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
  30 #include "tpm.h"
  31
  32 enum tpm_const {
  33         TPM_MINOR = 224,        /* officially assigned */
  34         TPM_BUFSIZE = 2048,
  35         TPM_NUM_DEVICES = 256,
  36 };
  37
  38 enum tpm_duration {
  39         TPM_SHORT = 0,
  40         TPM_MEDIUM = 1,
  41         TPM_LONG = 2,
  42         TPM_UNDEFINED,
  43 };
  44
  45 #define TPM_MAX_ORDINAL 243
  46 #define TPM_MAX_PROTECTED_ORDINAL 12
  47 #define TPM_PROTECTED_ORDINAL_MASK 0xFF
  48
  49 static LIST_HEAD(tpm_chip_list);
  50 static DEFINE_SPINLOCK(driver_lock);
  51 static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
  52
  53 /*
  54  * Array with one entry per ordinal defining the maximum amount
  55  * of time the chip could take to return the result.  The ordinal
  56  * designation of short, medium or long is defined in a table in
  57  * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
  58  * values of the SHORT, MEDIUM, and LONG durations are retrieved
  59  * from the chip during initialization with a call to tpm_get_timeouts.
  60  */
  61 static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
  62         TPM_UNDEFINED,          /* 0 */
  63         TPM_UNDEFINED,
  64         TPM_UNDEFINED,
  65         TPM_UNDEFINED,
  66         TPM_UNDEFINED,
  67         TPM_UNDEFINED,          /* 5 */
  68         TPM_UNDEFINED,
  69         TPM_UNDEFINED,
  70         TPM_UNDEFINED,
  71         TPM_UNDEFINED,
  72         TPM_SHORT,              /* 10 */
  73         TPM_SHORT,
  74 };
  75
  76 static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
  77         TPM_UNDEFINED,          /* 0 */
  78         TPM_UNDEFINED,
  79         TPM_UNDEFINED,
  80         TPM_UNDEFINED,
  81         TPM_UNDEFINED,
  82         TPM_UNDEFINED,          /* 5 */
  83         TPM_UNDEFINED,
  84         TPM_UNDEFINED,
  85         TPM_UNDEFINED,
  86         TPM_UNDEFINED,
  87         TPM_SHORT,              /* 10 */
  88         TPM_SHORT,
  89         TPM_MEDIUM,
  90         TPM_LONG,
  91         TPM_LONG,
  92         TPM_MEDIUM,             /* 15 */
  93         TPM_SHORT,
  94         TPM_SHORT,
  95         TPM_MEDIUM,
  96         TPM_LONG,
  97         TPM_SHORT,              /* 20 */
  98         TPM_SHORT,
  99         TPM_MEDIUM,
 100         TPM_MEDIUM,
 101         TPM_MEDIUM,
 102         TPM_SHORT,              /* 25 */
 103         TPM_SHORT,
 104         TPM_MEDIUM,
 105         TPM_SHORT,
 106         TPM_SHORT,
 107         TPM_MEDIUM,             /* 30 */
 108         TPM_LONG,
 109         TPM_MEDIUM,
 110         TPM_SHORT,
 111         TPM_SHORT,
 112         TPM_SHORT,              /* 35 */
 113         TPM_MEDIUM,
 114         TPM_MEDIUM,
 115         TPM_UNDEFINED,
 116         TPM_UNDEFINED,
 117         TPM_MEDIUM,             /* 40 */
 118         TPM_LONG,
 119         TPM_MEDIUM,
 120         TPM_SHORT,
 121         TPM_SHORT,
 122         TPM_SHORT,              /* 45 */
 123         TPM_SHORT,
 124         TPM_SHORT,
 125         TPM_SHORT,
 126         TPM_LONG,
 127         TPM_MEDIUM,             /* 50 */
 128         TPM_MEDIUM,
 129         TPM_UNDEFINED,
 130         TPM_UNDEFINED,
 131         TPM_UNDEFINED,
 132         TPM_UNDEFINED,          /* 55 */
 133         TPM_UNDEFINED,
 134         TPM_UNDEFINED,
 135         TPM_UNDEFINED,
 136         TPM_UNDEFINED,
 137         TPM_MEDIUM,             /* 60 */
 138         TPM_MEDIUM,
 139         TPM_MEDIUM,
 140         TPM_SHORT,
 141         TPM_SHORT,
 142         TPM_MEDIUM,             /* 65 */
 143         TPM_UNDEFINED,
 144         TPM_UNDEFINED,
 145         TPM_UNDEFINED,
 146         TPM_UNDEFINED,
 147         TPM_SHORT,              /* 70 */
 148         TPM_SHORT,
 149         TPM_UNDEFINED,
 150         TPM_UNDEFINED,
 151         TPM_UNDEFINED,
 152         TPM_UNDEFINED,          /* 75 */
 153         TPM_UNDEFINED,
 154         TPM_UNDEFINED,
 155         TPM_UNDEFINED,
 156         TPM_UNDEFINED,
 157         TPM_LONG,               /* 80 */
 158         TPM_UNDEFINED,
 159         TPM_MEDIUM,
 160         TPM_LONG,
 161         TPM_SHORT,
 162         TPM_UNDEFINED,          /* 85 */
 163         TPM_UNDEFINED,
 164         TPM_UNDEFINED,
 165         TPM_UNDEFINED,
 166         TPM_UNDEFINED,
 167         TPM_SHORT,              /* 90 */
 168         TPM_SHORT,
 169         TPM_SHORT,
 170         TPM_SHORT,
 171         TPM_SHORT,
 172         TPM_UNDEFINED,          /* 95 */
 173         TPM_UNDEFINED,
 174         TPM_UNDEFINED,
 175         TPM_UNDEFINED,
 176         TPM_UNDEFINED,
 177         TPM_MEDIUM,             /* 100 */
 178         TPM_SHORT,
 179         TPM_SHORT,
 180         TPM_UNDEFINED,
 181         TPM_UNDEFINED,
 182         TPM_UNDEFINED,          /* 105 */
 183         TPM_UNDEFINED,
 184         TPM_UNDEFINED,
 185         TPM_UNDEFINED,
 186         TPM_UNDEFINED,
 187         TPM_SHORT,              /* 110 */
 188         TPM_SHORT,
 189         TPM_SHORT,
 190         TPM_SHORT,
 191         TPM_SHORT,
 192         TPM_SHORT,              /* 115 */
 193         TPM_SHORT,
 194         TPM_SHORT,
 195         TPM_UNDEFINED,
 196         TPM_UNDEFINED,
 197         TPM_LONG,               /* 120 */
 198         TPM_LONG,
 199         TPM_MEDIUM,
 200         TPM_UNDEFINED,
 201         TPM_SHORT,
 202         TPM_SHORT,              /* 125 */
 203         TPM_SHORT,
 204         TPM_LONG,
 205         TPM_SHORT,
 206         TPM_SHORT,
 207         TPM_SHORT,              /* 130 */
 208         TPM_MEDIUM,
 209         TPM_UNDEFINED,
 210         TPM_SHORT,
 211         TPM_MEDIUM,
 212         TPM_UNDEFINED,          /* 135 */
 213         TPM_UNDEFINED,
 214         TPM_UNDEFINED,
 215         TPM_UNDEFINED,
 216         TPM_UNDEFINED,
 217         TPM_SHORT,              /* 140 */
 218         TPM_SHORT,
 219         TPM_UNDEFINED,
 220         TPM_UNDEFINED,
 221         TPM_UNDEFINED,
 222         TPM_UNDEFINED,          /* 145 */
 223         TPM_UNDEFINED,
 224         TPM_UNDEFINED,
 225         TPM_UNDEFINED,
 226         TPM_UNDEFINED,
 227         TPM_SHORT,              /* 150 */
 228         TPM_MEDIUM,
 229         TPM_MEDIUM,
 230         TPM_SHORT,
 231         TPM_SHORT,
 232         TPM_UNDEFINED,          /* 155 */
 233         TPM_UNDEFINED,
 234         TPM_UNDEFINED,
 235         TPM_UNDEFINED,
 236         TPM_UNDEFINED,
 237         TPM_SHORT,              /* 160 */
 238         TPM_SHORT,
 239         TPM_SHORT,
 240         TPM_SHORT,
 241         TPM_UNDEFINED,
 242         TPM_UNDEFINED,          /* 165 */
 243         TPM_UNDEFINED,
 244         TPM_UNDEFINED,
 245         TPM_UNDEFINED,
 246         TPM_UNDEFINED,
 247         TPM_LONG,               /* 170 */
 248         TPM_UNDEFINED,
 249         TPM_UNDEFINED,
 250         TPM_UNDEFINED,
 251         TPM_UNDEFINED,
 252         TPM_UNDEFINED,          /* 175 */
 253         TPM_UNDEFINED,
 254         TPM_UNDEFINED,
 255         TPM_UNDEFINED,
 256         TPM_UNDEFINED,
 257         TPM_MEDIUM,             /* 180 */
 258         TPM_SHORT,
 259         TPM_MEDIUM,
 260         TPM_MEDIUM,
 261         TPM_MEDIUM,
 262         TPM_MEDIUM,             /* 185 */
 263         TPM_SHORT,
 264         TPM_UNDEFINED,
 265         TPM_UNDEFINED,
 266         TPM_UNDEFINED,
 267         TPM_UNDEFINED,          /* 190 */
 268         TPM_UNDEFINED,
 269         TPM_UNDEFINED,
 270         TPM_UNDEFINED,
 271         TPM_UNDEFINED,
 272         TPM_UNDEFINED,          /* 195 */
 273         TPM_UNDEFINED,
 274         TPM_UNDEFINED,
 275         TPM_UNDEFINED,
 276         TPM_UNDEFINED,
 277         TPM_SHORT,              /* 200 */
 278         TPM_UNDEFINED,
 279         TPM_UNDEFINED,
 280         TPM_UNDEFINED,
 281         TPM_SHORT,
 282         TPM_SHORT,              /* 205 */
 283         TPM_SHORT,
 284         TPM_SHORT,
 285         TPM_SHORT,
 286         TPM_SHORT,
 287         TPM_MEDIUM,             /* 210 */
 288         TPM_UNDEFINED,
 289         TPM_MEDIUM,
 290         TPM_MEDIUM,
 291         TPM_MEDIUM,
 292         TPM_UNDEFINED,          /* 215 */
 293         TPM_MEDIUM,
 294         TPM_UNDEFINED,
 295         TPM_UNDEFINED,
 296         TPM_SHORT,
 297         TPM_SHORT,              /* 220 */
 298         TPM_SHORT,
 299         TPM_SHORT,
 300         TPM_SHORT,
 301         TPM_SHORT,
 302         TPM_UNDEFINED,          /* 225 */
 303         TPM_UNDEFINED,
 304         TPM_UNDEFINED,
 305         TPM_UNDEFINED,
 306         TPM_UNDEFINED,
 307         TPM_SHORT,              /* 230 */
 308         TPM_LONG,
 309         TPM_MEDIUM,
 310         TPM_UNDEFINED,
 311         TPM_UNDEFINED,
 312         TPM_UNDEFINED,          /* 235 */
 313         TPM_UNDEFINED,
 314         TPM_UNDEFINED,
 315         TPM_UNDEFINED,
 316         TPM_UNDEFINED,
 317         TPM_SHORT,              /* 240 */
 318         TPM_UNDEFINED,
 319         TPM_MEDIUM,
 320 };
 321
 322 static void user_reader_timeout(unsigned long ptr)
 323 {
 324         struct tpm_chip *chip = (struct tpm_chip *) ptr;
 325
 326         schedule_work(&chip->work);
 327 }
 328
 329 static void timeout_work(struct work_struct *work)
 330 {
 331         struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
 332
 333         mutex_lock(&chip->buffer_mutex);
 334         atomic_set(&chip->data_pending, 0);
 335         memset(chip->data_buffer, 0, TPM_BUFSIZE);
 336         mutex_unlock(&chip->buffer_mutex);
 337 }
 338
 339 /*
 340  * Returns max number of jiffies to wait
 341  */
 342 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
 343                                            u32 ordinal)
 344 {
 345         int duration_idx = TPM_UNDEFINED;
 346         int duration = 0;
 347
 348         if (ordinal < TPM_MAX_ORDINAL)
 349                 duration_idx = tpm_ordinal_duration[ordinal];
 350         else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
 351                  TPM_MAX_PROTECTED_ORDINAL)
 352                 duration_idx =
 353                     tpm_protected_ordinal_duration[ordinal &
 354                                                    TPM_PROTECTED_ORDINAL_MASK];
 355
 356         if (duration_idx != TPM_UNDEFINED) {
 357                 duration = chip->vendor.duration[duration_idx];
 358                 /* if duration is 0, it's because chip->vendor.duration wasn't */
 359                 /* filled yet, so we set the lowest timeout just to give enough */
 360                 /* time for tpm_get_timeouts() to succeed */
 361                 return (duration <= 0 ? HZ : duration);
 362         } else
 363                 return 2 * 60 * HZ;
 364 }
 365 EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
 366
 367 /*
 368  * Internal kernel interface to transmit TPM commands
 369  */
 370 static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
 371                             size_t bufsiz)
 372 {
 373         ssize_t rc;
 374         u32 count, ordinal;
 375         unsigned long stop;
 376
 377         count = be32_to_cpu(*((__be32 *) (buf + 2)));
 378         ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
 379         if (count == 0)
 380                 return -ENODATA;
 381         if (count > bufsiz) {
 382                 dev_err(chip->dev,
 383                         "invalid count value %x %zx \n", count, bufsiz);
 384                 return -E2BIG;
 385         }
 386
 387         mutex_lock(&chip->tpm_mutex);
 388
 389         if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
 390                 dev_err(chip->dev,
 391                         "tpm_transmit: tpm_send: error %zd\n", rc);
 392                 goto out;
 393         }
 394
 395         if (chip->vendor.irq)
 396                 goto out_recv;
 397
 398         stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
 399         do {
 400                 u8 status = chip->vendor.status(chip);
 401                 if ((status & chip->vendor.req_complete_mask) ==
 402                     chip->vendor.req_complete_val)
 403                         goto out_recv;
 404
 405                 if ((status == chip->vendor.req_canceled)) {
 406                         dev_err(chip->dev, "Operation Canceled\n");
 407                         rc = -ECANCELED;
 408                         goto out;
 409                 }
 410
 411                 msleep(TPM_TIMEOUT);    /* CHECK */
 412                 rmb();
 413         } while (time_before(jiffies, stop));
 414
 415         chip->vendor.cancel(chip);
 416         dev_err(chip->dev, "Operation Timed out\n");
 417         rc = -ETIME;
 418         goto out;
 419
 420 out_recv:
 421         rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
 422         if (rc < 0)
 423                 dev_err(chip->dev,
 424                         "tpm_transmit: tpm_recv: error %zd\n", rc);
 425 out:
 426         mutex_unlock(&chip->tpm_mutex);
 427         return rc;
 428 }
 429
 430 #define TPM_DIGEST_SIZE 20
 431 #define TPM_ERROR_SIZE 10
 432 #define TPM_RET_CODE_IDX 6
 433
 434 enum tpm_capabilities {
 435         TPM_CAP_FLAG = cpu_to_be32(4),
 436         TPM_CAP_PROP = cpu_to_be32(5),
 437         CAP_VERSION_1_1 = cpu_to_be32(0x06),
 438         CAP_VERSION_1_2 = cpu_to_be32(0x1A)
 439 };
 440
 441 enum tpm_sub_capabilities {
 442         TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
 443         TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
 444         TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
 445         TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
 446         TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
 447         TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
 448         TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
 449
 450 };
 451
 452 static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
 453                             int len, const char *desc)
 454 {
 455         int err;
 456
 457         len = tpm_transmit(chip,(u8 *) cmd, len);
 458         if (len <  0)
 459                 return len;
 460         if (len == TPM_ERROR_SIZE) {
 461                 err = be32_to_cpu(cmd->header.out.return_code);
 462                 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
 463                 return err;
 464         }
 465         return 0;
 466 }
 467
 468 #define TPM_INTERNAL_RESULT_SIZE 200
 469 #define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
 470 #define TPM_ORD_GET_CAP cpu_to_be32(101)
 471
 472 static const struct tpm_input_header tpm_getcap_header = {
 473         .tag = TPM_TAG_RQU_COMMAND,
 474         .length = cpu_to_be32(22),
 475         .ordinal = TPM_ORD_GET_CAP
 476 };
 477
 478 ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
 479                    const char *desc)
 480 {
 481         struct tpm_cmd_t tpm_cmd;
 482         int rc;
 483         struct tpm_chip *chip = dev_get_drvdata(dev);
 484
 485         tpm_cmd.header.in = tpm_getcap_header;
 486         if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {
 487                 tpm_cmd.params.getcap_in.cap = subcap_id;
 488                 /*subcap field not necessary */
 489                 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
 490                 tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
 491         } else {
 492                 if (subcap_id == TPM_CAP_FLAG_PERM ||
 493                     subcap_id == TPM_CAP_FLAG_VOL)
 494                         tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
 495                 else
 496                         tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
 497                 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 498                 tpm_cmd.params.getcap_in.subcap = subcap_id;
 499         }
 500         rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
 501         if (!rc)
 502                 *cap = tpm_cmd.params.getcap_out.cap;
 503         return rc;
 504 }
 505
 506 void tpm_gen_interrupt(struct tpm_chip *chip)
 507 {
 508         struct  tpm_cmd_t tpm_cmd;
 509         ssize_t rc;
 510
 511         tpm_cmd.header.in = tpm_getcap_header;
 512         tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
 513         tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 514         tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
 515
 516         rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
 517                         "attempting to determine the timeouts");
 518 }
 519 EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
 520
 521 void tpm_get_timeouts(struct tpm_chip *chip)
 522 {
 523         struct tpm_cmd_t tpm_cmd;
 524         struct timeout_t *timeout_cap;
 525         struct duration_t *duration_cap;
 526         ssize_t rc;
 527         u32 timeout;
 528
 529         tpm_cmd.header.in = tpm_getcap_header;
 530         tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
 531         tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 532         tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
 533
 534         rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
 535                         "attempting to determine the timeouts");
 536         if (rc)
 537                 goto duration;
 538
 539         if (be32_to_cpu(tpm_cmd.header.out.length)
 540             != 4 * sizeof(u32))
 541                 goto duration;
 542
 543         timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
 544         /* Don't overwrite default if value is 0 */
 545         timeout = be32_to_cpu(timeout_cap->a);
 546         if (timeout)
 547                 chip->vendor.timeout_a = usecs_to_jiffies(timeout);
 548         timeout = be32_to_cpu(timeout_cap->b);
 549         if (timeout)
 550                 chip->vendor.timeout_b = usecs_to_jiffies(timeout);
 551         timeout = be32_to_cpu(timeout_cap->c);
 552         if (timeout)
 553                 chip->vendor.timeout_c = usecs_to_jiffies(timeout);
 554         timeout = be32_to_cpu(timeout_cap->d);
 555         if (timeout)
 556                 chip->vendor.timeout_d = usecs_to_jiffies(timeout);
 557
 558 duration:
 559         tpm_cmd.header.in = tpm_getcap_header;
 560         tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
 561         tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 562         tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
 563
 564         rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
 565                         "attempting to determine the durations");
 566         if (rc)
 567                 return;
 568
 569         if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
 570             be32_to_cpu(tpm_cmd.header.out.length)
 571             != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
 572                 return;
 573
 574         duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
 575         chip->vendor.duration[TPM_SHORT] =
 576             usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
 577         /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
 578          * value wrong and apparently reports msecs rather than usecs. So we
 579          * fix up the resulting too-small TPM_SHORT value to make things work.
 580          */
 581         if (chip->vendor.duration[TPM_SHORT] < (HZ/100))
 582                 chip->vendor.duration[TPM_SHORT] = HZ;
 583
 584         chip->vendor.duration[TPM_MEDIUM] =
 585             usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
 586         chip->vendor.duration[TPM_LONG] =
 587             usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
 588 }
 589 EXPORT_SYMBOL_GPL(tpm_get_timeouts);
 590
 591 void tpm_continue_selftest(struct tpm_chip *chip)
 592 {
 593         u8 data[] = {
 594                 0, 193,                 /* TPM_TAG_RQU_COMMAND */
 595                 0, 0, 0, 10,            /* length */
 596                 0, 0, 0, 83,            /* TPM_ORD_GetCapability */
 597         };
 598
 599         tpm_transmit(chip, data, sizeof(data));
 600 }
 601 EXPORT_SYMBOL_GPL(tpm_continue_selftest);
 602
 603 ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
 604                         char *buf)
 605 {
 606         cap_t cap;
 607         ssize_t rc;
 608
 609         rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
 610                          "attempting to determine the permanent enabled state");
 611         if (rc)
 612                 return 0;
 613
 614         rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
 615         return rc;
 616 }
 617 EXPORT_SYMBOL_GPL(tpm_show_enabled);
 618
 619 ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
 620                         char *buf)
 621 {
 622         cap_t cap;
 623         ssize_t rc;
 624
 625         rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
 626                          "attempting to determine the permanent active state");
 627         if (rc)
 628                 return 0;
 629
 630         rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
 631         return rc;
 632 }
 633 EXPORT_SYMBOL_GPL(tpm_show_active);
 634
 635 ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
 636                         char *buf)
 637 {
 638         cap_t cap;
 639         ssize_t rc;
 640
 641         rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
 642                          "attempting to determine the owner state");
 643         if (rc)
 644                 return 0;
 645
 646         rc = sprintf(buf, "%d\n", cap.owned);
 647         return rc;
 648 }
 649 EXPORT_SYMBOL_GPL(tpm_show_owned);
 650
 651 ssize_t tpm_show_temp_deactivated(struct device * dev,
 652                                 struct device_attribute * attr, char *buf)
 653 {
 654         cap_t cap;
 655         ssize_t rc;
 656
 657         rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
 658                          "attempting to determine the temporary state");
 659         if (rc)
 660                 return 0;
 661
 662         rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
 663         return rc;
 664 }
 665 EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
 666
 667 /*
 668  * tpm_chip_find_get - return tpm_chip for given chip number
 669  */
 670 static struct tpm_chip *tpm_chip_find_get(int chip_num)
 671 {
 672         struct tpm_chip *pos, *chip = NULL;
 673
 674         rcu_read_lock();
 675         list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
 676                 if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
 677                         continue;
 678
 679                 if (try_module_get(pos->dev->driver->owner)) {
 680                         chip = pos;
 681                         break;
 682                 }
 683         }
 684         rcu_read_unlock();
 685         return chip;
 686 }
 687
 688 #define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
 689 #define READ_PCR_RESULT_SIZE 30
 690 static struct tpm_input_header pcrread_header = {
 691         .tag = TPM_TAG_RQU_COMMAND,
 692         .length = cpu_to_be32(14),
 693         .ordinal = TPM_ORDINAL_PCRREAD
 694 };
 695
 696 int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
 697 {
 698         int rc;
 699         struct tpm_cmd_t cmd;
 700
 701         cmd.header.in = pcrread_header;
 702         cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
 703         rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
 704                           "attempting to read a pcr value");
 705
 706         if (rc == 0)
 707                 memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
 708                        TPM_DIGEST_SIZE);
 709         return rc;
 710 }
 711
 712 /**
 713  * tpm_pcr_read - read a pcr value
 714  * @chip_num:   tpm idx # or ANY
 715  * @pcr_idx:    pcr idx to retrieve
 716  * @res_buf:    TPM_PCR value
 717  *              size of res_buf is 20 bytes (or NULL if you don't care)
 718  *
 719  * The TPM driver should be built-in, but for whatever reason it
 720  * isn't, protect against the chip disappearing, by incrementing
 721  * the module usage count.
 722  */
 723 int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
 724 {
 725         struct tpm_chip *chip;
 726         int rc;
 727
 728         chip = tpm_chip_find_get(chip_num);
 729         if (chip == NULL)
 730                 return -ENODEV;
 731         rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
 732         module_put(chip->dev->driver->owner);
 733         return rc;
 734 }
 735 EXPORT_SYMBOL_GPL(tpm_pcr_read);
 736
 737 /**
 738  * tpm_pcr_extend - extend pcr value with hash
 739  * @chip_num:   tpm idx # or AN&
 740  * @pcr_idx:    pcr idx to extend
 741  * @hash:       hash value used to extend pcr value
 742  *
 743  * The TPM driver should be built-in, but for whatever reason it
 744  * isn't, protect against the chip disappearing, by incrementing
 745  * the module usage count.
 746  */
 747 #define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
 748 #define EXTEND_PCR_RESULT_SIZE 34
 749 static struct tpm_input_header pcrextend_header = {
 750         .tag = TPM_TAG_RQU_COMMAND,
 751         .length = cpu_to_be32(34),
 752         .ordinal = TPM_ORD_PCR_EXTEND
 753 };
 754
 755 int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
 756 {
 757         struct tpm_cmd_t cmd;
 758         int rc;
 759         struct tpm_chip *chip;
 760
 761         chip = tpm_chip_find_get(chip_num);
 762         if (chip == NULL)
 763                 return -ENODEV;
 764
 765         cmd.header.in = pcrextend_header;
 766         cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
 767         memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
 768         rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
 769                           "attempting extend a PCR value");
 770
 771         module_put(chip->dev->driver->owner);
 772         return rc;
 773 }
 774 EXPORT_SYMBOL_GPL(tpm_pcr_extend);
 775
 776 ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
 777                       char *buf)
 778 {
 779         cap_t cap;
 780         u8 digest[TPM_DIGEST_SIZE];
 781         ssize_t rc;
 782         int i, j, num_pcrs;
 783         char *str = buf;
 784         struct tpm_chip *chip = dev_get_drvdata(dev);
 785
 786         rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
 787                         "attempting to determine the number of PCRS");
 788         if (rc)
 789                 return 0;
 790
 791         num_pcrs = be32_to_cpu(cap.num_pcrs);
 792         for (i = 0; i < num_pcrs; i++) {
 793                 rc = __tpm_pcr_read(chip, i, digest);
 794                 if (rc)
 795                         break;
 796                 str += sprintf(str, "PCR-%02d: ", i);
 797                 for (j = 0; j < TPM_DIGEST_SIZE; j++)
 798                         str += sprintf(str, "%02X ", digest[j]);
 799                 str += sprintf(str, "\n");
 800         }
 801         return str - buf;
 802 }
 803 EXPORT_SYMBOL_GPL(tpm_show_pcrs);
 804
 805 #define  READ_PUBEK_RESULT_SIZE 314
 806 #define TPM_ORD_READPUBEK cpu_to_be32(124)
 807 struct tpm_input_header tpm_readpubek_header = {
 808         .tag = TPM_TAG_RQU_COMMAND,
 809         .length = cpu_to_be32(30),
 810         .ordinal = TPM_ORD_READPUBEK
 811 };
 812
 813 ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
 814                        char *buf)
 815 {
 816         u8 *data;
 817         struct tpm_cmd_t tpm_cmd;
 818         ssize_t err;
 819         int i, rc;
 820         char *str = buf;
 821
 822         struct tpm_chip *chip = dev_get_drvdata(dev);
 823
 824         tpm_cmd.header.in = tpm_readpubek_header;
 825         err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
 826                         "attempting to read the PUBEK");
 827         if (err)
 828                 goto out;
 829
 830         /*
 831            ignore header 10 bytes
 832            algorithm 32 bits (1 == RSA )
 833            encscheme 16 bits
 834            sigscheme 16 bits
 835            parameters (RSA 12->bytes: keybit, #primes, expbit)
 836            keylenbytes 32 bits
 837            256 byte modulus
 838            ignore checksum 20 bytes
 839          */
 840         data = tpm_cmd.params.readpubek_out_buffer;
 841         str +=
 842             sprintf(str,
 843                     "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
 844                     "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
 845                     " %02X %02X %02X %02X %02X %02X %02X %02X\n"
 846                     "Modulus length: %d\nModulus: \n",
 847                     data[10], data[11], data[12], data[13], data[14],
 848                     data[15], data[16], data[17], data[22], data[23],
 849                     data[24], data[25], data[26], data[27], data[28],
 850                     data[29], data[30], data[31], data[32], data[33],
 851                     be32_to_cpu(*((__be32 *) (data + 34))));
 852
 853         for (i = 0; i < 256; i++) {
 854                 str += sprintf(str, "%02X ", data[i + 38]);
 855                 if ((i + 1) % 16 == 0)
 856                         str += sprintf(str, "\n");
 857         }
 858 out:
 859         rc = str - buf;
 860         return rc;
 861 }
 862 EXPORT_SYMBOL_GPL(tpm_show_pubek);
 863
 864
 865 ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
 866                       char *buf)
 867 {
 868         cap_t cap;
 869         ssize_t rc;
 870         char *str = buf;
 871
 872         rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
 873                         "attempting to determine the manufacturer");
 874         if (rc)
 875                 return 0;
 876         str += sprintf(str, "Manufacturer: 0x%x\n",
 877                        be32_to_cpu(cap.manufacturer_id));
 878
 879         rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
 880                         "attempting to determine the 1.1 version");
 881         if (rc)
 882                 return 0;
 883         str += sprintf(str,
 884                        "TCG version: %d.%d\nFirmware version: %d.%d\n",
 885                        cap.tpm_version.Major, cap.tpm_version.Minor,
 886                        cap.tpm_version.revMajor, cap.tpm_version.revMinor);
 887         return str - buf;
 888 }
 889 EXPORT_SYMBOL_GPL(tpm_show_caps);
 890
 891 ssize_t tpm_show_caps_1_2(struct device * dev,
 892                           struct device_attribute * attr, char *buf)
 893 {
 894         cap_t cap;
 895         ssize_t rc;
 896         char *str = buf;
 897
 898         rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
 899                         "attempting to determine the manufacturer");
 900         if (rc)
 901                 return 0;
 902         str += sprintf(str, "Manufacturer: 0x%x\n",
 903                        be32_to_cpu(cap.manufacturer_id));
 904         rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
 905                          "attempting to determine the 1.2 version");
 906         if (rc)
 907                 return 0;
 908         str += sprintf(str,
 909                        "TCG version: %d.%d\nFirmware version: %d.%d\n",
 910                        cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,
 911                        cap.tpm_version_1_2.revMajor,
 912                        cap.tpm_version_1_2.revMinor);
 913         return str - buf;
 914 }
 915 EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
 916
 917 ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr,
 918                           char *buf)
 919 {
 920         struct tpm_chip *chip = dev_get_drvdata(dev);
 921
 922         return sprintf(buf, "%d %d %d\n",
 923                        jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
 924                        jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
 925                        jiffies_to_usecs(chip->vendor.duration[TPM_LONG]));
 926 }
 927 EXPORT_SYMBOL_GPL(tpm_show_timeouts);
 928
 929 ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
 930                         const char *buf, size_t count)
 931 {
 932         struct tpm_chip *chip = dev_get_drvdata(dev);
 933         if (chip == NULL)
 934                 return 0;
 935
 936         chip->vendor.cancel(chip);
 937         return count;
 938 }
 939 EXPORT_SYMBOL_GPL(tpm_store_cancel);
 940
 941 /*
 942  * Device file system interface to the TPM
 943  *
 944  * It's assured that the chip will be opened just once,
 945  * by the check of is_open variable, which is protected
 946  * by driver_lock.
 947  */
 948 int tpm_open(struct inode *inode, struct file *file)
 949 {
 950         int minor = iminor(inode);
 951         struct tpm_chip *chip = NULL, *pos;
 952
 953         rcu_read_lock();
 954         list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
 955                 if (pos->vendor.miscdev.minor == minor) {
 956                         chip = pos;
 957                         get_device(chip->dev);
 958                         break;
 959                 }
 960         }
 961         rcu_read_unlock();
 962
 963         if (!chip)
 964                 return -ENODEV;
 965
 966         if (test_and_set_bit(0, &chip->is_open)) {
 967                 dev_dbg(chip->dev, "Another process owns this TPM\n");
 968                 put_device(chip->dev);
 969                 return -EBUSY;
 970         }
 971
 972         chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
 973         if (chip->data_buffer == NULL) {
 974                 clear_bit(0, &chip->is_open);
 975                 put_device(chip->dev);
 976                 return -ENOMEM;
 977         }
 978
 979         atomic_set(&chip->data_pending, 0);
 980
 981         file->private_data = chip;
 982         return 0;
 983 }
 984 EXPORT_SYMBOL_GPL(tpm_open);
 985
 986 /*
 987  * Called on file close
 988  */
 989 int tpm_release(struct inode *inode, struct file *file)
 990 {
 991         struct tpm_chip *chip = file->private_data;
 992
 993         del_singleshot_timer_sync(&chip->user_read_timer);
 994         flush_scheduled_work();
 995         file->private_data = NULL;
 996         atomic_set(&chip->data_pending, 0);
 997         kfree(chip->data_buffer);
 998         clear_bit(0, &chip->is_open);
 999         put_device(chip->dev);
1000         return 0;
1001 }
1002 EXPORT_SYMBOL_GPL(tpm_release);
1003
1004 ssize_t tpm_write(struct file *file, const char __user *buf,
1005                   size_t size, loff_t *off)
1006 {
1007         struct tpm_chip *chip = file->private_data;
1008         size_t in_size = size, out_size;
1009
1010         /* cannot perform a write until the read has cleared
1011            either via tpm_read or a user_read_timer timeout */
1012         while (atomic_read(&chip->data_pending) != 0)
1013                 msleep(TPM_TIMEOUT);
1014
1015         mutex_lock(&chip->buffer_mutex);
1016
1017         if (in_size > TPM_BUFSIZE)
1018                 in_size = TPM_BUFSIZE;
1019
1020         if (copy_from_user
1021             (chip->data_buffer, (void __user *) buf, in_size)) {
1022                 mutex_unlock(&chip->buffer_mutex);
1023                 return -EFAULT;
1024         }
1025
1026         /* atomic tpm command send and result receive */
1027         out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1028
1029         atomic_set(&chip->data_pending, out_size);
1030         mutex_unlock(&chip->buffer_mutex);
1031
1032         /* Set a timeout by which the reader must come claim the result */
1033         mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1034
1035         return in_size;
1036 }
1037 EXPORT_SYMBOL_GPL(tpm_write);
1038
1039 ssize_t tpm_read(struct file *file, char __user *buf,
1040                  size_t size, loff_t *off)
1041 {
1042         struct tpm_chip *chip = file->private_data;
1043         ssize_t ret_size;
1044
1045         del_singleshot_timer_sync(&chip->user_read_timer);
1046         flush_scheduled_work();
1047         ret_size = atomic_read(&chip->data_pending);
1048         atomic_set(&chip->data_pending, 0);
1049         if (ret_size > 0) {     /* relay data */
1050                 if (size < ret_size)
1051                         ret_size = size;
1052
1053                 mutex_lock(&chip->buffer_mutex);
1054                 if (copy_to_user(buf, chip->data_buffer, ret_size))
1055                         ret_size = -EFAULT;
1056                 mutex_unlock(&chip->buffer_mutex);
1057         }
1058
1059         return ret_size;
1060 }
1061 EXPORT_SYMBOL_GPL(tpm_read);
1062
1063 void tpm_remove_hardware(struct device *dev)
1064 {
1065         struct tpm_chip *chip = dev_get_drvdata(dev);
1066
1067         if (chip == NULL) {
1068                 dev_err(dev, "No device data found\n");
1069                 return;
1070         }
1071
1072         spin_lock(&driver_lock);
1073         list_del_rcu(&chip->list);
1074         spin_unlock(&driver_lock);
1075         synchronize_rcu();
1076
1077         misc_deregister(&chip->vendor.miscdev);
1078         sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
1079         tpm_bios_log_teardown(chip->bios_dir);
1080
1081         /* write it this way to be explicit (chip->dev == dev) */
1082         put_device(chip->dev);
1083 }
1084 EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1085
1086 /*
1087  * We are about to suspend. Save the TPM state
1088  * so that it can be restored.
1089  */
1090 int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1091 {
1092         struct tpm_chip *chip = dev_get_drvdata(dev);
1093         u8 savestate[] = {
1094                 0, 193,         /* TPM_TAG_RQU_COMMAND */
1095                 0, 0, 0, 10,    /* blob length (in bytes) */
1096                 0, 0, 0, 152    /* TPM_ORD_SaveState */
1097         };
1098
1099         if (chip == NULL)
1100                 return -ENODEV;
1101
1102         tpm_transmit(chip, savestate, sizeof(savestate));
1103         return 0;
1104 }
1105 EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1106
1107 /*
1108  * Resume from a power safe. The BIOS already restored
1109  * the TPM state.
1110  */
1111 int tpm_pm_resume(struct device *dev)
1112 {
1113         struct tpm_chip *chip = dev_get_drvdata(dev);
1114
1115         if (chip == NULL)
1116                 return -ENODEV;
1117
1118         return 0;
1119 }
1120 EXPORT_SYMBOL_GPL(tpm_pm_resume);
1121
1122 /* In case vendor provided release function, call it too.*/
1123
1124 void tpm_dev_vendor_release(struct tpm_chip *chip)
1125 {
1126         if (chip->vendor.release)
1127                 chip->vendor.release(chip->dev);
1128
1129         clear_bit(chip->dev_num, dev_mask);
1130         kfree(chip->vendor.miscdev.name);
1131 }
1132 EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1133
1134
1135 /*
1136  * Once all references to platform device are down to 0,
1137  * release all allocated structures.
1138  */
1139 void tpm_dev_release(struct device *dev)
1140 {
1141         struct tpm_chip *chip = dev_get_drvdata(dev);
1142
1143         tpm_dev_vendor_release(chip);
1144
1145         chip->release(dev);
1146         kfree(chip);
1147 }
1148 EXPORT_SYMBOL_GPL(tpm_dev_release);
1149
1150 /*
1151  * Called from tpm_<specific>.c probe function only for devices
1152  * the driver has determined it should claim.  Prior to calling
1153  * this function the specific probe function has called pci_enable_device
1154  * upon errant exit from this function specific probe function should call
1155  * pci_disable_device
1156  */
1157 struct tpm_chip *tpm_register_hardware(struct device *dev,
1158                                         const struct tpm_vendor_specific *entry)
1159 {
1160 #define DEVNAME_SIZE 7
1161
1162         char *devname;
1163         struct tpm_chip *chip;
1164
1165         /* Driver specific per-device data */
1166         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1167         devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1168
1169         if (chip == NULL || devname == NULL)
1170                 goto out_free;
1171
1172         mutex_init(&chip->buffer_mutex);
1173         mutex_init(&chip->tpm_mutex);
1174         INIT_LIST_HEAD(&chip->list);
1175
1176         INIT_WORK(&chip->work, timeout_work);
1177
1178         setup_timer(&chip->user_read_timer, user_reader_timeout,
1179                         (unsigned long)chip);
1180
1181         memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1182
1183         chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1184
1185         if (chip->dev_num >= TPM_NUM_DEVICES) {
1186                 dev_err(dev, "No available tpm device numbers\n");
1187                 goto out_free;
1188         } else if (chip->dev_num == 0)
1189                 chip->vendor.miscdev.minor = TPM_MINOR;
1190         else
1191                 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1192
1193         set_bit(chip->dev_num, dev_mask);
1194
1195         scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
1196         chip->vendor.miscdev.name = devname;
1197
1198         chip->vendor.miscdev.parent = dev;
1199         chip->dev = get_device(dev);
1200         chip->release = dev->release;
1201         dev->release = tpm_dev_release;
1202         dev_set_drvdata(dev, chip);
1203
1204         if (misc_register(&chip->vendor.miscdev)) {
1205                 dev_err(chip->dev,
1206                         "unable to misc_register %s, minor %d\n",
1207                         chip->vendor.miscdev.name,
1208                         chip->vendor.miscdev.minor);
1209                 put_device(chip->dev);
1210                 return NULL;
1211         }
1212
1213         if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
1214                 misc_deregister(&chip->vendor.miscdev);
1215                 put_device(chip->dev);
1216
1217                 return NULL;
1218         }
1219
1220         chip->bios_dir = tpm_bios_log_setup(devname);
1221
1222         /* Make chip available */
1223         spin_lock(&driver_lock);
1224         list_add_rcu(&chip->list, &tpm_chip_list);
1225         spin_unlock(&driver_lock);
1226
1227         return chip;
1228
1229 out_free:
1230         kfree(chip);
1231         kfree(devname);
1232         return NULL;
1233 }
1234 EXPORT_SYMBOL_GPL(tpm_register_hardware);
1235
1236 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1237 MODULE_DESCRIPTION("TPM Driver");
1238 MODULE_VERSION("2.0");
1239 MODULE_LICENSE("GPL");