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 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 | int mode, err; |
314 | ||
1a60d4c5 | 315 | mutex_lock(&info_mutex); |
d9dda78b | 316 | entry = PDE_DATA(inode); |
746d4a02 | 317 | if (entry == NULL || ! entry->p) { |
1a60d4c5 | 318 | mutex_unlock(&info_mutex); |
1da177e4 LT |
319 | return -ENODEV; |
320 | } | |
321 | if (!try_module_get(entry->module)) { | |
322 | err = -EFAULT; | |
323 | goto __error1; | |
324 | } | |
325 | mode = file->f_flags & O_ACCMODE; | |
326 | if (mode == O_RDONLY || mode == O_RDWR) { | |
7e4eeec8 | 327 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
1da177e4 LT |
328 | entry->c.ops->read == NULL)) { |
329 | err = -ENODEV; | |
330 | goto __error; | |
331 | } | |
332 | } | |
333 | if (mode == O_WRONLY || mode == O_RDWR) { | |
7e4eeec8 | 334 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
1da177e4 LT |
335 | entry->c.ops->write == NULL)) { |
336 | err = -ENODEV; | |
337 | goto __error; | |
338 | } | |
339 | } | |
ca2c0966 | 340 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
341 | if (data == NULL) { |
342 | err = -ENOMEM; | |
343 | goto __error; | |
344 | } | |
345 | data->entry = entry; | |
346 | switch (entry->content) { | |
347 | case SNDRV_INFO_CONTENT_TEXT: | |
348 | if (mode == O_RDONLY || mode == O_RDWR) { | |
ca2c0966 | 349 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
7e4eeec8 TI |
350 | if (buffer == NULL) |
351 | goto __nomem; | |
1da177e4 | 352 | data->rbuffer = buffer; |
7e4eeec8 TI |
353 | buffer->len = PAGE_SIZE; |
354 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); | |
355 | if (buffer->buffer == NULL) | |
356 | goto __nomem; | |
1da177e4 LT |
357 | } |
358 | if (mode == O_WRONLY || mode == O_RDWR) { | |
ca2c0966 | 359 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
7e4eeec8 TI |
360 | if (buffer == NULL) |
361 | goto __nomem; | |
1da177e4 | 362 | data->wbuffer = buffer; |
7e4eeec8 TI |
363 | buffer->len = PAGE_SIZE; |
364 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); | |
365 | if (buffer->buffer == NULL) | |
366 | goto __nomem; | |
1da177e4 LT |
367 | } |
368 | break; | |
369 | case SNDRV_INFO_CONTENT_DATA: /* data */ | |
370 | if (entry->c.ops->open) { | |
371 | if ((err = entry->c.ops->open(entry, mode, | |
372 | &data->file_private_data)) < 0) { | |
373 | kfree(data); | |
374 | goto __error; | |
375 | } | |
376 | } | |
377 | break; | |
378 | } | |
379 | file->private_data = data; | |
1a60d4c5 | 380 | mutex_unlock(&info_mutex); |
1da177e4 LT |
381 | if (entry->content == SNDRV_INFO_CONTENT_TEXT && |
382 | (mode == O_RDONLY || mode == O_RDWR)) { | |
383 | if (entry->c.text.read) { | |
1a60d4c5 | 384 | mutex_lock(&entry->access); |
1da177e4 | 385 | entry->c.text.read(entry, data->rbuffer); |
1a60d4c5 | 386 | mutex_unlock(&entry->access); |
1da177e4 LT |
387 | } |
388 | } | |
389 | return 0; | |
390 | ||
7e4eeec8 TI |
391 | __nomem: |
392 | if (data->rbuffer) { | |
393 | kfree(data->rbuffer->buffer); | |
394 | kfree(data->rbuffer); | |
395 | } | |
396 | if (data->wbuffer) { | |
397 | kfree(data->wbuffer->buffer); | |
398 | kfree(data->wbuffer); | |
399 | } | |
400 | kfree(data); | |
401 | err = -ENOMEM; | |
1da177e4 LT |
402 | __error: |
403 | module_put(entry->module); | |
404 | __error1: | |
1a60d4c5 | 405 | mutex_unlock(&info_mutex); |
1da177e4 LT |
406 | return err; |
407 | } | |
408 | ||
409 | static int snd_info_entry_release(struct inode *inode, struct file *file) | |
410 | { | |
24c1f931 TI |
411 | struct snd_info_entry *entry; |
412 | struct snd_info_private_data *data; | |
1da177e4 LT |
413 | int mode; |
414 | ||
415 | mode = file->f_flags & O_ACCMODE; | |
416 | data = file->private_data; | |
417 | entry = data->entry; | |
418 | switch (entry->content) { | |
419 | case SNDRV_INFO_CONTENT_TEXT: | |
7e4eeec8 TI |
420 | if (data->rbuffer) { |
421 | kfree(data->rbuffer->buffer); | |
1da177e4 LT |
422 | kfree(data->rbuffer); |
423 | } | |
7e4eeec8 | 424 | if (data->wbuffer) { |
1da177e4 LT |
425 | if (entry->c.text.write) { |
426 | entry->c.text.write(entry, data->wbuffer); | |
427 | if (data->wbuffer->error) { | |
428 | snd_printk(KERN_WARNING "data write error to %s (%i)\n", | |
429 | entry->name, | |
430 | data->wbuffer->error); | |
431 | } | |
432 | } | |
7e4eeec8 | 433 | kfree(data->wbuffer->buffer); |
1da177e4 LT |
434 | kfree(data->wbuffer); |
435 | } | |
436 | break; | |
437 | case SNDRV_INFO_CONTENT_DATA: | |
438 | if (entry->c.ops->release) | |
439 | entry->c.ops->release(entry, mode, | |
440 | data->file_private_data); | |
441 | break; | |
442 | } | |
443 | module_put(entry->module); | |
444 | kfree(data); | |
445 | return 0; | |
446 | } | |
447 | ||
448 | static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait) | |
449 | { | |
24c1f931 | 450 | struct snd_info_private_data *data; |
1da177e4 LT |
451 | struct snd_info_entry *entry; |
452 | unsigned int mask; | |
453 | ||
454 | data = file->private_data; | |
455 | if (data == NULL) | |
456 | return 0; | |
457 | entry = data->entry; | |
458 | mask = 0; | |
459 | switch (entry->content) { | |
460 | case SNDRV_INFO_CONTENT_DATA: | |
461 | if (entry->c.ops->poll) | |
462 | return entry->c.ops->poll(entry, | |
463 | data->file_private_data, | |
464 | file, wait); | |
465 | if (entry->c.ops->read) | |
466 | mask |= POLLIN | POLLRDNORM; | |
467 | if (entry->c.ops->write) | |
468 | mask |= POLLOUT | POLLWRNORM; | |
469 | break; | |
470 | } | |
471 | return mask; | |
472 | } | |
473 | ||
d99e9889 IM |
474 | static long snd_info_entry_ioctl(struct file *file, unsigned int cmd, |
475 | unsigned long arg) | |
1da177e4 | 476 | { |
24c1f931 | 477 | struct snd_info_private_data *data; |
1da177e4 LT |
478 | struct snd_info_entry *entry; |
479 | ||
480 | data = file->private_data; | |
481 | if (data == NULL) | |
482 | return 0; | |
483 | entry = data->entry; | |
484 | switch (entry->content) { | |
485 | case SNDRV_INFO_CONTENT_DATA: | |
486 | if (entry->c.ops->ioctl) | |
487 | return entry->c.ops->ioctl(entry, | |
488 | data->file_private_data, | |
489 | file, cmd, arg); | |
490 | break; | |
491 | } | |
492 | return -ENOTTY; | |
493 | } | |
494 | ||
1da177e4 LT |
495 | static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma) |
496 | { | |
496ad9aa | 497 | struct inode *inode = file_inode(file); |
24c1f931 | 498 | struct snd_info_private_data *data; |
1da177e4 LT |
499 | struct snd_info_entry *entry; |
500 | ||
501 | data = file->private_data; | |
502 | if (data == NULL) | |
503 | return 0; | |
504 | entry = data->entry; | |
505 | switch (entry->content) { | |
506 | case SNDRV_INFO_CONTENT_DATA: | |
507 | if (entry->c.ops->mmap) | |
508 | return entry->c.ops->mmap(entry, | |
509 | data->file_private_data, | |
510 | inode, file, vma); | |
511 | break; | |
512 | } | |
513 | return -ENXIO; | |
514 | } | |
515 | ||
9c2e08c5 | 516 | static const struct file_operations snd_info_entry_operations = |
1da177e4 | 517 | { |
d99e9889 IM |
518 | .owner = THIS_MODULE, |
519 | .llseek = snd_info_entry_llseek, | |
520 | .read = snd_info_entry_read, | |
521 | .write = snd_info_entry_write, | |
522 | .poll = snd_info_entry_poll, | |
523 | .unlocked_ioctl = snd_info_entry_ioctl, | |
524 | .mmap = snd_info_entry_mmap, | |
525 | .open = snd_info_entry_open, | |
526 | .release = snd_info_entry_release, | |
1da177e4 LT |
527 | }; |
528 | ||
1da177e4 LT |
529 | int __init snd_info_init(void) |
530 | { | |
531 | struct proc_dir_entry *p; | |
532 | ||
e55d92b9 | 533 | p = proc_mkdir("asound", NULL); |
1da177e4 LT |
534 | if (p == NULL) |
535 | return -ENOMEM; | |
536 | snd_proc_root = p; | |
537 | #ifdef CONFIG_SND_OSSEMUL | |
538 | { | |
24c1f931 | 539 | struct snd_info_entry *entry; |
1da177e4 LT |
540 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL) |
541 | return -ENOMEM; | |
542 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
543 | if (snd_info_register(entry) < 0) { | |
544 | snd_info_free_entry(entry); | |
545 | return -ENOMEM; | |
546 | } | |
547 | snd_oss_root = entry; | |
548 | } | |
549 | #endif | |
550 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
551 | { | |
24c1f931 | 552 | struct snd_info_entry *entry; |
1da177e4 LT |
553 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL) |
554 | return -ENOMEM; | |
555 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
556 | if (snd_info_register(entry) < 0) { | |
557 | snd_info_free_entry(entry); | |
558 | return -ENOMEM; | |
559 | } | |
560 | snd_seq_root = entry; | |
561 | } | |
562 | #endif | |
563 | snd_info_version_init(); | |
1da177e4 LT |
564 | snd_minor_info_init(); |
565 | snd_minor_info_oss_init(); | |
566 | snd_card_info_init(); | |
567 | return 0; | |
568 | } | |
569 | ||
570 | int __exit snd_info_done(void) | |
571 | { | |
572 | snd_card_info_done(); | |
573 | snd_minor_info_oss_done(); | |
574 | snd_minor_info_done(); | |
1da177e4 LT |
575 | snd_info_version_done(); |
576 | if (snd_proc_root) { | |
577 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
746d4a02 | 578 | snd_info_free_entry(snd_seq_root); |
1da177e4 LT |
579 | #endif |
580 | #ifdef CONFIG_SND_OSSEMUL | |
746d4a02 | 581 | snd_info_free_entry(snd_oss_root); |
1da177e4 | 582 | #endif |
c74c120a | 583 | snd_remove_proc_entry(NULL, snd_proc_root); |
1da177e4 LT |
584 | } |
585 | return 0; | |
586 | } | |
587 | ||
588 | /* | |
589 | ||
590 | */ | |
591 | ||
592 | ||
593 | /* | |
594 | * create a card proc file | |
595 | * called from init.c | |
596 | */ | |
24c1f931 | 597 | int snd_info_card_create(struct snd_card *card) |
1da177e4 LT |
598 | { |
599 | char str[8]; | |
24c1f931 | 600 | struct snd_info_entry *entry; |
1da177e4 | 601 | |
7eaa943c TI |
602 | if (snd_BUG_ON(!card)) |
603 | return -ENXIO; | |
1da177e4 LT |
604 | |
605 | sprintf(str, "card%i", card->number); | |
606 | if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL) | |
607 | return -ENOMEM; | |
608 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
609 | if (snd_info_register(entry) < 0) { | |
610 | snd_info_free_entry(entry); | |
611 | return -ENOMEM; | |
612 | } | |
613 | card->proc_root = entry; | |
614 | return 0; | |
615 | } | |
616 | ||
617 | /* | |
618 | * register the card proc file | |
619 | * called from init.c | |
620 | */ | |
24c1f931 | 621 | int snd_info_card_register(struct snd_card *card) |
1da177e4 LT |
622 | { |
623 | struct proc_dir_entry *p; | |
624 | ||
7eaa943c TI |
625 | if (snd_BUG_ON(!card)) |
626 | return -ENXIO; | |
1da177e4 LT |
627 | |
628 | if (!strcmp(card->id, card->proc_root->name)) | |
629 | return 0; | |
630 | ||
631 | p = proc_symlink(card->id, snd_proc_root, card->proc_root->name); | |
632 | if (p == NULL) | |
633 | return -ENOMEM; | |
634 | card->proc_root_link = p; | |
635 | return 0; | |
636 | } | |
637 | ||
c2eb9c4e JK |
638 | /* |
639 | * called on card->id change | |
640 | */ | |
641 | void snd_info_card_id_change(struct snd_card *card) | |
642 | { | |
643 | mutex_lock(&info_mutex); | |
644 | if (card->proc_root_link) { | |
645 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); | |
646 | card->proc_root_link = NULL; | |
647 | } | |
648 | if (strcmp(card->id, card->proc_root->name)) | |
649 | card->proc_root_link = proc_symlink(card->id, | |
650 | snd_proc_root, | |
651 | card->proc_root->name); | |
652 | mutex_unlock(&info_mutex); | |
653 | } | |
654 | ||
1da177e4 LT |
655 | /* |
656 | * de-register the card proc file | |
657 | * called from init.c | |
658 | */ | |
746d4a02 | 659 | void snd_info_card_disconnect(struct snd_card *card) |
1da177e4 | 660 | { |
7eaa943c TI |
661 | if (!card) |
662 | return; | |
746d4a02 | 663 | mutex_lock(&info_mutex); |
1da177e4 LT |
664 | if (card->proc_root_link) { |
665 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); | |
666 | card->proc_root_link = NULL; | |
667 | } | |
746d4a02 TI |
668 | if (card->proc_root) |
669 | snd_info_disconnect(card->proc_root); | |
670 | mutex_unlock(&info_mutex); | |
671 | } | |
672 | ||
673 | /* | |
674 | * release the card proc file resources | |
675 | * called from init.c | |
676 | */ | |
677 | int snd_info_card_free(struct snd_card *card) | |
678 | { | |
7eaa943c TI |
679 | if (!card) |
680 | return 0; | |
746d4a02 TI |
681 | snd_info_free_entry(card->proc_root); |
682 | card->proc_root = NULL; | |
1da177e4 LT |
683 | return 0; |
684 | } | |
685 | ||
686 | ||
687 | /** | |
688 | * snd_info_get_line - read one line from the procfs buffer | |
689 | * @buffer: the procfs buffer | |
690 | * @line: the buffer to store | |
691 | * @len: the max. buffer size - 1 | |
692 | * | |
693 | * Reads one line from the buffer and stores the string. | |
694 | * | |
695 | * Returns zero if successful, or 1 if error or EOF. | |
696 | */ | |
24c1f931 | 697 | int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) |
1da177e4 LT |
698 | { |
699 | int c = -1; | |
700 | ||
701 | if (len <= 0 || buffer->stop || buffer->error) | |
702 | return 1; | |
703 | while (--len > 0) { | |
7e4eeec8 | 704 | c = buffer->buffer[buffer->curr++]; |
1da177e4 | 705 | if (c == '\n') { |
7e4eeec8 | 706 | if (buffer->curr >= buffer->size) |
1da177e4 | 707 | buffer->stop = 1; |
1da177e4 LT |
708 | break; |
709 | } | |
710 | *line++ = c; | |
7e4eeec8 | 711 | if (buffer->curr >= buffer->size) { |
1da177e4 LT |
712 | buffer->stop = 1; |
713 | break; | |
714 | } | |
715 | } | |
716 | while (c != '\n' && !buffer->stop) { | |
7e4eeec8 TI |
717 | c = buffer->buffer[buffer->curr++]; |
718 | if (buffer->curr >= buffer->size) | |
1da177e4 | 719 | buffer->stop = 1; |
1da177e4 LT |
720 | } |
721 | *line = '\0'; | |
722 | return 0; | |
723 | } | |
724 | ||
c0d3fb39 TI |
725 | EXPORT_SYMBOL(snd_info_get_line); |
726 | ||
1da177e4 | 727 | /** |
856def8a | 728 | * snd_info_get_str - parse a string token |
1da177e4 LT |
729 | * @dest: the buffer to store the string token |
730 | * @src: the original string | |
731 | * @len: the max. length of token - 1 | |
732 | * | |
733 | * Parses the original string and copy a token to the given | |
734 | * string buffer. | |
735 | * | |
736 | * Returns the updated pointer of the original string so that | |
737 | * it can be used for the next call. | |
738 | */ | |
4f7454a9 | 739 | const char *snd_info_get_str(char *dest, const char *src, int len) |
1da177e4 LT |
740 | { |
741 | int c; | |
742 | ||
743 | while (*src == ' ' || *src == '\t') | |
744 | src++; | |
745 | if (*src == '"' || *src == '\'') { | |
746 | c = *src++; | |
747 | while (--len > 0 && *src && *src != c) { | |
748 | *dest++ = *src++; | |
749 | } | |
750 | if (*src == c) | |
751 | src++; | |
752 | } else { | |
753 | while (--len > 0 && *src && *src != ' ' && *src != '\t') { | |
754 | *dest++ = *src++; | |
755 | } | |
756 | } | |
757 | *dest = 0; | |
758 | while (*src == ' ' || *src == '\t') | |
759 | src++; | |
760 | return src; | |
761 | } | |
762 | ||
c0d3fb39 TI |
763 | EXPORT_SYMBOL(snd_info_get_str); |
764 | ||
1da177e4 LT |
765 | /** |
766 | * snd_info_create_entry - create an info entry | |
767 | * @name: the proc file name | |
768 | * | |
769 | * Creates an info entry with the given file name and initializes as | |
770 | * the default state. | |
771 | * | |
772 | * Usually called from other functions such as | |
773 | * snd_info_create_card_entry(). | |
774 | * | |
775 | * Returns the pointer of the new instance, or NULL on failure. | |
776 | */ | |
24c1f931 | 777 | static struct snd_info_entry *snd_info_create_entry(const char *name) |
1da177e4 | 778 | { |
24c1f931 | 779 | struct snd_info_entry *entry; |
ca2c0966 | 780 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
1da177e4 LT |
781 | if (entry == NULL) |
782 | return NULL; | |
543537bd | 783 | entry->name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
784 | if (entry->name == NULL) { |
785 | kfree(entry); | |
786 | return NULL; | |
787 | } | |
788 | entry->mode = S_IFREG | S_IRUGO; | |
789 | entry->content = SNDRV_INFO_CONTENT_TEXT; | |
1a60d4c5 | 790 | mutex_init(&entry->access); |
746d4a02 TI |
791 | INIT_LIST_HEAD(&entry->children); |
792 | INIT_LIST_HEAD(&entry->list); | |
1da177e4 LT |
793 | return entry; |
794 | } | |
795 | ||
796 | /** | |
797 | * snd_info_create_module_entry - create an info entry for the given module | |
798 | * @module: the module pointer | |
799 | * @name: the file name | |
800 | * @parent: the parent directory | |
801 | * | |
802 | * Creates a new info entry and assigns it to the given module. | |
803 | * | |
804 | * Returns the pointer of the new instance, or NULL on failure. | |
805 | */ | |
24c1f931 | 806 | struct snd_info_entry *snd_info_create_module_entry(struct module * module, |
1da177e4 | 807 | const char *name, |
24c1f931 | 808 | struct snd_info_entry *parent) |
1da177e4 | 809 | { |
24c1f931 | 810 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
811 | if (entry) { |
812 | entry->module = module; | |
813 | entry->parent = parent; | |
814 | } | |
815 | return entry; | |
816 | } | |
817 | ||
c0d3fb39 TI |
818 | EXPORT_SYMBOL(snd_info_create_module_entry); |
819 | ||
1da177e4 LT |
820 | /** |
821 | * snd_info_create_card_entry - create an info entry for the given card | |
822 | * @card: the card instance | |
823 | * @name: the file name | |
824 | * @parent: the parent directory | |
825 | * | |
826 | * Creates a new info entry and assigns it to the given card. | |
827 | * | |
828 | * Returns the pointer of the new instance, or NULL on failure. | |
829 | */ | |
24c1f931 | 830 | struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, |
1da177e4 | 831 | const char *name, |
24c1f931 | 832 | struct snd_info_entry * parent) |
1da177e4 | 833 | { |
24c1f931 | 834 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
835 | if (entry) { |
836 | entry->module = card->module; | |
837 | entry->card = card; | |
838 | entry->parent = parent; | |
839 | } | |
840 | return entry; | |
841 | } | |
842 | ||
c0d3fb39 TI |
843 | EXPORT_SYMBOL(snd_info_create_card_entry); |
844 | ||
746d4a02 | 845 | static void snd_info_disconnect(struct snd_info_entry *entry) |
1da177e4 | 846 | { |
746d4a02 TI |
847 | struct list_head *p, *n; |
848 | struct proc_dir_entry *root; | |
1da177e4 | 849 | |
746d4a02 TI |
850 | list_for_each_safe(p, n, &entry->children) { |
851 | snd_info_disconnect(list_entry(p, struct snd_info_entry, list)); | |
852 | } | |
853 | ||
854 | if (! entry->p) | |
855 | return; | |
856 | list_del_init(&entry->list); | |
857 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; | |
7eaa943c | 858 | snd_BUG_ON(!root); |
746d4a02 TI |
859 | snd_remove_proc_entry(root, entry->p); |
860 | entry->p = NULL; | |
1da177e4 LT |
861 | } |
862 | ||
746d4a02 | 863 | static int snd_info_dev_free_entry(struct snd_device *device) |
1da177e4 | 864 | { |
24c1f931 | 865 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 866 | snd_info_free_entry(entry); |
1da177e4 LT |
867 | return 0; |
868 | } | |
869 | ||
746d4a02 | 870 | static int snd_info_dev_register_entry(struct snd_device *device) |
1da177e4 | 871 | { |
24c1f931 | 872 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 873 | return snd_info_register(entry); |
1da177e4 LT |
874 | } |
875 | ||
876 | /** | |
877 | * snd_card_proc_new - create an info entry for the given card | |
878 | * @card: the card instance | |
879 | * @name: the file name | |
880 | * @entryp: the pointer to store the new info entry | |
881 | * | |
882 | * Creates a new info entry and assigns it to the given card. | |
883 | * Unlike snd_info_create_card_entry(), this function registers the | |
884 | * info entry as an ALSA device component, so that it can be | |
885 | * unregistered/released without explicit call. | |
886 | * Also, you don't have to register this entry via snd_info_register(), | |
887 | * since this will be registered by snd_card_register() automatically. | |
888 | * | |
889 | * The parent is assumed as card->proc_root. | |
890 | * | |
891 | * For releasing this entry, use snd_device_free() instead of | |
892 | * snd_info_free_entry(). | |
893 | * | |
894 | * Returns zero if successful, or a negative error code on failure. | |
895 | */ | |
24c1f931 TI |
896 | int snd_card_proc_new(struct snd_card *card, const char *name, |
897 | struct snd_info_entry **entryp) | |
1da177e4 | 898 | { |
24c1f931 | 899 | static struct snd_device_ops ops = { |
1da177e4 LT |
900 | .dev_free = snd_info_dev_free_entry, |
901 | .dev_register = snd_info_dev_register_entry, | |
746d4a02 | 902 | /* disconnect is done via snd_info_card_disconnect() */ |
1da177e4 | 903 | }; |
24c1f931 | 904 | struct snd_info_entry *entry; |
1da177e4 LT |
905 | int err; |
906 | ||
907 | entry = snd_info_create_card_entry(card, name, card->proc_root); | |
908 | if (! entry) | |
909 | return -ENOMEM; | |
910 | if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) { | |
911 | snd_info_free_entry(entry); | |
912 | return err; | |
913 | } | |
914 | if (entryp) | |
915 | *entryp = entry; | |
916 | return 0; | |
917 | } | |
918 | ||
c0d3fb39 TI |
919 | EXPORT_SYMBOL(snd_card_proc_new); |
920 | ||
1da177e4 LT |
921 | /** |
922 | * snd_info_free_entry - release the info entry | |
923 | * @entry: the info entry | |
924 | * | |
925 | * Releases the info entry. Don't call this after registered. | |
926 | */ | |
24c1f931 | 927 | void snd_info_free_entry(struct snd_info_entry * entry) |
1da177e4 LT |
928 | { |
929 | if (entry == NULL) | |
930 | return; | |
746d4a02 TI |
931 | if (entry->p) { |
932 | mutex_lock(&info_mutex); | |
933 | snd_info_disconnect(entry); | |
934 | mutex_unlock(&info_mutex); | |
935 | } | |
1da177e4 LT |
936 | kfree(entry->name); |
937 | if (entry->private_free) | |
938 | entry->private_free(entry); | |
939 | kfree(entry); | |
940 | } | |
941 | ||
c0d3fb39 TI |
942 | EXPORT_SYMBOL(snd_info_free_entry); |
943 | ||
1da177e4 LT |
944 | /** |
945 | * snd_info_register - register the info entry | |
946 | * @entry: the info entry | |
947 | * | |
948 | * Registers the proc info entry. | |
949 | * | |
950 | * Returns zero if successful, or a negative error code on failure. | |
951 | */ | |
24c1f931 | 952 | int snd_info_register(struct snd_info_entry * entry) |
1da177e4 LT |
953 | { |
954 | struct proc_dir_entry *root, *p = NULL; | |
955 | ||
7eaa943c TI |
956 | if (snd_BUG_ON(!entry)) |
957 | return -ENXIO; | |
1da177e4 | 958 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; |
1a60d4c5 | 959 | mutex_lock(&info_mutex); |
aee0c612 AV |
960 | if (S_ISDIR(entry->mode)) { |
961 | p = proc_mkdir_mode(entry->name, entry->mode, root); | |
962 | if (!p) { | |
963 | mutex_unlock(&info_mutex); | |
964 | return -ENOMEM; | |
965 | } | |
966 | } else { | |
967 | p = proc_create_data(entry->name, entry->mode, root, | |
968 | &snd_info_entry_operations, entry); | |
969 | if (!p) { | |
970 | mutex_unlock(&info_mutex); | |
971 | return -ENOMEM; | |
972 | } | |
973 | p->size = entry->size; | |
1da177e4 | 974 | } |
1da177e4 | 975 | entry->p = p; |
746d4a02 TI |
976 | if (entry->parent) |
977 | list_add_tail(&entry->list, &entry->parent->children); | |
1a60d4c5 | 978 | mutex_unlock(&info_mutex); |
1da177e4 LT |
979 | return 0; |
980 | } | |
981 | ||
c0d3fb39 TI |
982 | EXPORT_SYMBOL(snd_info_register); |
983 | ||
1da177e4 LT |
984 | /* |
985 | ||
986 | */ | |
987 | ||
6581f4e7 | 988 | static struct snd_info_entry *snd_info_version_entry; |
1da177e4 | 989 | |
24c1f931 | 990 | static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) |
1da177e4 LT |
991 | { |
992 | snd_iprintf(buffer, | |
42662748 JK |
993 | "Advanced Linux Sound Architecture Driver Version k%s.\n", |
994 | init_utsname()->release); | |
1da177e4 LT |
995 | } |
996 | ||
997 | static int __init snd_info_version_init(void) | |
998 | { | |
24c1f931 | 999 | struct snd_info_entry *entry; |
1da177e4 LT |
1000 | |
1001 | entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL); | |
1002 | if (entry == NULL) | |
1003 | return -ENOMEM; | |
1da177e4 LT |
1004 | entry->c.text.read = snd_info_version_read; |
1005 | if (snd_info_register(entry) < 0) { | |
1006 | snd_info_free_entry(entry); | |
1007 | return -ENOMEM; | |
1008 | } | |
1009 | snd_info_version_entry = entry; | |
1010 | return 0; | |
1011 | } | |
1012 | ||
1013 | static int __exit snd_info_version_done(void) | |
1014 | { | |
746d4a02 | 1015 | snd_info_free_entry(snd_info_version_entry); |
1da177e4 LT |
1016 | return 0; |
1017 | } | |
1018 | ||
1019 | #endif /* CONFIG_PROC_FS */ |