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writeback: split writeback_inodes_wb
[linux-2.6/next.git] / sound / core / info.c
blobb70564ed8b37821aa0f336d3585acf58da5854e3
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/smp_lock.h>
27 #include <linux/string.h>
28 #include <sound/core.h>
29 #include <sound/minors.h>
30 #include <sound/info.h>
31 #include <sound/version.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);
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 * Returns the size of output string.
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 void snd_remove_proc_entry(struct proc_dir_entry *parent,
157 struct proc_dir_entry *de)
158 {
159 if (de)
160 remove_proc_entry(de->name, parent);
161 }
162
163 static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
164 {
165 struct snd_info_private_data *data;
166 struct snd_info_entry *entry;
167 loff_t ret = -EINVAL, size;
168
169 data = file->private_data;
170 entry = data->entry;
171 mutex_lock(&entry->access);
172 if (entry->content == SNDRV_INFO_CONTENT_DATA &&
173 entry->c.ops->llseek) {
174 offset = entry->c.ops->llseek(entry,
175 data->file_private_data,
176 file, offset, orig);
177 goto out;
178 }
179 if (entry->content == SNDRV_INFO_CONTENT_DATA)
180 size = entry->size;
181 else
182 size = 0;
183 switch (orig) {
184 case SEEK_SET:
185 break;
186 case SEEK_CUR:
187 offset += file->f_pos;
188 break;
189 case SEEK_END:
190 if (!size)
191 goto out;
192 offset += size;
193 break;
194 default:
195 goto out;
196 }
197 if (offset < 0)
198 goto out;
199 if (size && offset > size)
200 offset = size;
201 file->f_pos = offset;
202 ret = offset;
203 out:
204 mutex_unlock(&entry->access);
205 return ret;
206 }
207
208 static ssize_t snd_info_entry_read(struct file *file, char __user *buffer,
209 size_t count, loff_t * offset)
210 {
211 struct snd_info_private_data *data;
212 struct snd_info_entry *entry;
213 struct snd_info_buffer *buf;
214 size_t size = 0;
215 loff_t pos;
216
217 data = file->private_data;
218 if (snd_BUG_ON(!data))
219 return -ENXIO;
220 pos = *offset;
221 if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
222 return -EIO;
223 if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
224 return -EIO;
225 entry = data->entry;
226 switch (entry->content) {
227 case SNDRV_INFO_CONTENT_TEXT:
228 buf = data->rbuffer;
229 if (buf == NULL)
230 return -EIO;
231 if (pos >= buf->size)
232 return 0;
233 size = buf->size - pos;
234 size = min(count, size);
235 if (copy_to_user(buffer, buf->buffer + pos, size))
236 return -EFAULT;
237 break;
238 case SNDRV_INFO_CONTENT_DATA:
239 if (pos >= entry->size)
240 return 0;
241 if (entry->c.ops->read) {
242 size = entry->size - pos;
243 size = min(count, size);
244 size = entry->c.ops->read(entry,
245 data->file_private_data,
246 file, buffer, size, pos);
247 }
248 break;
249 }
250 if ((ssize_t) size > 0)
251 *offset = pos + size;
252 return size;
253 }
254
255 static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer,
256 size_t count, loff_t * offset)
257 {
258 struct snd_info_private_data *data;
259 struct snd_info_entry *entry;
260 struct snd_info_buffer *buf;
261 ssize_t size = 0;
262 loff_t pos;
263
264 data = file->private_data;
265 if (snd_BUG_ON(!data))
266 return -ENXIO;
267 entry = data->entry;
268 pos = *offset;
269 if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
270 return -EIO;
271 if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
272 return -EIO;
273 switch (entry->content) {
274 case SNDRV_INFO_CONTENT_TEXT:
275 buf = data->wbuffer;
276 if (buf == NULL)
277 return -EIO;
278 mutex_lock(&entry->access);
279 if (pos + count >= buf->len) {
280 if (resize_info_buffer(buf, pos + count)) {
281 mutex_unlock(&entry->access);
282 return -ENOMEM;
283 }
284 }
285 if (copy_from_user(buf->buffer + pos, buffer, count)) {
286 mutex_unlock(&entry->access);
287 return -EFAULT;
288 }
289 buf->size = pos + count;
290 mutex_unlock(&entry->access);
291 size = count;
292 break;
293 case SNDRV_INFO_CONTENT_DATA:
294 if (entry->c.ops->write && count > 0) {
295 size_t maxsize = entry->size - pos;
296 count = min(count, maxsize);
297 size = entry->c.ops->write(entry,
298 data->file_private_data,
299 file, buffer, count, pos);
300 }
301 break;
302 }
303 if ((ssize_t) size > 0)
304 *offset = pos + size;
305 return size;
306 }
307
308 static int snd_info_entry_open(struct inode *inode, struct file *file)
309 {
310 struct snd_info_entry *entry;
311 struct snd_info_private_data *data;
312 struct snd_info_buffer *buffer;
313 struct proc_dir_entry *p;
314 int mode, err;
315
316 mutex_lock(&info_mutex);
317 p = PDE(inode);
318 entry = p == NULL ? NULL : (struct snd_info_entry *)p->data;
319 if (entry == NULL || ! entry->p) {
320 mutex_unlock(&info_mutex);
321 return -ENODEV;
322 }
323 if (!try_module_get(entry->module)) {
324 err = -EFAULT;
325 goto __error1;
326 }
327 mode = file->f_flags & O_ACCMODE;
328 if (mode == O_RDONLY || mode == O_RDWR) {
329 if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
330 entry->c.ops->read == NULL)) {
331 err = -ENODEV;
332 goto __error;
333 }
334 }
335 if (mode == O_WRONLY || mode == O_RDWR) {
336 if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
337 entry->c.ops->write == NULL)) {
338 err = -ENODEV;
339 goto __error;
340 }
341 }
342 data = kzalloc(sizeof(*data), GFP_KERNEL);
343 if (data == NULL) {
344 err = -ENOMEM;
345 goto __error;
346 }
347 data->entry = entry;
348 switch (entry->content) {
349 case SNDRV_INFO_CONTENT_TEXT:
350 if (mode == O_RDONLY || mode == O_RDWR) {
351 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
352 if (buffer == NULL)
353 goto __nomem;
354 data->rbuffer = buffer;
355 buffer->len = PAGE_SIZE;
356 buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
357 if (buffer->buffer == NULL)
358 goto __nomem;
359 }
360 if (mode == O_WRONLY || mode == O_RDWR) {
361 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
362 if (buffer == NULL)
363 goto __nomem;
364 data->wbuffer = buffer;
365 buffer->len = PAGE_SIZE;
366 buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
367 if (buffer->buffer == NULL)
368 goto __nomem;
369 }
370 break;
371 case SNDRV_INFO_CONTENT_DATA: /* data */
372 if (entry->c.ops->open) {
373 if ((err = entry->c.ops->open(entry, mode,
374 &data->file_private_data)) < 0) {
375 kfree(data);
376 goto __error;
377 }
378 }
379 break;
380 }
381 file->private_data = data;
382 mutex_unlock(&info_mutex);
383 if (entry->content == SNDRV_INFO_CONTENT_TEXT &&
384 (mode == O_RDONLY || mode == O_RDWR)) {
385 if (entry->c.text.read) {
386 mutex_lock(&entry->access);
387 entry->c.text.read(entry, data->rbuffer);
388 mutex_unlock(&entry->access);
389 }
390 }
391 return 0;
392
393 __nomem:
394 if (data->rbuffer) {
395 kfree(data->rbuffer->buffer);
396 kfree(data->rbuffer);
397 }
398 if (data->wbuffer) {
399 kfree(data->wbuffer->buffer);
400 kfree(data->wbuffer);
401 }
402 kfree(data);
403 err = -ENOMEM;
404 __error:
405 module_put(entry->module);
406 __error1:
407 mutex_unlock(&info_mutex);
408 return err;
409 }
410
411 static int snd_info_entry_release(struct inode *inode, struct file *file)
412 {
413 struct snd_info_entry *entry;
414 struct snd_info_private_data *data;
415 int mode;
416
417 mode = file->f_flags & O_ACCMODE;
418 data = file->private_data;
419 entry = data->entry;
420 switch (entry->content) {
421 case SNDRV_INFO_CONTENT_TEXT:
422 if (data->rbuffer) {
423 kfree(data->rbuffer->buffer);
424 kfree(data->rbuffer);
425 }
426 if (data->wbuffer) {
427 if (entry->c.text.write) {
428 entry->c.text.write(entry, data->wbuffer);
429 if (data->wbuffer->error) {
430 snd_printk(KERN_WARNING "data write error to %s (%i)\n",
431 entry->name,
432 data->wbuffer->error);
433 }
434 }
435 kfree(data->wbuffer->buffer);
436 kfree(data->wbuffer);
437 }
438 break;
439 case SNDRV_INFO_CONTENT_DATA:
440 if (entry->c.ops->release)
441 entry->c.ops->release(entry, mode,
442 data->file_private_data);
443 break;
444 }
445 module_put(entry->module);
446 kfree(data);
447 return 0;
448 }
449
450 static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait)
451 {
452 struct snd_info_private_data *data;
453 struct snd_info_entry *entry;
454 unsigned int mask;
455
456 data = file->private_data;
457 if (data == NULL)
458 return 0;
459 entry = data->entry;
460 mask = 0;
461 switch (entry->content) {
462 case SNDRV_INFO_CONTENT_DATA:
463 if (entry->c.ops->poll)
464 return entry->c.ops->poll(entry,
465 data->file_private_data,
466 file, wait);
467 if (entry->c.ops->read)
468 mask |= POLLIN | POLLRDNORM;
469 if (entry->c.ops->write)
470 mask |= POLLOUT | POLLWRNORM;
471 break;
472 }
473 return mask;
474 }
475
476 static long snd_info_entry_ioctl(struct file *file, unsigned int cmd,
477 unsigned long arg)
478 {
479 struct snd_info_private_data *data;
480 struct snd_info_entry *entry;
481
482 data = file->private_data;
483 if (data == NULL)
484 return 0;
485 entry = data->entry;
486 switch (entry->content) {
487 case SNDRV_INFO_CONTENT_DATA:
488 if (entry->c.ops->ioctl)
489 return entry->c.ops->ioctl(entry,
490 data->file_private_data,
491 file, cmd, arg);
492 break;
493 }
494 return -ENOTTY;
495 }
496
497 static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma)
498 {
499 struct inode *inode = file->f_path.dentry->d_inode;
500 struct snd_info_private_data *data;
501 struct snd_info_entry *entry;
502
503 data = file->private_data;
504 if (data == NULL)
505 return 0;
506 entry = data->entry;
507 switch (entry->content) {
508 case SNDRV_INFO_CONTENT_DATA:
509 if (entry->c.ops->mmap)
510 return entry->c.ops->mmap(entry,
511 data->file_private_data,
512 inode, file, vma);
513 break;
514 }
515 return -ENXIO;
516 }
517
518 static const struct file_operations snd_info_entry_operations =
519 {
520 .owner = THIS_MODULE,
521 .llseek = snd_info_entry_llseek,
522 .read = snd_info_entry_read,
523 .write = snd_info_entry_write,
524 .poll = snd_info_entry_poll,
525 .unlocked_ioctl = snd_info_entry_ioctl,
526 .mmap = snd_info_entry_mmap,
527 .open = snd_info_entry_open,
528 .release = snd_info_entry_release,
529 };
530
531 int __init snd_info_init(void)
532 {
533 struct proc_dir_entry *p;
534
535 p = create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, NULL);
536 if (p == NULL)
537 return -ENOMEM;
538 snd_proc_root = p;
539 #ifdef CONFIG_SND_OSSEMUL
540 {
541 struct snd_info_entry *entry;
542 if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL)
543 return -ENOMEM;
544 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
545 if (snd_info_register(entry) < 0) {
546 snd_info_free_entry(entry);
547 return -ENOMEM;
548 }
549 snd_oss_root = entry;
550 }
551 #endif
552 #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
553 {
554 struct snd_info_entry *entry;
555 if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL)
556 return -ENOMEM;
557 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
558 if (snd_info_register(entry) < 0) {
559 snd_info_free_entry(entry);
560 return -ENOMEM;
561 }
562 snd_seq_root = entry;
563 }
564 #endif
565 snd_info_version_init();
566 snd_minor_info_init();
567 snd_minor_info_oss_init();
568 snd_card_info_init();
569 return 0;
570 }
571
572 int __exit snd_info_done(void)
573 {
574 snd_card_info_done();
575 snd_minor_info_oss_done();
576 snd_minor_info_done();
577 snd_info_version_done();
578 if (snd_proc_root) {
579 #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
580 snd_info_free_entry(snd_seq_root);
581 #endif
582 #ifdef CONFIG_SND_OSSEMUL
583 snd_info_free_entry(snd_oss_root);
584 #endif
585 snd_remove_proc_entry(NULL, snd_proc_root);
586 }
587 return 0;
588 }
589
590 /*
591
592 */
593
594
595 /*
596 * create a card proc file
597 * called from init.c
598 */
599 int snd_info_card_create(struct snd_card *card)
600 {
601 char str[8];
602 struct snd_info_entry *entry;
603
604 if (snd_BUG_ON(!card))
605 return -ENXIO;
606
607 sprintf(str, "card%i", card->number);
608 if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL)
609 return -ENOMEM;
610 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
611 if (snd_info_register(entry) < 0) {
612 snd_info_free_entry(entry);
613 return -ENOMEM;
614 }
615 card->proc_root = entry;
616 return 0;
617 }
618
619 /*
620 * register the card proc file
621 * called from init.c
622 */
623 int snd_info_card_register(struct snd_card *card)
624 {
625 struct proc_dir_entry *p;
626
627 if (snd_BUG_ON(!card))
628 return -ENXIO;
629
630 if (!strcmp(card->id, card->proc_root->name))
631 return 0;
632
633 p = proc_symlink(card->id, snd_proc_root, card->proc_root->name);
634 if (p == NULL)
635 return -ENOMEM;
636 card->proc_root_link = p;
637 return 0;
638 }
639
640 /*
641 * called on card->id change
642 */
643 void snd_info_card_id_change(struct snd_card *card)
644 {
645 mutex_lock(&info_mutex);
646 if (card->proc_root_link) {
647 snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
648 card->proc_root_link = NULL;
649 }
650 if (strcmp(card->id, card->proc_root->name))
651 card->proc_root_link = proc_symlink(card->id,
652 snd_proc_root,
653 card->proc_root->name);
654 mutex_unlock(&info_mutex);
655 }
656
657 /*
658 * de-register the card proc file
659 * called from init.c
660 */
661 void snd_info_card_disconnect(struct snd_card *card)
662 {
663 if (!card)
664 return;
665 mutex_lock(&info_mutex);
666 if (card->proc_root_link) {
667 snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
668 card->proc_root_link = NULL;
669 }
670 if (card->proc_root)
671 snd_info_disconnect(card->proc_root);
672 mutex_unlock(&info_mutex);
673 }
674
675 /*
676 * release the card proc file resources
677 * called from init.c
678 */
679 int snd_info_card_free(struct snd_card *card)
680 {
681 if (!card)
682 return 0;
683 snd_info_free_entry(card->proc_root);
684 card->proc_root = NULL;
685 return 0;
686 }
687
688
689 /**
690 * snd_info_get_line - read one line from the procfs buffer
691 * @buffer: the procfs buffer
692 * @line: the buffer to store
693 * @len: the max. buffer size - 1
694 *
695 * Reads one line from the buffer and stores the string.
696 *
697 * Returns zero if successful, or 1 if error or EOF.
698 */
699 int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len)
700 {
701 int c = -1;
702
703 if (len <= 0 || buffer->stop || buffer->error)
704 return 1;
705 while (--len > 0) {
706 c = buffer->buffer[buffer->curr++];
707 if (c == '\n') {
708 if (buffer->curr >= buffer->size)
709 buffer->stop = 1;
710 break;
711 }
712 *line++ = c;
713 if (buffer->curr >= buffer->size) {
714 buffer->stop = 1;
715 break;
716 }
717 }
718 while (c != '\n' && !buffer->stop) {
719 c = buffer->buffer[buffer->curr++];
720 if (buffer->curr >= buffer->size)
721 buffer->stop = 1;
722 }
723 *line = '\0';
724 return 0;
725 }
726
727 EXPORT_SYMBOL(snd_info_get_line);
728
729 /**
730 * snd_info_get_str - parse a string token
731 * @dest: the buffer to store the string token
732 * @src: the original string
733 * @len: the max. length of token - 1
734 *
735 * Parses the original string and copy a token to the given
736 * string buffer.
737 *
738 * Returns the updated pointer of the original string so that
739 * it can be used for the next call.
740 */
741 const char *snd_info_get_str(char *dest, const char *src, int len)
742 {
743 int c;
744
745 while (*src == ' ' || *src == '\t')
746 src++;
747 if (*src == '"' || *src == '\'') {
748 c = *src++;
749 while (--len > 0 && *src && *src != c) {
750 *dest++ = *src++;
751 }
752 if (*src == c)
753 src++;
754 } else {
755 while (--len > 0 && *src && *src != ' ' && *src != '\t') {
756 *dest++ = *src++;
757 }
758 }
759 *dest = 0;
760 while (*src == ' ' || *src == '\t')
761 src++;
762 return src;
763 }
764
765 EXPORT_SYMBOL(snd_info_get_str);
766
767 /**
768 * snd_info_create_entry - create an info entry
769 * @name: the proc file name
770 *
771 * Creates an info entry with the given file name and initializes as
772 * the default state.
773 *
774 * Usually called from other functions such as
775 * snd_info_create_card_entry().
776 *
777 * Returns the pointer of the new instance, or NULL on failure.
778 */
779 static struct snd_info_entry *snd_info_create_entry(const char *name)
780 {
781 struct snd_info_entry *entry;
782 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
783 if (entry == NULL)
784 return NULL;
785 entry->name = kstrdup(name, GFP_KERNEL);
786 if (entry->name == NULL) {
787 kfree(entry);
788 return NULL;
789 }
790 entry->mode = S_IFREG | S_IRUGO;
791 entry->content = SNDRV_INFO_CONTENT_TEXT;
792 mutex_init(&entry->access);
793 INIT_LIST_HEAD(&entry->children);
794 INIT_LIST_HEAD(&entry->list);
795 return entry;
796 }
797
798 /**
799 * snd_info_create_module_entry - create an info entry for the given module
800 * @module: the module pointer
801 * @name: the file name
802 * @parent: the parent directory
803 *
804 * Creates a new info entry and assigns it to the given module.
805 *
806 * Returns the pointer of the new instance, or NULL on failure.
807 */
808 struct snd_info_entry *snd_info_create_module_entry(struct module * module,
809 const char *name,
810 struct snd_info_entry *parent)
811 {
812 struct snd_info_entry *entry = snd_info_create_entry(name);
813 if (entry) {
814 entry->module = module;
815 entry->parent = parent;
816 }
817 return entry;
818 }
819
820 EXPORT_SYMBOL(snd_info_create_module_entry);
821
822 /**
823 * snd_info_create_card_entry - create an info entry for the given card
824 * @card: the card instance
825 * @name: the file name
826 * @parent: the parent directory
827 *
828 * Creates a new info entry and assigns it to the given card.
829 *
830 * Returns the pointer of the new instance, or NULL on failure.
831 */
832 struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
833 const char *name,
834 struct snd_info_entry * parent)
835 {
836 struct snd_info_entry *entry = snd_info_create_entry(name);
837 if (entry) {
838 entry->module = card->module;
839 entry->card = card;
840 entry->parent = parent;
841 }
842 return entry;
843 }
844
845 EXPORT_SYMBOL(snd_info_create_card_entry);
846
847 static void snd_info_disconnect(struct snd_info_entry *entry)
848 {
849 struct list_head *p, *n;
850 struct proc_dir_entry *root;
851
852 list_for_each_safe(p, n, &entry->children) {
853 snd_info_disconnect(list_entry(p, struct snd_info_entry, list));
854 }
855
856 if (! entry->p)
857 return;
858 list_del_init(&entry->list);
859 root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
860 snd_BUG_ON(!root);
861 snd_remove_proc_entry(root, entry->p);
862 entry->p = NULL;
863 }
864
865 static int snd_info_dev_free_entry(struct snd_device *device)
866 {
867 struct snd_info_entry *entry = device->device_data;
868 snd_info_free_entry(entry);
869 return 0;
870 }
871
872 static int snd_info_dev_register_entry(struct snd_device *device)
873 {
874 struct snd_info_entry *entry = device->device_data;
875 return snd_info_register(entry);
876 }
877
878 /**
879 * snd_card_proc_new - create an info entry for the given card
880 * @card: the card instance
881 * @name: the file name
882 * @entryp: the pointer to store the new info entry
883 *
884 * Creates a new info entry and assigns it to the given card.
885 * Unlike snd_info_create_card_entry(), this function registers the
886 * info entry as an ALSA device component, so that it can be
887 * unregistered/released without explicit call.
888 * Also, you don't have to register this entry via snd_info_register(),
889 * since this will be registered by snd_card_register() automatically.
890 *
891 * The parent is assumed as card->proc_root.
892 *
893 * For releasing this entry, use snd_device_free() instead of
894 * snd_info_free_entry().
895 *
896 * Returns zero if successful, or a negative error code on failure.
897 */
898 int snd_card_proc_new(struct snd_card *card, const char *name,
899 struct snd_info_entry **entryp)
900 {
901 static struct snd_device_ops ops = {
902 .dev_free = snd_info_dev_free_entry,
903 .dev_register = snd_info_dev_register_entry,
904 /* disconnect is done via snd_info_card_disconnect() */
905 };
906 struct snd_info_entry *entry;
907 int err;
908
909 entry = snd_info_create_card_entry(card, name, card->proc_root);
910 if (! entry)
911 return -ENOMEM;
912 if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) {
913 snd_info_free_entry(entry);
914 return err;
915 }
916 if (entryp)
917 *entryp = entry;
918 return 0;
919 }
920
921 EXPORT_SYMBOL(snd_card_proc_new);
922
923 /**
924 * snd_info_free_entry - release the info entry
925 * @entry: the info entry
926 *
927 * Releases the info entry. Don't call this after registered.
928 */
929 void snd_info_free_entry(struct snd_info_entry * entry)
930 {
931 if (entry == NULL)
932 return;
933 if (entry->p) {
934 mutex_lock(&info_mutex);
935 snd_info_disconnect(entry);
936 mutex_unlock(&info_mutex);
937 }
938 kfree(entry->name);
939 if (entry->private_free)
940 entry->private_free(entry);
941 kfree(entry);
942 }
943
944 EXPORT_SYMBOL(snd_info_free_entry);
945
946 /**
947 * snd_info_register - register the info entry
948 * @entry: the info entry
949 *
950 * Registers the proc info entry.
951 *
952 * Returns zero if successful, or a negative error code on failure.
953 */
954 int snd_info_register(struct snd_info_entry * entry)
955 {
956 struct proc_dir_entry *root, *p = NULL;
957
958 if (snd_BUG_ON(!entry))
959 return -ENXIO;
960 root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
961 mutex_lock(&info_mutex);
962 p = create_proc_entry(entry->name, entry->mode, root);
963 if (!p) {
964 mutex_unlock(&info_mutex);
965 return -ENOMEM;
966 }
967 if (!S_ISDIR(entry->mode))
968 p->proc_fops = &snd_info_entry_operations;
969 p->size = entry->size;
970 p->data = entry;
971 entry->p = p;
972 if (entry->parent)
973 list_add_tail(&entry->list, &entry->parent->children);
974 mutex_unlock(&info_mutex);
975 return 0;
976 }
977
978 EXPORT_SYMBOL(snd_info_register);
979
980 /*
981
982 */
983
984 static struct snd_info_entry *snd_info_version_entry;
985
986 static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
987 {
988 snd_iprintf(buffer,
989 "Advanced Linux Sound Architecture Driver Version "
990 CONFIG_SND_VERSION CONFIG_SND_DATE ".\n"
991 );
992 }
993
994 static int __init snd_info_version_init(void)
995 {
996 struct snd_info_entry *entry;
997
998 entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL);
999 if (entry == NULL)
1000 return -ENOMEM;
1001 entry->c.text.read = snd_info_version_read;
1002 if (snd_info_register(entry) < 0) {
1003 snd_info_free_entry(entry);
1004 return -ENOMEM;
1005 }
1006 snd_info_version_entry = entry;
1007 return 0;
1008 }
1009
1010 static int __exit snd_info_version_done(void)
1011 {
1012 snd_info_free_entry(snd_info_version_entry);
1013 return 0;
1014 }
1015
1016 #endif /* CONFIG_PROC_FS */
linux-next