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 /* define this to enable parsing debugging */
  25 /* #define DEBUG_PARSER */
  26
  27 #include <stddef.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <stdio.h>
  31 #include <fcntl.h>
  32 #include <ctype.h>
  33 #include <unistd.h>
  34 #include <errno.h>
  35 #include <sys/wait.h>
  36
  37 #include "list.h"
  38 #include "udev.h"
  39 #include "udev_version.h"
  40 #include "namedev.h"
  41 #include "libsysfs/libsysfs.h"
  42 #include "klibc_fixups.h"
  43
  44 #define TYPE_LABEL      "LABEL"
  45 #define TYPE_NUMBER     "NUMBER"
  46 #define TYPE_TOPOLOGY   "TOPOLOGY"
  47 #define TYPE_REPLACE    "REPLACE"
  48 #define TYPE_CALLOUT    "CALLOUT"
  49 #define CALLOUT_MAXARG  8
  50
  51 static LIST_HEAD(config_device_list);
  52
  53 static void dump_dev(struct config_device *dev)
  54 {
  55         switch (dev->type) {
  56         case KERNEL_NAME:
  57                 dbg_parse("KERNEL name='%s' ,"
  58                           "owner='%s', group='%s', mode=%#o",
  59                           dev->name, dev->owner, dev->group, dev->mode);
  60                 break;
  61         case LABEL:
  62                 dbg_parse("LABEL name='%s', bus='%s', sysfs_file='%s', sysfs_value='%s', "
  63                           "owner='%s', group='%s', mode=%#o",
  64                           dev->name, dev->bus, dev->sysfs_file, dev->sysfs_value,
  65                           dev->owner, dev->group, dev->mode);
  66                 break;
  67         case NUMBER:
  68                 dbg_parse("NUMBER name='%s', bus='%s', id='%s', "
  69                           "owner='%s', group='%s', mode=%#o",
  70                           dev->name, dev->bus, dev->id,
  71                           dev->owner, dev->group, dev->mode);
  72                 break;
  73         case TOPOLOGY:
  74                 dbg_parse("TOPOLOGY name='%s', bus='%s', place='%s', "
  75                           "owner='%s', group='%s', mode=%#o",
  76                           dev->name, dev->bus, dev->place,
  77                           dev->owner, dev->group, dev->mode);
  78                 break;
  79         case REPLACE:
  80                 dbg_parse("REPLACE name=%s, kernel_name=%s, "
  81                           "owner='%s', group='%s', mode=%#o",
  82                           dev->name, dev->kernel_name,
  83                           dev->owner, dev->group, dev->mode);
  84                 break;
  85         case CALLOUT:
  86                 dbg_parse("CALLOUT name='%s', bus='%s', program='%s', id='%s', "
  87                           "owner='%s', group='%s', mode=%#o",
  88                           dev->name, dev->bus, dev->exec_program, dev->id,
  89                           dev->owner, dev->group, dev->mode);
  90                 break;
  91         default:
  92                 dbg_parse("unknown type of method");
  93         }
  94 }
  95
  96 #define copy_var(a, b, var)             \
  97         if (b->var)                     \
  98                 a->var = b->var;
  99
 100 #define copy_string(a, b, var)          \
 101         if (strlen(b->var))             \
 102                 strcpy(a->var, b->var);
 103
 104 static int add_dev(struct config_device *new_dev)
 105 {
 106         struct list_head *tmp;
 107         struct config_device *tmp_dev;
 108
 109         /* update the values if we already have the device */
 110         list_for_each(tmp, &config_device_list) {
 111                 struct config_device *dev = list_entry(tmp, struct config_device, node);
 112                 int len = strlen(new_dev->name);
 113                 if (new_dev->name[len-1] == '*') {
 114                         len--;
 115                         if (strncmp(dev->name, new_dev->name, len))
 116                                 continue;
 117                 } else {
 118                         if (strcmp(dev->name, new_dev->name))
 119                                 continue;
 120                 }
 121                 /* the same, copy the new info into this structure */
 122                 copy_var(dev, new_dev, type);
 123                 copy_var(dev, new_dev, mode);
 124                 copy_string(dev, new_dev, bus);
 125                 copy_string(dev, new_dev, sysfs_file);
 126                 copy_string(dev, new_dev, sysfs_value);
 127                 copy_string(dev, new_dev, id);
 128                 copy_string(dev, new_dev, place);
 129                 copy_string(dev, new_dev, kernel_name);
 130                 copy_string(dev, new_dev, owner);
 131                 copy_string(dev, new_dev, group);
 132                 return 0;
 133         }
 134
 135         /* not found, add new structure to the device list */
 136         tmp_dev = malloc(sizeof(*tmp_dev));
 137         if (!tmp_dev)
 138                 return -ENOMEM;
 139         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 140         list_add(&tmp_dev->node, &config_device_list);
 141         //dump_dev(tmp_dev);
 142         return 0;
 143 }
 144
 145 static void dump_dev_list(void)
 146 {
 147         struct list_head *tmp;
 148
 149         list_for_each(tmp, &config_device_list) {
 150                 struct config_device *dev = list_entry(tmp, struct config_device, node);
 151                 dump_dev(dev);
 152         }
 153 }
 154
 155 static int get_pair(char **orig_string, char **left, char **right)
 156 {
 157         char *temp;
 158         char *string = *orig_string;
 159
 160         if (!string)
 161                 return -ENODEV;
 162
 163         /* eat any whitespace */
 164         while (isspace(*string))
 165                 ++string;
 166
 167         /* split based on '=' */
 168         temp = strsep(&string, "=");
 169         *left = temp;
 170         if (!string)
 171                 return -ENODEV;
 172
 173         /* take the right side and strip off the '"' */
 174         while (isspace(*string))
 175                 ++string;
 176         if (*string == '"')
 177                 ++string;
 178         else
 179                 return -ENODEV;
 180
 181         temp = strsep(&string, "\"");
 182         if (!string || *temp == '\0')
 183                 return -ENODEV;
 184         *right = temp;
 185         *orig_string = string;
 186
 187         return 0;
 188 }
 189
 190 static int get_value(const char *left, char **orig_string, char **ret_string)
 191 {
 192         int retval;
 193         char *left_string;
 194
 195         retval = get_pair(orig_string, &left_string, ret_string);
 196         if (retval)
 197                 return retval;
 198         if (strcasecmp(left_string, left) != 0)
 199                 return -ENODEV;
 200         return 0;
 201 }
 202
 203 static int namedev_init_config(void)
 204 {
 205         char line[255];
 206         int lineno;
 207         char *temp;
 208         char *temp2;
 209         char *temp3;
 210         FILE *fd;
 211         int retval = 0;
 212         struct config_device dev;
 213
 214         dbg("opening %s to read as config", udev_config_filename);
 215         fd = fopen(udev_config_filename, "r");
 216         if (fd == NULL) {
 217                 dbg("can't open %s", udev_config_filename);
 218                 return -ENODEV;
 219         }
 220
 221         /* loop through the whole file */
 222         lineno = 0;
 223         while (1) {
 224                 /* get a line */
 225                 temp = fgets(line, sizeof(line), fd);
 226                 if (temp == NULL)
 227                         goto exit;
 228                 lineno++;
 229
 230                 dbg_parse("read %s", temp);
 231
 232                 /* eat the whitespace at the beginning of the line */
 233                 while (isspace(*temp))
 234                         ++temp;
 235
 236                 /* empty line? */
 237                 if (*temp == 0x00)
 238                         continue;
 239
 240                 /* see if this is a comment */
 241                 if (*temp == COMMENT_CHARACTER)
 242                         continue;
 243
 244                 memset(&dev, 0x00, sizeof(struct config_device));
 245
 246                 /* parse the line */
 247                 temp2 = strsep(&temp, ",");
 248                 if (strcasecmp(temp2, TYPE_LABEL) == 0) {
 249                         /* label type */
 250                         dev.type = LABEL;
 251
 252                         /* BUS="bus" */
 253                         retval = get_value("BUS", &temp, &temp3);
 254                         if (retval)
 255                                 break;
 256                         strfieldcpy(dev.bus, temp3);
 257
 258                         /* file="value" */
 259                         temp2 = strsep(&temp, ",");
 260                         retval = get_pair(&temp, &temp2, &temp3);
 261                         if (retval)
 262                                 break;
 263                         strfieldcpy(dev.sysfs_file, temp2);
 264                         strfieldcpy(dev.sysfs_value, temp3);
 265
 266                         /* NAME="new_name" */
 267                         temp2 = strsep(&temp, ",");
 268                         retval = get_value("NAME", &temp, &temp3);
 269                         if (retval)
 270                                 break;
 271                         strfieldcpy(dev.name, temp3);
 272
 273                         dbg_parse("LABEL name='%s', bus='%s', "
 274                                   "sysfs_file='%s', sysfs_value='%s'",
 275                                   dev.name, dev.bus, dev.sysfs_file,
 276                                   dev.sysfs_value);
 277                 }
 278
 279                 if (strcasecmp(temp2, TYPE_NUMBER) == 0) {
 280                         /* number type */
 281                         dev.type = NUMBER;
 282
 283                         /* BUS="bus" */
 284                         retval = get_value("BUS", &temp, &temp3);
 285                         if (retval)
 286                                 break;
 287                         strfieldcpy(dev.bus, temp3);
 288
 289                         /* ID="id" */
 290                         temp2 = strsep(&temp, ",");
 291                         retval = get_value("ID", &temp, &temp3);
 292                         if (retval)
 293                                 break;
 294                         strfieldcpy(dev.id, temp3);
 295
 296                         /* NAME="new_name" */
 297                         temp2 = strsep(&temp, ",");
 298                         retval = get_value("NAME", &temp, &temp3);
 299                         if (retval)
 300                                 break;
 301                         strfieldcpy(dev.name, temp3);
 302
 303                         dbg_parse("NUMBER name='%s', bus='%s', id='%s'",
 304                                   dev.name, dev.bus, dev.id);
 305                 }
 306
 307                 if (strcasecmp(temp2, TYPE_TOPOLOGY) == 0) {
 308                         /* number type */
 309                         dev.type = TOPOLOGY;
 310
 311                         /* BUS="bus" */
 312                         retval = get_value("BUS", &temp, &temp3);
 313                         if (retval)
 314                                 break;
 315                         strfieldcpy(dev.bus, temp3);
 316
 317                         /* PLACE="place" */
 318                         temp2 = strsep(&temp, ",");
 319                         retval = get_value("PLACE", &temp, &temp3);
 320                         if (retval)
 321                                 break;
 322                         strfieldcpy(dev.place, temp3);
 323
 324                         /* NAME="new_name" */
 325                         temp2 = strsep(&temp, ",");
 326                         retval = get_value("NAME", &temp, &temp3);
 327                         if (retval)
 328                                 break;
 329                         strfieldcpy(dev.name, temp3);
 330
 331                         dbg_parse("TOPOLOGY name='%s', bus='%s', place='%s'",
 332                                   dev.name, dev.bus, dev.place);
 333                 }
 334
 335                 if (strcasecmp(temp2, TYPE_REPLACE) == 0) {
 336                         /* number type */
 337                         dev.type = REPLACE;
 338
 339                         /* KERNEL="kernel_name" */
 340                         retval = get_value("KERNEL", &temp, &temp3);
 341                         if (retval)
 342                                 break;
 343                         strfieldcpy(dev.kernel_name, temp3);
 344
 345                         /* NAME="new_name" */
 346                         temp2 = strsep(&temp, ",");
 347                         retval = get_value("NAME", &temp, &temp3);
 348                         if (retval)
 349                                 break;
 350                         strfieldcpy(dev.name, temp3);
 351                         dbg_parse("REPLACE name='%s', kernel_name='%s'",
 352                                   dev.name, dev.kernel_name);
 353                 }
 354                 if (strcasecmp(temp2, TYPE_CALLOUT) == 0) {
 355                         /* number type */
 356                         dev.type = CALLOUT;
 357
 358                         /* BUS="bus" */
 359                         retval = get_value("BUS", &temp, &temp3);
 360                         if (retval)
 361                                 break;
 362                         strfieldcpy(dev.bus, temp3);
 363
 364                         /* PROGRAM="executable" */
 365                         temp2 = strsep(&temp, ",");
 366                         retval = get_value("PROGRAM", &temp, &temp3);
 367                         if (retval)
 368                                 break;
 369                         strfieldcpy(dev.exec_program, temp3);
 370
 371                         /* ID="id" */
 372                         temp2 = strsep(&temp, ",");
 373                         retval = get_value("ID", &temp, &temp3);
 374                         if (retval)
 375                                 break;
 376                         strfieldcpy(dev.id, temp3);
 377
 378                         /* NAME="new_name" */
 379                         temp2 = strsep(&temp, ",");
 380                         retval = get_value("NAME", &temp, &temp3);
 381                         if (retval)
 382                                 break;
 383                         strfieldcpy(dev.name, temp3);
 384                         dbg_parse("CALLOUT name='%s', program='%s'",
 385                                   dev.name, dev.exec_program);
 386                 }
 387
 388                 retval = add_dev(&dev);
 389                 if (retval) {
 390                         dbg("add_dev returned with error %d", retval);
 391                         goto exit;
 392                 }
 393         }
 394         dbg_parse("%s:%d:%Zd: error parsing '%s'", udev_config_filename,
 395                   lineno, temp - line, temp);
 396 exit:
 397         fclose(fd);
 398         return retval;
 399 }
 400
 401
 402 static int namedev_init_permissions(void)
 403 {
 404         char line[255];
 405         char *temp;
 406         char *temp2;
 407         FILE *fd;
 408         int retval = 0;
 409         struct config_device dev;
 410
 411         dbg("opening %s to read as permissions config", udev_config_permission_filename);
 412         fd = fopen(udev_config_permission_filename, "r");
 413         if (fd == NULL) {
 414                 dbg("can't open %s", udev_config_permission_filename);
 415                 return -ENODEV;
 416         }
 417
 418         /* loop through the whole file */
 419         while (1) {
 420                 temp = fgets(line, sizeof(line), fd);
 421                 if (temp == NULL)
 422                         break;
 423
 424                 dbg_parse("read %s", temp);
 425
 426                 /* eat the whitespace at the beginning of the line */
 427                 while (isspace(*temp))
 428                         ++temp;
 429
 430                 /* empty line? */
 431                 if (*temp == 0x00)
 432                         continue;
 433
 434                 /* see if this is a comment */
 435                 if (*temp == COMMENT_CHARACTER)
 436                         continue;
 437
 438                 memset(&dev, 0x00, sizeof(dev));
 439
 440                 /* parse the line */
 441                 temp2 = strsep(&temp, ":");
 442                 if (!temp2) {
 443                         dbg("cannot parse line: %s", line);
 444                         continue;
 445                 }
 446                 strncpy(dev.name, temp2, sizeof(dev.name));
 447
 448                 temp2 = strsep(&temp, ":");
 449                 if (!temp2) {
 450                         dbg("cannot parse line: %s", line);
 451                         continue;
 452                 }
 453                 strncpy(dev.owner, temp2, sizeof(dev.owner));
 454
 455                 temp2 = strsep(&temp, ":");
 456                 if (!temp2) {
 457                         dbg("cannot parse line: %s", line);
 458                         continue;
 459                 }
 460                 strncpy(dev.group, temp2, sizeof(dev.owner));
 461
 462                 dev.mode = strtol(temp, NULL, 8);
 463
 464                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 465                           dev.name, dev.owner, dev.group,
 466                           dev.mode);
 467                 retval = add_dev(&dev);
 468                 if (retval) {
 469                         dbg("add_dev returned with error %d", retval);
 470                         goto exit;
 471                 }
 472         }
 473
 474 exit:
 475         fclose(fd);
 476         return retval;
 477 }
 478
 479 static mode_t get_default_mode(struct sysfs_class_device *class_dev)
 480 {
 481         /* just default everyone to rw for the world! */
 482         return 0666;
 483 }
 484
 485
 486 static int exec_callout(struct config_device *dev, char *value, int len)
 487 {
 488         int retval;
 489         int res;
 490         int status;
 491         int fds[2];
 492         pid_t pid;
 493         int value_set = 0;
 494         char buffer[256];
 495         char *arg;
 496         char *args[CALLOUT_MAXARG];
 497         int i;
 498
 499         dbg("callout to '%s'", dev->exec_program);
 500         retval = pipe(fds);
 501         if (retval != 0) {
 502                 dbg("pipe failed");
 503                 return -1;
 504         }
 505         pid = fork();
 506         if (pid == -1) {
 507                 dbg("fork failed");
 508                 return -1;
 509         }
 510
 511         if (pid == 0) {
 512                 /* child */
 513                 close(STDOUT_FILENO);
 514                 dup(fds[1]);    /* dup write side of pipe to STDOUT */
 515                 if (strchr(dev->exec_program, ' ')) {
 516                         /* callout with arguments */
 517                         arg = dev->exec_program;
 518                         for (i=0; i < CALLOUT_MAXARG-1; i++) {
 519                                 args[i] = strsep(&arg, " ");
 520                                 if (args[i] == NULL)
 521                                         break;
 522                         }
 523                         if (args[i]) {
 524                                 dbg("too many args - %d", i);
 525                                 args[i] = NULL;
 526                         }
 527                         retval = execve(args[0], args, main_envp);
 528                 } else {
 529                         retval = execve(dev->exec_program, main_argv, main_envp);
 530                 }
 531                 if (retval != 0) {
 532                         dbg("child execve failed");
 533                         exit(1);
 534                 }
 535                 return -1; /* avoid compiler warning */
 536         } else {
 537                 /* parent reads from fds[0] */
 538                 close(fds[1]);
 539                 retval = 0;
 540                 while (1) {
 541                         res = read(fds[0], buffer, sizeof(buffer) - 1);
 542                         if (res <= 0)
 543                                 break;
 544                         buffer[res] = '\0';
 545                         if (res > len) {
 546                                 dbg("callout len %d too short\n", len);
 547                                 retval = -1;
 548                         }
 549                         if (value_set) {
 550                                 dbg("callout value already set");
 551                                 retval = -1;
 552                         } else {
 553                                 value_set = 1;
 554                                 strncpy(value, buffer, len);
 555                         }
 556                 }
 557                 dbg("callout returned '%s'", value);
 558                 close(fds[0]);
 559                 res = wait(&status);
 560                 if (res < 0) {
 561                         dbg("wait failed result %d", res);
 562                         retval = -1;
 563                 }
 564
 565 #ifndef __KLIBC__
 566                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 567                         dbg("callout program status 0x%x", status);
 568                         retval = -1;
 569                 }
 570 #endif
 571         }
 572         return retval;
 573 }
 574
 575 static int do_callout(struct sysfs_class_device *class_dev, struct udevice *udev)
 576 {
 577         struct config_device *dev;
 578         struct list_head *tmp;
 579         char value[ID_SIZE];
 580
 581         list_for_each(tmp, &config_device_list) {
 582                 dev = list_entry(tmp, struct config_device, node);
 583                 if (dev->type != CALLOUT)
 584                         continue;
 585
 586                 if (exec_callout(dev, value, sizeof(value)))
 587                         continue;
 588                 if (strncmp(value, dev->id, sizeof(value)) != 0)
 589                         continue;
 590                 strfieldcpy(udev->name, dev->name);
 591                 if (dev->mode != 0) {
 592                         udev->mode = dev->mode;
 593                         strfieldcpy(udev->owner, dev->owner);
 594                         strfieldcpy(udev->group, dev->group);
 595                 }
 596                 dbg_parse("callout returned matching value '%s', '%s' becomes '%s'"
 597                           " - owner='%s', group='%s', mode =%#o",
 598                           dev->id, class_dev->name, udev->name,
 599                           dev->owner, dev->group, dev->mode);
 600                 return 0;
 601         }
 602         return -ENODEV;
 603 }
 604
 605 static int do_label(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 606 {
 607         struct sysfs_attribute *tmpattr = NULL;
 608         struct config_device *dev;
 609         struct list_head *tmp;
 610
 611         list_for_each(tmp, &config_device_list) {
 612                 dev = list_entry(tmp, struct config_device, node);
 613                 if (dev->type != LABEL)
 614                         continue;
 615
 616                 dbg_parse("look for device attribute '%s'", dev->sysfs_file);
 617                 /* try to find the attribute in the class device directory */
 618                 tmpattr = sysfs_get_classdev_attr(class_dev, dev->sysfs_file);
 619                 if (tmpattr)
 620                         goto label_found;
 621
 622                 /* look in the class device directory if present */
 623                 if (sysfs_device) {
 624                         tmpattr = sysfs_get_device_attr(sysfs_device, dev->sysfs_file);
 625                         if (tmpattr)
 626                                 goto label_found;
 627                 }
 628
 629                 continue;
 630
 631 label_found:
 632                 tmpattr->value[strlen(tmpattr->value)-1] = 0x00;
 633                 dbg_parse("compare attribute '%s' value '%s' with '%s'",
 634                           dev->sysfs_file, tmpattr->value, dev->sysfs_value);
 635                 if (strcmp(dev->sysfs_value, tmpattr->value) != 0)
 636                         continue;
 637
 638                 strfieldcpy(udev->name, dev->name);
 639                 if (dev->mode != 0) {
 640                         udev->mode = dev->mode;
 641                         strfieldcpy(udev->owner, dev->owner);
 642                         strfieldcpy(udev->group, dev->group);
 643                 }
 644                 dbg_parse("found matching attribute '%s', '%s' becomes '%s' "
 645                           "- owner='%s', group='%s', mode=%#o",
 646                           dev->sysfs_file, class_dev->name, udev->name,
 647                           dev->owner, dev->group, dev->mode);
 648
 649                 return 0;
 650         }
 651         return -ENODEV;
 652 }
 653
 654 static int do_number(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 655 {
 656         struct config_device *dev;
 657         struct list_head *tmp;
 658         char path[SYSFS_PATH_MAX];
 659         int found;
 660         char *temp = NULL;
 661
 662         /* we have to have a sysfs device for NUMBER to work */
 663         if (!sysfs_device)
 664                 return -ENODEV;
 665
 666         list_for_each(tmp, &config_device_list) {
 667                 dev = list_entry(tmp, struct config_device, node);
 668                 if (dev->type != NUMBER)
 669                         continue;
 670
 671                 found = 0;
 672                 strfieldcpy(path, sysfs_device->path);
 673                 temp = strrchr(path, '/');
 674                 dbg_parse("search '%s' in '%s', path='%s'", dev->id, temp, path);
 675                 if (strstr(temp, dev->id) != NULL) {
 676                         found = 1;
 677                 } else {
 678                         *temp = 0x00;
 679                         temp = strrchr(path, '/');
 680                         dbg_parse("search '%s' in '%s', path='%s'", dev->id, temp, path);
 681                         if (strstr(temp, dev->id) != NULL)
 682                                 found = 1;
 683                 }
 684                 if (!found)
 685                         continue;
 686                 strfieldcpy(udev->name, dev->name);
 687                 if (dev->mode != 0) {
 688                         udev->mode = dev->mode;
 689                         strfieldcpy(udev->owner, dev->owner);
 690                         strfieldcpy(udev->group, dev->group);
 691                 }
 692                 dbg_parse("found matching id '%s', '%s' becomes '%s'"
 693                           " - owner='%s', group ='%s', mode=%#o",
 694                           dev->id, class_dev->name, udev->name,
 695                           dev->owner, dev->group, dev->mode);
 696                 return 0;
 697         }
 698         return -ENODEV;
 699 }
 700
 701
 702 static int do_topology(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 703 {
 704         struct config_device *dev;
 705         struct list_head *tmp;
 706         char path[SYSFS_PATH_MAX];
 707         int found;
 708         char *temp = NULL;
 709
 710         /* we have to have a sysfs device for TOPOLOGY to work */
 711         if (!sysfs_device)
 712                 return -ENODEV;
 713
 714         list_for_each(tmp, &config_device_list) {
 715                 dev = list_entry(tmp, struct config_device, node);
 716                 if (dev->type != TOPOLOGY)
 717                         continue;
 718
 719                 found = 0;
 720                 strfieldcpy(path, sysfs_device->path);
 721                 temp = strrchr(path, '/');
 722                 dbg_parse("search '%s' in '%s', path='%s'", dev->place, temp, path);
 723                 if (strstr(temp, dev->place) != NULL) {
 724                         found = 1;
 725                 } else {
 726                         *temp = 0x00;
 727                         temp = strrchr(path, '/');
 728                         dbg_parse("search '%s' in '%s', path='%s'", dev->place, temp, path);
 729                         if (strstr(temp, dev->place) != NULL)
 730                                 found = 1;
 731                 }
 732                 if (!found)
 733                         continue;
 734
 735                 strfieldcpy(udev->name, dev->name);
 736                 if (dev->mode != 0) {
 737                         udev->mode = dev->mode;
 738                         strfieldcpy(udev->owner, dev->owner);
 739                         strfieldcpy(udev->group, dev->group);
 740                 }
 741                 dbg_parse("found matching place '%s', '%s' becomes '%s'"
 742                           " - owner='%s', group ='%s', mode=%#o",
 743                           dev->place, class_dev->name, udev->name,
 744                           dev->owner, dev->group, dev->mode);
 745                 return 0;
 746         }
 747         return -ENODEV;
 748 }
 749
 750 static int do_replace(struct sysfs_class_device *class_dev, struct udevice *udev)
 751 {
 752         struct config_device *dev;
 753         struct list_head *tmp;
 754
 755         list_for_each(tmp, &config_device_list) {
 756                 dev = list_entry(tmp, struct config_device, node);
 757                 if (dev->type != REPLACE)
 758                         continue;
 759
 760                 dbg_parse("compare name '%s' with '%s'",
 761                           dev->kernel_name, dev->name);
 762                 if (strcmp(dev->kernel_name, class_dev->name) != 0)
 763                         continue;
 764
 765                 strfieldcpy(udev->name, dev->name);
 766                 if (dev->mode != 0) {
 767                         udev->mode = dev->mode;
 768                         strfieldcpy(udev->owner, dev->owner);
 769                         strfieldcpy(udev->group, dev->group);
 770                 }
 771                 dbg_parse("found name, '%s' becomes '%s' - owner='%s', group='%s', mode = %#o",
 772                           dev->kernel_name, udev->name,
 773                           dev->owner, dev->group, dev->mode);
 774
 775                 return 0;
 776         }
 777         return -ENODEV;
 778 }
 779
 780 static void do_kernelname(struct sysfs_class_device *class_dev, struct udevice *udev)
 781 {
 782         struct config_device *dev;
 783         struct list_head *tmp;
 784         int len;
 785
 786         strfieldcpy(udev->name, class_dev->name);
 787         list_for_each(tmp, &config_device_list) {
 788                 dev = list_entry(tmp, struct config_device, node);
 789                 len = strlen(dev->name);
 790                 if (dev->name[len-1] == '*') {
 791                         len--;
 792                         if (strncmp(dev->name, class_dev->name, len))
 793                                 continue;
 794                 } else {
 795                         if (strcmp(dev->name, class_dev->name))
 796                                 continue;
 797                 }
 798                 if (dev->mode != 0) {
 799                         dbg_parse("found permissions for '%s'", class_dev->name);
 800                         udev->mode = dev->mode;
 801                         strfieldcpy(udev->owner, dev->owner);
 802                         strfieldcpy(udev->group, dev->group);
 803                 }
 804         }
 805 }
 806
 807 static int get_attr(struct sysfs_class_device *class_dev, struct udevice *udev)
 808 {
 809         struct sysfs_device *sysfs_device = NULL;
 810         struct sysfs_class_device *class_dev_parent = NULL;
 811         int retval = 0;
 812         char *temp = NULL;
 813
 814         udev->mode = 0;
 815
 816         /* find the sysfs_device for this class device */
 817         /* Wouldn't it really be nice if libsysfs could do this for us? */
 818         if (class_dev->sysdevice) {
 819                 sysfs_device = class_dev->sysdevice;
 820         } else {
 821                 /* bah, let's go backwards up a level to see if the device is there,
 822                  * as block partitions don't point to the physical device.  Need to fix that
 823                  * up in the kernel...
 824                  */
 825                 if (strstr(class_dev->path, "block")) {
 826                         dbg_parse("looking at block device...");
 827                         if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
 828                                 char path[SYSFS_PATH_MAX];
 829
 830                                 dbg_parse("really is a partition...");
 831                                 strfieldcpy(path, class_dev->path);
 832                                 temp = strrchr(path, '/');
 833                                 *temp = 0x00;
 834                                 dbg_parse("looking for a class device at '%s'", path);
 835                                 class_dev_parent = sysfs_open_class_device(path);
 836                                 if (class_dev_parent == NULL) {
 837                                         dbg("sysfs_open_class_device at '%s' failed", path);
 838                                 } else {
 839                                         dbg_parse("class_dev_parent->name=%s", class_dev_parent->name);
 840                                         if (class_dev_parent->sysdevice)
 841                                                 sysfs_device = class_dev_parent->sysdevice;
 842                                 }
 843                         }
 844                 }
 845         }
 846
 847         if (sysfs_device) {
 848                 dbg_parse("sysfs_device->path='%s'", sysfs_device->path);
 849                 dbg_parse("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 850         } else {
 851                 dbg_parse("class_dev->name = '%s'", class_dev->name);
 852         }
 853
 854         /* rules are looked at in priority order */
 855         retval = do_callout(class_dev, udev);
 856         if (retval == 0)
 857                 goto found;
 858
 859         retval = do_label(class_dev, udev, sysfs_device);
 860         if (retval == 0)
 861                 goto found;
 862
 863         retval = do_number(class_dev, udev, sysfs_device);
 864         if (retval == 0)
 865                 goto found;
 866
 867         retval = do_topology(class_dev, udev, sysfs_device);
 868         if (retval == 0)
 869                 goto found;
 870
 871         retval = do_replace(class_dev, udev);
 872         if (retval == 0)
 873                 goto found;
 874
 875         do_kernelname(class_dev, udev);
 876         goto done;
 877
 878 found:
 879         /* substitute placeholder in NAME  */
 880         while (1) {
 881                 char *pos = strchr(udev->name, '%');
 882                 char *dig;
 883                 char name[NAME_SIZE];
 884
 885                 if (pos) {
 886                         strfieldcpy(name, pos+2);
 887                         *pos = 0x00;
 888                         switch (pos[1]) {
 889                         case 'b':
 890                                 if (!sysfs_device)
 891                                         break;
 892                                 strcat(udev->name, sysfs_device->bus_id);
 893                                 dbg("substitute bus_id '%s'", sysfs_device->bus_id);
 894                                 break;
 895                         case 'n':
 896                                 dig = class_dev->name + strlen(class_dev->name);
 897                                 while (isdigit(*(dig-1)))
 898                                         dig--;
 899                                 strcat(udev->name, dig);
 900                                 dbg("substitute kernel number '%s'", dig);
 901                                 break;
 902                         case 'm':
 903                                 sprintf(pos, "%u", udev->minor);
 904                                 dbg("substitute minor number '%u'", udev->minor);
 905                                 break;
 906                         case 'M':
 907                                 sprintf(pos, "%u", udev->major);
 908                                 dbg("substitute major number '%u'", udev->major);
 909                                 break;
 910                         default:
 911                                 dbg("unknown substitution type '%%%c'", pos[1]);
 912                                 break;
 913                         }
 914                         strcat(udev->name, name);
 915                 } else
 916                         break;
 917         }
 918
 919 done:
 920         /* mode was never set above */
 921         if (!udev->mode) {
 922                 udev->mode = get_default_mode(class_dev);
 923                 udev->owner[0] = 0x00;
 924                 udev->group[0] = 0x00;
 925         }
 926
 927         if (class_dev_parent)
 928                 sysfs_close_class_device(class_dev_parent);
 929
 930         return 0;
 931 }
 932
 933 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *dev)
 934 {
 935         int retval;
 936
 937         retval = get_attr(class_dev, dev);
 938         if (retval)
 939                 dbg("get_attr failed");
 940
 941         return retval;
 942 }
 943
 944 int namedev_init(void)
 945 {
 946         int retval;
 947
 948         retval = namedev_init_config();
 949         if (retval)
 950                 return retval;
 951
 952         retval = namedev_init_permissions();
 953         if (retval)
 954                 return retval;
 955
 956         dump_dev_list();
 957         return retval;
 958 }