blob: b70564ed8b37821aa0f336d3585acf58da5854e3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Information interface for ALSA driver
Jaroslav Kyselac1017a42007-10-15 09:50:19 +02003 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/time.h>
Andrea Righi27ac7922008-07-23 21:28:13 -070024#include <linux/mm.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090025#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/smp_lock.h>
Paulo Marques543537b2005-06-23 00:09:02 -070027#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#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>
Ingo Molnar1a60d4c2006-01-16 16:29:08 +010033#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <stdarg.h>
35
36/*
37 *
38 */
39
Takashi Iwaie28563c2005-12-01 10:42:42 +010040#ifdef CONFIG_PROC_FS
41
Linus Torvalds1da177e2005-04-16 15:20:36 -070042int 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
Ingo Molnar1a60d4c2006-01-16 16:29:08 +010071static DEFINE_MUTEX(info_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
Takashi Iwai24c1f932005-11-17 13:58:48 +010073struct snd_info_private_data {
74 struct snd_info_buffer *rbuffer;
75 struct snd_info_buffer *wbuffer;
76 struct snd_info_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 void *file_private_data;
Takashi Iwai24c1f932005-11-17 13:58:48 +010078};
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
80static int snd_info_version_init(void);
81static int snd_info_version_done(void);
Takashi Iwai746d4a02006-06-23 14:37:59 +020082static void snd_info_disconnect(struct snd_info_entry *entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
84
Takashi Iwai7e4eeec2006-04-28 15:13:40 +020085/* resize the proc r/w buffer */
86static int resize_info_buffer(struct snd_info_buffer *buffer,
87 unsigned int nsize)
88{
89 char *nbuf;
90
91 nsize = PAGE_ALIGN(nsize);
Takashi Iwai9983aa62009-07-06 14:31:59 +020092 nbuf = krealloc(buffer->buffer, nsize, GFP_KERNEL);
Takashi Iwai7e4eeec2006-04-28 15:13:40 +020093 if (! nbuf)
94 return -ENOMEM;
95
Takashi Iwai7e4eeec2006-04-28 15:13:40 +020096 buffer->buffer = nbuf;
97 buffer->len = nsize;
98 return 0;
99}
100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101/**
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 */
Takashi Iwai4f7454a2009-09-08 14:29:58 +0200110int snd_iprintf(struct snd_info_buffer *buffer, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111{
112 va_list args;
113 int len, res;
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200114 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
Takashi Iwaif001c3a2006-04-28 15:13:41 +0200116 might_sleep();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 if (buffer->stop || buffer->error)
118 return 0;
119 len = buffer->len - buffer->size;
120 va_start(args, fmt);
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200121 for (;;) {
Takashi Iwaidbedca32006-10-18 19:09:46 +0200122 va_list ap;
123 va_copy(ap, args);
124 res = vsnprintf(buffer->buffer + buffer->curr, len, fmt, ap);
125 va_end(ap);
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200126 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 }
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200133 va_end(args);
134
135 if (err < 0)
136 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 buffer->curr += res;
138 buffer->size += res;
139 return res;
140}
141
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200142EXPORT_SYMBOL(snd_iprintf);
143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144/*
145
146 */
147
Takashi Iwai6581f4e2006-05-17 17:14:51 +0200148static struct proc_dir_entry *snd_proc_root;
149struct snd_info_entry *snd_seq_root;
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200150EXPORT_SYMBOL(snd_seq_root);
151
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152#ifdef CONFIG_SND_OSSEMUL
Takashi Iwai6581f4e2006-05-17 17:14:51 +0200153struct snd_info_entry *snd_oss_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154#endif
155
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156static 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
163static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
164{
Takashi Iwai24c1f932005-11-17 13:58:48 +0100165 struct snd_info_private_data *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 struct snd_info_entry *entry;
Takashi Iwai73029e02010-04-13 11:39:47 +0200167 loff_t ret = -EINVAL, size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
169 data = file->private_data;
170 entry = data->entry;
Takashi Iwai5b5cd552010-04-07 18:33:57 +0200171 mutex_lock(&entry->access);
Takashi Iwai73029e02010-04-13 11:39:47 +0200172 if (entry->content == SNDRV_INFO_CONTENT_DATA &&
173 entry->c.ops->llseek) {
174 offset = entry->c.ops->llseek(entry,
175 data->file_private_data,
176 file, offset, orig);
177 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 }
Takashi Iwai73029e02010-04-13 11:39:47 +0200179 if (entry->content == SNDRV_INFO_CONTENT_DATA)
180 size = entry->size;
181 else
182 size = 0;
183 switch (orig) {
184 case SEEK_SET:
185 break;
186 case SEEK_CUR:
187 offset += file->f_pos;
188 break;
189 case SEEK_END:
190 if (!size)
191 goto out;
192 offset += size;
193 break;
194 default:
195 goto out;
196 }
197 if (offset < 0)
198 goto out;
199 if (size && offset > size)
200 offset = size;
201 file->f_pos = offset;
202 ret = offset;
203 out:
Takashi Iwai5b5cd552010-04-07 18:33:57 +0200204 mutex_unlock(&entry->access);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 return ret;
206}
207
208static ssize_t snd_info_entry_read(struct file *file, char __user *buffer,
209 size_t count, loff_t * offset)
210{
Takashi Iwai24c1f932005-11-17 13:58:48 +0100211 struct snd_info_private_data *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 struct snd_info_entry *entry;
Takashi Iwai24c1f932005-11-17 13:58:48 +0100213 struct snd_info_buffer *buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 size_t size = 0;
215 loff_t pos;
216
217 data = file->private_data;
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200218 if (snd_BUG_ON(!data))
219 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 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:
Takashi Iwaid97e1b72010-04-13 11:33:54 +0200239 if (pos >= entry->size)
240 return 0;
241 if (entry->c.ops->read) {
242 size = entry->size - pos;
243 size = min(count, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 size = entry->c.ops->read(entry,
245 data->file_private_data,
Takashi Iwaid97e1b72010-04-13 11:33:54 +0200246 file, buffer, size, pos);
247 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 break;
249 }
250 if ((ssize_t) size > 0)
251 *offset = pos + size;
252 return size;
253}
254
255static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer,
256 size_t count, loff_t * offset)
257{
Takashi Iwai24c1f932005-11-17 13:58:48 +0100258 struct snd_info_private_data *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 struct snd_info_entry *entry;
Takashi Iwai24c1f932005-11-17 13:58:48 +0100260 struct snd_info_buffer *buf;
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200261 ssize_t size = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 loff_t pos;
263
264 data = file->private_data;
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200265 if (snd_BUG_ON(!data))
266 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 entry = data->entry;
268 pos = *offset;
269 if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
270 return -EIO;
271 if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
272 return -EIO;
273 switch (entry->content) {
274 case SNDRV_INFO_CONTENT_TEXT:
275 buf = data->wbuffer;
276 if (buf == NULL)
277 return -EIO;
Clemens Ladischf4a747f2006-05-02 15:33:25 +0200278 mutex_lock(&entry->access);
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200279 if (pos + count >= buf->len) {
280 if (resize_info_buffer(buf, pos + count)) {
281 mutex_unlock(&entry->access);
282 return -ENOMEM;
283 }
284 }
285 if (copy_from_user(buf->buffer + pos, buffer, count)) {
286 mutex_unlock(&entry->access);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 return -EFAULT;
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200288 }
289 buf->size = pos + count;
290 mutex_unlock(&entry->access);
291 size = count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 break;
293 case SNDRV_INFO_CONTENT_DATA:
Takashi Iwaid97e1b72010-04-13 11:33:54 +0200294 if (entry->c.ops->write && count > 0) {
295 size_t maxsize = entry->size - pos;
296 count = min(count, maxsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 size = entry->c.ops->write(entry,
298 data->file_private_data,
299 file, buffer, count, pos);
Takashi Iwaid97e1b72010-04-13 11:33:54 +0200300 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 break;
302 }
303 if ((ssize_t) size > 0)
304 *offset = pos + size;
305 return size;
306}
307
308static int snd_info_entry_open(struct inode *inode, struct file *file)
309{
Takashi Iwai24c1f932005-11-17 13:58:48 +0100310 struct snd_info_entry *entry;
311 struct snd_info_private_data *data;
312 struct snd_info_buffer *buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 struct proc_dir_entry *p;
314 int mode, err;
315
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100316 mutex_lock(&info_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 p = PDE(inode);
Takashi Iwai24c1f932005-11-17 13:58:48 +0100318 entry = p == NULL ? NULL : (struct snd_info_entry *)p->data;
Takashi Iwai746d4a02006-06-23 14:37:59 +0200319 if (entry == NULL || ! entry->p) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100320 mutex_unlock(&info_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 return -ENODEV;
322 }
323 if (!try_module_get(entry->module)) {
324 err = -EFAULT;
325 goto __error1;
326 }
327 mode = file->f_flags & O_ACCMODE;
328 if (mode == O_RDONLY || mode == O_RDWR) {
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200329 if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 entry->c.ops->read == NULL)) {
331 err = -ENODEV;
332 goto __error;
333 }
334 }
335 if (mode == O_WRONLY || mode == O_RDWR) {
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200336 if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 entry->c.ops->write == NULL)) {
338 err = -ENODEV;
339 goto __error;
340 }
341 }
Takashi Iwaica2c0962005-09-09 14:20:23 +0200342 data = kzalloc(sizeof(*data), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 if (data == NULL) {
344 err = -ENOMEM;
345 goto __error;
346 }
347 data->entry = entry;
348 switch (entry->content) {
349 case SNDRV_INFO_CONTENT_TEXT:
350 if (mode == O_RDONLY || mode == O_RDWR) {
Takashi Iwaica2c0962005-09-09 14:20:23 +0200351 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200352 if (buffer == NULL)
353 goto __nomem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 data->rbuffer = buffer;
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200355 buffer->len = PAGE_SIZE;
356 buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
357 if (buffer->buffer == NULL)
358 goto __nomem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 }
360 if (mode == O_WRONLY || mode == O_RDWR) {
Takashi Iwaica2c0962005-09-09 14:20:23 +0200361 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200362 if (buffer == NULL)
363 goto __nomem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 data->wbuffer = buffer;
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200365 buffer->len = PAGE_SIZE;
366 buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
367 if (buffer->buffer == NULL)
368 goto __nomem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 }
370 break;
371 case SNDRV_INFO_CONTENT_DATA: /* data */
372 if (entry->c.ops->open) {
373 if ((err = entry->c.ops->open(entry, mode,
374 &data->file_private_data)) < 0) {
375 kfree(data);
376 goto __error;
377 }
378 }
379 break;
380 }
381 file->private_data = data;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100382 mutex_unlock(&info_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 if (entry->content == SNDRV_INFO_CONTENT_TEXT &&
384 (mode == O_RDONLY || mode == O_RDWR)) {
385 if (entry->c.text.read) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100386 mutex_lock(&entry->access);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 entry->c.text.read(entry, data->rbuffer);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100388 mutex_unlock(&entry->access);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 }
390 }
391 return 0;
392
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200393 __nomem:
394 if (data->rbuffer) {
395 kfree(data->rbuffer->buffer);
396 kfree(data->rbuffer);
397 }
398 if (data->wbuffer) {
399 kfree(data->wbuffer->buffer);
400 kfree(data->wbuffer);
401 }
402 kfree(data);
403 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 __error:
405 module_put(entry->module);
406 __error1:
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100407 mutex_unlock(&info_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 return err;
409}
410
411static int snd_info_entry_release(struct inode *inode, struct file *file)
412{
Takashi Iwai24c1f932005-11-17 13:58:48 +0100413 struct snd_info_entry *entry;
414 struct snd_info_private_data *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 int mode;
416
417 mode = file->f_flags & O_ACCMODE;
418 data = file->private_data;
419 entry = data->entry;
420 switch (entry->content) {
421 case SNDRV_INFO_CONTENT_TEXT:
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200422 if (data->rbuffer) {
423 kfree(data->rbuffer->buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 kfree(data->rbuffer);
425 }
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200426 if (data->wbuffer) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 if (entry->c.text.write) {
428 entry->c.text.write(entry, data->wbuffer);
429 if (data->wbuffer->error) {
430 snd_printk(KERN_WARNING "data write error to %s (%i)\n",
431 entry->name,
432 data->wbuffer->error);
433 }
434 }
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200435 kfree(data->wbuffer->buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 kfree(data->wbuffer);
437 }
438 break;
439 case SNDRV_INFO_CONTENT_DATA:
440 if (entry->c.ops->release)
441 entry->c.ops->release(entry, mode,
442 data->file_private_data);
443 break;
444 }
445 module_put(entry->module);
446 kfree(data);
447 return 0;
448}
449
450static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait)
451{
Takashi Iwai24c1f932005-11-17 13:58:48 +0100452 struct snd_info_private_data *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 struct snd_info_entry *entry;
454 unsigned int mask;
455
456 data = file->private_data;
457 if (data == NULL)
458 return 0;
459 entry = data->entry;
460 mask = 0;
461 switch (entry->content) {
462 case SNDRV_INFO_CONTENT_DATA:
463 if (entry->c.ops->poll)
464 return entry->c.ops->poll(entry,
465 data->file_private_data,
466 file, wait);
467 if (entry->c.ops->read)
468 mask |= POLLIN | POLLRDNORM;
469 if (entry->c.ops->write)
470 mask |= POLLOUT | POLLWRNORM;
471 break;
472 }
473 return mask;
474}
475
Ingo Molnard99e9882006-01-09 16:44:46 +0100476static long snd_info_entry_ioctl(struct file *file, unsigned int cmd,
477 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478{
Takashi Iwai24c1f932005-11-17 13:58:48 +0100479 struct snd_info_private_data *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 struct snd_info_entry *entry;
481
482 data = file->private_data;
483 if (data == NULL)
484 return 0;
485 entry = data->entry;
486 switch (entry->content) {
487 case SNDRV_INFO_CONTENT_DATA:
488 if (entry->c.ops->ioctl)
489 return entry->c.ops->ioctl(entry,
490 data->file_private_data,
491 file, cmd, arg);
492 break;
493 }
494 return -ENOTTY;
495}
496
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma)
498{
Josef Sipek7bc56322006-12-08 02:37:40 -0800499 struct inode *inode = file->f_path.dentry->d_inode;
Takashi Iwai24c1f932005-11-17 13:58:48 +0100500 struct snd_info_private_data *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 struct snd_info_entry *entry;
502
503 data = file->private_data;
504 if (data == NULL)
505 return 0;
506 entry = data->entry;
507 switch (entry->content) {
508 case SNDRV_INFO_CONTENT_DATA:
509 if (entry->c.ops->mmap)
510 return entry->c.ops->mmap(entry,
511 data->file_private_data,
512 inode, file, vma);
513 break;
514 }
515 return -ENXIO;
516}
517
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800518static const struct file_operations snd_info_entry_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519{
Ingo Molnard99e9882006-01-09 16:44:46 +0100520 .owner = THIS_MODULE,
521 .llseek = snd_info_entry_llseek,
522 .read = snd_info_entry_read,
523 .write = snd_info_entry_write,
524 .poll = snd_info_entry_poll,
525 .unlocked_ioctl = snd_info_entry_ioctl,
526 .mmap = snd_info_entry_mmap,
527 .open = snd_info_entry_open,
528 .release = snd_info_entry_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529};
530
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531int __init snd_info_init(void)
532{
533 struct proc_dir_entry *p;
534
Alexey Dobriyan99b76232009-03-25 22:48:06 +0300535 p = create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 if (p == NULL)
537 return -ENOMEM;
538 snd_proc_root = p;
539#ifdef CONFIG_SND_OSSEMUL
540 {
Takashi Iwai24c1f932005-11-17 13:58:48 +0100541 struct snd_info_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL)
543 return -ENOMEM;
544 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
545 if (snd_info_register(entry) < 0) {
546 snd_info_free_entry(entry);
547 return -ENOMEM;
548 }
549 snd_oss_root = entry;
550 }
551#endif
552#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
553 {
Takashi Iwai24c1f932005-11-17 13:58:48 +0100554 struct snd_info_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL)
556 return -ENOMEM;
557 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
558 if (snd_info_register(entry) < 0) {
559 snd_info_free_entry(entry);
560 return -ENOMEM;
561 }
562 snd_seq_root = entry;
563 }
564#endif
565 snd_info_version_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 snd_minor_info_init();
567 snd_minor_info_oss_init();
568 snd_card_info_init();
569 return 0;
570}
571
572int __exit snd_info_done(void)
573{
574 snd_card_info_done();
575 snd_minor_info_oss_done();
576 snd_minor_info_done();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 snd_info_version_done();
578 if (snd_proc_root) {
579#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
Takashi Iwai746d4a02006-06-23 14:37:59 +0200580 snd_info_free_entry(snd_seq_root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581#endif
582#ifdef CONFIG_SND_OSSEMUL
Takashi Iwai746d4a02006-06-23 14:37:59 +0200583 snd_info_free_entry(snd_oss_root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584#endif
Alexey Dobriyanc74c1202008-04-29 01:01:44 -0700585 snd_remove_proc_entry(NULL, snd_proc_root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 }
587 return 0;
588}
589
590/*
591
592 */
593
594
595/*
596 * create a card proc file
597 * called from init.c
598 */
Takashi Iwai24c1f932005-11-17 13:58:48 +0100599int snd_info_card_create(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600{
601 char str[8];
Takashi Iwai24c1f932005-11-17 13:58:48 +0100602 struct snd_info_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200604 if (snd_BUG_ON(!card))
605 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606
607 sprintf(str, "card%i", card->number);
608 if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL)
609 return -ENOMEM;
610 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
611 if (snd_info_register(entry) < 0) {
612 snd_info_free_entry(entry);
613 return -ENOMEM;
614 }
615 card->proc_root = entry;
616 return 0;
617}
618
619/*
620 * register the card proc file
621 * called from init.c
622 */
Takashi Iwai24c1f932005-11-17 13:58:48 +0100623int snd_info_card_register(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624{
625 struct proc_dir_entry *p;
626
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200627 if (snd_BUG_ON(!card))
628 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629
630 if (!strcmp(card->id, card->proc_root->name))
631 return 0;
632
633 p = proc_symlink(card->id, snd_proc_root, card->proc_root->name);
634 if (p == NULL)
635 return -ENOMEM;
636 card->proc_root_link = p;
637 return 0;
638}
639
640/*
Jaroslav Kyselac2eb9c42008-11-12 16:31:37 +0100641 * called on card->id change
642 */
643void snd_info_card_id_change(struct snd_card *card)
644{
645 mutex_lock(&info_mutex);
646 if (card->proc_root_link) {
647 snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
648 card->proc_root_link = NULL;
649 }
650 if (strcmp(card->id, card->proc_root->name))
651 card->proc_root_link = proc_symlink(card->id,
652 snd_proc_root,
653 card->proc_root->name);
654 mutex_unlock(&info_mutex);
655}
656
657/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 * de-register the card proc file
659 * called from init.c
660 */
Takashi Iwai746d4a02006-06-23 14:37:59 +0200661void snd_info_card_disconnect(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662{
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200663 if (!card)
664 return;
Takashi Iwai746d4a02006-06-23 14:37:59 +0200665 mutex_lock(&info_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 if (card->proc_root_link) {
667 snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
668 card->proc_root_link = NULL;
669 }
Takashi Iwai746d4a02006-06-23 14:37:59 +0200670 if (card->proc_root)
671 snd_info_disconnect(card->proc_root);
672 mutex_unlock(&info_mutex);
673}
674
675/*
676 * release the card proc file resources
677 * called from init.c
678 */
679int snd_info_card_free(struct snd_card *card)
680{
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200681 if (!card)
682 return 0;
Takashi Iwai746d4a02006-06-23 14:37:59 +0200683 snd_info_free_entry(card->proc_root);
684 card->proc_root = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 return 0;
686}
687
688
689/**
690 * snd_info_get_line - read one line from the procfs buffer
691 * @buffer: the procfs buffer
692 * @line: the buffer to store
693 * @len: the max. buffer size - 1
694 *
695 * Reads one line from the buffer and stores the string.
696 *
697 * Returns zero if successful, or 1 if error or EOF.
698 */
Takashi Iwai24c1f932005-11-17 13:58:48 +0100699int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700{
701 int c = -1;
702
703 if (len <= 0 || buffer->stop || buffer->error)
704 return 1;
705 while (--len > 0) {
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200706 c = buffer->buffer[buffer->curr++];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 if (c == '\n') {
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200708 if (buffer->curr >= buffer->size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 buffer->stop = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 break;
711 }
712 *line++ = c;
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200713 if (buffer->curr >= buffer->size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 buffer->stop = 1;
715 break;
716 }
717 }
718 while (c != '\n' && !buffer->stop) {
Takashi Iwai7e4eeec2006-04-28 15:13:40 +0200719 c = buffer->buffer[buffer->curr++];
720 if (buffer->curr >= buffer->size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 buffer->stop = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 }
723 *line = '\0';
724 return 0;
725}
726
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200727EXPORT_SYMBOL(snd_info_get_line);
728
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729/**
Henrik Kretzschmar856def82005-07-08 13:53:42 +0200730 * snd_info_get_str - parse a string token
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 * @dest: the buffer to store the string token
732 * @src: the original string
733 * @len: the max. length of token - 1
734 *
735 * Parses the original string and copy a token to the given
736 * string buffer.
737 *
738 * Returns the updated pointer of the original string so that
739 * it can be used for the next call.
740 */
Takashi Iwai4f7454a2009-09-08 14:29:58 +0200741const char *snd_info_get_str(char *dest, const char *src, int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742{
743 int c;
744
745 while (*src == ' ' || *src == '\t')
746 src++;
747 if (*src == '"' || *src == '\'') {
748 c = *src++;
749 while (--len > 0 && *src && *src != c) {
750 *dest++ = *src++;
751 }
752 if (*src == c)
753 src++;
754 } else {
755 while (--len > 0 && *src && *src != ' ' && *src != '\t') {
756 *dest++ = *src++;
757 }
758 }
759 *dest = 0;
760 while (*src == ' ' || *src == '\t')
761 src++;
762 return src;
763}
764
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200765EXPORT_SYMBOL(snd_info_get_str);
766
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767/**
768 * snd_info_create_entry - create an info entry
769 * @name: the proc file name
770 *
771 * Creates an info entry with the given file name and initializes as
772 * the default state.
773 *
774 * Usually called from other functions such as
775 * snd_info_create_card_entry().
776 *
777 * Returns the pointer of the new instance, or NULL on failure.
778 */
Takashi Iwai24c1f932005-11-17 13:58:48 +0100779static struct snd_info_entry *snd_info_create_entry(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780{
Takashi Iwai24c1f932005-11-17 13:58:48 +0100781 struct snd_info_entry *entry;
Takashi Iwaica2c0962005-09-09 14:20:23 +0200782 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 if (entry == NULL)
784 return NULL;
Paulo Marques543537b2005-06-23 00:09:02 -0700785 entry->name = kstrdup(name, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 if (entry->name == NULL) {
787 kfree(entry);
788 return NULL;
789 }
790 entry->mode = S_IFREG | S_IRUGO;
791 entry->content = SNDRV_INFO_CONTENT_TEXT;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100792 mutex_init(&entry->access);
Takashi Iwai746d4a02006-06-23 14:37:59 +0200793 INIT_LIST_HEAD(&entry->children);
794 INIT_LIST_HEAD(&entry->list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 return entry;
796}
797
798/**
799 * snd_info_create_module_entry - create an info entry for the given module
800 * @module: the module pointer
801 * @name: the file name
802 * @parent: the parent directory
803 *
804 * Creates a new info entry and assigns it to the given module.
805 *
806 * Returns the pointer of the new instance, or NULL on failure.
807 */
Takashi Iwai24c1f932005-11-17 13:58:48 +0100808struct snd_info_entry *snd_info_create_module_entry(struct module * module,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 const char *name,
Takashi Iwai24c1f932005-11-17 13:58:48 +0100810 struct snd_info_entry *parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811{
Takashi Iwai24c1f932005-11-17 13:58:48 +0100812 struct snd_info_entry *entry = snd_info_create_entry(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 if (entry) {
814 entry->module = module;
815 entry->parent = parent;
816 }
817 return entry;
818}
819
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200820EXPORT_SYMBOL(snd_info_create_module_entry);
821
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822/**
823 * snd_info_create_card_entry - create an info entry for the given card
824 * @card: the card instance
825 * @name: the file name
826 * @parent: the parent directory
827 *
828 * Creates a new info entry and assigns it to the given card.
829 *
830 * Returns the pointer of the new instance, or NULL on failure.
831 */
Takashi Iwai24c1f932005-11-17 13:58:48 +0100832struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 const char *name,
Takashi Iwai24c1f932005-11-17 13:58:48 +0100834 struct snd_info_entry * parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835{
Takashi Iwai24c1f932005-11-17 13:58:48 +0100836 struct snd_info_entry *entry = snd_info_create_entry(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 if (entry) {
838 entry->module = card->module;
839 entry->card = card;
840 entry->parent = parent;
841 }
842 return entry;
843}
844
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200845EXPORT_SYMBOL(snd_info_create_card_entry);
846
Takashi Iwai746d4a02006-06-23 14:37:59 +0200847static void snd_info_disconnect(struct snd_info_entry *entry)
848{
849 struct list_head *p, *n;
850 struct proc_dir_entry *root;
851
852 list_for_each_safe(p, n, &entry->children) {
853 snd_info_disconnect(list_entry(p, struct snd_info_entry, list));
854 }
855
856 if (! entry->p)
857 return;
858 list_del_init(&entry->list);
859 root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200860 snd_BUG_ON(!root);
Takashi Iwai746d4a02006-06-23 14:37:59 +0200861 snd_remove_proc_entry(root, entry->p);
862 entry->p = NULL;
863}
864
Takashi Iwai24c1f932005-11-17 13:58:48 +0100865static int snd_info_dev_free_entry(struct snd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866{
Takashi Iwai24c1f932005-11-17 13:58:48 +0100867 struct snd_info_entry *entry = device->device_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 snd_info_free_entry(entry);
869 return 0;
870}
871
Takashi Iwai24c1f932005-11-17 13:58:48 +0100872static int snd_info_dev_register_entry(struct snd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873{
Takashi Iwai24c1f932005-11-17 13:58:48 +0100874 struct snd_info_entry *entry = device->device_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 return snd_info_register(entry);
876}
877
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878/**
879 * snd_card_proc_new - create an info entry for the given card
880 * @card: the card instance
881 * @name: the file name
882 * @entryp: the pointer to store the new info entry
883 *
884 * Creates a new info entry and assigns it to the given card.
885 * Unlike snd_info_create_card_entry(), this function registers the
886 * info entry as an ALSA device component, so that it can be
887 * unregistered/released without explicit call.
888 * Also, you don't have to register this entry via snd_info_register(),
889 * since this will be registered by snd_card_register() automatically.
890 *
891 * The parent is assumed as card->proc_root.
892 *
893 * For releasing this entry, use snd_device_free() instead of
894 * snd_info_free_entry().
895 *
896 * Returns zero if successful, or a negative error code on failure.
897 */
Takashi Iwai24c1f932005-11-17 13:58:48 +0100898int snd_card_proc_new(struct snd_card *card, const char *name,
899 struct snd_info_entry **entryp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900{
Takashi Iwai24c1f932005-11-17 13:58:48 +0100901 static struct snd_device_ops ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 .dev_free = snd_info_dev_free_entry,
903 .dev_register = snd_info_dev_register_entry,
Takashi Iwai746d4a02006-06-23 14:37:59 +0200904 /* disconnect is done via snd_info_card_disconnect() */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 };
Takashi Iwai24c1f932005-11-17 13:58:48 +0100906 struct snd_info_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 int err;
908
909 entry = snd_info_create_card_entry(card, name, card->proc_root);
910 if (! entry)
911 return -ENOMEM;
912 if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) {
913 snd_info_free_entry(entry);
914 return err;
915 }
916 if (entryp)
917 *entryp = entry;
918 return 0;
919}
920
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200921EXPORT_SYMBOL(snd_card_proc_new);
922
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923/**
924 * snd_info_free_entry - release the info entry
925 * @entry: the info entry
926 *
927 * Releases the info entry. Don't call this after registered.
928 */
Takashi Iwai24c1f932005-11-17 13:58:48 +0100929void snd_info_free_entry(struct snd_info_entry * entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930{
931 if (entry == NULL)
932 return;
Takashi Iwai746d4a02006-06-23 14:37:59 +0200933 if (entry->p) {
934 mutex_lock(&info_mutex);
935 snd_info_disconnect(entry);
936 mutex_unlock(&info_mutex);
937 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 kfree(entry->name);
939 if (entry->private_free)
940 entry->private_free(entry);
941 kfree(entry);
942}
943
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200944EXPORT_SYMBOL(snd_info_free_entry);
945
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946/**
947 * snd_info_register - register the info entry
948 * @entry: the info entry
949 *
950 * Registers the proc info entry.
951 *
952 * Returns zero if successful, or a negative error code on failure.
953 */
Takashi Iwai24c1f932005-11-17 13:58:48 +0100954int snd_info_register(struct snd_info_entry * entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955{
956 struct proc_dir_entry *root, *p = NULL;
957
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200958 if (snd_BUG_ON(!entry))
959 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100961 mutex_lock(&info_mutex);
Alexey Dobriyan99b76232009-03-25 22:48:06 +0300962 p = create_proc_entry(entry->name, entry->mode, root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 if (!p) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100964 mutex_unlock(&info_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 return -ENOMEM;
966 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 if (!S_ISDIR(entry->mode))
968 p->proc_fops = &snd_info_entry_operations;
969 p->size = entry->size;
970 p->data = entry;
971 entry->p = p;
Takashi Iwai746d4a02006-06-23 14:37:59 +0200972 if (entry->parent)
973 list_add_tail(&entry->list, &entry->parent->children);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100974 mutex_unlock(&info_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 return 0;
976}
977
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200978EXPORT_SYMBOL(snd_info_register);
979
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980/*
981
982 */
983
Takashi Iwai6581f4e2006-05-17 17:14:51 +0200984static struct snd_info_entry *snd_info_version_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985
Takashi Iwai24c1f932005-11-17 13:58:48 +0100986static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987{
988 snd_iprintf(buffer,
989 "Advanced Linux Sound Architecture Driver Version "
990 CONFIG_SND_VERSION CONFIG_SND_DATE ".\n"
991 );
992}
993
994static int __init snd_info_version_init(void)
995{
Takashi Iwai24c1f932005-11-17 13:58:48 +0100996 struct snd_info_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997
998 entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL);
999 if (entry == NULL)
1000 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 entry->c.text.read = snd_info_version_read;
1002 if (snd_info_register(entry) < 0) {
1003 snd_info_free_entry(entry);
1004 return -ENOMEM;
1005 }
1006 snd_info_version_entry = entry;
1007 return 0;
1008}
1009
1010static int __exit snd_info_version_done(void)
1011{
Takashi Iwai746d4a02006-06-23 14:37:59 +02001012 snd_info_free_entry(snd_info_version_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 return 0;
1014}
1015
1016#endif /* CONFIG_PROC_FS */