drivers/sbus/char/openprom.c

   1 /*
   2  * Linux/SPARC PROM Configuration Driver
   3  * Copyright (C) 1996 Thomas K. Dyas (tdyas@noc.rutgers.edu)
   4  * Copyright (C) 1996 Eddie C. Dost  (ecd@skynet.be)
   5  *
   6  * This character device driver allows user programs to access the
   7  * PROM device tree. It is compatible with the SunOS /dev/openprom
   8  * driver and the NetBSD /dev/openprom driver. The SunOS eeprom
   9  * utility works without any modifications.
  10  *
  11  * The driver uses a minor number under the misc device major. The
  12  * file read/write mode determines the type of access to the PROM.
  13  * Interrupts are disabled whenever the driver calls into the PROM for
  14  * sanity's sake.
  15  */
  16
  17 /* This program is free software; you can redistribute it and/or
  18  * modify it under the terms of the GNU General Public License as
  19  * published by the Free Software Foundation; either version 2 of the
  20  * License, or (at your option) any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful, but
  23  * WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  25  * General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  30  */
  31
  32 #include <linux/module.h>
  33 #include <linux/kernel.h>
  34 #include <linux/errno.h>
  35 #include <linux/slab.h>
  36 #include <linux/mutex.h>
  37 #include <linux/string.h>
  38 #include <linux/miscdevice.h>
  39 #include <linux/init.h>
  40 #include <linux/fs.h>
  41 #include <asm/oplib.h>
  42 #include <asm/prom.h>
  43 #include <linux/uaccess.h>
  44 #include <asm/openpromio.h>
  45 #ifdef CONFIG_PCI
  46 #include <linux/pci.h>
  47 #endif
  48
  49 MODULE_AUTHOR("Thomas K. Dyas (tdyas@noc.rutgers.edu) and Eddie C. Dost  (ecd@skynet.be)");
  50 MODULE_DESCRIPTION("OPENPROM Configuration Driver");
  51 MODULE_LICENSE("GPL");
  52 MODULE_VERSION("1.0");
  53 MODULE_ALIAS_MISCDEV(SUN_OPENPROM_MINOR);
  54
  55 /* Private data kept by the driver for each descriptor. */
  56 typedef struct openprom_private_data
  57 {
  58         struct device_node *current_node; /* Current node for SunOS ioctls. */
  59         struct device_node *lastnode; /* Last valid node used by BSD ioctls. */
  60 } DATA;
  61
  62 /* ID of the PROM node containing all of the EEPROM options. */
  63 static DEFINE_MUTEX(openprom_mutex);
  64 static struct device_node *options_node;
  65
  66 /*
  67  * Copy an openpromio structure into kernel space from user space.
  68  * This routine does error checking to make sure that all memory
  69  * accesses are within bounds. A pointer to the allocated openpromio
  70  * structure will be placed in "*opp_p". Return value is the length
  71  * of the user supplied buffer.
  72  */
  73 static int copyin(struct openpromio __user *info, struct openpromio **opp_p)
  74 {
  75         unsigned int bufsize;
  76
  77         if (!info || !opp_p)
  78                 return -EFAULT;
  79
  80         if (get_user(bufsize, &info->oprom_size))
  81                 return -EFAULT;
  82
  83         if (bufsize == 0)
  84                 return -EINVAL;
  85
  86         /* If the bufsize is too large, just limit it.
  87          * Fix from Jason Rappleye.
  88          */
  89         if (bufsize > OPROMMAXPARAM)
  90                 bufsize = OPROMMAXPARAM;
  91
  92         if (!(*opp_p = kzalloc(sizeof(int) + bufsize + 1, GFP_KERNEL)))
  93                 return -ENOMEM;
  94
  95         if (copy_from_user(&(*opp_p)->oprom_array,
  96                            &info->oprom_array, bufsize)) {
  97                 kfree(*opp_p);
  98                 return -EFAULT;
  99         }
 100         return bufsize;
 101 }
 102
 103 static int getstrings(struct openpromio __user *info, struct openpromio **opp_p)
 104 {
 105         int n, bufsize;
 106         char c;
 107
 108         if (!info || !opp_p)
 109                 return -EFAULT;
 110
 111         if (!(*opp_p = kzalloc(sizeof(int) + OPROMMAXPARAM + 1, GFP_KERNEL)))
 112                 return -ENOMEM;
 113
 114         (*opp_p)->oprom_size = 0;
 115
 116         n = bufsize = 0;
 117         while ((n < 2) && (bufsize < OPROMMAXPARAM)) {
 118                 if (get_user(c, &info->oprom_array[bufsize])) {
 119                         kfree(*opp_p);
 120                         return -EFAULT;
 121                 }
 122                 if (c == '\0')
 123                         n++;
 124                 (*opp_p)->oprom_array[bufsize++] = c;
 125         }
 126         if (!n) {
 127                 kfree(*opp_p);
 128                 return -EINVAL;
 129         }
 130         return bufsize;
 131 }
 132
 133 /*
 134  * Copy an openpromio structure in kernel space back to user space.
 135  */
 136 static int copyout(void __user *info, struct openpromio *opp, int len)
 137 {
 138         if (copy_to_user(info, opp, len))
 139                 return -EFAULT;
 140         return 0;
 141 }
 142
 143 static int opromgetprop(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize)
 144 {
 145         const void *pval;
 146         int len;
 147
 148         if (!dp ||
 149             !(pval = of_get_property(dp, op->oprom_array, &len)) ||
 150             len <= 0 || len > bufsize)
 151                 return copyout(argp, op, sizeof(int));
 152
 153         memcpy(op->oprom_array, pval, len);
 154         op->oprom_array[len] = '\0';
 155         op->oprom_size = len;
 156
 157         return copyout(argp, op, sizeof(int) + bufsize);
 158 }
 159
 160 static int opromnxtprop(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize)
 161 {
 162         struct property *prop;
 163         int len;
 164
 165         if (!dp)
 166                 return copyout(argp, op, sizeof(int));
 167         if (op->oprom_array[0] == '\0') {
 168                 prop = dp->properties;
 169                 if (!prop)
 170                         return copyout(argp, op, sizeof(int));
 171                 len = strlen(prop->name);
 172         } else {
 173                 prop = of_find_property(dp, op->oprom_array, NULL);
 174
 175                 if (!prop ||
 176                     !prop->next ||
 177                     (len = strlen(prop->next->name)) + 1 > bufsize)
 178                         return copyout(argp, op, sizeof(int));
 179
 180                 prop = prop->next;
 181         }
 182
 183         memcpy(op->oprom_array, prop->name, len);
 184         op->oprom_array[len] = '\0';
 185         op->oprom_size = ++len;
 186
 187         return copyout(argp, op, sizeof(int) + bufsize);
 188 }
 189
 190 static int opromsetopt(struct device_node *dp, struct openpromio *op, int bufsize)
 191 {
 192         char *buf = op->oprom_array + strlen(op->oprom_array) + 1;
 193         int len = op->oprom_array + bufsize - buf;
 194
 195         return of_set_property(options_node, op->oprom_array, buf, len);
 196 }
 197
 198 static int opromnext(void __user *argp, unsigned int cmd, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data)
 199 {
 200         phandle ph;
 201
 202         BUILD_BUG_ON(sizeof(phandle) != sizeof(int));
 203
 204         if (bufsize < sizeof(phandle))
 205                 return -EINVAL;
 206
 207         ph = *((int *) op->oprom_array);
 208         if (ph) {
 209                 dp = of_find_node_by_phandle(ph);
 210                 if (!dp)
 211                         return -EINVAL;
 212
 213                 switch (cmd) {
 214                 case OPROMNEXT:
 215                         dp = dp->sibling;
 216                         break;
 217
 218                 case OPROMCHILD:
 219                         dp = dp->child;
 220                         break;
 221
 222                 case OPROMSETCUR:
 223                 default:
 224                         break;
 225                 }
 226         } else {
 227                 /* Sibling of node zero is the root node.  */
 228                 if (cmd != OPROMNEXT)
 229                         return -EINVAL;
 230
 231                 dp = of_find_node_by_path("/");
 232         }
 233
 234         ph = 0;
 235         if (dp)
 236                 ph = dp->phandle;
 237
 238         data->current_node = dp;
 239         *((int *) op->oprom_array) = ph;
 240         op->oprom_size = sizeof(phandle);
 241
 242         return copyout(argp, op, bufsize + sizeof(int));
 243 }
 244
 245 static int oprompci2node(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data)
 246 {
 247         int err = -EINVAL;
 248
 249         if (bufsize >= 2*sizeof(int)) {
 250 #ifdef CONFIG_PCI
 251                 struct pci_dev *pdev;
 252                 struct device_node *dp;
 253
 254                 pdev = pci_get_domain_bus_and_slot(0,
 255                                                 ((int *) op->oprom_array)[0],
 256                                                 ((int *) op->oprom_array)[1]);
 257
 258                 dp = pci_device_to_OF_node(pdev);
 259                 data->current_node = dp;
 260                 *((int *)op->oprom_array) = dp->phandle;
 261                 op->oprom_size = sizeof(int);
 262                 err = copyout(argp, op, bufsize + sizeof(int));
 263
 264                 pci_dev_put(pdev);
 265 #endif
 266         }
 267
 268         return err;
 269 }
 270
 271 static int oprompath2node(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data)
 272 {
 273         phandle ph = 0;
 274
 275         dp = of_find_node_by_path(op->oprom_array);
 276         if (dp)
 277                 ph = dp->phandle;
 278         data->current_node = dp;
 279         *((int *)op->oprom_array) = ph;
 280         op->oprom_size = sizeof(int);
 281
 282         return copyout(argp, op, bufsize + sizeof(int));
 283 }
 284
 285 static int opromgetbootargs(void __user *argp, struct openpromio *op, int bufsize)
 286 {
 287         char *buf = saved_command_line;
 288         int len = strlen(buf);
 289
 290         if (len > bufsize)
 291                 return -EINVAL;
 292
 293         strcpy(op->oprom_array, buf);
 294         op->oprom_size = len;
 295
 296         return copyout(argp, op, bufsize + sizeof(int));
 297 }
 298
 299 /*
 300  *      SunOS and Solaris /dev/openprom ioctl calls.
 301  */
 302 static long openprom_sunos_ioctl(struct file * file,
 303                                  unsigned int cmd, unsigned long arg,
 304                                  struct device_node *dp)
 305 {
 306         DATA *data = file->private_data;
 307         struct openpromio *opp = NULL;
 308         int bufsize, error = 0;
 309         static int cnt;
 310         void __user *argp = (void __user *)arg;
 311
 312         if (cmd == OPROMSETOPT)
 313                 bufsize = getstrings(argp, &opp);
 314         else
 315                 bufsize = copyin(argp, &opp);
 316
 317         if (bufsize < 0)
 318                 return bufsize;
 319
 320         mutex_lock(&openprom_mutex);
 321
 322         switch (cmd) {
 323         case OPROMGETOPT:
 324         case OPROMGETPROP:
 325                 error = opromgetprop(argp, dp, opp, bufsize);
 326                 break;
 327
 328         case OPROMNXTOPT:
 329         case OPROMNXTPROP:
 330                 error = opromnxtprop(argp, dp, opp, bufsize);
 331                 break;
 332
 333         case OPROMSETOPT:
 334         case OPROMSETOPT2:
 335                 error = opromsetopt(dp, opp, bufsize);
 336                 break;
 337
 338         case OPROMNEXT:
 339         case OPROMCHILD:
 340         case OPROMSETCUR:
 341                 error = opromnext(argp, cmd, dp, opp, bufsize, data);
 342                 break;
 343
 344         case OPROMPCI2NODE:
 345                 error = oprompci2node(argp, dp, opp, bufsize, data);
 346                 break;
 347
 348         case OPROMPATH2NODE:
 349                 error = oprompath2node(argp, dp, opp, bufsize, data);
 350                 break;
 351
 352         case OPROMGETBOOTARGS:
 353                 error = opromgetbootargs(argp, opp, bufsize);
 354                 break;
 355
 356         case OPROMU2P:
 357         case OPROMGETCONS:
 358         case OPROMGETFBNAME:
 359                 if (cnt++ < 10)
 360                         printk(KERN_INFO "openprom_sunos_ioctl: unimplemented ioctl\n");
 361                 error = -EINVAL;
 362                 break;
 363         default:
 364                 if (cnt++ < 10)
 365                         printk(KERN_INFO "openprom_sunos_ioctl: cmd 0x%X, arg 0x%lX\n", cmd, arg);
 366                 error = -EINVAL;
 367                 break;
 368         }
 369
 370         kfree(opp);
 371         mutex_unlock(&openprom_mutex);
 372
 373         return error;
 374 }
 375
 376 static struct device_node *get_node(phandle n, DATA *data)
 377 {
 378         struct device_node *dp = of_find_node_by_phandle(n);
 379
 380         if (dp)
 381                 data->lastnode = dp;
 382
 383         return dp;
 384 }
 385
 386 /* Copy in a whole string from userspace into kernelspace. */
 387 static char * copyin_string(char __user *user, size_t len)
 388 {
 389         if ((ssize_t)len < 0 || (ssize_t)(len + 1) < 0)
 390                 return ERR_PTR(-EINVAL);
 391
 392         return memdup_user_nul(user, len);
 393 }
 394
 395 /*
 396  *      NetBSD /dev/openprom ioctl calls.
 397  */
 398 static int opiocget(void __user *argp, DATA *data)
 399 {
 400         struct opiocdesc op;
 401         struct device_node *dp;
 402         char *str;
 403         const void *pval;
 404         int err, len;
 405
 406         if (copy_from_user(&op, argp, sizeof(op)))
 407                 return -EFAULT;
 408
 409         dp = get_node(op.op_nodeid, data);
 410
 411         str = copyin_string(op.op_name, op.op_namelen);
 412         if (IS_ERR(str))
 413                 return PTR_ERR(str);
 414
 415         pval = of_get_property(dp, str, &len);
 416         err = 0;
 417         if (!pval || len > op.op_buflen) {
 418                 err = -EINVAL;
 419         } else {
 420                 op.op_buflen = len;
 421                 if (copy_to_user(argp, &op, sizeof(op)) ||
 422                     copy_to_user(op.op_buf, pval, len))
 423                         err = -EFAULT;
 424         }
 425         kfree(str);
 426
 427         return err;
 428 }
 429
 430 static int opiocnextprop(void __user *argp, DATA *data)
 431 {
 432         struct opiocdesc op;
 433         struct device_node *dp;
 434         struct property *prop;
 435         char *str;
 436         int len;
 437
 438         if (copy_from_user(&op, argp, sizeof(op)))
 439                 return -EFAULT;
 440
 441         dp = get_node(op.op_nodeid, data);
 442         if (!dp)
 443                 return -EINVAL;
 444
 445         str = copyin_string(op.op_name, op.op_namelen);
 446         if (IS_ERR(str))
 447                 return PTR_ERR(str);
 448
 449         if (str[0] == '\0') {
 450                 prop = dp->properties;
 451         } else {
 452                 prop = of_find_property(dp, str, NULL);
 453                 if (prop)
 454                         prop = prop->next;
 455         }
 456         kfree(str);
 457
 458         if (!prop)
 459                 len = 0;
 460         else
 461                 len = prop->length;
 462
 463         if (len > op.op_buflen)
 464                 len = op.op_buflen;
 465
 466         if (copy_to_user(argp, &op, sizeof(op)))
 467                 return -EFAULT;
 468
 469         if (len &&
 470             copy_to_user(op.op_buf, prop->value, len))
 471                 return -EFAULT;
 472
 473         return 0;
 474 }
 475
 476 static int opiocset(void __user *argp, DATA *data)
 477 {
 478         struct opiocdesc op;
 479         struct device_node *dp;
 480         char *str, *tmp;
 481         int err;
 482
 483         if (copy_from_user(&op, argp, sizeof(op)))
 484                 return -EFAULT;
 485
 486         dp = get_node(op.op_nodeid, data);
 487         if (!dp)
 488                 return -EINVAL;
 489
 490         str = copyin_string(op.op_name, op.op_namelen);
 491         if (IS_ERR(str))
 492                 return PTR_ERR(str);
 493
 494         tmp = copyin_string(op.op_buf, op.op_buflen);
 495         if (IS_ERR(tmp)) {
 496                 kfree(str);
 497                 return PTR_ERR(tmp);
 498         }
 499
 500         err = of_set_property(dp, str, tmp, op.op_buflen);
 501
 502         kfree(str);
 503         kfree(tmp);
 504
 505         return err;
 506 }
 507
 508 static int opiocgetnext(unsigned int cmd, void __user *argp)
 509 {
 510         struct device_node *dp;
 511         phandle nd;
 512
 513         BUILD_BUG_ON(sizeof(phandle) != sizeof(int));
 514
 515         if (copy_from_user(&nd, argp, sizeof(phandle)))
 516                 return -EFAULT;
 517
 518         if (nd == 0) {
 519                 if (cmd != OPIOCGETNEXT)
 520                         return -EINVAL;
 521                 dp = of_find_node_by_path("/");
 522         } else {
 523                 dp = of_find_node_by_phandle(nd);
 524                 nd = 0;
 525                 if (dp) {
 526                         if (cmd == OPIOCGETNEXT)
 527                                 dp = dp->sibling;
 528                         else
 529                                 dp = dp->child;
 530                 }
 531         }
 532         if (dp)
 533                 nd = dp->phandle;
 534         if (copy_to_user(argp, &nd, sizeof(phandle)))
 535                 return -EFAULT;
 536
 537         return 0;
 538 }
 539
 540 static int openprom_bsd_ioctl(struct file * file,
 541                               unsigned int cmd, unsigned long arg)
 542 {
 543         DATA *data = file->private_data;
 544         void __user *argp = (void __user *)arg;
 545         int err;
 546
 547         mutex_lock(&openprom_mutex);
 548         switch (cmd) {
 549         case OPIOCGET:
 550                 err = opiocget(argp, data);
 551                 break;
 552
 553         case OPIOCNEXTPROP:
 554                 err = opiocnextprop(argp, data);
 555                 break;
 556
 557         case OPIOCSET:
 558                 err = opiocset(argp, data);
 559                 break;
 560
 561         case OPIOCGETOPTNODE:
 562                 BUILD_BUG_ON(sizeof(phandle) != sizeof(int));
 563
 564                 err = 0;
 565                 if (copy_to_user(argp, &options_node->phandle, sizeof(phandle)))
 566                         err = -EFAULT;
 567                 break;
 568
 569         case OPIOCGETNEXT:
 570         case OPIOCGETCHILD:
 571                 err = opiocgetnext(cmd, argp);
 572                 break;
 573
 574         default:
 575                 err = -EINVAL;
 576                 break;
 577         }
 578         mutex_unlock(&openprom_mutex);
 579
 580         return err;
 581 }
 582
 583
 584 /*
 585  *      Handoff control to the correct ioctl handler.
 586  */
 587 static long openprom_ioctl(struct file * file,
 588                            unsigned int cmd, unsigned long arg)
 589 {
 590         DATA *data = file->private_data;
 591
 592         switch (cmd) {
 593         case OPROMGETOPT:
 594         case OPROMNXTOPT:
 595                 if ((file->f_mode & FMODE_READ) == 0)
 596                         return -EPERM;
 597                 return openprom_sunos_ioctl(file, cmd, arg,
 598                                             options_node);
 599
 600         case OPROMSETOPT:
 601         case OPROMSETOPT2:
 602                 if ((file->f_mode & FMODE_WRITE) == 0)
 603                         return -EPERM;
 604                 return openprom_sunos_ioctl(file, cmd, arg,
 605                                             options_node);
 606
 607         case OPROMNEXT:
 608         case OPROMCHILD:
 609         case OPROMGETPROP:
 610         case OPROMNXTPROP:
 611                 if ((file->f_mode & FMODE_READ) == 0)
 612                         return -EPERM;
 613                 return openprom_sunos_ioctl(file, cmd, arg,
 614                                             data->current_node);
 615
 616         case OPROMU2P:
 617         case OPROMGETCONS:
 618         case OPROMGETFBNAME:
 619         case OPROMGETBOOTARGS:
 620         case OPROMSETCUR:
 621         case OPROMPCI2NODE:
 622         case OPROMPATH2NODE:
 623                 if ((file->f_mode & FMODE_READ) == 0)
 624                         return -EPERM;
 625                 return openprom_sunos_ioctl(file, cmd, arg, NULL);
 626
 627         case OPIOCGET:
 628         case OPIOCNEXTPROP:
 629         case OPIOCGETOPTNODE:
 630         case OPIOCGETNEXT:
 631         case OPIOCGETCHILD:
 632                 if ((file->f_mode & FMODE_READ) == 0)
 633                         return -EBADF;
 634                 return openprom_bsd_ioctl(file,cmd,arg);
 635
 636         case OPIOCSET:
 637                 if ((file->f_mode & FMODE_WRITE) == 0)
 638                         return -EBADF;
 639                 return openprom_bsd_ioctl(file,cmd,arg);
 640
 641         default:
 642                 return -EINVAL;
 643         };
 644 }
 645
 646 static long openprom_compat_ioctl(struct file *file, unsigned int cmd,
 647                 unsigned long arg)
 648 {
 649         long rval = -ENOTTY;
 650
 651         /*
 652          * SunOS/Solaris only, the NetBSD one's have embedded pointers in
 653          * the arg which we'd need to clean up...
 654          */
 655         switch (cmd) {
 656         case OPROMGETOPT:
 657         case OPROMSETOPT:
 658         case OPROMNXTOPT:
 659         case OPROMSETOPT2:
 660         case OPROMNEXT:
 661         case OPROMCHILD:
 662         case OPROMGETPROP:
 663         case OPROMNXTPROP:
 664         case OPROMU2P:
 665         case OPROMGETCONS:
 666         case OPROMGETFBNAME:
 667         case OPROMGETBOOTARGS:
 668         case OPROMSETCUR:
 669         case OPROMPCI2NODE:
 670         case OPROMPATH2NODE:
 671                 rval = openprom_ioctl(file, cmd, arg);
 672                 break;
 673         }
 674
 675         return rval;
 676 }
 677
 678 static int openprom_open(struct inode * inode, struct file * file)
 679 {
 680         DATA *data;
 681
 682         data = kmalloc(sizeof(DATA), GFP_KERNEL);
 683         if (!data)
 684                 return -ENOMEM;
 685
 686         mutex_lock(&openprom_mutex);
 687         data->current_node = of_find_node_by_path("/");
 688         data->lastnode = data->current_node;
 689         file->private_data = (void *) data;
 690         mutex_unlock(&openprom_mutex);
 691
 692         return 0;
 693 }
 694
 695 static int openprom_release(struct inode * inode, struct file * file)
 696 {
 697         kfree(file->private_data);
 698         return 0;
 699 }
 700
 701 static const struct file_operations openprom_fops = {
 702         .owner =        THIS_MODULE,
 703         .llseek =       no_llseek,
 704         .unlocked_ioctl = openprom_ioctl,
 705         .compat_ioctl = openprom_compat_ioctl,
 706         .open =         openprom_open,
 707         .release =      openprom_release,
 708 };
 709
 710 static struct miscdevice openprom_dev = {
 711         .minor          = SUN_OPENPROM_MINOR,
 712         .name           = "openprom",
 713         .fops           = &openprom_fops,
 714 };
 715
 716 static int __init openprom_init(void)
 717 {
 718         struct device_node *dp;
 719         int err;
 720
 721         err = misc_register(&openprom_dev);
 722         if (err)
 723                 return err;
 724
 725         dp = of_find_node_by_path("/");
 726         dp = dp->child;
 727         while (dp) {
 728                 if (!strcmp(dp->name, "options"))
 729                         break;
 730                 dp = dp->sibling;
 731         }
 732         options_node = dp;
 733
 734         if (!options_node) {
 735                 misc_deregister(&openprom_dev);
 736                 return -EIO;
 737         }
 738
 739         return 0;
 740 }
 741
 742 static void __exit openprom_cleanup(void)
 743 {
 744         misc_deregister(&openprom_dev);
 745 }
 746
 747 module_init(openprom_init);
 748 module_exit(openprom_cleanup);