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[NET] Generalise TCP's struct open_request minisock infrastructure
[linux-2.6/x86.git] / sound / core / info.c
blob31faffe01cb0fde0a4c73834cb69ad2c464954dc
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 <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/devfs_fs_kernel.h>
33 #include <stdarg.h>
34
35 /*
36 *
37 */
38
39 int snd_info_check_reserved_words(const char *str)
40 {
41 static char *reserved[] =
42 {
43 "version",
44 "meminfo",
45 "memdebug",
46 "detect",
47 "devices",
48 "oss",
49 "cards",
50 "timers",
51 "synth",
52 "pcm",
53 "seq",
54 NULL
55 };
56 char **xstr = reserved;
57
58 while (*xstr) {
59 if (!strcmp(*xstr, str))
60 return 0;
61 xstr++;
62 }
63 if (!strncmp(str, "card", 4))
64 return 0;
65 return 1;
66 }
67
68 #ifdef CONFIG_PROC_FS
69
70 static DECLARE_MUTEX(info_mutex);
71
72 typedef struct _snd_info_private_data {
73 snd_info_buffer_t *rbuffer;
74 snd_info_buffer_t *wbuffer;
75 snd_info_entry_t *entry;
76 void *file_private_data;
77 } snd_info_private_data_t;
78
79 static int snd_info_version_init(void);
80 static int snd_info_version_done(void);
81
82
83 /**
84 * snd_iprintf - printf on the procfs buffer
85 * @buffer: the procfs buffer
86 * @fmt: the printf format
87 *
88 * Outputs the string on the procfs buffer just like printf().
89 *
90 * Returns the size of output string.
91 */
92 int snd_iprintf(snd_info_buffer_t * buffer, char *fmt,...)
93 {
94 va_list args;
95 int len, res;
96
97 if (buffer->stop || buffer->error)
98 return 0;
99 len = buffer->len - buffer->size;
100 va_start(args, fmt);
101 res = vsnprintf(buffer->curr, len, fmt, args);
102 va_end(args);
103 if (res >= len) {
104 buffer->stop = 1;
105 return 0;
106 }
107 buffer->curr += res;
108 buffer->size += res;
109 return res;
110 }
111
112 /*
113
114 */
115
116 static struct proc_dir_entry *snd_proc_root = NULL;
117 snd_info_entry_t *snd_seq_root = NULL;
118 #ifdef CONFIG_SND_OSSEMUL
119 snd_info_entry_t *snd_oss_root = NULL;
120 #endif
121
122 static inline void snd_info_entry_prepare(struct proc_dir_entry *de)
123 {
124 de->owner = THIS_MODULE;
125 }
126
127 static void snd_remove_proc_entry(struct proc_dir_entry *parent,
128 struct proc_dir_entry *de)
129 {
130 if (de)
131 remove_proc_entry(de->name, parent);
132 }
133
134 static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
135 {
136 snd_info_private_data_t *data;
137 struct snd_info_entry *entry;
138 loff_t ret;
139
140 data = file->private_data;
141 entry = data->entry;
142 lock_kernel();
143 switch (entry->content) {
144 case SNDRV_INFO_CONTENT_TEXT:
145 switch (orig) {
146 case 0: /* SEEK_SET */
147 file->f_pos = offset;
148 ret = file->f_pos;
149 goto out;
150 case 1: /* SEEK_CUR */
151 file->f_pos += offset;
152 ret = file->f_pos;
153 goto out;
154 case 2: /* SEEK_END */
155 default:
156 ret = -EINVAL;
157 goto out;
158 }
159 break;
160 case SNDRV_INFO_CONTENT_DATA:
161 if (entry->c.ops->llseek) {
162 ret = entry->c.ops->llseek(entry,
163 data->file_private_data,
164 file, offset, orig);
165 goto out;
166 }
167 break;
168 }
169 ret = -ENXIO;
170 out:
171 unlock_kernel();
172 return ret;
173 }
174
175 static ssize_t snd_info_entry_read(struct file *file, char __user *buffer,
176 size_t count, loff_t * offset)
177 {
178 snd_info_private_data_t *data;
179 struct snd_info_entry *entry;
180 snd_info_buffer_t *buf;
181 size_t size = 0;
182 loff_t pos;
183
184 data = file->private_data;
185 snd_assert(data != NULL, return -ENXIO);
186 pos = *offset;
187 if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
188 return -EIO;
189 if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
190 return -EIO;
191 entry = data->entry;
192 switch (entry->content) {
193 case SNDRV_INFO_CONTENT_TEXT:
194 buf = data->rbuffer;
195 if (buf == NULL)
196 return -EIO;
197 if (pos >= buf->size)
198 return 0;
199 size = buf->size - pos;
200 size = min(count, size);
201 if (copy_to_user(buffer, buf->buffer + pos, size))
202 return -EFAULT;
203 break;
204 case SNDRV_INFO_CONTENT_DATA:
205 if (entry->c.ops->read)
206 size = entry->c.ops->read(entry,
207 data->file_private_data,
208 file, buffer, count, pos);
209 break;
210 }
211 if ((ssize_t) size > 0)
212 *offset = pos + size;
213 return size;
214 }
215
216 static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer,
217 size_t count, loff_t * offset)
218 {
219 snd_info_private_data_t *data;
220 struct snd_info_entry *entry;
221 snd_info_buffer_t *buf;
222 size_t size = 0;
223 loff_t pos;
224
225 data = file->private_data;
226 snd_assert(data != NULL, return -ENXIO);
227 entry = data->entry;
228 pos = *offset;
229 if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
230 return -EIO;
231 if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
232 return -EIO;
233 switch (entry->content) {
234 case SNDRV_INFO_CONTENT_TEXT:
235 buf = data->wbuffer;
236 if (buf == NULL)
237 return -EIO;
238 if (pos >= buf->len)
239 return -ENOMEM;
240 size = buf->len - pos;
241 size = min(count, size);
242 if (copy_from_user(buf->buffer + pos, buffer, size))
243 return -EFAULT;
244 if ((long)buf->size < pos + size)
245 buf->size = pos + size;
246 break;
247 case SNDRV_INFO_CONTENT_DATA:
248 if (entry->c.ops->write)
249 size = entry->c.ops->write(entry,
250 data->file_private_data,
251 file, buffer, count, pos);
252 break;
253 }
254 if ((ssize_t) size > 0)
255 *offset = pos + size;
256 return size;
257 }
258
259 static int snd_info_entry_open(struct inode *inode, struct file *file)
260 {
261 snd_info_entry_t *entry;
262 snd_info_private_data_t *data;
263 snd_info_buffer_t *buffer;
264 struct proc_dir_entry *p;
265 int mode, err;
266
267 down(&info_mutex);
268 p = PDE(inode);
269 entry = p == NULL ? NULL : (snd_info_entry_t *)p->data;
270 if (entry == NULL || entry->disconnected) {
271 up(&info_mutex);
272 return -ENODEV;
273 }
274 if (!try_module_get(entry->module)) {
275 err = -EFAULT;
276 goto __error1;
277 }
278 mode = file->f_flags & O_ACCMODE;
279 if (mode == O_RDONLY || mode == O_RDWR) {
280 if ((entry->content == SNDRV_INFO_CONTENT_TEXT &&
281 !entry->c.text.read_size) ||
282 (entry->content == SNDRV_INFO_CONTENT_DATA &&
283 entry->c.ops->read == NULL)) {
284 err = -ENODEV;
285 goto __error;
286 }
287 }
288 if (mode == O_WRONLY || mode == O_RDWR) {
289 if ((entry->content == SNDRV_INFO_CONTENT_TEXT &&
290 !entry->c.text.write_size) ||
291 (entry->content == SNDRV_INFO_CONTENT_DATA &&
292 entry->c.ops->write == NULL)) {
293 err = -ENODEV;
294 goto __error;
295 }
296 }
297 data = kcalloc(1, sizeof(*data), GFP_KERNEL);
298 if (data == NULL) {
299 err = -ENOMEM;
300 goto __error;
301 }
302 data->entry = entry;
303 switch (entry->content) {
304 case SNDRV_INFO_CONTENT_TEXT:
305 if (mode == O_RDONLY || mode == O_RDWR) {
306 buffer = kcalloc(1, sizeof(*buffer), GFP_KERNEL);
307 if (buffer == NULL) {
308 kfree(data);
309 err = -ENOMEM;
310 goto __error;
311 }
312 buffer->len = (entry->c.text.read_size +
313 (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
314 buffer->buffer = vmalloc(buffer->len);
315 if (buffer->buffer == NULL) {
316 kfree(buffer);
317 kfree(data);
318 err = -ENOMEM;
319 goto __error;
320 }
321 buffer->curr = buffer->buffer;
322 data->rbuffer = buffer;
323 }
324 if (mode == O_WRONLY || mode == O_RDWR) {
325 buffer = kcalloc(1, sizeof(*buffer), GFP_KERNEL);
326 if (buffer == NULL) {
327 if (mode == O_RDWR) {
328 vfree(data->rbuffer->buffer);
329 kfree(data->rbuffer);
330 }
331 kfree(data);
332 err = -ENOMEM;
333 goto __error;
334 }
335 buffer->len = (entry->c.text.write_size +
336 (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
337 buffer->buffer = vmalloc(buffer->len);
338 if (buffer->buffer == NULL) {
339 if (mode == O_RDWR) {
340 vfree(data->rbuffer->buffer);
341 kfree(data->rbuffer);
342 }
343 kfree(buffer);
344 kfree(data);
345 err = -ENOMEM;
346 goto __error;
347 }
348 buffer->curr = buffer->buffer;
349 data->wbuffer = buffer;
350 }
351 break;
352 case SNDRV_INFO_CONTENT_DATA: /* data */
353 if (entry->c.ops->open) {
354 if ((err = entry->c.ops->open(entry, mode,
355 &data->file_private_data)) < 0) {
356 kfree(data);
357 goto __error;
358 }
359 }
360 break;
361 }
362 file->private_data = data;
363 up(&info_mutex);
364 if (entry->content == SNDRV_INFO_CONTENT_TEXT &&
365 (mode == O_RDONLY || mode == O_RDWR)) {
366 if (entry->c.text.read) {
367 down(&entry->access);
368 entry->c.text.read(entry, data->rbuffer);
369 up(&entry->access);
370 }
371 }
372 return 0;
373
374 __error:
375 module_put(entry->module);
376 __error1:
377 up(&info_mutex);
378 return err;
379 }
380
381 static int snd_info_entry_release(struct inode *inode, struct file *file)
382 {
383 snd_info_entry_t *entry;
384 snd_info_private_data_t *data;
385 int mode;
386
387 mode = file->f_flags & O_ACCMODE;
388 data = file->private_data;
389 entry = data->entry;
390 switch (entry->content) {
391 case SNDRV_INFO_CONTENT_TEXT:
392 if (mode == O_RDONLY || mode == O_RDWR) {
393 vfree(data->rbuffer->buffer);
394 kfree(data->rbuffer);
395 }
396 if (mode == O_WRONLY || mode == O_RDWR) {
397 if (entry->c.text.write) {
398 entry->c.text.write(entry, data->wbuffer);
399 if (data->wbuffer->error) {
400 snd_printk(KERN_WARNING "data write error to %s (%i)\n",
401 entry->name,
402 data->wbuffer->error);
403 }
404 }
405 vfree(data->wbuffer->buffer);
406 kfree(data->wbuffer);
407 }
408 break;
409 case SNDRV_INFO_CONTENT_DATA:
410 if (entry->c.ops->release)
411 entry->c.ops->release(entry, mode,
412 data->file_private_data);
413 break;
414 }
415 module_put(entry->module);
416 kfree(data);
417 return 0;
418 }
419
420 static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait)
421 {
422 snd_info_private_data_t *data;
423 struct snd_info_entry *entry;
424 unsigned int mask;
425
426 data = file->private_data;
427 if (data == NULL)
428 return 0;
429 entry = data->entry;
430 mask = 0;
431 switch (entry->content) {
432 case SNDRV_INFO_CONTENT_DATA:
433 if (entry->c.ops->poll)
434 return entry->c.ops->poll(entry,
435 data->file_private_data,
436 file, wait);
437 if (entry->c.ops->read)
438 mask |= POLLIN | POLLRDNORM;
439 if (entry->c.ops->write)
440 mask |= POLLOUT | POLLWRNORM;
441 break;
442 }
443 return mask;
444 }
445
446 static inline int _snd_info_entry_ioctl(struct inode *inode, struct file *file,
447 unsigned int cmd, unsigned long arg)
448 {
449 snd_info_private_data_t *data;
450 struct snd_info_entry *entry;
451
452 data = file->private_data;
453 if (data == NULL)
454 return 0;
455 entry = data->entry;
456 switch (entry->content) {
457 case SNDRV_INFO_CONTENT_DATA:
458 if (entry->c.ops->ioctl)
459 return entry->c.ops->ioctl(entry,
460 data->file_private_data,
461 file, cmd, arg);
462 break;
463 }
464 return -ENOTTY;
465 }
466
467 /* FIXME: need to unlock BKL to allow preemption */
468 static int snd_info_entry_ioctl(struct inode *inode, struct file *file,
469 unsigned int cmd, unsigned long arg)
470 {
471 int err;
472 unlock_kernel();
473 err = _snd_info_entry_ioctl(inode, file, cmd, arg);
474 lock_kernel();
475 return err;
476 }
477
478 static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma)
479 {
480 struct inode *inode = file->f_dentry->d_inode;
481 snd_info_private_data_t *data;
482 struct snd_info_entry *entry;
483
484 data = file->private_data;
485 if (data == NULL)
486 return 0;
487 entry = data->entry;
488 switch (entry->content) {
489 case SNDRV_INFO_CONTENT_DATA:
490 if (entry->c.ops->mmap)
491 return entry->c.ops->mmap(entry,
492 data->file_private_data,
493 inode, file, vma);
494 break;
495 }
496 return -ENXIO;
497 }
498
499 static struct file_operations snd_info_entry_operations =
500 {
501 .owner = THIS_MODULE,
502 .llseek = snd_info_entry_llseek,
503 .read = snd_info_entry_read,
504 .write = snd_info_entry_write,
505 .poll = snd_info_entry_poll,
506 .ioctl = snd_info_entry_ioctl,
507 .mmap = snd_info_entry_mmap,
508 .open = snd_info_entry_open,
509 .release = snd_info_entry_release,
510 };
511
512 /**
513 * snd_create_proc_entry - create a procfs entry
514 * @name: the name of the proc file
515 * @mode: the file permission bits, S_Ixxx
516 * @parent: the parent proc-directory entry
517 *
518 * Creates a new proc file entry with the given name and permission
519 * on the given directory.
520 *
521 * Returns the pointer of new instance or NULL on failure.
522 */
523 static struct proc_dir_entry *snd_create_proc_entry(const char *name, mode_t mode,
524 struct proc_dir_entry *parent)
525 {
526 struct proc_dir_entry *p;
527 p = create_proc_entry(name, mode, parent);
528 if (p)
529 snd_info_entry_prepare(p);
530 return p;
531 }
532
533 int __init snd_info_init(void)
534 {
535 struct proc_dir_entry *p;
536
537 p = snd_create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, &proc_root);
538 if (p == NULL)
539 return -ENOMEM;
540 snd_proc_root = p;
541 #ifdef CONFIG_SND_OSSEMUL
542 {
543 snd_info_entry_t *entry;
544 if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", 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_oss_root = entry;
552 }
553 #endif
554 #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
555 {
556 snd_info_entry_t *entry;
557 if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL)
558 return -ENOMEM;
559 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
560 if (snd_info_register(entry) < 0) {
561 snd_info_free_entry(entry);
562 return -ENOMEM;
563 }
564 snd_seq_root = entry;
565 }
566 #endif
567 snd_info_version_init();
568 snd_memory_info_init();
569 snd_minor_info_init();
570 snd_minor_info_oss_init();
571 snd_card_info_init();
572 return 0;
573 }
574
575 int __exit snd_info_done(void)
576 {
577 snd_card_info_done();
578 snd_minor_info_oss_done();
579 snd_minor_info_done();
580 snd_memory_info_done();
581 snd_info_version_done();
582 if (snd_proc_root) {
583 #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
584 if (snd_seq_root)
585 snd_info_unregister(snd_seq_root);
586 #endif
587 #ifdef CONFIG_SND_OSSEMUL
588 if (snd_oss_root)
589 snd_info_unregister(snd_oss_root);
590 #endif
591 snd_remove_proc_entry(&proc_root, snd_proc_root);
592 }
593 return 0;
594 }
595
596 /*
597
598 */
599
600
601 /*
602 * create a card proc file
603 * called from init.c
604 */
605 int snd_info_card_create(snd_card_t * card)
606 {
607 char str[8];
608 snd_info_entry_t *entry;
609
610 snd_assert(card != NULL, return -ENXIO);
611
612 sprintf(str, "card%i", card->number);
613 if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL)
614 return -ENOMEM;
615 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
616 if (snd_info_register(entry) < 0) {
617 snd_info_free_entry(entry);
618 return -ENOMEM;
619 }
620 card->proc_root = entry;
621 return 0;
622 }
623
624 /*
625 * register the card proc file
626 * called from init.c
627 */
628 int snd_info_card_register(snd_card_t * card)
629 {
630 struct proc_dir_entry *p;
631
632 snd_assert(card != NULL, return -ENXIO);
633
634 if (!strcmp(card->id, card->proc_root->name))
635 return 0;
636
637 p = proc_symlink(card->id, snd_proc_root, card->proc_root->name);
638 if (p == NULL)
639 return -ENOMEM;
640 card->proc_root_link = p;
641 return 0;
642 }
643
644 /*
645 * de-register the card proc file
646 * called from init.c
647 */
648 int snd_info_card_free(snd_card_t * card)
649 {
650 snd_assert(card != NULL, return -ENXIO);
651 if (card->proc_root_link) {
652 snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
653 card->proc_root_link = NULL;
654 }
655 if (card->proc_root) {
656 snd_info_unregister(card->proc_root);
657 card->proc_root = NULL;
658 }
659 return 0;
660 }
661
662
663 /**
664 * snd_info_get_line - read one line from the procfs buffer
665 * @buffer: the procfs buffer
666 * @line: the buffer to store
667 * @len: the max. buffer size - 1
668 *
669 * Reads one line from the buffer and stores the string.
670 *
671 * Returns zero if successful, or 1 if error or EOF.
672 */
673 int snd_info_get_line(snd_info_buffer_t * buffer, char *line, int len)
674 {
675 int c = -1;
676
677 if (len <= 0 || buffer->stop || buffer->error)
678 return 1;
679 while (--len > 0) {
680 c = *buffer->curr++;
681 if (c == '\n') {
682 if ((buffer->curr - buffer->buffer) >= (long)buffer->size) {
683 buffer->stop = 1;
684 }
685 break;
686 }
687 *line++ = c;
688 if ((buffer->curr - buffer->buffer) >= (long)buffer->size) {
689 buffer->stop = 1;
690 break;
691 }
692 }
693 while (c != '\n' && !buffer->stop) {
694 c = *buffer->curr++;
695 if ((buffer->curr - buffer->buffer) >= (long)buffer->size) {
696 buffer->stop = 1;
697 }
698 }
699 *line = '\0';
700 return 0;
701 }
702
703 /**
704 * snd_info_get_line - parse a string token
705 * @dest: the buffer to store the string token
706 * @src: the original string
707 * @len: the max. length of token - 1
708 *
709 * Parses the original string and copy a token to the given
710 * string buffer.
711 *
712 * Returns the updated pointer of the original string so that
713 * it can be used for the next call.
714 */
715 char *snd_info_get_str(char *dest, char *src, int len)
716 {
717 int c;
718
719 while (*src == ' ' || *src == '\t')
720 src++;
721 if (*src == '"' || *src == '\'') {
722 c = *src++;
723 while (--len > 0 && *src && *src != c) {
724 *dest++ = *src++;
725 }
726 if (*src == c)
727 src++;
728 } else {
729 while (--len > 0 && *src && *src != ' ' && *src != '\t') {
730 *dest++ = *src++;
731 }
732 }
733 *dest = 0;
734 while (*src == ' ' || *src == '\t')
735 src++;
736 return src;
737 }
738
739 /**
740 * snd_info_create_entry - create an info entry
741 * @name: the proc file name
742 *
743 * Creates an info entry with the given file name and initializes as
744 * the default state.
745 *
746 * Usually called from other functions such as
747 * snd_info_create_card_entry().
748 *
749 * Returns the pointer of the new instance, or NULL on failure.
750 */
751 static snd_info_entry_t *snd_info_create_entry(const char *name)
752 {
753 snd_info_entry_t *entry;
754 entry = kcalloc(1, sizeof(*entry), GFP_KERNEL);
755 if (entry == NULL)
756 return NULL;
757 entry->name = snd_kmalloc_strdup(name, GFP_KERNEL);
758 if (entry->name == NULL) {
759 kfree(entry);
760 return NULL;
761 }
762 entry->mode = S_IFREG | S_IRUGO;
763 entry->content = SNDRV_INFO_CONTENT_TEXT;
764 init_MUTEX(&entry->access);
765 return entry;
766 }
767
768 /**
769 * snd_info_create_module_entry - create an info entry for the given module
770 * @module: the module pointer
771 * @name: the file name
772 * @parent: the parent directory
773 *
774 * Creates a new info entry and assigns it to the given module.
775 *
776 * Returns the pointer of the new instance, or NULL on failure.
777 */
778 snd_info_entry_t *snd_info_create_module_entry(struct module * module,
779 const char *name,
780 snd_info_entry_t *parent)
781 {
782 snd_info_entry_t *entry = snd_info_create_entry(name);
783 if (entry) {
784 entry->module = module;
785 entry->parent = parent;
786 }
787 return entry;
788 }
789
790 /**
791 * snd_info_create_card_entry - create an info entry for the given card
792 * @card: the card instance
793 * @name: the file name
794 * @parent: the parent directory
795 *
796 * Creates a new info entry and assigns it to the given card.
797 *
798 * Returns the pointer of the new instance, or NULL on failure.
799 */
800 snd_info_entry_t *snd_info_create_card_entry(snd_card_t * card,
801 const char *name,
802 snd_info_entry_t * parent)
803 {
804 snd_info_entry_t *entry = snd_info_create_entry(name);
805 if (entry) {
806 entry->module = card->module;
807 entry->card = card;
808 entry->parent = parent;
809 }
810 return entry;
811 }
812
813 static int snd_info_dev_free_entry(snd_device_t *device)
814 {
815 snd_info_entry_t *entry = device->device_data;
816 snd_info_free_entry(entry);
817 return 0;
818 }
819
820 static int snd_info_dev_register_entry(snd_device_t *device)
821 {
822 snd_info_entry_t *entry = device->device_data;
823 return snd_info_register(entry);
824 }
825
826 static int snd_info_dev_disconnect_entry(snd_device_t *device)
827 {
828 snd_info_entry_t *entry = device->device_data;
829 entry->disconnected = 1;
830 return 0;
831 }
832
833 static int snd_info_dev_unregister_entry(snd_device_t *device)
834 {
835 snd_info_entry_t *entry = device->device_data;
836 return snd_info_unregister(entry);
837 }
838
839 /**
840 * snd_card_proc_new - create an info entry for the given card
841 * @card: the card instance
842 * @name: the file name
843 * @entryp: the pointer to store the new info entry
844 *
845 * Creates a new info entry and assigns it to the given card.
846 * Unlike snd_info_create_card_entry(), this function registers the
847 * info entry as an ALSA device component, so that it can be
848 * unregistered/released without explicit call.
849 * Also, you don't have to register this entry via snd_info_register(),
850 * since this will be registered by snd_card_register() automatically.
851 *
852 * The parent is assumed as card->proc_root.
853 *
854 * For releasing this entry, use snd_device_free() instead of
855 * snd_info_free_entry().
856 *
857 * Returns zero if successful, or a negative error code on failure.
858 */
859 int snd_card_proc_new(snd_card_t *card, const char *name,
860 snd_info_entry_t **entryp)
861 {
862 static snd_device_ops_t ops = {
863 .dev_free = snd_info_dev_free_entry,
864 .dev_register = snd_info_dev_register_entry,
865 .dev_disconnect = snd_info_dev_disconnect_entry,
866 .dev_unregister = snd_info_dev_unregister_entry
867 };
868 snd_info_entry_t *entry;
869 int err;
870
871 entry = snd_info_create_card_entry(card, name, card->proc_root);
872 if (! entry)
873 return -ENOMEM;
874 if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) {
875 snd_info_free_entry(entry);
876 return err;
877 }
878 if (entryp)
879 *entryp = entry;
880 return 0;
881 }
882
883 /**
884 * snd_info_free_entry - release the info entry
885 * @entry: the info entry
886 *
887 * Releases the info entry. Don't call this after registered.
888 */
889 void snd_info_free_entry(snd_info_entry_t * entry)
890 {
891 if (entry == NULL)
892 return;
893 kfree(entry->name);
894 if (entry->private_free)
895 entry->private_free(entry);
896 kfree(entry);
897 }
898
899 /**
900 * snd_info_register - register the info entry
901 * @entry: the info entry
902 *
903 * Registers the proc info entry.
904 *
905 * Returns zero if successful, or a negative error code on failure.
906 */
907 int snd_info_register(snd_info_entry_t * entry)
908 {
909 struct proc_dir_entry *root, *p = NULL;
910
911 snd_assert(entry != NULL, return -ENXIO);
912 root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
913 down(&info_mutex);
914 p = snd_create_proc_entry(entry->name, entry->mode, root);
915 if (!p) {
916 up(&info_mutex);
917 return -ENOMEM;
918 }
919 p->owner = entry->module;
920 if (!S_ISDIR(entry->mode))
921 p->proc_fops = &snd_info_entry_operations;
922 p->size = entry->size;
923 p->data = entry;
924 entry->p = p;
925 up(&info_mutex);
926 return 0;
927 }
928
929 /**
930 * snd_info_unregister - de-register the info entry
931 * @entry: the info entry
932 *
933 * De-registers the info entry and releases the instance.
934 *
935 * Returns zero if successful, or a negative error code on failure.
936 */
937 int snd_info_unregister(snd_info_entry_t * entry)
938 {
939 struct proc_dir_entry *root;
940
941 snd_assert(entry != NULL && entry->p != NULL, return -ENXIO);
942 root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
943 snd_assert(root, return -ENXIO);
944 down(&info_mutex);
945 snd_remove_proc_entry(root, entry->p);
946 up(&info_mutex);
947 snd_info_free_entry(entry);
948 return 0;
949 }
950
951 /*
952
953 */
954
955 static snd_info_entry_t *snd_info_version_entry = NULL;
956
957 static void snd_info_version_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
958 {
959 snd_iprintf(buffer,
960 "Advanced Linux Sound Architecture Driver Version "
961 CONFIG_SND_VERSION CONFIG_SND_DATE ".\n"
962 );
963 }
964
965 static int __init snd_info_version_init(void)
966 {
967 snd_info_entry_t *entry;
968
969 entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL);
970 if (entry == NULL)
971 return -ENOMEM;
972 entry->c.text.read_size = 256;
973 entry->c.text.read = snd_info_version_read;
974 if (snd_info_register(entry) < 0) {
975 snd_info_free_entry(entry);
976 return -ENOMEM;
977 }
978 snd_info_version_entry = entry;
979 return 0;
980 }
981
982 static int __exit snd_info_version_done(void)
983 {
984 if (snd_info_version_entry)
985 snd_info_unregister(snd_info_version_entry);
986 return 0;
987 }
988
989 #endif /* CONFIG_PROC_FS */
x86 "subsystem" repository