info.c 23.1 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
/*
 *  Information interface for ALSA driver
 *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <sound/driver.h>
#include <linux/init.h>
#include <linux/time.h>
#include <linux/smp_lock.h>
26
#include <linux/string.h>
L
Linus Torvalds 已提交
27 28 29 30 31
#include <sound/core.h>
#include <sound/minors.h>
#include <sound/info.h>
#include <sound/version.h>
#include <linux/proc_fs.h>
32
#include <linux/mutex.h>
L
Linus Torvalds 已提交
33 34 35 36 37 38
#include <stdarg.h>

/*
 *
 */

39 40
#ifdef CONFIG_PROC_FS

L
Linus Torvalds 已提交
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69
int snd_info_check_reserved_words(const char *str)
{
	static char *reserved[] =
	{
		"version",
		"meminfo",
		"memdebug",
		"detect",
		"devices",
		"oss",
		"cards",
		"timers",
		"synth",
		"pcm",
		"seq",
		NULL
	};
	char **xstr = reserved;

	while (*xstr) {
		if (!strcmp(*xstr, str))
			return 0;
		xstr++;
	}
	if (!strncmp(str, "card", 4))
		return 0;
	return 1;
}

70
static DEFINE_MUTEX(info_mutex);
L
Linus Torvalds 已提交
71

72 73 74 75
struct snd_info_private_data {
	struct snd_info_buffer *rbuffer;
	struct snd_info_buffer *wbuffer;
	struct snd_info_entry *entry;
L
Linus Torvalds 已提交
76
	void *file_private_data;
77
};
L
Linus Torvalds 已提交
78 79 80 81 82

static int snd_info_version_init(void);
static int snd_info_version_done(void);


83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
/* resize the proc r/w buffer */
static int resize_info_buffer(struct snd_info_buffer *buffer,
			      unsigned int nsize)
{
	char *nbuf;

	nsize = PAGE_ALIGN(nsize);
	nbuf = kmalloc(nsize, GFP_KERNEL);
	if (! nbuf)
		return -ENOMEM;

	memcpy(nbuf, buffer->buffer, buffer->len);
	kfree(buffer->buffer);
	buffer->buffer = nbuf;
	buffer->len = nsize;
	return 0;
}

L
Linus Torvalds 已提交
101 102 103 104 105 106 107 108 109
/**
 * snd_iprintf - printf on the procfs buffer
 * @buffer: the procfs buffer
 * @fmt: the printf format
 *
 * Outputs the string on the procfs buffer just like printf().
 *
 * Returns the size of output string.
 */
110
int snd_iprintf(struct snd_info_buffer *buffer, char *fmt,...)
L
Linus Torvalds 已提交
111 112 113
{
	va_list args;
	int len, res;
114
	int err = 0;
L
Linus Torvalds 已提交
115

116
	might_sleep();
L
Linus Torvalds 已提交
117 118 119 120
	if (buffer->stop || buffer->error)
		return 0;
	len = buffer->len - buffer->size;
	va_start(args, fmt);
121 122 123 124 125 126 127 128
	for (;;) {
		res = vsnprintf(buffer->buffer + buffer->curr, len, fmt, args);
		if (res < len)
			break;
		err = resize_info_buffer(buffer, buffer->len + PAGE_SIZE);
		if (err < 0)
			break;
		len = buffer->len - buffer->size;
L
Linus Torvalds 已提交
129
	}
130 131 132 133
	va_end(args);

	if (err < 0)
		return err;
L
Linus Torvalds 已提交
134 135 136 137 138
	buffer->curr += res;
	buffer->size += res;
	return res;
}

139 140
EXPORT_SYMBOL(snd_iprintf);

L
Linus Torvalds 已提交
141 142 143 144
/*

 */

145 146
static struct proc_dir_entry *snd_proc_root;
struct snd_info_entry *snd_seq_root;
147 148
EXPORT_SYMBOL(snd_seq_root);

L
Linus Torvalds 已提交
149
#ifdef CONFIG_SND_OSSEMUL
150
struct snd_info_entry *snd_oss_root;
L
Linus Torvalds 已提交
151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166
#endif

static inline void snd_info_entry_prepare(struct proc_dir_entry *de)
{
	de->owner = THIS_MODULE;
}

static void snd_remove_proc_entry(struct proc_dir_entry *parent,
				  struct proc_dir_entry *de)
{
	if (de)
		remove_proc_entry(de->name, parent);
}

static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
{
167
	struct snd_info_private_data *data;
L
Linus Torvalds 已提交
168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208
	struct snd_info_entry *entry;
	loff_t ret;

	data = file->private_data;
	entry = data->entry;
	lock_kernel();
	switch (entry->content) {
	case SNDRV_INFO_CONTENT_TEXT:
		switch (orig) {
		case 0:	/* SEEK_SET */
			file->f_pos = offset;
			ret = file->f_pos;
			goto out;
		case 1:	/* SEEK_CUR */
			file->f_pos += offset;
			ret = file->f_pos;
			goto out;
		case 2:	/* SEEK_END */
		default:
			ret = -EINVAL;
			goto out;
		}
		break;
	case SNDRV_INFO_CONTENT_DATA:
		if (entry->c.ops->llseek) {
			ret = entry->c.ops->llseek(entry,
						    data->file_private_data,
						    file, offset, orig);
			goto out;
		}
		break;
	}
	ret = -ENXIO;
out:
	unlock_kernel();
	return ret;
}

static ssize_t snd_info_entry_read(struct file *file, char __user *buffer,
				   size_t count, loff_t * offset)
{
209
	struct snd_info_private_data *data;
L
Linus Torvalds 已提交
210
	struct snd_info_entry *entry;
211
	struct snd_info_buffer *buf;
L
Linus Torvalds 已提交
212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249
	size_t size = 0;
	loff_t pos;

	data = file->private_data;
	snd_assert(data != NULL, return -ENXIO);
	pos = *offset;
	if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
		return -EIO;
	if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
		return -EIO;
	entry = data->entry;
	switch (entry->content) {
	case SNDRV_INFO_CONTENT_TEXT:
		buf = data->rbuffer;
		if (buf == NULL)
			return -EIO;
		if (pos >= buf->size)
			return 0;
		size = buf->size - pos;
		size = min(count, size);
		if (copy_to_user(buffer, buf->buffer + pos, size))
			return -EFAULT;
		break;
	case SNDRV_INFO_CONTENT_DATA:
		if (entry->c.ops->read)
			size = entry->c.ops->read(entry,
						  data->file_private_data,
						  file, buffer, count, pos);
		break;
	}
	if ((ssize_t) size > 0)
		*offset = pos + size;
	return size;
}

static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer,
				    size_t count, loff_t * offset)
{
250
	struct snd_info_private_data *data;
L
Linus Torvalds 已提交
251
	struct snd_info_entry *entry;
252
	struct snd_info_buffer *buf;
253
	ssize_t size = 0;
L
Linus Torvalds 已提交
254 255 256 257 258 259 260 261 262 263 264 265 266 267 268
	loff_t pos;

	data = file->private_data;
	snd_assert(data != NULL, return -ENXIO);
	entry = data->entry;
	pos = *offset;
	if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
		return -EIO;
	if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
		return -EIO;
	switch (entry->content) {
	case SNDRV_INFO_CONTENT_TEXT:
		buf = data->wbuffer;
		if (buf == NULL)
			return -EIO;
C
Clemens Ladisch 已提交
269
		mutex_lock(&entry->access);
270 271 272 273 274 275 276 277
		if (pos + count >= buf->len) {
			if (resize_info_buffer(buf, pos + count)) {
				mutex_unlock(&entry->access);
				return -ENOMEM;
			}
		}
		if (copy_from_user(buf->buffer + pos, buffer, count)) {
			mutex_unlock(&entry->access);
L
Linus Torvalds 已提交
278
			return -EFAULT;
279 280 281 282
		}
		buf->size = pos + count;
		mutex_unlock(&entry->access);
		size = count;
L
Linus Torvalds 已提交
283 284 285 286 287 288 289 290 291 292 293 294 295 296 297
		break;
	case SNDRV_INFO_CONTENT_DATA:
		if (entry->c.ops->write)
			size = entry->c.ops->write(entry,
						   data->file_private_data,
						   file, buffer, count, pos);
		break;
	}
	if ((ssize_t) size > 0)
		*offset = pos + size;
	return size;
}

static int snd_info_entry_open(struct inode *inode, struct file *file)
{
298 299 300
	struct snd_info_entry *entry;
	struct snd_info_private_data *data;
	struct snd_info_buffer *buffer;
L
Linus Torvalds 已提交
301 302 303
	struct proc_dir_entry *p;
	int mode, err;

304
	mutex_lock(&info_mutex);
L
Linus Torvalds 已提交
305
	p = PDE(inode);
306
	entry = p == NULL ? NULL : (struct snd_info_entry *)p->data;
L
Linus Torvalds 已提交
307
	if (entry == NULL || entry->disconnected) {
308
		mutex_unlock(&info_mutex);
L
Linus Torvalds 已提交
309 310 311 312 313 314 315 316
		return -ENODEV;
	}
	if (!try_module_get(entry->module)) {
		err = -EFAULT;
		goto __error1;
	}
	mode = file->f_flags & O_ACCMODE;
	if (mode == O_RDONLY || mode == O_RDWR) {
317
		if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
L
Linus Torvalds 已提交
318 319 320 321 322 323
		     entry->c.ops->read == NULL)) {
		    	err = -ENODEV;
		    	goto __error;
		}
	}
	if (mode == O_WRONLY || mode == O_RDWR) {
324
		if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
L
Linus Torvalds 已提交
325 326 327 328 329
		     entry->c.ops->write == NULL)) {
		    	err = -ENODEV;
		    	goto __error;
		}
	}
330
	data = kzalloc(sizeof(*data), GFP_KERNEL);
L
Linus Torvalds 已提交
331 332 333 334 335 336 337 338
	if (data == NULL) {
		err = -ENOMEM;
		goto __error;
	}
	data->entry = entry;
	switch (entry->content) {
	case SNDRV_INFO_CONTENT_TEXT:
		if (mode == O_RDONLY || mode == O_RDWR) {
339
			buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
340 341
			if (buffer == NULL)
				goto __nomem;
L
Linus Torvalds 已提交
342
			data->rbuffer = buffer;
343 344 345 346
			buffer->len = PAGE_SIZE;
			buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
			if (buffer->buffer == NULL)
				goto __nomem;
L
Linus Torvalds 已提交
347 348
		}
		if (mode == O_WRONLY || mode == O_RDWR) {
349
			buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
350 351
			if (buffer == NULL)
				goto __nomem;
L
Linus Torvalds 已提交
352
			data->wbuffer = buffer;
353 354 355 356
			buffer->len = PAGE_SIZE;
			buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
			if (buffer->buffer == NULL)
				goto __nomem;
L
Linus Torvalds 已提交
357 358 359 360 361 362 363 364 365 366 367 368 369
		}
		break;
	case SNDRV_INFO_CONTENT_DATA:	/* data */
		if (entry->c.ops->open) {
			if ((err = entry->c.ops->open(entry, mode,
						      &data->file_private_data)) < 0) {
				kfree(data);
				goto __error;
			}
		}
		break;
	}
	file->private_data = data;
370
	mutex_unlock(&info_mutex);
L
Linus Torvalds 已提交
371 372 373
	if (entry->content == SNDRV_INFO_CONTENT_TEXT &&
	    (mode == O_RDONLY || mode == O_RDWR)) {
		if (entry->c.text.read) {
374
			mutex_lock(&entry->access);
L
Linus Torvalds 已提交
375
			entry->c.text.read(entry, data->rbuffer);
376
			mutex_unlock(&entry->access);
L
Linus Torvalds 已提交
377 378 379 380
		}
	}
	return 0;

381 382 383 384 385 386 387 388 389 390 391
 __nomem:
	if (data->rbuffer) {
		kfree(data->rbuffer->buffer);
		kfree(data->rbuffer);
	}
	if (data->wbuffer) {
		kfree(data->wbuffer->buffer);
		kfree(data->wbuffer);
	}
	kfree(data);
	err = -ENOMEM;
L
Linus Torvalds 已提交
392 393 394
      __error:
	module_put(entry->module);
      __error1:
395
	mutex_unlock(&info_mutex);
L
Linus Torvalds 已提交
396 397 398 399 400
	return err;
}

static int snd_info_entry_release(struct inode *inode, struct file *file)
{
401 402
	struct snd_info_entry *entry;
	struct snd_info_private_data *data;
L
Linus Torvalds 已提交
403 404 405 406 407 408 409
	int mode;

	mode = file->f_flags & O_ACCMODE;
	data = file->private_data;
	entry = data->entry;
	switch (entry->content) {
	case SNDRV_INFO_CONTENT_TEXT:
410 411
		if (data->rbuffer) {
			kfree(data->rbuffer->buffer);
L
Linus Torvalds 已提交
412 413
			kfree(data->rbuffer);
		}
414
		if (data->wbuffer) {
L
Linus Torvalds 已提交
415 416 417 418 419 420 421 422
			if (entry->c.text.write) {
				entry->c.text.write(entry, data->wbuffer);
				if (data->wbuffer->error) {
					snd_printk(KERN_WARNING "data write error to %s (%i)\n",
						entry->name,
						data->wbuffer->error);
				}
			}
423
			kfree(data->wbuffer->buffer);
L
Linus Torvalds 已提交
424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439
			kfree(data->wbuffer);
		}
		break;
	case SNDRV_INFO_CONTENT_DATA:
		if (entry->c.ops->release)
			entry->c.ops->release(entry, mode,
					      data->file_private_data);
		break;
	}
	module_put(entry->module);
	kfree(data);
	return 0;
}

static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait)
{
440
	struct snd_info_private_data *data;
L
Linus Torvalds 已提交
441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463
	struct snd_info_entry *entry;
	unsigned int mask;

	data = file->private_data;
	if (data == NULL)
		return 0;
	entry = data->entry;
	mask = 0;
	switch (entry->content) {
	case SNDRV_INFO_CONTENT_DATA:
		if (entry->c.ops->poll)
			return entry->c.ops->poll(entry,
						  data->file_private_data,
						  file, wait);
		if (entry->c.ops->read)
			mask |= POLLIN | POLLRDNORM;
		if (entry->c.ops->write)
			mask |= POLLOUT | POLLWRNORM;
		break;
	}
	return mask;
}

464 465
static long snd_info_entry_ioctl(struct file *file, unsigned int cmd,
				unsigned long arg)
L
Linus Torvalds 已提交
466
{
467
	struct snd_info_private_data *data;
L
Linus Torvalds 已提交
468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487
	struct snd_info_entry *entry;

	data = file->private_data;
	if (data == NULL)
		return 0;
	entry = data->entry;
	switch (entry->content) {
	case SNDRV_INFO_CONTENT_DATA:
		if (entry->c.ops->ioctl)
			return entry->c.ops->ioctl(entry,
						   data->file_private_data,
						   file, cmd, arg);
		break;
	}
	return -ENOTTY;
}

static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct inode *inode = file->f_dentry->d_inode;
488
	struct snd_info_private_data *data;
L
Linus Torvalds 已提交
489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507
	struct snd_info_entry *entry;

	data = file->private_data;
	if (data == NULL)
		return 0;
	entry = data->entry;
	switch (entry->content) {
	case SNDRV_INFO_CONTENT_DATA:
		if (entry->c.ops->mmap)
			return entry->c.ops->mmap(entry,
						  data->file_private_data,
						  inode, file, vma);
		break;
	}
	return -ENXIO;
}

static struct file_operations snd_info_entry_operations =
{
508 509 510 511 512 513 514 515 516
	.owner =		THIS_MODULE,
	.llseek =		snd_info_entry_llseek,
	.read =			snd_info_entry_read,
	.write =		snd_info_entry_write,
	.poll =			snd_info_entry_poll,
	.unlocked_ioctl =	snd_info_entry_ioctl,
	.mmap =			snd_info_entry_mmap,
	.open =			snd_info_entry_open,
	.release =		snd_info_entry_release,
L
Linus Torvalds 已提交
517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549
};

/**
 * snd_create_proc_entry - create a procfs entry
 * @name: the name of the proc file
 * @mode: the file permission bits, S_Ixxx
 * @parent: the parent proc-directory entry
 *
 * Creates a new proc file entry with the given name and permission
 * on the given directory.
 *
 * Returns the pointer of new instance or NULL on failure.
 */
static struct proc_dir_entry *snd_create_proc_entry(const char *name, mode_t mode,
						    struct proc_dir_entry *parent)
{
	struct proc_dir_entry *p;
	p = create_proc_entry(name, mode, parent);
	if (p)
		snd_info_entry_prepare(p);
	return p;
}

int __init snd_info_init(void)
{
	struct proc_dir_entry *p;

	p = snd_create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, &proc_root);
	if (p == NULL)
		return -ENOMEM;
	snd_proc_root = p;
#ifdef CONFIG_SND_OSSEMUL
	{
550
		struct snd_info_entry *entry;
L
Linus Torvalds 已提交
551 552 553 554 555 556 557 558 559 560 561 562
		if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL)
			return -ENOMEM;
		entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
		if (snd_info_register(entry) < 0) {
			snd_info_free_entry(entry);
			return -ENOMEM;
		}
		snd_oss_root = entry;
	}
#endif
#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
	{
563
		struct snd_info_entry *entry;
L
Linus Torvalds 已提交
564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588
		if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL)
			return -ENOMEM;
		entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
		if (snd_info_register(entry) < 0) {
			snd_info_free_entry(entry);
			return -ENOMEM;
		}
		snd_seq_root = entry;
	}
#endif
	snd_info_version_init();
	snd_minor_info_init();
	snd_minor_info_oss_init();
	snd_card_info_init();
	return 0;
}

int __exit snd_info_done(void)
{
	snd_card_info_done();
	snd_minor_info_oss_done();
	snd_minor_info_done();
	snd_info_version_done();
	if (snd_proc_root) {
#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
589
		snd_info_unregister(snd_seq_root);
L
Linus Torvalds 已提交
590 591
#endif
#ifdef CONFIG_SND_OSSEMUL
592
		snd_info_unregister(snd_oss_root);
L
Linus Torvalds 已提交
593 594 595 596 597 598 599 600 601 602 603 604 605 606 607
#endif
		snd_remove_proc_entry(&proc_root, snd_proc_root);
	}
	return 0;
}

/*

 */


/*
 * create a card proc file
 * called from init.c
 */
608
int snd_info_card_create(struct snd_card *card)
L
Linus Torvalds 已提交
609 610
{
	char str[8];
611
	struct snd_info_entry *entry;
L
Linus Torvalds 已提交
612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630

	snd_assert(card != NULL, return -ENXIO);

	sprintf(str, "card%i", card->number);
	if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL)
		return -ENOMEM;
	entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
	if (snd_info_register(entry) < 0) {
		snd_info_free_entry(entry);
		return -ENOMEM;
	}
	card->proc_root = entry;
	return 0;
}

/*
 * register the card proc file
 * called from init.c
 */
631
int snd_info_card_register(struct snd_card *card)
L
Linus Torvalds 已提交
632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650
{
	struct proc_dir_entry *p;

	snd_assert(card != NULL, return -ENXIO);

	if (!strcmp(card->id, card->proc_root->name))
		return 0;

	p = proc_symlink(card->id, snd_proc_root, card->proc_root->name);
	if (p == NULL)
		return -ENOMEM;
	card->proc_root_link = p;
	return 0;
}

/*
 * de-register the card proc file
 * called from init.c
 */
651
int snd_info_card_free(struct snd_card *card)
L
Linus Torvalds 已提交
652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675
{
	snd_assert(card != NULL, return -ENXIO);
	if (card->proc_root_link) {
		snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
		card->proc_root_link = NULL;
	}
	if (card->proc_root) {
		snd_info_unregister(card->proc_root);
		card->proc_root = NULL;
	}
	return 0;
}


/**
 * snd_info_get_line - read one line from the procfs buffer
 * @buffer: the procfs buffer
 * @line: the buffer to store
 * @len: the max. buffer size - 1
 *
 * Reads one line from the buffer and stores the string.
 *
 * Returns zero if successful, or 1 if error or EOF.
 */
676
int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len)
L
Linus Torvalds 已提交
677 678 679 680 681 682
{
	int c = -1;

	if (len <= 0 || buffer->stop || buffer->error)
		return 1;
	while (--len > 0) {
683
		c = buffer->buffer[buffer->curr++];
L
Linus Torvalds 已提交
684
		if (c == '\n') {
685
			if (buffer->curr >= buffer->size)
L
Linus Torvalds 已提交
686 687 688 689
				buffer->stop = 1;
			break;
		}
		*line++ = c;
690
		if (buffer->curr >= buffer->size) {
L
Linus Torvalds 已提交
691 692 693 694 695
			buffer->stop = 1;
			break;
		}
	}
	while (c != '\n' && !buffer->stop) {
696 697
		c = buffer->buffer[buffer->curr++];
		if (buffer->curr >= buffer->size)
L
Linus Torvalds 已提交
698 699 700 701 702 703
			buffer->stop = 1;
	}
	*line = '\0';
	return 0;
}

704 705
EXPORT_SYMBOL(snd_info_get_line);

L
Linus Torvalds 已提交
706
/**
707
 * snd_info_get_str - parse a string token
L
Linus Torvalds 已提交
708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741
 * @dest: the buffer to store the string token
 * @src: the original string
 * @len: the max. length of token - 1
 *
 * Parses the original string and copy a token to the given
 * string buffer.
 *
 * Returns the updated pointer of the original string so that
 * it can be used for the next call.
 */
char *snd_info_get_str(char *dest, char *src, int len)
{
	int c;

	while (*src == ' ' || *src == '\t')
		src++;
	if (*src == '"' || *src == '\'') {
		c = *src++;
		while (--len > 0 && *src && *src != c) {
			*dest++ = *src++;
		}
		if (*src == c)
			src++;
	} else {
		while (--len > 0 && *src && *src != ' ' && *src != '\t') {
			*dest++ = *src++;
		}
	}
	*dest = 0;
	while (*src == ' ' || *src == '\t')
		src++;
	return src;
}

742 743
EXPORT_SYMBOL(snd_info_get_str);

L
Linus Torvalds 已提交
744 745 746 747 748 749 750 751 752 753 754 755
/**
 * snd_info_create_entry - create an info entry
 * @name: the proc file name
 *
 * Creates an info entry with the given file name and initializes as
 * the default state.
 *
 * Usually called from other functions such as
 * snd_info_create_card_entry().
 *
 * Returns the pointer of the new instance, or NULL on failure.
 */
756
static struct snd_info_entry *snd_info_create_entry(const char *name)
L
Linus Torvalds 已提交
757
{
758
	struct snd_info_entry *entry;
759
	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
L
Linus Torvalds 已提交
760 761
	if (entry == NULL)
		return NULL;
762
	entry->name = kstrdup(name, GFP_KERNEL);
L
Linus Torvalds 已提交
763 764 765 766 767 768
	if (entry->name == NULL) {
		kfree(entry);
		return NULL;
	}
	entry->mode = S_IFREG | S_IRUGO;
	entry->content = SNDRV_INFO_CONTENT_TEXT;
769
	mutex_init(&entry->access);
L
Linus Torvalds 已提交
770 771 772 773 774 775 776 777 778 779 780 781 782
	return entry;
}

/**
 * snd_info_create_module_entry - create an info entry for the given module
 * @module: the module pointer
 * @name: the file name
 * @parent: the parent directory
 *
 * Creates a new info entry and assigns it to the given module.
 *
 * Returns the pointer of the new instance, or NULL on failure.
 */
783
struct snd_info_entry *snd_info_create_module_entry(struct module * module,
L
Linus Torvalds 已提交
784
					       const char *name,
785
					       struct snd_info_entry *parent)
L
Linus Torvalds 已提交
786
{
787
	struct snd_info_entry *entry = snd_info_create_entry(name);
L
Linus Torvalds 已提交
788 789 790 791 792 793 794
	if (entry) {
		entry->module = module;
		entry->parent = parent;
	}
	return entry;
}

795 796
EXPORT_SYMBOL(snd_info_create_module_entry);

L
Linus Torvalds 已提交
797 798 799 800 801 802 803 804 805 806
/**
 * snd_info_create_card_entry - create an info entry for the given card
 * @card: the card instance
 * @name: the file name
 * @parent: the parent directory
 *
 * Creates a new info entry and assigns it to the given card.
 *
 * Returns the pointer of the new instance, or NULL on failure.
 */
807
struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
L
Linus Torvalds 已提交
808
					     const char *name,
809
					     struct snd_info_entry * parent)
L
Linus Torvalds 已提交
810
{
811
	struct snd_info_entry *entry = snd_info_create_entry(name);
L
Linus Torvalds 已提交
812 813 814 815 816 817 818 819
	if (entry) {
		entry->module = card->module;
		entry->card = card;
		entry->parent = parent;
	}
	return entry;
}

820 821
EXPORT_SYMBOL(snd_info_create_card_entry);

822
static int snd_info_dev_free_entry(struct snd_device *device)
L
Linus Torvalds 已提交
823
{
824
	struct snd_info_entry *entry = device->device_data;
L
Linus Torvalds 已提交
825 826 827 828
	snd_info_free_entry(entry);
	return 0;
}

829
static int snd_info_dev_register_entry(struct snd_device *device)
L
Linus Torvalds 已提交
830
{
831
	struct snd_info_entry *entry = device->device_data;
L
Linus Torvalds 已提交
832 833 834
	return snd_info_register(entry);
}

835
static int snd_info_dev_disconnect_entry(struct snd_device *device)
L
Linus Torvalds 已提交
836
{
837
	struct snd_info_entry *entry = device->device_data;
L
Linus Torvalds 已提交
838 839 840 841
	entry->disconnected = 1;
	return 0;
}

842
static int snd_info_dev_unregister_entry(struct snd_device *device)
L
Linus Torvalds 已提交
843
{
844
	struct snd_info_entry *entry = device->device_data;
L
Linus Torvalds 已提交
845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867
	return snd_info_unregister(entry);
}

/**
 * snd_card_proc_new - create an info entry for the given card
 * @card: the card instance
 * @name: the file name
 * @entryp: the pointer to store the new info entry
 *
 * Creates a new info entry and assigns it to the given card.
 * Unlike snd_info_create_card_entry(), this function registers the
 * info entry as an ALSA device component, so that it can be
 * unregistered/released without explicit call.
 * Also, you don't have to register this entry via snd_info_register(),
 * since this will be registered by snd_card_register() automatically.
 *
 * The parent is assumed as card->proc_root.
 *
 * For releasing this entry, use snd_device_free() instead of
 * snd_info_free_entry(). 
 *
 * Returns zero if successful, or a negative error code on failure.
 */
868 869
int snd_card_proc_new(struct snd_card *card, const char *name,
		      struct snd_info_entry **entryp)
L
Linus Torvalds 已提交
870
{
871
	static struct snd_device_ops ops = {
L
Linus Torvalds 已提交
872 873 874 875 876
		.dev_free = snd_info_dev_free_entry,
		.dev_register =	snd_info_dev_register_entry,
		.dev_disconnect = snd_info_dev_disconnect_entry,
		.dev_unregister = snd_info_dev_unregister_entry
	};
877
	struct snd_info_entry *entry;
L
Linus Torvalds 已提交
878 879 880 881 882 883 884 885 886 887 888 889 890 891
	int err;

	entry = snd_info_create_card_entry(card, name, card->proc_root);
	if (! entry)
		return -ENOMEM;
	if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) {
		snd_info_free_entry(entry);
		return err;
	}
	if (entryp)
		*entryp = entry;
	return 0;
}

892 893
EXPORT_SYMBOL(snd_card_proc_new);

L
Linus Torvalds 已提交
894 895 896 897 898 899
/**
 * snd_info_free_entry - release the info entry
 * @entry: the info entry
 *
 * Releases the info entry.  Don't call this after registered.
 */
900
void snd_info_free_entry(struct snd_info_entry * entry)
L
Linus Torvalds 已提交
901 902 903 904 905 906 907 908 909
{
	if (entry == NULL)
		return;
	kfree(entry->name);
	if (entry->private_free)
		entry->private_free(entry);
	kfree(entry);
}

910 911
EXPORT_SYMBOL(snd_info_free_entry);

L
Linus Torvalds 已提交
912 913 914 915 916 917 918 919
/**
 * snd_info_register - register the info entry
 * @entry: the info entry
 *
 * Registers the proc info entry.
 *
 * Returns zero if successful, or a negative error code on failure.
 */
920
int snd_info_register(struct snd_info_entry * entry)
L
Linus Torvalds 已提交
921 922 923 924 925
{
	struct proc_dir_entry *root, *p = NULL;

	snd_assert(entry != NULL, return -ENXIO);
	root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
926
	mutex_lock(&info_mutex);
L
Linus Torvalds 已提交
927 928
	p = snd_create_proc_entry(entry->name, entry->mode, root);
	if (!p) {
929
		mutex_unlock(&info_mutex);
L
Linus Torvalds 已提交
930 931 932 933 934 935 936 937
		return -ENOMEM;
	}
	p->owner = entry->module;
	if (!S_ISDIR(entry->mode))
		p->proc_fops = &snd_info_entry_operations;
	p->size = entry->size;
	p->data = entry;
	entry->p = p;
938
	mutex_unlock(&info_mutex);
L
Linus Torvalds 已提交
939 940 941
	return 0;
}

942 943
EXPORT_SYMBOL(snd_info_register);

L
Linus Torvalds 已提交
944 945 946 947 948 949 950 951
/**
 * snd_info_unregister - de-register the info entry
 * @entry: the info entry
 *
 * De-registers the info entry and releases the instance.
 *
 * Returns zero if successful, or a negative error code on failure.
 */
952
int snd_info_unregister(struct snd_info_entry * entry)
L
Linus Torvalds 已提交
953 954 955
{
	struct proc_dir_entry *root;

956 957
	if (! entry)
		return 0;
958
	snd_assert(entry->p != NULL, return -ENXIO);
L
Linus Torvalds 已提交
959 960
	root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
	snd_assert(root, return -ENXIO);
961
	mutex_lock(&info_mutex);
L
Linus Torvalds 已提交
962
	snd_remove_proc_entry(root, entry->p);
963
	mutex_unlock(&info_mutex);
L
Linus Torvalds 已提交
964 965 966 967
	snd_info_free_entry(entry);
	return 0;
}

968 969
EXPORT_SYMBOL(snd_info_unregister);

L
Linus Torvalds 已提交
970 971 972 973
/*

 */

974
static struct snd_info_entry *snd_info_version_entry;
L
Linus Torvalds 已提交
975

976
static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
L
Linus Torvalds 已提交
977 978 979 980 981 982 983 984 985
{
	snd_iprintf(buffer,
		    "Advanced Linux Sound Architecture Driver Version "
		    CONFIG_SND_VERSION CONFIG_SND_DATE ".\n"
		   );
}

static int __init snd_info_version_init(void)
{
986
	struct snd_info_entry *entry;
L
Linus Torvalds 已提交
987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007

	entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL);
	if (entry == NULL)
		return -ENOMEM;
	entry->c.text.read = snd_info_version_read;
	if (snd_info_register(entry) < 0) {
		snd_info_free_entry(entry);
		return -ENOMEM;
	}
	snd_info_version_entry = entry;
	return 0;
}

static int __exit snd_info_version_done(void)
{
	if (snd_info_version_entry)
		snd_info_unregister(snd_info_version_entry);
	return 0;
}

#endif /* CONFIG_PROC_FS */