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22#include <linux/threads.h>
23#include <linux/interrupt.h>
24#include <linux/module.h>
25#include <linux/slab.h>
26#include <linux/vmalloc.h>
27#include <linux/time.h>
28#include <sound/core.h>
29#include <sound/minors.h>
30#include <sound/info.h>
31#include <sound/control.h>
32
33
34#define MAX_USER_CONTROLS 32
35#define MAX_CONTROL_COUNT 1028
36
37struct snd_kctl_ioctl {
38 struct list_head list;
39 snd_kctl_ioctl_func_t fioctl;
40};
41
42static DECLARE_RWSEM(snd_ioctl_rwsem);
43static LIST_HEAD(snd_control_ioctls);
44#ifdef CONFIG_COMPAT
45static LIST_HEAD(snd_control_compat_ioctls);
46#endif
47
48static int snd_ctl_open(struct inode *inode, struct file *file)
49{
50 unsigned long flags;
51 struct snd_card *card;
52 struct snd_ctl_file *ctl;
53 int i, err;
54
55 err = nonseekable_open(inode, file);
56 if (err < 0)
57 return err;
58
59 card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL);
60 if (!card) {
61 err = -ENODEV;
62 goto __error1;
63 }
64 err = snd_card_file_add(card, file);
65 if (err < 0) {
66 err = -ENODEV;
67 goto __error1;
68 }
69 if (!try_module_get(card->module)) {
70 err = -EFAULT;
71 goto __error2;
72 }
73 ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
74 if (ctl == NULL) {
75 err = -ENOMEM;
76 goto __error;
77 }
78 INIT_LIST_HEAD(&ctl->events);
79 init_waitqueue_head(&ctl->change_sleep);
80 spin_lock_init(&ctl->read_lock);
81 ctl->card = card;
82 for (i = 0; i < SND_CTL_SUBDEV_ITEMS; i++)
83 ctl->preferred_subdevice[i] = -1;
84 ctl->pid = get_pid(task_pid(current));
85 file->private_data = ctl;
86 write_lock_irqsave(&card->ctl_files_rwlock, flags);
87 list_add_tail(&ctl->list, &card->ctl_files);
88 write_unlock_irqrestore(&card->ctl_files_rwlock, flags);
89 snd_card_unref(card);
90 return 0;
91
92 __error:
93 module_put(card->module);
94 __error2:
95 snd_card_file_remove(card, file);
96 __error1:
97 if (card)
98 snd_card_unref(card);
99 return err;
100}
101
102static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl)
103{
104 unsigned long flags;
105 struct snd_kctl_event *cread;
106
107 spin_lock_irqsave(&ctl->read_lock, flags);
108 while (!list_empty(&ctl->events)) {
109 cread = snd_kctl_event(ctl->events.next);
110 list_del(&cread->list);
111 kfree(cread);
112 }
113 spin_unlock_irqrestore(&ctl->read_lock, flags);
114}
115
116static int snd_ctl_release(struct inode *inode, struct file *file)
117{
118 unsigned long flags;
119 struct snd_card *card;
120 struct snd_ctl_file *ctl;
121 struct snd_kcontrol *control;
122 unsigned int idx;
123
124 ctl = file->private_data;
125 file->private_data = NULL;
126 card = ctl->card;
127 write_lock_irqsave(&card->ctl_files_rwlock, flags);
128 list_del(&ctl->list);
129 write_unlock_irqrestore(&card->ctl_files_rwlock, flags);
130 down_write(&card->controls_rwsem);
131 list_for_each_entry(control, &card->controls, list)
132 for (idx = 0; idx < control->count; idx++)
133 if (control->vd[idx].owner == ctl)
134 control->vd[idx].owner = NULL;
135 up_write(&card->controls_rwsem);
136 snd_ctl_empty_read_queue(ctl);
137 put_pid(ctl->pid);
138 kfree(ctl);
139 module_put(card->module);
140 snd_card_file_remove(card, file);
141 return 0;
142}
143
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151
152
153
154void snd_ctl_notify(struct snd_card *card, unsigned int mask,
155 struct snd_ctl_elem_id *id)
156{
157 unsigned long flags;
158 struct snd_ctl_file *ctl;
159 struct snd_kctl_event *ev;
160
161 if (snd_BUG_ON(!card || !id))
162 return;
163 if (card->shutdown)
164 return;
165 read_lock(&card->ctl_files_rwlock);
166#if IS_ENABLED(CONFIG_SND_MIXER_OSS)
167 card->mixer_oss_change_count++;
168#endif
169 list_for_each_entry(ctl, &card->ctl_files, list) {
170 if (!ctl->subscribed)
171 continue;
172 spin_lock_irqsave(&ctl->read_lock, flags);
173 list_for_each_entry(ev, &ctl->events, list) {
174 if (ev->id.numid == id->numid) {
175 ev->mask |= mask;
176 goto _found;
177 }
178 }
179 ev = kzalloc(sizeof(*ev), GFP_ATOMIC);
180 if (ev) {
181 ev->id = *id;
182 ev->mask = mask;
183 list_add_tail(&ev->list, &ctl->events);
184 } else {
185 dev_err(card->dev, "No memory available to allocate event\n");
186 }
187 _found:
188 wake_up(&ctl->change_sleep);
189 spin_unlock_irqrestore(&ctl->read_lock, flags);
190 kill_fasync(&ctl->fasync, SIGIO, POLL_IN);
191 }
192 read_unlock(&card->ctl_files_rwlock);
193}
194EXPORT_SYMBOL(snd_ctl_notify);
195
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207
208
209static int snd_ctl_new(struct snd_kcontrol **kctl, unsigned int count,
210 unsigned int access, struct snd_ctl_file *file)
211{
212 unsigned int size;
213 unsigned int idx;
214
215 if (count == 0 || count > MAX_CONTROL_COUNT)
216 return -EINVAL;
217
218 size = sizeof(struct snd_kcontrol);
219 size += sizeof(struct snd_kcontrol_volatile) * count;
220
221 *kctl = kzalloc(size, GFP_KERNEL);
222 if (!*kctl)
223 return -ENOMEM;
224
225 for (idx = 0; idx < count; idx++) {
226 (*kctl)->vd[idx].access = access;
227 (*kctl)->vd[idx].owner = file;
228 }
229 (*kctl)->count = count;
230
231 return 0;
232}
233
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242
243
244
245struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol,
246 void *private_data)
247{
248 struct snd_kcontrol *kctl;
249 unsigned int count;
250 unsigned int access;
251 int err;
252
253 if (snd_BUG_ON(!ncontrol || !ncontrol->info))
254 return NULL;
255
256 count = ncontrol->count;
257 if (count == 0)
258 count = 1;
259
260 access = ncontrol->access;
261 if (access == 0)
262 access = SNDRV_CTL_ELEM_ACCESS_READWRITE;
263 access &= (SNDRV_CTL_ELEM_ACCESS_READWRITE |
264 SNDRV_CTL_ELEM_ACCESS_VOLATILE |
265 SNDRV_CTL_ELEM_ACCESS_INACTIVE |
266 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE |
267 SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND |
268 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
269
270 err = snd_ctl_new(&kctl, count, access, NULL);
271 if (err < 0)
272 return NULL;
273
274
275 kctl->id.iface = ncontrol->iface;
276 kctl->id.device = ncontrol->device;
277 kctl->id.subdevice = ncontrol->subdevice;
278 if (ncontrol->name) {
279 strlcpy(kctl->id.name, ncontrol->name, sizeof(kctl->id.name));
280 if (strcmp(ncontrol->name, kctl->id.name) != 0)
281 pr_warn("ALSA: Control name '%s' truncated to '%s'\n",
282 ncontrol->name, kctl->id.name);
283 }
284 kctl->id.index = ncontrol->index;
285
286 kctl->info = ncontrol->info;
287 kctl->get = ncontrol->get;
288 kctl->put = ncontrol->put;
289 kctl->tlv.p = ncontrol->tlv.p;
290
291 kctl->private_value = ncontrol->private_value;
292 kctl->private_data = private_data;
293
294 return kctl;
295}
296EXPORT_SYMBOL(snd_ctl_new1);
297
298
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300
301
302
303
304
305
306void snd_ctl_free_one(struct snd_kcontrol *kcontrol)
307{
308 if (kcontrol) {
309 if (kcontrol->private_free)
310 kcontrol->private_free(kcontrol);
311 kfree(kcontrol);
312 }
313}
314EXPORT_SYMBOL(snd_ctl_free_one);
315
316static bool snd_ctl_remove_numid_conflict(struct snd_card *card,
317 unsigned int count)
318{
319 struct snd_kcontrol *kctl;
320
321
322 if (card->last_numid >= UINT_MAX - count)
323 card->last_numid = 0;
324
325 list_for_each_entry(kctl, &card->controls, list) {
326 if (kctl->id.numid < card->last_numid + 1 + count &&
327 kctl->id.numid + kctl->count > card->last_numid + 1) {
328 card->last_numid = kctl->id.numid + kctl->count - 1;
329 return true;
330 }
331 }
332 return false;
333}
334
335static int snd_ctl_find_hole(struct snd_card *card, unsigned int count)
336{
337 unsigned int iter = 100000;
338
339 while (snd_ctl_remove_numid_conflict(card, count)) {
340 if (--iter == 0) {
341
342 dev_err(card->dev, "unable to allocate new control numid\n");
343 return -ENOMEM;
344 }
345 }
346 return 0;
347}
348
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359
360
361
362
363int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
364{
365 struct snd_ctl_elem_id id;
366 unsigned int idx;
367 unsigned int count;
368 int err = -EINVAL;
369
370 if (! kcontrol)
371 return err;
372 if (snd_BUG_ON(!card || !kcontrol->info))
373 goto error;
374 id = kcontrol->id;
375 if (id.index > UINT_MAX - kcontrol->count)
376 goto error;
377
378 down_write(&card->controls_rwsem);
379 if (snd_ctl_find_id(card, &id)) {
380 up_write(&card->controls_rwsem);
381 dev_err(card->dev, "control %i:%i:%i:%s:%i is already present\n",
382 id.iface,
383 id.device,
384 id.subdevice,
385 id.name,
386 id.index);
387 err = -EBUSY;
388 goto error;
389 }
390 if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
391 up_write(&card->controls_rwsem);
392 err = -ENOMEM;
393 goto error;
394 }
395 list_add_tail(&kcontrol->list, &card->controls);
396 card->controls_count += kcontrol->count;
397 kcontrol->id.numid = card->last_numid + 1;
398 card->last_numid += kcontrol->count;
399 id = kcontrol->id;
400 count = kcontrol->count;
401 up_write(&card->controls_rwsem);
402 for (idx = 0; idx < count; idx++, id.index++, id.numid++)
403 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
404 return 0;
405
406 error:
407 snd_ctl_free_one(kcontrol);
408 return err;
409}
410EXPORT_SYMBOL(snd_ctl_add);
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424
425
426int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol,
427 bool add_on_replace)
428{
429 struct snd_ctl_elem_id id;
430 unsigned int count;
431 unsigned int idx;
432 struct snd_kcontrol *old;
433 int ret;
434
435 if (!kcontrol)
436 return -EINVAL;
437 if (snd_BUG_ON(!card || !kcontrol->info)) {
438 ret = -EINVAL;
439 goto error;
440 }
441 id = kcontrol->id;
442 down_write(&card->controls_rwsem);
443 old = snd_ctl_find_id(card, &id);
444 if (!old) {
445 if (add_on_replace)
446 goto add;
447 up_write(&card->controls_rwsem);
448 ret = -EINVAL;
449 goto error;
450 }
451 ret = snd_ctl_remove(card, old);
452 if (ret < 0) {
453 up_write(&card->controls_rwsem);
454 goto error;
455 }
456add:
457 if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
458 up_write(&card->controls_rwsem);
459 ret = -ENOMEM;
460 goto error;
461 }
462 list_add_tail(&kcontrol->list, &card->controls);
463 card->controls_count += kcontrol->count;
464 kcontrol->id.numid = card->last_numid + 1;
465 card->last_numid += kcontrol->count;
466 id = kcontrol->id;
467 count = kcontrol->count;
468 up_write(&card->controls_rwsem);
469 for (idx = 0; idx < count; idx++, id.index++, id.numid++)
470 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
471 return 0;
472
473error:
474 snd_ctl_free_one(kcontrol);
475 return ret;
476}
477EXPORT_SYMBOL(snd_ctl_replace);
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489
490int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol)
491{
492 struct snd_ctl_elem_id id;
493 unsigned int idx;
494
495 if (snd_BUG_ON(!card || !kcontrol))
496 return -EINVAL;
497 list_del(&kcontrol->list);
498 card->controls_count -= kcontrol->count;
499 id = kcontrol->id;
500 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
501 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id);
502 snd_ctl_free_one(kcontrol);
503 return 0;
504}
505EXPORT_SYMBOL(snd_ctl_remove);
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516
517int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id)
518{
519 struct snd_kcontrol *kctl;
520 int ret;
521
522 down_write(&card->controls_rwsem);
523 kctl = snd_ctl_find_id(card, id);
524 if (kctl == NULL) {
525 up_write(&card->controls_rwsem);
526 return -ENOENT;
527 }
528 ret = snd_ctl_remove(card, kctl);
529 up_write(&card->controls_rwsem);
530 return ret;
531}
532EXPORT_SYMBOL(snd_ctl_remove_id);
533
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543
544static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file,
545 struct snd_ctl_elem_id *id)
546{
547 struct snd_card *card = file->card;
548 struct snd_kcontrol *kctl;
549 int idx, ret;
550
551 down_write(&card->controls_rwsem);
552 kctl = snd_ctl_find_id(card, id);
553 if (kctl == NULL) {
554 ret = -ENOENT;
555 goto error;
556 }
557 if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) {
558 ret = -EINVAL;
559 goto error;
560 }
561 for (idx = 0; idx < kctl->count; idx++)
562 if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {
563 ret = -EBUSY;
564 goto error;
565 }
566 ret = snd_ctl_remove(card, kctl);
567 if (ret < 0)
568 goto error;
569 card->user_ctl_count--;
570error:
571 up_write(&card->controls_rwsem);
572 return ret;
573}
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586
587int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id,
588 int active)
589{
590 struct snd_kcontrol *kctl;
591 struct snd_kcontrol_volatile *vd;
592 unsigned int index_offset;
593 int ret;
594
595 down_write(&card->controls_rwsem);
596 kctl = snd_ctl_find_id(card, id);
597 if (kctl == NULL) {
598 ret = -ENOENT;
599 goto unlock;
600 }
601 index_offset = snd_ctl_get_ioff(kctl, id);
602 vd = &kctl->vd[index_offset];
603 ret = 0;
604 if (active) {
605 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE))
606 goto unlock;
607 vd->access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
608 } else {
609 if (vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)
610 goto unlock;
611 vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
612 }
613 snd_ctl_build_ioff(id, kctl, index_offset);
614 ret = 1;
615 unlock:
616 up_write(&card->controls_rwsem);
617 if (ret > 0)
618 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, id);
619 return ret;
620}
621EXPORT_SYMBOL_GPL(snd_ctl_activate_id);
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629
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631
632
633
634int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id,
635 struct snd_ctl_elem_id *dst_id)
636{
637 struct snd_kcontrol *kctl;
638
639 down_write(&card->controls_rwsem);
640 kctl = snd_ctl_find_id(card, src_id);
641 if (kctl == NULL) {
642 up_write(&card->controls_rwsem);
643 return -ENOENT;
644 }
645 kctl->id = *dst_id;
646 kctl->id.numid = card->last_numid + 1;
647 card->last_numid += kctl->count;
648 up_write(&card->controls_rwsem);
649 return 0;
650}
651EXPORT_SYMBOL(snd_ctl_rename_id);
652
653
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664
665
666struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid)
667{
668 struct snd_kcontrol *kctl;
669
670 if (snd_BUG_ON(!card || !numid))
671 return NULL;
672 list_for_each_entry(kctl, &card->controls, list) {
673 if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid)
674 return kctl;
675 }
676 return NULL;
677}
678EXPORT_SYMBOL(snd_ctl_find_numid);
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691
692
693struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card,
694 struct snd_ctl_elem_id *id)
695{
696 struct snd_kcontrol *kctl;
697
698 if (snd_BUG_ON(!card || !id))
699 return NULL;
700 if (id->numid != 0)
701 return snd_ctl_find_numid(card, id->numid);
702 list_for_each_entry(kctl, &card->controls, list) {
703 if (kctl->id.iface != id->iface)
704 continue;
705 if (kctl->id.device != id->device)
706 continue;
707 if (kctl->id.subdevice != id->subdevice)
708 continue;
709 if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name)))
710 continue;
711 if (kctl->id.index > id->index)
712 continue;
713 if (kctl->id.index + kctl->count <= id->index)
714 continue;
715 return kctl;
716 }
717 return NULL;
718}
719EXPORT_SYMBOL(snd_ctl_find_id);
720
721static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,
722 unsigned int cmd, void __user *arg)
723{
724 struct snd_ctl_card_info *info;
725
726 info = kzalloc(sizeof(*info), GFP_KERNEL);
727 if (! info)
728 return -ENOMEM;
729 down_read(&snd_ioctl_rwsem);
730 info->card = card->number;
731 strlcpy(info->id, card->id, sizeof(info->id));
732 strlcpy(info->driver, card->driver, sizeof(info->driver));
733 strlcpy(info->name, card->shortname, sizeof(info->name));
734 strlcpy(info->longname, card->longname, sizeof(info->longname));
735 strlcpy(info->mixername, card->mixername, sizeof(info->mixername));
736 strlcpy(info->components, card->components, sizeof(info->components));
737 up_read(&snd_ioctl_rwsem);
738 if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) {
739 kfree(info);
740 return -EFAULT;
741 }
742 kfree(info);
743 return 0;
744}
745
746static int snd_ctl_elem_list(struct snd_card *card,
747 struct snd_ctl_elem_list __user *_list)
748{
749 struct list_head *plist;
750 struct snd_ctl_elem_list list;
751 struct snd_kcontrol *kctl;
752 struct snd_ctl_elem_id *dst, *id;
753 unsigned int offset, space, jidx;
754
755 if (copy_from_user(&list, _list, sizeof(list)))
756 return -EFAULT;
757 offset = list.offset;
758 space = list.space;
759
760 if (space > 16384)
761 return -ENOMEM;
762 if (space > 0) {
763
764 dst = vmalloc(space * sizeof(struct snd_ctl_elem_id));
765 if (dst == NULL)
766 return -ENOMEM;
767 down_read(&card->controls_rwsem);
768 list.count = card->controls_count;
769 plist = card->controls.next;
770 while (plist != &card->controls) {
771 if (offset == 0)
772 break;
773 kctl = snd_kcontrol(plist);
774 if (offset < kctl->count)
775 break;
776 offset -= kctl->count;
777 plist = plist->next;
778 }
779 list.used = 0;
780 id = dst;
781 while (space > 0 && plist != &card->controls) {
782 kctl = snd_kcontrol(plist);
783 for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) {
784 snd_ctl_build_ioff(id, kctl, jidx);
785 id++;
786 space--;
787 list.used++;
788 }
789 plist = plist->next;
790 offset = 0;
791 }
792 up_read(&card->controls_rwsem);
793 if (list.used > 0 &&
794 copy_to_user(list.pids, dst,
795 list.used * sizeof(struct snd_ctl_elem_id))) {
796 vfree(dst);
797 return -EFAULT;
798 }
799 vfree(dst);
800 } else {
801 down_read(&card->controls_rwsem);
802 list.count = card->controls_count;
803 up_read(&card->controls_rwsem);
804 }
805 if (copy_to_user(_list, &list, sizeof(list)))
806 return -EFAULT;
807 return 0;
808}
809
810static bool validate_element_member_dimension(struct snd_ctl_elem_info *info)
811{
812 unsigned int members;
813 unsigned int i;
814
815 if (info->dimen.d[0] == 0)
816 return true;
817
818 members = 1;
819 for (i = 0; i < ARRAY_SIZE(info->dimen.d); ++i) {
820 if (info->dimen.d[i] == 0)
821 break;
822 members *= info->dimen.d[i];
823
824
825
826
827
828 if (members > info->count)
829 return false;
830 }
831
832 for (++i; i < ARRAY_SIZE(info->dimen.d); ++i) {
833 if (info->dimen.d[i] > 0)
834 return false;
835 }
836
837 return members == info->count;
838}
839
840static int snd_ctl_elem_info(struct snd_ctl_file *ctl,
841 struct snd_ctl_elem_info *info)
842{
843 struct snd_card *card = ctl->card;
844 struct snd_kcontrol *kctl;
845 struct snd_kcontrol_volatile *vd;
846 unsigned int index_offset;
847 int result;
848
849 down_read(&card->controls_rwsem);
850 kctl = snd_ctl_find_id(card, &info->id);
851 if (kctl == NULL) {
852 up_read(&card->controls_rwsem);
853 return -ENOENT;
854 }
855#ifdef CONFIG_SND_DEBUG
856 info->access = 0;
857#endif
858 result = kctl->info(kctl, info);
859 if (result >= 0) {
860 snd_BUG_ON(info->access);
861 index_offset = snd_ctl_get_ioff(kctl, &info->id);
862 vd = &kctl->vd[index_offset];
863 snd_ctl_build_ioff(&info->id, kctl, index_offset);
864 info->access = vd->access;
865 if (vd->owner) {
866 info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK;
867 if (vd->owner == ctl)
868 info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER;
869 info->owner = pid_vnr(vd->owner->pid);
870 } else {
871 info->owner = -1;
872 }
873 }
874 up_read(&card->controls_rwsem);
875 return result;
876}
877
878static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,
879 struct snd_ctl_elem_info __user *_info)
880{
881 struct snd_ctl_elem_info info;
882 int result;
883
884 if (copy_from_user(&info, _info, sizeof(info)))
885 return -EFAULT;
886 snd_power_lock(ctl->card);
887 result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
888 if (result >= 0)
889 result = snd_ctl_elem_info(ctl, &info);
890 snd_power_unlock(ctl->card);
891 if (result >= 0)
892 if (copy_to_user(_info, &info, sizeof(info)))
893 return -EFAULT;
894 return result;
895}
896
897static int snd_ctl_elem_read(struct snd_card *card,
898 struct snd_ctl_elem_value *control)
899{
900 struct snd_kcontrol *kctl;
901 struct snd_kcontrol_volatile *vd;
902 unsigned int index_offset;
903 int result;
904
905 down_read(&card->controls_rwsem);
906 kctl = snd_ctl_find_id(card, &control->id);
907 if (kctl == NULL) {
908 result = -ENOENT;
909 } else {
910 index_offset = snd_ctl_get_ioff(kctl, &control->id);
911 vd = &kctl->vd[index_offset];
912 if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) &&
913 kctl->get != NULL) {
914 snd_ctl_build_ioff(&control->id, kctl, index_offset);
915 result = kctl->get(kctl, control);
916 } else
917 result = -EPERM;
918 }
919 up_read(&card->controls_rwsem);
920 return result;
921}
922
923static int snd_ctl_elem_read_user(struct snd_card *card,
924 struct snd_ctl_elem_value __user *_control)
925{
926 struct snd_ctl_elem_value *control;
927 int result;
928
929 control = memdup_user(_control, sizeof(*control));
930 if (IS_ERR(control))
931 return PTR_ERR(control);
932
933 snd_power_lock(card);
934 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
935 if (result >= 0)
936 result = snd_ctl_elem_read(card, control);
937 snd_power_unlock(card);
938 if (result >= 0)
939 if (copy_to_user(_control, control, sizeof(*control)))
940 result = -EFAULT;
941 kfree(control);
942 return result;
943}
944
945static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file,
946 struct snd_ctl_elem_value *control)
947{
948 struct snd_kcontrol *kctl;
949 struct snd_kcontrol_volatile *vd;
950 unsigned int index_offset;
951 int result;
952
953 down_read(&card->controls_rwsem);
954 kctl = snd_ctl_find_id(card, &control->id);
955 if (kctl == NULL) {
956 result = -ENOENT;
957 } else {
958 index_offset = snd_ctl_get_ioff(kctl, &control->id);
959 vd = &kctl->vd[index_offset];
960 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) ||
961 kctl->put == NULL ||
962 (file && vd->owner && vd->owner != file)) {
963 result = -EPERM;
964 } else {
965 snd_ctl_build_ioff(&control->id, kctl, index_offset);
966 result = kctl->put(kctl, control);
967 }
968 if (result > 0) {
969 struct snd_ctl_elem_id id = control->id;
970 up_read(&card->controls_rwsem);
971 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &id);
972 return 0;
973 }
974 }
975 up_read(&card->controls_rwsem);
976 return result;
977}
978
979static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
980 struct snd_ctl_elem_value __user *_control)
981{
982 struct snd_ctl_elem_value *control;
983 struct snd_card *card;
984 int result;
985
986 control = memdup_user(_control, sizeof(*control));
987 if (IS_ERR(control))
988 return PTR_ERR(control);
989
990 card = file->card;
991 snd_power_lock(card);
992 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
993 if (result >= 0)
994 result = snd_ctl_elem_write(card, file, control);
995 snd_power_unlock(card);
996 if (result >= 0)
997 if (copy_to_user(_control, control, sizeof(*control)))
998 result = -EFAULT;
999 kfree(control);
1000 return result;
1001}
1002
1003static int snd_ctl_elem_lock(struct snd_ctl_file *file,
1004 struct snd_ctl_elem_id __user *_id)
1005{
1006 struct snd_card *card = file->card;
1007 struct snd_ctl_elem_id id;
1008 struct snd_kcontrol *kctl;
1009 struct snd_kcontrol_volatile *vd;
1010 int result;
1011
1012 if (copy_from_user(&id, _id, sizeof(id)))
1013 return -EFAULT;
1014 down_write(&card->controls_rwsem);
1015 kctl = snd_ctl_find_id(card, &id);
1016 if (kctl == NULL) {
1017 result = -ENOENT;
1018 } else {
1019 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
1020 if (vd->owner != NULL)
1021 result = -EBUSY;
1022 else {
1023 vd->owner = file;
1024 result = 0;
1025 }
1026 }
1027 up_write(&card->controls_rwsem);
1028 return result;
1029}
1030
1031static int snd_ctl_elem_unlock(struct snd_ctl_file *file,
1032 struct snd_ctl_elem_id __user *_id)
1033{
1034 struct snd_card *card = file->card;
1035 struct snd_ctl_elem_id id;
1036 struct snd_kcontrol *kctl;
1037 struct snd_kcontrol_volatile *vd;
1038 int result;
1039
1040 if (copy_from_user(&id, _id, sizeof(id)))
1041 return -EFAULT;
1042 down_write(&card->controls_rwsem);
1043 kctl = snd_ctl_find_id(card, &id);
1044 if (kctl == NULL) {
1045 result = -ENOENT;
1046 } else {
1047 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
1048 if (vd->owner == NULL)
1049 result = -EINVAL;
1050 else if (vd->owner != file)
1051 result = -EPERM;
1052 else {
1053 vd->owner = NULL;
1054 result = 0;
1055 }
1056 }
1057 up_write(&card->controls_rwsem);
1058 return result;
1059}
1060
1061struct user_element {
1062 struct snd_ctl_elem_info info;
1063 struct snd_card *card;
1064 char *elem_data;
1065 unsigned long elem_data_size;
1066 void *tlv_data;
1067 unsigned long tlv_data_size;
1068 void *priv_data;
1069};
1070
1071static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol,
1072 struct snd_ctl_elem_info *uinfo)
1073{
1074 struct user_element *ue = kcontrol->private_data;
1075 unsigned int offset;
1076
1077 offset = snd_ctl_get_ioff(kcontrol, &uinfo->id);
1078 *uinfo = ue->info;
1079 snd_ctl_build_ioff(&uinfo->id, kcontrol, offset);
1080
1081 return 0;
1082}
1083
1084static int snd_ctl_elem_user_enum_info(struct snd_kcontrol *kcontrol,
1085 struct snd_ctl_elem_info *uinfo)
1086{
1087 struct user_element *ue = kcontrol->private_data;
1088 const char *names;
1089 unsigned int item;
1090 unsigned int offset;
1091
1092 item = uinfo->value.enumerated.item;
1093
1094 offset = snd_ctl_get_ioff(kcontrol, &uinfo->id);
1095 *uinfo = ue->info;
1096 snd_ctl_build_ioff(&uinfo->id, kcontrol, offset);
1097
1098 item = min(item, uinfo->value.enumerated.items - 1);
1099 uinfo->value.enumerated.item = item;
1100
1101 names = ue->priv_data;
1102 for (; item > 0; --item)
1103 names += strlen(names) + 1;
1104 strcpy(uinfo->value.enumerated.name, names);
1105
1106 return 0;
1107}
1108
1109static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol,
1110 struct snd_ctl_elem_value *ucontrol)
1111{
1112 struct user_element *ue = kcontrol->private_data;
1113 unsigned int size = ue->elem_data_size;
1114 char *src = ue->elem_data +
1115 snd_ctl_get_ioff(kcontrol, &ucontrol->id) * size;
1116
1117 mutex_lock(&ue->card->user_ctl_lock);
1118 memcpy(&ucontrol->value, src, size);
1119 mutex_unlock(&ue->card->user_ctl_lock);
1120 return 0;
1121}
1122
1123static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol,
1124 struct snd_ctl_elem_value *ucontrol)
1125{
1126 int change;
1127 struct user_element *ue = kcontrol->private_data;
1128 unsigned int size = ue->elem_data_size;
1129 char *dst = ue->elem_data +
1130 snd_ctl_get_ioff(kcontrol, &ucontrol->id) * size;
1131
1132 mutex_lock(&ue->card->user_ctl_lock);
1133 change = memcmp(&ucontrol->value, dst, size) != 0;
1134 if (change)
1135 memcpy(dst, &ucontrol->value, size);
1136 mutex_unlock(&ue->card->user_ctl_lock);
1137 return change;
1138}
1139
1140static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol,
1141 int op_flag,
1142 unsigned int size,
1143 unsigned int __user *tlv)
1144{
1145 struct user_element *ue = kcontrol->private_data;
1146 int change = 0;
1147 void *new_data;
1148
1149 if (op_flag == SNDRV_CTL_TLV_OP_WRITE) {
1150 if (size > 1024 * 128)
1151 return -EINVAL;
1152
1153 new_data = memdup_user(tlv, size);
1154 if (IS_ERR(new_data))
1155 return PTR_ERR(new_data);
1156 mutex_lock(&ue->card->user_ctl_lock);
1157 change = ue->tlv_data_size != size;
1158 if (!change)
1159 change = memcmp(ue->tlv_data, new_data, size);
1160 kfree(ue->tlv_data);
1161 ue->tlv_data = new_data;
1162 ue->tlv_data_size = size;
1163 mutex_unlock(&ue->card->user_ctl_lock);
1164 } else {
1165 int ret = 0;
1166
1167 mutex_lock(&ue->card->user_ctl_lock);
1168 if (!ue->tlv_data_size || !ue->tlv_data) {
1169 ret = -ENXIO;
1170 goto err_unlock;
1171 }
1172 if (size < ue->tlv_data_size) {
1173 ret = -ENOSPC;
1174 goto err_unlock;
1175 }
1176 if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size))
1177 ret = -EFAULT;
1178err_unlock:
1179 mutex_unlock(&ue->card->user_ctl_lock);
1180 if (ret)
1181 return ret;
1182 }
1183 return change;
1184}
1185
1186static int snd_ctl_elem_init_enum_names(struct user_element *ue)
1187{
1188 char *names, *p;
1189 size_t buf_len, name_len;
1190 unsigned int i;
1191 const uintptr_t user_ptrval = ue->info.value.enumerated.names_ptr;
1192
1193 if (ue->info.value.enumerated.names_length > 64 * 1024)
1194 return -EINVAL;
1195
1196 names = memdup_user((const void __user *)user_ptrval,
1197 ue->info.value.enumerated.names_length);
1198 if (IS_ERR(names))
1199 return PTR_ERR(names);
1200
1201
1202 buf_len = ue->info.value.enumerated.names_length;
1203 p = names;
1204 for (i = 0; i < ue->info.value.enumerated.items; ++i) {
1205 name_len = strnlen(p, buf_len);
1206 if (name_len == 0 || name_len >= 64 || name_len == buf_len) {
1207 kfree(names);
1208 return -EINVAL;
1209 }
1210 p += name_len + 1;
1211 buf_len -= name_len + 1;
1212 }
1213
1214 ue->priv_data = names;
1215 ue->info.value.enumerated.names_ptr = 0;
1216
1217 return 0;
1218}
1219
1220static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol)
1221{
1222 struct user_element *ue = kcontrol->private_data;
1223
1224 kfree(ue->tlv_data);
1225 kfree(ue->priv_data);
1226 kfree(ue);
1227}
1228
1229static int snd_ctl_elem_add(struct snd_ctl_file *file,
1230 struct snd_ctl_elem_info *info, int replace)
1231{
1232
1233 static const unsigned int value_sizes[] = {
1234 [SNDRV_CTL_ELEM_TYPE_BOOLEAN] = sizeof(long),
1235 [SNDRV_CTL_ELEM_TYPE_INTEGER] = sizeof(long),
1236 [SNDRV_CTL_ELEM_TYPE_ENUMERATED] = sizeof(unsigned int),
1237 [SNDRV_CTL_ELEM_TYPE_BYTES] = sizeof(unsigned char),
1238 [SNDRV_CTL_ELEM_TYPE_IEC958] = sizeof(struct snd_aes_iec958),
1239 [SNDRV_CTL_ELEM_TYPE_INTEGER64] = sizeof(long long),
1240 };
1241 static const unsigned int max_value_counts[] = {
1242 [SNDRV_CTL_ELEM_TYPE_BOOLEAN] = 128,
1243 [SNDRV_CTL_ELEM_TYPE_INTEGER] = 128,
1244 [SNDRV_CTL_ELEM_TYPE_ENUMERATED] = 128,
1245 [SNDRV_CTL_ELEM_TYPE_BYTES] = 512,
1246 [SNDRV_CTL_ELEM_TYPE_IEC958] = 1,
1247 [SNDRV_CTL_ELEM_TYPE_INTEGER64] = 64,
1248 };
1249 struct snd_card *card = file->card;
1250 struct snd_kcontrol *kctl;
1251 unsigned int count;
1252 unsigned int access;
1253 long private_size;
1254 struct user_element *ue;
1255 unsigned int offset;
1256 int err;
1257
1258 if (!*info->id.name)
1259 return -EINVAL;
1260 if (strnlen(info->id.name, sizeof(info->id.name)) >= sizeof(info->id.name))
1261 return -EINVAL;
1262
1263
1264 if (replace) {
1265 info->id.numid = 0;
1266 err = snd_ctl_remove_user_ctl(file, &info->id);
1267 if (err)
1268 return err;
1269 }
1270
1271
1272
1273
1274
1275 if (card->user_ctl_count + 1 > MAX_USER_CONTROLS)
1276 return -ENOMEM;
1277
1278
1279 count = info->owner;
1280 if (count == 0)
1281 count = 1;
1282
1283
1284 access = info->access;
1285 if (access == 0)
1286 access = SNDRV_CTL_ELEM_ACCESS_READWRITE;
1287 access &= (SNDRV_CTL_ELEM_ACCESS_READWRITE |
1288 SNDRV_CTL_ELEM_ACCESS_INACTIVE |
1289 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE);
1290 if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE)
1291 access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1292 access |= SNDRV_CTL_ELEM_ACCESS_USER;
1293
1294
1295
1296
1297
1298 if (info->type < SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
1299 info->type > SNDRV_CTL_ELEM_TYPE_INTEGER64)
1300 return -EINVAL;
1301 if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED &&
1302 info->value.enumerated.items == 0)
1303 return -EINVAL;
1304 if (info->count < 1 ||
1305 info->count > max_value_counts[info->type])
1306 return -EINVAL;
1307 if (!validate_element_member_dimension(info))
1308 return -EINVAL;
1309 private_size = value_sizes[info->type] * info->count;
1310
1311
1312
1313
1314
1315
1316
1317 err = snd_ctl_new(&kctl, count, access, file);
1318 if (err < 0)
1319 return err;
1320 memcpy(&kctl->id, &info->id, sizeof(kctl->id));
1321 kctl->private_data = kzalloc(sizeof(struct user_element) + private_size * count,
1322 GFP_KERNEL);
1323 if (kctl->private_data == NULL) {
1324 kfree(kctl);
1325 return -ENOMEM;
1326 }
1327 kctl->private_free = snd_ctl_elem_user_free;
1328
1329
1330 ue = (struct user_element *)kctl->private_data;
1331 ue->card = card;
1332 ue->info = *info;
1333 ue->info.access = 0;
1334 ue->elem_data = (char *)ue + sizeof(*ue);
1335 ue->elem_data_size = private_size;
1336 if (ue->info.type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) {
1337 err = snd_ctl_elem_init_enum_names(ue);
1338 if (err < 0) {
1339 snd_ctl_free_one(kctl);
1340 return err;
1341 }
1342 }
1343
1344
1345 if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED)
1346 kctl->info = snd_ctl_elem_user_enum_info;
1347 else
1348 kctl->info = snd_ctl_elem_user_info;
1349 if (access & SNDRV_CTL_ELEM_ACCESS_READ)
1350 kctl->get = snd_ctl_elem_user_get;
1351 if (access & SNDRV_CTL_ELEM_ACCESS_WRITE)
1352 kctl->put = snd_ctl_elem_user_put;
1353 if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE)
1354 kctl->tlv.c = snd_ctl_elem_user_tlv;
1355
1356
1357 err = snd_ctl_add(card, kctl);
1358 if (err < 0)
1359 return err;
1360 offset = snd_ctl_get_ioff(kctl, &info->id);
1361 snd_ctl_build_ioff(&info->id, kctl, offset);
1362
1363
1364
1365
1366
1367
1368
1369
1370 down_write(&card->controls_rwsem);
1371 card->user_ctl_count++;
1372 up_write(&card->controls_rwsem);
1373
1374 return 0;
1375}
1376
1377static int snd_ctl_elem_add_user(struct snd_ctl_file *file,
1378 struct snd_ctl_elem_info __user *_info, int replace)
1379{
1380 struct snd_ctl_elem_info info;
1381 int err;
1382
1383 if (copy_from_user(&info, _info, sizeof(info)))
1384 return -EFAULT;
1385 err = snd_ctl_elem_add(file, &info, replace);
1386 if (err < 0)
1387 return err;
1388 if (copy_to_user(_info, &info, sizeof(info))) {
1389 snd_ctl_remove_user_ctl(file, &info.id);
1390 return -EFAULT;
1391 }
1392
1393 return 0;
1394}
1395
1396static int snd_ctl_elem_remove(struct snd_ctl_file *file,
1397 struct snd_ctl_elem_id __user *_id)
1398{
1399 struct snd_ctl_elem_id id;
1400
1401 if (copy_from_user(&id, _id, sizeof(id)))
1402 return -EFAULT;
1403 return snd_ctl_remove_user_ctl(file, &id);
1404}
1405
1406static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr)
1407{
1408 int subscribe;
1409 if (get_user(subscribe, ptr))
1410 return -EFAULT;
1411 if (subscribe < 0) {
1412 subscribe = file->subscribed;
1413 if (put_user(subscribe, ptr))
1414 return -EFAULT;
1415 return 0;
1416 }
1417 if (subscribe) {
1418 file->subscribed = 1;
1419 return 0;
1420 } else if (file->subscribed) {
1421 snd_ctl_empty_read_queue(file);
1422 file->subscribed = 0;
1423 }
1424 return 0;
1425}
1426
1427static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file,
1428 struct snd_ctl_tlv __user *_tlv,
1429 int op_flag)
1430{
1431 struct snd_card *card = file->card;
1432 struct snd_ctl_tlv tlv;
1433 struct snd_kcontrol *kctl;
1434 struct snd_kcontrol_volatile *vd;
1435 unsigned int len;
1436 int err = 0;
1437
1438 if (copy_from_user(&tlv, _tlv, sizeof(tlv)))
1439 return -EFAULT;
1440 if (tlv.length < sizeof(unsigned int) * 2)
1441 return -EINVAL;
1442 if (!tlv.numid)
1443 return -EINVAL;
1444 down_read(&card->controls_rwsem);
1445 kctl = snd_ctl_find_numid(card, tlv.numid);
1446 if (kctl == NULL) {
1447 err = -ENOENT;
1448 goto __kctl_end;
1449 }
1450 if (kctl->tlv.p == NULL) {
1451 err = -ENXIO;
1452 goto __kctl_end;
1453 }
1454 vd = &kctl->vd[tlv.numid - kctl->id.numid];
1455 if ((op_flag == SNDRV_CTL_TLV_OP_READ &&
1456 (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) ||
1457 (op_flag == SNDRV_CTL_TLV_OP_WRITE &&
1458 (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) ||
1459 (op_flag == SNDRV_CTL_TLV_OP_CMD &&
1460 (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) {
1461 err = -ENXIO;
1462 goto __kctl_end;
1463 }
1464 if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) {
1465 if (vd->owner != NULL && vd->owner != file) {
1466 err = -EPERM;
1467 goto __kctl_end;
1468 }
1469 err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv);
1470 if (err > 0) {
1471 struct snd_ctl_elem_id id = kctl->id;
1472 up_read(&card->controls_rwsem);
1473 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &id);
1474 return 0;
1475 }
1476 } else {
1477 if (op_flag != SNDRV_CTL_TLV_OP_READ) {
1478 err = -ENXIO;
1479 goto __kctl_end;
1480 }
1481 len = kctl->tlv.p[1] + 2 * sizeof(unsigned int);
1482 if (tlv.length < len) {
1483 err = -ENOMEM;
1484 goto __kctl_end;
1485 }
1486 if (copy_to_user(_tlv->tlv, kctl->tlv.p, len))
1487 err = -EFAULT;
1488 }
1489 __kctl_end:
1490 up_read(&card->controls_rwsem);
1491 return err;
1492}
1493
1494static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1495{
1496 struct snd_ctl_file *ctl;
1497 struct snd_card *card;
1498 struct snd_kctl_ioctl *p;
1499 void __user *argp = (void __user *)arg;
1500 int __user *ip = argp;
1501 int err;
1502
1503 ctl = file->private_data;
1504 card = ctl->card;
1505 if (snd_BUG_ON(!card))
1506 return -ENXIO;
1507 switch (cmd) {
1508 case SNDRV_CTL_IOCTL_PVERSION:
1509 return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0;
1510 case SNDRV_CTL_IOCTL_CARD_INFO:
1511 return snd_ctl_card_info(card, ctl, cmd, argp);
1512 case SNDRV_CTL_IOCTL_ELEM_LIST:
1513 return snd_ctl_elem_list(card, argp);
1514 case SNDRV_CTL_IOCTL_ELEM_INFO:
1515 return snd_ctl_elem_info_user(ctl, argp);
1516 case SNDRV_CTL_IOCTL_ELEM_READ:
1517 return snd_ctl_elem_read_user(card, argp);
1518 case SNDRV_CTL_IOCTL_ELEM_WRITE:
1519 return snd_ctl_elem_write_user(ctl, argp);
1520 case SNDRV_CTL_IOCTL_ELEM_LOCK:
1521 return snd_ctl_elem_lock(ctl, argp);
1522 case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
1523 return snd_ctl_elem_unlock(ctl, argp);
1524 case SNDRV_CTL_IOCTL_ELEM_ADD:
1525 return snd_ctl_elem_add_user(ctl, argp, 0);
1526 case SNDRV_CTL_IOCTL_ELEM_REPLACE:
1527 return snd_ctl_elem_add_user(ctl, argp, 1);
1528 case SNDRV_CTL_IOCTL_ELEM_REMOVE:
1529 return snd_ctl_elem_remove(ctl, argp);
1530 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
1531 return snd_ctl_subscribe_events(ctl, ip);
1532 case SNDRV_CTL_IOCTL_TLV_READ:
1533 return snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_READ);
1534 case SNDRV_CTL_IOCTL_TLV_WRITE:
1535 return snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_WRITE);
1536 case SNDRV_CTL_IOCTL_TLV_COMMAND:
1537 return snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_CMD);
1538 case SNDRV_CTL_IOCTL_POWER:
1539 return -ENOPROTOOPT;
1540 case SNDRV_CTL_IOCTL_POWER_STATE:
1541#ifdef CONFIG_PM
1542 return put_user(card->power_state, ip) ? -EFAULT : 0;
1543#else
1544 return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0;
1545#endif
1546 }
1547 down_read(&snd_ioctl_rwsem);
1548 list_for_each_entry(p, &snd_control_ioctls, list) {
1549 err = p->fioctl(card, ctl, cmd, arg);
1550 if (err != -ENOIOCTLCMD) {
1551 up_read(&snd_ioctl_rwsem);
1552 return err;
1553 }
1554 }
1555 up_read(&snd_ioctl_rwsem);
1556 dev_dbg(card->dev, "unknown ioctl = 0x%x\n", cmd);
1557 return -ENOTTY;
1558}
1559
1560static ssize_t snd_ctl_read(struct file *file, char __user *buffer,
1561 size_t count, loff_t * offset)
1562{
1563 struct snd_ctl_file *ctl;
1564 int err = 0;
1565 ssize_t result = 0;
1566
1567 ctl = file->private_data;
1568 if (snd_BUG_ON(!ctl || !ctl->card))
1569 return -ENXIO;
1570 if (!ctl->subscribed)
1571 return -EBADFD;
1572 if (count < sizeof(struct snd_ctl_event))
1573 return -EINVAL;
1574 spin_lock_irq(&ctl->read_lock);
1575 while (count >= sizeof(struct snd_ctl_event)) {
1576 struct snd_ctl_event ev;
1577 struct snd_kctl_event *kev;
1578 while (list_empty(&ctl->events)) {
1579 wait_queue_t wait;
1580 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1581 err = -EAGAIN;
1582 goto __end_lock;
1583 }
1584 init_waitqueue_entry(&wait, current);
1585 add_wait_queue(&ctl->change_sleep, &wait);
1586 set_current_state(TASK_INTERRUPTIBLE);
1587 spin_unlock_irq(&ctl->read_lock);
1588 schedule();
1589 remove_wait_queue(&ctl->change_sleep, &wait);
1590 if (ctl->card->shutdown)
1591 return -ENODEV;
1592 if (signal_pending(current))
1593 return -ERESTARTSYS;
1594 spin_lock_irq(&ctl->read_lock);
1595 }
1596 kev = snd_kctl_event(ctl->events.next);
1597 ev.type = SNDRV_CTL_EVENT_ELEM;
1598 ev.data.elem.mask = kev->mask;
1599 ev.data.elem.id = kev->id;
1600 list_del(&kev->list);
1601 spin_unlock_irq(&ctl->read_lock);
1602 kfree(kev);
1603 if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) {
1604 err = -EFAULT;
1605 goto __end;
1606 }
1607 spin_lock_irq(&ctl->read_lock);
1608 buffer += sizeof(struct snd_ctl_event);
1609 count -= sizeof(struct snd_ctl_event);
1610 result += sizeof(struct snd_ctl_event);
1611 }
1612 __end_lock:
1613 spin_unlock_irq(&ctl->read_lock);
1614 __end:
1615 return result > 0 ? result : err;
1616}
1617
1618static unsigned int snd_ctl_poll(struct file *file, poll_table * wait)
1619{
1620 unsigned int mask;
1621 struct snd_ctl_file *ctl;
1622
1623 ctl = file->private_data;
1624 if (!ctl->subscribed)
1625 return 0;
1626 poll_wait(file, &ctl->change_sleep, wait);
1627
1628 mask = 0;
1629 if (!list_empty(&ctl->events))
1630 mask |= POLLIN | POLLRDNORM;
1631
1632 return mask;
1633}
1634
1635
1636
1637
1638
1639static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists)
1640{
1641 struct snd_kctl_ioctl *pn;
1642
1643 pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL);
1644 if (pn == NULL)
1645 return -ENOMEM;
1646 pn->fioctl = fcn;
1647 down_write(&snd_ioctl_rwsem);
1648 list_add_tail(&pn->list, lists);
1649 up_write(&snd_ioctl_rwsem);
1650 return 0;
1651}
1652
1653
1654
1655
1656
1657
1658
1659int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn)
1660{
1661 return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls);
1662}
1663EXPORT_SYMBOL(snd_ctl_register_ioctl);
1664
1665#ifdef CONFIG_COMPAT
1666
1667
1668
1669
1670
1671int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1672{
1673 return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls);
1674}
1675EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
1676#endif
1677
1678
1679
1680
1681static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn,
1682 struct list_head *lists)
1683{
1684 struct snd_kctl_ioctl *p;
1685
1686 if (snd_BUG_ON(!fcn))
1687 return -EINVAL;
1688 down_write(&snd_ioctl_rwsem);
1689 list_for_each_entry(p, lists, list) {
1690 if (p->fioctl == fcn) {
1691 list_del(&p->list);
1692 up_write(&snd_ioctl_rwsem);
1693 kfree(p);
1694 return 0;
1695 }
1696 }
1697 up_write(&snd_ioctl_rwsem);
1698 snd_BUG();
1699 return -EINVAL;
1700}
1701
1702
1703
1704
1705
1706int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn)
1707{
1708 return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls);
1709}
1710EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
1711
1712#ifdef CONFIG_COMPAT
1713
1714
1715
1716
1717
1718int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1719{
1720 return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls);
1721}
1722EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
1723#endif
1724
1725static int snd_ctl_fasync(int fd, struct file * file, int on)
1726{
1727 struct snd_ctl_file *ctl;
1728
1729 ctl = file->private_data;
1730 return fasync_helper(fd, file, on, &ctl->fasync);
1731}
1732
1733
1734
1735
1736int snd_ctl_get_preferred_subdevice(struct snd_card *card, int type)
1737{
1738 struct snd_ctl_file *kctl;
1739 int subdevice = -1;
1740
1741 read_lock(&card->ctl_files_rwlock);
1742 list_for_each_entry(kctl, &card->ctl_files, list) {
1743 if (kctl->pid == task_pid(current)) {
1744 subdevice = kctl->preferred_subdevice[type];
1745 if (subdevice != -1)
1746 break;
1747 }
1748 }
1749 read_unlock(&card->ctl_files_rwlock);
1750 return subdevice;
1751}
1752EXPORT_SYMBOL_GPL(snd_ctl_get_preferred_subdevice);
1753
1754
1755
1756
1757#ifdef CONFIG_COMPAT
1758#include "control_compat.c"
1759#else
1760#define snd_ctl_ioctl_compat NULL
1761#endif
1762
1763
1764
1765
1766
1767static const struct file_operations snd_ctl_f_ops =
1768{
1769 .owner = THIS_MODULE,
1770 .read = snd_ctl_read,
1771 .open = snd_ctl_open,
1772 .release = snd_ctl_release,
1773 .llseek = no_llseek,
1774 .poll = snd_ctl_poll,
1775 .unlocked_ioctl = snd_ctl_ioctl,
1776 .compat_ioctl = snd_ctl_ioctl_compat,
1777 .fasync = snd_ctl_fasync,
1778};
1779
1780
1781
1782
1783static int snd_ctl_dev_register(struct snd_device *device)
1784{
1785 struct snd_card *card = device->device_data;
1786
1787 return snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
1788 &snd_ctl_f_ops, card, &card->ctl_dev);
1789}
1790
1791
1792
1793
1794static int snd_ctl_dev_disconnect(struct snd_device *device)
1795{
1796 struct snd_card *card = device->device_data;
1797 struct snd_ctl_file *ctl;
1798
1799 read_lock(&card->ctl_files_rwlock);
1800 list_for_each_entry(ctl, &card->ctl_files, list) {
1801 wake_up(&ctl->change_sleep);
1802 kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);
1803 }
1804 read_unlock(&card->ctl_files_rwlock);
1805
1806 return snd_unregister_device(&card->ctl_dev);
1807}
1808
1809
1810
1811
1812static int snd_ctl_dev_free(struct snd_device *device)
1813{
1814 struct snd_card *card = device->device_data;
1815 struct snd_kcontrol *control;
1816
1817 down_write(&card->controls_rwsem);
1818 while (!list_empty(&card->controls)) {
1819 control = snd_kcontrol(card->controls.next);
1820 snd_ctl_remove(card, control);
1821 }
1822 up_write(&card->controls_rwsem);
1823 put_device(&card->ctl_dev);
1824 return 0;
1825}
1826
1827
1828
1829
1830
1831int snd_ctl_create(struct snd_card *card)
1832{
1833 static struct snd_device_ops ops = {
1834 .dev_free = snd_ctl_dev_free,
1835 .dev_register = snd_ctl_dev_register,
1836 .dev_disconnect = snd_ctl_dev_disconnect,
1837 };
1838 int err;
1839
1840 if (snd_BUG_ON(!card))
1841 return -ENXIO;
1842 if (snd_BUG_ON(card->number < 0 || card->number >= SNDRV_CARDS))
1843 return -ENXIO;
1844
1845 snd_device_initialize(&card->ctl_dev, card);
1846 dev_set_name(&card->ctl_dev, "controlC%d", card->number);
1847
1848 err = snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);
1849 if (err < 0)
1850 put_device(&card->ctl_dev);
1851 return err;
1852}
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
1868 struct snd_ctl_elem_info *uinfo)
1869{
1870 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1871 uinfo->count = 1;
1872 uinfo->value.integer.min = 0;
1873 uinfo->value.integer.max = 1;
1874 return 0;
1875}
1876EXPORT_SYMBOL(snd_ctl_boolean_mono_info);
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
1888 struct snd_ctl_elem_info *uinfo)
1889{
1890 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1891 uinfo->count = 2;
1892 uinfo->value.integer.min = 0;
1893 uinfo->value.integer.max = 1;
1894 return 0;
1895}
1896EXPORT_SYMBOL(snd_ctl_boolean_stereo_info);
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels,
1912 unsigned int items, const char *const names[])
1913{
1914 info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
1915 info->count = channels;
1916 info->value.enumerated.items = items;
1917 if (!items)
1918 return 0;
1919 if (info->value.enumerated.item >= items)
1920 info->value.enumerated.item = items - 1;
1921 WARN(strlen(names[info->value.enumerated.item]) >= sizeof(info->value.enumerated.name),
1922 "ALSA: too long item name '%s'\n",
1923 names[info->value.enumerated.item]);
1924 strlcpy(info->value.enumerated.name,
1925 names[info->value.enumerated.item],
1926 sizeof(info->value.enumerated.name));
1927 return 0;
1928}
1929EXPORT_SYMBOL(snd_ctl_enum_info);
1930