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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 = -EINVAL, size; |
168 | |
169 | data = file->private_data; |
170 | entry = data->entry; |
171 | mutex_lock(&entry->access); |
172 | if (entry->content == SNDRV_INFO_CONTENT_DATA && |
173 | entry->c.ops->llseek) { |
174 | offset = entry->c.ops->llseek(entry, |
175 | data->file_private_data, |
176 | file, offset, orig); |
177 | goto out; |
178 | } |
179 | if (entry->content == SNDRV_INFO_CONTENT_DATA) |
180 | size = entry->size; |
181 | else |
182 | size = 0; |
183 | switch (orig) { |
184 | case SEEK_SET: |
185 | break; |
186 | case SEEK_CUR: |
187 | offset += file->f_pos; |
188 | break; |
189 | case SEEK_END: |
190 | if (!size) |
191 | goto out; |
192 | offset += size; |
193 | break; |
194 | default: |
195 | goto out; |
196 | } |
197 | if (offset < 0) |
198 | goto out; |
199 | if (size && offset > size) |
200 | offset = size; |
201 | file->f_pos = offset; |
202 | ret = offset; |
203 | out: |
204 | mutex_unlock(&entry->access); |
205 | return ret; |
206 | } |
207 | |
208 | static ssize_t snd_info_entry_read(struct file *file, char __user *buffer, |
209 | size_t count, loff_t * offset) |
210 | { |
211 | struct snd_info_private_data *data; |
212 | struct snd_info_entry *entry; |
213 | struct snd_info_buffer *buf; |
214 | size_t size = 0; |
215 | loff_t pos; |
216 | |
217 | data = file->private_data; |
218 | if (snd_BUG_ON(!data)) |
219 | return -ENXIO; |
220 | pos = *offset; |
221 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) |
222 | return -EIO; |
223 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) |
224 | return -EIO; |
225 | entry = data->entry; |
226 | switch (entry->content) { |
227 | case SNDRV_INFO_CONTENT_TEXT: |
228 | buf = data->rbuffer; |
229 | if (buf == NULL) |
230 | return -EIO; |
231 | if (pos >= buf->size) |
232 | return 0; |
233 | size = buf->size - pos; |
234 | size = min(count, size); |
235 | if (copy_to_user(buffer, buf->buffer + pos, size)) |
236 | return -EFAULT; |
237 | break; |
238 | case SNDRV_INFO_CONTENT_DATA: |
239 | if (pos >= entry->size) |
240 | return 0; |
241 | if (entry->c.ops->read) { |
242 | size = entry->size - pos; |
243 | size = min(count, size); |
244 | size = entry->c.ops->read(entry, |
245 | data->file_private_data, |
246 | file, buffer, size, pos); |
247 | } |
248 | break; |
249 | } |
250 | if ((ssize_t) size > 0) |
251 | *offset = pos + size; |
252 | return size; |
253 | } |
254 | |
255 | static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer, |
256 | size_t count, loff_t * offset) |
257 | { |
258 | struct snd_info_private_data *data; |
259 | struct snd_info_entry *entry; |
260 | struct snd_info_buffer *buf; |
261 | ssize_t size = 0; |
262 | loff_t pos; |
263 | |
264 | data = file->private_data; |
265 | if (snd_BUG_ON(!data)) |
266 | return -ENXIO; |
267 | entry = data->entry; |
268 | pos = *offset; |
269 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) |
270 | return -EIO; |
271 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) |
272 | return -EIO; |
273 | switch (entry->content) { |
274 | case SNDRV_INFO_CONTENT_TEXT: |
275 | buf = data->wbuffer; |
276 | if (buf == NULL) |
277 | return -EIO; |
278 | mutex_lock(&entry->access); |
279 | if (pos + count >= buf->len) { |
280 | if (resize_info_buffer(buf, pos + count)) { |
281 | mutex_unlock(&entry->access); |
282 | return -ENOMEM; |
283 | } |
284 | } |
285 | if (copy_from_user(buf->buffer + pos, buffer, count)) { |
286 | mutex_unlock(&entry->access); |
287 | return -EFAULT; |
288 | } |
289 | buf->size = pos + count; |
290 | mutex_unlock(&entry->access); |
291 | size = count; |
292 | break; |
293 | case SNDRV_INFO_CONTENT_DATA: |
294 | if (entry->c.ops->write && count > 0) { |
295 | size_t maxsize = entry->size - pos; |
296 | count = min(count, maxsize); |
297 | size = entry->c.ops->write(entry, |
298 | data->file_private_data, |
299 | file, buffer, count, pos); |
300 | } |
301 | break; |
302 | } |
303 | if ((ssize_t) size > 0) |
304 | *offset = pos + size; |
305 | return size; |
306 | } |
307 | |
308 | static int snd_info_entry_open(struct inode *inode, struct file *file) |
309 | { |
310 | struct snd_info_entry *entry; |
311 | struct snd_info_private_data *data; |
312 | struct snd_info_buffer *buffer; |
313 | struct proc_dir_entry *p; |
314 | int mode, err; |
315 | |
316 | mutex_lock(&info_mutex); |
317 | p = PDE(inode); |
318 | entry = p == NULL ? NULL : (struct snd_info_entry *)p->data; |
319 | if (entry == NULL || ! entry->p) { |
320 | mutex_unlock(&info_mutex); |
321 | return -ENODEV; |
322 | } |
323 | if (!try_module_get(entry->module)) { |
324 | err = -EFAULT; |
325 | goto __error1; |
326 | } |
327 | mode = file->f_flags & O_ACCMODE; |
328 | if (mode == O_RDONLY || mode == O_RDWR) { |
329 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
330 | entry->c.ops->read == NULL)) { |
331 | err = -ENODEV; |
332 | goto __error; |
333 | } |
334 | } |
335 | if (mode == O_WRONLY || mode == O_RDWR) { |
336 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
337 | entry->c.ops->write == NULL)) { |
338 | err = -ENODEV; |
339 | goto __error; |
340 | } |
341 | } |
342 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
343 | if (data == NULL) { |
344 | err = -ENOMEM; |
345 | goto __error; |
346 | } |
347 | data->entry = entry; |
348 | switch (entry->content) { |
349 | case SNDRV_INFO_CONTENT_TEXT: |
350 | if (mode == O_RDONLY || mode == O_RDWR) { |
351 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
352 | if (buffer == NULL) |
353 | goto __nomem; |
354 | data->rbuffer = buffer; |
355 | buffer->len = PAGE_SIZE; |
356 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); |
357 | if (buffer->buffer == NULL) |
358 | goto __nomem; |
359 | } |
360 | if (mode == O_WRONLY || mode == O_RDWR) { |
361 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
362 | if (buffer == NULL) |
363 | goto __nomem; |
364 | data->wbuffer = buffer; |
365 | buffer->len = PAGE_SIZE; |
366 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); |
367 | if (buffer->buffer == NULL) |
368 | goto __nomem; |
369 | } |
370 | break; |
371 | case SNDRV_INFO_CONTENT_DATA: /* data */ |
372 | if (entry->c.ops->open) { |
373 | if ((err = entry->c.ops->open(entry, mode, |
374 | &data->file_private_data)) < 0) { |
375 | kfree(data); |
376 | goto __error; |
377 | } |
378 | } |
379 | break; |
380 | } |
381 | file->private_data = data; |
382 | mutex_unlock(&info_mutex); |
383 | if (entry->content == SNDRV_INFO_CONTENT_TEXT && |
384 | (mode == O_RDONLY || mode == O_RDWR)) { |
385 | if (entry->c.text.read) { |
386 | mutex_lock(&entry->access); |
387 | entry->c.text.read(entry, data->rbuffer); |
388 | mutex_unlock(&entry->access); |
389 | } |
390 | } |
391 | return 0; |
392 | |
393 | __nomem: |
394 | if (data->rbuffer) { |
395 | kfree(data->rbuffer->buffer); |
396 | kfree(data->rbuffer); |
397 | } |
398 | if (data->wbuffer) { |
399 | kfree(data->wbuffer->buffer); |
400 | kfree(data->wbuffer); |
401 | } |
402 | kfree(data); |
403 | err = -ENOMEM; |
404 | __error: |
405 | module_put(entry->module); |
406 | __error1: |
407 | mutex_unlock(&info_mutex); |
408 | return err; |
409 | } |
410 | |
411 | static int snd_info_entry_release(struct inode *inode, struct file *file) |
412 | { |
413 | struct snd_info_entry *entry; |
414 | struct snd_info_private_data *data; |
415 | int mode; |
416 | |
417 | mode = file->f_flags & O_ACCMODE; |
418 | data = file->private_data; |
419 | entry = data->entry; |
420 | switch (entry->content) { |
421 | case SNDRV_INFO_CONTENT_TEXT: |
422 | if (data->rbuffer) { |
423 | kfree(data->rbuffer->buffer); |
424 | kfree(data->rbuffer); |
425 | } |
426 | if (data->wbuffer) { |
427 | if (entry->c.text.write) { |
428 | entry->c.text.write(entry, data->wbuffer); |
429 | if (data->wbuffer->error) { |
430 | snd_printk(KERN_WARNING "data write error to %s (%i)\n", |
431 | entry->name, |
432 | data->wbuffer->error); |
433 | } |
434 | } |
435 | kfree(data->wbuffer->buffer); |
436 | kfree(data->wbuffer); |
437 | } |
438 | break; |
439 | case SNDRV_INFO_CONTENT_DATA: |
440 | if (entry->c.ops->release) |
441 | entry->c.ops->release(entry, mode, |
442 | data->file_private_data); |
443 | break; |
444 | } |
445 | module_put(entry->module); |
446 | kfree(data); |
447 | return 0; |
448 | } |
449 | |
450 | static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait) |
451 | { |
452 | struct snd_info_private_data *data; |
453 | struct snd_info_entry *entry; |
454 | unsigned int mask; |
455 | |
456 | data = file->private_data; |
457 | if (data == NULL) |
458 | return 0; |
459 | entry = data->entry; |
460 | mask = 0; |
461 | switch (entry->content) { |
462 | case SNDRV_INFO_CONTENT_DATA: |
463 | if (entry->c.ops->poll) |
464 | return entry->c.ops->poll(entry, |
465 | data->file_private_data, |
466 | file, wait); |
467 | if (entry->c.ops->read) |
468 | mask |= POLLIN | POLLRDNORM; |
469 | if (entry->c.ops->write) |
470 | mask |= POLLOUT | POLLWRNORM; |
471 | break; |
472 | } |
473 | return mask; |
474 | } |
475 | |
476 | static long snd_info_entry_ioctl(struct file *file, unsigned int cmd, |
477 | unsigned long arg) |
478 | { |
479 | struct snd_info_private_data *data; |
480 | struct snd_info_entry *entry; |
481 | |
482 | data = file->private_data; |
483 | if (data == NULL) |
484 | return 0; |
485 | entry = data->entry; |
486 | switch (entry->content) { |
487 | case SNDRV_INFO_CONTENT_DATA: |
488 | if (entry->c.ops->ioctl) |
489 | return entry->c.ops->ioctl(entry, |
490 | data->file_private_data, |
491 | file, cmd, arg); |
492 | break; |
493 | } |
494 | return -ENOTTY; |
495 | } |
496 | |
497 | static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma) |
498 | { |
499 | struct inode *inode = file->f_path.dentry->d_inode; |
500 | struct snd_info_private_data *data; |
501 | struct snd_info_entry *entry; |
502 | |
503 | data = file->private_data; |
504 | if (data == NULL) |
505 | return 0; |
506 | entry = data->entry; |
507 | switch (entry->content) { |
508 | case SNDRV_INFO_CONTENT_DATA: |
509 | if (entry->c.ops->mmap) |
510 | return entry->c.ops->mmap(entry, |
511 | data->file_private_data, |
512 | inode, file, vma); |
513 | break; |
514 | } |
515 | return -ENXIO; |
516 | } |
517 | |
518 | static const struct file_operations snd_info_entry_operations = |
519 | { |
520 | .owner = THIS_MODULE, |
521 | .llseek = snd_info_entry_llseek, |
522 | .read = snd_info_entry_read, |
523 | .write = snd_info_entry_write, |
524 | .poll = snd_info_entry_poll, |
525 | .unlocked_ioctl = snd_info_entry_ioctl, |
526 | .mmap = snd_info_entry_mmap, |
527 | .open = snd_info_entry_open, |
528 | .release = snd_info_entry_release, |
529 | }; |
530 | |
531 | int __init snd_info_init(void) |
532 | { |
533 | struct proc_dir_entry *p; |
534 | |
535 | p = create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, NULL); |
536 | if (p == NULL) |
537 | return -ENOMEM; |
538 | snd_proc_root = p; |
539 | #ifdef CONFIG_SND_OSSEMUL |
540 | { |
541 | struct snd_info_entry *entry; |
542 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", 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_oss_root = entry; |
550 | } |
551 | #endif |
552 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) |
553 | { |
554 | struct snd_info_entry *entry; |
555 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL) |
556 | return -ENOMEM; |
557 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; |
558 | if (snd_info_register(entry) < 0) { |
559 | snd_info_free_entry(entry); |
560 | return -ENOMEM; |
561 | } |
562 | snd_seq_root = entry; |
563 | } |
564 | #endif |
565 | snd_info_version_init(); |
566 | snd_minor_info_init(); |
567 | snd_minor_info_oss_init(); |
568 | snd_card_info_init(); |
569 | return 0; |
570 | } |
571 | |
572 | int __exit snd_info_done(void) |
573 | { |
574 | snd_card_info_done(); |
575 | snd_minor_info_oss_done(); |
576 | snd_minor_info_done(); |
577 | snd_info_version_done(); |
578 | if (snd_proc_root) { |
579 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) |
580 | snd_info_free_entry(snd_seq_root); |
581 | #endif |
582 | #ifdef CONFIG_SND_OSSEMUL |
583 | snd_info_free_entry(snd_oss_root); |
584 | #endif |
585 | snd_remove_proc_entry(NULL, snd_proc_root); |
586 | } |
587 | return 0; |
588 | } |
589 | |
590 | /* |
591 | |
592 | */ |
593 | |
594 | |
595 | /* |
596 | * create a card proc file |
597 | * called from init.c |
598 | */ |
599 | int snd_info_card_create(struct snd_card *card) |
600 | { |
601 | char str[8]; |
602 | struct snd_info_entry *entry; |
603 | |
604 | if (snd_BUG_ON(!card)) |
605 | return -ENXIO; |
606 | |
607 | sprintf(str, "card%i", card->number); |
608 | if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL) |
609 | return -ENOMEM; |
610 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; |
611 | if (snd_info_register(entry) < 0) { |
612 | snd_info_free_entry(entry); |
613 | return -ENOMEM; |
614 | } |
615 | card->proc_root = entry; |
616 | return 0; |
617 | } |
618 | |
619 | /* |
620 | * register the card proc file |
621 | * called from init.c |
622 | */ |
623 | int snd_info_card_register(struct snd_card *card) |
624 | { |
625 | struct proc_dir_entry *p; |
626 | |
627 | if (snd_BUG_ON(!card)) |
628 | return -ENXIO; |
629 | |
630 | if (!strcmp(card->id, card->proc_root->name)) |
631 | return 0; |
632 | |
633 | p = proc_symlink(card->id, snd_proc_root, card->proc_root->name); |
634 | if (p == NULL) |
635 | return -ENOMEM; |
636 | card->proc_root_link = p; |
637 | return 0; |
638 | } |
639 | |
640 | /* |
641 | * called on card->id change |
642 | */ |
643 | void snd_info_card_id_change(struct snd_card *card) |
644 | { |
645 | mutex_lock(&info_mutex); |
646 | if (card->proc_root_link) { |
647 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); |
648 | card->proc_root_link = NULL; |
649 | } |
650 | if (strcmp(card->id, card->proc_root->name)) |
651 | card->proc_root_link = proc_symlink(card->id, |
652 | snd_proc_root, |
653 | card->proc_root->name); |
654 | mutex_unlock(&info_mutex); |
655 | } |
656 | |
657 | /* |
658 | * de-register the card proc file |
659 | * called from init.c |
660 | */ |
661 | void snd_info_card_disconnect(struct snd_card *card) |
662 | { |
663 | if (!card) |
664 | return; |
665 | mutex_lock(&info_mutex); |
666 | if (card->proc_root_link) { |
667 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); |
668 | card->proc_root_link = NULL; |
669 | } |
670 | if (card->proc_root) |
671 | snd_info_disconnect(card->proc_root); |
672 | mutex_unlock(&info_mutex); |
673 | } |
674 | |
675 | /* |
676 | * release the card proc file resources |
677 | * called from init.c |
678 | */ |
679 | int snd_info_card_free(struct snd_card *card) |
680 | { |
681 | if (!card) |
682 | return 0; |
683 | snd_info_free_entry(card->proc_root); |
684 | card->proc_root = NULL; |
685 | return 0; |
686 | } |
687 | |
688 | |
689 | /** |
690 | * snd_info_get_line - read one line from the procfs buffer |
691 | * @buffer: the procfs buffer |
692 | * @line: the buffer to store |
693 | * @len: the max. buffer size - 1 |
694 | * |
695 | * Reads one line from the buffer and stores the string. |
696 | * |
697 | * Returns zero if successful, or 1 if error or EOF. |
698 | */ |
699 | int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) |
700 | { |
701 | int c = -1; |
702 | |
703 | if (len <= 0 || buffer->stop || buffer->error) |
704 | return 1; |
705 | while (--len > 0) { |
706 | c = buffer->buffer[buffer->curr++]; |
707 | if (c == '\n') { |
708 | if (buffer->curr >= buffer->size) |
709 | buffer->stop = 1; |
710 | break; |
711 | } |
712 | *line++ = c; |
713 | if (buffer->curr >= buffer->size) { |
714 | buffer->stop = 1; |
715 | break; |
716 | } |
717 | } |
718 | while (c != '\n' && !buffer->stop) { |
719 | c = buffer->buffer[buffer->curr++]; |
720 | if (buffer->curr >= buffer->size) |
721 | buffer->stop = 1; |
722 | } |
723 | *line = '\0'; |
724 | return 0; |
725 | } |
726 | |
727 | EXPORT_SYMBOL(snd_info_get_line); |
728 | |
729 | /** |
730 | * snd_info_get_str - parse a string token |
731 | * @dest: the buffer to store the string token |
732 | * @src: the original string |
733 | * @len: the max. length of token - 1 |
734 | * |
735 | * Parses the original string and copy a token to the given |
736 | * string buffer. |
737 | * |
738 | * Returns the updated pointer of the original string so that |
739 | * it can be used for the next call. |
740 | */ |
741 | const char *snd_info_get_str(char *dest, const char *src, int len) |
742 | { |
743 | int c; |
744 | |
745 | while (*src == ' ' || *src == '\t') |
746 | src++; |
747 | if (*src == '"' || *src == '\'') { |
748 | c = *src++; |
749 | while (--len > 0 && *src && *src != c) { |
750 | *dest++ = *src++; |
751 | } |
752 | if (*src == c) |
753 | src++; |
754 | } else { |
755 | while (--len > 0 && *src && *src != ' ' && *src != '\t') { |
756 | *dest++ = *src++; |
757 | } |
758 | } |
759 | *dest = 0; |
760 | while (*src == ' ' || *src == '\t') |
761 | src++; |
762 | return src; |
763 | } |
764 | |
765 | EXPORT_SYMBOL(snd_info_get_str); |
766 | |
767 | /** |
768 | * snd_info_create_entry - create an info entry |
769 | * @name: the proc file name |
770 | * |
771 | * Creates an info entry with the given file name and initializes as |
772 | * the default state. |
773 | * |
774 | * Usually called from other functions such as |
775 | * snd_info_create_card_entry(). |
776 | * |
777 | * Returns the pointer of the new instance, or NULL on failure. |
778 | */ |
779 | static struct snd_info_entry *snd_info_create_entry(const char *name) |
780 | { |
781 | struct snd_info_entry *entry; |
782 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
783 | if (entry == NULL) |
784 | return NULL; |
785 | entry->name = kstrdup(name, GFP_KERNEL); |
786 | if (entry->name == NULL) { |
787 | kfree(entry); |
788 | return NULL; |
789 | } |
790 | entry->mode = S_IFREG | S_IRUGO; |
791 | entry->content = SNDRV_INFO_CONTENT_TEXT; |
792 | mutex_init(&entry->access); |
793 | INIT_LIST_HEAD(&entry->children); |
794 | INIT_LIST_HEAD(&entry->list); |
795 | return entry; |
796 | } |
797 | |
798 | /** |
799 | * snd_info_create_module_entry - create an info entry for the given module |
800 | * @module: the module pointer |
801 | * @name: the file name |
802 | * @parent: the parent directory |
803 | * |
804 | * Creates a new info entry and assigns it to the given module. |
805 | * |
806 | * Returns the pointer of the new instance, or NULL on failure. |
807 | */ |
808 | struct snd_info_entry *snd_info_create_module_entry(struct module * module, |
809 | const char *name, |
810 | struct snd_info_entry *parent) |
811 | { |
812 | struct snd_info_entry *entry = snd_info_create_entry(name); |
813 | if (entry) { |
814 | entry->module = module; |
815 | entry->parent = parent; |
816 | } |
817 | return entry; |
818 | } |
819 | |
820 | EXPORT_SYMBOL(snd_info_create_module_entry); |
821 | |
822 | /** |
823 | * snd_info_create_card_entry - create an info entry for the given card |
824 | * @card: the card instance |
825 | * @name: the file name |
826 | * @parent: the parent directory |
827 | * |
828 | * Creates a new info entry and assigns it to the given card. |
829 | * |
830 | * Returns the pointer of the new instance, or NULL on failure. |
831 | */ |
832 | struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, |
833 | const char *name, |
834 | struct snd_info_entry * parent) |
835 | { |
836 | struct snd_info_entry *entry = snd_info_create_entry(name); |
837 | if (entry) { |
838 | entry->module = card->module; |
839 | entry->card = card; |
840 | entry->parent = parent; |
841 | } |
842 | return entry; |
843 | } |
844 | |
845 | EXPORT_SYMBOL(snd_info_create_card_entry); |
846 | |
847 | static void snd_info_disconnect(struct snd_info_entry *entry) |
848 | { |
849 | struct list_head *p, *n; |
850 | struct proc_dir_entry *root; |
851 | |
852 | list_for_each_safe(p, n, &entry->children) { |
853 | snd_info_disconnect(list_entry(p, struct snd_info_entry, list)); |
854 | } |
855 | |
856 | if (! entry->p) |
857 | return; |
858 | list_del_init(&entry->list); |
859 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; |
860 | snd_BUG_ON(!root); |
861 | snd_remove_proc_entry(root, entry->p); |
862 | entry->p = NULL; |
863 | } |
864 | |
865 | static int snd_info_dev_free_entry(struct snd_device *device) |
866 | { |
867 | struct snd_info_entry *entry = device->device_data; |
868 | snd_info_free_entry(entry); |
869 | return 0; |
870 | } |
871 | |
872 | static int snd_info_dev_register_entry(struct snd_device *device) |
873 | { |
874 | struct snd_info_entry *entry = device->device_data; |
875 | return snd_info_register(entry); |
876 | } |
877 | |
878 | /** |
879 | * snd_card_proc_new - create an info entry for the given card |
880 | * @card: the card instance |
881 | * @name: the file name |
882 | * @entryp: the pointer to store the new info entry |
883 | * |
884 | * Creates a new info entry and assigns it to the given card. |
885 | * Unlike snd_info_create_card_entry(), this function registers the |
886 | * info entry as an ALSA device component, so that it can be |
887 | * unregistered/released without explicit call. |
888 | * Also, you don't have to register this entry via snd_info_register(), |
889 | * since this will be registered by snd_card_register() automatically. |
890 | * |
891 | * The parent is assumed as card->proc_root. |
892 | * |
893 | * For releasing this entry, use snd_device_free() instead of |
894 | * snd_info_free_entry(). |
895 | * |
896 | * Returns zero if successful, or a negative error code on failure. |
897 | */ |
898 | int snd_card_proc_new(struct snd_card *card, const char *name, |
899 | struct snd_info_entry **entryp) |
900 | { |
901 | static struct snd_device_ops ops = { |
902 | .dev_free = snd_info_dev_free_entry, |
903 | .dev_register = snd_info_dev_register_entry, |
904 | /* disconnect is done via snd_info_card_disconnect() */ |
905 | }; |
906 | struct snd_info_entry *entry; |
907 | int err; |
908 | |
909 | entry = snd_info_create_card_entry(card, name, card->proc_root); |
910 | if (! entry) |
911 | return -ENOMEM; |
912 | if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) { |
913 | snd_info_free_entry(entry); |
914 | return err; |
915 | } |
916 | if (entryp) |
917 | *entryp = entry; |
918 | return 0; |
919 | } |
920 | |
921 | EXPORT_SYMBOL(snd_card_proc_new); |
922 | |
923 | /** |
924 | * snd_info_free_entry - release the info entry |
925 | * @entry: the info entry |
926 | * |
927 | * Releases the info entry. Don't call this after registered. |
928 | */ |
929 | void snd_info_free_entry(struct snd_info_entry * entry) |
930 | { |
931 | if (entry == NULL) |
932 | return; |
933 | if (entry->p) { |
934 | mutex_lock(&info_mutex); |
935 | snd_info_disconnect(entry); |
936 | mutex_unlock(&info_mutex); |
937 | } |
938 | kfree(entry->name); |
939 | if (entry->private_free) |
940 | entry->private_free(entry); |
941 | kfree(entry); |
942 | } |
943 | |
944 | EXPORT_SYMBOL(snd_info_free_entry); |
945 | |
946 | /** |
947 | * snd_info_register - register the info entry |
948 | * @entry: the info entry |
949 | * |
950 | * Registers the proc info entry. |
951 | * |
952 | * Returns zero if successful, or a negative error code on failure. |
953 | */ |
954 | int snd_info_register(struct snd_info_entry * entry) |
955 | { |
956 | struct proc_dir_entry *root, *p = NULL; |
957 | |
958 | if (snd_BUG_ON(!entry)) |
959 | return -ENXIO; |
960 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; |
961 | mutex_lock(&info_mutex); |
962 | p = create_proc_entry(entry->name, entry->mode, root); |
963 | if (!p) { |
964 | mutex_unlock(&info_mutex); |
965 | return -ENOMEM; |
966 | } |
967 | if (!S_ISDIR(entry->mode)) |
968 | p->proc_fops = &snd_info_entry_operations; |
969 | p->size = entry->size; |
970 | p->data = entry; |
971 | entry->p = p; |
972 | if (entry->parent) |
973 | list_add_tail(&entry->list, &entry->parent->children); |
974 | mutex_unlock(&info_mutex); |
975 | return 0; |
976 | } |
977 | |
978 | EXPORT_SYMBOL(snd_info_register); |
979 | |
980 | /* |
981 | |
982 | */ |
983 | |
984 | static struct snd_info_entry *snd_info_version_entry; |
985 | |
986 | static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) |
987 | { |
988 | snd_iprintf(buffer, |
989 | "Advanced Linux Sound Architecture Driver Version " |
990 | CONFIG_SND_VERSION CONFIG_SND_DATE ".\n" |
991 | ); |
992 | } |
993 | |
994 | static int __init snd_info_version_init(void) |
995 | { |
996 | struct snd_info_entry *entry; |
997 | |
998 | entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL); |
999 | if (entry == NULL) |
1000 | return -ENOMEM; |
1001 | entry->c.text.read = snd_info_version_read; |
1002 | if (snd_info_register(entry) < 0) { |
1003 | snd_info_free_entry(entry); |
1004 | return -ENOMEM; |
1005 | } |
1006 | snd_info_version_entry = entry; |
1007 | return 0; |
1008 | } |
1009 | |
1010 | static int __exit snd_info_version_done(void) |
1011 | { |
1012 | snd_info_free_entry(snd_info_version_entry); |
1013 | return 0; |
1014 | } |
1015 | |
1016 | #endif /* CONFIG_PROC_FS */ |
1017 |
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