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Merge tag 'v3.10.56' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / sound / core / info.c
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 unsigned long realloc_size;
257
258 data = file->private_data;
259 if (snd_BUG_ON(!data))
260 return -ENXIO;
261 entry = data->entry;
262 pos = *offset;
263 if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
264 return -EIO;
265 realloc_size = (unsigned long) pos + (unsigned long) count;
266 if (realloc_size < (unsigned long) pos || realloc_size > UINT_MAX)
267 return -EIO;
268 switch (entry->content) {
269 case SNDRV_INFO_CONTENT_TEXT:
270 buf = data->wbuffer;
271 if (buf == NULL)
272 return -EIO;
273 mutex_lock(&entry->access);
274 if (pos + count >= buf->len) {
275 if (resize_info_buffer(buf, pos + count)) {
276 mutex_unlock(&entry->access);
277 return -ENOMEM;
278 }
279 }
280 if (copy_from_user(buf->buffer + pos, buffer, count)) {
281 mutex_unlock(&entry->access);
282 return -EFAULT;
283 }
284 buf->size = pos + count;
285 mutex_unlock(&entry->access);
286 size = count;
287 break;
288 case SNDRV_INFO_CONTENT_DATA:
289 if (entry->c.ops->write && count > 0) {
290 size_t maxsize = entry->size - pos;
291 count = min(count, maxsize);
292 size = entry->c.ops->write(entry,
293 data->file_private_data,
294 file, buffer, count, pos);
295 }
296 break;
297 }
298 if ((ssize_t) size > 0)
299 *offset = pos + size;
300 return size;
301 }
302
303 static int snd_info_entry_open(struct inode *inode, struct file *file)
304 {
305 struct snd_info_entry *entry;
306 struct snd_info_private_data *data;
307 struct snd_info_buffer *buffer;
308 int mode, err;
309
310 mutex_lock(&info_mutex);
311 entry = PDE_DATA(inode);
312 if (entry == NULL || ! entry->p) {
313 mutex_unlock(&info_mutex);
314 return -ENODEV;
315 }
316 if (!try_module_get(entry->module)) {
317 err = -EFAULT;
318 goto __error1;
319 }
320 mode = file->f_flags & O_ACCMODE;
321 if (mode == O_RDONLY || mode == O_RDWR) {
322 if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
323 entry->c.ops->read == NULL)) {
324 err = -ENODEV;
325 goto __error;
326 }
327 }
328 if (mode == O_WRONLY || mode == O_RDWR) {
329 if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
330 entry->c.ops->write == NULL)) {
331 err = -ENODEV;
332 goto __error;
333 }
334 }
335 data = kzalloc(sizeof(*data), GFP_KERNEL);
336 if (data == NULL) {
337 err = -ENOMEM;
338 goto __error;
339 }
340 data->entry = entry;
341 switch (entry->content) {
342 case SNDRV_INFO_CONTENT_TEXT:
343 if (mode == O_RDONLY || mode == O_RDWR) {
344 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
345 if (buffer == NULL)
346 goto __nomem;
347 data->rbuffer = buffer;
348 buffer->len = PAGE_SIZE;
349 buffer->buffer = kzalloc(buffer->len, GFP_KERNEL);
350 if (buffer->buffer == NULL)
351 goto __nomem;
352 }
353 if (mode == O_WRONLY || mode == O_RDWR) {
354 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
355 if (buffer == NULL)
356 goto __nomem;
357 data->wbuffer = buffer;
358 buffer->len = PAGE_SIZE;
359 buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
360 if (buffer->buffer == NULL)
361 goto __nomem;
362 }
363 break;
364 case SNDRV_INFO_CONTENT_DATA: /* data */
365 if (entry->c.ops->open) {
366 if ((err = entry->c.ops->open(entry, mode,
367 &data->file_private_data)) < 0) {
368 kfree(data);
369 goto __error;
370 }
371 }
372 break;
373 }
374 file->private_data = data;
375 mutex_unlock(&info_mutex);
376 if (entry->content == SNDRV_INFO_CONTENT_TEXT &&
377 (mode == O_RDONLY || mode == O_RDWR)) {
378 if (entry->c.text.read) {
379 mutex_lock(&entry->access);
380 entry->c.text.read(entry, data->rbuffer);
381 mutex_unlock(&entry->access);
382 }
383 }
384 return 0;
385
386 __nomem:
387 if (data->rbuffer) {
388 kfree(data->rbuffer->buffer);
389 kfree(data->rbuffer);
390 }
391 if (data->wbuffer) {
392 kfree(data->wbuffer->buffer);
393 kfree(data->wbuffer);
394 }
395 kfree(data);
396 err = -ENOMEM;
397 __error:
398 module_put(entry->module);
399 __error1:
400 mutex_unlock(&info_mutex);
401 return err;
402 }
403
404 static int snd_info_entry_release(struct inode *inode, struct file *file)
405 {
406 struct snd_info_entry *entry;
407 struct snd_info_private_data *data;
408 int mode;
409
410 mode = file->f_flags & O_ACCMODE;
411 data = file->private_data;
412 entry = data->entry;
413 switch (entry->content) {
414 case SNDRV_INFO_CONTENT_TEXT:
415 if (data->rbuffer) {
416 kfree(data->rbuffer->buffer);
417 kfree(data->rbuffer);
418 }
419 if (data->wbuffer) {
420 if (entry->c.text.write) {
421 entry->c.text.write(entry, data->wbuffer);
422 if (data->wbuffer->error) {
423 snd_printk(KERN_WARNING "data write error to %s (%i)\n",
424 entry->name,
425 data->wbuffer->error);
426 }
427 }
428 kfree(data->wbuffer->buffer);
429 kfree(data->wbuffer);
430 }
431 break;
432 case SNDRV_INFO_CONTENT_DATA:
433 if (entry->c.ops->release)
434 entry->c.ops->release(entry, mode,
435 data->file_private_data);
436 break;
437 }
438 module_put(entry->module);
439 kfree(data);
440 return 0;
441 }
442
443 static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait)
444 {
445 struct snd_info_private_data *data;
446 struct snd_info_entry *entry;
447 unsigned int mask;
448
449 data = file->private_data;
450 if (data == NULL)
451 return 0;
452 entry = data->entry;
453 mask = 0;
454 switch (entry->content) {
455 case SNDRV_INFO_CONTENT_DATA:
456 if (entry->c.ops->poll)
457 return entry->c.ops->poll(entry,
458 data->file_private_data,
459 file, wait);
460 if (entry->c.ops->read)
461 mask |= POLLIN | POLLRDNORM;
462 if (entry->c.ops->write)
463 mask |= POLLOUT | POLLWRNORM;
464 break;
465 }
466 return mask;
467 }
468
469 static long snd_info_entry_ioctl(struct file *file, unsigned int cmd,
470 unsigned long arg)
471 {
472 struct snd_info_private_data *data;
473 struct snd_info_entry *entry;
474
475 data = file->private_data;
476 if (data == NULL)
477 return 0;
478 entry = data->entry;
479 switch (entry->content) {
480 case SNDRV_INFO_CONTENT_DATA:
481 if (entry->c.ops->ioctl)
482 return entry->c.ops->ioctl(entry,
483 data->file_private_data,
484 file, cmd, arg);
485 break;
486 }
487 return -ENOTTY;
488 }
489
490 static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma)
491 {
492 struct inode *inode = file_inode(file);
493 struct snd_info_private_data *data;
494 struct snd_info_entry *entry;
495
496 data = file->private_data;
497 if (data == NULL)
498 return 0;
499 entry = data->entry;
500 switch (entry->content) {
501 case SNDRV_INFO_CONTENT_DATA:
502 if (entry->c.ops->mmap)
503 return entry->c.ops->mmap(entry,
504 data->file_private_data,
505 inode, file, vma);
506 break;
507 }
508 return -ENXIO;
509 }
510
511 static const struct file_operations snd_info_entry_operations =
512 {
513 .owner = THIS_MODULE,
514 .llseek = snd_info_entry_llseek,
515 .read = snd_info_entry_read,
516 .write = snd_info_entry_write,
517 .poll = snd_info_entry_poll,
518 .unlocked_ioctl = snd_info_entry_ioctl,
519 .mmap = snd_info_entry_mmap,
520 .open = snd_info_entry_open,
521 .release = snd_info_entry_release,
522 };
523
524 int __init snd_info_init(void)
525 {
526 struct proc_dir_entry *p;
527
528 p = proc_mkdir("asound", NULL);
529 if (p == NULL)
530 return -ENOMEM;
531 snd_proc_root = p;
532 #ifdef CONFIG_SND_OSSEMUL
533 {
534 struct snd_info_entry *entry;
535 if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL)
536 return -ENOMEM;
537 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
538 if (snd_info_register(entry) < 0) {
539 snd_info_free_entry(entry);
540 return -ENOMEM;
541 }
542 snd_oss_root = entry;
543 }
544 #endif
545 #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
546 {
547 struct snd_info_entry *entry;
548 if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL)
549 return -ENOMEM;
550 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
551 if (snd_info_register(entry) < 0) {
552 snd_info_free_entry(entry);
553 return -ENOMEM;
554 }
555 snd_seq_root = entry;
556 }
557 #endif
558 snd_info_version_init();
559 snd_minor_info_init();
560 snd_minor_info_oss_init();
561 snd_card_info_init();
562 return 0;
563 }
564
565 int __exit snd_info_done(void)
566 {
567 snd_card_info_done();
568 snd_minor_info_oss_done();
569 snd_minor_info_done();
570 snd_info_version_done();
571 if (snd_proc_root) {
572 #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
573 snd_info_free_entry(snd_seq_root);
574 #endif
575 #ifdef CONFIG_SND_OSSEMUL
576 snd_info_free_entry(snd_oss_root);
577 #endif
578 proc_remove(snd_proc_root);
579 }
580 return 0;
581 }
582
583 /*
584
585 */
586
587
588 /*
589 * create a card proc file
590 * called from init.c
591 */
592 int snd_info_card_create(struct snd_card *card)
593 {
594 char str[8];
595 struct snd_info_entry *entry;
596
597 if (snd_BUG_ON(!card))
598 return -ENXIO;
599
600 sprintf(str, "card%i", card->number);
601 if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL)
602 return -ENOMEM;
603 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
604 if (snd_info_register(entry) < 0) {
605 snd_info_free_entry(entry);
606 return -ENOMEM;
607 }
608 card->proc_root = entry;
609 return 0;
610 }
611
612 /*
613 * register the card proc file
614 * called from init.c
615 */
616 int snd_info_card_register(struct snd_card *card)
617 {
618 struct proc_dir_entry *p;
619
620 if (snd_BUG_ON(!card))
621 return -ENXIO;
622
623 if (!strcmp(card->id, card->proc_root->name))
624 return 0;
625
626 p = proc_symlink(card->id, snd_proc_root, card->proc_root->name);
627 if (p == NULL)
628 return -ENOMEM;
629 card->proc_root_link = p;
630 return 0;
631 }
632
633 /*
634 * called on card->id change
635 */
636 void snd_info_card_id_change(struct snd_card *card)
637 {
638 mutex_lock(&info_mutex);
639 if (card->proc_root_link) {
640 proc_remove(card->proc_root_link);
641 card->proc_root_link = NULL;
642 }
643 if (strcmp(card->id, card->proc_root->name))
644 card->proc_root_link = proc_symlink(card->id,
645 snd_proc_root,
646 card->proc_root->name);
647 mutex_unlock(&info_mutex);
648 }
649
650 /*
651 * de-register the card proc file
652 * called from init.c
653 */
654 void snd_info_card_disconnect(struct snd_card *card)
655 {
656 if (!card)
657 return;
658 mutex_lock(&info_mutex);
659 proc_remove(card->proc_root_link);
660 card->proc_root_link = NULL;
661 if (card->proc_root)
662 snd_info_disconnect(card->proc_root);
663 mutex_unlock(&info_mutex);
664 }
665
666 /*
667 * release the card proc file resources
668 * called from init.c
669 */
670 int snd_info_card_free(struct snd_card *card)
671 {
672 if (!card)
673 return 0;
674 snd_info_free_entry(card->proc_root);
675 card->proc_root = NULL;
676 return 0;
677 }
678
679
680 /**
681 * snd_info_get_line - read one line from the procfs buffer
682 * @buffer: the procfs buffer
683 * @line: the buffer to store
684 * @len: the max. buffer size
685 *
686 * Reads one line from the buffer and stores the string.
687 *
688 * Return: Zero if successful, or 1 if error or EOF.
689 */
690 int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len)
691 {
692 int c = -1;
693
694 if (snd_BUG_ON(!buffer || !buffer->buffer))
695 return 1;
696 if (len <= 0 || buffer->stop || buffer->error)
697 return 1;
698 while (!buffer->stop) {
699 c = buffer->buffer[buffer->curr++];
700 if (buffer->curr >= buffer->size)
701 buffer->stop = 1;
702 if (c == '\n')
703 break;
704 if (len > 1) {
705 len--;
706 *line++ = c;
707 }
708 }
709 *line = '\0';
710 return 0;
711 }
712
713 EXPORT_SYMBOL(snd_info_get_line);
714
715 /**
716 * snd_info_get_str - parse a string token
717 * @dest: the buffer to store the string token
718 * @src: the original string
719 * @len: the max. length of token - 1
720 *
721 * Parses the original string and copy a token to the given
722 * string buffer.
723 *
724 * Return: The updated pointer of the original string so that
725 * it can be used for the next call.
726 */
727 const char *snd_info_get_str(char *dest, const char *src, int len)
728 {
729 int c;
730
731 while (*src == ' ' || *src == '\t')
732 src++;
733 if (*src == '"' || *src == '\'') {
734 c = *src++;
735 while (--len > 0 && *src && *src != c) {
736 *dest++ = *src++;
737 }
738 if (*src == c)
739 src++;
740 } else {
741 while (--len > 0 && *src && *src != ' ' && *src != '\t') {
742 *dest++ = *src++;
743 }
744 }
745 *dest = 0;
746 while (*src == ' ' || *src == '\t')
747 src++;
748 return src;
749 }
750
751 EXPORT_SYMBOL(snd_info_get_str);
752
753 /**
754 * snd_info_create_entry - create an info entry
755 * @name: the proc file name
756 *
757 * Creates an info entry with the given file name and initializes as
758 * the default state.
759 *
760 * Usually called from other functions such as
761 * snd_info_create_card_entry().
762 *
763 * Return: The pointer of the new instance, or %NULL on failure.
764 */
765 static struct snd_info_entry *snd_info_create_entry(const char *name)
766 {
767 struct snd_info_entry *entry;
768 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
769 if (entry == NULL)
770 return NULL;
771 entry->name = kstrdup(name, GFP_KERNEL);
772 if (entry->name == NULL) {
773 kfree(entry);
774 return NULL;
775 }
776 entry->mode = S_IFREG | S_IRUGO;
777 entry->content = SNDRV_INFO_CONTENT_TEXT;
778 mutex_init(&entry->access);
779 INIT_LIST_HEAD(&entry->children);
780 INIT_LIST_HEAD(&entry->list);
781 return entry;
782 }
783
784 /**
785 * snd_info_create_module_entry - create an info entry for the given module
786 * @module: the module pointer
787 * @name: the file name
788 * @parent: the parent directory
789 *
790 * Creates a new info entry and assigns it to the given module.
791 *
792 * Return: The pointer of the new instance, or %NULL on failure.
793 */
794 struct snd_info_entry *snd_info_create_module_entry(struct module * module,
795 const char *name,
796 struct snd_info_entry *parent)
797 {
798 struct snd_info_entry *entry = snd_info_create_entry(name);
799 if (entry) {
800 entry->module = module;
801 entry->parent = parent;
802 }
803 return entry;
804 }
805
806 EXPORT_SYMBOL(snd_info_create_module_entry);
807
808 /**
809 * snd_info_create_card_entry - create an info entry for the given card
810 * @card: the card instance
811 * @name: the file name
812 * @parent: the parent directory
813 *
814 * Creates a new info entry and assigns it to the given card.
815 *
816 * Return: The pointer of the new instance, or %NULL on failure.
817 */
818 struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
819 const char *name,
820 struct snd_info_entry * parent)
821 {
822 struct snd_info_entry *entry = snd_info_create_entry(name);
823 if (entry) {
824 entry->module = card->module;
825 entry->card = card;
826 entry->parent = parent;
827 }
828 return entry;
829 }
830
831 EXPORT_SYMBOL(snd_info_create_card_entry);
832
833 static void snd_info_disconnect(struct snd_info_entry *entry)
834 {
835 struct list_head *p, *n;
836 struct proc_dir_entry *root;
837
838 list_for_each_safe(p, n, &entry->children) {
839 snd_info_disconnect(list_entry(p, struct snd_info_entry, list));
840 }
841
842 if (! entry->p)
843 return;
844 list_del_init(&entry->list);
845 root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
846 snd_BUG_ON(!root);
847 proc_remove(entry->p);
848 entry->p = NULL;
849 }
850
851 static int snd_info_dev_free_entry(struct snd_device *device)
852 {
853 struct snd_info_entry *entry = device->device_data;
854 snd_info_free_entry(entry);
855 return 0;
856 }
857
858 static int snd_info_dev_register_entry(struct snd_device *device)
859 {
860 struct snd_info_entry *entry = device->device_data;
861 return snd_info_register(entry);
862 }
863
864 /**
865 * snd_card_proc_new - create an info entry for the given card
866 * @card: the card instance
867 * @name: the file name
868 * @entryp: the pointer to store the new info entry
869 *
870 * Creates a new info entry and assigns it to the given card.
871 * Unlike snd_info_create_card_entry(), this function registers the
872 * info entry as an ALSA device component, so that it can be
873 * unregistered/released without explicit call.
874 * Also, you don't have to register this entry via snd_info_register(),
875 * since this will be registered by snd_card_register() automatically.
876 *
877 * The parent is assumed as card->proc_root.
878 *
879 * For releasing this entry, use snd_device_free() instead of
880 * snd_info_free_entry().
881 *
882 * Return: Zero if successful, or a negative error code on failure.
883 */
884 int snd_card_proc_new(struct snd_card *card, const char *name,
885 struct snd_info_entry **entryp)
886 {
887 static struct snd_device_ops ops = {
888 .dev_free = snd_info_dev_free_entry,
889 .dev_register = snd_info_dev_register_entry,
890 /* disconnect is done via snd_info_card_disconnect() */
891 };
892 struct snd_info_entry *entry;
893 int err;
894
895 entry = snd_info_create_card_entry(card, name, card->proc_root);
896 if (! entry)
897 return -ENOMEM;
898 if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) {
899 snd_info_free_entry(entry);
900 return err;
901 }
902 if (entryp)
903 *entryp = entry;
904 return 0;
905 }
906
907 EXPORT_SYMBOL(snd_card_proc_new);
908
909 /**
910 * snd_info_free_entry - release the info entry
911 * @entry: the info entry
912 *
913 * Releases the info entry. Don't call this after registered.
914 */
915 void snd_info_free_entry(struct snd_info_entry * entry)
916 {
917 if (entry == NULL)
918 return;
919 if (entry->p) {
920 mutex_lock(&info_mutex);
921 snd_info_disconnect(entry);
922 mutex_unlock(&info_mutex);
923 }
924 kfree(entry->name);
925 if (entry->private_free)
926 entry->private_free(entry);
927 kfree(entry);
928 }
929
930 EXPORT_SYMBOL(snd_info_free_entry);
931
932 /**
933 * snd_info_register - register the info entry
934 * @entry: the info entry
935 *
936 * Registers the proc info entry.
937 *
938 * Return: Zero if successful, or a negative error code on failure.
939 */
940 int snd_info_register(struct snd_info_entry * entry)
941 {
942 struct proc_dir_entry *root, *p = NULL;
943
944 if (snd_BUG_ON(!entry))
945 return -ENXIO;
946 root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
947 mutex_lock(&info_mutex);
948 if (S_ISDIR(entry->mode)) {
949 p = proc_mkdir_mode(entry->name, entry->mode, root);
950 if (!p) {
951 mutex_unlock(&info_mutex);
952 return -ENOMEM;
953 }
954 } else {
955 p = proc_create_data(entry->name, entry->mode, root,
956 &snd_info_entry_operations, entry);
957 if (!p) {
958 mutex_unlock(&info_mutex);
959 return -ENOMEM;
960 }
961 proc_set_size(p, entry->size);
962 }
963 entry->p = p;
964 if (entry->parent)
965 list_add_tail(&entry->list, &entry->parent->children);
966 mutex_unlock(&info_mutex);
967 return 0;
968 }
969
970 EXPORT_SYMBOL(snd_info_register);
971
972 /*
973
974 */
975
976 static struct snd_info_entry *snd_info_version_entry;
977
978 static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
979 {
980 snd_iprintf(buffer,
981 "Advanced Linux Sound Architecture Driver Version k%s.\n",
982 init_utsname()->release);
983 }
984
985 static int __init snd_info_version_init(void)
986 {
987 struct snd_info_entry *entry;
988
989 entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL);
990 if (entry == NULL)
991 return -ENOMEM;
992 entry->c.text.read = snd_info_version_read;
993 if (snd_info_register(entry) < 0) {
994 snd_info_free_entry(entry);
995 return -ENOMEM;
996 }
997 snd_info_version_entry = entry;
998 return 0;
999 }
1000
1001 static int __exit snd_info_version_done(void)
1002 {
1003 snd_info_free_entry(snd_info_version_entry);
1004 return 0;
1005 }
1006
1007 #endif /* CONFIG_PROC_FS */
kernel source for telekom puls (alcatel/mediatek)