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Linux 4.1.16
[linux/fpc-iii.git] / sound / core / info.c
blob9f404e965ea26366e6ad9ec65e4946263650fd37
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 /*
37 *
38 */
39
40 #ifdef CONFIG_PROC_FS
41
42 int snd_info_check_reserved_words(const char *str)
43 {
44 static char *reserved[] =
45 {
46 "version",
47 "meminfo",
48 "memdebug",
49 "detect",
50 "devices",
51 "oss",
52 "cards",
53 "timers",
54 "synth",
55 "pcm",
56 "seq",
57 NULL
58 };
59 char **xstr = reserved;
60
61 while (*xstr) {
62 if (!strcmp(*xstr, str))
63 return 0;
64 xstr++;
65 }
66 if (!strncmp(str, "card", 4))
67 return 0;
68 return 1;
69 }
70
71 static DEFINE_MUTEX(info_mutex);
72
73 struct snd_info_private_data {
74 struct snd_info_buffer *rbuffer;
75 struct snd_info_buffer *wbuffer;
76 struct snd_info_entry *entry;
77 void *file_private_data;
78 };
79
80 static int snd_info_version_init(void);
81 static int snd_info_version_done(void);
82 static void snd_info_disconnect(struct snd_info_entry *entry);
83
84
85 /* resize the proc r/w buffer */
86 static int resize_info_buffer(struct snd_info_buffer *buffer,
87 unsigned int nsize)
88 {
89 char *nbuf;
90
91 nsize = PAGE_ALIGN(nsize);
92 nbuf = krealloc(buffer->buffer, nsize, GFP_KERNEL | __GFP_ZERO);
93 if (! nbuf)
94 return -ENOMEM;
95
96 buffer->buffer = nbuf;
97 buffer->len = nsize;
98 return 0;
99 }
100
101 /**
102 * snd_iprintf - printf on the procfs buffer
103 * @buffer: the procfs buffer
104 * @fmt: the printf format
105 *
106 * Outputs the string on the procfs buffer just like printf().
107 *
108 * Return: The size of output string, or a negative error code.
109 */
110 int snd_iprintf(struct snd_info_buffer *buffer, const char *fmt, ...)
111 {
112 va_list args;
113 int len, res;
114 int err = 0;
115
116 might_sleep();
117 if (buffer->stop || buffer->error)
118 return 0;
119 len = buffer->len - buffer->size;
120 va_start(args, fmt);
121 for (;;) {
122 va_list ap;
123 va_copy(ap, args);
124 res = vsnprintf(buffer->buffer + buffer->curr, len, fmt, ap);
125 va_end(ap);
126 if (res < len)
127 break;
128 err = resize_info_buffer(buffer, buffer->len + PAGE_SIZE);
129 if (err < 0)
130 break;
131 len = buffer->len - buffer->size;
132 }
133 va_end(args);
134
135 if (err < 0)
136 return err;
137 buffer->curr += res;
138 buffer->size += res;
139 return res;
140 }
141
142 EXPORT_SYMBOL(snd_iprintf);
143
144 /*
145
146 */
147
148 static struct proc_dir_entry *snd_proc_root;
149 struct snd_info_entry *snd_seq_root;
150 EXPORT_SYMBOL(snd_seq_root);
151
152 #ifdef CONFIG_SND_OSSEMUL
153 struct snd_info_entry *snd_oss_root;
154 #endif
155
156 static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
157 {
158 struct snd_info_private_data *data;
159 struct snd_info_entry *entry;
160 loff_t ret = -EINVAL, size;
161
162 data = file->private_data;
163 entry = data->entry;
164 mutex_lock(&entry->access);
165 if (entry->content == SNDRV_INFO_CONTENT_DATA &&
166 entry->c.ops->llseek) {
167 offset = entry->c.ops->llseek(entry,
168 data->file_private_data,
169 file, offset, orig);
170 goto out;
171 }
172 if (entry->content == SNDRV_INFO_CONTENT_DATA)
173 size = entry->size;
174 else
175 size = 0;
176 switch (orig) {
177 case SEEK_SET:
178 break;
179 case SEEK_CUR:
180 offset += file->f_pos;
181 break;
182 case SEEK_END:
183 if (!size)
184 goto out;
185 offset += size;
186 break;
187 default:
188 goto out;
189 }
190 if (offset < 0)
191 goto out;
192 if (size && offset > size)
193 offset = size;
194 file->f_pos = offset;
195 ret = offset;
196 out:
197 mutex_unlock(&entry->access);
198 return ret;
199 }
200
201 static ssize_t snd_info_entry_read(struct file *file, char __user *buffer,
202 size_t count, loff_t * offset)
203 {
204 struct snd_info_private_data *data;
205 struct snd_info_entry *entry;
206 struct snd_info_buffer *buf;
207 size_t size = 0;
208 loff_t pos;
209
210 data = file->private_data;
211 if (snd_BUG_ON(!data))
212 return -ENXIO;
213 pos = *offset;
214 if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
215 return -EIO;
216 if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
217 return -EIO;
218 entry = data->entry;
219 switch (entry->content) {
220 case SNDRV_INFO_CONTENT_TEXT:
221 buf = data->rbuffer;
222 if (buf == NULL)
223 return -EIO;
224 if (pos >= buf->size)
225 return 0;
226 size = buf->size - pos;
227 size = min(count, size);
228 if (copy_to_user(buffer, buf->buffer + pos, size))
229 return -EFAULT;
230 break;
231 case SNDRV_INFO_CONTENT_DATA:
232 if (pos >= entry->size)
233 return 0;
234 if (entry->c.ops->read) {
235 size = entry->size - pos;
236 size = min(count, size);
237 size = entry->c.ops->read(entry,
238 data->file_private_data,
239 file, buffer, size, pos);
240 }
241 break;
242 }
243 if ((ssize_t) size > 0)
244 *offset = pos + size;
245 return size;
246 }
247
248 static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer,
249 size_t count, loff_t * offset)
250 {
251 struct snd_info_private_data *data;
252 struct snd_info_entry *entry;
253 struct snd_info_buffer *buf;
254 ssize_t size = 0;
255 loff_t pos;
256
257 data = file->private_data;
258 if (snd_BUG_ON(!data))
259 return -ENXIO;
260 entry = data->entry;
261 pos = *offset;
262 if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
263 return -EIO;
264 if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
265 return -EIO;
266 switch (entry->content) {
267 case SNDRV_INFO_CONTENT_TEXT:
268 buf = data->wbuffer;
269 if (buf == NULL)
270 return -EIO;
271 mutex_lock(&entry->access);
272 if (pos + count >= buf->len) {
273 if (resize_info_buffer(buf, pos + count)) {
274 mutex_unlock(&entry->access);
275 return -ENOMEM;
276 }
277 }
278 if (copy_from_user(buf->buffer + pos, buffer, count)) {
279 mutex_unlock(&entry->access);
280 return -EFAULT;
281 }
282 buf->size = pos + count;
283 mutex_unlock(&entry->access);
284 size = count;
285 break;
286 case SNDRV_INFO_CONTENT_DATA:
287 if (entry->c.ops->write && count > 0) {
288 size_t maxsize = entry->size - pos;
289 count = min(count, maxsize);
290 size = entry->c.ops->write(entry,
291 data->file_private_data,
292 file, buffer, count, pos);
293 }
294 break;
295 }
296 if ((ssize_t) size > 0)
297 *offset = pos + size;
298 return size;
299 }
300
301 static int snd_info_entry_open(struct inode *inode, struct file *file)
302 {
303 struct snd_info_entry *entry;
304 struct snd_info_private_data *data;
305 struct snd_info_buffer *buffer;
306 int mode, err;
307
308 mutex_lock(&info_mutex);
309 entry = PDE_DATA(inode);
310 if (entry == NULL || ! entry->p) {
311 mutex_unlock(&info_mutex);
312 return -ENODEV;
313 }
314 if (!try_module_get(entry->module)) {
315 err = -EFAULT;
316 goto __error1;
317 }
318 mode = file->f_flags & O_ACCMODE;
319 if (mode == O_RDONLY || mode == O_RDWR) {
320 if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
321 entry->c.ops->read == NULL)) {
322 err = -ENODEV;
323 goto __error;
324 }
325 }
326 if (mode == O_WRONLY || mode == O_RDWR) {
327 if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
328 entry->c.ops->write == NULL)) {
329 err = -ENODEV;
330 goto __error;
331 }
332 }
333 data = kzalloc(sizeof(*data), GFP_KERNEL);
334 if (data == NULL) {
335 err = -ENOMEM;
336 goto __error;
337 }
338 data->entry = entry;
339 switch (entry->content) {
340 case SNDRV_INFO_CONTENT_TEXT:
341 if (mode == O_RDONLY || mode == O_RDWR) {
342 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
343 if (buffer == NULL)
344 goto __nomem;
345 data->rbuffer = buffer;
346 buffer->len = PAGE_SIZE;
347 buffer->buffer = kzalloc(buffer->len, GFP_KERNEL);
348 if (buffer->buffer == NULL)
349 goto __nomem;
350 }
351 if (mode == O_WRONLY || mode == O_RDWR) {
352 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
353 if (buffer == NULL)
354 goto __nomem;
355 data->wbuffer = buffer;
356 buffer->len = PAGE_SIZE;
357 buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
358 if (buffer->buffer == NULL)
359 goto __nomem;
360 }
361 break;
362 case SNDRV_INFO_CONTENT_DATA: /* data */
363 if (entry->c.ops->open) {
364 if ((err = entry->c.ops->open(entry, mode,
365 &data->file_private_data)) < 0) {
366 kfree(data);
367 goto __error;
368 }
369 }
370 break;
371 }
372 file->private_data = data;
373 mutex_unlock(&info_mutex);
374 if (entry->content == SNDRV_INFO_CONTENT_TEXT &&
375 (mode == O_RDONLY || mode == O_RDWR)) {
376 if (entry->c.text.read) {
377 mutex_lock(&entry->access);
378 entry->c.text.read(entry, data->rbuffer);
379 mutex_unlock(&entry->access);
380 }
381 }
382 return 0;
383
384 __nomem:
385 if (data->rbuffer) {
386 kfree(data->rbuffer->buffer);
387 kfree(data->rbuffer);
388 }
389 if (data->wbuffer) {
390 kfree(data->wbuffer->buffer);
391 kfree(data->wbuffer);
392 }
393 kfree(data);
394 err = -ENOMEM;
395 __error:
396 module_put(entry->module);
397 __error1:
398 mutex_unlock(&info_mutex);
399 return err;
400 }
401
402 static int snd_info_entry_release(struct inode *inode, struct file *file)
403 {
404 struct snd_info_entry *entry;
405 struct snd_info_private_data *data;
406 int mode;
407
408 mode = file->f_flags & O_ACCMODE;
409 data = file->private_data;
410 entry = data->entry;
411 switch (entry->content) {
412 case SNDRV_INFO_CONTENT_TEXT:
413 if (data->rbuffer) {
414 kfree(data->rbuffer->buffer);
415 kfree(data->rbuffer);
416 }
417 if (data->wbuffer) {
418 if (entry->c.text.write) {
419 entry->c.text.write(entry, data->wbuffer);
420 if (data->wbuffer->error) {
421 if (entry->card)
422 dev_warn(entry->card->dev, "info: data write error to %s (%i)\n",
423 entry->name,
424 data->wbuffer->error);
425 else
426 pr_warn("ALSA: info: data write error to %s (%i)\n",
427 entry->name,
428 data->wbuffer->error);
429 }
430 }
431 kfree(data->wbuffer->buffer);
432 kfree(data->wbuffer);
433 }
434 break;
435 case SNDRV_INFO_CONTENT_DATA:
436 if (entry->c.ops->release)
437 entry->c.ops->release(entry, mode,
438 data->file_private_data);
439 break;
440 }
441 module_put(entry->module);
442 kfree(data);
443 return 0;
444 }
445
446 static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait)
447 {
448 struct snd_info_private_data *data;
449 struct snd_info_entry *entry;
450 unsigned int mask;
451
452 data = file->private_data;
453 if (data == NULL)
454 return 0;
455 entry = data->entry;
456 mask = 0;
457 switch (entry->content) {
458 case SNDRV_INFO_CONTENT_DATA:
459 if (entry->c.ops->poll)
460 return entry->c.ops->poll(entry,
461 data->file_private_data,
462 file, wait);
463 if (entry->c.ops->read)
464 mask |= POLLIN | POLLRDNORM;
465 if (entry->c.ops->write)
466 mask |= POLLOUT | POLLWRNORM;
467 break;
468 }
469 return mask;
470 }
471
472 static long snd_info_entry_ioctl(struct file *file, unsigned int cmd,
473 unsigned long arg)
474 {
475 struct snd_info_private_data *data;
476 struct snd_info_entry *entry;
477
478 data = file->private_data;
479 if (data == NULL)
480 return 0;
481 entry = data->entry;
482 switch (entry->content) {
483 case SNDRV_INFO_CONTENT_DATA:
484 if (entry->c.ops->ioctl)
485 return entry->c.ops->ioctl(entry,
486 data->file_private_data,
487 file, cmd, arg);
488 break;
489 }
490 return -ENOTTY;
491 }
492
493 static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma)
494 {
495 struct inode *inode = file_inode(file);
496 struct snd_info_private_data *data;
497 struct snd_info_entry *entry;
498
499 data = file->private_data;
500 if (data == NULL)
501 return 0;
502 entry = data->entry;
503 switch (entry->content) {
504 case SNDRV_INFO_CONTENT_DATA:
505 if (entry->c.ops->mmap)
506 return entry->c.ops->mmap(entry,
507 data->file_private_data,
508 inode, file, vma);
509 break;
510 }
511 return -ENXIO;
512 }
513
514 static const struct file_operations snd_info_entry_operations =
515 {
516 .owner = THIS_MODULE,
517 .llseek = snd_info_entry_llseek,
518 .read = snd_info_entry_read,
519 .write = snd_info_entry_write,
520 .poll = snd_info_entry_poll,
521 .unlocked_ioctl = snd_info_entry_ioctl,
522 .mmap = snd_info_entry_mmap,
523 .open = snd_info_entry_open,
524 .release = snd_info_entry_release,
525 };
526
527 int __init snd_info_init(void)
528 {
529 struct proc_dir_entry *p;
530
531 p = proc_mkdir("asound", NULL);
532 if (p == NULL)
533 return -ENOMEM;
534 snd_proc_root = p;
535 #ifdef CONFIG_SND_OSSEMUL
536 {
537 struct snd_info_entry *entry;
538 if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL)
539 return -ENOMEM;
540 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
541 if (snd_info_register(entry) < 0) {
542 snd_info_free_entry(entry);
543 return -ENOMEM;
544 }
545 snd_oss_root = entry;
546 }
547 #endif
548 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
549 {
550 struct snd_info_entry *entry;
551 if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL)
552 return -ENOMEM;
553 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
554 if (snd_info_register(entry) < 0) {
555 snd_info_free_entry(entry);
556 return -ENOMEM;
557 }
558 snd_seq_root = entry;
559 }
560 #endif
561 snd_info_version_init();
562 snd_minor_info_init();
563 snd_minor_info_oss_init();
564 snd_card_info_init();
565 return 0;
566 }
567
568 int __exit snd_info_done(void)
569 {
570 snd_card_info_done();
571 snd_minor_info_oss_done();
572 snd_minor_info_done();
573 snd_info_version_done();
574 if (snd_proc_root) {
575 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
576 snd_info_free_entry(snd_seq_root);
577 #endif
578 #ifdef CONFIG_SND_OSSEMUL
579 snd_info_free_entry(snd_oss_root);
580 #endif
581 proc_remove(snd_proc_root);
582 }
583 return 0;
584 }
585
586 /*
587
588 */
589
590
591 /*
592 * create a card proc file
593 * called from init.c
594 */
595 int snd_info_card_create(struct snd_card *card)
596 {
597 char str[8];
598 struct snd_info_entry *entry;
599
600 if (snd_BUG_ON(!card))
601 return -ENXIO;
602
603 sprintf(str, "card%i", card->number);
604 if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL)
605 return -ENOMEM;
606 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
607 if (snd_info_register(entry) < 0) {
608 snd_info_free_entry(entry);
609 return -ENOMEM;
610 }
611 card->proc_root = entry;
612 return 0;
613 }
614
615 /*
616 * register the card proc file
617 * called from init.c
618 */
619 int snd_info_card_register(struct snd_card *card)
620 {
621 struct proc_dir_entry *p;
622
623 if (snd_BUG_ON(!card))
624 return -ENXIO;
625
626 if (!strcmp(card->id, card->proc_root->name))
627 return 0;
628
629 p = proc_symlink(card->id, snd_proc_root, card->proc_root->name);
630 if (p == NULL)
631 return -ENOMEM;
632 card->proc_root_link = p;
633 return 0;
634 }
635
636 /*
637 * called on card->id change
638 */
639 void snd_info_card_id_change(struct snd_card *card)
640 {
641 mutex_lock(&info_mutex);
642 if (card->proc_root_link) {
643 proc_remove(card->proc_root_link);
644 card->proc_root_link = NULL;
645 }
646 if (strcmp(card->id, card->proc_root->name))
647 card->proc_root_link = proc_symlink(card->id,
648 snd_proc_root,
649 card->proc_root->name);
650 mutex_unlock(&info_mutex);
651 }
652
653 /*
654 * de-register the card proc file
655 * called from init.c
656 */
657 void snd_info_card_disconnect(struct snd_card *card)
658 {
659 if (!card)
660 return;
661 mutex_lock(&info_mutex);
662 proc_remove(card->proc_root_link);
663 card->proc_root_link = NULL;
664 if (card->proc_root)
665 snd_info_disconnect(card->proc_root);
666 mutex_unlock(&info_mutex);
667 }
668
669 /*
670 * release the card proc file resources
671 * called from init.c
672 */
673 int snd_info_card_free(struct snd_card *card)
674 {
675 if (!card)
676 return 0;
677 snd_info_free_entry(card->proc_root);
678 card->proc_root = NULL;
679 return 0;
680 }
681
682
683 /**
684 * snd_info_get_line - read one line from the procfs buffer
685 * @buffer: the procfs buffer
686 * @line: the buffer to store
687 * @len: the max. buffer size
688 *
689 * Reads one line from the buffer and stores the string.
690 *
691 * Return: Zero if successful, or 1 if error or EOF.
692 */
693 int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len)
694 {
695 int c = -1;
696
697 if (snd_BUG_ON(!buffer || !buffer->buffer))
698 return 1;
699 if (len <= 0 || buffer->stop || buffer->error)
700 return 1;
701 while (!buffer->stop) {
702 c = buffer->buffer[buffer->curr++];
703 if (buffer->curr >= buffer->size)
704 buffer->stop = 1;
705 if (c == '\n')
706 break;
707 if (len > 1) {
708 len--;
709 *line++ = c;
710 }
711 }
712 *line = '\0';
713 return 0;
714 }
715
716 EXPORT_SYMBOL(snd_info_get_line);
717
718 /**
719 * snd_info_get_str - parse a string token
720 * @dest: the buffer to store the string token
721 * @src: the original string
722 * @len: the max. length of token - 1
723 *
724 * Parses the original string and copy a token to the given
725 * string buffer.
726 *
727 * Return: The updated pointer of the original string so that
728 * it can be used for the next call.
729 */
730 const char *snd_info_get_str(char *dest, const char *src, int len)
731 {
732 int c;
733
734 while (*src == ' ' || *src == '\t')
735 src++;
736 if (*src == '"' || *src == '\'') {
737 c = *src++;
738 while (--len > 0 && *src && *src != c) {
739 *dest++ = *src++;
740 }
741 if (*src == c)
742 src++;
743 } else {
744 while (--len > 0 && *src && *src != ' ' && *src != '\t') {
745 *dest++ = *src++;
746 }
747 }
748 *dest = 0;
749 while (*src == ' ' || *src == '\t')
750 src++;
751 return src;
752 }
753
754 EXPORT_SYMBOL(snd_info_get_str);
755
756 /**
757 * snd_info_create_entry - create an info entry
758 * @name: the proc file name
759 *
760 * Creates an info entry with the given file name and initializes as
761 * the default state.
762 *
763 * Usually called from other functions such as
764 * snd_info_create_card_entry().
765 *
766 * Return: The pointer of the new instance, or %NULL on failure.
767 */
768 static struct snd_info_entry *snd_info_create_entry(const char *name)
769 {
770 struct snd_info_entry *entry;
771 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
772 if (entry == NULL)
773 return NULL;
774 entry->name = kstrdup(name, GFP_KERNEL);
775 if (entry->name == NULL) {
776 kfree(entry);
777 return NULL;
778 }
779 entry->mode = S_IFREG | S_IRUGO;
780 entry->content = SNDRV_INFO_CONTENT_TEXT;
781 mutex_init(&entry->access);
782 INIT_LIST_HEAD(&entry->children);
783 INIT_LIST_HEAD(&entry->list);
784 return entry;
785 }
786
787 /**
788 * snd_info_create_module_entry - create an info entry for the given module
789 * @module: the module pointer
790 * @name: the file name
791 * @parent: the parent directory
792 *
793 * Creates a new info entry and assigns it to the given module.
794 *
795 * Return: The pointer of the new instance, or %NULL on failure.
796 */
797 struct snd_info_entry *snd_info_create_module_entry(struct module * module,
798 const char *name,
799 struct snd_info_entry *parent)
800 {
801 struct snd_info_entry *entry = snd_info_create_entry(name);
802 if (entry) {
803 entry->module = module;
804 entry->parent = parent;
805 }
806 return entry;
807 }
808
809 EXPORT_SYMBOL(snd_info_create_module_entry);
810
811 /**
812 * snd_info_create_card_entry - create an info entry for the given card
813 * @card: the card instance
814 * @name: the file name
815 * @parent: the parent directory
816 *
817 * Creates a new info entry and assigns it to the given card.
818 *
819 * Return: The pointer of the new instance, or %NULL on failure.
820 */
821 struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
822 const char *name,
823 struct snd_info_entry * parent)
824 {
825 struct snd_info_entry *entry = snd_info_create_entry(name);
826 if (entry) {
827 entry->module = card->module;
828 entry->card = card;
829 entry->parent = parent;
830 }
831 return entry;
832 }
833
834 EXPORT_SYMBOL(snd_info_create_card_entry);
835
836 static void snd_info_disconnect(struct snd_info_entry *entry)
837 {
838 struct list_head *p, *n;
839 struct proc_dir_entry *root;
840
841 list_for_each_safe(p, n, &entry->children) {
842 snd_info_disconnect(list_entry(p, struct snd_info_entry, list));
843 }
844
845 if (! entry->p)
846 return;
847 list_del_init(&entry->list);
848 root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
849 snd_BUG_ON(!root);
850 proc_remove(entry->p);
851 entry->p = NULL;
852 }
853
854 static int snd_info_dev_free_entry(struct snd_device *device)
855 {
856 struct snd_info_entry *entry = device->device_data;
857 snd_info_free_entry(entry);
858 return 0;
859 }
860
861 static int snd_info_dev_register_entry(struct snd_device *device)
862 {
863 struct snd_info_entry *entry = device->device_data;
864 return snd_info_register(entry);
865 }
866
867 /**
868 * snd_card_proc_new - create an info entry for the given card
869 * @card: the card instance
870 * @name: the file name
871 * @entryp: the pointer to store the new info entry
872 *
873 * Creates a new info entry and assigns it to the given card.
874 * Unlike snd_info_create_card_entry(), this function registers the
875 * info entry as an ALSA device component, so that it can be
876 * unregistered/released without explicit call.
877 * Also, you don't have to register this entry via snd_info_register(),
878 * since this will be registered by snd_card_register() automatically.
879 *
880 * The parent is assumed as card->proc_root.
881 *
882 * For releasing this entry, use snd_device_free() instead of
883 * snd_info_free_entry().
884 *
885 * Return: Zero if successful, or a negative error code on failure.
886 */
887 int snd_card_proc_new(struct snd_card *card, const char *name,
888 struct snd_info_entry **entryp)
889 {
890 static struct snd_device_ops ops = {
891 .dev_free = snd_info_dev_free_entry,
892 .dev_register = snd_info_dev_register_entry,
893 /* disconnect is done via snd_info_card_disconnect() */
894 };
895 struct snd_info_entry *entry;
896 int err;
897
898 entry = snd_info_create_card_entry(card, name, card->proc_root);
899 if (! entry)
900 return -ENOMEM;
901 if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) {
902 snd_info_free_entry(entry);
903 return err;
904 }
905 if (entryp)
906 *entryp = entry;
907 return 0;
908 }
909
910 EXPORT_SYMBOL(snd_card_proc_new);
911
912 /**
913 * snd_info_free_entry - release the info entry
914 * @entry: the info entry
915 *
916 * Releases the info entry. Don't call this after registered.
917 */
918 void snd_info_free_entry(struct snd_info_entry * entry)
919 {
920 if (entry == NULL)
921 return;
922 if (entry->p) {
923 mutex_lock(&info_mutex);
924 snd_info_disconnect(entry);
925 mutex_unlock(&info_mutex);
926 }
927 kfree(entry->name);
928 if (entry->private_free)
929 entry->private_free(entry);
930 kfree(entry);
931 }
932
933 EXPORT_SYMBOL(snd_info_free_entry);
934
935 /**
936 * snd_info_register - register the info entry
937 * @entry: the info entry
938 *
939 * Registers the proc info entry.
940 *
941 * Return: Zero if successful, or a negative error code on failure.
942 */
943 int snd_info_register(struct snd_info_entry * entry)
944 {
945 struct proc_dir_entry *root, *p = NULL;
946
947 if (snd_BUG_ON(!entry))
948 return -ENXIO;
949 root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
950 mutex_lock(&info_mutex);
951 if (S_ISDIR(entry->mode)) {
952 p = proc_mkdir_mode(entry->name, entry->mode, root);
953 if (!p) {
954 mutex_unlock(&info_mutex);
955 return -ENOMEM;
956 }
957 } else {
958 p = proc_create_data(entry->name, entry->mode, root,
959 &snd_info_entry_operations, entry);
960 if (!p) {
961 mutex_unlock(&info_mutex);
962 return -ENOMEM;
963 }
964 proc_set_size(p, entry->size);
965 }
966 entry->p = p;
967 if (entry->parent)
968 list_add_tail(&entry->list, &entry->parent->children);
969 mutex_unlock(&info_mutex);
970 return 0;
971 }
972
973 EXPORT_SYMBOL(snd_info_register);
974
975 /*
976
977 */
978
979 static struct snd_info_entry *snd_info_version_entry;
980
981 static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
982 {
983 snd_iprintf(buffer,
984 "Advanced Linux Sound Architecture Driver Version k%s.\n",
985 init_utsname()->release);
986 }
987
988 static int __init snd_info_version_init(void)
989 {
990 struct snd_info_entry *entry;
991
992 entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL);
993 if (entry == NULL)
994 return -ENOMEM;
995 entry->c.text.read = snd_info_version_read;
996 if (snd_info_register(entry) < 0) {
997 snd_info_free_entry(entry);
998 return -ENOMEM;
999 }
1000 snd_info_version_entry = entry;
1001 return 0;
1002 }
1003
1004 static int __exit snd_info_version_done(void)
1005 {
1006 snd_info_free_entry(snd_info_version_entry);
1007 return 0;
1008 }
1009
1010 #endif /* CONFIG_PROC_FS */
Linux with added FPC-III support