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                                         dbg("substitute devfs disc");
 204                                         break;
 205                                 }
 206                                 strcat(pos, "part");
 207                                 strcat(pos, udev->kernel_number);
 208                                 dbg("substitute devfs part '%s'", udev->kernel_number);
 209                                 break;
 210                         case 'm':
 211                                 sprintf(pos, "%u", udev->minor);
 212                                 dbg("substitute minor number '%u'", udev->minor);
 213                                 break;
 214                         case 'M':
 215                                 sprintf(pos, "%u", udev->major);
 216                                 dbg("substitute major number '%u'", udev->major);
 217                                 break;
 218                         case 'c':
 219                                 if (strlen(udev->callout_value) == 0)
 220                                         break;
 221                                 if (num) {
 222                                         /* get part of return string */
 223                                         strncpy(temp, udev->callout_value, sizeof(temp));
 224                                         pos2 = temp;
 225                                         while (num) {
 226                                                 num--;
 227                                                 pos3 = strsep(&pos2, " ");
 228                                                 if (pos3 == NULL) {
 229                                                         dbg("requested part of callout string not found");
 230                                                         break;
 231                                                 }
 232                                         }
 233                                         if (pos3) {
 234                                                 strcat(pos, pos3);
 235                                                 dbg("substitute partial callout output '%s'", pos3);
 236                                         }
 237                                 } else {
 238                                         strcat(pos, udev->callout_value);
 239                                         dbg("substitute callout output '%s'", udev->callout_value);
 240                                 }
 241                                 break;
 242                         default:
 243                                 dbg("unknown substitution type '%%%c'", pos[1]);
 244                                 break;
 245                         }
 246                         strcat(string, name);
 247                 } else
 248                         break;
 249         }
 250 }
 251
 252 static struct bus_file {
 253         char *bus;
 254         char *file;
 255 } bus_files[] = {
 256         { .bus = "scsi",        .file = "vendor" },
 257         { .bus = "usb",         .file = "idVendor" },
 258         { .bus = "ide",         .file = "detach_state" },
 259         { .bus = "pci",         .file = "vendor" },
 260         {}
 261 };
 262
 263 #define SECONDS_TO_WAIT_FOR_FILE        10
 264 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
 265 {
 266         /* sleep until we see the file for this specific bus type show up this
 267          * is needed because we can easily out-run the kernel in looking for
 268          * these files before the paticular subsystem has created them in the
 269          * sysfs tree properly.
 270          *
 271          * And people thought that the /sbin/hotplug event system was going to
 272          * be slow, poo on you for arguing that before even testing it...
 273          */
 274         struct bus_file *b = &bus_files[0];
 275         struct sysfs_attribute *tmpattr;
 276         int loop;
 277
 278         while (1) {
 279                 if (b->bus == NULL)
 280                         break;
 281                 if (strcmp(sysfs_device->bus, b->bus) == 0) {
 282                         tmpattr = NULL;
 283                         loop = SECONDS_TO_WAIT_FOR_FILE;
 284                         while (loop--) {
 285                                 dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
 286                                 tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
 287                                 if (tmpattr) {
 288                                         /* found it! */
 289                                         goto exit;
 290                                 }
 291                                 /* sleep to give the kernel a chance to create the file */
 292                                 sleep(1);
 293                         }
 294                         dbg("Timed out waiting for '%s' file, continuing on anyway...", b->file);
 295                         goto exit;
 296                 }
 297                 b++;
 298         }
 299         dbg("Did not find bus type '%s' on list of bus_id_files, contact greg@kroah.com", sysfs_device->bus);
 300 exit:
 301         return; /* here to prevent compiler warning... */
 302 }
 303
 304 static int exec_callout(struct config_device *dev, char *value, int len)
 305 {
 306         int retval;
 307         int res;
 308         int status;
 309         int fds[2];
 310         pid_t pid;
 311         int value_set = 0;
 312         char buffer[256];
 313         char *pos;
 314         char *args[CALLOUT_MAXARG];
 315         int i;
 316
 317         dbg("callout to '%s'", dev->exec_program);
 318         retval = pipe(fds);
 319         if (retval != 0) {
 320                 dbg("pipe failed");
 321                 return -1;
 322         }
 323         pid = fork();
 324         if (pid == -1) {
 325                 dbg("fork failed");
 326                 return -1;
 327         }
 328
 329         if (pid == 0) {
 330                 /* child */
 331                 close(STDOUT_FILENO);
 332                 dup(fds[1]);    /* dup write side of pipe to STDOUT */
 333                 if (strchr(dev->exec_program, ' ')) {
 334                         /* callout with arguments */
 335                         pos = dev->exec_program;
 336                         for (i=0; i < CALLOUT_MAXARG-1; i++) {
 337                                 args[i] = strsep(&pos, " ");
 338                                 if (args[i] == NULL)
 339                                         break;
 340                         }
 341                         if (args[i]) {
 342                                 dbg("too many args - %d", i);
 343                                 args[i] = NULL;
 344                         }
 345                         retval = execve(args[0], args, main_envp);
 346                 } else {
 347                         retval = execve(dev->exec_program, main_argv, main_envp);
 348                 }
 349                 if (retval != 0) {
 350                         dbg("child execve failed");
 351                         exit(1);
 352                 }
 353                 return -1; /* avoid compiler warning */
 354         } else {
 355                 /* parent reads from fds[0] */
 356                 close(fds[1]);
 357                 retval = 0;
 358                 while (1) {
 359                         res = read(fds[0], buffer, sizeof(buffer) - 1);
 360                         if (res <= 0)
 361                                 break;
 362                         buffer[res] = '\0';
 363                         if (res > len) {
 364                                 dbg("callout len %d too short", len);
 365                                 retval = -1;
 366                         }
 367                         if (value_set) {
 368                                 dbg("callout value already set");
 369                                 retval = -1;
 370                         } else {
 371                                 value_set = 1;
 372                                 strncpy(value, buffer, len);
 373                                 pos = value + strlen(value)-1;
 374                                 if (pos[0] == '\n')
 375                                 pos[0] = '\0';
 376                                 dbg("callout returned '%s'", value);
 377                         }
 378                 }
 379                 close(fds[0]);
 380                 res = wait(&status);
 381                 if (res < 0) {
 382                         dbg("wait failed result %d", res);
 383                         retval = -1;
 384                 }
 385
 386 #ifndef __KLIBC__
 387                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 388                         dbg("callout program status 0x%x", status);
 389                         retval = -1;
 390                 }
 391 #endif
 392         }
 393         return retval;
 394 }
 395
 396 static int do_callout(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 397 {
 398         struct config_device *dev;
 399         struct list_head *tmp;
 400
 401         list_for_each(tmp, &config_device_list) {
 402                 dev = list_entry(tmp, struct config_device, node);
 403                 if (dev->type != CALLOUT)
 404                         continue;
 405
 406                 if (dev->bus[0] != '\0') {
 407                         /* as the user specified a bus, we must match it up */
 408                         if (!sysfs_device)
 409                                 continue;
 410                         dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 411                         if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 412                                 continue;
 413                 }
 414
 415                 /* substitute anything that needs to be in the program name */
 416                 apply_format(udev, dev->exec_program);
 417                 if (exec_callout(dev, udev->callout_value, NAME_SIZE))
 418                         continue;
 419                 if (strcmp_pattern(dev->id, udev->callout_value) != 0)
 420                         continue;
 421                 strfieldcpy(udev->name, dev->name);
 422                 strfieldcpy(udev->symlink, dev->symlink);
 423                 dbg("callout returned matching value '%s', '%s' becomes '%s'",
 424                     dev->id, class_dev->name, udev->name);
 425                 return 0;
 426         }
 427         return -ENODEV;
 428 }
 429
 430 static int match_pair(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
 431 {
 432         struct sysfs_attribute *tmpattr = NULL;
 433         char *c;
 434
 435         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
 436                 return -ENODEV;
 437
 438         dbg("look for device attribute '%s'", pair->file);
 439         /* try to find the attribute in the class device directory */
 440         tmpattr = sysfs_get_classdev_attr(class_dev, pair->file);
 441         if (tmpattr)
 442                 goto label_found;
 443
 444         /* look in the class device directory if present */
 445         if (sysfs_device) {
 446                 tmpattr = sysfs_get_device_attr(sysfs_device, pair->file);
 447                 if (tmpattr)
 448                         goto label_found;
 449         }
 450
 451         return -ENODEV;
 452
 453 label_found:
 454         c = tmpattr->value + strlen(tmpattr->value)-1;
 455         if (*c == '\n')
 456                 *c = 0x00;
 457         dbg("compare attribute '%s' value '%s' with '%s'",
 458                   pair->file, tmpattr->value, pair->value);
 459         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 460                 return -ENODEV;
 461
 462         dbg("found matching attribute '%s' with value '%s'",
 463             pair->file, pair->value);
 464         return 0;
 465 }
 466
 467 static int do_label(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 468 {
 469         struct sysfs_pair *pair;
 470         struct config_device *dev;
 471         struct list_head *tmp;
 472         int i;
 473         int match;
 474
 475         list_for_each(tmp, &config_device_list) {
 476                 dev = list_entry(tmp, struct config_device, node);
 477                 if (dev->type != LABEL)
 478                         continue;
 479
 480                 if (dev->bus[0] != '\0') {
 481                         /* as the user specified a bus, we must match it up */
 482                         if (!sysfs_device)
 483                                 continue;
 484                         dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 485                         if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 486                                 continue;
 487                 }
 488
 489                 match = 1;
 490                 for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
 491                         pair = &dev->sysfs_pair[i];
 492                         if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
 493                                 break;
 494                         if (match_pair(class_dev, sysfs_device, pair) != 0) {
 495                                 match = 0;
 496                                 break;
 497                         }
 498                 }
 499                 if (match == 0)
 500                         continue;
 501
 502                 /* found match */
 503                 strfieldcpy(udev->name, dev->name);
 504                 strfieldcpy(udev->symlink, dev->symlink);
 505                 dbg("found matching attribute, '%s' becomes '%s' ",
 506                     class_dev->name, udev->name);
 507
 508                 return 0;
 509         }
 510         return -ENODEV;
 511 }
 512
 513 static int do_number(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 514 {
 515         struct config_device *dev;
 516         struct list_head *tmp;
 517         char path[SYSFS_PATH_MAX];
 518         int found;
 519         char *temp = NULL;
 520
 521         /* we have to have a sysfs device for NUMBER to work */
 522         if (!sysfs_device)
 523                 return -ENODEV;
 524
 525         list_for_each(tmp, &config_device_list) {
 526                 dev = list_entry(tmp, struct config_device, node);
 527                 if (dev->type != NUMBER)
 528                         continue;
 529
 530                 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 531                 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 532                         continue;
 533
 534                 found = 0;
 535                 strfieldcpy(path, sysfs_device->path);
 536                 temp = strrchr(path, '/');
 537                 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 538                 if (strstr(temp, dev->id) != NULL) {
 539                         found = 1;
 540                 } else {
 541                         *temp = 0x00;
 542                         temp = strrchr(path, '/');
 543                         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 544                         if (strstr(temp, dev->id) != NULL)
 545                                 found = 1;
 546                 }
 547                 if (!found)
 548                         continue;
 549                 strfieldcpy(udev->name, dev->name);
 550                 strfieldcpy(udev->symlink, dev->symlink);
 551                 dbg("found matching id '%s', '%s' becomes '%s'",
 552                     dev->id, class_dev->name, udev->name);
 553                 return 0;
 554         }
 555         return -ENODEV;
 556 }
 557
 558 static int do_topology(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 559 {
 560         struct config_device *dev;
 561         struct list_head *tmp;
 562         char path[SYSFS_PATH_MAX];
 563         int found;
 564         char *temp = NULL;
 565
 566         /* we have to have a sysfs device for TOPOLOGY to work */
 567         if (!sysfs_device)
 568                 return -ENODEV;
 569
 570         list_for_each(tmp, &config_device_list) {
 571                 dev = list_entry(tmp, struct config_device, node);
 572                 if (dev->type != TOPOLOGY)
 573                         continue;
 574
 575                 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 576                 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 577                         continue;
 578
 579                 found = 0;
 580                 strfieldcpy(path, sysfs_device->path);
 581                 temp = strrchr(path, '/');
 582                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 583                 if (strstr(temp, dev->place) != NULL) {
 584                         found = 1;
 585                 } else {
 586                         *temp = 0x00;
 587                         temp = strrchr(path, '/');
 588                         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 589                         if (strstr(temp, dev->place) != NULL)
 590                                 found = 1;
 591                 }
 592                 if (!found)
 593                         continue;
 594
 595                 strfieldcpy(udev->name, dev->name);
 596                 strfieldcpy(udev->symlink, dev->symlink);
 597                 dbg("found matching place '%s', '%s' becomes '%s'",
 598                     dev->place, class_dev->name, udev->name);
 599                 return 0;
 600         }
 601         return -ENODEV;
 602 }
 603
 604 static int do_replace(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 605 {
 606         struct config_device *dev;
 607         struct list_head *tmp;
 608
 609         list_for_each(tmp, &config_device_list) {
 610                 dev = list_entry(tmp, struct config_device, node);
 611                 if (dev->type != REPLACE)
 612                         continue;
 613
 614                 dbg("compare name '%s' with '%s'", dev->kernel_name, class_dev->name);
 615                 if (strcmp_pattern(dev->kernel_name, class_dev->name) != 0)
 616                         continue;
 617
 618                 strfieldcpy(udev->name, dev->name);
 619                 strfieldcpy(udev->symlink, dev->symlink);
 620                 dbg("found name, '%s' becomes '%s'", dev->kernel_name, udev->name);
 621
 622                 return 0;
 623         }
 624         return -ENODEV;
 625 }
 626
 627 static void do_kernelname(struct sysfs_class_device *class_dev, struct udevice *udev)
 628 {
 629         /* heh, this is pretty simple... */
 630         strfieldcpy(udev->name, class_dev->name);
 631 }
 632
 633 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
 634 {
 635         struct sysfs_device *sysfs_device;
 636         struct sysfs_class_device *class_dev_parent;
 637         int loop;
 638         char filename[SYSFS_PATH_MAX + 6];
 639         int retval;
 640         char *temp;
 641         int partition = 0;
 642
 643         /* Figure out where the device symlink is at.  For char devices this will
 644          * always be in the class_dev->path.  But for block devices, it's different.
 645          * The main block device will have the device symlink in it's path, but
 646          * all partitions have the symlink in its parent directory.
 647          * But we need to watch out for block devices that do not have parents, yet
 648          * look like a partition (fd0, loop0, etc.)  They all do not have a device
 649          * symlink yet.  We do sit and spin on waiting for them right now, we should
 650          * possibly have a whitelist for these devices here...
 651          */
 652         strcpy(filename, class_dev->path);
 653         dbg("filename = %s", filename);
 654         if (strcmp(class_dev->classname, SYSFS_BLOCK_NAME) == 0) {
 655                 if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
 656                         temp = strrchr(filename, '/');
 657                         if (temp) {
 658                                 char *temp2 = strrchr(filename, '/');
 659                                 partition = 1;
 660                                 *temp = 0x00;
 661                                 dbg("temp2 = %s", temp2);
 662                                 if (temp2 && (strcmp(temp2, "/block") == 0)) {
 663                                         /* oops, we have no parent block device, so go back to original directory */
 664                                         strcpy(filename, class_dev->path);
 665                                         partition = 0;
 666                                 }
 667                         }
 668                 }
 669         }
 670         strcat(filename, "/device");
 671
 672         loop = 2;
 673         while (loop--) {
 674                 struct stat buf;
 675                 dbg("looking for '%s'", filename);
 676                 retval = stat(filename, &buf);
 677                 if (!retval)
 678                         break;
 679                 /* sleep to give the kernel a chance to create the device file */
 680                 sleep(1);
 681         }
 682
 683         loop = 1;       /* FIXME put a real value in here for when everything is fixed... */
 684         while (loop--) {
 685                 /* find the sysfs_device for this class device */
 686                 /* Wouldn't it really be nice if libsysfs could do this for us? */
 687                 sysfs_device = sysfs_get_classdev_device(class_dev);
 688                 if (sysfs_device != NULL)
 689                         goto exit;
 690
 691                 /* if it's a partition, we need to get the parent device */
 692                 if (partition) {
 693                         /* FIXME  HACK HACK HACK HACK
 694                          * for some reason partitions need this extra sleep here, in order
 695                          * to wait for the device properly.  Once the libsysfs code is
 696                          * fixed properly, this sleep should go away, and we can just loop above.
 697                          */
 698                         sleep(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                 /* sleep to give the kernel a chance to create the link */
 711                 /* FIXME remove comment...
 712                 sleep(1); */
 713         }
 714         dbg("Timed out waiting for device symlink, continuing on anyway...");
 715 exit:
 716         return sysfs_device;
 717 }
 718
 719 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 720 {
 721         struct sysfs_device *sysfs_device = NULL;
 722         int retval = 0;
 723         struct perm_device *perm;
 724         char *pos;
 725
 726         udev->mode = 0;
 727
 728         /* find the sysfs_device associated with this class device */
 729         sysfs_device = get_sysfs_device(class_dev);
 730         if (sysfs_device) {
 731                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 732                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 733                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 734                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 735                 wait_for_device_to_initialize(sysfs_device);
 736         } else {
 737                 dbg("class_dev->name = '%s'", class_dev->name);
 738         }
 739
 740         strfieldcpy(udev->kernel_name, class_dev->name);
 741
 742         /* get kernel number */
 743         pos = class_dev->name + strlen(class_dev->name);
 744         while (isdigit(*(pos-1)))
 745                 pos--;
 746         strfieldcpy(udev->kernel_number, pos);
 747         dbg("kernel_number='%s'", udev->kernel_number);
 748
 749         /* rules are looked at in priority order */
 750         retval = do_callout(class_dev, udev, sysfs_device);
 751         if (retval == 0)
 752                 goto found;
 753
 754         retval = do_label(class_dev, udev, sysfs_device);
 755         if (retval == 0)
 756                 goto found;
 757
 758         retval = do_number(class_dev, udev, sysfs_device);
 759         if (retval == 0)
 760                 goto found;
 761
 762         retval = do_topology(class_dev, udev, sysfs_device);
 763         if (retval == 0)
 764                 goto found;
 765
 766         retval = do_replace(class_dev, udev, sysfs_device);
 767         if (retval == 0)
 768                 goto found;
 769
 770         do_kernelname(class_dev, udev);
 771         goto done;
 772
 773 found:
 774         /* substitute placeholder */
 775         apply_format(udev, udev->name);
 776         apply_format(udev, udev->symlink);
 777
 778 done:
 779         perm = find_perm(udev->name);
 780         if (perm) {
 781                 udev->mode = perm->mode;
 782                 strfieldcpy(udev->owner, perm->owner);
 783                 strfieldcpy(udev->group, perm->group);
 784         } else {
 785                 /* no matching perms found :( */
 786                 udev->mode = get_default_mode(class_dev);
 787                 udev->owner[0] = 0x00;
 788                 udev->group[0] = 0x00;
 789         }
 790         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 791             udev->name, udev->owner, udev->group, udev->mode);
 792
 793         return 0;
 794 }
 795
 796 int namedev_init(void)
 797 {
 798         int retval;
 799
 800         retval = namedev_init_rules();
 801         if (retval)
 802                 return retval;
 803
 804         retval = namedev_init_permissions();
 805         if (retval)
 806                 return retval;
 807
 808         dump_config_dev_list();
 809         dump_perm_dev_list();
 810         return retval;
 811 }