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