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> |
1da177e4 LT |
27 | #include <sound/core.h> |
28 | #include <sound/minors.h> | |
29 | #include <sound/info.h> | |
30 | #include <sound/version.h> | |
31 | #include <linux/proc_fs.h> | |
1a60d4c5 | 32 | #include <linux/mutex.h> |
1da177e4 LT |
33 | #include <stdarg.h> |
34 | ||
35 | /* | |
36 | * | |
37 | */ | |
38 | ||
e28563cc TI |
39 | #ifdef CONFIG_PROC_FS |
40 | ||
1da177e4 LT |
41 | int snd_info_check_reserved_words(const char *str) |
42 | { | |
43 | static char *reserved[] = | |
44 | { | |
45 | "version", | |
46 | "meminfo", | |
47 | "memdebug", | |
48 | "detect", | |
49 | "devices", | |
50 | "oss", | |
51 | "cards", | |
52 | "timers", | |
53 | "synth", | |
54 | "pcm", | |
55 | "seq", | |
56 | NULL | |
57 | }; | |
58 | char **xstr = reserved; | |
59 | ||
60 | while (*xstr) { | |
61 | if (!strcmp(*xstr, str)) | |
62 | return 0; | |
63 | xstr++; | |
64 | } | |
65 | if (!strncmp(str, "card", 4)) | |
66 | return 0; | |
67 | return 1; | |
68 | } | |
69 | ||
1a60d4c5 | 70 | static DEFINE_MUTEX(info_mutex); |
1da177e4 | 71 | |
24c1f931 TI |
72 | struct snd_info_private_data { |
73 | struct snd_info_buffer *rbuffer; | |
74 | struct snd_info_buffer *wbuffer; | |
75 | struct snd_info_entry *entry; | |
1da177e4 | 76 | void *file_private_data; |
24c1f931 | 77 | }; |
1da177e4 LT |
78 | |
79 | static int snd_info_version_init(void); | |
80 | static int snd_info_version_done(void); | |
746d4a02 | 81 | static void snd_info_disconnect(struct snd_info_entry *entry); |
1da177e4 LT |
82 | |
83 | ||
7e4eeec8 TI |
84 | /* resize the proc r/w buffer */ |
85 | static int resize_info_buffer(struct snd_info_buffer *buffer, | |
86 | unsigned int nsize) | |
87 | { | |
88 | char *nbuf; | |
89 | ||
90 | nsize = PAGE_ALIGN(nsize); | |
9983aa62 | 91 | nbuf = krealloc(buffer->buffer, nsize, GFP_KERNEL); |
7e4eeec8 TI |
92 | if (! nbuf) |
93 | return -ENOMEM; | |
94 | ||
7e4eeec8 TI |
95 | buffer->buffer = nbuf; |
96 | buffer->len = nsize; | |
97 | return 0; | |
98 | } | |
99 | ||
1da177e4 LT |
100 | /** |
101 | * snd_iprintf - printf on the procfs buffer | |
102 | * @buffer: the procfs buffer | |
103 | * @fmt: the printf format | |
104 | * | |
105 | * Outputs the string on the procfs buffer just like printf(). | |
106 | * | |
107 | * Returns the size of output string. | |
108 | */ | |
4f7454a9 | 109 | int snd_iprintf(struct snd_info_buffer *buffer, const char *fmt, ...) |
1da177e4 LT |
110 | { |
111 | va_list args; | |
112 | int len, res; | |
7e4eeec8 | 113 | int err = 0; |
1da177e4 | 114 | |
f001c3ac | 115 | might_sleep(); |
1da177e4 LT |
116 | if (buffer->stop || buffer->error) |
117 | return 0; | |
118 | len = buffer->len - buffer->size; | |
119 | va_start(args, fmt); | |
7e4eeec8 | 120 | for (;;) { |
dbedca39 TI |
121 | va_list ap; |
122 | va_copy(ap, args); | |
123 | res = vsnprintf(buffer->buffer + buffer->curr, len, fmt, ap); | |
124 | va_end(ap); | |
7e4eeec8 TI |
125 | if (res < len) |
126 | break; | |
127 | err = resize_info_buffer(buffer, buffer->len + PAGE_SIZE); | |
128 | if (err < 0) | |
129 | break; | |
130 | len = buffer->len - buffer->size; | |
1da177e4 | 131 | } |
7e4eeec8 TI |
132 | va_end(args); |
133 | ||
134 | if (err < 0) | |
135 | return err; | |
1da177e4 LT |
136 | buffer->curr += res; |
137 | buffer->size += res; | |
138 | return res; | |
139 | } | |
140 | ||
c0d3fb39 TI |
141 | EXPORT_SYMBOL(snd_iprintf); |
142 | ||
1da177e4 LT |
143 | /* |
144 | ||
145 | */ | |
146 | ||
6581f4e7 TI |
147 | static struct proc_dir_entry *snd_proc_root; |
148 | struct snd_info_entry *snd_seq_root; | |
c0d3fb39 TI |
149 | EXPORT_SYMBOL(snd_seq_root); |
150 | ||
1da177e4 | 151 | #ifdef CONFIG_SND_OSSEMUL |
6581f4e7 | 152 | struct snd_info_entry *snd_oss_root; |
1da177e4 LT |
153 | #endif |
154 | ||
1da177e4 LT |
155 | static void snd_remove_proc_entry(struct proc_dir_entry *parent, |
156 | struct proc_dir_entry *de) | |
157 | { | |
158 | if (de) | |
159 | remove_proc_entry(de->name, parent); | |
160 | } | |
161 | ||
162 | static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig) | |
163 | { | |
24c1f931 | 164 | struct snd_info_private_data *data; |
1da177e4 | 165 | struct snd_info_entry *entry; |
73029e0f | 166 | loff_t ret = -EINVAL, size; |
1da177e4 LT |
167 | |
168 | data = file->private_data; | |
169 | entry = data->entry; | |
5b5cd553 | 170 | mutex_lock(&entry->access); |
73029e0f TI |
171 | if (entry->content == SNDRV_INFO_CONTENT_DATA && |
172 | entry->c.ops->llseek) { | |
173 | offset = entry->c.ops->llseek(entry, | |
174 | data->file_private_data, | |
175 | file, offset, orig); | |
176 | goto out; | |
177 | } | |
178 | if (entry->content == SNDRV_INFO_CONTENT_DATA) | |
179 | size = entry->size; | |
180 | else | |
181 | size = 0; | |
182 | switch (orig) { | |
183 | case SEEK_SET: | |
184 | break; | |
185 | case SEEK_CUR: | |
186 | offset += file->f_pos; | |
1da177e4 | 187 | break; |
73029e0f TI |
188 | case SEEK_END: |
189 | if (!size) | |
1da177e4 | 190 | goto out; |
73029e0f | 191 | offset += size; |
1da177e4 | 192 | break; |
73029e0f TI |
193 | default: |
194 | goto out; | |
1da177e4 | 195 | } |
73029e0f TI |
196 | if (offset < 0) |
197 | goto out; | |
198 | if (size && offset > size) | |
199 | offset = size; | |
200 | file->f_pos = offset; | |
201 | ret = offset; | |
202 | out: | |
5b5cd553 | 203 | mutex_unlock(&entry->access); |
1da177e4 LT |
204 | return ret; |
205 | } | |
206 | ||
207 | static ssize_t snd_info_entry_read(struct file *file, char __user *buffer, | |
208 | size_t count, loff_t * offset) | |
209 | { | |
24c1f931 | 210 | struct snd_info_private_data *data; |
1da177e4 | 211 | struct snd_info_entry *entry; |
24c1f931 | 212 | struct snd_info_buffer *buf; |
1da177e4 LT |
213 | size_t size = 0; |
214 | loff_t pos; | |
215 | ||
216 | data = file->private_data; | |
7eaa943c TI |
217 | if (snd_BUG_ON(!data)) |
218 | return -ENXIO; | |
1da177e4 LT |
219 | pos = *offset; |
220 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
221 | return -EIO; | |
222 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
223 | return -EIO; | |
224 | entry = data->entry; | |
225 | switch (entry->content) { | |
226 | case SNDRV_INFO_CONTENT_TEXT: | |
227 | buf = data->rbuffer; | |
228 | if (buf == NULL) | |
229 | return -EIO; | |
230 | if (pos >= buf->size) | |
231 | return 0; | |
232 | size = buf->size - pos; | |
233 | size = min(count, size); | |
234 | if (copy_to_user(buffer, buf->buffer + pos, size)) | |
235 | return -EFAULT; | |
236 | break; | |
237 | case SNDRV_INFO_CONTENT_DATA: | |
d97e1b78 TI |
238 | if (pos >= entry->size) |
239 | return 0; | |
240 | if (entry->c.ops->read) { | |
241 | size = entry->size - pos; | |
242 | size = min(count, size); | |
1da177e4 LT |
243 | size = entry->c.ops->read(entry, |
244 | data->file_private_data, | |
d97e1b78 TI |
245 | file, buffer, size, pos); |
246 | } | |
1da177e4 LT |
247 | break; |
248 | } | |
249 | if ((ssize_t) size > 0) | |
250 | *offset = pos + size; | |
251 | return size; | |
252 | } | |
253 | ||
254 | static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer, | |
255 | size_t count, loff_t * offset) | |
256 | { | |
24c1f931 | 257 | struct snd_info_private_data *data; |
1da177e4 | 258 | struct snd_info_entry *entry; |
24c1f931 | 259 | struct snd_info_buffer *buf; |
7e4eeec8 | 260 | ssize_t size = 0; |
1da177e4 LT |
261 | loff_t pos; |
262 | ||
263 | data = file->private_data; | |
7eaa943c TI |
264 | if (snd_BUG_ON(!data)) |
265 | return -ENXIO; | |
1da177e4 LT |
266 | entry = data->entry; |
267 | pos = *offset; | |
268 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
269 | return -EIO; | |
270 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
271 | return -EIO; | |
272 | switch (entry->content) { | |
273 | case SNDRV_INFO_CONTENT_TEXT: | |
274 | buf = data->wbuffer; | |
275 | if (buf == NULL) | |
276 | return -EIO; | |
f4a747f1 | 277 | mutex_lock(&entry->access); |
7e4eeec8 TI |
278 | if (pos + count >= buf->len) { |
279 | if (resize_info_buffer(buf, pos + count)) { | |
280 | mutex_unlock(&entry->access); | |
281 | return -ENOMEM; | |
282 | } | |
283 | } | |
284 | if (copy_from_user(buf->buffer + pos, buffer, count)) { | |
285 | mutex_unlock(&entry->access); | |
1da177e4 | 286 | return -EFAULT; |
7e4eeec8 TI |
287 | } |
288 | buf->size = pos + count; | |
289 | mutex_unlock(&entry->access); | |
290 | size = count; | |
1da177e4 LT |
291 | break; |
292 | case SNDRV_INFO_CONTENT_DATA: | |
d97e1b78 TI |
293 | if (entry->c.ops->write && count > 0) { |
294 | size_t maxsize = entry->size - pos; | |
295 | count = min(count, maxsize); | |
1da177e4 LT |
296 | size = entry->c.ops->write(entry, |
297 | data->file_private_data, | |
298 | file, buffer, count, pos); | |
d97e1b78 | 299 | } |
1da177e4 LT |
300 | break; |
301 | } | |
302 | if ((ssize_t) size > 0) | |
303 | *offset = pos + size; | |
304 | return size; | |
305 | } | |
306 | ||
307 | static int snd_info_entry_open(struct inode *inode, struct file *file) | |
308 | { | |
24c1f931 TI |
309 | struct snd_info_entry *entry; |
310 | struct snd_info_private_data *data; | |
311 | struct snd_info_buffer *buffer; | |
1da177e4 LT |
312 | struct proc_dir_entry *p; |
313 | int mode, err; | |
314 | ||
1a60d4c5 | 315 | mutex_lock(&info_mutex); |
1da177e4 | 316 | p = PDE(inode); |
24c1f931 | 317 | entry = p == NULL ? NULL : (struct snd_info_entry *)p->data; |
746d4a02 | 318 | if (entry == NULL || ! entry->p) { |
1a60d4c5 | 319 | mutex_unlock(&info_mutex); |
1da177e4 LT |
320 | return -ENODEV; |
321 | } | |
322 | if (!try_module_get(entry->module)) { | |
323 | err = -EFAULT; | |
324 | goto __error1; | |
325 | } | |
326 | mode = file->f_flags & O_ACCMODE; | |
327 | if (mode == O_RDONLY || mode == O_RDWR) { | |
7e4eeec8 | 328 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
1da177e4 LT |
329 | entry->c.ops->read == NULL)) { |
330 | err = -ENODEV; | |
331 | goto __error; | |
332 | } | |
333 | } | |
334 | if (mode == O_WRONLY || mode == O_RDWR) { | |
7e4eeec8 | 335 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
1da177e4 LT |
336 | entry->c.ops->write == NULL)) { |
337 | err = -ENODEV; | |
338 | goto __error; | |
339 | } | |
340 | } | |
ca2c0966 | 341 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
342 | if (data == NULL) { |
343 | err = -ENOMEM; | |
344 | goto __error; | |
345 | } | |
346 | data->entry = entry; | |
347 | switch (entry->content) { | |
348 | case SNDRV_INFO_CONTENT_TEXT: | |
349 | if (mode == O_RDONLY || mode == O_RDWR) { | |
ca2c0966 | 350 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
7e4eeec8 TI |
351 | if (buffer == NULL) |
352 | goto __nomem; | |
1da177e4 | 353 | data->rbuffer = buffer; |
7e4eeec8 TI |
354 | buffer->len = PAGE_SIZE; |
355 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); | |
356 | if (buffer->buffer == NULL) | |
357 | goto __nomem; | |
1da177e4 LT |
358 | } |
359 | if (mode == O_WRONLY || mode == O_RDWR) { | |
ca2c0966 | 360 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
7e4eeec8 TI |
361 | if (buffer == NULL) |
362 | goto __nomem; | |
1da177e4 | 363 | data->wbuffer = buffer; |
7e4eeec8 TI |
364 | buffer->len = PAGE_SIZE; |
365 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); | |
366 | if (buffer->buffer == NULL) | |
367 | goto __nomem; | |
1da177e4 LT |
368 | } |
369 | break; | |
370 | case SNDRV_INFO_CONTENT_DATA: /* data */ | |
371 | if (entry->c.ops->open) { | |
372 | if ((err = entry->c.ops->open(entry, mode, | |
373 | &data->file_private_data)) < 0) { | |
374 | kfree(data); | |
375 | goto __error; | |
376 | } | |
377 | } | |
378 | break; | |
379 | } | |
380 | file->private_data = data; | |
1a60d4c5 | 381 | mutex_unlock(&info_mutex); |
1da177e4 LT |
382 | if (entry->content == SNDRV_INFO_CONTENT_TEXT && |
383 | (mode == O_RDONLY || mode == O_RDWR)) { | |
384 | if (entry->c.text.read) { | |
1a60d4c5 | 385 | mutex_lock(&entry->access); |
1da177e4 | 386 | entry->c.text.read(entry, data->rbuffer); |
1a60d4c5 | 387 | mutex_unlock(&entry->access); |
1da177e4 LT |
388 | } |
389 | } | |
390 | return 0; | |
391 | ||
7e4eeec8 TI |
392 | __nomem: |
393 | if (data->rbuffer) { | |
394 | kfree(data->rbuffer->buffer); | |
395 | kfree(data->rbuffer); | |
396 | } | |
397 | if (data->wbuffer) { | |
398 | kfree(data->wbuffer->buffer); | |
399 | kfree(data->wbuffer); | |
400 | } | |
401 | kfree(data); | |
402 | err = -ENOMEM; | |
1da177e4 LT |
403 | __error: |
404 | module_put(entry->module); | |
405 | __error1: | |
1a60d4c5 | 406 | mutex_unlock(&info_mutex); |
1da177e4 LT |
407 | return err; |
408 | } | |
409 | ||
410 | static int snd_info_entry_release(struct inode *inode, struct file *file) | |
411 | { | |
24c1f931 TI |
412 | struct snd_info_entry *entry; |
413 | struct snd_info_private_data *data; | |
1da177e4 LT |
414 | int mode; |
415 | ||
416 | mode = file->f_flags & O_ACCMODE; | |
417 | data = file->private_data; | |
418 | entry = data->entry; | |
419 | switch (entry->content) { | |
420 | case SNDRV_INFO_CONTENT_TEXT: | |
7e4eeec8 TI |
421 | if (data->rbuffer) { |
422 | kfree(data->rbuffer->buffer); | |
1da177e4 LT |
423 | kfree(data->rbuffer); |
424 | } | |
7e4eeec8 | 425 | if (data->wbuffer) { |
1da177e4 LT |
426 | if (entry->c.text.write) { |
427 | entry->c.text.write(entry, data->wbuffer); | |
428 | if (data->wbuffer->error) { | |
429 | snd_printk(KERN_WARNING "data write error to %s (%i)\n", | |
430 | entry->name, | |
431 | data->wbuffer->error); | |
432 | } | |
433 | } | |
7e4eeec8 | 434 | kfree(data->wbuffer->buffer); |
1da177e4 LT |
435 | kfree(data->wbuffer); |
436 | } | |
437 | break; | |
438 | case SNDRV_INFO_CONTENT_DATA: | |
439 | if (entry->c.ops->release) | |
440 | entry->c.ops->release(entry, mode, | |
441 | data->file_private_data); | |
442 | break; | |
443 | } | |
444 | module_put(entry->module); | |
445 | kfree(data); | |
446 | return 0; | |
447 | } | |
448 | ||
449 | static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait) | |
450 | { | |
24c1f931 | 451 | struct snd_info_private_data *data; |
1da177e4 LT |
452 | struct snd_info_entry *entry; |
453 | unsigned int mask; | |
454 | ||
455 | data = file->private_data; | |
456 | if (data == NULL) | |
457 | return 0; | |
458 | entry = data->entry; | |
459 | mask = 0; | |
460 | switch (entry->content) { | |
461 | case SNDRV_INFO_CONTENT_DATA: | |
462 | if (entry->c.ops->poll) | |
463 | return entry->c.ops->poll(entry, | |
464 | data->file_private_data, | |
465 | file, wait); | |
466 | if (entry->c.ops->read) | |
467 | mask |= POLLIN | POLLRDNORM; | |
468 | if (entry->c.ops->write) | |
469 | mask |= POLLOUT | POLLWRNORM; | |
470 | break; | |
471 | } | |
472 | return mask; | |
473 | } | |
474 | ||
d99e9889 IM |
475 | static long snd_info_entry_ioctl(struct file *file, unsigned int cmd, |
476 | unsigned long arg) | |
1da177e4 | 477 | { |
24c1f931 | 478 | struct snd_info_private_data *data; |
1da177e4 LT |
479 | struct snd_info_entry *entry; |
480 | ||
481 | data = file->private_data; | |
482 | if (data == NULL) | |
483 | return 0; | |
484 | entry = data->entry; | |
485 | switch (entry->content) { | |
486 | case SNDRV_INFO_CONTENT_DATA: | |
487 | if (entry->c.ops->ioctl) | |
488 | return entry->c.ops->ioctl(entry, | |
489 | data->file_private_data, | |
490 | file, cmd, arg); | |
491 | break; | |
492 | } | |
493 | return -ENOTTY; | |
494 | } | |
495 | ||
1da177e4 LT |
496 | static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma) |
497 | { | |
7bc56323 | 498 | struct inode *inode = file->f_path.dentry->d_inode; |
24c1f931 | 499 | struct snd_info_private_data *data; |
1da177e4 LT |
500 | struct snd_info_entry *entry; |
501 | ||
502 | data = file->private_data; | |
503 | if (data == NULL) | |
504 | return 0; | |
505 | entry = data->entry; | |
506 | switch (entry->content) { | |
507 | case SNDRV_INFO_CONTENT_DATA: | |
508 | if (entry->c.ops->mmap) | |
509 | return entry->c.ops->mmap(entry, | |
510 | data->file_private_data, | |
511 | inode, file, vma); | |
512 | break; | |
513 | } | |
514 | return -ENXIO; | |
515 | } | |
516 | ||
9c2e08c5 | 517 | static const struct file_operations snd_info_entry_operations = |
1da177e4 | 518 | { |
d99e9889 IM |
519 | .owner = THIS_MODULE, |
520 | .llseek = snd_info_entry_llseek, | |
521 | .read = snd_info_entry_read, | |
522 | .write = snd_info_entry_write, | |
523 | .poll = snd_info_entry_poll, | |
524 | .unlocked_ioctl = snd_info_entry_ioctl, | |
525 | .mmap = snd_info_entry_mmap, | |
526 | .open = snd_info_entry_open, | |
527 | .release = snd_info_entry_release, | |
1da177e4 LT |
528 | }; |
529 | ||
1da177e4 LT |
530 | int __init snd_info_init(void) |
531 | { | |
532 | struct proc_dir_entry *p; | |
533 | ||
99b76233 | 534 | p = create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, NULL); |
1da177e4 LT |
535 | if (p == NULL) |
536 | return -ENOMEM; | |
537 | snd_proc_root = p; | |
538 | #ifdef CONFIG_SND_OSSEMUL | |
539 | { | |
24c1f931 | 540 | struct snd_info_entry *entry; |
1da177e4 LT |
541 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL) |
542 | return -ENOMEM; | |
543 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
544 | if (snd_info_register(entry) < 0) { | |
545 | snd_info_free_entry(entry); | |
546 | return -ENOMEM; | |
547 | } | |
548 | snd_oss_root = entry; | |
549 | } | |
550 | #endif | |
551 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
552 | { | |
24c1f931 | 553 | struct snd_info_entry *entry; |
1da177e4 LT |
554 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL) |
555 | return -ENOMEM; | |
556 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
557 | if (snd_info_register(entry) < 0) { | |
558 | snd_info_free_entry(entry); | |
559 | return -ENOMEM; | |
560 | } | |
561 | snd_seq_root = entry; | |
562 | } | |
563 | #endif | |
564 | snd_info_version_init(); | |
1da177e4 LT |
565 | snd_minor_info_init(); |
566 | snd_minor_info_oss_init(); | |
567 | snd_card_info_init(); | |
568 | return 0; | |
569 | } | |
570 | ||
571 | int __exit snd_info_done(void) | |
572 | { | |
573 | snd_card_info_done(); | |
574 | snd_minor_info_oss_done(); | |
575 | snd_minor_info_done(); | |
1da177e4 LT |
576 | snd_info_version_done(); |
577 | if (snd_proc_root) { | |
578 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
746d4a02 | 579 | snd_info_free_entry(snd_seq_root); |
1da177e4 LT |
580 | #endif |
581 | #ifdef CONFIG_SND_OSSEMUL | |
746d4a02 | 582 | snd_info_free_entry(snd_oss_root); |
1da177e4 | 583 | #endif |
c74c120a | 584 | snd_remove_proc_entry(NULL, snd_proc_root); |
1da177e4 LT |
585 | } |
586 | return 0; | |
587 | } | |
588 | ||
589 | /* | |
590 | ||
591 | */ | |
592 | ||
593 | ||
594 | /* | |
595 | * create a card proc file | |
596 | * called from init.c | |
597 | */ | |
24c1f931 | 598 | int snd_info_card_create(struct snd_card *card) |
1da177e4 LT |
599 | { |
600 | char str[8]; | |
24c1f931 | 601 | struct snd_info_entry *entry; |
1da177e4 | 602 | |
7eaa943c TI |
603 | if (snd_BUG_ON(!card)) |
604 | return -ENXIO; | |
1da177e4 LT |
605 | |
606 | sprintf(str, "card%i", card->number); | |
607 | if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL) | |
608 | return -ENOMEM; | |
609 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
610 | if (snd_info_register(entry) < 0) { | |
611 | snd_info_free_entry(entry); | |
612 | return -ENOMEM; | |
613 | } | |
614 | card->proc_root = entry; | |
615 | return 0; | |
616 | } | |
617 | ||
618 | /* | |
619 | * register the card proc file | |
620 | * called from init.c | |
621 | */ | |
24c1f931 | 622 | int snd_info_card_register(struct snd_card *card) |
1da177e4 LT |
623 | { |
624 | struct proc_dir_entry *p; | |
625 | ||
7eaa943c TI |
626 | if (snd_BUG_ON(!card)) |
627 | return -ENXIO; | |
1da177e4 LT |
628 | |
629 | if (!strcmp(card->id, card->proc_root->name)) | |
630 | return 0; | |
631 | ||
632 | p = proc_symlink(card->id, snd_proc_root, card->proc_root->name); | |
633 | if (p == NULL) | |
634 | return -ENOMEM; | |
635 | card->proc_root_link = p; | |
636 | return 0; | |
637 | } | |
638 | ||
c2eb9c4e JK |
639 | /* |
640 | * called on card->id change | |
641 | */ | |
642 | void snd_info_card_id_change(struct snd_card *card) | |
643 | { | |
644 | mutex_lock(&info_mutex); | |
645 | if (card->proc_root_link) { | |
646 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); | |
647 | card->proc_root_link = NULL; | |
648 | } | |
649 | if (strcmp(card->id, card->proc_root->name)) | |
650 | card->proc_root_link = proc_symlink(card->id, | |
651 | snd_proc_root, | |
652 | card->proc_root->name); | |
653 | mutex_unlock(&info_mutex); | |
654 | } | |
655 | ||
1da177e4 LT |
656 | /* |
657 | * de-register the card proc file | |
658 | * called from init.c | |
659 | */ | |
746d4a02 | 660 | void snd_info_card_disconnect(struct snd_card *card) |
1da177e4 | 661 | { |
7eaa943c TI |
662 | if (!card) |
663 | return; | |
746d4a02 | 664 | mutex_lock(&info_mutex); |
1da177e4 LT |
665 | if (card->proc_root_link) { |
666 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); | |
667 | card->proc_root_link = NULL; | |
668 | } | |
746d4a02 TI |
669 | if (card->proc_root) |
670 | snd_info_disconnect(card->proc_root); | |
671 | mutex_unlock(&info_mutex); | |
672 | } | |
673 | ||
674 | /* | |
675 | * release the card proc file resources | |
676 | * called from init.c | |
677 | */ | |
678 | int snd_info_card_free(struct snd_card *card) | |
679 | { | |
7eaa943c TI |
680 | if (!card) |
681 | return 0; | |
746d4a02 TI |
682 | snd_info_free_entry(card->proc_root); |
683 | card->proc_root = NULL; | |
1da177e4 LT |
684 | return 0; |
685 | } | |
686 | ||
687 | ||
688 | /** | |
689 | * snd_info_get_line - read one line from the procfs buffer | |
690 | * @buffer: the procfs buffer | |
691 | * @line: the buffer to store | |
692 | * @len: the max. buffer size - 1 | |
693 | * | |
694 | * Reads one line from the buffer and stores the string. | |
695 | * | |
696 | * Returns zero if successful, or 1 if error or EOF. | |
697 | */ | |
24c1f931 | 698 | int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) |
1da177e4 LT |
699 | { |
700 | int c = -1; | |
701 | ||
702 | if (len <= 0 || buffer->stop || buffer->error) | |
703 | return 1; | |
704 | while (--len > 0) { | |
7e4eeec8 | 705 | c = buffer->buffer[buffer->curr++]; |
1da177e4 | 706 | if (c == '\n') { |
7e4eeec8 | 707 | if (buffer->curr >= buffer->size) |
1da177e4 | 708 | buffer->stop = 1; |
1da177e4 LT |
709 | break; |
710 | } | |
711 | *line++ = c; | |
7e4eeec8 | 712 | if (buffer->curr >= buffer->size) { |
1da177e4 LT |
713 | buffer->stop = 1; |
714 | break; | |
715 | } | |
716 | } | |
717 | while (c != '\n' && !buffer->stop) { | |
7e4eeec8 TI |
718 | c = buffer->buffer[buffer->curr++]; |
719 | if (buffer->curr >= buffer->size) | |
1da177e4 | 720 | buffer->stop = 1; |
1da177e4 LT |
721 | } |
722 | *line = '\0'; | |
723 | return 0; | |
724 | } | |
725 | ||
c0d3fb39 TI |
726 | EXPORT_SYMBOL(snd_info_get_line); |
727 | ||
1da177e4 | 728 | /** |
856def8a | 729 | * snd_info_get_str - parse a string token |
1da177e4 LT |
730 | * @dest: the buffer to store the string token |
731 | * @src: the original string | |
732 | * @len: the max. length of token - 1 | |
733 | * | |
734 | * Parses the original string and copy a token to the given | |
735 | * string buffer. | |
736 | * | |
737 | * Returns the updated pointer of the original string so that | |
738 | * it can be used for the next call. | |
739 | */ | |
4f7454a9 | 740 | const char *snd_info_get_str(char *dest, const char *src, int len) |
1da177e4 LT |
741 | { |
742 | int c; | |
743 | ||
744 | while (*src == ' ' || *src == '\t') | |
745 | src++; | |
746 | if (*src == '"' || *src == '\'') { | |
747 | c = *src++; | |
748 | while (--len > 0 && *src && *src != c) { | |
749 | *dest++ = *src++; | |
750 | } | |
751 | if (*src == c) | |
752 | src++; | |
753 | } else { | |
754 | while (--len > 0 && *src && *src != ' ' && *src != '\t') { | |
755 | *dest++ = *src++; | |
756 | } | |
757 | } | |
758 | *dest = 0; | |
759 | while (*src == ' ' || *src == '\t') | |
760 | src++; | |
761 | return src; | |
762 | } | |
763 | ||
c0d3fb39 TI |
764 | EXPORT_SYMBOL(snd_info_get_str); |
765 | ||
1da177e4 LT |
766 | /** |
767 | * snd_info_create_entry - create an info entry | |
768 | * @name: the proc file name | |
769 | * | |
770 | * Creates an info entry with the given file name and initializes as | |
771 | * the default state. | |
772 | * | |
773 | * Usually called from other functions such as | |
774 | * snd_info_create_card_entry(). | |
775 | * | |
776 | * Returns the pointer of the new instance, or NULL on failure. | |
777 | */ | |
24c1f931 | 778 | static struct snd_info_entry *snd_info_create_entry(const char *name) |
1da177e4 | 779 | { |
24c1f931 | 780 | struct snd_info_entry *entry; |
ca2c0966 | 781 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
1da177e4 LT |
782 | if (entry == NULL) |
783 | return NULL; | |
543537bd | 784 | entry->name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
785 | if (entry->name == NULL) { |
786 | kfree(entry); | |
787 | return NULL; | |
788 | } | |
789 | entry->mode = S_IFREG | S_IRUGO; | |
790 | entry->content = SNDRV_INFO_CONTENT_TEXT; | |
1a60d4c5 | 791 | mutex_init(&entry->access); |
746d4a02 TI |
792 | INIT_LIST_HEAD(&entry->children); |
793 | INIT_LIST_HEAD(&entry->list); | |
1da177e4 LT |
794 | return entry; |
795 | } | |
796 | ||
797 | /** | |
798 | * snd_info_create_module_entry - create an info entry for the given module | |
799 | * @module: the module pointer | |
800 | * @name: the file name | |
801 | * @parent: the parent directory | |
802 | * | |
803 | * Creates a new info entry and assigns it to the given module. | |
804 | * | |
805 | * Returns the pointer of the new instance, or NULL on failure. | |
806 | */ | |
24c1f931 | 807 | struct snd_info_entry *snd_info_create_module_entry(struct module * module, |
1da177e4 | 808 | const char *name, |
24c1f931 | 809 | struct snd_info_entry *parent) |
1da177e4 | 810 | { |
24c1f931 | 811 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
812 | if (entry) { |
813 | entry->module = module; | |
814 | entry->parent = parent; | |
815 | } | |
816 | return entry; | |
817 | } | |
818 | ||
c0d3fb39 TI |
819 | EXPORT_SYMBOL(snd_info_create_module_entry); |
820 | ||
1da177e4 LT |
821 | /** |
822 | * snd_info_create_card_entry - create an info entry for the given card | |
823 | * @card: the card instance | |
824 | * @name: the file name | |
825 | * @parent: the parent directory | |
826 | * | |
827 | * Creates a new info entry and assigns it to the given card. | |
828 | * | |
829 | * Returns the pointer of the new instance, or NULL on failure. | |
830 | */ | |
24c1f931 | 831 | struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, |
1da177e4 | 832 | const char *name, |
24c1f931 | 833 | struct snd_info_entry * parent) |
1da177e4 | 834 | { |
24c1f931 | 835 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
836 | if (entry) { |
837 | entry->module = card->module; | |
838 | entry->card = card; | |
839 | entry->parent = parent; | |
840 | } | |
841 | return entry; | |
842 | } | |
843 | ||
c0d3fb39 TI |
844 | EXPORT_SYMBOL(snd_info_create_card_entry); |
845 | ||
746d4a02 | 846 | static void snd_info_disconnect(struct snd_info_entry *entry) |
1da177e4 | 847 | { |
746d4a02 TI |
848 | struct list_head *p, *n; |
849 | struct proc_dir_entry *root; | |
1da177e4 | 850 | |
746d4a02 TI |
851 | list_for_each_safe(p, n, &entry->children) { |
852 | snd_info_disconnect(list_entry(p, struct snd_info_entry, list)); | |
853 | } | |
854 | ||
855 | if (! entry->p) | |
856 | return; | |
857 | list_del_init(&entry->list); | |
858 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; | |
7eaa943c | 859 | snd_BUG_ON(!root); |
746d4a02 TI |
860 | snd_remove_proc_entry(root, entry->p); |
861 | entry->p = NULL; | |
1da177e4 LT |
862 | } |
863 | ||
746d4a02 | 864 | static int snd_info_dev_free_entry(struct snd_device *device) |
1da177e4 | 865 | { |
24c1f931 | 866 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 867 | snd_info_free_entry(entry); |
1da177e4 LT |
868 | return 0; |
869 | } | |
870 | ||
746d4a02 | 871 | static int snd_info_dev_register_entry(struct snd_device *device) |
1da177e4 | 872 | { |
24c1f931 | 873 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 874 | return snd_info_register(entry); |
1da177e4 LT |
875 | } |
876 | ||
877 | /** | |
878 | * snd_card_proc_new - create an info entry for the given card | |
879 | * @card: the card instance | |
880 | * @name: the file name | |
881 | * @entryp: the pointer to store the new info entry | |
882 | * | |
883 | * Creates a new info entry and assigns it to the given card. | |
884 | * Unlike snd_info_create_card_entry(), this function registers the | |
885 | * info entry as an ALSA device component, so that it can be | |
886 | * unregistered/released without explicit call. | |
887 | * Also, you don't have to register this entry via snd_info_register(), | |
888 | * since this will be registered by snd_card_register() automatically. | |
889 | * | |
890 | * The parent is assumed as card->proc_root. | |
891 | * | |
892 | * For releasing this entry, use snd_device_free() instead of | |
893 | * snd_info_free_entry(). | |
894 | * | |
895 | * Returns zero if successful, or a negative error code on failure. | |
896 | */ | |
24c1f931 TI |
897 | int snd_card_proc_new(struct snd_card *card, const char *name, |
898 | struct snd_info_entry **entryp) | |
1da177e4 | 899 | { |
24c1f931 | 900 | static struct snd_device_ops ops = { |
1da177e4 LT |
901 | .dev_free = snd_info_dev_free_entry, |
902 | .dev_register = snd_info_dev_register_entry, | |
746d4a02 | 903 | /* disconnect is done via snd_info_card_disconnect() */ |
1da177e4 | 904 | }; |
24c1f931 | 905 | struct snd_info_entry *entry; |
1da177e4 LT |
906 | int err; |
907 | ||
908 | entry = snd_info_create_card_entry(card, name, card->proc_root); | |
909 | if (! entry) | |
910 | return -ENOMEM; | |
911 | if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) { | |
912 | snd_info_free_entry(entry); | |
913 | return err; | |
914 | } | |
915 | if (entryp) | |
916 | *entryp = entry; | |
917 | return 0; | |
918 | } | |
919 | ||
c0d3fb39 TI |
920 | EXPORT_SYMBOL(snd_card_proc_new); |
921 | ||
1da177e4 LT |
922 | /** |
923 | * snd_info_free_entry - release the info entry | |
924 | * @entry: the info entry | |
925 | * | |
926 | * Releases the info entry. Don't call this after registered. | |
927 | */ | |
24c1f931 | 928 | void snd_info_free_entry(struct snd_info_entry * entry) |
1da177e4 LT |
929 | { |
930 | if (entry == NULL) | |
931 | return; | |
746d4a02 TI |
932 | if (entry->p) { |
933 | mutex_lock(&info_mutex); | |
934 | snd_info_disconnect(entry); | |
935 | mutex_unlock(&info_mutex); | |
936 | } | |
1da177e4 LT |
937 | kfree(entry->name); |
938 | if (entry->private_free) | |
939 | entry->private_free(entry); | |
940 | kfree(entry); | |
941 | } | |
942 | ||
c0d3fb39 TI |
943 | EXPORT_SYMBOL(snd_info_free_entry); |
944 | ||
1da177e4 LT |
945 | /** |
946 | * snd_info_register - register the info entry | |
947 | * @entry: the info entry | |
948 | * | |
949 | * Registers the proc info entry. | |
950 | * | |
951 | * Returns zero if successful, or a negative error code on failure. | |
952 | */ | |
24c1f931 | 953 | int snd_info_register(struct snd_info_entry * entry) |
1da177e4 LT |
954 | { |
955 | struct proc_dir_entry *root, *p = NULL; | |
956 | ||
7eaa943c TI |
957 | if (snd_BUG_ON(!entry)) |
958 | return -ENXIO; | |
1da177e4 | 959 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; |
1a60d4c5 | 960 | mutex_lock(&info_mutex); |
99b76233 | 961 | p = create_proc_entry(entry->name, entry->mode, root); |
1da177e4 | 962 | if (!p) { |
1a60d4c5 | 963 | mutex_unlock(&info_mutex); |
1da177e4 LT |
964 | return -ENOMEM; |
965 | } | |
1da177e4 LT |
966 | if (!S_ISDIR(entry->mode)) |
967 | p->proc_fops = &snd_info_entry_operations; | |
968 | p->size = entry->size; | |
969 | p->data = entry; | |
970 | entry->p = p; | |
746d4a02 TI |
971 | if (entry->parent) |
972 | list_add_tail(&entry->list, &entry->parent->children); | |
1a60d4c5 | 973 | mutex_unlock(&info_mutex); |
1da177e4 LT |
974 | return 0; |
975 | } | |
976 | ||
c0d3fb39 TI |
977 | EXPORT_SYMBOL(snd_info_register); |
978 | ||
1da177e4 LT |
979 | /* |
980 | ||
981 | */ | |
982 | ||
6581f4e7 | 983 | static struct snd_info_entry *snd_info_version_entry; |
1da177e4 | 984 | |
24c1f931 | 985 | static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) |
1da177e4 LT |
986 | { |
987 | snd_iprintf(buffer, | |
988 | "Advanced Linux Sound Architecture Driver Version " | |
989 | CONFIG_SND_VERSION CONFIG_SND_DATE ".\n" | |
990 | ); | |
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 */ |