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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> |
1da177e4 | 25 | #include <linux/smp_lock.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 LT |
165 | struct snd_info_entry *entry; |
166 | loff_t ret; | |
167 | ||
168 | data = file->private_data; | |
169 | entry = data->entry; | |
170 | lock_kernel(); | |
171 | switch (entry->content) { | |
172 | case SNDRV_INFO_CONTENT_TEXT: | |
173 | switch (orig) { | |
e6f8f108 | 174 | case SEEK_SET: |
1da177e4 LT |
175 | file->f_pos = offset; |
176 | ret = file->f_pos; | |
177 | goto out; | |
e6f8f108 | 178 | case SEEK_CUR: |
1da177e4 LT |
179 | file->f_pos += offset; |
180 | ret = file->f_pos; | |
181 | goto out; | |
e6f8f108 | 182 | case SEEK_END: |
1da177e4 LT |
183 | default: |
184 | ret = -EINVAL; | |
185 | goto out; | |
186 | } | |
187 | break; | |
188 | case SNDRV_INFO_CONTENT_DATA: | |
189 | if (entry->c.ops->llseek) { | |
190 | ret = entry->c.ops->llseek(entry, | |
191 | data->file_private_data, | |
192 | file, offset, orig); | |
193 | goto out; | |
194 | } | |
195 | break; | |
196 | } | |
197 | ret = -ENXIO; | |
198 | out: | |
199 | unlock_kernel(); | |
200 | return ret; | |
201 | } | |
202 | ||
203 | static ssize_t snd_info_entry_read(struct file *file, char __user *buffer, | |
204 | size_t count, loff_t * offset) | |
205 | { | |
24c1f931 | 206 | struct snd_info_private_data *data; |
1da177e4 | 207 | struct snd_info_entry *entry; |
24c1f931 | 208 | struct snd_info_buffer *buf; |
1da177e4 LT |
209 | size_t size = 0; |
210 | loff_t pos; | |
211 | ||
212 | data = file->private_data; | |
7eaa943c TI |
213 | if (snd_BUG_ON(!data)) |
214 | return -ENXIO; | |
1da177e4 LT |
215 | pos = *offset; |
216 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
217 | return -EIO; | |
218 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
219 | return -EIO; | |
220 | entry = data->entry; | |
221 | switch (entry->content) { | |
222 | case SNDRV_INFO_CONTENT_TEXT: | |
223 | buf = data->rbuffer; | |
224 | if (buf == NULL) | |
225 | return -EIO; | |
226 | if (pos >= buf->size) | |
227 | return 0; | |
228 | size = buf->size - pos; | |
229 | size = min(count, size); | |
230 | if (copy_to_user(buffer, buf->buffer + pos, size)) | |
231 | return -EFAULT; | |
232 | break; | |
233 | case SNDRV_INFO_CONTENT_DATA: | |
234 | if (entry->c.ops->read) | |
235 | size = entry->c.ops->read(entry, | |
236 | data->file_private_data, | |
237 | file, buffer, count, pos); | |
238 | break; | |
239 | } | |
240 | if ((ssize_t) size > 0) | |
241 | *offset = pos + size; | |
242 | return size; | |
243 | } | |
244 | ||
245 | static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer, | |
246 | size_t count, loff_t * offset) | |
247 | { | |
24c1f931 | 248 | struct snd_info_private_data *data; |
1da177e4 | 249 | struct snd_info_entry *entry; |
24c1f931 | 250 | struct snd_info_buffer *buf; |
7e4eeec8 | 251 | ssize_t size = 0; |
1da177e4 LT |
252 | loff_t pos; |
253 | ||
254 | data = file->private_data; | |
7eaa943c TI |
255 | if (snd_BUG_ON(!data)) |
256 | return -ENXIO; | |
1da177e4 LT |
257 | entry = data->entry; |
258 | pos = *offset; | |
259 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
260 | return -EIO; | |
261 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
262 | return -EIO; | |
263 | switch (entry->content) { | |
264 | case SNDRV_INFO_CONTENT_TEXT: | |
265 | buf = data->wbuffer; | |
266 | if (buf == NULL) | |
267 | return -EIO; | |
f4a747f1 | 268 | mutex_lock(&entry->access); |
7e4eeec8 TI |
269 | if (pos + count >= buf->len) { |
270 | if (resize_info_buffer(buf, pos + count)) { | |
271 | mutex_unlock(&entry->access); | |
272 | return -ENOMEM; | |
273 | } | |
274 | } | |
275 | if (copy_from_user(buf->buffer + pos, buffer, count)) { | |
276 | mutex_unlock(&entry->access); | |
1da177e4 | 277 | return -EFAULT; |
7e4eeec8 TI |
278 | } |
279 | buf->size = pos + count; | |
280 | mutex_unlock(&entry->access); | |
281 | size = count; | |
1da177e4 LT |
282 | break; |
283 | case SNDRV_INFO_CONTENT_DATA: | |
284 | if (entry->c.ops->write) | |
285 | size = entry->c.ops->write(entry, | |
286 | data->file_private_data, | |
287 | file, buffer, count, pos); | |
288 | break; | |
289 | } | |
290 | if ((ssize_t) size > 0) | |
291 | *offset = pos + size; | |
292 | return size; | |
293 | } | |
294 | ||
295 | static int snd_info_entry_open(struct inode *inode, struct file *file) | |
296 | { | |
24c1f931 TI |
297 | struct snd_info_entry *entry; |
298 | struct snd_info_private_data *data; | |
299 | struct snd_info_buffer *buffer; | |
1da177e4 LT |
300 | struct proc_dir_entry *p; |
301 | int mode, err; | |
302 | ||
1a60d4c5 | 303 | mutex_lock(&info_mutex); |
1da177e4 | 304 | p = PDE(inode); |
24c1f931 | 305 | entry = p == NULL ? NULL : (struct snd_info_entry *)p->data; |
746d4a02 | 306 | if (entry == NULL || ! entry->p) { |
1a60d4c5 | 307 | mutex_unlock(&info_mutex); |
1da177e4 LT |
308 | return -ENODEV; |
309 | } | |
310 | if (!try_module_get(entry->module)) { | |
311 | err = -EFAULT; | |
312 | goto __error1; | |
313 | } | |
314 | mode = file->f_flags & O_ACCMODE; | |
315 | if (mode == O_RDONLY || mode == O_RDWR) { | |
7e4eeec8 | 316 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
1da177e4 LT |
317 | entry->c.ops->read == NULL)) { |
318 | err = -ENODEV; | |
319 | goto __error; | |
320 | } | |
321 | } | |
322 | if (mode == O_WRONLY || mode == O_RDWR) { | |
7e4eeec8 | 323 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
1da177e4 LT |
324 | entry->c.ops->write == NULL)) { |
325 | err = -ENODEV; | |
326 | goto __error; | |
327 | } | |
328 | } | |
ca2c0966 | 329 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
330 | if (data == NULL) { |
331 | err = -ENOMEM; | |
332 | goto __error; | |
333 | } | |
334 | data->entry = entry; | |
335 | switch (entry->content) { | |
336 | case SNDRV_INFO_CONTENT_TEXT: | |
337 | if (mode == O_RDONLY || mode == O_RDWR) { | |
ca2c0966 | 338 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
7e4eeec8 TI |
339 | if (buffer == NULL) |
340 | goto __nomem; | |
1da177e4 | 341 | data->rbuffer = buffer; |
7e4eeec8 TI |
342 | buffer->len = PAGE_SIZE; |
343 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); | |
344 | if (buffer->buffer == NULL) | |
345 | goto __nomem; | |
1da177e4 LT |
346 | } |
347 | if (mode == O_WRONLY || mode == O_RDWR) { | |
ca2c0966 | 348 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
7e4eeec8 TI |
349 | if (buffer == NULL) |
350 | goto __nomem; | |
1da177e4 | 351 | data->wbuffer = buffer; |
7e4eeec8 TI |
352 | buffer->len = PAGE_SIZE; |
353 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); | |
354 | if (buffer->buffer == NULL) | |
355 | goto __nomem; | |
1da177e4 LT |
356 | } |
357 | break; | |
358 | case SNDRV_INFO_CONTENT_DATA: /* data */ | |
359 | if (entry->c.ops->open) { | |
360 | if ((err = entry->c.ops->open(entry, mode, | |
361 | &data->file_private_data)) < 0) { | |
362 | kfree(data); | |
363 | goto __error; | |
364 | } | |
365 | } | |
366 | break; | |
367 | } | |
368 | file->private_data = data; | |
1a60d4c5 | 369 | mutex_unlock(&info_mutex); |
1da177e4 LT |
370 | if (entry->content == SNDRV_INFO_CONTENT_TEXT && |
371 | (mode == O_RDONLY || mode == O_RDWR)) { | |
372 | if (entry->c.text.read) { | |
1a60d4c5 | 373 | mutex_lock(&entry->access); |
1da177e4 | 374 | entry->c.text.read(entry, data->rbuffer); |
1a60d4c5 | 375 | mutex_unlock(&entry->access); |
1da177e4 LT |
376 | } |
377 | } | |
378 | return 0; | |
379 | ||
7e4eeec8 TI |
380 | __nomem: |
381 | if (data->rbuffer) { | |
382 | kfree(data->rbuffer->buffer); | |
383 | kfree(data->rbuffer); | |
384 | } | |
385 | if (data->wbuffer) { | |
386 | kfree(data->wbuffer->buffer); | |
387 | kfree(data->wbuffer); | |
388 | } | |
389 | kfree(data); | |
390 | err = -ENOMEM; | |
1da177e4 LT |
391 | __error: |
392 | module_put(entry->module); | |
393 | __error1: | |
1a60d4c5 | 394 | mutex_unlock(&info_mutex); |
1da177e4 LT |
395 | return err; |
396 | } | |
397 | ||
398 | static int snd_info_entry_release(struct inode *inode, struct file *file) | |
399 | { | |
24c1f931 TI |
400 | struct snd_info_entry *entry; |
401 | struct snd_info_private_data *data; | |
1da177e4 LT |
402 | int mode; |
403 | ||
404 | mode = file->f_flags & O_ACCMODE; | |
405 | data = file->private_data; | |
406 | entry = data->entry; | |
407 | switch (entry->content) { | |
408 | case SNDRV_INFO_CONTENT_TEXT: | |
7e4eeec8 TI |
409 | if (data->rbuffer) { |
410 | kfree(data->rbuffer->buffer); | |
1da177e4 LT |
411 | kfree(data->rbuffer); |
412 | } | |
7e4eeec8 | 413 | if (data->wbuffer) { |
1da177e4 LT |
414 | if (entry->c.text.write) { |
415 | entry->c.text.write(entry, data->wbuffer); | |
416 | if (data->wbuffer->error) { | |
417 | snd_printk(KERN_WARNING "data write error to %s (%i)\n", | |
418 | entry->name, | |
419 | data->wbuffer->error); | |
420 | } | |
421 | } | |
7e4eeec8 | 422 | kfree(data->wbuffer->buffer); |
1da177e4 LT |
423 | kfree(data->wbuffer); |
424 | } | |
425 | break; | |
426 | case SNDRV_INFO_CONTENT_DATA: | |
427 | if (entry->c.ops->release) | |
428 | entry->c.ops->release(entry, mode, | |
429 | data->file_private_data); | |
430 | break; | |
431 | } | |
432 | module_put(entry->module); | |
433 | kfree(data); | |
434 | return 0; | |
435 | } | |
436 | ||
437 | static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait) | |
438 | { | |
24c1f931 | 439 | struct snd_info_private_data *data; |
1da177e4 LT |
440 | struct snd_info_entry *entry; |
441 | unsigned int mask; | |
442 | ||
443 | data = file->private_data; | |
444 | if (data == NULL) | |
445 | return 0; | |
446 | entry = data->entry; | |
447 | mask = 0; | |
448 | switch (entry->content) { | |
449 | case SNDRV_INFO_CONTENT_DATA: | |
450 | if (entry->c.ops->poll) | |
451 | return entry->c.ops->poll(entry, | |
452 | data->file_private_data, | |
453 | file, wait); | |
454 | if (entry->c.ops->read) | |
455 | mask |= POLLIN | POLLRDNORM; | |
456 | if (entry->c.ops->write) | |
457 | mask |= POLLOUT | POLLWRNORM; | |
458 | break; | |
459 | } | |
460 | return mask; | |
461 | } | |
462 | ||
d99e9889 IM |
463 | static long snd_info_entry_ioctl(struct file *file, unsigned int cmd, |
464 | unsigned long arg) | |
1da177e4 | 465 | { |
24c1f931 | 466 | struct snd_info_private_data *data; |
1da177e4 LT |
467 | struct snd_info_entry *entry; |
468 | ||
469 | data = file->private_data; | |
470 | if (data == NULL) | |
471 | return 0; | |
472 | entry = data->entry; | |
473 | switch (entry->content) { | |
474 | case SNDRV_INFO_CONTENT_DATA: | |
475 | if (entry->c.ops->ioctl) | |
476 | return entry->c.ops->ioctl(entry, | |
477 | data->file_private_data, | |
478 | file, cmd, arg); | |
479 | break; | |
480 | } | |
481 | return -ENOTTY; | |
482 | } | |
483 | ||
1da177e4 LT |
484 | static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma) |
485 | { | |
7bc56323 | 486 | struct inode *inode = file->f_path.dentry->d_inode; |
24c1f931 | 487 | struct snd_info_private_data *data; |
1da177e4 LT |
488 | struct snd_info_entry *entry; |
489 | ||
490 | data = file->private_data; | |
491 | if (data == NULL) | |
492 | return 0; | |
493 | entry = data->entry; | |
494 | switch (entry->content) { | |
495 | case SNDRV_INFO_CONTENT_DATA: | |
496 | if (entry->c.ops->mmap) | |
497 | return entry->c.ops->mmap(entry, | |
498 | data->file_private_data, | |
499 | inode, file, vma); | |
500 | break; | |
501 | } | |
502 | return -ENXIO; | |
503 | } | |
504 | ||
9c2e08c5 | 505 | static const struct file_operations snd_info_entry_operations = |
1da177e4 | 506 | { |
d99e9889 IM |
507 | .owner = THIS_MODULE, |
508 | .llseek = snd_info_entry_llseek, | |
509 | .read = snd_info_entry_read, | |
510 | .write = snd_info_entry_write, | |
511 | .poll = snd_info_entry_poll, | |
512 | .unlocked_ioctl = snd_info_entry_ioctl, | |
513 | .mmap = snd_info_entry_mmap, | |
514 | .open = snd_info_entry_open, | |
515 | .release = snd_info_entry_release, | |
1da177e4 LT |
516 | }; |
517 | ||
1da177e4 LT |
518 | int __init snd_info_init(void) |
519 | { | |
520 | struct proc_dir_entry *p; | |
521 | ||
99b76233 | 522 | p = create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, NULL); |
1da177e4 LT |
523 | if (p == NULL) |
524 | return -ENOMEM; | |
525 | snd_proc_root = p; | |
526 | #ifdef CONFIG_SND_OSSEMUL | |
527 | { | |
24c1f931 | 528 | struct snd_info_entry *entry; |
1da177e4 LT |
529 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL) |
530 | return -ENOMEM; | |
531 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
532 | if (snd_info_register(entry) < 0) { | |
533 | snd_info_free_entry(entry); | |
534 | return -ENOMEM; | |
535 | } | |
536 | snd_oss_root = entry; | |
537 | } | |
538 | #endif | |
539 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
540 | { | |
24c1f931 | 541 | struct snd_info_entry *entry; |
1da177e4 LT |
542 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", 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_seq_root = entry; | |
550 | } | |
551 | #endif | |
552 | snd_info_version_init(); | |
1da177e4 LT |
553 | snd_minor_info_init(); |
554 | snd_minor_info_oss_init(); | |
555 | snd_card_info_init(); | |
556 | return 0; | |
557 | } | |
558 | ||
559 | int __exit snd_info_done(void) | |
560 | { | |
561 | snd_card_info_done(); | |
562 | snd_minor_info_oss_done(); | |
563 | snd_minor_info_done(); | |
1da177e4 LT |
564 | snd_info_version_done(); |
565 | if (snd_proc_root) { | |
566 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
746d4a02 | 567 | snd_info_free_entry(snd_seq_root); |
1da177e4 LT |
568 | #endif |
569 | #ifdef CONFIG_SND_OSSEMUL | |
746d4a02 | 570 | snd_info_free_entry(snd_oss_root); |
1da177e4 | 571 | #endif |
c74c120a | 572 | snd_remove_proc_entry(NULL, snd_proc_root); |
1da177e4 LT |
573 | } |
574 | return 0; | |
575 | } | |
576 | ||
577 | /* | |
578 | ||
579 | */ | |
580 | ||
581 | ||
582 | /* | |
583 | * create a card proc file | |
584 | * called from init.c | |
585 | */ | |
24c1f931 | 586 | int snd_info_card_create(struct snd_card *card) |
1da177e4 LT |
587 | { |
588 | char str[8]; | |
24c1f931 | 589 | struct snd_info_entry *entry; |
1da177e4 | 590 | |
7eaa943c TI |
591 | if (snd_BUG_ON(!card)) |
592 | return -ENXIO; | |
1da177e4 LT |
593 | |
594 | sprintf(str, "card%i", card->number); | |
595 | if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL) | |
596 | return -ENOMEM; | |
597 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
598 | if (snd_info_register(entry) < 0) { | |
599 | snd_info_free_entry(entry); | |
600 | return -ENOMEM; | |
601 | } | |
602 | card->proc_root = entry; | |
603 | return 0; | |
604 | } | |
605 | ||
606 | /* | |
607 | * register the card proc file | |
608 | * called from init.c | |
609 | */ | |
24c1f931 | 610 | int snd_info_card_register(struct snd_card *card) |
1da177e4 LT |
611 | { |
612 | struct proc_dir_entry *p; | |
613 | ||
7eaa943c TI |
614 | if (snd_BUG_ON(!card)) |
615 | return -ENXIO; | |
1da177e4 LT |
616 | |
617 | if (!strcmp(card->id, card->proc_root->name)) | |
618 | return 0; | |
619 | ||
620 | p = proc_symlink(card->id, snd_proc_root, card->proc_root->name); | |
621 | if (p == NULL) | |
622 | return -ENOMEM; | |
623 | card->proc_root_link = p; | |
624 | return 0; | |
625 | } | |
626 | ||
c2eb9c4e JK |
627 | /* |
628 | * called on card->id change | |
629 | */ | |
630 | void snd_info_card_id_change(struct snd_card *card) | |
631 | { | |
632 | mutex_lock(&info_mutex); | |
633 | if (card->proc_root_link) { | |
634 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); | |
635 | card->proc_root_link = NULL; | |
636 | } | |
637 | if (strcmp(card->id, card->proc_root->name)) | |
638 | card->proc_root_link = proc_symlink(card->id, | |
639 | snd_proc_root, | |
640 | card->proc_root->name); | |
641 | mutex_unlock(&info_mutex); | |
642 | } | |
643 | ||
1da177e4 LT |
644 | /* |
645 | * de-register the card proc file | |
646 | * called from init.c | |
647 | */ | |
746d4a02 | 648 | void snd_info_card_disconnect(struct snd_card *card) |
1da177e4 | 649 | { |
7eaa943c TI |
650 | if (!card) |
651 | return; | |
746d4a02 | 652 | mutex_lock(&info_mutex); |
1da177e4 LT |
653 | if (card->proc_root_link) { |
654 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); | |
655 | card->proc_root_link = NULL; | |
656 | } | |
746d4a02 TI |
657 | if (card->proc_root) |
658 | snd_info_disconnect(card->proc_root); | |
659 | mutex_unlock(&info_mutex); | |
660 | } | |
661 | ||
662 | /* | |
663 | * release the card proc file resources | |
664 | * called from init.c | |
665 | */ | |
666 | int snd_info_card_free(struct snd_card *card) | |
667 | { | |
7eaa943c TI |
668 | if (!card) |
669 | return 0; | |
746d4a02 TI |
670 | snd_info_free_entry(card->proc_root); |
671 | card->proc_root = NULL; | |
1da177e4 LT |
672 | return 0; |
673 | } | |
674 | ||
675 | ||
676 | /** | |
677 | * snd_info_get_line - read one line from the procfs buffer | |
678 | * @buffer: the procfs buffer | |
679 | * @line: the buffer to store | |
680 | * @len: the max. buffer size - 1 | |
681 | * | |
682 | * Reads one line from the buffer and stores the string. | |
683 | * | |
684 | * Returns zero if successful, or 1 if error or EOF. | |
685 | */ | |
24c1f931 | 686 | int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) |
1da177e4 LT |
687 | { |
688 | int c = -1; | |
689 | ||
690 | if (len <= 0 || buffer->stop || buffer->error) | |
691 | return 1; | |
692 | while (--len > 0) { | |
7e4eeec8 | 693 | c = buffer->buffer[buffer->curr++]; |
1da177e4 | 694 | if (c == '\n') { |
7e4eeec8 | 695 | if (buffer->curr >= buffer->size) |
1da177e4 | 696 | buffer->stop = 1; |
1da177e4 LT |
697 | break; |
698 | } | |
699 | *line++ = c; | |
7e4eeec8 | 700 | if (buffer->curr >= buffer->size) { |
1da177e4 LT |
701 | buffer->stop = 1; |
702 | break; | |
703 | } | |
704 | } | |
705 | while (c != '\n' && !buffer->stop) { | |
7e4eeec8 TI |
706 | c = buffer->buffer[buffer->curr++]; |
707 | if (buffer->curr >= buffer->size) | |
1da177e4 | 708 | buffer->stop = 1; |
1da177e4 LT |
709 | } |
710 | *line = '\0'; | |
711 | return 0; | |
712 | } | |
713 | ||
c0d3fb39 TI |
714 | EXPORT_SYMBOL(snd_info_get_line); |
715 | ||
1da177e4 | 716 | /** |
856def8a | 717 | * snd_info_get_str - parse a string token |
1da177e4 LT |
718 | * @dest: the buffer to store the string token |
719 | * @src: the original string | |
720 | * @len: the max. length of token - 1 | |
721 | * | |
722 | * Parses the original string and copy a token to the given | |
723 | * string buffer. | |
724 | * | |
725 | * Returns the updated pointer of the original string so that | |
726 | * it can be used for the next call. | |
727 | */ | |
4f7454a9 | 728 | const char *snd_info_get_str(char *dest, const char *src, int len) |
1da177e4 LT |
729 | { |
730 | int c; | |
731 | ||
732 | while (*src == ' ' || *src == '\t') | |
733 | src++; | |
734 | if (*src == '"' || *src == '\'') { | |
735 | c = *src++; | |
736 | while (--len > 0 && *src && *src != c) { | |
737 | *dest++ = *src++; | |
738 | } | |
739 | if (*src == c) | |
740 | src++; | |
741 | } else { | |
742 | while (--len > 0 && *src && *src != ' ' && *src != '\t') { | |
743 | *dest++ = *src++; | |
744 | } | |
745 | } | |
746 | *dest = 0; | |
747 | while (*src == ' ' || *src == '\t') | |
748 | src++; | |
749 | return src; | |
750 | } | |
751 | ||
c0d3fb39 TI |
752 | EXPORT_SYMBOL(snd_info_get_str); |
753 | ||
1da177e4 LT |
754 | /** |
755 | * snd_info_create_entry - create an info entry | |
756 | * @name: the proc file name | |
757 | * | |
758 | * Creates an info entry with the given file name and initializes as | |
759 | * the default state. | |
760 | * | |
761 | * Usually called from other functions such as | |
762 | * snd_info_create_card_entry(). | |
763 | * | |
764 | * Returns the pointer of the new instance, or NULL on failure. | |
765 | */ | |
24c1f931 | 766 | static struct snd_info_entry *snd_info_create_entry(const char *name) |
1da177e4 | 767 | { |
24c1f931 | 768 | struct snd_info_entry *entry; |
ca2c0966 | 769 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
1da177e4 LT |
770 | if (entry == NULL) |
771 | return NULL; | |
543537bd | 772 | entry->name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
773 | if (entry->name == NULL) { |
774 | kfree(entry); | |
775 | return NULL; | |
776 | } | |
777 | entry->mode = S_IFREG | S_IRUGO; | |
778 | entry->content = SNDRV_INFO_CONTENT_TEXT; | |
1a60d4c5 | 779 | mutex_init(&entry->access); |
746d4a02 TI |
780 | INIT_LIST_HEAD(&entry->children); |
781 | INIT_LIST_HEAD(&entry->list); | |
1da177e4 LT |
782 | return entry; |
783 | } | |
784 | ||
785 | /** | |
786 | * snd_info_create_module_entry - create an info entry for the given module | |
787 | * @module: the module pointer | |
788 | * @name: the file name | |
789 | * @parent: the parent directory | |
790 | * | |
791 | * Creates a new info entry and assigns it to the given module. | |
792 | * | |
793 | * Returns the pointer of the new instance, or NULL on failure. | |
794 | */ | |
24c1f931 | 795 | struct snd_info_entry *snd_info_create_module_entry(struct module * module, |
1da177e4 | 796 | const char *name, |
24c1f931 | 797 | struct snd_info_entry *parent) |
1da177e4 | 798 | { |
24c1f931 | 799 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
800 | if (entry) { |
801 | entry->module = module; | |
802 | entry->parent = parent; | |
803 | } | |
804 | return entry; | |
805 | } | |
806 | ||
c0d3fb39 TI |
807 | EXPORT_SYMBOL(snd_info_create_module_entry); |
808 | ||
1da177e4 LT |
809 | /** |
810 | * snd_info_create_card_entry - create an info entry for the given card | |
811 | * @card: the card instance | |
812 | * @name: the file name | |
813 | * @parent: the parent directory | |
814 | * | |
815 | * Creates a new info entry and assigns it to the given card. | |
816 | * | |
817 | * Returns the pointer of the new instance, or NULL on failure. | |
818 | */ | |
24c1f931 | 819 | struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, |
1da177e4 | 820 | const char *name, |
24c1f931 | 821 | struct snd_info_entry * parent) |
1da177e4 | 822 | { |
24c1f931 | 823 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
824 | if (entry) { |
825 | entry->module = card->module; | |
826 | entry->card = card; | |
827 | entry->parent = parent; | |
828 | } | |
829 | return entry; | |
830 | } | |
831 | ||
c0d3fb39 TI |
832 | EXPORT_SYMBOL(snd_info_create_card_entry); |
833 | ||
746d4a02 | 834 | static void snd_info_disconnect(struct snd_info_entry *entry) |
1da177e4 | 835 | { |
746d4a02 TI |
836 | struct list_head *p, *n; |
837 | struct proc_dir_entry *root; | |
1da177e4 | 838 | |
746d4a02 TI |
839 | list_for_each_safe(p, n, &entry->children) { |
840 | snd_info_disconnect(list_entry(p, struct snd_info_entry, list)); | |
841 | } | |
842 | ||
843 | if (! entry->p) | |
844 | return; | |
845 | list_del_init(&entry->list); | |
846 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; | |
7eaa943c | 847 | snd_BUG_ON(!root); |
746d4a02 TI |
848 | snd_remove_proc_entry(root, entry->p); |
849 | entry->p = NULL; | |
1da177e4 LT |
850 | } |
851 | ||
746d4a02 | 852 | static int snd_info_dev_free_entry(struct snd_device *device) |
1da177e4 | 853 | { |
24c1f931 | 854 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 855 | snd_info_free_entry(entry); |
1da177e4 LT |
856 | return 0; |
857 | } | |
858 | ||
746d4a02 | 859 | static int snd_info_dev_register_entry(struct snd_device *device) |
1da177e4 | 860 | { |
24c1f931 | 861 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 862 | return snd_info_register(entry); |
1da177e4 LT |
863 | } |
864 | ||
865 | /** | |
866 | * snd_card_proc_new - create an info entry for the given card | |
867 | * @card: the card instance | |
868 | * @name: the file name | |
869 | * @entryp: the pointer to store the new info entry | |
870 | * | |
871 | * Creates a new info entry and assigns it to the given card. | |
872 | * Unlike snd_info_create_card_entry(), this function registers the | |
873 | * info entry as an ALSA device component, so that it can be | |
874 | * unregistered/released without explicit call. | |
875 | * Also, you don't have to register this entry via snd_info_register(), | |
876 | * since this will be registered by snd_card_register() automatically. | |
877 | * | |
878 | * The parent is assumed as card->proc_root. | |
879 | * | |
880 | * For releasing this entry, use snd_device_free() instead of | |
881 | * snd_info_free_entry(). | |
882 | * | |
883 | * Returns zero if successful, or a negative error code on failure. | |
884 | */ | |
24c1f931 TI |
885 | int snd_card_proc_new(struct snd_card *card, const char *name, |
886 | struct snd_info_entry **entryp) | |
1da177e4 | 887 | { |
24c1f931 | 888 | static struct snd_device_ops ops = { |
1da177e4 LT |
889 | .dev_free = snd_info_dev_free_entry, |
890 | .dev_register = snd_info_dev_register_entry, | |
746d4a02 | 891 | /* disconnect is done via snd_info_card_disconnect() */ |
1da177e4 | 892 | }; |
24c1f931 | 893 | struct snd_info_entry *entry; |
1da177e4 LT |
894 | int err; |
895 | ||
896 | entry = snd_info_create_card_entry(card, name, card->proc_root); | |
897 | if (! entry) | |
898 | return -ENOMEM; | |
899 | if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) { | |
900 | snd_info_free_entry(entry); | |
901 | return err; | |
902 | } | |
903 | if (entryp) | |
904 | *entryp = entry; | |
905 | return 0; | |
906 | } | |
907 | ||
c0d3fb39 TI |
908 | EXPORT_SYMBOL(snd_card_proc_new); |
909 | ||
1da177e4 LT |
910 | /** |
911 | * snd_info_free_entry - release the info entry | |
912 | * @entry: the info entry | |
913 | * | |
914 | * Releases the info entry. Don't call this after registered. | |
915 | */ | |
24c1f931 | 916 | void snd_info_free_entry(struct snd_info_entry * entry) |
1da177e4 LT |
917 | { |
918 | if (entry == NULL) | |
919 | return; | |
746d4a02 TI |
920 | if (entry->p) { |
921 | mutex_lock(&info_mutex); | |
922 | snd_info_disconnect(entry); | |
923 | mutex_unlock(&info_mutex); | |
924 | } | |
1da177e4 LT |
925 | kfree(entry->name); |
926 | if (entry->private_free) | |
927 | entry->private_free(entry); | |
928 | kfree(entry); | |
929 | } | |
930 | ||
c0d3fb39 TI |
931 | EXPORT_SYMBOL(snd_info_free_entry); |
932 | ||
1da177e4 LT |
933 | /** |
934 | * snd_info_register - register the info entry | |
935 | * @entry: the info entry | |
936 | * | |
937 | * Registers the proc info entry. | |
938 | * | |
939 | * Returns zero if successful, or a negative error code on failure. | |
940 | */ | |
24c1f931 | 941 | int snd_info_register(struct snd_info_entry * entry) |
1da177e4 LT |
942 | { |
943 | struct proc_dir_entry *root, *p = NULL; | |
944 | ||
7eaa943c TI |
945 | if (snd_BUG_ON(!entry)) |
946 | return -ENXIO; | |
1da177e4 | 947 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; |
1a60d4c5 | 948 | mutex_lock(&info_mutex); |
99b76233 | 949 | p = create_proc_entry(entry->name, entry->mode, root); |
1da177e4 | 950 | if (!p) { |
1a60d4c5 | 951 | mutex_unlock(&info_mutex); |
1da177e4 LT |
952 | return -ENOMEM; |
953 | } | |
1da177e4 LT |
954 | if (!S_ISDIR(entry->mode)) |
955 | p->proc_fops = &snd_info_entry_operations; | |
956 | p->size = entry->size; | |
957 | p->data = entry; | |
958 | entry->p = p; | |
746d4a02 TI |
959 | if (entry->parent) |
960 | list_add_tail(&entry->list, &entry->parent->children); | |
1a60d4c5 | 961 | mutex_unlock(&info_mutex); |
1da177e4 LT |
962 | return 0; |
963 | } | |
964 | ||
c0d3fb39 TI |
965 | EXPORT_SYMBOL(snd_info_register); |
966 | ||
1da177e4 LT |
967 | /* |
968 | ||
969 | */ | |
970 | ||
6581f4e7 | 971 | static struct snd_info_entry *snd_info_version_entry; |
1da177e4 | 972 | |
24c1f931 | 973 | static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) |
1da177e4 LT |
974 | { |
975 | snd_iprintf(buffer, | |
976 | "Advanced Linux Sound Architecture Driver Version " | |
977 | CONFIG_SND_VERSION CONFIG_SND_DATE ".\n" | |
978 | ); | |
979 | } | |
980 | ||
981 | static int __init snd_info_version_init(void) | |
982 | { | |
24c1f931 | 983 | struct snd_info_entry *entry; |
1da177e4 LT |
984 | |
985 | entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL); | |
986 | if (entry == NULL) | |
987 | return -ENOMEM; | |
1da177e4 LT |
988 | entry->c.text.read = snd_info_version_read; |
989 | if (snd_info_register(entry) < 0) { | |
990 | snd_info_free_entry(entry); | |
991 | return -ENOMEM; | |
992 | } | |
993 | snd_info_version_entry = entry; | |
994 | return 0; | |
995 | } | |
996 | ||
997 | static int __exit snd_info_version_done(void) | |
998 | { | |
746d4a02 | 999 | snd_info_free_entry(snd_info_version_entry); |
1da177e4 LT |
1000 | return 0; |
1001 | } | |
1002 | ||
1003 | #endif /* CONFIG_PROC_FS */ |