drivers/char/tpm/tpm.c

   1 /*
   2  * Copyright (C) 2004 IBM Corporation
   3  *
   4  * Authors:
   5  * Leendert van Doorn <leendert@watson.ibm.com>
   6  * Dave Safford <safford@watson.ibm.com>
   7  * Reiner Sailer <sailer@watson.ibm.com>
   8  * Kylene Hall <kjhall@us.ibm.com>
   9  *
  10  * Maintained by: <tpmdd_devel@lists.sourceforge.net>
  11  *
  12  * Device driver for TCG/TCPA TPM (trusted platform module).
  13  * Specifications at www.trustedcomputinggroup.org
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License as
  17  * published by the Free Software Foundation, version 2 of the
  18  * License.
  19  *
  20  * Note, the TPM chip is not interrupt driven (only polling)
  21  * and can have very long timeouts (minutes!). Hence the unusual
  22  * calls to schedule_timeout.
  23  *
  24  */
  25
  26 #include <linux/sched.h>
  27 #include <linux/poll.h>
  28 #include <linux/spinlock.h>
  29 #include "tpm.h"
  30
  31 #define TPM_MINOR                       224     /* officially assigned */
  32
  33 #define TPM_BUFSIZE                     2048
  34
  35 /* PCI configuration addresses */
  36 #define PCI_GEN_PMCON_1                 0xA0
  37 #define PCI_GEN1_DEC                    0xE4
  38 #define PCI_LPC_EN                      0xE6
  39 #define PCI_GEN2_DEC                    0xEC
  40
  41 static LIST_HEAD(tpm_chip_list);
  42 static DEFINE_SPINLOCK(driver_lock);
  43 static int dev_mask[32];
  44
  45 static void user_reader_timeout(unsigned long ptr)
  46 {
  47         struct tpm_chip *chip = (struct tpm_chip *) ptr;
  48
  49         down(&chip->buffer_mutex);
  50         atomic_set(&chip->data_pending, 0);
  51         memset(chip->data_buffer, 0, TPM_BUFSIZE);
  52         up(&chip->buffer_mutex);
  53 }
  54
  55 void tpm_time_expired(unsigned long ptr)
  56 {
  57         int *exp = (int *) ptr;
  58         *exp = 1;
  59 }
  60
  61 EXPORT_SYMBOL_GPL(tpm_time_expired);
  62
  63 /*
  64  * Initialize the LPC bus and enable the TPM ports
  65  */
  66 int tpm_lpc_bus_init(struct pci_dev *pci_dev, u16 base)
  67 {
  68         u32 lpcenable, tmp;
  69         int is_lpcm = 0;
  70
  71         switch (pci_dev->vendor) {
  72         case PCI_VENDOR_ID_INTEL:
  73                 switch (pci_dev->device) {
  74                 case PCI_DEVICE_ID_INTEL_82801CA_12:
  75                 case PCI_DEVICE_ID_INTEL_82801DB_12:
  76                         is_lpcm = 1;
  77                         break;
  78                 }
  79                 /* init ICH (enable LPC) */
  80                 pci_read_config_dword(pci_dev, PCI_GEN1_DEC, &lpcenable);
  81                 lpcenable |= 0x20000000;
  82                 pci_write_config_dword(pci_dev, PCI_GEN1_DEC, lpcenable);
  83
  84                 if (is_lpcm) {
  85                         pci_read_config_dword(pci_dev, PCI_GEN1_DEC,
  86                                               &lpcenable);
  87                         if ((lpcenable & 0x20000000) == 0) {
  88                                 dev_err(&pci_dev->dev,
  89                                         "cannot enable LPC\n");
  90                                 return -ENODEV;
  91                         }
  92                 }
  93
  94                 /* initialize TPM registers */
  95                 pci_read_config_dword(pci_dev, PCI_GEN2_DEC, &tmp);
  96
  97                 if (!is_lpcm)
  98                         tmp = (tmp & 0xFFFF0000) | (base & 0xFFF0);
  99                 else
 100                         tmp =
 101                             (tmp & 0xFFFF0000) | (base & 0xFFF0) |
 102                             0x00000001;
 103
 104                 pci_write_config_dword(pci_dev, PCI_GEN2_DEC, tmp);
 105
 106                 if (is_lpcm) {
 107                         pci_read_config_dword(pci_dev, PCI_GEN_PMCON_1,
 108                                               &tmp);
 109                         tmp |= 0x00000004;      /* enable CLKRUN */
 110                         pci_write_config_dword(pci_dev, PCI_GEN_PMCON_1,
 111                                                tmp);
 112                 }
 113                 tpm_write_index(0x0D, 0x55);    /* unlock 4F */
 114                 tpm_write_index(0x0A, 0x00);    /* int disable */
 115                 tpm_write_index(0x08, base);    /* base addr lo */
 116                 tpm_write_index(0x09, (base & 0xFF00) >> 8);    /* base addr hi */
 117                 tpm_write_index(0x0D, 0xAA);    /* lock 4F */
 118                 break;
 119         case PCI_VENDOR_ID_AMD:
 120                 /* nothing yet */
 121                 break;
 122         }
 123
 124         return 0;
 125 }
 126
 127 EXPORT_SYMBOL_GPL(tpm_lpc_bus_init);
 128
 129 /*
 130  * Internal kernel interface to transmit TPM commands
 131  */
 132 static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
 133                             size_t bufsiz)
 134 {
 135         ssize_t len;
 136         u32 count;
 137         __be32 *native_size;
 138
 139         native_size = (__force __be32 *) (buf + 2);
 140         count = be32_to_cpu(*native_size);
 141
 142         if (count == 0)
 143                 return -ENODATA;
 144         if (count > bufsiz) {
 145                 dev_err(&chip->pci_dev->dev,
 146                         "invalid count value %x %x \n", count, bufsiz);
 147                 return -E2BIG;
 148         }
 149
 150         down(&chip->tpm_mutex);
 151
 152         if ((len = chip->vendor->send(chip, (u8 *) buf, count)) < 0) {
 153                 dev_err(&chip->pci_dev->dev,
 154                         "tpm_transmit: tpm_send: error %d\n", len);
 155                 return len;
 156         }
 157
 158         down(&chip->timer_manipulation_mutex);
 159         chip->time_expired = 0;
 160         init_timer(&chip->device_timer);
 161         chip->device_timer.function = tpm_time_expired;
 162         chip->device_timer.expires = jiffies + 2 * 60 * HZ;
 163         chip->device_timer.data = (unsigned long) &chip->time_expired;
 164         add_timer(&chip->device_timer);
 165         up(&chip->timer_manipulation_mutex);
 166
 167         do {
 168                 u8 status = inb(chip->vendor->base + 1);
 169                 if ((status & chip->vendor->req_complete_mask) ==
 170                     chip->vendor->req_complete_val) {
 171                         down(&chip->timer_manipulation_mutex);
 172                         del_singleshot_timer_sync(&chip->device_timer);
 173                         up(&chip->timer_manipulation_mutex);
 174                         goto out_recv;
 175                 }
 176                 set_current_state(TASK_UNINTERRUPTIBLE);
 177                 schedule_timeout(TPM_TIMEOUT);
 178                 rmb();
 179         } while (!chip->time_expired);
 180
 181
 182         chip->vendor->cancel(chip);
 183         dev_err(&chip->pci_dev->dev, "Time expired\n");
 184         up(&chip->tpm_mutex);
 185         return -EIO;
 186
 187 out_recv:
 188         len = chip->vendor->recv(chip, (u8 *) buf, bufsiz);
 189         if (len < 0)
 190                 dev_err(&chip->pci_dev->dev,
 191                         "tpm_transmit: tpm_recv: error %d\n", len);
 192         up(&chip->tpm_mutex);
 193         return len;
 194 }
 195
 196 #define TPM_DIGEST_SIZE 20
 197 #define CAP_PCR_RESULT_SIZE 18
 198 static u8 cap_pcr[] = {
 199         0, 193,                 /* TPM_TAG_RQU_COMMAND */
 200         0, 0, 0, 22,            /* length */
 201         0, 0, 0, 101,           /* TPM_ORD_GetCapability */
 202         0, 0, 0, 5,
 203         0, 0, 0, 4,
 204         0, 0, 1, 1
 205 };
 206
 207 #define READ_PCR_RESULT_SIZE 30
 208 static u8 pcrread[] = {
 209         0, 193,                 /* TPM_TAG_RQU_COMMAND */
 210         0, 0, 0, 14,            /* length */
 211         0, 0, 0, 21,            /* TPM_ORD_PcrRead */
 212         0, 0, 0, 0              /* PCR index */
 213 };
 214
 215 static ssize_t show_pcrs(struct device *dev, char *buf)
 216 {
 217         u8 data[READ_PCR_RESULT_SIZE];
 218         ssize_t len;
 219         int i, j, index, num_pcrs;
 220         char *str = buf;
 221
 222         struct tpm_chip *chip =
 223             pci_get_drvdata(container_of(dev, struct pci_dev, dev));
 224         if (chip == NULL)
 225                 return -ENODEV;
 226
 227         memcpy(data, cap_pcr, sizeof(cap_pcr));
 228         if ((len = tpm_transmit(chip, data, sizeof(data)))
 229             < CAP_PCR_RESULT_SIZE)
 230                 return len;
 231
 232         num_pcrs = be32_to_cpu(*((__force __be32 *) (data + 14)));
 233
 234         for (i = 0; i < num_pcrs; i++) {
 235                 memcpy(data, pcrread, sizeof(pcrread));
 236                 index = cpu_to_be32(i);
 237                 memcpy(data + 10, &index, 4);
 238                 if ((len = tpm_transmit(chip, data, sizeof(data)))
 239                     < READ_PCR_RESULT_SIZE)
 240                         return len;
 241                 str += sprintf(str, "PCR-%02d: ", i);
 242                 for (j = 0; j < TPM_DIGEST_SIZE; j++)
 243                         str += sprintf(str, "%02X ", *(data + 10 + j));
 244                 str += sprintf(str, "\n");
 245         }
 246         return str - buf;
 247 }
 248
 249 static DEVICE_ATTR(pcrs, S_IRUGO, show_pcrs, NULL);
 250
 251 #define  READ_PUBEK_RESULT_SIZE 314
 252 static u8 readpubek[] = {
 253         0, 193,                 /* TPM_TAG_RQU_COMMAND */
 254         0, 0, 0, 30,            /* length */
 255         0, 0, 0, 124,           /* TPM_ORD_ReadPubek */
 256 };
 257
 258 static ssize_t show_pubek(struct device *dev, char *buf)
 259 {
 260         u8 data[READ_PUBEK_RESULT_SIZE];
 261         ssize_t len;
 262         __be32 *native_val;
 263         int i;
 264         char *str = buf;
 265
 266         struct tpm_chip *chip =
 267             pci_get_drvdata(container_of(dev, struct pci_dev, dev));
 268         if (chip == NULL)
 269                 return -ENODEV;
 270
 271         memcpy(data, readpubek, sizeof(readpubek));
 272         memset(data + sizeof(readpubek), 0, 20);        /* zero nonce */
 273
 274         if ((len = tpm_transmit(chip, data, sizeof(data))) <
 275             READ_PUBEK_RESULT_SIZE)
 276                 return len;
 277
 278         /*
 279            ignore header 10 bytes
 280            algorithm 32 bits (1 == RSA )
 281            encscheme 16 bits
 282            sigscheme 16 bits
 283            parameters (RSA 12->bytes: keybit, #primes, expbit)
 284            keylenbytes 32 bits
 285            256 byte modulus
 286            ignore checksum 20 bytes
 287          */
 288
 289         native_val = (__force __be32 *) (data + 34);
 290
 291         str +=
 292             sprintf(str,
 293                     "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
 294                     "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
 295                     " %02X %02X %02X %02X %02X %02X %02X %02X\n"
 296                     "Modulus length: %d\nModulus: \n",
 297                     data[10], data[11], data[12], data[13], data[14],
 298                     data[15], data[16], data[17], data[22], data[23],
 299                     data[24], data[25], data[26], data[27], data[28],
 300                     data[29], data[30], data[31], data[32], data[33],
 301                     be32_to_cpu(*native_val)
 302             );
 303
 304         for (i = 0; i < 256; i++) {
 305                 str += sprintf(str, "%02X ", data[i + 39]);
 306                 if ((i + 1) % 16 == 0)
 307                         str += sprintf(str, "\n");
 308         }
 309         return str - buf;
 310 }
 311
 312 static DEVICE_ATTR(pubek, S_IRUGO, show_pubek, NULL);
 313
 314 #define CAP_VER_RESULT_SIZE 18
 315 static u8 cap_version[] = {
 316         0, 193,                 /* TPM_TAG_RQU_COMMAND */
 317         0, 0, 0, 18,            /* length */
 318         0, 0, 0, 101,           /* TPM_ORD_GetCapability */
 319         0, 0, 0, 6,
 320         0, 0, 0, 0
 321 };
 322
 323 #define CAP_MANUFACTURER_RESULT_SIZE 18
 324 static u8 cap_manufacturer[] = {
 325         0, 193,                 /* TPM_TAG_RQU_COMMAND */
 326         0, 0, 0, 22,            /* length */
 327         0, 0, 0, 101,           /* TPM_ORD_GetCapability */
 328         0, 0, 0, 5,
 329         0, 0, 0, 4,
 330         0, 0, 1, 3
 331 };
 332
 333 static ssize_t show_caps(struct device *dev, char *buf)
 334 {
 335         u8 data[READ_PUBEK_RESULT_SIZE];
 336         ssize_t len;
 337         char *str = buf;
 338
 339         struct tpm_chip *chip =
 340             pci_get_drvdata(container_of(dev, struct pci_dev, dev));
 341         if (chip == NULL)
 342                 return -ENODEV;
 343
 344         memcpy(data, cap_manufacturer, sizeof(cap_manufacturer));
 345
 346         if ((len = tpm_transmit(chip, data, sizeof(data))) <
 347             CAP_MANUFACTURER_RESULT_SIZE)
 348                 return len;
 349
 350         str += sprintf(str, "Manufacturer: 0x%x\n",
 351                        be32_to_cpu(*(data + 14)));
 352
 353         memcpy(data, cap_version, sizeof(cap_version));
 354
 355         if ((len = tpm_transmit(chip, data, sizeof(data))) <
 356             CAP_VER_RESULT_SIZE)
 357                 return len;
 358
 359         str +=
 360             sprintf(str, "TCG version: %d.%d\nFirmware version: %d.%d\n",
 361                     (int) data[14], (int) data[15], (int) data[16],
 362                     (int) data[17]);
 363
 364         return str - buf;
 365 }
 366
 367 static DEVICE_ATTR(caps, S_IRUGO, show_caps, NULL);
 368
 369 /*
 370  * Device file system interface to the TPM
 371  */
 372 int tpm_open(struct inode *inode, struct file *file)
 373 {
 374         int rc = 0, minor = iminor(inode);
 375         struct tpm_chip *chip = NULL, *pos;
 376
 377         spin_lock(&driver_lock);
 378
 379         list_for_each_entry(pos, &tpm_chip_list, list) {
 380                 if (pos->vendor->miscdev.minor == minor) {
 381                         chip = pos;
 382                         break;
 383                 }
 384         }
 385
 386         if (chip == NULL) {
 387                 rc = -ENODEV;
 388                 goto err_out;
 389         }
 390
 391         if (chip->num_opens) {
 392                 dev_dbg(&chip->pci_dev->dev,
 393                         "Another process owns this TPM\n");
 394                 rc = -EBUSY;
 395                 goto err_out;
 396         }
 397
 398         chip->num_opens++;
 399         pci_dev_get(chip->pci_dev);
 400
 401         spin_unlock(&driver_lock);
 402
 403         chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
 404         if (chip->data_buffer == NULL) {
 405                 chip->num_opens--;
 406                 pci_dev_put(chip->pci_dev);
 407                 return -ENOMEM;
 408         }
 409
 410         atomic_set(&chip->data_pending, 0);
 411
 412         file->private_data = chip;
 413         return 0;
 414
 415 err_out:
 416         spin_unlock(&driver_lock);
 417         return rc;
 418 }
 419
 420 EXPORT_SYMBOL_GPL(tpm_open);
 421
 422 int tpm_release(struct inode *inode, struct file *file)
 423 {
 424         struct tpm_chip *chip = file->private_data;
 425
 426         file->private_data = NULL;
 427
 428         spin_lock(&driver_lock);
 429         chip->num_opens--;
 430         spin_unlock(&driver_lock);
 431
 432         down(&chip->timer_manipulation_mutex);
 433         if (timer_pending(&chip->user_read_timer))
 434                 del_singleshot_timer_sync(&chip->user_read_timer);
 435         else if (timer_pending(&chip->device_timer))
 436                 del_singleshot_timer_sync(&chip->device_timer);
 437         up(&chip->timer_manipulation_mutex);
 438
 439         kfree(chip->data_buffer);
 440         atomic_set(&chip->data_pending, 0);
 441
 442         pci_dev_put(chip->pci_dev);
 443         return 0;
 444 }
 445
 446 EXPORT_SYMBOL_GPL(tpm_release);
 447
 448 ssize_t tpm_write(struct file * file, const char __user * buf,
 449                   size_t size, loff_t * off)
 450 {
 451         struct tpm_chip *chip = file->private_data;
 452         int in_size = size, out_size;
 453
 454         /* cannot perform a write until the read has cleared
 455            either via tpm_read or a user_read_timer timeout */
 456         while (atomic_read(&chip->data_pending) != 0) {
 457                 set_current_state(TASK_UNINTERRUPTIBLE);
 458                 schedule_timeout(TPM_TIMEOUT);
 459         }
 460
 461         down(&chip->buffer_mutex);
 462
 463         if (in_size > TPM_BUFSIZE)
 464                 in_size = TPM_BUFSIZE;
 465
 466         if (copy_from_user
 467             (chip->data_buffer, (void __user *) buf, in_size)) {
 468                 up(&chip->buffer_mutex);
 469                 return -EFAULT;
 470         }
 471
 472         /* atomic tpm command send and result receive */
 473         out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
 474
 475         atomic_set(&chip->data_pending, out_size);
 476         up(&chip->buffer_mutex);
 477
 478         /* Set a timeout by which the reader must come claim the result */
 479         down(&chip->timer_manipulation_mutex);
 480         init_timer(&chip->user_read_timer);
 481         chip->user_read_timer.function = user_reader_timeout;
 482         chip->user_read_timer.data = (unsigned long) chip;
 483         chip->user_read_timer.expires = jiffies + (60 * HZ);
 484         add_timer(&chip->user_read_timer);
 485         up(&chip->timer_manipulation_mutex);
 486
 487         return in_size;
 488 }
 489
 490 EXPORT_SYMBOL_GPL(tpm_write);
 491
 492 ssize_t tpm_read(struct file * file, char __user * buf,
 493                  size_t size, loff_t * off)
 494 {
 495         struct tpm_chip *chip = file->private_data;
 496         int ret_size = -ENODATA;
 497
 498         if (atomic_read(&chip->data_pending) != 0) {    /* Result available */
 499                 down(&chip->timer_manipulation_mutex);
 500                 del_singleshot_timer_sync(&chip->user_read_timer);
 501                 up(&chip->timer_manipulation_mutex);
 502
 503                 down(&chip->buffer_mutex);
 504
 505                 ret_size = atomic_read(&chip->data_pending);
 506                 atomic_set(&chip->data_pending, 0);
 507
 508                 if (ret_size == 0)      /* timeout just occurred */
 509                         ret_size = -ETIME;
 510                 else if (ret_size > 0) {        /* relay data */
 511                         if (size < ret_size)
 512                                 ret_size = size;
 513
 514                         if (copy_to_user((void __user *) buf,
 515                                          chip->data_buffer, ret_size)) {
 516                                 ret_size = -EFAULT;
 517                         }
 518                 }
 519                 up(&chip->buffer_mutex);
 520         }
 521
 522         return ret_size;
 523 }
 524
 525 EXPORT_SYMBOL_GPL(tpm_read);
 526
 527 void __devexit tpm_remove(struct pci_dev *pci_dev)
 528 {
 529         struct tpm_chip *chip = pci_get_drvdata(pci_dev);
 530
 531         if (chip == NULL) {
 532                 dev_err(&pci_dev->dev, "No device data found\n");
 533                 return;
 534         }
 535
 536         spin_lock(&driver_lock);
 537
 538         list_del(&chip->list);
 539
 540         spin_unlock(&driver_lock);
 541
 542         pci_set_drvdata(pci_dev, NULL);
 543         misc_deregister(&chip->vendor->miscdev);
 544
 545         device_remove_file(&pci_dev->dev, &dev_attr_pubek);
 546         device_remove_file(&pci_dev->dev, &dev_attr_pcrs);
 547         device_remove_file(&pci_dev->dev, &dev_attr_caps);
 548
 549         pci_disable_device(pci_dev);
 550
 551         dev_mask[chip->dev_num / 32] &= !(1 << (chip->dev_num % 32));
 552
 553         kfree(chip);
 554
 555         pci_dev_put(pci_dev);
 556 }
 557
 558 EXPORT_SYMBOL_GPL(tpm_remove);
 559
 560 static u8 savestate[] = {
 561         0, 193,                 /* TPM_TAG_RQU_COMMAND */
 562         0, 0, 0, 10,            /* blob length (in bytes) */
 563         0, 0, 0, 152            /* TPM_ORD_SaveState */
 564 };
 565
 566 /*
 567  * We are about to suspend. Save the TPM state
 568  * so that it can be restored.
 569  */
 570 int tpm_pm_suspend(struct pci_dev *pci_dev, u32 pm_state)
 571 {
 572         struct tpm_chip *chip = pci_get_drvdata(pci_dev);
 573         if (chip == NULL)
 574                 return -ENODEV;
 575
 576         tpm_transmit(chip, savestate, sizeof(savestate));
 577         return 0;
 578 }
 579
 580 EXPORT_SYMBOL_GPL(tpm_pm_suspend);
 581
 582 /*
 583  * Resume from a power safe. The BIOS already restored
 584  * the TPM state.
 585  */
 586 int tpm_pm_resume(struct pci_dev *pci_dev)
 587 {
 588         struct tpm_chip *chip = pci_get_drvdata(pci_dev);
 589
 590         if (chip == NULL)
 591                 return -ENODEV;
 592
 593         spin_lock(&driver_lock);
 594         tpm_lpc_bus_init(pci_dev, chip->vendor->base);
 595         spin_unlock(&driver_lock);
 596
 597         return 0;
 598 }
 599
 600 EXPORT_SYMBOL_GPL(tpm_pm_resume);
 601
 602 /*
 603  * Called from tpm_<specific>.c probe function only for devices
 604  * the driver has determined it should claim.  Prior to calling
 605  * this function the specific probe function has called pci_enable_device
 606  * upon errant exit from this function specific probe function should call
 607  * pci_disable_device
 608  */
 609 int tpm_register_hardware(struct pci_dev *pci_dev,
 610                           struct tpm_vendor_specific *entry)
 611 {
 612         char devname[7];
 613         struct tpm_chip *chip;
 614         int i, j;
 615
 616         /* Driver specific per-device data */
 617         chip = kmalloc(sizeof(*chip), GFP_KERNEL);
 618         if (chip == NULL)
 619                 return -ENOMEM;
 620
 621         memset(chip, 0, sizeof(struct tpm_chip));
 622
 623         init_MUTEX(&chip->buffer_mutex);
 624         init_MUTEX(&chip->tpm_mutex);
 625         init_MUTEX(&chip->timer_manipulation_mutex);
 626         INIT_LIST_HEAD(&chip->list);
 627
 628         chip->vendor = entry;
 629
 630         chip->dev_num = -1;
 631
 632         for (i = 0; i < 32; i++)
 633                 for (j = 0; j < 8; j++)
 634                         if ((dev_mask[i] & (1 << j)) == 0) {
 635                                 chip->dev_num = i * 32 + j;
 636                                 dev_mask[i] |= 1 << j;
 637                                 goto dev_num_search_complete;
 638                         }
 639
 640 dev_num_search_complete:
 641         if (chip->dev_num < 0) {
 642                 dev_err(&pci_dev->dev,
 643                         "No available tpm device numbers\n");
 644                 kfree(chip);
 645                 return -ENODEV;
 646         } else if (chip->dev_num == 0)
 647                 chip->vendor->miscdev.minor = TPM_MINOR;
 648         else
 649                 chip->vendor->miscdev.minor = MISC_DYNAMIC_MINOR;
 650
 651         snprintf(devname, sizeof(devname), "%s%d", "tpm", chip->dev_num);
 652         chip->vendor->miscdev.name = devname;
 653
 654         chip->vendor->miscdev.dev = &(pci_dev->dev);
 655         chip->pci_dev = pci_dev_get(pci_dev);
 656
 657         if (misc_register(&chip->vendor->miscdev)) {
 658                 dev_err(&chip->pci_dev->dev,
 659                         "unable to misc_register %s, minor %d\n",
 660                         chip->vendor->miscdev.name,
 661                         chip->vendor->miscdev.minor);
 662                 pci_dev_put(pci_dev);
 663                 kfree(chip);
 664                 dev_mask[i] &= !(1 << j);
 665                 return -ENODEV;
 666         }
 667
 668         pci_set_drvdata(pci_dev, chip);
 669
 670         list_add(&chip->list, &tpm_chip_list);
 671
 672         device_create_file(&pci_dev->dev, &dev_attr_pubek);
 673         device_create_file(&pci_dev->dev, &dev_attr_pcrs);
 674         device_create_file(&pci_dev->dev, &dev_attr_caps);
 675
 676         return 0;
 677 }
 678
 679 EXPORT_SYMBOL_GPL(tpm_register_hardware);
 680
 681 static int __init init_tpm(void)
 682 {
 683         return 0;
 684 }
 685
 686 static void __exit cleanup_tpm(void)
 687 {
 688
 689 }
 690
 691 module_init(init_tpm);
 692 module_exit(cleanup_tpm);
 693
 694 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
 695 MODULE_DESCRIPTION("TPM Driver");
 696 MODULE_VERSION("2.0");
 697 MODULE_LICENSE("GPL");