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Commit | Line | Data |
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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 void snd_remove_proc_entry(struct proc_dir_entry *parent, |
157 | struct proc_dir_entry *de) | |
158 | { | |
159 | if (de) | |
160 | remove_proc_entry(de->name, parent); | |
161 | } | |
162 | ||
163 | static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig) | |
164 | { | |
24c1f931 | 165 | struct snd_info_private_data *data; |
1da177e4 | 166 | struct snd_info_entry *entry; |
73029e0f | 167 | loff_t ret = -EINVAL, size; |
1da177e4 LT |
168 | |
169 | data = file->private_data; | |
170 | entry = data->entry; | |
5b5cd553 | 171 | mutex_lock(&entry->access); |
73029e0f TI |
172 | if (entry->content == SNDRV_INFO_CONTENT_DATA && |
173 | entry->c.ops->llseek) { | |
174 | offset = entry->c.ops->llseek(entry, | |
175 | data->file_private_data, | |
176 | file, offset, orig); | |
177 | goto out; | |
178 | } | |
179 | if (entry->content == SNDRV_INFO_CONTENT_DATA) | |
180 | size = entry->size; | |
181 | else | |
182 | size = 0; | |
183 | switch (orig) { | |
184 | case SEEK_SET: | |
185 | break; | |
186 | case SEEK_CUR: | |
187 | offset += file->f_pos; | |
1da177e4 | 188 | break; |
73029e0f TI |
189 | case SEEK_END: |
190 | if (!size) | |
1da177e4 | 191 | goto out; |
73029e0f | 192 | offset += size; |
1da177e4 | 193 | break; |
73029e0f TI |
194 | default: |
195 | goto out; | |
1da177e4 | 196 | } |
73029e0f TI |
197 | if (offset < 0) |
198 | goto out; | |
199 | if (size && offset > size) | |
200 | offset = size; | |
201 | file->f_pos = offset; | |
202 | ret = offset; | |
203 | out: | |
5b5cd553 | 204 | mutex_unlock(&entry->access); |
1da177e4 LT |
205 | return ret; |
206 | } | |
207 | ||
208 | static ssize_t snd_info_entry_read(struct file *file, char __user *buffer, | |
209 | size_t count, loff_t * offset) | |
210 | { | |
24c1f931 | 211 | struct snd_info_private_data *data; |
1da177e4 | 212 | struct snd_info_entry *entry; |
24c1f931 | 213 | struct snd_info_buffer *buf; |
1da177e4 LT |
214 | size_t size = 0; |
215 | loff_t pos; | |
216 | ||
217 | data = file->private_data; | |
7eaa943c TI |
218 | if (snd_BUG_ON(!data)) |
219 | return -ENXIO; | |
1da177e4 LT |
220 | pos = *offset; |
221 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
222 | return -EIO; | |
223 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
224 | return -EIO; | |
225 | entry = data->entry; | |
226 | switch (entry->content) { | |
227 | case SNDRV_INFO_CONTENT_TEXT: | |
228 | buf = data->rbuffer; | |
229 | if (buf == NULL) | |
230 | return -EIO; | |
231 | if (pos >= buf->size) | |
232 | return 0; | |
233 | size = buf->size - pos; | |
234 | size = min(count, size); | |
235 | if (copy_to_user(buffer, buf->buffer + pos, size)) | |
236 | return -EFAULT; | |
237 | break; | |
238 | case SNDRV_INFO_CONTENT_DATA: | |
d97e1b78 TI |
239 | if (pos >= entry->size) |
240 | return 0; | |
241 | if (entry->c.ops->read) { | |
242 | size = entry->size - pos; | |
243 | size = min(count, size); | |
1da177e4 LT |
244 | size = entry->c.ops->read(entry, |
245 | data->file_private_data, | |
d97e1b78 TI |
246 | file, buffer, size, pos); |
247 | } | |
1da177e4 LT |
248 | break; |
249 | } | |
250 | if ((ssize_t) size > 0) | |
251 | *offset = pos + size; | |
252 | return size; | |
253 | } | |
254 | ||
255 | static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer, | |
256 | size_t count, loff_t * offset) | |
257 | { | |
24c1f931 | 258 | struct snd_info_private_data *data; |
1da177e4 | 259 | struct snd_info_entry *entry; |
24c1f931 | 260 | struct snd_info_buffer *buf; |
7e4eeec8 | 261 | ssize_t size = 0; |
1da177e4 LT |
262 | loff_t pos; |
263 | ||
264 | data = file->private_data; | |
7eaa943c TI |
265 | if (snd_BUG_ON(!data)) |
266 | return -ENXIO; | |
1da177e4 LT |
267 | entry = data->entry; |
268 | pos = *offset; | |
269 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
270 | return -EIO; | |
271 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
272 | return -EIO; | |
273 | switch (entry->content) { | |
274 | case SNDRV_INFO_CONTENT_TEXT: | |
275 | buf = data->wbuffer; | |
276 | if (buf == NULL) | |
277 | return -EIO; | |
f4a747f1 | 278 | mutex_lock(&entry->access); |
7e4eeec8 TI |
279 | if (pos + count >= buf->len) { |
280 | if (resize_info_buffer(buf, pos + count)) { | |
281 | mutex_unlock(&entry->access); | |
282 | return -ENOMEM; | |
283 | } | |
284 | } | |
285 | if (copy_from_user(buf->buffer + pos, buffer, count)) { | |
286 | mutex_unlock(&entry->access); | |
1da177e4 | 287 | return -EFAULT; |
7e4eeec8 TI |
288 | } |
289 | buf->size = pos + count; | |
290 | mutex_unlock(&entry->access); | |
291 | size = count; | |
1da177e4 LT |
292 | break; |
293 | case SNDRV_INFO_CONTENT_DATA: | |
d97e1b78 TI |
294 | if (entry->c.ops->write && count > 0) { |
295 | size_t maxsize = entry->size - pos; | |
296 | count = min(count, maxsize); | |
1da177e4 LT |
297 | size = entry->c.ops->write(entry, |
298 | data->file_private_data, | |
299 | file, buffer, count, pos); | |
d97e1b78 | 300 | } |
1da177e4 LT |
301 | break; |
302 | } | |
303 | if ((ssize_t) size > 0) | |
304 | *offset = pos + size; | |
305 | return size; | |
306 | } | |
307 | ||
308 | static int snd_info_entry_open(struct inode *inode, struct file *file) | |
309 | { | |
24c1f931 TI |
310 | struct snd_info_entry *entry; |
311 | struct snd_info_private_data *data; | |
312 | struct snd_info_buffer *buffer; | |
1da177e4 LT |
313 | struct proc_dir_entry *p; |
314 | int mode, err; | |
315 | ||
1a60d4c5 | 316 | mutex_lock(&info_mutex); |
1da177e4 | 317 | p = PDE(inode); |
24c1f931 | 318 | entry = p == NULL ? NULL : (struct snd_info_entry *)p->data; |
746d4a02 | 319 | if (entry == NULL || ! entry->p) { |
1a60d4c5 | 320 | mutex_unlock(&info_mutex); |
1da177e4 LT |
321 | return -ENODEV; |
322 | } | |
323 | if (!try_module_get(entry->module)) { | |
324 | err = -EFAULT; | |
325 | goto __error1; | |
326 | } | |
327 | mode = file->f_flags & O_ACCMODE; | |
328 | if (mode == O_RDONLY || mode == O_RDWR) { | |
7e4eeec8 | 329 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
1da177e4 LT |
330 | entry->c.ops->read == NULL)) { |
331 | err = -ENODEV; | |
332 | goto __error; | |
333 | } | |
334 | } | |
335 | if (mode == O_WRONLY || mode == O_RDWR) { | |
7e4eeec8 | 336 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
1da177e4 LT |
337 | entry->c.ops->write == NULL)) { |
338 | err = -ENODEV; | |
339 | goto __error; | |
340 | } | |
341 | } | |
ca2c0966 | 342 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
343 | if (data == NULL) { |
344 | err = -ENOMEM; | |
345 | goto __error; | |
346 | } | |
347 | data->entry = entry; | |
348 | switch (entry->content) { | |
349 | case SNDRV_INFO_CONTENT_TEXT: | |
350 | if (mode == O_RDONLY || mode == O_RDWR) { | |
ca2c0966 | 351 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
7e4eeec8 TI |
352 | if (buffer == NULL) |
353 | goto __nomem; | |
1da177e4 | 354 | data->rbuffer = buffer; |
7e4eeec8 TI |
355 | buffer->len = PAGE_SIZE; |
356 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); | |
357 | if (buffer->buffer == NULL) | |
358 | goto __nomem; | |
1da177e4 LT |
359 | } |
360 | if (mode == O_WRONLY || mode == O_RDWR) { | |
ca2c0966 | 361 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
7e4eeec8 TI |
362 | if (buffer == NULL) |
363 | goto __nomem; | |
1da177e4 | 364 | data->wbuffer = buffer; |
7e4eeec8 TI |
365 | buffer->len = PAGE_SIZE; |
366 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); | |
367 | if (buffer->buffer == NULL) | |
368 | goto __nomem; | |
1da177e4 LT |
369 | } |
370 | break; | |
371 | case SNDRV_INFO_CONTENT_DATA: /* data */ | |
372 | if (entry->c.ops->open) { | |
373 | if ((err = entry->c.ops->open(entry, mode, | |
374 | &data->file_private_data)) < 0) { | |
375 | kfree(data); | |
376 | goto __error; | |
377 | } | |
378 | } | |
379 | break; | |
380 | } | |
381 | file->private_data = data; | |
1a60d4c5 | 382 | mutex_unlock(&info_mutex); |
1da177e4 LT |
383 | if (entry->content == SNDRV_INFO_CONTENT_TEXT && |
384 | (mode == O_RDONLY || mode == O_RDWR)) { | |
385 | if (entry->c.text.read) { | |
1a60d4c5 | 386 | mutex_lock(&entry->access); |
1da177e4 | 387 | entry->c.text.read(entry, data->rbuffer); |
1a60d4c5 | 388 | mutex_unlock(&entry->access); |
1da177e4 LT |
389 | } |
390 | } | |
391 | return 0; | |
392 | ||
7e4eeec8 TI |
393 | __nomem: |
394 | if (data->rbuffer) { | |
395 | kfree(data->rbuffer->buffer); | |
396 | kfree(data->rbuffer); | |
397 | } | |
398 | if (data->wbuffer) { | |
399 | kfree(data->wbuffer->buffer); | |
400 | kfree(data->wbuffer); | |
401 | } | |
402 | kfree(data); | |
403 | err = -ENOMEM; | |
1da177e4 LT |
404 | __error: |
405 | module_put(entry->module); | |
406 | __error1: | |
1a60d4c5 | 407 | mutex_unlock(&info_mutex); |
1da177e4 LT |
408 | return err; |
409 | } | |
410 | ||
411 | static int snd_info_entry_release(struct inode *inode, struct file *file) | |
412 | { | |
24c1f931 TI |
413 | struct snd_info_entry *entry; |
414 | struct snd_info_private_data *data; | |
1da177e4 LT |
415 | int mode; |
416 | ||
417 | mode = file->f_flags & O_ACCMODE; | |
418 | data = file->private_data; | |
419 | entry = data->entry; | |
420 | switch (entry->content) { | |
421 | case SNDRV_INFO_CONTENT_TEXT: | |
7e4eeec8 TI |
422 | if (data->rbuffer) { |
423 | kfree(data->rbuffer->buffer); | |
1da177e4 LT |
424 | kfree(data->rbuffer); |
425 | } | |
7e4eeec8 | 426 | if (data->wbuffer) { |
1da177e4 LT |
427 | if (entry->c.text.write) { |
428 | entry->c.text.write(entry, data->wbuffer); | |
429 | if (data->wbuffer->error) { | |
430 | snd_printk(KERN_WARNING "data write error to %s (%i)\n", | |
431 | entry->name, | |
432 | data->wbuffer->error); | |
433 | } | |
434 | } | |
7e4eeec8 | 435 | kfree(data->wbuffer->buffer); |
1da177e4 LT |
436 | kfree(data->wbuffer); |
437 | } | |
438 | break; | |
439 | case SNDRV_INFO_CONTENT_DATA: | |
440 | if (entry->c.ops->release) | |
441 | entry->c.ops->release(entry, mode, | |
442 | data->file_private_data); | |
443 | break; | |
444 | } | |
445 | module_put(entry->module); | |
446 | kfree(data); | |
447 | return 0; | |
448 | } | |
449 | ||
450 | static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait) | |
451 | { | |
24c1f931 | 452 | struct snd_info_private_data *data; |
1da177e4 LT |
453 | struct snd_info_entry *entry; |
454 | unsigned int mask; | |
455 | ||
456 | data = file->private_data; | |
457 | if (data == NULL) | |
458 | return 0; | |
459 | entry = data->entry; | |
460 | mask = 0; | |
461 | switch (entry->content) { | |
462 | case SNDRV_INFO_CONTENT_DATA: | |
463 | if (entry->c.ops->poll) | |
464 | return entry->c.ops->poll(entry, | |
465 | data->file_private_data, | |
466 | file, wait); | |
467 | if (entry->c.ops->read) | |
468 | mask |= POLLIN | POLLRDNORM; | |
469 | if (entry->c.ops->write) | |
470 | mask |= POLLOUT | POLLWRNORM; | |
471 | break; | |
472 | } | |
473 | return mask; | |
474 | } | |
475 | ||
d99e9889 IM |
476 | static long snd_info_entry_ioctl(struct file *file, unsigned int cmd, |
477 | unsigned long arg) | |
1da177e4 | 478 | { |
24c1f931 | 479 | struct snd_info_private_data *data; |
1da177e4 LT |
480 | struct snd_info_entry *entry; |
481 | ||
482 | data = file->private_data; | |
483 | if (data == NULL) | |
484 | return 0; | |
485 | entry = data->entry; | |
486 | switch (entry->content) { | |
487 | case SNDRV_INFO_CONTENT_DATA: | |
488 | if (entry->c.ops->ioctl) | |
489 | return entry->c.ops->ioctl(entry, | |
490 | data->file_private_data, | |
491 | file, cmd, arg); | |
492 | break; | |
493 | } | |
494 | return -ENOTTY; | |
495 | } | |
496 | ||
1da177e4 LT |
497 | static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma) |
498 | { | |
496ad9aa | 499 | struct inode *inode = file_inode(file); |
24c1f931 | 500 | struct snd_info_private_data *data; |
1da177e4 LT |
501 | struct snd_info_entry *entry; |
502 | ||
503 | data = file->private_data; | |
504 | if (data == NULL) | |
505 | return 0; | |
506 | entry = data->entry; | |
507 | switch (entry->content) { | |
508 | case SNDRV_INFO_CONTENT_DATA: | |
509 | if (entry->c.ops->mmap) | |
510 | return entry->c.ops->mmap(entry, | |
511 | data->file_private_data, | |
512 | inode, file, vma); | |
513 | break; | |
514 | } | |
515 | return -ENXIO; | |
516 | } | |
517 | ||
9c2e08c5 | 518 | static const struct file_operations snd_info_entry_operations = |
1da177e4 | 519 | { |
d99e9889 IM |
520 | .owner = THIS_MODULE, |
521 | .llseek = snd_info_entry_llseek, | |
522 | .read = snd_info_entry_read, | |
523 | .write = snd_info_entry_write, | |
524 | .poll = snd_info_entry_poll, | |
525 | .unlocked_ioctl = snd_info_entry_ioctl, | |
526 | .mmap = snd_info_entry_mmap, | |
527 | .open = snd_info_entry_open, | |
528 | .release = snd_info_entry_release, | |
1da177e4 LT |
529 | }; |
530 | ||
1da177e4 LT |
531 | int __init snd_info_init(void) |
532 | { | |
533 | struct proc_dir_entry *p; | |
534 | ||
e55d92b9 | 535 | p = proc_mkdir("asound", NULL); |
1da177e4 LT |
536 | if (p == NULL) |
537 | return -ENOMEM; | |
538 | snd_proc_root = p; | |
539 | #ifdef CONFIG_SND_OSSEMUL | |
540 | { | |
24c1f931 | 541 | struct snd_info_entry *entry; |
1da177e4 LT |
542 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL) |
543 | return -ENOMEM; | |
544 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
545 | if (snd_info_register(entry) < 0) { | |
546 | snd_info_free_entry(entry); | |
547 | return -ENOMEM; | |
548 | } | |
549 | snd_oss_root = entry; | |
550 | } | |
551 | #endif | |
552 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
553 | { | |
24c1f931 | 554 | struct snd_info_entry *entry; |
1da177e4 LT |
555 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL) |
556 | return -ENOMEM; | |
557 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
558 | if (snd_info_register(entry) < 0) { | |
559 | snd_info_free_entry(entry); | |
560 | return -ENOMEM; | |
561 | } | |
562 | snd_seq_root = entry; | |
563 | } | |
564 | #endif | |
565 | snd_info_version_init(); | |
1da177e4 LT |
566 | snd_minor_info_init(); |
567 | snd_minor_info_oss_init(); | |
568 | snd_card_info_init(); | |
569 | return 0; | |
570 | } | |
571 | ||
572 | int __exit snd_info_done(void) | |
573 | { | |
574 | snd_card_info_done(); | |
575 | snd_minor_info_oss_done(); | |
576 | snd_minor_info_done(); | |
1da177e4 LT |
577 | snd_info_version_done(); |
578 | if (snd_proc_root) { | |
579 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
746d4a02 | 580 | snd_info_free_entry(snd_seq_root); |
1da177e4 LT |
581 | #endif |
582 | #ifdef CONFIG_SND_OSSEMUL | |
746d4a02 | 583 | snd_info_free_entry(snd_oss_root); |
1da177e4 | 584 | #endif |
c74c120a | 585 | snd_remove_proc_entry(NULL, snd_proc_root); |
1da177e4 LT |
586 | } |
587 | return 0; | |
588 | } | |
589 | ||
590 | /* | |
591 | ||
592 | */ | |
593 | ||
594 | ||
595 | /* | |
596 | * create a card proc file | |
597 | * called from init.c | |
598 | */ | |
24c1f931 | 599 | int snd_info_card_create(struct snd_card *card) |
1da177e4 LT |
600 | { |
601 | char str[8]; | |
24c1f931 | 602 | struct snd_info_entry *entry; |
1da177e4 | 603 | |
7eaa943c TI |
604 | if (snd_BUG_ON(!card)) |
605 | return -ENXIO; | |
1da177e4 LT |
606 | |
607 | sprintf(str, "card%i", card->number); | |
608 | if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL) | |
609 | return -ENOMEM; | |
610 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
611 | if (snd_info_register(entry) < 0) { | |
612 | snd_info_free_entry(entry); | |
613 | return -ENOMEM; | |
614 | } | |
615 | card->proc_root = entry; | |
616 | return 0; | |
617 | } | |
618 | ||
619 | /* | |
620 | * register the card proc file | |
621 | * called from init.c | |
622 | */ | |
24c1f931 | 623 | int snd_info_card_register(struct snd_card *card) |
1da177e4 LT |
624 | { |
625 | struct proc_dir_entry *p; | |
626 | ||
7eaa943c TI |
627 | if (snd_BUG_ON(!card)) |
628 | return -ENXIO; | |
1da177e4 LT |
629 | |
630 | if (!strcmp(card->id, card->proc_root->name)) | |
631 | return 0; | |
632 | ||
633 | p = proc_symlink(card->id, snd_proc_root, card->proc_root->name); | |
634 | if (p == NULL) | |
635 | return -ENOMEM; | |
636 | card->proc_root_link = p; | |
637 | return 0; | |
638 | } | |
639 | ||
c2eb9c4e JK |
640 | /* |
641 | * called on card->id change | |
642 | */ | |
643 | void snd_info_card_id_change(struct snd_card *card) | |
644 | { | |
645 | mutex_lock(&info_mutex); | |
646 | if (card->proc_root_link) { | |
647 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); | |
648 | card->proc_root_link = NULL; | |
649 | } | |
650 | if (strcmp(card->id, card->proc_root->name)) | |
651 | card->proc_root_link = proc_symlink(card->id, | |
652 | snd_proc_root, | |
653 | card->proc_root->name); | |
654 | mutex_unlock(&info_mutex); | |
655 | } | |
656 | ||
1da177e4 LT |
657 | /* |
658 | * de-register the card proc file | |
659 | * called from init.c | |
660 | */ | |
746d4a02 | 661 | void snd_info_card_disconnect(struct snd_card *card) |
1da177e4 | 662 | { |
7eaa943c TI |
663 | if (!card) |
664 | return; | |
746d4a02 | 665 | mutex_lock(&info_mutex); |
1da177e4 LT |
666 | if (card->proc_root_link) { |
667 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); | |
668 | card->proc_root_link = NULL; | |
669 | } | |
746d4a02 TI |
670 | if (card->proc_root) |
671 | snd_info_disconnect(card->proc_root); | |
672 | mutex_unlock(&info_mutex); | |
673 | } | |
674 | ||
675 | /* | |
676 | * release the card proc file resources | |
677 | * called from init.c | |
678 | */ | |
679 | int snd_info_card_free(struct snd_card *card) | |
680 | { | |
7eaa943c TI |
681 | if (!card) |
682 | return 0; | |
746d4a02 TI |
683 | snd_info_free_entry(card->proc_root); |
684 | card->proc_root = NULL; | |
1da177e4 LT |
685 | return 0; |
686 | } | |
687 | ||
688 | ||
689 | /** | |
690 | * snd_info_get_line - read one line from the procfs buffer | |
691 | * @buffer: the procfs buffer | |
692 | * @line: the buffer to store | |
693 | * @len: the max. buffer size - 1 | |
694 | * | |
695 | * Reads one line from the buffer and stores the string. | |
696 | * | |
697 | * Returns zero if successful, or 1 if error or EOF. | |
698 | */ | |
24c1f931 | 699 | int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) |
1da177e4 LT |
700 | { |
701 | int c = -1; | |
702 | ||
703 | if (len <= 0 || buffer->stop || buffer->error) | |
704 | return 1; | |
705 | while (--len > 0) { | |
7e4eeec8 | 706 | c = buffer->buffer[buffer->curr++]; |
1da177e4 | 707 | if (c == '\n') { |
7e4eeec8 | 708 | if (buffer->curr >= buffer->size) |
1da177e4 | 709 | buffer->stop = 1; |
1da177e4 LT |
710 | break; |
711 | } | |
712 | *line++ = c; | |
7e4eeec8 | 713 | if (buffer->curr >= buffer->size) { |
1da177e4 LT |
714 | buffer->stop = 1; |
715 | break; | |
716 | } | |
717 | } | |
718 | while (c != '\n' && !buffer->stop) { | |
7e4eeec8 TI |
719 | c = buffer->buffer[buffer->curr++]; |
720 | if (buffer->curr >= buffer->size) | |
1da177e4 | 721 | buffer->stop = 1; |
1da177e4 LT |
722 | } |
723 | *line = '\0'; | |
724 | return 0; | |
725 | } | |
726 | ||
c0d3fb39 TI |
727 | EXPORT_SYMBOL(snd_info_get_line); |
728 | ||
1da177e4 | 729 | /** |
856def8a | 730 | * snd_info_get_str - parse a string token |
1da177e4 LT |
731 | * @dest: the buffer to store the string token |
732 | * @src: the original string | |
733 | * @len: the max. length of token - 1 | |
734 | * | |
735 | * Parses the original string and copy a token to the given | |
736 | * string buffer. | |
737 | * | |
738 | * Returns the updated pointer of the original string so that | |
739 | * it can be used for the next call. | |
740 | */ | |
4f7454a9 | 741 | const char *snd_info_get_str(char *dest, const char *src, int len) |
1da177e4 LT |
742 | { |
743 | int c; | |
744 | ||
745 | while (*src == ' ' || *src == '\t') | |
746 | src++; | |
747 | if (*src == '"' || *src == '\'') { | |
748 | c = *src++; | |
749 | while (--len > 0 && *src && *src != c) { | |
750 | *dest++ = *src++; | |
751 | } | |
752 | if (*src == c) | |
753 | src++; | |
754 | } else { | |
755 | while (--len > 0 && *src && *src != ' ' && *src != '\t') { | |
756 | *dest++ = *src++; | |
757 | } | |
758 | } | |
759 | *dest = 0; | |
760 | while (*src == ' ' || *src == '\t') | |
761 | src++; | |
762 | return src; | |
763 | } | |
764 | ||
c0d3fb39 TI |
765 | EXPORT_SYMBOL(snd_info_get_str); |
766 | ||
1da177e4 LT |
767 | /** |
768 | * snd_info_create_entry - create an info entry | |
769 | * @name: the proc file name | |
770 | * | |
771 | * Creates an info entry with the given file name and initializes as | |
772 | * the default state. | |
773 | * | |
774 | * Usually called from other functions such as | |
775 | * snd_info_create_card_entry(). | |
776 | * | |
777 | * Returns the pointer of the new instance, or NULL on failure. | |
778 | */ | |
24c1f931 | 779 | static struct snd_info_entry *snd_info_create_entry(const char *name) |
1da177e4 | 780 | { |
24c1f931 | 781 | struct snd_info_entry *entry; |
ca2c0966 | 782 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
1da177e4 LT |
783 | if (entry == NULL) |
784 | return NULL; | |
543537bd | 785 | entry->name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
786 | if (entry->name == NULL) { |
787 | kfree(entry); | |
788 | return NULL; | |
789 | } | |
790 | entry->mode = S_IFREG | S_IRUGO; | |
791 | entry->content = SNDRV_INFO_CONTENT_TEXT; | |
1a60d4c5 | 792 | mutex_init(&entry->access); |
746d4a02 TI |
793 | INIT_LIST_HEAD(&entry->children); |
794 | INIT_LIST_HEAD(&entry->list); | |
1da177e4 LT |
795 | return entry; |
796 | } | |
797 | ||
798 | /** | |
799 | * snd_info_create_module_entry - create an info entry for the given module | |
800 | * @module: the module pointer | |
801 | * @name: the file name | |
802 | * @parent: the parent directory | |
803 | * | |
804 | * Creates a new info entry and assigns it to the given module. | |
805 | * | |
806 | * Returns the pointer of the new instance, or NULL on failure. | |
807 | */ | |
24c1f931 | 808 | struct snd_info_entry *snd_info_create_module_entry(struct module * module, |
1da177e4 | 809 | const char *name, |
24c1f931 | 810 | struct snd_info_entry *parent) |
1da177e4 | 811 | { |
24c1f931 | 812 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
813 | if (entry) { |
814 | entry->module = module; | |
815 | entry->parent = parent; | |
816 | } | |
817 | return entry; | |
818 | } | |
819 | ||
c0d3fb39 TI |
820 | EXPORT_SYMBOL(snd_info_create_module_entry); |
821 | ||
1da177e4 LT |
822 | /** |
823 | * snd_info_create_card_entry - create an info entry for the given card | |
824 | * @card: the card instance | |
825 | * @name: the file name | |
826 | * @parent: the parent directory | |
827 | * | |
828 | * Creates a new info entry and assigns it to the given card. | |
829 | * | |
830 | * Returns the pointer of the new instance, or NULL on failure. | |
831 | */ | |
24c1f931 | 832 | struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, |
1da177e4 | 833 | const char *name, |
24c1f931 | 834 | struct snd_info_entry * parent) |
1da177e4 | 835 | { |
24c1f931 | 836 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
837 | if (entry) { |
838 | entry->module = card->module; | |
839 | entry->card = card; | |
840 | entry->parent = parent; | |
841 | } | |
842 | return entry; | |
843 | } | |
844 | ||
c0d3fb39 TI |
845 | EXPORT_SYMBOL(snd_info_create_card_entry); |
846 | ||
746d4a02 | 847 | static void snd_info_disconnect(struct snd_info_entry *entry) |
1da177e4 | 848 | { |
746d4a02 TI |
849 | struct list_head *p, *n; |
850 | struct proc_dir_entry *root; | |
1da177e4 | 851 | |
746d4a02 TI |
852 | list_for_each_safe(p, n, &entry->children) { |
853 | snd_info_disconnect(list_entry(p, struct snd_info_entry, list)); | |
854 | } | |
855 | ||
856 | if (! entry->p) | |
857 | return; | |
858 | list_del_init(&entry->list); | |
859 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; | |
7eaa943c | 860 | snd_BUG_ON(!root); |
746d4a02 TI |
861 | snd_remove_proc_entry(root, entry->p); |
862 | entry->p = NULL; | |
1da177e4 LT |
863 | } |
864 | ||
746d4a02 | 865 | static int snd_info_dev_free_entry(struct snd_device *device) |
1da177e4 | 866 | { |
24c1f931 | 867 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 868 | snd_info_free_entry(entry); |
1da177e4 LT |
869 | return 0; |
870 | } | |
871 | ||
746d4a02 | 872 | static int snd_info_dev_register_entry(struct snd_device *device) |
1da177e4 | 873 | { |
24c1f931 | 874 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 875 | return snd_info_register(entry); |
1da177e4 LT |
876 | } |
877 | ||
878 | /** | |
879 | * snd_card_proc_new - create an info entry for the given card | |
880 | * @card: the card instance | |
881 | * @name: the file name | |
882 | * @entryp: the pointer to store the new info entry | |
883 | * | |
884 | * Creates a new info entry and assigns it to the given card. | |
885 | * Unlike snd_info_create_card_entry(), this function registers the | |
886 | * info entry as an ALSA device component, so that it can be | |
887 | * unregistered/released without explicit call. | |
888 | * Also, you don't have to register this entry via snd_info_register(), | |
889 | * since this will be registered by snd_card_register() automatically. | |
890 | * | |
891 | * The parent is assumed as card->proc_root. | |
892 | * | |
893 | * For releasing this entry, use snd_device_free() instead of | |
894 | * snd_info_free_entry(). | |
895 | * | |
896 | * Returns zero if successful, or a negative error code on failure. | |
897 | */ | |
24c1f931 TI |
898 | int snd_card_proc_new(struct snd_card *card, const char *name, |
899 | struct snd_info_entry **entryp) | |
1da177e4 | 900 | { |
24c1f931 | 901 | static struct snd_device_ops ops = { |
1da177e4 LT |
902 | .dev_free = snd_info_dev_free_entry, |
903 | .dev_register = snd_info_dev_register_entry, | |
746d4a02 | 904 | /* disconnect is done via snd_info_card_disconnect() */ |
1da177e4 | 905 | }; |
24c1f931 | 906 | struct snd_info_entry *entry; |
1da177e4 LT |
907 | int err; |
908 | ||
909 | entry = snd_info_create_card_entry(card, name, card->proc_root); | |
910 | if (! entry) | |
911 | return -ENOMEM; | |
912 | if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) { | |
913 | snd_info_free_entry(entry); | |
914 | return err; | |
915 | } | |
916 | if (entryp) | |
917 | *entryp = entry; | |
918 | return 0; | |
919 | } | |
920 | ||
c0d3fb39 TI |
921 | EXPORT_SYMBOL(snd_card_proc_new); |
922 | ||
1da177e4 LT |
923 | /** |
924 | * snd_info_free_entry - release the info entry | |
925 | * @entry: the info entry | |
926 | * | |
927 | * Releases the info entry. Don't call this after registered. | |
928 | */ | |
24c1f931 | 929 | void snd_info_free_entry(struct snd_info_entry * entry) |
1da177e4 LT |
930 | { |
931 | if (entry == NULL) | |
932 | return; | |
746d4a02 TI |
933 | if (entry->p) { |
934 | mutex_lock(&info_mutex); | |
935 | snd_info_disconnect(entry); | |
936 | mutex_unlock(&info_mutex); | |
937 | } | |
1da177e4 LT |
938 | kfree(entry->name); |
939 | if (entry->private_free) | |
940 | entry->private_free(entry); | |
941 | kfree(entry); | |
942 | } | |
943 | ||
c0d3fb39 TI |
944 | EXPORT_SYMBOL(snd_info_free_entry); |
945 | ||
1da177e4 LT |
946 | /** |
947 | * snd_info_register - register the info entry | |
948 | * @entry: the info entry | |
949 | * | |
950 | * Registers the proc info entry. | |
951 | * | |
952 | * Returns zero if successful, or a negative error code on failure. | |
953 | */ | |
24c1f931 | 954 | int snd_info_register(struct snd_info_entry * entry) |
1da177e4 LT |
955 | { |
956 | struct proc_dir_entry *root, *p = NULL; | |
957 | ||
7eaa943c TI |
958 | if (snd_BUG_ON(!entry)) |
959 | return -ENXIO; | |
1da177e4 | 960 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; |
1a60d4c5 | 961 | mutex_lock(&info_mutex); |
99b76233 | 962 | p = create_proc_entry(entry->name, entry->mode, root); |
1da177e4 | 963 | if (!p) { |
1a60d4c5 | 964 | mutex_unlock(&info_mutex); |
1da177e4 LT |
965 | return -ENOMEM; |
966 | } | |
1da177e4 LT |
967 | if (!S_ISDIR(entry->mode)) |
968 | p->proc_fops = &snd_info_entry_operations; | |
969 | p->size = entry->size; | |
970 | p->data = entry; | |
971 | entry->p = p; | |
746d4a02 TI |
972 | if (entry->parent) |
973 | list_add_tail(&entry->list, &entry->parent->children); | |
1a60d4c5 | 974 | mutex_unlock(&info_mutex); |
1da177e4 LT |
975 | return 0; |
976 | } | |
977 | ||
c0d3fb39 TI |
978 | EXPORT_SYMBOL(snd_info_register); |
979 | ||
1da177e4 LT |
980 | /* |
981 | ||
982 | */ | |
983 | ||
6581f4e7 | 984 | static struct snd_info_entry *snd_info_version_entry; |
1da177e4 | 985 | |
24c1f931 | 986 | static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) |
1da177e4 LT |
987 | { |
988 | snd_iprintf(buffer, | |
42662748 JK |
989 | "Advanced Linux Sound Architecture Driver Version k%s.\n", |
990 | init_utsname()->release); | |
1da177e4 LT |
991 | } |
992 | ||
993 | static int __init snd_info_version_init(void) | |
994 | { | |
24c1f931 | 995 | struct snd_info_entry *entry; |
1da177e4 LT |
996 | |
997 | entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL); | |
998 | if (entry == NULL) | |
999 | return -ENOMEM; | |
1da177e4 LT |
1000 | entry->c.text.read = snd_info_version_read; |
1001 | if (snd_info_register(entry) < 0) { | |
1002 | snd_info_free_entry(entry); | |
1003 | return -ENOMEM; | |
1004 | } | |
1005 | snd_info_version_entry = entry; | |
1006 | return 0; | |
1007 | } | |
1008 | ||
1009 | static int __exit snd_info_version_done(void) | |
1010 | { | |
746d4a02 | 1011 | snd_info_free_entry(snd_info_version_entry); |
1da177e4 LT |
1012 | return 0; |
1013 | } | |
1014 | ||
1015 | #endif /* CONFIG_PROC_FS */ |