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drm: prune modes when output is disconnected.
[linux-2.6/mini2440.git] / sound / core / info.c
blob35df614f6c5599329a403beb7295f3ffe3a51d2e
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/smp_lock.h>
26 #include <linux/string.h>
27 #include <sound/core.h>
28 #include <sound/minors.h>
29 #include <sound/info.h>
30 #include <sound/version.h>
31 #include <linux/proc_fs.h>
32 #include <linux/mutex.h>
33 #include <stdarg.h>
34
35 /*
36 *
37 */
38
39 #ifdef CONFIG_PROC_FS
40
41 int snd_info_check_reserved_words(const char *str)
42 {
43 static char *reserved[] =
44 {
45 "version",
46 "meminfo",
47 "memdebug",
48 "detect",
49 "devices",
50 "oss",
51 "cards",
52 "timers",
53 "synth",
54 "pcm",
55 "seq",
56 NULL
57 };
58 char **xstr = reserved;
59
60 while (*xstr) {
61 if (!strcmp(*xstr, str))
62 return 0;
63 xstr++;
64 }
65 if (!strncmp(str, "card", 4))
66 return 0;
67 return 1;
68 }
69
70 static DEFINE_MUTEX(info_mutex);
71
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;
77 };
78
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);
82
83
84 /* resize the proc r/w buffer */
85 static int resize_info_buffer(struct snd_info_buffer *buffer,
86 unsigned int nsize)
87 {
88 char *nbuf;
89
90 nsize = PAGE_ALIGN(nsize);
91 nbuf = kmalloc(nsize, GFP_KERNEL);
92 if (! nbuf)
93 return -ENOMEM;
94
95 memcpy(nbuf, buffer->buffer, buffer->len);
96 kfree(buffer->buffer);
97 buffer->buffer = nbuf;
98 buffer->len = nsize;
99 return 0;
100 }
101
102 /**
103 * snd_iprintf - printf on the procfs buffer
104 * @buffer: the procfs buffer
105 * @fmt: the printf format
106 *
107 * Outputs the string on the procfs buffer just like printf().
108 *
109 * Returns the size of output string.
110 */
111 int snd_iprintf(struct snd_info_buffer *buffer, char *fmt,...)
112 {
113 va_list args;
114 int len, res;
115 int err = 0;
116
117 might_sleep();
118 if (buffer->stop || buffer->error)
119 return 0;
120 len = buffer->len - buffer->size;
121 va_start(args, fmt);
122 for (;;) {
123 va_list ap;
124 va_copy(ap, args);
125 res = vsnprintf(buffer->buffer + buffer->curr, len, fmt, ap);
126 va_end(ap);
127 if (res < len)
128 break;
129 err = resize_info_buffer(buffer, buffer->len + PAGE_SIZE);
130 if (err < 0)
131 break;
132 len = buffer->len - buffer->size;
133 }
134 va_end(args);
135
136 if (err < 0)
137 return err;
138 buffer->curr += res;
139 buffer->size += res;
140 return res;
141 }
142
143 EXPORT_SYMBOL(snd_iprintf);
144
145 /*
146
147 */
148
149 static struct proc_dir_entry *snd_proc_root;
150 struct snd_info_entry *snd_seq_root;
151 EXPORT_SYMBOL(snd_seq_root);
152
153 #ifdef CONFIG_SND_OSSEMUL
154 struct snd_info_entry *snd_oss_root;
155 #endif
156
157 static void snd_remove_proc_entry(struct proc_dir_entry *parent,
158 struct proc_dir_entry *de)
159 {
160 if (de)
161 remove_proc_entry(de->name, parent);
162 }
163
164 static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
165 {
166 struct snd_info_private_data *data;
167 struct snd_info_entry *entry;
168 loff_t ret;
169
170 data = file->private_data;
171 entry = data->entry;
172 lock_kernel();
173 switch (entry->content) {
174 case SNDRV_INFO_CONTENT_TEXT:
175 switch (orig) {
176 case SEEK_SET:
177 file->f_pos = offset;
178 ret = file->f_pos;
179 goto out;
180 case SEEK_CUR:
181 file->f_pos += offset;
182 ret = file->f_pos;
183 goto out;
184 case SEEK_END:
185 default:
186 ret = -EINVAL;
187 goto out;
188 }
189 break;
190 case SNDRV_INFO_CONTENT_DATA:
191 if (entry->c.ops->llseek) {
192 ret = entry->c.ops->llseek(entry,
193 data->file_private_data,
194 file, offset, orig);
195 goto out;
196 }
197 break;
198 }
199 ret = -ENXIO;
200 out:
201 unlock_kernel();
202 return ret;
203 }
204
205 static ssize_t snd_info_entry_read(struct file *file, char __user *buffer,
206 size_t count, loff_t * offset)
207 {
208 struct snd_info_private_data *data;
209 struct snd_info_entry *entry;
210 struct snd_info_buffer *buf;
211 size_t size = 0;
212 loff_t pos;
213
214 data = file->private_data;
215 if (snd_BUG_ON(!data))
216 return -ENXIO;
217 pos = *offset;
218 if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
219 return -EIO;
220 if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
221 return -EIO;
222 entry = data->entry;
223 switch (entry->content) {
224 case SNDRV_INFO_CONTENT_TEXT:
225 buf = data->rbuffer;
226 if (buf == NULL)
227 return -EIO;
228 if (pos >= buf->size)
229 return 0;
230 size = buf->size - pos;
231 size = min(count, size);
232 if (copy_to_user(buffer, buf->buffer + pos, size))
233 return -EFAULT;
234 break;
235 case SNDRV_INFO_CONTENT_DATA:
236 if (entry->c.ops->read)
237 size = entry->c.ops->read(entry,
238 data->file_private_data,
239 file, buffer, count, pos);
240 break;
241 }
242 if ((ssize_t) size > 0)
243 *offset = pos + size;
244 return size;
245 }
246
247 static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer,
248 size_t count, loff_t * offset)
249 {
250 struct snd_info_private_data *data;
251 struct snd_info_entry *entry;
252 struct snd_info_buffer *buf;
253 ssize_t size = 0;
254 loff_t pos;
255
256 data = file->private_data;
257 if (snd_BUG_ON(!data))
258 return -ENXIO;
259 entry = data->entry;
260 pos = *offset;
261 if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
262 return -EIO;
263 if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
264 return -EIO;
265 switch (entry->content) {
266 case SNDRV_INFO_CONTENT_TEXT:
267 buf = data->wbuffer;
268 if (buf == NULL)
269 return -EIO;
270 mutex_lock(&entry->access);
271 if (pos + count >= buf->len) {
272 if (resize_info_buffer(buf, pos + count)) {
273 mutex_unlock(&entry->access);
274 return -ENOMEM;
275 }
276 }
277 if (copy_from_user(buf->buffer + pos, buffer, count)) {
278 mutex_unlock(&entry->access);
279 return -EFAULT;
280 }
281 buf->size = pos + count;
282 mutex_unlock(&entry->access);
283 size = count;
284 break;
285 case SNDRV_INFO_CONTENT_DATA:
286 if (entry->c.ops->write)
287 size = entry->c.ops->write(entry,
288 data->file_private_data,
289 file, buffer, count, pos);
290 break;
291 }
292 if ((ssize_t) size > 0)
293 *offset = pos + size;
294 return size;
295 }
296
297 static int snd_info_entry_open(struct inode *inode, struct file *file)
298 {
299 struct snd_info_entry *entry;
300 struct snd_info_private_data *data;
301 struct snd_info_buffer *buffer;
302 struct proc_dir_entry *p;
303 int mode, err;
304
305 mutex_lock(&info_mutex);
306 p = PDE(inode);
307 entry = p == NULL ? NULL : (struct snd_info_entry *)p->data;
308 if (entry == NULL || ! entry->p) {
309 mutex_unlock(&info_mutex);
310 return -ENODEV;
311 }
312 if (!try_module_get(entry->module)) {
313 err = -EFAULT;
314 goto __error1;
315 }
316 mode = file->f_flags & O_ACCMODE;
317 if (mode == O_RDONLY || mode == O_RDWR) {
318 if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
319 entry->c.ops->read == NULL)) {
320 err = -ENODEV;
321 goto __error;
322 }
323 }
324 if (mode == O_WRONLY || mode == O_RDWR) {
325 if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
326 entry->c.ops->write == NULL)) {
327 err = -ENODEV;
328 goto __error;
329 }
330 }
331 data = kzalloc(sizeof(*data), GFP_KERNEL);
332 if (data == NULL) {
333 err = -ENOMEM;
334 goto __error;
335 }
336 data->entry = entry;
337 switch (entry->content) {
338 case SNDRV_INFO_CONTENT_TEXT:
339 if (mode == O_RDONLY || mode == O_RDWR) {
340 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
341 if (buffer == NULL)
342 goto __nomem;
343 data->rbuffer = buffer;
344 buffer->len = PAGE_SIZE;
345 buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
346 if (buffer->buffer == NULL)
347 goto __nomem;
348 }
349 if (mode == O_WRONLY || mode == O_RDWR) {
350 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
351 if (buffer == NULL)
352 goto __nomem;
353 data->wbuffer = buffer;
354 buffer->len = PAGE_SIZE;
355 buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
356 if (buffer->buffer == NULL)
357 goto __nomem;
358 }
359 break;
360 case SNDRV_INFO_CONTENT_DATA: /* data */
361 if (entry->c.ops->open) {
362 if ((err = entry->c.ops->open(entry, mode,
363 &data->file_private_data)) < 0) {
364 kfree(data);
365 goto __error;
366 }
367 }
368 break;
369 }
370 file->private_data = data;
371 mutex_unlock(&info_mutex);
372 if (entry->content == SNDRV_INFO_CONTENT_TEXT &&
373 (mode == O_RDONLY || mode == O_RDWR)) {
374 if (entry->c.text.read) {
375 mutex_lock(&entry->access);
376 entry->c.text.read(entry, data->rbuffer);
377 mutex_unlock(&entry->access);
378 }
379 }
380 return 0;
381
382 __nomem:
383 if (data->rbuffer) {
384 kfree(data->rbuffer->buffer);
385 kfree(data->rbuffer);
386 }
387 if (data->wbuffer) {
388 kfree(data->wbuffer->buffer);
389 kfree(data->wbuffer);
390 }
391 kfree(data);
392 err = -ENOMEM;
393 __error:
394 module_put(entry->module);
395 __error1:
396 mutex_unlock(&info_mutex);
397 return err;
398 }
399
400 static int snd_info_entry_release(struct inode *inode, struct file *file)
401 {
402 struct snd_info_entry *entry;
403 struct snd_info_private_data *data;
404 int mode;
405
406 mode = file->f_flags & O_ACCMODE;
407 data = file->private_data;
408 entry = data->entry;
409 switch (entry->content) {
410 case SNDRV_INFO_CONTENT_TEXT:
411 if (data->rbuffer) {
412 kfree(data->rbuffer->buffer);
413 kfree(data->rbuffer);
414 }
415 if (data->wbuffer) {
416 if (entry->c.text.write) {
417 entry->c.text.write(entry, data->wbuffer);
418 if (data->wbuffer->error) {
419 snd_printk(KERN_WARNING "data write error to %s (%i)\n",
420 entry->name,
421 data->wbuffer->error);
422 }
423 }
424 kfree(data->wbuffer->buffer);
425 kfree(data->wbuffer);
426 }
427 break;
428 case SNDRV_INFO_CONTENT_DATA:
429 if (entry->c.ops->release)
430 entry->c.ops->release(entry, mode,
431 data->file_private_data);
432 break;
433 }
434 module_put(entry->module);
435 kfree(data);
436 return 0;
437 }
438
439 static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait)
440 {
441 struct snd_info_private_data *data;
442 struct snd_info_entry *entry;
443 unsigned int mask;
444
445 data = file->private_data;
446 if (data == NULL)
447 return 0;
448 entry = data->entry;
449 mask = 0;
450 switch (entry->content) {
451 case SNDRV_INFO_CONTENT_DATA:
452 if (entry->c.ops->poll)
453 return entry->c.ops->poll(entry,
454 data->file_private_data,
455 file, wait);
456 if (entry->c.ops->read)
457 mask |= POLLIN | POLLRDNORM;
458 if (entry->c.ops->write)
459 mask |= POLLOUT | POLLWRNORM;
460 break;
461 }
462 return mask;
463 }
464
465 static long snd_info_entry_ioctl(struct file *file, unsigned int cmd,
466 unsigned long arg)
467 {
468 struct snd_info_private_data *data;
469 struct snd_info_entry *entry;
470
471 data = file->private_data;
472 if (data == NULL)
473 return 0;
474 entry = data->entry;
475 switch (entry->content) {
476 case SNDRV_INFO_CONTENT_DATA:
477 if (entry->c.ops->ioctl)
478 return entry->c.ops->ioctl(entry,
479 data->file_private_data,
480 file, cmd, arg);
481 break;
482 }
483 return -ENOTTY;
484 }
485
486 static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma)
487 {
488 struct inode *inode = file->f_path.dentry->d_inode;
489 struct snd_info_private_data *data;
490 struct snd_info_entry *entry;
491
492 data = file->private_data;
493 if (data == NULL)
494 return 0;
495 entry = data->entry;
496 switch (entry->content) {
497 case SNDRV_INFO_CONTENT_DATA:
498 if (entry->c.ops->mmap)
499 return entry->c.ops->mmap(entry,
500 data->file_private_data,
501 inode, file, vma);
502 break;
503 }
504 return -ENXIO;
505 }
506
507 static const struct file_operations snd_info_entry_operations =
508 {
509 .owner = THIS_MODULE,
510 .llseek = snd_info_entry_llseek,
511 .read = snd_info_entry_read,
512 .write = snd_info_entry_write,
513 .poll = snd_info_entry_poll,
514 .unlocked_ioctl = snd_info_entry_ioctl,
515 .mmap = snd_info_entry_mmap,
516 .open = snd_info_entry_open,
517 .release = snd_info_entry_release,
518 };
519
520 int __init snd_info_init(void)
521 {
522 struct proc_dir_entry *p;
523
524 p = create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, NULL);
525 if (p == NULL)
526 return -ENOMEM;
527 snd_proc_root = p;
528 #ifdef CONFIG_SND_OSSEMUL
529 {
530 struct snd_info_entry *entry;
531 if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL)
532 return -ENOMEM;
533 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
534 if (snd_info_register(entry) < 0) {
535 snd_info_free_entry(entry);
536 return -ENOMEM;
537 }
538 snd_oss_root = entry;
539 }
540 #endif
541 #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
542 {
543 struct snd_info_entry *entry;
544 if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL)
545 return -ENOMEM;
546 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
547 if (snd_info_register(entry) < 0) {
548 snd_info_free_entry(entry);
549 return -ENOMEM;
550 }
551 snd_seq_root = entry;
552 }
553 #endif
554 snd_info_version_init();
555 snd_minor_info_init();
556 snd_minor_info_oss_init();
557 snd_card_info_init();
558 return 0;
559 }
560
561 int __exit snd_info_done(void)
562 {
563 snd_card_info_done();
564 snd_minor_info_oss_done();
565 snd_minor_info_done();
566 snd_info_version_done();
567 if (snd_proc_root) {
568 #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
569 snd_info_free_entry(snd_seq_root);
570 #endif
571 #ifdef CONFIG_SND_OSSEMUL
572 snd_info_free_entry(snd_oss_root);
573 #endif
574 snd_remove_proc_entry(NULL, snd_proc_root);
575 }
576 return 0;
577 }
578
579 /*
580
581 */
582
583
584 /*
585 * create a card proc file
586 * called from init.c
587 */
588 int snd_info_card_create(struct snd_card *card)
589 {
590 char str[8];
591 struct snd_info_entry *entry;
592
593 if (snd_BUG_ON(!card))
594 return -ENXIO;
595
596 sprintf(str, "card%i", card->number);
597 if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL)
598 return -ENOMEM;
599 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
600 if (snd_info_register(entry) < 0) {
601 snd_info_free_entry(entry);
602 return -ENOMEM;
603 }
604 card->proc_root = entry;
605 return 0;
606 }
607
608 /*
609 * register the card proc file
610 * called from init.c
611 */
612 int snd_info_card_register(struct snd_card *card)
613 {
614 struct proc_dir_entry *p;
615
616 if (snd_BUG_ON(!card))
617 return -ENXIO;
618
619 if (!strcmp(card->id, card->proc_root->name))
620 return 0;
621
622 p = proc_symlink(card->id, snd_proc_root, card->proc_root->name);
623 if (p == NULL)
624 return -ENOMEM;
625 card->proc_root_link = p;
626 return 0;
627 }
628
629 /*
630 * called on card->id change
631 */
632 void snd_info_card_id_change(struct snd_card *card)
633 {
634 mutex_lock(&info_mutex);
635 if (card->proc_root_link) {
636 snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
637 card->proc_root_link = NULL;
638 }
639 if (strcmp(card->id, card->proc_root->name))
640 card->proc_root_link = proc_symlink(card->id,
641 snd_proc_root,
642 card->proc_root->name);
643 mutex_unlock(&info_mutex);
644 }
645
646 /*
647 * de-register the card proc file
648 * called from init.c
649 */
650 void snd_info_card_disconnect(struct snd_card *card)
651 {
652 if (!card)
653 return;
654 mutex_lock(&info_mutex);
655 if (card->proc_root_link) {
656 snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
657 card->proc_root_link = NULL;
658 }
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 * Returns 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 (len <= 0 || buffer->stop || buffer->error)
693 return 1;
694 while (--len > 0) {
695 c = buffer->buffer[buffer->curr++];
696 if (c == '\n') {
697 if (buffer->curr >= buffer->size)
698 buffer->stop = 1;
699 break;
700 }
701 *line++ = c;
702 if (buffer->curr >= buffer->size) {
703 buffer->stop = 1;
704 break;
705 }
706 }
707 while (c != '\n' && !buffer->stop) {
708 c = buffer->buffer[buffer->curr++];
709 if (buffer->curr >= buffer->size)
710 buffer->stop = 1;
711 }
712 *line = '\0';
713 return 0;
714 }
715
716 EXPORT_SYMBOL(snd_info_get_line);
717
718 /**
719 * snd_info_get_str - parse a string token
720 * @dest: the buffer to store the string token
721 * @src: the original string
722 * @len: the max. length of token - 1
723 *
724 * Parses the original string and copy a token to the given
725 * string buffer.
726 *
727 * Returns the updated pointer of the original string so that
728 * it can be used for the next call.
729 */
730 char *snd_info_get_str(char *dest, char *src, int len)
731 {
732 int c;
733
734 while (*src == ' ' || *src == '\t')
735 src++;
736 if (*src == '"' || *src == '\'') {
737 c = *src++;
738 while (--len > 0 && *src && *src != c) {
739 *dest++ = *src++;
740 }
741 if (*src == c)
742 src++;
743 } else {
744 while (--len > 0 && *src && *src != ' ' && *src != '\t') {
745 *dest++ = *src++;
746 }
747 }
748 *dest = 0;
749 while (*src == ' ' || *src == '\t')
750 src++;
751 return src;
752 }
753
754 EXPORT_SYMBOL(snd_info_get_str);
755
756 /**
757 * snd_info_create_entry - create an info entry
758 * @name: the proc file name
759 *
760 * Creates an info entry with the given file name and initializes as
761 * the default state.
762 *
763 * Usually called from other functions such as
764 * snd_info_create_card_entry().
765 *
766 * Returns the pointer of the new instance, or NULL on failure.
767 */
768 static struct snd_info_entry *snd_info_create_entry(const char *name)
769 {
770 struct snd_info_entry *entry;
771 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
772 if (entry == NULL)
773 return NULL;
774 entry->name = kstrdup(name, GFP_KERNEL);
775 if (entry->name == NULL) {
776 kfree(entry);
777 return NULL;
778 }
779 entry->mode = S_IFREG | S_IRUGO;
780 entry->content = SNDRV_INFO_CONTENT_TEXT;
781 mutex_init(&entry->access);
782 INIT_LIST_HEAD(&entry->children);
783 INIT_LIST_HEAD(&entry->list);
784 return entry;
785 }
786
787 /**
788 * snd_info_create_module_entry - create an info entry for the given module
789 * @module: the module pointer
790 * @name: the file name
791 * @parent: the parent directory
792 *
793 * Creates a new info entry and assigns it to the given module.
794 *
795 * Returns the pointer of the new instance, or NULL on failure.
796 */
797 struct snd_info_entry *snd_info_create_module_entry(struct module * module,
798 const char *name,
799 struct snd_info_entry *parent)
800 {
801 struct snd_info_entry *entry = snd_info_create_entry(name);
802 if (entry) {
803 entry->module = module;
804 entry->parent = parent;
805 }
806 return entry;
807 }
808
809 EXPORT_SYMBOL(snd_info_create_module_entry);
810
811 /**
812 * snd_info_create_card_entry - create an info entry for the given card
813 * @card: the card instance
814 * @name: the file name
815 * @parent: the parent directory
816 *
817 * Creates a new info entry and assigns it to the given card.
818 *
819 * Returns the pointer of the new instance, or NULL on failure.
820 */
821 struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
822 const char *name,
823 struct snd_info_entry * parent)
824 {
825 struct snd_info_entry *entry = snd_info_create_entry(name);
826 if (entry) {
827 entry->module = card->module;
828 entry->card = card;
829 entry->parent = parent;
830 }
831 return entry;
832 }
833
834 EXPORT_SYMBOL(snd_info_create_card_entry);
835
836 static void snd_info_disconnect(struct snd_info_entry *entry)
837 {
838 struct list_head *p, *n;
839 struct proc_dir_entry *root;
840
841 list_for_each_safe(p, n, &entry->children) {
842 snd_info_disconnect(list_entry(p, struct snd_info_entry, list));
843 }
844
845 if (! entry->p)
846 return;
847 list_del_init(&entry->list);
848 root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
849 snd_BUG_ON(!root);
850 snd_remove_proc_entry(root, entry->p);
851 entry->p = NULL;
852 }
853
854 static int snd_info_dev_free_entry(struct snd_device *device)
855 {
856 struct snd_info_entry *entry = device->device_data;
857 snd_info_free_entry(entry);
858 return 0;
859 }
860
861 static int snd_info_dev_register_entry(struct snd_device *device)
862 {
863 struct snd_info_entry *entry = device->device_data;
864 return snd_info_register(entry);
865 }
866
867 /**
868 * snd_card_proc_new - create an info entry for the given card
869 * @card: the card instance
870 * @name: the file name
871 * @entryp: the pointer to store the new info entry
872 *
873 * Creates a new info entry and assigns it to the given card.
874 * Unlike snd_info_create_card_entry(), this function registers the
875 * info entry as an ALSA device component, so that it can be
876 * unregistered/released without explicit call.
877 * Also, you don't have to register this entry via snd_info_register(),
878 * since this will be registered by snd_card_register() automatically.
879 *
880 * The parent is assumed as card->proc_root.
881 *
882 * For releasing this entry, use snd_device_free() instead of
883 * snd_info_free_entry().
884 *
885 * Returns zero if successful, or a negative error code on failure.
886 */
887 int snd_card_proc_new(struct snd_card *card, const char *name,
888 struct snd_info_entry **entryp)
889 {
890 static struct snd_device_ops ops = {
891 .dev_free = snd_info_dev_free_entry,
892 .dev_register = snd_info_dev_register_entry,
893 /* disconnect is done via snd_info_card_disconnect() */
894 };
895 struct snd_info_entry *entry;
896 int err;
897
898 entry = snd_info_create_card_entry(card, name, card->proc_root);
899 if (! entry)
900 return -ENOMEM;
901 if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) {
902 snd_info_free_entry(entry);
903 return err;
904 }
905 if (entryp)
906 *entryp = entry;
907 return 0;
908 }
909
910 EXPORT_SYMBOL(snd_card_proc_new);
911
912 /**
913 * snd_info_free_entry - release the info entry
914 * @entry: the info entry
915 *
916 * Releases the info entry. Don't call this after registered.
917 */
918 void snd_info_free_entry(struct snd_info_entry * entry)
919 {
920 if (entry == NULL)
921 return;
922 if (entry->p) {
923 mutex_lock(&info_mutex);
924 snd_info_disconnect(entry);
925 mutex_unlock(&info_mutex);
926 }
927 kfree(entry->name);
928 if (entry->private_free)
929 entry->private_free(entry);
930 kfree(entry);
931 }
932
933 EXPORT_SYMBOL(snd_info_free_entry);
934
935 /**
936 * snd_info_register - register the info entry
937 * @entry: the info entry
938 *
939 * Registers the proc info entry.
940 *
941 * Returns zero if successful, or a negative error code on failure.
942 */
943 int snd_info_register(struct snd_info_entry * entry)
944 {
945 struct proc_dir_entry *root, *p = NULL;
946
947 if (snd_BUG_ON(!entry))
948 return -ENXIO;
949 root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
950 mutex_lock(&info_mutex);
951 p = create_proc_entry(entry->name, entry->mode, root);
952 if (!p) {
953 mutex_unlock(&info_mutex);
954 return -ENOMEM;
955 }
956 if (!S_ISDIR(entry->mode))
957 p->proc_fops = &snd_info_entry_operations;
958 p->size = entry->size;
959 p->data = entry;
960 entry->p = p;
961 if (entry->parent)
962 list_add_tail(&entry->list, &entry->parent->children);
963 mutex_unlock(&info_mutex);
964 return 0;
965 }
966
967 EXPORT_SYMBOL(snd_info_register);
968
969 /*
970
971 */
972
973 static struct snd_info_entry *snd_info_version_entry;
974
975 static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
976 {
977 snd_iprintf(buffer,
978 "Advanced Linux Sound Architecture Driver Version "
979 CONFIG_SND_VERSION CONFIG_SND_DATE ".\n"
980 );
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 */
Support for the Chinese Samsung S3C2440 based development boards