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 build_kernel_number(struct sysfs_class_device *class_dev, struct udevice *udev)
 190 {
 191         char *dig;
 192
 193         dig = class_dev->name + strlen(class_dev->name);
 194         while (isdigit(*(dig-1)))
 195                 dig--;
 196         strfieldcpy(udev->kernel_number, dig);
 197         dbg("kernel_number='%s'", udev->kernel_number);
 198 }
 199
 200 static void apply_format(struct udevice *udev, unsigned char *string)
 201 {
 202         char name[NAME_SIZE];
 203         char temp[NAME_SIZE];
 204         char *tail;
 205         char *pos;
 206         char *pos2;
 207         char *pos3;
 208         int num;
 209
 210         while (1) {
 211                 num = 0;
 212                 pos = strchr(string, '%');
 213
 214                 if (pos) {
 215                         *pos = '\0';
 216                         tail = pos+1;
 217                         if (isdigit(tail[0])) {
 218                                 num = (int) strtoul(&pos[1], &tail, 10);
 219                                 if (tail == NULL) {
 220                                         dbg("format parsing error '%s'", pos+1);
 221                                         break;
 222                                 }
 223                         }
 224                         strfieldcpy(name, tail+1);
 225
 226                         switch (tail[0]) {
 227                         case 'b':
 228                                 if (strlen(udev->bus_id) == 0)
 229                                         break;
 230                                 strcat(pos, udev->bus_id);
 231                                 dbg("substitute bus_id '%s'", udev->bus_id);
 232                                 break;
 233                         case 'n':
 234                                 if (strlen(udev->kernel_number) == 0)
 235                                         break;
 236                                 strcat(pos, udev->kernel_number);
 237                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 238                                 break;
 239                         case 'D':
 240                                 if (strlen(udev->kernel_number) == 0) {
 241                                         strcat(pos, "disc");
 242                                         break;
 243                                 }
 244                                 strcat(pos, "part");
 245                                 strcat(pos, udev->kernel_number);
 246                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 247                                 break;
 248                         case 'm':
 249                                 sprintf(pos, "%u", udev->minor);
 250                                 dbg("substitute minor number '%u'", udev->minor);
 251                                 break;
 252                         case 'M':
 253                                 sprintf(pos, "%u", udev->major);
 254                                 dbg("substitute major number '%u'", udev->major);
 255                                 break;
 256                         case 'c':
 257                                 if (strlen(udev->callout_value) == 0)
 258                                         break;
 259                                 if (num) {
 260                                         /* get part of return string */
 261                                         strncpy(temp, udev->callout_value, sizeof(temp));
 262                                         pos2 = temp;
 263                                         while (num) {
 264                                                 num--;
 265                                                 pos3 = strsep(&pos2, " ");
 266                                                 if (pos3 == NULL) {
 267                                                         dbg("requested part of callout string not found");
 268                                                         break;
 269                                                 }
 270                                         }
 271                                         strcat(pos, pos3);
 272                                         dbg("substitute partial callout output '%s'", pos3);
 273                                 } else {
 274                                         strcat(pos, udev->callout_value);
 275                                         dbg("substitute callout output '%s'", udev->callout_value);
 276                                 }
 277                                 break;
 278                         default:
 279                                 dbg("unknown substitution type '%%%c'", pos[1]);
 280                                 break;
 281                         }
 282                         strcat(string, name);
 283                 } else
 284                         break;
 285         }
 286 }
 287
 288 static struct bus_file {
 289         char *bus;
 290         char *file;
 291 } bus_files[] = {
 292         { .bus = "scsi",        .file = "vendor" },
 293         { .bus = "usb",         .file = "idVendor" },
 294         {}
 295 };
 296
 297 #define SECONDS_TO_WAIT_FOR_FILE        10
 298 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
 299 {
 300         /* sleep until we see the file for this specific bus type show up this
 301          * is needed because we can easily out-run the kernel in looking for
 302          * these files before the paticular subsystem has created them in the
 303          * sysfs tree properly.
 304          *
 305          * And people thought that the /sbin/hotplug event system was going to
 306          * be slow, poo on you for arguing that before even testing it...
 307          */
 308         struct bus_file *b = &bus_files[0];
 309         struct sysfs_attribute *tmpattr;
 310         int loop;
 311
 312         while (1) {
 313                 if (b->bus == NULL)
 314                         break;
 315                 if (strcmp(sysfs_device->bus, b->bus) == 0) {
 316                         tmpattr = NULL;
 317                         loop = SECONDS_TO_WAIT_FOR_FILE;
 318                         while (loop--) {
 319                                 dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
 320                                 tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
 321                                 if (tmpattr) {
 322                                         /* found it! */
 323                                         goto exit;
 324                                 }
 325                                 /* sleep to give the kernel a chance to create the file */
 326                                 sleep(1);
 327                         }
 328                         dbg("Timed out waiting for '%s' file, continuing on anyway...", b->file);
 329                         goto exit;
 330                 }
 331                 b++;
 332         }
 333         dbg("Did not find bus type '%s' on list of bus_id_files, contact greg@kroah.com", sysfs_device->bus);
 334 exit:
 335         return; /* here to prevent compiler warning... */
 336 }
 337
 338 static int exec_callout(struct config_device *dev, char *value, int len)
 339 {
 340         int retval;
 341         int res;
 342         int status;
 343         int fds[2];
 344         pid_t pid;
 345         int value_set = 0;
 346         char buffer[256];
 347         char *pos;
 348         char *args[CALLOUT_MAXARG];
 349         int i;
 350
 351         dbg("callout to '%s'", dev->exec_program);
 352         retval = pipe(fds);
 353         if (retval != 0) {
 354                 dbg("pipe failed");
 355                 return -1;
 356         }
 357         pid = fork();
 358         if (pid == -1) {
 359                 dbg("fork failed");
 360                 return -1;
 361         }
 362
 363         if (pid == 0) {
 364                 /* child */
 365                 close(STDOUT_FILENO);
 366                 dup(fds[1]);    /* dup write side of pipe to STDOUT */
 367                 if (strchr(dev->exec_program, ' ')) {
 368                         /* callout with arguments */
 369                         pos = dev->exec_program;
 370                         for (i=0; i < CALLOUT_MAXARG-1; i++) {
 371                                 args[i] = strsep(&pos, " ");
 372                                 if (args[i] == NULL)
 373                                         break;
 374                         }
 375                         if (args[i]) {
 376                                 dbg("too many args - %d", i);
 377                                 args[i] = NULL;
 378                         }
 379                         retval = execve(args[0], args, main_envp);
 380                 } else {
 381                         retval = execve(dev->exec_program, main_argv, main_envp);
 382                 }
 383                 if (retval != 0) {
 384                         dbg("child execve failed");
 385                         exit(1);
 386                 }
 387                 return -1; /* avoid compiler warning */
 388         } else {
 389                 /* parent reads from fds[0] */
 390                 close(fds[1]);
 391                 retval = 0;
 392                 while (1) {
 393                         res = read(fds[0], buffer, sizeof(buffer) - 1);
 394                         if (res <= 0)
 395                                 break;
 396                         buffer[res] = '\0';
 397                         if (res > len) {
 398                                 dbg("callout len %d too short", len);
 399                                 retval = -1;
 400                         }
 401                         if (value_set) {
 402                                 dbg("callout value already set");
 403                                 retval = -1;
 404                         } else {
 405                                 value_set = 1;
 406                                 strncpy(value, buffer, len);
 407                                 pos = value + strlen(value)-1;
 408                                 if (pos[0] == '\n')
 409                                 pos[0] = '\0';
 410                                 dbg("callout returned '%s'", value);
 411                         }
 412                 }
 413                 close(fds[0]);
 414                 res = wait(&status);
 415                 if (res < 0) {
 416                         dbg("wait failed result %d", res);
 417                         retval = -1;
 418                 }
 419
 420 #ifndef __KLIBC__
 421                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 422                         dbg("callout program status 0x%x", status);
 423                         retval = -1;
 424                 }
 425 #endif
 426         }
 427         return retval;
 428 }
 429
 430 static int do_callout(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 431 {
 432         struct config_device *dev;
 433         struct list_head *tmp;
 434
 435         list_for_each(tmp, &config_device_list) {
 436                 dev = list_entry(tmp, struct config_device, node);
 437                 if (dev->type != CALLOUT)
 438                         continue;
 439
 440                 if (sysfs_device) {
 441                         dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 442                         if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 443                                 continue;
 444                 }
 445
 446                 /* substitute anything that needs to be in the program name */
 447                 apply_format(udev, dev->exec_program);
 448                 if (exec_callout(dev, udev->callout_value, NAME_SIZE))
 449                         continue;
 450                 if (strcmp_pattern(dev->id, udev->callout_value) != 0)
 451                         continue;
 452                 strfieldcpy(udev->name, dev->name);
 453                 strfieldcpy(udev->symlink, dev->symlink);
 454                 dbg("callout returned matching value '%s', '%s' becomes '%s'",
 455                     dev->id, class_dev->name, udev->name);
 456                 return 0;
 457         }
 458         return -ENODEV;
 459 }
 460
 461 static int do_label(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 462 {
 463         struct sysfs_attribute *tmpattr = NULL;
 464         struct config_device *dev;
 465         struct list_head *tmp;
 466         char *c;
 467
 468         list_for_each(tmp, &config_device_list) {
 469                 dev = list_entry(tmp, struct config_device, node);
 470                 if (dev->type != LABEL)
 471                         continue;
 472
 473                 if (sysfs_device) {
 474                         dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 475                         if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 476                                 continue;
 477                 }
 478
 479                 dbg("look for device attribute '%s'", dev->sysfs_file);
 480                 /* try to find the attribute in the class device directory */
 481                 tmpattr = sysfs_get_classdev_attr(class_dev, dev->sysfs_file);
 482                 if (tmpattr)
 483                         goto label_found;
 484
 485                 /* look in the class device directory if present */
 486                 if (sysfs_device) {
 487                         tmpattr = sysfs_get_device_attr(sysfs_device, dev->sysfs_file);
 488                         if (tmpattr)
 489                                 goto label_found;
 490                 }
 491
 492                 continue;
 493
 494 label_found:
 495                 c = tmpattr->value + strlen(tmpattr->value)-1;
 496                 if (*c == '\n')
 497                         *c = 0x00;
 498                 dbg("compare attribute '%s' value '%s' with '%s'",
 499                           dev->sysfs_file, tmpattr->value, dev->sysfs_value);
 500                 if (strcmp_pattern(dev->sysfs_value, tmpattr->value) != 0)
 501                         continue;
 502
 503                 strfieldcpy(udev->name, dev->name);
 504                 strfieldcpy(udev->symlink, dev->symlink);
 505                 dbg("found matching attribute '%s', '%s' becomes '%s' ",
 506                     dev->sysfs_file, 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
 639         /* FIXME!!! */
 640         /* This is needed here as we can easily out-race the placement of the
 641          * device symlink by the kernel.  The call to sleep(1); will be removed
 642          * once libsysfs can be queried for sysfs_get_classdev_device()
 643          * multiple times and have it return the proper information when the
 644          * class device really shows up.  For now, we live with the time
 645          * delay...
 646          */
 647         sleep(1);
 648
 649 #if 0   /* FIXME
 650            Something like this could also work, but for some reason doesn't,
 651            I also tried just stat() on the device symlink, but that still
 652            has nasty races, I'm probably doing something stupid... :( */
 653         loop = 10;
 654         while (loop--) {
 655                 struct stat buf;
 656                 int retval;
 657                 char filename[SYSFS_PATH_MAX + 6];
 658
 659                 strcpy(filename, class_dev->path);
 660                 strcat(filename, "/device");
 661                 dbg("looking for '%s'", filename);
 662                 retval = stat(filename, &buf);
 663                 if (!retval)
 664                         break;
 665
 666                 /* bah, let's go backwards up a level to see if the device is there,
 667                  * as block partitions don't point to the physical device.  Need to fix that
 668                  * up in the kernel...
 669                  */
 670                 if (strcmp(class_dev->classname, SYSFS_BLOCK_NAME) == 0) {
 671                         if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
 672                                 class_dev_parent = sysfs_get_classdev_parent(class_dev);
 673                                 if (class_dev_parent == NULL) {
 674                                         dbg("sysfs_get_classdev_parent for class device '%s' failed", class_dev->name);
 675                                 } else {
 676                                         strcpy(filename, class_dev_parent->path);
 677                                         strcat(filename, "/device");
 678                                         dbg("looking for '%s'", filename);
 679                                         retval = stat(filename, &buf);
 680                                         if (!retval)
 681                                                 break;
 682                                 }
 683                         }
 684                 }
 685                 /* sleep to give the kernel a chance to create the device file */
 686                 sleep(1);
 687         }
 688 #endif
 689         loop = 1;       /* FIXME put a real value in here for when everything is fixed... */
 690         while (loop--) {
 691                 /* find the sysfs_device for this class device */
 692                 /* Wouldn't it really be nice if libsysfs could do this for us? */
 693                 sysfs_device = sysfs_get_classdev_device(class_dev);
 694                 if (sysfs_device != NULL)
 695                         goto exit;
 696
 697                 /* bah, let's go backwards up a level to see if the device is there,
 698                  * as block partitions don't point to the physical device.  Need to fix that
 699                  * up in the kernel...
 700                  */
 701                 if (strcmp(class_dev->classname, SYSFS_BLOCK_NAME) == 0) {
 702                         dbg("looking at block device");
 703                         if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
 704                                 dbg("really is a partition");
 705                                 class_dev_parent = sysfs_get_classdev_parent(class_dev);
 706                                 if (class_dev_parent == NULL) {
 707                                         dbg("sysfs_get_classdev_parent for class device '%s' failed", class_dev->name);
 708                                 } else {
 709                                         dbg("class_dev_parent->name='%s'", class_dev_parent->name);
 710                                         sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 711                                         if (sysfs_device != NULL)
 712                                                 goto exit;
 713                                 }
 714                         }
 715                 }
 716                 /* sleep to give the kernel a chance to create the link */
 717                 sleep(1);
 718
 719         }
 720         dbg("Timed out waiting for device symlink, continuing on anyway...");
 721 exit:
 722         return sysfs_device;
 723 }
 724
 725 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 726 {
 727         struct sysfs_device *sysfs_device = NULL;
 728         struct sysfs_class_device *class_dev_parent = NULL;
 729         int retval = 0;
 730         struct perm_device *perm;
 731
 732         udev->mode = 0;
 733
 734         /* find the sysfs_device associated with this class device */
 735         sysfs_device = get_sysfs_device(class_dev);
 736         if (sysfs_device) {
 737                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 738                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 739                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 740                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 741                 wait_for_device_to_initialize(sysfs_device);
 742         } else {
 743                 dbg("class_dev->name = '%s'", class_dev->name);
 744         }
 745
 746         build_kernel_number(class_dev, udev);
 747
 748         /* rules are looked at in priority order */
 749         retval = do_callout(class_dev, udev, sysfs_device);
 750         if (retval == 0)
 751                 goto found;
 752
 753         retval = do_label(class_dev, udev, sysfs_device);
 754         if (retval == 0)
 755                 goto found;
 756
 757         retval = do_number(class_dev, udev, sysfs_device);
 758         if (retval == 0)
 759                 goto found;
 760
 761         retval = do_topology(class_dev, udev, sysfs_device);
 762         if (retval == 0)
 763                 goto found;
 764
 765         retval = do_replace(class_dev, udev, sysfs_device);
 766         if (retval == 0)
 767                 goto found;
 768
 769         do_kernelname(class_dev, udev);
 770         goto done;
 771
 772 found:
 773         /* substitute placeholder */
 774         apply_format(udev, udev->name);
 775         apply_format(udev, udev->symlink);
 776
 777 done:
 778         perm = find_perm(udev->name);
 779         if (perm) {
 780                 udev->mode = perm->mode;
 781                 strfieldcpy(udev->owner, perm->owner);
 782                 strfieldcpy(udev->group, perm->group);
 783         } else {
 784                 /* no matching perms found :( */
 785                 udev->mode = get_default_mode(class_dev);
 786                 udev->owner[0] = 0x00;
 787                 udev->group[0] = 0x00;
 788         }
 789         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 790             udev->name, udev->owner, udev->group, udev->mode);
 791
 792         return 0;
 793 }
 794
 795 int namedev_init(void)
 796 {
 797         int retval;
 798
 799         retval = namedev_init_rules();
 800         if (retval)
 801                 return retval;
 802
 803         retval = namedev_init_permissions();
 804         if (retval)
 805                 return retval;
 806
 807         dump_config_dev_list();
 808         dump_perm_dev_list();
 809         return retval;
 810 }