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Linux 4.15.6
[linux/fpc-iii.git] / sound / core / info.c
blobbcf6a48cc70d3b82d78b1b7a944e1bd4e0b1dd5d
1 /*
2 * Information interface for ALSA driver
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/time.h>
24 #include <linux/mm.h>
25 #include <linux/slab.h>
26 #include <linux/string.h>
27 #include <linux/module.h>
28 #include <sound/core.h>
29 #include <sound/minors.h>
30 #include <sound/info.h>
31 #include <linux/utsname.h>
32 #include <linux/proc_fs.h>
33 #include <linux/mutex.h>
34 #include <stdarg.h>
35
36 int snd_info_check_reserved_words(const char *str)
37 {
38 static char *reserved[] =
39 {
40 "version",
41 "meminfo",
42 "memdebug",
43 "detect",
44 "devices",
45 "oss",
46 "cards",
47 "timers",
48 "synth",
49 "pcm",
50 "seq",
51 NULL
52 };
53 char **xstr = reserved;
54
55 while (*xstr) {
56 if (!strcmp(*xstr, str))
57 return 0;
58 xstr++;
59 }
60 if (!strncmp(str, "card", 4))
61 return 0;
62 return 1;
63 }
64
65 static DEFINE_MUTEX(info_mutex);
66
67 struct snd_info_private_data {
68 struct snd_info_buffer *rbuffer;
69 struct snd_info_buffer *wbuffer;
70 struct snd_info_entry *entry;
71 void *file_private_data;
72 };
73
74 static int snd_info_version_init(void);
75 static void snd_info_disconnect(struct snd_info_entry *entry);
76
77 /*
78
79 */
80
81 static struct snd_info_entry *snd_proc_root;
82 struct snd_info_entry *snd_seq_root;
83 EXPORT_SYMBOL(snd_seq_root);
84
85 #ifdef CONFIG_SND_OSSEMUL
86 struct snd_info_entry *snd_oss_root;
87 #endif
88
89 static int alloc_info_private(struct snd_info_entry *entry,
90 struct snd_info_private_data **ret)
91 {
92 struct snd_info_private_data *data;
93
94 if (!entry || !entry->p)
95 return -ENODEV;
96 if (!try_module_get(entry->module))
97 return -EFAULT;
98 data = kzalloc(sizeof(*data), GFP_KERNEL);
99 if (!data) {
100 module_put(entry->module);
101 return -ENOMEM;
102 }
103 data->entry = entry;
104 *ret = data;
105 return 0;
106 }
107
108 static bool valid_pos(loff_t pos, size_t count)
109 {
110 if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
111 return false;
112 if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
113 return false;
114 return true;
115 }
116
117 /*
118 * file ops for binary proc files
119 */
120 static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
121 {
122 struct snd_info_private_data *data;
123 struct snd_info_entry *entry;
124 loff_t ret = -EINVAL, size;
125
126 data = file->private_data;
127 entry = data->entry;
128 mutex_lock(&entry->access);
129 if (entry->c.ops->llseek) {
130 offset = entry->c.ops->llseek(entry,
131 data->file_private_data,
132 file, offset, orig);
133 goto out;
134 }
135
136 size = entry->size;
137 switch (orig) {
138 case SEEK_SET:
139 break;
140 case SEEK_CUR:
141 offset += file->f_pos;
142 break;
143 case SEEK_END:
144 if (!size)
145 goto out;
146 offset += size;
147 break;
148 default:
149 goto out;
150 }
151 if (offset < 0)
152 goto out;
153 if (size && offset > size)
154 offset = size;
155 file->f_pos = offset;
156 ret = offset;
157 out:
158 mutex_unlock(&entry->access);
159 return ret;
160 }
161
162 static ssize_t snd_info_entry_read(struct file *file, char __user *buffer,
163 size_t count, loff_t * offset)
164 {
165 struct snd_info_private_data *data = file->private_data;
166 struct snd_info_entry *entry = data->entry;
167 size_t size;
168 loff_t pos;
169
170 pos = *offset;
171 if (!valid_pos(pos, count))
172 return -EIO;
173 if (pos >= entry->size)
174 return 0;
175 size = entry->size - pos;
176 size = min(count, size);
177 size = entry->c.ops->read(entry, data->file_private_data,
178 file, buffer, size, pos);
179 if ((ssize_t) size > 0)
180 *offset = pos + size;
181 return size;
182 }
183
184 static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer,
185 size_t count, loff_t * offset)
186 {
187 struct snd_info_private_data *data = file->private_data;
188 struct snd_info_entry *entry = data->entry;
189 ssize_t size = 0;
190 loff_t pos;
191
192 pos = *offset;
193 if (!valid_pos(pos, count))
194 return -EIO;
195 if (count > 0) {
196 size_t maxsize = entry->size - pos;
197 count = min(count, maxsize);
198 size = entry->c.ops->write(entry, data->file_private_data,
199 file, buffer, count, pos);
200 }
201 if (size > 0)
202 *offset = pos + size;
203 return size;
204 }
205
206 static unsigned int snd_info_entry_poll(struct file *file, poll_table *wait)
207 {
208 struct snd_info_private_data *data = file->private_data;
209 struct snd_info_entry *entry = data->entry;
210 unsigned int mask = 0;
211
212 if (entry->c.ops->poll)
213 return entry->c.ops->poll(entry,
214 data->file_private_data,
215 file, wait);
216 if (entry->c.ops->read)
217 mask |= POLLIN | POLLRDNORM;
218 if (entry->c.ops->write)
219 mask |= POLLOUT | POLLWRNORM;
220 return mask;
221 }
222
223 static long snd_info_entry_ioctl(struct file *file, unsigned int cmd,
224 unsigned long arg)
225 {
226 struct snd_info_private_data *data = file->private_data;
227 struct snd_info_entry *entry = data->entry;
228
229 if (!entry->c.ops->ioctl)
230 return -ENOTTY;
231 return entry->c.ops->ioctl(entry, data->file_private_data,
232 file, cmd, arg);
233 }
234
235 static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma)
236 {
237 struct inode *inode = file_inode(file);
238 struct snd_info_private_data *data;
239 struct snd_info_entry *entry;
240
241 data = file->private_data;
242 if (data == NULL)
243 return 0;
244 entry = data->entry;
245 if (!entry->c.ops->mmap)
246 return -ENXIO;
247 return entry->c.ops->mmap(entry, data->file_private_data,
248 inode, file, vma);
249 }
250
251 static int snd_info_entry_open(struct inode *inode, struct file *file)
252 {
253 struct snd_info_entry *entry = PDE_DATA(inode);
254 struct snd_info_private_data *data;
255 int mode, err;
256
257 mutex_lock(&info_mutex);
258 err = alloc_info_private(entry, &data);
259 if (err < 0)
260 goto unlock;
261
262 mode = file->f_flags & O_ACCMODE;
263 if (((mode == O_RDONLY || mode == O_RDWR) && !entry->c.ops->read) ||
264 ((mode == O_WRONLY || mode == O_RDWR) && !entry->c.ops->write)) {
265 err = -ENODEV;
266 goto error;
267 }
268
269 if (entry->c.ops->open) {
270 err = entry->c.ops->open(entry, mode, &data->file_private_data);
271 if (err < 0)
272 goto error;
273 }
274
275 file->private_data = data;
276 mutex_unlock(&info_mutex);
277 return 0;
278
279 error:
280 kfree(data);
281 module_put(entry->module);
282 unlock:
283 mutex_unlock(&info_mutex);
284 return err;
285 }
286
287 static int snd_info_entry_release(struct inode *inode, struct file *file)
288 {
289 struct snd_info_private_data *data = file->private_data;
290 struct snd_info_entry *entry = data->entry;
291
292 if (entry->c.ops->release)
293 entry->c.ops->release(entry, file->f_flags & O_ACCMODE,
294 data->file_private_data);
295 module_put(entry->module);
296 kfree(data);
297 return 0;
298 }
299
300 static const struct file_operations snd_info_entry_operations =
301 {
302 .owner = THIS_MODULE,
303 .llseek = snd_info_entry_llseek,
304 .read = snd_info_entry_read,
305 .write = snd_info_entry_write,
306 .poll = snd_info_entry_poll,
307 .unlocked_ioctl = snd_info_entry_ioctl,
308 .mmap = snd_info_entry_mmap,
309 .open = snd_info_entry_open,
310 .release = snd_info_entry_release,
311 };
312
313 /*
314 * file ops for text proc files
315 */
316 static ssize_t snd_info_text_entry_write(struct file *file,
317 const char __user *buffer,
318 size_t count, loff_t *offset)
319 {
320 struct seq_file *m = file->private_data;
321 struct snd_info_private_data *data = m->private;
322 struct snd_info_entry *entry = data->entry;
323 struct snd_info_buffer *buf;
324 loff_t pos;
325 size_t next;
326 int err = 0;
327
328 if (!entry->c.text.write)
329 return -EIO;
330 pos = *offset;
331 if (!valid_pos(pos, count))
332 return -EIO;
333 next = pos + count;
334 /* don't handle too large text inputs */
335 if (next > 16 * 1024)
336 return -EIO;
337 mutex_lock(&entry->access);
338 buf = data->wbuffer;
339 if (!buf) {
340 data->wbuffer = buf = kzalloc(sizeof(*buf), GFP_KERNEL);
341 if (!buf) {
342 err = -ENOMEM;
343 goto error;
344 }
345 }
346 if (next > buf->len) {
347 char *nbuf = kvzalloc(PAGE_ALIGN(next), GFP_KERNEL);
348 if (!nbuf) {
349 err = -ENOMEM;
350 goto error;
351 }
352 kvfree(buf->buffer);
353 buf->buffer = nbuf;
354 buf->len = PAGE_ALIGN(next);
355 }
356 if (copy_from_user(buf->buffer + pos, buffer, count)) {
357 err = -EFAULT;
358 goto error;
359 }
360 buf->size = next;
361 error:
362 mutex_unlock(&entry->access);
363 if (err < 0)
364 return err;
365 *offset = next;
366 return count;
367 }
368
369 static int snd_info_seq_show(struct seq_file *seq, void *p)
370 {
371 struct snd_info_private_data *data = seq->private;
372 struct snd_info_entry *entry = data->entry;
373
374 if (!entry->c.text.read) {
375 return -EIO;
376 } else {
377 data->rbuffer->buffer = (char *)seq; /* XXX hack! */
378 entry->c.text.read(entry, data->rbuffer);
379 }
380 return 0;
381 }
382
383 static int snd_info_text_entry_open(struct inode *inode, struct file *file)
384 {
385 struct snd_info_entry *entry = PDE_DATA(inode);
386 struct snd_info_private_data *data;
387 int err;
388
389 mutex_lock(&info_mutex);
390 err = alloc_info_private(entry, &data);
391 if (err < 0)
392 goto unlock;
393
394 data->rbuffer = kzalloc(sizeof(*data->rbuffer), GFP_KERNEL);
395 if (!data->rbuffer) {
396 err = -ENOMEM;
397 goto error;
398 }
399 if (entry->size)
400 err = single_open_size(file, snd_info_seq_show, data,
401 entry->size);
402 else
403 err = single_open(file, snd_info_seq_show, data);
404 if (err < 0)
405 goto error;
406 mutex_unlock(&info_mutex);
407 return 0;
408
409 error:
410 kfree(data->rbuffer);
411 kfree(data);
412 module_put(entry->module);
413 unlock:
414 mutex_unlock(&info_mutex);
415 return err;
416 }
417
418 static int snd_info_text_entry_release(struct inode *inode, struct file *file)
419 {
420 struct seq_file *m = file->private_data;
421 struct snd_info_private_data *data = m->private;
422 struct snd_info_entry *entry = data->entry;
423
424 if (data->wbuffer && entry->c.text.write)
425 entry->c.text.write(entry, data->wbuffer);
426
427 single_release(inode, file);
428 kfree(data->rbuffer);
429 if (data->wbuffer) {
430 kvfree(data->wbuffer->buffer);
431 kfree(data->wbuffer);
432 }
433
434 module_put(entry->module);
435 kfree(data);
436 return 0;
437 }
438
439 static const struct file_operations snd_info_text_entry_ops =
440 {
441 .owner = THIS_MODULE,
442 .open = snd_info_text_entry_open,
443 .release = snd_info_text_entry_release,
444 .write = snd_info_text_entry_write,
445 .llseek = seq_lseek,
446 .read = seq_read,
447 };
448
449 static struct snd_info_entry *create_subdir(struct module *mod,
450 const char *name)
451 {
452 struct snd_info_entry *entry;
453
454 entry = snd_info_create_module_entry(mod, name, NULL);
455 if (!entry)
456 return NULL;
457 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
458 if (snd_info_register(entry) < 0) {
459 snd_info_free_entry(entry);
460 return NULL;
461 }
462 return entry;
463 }
464
465 static struct snd_info_entry *
466 snd_info_create_entry(const char *name, struct snd_info_entry *parent);
467
468 int __init snd_info_init(void)
469 {
470 snd_proc_root = snd_info_create_entry("asound", NULL);
471 if (!snd_proc_root)
472 return -ENOMEM;
473 snd_proc_root->mode = S_IFDIR | S_IRUGO | S_IXUGO;
474 snd_proc_root->p = proc_mkdir("asound", NULL);
475 if (!snd_proc_root->p)
476 goto error;
477 #ifdef CONFIG_SND_OSSEMUL
478 snd_oss_root = create_subdir(THIS_MODULE, "oss");
479 if (!snd_oss_root)
480 goto error;
481 #endif
482 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
483 snd_seq_root = create_subdir(THIS_MODULE, "seq");
484 if (!snd_seq_root)
485 goto error;
486 #endif
487 if (snd_info_version_init() < 0 ||
488 snd_minor_info_init() < 0 ||
489 snd_minor_info_oss_init() < 0 ||
490 snd_card_info_init() < 0 ||
491 snd_info_minor_register() < 0)
492 goto error;
493 return 0;
494
495 error:
496 snd_info_free_entry(snd_proc_root);
497 return -ENOMEM;
498 }
499
500 int __exit snd_info_done(void)
501 {
502 snd_info_free_entry(snd_proc_root);
503 return 0;
504 }
505
506 /*
507 * create a card proc file
508 * called from init.c
509 */
510 int snd_info_card_create(struct snd_card *card)
511 {
512 char str[8];
513 struct snd_info_entry *entry;
514
515 if (snd_BUG_ON(!card))
516 return -ENXIO;
517
518 sprintf(str, "card%i", card->number);
519 entry = create_subdir(card->module, str);
520 if (!entry)
521 return -ENOMEM;
522 card->proc_root = entry;
523 return 0;
524 }
525
526 /* register all pending info entries */
527 static int snd_info_register_recursive(struct snd_info_entry *entry)
528 {
529 struct snd_info_entry *p;
530 int err;
531
532 if (!entry->p) {
533 err = snd_info_register(entry);
534 if (err < 0)
535 return err;
536 }
537
538 list_for_each_entry(p, &entry->children, list) {
539 err = snd_info_register_recursive(p);
540 if (err < 0)
541 return err;
542 }
543
544 return 0;
545 }
546
547 /*
548 * register the card proc file
549 * called from init.c
550 * can be called multiple times for reinitialization
551 */
552 int snd_info_card_register(struct snd_card *card)
553 {
554 struct proc_dir_entry *p;
555 int err;
556
557 if (snd_BUG_ON(!card))
558 return -ENXIO;
559
560 err = snd_info_register_recursive(card->proc_root);
561 if (err < 0)
562 return err;
563
564 if (!strcmp(card->id, card->proc_root->name))
565 return 0;
566
567 if (card->proc_root_link)
568 return 0;
569 p = proc_symlink(card->id, snd_proc_root->p, card->proc_root->name);
570 if (!p)
571 return -ENOMEM;
572 card->proc_root_link = p;
573 return 0;
574 }
575
576 /*
577 * called on card->id change
578 */
579 void snd_info_card_id_change(struct snd_card *card)
580 {
581 mutex_lock(&info_mutex);
582 if (card->proc_root_link) {
583 proc_remove(card->proc_root_link);
584 card->proc_root_link = NULL;
585 }
586 if (strcmp(card->id, card->proc_root->name))
587 card->proc_root_link = proc_symlink(card->id,
588 snd_proc_root->p,
589 card->proc_root->name);
590 mutex_unlock(&info_mutex);
591 }
592
593 /*
594 * de-register the card proc file
595 * called from init.c
596 */
597 void snd_info_card_disconnect(struct snd_card *card)
598 {
599 if (!card)
600 return;
601 mutex_lock(&info_mutex);
602 proc_remove(card->proc_root_link);
603 card->proc_root_link = NULL;
604 if (card->proc_root)
605 snd_info_disconnect(card->proc_root);
606 mutex_unlock(&info_mutex);
607 }
608
609 /*
610 * release the card proc file resources
611 * called from init.c
612 */
613 int snd_info_card_free(struct snd_card *card)
614 {
615 if (!card)
616 return 0;
617 snd_info_free_entry(card->proc_root);
618 card->proc_root = NULL;
619 return 0;
620 }
621
622
623 /**
624 * snd_info_get_line - read one line from the procfs buffer
625 * @buffer: the procfs buffer
626 * @line: the buffer to store
627 * @len: the max. buffer size
628 *
629 * Reads one line from the buffer and stores the string.
630 *
631 * Return: Zero if successful, or 1 if error or EOF.
632 */
633 int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len)
634 {
635 int c = -1;
636
637 if (snd_BUG_ON(!buffer || !buffer->buffer))
638 return 1;
639 if (len <= 0 || buffer->stop || buffer->error)
640 return 1;
641 while (!buffer->stop) {
642 c = buffer->buffer[buffer->curr++];
643 if (buffer->curr >= buffer->size)
644 buffer->stop = 1;
645 if (c == '\n')
646 break;
647 if (len > 1) {
648 len--;
649 *line++ = c;
650 }
651 }
652 *line = '\0';
653 return 0;
654 }
655 EXPORT_SYMBOL(snd_info_get_line);
656
657 /**
658 * snd_info_get_str - parse a string token
659 * @dest: the buffer to store the string token
660 * @src: the original string
661 * @len: the max. length of token - 1
662 *
663 * Parses the original string and copy a token to the given
664 * string buffer.
665 *
666 * Return: The updated pointer of the original string so that
667 * it can be used for the next call.
668 */
669 const char *snd_info_get_str(char *dest, const char *src, int len)
670 {
671 int c;
672
673 while (*src == ' ' || *src == '\t')
674 src++;
675 if (*src == '"' || *src == '\'') {
676 c = *src++;
677 while (--len > 0 && *src && *src != c) {
678 *dest++ = *src++;
679 }
680 if (*src == c)
681 src++;
682 } else {
683 while (--len > 0 && *src && *src != ' ' && *src != '\t') {
684 *dest++ = *src++;
685 }
686 }
687 *dest = 0;
688 while (*src == ' ' || *src == '\t')
689 src++;
690 return src;
691 }
692 EXPORT_SYMBOL(snd_info_get_str);
693
694 /*
695 * snd_info_create_entry - create an info entry
696 * @name: the proc file name
697 * @parent: the parent directory
698 *
699 * Creates an info entry with the given file name and initializes as
700 * the default state.
701 *
702 * Usually called from other functions such as
703 * snd_info_create_card_entry().
704 *
705 * Return: The pointer of the new instance, or %NULL on failure.
706 */
707 static struct snd_info_entry *
708 snd_info_create_entry(const char *name, struct snd_info_entry *parent)
709 {
710 struct snd_info_entry *entry;
711 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
712 if (entry == NULL)
713 return NULL;
714 entry->name = kstrdup(name, GFP_KERNEL);
715 if (entry->name == NULL) {
716 kfree(entry);
717 return NULL;
718 }
719 entry->mode = S_IFREG | S_IRUGO;
720 entry->content = SNDRV_INFO_CONTENT_TEXT;
721 mutex_init(&entry->access);
722 INIT_LIST_HEAD(&entry->children);
723 INIT_LIST_HEAD(&entry->list);
724 entry->parent = parent;
725 if (parent)
726 list_add_tail(&entry->list, &parent->children);
727 return entry;
728 }
729
730 /**
731 * snd_info_create_module_entry - create an info entry for the given module
732 * @module: the module pointer
733 * @name: the file name
734 * @parent: the parent directory
735 *
736 * Creates a new info entry and assigns it to the given module.
737 *
738 * Return: The pointer of the new instance, or %NULL on failure.
739 */
740 struct snd_info_entry *snd_info_create_module_entry(struct module * module,
741 const char *name,
742 struct snd_info_entry *parent)
743 {
744 struct snd_info_entry *entry = snd_info_create_entry(name, parent);
745 if (entry)
746 entry->module = module;
747 return entry;
748 }
749 EXPORT_SYMBOL(snd_info_create_module_entry);
750
751 /**
752 * snd_info_create_card_entry - create an info entry for the given card
753 * @card: the card instance
754 * @name: the file name
755 * @parent: the parent directory
756 *
757 * Creates a new info entry and assigns it to the given card.
758 *
759 * Return: The pointer of the new instance, or %NULL on failure.
760 */
761 struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
762 const char *name,
763 struct snd_info_entry * parent)
764 {
765 struct snd_info_entry *entry = snd_info_create_entry(name, parent);
766 if (entry) {
767 entry->module = card->module;
768 entry->card = card;
769 }
770 return entry;
771 }
772 EXPORT_SYMBOL(snd_info_create_card_entry);
773
774 static void snd_info_disconnect(struct snd_info_entry *entry)
775 {
776 struct snd_info_entry *p;
777
778 if (!entry->p)
779 return;
780 list_for_each_entry(p, &entry->children, list)
781 snd_info_disconnect(p);
782 proc_remove(entry->p);
783 entry->p = NULL;
784 }
785
786 /**
787 * snd_info_free_entry - release the info entry
788 * @entry: the info entry
789 *
790 * Releases the info entry.
791 */
792 void snd_info_free_entry(struct snd_info_entry * entry)
793 {
794 struct snd_info_entry *p, *n;
795
796 if (!entry)
797 return;
798 if (entry->p) {
799 mutex_lock(&info_mutex);
800 snd_info_disconnect(entry);
801 mutex_unlock(&info_mutex);
802 }
803
804 /* free all children at first */
805 list_for_each_entry_safe(p, n, &entry->children, list)
806 snd_info_free_entry(p);
807
808 list_del(&entry->list);
809 kfree(entry->name);
810 if (entry->private_free)
811 entry->private_free(entry);
812 kfree(entry);
813 }
814 EXPORT_SYMBOL(snd_info_free_entry);
815
816 /**
817 * snd_info_register - register the info entry
818 * @entry: the info entry
819 *
820 * Registers the proc info entry.
821 *
822 * Return: Zero if successful, or a negative error code on failure.
823 */
824 int snd_info_register(struct snd_info_entry * entry)
825 {
826 struct proc_dir_entry *root, *p = NULL;
827
828 if (snd_BUG_ON(!entry))
829 return -ENXIO;
830 root = entry->parent == NULL ? snd_proc_root->p : entry->parent->p;
831 mutex_lock(&info_mutex);
832 if (S_ISDIR(entry->mode)) {
833 p = proc_mkdir_mode(entry->name, entry->mode, root);
834 if (!p) {
835 mutex_unlock(&info_mutex);
836 return -ENOMEM;
837 }
838 } else {
839 const struct file_operations *ops;
840 if (entry->content == SNDRV_INFO_CONTENT_DATA)
841 ops = &snd_info_entry_operations;
842 else
843 ops = &snd_info_text_entry_ops;
844 p = proc_create_data(entry->name, entry->mode, root,
845 ops, entry);
846 if (!p) {
847 mutex_unlock(&info_mutex);
848 return -ENOMEM;
849 }
850 proc_set_size(p, entry->size);
851 }
852 entry->p = p;
853 mutex_unlock(&info_mutex);
854 return 0;
855 }
856 EXPORT_SYMBOL(snd_info_register);
857
858 /*
859
860 */
861
862 static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
863 {
864 snd_iprintf(buffer,
865 "Advanced Linux Sound Architecture Driver Version k%s.\n",
866 init_utsname()->release);
867 }
868
869 static int __init snd_info_version_init(void)
870 {
871 struct snd_info_entry *entry;
872
873 entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL);
874 if (entry == NULL)
875 return -ENOMEM;
876 entry->c.text.read = snd_info_version_read;
877 return snd_info_register(entry); /* freed in error path */
878 }
Linux with added FPC-III support