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