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', program='%s', bus='%s', id='%s', "
  87                           "owner='%s', group='%s', mode=%#o",
  88                           dev->name, dev->exec_program, dev->bus, 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                 /* get a line */
 421                 temp = fgets(line, sizeof(line), fd);
 422                 if (temp == NULL)
 423                         break;
 424
 425                 dbg_parse("read %s", temp);
 426
 427                 /* eat the whitespace at the beginning of the line */
 428                 while (isspace(*temp))
 429                         ++temp;
 430
 431                 /* empty line? */
 432                 if (*temp == 0x00)
 433                         continue;
 434
 435                 /* see if this is a comment */
 436                 if (*temp == COMMENT_CHARACTER)
 437                         continue;
 438
 439                 memset(&dev, 0x00, sizeof(dev));
 440
 441                 /* parse the line */
 442                 temp2 = strsep(&temp, ":");
 443                 if (!temp2) {
 444                         dbg("cannot parse line: %s", line);
 445                         continue;
 446                 }
 447                 strncpy(dev.name, temp2, sizeof(dev.name));
 448
 449                 temp2 = strsep(&temp, ":");
 450                 if (!temp2) {
 451                         dbg("cannot parse line: %s", line);
 452                         continue;
 453                 }
 454                 strncpy(dev.owner, temp2, sizeof(dev.owner));
 455
 456                 temp2 = strsep(&temp, ":");
 457                 if (!temp2) {
 458                         dbg("cannot parse line: %s", line);
 459                         continue;
 460                 }
 461                 strncpy(dev.group, temp2, sizeof(dev.owner));
 462
 463                 dev.mode = strtol(temp, NULL, 8);
 464
 465                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 466                           dev.name, dev.owner, dev.group,
 467                           dev.mode);
 468                 retval = add_dev(&dev);
 469                 if (retval) {
 470                         dbg("add_dev returned with error %d", retval);
 471                         goto exit;
 472                 }
 473         }
 474
 475 exit:
 476         fclose(fd);
 477         return retval;
 478 }
 479
 480 static mode_t get_default_mode(struct sysfs_class_device *class_dev)
 481 {
 482         /* just default everyone to rw for the world! */
 483         return 0666;
 484 }
 485
 486
 487 static int exec_callout(struct config_device *dev, char *value, int len)
 488 {
 489         int retval;
 490         int res;
 491         int status;
 492         int fds[2];
 493         pid_t pid;
 494         int value_set = 0;
 495         char buffer[256];
 496         char *arg;
 497         char *args[CALLOUT_MAXARG];
 498         int i;
 499
 500         dbg("callout to '%s'", dev->exec_program);
 501         retval = pipe(fds);
 502         if (retval != 0) {
 503                 dbg("pipe failed");
 504                 return -1;
 505         }
 506         pid = fork();
 507         if (pid == -1) {
 508                 dbg("fork failed");
 509                 return -1;
 510         }
 511
 512         if (pid == 0) {
 513                 /* child */
 514                 close(STDOUT_FILENO);
 515                 dup(fds[1]);    /* dup write side of pipe to STDOUT */
 516                 if (strchr(dev->exec_program, ' ')) {
 517                         /* callout with arguments */
 518                         arg = dev->exec_program;
 519                         for (i=0; i < CALLOUT_MAXARG-1; i++) {
 520                                 args[i] = strsep(&arg, " ");
 521                                 if (args[i] == NULL)
 522                                         break;
 523                         }
 524                         if (args[i]) {
 525                                 dbg("to many args - %d", i);
 526                                 args[i] = NULL;
 527                         }
 528                         retval = execve(args[0], args, main_envp);
 529                 } else {
 530                         retval = execve(dev->exec_program, main_argv, main_envp);
 531                 }
 532                 if (retval != 0) {
 533                         dbg("child execve failed");
 534                         exit(1);
 535                 }
 536                 return -1; /* avoid compiler warning */
 537         } else {
 538                 /* parent reads from fds[0] */
 539                 close(fds[1]);
 540                 retval = 0;
 541                 while (1) {
 542                         res = read(fds[0], buffer, sizeof(buffer) - 1);
 543                         if (res <= 0)
 544                                 break;
 545                         buffer[res] = '\0';
 546                         if (res > len) {
 547                                 dbg("callout len %d too short\n", len);
 548                                 retval = -1;
 549                         }
 550                         if (value_set) {
 551                                 dbg("callout value already set");
 552                                 retval = -1;
 553                         } else {
 554                                 value_set = 1;
 555                                 strncpy(value, buffer, len);
 556                         }
 557                 }
 558                 dbg("callout returned '%s'", value);
 559                 close(fds[0]);
 560                 res = wait(&status);
 561                 if (res < 0) {
 562                         dbg("wait failed result %d", res);
 563                         retval = -1;
 564                 }
 565
 566 #ifndef __KLIBC__
 567                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 568                         dbg("callout program status 0x%x", status);
 569                         retval = -1;
 570                 }
 571 #endif
 572         }
 573         return retval;
 574 }
 575
 576 static int do_callout(struct sysfs_class_device *class_dev, struct udevice *udev)
 577 {
 578         struct config_device *dev;
 579         struct list_head *tmp;
 580         char value[ID_SIZE];
 581
 582         list_for_each(tmp, &config_device_list) {
 583                 dev = list_entry(tmp, struct config_device, node);
 584                 if (dev->type != CALLOUT)
 585                         continue;
 586
 587                 if (exec_callout(dev, value, sizeof(value)))
 588                         continue;
 589                 if (strncmp(value, dev->id, sizeof(value)) != 0)
 590                         continue;
 591                 strfieldcpy(udev->name, dev->name);
 592                 if (dev->mode != 0) {
 593                         udev->mode = dev->mode;
 594                         strfieldcpy(udev->owner, dev->owner);
 595                         strfieldcpy(udev->group, dev->group);
 596                 }
 597                 dbg_parse("callout returned matching value '%s', '%s' becomes '%s'"
 598                           " - owner='%s', group='%s', mode =%#o",
 599                           dev->id, class_dev->name, udev->name,
 600                           dev->owner, dev->group, dev->mode);
 601                 return 0;
 602         }
 603         return -ENODEV;
 604 }
 605
 606 static int do_label(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 607 {
 608         struct sysfs_attribute *tmpattr = NULL;
 609         struct config_device *dev;
 610         struct list_head *tmp;
 611
 612         list_for_each(tmp, &config_device_list) {
 613                 dev = list_entry(tmp, struct config_device, node);
 614                 if (dev->type != LABEL)
 615                         continue;
 616
 617                 dbg_parse("look for device attribute '%s'", dev->sysfs_file);
 618                 /* try to find the attribute in the class device directory */
 619                 tmpattr = sysfs_get_classdev_attr(class_dev, dev->sysfs_file);
 620                 if (tmpattr)
 621                         goto label_found;
 622
 623                 /* look in the class device directory if present */
 624                 if (sysfs_device) {
 625                         tmpattr = sysfs_get_device_attr(sysfs_device, dev->sysfs_file);
 626                         if (tmpattr)
 627                                 goto label_found;
 628                 }
 629
 630                 continue;
 631
 632 label_found:
 633                 tmpattr->value[strlen(tmpattr->value)-1] = 0x00;
 634                 dbg_parse("compare attribute '%s' value '%s' with '%s'",
 635                           dev->sysfs_file, tmpattr->value, dev->sysfs_value);
 636                 if (strcmp(dev->sysfs_value, tmpattr->value) != 0)
 637                         continue;
 638
 639                 strfieldcpy(udev->name, dev->name);
 640                 if (dev->mode != 0) {
 641                         udev->mode = dev->mode;
 642                         strfieldcpy(udev->owner, dev->owner);
 643                         strfieldcpy(udev->group, dev->group);
 644                 }
 645                 dbg_parse("found matching attribute '%s', '%s' becomes '%s' "
 646                           "- owner='%s', group='%s', mode=%#o",
 647                           dev->sysfs_file, class_dev->name, udev->name,
 648                           dev->owner, dev->group, dev->mode);
 649
 650                 return 0;
 651         }
 652         return -ENODEV;
 653 }
 654
 655 static int do_number(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 656 {
 657         struct config_device *dev;
 658         struct list_head *tmp;
 659         char path[SYSFS_PATH_MAX];
 660         int found;
 661         char *temp = NULL;
 662
 663         /* we have to have a sysfs device for NUMBER to work */
 664         if (!sysfs_device)
 665                 return -ENODEV;
 666
 667         list_for_each(tmp, &config_device_list) {
 668                 dev = list_entry(tmp, struct config_device, node);
 669                 if (dev->type != NUMBER)
 670                         continue;
 671
 672                 found = 0;
 673                 strfieldcpy(path, sysfs_device->path);
 674                 temp = strrchr(path, '/');
 675                 dbg_parse("search '%s' in '%s', path='%s'", dev->id, temp, path);
 676                 if (strstr(temp, dev->id) != NULL) {
 677                         found = 1;
 678                 } else {
 679                         *temp = 0x00;
 680                         temp = strrchr(path, '/');
 681                         dbg_parse("search '%s' in '%s', path='%s'", dev->id, temp, path);
 682                         if (strstr(temp, dev->id) != NULL)
 683                                 found = 1;
 684                 }
 685                 if (!found)
 686                         continue;
 687                 strfieldcpy(udev->name, dev->name);
 688                 if (dev->mode != 0) {
 689                         udev->mode = dev->mode;
 690                         strfieldcpy(udev->owner, dev->owner);
 691                         strfieldcpy(udev->group, dev->group);
 692                 }
 693                 dbg_parse("found matching id '%s', '%s' becomes '%s'"
 694                           " - owner='%s', group ='%s', mode=%#o",
 695                           dev->id, class_dev->name, udev->name,
 696                           dev->owner, dev->group, dev->mode);
 697                 return 0;
 698         }
 699         return -ENODEV;
 700 }
 701
 702
 703 static int do_topology(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 704 {
 705         struct config_device *dev;
 706         struct list_head *tmp;
 707         char path[SYSFS_PATH_MAX];
 708         int found;
 709         char *temp = NULL;
 710
 711         /* we have to have a sysfs device for TOPOLOGY to work */
 712         if (!sysfs_device)
 713                 return -ENODEV;
 714
 715         list_for_each(tmp, &config_device_list) {
 716                 dev = list_entry(tmp, struct config_device, node);
 717                 if (dev->type != TOPOLOGY)
 718                         continue;
 719
 720                 found = 0;
 721                 strfieldcpy(path, sysfs_device->path);
 722                 temp = strrchr(path, '/');
 723                 dbg_parse("search '%s' in '%s', path='%s'", dev->place, temp, path);
 724                 if (strstr(temp, dev->place) != NULL) {
 725                         found = 1;
 726                 } else {
 727                         *temp = 0x00;
 728                         temp = strrchr(path, '/');
 729                         dbg_parse("search '%s' in '%s', path='%s'", dev->place, temp, path);
 730                         if (strstr(temp, dev->place) != NULL)
 731                                 found = 1;
 732                 }
 733                 if (!found)
 734                         continue;
 735
 736                 strfieldcpy(udev->name, dev->name);
 737                 if (dev->mode != 0) {
 738                         udev->mode = dev->mode;
 739                         strfieldcpy(udev->owner, dev->owner);
 740                         strfieldcpy(udev->group, dev->group);
 741                 }
 742                 dbg_parse("found matching place '%s', '%s' becomes '%s'"
 743                           " - owner='%s', group ='%s', mode=%#o",
 744                           dev->place, class_dev->name, udev->name,
 745                           dev->owner, dev->group, dev->mode);
 746                 return 0;
 747         }
 748         return -ENODEV;
 749 }
 750
 751 static int do_replace(struct sysfs_class_device *class_dev, struct udevice *udev)
 752 {
 753         struct config_device *dev;
 754         struct list_head *tmp;
 755
 756         list_for_each(tmp, &config_device_list) {
 757                 dev = list_entry(tmp, struct config_device, node);
 758                 if (dev->type != REPLACE)
 759                         continue;
 760
 761                 dbg_parse("compare name '%s' with '%s'",
 762                           dev->kernel_name, dev->name);
 763                 if (strcmp(dev->kernel_name, class_dev->name) != 0)
 764                         continue;
 765
 766                 strfieldcpy(udev->name, dev->name);
 767                 if (dev->mode != 0) {
 768                         udev->mode = dev->mode;
 769                         strfieldcpy(udev->owner, dev->owner);
 770                         strfieldcpy(udev->group, dev->group);
 771                 }
 772                 dbg_parse("found name, '%s' becomes '%s' - owner='%s', group='%s', mode = %#o",
 773                           dev->kernel_name, udev->name,
 774                           dev->owner, dev->group, dev->mode);
 775
 776                 return 0;
 777         }
 778         return -ENODEV;
 779 }
 780
 781 static void do_kernelname(struct sysfs_class_device *class_dev, struct udevice *udev)
 782 {
 783         struct config_device *dev;
 784         struct list_head *tmp;
 785         int len;
 786
 787         strfieldcpy(udev->name, class_dev->name);
 788         list_for_each(tmp, &config_device_list) {
 789                 dev = list_entry(tmp, struct config_device, node);
 790                 len = strlen(dev->name);
 791                 if (dev->name[len-1] == '*') {
 792                         len--;
 793                         if (strncmp(dev->name, class_dev->name, len))
 794                                 continue;
 795                 } else {
 796                         if (strcmp(dev->name, class_dev->name))
 797                                 continue;
 798                 }
 799                 if (dev->mode != 0) {
 800                         dbg_parse("found permissions for '%s'", class_dev->name);
 801                         udev->mode = dev->mode;
 802                         strfieldcpy(udev->owner, dev->owner);
 803                         strfieldcpy(udev->group, dev->group);
 804                 }
 805         }
 806 }
 807
 808 static int get_attr(struct sysfs_class_device *class_dev, struct udevice *udev)
 809 {
 810         struct sysfs_device *sysfs_device = NULL;
 811         struct sysfs_class_device *class_dev_parent = NULL;
 812         int retval = 0;
 813         char *temp = NULL;
 814
 815         udev->mode = 0;
 816
 817         /* find the sysfs_device for this class device */
 818         /* Wouldn't it really be nice if libsysfs could do this for us? */
 819         if (class_dev->sysdevice) {
 820                 sysfs_device = class_dev->sysdevice;
 821         } else {
 822                 /* bah, let's go backwards up a level to see if the device is there,
 823                  * as block partitions don't point to the physical device.  Need to fix that
 824                  * up in the kernel...
 825                  */
 826                 if (strstr(class_dev->path, "block")) {
 827                         dbg_parse("looking at block device...");
 828                         if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
 829                                 char path[SYSFS_PATH_MAX];
 830
 831                                 dbg_parse("really is a partition...");
 832                                 strfieldcpy(path, class_dev->path);
 833                                 temp = strrchr(path, '/');
 834                                 *temp = 0x00;
 835                                 dbg_parse("looking for a class device at '%s'", path);
 836                                 class_dev_parent = sysfs_open_class_device(path);
 837                                 if (class_dev_parent == NULL) {
 838                                         dbg("sysfs_open_class_device at '%s' failed", path);
 839                                 } else {
 840                                         dbg_parse("class_dev_parent->name=%s", class_dev_parent->name);
 841                                         if (class_dev_parent->sysdevice)
 842                                                 sysfs_device = class_dev_parent->sysdevice;
 843                                 }
 844                         }
 845                 }
 846         }
 847
 848         if (sysfs_device) {
 849                 dbg_parse("sysfs_device->path='%s'", sysfs_device->path);
 850                 dbg_parse("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 851         } else {
 852                 dbg_parse("class_dev->name = '%s'", class_dev->name);
 853         }
 854
 855         /* rules are looked at in priority order */
 856         retval = do_callout(class_dev, udev);
 857         if (retval == 0)
 858                 goto found;
 859
 860         retval = do_label(class_dev, udev, sysfs_device);
 861         if (retval == 0)
 862                 goto found;
 863
 864         retval = do_number(class_dev, udev, sysfs_device);
 865         if (retval == 0)
 866                 goto found;
 867
 868         retval = do_topology(class_dev, udev, sysfs_device);
 869         if (retval == 0)
 870                 goto found;
 871
 872         retval = do_replace(class_dev, udev);
 873         if (retval == 0)
 874                 goto found;
 875
 876         do_kernelname(class_dev, udev);
 877         goto done;
 878
 879 found:
 880         /* substitute placeholder in NAME  */
 881         while (1) {
 882                 char *pos = strchr(udev->name, '%');
 883                 char *dig;
 884                 char name[NAME_SIZE];
 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("bus_id inserted: %s",
 894                                                 sysfs_device->bus_id);
 895                                 break;
 896                         case 'n':
 897                                 dig = class_dev->name + strlen(class_dev->name);
 898                                 while (isdigit(*(dig-1)))
 899                                         dig--;
 900                                 strcat(udev->name, dig);
 901                                 dbg("substitute kernel number '%s'", dig);
 902                                 break;
 903                         case 'm':
 904                                 sprintf(pos, "%u", udev->minor);
 905                                 dbg("substitute minor number '%u'", udev->minor);
 906                                 break;
 907                         case 'M':
 908                                 sprintf(pos, "%u", udev->major);
 909                                 dbg("substitute major number '%u'", udev->major);
 910                                 break;
 911                         default:
 912                                 dbg("unknown substitution type '%%%c'", pos[1]);
 913                                 break;
 914                         }
 915                         strcat(udev->name, name);
 916                 } else
 917                         break;
 918         }
 919
 920 done:
 921         /* mode was never set above */
 922         if (!udev->mode) {
 923                 udev->mode = get_default_mode(class_dev);
 924                 udev->owner[0] = 0x00;
 925                 udev->group[0] = 0x00;
 926         }
 927
 928         if (class_dev_parent)
 929                 sysfs_close_class_device(class_dev_parent);
 930
 931         return 0;
 932 }
 933
 934 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *dev)
 935 {
 936         int retval;
 937
 938         retval = get_attr(class_dev, dev);
 939         if (retval)
 940                 dbg("get_attr failed");
 941
 942         return retval;
 943 }
 944
 945 int namedev_init(void)
 946 {
 947         int retval;
 948
 949         retval = namedev_init_config();
 950         if (retval)
 951                 return retval;
 952
 953         retval = namedev_init_permissions();
 954         if (retval)
 955                 return retval;
 956
 957         dump_dev_list();
 958         return retval;
 959 }
 960
 961