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