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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 <sound/core.h>
28#include <sound/minors.h>
29#include <sound/info.h>
30#include <sound/version.h>
31#include <linux/proc_fs.h>
32#include <linux/mutex.h>
33#include <stdarg.h>
34
35/*
36 *
37 */
38
39#ifdef CONFIG_PROC_FS
40
41int snd_info_check_reserved_words(const char *str)
42{
43 static char *reserved[] =
44 {
45 "version",
46 "meminfo",
47 "memdebug",
48 "detect",
49 "devices",
50 "oss",
51 "cards",
52 "timers",
53 "synth",
54 "pcm",
55 "seq",
56 NULL
57 };
58 char **xstr = reserved;
59
60 while (*xstr) {
61 if (!strcmp(*xstr, str))
62 return 0;
63 xstr++;
64 }
65 if (!strncmp(str, "card", 4))
66 return 0;
67 return 1;
68}
69
70static DEFINE_MUTEX(info_mutex);
71
72struct snd_info_private_data {
73 struct snd_info_buffer *rbuffer;
74 struct snd_info_buffer *wbuffer;
75 struct snd_info_entry *entry;
76 void *file_private_data;
77};
78
79static int snd_info_version_init(void);
80static int snd_info_version_done(void);
81static void snd_info_disconnect(struct snd_info_entry *entry);
82
83
84/* resize the proc r/w buffer */
85static int resize_info_buffer(struct snd_info_buffer *buffer,
86 unsigned int nsize)
87{
88 char *nbuf;
89
90 nsize = PAGE_ALIGN(nsize);
91 nbuf = krealloc(buffer->buffer, nsize, GFP_KERNEL);
92 if (! nbuf)
93 return -ENOMEM;
94
95 buffer->buffer = nbuf;
96 buffer->len = nsize;
97 return 0;
98}
99
100/**
101 * snd_iprintf - printf on the procfs buffer
102 * @buffer: the procfs buffer
103 * @fmt: the printf format
104 *
105 * Outputs the string on the procfs buffer just like printf().
106 *
107 * Returns the size of output string.
108 */
109int snd_iprintf(struct snd_info_buffer *buffer, const char *fmt, ...)
110{
111 va_list args;
112 int len, res;
113 int err = 0;
114
115 might_sleep();
116 if (buffer->stop || buffer->error)
117 return 0;
118 len = buffer->len - buffer->size;
119 va_start(args, fmt);
120 for (;;) {
121 va_list ap;
122 va_copy(ap, args);
123 res = vsnprintf(buffer->buffer + buffer->curr, len, fmt, ap);
124 va_end(ap);
125 if (res < len)
126 break;
127 err = resize_info_buffer(buffer, buffer->len + PAGE_SIZE);
128 if (err < 0)
129 break;
130 len = buffer->len - buffer->size;
131 }
132 va_end(args);
133
134 if (err < 0)
135 return err;
136 buffer->curr += res;
137 buffer->size += res;
138 return res;
139}
140
141EXPORT_SYMBOL(snd_iprintf);
142
143/*
144
145 */
146
147static struct proc_dir_entry *snd_proc_root;
148struct snd_info_entry *snd_seq_root;
149EXPORT_SYMBOL(snd_seq_root);
150
151#ifdef CONFIG_SND_OSSEMUL
152struct snd_info_entry *snd_oss_root;
153#endif
154
155static void snd_remove_proc_entry(struct proc_dir_entry *parent,
156 struct proc_dir_entry *de)
157{
158 if (de)
159 remove_proc_entry(de->name, parent);
160}
161
162static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
163{
164 struct snd_info_private_data *data;
165 struct snd_info_entry *entry;
166 loff_t ret = -EINVAL, size;
167
168 data = file->private_data;
169 entry = data->entry;
170 mutex_lock(&entry->access);
171 if (entry->content == SNDRV_INFO_CONTENT_DATA &&
172 entry->c.ops->llseek) {
173 offset = entry->c.ops->llseek(entry,
174 data->file_private_data,
175 file, offset, orig);
176 goto out;
177 }
178 if (entry->content == SNDRV_INFO_CONTENT_DATA)
179 size = entry->size;
180 else
181 size = 0;
182 switch (orig) {
183 case SEEK_SET:
184 break;
185 case SEEK_CUR:
186 offset += file->f_pos;
187 break;
188 case SEEK_END:
189 if (!size)
190 goto out;
191 offset += size;
192 break;
193 default:
194 goto out;
195 }
196 if (offset < 0)
197 goto out;
198 if (size && offset > size)
199 offset = size;
200 file->f_pos = offset;
201 ret = offset;
202 out:
203 mutex_unlock(&entry->access);
204 return ret;
205}
206
207static ssize_t snd_info_entry_read(struct file *file, char __user *buffer,
208 size_t count, loff_t * offset)
209{
210 struct snd_info_private_data *data;
211 struct snd_info_entry *entry;
212 struct snd_info_buffer *buf;
213 size_t size = 0;
214 loff_t pos;
215
216 data = file->private_data;
217 if (snd_BUG_ON(!data))
218 return -ENXIO;
219 pos = *offset;
220 if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
221 return -EIO;
222 if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
223 return -EIO;
224 entry = data->entry;
225 switch (entry->content) {
226 case SNDRV_INFO_CONTENT_TEXT:
227 buf = data->rbuffer;
228 if (buf == NULL)
229 return -EIO;
230 if (pos >= buf->size)
231 return 0;
232 size = buf->size - pos;
233 size = min(count, size);
234 if (copy_to_user(buffer, buf->buffer + pos, size))
235 return -EFAULT;
236 break;
237 case SNDRV_INFO_CONTENT_DATA:
238 if (pos >= entry->size)
239 return 0;
240 if (entry->c.ops->read) {
241 size = entry->size - pos;
242 size = min(count, size);
243 size = entry->c.ops->read(entry,
244 data->file_private_data,
245 file, buffer, size, pos);
246 }
247 break;
248 }
249 if ((ssize_t) size > 0)
250 *offset = pos + size;
251 return size;
252}
253
254static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer,
255 size_t count, loff_t * offset)
256{
257 struct snd_info_private_data *data;
258 struct snd_info_entry *entry;
259 struct snd_info_buffer *buf;
260 ssize_t size = 0;
261 loff_t pos;
262
263 data = file->private_data;
264 if (snd_BUG_ON(!data))
265 return -ENXIO;
266 entry = data->entry;
267 pos = *offset;
268 if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
269 return -EIO;
270 if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
271 return -EIO;
272 switch (entry->content) {
273 case SNDRV_INFO_CONTENT_TEXT:
274 buf = data->wbuffer;
275 if (buf == NULL)
276 return -EIO;
277 mutex_lock(&entry->access);
278 if (pos + count >= buf->len) {
279 if (resize_info_buffer(buf, pos + count)) {
280 mutex_unlock(&entry->access);
281 return -ENOMEM;
282 }
283 }
284 if (copy_from_user(buf->buffer + pos, buffer, count)) {
285 mutex_unlock(&entry->access);
286 return -EFAULT;
287 }
288 buf->size = pos + count;
289 mutex_unlock(&entry->access);
290 size = count;
291 break;
292 case SNDRV_INFO_CONTENT_DATA:
293 if (entry->c.ops->write && count > 0) {
294 size_t maxsize = entry->size - pos;
295 count = min(count, maxsize);
296 size = entry->c.ops->write(entry,
297 data->file_private_data,
298 file, buffer, count, pos);
299 }
300 break;
301 }
302 if ((ssize_t) size > 0)
303 *offset = pos + size;
304 return size;
305}
306
307static int snd_info_entry_open(struct inode *inode, struct file *file)
308{
309 struct snd_info_entry *entry;
310 struct snd_info_private_data *data;
311 struct snd_info_buffer *buffer;
312 struct proc_dir_entry *p;
313 int mode, err;
314
315 mutex_lock(&info_mutex);
316 p = PDE(inode);
317 entry = p == NULL ? NULL : (struct snd_info_entry *)p->data;
318 if (entry == NULL || ! entry->p) {
319 mutex_unlock(&info_mutex);
320 return -ENODEV;
321 }
322 if (!try_module_get(entry->module)) {
323 err = -EFAULT;
324 goto __error1;
325 }
326 mode = file->f_flags & O_ACCMODE;
327 if (mode == O_RDONLY || mode == O_RDWR) {
328 if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
329 entry->c.ops->read == NULL)) {
330 err = -ENODEV;
331 goto __error;
332 }
333 }
334 if (mode == O_WRONLY || mode == O_RDWR) {
335 if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
336 entry->c.ops->write == NULL)) {
337 err = -ENODEV;
338 goto __error;
339 }
340 }
341 data = kzalloc(sizeof(*data), GFP_KERNEL);
342 if (data == NULL) {
343 err = -ENOMEM;
344 goto __error;
345 }
346 data->entry = entry;
347 switch (entry->content) {
348 case SNDRV_INFO_CONTENT_TEXT:
349 if (mode == O_RDONLY || mode == O_RDWR) {
350 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
351 if (buffer == NULL)
352 goto __nomem;
353 data->rbuffer = buffer;
354 buffer->len = PAGE_SIZE;
355 buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
356 if (buffer->buffer == NULL)
357 goto __nomem;
358 }
359 if (mode == O_WRONLY || mode == O_RDWR) {
360 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
361 if (buffer == NULL)
362 goto __nomem;
363 data->wbuffer = buffer;
364 buffer->len = PAGE_SIZE;
365 buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
366 if (buffer->buffer == NULL)
367 goto __nomem;
368 }
369 break;
370 case SNDRV_INFO_CONTENT_DATA: /* data */
371 if (entry->c.ops->open) {
372 if ((err = entry->c.ops->open(entry, mode,
373 &data->file_private_data)) < 0) {
374 kfree(data);
375 goto __error;
376 }
377 }
378 break;
379 }
380 file->private_data = data;
381 mutex_unlock(&info_mutex);
382 if (entry->content == SNDRV_INFO_CONTENT_TEXT &&
383 (mode == O_RDONLY || mode == O_RDWR)) {
384 if (entry->c.text.read) {
385 mutex_lock(&entry->access);
386 entry->c.text.read(entry, data->rbuffer);
387 mutex_unlock(&entry->access);
388 }
389 }
390 return 0;
391
392 __nomem:
393 if (data->rbuffer) {
394 kfree(data->rbuffer->buffer);
395 kfree(data->rbuffer);
396 }
397 if (data->wbuffer) {
398 kfree(data->wbuffer->buffer);
399 kfree(data->wbuffer);
400 }
401 kfree(data);
402 err = -ENOMEM;
403 __error:
404 module_put(entry->module);
405 __error1:
406 mutex_unlock(&info_mutex);
407 return err;
408}
409
410static int snd_info_entry_release(struct inode *inode, struct file *file)
411{
412 struct snd_info_entry *entry;
413 struct snd_info_private_data *data;
414 int mode;
415
416 mode = file->f_flags & O_ACCMODE;
417 data = file->private_data;
418 entry = data->entry;
419 switch (entry->content) {
420 case SNDRV_INFO_CONTENT_TEXT:
421 if (data->rbuffer) {
422 kfree(data->rbuffer->buffer);
423 kfree(data->rbuffer);
424 }
425 if (data->wbuffer) {
426 if (entry->c.text.write) {
427 entry->c.text.write(entry, data->wbuffer);
428 if (data->wbuffer->error) {
429 snd_printk(KERN_WARNING "data write error to %s (%i)\n",
430 entry->name,
431 data->wbuffer->error);
432 }
433 }
434 kfree(data->wbuffer->buffer);
435 kfree(data->wbuffer);
436 }
437 break;
438 case SNDRV_INFO_CONTENT_DATA:
439 if (entry->c.ops->release)
440 entry->c.ops->release(entry, mode,
441 data->file_private_data);
442 break;
443 }
444 module_put(entry->module);
445 kfree(data);
446 return 0;
447}
448
449static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait)
450{
451 struct snd_info_private_data *data;
452 struct snd_info_entry *entry;
453 unsigned int mask;
454
455 data = file->private_data;
456 if (data == NULL)
457 return 0;
458 entry = data->entry;
459 mask = 0;
460 switch (entry->content) {
461 case SNDRV_INFO_CONTENT_DATA:
462 if (entry->c.ops->poll)
463 return entry->c.ops->poll(entry,
464 data->file_private_data,
465 file, wait);
466 if (entry->c.ops->read)
467 mask |= POLLIN | POLLRDNORM;
468 if (entry->c.ops->write)
469 mask |= POLLOUT | POLLWRNORM;
470 break;
471 }
472 return mask;
473}
474
475static long snd_info_entry_ioctl(struct file *file, unsigned int cmd,
476 unsigned long arg)
477{
478 struct snd_info_private_data *data;
479 struct snd_info_entry *entry;
480
481 data = file->private_data;
482 if (data == NULL)
483 return 0;
484 entry = data->entry;
485 switch (entry->content) {
486 case SNDRV_INFO_CONTENT_DATA:
487 if (entry->c.ops->ioctl)
488 return entry->c.ops->ioctl(entry,
489 data->file_private_data,
490 file, cmd, arg);
491 break;
492 }
493 return -ENOTTY;
494}
495
496static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma)
497{
498 struct inode *inode = file->f_path.dentry->d_inode;
499 struct snd_info_private_data *data;
500 struct snd_info_entry *entry;
501
502 data = file->private_data;
503 if (data == NULL)
504 return 0;
505 entry = data->entry;
506 switch (entry->content) {
507 case SNDRV_INFO_CONTENT_DATA:
508 if (entry->c.ops->mmap)
509 return entry->c.ops->mmap(entry,
510 data->file_private_data,
511 inode, file, vma);
512 break;
513 }
514 return -ENXIO;
515}
516
517static const struct file_operations snd_info_entry_operations =
518{
519 .owner = THIS_MODULE,
520 .llseek = snd_info_entry_llseek,
521 .read = snd_info_entry_read,
522 .write = snd_info_entry_write,
523 .poll = snd_info_entry_poll,
524 .unlocked_ioctl = snd_info_entry_ioctl,
525 .mmap = snd_info_entry_mmap,
526 .open = snd_info_entry_open,
527 .release = snd_info_entry_release,
528};
529
530int __init snd_info_init(void)
531{
532 struct proc_dir_entry *p;
533
534 p = proc_mkdir("asound", NULL);
535 if (p == NULL)
536 return -ENOMEM;
537 snd_proc_root = p;
538#ifdef CONFIG_SND_OSSEMUL
539 {
540 struct snd_info_entry *entry;
541 if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL)
542 return -ENOMEM;
543 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
544 if (snd_info_register(entry) < 0) {
545 snd_info_free_entry(entry);
546 return -ENOMEM;
547 }
548 snd_oss_root = entry;
549 }
550#endif
551#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
552 {
553 struct snd_info_entry *entry;
554 if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL)
555 return -ENOMEM;
556 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
557 if (snd_info_register(entry) < 0) {
558 snd_info_free_entry(entry);
559 return -ENOMEM;
560 }
561 snd_seq_root = entry;
562 }
563#endif
564 snd_info_version_init();
565 snd_minor_info_init();
566 snd_minor_info_oss_init();
567 snd_card_info_init();
568 return 0;
569}
570
571int __exit snd_info_done(void)
572{
573 snd_card_info_done();
574 snd_minor_info_oss_done();
575 snd_minor_info_done();
576 snd_info_version_done();
577 if (snd_proc_root) {
578#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
579 snd_info_free_entry(snd_seq_root);
580#endif
581#ifdef CONFIG_SND_OSSEMUL
582 snd_info_free_entry(snd_oss_root);
583#endif
584 snd_remove_proc_entry(NULL, snd_proc_root);
585 }
586 return 0;
587}
588
589/*
590
591 */
592
593
594/*
595 * create a card proc file
596 * called from init.c
597 */
598int snd_info_card_create(struct snd_card *card)
599{
600 char str[8];
601 struct snd_info_entry *entry;
602
603 if (snd_BUG_ON(!card))
604 return -ENXIO;
605
606 sprintf(str, "card%i", card->number);
607 if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL)
608 return -ENOMEM;
609 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
610 if (snd_info_register(entry) < 0) {
611 snd_info_free_entry(entry);
612 return -ENOMEM;
613 }
614 card->proc_root = entry;
615 return 0;
616}
617
618/*
619 * register the card proc file
620 * called from init.c
621 */
622int snd_info_card_register(struct snd_card *card)
623{
624 struct proc_dir_entry *p;
625
626 if (snd_BUG_ON(!card))
627 return -ENXIO;
628
629 if (!strcmp(card->id, card->proc_root->name))
630 return 0;
631
632 p = proc_symlink(card->id, snd_proc_root, card->proc_root->name);
633 if (p == NULL)
634 return -ENOMEM;
635 card->proc_root_link = p;
636 return 0;
637}
638
639/*
640 * called on card->id change
641 */
642void snd_info_card_id_change(struct snd_card *card)
643{
644 mutex_lock(&info_mutex);
645 if (card->proc_root_link) {
646 snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
647 card->proc_root_link = NULL;
648 }
649 if (strcmp(card->id, card->proc_root->name))
650 card->proc_root_link = proc_symlink(card->id,
651 snd_proc_root,
652 card->proc_root->name);
653 mutex_unlock(&info_mutex);
654}
655
656/*
657 * de-register the card proc file
658 * called from init.c
659 */
660void snd_info_card_disconnect(struct snd_card *card)
661{
662 if (!card)
663 return;
664 mutex_lock(&info_mutex);
665 if (card->proc_root_link) {
666 snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
667 card->proc_root_link = NULL;
668 }
669 if (card->proc_root)
670 snd_info_disconnect(card->proc_root);
671 mutex_unlock(&info_mutex);
672}
673
674/*
675 * release the card proc file resources
676 * called from init.c
677 */
678int snd_info_card_free(struct snd_card *card)
679{
680 if (!card)
681 return 0;
682 snd_info_free_entry(card->proc_root);
683 card->proc_root = NULL;
684 return 0;
685}
686
687
688/**
689 * snd_info_get_line - read one line from the procfs buffer
690 * @buffer: the procfs buffer
691 * @line: the buffer to store
692 * @len: the max. buffer size - 1
693 *
694 * Reads one line from the buffer and stores the string.
695 *
696 * Returns zero if successful, or 1 if error or EOF.
697 */
698int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len)
699{
700 int c = -1;
701
702 if (len <= 0 || buffer->stop || buffer->error)
703 return 1;
704 while (--len > 0) {
705 c = buffer->buffer[buffer->curr++];
706 if (c == '\n') {
707 if (buffer->curr >= buffer->size)
708 buffer->stop = 1;
709 break;
710 }
711 *line++ = c;
712 if (buffer->curr >= buffer->size) {
713 buffer->stop = 1;
714 break;
715 }
716 }
717 while (c != '\n' && !buffer->stop) {
718 c = buffer->buffer[buffer->curr++];
719 if (buffer->curr >= buffer->size)
720 buffer->stop = 1;
721 }
722 *line = '\0';
723 return 0;
724}
725
726EXPORT_SYMBOL(snd_info_get_line);
727
728/**
729 * snd_info_get_str - parse a string token
730 * @dest: the buffer to store the string token
731 * @src: the original string
732 * @len: the max. length of token - 1
733 *
734 * Parses the original string and copy a token to the given
735 * string buffer.
736 *
737 * Returns the updated pointer of the original string so that
738 * it can be used for the next call.
739 */
740const char *snd_info_get_str(char *dest, const char *src, int len)
741{
742 int c;
743
744 while (*src == ' ' || *src == '\t')
745 src++;
746 if (*src == '"' || *src == '\'') {
747 c = *src++;
748 while (--len > 0 && *src && *src != c) {
749 *dest++ = *src++;
750 }
751 if (*src == c)
752 src++;
753 } else {
754 while (--len > 0 && *src && *src != ' ' && *src != '\t') {
755 *dest++ = *src++;
756 }
757 }
758 *dest = 0;
759 while (*src == ' ' || *src == '\t')
760 src++;
761 return src;
762}
763
764EXPORT_SYMBOL(snd_info_get_str);
765
766/**
767 * snd_info_create_entry - create an info entry
768 * @name: the proc file name
769 *
770 * Creates an info entry with the given file name and initializes as
771 * the default state.
772 *
773 * Usually called from other functions such as
774 * snd_info_create_card_entry().
775 *
776 * Returns the pointer of the new instance, or NULL on failure.
777 */
778static struct snd_info_entry *snd_info_create_entry(const char *name)
779{
780 struct snd_info_entry *entry;
781 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
782 if (entry == NULL)
783 return NULL;
784 entry->name = kstrdup(name, GFP_KERNEL);
785 if (entry->name == NULL) {
786 kfree(entry);
787 return NULL;
788 }
789 entry->mode = S_IFREG | S_IRUGO;
790 entry->content = SNDRV_INFO_CONTENT_TEXT;
791 mutex_init(&entry->access);
792 INIT_LIST_HEAD(&entry->children);
793 INIT_LIST_HEAD(&entry->list);
794 return entry;
795}
796
797/**
798 * snd_info_create_module_entry - create an info entry for the given module
799 * @module: the module pointer
800 * @name: the file name
801 * @parent: the parent directory
802 *
803 * Creates a new info entry and assigns it to the given module.
804 *
805 * Returns the pointer of the new instance, or NULL on failure.
806 */
807struct snd_info_entry *snd_info_create_module_entry(struct module * module,
808 const char *name,
809 struct snd_info_entry *parent)
810{
811 struct snd_info_entry *entry = snd_info_create_entry(name);
812 if (entry) {
813 entry->module = module;
814 entry->parent = parent;
815 }
816 return entry;
817}
818
819EXPORT_SYMBOL(snd_info_create_module_entry);
820
821/**
822 * snd_info_create_card_entry - create an info entry for the given card
823 * @card: the card instance
824 * @name: the file name
825 * @parent: the parent directory
826 *
827 * Creates a new info entry and assigns it to the given card.
828 *
829 * Returns the pointer of the new instance, or NULL on failure.
830 */
831struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
832 const char *name,
833 struct snd_info_entry * parent)
834{
835 struct snd_info_entry *entry = snd_info_create_entry(name);
836 if (entry) {
837 entry->module = card->module;
838 entry->card = card;
839 entry->parent = parent;
840 }
841 return entry;
842}
843
844EXPORT_SYMBOL(snd_info_create_card_entry);
845
846static void snd_info_disconnect(struct snd_info_entry *entry)
847{
848 struct list_head *p, *n;
849 struct proc_dir_entry *root;
850
851 list_for_each_safe(p, n, &entry->children) {
852 snd_info_disconnect(list_entry(p, struct snd_info_entry, list));
853 }
854
855 if (! entry->p)
856 return;
857 list_del_init(&entry->list);
858 root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
859 snd_BUG_ON(!root);
860 snd_remove_proc_entry(root, entry->p);
861 entry->p = NULL;
862}
863
864static int snd_info_dev_free_entry(struct snd_device *device)
865{
866 struct snd_info_entry *entry = device->device_data;
867 snd_info_free_entry(entry);
868 return 0;
869}
870
871static int snd_info_dev_register_entry(struct snd_device *device)
872{
873 struct snd_info_entry *entry = device->device_data;
874 return snd_info_register(entry);
875}
876
877/**
878 * snd_card_proc_new - create an info entry for the given card
879 * @card: the card instance
880 * @name: the file name
881 * @entryp: the pointer to store the new info entry
882 *
883 * Creates a new info entry and assigns it to the given card.
884 * Unlike snd_info_create_card_entry(), this function registers the
885 * info entry as an ALSA device component, so that it can be
886 * unregistered/released without explicit call.
887 * Also, you don't have to register this entry via snd_info_register(),
888 * since this will be registered by snd_card_register() automatically.
889 *
890 * The parent is assumed as card->proc_root.
891 *
892 * For releasing this entry, use snd_device_free() instead of
893 * snd_info_free_entry().
894 *
895 * Returns zero if successful, or a negative error code on failure.
896 */
897int snd_card_proc_new(struct snd_card *card, const char *name,
898 struct snd_info_entry **entryp)
899{
900 static struct snd_device_ops ops = {
901 .dev_free = snd_info_dev_free_entry,
902 .dev_register = snd_info_dev_register_entry,
903 /* disconnect is done via snd_info_card_disconnect() */
904 };
905 struct snd_info_entry *entry;
906 int err;
907
908 entry = snd_info_create_card_entry(card, name, card->proc_root);
909 if (! entry)
910 return -ENOMEM;
911 if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) {
912 snd_info_free_entry(entry);
913 return err;
914 }
915 if (entryp)
916 *entryp = entry;
917 return 0;
918}
919
920EXPORT_SYMBOL(snd_card_proc_new);
921
922/**
923 * snd_info_free_entry - release the info entry
924 * @entry: the info entry
925 *
926 * Releases the info entry. Don't call this after registered.
927 */
928void snd_info_free_entry(struct snd_info_entry * entry)
929{
930 if (entry == NULL)
931 return;
932 if (entry->p) {
933 mutex_lock(&info_mutex);
934 snd_info_disconnect(entry);
935 mutex_unlock(&info_mutex);
936 }
937 kfree(entry->name);
938 if (entry->private_free)
939 entry->private_free(entry);
940 kfree(entry);
941}
942
943EXPORT_SYMBOL(snd_info_free_entry);
944
945/**
946 * snd_info_register - register the info entry
947 * @entry: the info entry
948 *
949 * Registers the proc info entry.
950 *
951 * Returns zero if successful, or a negative error code on failure.
952 */
953int snd_info_register(struct snd_info_entry * entry)
954{
955 struct proc_dir_entry *root, *p = NULL;
956
957 if (snd_BUG_ON(!entry))
958 return -ENXIO;
959 root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
960 mutex_lock(&info_mutex);
961 p = create_proc_entry(entry->name, entry->mode, root);
962 if (!p) {
963 mutex_unlock(&info_mutex);
964 return -ENOMEM;
965 }
966 if (!S_ISDIR(entry->mode))
967 p->proc_fops = &snd_info_entry_operations;
968 p->size = entry->size;
969 p->data = entry;
970 entry->p = p;
971 if (entry->parent)
972 list_add_tail(&entry->list, &entry->parent->children);
973 mutex_unlock(&info_mutex);
974 return 0;
975}
976
977EXPORT_SYMBOL(snd_info_register);
978
979/*
980
981 */
982
983static struct snd_info_entry *snd_info_version_entry;
984
985static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
986{
987 snd_iprintf(buffer,
988 "Advanced Linux Sound Architecture Driver Version "
989 CONFIG_SND_VERSION CONFIG_SND_DATE ".\n"
990 );
991}
992
993static int __init snd_info_version_init(void)
994{
995 struct snd_info_entry *entry;
996
997 entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL);
998 if (entry == NULL)
999 return -ENOMEM;
1000 entry->c.text.read = snd_info_version_read;
1001 if (snd_info_register(entry) < 0) {
1002 snd_info_free_entry(entry);
1003 return -ENOMEM;
1004 }
1005 snd_info_version_entry = entry;
1006 return 0;
1007}
1008
1009static int __exit snd_info_version_done(void)
1010{
1011 snd_info_free_entry(snd_info_version_entry);
1012 return 0;
1013}
1014
1015#endif /* CONFIG_PROC_FS */
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
36int 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
65static DEFINE_MUTEX(info_mutex);
66
67struct 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
74static int snd_info_version_init(void);
75static void snd_info_disconnect(struct snd_info_entry *entry);
76
77/*
78
79 */
80
81static struct snd_info_entry *snd_proc_root;
82struct snd_info_entry *snd_seq_root;
83EXPORT_SYMBOL(snd_seq_root);
84
85#ifdef CONFIG_SND_OSSEMUL
86struct snd_info_entry *snd_oss_root;
87#endif
88
89static 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
108static 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 */
120static 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
162static 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
184static 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
206static 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
223static 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
235static 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
251static 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
287static 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
300static 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 */
316static 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 pos = *offset;
329 if (!valid_pos(pos, count))
330 return -EIO;
331 next = pos + count;
332 mutex_lock(&entry->access);
333 buf = data->wbuffer;
334 if (!buf) {
335 data->wbuffer = buf = kzalloc(sizeof(*buf), GFP_KERNEL);
336 if (!buf) {
337 err = -ENOMEM;
338 goto error;
339 }
340 }
341 if (next > buf->len) {
342 char *nbuf = krealloc(buf->buffer, PAGE_ALIGN(next),
343 GFP_KERNEL | __GFP_ZERO);
344 if (!nbuf) {
345 err = -ENOMEM;
346 goto error;
347 }
348 buf->buffer = nbuf;
349 buf->len = PAGE_ALIGN(next);
350 }
351 if (copy_from_user(buf->buffer + pos, buffer, count)) {
352 err = -EFAULT;
353 goto error;
354 }
355 buf->size = next;
356 error:
357 mutex_unlock(&entry->access);
358 if (err < 0)
359 return err;
360 *offset = next;
361 return count;
362}
363
364static int snd_info_seq_show(struct seq_file *seq, void *p)
365{
366 struct snd_info_private_data *data = seq->private;
367 struct snd_info_entry *entry = data->entry;
368
369 if (entry->c.text.read) {
370 data->rbuffer->buffer = (char *)seq; /* XXX hack! */
371 entry->c.text.read(entry, data->rbuffer);
372 }
373 return 0;
374}
375
376static int snd_info_text_entry_open(struct inode *inode, struct file *file)
377{
378 struct snd_info_entry *entry = PDE_DATA(inode);
379 struct snd_info_private_data *data;
380 int err;
381
382 mutex_lock(&info_mutex);
383 err = alloc_info_private(entry, &data);
384 if (err < 0)
385 goto unlock;
386
387 data->rbuffer = kzalloc(sizeof(*data->rbuffer), GFP_KERNEL);
388 if (!data->rbuffer) {
389 err = -ENOMEM;
390 goto error;
391 }
392 if (entry->size)
393 err = single_open_size(file, snd_info_seq_show, data,
394 entry->size);
395 else
396 err = single_open(file, snd_info_seq_show, data);
397 if (err < 0)
398 goto error;
399 mutex_unlock(&info_mutex);
400 return 0;
401
402 error:
403 kfree(data->rbuffer);
404 kfree(data);
405 module_put(entry->module);
406 unlock:
407 mutex_unlock(&info_mutex);
408 return err;
409}
410
411static int snd_info_text_entry_release(struct inode *inode, struct file *file)
412{
413 struct seq_file *m = file->private_data;
414 struct snd_info_private_data *data = m->private;
415 struct snd_info_entry *entry = data->entry;
416
417 if (data->wbuffer && entry->c.text.write)
418 entry->c.text.write(entry, data->wbuffer);
419
420 single_release(inode, file);
421 kfree(data->rbuffer);
422 if (data->wbuffer) {
423 kfree(data->wbuffer->buffer);
424 kfree(data->wbuffer);
425 }
426
427 module_put(entry->module);
428 kfree(data);
429 return 0;
430}
431
432static const struct file_operations snd_info_text_entry_ops =
433{
434 .owner = THIS_MODULE,
435 .open = snd_info_text_entry_open,
436 .release = snd_info_text_entry_release,
437 .write = snd_info_text_entry_write,
438 .llseek = seq_lseek,
439 .read = seq_read,
440};
441
442static struct snd_info_entry *create_subdir(struct module *mod,
443 const char *name)
444{
445 struct snd_info_entry *entry;
446
447 entry = snd_info_create_module_entry(mod, name, NULL);
448 if (!entry)
449 return NULL;
450 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
451 if (snd_info_register(entry) < 0) {
452 snd_info_free_entry(entry);
453 return NULL;
454 }
455 return entry;
456}
457
458static struct snd_info_entry *
459snd_info_create_entry(const char *name, struct snd_info_entry *parent);
460
461int __init snd_info_init(void)
462{
463 snd_proc_root = snd_info_create_entry("asound", NULL);
464 if (!snd_proc_root)
465 return -ENOMEM;
466 snd_proc_root->mode = S_IFDIR | S_IRUGO | S_IXUGO;
467 snd_proc_root->p = proc_mkdir("asound", NULL);
468 if (!snd_proc_root->p)
469 goto error;
470#ifdef CONFIG_SND_OSSEMUL
471 snd_oss_root = create_subdir(THIS_MODULE, "oss");
472 if (!snd_oss_root)
473 goto error;
474#endif
475#if IS_ENABLED(CONFIG_SND_SEQUENCER)
476 snd_seq_root = create_subdir(THIS_MODULE, "seq");
477 if (!snd_seq_root)
478 goto error;
479#endif
480 if (snd_info_version_init() < 0 ||
481 snd_minor_info_init() < 0 ||
482 snd_minor_info_oss_init() < 0 ||
483 snd_card_info_init() < 0 ||
484 snd_info_minor_register() < 0)
485 goto error;
486 return 0;
487
488 error:
489 snd_info_free_entry(snd_proc_root);
490 return -ENOMEM;
491}
492
493int __exit snd_info_done(void)
494{
495 snd_info_free_entry(snd_proc_root);
496 return 0;
497}
498
499/*
500 * create a card proc file
501 * called from init.c
502 */
503int snd_info_card_create(struct snd_card *card)
504{
505 char str[8];
506 struct snd_info_entry *entry;
507
508 if (snd_BUG_ON(!card))
509 return -ENXIO;
510
511 sprintf(str, "card%i", card->number);
512 entry = create_subdir(card->module, str);
513 if (!entry)
514 return -ENOMEM;
515 card->proc_root = entry;
516 return 0;
517}
518
519/* register all pending info entries */
520static int snd_info_register_recursive(struct snd_info_entry *entry)
521{
522 struct snd_info_entry *p;
523 int err;
524
525 if (!entry->p) {
526 err = snd_info_register(entry);
527 if (err < 0)
528 return err;
529 }
530
531 list_for_each_entry(p, &entry->children, list) {
532 err = snd_info_register_recursive(p);
533 if (err < 0)
534 return err;
535 }
536
537 return 0;
538}
539
540/*
541 * register the card proc file
542 * called from init.c
543 * can be called multiple times for reinitialization
544 */
545int snd_info_card_register(struct snd_card *card)
546{
547 struct proc_dir_entry *p;
548 int err;
549
550 if (snd_BUG_ON(!card))
551 return -ENXIO;
552
553 err = snd_info_register_recursive(card->proc_root);
554 if (err < 0)
555 return err;
556
557 if (!strcmp(card->id, card->proc_root->name))
558 return 0;
559
560 if (card->proc_root_link)
561 return 0;
562 p = proc_symlink(card->id, snd_proc_root->p, card->proc_root->name);
563 if (!p)
564 return -ENOMEM;
565 card->proc_root_link = p;
566 return 0;
567}
568
569/*
570 * called on card->id change
571 */
572void snd_info_card_id_change(struct snd_card *card)
573{
574 mutex_lock(&info_mutex);
575 if (card->proc_root_link) {
576 proc_remove(card->proc_root_link);
577 card->proc_root_link = NULL;
578 }
579 if (strcmp(card->id, card->proc_root->name))
580 card->proc_root_link = proc_symlink(card->id,
581 snd_proc_root->p,
582 card->proc_root->name);
583 mutex_unlock(&info_mutex);
584}
585
586/*
587 * de-register the card proc file
588 * called from init.c
589 */
590void snd_info_card_disconnect(struct snd_card *card)
591{
592 if (!card)
593 return;
594 mutex_lock(&info_mutex);
595 proc_remove(card->proc_root_link);
596 card->proc_root_link = NULL;
597 if (card->proc_root)
598 snd_info_disconnect(card->proc_root);
599 mutex_unlock(&info_mutex);
600}
601
602/*
603 * release the card proc file resources
604 * called from init.c
605 */
606int snd_info_card_free(struct snd_card *card)
607{
608 if (!card)
609 return 0;
610 snd_info_free_entry(card->proc_root);
611 card->proc_root = NULL;
612 return 0;
613}
614
615
616/**
617 * snd_info_get_line - read one line from the procfs buffer
618 * @buffer: the procfs buffer
619 * @line: the buffer to store
620 * @len: the max. buffer size
621 *
622 * Reads one line from the buffer and stores the string.
623 *
624 * Return: Zero if successful, or 1 if error or EOF.
625 */
626int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len)
627{
628 int c = -1;
629
630 if (snd_BUG_ON(!buffer || !buffer->buffer))
631 return 1;
632 if (len <= 0 || buffer->stop || buffer->error)
633 return 1;
634 while (!buffer->stop) {
635 c = buffer->buffer[buffer->curr++];
636 if (buffer->curr >= buffer->size)
637 buffer->stop = 1;
638 if (c == '\n')
639 break;
640 if (len > 1) {
641 len--;
642 *line++ = c;
643 }
644 }
645 *line = '\0';
646 return 0;
647}
648
649EXPORT_SYMBOL(snd_info_get_line);
650
651/**
652 * snd_info_get_str - parse a string token
653 * @dest: the buffer to store the string token
654 * @src: the original string
655 * @len: the max. length of token - 1
656 *
657 * Parses the original string and copy a token to the given
658 * string buffer.
659 *
660 * Return: The updated pointer of the original string so that
661 * it can be used for the next call.
662 */
663const char *snd_info_get_str(char *dest, const char *src, int len)
664{
665 int c;
666
667 while (*src == ' ' || *src == '\t')
668 src++;
669 if (*src == '"' || *src == '\'') {
670 c = *src++;
671 while (--len > 0 && *src && *src != c) {
672 *dest++ = *src++;
673 }
674 if (*src == c)
675 src++;
676 } else {
677 while (--len > 0 && *src && *src != ' ' && *src != '\t') {
678 *dest++ = *src++;
679 }
680 }
681 *dest = 0;
682 while (*src == ' ' || *src == '\t')
683 src++;
684 return src;
685}
686
687EXPORT_SYMBOL(snd_info_get_str);
688
689/*
690 * snd_info_create_entry - create an info entry
691 * @name: the proc file name
692 * @parent: the parent directory
693 *
694 * Creates an info entry with the given file name and initializes as
695 * the default state.
696 *
697 * Usually called from other functions such as
698 * snd_info_create_card_entry().
699 *
700 * Return: The pointer of the new instance, or %NULL on failure.
701 */
702static struct snd_info_entry *
703snd_info_create_entry(const char *name, struct snd_info_entry *parent)
704{
705 struct snd_info_entry *entry;
706 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
707 if (entry == NULL)
708 return NULL;
709 entry->name = kstrdup(name, GFP_KERNEL);
710 if (entry->name == NULL) {
711 kfree(entry);
712 return NULL;
713 }
714 entry->mode = S_IFREG | S_IRUGO;
715 entry->content = SNDRV_INFO_CONTENT_TEXT;
716 mutex_init(&entry->access);
717 INIT_LIST_HEAD(&entry->children);
718 INIT_LIST_HEAD(&entry->list);
719 entry->parent = parent;
720 if (parent)
721 list_add_tail(&entry->list, &parent->children);
722 return entry;
723}
724
725/**
726 * snd_info_create_module_entry - create an info entry for the given module
727 * @module: the module pointer
728 * @name: the file name
729 * @parent: the parent directory
730 *
731 * Creates a new info entry and assigns it to the given module.
732 *
733 * Return: The pointer of the new instance, or %NULL on failure.
734 */
735struct snd_info_entry *snd_info_create_module_entry(struct module * module,
736 const char *name,
737 struct snd_info_entry *parent)
738{
739 struct snd_info_entry *entry = snd_info_create_entry(name, parent);
740 if (entry)
741 entry->module = module;
742 return entry;
743}
744
745EXPORT_SYMBOL(snd_info_create_module_entry);
746
747/**
748 * snd_info_create_card_entry - create an info entry for the given card
749 * @card: the card instance
750 * @name: the file name
751 * @parent: the parent directory
752 *
753 * Creates a new info entry and assigns it to the given card.
754 *
755 * Return: The pointer of the new instance, or %NULL on failure.
756 */
757struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
758 const char *name,
759 struct snd_info_entry * parent)
760{
761 struct snd_info_entry *entry = snd_info_create_entry(name, parent);
762 if (entry) {
763 entry->module = card->module;
764 entry->card = card;
765 }
766 return entry;
767}
768
769EXPORT_SYMBOL(snd_info_create_card_entry);
770
771static void snd_info_disconnect(struct snd_info_entry *entry)
772{
773 struct snd_info_entry *p;
774
775 if (!entry->p)
776 return;
777 list_for_each_entry(p, &entry->children, list)
778 snd_info_disconnect(p);
779 proc_remove(entry->p);
780 entry->p = NULL;
781}
782
783/**
784 * snd_info_free_entry - release the info entry
785 * @entry: the info entry
786 *
787 * Releases the info entry.
788 */
789void snd_info_free_entry(struct snd_info_entry * entry)
790{
791 struct snd_info_entry *p, *n;
792
793 if (!entry)
794 return;
795 if (entry->p) {
796 mutex_lock(&info_mutex);
797 snd_info_disconnect(entry);
798 mutex_unlock(&info_mutex);
799 }
800
801 /* free all children at first */
802 list_for_each_entry_safe(p, n, &entry->children, list)
803 snd_info_free_entry(p);
804
805 list_del(&entry->list);
806 kfree(entry->name);
807 if (entry->private_free)
808 entry->private_free(entry);
809 kfree(entry);
810}
811
812EXPORT_SYMBOL(snd_info_free_entry);
813
814/**
815 * snd_info_register - register the info entry
816 * @entry: the info entry
817 *
818 * Registers the proc info entry.
819 *
820 * Return: Zero if successful, or a negative error code on failure.
821 */
822int snd_info_register(struct snd_info_entry * entry)
823{
824 struct proc_dir_entry *root, *p = NULL;
825
826 if (snd_BUG_ON(!entry))
827 return -ENXIO;
828 root = entry->parent == NULL ? snd_proc_root->p : entry->parent->p;
829 mutex_lock(&info_mutex);
830 if (S_ISDIR(entry->mode)) {
831 p = proc_mkdir_mode(entry->name, entry->mode, root);
832 if (!p) {
833 mutex_unlock(&info_mutex);
834 return -ENOMEM;
835 }
836 } else {
837 const struct file_operations *ops;
838 if (entry->content == SNDRV_INFO_CONTENT_DATA)
839 ops = &snd_info_entry_operations;
840 else
841 ops = &snd_info_text_entry_ops;
842 p = proc_create_data(entry->name, entry->mode, root,
843 ops, entry);
844 if (!p) {
845 mutex_unlock(&info_mutex);
846 return -ENOMEM;
847 }
848 proc_set_size(p, entry->size);
849 }
850 entry->p = p;
851 mutex_unlock(&info_mutex);
852 return 0;
853}
854
855EXPORT_SYMBOL(snd_info_register);
856
857/*
858
859 */
860
861static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
862{
863 snd_iprintf(buffer,
864 "Advanced Linux Sound Architecture Driver Version k%s.\n",
865 init_utsname()->release);
866}
867
868static int __init snd_info_version_init(void)
869{
870 struct snd_info_entry *entry;
871
872 entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL);
873 if (entry == NULL)
874 return -ENOMEM;
875 entry->c.text.read = snd_info_version_read;
876 return snd_info_register(entry); /* freed in error path */
877}