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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> | |
543537bd | 27 | #include <linux/string.h> |
1da177e4 LT |
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/devfs_fs_kernel.h> | |
34 | #include <stdarg.h> | |
35 | ||
36 | /* | |
37 | * | |
38 | */ | |
39 | ||
40 | int snd_info_check_reserved_words(const char *str) | |
41 | { | |
42 | static char *reserved[] = | |
43 | { | |
44 | "version", | |
45 | "meminfo", | |
46 | "memdebug", | |
47 | "detect", | |
48 | "devices", | |
49 | "oss", | |
50 | "cards", | |
51 | "timers", | |
52 | "synth", | |
53 | "pcm", | |
54 | "seq", | |
55 | NULL | |
56 | }; | |
57 | char **xstr = reserved; | |
58 | ||
59 | while (*xstr) { | |
60 | if (!strcmp(*xstr, str)) | |
61 | return 0; | |
62 | xstr++; | |
63 | } | |
64 | if (!strncmp(str, "card", 4)) | |
65 | return 0; | |
66 | return 1; | |
67 | } | |
68 | ||
69 | #ifdef CONFIG_PROC_FS | |
70 | ||
71 | static DECLARE_MUTEX(info_mutex); | |
72 | ||
73 | typedef struct _snd_info_private_data { | |
74 | snd_info_buffer_t *rbuffer; | |
75 | snd_info_buffer_t *wbuffer; | |
76 | snd_info_entry_t *entry; | |
77 | void *file_private_data; | |
78 | } snd_info_private_data_t; | |
79 | ||
80 | static int snd_info_version_init(void); | |
81 | static int snd_info_version_done(void); | |
82 | ||
83 | ||
84 | /** | |
85 | * snd_iprintf - printf on the procfs buffer | |
86 | * @buffer: the procfs buffer | |
87 | * @fmt: the printf format | |
88 | * | |
89 | * Outputs the string on the procfs buffer just like printf(). | |
90 | * | |
91 | * Returns the size of output string. | |
92 | */ | |
93 | int snd_iprintf(snd_info_buffer_t * buffer, char *fmt,...) | |
94 | { | |
95 | va_list args; | |
96 | int len, res; | |
97 | ||
98 | if (buffer->stop || buffer->error) | |
99 | return 0; | |
100 | len = buffer->len - buffer->size; | |
101 | va_start(args, fmt); | |
102 | res = vsnprintf(buffer->curr, len, fmt, args); | |
103 | va_end(args); | |
104 | if (res >= len) { | |
105 | buffer->stop = 1; | |
106 | return 0; | |
107 | } | |
108 | buffer->curr += res; | |
109 | buffer->size += res; | |
110 | return res; | |
111 | } | |
112 | ||
113 | /* | |
114 | ||
115 | */ | |
116 | ||
117 | static struct proc_dir_entry *snd_proc_root = NULL; | |
118 | snd_info_entry_t *snd_seq_root = NULL; | |
119 | #ifdef CONFIG_SND_OSSEMUL | |
120 | snd_info_entry_t *snd_oss_root = NULL; | |
121 | #endif | |
122 | ||
123 | static inline void snd_info_entry_prepare(struct proc_dir_entry *de) | |
124 | { | |
125 | de->owner = THIS_MODULE; | |
126 | } | |
127 | ||
128 | static void snd_remove_proc_entry(struct proc_dir_entry *parent, | |
129 | struct proc_dir_entry *de) | |
130 | { | |
131 | if (de) | |
132 | remove_proc_entry(de->name, parent); | |
133 | } | |
134 | ||
135 | static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig) | |
136 | { | |
137 | snd_info_private_data_t *data; | |
138 | struct snd_info_entry *entry; | |
139 | loff_t ret; | |
140 | ||
141 | data = file->private_data; | |
142 | entry = data->entry; | |
143 | lock_kernel(); | |
144 | switch (entry->content) { | |
145 | case SNDRV_INFO_CONTENT_TEXT: | |
146 | switch (orig) { | |
147 | case 0: /* SEEK_SET */ | |
148 | file->f_pos = offset; | |
149 | ret = file->f_pos; | |
150 | goto out; | |
151 | case 1: /* SEEK_CUR */ | |
152 | file->f_pos += offset; | |
153 | ret = file->f_pos; | |
154 | goto out; | |
155 | case 2: /* SEEK_END */ | |
156 | default: | |
157 | ret = -EINVAL; | |
158 | goto out; | |
159 | } | |
160 | break; | |
161 | case SNDRV_INFO_CONTENT_DATA: | |
162 | if (entry->c.ops->llseek) { | |
163 | ret = entry->c.ops->llseek(entry, | |
164 | data->file_private_data, | |
165 | file, offset, orig); | |
166 | goto out; | |
167 | } | |
168 | break; | |
169 | } | |
170 | ret = -ENXIO; | |
171 | out: | |
172 | unlock_kernel(); | |
173 | return ret; | |
174 | } | |
175 | ||
176 | static ssize_t snd_info_entry_read(struct file *file, char __user *buffer, | |
177 | size_t count, loff_t * offset) | |
178 | { | |
179 | snd_info_private_data_t *data; | |
180 | struct snd_info_entry *entry; | |
181 | snd_info_buffer_t *buf; | |
182 | size_t size = 0; | |
183 | loff_t pos; | |
184 | ||
185 | data = file->private_data; | |
186 | snd_assert(data != NULL, return -ENXIO); | |
187 | pos = *offset; | |
188 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
189 | return -EIO; | |
190 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
191 | return -EIO; | |
192 | entry = data->entry; | |
193 | switch (entry->content) { | |
194 | case SNDRV_INFO_CONTENT_TEXT: | |
195 | buf = data->rbuffer; | |
196 | if (buf == NULL) | |
197 | return -EIO; | |
198 | if (pos >= buf->size) | |
199 | return 0; | |
200 | size = buf->size - pos; | |
201 | size = min(count, size); | |
202 | if (copy_to_user(buffer, buf->buffer + pos, size)) | |
203 | return -EFAULT; | |
204 | break; | |
205 | case SNDRV_INFO_CONTENT_DATA: | |
206 | if (entry->c.ops->read) | |
207 | size = entry->c.ops->read(entry, | |
208 | data->file_private_data, | |
209 | file, buffer, count, pos); | |
210 | break; | |
211 | } | |
212 | if ((ssize_t) size > 0) | |
213 | *offset = pos + size; | |
214 | return size; | |
215 | } | |
216 | ||
217 | static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer, | |
218 | size_t count, loff_t * offset) | |
219 | { | |
220 | snd_info_private_data_t *data; | |
221 | struct snd_info_entry *entry; | |
222 | snd_info_buffer_t *buf; | |
223 | size_t size = 0; | |
224 | loff_t pos; | |
225 | ||
226 | data = file->private_data; | |
227 | snd_assert(data != NULL, return -ENXIO); | |
228 | entry = data->entry; | |
229 | pos = *offset; | |
230 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
231 | return -EIO; | |
232 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
233 | return -EIO; | |
234 | switch (entry->content) { | |
235 | case SNDRV_INFO_CONTENT_TEXT: | |
236 | buf = data->wbuffer; | |
237 | if (buf == NULL) | |
238 | return -EIO; | |
239 | if (pos >= buf->len) | |
240 | return -ENOMEM; | |
241 | size = buf->len - pos; | |
242 | size = min(count, size); | |
243 | if (copy_from_user(buf->buffer + pos, buffer, size)) | |
244 | return -EFAULT; | |
245 | if ((long)buf->size < pos + size) | |
246 | buf->size = pos + size; | |
247 | break; | |
248 | case SNDRV_INFO_CONTENT_DATA: | |
249 | if (entry->c.ops->write) | |
250 | size = entry->c.ops->write(entry, | |
251 | data->file_private_data, | |
252 | file, buffer, count, pos); | |
253 | break; | |
254 | } | |
255 | if ((ssize_t) size > 0) | |
256 | *offset = pos + size; | |
257 | return size; | |
258 | } | |
259 | ||
260 | static int snd_info_entry_open(struct inode *inode, struct file *file) | |
261 | { | |
262 | snd_info_entry_t *entry; | |
263 | snd_info_private_data_t *data; | |
264 | snd_info_buffer_t *buffer; | |
265 | struct proc_dir_entry *p; | |
266 | int mode, err; | |
267 | ||
268 | down(&info_mutex); | |
269 | p = PDE(inode); | |
270 | entry = p == NULL ? NULL : (snd_info_entry_t *)p->data; | |
271 | if (entry == NULL || entry->disconnected) { | |
272 | up(&info_mutex); | |
273 | return -ENODEV; | |
274 | } | |
275 | if (!try_module_get(entry->module)) { | |
276 | err = -EFAULT; | |
277 | goto __error1; | |
278 | } | |
279 | mode = file->f_flags & O_ACCMODE; | |
280 | if (mode == O_RDONLY || mode == O_RDWR) { | |
281 | if ((entry->content == SNDRV_INFO_CONTENT_TEXT && | |
282 | !entry->c.text.read_size) || | |
283 | (entry->content == SNDRV_INFO_CONTENT_DATA && | |
284 | entry->c.ops->read == NULL)) { | |
285 | err = -ENODEV; | |
286 | goto __error; | |
287 | } | |
288 | } | |
289 | if (mode == O_WRONLY || mode == O_RDWR) { | |
290 | if ((entry->content == SNDRV_INFO_CONTENT_TEXT && | |
291 | !entry->c.text.write_size) || | |
292 | (entry->content == SNDRV_INFO_CONTENT_DATA && | |
293 | entry->c.ops->write == NULL)) { | |
294 | err = -ENODEV; | |
295 | goto __error; | |
296 | } | |
297 | } | |
298 | data = kcalloc(1, sizeof(*data), GFP_KERNEL); | |
299 | if (data == NULL) { | |
300 | err = -ENOMEM; | |
301 | goto __error; | |
302 | } | |
303 | data->entry = entry; | |
304 | switch (entry->content) { | |
305 | case SNDRV_INFO_CONTENT_TEXT: | |
306 | if (mode == O_RDONLY || mode == O_RDWR) { | |
307 | buffer = kcalloc(1, sizeof(*buffer), GFP_KERNEL); | |
308 | if (buffer == NULL) { | |
309 | kfree(data); | |
310 | err = -ENOMEM; | |
311 | goto __error; | |
312 | } | |
313 | buffer->len = (entry->c.text.read_size + | |
314 | (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1); | |
315 | buffer->buffer = vmalloc(buffer->len); | |
316 | if (buffer->buffer == NULL) { | |
317 | kfree(buffer); | |
318 | kfree(data); | |
319 | err = -ENOMEM; | |
320 | goto __error; | |
321 | } | |
322 | buffer->curr = buffer->buffer; | |
323 | data->rbuffer = buffer; | |
324 | } | |
325 | if (mode == O_WRONLY || mode == O_RDWR) { | |
326 | buffer = kcalloc(1, sizeof(*buffer), GFP_KERNEL); | |
327 | if (buffer == NULL) { | |
328 | if (mode == O_RDWR) { | |
329 | vfree(data->rbuffer->buffer); | |
330 | kfree(data->rbuffer); | |
331 | } | |
332 | kfree(data); | |
333 | err = -ENOMEM; | |
334 | goto __error; | |
335 | } | |
336 | buffer->len = (entry->c.text.write_size + | |
337 | (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1); | |
338 | buffer->buffer = vmalloc(buffer->len); | |
339 | if (buffer->buffer == NULL) { | |
340 | if (mode == O_RDWR) { | |
341 | vfree(data->rbuffer->buffer); | |
342 | kfree(data->rbuffer); | |
343 | } | |
344 | kfree(buffer); | |
345 | kfree(data); | |
346 | err = -ENOMEM; | |
347 | goto __error; | |
348 | } | |
349 | buffer->curr = buffer->buffer; | |
350 | data->wbuffer = buffer; | |
351 | } | |
352 | break; | |
353 | case SNDRV_INFO_CONTENT_DATA: /* data */ | |
354 | if (entry->c.ops->open) { | |
355 | if ((err = entry->c.ops->open(entry, mode, | |
356 | &data->file_private_data)) < 0) { | |
357 | kfree(data); | |
358 | goto __error; | |
359 | } | |
360 | } | |
361 | break; | |
362 | } | |
363 | file->private_data = data; | |
364 | up(&info_mutex); | |
365 | if (entry->content == SNDRV_INFO_CONTENT_TEXT && | |
366 | (mode == O_RDONLY || mode == O_RDWR)) { | |
367 | if (entry->c.text.read) { | |
368 | down(&entry->access); | |
369 | entry->c.text.read(entry, data->rbuffer); | |
370 | up(&entry->access); | |
371 | } | |
372 | } | |
373 | return 0; | |
374 | ||
375 | __error: | |
376 | module_put(entry->module); | |
377 | __error1: | |
378 | up(&info_mutex); | |
379 | return err; | |
380 | } | |
381 | ||
382 | static int snd_info_entry_release(struct inode *inode, struct file *file) | |
383 | { | |
384 | snd_info_entry_t *entry; | |
385 | snd_info_private_data_t *data; | |
386 | int mode; | |
387 | ||
388 | mode = file->f_flags & O_ACCMODE; | |
389 | data = file->private_data; | |
390 | entry = data->entry; | |
391 | switch (entry->content) { | |
392 | case SNDRV_INFO_CONTENT_TEXT: | |
393 | if (mode == O_RDONLY || mode == O_RDWR) { | |
394 | vfree(data->rbuffer->buffer); | |
395 | kfree(data->rbuffer); | |
396 | } | |
397 | if (mode == O_WRONLY || mode == O_RDWR) { | |
398 | if (entry->c.text.write) { | |
399 | entry->c.text.write(entry, data->wbuffer); | |
400 | if (data->wbuffer->error) { | |
401 | snd_printk(KERN_WARNING "data write error to %s (%i)\n", | |
402 | entry->name, | |
403 | data->wbuffer->error); | |
404 | } | |
405 | } | |
406 | vfree(data->wbuffer->buffer); | |
407 | kfree(data->wbuffer); | |
408 | } | |
409 | break; | |
410 | case SNDRV_INFO_CONTENT_DATA: | |
411 | if (entry->c.ops->release) | |
412 | entry->c.ops->release(entry, mode, | |
413 | data->file_private_data); | |
414 | break; | |
415 | } | |
416 | module_put(entry->module); | |
417 | kfree(data); | |
418 | return 0; | |
419 | } | |
420 | ||
421 | static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait) | |
422 | { | |
423 | snd_info_private_data_t *data; | |
424 | struct snd_info_entry *entry; | |
425 | unsigned int mask; | |
426 | ||
427 | data = file->private_data; | |
428 | if (data == NULL) | |
429 | return 0; | |
430 | entry = data->entry; | |
431 | mask = 0; | |
432 | switch (entry->content) { | |
433 | case SNDRV_INFO_CONTENT_DATA: | |
434 | if (entry->c.ops->poll) | |
435 | return entry->c.ops->poll(entry, | |
436 | data->file_private_data, | |
437 | file, wait); | |
438 | if (entry->c.ops->read) | |
439 | mask |= POLLIN | POLLRDNORM; | |
440 | if (entry->c.ops->write) | |
441 | mask |= POLLOUT | POLLWRNORM; | |
442 | break; | |
443 | } | |
444 | return mask; | |
445 | } | |
446 | ||
447 | static inline int _snd_info_entry_ioctl(struct inode *inode, struct file *file, | |
448 | unsigned int cmd, unsigned long arg) | |
449 | { | |
450 | snd_info_private_data_t *data; | |
451 | struct snd_info_entry *entry; | |
452 | ||
453 | data = file->private_data; | |
454 | if (data == NULL) | |
455 | return 0; | |
456 | entry = data->entry; | |
457 | switch (entry->content) { | |
458 | case SNDRV_INFO_CONTENT_DATA: | |
459 | if (entry->c.ops->ioctl) | |
460 | return entry->c.ops->ioctl(entry, | |
461 | data->file_private_data, | |
462 | file, cmd, arg); | |
463 | break; | |
464 | } | |
465 | return -ENOTTY; | |
466 | } | |
467 | ||
468 | /* FIXME: need to unlock BKL to allow preemption */ | |
469 | static int snd_info_entry_ioctl(struct inode *inode, struct file *file, | |
470 | unsigned int cmd, unsigned long arg) | |
471 | { | |
472 | int err; | |
473 | unlock_kernel(); | |
474 | err = _snd_info_entry_ioctl(inode, file, cmd, arg); | |
475 | lock_kernel(); | |
476 | return err; | |
477 | } | |
478 | ||
479 | static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma) | |
480 | { | |
481 | struct inode *inode = file->f_dentry->d_inode; | |
482 | snd_info_private_data_t *data; | |
483 | struct snd_info_entry *entry; | |
484 | ||
485 | data = file->private_data; | |
486 | if (data == NULL) | |
487 | return 0; | |
488 | entry = data->entry; | |
489 | switch (entry->content) { | |
490 | case SNDRV_INFO_CONTENT_DATA: | |
491 | if (entry->c.ops->mmap) | |
492 | return entry->c.ops->mmap(entry, | |
493 | data->file_private_data, | |
494 | inode, file, vma); | |
495 | break; | |
496 | } | |
497 | return -ENXIO; | |
498 | } | |
499 | ||
500 | static struct file_operations snd_info_entry_operations = | |
501 | { | |
502 | .owner = THIS_MODULE, | |
503 | .llseek = snd_info_entry_llseek, | |
504 | .read = snd_info_entry_read, | |
505 | .write = snd_info_entry_write, | |
506 | .poll = snd_info_entry_poll, | |
507 | .ioctl = snd_info_entry_ioctl, | |
508 | .mmap = snd_info_entry_mmap, | |
509 | .open = snd_info_entry_open, | |
510 | .release = snd_info_entry_release, | |
511 | }; | |
512 | ||
513 | /** | |
514 | * snd_create_proc_entry - create a procfs entry | |
515 | * @name: the name of the proc file | |
516 | * @mode: the file permission bits, S_Ixxx | |
517 | * @parent: the parent proc-directory entry | |
518 | * | |
519 | * Creates a new proc file entry with the given name and permission | |
520 | * on the given directory. | |
521 | * | |
522 | * Returns the pointer of new instance or NULL on failure. | |
523 | */ | |
524 | static struct proc_dir_entry *snd_create_proc_entry(const char *name, mode_t mode, | |
525 | struct proc_dir_entry *parent) | |
526 | { | |
527 | struct proc_dir_entry *p; | |
528 | p = create_proc_entry(name, mode, parent); | |
529 | if (p) | |
530 | snd_info_entry_prepare(p); | |
531 | return p; | |
532 | } | |
533 | ||
534 | int __init snd_info_init(void) | |
535 | { | |
536 | struct proc_dir_entry *p; | |
537 | ||
538 | p = snd_create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, &proc_root); | |
539 | if (p == NULL) | |
540 | return -ENOMEM; | |
541 | snd_proc_root = p; | |
542 | #ifdef CONFIG_SND_OSSEMUL | |
543 | { | |
544 | snd_info_entry_t *entry; | |
545 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL) | |
546 | return -ENOMEM; | |
547 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
548 | if (snd_info_register(entry) < 0) { | |
549 | snd_info_free_entry(entry); | |
550 | return -ENOMEM; | |
551 | } | |
552 | snd_oss_root = entry; | |
553 | } | |
554 | #endif | |
555 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
556 | { | |
557 | snd_info_entry_t *entry; | |
558 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL) | |
559 | return -ENOMEM; | |
560 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
561 | if (snd_info_register(entry) < 0) { | |
562 | snd_info_free_entry(entry); | |
563 | return -ENOMEM; | |
564 | } | |
565 | snd_seq_root = entry; | |
566 | } | |
567 | #endif | |
568 | snd_info_version_init(); | |
569 | snd_memory_info_init(); | |
570 | snd_minor_info_init(); | |
571 | snd_minor_info_oss_init(); | |
572 | snd_card_info_init(); | |
573 | return 0; | |
574 | } | |
575 | ||
576 | int __exit snd_info_done(void) | |
577 | { | |
578 | snd_card_info_done(); | |
579 | snd_minor_info_oss_done(); | |
580 | snd_minor_info_done(); | |
581 | snd_memory_info_done(); | |
582 | snd_info_version_done(); | |
583 | if (snd_proc_root) { | |
584 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
585 | if (snd_seq_root) | |
586 | snd_info_unregister(snd_seq_root); | |
587 | #endif | |
588 | #ifdef CONFIG_SND_OSSEMUL | |
589 | if (snd_oss_root) | |
590 | snd_info_unregister(snd_oss_root); | |
591 | #endif | |
592 | snd_remove_proc_entry(&proc_root, snd_proc_root); | |
593 | } | |
594 | return 0; | |
595 | } | |
596 | ||
597 | /* | |
598 | ||
599 | */ | |
600 | ||
601 | ||
602 | /* | |
603 | * create a card proc file | |
604 | * called from init.c | |
605 | */ | |
606 | int snd_info_card_create(snd_card_t * card) | |
607 | { | |
608 | char str[8]; | |
609 | snd_info_entry_t *entry; | |
610 | ||
611 | snd_assert(card != NULL, return -ENXIO); | |
612 | ||
613 | sprintf(str, "card%i", card->number); | |
614 | if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL) | |
615 | return -ENOMEM; | |
616 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
617 | if (snd_info_register(entry) < 0) { | |
618 | snd_info_free_entry(entry); | |
619 | return -ENOMEM; | |
620 | } | |
621 | card->proc_root = entry; | |
622 | return 0; | |
623 | } | |
624 | ||
625 | /* | |
626 | * register the card proc file | |
627 | * called from init.c | |
628 | */ | |
629 | int snd_info_card_register(snd_card_t * card) | |
630 | { | |
631 | struct proc_dir_entry *p; | |
632 | ||
633 | snd_assert(card != NULL, return -ENXIO); | |
634 | ||
635 | if (!strcmp(card->id, card->proc_root->name)) | |
636 | return 0; | |
637 | ||
638 | p = proc_symlink(card->id, snd_proc_root, card->proc_root->name); | |
639 | if (p == NULL) | |
640 | return -ENOMEM; | |
641 | card->proc_root_link = p; | |
642 | return 0; | |
643 | } | |
644 | ||
645 | /* | |
646 | * de-register the card proc file | |
647 | * called from init.c | |
648 | */ | |
649 | int snd_info_card_free(snd_card_t * card) | |
650 | { | |
651 | snd_assert(card != NULL, return -ENXIO); | |
652 | if (card->proc_root_link) { | |
653 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); | |
654 | card->proc_root_link = NULL; | |
655 | } | |
656 | if (card->proc_root) { | |
657 | snd_info_unregister(card->proc_root); | |
658 | card->proc_root = NULL; | |
659 | } | |
660 | return 0; | |
661 | } | |
662 | ||
663 | ||
664 | /** | |
665 | * snd_info_get_line - read one line from the procfs buffer | |
666 | * @buffer: the procfs buffer | |
667 | * @line: the buffer to store | |
668 | * @len: the max. buffer size - 1 | |
669 | * | |
670 | * Reads one line from the buffer and stores the string. | |
671 | * | |
672 | * Returns zero if successful, or 1 if error or EOF. | |
673 | */ | |
674 | int snd_info_get_line(snd_info_buffer_t * buffer, char *line, int len) | |
675 | { | |
676 | int c = -1; | |
677 | ||
678 | if (len <= 0 || buffer->stop || buffer->error) | |
679 | return 1; | |
680 | while (--len > 0) { | |
681 | c = *buffer->curr++; | |
682 | if (c == '\n') { | |
683 | if ((buffer->curr - buffer->buffer) >= (long)buffer->size) { | |
684 | buffer->stop = 1; | |
685 | } | |
686 | break; | |
687 | } | |
688 | *line++ = c; | |
689 | if ((buffer->curr - buffer->buffer) >= (long)buffer->size) { | |
690 | buffer->stop = 1; | |
691 | break; | |
692 | } | |
693 | } | |
694 | while (c != '\n' && !buffer->stop) { | |
695 | c = *buffer->curr++; | |
696 | if ((buffer->curr - buffer->buffer) >= (long)buffer->size) { | |
697 | buffer->stop = 1; | |
698 | } | |
699 | } | |
700 | *line = '\0'; | |
701 | return 0; | |
702 | } | |
703 | ||
704 | /** | |
856def8a | 705 | * snd_info_get_str - parse a string token |
1da177e4 LT |
706 | * @dest: the buffer to store the string token |
707 | * @src: the original string | |
708 | * @len: the max. length of token - 1 | |
709 | * | |
710 | * Parses the original string and copy a token to the given | |
711 | * string buffer. | |
712 | * | |
713 | * Returns the updated pointer of the original string so that | |
714 | * it can be used for the next call. | |
715 | */ | |
716 | char *snd_info_get_str(char *dest, char *src, int len) | |
717 | { | |
718 | int c; | |
719 | ||
720 | while (*src == ' ' || *src == '\t') | |
721 | src++; | |
722 | if (*src == '"' || *src == '\'') { | |
723 | c = *src++; | |
724 | while (--len > 0 && *src && *src != c) { | |
725 | *dest++ = *src++; | |
726 | } | |
727 | if (*src == c) | |
728 | src++; | |
729 | } else { | |
730 | while (--len > 0 && *src && *src != ' ' && *src != '\t') { | |
731 | *dest++ = *src++; | |
732 | } | |
733 | } | |
734 | *dest = 0; | |
735 | while (*src == ' ' || *src == '\t') | |
736 | src++; | |
737 | return src; | |
738 | } | |
739 | ||
740 | /** | |
741 | * snd_info_create_entry - create an info entry | |
742 | * @name: the proc file name | |
743 | * | |
744 | * Creates an info entry with the given file name and initializes as | |
745 | * the default state. | |
746 | * | |
747 | * Usually called from other functions such as | |
748 | * snd_info_create_card_entry(). | |
749 | * | |
750 | * Returns the pointer of the new instance, or NULL on failure. | |
751 | */ | |
752 | static snd_info_entry_t *snd_info_create_entry(const char *name) | |
753 | { | |
754 | snd_info_entry_t *entry; | |
755 | entry = kcalloc(1, sizeof(*entry), GFP_KERNEL); | |
756 | if (entry == NULL) | |
757 | return NULL; | |
543537bd | 758 | entry->name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
759 | if (entry->name == NULL) { |
760 | kfree(entry); | |
761 | return NULL; | |
762 | } | |
763 | entry->mode = S_IFREG | S_IRUGO; | |
764 | entry->content = SNDRV_INFO_CONTENT_TEXT; | |
765 | init_MUTEX(&entry->access); | |
766 | return entry; | |
767 | } | |
768 | ||
769 | /** | |
770 | * snd_info_create_module_entry - create an info entry for the given module | |
771 | * @module: the module pointer | |
772 | * @name: the file name | |
773 | * @parent: the parent directory | |
774 | * | |
775 | * Creates a new info entry and assigns it to the given module. | |
776 | * | |
777 | * Returns the pointer of the new instance, or NULL on failure. | |
778 | */ | |
779 | snd_info_entry_t *snd_info_create_module_entry(struct module * module, | |
780 | const char *name, | |
781 | snd_info_entry_t *parent) | |
782 | { | |
783 | snd_info_entry_t *entry = snd_info_create_entry(name); | |
784 | if (entry) { | |
785 | entry->module = module; | |
786 | entry->parent = parent; | |
787 | } | |
788 | return entry; | |
789 | } | |
790 | ||
791 | /** | |
792 | * snd_info_create_card_entry - create an info entry for the given card | |
793 | * @card: the card instance | |
794 | * @name: the file name | |
795 | * @parent: the parent directory | |
796 | * | |
797 | * Creates a new info entry and assigns it to the given card. | |
798 | * | |
799 | * Returns the pointer of the new instance, or NULL on failure. | |
800 | */ | |
801 | snd_info_entry_t *snd_info_create_card_entry(snd_card_t * card, | |
802 | const char *name, | |
803 | snd_info_entry_t * parent) | |
804 | { | |
805 | snd_info_entry_t *entry = snd_info_create_entry(name); | |
806 | if (entry) { | |
807 | entry->module = card->module; | |
808 | entry->card = card; | |
809 | entry->parent = parent; | |
810 | } | |
811 | return entry; | |
812 | } | |
813 | ||
814 | static int snd_info_dev_free_entry(snd_device_t *device) | |
815 | { | |
816 | snd_info_entry_t *entry = device->device_data; | |
817 | snd_info_free_entry(entry); | |
818 | return 0; | |
819 | } | |
820 | ||
821 | static int snd_info_dev_register_entry(snd_device_t *device) | |
822 | { | |
823 | snd_info_entry_t *entry = device->device_data; | |
824 | return snd_info_register(entry); | |
825 | } | |
826 | ||
827 | static int snd_info_dev_disconnect_entry(snd_device_t *device) | |
828 | { | |
829 | snd_info_entry_t *entry = device->device_data; | |
830 | entry->disconnected = 1; | |
831 | return 0; | |
832 | } | |
833 | ||
834 | static int snd_info_dev_unregister_entry(snd_device_t *device) | |
835 | { | |
836 | snd_info_entry_t *entry = device->device_data; | |
837 | return snd_info_unregister(entry); | |
838 | } | |
839 | ||
840 | /** | |
841 | * snd_card_proc_new - create an info entry for the given card | |
842 | * @card: the card instance | |
843 | * @name: the file name | |
844 | * @entryp: the pointer to store the new info entry | |
845 | * | |
846 | * Creates a new info entry and assigns it to the given card. | |
847 | * Unlike snd_info_create_card_entry(), this function registers the | |
848 | * info entry as an ALSA device component, so that it can be | |
849 | * unregistered/released without explicit call. | |
850 | * Also, you don't have to register this entry via snd_info_register(), | |
851 | * since this will be registered by snd_card_register() automatically. | |
852 | * | |
853 | * The parent is assumed as card->proc_root. | |
854 | * | |
855 | * For releasing this entry, use snd_device_free() instead of | |
856 | * snd_info_free_entry(). | |
857 | * | |
858 | * Returns zero if successful, or a negative error code on failure. | |
859 | */ | |
860 | int snd_card_proc_new(snd_card_t *card, const char *name, | |
861 | snd_info_entry_t **entryp) | |
862 | { | |
863 | static snd_device_ops_t ops = { | |
864 | .dev_free = snd_info_dev_free_entry, | |
865 | .dev_register = snd_info_dev_register_entry, | |
866 | .dev_disconnect = snd_info_dev_disconnect_entry, | |
867 | .dev_unregister = snd_info_dev_unregister_entry | |
868 | }; | |
869 | snd_info_entry_t *entry; | |
870 | int err; | |
871 | ||
872 | entry = snd_info_create_card_entry(card, name, card->proc_root); | |
873 | if (! entry) | |
874 | return -ENOMEM; | |
875 | if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) { | |
876 | snd_info_free_entry(entry); | |
877 | return err; | |
878 | } | |
879 | if (entryp) | |
880 | *entryp = entry; | |
881 | return 0; | |
882 | } | |
883 | ||
884 | /** | |
885 | * snd_info_free_entry - release the info entry | |
886 | * @entry: the info entry | |
887 | * | |
888 | * Releases the info entry. Don't call this after registered. | |
889 | */ | |
890 | void snd_info_free_entry(snd_info_entry_t * entry) | |
891 | { | |
892 | if (entry == NULL) | |
893 | return; | |
894 | kfree(entry->name); | |
895 | if (entry->private_free) | |
896 | entry->private_free(entry); | |
897 | kfree(entry); | |
898 | } | |
899 | ||
900 | /** | |
901 | * snd_info_register - register the info entry | |
902 | * @entry: the info entry | |
903 | * | |
904 | * Registers the proc info entry. | |
905 | * | |
906 | * Returns zero if successful, or a negative error code on failure. | |
907 | */ | |
908 | int snd_info_register(snd_info_entry_t * entry) | |
909 | { | |
910 | struct proc_dir_entry *root, *p = NULL; | |
911 | ||
912 | snd_assert(entry != NULL, return -ENXIO); | |
913 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; | |
914 | down(&info_mutex); | |
915 | p = snd_create_proc_entry(entry->name, entry->mode, root); | |
916 | if (!p) { | |
917 | up(&info_mutex); | |
918 | return -ENOMEM; | |
919 | } | |
920 | p->owner = entry->module; | |
921 | if (!S_ISDIR(entry->mode)) | |
922 | p->proc_fops = &snd_info_entry_operations; | |
923 | p->size = entry->size; | |
924 | p->data = entry; | |
925 | entry->p = p; | |
926 | up(&info_mutex); | |
927 | return 0; | |
928 | } | |
929 | ||
930 | /** | |
931 | * snd_info_unregister - de-register the info entry | |
932 | * @entry: the info entry | |
933 | * | |
934 | * De-registers the info entry and releases the instance. | |
935 | * | |
936 | * Returns zero if successful, or a negative error code on failure. | |
937 | */ | |
938 | int snd_info_unregister(snd_info_entry_t * entry) | |
939 | { | |
940 | struct proc_dir_entry *root; | |
941 | ||
856def8a HK |
942 | snd_assert(entry != NULL, return -ENXIO); |
943 | snd_assert(entry->p != NULL, return -ENXIO); | |
1da177e4 LT |
944 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; |
945 | snd_assert(root, return -ENXIO); | |
946 | down(&info_mutex); | |
947 | snd_remove_proc_entry(root, entry->p); | |
948 | up(&info_mutex); | |
949 | snd_info_free_entry(entry); | |
950 | return 0; | |
951 | } | |
952 | ||
953 | /* | |
954 | ||
955 | */ | |
956 | ||
957 | static snd_info_entry_t *snd_info_version_entry = NULL; | |
958 | ||
959 | static void snd_info_version_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) | |
960 | { | |
961 | snd_iprintf(buffer, | |
962 | "Advanced Linux Sound Architecture Driver Version " | |
963 | CONFIG_SND_VERSION CONFIG_SND_DATE ".\n" | |
964 | ); | |
965 | } | |
966 | ||
967 | static int __init snd_info_version_init(void) | |
968 | { | |
969 | snd_info_entry_t *entry; | |
970 | ||
971 | entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL); | |
972 | if (entry == NULL) | |
973 | return -ENOMEM; | |
974 | entry->c.text.read_size = 256; | |
975 | entry->c.text.read = snd_info_version_read; | |
976 | if (snd_info_register(entry) < 0) { | |
977 | snd_info_free_entry(entry); | |
978 | return -ENOMEM; | |
979 | } | |
980 | snd_info_version_entry = entry; | |
981 | return 0; | |
982 | } | |
983 | ||
984 | static int __exit snd_info_version_done(void) | |
985 | { | |
986 | if (snd_info_version_entry) | |
987 | snd_info_unregister(snd_info_version_entry); | |
988 | return 0; | |
989 | } | |
990 | ||
991 | #endif /* CONFIG_PROC_FS */ |