linux/sound/core/info.c
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   1/*
   2 *  Information interface for ALSA driver
   3 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   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
  22#include <linux/init.h>
  23#include <linux/time.h>
  24#include <linux/mm.h>
  25#include <linux/slab.h>
  26#include <linux/string.h>
  27#include <linux/module.h>
  28#include <sound/core.h>
  29#include <sound/minors.h>
  30#include <sound/info.h>
  31#include <linux/utsname.h>
  32#include <linux/proc_fs.h>
  33#include <linux/mutex.h>
  34#include <stdarg.h>
  35
  36/*
  37 *
  38 */
  39
  40#ifdef CONFIG_PROC_FS
  41
  42int 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
  71static DEFINE_MUTEX(info_mutex);
  72
  73struct snd_info_private_data {
  74        struct snd_info_buffer *rbuffer;
  75        struct snd_info_buffer *wbuffer;
  76        struct snd_info_entry *entry;
  77        void *file_private_data;
  78};
  79
  80static int snd_info_version_init(void);
  81static int snd_info_version_done(void);
  82static void snd_info_disconnect(struct snd_info_entry *entry);
  83
  84
  85/* 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);
  92        nbuf = krealloc(buffer->buffer, nsize, GFP_KERNEL);
  93        if (! nbuf)
  94                return -ENOMEM;
  95
  96        buffer->buffer = nbuf;
  97        buffer->len = nsize;
  98        return 0;
  99}
 100
 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 */
 110int snd_iprintf(struct snd_info_buffer *buffer, const char *fmt, ...)
 111{
 112        va_list args;
 113        int len, res;
 114        int err = 0;
 115
 116        might_sleep();
 117        if (buffer->stop || buffer->error)
 118                return 0;
 119        len = buffer->len - buffer->size;
 120        va_start(args, fmt);
 121        for (;;) {
 122                va_list ap;
 123                va_copy(ap, args);
 124                res = vsnprintf(buffer->buffer + buffer->curr, len, fmt, ap);
 125                va_end(ap);
 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;
 132        }
 133        va_end(args);
 134
 135        if (err < 0)
 136                return err;
 137        buffer->curr += res;
 138        buffer->size += res;
 139        return res;
 140}
 141
 142EXPORT_SYMBOL(snd_iprintf);
 143
 144/*
 145
 146 */
 147
 148static struct proc_dir_entry *snd_proc_root;
 149struct snd_info_entry *snd_seq_root;
 150EXPORT_SYMBOL(snd_seq_root);
 151
 152#ifdef CONFIG_SND_OSSEMUL
 153struct snd_info_entry *snd_oss_root;
 154#endif
 155
 156static 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{
 165        struct snd_info_private_data *data;
 166        struct snd_info_entry *entry;
 167        loff_t ret = -EINVAL, size;
 168
 169        data = file->private_data;
 170        entry = data->entry;
 171        mutex_lock(&entry->access);
 172        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;
 178        }
 179        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:
 204        mutex_unlock(&entry->access);
 205        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{
 211        struct snd_info_private_data *data;
 212        struct snd_info_entry *entry;
 213        struct snd_info_buffer *buf;
 214        size_t size = 0;
 215        loff_t pos;
 216
 217        data = file->private_data;
 218        if (snd_BUG_ON(!data))
 219                return -ENXIO;
 220        pos = *offset;
 221        if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
 222                return -EIO;
 223        if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
 224                return -EIO;
 225        entry = data->entry;
 226        switch (entry->content) {
 227        case SNDRV_INFO_CONTENT_TEXT:
 228                buf = data->rbuffer;
 229                if (buf == NULL)
 230                        return -EIO;
 231                if (pos >= buf->size)
 232                        return 0;
 233                size = buf->size - pos;
 234                size = min(count, size);
 235                if (copy_to_user(buffer, buf->buffer + pos, size))
 236                        return -EFAULT;
 237                break;
 238        case SNDRV_INFO_CONTENT_DATA:
 239                if (pos >= entry->size)
 240                        return 0;
 241                if (entry->c.ops->read) {
 242                        size = entry->size - pos;
 243                        size = min(count, size);
 244                        size = entry->c.ops->read(entry,
 245                                                  data->file_private_data,
 246                                                  file, buffer, size, pos);
 247                }
 248                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{
 258        struct snd_info_private_data *data;
 259        struct snd_info_entry *entry;
 260        struct snd_info_buffer *buf;
 261        ssize_t size = 0;
 262        loff_t pos;
 263
 264        data = file->private_data;
 265        if (snd_BUG_ON(!data))
 266                return -ENXIO;
 267        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;
 278                mutex_lock(&entry->access);
 279                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);
 287                        return -EFAULT;
 288                }
 289                buf->size = pos + count;
 290                mutex_unlock(&entry->access);
 291                size = count;
 292                break;
 293        case SNDRV_INFO_CONTENT_DATA:
 294                if (entry->c.ops->write && count > 0) {
 295                        size_t maxsize = entry->size - pos;
 296                        count = min(count, maxsize);
 297                        size = entry->c.ops->write(entry,
 298                                                   data->file_private_data,
 299                                                   file, buffer, count, pos);
 300                }
 301                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{
 310        struct snd_info_entry *entry;
 311        struct snd_info_private_data *data;
 312        struct snd_info_buffer *buffer;
 313        struct proc_dir_entry *p;
 314        int mode, err;
 315
 316        mutex_lock(&info_mutex);
 317        p = PDE(inode);
 318        entry = p == NULL ? NULL : (struct snd_info_entry *)p->data;
 319        if (entry == NULL || ! entry->p) {
 320                mutex_unlock(&info_mutex);
 321                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) {
 329                if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
 330                     entry->c.ops->read == NULL)) {
 331                        err = -ENODEV;
 332                        goto __error;
 333                }
 334        }
 335        if (mode == O_WRONLY || mode == O_RDWR) {
 336                if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
 337                     entry->c.ops->write == NULL)) {
 338                        err = -ENODEV;
 339                        goto __error;
 340                }
 341        }
 342        data = kzalloc(sizeof(*data), GFP_KERNEL);
 343        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) {
 351                        buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
 352                        if (buffer == NULL)
 353                                goto __nomem;
 354                        data->rbuffer = buffer;
 355                        buffer->len = PAGE_SIZE;
 356                        buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
 357                        if (buffer->buffer == NULL)
 358                                goto __nomem;
 359                }
 360                if (mode == O_WRONLY || mode == O_RDWR) {
 361                        buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
 362                        if (buffer == NULL)
 363                                goto __nomem;
 364                        data->wbuffer = buffer;
 365                        buffer->len = PAGE_SIZE;
 366                        buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
 367                        if (buffer->buffer == NULL)
 368                                goto __nomem;
 369                }
 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;
 382        mutex_unlock(&info_mutex);
 383        if (entry->content == SNDRV_INFO_CONTENT_TEXT &&
 384            (mode == O_RDONLY || mode == O_RDWR)) {
 385                if (entry->c.text.read) {
 386                        mutex_lock(&entry->access);
 387                        entry->c.text.read(entry, data->rbuffer);
 388                        mutex_unlock(&entry->access);
 389                }
 390        }
 391        return 0;
 392
 393 __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;
 404      __error:
 405        module_put(entry->module);
 406      __error1:
 407        mutex_unlock(&info_mutex);
 408        return err;
 409}
 410
 411static int snd_info_entry_release(struct inode *inode, struct file *file)
 412{
 413        struct snd_info_entry *entry;
 414        struct snd_info_private_data *data;
 415        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:
 422                if (data->rbuffer) {
 423                        kfree(data->rbuffer->buffer);
 424                        kfree(data->rbuffer);
 425                }
 426                if (data->wbuffer) {
 427                        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                        }
 435                        kfree(data->wbuffer->buffer);
 436                        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{
 452        struct snd_info_private_data *data;
 453        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
 476static long snd_info_entry_ioctl(struct file *file, unsigned int cmd,
 477                                unsigned long arg)
 478{
 479        struct snd_info_private_data *data;
 480        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
 497static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma)
 498{
 499        struct inode *inode = file->f_path.dentry->d_inode;
 500        struct snd_info_private_data *data;
 501        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
 518static const struct file_operations snd_info_entry_operations =
 519{
 520        .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,
 529};
 530
 531int __init snd_info_init(void)
 532{
 533        struct proc_dir_entry *p;
 534
 535        p = proc_mkdir("asound", NULL);
 536        if (p == NULL)
 537                return -ENOMEM;
 538        snd_proc_root = p;
 539#ifdef CONFIG_SND_OSSEMUL
 540        {
 541                struct snd_info_entry *entry;
 542                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        {
 554                struct snd_info_entry *entry;
 555                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();
 566        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();
 577        snd_info_version_done();
 578        if (snd_proc_root) {
 579#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
 580                snd_info_free_entry(snd_seq_root);
 581#endif
 582#ifdef CONFIG_SND_OSSEMUL
 583                snd_info_free_entry(snd_oss_root);
 584#endif
 585                snd_remove_proc_entry(NULL, snd_proc_root);
 586        }
 587        return 0;
 588}
 589
 590/*
 591
 592 */
 593
 594
 595/*
 596 * create a card proc file
 597 * called from init.c
 598 */
 599int snd_info_card_create(struct snd_card *card)
 600{
 601        char str[8];
 602        struct snd_info_entry *entry;
 603
 604        if (snd_BUG_ON(!card))
 605                return -ENXIO;
 606
 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 */
 623int snd_info_card_register(struct snd_card *card)
 624{
 625        struct proc_dir_entry *p;
 626
 627        if (snd_BUG_ON(!card))
 628                return -ENXIO;
 629
 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/*
 641 * 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/*
 658 * de-register the card proc file
 659 * called from init.c
 660 */
 661void snd_info_card_disconnect(struct snd_card *card)
 662{
 663        if (!card)
 664                return;
 665        mutex_lock(&info_mutex);
 666        if (card->proc_root_link) {
 667                snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
 668                card->proc_root_link = NULL;
 669        }
 670        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{
 681        if (!card)
 682                return 0;
 683        snd_info_free_entry(card->proc_root);
 684        card->proc_root = NULL;
 685        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 */
 699int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len)
 700{
 701        int c = -1;
 702
 703        if (len <= 0 || buffer->stop || buffer->error)
 704                return 1;
 705        while (--len > 0) {
 706                c = buffer->buffer[buffer->curr++];
 707                if (c == '\n') {
 708                        if (buffer->curr >= buffer->size)
 709                                buffer->stop = 1;
 710                        break;
 711                }
 712                *line++ = c;
 713                if (buffer->curr >= buffer->size) {
 714                        buffer->stop = 1;
 715                        break;
 716                }
 717        }
 718        while (c != '\n' && !buffer->stop) {
 719                c = buffer->buffer[buffer->curr++];
 720                if (buffer->curr >= buffer->size)
 721                        buffer->stop = 1;
 722        }
 723        *line = '\0';
 724        return 0;
 725}
 726
 727EXPORT_SYMBOL(snd_info_get_line);
 728
 729/**
 730 * snd_info_get_str - parse a string token
 731 * @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 */
 741const char *snd_info_get_str(char *dest, const char *src, int len)
 742{
 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
 765EXPORT_SYMBOL(snd_info_get_str);
 766
 767/**
 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 */
 779static struct snd_info_entry *snd_info_create_entry(const char *name)
 780{
 781        struct snd_info_entry *entry;
 782        entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 783        if (entry == NULL)
 784                return NULL;
 785        entry->name = kstrdup(name, GFP_KERNEL);
 786        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;
 792        mutex_init(&entry->access);
 793        INIT_LIST_HEAD(&entry->children);
 794        INIT_LIST_HEAD(&entry->list);
 795        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 */
 808struct snd_info_entry *snd_info_create_module_entry(struct module * module,
 809                                               const char *name,
 810                                               struct snd_info_entry *parent)
 811{
 812        struct snd_info_entry *entry = snd_info_create_entry(name);
 813        if (entry) {
 814                entry->module = module;
 815                entry->parent = parent;
 816        }
 817        return entry;
 818}
 819
 820EXPORT_SYMBOL(snd_info_create_module_entry);
 821
 822/**
 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 */
 832struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
 833                                             const char *name,
 834                                             struct snd_info_entry * parent)
 835{
 836        struct snd_info_entry *entry = snd_info_create_entry(name);
 837        if (entry) {
 838                entry->module = card->module;
 839                entry->card = card;
 840                entry->parent = parent;
 841        }
 842        return entry;
 843}
 844
 845EXPORT_SYMBOL(snd_info_create_card_entry);
 846
 847static 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;
 860        snd_BUG_ON(!root);
 861        snd_remove_proc_entry(root, entry->p);
 862        entry->p = NULL;
 863}
 864
 865static int snd_info_dev_free_entry(struct snd_device *device)
 866{
 867        struct snd_info_entry *entry = device->device_data;
 868        snd_info_free_entry(entry);
 869        return 0;
 870}
 871
 872static int snd_info_dev_register_entry(struct snd_device *device)
 873{
 874        struct snd_info_entry *entry = device->device_data;
 875        return snd_info_register(entry);
 876}
 877
 878/**
 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 */
 898int snd_card_proc_new(struct snd_card *card, const char *name,
 899                      struct snd_info_entry **entryp)
 900{
 901        static struct snd_device_ops ops = {
 902                .dev_free = snd_info_dev_free_entry,
 903                .dev_register = snd_info_dev_register_entry,
 904                /* disconnect is done via snd_info_card_disconnect() */
 905        };
 906        struct snd_info_entry *entry;
 907        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
 921EXPORT_SYMBOL(snd_card_proc_new);
 922
 923/**
 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 */
 929void snd_info_free_entry(struct snd_info_entry * entry)
 930{
 931        if (entry == NULL)
 932                return;
 933        if (entry->p) {
 934                mutex_lock(&info_mutex);
 935                snd_info_disconnect(entry);
 936                mutex_unlock(&info_mutex);
 937        }
 938        kfree(entry->name);
 939        if (entry->private_free)
 940                entry->private_free(entry);
 941        kfree(entry);
 942}
 943
 944EXPORT_SYMBOL(snd_info_free_entry);
 945
 946/**
 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 */
 954int snd_info_register(struct snd_info_entry * entry)
 955{
 956        struct proc_dir_entry *root, *p = NULL;
 957
 958        if (snd_BUG_ON(!entry))
 959                return -ENXIO;
 960        root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
 961        mutex_lock(&info_mutex);
 962        p = create_proc_entry(entry->name, entry->mode, root);
 963        if (!p) {
 964                mutex_unlock(&info_mutex);
 965                return -ENOMEM;
 966        }
 967        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;
 972        if (entry->parent)
 973                list_add_tail(&entry->list, &entry->parent->children);
 974        mutex_unlock(&info_mutex);
 975        return 0;
 976}
 977
 978EXPORT_SYMBOL(snd_info_register);
 979
 980/*
 981
 982 */
 983
 984static struct snd_info_entry *snd_info_version_entry;
 985
 986static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
 987{
 988        snd_iprintf(buffer,
 989                    "Advanced Linux Sound Architecture Driver Version k%s.\n",
 990                    init_utsname()->release);
 991}
 992
 993static int __init snd_info_version_init(void)
 994{
 995        struct snd_info_entry *entry;
 996
 997        entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL);
 998        if (entry == NULL)
 999                return -ENOMEM;
1000        entry->c.text.read = snd_info_version_read;
1001        if (snd_info_register(entry) < 0) {
1002                snd_info_free_entry(entry);
1003                return -ENOMEM;
1004        }
1005        snd_info_version_entry = entry;
1006        return 0;
1007}
1008
1009static int __exit snd_info_version_done(void)
1010{
1011        snd_info_free_entry(snd_info_version_entry);
1012        return 0;
1013}
1014
1015#endif /* CONFIG_PROC_FS */
1016
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