staging: brcm80211: assure common sources are truly common
[zen-stable.git] / sound / core / info.c
blob7077f601da5a66a279bed9be77159f2ec80dfc78
1 /*
2 * Information interface for ALSA driver
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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.
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.
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
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>
39 #ifdef CONFIG_PROC_FS
41 int snd_info_check_reserved_words(const char *str)
43 static char *reserved[] =
45 "version",
46 "meminfo",
47 "memdebug",
48 "detect",
49 "devices",
50 "oss",
51 "cards",
52 "timers",
53 "synth",
54 "pcm",
55 "seq",
56 NULL
58 char **xstr = reserved;
60 while (*xstr) {
61 if (!strcmp(*xstr, str))
62 return 0;
63 xstr++;
65 if (!strncmp(str, "card", 4))
66 return 0;
67 return 1;
70 static DEFINE_MUTEX(info_mutex);
72 struct 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;
79 static int snd_info_version_init(void);
80 static int snd_info_version_done(void);
81 static void snd_info_disconnect(struct snd_info_entry *entry);
84 /* resize the proc r/w buffer */
85 static int resize_info_buffer(struct snd_info_buffer *buffer,
86 unsigned int nsize)
88 char *nbuf;
90 nsize = PAGE_ALIGN(nsize);
91 nbuf = krealloc(buffer->buffer, nsize, GFP_KERNEL);
92 if (! nbuf)
93 return -ENOMEM;
95 buffer->buffer = nbuf;
96 buffer->len = nsize;
97 return 0;
101 * snd_iprintf - printf on the procfs buffer
102 * @buffer: the procfs buffer
103 * @fmt: the printf format
105 * Outputs the string on the procfs buffer just like printf().
107 * Returns the size of output string.
109 int snd_iprintf(struct snd_info_buffer *buffer, const char *fmt, ...)
111 va_list args;
112 int len, res;
113 int err = 0;
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;
132 va_end(args);
134 if (err < 0)
135 return err;
136 buffer->curr += res;
137 buffer->size += res;
138 return res;
141 EXPORT_SYMBOL(snd_iprintf);
147 static struct proc_dir_entry *snd_proc_root;
148 struct snd_info_entry *snd_seq_root;
149 EXPORT_SYMBOL(snd_seq_root);
151 #ifdef CONFIG_SND_OSSEMUL
152 struct snd_info_entry *snd_oss_root;
153 #endif
155 static void snd_remove_proc_entry(struct proc_dir_entry *parent,
156 struct proc_dir_entry *de)
158 if (de)
159 remove_proc_entry(de->name, parent);
162 static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
164 struct snd_info_private_data *data;
165 struct snd_info_entry *entry;
166 loff_t ret = -EINVAL, size;
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;
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;
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;
207 static ssize_t snd_info_entry_read(struct file *file, char __user *buffer,
208 size_t count, loff_t * offset)
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;
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);
247 break;
249 if ((ssize_t) size > 0)
250 *offset = pos + size;
251 return size;
254 static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer,
255 size_t count, loff_t * offset)
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;
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;
284 if (copy_from_user(buf->buffer + pos, buffer, count)) {
285 mutex_unlock(&entry->access);
286 return -EFAULT;
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);
300 break;
302 if ((ssize_t) size > 0)
303 *offset = pos + size;
304 return size;
307 static int snd_info_entry_open(struct inode *inode, struct file *file)
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;
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;
322 if (!try_module_get(entry->module)) {
323 err = -EFAULT;
324 goto __error1;
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;
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;
341 data = kzalloc(sizeof(*data), GFP_KERNEL);
342 if (data == NULL) {
343 err = -ENOMEM;
344 goto __error;
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;
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;
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;
378 break;
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);
390 return 0;
392 __nomem:
393 if (data->rbuffer) {
394 kfree(data->rbuffer->buffer);
395 kfree(data->rbuffer);
397 if (data->wbuffer) {
398 kfree(data->wbuffer->buffer);
399 kfree(data->wbuffer);
401 kfree(data);
402 err = -ENOMEM;
403 __error:
404 module_put(entry->module);
405 __error1:
406 mutex_unlock(&info_mutex);
407 return err;
410 static int snd_info_entry_release(struct inode *inode, struct file *file)
412 struct snd_info_entry *entry;
413 struct snd_info_private_data *data;
414 int mode;
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);
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);
434 kfree(data->wbuffer->buffer);
435 kfree(data->wbuffer);
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;
444 module_put(entry->module);
445 kfree(data);
446 return 0;
449 static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait)
451 struct snd_info_private_data *data;
452 struct snd_info_entry *entry;
453 unsigned int mask;
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;
472 return mask;
475 static long snd_info_entry_ioctl(struct file *file, unsigned int cmd,
476 unsigned long arg)
478 struct snd_info_private_data *data;
479 struct snd_info_entry *entry;
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;
493 return -ENOTTY;
496 static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma)
498 struct inode *inode = file->f_path.dentry->d_inode;
499 struct snd_info_private_data *data;
500 struct snd_info_entry *entry;
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;
514 return -ENXIO;
517 static const struct file_operations snd_info_entry_operations =
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,
530 int __init snd_info_init(void)
532 struct proc_dir_entry *p;
534 p = create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, NULL);
535 if (p == NULL)
536 return -ENOMEM;
537 snd_proc_root = p;
538 #ifdef CONFIG_SND_OSSEMUL
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;
548 snd_oss_root = entry;
550 #endif
551 #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
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;
561 snd_seq_root = entry;
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;
571 int __exit snd_info_done(void)
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);
586 return 0;
595 * create a card proc file
596 * called from init.c
598 int snd_info_card_create(struct snd_card *card)
600 char str[8];
601 struct snd_info_entry *entry;
603 if (snd_BUG_ON(!card))
604 return -ENXIO;
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;
614 card->proc_root = entry;
615 return 0;
619 * register the card proc file
620 * called from init.c
622 int snd_info_card_register(struct snd_card *card)
624 struct proc_dir_entry *p;
626 if (snd_BUG_ON(!card))
627 return -ENXIO;
629 if (!strcmp(card->id, card->proc_root->name))
630 return 0;
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;
640 * called on card->id change
642 void snd_info_card_id_change(struct snd_card *card)
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;
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);
657 * de-register the card proc file
658 * called from init.c
660 void snd_info_card_disconnect(struct snd_card *card)
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;
669 if (card->proc_root)
670 snd_info_disconnect(card->proc_root);
671 mutex_unlock(&info_mutex);
675 * release the card proc file resources
676 * called from init.c
678 int snd_info_card_free(struct snd_card *card)
680 if (!card)
681 return 0;
682 snd_info_free_entry(card->proc_root);
683 card->proc_root = NULL;
684 return 0;
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
694 * Reads one line from the buffer and stores the string.
696 * Returns zero if successful, or 1 if error or EOF.
698 int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len)
700 int c = -1;
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;
711 *line++ = c;
712 if (buffer->curr >= buffer->size) {
713 buffer->stop = 1;
714 break;
717 while (c != '\n' && !buffer->stop) {
718 c = buffer->buffer[buffer->curr++];
719 if (buffer->curr >= buffer->size)
720 buffer->stop = 1;
722 *line = '\0';
723 return 0;
726 EXPORT_SYMBOL(snd_info_get_line);
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
734 * Parses the original string and copy a token to the given
735 * string buffer.
737 * Returns the updated pointer of the original string so that
738 * it can be used for the next call.
740 const char *snd_info_get_str(char *dest, const char *src, int len)
742 int c;
744 while (*src == ' ' || *src == '\t')
745 src++;
746 if (*src == '"' || *src == '\'') {
747 c = *src++;
748 while (--len > 0 && *src && *src != c) {
749 *dest++ = *src++;
751 if (*src == c)
752 src++;
753 } else {
754 while (--len > 0 && *src && *src != ' ' && *src != '\t') {
755 *dest++ = *src++;
758 *dest = 0;
759 while (*src == ' ' || *src == '\t')
760 src++;
761 return src;
764 EXPORT_SYMBOL(snd_info_get_str);
767 * snd_info_create_entry - create an info entry
768 * @name: the proc file name
770 * Creates an info entry with the given file name and initializes as
771 * the default state.
773 * Usually called from other functions such as
774 * snd_info_create_card_entry().
776 * Returns the pointer of the new instance, or NULL on failure.
778 static struct snd_info_entry *snd_info_create_entry(const char *name)
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;
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;
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
803 * Creates a new info entry and assigns it to the given module.
805 * Returns the pointer of the new instance, or NULL on failure.
807 struct snd_info_entry *snd_info_create_module_entry(struct module * module,
808 const char *name,
809 struct snd_info_entry *parent)
811 struct snd_info_entry *entry = snd_info_create_entry(name);
812 if (entry) {
813 entry->module = module;
814 entry->parent = parent;
816 return entry;
819 EXPORT_SYMBOL(snd_info_create_module_entry);
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
827 * Creates a new info entry and assigns it to the given card.
829 * Returns the pointer of the new instance, or NULL on failure.
831 struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
832 const char *name,
833 struct snd_info_entry * parent)
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;
841 return entry;
844 EXPORT_SYMBOL(snd_info_create_card_entry);
846 static void snd_info_disconnect(struct snd_info_entry *entry)
848 struct list_head *p, *n;
849 struct proc_dir_entry *root;
851 list_for_each_safe(p, n, &entry->children) {
852 snd_info_disconnect(list_entry(p, struct snd_info_entry, list));
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;
864 static int snd_info_dev_free_entry(struct snd_device *device)
866 struct snd_info_entry *entry = device->device_data;
867 snd_info_free_entry(entry);
868 return 0;
871 static int snd_info_dev_register_entry(struct snd_device *device)
873 struct snd_info_entry *entry = device->device_data;
874 return snd_info_register(entry);
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
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.
890 * The parent is assumed as card->proc_root.
892 * For releasing this entry, use snd_device_free() instead of
893 * snd_info_free_entry().
895 * Returns zero if successful, or a negative error code on failure.
897 int snd_card_proc_new(struct snd_card *card, const char *name,
898 struct snd_info_entry **entryp)
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() */
905 struct snd_info_entry *entry;
906 int err;
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;
915 if (entryp)
916 *entryp = entry;
917 return 0;
920 EXPORT_SYMBOL(snd_card_proc_new);
923 * snd_info_free_entry - release the info entry
924 * @entry: the info entry
926 * Releases the info entry. Don't call this after registered.
928 void snd_info_free_entry(struct snd_info_entry * entry)
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);
937 kfree(entry->name);
938 if (entry->private_free)
939 entry->private_free(entry);
940 kfree(entry);
943 EXPORT_SYMBOL(snd_info_free_entry);
946 * snd_info_register - register the info entry
947 * @entry: the info entry
949 * Registers the proc info entry.
951 * Returns zero if successful, or a negative error code on failure.
953 int snd_info_register(struct snd_info_entry * entry)
955 struct proc_dir_entry *root, *p = NULL;
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;
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;
977 EXPORT_SYMBOL(snd_info_register);
983 static struct snd_info_entry *snd_info_version_entry;
985 static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
987 snd_iprintf(buffer,
988 "Advanced Linux Sound Architecture Driver Version "
989 CONFIG_SND_VERSION CONFIG_SND_DATE ".\n"
993 static int __init snd_info_version_init(void)
995 struct snd_info_entry *entry;
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;
1005 snd_info_version_entry = entry;
1006 return 0;
1009 static int __exit snd_info_version_done(void)
1011 snd_info_free_entry(snd_info_version_entry);
1012 return 0;
1015 #endif /* CONFIG_PROC_FS */