[ALSA] Fix mulaw -> linear conversion in OSS PCM emulation
[linux-2.6] / sound / core / init.c
1 /*
2  *  Initialization routines
3  *  Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
23 #include <linux/init.h>
24 #include <linux/sched.h>
25 #include <linux/file.h>
26 #include <linux/slab.h>
27 #include <linux/time.h>
28 #include <linux/ctype.h>
29 #include <linux/pci.h>
30 #include <linux/pm.h>
31
32 #include <sound/core.h>
33 #include <sound/control.h>
34 #include <sound/info.h>
35
36 struct snd_shutdown_f_ops {
37         struct file_operations f_ops;
38         struct snd_shutdown_f_ops *next;
39 };
40
41 unsigned int snd_cards_lock = 0;        /* locked for registering/using */
42 struct snd_card *snd_cards[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = NULL};
43 DEFINE_RWLOCK(snd_card_rwlock);
44
45 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
46 int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag);
47 #endif
48
49 #ifdef CONFIG_PROC_FS
50 static void snd_card_id_read(struct snd_info_entry *entry,
51                              struct snd_info_buffer *buffer)
52 {
53         snd_iprintf(buffer, "%s\n", entry->card->id);
54 }
55
56 static inline int init_info_for_card(struct snd_card *card)
57 {
58         int err;
59         struct snd_info_entry *entry;
60
61         if ((err = snd_info_card_register(card)) < 0) {
62                 snd_printd("unable to create card info\n");
63                 return err;
64         }
65         if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) {
66                 snd_printd("unable to create card entry\n");
67                 return err;
68         }
69         entry->c.text.read_size = PAGE_SIZE;
70         entry->c.text.read = snd_card_id_read;
71         if (snd_info_register(entry) < 0) {
72                 snd_info_free_entry(entry);
73                 entry = NULL;
74         }
75         card->proc_id = entry;
76         return 0;
77 }
78 #else /* !CONFIG_PROC_FS */
79 #define init_info_for_card(card)
80 #endif
81
82 static void snd_card_free_thread(void * __card);
83
84 /**
85  *  snd_card_new - create and initialize a soundcard structure
86  *  @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
87  *  @xid: card identification (ASCII string)
88  *  @module: top level module for locking
89  *  @extra_size: allocate this extra size after the main soundcard structure
90  *
91  *  Creates and initializes a soundcard structure.
92  *
93  *  Returns kmallocated snd_card structure. Creates the ALSA control interface
94  *  (which is blocked until snd_card_register function is called).
95  */
96 struct snd_card *snd_card_new(int idx, const char *xid,
97                          struct module *module, int extra_size)
98 {
99         struct snd_card *card;
100         int err;
101
102         if (extra_size < 0)
103                 extra_size = 0;
104         card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL);
105         if (card == NULL)
106                 return NULL;
107         if (xid) {
108                 if (!snd_info_check_reserved_words(xid))
109                         goto __error;
110                 strlcpy(card->id, xid, sizeof(card->id));
111         }
112         err = 0;
113         write_lock(&snd_card_rwlock);
114         if (idx < 0) {
115                 int idx2;
116                 for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++)
117                         if (~snd_cards_lock & idx & 1<<idx2) {
118                                 idx = idx2;
119                                 if (idx >= snd_ecards_limit)
120                                         snd_ecards_limit = idx + 1;
121                                 break;
122                         }
123         } else if (idx < snd_ecards_limit) {
124                 if (snd_cards_lock & (1 << idx))
125                         err = -ENODEV;  /* invalid */
126         } else if (idx < SNDRV_CARDS)
127                 snd_ecards_limit = idx + 1; /* increase the limit */
128         else
129                 err = -ENODEV;
130         if (idx < 0 || err < 0) {
131                 write_unlock(&snd_card_rwlock);
132                 snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i)\n", idx, snd_ecards_limit - 1);
133                 goto __error;
134         }
135         snd_cards_lock |= 1 << idx;             /* lock it */
136         write_unlock(&snd_card_rwlock);
137         card->number = idx;
138         card->module = module;
139         INIT_LIST_HEAD(&card->devices);
140         init_rwsem(&card->controls_rwsem);
141         rwlock_init(&card->ctl_files_rwlock);
142         INIT_LIST_HEAD(&card->controls);
143         INIT_LIST_HEAD(&card->ctl_files);
144         spin_lock_init(&card->files_lock);
145         init_waitqueue_head(&card->shutdown_sleep);
146         INIT_WORK(&card->free_workq, snd_card_free_thread, card);
147 #ifdef CONFIG_PM
148         mutex_init(&card->power_lock);
149         init_waitqueue_head(&card->power_sleep);
150 #endif
151         /* the control interface cannot be accessed from the user space until */
152         /* snd_cards_bitmask and snd_cards are set with snd_card_register */
153         if ((err = snd_ctl_create(card)) < 0) {
154                 snd_printd("unable to register control minors\n");
155                 goto __error;
156         }
157         if ((err = snd_info_card_create(card)) < 0) {
158                 snd_printd("unable to create card info\n");
159                 goto __error_ctl;
160         }
161         if (extra_size > 0)
162                 card->private_data = (char *)card + sizeof(struct snd_card);
163         return card;
164
165       __error_ctl:
166         snd_device_free_all(card, SNDRV_DEV_CMD_PRE);
167       __error:
168         kfree(card);
169         return NULL;
170 }
171
172 static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait)
173 {
174         return POLLERR | POLLNVAL;
175 }
176
177 /**
178  *  snd_card_disconnect - disconnect all APIs from the file-operations (user space)
179  *  @card: soundcard structure
180  *
181  *  Disconnects all APIs from the file-operations (user space).
182  *
183  *  Returns zero, otherwise a negative error code.
184  *
185  *  Note: The current implementation replaces all active file->f_op with special
186  *        dummy file operations (they do nothing except release).
187  */
188 int snd_card_disconnect(struct snd_card *card)
189 {
190         struct snd_monitor_file *mfile;
191         struct file *file;
192         struct snd_shutdown_f_ops *s_f_ops;
193         struct file_operations *f_ops, *old_f_ops;
194         int err;
195
196         spin_lock(&card->files_lock);
197         if (card->shutdown) {
198                 spin_unlock(&card->files_lock);
199                 return 0;
200         }
201         card->shutdown = 1;
202         spin_unlock(&card->files_lock);
203
204         /* phase 1: disable fops (user space) operations for ALSA API */
205         write_lock(&snd_card_rwlock);
206         snd_cards[card->number] = NULL;
207         write_unlock(&snd_card_rwlock);
208         
209         /* phase 2: replace file->f_op with special dummy operations */
210         
211         spin_lock(&card->files_lock);
212         mfile = card->files;
213         while (mfile) {
214                 file = mfile->file;
215
216                 /* it's critical part, use endless loop */
217                 /* we have no room to fail */
218                 s_f_ops = kmalloc(sizeof(struct snd_shutdown_f_ops), GFP_ATOMIC);
219                 if (s_f_ops == NULL)
220                         panic("Atomic allocation failed for snd_shutdown_f_ops!");
221
222                 f_ops = &s_f_ops->f_ops;
223
224                 memset(f_ops, 0, sizeof(*f_ops));
225                 f_ops->owner = file->f_op->owner;
226                 f_ops->release = file->f_op->release;
227                 f_ops->poll = snd_disconnect_poll;
228
229                 s_f_ops->next = card->s_f_ops;
230                 card->s_f_ops = s_f_ops;
231                 
232                 f_ops = fops_get(f_ops);
233
234                 old_f_ops = file->f_op;
235                 file->f_op = f_ops;     /* must be atomic */
236                 fops_put(old_f_ops);
237                 
238                 mfile = mfile->next;
239         }
240         spin_unlock(&card->files_lock); 
241
242         /* phase 3: notify all connected devices about disconnection */
243         /* at this point, they cannot respond to any calls except release() */
244
245 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
246         if (snd_mixer_oss_notify_callback)
247                 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT);
248 #endif
249
250         /* notify all devices that we are disconnected */
251         err = snd_device_disconnect_all(card);
252         if (err < 0)
253                 snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number);
254
255         return 0;       
256 }
257
258 /**
259  *  snd_card_free - frees given soundcard structure
260  *  @card: soundcard structure
261  *
262  *  This function releases the soundcard structure and the all assigned
263  *  devices automatically.  That is, you don't have to release the devices
264  *  by yourself.
265  *
266  *  Returns zero. Frees all associated devices and frees the control
267  *  interface associated to given soundcard.
268  */
269 int snd_card_free(struct snd_card *card)
270 {
271         struct snd_shutdown_f_ops *s_f_ops;
272
273         if (card == NULL)
274                 return -EINVAL;
275         write_lock(&snd_card_rwlock);
276         snd_cards[card->number] = NULL;
277         write_unlock(&snd_card_rwlock);
278
279 #ifdef CONFIG_PM
280         wake_up(&card->power_sleep);
281 #endif
282         /* wait, until all devices are ready for the free operation */
283         wait_event(card->shutdown_sleep, card->files == NULL);
284
285 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
286         if (snd_mixer_oss_notify_callback)
287                 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE);
288 #endif
289         if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) {
290                 snd_printk(KERN_ERR "unable to free all devices (pre)\n");
291                 /* Fatal, but this situation should never occur */
292         }
293         if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) {
294                 snd_printk(KERN_ERR "unable to free all devices (normal)\n");
295                 /* Fatal, but this situation should never occur */
296         }
297         if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) {
298                 snd_printk(KERN_ERR "unable to free all devices (post)\n");
299                 /* Fatal, but this situation should never occur */
300         }
301         if (card->private_free)
302                 card->private_free(card);
303         snd_info_unregister(card->proc_id);
304         if (snd_info_card_free(card) < 0) {
305                 snd_printk(KERN_WARNING "unable to free card info\n");
306                 /* Not fatal error */
307         }
308         while (card->s_f_ops) {
309                 s_f_ops = card->s_f_ops;
310                 card->s_f_ops = s_f_ops->next;
311                 kfree(s_f_ops);
312         }
313         write_lock(&snd_card_rwlock);
314         snd_cards_lock &= ~(1 << card->number);
315         write_unlock(&snd_card_rwlock);
316         kfree(card);
317         return 0;
318 }
319
320 static void snd_card_free_thread(void * __card)
321 {
322         struct snd_card *card = __card;
323         struct module * module = card->module;
324
325         if (!try_module_get(module)) {
326                 snd_printk(KERN_ERR "unable to lock toplevel module for card %i in free thread\n", card->number);
327                 module = NULL;
328         }
329
330         snd_card_free(card);
331
332         module_put(module);
333 }
334
335 /**
336  *  snd_card_free_in_thread - call snd_card_free() in thread
337  *  @card: soundcard structure
338  *
339  *  This function schedules the call of snd_card_free() function in a
340  *  work queue.  When all devices are released (non-busy), the work
341  *  is woken up and calls snd_card_free().
342  *
343  *  When a card can be disconnected at any time by hotplug service,
344  *  this function should be used in disconnect (or detach) callback
345  *  instead of calling snd_card_free() directly.
346  *  
347  *  Returns - zero otherwise a negative error code if the start of thread failed.
348  */
349 int snd_card_free_in_thread(struct snd_card *card)
350 {
351         if (card->files == NULL) {
352                 snd_card_free(card);
353                 return 0;
354         }
355
356         if (schedule_work(&card->free_workq))
357                 return 0;
358
359         snd_printk(KERN_ERR "schedule_work() failed in snd_card_free_in_thread for card %i\n", card->number);
360         /* try to free the structure immediately */
361         snd_card_free(card);
362         return -EFAULT;
363 }
364
365 static void choose_default_id(struct snd_card *card)
366 {
367         int i, len, idx_flag = 0, loops = SNDRV_CARDS;
368         char *id, *spos;
369         
370         id = spos = card->shortname;    
371         while (*id != '\0') {
372                 if (*id == ' ')
373                         spos = id + 1;
374                 id++;
375         }
376         id = card->id;
377         while (*spos != '\0' && !isalnum(*spos))
378                 spos++;
379         if (isdigit(*spos))
380                 *id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D';
381         while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) {
382                 if (isalnum(*spos))
383                         *id++ = *spos;
384                 spos++;
385         }
386         *id = '\0';
387
388         id = card->id;
389         
390         if (*id == '\0')
391                 strcpy(id, "default");
392
393         while (1) {
394                 if (loops-- == 0) {
395                         snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id);
396                         strcpy(card->id, card->proc_root->name);
397                         return;
398                 }
399                 if (!snd_info_check_reserved_words(id))
400                         goto __change;
401                 for (i = 0; i < snd_ecards_limit; i++) {
402                         if (snd_cards[i] && !strcmp(snd_cards[i]->id, id))
403                                 goto __change;
404                 }
405                 break;
406
407               __change:
408                 len = strlen(id);
409                 if (idx_flag) {
410                         if (id[len-1] != '9')
411                                 id[len-1]++;
412                         else
413                                 id[len-1] = 'A';
414                 } else if ((size_t)len <= sizeof(card->id) - 3) {
415                         strcat(id, "_1");
416                         idx_flag++;
417                 } else {
418                         spos = id + len - 2;
419                         if ((size_t)len <= sizeof(card->id) - 2)
420                                 spos++;
421                         *spos++ = '_';
422                         *spos++ = '1';
423                         *spos++ = '\0';
424                         idx_flag++;
425                 }
426         }
427 }
428
429 /**
430  *  snd_card_register - register the soundcard
431  *  @card: soundcard structure
432  *
433  *  This function registers all the devices assigned to the soundcard.
434  *  Until calling this, the ALSA control interface is blocked from the
435  *  external accesses.  Thus, you should call this function at the end
436  *  of the initialization of the card.
437  *
438  *  Returns zero otherwise a negative error code if the registrain failed.
439  */
440 int snd_card_register(struct snd_card *card)
441 {
442         int err;
443
444         snd_assert(card != NULL, return -EINVAL);
445         if ((err = snd_device_register_all(card)) < 0)
446                 return err;
447         write_lock(&snd_card_rwlock);
448         if (snd_cards[card->number]) {
449                 /* already registered */
450                 write_unlock(&snd_card_rwlock);
451                 return 0;
452         }
453         if (card->id[0] == '\0')
454                 choose_default_id(card);
455         snd_cards[card->number] = card;
456         write_unlock(&snd_card_rwlock);
457         init_info_for_card(card);
458 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
459         if (snd_mixer_oss_notify_callback)
460                 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER);
461 #endif
462         return 0;
463 }
464
465 #ifdef CONFIG_PROC_FS
466 static struct snd_info_entry *snd_card_info_entry = NULL;
467
468 static void snd_card_info_read(struct snd_info_entry *entry,
469                                struct snd_info_buffer *buffer)
470 {
471         int idx, count;
472         struct snd_card *card;
473
474         for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
475                 read_lock(&snd_card_rwlock);
476                 if ((card = snd_cards[idx]) != NULL) {
477                         count++;
478                         snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n",
479                                         idx,
480                                         card->id,
481                                         card->driver,
482                                         card->shortname);
483                         snd_iprintf(buffer, "                      %s\n",
484                                         card->longname);
485                 }
486                 read_unlock(&snd_card_rwlock);
487         }
488         if (!count)
489                 snd_iprintf(buffer, "--- no soundcards ---\n");
490 }
491
492 #ifdef CONFIG_SND_OSSEMUL
493
494 void snd_card_info_read_oss(struct snd_info_buffer *buffer)
495 {
496         int idx, count;
497         struct snd_card *card;
498
499         for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
500                 read_lock(&snd_card_rwlock);
501                 if ((card = snd_cards[idx]) != NULL) {
502                         count++;
503                         snd_iprintf(buffer, "%s\n", card->longname);
504                 }
505                 read_unlock(&snd_card_rwlock);
506         }
507         if (!count) {
508                 snd_iprintf(buffer, "--- no soundcards ---\n");
509         }
510 }
511
512 #endif
513
514 #ifdef MODULE
515 static struct snd_info_entry *snd_card_module_info_entry;
516 static void snd_card_module_info_read(struct snd_info_entry *entry,
517                                       struct snd_info_buffer *buffer)
518 {
519         int idx;
520         struct snd_card *card;
521
522         for (idx = 0; idx < SNDRV_CARDS; idx++) {
523                 read_lock(&snd_card_rwlock);
524                 if ((card = snd_cards[idx]) != NULL)
525                         snd_iprintf(buffer, "%2i %s\n",
526                                     idx, card->module->name);
527                 read_unlock(&snd_card_rwlock);
528         }
529 }
530 #endif
531
532 int __init snd_card_info_init(void)
533 {
534         struct snd_info_entry *entry;
535
536         entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL);
537         if (! entry)
538                 return -ENOMEM;
539         entry->c.text.read_size = PAGE_SIZE;
540         entry->c.text.read = snd_card_info_read;
541         if (snd_info_register(entry) < 0) {
542                 snd_info_free_entry(entry);
543                 return -ENOMEM;
544         }
545         snd_card_info_entry = entry;
546
547 #ifdef MODULE
548         entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL);
549         if (entry) {
550                 entry->c.text.read_size = PAGE_SIZE;
551                 entry->c.text.read = snd_card_module_info_read;
552                 if (snd_info_register(entry) < 0)
553                         snd_info_free_entry(entry);
554                 else
555                         snd_card_module_info_entry = entry;
556         }
557 #endif
558
559         return 0;
560 }
561
562 int __exit snd_card_info_done(void)
563 {
564         snd_info_unregister(snd_card_info_entry);
565 #ifdef MODULE
566         snd_info_unregister(snd_card_module_info_entry);
567 #endif
568         return 0;
569 }
570
571 #endif /* CONFIG_PROC_FS */
572
573 /**
574  *  snd_component_add - add a component string
575  *  @card: soundcard structure
576  *  @component: the component id string
577  *
578  *  This function adds the component id string to the supported list.
579  *  The component can be referred from the alsa-lib.
580  *
581  *  Returns zero otherwise a negative error code.
582  */
583   
584 int snd_component_add(struct snd_card *card, const char *component)
585 {
586         char *ptr;
587         int len = strlen(component);
588
589         ptr = strstr(card->components, component);
590         if (ptr != NULL) {
591                 if (ptr[len] == '\0' || ptr[len] == ' ')        /* already there */
592                         return 1;
593         }
594         if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) {
595                 snd_BUG();
596                 return -ENOMEM;
597         }
598         if (card->components[0] != '\0')
599                 strcat(card->components, " ");
600         strcat(card->components, component);
601         return 0;
602 }
603
604 /**
605  *  snd_card_file_add - add the file to the file list of the card
606  *  @card: soundcard structure
607  *  @file: file pointer
608  *
609  *  This function adds the file to the file linked-list of the card.
610  *  This linked-list is used to keep tracking the connection state,
611  *  and to avoid the release of busy resources by hotplug.
612  *
613  *  Returns zero or a negative error code.
614  */
615 int snd_card_file_add(struct snd_card *card, struct file *file)
616 {
617         struct snd_monitor_file *mfile;
618
619         mfile = kmalloc(sizeof(*mfile), GFP_KERNEL);
620         if (mfile == NULL)
621                 return -ENOMEM;
622         mfile->file = file;
623         mfile->next = NULL;
624         spin_lock(&card->files_lock);
625         if (card->shutdown) {
626                 spin_unlock(&card->files_lock);
627                 kfree(mfile);
628                 return -ENODEV;
629         }
630         mfile->next = card->files;
631         card->files = mfile;
632         spin_unlock(&card->files_lock);
633         return 0;
634 }
635
636 /**
637  *  snd_card_file_remove - remove the file from the file list
638  *  @card: soundcard structure
639  *  @file: file pointer
640  *
641  *  This function removes the file formerly added to the card via
642  *  snd_card_file_add() function.
643  *  If all files are removed and the release of the card is
644  *  scheduled, it will wake up the the thread to call snd_card_free()
645  *  (see snd_card_free_in_thread() function).
646  *
647  *  Returns zero or a negative error code.
648  */
649 int snd_card_file_remove(struct snd_card *card, struct file *file)
650 {
651         struct snd_monitor_file *mfile, *pfile = NULL;
652
653         spin_lock(&card->files_lock);
654         mfile = card->files;
655         while (mfile) {
656                 if (mfile->file == file) {
657                         if (pfile)
658                                 pfile->next = mfile->next;
659                         else
660                                 card->files = mfile->next;
661                         break;
662                 }
663                 pfile = mfile;
664                 mfile = mfile->next;
665         }
666         spin_unlock(&card->files_lock);
667         if (card->files == NULL)
668                 wake_up(&card->shutdown_sleep);
669         if (!mfile) {
670                 snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file);
671                 return -ENOENT;
672         }
673         kfree(mfile);
674         return 0;
675 }
676
677 #ifdef CONFIG_PM
678 /**
679  *  snd_power_wait - wait until the power-state is changed.
680  *  @card: soundcard structure
681  *  @power_state: expected power state
682  *  @file: file structure for the O_NONBLOCK check (optional)
683  *
684  *  Waits until the power-state is changed.
685  *
686  *  Note: the power lock must be active before call.
687  */
688 int snd_power_wait(struct snd_card *card, unsigned int power_state, struct file *file)
689 {
690         wait_queue_t wait;
691         int result = 0;
692
693         /* fastpath */
694         if (snd_power_get_state(card) == power_state)
695                 return 0;
696         init_waitqueue_entry(&wait, current);
697         add_wait_queue(&card->power_sleep, &wait);
698         while (1) {
699                 if (card->shutdown) {
700                         result = -ENODEV;
701                         break;
702                 }
703                 if (snd_power_get_state(card) == power_state)
704                         break;
705 #if 0 /* block all devices */
706                 if (file && (file->f_flags & O_NONBLOCK)) {
707                         result = -EAGAIN;
708                         break;
709                 }
710 #endif
711                 set_current_state(TASK_UNINTERRUPTIBLE);
712                 snd_power_unlock(card);
713                 schedule_timeout(30 * HZ);
714                 snd_power_lock(card);
715         }
716         remove_wait_queue(&card->power_sleep, &wait);
717         return result;
718 }
719
720 #endif /* CONFIG_PM */