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/slab.h>
  28 #include <linux/mutex.h>
  29 #include <linux/spinlock.h>
  30
  31 #include "tpm.h"
  32
  33 enum tpm_const {
  34         TPM_MINOR = 224,        /* officially assigned */
  35         TPM_BUFSIZE = 4096,
  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 /*
  51  * Bug workaround - some TPM's don't flush the most
  52  * recently changed pcr on suspend, so force the flush
  53  * with an extend to the selected _unused_ non-volatile pcr.
  54  */
  55 static int tpm_suspend_pcr;
  56 module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
  57 MODULE_PARM_DESC(suspend_pcr,
  58                  "PCR to use for dummy writes to faciltate flush on suspend.");
  59
  60 static LIST_HEAD(tpm_chip_list);
  61 static DEFINE_SPINLOCK(driver_lock);
  62 static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
  63
  64 /*
  65  * Array with one entry per ordinal defining the maximum amount
  66  * of time the chip could take to return the result.  The ordinal
  67  * designation of short, medium or long is defined in a table in
  68  * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
  69  * values of the SHORT, MEDIUM, and LONG durations are retrieved
  70  * from the chip during initialization with a call to tpm_get_timeouts.
  71  */
  72 static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
  73         TPM_UNDEFINED,          /* 0 */
  74         TPM_UNDEFINED,
  75         TPM_UNDEFINED,
  76         TPM_UNDEFINED,
  77         TPM_UNDEFINED,
  78         TPM_UNDEFINED,          /* 5 */
  79         TPM_UNDEFINED,
  80         TPM_UNDEFINED,
  81         TPM_UNDEFINED,
  82         TPM_UNDEFINED,
  83         TPM_SHORT,              /* 10 */
  84         TPM_SHORT,
  85 };
  86
  87 static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
  88         TPM_UNDEFINED,          /* 0 */
  89         TPM_UNDEFINED,
  90         TPM_UNDEFINED,
  91         TPM_UNDEFINED,
  92         TPM_UNDEFINED,
  93         TPM_UNDEFINED,          /* 5 */
  94         TPM_UNDEFINED,
  95         TPM_UNDEFINED,
  96         TPM_UNDEFINED,
  97         TPM_UNDEFINED,
  98         TPM_SHORT,              /* 10 */
  99         TPM_SHORT,
 100         TPM_MEDIUM,
 101         TPM_LONG,
 102         TPM_LONG,
 103         TPM_MEDIUM,             /* 15 */
 104         TPM_SHORT,
 105         TPM_SHORT,
 106         TPM_MEDIUM,
 107         TPM_LONG,
 108         TPM_SHORT,              /* 20 */
 109         TPM_SHORT,
 110         TPM_MEDIUM,
 111         TPM_MEDIUM,
 112         TPM_MEDIUM,
 113         TPM_SHORT,              /* 25 */
 114         TPM_SHORT,
 115         TPM_MEDIUM,
 116         TPM_SHORT,
 117         TPM_SHORT,
 118         TPM_MEDIUM,             /* 30 */
 119         TPM_LONG,
 120         TPM_MEDIUM,
 121         TPM_SHORT,
 122         TPM_SHORT,
 123         TPM_SHORT,              /* 35 */
 124         TPM_MEDIUM,
 125         TPM_MEDIUM,
 126         TPM_UNDEFINED,
 127         TPM_UNDEFINED,
 128         TPM_MEDIUM,             /* 40 */
 129         TPM_LONG,
 130         TPM_MEDIUM,
 131         TPM_SHORT,
 132         TPM_SHORT,
 133         TPM_SHORT,              /* 45 */
 134         TPM_SHORT,
 135         TPM_SHORT,
 136         TPM_SHORT,
 137         TPM_LONG,
 138         TPM_MEDIUM,             /* 50 */
 139         TPM_MEDIUM,
 140         TPM_UNDEFINED,
 141         TPM_UNDEFINED,
 142         TPM_UNDEFINED,
 143         TPM_UNDEFINED,          /* 55 */
 144         TPM_UNDEFINED,
 145         TPM_UNDEFINED,
 146         TPM_UNDEFINED,
 147         TPM_UNDEFINED,
 148         TPM_MEDIUM,             /* 60 */
 149         TPM_MEDIUM,
 150         TPM_MEDIUM,
 151         TPM_SHORT,
 152         TPM_SHORT,
 153         TPM_MEDIUM,             /* 65 */
 154         TPM_UNDEFINED,
 155         TPM_UNDEFINED,
 156         TPM_UNDEFINED,
 157         TPM_UNDEFINED,
 158         TPM_SHORT,              /* 70 */
 159         TPM_SHORT,
 160         TPM_UNDEFINED,
 161         TPM_UNDEFINED,
 162         TPM_UNDEFINED,
 163         TPM_UNDEFINED,          /* 75 */
 164         TPM_UNDEFINED,
 165         TPM_UNDEFINED,
 166         TPM_UNDEFINED,
 167         TPM_UNDEFINED,
 168         TPM_LONG,               /* 80 */
 169         TPM_UNDEFINED,
 170         TPM_MEDIUM,
 171         TPM_LONG,
 172         TPM_SHORT,
 173         TPM_UNDEFINED,          /* 85 */
 174         TPM_UNDEFINED,
 175         TPM_UNDEFINED,
 176         TPM_UNDEFINED,
 177         TPM_UNDEFINED,
 178         TPM_SHORT,              /* 90 */
 179         TPM_SHORT,
 180         TPM_SHORT,
 181         TPM_SHORT,
 182         TPM_SHORT,
 183         TPM_UNDEFINED,          /* 95 */
 184         TPM_UNDEFINED,
 185         TPM_UNDEFINED,
 186         TPM_UNDEFINED,
 187         TPM_UNDEFINED,
 188         TPM_MEDIUM,             /* 100 */
 189         TPM_SHORT,
 190         TPM_SHORT,
 191         TPM_UNDEFINED,
 192         TPM_UNDEFINED,
 193         TPM_UNDEFINED,          /* 105 */
 194         TPM_UNDEFINED,
 195         TPM_UNDEFINED,
 196         TPM_UNDEFINED,
 197         TPM_UNDEFINED,
 198         TPM_SHORT,              /* 110 */
 199         TPM_SHORT,
 200         TPM_SHORT,
 201         TPM_SHORT,
 202         TPM_SHORT,
 203         TPM_SHORT,              /* 115 */
 204         TPM_SHORT,
 205         TPM_SHORT,
 206         TPM_UNDEFINED,
 207         TPM_UNDEFINED,
 208         TPM_LONG,               /* 120 */
 209         TPM_LONG,
 210         TPM_MEDIUM,
 211         TPM_UNDEFINED,
 212         TPM_SHORT,
 213         TPM_SHORT,              /* 125 */
 214         TPM_SHORT,
 215         TPM_LONG,
 216         TPM_SHORT,
 217         TPM_SHORT,
 218         TPM_SHORT,              /* 130 */
 219         TPM_MEDIUM,
 220         TPM_UNDEFINED,
 221         TPM_SHORT,
 222         TPM_MEDIUM,
 223         TPM_UNDEFINED,          /* 135 */
 224         TPM_UNDEFINED,
 225         TPM_UNDEFINED,
 226         TPM_UNDEFINED,
 227         TPM_UNDEFINED,
 228         TPM_SHORT,              /* 140 */
 229         TPM_SHORT,
 230         TPM_UNDEFINED,
 231         TPM_UNDEFINED,
 232         TPM_UNDEFINED,
 233         TPM_UNDEFINED,          /* 145 */
 234         TPM_UNDEFINED,
 235         TPM_UNDEFINED,
 236         TPM_UNDEFINED,
 237         TPM_UNDEFINED,
 238         TPM_SHORT,              /* 150 */
 239         TPM_MEDIUM,
 240         TPM_MEDIUM,
 241         TPM_SHORT,
 242         TPM_SHORT,
 243         TPM_UNDEFINED,          /* 155 */
 244         TPM_UNDEFINED,
 245         TPM_UNDEFINED,
 246         TPM_UNDEFINED,
 247         TPM_UNDEFINED,
 248         TPM_SHORT,              /* 160 */
 249         TPM_SHORT,
 250         TPM_SHORT,
 251         TPM_SHORT,
 252         TPM_UNDEFINED,
 253         TPM_UNDEFINED,          /* 165 */
 254         TPM_UNDEFINED,
 255         TPM_UNDEFINED,
 256         TPM_UNDEFINED,
 257         TPM_UNDEFINED,
 258         TPM_LONG,               /* 170 */
 259         TPM_UNDEFINED,
 260         TPM_UNDEFINED,
 261         TPM_UNDEFINED,
 262         TPM_UNDEFINED,
 263         TPM_UNDEFINED,          /* 175 */
 264         TPM_UNDEFINED,
 265         TPM_UNDEFINED,
 266         TPM_UNDEFINED,
 267         TPM_UNDEFINED,
 268         TPM_MEDIUM,             /* 180 */
 269         TPM_SHORT,
 270         TPM_MEDIUM,
 271         TPM_MEDIUM,
 272         TPM_MEDIUM,
 273         TPM_MEDIUM,             /* 185 */
 274         TPM_SHORT,
 275         TPM_UNDEFINED,
 276         TPM_UNDEFINED,
 277         TPM_UNDEFINED,
 278         TPM_UNDEFINED,          /* 190 */
 279         TPM_UNDEFINED,
 280         TPM_UNDEFINED,
 281         TPM_UNDEFINED,
 282         TPM_UNDEFINED,
 283         TPM_UNDEFINED,          /* 195 */
 284         TPM_UNDEFINED,
 285         TPM_UNDEFINED,
 286         TPM_UNDEFINED,
 287         TPM_UNDEFINED,
 288         TPM_SHORT,              /* 200 */
 289         TPM_UNDEFINED,
 290         TPM_UNDEFINED,
 291         TPM_UNDEFINED,
 292         TPM_SHORT,
 293         TPM_SHORT,              /* 205 */
 294         TPM_SHORT,
 295         TPM_SHORT,
 296         TPM_SHORT,
 297         TPM_SHORT,
 298         TPM_MEDIUM,             /* 210 */
 299         TPM_UNDEFINED,
 300         TPM_MEDIUM,
 301         TPM_MEDIUM,
 302         TPM_MEDIUM,
 303         TPM_UNDEFINED,          /* 215 */
 304         TPM_MEDIUM,
 305         TPM_UNDEFINED,
 306         TPM_UNDEFINED,
 307         TPM_SHORT,
 308         TPM_SHORT,              /* 220 */
 309         TPM_SHORT,
 310         TPM_SHORT,
 311         TPM_SHORT,
 312         TPM_SHORT,
 313         TPM_UNDEFINED,          /* 225 */
 314         TPM_UNDEFINED,
 315         TPM_UNDEFINED,
 316         TPM_UNDEFINED,
 317         TPM_UNDEFINED,
 318         TPM_SHORT,              /* 230 */
 319         TPM_LONG,
 320         TPM_MEDIUM,
 321         TPM_UNDEFINED,
 322         TPM_UNDEFINED,
 323         TPM_UNDEFINED,          /* 235 */
 324         TPM_UNDEFINED,
 325         TPM_UNDEFINED,
 326         TPM_UNDEFINED,
 327         TPM_UNDEFINED,
 328         TPM_SHORT,              /* 240 */
 329         TPM_UNDEFINED,
 330         TPM_MEDIUM,
 331 };
 332
 333 static void user_reader_timeout(unsigned long ptr)
 334 {
 335         struct tpm_chip *chip = (struct tpm_chip *) ptr;
 336
 337         schedule_work(&chip->work);
 338 }
 339
 340 static void timeout_work(struct work_struct *work)
 341 {
 342         struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
 343
 344         mutex_lock(&chip->buffer_mutex);
 345         atomic_set(&chip->data_pending, 0);
 346         memset(chip->data_buffer, 0, TPM_BUFSIZE);
 347         mutex_unlock(&chip->buffer_mutex);
 348 }
 349
 350 /*
 351  * Returns max number of jiffies to wait
 352  */
 353 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
 354                                            u32 ordinal)
 355 {
 356         int duration_idx = TPM_UNDEFINED;
 357         int duration = 0;
 358
 359         if (ordinal < TPM_MAX_ORDINAL)
 360                 duration_idx = tpm_ordinal_duration[ordinal];
 361         else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
 362                  TPM_MAX_PROTECTED_ORDINAL)
 363                 duration_idx =
 364                     tpm_protected_ordinal_duration[ordinal &
 365                                                    TPM_PROTECTED_ORDINAL_MASK];
 366
 367         if (duration_idx != TPM_UNDEFINED)
 368                 duration = chip->vendor.duration[duration_idx];
 369         if (duration <= 0)
 370                 return 2 * 60 * HZ;
 371         else
 372                 return duration;
 373 }
 374 EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
 375
 376 /*
 377  * Internal kernel interface to transmit TPM commands
 378  */
 379 static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
 380                             size_t bufsiz)
 381 {
 382         ssize_t rc;
 383         u32 count, ordinal;
 384         unsigned long stop;
 385
 386         count = be32_to_cpu(*((__be32 *) (buf + 2)));
 387         ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
 388         if (count == 0)
 389                 return -ENODATA;
 390         if (count > bufsiz) {
 391                 dev_err(chip->dev,
 392                         "invalid count value %x %zx \n", count, bufsiz);
 393                 return -E2BIG;
 394         }
 395
 396         mutex_lock(&chip->tpm_mutex);
 397
 398         if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
 399                 dev_err(chip->dev,
 400                         "tpm_transmit: tpm_send: error %zd\n", rc);
 401                 goto out;
 402         }
 403
 404         if (chip->vendor.irq)
 405                 goto out_recv;
 406
 407         stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
 408         do {
 409                 u8 status = chip->vendor.status(chip);
 410                 if ((status & chip->vendor.req_complete_mask) ==
 411                     chip->vendor.req_complete_val)
 412                         goto out_recv;
 413
 414                 if ((status == chip->vendor.req_canceled)) {
 415                         dev_err(chip->dev, "Operation Canceled\n");
 416                         rc = -ECANCELED;
 417                         goto out;
 418                 }
 419
 420                 msleep(TPM_TIMEOUT);    /* CHECK */
 421                 rmb();
 422         } while (time_before(jiffies, stop));
 423
 424         chip->vendor.cancel(chip);
 425         dev_err(chip->dev, "Operation Timed out\n");
 426         rc = -ETIME;
 427         goto out;
 428
 429 out_recv:
 430         rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
 431         if (rc < 0)
 432                 dev_err(chip->dev,
 433                         "tpm_transmit: tpm_recv: error %zd\n", rc);
 434 out:
 435         mutex_unlock(&chip->tpm_mutex);
 436         return rc;
 437 }
 438
 439 #define TPM_DIGEST_SIZE 20
 440 #define TPM_ERROR_SIZE 10
 441 #define TPM_RET_CODE_IDX 6
 442
 443 enum tpm_capabilities {
 444         TPM_CAP_FLAG = cpu_to_be32(4),
 445         TPM_CAP_PROP = cpu_to_be32(5),
 446         CAP_VERSION_1_1 = cpu_to_be32(0x06),
 447         CAP_VERSION_1_2 = cpu_to_be32(0x1A)
 448 };
 449
 450 enum tpm_sub_capabilities {
 451         TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
 452         TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
 453         TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
 454         TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
 455         TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
 456         TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
 457         TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
 458
 459 };
 460
 461 static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
 462                             int len, const char *desc)
 463 {
 464         int err;
 465
 466         len = tpm_transmit(chip,(u8 *) cmd, len);
 467         if (len <  0)
 468                 return len;
 469         if (len == TPM_ERROR_SIZE) {
 470                 err = be32_to_cpu(cmd->header.out.return_code);
 471                 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
 472                 return err;
 473         }
 474         return 0;
 475 }
 476
 477 #define TPM_INTERNAL_RESULT_SIZE 200
 478 #define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
 479 #define TPM_ORD_GET_CAP cpu_to_be32(101)
 480
 481 static const struct tpm_input_header tpm_getcap_header = {
 482         .tag = TPM_TAG_RQU_COMMAND,
 483         .length = cpu_to_be32(22),
 484         .ordinal = TPM_ORD_GET_CAP
 485 };
 486
 487 ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
 488                    const char *desc)
 489 {
 490         struct tpm_cmd_t tpm_cmd;
 491         int rc;
 492         struct tpm_chip *chip = dev_get_drvdata(dev);
 493
 494         tpm_cmd.header.in = tpm_getcap_header;
 495         if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {
 496                 tpm_cmd.params.getcap_in.cap = subcap_id;
 497                 /*subcap field not necessary */
 498                 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
 499                 tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
 500         } else {
 501                 if (subcap_id == TPM_CAP_FLAG_PERM ||
 502                     subcap_id == TPM_CAP_FLAG_VOL)
 503                         tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
 504                 else
 505                         tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
 506                 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 507                 tpm_cmd.params.getcap_in.subcap = subcap_id;
 508         }
 509         rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
 510         if (!rc)
 511                 *cap = tpm_cmd.params.getcap_out.cap;
 512         return rc;
 513 }
 514
 515 void tpm_gen_interrupt(struct tpm_chip *chip)
 516 {
 517         struct  tpm_cmd_t tpm_cmd;
 518         ssize_t rc;
 519
 520         tpm_cmd.header.in = tpm_getcap_header;
 521         tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
 522         tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 523         tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
 524
 525         rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
 526                         "attempting to determine the timeouts");
 527 }
 528 EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
 529
 530 void tpm_get_timeouts(struct tpm_chip *chip)
 531 {
 532         struct tpm_cmd_t tpm_cmd;
 533         struct timeout_t *timeout_cap;
 534         struct duration_t *duration_cap;
 535         ssize_t rc;
 536         u32 timeout;
 537
 538         tpm_cmd.header.in = tpm_getcap_header;
 539         tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
 540         tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 541         tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
 542
 543         rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
 544                         "attempting to determine the timeouts");
 545         if (rc)
 546                 goto duration;
 547
 548         if (be32_to_cpu(tpm_cmd.header.out.length)
 549             != 4 * sizeof(u32))
 550                 goto duration;
 551
 552         timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
 553         /* Don't overwrite default if value is 0 */
 554         timeout = be32_to_cpu(timeout_cap->a);
 555         if (timeout)
 556                 chip->vendor.timeout_a = usecs_to_jiffies(timeout);
 557         timeout = be32_to_cpu(timeout_cap->b);
 558         if (timeout)
 559                 chip->vendor.timeout_b = usecs_to_jiffies(timeout);
 560         timeout = be32_to_cpu(timeout_cap->c);
 561         if (timeout)
 562                 chip->vendor.timeout_c = usecs_to_jiffies(timeout);
 563         timeout = be32_to_cpu(timeout_cap->d);
 564         if (timeout)
 565                 chip->vendor.timeout_d = usecs_to_jiffies(timeout);
 566
 567 duration:
 568         tpm_cmd.header.in = tpm_getcap_header;
 569         tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
 570         tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 571         tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
 572
 573         rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
 574                         "attempting to determine the durations");
 575         if (rc)
 576                 return;
 577
 578         if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
 579             be32_to_cpu(tpm_cmd.header.out.length)
 580             != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
 581                 return;
 582
 583         duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
 584         chip->vendor.duration[TPM_SHORT] =
 585             usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
 586         chip->vendor.duration[TPM_MEDIUM] =
 587             usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
 588         chip->vendor.duration[TPM_LONG] =
 589             usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
 590
 591         /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
 592          * value wrong and apparently reports msecs rather than usecs. So we
 593          * fix up the resulting too-small TPM_SHORT value to make things work.
 594          * We also scale the TPM_MEDIUM and -_LONG values by 1000.
 595          */
 596         if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) {
 597                 chip->vendor.duration[TPM_SHORT] = HZ;
 598                 chip->vendor.duration[TPM_MEDIUM] *= 1000;
 599                 chip->vendor.duration[TPM_LONG] *= 1000;
 600                 chip->vendor.duration_adjusted = true;
 601                 dev_info(chip->dev, "Adjusting TPM timeout parameters.");
 602         }
 603 }
 604 EXPORT_SYMBOL_GPL(tpm_get_timeouts);
 605
 606 void tpm_continue_selftest(struct tpm_chip *chip)
 607 {
 608         u8 data[] = {
 609                 0, 193,                 /* TPM_TAG_RQU_COMMAND */
 610                 0, 0, 0, 10,            /* length */
 611                 0, 0, 0, 83,            /* TPM_ORD_GetCapability */
 612         };
 613
 614         tpm_transmit(chip, data, sizeof(data));
 615 }
 616 EXPORT_SYMBOL_GPL(tpm_continue_selftest);
 617
 618 ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
 619                         char *buf)
 620 {
 621         cap_t cap;
 622         ssize_t rc;
 623
 624         rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
 625                          "attempting to determine the permanent enabled state");
 626         if (rc)
 627                 return 0;
 628
 629         rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
 630         return rc;
 631 }
 632 EXPORT_SYMBOL_GPL(tpm_show_enabled);
 633
 634 ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
 635                         char *buf)
 636 {
 637         cap_t cap;
 638         ssize_t rc;
 639
 640         rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
 641                          "attempting to determine the permanent active state");
 642         if (rc)
 643                 return 0;
 644
 645         rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
 646         return rc;
 647 }
 648 EXPORT_SYMBOL_GPL(tpm_show_active);
 649
 650 ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
 651                         char *buf)
 652 {
 653         cap_t cap;
 654         ssize_t rc;
 655
 656         rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
 657                          "attempting to determine the owner state");
 658         if (rc)
 659                 return 0;
 660
 661         rc = sprintf(buf, "%d\n", cap.owned);
 662         return rc;
 663 }
 664 EXPORT_SYMBOL_GPL(tpm_show_owned);
 665
 666 ssize_t tpm_show_temp_deactivated(struct device * dev,
 667                                 struct device_attribute * attr, char *buf)
 668 {
 669         cap_t cap;
 670         ssize_t rc;
 671
 672         rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
 673                          "attempting to determine the temporary state");
 674         if (rc)
 675                 return 0;
 676
 677         rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
 678         return rc;
 679 }
 680 EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
 681
 682 /*
 683  * tpm_chip_find_get - return tpm_chip for given chip number
 684  */
 685 static struct tpm_chip *tpm_chip_find_get(int chip_num)
 686 {
 687         struct tpm_chip *pos, *chip = NULL;
 688
 689         rcu_read_lock();
 690         list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
 691                 if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
 692                         continue;
 693
 694                 if (try_module_get(pos->dev->driver->owner)) {
 695                         chip = pos;
 696                         break;
 697                 }
 698         }
 699         rcu_read_unlock();
 700         return chip;
 701 }
 702
 703 #define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
 704 #define READ_PCR_RESULT_SIZE 30
 705 static struct tpm_input_header pcrread_header = {
 706         .tag = TPM_TAG_RQU_COMMAND,
 707         .length = cpu_to_be32(14),
 708         .ordinal = TPM_ORDINAL_PCRREAD
 709 };
 710
 711 int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
 712 {
 713         int rc;
 714         struct tpm_cmd_t cmd;
 715
 716         cmd.header.in = pcrread_header;
 717         cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
 718         rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
 719                           "attempting to read a pcr value");
 720
 721         if (rc == 0)
 722                 memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
 723                        TPM_DIGEST_SIZE);
 724         return rc;
 725 }
 726
 727 /**
 728  * tpm_pcr_read - read a pcr value
 729  * @chip_num:   tpm idx # or ANY
 730  * @pcr_idx:    pcr idx to retrieve
 731  * @res_buf:    TPM_PCR value
 732  *              size of res_buf is 20 bytes (or NULL if you don't care)
 733  *
 734  * The TPM driver should be built-in, but for whatever reason it
 735  * isn't, protect against the chip disappearing, by incrementing
 736  * the module usage count.
 737  */
 738 int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
 739 {
 740         struct tpm_chip *chip;
 741         int rc;
 742
 743         chip = tpm_chip_find_get(chip_num);
 744         if (chip == NULL)
 745                 return -ENODEV;
 746         rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
 747         tpm_chip_put(chip);
 748         return rc;
 749 }
 750 EXPORT_SYMBOL_GPL(tpm_pcr_read);
 751
 752 /**
 753  * tpm_pcr_extend - extend pcr value with hash
 754  * @chip_num:   tpm idx # or AN&
 755  * @pcr_idx:    pcr idx to extend
 756  * @hash:       hash value used to extend pcr value
 757  *
 758  * The TPM driver should be built-in, but for whatever reason it
 759  * isn't, protect against the chip disappearing, by incrementing
 760  * the module usage count.
 761  */
 762 #define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
 763 #define EXTEND_PCR_RESULT_SIZE 34
 764 static struct tpm_input_header pcrextend_header = {
 765         .tag = TPM_TAG_RQU_COMMAND,
 766         .length = cpu_to_be32(34),
 767         .ordinal = TPM_ORD_PCR_EXTEND
 768 };
 769
 770 int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
 771 {
 772         struct tpm_cmd_t cmd;
 773         int rc;
 774         struct tpm_chip *chip;
 775
 776         chip = tpm_chip_find_get(chip_num);
 777         if (chip == NULL)
 778                 return -ENODEV;
 779
 780         cmd.header.in = pcrextend_header;
 781         cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
 782         memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
 783         rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
 784                           "attempting extend a PCR value");
 785
 786         tpm_chip_put(chip);
 787         return rc;
 788 }
 789 EXPORT_SYMBOL_GPL(tpm_pcr_extend);
 790
 791 int tpm_send(u32 chip_num, void *cmd, size_t buflen)
 792 {
 793         struct tpm_chip *chip;
 794         int rc;
 795
 796         chip = tpm_chip_find_get(chip_num);
 797         if (chip == NULL)
 798                 return -ENODEV;
 799
 800         rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
 801
 802         tpm_chip_put(chip);
 803         return rc;
 804 }
 805 EXPORT_SYMBOL_GPL(tpm_send);
 806
 807 ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
 808                       char *buf)
 809 {
 810         cap_t cap;
 811         u8 digest[TPM_DIGEST_SIZE];
 812         ssize_t rc;
 813         int i, j, num_pcrs;
 814         char *str = buf;
 815         struct tpm_chip *chip = dev_get_drvdata(dev);
 816
 817         rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
 818                         "attempting to determine the number of PCRS");
 819         if (rc)
 820                 return 0;
 821
 822         num_pcrs = be32_to_cpu(cap.num_pcrs);
 823         for (i = 0; i < num_pcrs; i++) {
 824                 rc = __tpm_pcr_read(chip, i, digest);
 825                 if (rc)
 826                         break;
 827                 str += sprintf(str, "PCR-%02d: ", i);
 828                 for (j = 0; j < TPM_DIGEST_SIZE; j++)
 829                         str += sprintf(str, "%02X ", digest[j]);
 830                 str += sprintf(str, "\n");
 831         }
 832         return str - buf;
 833 }
 834 EXPORT_SYMBOL_GPL(tpm_show_pcrs);
 835
 836 #define  READ_PUBEK_RESULT_SIZE 314
 837 #define TPM_ORD_READPUBEK cpu_to_be32(124)
 838 struct tpm_input_header tpm_readpubek_header = {
 839         .tag = TPM_TAG_RQU_COMMAND,
 840         .length = cpu_to_be32(30),
 841         .ordinal = TPM_ORD_READPUBEK
 842 };
 843
 844 ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
 845                        char *buf)
 846 {
 847         u8 *data;
 848         struct tpm_cmd_t tpm_cmd;
 849         ssize_t err;
 850         int i, rc;
 851         char *str = buf;
 852
 853         struct tpm_chip *chip = dev_get_drvdata(dev);
 854
 855         tpm_cmd.header.in = tpm_readpubek_header;
 856         err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
 857                         "attempting to read the PUBEK");
 858         if (err)
 859                 goto out;
 860
 861         /*
 862            ignore header 10 bytes
 863            algorithm 32 bits (1 == RSA )
 864            encscheme 16 bits
 865            sigscheme 16 bits
 866            parameters (RSA 12->bytes: keybit, #primes, expbit)
 867            keylenbytes 32 bits
 868            256 byte modulus
 869            ignore checksum 20 bytes
 870          */
 871         data = tpm_cmd.params.readpubek_out_buffer;
 872         str +=
 873             sprintf(str,
 874                     "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
 875                     "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
 876                     " %02X %02X %02X %02X %02X %02X %02X %02X\n"
 877                     "Modulus length: %d\nModulus: \n",
 878                     data[10], data[11], data[12], data[13], data[14],
 879                     data[15], data[16], data[17], data[22], data[23],
 880                     data[24], data[25], data[26], data[27], data[28],
 881                     data[29], data[30], data[31], data[32], data[33],
 882                     be32_to_cpu(*((__be32 *) (data + 34))));
 883
 884         for (i = 0; i < 256; i++) {
 885                 str += sprintf(str, "%02X ", data[i + 38]);
 886                 if ((i + 1) % 16 == 0)
 887                         str += sprintf(str, "\n");
 888         }
 889 out:
 890         rc = str - buf;
 891         return rc;
 892 }
 893 EXPORT_SYMBOL_GPL(tpm_show_pubek);
 894
 895
 896 ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
 897                       char *buf)
 898 {
 899         cap_t cap;
 900         ssize_t rc;
 901         char *str = buf;
 902
 903         rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
 904                         "attempting to determine the manufacturer");
 905         if (rc)
 906                 return 0;
 907         str += sprintf(str, "Manufacturer: 0x%x\n",
 908                        be32_to_cpu(cap.manufacturer_id));
 909
 910         rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
 911                         "attempting to determine the 1.1 version");
 912         if (rc)
 913                 return 0;
 914         str += sprintf(str,
 915                        "TCG version: %d.%d\nFirmware version: %d.%d\n",
 916                        cap.tpm_version.Major, cap.tpm_version.Minor,
 917                        cap.tpm_version.revMajor, cap.tpm_version.revMinor);
 918         return str - buf;
 919 }
 920 EXPORT_SYMBOL_GPL(tpm_show_caps);
 921
 922 ssize_t tpm_show_caps_1_2(struct device * dev,
 923                           struct device_attribute * attr, char *buf)
 924 {
 925         cap_t cap;
 926         ssize_t rc;
 927         char *str = buf;
 928
 929         rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
 930                         "attempting to determine the manufacturer");
 931         if (rc)
 932                 return 0;
 933         str += sprintf(str, "Manufacturer: 0x%x\n",
 934                        be32_to_cpu(cap.manufacturer_id));
 935         rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
 936                          "attempting to determine the 1.2 version");
 937         if (rc)
 938                 return 0;
 939         str += sprintf(str,
 940                        "TCG version: %d.%d\nFirmware version: %d.%d\n",
 941                        cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,
 942                        cap.tpm_version_1_2.revMajor,
 943                        cap.tpm_version_1_2.revMinor);
 944         return str - buf;
 945 }
 946 EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
 947
 948 ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
 949                           char *buf)
 950 {
 951         struct tpm_chip *chip = dev_get_drvdata(dev);
 952
 953         return sprintf(buf, "%d %d %d [%s]\n",
 954                        jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
 955                        jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
 956                        jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
 957                        chip->vendor.duration_adjusted
 958                        ? "adjusted" : "original");
 959 }
 960 EXPORT_SYMBOL_GPL(tpm_show_durations);
 961
 962 ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
 963                         const char *buf, size_t count)
 964 {
 965         struct tpm_chip *chip = dev_get_drvdata(dev);
 966         if (chip == NULL)
 967                 return 0;
 968
 969         chip->vendor.cancel(chip);
 970         return count;
 971 }
 972 EXPORT_SYMBOL_GPL(tpm_store_cancel);
 973
 974 /*
 975  * Device file system interface to the TPM
 976  *
 977  * It's assured that the chip will be opened just once,
 978  * by the check of is_open variable, which is protected
 979  * by driver_lock.
 980  */
 981 int tpm_open(struct inode *inode, struct file *file)
 982 {
 983         int minor = iminor(inode);
 984         struct tpm_chip *chip = NULL, *pos;
 985
 986         rcu_read_lock();
 987         list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
 988                 if (pos->vendor.miscdev.minor == minor) {
 989                         chip = pos;
 990                         get_device(chip->dev);
 991                         break;
 992                 }
 993         }
 994         rcu_read_unlock();
 995
 996         if (!chip)
 997                 return -ENODEV;
 998
 999         if (test_and_set_bit(0, &chip->is_open)) {
1000                 dev_dbg(chip->dev, "Another process owns this TPM\n");
1001                 put_device(chip->dev);
1002                 return -EBUSY;
1003         }
1004
1005         chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
1006         if (chip->data_buffer == NULL) {
1007                 clear_bit(0, &chip->is_open);
1008                 put_device(chip->dev);
1009                 return -ENOMEM;
1010         }
1011
1012         atomic_set(&chip->data_pending, 0);
1013
1014         file->private_data = chip;
1015         return 0;
1016 }
1017 EXPORT_SYMBOL_GPL(tpm_open);
1018
1019 /*
1020  * Called on file close
1021  */
1022 int tpm_release(struct inode *inode, struct file *file)
1023 {
1024         struct tpm_chip *chip = file->private_data;
1025
1026         del_singleshot_timer_sync(&chip->user_read_timer);
1027         flush_work_sync(&chip->work);
1028         file->private_data = NULL;
1029         atomic_set(&chip->data_pending, 0);
1030         kfree(chip->data_buffer);
1031         clear_bit(0, &chip->is_open);
1032         put_device(chip->dev);
1033         return 0;
1034 }
1035 EXPORT_SYMBOL_GPL(tpm_release);
1036
1037 ssize_t tpm_write(struct file *file, const char __user *buf,
1038                   size_t size, loff_t *off)
1039 {
1040         struct tpm_chip *chip = file->private_data;
1041         size_t in_size = size, out_size;
1042
1043         /* cannot perform a write until the read has cleared
1044            either via tpm_read or a user_read_timer timeout */
1045         while (atomic_read(&chip->data_pending) != 0)
1046                 msleep(TPM_TIMEOUT);
1047
1048         mutex_lock(&chip->buffer_mutex);
1049
1050         if (in_size > TPM_BUFSIZE)
1051                 in_size = TPM_BUFSIZE;
1052
1053         if (copy_from_user
1054             (chip->data_buffer, (void __user *) buf, in_size)) {
1055                 mutex_unlock(&chip->buffer_mutex);
1056                 return -EFAULT;
1057         }
1058
1059         /* atomic tpm command send and result receive */
1060         out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1061
1062         atomic_set(&chip->data_pending, out_size);
1063         mutex_unlock(&chip->buffer_mutex);
1064
1065         /* Set a timeout by which the reader must come claim the result */
1066         mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1067
1068         return in_size;
1069 }
1070 EXPORT_SYMBOL_GPL(tpm_write);
1071
1072 ssize_t tpm_read(struct file *file, char __user *buf,
1073                  size_t size, loff_t *off)
1074 {
1075         struct tpm_chip *chip = file->private_data;
1076         ssize_t ret_size;
1077
1078         del_singleshot_timer_sync(&chip->user_read_timer);
1079         flush_work_sync(&chip->work);
1080         ret_size = atomic_read(&chip->data_pending);
1081         atomic_set(&chip->data_pending, 0);
1082         if (ret_size > 0) {     /* relay data */
1083                 if (size < ret_size)
1084                         ret_size = size;
1085
1086                 mutex_lock(&chip->buffer_mutex);
1087                 if (copy_to_user(buf, chip->data_buffer, ret_size))
1088                         ret_size = -EFAULT;
1089                 mutex_unlock(&chip->buffer_mutex);
1090         }
1091
1092         return ret_size;
1093 }
1094 EXPORT_SYMBOL_GPL(tpm_read);
1095
1096 void tpm_remove_hardware(struct device *dev)
1097 {
1098         struct tpm_chip *chip = dev_get_drvdata(dev);
1099
1100         if (chip == NULL) {
1101                 dev_err(dev, "No device data found\n");
1102                 return;
1103         }
1104
1105         spin_lock(&driver_lock);
1106         list_del_rcu(&chip->list);
1107         spin_unlock(&driver_lock);
1108         synchronize_rcu();
1109
1110         misc_deregister(&chip->vendor.miscdev);
1111         sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
1112         tpm_bios_log_teardown(chip->bios_dir);
1113
1114         /* write it this way to be explicit (chip->dev == dev) */
1115         put_device(chip->dev);
1116 }
1117 EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1118
1119 #define TPM_ORD_SAVESTATE cpu_to_be32(152)
1120 #define SAVESTATE_RESULT_SIZE 10
1121
1122 static struct tpm_input_header savestate_header = {
1123         .tag = TPM_TAG_RQU_COMMAND,
1124         .length = cpu_to_be32(10),
1125         .ordinal = TPM_ORD_SAVESTATE
1126 };
1127
1128 /*
1129  * We are about to suspend. Save the TPM state
1130  * so that it can be restored.
1131  */
1132 int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1133 {
1134         struct tpm_chip *chip = dev_get_drvdata(dev);
1135         struct tpm_cmd_t cmd;
1136         int rc;
1137
1138         u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
1139
1140         if (chip == NULL)
1141                 return -ENODEV;
1142
1143         /* for buggy tpm, flush pcrs with extend to selected dummy */
1144         if (tpm_suspend_pcr) {
1145                 cmd.header.in = pcrextend_header;
1146                 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
1147                 memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
1148                        TPM_DIGEST_SIZE);
1149                 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
1150                                   "extending dummy pcr before suspend");
1151         }
1152
1153         /* now do the actual savestate */
1154         cmd.header.in = savestate_header;
1155         rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE,
1156                           "sending savestate before suspend");
1157         return rc;
1158 }
1159 EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1160
1161 /*
1162  * Resume from a power safe. The BIOS already restored
1163  * the TPM state.
1164  */
1165 int tpm_pm_resume(struct device *dev)
1166 {
1167         struct tpm_chip *chip = dev_get_drvdata(dev);
1168
1169         if (chip == NULL)
1170                 return -ENODEV;
1171
1172         return 0;
1173 }
1174 EXPORT_SYMBOL_GPL(tpm_pm_resume);
1175
1176 /* In case vendor provided release function, call it too.*/
1177
1178 void tpm_dev_vendor_release(struct tpm_chip *chip)
1179 {
1180         if (chip->vendor.release)
1181                 chip->vendor.release(chip->dev);
1182
1183         clear_bit(chip->dev_num, dev_mask);
1184         kfree(chip->vendor.miscdev.name);
1185 }
1186 EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1187
1188
1189 /*
1190  * Once all references to platform device are down to 0,
1191  * release all allocated structures.
1192  */
1193 void tpm_dev_release(struct device *dev)
1194 {
1195         struct tpm_chip *chip = dev_get_drvdata(dev);
1196
1197         tpm_dev_vendor_release(chip);
1198
1199         chip->release(dev);
1200         kfree(chip);
1201 }
1202 EXPORT_SYMBOL_GPL(tpm_dev_release);
1203
1204 /*
1205  * Called from tpm_<specific>.c probe function only for devices
1206  * the driver has determined it should claim.  Prior to calling
1207  * this function the specific probe function has called pci_enable_device
1208  * upon errant exit from this function specific probe function should call
1209  * pci_disable_device
1210  */
1211 struct tpm_chip *tpm_register_hardware(struct device *dev,
1212                                         const struct tpm_vendor_specific *entry)
1213 {
1214 #define DEVNAME_SIZE 7
1215
1216         char *devname;
1217         struct tpm_chip *chip;
1218
1219         /* Driver specific per-device data */
1220         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1221         devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1222
1223         if (chip == NULL || devname == NULL)
1224                 goto out_free;
1225
1226         mutex_init(&chip->buffer_mutex);
1227         mutex_init(&chip->tpm_mutex);
1228         INIT_LIST_HEAD(&chip->list);
1229
1230         INIT_WORK(&chip->work, timeout_work);
1231
1232         setup_timer(&chip->user_read_timer, user_reader_timeout,
1233                         (unsigned long)chip);
1234
1235         memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1236
1237         chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1238
1239         if (chip->dev_num >= TPM_NUM_DEVICES) {
1240                 dev_err(dev, "No available tpm device numbers\n");
1241                 goto out_free;
1242         } else if (chip->dev_num == 0)
1243                 chip->vendor.miscdev.minor = TPM_MINOR;
1244         else
1245                 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1246
1247         set_bit(chip->dev_num, dev_mask);
1248
1249         scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
1250         chip->vendor.miscdev.name = devname;
1251
1252         chip->vendor.miscdev.parent = dev;
1253         chip->dev = get_device(dev);
1254         chip->release = dev->release;
1255         dev->release = tpm_dev_release;
1256         dev_set_drvdata(dev, chip);
1257
1258         if (misc_register(&chip->vendor.miscdev)) {
1259                 dev_err(chip->dev,
1260                         "unable to misc_register %s, minor %d\n",
1261                         chip->vendor.miscdev.name,
1262                         chip->vendor.miscdev.minor);
1263                 put_device(chip->dev);
1264                 return NULL;
1265         }
1266
1267         if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
1268                 misc_deregister(&chip->vendor.miscdev);
1269                 put_device(chip->dev);
1270
1271                 return NULL;
1272         }
1273
1274         chip->bios_dir = tpm_bios_log_setup(devname);
1275
1276         /* Make chip available */
1277         spin_lock(&driver_lock);
1278         list_add_rcu(&chip->list, &tpm_chip_list);
1279         spin_unlock(&driver_lock);
1280
1281         return chip;
1282
1283 out_free:
1284         kfree(chip);
1285         kfree(devname);
1286         return NULL;
1287 }
1288 EXPORT_SYMBOL_GPL(tpm_register_hardware);
1289
1290 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1291 MODULE_DESCRIPTION("TPM Driver");
1292 MODULE_VERSION("2.0");
1293 MODULE_LICENSE("GPL");