Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Information interface for ALSA driver | |
3 | * Copyright (c) by Jaroslav Kysela <perex@suse.cz> | |
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 | ||
22 | #include <sound/driver.h> | |
23 | #include <linux/init.h> | |
1da177e4 LT |
24 | #include <linux/time.h> |
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); | |
91 | nbuf = kmalloc(nsize, GFP_KERNEL); | |
92 | if (! nbuf) | |
93 | return -ENOMEM; | |
94 | ||
95 | memcpy(nbuf, buffer->buffer, buffer->len); | |
96 | kfree(buffer->buffer); | |
97 | buffer->buffer = nbuf; | |
98 | buffer->len = nsize; | |
99 | return 0; | |
100 | } | |
101 | ||
1da177e4 LT |
102 | /** |
103 | * snd_iprintf - printf on the procfs buffer | |
104 | * @buffer: the procfs buffer | |
105 | * @fmt: the printf format | |
106 | * | |
107 | * Outputs the string on the procfs buffer just like printf(). | |
108 | * | |
109 | * Returns the size of output string. | |
110 | */ | |
24c1f931 | 111 | int snd_iprintf(struct snd_info_buffer *buffer, char *fmt,...) |
1da177e4 LT |
112 | { |
113 | va_list args; | |
114 | int len, res; | |
7e4eeec8 | 115 | int err = 0; |
1da177e4 | 116 | |
f001c3ac | 117 | might_sleep(); |
1da177e4 LT |
118 | if (buffer->stop || buffer->error) |
119 | return 0; | |
120 | len = buffer->len - buffer->size; | |
121 | va_start(args, fmt); | |
7e4eeec8 | 122 | for (;;) { |
dbedca39 TI |
123 | va_list ap; |
124 | va_copy(ap, args); | |
125 | res = vsnprintf(buffer->buffer + buffer->curr, len, fmt, ap); | |
126 | va_end(ap); | |
7e4eeec8 TI |
127 | if (res < len) |
128 | break; | |
129 | err = resize_info_buffer(buffer, buffer->len + PAGE_SIZE); | |
130 | if (err < 0) | |
131 | break; | |
132 | len = buffer->len - buffer->size; | |
1da177e4 | 133 | } |
7e4eeec8 TI |
134 | va_end(args); |
135 | ||
136 | if (err < 0) | |
137 | return err; | |
1da177e4 LT |
138 | buffer->curr += res; |
139 | buffer->size += res; | |
140 | return res; | |
141 | } | |
142 | ||
c0d3fb39 TI |
143 | EXPORT_SYMBOL(snd_iprintf); |
144 | ||
1da177e4 LT |
145 | /* |
146 | ||
147 | */ | |
148 | ||
6581f4e7 TI |
149 | static struct proc_dir_entry *snd_proc_root; |
150 | struct snd_info_entry *snd_seq_root; | |
c0d3fb39 TI |
151 | EXPORT_SYMBOL(snd_seq_root); |
152 | ||
1da177e4 | 153 | #ifdef CONFIG_SND_OSSEMUL |
6581f4e7 | 154 | struct snd_info_entry *snd_oss_root; |
1da177e4 LT |
155 | #endif |
156 | ||
157 | static inline void snd_info_entry_prepare(struct proc_dir_entry *de) | |
158 | { | |
159 | de->owner = THIS_MODULE; | |
160 | } | |
161 | ||
162 | static void snd_remove_proc_entry(struct proc_dir_entry *parent, | |
163 | struct proc_dir_entry *de) | |
164 | { | |
165 | if (de) | |
166 | remove_proc_entry(de->name, parent); | |
167 | } | |
168 | ||
169 | static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig) | |
170 | { | |
24c1f931 | 171 | struct snd_info_private_data *data; |
1da177e4 LT |
172 | struct snd_info_entry *entry; |
173 | loff_t ret; | |
174 | ||
175 | data = file->private_data; | |
176 | entry = data->entry; | |
177 | lock_kernel(); | |
178 | switch (entry->content) { | |
179 | case SNDRV_INFO_CONTENT_TEXT: | |
180 | switch (orig) { | |
e6f8f108 | 181 | case SEEK_SET: |
1da177e4 LT |
182 | file->f_pos = offset; |
183 | ret = file->f_pos; | |
184 | goto out; | |
e6f8f108 | 185 | case SEEK_CUR: |
1da177e4 LT |
186 | file->f_pos += offset; |
187 | ret = file->f_pos; | |
188 | goto out; | |
e6f8f108 | 189 | case SEEK_END: |
1da177e4 LT |
190 | default: |
191 | ret = -EINVAL; | |
192 | goto out; | |
193 | } | |
194 | break; | |
195 | case SNDRV_INFO_CONTENT_DATA: | |
196 | if (entry->c.ops->llseek) { | |
197 | ret = entry->c.ops->llseek(entry, | |
198 | data->file_private_data, | |
199 | file, offset, orig); | |
200 | goto out; | |
201 | } | |
202 | break; | |
203 | } | |
204 | ret = -ENXIO; | |
205 | out: | |
206 | unlock_kernel(); | |
207 | return ret; | |
208 | } | |
209 | ||
210 | static ssize_t snd_info_entry_read(struct file *file, char __user *buffer, | |
211 | size_t count, loff_t * offset) | |
212 | { | |
24c1f931 | 213 | struct snd_info_private_data *data; |
1da177e4 | 214 | struct snd_info_entry *entry; |
24c1f931 | 215 | struct snd_info_buffer *buf; |
1da177e4 LT |
216 | size_t size = 0; |
217 | loff_t pos; | |
218 | ||
219 | data = file->private_data; | |
220 | snd_assert(data != NULL, return -ENXIO); | |
221 | pos = *offset; | |
222 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
223 | return -EIO; | |
224 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
225 | return -EIO; | |
226 | entry = data->entry; | |
227 | switch (entry->content) { | |
228 | case SNDRV_INFO_CONTENT_TEXT: | |
229 | buf = data->rbuffer; | |
230 | if (buf == NULL) | |
231 | return -EIO; | |
232 | if (pos >= buf->size) | |
233 | return 0; | |
234 | size = buf->size - pos; | |
235 | size = min(count, size); | |
236 | if (copy_to_user(buffer, buf->buffer + pos, size)) | |
237 | return -EFAULT; | |
238 | break; | |
239 | case SNDRV_INFO_CONTENT_DATA: | |
240 | if (entry->c.ops->read) | |
241 | size = entry->c.ops->read(entry, | |
242 | data->file_private_data, | |
243 | file, buffer, count, pos); | |
244 | break; | |
245 | } | |
246 | if ((ssize_t) size > 0) | |
247 | *offset = pos + size; | |
248 | return size; | |
249 | } | |
250 | ||
251 | static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer, | |
252 | size_t count, loff_t * offset) | |
253 | { | |
24c1f931 | 254 | struct snd_info_private_data *data; |
1da177e4 | 255 | struct snd_info_entry *entry; |
24c1f931 | 256 | struct snd_info_buffer *buf; |
7e4eeec8 | 257 | ssize_t size = 0; |
1da177e4 LT |
258 | loff_t pos; |
259 | ||
260 | data = file->private_data; | |
261 | snd_assert(data != NULL, return -ENXIO); | |
262 | entry = data->entry; | |
263 | pos = *offset; | |
264 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
265 | return -EIO; | |
266 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
267 | return -EIO; | |
268 | switch (entry->content) { | |
269 | case SNDRV_INFO_CONTENT_TEXT: | |
270 | buf = data->wbuffer; | |
271 | if (buf == NULL) | |
272 | return -EIO; | |
f4a747f1 | 273 | mutex_lock(&entry->access); |
7e4eeec8 TI |
274 | if (pos + count >= buf->len) { |
275 | if (resize_info_buffer(buf, pos + count)) { | |
276 | mutex_unlock(&entry->access); | |
277 | return -ENOMEM; | |
278 | } | |
279 | } | |
280 | if (copy_from_user(buf->buffer + pos, buffer, count)) { | |
281 | mutex_unlock(&entry->access); | |
1da177e4 | 282 | return -EFAULT; |
7e4eeec8 TI |
283 | } |
284 | buf->size = pos + count; | |
285 | mutex_unlock(&entry->access); | |
286 | size = count; | |
1da177e4 LT |
287 | break; |
288 | case SNDRV_INFO_CONTENT_DATA: | |
289 | if (entry->c.ops->write) | |
290 | size = entry->c.ops->write(entry, | |
291 | data->file_private_data, | |
292 | file, buffer, count, pos); | |
293 | break; | |
294 | } | |
295 | if ((ssize_t) size > 0) | |
296 | *offset = pos + size; | |
297 | return size; | |
298 | } | |
299 | ||
300 | static int snd_info_entry_open(struct inode *inode, struct file *file) | |
301 | { | |
24c1f931 TI |
302 | struct snd_info_entry *entry; |
303 | struct snd_info_private_data *data; | |
304 | struct snd_info_buffer *buffer; | |
1da177e4 LT |
305 | struct proc_dir_entry *p; |
306 | int mode, err; | |
307 | ||
1a60d4c5 | 308 | mutex_lock(&info_mutex); |
1da177e4 | 309 | p = PDE(inode); |
24c1f931 | 310 | entry = p == NULL ? NULL : (struct snd_info_entry *)p->data; |
746d4a02 | 311 | if (entry == NULL || ! entry->p) { |
1a60d4c5 | 312 | mutex_unlock(&info_mutex); |
1da177e4 LT |
313 | return -ENODEV; |
314 | } | |
315 | if (!try_module_get(entry->module)) { | |
316 | err = -EFAULT; | |
317 | goto __error1; | |
318 | } | |
319 | mode = file->f_flags & O_ACCMODE; | |
320 | if (mode == O_RDONLY || mode == O_RDWR) { | |
7e4eeec8 | 321 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
1da177e4 LT |
322 | entry->c.ops->read == NULL)) { |
323 | err = -ENODEV; | |
324 | goto __error; | |
325 | } | |
326 | } | |
327 | if (mode == O_WRONLY || mode == O_RDWR) { | |
7e4eeec8 | 328 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
1da177e4 LT |
329 | entry->c.ops->write == NULL)) { |
330 | err = -ENODEV; | |
331 | goto __error; | |
332 | } | |
333 | } | |
ca2c0966 | 334 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
335 | if (data == NULL) { |
336 | err = -ENOMEM; | |
337 | goto __error; | |
338 | } | |
339 | data->entry = entry; | |
340 | switch (entry->content) { | |
341 | case SNDRV_INFO_CONTENT_TEXT: | |
342 | if (mode == O_RDONLY || mode == O_RDWR) { | |
ca2c0966 | 343 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
7e4eeec8 TI |
344 | if (buffer == NULL) |
345 | goto __nomem; | |
1da177e4 | 346 | data->rbuffer = buffer; |
7e4eeec8 TI |
347 | buffer->len = PAGE_SIZE; |
348 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); | |
349 | if (buffer->buffer == NULL) | |
350 | goto __nomem; | |
1da177e4 LT |
351 | } |
352 | if (mode == O_WRONLY || mode == O_RDWR) { | |
ca2c0966 | 353 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
7e4eeec8 TI |
354 | if (buffer == NULL) |
355 | goto __nomem; | |
1da177e4 | 356 | data->wbuffer = buffer; |
7e4eeec8 TI |
357 | buffer->len = PAGE_SIZE; |
358 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); | |
359 | if (buffer->buffer == NULL) | |
360 | goto __nomem; | |
1da177e4 LT |
361 | } |
362 | break; | |
363 | case SNDRV_INFO_CONTENT_DATA: /* data */ | |
364 | if (entry->c.ops->open) { | |
365 | if ((err = entry->c.ops->open(entry, mode, | |
366 | &data->file_private_data)) < 0) { | |
367 | kfree(data); | |
368 | goto __error; | |
369 | } | |
370 | } | |
371 | break; | |
372 | } | |
373 | file->private_data = data; | |
1a60d4c5 | 374 | mutex_unlock(&info_mutex); |
1da177e4 LT |
375 | if (entry->content == SNDRV_INFO_CONTENT_TEXT && |
376 | (mode == O_RDONLY || mode == O_RDWR)) { | |
377 | if (entry->c.text.read) { | |
1a60d4c5 | 378 | mutex_lock(&entry->access); |
1da177e4 | 379 | entry->c.text.read(entry, data->rbuffer); |
1a60d4c5 | 380 | mutex_unlock(&entry->access); |
1da177e4 LT |
381 | } |
382 | } | |
383 | return 0; | |
384 | ||
7e4eeec8 TI |
385 | __nomem: |
386 | if (data->rbuffer) { | |
387 | kfree(data->rbuffer->buffer); | |
388 | kfree(data->rbuffer); | |
389 | } | |
390 | if (data->wbuffer) { | |
391 | kfree(data->wbuffer->buffer); | |
392 | kfree(data->wbuffer); | |
393 | } | |
394 | kfree(data); | |
395 | err = -ENOMEM; | |
1da177e4 LT |
396 | __error: |
397 | module_put(entry->module); | |
398 | __error1: | |
1a60d4c5 | 399 | mutex_unlock(&info_mutex); |
1da177e4 LT |
400 | return err; |
401 | } | |
402 | ||
403 | static int snd_info_entry_release(struct inode *inode, struct file *file) | |
404 | { | |
24c1f931 TI |
405 | struct snd_info_entry *entry; |
406 | struct snd_info_private_data *data; | |
1da177e4 LT |
407 | int mode; |
408 | ||
409 | mode = file->f_flags & O_ACCMODE; | |
410 | data = file->private_data; | |
411 | entry = data->entry; | |
412 | switch (entry->content) { | |
413 | case SNDRV_INFO_CONTENT_TEXT: | |
7e4eeec8 TI |
414 | if (data->rbuffer) { |
415 | kfree(data->rbuffer->buffer); | |
1da177e4 LT |
416 | kfree(data->rbuffer); |
417 | } | |
7e4eeec8 | 418 | if (data->wbuffer) { |
1da177e4 LT |
419 | if (entry->c.text.write) { |
420 | entry->c.text.write(entry, data->wbuffer); | |
421 | if (data->wbuffer->error) { | |
422 | snd_printk(KERN_WARNING "data write error to %s (%i)\n", | |
423 | entry->name, | |
424 | data->wbuffer->error); | |
425 | } | |
426 | } | |
7e4eeec8 | 427 | kfree(data->wbuffer->buffer); |
1da177e4 LT |
428 | kfree(data->wbuffer); |
429 | } | |
430 | break; | |
431 | case SNDRV_INFO_CONTENT_DATA: | |
432 | if (entry->c.ops->release) | |
433 | entry->c.ops->release(entry, mode, | |
434 | data->file_private_data); | |
435 | break; | |
436 | } | |
437 | module_put(entry->module); | |
438 | kfree(data); | |
439 | return 0; | |
440 | } | |
441 | ||
442 | static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait) | |
443 | { | |
24c1f931 | 444 | struct snd_info_private_data *data; |
1da177e4 LT |
445 | struct snd_info_entry *entry; |
446 | unsigned int mask; | |
447 | ||
448 | data = file->private_data; | |
449 | if (data == NULL) | |
450 | return 0; | |
451 | entry = data->entry; | |
452 | mask = 0; | |
453 | switch (entry->content) { | |
454 | case SNDRV_INFO_CONTENT_DATA: | |
455 | if (entry->c.ops->poll) | |
456 | return entry->c.ops->poll(entry, | |
457 | data->file_private_data, | |
458 | file, wait); | |
459 | if (entry->c.ops->read) | |
460 | mask |= POLLIN | POLLRDNORM; | |
461 | if (entry->c.ops->write) | |
462 | mask |= POLLOUT | POLLWRNORM; | |
463 | break; | |
464 | } | |
465 | return mask; | |
466 | } | |
467 | ||
d99e9889 IM |
468 | static long snd_info_entry_ioctl(struct file *file, unsigned int cmd, |
469 | unsigned long arg) | |
1da177e4 | 470 | { |
24c1f931 | 471 | struct snd_info_private_data *data; |
1da177e4 LT |
472 | struct snd_info_entry *entry; |
473 | ||
474 | data = file->private_data; | |
475 | if (data == NULL) | |
476 | return 0; | |
477 | entry = data->entry; | |
478 | switch (entry->content) { | |
479 | case SNDRV_INFO_CONTENT_DATA: | |
480 | if (entry->c.ops->ioctl) | |
481 | return entry->c.ops->ioctl(entry, | |
482 | data->file_private_data, | |
483 | file, cmd, arg); | |
484 | break; | |
485 | } | |
486 | return -ENOTTY; | |
487 | } | |
488 | ||
1da177e4 LT |
489 | static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma) |
490 | { | |
491 | struct inode *inode = file->f_dentry->d_inode; | |
24c1f931 | 492 | struct snd_info_private_data *data; |
1da177e4 LT |
493 | struct snd_info_entry *entry; |
494 | ||
495 | data = file->private_data; | |
496 | if (data == NULL) | |
497 | return 0; | |
498 | entry = data->entry; | |
499 | switch (entry->content) { | |
500 | case SNDRV_INFO_CONTENT_DATA: | |
501 | if (entry->c.ops->mmap) | |
502 | return entry->c.ops->mmap(entry, | |
503 | data->file_private_data, | |
504 | inode, file, vma); | |
505 | break; | |
506 | } | |
507 | return -ENXIO; | |
508 | } | |
509 | ||
510 | static struct file_operations snd_info_entry_operations = | |
511 | { | |
d99e9889 IM |
512 | .owner = THIS_MODULE, |
513 | .llseek = snd_info_entry_llseek, | |
514 | .read = snd_info_entry_read, | |
515 | .write = snd_info_entry_write, | |
516 | .poll = snd_info_entry_poll, | |
517 | .unlocked_ioctl = snd_info_entry_ioctl, | |
518 | .mmap = snd_info_entry_mmap, | |
519 | .open = snd_info_entry_open, | |
520 | .release = snd_info_entry_release, | |
1da177e4 LT |
521 | }; |
522 | ||
523 | /** | |
524 | * snd_create_proc_entry - create a procfs entry | |
525 | * @name: the name of the proc file | |
526 | * @mode: the file permission bits, S_Ixxx | |
527 | * @parent: the parent proc-directory entry | |
528 | * | |
529 | * Creates a new proc file entry with the given name and permission | |
530 | * on the given directory. | |
531 | * | |
532 | * Returns the pointer of new instance or NULL on failure. | |
533 | */ | |
534 | static struct proc_dir_entry *snd_create_proc_entry(const char *name, mode_t mode, | |
535 | struct proc_dir_entry *parent) | |
536 | { | |
537 | struct proc_dir_entry *p; | |
538 | p = create_proc_entry(name, mode, parent); | |
539 | if (p) | |
540 | snd_info_entry_prepare(p); | |
541 | return p; | |
542 | } | |
543 | ||
544 | int __init snd_info_init(void) | |
545 | { | |
546 | struct proc_dir_entry *p; | |
547 | ||
548 | p = snd_create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, &proc_root); | |
549 | if (p == NULL) | |
550 | return -ENOMEM; | |
551 | snd_proc_root = p; | |
552 | #ifdef CONFIG_SND_OSSEMUL | |
553 | { | |
24c1f931 | 554 | struct snd_info_entry *entry; |
1da177e4 LT |
555 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL) |
556 | return -ENOMEM; | |
557 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
558 | if (snd_info_register(entry) < 0) { | |
559 | snd_info_free_entry(entry); | |
560 | return -ENOMEM; | |
561 | } | |
562 | snd_oss_root = entry; | |
563 | } | |
564 | #endif | |
565 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
566 | { | |
24c1f931 | 567 | struct snd_info_entry *entry; |
1da177e4 LT |
568 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL) |
569 | return -ENOMEM; | |
570 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
571 | if (snd_info_register(entry) < 0) { | |
572 | snd_info_free_entry(entry); | |
573 | return -ENOMEM; | |
574 | } | |
575 | snd_seq_root = entry; | |
576 | } | |
577 | #endif | |
578 | snd_info_version_init(); | |
1da177e4 LT |
579 | snd_minor_info_init(); |
580 | snd_minor_info_oss_init(); | |
581 | snd_card_info_init(); | |
582 | return 0; | |
583 | } | |
584 | ||
585 | int __exit snd_info_done(void) | |
586 | { | |
587 | snd_card_info_done(); | |
588 | snd_minor_info_oss_done(); | |
589 | snd_minor_info_done(); | |
1da177e4 LT |
590 | snd_info_version_done(); |
591 | if (snd_proc_root) { | |
592 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
746d4a02 | 593 | snd_info_free_entry(snd_seq_root); |
1da177e4 LT |
594 | #endif |
595 | #ifdef CONFIG_SND_OSSEMUL | |
746d4a02 | 596 | snd_info_free_entry(snd_oss_root); |
1da177e4 LT |
597 | #endif |
598 | snd_remove_proc_entry(&proc_root, snd_proc_root); | |
599 | } | |
600 | return 0; | |
601 | } | |
602 | ||
603 | /* | |
604 | ||
605 | */ | |
606 | ||
607 | ||
608 | /* | |
609 | * create a card proc file | |
610 | * called from init.c | |
611 | */ | |
24c1f931 | 612 | int snd_info_card_create(struct snd_card *card) |
1da177e4 LT |
613 | { |
614 | char str[8]; | |
24c1f931 | 615 | struct snd_info_entry *entry; |
1da177e4 LT |
616 | |
617 | snd_assert(card != NULL, return -ENXIO); | |
618 | ||
619 | sprintf(str, "card%i", card->number); | |
620 | if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL) | |
621 | return -ENOMEM; | |
622 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
623 | if (snd_info_register(entry) < 0) { | |
624 | snd_info_free_entry(entry); | |
625 | return -ENOMEM; | |
626 | } | |
627 | card->proc_root = entry; | |
628 | return 0; | |
629 | } | |
630 | ||
631 | /* | |
632 | * register the card proc file | |
633 | * called from init.c | |
634 | */ | |
24c1f931 | 635 | int snd_info_card_register(struct snd_card *card) |
1da177e4 LT |
636 | { |
637 | struct proc_dir_entry *p; | |
638 | ||
639 | snd_assert(card != NULL, return -ENXIO); | |
640 | ||
641 | if (!strcmp(card->id, card->proc_root->name)) | |
642 | return 0; | |
643 | ||
644 | p = proc_symlink(card->id, snd_proc_root, card->proc_root->name); | |
645 | if (p == NULL) | |
646 | return -ENOMEM; | |
647 | card->proc_root_link = p; | |
648 | return 0; | |
649 | } | |
650 | ||
651 | /* | |
652 | * de-register the card proc file | |
653 | * called from init.c | |
654 | */ | |
746d4a02 | 655 | void snd_info_card_disconnect(struct snd_card *card) |
1da177e4 | 656 | { |
746d4a02 TI |
657 | snd_assert(card != NULL, return); |
658 | mutex_lock(&info_mutex); | |
1da177e4 LT |
659 | if (card->proc_root_link) { |
660 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); | |
661 | card->proc_root_link = NULL; | |
662 | } | |
746d4a02 TI |
663 | if (card->proc_root) |
664 | snd_info_disconnect(card->proc_root); | |
665 | mutex_unlock(&info_mutex); | |
666 | } | |
667 | ||
668 | /* | |
669 | * release the card proc file resources | |
670 | * called from init.c | |
671 | */ | |
672 | int snd_info_card_free(struct snd_card *card) | |
673 | { | |
674 | snd_assert(card != NULL, return -ENXIO); | |
675 | snd_info_free_entry(card->proc_root); | |
676 | card->proc_root = NULL; | |
1da177e4 LT |
677 | return 0; |
678 | } | |
679 | ||
680 | ||
681 | /** | |
682 | * snd_info_get_line - read one line from the procfs buffer | |
683 | * @buffer: the procfs buffer | |
684 | * @line: the buffer to store | |
685 | * @len: the max. buffer size - 1 | |
686 | * | |
687 | * Reads one line from the buffer and stores the string. | |
688 | * | |
689 | * Returns zero if successful, or 1 if error or EOF. | |
690 | */ | |
24c1f931 | 691 | int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) |
1da177e4 LT |
692 | { |
693 | int c = -1; | |
694 | ||
695 | if (len <= 0 || buffer->stop || buffer->error) | |
696 | return 1; | |
697 | while (--len > 0) { | |
7e4eeec8 | 698 | c = buffer->buffer[buffer->curr++]; |
1da177e4 | 699 | if (c == '\n') { |
7e4eeec8 | 700 | if (buffer->curr >= buffer->size) |
1da177e4 | 701 | buffer->stop = 1; |
1da177e4 LT |
702 | break; |
703 | } | |
704 | *line++ = c; | |
7e4eeec8 | 705 | if (buffer->curr >= buffer->size) { |
1da177e4 LT |
706 | buffer->stop = 1; |
707 | break; | |
708 | } | |
709 | } | |
710 | while (c != '\n' && !buffer->stop) { | |
7e4eeec8 TI |
711 | c = buffer->buffer[buffer->curr++]; |
712 | if (buffer->curr >= buffer->size) | |
1da177e4 | 713 | buffer->stop = 1; |
1da177e4 LT |
714 | } |
715 | *line = '\0'; | |
716 | return 0; | |
717 | } | |
718 | ||
c0d3fb39 TI |
719 | EXPORT_SYMBOL(snd_info_get_line); |
720 | ||
1da177e4 | 721 | /** |
856def8a | 722 | * snd_info_get_str - parse a string token |
1da177e4 LT |
723 | * @dest: the buffer to store the string token |
724 | * @src: the original string | |
725 | * @len: the max. length of token - 1 | |
726 | * | |
727 | * Parses the original string and copy a token to the given | |
728 | * string buffer. | |
729 | * | |
730 | * Returns the updated pointer of the original string so that | |
731 | * it can be used for the next call. | |
732 | */ | |
733 | char *snd_info_get_str(char *dest, char *src, int len) | |
734 | { | |
735 | int c; | |
736 | ||
737 | while (*src == ' ' || *src == '\t') | |
738 | src++; | |
739 | if (*src == '"' || *src == '\'') { | |
740 | c = *src++; | |
741 | while (--len > 0 && *src && *src != c) { | |
742 | *dest++ = *src++; | |
743 | } | |
744 | if (*src == c) | |
745 | src++; | |
746 | } else { | |
747 | while (--len > 0 && *src && *src != ' ' && *src != '\t') { | |
748 | *dest++ = *src++; | |
749 | } | |
750 | } | |
751 | *dest = 0; | |
752 | while (*src == ' ' || *src == '\t') | |
753 | src++; | |
754 | return src; | |
755 | } | |
756 | ||
c0d3fb39 TI |
757 | EXPORT_SYMBOL(snd_info_get_str); |
758 | ||
1da177e4 LT |
759 | /** |
760 | * snd_info_create_entry - create an info entry | |
761 | * @name: the proc file name | |
762 | * | |
763 | * Creates an info entry with the given file name and initializes as | |
764 | * the default state. | |
765 | * | |
766 | * Usually called from other functions such as | |
767 | * snd_info_create_card_entry(). | |
768 | * | |
769 | * Returns the pointer of the new instance, or NULL on failure. | |
770 | */ | |
24c1f931 | 771 | static struct snd_info_entry *snd_info_create_entry(const char *name) |
1da177e4 | 772 | { |
24c1f931 | 773 | struct snd_info_entry *entry; |
ca2c0966 | 774 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
1da177e4 LT |
775 | if (entry == NULL) |
776 | return NULL; | |
543537bd | 777 | entry->name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
778 | if (entry->name == NULL) { |
779 | kfree(entry); | |
780 | return NULL; | |
781 | } | |
782 | entry->mode = S_IFREG | S_IRUGO; | |
783 | entry->content = SNDRV_INFO_CONTENT_TEXT; | |
1a60d4c5 | 784 | mutex_init(&entry->access); |
746d4a02 TI |
785 | INIT_LIST_HEAD(&entry->children); |
786 | INIT_LIST_HEAD(&entry->list); | |
1da177e4 LT |
787 | return entry; |
788 | } | |
789 | ||
790 | /** | |
791 | * snd_info_create_module_entry - create an info entry for the given module | |
792 | * @module: the module pointer | |
793 | * @name: the file name | |
794 | * @parent: the parent directory | |
795 | * | |
796 | * Creates a new info entry and assigns it to the given module. | |
797 | * | |
798 | * Returns the pointer of the new instance, or NULL on failure. | |
799 | */ | |
24c1f931 | 800 | struct snd_info_entry *snd_info_create_module_entry(struct module * module, |
1da177e4 | 801 | const char *name, |
24c1f931 | 802 | struct snd_info_entry *parent) |
1da177e4 | 803 | { |
24c1f931 | 804 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
805 | if (entry) { |
806 | entry->module = module; | |
807 | entry->parent = parent; | |
808 | } | |
809 | return entry; | |
810 | } | |
811 | ||
c0d3fb39 TI |
812 | EXPORT_SYMBOL(snd_info_create_module_entry); |
813 | ||
1da177e4 LT |
814 | /** |
815 | * snd_info_create_card_entry - create an info entry for the given card | |
816 | * @card: the card instance | |
817 | * @name: the file name | |
818 | * @parent: the parent directory | |
819 | * | |
820 | * Creates a new info entry and assigns it to the given card. | |
821 | * | |
822 | * Returns the pointer of the new instance, or NULL on failure. | |
823 | */ | |
24c1f931 | 824 | struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, |
1da177e4 | 825 | const char *name, |
24c1f931 | 826 | struct snd_info_entry * parent) |
1da177e4 | 827 | { |
24c1f931 | 828 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
829 | if (entry) { |
830 | entry->module = card->module; | |
831 | entry->card = card; | |
832 | entry->parent = parent; | |
833 | } | |
834 | return entry; | |
835 | } | |
836 | ||
c0d3fb39 TI |
837 | EXPORT_SYMBOL(snd_info_create_card_entry); |
838 | ||
746d4a02 | 839 | static void snd_info_disconnect(struct snd_info_entry *entry) |
1da177e4 | 840 | { |
746d4a02 TI |
841 | struct list_head *p, *n; |
842 | struct proc_dir_entry *root; | |
1da177e4 | 843 | |
746d4a02 TI |
844 | list_for_each_safe(p, n, &entry->children) { |
845 | snd_info_disconnect(list_entry(p, struct snd_info_entry, list)); | |
846 | } | |
847 | ||
848 | if (! entry->p) | |
849 | return; | |
850 | list_del_init(&entry->list); | |
851 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; | |
852 | snd_assert(root, return); | |
853 | snd_remove_proc_entry(root, entry->p); | |
854 | entry->p = NULL; | |
1da177e4 LT |
855 | } |
856 | ||
746d4a02 | 857 | static int snd_info_dev_free_entry(struct snd_device *device) |
1da177e4 | 858 | { |
24c1f931 | 859 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 860 | snd_info_free_entry(entry); |
1da177e4 LT |
861 | return 0; |
862 | } | |
863 | ||
746d4a02 | 864 | static int snd_info_dev_register_entry(struct snd_device *device) |
1da177e4 | 865 | { |
24c1f931 | 866 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 867 | return snd_info_register(entry); |
1da177e4 LT |
868 | } |
869 | ||
870 | /** | |
871 | * snd_card_proc_new - create an info entry for the given card | |
872 | * @card: the card instance | |
873 | * @name: the file name | |
874 | * @entryp: the pointer to store the new info entry | |
875 | * | |
876 | * Creates a new info entry and assigns it to the given card. | |
877 | * Unlike snd_info_create_card_entry(), this function registers the | |
878 | * info entry as an ALSA device component, so that it can be | |
879 | * unregistered/released without explicit call. | |
880 | * Also, you don't have to register this entry via snd_info_register(), | |
881 | * since this will be registered by snd_card_register() automatically. | |
882 | * | |
883 | * The parent is assumed as card->proc_root. | |
884 | * | |
885 | * For releasing this entry, use snd_device_free() instead of | |
886 | * snd_info_free_entry(). | |
887 | * | |
888 | * Returns zero if successful, or a negative error code on failure. | |
889 | */ | |
24c1f931 TI |
890 | int snd_card_proc_new(struct snd_card *card, const char *name, |
891 | struct snd_info_entry **entryp) | |
1da177e4 | 892 | { |
24c1f931 | 893 | static struct snd_device_ops ops = { |
1da177e4 LT |
894 | .dev_free = snd_info_dev_free_entry, |
895 | .dev_register = snd_info_dev_register_entry, | |
746d4a02 | 896 | /* disconnect is done via snd_info_card_disconnect() */ |
1da177e4 | 897 | }; |
24c1f931 | 898 | struct snd_info_entry *entry; |
1da177e4 LT |
899 | int err; |
900 | ||
901 | entry = snd_info_create_card_entry(card, name, card->proc_root); | |
902 | if (! entry) | |
903 | return -ENOMEM; | |
904 | if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) { | |
905 | snd_info_free_entry(entry); | |
906 | return err; | |
907 | } | |
908 | if (entryp) | |
909 | *entryp = entry; | |
910 | return 0; | |
911 | } | |
912 | ||
c0d3fb39 TI |
913 | EXPORT_SYMBOL(snd_card_proc_new); |
914 | ||
1da177e4 LT |
915 | /** |
916 | * snd_info_free_entry - release the info entry | |
917 | * @entry: the info entry | |
918 | * | |
919 | * Releases the info entry. Don't call this after registered. | |
920 | */ | |
24c1f931 | 921 | void snd_info_free_entry(struct snd_info_entry * entry) |
1da177e4 LT |
922 | { |
923 | if (entry == NULL) | |
924 | return; | |
746d4a02 TI |
925 | if (entry->p) { |
926 | mutex_lock(&info_mutex); | |
927 | snd_info_disconnect(entry); | |
928 | mutex_unlock(&info_mutex); | |
929 | } | |
1da177e4 LT |
930 | kfree(entry->name); |
931 | if (entry->private_free) | |
932 | entry->private_free(entry); | |
933 | kfree(entry); | |
934 | } | |
935 | ||
c0d3fb39 TI |
936 | EXPORT_SYMBOL(snd_info_free_entry); |
937 | ||
1da177e4 LT |
938 | /** |
939 | * snd_info_register - register the info entry | |
940 | * @entry: the info entry | |
941 | * | |
942 | * Registers the proc info entry. | |
943 | * | |
944 | * Returns zero if successful, or a negative error code on failure. | |
945 | */ | |
24c1f931 | 946 | int snd_info_register(struct snd_info_entry * entry) |
1da177e4 LT |
947 | { |
948 | struct proc_dir_entry *root, *p = NULL; | |
949 | ||
950 | snd_assert(entry != NULL, return -ENXIO); | |
951 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; | |
1a60d4c5 | 952 | mutex_lock(&info_mutex); |
1da177e4 LT |
953 | p = snd_create_proc_entry(entry->name, entry->mode, root); |
954 | if (!p) { | |
1a60d4c5 | 955 | mutex_unlock(&info_mutex); |
1da177e4 LT |
956 | return -ENOMEM; |
957 | } | |
958 | p->owner = entry->module; | |
959 | if (!S_ISDIR(entry->mode)) | |
960 | p->proc_fops = &snd_info_entry_operations; | |
961 | p->size = entry->size; | |
962 | p->data = entry; | |
963 | entry->p = p; | |
746d4a02 TI |
964 | if (entry->parent) |
965 | list_add_tail(&entry->list, &entry->parent->children); | |
1a60d4c5 | 966 | mutex_unlock(&info_mutex); |
1da177e4 LT |
967 | return 0; |
968 | } | |
969 | ||
c0d3fb39 TI |
970 | EXPORT_SYMBOL(snd_info_register); |
971 | ||
1da177e4 LT |
972 | /* |
973 | ||
974 | */ | |
975 | ||
6581f4e7 | 976 | static struct snd_info_entry *snd_info_version_entry; |
1da177e4 | 977 | |
24c1f931 | 978 | static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) |
1da177e4 LT |
979 | { |
980 | snd_iprintf(buffer, | |
981 | "Advanced Linux Sound Architecture Driver Version " | |
982 | CONFIG_SND_VERSION CONFIG_SND_DATE ".\n" | |
983 | ); | |
984 | } | |
985 | ||
986 | static int __init snd_info_version_init(void) | |
987 | { | |
24c1f931 | 988 | struct snd_info_entry *entry; |
1da177e4 LT |
989 | |
990 | entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL); | |
991 | if (entry == NULL) | |
992 | return -ENOMEM; | |
1da177e4 LT |
993 | entry->c.text.read = snd_info_version_read; |
994 | if (snd_info_register(entry) < 0) { | |
995 | snd_info_free_entry(entry); | |
996 | return -ENOMEM; | |
997 | } | |
998 | snd_info_version_entry = entry; | |
999 | return 0; | |
1000 | } | |
1001 | ||
1002 | static int __exit snd_info_version_done(void) | |
1003 | { | |
746d4a02 | 1004 | snd_info_free_entry(snd_info_version_entry); |
1da177e4 LT |
1005 | return 0; |
1006 | } | |
1007 | ||
1008 | #endif /* CONFIG_PROC_FS */ |