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TOMOYO Linux Cross Reference
Linux/sound/core/info.c

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  1 /*
  2  *  Information interface for ALSA driver
  3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
  4  *
  5  *
  6  *   This program is free software; you can redistribute it and/or modify
  7  *   it under the terms of the GNU General Public License as published by
  8  *   the Free Software Foundation; either version 2 of the License, or
  9  *   (at your option) any later version.
 10  *
 11  *   This program is distributed in the hope that it will be useful,
 12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  *   GNU General Public License for more details.
 15  *
 16  *   You should have received a copy of the GNU General Public License
 17  *   along with this program; if not, write to the Free Software
 18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 19  *
 20  */
 21 
 22 #include <linux/init.h>
 23 #include <linux/time.h>
 24 #include <linux/mm.h>
 25 #include <linux/slab.h>
 26 #include <linux/string.h>
 27 #include <linux/module.h>
 28 #include <sound/core.h>
 29 #include <sound/minors.h>
 30 #include <sound/info.h>
 31 #include <linux/utsname.h>
 32 #include <linux/proc_fs.h>
 33 #include <linux/mutex.h>
 34 #include <stdarg.h>
 35 
 36 /*
 37  *
 38  */
 39 
 40 #ifdef CONFIG_PROC_FS
 41 
 42 int snd_info_check_reserved_words(const char *str)
 43 {
 44         static char *reserved[] =
 45         {
 46                 "version",
 47                 "meminfo",
 48                 "memdebug",
 49                 "detect",
 50                 "devices",
 51                 "oss",
 52                 "cards",
 53                 "timers",
 54                 "synth",
 55                 "pcm",
 56                 "seq",
 57                 NULL
 58         };
 59         char **xstr = reserved;
 60 
 61         while (*xstr) {
 62                 if (!strcmp(*xstr, str))
 63                         return 0;
 64                 xstr++;
 65         }
 66         if (!strncmp(str, "card", 4))
 67                 return 0;
 68         return 1;
 69 }
 70 
 71 static DEFINE_MUTEX(info_mutex);
 72 
 73 struct snd_info_private_data {
 74         struct snd_info_buffer *rbuffer;
 75         struct snd_info_buffer *wbuffer;
 76         struct snd_info_entry *entry;
 77         void *file_private_data;
 78 };
 79 
 80 static int snd_info_version_init(void);
 81 static int snd_info_version_done(void);
 82 static void snd_info_disconnect(struct snd_info_entry *entry);
 83 
 84 
 85 /* resize the proc r/w buffer */
 86 static int resize_info_buffer(struct snd_info_buffer *buffer,
 87                               unsigned int nsize)
 88 {
 89         char *nbuf;
 90 
 91         nsize = PAGE_ALIGN(nsize);
 92         nbuf = krealloc(buffer->buffer, nsize, GFP_KERNEL | __GFP_ZERO);
 93         if (! nbuf)
 94                 return -ENOMEM;
 95 
 96         buffer->buffer = nbuf;
 97         buffer->len = nsize;
 98         return 0;
 99 }
100 
101 /**
102  * snd_iprintf - printf on the procfs buffer
103  * @buffer: the procfs buffer
104  * @fmt: the printf format
105  *
106  * Outputs the string on the procfs buffer just like printf().
107  *
108  * Return: The size of output string, or a negative error code.
109  */
110 int snd_iprintf(struct snd_info_buffer *buffer, const char *fmt, ...)
111 {
112         va_list args;
113         int len, res;
114         int err = 0;
115 
116         might_sleep();
117         if (buffer->stop || buffer->error)
118                 return 0;
119         len = buffer->len - buffer->size;
120         va_start(args, fmt);
121         for (;;) {
122                 va_list ap;
123                 va_copy(ap, args);
124                 res = vsnprintf(buffer->buffer + buffer->curr, len, fmt, ap);
125                 va_end(ap);
126                 if (res < len)
127                         break;
128                 err = resize_info_buffer(buffer, buffer->len + PAGE_SIZE);
129                 if (err < 0)
130                         break;
131                 len = buffer->len - buffer->size;
132         }
133         va_end(args);
134 
135         if (err < 0)
136                 return err;
137         buffer->curr += res;
138         buffer->size += res;
139         return res;
140 }
141 
142 EXPORT_SYMBOL(snd_iprintf);
143 
144 /*
145 
146  */
147 
148 static struct proc_dir_entry *snd_proc_root;
149 struct snd_info_entry *snd_seq_root;
150 EXPORT_SYMBOL(snd_seq_root);
151 
152 #ifdef CONFIG_SND_OSSEMUL
153 struct snd_info_entry *snd_oss_root;
154 #endif
155 
156 static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
157 {
158         struct snd_info_private_data *data;
159         struct snd_info_entry *entry;
160         loff_t ret = -EINVAL, size;
161 
162         data = file->private_data;
163         entry = data->entry;
164         mutex_lock(&entry->access);
165         if (entry->content == SNDRV_INFO_CONTENT_DATA &&
166             entry->c.ops->llseek) {
167                 offset = entry->c.ops->llseek(entry,
168                                               data->file_private_data,
169                                               file, offset, orig);
170                 goto out;
171         }
172         if (entry->content == SNDRV_INFO_CONTENT_DATA)
173                 size = entry->size;
174         else
175                 size = 0;
176         switch (orig) {
177         case SEEK_SET:
178                 break;
179         case SEEK_CUR:
180                 offset += file->f_pos;
181                 break;
182         case SEEK_END:
183                 if (!size)
184                         goto out;
185                 offset += size;
186                 break;
187         default:
188                 goto out;
189         }
190         if (offset < 0)
191                 goto out;
192         if (size && offset > size)
193                 offset = size;
194         file->f_pos = offset;
195         ret = offset;
196  out:
197         mutex_unlock(&entry->access);
198         return ret;
199 }
200 
201 static ssize_t snd_info_entry_read(struct file *file, char __user *buffer,
202                                    size_t count, loff_t * offset)
203 {
204         struct snd_info_private_data *data;
205         struct snd_info_entry *entry;
206         struct snd_info_buffer *buf;
207         size_t size = 0;
208         loff_t pos;
209 
210         data = file->private_data;
211         if (snd_BUG_ON(!data))
212                 return -ENXIO;
213         pos = *offset;
214         if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
215                 return -EIO;
216         if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
217                 return -EIO;
218         entry = data->entry;
219         switch (entry->content) {
220         case SNDRV_INFO_CONTENT_TEXT:
221                 buf = data->rbuffer;
222                 if (buf == NULL)
223                         return -EIO;
224                 if (pos >= buf->size)
225                         return 0;
226                 size = buf->size - pos;
227                 size = min(count, size);
228                 if (copy_to_user(buffer, buf->buffer + pos, size))
229                         return -EFAULT;
230                 break;
231         case SNDRV_INFO_CONTENT_DATA:
232                 if (pos >= entry->size)
233                         return 0;
234                 if (entry->c.ops->read) {
235                         size = entry->size - pos;
236                         size = min(count, size);
237                         size = entry->c.ops->read(entry,
238                                                   data->file_private_data,
239                                                   file, buffer, size, pos);
240                 }
241                 break;
242         }
243         if ((ssize_t) size > 0)
244                 *offset = pos + size;
245         return size;
246 }
247 
248 static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer,
249                                     size_t count, loff_t * offset)
250 {
251         struct snd_info_private_data *data;
252         struct snd_info_entry *entry;
253         struct snd_info_buffer *buf;
254         ssize_t size = 0;
255         loff_t pos;
256 
257         data = file->private_data;
258         if (snd_BUG_ON(!data))
259                 return -ENXIO;
260         entry = data->entry;
261         pos = *offset;
262         if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
263                 return -EIO;
264         if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
265                 return -EIO;
266         switch (entry->content) {
267         case SNDRV_INFO_CONTENT_TEXT:
268                 buf = data->wbuffer;
269                 if (buf == NULL)
270                         return -EIO;
271                 mutex_lock(&entry->access);
272                 if (pos + count >= buf->len) {
273                         if (resize_info_buffer(buf, pos + count)) {
274                                 mutex_unlock(&entry->access);
275                                 return -ENOMEM;
276                         }
277                 }
278                 if (copy_from_user(buf->buffer + pos, buffer, count)) {
279                         mutex_unlock(&entry->access);
280                         return -EFAULT;
281                 }
282                 buf->size = pos + count;
283                 mutex_unlock(&entry->access);
284                 size = count;
285                 break;
286         case SNDRV_INFO_CONTENT_DATA:
287                 if (entry->c.ops->write && count > 0) {
288                         size_t maxsize = entry->size - pos;
289                         count = min(count, maxsize);
290                         size = entry->c.ops->write(entry,
291                                                    data->file_private_data,
292                                                    file, buffer, count, pos);
293                 }
294                 break;
295         }
296         if ((ssize_t) size > 0)
297                 *offset = pos + size;
298         return size;
299 }
300 
301 static int snd_info_entry_open(struct inode *inode, struct file *file)
302 {
303         struct snd_info_entry *entry;
304         struct snd_info_private_data *data;
305         struct snd_info_buffer *buffer;
306         int mode, err;
307 
308         mutex_lock(&info_mutex);
309         entry = PDE_DATA(inode);
310         if (entry == NULL || ! entry->p) {
311                 mutex_unlock(&info_mutex);
312                 return -ENODEV;
313         }
314         if (!try_module_get(entry->module)) {
315                 err = -EFAULT;
316                 goto __error1;
317         }
318         mode = file->f_flags & O_ACCMODE;
319         if (mode == O_RDONLY || mode == O_RDWR) {
320                 if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
321                      entry->c.ops->read == NULL)) {
322                         err = -ENODEV;
323                         goto __error;
324                 }
325         }
326         if (mode == O_WRONLY || mode == O_RDWR) {
327                 if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
328                      entry->c.ops->write == NULL)) {
329                         err = -ENODEV;
330                         goto __error;
331                 }
332         }
333         data = kzalloc(sizeof(*data), GFP_KERNEL);
334         if (data == NULL) {
335                 err = -ENOMEM;
336                 goto __error;
337         }
338         data->entry = entry;
339         switch (entry->content) {
340         case SNDRV_INFO_CONTENT_TEXT:
341                 if (mode == O_RDONLY || mode == O_RDWR) {
342                         buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
343                         if (buffer == NULL)
344                                 goto __nomem;
345                         data->rbuffer = buffer;
346                         buffer->len = PAGE_SIZE;
347                         buffer->buffer = kzalloc(buffer->len, GFP_KERNEL);
348                         if (buffer->buffer == NULL)
349                                 goto __nomem;
350                 }
351                 if (mode == O_WRONLY || mode == O_RDWR) {
352                         buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
353                         if (buffer == NULL)
354                                 goto __nomem;
355                         data->wbuffer = buffer;
356                         buffer->len = PAGE_SIZE;
357                         buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
358                         if (buffer->buffer == NULL)
359                                 goto __nomem;
360                 }
361                 break;
362         case SNDRV_INFO_CONTENT_DATA:   /* data */
363                 if (entry->c.ops->open) {
364                         if ((err = entry->c.ops->open(entry, mode,
365                                                       &data->file_private_data)) < 0) {
366                                 kfree(data);
367                                 goto __error;
368                         }
369                 }
370                 break;
371         }
372         file->private_data = data;
373         mutex_unlock(&info_mutex);
374         if (entry->content == SNDRV_INFO_CONTENT_TEXT &&
375             (mode == O_RDONLY || mode == O_RDWR)) {
376                 if (entry->c.text.read) {
377                         mutex_lock(&entry->access);
378                         entry->c.text.read(entry, data->rbuffer);
379                         mutex_unlock(&entry->access);
380                 }
381         }
382         return 0;
383 
384  __nomem:
385         if (data->rbuffer) {
386                 kfree(data->rbuffer->buffer);
387                 kfree(data->rbuffer);
388         }
389         if (data->wbuffer) {
390                 kfree(data->wbuffer->buffer);
391                 kfree(data->wbuffer);
392         }
393         kfree(data);
394         err = -ENOMEM;
395       __error:
396         module_put(entry->module);
397       __error1:
398         mutex_unlock(&info_mutex);
399         return err;
400 }
401 
402 static int snd_info_entry_release(struct inode *inode, struct file *file)
403 {
404         struct snd_info_entry *entry;
405         struct snd_info_private_data *data;
406         int mode;
407 
408         mode = file->f_flags & O_ACCMODE;
409         data = file->private_data;
410         entry = data->entry;
411         switch (entry->content) {
412         case SNDRV_INFO_CONTENT_TEXT:
413                 if (data->rbuffer) {
414                         kfree(data->rbuffer->buffer);
415                         kfree(data->rbuffer);
416                 }
417                 if (data->wbuffer) {
418                         if (entry->c.text.write) {
419                                 entry->c.text.write(entry, data->wbuffer);
420                                 if (data->wbuffer->error) {
421                                         snd_printk(KERN_WARNING "data write error to %s (%i)\n",
422                                                 entry->name,
423                                                 data->wbuffer->error);
424                                 }
425                         }
426                         kfree(data->wbuffer->buffer);
427                         kfree(data->wbuffer);
428                 }
429                 break;
430         case SNDRV_INFO_CONTENT_DATA:
431                 if (entry->c.ops->release)
432                         entry->c.ops->release(entry, mode,
433                                               data->file_private_data);
434                 break;
435         }
436         module_put(entry->module);
437         kfree(data);
438         return 0;
439 }
440 
441 static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait)
442 {
443         struct snd_info_private_data *data;
444         struct snd_info_entry *entry;
445         unsigned int mask;
446 
447         data = file->private_data;
448         if (data == NULL)
449                 return 0;
450         entry = data->entry;
451         mask = 0;
452         switch (entry->content) {
453         case SNDRV_INFO_CONTENT_DATA:
454                 if (entry->c.ops->poll)
455                         return entry->c.ops->poll(entry,
456                                                   data->file_private_data,
457                                                   file, wait);
458                 if (entry->c.ops->read)
459                         mask |= POLLIN | POLLRDNORM;
460                 if (entry->c.ops->write)
461                         mask |= POLLOUT | POLLWRNORM;
462                 break;
463         }
464         return mask;
465 }
466 
467 static long snd_info_entry_ioctl(struct file *file, unsigned int cmd,
468                                 unsigned long arg)
469 {
470         struct snd_info_private_data *data;
471         struct snd_info_entry *entry;
472 
473         data = file->private_data;
474         if (data == NULL)
475                 return 0;
476         entry = data->entry;
477         switch (entry->content) {
478         case SNDRV_INFO_CONTENT_DATA:
479                 if (entry->c.ops->ioctl)
480                         return entry->c.ops->ioctl(entry,
481                                                    data->file_private_data,
482                                                    file, cmd, arg);
483                 break;
484         }
485         return -ENOTTY;
486 }
487 
488 static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma)
489 {
490         struct inode *inode = file_inode(file);
491         struct snd_info_private_data *data;
492         struct snd_info_entry *entry;
493 
494         data = file->private_data;
495         if (data == NULL)
496                 return 0;
497         entry = data->entry;
498         switch (entry->content) {
499         case SNDRV_INFO_CONTENT_DATA:
500                 if (entry->c.ops->mmap)
501                         return entry->c.ops->mmap(entry,
502                                                   data->file_private_data,
503                                                   inode, file, vma);
504                 break;
505         }
506         return -ENXIO;
507 }
508 
509 static const struct file_operations snd_info_entry_operations =
510 {
511         .owner =                THIS_MODULE,
512         .llseek =               snd_info_entry_llseek,
513         .read =                 snd_info_entry_read,
514         .write =                snd_info_entry_write,
515         .poll =                 snd_info_entry_poll,
516         .unlocked_ioctl =       snd_info_entry_ioctl,
517         .mmap =                 snd_info_entry_mmap,
518         .open =                 snd_info_entry_open,
519         .release =              snd_info_entry_release,
520 };
521 
522 int __init snd_info_init(void)
523 {
524         struct proc_dir_entry *p;
525 
526         p = proc_mkdir("asound", NULL);
527         if (p == NULL)
528                 return -ENOMEM;
529         snd_proc_root = p;
530 #ifdef CONFIG_SND_OSSEMUL
531         {
532                 struct snd_info_entry *entry;
533                 if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL)
534                         return -ENOMEM;
535                 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
536                 if (snd_info_register(entry) < 0) {
537                         snd_info_free_entry(entry);
538                         return -ENOMEM;
539                 }
540                 snd_oss_root = entry;
541         }
542 #endif
543 #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
544         {
545                 struct snd_info_entry *entry;
546                 if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL)
547                         return -ENOMEM;
548                 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
549                 if (snd_info_register(entry) < 0) {
550                         snd_info_free_entry(entry);
551                         return -ENOMEM;
552                 }
553                 snd_seq_root = entry;
554         }
555 #endif
556         snd_info_version_init();
557         snd_minor_info_init();
558         snd_minor_info_oss_init();
559         snd_card_info_init();
560         return 0;
561 }
562 
563 int __exit snd_info_done(void)
564 {
565         snd_card_info_done();
566         snd_minor_info_oss_done();
567         snd_minor_info_done();
568         snd_info_version_done();
569         if (snd_proc_root) {
570 #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
571                 snd_info_free_entry(snd_seq_root);
572 #endif
573 #ifdef CONFIG_SND_OSSEMUL
574                 snd_info_free_entry(snd_oss_root);
575 #endif
576                 proc_remove(snd_proc_root);
577         }
578         return 0;
579 }
580 
581 /*
582 
583  */
584 
585 
586 /*
587  * create a card proc file
588  * called from init.c
589  */
590 int snd_info_card_create(struct snd_card *card)
591 {
592         char str[8];
593         struct snd_info_entry *entry;
594 
595         if (snd_BUG_ON(!card))
596                 return -ENXIO;
597 
598         sprintf(str, "card%i", card->number);
599         if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL)
600                 return -ENOMEM;
601         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
602         if (snd_info_register(entry) < 0) {
603                 snd_info_free_entry(entry);
604                 return -ENOMEM;
605         }
606         card->proc_root = entry;
607         return 0;
608 }
609 
610 /*
611  * register the card proc file
612  * called from init.c
613  */
614 int snd_info_card_register(struct snd_card *card)
615 {
616         struct proc_dir_entry *p;
617 
618         if (snd_BUG_ON(!card))
619                 return -ENXIO;
620 
621         if (!strcmp(card->id, card->proc_root->name))
622                 return 0;
623 
624         p = proc_symlink(card->id, snd_proc_root, card->proc_root->name);
625         if (p == NULL)
626                 return -ENOMEM;
627         card->proc_root_link = p;
628         return 0;
629 }
630 
631 /*
632  * called on card->id change
633  */
634 void snd_info_card_id_change(struct snd_card *card)
635 {
636         mutex_lock(&info_mutex);
637         if (card->proc_root_link) {
638                 proc_remove(card->proc_root_link);
639                 card->proc_root_link = NULL;
640         }
641         if (strcmp(card->id, card->proc_root->name))
642                 card->proc_root_link = proc_symlink(card->id,
643                                                     snd_proc_root,
644                                                     card->proc_root->name);
645         mutex_unlock(&info_mutex);
646 }
647 
648 /*
649  * de-register the card proc file
650  * called from init.c
651  */
652 void snd_info_card_disconnect(struct snd_card *card)
653 {
654         if (!card)
655                 return;
656         mutex_lock(&info_mutex);
657         proc_remove(card->proc_root_link);
658         card->proc_root_link = NULL;
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  * Return: 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 (snd_BUG_ON(!buffer || !buffer->buffer))
693                 return 1;
694         if (len <= 0 || buffer->stop || buffer->error)
695                 return 1;
696         while (!buffer->stop) {
697                 c = buffer->buffer[buffer->curr++];
698                 if (buffer->curr >= buffer->size)
699                         buffer->stop = 1;
700                 if (c == '\n')
701                         break;
702                 if (len) {
703                         len--;
704                         *line++ = c;
705                 }
706         }
707         *line = '\0';
708         return 0;
709 }
710 
711 EXPORT_SYMBOL(snd_info_get_line);
712 
713 /**
714  * snd_info_get_str - parse a string token
715  * @dest: the buffer to store the string token
716  * @src: the original string
717  * @len: the max. length of token - 1
718  *
719  * Parses the original string and copy a token to the given
720  * string buffer.
721  *
722  * Return: The updated pointer of the original string so that
723  * it can be used for the next call.
724  */
725 const char *snd_info_get_str(char *dest, const char *src, int len)
726 {
727         int c;
728 
729         while (*src == ' ' || *src == '\t')
730                 src++;
731         if (*src == '"' || *src == '\'') {
732                 c = *src++;
733                 while (--len > 0 && *src && *src != c) {
734                         *dest++ = *src++;
735                 }
736                 if (*src == c)
737                         src++;
738         } else {
739                 while (--len > 0 && *src && *src != ' ' && *src != '\t') {
740                         *dest++ = *src++;
741                 }
742         }
743         *dest = 0;
744         while (*src == ' ' || *src == '\t')
745                 src++;
746         return src;
747 }
748 
749 EXPORT_SYMBOL(snd_info_get_str);
750 
751 /**
752  * snd_info_create_entry - create an info entry
753  * @name: the proc file name
754  *
755  * Creates an info entry with the given file name and initializes as
756  * the default state.
757  *
758  * Usually called from other functions such as
759  * snd_info_create_card_entry().
760  *
761  * Return: The pointer of the new instance, or %NULL on failure.
762  */
763 static struct snd_info_entry *snd_info_create_entry(const char *name)
764 {
765         struct snd_info_entry *entry;
766         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
767         if (entry == NULL)
768                 return NULL;
769         entry->name = kstrdup(name, GFP_KERNEL);
770         if (entry->name == NULL) {
771                 kfree(entry);
772                 return NULL;
773         }
774         entry->mode = S_IFREG | S_IRUGO;
775         entry->content = SNDRV_INFO_CONTENT_TEXT;
776         mutex_init(&entry->access);
777         INIT_LIST_HEAD(&entry->children);
778         INIT_LIST_HEAD(&entry->list);
779         return entry;
780 }
781 
782 /**
783  * snd_info_create_module_entry - create an info entry for the given module
784  * @module: the module pointer
785  * @name: the file name
786  * @parent: the parent directory
787  *
788  * Creates a new info entry and assigns it to the given module.
789  *
790  * Return: The pointer of the new instance, or %NULL on failure.
791  */
792 struct snd_info_entry *snd_info_create_module_entry(struct module * module,
793                                                const char *name,
794                                                struct snd_info_entry *parent)
795 {
796         struct snd_info_entry *entry = snd_info_create_entry(name);
797         if (entry) {
798                 entry->module = module;
799                 entry->parent = parent;
800         }
801         return entry;
802 }
803 
804 EXPORT_SYMBOL(snd_info_create_module_entry);
805 
806 /**
807  * snd_info_create_card_entry - create an info entry for the given card
808  * @card: the card instance
809  * @name: the file name
810  * @parent: the parent directory
811  *
812  * Creates a new info entry and assigns it to the given card.
813  *
814  * Return: The pointer of the new instance, or %NULL on failure.
815  */
816 struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
817                                              const char *name,
818                                              struct snd_info_entry * parent)
819 {
820         struct snd_info_entry *entry = snd_info_create_entry(name);
821         if (entry) {
822                 entry->module = card->module;
823                 entry->card = card;
824                 entry->parent = parent;
825         }
826         return entry;
827 }
828 
829 EXPORT_SYMBOL(snd_info_create_card_entry);
830 
831 static void snd_info_disconnect(struct snd_info_entry *entry)
832 {
833         struct list_head *p, *n;
834         struct proc_dir_entry *root;
835 
836         list_for_each_safe(p, n, &entry->children) {
837                 snd_info_disconnect(list_entry(p, struct snd_info_entry, list));
838         }
839 
840         if (! entry->p)
841                 return;
842         list_del_init(&entry->list);
843         root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
844         snd_BUG_ON(!root);
845         proc_remove(entry->p);
846         entry->p = NULL;
847 }
848 
849 static int snd_info_dev_free_entry(struct snd_device *device)
850 {
851         struct snd_info_entry *entry = device->device_data;
852         snd_info_free_entry(entry);
853         return 0;
854 }
855 
856 static int snd_info_dev_register_entry(struct snd_device *device)
857 {
858         struct snd_info_entry *entry = device->device_data;
859         return snd_info_register(entry);
860 }
861 
862 /**
863  * snd_card_proc_new - create an info entry for the given card
864  * @card: the card instance
865  * @name: the file name
866  * @entryp: the pointer to store the new info entry
867  *
868  * Creates a new info entry and assigns it to the given card.
869  * Unlike snd_info_create_card_entry(), this function registers the
870  * info entry as an ALSA device component, so that it can be
871  * unregistered/released without explicit call.
872  * Also, you don't have to register this entry via snd_info_register(),
873  * since this will be registered by snd_card_register() automatically.
874  *
875  * The parent is assumed as card->proc_root.
876  *
877  * For releasing this entry, use snd_device_free() instead of
878  * snd_info_free_entry(). 
879  *
880  * Return: Zero if successful, or a negative error code on failure.
881  */
882 int snd_card_proc_new(struct snd_card *card, const char *name,
883                       struct snd_info_entry **entryp)
884 {
885         static struct snd_device_ops ops = {
886                 .dev_free = snd_info_dev_free_entry,
887                 .dev_register = snd_info_dev_register_entry,
888                 /* disconnect is done via snd_info_card_disconnect() */
889         };
890         struct snd_info_entry *entry;
891         int err;
892 
893         entry = snd_info_create_card_entry(card, name, card->proc_root);
894         if (! entry)
895                 return -ENOMEM;
896         if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) {
897                 snd_info_free_entry(entry);
898                 return err;
899         }
900         if (entryp)
901                 *entryp = entry;
902         return 0;
903 }
904 
905 EXPORT_SYMBOL(snd_card_proc_new);
906 
907 /**
908  * snd_info_free_entry - release the info entry
909  * @entry: the info entry
910  *
911  * Releases the info entry.  Don't call this after registered.
912  */
913 void snd_info_free_entry(struct snd_info_entry * entry)
914 {
915         if (entry == NULL)
916                 return;
917         if (entry->p) {
918                 mutex_lock(&info_mutex);
919                 snd_info_disconnect(entry);
920                 mutex_unlock(&info_mutex);
921         }
922         kfree(entry->name);
923         if (entry->private_free)
924                 entry->private_free(entry);
925         kfree(entry);
926 }
927 
928 EXPORT_SYMBOL(snd_info_free_entry);
929 
930 /**
931  * snd_info_register - register the info entry
932  * @entry: the info entry
933  *
934  * Registers the proc info entry.
935  *
936  * Return: Zero if successful, or a negative error code on failure.
937  */
938 int snd_info_register(struct snd_info_entry * entry)
939 {
940         struct proc_dir_entry *root, *p = NULL;
941 
942         if (snd_BUG_ON(!entry))
943                 return -ENXIO;
944         root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
945         mutex_lock(&info_mutex);
946         if (S_ISDIR(entry->mode)) {
947                 p = proc_mkdir_mode(entry->name, entry->mode, root);
948                 if (!p) {
949                         mutex_unlock(&info_mutex);
950                         return -ENOMEM;
951                 }
952         } else {
953                 p = proc_create_data(entry->name, entry->mode, root,
954                                         &snd_info_entry_operations, entry);
955                 if (!p) {
956                         mutex_unlock(&info_mutex);
957                         return -ENOMEM;
958                 }
959                 proc_set_size(p, entry->size);
960         }
961         entry->p = p;
962         if (entry->parent)
963                 list_add_tail(&entry->list, &entry->parent->children);
964         mutex_unlock(&info_mutex);
965         return 0;
966 }
967 
968 EXPORT_SYMBOL(snd_info_register);
969 
970 /*
971 
972  */
973 
974 static struct snd_info_entry *snd_info_version_entry;
975 
976 static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
977 {
978         snd_iprintf(buffer,
979                     "Advanced Linux Sound Architecture Driver Version k%s.\n",
980                     init_utsname()->release);
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 */
1006 

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