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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 <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 = krealloc(buffer->buffer, nsize, GFP_KERNEL); |
92 | if (! nbuf) |
93 | return -ENOMEM; |
94 | |
95 | buffer->buffer = nbuf; |
96 | buffer->len = nsize; |
97 | return 0; |
98 | } |
99 | |
100 | /** |
101 | * snd_iprintf - printf on the procfs buffer |
102 | * @buffer: the procfs buffer |
103 | * @fmt: the printf format |
104 | * |
105 | * Outputs the string on the procfs buffer just like printf(). |
106 | * |
107 | * Returns the size of output string. |
108 | */ |
109 | int snd_iprintf(struct snd_info_buffer *buffer, const char *fmt, ...) |
110 | { |
111 | va_list args; |
112 | int len, res; |
113 | int err = 0; |
114 | |
115 | might_sleep(); |
116 | if (buffer->stop || buffer->error) |
117 | return 0; |
118 | len = buffer->len - buffer->size; |
119 | va_start(args, fmt); |
120 | for (;;) { |
121 | va_list ap; |
122 | va_copy(ap, args); |
123 | res = vsnprintf(buffer->buffer + buffer->curr, len, fmt, ap); |
124 | va_end(ap); |
125 | if (res < len) |
126 | break; |
127 | err = resize_info_buffer(buffer, buffer->len + PAGE_SIZE); |
128 | if (err < 0) |
129 | break; |
130 | len = buffer->len - buffer->size; |
131 | } |
132 | va_end(args); |
133 | |
134 | if (err < 0) |
135 | return err; |
136 | buffer->curr += res; |
137 | buffer->size += res; |
138 | return res; |
139 | } |
140 | |
141 | EXPORT_SYMBOL(snd_iprintf); |
142 | |
143 | /* |
144 | |
145 | */ |
146 | |
147 | static struct proc_dir_entry *snd_proc_root; |
148 | struct snd_info_entry *snd_seq_root; |
149 | EXPORT_SYMBOL(snd_seq_root); |
150 | |
151 | #ifdef CONFIG_SND_OSSEMUL |
152 | struct snd_info_entry *snd_oss_root; |
153 | #endif |
154 | |
155 | static void snd_remove_proc_entry(struct proc_dir_entry *parent, |
156 | struct proc_dir_entry *de) |
157 | { |
158 | if (de) |
159 | remove_proc_entry(de->name, parent); |
160 | } |
161 | |
162 | static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig) |
163 | { |
164 | struct snd_info_private_data *data; |
165 | struct snd_info_entry *entry; |
166 | loff_t ret = -EINVAL, size; |
167 | |
168 | data = file->private_data; |
169 | entry = data->entry; |
170 | mutex_lock(&entry->access); |
171 | if (entry->content == SNDRV_INFO_CONTENT_DATA && |
172 | entry->c.ops->llseek) { |
173 | offset = entry->c.ops->llseek(entry, |
174 | data->file_private_data, |
175 | file, offset, orig); |
176 | goto out; |
177 | } |
178 | if (entry->content == SNDRV_INFO_CONTENT_DATA) |
179 | size = entry->size; |
180 | else |
181 | size = 0; |
182 | switch (orig) { |
183 | case SEEK_SET: |
184 | break; |
185 | case SEEK_CUR: |
186 | offset += file->f_pos; |
187 | break; |
188 | case SEEK_END: |
189 | if (!size) |
190 | goto out; |
191 | offset += size; |
192 | break; |
193 | default: |
194 | goto out; |
195 | } |
196 | if (offset < 0) |
197 | goto out; |
198 | if (size && offset > size) |
199 | offset = size; |
200 | file->f_pos = offset; |
201 | ret = offset; |
202 | out: |
203 | mutex_unlock(&entry->access); |
204 | return ret; |
205 | } |
206 | |
207 | static ssize_t snd_info_entry_read(struct file *file, char __user *buffer, |
208 | size_t count, loff_t * offset) |
209 | { |
210 | struct snd_info_private_data *data; |
211 | struct snd_info_entry *entry; |
212 | struct snd_info_buffer *buf; |
213 | size_t size = 0; |
214 | loff_t pos; |
215 | |
216 | data = file->private_data; |
217 | if (snd_BUG_ON(!data)) |
218 | return -ENXIO; |
219 | pos = *offset; |
220 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) |
221 | return -EIO; |
222 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) |
223 | return -EIO; |
224 | entry = data->entry; |
225 | switch (entry->content) { |
226 | case SNDRV_INFO_CONTENT_TEXT: |
227 | buf = data->rbuffer; |
228 | if (buf == NULL) |
229 | return -EIO; |
230 | if (pos >= buf->size) |
231 | return 0; |
232 | size = buf->size - pos; |
233 | size = min(count, size); |
234 | if (copy_to_user(buffer, buf->buffer + pos, size)) |
235 | return -EFAULT; |
236 | break; |
237 | case SNDRV_INFO_CONTENT_DATA: |
238 | if (pos >= entry->size) |
239 | return 0; |
240 | if (entry->c.ops->read) { |
241 | size = entry->size - pos; |
242 | size = min(count, size); |
243 | size = entry->c.ops->read(entry, |
244 | data->file_private_data, |
245 | file, buffer, size, pos); |
246 | } |
247 | break; |
248 | } |
249 | if ((ssize_t) size > 0) |
250 | *offset = pos + size; |
251 | return size; |
252 | } |
253 | |
254 | static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer, |
255 | size_t count, loff_t * offset) |
256 | { |
257 | struct snd_info_private_data *data; |
258 | struct snd_info_entry *entry; |
259 | struct snd_info_buffer *buf; |
260 | ssize_t size = 0; |
261 | loff_t pos; |
262 | |
263 | data = file->private_data; |
264 | if (snd_BUG_ON(!data)) |
265 | return -ENXIO; |
266 | entry = data->entry; |
267 | pos = *offset; |
268 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) |
269 | return -EIO; |
270 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) |
271 | return -EIO; |
272 | switch (entry->content) { |
273 | case SNDRV_INFO_CONTENT_TEXT: |
274 | buf = data->wbuffer; |
275 | if (buf == NULL) |
276 | return -EIO; |
277 | mutex_lock(&entry->access); |
278 | if (pos + count >= buf->len) { |
279 | if (resize_info_buffer(buf, pos + count)) { |
280 | mutex_unlock(&entry->access); |
281 | return -ENOMEM; |
282 | } |
283 | } |
284 | if (copy_from_user(buf->buffer + pos, buffer, count)) { |
285 | mutex_unlock(&entry->access); |
286 | return -EFAULT; |
287 | } |
288 | buf->size = pos + count; |
289 | mutex_unlock(&entry->access); |
290 | size = count; |
291 | break; |
292 | case SNDRV_INFO_CONTENT_DATA: |
293 | if (entry->c.ops->write && count > 0) { |
294 | size_t maxsize = entry->size - pos; |
295 | count = min(count, maxsize); |
296 | size = entry->c.ops->write(entry, |
297 | data->file_private_data, |
298 | file, buffer, count, pos); |
299 | } |
300 | break; |
301 | } |
302 | if ((ssize_t) size > 0) |
303 | *offset = pos + size; |
304 | return size; |
305 | } |
306 | |
307 | static int snd_info_entry_open(struct inode *inode, struct file *file) |
308 | { |
309 | struct snd_info_entry *entry; |
310 | struct snd_info_private_data *data; |
311 | struct snd_info_buffer *buffer; |
312 | struct proc_dir_entry *p; |
313 | int mode, err; |
314 | |
315 | mutex_lock(&info_mutex); |
316 | p = PDE(inode); |
317 | entry = p == NULL ? NULL : (struct snd_info_entry *)p->data; |
318 | if (entry == NULL || ! entry->p) { |
319 | mutex_unlock(&info_mutex); |
320 | return -ENODEV; |
321 | } |
322 | if (!try_module_get(entry->module)) { |
323 | err = -EFAULT; |
324 | goto __error1; |
325 | } |
326 | mode = file->f_flags & O_ACCMODE; |
327 | if (mode == O_RDONLY || mode == O_RDWR) { |
328 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
329 | entry->c.ops->read == NULL)) { |
330 | err = -ENODEV; |
331 | goto __error; |
332 | } |
333 | } |
334 | if (mode == O_WRONLY || mode == O_RDWR) { |
335 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
336 | entry->c.ops->write == NULL)) { |
337 | err = -ENODEV; |
338 | goto __error; |
339 | } |
340 | } |
341 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
342 | if (data == NULL) { |
343 | err = -ENOMEM; |
344 | goto __error; |
345 | } |
346 | data->entry = entry; |
347 | switch (entry->content) { |
348 | case SNDRV_INFO_CONTENT_TEXT: |
349 | if (mode == O_RDONLY || mode == O_RDWR) { |
350 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
351 | if (buffer == NULL) |
352 | goto __nomem; |
353 | data->rbuffer = buffer; |
354 | buffer->len = PAGE_SIZE; |
355 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); |
356 | if (buffer->buffer == NULL) |
357 | goto __nomem; |
358 | } |
359 | if (mode == O_WRONLY || mode == O_RDWR) { |
360 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
361 | if (buffer == NULL) |
362 | goto __nomem; |
363 | data->wbuffer = buffer; |
364 | buffer->len = PAGE_SIZE; |
365 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); |
366 | if (buffer->buffer == NULL) |
367 | goto __nomem; |
368 | } |
369 | break; |
370 | case SNDRV_INFO_CONTENT_DATA: /* data */ |
371 | if (entry->c.ops->open) { |
372 | if ((err = entry->c.ops->open(entry, mode, |
373 | &data->file_private_data)) < 0) { |
374 | kfree(data); |
375 | goto __error; |
376 | } |
377 | } |
378 | break; |
379 | } |
380 | file->private_data = data; |
381 | mutex_unlock(&info_mutex); |
382 | if (entry->content == SNDRV_INFO_CONTENT_TEXT && |
383 | (mode == O_RDONLY || mode == O_RDWR)) { |
384 | if (entry->c.text.read) { |
385 | mutex_lock(&entry->access); |
386 | entry->c.text.read(entry, data->rbuffer); |
387 | mutex_unlock(&entry->access); |
388 | } |
389 | } |
390 | return 0; |
391 | |
392 | __nomem: |
393 | if (data->rbuffer) { |
394 | kfree(data->rbuffer->buffer); |
395 | kfree(data->rbuffer); |
396 | } |
397 | if (data->wbuffer) { |
398 | kfree(data->wbuffer->buffer); |
399 | kfree(data->wbuffer); |
400 | } |
401 | kfree(data); |
402 | err = -ENOMEM; |
403 | __error: |
404 | module_put(entry->module); |
405 | __error1: |
406 | mutex_unlock(&info_mutex); |
407 | return err; |
408 | } |
409 | |
410 | static int snd_info_entry_release(struct inode *inode, struct file *file) |
411 | { |
412 | struct snd_info_entry *entry; |
413 | struct snd_info_private_data *data; |
414 | int mode; |
415 | |
416 | mode = file->f_flags & O_ACCMODE; |
417 | data = file->private_data; |
418 | entry = data->entry; |
419 | switch (entry->content) { |
420 | case SNDRV_INFO_CONTENT_TEXT: |
421 | if (data->rbuffer) { |
422 | kfree(data->rbuffer->buffer); |
423 | kfree(data->rbuffer); |
424 | } |
425 | if (data->wbuffer) { |
426 | if (entry->c.text.write) { |
427 | entry->c.text.write(entry, data->wbuffer); |
428 | if (data->wbuffer->error) { |
429 | snd_printk(KERN_WARNING "data write error to %s (%i)\n", |
430 | entry->name, |
431 | data->wbuffer->error); |
432 | } |
433 | } |
434 | kfree(data->wbuffer->buffer); |
435 | kfree(data->wbuffer); |
436 | } |
437 | break; |
438 | case SNDRV_INFO_CONTENT_DATA: |
439 | if (entry->c.ops->release) |
440 | entry->c.ops->release(entry, mode, |
441 | data->file_private_data); |
442 | break; |
443 | } |
444 | module_put(entry->module); |
445 | kfree(data); |
446 | return 0; |
447 | } |
448 | |
449 | static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait) |
450 | { |
451 | struct snd_info_private_data *data; |
452 | struct snd_info_entry *entry; |
453 | unsigned int mask; |
454 | |
455 | data = file->private_data; |
456 | if (data == NULL) |
457 | return 0; |
458 | entry = data->entry; |
459 | mask = 0; |
460 | switch (entry->content) { |
461 | case SNDRV_INFO_CONTENT_DATA: |
462 | if (entry->c.ops->poll) |
463 | return entry->c.ops->poll(entry, |
464 | data->file_private_data, |
465 | file, wait); |
466 | if (entry->c.ops->read) |
467 | mask |= POLLIN | POLLRDNORM; |
468 | if (entry->c.ops->write) |
469 | mask |= POLLOUT | POLLWRNORM; |
470 | break; |
471 | } |
472 | return mask; |
473 | } |
474 | |
475 | static long snd_info_entry_ioctl(struct file *file, unsigned int cmd, |
476 | unsigned long arg) |
477 | { |
478 | struct snd_info_private_data *data; |
479 | struct snd_info_entry *entry; |
480 | |
481 | data = file->private_data; |
482 | if (data == NULL) |
483 | return 0; |
484 | entry = data->entry; |
485 | switch (entry->content) { |
486 | case SNDRV_INFO_CONTENT_DATA: |
487 | if (entry->c.ops->ioctl) |
488 | return entry->c.ops->ioctl(entry, |
489 | data->file_private_data, |
490 | file, cmd, arg); |
491 | break; |
492 | } |
493 | return -ENOTTY; |
494 | } |
495 | |
496 | static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma) |
497 | { |
498 | struct inode *inode = file->f_path.dentry->d_inode; |
499 | struct snd_info_private_data *data; |
500 | struct snd_info_entry *entry; |
501 | |
502 | data = file->private_data; |
503 | if (data == NULL) |
504 | return 0; |
505 | entry = data->entry; |
506 | switch (entry->content) { |
507 | case SNDRV_INFO_CONTENT_DATA: |
508 | if (entry->c.ops->mmap) |
509 | return entry->c.ops->mmap(entry, |
510 | data->file_private_data, |
511 | inode, file, vma); |
512 | break; |
513 | } |
514 | return -ENXIO; |
515 | } |
516 | |
517 | static const struct file_operations snd_info_entry_operations = |
518 | { |
519 | .owner = THIS_MODULE, |
520 | .llseek = snd_info_entry_llseek, |
521 | .read = snd_info_entry_read, |
522 | .write = snd_info_entry_write, |
523 | .poll = snd_info_entry_poll, |
524 | .unlocked_ioctl = snd_info_entry_ioctl, |
525 | .mmap = snd_info_entry_mmap, |
526 | .open = snd_info_entry_open, |
527 | .release = snd_info_entry_release, |
528 | }; |
529 | |
530 | int __init snd_info_init(void) |
531 | { |
532 | struct proc_dir_entry *p; |
533 | |
534 | p = create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, NULL); |
535 | if (p == NULL) |
536 | return -ENOMEM; |
537 | snd_proc_root = p; |
538 | #ifdef CONFIG_SND_OSSEMUL |
539 | { |
540 | struct snd_info_entry *entry; |
541 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL) |
542 | return -ENOMEM; |
543 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; |
544 | if (snd_info_register(entry) < 0) { |
545 | snd_info_free_entry(entry); |
546 | return -ENOMEM; |
547 | } |
548 | snd_oss_root = entry; |
549 | } |
550 | #endif |
551 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) |
552 | { |
553 | struct snd_info_entry *entry; |
554 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL) |
555 | return -ENOMEM; |
556 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; |
557 | if (snd_info_register(entry) < 0) { |
558 | snd_info_free_entry(entry); |
559 | return -ENOMEM; |
560 | } |
561 | snd_seq_root = entry; |
562 | } |
563 | #endif |
564 | snd_info_version_init(); |
565 | snd_minor_info_init(); |
566 | snd_minor_info_oss_init(); |
567 | snd_card_info_init(); |
568 | return 0; |
569 | } |
570 | |
571 | int __exit snd_info_done(void) |
572 | { |
573 | snd_card_info_done(); |
574 | snd_minor_info_oss_done(); |
575 | snd_minor_info_done(); |
576 | snd_info_version_done(); |
577 | if (snd_proc_root) { |
578 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) |
579 | snd_info_free_entry(snd_seq_root); |
580 | #endif |
581 | #ifdef CONFIG_SND_OSSEMUL |
582 | snd_info_free_entry(snd_oss_root); |
583 | #endif |
584 | snd_remove_proc_entry(NULL, snd_proc_root); |
585 | } |
586 | return 0; |
587 | } |
588 | |
589 | /* |
590 | |
591 | */ |
592 | |
593 | |
594 | /* |
595 | * create a card proc file |
596 | * called from init.c |
597 | */ |
598 | int snd_info_card_create(struct snd_card *card) |
599 | { |
600 | char str[8]; |
601 | struct snd_info_entry *entry; |
602 | |
603 | if (snd_BUG_ON(!card)) |
604 | return -ENXIO; |
605 | |
606 | sprintf(str, "card%i", card->number); |
607 | if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL) |
608 | return -ENOMEM; |
609 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; |
610 | if (snd_info_register(entry) < 0) { |
611 | snd_info_free_entry(entry); |
612 | return -ENOMEM; |
613 | } |
614 | card->proc_root = entry; |
615 | return 0; |
616 | } |
617 | |
618 | /* |
619 | * register the card proc file |
620 | * called from init.c |
621 | */ |
622 | int snd_info_card_register(struct snd_card *card) |
623 | { |
624 | struct proc_dir_entry *p; |
625 | |
626 | if (snd_BUG_ON(!card)) |
627 | return -ENXIO; |
628 | |
629 | if (!strcmp(card->id, card->proc_root->name)) |
630 | return 0; |
631 | |
632 | p = proc_symlink(card->id, snd_proc_root, card->proc_root->name); |
633 | if (p == NULL) |
634 | return -ENOMEM; |
635 | card->proc_root_link = p; |
636 | return 0; |
637 | } |
638 | |
639 | /* |
640 | * called on card->id change |
641 | */ |
642 | void snd_info_card_id_change(struct snd_card *card) |
643 | { |
644 | mutex_lock(&info_mutex); |
645 | if (card->proc_root_link) { |
646 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); |
647 | card->proc_root_link = NULL; |
648 | } |
649 | if (strcmp(card->id, card->proc_root->name)) |
650 | card->proc_root_link = proc_symlink(card->id, |
651 | snd_proc_root, |
652 | card->proc_root->name); |
653 | mutex_unlock(&info_mutex); |
654 | } |
655 | |
656 | /* |
657 | * de-register the card proc file |
658 | * called from init.c |
659 | */ |
660 | void snd_info_card_disconnect(struct snd_card *card) |
661 | { |
662 | if (!card) |
663 | return; |
664 | mutex_lock(&info_mutex); |
665 | if (card->proc_root_link) { |
666 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); |
667 | card->proc_root_link = NULL; |
668 | } |
669 | if (card->proc_root) |
670 | snd_info_disconnect(card->proc_root); |
671 | mutex_unlock(&info_mutex); |
672 | } |
673 | |
674 | /* |
675 | * release the card proc file resources |
676 | * called from init.c |
677 | */ |
678 | int snd_info_card_free(struct snd_card *card) |
679 | { |
680 | if (!card) |
681 | return 0; |
682 | snd_info_free_entry(card->proc_root); |
683 | card->proc_root = NULL; |
684 | return 0; |
685 | } |
686 | |
687 | |
688 | /** |
689 | * snd_info_get_line - read one line from the procfs buffer |
690 | * @buffer: the procfs buffer |
691 | * @line: the buffer to store |
692 | * @len: the max. buffer size - 1 |
693 | * |
694 | * Reads one line from the buffer and stores the string. |
695 | * |
696 | * Returns zero if successful, or 1 if error or EOF. |
697 | */ |
698 | int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) |
699 | { |
700 | int c = -1; |
701 | |
702 | if (len <= 0 || buffer->stop || buffer->error) |
703 | return 1; |
704 | while (--len > 0) { |
705 | c = buffer->buffer[buffer->curr++]; |
706 | if (c == '\n') { |
707 | if (buffer->curr >= buffer->size) |
708 | buffer->stop = 1; |
709 | break; |
710 | } |
711 | *line++ = c; |
712 | if (buffer->curr >= buffer->size) { |
713 | buffer->stop = 1; |
714 | break; |
715 | } |
716 | } |
717 | while (c != '\n' && !buffer->stop) { |
718 | c = buffer->buffer[buffer->curr++]; |
719 | if (buffer->curr >= buffer->size) |
720 | buffer->stop = 1; |
721 | } |
722 | *line = '\0'; |
723 | return 0; |
724 | } |
725 | |
726 | EXPORT_SYMBOL(snd_info_get_line); |
727 | |
728 | /** |
729 | * snd_info_get_str - parse a string token |
730 | * @dest: the buffer to store the string token |
731 | * @src: the original string |
732 | * @len: the max. length of token - 1 |
733 | * |
734 | * Parses the original string and copy a token to the given |
735 | * string buffer. |
736 | * |
737 | * Returns the updated pointer of the original string so that |
738 | * it can be used for the next call. |
739 | */ |
740 | const char *snd_info_get_str(char *dest, const char *src, int len) |
741 | { |
742 | int c; |
743 | |
744 | while (*src == ' ' || *src == '\t') |
745 | src++; |
746 | if (*src == '"' || *src == '\'') { |
747 | c = *src++; |
748 | while (--len > 0 && *src && *src != c) { |
749 | *dest++ = *src++; |
750 | } |
751 | if (*src == c) |
752 | src++; |
753 | } else { |
754 | while (--len > 0 && *src && *src != ' ' && *src != '\t') { |
755 | *dest++ = *src++; |
756 | } |
757 | } |
758 | *dest = 0; |
759 | while (*src == ' ' || *src == '\t') |
760 | src++; |
761 | return src; |
762 | } |
763 | |
764 | EXPORT_SYMBOL(snd_info_get_str); |
765 | |
766 | /** |
767 | * snd_info_create_entry - create an info entry |
768 | * @name: the proc file name |
769 | * |
770 | * Creates an info entry with the given file name and initializes as |
771 | * the default state. |
772 | * |
773 | * Usually called from other functions such as |
774 | * snd_info_create_card_entry(). |
775 | * |
776 | * Returns the pointer of the new instance, or NULL on failure. |
777 | */ |
778 | static struct snd_info_entry *snd_info_create_entry(const char *name) |
779 | { |
780 | struct snd_info_entry *entry; |
781 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
782 | if (entry == NULL) |
783 | return NULL; |
784 | entry->name = kstrdup(name, GFP_KERNEL); |
785 | if (entry->name == NULL) { |
786 | kfree(entry); |
787 | return NULL; |
788 | } |
789 | entry->mode = S_IFREG | S_IRUGO; |
790 | entry->content = SNDRV_INFO_CONTENT_TEXT; |
791 | mutex_init(&entry->access); |
792 | INIT_LIST_HEAD(&entry->children); |
793 | INIT_LIST_HEAD(&entry->list); |
794 | return entry; |
795 | } |
796 | |
797 | /** |
798 | * snd_info_create_module_entry - create an info entry for the given module |
799 | * @module: the module pointer |
800 | * @name: the file name |
801 | * @parent: the parent directory |
802 | * |
803 | * Creates a new info entry and assigns it to the given module. |
804 | * |
805 | * Returns the pointer of the new instance, or NULL on failure. |
806 | */ |
807 | struct snd_info_entry *snd_info_create_module_entry(struct module * module, |
808 | const char *name, |
809 | struct snd_info_entry *parent) |
810 | { |
811 | struct snd_info_entry *entry = snd_info_create_entry(name); |
812 | if (entry) { |
813 | entry->module = module; |
814 | entry->parent = parent; |
815 | } |
816 | return entry; |
817 | } |
818 | |
819 | EXPORT_SYMBOL(snd_info_create_module_entry); |
820 | |
821 | /** |
822 | * snd_info_create_card_entry - create an info entry for the given card |
823 | * @card: the card instance |
824 | * @name: the file name |
825 | * @parent: the parent directory |
826 | * |
827 | * Creates a new info entry and assigns it to the given card. |
828 | * |
829 | * Returns the pointer of the new instance, or NULL on failure. |
830 | */ |
831 | struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, |
832 | const char *name, |
833 | struct snd_info_entry * parent) |
834 | { |
835 | struct snd_info_entry *entry = snd_info_create_entry(name); |
836 | if (entry) { |
837 | entry->module = card->module; |
838 | entry->card = card; |
839 | entry->parent = parent; |
840 | } |
841 | return entry; |
842 | } |
843 | |
844 | EXPORT_SYMBOL(snd_info_create_card_entry); |
845 | |
846 | static void snd_info_disconnect(struct snd_info_entry *entry) |
847 | { |
848 | struct list_head *p, *n; |
849 | struct proc_dir_entry *root; |
850 | |
851 | list_for_each_safe(p, n, &entry->children) { |
852 | snd_info_disconnect(list_entry(p, struct snd_info_entry, list)); |
853 | } |
854 | |
855 | if (! entry->p) |
856 | return; |
857 | list_del_init(&entry->list); |
858 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; |
859 | snd_BUG_ON(!root); |
860 | snd_remove_proc_entry(root, entry->p); |
861 | entry->p = NULL; |
862 | } |
863 | |
864 | static int snd_info_dev_free_entry(struct snd_device *device) |
865 | { |
866 | struct snd_info_entry *entry = device->device_data; |
867 | snd_info_free_entry(entry); |
868 | return 0; |
869 | } |
870 | |
871 | static int snd_info_dev_register_entry(struct snd_device *device) |
872 | { |
873 | struct snd_info_entry *entry = device->device_data; |
874 | return snd_info_register(entry); |
875 | } |
876 | |
877 | /** |
878 | * snd_card_proc_new - create an info entry for the given card |
879 | * @card: the card instance |
880 | * @name: the file name |
881 | * @entryp: the pointer to store the new info entry |
882 | * |
883 | * Creates a new info entry and assigns it to the given card. |
884 | * Unlike snd_info_create_card_entry(), this function registers the |
885 | * info entry as an ALSA device component, so that it can be |
886 | * unregistered/released without explicit call. |
887 | * Also, you don't have to register this entry via snd_info_register(), |
888 | * since this will be registered by snd_card_register() automatically. |
889 | * |
890 | * The parent is assumed as card->proc_root. |
891 | * |
892 | * For releasing this entry, use snd_device_free() instead of |
893 | * snd_info_free_entry(). |
894 | * |
895 | * Returns zero if successful, or a negative error code on failure. |
896 | */ |
897 | int snd_card_proc_new(struct snd_card *card, const char *name, |
898 | struct snd_info_entry **entryp) |
899 | { |
900 | static struct snd_device_ops ops = { |
901 | .dev_free = snd_info_dev_free_entry, |
902 | .dev_register = snd_info_dev_register_entry, |
903 | /* disconnect is done via snd_info_card_disconnect() */ |
904 | }; |
905 | struct snd_info_entry *entry; |
906 | int err; |
907 | |
908 | entry = snd_info_create_card_entry(card, name, card->proc_root); |
909 | if (! entry) |
910 | return -ENOMEM; |
911 | if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) { |
912 | snd_info_free_entry(entry); |
913 | return err; |
914 | } |
915 | if (entryp) |
916 | *entryp = entry; |
917 | return 0; |
918 | } |
919 | |
920 | EXPORT_SYMBOL(snd_card_proc_new); |
921 | |
922 | /** |
923 | * snd_info_free_entry - release the info entry |
924 | * @entry: the info entry |
925 | * |
926 | * Releases the info entry. Don't call this after registered. |
927 | */ |
928 | void snd_info_free_entry(struct snd_info_entry * entry) |
929 | { |
930 | if (entry == NULL) |
931 | return; |
932 | if (entry->p) { |
933 | mutex_lock(&info_mutex); |
934 | snd_info_disconnect(entry); |
935 | mutex_unlock(&info_mutex); |
936 | } |
937 | kfree(entry->name); |
938 | if (entry->private_free) |
939 | entry->private_free(entry); |
940 | kfree(entry); |
941 | } |
942 | |
943 | EXPORT_SYMBOL(snd_info_free_entry); |
944 | |
945 | /** |
946 | * snd_info_register - register the info entry |
947 | * @entry: the info entry |
948 | * |
949 | * Registers the proc info entry. |
950 | * |
951 | * Returns zero if successful, or a negative error code on failure. |
952 | */ |
953 | int snd_info_register(struct snd_info_entry * entry) |
954 | { |
955 | struct proc_dir_entry *root, *p = NULL; |
956 | |
957 | if (snd_BUG_ON(!entry)) |
958 | return -ENXIO; |
959 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; |
960 | mutex_lock(&info_mutex); |
961 | p = create_proc_entry(entry->name, entry->mode, root); |
962 | if (!p) { |
963 | mutex_unlock(&info_mutex); |
964 | return -ENOMEM; |
965 | } |
966 | if (!S_ISDIR(entry->mode)) |
967 | p->proc_fops = &snd_info_entry_operations; |
968 | p->size = entry->size; |
969 | p->data = entry; |
970 | entry->p = p; |
971 | if (entry->parent) |
972 | list_add_tail(&entry->list, &entry->parent->children); |
973 | mutex_unlock(&info_mutex); |
974 | return 0; |
975 | } |
976 | |
977 | EXPORT_SYMBOL(snd_info_register); |
978 | |
979 | /* |
980 | |
981 | */ |
982 | |
983 | static struct snd_info_entry *snd_info_version_entry; |
984 | |
985 | static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) |
986 | { |
987 | snd_iprintf(buffer, |
988 | "Advanced Linux Sound Architecture Driver Version " |
989 | CONFIG_SND_VERSION CONFIG_SND_DATE ".\n" |
990 | ); |
991 | } |
992 | |
993 | static int __init snd_info_version_init(void) |
994 | { |
995 | struct snd_info_entry *entry; |
996 | |
997 | entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL); |
998 | if (entry == NULL) |
999 | return -ENOMEM; |
1000 | entry->c.text.read = snd_info_version_read; |
1001 | if (snd_info_register(entry) < 0) { |
1002 | snd_info_free_entry(entry); |
1003 | return -ENOMEM; |
1004 | } |
1005 | snd_info_version_entry = entry; |
1006 | return 0; |
1007 | } |
1008 | |
1009 | static int __exit snd_info_version_done(void) |
1010 | { |
1011 | snd_info_free_entry(snd_info_version_entry); |
1012 | return 0; |
1013 | } |
1014 | |
1015 | #endif /* CONFIG_PROC_FS */ |
1016 |
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