;
1217
1218 if (copy_from_user(&tlv, _tlv, sizeof(tlv)))
1219 return -EFAULT;
1220 if (tlv.length < sizeof(unsigned int) * 2)
1221 return -EINVAL;
1222 down_read(&card->controls_rwsem);
1223 kctl = snd_ctl_find_numid(card, tlv.numid);
1224 if (kctl == NULL) {
1225 err = -ENOENT;
1226 goto __kctl_end;
1227 }
1228 if (kctl->tlv.p == NULL) {
1229 err = -ENXIO;
1230 goto __kctl_end;
1231 }
1232 vd = &kctl->vd[tlv.numid - kctl->id.numid];
1233 if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) ||
1234 (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) ||
1235 (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) {
1236 err = -ENXIO;
1237 goto __kctl_end;
1238 }
1239 if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) {
1240 if (vd->owner != NULL && vd->owner != file) {
1241 err = -EPERM;
1242 goto __kctl_end;
1243 }
1244 err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv);
1245 if (err > 0) {
1246 up_read(&card->controls_rwsem);
1247 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id);
1248 return 0;
1249 }
1250 } else {
1251 if (op_flag) {
1252 err = -ENXIO;
1253 goto __kctl_end;
1254 }
1255 len = kctl->tlv.p[1] + 2 * sizeof(unsigned int);
1256 if (tlv.length < len) {
1257 err = -ENOMEM;
1258 goto __kctl_end;
1259 }
1260 if (copy_to_user(_tlv->tlv, kctl->tlv.p, len))
1261 err = -EFAULT;
1262 }
1263 __kctl_end:
1264 up_read(&card->controls_rwsem);
1265 return err;
1266 }
1267
1268 static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1269 {
1270 struct snd_ctl_file *ctl;
1271 struct snd_card *card;
1272 struct snd_kctl_ioctl *p;
1273 void __user *argp = (void __user *)arg;
1274 int __user *ip = argp;
1275 int err;
1276
1277 ctl = file->private_data;
1278 card = ctl->card;
1279 if (snd_BUG_ON(!card))
1280 return -ENXIO;
1281 switch (cmd) {
1282 case SNDRV_CTL_IOCTL_PVERSION:
1283 return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0;
1284 case SNDRV_CTL_IOCTL_CARD_INFO:
1285 return snd_ctl_card_info(card, ctl, cmd, argp);
1286 case SNDRV_CTL_IOCTL_ELEM_LIST:
1287 return snd_ctl_elem_list(card, argp);
1288 case SNDRV_CTL_IOCTL_ELEM_INFO:
1289 return snd_ctl_elem_info_user(ctl, argp);
1290 case SNDRV_CTL_IOCTL_ELEM_READ:
1291 return snd_ctl_elem_read_user(card, argp);
1292 case SNDRV_CTL_IOCTL_ELEM_WRITE:
1293 return snd_ctl_elem_write_user(ctl, argp);
1294 case SNDRV_CTL_IOCTL_ELEM_LOCK:
1295 return snd_ctl_elem_lock(ctl, argp);
1296 case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
1297 return snd_ctl_elem_unlock(ctl, argp);
1298 case SNDRV_CTL_IOCTL_ELEM_ADD:
1299 return snd_ctl_elem_add_user(ctl, argp, 0);
1300 case SNDRV_CTL_IOCTL_ELEM_REPLACE:
1301 return snd_ctl_elem_add_user(ctl, argp, 1);
1302 case SNDRV_CTL_IOCTL_ELEM_REMOVE:
1303 return snd_ctl_elem_remove(ctl, argp);
1304 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
1305 return snd_ctl_subscribe_events(ctl, ip);
1306 case SNDRV_CTL_IOCTL_TLV_READ:
1307 return snd_ctl_tlv_ioctl(ctl, argp, 0);
1308 case SNDRV_CTL_IOCTL_TLV_WRITE:
1309 return snd_ctl_tlv_ioctl(ctl, argp, 1);
1310 case SNDRV_CTL_IOCTL_TLV_COMMAND:
1311 return snd_ctl_tlv_ioctl(ctl, argp, -1);
1312 case SNDRV_CTL_IOCTL_POWER:
1313 return -ENOPROTOOPT;
1314 case SNDRV_CTL_IOCTL_POWER_STATE:
1315 #ifdef CONFIG_PM
1316 return put_user(card->power_state, ip) ? -EFAULT : 0;
1317 #else
1318 return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0;
1319 #endif
1320 }
1321 down_read(&snd_ioctl_rwsem);
1322 list_for_each_entry(p, &snd_control_ioctls, list) {
1323 err = p->fioctl(card, ctl, cmd, arg);
1324 if (err != -ENOIOCTLCMD) {
1325 up_read(&snd_ioctl_rwsem);
1326 return err;
1327 }
1328 }
1329 up_read(&snd_ioctl_rwsem);
1330 snd_printdd("unknown ioctl = 0x%x\n", cmd);
1331 return -ENOTTY;
1332 }
1333
1334 static ssize_t snd_ctl_read(struct file *file, char __user *buffer,
1335 size_t count, loff_t * offset)
1336 {
1337 struct snd_ctl_file *ctl;
1338 int err = 0;
1339 ssize_t result = 0;
1340
1341 ctl = file->private_data;
1342 if (snd_BUG_ON(!ctl || !ctl->card))
1343 return -ENXIO;
1344 if (!ctl->subscribed)
1345 return -EBADFD;
1346 if (count < sizeof(struct snd_ctl_event))
1347 return -EINVAL;
1348 spin_lock_irq(&ctl->read_lock);
1349 while (count >= sizeof(struct snd_ctl_event)) {
1350 struct snd_ctl_event ev;
1351 struct snd_kctl_event *kev;
1352 while (list_empty(&ctl->events)) {
1353 wait_queue_t wait;
1354 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1355 err = -EAGAIN;
1356 goto __end_lock;
1357 }
1358 init_waitqueue_entry(&wait, current);
1359 add_wait_queue(&ctl->change_sleep, &wait);
1360 set_current_state(TASK_INTERRUPTIBLE);
1361 spin_unlock_irq(&ctl->read_lock);
1362 schedule();
1363 remove_wait_queue(&ctl->change_sleep, &wait);
1364 if (signal_pending(current))
1365 return -ERESTARTSYS;
1366 spin_lock_irq(&ctl->read_lock);
1367 }
1368 kev = snd_kctl_event(ctl->events.next);
1369 ev.type = SNDRV_CTL_EVENT_ELEM;
1370 ev.data.elem.mask = kev->mask;
1371 ev.data.elem.id = kev->id;
1372 list_del(&kev->list);
1373 spin_unlock_irq(&ctl->read_lock);
1374 kfree(kev);
1375 if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) {
1376 err = -EFAULT;
1377 goto __end;
1378 }
1379 spin_lock_irq(&ctl->read_lock);
1380 buffer += sizeof(struct snd_ctl_event);
1381 count -= sizeof(struct snd_ctl_event);
1382 result += sizeof(struct snd_ctl_event);
1383 }
1384 __end_lock:
1385 spin_unlock_irq(&ctl->read_lock);
1386 __end:
1387 return result > 0 ? result : err;
1388 }
1389
1390 static unsigned int snd_ctl_poll(struct file *file, poll_table * wait)
1391 {
1392 unsigned int mask;
1393 struct snd_ctl_file *ctl;
1394
1395 ctl = file->private_data;
1396 if (!ctl->subscribed)
1397 return 0;
1398 poll_wait(file, &ctl->change_sleep, wait);
1399
1400 mask = 0;
1401 if (!list_empty(&ctl->events))
1402 mask |= POLLIN | POLLRDNORM;
1403
1404 return mask;
1405 }
1406
1407 /*
1408 * register the device-specific control-ioctls.
1409 * called from each device manager like pcm.c, hwdep.c, etc.
1410 */
1411 static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists)
1412 {
1413 struct snd_kctl_ioctl *pn;
1414
1415 pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL);
1416 if (pn == NULL)
1417 return -ENOMEM;
1418 pn->fioctl = fcn;
1419 down_write(&snd_ioctl_rwsem);
1420 list_add_tail(&pn->list, lists);
1421 up_write(&snd_ioctl_rwsem);
1422 return 0;
1423 }
1424
1425 int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn)
1426 {
1427 return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls);
1428 }
1429
1430 EXPORT_SYMBOL(snd_ctl_register_ioctl);
1431
1432 #ifdef CONFIG_COMPAT
1433 int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1434 {
1435 return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls);
1436 }
1437
1438 EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
1439 #endif
1440
1441 /*
1442 * de-register the device-specific control-ioctls.
1443 */
1444 static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn,
1445 struct list_head *lists)
1446 {
1447 struct snd_kctl_ioctl *p;
1448
1449 if (snd_BUG_ON(!fcn))
1450 return -EINVAL;
1451 down_write(&snd_ioctl_rwsem);
1452 list_for_each_entry(p, lists, list) {
1453 if (p->fioctl == fcn) {
1454 list_del(&p->list);
1455 up_write(&snd_ioctl_rwsem);
1456 kfree(p);
1457 return 0;
1458 }
1459 }
1460 up_write(&snd_ioctl_rwsem);
1461 snd_BUG();
1462 return -EINVAL;
1463 }
1464
1465 int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn)
1466 {
1467 return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls);
1468 }
1469
1470 EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
1471
1472 #ifdef CONFIG_COMPAT
1473 int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1474 {
1475 return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls);
1476 }
1477
1478 EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
1479 #endif
1480
1481 static int snd_ctl_fasync(int fd, struct file * file, int on)
1482 {
1483 struct snd_ctl_file *ctl;
1484
1485 ctl = file->private_data;
1486 return fasync_helper(fd, file, on, &ctl->fasync);
1487 }
1488
1489 /*
1490 * ioctl32 compat
1491 */
1492 #ifdef CONFIG_COMPAT
1493 #include "control_compat.c"
1494 #else
1495 #define snd_ctl_ioctl_compat NULL
1496 #endif
1497
1498 /*
1499 * INIT PART
1500 */
1501
1502 static const struct file_operations snd_ctl_f_ops =
1503 {
1504 .owner = THIS_MODULE,
1505 .read = snd_ctl_read,
1506 .open = snd_ctl_open,
1507 .release = snd_ctl_release,
1508 .llseek = no_llseek,
1509 .poll = snd_ctl_poll,
1510 .unlocked_ioctl = snd_ctl_ioctl,
1511 .compat_ioctl = snd_ctl_ioctl_compat,
1512 .fasync = snd_ctl_fasync,
1513 };
1514
1515 /*
1516 * registration of the control device
1517 */
1518 static int snd_ctl_dev_register(struct snd_device *device)
1519 {
1520 struct snd_card *card = device->device_data;
1521 int err, cardnum;
1522 char name[16];
1523
1524 if (snd_BUG_ON(!card))
1525 return -ENXIO;
1526 cardnum = card->number;
1527 if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1528 return -ENXIO;
1529 sprintf(name, "controlC%i", cardnum);
1530 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
1531 &snd_ctl_f_ops, card, name)) < 0)
1532 return err;
1533 return 0;
1534 }
1535
1536 /*
1537 * disconnection of the control device
1538 */
1539 static int snd_ctl_dev_disconnect(struct snd_device *device)
1540 {
1541 struct snd_card *card = device->device_data;
1542 struct snd_ctl_file *ctl;
1543 int err, cardnum;
1544
1545 if (snd_BUG_ON(!card))
1546 return -ENXIO;
1547 cardnum = card->number;
1548 if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1549 return -ENXIO;
1550
1551 read_lock(&card->ctl_files_rwlock);
1552 list_for_each_entry(ctl, &card->ctl_files, list) {
1553 wake_up(&ctl->change_sleep);
1554 kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);
1555 }
1556 read_unlock(&card->ctl_files_rwlock);
1557
1558 if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL,
1559 card, -1)) < 0)
1560 return err;
1561 return 0;
1562 }
1563
1564 /*
1565 * free all controls
1566 */
1567 static int snd_ctl_dev_free(struct snd_device *device)
1568 {
1569 struct snd_card *card = device->device_data;
1570 struct snd_kcontrol *control;
1571
1572 down_write(&card->controls_rwsem);
1573 while (!list_empty(&card->controls)) {
1574 control = snd_kcontrol(card->controls.next);
1575 snd_ctl_remove(card, control);
1576 }
1577 up_write(&card->controls_rwsem);
1578 return 0;
1579 }
1580
1581 /*
1582 * create control core:
1583 * called from init.c
1584 */
1585 int snd_ctl_create(struct snd_card *card)
1586 {
1587 static struct snd_device_ops ops = {
1588 .dev_free = snd_ctl_dev_free,
1589 .dev_register = snd_ctl_dev_register,
1590 .dev_disconnect = snd_ctl_dev_disconnect,
1591 };
1592
1593 if (snd_BUG_ON(!card))
1594 return -ENXIO;
1595 return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);
1596 }
1597
1598 /*
1599 * Frequently used control callbacks/helpers
1600 */
1601 int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
1602 struct snd_ctl_elem_info *uinfo)
1603 {
1604 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1605 uinfo->count = 1;
1606 uinfo->value.integer.min = 0;
1607 uinfo->value.integer.max = 1;
1608 return 0;
1609 }
1610
1611 EXPORT_SYMBOL(snd_ctl_boolean_mono_info);
1612
1613 int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
1614 struct snd_ctl_elem_info *uinfo)
1615 {
1616 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1617 uinfo->count = 2;
1618 uinfo->value.integer.min = 0;
1619 uinfo->value.integer.max = 1;
1620 return 0;
1621 }
1622
1623 EXPORT_SYMBOL(snd_ctl_boolean_stereo_info);
1624
1625 /**
1626 * snd_ctl_enum_info - fills the info structure for an enumerated control
1627 * @info: the structure to be filled
1628 * @channels: the number of the control's channels; often one
1629 * @items: the number of control values; also the size of @names
1630 * @names: an array containing the names of all control values
1631 *
1632 * Sets all required fields in @info to their appropriate values.
1633 * If the control's accessibility is not the default (readable and writable),
1634 * the caller has to fill @info->access.
1635 */
1636 int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels,
1637 unsigned int items, const char *const names[])
1638 {
1639 info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
1640 info->count = channels;
1641 info->value.enumerated.items = items;
1642 if (info->value.enumerated.item >= items)
1643 info->value.enumerated.item = items - 1;
1644 strlcpy(info->value.enumerated.name,
1645 names[info->value.enumerated.item],
1646 sizeof(info->value.enumerated.name));
1647 return 0;
1648 }
1649 EXPORT_SYMBOL(snd_ctl_enum_info);
Linux 2.6 libata-dev (mirror)