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> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
1da177e4 | 26 | #include <linux/smp_lock.h> |
543537bd | 27 | #include <linux/string.h> |
1da177e4 LT |
28 | #include <sound/core.h> |
29 | #include <sound/minors.h> | |
30 | #include <sound/info.h> | |
31 | #include <sound/version.h> | |
32 | #include <linux/proc_fs.h> | |
1a60d4c5 | 33 | #include <linux/mutex.h> |
1da177e4 LT |
34 | #include <stdarg.h> |
35 | ||
36 | /* | |
37 | * | |
38 | */ | |
39 | ||
e28563cc TI |
40 | #ifdef CONFIG_PROC_FS |
41 | ||
1da177e4 LT |
42 | int snd_info_check_reserved_words(const char *str) |
43 | { | |
44 | static char *reserved[] = | |
45 | { | |
46 | "version", | |
47 | "meminfo", | |
48 | "memdebug", | |
49 | "detect", | |
50 | "devices", | |
51 | "oss", | |
52 | "cards", | |
53 | "timers", | |
54 | "synth", | |
55 | "pcm", | |
56 | "seq", | |
57 | NULL | |
58 | }; | |
59 | char **xstr = reserved; | |
60 | ||
61 | while (*xstr) { | |
62 | if (!strcmp(*xstr, str)) | |
63 | return 0; | |
64 | xstr++; | |
65 | } | |
66 | if (!strncmp(str, "card", 4)) | |
67 | return 0; | |
68 | return 1; | |
69 | } | |
70 | ||
1a60d4c5 | 71 | static DEFINE_MUTEX(info_mutex); |
1da177e4 | 72 | |
24c1f931 TI |
73 | struct snd_info_private_data { |
74 | struct snd_info_buffer *rbuffer; | |
75 | struct snd_info_buffer *wbuffer; | |
76 | struct snd_info_entry *entry; | |
1da177e4 | 77 | void *file_private_data; |
24c1f931 | 78 | }; |
1da177e4 LT |
79 | |
80 | static int snd_info_version_init(void); | |
81 | static int snd_info_version_done(void); | |
746d4a02 | 82 | static void snd_info_disconnect(struct snd_info_entry *entry); |
1da177e4 LT |
83 | |
84 | ||
7e4eeec8 TI |
85 | /* resize the proc r/w buffer */ |
86 | static int resize_info_buffer(struct snd_info_buffer *buffer, | |
87 | unsigned int nsize) | |
88 | { | |
89 | char *nbuf; | |
90 | ||
91 | nsize = PAGE_ALIGN(nsize); | |
9983aa62 | 92 | nbuf = krealloc(buffer->buffer, nsize, GFP_KERNEL); |
7e4eeec8 TI |
93 | if (! nbuf) |
94 | return -ENOMEM; | |
95 | ||
7e4eeec8 TI |
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 | */ | |
4f7454a9 | 110 | int snd_iprintf(struct snd_info_buffer *buffer, const 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 | ||
1da177e4 LT |
156 | static void snd_remove_proc_entry(struct proc_dir_entry *parent, |
157 | struct proc_dir_entry *de) | |
158 | { | |
159 | if (de) | |
160 | remove_proc_entry(de->name, parent); | |
161 | } | |
162 | ||
163 | static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig) | |
164 | { | |
24c1f931 | 165 | struct snd_info_private_data *data; |
1da177e4 LT |
166 | struct snd_info_entry *entry; |
167 | loff_t ret; | |
168 | ||
169 | data = file->private_data; | |
170 | entry = data->entry; | |
171 | lock_kernel(); | |
172 | switch (entry->content) { | |
173 | case SNDRV_INFO_CONTENT_TEXT: | |
174 | switch (orig) { | |
e6f8f108 | 175 | case SEEK_SET: |
1da177e4 LT |
176 | file->f_pos = offset; |
177 | ret = file->f_pos; | |
178 | goto out; | |
e6f8f108 | 179 | case SEEK_CUR: |
1da177e4 LT |
180 | file->f_pos += offset; |
181 | ret = file->f_pos; | |
182 | goto out; | |
e6f8f108 | 183 | case SEEK_END: |
1da177e4 LT |
184 | default: |
185 | ret = -EINVAL; | |
186 | goto out; | |
187 | } | |
188 | break; | |
189 | case SNDRV_INFO_CONTENT_DATA: | |
190 | if (entry->c.ops->llseek) { | |
191 | ret = entry->c.ops->llseek(entry, | |
192 | data->file_private_data, | |
193 | file, offset, orig); | |
194 | goto out; | |
195 | } | |
196 | break; | |
197 | } | |
198 | ret = -ENXIO; | |
199 | out: | |
200 | unlock_kernel(); | |
201 | return ret; | |
202 | } | |
203 | ||
204 | static ssize_t snd_info_entry_read(struct file *file, char __user *buffer, | |
205 | size_t count, loff_t * offset) | |
206 | { | |
24c1f931 | 207 | struct snd_info_private_data *data; |
1da177e4 | 208 | struct snd_info_entry *entry; |
24c1f931 | 209 | struct snd_info_buffer *buf; |
1da177e4 LT |
210 | size_t size = 0; |
211 | loff_t pos; | |
212 | ||
213 | data = file->private_data; | |
7eaa943c TI |
214 | if (snd_BUG_ON(!data)) |
215 | return -ENXIO; | |
1da177e4 LT |
216 | pos = *offset; |
217 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
218 | return -EIO; | |
219 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
220 | return -EIO; | |
221 | entry = data->entry; | |
222 | switch (entry->content) { | |
223 | case SNDRV_INFO_CONTENT_TEXT: | |
224 | buf = data->rbuffer; | |
225 | if (buf == NULL) | |
226 | return -EIO; | |
227 | if (pos >= buf->size) | |
228 | return 0; | |
229 | size = buf->size - pos; | |
230 | size = min(count, size); | |
231 | if (copy_to_user(buffer, buf->buffer + pos, size)) | |
232 | return -EFAULT; | |
233 | break; | |
234 | case SNDRV_INFO_CONTENT_DATA: | |
235 | if (entry->c.ops->read) | |
236 | size = entry->c.ops->read(entry, | |
237 | data->file_private_data, | |
238 | file, buffer, count, pos); | |
239 | break; | |
240 | } | |
241 | if ((ssize_t) size > 0) | |
242 | *offset = pos + size; | |
243 | return size; | |
244 | } | |
245 | ||
246 | static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer, | |
247 | size_t count, loff_t * offset) | |
248 | { | |
24c1f931 | 249 | struct snd_info_private_data *data; |
1da177e4 | 250 | struct snd_info_entry *entry; |
24c1f931 | 251 | struct snd_info_buffer *buf; |
7e4eeec8 | 252 | ssize_t size = 0; |
1da177e4 LT |
253 | loff_t pos; |
254 | ||
255 | data = file->private_data; | |
7eaa943c TI |
256 | if (snd_BUG_ON(!data)) |
257 | return -ENXIO; | |
1da177e4 LT |
258 | entry = data->entry; |
259 | pos = *offset; | |
260 | if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) | |
261 | return -EIO; | |
262 | if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) | |
263 | return -EIO; | |
264 | switch (entry->content) { | |
265 | case SNDRV_INFO_CONTENT_TEXT: | |
266 | buf = data->wbuffer; | |
267 | if (buf == NULL) | |
268 | return -EIO; | |
f4a747f1 | 269 | mutex_lock(&entry->access); |
7e4eeec8 TI |
270 | if (pos + count >= buf->len) { |
271 | if (resize_info_buffer(buf, pos + count)) { | |
272 | mutex_unlock(&entry->access); | |
273 | return -ENOMEM; | |
274 | } | |
275 | } | |
276 | if (copy_from_user(buf->buffer + pos, buffer, count)) { | |
277 | mutex_unlock(&entry->access); | |
1da177e4 | 278 | return -EFAULT; |
7e4eeec8 TI |
279 | } |
280 | buf->size = pos + count; | |
281 | mutex_unlock(&entry->access); | |
282 | size = count; | |
1da177e4 LT |
283 | break; |
284 | case SNDRV_INFO_CONTENT_DATA: | |
285 | if (entry->c.ops->write) | |
286 | size = entry->c.ops->write(entry, | |
287 | data->file_private_data, | |
288 | file, buffer, count, pos); | |
289 | break; | |
290 | } | |
291 | if ((ssize_t) size > 0) | |
292 | *offset = pos + size; | |
293 | return size; | |
294 | } | |
295 | ||
296 | static int snd_info_entry_open(struct inode *inode, struct file *file) | |
297 | { | |
24c1f931 TI |
298 | struct snd_info_entry *entry; |
299 | struct snd_info_private_data *data; | |
300 | struct snd_info_buffer *buffer; | |
1da177e4 LT |
301 | struct proc_dir_entry *p; |
302 | int mode, err; | |
303 | ||
1a60d4c5 | 304 | mutex_lock(&info_mutex); |
1da177e4 | 305 | p = PDE(inode); |
24c1f931 | 306 | entry = p == NULL ? NULL : (struct snd_info_entry *)p->data; |
746d4a02 | 307 | if (entry == NULL || ! entry->p) { |
1a60d4c5 | 308 | mutex_unlock(&info_mutex); |
1da177e4 LT |
309 | return -ENODEV; |
310 | } | |
311 | if (!try_module_get(entry->module)) { | |
312 | err = -EFAULT; | |
313 | goto __error1; | |
314 | } | |
315 | mode = file->f_flags & O_ACCMODE; | |
316 | if (mode == O_RDONLY || mode == O_RDWR) { | |
7e4eeec8 | 317 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
1da177e4 LT |
318 | entry->c.ops->read == NULL)) { |
319 | err = -ENODEV; | |
320 | goto __error; | |
321 | } | |
322 | } | |
323 | if (mode == O_WRONLY || mode == O_RDWR) { | |
7e4eeec8 | 324 | if ((entry->content == SNDRV_INFO_CONTENT_DATA && |
1da177e4 LT |
325 | entry->c.ops->write == NULL)) { |
326 | err = -ENODEV; | |
327 | goto __error; | |
328 | } | |
329 | } | |
ca2c0966 | 330 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
331 | if (data == NULL) { |
332 | err = -ENOMEM; | |
333 | goto __error; | |
334 | } | |
335 | data->entry = entry; | |
336 | switch (entry->content) { | |
337 | case SNDRV_INFO_CONTENT_TEXT: | |
338 | if (mode == O_RDONLY || mode == O_RDWR) { | |
ca2c0966 | 339 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
7e4eeec8 TI |
340 | if (buffer == NULL) |
341 | goto __nomem; | |
1da177e4 | 342 | data->rbuffer = buffer; |
7e4eeec8 TI |
343 | buffer->len = PAGE_SIZE; |
344 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); | |
345 | if (buffer->buffer == NULL) | |
346 | goto __nomem; | |
1da177e4 LT |
347 | } |
348 | if (mode == O_WRONLY || mode == O_RDWR) { | |
ca2c0966 | 349 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
7e4eeec8 TI |
350 | if (buffer == NULL) |
351 | goto __nomem; | |
1da177e4 | 352 | data->wbuffer = buffer; |
7e4eeec8 TI |
353 | buffer->len = PAGE_SIZE; |
354 | buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); | |
355 | if (buffer->buffer == NULL) | |
356 | goto __nomem; | |
1da177e4 LT |
357 | } |
358 | break; | |
359 | case SNDRV_INFO_CONTENT_DATA: /* data */ | |
360 | if (entry->c.ops->open) { | |
361 | if ((err = entry->c.ops->open(entry, mode, | |
362 | &data->file_private_data)) < 0) { | |
363 | kfree(data); | |
364 | goto __error; | |
365 | } | |
366 | } | |
367 | break; | |
368 | } | |
369 | file->private_data = data; | |
1a60d4c5 | 370 | mutex_unlock(&info_mutex); |
1da177e4 LT |
371 | if (entry->content == SNDRV_INFO_CONTENT_TEXT && |
372 | (mode == O_RDONLY || mode == O_RDWR)) { | |
373 | if (entry->c.text.read) { | |
1a60d4c5 | 374 | mutex_lock(&entry->access); |
1da177e4 | 375 | entry->c.text.read(entry, data->rbuffer); |
1a60d4c5 | 376 | mutex_unlock(&entry->access); |
1da177e4 LT |
377 | } |
378 | } | |
379 | return 0; | |
380 | ||
7e4eeec8 TI |
381 | __nomem: |
382 | if (data->rbuffer) { | |
383 | kfree(data->rbuffer->buffer); | |
384 | kfree(data->rbuffer); | |
385 | } | |
386 | if (data->wbuffer) { | |
387 | kfree(data->wbuffer->buffer); | |
388 | kfree(data->wbuffer); | |
389 | } | |
390 | kfree(data); | |
391 | err = -ENOMEM; | |
1da177e4 LT |
392 | __error: |
393 | module_put(entry->module); | |
394 | __error1: | |
1a60d4c5 | 395 | mutex_unlock(&info_mutex); |
1da177e4 LT |
396 | return err; |
397 | } | |
398 | ||
399 | static int snd_info_entry_release(struct inode *inode, struct file *file) | |
400 | { | |
24c1f931 TI |
401 | struct snd_info_entry *entry; |
402 | struct snd_info_private_data *data; | |
1da177e4 LT |
403 | int mode; |
404 | ||
405 | mode = file->f_flags & O_ACCMODE; | |
406 | data = file->private_data; | |
407 | entry = data->entry; | |
408 | switch (entry->content) { | |
409 | case SNDRV_INFO_CONTENT_TEXT: | |
7e4eeec8 TI |
410 | if (data->rbuffer) { |
411 | kfree(data->rbuffer->buffer); | |
1da177e4 LT |
412 | kfree(data->rbuffer); |
413 | } | |
7e4eeec8 | 414 | if (data->wbuffer) { |
1da177e4 LT |
415 | if (entry->c.text.write) { |
416 | entry->c.text.write(entry, data->wbuffer); | |
417 | if (data->wbuffer->error) { | |
418 | snd_printk(KERN_WARNING "data write error to %s (%i)\n", | |
419 | entry->name, | |
420 | data->wbuffer->error); | |
421 | } | |
422 | } | |
7e4eeec8 | 423 | kfree(data->wbuffer->buffer); |
1da177e4 LT |
424 | kfree(data->wbuffer); |
425 | } | |
426 | break; | |
427 | case SNDRV_INFO_CONTENT_DATA: | |
428 | if (entry->c.ops->release) | |
429 | entry->c.ops->release(entry, mode, | |
430 | data->file_private_data); | |
431 | break; | |
432 | } | |
433 | module_put(entry->module); | |
434 | kfree(data); | |
435 | return 0; | |
436 | } | |
437 | ||
438 | static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait) | |
439 | { | |
24c1f931 | 440 | struct snd_info_private_data *data; |
1da177e4 LT |
441 | struct snd_info_entry *entry; |
442 | unsigned int mask; | |
443 | ||
444 | data = file->private_data; | |
445 | if (data == NULL) | |
446 | return 0; | |
447 | entry = data->entry; | |
448 | mask = 0; | |
449 | switch (entry->content) { | |
450 | case SNDRV_INFO_CONTENT_DATA: | |
451 | if (entry->c.ops->poll) | |
452 | return entry->c.ops->poll(entry, | |
453 | data->file_private_data, | |
454 | file, wait); | |
455 | if (entry->c.ops->read) | |
456 | mask |= POLLIN | POLLRDNORM; | |
457 | if (entry->c.ops->write) | |
458 | mask |= POLLOUT | POLLWRNORM; | |
459 | break; | |
460 | } | |
461 | return mask; | |
462 | } | |
463 | ||
d99e9889 IM |
464 | static long snd_info_entry_ioctl(struct file *file, unsigned int cmd, |
465 | unsigned long arg) | |
1da177e4 | 466 | { |
24c1f931 | 467 | struct snd_info_private_data *data; |
1da177e4 LT |
468 | struct snd_info_entry *entry; |
469 | ||
470 | data = file->private_data; | |
471 | if (data == NULL) | |
472 | return 0; | |
473 | entry = data->entry; | |
474 | switch (entry->content) { | |
475 | case SNDRV_INFO_CONTENT_DATA: | |
476 | if (entry->c.ops->ioctl) | |
477 | return entry->c.ops->ioctl(entry, | |
478 | data->file_private_data, | |
479 | file, cmd, arg); | |
480 | break; | |
481 | } | |
482 | return -ENOTTY; | |
483 | } | |
484 | ||
1da177e4 LT |
485 | static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma) |
486 | { | |
7bc56323 | 487 | struct inode *inode = file->f_path.dentry->d_inode; |
24c1f931 | 488 | struct snd_info_private_data *data; |
1da177e4 LT |
489 | struct snd_info_entry *entry; |
490 | ||
491 | data = file->private_data; | |
492 | if (data == NULL) | |
493 | return 0; | |
494 | entry = data->entry; | |
495 | switch (entry->content) { | |
496 | case SNDRV_INFO_CONTENT_DATA: | |
497 | if (entry->c.ops->mmap) | |
498 | return entry->c.ops->mmap(entry, | |
499 | data->file_private_data, | |
500 | inode, file, vma); | |
501 | break; | |
502 | } | |
503 | return -ENXIO; | |
504 | } | |
505 | ||
9c2e08c5 | 506 | static const struct file_operations snd_info_entry_operations = |
1da177e4 | 507 | { |
d99e9889 IM |
508 | .owner = THIS_MODULE, |
509 | .llseek = snd_info_entry_llseek, | |
510 | .read = snd_info_entry_read, | |
511 | .write = snd_info_entry_write, | |
512 | .poll = snd_info_entry_poll, | |
513 | .unlocked_ioctl = snd_info_entry_ioctl, | |
514 | .mmap = snd_info_entry_mmap, | |
515 | .open = snd_info_entry_open, | |
516 | .release = snd_info_entry_release, | |
1da177e4 LT |
517 | }; |
518 | ||
1da177e4 LT |
519 | int __init snd_info_init(void) |
520 | { | |
521 | struct proc_dir_entry *p; | |
522 | ||
99b76233 | 523 | p = create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, NULL); |
1da177e4 LT |
524 | if (p == NULL) |
525 | return -ENOMEM; | |
526 | snd_proc_root = p; | |
527 | #ifdef CONFIG_SND_OSSEMUL | |
528 | { | |
24c1f931 | 529 | struct snd_info_entry *entry; |
1da177e4 LT |
530 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL) |
531 | return -ENOMEM; | |
532 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
533 | if (snd_info_register(entry) < 0) { | |
534 | snd_info_free_entry(entry); | |
535 | return -ENOMEM; | |
536 | } | |
537 | snd_oss_root = entry; | |
538 | } | |
539 | #endif | |
540 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
541 | { | |
24c1f931 | 542 | struct snd_info_entry *entry; |
1da177e4 LT |
543 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL) |
544 | return -ENOMEM; | |
545 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
546 | if (snd_info_register(entry) < 0) { | |
547 | snd_info_free_entry(entry); | |
548 | return -ENOMEM; | |
549 | } | |
550 | snd_seq_root = entry; | |
551 | } | |
552 | #endif | |
553 | snd_info_version_init(); | |
1da177e4 LT |
554 | snd_minor_info_init(); |
555 | snd_minor_info_oss_init(); | |
556 | snd_card_info_init(); | |
557 | return 0; | |
558 | } | |
559 | ||
560 | int __exit snd_info_done(void) | |
561 | { | |
562 | snd_card_info_done(); | |
563 | snd_minor_info_oss_done(); | |
564 | snd_minor_info_done(); | |
1da177e4 LT |
565 | snd_info_version_done(); |
566 | if (snd_proc_root) { | |
567 | #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE) | |
746d4a02 | 568 | snd_info_free_entry(snd_seq_root); |
1da177e4 LT |
569 | #endif |
570 | #ifdef CONFIG_SND_OSSEMUL | |
746d4a02 | 571 | snd_info_free_entry(snd_oss_root); |
1da177e4 | 572 | #endif |
c74c120a | 573 | snd_remove_proc_entry(NULL, snd_proc_root); |
1da177e4 LT |
574 | } |
575 | return 0; | |
576 | } | |
577 | ||
578 | /* | |
579 | ||
580 | */ | |
581 | ||
582 | ||
583 | /* | |
584 | * create a card proc file | |
585 | * called from init.c | |
586 | */ | |
24c1f931 | 587 | int snd_info_card_create(struct snd_card *card) |
1da177e4 LT |
588 | { |
589 | char str[8]; | |
24c1f931 | 590 | struct snd_info_entry *entry; |
1da177e4 | 591 | |
7eaa943c TI |
592 | if (snd_BUG_ON(!card)) |
593 | return -ENXIO; | |
1da177e4 LT |
594 | |
595 | sprintf(str, "card%i", card->number); | |
596 | if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL) | |
597 | return -ENOMEM; | |
598 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
599 | if (snd_info_register(entry) < 0) { | |
600 | snd_info_free_entry(entry); | |
601 | return -ENOMEM; | |
602 | } | |
603 | card->proc_root = entry; | |
604 | return 0; | |
605 | } | |
606 | ||
607 | /* | |
608 | * register the card proc file | |
609 | * called from init.c | |
610 | */ | |
24c1f931 | 611 | int snd_info_card_register(struct snd_card *card) |
1da177e4 LT |
612 | { |
613 | struct proc_dir_entry *p; | |
614 | ||
7eaa943c TI |
615 | if (snd_BUG_ON(!card)) |
616 | return -ENXIO; | |
1da177e4 LT |
617 | |
618 | if (!strcmp(card->id, card->proc_root->name)) | |
619 | return 0; | |
620 | ||
621 | p = proc_symlink(card->id, snd_proc_root, card->proc_root->name); | |
622 | if (p == NULL) | |
623 | return -ENOMEM; | |
624 | card->proc_root_link = p; | |
625 | return 0; | |
626 | } | |
627 | ||
c2eb9c4e JK |
628 | /* |
629 | * called on card->id change | |
630 | */ | |
631 | void snd_info_card_id_change(struct snd_card *card) | |
632 | { | |
633 | mutex_lock(&info_mutex); | |
634 | if (card->proc_root_link) { | |
635 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); | |
636 | card->proc_root_link = NULL; | |
637 | } | |
638 | if (strcmp(card->id, card->proc_root->name)) | |
639 | card->proc_root_link = proc_symlink(card->id, | |
640 | snd_proc_root, | |
641 | card->proc_root->name); | |
642 | mutex_unlock(&info_mutex); | |
643 | } | |
644 | ||
1da177e4 LT |
645 | /* |
646 | * de-register the card proc file | |
647 | * called from init.c | |
648 | */ | |
746d4a02 | 649 | void snd_info_card_disconnect(struct snd_card *card) |
1da177e4 | 650 | { |
7eaa943c TI |
651 | if (!card) |
652 | return; | |
746d4a02 | 653 | mutex_lock(&info_mutex); |
1da177e4 LT |
654 | if (card->proc_root_link) { |
655 | snd_remove_proc_entry(snd_proc_root, card->proc_root_link); | |
656 | card->proc_root_link = NULL; | |
657 | } | |
746d4a02 TI |
658 | if (card->proc_root) |
659 | snd_info_disconnect(card->proc_root); | |
660 | mutex_unlock(&info_mutex); | |
661 | } | |
662 | ||
663 | /* | |
664 | * release the card proc file resources | |
665 | * called from init.c | |
666 | */ | |
667 | int snd_info_card_free(struct snd_card *card) | |
668 | { | |
7eaa943c TI |
669 | if (!card) |
670 | return 0; | |
746d4a02 TI |
671 | snd_info_free_entry(card->proc_root); |
672 | card->proc_root = NULL; | |
1da177e4 LT |
673 | return 0; |
674 | } | |
675 | ||
676 | ||
677 | /** | |
678 | * snd_info_get_line - read one line from the procfs buffer | |
679 | * @buffer: the procfs buffer | |
680 | * @line: the buffer to store | |
681 | * @len: the max. buffer size - 1 | |
682 | * | |
683 | * Reads one line from the buffer and stores the string. | |
684 | * | |
685 | * Returns zero if successful, or 1 if error or EOF. | |
686 | */ | |
24c1f931 | 687 | int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) |
1da177e4 LT |
688 | { |
689 | int c = -1; | |
690 | ||
691 | if (len <= 0 || buffer->stop || buffer->error) | |
692 | return 1; | |
693 | while (--len > 0) { | |
7e4eeec8 | 694 | c = buffer->buffer[buffer->curr++]; |
1da177e4 | 695 | if (c == '\n') { |
7e4eeec8 | 696 | if (buffer->curr >= buffer->size) |
1da177e4 | 697 | buffer->stop = 1; |
1da177e4 LT |
698 | break; |
699 | } | |
700 | *line++ = c; | |
7e4eeec8 | 701 | if (buffer->curr >= buffer->size) { |
1da177e4 LT |
702 | buffer->stop = 1; |
703 | break; | |
704 | } | |
705 | } | |
706 | while (c != '\n' && !buffer->stop) { | |
7e4eeec8 TI |
707 | c = buffer->buffer[buffer->curr++]; |
708 | if (buffer->curr >= buffer->size) | |
1da177e4 | 709 | buffer->stop = 1; |
1da177e4 LT |
710 | } |
711 | *line = '\0'; | |
712 | return 0; | |
713 | } | |
714 | ||
c0d3fb39 TI |
715 | EXPORT_SYMBOL(snd_info_get_line); |
716 | ||
1da177e4 | 717 | /** |
856def8a | 718 | * snd_info_get_str - parse a string token |
1da177e4 LT |
719 | * @dest: the buffer to store the string token |
720 | * @src: the original string | |
721 | * @len: the max. length of token - 1 | |
722 | * | |
723 | * Parses the original string and copy a token to the given | |
724 | * string buffer. | |
725 | * | |
726 | * Returns the updated pointer of the original string so that | |
727 | * it can be used for the next call. | |
728 | */ | |
4f7454a9 | 729 | const char *snd_info_get_str(char *dest, const char *src, int len) |
1da177e4 LT |
730 | { |
731 | int c; | |
732 | ||
733 | while (*src == ' ' || *src == '\t') | |
734 | src++; | |
735 | if (*src == '"' || *src == '\'') { | |
736 | c = *src++; | |
737 | while (--len > 0 && *src && *src != c) { | |
738 | *dest++ = *src++; | |
739 | } | |
740 | if (*src == c) | |
741 | src++; | |
742 | } else { | |
743 | while (--len > 0 && *src && *src != ' ' && *src != '\t') { | |
744 | *dest++ = *src++; | |
745 | } | |
746 | } | |
747 | *dest = 0; | |
748 | while (*src == ' ' || *src == '\t') | |
749 | src++; | |
750 | return src; | |
751 | } | |
752 | ||
c0d3fb39 TI |
753 | EXPORT_SYMBOL(snd_info_get_str); |
754 | ||
1da177e4 LT |
755 | /** |
756 | * snd_info_create_entry - create an info entry | |
757 | * @name: the proc file name | |
758 | * | |
759 | * Creates an info entry with the given file name and initializes as | |
760 | * the default state. | |
761 | * | |
762 | * Usually called from other functions such as | |
763 | * snd_info_create_card_entry(). | |
764 | * | |
765 | * Returns the pointer of the new instance, or NULL on failure. | |
766 | */ | |
24c1f931 | 767 | static struct snd_info_entry *snd_info_create_entry(const char *name) |
1da177e4 | 768 | { |
24c1f931 | 769 | struct snd_info_entry *entry; |
ca2c0966 | 770 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
1da177e4 LT |
771 | if (entry == NULL) |
772 | return NULL; | |
543537bd | 773 | entry->name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
774 | if (entry->name == NULL) { |
775 | kfree(entry); | |
776 | return NULL; | |
777 | } | |
778 | entry->mode = S_IFREG | S_IRUGO; | |
779 | entry->content = SNDRV_INFO_CONTENT_TEXT; | |
1a60d4c5 | 780 | mutex_init(&entry->access); |
746d4a02 TI |
781 | INIT_LIST_HEAD(&entry->children); |
782 | INIT_LIST_HEAD(&entry->list); | |
1da177e4 LT |
783 | return entry; |
784 | } | |
785 | ||
786 | /** | |
787 | * snd_info_create_module_entry - create an info entry for the given module | |
788 | * @module: the module pointer | |
789 | * @name: the file name | |
790 | * @parent: the parent directory | |
791 | * | |
792 | * Creates a new info entry and assigns it to the given module. | |
793 | * | |
794 | * Returns the pointer of the new instance, or NULL on failure. | |
795 | */ | |
24c1f931 | 796 | struct snd_info_entry *snd_info_create_module_entry(struct module * module, |
1da177e4 | 797 | const char *name, |
24c1f931 | 798 | struct snd_info_entry *parent) |
1da177e4 | 799 | { |
24c1f931 | 800 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
801 | if (entry) { |
802 | entry->module = module; | |
803 | entry->parent = parent; | |
804 | } | |
805 | return entry; | |
806 | } | |
807 | ||
c0d3fb39 TI |
808 | EXPORT_SYMBOL(snd_info_create_module_entry); |
809 | ||
1da177e4 LT |
810 | /** |
811 | * snd_info_create_card_entry - create an info entry for the given card | |
812 | * @card: the card instance | |
813 | * @name: the file name | |
814 | * @parent: the parent directory | |
815 | * | |
816 | * Creates a new info entry and assigns it to the given card. | |
817 | * | |
818 | * Returns the pointer of the new instance, or NULL on failure. | |
819 | */ | |
24c1f931 | 820 | struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, |
1da177e4 | 821 | const char *name, |
24c1f931 | 822 | struct snd_info_entry * parent) |
1da177e4 | 823 | { |
24c1f931 | 824 | struct snd_info_entry *entry = snd_info_create_entry(name); |
1da177e4 LT |
825 | if (entry) { |
826 | entry->module = card->module; | |
827 | entry->card = card; | |
828 | entry->parent = parent; | |
829 | } | |
830 | return entry; | |
831 | } | |
832 | ||
c0d3fb39 TI |
833 | EXPORT_SYMBOL(snd_info_create_card_entry); |
834 | ||
746d4a02 | 835 | static void snd_info_disconnect(struct snd_info_entry *entry) |
1da177e4 | 836 | { |
746d4a02 TI |
837 | struct list_head *p, *n; |
838 | struct proc_dir_entry *root; | |
1da177e4 | 839 | |
746d4a02 TI |
840 | list_for_each_safe(p, n, &entry->children) { |
841 | snd_info_disconnect(list_entry(p, struct snd_info_entry, list)); | |
842 | } | |
843 | ||
844 | if (! entry->p) | |
845 | return; | |
846 | list_del_init(&entry->list); | |
847 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; | |
7eaa943c | 848 | snd_BUG_ON(!root); |
746d4a02 TI |
849 | snd_remove_proc_entry(root, entry->p); |
850 | entry->p = NULL; | |
1da177e4 LT |
851 | } |
852 | ||
746d4a02 | 853 | static int snd_info_dev_free_entry(struct snd_device *device) |
1da177e4 | 854 | { |
24c1f931 | 855 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 856 | snd_info_free_entry(entry); |
1da177e4 LT |
857 | return 0; |
858 | } | |
859 | ||
746d4a02 | 860 | static int snd_info_dev_register_entry(struct snd_device *device) |
1da177e4 | 861 | { |
24c1f931 | 862 | struct snd_info_entry *entry = device->device_data; |
746d4a02 | 863 | return snd_info_register(entry); |
1da177e4 LT |
864 | } |
865 | ||
866 | /** | |
867 | * snd_card_proc_new - create an info entry for the given card | |
868 | * @card: the card instance | |
869 | * @name: the file name | |
870 | * @entryp: the pointer to store the new info entry | |
871 | * | |
872 | * Creates a new info entry and assigns it to the given card. | |
873 | * Unlike snd_info_create_card_entry(), this function registers the | |
874 | * info entry as an ALSA device component, so that it can be | |
875 | * unregistered/released without explicit call. | |
876 | * Also, you don't have to register this entry via snd_info_register(), | |
877 | * since this will be registered by snd_card_register() automatically. | |
878 | * | |
879 | * The parent is assumed as card->proc_root. | |
880 | * | |
881 | * For releasing this entry, use snd_device_free() instead of | |
882 | * snd_info_free_entry(). | |
883 | * | |
884 | * Returns zero if successful, or a negative error code on failure. | |
885 | */ | |
24c1f931 TI |
886 | int snd_card_proc_new(struct snd_card *card, const char *name, |
887 | struct snd_info_entry **entryp) | |
1da177e4 | 888 | { |
24c1f931 | 889 | static struct snd_device_ops ops = { |
1da177e4 LT |
890 | .dev_free = snd_info_dev_free_entry, |
891 | .dev_register = snd_info_dev_register_entry, | |
746d4a02 | 892 | /* disconnect is done via snd_info_card_disconnect() */ |
1da177e4 | 893 | }; |
24c1f931 | 894 | struct snd_info_entry *entry; |
1da177e4 LT |
895 | int err; |
896 | ||
897 | entry = snd_info_create_card_entry(card, name, card->proc_root); | |
898 | if (! entry) | |
899 | return -ENOMEM; | |
900 | if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) { | |
901 | snd_info_free_entry(entry); | |
902 | return err; | |
903 | } | |
904 | if (entryp) | |
905 | *entryp = entry; | |
906 | return 0; | |
907 | } | |
908 | ||
c0d3fb39 TI |
909 | EXPORT_SYMBOL(snd_card_proc_new); |
910 | ||
1da177e4 LT |
911 | /** |
912 | * snd_info_free_entry - release the info entry | |
913 | * @entry: the info entry | |
914 | * | |
915 | * Releases the info entry. Don't call this after registered. | |
916 | */ | |
24c1f931 | 917 | void snd_info_free_entry(struct snd_info_entry * entry) |
1da177e4 LT |
918 | { |
919 | if (entry == NULL) | |
920 | return; | |
746d4a02 TI |
921 | if (entry->p) { |
922 | mutex_lock(&info_mutex); | |
923 | snd_info_disconnect(entry); | |
924 | mutex_unlock(&info_mutex); | |
925 | } | |
1da177e4 LT |
926 | kfree(entry->name); |
927 | if (entry->private_free) | |
928 | entry->private_free(entry); | |
929 | kfree(entry); | |
930 | } | |
931 | ||
c0d3fb39 TI |
932 | EXPORT_SYMBOL(snd_info_free_entry); |
933 | ||
1da177e4 LT |
934 | /** |
935 | * snd_info_register - register the info entry | |
936 | * @entry: the info entry | |
937 | * | |
938 | * Registers the proc info entry. | |
939 | * | |
940 | * Returns zero if successful, or a negative error code on failure. | |
941 | */ | |
24c1f931 | 942 | int snd_info_register(struct snd_info_entry * entry) |
1da177e4 LT |
943 | { |
944 | struct proc_dir_entry *root, *p = NULL; | |
945 | ||
7eaa943c TI |
946 | if (snd_BUG_ON(!entry)) |
947 | return -ENXIO; | |
1da177e4 | 948 | root = entry->parent == NULL ? snd_proc_root : entry->parent->p; |
1a60d4c5 | 949 | mutex_lock(&info_mutex); |
99b76233 | 950 | p = create_proc_entry(entry->name, entry->mode, root); |
1da177e4 | 951 | if (!p) { |
1a60d4c5 | 952 | mutex_unlock(&info_mutex); |
1da177e4 LT |
953 | return -ENOMEM; |
954 | } | |
1da177e4 LT |
955 | if (!S_ISDIR(entry->mode)) |
956 | p->proc_fops = &snd_info_entry_operations; | |
957 | p->size = entry->size; | |
958 | p->data = entry; | |
959 | entry->p = p; | |
746d4a02 TI |
960 | if (entry->parent) |
961 | list_add_tail(&entry->list, &entry->parent->children); | |
1a60d4c5 | 962 | mutex_unlock(&info_mutex); |
1da177e4 LT |
963 | return 0; |
964 | } | |
965 | ||
c0d3fb39 TI |
966 | EXPORT_SYMBOL(snd_info_register); |
967 | ||
1da177e4 LT |
968 | /* |
969 | ||
970 | */ | |
971 | ||
6581f4e7 | 972 | static struct snd_info_entry *snd_info_version_entry; |
1da177e4 | 973 | |
24c1f931 | 974 | static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) |
1da177e4 LT |
975 | { |
976 | snd_iprintf(buffer, | |
977 | "Advanced Linux Sound Architecture Driver Version " | |
978 | CONFIG_SND_VERSION CONFIG_SND_DATE ".\n" | |
979 | ); | |
980 | } | |
981 | ||
982 | static int __init snd_info_version_init(void) | |
983 | { | |
24c1f931 | 984 | struct snd_info_entry *entry; |
1da177e4 LT |
985 | |
986 | entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL); | |
987 | if (entry == NULL) | |
988 | return -ENOMEM; | |
1da177e4 LT |
989 | entry->c.text.read = snd_info_version_read; |
990 | if (snd_info_register(entry) < 0) { | |
991 | snd_info_free_entry(entry); | |
992 | return -ENOMEM; | |
993 | } | |
994 | snd_info_version_entry = entry; | |
995 | return 0; | |
996 | } | |
997 | ||
998 | static int __exit snd_info_version_done(void) | |
999 | { | |
746d4a02 | 1000 | snd_info_free_entry(snd_info_version_entry); |
1da177e4 LT |
1001 | return 0; |
1002 | } | |
1003 | ||
1004 | #endif /* CONFIG_PROC_FS */ |