ALSA: seq: Fix snd_seq_call_port_info_ioctl in compat mode
[pandora-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  * Returns 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  * Returns 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_INACTIVE|
253                                       SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE|
254                                       SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND|
255                                       SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK));
256         kctl.info = ncontrol->info;
257         kctl.get = ncontrol->get;
258         kctl.put = ncontrol->put;
259         kctl.tlv.p = ncontrol->tlv.p;
260         kctl.private_value = ncontrol->private_value;
261         kctl.private_data = private_data;
262         return snd_ctl_new(&kctl, access);
263 }
264
265 EXPORT_SYMBOL(snd_ctl_new1);
266
267 /**
268  * snd_ctl_free_one - release the control instance
269  * @kcontrol: the control instance
270  *
271  * Releases the control instance created via snd_ctl_new()
272  * or snd_ctl_new1().
273  * Don't call this after the control was added to the card.
274  */
275 void snd_ctl_free_one(struct snd_kcontrol *kcontrol)
276 {
277         if (kcontrol) {
278                 if (kcontrol->private_free)
279                         kcontrol->private_free(kcontrol);
280                 kfree(kcontrol);
281         }
282 }
283
284 EXPORT_SYMBOL(snd_ctl_free_one);
285
286 static bool snd_ctl_remove_numid_conflict(struct snd_card *card,
287                                           unsigned int count)
288 {
289         struct snd_kcontrol *kctl;
290
291         /* Make sure that the ids assigned to the control do not wrap around */
292         if (card->last_numid >= UINT_MAX - count)
293                 card->last_numid = 0;
294
295         list_for_each_entry(kctl, &card->controls, list) {
296                 if (kctl->id.numid < card->last_numid + 1 + count &&
297                     kctl->id.numid + kctl->count > card->last_numid + 1) {
298                         card->last_numid = kctl->id.numid + kctl->count - 1;
299                         return true;
300                 }
301         }
302         return false;
303 }
304
305 static int snd_ctl_find_hole(struct snd_card *card, unsigned int count)
306 {
307         unsigned int iter = 100000;
308
309         while (snd_ctl_remove_numid_conflict(card, count)) {
310                 if (--iter == 0) {
311                         /* this situation is very unlikely */
312                         snd_printk(KERN_ERR "unable to allocate new control numid\n");
313                         return -ENOMEM;
314                 }
315         }
316         return 0;
317 }
318
319 /**
320  * snd_ctl_add - add the control instance to the card
321  * @card: the card instance
322  * @kcontrol: the control instance to add
323  *
324  * Adds the control instance created via snd_ctl_new() or
325  * snd_ctl_new1() to the given card. Assigns also an unique
326  * numid used for fast search.
327  *
328  * Returns zero if successful, or a negative error code on failure.
329  *
330  * It frees automatically the control which cannot be added.
331  */
332 int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
333 {
334         struct snd_ctl_elem_id id;
335         unsigned int idx;
336         unsigned int count;
337         int err = -EINVAL;
338
339         if (! kcontrol)
340                 return err;
341         if (snd_BUG_ON(!card || !kcontrol->info))
342                 goto error;
343         id = kcontrol->id;
344         if (id.index > UINT_MAX - kcontrol->count)
345                 goto error;
346
347         down_write(&card->controls_rwsem);
348         if (snd_ctl_find_id(card, &id)) {
349                 up_write(&card->controls_rwsem);
350                 snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n",
351                                         id.iface,
352                                         id.device,
353                                         id.subdevice,
354                                         id.name,
355                                         id.index);
356                 err = -EBUSY;
357                 goto error;
358         }
359         if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
360                 up_write(&card->controls_rwsem);
361                 err = -ENOMEM;
362                 goto error;
363         }
364         list_add_tail(&kcontrol->list, &card->controls);
365         card->controls_count += kcontrol->count;
366         kcontrol->id.numid = card->last_numid + 1;
367         card->last_numid += kcontrol->count;
368         count = kcontrol->count;
369         up_write(&card->controls_rwsem);
370         for (idx = 0; idx < count; idx++, id.index++, id.numid++)
371                 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
372         return 0;
373
374  error:
375         snd_ctl_free_one(kcontrol);
376         return err;
377 }
378
379 EXPORT_SYMBOL(snd_ctl_add);
380
381 /**
382  * snd_ctl_replace - replace the control instance of the card
383  * @card: the card instance
384  * @kcontrol: the control instance to replace
385  * @add_on_replace: add the control if not already added
386  *
387  * Replaces the given control.  If the given control does not exist
388  * and the add_on_replace flag is set, the control is added.  If the
389  * control exists, it is destroyed first.
390  *
391  * Returns zero if successful, or a negative error code on failure.
392  *
393  * It frees automatically the control which cannot be added or replaced.
394  */
395 int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol,
396                     bool add_on_replace)
397 {
398         struct snd_ctl_elem_id id;
399         unsigned int count;
400         unsigned int idx;
401         struct snd_kcontrol *old;
402         int ret;
403
404         if (!kcontrol)
405                 return -EINVAL;
406         if (snd_BUG_ON(!card || !kcontrol->info)) {
407                 ret = -EINVAL;
408                 goto error;
409         }
410         id = kcontrol->id;
411         down_write(&card->controls_rwsem);
412         old = snd_ctl_find_id(card, &id);
413         if (!old) {
414                 if (add_on_replace)
415                         goto add;
416                 up_write(&card->controls_rwsem);
417                 ret = -EINVAL;
418                 goto error;
419         }
420         ret = snd_ctl_remove(card, old);
421         if (ret < 0) {
422                 up_write(&card->controls_rwsem);
423                 goto error;
424         }
425 add:
426         if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
427                 up_write(&card->controls_rwsem);
428                 ret = -ENOMEM;
429                 goto error;
430         }
431         list_add_tail(&kcontrol->list, &card->controls);
432         card->controls_count += kcontrol->count;
433         kcontrol->id.numid = card->last_numid + 1;
434         card->last_numid += kcontrol->count;
435         count = kcontrol->count;
436         up_write(&card->controls_rwsem);
437         for (idx = 0; idx < count; idx++, id.index++, id.numid++)
438                 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
439         return 0;
440
441 error:
442         snd_ctl_free_one(kcontrol);
443         return ret;
444 }
445 EXPORT_SYMBOL(snd_ctl_replace);
446
447 /**
448  * snd_ctl_remove - remove the control from the card and release it
449  * @card: the card instance
450  * @kcontrol: the control instance to remove
451  *
452  * Removes the control from the card and then releases the instance.
453  * You don't need to call snd_ctl_free_one(). You must be in
454  * the write lock - down_write(&card->controls_rwsem).
455  * 
456  * Returns 0 if successful, or a negative error code on failure.
457  */
458 int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol)
459 {
460         struct snd_ctl_elem_id id;
461         unsigned int idx;
462
463         if (snd_BUG_ON(!card || !kcontrol))
464                 return -EINVAL;
465         list_del(&kcontrol->list);
466         card->controls_count -= kcontrol->count;
467         id = kcontrol->id;
468         for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
469                 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id);
470         snd_ctl_free_one(kcontrol);
471         return 0;
472 }
473
474 EXPORT_SYMBOL(snd_ctl_remove);
475
476 /**
477  * snd_ctl_remove_id - remove the control of the given id and release it
478  * @card: the card instance
479  * @id: the control id to remove
480  *
481  * Finds the control instance with the given id, removes it from the
482  * card list and releases it.
483  * 
484  * Returns 0 if successful, or a negative error code on failure.
485  */
486 int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id)
487 {
488         struct snd_kcontrol *kctl;
489         int ret;
490
491         down_write(&card->controls_rwsem);
492         kctl = snd_ctl_find_id(card, id);
493         if (kctl == NULL) {
494                 up_write(&card->controls_rwsem);
495                 return -ENOENT;
496         }
497         ret = snd_ctl_remove(card, kctl);
498         up_write(&card->controls_rwsem);
499         return ret;
500 }
501
502 EXPORT_SYMBOL(snd_ctl_remove_id);
503
504 /**
505  * snd_ctl_remove_user_ctl - remove and release the unlocked user control
506  * @file: active control handle
507  * @id: the control id to remove
508  *
509  * Finds the control instance with the given id, removes it from the
510  * card list and releases it.
511  * 
512  * Returns 0 if successful, or a negative error code on failure.
513  */
514 static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file,
515                                    struct snd_ctl_elem_id *id)
516 {
517         struct snd_card *card = file->card;
518         struct snd_kcontrol *kctl;
519         int idx, ret;
520
521         down_write(&card->controls_rwsem);
522         kctl = snd_ctl_find_id(card, id);
523         if (kctl == NULL) {
524                 ret = -ENOENT;
525                 goto error;
526         }
527         if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) {
528                 ret = -EINVAL;
529                 goto error;
530         }
531         for (idx = 0; idx < kctl->count; idx++)
532                 if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {
533                         ret = -EBUSY;
534                         goto error;
535                 }
536         ret = snd_ctl_remove(card, kctl);
537         if (ret < 0)
538                 goto error;
539         card->user_ctl_count--;
540 error:
541         up_write(&card->controls_rwsem);
542         return ret;
543 }
544
545 /**
546  * snd_ctl_activate_id - activate/inactivate the control of the given id
547  * @card: the card instance
548  * @id: the control id to activate/inactivate
549  * @active: non-zero to activate
550  *
551  * Finds the control instance with the given id, and activate or
552  * inactivate the control together with notification, if changed.
553  *
554  * Returns 0 if unchanged, 1 if changed, or a negative error code on failure.
555  */
556 int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id,
557                         int active)
558 {
559         struct snd_kcontrol *kctl;
560         struct snd_kcontrol_volatile *vd;
561         unsigned int index_offset;
562         int ret;
563
564         down_write(&card->controls_rwsem);
565         kctl = snd_ctl_find_id(card, id);
566         if (kctl == NULL) {
567                 ret = -ENOENT;
568                 goto unlock;
569         }
570         index_offset = snd_ctl_get_ioff(kctl, &kctl->id);
571         vd = &kctl->vd[index_offset];
572         ret = 0;
573         if (active) {
574                 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE))
575                         goto unlock;
576                 vd->access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
577         } else {
578                 if (vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)
579                         goto unlock;
580                 vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
581         }
582         ret = 1;
583  unlock:
584         up_write(&card->controls_rwsem);
585         if (ret > 0)
586                 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, id);
587         return ret;
588 }
589 EXPORT_SYMBOL_GPL(snd_ctl_activate_id);
590
591 /**
592  * snd_ctl_rename_id - replace the id of a control on the card
593  * @card: the card instance
594  * @src_id: the old id
595  * @dst_id: the new id
596  *
597  * Finds the control with the old id from the card, and replaces the
598  * id with the new one.
599  *
600  * Returns zero if successful, or a negative error code on failure.
601  */
602 int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id,
603                       struct snd_ctl_elem_id *dst_id)
604 {
605         struct snd_kcontrol *kctl;
606
607         down_write(&card->controls_rwsem);
608         kctl = snd_ctl_find_id(card, src_id);
609         if (kctl == NULL) {
610                 up_write(&card->controls_rwsem);
611                 return -ENOENT;
612         }
613         kctl->id = *dst_id;
614         kctl->id.numid = card->last_numid + 1;
615         card->last_numid += kctl->count;
616         up_write(&card->controls_rwsem);
617         return 0;
618 }
619
620 EXPORT_SYMBOL(snd_ctl_rename_id);
621
622 /**
623  * snd_ctl_find_numid - find the control instance with the given number-id
624  * @card: the card instance
625  * @numid: the number-id to search
626  *
627  * Finds the control instance with the given number-id from the card.
628  *
629  * Returns the pointer of the instance if found, or NULL if not.
630  *
631  * The caller must down card->controls_rwsem before calling this function
632  * (if the race condition can happen).
633  */
634 struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid)
635 {
636         struct snd_kcontrol *kctl;
637
638         if (snd_BUG_ON(!card || !numid))
639                 return NULL;
640         list_for_each_entry(kctl, &card->controls, list) {
641                 if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid)
642                         return kctl;
643         }
644         return NULL;
645 }
646
647 EXPORT_SYMBOL(snd_ctl_find_numid);
648
649 /**
650  * snd_ctl_find_id - find the control instance with the given id
651  * @card: the card instance
652  * @id: the id to search
653  *
654  * Finds the control instance with the given id from the card.
655  *
656  * Returns the pointer of the instance if found, or NULL if not.
657  *
658  * The caller must down card->controls_rwsem before calling this function
659  * (if the race condition can happen).
660  */
661 struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card,
662                                      struct snd_ctl_elem_id *id)
663 {
664         struct snd_kcontrol *kctl;
665
666         if (snd_BUG_ON(!card || !id))
667                 return NULL;
668         if (id->numid != 0)
669                 return snd_ctl_find_numid(card, id->numid);
670         list_for_each_entry(kctl, &card->controls, list) {
671                 if (kctl->id.iface != id->iface)
672                         continue;
673                 if (kctl->id.device != id->device)
674                         continue;
675                 if (kctl->id.subdevice != id->subdevice)
676                         continue;
677                 if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name)))
678                         continue;
679                 if (kctl->id.index > id->index)
680                         continue;
681                 if (kctl->id.index + kctl->count <= id->index)
682                         continue;
683                 return kctl;
684         }
685         return NULL;
686 }
687
688 EXPORT_SYMBOL(snd_ctl_find_id);
689
690 static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,
691                              unsigned int cmd, void __user *arg)
692 {
693         struct snd_ctl_card_info *info;
694
695         info = kzalloc(sizeof(*info), GFP_KERNEL);
696         if (! info)
697                 return -ENOMEM;
698         down_read(&snd_ioctl_rwsem);
699         info->card = card->number;
700         strlcpy(info->id, card->id, sizeof(info->id));
701         strlcpy(info->driver, card->driver, sizeof(info->driver));
702         strlcpy(info->name, card->shortname, sizeof(info->name));
703         strlcpy(info->longname, card->longname, sizeof(info->longname));
704         strlcpy(info->mixername, card->mixername, sizeof(info->mixername));
705         strlcpy(info->components, card->components, sizeof(info->components));
706         up_read(&snd_ioctl_rwsem);
707         if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) {
708                 kfree(info);
709                 return -EFAULT;
710         }
711         kfree(info);
712         return 0;
713 }
714
715 static int snd_ctl_elem_list(struct snd_card *card,
716                              struct snd_ctl_elem_list __user *_list)
717 {
718         struct list_head *plist;
719         struct snd_ctl_elem_list list;
720         struct snd_kcontrol *kctl;
721         struct snd_ctl_elem_id *dst, *id;
722         unsigned int offset, space, jidx;
723         
724         if (copy_from_user(&list, _list, sizeof(list)))
725                 return -EFAULT;
726         offset = list.offset;
727         space = list.space;
728         /* try limit maximum space */
729         if (space > 16384)
730                 return -ENOMEM;
731         if (space > 0) {
732                 /* allocate temporary buffer for atomic operation */
733                 dst = vmalloc(space * sizeof(struct snd_ctl_elem_id));
734                 if (dst == NULL)
735                         return -ENOMEM;
736                 down_read(&card->controls_rwsem);
737                 list.count = card->controls_count;
738                 plist = card->controls.next;
739                 while (plist != &card->controls) {
740                         if (offset == 0)
741                                 break;
742                         kctl = snd_kcontrol(plist);
743                         if (offset < kctl->count)
744                                 break;
745                         offset -= kctl->count;
746                         plist = plist->next;
747                 }
748                 list.used = 0;
749                 id = dst;
750                 while (space > 0 && plist != &card->controls) {
751                         kctl = snd_kcontrol(plist);
752                         for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) {
753                                 snd_ctl_build_ioff(id, kctl, jidx);
754                                 id++;
755                                 space--;
756                                 list.used++;
757                         }
758                         plist = plist->next;
759                         offset = 0;
760                 }
761                 up_read(&card->controls_rwsem);
762                 if (list.used > 0 &&
763                     copy_to_user(list.pids, dst,
764                                  list.used * sizeof(struct snd_ctl_elem_id))) {
765                         vfree(dst);
766                         return -EFAULT;
767                 }
768                 vfree(dst);
769         } else {
770                 down_read(&card->controls_rwsem);
771                 list.count = card->controls_count;
772                 up_read(&card->controls_rwsem);
773         }
774         if (copy_to_user(_list, &list, sizeof(list)))
775                 return -EFAULT;
776         return 0;
777 }
778
779 static int snd_ctl_elem_info(struct snd_ctl_file *ctl,
780                              struct snd_ctl_elem_info *info)
781 {
782         struct snd_card *card = ctl->card;
783         struct snd_kcontrol *kctl;
784         struct snd_kcontrol_volatile *vd;
785         unsigned int index_offset;
786         int result;
787         
788         down_read(&card->controls_rwsem);
789         kctl = snd_ctl_find_id(card, &info->id);
790         if (kctl == NULL) {
791                 up_read(&card->controls_rwsem);
792                 return -ENOENT;
793         }
794 #ifdef CONFIG_SND_DEBUG
795         info->access = 0;
796 #endif
797         result = kctl->info(kctl, info);
798         if (result >= 0) {
799                 snd_BUG_ON(info->access);
800                 index_offset = snd_ctl_get_ioff(kctl, &info->id);
801                 vd = &kctl->vd[index_offset];
802                 snd_ctl_build_ioff(&info->id, kctl, index_offset);
803                 info->access = vd->access;
804                 if (vd->owner) {
805                         info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK;
806                         if (vd->owner == ctl)
807                                 info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER;
808                         info->owner = pid_vnr(vd->owner->pid);
809                 } else {
810                         info->owner = -1;
811                 }
812         }
813         up_read(&card->controls_rwsem);
814         return result;
815 }
816
817 static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,
818                                   struct snd_ctl_elem_info __user *_info)
819 {
820         struct snd_ctl_elem_info info;
821         int result;
822
823         if (copy_from_user(&info, _info, sizeof(info)))
824                 return -EFAULT;
825         snd_power_lock(ctl->card);
826         result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
827         if (result >= 0)
828                 result = snd_ctl_elem_info(ctl, &info);
829         snd_power_unlock(ctl->card);
830         if (result >= 0)
831                 if (copy_to_user(_info, &info, sizeof(info)))
832                         return -EFAULT;
833         return result;
834 }
835
836 static int snd_ctl_elem_read(struct snd_card *card,
837                              struct snd_ctl_elem_value *control)
838 {
839         struct snd_kcontrol *kctl;
840         struct snd_kcontrol_volatile *vd;
841         unsigned int index_offset;
842         int result;
843
844         down_read(&card->controls_rwsem);
845         kctl = snd_ctl_find_id(card, &control->id);
846         if (kctl == NULL) {
847                 result = -ENOENT;
848         } else {
849                 index_offset = snd_ctl_get_ioff(kctl, &control->id);
850                 vd = &kctl->vd[index_offset];
851                 if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) &&
852                     kctl->get != NULL) {
853                         snd_ctl_build_ioff(&control->id, kctl, index_offset);
854                         result = kctl->get(kctl, control);
855                 } else
856                         result = -EPERM;
857         }
858         up_read(&card->controls_rwsem);
859         return result;
860 }
861
862 static int snd_ctl_elem_read_user(struct snd_card *card,
863                                   struct snd_ctl_elem_value __user *_control)
864 {
865         struct snd_ctl_elem_value *control;
866         int result;
867
868         control = memdup_user(_control, sizeof(*control));
869         if (IS_ERR(control))
870                 return PTR_ERR(control);
871
872         snd_power_lock(card);
873         result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
874         if (result >= 0)
875                 result = snd_ctl_elem_read(card, control);
876         snd_power_unlock(card);
877         if (result >= 0)
878                 if (copy_to_user(_control, control, sizeof(*control)))
879                         result = -EFAULT;
880         kfree(control);
881         return result;
882 }
883
884 static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file,
885                               struct snd_ctl_elem_value *control)
886 {
887         struct snd_kcontrol *kctl;
888         struct snd_kcontrol_volatile *vd;
889         unsigned int index_offset;
890         int result;
891
892         down_read(&card->controls_rwsem);
893         kctl = snd_ctl_find_id(card, &control->id);
894         if (kctl == NULL) {
895                 result = -ENOENT;
896         } else {
897                 index_offset = snd_ctl_get_ioff(kctl, &control->id);
898                 vd = &kctl->vd[index_offset];
899                 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) ||
900                     kctl->put == NULL ||
901                     (file && vd->owner && vd->owner != file)) {
902                         result = -EPERM;
903                 } else {
904                         snd_ctl_build_ioff(&control->id, kctl, index_offset);
905                         result = kctl->put(kctl, control);
906                 }
907                 if (result > 0) {
908                         struct snd_ctl_elem_id id = control->id;
909                         up_read(&card->controls_rwsem);
910                         snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &id);
911                         return 0;
912                 }
913         }
914         up_read(&card->controls_rwsem);
915         return result;
916 }
917
918 static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
919                                    struct snd_ctl_elem_value __user *_control)
920 {
921         struct snd_ctl_elem_value *control;
922         struct snd_card *card;
923         int result;
924
925         control = memdup_user(_control, sizeof(*control));
926         if (IS_ERR(control))
927                 return PTR_ERR(control);
928
929         card = file->card;
930         snd_power_lock(card);
931         result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
932         if (result >= 0)
933                 result = snd_ctl_elem_write(card, file, control);
934         snd_power_unlock(card);
935         if (result >= 0)
936                 if (copy_to_user(_control, control, sizeof(*control)))
937                         result = -EFAULT;
938         kfree(control);
939         return result;
940 }
941
942 static int snd_ctl_elem_lock(struct snd_ctl_file *file,
943                              struct snd_ctl_elem_id __user *_id)
944 {
945         struct snd_card *card = file->card;
946         struct snd_ctl_elem_id id;
947         struct snd_kcontrol *kctl;
948         struct snd_kcontrol_volatile *vd;
949         int result;
950         
951         if (copy_from_user(&id, _id, sizeof(id)))
952                 return -EFAULT;
953         down_write(&card->controls_rwsem);
954         kctl = snd_ctl_find_id(card, &id);
955         if (kctl == NULL) {
956                 result = -ENOENT;
957         } else {
958                 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
959                 if (vd->owner != NULL)
960                         result = -EBUSY;
961                 else {
962                         vd->owner = file;
963                         result = 0;
964                 }
965         }
966         up_write(&card->controls_rwsem);
967         return result;
968 }
969
970 static int snd_ctl_elem_unlock(struct snd_ctl_file *file,
971                                struct snd_ctl_elem_id __user *_id)
972 {
973         struct snd_card *card = file->card;
974         struct snd_ctl_elem_id id;
975         struct snd_kcontrol *kctl;
976         struct snd_kcontrol_volatile *vd;
977         int result;
978         
979         if (copy_from_user(&id, _id, sizeof(id)))
980                 return -EFAULT;
981         down_write(&card->controls_rwsem);
982         kctl = snd_ctl_find_id(card, &id);
983         if (kctl == NULL) {
984                 result = -ENOENT;
985         } else {
986                 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
987                 if (vd->owner == NULL)
988                         result = -EINVAL;
989                 else if (vd->owner != file)
990                         result = -EPERM;
991                 else {
992                         vd->owner = NULL;
993                         result = 0;
994                 }
995         }
996         up_write(&card->controls_rwsem);
997         return result;
998 }
999
1000 struct user_element {
1001         struct snd_ctl_elem_info info;
1002         struct snd_card *card;
1003         void *elem_data;                /* element data */
1004         unsigned long elem_data_size;   /* size of element data in bytes */
1005         void *tlv_data;                 /* TLV data */
1006         unsigned long tlv_data_size;    /* TLV data size */
1007         void *priv_data;                /* private data (like strings for enumerated type) */
1008 };
1009
1010 static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol,
1011                                   struct snd_ctl_elem_info *uinfo)
1012 {
1013         struct user_element *ue = kcontrol->private_data;
1014
1015         *uinfo = ue->info;
1016         return 0;
1017 }
1018
1019 static int snd_ctl_elem_user_enum_info(struct snd_kcontrol *kcontrol,
1020                                        struct snd_ctl_elem_info *uinfo)
1021 {
1022         struct user_element *ue = kcontrol->private_data;
1023         const char *names;
1024         unsigned int item;
1025
1026         item = uinfo->value.enumerated.item;
1027
1028         *uinfo = ue->info;
1029
1030         item = min(item, uinfo->value.enumerated.items - 1);
1031         uinfo->value.enumerated.item = item;
1032
1033         names = ue->priv_data;
1034         for (; item > 0; --item)
1035                 names += strlen(names) + 1;
1036         strcpy(uinfo->value.enumerated.name, names);
1037
1038         return 0;
1039 }
1040
1041 static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol,
1042                                  struct snd_ctl_elem_value *ucontrol)
1043 {
1044         struct user_element *ue = kcontrol->private_data;
1045
1046         mutex_lock(&ue->card->user_ctl_lock);
1047         memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size);
1048         mutex_unlock(&ue->card->user_ctl_lock);
1049         return 0;
1050 }
1051
1052 static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol,
1053                                  struct snd_ctl_elem_value *ucontrol)
1054 {
1055         int change;
1056         struct user_element *ue = kcontrol->private_data;
1057
1058         mutex_lock(&ue->card->user_ctl_lock);
1059         change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0;
1060         if (change)
1061                 memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size);
1062         mutex_unlock(&ue->card->user_ctl_lock);
1063         return change;
1064 }
1065
1066 static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol,
1067                                  int op_flag,
1068                                  unsigned int size,
1069                                  unsigned int __user *tlv)
1070 {
1071         struct user_element *ue = kcontrol->private_data;
1072         int change = 0;
1073         void *new_data;
1074
1075         if (op_flag > 0) {
1076                 if (size > 1024 * 128)  /* sane value */
1077                         return -EINVAL;
1078
1079                 new_data = memdup_user(tlv, size);
1080                 if (IS_ERR(new_data))
1081                         return PTR_ERR(new_data);
1082                 mutex_lock(&ue->card->user_ctl_lock);
1083                 change = ue->tlv_data_size != size;
1084                 if (!change)
1085                         change = memcmp(ue->tlv_data, new_data, size);
1086                 kfree(ue->tlv_data);
1087                 ue->tlv_data = new_data;
1088                 ue->tlv_data_size = size;
1089                 mutex_unlock(&ue->card->user_ctl_lock);
1090         } else {
1091                 int ret = 0;
1092
1093                 mutex_lock(&ue->card->user_ctl_lock);
1094                 if (!ue->tlv_data_size || !ue->tlv_data) {
1095                         ret = -ENXIO;
1096                         goto err_unlock;
1097                 }
1098                 if (size < ue->tlv_data_size) {
1099                         ret = -ENOSPC;
1100                         goto err_unlock;
1101                 }
1102                 if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size))
1103                         ret = -EFAULT;
1104 err_unlock:
1105                 mutex_unlock(&ue->card->user_ctl_lock);
1106                 if (ret)
1107                         return ret;
1108         }
1109         return change;
1110 }
1111
1112 static int snd_ctl_elem_init_enum_names(struct user_element *ue)
1113 {
1114         char *names, *p;
1115         size_t buf_len, name_len;
1116         unsigned int i;
1117         const uintptr_t user_ptrval = ue->info.value.enumerated.names_ptr;
1118
1119         if (ue->info.value.enumerated.names_length > 64 * 1024)
1120                 return -EINVAL;
1121
1122         names = memdup_user((const void __user *)user_ptrval,
1123                 ue->info.value.enumerated.names_length);
1124         if (IS_ERR(names))
1125                 return PTR_ERR(names);
1126
1127         /* check that there are enough valid names */
1128         buf_len = ue->info.value.enumerated.names_length;
1129         p = names;
1130         for (i = 0; i < ue->info.value.enumerated.items; ++i) {
1131                 name_len = strnlen(p, buf_len);
1132                 if (name_len == 0 || name_len >= 64 || name_len == buf_len) {
1133                         kfree(names);
1134                         return -EINVAL;
1135                 }
1136                 p += name_len + 1;
1137                 buf_len -= name_len + 1;
1138         }
1139
1140         ue->priv_data = names;
1141         ue->info.value.enumerated.names_ptr = 0;
1142
1143         return 0;
1144 }
1145
1146 static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol)
1147 {
1148         struct user_element *ue = kcontrol->private_data;
1149
1150         kfree(ue->tlv_data);
1151         kfree(ue->priv_data);
1152         kfree(ue);
1153 }
1154
1155 static int snd_ctl_elem_add(struct snd_ctl_file *file,
1156                             struct snd_ctl_elem_info *info, int replace)
1157 {
1158         struct snd_card *card = file->card;
1159         struct snd_kcontrol kctl, *_kctl;
1160         unsigned int access;
1161         long private_size;
1162         struct user_element *ue;
1163         int idx, err;
1164
1165         if (info->count < 1)
1166                 return -EINVAL;
1167         if (!*info->id.name)
1168                 return -EINVAL;
1169         if (strnlen(info->id.name, sizeof(info->id.name)) >= sizeof(info->id.name))
1170                 return -EINVAL;
1171         access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
1172                 (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
1173                                  SNDRV_CTL_ELEM_ACCESS_INACTIVE|
1174                                  SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE));
1175         info->id.numid = 0;
1176         memset(&kctl, 0, sizeof(kctl));
1177
1178         if (replace) {
1179                 err = snd_ctl_remove_user_ctl(file, &info->id);
1180                 if (err)
1181                         return err;
1182         }
1183
1184         if (card->user_ctl_count >= MAX_USER_CONTROLS)
1185                 return -ENOMEM;
1186
1187         memcpy(&kctl.id, &info->id, sizeof(info->id));
1188         kctl.count = info->owner ? info->owner : 1;
1189         access |= SNDRV_CTL_ELEM_ACCESS_USER;
1190         if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED)
1191                 kctl.info = snd_ctl_elem_user_enum_info;
1192         else
1193                 kctl.info = snd_ctl_elem_user_info;
1194         if (access & SNDRV_CTL_ELEM_ACCESS_READ)
1195                 kctl.get = snd_ctl_elem_user_get;
1196         if (access & SNDRV_CTL_ELEM_ACCESS_WRITE)
1197                 kctl.put = snd_ctl_elem_user_put;
1198         if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) {
1199                 kctl.tlv.c = snd_ctl_elem_user_tlv;
1200                 access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1201         }
1202         switch (info->type) {
1203         case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
1204         case SNDRV_CTL_ELEM_TYPE_INTEGER:
1205                 private_size = sizeof(long);
1206                 if (info->count > 128)
1207                         return -EINVAL;
1208                 break;
1209         case SNDRV_CTL_ELEM_TYPE_INTEGER64:
1210                 private_size = sizeof(long long);
1211                 if (info->count > 64)
1212                         return -EINVAL;
1213                 break;
1214         case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
1215                 private_size = sizeof(unsigned int);
1216                 if (info->count > 128 || info->value.enumerated.items == 0)
1217                         return -EINVAL;
1218                 break;
1219         case SNDRV_CTL_ELEM_TYPE_BYTES:
1220                 private_size = sizeof(unsigned char);
1221                 if (info->count > 512)
1222                         return -EINVAL;
1223                 break;
1224         case SNDRV_CTL_ELEM_TYPE_IEC958:
1225                 private_size = sizeof(struct snd_aes_iec958);
1226                 if (info->count != 1)
1227                         return -EINVAL;
1228                 break;
1229         default:
1230                 return -EINVAL;
1231         }
1232         private_size *= info->count;
1233         ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL);
1234         if (ue == NULL)
1235                 return -ENOMEM;
1236         ue->card = card;
1237         ue->info = *info;
1238         ue->info.access = 0;
1239         ue->elem_data = (char *)ue + sizeof(*ue);
1240         ue->elem_data_size = private_size;
1241         if (ue->info.type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) {
1242                 err = snd_ctl_elem_init_enum_names(ue);
1243                 if (err < 0) {
1244                         kfree(ue);
1245                         return err;
1246                 }
1247         }
1248         kctl.private_free = snd_ctl_elem_user_free;
1249         _kctl = snd_ctl_new(&kctl, access);
1250         if (_kctl == NULL) {
1251                 kfree(ue->priv_data);
1252                 kfree(ue);
1253                 return -ENOMEM;
1254         }
1255         _kctl->private_data = ue;
1256         for (idx = 0; idx < _kctl->count; idx++)
1257                 _kctl->vd[idx].owner = file;
1258         err = snd_ctl_add(card, _kctl);
1259         if (err < 0)
1260                 return err;
1261
1262         down_write(&card->controls_rwsem);
1263         card->user_ctl_count++;
1264         up_write(&card->controls_rwsem);
1265
1266         return 0;
1267 }
1268
1269 static int snd_ctl_elem_add_user(struct snd_ctl_file *file,
1270                                  struct snd_ctl_elem_info __user *_info, int replace)
1271 {
1272         struct snd_ctl_elem_info info;
1273         if (copy_from_user(&info, _info, sizeof(info)))
1274                 return -EFAULT;
1275         return snd_ctl_elem_add(file, &info, replace);
1276 }
1277
1278 static int snd_ctl_elem_remove(struct snd_ctl_file *file,
1279                                struct snd_ctl_elem_id __user *_id)
1280 {
1281         struct snd_ctl_elem_id id;
1282
1283         if (copy_from_user(&id, _id, sizeof(id)))
1284                 return -EFAULT;
1285         return snd_ctl_remove_user_ctl(file, &id);
1286 }
1287
1288 static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr)
1289 {
1290         int subscribe;
1291         if (get_user(subscribe, ptr))
1292                 return -EFAULT;
1293         if (subscribe < 0) {
1294                 subscribe = file->subscribed;
1295                 if (put_user(subscribe, ptr))
1296                         return -EFAULT;
1297                 return 0;
1298         }
1299         if (subscribe) {
1300                 file->subscribed = 1;
1301                 return 0;
1302         } else if (file->subscribed) {
1303                 snd_ctl_empty_read_queue(file);
1304                 file->subscribed = 0;
1305         }
1306         return 0;
1307 }
1308
1309 static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file,
1310                              struct snd_ctl_tlv __user *_tlv,
1311                              int op_flag)
1312 {
1313         struct snd_card *card = file->card;
1314         struct snd_ctl_tlv tlv;
1315         struct snd_kcontrol *kctl;
1316         struct snd_kcontrol_volatile *vd;
1317         unsigned int len;
1318         int err = 0;
1319
1320         if (copy_from_user(&tlv, _tlv, sizeof(tlv)))
1321                 return -EFAULT;
1322         if (tlv.length < sizeof(unsigned int) * 2)
1323                 return -EINVAL;
1324         down_read(&card->controls_rwsem);
1325         kctl = snd_ctl_find_numid(card, tlv.numid);
1326         if (kctl == NULL) {
1327                 err = -ENOENT;
1328                 goto __kctl_end;
1329         }
1330         if (kctl->tlv.p == NULL) {
1331                 err = -ENXIO;
1332                 goto __kctl_end;
1333         }
1334         vd = &kctl->vd[tlv.numid - kctl->id.numid];
1335         if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) ||
1336             (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) ||
1337             (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) {
1338                 err = -ENXIO;
1339                 goto __kctl_end;
1340         }
1341         if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) {
1342                 if (vd->owner != NULL && vd->owner != file) {
1343                         err = -EPERM;
1344                         goto __kctl_end;
1345                 }
1346                 err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv); 
1347                 if (err > 0) {
1348                         struct snd_ctl_elem_id id = kctl->id;
1349                         up_read(&card->controls_rwsem);
1350                         snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &id);
1351                         return 0;
1352                 }
1353         } else {
1354                 if (op_flag) {
1355                         err = -ENXIO;
1356                         goto __kctl_end;
1357                 }
1358                 len = kctl->tlv.p[1] + 2 * sizeof(unsigned int);
1359                 if (tlv.length < len) {
1360                         err = -ENOMEM;
1361                         goto __kctl_end;
1362                 }
1363                 if (copy_to_user(_tlv->tlv, kctl->tlv.p, len))
1364                         err = -EFAULT;
1365         }
1366       __kctl_end:
1367         up_read(&card->controls_rwsem);
1368         return err;
1369 }
1370
1371 static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1372 {
1373         struct snd_ctl_file *ctl;
1374         struct snd_card *card;
1375         struct snd_kctl_ioctl *p;
1376         void __user *argp = (void __user *)arg;
1377         int __user *ip = argp;
1378         int err;
1379
1380         ctl = file->private_data;
1381         card = ctl->card;
1382         if (snd_BUG_ON(!card))
1383                 return -ENXIO;
1384         switch (cmd) {
1385         case SNDRV_CTL_IOCTL_PVERSION:
1386                 return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0;
1387         case SNDRV_CTL_IOCTL_CARD_INFO:
1388                 return snd_ctl_card_info(card, ctl, cmd, argp);
1389         case SNDRV_CTL_IOCTL_ELEM_LIST:
1390                 return snd_ctl_elem_list(card, argp);
1391         case SNDRV_CTL_IOCTL_ELEM_INFO:
1392                 return snd_ctl_elem_info_user(ctl, argp);
1393         case SNDRV_CTL_IOCTL_ELEM_READ:
1394                 return snd_ctl_elem_read_user(card, argp);
1395         case SNDRV_CTL_IOCTL_ELEM_WRITE:
1396                 return snd_ctl_elem_write_user(ctl, argp);
1397         case SNDRV_CTL_IOCTL_ELEM_LOCK:
1398                 return snd_ctl_elem_lock(ctl, argp);
1399         case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
1400                 return snd_ctl_elem_unlock(ctl, argp);
1401         case SNDRV_CTL_IOCTL_ELEM_ADD:
1402                 return snd_ctl_elem_add_user(ctl, argp, 0);
1403         case SNDRV_CTL_IOCTL_ELEM_REPLACE:
1404                 return snd_ctl_elem_add_user(ctl, argp, 1);
1405         case SNDRV_CTL_IOCTL_ELEM_REMOVE:
1406                 return snd_ctl_elem_remove(ctl, argp);
1407         case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
1408                 return snd_ctl_subscribe_events(ctl, ip);
1409         case SNDRV_CTL_IOCTL_TLV_READ:
1410                 return snd_ctl_tlv_ioctl(ctl, argp, 0);
1411         case SNDRV_CTL_IOCTL_TLV_WRITE:
1412                 return snd_ctl_tlv_ioctl(ctl, argp, 1);
1413         case SNDRV_CTL_IOCTL_TLV_COMMAND:
1414                 return snd_ctl_tlv_ioctl(ctl, argp, -1);
1415         case SNDRV_CTL_IOCTL_POWER:
1416                 return -ENOPROTOOPT;
1417         case SNDRV_CTL_IOCTL_POWER_STATE:
1418 #ifdef CONFIG_PM
1419                 return put_user(card->power_state, ip) ? -EFAULT : 0;
1420 #else
1421                 return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0;
1422 #endif
1423         }
1424         down_read(&snd_ioctl_rwsem);
1425         list_for_each_entry(p, &snd_control_ioctls, list) {
1426                 err = p->fioctl(card, ctl, cmd, arg);
1427                 if (err != -ENOIOCTLCMD) {
1428                         up_read(&snd_ioctl_rwsem);
1429                         return err;
1430                 }
1431         }
1432         up_read(&snd_ioctl_rwsem);
1433         snd_printdd("unknown ioctl = 0x%x\n", cmd);
1434         return -ENOTTY;
1435 }
1436
1437 static ssize_t snd_ctl_read(struct file *file, char __user *buffer,
1438                             size_t count, loff_t * offset)
1439 {
1440         struct snd_ctl_file *ctl;
1441         int err = 0;
1442         ssize_t result = 0;
1443
1444         ctl = file->private_data;
1445         if (snd_BUG_ON(!ctl || !ctl->card))
1446                 return -ENXIO;
1447         if (!ctl->subscribed)
1448                 return -EBADFD;
1449         if (count < sizeof(struct snd_ctl_event))
1450                 return -EINVAL;
1451         spin_lock_irq(&ctl->read_lock);
1452         while (count >= sizeof(struct snd_ctl_event)) {
1453                 struct snd_ctl_event ev;
1454                 struct snd_kctl_event *kev;
1455                 while (list_empty(&ctl->events)) {
1456                         wait_queue_t wait;
1457                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1458                                 err = -EAGAIN;
1459                                 goto __end_lock;
1460                         }
1461                         init_waitqueue_entry(&wait, current);
1462                         add_wait_queue(&ctl->change_sleep, &wait);
1463                         set_current_state(TASK_INTERRUPTIBLE);
1464                         spin_unlock_irq(&ctl->read_lock);
1465                         schedule();
1466                         remove_wait_queue(&ctl->change_sleep, &wait);
1467                         if (ctl->card->shutdown)
1468                                 return -ENODEV;
1469                         if (signal_pending(current))
1470                                 return -ERESTARTSYS;
1471                         spin_lock_irq(&ctl->read_lock);
1472                 }
1473                 kev = snd_kctl_event(ctl->events.next);
1474                 ev.type = SNDRV_CTL_EVENT_ELEM;
1475                 ev.data.elem.mask = kev->mask;
1476                 ev.data.elem.id = kev->id;
1477                 list_del(&kev->list);
1478                 spin_unlock_irq(&ctl->read_lock);
1479                 kfree(kev);
1480                 if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) {
1481                         err = -EFAULT;
1482                         goto __end;
1483                 }
1484                 spin_lock_irq(&ctl->read_lock);
1485                 buffer += sizeof(struct snd_ctl_event);
1486                 count -= sizeof(struct snd_ctl_event);
1487                 result += sizeof(struct snd_ctl_event);
1488         }
1489       __end_lock:
1490         spin_unlock_irq(&ctl->read_lock);
1491       __end:
1492         return result > 0 ? result : err;
1493 }
1494
1495 static unsigned int snd_ctl_poll(struct file *file, poll_table * wait)
1496 {
1497         unsigned int mask;
1498         struct snd_ctl_file *ctl;
1499
1500         ctl = file->private_data;
1501         if (!ctl->subscribed)
1502                 return 0;
1503         poll_wait(file, &ctl->change_sleep, wait);
1504
1505         mask = 0;
1506         if (!list_empty(&ctl->events))
1507                 mask |= POLLIN | POLLRDNORM;
1508
1509         return mask;
1510 }
1511
1512 /*
1513  * register the device-specific control-ioctls.
1514  * called from each device manager like pcm.c, hwdep.c, etc.
1515  */
1516 static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists)
1517 {
1518         struct snd_kctl_ioctl *pn;
1519
1520         pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL);
1521         if (pn == NULL)
1522                 return -ENOMEM;
1523         pn->fioctl = fcn;
1524         down_write(&snd_ioctl_rwsem);
1525         list_add_tail(&pn->list, lists);
1526         up_write(&snd_ioctl_rwsem);
1527         return 0;
1528 }
1529
1530 int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn)
1531 {
1532         return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls);
1533 }
1534
1535 EXPORT_SYMBOL(snd_ctl_register_ioctl);
1536
1537 #ifdef CONFIG_COMPAT
1538 int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1539 {
1540         return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls);
1541 }
1542
1543 EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
1544 #endif
1545
1546 /*
1547  * de-register the device-specific control-ioctls.
1548  */
1549 static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn,
1550                                      struct list_head *lists)
1551 {
1552         struct snd_kctl_ioctl *p;
1553
1554         if (snd_BUG_ON(!fcn))
1555                 return -EINVAL;
1556         down_write(&snd_ioctl_rwsem);
1557         list_for_each_entry(p, lists, list) {
1558                 if (p->fioctl == fcn) {
1559                         list_del(&p->list);
1560                         up_write(&snd_ioctl_rwsem);
1561                         kfree(p);
1562                         return 0;
1563                 }
1564         }
1565         up_write(&snd_ioctl_rwsem);
1566         snd_BUG();
1567         return -EINVAL;
1568 }
1569
1570 int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn)
1571 {
1572         return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls);
1573 }
1574
1575 EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
1576
1577 #ifdef CONFIG_COMPAT
1578 int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1579 {
1580         return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls);
1581 }
1582
1583 EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
1584 #endif
1585
1586 static int snd_ctl_fasync(int fd, struct file * file, int on)
1587 {
1588         struct snd_ctl_file *ctl;
1589
1590         ctl = file->private_data;
1591         return fasync_helper(fd, file, on, &ctl->fasync);
1592 }
1593
1594 /*
1595  * ioctl32 compat
1596  */
1597 #ifdef CONFIG_COMPAT
1598 #include "control_compat.c"
1599 #else
1600 #define snd_ctl_ioctl_compat    NULL
1601 #endif
1602
1603 /*
1604  *  INIT PART
1605  */
1606
1607 static const struct file_operations snd_ctl_f_ops =
1608 {
1609         .owner =        THIS_MODULE,
1610         .read =         snd_ctl_read,
1611         .open =         snd_ctl_open,
1612         .release =      snd_ctl_release,
1613         .llseek =       no_llseek,
1614         .poll =         snd_ctl_poll,
1615         .unlocked_ioctl =       snd_ctl_ioctl,
1616         .compat_ioctl = snd_ctl_ioctl_compat,
1617         .fasync =       snd_ctl_fasync,
1618 };
1619
1620 /*
1621  * registration of the control device
1622  */
1623 static int snd_ctl_dev_register(struct snd_device *device)
1624 {
1625         struct snd_card *card = device->device_data;
1626         int err, cardnum;
1627         char name[16];
1628
1629         if (snd_BUG_ON(!card))
1630                 return -ENXIO;
1631         cardnum = card->number;
1632         if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1633                 return -ENXIO;
1634         sprintf(name, "controlC%i", cardnum);
1635         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
1636                                        &snd_ctl_f_ops, card, name)) < 0)
1637                 return err;
1638         return 0;
1639 }
1640
1641 /*
1642  * disconnection of the control device
1643  */
1644 static int snd_ctl_dev_disconnect(struct snd_device *device)
1645 {
1646         struct snd_card *card = device->device_data;
1647         struct snd_ctl_file *ctl;
1648         int err, cardnum;
1649
1650         if (snd_BUG_ON(!card))
1651                 return -ENXIO;
1652         cardnum = card->number;
1653         if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1654                 return -ENXIO;
1655
1656         read_lock(&card->ctl_files_rwlock);
1657         list_for_each_entry(ctl, &card->ctl_files, list) {
1658                 wake_up(&ctl->change_sleep);
1659                 kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);
1660         }
1661         read_unlock(&card->ctl_files_rwlock);
1662
1663         if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL,
1664                                          card, -1)) < 0)
1665                 return err;
1666         return 0;
1667 }
1668
1669 /*
1670  * free all controls
1671  */
1672 static int snd_ctl_dev_free(struct snd_device *device)
1673 {
1674         struct snd_card *card = device->device_data;
1675         struct snd_kcontrol *control;
1676
1677         down_write(&card->controls_rwsem);
1678         while (!list_empty(&card->controls)) {
1679                 control = snd_kcontrol(card->controls.next);
1680                 snd_ctl_remove(card, control);
1681         }
1682         up_write(&card->controls_rwsem);
1683         return 0;
1684 }
1685
1686 /*
1687  * create control core:
1688  * called from init.c
1689  */
1690 int snd_ctl_create(struct snd_card *card)
1691 {
1692         static struct snd_device_ops ops = {
1693                 .dev_free = snd_ctl_dev_free,
1694                 .dev_register = snd_ctl_dev_register,
1695                 .dev_disconnect = snd_ctl_dev_disconnect,
1696         };
1697
1698         if (snd_BUG_ON(!card))
1699                 return -ENXIO;
1700         return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);
1701 }
1702
1703 /*
1704  * Frequently used control callbacks/helpers
1705  */
1706 int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
1707                               struct snd_ctl_elem_info *uinfo)
1708 {
1709         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1710         uinfo->count = 1;
1711         uinfo->value.integer.min = 0;
1712         uinfo->value.integer.max = 1;
1713         return 0;
1714 }
1715
1716 EXPORT_SYMBOL(snd_ctl_boolean_mono_info);
1717
1718 int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
1719                                 struct snd_ctl_elem_info *uinfo)
1720 {
1721         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1722         uinfo->count = 2;
1723         uinfo->value.integer.min = 0;
1724         uinfo->value.integer.max = 1;
1725         return 0;
1726 }
1727
1728 EXPORT_SYMBOL(snd_ctl_boolean_stereo_info);
1729
1730 /**
1731  * snd_ctl_enum_info - fills the info structure for an enumerated control
1732  * @info: the structure to be filled
1733  * @channels: the number of the control's channels; often one
1734  * @items: the number of control values; also the size of @names
1735  * @names: an array containing the names of all control values
1736  *
1737  * Sets all required fields in @info to their appropriate values.
1738  * If the control's accessibility is not the default (readable and writable),
1739  * the caller has to fill @info->access.
1740  */
1741 int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels,
1742                       unsigned int items, const char *const names[])
1743 {
1744         info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
1745         info->count = channels;
1746         info->value.enumerated.items = items;
1747         if (info->value.enumerated.item >= items)
1748                 info->value.enumerated.item = items - 1;
1749         strlcpy(info->value.enumerated.name,
1750                 names[info->value.enumerated.item],
1751                 sizeof(info->value.enumerated.name));
1752         return 0;
1753 }
1754 EXPORT_SYMBOL(snd_ctl_enum_info);