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 /* s2 may end with '*' to match everything */
  54 static int strncmp_wildcard(char *s1, char *s2, int max)
  55 {
  56         int len = strlen(s2);
  57         if (len > max)
  58                 len = max;
  59         if (s2[len-1] == '*')
  60                 len--;
  61         else
  62                 len = max;
  63         return strncmp(s1, s2, len);
  64 }
  65
  66 static void dump_dev(struct config_device *dev)
  67 {
  68         switch (dev->type) {
  69         case KERNEL_NAME:
  70                 dbg_parse("KERNEL name='%s' ,"
  71                           "owner='%s', group='%s', mode=%#o",
  72                           dev->name, dev->owner, dev->group, dev->mode);
  73                 break;
  74         case LABEL:
  75                 dbg_parse("LABEL name='%s', bus='%s', sysfs_file='%s', sysfs_value='%s', "
  76                           "owner='%s', group='%s', mode=%#o",
  77                           dev->name, dev->bus, dev->sysfs_file, dev->sysfs_value,
  78                           dev->owner, dev->group, dev->mode);
  79                 break;
  80         case NUMBER:
  81                 dbg_parse("NUMBER name='%s', bus='%s', id='%s', "
  82                           "owner='%s', group='%s', mode=%#o",
  83                           dev->name, dev->bus, dev->id,
  84                           dev->owner, dev->group, dev->mode);
  85                 break;
  86         case TOPOLOGY:
  87                 dbg_parse("TOPOLOGY name='%s', bus='%s', place='%s', "
  88                           "owner='%s', group='%s', mode=%#o",
  89                           dev->name, dev->bus, dev->place,
  90                           dev->owner, dev->group, dev->mode);
  91                 break;
  92         case REPLACE:
  93                 dbg_parse("REPLACE name=%s, kernel_name=%s, "
  94                           "owner='%s', group='%s', mode=%#o",
  95                           dev->name, dev->kernel_name,
  96                           dev->owner, dev->group, dev->mode);
  97                 break;
  98         case CALLOUT:
  99                 dbg_parse("CALLOUT name='%s', bus='%s', program='%s', id='%s', "
 100                           "owner='%s', group='%s', mode=%#o",
 101                           dev->name, dev->bus, dev->exec_program, dev->id,
 102                           dev->owner, dev->group, dev->mode);
 103                 break;
 104         default:
 105                 dbg_parse("unknown type of method");
 106         }
 107 }
 108
 109 #define copy_var(a, b, var)             \
 110         if (b->var)                     \
 111                 a->var = b->var;
 112
 113 #define copy_string(a, b, var)          \
 114         if (strlen(b->var))             \
 115                 strcpy(a->var, b->var);
 116
 117 static int add_dev(struct config_device *new_dev)
 118 {
 119         struct list_head *tmp;
 120         struct config_device *tmp_dev;
 121
 122         /* update the values if we already have the device */
 123         list_for_each(tmp, &config_device_list) {
 124                 struct config_device *dev = list_entry(tmp, struct config_device, node);
 125                 if (strncmp_wildcard(dev->name, new_dev->name, sizeof(dev->name)))
 126                         continue;
 127                 copy_var(dev, new_dev, type);
 128                 copy_var(dev, new_dev, mode);
 129                 copy_string(dev, new_dev, bus);
 130                 copy_string(dev, new_dev, sysfs_file);
 131                 copy_string(dev, new_dev, sysfs_value);
 132                 copy_string(dev, new_dev, id);
 133                 copy_string(dev, new_dev, place);
 134                 copy_string(dev, new_dev, kernel_name);
 135                 copy_string(dev, new_dev, owner);
 136                 copy_string(dev, new_dev, group);
 137                 return 0;
 138         }
 139
 140         /* not found, add new structure to the device list */
 141         tmp_dev = malloc(sizeof(*tmp_dev));
 142         if (!tmp_dev)
 143                 return -ENOMEM;
 144         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 145         list_add(&tmp_dev->node, &config_device_list);
 146         //dump_dev(tmp_dev);
 147         return 0;
 148 }
 149
 150 static void dump_dev_list(void)
 151 {
 152         struct list_head *tmp;
 153
 154         list_for_each(tmp, &config_device_list) {
 155                 struct config_device *dev = list_entry(tmp, struct config_device, node);
 156                 dump_dev(dev);
 157         }
 158 }
 159
 160 static int get_pair(char **orig_string, char **left, char **right)
 161 {
 162         char *temp;
 163         char *string = *orig_string;
 164
 165         if (!string)
 166                 return -ENODEV;
 167
 168         /* eat any whitespace */
 169         while (isspace(*string))
 170                 ++string;
 171
 172         /* split based on '=' */
 173         temp = strsep(&string, "=");
 174         *left = temp;
 175         if (!string)
 176                 return -ENODEV;
 177
 178         /* take the right side and strip off the '"' */
 179         while (isspace(*string))
 180                 ++string;
 181         if (*string == '"')
 182                 ++string;
 183         else
 184                 return -ENODEV;
 185
 186         temp = strsep(&string, "\"");
 187         if (!string || *temp == '\0')
 188                 return -ENODEV;
 189         *right = temp;
 190         *orig_string = string;
 191
 192         return 0;
 193 }
 194
 195 static int get_value(const char *left, char **orig_string, char **ret_string)
 196 {
 197         int retval;
 198         char *left_string;
 199
 200         retval = get_pair(orig_string, &left_string, ret_string);
 201         if (retval)
 202                 return retval;
 203         if (strcasecmp(left_string, left) != 0)
 204                 return -ENODEV;
 205         return 0;
 206 }
 207
 208 static int namedev_init_config(void)
 209 {
 210         char line[255];
 211         int lineno;
 212         char *temp;
 213         char *temp2;
 214         char *temp3;
 215         FILE *fd;
 216         int retval = 0;
 217         struct config_device dev;
 218
 219         dbg("opening %s to read as config", udev_config_filename);
 220         fd = fopen(udev_config_filename, "r");
 221         if (fd == NULL) {
 222                 dbg("can't open %s", udev_config_filename);
 223                 return -ENODEV;
 224         }
 225
 226         /* loop through the whole file */
 227         lineno = 0;
 228         while (1) {
 229                 /* get a line */
 230                 temp = fgets(line, sizeof(line), fd);
 231                 if (temp == NULL)
 232                         goto exit;
 233                 lineno++;
 234
 235                 dbg_parse("read %s", temp);
 236
 237                 /* eat the whitespace at the beginning of the line */
 238                 while (isspace(*temp))
 239                         ++temp;
 240
 241                 /* empty line? */
 242                 if (*temp == 0x00)
 243                         continue;
 244
 245                 /* see if this is a comment */
 246                 if (*temp == COMMENT_CHARACTER)
 247                         continue;
 248
 249                 memset(&dev, 0x00, sizeof(struct config_device));
 250
 251                 /* parse the line */
 252                 temp2 = strsep(&temp, ",");
 253                 if (strcasecmp(temp2, TYPE_LABEL) == 0) {
 254                         /* label type */
 255                         dev.type = LABEL;
 256
 257                         /* BUS="bus" */
 258                         retval = get_value("BUS", &temp, &temp3);
 259                         if (retval)
 260                                 break;
 261                         strfieldcpy(dev.bus, temp3);
 262
 263                         /* file="value" */
 264                         temp2 = strsep(&temp, ",");
 265                         retval = get_pair(&temp, &temp2, &temp3);
 266                         if (retval)
 267                                 break;
 268                         strfieldcpy(dev.sysfs_file, temp2);
 269                         strfieldcpy(dev.sysfs_value, temp3);
 270
 271                         /* NAME="new_name" */
 272                         temp2 = strsep(&temp, ",");
 273                         retval = get_value("NAME", &temp, &temp3);
 274                         if (retval)
 275                                 break;
 276                         strfieldcpy(dev.name, temp3);
 277
 278                         dbg_parse("LABEL name='%s', bus='%s', "
 279                                   "sysfs_file='%s', sysfs_value='%s'",
 280                                   dev.name, dev.bus, dev.sysfs_file,
 281                                   dev.sysfs_value);
 282                 }
 283
 284                 if (strcasecmp(temp2, TYPE_NUMBER) == 0) {
 285                         /* number type */
 286                         dev.type = NUMBER;
 287
 288                         /* BUS="bus" */
 289                         retval = get_value("BUS", &temp, &temp3);
 290                         if (retval)
 291                                 break;
 292                         strfieldcpy(dev.bus, temp3);
 293
 294                         /* ID="id" */
 295                         temp2 = strsep(&temp, ",");
 296                         retval = get_value("ID", &temp, &temp3);
 297                         if (retval)
 298                                 break;
 299                         strfieldcpy(dev.id, temp3);
 300
 301                         /* NAME="new_name" */
 302                         temp2 = strsep(&temp, ",");
 303                         retval = get_value("NAME", &temp, &temp3);
 304                         if (retval)
 305                                 break;
 306                         strfieldcpy(dev.name, temp3);
 307
 308                         dbg_parse("NUMBER name='%s', bus='%s', id='%s'",
 309                                   dev.name, dev.bus, dev.id);
 310                 }
 311
 312                 if (strcasecmp(temp2, TYPE_TOPOLOGY) == 0) {
 313                         /* number type */
 314                         dev.type = TOPOLOGY;
 315
 316                         /* BUS="bus" */
 317                         retval = get_value("BUS", &temp, &temp3);
 318                         if (retval)
 319                                 break;
 320                         strfieldcpy(dev.bus, temp3);
 321
 322                         /* PLACE="place" */
 323                         temp2 = strsep(&temp, ",");
 324                         retval = get_value("PLACE", &temp, &temp3);
 325                         if (retval)
 326                                 break;
 327                         strfieldcpy(dev.place, temp3);
 328
 329                         /* NAME="new_name" */
 330                         temp2 = strsep(&temp, ",");
 331                         retval = get_value("NAME", &temp, &temp3);
 332                         if (retval)
 333                                 break;
 334                         strfieldcpy(dev.name, temp3);
 335
 336                         dbg_parse("TOPOLOGY name='%s', bus='%s', place='%s'",
 337                                   dev.name, dev.bus, dev.place);
 338                 }
 339
 340                 if (strcasecmp(temp2, TYPE_REPLACE) == 0) {
 341                         /* number type */
 342                         dev.type = REPLACE;
 343
 344                         /* KERNEL="kernel_name" */
 345                         retval = get_value("KERNEL", &temp, &temp3);
 346                         if (retval)
 347                                 break;
 348                         strfieldcpy(dev.kernel_name, temp3);
 349
 350                         /* NAME="new_name" */
 351                         temp2 = strsep(&temp, ",");
 352                         retval = get_value("NAME", &temp, &temp3);
 353                         if (retval)
 354                                 break;
 355                         strfieldcpy(dev.name, temp3);
 356                         dbg_parse("REPLACE name='%s', kernel_name='%s'",
 357                                   dev.name, dev.kernel_name);
 358                 }
 359                 if (strcasecmp(temp2, TYPE_CALLOUT) == 0) {
 360                         /* number type */
 361                         dev.type = CALLOUT;
 362
 363                         /* BUS="bus" */
 364                         retval = get_value("BUS", &temp, &temp3);
 365                         if (retval)
 366                                 break;
 367                         strfieldcpy(dev.bus, temp3);
 368
 369                         /* PROGRAM="executable" */
 370                         temp2 = strsep(&temp, ",");
 371                         retval = get_value("PROGRAM", &temp, &temp3);
 372                         if (retval)
 373                                 break;
 374                         strfieldcpy(dev.exec_program, temp3);
 375
 376                         /* ID="id" */
 377                         temp2 = strsep(&temp, ",");
 378                         retval = get_value("ID", &temp, &temp3);
 379                         if (retval)
 380                                 break;
 381                         strfieldcpy(dev.id, temp3);
 382
 383                         /* NAME="new_name" */
 384                         temp2 = strsep(&temp, ",");
 385                         retval = get_value("NAME", &temp, &temp3);
 386                         if (retval)
 387                                 break;
 388                         strfieldcpy(dev.name, temp3);
 389                         dbg_parse("CALLOUT name='%s', program='%s'",
 390                                   dev.name, dev.exec_program);
 391                 }
 392
 393                 retval = add_dev(&dev);
 394                 if (retval) {
 395                         dbg("add_dev returned with error %d", retval);
 396                         goto exit;
 397                 }
 398         }
 399         dbg_parse("%s:%d:%Zd: error parsing '%s'", udev_config_filename,
 400                   lineno, temp - line, temp);
 401 exit:
 402         fclose(fd);
 403         return retval;
 404 }
 405
 406
 407 static int namedev_init_permissions(void)
 408 {
 409         char line[255];
 410         char *temp;
 411         char *temp2;
 412         FILE *fd;
 413         int retval = 0;
 414         struct config_device dev;
 415
 416         dbg("opening %s to read as permissions config", udev_config_permission_filename);
 417         fd = fopen(udev_config_permission_filename, "r");
 418         if (fd == NULL) {
 419                 dbg("can't open %s", udev_config_permission_filename);
 420                 return -ENODEV;
 421         }
 422
 423         /* loop through the whole file */
 424         while (1) {
 425                 temp = fgets(line, sizeof(line), fd);
 426                 if (temp == NULL)
 427                         break;
 428
 429                 dbg_parse("read %s", temp);
 430
 431                 /* eat the whitespace at the beginning of the line */
 432                 while (isspace(*temp))
 433                         ++temp;
 434
 435                 /* empty line? */
 436                 if (*temp == 0x00)
 437                         continue;
 438
 439                 /* see if this is a comment */
 440                 if (*temp == COMMENT_CHARACTER)
 441                         continue;
 442
 443                 memset(&dev, 0x00, sizeof(dev));
 444
 445                 /* parse the line */
 446                 temp2 = strsep(&temp, ":");
 447                 if (!temp2) {
 448                         dbg("cannot parse line: %s", line);
 449                         continue;
 450                 }
 451                 strncpy(dev.name, temp2, sizeof(dev.name));
 452
 453                 temp2 = strsep(&temp, ":");
 454                 if (!temp2) {
 455                         dbg("cannot parse line: %s", line);
 456                         continue;
 457                 }
 458                 strncpy(dev.owner, temp2, sizeof(dev.owner));
 459
 460                 temp2 = strsep(&temp, ":");
 461                 if (!temp2) {
 462                         dbg("cannot parse line: %s", line);
 463                         continue;
 464                 }
 465                 strncpy(dev.group, temp2, sizeof(dev.owner));
 466
 467                 dev.mode = strtol(temp, NULL, 8);
 468
 469                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 470                           dev.name, dev.owner, dev.group,
 471                           dev.mode);
 472                 retval = add_dev(&dev);
 473                 if (retval) {
 474                         dbg("add_dev returned with error %d", retval);
 475                         goto exit;
 476                 }
 477         }
 478
 479 exit:
 480         fclose(fd);
 481         return retval;
 482 }
 483
 484 static mode_t get_default_mode(struct sysfs_class_device *class_dev)
 485 {
 486         /* just default everyone to rw for the world! */
 487         return 0666;
 488 }
 489
 490
 491 static int exec_callout(struct config_device *dev, char *value, int len)
 492 {
 493         int retval;
 494         int res;
 495         int status;
 496         int fds[2];
 497         pid_t pid;
 498         int value_set = 0;
 499         char buffer[256];
 500         char *arg;
 501         char *args[CALLOUT_MAXARG];
 502         int i;
 503
 504         dbg("callout to '%s'", dev->exec_program);
 505         retval = pipe(fds);
 506         if (retval != 0) {
 507                 dbg("pipe failed");
 508                 return -1;
 509         }
 510         pid = fork();
 511         if (pid == -1) {
 512                 dbg("fork failed");
 513                 return -1;
 514         }
 515
 516         if (pid == 0) {
 517                 /* child */
 518                 close(STDOUT_FILENO);
 519                 dup(fds[1]);    /* dup write side of pipe to STDOUT */
 520                 if (strchr(dev->exec_program, ' ')) {
 521                         /* callout with arguments */
 522                         arg = dev->exec_program;
 523                         for (i=0; i < CALLOUT_MAXARG-1; i++) {
 524                                 args[i] = strsep(&arg, " ");
 525                                 if (args[i] == NULL)
 526                                         break;
 527                         }
 528                         if (args[i]) {
 529                                 dbg("too many args - %d", i);
 530                                 args[i] = NULL;
 531                         }
 532                         retval = execve(args[0], args, main_envp);
 533                 } else {
 534                         retval = execve(dev->exec_program, main_argv, main_envp);
 535                 }
 536                 if (retval != 0) {
 537                         dbg("child execve failed");
 538                         exit(1);
 539                 }
 540                 return -1; /* avoid compiler warning */
 541         } else {
 542                 /* parent reads from fds[0] */
 543                 close(fds[1]);
 544                 retval = 0;
 545                 while (1) {
 546                         res = read(fds[0], buffer, sizeof(buffer) - 1);
 547                         if (res <= 0)
 548                                 break;
 549                         buffer[res] = '\0';
 550                         if (res > len) {
 551                                 dbg("callout len %d too short\n", len);
 552                                 retval = -1;
 553                         }
 554                         if (value_set) {
 555                                 dbg("callout value already set");
 556                                 retval = -1;
 557                         } else {
 558                                 value_set = 1;
 559                                 strncpy(value, buffer, len);
 560                         }
 561                 }
 562                 dbg("callout returned '%s'", value);
 563                 close(fds[0]);
 564                 res = wait(&status);
 565                 if (res < 0) {
 566                         dbg("wait failed result %d", res);
 567                         retval = -1;
 568                 }
 569
 570 #ifndef __KLIBC__
 571                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 572                         dbg("callout program status 0x%x", status);
 573                         retval = -1;
 574                 }
 575 #endif
 576         }
 577         return retval;
 578 }
 579
 580 static int do_callout(struct sysfs_class_device *class_dev, struct udevice *udev, char *value, int len)
 581 {
 582         struct config_device *dev;
 583         struct list_head *tmp;
 584
 585         list_for_each(tmp, &config_device_list) {
 586                 dev = list_entry(tmp, struct config_device, node);
 587                 if (dev->type != CALLOUT)
 588                         continue;
 589                 if (exec_callout(dev, value, len))
 590                         continue;
 591                 if (strncmp_wildcard(value, dev->id, len) != 0)
 592                         continue;
 593                 strfieldcpy(udev->name, dev->name);
 594                 if (dev->mode != 0) {
 595                         udev->mode = dev->mode;
 596                         strfieldcpy(udev->owner, dev->owner);
 597                         strfieldcpy(udev->group, dev->group);
 598                 }
 599                 dbg_parse("callout returned matching value '%s', '%s' becomes '%s'"
 600                           " - owner='%s', group='%s', mode =%#o",
 601                           dev->id, class_dev->name, udev->name,
 602                           dev->owner, dev->group, dev->mode);
 603                 return 0;
 604         }
 605         return -ENODEV;
 606 }
 607
 608 static int do_label(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 609 {
 610         struct sysfs_attribute *tmpattr = NULL;
 611         struct config_device *dev;
 612         struct list_head *tmp;
 613
 614         list_for_each(tmp, &config_device_list) {
 615                 dev = list_entry(tmp, struct config_device, node);
 616                 if (dev->type != LABEL)
 617                         continue;
 618
 619                 dbg_parse("look for device attribute '%s'", dev->sysfs_file);
 620                 /* try to find the attribute in the class device directory */
 621                 tmpattr = sysfs_get_classdev_attr(class_dev, dev->sysfs_file);
 622                 if (tmpattr)
 623                         goto label_found;
 624
 625                 /* look in the class device directory if present */
 626                 if (sysfs_device) {
 627                         tmpattr = sysfs_get_device_attr(sysfs_device, dev->sysfs_file);
 628                         if (tmpattr)
 629                                 goto label_found;
 630                 }
 631
 632                 continue;
 633
 634 label_found:
 635                 tmpattr->value[strlen(tmpattr->value)-1] = 0x00;
 636                 dbg_parse("compare attribute '%s' value '%s' with '%s'",
 637                           dev->sysfs_file, tmpattr->value, dev->sysfs_value);
 638                 if (strcmp(dev->sysfs_value, tmpattr->value) != 0)
 639                         continue;
 640
 641                 strfieldcpy(udev->name, dev->name);
 642                 if (dev->mode != 0) {
 643                         udev->mode = dev->mode;
 644                         strfieldcpy(udev->owner, dev->owner);
 645                         strfieldcpy(udev->group, dev->group);
 646                 }
 647                 dbg_parse("found matching attribute '%s', '%s' becomes '%s' "
 648                           "- owner='%s', group='%s', mode=%#o",
 649                           dev->sysfs_file, class_dev->name, udev->name,
 650                           dev->owner, dev->group, dev->mode);
 651
 652                 return 0;
 653         }
 654         return -ENODEV;
 655 }
 656
 657 static int do_number(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 658 {
 659         struct config_device *dev;
 660         struct list_head *tmp;
 661         char path[SYSFS_PATH_MAX];
 662         int found;
 663         char *temp = NULL;
 664
 665         /* we have to have a sysfs device for NUMBER to work */
 666         if (!sysfs_device)
 667                 return -ENODEV;
 668
 669         list_for_each(tmp, &config_device_list) {
 670                 dev = list_entry(tmp, struct config_device, node);
 671                 if (dev->type != NUMBER)
 672                         continue;
 673
 674                 found = 0;
 675                 strfieldcpy(path, sysfs_device->path);
 676                 temp = strrchr(path, '/');
 677                 dbg_parse("search '%s' in '%s', path='%s'", dev->id, temp, path);
 678                 if (strstr(temp, dev->id) != NULL) {
 679                         found = 1;
 680                 } else {
 681                         *temp = 0x00;
 682                         temp = strrchr(path, '/');
 683                         dbg_parse("search '%s' in '%s', path='%s'", dev->id, temp, path);
 684                         if (strstr(temp, dev->id) != NULL)
 685                                 found = 1;
 686                 }
 687                 if (!found)
 688                         continue;
 689                 strfieldcpy(udev->name, dev->name);
 690                 if (dev->mode != 0) {
 691                         udev->mode = dev->mode;
 692                         strfieldcpy(udev->owner, dev->owner);
 693                         strfieldcpy(udev->group, dev->group);
 694                 }
 695                 dbg_parse("found matching id '%s', '%s' becomes '%s'"
 696                           " - owner='%s', group ='%s', mode=%#o",
 697                           dev->id, class_dev->name, udev->name,
 698                           dev->owner, dev->group, dev->mode);
 699                 return 0;
 700         }
 701         return -ENODEV;
 702 }
 703
 704
 705 static int do_topology(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 706 {
 707         struct config_device *dev;
 708         struct list_head *tmp;
 709         char path[SYSFS_PATH_MAX];
 710         int found;
 711         char *temp = NULL;
 712
 713         /* we have to have a sysfs device for TOPOLOGY to work */
 714         if (!sysfs_device)
 715                 return -ENODEV;
 716
 717         list_for_each(tmp, &config_device_list) {
 718                 dev = list_entry(tmp, struct config_device, node);
 719                 if (dev->type != TOPOLOGY)
 720                         continue;
 721
 722                 found = 0;
 723                 strfieldcpy(path, sysfs_device->path);
 724                 temp = strrchr(path, '/');
 725                 dbg_parse("search '%s' in '%s', path='%s'", dev->place, temp, path);
 726                 if (strstr(temp, dev->place) != NULL) {
 727                         found = 1;
 728                 } else {
 729                         *temp = 0x00;
 730                         temp = strrchr(path, '/');
 731                         dbg_parse("search '%s' in '%s', path='%s'", dev->place, temp, path);
 732                         if (strstr(temp, dev->place) != NULL)
 733                                 found = 1;
 734                 }
 735                 if (!found)
 736                         continue;
 737
 738                 strfieldcpy(udev->name, dev->name);
 739                 if (dev->mode != 0) {
 740                         udev->mode = dev->mode;
 741                         strfieldcpy(udev->owner, dev->owner);
 742                         strfieldcpy(udev->group, dev->group);
 743                 }
 744                 dbg_parse("found matching place '%s', '%s' becomes '%s'"
 745                           " - owner='%s', group ='%s', mode=%#o",
 746                           dev->place, class_dev->name, udev->name,
 747                           dev->owner, dev->group, dev->mode);
 748                 return 0;
 749         }
 750         return -ENODEV;
 751 }
 752
 753 static int do_replace(struct sysfs_class_device *class_dev, struct udevice *udev)
 754 {
 755         struct config_device *dev;
 756         struct list_head *tmp;
 757
 758         list_for_each(tmp, &config_device_list) {
 759                 dev = list_entry(tmp, struct config_device, node);
 760                 if (dev->type != REPLACE)
 761                         continue;
 762
 763                 dbg_parse("compare name '%s' with '%s'",
 764                           dev->kernel_name, dev->name);
 765                 if (strcmp(dev->kernel_name, class_dev->name) != 0)
 766                         continue;
 767
 768                 strfieldcpy(udev->name, dev->name);
 769                 if (dev->mode != 0) {
 770                         udev->mode = dev->mode;
 771                         strfieldcpy(udev->owner, dev->owner);
 772                         strfieldcpy(udev->group, dev->group);
 773                 }
 774                 dbg_parse("found name, '%s' becomes '%s' - owner='%s', group='%s', mode = %#o",
 775                           dev->kernel_name, udev->name,
 776                           dev->owner, dev->group, dev->mode);
 777
 778                 return 0;
 779         }
 780         return -ENODEV;
 781 }
 782
 783 static void do_kernelname(struct sysfs_class_device *class_dev, struct udevice *udev)
 784 {
 785         struct config_device *dev;
 786         struct list_head *tmp;
 787         int len;
 788
 789         strfieldcpy(udev->name, class_dev->name);
 790         /* look for permissions */
 791         list_for_each(tmp, &config_device_list) {
 792                 dev = list_entry(tmp, struct config_device, node);
 793                 len = strlen(dev->name);
 794                 if (strncmp_wildcard(class_dev->name, dev->name, sizeof(dev->name)))
 795                         continue;
 796                 if (dev->mode != 0) {
 797                         dbg_parse("found permissions for '%s'", class_dev->name);
 798                         udev->mode = dev->mode;
 799                         strfieldcpy(udev->owner, dev->owner);
 800                         strfieldcpy(udev->group, dev->group);
 801                 }
 802         }
 803 }
 804
 805 static int get_attr(struct sysfs_class_device *class_dev, struct udevice *udev)
 806 {
 807         struct sysfs_device *sysfs_device = NULL;
 808         struct sysfs_class_device *class_dev_parent = NULL;
 809         int retval = 0;
 810         char *temp = NULL;
 811         char value[ID_SIZE];
 812
 813         udev->mode = 0;
 814
 815         /* find the sysfs_device for this class device */
 816         /* Wouldn't it really be nice if libsysfs could do this for us? */
 817         if (class_dev->sysdevice) {
 818                 sysfs_device = class_dev->sysdevice;
 819         } else {
 820                 /* bah, let's go backwards up a level to see if the device is there,
 821                  * as block partitions don't point to the physical device.  Need to fix that
 822                  * up in the kernel...
 823                  */
 824                 if (strstr(class_dev->path, "block")) {
 825                         dbg_parse("looking at block device...");
 826                         if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
 827                                 char path[SYSFS_PATH_MAX];
 828
 829                                 dbg_parse("really is a partition...");
 830                                 strfieldcpy(path, class_dev->path);
 831                                 temp = strrchr(path, '/');
 832                                 *temp = 0x00;
 833                                 dbg_parse("looking for a class device at '%s'", path);
 834                                 class_dev_parent = sysfs_open_class_device(path);
 835                                 if (class_dev_parent == NULL) {
 836                                         dbg("sysfs_open_class_device at '%s' failed", path);
 837                                 } else {
 838                                         dbg_parse("class_dev_parent->name=%s", class_dev_parent->name);
 839                                         if (class_dev_parent->sysdevice)
 840                                                 sysfs_device = class_dev_parent->sysdevice;
 841                                 }
 842                         }
 843                 }
 844         }
 845
 846         if (sysfs_device) {
 847                 dbg_parse("sysfs_device->path='%s'", sysfs_device->path);
 848                 dbg_parse("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 849         } else {
 850                 dbg_parse("class_dev->name = '%s'", class_dev->name);
 851         }
 852
 853         /* rules are looked at in priority order */
 854         retval = do_callout(class_dev, udev, value, sizeof(value));
 855         if (retval == 0)
 856                 goto found;
 857
 858         retval = do_label(class_dev, udev, sysfs_device);
 859         if (retval == 0)
 860                 goto found;
 861
 862         retval = do_number(class_dev, udev, sysfs_device);
 863         if (retval == 0)
 864                 goto found;
 865
 866         retval = do_topology(class_dev, udev, sysfs_device);
 867         if (retval == 0)
 868                 goto found;
 869
 870         retval = do_replace(class_dev, udev);
 871         if (retval == 0)
 872                 goto found;
 873
 874         do_kernelname(class_dev, udev);
 875         goto done;
 876
 877 found:
 878         /* substitute placeholder in NAME  */
 879         while (1) {
 880                 char *pos = strchr(udev->name, '%');
 881                 char *dig;
 882                 char name[NAME_SIZE];
 883
 884                 if (pos) {
 885                         strfieldcpy(name, pos+2);
 886                         *pos = 0x00;
 887                         switch (pos[1]) {
 888                         case 'b':
 889                                 if (!sysfs_device)
 890                                         break;
 891                                 strcat(udev->name, sysfs_device->bus_id);
 892                                 dbg("substitute bus_id '%s'", sysfs_device->bus_id);
 893                                 break;
 894                         case 'n':
 895                                 dig = class_dev->name + strlen(class_dev->name);
 896                                 while (isdigit(*(dig-1)))
 897                                         dig--;
 898                                 strcat(pos, dig);
 899                                 dbg("substitute kernel number '%s'", dig);
 900                                 break;
 901                         case 'm':
 902                                 sprintf(pos, "%u", udev->minor);
 903                                 dbg("substitute minor number '%u'", udev->minor);
 904                                 break;
 905                         case 'M':
 906                                 sprintf(pos, "%u", udev->major);
 907                                 dbg("substitute major number '%u'", udev->major);
 908                                 break;
 909                         case 'c':
 910                                 strcat(pos, value);
 911                                 dbg("substitute callout output '%s'", value);
 912                                 break;
 913                         default:
 914                                 dbg("unknown substitution type '%%%c'", pos[1]);
 915                                 break;
 916                         }
 917                         strcat(udev->name, name);
 918                 } else
 919                         break;
 920         }
 921
 922 done:
 923         /* mode was never set above */
 924         if (!udev->mode) {
 925                 udev->mode = get_default_mode(class_dev);
 926                 udev->owner[0] = 0x00;
 927                 udev->group[0] = 0x00;
 928         }
 929
 930         if (class_dev_parent)
 931                 sysfs_close_class_device(class_dev_parent);
 932
 933         return 0;
 934 }
 935
 936 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *dev)
 937 {
 938         int retval;
 939
 940         retval = get_attr(class_dev, dev);
 941         if (retval)
 942                 dbg("get_attr failed");
 943
 944         return retval;
 945 }
 946
 947 int namedev_init(void)
 948 {
 949         int retval;
 950
 951         retval = namedev_init_config();
 952         if (retval)
 953                 return retval;
 954
 955         retval = namedev_init_permissions();
 956         if (retval)
 957                 return retval;
 958
 959         dump_dev_list();
 960         return retval;
 961 }