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_perm_dev(struct perm_device *new_dev)
 106 {
 107         struct list_head *tmp;
 108         struct perm_device *tmp_dev;
 109
 110         /* update the values if we already have the device */
 111         list_for_each(tmp, &perm_device_list) {
 112                 struct perm_device *dev = list_entry(tmp, struct perm_device, node);
 113                 if (strcmp_pattern(new_dev->name, dev->name))
 114                         continue;
 115                 copy_var(dev, new_dev, mode);
 116                 copy_string(dev, new_dev, owner);
 117                 copy_string(dev, new_dev, group);
 118                 return 0;
 119         }
 120
 121         /* not found, add new structure to the perm list */
 122         tmp_dev = malloc(sizeof(*tmp_dev));
 123         if (!tmp_dev)
 124                 return -ENOMEM;
 125         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 126         list_add_tail(&tmp_dev->node, &perm_device_list);
 127         //dump_perm_dev(tmp_dev);
 128         return 0;
 129 }
 130
 131 static struct perm_device *find_perm(char *name)
 132 {
 133         struct list_head *tmp;
 134         struct perm_device *perm = NULL;
 135
 136         list_for_each(tmp, &perm_device_list) {
 137                 perm = list_entry(tmp, struct perm_device, node);
 138                 if (strcmp_pattern(perm->name, name))
 139                         continue;
 140                 return perm;
 141         }
 142         return NULL;
 143 }
 144
 145 static mode_t get_default_mode(struct sysfs_class_device *class_dev)
 146 {
 147         mode_t mode = 0600;     /* default to owner rw only */
 148
 149         if (strlen(default_mode_str) != 0) {
 150                 mode = strtol(default_mode_str, NULL, 8);
 151         }
 152         return mode;
 153 }
 154
 155 static void apply_format(struct udevice *udev, unsigned char *string)
 156 {
 157         char name[NAME_SIZE];
 158         char temp[NAME_SIZE];
 159         char *tail;
 160         char *pos;
 161         char *pos2;
 162         char *pos3;
 163         int num;
 164
 165         while (1) {
 166                 num = 0;
 167                 pos = strchr(string, '%');
 168
 169                 if (pos) {
 170                         *pos = '\0';
 171                         tail = pos+1;
 172                         if (isdigit(tail[0])) {
 173                                 num = (int) strtoul(&pos[1], &tail, 10);
 174                                 if (tail == NULL) {
 175                                         dbg("format parsing error '%s'", pos+1);
 176                                         break;
 177                                 }
 178                         }
 179                         strfieldcpy(name, tail+1);
 180
 181                         switch (tail[0]) {
 182                         case 'b':
 183                                 if (strlen(udev->bus_id) == 0)
 184                                         break;
 185                                 strcat(pos, udev->bus_id);
 186                                 dbg("substitute bus_id '%s'", udev->bus_id);
 187                                 break;
 188                         case 'k':
 189                                 if (strlen(udev->kernel_name) == 0)
 190                                         break;
 191                                 strcat(pos, udev->kernel_name);
 192                                 dbg("substitute kernel name '%s'", udev->kernel_name);
 193                                 break;
 194                         case 'n':
 195                                 if (strlen(udev->kernel_number) == 0)
 196                                         break;
 197                                 strcat(pos, udev->kernel_number);
 198                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 199                                 break;
 200                         case 'D':
 201                                 if (strlen(udev->kernel_number) == 0) {
 202                                         strcat(pos, "disc");
 203                                         break;
 204                                 }
 205                                 strcat(pos, "part");
 206                                 strcat(pos, udev->kernel_number);
 207                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 208                                 break;
 209                         case 'm':
 210                                 sprintf(pos, "%u", udev->minor);
 211                                 dbg("substitute minor number '%u'", udev->minor);
 212                                 break;
 213                         case 'M':
 214                                 sprintf(pos, "%u", udev->major);
 215                                 dbg("substitute major number '%u'", udev->major);
 216                                 break;
 217                         case 'c':
 218                                 if (strlen(udev->callout_value) == 0)
 219                                         break;
 220                                 if (num) {
 221                                         /* get part of return string */
 222                                         strncpy(temp, udev->callout_value, sizeof(temp));
 223                                         pos2 = temp;
 224                                         while (num) {
 225                                                 num--;
 226                                                 pos3 = strsep(&pos2, " ");
 227                                                 if (pos3 == NULL) {
 228                                                         dbg("requested part of callout string not found");
 229                                                         break;
 230                                                 }
 231                                         }
 232                                         strcat(pos, pos3);
 233                                         dbg("substitute partial callout output '%s'", pos3);
 234                                 } else {
 235                                         strcat(pos, udev->callout_value);
 236                                         dbg("substitute callout output '%s'", udev->callout_value);
 237                                 }
 238                                 break;
 239                         default:
 240                                 dbg("unknown substitution type '%%%c'", pos[1]);
 241                                 break;
 242                         }
 243                         strcat(string, name);
 244                 } else
 245                         break;
 246         }
 247 }
 248
 249 static struct bus_file {
 250         char *bus;
 251         char *file;
 252 } bus_files[] = {
 253         { .bus = "scsi",        .file = "vendor" },
 254         { .bus = "usb",         .file = "idVendor" },
 255         {}
 256 };
 257
 258 #define SECONDS_TO_WAIT_FOR_FILE        10
 259 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
 260 {
 261         /* sleep until we see the file for this specific bus type show up this
 262          * is needed because we can easily out-run the kernel in looking for
 263          * these files before the paticular subsystem has created them in the
 264          * sysfs tree properly.
 265          *
 266          * And people thought that the /sbin/hotplug event system was going to
 267          * be slow, poo on you for arguing that before even testing it...
 268          */
 269         struct bus_file *b = &bus_files[0];
 270         struct sysfs_attribute *tmpattr;
 271         int loop;
 272
 273         while (1) {
 274                 if (b->bus == NULL)
 275                         break;
 276                 if (strcmp(sysfs_device->bus, b->bus) == 0) {
 277                         tmpattr = NULL;
 278                         loop = SECONDS_TO_WAIT_FOR_FILE;
 279                         while (loop--) {
 280                                 dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
 281                                 tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
 282                                 if (tmpattr) {
 283                                         /* found it! */
 284                                         goto exit;
 285                                 }
 286                                 /* sleep to give the kernel a chance to create the file */
 287                                 sleep(1);
 288                         }
 289                         dbg("Timed out waiting for '%s' file, continuing on anyway...", b->file);
 290                         goto exit;
 291                 }
 292                 b++;
 293         }
 294         dbg("Did not find bus type '%s' on list of bus_id_files, contact greg@kroah.com", sysfs_device->bus);
 295 exit:
 296         return; /* here to prevent compiler warning... */
 297 }
 298
 299 static int exec_callout(struct config_device *dev, char *value, int len)
 300 {
 301         int retval;
 302         int res;
 303         int status;
 304         int fds[2];
 305         pid_t pid;
 306         int value_set = 0;
 307         char buffer[256];
 308         char *pos;
 309         char *args[CALLOUT_MAXARG];
 310         int i;
 311
 312         dbg("callout to '%s'", dev->exec_program);
 313         retval = pipe(fds);
 314         if (retval != 0) {
 315                 dbg("pipe failed");
 316                 return -1;
 317         }
 318         pid = fork();
 319         if (pid == -1) {
 320                 dbg("fork failed");
 321                 return -1;
 322         }
 323
 324         if (pid == 0) {
 325                 /* child */
 326                 close(STDOUT_FILENO);
 327                 dup(fds[1]);    /* dup write side of pipe to STDOUT */
 328                 if (strchr(dev->exec_program, ' ')) {
 329                         /* callout with arguments */
 330                         pos = dev->exec_program;
 331                         for (i=0; i < CALLOUT_MAXARG-1; i++) {
 332                                 args[i] = strsep(&pos, " ");
 333                                 if (args[i] == NULL)
 334                                         break;
 335                         }
 336                         if (args[i]) {
 337                                 dbg("too many args - %d", i);
 338                                 args[i] = NULL;
 339                         }
 340                         retval = execve(args[0], args, main_envp);
 341                 } else {
 342                         retval = execve(dev->exec_program, main_argv, main_envp);
 343                 }
 344                 if (retval != 0) {
 345                         dbg("child execve failed");
 346                         exit(1);
 347                 }
 348                 return -1; /* avoid compiler warning */
 349         } else {
 350                 /* parent reads from fds[0] */
 351                 close(fds[1]);
 352                 retval = 0;
 353                 while (1) {
 354                         res = read(fds[0], buffer, sizeof(buffer) - 1);
 355                         if (res <= 0)
 356                                 break;
 357                         buffer[res] = '\0';
 358                         if (res > len) {
 359                                 dbg("callout len %d too short", len);
 360                                 retval = -1;
 361                         }
 362                         if (value_set) {
 363                                 dbg("callout value already set");
 364                                 retval = -1;
 365                         } else {
 366                                 value_set = 1;
 367                                 strncpy(value, buffer, len);
 368                                 pos = value + strlen(value)-1;
 369                                 if (pos[0] == '\n')
 370                                 pos[0] = '\0';
 371                                 dbg("callout returned '%s'", value);
 372                         }
 373                 }
 374                 close(fds[0]);
 375                 res = wait(&status);
 376                 if (res < 0) {
 377                         dbg("wait failed result %d", res);
 378                         retval = -1;
 379                 }
 380
 381 #ifndef __KLIBC__
 382                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 383                         dbg("callout program status 0x%x", status);
 384                         retval = -1;
 385                 }
 386 #endif
 387         }
 388         return retval;
 389 }
 390
 391 static int do_callout(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 392 {
 393         struct config_device *dev;
 394         struct list_head *tmp;
 395
 396         list_for_each(tmp, &config_device_list) {
 397                 dev = list_entry(tmp, struct config_device, node);
 398                 if (dev->type != CALLOUT)
 399                         continue;
 400
 401                 if (sysfs_device) {
 402                         dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 403                         if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 404                                 continue;
 405                 }
 406
 407                 /* substitute anything that needs to be in the program name */
 408                 apply_format(udev, dev->exec_program);
 409                 if (exec_callout(dev, udev->callout_value, NAME_SIZE))
 410                         continue;
 411                 if (strcmp_pattern(dev->id, udev->callout_value) != 0)
 412                         continue;
 413                 strfieldcpy(udev->name, dev->name);
 414                 strfieldcpy(udev->symlink, dev->symlink);
 415                 dbg("callout returned matching value '%s', '%s' becomes '%s'",
 416                     dev->id, class_dev->name, udev->name);
 417                 return 0;
 418         }
 419         return -ENODEV;
 420 }
 421
 422 static int match_pair(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
 423 {
 424         struct sysfs_attribute *tmpattr = NULL;
 425         char *c;
 426
 427         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
 428                 return -ENODEV;
 429
 430         dbg("look for device attribute '%s'", pair->file);
 431         /* try to find the attribute in the class device directory */
 432         tmpattr = sysfs_get_classdev_attr(class_dev, pair->file);
 433         if (tmpattr)
 434                 goto label_found;
 435
 436         /* look in the class device directory if present */
 437         if (sysfs_device) {
 438                 tmpattr = sysfs_get_device_attr(sysfs_device, pair->file);
 439                 if (tmpattr)
 440                         goto label_found;
 441         }
 442
 443         return -ENODEV;
 444
 445 label_found:
 446         c = tmpattr->value + strlen(tmpattr->value)-1;
 447         if (*c == '\n')
 448                 *c = 0x00;
 449         dbg("compare attribute '%s' value '%s' with '%s'",
 450                   pair->file, tmpattr->value, pair->value);
 451         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 452                 return -ENODEV;
 453
 454         dbg("found matching attribute '%s' with value '%s'",
 455             pair->file, pair->value);
 456         return 0;
 457 }
 458
 459 static int do_label(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 460 {
 461         struct sysfs_pair *pair;
 462         struct config_device *dev;
 463         struct list_head *tmp;
 464         int i;
 465         int match;
 466
 467         list_for_each(tmp, &config_device_list) {
 468                 dev = list_entry(tmp, struct config_device, node);
 469                 if (dev->type != LABEL)
 470                         continue;
 471
 472                 if (sysfs_device) {
 473                         dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 474                         if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 475                                 continue;
 476                 }
 477
 478                 match = 1;
 479                 for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
 480                         pair = &dev->sysfs_pair[i];
 481                         if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
 482                                 break;
 483                         if (match_pair(class_dev, sysfs_device, pair) != 0) {
 484                                 match = 0;
 485                                 break;
 486                         }
 487                 }
 488                 if (match == 0)
 489                         continue;
 490
 491                 /* found match */
 492                 strfieldcpy(udev->name, dev->name);
 493                 strfieldcpy(udev->symlink, dev->symlink);
 494                 dbg("found matching attribute, '%s' becomes '%s' ",
 495                     class_dev->name, udev->name);
 496
 497                 return 0;
 498         }
 499         return -ENODEV;
 500 }
 501
 502 static int do_number(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 503 {
 504         struct config_device *dev;
 505         struct list_head *tmp;
 506         char path[SYSFS_PATH_MAX];
 507         int found;
 508         char *temp = NULL;
 509
 510         /* we have to have a sysfs device for NUMBER to work */
 511         if (!sysfs_device)
 512                 return -ENODEV;
 513
 514         list_for_each(tmp, &config_device_list) {
 515                 dev = list_entry(tmp, struct config_device, node);
 516                 if (dev->type != NUMBER)
 517                         continue;
 518
 519                 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 520                 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 521                         continue;
 522
 523                 found = 0;
 524                 strfieldcpy(path, sysfs_device->path);
 525                 temp = strrchr(path, '/');
 526                 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 527                 if (strstr(temp, dev->id) != NULL) {
 528                         found = 1;
 529                 } else {
 530                         *temp = 0x00;
 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                 }
 536                 if (!found)
 537                         continue;
 538                 strfieldcpy(udev->name, dev->name);
 539                 strfieldcpy(udev->symlink, dev->symlink);
 540                 dbg("found matching id '%s', '%s' becomes '%s'",
 541                     dev->id, class_dev->name, udev->name);
 542                 return 0;
 543         }
 544         return -ENODEV;
 545 }
 546
 547 static int do_topology(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 548 {
 549         struct config_device *dev;
 550         struct list_head *tmp;
 551         char path[SYSFS_PATH_MAX];
 552         int found;
 553         char *temp = NULL;
 554
 555         /* we have to have a sysfs device for TOPOLOGY to work */
 556         if (!sysfs_device)
 557                 return -ENODEV;
 558
 559         list_for_each(tmp, &config_device_list) {
 560                 dev = list_entry(tmp, struct config_device, node);
 561                 if (dev->type != TOPOLOGY)
 562                         continue;
 563
 564                 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 565                 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 566                         continue;
 567
 568                 found = 0;
 569                 strfieldcpy(path, sysfs_device->path);
 570                 temp = strrchr(path, '/');
 571                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 572                 if (strstr(temp, dev->place) != NULL) {
 573                         found = 1;
 574                 } else {
 575                         *temp = 0x00;
 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                 }
 581                 if (!found)
 582                         continue;
 583
 584                 strfieldcpy(udev->name, dev->name);
 585                 strfieldcpy(udev->symlink, dev->symlink);
 586                 dbg("found matching place '%s', '%s' becomes '%s'",
 587                     dev->place, class_dev->name, udev->name);
 588                 return 0;
 589         }
 590         return -ENODEV;
 591 }
 592
 593 static int do_replace(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 594 {
 595         struct config_device *dev;
 596         struct list_head *tmp;
 597
 598         list_for_each(tmp, &config_device_list) {
 599                 dev = list_entry(tmp, struct config_device, node);
 600                 if (dev->type != REPLACE)
 601                         continue;
 602
 603                 dbg("compare name '%s' with '%s'", dev->kernel_name, class_dev->name);
 604                 if (strcmp_pattern(dev->kernel_name, class_dev->name) != 0)
 605                         continue;
 606
 607                 strfieldcpy(udev->name, dev->name);
 608                 strfieldcpy(udev->symlink, dev->symlink);
 609                 dbg("found name, '%s' becomes '%s'", dev->kernel_name, udev->name);
 610
 611                 return 0;
 612         }
 613         return -ENODEV;
 614 }
 615
 616 static void do_kernelname(struct sysfs_class_device *class_dev, struct udevice *udev)
 617 {
 618         /* heh, this is pretty simple... */
 619         strfieldcpy(udev->name, class_dev->name);
 620 }
 621
 622 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
 623 {
 624         struct sysfs_device *sysfs_device;
 625         struct sysfs_class_device *class_dev_parent;
 626         int loop;
 627
 628         /* FIXME!!! */
 629         /* This is needed here as we can easily out-race the placement of the
 630          * device symlink by the kernel.  The call to sleep(1); will be removed
 631          * once libsysfs can be queried for sysfs_get_classdev_device()
 632          * multiple times and have it return the proper information when the
 633          * class device really shows up.  For now, we live with the time
 634          * delay...
 635          */
 636         sleep(1);
 637
 638 #if 0   /* FIXME
 639            Something like this could also work, but for some reason doesn't,
 640            I also tried just stat() on the device symlink, but that still
 641            has nasty races, I'm probably doing something stupid... :( */
 642         loop = 10;
 643         while (loop--) {
 644                 struct stat buf;
 645                 int retval;
 646                 char filename[SYSFS_PATH_MAX + 6];
 647
 648                 strcpy(filename, class_dev->path);
 649                 strcat(filename, "/device");
 650                 dbg("looking for '%s'", filename);
 651                 retval = stat(filename, &buf);
 652                 if (!retval)
 653                         break;
 654
 655                 /* bah, let's go backwards up a level to see if the device is there,
 656                  * as block partitions don't point to the physical device.  Need to fix that
 657                  * up in the kernel...
 658                  */
 659                 if (strcmp(class_dev->classname, SYSFS_BLOCK_NAME) == 0) {
 660                         if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
 661                                 class_dev_parent = sysfs_get_classdev_parent(class_dev);
 662                                 if (class_dev_parent == NULL) {
 663                                         dbg("sysfs_get_classdev_parent for class device '%s' failed", class_dev->name);
 664                                 } else {
 665                                         strcpy(filename, class_dev_parent->path);
 666                                         strcat(filename, "/device");
 667                                         dbg("looking for '%s'", filename);
 668                                         retval = stat(filename, &buf);
 669                                         if (!retval)
 670                                                 break;
 671                                 }
 672                         }
 673                 }
 674                 /* sleep to give the kernel a chance to create the device file */
 675                 sleep(1);
 676         }
 677 #endif
 678         loop = 1;       /* FIXME put a real value in here for when everything is fixed... */
 679         while (loop--) {
 680                 /* find the sysfs_device for this class device */
 681                 /* Wouldn't it really be nice if libsysfs could do this for us? */
 682                 sysfs_device = sysfs_get_classdev_device(class_dev);
 683                 if (sysfs_device != NULL)
 684                         goto exit;
 685
 686                 /* bah, let's go backwards up a level to see if the device is there,
 687                  * as block partitions don't point to the physical device.  Need to fix that
 688                  * up in the kernel...
 689                  */
 690                 if (strcmp(class_dev->classname, SYSFS_BLOCK_NAME) == 0) {
 691                         dbg("looking at block device");
 692                         if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
 693                                 dbg("really is a partition");
 694                                 class_dev_parent = sysfs_get_classdev_parent(class_dev);
 695                                 if (class_dev_parent == NULL) {
 696                                         dbg("sysfs_get_classdev_parent for class device '%s' failed", class_dev->name);
 697                                 } else {
 698                                         dbg("class_dev_parent->name='%s'", class_dev_parent->name);
 699                                         sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 700                                         if (sysfs_device != NULL)
 701                                                 goto exit;
 702                                 }
 703                         }
 704                 }
 705                 /* sleep to give the kernel a chance to create the link */
 706                 sleep(1);
 707
 708         }
 709         dbg("Timed out waiting for device symlink, continuing on anyway...");
 710 exit:
 711         return sysfs_device;
 712 }
 713
 714 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 715 {
 716         struct sysfs_device *sysfs_device = NULL;
 717         struct sysfs_class_device *class_dev_parent = NULL;
 718         int retval = 0;
 719         struct perm_device *perm;
 720         char *pos;
 721
 722         udev->mode = 0;
 723
 724         /* find the sysfs_device associated with this class device */
 725         sysfs_device = get_sysfs_device(class_dev);
 726         if (sysfs_device) {
 727                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 728                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 729                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 730                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 731                 wait_for_device_to_initialize(sysfs_device);
 732         } else {
 733                 dbg("class_dev->name = '%s'", class_dev->name);
 734         }
 735
 736         strfieldcpy(udev->kernel_name, class_dev->name);
 737
 738         /* get kernel number */
 739         pos = class_dev->name + strlen(class_dev->name);
 740         while (isdigit(*(pos-1)))
 741                 pos--;
 742         strfieldcpy(udev->kernel_number, pos);
 743         dbg("kernel_number='%s'", udev->kernel_number);
 744
 745         /* rules are looked at in priority order */
 746         retval = do_callout(class_dev, udev, sysfs_device);
 747         if (retval == 0)
 748                 goto found;
 749
 750         retval = do_label(class_dev, udev, sysfs_device);
 751         if (retval == 0)
 752                 goto found;
 753
 754         retval = do_number(class_dev, udev, sysfs_device);
 755         if (retval == 0)
 756                 goto found;
 757
 758         retval = do_topology(class_dev, udev, sysfs_device);
 759         if (retval == 0)
 760                 goto found;
 761
 762         retval = do_replace(class_dev, udev, sysfs_device);
 763         if (retval == 0)
 764                 goto found;
 765
 766         do_kernelname(class_dev, udev);
 767         goto done;
 768
 769 found:
 770         /* substitute placeholder */
 771         apply_format(udev, udev->name);
 772         apply_format(udev, udev->symlink);
 773
 774 done:
 775         perm = find_perm(udev->name);
 776         if (perm) {
 777                 udev->mode = perm->mode;
 778                 strfieldcpy(udev->owner, perm->owner);
 779                 strfieldcpy(udev->group, perm->group);
 780         } else {
 781                 /* no matching perms found :( */
 782                 udev->mode = get_default_mode(class_dev);
 783                 udev->owner[0] = 0x00;
 784                 udev->group[0] = 0x00;
 785         }
 786         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 787             udev->name, udev->owner, udev->group, udev->mode);
 788
 789         return 0;
 790 }
 791
 792 int namedev_init(void)
 793 {
 794         int retval;
 795
 796         retval = namedev_init_rules();
 797         if (retval)
 798                 return retval;
 799
 800         retval = namedev_init_permissions();
 801         if (retval)
 802                 return retval;
 803
 804         dump_config_dev_list();
 805         dump_perm_dev_list();
 806         return retval;
 807 }