183fab277b69632a5264c0bc98441abc8428ba0c
[platform/adaptation/renesas_rcar/renesas_kernel.git] / sound / core / control.c
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/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 /* max number of user-defined controls */
34 #define MAX_USER_CONTROLS       32
35 #define MAX_CONTROL_COUNT       1028
36
37 struct snd_kctl_ioctl {
38         struct list_head list;          /* list of all ioctls */
39         snd_kctl_ioctl_func_t fioctl;
40 };
41
42 static DECLARE_RWSEM(snd_ioctl_rwsem);
43 static LIST_HEAD(snd_control_ioctls);
44 #ifdef CONFIG_COMPAT
45 static LIST_HEAD(snd_control_compat_ioctls);
46 #endif
47
48 static 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 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         ctl->prefer_pcm_subdevice = -1;
83         ctl->prefer_rawmidi_subdevice = -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
102 static 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
116 static 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
144 void snd_ctl_notify(struct snd_card *card, unsigned int mask,
145                     struct snd_ctl_elem_id *id)
146 {
147         unsigned long flags;
148         struct snd_ctl_file *ctl;
149         struct snd_kctl_event *ev;
150         
151         if (snd_BUG_ON(!card || !id))
152                 return;
153         read_lock(&card->ctl_files_rwlock);
154 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
155         card->mixer_oss_change_count++;
156 #endif
157         list_for_each_entry(ctl, &card->ctl_files, list) {
158                 if (!ctl->subscribed)
159                         continue;
160                 spin_lock_irqsave(&ctl->read_lock, flags);
161                 list_for_each_entry(ev, &ctl->events, list) {
162                         if (ev->id.numid == id->numid) {
163                                 ev->mask |= mask;
164                                 goto _found;
165                         }
166                 }
167                 ev = kzalloc(sizeof(*ev), GFP_ATOMIC);
168                 if (ev) {
169                         ev->id = *id;
170                         ev->mask = mask;
171                         list_add_tail(&ev->list, &ctl->events);
172                 } else {
173                         snd_printk(KERN_ERR "No memory available to allocate event\n");
174                 }
175         _found:
176                 wake_up(&ctl->change_sleep);
177                 spin_unlock_irqrestore(&ctl->read_lock, flags);
178                 kill_fasync(&ctl->fasync, SIGIO, POLL_IN);
179         }
180         read_unlock(&card->ctl_files_rwlock);
181 }
182
183 EXPORT_SYMBOL(snd_ctl_notify);
184
185 /**
186  * snd_ctl_new - create a control instance from the template
187  * @control: the control template
188  * @access: the default control access
189  *
190  * Allocates a new struct snd_kcontrol instance and copies the given template 
191  * to the new instance. It does not copy volatile data (access).
192  *
193  * Return: The pointer of the new instance, or %NULL on failure.
194  */
195 static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control,
196                                         unsigned int access)
197 {
198         struct snd_kcontrol *kctl;
199         unsigned int idx;
200         
201         if (snd_BUG_ON(!control || !control->count))
202                 return NULL;
203
204         if (control->count > MAX_CONTROL_COUNT)
205                 return NULL;
206
207         kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL);
208         if (kctl == NULL) {
209                 snd_printk(KERN_ERR "Cannot allocate control instance\n");
210                 return NULL;
211         }
212         *kctl = *control;
213         for (idx = 0; idx < kctl->count; idx++)
214                 kctl->vd[idx].access = access;
215         return kctl;
216 }
217
218 /**
219  * snd_ctl_new1 - create a control instance from the template
220  * @ncontrol: the initialization record
221  * @private_data: the private data to set
222  *
223  * Allocates a new struct snd_kcontrol instance and initialize from the given 
224  * template.  When the access field of ncontrol is 0, it's assumed as
225  * READWRITE access. When the count field is 0, it's assumes as one.
226  *
227  * Return: The pointer of the newly generated instance, or %NULL on failure.
228  */
229 struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol,
230                                   void *private_data)
231 {
232         struct snd_kcontrol kctl;
233         unsigned int access;
234         
235         if (snd_BUG_ON(!ncontrol || !ncontrol->info))
236                 return NULL;
237         memset(&kctl, 0, sizeof(kctl));
238         kctl.id.iface = ncontrol->iface;
239         kctl.id.device = ncontrol->device;
240         kctl.id.subdevice = ncontrol->subdevice;
241         if (ncontrol->name) {
242                 strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name));
243                 if (strcmp(ncontrol->name, kctl.id.name) != 0)
244                         snd_printk(KERN_WARNING
245                                    "Control name '%s' truncated to '%s'\n",
246                                    ncontrol->name, kctl.id.name);
247         }
248         kctl.id.index = ncontrol->index;
249         kctl.count = ncontrol->count ? ncontrol->count : 1;
250         access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
251                  (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
252                                       SNDRV_CTL_ELEM_ACCESS_VOLATILE|
253                                       SNDRV_CTL_ELEM_ACCESS_INACTIVE|
254                                       SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE|
255                                       SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND|
256                                       SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK));
257         kctl.info = ncontrol->info;
258         kctl.get = ncontrol->get;
259         kctl.put = ncontrol->put;
260         kctl.tlv.p = ncontrol->tlv.p;
261         kctl.private_value = ncontrol->private_value;
262         kctl.private_data = private_data;
263         return snd_ctl_new(&kctl, access);
264 }
265
266 EXPORT_SYMBOL(snd_ctl_new1);
267
268 /**
269  * snd_ctl_free_one - release the control instance
270  * @kcontrol: the control instance
271  *
272  * Releases the control instance created via snd_ctl_new()
273  * or snd_ctl_new1().
274  * Don't call this after the control was added to the card.
275  */
276 void snd_ctl_free_one(struct snd_kcontrol *kcontrol)
277 {
278         if (kcontrol) {
279                 if (kcontrol->private_free)
280                         kcontrol->private_free(kcontrol);
281                 kfree(kcontrol);
282         }
283 }
284
285 EXPORT_SYMBOL(snd_ctl_free_one);
286
287 static bool snd_ctl_remove_numid_conflict(struct snd_card *card,
288                                           unsigned int count)
289 {
290         struct snd_kcontrol *kctl;
291
292         list_for_each_entry(kctl, &card->controls, list) {
293                 if (kctl->id.numid < card->last_numid + 1 + count &&
294                     kctl->id.numid + kctl->count > card->last_numid + 1) {
295                         card->last_numid = kctl->id.numid + kctl->count - 1;
296                         return true;
297                 }
298         }
299         return false;
300 }
301
302 static int snd_ctl_find_hole(struct snd_card *card, unsigned int count)
303 {
304         unsigned int iter = 100000;
305
306         while (snd_ctl_remove_numid_conflict(card, count)) {
307                 if (--iter == 0) {
308                         /* this situation is very unlikely */
309                         snd_printk(KERN_ERR "unable to allocate new control numid\n");
310                         return -ENOMEM;
311                 }
312         }
313         return 0;
314 }
315
316 /**
317  * snd_ctl_add - add the control instance to the card
318  * @card: the card instance
319  * @kcontrol: the control instance to add
320  *
321  * Adds the control instance created via snd_ctl_new() or
322  * snd_ctl_new1() to the given card. Assigns also an unique
323  * numid used for fast search.
324  *
325  * It frees automatically the control which cannot be added.
326  *
327  * Return: Zero if successful, or a negative error code on failure.
328  *
329  */
330 int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
331 {
332         struct snd_ctl_elem_id id;
333         unsigned int idx;
334         int err = -EINVAL;
335
336         if (! kcontrol)
337                 return err;
338         if (snd_BUG_ON(!card || !kcontrol->info))
339                 goto error;
340         id = kcontrol->id;
341         down_write(&card->controls_rwsem);
342         if (snd_ctl_find_id(card, &id)) {
343                 up_write(&card->controls_rwsem);
344                 snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n",
345                                         id.iface,
346                                         id.device,
347                                         id.subdevice,
348                                         id.name,
349                                         id.index);
350                 err = -EBUSY;
351                 goto error;
352         }
353         if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
354                 up_write(&card->controls_rwsem);
355                 err = -ENOMEM;
356                 goto error;
357         }
358         list_add_tail(&kcontrol->list, &card->controls);
359         card->controls_count += kcontrol->count;
360         kcontrol->id.numid = card->last_numid + 1;
361         card->last_numid += kcontrol->count;
362         up_write(&card->controls_rwsem);
363         for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
364                 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
365         return 0;
366
367  error:
368         snd_ctl_free_one(kcontrol);
369         return err;
370 }
371
372 EXPORT_SYMBOL(snd_ctl_add);
373
374 /**
375  * snd_ctl_replace - replace the control instance of the card
376  * @card: the card instance
377  * @kcontrol: the control instance to replace
378  * @add_on_replace: add the control if not already added
379  *
380  * Replaces the given control.  If the given control does not exist
381  * and the add_on_replace flag is set, the control is added.  If the
382  * control exists, it is destroyed first.
383  *
384  * It frees automatically the control which cannot be added or replaced.
385  *
386  * Return: Zero if successful, or a negative error code on failure.
387  */
388 int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol,
389                     bool add_on_replace)
390 {
391         struct snd_ctl_elem_id id;
392         unsigned int idx;
393         struct snd_kcontrol *old;
394         int ret;
395
396         if (!kcontrol)
397                 return -EINVAL;
398         if (snd_BUG_ON(!card || !kcontrol->info)) {
399                 ret = -EINVAL;
400                 goto error;
401         }
402         id = kcontrol->id;
403         down_write(&card->controls_rwsem);
404         old = snd_ctl_find_id(card, &id);
405         if (!old) {
406                 if (add_on_replace)
407                         goto add;
408                 up_write(&card->controls_rwsem);
409                 ret = -EINVAL;
410                 goto error;
411         }
412         ret = snd_ctl_remove(card, old);
413         if (ret < 0) {
414                 up_write(&card->controls_rwsem);
415                 goto error;
416         }
417 add:
418         if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
419                 up_write(&card->controls_rwsem);
420                 ret = -ENOMEM;
421                 goto error;
422         }
423         list_add_tail(&kcontrol->list, &card->controls);
424         card->controls_count += kcontrol->count;
425         kcontrol->id.numid = card->last_numid + 1;
426         card->last_numid += kcontrol->count;
427         up_write(&card->controls_rwsem);
428         for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
429                 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
430         return 0;
431
432 error:
433         snd_ctl_free_one(kcontrol);
434         return ret;
435 }
436 EXPORT_SYMBOL(snd_ctl_replace);
437
438 /**
439  * snd_ctl_remove - remove the control from the card and release it
440  * @card: the card instance
441  * @kcontrol: the control instance to remove
442  *
443  * Removes the control from the card and then releases the instance.
444  * You don't need to call snd_ctl_free_one(). You must be in
445  * the write lock - down_write(&card->controls_rwsem).
446  *
447  * Return: 0 if successful, or a negative error code on failure.
448  */
449 int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol)
450 {
451         struct snd_ctl_elem_id id;
452         unsigned int idx;
453
454         if (snd_BUG_ON(!card || !kcontrol))
455                 return -EINVAL;
456         list_del(&kcontrol->list);
457         card->controls_count -= kcontrol->count;
458         id = kcontrol->id;
459         for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
460                 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id);
461         snd_ctl_free_one(kcontrol);
462         return 0;
463 }
464
465 EXPORT_SYMBOL(snd_ctl_remove);
466
467 /**
468  * snd_ctl_remove_id - remove the control of the given id and release it
469  * @card: the card instance
470  * @id: the control id to remove
471  *
472  * Finds the control instance with the given id, removes it from the
473  * card list and releases it.
474  *
475  * Return: 0 if successful, or a negative error code on failure.
476  */
477 int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id)
478 {
479         struct snd_kcontrol *kctl;
480         int ret;
481
482         down_write(&card->controls_rwsem);
483         kctl = snd_ctl_find_id(card, id);
484         if (kctl == NULL) {
485                 up_write(&card->controls_rwsem);
486                 return -ENOENT;
487         }
488         ret = snd_ctl_remove(card, kctl);
489         up_write(&card->controls_rwsem);
490         return ret;
491 }
492
493 EXPORT_SYMBOL(snd_ctl_remove_id);
494
495 /**
496  * snd_ctl_remove_user_ctl - remove and release the unlocked user control
497  * @file: active control handle
498  * @id: the control id to remove
499  *
500  * Finds the control instance with the given id, removes it from the
501  * card list and releases it.
502  *
503  * Return: 0 if successful, or a negative error code on failure.
504  */
505 static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file,
506                                    struct snd_ctl_elem_id *id)
507 {
508         struct snd_card *card = file->card;
509         struct snd_kcontrol *kctl;
510         int idx, ret;
511
512         down_write(&card->controls_rwsem);
513         kctl = snd_ctl_find_id(card, id);
514         if (kctl == NULL) {
515                 ret = -ENOENT;
516                 goto error;
517         }
518         if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) {
519                 ret = -EINVAL;
520                 goto error;
521         }
522         for (idx = 0; idx < kctl->count; idx++)
523                 if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {
524                         ret = -EBUSY;
525                         goto error;
526                 }
527         ret = snd_ctl_remove(card, kctl);
528         if (ret < 0)
529                 goto error;
530         card->user_ctl_count--;
531 error:
532         up_write(&card->controls_rwsem);
533         return ret;
534 }
535
536 /**
537  * snd_ctl_activate_id - activate/inactivate the control of the given id
538  * @card: the card instance
539  * @id: the control id to activate/inactivate
540  * @active: non-zero to activate
541  *
542  * Finds the control instance with the given id, and activate or
543  * inactivate the control together with notification, if changed.
544  *
545  * Return: 0 if unchanged, 1 if changed, or a negative error code on failure.
546  */
547 int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id,
548                         int active)
549 {
550         struct snd_kcontrol *kctl;
551         struct snd_kcontrol_volatile *vd;
552         unsigned int index_offset;
553         int ret;
554
555         down_write(&card->controls_rwsem);
556         kctl = snd_ctl_find_id(card, id);
557         if (kctl == NULL) {
558                 ret = -ENOENT;
559                 goto unlock;
560         }
561         index_offset = snd_ctl_get_ioff(kctl, &kctl->id);
562         vd = &kctl->vd[index_offset];
563         ret = 0;
564         if (active) {
565                 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE))
566                         goto unlock;
567                 vd->access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
568         } else {
569                 if (vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)
570                         goto unlock;
571                 vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
572         }
573         ret = 1;
574  unlock:
575         up_write(&card->controls_rwsem);
576         if (ret > 0)
577                 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, id);
578         return ret;
579 }
580 EXPORT_SYMBOL_GPL(snd_ctl_activate_id);
581
582 /**
583  * snd_ctl_rename_id - replace the id of a control on the card
584  * @card: the card instance
585  * @src_id: the old id
586  * @dst_id: the new id
587  *
588  * Finds the control with the old id from the card, and replaces the
589  * id with the new one.
590  *
591  * Return: Zero if successful, or a negative error code on failure.
592  */
593 int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id,
594                       struct snd_ctl_elem_id *dst_id)
595 {
596         struct snd_kcontrol *kctl;
597
598         down_write(&card->controls_rwsem);
599         kctl = snd_ctl_find_id(card, src_id);
600         if (kctl == NULL) {
601                 up_write(&card->controls_rwsem);
602                 return -ENOENT;
603         }
604         kctl->id = *dst_id;
605         kctl->id.numid = card->last_numid + 1;
606         card->last_numid += kctl->count;
607         up_write(&card->controls_rwsem);
608         return 0;
609 }
610
611 EXPORT_SYMBOL(snd_ctl_rename_id);
612
613 /**
614  * snd_ctl_find_numid - find the control instance with the given number-id
615  * @card: the card instance
616  * @numid: the number-id to search
617  *
618  * Finds the control instance with the given number-id from the card.
619  *
620  * The caller must down card->controls_rwsem before calling this function
621  * (if the race condition can happen).
622  *
623  * Return: The pointer of the instance if found, or %NULL if not.
624  *
625  */
626 struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid)
627 {
628         struct snd_kcontrol *kctl;
629
630         if (snd_BUG_ON(!card || !numid))
631                 return NULL;
632         list_for_each_entry(kctl, &card->controls, list) {
633                 if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid)
634                         return kctl;
635         }
636         return NULL;
637 }
638
639 EXPORT_SYMBOL(snd_ctl_find_numid);
640
641 /**
642  * snd_ctl_find_id - find the control instance with the given id
643  * @card: the card instance
644  * @id: the id to search
645  *
646  * Finds the control instance with the given id from the card.
647  *
648  * The caller must down card->controls_rwsem before calling this function
649  * (if the race condition can happen).
650  *
651  * Return: The pointer of the instance if found, or %NULL if not.
652  *
653  */
654 struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card,
655                                      struct snd_ctl_elem_id *id)
656 {
657         struct snd_kcontrol *kctl;
658
659         if (snd_BUG_ON(!card || !id))
660                 return NULL;
661         if (id->numid != 0)
662                 return snd_ctl_find_numid(card, id->numid);
663         list_for_each_entry(kctl, &card->controls, list) {
664                 if (kctl->id.iface != id->iface)
665                         continue;
666                 if (kctl->id.device != id->device)
667                         continue;
668                 if (kctl->id.subdevice != id->subdevice)
669                         continue;
670                 if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name)))
671                         continue;
672                 if (kctl->id.index > id->index)
673                         continue;
674                 if (kctl->id.index + kctl->count <= id->index)
675                         continue;
676                 return kctl;
677         }
678         return NULL;
679 }
680
681 EXPORT_SYMBOL(snd_ctl_find_id);
682
683 static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,
684                              unsigned int cmd, void __user *arg)
685 {
686         struct snd_ctl_card_info *info;
687
688         info = kzalloc(sizeof(*info), GFP_KERNEL);
689         if (! info)
690                 return -ENOMEM;
691         down_read(&snd_ioctl_rwsem);
692         info->card = card->number;
693         strlcpy(info->id, card->id, sizeof(info->id));
694         strlcpy(info->driver, card->driver, sizeof(info->driver));
695         strlcpy(info->name, card->shortname, sizeof(info->name));
696         strlcpy(info->longname, card->longname, sizeof(info->longname));
697         strlcpy(info->mixername, card->mixername, sizeof(info->mixername));
698         strlcpy(info->components, card->components, sizeof(info->components));
699         up_read(&snd_ioctl_rwsem);
700         if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) {
701                 kfree(info);
702                 return -EFAULT;
703         }
704         kfree(info);
705         return 0;
706 }
707
708 static int snd_ctl_elem_list(struct snd_card *card,
709                              struct snd_ctl_elem_list __user *_list)
710 {
711         struct list_head *plist;
712         struct snd_ctl_elem_list list;
713         struct snd_kcontrol *kctl;
714         struct snd_ctl_elem_id *dst, *id;
715         unsigned int offset, space, jidx;
716         
717         if (copy_from_user(&list, _list, sizeof(list)))
718                 return -EFAULT;
719         offset = list.offset;
720         space = list.space;
721         /* try limit maximum space */
722         if (space > 16384)
723                 return -ENOMEM;
724         if (space > 0) {
725                 /* allocate temporary buffer for atomic operation */
726                 dst = vmalloc(space * sizeof(struct snd_ctl_elem_id));
727                 if (dst == NULL)
728                         return -ENOMEM;
729                 down_read(&card->controls_rwsem);
730                 list.count = card->controls_count;
731                 plist = card->controls.next;
732                 while (plist != &card->controls) {
733                         if (offset == 0)
734                                 break;
735                         kctl = snd_kcontrol(plist);
736                         if (offset < kctl->count)
737                                 break;
738                         offset -= kctl->count;
739                         plist = plist->next;
740                 }
741                 list.used = 0;
742                 id = dst;
743                 while (space > 0 && plist != &card->controls) {
744                         kctl = snd_kcontrol(plist);
745                         for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) {
746                                 snd_ctl_build_ioff(id, kctl, jidx);
747                                 id++;
748                                 space--;
749                                 list.used++;
750                         }
751                         plist = plist->next;
752                         offset = 0;
753                 }
754                 up_read(&card->controls_rwsem);
755                 if (list.used > 0 &&
756                     copy_to_user(list.pids, dst,
757                                  list.used * sizeof(struct snd_ctl_elem_id))) {
758                         vfree(dst);
759                         return -EFAULT;
760                 }
761                 vfree(dst);
762         } else {
763                 down_read(&card->controls_rwsem);
764                 list.count = card->controls_count;
765                 up_read(&card->controls_rwsem);
766         }
767         if (copy_to_user(_list, &list, sizeof(list)))
768                 return -EFAULT;
769         return 0;
770 }
771
772 static int snd_ctl_elem_info(struct snd_ctl_file *ctl,
773                              struct snd_ctl_elem_info *info)
774 {
775         struct snd_card *card = ctl->card;
776         struct snd_kcontrol *kctl;
777         struct snd_kcontrol_volatile *vd;
778         unsigned int index_offset;
779         int result;
780         
781         down_read(&card->controls_rwsem);
782         kctl = snd_ctl_find_id(card, &info->id);
783         if (kctl == NULL) {
784                 up_read(&card->controls_rwsem);
785                 return -ENOENT;
786         }
787 #ifdef CONFIG_SND_DEBUG
788         info->access = 0;
789 #endif
790         result = kctl->info(kctl, info);
791         if (result >= 0) {
792                 snd_BUG_ON(info->access);
793                 index_offset = snd_ctl_get_ioff(kctl, &info->id);
794                 vd = &kctl->vd[index_offset];
795                 snd_ctl_build_ioff(&info->id, kctl, index_offset);
796                 info->access = vd->access;
797                 if (vd->owner) {
798                         info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK;
799                         if (vd->owner == ctl)
800                                 info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER;
801                         info->owner = pid_vnr(vd->owner->pid);
802                 } else {
803                         info->owner = -1;
804                 }
805         }
806         up_read(&card->controls_rwsem);
807         return result;
808 }
809
810 static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,
811                                   struct snd_ctl_elem_info __user *_info)
812 {
813         struct snd_ctl_elem_info info;
814         int result;
815
816         if (copy_from_user(&info, _info, sizeof(info)))
817                 return -EFAULT;
818         snd_power_lock(ctl->card);
819         result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
820         if (result >= 0)
821                 result = snd_ctl_elem_info(ctl, &info);
822         snd_power_unlock(ctl->card);
823         if (result >= 0)
824                 if (copy_to_user(_info, &info, sizeof(info)))
825                         return -EFAULT;
826         return result;
827 }
828
829 static int snd_ctl_elem_read(struct snd_card *card,
830                              struct snd_ctl_elem_value *control)
831 {
832         struct snd_kcontrol *kctl;
833         struct snd_kcontrol_volatile *vd;
834         unsigned int index_offset;
835         int result;
836
837         down_read(&card->controls_rwsem);
838         kctl = snd_ctl_find_id(card, &control->id);
839         if (kctl == NULL) {
840                 result = -ENOENT;
841         } else {
842                 index_offset = snd_ctl_get_ioff(kctl, &control->id);
843                 vd = &kctl->vd[index_offset];
844                 if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) &&
845                     kctl->get != NULL) {
846                         snd_ctl_build_ioff(&control->id, kctl, index_offset);
847                         result = kctl->get(kctl, control);
848                 } else
849                         result = -EPERM;
850         }
851         up_read(&card->controls_rwsem);
852         return result;
853 }
854
855 static int snd_ctl_elem_read_user(struct snd_card *card,
856                                   struct snd_ctl_elem_value __user *_control)
857 {
858         struct snd_ctl_elem_value *control;
859         int result;
860
861         control = memdup_user(_control, sizeof(*control));
862         if (IS_ERR(control))
863                 return PTR_ERR(control);
864
865         snd_power_lock(card);
866         result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
867         if (result >= 0)
868                 result = snd_ctl_elem_read(card, control);
869         snd_power_unlock(card);
870         if (result >= 0)
871                 if (copy_to_user(_control, control, sizeof(*control)))
872                         result = -EFAULT;
873         kfree(control);
874         return result;
875 }
876
877 static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file,
878                               struct snd_ctl_elem_value *control)
879 {
880         struct snd_kcontrol *kctl;
881         struct snd_kcontrol_volatile *vd;
882         unsigned int index_offset;
883         int result;
884
885         down_read(&card->controls_rwsem);
886         kctl = snd_ctl_find_id(card, &control->id);
887         if (kctl == NULL) {
888                 result = -ENOENT;
889         } else {
890                 index_offset = snd_ctl_get_ioff(kctl, &control->id);
891                 vd = &kctl->vd[index_offset];
892                 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) ||
893                     kctl->put == NULL ||
894                     (file && vd->owner && vd->owner != file)) {
895                         result = -EPERM;
896                 } else {
897                         snd_ctl_build_ioff(&control->id, kctl, index_offset);
898                         result = kctl->put(kctl, control);
899                 }
900                 if (result > 0) {
901                         up_read(&card->controls_rwsem);
902                         snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
903                                        &control->id);
904                         return 0;
905                 }
906         }
907         up_read(&card->controls_rwsem);
908         return result;
909 }
910
911 static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
912                                    struct snd_ctl_elem_value __user *_control)
913 {
914         struct snd_ctl_elem_value *control;
915         struct snd_card *card;
916         int result;
917
918         control = memdup_user(_control, sizeof(*control));
919         if (IS_ERR(control))
920                 return PTR_ERR(control);
921
922         card = file->card;
923         snd_power_lock(card);
924         result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
925         if (result >= 0)
926                 result = snd_ctl_elem_write(card, file, control);
927         snd_power_unlock(card);
928         if (result >= 0)
929                 if (copy_to_user(_control, control, sizeof(*control)))
930                         result = -EFAULT;
931         kfree(control);
932         return result;
933 }
934
935 static int snd_ctl_elem_lock(struct snd_ctl_file *file,
936                              struct snd_ctl_elem_id __user *_id)
937 {
938         struct snd_card *card = file->card;
939         struct snd_ctl_elem_id id;
940         struct snd_kcontrol *kctl;
941         struct snd_kcontrol_volatile *vd;
942         int result;
943         
944         if (copy_from_user(&id, _id, sizeof(id)))
945                 return -EFAULT;
946         down_write(&card->controls_rwsem);
947         kctl = snd_ctl_find_id(card, &id);
948         if (kctl == NULL) {
949                 result = -ENOENT;
950         } else {
951                 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
952                 if (vd->owner != NULL)
953                         result = -EBUSY;
954                 else {
955                         vd->owner = file;
956                         result = 0;
957                 }
958         }
959         up_write(&card->controls_rwsem);
960         return result;
961 }
962
963 static int snd_ctl_elem_unlock(struct snd_ctl_file *file,
964                                struct snd_ctl_elem_id __user *_id)
965 {
966         struct snd_card *card = file->card;
967         struct snd_ctl_elem_id id;
968         struct snd_kcontrol *kctl;
969         struct snd_kcontrol_volatile *vd;
970         int result;
971         
972         if (copy_from_user(&id, _id, sizeof(id)))
973                 return -EFAULT;
974         down_write(&card->controls_rwsem);
975         kctl = snd_ctl_find_id(card, &id);
976         if (kctl == NULL) {
977                 result = -ENOENT;
978         } else {
979                 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
980                 if (vd->owner == NULL)
981                         result = -EINVAL;
982                 else if (vd->owner != file)
983                         result = -EPERM;
984                 else {
985                         vd->owner = NULL;
986                         result = 0;
987                 }
988         }
989         up_write(&card->controls_rwsem);
990         return result;
991 }
992
993 struct user_element {
994         struct snd_ctl_elem_info info;
995         struct snd_card *card;
996         void *elem_data;                /* element data */
997         unsigned long elem_data_size;   /* size of element data in bytes */
998         void *tlv_data;                 /* TLV data */
999         unsigned long tlv_data_size;    /* TLV data size */
1000         void *priv_data;                /* private data (like strings for enumerated type) */
1001 };
1002
1003 static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol,
1004                                   struct snd_ctl_elem_info *uinfo)
1005 {
1006         struct user_element *ue = kcontrol->private_data;
1007
1008         *uinfo = ue->info;
1009         return 0;
1010 }
1011
1012 static int snd_ctl_elem_user_enum_info(struct snd_kcontrol *kcontrol,
1013                                        struct snd_ctl_elem_info *uinfo)
1014 {
1015         struct user_element *ue = kcontrol->private_data;
1016         const char *names;
1017         unsigned int item;
1018
1019         item = uinfo->value.enumerated.item;
1020
1021         *uinfo = ue->info;
1022
1023         item = min(item, uinfo->value.enumerated.items - 1);
1024         uinfo->value.enumerated.item = item;
1025
1026         names = ue->priv_data;
1027         for (; item > 0; --item)
1028                 names += strlen(names) + 1;
1029         strcpy(uinfo->value.enumerated.name, names);
1030
1031         return 0;
1032 }
1033
1034 static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol,
1035                                  struct snd_ctl_elem_value *ucontrol)
1036 {
1037         struct user_element *ue = kcontrol->private_data;
1038
1039         mutex_lock(&ue->card->user_ctl_lock);
1040         memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size);
1041         mutex_unlock(&ue->card->user_ctl_lock);
1042         return 0;
1043 }
1044
1045 static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol,
1046                                  struct snd_ctl_elem_value *ucontrol)
1047 {
1048         int change;
1049         struct user_element *ue = kcontrol->private_data;
1050
1051         mutex_lock(&ue->card->user_ctl_lock);
1052         change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0;
1053         if (change)
1054                 memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size);
1055         mutex_unlock(&ue->card->user_ctl_lock);
1056         return change;
1057 }
1058
1059 static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol,
1060                                  int op_flag,
1061                                  unsigned int size,
1062                                  unsigned int __user *tlv)
1063 {
1064         struct user_element *ue = kcontrol->private_data;
1065         int change = 0;
1066         void *new_data;
1067
1068         if (op_flag > 0) {
1069                 if (size > 1024 * 128)  /* sane value */
1070                         return -EINVAL;
1071
1072                 new_data = memdup_user(tlv, size);
1073                 if (IS_ERR(new_data))
1074                         return PTR_ERR(new_data);
1075                 mutex_lock(&ue->card->user_ctl_lock);
1076                 change = ue->tlv_data_size != size;
1077                 if (!change)
1078                         change = memcmp(ue->tlv_data, new_data, size);
1079                 kfree(ue->tlv_data);
1080                 ue->tlv_data = new_data;
1081                 ue->tlv_data_size = size;
1082                 mutex_unlock(&ue->card->user_ctl_lock);
1083         } else {
1084                 int ret = 0;
1085
1086                 mutex_lock(&ue->card->user_ctl_lock);
1087                 if (!ue->tlv_data_size || !ue->tlv_data) {
1088                         ret = -ENXIO;
1089                         goto err_unlock;
1090                 }
1091                 if (size < ue->tlv_data_size) {
1092                         ret = -ENOSPC;
1093                         goto err_unlock;
1094                 }
1095                 if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size))
1096                         ret = -EFAULT;
1097 err_unlock:
1098                 mutex_unlock(&ue->card->user_ctl_lock);
1099                 if (ret)
1100                         return ret;
1101         }
1102         return change;
1103 }
1104
1105 static int snd_ctl_elem_init_enum_names(struct user_element *ue)
1106 {
1107         char *names, *p;
1108         size_t buf_len, name_len;
1109         unsigned int i;
1110         const uintptr_t user_ptrval = ue->info.value.enumerated.names_ptr;
1111
1112         if (ue->info.value.enumerated.names_length > 64 * 1024)
1113                 return -EINVAL;
1114
1115         names = memdup_user((const void __user *)user_ptrval,
1116                 ue->info.value.enumerated.names_length);
1117         if (IS_ERR(names))
1118                 return PTR_ERR(names);
1119
1120         /* check that there are enough valid names */
1121         buf_len = ue->info.value.enumerated.names_length;
1122         p = names;
1123         for (i = 0; i < ue->info.value.enumerated.items; ++i) {
1124                 name_len = strnlen(p, buf_len);
1125                 if (name_len == 0 || name_len >= 64 || name_len == buf_len) {
1126                         kfree(names);
1127                         return -EINVAL;
1128                 }
1129                 p += name_len + 1;
1130                 buf_len -= name_len + 1;
1131         }
1132
1133         ue->priv_data = names;
1134         ue->info.value.enumerated.names_ptr = 0;
1135
1136         return 0;
1137 }
1138
1139 static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol)
1140 {
1141         struct user_element *ue = kcontrol->private_data;
1142
1143         kfree(ue->tlv_data);
1144         kfree(ue->priv_data);
1145         kfree(ue);
1146 }
1147
1148 static int snd_ctl_elem_add(struct snd_ctl_file *file,
1149                             struct snd_ctl_elem_info *info, int replace)
1150 {
1151         struct snd_card *card = file->card;
1152         struct snd_kcontrol kctl, *_kctl;
1153         unsigned int access;
1154         long private_size;
1155         struct user_element *ue;
1156         int idx, err;
1157
1158         if (!replace && card->user_ctl_count >= MAX_USER_CONTROLS)
1159                 return -ENOMEM;
1160         if (info->count < 1)
1161                 return -EINVAL;
1162         access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
1163                 (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
1164                                  SNDRV_CTL_ELEM_ACCESS_INACTIVE|
1165                                  SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE));
1166         info->id.numid = 0;
1167         memset(&kctl, 0, sizeof(kctl));
1168         down_write(&card->controls_rwsem);
1169         _kctl = snd_ctl_find_id(card, &info->id);
1170         err = 0;
1171         if (_kctl) {
1172                 if (replace)
1173                         err = snd_ctl_remove(card, _kctl);
1174                 else
1175                         err = -EBUSY;
1176         } else {
1177                 if (replace)
1178                         err = -ENOENT;
1179         }
1180         up_write(&card->controls_rwsem);
1181         if (err < 0)
1182                 return err;
1183         memcpy(&kctl.id, &info->id, sizeof(info->id));
1184         kctl.count = info->owner ? info->owner : 1;
1185         access |= SNDRV_CTL_ELEM_ACCESS_USER;
1186         if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED)
1187                 kctl.info = snd_ctl_elem_user_enum_info;
1188         else
1189                 kctl.info = snd_ctl_elem_user_info;
1190         if (access & SNDRV_CTL_ELEM_ACCESS_READ)
1191                 kctl.get = snd_ctl_elem_user_get;
1192         if (access & SNDRV_CTL_ELEM_ACCESS_WRITE)
1193                 kctl.put = snd_ctl_elem_user_put;
1194         if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) {
1195                 kctl.tlv.c = snd_ctl_elem_user_tlv;
1196                 access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1197         }
1198         switch (info->type) {
1199         case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
1200         case SNDRV_CTL_ELEM_TYPE_INTEGER:
1201                 private_size = sizeof(long);
1202                 if (info->count > 128)
1203                         return -EINVAL;
1204                 break;
1205         case SNDRV_CTL_ELEM_TYPE_INTEGER64:
1206                 private_size = sizeof(long long);
1207                 if (info->count > 64)
1208                         return -EINVAL;
1209                 break;
1210         case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
1211                 private_size = sizeof(unsigned int);
1212                 if (info->count > 128 || info->value.enumerated.items == 0)
1213                         return -EINVAL;
1214                 break;
1215         case SNDRV_CTL_ELEM_TYPE_BYTES:
1216                 private_size = sizeof(unsigned char);
1217                 if (info->count > 512)
1218                         return -EINVAL;
1219                 break;
1220         case SNDRV_CTL_ELEM_TYPE_IEC958:
1221                 private_size = sizeof(struct snd_aes_iec958);
1222                 if (info->count != 1)
1223                         return -EINVAL;
1224                 break;
1225         default:
1226                 return -EINVAL;
1227         }
1228         private_size *= info->count;
1229         ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL);
1230         if (ue == NULL)
1231                 return -ENOMEM;
1232         ue->card = card;
1233         ue->info = *info;
1234         ue->info.access = 0;
1235         ue->elem_data = (char *)ue + sizeof(*ue);
1236         ue->elem_data_size = private_size;
1237         if (ue->info.type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) {
1238                 err = snd_ctl_elem_init_enum_names(ue);
1239                 if (err < 0) {
1240                         kfree(ue);
1241                         return err;
1242                 }
1243         }
1244         kctl.private_free = snd_ctl_elem_user_free;
1245         _kctl = snd_ctl_new(&kctl, access);
1246         if (_kctl == NULL) {
1247                 kfree(ue->priv_data);
1248                 kfree(ue);
1249                 return -ENOMEM;
1250         }
1251         _kctl->private_data = ue;
1252         for (idx = 0; idx < _kctl->count; idx++)
1253                 _kctl->vd[idx].owner = file;
1254         err = snd_ctl_add(card, _kctl);
1255         if (err < 0)
1256                 return err;
1257
1258         down_write(&card->controls_rwsem);
1259         card->user_ctl_count++;
1260         up_write(&card->controls_rwsem);
1261
1262         return 0;
1263 }
1264
1265 static int snd_ctl_elem_add_user(struct snd_ctl_file *file,
1266                                  struct snd_ctl_elem_info __user *_info, int replace)
1267 {
1268         struct snd_ctl_elem_info info;
1269         if (copy_from_user(&info, _info, sizeof(info)))
1270                 return -EFAULT;
1271         return snd_ctl_elem_add(file, &info, replace);
1272 }
1273
1274 static int snd_ctl_elem_remove(struct snd_ctl_file *file,
1275                                struct snd_ctl_elem_id __user *_id)
1276 {
1277         struct snd_ctl_elem_id id;
1278
1279         if (copy_from_user(&id, _id, sizeof(id)))
1280                 return -EFAULT;
1281         return snd_ctl_remove_user_ctl(file, &id);
1282 }
1283
1284 static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr)
1285 {
1286         int subscribe;
1287         if (get_user(subscribe, ptr))
1288                 return -EFAULT;
1289         if (subscribe < 0) {
1290                 subscribe = file->subscribed;
1291                 if (put_user(subscribe, ptr))
1292                         return -EFAULT;
1293                 return 0;
1294         }
1295         if (subscribe) {
1296                 file->subscribed = 1;
1297                 return 0;
1298         } else if (file->subscribed) {
1299                 snd_ctl_empty_read_queue(file);
1300                 file->subscribed = 0;
1301         }
1302         return 0;
1303 }
1304
1305 static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file,
1306                              struct snd_ctl_tlv __user *_tlv,
1307                              int op_flag)
1308 {
1309         struct snd_card *card = file->card;
1310         struct snd_ctl_tlv tlv;
1311         struct snd_kcontrol *kctl;
1312         struct snd_kcontrol_volatile *vd;
1313         unsigned int len;
1314         int err = 0;
1315
1316         if (copy_from_user(&tlv, _tlv, sizeof(tlv)))
1317                 return -EFAULT;
1318         if (tlv.length < sizeof(unsigned int) * 2)
1319                 return -EINVAL;
1320         down_read(&card->controls_rwsem);
1321         kctl = snd_ctl_find_numid(card, tlv.numid);
1322         if (kctl == NULL) {
1323                 err = -ENOENT;
1324                 goto __kctl_end;
1325         }
1326         if (kctl->tlv.p == NULL) {
1327                 err = -ENXIO;
1328                 goto __kctl_end;
1329         }
1330         vd = &kctl->vd[tlv.numid - kctl->id.numid];
1331         if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) ||
1332             (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) ||
1333             (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) {
1334                 err = -ENXIO;
1335                 goto __kctl_end;
1336         }
1337         if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) {
1338                 if (vd->owner != NULL && vd->owner != file) {
1339                         err = -EPERM;
1340                         goto __kctl_end;
1341                 }
1342                 err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv);
1343                 if (err > 0) {
1344                         up_read(&card->controls_rwsem);
1345                         snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id);
1346                         return 0;
1347                 }
1348         } else {
1349                 if (op_flag) {
1350                         err = -ENXIO;
1351                         goto __kctl_end;
1352                 }
1353                 len = kctl->tlv.p[1] + 2 * sizeof(unsigned int);
1354                 if (tlv.length < len) {
1355                         err = -ENOMEM;
1356                         goto __kctl_end;
1357                 }
1358                 if (copy_to_user(_tlv->tlv, kctl->tlv.p, len))
1359                         err = -EFAULT;
1360         }
1361       __kctl_end:
1362         up_read(&card->controls_rwsem);
1363         return err;
1364 }
1365
1366 static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1367 {
1368         struct snd_ctl_file *ctl;
1369         struct snd_card *card;
1370         struct snd_kctl_ioctl *p;
1371         void __user *argp = (void __user *)arg;
1372         int __user *ip = argp;
1373         int err;
1374
1375         ctl = file->private_data;
1376         card = ctl->card;
1377         if (snd_BUG_ON(!card))
1378                 return -ENXIO;
1379         switch (cmd) {
1380         case SNDRV_CTL_IOCTL_PVERSION:
1381                 return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0;
1382         case SNDRV_CTL_IOCTL_CARD_INFO:
1383                 return snd_ctl_card_info(card, ctl, cmd, argp);
1384         case SNDRV_CTL_IOCTL_ELEM_LIST:
1385                 return snd_ctl_elem_list(card, argp);
1386         case SNDRV_CTL_IOCTL_ELEM_INFO:
1387                 return snd_ctl_elem_info_user(ctl, argp);
1388         case SNDRV_CTL_IOCTL_ELEM_READ:
1389                 return snd_ctl_elem_read_user(card, argp);
1390         case SNDRV_CTL_IOCTL_ELEM_WRITE:
1391                 return snd_ctl_elem_write_user(ctl, argp);
1392         case SNDRV_CTL_IOCTL_ELEM_LOCK:
1393                 return snd_ctl_elem_lock(ctl, argp);
1394         case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
1395                 return snd_ctl_elem_unlock(ctl, argp);
1396         case SNDRV_CTL_IOCTL_ELEM_ADD:
1397                 return snd_ctl_elem_add_user(ctl, argp, 0);
1398         case SNDRV_CTL_IOCTL_ELEM_REPLACE:
1399                 return snd_ctl_elem_add_user(ctl, argp, 1);
1400         case SNDRV_CTL_IOCTL_ELEM_REMOVE:
1401                 return snd_ctl_elem_remove(ctl, argp);
1402         case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
1403                 return snd_ctl_subscribe_events(ctl, ip);
1404         case SNDRV_CTL_IOCTL_TLV_READ:
1405                 return snd_ctl_tlv_ioctl(ctl, argp, 0);
1406         case SNDRV_CTL_IOCTL_TLV_WRITE:
1407                 return snd_ctl_tlv_ioctl(ctl, argp, 1);
1408         case SNDRV_CTL_IOCTL_TLV_COMMAND:
1409                 return snd_ctl_tlv_ioctl(ctl, argp, -1);
1410         case SNDRV_CTL_IOCTL_POWER:
1411                 return -ENOPROTOOPT;
1412         case SNDRV_CTL_IOCTL_POWER_STATE:
1413 #ifdef CONFIG_PM
1414                 return put_user(card->power_state, ip) ? -EFAULT : 0;
1415 #else
1416                 return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0;
1417 #endif
1418         }
1419         down_read(&snd_ioctl_rwsem);
1420         list_for_each_entry(p, &snd_control_ioctls, list) {
1421                 err = p->fioctl(card, ctl, cmd, arg);
1422                 if (err != -ENOIOCTLCMD) {
1423                         up_read(&snd_ioctl_rwsem);
1424                         return err;
1425                 }
1426         }
1427         up_read(&snd_ioctl_rwsem);
1428         snd_printdd("unknown ioctl = 0x%x\n", cmd);
1429         return -ENOTTY;
1430 }
1431
1432 static ssize_t snd_ctl_read(struct file *file, char __user *buffer,
1433                             size_t count, loff_t * offset)
1434 {
1435         struct snd_ctl_file *ctl;
1436         int err = 0;
1437         ssize_t result = 0;
1438
1439         ctl = file->private_data;
1440         if (snd_BUG_ON(!ctl || !ctl->card))
1441                 return -ENXIO;
1442         if (!ctl->subscribed)
1443                 return -EBADFD;
1444         if (count < sizeof(struct snd_ctl_event))
1445                 return -EINVAL;
1446         spin_lock_irq(&ctl->read_lock);
1447         while (count >= sizeof(struct snd_ctl_event)) {
1448                 struct snd_ctl_event ev;
1449                 struct snd_kctl_event *kev;
1450                 while (list_empty(&ctl->events)) {
1451                         wait_queue_t wait;
1452                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1453                                 err = -EAGAIN;
1454                                 goto __end_lock;
1455                         }
1456                         init_waitqueue_entry(&wait, current);
1457                         add_wait_queue(&ctl->change_sleep, &wait);
1458                         set_current_state(TASK_INTERRUPTIBLE);
1459                         spin_unlock_irq(&ctl->read_lock);
1460                         schedule();
1461                         remove_wait_queue(&ctl->change_sleep, &wait);
1462                         if (ctl->card->shutdown)
1463                                 return -ENODEV;
1464                         if (signal_pending(current))
1465                                 return -ERESTARTSYS;
1466                         spin_lock_irq(&ctl->read_lock);
1467                 }
1468                 kev = snd_kctl_event(ctl->events.next);
1469                 ev.type = SNDRV_CTL_EVENT_ELEM;
1470                 ev.data.elem.mask = kev->mask;
1471                 ev.data.elem.id = kev->id;
1472                 list_del(&kev->list);
1473                 spin_unlock_irq(&ctl->read_lock);
1474                 kfree(kev);
1475                 if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) {
1476                         err = -EFAULT;
1477                         goto __end;
1478                 }
1479                 spin_lock_irq(&ctl->read_lock);
1480                 buffer += sizeof(struct snd_ctl_event);
1481                 count -= sizeof(struct snd_ctl_event);
1482                 result += sizeof(struct snd_ctl_event);
1483         }
1484       __end_lock:
1485         spin_unlock_irq(&ctl->read_lock);
1486       __end:
1487         return result > 0 ? result : err;
1488 }
1489
1490 static unsigned int snd_ctl_poll(struct file *file, poll_table * wait)
1491 {
1492         unsigned int mask;
1493         struct snd_ctl_file *ctl;
1494
1495         ctl = file->private_data;
1496         if (!ctl->subscribed)
1497                 return 0;
1498         poll_wait(file, &ctl->change_sleep, wait);
1499
1500         mask = 0;
1501         if (!list_empty(&ctl->events))
1502                 mask |= POLLIN | POLLRDNORM;
1503
1504         return mask;
1505 }
1506
1507 /*
1508  * register the device-specific control-ioctls.
1509  * called from each device manager like pcm.c, hwdep.c, etc.
1510  */
1511 static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists)
1512 {
1513         struct snd_kctl_ioctl *pn;
1514
1515         pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL);
1516         if (pn == NULL)
1517                 return -ENOMEM;
1518         pn->fioctl = fcn;
1519         down_write(&snd_ioctl_rwsem);
1520         list_add_tail(&pn->list, lists);
1521         up_write(&snd_ioctl_rwsem);
1522         return 0;
1523 }
1524
1525 int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn)
1526 {
1527         return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls);
1528 }
1529
1530 EXPORT_SYMBOL(snd_ctl_register_ioctl);
1531
1532 #ifdef CONFIG_COMPAT
1533 int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1534 {
1535         return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls);
1536 }
1537
1538 EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
1539 #endif
1540
1541 /*
1542  * de-register the device-specific control-ioctls.
1543  */
1544 static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn,
1545                                      struct list_head *lists)
1546 {
1547         struct snd_kctl_ioctl *p;
1548
1549         if (snd_BUG_ON(!fcn))
1550                 return -EINVAL;
1551         down_write(&snd_ioctl_rwsem);
1552         list_for_each_entry(p, lists, list) {
1553                 if (p->fioctl == fcn) {
1554                         list_del(&p->list);
1555                         up_write(&snd_ioctl_rwsem);
1556                         kfree(p);
1557                         return 0;
1558                 }
1559         }
1560         up_write(&snd_ioctl_rwsem);
1561         snd_BUG();
1562         return -EINVAL;
1563 }
1564
1565 int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn)
1566 {
1567         return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls);
1568 }
1569
1570 EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
1571
1572 #ifdef CONFIG_COMPAT
1573 int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1574 {
1575         return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls);
1576 }
1577
1578 EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
1579 #endif
1580
1581 static int snd_ctl_fasync(int fd, struct file * file, int on)
1582 {
1583         struct snd_ctl_file *ctl;
1584
1585         ctl = file->private_data;
1586         return fasync_helper(fd, file, on, &ctl->fasync);
1587 }
1588
1589 /*
1590  * ioctl32 compat
1591  */
1592 #ifdef CONFIG_COMPAT
1593 #include "control_compat.c"
1594 #else
1595 #define snd_ctl_ioctl_compat    NULL
1596 #endif
1597
1598 /*
1599  *  INIT PART
1600  */
1601
1602 static const struct file_operations snd_ctl_f_ops =
1603 {
1604         .owner =        THIS_MODULE,
1605         .read =         snd_ctl_read,
1606         .open =         snd_ctl_open,
1607         .release =      snd_ctl_release,
1608         .llseek =       no_llseek,
1609         .poll =         snd_ctl_poll,
1610         .unlocked_ioctl =       snd_ctl_ioctl,
1611         .compat_ioctl = snd_ctl_ioctl_compat,
1612         .fasync =       snd_ctl_fasync,
1613 };
1614
1615 /*
1616  * registration of the control device
1617  */
1618 static int snd_ctl_dev_register(struct snd_device *device)
1619 {
1620         struct snd_card *card = device->device_data;
1621         int err, cardnum;
1622         char name[16];
1623
1624         if (snd_BUG_ON(!card))
1625                 return -ENXIO;
1626         cardnum = card->number;
1627         if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1628                 return -ENXIO;
1629         sprintf(name, "controlC%i", cardnum);
1630         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
1631                                        &snd_ctl_f_ops, card, name)) < 0)
1632                 return err;
1633         return 0;
1634 }
1635
1636 /*
1637  * disconnection of the control device
1638  */
1639 static int snd_ctl_dev_disconnect(struct snd_device *device)
1640 {
1641         struct snd_card *card = device->device_data;
1642         struct snd_ctl_file *ctl;
1643         int err, cardnum;
1644
1645         if (snd_BUG_ON(!card))
1646                 return -ENXIO;
1647         cardnum = card->number;
1648         if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1649                 return -ENXIO;
1650
1651         read_lock(&card->ctl_files_rwlock);
1652         list_for_each_entry(ctl, &card->ctl_files, list) {
1653                 wake_up(&ctl->change_sleep);
1654                 kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);
1655         }
1656         read_unlock(&card->ctl_files_rwlock);
1657
1658         if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL,
1659                                          card, -1)) < 0)
1660                 return err;
1661         return 0;
1662 }
1663
1664 /*
1665  * free all controls
1666  */
1667 static int snd_ctl_dev_free(struct snd_device *device)
1668 {
1669         struct snd_card *card = device->device_data;
1670         struct snd_kcontrol *control;
1671
1672         down_write(&card->controls_rwsem);
1673         while (!list_empty(&card->controls)) {
1674                 control = snd_kcontrol(card->controls.next);
1675                 snd_ctl_remove(card, control);
1676         }
1677         up_write(&card->controls_rwsem);
1678         return 0;
1679 }
1680
1681 /*
1682  * create control core:
1683  * called from init.c
1684  */
1685 int snd_ctl_create(struct snd_card *card)
1686 {
1687         static struct snd_device_ops ops = {
1688                 .dev_free = snd_ctl_dev_free,
1689                 .dev_register = snd_ctl_dev_register,
1690                 .dev_disconnect = snd_ctl_dev_disconnect,
1691         };
1692
1693         if (snd_BUG_ON(!card))
1694                 return -ENXIO;
1695         return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);
1696 }
1697
1698 /*
1699  * Frequently used control callbacks/helpers
1700  */
1701 int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
1702                               struct snd_ctl_elem_info *uinfo)
1703 {
1704         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1705         uinfo->count = 1;
1706         uinfo->value.integer.min = 0;
1707         uinfo->value.integer.max = 1;
1708         return 0;
1709 }
1710
1711 EXPORT_SYMBOL(snd_ctl_boolean_mono_info);
1712
1713 int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
1714                                 struct snd_ctl_elem_info *uinfo)
1715 {
1716         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1717         uinfo->count = 2;
1718         uinfo->value.integer.min = 0;
1719         uinfo->value.integer.max = 1;
1720         return 0;
1721 }
1722
1723 EXPORT_SYMBOL(snd_ctl_boolean_stereo_info);
1724
1725 /**
1726  * snd_ctl_enum_info - fills the info structure for an enumerated control
1727  * @info: the structure to be filled
1728  * @channels: the number of the control's channels; often one
1729  * @items: the number of control values; also the size of @names
1730  * @names: an array containing the names of all control values
1731  *
1732  * Sets all required fields in @info to their appropriate values.
1733  * If the control's accessibility is not the default (readable and writable),
1734  * the caller has to fill @info->access.
1735  *
1736  * Return: Zero.
1737  */
1738 int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels,
1739                       unsigned int items, const char *const names[])
1740 {
1741         info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
1742         info->count = channels;
1743         info->value.enumerated.items = items;
1744         if (info->value.enumerated.item >= items)
1745                 info->value.enumerated.item = items - 1;
1746         strlcpy(info->value.enumerated.name,
1747                 names[info->value.enumerated.item],
1748                 sizeof(info->value.enumerated.name));
1749         return 0;
1750 }
1751 EXPORT_SYMBOL(snd_ctl_enum_info);