Commit | Line | Data |
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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 | ||
e28563cc TI |
40 | #ifdef CONFIG_PROC_FS |
41 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
71 | static DECLARE_MUTEX(info_mutex); |
72 | ||
24c1f931 TI |
73 | struct snd_info_private_data { |
74 | struct snd_info_buffer *rbuffer; | |
75 | struct snd_info_buffer *wbuffer; | |
76 | struct snd_info_entry *entry; | |
1da177e4 | 77 | void *file_private_data; |
24c1f931 | 78 | }; |
1da177e4 LT |
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 | */ | |
24c1f931 | 93 | int snd_iprintf(struct snd_info_buffer *buffer, char *fmt,...) |
1da177e4 LT |
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; | |
24c1f931 | 118 | struct snd_info_entry *snd_seq_root = NULL; |
1da177e4 | 119 | #ifdef CONFIG_SND_OSSEMUL |
24c1f931 | 120 | struct snd_info_entry *snd_oss_root = NULL; |
1da177e4 LT |
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 | { | |
24c1f931 | 137 | struct snd_info_private_data *data; |
1da177e4 LT |
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 | { | |
24c1f931 | 179 | struct snd_info_private_data *data; |
1da177e4 | 180 | struct snd_info_entry *entry; |
24c1f931 | 181 | struct snd_info_buffer *buf; |
1da177e4 LT |
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 | { | |
24c1f931 | 220 | struct snd_info_private_data *data; |
1da177e4 | 221 | struct snd_info_entry *entry; |
24c1f931 | 222 | struct snd_info_buffer *buf; |
1da177e4 LT |
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 | { | |
24c1f931 TI |
262 | struct snd_info_entry *entry; |
263 | struct snd_info_private_data *data; | |
264 | struct snd_info_buffer *buffer; | |
1da177e4 LT |
265 | struct proc_dir_entry *p; |
266 | int mode, err; | |
267 | ||
268 | down(&info_mutex); | |
269 | p = PDE(inode); | |
24c1f931 | 270 | entry = p == NULL ? NULL : (struct snd_info_entry *)p->data; |
1da177e4 LT |
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 | } | |
ca2c0966 | 298 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
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) { | |
ca2c0966 | 307 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
1da177e4 LT |
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) { | |
ca2c0966 | 326 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
1da177e4 LT |
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 | { | |
24c1f931 TI |
384 | struct snd_info_entry *entry; |
385 | struct snd_info_private_data *data; | |
1da177e4 LT |
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 | { | |
24c1f931 | 423 | struct snd_info_private_data *data; |
1da177e4 LT |
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 | ||
d99e9889 IM |
447 | static long snd_info_entry_ioctl(struct file *file, unsigned int cmd, |
448 | unsigned long arg) | |
1da177e4 | 449 | { |
24c1f931 | 450 | struct snd_info_private_data *data; |
1da177e4 LT |
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 | ||
1da177e4 LT |
468 | static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma) |
469 | { | |
470 | struct inode *inode = file->f_dentry->d_inode; | |
24c1f931 | 471 | struct snd_info_private_data *data; |
1da177e4 LT |
472 | struct snd_info_entry *entry; |
473 | ||
474 | data = file->private_data; | |
475 | if (data == NULL) | |
476 | return 0; | |
477 | entry = data->entry; | |
478 | switch (entry->content) { | |
479 | case SNDRV_INFO_CONTENT_DATA: | |
480 | if (entry->c.ops->mmap) | |
481 | return entry->c.ops->mmap(entry, | |
482 | data->file_private_data, | |
483 | inode, file, vma); | |
484 | break; | |
485 | } | |
486 | return -ENXIO; | |
487 | } | |
488 | ||
489 | static struct file_operations snd_info_entry_operations = | |
490 | { | |
d99e9889 IM |
491 | .owner = THIS_MODULE, |
492 | .llseek = snd_info_entry_llseek, | |
493 | .read = snd_info_entry_read, | |
494 | .write = snd_info_entry_write, | |
495 | .poll = snd_info_entry_poll, | |
496 | .unlocked_ioctl = snd_info_entry_ioctl, | |
497 | .mmap = snd_info_entry_mmap, | |
498 | .open = snd_info_entry_open, | |
499 | .release = snd_info_entry_release, | |
1da177e4 LT |
500 | }; |
501 | ||
502 | /** | |
503 | * snd_create_proc_entry - create a procfs entry | |
504 | * @name: the name of the proc file | |
505 | * @mode: the file permission bits, S_Ixxx | |
506 | * @parent: the parent proc-directory entry | |
507 | * | |
508 | * Creates a new proc file entry with the given name and permission | |
509 | * on the given directory. | |
510 | * | |
511 | * Returns the pointer of new instance or NULL on failure. | |
512 | */ | |
513 | static struct proc_dir_entry *snd_create_proc_entry(const char *name, mode_t mode, | |
514 | struct proc_dir_entry *parent) | |
515 | { | |
516 | struct proc_dir_entry *p; | |
517 | p = create_proc_entry(name, mode, parent); | |
518 | if (p) | |
519 | snd_info_entry_prepare(p); | |
520 | return p; | |
521 | } | |
522 | ||
523 | int __init snd_info_init(void) | |
524 | { | |
525 | struct proc_dir_entry *p; | |
526 | ||
527 | p = snd_create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, &proc_root); | |
528 | if (p == NULL) | |
529 | return -ENOMEM; | |
530 | snd_proc_root = p; | |
531 | #ifdef CONFIG_SND_OSSEMUL | |
532 | { | |
24c1f931 | 533 | struct snd_info_entry *entry; |
1da177e4 LT |
534 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL) |
535 | return -ENOMEM; | |
536 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
537 | if (snd_info_register(entry) < 0) { | |
538 | snd_info_free_entry(entry); | |
539 | return -ENOMEM; | |
540 | } | |
541 | snd_oss_root = entry; | |
542 | } | |
543 | #endif | |
544 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
545 | { | |
24c1f931 | 546 | struct snd_info_entry *entry; |
1da177e4 LT |
547 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL) |
548 | return -ENOMEM; | |
549 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
550 | if (snd_info_register(entry) < 0) { | |
551 | snd_info_free_entry(entry); | |
552 | return -ENOMEM; | |
553 | } | |
554 | snd_seq_root = entry; | |
555 | } | |
556 | #endif | |
557 | snd_info_version_init(); | |
1da177e4 LT |
558 | snd_minor_info_init(); |
559 | snd_minor_info_oss_init(); | |
560 | snd_card_info_init(); | |
561 | return 0; | |
562 | } | |
563 | ||
564 | int __exit snd_info_done(void) | |
565 | { | |
566 | snd_card_info_done(); | |
567 | snd_minor_info_oss_done(); | |
568 | snd_minor_info_done(); | |
1da177e4 LT |
569 | snd_info_version_done(); |
570 | if (snd_proc_root) { | |
571 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
e28563cc | 572 | snd_info_unregister(snd_seq_root); |
1da177e4 LT |
573 | #endif |
574 | #ifdef CONFIG_SND_OSSEMUL | |
e28563cc | 575 | snd_info_unregister(snd_oss_root); |
1da177e4 LT |
576 | #endif |
577 | snd_remove_proc_entry(&proc_root, snd_proc_root); | |
578 | } | |
579 | return 0; | |
580 | } | |
581 | ||
582 | /* | |
583 | ||
584 | */ | |
585 | ||
586 | ||
587 | /* | |
588 | * create a card proc file | |
589 | * called from init.c | |
590 | */ | |
24c1f931 | 591 | int snd_info_card_create(struct snd_card *card) |
1da177e4 LT |
592 | { |
593 | char str[8]; | |
24c1f931 | 594 | struct snd_info_entry *entry; |
1da177e4 LT |
595 | |
596 | snd_assert(card != NULL, return -ENXIO); | |
597 | ||
598 | sprintf(str, "card%i", card->number); | |
599 | if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL) | |
600 | return -ENOMEM; | |
601 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
602 | if (snd_info_register(entry) < 0) { | |
603 | snd_info_free_entry(entry); | |
604 | return -ENOMEM; | |
605 | } | |
606 | card->proc_root = entry; | |
607 | return 0; | |
608 | } | |
609 | ||
610 | /* | |
611 | * register the card proc file | |
612 | * called from init.c | |
613 | */ | |
24c1f931 | 614 | int snd_info_card_register(struct snd_card *card) |
1da177e4 LT |
615 | { |
616 | struct proc_dir_entry *p; | |
617 | ||
618 | snd_assert(card != NULL, return -ENXIO); | |
619 | ||
620 | if (!strcmp(card->id, card->proc_root->name)) | |
621 | return 0; | |
622 | ||
623 | p = proc_symlink(card->id, snd_proc_root, card->proc_root->name); | |
624 | if (p == NULL) | |
625 | return -ENOMEM; | |
626 | card->proc_root_link = p; | |
627 | return 0; | |
628 | } | |
629 | ||
630 | /* | |
631 | * de-register the card proc file | |
632 | * called from init.c | |
633 | */ | |
24c1f931 | 634 | int snd_info_card_free(struct snd_card *card) |
1da177e4 LT |
635 | { |
636 | snd_assert(card != NULL, return -ENXIO); | |
637 | if (card->proc_root_link) { | |
638 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); | |
639 | card->proc_root_link = NULL; | |
640 | } | |
641 | if (card->proc_root) { | |
642 | snd_info_unregister(card->proc_root); | |
643 | card->proc_root = NULL; | |
644 | } | |
645 | return 0; | |
646 | } | |
647 | ||
648 | ||
649 | /** | |
650 | * snd_info_get_line - read one line from the procfs buffer | |
651 | * @buffer: the procfs buffer | |
652 | * @line: the buffer to store | |
653 | * @len: the max. buffer size - 1 | |
654 | * | |
655 | * Reads one line from the buffer and stores the string. | |
656 | * | |
657 | * Returns zero if successful, or 1 if error or EOF. | |
658 | */ | |
24c1f931 | 659 | int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) |
1da177e4 LT |
660 | { |
661 | int c = -1; | |
662 | ||
663 | if (len <= 0 || buffer->stop || buffer->error) | |
664 | return 1; | |
665 | while (--len > 0) { | |
666 | c = *buffer->curr++; | |
667 | if (c == '\n') { | |
668 | if ((buffer->curr - buffer->buffer) >= (long)buffer->size) { | |
669 | buffer->stop = 1; | |
670 | } | |
671 | break; | |
672 | } | |
673 | *line++ = c; | |
674 | if ((buffer->curr - buffer->buffer) >= (long)buffer->size) { | |
675 | buffer->stop = 1; | |
676 | break; | |
677 | } | |
678 | } | |
679 | while (c != '\n' && !buffer->stop) { | |
680 | c = *buffer->curr++; | |
681 | if ((buffer->curr - buffer->buffer) >= (long)buffer->size) { | |
682 | buffer->stop = 1; | |
683 | } | |
684 | } | |
685 | *line = '\0'; | |
686 | return 0; | |
687 | } | |
688 | ||
689 | /** | |
856def8a | 690 | * snd_info_get_str - parse a string token |
1da177e4 LT |
691 | * @dest: the buffer to store the string token |
692 | * @src: the original string | |
693 | * @len: the max. length of token - 1 | |
694 | * | |
695 | * Parses the original string and copy a token to the given | |
696 | * string buffer. | |
697 | * | |
698 | * Returns the updated pointer of the original string so that | |
699 | * it can be used for the next call. | |
700 | */ | |
701 | char *snd_info_get_str(char *dest, char *src, int len) | |
702 | { | |
703 | int c; | |
704 | ||
705 | while (*src == ' ' || *src == '\t') | |
706 | src++; | |
707 | if (*src == '"' || *src == '\'') { | |
708 | c = *src++; | |
709 | while (--len > 0 && *src && *src != c) { | |
710 | *dest++ = *src++; | |
711 | } | |
712 | if (*src == c) | |
713 | src++; | |
714 | } else { | |
715 | while (--len > 0 && *src && *src != ' ' && *src != '\t') { | |
716 | *dest++ = *src++; | |
717 | } | |
718 | } | |
719 | *dest = 0; | |
720 | while (*src == ' ' || *src == '\t') | |
721 | src++; | |
722 | return src; | |
723 | } | |
724 | ||
725 | /** | |
726 | * snd_info_create_entry - create an info entry | |
727 | * @name: the proc file name | |
728 | * | |
729 | * Creates an info entry with the given file name and initializes as | |
730 | * the default state. | |
731 | * | |
732 | * Usually called from other functions such as | |
733 | * snd_info_create_card_entry(). | |
734 | * | |
735 | * Returns the pointer of the new instance, or NULL on failure. | |
736 | */ | |
24c1f931 | 737 | static struct snd_info_entry *snd_info_create_entry(const char *name) |
1da177e4 | 738 | { |
24c1f931 | 739 | struct snd_info_entry *entry; |
ca2c0966 | 740 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
1da177e4 LT |
741 | if (entry == NULL) |
742 | return NULL; | |
543537bd | 743 | entry->name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
744 | if (entry->name == NULL) { |
745 | kfree(entry); | |
746 | return NULL; | |
747 | } | |
748 | entry->mode = S_IFREG | S_IRUGO; | |
749 | entry->content = SNDRV_INFO_CONTENT_TEXT; | |
750 | init_MUTEX(&entry->access); | |
751 | return entry; | |
752 | } | |
753 | ||
754 | /** | |
755 | * snd_info_create_module_entry - create an info entry for the given module | |
756 | * @module: the module pointer | |
757 | * @name: the file name | |
758 | * @parent: the parent directory | |
759 | * | |
760 | * Creates a new info entry and assigns it to the given module. | |
761 | * | |
762 | * Returns the pointer of the new instance, or NULL on failure. | |
763 | */ | |
24c1f931 | 764 | struct snd_info_entry *snd_info_create_module_entry(struct module * module, |
1da177e4 | 765 | const char *name, |
24c1f931 | 766 | struct snd_info_entry *parent) |
1da177e4 | 767 | { |
24c1f931 | 768 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
769 | if (entry) { |
770 | entry->module = module; | |
771 | entry->parent = parent; | |
772 | } | |
773 | return entry; | |
774 | } | |
775 | ||
776 | /** | |
777 | * snd_info_create_card_entry - create an info entry for the given card | |
778 | * @card: the card instance | |
779 | * @name: the file name | |
780 | * @parent: the parent directory | |
781 | * | |
782 | * Creates a new info entry and assigns it to the given card. | |
783 | * | |
784 | * Returns the pointer of the new instance, or NULL on failure. | |
785 | */ | |
24c1f931 | 786 | struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, |
1da177e4 | 787 | const char *name, |
24c1f931 | 788 | struct snd_info_entry * parent) |
1da177e4 | 789 | { |
24c1f931 | 790 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
791 | if (entry) { |
792 | entry->module = card->module; | |
793 | entry->card = card; | |
794 | entry->parent = parent; | |
795 | } | |
796 | return entry; | |
797 | } | |
798 | ||
24c1f931 | 799 | static int snd_info_dev_free_entry(struct snd_device *device) |
1da177e4 | 800 | { |
24c1f931 | 801 | struct snd_info_entry *entry = device->device_data; |
1da177e4 LT |
802 | snd_info_free_entry(entry); |
803 | return 0; | |
804 | } | |
805 | ||
24c1f931 | 806 | static int snd_info_dev_register_entry(struct snd_device *device) |
1da177e4 | 807 | { |
24c1f931 | 808 | struct snd_info_entry *entry = device->device_data; |
1da177e4 LT |
809 | return snd_info_register(entry); |
810 | } | |
811 | ||
24c1f931 | 812 | static int snd_info_dev_disconnect_entry(struct snd_device *device) |
1da177e4 | 813 | { |
24c1f931 | 814 | struct snd_info_entry *entry = device->device_data; |
1da177e4 LT |
815 | entry->disconnected = 1; |
816 | return 0; | |
817 | } | |
818 | ||
24c1f931 | 819 | static int snd_info_dev_unregister_entry(struct snd_device *device) |
1da177e4 | 820 | { |
24c1f931 | 821 | struct snd_info_entry *entry = device->device_data; |
1da177e4 LT |
822 | return snd_info_unregister(entry); |
823 | } | |
824 | ||
825 | /** | |
826 | * snd_card_proc_new - create an info entry for the given card | |
827 | * @card: the card instance | |
828 | * @name: the file name | |
829 | * @entryp: the pointer to store the new info entry | |
830 | * | |
831 | * Creates a new info entry and assigns it to the given card. | |
832 | * Unlike snd_info_create_card_entry(), this function registers the | |
833 | * info entry as an ALSA device component, so that it can be | |
834 | * unregistered/released without explicit call. | |
835 | * Also, you don't have to register this entry via snd_info_register(), | |
836 | * since this will be registered by snd_card_register() automatically. | |
837 | * | |
838 | * The parent is assumed as card->proc_root. | |
839 | * | |
840 | * For releasing this entry, use snd_device_free() instead of | |
841 | * snd_info_free_entry(). | |
842 | * | |
843 | * Returns zero if successful, or a negative error code on failure. | |
844 | */ | |
24c1f931 TI |
845 | int snd_card_proc_new(struct snd_card *card, const char *name, |
846 | struct snd_info_entry **entryp) | |
1da177e4 | 847 | { |
24c1f931 | 848 | static struct snd_device_ops ops = { |
1da177e4 LT |
849 | .dev_free = snd_info_dev_free_entry, |
850 | .dev_register = snd_info_dev_register_entry, | |
851 | .dev_disconnect = snd_info_dev_disconnect_entry, | |
852 | .dev_unregister = snd_info_dev_unregister_entry | |
853 | }; | |
24c1f931 | 854 | struct snd_info_entry *entry; |
1da177e4 LT |
855 | int err; |
856 | ||
857 | entry = snd_info_create_card_entry(card, name, card->proc_root); | |
858 | if (! entry) | |
859 | return -ENOMEM; | |
860 | if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) { | |
861 | snd_info_free_entry(entry); | |
862 | return err; | |
863 | } | |
864 | if (entryp) | |
865 | *entryp = entry; | |
866 | return 0; | |
867 | } | |
868 | ||
869 | /** | |
870 | * snd_info_free_entry - release the info entry | |
871 | * @entry: the info entry | |
872 | * | |
873 | * Releases the info entry. Don't call this after registered. | |
874 | */ | |
24c1f931 | 875 | void snd_info_free_entry(struct snd_info_entry * entry) |
1da177e4 LT |
876 | { |
877 | if (entry == NULL) | |
878 | return; | |
879 | kfree(entry->name); | |
880 | if (entry->private_free) | |
881 | entry->private_free(entry); | |
882 | kfree(entry); | |
883 | } | |
884 | ||
885 | /** | |
886 | * snd_info_register - register the info entry | |
887 | * @entry: the info entry | |
888 | * | |
889 | * Registers the proc info entry. | |
890 | * | |
891 | * Returns zero if successful, or a negative error code on failure. | |
892 | */ | |
24c1f931 | 893 | int snd_info_register(struct snd_info_entry * entry) |
1da177e4 LT |
894 | { |
895 | struct proc_dir_entry *root, *p = NULL; | |
896 | ||
897 | snd_assert(entry != NULL, return -ENXIO); | |
898 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; | |
899 | down(&info_mutex); | |
900 | p = snd_create_proc_entry(entry->name, entry->mode, root); | |
901 | if (!p) { | |
902 | up(&info_mutex); | |
903 | return -ENOMEM; | |
904 | } | |
905 | p->owner = entry->module; | |
906 | if (!S_ISDIR(entry->mode)) | |
907 | p->proc_fops = &snd_info_entry_operations; | |
908 | p->size = entry->size; | |
909 | p->data = entry; | |
910 | entry->p = p; | |
911 | up(&info_mutex); | |
912 | return 0; | |
913 | } | |
914 | ||
915 | /** | |
916 | * snd_info_unregister - de-register the info entry | |
917 | * @entry: the info entry | |
918 | * | |
919 | * De-registers the info entry and releases the instance. | |
920 | * | |
921 | * Returns zero if successful, or a negative error code on failure. | |
922 | */ | |
24c1f931 | 923 | int snd_info_unregister(struct snd_info_entry * entry) |
1da177e4 LT |
924 | { |
925 | struct proc_dir_entry *root; | |
926 | ||
e28563cc TI |
927 | if (! entry) |
928 | return 0; | |
856def8a | 929 | snd_assert(entry->p != NULL, return -ENXIO); |
1da177e4 LT |
930 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; |
931 | snd_assert(root, return -ENXIO); | |
932 | down(&info_mutex); | |
933 | snd_remove_proc_entry(root, entry->p); | |
934 | up(&info_mutex); | |
935 | snd_info_free_entry(entry); | |
936 | return 0; | |
937 | } | |
938 | ||
939 | /* | |
940 | ||
941 | */ | |
942 | ||
24c1f931 | 943 | static struct snd_info_entry *snd_info_version_entry = NULL; |
1da177e4 | 944 | |
24c1f931 | 945 | static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) |
1da177e4 LT |
946 | { |
947 | snd_iprintf(buffer, | |
948 | "Advanced Linux Sound Architecture Driver Version " | |
949 | CONFIG_SND_VERSION CONFIG_SND_DATE ".\n" | |
950 | ); | |
951 | } | |
952 | ||
953 | static int __init snd_info_version_init(void) | |
954 | { | |
24c1f931 | 955 | struct snd_info_entry *entry; |
1da177e4 LT |
956 | |
957 | entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL); | |
958 | if (entry == NULL) | |
959 | return -ENOMEM; | |
960 | entry->c.text.read_size = 256; | |
961 | entry->c.text.read = snd_info_version_read; | |
962 | if (snd_info_register(entry) < 0) { | |
963 | snd_info_free_entry(entry); | |
964 | return -ENOMEM; | |
965 | } | |
966 | snd_info_version_entry = entry; | |
967 | return 0; | |
968 | } | |
969 | ||
970 | static int __exit snd_info_version_done(void) | |
971 | { | |
972 | if (snd_info_version_entry) | |
973 | snd_info_unregister(snd_info_version_entry); | |
974 | return 0; | |
975 | } | |
976 | ||
977 | #endif /* CONFIG_PROC_FS */ |