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