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22#include <linux/init.h>
23#include <linux/sched.h>
24#include <linux/module.h>
25#include <linux/device.h>
26#include <linux/file.h>
27#include <linux/slab.h>
28#include <linux/time.h>
29#include <linux/ctype.h>
30#include <linux/pm.h>
31
32#include <sound/core.h>
33#include <sound/control.h>
34#include <sound/info.h>
35
36
37struct snd_monitor_file {
38 struct file *file;
39 const struct file_operations *disconnected_f_op;
40 struct list_head shutdown_list;
41 struct list_head list;
42};
43
44static DEFINE_SPINLOCK(shutdown_lock);
45static LIST_HEAD(shutdown_files);
46
47static const struct file_operations snd_shutdown_f_ops;
48
49static unsigned int snd_cards_lock;
50struct snd_card *snd_cards[SNDRV_CARDS];
51EXPORT_SYMBOL(snd_cards);
52
53static DEFINE_MUTEX(snd_card_mutex);
54
55static char *slots[SNDRV_CARDS];
56module_param_array(slots, charp, NULL, 0444);
57MODULE_PARM_DESC(slots, "Module names assigned to the slots.");
58
59
60
61
62static int module_slot_match(struct module *module, int idx)
63{
64 int match = 1;
65#ifdef MODULE
66 const char *s1, *s2;
67
68 if (!module || !module->name || !slots[idx])
69 return 0;
70
71 s1 = module->name;
72 s2 = slots[idx];
73 if (*s2 == '!') {
74 match = 0;
75 s2++;
76 }
77
78
79
80 for (;;) {
81 char c1 = *s1++;
82 char c2 = *s2++;
83 if (c1 == '-')
84 c1 = '_';
85 if (c2 == '-')
86 c2 = '_';
87 if (c1 != c2)
88 return !match;
89 if (!c1)
90 break;
91 }
92#endif
93 return match;
94}
95
96#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
97int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag);
98EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
99#endif
100
101#ifdef CONFIG_PROC_FS
102static void snd_card_id_read(struct snd_info_entry *entry,
103 struct snd_info_buffer *buffer)
104{
105 snd_iprintf(buffer, "%s\n", entry->card->id);
106}
107
108static inline int init_info_for_card(struct snd_card *card)
109{
110 int err;
111 struct snd_info_entry *entry;
112
113 if ((err = snd_info_card_register(card)) < 0) {
114 snd_printd("unable to create card info\n");
115 return err;
116 }
117 if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) {
118 snd_printd("unable to create card entry\n");
119 return err;
120 }
121 entry->c.text.read = snd_card_id_read;
122 if (snd_info_register(entry) < 0) {
123 snd_info_free_entry(entry);
124 entry = NULL;
125 }
126 card->proc_id = entry;
127 return 0;
128}
129#else
130#define init_info_for_card(card)
131#endif
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149int snd_card_create(int idx, const char *xid,
150 struct module *module, int extra_size,
151 struct snd_card **card_ret)
152{
153 struct snd_card *card;
154 int err, idx2;
155
156 if (snd_BUG_ON(!card_ret))
157 return -EINVAL;
158 *card_ret = NULL;
159
160 if (extra_size < 0)
161 extra_size = 0;
162 card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL);
163 if (!card)
164 return -ENOMEM;
165 if (xid)
166 strlcpy(card->id, xid, sizeof(card->id));
167 err = 0;
168 mutex_lock(&snd_card_mutex);
169 if (idx < 0) {
170 for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++)
171
172 if (~snd_cards_lock & idx & 1<<idx2) {
173 if (module_slot_match(module, idx2)) {
174 idx = idx2;
175 break;
176 }
177 }
178 }
179 if (idx < 0) {
180 for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++)
181
182 if (~snd_cards_lock & idx & 1<<idx2) {
183 if (!slots[idx2] || !*slots[idx2]) {
184 idx = idx2;
185 break;
186 }
187 }
188 }
189 if (idx < 0)
190 err = -ENODEV;
191 else if (idx < snd_ecards_limit) {
192 if (snd_cards_lock & (1 << idx))
193 err = -EBUSY;
194 } else if (idx >= SNDRV_CARDS)
195 err = -ENODEV;
196 if (err < 0) {
197 mutex_unlock(&snd_card_mutex);
198 snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n",
199 idx, snd_ecards_limit - 1, err);
200 goto __error;
201 }
202 snd_cards_lock |= 1 << idx;
203 if (idx >= snd_ecards_limit)
204 snd_ecards_limit = idx + 1;
205 mutex_unlock(&snd_card_mutex);
206 card->number = idx;
207 card->module = module;
208 INIT_LIST_HEAD(&card->devices);
209 init_rwsem(&card->controls_rwsem);
210 rwlock_init(&card->ctl_files_rwlock);
211 INIT_LIST_HEAD(&card->controls);
212 INIT_LIST_HEAD(&card->ctl_files);
213 spin_lock_init(&card->files_lock);
214 INIT_LIST_HEAD(&card->files_list);
215 init_waitqueue_head(&card->shutdown_sleep);
216 atomic_set(&card->refcount, 0);
217#ifdef CONFIG_PM
218 mutex_init(&card->power_lock);
219 init_waitqueue_head(&card->power_sleep);
220#endif
221
222
223 err = snd_ctl_create(card);
224 if (err < 0) {
225 snd_printk(KERN_ERR "unable to register control minors\n");
226 goto __error;
227 }
228 err = snd_info_card_create(card);
229 if (err < 0) {
230 snd_printk(KERN_ERR "unable to create card info\n");
231 goto __error_ctl;
232 }
233 if (extra_size > 0)
234 card->private_data = (char *)card + sizeof(struct snd_card);
235 *card_ret = card;
236 return 0;
237
238 __error_ctl:
239 snd_device_free_all(card, SNDRV_DEV_CMD_PRE);
240 __error:
241 kfree(card);
242 return err;
243}
244EXPORT_SYMBOL(snd_card_create);
245
246
247int snd_card_locked(int card)
248{
249 int locked;
250
251 mutex_lock(&snd_card_mutex);
252 locked = snd_cards_lock & (1 << card);
253 mutex_unlock(&snd_card_mutex);
254 return locked;
255}
256
257static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig)
258{
259 return -ENODEV;
260}
261
262static ssize_t snd_disconnect_read(struct file *file, char __user *buf,
263 size_t count, loff_t *offset)
264{
265 return -ENODEV;
266}
267
268static ssize_t snd_disconnect_write(struct file *file, const char __user *buf,
269 size_t count, loff_t *offset)
270{
271 return -ENODEV;
272}
273
274static int snd_disconnect_release(struct inode *inode, struct file *file)
275{
276 struct snd_monitor_file *df = NULL, *_df;
277
278 spin_lock(&shutdown_lock);
279 list_for_each_entry(_df, &shutdown_files, shutdown_list) {
280 if (_df->file == file) {
281 df = _df;
282 list_del_init(&df->shutdown_list);
283 break;
284 }
285 }
286 spin_unlock(&shutdown_lock);
287
288 if (likely(df)) {
289 if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync)
290 df->disconnected_f_op->fasync(-1, file, 0);
291 return df->disconnected_f_op->release(inode, file);
292 }
293
294 panic("%s(%p, %p) failed!", __func__, inode, file);
295}
296
297static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait)
298{
299 return POLLERR | POLLNVAL;
300}
301
302static long snd_disconnect_ioctl(struct file *file,
303 unsigned int cmd, unsigned long arg)
304{
305 return -ENODEV;
306}
307
308static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma)
309{
310 return -ENODEV;
311}
312
313static int snd_disconnect_fasync(int fd, struct file *file, int on)
314{
315 return -ENODEV;
316}
317
318static const struct file_operations snd_shutdown_f_ops =
319{
320 .owner = THIS_MODULE,
321 .llseek = snd_disconnect_llseek,
322 .read = snd_disconnect_read,
323 .write = snd_disconnect_write,
324 .release = snd_disconnect_release,
325 .poll = snd_disconnect_poll,
326 .unlocked_ioctl = snd_disconnect_ioctl,
327#ifdef CONFIG_COMPAT
328 .compat_ioctl = snd_disconnect_ioctl,
329#endif
330 .mmap = snd_disconnect_mmap,
331 .fasync = snd_disconnect_fasync
332};
333
334
335
336
337
338
339
340
341
342
343
344
345int snd_card_disconnect(struct snd_card *card)
346{
347 struct snd_monitor_file *mfile;
348 int err;
349
350 if (!card)
351 return -EINVAL;
352
353 spin_lock(&card->files_lock);
354 if (card->shutdown) {
355 spin_unlock(&card->files_lock);
356 return 0;
357 }
358 card->shutdown = 1;
359 spin_unlock(&card->files_lock);
360
361
362 mutex_lock(&snd_card_mutex);
363 snd_cards[card->number] = NULL;
364 snd_cards_lock &= ~(1 << card->number);
365 mutex_unlock(&snd_card_mutex);
366
367
368
369 spin_lock(&card->files_lock);
370 list_for_each_entry(mfile, &card->files_list, list) {
371
372
373 mfile->disconnected_f_op = mfile->file->f_op;
374
375 spin_lock(&shutdown_lock);
376 list_add(&mfile->shutdown_list, &shutdown_files);
377 spin_unlock(&shutdown_lock);
378
379 mfile->file->f_op = &snd_shutdown_f_ops;
380 fops_get(mfile->file->f_op);
381 }
382 spin_unlock(&card->files_lock);
383
384
385
386
387#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
388 if (snd_mixer_oss_notify_callback)
389 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT);
390#endif
391
392
393 err = snd_device_disconnect_all(card);
394 if (err < 0)
395 snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number);
396
397 snd_info_card_disconnect(card);
398 if (card->card_dev) {
399 device_unregister(card->card_dev);
400 card->card_dev = NULL;
401 }
402#ifdef CONFIG_PM
403 wake_up(&card->power_sleep);
404#endif
405 return 0;
406}
407
408EXPORT_SYMBOL(snd_card_disconnect);
409
410
411
412
413
414
415
416
417
418
419
420
421static int snd_card_do_free(struct snd_card *card)
422{
423#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
424 if (snd_mixer_oss_notify_callback)
425 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE);
426#endif
427 if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) {
428 snd_printk(KERN_ERR "unable to free all devices (pre)\n");
429
430 }
431 if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) {
432 snd_printk(KERN_ERR "unable to free all devices (normal)\n");
433
434 }
435 if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) {
436 snd_printk(KERN_ERR "unable to free all devices (post)\n");
437
438 }
439 if (card->private_free)
440 card->private_free(card);
441 snd_info_free_entry(card->proc_id);
442 if (snd_info_card_free(card) < 0) {
443 snd_printk(KERN_WARNING "unable to free card info\n");
444
445 }
446 kfree(card);
447 return 0;
448}
449
450
451
452
453
454
455
456
457void snd_card_unref(struct snd_card *card)
458{
459 if (atomic_dec_and_test(&card->refcount)) {
460 wake_up(&card->shutdown_sleep);
461 if (card->free_on_last_close)
462 snd_card_do_free(card);
463 }
464}
465EXPORT_SYMBOL(snd_card_unref);
466
467int snd_card_free_when_closed(struct snd_card *card)
468{
469 int ret;
470
471 atomic_inc(&card->refcount);
472 ret = snd_card_disconnect(card);
473 if (ret) {
474 atomic_dec(&card->refcount);
475 return ret;
476 }
477
478 card->free_on_last_close = 1;
479 if (atomic_dec_and_test(&card->refcount))
480 snd_card_do_free(card);
481 return 0;
482}
483
484EXPORT_SYMBOL(snd_card_free_when_closed);
485
486int snd_card_free(struct snd_card *card)
487{
488 int ret = snd_card_disconnect(card);
489 if (ret)
490 return ret;
491
492
493 wait_event(card->shutdown_sleep, !atomic_read(&card->refcount));
494 snd_card_do_free(card);
495 return 0;
496}
497
498EXPORT_SYMBOL(snd_card_free);
499
500
501static const char *retrieve_id_from_card_name(const char *name)
502{
503 const char *spos = name;
504
505 while (*name) {
506 if (isspace(*name) && isalnum(name[1]))
507 spos = name + 1;
508 name++;
509 }
510 return spos;
511}
512
513
514static bool card_id_ok(struct snd_card *card, const char *id)
515{
516 int i;
517 if (!snd_info_check_reserved_words(id))
518 return false;
519 for (i = 0; i < snd_ecards_limit; i++) {
520 if (snd_cards[i] && snd_cards[i] != card &&
521 !strcmp(snd_cards[i]->id, id))
522 return false;
523 }
524 return true;
525}
526
527
528static void copy_valid_id_string(struct snd_card *card, const char *src,
529 const char *nid)
530{
531 char *id = card->id;
532
533 while (*nid && !isalnum(*nid))
534 nid++;
535 if (isdigit(*nid))
536 *id++ = isalpha(*src) ? *src : 'D';
537 while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) {
538 if (isalnum(*nid))
539 *id++ = *nid;
540 nid++;
541 }
542 *id = 0;
543}
544
545
546
547
548static void snd_card_set_id_no_lock(struct snd_card *card, const char *src,
549 const char *nid)
550{
551 int len, loops;
552 bool with_suffix;
553 bool is_default = false;
554 char *id;
555
556 copy_valid_id_string(card, src, nid);
557 id = card->id;
558
559 again:
560
561
562
563 if (!*id || !strncmp(id, "card", 4)) {
564 strcpy(id, "Default");
565 is_default = true;
566 }
567
568 with_suffix = false;
569 for (loops = 0; loops < SNDRV_CARDS; loops++) {
570 if (card_id_ok(card, id))
571 return;
572
573 len = strlen(id);
574 if (!with_suffix) {
575
576 char *spos = id + len;
577 if (len > sizeof(card->id) - 3)
578 spos = id + sizeof(card->id) - 3;
579 strcpy(spos, "_1");
580 with_suffix = true;
581 } else {
582
583 if (id[len - 1] != '9')
584 id[len - 1]++;
585 else
586 id[len - 1] = 'A';
587 }
588 }
589
590 if (!is_default) {
591 *id = 0;
592 goto again;
593 }
594
595 snd_printk(KERN_ERR "unable to set card id (%s)\n", id);
596 if (card->proc_root->name)
597 strcpy(card->id, card->proc_root->name);
598}
599
600
601
602
603
604
605
606
607
608void snd_card_set_id(struct snd_card *card, const char *nid)
609{
610
611 if (card->id[0] != '\0')
612 return;
613 mutex_lock(&snd_card_mutex);
614 snd_card_set_id_no_lock(card, nid, nid);
615 mutex_unlock(&snd_card_mutex);
616}
617EXPORT_SYMBOL(snd_card_set_id);
618
619static ssize_t
620card_id_show_attr(struct device *dev,
621 struct device_attribute *attr, char *buf)
622{
623 struct snd_card *card = dev_get_drvdata(dev);
624 return snprintf(buf, PAGE_SIZE, "%s\n", card ? card->id : "(null)");
625}
626
627static ssize_t
628card_id_store_attr(struct device *dev, struct device_attribute *attr,
629 const char *buf, size_t count)
630{
631 struct snd_card *card = dev_get_drvdata(dev);
632 char buf1[sizeof(card->id)];
633 size_t copy = count > sizeof(card->id) - 1 ?
634 sizeof(card->id) - 1 : count;
635 size_t idx;
636 int c;
637
638 for (idx = 0; idx < copy; idx++) {
639 c = buf[idx];
640 if (!isalnum(c) && c != '_' && c != '-')
641 return -EINVAL;
642 }
643 memcpy(buf1, buf, copy);
644 buf1[copy] = '\0';
645 mutex_lock(&snd_card_mutex);
646 if (!card_id_ok(NULL, buf1)) {
647 mutex_unlock(&snd_card_mutex);
648 return -EEXIST;
649 }
650 strcpy(card->id, buf1);
651 snd_info_card_id_change(card);
652 mutex_unlock(&snd_card_mutex);
653
654 return count;
655}
656
657static struct device_attribute card_id_attrs =
658 __ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr);
659
660static ssize_t
661card_number_show_attr(struct device *dev,
662 struct device_attribute *attr, char *buf)
663{
664 struct snd_card *card = dev_get_drvdata(dev);
665 return snprintf(buf, PAGE_SIZE, "%i\n", card ? card->number : -1);
666}
667
668static struct device_attribute card_number_attrs =
669 __ATTR(number, S_IRUGO, card_number_show_attr, NULL);
670
671
672
673
674
675
676
677
678
679
680
681
682int snd_card_register(struct snd_card *card)
683{
684 int err;
685
686 if (snd_BUG_ON(!card))
687 return -EINVAL;
688
689 if (!card->card_dev) {
690 card->card_dev = device_create(sound_class, card->dev,
691 MKDEV(0, 0), card,
692 "card%i", card->number);
693 if (IS_ERR(card->card_dev))
694 card->card_dev = NULL;
695 }
696
697 if ((err = snd_device_register_all(card)) < 0)
698 return err;
699 mutex_lock(&snd_card_mutex);
700 if (snd_cards[card->number]) {
701
702 mutex_unlock(&snd_card_mutex);
703 return 0;
704 }
705 if (*card->id) {
706
707 char tmpid[sizeof(card->id)];
708 memcpy(tmpid, card->id, sizeof(card->id));
709 snd_card_set_id_no_lock(card, tmpid, tmpid);
710 } else {
711
712 const char *src;
713 src = *card->shortname ? card->shortname : card->longname;
714 snd_card_set_id_no_lock(card, src,
715 retrieve_id_from_card_name(src));
716 }
717 snd_cards[card->number] = card;
718 mutex_unlock(&snd_card_mutex);
719 init_info_for_card(card);
720#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
721 if (snd_mixer_oss_notify_callback)
722 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER);
723#endif
724 if (card->card_dev) {
725 err = device_create_file(card->card_dev, &card_id_attrs);
726 if (err < 0)
727 return err;
728 err = device_create_file(card->card_dev, &card_number_attrs);
729 if (err < 0)
730 return err;
731 }
732
733 return 0;
734}
735
736EXPORT_SYMBOL(snd_card_register);
737
738#ifdef CONFIG_PROC_FS
739static struct snd_info_entry *snd_card_info_entry;
740
741static void snd_card_info_read(struct snd_info_entry *entry,
742 struct snd_info_buffer *buffer)
743{
744 int idx, count;
745 struct snd_card *card;
746
747 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
748 mutex_lock(&snd_card_mutex);
749 if ((card = snd_cards[idx]) != NULL) {
750 count++;
751 snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n",
752 idx,
753 card->id,
754 card->driver,
755 card->shortname);
756 snd_iprintf(buffer, " %s\n",
757 card->longname);
758 }
759 mutex_unlock(&snd_card_mutex);
760 }
761 if (!count)
762 snd_iprintf(buffer, "--- no soundcards ---\n");
763}
764
765#ifdef CONFIG_SND_OSSEMUL
766
767void snd_card_info_read_oss(struct snd_info_buffer *buffer)
768{
769 int idx, count;
770 struct snd_card *card;
771
772 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
773 mutex_lock(&snd_card_mutex);
774 if ((card = snd_cards[idx]) != NULL) {
775 count++;
776 snd_iprintf(buffer, "%s\n", card->longname);
777 }
778 mutex_unlock(&snd_card_mutex);
779 }
780 if (!count) {
781 snd_iprintf(buffer, "--- no soundcards ---\n");
782 }
783}
784
785#endif
786
787#ifdef MODULE
788static struct snd_info_entry *snd_card_module_info_entry;
789static void snd_card_module_info_read(struct snd_info_entry *entry,
790 struct snd_info_buffer *buffer)
791{
792 int idx;
793 struct snd_card *card;
794
795 for (idx = 0; idx < SNDRV_CARDS; idx++) {
796 mutex_lock(&snd_card_mutex);
797 if ((card = snd_cards[idx]) != NULL)
798 snd_iprintf(buffer, "%2i %s\n",
799 idx, card->module->name);
800 mutex_unlock(&snd_card_mutex);
801 }
802}
803#endif
804
805int __init snd_card_info_init(void)
806{
807 struct snd_info_entry *entry;
808
809 entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL);
810 if (! entry)
811 return -ENOMEM;
812 entry->c.text.read = snd_card_info_read;
813 if (snd_info_register(entry) < 0) {
814 snd_info_free_entry(entry);
815 return -ENOMEM;
816 }
817 snd_card_info_entry = entry;
818
819#ifdef MODULE
820 entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL);
821 if (entry) {
822 entry->c.text.read = snd_card_module_info_read;
823 if (snd_info_register(entry) < 0)
824 snd_info_free_entry(entry);
825 else
826 snd_card_module_info_entry = entry;
827 }
828#endif
829
830 return 0;
831}
832
833int __exit snd_card_info_done(void)
834{
835 snd_info_free_entry(snd_card_info_entry);
836#ifdef MODULE
837 snd_info_free_entry(snd_card_module_info_entry);
838#endif
839 return 0;
840}
841
842#endif
843
844
845
846
847
848
849
850
851
852
853
854
855int snd_component_add(struct snd_card *card, const char *component)
856{
857 char *ptr;
858 int len = strlen(component);
859
860 ptr = strstr(card->components, component);
861 if (ptr != NULL) {
862 if (ptr[len] == '\0' || ptr[len] == ' ')
863 return 1;
864 }
865 if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) {
866 snd_BUG();
867 return -ENOMEM;
868 }
869 if (card->components[0] != '\0')
870 strcat(card->components, " ");
871 strcat(card->components, component);
872 return 0;
873}
874
875EXPORT_SYMBOL(snd_component_add);
876
877
878
879
880
881
882
883
884
885
886
887
888int snd_card_file_add(struct snd_card *card, struct file *file)
889{
890 struct snd_monitor_file *mfile;
891
892 mfile = kmalloc(sizeof(*mfile), GFP_KERNEL);
893 if (mfile == NULL)
894 return -ENOMEM;
895 mfile->file = file;
896 mfile->disconnected_f_op = NULL;
897 INIT_LIST_HEAD(&mfile->shutdown_list);
898 spin_lock(&card->files_lock);
899 if (card->shutdown) {
900 spin_unlock(&card->files_lock);
901 kfree(mfile);
902 return -ENODEV;
903 }
904 list_add(&mfile->list, &card->files_list);
905 atomic_inc(&card->refcount);
906 spin_unlock(&card->files_lock);
907 return 0;
908}
909
910EXPORT_SYMBOL(snd_card_file_add);
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925int snd_card_file_remove(struct snd_card *card, struct file *file)
926{
927 struct snd_monitor_file *mfile, *found = NULL;
928
929 spin_lock(&card->files_lock);
930 list_for_each_entry(mfile, &card->files_list, list) {
931 if (mfile->file == file) {
932 list_del(&mfile->list);
933 spin_lock(&shutdown_lock);
934 list_del(&mfile->shutdown_list);
935 spin_unlock(&shutdown_lock);
936 if (mfile->disconnected_f_op)
937 fops_put(mfile->disconnected_f_op);
938 found = mfile;
939 break;
940 }
941 }
942 spin_unlock(&card->files_lock);
943 if (!found) {
944 snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file);
945 return -ENOENT;
946 }
947 kfree(found);
948 snd_card_unref(card);
949 return 0;
950}
951
952EXPORT_SYMBOL(snd_card_file_remove);
953
954#ifdef CONFIG_PM
955
956
957
958
959
960
961
962
963
964int snd_power_wait(struct snd_card *card, unsigned int power_state)
965{
966 wait_queue_t wait;
967 int result = 0;
968
969
970 if (snd_power_get_state(card) == power_state)
971 return 0;
972 init_waitqueue_entry(&wait, current);
973 add_wait_queue(&card->power_sleep, &wait);
974 while (1) {
975 if (card->shutdown) {
976 result = -ENODEV;
977 break;
978 }
979 if (snd_power_get_state(card) == power_state)
980 break;
981 set_current_state(TASK_UNINTERRUPTIBLE);
982 snd_power_unlock(card);
983 schedule_timeout(30 * HZ);
984 snd_power_lock(card);
985 }
986 remove_wait_queue(&card->power_sleep, &wait);
987 return result;
988}
989
990EXPORT_SYMBOL(snd_power_wait);
991#endif
992