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 <time.h>
  33 #include <sys/wait.h>
  34 #include <sys/stat.h>
  35
  36 #include "list.h"
  37 #include "udev.h"
  38 #include "udev_version.h"
  39 #include "logging.h"
  40 #include "namedev.h"
  41 #include "libsysfs/libsysfs.h"
  42 #include "klibc_fixups.h"
  43
  44 LIST_HEAD(config_device_list);
  45 LIST_HEAD(perm_device_list);
  46
  47 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  48 static int strcmp_pattern(const char *p, const char *s)
  49 {
  50         if (s[0] == '\0') {
  51                 while (p[0] == '*')
  52                         p++;
  53                 return (p[0] != '\0');
  54         }
  55         switch (p[0]) {
  56         case '[':
  57                 {
  58                         int not = 0;
  59                         p++;
  60                         if (p[0] == '!') {
  61                                 not = 1;
  62                                 p++;
  63                         }
  64                         while ((p[0] != '\0') && (p[0] != ']')) {
  65                                 int match = 0;
  66                                 if (p[1] == '-') {
  67                                         if ((s[0] >= p[0]) && (s[0] <= p[2]))
  68                                                 match = 1;
  69                                         p += 3;
  70                                 } else {
  71                                         match = (p[0] == s[0]);
  72                                         p++;
  73                                 }
  74                                 if (match ^ not) {
  75                                         while ((p[0] != '\0') && (p[0] != ']'))
  76                                                 p++;
  77                                         if (p[0] == ']')
  78                                                 return strcmp_pattern(p+1, s+1);
  79                                 }
  80                         }
  81                 }
  82                 break;
  83         case '*':
  84                 if (strcmp_pattern(p, s+1))
  85                         return strcmp_pattern(p+1, s);
  86                 return 0;
  87         case '\0':
  88                 if (s[0] == '\0') {
  89                         return 0;
  90                 }
  91                 break;
  92         default:
  93                 if ((p[0] == s[0]) || (p[0] == '?'))
  94                         return strcmp_pattern(p+1, s+1);
  95                 break;
  96         }
  97         return 1;
  98 }
  99
 100 #define copy_var(a, b, var)             \
 101         if (b->var)                     \
 102                 a->var = b->var;
 103
 104 #define copy_string(a, b, var)          \
 105         if (strlen(b->var))             \
 106                 strcpy(a->var, b->var);
 107
 108 int add_perm_dev(struct perm_device *new_dev)
 109 {
 110         struct perm_device *dev;
 111         struct perm_device *tmp_dev;
 112
 113         /* update the values if we already have the device */
 114         list_for_each_entry(dev, &perm_device_list, node) {
 115                 if (strcmp(new_dev->name, dev->name))
 116                         continue;
 117                 copy_var(dev, new_dev, mode);
 118                 copy_string(dev, new_dev, owner);
 119                 copy_string(dev, new_dev, group);
 120                 return 0;
 121         }
 122
 123         /* not found, add new structure to the perm list */
 124         tmp_dev = malloc(sizeof(*tmp_dev));
 125         if (!tmp_dev)
 126                 return -ENOMEM;
 127         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 128         list_add_tail(&tmp_dev->node, &perm_device_list);
 129         //dump_perm_dev(tmp_dev);
 130         return 0;
 131 }
 132
 133 static struct perm_device *find_perm(char *name)
 134 {
 135         struct perm_device *perm;
 136
 137         list_for_each_entry(perm, &perm_device_list, 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(void)
 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 char *get_default_owner(void)
 156 {
 157         if (strlen(default_owner_str) == 0)
 158                 strncpy(default_owner_str, "root", OWNER_SIZE);
 159
 160         return default_owner_str;
 161 }
 162
 163 static char *get_default_group(void)
 164 {
 165         if (strlen(default_group_str) == 0)
 166                 strncpy(default_group_str, "root", GROUP_SIZE);
 167
 168         return default_group_str;
 169 }
 170
 171 static void apply_format(struct udevice *udev, unsigned char *string)
 172 {
 173         char temp[NAME_SIZE];
 174         char temp1[NAME_SIZE];
 175         char *tail;
 176         char *pos;
 177         char *pos2;
 178         char *pos3;
 179         int num;
 180
 181         pos = string;
 182         while (1) {
 183                 num = 0;
 184                 pos = strchr(pos, '%');
 185
 186                 if (pos) {
 187                         pos[0] = '\0';
 188                         tail = pos+1;
 189                         if (isdigit(tail[0])) {
 190                                 num = (int) strtoul(&pos[1], &tail, 10);
 191                                 if (tail == NULL) {
 192                                         dbg("format parsing error '%s'", pos+1);
 193                                         break;
 194                                 }
 195                         }
 196                         strfieldcpy(temp, tail+1);
 197
 198                         switch (tail[0]) {
 199                         case 'b':
 200                                 if (strlen(udev->bus_id) == 0)
 201                                         break;
 202                                 strcat(pos, udev->bus_id);
 203                                 dbg("substitute bus_id '%s'", udev->bus_id);
 204                                 break;
 205                         case 'k':
 206                                 if (strlen(udev->kernel_name) == 0)
 207                                         break;
 208                                 strcat(pos, udev->kernel_name);
 209                                 dbg("substitute kernel name '%s'", udev->kernel_name);
 210                                 break;
 211                         case 'n':
 212                                 if (strlen(udev->kernel_number) == 0)
 213                                         break;
 214                                 strcat(pos, udev->kernel_number);
 215                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 216                                 break;
 217                         case 'm':
 218                                 sprintf(pos, "%u", udev->minor);
 219                                 dbg("substitute minor number '%u'", udev->minor);
 220                                 break;
 221                         case 'M':
 222                                 sprintf(pos, "%u", udev->major);
 223                                 dbg("substitute major number '%u'", udev->major);
 224                                 break;
 225                         case 'c':
 226                                 if (strlen(udev->program_result) == 0)
 227                                         break;
 228                                 if (num) {
 229                                         /* get part of return string */
 230                                         strncpy(temp1, udev->program_result, sizeof(temp1));
 231                                         pos2 = temp1;
 232                                         while (num) {
 233                                                 num--;
 234                                                 pos3 = strsep(&pos2, " ");
 235                                                 if (pos3 == NULL) {
 236                                                         dbg("requested part of result string not found");
 237                                                         break;
 238                                                 }
 239                                         }
 240                                         if (pos3) {
 241                                                 strcat(pos, pos3);
 242                                                 dbg("substitute part of result string '%s'", pos3);
 243                                         }
 244                                 } else {
 245                                         strcat(pos, udev->program_result);
 246                                         dbg("substitute result string '%s'", udev->program_result);
 247                                 }
 248                                 break;
 249                         case '%':
 250                                 strcat(pos, "%");
 251                                 pos++;
 252                                 break;
 253                         default:
 254                                 dbg("unknown substitution type '%%%c'", pos[1]);
 255                                 break;
 256                         }
 257                         strcat(string, temp);
 258                 } else
 259                         break;
 260         }
 261 }
 262
 263 /*
 264  * Note, we can have multiple files for different busses in here due
 265  * to the mess that USB has for its device tree...
 266  */
 267 static struct bus_file {
 268         char *bus;
 269         char *file;
 270 } bus_files[] = {
 271         { .bus = "scsi",        .file = "vendor" },
 272         { .bus = "usb",         .file = "idVendor" },
 273         { .bus = "usb",         .file = "iInterface" },
 274         { .bus = "usb-serial",  .file = "detach_state" },
 275         { .bus = "ide",         .file = "detach_state" },
 276         { .bus = "pci",         .file = "vendor" },
 277         {}
 278 };
 279
 280 #define SECONDS_TO_WAIT_FOR_FILE        10
 281 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
 282 {
 283         /* sleep until we see the file for this specific bus type show up this
 284          * is needed because we can easily out-run the kernel in looking for
 285          * these files before the paticular subsystem has created them in the
 286          * sysfs tree properly.
 287          *
 288          * And people thought that the /sbin/hotplug event system was going to
 289          * be slow, poo on you for arguing that before even testing it...
 290          */
 291         struct bus_file *b = &bus_files[0];
 292         struct sysfs_attribute *tmpattr;
 293         int found = 0;
 294         int loop = SECONDS_TO_WAIT_FOR_FILE;
 295
 296         while (1) {
 297                 if (b->bus == NULL) {
 298                         if (!found)
 299                                 break;
 300                         /* sleep to give the kernel a chance to create the file */
 301                         sleep(1);
 302                         --loop;
 303                         if (loop == 0)
 304                                 break;
 305                         b = &bus_files[0];
 306                 }
 307                 if (strcmp(sysfs_device->bus, b->bus) == 0) {
 308                         found = 1;
 309                         dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
 310                         tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
 311                         if (tmpattr) {
 312                                 /* found it! */
 313                                 goto exit;
 314                         }
 315                         dbg("can't find '%s' file", b->file);
 316                 }
 317                 ++b;
 318         }
 319         if (!found)
 320                 dbg("did not find bus type '%s' on list of bus_id_files, "
 321                     "contact greg@kroah.com", sysfs_device->bus);
 322 exit:
 323         return; /* here to prevent compiler warning... */
 324 }
 325
 326 static void fix_kernel_name(struct udevice *udev)
 327 {
 328         char *temp = udev->kernel_name;
 329
 330         while (*temp != 0x00) {
 331                 /* Some block devices have a ! in their name,
 332                  * we need to change that to / */
 333                 if (*temp == '!')
 334                         *temp = '/';
 335                 ++temp;
 336         }
 337 }
 338
 339 static int execute_program(char *path, char *value, int len)
 340 {
 341         int retval;
 342         int res;
 343         int status;
 344         int fds[2];
 345         pid_t pid;
 346         int value_set = 0;
 347         char buffer[256];
 348         char *pos;
 349         char *args[PROGRAM_MAXARG];
 350         int i;
 351
 352         dbg("executing '%s'", path);
 353         retval = pipe(fds);
 354         if (retval != 0) {
 355                 dbg("pipe failed");
 356                 return -1;
 357         }
 358         pid = fork();
 359         switch(pid) {
 360         case 0:
 361                 /* child */
 362                 close(STDOUT_FILENO);
 363                 dup(fds[1]);    /* dup write side of pipe to STDOUT */
 364                 if (strchr(path, ' ')) {
 365                         /* exec with arguments */
 366                         pos = path;
 367                         for (i=0; i < PROGRAM_MAXARG-1; i++) {
 368                                 args[i] = strsep(&pos, " ");
 369                                 if (args[i] == NULL)
 370                                         break;
 371                         }
 372                         if (args[i]) {
 373                                 dbg("too many args - %d", i);
 374                                 args[i] = NULL;
 375                         }
 376                         retval = execv(args[0], args);
 377                 } else {
 378                         retval = execv(path, main_argv);
 379                 }
 380                 dbg("child execve failed");
 381                 exit(1);
 382         case -1:
 383                 dbg("fork failed");
 384                 return -1;
 385         default:
 386                 /* parent reads from fds[0] */
 387                 close(fds[1]);
 388                 retval = 0;
 389                 while (1) {
 390                         res = read(fds[0], buffer, sizeof(buffer) - 1);
 391                         if (res <= 0)
 392                                 break;
 393                         buffer[res] = '\0';
 394                         if (res > len) {
 395                                 dbg("result len %d too short", len);
 396                                 retval = -1;
 397                         }
 398                         if (value_set) {
 399                                 dbg("result value already set");
 400                                 retval = -1;
 401                         } else {
 402                                 value_set = 1;
 403                                 strncpy(value, buffer, len);
 404                                 pos = value + strlen(value)-1;
 405                                 if (pos[0] == '\n')
 406                                 pos[0] = '\0';
 407                                 dbg("result is '%s'", value);
 408                         }
 409                 }
 410                 close(fds[0]);
 411                 res = wait(&status);
 412                 if (res < 0) {
 413                         dbg("wait failed result %d", res);
 414                         retval = -1;
 415                 }
 416
 417                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 418                         dbg("exec program status 0x%x", status);
 419                         retval = -1;
 420                 }
 421         }
 422         return retval;
 423 }
 424
 425 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
 426 {
 427         struct sysfs_attribute *tmpattr = NULL;
 428         char *c;
 429
 430         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
 431                 return -ENODEV;
 432
 433         dbg("look for device attribute '%s'", pair->file);
 434         /* try to find the attribute in the class device directory */
 435         tmpattr = sysfs_get_classdev_attr(class_dev, pair->file);
 436         if (tmpattr)
 437                 goto label_found;
 438
 439         /* look in the class device directory if present */
 440         if (sysfs_device) {
 441                 tmpattr = sysfs_get_device_attr(sysfs_device, pair->file);
 442                 if (tmpattr)
 443                         goto label_found;
 444         }
 445         return -ENODEV;
 446
 447 label_found:
 448         c = tmpattr->value + strlen(tmpattr->value)-1;
 449         if (*c == '\n')
 450                 *c = 0x00;
 451         dbg("compare attribute '%s' value '%s' with '%s'",
 452                   pair->file, tmpattr->value, pair->value);
 453         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 454                 return -ENODEV;
 455
 456         dbg("found matching attribute '%s' with value '%s'",
 457             pair->file, pair->value);
 458         return 0;
 459 }
 460
 461 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 462 {
 463         struct sysfs_pair *pair;
 464         int i;
 465
 466         for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
 467                 pair = &dev->sysfs_pair[i];
 468                 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
 469                         break;
 470                 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
 471                         dbg("sysfs attribute doesn't match");
 472                         return -ENODEV;
 473                 }
 474         }
 475
 476         return 0;
 477 }
 478
 479 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 480 {
 481         char path[SYSFS_PATH_MAX];
 482         char *temp = NULL;
 483
 484         /* we have to have a sysfs device for ID to work */
 485         if (!sysfs_device)
 486                 return -ENODEV;
 487
 488         strfieldcpy(path, sysfs_device->path);
 489         temp = strrchr(path, '/');
 490         temp++;
 491         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 492         if (strcmp_pattern(dev->id, temp) != 0)
 493                 return -ENODEV;
 494         else
 495                 return 0;
 496 }
 497
 498 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 499 {
 500         char path[SYSFS_PATH_MAX];
 501         int found;
 502         char *temp = NULL;
 503
 504         /* we have to have a sysfs device for PLACE to work */
 505         if (!sysfs_device)
 506                 return -ENODEV;
 507
 508         found = 0;
 509         strfieldcpy(path, sysfs_device->path);
 510         temp = strrchr(path, '/');
 511         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 512         if (strstr(temp, dev->place) != NULL) {
 513                 found = 1;
 514         } else {
 515                 *temp = 0x00;
 516                 temp = strrchr(path, '/');
 517                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 518                 if (strstr(temp, dev->place) != NULL)
 519                         found = 1;
 520         }
 521         if (!found) {
 522                 dbg("place doesn't match");
 523                 return -ENODEV;
 524         }
 525
 526         return 0;
 527 }
 528
 529 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
 530 {
 531         struct sysfs_device *sysfs_device;
 532         struct sysfs_class_device *class_dev_parent;
 533         struct timespec tspec;
 534         int loop;
 535
 536         /* Figure out where the device symlink is at.  For char devices this will
 537          * always be in the class_dev->path.  But for block devices, it's different.
 538          * The main block device will have the device symlink in it's path, but
 539          * all partitions have the symlink in its parent directory.
 540          * But we need to watch out for block devices that do not have parents, yet
 541          * look like a partition (fd0, loop0, etc.)  They all do not have a device
 542          * symlink yet.  We do sit and spin on waiting for them right now, we should
 543          * possibly have a whitelist for these devices here...
 544          */
 545         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 546         if (class_dev_parent)
 547                 dbg("Really a partition");
 548
 549         tspec.tv_sec = 0;
 550         tspec.tv_nsec = 10000000;  /* sleep 10 millisec */
 551         loop = 10;
 552         while (loop--) {
 553                 nanosleep(&tspec, NULL);
 554                 if (class_dev_parent)
 555                         sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 556                 else
 557                         sysfs_device = sysfs_get_classdev_device(class_dev);
 558
 559                 if (sysfs_device != NULL)
 560                         goto device_found;
 561         }
 562         dbg("timed out waiting for device symlink, continuing on anyway...");
 563
 564 device_found:
 565         /* We have another issue with just the wait above - the sysfs part of
 566          * the kernel may not be quick enough to have created the link to the
 567          * device under the "bus" subsystem. Due to this, the sysfs_device->bus
 568          * will not contain the actual bus name :(
 569          *
 570          * Libsysfs now provides a new API sysfs_get_device_bus(), so use it
 571          * if needed
 572          */
 573         if (sysfs_device) {
 574                 if (sysfs_device->bus[0] != '\0')
 575                         goto bus_found;
 576
 577                 loop = 10;
 578                 tspec.tv_nsec = 10000000;
 579                 while (loop--) {
 580                         nanosleep(&tspec, NULL);
 581                         sysfs_get_device_bus(sysfs_device);
 582
 583                         if (sysfs_device->bus[0] != '\0')
 584                                 goto bus_found;
 585                 }
 586                 dbg("timed out waiting to find the device bus, continuing on anyway");
 587                 goto exit;
 588 bus_found:
 589                 dbg("device %s is registered with bus '%s'",
 590                                 sysfs_device->name, sysfs_device->bus);
 591         }
 592 exit:
 593         return sysfs_device;
 594 }
 595
 596 static int match_rule(struct config_device *dev, struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 597 {
 598         while (1) {
 599                 /* check for matching bus value */
 600                 if (dev->bus[0] != '\0') {
 601                         if (sysfs_device == NULL) {
 602                                 dbg("device has no bus");
 603                                 goto try_parent;
 604                         }
 605                         dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 606                         if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
 607                                 dbg(FIELD_BUS " is not matching");
 608                                 goto try_parent;
 609                         } else {
 610                                 dbg(FIELD_BUS " matches");
 611                         }
 612                 }
 613
 614                 /* check for matching kernel name*/
 615                 if (dev->kernel[0] != '\0') {
 616                         dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name);
 617                         if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
 618                                 dbg(FIELD_KERNEL " is not matching");
 619                                 goto try_parent;
 620                         } else {
 621                                 dbg(FIELD_KERNEL " matches");
 622                         }
 623                 }
 624
 625                 /* check for matching bus id */
 626                 if (dev->id[0] != '\0') {
 627                         dbg("check " FIELD_ID);
 628                         if (match_id(dev, class_dev, sysfs_device) != 0) {
 629                                 dbg(FIELD_ID " is not matching");
 630                                 goto try_parent;
 631                         } else {
 632                                 dbg(FIELD_ID " matches");
 633                         }
 634                 }
 635
 636                 /* check for matching place of device */
 637                 if (dev->place[0] != '\0') {
 638                         dbg("check " FIELD_PLACE);
 639                         if (match_place(dev, class_dev, sysfs_device) != 0) {
 640                                 dbg(FIELD_PLACE " is not matching");
 641                                 goto try_parent;
 642                         } else {
 643                                 dbg(FIELD_PLACE " matches");
 644                         }
 645                 }
 646
 647                 /* check for matching sysfs pairs */
 648                 if (dev->sysfs_pair[0].file[0] != '\0') {
 649                         dbg("check " FIELD_SYSFS " pairs");
 650                         if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
 651                                 dbg(FIELD_SYSFS " is not matching");
 652                                 goto try_parent;
 653                         } else {
 654                                 dbg(FIELD_SYSFS " matches");
 655                         }
 656                 }
 657
 658                 /* execute external program */
 659                 if (dev->program[0] != '\0') {
 660                         dbg("check " FIELD_PROGRAM);
 661                         apply_format(udev, dev->program);
 662                         if (execute_program(dev->program, udev->program_result, NAME_SIZE) != 0) {
 663                                 dbg(FIELD_PROGRAM " returned nozero");
 664                                 goto try_parent;
 665                         } else {
 666                                 dbg(FIELD_PROGRAM " returned successful");
 667                         }
 668                 }
 669
 670                 /* check for matching result of external program */
 671                 if (dev->result[0] != '\0') {
 672                         dbg("check for " FIELD_RESULT
 673                             " dev->result='%s', udev->program_result='%s'",
 674                             dev->result, udev->program_result);
 675                         if (strcmp_pattern(dev->result, udev->program_result) != 0) {
 676                                 dbg(FIELD_RESULT " is not matching");
 677                                 goto try_parent;
 678                         } else {
 679                                 dbg(FIELD_RESULT " matches");
 680                         }
 681                 }
 682
 683                 /* Yeah, we matched! */
 684                 return 0;
 685
 686 try_parent:
 687                 dbg("try parent sysfs device");
 688                 sysfs_device = sysfs_get_device_parent(sysfs_device);
 689                 if (sysfs_device == NULL)
 690                         return -ENODEV;
 691                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 692                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 693                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 694         }
 695
 696 }
 697
 698 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 699 {
 700         struct sysfs_device *sysfs_device = NULL;
 701         struct config_device *dev;
 702         struct perm_device *perm;
 703         char *pos;
 704
 705         udev->mode = 0;
 706
 707         /* find the sysfs_device associated with this class device */
 708         sysfs_device = get_sysfs_device(class_dev);
 709         if (sysfs_device) {
 710                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 711                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 712                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 713                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 714                 wait_for_device_to_initialize(sysfs_device);
 715         }
 716         dbg("class_dev->name = '%s'", class_dev->name);
 717
 718         strfieldcpy(udev->kernel_name, class_dev->name);
 719         fix_kernel_name(udev);
 720         dbg("udev->kernel_name = '%s'", udev->kernel_name);
 721
 722         /* get kernel number */
 723         pos = class_dev->name + strlen(class_dev->name);
 724         while (isdigit(*(pos-1)))
 725                 pos--;
 726         strfieldcpy(udev->kernel_number, pos);
 727         dbg("kernel_number='%s'", udev->kernel_number);
 728
 729         /* look for a matching rule to apply */
 730         list_for_each_entry(dev, &config_device_list, node) {
 731                 dbg("process rule");
 732                 if (match_rule(dev, class_dev, udev, sysfs_device) == 0) {
 733                         if (dev->name[0] == '\0') {
 734                                 info("configured rule in '%s' at line %i applied, '%s' is ignored",
 735                                      udev_rules_filename, dev->config_line, udev->kernel_name);
 736                                 return -1;
 737                         }
 738
 739                         info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
 740                              udev_rules_filename, dev->config_line, udev->kernel_name, dev->name);
 741                         strfieldcpy(udev->name, dev->name);
 742                         strfieldcpy(udev->symlink, dev->symlink);
 743                         goto found;
 744                 }
 745         }
 746
 747         /* no rule was found so we use the kernel name */
 748         strfieldcpy(udev->name, udev->kernel_name);
 749         goto done;
 750
 751 found:
 752         /* substitute placeholder */
 753         apply_format(udev, udev->name);
 754         apply_format(udev, udev->symlink);
 755
 756 done:
 757         perm = find_perm(udev->name);
 758         if (perm) {
 759                 udev->mode = perm->mode;
 760                 strfieldcpy(udev->owner, perm->owner);
 761                 strfieldcpy(udev->group, perm->group);
 762         } else {
 763                 /* no matching perms found :( */
 764                 udev->mode = get_default_mode();
 765                 strncpy(udev->owner, get_default_owner(), OWNER_SIZE);
 766                 strncpy(udev->group, get_default_group(), GROUP_SIZE);
 767         }
 768         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 769             udev->name, udev->owner, udev->group, udev->mode);
 770
 771         return 0;
 772 }
 773
 774 int namedev_init(void)
 775 {
 776         int retval;
 777
 778         retval = namedev_init_rules();
 779         if (retval)
 780                 return retval;
 781
 782         retval = namedev_init_permissions();
 783         if (retval)
 784                 return retval;
 785
 786         dump_config_dev_list();
 787         dump_perm_dev_list();
 788         return retval;
 789 }