Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Information interface for ALSA driver | |
c1017a4c | 3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
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 | ||
1da177e4 | 22 | #include <linux/init.h> |
1da177e4 | 23 | #include <linux/time.h> |
27ac792c | 24 | #include <linux/mm.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
543537bd | 26 | #include <linux/string.h> |
da155d5b | 27 | #include <linux/module.h> |
1da177e4 LT |
28 | #include <sound/core.h> |
29 | #include <sound/minors.h> | |
30 | #include <sound/info.h> | |
42662748 | 31 | #include <linux/utsname.h> |
1da177e4 | 32 | #include <linux/proc_fs.h> |
1a60d4c5 | 33 | #include <linux/mutex.h> |
1da177e4 LT |
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 | ||
1a60d4c5 | 71 | static DEFINE_MUTEX(info_mutex); |
1da177e4 | 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); | |
746d4a02 | 82 | static void snd_info_disconnect(struct snd_info_entry *entry); |
1da177e4 | 83 | |
1da177e4 LT |
84 | /* |
85 | ||
86 | */ | |
87 | ||
6581f4e7 TI |
88 | static struct proc_dir_entry *snd_proc_root; |
89 | struct snd_info_entry *snd_seq_root; | |
c0d3fb39 TI |
90 | EXPORT_SYMBOL(snd_seq_root); |
91 | ||
1da177e4 | 92 | #ifdef CONFIG_SND_OSSEMUL |
6581f4e7 | 93 | struct snd_info_entry *snd_oss_root; |
1da177e4 LT |
94 | #endif |
95 | ||
4adb7bcb TI |
96 | static int alloc_info_private(struct snd_info_entry *entry, |
97 | struct snd_info_private_data **ret) | |
98 | { | |
99 | struct snd_info_private_data *data; | |
100 | ||
101 | if (!entry || !entry->p) | |
102 | return -ENODEV; | |
103 | if (!try_module_get(entry->module)) | |
104 | return -EFAULT; | |
105 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
106 | if (!data) { | |
107 | module_put(entry->module); | |
108 | return -ENOMEM; | |
109 | } | |
110 | data->entry = entry; | |
111 | *ret = data; | |
112 | return 0; | |
113 | } | |
114 | ||
115 | static bool valid_pos(loff_t pos, size_t count) | |
116 | { | |
117 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
118 | return false; | |
119 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
120 | return false; | |
121 | return true; | |
122 | } | |
123 | ||
124 | /* | |
125 | * file ops for binary proc files | |
126 | */ | |
1da177e4 LT |
127 | static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig) |
128 | { | |
24c1f931 | 129 | struct snd_info_private_data *data; |
1da177e4 | 130 | struct snd_info_entry *entry; |
73029e0f | 131 | loff_t ret = -EINVAL, size; |
1da177e4 LT |
132 | |
133 | data = file->private_data; | |
134 | entry = data->entry; | |
5b5cd553 | 135 | mutex_lock(&entry->access); |
4adb7bcb | 136 | if (entry->c.ops->llseek) { |
73029e0f TI |
137 | offset = entry->c.ops->llseek(entry, |
138 | data->file_private_data, | |
139 | file, offset, orig); | |
140 | goto out; | |
141 | } | |
4adb7bcb TI |
142 | |
143 | size = entry->size; | |
73029e0f TI |
144 | switch (orig) { |
145 | case SEEK_SET: | |
146 | break; | |
147 | case SEEK_CUR: | |
148 | offset += file->f_pos; | |
1da177e4 | 149 | break; |
73029e0f TI |
150 | case SEEK_END: |
151 | if (!size) | |
1da177e4 | 152 | goto out; |
73029e0f | 153 | offset += size; |
1da177e4 | 154 | break; |
73029e0f TI |
155 | default: |
156 | goto out; | |
1da177e4 | 157 | } |
73029e0f TI |
158 | if (offset < 0) |
159 | goto out; | |
160 | if (size && offset > size) | |
161 | offset = size; | |
162 | file->f_pos = offset; | |
163 | ret = offset; | |
164 | out: | |
5b5cd553 | 165 | mutex_unlock(&entry->access); |
1da177e4 LT |
166 | return ret; |
167 | } | |
168 | ||
169 | static ssize_t snd_info_entry_read(struct file *file, char __user *buffer, | |
170 | size_t count, loff_t * offset) | |
171 | { | |
4adb7bcb TI |
172 | struct snd_info_private_data *data = file->private_data; |
173 | struct snd_info_entry *entry = data->entry; | |
174 | size_t size; | |
1da177e4 LT |
175 | loff_t pos; |
176 | ||
1da177e4 | 177 | pos = *offset; |
4adb7bcb | 178 | if (!valid_pos(pos, count)) |
1da177e4 | 179 | return -EIO; |
4adb7bcb TI |
180 | if (pos >= entry->size) |
181 | return 0; | |
182 | size = entry->size - pos; | |
183 | size = min(count, size); | |
184 | size = entry->c.ops->read(entry, data->file_private_data, | |
185 | file, buffer, size, pos); | |
1da177e4 LT |
186 | if ((ssize_t) size > 0) |
187 | *offset = pos + size; | |
188 | return size; | |
189 | } | |
190 | ||
191 | static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer, | |
192 | size_t count, loff_t * offset) | |
193 | { | |
4adb7bcb TI |
194 | struct snd_info_private_data *data = file->private_data; |
195 | struct snd_info_entry *entry = data->entry; | |
7e4eeec8 | 196 | ssize_t size = 0; |
1da177e4 LT |
197 | loff_t pos; |
198 | ||
1da177e4 | 199 | pos = *offset; |
4adb7bcb | 200 | if (!valid_pos(pos, count)) |
1da177e4 | 201 | return -EIO; |
4adb7bcb TI |
202 | if (count > 0) { |
203 | size_t maxsize = entry->size - pos; | |
204 | count = min(count, maxsize); | |
205 | size = entry->c.ops->write(entry, data->file_private_data, | |
206 | file, buffer, count, pos); | |
1da177e4 | 207 | } |
4adb7bcb | 208 | if (size > 0) |
1da177e4 LT |
209 | *offset = pos + size; |
210 | return size; | |
211 | } | |
212 | ||
4adb7bcb TI |
213 | static unsigned int snd_info_entry_poll(struct file *file, poll_table *wait) |
214 | { | |
215 | struct snd_info_private_data *data = file->private_data; | |
216 | struct snd_info_entry *entry = data->entry; | |
217 | unsigned int mask = 0; | |
218 | ||
219 | if (entry->c.ops->poll) | |
220 | return entry->c.ops->poll(entry, | |
221 | data->file_private_data, | |
222 | file, wait); | |
223 | if (entry->c.ops->read) | |
224 | mask |= POLLIN | POLLRDNORM; | |
225 | if (entry->c.ops->write) | |
226 | mask |= POLLOUT | POLLWRNORM; | |
227 | return mask; | |
228 | } | |
229 | ||
230 | static long snd_info_entry_ioctl(struct file *file, unsigned int cmd, | |
231 | unsigned long arg) | |
232 | { | |
233 | struct snd_info_private_data *data = file->private_data; | |
234 | struct snd_info_entry *entry = data->entry; | |
235 | ||
236 | if (!entry->c.ops->ioctl) | |
237 | return -ENOTTY; | |
238 | return entry->c.ops->ioctl(entry, data->file_private_data, | |
239 | file, cmd, arg); | |
240 | } | |
241 | ||
242 | static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma) | |
1da177e4 | 243 | { |
4adb7bcb TI |
244 | struct inode *inode = file_inode(file); |
245 | struct snd_info_private_data *data; | |
24c1f931 | 246 | struct snd_info_entry *entry; |
4adb7bcb TI |
247 | |
248 | data = file->private_data; | |
249 | if (data == NULL) | |
250 | return 0; | |
251 | entry = data->entry; | |
252 | if (!entry->c.ops->mmap) | |
253 | return -ENXIO; | |
254 | return entry->c.ops->mmap(entry, data->file_private_data, | |
255 | inode, file, vma); | |
256 | } | |
257 | ||
258 | static int snd_info_entry_open(struct inode *inode, struct file *file) | |
259 | { | |
260 | struct snd_info_entry *entry = PDE_DATA(inode); | |
24c1f931 | 261 | struct snd_info_private_data *data; |
1da177e4 LT |
262 | int mode, err; |
263 | ||
1a60d4c5 | 264 | mutex_lock(&info_mutex); |
4adb7bcb TI |
265 | err = alloc_info_private(entry, &data); |
266 | if (err < 0) | |
267 | goto unlock; | |
268 | ||
1da177e4 | 269 | mode = file->f_flags & O_ACCMODE; |
4adb7bcb TI |
270 | if (((mode == O_RDONLY || mode == O_RDWR) && !entry->c.ops->read) || |
271 | ((mode == O_WRONLY || mode == O_RDWR) && !entry->c.ops->write)) { | |
272 | err = -ENODEV; | |
273 | goto error; | |
1da177e4 | 274 | } |
4adb7bcb TI |
275 | |
276 | if (entry->c.ops->open) { | |
277 | err = entry->c.ops->open(entry, mode, &data->file_private_data); | |
278 | if (err < 0) | |
279 | goto error; | |
1da177e4 | 280 | } |
4adb7bcb | 281 | |
1da177e4 | 282 | file->private_data = data; |
1a60d4c5 | 283 | mutex_unlock(&info_mutex); |
1da177e4 LT |
284 | return 0; |
285 | ||
4adb7bcb | 286 | error: |
7e4eeec8 | 287 | kfree(data); |
1da177e4 | 288 | module_put(entry->module); |
4adb7bcb | 289 | unlock: |
1a60d4c5 | 290 | mutex_unlock(&info_mutex); |
1da177e4 LT |
291 | return err; |
292 | } | |
293 | ||
294 | static int snd_info_entry_release(struct inode *inode, struct file *file) | |
295 | { | |
4adb7bcb TI |
296 | struct snd_info_private_data *data = file->private_data; |
297 | struct snd_info_entry *entry = data->entry; | |
1da177e4 | 298 | |
4adb7bcb TI |
299 | if (entry->c.ops->release) |
300 | entry->c.ops->release(entry, file->f_flags & O_ACCMODE, | |
301 | data->file_private_data); | |
1da177e4 LT |
302 | module_put(entry->module); |
303 | kfree(data); | |
304 | return 0; | |
305 | } | |
306 | ||
4adb7bcb | 307 | static const struct file_operations snd_info_entry_operations = |
1da177e4 | 308 | { |
4adb7bcb TI |
309 | .owner = THIS_MODULE, |
310 | .llseek = snd_info_entry_llseek, | |
311 | .read = snd_info_entry_read, | |
312 | .write = snd_info_entry_write, | |
313 | .poll = snd_info_entry_poll, | |
314 | .unlocked_ioctl = snd_info_entry_ioctl, | |
315 | .mmap = snd_info_entry_mmap, | |
316 | .open = snd_info_entry_open, | |
317 | .release = snd_info_entry_release, | |
318 | }; | |
1da177e4 | 319 | |
4adb7bcb TI |
320 | /* |
321 | * file ops for text proc files | |
322 | */ | |
323 | static ssize_t snd_info_text_entry_write(struct file *file, | |
324 | const char __user *buffer, | |
325 | size_t count, loff_t *offset) | |
326 | { | |
327 | struct seq_file *m = file->private_data; | |
328 | struct snd_info_private_data *data = m->private; | |
329 | struct snd_info_entry *entry = data->entry; | |
330 | struct snd_info_buffer *buf; | |
331 | loff_t pos; | |
332 | size_t next; | |
333 | int err = 0; | |
334 | ||
335 | pos = *offset; | |
336 | if (!valid_pos(pos, count)) | |
337 | return -EIO; | |
338 | next = pos + count; | |
339 | mutex_lock(&entry->access); | |
340 | buf = data->wbuffer; | |
341 | if (!buf) { | |
342 | data->wbuffer = buf = kzalloc(sizeof(*buf), GFP_KERNEL); | |
343 | if (!buf) { | |
344 | err = -ENOMEM; | |
345 | goto error; | |
346 | } | |
1da177e4 | 347 | } |
4adb7bcb TI |
348 | if (next > buf->len) { |
349 | char *nbuf = krealloc(buf->buffer, PAGE_ALIGN(next), | |
350 | GFP_KERNEL | __GFP_ZERO); | |
351 | if (!nbuf) { | |
352 | err = -ENOMEM; | |
353 | goto error; | |
354 | } | |
355 | buf->buffer = nbuf; | |
356 | buf->len = PAGE_ALIGN(next); | |
357 | } | |
358 | if (copy_from_user(buf->buffer + pos, buffer, count)) { | |
359 | err = -EFAULT; | |
360 | goto error; | |
361 | } | |
362 | buf->size = next; | |
363 | error: | |
364 | mutex_unlock(&entry->access); | |
365 | if (err < 0) | |
366 | return err; | |
367 | *offset = next; | |
368 | return count; | |
1da177e4 LT |
369 | } |
370 | ||
4adb7bcb | 371 | static int snd_info_seq_show(struct seq_file *seq, void *p) |
1da177e4 | 372 | { |
4adb7bcb TI |
373 | struct snd_info_private_data *data = seq->private; |
374 | struct snd_info_entry *entry = data->entry; | |
1da177e4 | 375 | |
4adb7bcb TI |
376 | if (entry->c.text.read) { |
377 | data->rbuffer->buffer = (char *)seq; /* XXX hack! */ | |
378 | entry->c.text.read(entry, data->rbuffer); | |
1da177e4 | 379 | } |
4adb7bcb | 380 | return 0; |
1da177e4 LT |
381 | } |
382 | ||
4adb7bcb | 383 | static int snd_info_text_entry_open(struct inode *inode, struct file *file) |
1da177e4 | 384 | { |
4adb7bcb | 385 | struct snd_info_entry *entry = PDE_DATA(inode); |
24c1f931 | 386 | struct snd_info_private_data *data; |
4adb7bcb | 387 | int err; |
1da177e4 | 388 | |
4adb7bcb TI |
389 | mutex_lock(&info_mutex); |
390 | err = alloc_info_private(entry, &data); | |
391 | if (err < 0) | |
392 | goto unlock; | |
393 | ||
394 | data->rbuffer = kzalloc(sizeof(*data->rbuffer), GFP_KERNEL); | |
395 | if (!data->rbuffer) { | |
396 | err = -ENOMEM; | |
397 | goto error; | |
398 | } | |
399 | if (entry->size) | |
400 | err = single_open_size(file, snd_info_seq_show, data, | |
401 | entry->size); | |
402 | else | |
403 | err = single_open(file, snd_info_seq_show, data); | |
404 | if (err < 0) | |
405 | goto error; | |
406 | mutex_unlock(&info_mutex); | |
407 | return 0; | |
408 | ||
409 | error: | |
410 | kfree(data->rbuffer); | |
411 | kfree(data); | |
412 | module_put(entry->module); | |
413 | unlock: | |
414 | mutex_unlock(&info_mutex); | |
415 | return err; | |
416 | } | |
417 | ||
418 | static int snd_info_text_entry_release(struct inode *inode, struct file *file) | |
419 | { | |
420 | struct seq_file *m = file->private_data; | |
421 | struct snd_info_private_data *data = m->private; | |
422 | struct snd_info_entry *entry = data->entry; | |
423 | ||
424 | if (data->wbuffer && entry->c.text.write) | |
425 | entry->c.text.write(entry, data->wbuffer); | |
426 | ||
427 | single_release(inode, file); | |
428 | kfree(data->rbuffer); | |
429 | if (data->wbuffer) { | |
430 | kfree(data->wbuffer->buffer); | |
431 | kfree(data->wbuffer); | |
1da177e4 | 432 | } |
4adb7bcb TI |
433 | |
434 | module_put(entry->module); | |
435 | kfree(data); | |
436 | return 0; | |
1da177e4 LT |
437 | } |
438 | ||
4adb7bcb | 439 | static const struct file_operations snd_info_text_entry_ops = |
1da177e4 | 440 | { |
d99e9889 | 441 | .owner = THIS_MODULE, |
4adb7bcb TI |
442 | .open = snd_info_text_entry_open, |
443 | .release = snd_info_text_entry_release, | |
444 | .write = snd_info_text_entry_write, | |
445 | .llseek = seq_lseek, | |
446 | .read = seq_read, | |
1da177e4 LT |
447 | }; |
448 | ||
886364f6 TI |
449 | static struct snd_info_entry *create_subdir(struct module *mod, |
450 | const char *name) | |
451 | { | |
452 | struct snd_info_entry *entry; | |
453 | ||
454 | entry = snd_info_create_module_entry(mod, name, NULL); | |
455 | if (!entry) | |
456 | return NULL; | |
457 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
458 | if (snd_info_register(entry) < 0) { | |
459 | snd_info_free_entry(entry); | |
460 | return NULL; | |
461 | } | |
462 | return entry; | |
463 | } | |
464 | ||
1da177e4 LT |
465 | int __init snd_info_init(void) |
466 | { | |
467 | struct proc_dir_entry *p; | |
468 | ||
e55d92b9 | 469 | p = proc_mkdir("asound", NULL); |
1da177e4 LT |
470 | if (p == NULL) |
471 | return -ENOMEM; | |
472 | snd_proc_root = p; | |
473 | #ifdef CONFIG_SND_OSSEMUL | |
886364f6 TI |
474 | snd_oss_root = create_subdir(THIS_MODULE, "oss"); |
475 | if (!snd_oss_root) | |
476 | goto error; | |
1da177e4 | 477 | #endif |
8eeaa2f9 | 478 | #if IS_ENABLED(CONFIG_SND_SEQUENCER) |
886364f6 TI |
479 | snd_seq_root = create_subdir(THIS_MODULE, "seq"); |
480 | if (!snd_seq_root) | |
481 | goto error; | |
1da177e4 LT |
482 | #endif |
483 | snd_info_version_init(); | |
1da177e4 LT |
484 | snd_minor_info_init(); |
485 | snd_minor_info_oss_init(); | |
486 | snd_card_info_init(); | |
487 | return 0; | |
886364f6 TI |
488 | |
489 | error: | |
490 | #ifdef CONFIG_SND_OSSEMUL | |
491 | snd_info_free_entry(snd_oss_root); | |
492 | #endif | |
493 | proc_remove(snd_proc_root); | |
494 | return -ENOMEM; | |
1da177e4 LT |
495 | } |
496 | ||
497 | int __exit snd_info_done(void) | |
498 | { | |
499 | snd_card_info_done(); | |
500 | snd_minor_info_oss_done(); | |
501 | snd_minor_info_done(); | |
1da177e4 LT |
502 | snd_info_version_done(); |
503 | if (snd_proc_root) { | |
8eeaa2f9 | 504 | #if IS_ENABLED(CONFIG_SND_SEQUENCER) |
746d4a02 | 505 | snd_info_free_entry(snd_seq_root); |
1da177e4 LT |
506 | #endif |
507 | #ifdef CONFIG_SND_OSSEMUL | |
746d4a02 | 508 | snd_info_free_entry(snd_oss_root); |
1da177e4 | 509 | #endif |
a8ca16ea | 510 | proc_remove(snd_proc_root); |
1da177e4 LT |
511 | } |
512 | return 0; | |
513 | } | |
514 | ||
515 | /* | |
516 | ||
517 | */ | |
518 | ||
519 | ||
520 | /* | |
521 | * create a card proc file | |
522 | * called from init.c | |
523 | */ | |
24c1f931 | 524 | int snd_info_card_create(struct snd_card *card) |
1da177e4 LT |
525 | { |
526 | char str[8]; | |
24c1f931 | 527 | struct snd_info_entry *entry; |
1da177e4 | 528 | |
7eaa943c TI |
529 | if (snd_BUG_ON(!card)) |
530 | return -ENXIO; | |
1da177e4 LT |
531 | |
532 | sprintf(str, "card%i", card->number); | |
886364f6 TI |
533 | entry = create_subdir(card->module, str); |
534 | if (!entry) | |
1da177e4 | 535 | return -ENOMEM; |
1da177e4 LT |
536 | card->proc_root = entry; |
537 | return 0; | |
538 | } | |
539 | ||
540 | /* | |
541 | * register the card proc file | |
542 | * called from init.c | |
543 | */ | |
24c1f931 | 544 | int snd_info_card_register(struct snd_card *card) |
1da177e4 LT |
545 | { |
546 | struct proc_dir_entry *p; | |
547 | ||
7eaa943c TI |
548 | if (snd_BUG_ON(!card)) |
549 | return -ENXIO; | |
1da177e4 LT |
550 | |
551 | if (!strcmp(card->id, card->proc_root->name)) | |
552 | return 0; | |
553 | ||
554 | p = proc_symlink(card->id, snd_proc_root, card->proc_root->name); | |
555 | if (p == NULL) | |
556 | return -ENOMEM; | |
557 | card->proc_root_link = p; | |
558 | return 0; | |
559 | } | |
560 | ||
c2eb9c4e JK |
561 | /* |
562 | * called on card->id change | |
563 | */ | |
564 | void snd_info_card_id_change(struct snd_card *card) | |
565 | { | |
566 | mutex_lock(&info_mutex); | |
567 | if (card->proc_root_link) { | |
a8ca16ea | 568 | proc_remove(card->proc_root_link); |
c2eb9c4e JK |
569 | card->proc_root_link = NULL; |
570 | } | |
571 | if (strcmp(card->id, card->proc_root->name)) | |
572 | card->proc_root_link = proc_symlink(card->id, | |
573 | snd_proc_root, | |
574 | card->proc_root->name); | |
575 | mutex_unlock(&info_mutex); | |
576 | } | |
577 | ||
1da177e4 LT |
578 | /* |
579 | * de-register the card proc file | |
580 | * called from init.c | |
581 | */ | |
746d4a02 | 582 | void snd_info_card_disconnect(struct snd_card *card) |
1da177e4 | 583 | { |
7eaa943c TI |
584 | if (!card) |
585 | return; | |
746d4a02 | 586 | mutex_lock(&info_mutex); |
a8ca16ea DH |
587 | proc_remove(card->proc_root_link); |
588 | card->proc_root_link = NULL; | |
746d4a02 TI |
589 | if (card->proc_root) |
590 | snd_info_disconnect(card->proc_root); | |
591 | mutex_unlock(&info_mutex); | |
592 | } | |
593 | ||
594 | /* | |
595 | * release the card proc file resources | |
596 | * called from init.c | |
597 | */ | |
598 | int snd_info_card_free(struct snd_card *card) | |
599 | { | |
7eaa943c TI |
600 | if (!card) |
601 | return 0; | |
746d4a02 TI |
602 | snd_info_free_entry(card->proc_root); |
603 | card->proc_root = NULL; | |
1da177e4 LT |
604 | return 0; |
605 | } | |
606 | ||
607 | ||
608 | /** | |
609 | * snd_info_get_line - read one line from the procfs buffer | |
610 | * @buffer: the procfs buffer | |
611 | * @line: the buffer to store | |
ddc64b27 | 612 | * @len: the max. buffer size |
1da177e4 LT |
613 | * |
614 | * Reads one line from the buffer and stores the string. | |
615 | * | |
eb7c06e8 | 616 | * Return: Zero if successful, or 1 if error or EOF. |
1da177e4 | 617 | */ |
24c1f931 | 618 | int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) |
1da177e4 LT |
619 | { |
620 | int c = -1; | |
621 | ||
0bc0ec90 TI |
622 | if (snd_BUG_ON(!buffer || !buffer->buffer)) |
623 | return 1; | |
1da177e4 LT |
624 | if (len <= 0 || buffer->stop || buffer->error) |
625 | return 1; | |
0bc0ec90 | 626 | while (!buffer->stop) { |
7e4eeec8 | 627 | c = buffer->buffer[buffer->curr++]; |
0bc0ec90 | 628 | if (buffer->curr >= buffer->size) |
1da177e4 | 629 | buffer->stop = 1; |
0bc0ec90 | 630 | if (c == '\n') |
1da177e4 | 631 | break; |
ddc64b27 | 632 | if (len > 1) { |
0bc0ec90 TI |
633 | len--; |
634 | *line++ = c; | |
1da177e4 LT |
635 | } |
636 | } | |
1da177e4 LT |
637 | *line = '\0'; |
638 | return 0; | |
639 | } | |
640 | ||
c0d3fb39 TI |
641 | EXPORT_SYMBOL(snd_info_get_line); |
642 | ||
1da177e4 | 643 | /** |
856def8a | 644 | * snd_info_get_str - parse a string token |
1da177e4 LT |
645 | * @dest: the buffer to store the string token |
646 | * @src: the original string | |
647 | * @len: the max. length of token - 1 | |
648 | * | |
649 | * Parses the original string and copy a token to the given | |
650 | * string buffer. | |
651 | * | |
eb7c06e8 | 652 | * Return: The updated pointer of the original string so that |
1da177e4 LT |
653 | * it can be used for the next call. |
654 | */ | |
4f7454a9 | 655 | const char *snd_info_get_str(char *dest, const char *src, int len) |
1da177e4 LT |
656 | { |
657 | int c; | |
658 | ||
659 | while (*src == ' ' || *src == '\t') | |
660 | src++; | |
661 | if (*src == '"' || *src == '\'') { | |
662 | c = *src++; | |
663 | while (--len > 0 && *src && *src != c) { | |
664 | *dest++ = *src++; | |
665 | } | |
666 | if (*src == c) | |
667 | src++; | |
668 | } else { | |
669 | while (--len > 0 && *src && *src != ' ' && *src != '\t') { | |
670 | *dest++ = *src++; | |
671 | } | |
672 | } | |
673 | *dest = 0; | |
674 | while (*src == ' ' || *src == '\t') | |
675 | src++; | |
676 | return src; | |
677 | } | |
678 | ||
c0d3fb39 TI |
679 | EXPORT_SYMBOL(snd_info_get_str); |
680 | ||
1da177e4 LT |
681 | /** |
682 | * snd_info_create_entry - create an info entry | |
683 | * @name: the proc file name | |
684 | * | |
685 | * Creates an info entry with the given file name and initializes as | |
686 | * the default state. | |
687 | * | |
688 | * Usually called from other functions such as | |
689 | * snd_info_create_card_entry(). | |
690 | * | |
eb7c06e8 | 691 | * Return: The pointer of the new instance, or %NULL on failure. |
1da177e4 | 692 | */ |
24c1f931 | 693 | static struct snd_info_entry *snd_info_create_entry(const char *name) |
1da177e4 | 694 | { |
24c1f931 | 695 | struct snd_info_entry *entry; |
ca2c0966 | 696 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
1da177e4 LT |
697 | if (entry == NULL) |
698 | return NULL; | |
543537bd | 699 | entry->name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
700 | if (entry->name == NULL) { |
701 | kfree(entry); | |
702 | return NULL; | |
703 | } | |
704 | entry->mode = S_IFREG | S_IRUGO; | |
705 | entry->content = SNDRV_INFO_CONTENT_TEXT; | |
1a60d4c5 | 706 | mutex_init(&entry->access); |
746d4a02 TI |
707 | INIT_LIST_HEAD(&entry->children); |
708 | INIT_LIST_HEAD(&entry->list); | |
1da177e4 LT |
709 | return entry; |
710 | } | |
711 | ||
712 | /** | |
713 | * snd_info_create_module_entry - create an info entry for the given module | |
714 | * @module: the module pointer | |
715 | * @name: the file name | |
716 | * @parent: the parent directory | |
717 | * | |
718 | * Creates a new info entry and assigns it to the given module. | |
719 | * | |
eb7c06e8 | 720 | * Return: The pointer of the new instance, or %NULL on failure. |
1da177e4 | 721 | */ |
24c1f931 | 722 | struct snd_info_entry *snd_info_create_module_entry(struct module * module, |
1da177e4 | 723 | const char *name, |
24c1f931 | 724 | struct snd_info_entry *parent) |
1da177e4 | 725 | { |
24c1f931 | 726 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
727 | if (entry) { |
728 | entry->module = module; | |
729 | entry->parent = parent; | |
730 | } | |
731 | return entry; | |
732 | } | |
733 | ||
c0d3fb39 TI |
734 | EXPORT_SYMBOL(snd_info_create_module_entry); |
735 | ||
1da177e4 LT |
736 | /** |
737 | * snd_info_create_card_entry - create an info entry for the given card | |
738 | * @card: the card instance | |
739 | * @name: the file name | |
740 | * @parent: the parent directory | |
741 | * | |
742 | * Creates a new info entry and assigns it to the given card. | |
743 | * | |
eb7c06e8 | 744 | * Return: The pointer of the new instance, or %NULL on failure. |
1da177e4 | 745 | */ |
24c1f931 | 746 | struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, |
1da177e4 | 747 | const char *name, |
24c1f931 | 748 | struct snd_info_entry * parent) |
1da177e4 | 749 | { |
24c1f931 | 750 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
751 | if (entry) { |
752 | entry->module = card->module; | |
753 | entry->card = card; | |
754 | entry->parent = parent; | |
755 | } | |
756 | return entry; | |
757 | } | |
758 | ||
c0d3fb39 TI |
759 | EXPORT_SYMBOL(snd_info_create_card_entry); |
760 | ||
746d4a02 | 761 | static void snd_info_disconnect(struct snd_info_entry *entry) |
1da177e4 | 762 | { |
746d4a02 | 763 | struct list_head *p, *n; |
1da177e4 | 764 | |
746d4a02 TI |
765 | list_for_each_safe(p, n, &entry->children) { |
766 | snd_info_disconnect(list_entry(p, struct snd_info_entry, list)); | |
767 | } | |
768 | ||
769 | if (! entry->p) | |
770 | return; | |
771 | list_del_init(&entry->list); | |
a8ca16ea | 772 | proc_remove(entry->p); |
746d4a02 | 773 | entry->p = NULL; |
1da177e4 LT |
774 | } |
775 | ||
746d4a02 | 776 | static int snd_info_dev_free_entry(struct snd_device *device) |
1da177e4 | 777 | { |
24c1f931 | 778 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 779 | snd_info_free_entry(entry); |
1da177e4 LT |
780 | return 0; |
781 | } | |
782 | ||
746d4a02 | 783 | static int snd_info_dev_register_entry(struct snd_device *device) |
1da177e4 | 784 | { |
24c1f931 | 785 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 786 | return snd_info_register(entry); |
1da177e4 LT |
787 | } |
788 | ||
789 | /** | |
790 | * snd_card_proc_new - create an info entry for the given card | |
791 | * @card: the card instance | |
792 | * @name: the file name | |
793 | * @entryp: the pointer to store the new info entry | |
794 | * | |
795 | * Creates a new info entry and assigns it to the given card. | |
796 | * Unlike snd_info_create_card_entry(), this function registers the | |
797 | * info entry as an ALSA device component, so that it can be | |
798 | * unregistered/released without explicit call. | |
799 | * Also, you don't have to register this entry via snd_info_register(), | |
800 | * since this will be registered by snd_card_register() automatically. | |
801 | * | |
802 | * The parent is assumed as card->proc_root. | |
803 | * | |
804 | * For releasing this entry, use snd_device_free() instead of | |
805 | * snd_info_free_entry(). | |
806 | * | |
eb7c06e8 | 807 | * Return: Zero if successful, or a negative error code on failure. |
1da177e4 | 808 | */ |
24c1f931 TI |
809 | int snd_card_proc_new(struct snd_card *card, const char *name, |
810 | struct snd_info_entry **entryp) | |
1da177e4 | 811 | { |
24c1f931 | 812 | static struct snd_device_ops ops = { |
1da177e4 LT |
813 | .dev_free = snd_info_dev_free_entry, |
814 | .dev_register = snd_info_dev_register_entry, | |
746d4a02 | 815 | /* disconnect is done via snd_info_card_disconnect() */ |
1da177e4 | 816 | }; |
24c1f931 | 817 | struct snd_info_entry *entry; |
1da177e4 LT |
818 | int err; |
819 | ||
820 | entry = snd_info_create_card_entry(card, name, card->proc_root); | |
821 | if (! entry) | |
822 | return -ENOMEM; | |
823 | if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) { | |
824 | snd_info_free_entry(entry); | |
825 | return err; | |
826 | } | |
827 | if (entryp) | |
828 | *entryp = entry; | |
829 | return 0; | |
830 | } | |
831 | ||
c0d3fb39 TI |
832 | EXPORT_SYMBOL(snd_card_proc_new); |
833 | ||
1da177e4 LT |
834 | /** |
835 | * snd_info_free_entry - release the info entry | |
836 | * @entry: the info entry | |
837 | * | |
838 | * Releases the info entry. Don't call this after registered. | |
839 | */ | |
24c1f931 | 840 | void snd_info_free_entry(struct snd_info_entry * entry) |
1da177e4 LT |
841 | { |
842 | if (entry == NULL) | |
843 | return; | |
746d4a02 TI |
844 | if (entry->p) { |
845 | mutex_lock(&info_mutex); | |
846 | snd_info_disconnect(entry); | |
847 | mutex_unlock(&info_mutex); | |
848 | } | |
1da177e4 LT |
849 | kfree(entry->name); |
850 | if (entry->private_free) | |
851 | entry->private_free(entry); | |
852 | kfree(entry); | |
853 | } | |
854 | ||
c0d3fb39 TI |
855 | EXPORT_SYMBOL(snd_info_free_entry); |
856 | ||
1da177e4 LT |
857 | /** |
858 | * snd_info_register - register the info entry | |
859 | * @entry: the info entry | |
860 | * | |
861 | * Registers the proc info entry. | |
862 | * | |
eb7c06e8 | 863 | * Return: Zero if successful, or a negative error code on failure. |
1da177e4 | 864 | */ |
24c1f931 | 865 | int snd_info_register(struct snd_info_entry * entry) |
1da177e4 LT |
866 | { |
867 | struct proc_dir_entry *root, *p = NULL; | |
868 | ||
7eaa943c TI |
869 | if (snd_BUG_ON(!entry)) |
870 | return -ENXIO; | |
1da177e4 | 871 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; |
1a60d4c5 | 872 | mutex_lock(&info_mutex); |
aee0c612 AV |
873 | if (S_ISDIR(entry->mode)) { |
874 | p = proc_mkdir_mode(entry->name, entry->mode, root); | |
875 | if (!p) { | |
876 | mutex_unlock(&info_mutex); | |
877 | return -ENOMEM; | |
878 | } | |
879 | } else { | |
4adb7bcb TI |
880 | const struct file_operations *ops; |
881 | if (entry->content == SNDRV_INFO_CONTENT_DATA) | |
882 | ops = &snd_info_entry_operations; | |
883 | else | |
884 | ops = &snd_info_text_entry_ops; | |
aee0c612 | 885 | p = proc_create_data(entry->name, entry->mode, root, |
4adb7bcb | 886 | ops, entry); |
aee0c612 AV |
887 | if (!p) { |
888 | mutex_unlock(&info_mutex); | |
889 | return -ENOMEM; | |
890 | } | |
271a15ea | 891 | proc_set_size(p, entry->size); |
1da177e4 | 892 | } |
1da177e4 | 893 | entry->p = p; |
746d4a02 TI |
894 | if (entry->parent) |
895 | list_add_tail(&entry->list, &entry->parent->children); | |
1a60d4c5 | 896 | mutex_unlock(&info_mutex); |
1da177e4 LT |
897 | return 0; |
898 | } | |
899 | ||
c0d3fb39 TI |
900 | EXPORT_SYMBOL(snd_info_register); |
901 | ||
1da177e4 LT |
902 | /* |
903 | ||
904 | */ | |
905 | ||
6581f4e7 | 906 | static struct snd_info_entry *snd_info_version_entry; |
1da177e4 | 907 | |
24c1f931 | 908 | static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) |
1da177e4 LT |
909 | { |
910 | snd_iprintf(buffer, | |
42662748 JK |
911 | "Advanced Linux Sound Architecture Driver Version k%s.\n", |
912 | init_utsname()->release); | |
1da177e4 LT |
913 | } |
914 | ||
915 | static int __init snd_info_version_init(void) | |
916 | { | |
24c1f931 | 917 | struct snd_info_entry *entry; |
1da177e4 LT |
918 | |
919 | entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL); | |
920 | if (entry == NULL) | |
921 | return -ENOMEM; | |
1da177e4 LT |
922 | entry->c.text.read = snd_info_version_read; |
923 | if (snd_info_register(entry) < 0) { | |
924 | snd_info_free_entry(entry); | |
925 | return -ENOMEM; | |
926 | } | |
927 | snd_info_version_entry = entry; | |
928 | return 0; | |
929 | } | |
930 | ||
931 | static int __exit snd_info_version_done(void) | |
932 | { | |
746d4a02 | 933 | snd_info_free_entry(snd_info_version_entry); |
1da177e4 LT |
934 | return 0; |
935 | } | |
936 | ||
937 | #endif /* CONFIG_PROC_FS */ |