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         if (bufsiz > TPM_BUFSIZE)
 387                 bufsiz = TPM_BUFSIZE;
 388
 389         count = be32_to_cpu(*((__be32 *) (buf + 2)));
 390         ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
 391         if (count == 0)
 392                 return -ENODATA;
 393         if (count > bufsiz) {
 394                 dev_err(chip->dev,
 395                         "invalid count value %x %zx \n", count, bufsiz);
 396                 return -E2BIG;
 397         }
 398
 399         mutex_lock(&chip->tpm_mutex);
 400
 401         if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
 402                 dev_err(chip->dev,
 403                         "tpm_transmit: tpm_send: error %zd\n", rc);
 404                 goto out;
 405         }
 406
 407         if (chip->vendor.irq)
 408                 goto out_recv;
 409
 410         stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
 411         do {
 412                 u8 status = chip->vendor.status(chip);
 413                 if ((status & chip->vendor.req_complete_mask) ==
 414                     chip->vendor.req_complete_val)
 415                         goto out_recv;
 416
 417                 if ((status == chip->vendor.req_canceled)) {
 418                         dev_err(chip->dev, "Operation Canceled\n");
 419                         rc = -ECANCELED;
 420                         goto out;
 421                 }
 422
 423                 msleep(TPM_TIMEOUT);    /* CHECK */
 424                 rmb();
 425         } while (time_before(jiffies, stop));
 426
 427         chip->vendor.cancel(chip);
 428         dev_err(chip->dev, "Operation Timed out\n");
 429         rc = -ETIME;
 430         goto out;
 431
 432 out_recv:
 433         rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
 434         if (rc < 0)
 435                 dev_err(chip->dev,
 436                         "tpm_transmit: tpm_recv: error %zd\n", rc);
 437 out:
 438         mutex_unlock(&chip->tpm_mutex);
 439         return rc;
 440 }
 441
 442 #define TPM_DIGEST_SIZE 20
 443 #define TPM_ERROR_SIZE 10
 444 #define TPM_RET_CODE_IDX 6
 445
 446 enum tpm_capabilities {
 447         TPM_CAP_FLAG = cpu_to_be32(4),
 448         TPM_CAP_PROP = cpu_to_be32(5),
 449         CAP_VERSION_1_1 = cpu_to_be32(0x06),
 450         CAP_VERSION_1_2 = cpu_to_be32(0x1A)
 451 };
 452
 453 enum tpm_sub_capabilities {
 454         TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
 455         TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
 456         TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
 457         TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
 458         TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
 459         TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
 460         TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
 461
 462 };
 463
 464 static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
 465                             int len, const char *desc)
 466 {
 467         int err;
 468
 469         len = tpm_transmit(chip,(u8 *) cmd, len);
 470         if (len <  0)
 471                 return len;
 472         if (len == TPM_ERROR_SIZE) {
 473                 err = be32_to_cpu(cmd->header.out.return_code);
 474                 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
 475                 return err;
 476         }
 477         return 0;
 478 }
 479
 480 #define TPM_INTERNAL_RESULT_SIZE 200
 481 #define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
 482 #define TPM_ORD_GET_CAP cpu_to_be32(101)
 483
 484 static const struct tpm_input_header tpm_getcap_header = {
 485         .tag = TPM_TAG_RQU_COMMAND,
 486         .length = cpu_to_be32(22),
 487         .ordinal = TPM_ORD_GET_CAP
 488 };
 489
 490 ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
 491                    const char *desc)
 492 {
 493         struct tpm_cmd_t tpm_cmd;
 494         int rc;
 495         struct tpm_chip *chip = dev_get_drvdata(dev);
 496
 497         tpm_cmd.header.in = tpm_getcap_header;
 498         if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {
 499                 tpm_cmd.params.getcap_in.cap = subcap_id;
 500                 /*subcap field not necessary */
 501                 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
 502                 tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
 503         } else {
 504                 if (subcap_id == TPM_CAP_FLAG_PERM ||
 505                     subcap_id == TPM_CAP_FLAG_VOL)
 506                         tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
 507                 else
 508                         tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
 509                 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 510                 tpm_cmd.params.getcap_in.subcap = subcap_id;
 511         }
 512         rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
 513         if (!rc)
 514                 *cap = tpm_cmd.params.getcap_out.cap;
 515         return rc;
 516 }
 517
 518 void tpm_gen_interrupt(struct tpm_chip *chip)
 519 {
 520         struct  tpm_cmd_t tpm_cmd;
 521         ssize_t rc;
 522
 523         tpm_cmd.header.in = tpm_getcap_header;
 524         tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
 525         tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 526         tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
 527
 528         rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
 529                         "attempting to determine the timeouts");
 530 }
 531 EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
 532
 533 void tpm_get_timeouts(struct tpm_chip *chip)
 534 {
 535         struct tpm_cmd_t tpm_cmd;
 536         unsigned long new_timeout[4];
 537         unsigned long old_timeout[4];
 538         struct duration_t *duration_cap;
 539         ssize_t rc;
 540
 541         tpm_cmd.header.in = tpm_getcap_header;
 542         tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
 543         tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 544         tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
 545
 546         rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
 547                         "attempting to determine the timeouts");
 548         if (rc)
 549                 goto duration;
 550
 551         if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
 552             be32_to_cpu(tpm_cmd.header.out.length)
 553             != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
 554                 return;
 555
 556         old_timeout[0] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.a);
 557         old_timeout[1] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.b);
 558         old_timeout[2] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.c);
 559         old_timeout[3] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.d);
 560         memcpy(new_timeout, old_timeout, sizeof(new_timeout));
 561
 562         /*
 563          * Provide ability for vendor overrides of timeout values in case
 564          * of misreporting.
 565          */
 566         if (chip->vendor.update_timeouts != NULL)
 567                 chip->vendor.timeout_adjusted =
 568                         chip->vendor.update_timeouts(chip, new_timeout);
 569
 570         if (!chip->vendor.timeout_adjusted) {
 571                 /* Don't overwrite default if value is 0 */
 572                 if (new_timeout[0] != 0 && new_timeout[0] < 1000) {
 573                         int i;
 574
 575                         /* timeouts in msec rather usec */
 576                         for (i = 0; i != ARRAY_SIZE(new_timeout); i++)
 577                                 new_timeout[i] *= 1000;
 578                         chip->vendor.timeout_adjusted = true;
 579                 }
 580         }
 581
 582         /* Report adjusted timeouts */
 583         if (chip->vendor.timeout_adjusted) {
 584                 dev_info(chip->dev,
 585                          HW_ERR "Adjusting reported timeouts: A %lu->%luus B %lu->%luus C %lu->%luus D %lu->%luus\n",
 586                          old_timeout[0], new_timeout[0],
 587                          old_timeout[1], new_timeout[1],
 588                          old_timeout[2], new_timeout[2],
 589                          old_timeout[3], new_timeout[3]);
 590         }
 591
 592         chip->vendor.timeout_a = usecs_to_jiffies(new_timeout[0]);
 593         chip->vendor.timeout_b = usecs_to_jiffies(new_timeout[1]);
 594         chip->vendor.timeout_c = usecs_to_jiffies(new_timeout[2]);
 595         chip->vendor.timeout_d = usecs_to_jiffies(new_timeout[3]);
 596
 597 duration:
 598         tpm_cmd.header.in = tpm_getcap_header;
 599         tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
 600         tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 601         tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
 602
 603         rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
 604                         "attempting to determine the durations");
 605         if (rc)
 606                 return;
 607
 608         if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
 609             be32_to_cpu(tpm_cmd.header.out.length)
 610             != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
 611                 return;
 612
 613         duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
 614         chip->vendor.duration[TPM_SHORT] =
 615             usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
 616         chip->vendor.duration[TPM_MEDIUM] =
 617             usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
 618         chip->vendor.duration[TPM_LONG] =
 619             usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
 620
 621         /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
 622          * value wrong and apparently reports msecs rather than usecs. So we
 623          * fix up the resulting too-small TPM_SHORT value to make things work.
 624          * We also scale the TPM_MEDIUM and -_LONG values by 1000.
 625          */
 626         if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) {
 627                 chip->vendor.duration[TPM_SHORT] = HZ;
 628                 chip->vendor.duration[TPM_MEDIUM] *= 1000;
 629                 chip->vendor.duration[TPM_LONG] *= 1000;
 630                 chip->vendor.duration_adjusted = true;
 631                 dev_info(chip->dev, "Adjusting TPM timeout parameters.");
 632         }
 633 }
 634 EXPORT_SYMBOL_GPL(tpm_get_timeouts);
 635
 636 void tpm_continue_selftest(struct tpm_chip *chip)
 637 {
 638         u8 data[] = {
 639                 0, 193,                 /* TPM_TAG_RQU_COMMAND */
 640                 0, 0, 0, 10,            /* length */
 641                 0, 0, 0, 83,            /* TPM_ORD_ContinueSelfTest */
 642         };
 643
 644         tpm_transmit(chip, data, sizeof(data));
 645 }
 646 EXPORT_SYMBOL_GPL(tpm_continue_selftest);
 647
 648 ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
 649                         char *buf)
 650 {
 651         cap_t cap;
 652         ssize_t rc;
 653
 654         rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
 655                          "attempting to determine the permanent enabled state");
 656         if (rc)
 657                 return 0;
 658
 659         rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
 660         return rc;
 661 }
 662 EXPORT_SYMBOL_GPL(tpm_show_enabled);
 663
 664 ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
 665                         char *buf)
 666 {
 667         cap_t cap;
 668         ssize_t rc;
 669
 670         rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
 671                          "attempting to determine the permanent active state");
 672         if (rc)
 673                 return 0;
 674
 675         rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
 676         return rc;
 677 }
 678 EXPORT_SYMBOL_GPL(tpm_show_active);
 679
 680 ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
 681                         char *buf)
 682 {
 683         cap_t cap;
 684         ssize_t rc;
 685
 686         rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
 687                          "attempting to determine the owner state");
 688         if (rc)
 689                 return 0;
 690
 691         rc = sprintf(buf, "%d\n", cap.owned);
 692         return rc;
 693 }
 694 EXPORT_SYMBOL_GPL(tpm_show_owned);
 695
 696 ssize_t tpm_show_temp_deactivated(struct device * dev,
 697                                 struct device_attribute * attr, char *buf)
 698 {
 699         cap_t cap;
 700         ssize_t rc;
 701
 702         rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
 703                          "attempting to determine the temporary state");
 704         if (rc)
 705                 return 0;
 706
 707         rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
 708         return rc;
 709 }
 710 EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
 711
 712 /*
 713  * tpm_chip_find_get - return tpm_chip for given chip number
 714  */
 715 static struct tpm_chip *tpm_chip_find_get(int chip_num)
 716 {
 717         struct tpm_chip *pos, *chip = NULL;
 718
 719         rcu_read_lock();
 720         list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
 721                 if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
 722                         continue;
 723
 724                 if (try_module_get(pos->dev->driver->owner)) {
 725                         chip = pos;
 726                         break;
 727                 }
 728         }
 729         rcu_read_unlock();
 730         return chip;
 731 }
 732
 733 #define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
 734 #define READ_PCR_RESULT_SIZE 30
 735 static struct tpm_input_header pcrread_header = {
 736         .tag = TPM_TAG_RQU_COMMAND,
 737         .length = cpu_to_be32(14),
 738         .ordinal = TPM_ORDINAL_PCRREAD
 739 };
 740
 741 int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
 742 {
 743         int rc;
 744         struct tpm_cmd_t cmd;
 745
 746         cmd.header.in = pcrread_header;
 747         cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
 748         rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
 749                           "attempting to read a pcr value");
 750
 751         if (rc == 0)
 752                 memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
 753                        TPM_DIGEST_SIZE);
 754         return rc;
 755 }
 756
 757 /**
 758  * tpm_pcr_read - read a pcr value
 759  * @chip_num:   tpm idx # or ANY
 760  * @pcr_idx:    pcr idx to retrieve
 761  * @res_buf:    TPM_PCR value
 762  *              size of res_buf is 20 bytes (or NULL if you don't care)
 763  *
 764  * The TPM driver should be built-in, but for whatever reason it
 765  * isn't, protect against the chip disappearing, by incrementing
 766  * the module usage count.
 767  */
 768 int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
 769 {
 770         struct tpm_chip *chip;
 771         int rc;
 772
 773         chip = tpm_chip_find_get(chip_num);
 774         if (chip == NULL)
 775                 return -ENODEV;
 776         rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
 777         tpm_chip_put(chip);
 778         return rc;
 779 }
 780 EXPORT_SYMBOL_GPL(tpm_pcr_read);
 781
 782 /**
 783  * tpm_pcr_extend - extend pcr value with hash
 784  * @chip_num:   tpm idx # or AN&
 785  * @pcr_idx:    pcr idx to extend
 786  * @hash:       hash value used to extend pcr value
 787  *
 788  * The TPM driver should be built-in, but for whatever reason it
 789  * isn't, protect against the chip disappearing, by incrementing
 790  * the module usage count.
 791  */
 792 #define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
 793 #define EXTEND_PCR_RESULT_SIZE 34
 794 static struct tpm_input_header pcrextend_header = {
 795         .tag = TPM_TAG_RQU_COMMAND,
 796         .length = cpu_to_be32(34),
 797         .ordinal = TPM_ORD_PCR_EXTEND
 798 };
 799
 800 int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
 801 {
 802         struct tpm_cmd_t cmd;
 803         int rc;
 804         struct tpm_chip *chip;
 805
 806         chip = tpm_chip_find_get(chip_num);
 807         if (chip == NULL)
 808                 return -ENODEV;
 809
 810         cmd.header.in = pcrextend_header;
 811         cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
 812         memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
 813         rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
 814                           "attempting extend a PCR value");
 815
 816         tpm_chip_put(chip);
 817         return rc;
 818 }
 819 EXPORT_SYMBOL_GPL(tpm_pcr_extend);
 820
 821 int tpm_send(u32 chip_num, void *cmd, size_t buflen)
 822 {
 823         struct tpm_chip *chip;
 824         int rc;
 825
 826         chip = tpm_chip_find_get(chip_num);
 827         if (chip == NULL)
 828                 return -ENODEV;
 829
 830         rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
 831
 832         tpm_chip_put(chip);
 833         return rc;
 834 }
 835 EXPORT_SYMBOL_GPL(tpm_send);
 836
 837 ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
 838                       char *buf)
 839 {
 840         cap_t cap;
 841         u8 digest[TPM_DIGEST_SIZE];
 842         ssize_t rc;
 843         int i, j, num_pcrs;
 844         char *str = buf;
 845         struct tpm_chip *chip = dev_get_drvdata(dev);
 846
 847         rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
 848                         "attempting to determine the number of PCRS");
 849         if (rc)
 850                 return 0;
 851
 852         num_pcrs = be32_to_cpu(cap.num_pcrs);
 853         for (i = 0; i < num_pcrs; i++) {
 854                 rc = __tpm_pcr_read(chip, i, digest);
 855                 if (rc)
 856                         break;
 857                 str += sprintf(str, "PCR-%02d: ", i);
 858                 for (j = 0; j < TPM_DIGEST_SIZE; j++)
 859                         str += sprintf(str, "%02X ", digest[j]);
 860                 str += sprintf(str, "\n");
 861         }
 862         return str - buf;
 863 }
 864 EXPORT_SYMBOL_GPL(tpm_show_pcrs);
 865
 866 #define  READ_PUBEK_RESULT_SIZE 314
 867 #define TPM_ORD_READPUBEK cpu_to_be32(124)
 868 struct tpm_input_header tpm_readpubek_header = {
 869         .tag = TPM_TAG_RQU_COMMAND,
 870         .length = cpu_to_be32(30),
 871         .ordinal = TPM_ORD_READPUBEK
 872 };
 873
 874 ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
 875                        char *buf)
 876 {
 877         u8 *data;
 878         struct tpm_cmd_t tpm_cmd;
 879         ssize_t err;
 880         int i, rc;
 881         char *str = buf;
 882         struct tpm_chip *chip = dev_get_drvdata(dev);
 883
 884         memset(&tpm_cmd, 0, sizeof(tpm_cmd));
 885
 886         tpm_cmd.header.in = tpm_readpubek_header;
 887         err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
 888                         "attempting to read the PUBEK");
 889         if (err)
 890                 goto out;
 891
 892         /*
 893            ignore header 10 bytes
 894            algorithm 32 bits (1 == RSA )
 895            encscheme 16 bits
 896            sigscheme 16 bits
 897            parameters (RSA 12->bytes: keybit, #primes, expbit)
 898            keylenbytes 32 bits
 899            256 byte modulus
 900            ignore checksum 20 bytes
 901          */
 902         data = tpm_cmd.params.readpubek_out_buffer;
 903         str +=
 904             sprintf(str,
 905                     "Algorithm: %02X %02X %02X %02X\n"
 906                     "Encscheme: %02X %02X\n"
 907                     "Sigscheme: %02X %02X\n"
 908                     "Parameters: %02X %02X %02X %02X "
 909                     "%02X %02X %02X %02X "
 910                     "%02X %02X %02X %02X\n"
 911                     "Modulus length: %d\n"
 912                     "Modulus:\n",
 913                     data[0], data[1], data[2], data[3],
 914                     data[4], data[5],
 915                     data[6], data[7],
 916                     data[12], data[13], data[14], data[15],
 917                     data[16], data[17], data[18], data[19],
 918                     data[20], data[21], data[22], data[23],
 919                     be32_to_cpu(*((__be32 *) (data + 24))));
 920
 921         for (i = 0; i < 256; i++) {
 922                 str += sprintf(str, "%02X ", data[i + 28]);
 923                 if ((i + 1) % 16 == 0)
 924                         str += sprintf(str, "\n");
 925         }
 926 out:
 927         rc = str - buf;
 928         return rc;
 929 }
 930 EXPORT_SYMBOL_GPL(tpm_show_pubek);
 931
 932
 933 ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
 934                       char *buf)
 935 {
 936         cap_t cap;
 937         ssize_t rc;
 938         char *str = buf;
 939
 940         rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
 941                         "attempting to determine the manufacturer");
 942         if (rc)
 943                 return 0;
 944         str += sprintf(str, "Manufacturer: 0x%x\n",
 945                        be32_to_cpu(cap.manufacturer_id));
 946
 947         rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
 948                         "attempting to determine the 1.1 version");
 949         if (rc)
 950                 return 0;
 951         str += sprintf(str,
 952                        "TCG version: %d.%d\nFirmware version: %d.%d\n",
 953                        cap.tpm_version.Major, cap.tpm_version.Minor,
 954                        cap.tpm_version.revMajor, cap.tpm_version.revMinor);
 955         return str - buf;
 956 }
 957 EXPORT_SYMBOL_GPL(tpm_show_caps);
 958
 959 ssize_t tpm_show_caps_1_2(struct device * dev,
 960                           struct device_attribute * attr, char *buf)
 961 {
 962         cap_t cap;
 963         ssize_t rc;
 964         char *str = buf;
 965
 966         rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
 967                         "attempting to determine the manufacturer");
 968         if (rc)
 969                 return 0;
 970         str += sprintf(str, "Manufacturer: 0x%x\n",
 971                        be32_to_cpu(cap.manufacturer_id));
 972         rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
 973                          "attempting to determine the 1.2 version");
 974         if (rc)
 975                 return 0;
 976         str += sprintf(str,
 977                        "TCG version: %d.%d\nFirmware version: %d.%d\n",
 978                        cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,
 979                        cap.tpm_version_1_2.revMajor,
 980                        cap.tpm_version_1_2.revMinor);
 981         return str - buf;
 982 }
 983 EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
 984
 985 ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
 986                           char *buf)
 987 {
 988         struct tpm_chip *chip = dev_get_drvdata(dev);
 989
 990         if (chip->vendor.duration[TPM_LONG] == 0)
 991                 return 0;
 992
 993         return sprintf(buf, "%d %d %d [%s]\n",
 994                        jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
 995                        jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
 996                        jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
 997                        chip->vendor.duration_adjusted
 998                        ? "adjusted" : "original");
 999 }
1000 EXPORT_SYMBOL_GPL(tpm_show_durations);
1001
1002 ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr,
1003                           char *buf)
1004 {
1005         struct tpm_chip *chip = dev_get_drvdata(dev);
1006
1007         return sprintf(buf, "%d %d %d %d [%s]\n",
1008                        jiffies_to_usecs(chip->vendor.timeout_a),
1009                        jiffies_to_usecs(chip->vendor.timeout_b),
1010                        jiffies_to_usecs(chip->vendor.timeout_c),
1011                        jiffies_to_usecs(chip->vendor.timeout_d),
1012                        chip->vendor.timeout_adjusted
1013                        ? "adjusted" : "original");
1014 }
1015 EXPORT_SYMBOL_GPL(tpm_show_timeouts);
1016
1017 ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
1018                         const char *buf, size_t count)
1019 {
1020         struct tpm_chip *chip = dev_get_drvdata(dev);
1021         if (chip == NULL)
1022                 return 0;
1023
1024         chip->vendor.cancel(chip);
1025         return count;
1026 }
1027 EXPORT_SYMBOL_GPL(tpm_store_cancel);
1028
1029 /*
1030  * Device file system interface to the TPM
1031  *
1032  * It's assured that the chip will be opened just once,
1033  * by the check of is_open variable, which is protected
1034  * by driver_lock.
1035  */
1036 int tpm_open(struct inode *inode, struct file *file)
1037 {
1038         int minor = iminor(inode);
1039         struct tpm_chip *chip = NULL, *pos;
1040
1041         rcu_read_lock();
1042         list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
1043                 if (pos->vendor.miscdev.minor == minor) {
1044                         chip = pos;
1045                         get_device(chip->dev);
1046                         break;
1047                 }
1048         }
1049         rcu_read_unlock();
1050
1051         if (!chip)
1052                 return -ENODEV;
1053
1054         if (test_and_set_bit(0, &chip->is_open)) {
1055                 dev_dbg(chip->dev, "Another process owns this TPM\n");
1056                 put_device(chip->dev);
1057                 return -EBUSY;
1058         }
1059
1060         chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
1061         if (chip->data_buffer == NULL) {
1062                 clear_bit(0, &chip->is_open);
1063                 put_device(chip->dev);
1064                 return -ENOMEM;
1065         }
1066
1067         atomic_set(&chip->data_pending, 0);
1068
1069         file->private_data = chip;
1070         return 0;
1071 }
1072 EXPORT_SYMBOL_GPL(tpm_open);
1073
1074 /*
1075  * Called on file close
1076  */
1077 int tpm_release(struct inode *inode, struct file *file)
1078 {
1079         struct tpm_chip *chip = file->private_data;
1080
1081         del_singleshot_timer_sync(&chip->user_read_timer);
1082         flush_work_sync(&chip->work);
1083         file->private_data = NULL;
1084         atomic_set(&chip->data_pending, 0);
1085         kfree(chip->data_buffer);
1086         clear_bit(0, &chip->is_open);
1087         put_device(chip->dev);
1088         return 0;
1089 }
1090 EXPORT_SYMBOL_GPL(tpm_release);
1091
1092 ssize_t tpm_write(struct file *file, const char __user *buf,
1093                   size_t size, loff_t *off)
1094 {
1095         struct tpm_chip *chip = file->private_data;
1096         size_t in_size = size;
1097         ssize_t out_size;
1098
1099         /* cannot perform a write until the read has cleared
1100            either via tpm_read or a user_read_timer timeout.
1101            This also prevents splitted buffered writes from blocking here.
1102         */
1103         if (atomic_read(&chip->data_pending) != 0)
1104                 return -EBUSY;
1105
1106         if (in_size > TPM_BUFSIZE)
1107                 return -E2BIG;
1108
1109         mutex_lock(&chip->buffer_mutex);
1110
1111         if (copy_from_user
1112             (chip->data_buffer, (void __user *) buf, in_size)) {
1113                 mutex_unlock(&chip->buffer_mutex);
1114                 return -EFAULT;
1115         }
1116
1117         if (in_size < 6 ||
1118             in_size < be32_to_cpu(*((__be32 *) (chip->data_buffer + 2)))) {
1119                 mutex_unlock(&chip->buffer_mutex);
1120                 return -EINVAL;
1121         }
1122
1123         /* atomic tpm command send and result receive */
1124         out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1125         if (out_size < 0) {
1126                 mutex_unlock(&chip->buffer_mutex);
1127                 return out_size;
1128         }
1129
1130         atomic_set(&chip->data_pending, out_size);
1131         mutex_unlock(&chip->buffer_mutex);
1132
1133         /* Set a timeout by which the reader must come claim the result */
1134         mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1135
1136         return in_size;
1137 }
1138 EXPORT_SYMBOL_GPL(tpm_write);
1139
1140 ssize_t tpm_read(struct file *file, char __user *buf,
1141                  size_t size, loff_t *off)
1142 {
1143         struct tpm_chip *chip = file->private_data;
1144         ssize_t ret_size;
1145         int rc;
1146
1147         del_singleshot_timer_sync(&chip->user_read_timer);
1148         flush_work_sync(&chip->work);
1149         ret_size = atomic_read(&chip->data_pending);
1150         atomic_set(&chip->data_pending, 0);
1151         if (ret_size > 0) {     /* relay data */
1152                 ssize_t orig_ret_size = ret_size;
1153                 if (size < ret_size)
1154                         ret_size = size;
1155
1156                 mutex_lock(&chip->buffer_mutex);
1157                 rc = copy_to_user(buf, chip->data_buffer, ret_size);
1158                 memset(chip->data_buffer, 0, orig_ret_size);
1159                 if (rc)
1160                         ret_size = -EFAULT;
1161
1162                 mutex_unlock(&chip->buffer_mutex);
1163         }
1164
1165         return ret_size;
1166 }
1167 EXPORT_SYMBOL_GPL(tpm_read);
1168
1169 void tpm_remove_hardware(struct device *dev)
1170 {
1171         struct tpm_chip *chip = dev_get_drvdata(dev);
1172
1173         if (chip == NULL) {
1174                 dev_err(dev, "No device data found\n");
1175                 return;
1176         }
1177
1178         spin_lock(&driver_lock);
1179         list_del_rcu(&chip->list);
1180         spin_unlock(&driver_lock);
1181         synchronize_rcu();
1182
1183         misc_deregister(&chip->vendor.miscdev);
1184         sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
1185         tpm_bios_log_teardown(chip->bios_dir);
1186
1187         /* write it this way to be explicit (chip->dev == dev) */
1188         put_device(chip->dev);
1189 }
1190 EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1191
1192 #define TPM_ORD_SAVESTATE cpu_to_be32(152)
1193 #define SAVESTATE_RESULT_SIZE 10
1194
1195 static struct tpm_input_header savestate_header = {
1196         .tag = TPM_TAG_RQU_COMMAND,
1197         .length = cpu_to_be32(10),
1198         .ordinal = TPM_ORD_SAVESTATE
1199 };
1200
1201 /*
1202  * We are about to suspend. Save the TPM state
1203  * so that it can be restored.
1204  */
1205 int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1206 {
1207         struct tpm_chip *chip = dev_get_drvdata(dev);
1208         struct tpm_cmd_t cmd;
1209         int rc;
1210
1211         u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
1212
1213         if (chip == NULL)
1214                 return -ENODEV;
1215
1216         /* for buggy tpm, flush pcrs with extend to selected dummy */
1217         if (tpm_suspend_pcr) {
1218                 cmd.header.in = pcrextend_header;
1219                 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
1220                 memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
1221                        TPM_DIGEST_SIZE);
1222                 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
1223                                   "extending dummy pcr before suspend");
1224         }
1225
1226         /* now do the actual savestate */
1227         cmd.header.in = savestate_header;
1228         rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE,
1229                           "sending savestate before suspend");
1230         return rc;
1231 }
1232 EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1233
1234 /*
1235  * Resume from a power safe. The BIOS already restored
1236  * the TPM state.
1237  */
1238 int tpm_pm_resume(struct device *dev)
1239 {
1240         struct tpm_chip *chip = dev_get_drvdata(dev);
1241
1242         if (chip == NULL)
1243                 return -ENODEV;
1244
1245         return 0;
1246 }
1247 EXPORT_SYMBOL_GPL(tpm_pm_resume);
1248
1249 /* In case vendor provided release function, call it too.*/
1250
1251 void tpm_dev_vendor_release(struct tpm_chip *chip)
1252 {
1253         if (chip->vendor.release)
1254                 chip->vendor.release(chip->dev);
1255
1256         clear_bit(chip->dev_num, dev_mask);
1257         kfree(chip->vendor.miscdev.name);
1258 }
1259 EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1260
1261
1262 /*
1263  * Once all references to platform device are down to 0,
1264  * release all allocated structures.
1265  */
1266 void tpm_dev_release(struct device *dev)
1267 {
1268         struct tpm_chip *chip = dev_get_drvdata(dev);
1269
1270         tpm_dev_vendor_release(chip);
1271
1272         chip->release(dev);
1273         kfree(chip);
1274 }
1275 EXPORT_SYMBOL_GPL(tpm_dev_release);
1276
1277 /*
1278  * Called from tpm_<specific>.c probe function only for devices
1279  * the driver has determined it should claim.  Prior to calling
1280  * this function the specific probe function has called pci_enable_device
1281  * upon errant exit from this function specific probe function should call
1282  * pci_disable_device
1283  */
1284 struct tpm_chip *tpm_register_hardware(struct device *dev,
1285                                         const struct tpm_vendor_specific *entry)
1286 {
1287 #define DEVNAME_SIZE 7
1288
1289         char *devname;
1290         struct tpm_chip *chip;
1291
1292         /* Driver specific per-device data */
1293         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1294         devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1295
1296         if (chip == NULL || devname == NULL)
1297                 goto out_free;
1298
1299         mutex_init(&chip->buffer_mutex);
1300         mutex_init(&chip->tpm_mutex);
1301         INIT_LIST_HEAD(&chip->list);
1302
1303         INIT_WORK(&chip->work, timeout_work);
1304
1305         setup_timer(&chip->user_read_timer, user_reader_timeout,
1306                         (unsigned long)chip);
1307
1308         memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1309
1310         chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1311
1312         if (chip->dev_num >= TPM_NUM_DEVICES) {
1313                 dev_err(dev, "No available tpm device numbers\n");
1314                 goto out_free;
1315         } else if (chip->dev_num == 0)
1316                 chip->vendor.miscdev.minor = TPM_MINOR;
1317         else
1318                 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1319
1320         set_bit(chip->dev_num, dev_mask);
1321
1322         scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
1323         chip->vendor.miscdev.name = devname;
1324
1325         chip->vendor.miscdev.parent = dev;
1326         chip->dev = get_device(dev);
1327         chip->release = dev->release;
1328         dev->release = tpm_dev_release;
1329         dev_set_drvdata(dev, chip);
1330
1331         if (misc_register(&chip->vendor.miscdev)) {
1332                 dev_err(chip->dev,
1333                         "unable to misc_register %s, minor %d\n",
1334                         chip->vendor.miscdev.name,
1335                         chip->vendor.miscdev.minor);
1336                 put_device(chip->dev);
1337                 return NULL;
1338         }
1339
1340         if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
1341                 misc_deregister(&chip->vendor.miscdev);
1342                 put_device(chip->dev);
1343
1344                 return NULL;
1345         }
1346
1347         chip->bios_dir = tpm_bios_log_setup(devname);
1348
1349         /* Make chip available */
1350         spin_lock(&driver_lock);
1351         list_add_tail_rcu(&chip->list, &tpm_chip_list);
1352         spin_unlock(&driver_lock);
1353
1354         return chip;
1355
1356 out_free:
1357         kfree(chip);
1358         kfree(devname);
1359         return NULL;
1360 }
1361 EXPORT_SYMBOL_GPL(tpm_register_hardware);
1362
1363 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1364 MODULE_DESCRIPTION("TPM Driver");
1365 MODULE_VERSION("2.0");
1366 MODULE_LICENSE("GPL");