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