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powerpc: clean up bug.h further
[linux-2.6/btrfs-unstable.git] / sound / core / info.c
blob37024d68a26ea25a5358aff96c5c34857fc549d2
1 /*
2 * Information interface for ALSA driver
3 * Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
23 #include <linux/init.h>
24 #include <linux/vmalloc.h>
25 #include <linux/time.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/devfs_fs_kernel.h>
34 #include <stdarg.h>
35
36 /*
37 *
38 */
39
40 int snd_info_check_reserved_words(const char *str)
41 {
42 static char *reserved[] =
43 {
44 "version",
45 "meminfo",
46 "memdebug",
47 "detect",
48 "devices",
49 "oss",
50 "cards",
51 "timers",
52 "synth",
53 "pcm",
54 "seq",
55 NULL
56 };
57 char **xstr = reserved;
58
59 while (*xstr) {
60 if (!strcmp(*xstr, str))
61 return 0;
62 xstr++;
63 }
64 if (!strncmp(str, "card", 4))
65 return 0;
66 return 1;
67 }
68
69 #ifdef CONFIG_PROC_FS
70
71 static DECLARE_MUTEX(info_mutex);
72
73 typedef struct _snd_info_private_data {
74 snd_info_buffer_t *rbuffer;
75 snd_info_buffer_t *wbuffer;
76 snd_info_entry_t *entry;
77 void *file_private_data;
78 } snd_info_private_data_t;
79
80 static int snd_info_version_init(void);
81 static int snd_info_version_done(void);
82
83
84 /**
85 * snd_iprintf - printf on the procfs buffer
86 * @buffer: the procfs buffer
87 * @fmt: the printf format
88 *
89 * Outputs the string on the procfs buffer just like printf().
90 *
91 * Returns the size of output string.
92 */
93 int snd_iprintf(snd_info_buffer_t * buffer, char *fmt,...)
94 {
95 va_list args;
96 int len, res;
97
98 if (buffer->stop || buffer->error)
99 return 0;
100 len = buffer->len - buffer->size;
101 va_start(args, fmt);
102 res = vsnprintf(buffer->curr, len, fmt, args);
103 va_end(args);
104 if (res >= len) {
105 buffer->stop = 1;
106 return 0;
107 }
108 buffer->curr += res;
109 buffer->size += res;
110 return res;
111 }
112
113 /*
114
115 */
116
117 static struct proc_dir_entry *snd_proc_root = NULL;
118 snd_info_entry_t *snd_seq_root = NULL;
119 #ifdef CONFIG_SND_OSSEMUL
120 snd_info_entry_t *snd_oss_root = NULL;
121 #endif
122
123 static inline void snd_info_entry_prepare(struct proc_dir_entry *de)
124 {
125 de->owner = THIS_MODULE;
126 }
127
128 static void snd_remove_proc_entry(struct proc_dir_entry *parent,
129 struct proc_dir_entry *de)
130 {
131 if (de)
132 remove_proc_entry(de->name, parent);
133 }
134
135 static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
136 {
137 snd_info_private_data_t *data;
138 struct snd_info_entry *entry;
139 loff_t ret;
140
141 data = file->private_data;
142 entry = data->entry;
143 lock_kernel();
144 switch (entry->content) {
145 case SNDRV_INFO_CONTENT_TEXT:
146 switch (orig) {
147 case 0: /* SEEK_SET */
148 file->f_pos = offset;
149 ret = file->f_pos;
150 goto out;
151 case 1: /* SEEK_CUR */
152 file->f_pos += offset;
153 ret = file->f_pos;
154 goto out;
155 case 2: /* SEEK_END */
156 default:
157 ret = -EINVAL;
158 goto out;
159 }
160 break;
161 case SNDRV_INFO_CONTENT_DATA:
162 if (entry->c.ops->llseek) {
163 ret = entry->c.ops->llseek(entry,
164 data->file_private_data,
165 file, offset, orig);
166 goto out;
167 }
168 break;
169 }
170 ret = -ENXIO;
171 out:
172 unlock_kernel();
173 return ret;
174 }
175
176 static ssize_t snd_info_entry_read(struct file *file, char __user *buffer,
177 size_t count, loff_t * offset)
178 {
179 snd_info_private_data_t *data;
180 struct snd_info_entry *entry;
181 snd_info_buffer_t *buf;
182 size_t size = 0;
183 loff_t pos;
184
185 data = file->private_data;
186 snd_assert(data != NULL, return -ENXIO);
187 pos = *offset;
188 if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
189 return -EIO;
190 if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
191 return -EIO;
192 entry = data->entry;
193 switch (entry->content) {
194 case SNDRV_INFO_CONTENT_TEXT:
195 buf = data->rbuffer;
196 if (buf == NULL)
197 return -EIO;
198 if (pos >= buf->size)
199 return 0;
200 size = buf->size - pos;
201 size = min(count, size);
202 if (copy_to_user(buffer, buf->buffer + pos, size))
203 return -EFAULT;
204 break;
205 case SNDRV_INFO_CONTENT_DATA:
206 if (entry->c.ops->read)
207 size = entry->c.ops->read(entry,
208 data->file_private_data,
209 file, buffer, count, pos);
210 break;
211 }
212 if ((ssize_t) size > 0)
213 *offset = pos + size;
214 return size;
215 }
216
217 static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer,
218 size_t count, loff_t * offset)
219 {
220 snd_info_private_data_t *data;
221 struct snd_info_entry *entry;
222 snd_info_buffer_t *buf;
223 size_t size = 0;
224 loff_t pos;
225
226 data = file->private_data;
227 snd_assert(data != NULL, return -ENXIO);
228 entry = data->entry;
229 pos = *offset;
230 if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
231 return -EIO;
232 if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
233 return -EIO;
234 switch (entry->content) {
235 case SNDRV_INFO_CONTENT_TEXT:
236 buf = data->wbuffer;
237 if (buf == NULL)
238 return -EIO;
239 if (pos >= buf->len)
240 return -ENOMEM;
241 size = buf->len - pos;
242 size = min(count, size);
243 if (copy_from_user(buf->buffer + pos, buffer, size))
244 return -EFAULT;
245 if ((long)buf->size < pos + size)
246 buf->size = pos + size;
247 break;
248 case SNDRV_INFO_CONTENT_DATA:
249 if (entry->c.ops->write)
250 size = entry->c.ops->write(entry,
251 data->file_private_data,
252 file, buffer, count, pos);
253 break;
254 }
255 if ((ssize_t) size > 0)
256 *offset = pos + size;
257 return size;
258 }
259
260 static int snd_info_entry_open(struct inode *inode, struct file *file)
261 {
262 snd_info_entry_t *entry;
263 snd_info_private_data_t *data;
264 snd_info_buffer_t *buffer;
265 struct proc_dir_entry *p;
266 int mode, err;
267
268 down(&info_mutex);
269 p = PDE(inode);
270 entry = p == NULL ? NULL : (snd_info_entry_t *)p->data;
271 if (entry == NULL || entry->disconnected) {
272 up(&info_mutex);
273 return -ENODEV;
274 }
275 if (!try_module_get(entry->module)) {
276 err = -EFAULT;
277 goto __error1;
278 }
279 mode = file->f_flags & O_ACCMODE;
280 if (mode == O_RDONLY || mode == O_RDWR) {
281 if ((entry->content == SNDRV_INFO_CONTENT_TEXT &&
282 !entry->c.text.read_size) ||
283 (entry->content == SNDRV_INFO_CONTENT_DATA &&
284 entry->c.ops->read == NULL)) {
285 err = -ENODEV;
286 goto __error;
287 }
288 }
289 if (mode == O_WRONLY || mode == O_RDWR) {
290 if ((entry->content == SNDRV_INFO_CONTENT_TEXT &&
291 !entry->c.text.write_size) ||
292 (entry->content == SNDRV_INFO_CONTENT_DATA &&
293 entry->c.ops->write == NULL)) {
294 err = -ENODEV;
295 goto __error;
296 }
297 }
298 data = kzalloc(sizeof(*data), GFP_KERNEL);
299 if (data == NULL) {
300 err = -ENOMEM;
301 goto __error;
302 }
303 data->entry = entry;
304 switch (entry->content) {
305 case SNDRV_INFO_CONTENT_TEXT:
306 if (mode == O_RDONLY || mode == O_RDWR) {
307 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
308 if (buffer == NULL) {
309 kfree(data);
310 err = -ENOMEM;
311 goto __error;
312 }
313 buffer->len = (entry->c.text.read_size +
314 (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
315 buffer->buffer = vmalloc(buffer->len);
316 if (buffer->buffer == NULL) {
317 kfree(buffer);
318 kfree(data);
319 err = -ENOMEM;
320 goto __error;
321 }
322 buffer->curr = buffer->buffer;
323 data->rbuffer = buffer;
324 }
325 if (mode == O_WRONLY || mode == O_RDWR) {
326 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
327 if (buffer == NULL) {
328 if (mode == O_RDWR) {
329 vfree(data->rbuffer->buffer);
330 kfree(data->rbuffer);
331 }
332 kfree(data);
333 err = -ENOMEM;
334 goto __error;
335 }
336 buffer->len = (entry->c.text.write_size +
337 (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
338 buffer->buffer = vmalloc(buffer->len);
339 if (buffer->buffer == NULL) {
340 if (mode == O_RDWR) {
341 vfree(data->rbuffer->buffer);
342 kfree(data->rbuffer);
343 }
344 kfree(buffer);
345 kfree(data);
346 err = -ENOMEM;
347 goto __error;
348 }
349 buffer->curr = buffer->buffer;
350 data->wbuffer = buffer;
351 }
352 break;
353 case SNDRV_INFO_CONTENT_DATA: /* data */
354 if (entry->c.ops->open) {
355 if ((err = entry->c.ops->open(entry, mode,
356 &data->file_private_data)) < 0) {
357 kfree(data);
358 goto __error;
359 }
360 }
361 break;
362 }
363 file->private_data = data;
364 up(&info_mutex);
365 if (entry->content == SNDRV_INFO_CONTENT_TEXT &&
366 (mode == O_RDONLY || mode == O_RDWR)) {
367 if (entry->c.text.read) {
368 down(&entry->access);
369 entry->c.text.read(entry, data->rbuffer);
370 up(&entry->access);
371 }
372 }
373 return 0;
374
375 __error:
376 module_put(entry->module);
377 __error1:
378 up(&info_mutex);
379 return err;
380 }
381
382 static int snd_info_entry_release(struct inode *inode, struct file *file)
383 {
384 snd_info_entry_t *entry;
385 snd_info_private_data_t *data;
386 int mode;
387
388 mode = file->f_flags & O_ACCMODE;
389 data = file->private_data;
390 entry = data->entry;
391 switch (entry->content) {
392 case SNDRV_INFO_CONTENT_TEXT:
393 if (mode == O_RDONLY || mode == O_RDWR) {
394 vfree(data->rbuffer->buffer);
395 kfree(data->rbuffer);
396 }
397 if (mode == O_WRONLY || mode == O_RDWR) {
398 if (entry->c.text.write) {
399 entry->c.text.write(entry, data->wbuffer);
400 if (data->wbuffer->error) {
401 snd_printk(KERN_WARNING "data write error to %s (%i)\n",
402 entry->name,
403 data->wbuffer->error);
404 }
405 }
406 vfree(data->wbuffer->buffer);
407 kfree(data->wbuffer);
408 }
409 break;
410 case SNDRV_INFO_CONTENT_DATA:
411 if (entry->c.ops->release)
412 entry->c.ops->release(entry, mode,
413 data->file_private_data);
414 break;
415 }
416 module_put(entry->module);
417 kfree(data);
418 return 0;
419 }
420
421 static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait)
422 {
423 snd_info_private_data_t *data;
424 struct snd_info_entry *entry;
425 unsigned int mask;
426
427 data = file->private_data;
428 if (data == NULL)
429 return 0;
430 entry = data->entry;
431 mask = 0;
432 switch (entry->content) {
433 case SNDRV_INFO_CONTENT_DATA:
434 if (entry->c.ops->poll)
435 return entry->c.ops->poll(entry,
436 data->file_private_data,
437 file, wait);
438 if (entry->c.ops->read)
439 mask |= POLLIN | POLLRDNORM;
440 if (entry->c.ops->write)
441 mask |= POLLOUT | POLLWRNORM;
442 break;
443 }
444 return mask;
445 }
446
447 static inline int _snd_info_entry_ioctl(struct inode *inode, struct file *file,
448 unsigned int cmd, unsigned long arg)
449 {
450 snd_info_private_data_t *data;
451 struct snd_info_entry *entry;
452
453 data = file->private_data;
454 if (data == NULL)
455 return 0;
456 entry = data->entry;
457 switch (entry->content) {
458 case SNDRV_INFO_CONTENT_DATA:
459 if (entry->c.ops->ioctl)
460 return entry->c.ops->ioctl(entry,
461 data->file_private_data,
462 file, cmd, arg);
463 break;
464 }
465 return -ENOTTY;
466 }
467
468 /* FIXME: need to unlock BKL to allow preemption */
469 static int snd_info_entry_ioctl(struct inode *inode, struct file *file,
470 unsigned int cmd, unsigned long arg)
471 {
472 int err;
473 unlock_kernel();
474 err = _snd_info_entry_ioctl(inode, file, cmd, arg);
475 lock_kernel();
476 return err;
477 }
478
479 static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma)
480 {
481 struct inode *inode = file->f_dentry->d_inode;
482 snd_info_private_data_t *data;
483 struct snd_info_entry *entry;
484
485 data = file->private_data;
486 if (data == NULL)
487 return 0;
488 entry = data->entry;
489 switch (entry->content) {
490 case SNDRV_INFO_CONTENT_DATA:
491 if (entry->c.ops->mmap)
492 return entry->c.ops->mmap(entry,
493 data->file_private_data,
494 inode, file, vma);
495 break;
496 }
497 return -ENXIO;
498 }
499
500 static struct file_operations snd_info_entry_operations =
501 {
502 .owner = THIS_MODULE,
503 .llseek = snd_info_entry_llseek,
504 .read = snd_info_entry_read,
505 .write = snd_info_entry_write,
506 .poll = snd_info_entry_poll,
507 .ioctl = snd_info_entry_ioctl,
508 .mmap = snd_info_entry_mmap,
509 .open = snd_info_entry_open,
510 .release = snd_info_entry_release,
511 };
512
513 /**
514 * snd_create_proc_entry - create a procfs entry
515 * @name: the name of the proc file
516 * @mode: the file permission bits, S_Ixxx
517 * @parent: the parent proc-directory entry
518 *
519 * Creates a new proc file entry with the given name and permission
520 * on the given directory.
521 *
522 * Returns the pointer of new instance or NULL on failure.
523 */
524 static struct proc_dir_entry *snd_create_proc_entry(const char *name, mode_t mode,
525 struct proc_dir_entry *parent)
526 {
527 struct proc_dir_entry *p;
528 p = create_proc_entry(name, mode, parent);
529 if (p)
530 snd_info_entry_prepare(p);
531 return p;
532 }
533
534 int __init snd_info_init(void)
535 {
536 struct proc_dir_entry *p;
537
538 p = snd_create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, &proc_root);
539 if (p == NULL)
540 return -ENOMEM;
541 snd_proc_root = p;
542 #ifdef CONFIG_SND_OSSEMUL
543 {
544 snd_info_entry_t *entry;
545 if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL)
546 return -ENOMEM;
547 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
548 if (snd_info_register(entry) < 0) {
549 snd_info_free_entry(entry);
550 return -ENOMEM;
551 }
552 snd_oss_root = entry;
553 }
554 #endif
555 #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
556 {
557 snd_info_entry_t *entry;
558 if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL)
559 return -ENOMEM;
560 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
561 if (snd_info_register(entry) < 0) {
562 snd_info_free_entry(entry);
563 return -ENOMEM;
564 }
565 snd_seq_root = entry;
566 }
567 #endif
568 snd_info_version_init();
569 snd_memory_info_init();
570 snd_minor_info_init();
571 snd_minor_info_oss_init();
572 snd_card_info_init();
573 return 0;
574 }
575
576 int __exit snd_info_done(void)
577 {
578 snd_card_info_done();
579 snd_minor_info_oss_done();
580 snd_minor_info_done();
581 snd_memory_info_done();
582 snd_info_version_done();
583 if (snd_proc_root) {
584 #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
585 if (snd_seq_root)
586 snd_info_unregister(snd_seq_root);
587 #endif
588 #ifdef CONFIG_SND_OSSEMUL
589 if (snd_oss_root)
590 snd_info_unregister(snd_oss_root);
591 #endif
592 snd_remove_proc_entry(&proc_root, snd_proc_root);
593 }
594 return 0;
595 }
596
597 /*
598
599 */
600
601
602 /*
603 * create a card proc file
604 * called from init.c
605 */
606 int snd_info_card_create(snd_card_t * card)
607 {
608 char str[8];
609 snd_info_entry_t *entry;
610
611 snd_assert(card != NULL, return -ENXIO);
612
613 sprintf(str, "card%i", card->number);
614 if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL)
615 return -ENOMEM;
616 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
617 if (snd_info_register(entry) < 0) {
618 snd_info_free_entry(entry);
619 return -ENOMEM;
620 }
621 card->proc_root = entry;
622 return 0;
623 }
624
625 /*
626 * register the card proc file
627 * called from init.c
628 */
629 int snd_info_card_register(snd_card_t * card)
630 {
631 struct proc_dir_entry *p;
632
633 snd_assert(card != NULL, return -ENXIO);
634
635 if (!strcmp(card->id, card->proc_root->name))
636 return 0;
637
638 p = proc_symlink(card->id, snd_proc_root, card->proc_root->name);
639 if (p == NULL)
640 return -ENOMEM;
641 card->proc_root_link = p;
642 return 0;
643 }
644
645 /*
646 * de-register the card proc file
647 * called from init.c
648 */
649 int snd_info_card_free(snd_card_t * card)
650 {
651 snd_assert(card != NULL, return -ENXIO);
652 if (card->proc_root_link) {
653 snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
654 card->proc_root_link = NULL;
655 }
656 if (card->proc_root) {
657 snd_info_unregister(card->proc_root);
658 card->proc_root = NULL;
659 }
660 return 0;
661 }
662
663
664 /**
665 * snd_info_get_line - read one line from the procfs buffer
666 * @buffer: the procfs buffer
667 * @line: the buffer to store
668 * @len: the max. buffer size - 1
669 *
670 * Reads one line from the buffer and stores the string.
671 *
672 * Returns zero if successful, or 1 if error or EOF.
673 */
674 int snd_info_get_line(snd_info_buffer_t * buffer, char *line, int len)
675 {
676 int c = -1;
677
678 if (len <= 0 || buffer->stop || buffer->error)
679 return 1;
680 while (--len > 0) {
681 c = *buffer->curr++;
682 if (c == '\n') {
683 if ((buffer->curr - buffer->buffer) >= (long)buffer->size) {
684 buffer->stop = 1;
685 }
686 break;
687 }
688 *line++ = c;
689 if ((buffer->curr - buffer->buffer) >= (long)buffer->size) {
690 buffer->stop = 1;
691 break;
692 }
693 }
694 while (c != '\n' && !buffer->stop) {
695 c = *buffer->curr++;
696 if ((buffer->curr - buffer->buffer) >= (long)buffer->size) {
697 buffer->stop = 1;
698 }
699 }
700 *line = '\0';
701 return 0;
702 }
703
704 /**
705 * snd_info_get_str - parse a string token
706 * @dest: the buffer to store the string token
707 * @src: the original string
708 * @len: the max. length of token - 1
709 *
710 * Parses the original string and copy a token to the given
711 * string buffer.
712 *
713 * Returns the updated pointer of the original string so that
714 * it can be used for the next call.
715 */
716 char *snd_info_get_str(char *dest, char *src, int len)
717 {
718 int c;
719
720 while (*src == ' ' || *src == '\t')
721 src++;
722 if (*src == '"' || *src == '\'') {
723 c = *src++;
724 while (--len > 0 && *src && *src != c) {
725 *dest++ = *src++;
726 }
727 if (*src == c)
728 src++;
729 } else {
730 while (--len > 0 && *src && *src != ' ' && *src != '\t') {
731 *dest++ = *src++;
732 }
733 }
734 *dest = 0;
735 while (*src == ' ' || *src == '\t')
736 src++;
737 return src;
738 }
739
740 /**
741 * snd_info_create_entry - create an info entry
742 * @name: the proc file name
743 *
744 * Creates an info entry with the given file name and initializes as
745 * the default state.
746 *
747 * Usually called from other functions such as
748 * snd_info_create_card_entry().
749 *
750 * Returns the pointer of the new instance, or NULL on failure.
751 */
752 static snd_info_entry_t *snd_info_create_entry(const char *name)
753 {
754 snd_info_entry_t *entry;
755 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
756 if (entry == NULL)
757 return NULL;
758 entry->name = kstrdup(name, GFP_KERNEL);
759 if (entry->name == NULL) {
760 kfree(entry);
761 return NULL;
762 }
763 entry->mode = S_IFREG | S_IRUGO;
764 entry->content = SNDRV_INFO_CONTENT_TEXT;
765 init_MUTEX(&entry->access);
766 return entry;
767 }
768
769 /**
770 * snd_info_create_module_entry - create an info entry for the given module
771 * @module: the module pointer
772 * @name: the file name
773 * @parent: the parent directory
774 *
775 * Creates a new info entry and assigns it to the given module.
776 *
777 * Returns the pointer of the new instance, or NULL on failure.
778 */
779 snd_info_entry_t *snd_info_create_module_entry(struct module * module,
780 const char *name,
781 snd_info_entry_t *parent)
782 {
783 snd_info_entry_t *entry = snd_info_create_entry(name);
784 if (entry) {
785 entry->module = module;
786 entry->parent = parent;
787 }
788 return entry;
789 }
790
791 /**
792 * snd_info_create_card_entry - create an info entry for the given card
793 * @card: the card instance
794 * @name: the file name
795 * @parent: the parent directory
796 *
797 * Creates a new info entry and assigns it to the given card.
798 *
799 * Returns the pointer of the new instance, or NULL on failure.
800 */
801 snd_info_entry_t *snd_info_create_card_entry(snd_card_t * card,
802 const char *name,
803 snd_info_entry_t * parent)
804 {
805 snd_info_entry_t *entry = snd_info_create_entry(name);
806 if (entry) {
807 entry->module = card->module;
808 entry->card = card;
809 entry->parent = parent;
810 }
811 return entry;
812 }
813
814 static int snd_info_dev_free_entry(snd_device_t *device)
815 {
816 snd_info_entry_t *entry = device->device_data;
817 snd_info_free_entry(entry);
818 return 0;
819 }
820
821 static int snd_info_dev_register_entry(snd_device_t *device)
822 {
823 snd_info_entry_t *entry = device->device_data;
824 return snd_info_register(entry);
825 }
826
827 static int snd_info_dev_disconnect_entry(snd_device_t *device)
828 {
829 snd_info_entry_t *entry = device->device_data;
830 entry->disconnected = 1;
831 return 0;
832 }
833
834 static int snd_info_dev_unregister_entry(snd_device_t *device)
835 {
836 snd_info_entry_t *entry = device->device_data;
837 return snd_info_unregister(entry);
838 }
839
840 /**
841 * snd_card_proc_new - create an info entry for the given card
842 * @card: the card instance
843 * @name: the file name
844 * @entryp: the pointer to store the new info entry
845 *
846 * Creates a new info entry and assigns it to the given card.
847 * Unlike snd_info_create_card_entry(), this function registers the
848 * info entry as an ALSA device component, so that it can be
849 * unregistered/released without explicit call.
850 * Also, you don't have to register this entry via snd_info_register(),
851 * since this will be registered by snd_card_register() automatically.
852 *
853 * The parent is assumed as card->proc_root.
854 *
855 * For releasing this entry, use snd_device_free() instead of
856 * snd_info_free_entry().
857 *
858 * Returns zero if successful, or a negative error code on failure.
859 */
860 int snd_card_proc_new(snd_card_t *card, const char *name,
861 snd_info_entry_t **entryp)
862 {
863 static snd_device_ops_t ops = {
864 .dev_free = snd_info_dev_free_entry,
865 .dev_register = snd_info_dev_register_entry,
866 .dev_disconnect = snd_info_dev_disconnect_entry,
867 .dev_unregister = snd_info_dev_unregister_entry
868 };
869 snd_info_entry_t *entry;
870 int err;
871
872 entry = snd_info_create_card_entry(card, name, card->proc_root);
873 if (! entry)
874 return -ENOMEM;
875 if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) {
876 snd_info_free_entry(entry);
877 return err;
878 }
879 if (entryp)
880 *entryp = entry;
881 return 0;
882 }
883
884 /**
885 * snd_info_free_entry - release the info entry
886 * @entry: the info entry
887 *
888 * Releases the info entry. Don't call this after registered.
889 */
890 void snd_info_free_entry(snd_info_entry_t * entry)
891 {
892 if (entry == NULL)
893 return;
894 kfree(entry->name);
895 if (entry->private_free)
896 entry->private_free(entry);
897 kfree(entry);
898 }
899
900 /**
901 * snd_info_register - register the info entry
902 * @entry: the info entry
903 *
904 * Registers the proc info entry.
905 *
906 * Returns zero if successful, or a negative error code on failure.
907 */
908 int snd_info_register(snd_info_entry_t * entry)
909 {
910 struct proc_dir_entry *root, *p = NULL;
911
912 snd_assert(entry != NULL, return -ENXIO);
913 root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
914 down(&info_mutex);
915 p = snd_create_proc_entry(entry->name, entry->mode, root);
916 if (!p) {
917 up(&info_mutex);
918 return -ENOMEM;
919 }
920 p->owner = entry->module;
921 if (!S_ISDIR(entry->mode))
922 p->proc_fops = &snd_info_entry_operations;
923 p->size = entry->size;
924 p->data = entry;
925 entry->p = p;
926 up(&info_mutex);
927 return 0;
928 }
929
930 /**
931 * snd_info_unregister - de-register the info entry
932 * @entry: the info entry
933 *
934 * De-registers the info entry and releases the instance.
935 *
936 * Returns zero if successful, or a negative error code on failure.
937 */
938 int snd_info_unregister(snd_info_entry_t * entry)
939 {
940 struct proc_dir_entry *root;
941
942 snd_assert(entry != NULL, return -ENXIO);
943 snd_assert(entry->p != NULL, return -ENXIO);
944 root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
945 snd_assert(root, return -ENXIO);
946 down(&info_mutex);
947 snd_remove_proc_entry(root, entry->p);
948 up(&info_mutex);
949 snd_info_free_entry(entry);
950 return 0;
951 }
952
953 /*
954
955 */
956
957 static snd_info_entry_t *snd_info_version_entry = NULL;
958
959 static void snd_info_version_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
960 {
961 snd_iprintf(buffer,
962 "Advanced Linux Sound Architecture Driver Version "
963 CONFIG_SND_VERSION CONFIG_SND_DATE ".\n"
964 );
965 }
966
967 static int __init snd_info_version_init(void)
968 {
969 snd_info_entry_t *entry;
970
971 entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL);
972 if (entry == NULL)
973 return -ENOMEM;
974 entry->c.text.read_size = 256;
975 entry->c.text.read = snd_info_version_read;
976 if (snd_info_register(entry) < 0) {
977 snd_info_free_entry(entry);
978 return -ENOMEM;
979 }
980 snd_info_version_entry = entry;
981 return 0;
982 }
983
984 static int __exit snd_info_version_done(void)
985 {
986 if (snd_info_version_entry)
987 snd_info_unregister(snd_info_version_entry);
988 return 0;
989 }
990
991 #endif /* CONFIG_PROC_FS */
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