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/poll.h>
  27 #include <linux/mutex.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/smp_lock.h>
  30
  31 #include "tpm.h"
  32
  33 enum tpm_const {
  34         TPM_MINOR = 224,        /* officially assigned */
  35         TPM_BUFSIZE = 2048,
  36         TPM_NUM_DEVICES = 256,
  37 };
  38
  39 enum tpm_duration {
  40         TPM_SHORT = 0,
  41         TPM_MEDIUM = 1,
  42         TPM_LONG = 2,
  43         TPM_UNDEFINED,
  44 };
  45
  46 #define TPM_MAX_ORDINAL 243
  47 #define TPM_MAX_PROTECTED_ORDINAL 12
  48 #define TPM_PROTECTED_ORDINAL_MASK 0xFF
  49
  50 static LIST_HEAD(tpm_chip_list);
  51 static DEFINE_SPINLOCK(driver_lock);
  52 static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
  53
  54 /*
  55  * Array with one entry per ordinal defining the maximum amount
  56  * of time the chip could take to return the result.  The ordinal
  57  * designation of short, medium or long is defined in a table in
  58  * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
  59  * values of the SHORT, MEDIUM, and LONG durations are retrieved
  60  * from the chip during initialization with a call to tpm_get_timeouts.
  61  */
  62 static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
  63         TPM_UNDEFINED,          /* 0 */
  64         TPM_UNDEFINED,
  65         TPM_UNDEFINED,
  66         TPM_UNDEFINED,
  67         TPM_UNDEFINED,
  68         TPM_UNDEFINED,          /* 5 */
  69         TPM_UNDEFINED,
  70         TPM_UNDEFINED,
  71         TPM_UNDEFINED,
  72         TPM_UNDEFINED,
  73         TPM_SHORT,              /* 10 */
  74         TPM_SHORT,
  75 };
  76
  77 static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
  78         TPM_UNDEFINED,          /* 0 */
  79         TPM_UNDEFINED,
  80         TPM_UNDEFINED,
  81         TPM_UNDEFINED,
  82         TPM_UNDEFINED,
  83         TPM_UNDEFINED,          /* 5 */
  84         TPM_UNDEFINED,
  85         TPM_UNDEFINED,
  86         TPM_UNDEFINED,
  87         TPM_UNDEFINED,
  88         TPM_SHORT,              /* 10 */
  89         TPM_SHORT,
  90         TPM_MEDIUM,
  91         TPM_LONG,
  92         TPM_LONG,
  93         TPM_MEDIUM,             /* 15 */
  94         TPM_SHORT,
  95         TPM_SHORT,
  96         TPM_MEDIUM,
  97         TPM_LONG,
  98         TPM_SHORT,              /* 20 */
  99         TPM_SHORT,
 100         TPM_MEDIUM,
 101         TPM_MEDIUM,
 102         TPM_MEDIUM,
 103         TPM_SHORT,              /* 25 */
 104         TPM_SHORT,
 105         TPM_MEDIUM,
 106         TPM_SHORT,
 107         TPM_SHORT,
 108         TPM_MEDIUM,             /* 30 */
 109         TPM_LONG,
 110         TPM_MEDIUM,
 111         TPM_SHORT,
 112         TPM_SHORT,
 113         TPM_SHORT,              /* 35 */
 114         TPM_MEDIUM,
 115         TPM_MEDIUM,
 116         TPM_UNDEFINED,
 117         TPM_UNDEFINED,
 118         TPM_MEDIUM,             /* 40 */
 119         TPM_LONG,
 120         TPM_MEDIUM,
 121         TPM_SHORT,
 122         TPM_SHORT,
 123         TPM_SHORT,              /* 45 */
 124         TPM_SHORT,
 125         TPM_SHORT,
 126         TPM_SHORT,
 127         TPM_LONG,
 128         TPM_MEDIUM,             /* 50 */
 129         TPM_MEDIUM,
 130         TPM_UNDEFINED,
 131         TPM_UNDEFINED,
 132         TPM_UNDEFINED,
 133         TPM_UNDEFINED,          /* 55 */
 134         TPM_UNDEFINED,
 135         TPM_UNDEFINED,
 136         TPM_UNDEFINED,
 137         TPM_UNDEFINED,
 138         TPM_MEDIUM,             /* 60 */
 139         TPM_MEDIUM,
 140         TPM_MEDIUM,
 141         TPM_SHORT,
 142         TPM_SHORT,
 143         TPM_MEDIUM,             /* 65 */
 144         TPM_UNDEFINED,
 145         TPM_UNDEFINED,
 146         TPM_UNDEFINED,
 147         TPM_UNDEFINED,
 148         TPM_SHORT,              /* 70 */
 149         TPM_SHORT,
 150         TPM_UNDEFINED,
 151         TPM_UNDEFINED,
 152         TPM_UNDEFINED,
 153         TPM_UNDEFINED,          /* 75 */
 154         TPM_UNDEFINED,
 155         TPM_UNDEFINED,
 156         TPM_UNDEFINED,
 157         TPM_UNDEFINED,
 158         TPM_LONG,               /* 80 */
 159         TPM_UNDEFINED,
 160         TPM_MEDIUM,
 161         TPM_LONG,
 162         TPM_SHORT,
 163         TPM_UNDEFINED,          /* 85 */
 164         TPM_UNDEFINED,
 165         TPM_UNDEFINED,
 166         TPM_UNDEFINED,
 167         TPM_UNDEFINED,
 168         TPM_SHORT,              /* 90 */
 169         TPM_SHORT,
 170         TPM_SHORT,
 171         TPM_SHORT,
 172         TPM_SHORT,
 173         TPM_UNDEFINED,          /* 95 */
 174         TPM_UNDEFINED,
 175         TPM_UNDEFINED,
 176         TPM_UNDEFINED,
 177         TPM_UNDEFINED,
 178         TPM_MEDIUM,             /* 100 */
 179         TPM_SHORT,
 180         TPM_SHORT,
 181         TPM_UNDEFINED,
 182         TPM_UNDEFINED,
 183         TPM_UNDEFINED,          /* 105 */
 184         TPM_UNDEFINED,
 185         TPM_UNDEFINED,
 186         TPM_UNDEFINED,
 187         TPM_UNDEFINED,
 188         TPM_SHORT,              /* 110 */
 189         TPM_SHORT,
 190         TPM_SHORT,
 191         TPM_SHORT,
 192         TPM_SHORT,
 193         TPM_SHORT,              /* 115 */
 194         TPM_SHORT,
 195         TPM_SHORT,
 196         TPM_UNDEFINED,
 197         TPM_UNDEFINED,
 198         TPM_LONG,               /* 120 */
 199         TPM_LONG,
 200         TPM_MEDIUM,
 201         TPM_UNDEFINED,
 202         TPM_SHORT,
 203         TPM_SHORT,              /* 125 */
 204         TPM_SHORT,
 205         TPM_LONG,
 206         TPM_SHORT,
 207         TPM_SHORT,
 208         TPM_SHORT,              /* 130 */
 209         TPM_MEDIUM,
 210         TPM_UNDEFINED,
 211         TPM_SHORT,
 212         TPM_MEDIUM,
 213         TPM_UNDEFINED,          /* 135 */
 214         TPM_UNDEFINED,
 215         TPM_UNDEFINED,
 216         TPM_UNDEFINED,
 217         TPM_UNDEFINED,
 218         TPM_SHORT,              /* 140 */
 219         TPM_SHORT,
 220         TPM_UNDEFINED,
 221         TPM_UNDEFINED,
 222         TPM_UNDEFINED,
 223         TPM_UNDEFINED,          /* 145 */
 224         TPM_UNDEFINED,
 225         TPM_UNDEFINED,
 226         TPM_UNDEFINED,
 227         TPM_UNDEFINED,
 228         TPM_SHORT,              /* 150 */
 229         TPM_MEDIUM,
 230         TPM_MEDIUM,
 231         TPM_SHORT,
 232         TPM_SHORT,
 233         TPM_UNDEFINED,          /* 155 */
 234         TPM_UNDEFINED,
 235         TPM_UNDEFINED,
 236         TPM_UNDEFINED,
 237         TPM_UNDEFINED,
 238         TPM_SHORT,              /* 160 */
 239         TPM_SHORT,
 240         TPM_SHORT,
 241         TPM_SHORT,
 242         TPM_UNDEFINED,
 243         TPM_UNDEFINED,          /* 165 */
 244         TPM_UNDEFINED,
 245         TPM_UNDEFINED,
 246         TPM_UNDEFINED,
 247         TPM_UNDEFINED,
 248         TPM_LONG,               /* 170 */
 249         TPM_UNDEFINED,
 250         TPM_UNDEFINED,
 251         TPM_UNDEFINED,
 252         TPM_UNDEFINED,
 253         TPM_UNDEFINED,          /* 175 */
 254         TPM_UNDEFINED,
 255         TPM_UNDEFINED,
 256         TPM_UNDEFINED,
 257         TPM_UNDEFINED,
 258         TPM_MEDIUM,             /* 180 */
 259         TPM_SHORT,
 260         TPM_MEDIUM,
 261         TPM_MEDIUM,
 262         TPM_MEDIUM,
 263         TPM_MEDIUM,             /* 185 */
 264         TPM_SHORT,
 265         TPM_UNDEFINED,
 266         TPM_UNDEFINED,
 267         TPM_UNDEFINED,
 268         TPM_UNDEFINED,          /* 190 */
 269         TPM_UNDEFINED,
 270         TPM_UNDEFINED,
 271         TPM_UNDEFINED,
 272         TPM_UNDEFINED,
 273         TPM_UNDEFINED,          /* 195 */
 274         TPM_UNDEFINED,
 275         TPM_UNDEFINED,
 276         TPM_UNDEFINED,
 277         TPM_UNDEFINED,
 278         TPM_SHORT,              /* 200 */
 279         TPM_UNDEFINED,
 280         TPM_UNDEFINED,
 281         TPM_UNDEFINED,
 282         TPM_SHORT,
 283         TPM_SHORT,              /* 205 */
 284         TPM_SHORT,
 285         TPM_SHORT,
 286         TPM_SHORT,
 287         TPM_SHORT,
 288         TPM_MEDIUM,             /* 210 */
 289         TPM_UNDEFINED,
 290         TPM_MEDIUM,
 291         TPM_MEDIUM,
 292         TPM_MEDIUM,
 293         TPM_UNDEFINED,          /* 215 */
 294         TPM_MEDIUM,
 295         TPM_UNDEFINED,
 296         TPM_UNDEFINED,
 297         TPM_SHORT,
 298         TPM_SHORT,              /* 220 */
 299         TPM_SHORT,
 300         TPM_SHORT,
 301         TPM_SHORT,
 302         TPM_SHORT,
 303         TPM_UNDEFINED,          /* 225 */
 304         TPM_UNDEFINED,
 305         TPM_UNDEFINED,
 306         TPM_UNDEFINED,
 307         TPM_UNDEFINED,
 308         TPM_SHORT,              /* 230 */
 309         TPM_LONG,
 310         TPM_MEDIUM,
 311         TPM_UNDEFINED,
 312         TPM_UNDEFINED,
 313         TPM_UNDEFINED,          /* 235 */
 314         TPM_UNDEFINED,
 315         TPM_UNDEFINED,
 316         TPM_UNDEFINED,
 317         TPM_UNDEFINED,
 318         TPM_SHORT,              /* 240 */
 319         TPM_UNDEFINED,
 320         TPM_MEDIUM,
 321 };
 322
 323 static void user_reader_timeout(unsigned long ptr)
 324 {
 325         struct tpm_chip *chip = (struct tpm_chip *) ptr;
 326
 327         schedule_work(&chip->work);
 328 }
 329
 330 static void timeout_work(struct work_struct *work)
 331 {
 332         struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
 333
 334         mutex_lock(&chip->buffer_mutex);
 335         atomic_set(&chip->data_pending, 0);
 336         memset(chip->data_buffer, 0, TPM_BUFSIZE);
 337         mutex_unlock(&chip->buffer_mutex);
 338 }
 339
 340 /*
 341  * Returns max number of jiffies to wait
 342  */
 343 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
 344                                            u32 ordinal)
 345 {
 346         int duration_idx = TPM_UNDEFINED;
 347         int duration = 0;
 348
 349         if (ordinal < TPM_MAX_ORDINAL)
 350                 duration_idx = tpm_ordinal_duration[ordinal];
 351         else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
 352                  TPM_MAX_PROTECTED_ORDINAL)
 353                 duration_idx =
 354                     tpm_protected_ordinal_duration[ordinal &
 355                                                    TPM_PROTECTED_ORDINAL_MASK];
 356
 357         if (duration_idx != TPM_UNDEFINED)
 358                 duration = chip->vendor.duration[duration_idx];
 359         if (duration <= 0)
 360                 return 2 * 60 * HZ;
 361         else
 362                 return duration;
 363 }
 364 EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
 365
 366 /*
 367  * Internal kernel interface to transmit TPM commands
 368  */
 369 static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
 370                             size_t bufsiz)
 371 {
 372         ssize_t rc;
 373         u32 count, ordinal;
 374         unsigned long stop;
 375
 376         count = be32_to_cpu(*((__be32 *) (buf + 2)));
 377         ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
 378         if (count == 0)
 379                 return -ENODATA;
 380         if (count > bufsiz) {
 381                 dev_err(chip->dev,
 382                         "invalid count value %x %zx \n", count, bufsiz);
 383                 return -E2BIG;
 384         }
 385
 386         mutex_lock(&chip->tpm_mutex);
 387
 388         if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
 389                 dev_err(chip->dev,
 390                         "tpm_transmit: tpm_send: error %zd\n", rc);
 391                 goto out;
 392         }
 393
 394         if (chip->vendor.irq)
 395                 goto out_recv;
 396
 397         stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
 398         do {
 399                 u8 status = chip->vendor.status(chip);
 400                 if ((status & chip->vendor.req_complete_mask) ==
 401                     chip->vendor.req_complete_val)
 402                         goto out_recv;
 403
 404                 if ((status == chip->vendor.req_canceled)) {
 405                         dev_err(chip->dev, "Operation Canceled\n");
 406                         rc = -ECANCELED;
 407                         goto out;
 408                 }
 409
 410                 msleep(TPM_TIMEOUT);    /* CHECK */
 411                 rmb();
 412         } while (time_before(jiffies, stop));
 413
 414         chip->vendor.cancel(chip);
 415         dev_err(chip->dev, "Operation Timed out\n");
 416         rc = -ETIME;
 417         goto out;
 418
 419 out_recv:
 420         rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
 421         if (rc < 0)
 422                 dev_err(chip->dev,
 423                         "tpm_transmit: tpm_recv: error %zd\n", rc);
 424 out:
 425         mutex_unlock(&chip->tpm_mutex);
 426         return rc;
 427 }
 428
 429 #define TPM_DIGEST_SIZE 20
 430 #define TPM_ERROR_SIZE 10
 431 #define TPM_RET_CODE_IDX 6
 432 #define TPM_GET_CAP_RET_SIZE_IDX 10
 433 #define TPM_GET_CAP_RET_UINT32_1_IDX 14
 434 #define TPM_GET_CAP_RET_UINT32_2_IDX 18
 435 #define TPM_GET_CAP_RET_UINT32_3_IDX 22
 436 #define TPM_GET_CAP_RET_UINT32_4_IDX 26
 437 #define TPM_GET_CAP_PERM_DISABLE_IDX 16
 438 #define TPM_GET_CAP_PERM_INACTIVE_IDX 18
 439 #define TPM_GET_CAP_RET_BOOL_1_IDX 14
 440 #define TPM_GET_CAP_TEMP_INACTIVE_IDX 16
 441
 442 #define TPM_CAP_IDX 13
 443 #define TPM_CAP_SUBCAP_IDX 21
 444
 445 enum tpm_capabilities {
 446         TPM_CAP_FLAG = 4,
 447         TPM_CAP_PROP = 5,
 448 };
 449
 450 enum tpm_sub_capabilities {
 451         TPM_CAP_PROP_PCR = 0x1,
 452         TPM_CAP_PROP_MANUFACTURER = 0x3,
 453         TPM_CAP_FLAG_PERM = 0x8,
 454         TPM_CAP_FLAG_VOL = 0x9,
 455         TPM_CAP_PROP_OWNER = 0x11,
 456         TPM_CAP_PROP_TIS_TIMEOUT = 0x15,
 457         TPM_CAP_PROP_TIS_DURATION = 0x20,
 458 };
 459
 460 /*
 461  * This is a semi generic GetCapability command for use
 462  * with the capability type TPM_CAP_PROP or TPM_CAP_FLAG
 463  * and their associated sub_capabilities.
 464  */
 465
 466 static const u8 tpm_cap[] = {
 467         0, 193,                 /* TPM_TAG_RQU_COMMAND */
 468         0, 0, 0, 22,            /* length */
 469         0, 0, 0, 101,           /* TPM_ORD_GetCapability */
 470         0, 0, 0, 0,             /* TPM_CAP_<TYPE> */
 471         0, 0, 0, 4,             /* TPM_CAP_SUB_<TYPE> size */
 472         0, 0, 1, 0              /* TPM_CAP_SUB_<TYPE> */
 473 };
 474
 475 static ssize_t transmit_cmd(struct tpm_chip *chip, u8 *data, int len,
 476                             char *desc)
 477 {
 478         int err;
 479
 480         len = tpm_transmit(chip, data, len);
 481         if (len <  0)
 482                 return len;
 483         if (len == TPM_ERROR_SIZE) {
 484                 err = be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)));
 485                 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
 486                 return err;
 487         }
 488         return 0;
 489 }
 490
 491 void tpm_gen_interrupt(struct tpm_chip *chip)
 492 {
 493         u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
 494         ssize_t rc;
 495
 496         memcpy(data, tpm_cap, sizeof(tpm_cap));
 497         data[TPM_CAP_IDX] = TPM_CAP_PROP;
 498         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
 499
 500         rc = transmit_cmd(chip, data, sizeof(data),
 501                         "attempting to determine the timeouts");
 502 }
 503 EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
 504
 505 void tpm_get_timeouts(struct tpm_chip *chip)
 506 {
 507         u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
 508         ssize_t rc;
 509         u32 timeout;
 510
 511         memcpy(data, tpm_cap, sizeof(tpm_cap));
 512         data[TPM_CAP_IDX] = TPM_CAP_PROP;
 513         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
 514
 515         rc = transmit_cmd(chip, data, sizeof(data),
 516                         "attempting to determine the timeouts");
 517         if (rc)
 518                 goto duration;
 519
 520         if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
 521             != 4 * sizeof(u32))
 522                 goto duration;
 523
 524         /* Don't overwrite default if value is 0 */
 525         timeout =
 526             be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)));
 527         if (timeout)
 528                 chip->vendor.timeout_a = usecs_to_jiffies(timeout);
 529         timeout =
 530             be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX)));
 531         if (timeout)
 532                 chip->vendor.timeout_b = usecs_to_jiffies(timeout);
 533         timeout =
 534             be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX)));
 535         if (timeout)
 536                 chip->vendor.timeout_c = usecs_to_jiffies(timeout);
 537         timeout =
 538             be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_4_IDX)));
 539         if (timeout)
 540                 chip->vendor.timeout_d = usecs_to_jiffies(timeout);
 541
 542 duration:
 543         memcpy(data, tpm_cap, sizeof(tpm_cap));
 544         data[TPM_CAP_IDX] = TPM_CAP_PROP;
 545         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_DURATION;
 546
 547         rc = transmit_cmd(chip, data, sizeof(data),
 548                         "attempting to determine the durations");
 549         if (rc)
 550                 return;
 551
 552         if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
 553             != 3 * sizeof(u32))
 554                 return;
 555
 556         chip->vendor.duration[TPM_SHORT] =
 557             usecs_to_jiffies(be32_to_cpu
 558                              (*((__be32 *) (data +
 559                                             TPM_GET_CAP_RET_UINT32_1_IDX))));
 560         /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
 561          * value wrong and apparently reports msecs rather than usecs. So we
 562          * fix up the resulting too-small TPM_SHORT value to make things work.
 563          */
 564         if (chip->vendor.duration[TPM_SHORT] < (HZ/100))
 565                 chip->vendor.duration[TPM_SHORT] = HZ;
 566
 567         chip->vendor.duration[TPM_MEDIUM] =
 568             usecs_to_jiffies(be32_to_cpu
 569                              (*((__be32 *) (data +
 570                                             TPM_GET_CAP_RET_UINT32_2_IDX))));
 571         chip->vendor.duration[TPM_LONG] =
 572             usecs_to_jiffies(be32_to_cpu
 573                              (*((__be32 *) (data +
 574                                             TPM_GET_CAP_RET_UINT32_3_IDX))));
 575 }
 576 EXPORT_SYMBOL_GPL(tpm_get_timeouts);
 577
 578 void tpm_continue_selftest(struct tpm_chip *chip)
 579 {
 580         u8 data[] = {
 581                 0, 193,                 /* TPM_TAG_RQU_COMMAND */
 582                 0, 0, 0, 10,            /* length */
 583                 0, 0, 0, 83,            /* TPM_ORD_GetCapability */
 584         };
 585
 586         tpm_transmit(chip, data, sizeof(data));
 587 }
 588 EXPORT_SYMBOL_GPL(tpm_continue_selftest);
 589
 590 #define  TPM_INTERNAL_RESULT_SIZE 200
 591
 592 ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
 593                         char *buf)
 594 {
 595         u8 *data;
 596         ssize_t rc;
 597
 598         struct tpm_chip *chip = dev_get_drvdata(dev);
 599         if (chip == NULL)
 600                 return -ENODEV;
 601
 602         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
 603         if (!data)
 604                 return -ENOMEM;
 605
 606         memcpy(data, tpm_cap, sizeof(tpm_cap));
 607         data[TPM_CAP_IDX] = TPM_CAP_FLAG;
 608         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
 609
 610         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
 611                         "attemtping to determine the permanent enabled state");
 612         if (rc) {
 613                 kfree(data);
 614                 return 0;
 615         }
 616
 617         rc = sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_DISABLE_IDX]);
 618
 619         kfree(data);
 620         return rc;
 621 }
 622 EXPORT_SYMBOL_GPL(tpm_show_enabled);
 623
 624 ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
 625                         char *buf)
 626 {
 627         u8 *data;
 628         ssize_t rc;
 629
 630         struct tpm_chip *chip = dev_get_drvdata(dev);
 631         if (chip == NULL)
 632                 return -ENODEV;
 633
 634         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
 635         if (!data)
 636                 return -ENOMEM;
 637
 638         memcpy(data, tpm_cap, sizeof(tpm_cap));
 639         data[TPM_CAP_IDX] = TPM_CAP_FLAG;
 640         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
 641
 642         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
 643                         "attemtping to determine the permanent active state");
 644         if (rc) {
 645                 kfree(data);
 646                 return 0;
 647         }
 648
 649         rc = sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_INACTIVE_IDX]);
 650
 651         kfree(data);
 652         return rc;
 653 }
 654 EXPORT_SYMBOL_GPL(tpm_show_active);
 655
 656 ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
 657                         char *buf)
 658 {
 659         u8 *data;
 660         ssize_t rc;
 661
 662         struct tpm_chip *chip = dev_get_drvdata(dev);
 663         if (chip == NULL)
 664                 return -ENODEV;
 665
 666         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
 667         if (!data)
 668                 return -ENOMEM;
 669
 670         memcpy(data, tpm_cap, sizeof(tpm_cap));
 671         data[TPM_CAP_IDX] = TPM_CAP_PROP;
 672         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_OWNER;
 673
 674         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
 675                         "attempting to determine the owner state");
 676         if (rc) {
 677                 kfree(data);
 678                 return 0;
 679         }
 680
 681         rc = sprintf(buf, "%d\n", data[TPM_GET_CAP_RET_BOOL_1_IDX]);
 682
 683         kfree(data);
 684         return rc;
 685 }
 686 EXPORT_SYMBOL_GPL(tpm_show_owned);
 687
 688 ssize_t tpm_show_temp_deactivated(struct device * dev,
 689                                 struct device_attribute * attr, char *buf)
 690 {
 691         u8 *data;
 692         ssize_t rc;
 693
 694         struct tpm_chip *chip = dev_get_drvdata(dev);
 695         if (chip == NULL)
 696                 return -ENODEV;
 697
 698         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
 699         if (!data)
 700                 return -ENOMEM;
 701
 702         memcpy(data, tpm_cap, sizeof(tpm_cap));
 703         data[TPM_CAP_IDX] = TPM_CAP_FLAG;
 704         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_VOL;
 705
 706         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
 707                         "attempting to determine the temporary state");
 708         if (rc) {
 709                 kfree(data);
 710                 return 0;
 711         }
 712
 713         rc = sprintf(buf, "%d\n", data[TPM_GET_CAP_TEMP_INACTIVE_IDX]);
 714
 715         kfree(data);
 716         return rc;
 717 }
 718 EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
 719
 720 static const u8 pcrread[] = {
 721         0, 193,                 /* TPM_TAG_RQU_COMMAND */
 722         0, 0, 0, 14,            /* length */
 723         0, 0, 0, 21,            /* TPM_ORD_PcrRead */
 724         0, 0, 0, 0              /* PCR index */
 725 };
 726
 727 ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
 728                       char *buf)
 729 {
 730         u8 *data;
 731         ssize_t rc;
 732         int i, j, num_pcrs;
 733         __be32 index;
 734         char *str = buf;
 735
 736         struct tpm_chip *chip = dev_get_drvdata(dev);
 737         if (chip == NULL)
 738                 return -ENODEV;
 739
 740         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
 741         if (!data)
 742                 return -ENOMEM;
 743
 744         memcpy(data, tpm_cap, sizeof(tpm_cap));
 745         data[TPM_CAP_IDX] = TPM_CAP_PROP;
 746         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR;
 747
 748         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
 749                         "attempting to determine the number of PCRS");
 750         if (rc) {
 751                 kfree(data);
 752                 return 0;
 753         }
 754
 755         num_pcrs = be32_to_cpu(*((__be32 *) (data + 14)));
 756         for (i = 0; i < num_pcrs; i++) {
 757                 memcpy(data, pcrread, sizeof(pcrread));
 758                 index = cpu_to_be32(i);
 759                 memcpy(data + 10, &index, 4);
 760                 rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
 761                                 "attempting to read a PCR");
 762                 if (rc)
 763                         goto out;
 764                 str += sprintf(str, "PCR-%02d: ", i);
 765                 for (j = 0; j < TPM_DIGEST_SIZE; j++)
 766                         str += sprintf(str, "%02X ", *(data + 10 + j));
 767                 str += sprintf(str, "\n");
 768         }
 769 out:
 770         kfree(data);
 771         return str - buf;
 772 }
 773 EXPORT_SYMBOL_GPL(tpm_show_pcrs);
 774
 775 #define  READ_PUBEK_RESULT_SIZE 314
 776 static const u8 readpubek[] = {
 777         0, 193,                 /* TPM_TAG_RQU_COMMAND */
 778         0, 0, 0, 30,            /* length */
 779         0, 0, 0, 124,           /* TPM_ORD_ReadPubek */
 780 };
 781
 782 ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
 783                        char *buf)
 784 {
 785         u8 *data;
 786         ssize_t err;
 787         int i, rc;
 788         char *str = buf;
 789
 790         struct tpm_chip *chip = dev_get_drvdata(dev);
 791         if (chip == NULL)
 792                 return -ENODEV;
 793
 794         data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL);
 795         if (!data)
 796                 return -ENOMEM;
 797
 798         memcpy(data, readpubek, sizeof(readpubek));
 799
 800         err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE,
 801                         "attempting to read the PUBEK");
 802         if (err)
 803                 goto out;
 804
 805         /*
 806            ignore header 10 bytes
 807            algorithm 32 bits (1 == RSA )
 808            encscheme 16 bits
 809            sigscheme 16 bits
 810            parameters (RSA 12->bytes: keybit, #primes, expbit)
 811            keylenbytes 32 bits
 812            256 byte modulus
 813            ignore checksum 20 bytes
 814          */
 815
 816         str +=
 817             sprintf(str,
 818                     "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
 819                     "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
 820                     " %02X %02X %02X %02X %02X %02X %02X %02X\n"
 821                     "Modulus length: %d\nModulus: \n",
 822                     data[10], data[11], data[12], data[13], data[14],
 823                     data[15], data[16], data[17], data[22], data[23],
 824                     data[24], data[25], data[26], data[27], data[28],
 825                     data[29], data[30], data[31], data[32], data[33],
 826                     be32_to_cpu(*((__be32 *) (data + 34))));
 827
 828         for (i = 0; i < 256; i++) {
 829                 str += sprintf(str, "%02X ", data[i + 38]);
 830                 if ((i + 1) % 16 == 0)
 831                         str += sprintf(str, "\n");
 832         }
 833 out:
 834         rc = str - buf;
 835         kfree(data);
 836         return rc;
 837 }
 838 EXPORT_SYMBOL_GPL(tpm_show_pubek);
 839
 840 #define CAP_VERSION_1_1 6
 841 #define CAP_VERSION_1_2 0x1A
 842 #define CAP_VERSION_IDX 13
 843 static const u8 cap_version[] = {
 844         0, 193,                 /* TPM_TAG_RQU_COMMAND */
 845         0, 0, 0, 18,            /* length */
 846         0, 0, 0, 101,           /* TPM_ORD_GetCapability */
 847         0, 0, 0, 0,
 848         0, 0, 0, 0
 849 };
 850
 851 ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
 852                       char *buf)
 853 {
 854         u8 *data;
 855         ssize_t rc;
 856         char *str = buf;
 857
 858         struct tpm_chip *chip = dev_get_drvdata(dev);
 859         if (chip == NULL)
 860                 return -ENODEV;
 861
 862         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
 863         if (!data)
 864                 return -ENOMEM;
 865
 866         memcpy(data, tpm_cap, sizeof(tpm_cap));
 867         data[TPM_CAP_IDX] = TPM_CAP_PROP;
 868         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
 869
 870         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
 871                         "attempting to determine the manufacturer");
 872         if (rc) {
 873                 kfree(data);
 874                 return 0;
 875         }
 876
 877         str += sprintf(str, "Manufacturer: 0x%x\n",
 878                        be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
 879
 880         memcpy(data, cap_version, sizeof(cap_version));
 881         data[CAP_VERSION_IDX] = CAP_VERSION_1_1;
 882         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
 883                         "attempting to determine the 1.1 version");
 884         if (rc)
 885                 goto out;
 886
 887         str += sprintf(str,
 888                        "TCG version: %d.%d\nFirmware version: %d.%d\n",
 889                        (int) data[14], (int) data[15], (int) data[16],
 890                        (int) data[17]);
 891
 892 out:
 893         kfree(data);
 894         return str - buf;
 895 }
 896 EXPORT_SYMBOL_GPL(tpm_show_caps);
 897
 898 ssize_t tpm_show_caps_1_2(struct device * dev,
 899                           struct device_attribute * attr, char *buf)
 900 {
 901         u8 *data;
 902         ssize_t len;
 903         char *str = buf;
 904
 905         struct tpm_chip *chip = dev_get_drvdata(dev);
 906         if (chip == NULL)
 907                 return -ENODEV;
 908
 909         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
 910         if (!data)
 911                 return -ENOMEM;
 912
 913         memcpy(data, tpm_cap, sizeof(tpm_cap));
 914         data[TPM_CAP_IDX] = TPM_CAP_PROP;
 915         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
 916
 917         len = tpm_transmit(chip, data, TPM_INTERNAL_RESULT_SIZE);
 918         if (len <= TPM_ERROR_SIZE) {
 919                 dev_dbg(chip->dev, "A TPM error (%d) occurred "
 920                         "attempting to determine the manufacturer\n",
 921                         be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
 922                 kfree(data);
 923                 return 0;
 924         }
 925
 926         str += sprintf(str, "Manufacturer: 0x%x\n",
 927                        be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
 928
 929         memcpy(data, cap_version, sizeof(cap_version));
 930         data[CAP_VERSION_IDX] = CAP_VERSION_1_2;
 931
 932         len = tpm_transmit(chip, data, TPM_INTERNAL_RESULT_SIZE);
 933         if (len <= TPM_ERROR_SIZE) {
 934                 dev_err(chip->dev, "A TPM error (%d) occurred "
 935                         "attempting to determine the 1.2 version\n",
 936                         be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
 937                 goto out;
 938         }
 939         str += sprintf(str,
 940                        "TCG version: %d.%d\nFirmware version: %d.%d\n",
 941                        (int) data[16], (int) data[17], (int) data[18],
 942                        (int) data[19]);
 943
 944 out:
 945         kfree(data);
 946         return str - buf;
 947 }
 948 EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
 949
 950 ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
 951                         const char *buf, size_t count)
 952 {
 953         struct tpm_chip *chip = dev_get_drvdata(dev);
 954         if (chip == NULL)
 955                 return 0;
 956
 957         chip->vendor.cancel(chip);
 958         return count;
 959 }
 960 EXPORT_SYMBOL_GPL(tpm_store_cancel);
 961
 962 /*
 963  * Device file system interface to the TPM
 964  *
 965  * It's assured that the chip will be opened just once,
 966  * by the check of is_open variable, which is protected
 967  * by driver_lock.
 968  */
 969 int tpm_open(struct inode *inode, struct file *file)
 970 {
 971         int minor = iminor(inode);
 972         struct tpm_chip *chip = NULL, *pos;
 973
 974         rcu_read_lock();
 975         list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
 976                 if (pos->vendor.miscdev.minor == minor) {
 977                         chip = pos;
 978                         get_device(chip->dev);
 979                         break;
 980                 }
 981         }
 982         rcu_read_unlock();
 983
 984         if (!chip)
 985                 return -ENODEV;
 986
 987         if (test_and_set_bit(0, &chip->is_open)) {
 988                 dev_dbg(chip->dev, "Another process owns this TPM\n");
 989                 put_device(chip->dev);
 990                 return -EBUSY;
 991         }
 992
 993         chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
 994         if (chip->data_buffer == NULL) {
 995                 clear_bit(0, &chip->is_open);
 996                 put_device(chip->dev);
 997                 return -ENOMEM;
 998         }
 999
1000         atomic_set(&chip->data_pending, 0);
1001
1002         file->private_data = chip;
1003         return 0;
1004 }
1005 EXPORT_SYMBOL_GPL(tpm_open);
1006
1007 /*
1008  * Called on file close
1009  */
1010 int tpm_release(struct inode *inode, struct file *file)
1011 {
1012         struct tpm_chip *chip = file->private_data;
1013
1014         del_singleshot_timer_sync(&chip->user_read_timer);
1015         flush_scheduled_work();
1016         file->private_data = NULL;
1017         atomic_set(&chip->data_pending, 0);
1018         kfree(chip->data_buffer);
1019         clear_bit(0, &chip->is_open);
1020         put_device(chip->dev);
1021         return 0;
1022 }
1023 EXPORT_SYMBOL_GPL(tpm_release);
1024
1025 ssize_t tpm_write(struct file *file, const char __user *buf,
1026                   size_t size, loff_t *off)
1027 {
1028         struct tpm_chip *chip = file->private_data;
1029         size_t in_size = size, out_size;
1030
1031         /* cannot perform a write until the read has cleared
1032            either via tpm_read or a user_read_timer timeout */
1033         while (atomic_read(&chip->data_pending) != 0)
1034                 msleep(TPM_TIMEOUT);
1035
1036         mutex_lock(&chip->buffer_mutex);
1037
1038         if (in_size > TPM_BUFSIZE)
1039                 in_size = TPM_BUFSIZE;
1040
1041         if (copy_from_user
1042             (chip->data_buffer, (void __user *) buf, in_size)) {
1043                 mutex_unlock(&chip->buffer_mutex);
1044                 return -EFAULT;
1045         }
1046
1047         /* atomic tpm command send and result receive */
1048         out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1049
1050         atomic_set(&chip->data_pending, out_size);
1051         mutex_unlock(&chip->buffer_mutex);
1052
1053         /* Set a timeout by which the reader must come claim the result */
1054         mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1055
1056         return in_size;
1057 }
1058 EXPORT_SYMBOL_GPL(tpm_write);
1059
1060 ssize_t tpm_read(struct file *file, char __user *buf,
1061                  size_t size, loff_t *off)
1062 {
1063         struct tpm_chip *chip = file->private_data;
1064         ssize_t ret_size;
1065
1066         del_singleshot_timer_sync(&chip->user_read_timer);
1067         flush_scheduled_work();
1068         ret_size = atomic_read(&chip->data_pending);
1069         atomic_set(&chip->data_pending, 0);
1070         if (ret_size > 0) {     /* relay data */
1071                 if (size < ret_size)
1072                         ret_size = size;
1073
1074                 mutex_lock(&chip->buffer_mutex);
1075                 if (copy_to_user(buf, chip->data_buffer, ret_size))
1076                         ret_size = -EFAULT;
1077                 mutex_unlock(&chip->buffer_mutex);
1078         }
1079
1080         return ret_size;
1081 }
1082 EXPORT_SYMBOL_GPL(tpm_read);
1083
1084 void tpm_remove_hardware(struct device *dev)
1085 {
1086         struct tpm_chip *chip = dev_get_drvdata(dev);
1087
1088         if (chip == NULL) {
1089                 dev_err(dev, "No device data found\n");
1090                 return;
1091         }
1092
1093         spin_lock(&driver_lock);
1094         list_del_rcu(&chip->list);
1095         spin_unlock(&driver_lock);
1096         synchronize_rcu();
1097
1098         misc_deregister(&chip->vendor.miscdev);
1099         sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
1100         tpm_bios_log_teardown(chip->bios_dir);
1101
1102         /* write it this way to be explicit (chip->dev == dev) */
1103         put_device(chip->dev);
1104 }
1105 EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1106
1107 /*
1108  * We are about to suspend. Save the TPM state
1109  * so that it can be restored.
1110  */
1111 int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1112 {
1113         struct tpm_chip *chip = dev_get_drvdata(dev);
1114         u8 savestate[] = {
1115                 0, 193,         /* TPM_TAG_RQU_COMMAND */
1116                 0, 0, 0, 10,    /* blob length (in bytes) */
1117                 0, 0, 0, 152    /* TPM_ORD_SaveState */
1118         };
1119
1120         if (chip == NULL)
1121                 return -ENODEV;
1122
1123         tpm_transmit(chip, savestate, sizeof(savestate));
1124         return 0;
1125 }
1126 EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1127
1128 /*
1129  * Resume from a power safe. The BIOS already restored
1130  * the TPM state.
1131  */
1132 int tpm_pm_resume(struct device *dev)
1133 {
1134         struct tpm_chip *chip = dev_get_drvdata(dev);
1135
1136         if (chip == NULL)
1137                 return -ENODEV;
1138
1139         return 0;
1140 }
1141 EXPORT_SYMBOL_GPL(tpm_pm_resume);
1142
1143 /* In case vendor provided release function, call it too.*/
1144
1145 void tpm_dev_vendor_release(struct tpm_chip *chip)
1146 {
1147         if (chip->vendor.release)
1148                 chip->vendor.release(chip->dev);
1149
1150         clear_bit(chip->dev_num, dev_mask);
1151         kfree(chip->vendor.miscdev.name);
1152 }
1153 EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1154
1155
1156 /*
1157  * Once all references to platform device are down to 0,
1158  * release all allocated structures.
1159  */
1160 void tpm_dev_release(struct device *dev)
1161 {
1162         struct tpm_chip *chip = dev_get_drvdata(dev);
1163
1164         tpm_dev_vendor_release(chip);
1165
1166         chip->release(dev);
1167         kfree(chip);
1168 }
1169 EXPORT_SYMBOL_GPL(tpm_dev_release);
1170
1171 /*
1172  * Called from tpm_<specific>.c probe function only for devices
1173  * the driver has determined it should claim.  Prior to calling
1174  * this function the specific probe function has called pci_enable_device
1175  * upon errant exit from this function specific probe function should call
1176  * pci_disable_device
1177  */
1178 struct tpm_chip *tpm_register_hardware(struct device *dev,
1179                                         const struct tpm_vendor_specific *entry)
1180 {
1181 #define DEVNAME_SIZE 7
1182
1183         char *devname;
1184         struct tpm_chip *chip;
1185
1186         /* Driver specific per-device data */
1187         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1188         devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1189
1190         if (chip == NULL || devname == NULL)
1191                 goto out_free;
1192
1193         mutex_init(&chip->buffer_mutex);
1194         mutex_init(&chip->tpm_mutex);
1195         INIT_LIST_HEAD(&chip->list);
1196
1197         INIT_WORK(&chip->work, timeout_work);
1198
1199         setup_timer(&chip->user_read_timer, user_reader_timeout,
1200                         (unsigned long)chip);
1201
1202         memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1203
1204         chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1205
1206         if (chip->dev_num >= TPM_NUM_DEVICES) {
1207                 dev_err(dev, "No available tpm device numbers\n");
1208                 goto out_free;
1209         } else if (chip->dev_num == 0)
1210                 chip->vendor.miscdev.minor = TPM_MINOR;
1211         else
1212                 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1213
1214         set_bit(chip->dev_num, dev_mask);
1215
1216         scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
1217         chip->vendor.miscdev.name = devname;
1218
1219         chip->vendor.miscdev.parent = dev;
1220         chip->dev = get_device(dev);
1221         chip->release = dev->release;
1222         dev->release = tpm_dev_release;
1223         dev_set_drvdata(dev, chip);
1224
1225         if (misc_register(&chip->vendor.miscdev)) {
1226                 dev_err(chip->dev,
1227                         "unable to misc_register %s, minor %d\n",
1228                         chip->vendor.miscdev.name,
1229                         chip->vendor.miscdev.minor);
1230                 put_device(chip->dev);
1231                 return NULL;
1232         }
1233
1234         if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
1235                 misc_deregister(&chip->vendor.miscdev);
1236                 put_device(chip->dev);
1237
1238                 return NULL;
1239         }
1240
1241         chip->bios_dir = tpm_bios_log_setup(devname);
1242
1243         /* Make chip available */
1244         spin_lock(&driver_lock);
1245         list_add_rcu(&chip->list, &tpm_chip_list);
1246         spin_unlock(&driver_lock);
1247
1248         return chip;
1249
1250 out_free:
1251         kfree(chip);
1252         kfree(devname);
1253         return NULL;
1254 }
1255 EXPORT_SYMBOL_GPL(tpm_register_hardware);
1256
1257 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1258 MODULE_DESCRIPTION("TPM Driver");
1259 MODULE_VERSION("2.0");
1260 MODULE_LICENSE("GPL");