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