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 | ||
1da177e4 LT |
36 | int snd_info_check_reserved_words(const char *str) |
37 | { | |
38 | static char *reserved[] = | |
39 | { | |
40 | "version", | |
41 | "meminfo", | |
42 | "memdebug", | |
43 | "detect", | |
44 | "devices", | |
45 | "oss", | |
46 | "cards", | |
47 | "timers", | |
48 | "synth", | |
49 | "pcm", | |
50 | "seq", | |
51 | NULL | |
52 | }; | |
53 | char **xstr = reserved; | |
54 | ||
55 | while (*xstr) { | |
56 | if (!strcmp(*xstr, str)) | |
57 | return 0; | |
58 | xstr++; | |
59 | } | |
60 | if (!strncmp(str, "card", 4)) | |
61 | return 0; | |
62 | return 1; | |
63 | } | |
64 | ||
1a60d4c5 | 65 | static DEFINE_MUTEX(info_mutex); |
1da177e4 | 66 | |
24c1f931 TI |
67 | struct snd_info_private_data { |
68 | struct snd_info_buffer *rbuffer; | |
69 | struct snd_info_buffer *wbuffer; | |
70 | struct snd_info_entry *entry; | |
1da177e4 | 71 | void *file_private_data; |
24c1f931 | 72 | }; |
1da177e4 LT |
73 | |
74 | static int snd_info_version_init(void); | |
746d4a02 | 75 | static void snd_info_disconnect(struct snd_info_entry *entry); |
1da177e4 | 76 | |
1da177e4 LT |
77 | /* |
78 | ||
79 | */ | |
80 | ||
644dbd64 | 81 | static struct snd_info_entry *snd_proc_root; |
6581f4e7 | 82 | struct snd_info_entry *snd_seq_root; |
c0d3fb39 TI |
83 | EXPORT_SYMBOL(snd_seq_root); |
84 | ||
1da177e4 | 85 | #ifdef CONFIG_SND_OSSEMUL |
6581f4e7 | 86 | struct snd_info_entry *snd_oss_root; |
1da177e4 LT |
87 | #endif |
88 | ||
4adb7bcb TI |
89 | static int alloc_info_private(struct snd_info_entry *entry, |
90 | struct snd_info_private_data **ret) | |
91 | { | |
92 | struct snd_info_private_data *data; | |
93 | ||
94 | if (!entry || !entry->p) | |
95 | return -ENODEV; | |
96 | if (!try_module_get(entry->module)) | |
97 | return -EFAULT; | |
98 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
99 | if (!data) { | |
100 | module_put(entry->module); | |
101 | return -ENOMEM; | |
102 | } | |
103 | data->entry = entry; | |
104 | *ret = data; | |
105 | return 0; | |
106 | } | |
107 | ||
108 | static bool valid_pos(loff_t pos, size_t count) | |
109 | { | |
110 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
111 | return false; | |
112 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
113 | return false; | |
114 | return true; | |
115 | } | |
116 | ||
117 | /* | |
118 | * file ops for binary proc files | |
119 | */ | |
1da177e4 LT |
120 | static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig) |
121 | { | |
24c1f931 | 122 | struct snd_info_private_data *data; |
1da177e4 | 123 | struct snd_info_entry *entry; |
73029e0f | 124 | loff_t ret = -EINVAL, size; |
1da177e4 LT |
125 | |
126 | data = file->private_data; | |
127 | entry = data->entry; | |
5b5cd553 | 128 | mutex_lock(&entry->access); |
4adb7bcb | 129 | if (entry->c.ops->llseek) { |
73029e0f TI |
130 | offset = entry->c.ops->llseek(entry, |
131 | data->file_private_data, | |
132 | file, offset, orig); | |
133 | goto out; | |
134 | } | |
4adb7bcb TI |
135 | |
136 | size = entry->size; | |
73029e0f TI |
137 | switch (orig) { |
138 | case SEEK_SET: | |
139 | break; | |
140 | case SEEK_CUR: | |
141 | offset += file->f_pos; | |
1da177e4 | 142 | break; |
73029e0f TI |
143 | case SEEK_END: |
144 | if (!size) | |
1da177e4 | 145 | goto out; |
73029e0f | 146 | offset += size; |
1da177e4 | 147 | break; |
73029e0f TI |
148 | default: |
149 | goto out; | |
1da177e4 | 150 | } |
73029e0f TI |
151 | if (offset < 0) |
152 | goto out; | |
153 | if (size && offset > size) | |
154 | offset = size; | |
155 | file->f_pos = offset; | |
156 | ret = offset; | |
157 | out: | |
5b5cd553 | 158 | mutex_unlock(&entry->access); |
1da177e4 LT |
159 | return ret; |
160 | } | |
161 | ||
162 | static ssize_t snd_info_entry_read(struct file *file, char __user *buffer, | |
163 | size_t count, loff_t * offset) | |
164 | { | |
4adb7bcb TI |
165 | struct snd_info_private_data *data = file->private_data; |
166 | struct snd_info_entry *entry = data->entry; | |
167 | size_t size; | |
1da177e4 LT |
168 | loff_t pos; |
169 | ||
1da177e4 | 170 | pos = *offset; |
4adb7bcb | 171 | if (!valid_pos(pos, count)) |
1da177e4 | 172 | return -EIO; |
4adb7bcb TI |
173 | if (pos >= entry->size) |
174 | return 0; | |
175 | size = entry->size - pos; | |
176 | size = min(count, size); | |
177 | size = entry->c.ops->read(entry, data->file_private_data, | |
178 | file, buffer, size, pos); | |
1da177e4 LT |
179 | if ((ssize_t) size > 0) |
180 | *offset = pos + size; | |
181 | return size; | |
182 | } | |
183 | ||
184 | static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer, | |
185 | size_t count, loff_t * offset) | |
186 | { | |
4adb7bcb TI |
187 | struct snd_info_private_data *data = file->private_data; |
188 | struct snd_info_entry *entry = data->entry; | |
7e4eeec8 | 189 | ssize_t size = 0; |
1da177e4 LT |
190 | loff_t pos; |
191 | ||
1da177e4 | 192 | pos = *offset; |
4adb7bcb | 193 | if (!valid_pos(pos, count)) |
1da177e4 | 194 | return -EIO; |
4adb7bcb TI |
195 | if (count > 0) { |
196 | size_t maxsize = entry->size - pos; | |
197 | count = min(count, maxsize); | |
198 | size = entry->c.ops->write(entry, data->file_private_data, | |
199 | file, buffer, count, pos); | |
1da177e4 | 200 | } |
4adb7bcb | 201 | if (size > 0) |
1da177e4 LT |
202 | *offset = pos + size; |
203 | return size; | |
204 | } | |
205 | ||
4adb7bcb TI |
206 | static unsigned int snd_info_entry_poll(struct file *file, poll_table *wait) |
207 | { | |
208 | struct snd_info_private_data *data = file->private_data; | |
209 | struct snd_info_entry *entry = data->entry; | |
210 | unsigned int mask = 0; | |
211 | ||
212 | if (entry->c.ops->poll) | |
213 | return entry->c.ops->poll(entry, | |
214 | data->file_private_data, | |
215 | file, wait); | |
216 | if (entry->c.ops->read) | |
217 | mask |= POLLIN | POLLRDNORM; | |
218 | if (entry->c.ops->write) | |
219 | mask |= POLLOUT | POLLWRNORM; | |
220 | return mask; | |
221 | } | |
222 | ||
223 | static long snd_info_entry_ioctl(struct file *file, unsigned int cmd, | |
224 | unsigned long arg) | |
225 | { | |
226 | struct snd_info_private_data *data = file->private_data; | |
227 | struct snd_info_entry *entry = data->entry; | |
228 | ||
229 | if (!entry->c.ops->ioctl) | |
230 | return -ENOTTY; | |
231 | return entry->c.ops->ioctl(entry, data->file_private_data, | |
232 | file, cmd, arg); | |
233 | } | |
234 | ||
235 | static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma) | |
1da177e4 | 236 | { |
4adb7bcb TI |
237 | struct inode *inode = file_inode(file); |
238 | struct snd_info_private_data *data; | |
24c1f931 | 239 | struct snd_info_entry *entry; |
4adb7bcb TI |
240 | |
241 | data = file->private_data; | |
242 | if (data == NULL) | |
243 | return 0; | |
244 | entry = data->entry; | |
245 | if (!entry->c.ops->mmap) | |
246 | return -ENXIO; | |
247 | return entry->c.ops->mmap(entry, data->file_private_data, | |
248 | inode, file, vma); | |
249 | } | |
250 | ||
251 | static int snd_info_entry_open(struct inode *inode, struct file *file) | |
252 | { | |
253 | struct snd_info_entry *entry = PDE_DATA(inode); | |
24c1f931 | 254 | struct snd_info_private_data *data; |
1da177e4 LT |
255 | int mode, err; |
256 | ||
1a60d4c5 | 257 | mutex_lock(&info_mutex); |
4adb7bcb TI |
258 | err = alloc_info_private(entry, &data); |
259 | if (err < 0) | |
260 | goto unlock; | |
261 | ||
1da177e4 | 262 | mode = file->f_flags & O_ACCMODE; |
4adb7bcb TI |
263 | if (((mode == O_RDONLY || mode == O_RDWR) && !entry->c.ops->read) || |
264 | ((mode == O_WRONLY || mode == O_RDWR) && !entry->c.ops->write)) { | |
265 | err = -ENODEV; | |
266 | goto error; | |
1da177e4 | 267 | } |
4adb7bcb TI |
268 | |
269 | if (entry->c.ops->open) { | |
270 | err = entry->c.ops->open(entry, mode, &data->file_private_data); | |
271 | if (err < 0) | |
272 | goto error; | |
1da177e4 | 273 | } |
4adb7bcb | 274 | |
1da177e4 | 275 | file->private_data = data; |
1a60d4c5 | 276 | mutex_unlock(&info_mutex); |
1da177e4 LT |
277 | return 0; |
278 | ||
4adb7bcb | 279 | error: |
7e4eeec8 | 280 | kfree(data); |
1da177e4 | 281 | module_put(entry->module); |
4adb7bcb | 282 | unlock: |
1a60d4c5 | 283 | mutex_unlock(&info_mutex); |
1da177e4 LT |
284 | return err; |
285 | } | |
286 | ||
287 | static int snd_info_entry_release(struct inode *inode, struct file *file) | |
288 | { | |
4adb7bcb TI |
289 | struct snd_info_private_data *data = file->private_data; |
290 | struct snd_info_entry *entry = data->entry; | |
1da177e4 | 291 | |
4adb7bcb TI |
292 | if (entry->c.ops->release) |
293 | entry->c.ops->release(entry, file->f_flags & O_ACCMODE, | |
294 | data->file_private_data); | |
1da177e4 LT |
295 | module_put(entry->module); |
296 | kfree(data); | |
297 | return 0; | |
298 | } | |
299 | ||
4adb7bcb | 300 | static const struct file_operations snd_info_entry_operations = |
1da177e4 | 301 | { |
4adb7bcb TI |
302 | .owner = THIS_MODULE, |
303 | .llseek = snd_info_entry_llseek, | |
304 | .read = snd_info_entry_read, | |
305 | .write = snd_info_entry_write, | |
306 | .poll = snd_info_entry_poll, | |
307 | .unlocked_ioctl = snd_info_entry_ioctl, | |
308 | .mmap = snd_info_entry_mmap, | |
309 | .open = snd_info_entry_open, | |
310 | .release = snd_info_entry_release, | |
311 | }; | |
1da177e4 | 312 | |
4adb7bcb TI |
313 | /* |
314 | * file ops for text proc files | |
315 | */ | |
316 | static ssize_t snd_info_text_entry_write(struct file *file, | |
317 | const char __user *buffer, | |
318 | size_t count, loff_t *offset) | |
319 | { | |
320 | struct seq_file *m = file->private_data; | |
321 | struct snd_info_private_data *data = m->private; | |
322 | struct snd_info_entry *entry = data->entry; | |
323 | struct snd_info_buffer *buf; | |
324 | loff_t pos; | |
325 | size_t next; | |
326 | int err = 0; | |
327 | ||
328 | pos = *offset; | |
329 | if (!valid_pos(pos, count)) | |
330 | return -EIO; | |
331 | next = pos + count; | |
332 | mutex_lock(&entry->access); | |
333 | buf = data->wbuffer; | |
334 | if (!buf) { | |
335 | data->wbuffer = buf = kzalloc(sizeof(*buf), GFP_KERNEL); | |
336 | if (!buf) { | |
337 | err = -ENOMEM; | |
338 | goto error; | |
339 | } | |
1da177e4 | 340 | } |
4adb7bcb TI |
341 | if (next > buf->len) { |
342 | char *nbuf = krealloc(buf->buffer, PAGE_ALIGN(next), | |
343 | GFP_KERNEL | __GFP_ZERO); | |
344 | if (!nbuf) { | |
345 | err = -ENOMEM; | |
346 | goto error; | |
347 | } | |
348 | buf->buffer = nbuf; | |
349 | buf->len = PAGE_ALIGN(next); | |
350 | } | |
351 | if (copy_from_user(buf->buffer + pos, buffer, count)) { | |
352 | err = -EFAULT; | |
353 | goto error; | |
354 | } | |
355 | buf->size = next; | |
356 | error: | |
357 | mutex_unlock(&entry->access); | |
358 | if (err < 0) | |
359 | return err; | |
360 | *offset = next; | |
361 | return count; | |
1da177e4 LT |
362 | } |
363 | ||
4adb7bcb | 364 | static int snd_info_seq_show(struct seq_file *seq, void *p) |
1da177e4 | 365 | { |
4adb7bcb TI |
366 | struct snd_info_private_data *data = seq->private; |
367 | struct snd_info_entry *entry = data->entry; | |
1da177e4 | 368 | |
4adb7bcb TI |
369 | if (entry->c.text.read) { |
370 | data->rbuffer->buffer = (char *)seq; /* XXX hack! */ | |
371 | entry->c.text.read(entry, data->rbuffer); | |
1da177e4 | 372 | } |
4adb7bcb | 373 | return 0; |
1da177e4 LT |
374 | } |
375 | ||
4adb7bcb | 376 | static int snd_info_text_entry_open(struct inode *inode, struct file *file) |
1da177e4 | 377 | { |
4adb7bcb | 378 | struct snd_info_entry *entry = PDE_DATA(inode); |
24c1f931 | 379 | struct snd_info_private_data *data; |
4adb7bcb | 380 | int err; |
1da177e4 | 381 | |
4adb7bcb TI |
382 | mutex_lock(&info_mutex); |
383 | err = alloc_info_private(entry, &data); | |
384 | if (err < 0) | |
385 | goto unlock; | |
386 | ||
387 | data->rbuffer = kzalloc(sizeof(*data->rbuffer), GFP_KERNEL); | |
388 | if (!data->rbuffer) { | |
389 | err = -ENOMEM; | |
390 | goto error; | |
391 | } | |
392 | if (entry->size) | |
393 | err = single_open_size(file, snd_info_seq_show, data, | |
394 | entry->size); | |
395 | else | |
396 | err = single_open(file, snd_info_seq_show, data); | |
397 | if (err < 0) | |
398 | goto error; | |
399 | mutex_unlock(&info_mutex); | |
400 | return 0; | |
401 | ||
402 | error: | |
403 | kfree(data->rbuffer); | |
404 | kfree(data); | |
405 | module_put(entry->module); | |
406 | unlock: | |
407 | mutex_unlock(&info_mutex); | |
408 | return err; | |
409 | } | |
410 | ||
411 | static int snd_info_text_entry_release(struct inode *inode, struct file *file) | |
412 | { | |
413 | struct seq_file *m = file->private_data; | |
414 | struct snd_info_private_data *data = m->private; | |
415 | struct snd_info_entry *entry = data->entry; | |
416 | ||
417 | if (data->wbuffer && entry->c.text.write) | |
418 | entry->c.text.write(entry, data->wbuffer); | |
419 | ||
420 | single_release(inode, file); | |
421 | kfree(data->rbuffer); | |
422 | if (data->wbuffer) { | |
423 | kfree(data->wbuffer->buffer); | |
424 | kfree(data->wbuffer); | |
1da177e4 | 425 | } |
4adb7bcb TI |
426 | |
427 | module_put(entry->module); | |
428 | kfree(data); | |
429 | return 0; | |
1da177e4 LT |
430 | } |
431 | ||
4adb7bcb | 432 | static const struct file_operations snd_info_text_entry_ops = |
1da177e4 | 433 | { |
d99e9889 | 434 | .owner = THIS_MODULE, |
4adb7bcb TI |
435 | .open = snd_info_text_entry_open, |
436 | .release = snd_info_text_entry_release, | |
437 | .write = snd_info_text_entry_write, | |
438 | .llseek = seq_lseek, | |
439 | .read = seq_read, | |
1da177e4 LT |
440 | }; |
441 | ||
886364f6 TI |
442 | static struct snd_info_entry *create_subdir(struct module *mod, |
443 | const char *name) | |
444 | { | |
445 | struct snd_info_entry *entry; | |
446 | ||
447 | entry = snd_info_create_module_entry(mod, name, NULL); | |
448 | if (!entry) | |
449 | return NULL; | |
450 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
451 | if (snd_info_register(entry) < 0) { | |
452 | snd_info_free_entry(entry); | |
453 | return NULL; | |
454 | } | |
455 | return entry; | |
456 | } | |
457 | ||
8e7ccb7b TI |
458 | static struct snd_info_entry * |
459 | snd_info_create_entry(const char *name, struct snd_info_entry *parent); | |
644dbd64 | 460 | |
1da177e4 LT |
461 | int __init snd_info_init(void) |
462 | { | |
8e7ccb7b | 463 | snd_proc_root = snd_info_create_entry("asound", NULL); |
644dbd64 | 464 | if (!snd_proc_root) |
1da177e4 | 465 | return -ENOMEM; |
644dbd64 TI |
466 | snd_proc_root->mode = S_IFDIR | S_IRUGO | S_IXUGO; |
467 | snd_proc_root->p = proc_mkdir("asound", NULL); | |
468 | if (!snd_proc_root->p) | |
469 | goto error; | |
1da177e4 | 470 | #ifdef CONFIG_SND_OSSEMUL |
886364f6 TI |
471 | snd_oss_root = create_subdir(THIS_MODULE, "oss"); |
472 | if (!snd_oss_root) | |
473 | goto error; | |
1da177e4 | 474 | #endif |
8eeaa2f9 | 475 | #if IS_ENABLED(CONFIG_SND_SEQUENCER) |
886364f6 TI |
476 | snd_seq_root = create_subdir(THIS_MODULE, "seq"); |
477 | if (!snd_seq_root) | |
478 | goto error; | |
1da177e4 | 479 | #endif |
b591b6e9 TI |
480 | if (snd_info_version_init() < 0 || |
481 | snd_minor_info_init() < 0 || | |
482 | snd_minor_info_oss_init() < 0 || | |
a0dca822 TI |
483 | snd_card_info_init() < 0 || |
484 | snd_info_minor_register() < 0) | |
b591b6e9 | 485 | goto error; |
1da177e4 | 486 | return 0; |
886364f6 TI |
487 | |
488 | error: | |
644dbd64 | 489 | snd_info_free_entry(snd_proc_root); |
886364f6 | 490 | return -ENOMEM; |
1da177e4 LT |
491 | } |
492 | ||
493 | int __exit snd_info_done(void) | |
494 | { | |
644dbd64 | 495 | snd_info_free_entry(snd_proc_root); |
1da177e4 LT |
496 | return 0; |
497 | } | |
498 | ||
1da177e4 LT |
499 | /* |
500 | * create a card proc file | |
501 | * called from init.c | |
502 | */ | |
24c1f931 | 503 | int snd_info_card_create(struct snd_card *card) |
1da177e4 LT |
504 | { |
505 | char str[8]; | |
24c1f931 | 506 | struct snd_info_entry *entry; |
1da177e4 | 507 | |
7eaa943c TI |
508 | if (snd_BUG_ON(!card)) |
509 | return -ENXIO; | |
1da177e4 LT |
510 | |
511 | sprintf(str, "card%i", card->number); | |
886364f6 TI |
512 | entry = create_subdir(card->module, str); |
513 | if (!entry) | |
1da177e4 | 514 | return -ENOMEM; |
1da177e4 LT |
515 | card->proc_root = entry; |
516 | return 0; | |
517 | } | |
518 | ||
2471b6c8 TI |
519 | /* register all pending info entries */ |
520 | static int snd_info_register_recursive(struct snd_info_entry *entry) | |
521 | { | |
522 | struct snd_info_entry *p; | |
523 | int err; | |
524 | ||
525 | if (!entry->p) { | |
526 | err = snd_info_register(entry); | |
527 | if (err < 0) | |
528 | return err; | |
529 | } | |
530 | ||
531 | list_for_each_entry(p, &entry->children, list) { | |
532 | err = snd_info_register_recursive(p); | |
533 | if (err < 0) | |
534 | return err; | |
535 | } | |
536 | ||
537 | return 0; | |
538 | } | |
539 | ||
1da177e4 LT |
540 | /* |
541 | * register the card proc file | |
542 | * called from init.c | |
2471b6c8 | 543 | * can be called multiple times for reinitialization |
1da177e4 | 544 | */ |
24c1f931 | 545 | int snd_info_card_register(struct snd_card *card) |
1da177e4 LT |
546 | { |
547 | struct proc_dir_entry *p; | |
2471b6c8 | 548 | int err; |
1da177e4 | 549 | |
7eaa943c TI |
550 | if (snd_BUG_ON(!card)) |
551 | return -ENXIO; | |
1da177e4 | 552 | |
2471b6c8 TI |
553 | err = snd_info_register_recursive(card->proc_root); |
554 | if (err < 0) | |
555 | return err; | |
556 | ||
1da177e4 LT |
557 | if (!strcmp(card->id, card->proc_root->name)) |
558 | return 0; | |
559 | ||
2471b6c8 TI |
560 | if (card->proc_root_link) |
561 | return 0; | |
644dbd64 | 562 | p = proc_symlink(card->id, snd_proc_root->p, card->proc_root->name); |
2471b6c8 | 563 | if (!p) |
1da177e4 LT |
564 | return -ENOMEM; |
565 | card->proc_root_link = p; | |
566 | return 0; | |
567 | } | |
568 | ||
c2eb9c4e JK |
569 | /* |
570 | * called on card->id change | |
571 | */ | |
572 | void snd_info_card_id_change(struct snd_card *card) | |
573 | { | |
574 | mutex_lock(&info_mutex); | |
575 | if (card->proc_root_link) { | |
a8ca16ea | 576 | proc_remove(card->proc_root_link); |
c2eb9c4e JK |
577 | card->proc_root_link = NULL; |
578 | } | |
579 | if (strcmp(card->id, card->proc_root->name)) | |
580 | card->proc_root_link = proc_symlink(card->id, | |
644dbd64 | 581 | snd_proc_root->p, |
c2eb9c4e JK |
582 | card->proc_root->name); |
583 | mutex_unlock(&info_mutex); | |
584 | } | |
585 | ||
1da177e4 LT |
586 | /* |
587 | * de-register the card proc file | |
588 | * called from init.c | |
589 | */ | |
746d4a02 | 590 | void snd_info_card_disconnect(struct snd_card *card) |
1da177e4 | 591 | { |
7eaa943c TI |
592 | if (!card) |
593 | return; | |
746d4a02 | 594 | mutex_lock(&info_mutex); |
a8ca16ea DH |
595 | proc_remove(card->proc_root_link); |
596 | card->proc_root_link = NULL; | |
746d4a02 TI |
597 | if (card->proc_root) |
598 | snd_info_disconnect(card->proc_root); | |
599 | mutex_unlock(&info_mutex); | |
600 | } | |
601 | ||
602 | /* | |
603 | * release the card proc file resources | |
604 | * called from init.c | |
605 | */ | |
606 | int snd_info_card_free(struct snd_card *card) | |
607 | { | |
7eaa943c TI |
608 | if (!card) |
609 | return 0; | |
746d4a02 TI |
610 | snd_info_free_entry(card->proc_root); |
611 | card->proc_root = NULL; | |
1da177e4 LT |
612 | return 0; |
613 | } | |
614 | ||
615 | ||
616 | /** | |
617 | * snd_info_get_line - read one line from the procfs buffer | |
618 | * @buffer: the procfs buffer | |
619 | * @line: the buffer to store | |
ddc64b27 | 620 | * @len: the max. buffer size |
1da177e4 LT |
621 | * |
622 | * Reads one line from the buffer and stores the string. | |
623 | * | |
eb7c06e8 | 624 | * Return: Zero if successful, or 1 if error or EOF. |
1da177e4 | 625 | */ |
24c1f931 | 626 | int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) |
1da177e4 LT |
627 | { |
628 | int c = -1; | |
629 | ||
0bc0ec90 TI |
630 | if (snd_BUG_ON(!buffer || !buffer->buffer)) |
631 | return 1; | |
1da177e4 LT |
632 | if (len <= 0 || buffer->stop || buffer->error) |
633 | return 1; | |
0bc0ec90 | 634 | while (!buffer->stop) { |
7e4eeec8 | 635 | c = buffer->buffer[buffer->curr++]; |
0bc0ec90 | 636 | if (buffer->curr >= buffer->size) |
1da177e4 | 637 | buffer->stop = 1; |
0bc0ec90 | 638 | if (c == '\n') |
1da177e4 | 639 | break; |
ddc64b27 | 640 | if (len > 1) { |
0bc0ec90 TI |
641 | len--; |
642 | *line++ = c; | |
1da177e4 LT |
643 | } |
644 | } | |
1da177e4 LT |
645 | *line = '\0'; |
646 | return 0; | |
647 | } | |
648 | ||
c0d3fb39 TI |
649 | EXPORT_SYMBOL(snd_info_get_line); |
650 | ||
1da177e4 | 651 | /** |
856def8a | 652 | * snd_info_get_str - parse a string token |
1da177e4 LT |
653 | * @dest: the buffer to store the string token |
654 | * @src: the original string | |
655 | * @len: the max. length of token - 1 | |
656 | * | |
657 | * Parses the original string and copy a token to the given | |
658 | * string buffer. | |
659 | * | |
eb7c06e8 | 660 | * Return: The updated pointer of the original string so that |
1da177e4 LT |
661 | * it can be used for the next call. |
662 | */ | |
4f7454a9 | 663 | const char *snd_info_get_str(char *dest, const char *src, int len) |
1da177e4 LT |
664 | { |
665 | int c; | |
666 | ||
667 | while (*src == ' ' || *src == '\t') | |
668 | src++; | |
669 | if (*src == '"' || *src == '\'') { | |
670 | c = *src++; | |
671 | while (--len > 0 && *src && *src != c) { | |
672 | *dest++ = *src++; | |
673 | } | |
674 | if (*src == c) | |
675 | src++; | |
676 | } else { | |
677 | while (--len > 0 && *src && *src != ' ' && *src != '\t') { | |
678 | *dest++ = *src++; | |
679 | } | |
680 | } | |
681 | *dest = 0; | |
682 | while (*src == ' ' || *src == '\t') | |
683 | src++; | |
684 | return src; | |
685 | } | |
686 | ||
c0d3fb39 TI |
687 | EXPORT_SYMBOL(snd_info_get_str); |
688 | ||
c309c467 | 689 | /* |
1da177e4 LT |
690 | * snd_info_create_entry - create an info entry |
691 | * @name: the proc file name | |
8e7ccb7b | 692 | * @parent: the parent directory |
1da177e4 LT |
693 | * |
694 | * Creates an info entry with the given file name and initializes as | |
695 | * the default state. | |
696 | * | |
697 | * Usually called from other functions such as | |
698 | * snd_info_create_card_entry(). | |
699 | * | |
eb7c06e8 | 700 | * Return: The pointer of the new instance, or %NULL on failure. |
1da177e4 | 701 | */ |
8e7ccb7b TI |
702 | static struct snd_info_entry * |
703 | snd_info_create_entry(const char *name, struct snd_info_entry *parent) | |
1da177e4 | 704 | { |
24c1f931 | 705 | struct snd_info_entry *entry; |
ca2c0966 | 706 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
1da177e4 LT |
707 | if (entry == NULL) |
708 | return NULL; | |
543537bd | 709 | entry->name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
710 | if (entry->name == NULL) { |
711 | kfree(entry); | |
712 | return NULL; | |
713 | } | |
714 | entry->mode = S_IFREG | S_IRUGO; | |
715 | entry->content = SNDRV_INFO_CONTENT_TEXT; | |
1a60d4c5 | 716 | mutex_init(&entry->access); |
746d4a02 TI |
717 | INIT_LIST_HEAD(&entry->children); |
718 | INIT_LIST_HEAD(&entry->list); | |
8e7ccb7b TI |
719 | entry->parent = parent; |
720 | if (parent) | |
721 | list_add_tail(&entry->list, &parent->children); | |
1da177e4 LT |
722 | return entry; |
723 | } | |
724 | ||
725 | /** | |
726 | * snd_info_create_module_entry - create an info entry for the given module | |
727 | * @module: the module pointer | |
728 | * @name: the file name | |
729 | * @parent: the parent directory | |
730 | * | |
731 | * Creates a new info entry and assigns it to the given module. | |
732 | * | |
eb7c06e8 | 733 | * Return: The pointer of the new instance, or %NULL on failure. |
1da177e4 | 734 | */ |
24c1f931 | 735 | struct snd_info_entry *snd_info_create_module_entry(struct module * module, |
1da177e4 | 736 | const char *name, |
24c1f931 | 737 | struct snd_info_entry *parent) |
1da177e4 | 738 | { |
8e7ccb7b TI |
739 | struct snd_info_entry *entry = snd_info_create_entry(name, parent); |
740 | if (entry) | |
1da177e4 | 741 | entry->module = module; |
1da177e4 LT |
742 | return entry; |
743 | } | |
744 | ||
c0d3fb39 TI |
745 | EXPORT_SYMBOL(snd_info_create_module_entry); |
746 | ||
1da177e4 LT |
747 | /** |
748 | * snd_info_create_card_entry - create an info entry for the given card | |
749 | * @card: the card instance | |
750 | * @name: the file name | |
751 | * @parent: the parent directory | |
752 | * | |
753 | * Creates a new info entry and assigns it to the given card. | |
754 | * | |
eb7c06e8 | 755 | * Return: The pointer of the new instance, or %NULL on failure. |
1da177e4 | 756 | */ |
24c1f931 | 757 | struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, |
1da177e4 | 758 | const char *name, |
24c1f931 | 759 | struct snd_info_entry * parent) |
1da177e4 | 760 | { |
8e7ccb7b | 761 | struct snd_info_entry *entry = snd_info_create_entry(name, parent); |
1da177e4 LT |
762 | if (entry) { |
763 | entry->module = card->module; | |
764 | entry->card = card; | |
1da177e4 LT |
765 | } |
766 | return entry; | |
767 | } | |
768 | ||
c0d3fb39 TI |
769 | EXPORT_SYMBOL(snd_info_create_card_entry); |
770 | ||
746d4a02 | 771 | static void snd_info_disconnect(struct snd_info_entry *entry) |
1da177e4 | 772 | { |
90a409aa | 773 | struct snd_info_entry *p; |
1da177e4 | 774 | |
c560a679 | 775 | if (!entry->p) |
746d4a02 | 776 | return; |
90a409aa | 777 | list_for_each_entry(p, &entry->children, list) |
c560a679 | 778 | snd_info_disconnect(p); |
a8ca16ea | 779 | proc_remove(entry->p); |
746d4a02 | 780 | entry->p = NULL; |
1da177e4 LT |
781 | } |
782 | ||
1da177e4 LT |
783 | /** |
784 | * snd_info_free_entry - release the info entry | |
785 | * @entry: the info entry | |
786 | * | |
c560a679 | 787 | * Releases the info entry. |
1da177e4 | 788 | */ |
24c1f931 | 789 | void snd_info_free_entry(struct snd_info_entry * entry) |
1da177e4 | 790 | { |
c560a679 TI |
791 | struct snd_info_entry *p, *n; |
792 | ||
793 | if (!entry) | |
1da177e4 | 794 | return; |
746d4a02 TI |
795 | if (entry->p) { |
796 | mutex_lock(&info_mutex); | |
797 | snd_info_disconnect(entry); | |
798 | mutex_unlock(&info_mutex); | |
799 | } | |
c560a679 TI |
800 | |
801 | /* free all children at first */ | |
802 | list_for_each_entry_safe(p, n, &entry->children, list) | |
803 | snd_info_free_entry(p); | |
804 | ||
90a409aa | 805 | list_del(&entry->list); |
1da177e4 LT |
806 | kfree(entry->name); |
807 | if (entry->private_free) | |
808 | entry->private_free(entry); | |
809 | kfree(entry); | |
810 | } | |
811 | ||
c0d3fb39 TI |
812 | EXPORT_SYMBOL(snd_info_free_entry); |
813 | ||
1da177e4 LT |
814 | /** |
815 | * snd_info_register - register the info entry | |
816 | * @entry: the info entry | |
817 | * | |
818 | * Registers the proc info entry. | |
819 | * | |
eb7c06e8 | 820 | * Return: Zero if successful, or a negative error code on failure. |
1da177e4 | 821 | */ |
24c1f931 | 822 | int snd_info_register(struct snd_info_entry * entry) |
1da177e4 LT |
823 | { |
824 | struct proc_dir_entry *root, *p = NULL; | |
825 | ||
7eaa943c TI |
826 | if (snd_BUG_ON(!entry)) |
827 | return -ENXIO; | |
644dbd64 | 828 | root = entry->parent == NULL ? snd_proc_root->p : entry->parent->p; |
1a60d4c5 | 829 | mutex_lock(&info_mutex); |
aee0c612 AV |
830 | if (S_ISDIR(entry->mode)) { |
831 | p = proc_mkdir_mode(entry->name, entry->mode, root); | |
832 | if (!p) { | |
833 | mutex_unlock(&info_mutex); | |
834 | return -ENOMEM; | |
835 | } | |
836 | } else { | |
4adb7bcb TI |
837 | const struct file_operations *ops; |
838 | if (entry->content == SNDRV_INFO_CONTENT_DATA) | |
839 | ops = &snd_info_entry_operations; | |
840 | else | |
841 | ops = &snd_info_text_entry_ops; | |
aee0c612 | 842 | p = proc_create_data(entry->name, entry->mode, root, |
4adb7bcb | 843 | ops, entry); |
aee0c612 AV |
844 | if (!p) { |
845 | mutex_unlock(&info_mutex); | |
846 | return -ENOMEM; | |
847 | } | |
271a15ea | 848 | proc_set_size(p, entry->size); |
1da177e4 | 849 | } |
1da177e4 | 850 | entry->p = p; |
1a60d4c5 | 851 | mutex_unlock(&info_mutex); |
1da177e4 LT |
852 | return 0; |
853 | } | |
854 | ||
c0d3fb39 TI |
855 | EXPORT_SYMBOL(snd_info_register); |
856 | ||
1da177e4 LT |
857 | /* |
858 | ||
859 | */ | |
860 | ||
24c1f931 | 861 | static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) |
1da177e4 LT |
862 | { |
863 | snd_iprintf(buffer, | |
42662748 JK |
864 | "Advanced Linux Sound Architecture Driver Version k%s.\n", |
865 | init_utsname()->release); | |
1da177e4 LT |
866 | } |
867 | ||
868 | static int __init snd_info_version_init(void) | |
869 | { | |
24c1f931 | 870 | struct snd_info_entry *entry; |
1da177e4 LT |
871 | |
872 | entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL); | |
873 | if (entry == NULL) | |
874 | return -ENOMEM; | |
1da177e4 | 875 | entry->c.text.read = snd_info_version_read; |
b591b6e9 | 876 | return snd_info_register(entry); /* freed in error path */ |
1da177e4 | 877 | } |