Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Information interface for ALSA driver | |
c1017a4c | 3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
4 | * |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | */ | |
21 | ||
1da177e4 | 22 | #include <linux/init.h> |
1da177e4 | 23 | #include <linux/time.h> |
27ac792c | 24 | #include <linux/mm.h> |
1da177e4 | 25 | #include <linux/smp_lock.h> |
543537bd | 26 | #include <linux/string.h> |
1da177e4 LT |
27 | #include <sound/core.h> |
28 | #include <sound/minors.h> | |
29 | #include <sound/info.h> | |
30 | #include <sound/version.h> | |
31 | #include <linux/proc_fs.h> | |
1a60d4c5 | 32 | #include <linux/mutex.h> |
1da177e4 LT |
33 | #include <stdarg.h> |
34 | ||
35 | /* | |
36 | * | |
37 | */ | |
38 | ||
e28563cc TI |
39 | #ifdef CONFIG_PROC_FS |
40 | ||
1da177e4 LT |
41 | int snd_info_check_reserved_words(const char *str) |
42 | { | |
43 | static char *reserved[] = | |
44 | { | |
45 | "version", | |
46 | "meminfo", | |
47 | "memdebug", | |
48 | "detect", | |
49 | "devices", | |
50 | "oss", | |
51 | "cards", | |
52 | "timers", | |
53 | "synth", | |
54 | "pcm", | |
55 | "seq", | |
56 | NULL | |
57 | }; | |
58 | char **xstr = reserved; | |
59 | ||
60 | while (*xstr) { | |
61 | if (!strcmp(*xstr, str)) | |
62 | return 0; | |
63 | xstr++; | |
64 | } | |
65 | if (!strncmp(str, "card", 4)) | |
66 | return 0; | |
67 | return 1; | |
68 | } | |
69 | ||
1a60d4c5 | 70 | static DEFINE_MUTEX(info_mutex); |
1da177e4 | 71 | |
24c1f931 TI |
72 | struct snd_info_private_data { |
73 | struct snd_info_buffer *rbuffer; | |
74 | struct snd_info_buffer *wbuffer; | |
75 | struct snd_info_entry *entry; | |
1da177e4 | 76 | void *file_private_data; |
24c1f931 | 77 | }; |
1da177e4 LT |
78 | |
79 | static int snd_info_version_init(void); | |
80 | static int snd_info_version_done(void); | |
746d4a02 | 81 | static void snd_info_disconnect(struct snd_info_entry *entry); |
1da177e4 LT |
82 | |
83 | ||
7e4eeec8 TI |
84 | /* resize the proc r/w buffer */ |
85 | static int resize_info_buffer(struct snd_info_buffer *buffer, | |
86 | unsigned int nsize) | |
87 | { | |
88 | char *nbuf; | |
89 | ||
90 | nsize = PAGE_ALIGN(nsize); | |
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; | |
7eaa943c TI |
220 | if (snd_BUG_ON(!data)) |
221 | return -ENXIO; | |
1da177e4 LT |
222 | pos = *offset; |
223 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
224 | return -EIO; | |
225 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
226 | return -EIO; | |
227 | entry = data->entry; | |
228 | switch (entry->content) { | |
229 | case SNDRV_INFO_CONTENT_TEXT: | |
230 | buf = data->rbuffer; | |
231 | if (buf == NULL) | |
232 | return -EIO; | |
233 | if (pos >= buf->size) | |
234 | return 0; | |
235 | size = buf->size - pos; | |
236 | size = min(count, size); | |
237 | if (copy_to_user(buffer, buf->buffer + pos, size)) | |
238 | return -EFAULT; | |
239 | break; | |
240 | case SNDRV_INFO_CONTENT_DATA: | |
241 | if (entry->c.ops->read) | |
242 | size = entry->c.ops->read(entry, | |
243 | data->file_private_data, | |
244 | file, buffer, count, pos); | |
245 | break; | |
246 | } | |
247 | if ((ssize_t) size > 0) | |
248 | *offset = pos + size; | |
249 | return size; | |
250 | } | |
251 | ||
252 | static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer, | |
253 | size_t count, loff_t * offset) | |
254 | { | |
24c1f931 | 255 | struct snd_info_private_data *data; |
1da177e4 | 256 | struct snd_info_entry *entry; |
24c1f931 | 257 | struct snd_info_buffer *buf; |
7e4eeec8 | 258 | ssize_t size = 0; |
1da177e4 LT |
259 | loff_t pos; |
260 | ||
261 | data = file->private_data; | |
7eaa943c TI |
262 | if (snd_BUG_ON(!data)) |
263 | return -ENXIO; | |
1da177e4 LT |
264 | entry = data->entry; |
265 | pos = *offset; | |
266 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
267 | return -EIO; | |
268 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
269 | return -EIO; | |
270 | switch (entry->content) { | |
271 | case SNDRV_INFO_CONTENT_TEXT: | |
272 | buf = data->wbuffer; | |
273 | if (buf == NULL) | |
274 | return -EIO; | |
f4a747f1 | 275 | mutex_lock(&entry->access); |
7e4eeec8 TI |
276 | if (pos + count >= buf->len) { |
277 | if (resize_info_buffer(buf, pos + count)) { | |
278 | mutex_unlock(&entry->access); | |
279 | return -ENOMEM; | |
280 | } | |
281 | } | |
282 | if (copy_from_user(buf->buffer + pos, buffer, count)) { | |
283 | mutex_unlock(&entry->access); | |
1da177e4 | 284 | return -EFAULT; |
7e4eeec8 TI |
285 | } |
286 | buf->size = pos + count; | |
287 | mutex_unlock(&entry->access); | |
288 | size = count; | |
1da177e4 LT |
289 | break; |
290 | case SNDRV_INFO_CONTENT_DATA: | |
291 | if (entry->c.ops->write) | |
292 | size = entry->c.ops->write(entry, | |
293 | data->file_private_data, | |
294 | file, buffer, count, pos); | |
295 | break; | |
296 | } | |
297 | if ((ssize_t) size > 0) | |
298 | *offset = pos + size; | |
299 | return size; | |
300 | } | |
301 | ||
302 | static int snd_info_entry_open(struct inode *inode, struct file *file) | |
303 | { | |
24c1f931 TI |
304 | struct snd_info_entry *entry; |
305 | struct snd_info_private_data *data; | |
306 | struct snd_info_buffer *buffer; | |
1da177e4 LT |
307 | struct proc_dir_entry *p; |
308 | int mode, err; | |
309 | ||
1a60d4c5 | 310 | mutex_lock(&info_mutex); |
1da177e4 | 311 | p = PDE(inode); |
24c1f931 | 312 | entry = p == NULL ? NULL : (struct snd_info_entry *)p->data; |
746d4a02 | 313 | if (entry == NULL || ! entry->p) { |
1a60d4c5 | 314 | mutex_unlock(&info_mutex); |
1da177e4 LT |
315 | return -ENODEV; |
316 | } | |
317 | if (!try_module_get(entry->module)) { | |
318 | err = -EFAULT; | |
319 | goto __error1; | |
320 | } | |
321 | mode = file->f_flags & O_ACCMODE; | |
322 | if (mode == O_RDONLY || mode == O_RDWR) { | |
7e4eeec8 | 323 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
1da177e4 LT |
324 | entry->c.ops->read == NULL)) { |
325 | err = -ENODEV; | |
326 | goto __error; | |
327 | } | |
328 | } | |
329 | if (mode == O_WRONLY || mode == O_RDWR) { | |
7e4eeec8 | 330 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
1da177e4 LT |
331 | entry->c.ops->write == NULL)) { |
332 | err = -ENODEV; | |
333 | goto __error; | |
334 | } | |
335 | } | |
ca2c0966 | 336 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
337 | if (data == NULL) { |
338 | err = -ENOMEM; | |
339 | goto __error; | |
340 | } | |
341 | data->entry = entry; | |
342 | switch (entry->content) { | |
343 | case SNDRV_INFO_CONTENT_TEXT: | |
344 | if (mode == O_RDONLY || mode == O_RDWR) { | |
ca2c0966 | 345 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
7e4eeec8 TI |
346 | if (buffer == NULL) |
347 | goto __nomem; | |
1da177e4 | 348 | data->rbuffer = buffer; |
7e4eeec8 TI |
349 | buffer->len = PAGE_SIZE; |
350 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); | |
351 | if (buffer->buffer == NULL) | |
352 | goto __nomem; | |
1da177e4 LT |
353 | } |
354 | if (mode == O_WRONLY || mode == O_RDWR) { | |
ca2c0966 | 355 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
7e4eeec8 TI |
356 | if (buffer == NULL) |
357 | goto __nomem; | |
1da177e4 | 358 | data->wbuffer = buffer; |
7e4eeec8 TI |
359 | buffer->len = PAGE_SIZE; |
360 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); | |
361 | if (buffer->buffer == NULL) | |
362 | goto __nomem; | |
1da177e4 LT |
363 | } |
364 | break; | |
365 | case SNDRV_INFO_CONTENT_DATA: /* data */ | |
366 | if (entry->c.ops->open) { | |
367 | if ((err = entry->c.ops->open(entry, mode, | |
368 | &data->file_private_data)) < 0) { | |
369 | kfree(data); | |
370 | goto __error; | |
371 | } | |
372 | } | |
373 | break; | |
374 | } | |
375 | file->private_data = data; | |
1a60d4c5 | 376 | mutex_unlock(&info_mutex); |
1da177e4 LT |
377 | if (entry->content == SNDRV_INFO_CONTENT_TEXT && |
378 | (mode == O_RDONLY || mode == O_RDWR)) { | |
379 | if (entry->c.text.read) { | |
1a60d4c5 | 380 | mutex_lock(&entry->access); |
1da177e4 | 381 | entry->c.text.read(entry, data->rbuffer); |
1a60d4c5 | 382 | mutex_unlock(&entry->access); |
1da177e4 LT |
383 | } |
384 | } | |
385 | return 0; | |
386 | ||
7e4eeec8 TI |
387 | __nomem: |
388 | if (data->rbuffer) { | |
389 | kfree(data->rbuffer->buffer); | |
390 | kfree(data->rbuffer); | |
391 | } | |
392 | if (data->wbuffer) { | |
393 | kfree(data->wbuffer->buffer); | |
394 | kfree(data->wbuffer); | |
395 | } | |
396 | kfree(data); | |
397 | err = -ENOMEM; | |
1da177e4 LT |
398 | __error: |
399 | module_put(entry->module); | |
400 | __error1: | |
1a60d4c5 | 401 | mutex_unlock(&info_mutex); |
1da177e4 LT |
402 | return err; |
403 | } | |
404 | ||
405 | static int snd_info_entry_release(struct inode *inode, struct file *file) | |
406 | { | |
24c1f931 TI |
407 | struct snd_info_entry *entry; |
408 | struct snd_info_private_data *data; | |
1da177e4 LT |
409 | int mode; |
410 | ||
411 | mode = file->f_flags & O_ACCMODE; | |
412 | data = file->private_data; | |
413 | entry = data->entry; | |
414 | switch (entry->content) { | |
415 | case SNDRV_INFO_CONTENT_TEXT: | |
7e4eeec8 TI |
416 | if (data->rbuffer) { |
417 | kfree(data->rbuffer->buffer); | |
1da177e4 LT |
418 | kfree(data->rbuffer); |
419 | } | |
7e4eeec8 | 420 | if (data->wbuffer) { |
1da177e4 LT |
421 | if (entry->c.text.write) { |
422 | entry->c.text.write(entry, data->wbuffer); | |
423 | if (data->wbuffer->error) { | |
424 | snd_printk(KERN_WARNING "data write error to %s (%i)\n", | |
425 | entry->name, | |
426 | data->wbuffer->error); | |
427 | } | |
428 | } | |
7e4eeec8 | 429 | kfree(data->wbuffer->buffer); |
1da177e4 LT |
430 | kfree(data->wbuffer); |
431 | } | |
432 | break; | |
433 | case SNDRV_INFO_CONTENT_DATA: | |
434 | if (entry->c.ops->release) | |
435 | entry->c.ops->release(entry, mode, | |
436 | data->file_private_data); | |
437 | break; | |
438 | } | |
439 | module_put(entry->module); | |
440 | kfree(data); | |
441 | return 0; | |
442 | } | |
443 | ||
444 | static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait) | |
445 | { | |
24c1f931 | 446 | struct snd_info_private_data *data; |
1da177e4 LT |
447 | struct snd_info_entry *entry; |
448 | unsigned int mask; | |
449 | ||
450 | data = file->private_data; | |
451 | if (data == NULL) | |
452 | return 0; | |
453 | entry = data->entry; | |
454 | mask = 0; | |
455 | switch (entry->content) { | |
456 | case SNDRV_INFO_CONTENT_DATA: | |
457 | if (entry->c.ops->poll) | |
458 | return entry->c.ops->poll(entry, | |
459 | data->file_private_data, | |
460 | file, wait); | |
461 | if (entry->c.ops->read) | |
462 | mask |= POLLIN | POLLRDNORM; | |
463 | if (entry->c.ops->write) | |
464 | mask |= POLLOUT | POLLWRNORM; | |
465 | break; | |
466 | } | |
467 | return mask; | |
468 | } | |
469 | ||
d99e9889 IM |
470 | static long snd_info_entry_ioctl(struct file *file, unsigned int cmd, |
471 | unsigned long arg) | |
1da177e4 | 472 | { |
24c1f931 | 473 | struct snd_info_private_data *data; |
1da177e4 LT |
474 | struct snd_info_entry *entry; |
475 | ||
476 | data = file->private_data; | |
477 | if (data == NULL) | |
478 | return 0; | |
479 | entry = data->entry; | |
480 | switch (entry->content) { | |
481 | case SNDRV_INFO_CONTENT_DATA: | |
482 | if (entry->c.ops->ioctl) | |
483 | return entry->c.ops->ioctl(entry, | |
484 | data->file_private_data, | |
485 | file, cmd, arg); | |
486 | break; | |
487 | } | |
488 | return -ENOTTY; | |
489 | } | |
490 | ||
1da177e4 LT |
491 | static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma) |
492 | { | |
7bc56323 | 493 | struct inode *inode = file->f_path.dentry->d_inode; |
24c1f931 | 494 | struct snd_info_private_data *data; |
1da177e4 LT |
495 | struct snd_info_entry *entry; |
496 | ||
497 | data = file->private_data; | |
498 | if (data == NULL) | |
499 | return 0; | |
500 | entry = data->entry; | |
501 | switch (entry->content) { | |
502 | case SNDRV_INFO_CONTENT_DATA: | |
503 | if (entry->c.ops->mmap) | |
504 | return entry->c.ops->mmap(entry, | |
505 | data->file_private_data, | |
506 | inode, file, vma); | |
507 | break; | |
508 | } | |
509 | return -ENXIO; | |
510 | } | |
511 | ||
9c2e08c5 | 512 | static const struct file_operations snd_info_entry_operations = |
1da177e4 | 513 | { |
d99e9889 IM |
514 | .owner = THIS_MODULE, |
515 | .llseek = snd_info_entry_llseek, | |
516 | .read = snd_info_entry_read, | |
517 | .write = snd_info_entry_write, | |
518 | .poll = snd_info_entry_poll, | |
519 | .unlocked_ioctl = snd_info_entry_ioctl, | |
520 | .mmap = snd_info_entry_mmap, | |
521 | .open = snd_info_entry_open, | |
522 | .release = snd_info_entry_release, | |
1da177e4 LT |
523 | }; |
524 | ||
525 | /** | |
526 | * snd_create_proc_entry - create a procfs entry | |
527 | * @name: the name of the proc file | |
528 | * @mode: the file permission bits, S_Ixxx | |
529 | * @parent: the parent proc-directory entry | |
530 | * | |
531 | * Creates a new proc file entry with the given name and permission | |
532 | * on the given directory. | |
533 | * | |
534 | * Returns the pointer of new instance or NULL on failure. | |
535 | */ | |
536 | static struct proc_dir_entry *snd_create_proc_entry(const char *name, mode_t mode, | |
537 | struct proc_dir_entry *parent) | |
538 | { | |
539 | struct proc_dir_entry *p; | |
540 | p = create_proc_entry(name, mode, parent); | |
541 | if (p) | |
542 | snd_info_entry_prepare(p); | |
543 | return p; | |
544 | } | |
545 | ||
546 | int __init snd_info_init(void) | |
547 | { | |
548 | struct proc_dir_entry *p; | |
549 | ||
c74c120a | 550 | p = snd_create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, NULL); |
1da177e4 LT |
551 | if (p == NULL) |
552 | return -ENOMEM; | |
553 | snd_proc_root = p; | |
554 | #ifdef CONFIG_SND_OSSEMUL | |
555 | { | |
24c1f931 | 556 | struct snd_info_entry *entry; |
1da177e4 LT |
557 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL) |
558 | return -ENOMEM; | |
559 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
560 | if (snd_info_register(entry) < 0) { | |
561 | snd_info_free_entry(entry); | |
562 | return -ENOMEM; | |
563 | } | |
564 | snd_oss_root = entry; | |
565 | } | |
566 | #endif | |
567 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
568 | { | |
24c1f931 | 569 | struct snd_info_entry *entry; |
1da177e4 LT |
570 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL) |
571 | return -ENOMEM; | |
572 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
573 | if (snd_info_register(entry) < 0) { | |
574 | snd_info_free_entry(entry); | |
575 | return -ENOMEM; | |
576 | } | |
577 | snd_seq_root = entry; | |
578 | } | |
579 | #endif | |
580 | snd_info_version_init(); | |
1da177e4 LT |
581 | snd_minor_info_init(); |
582 | snd_minor_info_oss_init(); | |
583 | snd_card_info_init(); | |
584 | return 0; | |
585 | } | |
586 | ||
587 | int __exit snd_info_done(void) | |
588 | { | |
589 | snd_card_info_done(); | |
590 | snd_minor_info_oss_done(); | |
591 | snd_minor_info_done(); | |
1da177e4 LT |
592 | snd_info_version_done(); |
593 | if (snd_proc_root) { | |
594 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
746d4a02 | 595 | snd_info_free_entry(snd_seq_root); |
1da177e4 LT |
596 | #endif |
597 | #ifdef CONFIG_SND_OSSEMUL | |
746d4a02 | 598 | snd_info_free_entry(snd_oss_root); |
1da177e4 | 599 | #endif |
c74c120a | 600 | snd_remove_proc_entry(NULL, snd_proc_root); |
1da177e4 LT |
601 | } |
602 | return 0; | |
603 | } | |
604 | ||
605 | /* | |
606 | ||
607 | */ | |
608 | ||
609 | ||
610 | /* | |
611 | * create a card proc file | |
612 | * called from init.c | |
613 | */ | |
24c1f931 | 614 | int snd_info_card_create(struct snd_card *card) |
1da177e4 LT |
615 | { |
616 | char str[8]; | |
24c1f931 | 617 | struct snd_info_entry *entry; |
1da177e4 | 618 | |
7eaa943c TI |
619 | if (snd_BUG_ON(!card)) |
620 | return -ENXIO; | |
1da177e4 LT |
621 | |
622 | sprintf(str, "card%i", card->number); | |
623 | if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL) | |
624 | return -ENOMEM; | |
625 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
626 | if (snd_info_register(entry) < 0) { | |
627 | snd_info_free_entry(entry); | |
628 | return -ENOMEM; | |
629 | } | |
630 | card->proc_root = entry; | |
631 | return 0; | |
632 | } | |
633 | ||
634 | /* | |
635 | * register the card proc file | |
636 | * called from init.c | |
637 | */ | |
24c1f931 | 638 | int snd_info_card_register(struct snd_card *card) |
1da177e4 LT |
639 | { |
640 | struct proc_dir_entry *p; | |
641 | ||
7eaa943c TI |
642 | if (snd_BUG_ON(!card)) |
643 | return -ENXIO; | |
1da177e4 LT |
644 | |
645 | if (!strcmp(card->id, card->proc_root->name)) | |
646 | return 0; | |
647 | ||
648 | p = proc_symlink(card->id, snd_proc_root, card->proc_root->name); | |
649 | if (p == NULL) | |
650 | return -ENOMEM; | |
651 | card->proc_root_link = p; | |
652 | return 0; | |
653 | } | |
654 | ||
c2eb9c4e JK |
655 | /* |
656 | * called on card->id change | |
657 | */ | |
658 | void snd_info_card_id_change(struct snd_card *card) | |
659 | { | |
660 | mutex_lock(&info_mutex); | |
661 | if (card->proc_root_link) { | |
662 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); | |
663 | card->proc_root_link = NULL; | |
664 | } | |
665 | if (strcmp(card->id, card->proc_root->name)) | |
666 | card->proc_root_link = proc_symlink(card->id, | |
667 | snd_proc_root, | |
668 | card->proc_root->name); | |
669 | mutex_unlock(&info_mutex); | |
670 | } | |
671 | ||
1da177e4 LT |
672 | /* |
673 | * de-register the card proc file | |
674 | * called from init.c | |
675 | */ | |
746d4a02 | 676 | void snd_info_card_disconnect(struct snd_card *card) |
1da177e4 | 677 | { |
7eaa943c TI |
678 | if (!card) |
679 | return; | |
746d4a02 | 680 | mutex_lock(&info_mutex); |
1da177e4 LT |
681 | if (card->proc_root_link) { |
682 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); | |
683 | card->proc_root_link = NULL; | |
684 | } | |
746d4a02 TI |
685 | if (card->proc_root) |
686 | snd_info_disconnect(card->proc_root); | |
687 | mutex_unlock(&info_mutex); | |
688 | } | |
689 | ||
690 | /* | |
691 | * release the card proc file resources | |
692 | * called from init.c | |
693 | */ | |
694 | int snd_info_card_free(struct snd_card *card) | |
695 | { | |
7eaa943c TI |
696 | if (!card) |
697 | return 0; | |
746d4a02 TI |
698 | snd_info_free_entry(card->proc_root); |
699 | card->proc_root = NULL; | |
1da177e4 LT |
700 | return 0; |
701 | } | |
702 | ||
703 | ||
704 | /** | |
705 | * snd_info_get_line - read one line from the procfs buffer | |
706 | * @buffer: the procfs buffer | |
707 | * @line: the buffer to store | |
708 | * @len: the max. buffer size - 1 | |
709 | * | |
710 | * Reads one line from the buffer and stores the string. | |
711 | * | |
712 | * Returns zero if successful, or 1 if error or EOF. | |
713 | */ | |
24c1f931 | 714 | int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) |
1da177e4 LT |
715 | { |
716 | int c = -1; | |
717 | ||
718 | if (len <= 0 || buffer->stop || buffer->error) | |
719 | return 1; | |
720 | while (--len > 0) { | |
7e4eeec8 | 721 | c = buffer->buffer[buffer->curr++]; |
1da177e4 | 722 | if (c == '\n') { |
7e4eeec8 | 723 | if (buffer->curr >= buffer->size) |
1da177e4 | 724 | buffer->stop = 1; |
1da177e4 LT |
725 | break; |
726 | } | |
727 | *line++ = c; | |
7e4eeec8 | 728 | if (buffer->curr >= buffer->size) { |
1da177e4 LT |
729 | buffer->stop = 1; |
730 | break; | |
731 | } | |
732 | } | |
733 | while (c != '\n' && !buffer->stop) { | |
7e4eeec8 TI |
734 | c = buffer->buffer[buffer->curr++]; |
735 | if (buffer->curr >= buffer->size) | |
1da177e4 | 736 | buffer->stop = 1; |
1da177e4 LT |
737 | } |
738 | *line = '\0'; | |
739 | return 0; | |
740 | } | |
741 | ||
c0d3fb39 TI |
742 | EXPORT_SYMBOL(snd_info_get_line); |
743 | ||
1da177e4 | 744 | /** |
856def8a | 745 | * snd_info_get_str - parse a string token |
1da177e4 LT |
746 | * @dest: the buffer to store the string token |
747 | * @src: the original string | |
748 | * @len: the max. length of token - 1 | |
749 | * | |
750 | * Parses the original string and copy a token to the given | |
751 | * string buffer. | |
752 | * | |
753 | * Returns the updated pointer of the original string so that | |
754 | * it can be used for the next call. | |
755 | */ | |
756 | char *snd_info_get_str(char *dest, char *src, int len) | |
757 | { | |
758 | int c; | |
759 | ||
760 | while (*src == ' ' || *src == '\t') | |
761 | src++; | |
762 | if (*src == '"' || *src == '\'') { | |
763 | c = *src++; | |
764 | while (--len > 0 && *src && *src != c) { | |
765 | *dest++ = *src++; | |
766 | } | |
767 | if (*src == c) | |
768 | src++; | |
769 | } else { | |
770 | while (--len > 0 && *src && *src != ' ' && *src != '\t') { | |
771 | *dest++ = *src++; | |
772 | } | |
773 | } | |
774 | *dest = 0; | |
775 | while (*src == ' ' || *src == '\t') | |
776 | src++; | |
777 | return src; | |
778 | } | |
779 | ||
c0d3fb39 TI |
780 | EXPORT_SYMBOL(snd_info_get_str); |
781 | ||
1da177e4 LT |
782 | /** |
783 | * snd_info_create_entry - create an info entry | |
784 | * @name: the proc file name | |
785 | * | |
786 | * Creates an info entry with the given file name and initializes as | |
787 | * the default state. | |
788 | * | |
789 | * Usually called from other functions such as | |
790 | * snd_info_create_card_entry(). | |
791 | * | |
792 | * Returns the pointer of the new instance, or NULL on failure. | |
793 | */ | |
24c1f931 | 794 | static struct snd_info_entry *snd_info_create_entry(const char *name) |
1da177e4 | 795 | { |
24c1f931 | 796 | struct snd_info_entry *entry; |
ca2c0966 | 797 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
1da177e4 LT |
798 | if (entry == NULL) |
799 | return NULL; | |
543537bd | 800 | entry->name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
801 | if (entry->name == NULL) { |
802 | kfree(entry); | |
803 | return NULL; | |
804 | } | |
805 | entry->mode = S_IFREG | S_IRUGO; | |
806 | entry->content = SNDRV_INFO_CONTENT_TEXT; | |
1a60d4c5 | 807 | mutex_init(&entry->access); |
746d4a02 TI |
808 | INIT_LIST_HEAD(&entry->children); |
809 | INIT_LIST_HEAD(&entry->list); | |
1da177e4 LT |
810 | return entry; |
811 | } | |
812 | ||
813 | /** | |
814 | * snd_info_create_module_entry - create an info entry for the given module | |
815 | * @module: the module pointer | |
816 | * @name: the file name | |
817 | * @parent: the parent directory | |
818 | * | |
819 | * Creates a new info entry and assigns it to the given module. | |
820 | * | |
821 | * Returns the pointer of the new instance, or NULL on failure. | |
822 | */ | |
24c1f931 | 823 | struct snd_info_entry *snd_info_create_module_entry(struct module * module, |
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 = module; | |
830 | entry->parent = parent; | |
831 | } | |
832 | return entry; | |
833 | } | |
834 | ||
c0d3fb39 TI |
835 | EXPORT_SYMBOL(snd_info_create_module_entry); |
836 | ||
1da177e4 LT |
837 | /** |
838 | * snd_info_create_card_entry - create an info entry for the given card | |
839 | * @card: the card instance | |
840 | * @name: the file name | |
841 | * @parent: the parent directory | |
842 | * | |
843 | * Creates a new info entry and assigns it to the given card. | |
844 | * | |
845 | * Returns the pointer of the new instance, or NULL on failure. | |
846 | */ | |
24c1f931 | 847 | struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, |
1da177e4 | 848 | const char *name, |
24c1f931 | 849 | struct snd_info_entry * parent) |
1da177e4 | 850 | { |
24c1f931 | 851 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
852 | if (entry) { |
853 | entry->module = card->module; | |
854 | entry->card = card; | |
855 | entry->parent = parent; | |
856 | } | |
857 | return entry; | |
858 | } | |
859 | ||
c0d3fb39 TI |
860 | EXPORT_SYMBOL(snd_info_create_card_entry); |
861 | ||
746d4a02 | 862 | static void snd_info_disconnect(struct snd_info_entry *entry) |
1da177e4 | 863 | { |
746d4a02 TI |
864 | struct list_head *p, *n; |
865 | struct proc_dir_entry *root; | |
1da177e4 | 866 | |
746d4a02 TI |
867 | list_for_each_safe(p, n, &entry->children) { |
868 | snd_info_disconnect(list_entry(p, struct snd_info_entry, list)); | |
869 | } | |
870 | ||
871 | if (! entry->p) | |
872 | return; | |
873 | list_del_init(&entry->list); | |
874 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; | |
7eaa943c | 875 | snd_BUG_ON(!root); |
746d4a02 TI |
876 | snd_remove_proc_entry(root, entry->p); |
877 | entry->p = NULL; | |
1da177e4 LT |
878 | } |
879 | ||
746d4a02 | 880 | static int snd_info_dev_free_entry(struct snd_device *device) |
1da177e4 | 881 | { |
24c1f931 | 882 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 883 | snd_info_free_entry(entry); |
1da177e4 LT |
884 | return 0; |
885 | } | |
886 | ||
746d4a02 | 887 | static int snd_info_dev_register_entry(struct snd_device *device) |
1da177e4 | 888 | { |
24c1f931 | 889 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 890 | return snd_info_register(entry); |
1da177e4 LT |
891 | } |
892 | ||
893 | /** | |
894 | * snd_card_proc_new - create an info entry for the given card | |
895 | * @card: the card instance | |
896 | * @name: the file name | |
897 | * @entryp: the pointer to store the new info entry | |
898 | * | |
899 | * Creates a new info entry and assigns it to the given card. | |
900 | * Unlike snd_info_create_card_entry(), this function registers the | |
901 | * info entry as an ALSA device component, so that it can be | |
902 | * unregistered/released without explicit call. | |
903 | * Also, you don't have to register this entry via snd_info_register(), | |
904 | * since this will be registered by snd_card_register() automatically. | |
905 | * | |
906 | * The parent is assumed as card->proc_root. | |
907 | * | |
908 | * For releasing this entry, use snd_device_free() instead of | |
909 | * snd_info_free_entry(). | |
910 | * | |
911 | * Returns zero if successful, or a negative error code on failure. | |
912 | */ | |
24c1f931 TI |
913 | int snd_card_proc_new(struct snd_card *card, const char *name, |
914 | struct snd_info_entry **entryp) | |
1da177e4 | 915 | { |
24c1f931 | 916 | static struct snd_device_ops ops = { |
1da177e4 LT |
917 | .dev_free = snd_info_dev_free_entry, |
918 | .dev_register = snd_info_dev_register_entry, | |
746d4a02 | 919 | /* disconnect is done via snd_info_card_disconnect() */ |
1da177e4 | 920 | }; |
24c1f931 | 921 | struct snd_info_entry *entry; |
1da177e4 LT |
922 | int err; |
923 | ||
924 | entry = snd_info_create_card_entry(card, name, card->proc_root); | |
925 | if (! entry) | |
926 | return -ENOMEM; | |
927 | if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) { | |
928 | snd_info_free_entry(entry); | |
929 | return err; | |
930 | } | |
931 | if (entryp) | |
932 | *entryp = entry; | |
933 | return 0; | |
934 | } | |
935 | ||
c0d3fb39 TI |
936 | EXPORT_SYMBOL(snd_card_proc_new); |
937 | ||
1da177e4 LT |
938 | /** |
939 | * snd_info_free_entry - release the info entry | |
940 | * @entry: the info entry | |
941 | * | |
942 | * Releases the info entry. Don't call this after registered. | |
943 | */ | |
24c1f931 | 944 | void snd_info_free_entry(struct snd_info_entry * entry) |
1da177e4 LT |
945 | { |
946 | if (entry == NULL) | |
947 | return; | |
746d4a02 TI |
948 | if (entry->p) { |
949 | mutex_lock(&info_mutex); | |
950 | snd_info_disconnect(entry); | |
951 | mutex_unlock(&info_mutex); | |
952 | } | |
1da177e4 LT |
953 | kfree(entry->name); |
954 | if (entry->private_free) | |
955 | entry->private_free(entry); | |
956 | kfree(entry); | |
957 | } | |
958 | ||
c0d3fb39 TI |
959 | EXPORT_SYMBOL(snd_info_free_entry); |
960 | ||
1da177e4 LT |
961 | /** |
962 | * snd_info_register - register the info entry | |
963 | * @entry: the info entry | |
964 | * | |
965 | * Registers the proc info entry. | |
966 | * | |
967 | * Returns zero if successful, or a negative error code on failure. | |
968 | */ | |
24c1f931 | 969 | int snd_info_register(struct snd_info_entry * entry) |
1da177e4 LT |
970 | { |
971 | struct proc_dir_entry *root, *p = NULL; | |
972 | ||
7eaa943c TI |
973 | if (snd_BUG_ON(!entry)) |
974 | return -ENXIO; | |
1da177e4 | 975 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; |
1a60d4c5 | 976 | mutex_lock(&info_mutex); |
1da177e4 LT |
977 | p = snd_create_proc_entry(entry->name, entry->mode, root); |
978 | if (!p) { | |
1a60d4c5 | 979 | mutex_unlock(&info_mutex); |
1da177e4 LT |
980 | return -ENOMEM; |
981 | } | |
982 | p->owner = entry->module; | |
983 | if (!S_ISDIR(entry->mode)) | |
984 | p->proc_fops = &snd_info_entry_operations; | |
985 | p->size = entry->size; | |
986 | p->data = entry; | |
987 | entry->p = p; | |
746d4a02 TI |
988 | if (entry->parent) |
989 | list_add_tail(&entry->list, &entry->parent->children); | |
1a60d4c5 | 990 | mutex_unlock(&info_mutex); |
1da177e4 LT |
991 | return 0; |
992 | } | |
993 | ||
c0d3fb39 TI |
994 | EXPORT_SYMBOL(snd_info_register); |
995 | ||
1da177e4 LT |
996 | /* |
997 | ||
998 | */ | |
999 | ||
6581f4e7 | 1000 | static struct snd_info_entry *snd_info_version_entry; |
1da177e4 | 1001 | |
24c1f931 | 1002 | static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) |
1da177e4 LT |
1003 | { |
1004 | snd_iprintf(buffer, | |
1005 | "Advanced Linux Sound Architecture Driver Version " | |
1006 | CONFIG_SND_VERSION CONFIG_SND_DATE ".\n" | |
1007 | ); | |
1008 | } | |
1009 | ||
1010 | static int __init snd_info_version_init(void) | |
1011 | { | |
24c1f931 | 1012 | struct snd_info_entry *entry; |
1da177e4 LT |
1013 | |
1014 | entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL); | |
1015 | if (entry == NULL) | |
1016 | return -ENOMEM; | |
1da177e4 LT |
1017 | entry->c.text.read = snd_info_version_read; |
1018 | if (snd_info_register(entry) < 0) { | |
1019 | snd_info_free_entry(entry); | |
1020 | return -ENOMEM; | |
1021 | } | |
1022 | snd_info_version_entry = entry; | |
1023 | return 0; | |
1024 | } | |
1025 | ||
1026 | static int __exit snd_info_version_done(void) | |
1027 | { | |
746d4a02 | 1028 | snd_info_free_entry(snd_info_version_entry); |
1da177e4 LT |
1029 | return 0; |
1030 | } | |
1031 | ||
1032 | #endif /* CONFIG_PROC_FS */ |