Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Information interface for ALSA driver | |
c1017a4c | 3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
4 | * |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | */ | |
21 | ||
1da177e4 | 22 | #include <linux/init.h> |
1da177e4 LT |
23 | #include <linux/time.h> |
24 | #include <linux/smp_lock.h> | |
543537bd | 25 | #include <linux/string.h> |
1da177e4 LT |
26 | #include <sound/core.h> |
27 | #include <sound/minors.h> | |
28 | #include <sound/info.h> | |
29 | #include <sound/version.h> | |
30 | #include <linux/proc_fs.h> | |
1a60d4c5 | 31 | #include <linux/mutex.h> |
1da177e4 LT |
32 | #include <stdarg.h> |
33 | ||
34 | /* | |
35 | * | |
36 | */ | |
37 | ||
e28563cc TI |
38 | #ifdef CONFIG_PROC_FS |
39 | ||
1da177e4 LT |
40 | int snd_info_check_reserved_words(const char *str) |
41 | { | |
42 | static char *reserved[] = | |
43 | { | |
44 | "version", | |
45 | "meminfo", | |
46 | "memdebug", | |
47 | "detect", | |
48 | "devices", | |
49 | "oss", | |
50 | "cards", | |
51 | "timers", | |
52 | "synth", | |
53 | "pcm", | |
54 | "seq", | |
55 | NULL | |
56 | }; | |
57 | char **xstr = reserved; | |
58 | ||
59 | while (*xstr) { | |
60 | if (!strcmp(*xstr, str)) | |
61 | return 0; | |
62 | xstr++; | |
63 | } | |
64 | if (!strncmp(str, "card", 4)) | |
65 | return 0; | |
66 | return 1; | |
67 | } | |
68 | ||
1a60d4c5 | 69 | static DEFINE_MUTEX(info_mutex); |
1da177e4 | 70 | |
24c1f931 TI |
71 | struct snd_info_private_data { |
72 | struct snd_info_buffer *rbuffer; | |
73 | struct snd_info_buffer *wbuffer; | |
74 | struct snd_info_entry *entry; | |
1da177e4 | 75 | void *file_private_data; |
24c1f931 | 76 | }; |
1da177e4 LT |
77 | |
78 | static int snd_info_version_init(void); | |
79 | static int snd_info_version_done(void); | |
746d4a02 | 80 | static void snd_info_disconnect(struct snd_info_entry *entry); |
1da177e4 LT |
81 | |
82 | ||
7e4eeec8 TI |
83 | /* resize the proc r/w buffer */ |
84 | static int resize_info_buffer(struct snd_info_buffer *buffer, | |
85 | unsigned int nsize) | |
86 | { | |
87 | char *nbuf; | |
88 | ||
89 | nsize = PAGE_ALIGN(nsize); | |
90 | nbuf = kmalloc(nsize, GFP_KERNEL); | |
91 | if (! nbuf) | |
92 | return -ENOMEM; | |
93 | ||
94 | memcpy(nbuf, buffer->buffer, buffer->len); | |
95 | kfree(buffer->buffer); | |
96 | buffer->buffer = nbuf; | |
97 | buffer->len = nsize; | |
98 | return 0; | |
99 | } | |
100 | ||
1da177e4 LT |
101 | /** |
102 | * snd_iprintf - printf on the procfs buffer | |
103 | * @buffer: the procfs buffer | |
104 | * @fmt: the printf format | |
105 | * | |
106 | * Outputs the string on the procfs buffer just like printf(). | |
107 | * | |
108 | * Returns the size of output string. | |
109 | */ | |
24c1f931 | 110 | int snd_iprintf(struct snd_info_buffer *buffer, char *fmt,...) |
1da177e4 LT |
111 | { |
112 | va_list args; | |
113 | int len, res; | |
7e4eeec8 | 114 | int err = 0; |
1da177e4 | 115 | |
f001c3ac | 116 | might_sleep(); |
1da177e4 LT |
117 | if (buffer->stop || buffer->error) |
118 | return 0; | |
119 | len = buffer->len - buffer->size; | |
120 | va_start(args, fmt); | |
7e4eeec8 | 121 | for (;;) { |
dbedca39 TI |
122 | va_list ap; |
123 | va_copy(ap, args); | |
124 | res = vsnprintf(buffer->buffer + buffer->curr, len, fmt, ap); | |
125 | va_end(ap); | |
7e4eeec8 TI |
126 | if (res < len) |
127 | break; | |
128 | err = resize_info_buffer(buffer, buffer->len + PAGE_SIZE); | |
129 | if (err < 0) | |
130 | break; | |
131 | len = buffer->len - buffer->size; | |
1da177e4 | 132 | } |
7e4eeec8 TI |
133 | va_end(args); |
134 | ||
135 | if (err < 0) | |
136 | return err; | |
1da177e4 LT |
137 | buffer->curr += res; |
138 | buffer->size += res; | |
139 | return res; | |
140 | } | |
141 | ||
c0d3fb39 TI |
142 | EXPORT_SYMBOL(snd_iprintf); |
143 | ||
1da177e4 LT |
144 | /* |
145 | ||
146 | */ | |
147 | ||
6581f4e7 TI |
148 | static struct proc_dir_entry *snd_proc_root; |
149 | struct snd_info_entry *snd_seq_root; | |
c0d3fb39 TI |
150 | EXPORT_SYMBOL(snd_seq_root); |
151 | ||
1da177e4 | 152 | #ifdef CONFIG_SND_OSSEMUL |
6581f4e7 | 153 | struct snd_info_entry *snd_oss_root; |
1da177e4 LT |
154 | #endif |
155 | ||
156 | static inline void snd_info_entry_prepare(struct proc_dir_entry *de) | |
157 | { | |
158 | de->owner = THIS_MODULE; | |
159 | } | |
160 | ||
161 | static void snd_remove_proc_entry(struct proc_dir_entry *parent, | |
162 | struct proc_dir_entry *de) | |
163 | { | |
164 | if (de) | |
165 | remove_proc_entry(de->name, parent); | |
166 | } | |
167 | ||
168 | static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig) | |
169 | { | |
24c1f931 | 170 | struct snd_info_private_data *data; |
1da177e4 LT |
171 | struct snd_info_entry *entry; |
172 | loff_t ret; | |
173 | ||
174 | data = file->private_data; | |
175 | entry = data->entry; | |
176 | lock_kernel(); | |
177 | switch (entry->content) { | |
178 | case SNDRV_INFO_CONTENT_TEXT: | |
179 | switch (orig) { | |
e6f8f108 | 180 | case SEEK_SET: |
1da177e4 LT |
181 | file->f_pos = offset; |
182 | ret = file->f_pos; | |
183 | goto out; | |
e6f8f108 | 184 | case SEEK_CUR: |
1da177e4 LT |
185 | file->f_pos += offset; |
186 | ret = file->f_pos; | |
187 | goto out; | |
e6f8f108 | 188 | case SEEK_END: |
1da177e4 LT |
189 | default: |
190 | ret = -EINVAL; | |
191 | goto out; | |
192 | } | |
193 | break; | |
194 | case SNDRV_INFO_CONTENT_DATA: | |
195 | if (entry->c.ops->llseek) { | |
196 | ret = entry->c.ops->llseek(entry, | |
197 | data->file_private_data, | |
198 | file, offset, orig); | |
199 | goto out; | |
200 | } | |
201 | break; | |
202 | } | |
203 | ret = -ENXIO; | |
204 | out: | |
205 | unlock_kernel(); | |
206 | return ret; | |
207 | } | |
208 | ||
209 | static ssize_t snd_info_entry_read(struct file *file, char __user *buffer, | |
210 | size_t count, loff_t * offset) | |
211 | { | |
24c1f931 | 212 | struct snd_info_private_data *data; |
1da177e4 | 213 | struct snd_info_entry *entry; |
24c1f931 | 214 | struct snd_info_buffer *buf; |
1da177e4 LT |
215 | size_t size = 0; |
216 | loff_t pos; | |
217 | ||
218 | data = file->private_data; | |
219 | snd_assert(data != NULL, return -ENXIO); | |
220 | pos = *offset; | |
221 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
222 | return -EIO; | |
223 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
224 | return -EIO; | |
225 | entry = data->entry; | |
226 | switch (entry->content) { | |
227 | case SNDRV_INFO_CONTENT_TEXT: | |
228 | buf = data->rbuffer; | |
229 | if (buf == NULL) | |
230 | return -EIO; | |
231 | if (pos >= buf->size) | |
232 | return 0; | |
233 | size = buf->size - pos; | |
234 | size = min(count, size); | |
235 | if (copy_to_user(buffer, buf->buffer + pos, size)) | |
236 | return -EFAULT; | |
237 | break; | |
238 | case SNDRV_INFO_CONTENT_DATA: | |
239 | if (entry->c.ops->read) | |
240 | size = entry->c.ops->read(entry, | |
241 | data->file_private_data, | |
242 | file, buffer, count, pos); | |
243 | break; | |
244 | } | |
245 | if ((ssize_t) size > 0) | |
246 | *offset = pos + size; | |
247 | return size; | |
248 | } | |
249 | ||
250 | static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer, | |
251 | size_t count, loff_t * offset) | |
252 | { | |
24c1f931 | 253 | struct snd_info_private_data *data; |
1da177e4 | 254 | struct snd_info_entry *entry; |
24c1f931 | 255 | struct snd_info_buffer *buf; |
7e4eeec8 | 256 | ssize_t size = 0; |
1da177e4 LT |
257 | loff_t pos; |
258 | ||
259 | data = file->private_data; | |
260 | snd_assert(data != NULL, return -ENXIO); | |
261 | entry = data->entry; | |
262 | pos = *offset; | |
263 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
264 | return -EIO; | |
265 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
266 | return -EIO; | |
267 | switch (entry->content) { | |
268 | case SNDRV_INFO_CONTENT_TEXT: | |
269 | buf = data->wbuffer; | |
270 | if (buf == NULL) | |
271 | return -EIO; | |
f4a747f1 | 272 | mutex_lock(&entry->access); |
7e4eeec8 TI |
273 | if (pos + count >= buf->len) { |
274 | if (resize_info_buffer(buf, pos + count)) { | |
275 | mutex_unlock(&entry->access); | |
276 | return -ENOMEM; | |
277 | } | |
278 | } | |
279 | if (copy_from_user(buf->buffer + pos, buffer, count)) { | |
280 | mutex_unlock(&entry->access); | |
1da177e4 | 281 | return -EFAULT; |
7e4eeec8 TI |
282 | } |
283 | buf->size = pos + count; | |
284 | mutex_unlock(&entry->access); | |
285 | size = count; | |
1da177e4 LT |
286 | break; |
287 | case SNDRV_INFO_CONTENT_DATA: | |
288 | if (entry->c.ops->write) | |
289 | size = entry->c.ops->write(entry, | |
290 | data->file_private_data, | |
291 | file, buffer, count, pos); | |
292 | break; | |
293 | } | |
294 | if ((ssize_t) size > 0) | |
295 | *offset = pos + size; | |
296 | return size; | |
297 | } | |
298 | ||
299 | static int snd_info_entry_open(struct inode *inode, struct file *file) | |
300 | { | |
24c1f931 TI |
301 | struct snd_info_entry *entry; |
302 | struct snd_info_private_data *data; | |
303 | struct snd_info_buffer *buffer; | |
1da177e4 LT |
304 | struct proc_dir_entry *p; |
305 | int mode, err; | |
306 | ||
1a60d4c5 | 307 | mutex_lock(&info_mutex); |
1da177e4 | 308 | p = PDE(inode); |
24c1f931 | 309 | entry = p == NULL ? NULL : (struct snd_info_entry *)p->data; |
746d4a02 | 310 | if (entry == NULL || ! entry->p) { |
1a60d4c5 | 311 | mutex_unlock(&info_mutex); |
1da177e4 LT |
312 | return -ENODEV; |
313 | } | |
314 | if (!try_module_get(entry->module)) { | |
315 | err = -EFAULT; | |
316 | goto __error1; | |
317 | } | |
318 | mode = file->f_flags & O_ACCMODE; | |
319 | if (mode == O_RDONLY || mode == O_RDWR) { | |
7e4eeec8 | 320 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
1da177e4 LT |
321 | entry->c.ops->read == NULL)) { |
322 | err = -ENODEV; | |
323 | goto __error; | |
324 | } | |
325 | } | |
326 | if (mode == O_WRONLY || mode == O_RDWR) { | |
7e4eeec8 | 327 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
1da177e4 LT |
328 | entry->c.ops->write == NULL)) { |
329 | err = -ENODEV; | |
330 | goto __error; | |
331 | } | |
332 | } | |
ca2c0966 | 333 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
334 | if (data == NULL) { |
335 | err = -ENOMEM; | |
336 | goto __error; | |
337 | } | |
338 | data->entry = entry; | |
339 | switch (entry->content) { | |
340 | case SNDRV_INFO_CONTENT_TEXT: | |
341 | if (mode == O_RDONLY || mode == O_RDWR) { | |
ca2c0966 | 342 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
7e4eeec8 TI |
343 | if (buffer == NULL) |
344 | goto __nomem; | |
1da177e4 | 345 | data->rbuffer = buffer; |
7e4eeec8 TI |
346 | buffer->len = PAGE_SIZE; |
347 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); | |
348 | if (buffer->buffer == NULL) | |
349 | goto __nomem; | |
1da177e4 LT |
350 | } |
351 | if (mode == O_WRONLY || mode == O_RDWR) { | |
ca2c0966 | 352 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
7e4eeec8 TI |
353 | if (buffer == NULL) |
354 | goto __nomem; | |
1da177e4 | 355 | data->wbuffer = buffer; |
7e4eeec8 TI |
356 | buffer->len = PAGE_SIZE; |
357 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); | |
358 | if (buffer->buffer == NULL) | |
359 | goto __nomem; | |
1da177e4 LT |
360 | } |
361 | break; | |
362 | case SNDRV_INFO_CONTENT_DATA: /* data */ | |
363 | if (entry->c.ops->open) { | |
364 | if ((err = entry->c.ops->open(entry, mode, | |
365 | &data->file_private_data)) < 0) { | |
366 | kfree(data); | |
367 | goto __error; | |
368 | } | |
369 | } | |
370 | break; | |
371 | } | |
372 | file->private_data = data; | |
1a60d4c5 | 373 | mutex_unlock(&info_mutex); |
1da177e4 LT |
374 | if (entry->content == SNDRV_INFO_CONTENT_TEXT && |
375 | (mode == O_RDONLY || mode == O_RDWR)) { | |
376 | if (entry->c.text.read) { | |
1a60d4c5 | 377 | mutex_lock(&entry->access); |
1da177e4 | 378 | entry->c.text.read(entry, data->rbuffer); |
1a60d4c5 | 379 | mutex_unlock(&entry->access); |
1da177e4 LT |
380 | } |
381 | } | |
382 | return 0; | |
383 | ||
7e4eeec8 TI |
384 | __nomem: |
385 | if (data->rbuffer) { | |
386 | kfree(data->rbuffer->buffer); | |
387 | kfree(data->rbuffer); | |
388 | } | |
389 | if (data->wbuffer) { | |
390 | kfree(data->wbuffer->buffer); | |
391 | kfree(data->wbuffer); | |
392 | } | |
393 | kfree(data); | |
394 | err = -ENOMEM; | |
1da177e4 LT |
395 | __error: |
396 | module_put(entry->module); | |
397 | __error1: | |
1a60d4c5 | 398 | mutex_unlock(&info_mutex); |
1da177e4 LT |
399 | return err; |
400 | } | |
401 | ||
402 | static int snd_info_entry_release(struct inode *inode, struct file *file) | |
403 | { | |
24c1f931 TI |
404 | struct snd_info_entry *entry; |
405 | struct snd_info_private_data *data; | |
1da177e4 LT |
406 | int mode; |
407 | ||
408 | mode = file->f_flags & O_ACCMODE; | |
409 | data = file->private_data; | |
410 | entry = data->entry; | |
411 | switch (entry->content) { | |
412 | case SNDRV_INFO_CONTENT_TEXT: | |
7e4eeec8 TI |
413 | if (data->rbuffer) { |
414 | kfree(data->rbuffer->buffer); | |
1da177e4 LT |
415 | kfree(data->rbuffer); |
416 | } | |
7e4eeec8 | 417 | if (data->wbuffer) { |
1da177e4 LT |
418 | if (entry->c.text.write) { |
419 | entry->c.text.write(entry, data->wbuffer); | |
420 | if (data->wbuffer->error) { | |
421 | snd_printk(KERN_WARNING "data write error to %s (%i)\n", | |
422 | entry->name, | |
423 | data->wbuffer->error); | |
424 | } | |
425 | } | |
7e4eeec8 | 426 | kfree(data->wbuffer->buffer); |
1da177e4 LT |
427 | kfree(data->wbuffer); |
428 | } | |
429 | break; | |
430 | case SNDRV_INFO_CONTENT_DATA: | |
431 | if (entry->c.ops->release) | |
432 | entry->c.ops->release(entry, mode, | |
433 | data->file_private_data); | |
434 | break; | |
435 | } | |
436 | module_put(entry->module); | |
437 | kfree(data); | |
438 | return 0; | |
439 | } | |
440 | ||
441 | static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait) | |
442 | { | |
24c1f931 | 443 | struct snd_info_private_data *data; |
1da177e4 LT |
444 | struct snd_info_entry *entry; |
445 | unsigned int mask; | |
446 | ||
447 | data = file->private_data; | |
448 | if (data == NULL) | |
449 | return 0; | |
450 | entry = data->entry; | |
451 | mask = 0; | |
452 | switch (entry->content) { | |
453 | case SNDRV_INFO_CONTENT_DATA: | |
454 | if (entry->c.ops->poll) | |
455 | return entry->c.ops->poll(entry, | |
456 | data->file_private_data, | |
457 | file, wait); | |
458 | if (entry->c.ops->read) | |
459 | mask |= POLLIN | POLLRDNORM; | |
460 | if (entry->c.ops->write) | |
461 | mask |= POLLOUT | POLLWRNORM; | |
462 | break; | |
463 | } | |
464 | return mask; | |
465 | } | |
466 | ||
d99e9889 IM |
467 | static long snd_info_entry_ioctl(struct file *file, unsigned int cmd, |
468 | unsigned long arg) | |
1da177e4 | 469 | { |
24c1f931 | 470 | struct snd_info_private_data *data; |
1da177e4 LT |
471 | struct snd_info_entry *entry; |
472 | ||
473 | data = file->private_data; | |
474 | if (data == NULL) | |
475 | return 0; | |
476 | entry = data->entry; | |
477 | switch (entry->content) { | |
478 | case SNDRV_INFO_CONTENT_DATA: | |
479 | if (entry->c.ops->ioctl) | |
480 | return entry->c.ops->ioctl(entry, | |
481 | data->file_private_data, | |
482 | file, cmd, arg); | |
483 | break; | |
484 | } | |
485 | return -ENOTTY; | |
486 | } | |
487 | ||
1da177e4 LT |
488 | static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma) |
489 | { | |
7bc56323 | 490 | struct inode *inode = file->f_path.dentry->d_inode; |
24c1f931 | 491 | struct snd_info_private_data *data; |
1da177e4 LT |
492 | struct snd_info_entry *entry; |
493 | ||
494 | data = file->private_data; | |
495 | if (data == NULL) | |
496 | return 0; | |
497 | entry = data->entry; | |
498 | switch (entry->content) { | |
499 | case SNDRV_INFO_CONTENT_DATA: | |
500 | if (entry->c.ops->mmap) | |
501 | return entry->c.ops->mmap(entry, | |
502 | data->file_private_data, | |
503 | inode, file, vma); | |
504 | break; | |
505 | } | |
506 | return -ENXIO; | |
507 | } | |
508 | ||
9c2e08c5 | 509 | static const struct file_operations snd_info_entry_operations = |
1da177e4 | 510 | { |
d99e9889 IM |
511 | .owner = THIS_MODULE, |
512 | .llseek = snd_info_entry_llseek, | |
513 | .read = snd_info_entry_read, | |
514 | .write = snd_info_entry_write, | |
515 | .poll = snd_info_entry_poll, | |
516 | .unlocked_ioctl = snd_info_entry_ioctl, | |
517 | .mmap = snd_info_entry_mmap, | |
518 | .open = snd_info_entry_open, | |
519 | .release = snd_info_entry_release, | |
1da177e4 LT |
520 | }; |
521 | ||
522 | /** | |
523 | * snd_create_proc_entry - create a procfs entry | |
524 | * @name: the name of the proc file | |
525 | * @mode: the file permission bits, S_Ixxx | |
526 | * @parent: the parent proc-directory entry | |
527 | * | |
528 | * Creates a new proc file entry with the given name and permission | |
529 | * on the given directory. | |
530 | * | |
531 | * Returns the pointer of new instance or NULL on failure. | |
532 | */ | |
533 | static struct proc_dir_entry *snd_create_proc_entry(const char *name, mode_t mode, | |
534 | struct proc_dir_entry *parent) | |
535 | { | |
536 | struct proc_dir_entry *p; | |
537 | p = create_proc_entry(name, mode, parent); | |
538 | if (p) | |
539 | snd_info_entry_prepare(p); | |
540 | return p; | |
541 | } | |
542 | ||
543 | int __init snd_info_init(void) | |
544 | { | |
545 | struct proc_dir_entry *p; | |
546 | ||
547 | p = snd_create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, &proc_root); | |
548 | if (p == NULL) | |
549 | return -ENOMEM; | |
550 | snd_proc_root = p; | |
551 | #ifdef CONFIG_SND_OSSEMUL | |
552 | { | |
24c1f931 | 553 | struct snd_info_entry *entry; |
1da177e4 LT |
554 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL) |
555 | return -ENOMEM; | |
556 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
557 | if (snd_info_register(entry) < 0) { | |
558 | snd_info_free_entry(entry); | |
559 | return -ENOMEM; | |
560 | } | |
561 | snd_oss_root = entry; | |
562 | } | |
563 | #endif | |
564 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
565 | { | |
24c1f931 | 566 | struct snd_info_entry *entry; |
1da177e4 LT |
567 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL) |
568 | return -ENOMEM; | |
569 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
570 | if (snd_info_register(entry) < 0) { | |
571 | snd_info_free_entry(entry); | |
572 | return -ENOMEM; | |
573 | } | |
574 | snd_seq_root = entry; | |
575 | } | |
576 | #endif | |
577 | snd_info_version_init(); | |
1da177e4 LT |
578 | snd_minor_info_init(); |
579 | snd_minor_info_oss_init(); | |
580 | snd_card_info_init(); | |
581 | return 0; | |
582 | } | |
583 | ||
584 | int __exit snd_info_done(void) | |
585 | { | |
586 | snd_card_info_done(); | |
587 | snd_minor_info_oss_done(); | |
588 | snd_minor_info_done(); | |
1da177e4 LT |
589 | snd_info_version_done(); |
590 | if (snd_proc_root) { | |
591 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
746d4a02 | 592 | snd_info_free_entry(snd_seq_root); |
1da177e4 LT |
593 | #endif |
594 | #ifdef CONFIG_SND_OSSEMUL | |
746d4a02 | 595 | snd_info_free_entry(snd_oss_root); |
1da177e4 LT |
596 | #endif |
597 | snd_remove_proc_entry(&proc_root, snd_proc_root); | |
598 | } | |
599 | return 0; | |
600 | } | |
601 | ||
602 | /* | |
603 | ||
604 | */ | |
605 | ||
606 | ||
607 | /* | |
608 | * create a card proc file | |
609 | * called from init.c | |
610 | */ | |
24c1f931 | 611 | int snd_info_card_create(struct snd_card *card) |
1da177e4 LT |
612 | { |
613 | char str[8]; | |
24c1f931 | 614 | struct snd_info_entry *entry; |
1da177e4 LT |
615 | |
616 | snd_assert(card != NULL, return -ENXIO); | |
617 | ||
618 | sprintf(str, "card%i", card->number); | |
619 | if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL) | |
620 | return -ENOMEM; | |
621 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
622 | if (snd_info_register(entry) < 0) { | |
623 | snd_info_free_entry(entry); | |
624 | return -ENOMEM; | |
625 | } | |
626 | card->proc_root = entry; | |
627 | return 0; | |
628 | } | |
629 | ||
630 | /* | |
631 | * register the card proc file | |
632 | * called from init.c | |
633 | */ | |
24c1f931 | 634 | int snd_info_card_register(struct snd_card *card) |
1da177e4 LT |
635 | { |
636 | struct proc_dir_entry *p; | |
637 | ||
638 | snd_assert(card != NULL, return -ENXIO); | |
639 | ||
640 | if (!strcmp(card->id, card->proc_root->name)) | |
641 | return 0; | |
642 | ||
643 | p = proc_symlink(card->id, snd_proc_root, card->proc_root->name); | |
644 | if (p == NULL) | |
645 | return -ENOMEM; | |
646 | card->proc_root_link = p; | |
647 | return 0; | |
648 | } | |
649 | ||
650 | /* | |
651 | * de-register the card proc file | |
652 | * called from init.c | |
653 | */ | |
746d4a02 | 654 | void snd_info_card_disconnect(struct snd_card *card) |
1da177e4 | 655 | { |
746d4a02 TI |
656 | snd_assert(card != NULL, return); |
657 | mutex_lock(&info_mutex); | |
1da177e4 LT |
658 | if (card->proc_root_link) { |
659 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); | |
660 | card->proc_root_link = NULL; | |
661 | } | |
746d4a02 TI |
662 | if (card->proc_root) |
663 | snd_info_disconnect(card->proc_root); | |
664 | mutex_unlock(&info_mutex); | |
665 | } | |
666 | ||
667 | /* | |
668 | * release the card proc file resources | |
669 | * called from init.c | |
670 | */ | |
671 | int snd_info_card_free(struct snd_card *card) | |
672 | { | |
673 | snd_assert(card != NULL, return -ENXIO); | |
674 | snd_info_free_entry(card->proc_root); | |
675 | card->proc_root = NULL; | |
1da177e4 LT |
676 | return 0; |
677 | } | |
678 | ||
679 | ||
680 | /** | |
681 | * snd_info_get_line - read one line from the procfs buffer | |
682 | * @buffer: the procfs buffer | |
683 | * @line: the buffer to store | |
684 | * @len: the max. buffer size - 1 | |
685 | * | |
686 | * Reads one line from the buffer and stores the string. | |
687 | * | |
688 | * Returns zero if successful, or 1 if error or EOF. | |
689 | */ | |
24c1f931 | 690 | int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) |
1da177e4 LT |
691 | { |
692 | int c = -1; | |
693 | ||
694 | if (len <= 0 || buffer->stop || buffer->error) | |
695 | return 1; | |
696 | while (--len > 0) { | |
7e4eeec8 | 697 | c = buffer->buffer[buffer->curr++]; |
1da177e4 | 698 | if (c == '\n') { |
7e4eeec8 | 699 | if (buffer->curr >= buffer->size) |
1da177e4 | 700 | buffer->stop = 1; |
1da177e4 LT |
701 | break; |
702 | } | |
703 | *line++ = c; | |
7e4eeec8 | 704 | if (buffer->curr >= buffer->size) { |
1da177e4 LT |
705 | buffer->stop = 1; |
706 | break; | |
707 | } | |
708 | } | |
709 | while (c != '\n' && !buffer->stop) { | |
7e4eeec8 TI |
710 | c = buffer->buffer[buffer->curr++]; |
711 | if (buffer->curr >= buffer->size) | |
1da177e4 | 712 | buffer->stop = 1; |
1da177e4 LT |
713 | } |
714 | *line = '\0'; | |
715 | return 0; | |
716 | } | |
717 | ||
c0d3fb39 TI |
718 | EXPORT_SYMBOL(snd_info_get_line); |
719 | ||
1da177e4 | 720 | /** |
856def8a | 721 | * snd_info_get_str - parse a string token |
1da177e4 LT |
722 | * @dest: the buffer to store the string token |
723 | * @src: the original string | |
724 | * @len: the max. length of token - 1 | |
725 | * | |
726 | * Parses the original string and copy a token to the given | |
727 | * string buffer. | |
728 | * | |
729 | * Returns the updated pointer of the original string so that | |
730 | * it can be used for the next call. | |
731 | */ | |
732 | char *snd_info_get_str(char *dest, char *src, int len) | |
733 | { | |
734 | int c; | |
735 | ||
736 | while (*src == ' ' || *src == '\t') | |
737 | src++; | |
738 | if (*src == '"' || *src == '\'') { | |
739 | c = *src++; | |
740 | while (--len > 0 && *src && *src != c) { | |
741 | *dest++ = *src++; | |
742 | } | |
743 | if (*src == c) | |
744 | src++; | |
745 | } else { | |
746 | while (--len > 0 && *src && *src != ' ' && *src != '\t') { | |
747 | *dest++ = *src++; | |
748 | } | |
749 | } | |
750 | *dest = 0; | |
751 | while (*src == ' ' || *src == '\t') | |
752 | src++; | |
753 | return src; | |
754 | } | |
755 | ||
c0d3fb39 TI |
756 | EXPORT_SYMBOL(snd_info_get_str); |
757 | ||
1da177e4 LT |
758 | /** |
759 | * snd_info_create_entry - create an info entry | |
760 | * @name: the proc file name | |
761 | * | |
762 | * Creates an info entry with the given file name and initializes as | |
763 | * the default state. | |
764 | * | |
765 | * Usually called from other functions such as | |
766 | * snd_info_create_card_entry(). | |
767 | * | |
768 | * Returns the pointer of the new instance, or NULL on failure. | |
769 | */ | |
24c1f931 | 770 | static struct snd_info_entry *snd_info_create_entry(const char *name) |
1da177e4 | 771 | { |
24c1f931 | 772 | struct snd_info_entry *entry; |
ca2c0966 | 773 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
1da177e4 LT |
774 | if (entry == NULL) |
775 | return NULL; | |
543537bd | 776 | entry->name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
777 | if (entry->name == NULL) { |
778 | kfree(entry); | |
779 | return NULL; | |
780 | } | |
781 | entry->mode = S_IFREG | S_IRUGO; | |
782 | entry->content = SNDRV_INFO_CONTENT_TEXT; | |
1a60d4c5 | 783 | mutex_init(&entry->access); |
746d4a02 TI |
784 | INIT_LIST_HEAD(&entry->children); |
785 | INIT_LIST_HEAD(&entry->list); | |
1da177e4 LT |
786 | return entry; |
787 | } | |
788 | ||
789 | /** | |
790 | * snd_info_create_module_entry - create an info entry for the given module | |
791 | * @module: the module pointer | |
792 | * @name: the file name | |
793 | * @parent: the parent directory | |
794 | * | |
795 | * Creates a new info entry and assigns it to the given module. | |
796 | * | |
797 | * Returns the pointer of the new instance, or NULL on failure. | |
798 | */ | |
24c1f931 | 799 | struct snd_info_entry *snd_info_create_module_entry(struct module * module, |
1da177e4 | 800 | const char *name, |
24c1f931 | 801 | struct snd_info_entry *parent) |
1da177e4 | 802 | { |
24c1f931 | 803 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
804 | if (entry) { |
805 | entry->module = module; | |
806 | entry->parent = parent; | |
807 | } | |
808 | return entry; | |
809 | } | |
810 | ||
c0d3fb39 TI |
811 | EXPORT_SYMBOL(snd_info_create_module_entry); |
812 | ||
1da177e4 LT |
813 | /** |
814 | * snd_info_create_card_entry - create an info entry for the given card | |
815 | * @card: the card instance | |
816 | * @name: the file name | |
817 | * @parent: the parent directory | |
818 | * | |
819 | * Creates a new info entry and assigns it to the given card. | |
820 | * | |
821 | * Returns the pointer of the new instance, or NULL on failure. | |
822 | */ | |
24c1f931 | 823 | struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, |
1da177e4 | 824 | const char *name, |
24c1f931 | 825 | struct snd_info_entry * parent) |
1da177e4 | 826 | { |
24c1f931 | 827 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
828 | if (entry) { |
829 | entry->module = card->module; | |
830 | entry->card = card; | |
831 | entry->parent = parent; | |
832 | } | |
833 | return entry; | |
834 | } | |
835 | ||
c0d3fb39 TI |
836 | EXPORT_SYMBOL(snd_info_create_card_entry); |
837 | ||
746d4a02 | 838 | static void snd_info_disconnect(struct snd_info_entry *entry) |
1da177e4 | 839 | { |
746d4a02 TI |
840 | struct list_head *p, *n; |
841 | struct proc_dir_entry *root; | |
1da177e4 | 842 | |
746d4a02 TI |
843 | list_for_each_safe(p, n, &entry->children) { |
844 | snd_info_disconnect(list_entry(p, struct snd_info_entry, list)); | |
845 | } | |
846 | ||
847 | if (! entry->p) | |
848 | return; | |
849 | list_del_init(&entry->list); | |
850 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; | |
851 | snd_assert(root, return); | |
852 | snd_remove_proc_entry(root, entry->p); | |
853 | entry->p = NULL; | |
1da177e4 LT |
854 | } |
855 | ||
746d4a02 | 856 | static int snd_info_dev_free_entry(struct snd_device *device) |
1da177e4 | 857 | { |
24c1f931 | 858 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 859 | snd_info_free_entry(entry); |
1da177e4 LT |
860 | return 0; |
861 | } | |
862 | ||
746d4a02 | 863 | static int snd_info_dev_register_entry(struct snd_device *device) |
1da177e4 | 864 | { |
24c1f931 | 865 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 866 | return snd_info_register(entry); |
1da177e4 LT |
867 | } |
868 | ||
869 | /** | |
870 | * snd_card_proc_new - create an info entry for the given card | |
871 | * @card: the card instance | |
872 | * @name: the file name | |
873 | * @entryp: the pointer to store the new info entry | |
874 | * | |
875 | * Creates a new info entry and assigns it to the given card. | |
876 | * Unlike snd_info_create_card_entry(), this function registers the | |
877 | * info entry as an ALSA device component, so that it can be | |
878 | * unregistered/released without explicit call. | |
879 | * Also, you don't have to register this entry via snd_info_register(), | |
880 | * since this will be registered by snd_card_register() automatically. | |
881 | * | |
882 | * The parent is assumed as card->proc_root. | |
883 | * | |
884 | * For releasing this entry, use snd_device_free() instead of | |
885 | * snd_info_free_entry(). | |
886 | * | |
887 | * Returns zero if successful, or a negative error code on failure. | |
888 | */ | |
24c1f931 TI |
889 | int snd_card_proc_new(struct snd_card *card, const char *name, |
890 | struct snd_info_entry **entryp) | |
1da177e4 | 891 | { |
24c1f931 | 892 | static struct snd_device_ops ops = { |
1da177e4 LT |
893 | .dev_free = snd_info_dev_free_entry, |
894 | .dev_register = snd_info_dev_register_entry, | |
746d4a02 | 895 | /* disconnect is done via snd_info_card_disconnect() */ |
1da177e4 | 896 | }; |
24c1f931 | 897 | struct snd_info_entry *entry; |
1da177e4 LT |
898 | int err; |
899 | ||
900 | entry = snd_info_create_card_entry(card, name, card->proc_root); | |
901 | if (! entry) | |
902 | return -ENOMEM; | |
903 | if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) { | |
904 | snd_info_free_entry(entry); | |
905 | return err; | |
906 | } | |
907 | if (entryp) | |
908 | *entryp = entry; | |
909 | return 0; | |
910 | } | |
911 | ||
c0d3fb39 TI |
912 | EXPORT_SYMBOL(snd_card_proc_new); |
913 | ||
1da177e4 LT |
914 | /** |
915 | * snd_info_free_entry - release the info entry | |
916 | * @entry: the info entry | |
917 | * | |
918 | * Releases the info entry. Don't call this after registered. | |
919 | */ | |
24c1f931 | 920 | void snd_info_free_entry(struct snd_info_entry * entry) |
1da177e4 LT |
921 | { |
922 | if (entry == NULL) | |
923 | return; | |
746d4a02 TI |
924 | if (entry->p) { |
925 | mutex_lock(&info_mutex); | |
926 | snd_info_disconnect(entry); | |
927 | mutex_unlock(&info_mutex); | |
928 | } | |
1da177e4 LT |
929 | kfree(entry->name); |
930 | if (entry->private_free) | |
931 | entry->private_free(entry); | |
932 | kfree(entry); | |
933 | } | |
934 | ||
c0d3fb39 TI |
935 | EXPORT_SYMBOL(snd_info_free_entry); |
936 | ||
1da177e4 LT |
937 | /** |
938 | * snd_info_register - register the info entry | |
939 | * @entry: the info entry | |
940 | * | |
941 | * Registers the proc info entry. | |
942 | * | |
943 | * Returns zero if successful, or a negative error code on failure. | |
944 | */ | |
24c1f931 | 945 | int snd_info_register(struct snd_info_entry * entry) |
1da177e4 LT |
946 | { |
947 | struct proc_dir_entry *root, *p = NULL; | |
948 | ||
949 | snd_assert(entry != NULL, return -ENXIO); | |
950 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; | |
1a60d4c5 | 951 | mutex_lock(&info_mutex); |
1da177e4 LT |
952 | p = snd_create_proc_entry(entry->name, entry->mode, root); |
953 | if (!p) { | |
1a60d4c5 | 954 | mutex_unlock(&info_mutex); |
1da177e4 LT |
955 | return -ENOMEM; |
956 | } | |
957 | p->owner = entry->module; | |
958 | if (!S_ISDIR(entry->mode)) | |
959 | p->proc_fops = &snd_info_entry_operations; | |
960 | p->size = entry->size; | |
961 | p->data = entry; | |
962 | entry->p = p; | |
746d4a02 TI |
963 | if (entry->parent) |
964 | list_add_tail(&entry->list, &entry->parent->children); | |
1a60d4c5 | 965 | mutex_unlock(&info_mutex); |
1da177e4 LT |
966 | return 0; |
967 | } | |
968 | ||
c0d3fb39 TI |
969 | EXPORT_SYMBOL(snd_info_register); |
970 | ||
1da177e4 LT |
971 | /* |
972 | ||
973 | */ | |
974 | ||
6581f4e7 | 975 | static struct snd_info_entry *snd_info_version_entry; |
1da177e4 | 976 | |
24c1f931 | 977 | static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) |
1da177e4 LT |
978 | { |
979 | snd_iprintf(buffer, | |
980 | "Advanced Linux Sound Architecture Driver Version " | |
981 | CONFIG_SND_VERSION CONFIG_SND_DATE ".\n" | |
982 | ); | |
983 | } | |
984 | ||
985 | static int __init snd_info_version_init(void) | |
986 | { | |
24c1f931 | 987 | struct snd_info_entry *entry; |
1da177e4 LT |
988 | |
989 | entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL); | |
990 | if (entry == NULL) | |
991 | return -ENOMEM; | |
1da177e4 LT |
992 | entry->c.text.read = snd_info_version_read; |
993 | if (snd_info_register(entry) < 0) { | |
994 | snd_info_free_entry(entry); | |
995 | return -ENOMEM; | |
996 | } | |
997 | snd_info_version_entry = entry; | |
998 | return 0; | |
999 | } | |
1000 | ||
1001 | static int __exit snd_info_version_done(void) | |
1002 | { | |
746d4a02 | 1003 | snd_info_free_entry(snd_info_version_entry); |
1da177e4 LT |
1004 | return 0; |
1005 | } | |
1006 | ||
1007 | #endif /* CONFIG_PROC_FS */ |