namedev.c

   1 /*
   2  * namedev.c
   3  *
   4  * Userspace devfs
   5  *
   6  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   7  *
   8  *
   9  *      This program is free software; you can redistribute it and/or modify it
  10  *      under the terms of the GNU General Public License as published by the
  11  *      Free Software Foundation version 2 of the License.
  12  *
  13  *      This program is distributed in the hope that it will be useful, but
  14  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *      General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License along
  19  *      with this program; if not, write to the Free Software Foundation, Inc.,
  20  *      675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  */
  23
  24 #include <stddef.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <stdio.h>
  28 #include <fcntl.h>
  29 #include <ctype.h>
  30 #include <unistd.h>
  31 #include <errno.h>
  32 #include <time.h>
  33 #include <sys/wait.h>
  34 #include <sys/stat.h>
  35
  36 #include "list.h"
  37 #include "udev.h"
  38 #include "udev_version.h"
  39 #include "logging.h"
  40 #include "namedev.h"
  41 #include "libsysfs/libsysfs.h"
  42 #include "klibc_fixups.h"
  43
  44 LIST_HEAD(config_device_list);
  45 LIST_HEAD(perm_device_list);
  46
  47 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  48 static int strcmp_pattern(const char *p, const char *s)
  49 {
  50         if (*s == '\0') {
  51                 while (*p == '*')
  52                         p++;
  53                 return (*p != '\0');
  54         }
  55         switch (*p) {
  56         case '[':
  57                 {
  58                         int not = 0;
  59                         p++;
  60                         if (*p == '!') {
  61                                 not = 1;
  62                                 p++;
  63                         }
  64                         while (*p && (*p != ']')) {
  65                                 int match = 0;
  66                                 if (p[1] == '-') {
  67                                         if ((*s >= *p) && (*s <= p[2]))
  68                                                 match = 1;
  69                                         p += 3;
  70                                 } else {
  71                                         match = (*p == *s);
  72                                         p++;
  73                                 }
  74                                 if (match ^ not) {
  75                                         while (*p && (*p != ']'))
  76                                                 p++;
  77                                         return strcmp_pattern(p+1, s+1);
  78                                 }
  79                         }
  80                 }
  81                 break;
  82         case '*':
  83                 if (strcmp_pattern(p, s+1))
  84                         return strcmp_pattern(p+1, s);
  85                 return 0;
  86         case '\0':
  87                 if (*s == '\0') {
  88                         return 0;
  89                 }
  90                 break;
  91         default:
  92                 if ((*p == *s) || (*p == '?'))
  93                         return strcmp_pattern(p+1, s+1);
  94                 break;
  95         }
  96         return 1;
  97 }
  98
  99 #define copy_var(a, b, var)             \
 100         if (b->var)                     \
 101                 a->var = b->var;
 102
 103 #define copy_string(a, b, var)          \
 104         if (strlen(b->var))             \
 105                 strcpy(a->var, b->var);
 106
 107 int add_perm_dev(struct perm_device *new_dev)
 108 {
 109         struct perm_device *dev;
 110         struct perm_device *tmp_dev;
 111
 112         /* update the values if we already have the device */
 113         list_for_each_entry(dev, &perm_device_list, node) {
 114                 if (strcmp_pattern(new_dev->name, dev->name))
 115                         continue;
 116                 copy_var(dev, new_dev, mode);
 117                 copy_string(dev, new_dev, owner);
 118                 copy_string(dev, new_dev, group);
 119                 return 0;
 120         }
 121
 122         /* not found, add new structure to the perm list */
 123         tmp_dev = malloc(sizeof(*tmp_dev));
 124         if (!tmp_dev)
 125                 return -ENOMEM;
 126         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 127         list_add_tail(&tmp_dev->node, &perm_device_list);
 128         //dump_perm_dev(tmp_dev);
 129         return 0;
 130 }
 131
 132 static struct perm_device *find_perm(char *name)
 133 {
 134         struct perm_device *perm;
 135
 136         list_for_each_entry(perm, &perm_device_list, node) {
 137                 if (strcmp_pattern(perm->name, name))
 138                         continue;
 139                 return perm;
 140         }
 141         return NULL;
 142 }
 143
 144 static mode_t get_default_mode(void)
 145 {
 146         mode_t mode = 0600;     /* default to owner rw only */
 147
 148         if (strlen(default_mode_str) != 0)
 149                 mode = strtol(default_mode_str, NULL, 8);
 150
 151         return mode;
 152 }
 153
 154 static char *get_default_owner(void)
 155 {
 156         if (strlen(default_owner_str) == 0)
 157                 strncpy(default_owner_str, "root", OWNER_SIZE);
 158
 159         return default_owner_str;
 160 }
 161
 162 static char *get_default_group(void)
 163 {
 164         if (strlen(default_group_str) == 0)
 165                 strncpy(default_group_str, "root", GROUP_SIZE);
 166
 167         return default_group_str;
 168 }
 169
 170 static void apply_format(struct udevice *udev, unsigned char *string)
 171 {
 172         char temp[NAME_SIZE];
 173         char temp1[NAME_SIZE];
 174         char *tail;
 175         char *pos;
 176         char *pos2;
 177         char *pos3;
 178         int num;
 179
 180         pos = string;
 181         while (1) {
 182                 num = 0;
 183                 pos = strchr(pos, '%');
 184
 185                 if (pos) {
 186                         pos[0] = '\0';
 187                         tail = pos+1;
 188                         if (isdigit(tail[0])) {
 189                                 num = (int) strtoul(&pos[1], &tail, 10);
 190                                 if (tail == NULL) {
 191                                         dbg("format parsing error '%s'", pos+1);
 192                                         break;
 193                                 }
 194                         }
 195                         strfieldcpy(temp, tail+1);
 196
 197                         switch (tail[0]) {
 198                         case 'b':
 199                                 if (strlen(udev->bus_id) == 0)
 200                                         break;
 201                                 strcat(pos, udev->bus_id);
 202                                 dbg("substitute bus_id '%s'", udev->bus_id);
 203                                 break;
 204                         case 'k':
 205                                 if (strlen(udev->kernel_name) == 0)
 206                                         break;
 207                                 strcat(pos, udev->kernel_name);
 208                                 dbg("substitute kernel name '%s'", udev->kernel_name);
 209                                 break;
 210                         case 'n':
 211                                 if (strlen(udev->kernel_number) == 0)
 212                                         break;
 213                                 strcat(pos, udev->kernel_number);
 214                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 215                                 break;
 216                         case 'm':
 217                                 sprintf(pos, "%u", udev->minor);
 218                                 dbg("substitute minor number '%u'", udev->minor);
 219                                 break;
 220                         case 'M':
 221                                 sprintf(pos, "%u", udev->major);
 222                                 dbg("substitute major number '%u'", udev->major);
 223                                 break;
 224                         case 'c':
 225                                 if (strlen(udev->program_result) == 0)
 226                                         break;
 227                                 if (num) {
 228                                         /* get part of return string */
 229                                         strncpy(temp1, udev->program_result, sizeof(temp1));
 230                                         pos2 = temp1;
 231                                         while (num) {
 232                                                 num--;
 233                                                 pos3 = strsep(&pos2, " ");
 234                                                 if (pos3 == NULL) {
 235                                                         dbg("requested part of result string not found");
 236                                                         break;
 237                                                 }
 238                                         }
 239                                         if (pos3) {
 240                                                 strcat(pos, pos3);
 241                                                 dbg("substitute part of result string '%s'", pos3);
 242                                         }
 243                                 } else {
 244                                         strcat(pos, udev->program_result);
 245                                         dbg("substitute result string '%s'", udev->program_result);
 246                                 }
 247                                 break;
 248                         case '%':
 249                                 strcat(pos, "%");
 250                                 pos++;
 251                                 break;
 252                         default:
 253                                 dbg("unknown substitution type '%%%c'", pos[1]);
 254                                 break;
 255                         }
 256                         strcat(string, temp);
 257                 } else
 258                         break;
 259         }
 260 }
 261
 262 static struct bus_file {
 263         char *bus;
 264         char *file;
 265 } bus_files[] = {
 266         { .bus = "scsi",        .file = "vendor" },
 267         { .bus = "usb",         .file = "idVendor" },
 268         { .bus = "usb-serial",  .file = "detach_state" },
 269         { .bus = "ide",         .file = "detach_state" },
 270         { .bus = "pci",         .file = "vendor" },
 271         {}
 272 };
 273
 274 #define SECONDS_TO_WAIT_FOR_FILE        10
 275 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
 276 {
 277         /* sleep until we see the file for this specific bus type show up this
 278          * is needed because we can easily out-run the kernel in looking for
 279          * these files before the paticular subsystem has created them in the
 280          * sysfs tree properly.
 281          *
 282          * And people thought that the /sbin/hotplug event system was going to
 283          * be slow, poo on you for arguing that before even testing it...
 284          */
 285         struct bus_file *b = &bus_files[0];
 286         struct sysfs_attribute *tmpattr;
 287         int loop;
 288
 289         while (1) {
 290                 if (b->bus == NULL)
 291                         break;
 292                 if (strcmp(sysfs_device->bus, b->bus) == 0) {
 293                         tmpattr = NULL;
 294                         loop = SECONDS_TO_WAIT_FOR_FILE;
 295                         while (loop--) {
 296                                 dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
 297                                 tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
 298                                 if (tmpattr) {
 299                                         /* found it! */
 300                                         goto exit;
 301                                 }
 302                                 /* sleep to give the kernel a chance to create the file */
 303                                 sleep(1);
 304                         }
 305                         dbg("timed out waiting for '%s' file, continuing on anyway...", b->file);
 306                         goto exit;
 307                 }
 308                 b++;
 309         }
 310         dbg("did not find bus type '%s' on list of bus_id_files, contact greg@kroah.com", sysfs_device->bus);
 311 exit:
 312         return; /* here to prevent compiler warning... */
 313 }
 314
 315 static int execute_program(char *path, char *value, int len)
 316 {
 317         int retval;
 318         int res;
 319         int status;
 320         int fds[2];
 321         pid_t pid;
 322         int value_set = 0;
 323         char buffer[256];
 324         char *pos;
 325         char *args[PROGRAM_MAXARG];
 326         int i;
 327
 328         dbg("executing '%s'", path);
 329         retval = pipe(fds);
 330         if (retval != 0) {
 331                 dbg("pipe failed");
 332                 return -1;
 333         }
 334         pid = fork();
 335         if (pid == -1) {
 336                 dbg("fork failed");
 337                 return -1;
 338         }
 339
 340         if (pid == 0) {
 341                 /* child */
 342                 close(STDOUT_FILENO);
 343                 dup(fds[1]);    /* dup write side of pipe to STDOUT */
 344                 if (strchr(path, ' ')) {
 345                         /* exec with arguments */
 346                         pos = path;
 347                         for (i=0; i < PROGRAM_MAXARG-1; i++) {
 348                                 args[i] = strsep(&pos, " ");
 349                                 if (args[i] == NULL)
 350                                         break;
 351                         }
 352                         if (args[i]) {
 353                                 dbg("too many args - %d", i);
 354                                 args[i] = NULL;
 355                         }
 356                         retval = execve(args[0], args, main_envp);
 357                 } else {
 358                         retval = execve(path, main_argv, main_envp);
 359                 }
 360                 if (retval != 0) {
 361                         dbg("child execve failed");
 362                         exit(1);
 363                 }
 364                 return -1; /* avoid compiler warning */
 365         } else {
 366                 /* parent reads from fds[0] */
 367                 close(fds[1]);
 368                 retval = 0;
 369                 while (1) {
 370                         res = read(fds[0], buffer, sizeof(buffer) - 1);
 371                         if (res <= 0)
 372                                 break;
 373                         buffer[res] = '\0';
 374                         if (res > len) {
 375                                 dbg("result len %d too short", len);
 376                                 retval = -1;
 377                         }
 378                         if (value_set) {
 379                                 dbg("result value already set");
 380                                 retval = -1;
 381                         } else {
 382                                 value_set = 1;
 383                                 strncpy(value, buffer, len);
 384                                 pos = value + strlen(value)-1;
 385                                 if (pos[0] == '\n')
 386                                 pos[0] = '\0';
 387                                 dbg("result is '%s'", value);
 388                         }
 389                 }
 390                 close(fds[0]);
 391                 res = wait(&status);
 392                 if (res < 0) {
 393                         dbg("wait failed result %d", res);
 394                         retval = -1;
 395                 }
 396
 397                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 398                         dbg("exec program status 0x%x", status);
 399                         retval = -1;
 400                 }
 401         }
 402         return retval;
 403 }
 404
 405 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
 406 {
 407         struct sysfs_attribute *tmpattr = NULL;
 408         char *c;
 409
 410         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
 411                 return -ENODEV;
 412
 413         dbg("look for device attribute '%s'", pair->file);
 414         /* try to find the attribute in the class device directory */
 415         tmpattr = sysfs_get_classdev_attr(class_dev, pair->file);
 416         if (tmpattr)
 417                 goto label_found;
 418
 419         /* look in the class device directory if present */
 420         if (sysfs_device) {
 421                 tmpattr = sysfs_get_device_attr(sysfs_device, pair->file);
 422                 if (tmpattr)
 423                         goto label_found;
 424         }
 425         return -ENODEV;
 426
 427 label_found:
 428         c = tmpattr->value + strlen(tmpattr->value)-1;
 429         if (*c == '\n')
 430                 *c = 0x00;
 431         dbg("compare attribute '%s' value '%s' with '%s'",
 432                   pair->file, tmpattr->value, pair->value);
 433         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 434                 return -ENODEV;
 435
 436         dbg("found matching attribute '%s' with value '%s'",
 437             pair->file, pair->value);
 438         return 0;
 439 }
 440
 441 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 442 {
 443         struct sysfs_pair *pair;
 444         int i;
 445
 446         for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
 447                 pair = &dev->sysfs_pair[i];
 448                 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
 449                         break;
 450                 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
 451                         dbg("sysfs attribute doesn't match");
 452                         return -ENODEV;
 453                 }
 454         }
 455
 456         return 0;
 457 }
 458
 459 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 460 {
 461         char path[SYSFS_PATH_MAX];
 462         int found;
 463         char *temp = NULL;
 464
 465         /* we have to have a sysfs device for ID to work */
 466         if (!sysfs_device)
 467                 return -ENODEV;
 468
 469         found = 0;
 470         strfieldcpy(path, sysfs_device->path);
 471         temp = strrchr(path, '/');
 472         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 473         if (strstr(temp, dev->id) != NULL) {
 474                 found = 1;
 475         } else {
 476                 *temp = 0x00;
 477                 temp = strrchr(path, '/');
 478                 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 479                 if (strstr(temp, dev->id) != NULL)
 480                         found = 1;
 481         }
 482         if (!found) {
 483                 dbg("id doesn't match");
 484                 return -ENODEV;
 485         }
 486
 487         return 0;
 488 }
 489
 490 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 491 {
 492         char path[SYSFS_PATH_MAX];
 493         int found;
 494         char *temp = NULL;
 495
 496         /* we have to have a sysfs device for PLACE to work */
 497         if (!sysfs_device)
 498                 return -ENODEV;
 499
 500         found = 0;
 501         strfieldcpy(path, sysfs_device->path);
 502         temp = strrchr(path, '/');
 503         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 504         if (strstr(temp, dev->place) != NULL) {
 505                 found = 1;
 506         } else {
 507                 *temp = 0x00;
 508                 temp = strrchr(path, '/');
 509                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 510                 if (strstr(temp, dev->place) != NULL)
 511                         found = 1;
 512         }
 513         if (!found) {
 514                 dbg("place doesn't match");
 515                 return -ENODEV;
 516         }
 517
 518         return 0;
 519 }
 520
 521 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
 522 {
 523         struct sysfs_device *sysfs_device;
 524         struct sysfs_class_device *class_dev_parent;
 525         struct timespec tspec;
 526         int loop;
 527
 528         /* Figure out where the device symlink is at.  For char devices this will
 529          * always be in the class_dev->path.  But for block devices, it's different.
 530          * The main block device will have the device symlink in it's path, but
 531          * all partitions have the symlink in its parent directory.
 532          * But we need to watch out for block devices that do not have parents, yet
 533          * look like a partition (fd0, loop0, etc.)  They all do not have a device
 534          * symlink yet.  We do sit and spin on waiting for them right now, we should
 535          * possibly have a whitelist for these devices here...
 536          */
 537         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 538         if (class_dev_parent)
 539                 dbg("Really a partition");
 540
 541         tspec.tv_sec = 0;
 542         tspec.tv_nsec = 10000000;  /* sleep 10 millisec */
 543         loop = 10;
 544         while (loop--) {
 545                 nanosleep(&tspec, NULL);
 546                 if (class_dev_parent)
 547                         sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 548                 else
 549                         sysfs_device = sysfs_get_classdev_device(class_dev);
 550
 551                 if (sysfs_device != NULL)
 552                         goto device_found;
 553         }
 554         dbg("timed out waiting for device symlink, continuing on anyway...");
 555
 556 device_found:
 557         /* We have another issue with just the wait above - the sysfs part of
 558          * the kernel may not be quick enough to have created the link to the
 559          * device under the "bus" subsystem. Due to this, the sysfs_device->bus
 560          * will not contain the actual bus name :(
 561          *
 562          * Libsysfs now provides a new API sysfs_get_device_bus(), so use it
 563          * if needed
 564          */
 565         if (sysfs_device) {
 566                 if (sysfs_device->bus[0] != '\0')
 567                         goto bus_found;
 568
 569                 loop = 10;
 570                 tspec.tv_nsec = 10000000;
 571                 while (loop--) {
 572                         nanosleep(&tspec, NULL);
 573                         sysfs_get_device_bus(sysfs_device);
 574
 575                         if (sysfs_device->bus[0] != '\0')
 576                                 goto bus_found;
 577                 }
 578                 dbg("timed out waiting to find the device bus, continuing on anyway");
 579                 goto exit;
 580 bus_found:
 581                 dbg("device %s is registered with bus '%s'",
 582                                 sysfs_device->name, sysfs_device->bus);
 583         }
 584 exit:
 585         return sysfs_device;
 586 }
 587
 588 static int match_rule(struct config_device *dev, struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 589 {
 590         while (1) {
 591                 /* check for matching bus value */
 592                 if (dev->bus[0] != '\0') {
 593                         if (sysfs_device == NULL) {
 594                                 dbg("device has no bus");
 595                                 goto no_good;
 596                         }
 597                         dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 598                         if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
 599                                 dbg(FIELD_BUS " is not matching");
 600                                 goto no_good;
 601                         } else {
 602                                 dbg(FIELD_BUS " matches");
 603                         }
 604                 }
 605
 606                 /* check for matching kernel name*/
 607                 if (dev->kernel[0] != '\0') {
 608                         dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name);
 609                         if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
 610                                 dbg(FIELD_KERNEL " is not matching");
 611                                 goto no_good;
 612                         } else {
 613                                 dbg(FIELD_KERNEL " matches");
 614                         }
 615                 }
 616
 617                 /* check for matching bus id */
 618                 if (dev->id[0] != '\0') {
 619                         dbg("check " FIELD_ID);
 620                         if (match_id(dev, class_dev, sysfs_device) != 0) {
 621                                 dbg(FIELD_ID " is not matching");
 622                                 goto no_good;
 623                         } else {
 624                                 dbg(FIELD_ID " matches");
 625                         }
 626                 }
 627
 628                 /* check for matching place of device */
 629                 if (dev->place[0] != '\0') {
 630                         dbg("check " FIELD_PLACE);
 631                         if (match_place(dev, class_dev, sysfs_device) != 0) {
 632                                 dbg(FIELD_PLACE " is not matching");
 633                                 goto no_good;
 634                         } else {
 635                                 dbg(FIELD_PLACE " matches");
 636                         }
 637                 }
 638
 639                 /* check for matching sysfs pairs */
 640                 if (dev->sysfs_pair[0].file[0] != '\0') {
 641                         dbg("check " FIELD_SYSFS " pairs");
 642                         if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
 643                                 dbg(FIELD_SYSFS " is not matching");
 644                                 goto no_good;
 645                         } else {
 646                                 dbg(FIELD_SYSFS " matches");
 647                         }
 648                 }
 649
 650                 /* execute external program */
 651                 if (dev->program[0] != '\0') {
 652                         dbg("check " FIELD_PROGRAM);
 653                         apply_format(udev, dev->program);
 654                         if (execute_program(dev->program, udev->program_result, NAME_SIZE) != 0) {
 655                                 dbg(FIELD_PROGRAM " returned nozero");
 656                                 goto no_good;
 657                         } else {
 658                                 dbg(FIELD_PROGRAM " returned successful");
 659                         }
 660                 }
 661
 662                 /* check for matching result of external program */
 663                 if (dev->result[0] != '\0') {
 664                         dbg("check for " FIELD_RESULT
 665                             " dev->result='%s', udev->program_result='%s'",
 666                             dev->result, udev->program_result);
 667                         if (strcmp_pattern(dev->result, udev->program_result) != 0) {
 668                                 dbg(FIELD_RESULT " is not matching");
 669                                 goto no_good;
 670                         } else {
 671                                 dbg(FIELD_RESULT " matches");
 672                         }
 673                 }
 674
 675                 /* check if we are instructed to ignore this device */
 676                 if (dev->name[0] == '\0') {
 677                         dbg("instructed to ignore this device");
 678                         return -1;
 679                 }
 680
 681                 /* Yeah, we matched! */
 682                 return 0;
 683
 684 no_good:
 685                 sysfs_device = sysfs_get_device_parent(sysfs_device);
 686                 if (sysfs_device == NULL)
 687                         return -ENODEV;
 688                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 689                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 690                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 691         }
 692
 693 }
 694
 695 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 696 {
 697         struct sysfs_device *sysfs_device = NULL;
 698         struct config_device *dev;
 699         struct perm_device *perm;
 700         char *pos;
 701
 702         udev->mode = 0;
 703
 704         /* find the sysfs_device associated with this class device */
 705         sysfs_device = get_sysfs_device(class_dev);
 706         if (sysfs_device) {
 707                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 708                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 709                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 710                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 711                 wait_for_device_to_initialize(sysfs_device);
 712         } else {
 713                 dbg("class_dev->name = '%s'", class_dev->name);
 714         }
 715
 716         strfieldcpy(udev->kernel_name, class_dev->name);
 717
 718         /* get kernel number */
 719         pos = class_dev->name + strlen(class_dev->name);
 720         while (isdigit(*(pos-1)))
 721                 pos--;
 722         strfieldcpy(udev->kernel_number, pos);
 723         dbg("kernel_number='%s'", udev->kernel_number);
 724
 725         /* look for a matching rule to apply */
 726         list_for_each_entry(dev, &config_device_list, node) {
 727                 dbg("process rule");
 728
 729                 if (match_rule(dev, class_dev, udev, sysfs_device) == 0) {
 730                         /* Yup, this rule belongs to us! */
 731                         info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
 732                             udev_rules_filename, dev->config_line, udev->kernel_name, dev->name);
 733                         strfieldcpy(udev->name, dev->name);
 734                         strfieldcpy(udev->symlink, dev->symlink);
 735                         goto found;
 736                 }
 737         }
 738
 739         /* no rule was found so we use the kernel name */
 740         strfieldcpy(udev->name, class_dev->name);
 741         goto done;
 742
 743 found:
 744         /* substitute placeholder */
 745         apply_format(udev, udev->name);
 746         apply_format(udev, udev->symlink);
 747
 748 done:
 749         perm = find_perm(udev->name);
 750         if (perm) {
 751                 udev->mode = perm->mode;
 752                 strfieldcpy(udev->owner, perm->owner);
 753                 strfieldcpy(udev->group, perm->group);
 754         } else {
 755                 /* no matching perms found :( */
 756                 udev->mode = get_default_mode();
 757                 strncpy(udev->owner, get_default_owner(), OWNER_SIZE);
 758                 strncpy(udev->group, get_default_group(), GROUP_SIZE);
 759         }
 760         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 761             udev->name, udev->owner, udev->group, udev->mode);
 762
 763         return 0;
 764 }
 765
 766 int namedev_init(void)
 767 {
 768         int retval;
 769
 770         retval = namedev_init_rules();
 771         if (retval)
 772                 return retval;
 773
 774         retval = namedev_init_permissions();
 775         if (retval)
 776                 return retval;
 777
 778         dump_config_dev_list();
 779         dump_perm_dev_list();
 780         return retval;
 781 }