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1da177e4 LT |
1 | /* |
2 | * Information interface for ALSA driver | |
3 | * Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/vmalloc.h> | |
25 | #include <linux/time.h> | |
26 | #include <linux/smp_lock.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/devfs_fs_kernel.h> | |
33 | #include <stdarg.h> | |
34 | ||
35 | /* | |
36 | * | |
37 | */ | |
38 | ||
39 | int snd_info_check_reserved_words(const char *str) | |
40 | { | |
41 | static char *reserved[] = | |
42 | { | |
43 | "version", | |
44 | "meminfo", | |
45 | "memdebug", | |
46 | "detect", | |
47 | "devices", | |
48 | "oss", | |
49 | "cards", | |
50 | "timers", | |
51 | "synth", | |
52 | "pcm", | |
53 | "seq", | |
54 | NULL | |
55 | }; | |
56 | char **xstr = reserved; | |
57 | ||
58 | while (*xstr) { | |
59 | if (!strcmp(*xstr, str)) | |
60 | return 0; | |
61 | xstr++; | |
62 | } | |
63 | if (!strncmp(str, "card", 4)) | |
64 | return 0; | |
65 | return 1; | |
66 | } | |
67 | ||
68 | #ifdef CONFIG_PROC_FS | |
69 | ||
70 | static DECLARE_MUTEX(info_mutex); | |
71 | ||
72 | typedef struct _snd_info_private_data { | |
73 | snd_info_buffer_t *rbuffer; | |
74 | snd_info_buffer_t *wbuffer; | |
75 | snd_info_entry_t *entry; | |
76 | void *file_private_data; | |
77 | } snd_info_private_data_t; | |
78 | ||
79 | static int snd_info_version_init(void); | |
80 | static int snd_info_version_done(void); | |
81 | ||
82 | ||
83 | /** | |
84 | * snd_iprintf - printf on the procfs buffer | |
85 | * @buffer: the procfs buffer | |
86 | * @fmt: the printf format | |
87 | * | |
88 | * Outputs the string on the procfs buffer just like printf(). | |
89 | * | |
90 | * Returns the size of output string. | |
91 | */ | |
92 | int snd_iprintf(snd_info_buffer_t * buffer, char *fmt,...) | |
93 | { | |
94 | va_list args; | |
95 | int len, res; | |
96 | ||
97 | if (buffer->stop || buffer->error) | |
98 | return 0; | |
99 | len = buffer->len - buffer->size; | |
100 | va_start(args, fmt); | |
101 | res = vsnprintf(buffer->curr, len, fmt, args); | |
102 | va_end(args); | |
103 | if (res >= len) { | |
104 | buffer->stop = 1; | |
105 | return 0; | |
106 | } | |
107 | buffer->curr += res; | |
108 | buffer->size += res; | |
109 | return res; | |
110 | } | |
111 | ||
112 | /* | |
113 | ||
114 | */ | |
115 | ||
116 | static struct proc_dir_entry *snd_proc_root = NULL; | |
117 | snd_info_entry_t *snd_seq_root = NULL; | |
118 | #ifdef CONFIG_SND_OSSEMUL | |
119 | snd_info_entry_t *snd_oss_root = NULL; | |
120 | #endif | |
121 | ||
122 | static inline void snd_info_entry_prepare(struct proc_dir_entry *de) | |
123 | { | |
124 | de->owner = THIS_MODULE; | |
125 | } | |
126 | ||
127 | static void snd_remove_proc_entry(struct proc_dir_entry *parent, | |
128 | struct proc_dir_entry *de) | |
129 | { | |
130 | if (de) | |
131 | remove_proc_entry(de->name, parent); | |
132 | } | |
133 | ||
134 | static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig) | |
135 | { | |
136 | snd_info_private_data_t *data; | |
137 | struct snd_info_entry *entry; | |
138 | loff_t ret; | |
139 | ||
140 | data = file->private_data; | |
141 | entry = data->entry; | |
142 | lock_kernel(); | |
143 | switch (entry->content) { | |
144 | case SNDRV_INFO_CONTENT_TEXT: | |
145 | switch (orig) { | |
146 | case 0: /* SEEK_SET */ | |
147 | file->f_pos = offset; | |
148 | ret = file->f_pos; | |
149 | goto out; | |
150 | case 1: /* SEEK_CUR */ | |
151 | file->f_pos += offset; | |
152 | ret = file->f_pos; | |
153 | goto out; | |
154 | case 2: /* SEEK_END */ | |
155 | default: | |
156 | ret = -EINVAL; | |
157 | goto out; | |
158 | } | |
159 | break; | |
160 | case SNDRV_INFO_CONTENT_DATA: | |
161 | if (entry->c.ops->llseek) { | |
162 | ret = entry->c.ops->llseek(entry, | |
163 | data->file_private_data, | |
164 | file, offset, orig); | |
165 | goto out; | |
166 | } | |
167 | break; | |
168 | } | |
169 | ret = -ENXIO; | |
170 | out: | |
171 | unlock_kernel(); | |
172 | return ret; | |
173 | } | |
174 | ||
175 | static ssize_t snd_info_entry_read(struct file *file, char __user *buffer, | |
176 | size_t count, loff_t * offset) | |
177 | { | |
178 | snd_info_private_data_t *data; | |
179 | struct snd_info_entry *entry; | |
180 | snd_info_buffer_t *buf; | |
181 | size_t size = 0; | |
182 | loff_t pos; | |
183 | ||
184 | data = file->private_data; | |
185 | snd_assert(data != NULL, return -ENXIO); | |
186 | pos = *offset; | |
187 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
188 | return -EIO; | |
189 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
190 | return -EIO; | |
191 | entry = data->entry; | |
192 | switch (entry->content) { | |
193 | case SNDRV_INFO_CONTENT_TEXT: | |
194 | buf = data->rbuffer; | |
195 | if (buf == NULL) | |
196 | return -EIO; | |
197 | if (pos >= buf->size) | |
198 | return 0; | |
199 | size = buf->size - pos; | |
200 | size = min(count, size); | |
201 | if (copy_to_user(buffer, buf->buffer + pos, size)) | |
202 | return -EFAULT; | |
203 | break; | |
204 | case SNDRV_INFO_CONTENT_DATA: | |
205 | if (entry->c.ops->read) | |
206 | size = entry->c.ops->read(entry, | |
207 | data->file_private_data, | |
208 | file, buffer, count, pos); | |
209 | break; | |
210 | } | |
211 | if ((ssize_t) size > 0) | |
212 | *offset = pos + size; | |
213 | return size; | |
214 | } | |
215 | ||
216 | static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer, | |
217 | size_t count, loff_t * offset) | |
218 | { | |
219 | snd_info_private_data_t *data; | |
220 | struct snd_info_entry *entry; | |
221 | snd_info_buffer_t *buf; | |
222 | size_t size = 0; | |
223 | loff_t pos; | |
224 | ||
225 | data = file->private_data; | |
226 | snd_assert(data != NULL, return -ENXIO); | |
227 | entry = data->entry; | |
228 | pos = *offset; | |
229 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
230 | return -EIO; | |
231 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
232 | return -EIO; | |
233 | switch (entry->content) { | |
234 | case SNDRV_INFO_CONTENT_TEXT: | |
235 | buf = data->wbuffer; | |
236 | if (buf == NULL) | |
237 | return -EIO; | |
238 | if (pos >= buf->len) | |
239 | return -ENOMEM; | |
240 | size = buf->len - pos; | |
241 | size = min(count, size); | |
242 | if (copy_from_user(buf->buffer + pos, buffer, size)) | |
243 | return -EFAULT; | |
244 | if ((long)buf->size < pos + size) | |
245 | buf->size = pos + size; | |
246 | break; | |
247 | case SNDRV_INFO_CONTENT_DATA: | |
248 | if (entry->c.ops->write) | |
249 | size = entry->c.ops->write(entry, | |
250 | data->file_private_data, | |
251 | file, buffer, count, pos); | |
252 | break; | |
253 | } | |
254 | if ((ssize_t) size > 0) | |
255 | *offset = pos + size; | |
256 | return size; | |
257 | } | |
258 | ||
259 | static int snd_info_entry_open(struct inode *inode, struct file *file) | |
260 | { | |
261 | snd_info_entry_t *entry; | |
262 | snd_info_private_data_t *data; | |
263 | snd_info_buffer_t *buffer; | |
264 | struct proc_dir_entry *p; | |
265 | int mode, err; | |
266 | ||
267 | down(&info_mutex); | |
268 | p = PDE(inode); | |
269 | entry = p == NULL ? NULL : (snd_info_entry_t *)p->data; | |
270 | if (entry == NULL || entry->disconnected) { | |
271 | up(&info_mutex); | |
272 | return -ENODEV; | |
273 | } | |
274 | if (!try_module_get(entry->module)) { | |
275 | err = -EFAULT; | |
276 | goto __error1; | |
277 | } | |
278 | mode = file->f_flags & O_ACCMODE; | |
279 | if (mode == O_RDONLY || mode == O_RDWR) { | |
280 | if ((entry->content == SNDRV_INFO_CONTENT_TEXT && | |
281 | !entry->c.text.read_size) || | |
282 | (entry->content == SNDRV_INFO_CONTENT_DATA && | |
283 | entry->c.ops->read == NULL)) { | |
284 | err = -ENODEV; | |
285 | goto __error; | |
286 | } | |
287 | } | |
288 | if (mode == O_WRONLY || mode == O_RDWR) { | |
289 | if ((entry->content == SNDRV_INFO_CONTENT_TEXT && | |
290 | !entry->c.text.write_size) || | |
291 | (entry->content == SNDRV_INFO_CONTENT_DATA && | |
292 | entry->c.ops->write == NULL)) { | |
293 | err = -ENODEV; | |
294 | goto __error; | |
295 | } | |
296 | } | |
297 | data = kcalloc(1, sizeof(*data), GFP_KERNEL); | |
298 | if (data == NULL) { | |
299 | err = -ENOMEM; | |
300 | goto __error; | |
301 | } | |
302 | data->entry = entry; | |
303 | switch (entry->content) { | |
304 | case SNDRV_INFO_CONTENT_TEXT: | |
305 | if (mode == O_RDONLY || mode == O_RDWR) { | |
306 | buffer = kcalloc(1, sizeof(*buffer), GFP_KERNEL); | |
307 | if (buffer == NULL) { | |
308 | kfree(data); | |
309 | err = -ENOMEM; | |
310 | goto __error; | |
311 | } | |
312 | buffer->len = (entry->c.text.read_size + | |
313 | (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1); | |
314 | buffer->buffer = vmalloc(buffer->len); | |
315 | if (buffer->buffer == NULL) { | |
316 | kfree(buffer); | |
317 | kfree(data); | |
318 | err = -ENOMEM; | |
319 | goto __error; | |
320 | } | |
321 | buffer->curr = buffer->buffer; | |
322 | data->rbuffer = buffer; | |
323 | } | |
324 | if (mode == O_WRONLY || mode == O_RDWR) { | |
325 | buffer = kcalloc(1, sizeof(*buffer), GFP_KERNEL); | |
326 | if (buffer == NULL) { | |
327 | if (mode == O_RDWR) { | |
328 | vfree(data->rbuffer->buffer); | |
329 | kfree(data->rbuffer); | |
330 | } | |
331 | kfree(data); | |
332 | err = -ENOMEM; | |
333 | goto __error; | |
334 | } | |
335 | buffer->len = (entry->c.text.write_size + | |
336 | (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1); | |
337 | buffer->buffer = vmalloc(buffer->len); | |
338 | if (buffer->buffer == NULL) { | |
339 | if (mode == O_RDWR) { | |
340 | vfree(data->rbuffer->buffer); | |
341 | kfree(data->rbuffer); | |
342 | } | |
343 | kfree(buffer); | |
344 | kfree(data); | |
345 | err = -ENOMEM; | |
346 | goto __error; | |
347 | } | |
348 | buffer->curr = buffer->buffer; | |
349 | data->wbuffer = buffer; | |
350 | } | |
351 | break; | |
352 | case SNDRV_INFO_CONTENT_DATA: /* data */ | |
353 | if (entry->c.ops->open) { | |
354 | if ((err = entry->c.ops->open(entry, mode, | |
355 | &data->file_private_data)) < 0) { | |
356 | kfree(data); | |
357 | goto __error; | |
358 | } | |
359 | } | |
360 | break; | |
361 | } | |
362 | file->private_data = data; | |
363 | up(&info_mutex); | |
364 | if (entry->content == SNDRV_INFO_CONTENT_TEXT && | |
365 | (mode == O_RDONLY || mode == O_RDWR)) { | |
366 | if (entry->c.text.read) { | |
367 | down(&entry->access); | |
368 | entry->c.text.read(entry, data->rbuffer); | |
369 | up(&entry->access); | |
370 | } | |
371 | } | |
372 | return 0; | |
373 | ||
374 | __error: | |
375 | module_put(entry->module); | |
376 | __error1: | |
377 | up(&info_mutex); | |
378 | return err; | |
379 | } | |
380 | ||
381 | static int snd_info_entry_release(struct inode *inode, struct file *file) | |
382 | { | |
383 | snd_info_entry_t *entry; | |
384 | snd_info_private_data_t *data; | |
385 | int mode; | |
386 | ||
387 | mode = file->f_flags & O_ACCMODE; | |
388 | data = file->private_data; | |
389 | entry = data->entry; | |
390 | switch (entry->content) { | |
391 | case SNDRV_INFO_CONTENT_TEXT: | |
392 | if (mode == O_RDONLY || mode == O_RDWR) { | |
393 | vfree(data->rbuffer->buffer); | |
394 | kfree(data->rbuffer); | |
395 | } | |
396 | if (mode == O_WRONLY || mode == O_RDWR) { | |
397 | if (entry->c.text.write) { | |
398 | entry->c.text.write(entry, data->wbuffer); | |
399 | if (data->wbuffer->error) { | |
400 | snd_printk(KERN_WARNING "data write error to %s (%i)\n", | |
401 | entry->name, | |
402 | data->wbuffer->error); | |
403 | } | |
404 | } | |
405 | vfree(data->wbuffer->buffer); | |
406 | kfree(data->wbuffer); | |
407 | } | |
408 | break; | |
409 | case SNDRV_INFO_CONTENT_DATA: | |
410 | if (entry->c.ops->release) | |
411 | entry->c.ops->release(entry, mode, | |
412 | data->file_private_data); | |
413 | break; | |
414 | } | |
415 | module_put(entry->module); | |
416 | kfree(data); | |
417 | return 0; | |
418 | } | |
419 | ||
420 | static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait) | |
421 | { | |
422 | snd_info_private_data_t *data; | |
423 | struct snd_info_entry *entry; | |
424 | unsigned int mask; | |
425 | ||
426 | data = file->private_data; | |
427 | if (data == NULL) | |
428 | return 0; | |
429 | entry = data->entry; | |
430 | mask = 0; | |
431 | switch (entry->content) { | |
432 | case SNDRV_INFO_CONTENT_DATA: | |
433 | if (entry->c.ops->poll) | |
434 | return entry->c.ops->poll(entry, | |
435 | data->file_private_data, | |
436 | file, wait); | |
437 | if (entry->c.ops->read) | |
438 | mask |= POLLIN | POLLRDNORM; | |
439 | if (entry->c.ops->write) | |
440 | mask |= POLLOUT | POLLWRNORM; | |
441 | break; | |
442 | } | |
443 | return mask; | |
444 | } | |
445 | ||
446 | static inline int _snd_info_entry_ioctl(struct inode *inode, struct file *file, | |
447 | unsigned int cmd, unsigned long arg) | |
448 | { | |
449 | snd_info_private_data_t *data; | |
450 | struct snd_info_entry *entry; | |
451 | ||
452 | data = file->private_data; | |
453 | if (data == NULL) | |
454 | return 0; | |
455 | entry = data->entry; | |
456 | switch (entry->content) { | |
457 | case SNDRV_INFO_CONTENT_DATA: | |
458 | if (entry->c.ops->ioctl) | |
459 | return entry->c.ops->ioctl(entry, | |
460 | data->file_private_data, | |
461 | file, cmd, arg); | |
462 | break; | |
463 | } | |
464 | return -ENOTTY; | |
465 | } | |
466 | ||
467 | /* FIXME: need to unlock BKL to allow preemption */ | |
468 | static int snd_info_entry_ioctl(struct inode *inode, struct file *file, | |
469 | unsigned int cmd, unsigned long arg) | |
470 | { | |
471 | int err; | |
472 | unlock_kernel(); | |
473 | err = _snd_info_entry_ioctl(inode, file, cmd, arg); | |
474 | lock_kernel(); | |
475 | return err; | |
476 | } | |
477 | ||
478 | static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma) | |
479 | { | |
480 | struct inode *inode = file->f_dentry->d_inode; | |
481 | snd_info_private_data_t *data; | |
482 | struct snd_info_entry *entry; | |
483 | ||
484 | data = file->private_data; | |
485 | if (data == NULL) | |
486 | return 0; | |
487 | entry = data->entry; | |
488 | switch (entry->content) { | |
489 | case SNDRV_INFO_CONTENT_DATA: | |
490 | if (entry->c.ops->mmap) | |
491 | return entry->c.ops->mmap(entry, | |
492 | data->file_private_data, | |
493 | inode, file, vma); | |
494 | break; | |
495 | } | |
496 | return -ENXIO; | |
497 | } | |
498 | ||
499 | static struct file_operations snd_info_entry_operations = | |
500 | { | |
501 | .owner = THIS_MODULE, | |
502 | .llseek = snd_info_entry_llseek, | |
503 | .read = snd_info_entry_read, | |
504 | .write = snd_info_entry_write, | |
505 | .poll = snd_info_entry_poll, | |
506 | .ioctl = snd_info_entry_ioctl, | |
507 | .mmap = snd_info_entry_mmap, | |
508 | .open = snd_info_entry_open, | |
509 | .release = snd_info_entry_release, | |
510 | }; | |
511 | ||
512 | /** | |
513 | * snd_create_proc_entry - create a procfs entry | |
514 | * @name: the name of the proc file | |
515 | * @mode: the file permission bits, S_Ixxx | |
516 | * @parent: the parent proc-directory entry | |
517 | * | |
518 | * Creates a new proc file entry with the given name and permission | |
519 | * on the given directory. | |
520 | * | |
521 | * Returns the pointer of new instance or NULL on failure. | |
522 | */ | |
523 | static struct proc_dir_entry *snd_create_proc_entry(const char *name, mode_t mode, | |
524 | struct proc_dir_entry *parent) | |
525 | { | |
526 | struct proc_dir_entry *p; | |
527 | p = create_proc_entry(name, mode, parent); | |
528 | if (p) | |
529 | snd_info_entry_prepare(p); | |
530 | return p; | |
531 | } | |
532 | ||
533 | int __init snd_info_init(void) | |
534 | { | |
535 | struct proc_dir_entry *p; | |
536 | ||
537 | p = snd_create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, &proc_root); | |
538 | if (p == NULL) | |
539 | return -ENOMEM; | |
540 | snd_proc_root = p; | |
541 | #ifdef CONFIG_SND_OSSEMUL | |
542 | { | |
543 | snd_info_entry_t *entry; | |
544 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL) | |
545 | return -ENOMEM; | |
546 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
547 | if (snd_info_register(entry) < 0) { | |
548 | snd_info_free_entry(entry); | |
549 | return -ENOMEM; | |
550 | } | |
551 | snd_oss_root = entry; | |
552 | } | |
553 | #endif | |
554 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
555 | { | |
556 | snd_info_entry_t *entry; | |
557 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL) | |
558 | return -ENOMEM; | |
559 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
560 | if (snd_info_register(entry) < 0) { | |
561 | snd_info_free_entry(entry); | |
562 | return -ENOMEM; | |
563 | } | |
564 | snd_seq_root = entry; | |
565 | } | |
566 | #endif | |
567 | snd_info_version_init(); | |
568 | snd_memory_info_init(); | |
569 | snd_minor_info_init(); | |
570 | snd_minor_info_oss_init(); | |
571 | snd_card_info_init(); | |
572 | return 0; | |
573 | } | |
574 | ||
575 | int __exit snd_info_done(void) | |
576 | { | |
577 | snd_card_info_done(); | |
578 | snd_minor_info_oss_done(); | |
579 | snd_minor_info_done(); | |
580 | snd_memory_info_done(); | |
581 | snd_info_version_done(); | |
582 | if (snd_proc_root) { | |
583 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
584 | if (snd_seq_root) | |
585 | snd_info_unregister(snd_seq_root); | |
586 | #endif | |
587 | #ifdef CONFIG_SND_OSSEMUL | |
588 | if (snd_oss_root) | |
589 | snd_info_unregister(snd_oss_root); | |
590 | #endif | |
591 | snd_remove_proc_entry(&proc_root, snd_proc_root); | |
592 | } | |
593 | return 0; | |
594 | } | |
595 | ||
596 | /* | |
597 | ||
598 | */ | |
599 | ||
600 | ||
601 | /* | |
602 | * create a card proc file | |
603 | * called from init.c | |
604 | */ | |
605 | int snd_info_card_create(snd_card_t * card) | |
606 | { | |
607 | char str[8]; | |
608 | snd_info_entry_t *entry; | |
609 | ||
610 | snd_assert(card != NULL, return -ENXIO); | |
611 | ||
612 | sprintf(str, "card%i", card->number); | |
613 | if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL) | |
614 | return -ENOMEM; | |
615 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
616 | if (snd_info_register(entry) < 0) { | |
617 | snd_info_free_entry(entry); | |
618 | return -ENOMEM; | |
619 | } | |
620 | card->proc_root = entry; | |
621 | return 0; | |
622 | } | |
623 | ||
624 | /* | |
625 | * register the card proc file | |
626 | * called from init.c | |
627 | */ | |
628 | int snd_info_card_register(snd_card_t * card) | |
629 | { | |
630 | struct proc_dir_entry *p; | |
631 | ||
632 | snd_assert(card != NULL, return -ENXIO); | |
633 | ||
634 | if (!strcmp(card->id, card->proc_root->name)) | |
635 | return 0; | |
636 | ||
637 | p = proc_symlink(card->id, snd_proc_root, card->proc_root->name); | |
638 | if (p == NULL) | |
639 | return -ENOMEM; | |
640 | card->proc_root_link = p; | |
641 | return 0; | |
642 | } | |
643 | ||
644 | /* | |
645 | * de-register the card proc file | |
646 | * called from init.c | |
647 | */ | |
648 | int snd_info_card_free(snd_card_t * card) | |
649 | { | |
650 | snd_assert(card != NULL, return -ENXIO); | |
651 | if (card->proc_root_link) { | |
652 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); | |
653 | card->proc_root_link = NULL; | |
654 | } | |
655 | if (card->proc_root) { | |
656 | snd_info_unregister(card->proc_root); | |
657 | card->proc_root = NULL; | |
658 | } | |
659 | return 0; | |
660 | } | |
661 | ||
662 | ||
663 | /** | |
664 | * snd_info_get_line - read one line from the procfs buffer | |
665 | * @buffer: the procfs buffer | |
666 | * @line: the buffer to store | |
667 | * @len: the max. buffer size - 1 | |
668 | * | |
669 | * Reads one line from the buffer and stores the string. | |
670 | * | |
671 | * Returns zero if successful, or 1 if error or EOF. | |
672 | */ | |
673 | int snd_info_get_line(snd_info_buffer_t * buffer, char *line, int len) | |
674 | { | |
675 | int c = -1; | |
676 | ||
677 | if (len <= 0 || buffer->stop || buffer->error) | |
678 | return 1; | |
679 | while (--len > 0) { | |
680 | c = *buffer->curr++; | |
681 | if (c == '\n') { | |
682 | if ((buffer->curr - buffer->buffer) >= (long)buffer->size) { | |
683 | buffer->stop = 1; | |
684 | } | |
685 | break; | |
686 | } | |
687 | *line++ = c; | |
688 | if ((buffer->curr - buffer->buffer) >= (long)buffer->size) { | |
689 | buffer->stop = 1; | |
690 | break; | |
691 | } | |
692 | } | |
693 | while (c != '\n' && !buffer->stop) { | |
694 | c = *buffer->curr++; | |
695 | if ((buffer->curr - buffer->buffer) >= (long)buffer->size) { | |
696 | buffer->stop = 1; | |
697 | } | |
698 | } | |
699 | *line = '\0'; | |
700 | return 0; | |
701 | } | |
702 | ||
703 | /** | |
704 | * snd_info_get_line - parse a string token | |
705 | * @dest: the buffer to store the string token | |
706 | * @src: the original string | |
707 | * @len: the max. length of token - 1 | |
708 | * | |
709 | * Parses the original string and copy a token to the given | |
710 | * string buffer. | |
711 | * | |
712 | * Returns the updated pointer of the original string so that | |
713 | * it can be used for the next call. | |
714 | */ | |
715 | char *snd_info_get_str(char *dest, char *src, int len) | |
716 | { | |
717 | int c; | |
718 | ||
719 | while (*src == ' ' || *src == '\t') | |
720 | src++; | |
721 | if (*src == '"' || *src == '\'') { | |
722 | c = *src++; | |
723 | while (--len > 0 && *src && *src != c) { | |
724 | *dest++ = *src++; | |
725 | } | |
726 | if (*src == c) | |
727 | src++; | |
728 | } else { | |
729 | while (--len > 0 && *src && *src != ' ' && *src != '\t') { | |
730 | *dest++ = *src++; | |
731 | } | |
732 | } | |
733 | *dest = 0; | |
734 | while (*src == ' ' || *src == '\t') | |
735 | src++; | |
736 | return src; | |
737 | } | |
738 | ||
739 | /** | |
740 | * snd_info_create_entry - create an info entry | |
741 | * @name: the proc file name | |
742 | * | |
743 | * Creates an info entry with the given file name and initializes as | |
744 | * the default state. | |
745 | * | |
746 | * Usually called from other functions such as | |
747 | * snd_info_create_card_entry(). | |
748 | * | |
749 | * Returns the pointer of the new instance, or NULL on failure. | |
750 | */ | |
751 | static snd_info_entry_t *snd_info_create_entry(const char *name) | |
752 | { | |
753 | snd_info_entry_t *entry; | |
754 | entry = kcalloc(1, sizeof(*entry), GFP_KERNEL); | |
755 | if (entry == NULL) | |
756 | return NULL; | |
757 | entry->name = snd_kmalloc_strdup(name, GFP_KERNEL); | |
758 | if (entry->name == NULL) { | |
759 | kfree(entry); | |
760 | return NULL; | |
761 | } | |
762 | entry->mode = S_IFREG | S_IRUGO; | |
763 | entry->content = SNDRV_INFO_CONTENT_TEXT; | |
764 | init_MUTEX(&entry->access); | |
765 | return entry; | |
766 | } | |
767 | ||
768 | /** | |
769 | * snd_info_create_module_entry - create an info entry for the given module | |
770 | * @module: the module pointer | |
771 | * @name: the file name | |
772 | * @parent: the parent directory | |
773 | * | |
774 | * Creates a new info entry and assigns it to the given module. | |
775 | * | |
776 | * Returns the pointer of the new instance, or NULL on failure. | |
777 | */ | |
778 | snd_info_entry_t *snd_info_create_module_entry(struct module * module, | |
779 | const char *name, | |
780 | snd_info_entry_t *parent) | |
781 | { | |
782 | snd_info_entry_t *entry = snd_info_create_entry(name); | |
783 | if (entry) { | |
784 | entry->module = module; | |
785 | entry->parent = parent; | |
786 | } | |
787 | return entry; | |
788 | } | |
789 | ||
790 | /** | |
791 | * snd_info_create_card_entry - create an info entry for the given card | |
792 | * @card: the card instance | |
793 | * @name: the file name | |
794 | * @parent: the parent directory | |
795 | * | |
796 | * Creates a new info entry and assigns it to the given card. | |
797 | * | |
798 | * Returns the pointer of the new instance, or NULL on failure. | |
799 | */ | |
800 | snd_info_entry_t *snd_info_create_card_entry(snd_card_t * card, | |
801 | const char *name, | |
802 | snd_info_entry_t * parent) | |
803 | { | |
804 | snd_info_entry_t *entry = snd_info_create_entry(name); | |
805 | if (entry) { | |
806 | entry->module = card->module; | |
807 | entry->card = card; | |
808 | entry->parent = parent; | |
809 | } | |
810 | return entry; | |
811 | } | |
812 | ||
813 | static int snd_info_dev_free_entry(snd_device_t *device) | |
814 | { | |
815 | snd_info_entry_t *entry = device->device_data; | |
816 | snd_info_free_entry(entry); | |
817 | return 0; | |
818 | } | |
819 | ||
820 | static int snd_info_dev_register_entry(snd_device_t *device) | |
821 | { | |
822 | snd_info_entry_t *entry = device->device_data; | |
823 | return snd_info_register(entry); | |
824 | } | |
825 | ||
826 | static int snd_info_dev_disconnect_entry(snd_device_t *device) | |
827 | { | |
828 | snd_info_entry_t *entry = device->device_data; | |
829 | entry->disconnected = 1; | |
830 | return 0; | |
831 | } | |
832 | ||
833 | static int snd_info_dev_unregister_entry(snd_device_t *device) | |
834 | { | |
835 | snd_info_entry_t *entry = device->device_data; | |
836 | return snd_info_unregister(entry); | |
837 | } | |
838 | ||
839 | /** | |
840 | * snd_card_proc_new - create an info entry for the given card | |
841 | * @card: the card instance | |
842 | * @name: the file name | |
843 | * @entryp: the pointer to store the new info entry | |
844 | * | |
845 | * Creates a new info entry and assigns it to the given card. | |
846 | * Unlike snd_info_create_card_entry(), this function registers the | |
847 | * info entry as an ALSA device component, so that it can be | |
848 | * unregistered/released without explicit call. | |
849 | * Also, you don't have to register this entry via snd_info_register(), | |
850 | * since this will be registered by snd_card_register() automatically. | |
851 | * | |
852 | * The parent is assumed as card->proc_root. | |
853 | * | |
854 | * For releasing this entry, use snd_device_free() instead of | |
855 | * snd_info_free_entry(). | |
856 | * | |
857 | * Returns zero if successful, or a negative error code on failure. | |
858 | */ | |
859 | int snd_card_proc_new(snd_card_t *card, const char *name, | |
860 | snd_info_entry_t **entryp) | |
861 | { | |
862 | static snd_device_ops_t ops = { | |
863 | .dev_free = snd_info_dev_free_entry, | |
864 | .dev_register = snd_info_dev_register_entry, | |
865 | .dev_disconnect = snd_info_dev_disconnect_entry, | |
866 | .dev_unregister = snd_info_dev_unregister_entry | |
867 | }; | |
868 | snd_info_entry_t *entry; | |
869 | int err; | |
870 | ||
871 | entry = snd_info_create_card_entry(card, name, card->proc_root); | |
872 | if (! entry) | |
873 | return -ENOMEM; | |
874 | if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) { | |
875 | snd_info_free_entry(entry); | |
876 | return err; | |
877 | } | |
878 | if (entryp) | |
879 | *entryp = entry; | |
880 | return 0; | |
881 | } | |
882 | ||
883 | /** | |
884 | * snd_info_free_entry - release the info entry | |
885 | * @entry: the info entry | |
886 | * | |
887 | * Releases the info entry. Don't call this after registered. | |
888 | */ | |
889 | void snd_info_free_entry(snd_info_entry_t * entry) | |
890 | { | |
891 | if (entry == NULL) | |
892 | return; | |
893 | kfree(entry->name); | |
894 | if (entry->private_free) | |
895 | entry->private_free(entry); | |
896 | kfree(entry); | |
897 | } | |
898 | ||
899 | /** | |
900 | * snd_info_register - register the info entry | |
901 | * @entry: the info entry | |
902 | * | |
903 | * Registers the proc info entry. | |
904 | * | |
905 | * Returns zero if successful, or a negative error code on failure. | |
906 | */ | |
907 | int snd_info_register(snd_info_entry_t * entry) | |
908 | { | |
909 | struct proc_dir_entry *root, *p = NULL; | |
910 | ||
911 | snd_assert(entry != NULL, return -ENXIO); | |
912 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; | |
913 | down(&info_mutex); | |
914 | p = snd_create_proc_entry(entry->name, entry->mode, root); | |
915 | if (!p) { | |
916 | up(&info_mutex); | |
917 | return -ENOMEM; | |
918 | } | |
919 | p->owner = entry->module; | |
920 | if (!S_ISDIR(entry->mode)) | |
921 | p->proc_fops = &snd_info_entry_operations; | |
922 | p->size = entry->size; | |
923 | p->data = entry; | |
924 | entry->p = p; | |
925 | up(&info_mutex); | |
926 | return 0; | |
927 | } | |
928 | ||
929 | /** | |
930 | * snd_info_unregister - de-register the info entry | |
931 | * @entry: the info entry | |
932 | * | |
933 | * De-registers the info entry and releases the instance. | |
934 | * | |
935 | * Returns zero if successful, or a negative error code on failure. | |
936 | */ | |
937 | int snd_info_unregister(snd_info_entry_t * entry) | |
938 | { | |
939 | struct proc_dir_entry *root; | |
940 | ||
941 | snd_assert(entry != NULL && entry->p != NULL, return -ENXIO); | |
942 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; | |
943 | snd_assert(root, return -ENXIO); | |
944 | down(&info_mutex); | |
945 | snd_remove_proc_entry(root, entry->p); | |
946 | up(&info_mutex); | |
947 | snd_info_free_entry(entry); | |
948 | return 0; | |
949 | } | |
950 | ||
951 | /* | |
952 | ||
953 | */ | |
954 | ||
955 | static snd_info_entry_t *snd_info_version_entry = NULL; | |
956 | ||
957 | static void snd_info_version_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) | |
958 | { | |
959 | snd_iprintf(buffer, | |
960 | "Advanced Linux Sound Architecture Driver Version " | |
961 | CONFIG_SND_VERSION CONFIG_SND_DATE ".\n" | |
962 | ); | |
963 | } | |
964 | ||
965 | static int __init snd_info_version_init(void) | |
966 | { | |
967 | snd_info_entry_t *entry; | |
968 | ||
969 | entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL); | |
970 | if (entry == NULL) | |
971 | return -ENOMEM; | |
972 | entry->c.text.read_size = 256; | |
973 | entry->c.text.read = snd_info_version_read; | |
974 | if (snd_info_register(entry) < 0) { | |
975 | snd_info_free_entry(entry); | |
976 | return -ENOMEM; | |
977 | } | |
978 | snd_info_version_entry = entry; | |
979 | return 0; | |
980 | } | |
981 | ||
982 | static int __exit snd_info_version_done(void) | |
983 | { | |
984 | if (snd_info_version_entry) | |
985 | snd_info_unregister(snd_info_version_entry); | |
986 | return 0; | |
987 | } | |
988 | ||
989 | #endif /* CONFIG_PROC_FS */ |