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Linux 3.11-rc2
[linux-2.6.git] / sound / core / info.c
blobe79baa11b60eb15526ba3679537720b2f29d0de6
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 snd_printk(KERN_WARNING "data write error to %s (%i)\n",
422 entry->name,
423 data->wbuffer->error);
424 }
425 }
426 kfree(data->wbuffer->buffer);
427 kfree(data->wbuffer);
428 }
429 break;
430 case SNDRV_INFO_CONTENT_DATA:
431 if (entry->c.ops->release)
432 entry->c.ops->release(entry, mode,
433 data->file_private_data);
434 break;
435 }
436 module_put(entry->module);
437 kfree(data);
438 return 0;
439 }
440
441 static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait)
442 {
443 struct snd_info_private_data *data;
444 struct snd_info_entry *entry;
445 unsigned int mask;
446
447 data = file->private_data;
448 if (data == NULL)
449 return 0;
450 entry = data->entry;
451 mask = 0;
452 switch (entry->content) {
453 case SNDRV_INFO_CONTENT_DATA:
454 if (entry->c.ops->poll)
455 return entry->c.ops->poll(entry,
456 data->file_private_data,
457 file, wait);
458 if (entry->c.ops->read)
459 mask |= POLLIN | POLLRDNORM;
460 if (entry->c.ops->write)
461 mask |= POLLOUT | POLLWRNORM;
462 break;
463 }
464 return mask;
465 }
466
467 static long snd_info_entry_ioctl(struct file *file, unsigned int cmd,
468 unsigned long arg)
469 {
470 struct snd_info_private_data *data;
471 struct snd_info_entry *entry;
472
473 data = file->private_data;
474 if (data == NULL)
475 return 0;
476 entry = data->entry;
477 switch (entry->content) {
478 case SNDRV_INFO_CONTENT_DATA:
479 if (entry->c.ops->ioctl)
480 return entry->c.ops->ioctl(entry,
481 data->file_private_data,
482 file, cmd, arg);
483 break;
484 }
485 return -ENOTTY;
486 }
487
488 static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma)
489 {
490 struct inode *inode = file_inode(file);
491 struct snd_info_private_data *data;
492 struct snd_info_entry *entry;
493
494 data = file->private_data;
495 if (data == NULL)
496 return 0;
497 entry = data->entry;
498 switch (entry->content) {
499 case SNDRV_INFO_CONTENT_DATA:
500 if (entry->c.ops->mmap)
501 return entry->c.ops->mmap(entry,
502 data->file_private_data,
503 inode, file, vma);
504 break;
505 }
506 return -ENXIO;
507 }
508
509 static const struct file_operations snd_info_entry_operations =
510 {
511 .owner = THIS_MODULE,
512 .llseek = snd_info_entry_llseek,
513 .read = snd_info_entry_read,
514 .write = snd_info_entry_write,
515 .poll = snd_info_entry_poll,
516 .unlocked_ioctl = snd_info_entry_ioctl,
517 .mmap = snd_info_entry_mmap,
518 .open = snd_info_entry_open,
519 .release = snd_info_entry_release,
520 };
521
522 int __init snd_info_init(void)
523 {
524 struct proc_dir_entry *p;
525
526 p = proc_mkdir("asound", NULL);
527 if (p == NULL)
528 return -ENOMEM;
529 snd_proc_root = p;
530 #ifdef CONFIG_SND_OSSEMUL
531 {
532 struct snd_info_entry *entry;
533 if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL)
534 return -ENOMEM;
535 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
536 if (snd_info_register(entry) < 0) {
537 snd_info_free_entry(entry);
538 return -ENOMEM;
539 }
540 snd_oss_root = entry;
541 }
542 #endif
543 #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
544 {
545 struct snd_info_entry *entry;
546 if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL)
547 return -ENOMEM;
548 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
549 if (snd_info_register(entry) < 0) {
550 snd_info_free_entry(entry);
551 return -ENOMEM;
552 }
553 snd_seq_root = entry;
554 }
555 #endif
556 snd_info_version_init();
557 snd_minor_info_init();
558 snd_minor_info_oss_init();
559 snd_card_info_init();
560 return 0;
561 }
562
563 int __exit snd_info_done(void)
564 {
565 snd_card_info_done();
566 snd_minor_info_oss_done();
567 snd_minor_info_done();
568 snd_info_version_done();
569 if (snd_proc_root) {
570 #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
571 snd_info_free_entry(snd_seq_root);
572 #endif
573 #ifdef CONFIG_SND_OSSEMUL
574 snd_info_free_entry(snd_oss_root);
575 #endif
576 proc_remove(snd_proc_root);
577 }
578 return 0;
579 }
580
581 /*
582
583 */
584
585
586 /*
587 * create a card proc file
588 * called from init.c
589 */
590 int snd_info_card_create(struct snd_card *card)
591 {
592 char str[8];
593 struct snd_info_entry *entry;
594
595 if (snd_BUG_ON(!card))
596 return -ENXIO;
597
598 sprintf(str, "card%i", card->number);
599 if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL)
600 return -ENOMEM;
601 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
602 if (snd_info_register(entry) < 0) {
603 snd_info_free_entry(entry);
604 return -ENOMEM;
605 }
606 card->proc_root = entry;
607 return 0;
608 }
609
610 /*
611 * register the card proc file
612 * called from init.c
613 */
614 int snd_info_card_register(struct snd_card *card)
615 {
616 struct proc_dir_entry *p;
617
618 if (snd_BUG_ON(!card))
619 return -ENXIO;
620
621 if (!strcmp(card->id, card->proc_root->name))
622 return 0;
623
624 p = proc_symlink(card->id, snd_proc_root, card->proc_root->name);
625 if (p == NULL)
626 return -ENOMEM;
627 card->proc_root_link = p;
628 return 0;
629 }
630
631 /*
632 * called on card->id change
633 */
634 void snd_info_card_id_change(struct snd_card *card)
635 {
636 mutex_lock(&info_mutex);
637 if (card->proc_root_link) {
638 proc_remove(card->proc_root_link);
639 card->proc_root_link = NULL;
640 }
641 if (strcmp(card->id, card->proc_root->name))
642 card->proc_root_link = proc_symlink(card->id,
643 snd_proc_root,
644 card->proc_root->name);
645 mutex_unlock(&info_mutex);
646 }
647
648 /*
649 * de-register the card proc file
650 * called from init.c
651 */
652 void snd_info_card_disconnect(struct snd_card *card)
653 {
654 if (!card)
655 return;
656 mutex_lock(&info_mutex);
657 proc_remove(card->proc_root_link);
658 card->proc_root_link = NULL;
659 if (card->proc_root)
660 snd_info_disconnect(card->proc_root);
661 mutex_unlock(&info_mutex);
662 }
663
664 /*
665 * release the card proc file resources
666 * called from init.c
667 */
668 int snd_info_card_free(struct snd_card *card)
669 {
670 if (!card)
671 return 0;
672 snd_info_free_entry(card->proc_root);
673 card->proc_root = NULL;
674 return 0;
675 }
676
677
678 /**
679 * snd_info_get_line - read one line from the procfs buffer
680 * @buffer: the procfs buffer
681 * @line: the buffer to store
682 * @len: the max. buffer size - 1
683 *
684 * Reads one line from the buffer and stores the string.
685 *
686 * Return: Zero if successful, or 1 if error or EOF.
687 */
688 int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len)
689 {
690 int c = -1;
691
692 if (snd_BUG_ON(!buffer || !buffer->buffer))
693 return 1;
694 if (len <= 0 || buffer->stop || buffer->error)
695 return 1;
696 while (!buffer->stop) {
697 c = buffer->buffer[buffer->curr++];
698 if (buffer->curr >= buffer->size)
699 buffer->stop = 1;
700 if (c == '\n')
701 break;
702 if (len) {
703 len--;
704 *line++ = c;
705 }
706 }
707 *line = '\0';
708 return 0;
709 }
710
711 EXPORT_SYMBOL(snd_info_get_line);
712
713 /**
714 * snd_info_get_str - parse a string token
715 * @dest: the buffer to store the string token
716 * @src: the original string
717 * @len: the max. length of token - 1
718 *
719 * Parses the original string and copy a token to the given
720 * string buffer.
721 *
722 * Return: The updated pointer of the original string so that
723 * it can be used for the next call.
724 */
725 const char *snd_info_get_str(char *dest, const char *src, int len)
726 {
727 int c;
728
729 while (*src == ' ' || *src == '\t')
730 src++;
731 if (*src == '"' || *src == '\'') {
732 c = *src++;
733 while (--len > 0 && *src && *src != c) {
734 *dest++ = *src++;
735 }
736 if (*src == c)
737 src++;
738 } else {
739 while (--len > 0 && *src && *src != ' ' && *src != '\t') {
740 *dest++ = *src++;
741 }
742 }
743 *dest = 0;
744 while (*src == ' ' || *src == '\t')
745 src++;
746 return src;
747 }
748
749 EXPORT_SYMBOL(snd_info_get_str);
750
751 /**
752 * snd_info_create_entry - create an info entry
753 * @name: the proc file name
754 *
755 * Creates an info entry with the given file name and initializes as
756 * the default state.
757 *
758 * Usually called from other functions such as
759 * snd_info_create_card_entry().
760 *
761 * Return: The pointer of the new instance, or %NULL on failure.
762 */
763 static struct snd_info_entry *snd_info_create_entry(const char *name)
764 {
765 struct snd_info_entry *entry;
766 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
767 if (entry == NULL)
768 return NULL;
769 entry->name = kstrdup(name, GFP_KERNEL);
770 if (entry->name == NULL) {
771 kfree(entry);
772 return NULL;
773 }
774 entry->mode = S_IFREG | S_IRUGO;
775 entry->content = SNDRV_INFO_CONTENT_TEXT;
776 mutex_init(&entry->access);
777 INIT_LIST_HEAD(&entry->children);
778 INIT_LIST_HEAD(&entry->list);
779 return entry;
780 }
781
782 /**
783 * snd_info_create_module_entry - create an info entry for the given module
784 * @module: the module pointer
785 * @name: the file name
786 * @parent: the parent directory
787 *
788 * Creates a new info entry and assigns it to the given module.
789 *
790 * Return: The pointer of the new instance, or %NULL on failure.
791 */
792 struct snd_info_entry *snd_info_create_module_entry(struct module * module,
793 const char *name,
794 struct snd_info_entry *parent)
795 {
796 struct snd_info_entry *entry = snd_info_create_entry(name);
797 if (entry) {
798 entry->module = module;
799 entry->parent = parent;
800 }
801 return entry;
802 }
803
804 EXPORT_SYMBOL(snd_info_create_module_entry);
805
806 /**
807 * snd_info_create_card_entry - create an info entry for the given card
808 * @card: the card instance
809 * @name: the file name
810 * @parent: the parent directory
811 *
812 * Creates a new info entry and assigns it to the given card.
813 *
814 * Return: The pointer of the new instance, or %NULL on failure.
815 */
816 struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
817 const char *name,
818 struct snd_info_entry * parent)
819 {
820 struct snd_info_entry *entry = snd_info_create_entry(name);
821 if (entry) {
822 entry->module = card->module;
823 entry->card = card;
824 entry->parent = parent;
825 }
826 return entry;
827 }
828
829 EXPORT_SYMBOL(snd_info_create_card_entry);
830
831 static void snd_info_disconnect(struct snd_info_entry *entry)
832 {
833 struct list_head *p, *n;
834 struct proc_dir_entry *root;
835
836 list_for_each_safe(p, n, &entry->children) {
837 snd_info_disconnect(list_entry(p, struct snd_info_entry, list));
838 }
839
840 if (! entry->p)
841 return;
842 list_del_init(&entry->list);
843 root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
844 snd_BUG_ON(!root);
845 proc_remove(entry->p);
846 entry->p = NULL;
847 }
848
849 static int snd_info_dev_free_entry(struct snd_device *device)
850 {
851 struct snd_info_entry *entry = device->device_data;
852 snd_info_free_entry(entry);
853 return 0;
854 }
855
856 static int snd_info_dev_register_entry(struct snd_device *device)
857 {
858 struct snd_info_entry *entry = device->device_data;
859 return snd_info_register(entry);
860 }
861
862 /**
863 * snd_card_proc_new - create an info entry for the given card
864 * @card: the card instance
865 * @name: the file name
866 * @entryp: the pointer to store the new info entry
867 *
868 * Creates a new info entry and assigns it to the given card.
869 * Unlike snd_info_create_card_entry(), this function registers the
870 * info entry as an ALSA device component, so that it can be
871 * unregistered/released without explicit call.
872 * Also, you don't have to register this entry via snd_info_register(),
873 * since this will be registered by snd_card_register() automatically.
874 *
875 * The parent is assumed as card->proc_root.
876 *
877 * For releasing this entry, use snd_device_free() instead of
878 * snd_info_free_entry().
879 *
880 * Return: Zero if successful, or a negative error code on failure.
881 */
882 int snd_card_proc_new(struct snd_card *card, const char *name,
883 struct snd_info_entry **entryp)
884 {
885 static struct snd_device_ops ops = {
886 .dev_free = snd_info_dev_free_entry,
887 .dev_register = snd_info_dev_register_entry,
888 /* disconnect is done via snd_info_card_disconnect() */
889 };
890 struct snd_info_entry *entry;
891 int err;
892
893 entry = snd_info_create_card_entry(card, name, card->proc_root);
894 if (! entry)
895 return -ENOMEM;
896 if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) {
897 snd_info_free_entry(entry);
898 return err;
899 }
900 if (entryp)
901 *entryp = entry;
902 return 0;
903 }
904
905 EXPORT_SYMBOL(snd_card_proc_new);
906
907 /**
908 * snd_info_free_entry - release the info entry
909 * @entry: the info entry
910 *
911 * Releases the info entry. Don't call this after registered.
912 */
913 void snd_info_free_entry(struct snd_info_entry * entry)
914 {
915 if (entry == NULL)
916 return;
917 if (entry->p) {
918 mutex_lock(&info_mutex);
919 snd_info_disconnect(entry);
920 mutex_unlock(&info_mutex);
921 }
922 kfree(entry->name);
923 if (entry->private_free)
924 entry->private_free(entry);
925 kfree(entry);
926 }
927
928 EXPORT_SYMBOL(snd_info_free_entry);
929
930 /**
931 * snd_info_register - register the info entry
932 * @entry: the info entry
933 *
934 * Registers the proc info entry.
935 *
936 * Return: Zero if successful, or a negative error code on failure.
937 */
938 int snd_info_register(struct snd_info_entry * entry)
939 {
940 struct proc_dir_entry *root, *p = NULL;
941
942 if (snd_BUG_ON(!entry))
943 return -ENXIO;
944 root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
945 mutex_lock(&info_mutex);
946 if (S_ISDIR(entry->mode)) {
947 p = proc_mkdir_mode(entry->name, entry->mode, root);
948 if (!p) {
949 mutex_unlock(&info_mutex);
950 return -ENOMEM;
951 }
952 } else {
953 p = proc_create_data(entry->name, entry->mode, root,
954 &snd_info_entry_operations, entry);
955 if (!p) {
956 mutex_unlock(&info_mutex);
957 return -ENOMEM;
958 }
959 proc_set_size(p, entry->size);
960 }
961 entry->p = p;
962 if (entry->parent)
963 list_add_tail(&entry->list, &entry->parent->children);
964 mutex_unlock(&info_mutex);
965 return 0;
966 }
967
968 EXPORT_SYMBOL(snd_info_register);
969
970 /*
971
972 */
973
974 static struct snd_info_entry *snd_info_version_entry;
975
976 static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
977 {
978 snd_iprintf(buffer,
979 "Advanced Linux Sound Architecture Driver Version k%s.\n",
980 init_utsname()->release);
981 }
982
983 static int __init snd_info_version_init(void)
984 {
985 struct snd_info_entry *entry;
986
987 entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL);
988 if (entry == NULL)
989 return -ENOMEM;
990 entry->c.text.read = snd_info_version_read;
991 if (snd_info_register(entry) < 0) {
992 snd_info_free_entry(entry);
993 return -ENOMEM;
994 }
995 snd_info_version_entry = entry;
996 return 0;
997 }
998
999 static int __exit snd_info_version_done(void)
1000 {
1001 snd_info_free_entry(snd_info_version_entry);
1002 return 0;
1003 }
1004
1005 #endif /* CONFIG_PROC_FS */
Linus' kernel tree