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 list_head *tmp;
 108         struct config_device *tmp_dev;
 109
 110         /* update the values if we already have the device */
 111         list_for_each(tmp, &config_device_list) {
 112                 struct config_device *dev = list_entry(tmp, struct config_device, node);
 113                 if (strcmp_pattern(new_dev->name, dev->name))
 114                         continue;
 115                 if (strncmp(dev->bus, new_dev->bus, sizeof(dev->name)))
 116                         continue;
 117                 copy_var(dev, new_dev, type);
 118                 copy_string(dev, new_dev, bus);
 119                 copy_string(dev, new_dev, sysfs_file);
 120                 copy_string(dev, new_dev, sysfs_value);
 121                 copy_string(dev, new_dev, id);
 122                 copy_string(dev, new_dev, place);
 123                 copy_string(dev, new_dev, kernel_name);
 124                 copy_string(dev, new_dev, exec_program);
 125                 copy_string(dev, new_dev, symlink);
 126                 return 0;
 127         }
 128
 129         /* not found, add new structure to the device list */
 130         tmp_dev = malloc(sizeof(*tmp_dev));
 131         if (!tmp_dev)
 132                 return -ENOMEM;
 133         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 134         list_add_tail(&tmp_dev->node, &config_device_list);
 135         //dump_config_dev(tmp_dev);
 136         return 0;
 137 }
 138
 139 int add_perm_dev(struct perm_device *new_dev)
 140 {
 141         struct list_head *tmp;
 142         struct perm_device *tmp_dev;
 143
 144         /* update the values if we already have the device */
 145         list_for_each(tmp, &perm_device_list) {
 146                 struct perm_device *dev = list_entry(tmp, struct perm_device, node);
 147                 if (strcmp_pattern(new_dev->name, dev->name))
 148                         continue;
 149                 copy_var(dev, new_dev, mode);
 150                 copy_string(dev, new_dev, owner);
 151                 copy_string(dev, new_dev, group);
 152                 return 0;
 153         }
 154
 155         /* not found, add new structure to the perm list */
 156         tmp_dev = malloc(sizeof(*tmp_dev));
 157         if (!tmp_dev)
 158                 return -ENOMEM;
 159         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 160         list_add_tail(&tmp_dev->node, &perm_device_list);
 161         //dump_perm_dev(tmp_dev);
 162         return 0;
 163 }
 164
 165 static struct perm_device *find_perm(char *name)
 166 {
 167         struct list_head *tmp;
 168         struct perm_device *perm = NULL;
 169
 170         list_for_each(tmp, &perm_device_list) {
 171                 perm = list_entry(tmp, struct perm_device, node);
 172                 if (strcmp_pattern(perm->name, name))
 173                         continue;
 174                 return perm;
 175         }
 176         return NULL;
 177 }
 178
 179 static mode_t get_default_mode(struct sysfs_class_device *class_dev)
 180 {
 181         mode_t mode = 0600;     /* default to owner rw only */
 182
 183         if (strlen(default_mode_str) != 0) {
 184                 mode = strtol(default_mode_str, NULL, 8);
 185         }
 186         return mode;
 187 }
 188
 189 static void apply_format(struct udevice *udev, unsigned char *string)
 190 {
 191         char name[NAME_SIZE];
 192         char temp[NAME_SIZE];
 193         char *tail;
 194         char *pos;
 195         char *pos2;
 196         char *pos3;
 197         int num;
 198
 199         while (1) {
 200                 num = 0;
 201                 pos = strchr(string, '%');
 202
 203                 if (pos) {
 204                         *pos = '\0';
 205                         tail = pos+1;
 206                         if (isdigit(tail[0])) {
 207                                 num = (int) strtoul(&pos[1], &tail, 10);
 208                                 if (tail == NULL) {
 209                                         dbg("format parsing error '%s'", pos+1);
 210                                         break;
 211                                 }
 212                         }
 213                         strfieldcpy(name, tail+1);
 214
 215                         switch (tail[0]) {
 216                         case 'b':
 217                                 if (strlen(udev->bus_id) == 0)
 218                                         break;
 219                                 strcat(pos, udev->bus_id);
 220                                 dbg("substitute bus_id '%s'", udev->bus_id);
 221                                 break;
 222                         case 'k':
 223                                 if (strlen(udev->kernel_name) == 0)
 224                                         break;
 225                                 strcat(pos, udev->kernel_name);
 226                                 dbg("substitute kernel name '%s'", udev->kernel_name);
 227                                 break;
 228                         case 'n':
 229                                 if (strlen(udev->kernel_number) == 0)
 230                                         break;
 231                                 strcat(pos, udev->kernel_number);
 232                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 233                                 break;
 234                         case 'D':
 235                                 if (strlen(udev->kernel_number) == 0) {
 236                                         strcat(pos, "disc");
 237                                         break;
 238                                 }
 239                                 strcat(pos, "part");
 240                                 strcat(pos, udev->kernel_number);
 241                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 242                                 break;
 243                         case 'm':
 244                                 sprintf(pos, "%u", udev->minor);
 245                                 dbg("substitute minor number '%u'", udev->minor);
 246                                 break;
 247                         case 'M':
 248                                 sprintf(pos, "%u", udev->major);
 249                                 dbg("substitute major number '%u'", udev->major);
 250                                 break;
 251                         case 'c':
 252                                 if (strlen(udev->callout_value) == 0)
 253                                         break;
 254                                 if (num) {
 255                                         /* get part of return string */
 256                                         strncpy(temp, udev->callout_value, sizeof(temp));
 257                                         pos2 = temp;
 258                                         while (num) {
 259                                                 num--;
 260                                                 pos3 = strsep(&pos2, " ");
 261                                                 if (pos3 == NULL) {
 262                                                         dbg("requested part of callout string not found");
 263                                                         break;
 264                                                 }
 265                                         }
 266                                         strcat(pos, pos3);
 267                                         dbg("substitute partial callout output '%s'", pos3);
 268                                 } else {
 269                                         strcat(pos, udev->callout_value);
 270                                         dbg("substitute callout output '%s'", udev->callout_value);
 271                                 }
 272                                 break;
 273                         default:
 274                                 dbg("unknown substitution type '%%%c'", pos[1]);
 275                                 break;
 276                         }
 277                         strcat(string, name);
 278                 } else
 279                         break;
 280         }
 281 }
 282
 283 static struct bus_file {
 284         char *bus;
 285         char *file;
 286 } bus_files[] = {
 287         { .bus = "scsi",        .file = "vendor" },
 288         { .bus = "usb",         .file = "idVendor" },
 289         {}
 290 };
 291
 292 #define SECONDS_TO_WAIT_FOR_FILE        10
 293 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
 294 {
 295         /* sleep until we see the file for this specific bus type show up this
 296          * is needed because we can easily out-run the kernel in looking for
 297          * these files before the paticular subsystem has created them in the
 298          * sysfs tree properly.
 299          *
 300          * And people thought that the /sbin/hotplug event system was going to
 301          * be slow, poo on you for arguing that before even testing it...
 302          */
 303         struct bus_file *b = &bus_files[0];
 304         struct sysfs_attribute *tmpattr;
 305         int loop;
 306
 307         while (1) {
 308                 if (b->bus == NULL)
 309                         break;
 310                 if (strcmp(sysfs_device->bus, b->bus) == 0) {
 311                         tmpattr = NULL;
 312                         loop = SECONDS_TO_WAIT_FOR_FILE;
 313                         while (loop--) {
 314                                 dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
 315                                 tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
 316                                 if (tmpattr) {
 317                                         /* found it! */
 318                                         goto exit;
 319                                 }
 320                                 /* sleep to give the kernel a chance to create the file */
 321                                 sleep(1);
 322                         }
 323                         dbg("Timed out waiting for '%s' file, continuing on anyway...", b->file);
 324                         goto exit;
 325                 }
 326                 b++;
 327         }
 328         dbg("Did not find bus type '%s' on list of bus_id_files, contact greg@kroah.com", sysfs_device->bus);
 329 exit:
 330         return; /* here to prevent compiler warning... */
 331 }
 332
 333 static int exec_callout(struct config_device *dev, char *value, int len)
 334 {
 335         int retval;
 336         int res;
 337         int status;
 338         int fds[2];
 339         pid_t pid;
 340         int value_set = 0;
 341         char buffer[256];
 342         char *pos;
 343         char *args[CALLOUT_MAXARG];
 344         int i;
 345
 346         dbg("callout to '%s'", dev->exec_program);
 347         retval = pipe(fds);
 348         if (retval != 0) {
 349                 dbg("pipe failed");
 350                 return -1;
 351         }
 352         pid = fork();
 353         if (pid == -1) {
 354                 dbg("fork failed");
 355                 return -1;
 356         }
 357
 358         if (pid == 0) {
 359                 /* child */
 360                 close(STDOUT_FILENO);
 361                 dup(fds[1]);    /* dup write side of pipe to STDOUT */
 362                 if (strchr(dev->exec_program, ' ')) {
 363                         /* callout with arguments */
 364                         pos = dev->exec_program;
 365                         for (i=0; i < CALLOUT_MAXARG-1; i++) {
 366                                 args[i] = strsep(&pos, " ");
 367                                 if (args[i] == NULL)
 368                                         break;
 369                         }
 370                         if (args[i]) {
 371                                 dbg("too many args - %d", i);
 372                                 args[i] = NULL;
 373                         }
 374                         retval = execve(args[0], args, main_envp);
 375                 } else {
 376                         retval = execve(dev->exec_program, main_argv, main_envp);
 377                 }
 378                 if (retval != 0) {
 379                         dbg("child execve failed");
 380                         exit(1);
 381                 }
 382                 return -1; /* avoid compiler warning */
 383         } else {
 384                 /* parent reads from fds[0] */
 385                 close(fds[1]);
 386                 retval = 0;
 387                 while (1) {
 388                         res = read(fds[0], buffer, sizeof(buffer) - 1);
 389                         if (res <= 0)
 390                                 break;
 391                         buffer[res] = '\0';
 392                         if (res > len) {
 393                                 dbg("callout len %d too short", len);
 394                                 retval = -1;
 395                         }
 396                         if (value_set) {
 397                                 dbg("callout value already set");
 398                                 retval = -1;
 399                         } else {
 400                                 value_set = 1;
 401                                 strncpy(value, buffer, len);
 402                                 pos = value + strlen(value)-1;
 403                                 if (pos[0] == '\n')
 404                                 pos[0] = '\0';
 405                                 dbg("callout returned '%s'", value);
 406                         }
 407                 }
 408                 close(fds[0]);
 409                 res = wait(&status);
 410                 if (res < 0) {
 411                         dbg("wait failed result %d", res);
 412                         retval = -1;
 413                 }
 414
 415 #ifndef __KLIBC__
 416                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 417                         dbg("callout program status 0x%x", status);
 418                         retval = -1;
 419                 }
 420 #endif
 421         }
 422         return retval;
 423 }
 424
 425 static int do_callout(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 426 {
 427         struct config_device *dev;
 428         struct list_head *tmp;
 429
 430         list_for_each(tmp, &config_device_list) {
 431                 dev = list_entry(tmp, struct config_device, node);
 432                 if (dev->type != CALLOUT)
 433                         continue;
 434
 435                 if (sysfs_device) {
 436                         dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 437                         if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 438                                 continue;
 439                 }
 440
 441                 /* substitute anything that needs to be in the program name */
 442                 apply_format(udev, dev->exec_program);
 443                 if (exec_callout(dev, udev->callout_value, NAME_SIZE))
 444                         continue;
 445                 if (strcmp_pattern(dev->id, udev->callout_value) != 0)
 446                         continue;
 447                 strfieldcpy(udev->name, dev->name);
 448                 strfieldcpy(udev->symlink, dev->symlink);
 449                 dbg("callout returned matching value '%s', '%s' becomes '%s'",
 450                     dev->id, class_dev->name, udev->name);
 451                 return 0;
 452         }
 453         return -ENODEV;
 454 }
 455
 456 static int do_label(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 457 {
 458         struct sysfs_attribute *tmpattr = NULL;
 459         struct config_device *dev;
 460         struct list_head *tmp;
 461         char *c;
 462
 463         list_for_each(tmp, &config_device_list) {
 464                 dev = list_entry(tmp, struct config_device, node);
 465                 if (dev->type != LABEL)
 466                         continue;
 467
 468                 if (sysfs_device) {
 469                         dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 470                         if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 471                                 continue;
 472                 }
 473
 474                 dbg("look for device attribute '%s'", dev->sysfs_file);
 475                 /* try to find the attribute in the class device directory */
 476                 tmpattr = sysfs_get_classdev_attr(class_dev, dev->sysfs_file);
 477                 if (tmpattr)
 478                         goto label_found;
 479
 480                 /* look in the class device directory if present */
 481                 if (sysfs_device) {
 482                         tmpattr = sysfs_get_device_attr(sysfs_device, dev->sysfs_file);
 483                         if (tmpattr)
 484                                 goto label_found;
 485                 }
 486
 487                 continue;
 488
 489 label_found:
 490                 c = tmpattr->value + strlen(tmpattr->value)-1;
 491                 if (*c == '\n')
 492                         *c = 0x00;
 493                 dbg("compare attribute '%s' value '%s' with '%s'",
 494                           dev->sysfs_file, tmpattr->value, dev->sysfs_value);
 495                 if (strcmp_pattern(dev->sysfs_value, tmpattr->value) != 0)
 496                         continue;
 497
 498                 strfieldcpy(udev->name, dev->name);
 499                 strfieldcpy(udev->symlink, dev->symlink);
 500                 dbg("found matching attribute '%s', '%s' becomes '%s' ",
 501                     dev->sysfs_file, class_dev->name, udev->name);
 502
 503                 return 0;
 504         }
 505         return -ENODEV;
 506 }
 507
 508 static int do_number(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 509 {
 510         struct config_device *dev;
 511         struct list_head *tmp;
 512         char path[SYSFS_PATH_MAX];
 513         int found;
 514         char *temp = NULL;
 515
 516         /* we have to have a sysfs device for NUMBER to work */
 517         if (!sysfs_device)
 518                 return -ENODEV;
 519
 520         list_for_each(tmp, &config_device_list) {
 521                 dev = list_entry(tmp, struct config_device, node);
 522                 if (dev->type != NUMBER)
 523                         continue;
 524
 525                 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 526                 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 527                         continue;
 528
 529                 found = 0;
 530                 strfieldcpy(path, sysfs_device->path);
 531                 temp = strrchr(path, '/');
 532                 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 533                 if (strstr(temp, dev->id) != NULL) {
 534                         found = 1;
 535                 } else {
 536                         *temp = 0x00;
 537                         temp = strrchr(path, '/');
 538                         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 539                         if (strstr(temp, dev->id) != NULL)
 540                                 found = 1;
 541                 }
 542                 if (!found)
 543                         continue;
 544                 strfieldcpy(udev->name, dev->name);
 545                 strfieldcpy(udev->symlink, dev->symlink);
 546                 dbg("found matching id '%s', '%s' becomes '%s'",
 547                     dev->id, class_dev->name, udev->name);
 548                 return 0;
 549         }
 550         return -ENODEV;
 551 }
 552
 553 static int do_topology(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 554 {
 555         struct config_device *dev;
 556         struct list_head *tmp;
 557         char path[SYSFS_PATH_MAX];
 558         int found;
 559         char *temp = NULL;
 560
 561         /* we have to have a sysfs device for TOPOLOGY to work */
 562         if (!sysfs_device)
 563                 return -ENODEV;
 564
 565         list_for_each(tmp, &config_device_list) {
 566                 dev = list_entry(tmp, struct config_device, node);
 567                 if (dev->type != TOPOLOGY)
 568                         continue;
 569
 570                 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 571                 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 572                         continue;
 573
 574                 found = 0;
 575                 strfieldcpy(path, sysfs_device->path);
 576                 temp = strrchr(path, '/');
 577                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 578                 if (strstr(temp, dev->place) != NULL) {
 579                         found = 1;
 580                 } else {
 581                         *temp = 0x00;
 582                         temp = strrchr(path, '/');
 583                         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 584                         if (strstr(temp, dev->place) != NULL)
 585                                 found = 1;
 586                 }
 587                 if (!found)
 588                         continue;
 589
 590                 strfieldcpy(udev->name, dev->name);
 591                 strfieldcpy(udev->symlink, dev->symlink);
 592                 dbg("found matching place '%s', '%s' becomes '%s'",
 593                     dev->place, class_dev->name, udev->name);
 594                 return 0;
 595         }
 596         return -ENODEV;
 597 }
 598
 599 static int do_replace(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 600 {
 601         struct config_device *dev;
 602         struct list_head *tmp;
 603
 604         list_for_each(tmp, &config_device_list) {
 605                 dev = list_entry(tmp, struct config_device, node);
 606                 if (dev->type != REPLACE)
 607                         continue;
 608
 609                 dbg("compare name '%s' with '%s'", dev->kernel_name, class_dev->name);
 610                 if (strcmp_pattern(dev->kernel_name, class_dev->name) != 0)
 611                         continue;
 612
 613                 strfieldcpy(udev->name, dev->name);
 614                 strfieldcpy(udev->symlink, dev->symlink);
 615                 dbg("found name, '%s' becomes '%s'", dev->kernel_name, udev->name);
 616
 617                 return 0;
 618         }
 619         return -ENODEV;
 620 }
 621
 622 static void do_kernelname(struct sysfs_class_device *class_dev, struct udevice *udev)
 623 {
 624         /* heh, this is pretty simple... */
 625         strfieldcpy(udev->name, class_dev->name);
 626 }
 627
 628 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
 629 {
 630         struct sysfs_device *sysfs_device;
 631         struct sysfs_class_device *class_dev_parent;
 632         int loop;
 633
 634         /* FIXME!!! */
 635         /* This is needed here as we can easily out-race the placement of the
 636          * device symlink by the kernel.  The call to sleep(1); will be removed
 637          * once libsysfs can be queried for sysfs_get_classdev_device()
 638          * multiple times and have it return the proper information when the
 639          * class device really shows up.  For now, we live with the time
 640          * delay...
 641          */
 642         sleep(1);
 643
 644 #if 0   /* FIXME
 645            Something like this could also work, but for some reason doesn't,
 646            I also tried just stat() on the device symlink, but that still
 647            has nasty races, I'm probably doing something stupid... :( */
 648         loop = 10;
 649         while (loop--) {
 650                 struct stat buf;
 651                 int retval;
 652                 char filename[SYSFS_PATH_MAX + 6];
 653
 654                 strcpy(filename, class_dev->path);
 655                 strcat(filename, "/device");
 656                 dbg("looking for '%s'", filename);
 657                 retval = stat(filename, &buf);
 658                 if (!retval)
 659                         break;
 660
 661                 /* bah, let's go backwards up a level to see if the device is there,
 662                  * as block partitions don't point to the physical device.  Need to fix that
 663                  * up in the kernel...
 664                  */
 665                 if (strcmp(class_dev->classname, SYSFS_BLOCK_NAME) == 0) {
 666                         if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
 667                                 class_dev_parent = sysfs_get_classdev_parent(class_dev);
 668                                 if (class_dev_parent == NULL) {
 669                                         dbg("sysfs_get_classdev_parent for class device '%s' failed", class_dev->name);
 670                                 } else {
 671                                         strcpy(filename, class_dev_parent->path);
 672                                         strcat(filename, "/device");
 673                                         dbg("looking for '%s'", filename);
 674                                         retval = stat(filename, &buf);
 675                                         if (!retval)
 676                                                 break;
 677                                 }
 678                         }
 679                 }
 680                 /* sleep to give the kernel a chance to create the device file */
 681                 sleep(1);
 682         }
 683 #endif
 684         loop = 1;       /* FIXME put a real value in here for when everything is fixed... */
 685         while (loop--) {
 686                 /* find the sysfs_device for this class device */
 687                 /* Wouldn't it really be nice if libsysfs could do this for us? */
 688                 sysfs_device = sysfs_get_classdev_device(class_dev);
 689                 if (sysfs_device != NULL)
 690                         goto exit;
 691
 692                 /* bah, let's go backwards up a level to see if the device is there,
 693                  * as block partitions don't point to the physical device.  Need to fix that
 694                  * up in the kernel...
 695                  */
 696                 if (strcmp(class_dev->classname, SYSFS_BLOCK_NAME) == 0) {
 697                         dbg("looking at block device");
 698                         if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
 699                                 dbg("really is a partition");
 700                                 class_dev_parent = sysfs_get_classdev_parent(class_dev);
 701                                 if (class_dev_parent == NULL) {
 702                                         dbg("sysfs_get_classdev_parent for class device '%s' failed", class_dev->name);
 703                                 } else {
 704                                         dbg("class_dev_parent->name='%s'", class_dev_parent->name);
 705                                         sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 706                                         if (sysfs_device != NULL)
 707                                                 goto exit;
 708                                 }
 709                         }
 710                 }
 711                 /* sleep to give the kernel a chance to create the link */
 712                 sleep(1);
 713
 714         }
 715         dbg("Timed out waiting for device symlink, continuing on anyway...");
 716 exit:
 717         return sysfs_device;
 718 }
 719
 720 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 721 {
 722         struct sysfs_device *sysfs_device = NULL;
 723         struct sysfs_class_device *class_dev_parent = NULL;
 724         int retval = 0;
 725         struct perm_device *perm;
 726         char *pos;
 727
 728         udev->mode = 0;
 729
 730         /* find the sysfs_device associated with this class device */
 731         sysfs_device = get_sysfs_device(class_dev);
 732         if (sysfs_device) {
 733                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 734                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 735                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 736                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 737                 wait_for_device_to_initialize(sysfs_device);
 738         } else {
 739                 dbg("class_dev->name = '%s'", class_dev->name);
 740         }
 741
 742         strfieldcpy(udev->kernel_name, class_dev->name);
 743
 744         /* get kernel number */
 745         pos = class_dev->name + strlen(class_dev->name);
 746         while (isdigit(*(pos-1)))
 747                 pos--;
 748         strfieldcpy(udev->kernel_number, pos);
 749         dbg("kernel_number='%s'", udev->kernel_number);
 750
 751         /* rules are looked at in priority order */
 752         retval = do_callout(class_dev, udev, sysfs_device);
 753         if (retval == 0)
 754                 goto found;
 755
 756         retval = do_label(class_dev, udev, sysfs_device);
 757         if (retval == 0)
 758                 goto found;
 759
 760         retval = do_number(class_dev, udev, sysfs_device);
 761         if (retval == 0)
 762                 goto found;
 763
 764         retval = do_topology(class_dev, udev, sysfs_device);
 765         if (retval == 0)
 766                 goto found;
 767
 768         retval = do_replace(class_dev, udev, sysfs_device);
 769         if (retval == 0)
 770                 goto found;
 771
 772         do_kernelname(class_dev, udev);
 773         goto done;
 774
 775 found:
 776         /* substitute placeholder */
 777         apply_format(udev, udev->name);
 778         apply_format(udev, udev->symlink);
 779
 780 done:
 781         perm = find_perm(udev->name);
 782         if (perm) {
 783                 udev->mode = perm->mode;
 784                 strfieldcpy(udev->owner, perm->owner);
 785                 strfieldcpy(udev->group, perm->group);
 786         } else {
 787                 /* no matching perms found :( */
 788                 udev->mode = get_default_mode(class_dev);
 789                 udev->owner[0] = 0x00;
 790                 udev->group[0] = 0x00;
 791         }
 792         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 793             udev->name, udev->owner, udev->group, udev->mode);
 794
 795         return 0;
 796 }
 797
 798 int namedev_init(void)
 799 {
 800         int retval;
 801
 802         retval = namedev_init_rules();
 803         if (retval)
 804                 return retval;
 805
 806         retval = namedev_init_permissions();
 807         if (retval)
 808                 return retval;
 809
 810         dump_config_dev_list();
 811         dump_perm_dev_list();
 812         return retval;
 813 }