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 LT |
83 | |
84 | ||
7e4eeec8 TI |
85 | /* resize the proc r/w buffer */ |
86 | static int resize_info_buffer(struct snd_info_buffer *buffer, | |
87 | unsigned int nsize) | |
88 | { | |
89 | char *nbuf; | |
90 | ||
91 | nsize = PAGE_ALIGN(nsize); | |
9983aa62 | 92 | nbuf = krealloc(buffer->buffer, nsize, GFP_KERNEL); |
7e4eeec8 TI |
93 | if (! nbuf) |
94 | return -ENOMEM; | |
95 | ||
7e4eeec8 TI |
96 | buffer->buffer = nbuf; |
97 | buffer->len = nsize; | |
98 | return 0; | |
99 | } | |
100 | ||
1da177e4 LT |
101 | /** |
102 | * snd_iprintf - printf on the procfs buffer | |
103 | * @buffer: the procfs buffer | |
104 | * @fmt: the printf format | |
105 | * | |
106 | * Outputs the string on the procfs buffer just like printf(). | |
107 | * | |
108 | * Returns the size of output string. | |
109 | */ | |
4f7454a9 | 110 | int snd_iprintf(struct snd_info_buffer *buffer, const char *fmt, ...) |
1da177e4 LT |
111 | { |
112 | va_list args; | |
113 | int len, res; | |
7e4eeec8 | 114 | int err = 0; |
1da177e4 | 115 | |
f001c3ac | 116 | might_sleep(); |
1da177e4 LT |
117 | if (buffer->stop || buffer->error) |
118 | return 0; | |
119 | len = buffer->len - buffer->size; | |
120 | va_start(args, fmt); | |
7e4eeec8 | 121 | for (;;) { |
dbedca39 TI |
122 | va_list ap; |
123 | va_copy(ap, args); | |
124 | res = vsnprintf(buffer->buffer + buffer->curr, len, fmt, ap); | |
125 | va_end(ap); | |
7e4eeec8 TI |
126 | if (res < len) |
127 | break; | |
128 | err = resize_info_buffer(buffer, buffer->len + PAGE_SIZE); | |
129 | if (err < 0) | |
130 | break; | |
131 | len = buffer->len - buffer->size; | |
1da177e4 | 132 | } |
7e4eeec8 TI |
133 | va_end(args); |
134 | ||
135 | if (err < 0) | |
136 | return err; | |
1da177e4 LT |
137 | buffer->curr += res; |
138 | buffer->size += res; | |
139 | return res; | |
140 | } | |
141 | ||
c0d3fb39 TI |
142 | EXPORT_SYMBOL(snd_iprintf); |
143 | ||
1da177e4 LT |
144 | /* |
145 | ||
146 | */ | |
147 | ||
6581f4e7 TI |
148 | static struct proc_dir_entry *snd_proc_root; |
149 | struct snd_info_entry *snd_seq_root; | |
c0d3fb39 TI |
150 | EXPORT_SYMBOL(snd_seq_root); |
151 | ||
1da177e4 | 152 | #ifdef CONFIG_SND_OSSEMUL |
6581f4e7 | 153 | struct snd_info_entry *snd_oss_root; |
1da177e4 LT |
154 | #endif |
155 | ||
1da177e4 LT |
156 | static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig) |
157 | { | |
24c1f931 | 158 | struct snd_info_private_data *data; |
1da177e4 | 159 | struct snd_info_entry *entry; |
73029e0f | 160 | loff_t ret = -EINVAL, size; |
1da177e4 LT |
161 | |
162 | data = file->private_data; | |
163 | entry = data->entry; | |
5b5cd553 | 164 | mutex_lock(&entry->access); |
73029e0f TI |
165 | if (entry->content == SNDRV_INFO_CONTENT_DATA && |
166 | entry->c.ops->llseek) { | |
167 | offset = entry->c.ops->llseek(entry, | |
168 | data->file_private_data, | |
169 | file, offset, orig); | |
170 | goto out; | |
171 | } | |
172 | if (entry->content == SNDRV_INFO_CONTENT_DATA) | |
173 | size = entry->size; | |
174 | else | |
175 | size = 0; | |
176 | switch (orig) { | |
177 | case SEEK_SET: | |
178 | break; | |
179 | case SEEK_CUR: | |
180 | offset += file->f_pos; | |
1da177e4 | 181 | break; |
73029e0f TI |
182 | case SEEK_END: |
183 | if (!size) | |
1da177e4 | 184 | goto out; |
73029e0f | 185 | offset += size; |
1da177e4 | 186 | break; |
73029e0f TI |
187 | default: |
188 | goto out; | |
1da177e4 | 189 | } |
73029e0f TI |
190 | if (offset < 0) |
191 | goto out; | |
192 | if (size && offset > size) | |
193 | offset = size; | |
194 | file->f_pos = offset; | |
195 | ret = offset; | |
196 | out: | |
5b5cd553 | 197 | mutex_unlock(&entry->access); |
1da177e4 LT |
198 | return ret; |
199 | } | |
200 | ||
201 | static ssize_t snd_info_entry_read(struct file *file, char __user *buffer, | |
202 | size_t count, loff_t * offset) | |
203 | { | |
24c1f931 | 204 | struct snd_info_private_data *data; |
1da177e4 | 205 | struct snd_info_entry *entry; |
24c1f931 | 206 | struct snd_info_buffer *buf; |
1da177e4 LT |
207 | size_t size = 0; |
208 | loff_t pos; | |
209 | ||
210 | data = file->private_data; | |
7eaa943c TI |
211 | if (snd_BUG_ON(!data)) |
212 | return -ENXIO; | |
1da177e4 LT |
213 | pos = *offset; |
214 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
215 | return -EIO; | |
216 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
217 | return -EIO; | |
218 | entry = data->entry; | |
219 | switch (entry->content) { | |
220 | case SNDRV_INFO_CONTENT_TEXT: | |
221 | buf = data->rbuffer; | |
222 | if (buf == NULL) | |
223 | return -EIO; | |
224 | if (pos >= buf->size) | |
225 | return 0; | |
226 | size = buf->size - pos; | |
227 | size = min(count, size); | |
228 | if (copy_to_user(buffer, buf->buffer + pos, size)) | |
229 | return -EFAULT; | |
230 | break; | |
231 | case SNDRV_INFO_CONTENT_DATA: | |
d97e1b78 TI |
232 | if (pos >= entry->size) |
233 | return 0; | |
234 | if (entry->c.ops->read) { | |
235 | size = entry->size - pos; | |
236 | size = min(count, size); | |
1da177e4 LT |
237 | size = entry->c.ops->read(entry, |
238 | data->file_private_data, | |
d97e1b78 TI |
239 | file, buffer, size, pos); |
240 | } | |
1da177e4 LT |
241 | break; |
242 | } | |
243 | if ((ssize_t) size > 0) | |
244 | *offset = pos + size; | |
245 | return size; | |
246 | } | |
247 | ||
248 | static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer, | |
249 | size_t count, loff_t * offset) | |
250 | { | |
24c1f931 | 251 | struct snd_info_private_data *data; |
1da177e4 | 252 | struct snd_info_entry *entry; |
24c1f931 | 253 | struct snd_info_buffer *buf; |
7e4eeec8 | 254 | ssize_t size = 0; |
1da177e4 LT |
255 | loff_t pos; |
256 | ||
257 | data = file->private_data; | |
7eaa943c TI |
258 | if (snd_BUG_ON(!data)) |
259 | return -ENXIO; | |
1da177e4 LT |
260 | entry = data->entry; |
261 | pos = *offset; | |
262 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
263 | return -EIO; | |
264 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
265 | return -EIO; | |
266 | switch (entry->content) { | |
267 | case SNDRV_INFO_CONTENT_TEXT: | |
268 | buf = data->wbuffer; | |
269 | if (buf == NULL) | |
270 | return -EIO; | |
f4a747f1 | 271 | mutex_lock(&entry->access); |
7e4eeec8 TI |
272 | if (pos + count >= buf->len) { |
273 | if (resize_info_buffer(buf, pos + count)) { | |
274 | mutex_unlock(&entry->access); | |
275 | return -ENOMEM; | |
276 | } | |
277 | } | |
278 | if (copy_from_user(buf->buffer + pos, buffer, count)) { | |
279 | mutex_unlock(&entry->access); | |
1da177e4 | 280 | return -EFAULT; |
7e4eeec8 TI |
281 | } |
282 | buf->size = pos + count; | |
283 | mutex_unlock(&entry->access); | |
284 | size = count; | |
1da177e4 LT |
285 | break; |
286 | case SNDRV_INFO_CONTENT_DATA: | |
d97e1b78 TI |
287 | if (entry->c.ops->write && count > 0) { |
288 | size_t maxsize = entry->size - pos; | |
289 | count = min(count, maxsize); | |
1da177e4 LT |
290 | size = entry->c.ops->write(entry, |
291 | data->file_private_data, | |
292 | file, buffer, count, pos); | |
d97e1b78 | 293 | } |
1da177e4 LT |
294 | break; |
295 | } | |
296 | if ((ssize_t) size > 0) | |
297 | *offset = pos + size; | |
298 | return size; | |
299 | } | |
300 | ||
301 | static int snd_info_entry_open(struct inode *inode, struct file *file) | |
302 | { | |
24c1f931 TI |
303 | struct snd_info_entry *entry; |
304 | struct snd_info_private_data *data; | |
305 | struct snd_info_buffer *buffer; | |
1da177e4 LT |
306 | int mode, err; |
307 | ||
1a60d4c5 | 308 | mutex_lock(&info_mutex); |
d9dda78b | 309 | entry = PDE_DATA(inode); |
746d4a02 | 310 | if (entry == NULL || ! entry->p) { |
1a60d4c5 | 311 | mutex_unlock(&info_mutex); |
1da177e4 LT |
312 | return -ENODEV; |
313 | } | |
314 | if (!try_module_get(entry->module)) { | |
315 | err = -EFAULT; | |
316 | goto __error1; | |
317 | } | |
318 | mode = file->f_flags & O_ACCMODE; | |
319 | if (mode == O_RDONLY || mode == O_RDWR) { | |
7e4eeec8 | 320 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
1da177e4 LT |
321 | entry->c.ops->read == NULL)) { |
322 | err = -ENODEV; | |
323 | goto __error; | |
324 | } | |
325 | } | |
326 | if (mode == O_WRONLY || mode == O_RDWR) { | |
7e4eeec8 | 327 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
1da177e4 LT |
328 | entry->c.ops->write == NULL)) { |
329 | err = -ENODEV; | |
330 | goto __error; | |
331 | } | |
332 | } | |
ca2c0966 | 333 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
334 | if (data == NULL) { |
335 | err = -ENOMEM; | |
336 | goto __error; | |
337 | } | |
338 | data->entry = entry; | |
339 | switch (entry->content) { | |
340 | case SNDRV_INFO_CONTENT_TEXT: | |
341 | if (mode == O_RDONLY || mode == O_RDWR) { | |
ca2c0966 | 342 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
7e4eeec8 TI |
343 | if (buffer == NULL) |
344 | goto __nomem; | |
1da177e4 | 345 | data->rbuffer = buffer; |
7e4eeec8 TI |
346 | buffer->len = PAGE_SIZE; |
347 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); | |
348 | if (buffer->buffer == NULL) | |
349 | goto __nomem; | |
1da177e4 LT |
350 | } |
351 | if (mode == O_WRONLY || mode == O_RDWR) { | |
ca2c0966 | 352 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
7e4eeec8 TI |
353 | if (buffer == NULL) |
354 | goto __nomem; | |
1da177e4 | 355 | data->wbuffer = buffer; |
7e4eeec8 TI |
356 | buffer->len = PAGE_SIZE; |
357 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); | |
358 | if (buffer->buffer == NULL) | |
359 | goto __nomem; | |
1da177e4 LT |
360 | } |
361 | break; | |
362 | case SNDRV_INFO_CONTENT_DATA: /* data */ | |
363 | if (entry->c.ops->open) { | |
364 | if ((err = entry->c.ops->open(entry, mode, | |
365 | &data->file_private_data)) < 0) { | |
366 | kfree(data); | |
367 | goto __error; | |
368 | } | |
369 | } | |
370 | break; | |
371 | } | |
372 | file->private_data = data; | |
1a60d4c5 | 373 | mutex_unlock(&info_mutex); |
1da177e4 LT |
374 | if (entry->content == SNDRV_INFO_CONTENT_TEXT && |
375 | (mode == O_RDONLY || mode == O_RDWR)) { | |
376 | if (entry->c.text.read) { | |
1a60d4c5 | 377 | mutex_lock(&entry->access); |
1da177e4 | 378 | entry->c.text.read(entry, data->rbuffer); |
1a60d4c5 | 379 | mutex_unlock(&entry->access); |
1da177e4 LT |
380 | } |
381 | } | |
382 | return 0; | |
383 | ||
7e4eeec8 TI |
384 | __nomem: |
385 | if (data->rbuffer) { | |
386 | kfree(data->rbuffer->buffer); | |
387 | kfree(data->rbuffer); | |
388 | } | |
389 | if (data->wbuffer) { | |
390 | kfree(data->wbuffer->buffer); | |
391 | kfree(data->wbuffer); | |
392 | } | |
393 | kfree(data); | |
394 | err = -ENOMEM; | |
1da177e4 LT |
395 | __error: |
396 | module_put(entry->module); | |
397 | __error1: | |
1a60d4c5 | 398 | mutex_unlock(&info_mutex); |
1da177e4 LT |
399 | return err; |
400 | } | |
401 | ||
402 | static int snd_info_entry_release(struct inode *inode, struct file *file) | |
403 | { | |
24c1f931 TI |
404 | struct snd_info_entry *entry; |
405 | struct snd_info_private_data *data; | |
1da177e4 LT |
406 | int mode; |
407 | ||
408 | mode = file->f_flags & O_ACCMODE; | |
409 | data = file->private_data; | |
410 | entry = data->entry; | |
411 | switch (entry->content) { | |
412 | case SNDRV_INFO_CONTENT_TEXT: | |
7e4eeec8 TI |
413 | if (data->rbuffer) { |
414 | kfree(data->rbuffer->buffer); | |
1da177e4 LT |
415 | kfree(data->rbuffer); |
416 | } | |
7e4eeec8 | 417 | if (data->wbuffer) { |
1da177e4 LT |
418 | if (entry->c.text.write) { |
419 | entry->c.text.write(entry, data->wbuffer); | |
420 | if (data->wbuffer->error) { | |
421 | snd_printk(KERN_WARNING "data write error to %s (%i)\n", | |
422 | entry->name, | |
423 | data->wbuffer->error); | |
424 | } | |
425 | } | |
7e4eeec8 | 426 | kfree(data->wbuffer->buffer); |
1da177e4 LT |
427 | kfree(data->wbuffer); |
428 | } | |
429 | break; | |
430 | case SNDRV_INFO_CONTENT_DATA: | |
431 | if (entry->c.ops->release) | |
432 | entry->c.ops->release(entry, mode, | |
433 | data->file_private_data); | |
434 | break; | |
435 | } | |
436 | module_put(entry->module); | |
437 | kfree(data); | |
438 | return 0; | |
439 | } | |
440 | ||
441 | static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait) | |
442 | { | |
24c1f931 | 443 | struct snd_info_private_data *data; |
1da177e4 LT |
444 | struct snd_info_entry *entry; |
445 | unsigned int mask; | |
446 | ||
447 | data = file->private_data; | |
448 | if (data == NULL) | |
449 | return 0; | |
450 | entry = data->entry; | |
451 | mask = 0; | |
452 | switch (entry->content) { | |
453 | case SNDRV_INFO_CONTENT_DATA: | |
454 | if (entry->c.ops->poll) | |
455 | return entry->c.ops->poll(entry, | |
456 | data->file_private_data, | |
457 | file, wait); | |
458 | if (entry->c.ops->read) | |
459 | mask |= POLLIN | POLLRDNORM; | |
460 | if (entry->c.ops->write) | |
461 | mask |= POLLOUT | POLLWRNORM; | |
462 | break; | |
463 | } | |
464 | return mask; | |
465 | } | |
466 | ||
d99e9889 IM |
467 | static long snd_info_entry_ioctl(struct file *file, unsigned int cmd, |
468 | unsigned long arg) | |
1da177e4 | 469 | { |
24c1f931 | 470 | struct snd_info_private_data *data; |
1da177e4 LT |
471 | struct snd_info_entry *entry; |
472 | ||
473 | data = file->private_data; | |
474 | if (data == NULL) | |
475 | return 0; | |
476 | entry = data->entry; | |
477 | switch (entry->content) { | |
478 | case SNDRV_INFO_CONTENT_DATA: | |
479 | if (entry->c.ops->ioctl) | |
480 | return entry->c.ops->ioctl(entry, | |
481 | data->file_private_data, | |
482 | file, cmd, arg); | |
483 | break; | |
484 | } | |
485 | return -ENOTTY; | |
486 | } | |
487 | ||
1da177e4 LT |
488 | static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma) |
489 | { | |
496ad9aa | 490 | struct inode *inode = file_inode(file); |
24c1f931 | 491 | struct snd_info_private_data *data; |
1da177e4 LT |
492 | struct snd_info_entry *entry; |
493 | ||
494 | data = file->private_data; | |
495 | if (data == NULL) | |
496 | return 0; | |
497 | entry = data->entry; | |
498 | switch (entry->content) { | |
499 | case SNDRV_INFO_CONTENT_DATA: | |
500 | if (entry->c.ops->mmap) | |
501 | return entry->c.ops->mmap(entry, | |
502 | data->file_private_data, | |
503 | inode, file, vma); | |
504 | break; | |
505 | } | |
506 | return -ENXIO; | |
507 | } | |
508 | ||
9c2e08c5 | 509 | static const struct file_operations snd_info_entry_operations = |
1da177e4 | 510 | { |
d99e9889 IM |
511 | .owner = THIS_MODULE, |
512 | .llseek = snd_info_entry_llseek, | |
513 | .read = snd_info_entry_read, | |
514 | .write = snd_info_entry_write, | |
515 | .poll = snd_info_entry_poll, | |
516 | .unlocked_ioctl = snd_info_entry_ioctl, | |
517 | .mmap = snd_info_entry_mmap, | |
518 | .open = snd_info_entry_open, | |
519 | .release = snd_info_entry_release, | |
1da177e4 LT |
520 | }; |
521 | ||
1da177e4 LT |
522 | int __init snd_info_init(void) |
523 | { | |
524 | struct proc_dir_entry *p; | |
525 | ||
e55d92b9 | 526 | p = proc_mkdir("asound", NULL); |
1da177e4 LT |
527 | if (p == NULL) |
528 | return -ENOMEM; | |
529 | snd_proc_root = p; | |
530 | #ifdef CONFIG_SND_OSSEMUL | |
531 | { | |
24c1f931 | 532 | struct snd_info_entry *entry; |
1da177e4 LT |
533 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL) |
534 | return -ENOMEM; | |
535 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
536 | if (snd_info_register(entry) < 0) { | |
537 | snd_info_free_entry(entry); | |
538 | return -ENOMEM; | |
539 | } | |
540 | snd_oss_root = entry; | |
541 | } | |
542 | #endif | |
543 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
544 | { | |
24c1f931 | 545 | struct snd_info_entry *entry; |
1da177e4 LT |
546 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL) |
547 | return -ENOMEM; | |
548 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
549 | if (snd_info_register(entry) < 0) { | |
550 | snd_info_free_entry(entry); | |
551 | return -ENOMEM; | |
552 | } | |
553 | snd_seq_root = entry; | |
554 | } | |
555 | #endif | |
556 | snd_info_version_init(); | |
1da177e4 LT |
557 | snd_minor_info_init(); |
558 | snd_minor_info_oss_init(); | |
559 | snd_card_info_init(); | |
560 | return 0; | |
561 | } | |
562 | ||
563 | int __exit snd_info_done(void) | |
564 | { | |
565 | snd_card_info_done(); | |
566 | snd_minor_info_oss_done(); | |
567 | snd_minor_info_done(); | |
1da177e4 LT |
568 | snd_info_version_done(); |
569 | if (snd_proc_root) { | |
570 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
746d4a02 | 571 | snd_info_free_entry(snd_seq_root); |
1da177e4 LT |
572 | #endif |
573 | #ifdef CONFIG_SND_OSSEMUL | |
746d4a02 | 574 | snd_info_free_entry(snd_oss_root); |
1da177e4 | 575 | #endif |
a8ca16ea | 576 | proc_remove(snd_proc_root); |
1da177e4 LT |
577 | } |
578 | return 0; | |
579 | } | |
580 | ||
581 | /* | |
582 | ||
583 | */ | |
584 | ||
585 | ||
586 | /* | |
587 | * create a card proc file | |
588 | * called from init.c | |
589 | */ | |
24c1f931 | 590 | int snd_info_card_create(struct snd_card *card) |
1da177e4 LT |
591 | { |
592 | char str[8]; | |
24c1f931 | 593 | struct snd_info_entry *entry; |
1da177e4 | 594 | |
7eaa943c TI |
595 | if (snd_BUG_ON(!card)) |
596 | return -ENXIO; | |
1da177e4 LT |
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 | ||
7eaa943c TI |
618 | if (snd_BUG_ON(!card)) |
619 | return -ENXIO; | |
1da177e4 LT |
620 | |
621 | if (!strcmp(card->id, card->proc_root->name)) | |
622 | return 0; | |
623 | ||
624 | p = proc_symlink(card->id, snd_proc_root, card->proc_root->name); | |
625 | if (p == NULL) | |
626 | return -ENOMEM; | |
627 | card->proc_root_link = p; | |
628 | return 0; | |
629 | } | |
630 | ||
c2eb9c4e JK |
631 | /* |
632 | * called on card->id change | |
633 | */ | |
634 | void snd_info_card_id_change(struct snd_card *card) | |
635 | { | |
636 | mutex_lock(&info_mutex); | |
637 | if (card->proc_root_link) { | |
a8ca16ea | 638 | proc_remove(card->proc_root_link); |
c2eb9c4e JK |
639 | card->proc_root_link = NULL; |
640 | } | |
641 | if (strcmp(card->id, card->proc_root->name)) | |
642 | card->proc_root_link = proc_symlink(card->id, | |
643 | snd_proc_root, | |
644 | card->proc_root->name); | |
645 | mutex_unlock(&info_mutex); | |
646 | } | |
647 | ||
1da177e4 LT |
648 | /* |
649 | * de-register the card proc file | |
650 | * called from init.c | |
651 | */ | |
746d4a02 | 652 | void snd_info_card_disconnect(struct snd_card *card) |
1da177e4 | 653 | { |
7eaa943c TI |
654 | if (!card) |
655 | return; | |
746d4a02 | 656 | mutex_lock(&info_mutex); |
a8ca16ea DH |
657 | proc_remove(card->proc_root_link); |
658 | card->proc_root_link = NULL; | |
746d4a02 TI |
659 | if (card->proc_root) |
660 | snd_info_disconnect(card->proc_root); | |
661 | mutex_unlock(&info_mutex); | |
662 | } | |
663 | ||
664 | /* | |
665 | * release the card proc file resources | |
666 | * called from init.c | |
667 | */ | |
668 | int snd_info_card_free(struct snd_card *card) | |
669 | { | |
7eaa943c TI |
670 | if (!card) |
671 | return 0; | |
746d4a02 TI |
672 | snd_info_free_entry(card->proc_root); |
673 | card->proc_root = NULL; | |
1da177e4 LT |
674 | return 0; |
675 | } | |
676 | ||
677 | ||
678 | /** | |
679 | * snd_info_get_line - read one line from the procfs buffer | |
680 | * @buffer: the procfs buffer | |
681 | * @line: the buffer to store | |
682 | * @len: the max. buffer size - 1 | |
683 | * | |
684 | * Reads one line from the buffer and stores the string. | |
685 | * | |
686 | * Returns zero if successful, or 1 if error or EOF. | |
687 | */ | |
24c1f931 | 688 | int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) |
1da177e4 LT |
689 | { |
690 | int c = -1; | |
691 | ||
692 | if (len <= 0 || buffer->stop || buffer->error) | |
693 | return 1; | |
694 | while (--len > 0) { | |
7e4eeec8 | 695 | c = buffer->buffer[buffer->curr++]; |
1da177e4 | 696 | if (c == '\n') { |
7e4eeec8 | 697 | if (buffer->curr >= buffer->size) |
1da177e4 | 698 | buffer->stop = 1; |
1da177e4 LT |
699 | break; |
700 | } | |
701 | *line++ = c; | |
7e4eeec8 | 702 | if (buffer->curr >= buffer->size) { |
1da177e4 LT |
703 | buffer->stop = 1; |
704 | break; | |
705 | } | |
706 | } | |
707 | while (c != '\n' && !buffer->stop) { | |
7e4eeec8 TI |
708 | c = buffer->buffer[buffer->curr++]; |
709 | if (buffer->curr >= buffer->size) | |
1da177e4 | 710 | buffer->stop = 1; |
1da177e4 LT |
711 | } |
712 | *line = '\0'; | |
713 | return 0; | |
714 | } | |
715 | ||
c0d3fb39 TI |
716 | EXPORT_SYMBOL(snd_info_get_line); |
717 | ||
1da177e4 | 718 | /** |
856def8a | 719 | * snd_info_get_str - parse a string token |
1da177e4 LT |
720 | * @dest: the buffer to store the string token |
721 | * @src: the original string | |
722 | * @len: the max. length of token - 1 | |
723 | * | |
724 | * Parses the original string and copy a token to the given | |
725 | * string buffer. | |
726 | * | |
727 | * Returns the updated pointer of the original string so that | |
728 | * it can be used for the next call. | |
729 | */ | |
4f7454a9 | 730 | const char *snd_info_get_str(char *dest, const char *src, int len) |
1da177e4 LT |
731 | { |
732 | int c; | |
733 | ||
734 | while (*src == ' ' || *src == '\t') | |
735 | src++; | |
736 | if (*src == '"' || *src == '\'') { | |
737 | c = *src++; | |
738 | while (--len > 0 && *src && *src != c) { | |
739 | *dest++ = *src++; | |
740 | } | |
741 | if (*src == c) | |
742 | src++; | |
743 | } else { | |
744 | while (--len > 0 && *src && *src != ' ' && *src != '\t') { | |
745 | *dest++ = *src++; | |
746 | } | |
747 | } | |
748 | *dest = 0; | |
749 | while (*src == ' ' || *src == '\t') | |
750 | src++; | |
751 | return src; | |
752 | } | |
753 | ||
c0d3fb39 TI |
754 | EXPORT_SYMBOL(snd_info_get_str); |
755 | ||
1da177e4 LT |
756 | /** |
757 | * snd_info_create_entry - create an info entry | |
758 | * @name: the proc file name | |
759 | * | |
760 | * Creates an info entry with the given file name and initializes as | |
761 | * the default state. | |
762 | * | |
763 | * Usually called from other functions such as | |
764 | * snd_info_create_card_entry(). | |
765 | * | |
766 | * Returns the pointer of the new instance, or NULL on failure. | |
767 | */ | |
24c1f931 | 768 | static struct snd_info_entry *snd_info_create_entry(const char *name) |
1da177e4 | 769 | { |
24c1f931 | 770 | struct snd_info_entry *entry; |
ca2c0966 | 771 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
1da177e4 LT |
772 | if (entry == NULL) |
773 | return NULL; | |
543537bd | 774 | entry->name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
775 | if (entry->name == NULL) { |
776 | kfree(entry); | |
777 | return NULL; | |
778 | } | |
779 | entry->mode = S_IFREG | S_IRUGO; | |
780 | entry->content = SNDRV_INFO_CONTENT_TEXT; | |
1a60d4c5 | 781 | mutex_init(&entry->access); |
746d4a02 TI |
782 | INIT_LIST_HEAD(&entry->children); |
783 | INIT_LIST_HEAD(&entry->list); | |
1da177e4 LT |
784 | return entry; |
785 | } | |
786 | ||
787 | /** | |
788 | * snd_info_create_module_entry - create an info entry for the given module | |
789 | * @module: the module pointer | |
790 | * @name: the file name | |
791 | * @parent: the parent directory | |
792 | * | |
793 | * Creates a new info entry and assigns it to the given module. | |
794 | * | |
795 | * Returns the pointer of the new instance, or NULL on failure. | |
796 | */ | |
24c1f931 | 797 | struct snd_info_entry *snd_info_create_module_entry(struct module * module, |
1da177e4 | 798 | const char *name, |
24c1f931 | 799 | struct snd_info_entry *parent) |
1da177e4 | 800 | { |
24c1f931 | 801 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
802 | if (entry) { |
803 | entry->module = module; | |
804 | entry->parent = parent; | |
805 | } | |
806 | return entry; | |
807 | } | |
808 | ||
c0d3fb39 TI |
809 | EXPORT_SYMBOL(snd_info_create_module_entry); |
810 | ||
1da177e4 LT |
811 | /** |
812 | * snd_info_create_card_entry - create an info entry for the given card | |
813 | * @card: the card instance | |
814 | * @name: the file name | |
815 | * @parent: the parent directory | |
816 | * | |
817 | * Creates a new info entry and assigns it to the given card. | |
818 | * | |
819 | * Returns the pointer of the new instance, or NULL on failure. | |
820 | */ | |
24c1f931 | 821 | struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, |
1da177e4 | 822 | const char *name, |
24c1f931 | 823 | struct snd_info_entry * parent) |
1da177e4 | 824 | { |
24c1f931 | 825 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
826 | if (entry) { |
827 | entry->module = card->module; | |
828 | entry->card = card; | |
829 | entry->parent = parent; | |
830 | } | |
831 | return entry; | |
832 | } | |
833 | ||
c0d3fb39 TI |
834 | EXPORT_SYMBOL(snd_info_create_card_entry); |
835 | ||
746d4a02 | 836 | static void snd_info_disconnect(struct snd_info_entry *entry) |
1da177e4 | 837 | { |
746d4a02 TI |
838 | struct list_head *p, *n; |
839 | struct proc_dir_entry *root; | |
1da177e4 | 840 | |
746d4a02 TI |
841 | list_for_each_safe(p, n, &entry->children) { |
842 | snd_info_disconnect(list_entry(p, struct snd_info_entry, list)); | |
843 | } | |
844 | ||
845 | if (! entry->p) | |
846 | return; | |
847 | list_del_init(&entry->list); | |
848 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; | |
7eaa943c | 849 | snd_BUG_ON(!root); |
a8ca16ea | 850 | proc_remove(entry->p); |
746d4a02 | 851 | entry->p = NULL; |
1da177e4 LT |
852 | } |
853 | ||
746d4a02 | 854 | static int snd_info_dev_free_entry(struct snd_device *device) |
1da177e4 | 855 | { |
24c1f931 | 856 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 857 | snd_info_free_entry(entry); |
1da177e4 LT |
858 | return 0; |
859 | } | |
860 | ||
746d4a02 | 861 | static int snd_info_dev_register_entry(struct snd_device *device) |
1da177e4 | 862 | { |
24c1f931 | 863 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 864 | return snd_info_register(entry); |
1da177e4 LT |
865 | } |
866 | ||
867 | /** | |
868 | * snd_card_proc_new - create an info entry for the given card | |
869 | * @card: the card instance | |
870 | * @name: the file name | |
871 | * @entryp: the pointer to store the new info entry | |
872 | * | |
873 | * Creates a new info entry and assigns it to the given card. | |
874 | * Unlike snd_info_create_card_entry(), this function registers the | |
875 | * info entry as an ALSA device component, so that it can be | |
876 | * unregistered/released without explicit call. | |
877 | * Also, you don't have to register this entry via snd_info_register(), | |
878 | * since this will be registered by snd_card_register() automatically. | |
879 | * | |
880 | * The parent is assumed as card->proc_root. | |
881 | * | |
882 | * For releasing this entry, use snd_device_free() instead of | |
883 | * snd_info_free_entry(). | |
884 | * | |
885 | * Returns zero if successful, or a negative error code on failure. | |
886 | */ | |
24c1f931 TI |
887 | int snd_card_proc_new(struct snd_card *card, const char *name, |
888 | struct snd_info_entry **entryp) | |
1da177e4 | 889 | { |
24c1f931 | 890 | static struct snd_device_ops ops = { |
1da177e4 LT |
891 | .dev_free = snd_info_dev_free_entry, |
892 | .dev_register = snd_info_dev_register_entry, | |
746d4a02 | 893 | /* disconnect is done via snd_info_card_disconnect() */ |
1da177e4 | 894 | }; |
24c1f931 | 895 | struct snd_info_entry *entry; |
1da177e4 LT |
896 | int err; |
897 | ||
898 | entry = snd_info_create_card_entry(card, name, card->proc_root); | |
899 | if (! entry) | |
900 | return -ENOMEM; | |
901 | if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) { | |
902 | snd_info_free_entry(entry); | |
903 | return err; | |
904 | } | |
905 | if (entryp) | |
906 | *entryp = entry; | |
907 | return 0; | |
908 | } | |
909 | ||
c0d3fb39 TI |
910 | EXPORT_SYMBOL(snd_card_proc_new); |
911 | ||
1da177e4 LT |
912 | /** |
913 | * snd_info_free_entry - release the info entry | |
914 | * @entry: the info entry | |
915 | * | |
916 | * Releases the info entry. Don't call this after registered. | |
917 | */ | |
24c1f931 | 918 | void snd_info_free_entry(struct snd_info_entry * entry) |
1da177e4 LT |
919 | { |
920 | if (entry == NULL) | |
921 | return; | |
746d4a02 TI |
922 | if (entry->p) { |
923 | mutex_lock(&info_mutex); | |
924 | snd_info_disconnect(entry); | |
925 | mutex_unlock(&info_mutex); | |
926 | } | |
1da177e4 LT |
927 | kfree(entry->name); |
928 | if (entry->private_free) | |
929 | entry->private_free(entry); | |
930 | kfree(entry); | |
931 | } | |
932 | ||
c0d3fb39 TI |
933 | EXPORT_SYMBOL(snd_info_free_entry); |
934 | ||
1da177e4 LT |
935 | /** |
936 | * snd_info_register - register the info entry | |
937 | * @entry: the info entry | |
938 | * | |
939 | * Registers the proc info entry. | |
940 | * | |
941 | * Returns zero if successful, or a negative error code on failure. | |
942 | */ | |
24c1f931 | 943 | int snd_info_register(struct snd_info_entry * entry) |
1da177e4 LT |
944 | { |
945 | struct proc_dir_entry *root, *p = NULL; | |
946 | ||
7eaa943c TI |
947 | if (snd_BUG_ON(!entry)) |
948 | return -ENXIO; | |
1da177e4 | 949 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; |
1a60d4c5 | 950 | mutex_lock(&info_mutex); |
aee0c612 AV |
951 | if (S_ISDIR(entry->mode)) { |
952 | p = proc_mkdir_mode(entry->name, entry->mode, root); | |
953 | if (!p) { | |
954 | mutex_unlock(&info_mutex); | |
955 | return -ENOMEM; | |
956 | } | |
957 | } else { | |
958 | p = proc_create_data(entry->name, entry->mode, root, | |
959 | &snd_info_entry_operations, entry); | |
960 | if (!p) { | |
961 | mutex_unlock(&info_mutex); | |
962 | return -ENOMEM; | |
963 | } | |
271a15ea | 964 | proc_set_size(p, entry->size); |
1da177e4 | 965 | } |
1da177e4 | 966 | entry->p = p; |
746d4a02 TI |
967 | if (entry->parent) |
968 | list_add_tail(&entry->list, &entry->parent->children); | |
1a60d4c5 | 969 | mutex_unlock(&info_mutex); |
1da177e4 LT |
970 | return 0; |
971 | } | |
972 | ||
c0d3fb39 TI |
973 | EXPORT_SYMBOL(snd_info_register); |
974 | ||
1da177e4 LT |
975 | /* |
976 | ||
977 | */ | |
978 | ||
6581f4e7 | 979 | static struct snd_info_entry *snd_info_version_entry; |
1da177e4 | 980 | |
24c1f931 | 981 | static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) |
1da177e4 LT |
982 | { |
983 | snd_iprintf(buffer, | |
42662748 JK |
984 | "Advanced Linux Sound Architecture Driver Version k%s.\n", |
985 | init_utsname()->release); | |
1da177e4 LT |
986 | } |
987 | ||
988 | static int __init snd_info_version_init(void) | |
989 | { | |
24c1f931 | 990 | struct snd_info_entry *entry; |
1da177e4 LT |
991 | |
992 | entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL); | |
993 | if (entry == NULL) | |
994 | return -ENOMEM; | |
1da177e4 LT |
995 | entry->c.text.read = snd_info_version_read; |
996 | if (snd_info_register(entry) < 0) { | |
997 | snd_info_free_entry(entry); | |
998 | return -ENOMEM; | |
999 | } | |
1000 | snd_info_version_entry = entry; | |
1001 | return 0; | |
1002 | } | |
1003 | ||
1004 | static int __exit snd_info_version_done(void) | |
1005 | { | |
746d4a02 | 1006 | snd_info_free_entry(snd_info_version_entry); |
1da177e4 LT |
1007 | return 0; |
1008 | } | |
1009 | ||
1010 | #endif /* CONFIG_PROC_FS */ |