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 <sys/wait.h>
  33 #include <sys/stat.h>
  34
  35 #include "list.h"
  36 #include "udev.h"
  37 #include "udev_version.h"
  38 #include "namedev.h"
  39 #include "libsysfs/libsysfs.h"
  40 #include "klibc_fixups.h"
  41
  42 LIST_HEAD(config_device_list);
  43 LIST_HEAD(perm_device_list);
  44
  45 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  46 static int strcmp_pattern(const char *p, const char *s)
  47 {
  48         if (*s == '\0') {
  49                 while (*p == '*')
  50                         p++;
  51                 return (*p != '\0');
  52         }
  53         switch (*p) {
  54         case '[':
  55                 {
  56                         int not = 0;
  57                         p++;
  58                         if (*p == '!') {
  59                                 not = 1;
  60                                 p++;
  61                         }
  62                         while (*p && (*p != ']')) {
  63                                 int match = 0;
  64                                 if (p[1] == '-') {
  65                                         if ((*s >= *p) && (*s <= p[2]))
  66                                                 match = 1;
  67                                         p += 3;
  68                                 } else {
  69                                         match = (*p == *s);
  70                                         p++;
  71                                 }
  72                                 if (match ^ not) {
  73                                         while (*p && (*p != ']'))
  74                                                 p++;
  75                                         return strcmp_pattern(p+1, s+1);
  76                                 }
  77                         }
  78                 }
  79                 break;
  80         case '*':
  81                 if (strcmp_pattern(p, s+1))
  82                         return strcmp_pattern(p+1, s);
  83                 return 0;
  84         case '\0':
  85                 if (*s == '\0') {
  86                         return 0;
  87                 }
  88                 break;
  89         default:
  90                 if ((*p == *s) || (*p == '?'))
  91                         return strcmp_pattern(p+1, s+1);
  92                 break;
  93         }
  94         return 1;
  95 }
  96
  97 #define copy_var(a, b, var)             \
  98         if (b->var)                     \
  99                 a->var = b->var;
 100
 101 #define copy_string(a, b, var)          \
 102         if (strlen(b->var))             \
 103                 strcpy(a->var, b->var);
 104
 105 int add_config_dev(struct config_device *new_dev)
 106 {
 107         struct config_device *tmp_dev;
 108
 109         tmp_dev = malloc(sizeof(*tmp_dev));
 110         if (tmp_dev == NULL)
 111                 return -ENOMEM;
 112         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 113         list_add_tail(&tmp_dev->node, &config_device_list);
 114         //dump_config_dev(tmp_dev);
 115         return 0;
 116 }
 117
 118 int add_perm_dev(struct perm_device *new_dev)
 119 {
 120         struct list_head *tmp;
 121         struct perm_device *tmp_dev;
 122
 123         /* update the values if we already have the device */
 124         list_for_each(tmp, &perm_device_list) {
 125                 struct perm_device *dev = list_entry(tmp, struct perm_device, node);
 126                 if (strcmp_pattern(new_dev->name, dev->name))
 127                         continue;
 128                 copy_var(dev, new_dev, mode);
 129                 copy_string(dev, new_dev, owner);
 130                 copy_string(dev, new_dev, group);
 131                 return 0;
 132         }
 133
 134         /* not found, add new structure to the perm list */
 135         tmp_dev = malloc(sizeof(*tmp_dev));
 136         if (!tmp_dev)
 137                 return -ENOMEM;
 138         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 139         list_add_tail(&tmp_dev->node, &perm_device_list);
 140         //dump_perm_dev(tmp_dev);
 141         return 0;
 142 }
 143
 144 static struct perm_device *find_perm(char *name)
 145 {
 146         struct list_head *tmp;
 147         struct perm_device *perm = NULL;
 148
 149         list_for_each(tmp, &perm_device_list) {
 150                 perm = list_entry(tmp, struct perm_device, node);
 151                 if (strcmp_pattern(perm->name, name))
 152                         continue;
 153                 return perm;
 154         }
 155         return NULL;
 156 }
 157
 158 static mode_t get_default_mode(struct sysfs_class_device *class_dev)
 159 {
 160         mode_t mode = 0600;     /* default to owner rw only */
 161
 162         if (strlen(default_mode_str) != 0) {
 163                 mode = strtol(default_mode_str, NULL, 8);
 164         }
 165         return mode;
 166 }
 167
 168 static void apply_format(struct udevice *udev, unsigned char *string)
 169 {
 170         char name[NAME_SIZE];
 171         char temp[NAME_SIZE];
 172         char *tail;
 173         char *pos;
 174         char *pos2;
 175         char *pos3;
 176         int num;
 177
 178         while (1) {
 179                 num = 0;
 180                 pos = strchr(string, '%');
 181
 182                 if (pos) {
 183                         *pos = '\0';
 184                         tail = pos+1;
 185                         if (isdigit(tail[0])) {
 186                                 num = (int) strtoul(&pos[1], &tail, 10);
 187                                 if (tail == NULL) {
 188                                         dbg("format parsing error '%s'", pos+1);
 189                                         break;
 190                                 }
 191                         }
 192                         strfieldcpy(name, tail+1);
 193
 194                         switch (tail[0]) {
 195                         case 'b':
 196                                 if (strlen(udev->bus_id) == 0)
 197                                         break;
 198                                 strcat(pos, udev->bus_id);
 199                                 dbg("substitute bus_id '%s'", udev->bus_id);
 200                                 break;
 201                         case 'k':
 202                                 if (strlen(udev->kernel_name) == 0)
 203                                         break;
 204                                 strcat(pos, udev->kernel_name);
 205                                 dbg("substitute kernel name '%s'", udev->kernel_name);
 206                                 break;
 207                         case 'n':
 208                                 if (strlen(udev->kernel_number) == 0)
 209                                         break;
 210                                 strcat(pos, udev->kernel_number);
 211                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 212                                 break;
 213                         case 'D':
 214                                 if (strlen(udev->kernel_number) == 0) {
 215                                         strcat(pos, "disc");
 216                                         break;
 217                                 }
 218                                 strcat(pos, "part");
 219                                 strcat(pos, udev->kernel_number);
 220                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 221                                 break;
 222                         case 'm':
 223                                 sprintf(pos, "%u", udev->minor);
 224                                 dbg("substitute minor number '%u'", udev->minor);
 225                                 break;
 226                         case 'M':
 227                                 sprintf(pos, "%u", udev->major);
 228                                 dbg("substitute major number '%u'", udev->major);
 229                                 break;
 230                         case 'c':
 231                                 if (strlen(udev->callout_value) == 0)
 232                                         break;
 233                                 if (num) {
 234                                         /* get part of return string */
 235                                         strncpy(temp, udev->callout_value, sizeof(temp));
 236                                         pos2 = temp;
 237                                         while (num) {
 238                                                 num--;
 239                                                 pos3 = strsep(&pos2, " ");
 240                                                 if (pos3 == NULL) {
 241                                                         dbg("requested part of callout string not found");
 242                                                         break;
 243                                                 }
 244                                         }
 245                                         strcat(pos, pos3);
 246                                         dbg("substitute partial callout output '%s'", pos3);
 247                                 } else {
 248                                         strcat(pos, udev->callout_value);
 249                                         dbg("substitute callout output '%s'", udev->callout_value);
 250                                 }
 251                                 break;
 252                         default:
 253                                 dbg("unknown substitution type '%%%c'", pos[1]);
 254                                 break;
 255                         }
 256                         strcat(string, name);
 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         {}
 269 };
 270
 271 #define SECONDS_TO_WAIT_FOR_FILE        10
 272 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
 273 {
 274         /* sleep until we see the file for this specific bus type show up this
 275          * is needed because we can easily out-run the kernel in looking for
 276          * these files before the paticular subsystem has created them in the
 277          * sysfs tree properly.
 278          *
 279          * And people thought that the /sbin/hotplug event system was going to
 280          * be slow, poo on you for arguing that before even testing it...
 281          */
 282         struct bus_file *b = &bus_files[0];
 283         struct sysfs_attribute *tmpattr;
 284         int loop;
 285
 286         while (1) {
 287                 if (b->bus == NULL)
 288                         break;
 289                 if (strcmp(sysfs_device->bus, b->bus) == 0) {
 290                         tmpattr = NULL;
 291                         loop = SECONDS_TO_WAIT_FOR_FILE;
 292                         while (loop--) {
 293                                 dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
 294                                 tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
 295                                 if (tmpattr) {
 296                                         /* found it! */
 297                                         goto exit;
 298                                 }
 299                                 /* sleep to give the kernel a chance to create the file */
 300                                 sleep(1);
 301                         }
 302                         dbg("Timed out waiting for '%s' file, continuing on anyway...", b->file);
 303                         goto exit;
 304                 }
 305                 b++;
 306         }
 307         dbg("Did not find bus type '%s' on list of bus_id_files, contact greg@kroah.com", sysfs_device->bus);
 308 exit:
 309         return; /* here to prevent compiler warning... */
 310 }
 311
 312 static int exec_callout(struct config_device *dev, char *value, int len)
 313 {
 314         int retval;
 315         int res;
 316         int status;
 317         int fds[2];
 318         pid_t pid;
 319         int value_set = 0;
 320         char buffer[256];
 321         char *pos;
 322         char *args[CALLOUT_MAXARG];
 323         int i;
 324
 325         dbg("callout to '%s'", dev->exec_program);
 326         retval = pipe(fds);
 327         if (retval != 0) {
 328                 dbg("pipe failed");
 329                 return -1;
 330         }
 331         pid = fork();
 332         if (pid == -1) {
 333                 dbg("fork failed");
 334                 return -1;
 335         }
 336
 337         if (pid == 0) {
 338                 /* child */
 339                 close(STDOUT_FILENO);
 340                 dup(fds[1]);    /* dup write side of pipe to STDOUT */
 341                 if (strchr(dev->exec_program, ' ')) {
 342                         /* callout with arguments */
 343                         pos = dev->exec_program;
 344                         for (i=0; i < CALLOUT_MAXARG-1; i++) {
 345                                 args[i] = strsep(&pos, " ");
 346                                 if (args[i] == NULL)
 347                                         break;
 348                         }
 349                         if (args[i]) {
 350                                 dbg("too many args - %d", i);
 351                                 args[i] = NULL;
 352                         }
 353                         retval = execve(args[0], args, main_envp);
 354                 } else {
 355                         retval = execve(dev->exec_program, main_argv, main_envp);
 356                 }
 357                 if (retval != 0) {
 358                         dbg("child execve failed");
 359                         exit(1);
 360                 }
 361                 return -1; /* avoid compiler warning */
 362         } else {
 363                 /* parent reads from fds[0] */
 364                 close(fds[1]);
 365                 retval = 0;
 366                 while (1) {
 367                         res = read(fds[0], buffer, sizeof(buffer) - 1);
 368                         if (res <= 0)
 369                                 break;
 370                         buffer[res] = '\0';
 371                         if (res > len) {
 372                                 dbg("callout len %d too short", len);
 373                                 retval = -1;
 374                         }
 375                         if (value_set) {
 376                                 dbg("callout value already set");
 377                                 retval = -1;
 378                         } else {
 379                                 value_set = 1;
 380                                 strncpy(value, buffer, len);
 381                                 pos = value + strlen(value)-1;
 382                                 if (pos[0] == '\n')
 383                                 pos[0] = '\0';
 384                                 dbg("callout returned '%s'", value);
 385                         }
 386                 }
 387                 close(fds[0]);
 388                 res = wait(&status);
 389                 if (res < 0) {
 390                         dbg("wait failed result %d", res);
 391                         retval = -1;
 392                 }
 393
 394 #ifndef __KLIBC__
 395                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 396                         dbg("callout program status 0x%x", status);
 397                         retval = -1;
 398                 }
 399 #endif
 400         }
 401         return retval;
 402 }
 403
 404 static int do_callout(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 405 {
 406         struct config_device *dev;
 407         struct list_head *tmp;
 408
 409         list_for_each(tmp, &config_device_list) {
 410                 dev = list_entry(tmp, struct config_device, node);
 411                 if (dev->type != CALLOUT)
 412                         continue;
 413
 414                 if (sysfs_device) {
 415                         dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 416                         if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 417                                 continue;
 418                 }
 419
 420                 /* substitute anything that needs to be in the program name */
 421                 apply_format(udev, dev->exec_program);
 422                 if (exec_callout(dev, udev->callout_value, NAME_SIZE))
 423                         continue;
 424                 if (strcmp_pattern(dev->id, udev->callout_value) != 0)
 425                         continue;
 426                 strfieldcpy(udev->name, dev->name);
 427                 strfieldcpy(udev->symlink, dev->symlink);
 428                 dbg("callout returned matching value '%s', '%s' becomes '%s'",
 429                     dev->id, class_dev->name, udev->name);
 430                 return 0;
 431         }
 432         return -ENODEV;
 433 }
 434
 435 static int do_label(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 436 {
 437         struct sysfs_attribute *tmpattr = NULL;
 438         struct config_device *dev;
 439         struct list_head *tmp;
 440         char *c;
 441
 442         list_for_each(tmp, &config_device_list) {
 443                 dev = list_entry(tmp, struct config_device, node);
 444                 if (dev->type != LABEL)
 445                         continue;
 446
 447                 if (sysfs_device) {
 448                         dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 449                         if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 450                                 continue;
 451                 }
 452
 453                 dbg("look for device attribute '%s'", dev->sysfs_file);
 454                 /* try to find the attribute in the class device directory */
 455                 tmpattr = sysfs_get_classdev_attr(class_dev, dev->sysfs_file);
 456                 if (tmpattr)
 457                         goto label_found;
 458
 459                 /* look in the class device directory if present */
 460                 if (sysfs_device) {
 461                         tmpattr = sysfs_get_device_attr(sysfs_device, dev->sysfs_file);
 462                         if (tmpattr)
 463                                 goto label_found;
 464                 }
 465
 466                 continue;
 467
 468 label_found:
 469                 c = tmpattr->value + strlen(tmpattr->value)-1;
 470                 if (*c == '\n')
 471                         *c = 0x00;
 472                 dbg("compare attribute '%s' value '%s' with '%s'",
 473                           dev->sysfs_file, tmpattr->value, dev->sysfs_value);
 474                 if (strcmp_pattern(dev->sysfs_value, tmpattr->value) != 0)
 475                         continue;
 476
 477                 strfieldcpy(udev->name, dev->name);
 478                 strfieldcpy(udev->symlink, dev->symlink);
 479                 dbg("found matching attribute '%s', '%s' becomes '%s' ",
 480                     dev->sysfs_file, class_dev->name, udev->name);
 481
 482                 return 0;
 483         }
 484         return -ENODEV;
 485 }
 486
 487 static int do_number(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 488 {
 489         struct config_device *dev;
 490         struct list_head *tmp;
 491         char path[SYSFS_PATH_MAX];
 492         int found;
 493         char *temp = NULL;
 494
 495         /* we have to have a sysfs device for NUMBER to work */
 496         if (!sysfs_device)
 497                 return -ENODEV;
 498
 499         list_for_each(tmp, &config_device_list) {
 500                 dev = list_entry(tmp, struct config_device, node);
 501                 if (dev->type != NUMBER)
 502                         continue;
 503
 504                 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 505                 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 506                         continue;
 507
 508                 found = 0;
 509                 strfieldcpy(path, sysfs_device->path);
 510                 temp = strrchr(path, '/');
 511                 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 512                 if (strstr(temp, dev->id) != NULL) {
 513                         found = 1;
 514                 } else {
 515                         *temp = 0x00;
 516                         temp = strrchr(path, '/');
 517                         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 518                         if (strstr(temp, dev->id) != NULL)
 519                                 found = 1;
 520                 }
 521                 if (!found)
 522                         continue;
 523                 strfieldcpy(udev->name, dev->name);
 524                 strfieldcpy(udev->symlink, dev->symlink);
 525                 dbg("found matching id '%s', '%s' becomes '%s'",
 526                     dev->id, class_dev->name, udev->name);
 527                 return 0;
 528         }
 529         return -ENODEV;
 530 }
 531
 532 static int do_topology(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 533 {
 534         struct config_device *dev;
 535         struct list_head *tmp;
 536         char path[SYSFS_PATH_MAX];
 537         int found;
 538         char *temp = NULL;
 539
 540         /* we have to have a sysfs device for TOPOLOGY to work */
 541         if (!sysfs_device)
 542                 return -ENODEV;
 543
 544         list_for_each(tmp, &config_device_list) {
 545                 dev = list_entry(tmp, struct config_device, node);
 546                 if (dev->type != TOPOLOGY)
 547                         continue;
 548
 549                 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 550                 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 551                         continue;
 552
 553                 found = 0;
 554                 strfieldcpy(path, sysfs_device->path);
 555                 temp = strrchr(path, '/');
 556                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 557                 if (strstr(temp, dev->place) != NULL) {
 558                         found = 1;
 559                 } else {
 560                         *temp = 0x00;
 561                         temp = strrchr(path, '/');
 562                         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 563                         if (strstr(temp, dev->place) != NULL)
 564                                 found = 1;
 565                 }
 566                 if (!found)
 567                         continue;
 568
 569                 strfieldcpy(udev->name, dev->name);
 570                 strfieldcpy(udev->symlink, dev->symlink);
 571                 dbg("found matching place '%s', '%s' becomes '%s'",
 572                     dev->place, class_dev->name, udev->name);
 573                 return 0;
 574         }
 575         return -ENODEV;
 576 }
 577
 578 static int do_replace(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 579 {
 580         struct config_device *dev;
 581         struct list_head *tmp;
 582
 583         list_for_each(tmp, &config_device_list) {
 584                 dev = list_entry(tmp, struct config_device, node);
 585                 if (dev->type != REPLACE)
 586                         continue;
 587
 588                 dbg("compare name '%s' with '%s'", dev->kernel_name, class_dev->name);
 589                 if (strcmp_pattern(dev->kernel_name, class_dev->name) != 0)
 590                         continue;
 591
 592                 strfieldcpy(udev->name, dev->name);
 593                 strfieldcpy(udev->symlink, dev->symlink);
 594                 dbg("found name, '%s' becomes '%s'", dev->kernel_name, udev->name);
 595
 596                 return 0;
 597         }
 598         return -ENODEV;
 599 }
 600
 601 static void do_kernelname(struct sysfs_class_device *class_dev, struct udevice *udev)
 602 {
 603         /* heh, this is pretty simple... */
 604         strfieldcpy(udev->name, class_dev->name);
 605 }
 606
 607 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
 608 {
 609         struct sysfs_device *sysfs_device;
 610         struct sysfs_class_device *class_dev_parent;
 611         int loop;
 612
 613         /* FIXME!!! */
 614         /* This is needed here as we can easily out-race the placement of the
 615          * device symlink by the kernel.  The call to sleep(1); will be removed
 616          * once libsysfs can be queried for sysfs_get_classdev_device()
 617          * multiple times and have it return the proper information when the
 618          * class device really shows up.  For now, we live with the time
 619          * delay...
 620          */
 621         sleep(1);
 622
 623 #if 0   /* FIXME
 624            Something like this could also work, but for some reason doesn't,
 625            I also tried just stat() on the device symlink, but that still
 626            has nasty races, I'm probably doing something stupid... :( */
 627         loop = 10;
 628         while (loop--) {
 629                 struct stat buf;
 630                 int retval;
 631                 char filename[SYSFS_PATH_MAX + 6];
 632
 633                 strcpy(filename, class_dev->path);
 634                 strcat(filename, "/device");
 635                 dbg("looking for '%s'", filename);
 636                 retval = stat(filename, &buf);
 637                 if (!retval)
 638                         break;
 639
 640                 /* bah, let's go backwards up a level to see if the device is there,
 641                  * as block partitions don't point to the physical device.  Need to fix that
 642                  * up in the kernel...
 643                  */
 644                 if (strcmp(class_dev->classname, SYSFS_BLOCK_NAME) == 0) {
 645                         if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
 646                                 class_dev_parent = sysfs_get_classdev_parent(class_dev);
 647                                 if (class_dev_parent == NULL) {
 648                                         dbg("sysfs_get_classdev_parent for class device '%s' failed", class_dev->name);
 649                                 } else {
 650                                         strcpy(filename, class_dev_parent->path);
 651                                         strcat(filename, "/device");
 652                                         dbg("looking for '%s'", filename);
 653                                         retval = stat(filename, &buf);
 654                                         if (!retval)
 655                                                 break;
 656                                 }
 657                         }
 658                 }
 659                 /* sleep to give the kernel a chance to create the device file */
 660                 sleep(1);
 661         }
 662 #endif
 663         loop = 1;       /* FIXME put a real value in here for when everything is fixed... */
 664         while (loop--) {
 665                 /* find the sysfs_device for this class device */
 666                 /* Wouldn't it really be nice if libsysfs could do this for us? */
 667                 sysfs_device = sysfs_get_classdev_device(class_dev);
 668                 if (sysfs_device != NULL)
 669                         goto exit;
 670
 671                 /* bah, let's go backwards up a level to see if the device is there,
 672                  * as block partitions don't point to the physical device.  Need to fix that
 673                  * up in the kernel...
 674                  */
 675                 if (strcmp(class_dev->classname, SYSFS_BLOCK_NAME) == 0) {
 676                         dbg("looking at block device");
 677                         if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
 678                                 dbg("really is a partition");
 679                                 class_dev_parent = sysfs_get_classdev_parent(class_dev);
 680                                 if (class_dev_parent == NULL) {
 681                                         dbg("sysfs_get_classdev_parent for class device '%s' failed", class_dev->name);
 682                                 } else {
 683                                         dbg("class_dev_parent->name='%s'", class_dev_parent->name);
 684                                         sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 685                                         if (sysfs_device != NULL)
 686                                                 goto exit;
 687                                 }
 688                         }
 689                 }
 690                 /* sleep to give the kernel a chance to create the link */
 691                 sleep(1);
 692
 693         }
 694         dbg("Timed out waiting for device symlink, continuing on anyway...");
 695 exit:
 696         return sysfs_device;
 697 }
 698
 699 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 700 {
 701         struct sysfs_device *sysfs_device = NULL;
 702         struct sysfs_class_device *class_dev_parent = NULL;
 703         int retval = 0;
 704         struct perm_device *perm;
 705         char *pos;
 706
 707         udev->mode = 0;
 708
 709         /* find the sysfs_device associated with this class device */
 710         sysfs_device = get_sysfs_device(class_dev);
 711         if (sysfs_device) {
 712                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 713                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 714                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 715                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 716                 wait_for_device_to_initialize(sysfs_device);
 717         } else {
 718                 dbg("class_dev->name = '%s'", class_dev->name);
 719         }
 720
 721         strfieldcpy(udev->kernel_name, class_dev->name);
 722
 723         /* get kernel number */
 724         pos = class_dev->name + strlen(class_dev->name);
 725         while (isdigit(*(pos-1)))
 726                 pos--;
 727         strfieldcpy(udev->kernel_number, pos);
 728         dbg("kernel_number='%s'", udev->kernel_number);
 729
 730         /* rules are looked at in priority order */
 731         retval = do_callout(class_dev, udev, sysfs_device);
 732         if (retval == 0)
 733                 goto found;
 734
 735         retval = do_label(class_dev, udev, sysfs_device);
 736         if (retval == 0)
 737                 goto found;
 738
 739         retval = do_number(class_dev, udev, sysfs_device);
 740         if (retval == 0)
 741                 goto found;
 742
 743         retval = do_topology(class_dev, udev, sysfs_device);
 744         if (retval == 0)
 745                 goto found;
 746
 747         retval = do_replace(class_dev, udev, sysfs_device);
 748         if (retval == 0)
 749                 goto found;
 750
 751         do_kernelname(class_dev, udev);
 752         goto done;
 753
 754 found:
 755         /* substitute placeholder */
 756         apply_format(udev, udev->name);
 757         apply_format(udev, udev->symlink);
 758
 759 done:
 760         perm = find_perm(udev->name);
 761         if (perm) {
 762                 udev->mode = perm->mode;
 763                 strfieldcpy(udev->owner, perm->owner);
 764                 strfieldcpy(udev->group, perm->group);
 765         } else {
 766                 /* no matching perms found :( */
 767                 udev->mode = get_default_mode(class_dev);
 768                 udev->owner[0] = 0x00;
 769                 udev->group[0] = 0x00;
 770         }
 771         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 772             udev->name, udev->owner, udev->group, udev->mode);
 773
 774         return 0;
 775 }
 776
 777 int namedev_init(void)
 778 {
 779         int retval;
 780
 781         retval = namedev_init_rules();
 782         if (retval)
 783                 return retval;
 784
 785         retval = namedev_init_permissions();
 786         if (retval)
 787                 return retval;
 788
 789         dump_config_dev_list();
 790         dump_perm_dev_list();
 791         return retval;
 792 }