1 /* 2 * Copyright (C) 2004 IBM Corporation 3 * Copyright (C) 2014 Intel Corporation 4 * 5 * Authors: 6 * Leendert van Doorn <leendert@watson.ibm.com> 7 * Dave Safford <safford@watson.ibm.com> 8 * Reiner Sailer <sailer@watson.ibm.com> 9 * Kylene Hall <kjhall@us.ibm.com> 10 * 11 * Maintained by: <tpmdd-devel@lists.sourceforge.net> 12 * 13 * Device driver for TCG/TCPA TPM (trusted platform module). 14 * Specifications at www.trustedcomputinggroup.org 15 * 16 * This program is free software; you can redistribute it and/or 17 * modify it under the terms of the GNU General Public License as 18 * published by the Free Software Foundation, version 2 of the 19 * License. 20 * 21 * Note, the TPM chip is not interrupt driven (only polling) 22 * and can have very long timeouts (minutes!). Hence the unusual 23 * calls to msleep. 24 * 25 */ 26 27 #include <linux/poll.h> 28 #include <linux/slab.h> 29 #include <linux/mutex.h> 30 #include <linux/spinlock.h> 31 #include <linux/freezer.h> 32 #include <linux/pm_runtime.h> 33 34 #include "tpm.h" 35 #include "tpm_eventlog.h" 36 37 #define TPM_MAX_ORDINAL 243 38 #define TSC_MAX_ORDINAL 12 39 #define TPM_PROTECTED_COMMAND 0x00 40 #define TPM_CONNECTION_COMMAND 0x40 41 42 /* 43 * Bug workaround - some TPM's don't flush the most 44 * recently changed pcr on suspend, so force the flush 45 * with an extend to the selected _unused_ non-volatile pcr. 46 */ 47 static int tpm_suspend_pcr; 48 module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644); 49 MODULE_PARM_DESC(suspend_pcr, 50 "PCR to use for dummy writes to facilitate flush on suspend."); 51 52 /* 53 * Array with one entry per ordinal defining the maximum amount 54 * of time the chip could take to return the result. The ordinal 55 * designation of short, medium or long is defined in a table in 56 * TCG Specification TPM Main Part 2 TPM Structures Section 17. The 57 * values of the SHORT, MEDIUM, and LONG durations are retrieved 58 * from the chip during initialization with a call to tpm_get_timeouts. 59 */ 60 static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = { 61 TPM_UNDEFINED, /* 0 */ 62 TPM_UNDEFINED, 63 TPM_UNDEFINED, 64 TPM_UNDEFINED, 65 TPM_UNDEFINED, 66 TPM_UNDEFINED, /* 5 */ 67 TPM_UNDEFINED, 68 TPM_UNDEFINED, 69 TPM_UNDEFINED, 70 TPM_UNDEFINED, 71 TPM_SHORT, /* 10 */ 72 TPM_SHORT, 73 TPM_MEDIUM, 74 TPM_LONG, 75 TPM_LONG, 76 TPM_MEDIUM, /* 15 */ 77 TPM_SHORT, 78 TPM_SHORT, 79 TPM_MEDIUM, 80 TPM_LONG, 81 TPM_SHORT, /* 20 */ 82 TPM_SHORT, 83 TPM_MEDIUM, 84 TPM_MEDIUM, 85 TPM_MEDIUM, 86 TPM_SHORT, /* 25 */ 87 TPM_SHORT, 88 TPM_MEDIUM, 89 TPM_SHORT, 90 TPM_SHORT, 91 TPM_MEDIUM, /* 30 */ 92 TPM_LONG, 93 TPM_MEDIUM, 94 TPM_SHORT, 95 TPM_SHORT, 96 TPM_SHORT, /* 35 */ 97 TPM_MEDIUM, 98 TPM_MEDIUM, 99 TPM_UNDEFINED, 100 TPM_UNDEFINED, 101 TPM_MEDIUM, /* 40 */ 102 TPM_LONG, 103 TPM_MEDIUM, 104 TPM_SHORT, 105 TPM_SHORT, 106 TPM_SHORT, /* 45 */ 107 TPM_SHORT, 108 TPM_SHORT, 109 TPM_SHORT, 110 TPM_LONG, 111 TPM_MEDIUM, /* 50 */ 112 TPM_MEDIUM, 113 TPM_UNDEFINED, 114 TPM_UNDEFINED, 115 TPM_UNDEFINED, 116 TPM_UNDEFINED, /* 55 */ 117 TPM_UNDEFINED, 118 TPM_UNDEFINED, 119 TPM_UNDEFINED, 120 TPM_UNDEFINED, 121 TPM_MEDIUM, /* 60 */ 122 TPM_MEDIUM, 123 TPM_MEDIUM, 124 TPM_SHORT, 125 TPM_SHORT, 126 TPM_MEDIUM, /* 65 */ 127 TPM_UNDEFINED, 128 TPM_UNDEFINED, 129 TPM_UNDEFINED, 130 TPM_UNDEFINED, 131 TPM_SHORT, /* 70 */ 132 TPM_SHORT, 133 TPM_UNDEFINED, 134 TPM_UNDEFINED, 135 TPM_UNDEFINED, 136 TPM_UNDEFINED, /* 75 */ 137 TPM_UNDEFINED, 138 TPM_UNDEFINED, 139 TPM_UNDEFINED, 140 TPM_UNDEFINED, 141 TPM_LONG, /* 80 */ 142 TPM_UNDEFINED, 143 TPM_MEDIUM, 144 TPM_LONG, 145 TPM_SHORT, 146 TPM_UNDEFINED, /* 85 */ 147 TPM_UNDEFINED, 148 TPM_UNDEFINED, 149 TPM_UNDEFINED, 150 TPM_UNDEFINED, 151 TPM_SHORT, /* 90 */ 152 TPM_SHORT, 153 TPM_SHORT, 154 TPM_SHORT, 155 TPM_SHORT, 156 TPM_UNDEFINED, /* 95 */ 157 TPM_UNDEFINED, 158 TPM_UNDEFINED, 159 TPM_UNDEFINED, 160 TPM_UNDEFINED, 161 TPM_MEDIUM, /* 100 */ 162 TPM_SHORT, 163 TPM_SHORT, 164 TPM_UNDEFINED, 165 TPM_UNDEFINED, 166 TPM_UNDEFINED, /* 105 */ 167 TPM_UNDEFINED, 168 TPM_UNDEFINED, 169 TPM_UNDEFINED, 170 TPM_UNDEFINED, 171 TPM_SHORT, /* 110 */ 172 TPM_SHORT, 173 TPM_SHORT, 174 TPM_SHORT, 175 TPM_SHORT, 176 TPM_SHORT, /* 115 */ 177 TPM_SHORT, 178 TPM_SHORT, 179 TPM_UNDEFINED, 180 TPM_UNDEFINED, 181 TPM_LONG, /* 120 */ 182 TPM_LONG, 183 TPM_MEDIUM, 184 TPM_UNDEFINED, 185 TPM_SHORT, 186 TPM_SHORT, /* 125 */ 187 TPM_SHORT, 188 TPM_LONG, 189 TPM_SHORT, 190 TPM_SHORT, 191 TPM_SHORT, /* 130 */ 192 TPM_MEDIUM, 193 TPM_UNDEFINED, 194 TPM_SHORT, 195 TPM_MEDIUM, 196 TPM_UNDEFINED, /* 135 */ 197 TPM_UNDEFINED, 198 TPM_UNDEFINED, 199 TPM_UNDEFINED, 200 TPM_UNDEFINED, 201 TPM_SHORT, /* 140 */ 202 TPM_SHORT, 203 TPM_UNDEFINED, 204 TPM_UNDEFINED, 205 TPM_UNDEFINED, 206 TPM_UNDEFINED, /* 145 */ 207 TPM_UNDEFINED, 208 TPM_UNDEFINED, 209 TPM_UNDEFINED, 210 TPM_UNDEFINED, 211 TPM_SHORT, /* 150 */ 212 TPM_MEDIUM, 213 TPM_MEDIUM, 214 TPM_SHORT, 215 TPM_SHORT, 216 TPM_UNDEFINED, /* 155 */ 217 TPM_UNDEFINED, 218 TPM_UNDEFINED, 219 TPM_UNDEFINED, 220 TPM_UNDEFINED, 221 TPM_SHORT, /* 160 */ 222 TPM_SHORT, 223 TPM_SHORT, 224 TPM_SHORT, 225 TPM_UNDEFINED, 226 TPM_UNDEFINED, /* 165 */ 227 TPM_UNDEFINED, 228 TPM_UNDEFINED, 229 TPM_UNDEFINED, 230 TPM_UNDEFINED, 231 TPM_LONG, /* 170 */ 232 TPM_UNDEFINED, 233 TPM_UNDEFINED, 234 TPM_UNDEFINED, 235 TPM_UNDEFINED, 236 TPM_UNDEFINED, /* 175 */ 237 TPM_UNDEFINED, 238 TPM_UNDEFINED, 239 TPM_UNDEFINED, 240 TPM_UNDEFINED, 241 TPM_MEDIUM, /* 180 */ 242 TPM_SHORT, 243 TPM_MEDIUM, 244 TPM_MEDIUM, 245 TPM_MEDIUM, 246 TPM_MEDIUM, /* 185 */ 247 TPM_SHORT, 248 TPM_UNDEFINED, 249 TPM_UNDEFINED, 250 TPM_UNDEFINED, 251 TPM_UNDEFINED, /* 190 */ 252 TPM_UNDEFINED, 253 TPM_UNDEFINED, 254 TPM_UNDEFINED, 255 TPM_UNDEFINED, 256 TPM_UNDEFINED, /* 195 */ 257 TPM_UNDEFINED, 258 TPM_UNDEFINED, 259 TPM_UNDEFINED, 260 TPM_UNDEFINED, 261 TPM_SHORT, /* 200 */ 262 TPM_UNDEFINED, 263 TPM_UNDEFINED, 264 TPM_UNDEFINED, 265 TPM_SHORT, 266 TPM_SHORT, /* 205 */ 267 TPM_SHORT, 268 TPM_SHORT, 269 TPM_SHORT, 270 TPM_SHORT, 271 TPM_MEDIUM, /* 210 */ 272 TPM_UNDEFINED, 273 TPM_MEDIUM, 274 TPM_MEDIUM, 275 TPM_MEDIUM, 276 TPM_UNDEFINED, /* 215 */ 277 TPM_MEDIUM, 278 TPM_UNDEFINED, 279 TPM_UNDEFINED, 280 TPM_SHORT, 281 TPM_SHORT, /* 220 */ 282 TPM_SHORT, 283 TPM_SHORT, 284 TPM_SHORT, 285 TPM_SHORT, 286 TPM_UNDEFINED, /* 225 */ 287 TPM_UNDEFINED, 288 TPM_UNDEFINED, 289 TPM_UNDEFINED, 290 TPM_UNDEFINED, 291 TPM_SHORT, /* 230 */ 292 TPM_LONG, 293 TPM_MEDIUM, 294 TPM_UNDEFINED, 295 TPM_UNDEFINED, 296 TPM_UNDEFINED, /* 235 */ 297 TPM_UNDEFINED, 298 TPM_UNDEFINED, 299 TPM_UNDEFINED, 300 TPM_UNDEFINED, 301 TPM_SHORT, /* 240 */ 302 TPM_UNDEFINED, 303 TPM_MEDIUM, 304 }; 305 306 /* 307 * Returns max number of jiffies to wait 308 */ 309 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, 310 u32 ordinal) 311 { 312 int duration_idx = TPM_UNDEFINED; 313 int duration = 0; 314 315 /* 316 * We only have a duration table for protected commands, where the upper 317 * 16 bits are 0. For the few other ordinals the fallback will be used. 318 */ 319 if (ordinal < TPM_MAX_ORDINAL) 320 duration_idx = tpm_ordinal_duration[ordinal]; 321 322 if (duration_idx != TPM_UNDEFINED) 323 duration = chip->duration[duration_idx]; 324 if (duration <= 0) 325 return 2 * 60 * HZ; 326 else 327 return duration; 328 } 329 EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration); 330 331 static bool tpm_validate_command(struct tpm_chip *chip, 332 struct tpm_space *space, 333 const u8 *cmd, 334 size_t len) 335 { 336 const struct tpm_input_header *header = (const void *)cmd; 337 int i; 338 u32 cc; 339 u32 attrs; 340 unsigned int nr_handles; 341 342 if (len < TPM_HEADER_SIZE) 343 return false; 344 345 if (!space) 346 return true; 347 348 if (chip->flags & TPM_CHIP_FLAG_TPM2 && chip->nr_commands) { 349 cc = be32_to_cpu(header->ordinal); 350 351 i = tpm2_find_cc(chip, cc); 352 if (i < 0) { 353 dev_dbg(&chip->dev, "0x%04X is an invalid command\n", 354 cc); 355 return false; 356 } 357 358 attrs = chip->cc_attrs_tbl[i]; 359 nr_handles = 360 4 * ((attrs >> TPM2_CC_ATTR_CHANDLES) & GENMASK(2, 0)); 361 if (len < TPM_HEADER_SIZE + 4 * nr_handles) 362 goto err_len; 363 } 364 365 return true; 366 err_len: 367 dev_dbg(&chip->dev, 368 "%s: insufficient command length %zu", __func__, len); 369 return false; 370 } 371 372 /** 373 * tmp_transmit - Internal kernel interface to transmit TPM commands. 374 * 375 * @chip: TPM chip to use 376 * @buf: TPM command buffer 377 * @bufsiz: length of the TPM command buffer 378 * @flags: tpm transmit flags - bitmap 379 * 380 * Return: 381 * 0 when the operation is successful. 382 * A negative number for system errors (errno). 383 */ 384 ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space, 385 u8 *buf, size_t bufsiz, unsigned int flags) 386 { 387 struct tpm_output_header *header = (void *)buf; 388 int rc; 389 ssize_t len = 0; 390 u32 count, ordinal; 391 unsigned long stop; 392 bool need_locality; 393 394 if (!tpm_validate_command(chip, space, buf, bufsiz)) 395 return -EINVAL; 396 397 if (bufsiz > TPM_BUFSIZE) 398 bufsiz = TPM_BUFSIZE; 399 400 count = be32_to_cpu(*((__be32 *) (buf + 2))); 401 ordinal = be32_to_cpu(*((__be32 *) (buf + 6))); 402 if (count == 0) 403 return -ENODATA; 404 if (count > bufsiz) { 405 dev_err(&chip->dev, 406 "invalid count value %x %zx\n", count, bufsiz); 407 return -E2BIG; 408 } 409 410 if (!(flags & TPM_TRANSMIT_UNLOCKED)) 411 mutex_lock(&chip->tpm_mutex); 412 413 if (chip->dev.parent) 414 pm_runtime_get_sync(chip->dev.parent); 415 416 /* Store the decision as chip->locality will be changed. */ 417 need_locality = chip->locality == -1; 418 419 if (need_locality && chip->ops->request_locality) { 420 rc = chip->ops->request_locality(chip, 0); 421 if (rc < 0) 422 goto out_no_locality; 423 chip->locality = rc; 424 } 425 426 rc = tpm2_prepare_space(chip, space, ordinal, buf); 427 if (rc) 428 goto out; 429 430 rc = chip->ops->send(chip, (u8 *) buf, count); 431 if (rc < 0) { 432 dev_err(&chip->dev, 433 "tpm_transmit: tpm_send: error %d\n", rc); 434 goto out; 435 } 436 437 if (chip->flags & TPM_CHIP_FLAG_IRQ) 438 goto out_recv; 439 440 if (chip->flags & TPM_CHIP_FLAG_TPM2) 441 stop = jiffies + tpm2_calc_ordinal_duration(chip, ordinal); 442 else 443 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal); 444 do { 445 u8 status = chip->ops->status(chip); 446 if ((status & chip->ops->req_complete_mask) == 447 chip->ops->req_complete_val) 448 goto out_recv; 449 450 if (chip->ops->req_canceled(chip, status)) { 451 dev_err(&chip->dev, "Operation Canceled\n"); 452 rc = -ECANCELED; 453 goto out; 454 } 455 456 msleep(TPM_TIMEOUT); /* CHECK */ 457 rmb(); 458 } while (time_before(jiffies, stop)); 459 460 chip->ops->cancel(chip); 461 dev_err(&chip->dev, "Operation Timed out\n"); 462 rc = -ETIME; 463 goto out; 464 465 out_recv: 466 len = chip->ops->recv(chip, (u8 *) buf, bufsiz); 467 if (len < 0) { 468 rc = len; 469 dev_err(&chip->dev, 470 "tpm_transmit: tpm_recv: error %d\n", rc); 471 goto out; 472 } else if (len < TPM_HEADER_SIZE) { 473 rc = -EFAULT; 474 goto out; 475 } 476 477 if (len != be32_to_cpu(header->length)) { 478 rc = -EFAULT; 479 goto out; 480 } 481 482 rc = tpm2_commit_space(chip, space, ordinal, buf, &len); 483 484 out: 485 if (need_locality && chip->ops->relinquish_locality) { 486 chip->ops->relinquish_locality(chip, chip->locality); 487 chip->locality = -1; 488 } 489 out_no_locality: 490 if (chip->dev.parent) 491 pm_runtime_put_sync(chip->dev.parent); 492 493 if (!(flags & TPM_TRANSMIT_UNLOCKED)) 494 mutex_unlock(&chip->tpm_mutex); 495 return rc ? rc : len; 496 } 497 498 /** 499 * tmp_transmit_cmd - send a tpm command to the device 500 * The function extracts tpm out header return code 501 * 502 * @chip: TPM chip to use 503 * @buf: TPM command buffer 504 * @bufsiz: length of the buffer 505 * @min_rsp_body_length: minimum expected length of response body 506 * @flags: tpm transmit flags - bitmap 507 * @desc: command description used in the error message 508 * 509 * Return: 510 * 0 when the operation is successful. 511 * A negative number for system errors (errno). 512 * A positive number for a TPM error. 513 */ 514 ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space, 515 const void *buf, size_t bufsiz, 516 size_t min_rsp_body_length, unsigned int flags, 517 const char *desc) 518 { 519 const struct tpm_output_header *header = buf; 520 int err; 521 ssize_t len; 522 523 len = tpm_transmit(chip, space, (u8 *)buf, bufsiz, flags); 524 if (len < 0) 525 return len; 526 527 err = be32_to_cpu(header->return_code); 528 if (err != 0 && desc) 529 dev_err(&chip->dev, "A TPM error (%d) occurred %s\n", err, 530 desc); 531 if (err) 532 return err; 533 534 if (len < min_rsp_body_length + TPM_HEADER_SIZE) 535 return -EFAULT; 536 537 return 0; 538 } 539 540 #define TPM_DIGEST_SIZE 20 541 #define TPM_RET_CODE_IDX 6 542 #define TPM_INTERNAL_RESULT_SIZE 200 543 #define TPM_ORD_GET_CAP cpu_to_be32(101) 544 #define TPM_ORD_GET_RANDOM cpu_to_be32(70) 545 546 static const struct tpm_input_header tpm_getcap_header = { 547 .tag = TPM_TAG_RQU_COMMAND, 548 .length = cpu_to_be32(22), 549 .ordinal = TPM_ORD_GET_CAP 550 }; 551 552 ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap, 553 const char *desc, size_t min_cap_length) 554 { 555 struct tpm_cmd_t tpm_cmd; 556 int rc; 557 558 tpm_cmd.header.in = tpm_getcap_header; 559 if (subcap_id == TPM_CAP_VERSION_1_1 || 560 subcap_id == TPM_CAP_VERSION_1_2) { 561 tpm_cmd.params.getcap_in.cap = cpu_to_be32(subcap_id); 562 /*subcap field not necessary */ 563 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0); 564 tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32)); 565 } else { 566 if (subcap_id == TPM_CAP_FLAG_PERM || 567 subcap_id == TPM_CAP_FLAG_VOL) 568 tpm_cmd.params.getcap_in.cap = 569 cpu_to_be32(TPM_CAP_FLAG); 570 else 571 tpm_cmd.params.getcap_in.cap = 572 cpu_to_be32(TPM_CAP_PROP); 573 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4); 574 tpm_cmd.params.getcap_in.subcap = cpu_to_be32(subcap_id); 575 } 576 rc = tpm_transmit_cmd(chip, NULL, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, 577 min_cap_length, 0, desc); 578 if (!rc) 579 *cap = tpm_cmd.params.getcap_out.cap; 580 return rc; 581 } 582 EXPORT_SYMBOL_GPL(tpm_getcap); 583 584 #define TPM_ORD_STARTUP cpu_to_be32(153) 585 #define TPM_ST_CLEAR cpu_to_be16(1) 586 #define TPM_ST_STATE cpu_to_be16(2) 587 #define TPM_ST_DEACTIVATED cpu_to_be16(3) 588 static const struct tpm_input_header tpm_startup_header = { 589 .tag = TPM_TAG_RQU_COMMAND, 590 .length = cpu_to_be32(12), 591 .ordinal = TPM_ORD_STARTUP 592 }; 593 594 static int tpm_startup(struct tpm_chip *chip, __be16 startup_type) 595 { 596 struct tpm_cmd_t start_cmd; 597 start_cmd.header.in = tpm_startup_header; 598 599 start_cmd.params.startup_in.startup_type = startup_type; 600 return tpm_transmit_cmd(chip, NULL, &start_cmd, 601 TPM_INTERNAL_RESULT_SIZE, 0, 602 0, "attempting to start the TPM"); 603 } 604 605 int tpm_get_timeouts(struct tpm_chip *chip) 606 { 607 cap_t cap; 608 unsigned long timeout_old[4], timeout_chip[4], timeout_eff[4]; 609 ssize_t rc; 610 611 if (chip->flags & TPM_CHIP_FLAG_HAVE_TIMEOUTS) 612 return 0; 613 614 if (chip->flags & TPM_CHIP_FLAG_TPM2) { 615 /* Fixed timeouts for TPM2 */ 616 chip->timeout_a = msecs_to_jiffies(TPM2_TIMEOUT_A); 617 chip->timeout_b = msecs_to_jiffies(TPM2_TIMEOUT_B); 618 chip->timeout_c = msecs_to_jiffies(TPM2_TIMEOUT_C); 619 chip->timeout_d = msecs_to_jiffies(TPM2_TIMEOUT_D); 620 chip->duration[TPM_SHORT] = 621 msecs_to_jiffies(TPM2_DURATION_SHORT); 622 chip->duration[TPM_MEDIUM] = 623 msecs_to_jiffies(TPM2_DURATION_MEDIUM); 624 chip->duration[TPM_LONG] = 625 msecs_to_jiffies(TPM2_DURATION_LONG); 626 627 chip->flags |= TPM_CHIP_FLAG_HAVE_TIMEOUTS; 628 return 0; 629 } 630 631 rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, NULL, 632 sizeof(cap.timeout)); 633 if (rc == TPM_ERR_INVALID_POSTINIT) { 634 /* The TPM is not started, we are the first to talk to it. 635 Execute a startup command. */ 636 dev_info(&chip->dev, "Issuing TPM_STARTUP\n"); 637 if (tpm_startup(chip, TPM_ST_CLEAR)) 638 return rc; 639 640 rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, 641 "attempting to determine the timeouts", 642 sizeof(cap.timeout)); 643 } 644 645 if (rc) { 646 dev_err(&chip->dev, 647 "A TPM error (%zd) occurred attempting to determine the timeouts\n", 648 rc); 649 return rc; 650 } 651 652 timeout_old[0] = jiffies_to_usecs(chip->timeout_a); 653 timeout_old[1] = jiffies_to_usecs(chip->timeout_b); 654 timeout_old[2] = jiffies_to_usecs(chip->timeout_c); 655 timeout_old[3] = jiffies_to_usecs(chip->timeout_d); 656 timeout_chip[0] = be32_to_cpu(cap.timeout.a); 657 timeout_chip[1] = be32_to_cpu(cap.timeout.b); 658 timeout_chip[2] = be32_to_cpu(cap.timeout.c); 659 timeout_chip[3] = be32_to_cpu(cap.timeout.d); 660 memcpy(timeout_eff, timeout_chip, sizeof(timeout_eff)); 661 662 /* 663 * Provide ability for vendor overrides of timeout values in case 664 * of misreporting. 665 */ 666 if (chip->ops->update_timeouts != NULL) 667 chip->timeout_adjusted = 668 chip->ops->update_timeouts(chip, timeout_eff); 669 670 if (!chip->timeout_adjusted) { 671 /* Restore default if chip reported 0 */ 672 int i; 673 674 for (i = 0; i < ARRAY_SIZE(timeout_eff); i++) { 675 if (timeout_eff[i]) 676 continue; 677 678 timeout_eff[i] = timeout_old[i]; 679 chip->timeout_adjusted = true; 680 } 681 682 if (timeout_eff[0] != 0 && timeout_eff[0] < 1000) { 683 /* timeouts in msec rather usec */ 684 for (i = 0; i != ARRAY_SIZE(timeout_eff); i++) 685 timeout_eff[i] *= 1000; 686 chip->timeout_adjusted = true; 687 } 688 } 689 690 /* Report adjusted timeouts */ 691 if (chip->timeout_adjusted) { 692 dev_info(&chip->dev, 693 HW_ERR "Adjusting reported timeouts: A %lu->%luus B %lu->%luus C %lu->%luus D %lu->%luus\n", 694 timeout_chip[0], timeout_eff[0], 695 timeout_chip[1], timeout_eff[1], 696 timeout_chip[2], timeout_eff[2], 697 timeout_chip[3], timeout_eff[3]); 698 } 699 700 chip->timeout_a = usecs_to_jiffies(timeout_eff[0]); 701 chip->timeout_b = usecs_to_jiffies(timeout_eff[1]); 702 chip->timeout_c = usecs_to_jiffies(timeout_eff[2]); 703 chip->timeout_d = usecs_to_jiffies(timeout_eff[3]); 704 705 rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_DURATION, &cap, 706 "attempting to determine the durations", 707 sizeof(cap.duration)); 708 if (rc) 709 return rc; 710 711 chip->duration[TPM_SHORT] = 712 usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_short)); 713 chip->duration[TPM_MEDIUM] = 714 usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_medium)); 715 chip->duration[TPM_LONG] = 716 usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_long)); 717 718 /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above 719 * value wrong and apparently reports msecs rather than usecs. So we 720 * fix up the resulting too-small TPM_SHORT value to make things work. 721 * We also scale the TPM_MEDIUM and -_LONG values by 1000. 722 */ 723 if (chip->duration[TPM_SHORT] < (HZ / 100)) { 724 chip->duration[TPM_SHORT] = HZ; 725 chip->duration[TPM_MEDIUM] *= 1000; 726 chip->duration[TPM_LONG] *= 1000; 727 chip->duration_adjusted = true; 728 dev_info(&chip->dev, "Adjusting TPM timeout parameters."); 729 } 730 731 chip->flags |= TPM_CHIP_FLAG_HAVE_TIMEOUTS; 732 return 0; 733 } 734 EXPORT_SYMBOL_GPL(tpm_get_timeouts); 735 736 #define TPM_ORD_CONTINUE_SELFTEST 83 737 #define CONTINUE_SELFTEST_RESULT_SIZE 10 738 739 static const struct tpm_input_header continue_selftest_header = { 740 .tag = TPM_TAG_RQU_COMMAND, 741 .length = cpu_to_be32(10), 742 .ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST), 743 }; 744 745 /** 746 * tpm_continue_selftest -- run TPM's selftest 747 * @chip: TPM chip to use 748 * 749 * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing 750 * a TPM error code. 751 */ 752 static int tpm_continue_selftest(struct tpm_chip *chip) 753 { 754 int rc; 755 struct tpm_cmd_t cmd; 756 757 cmd.header.in = continue_selftest_header; 758 rc = tpm_transmit_cmd(chip, NULL, &cmd, CONTINUE_SELFTEST_RESULT_SIZE, 759 0, 0, "continue selftest"); 760 return rc; 761 } 762 763 #define TPM_ORDINAL_PCRREAD cpu_to_be32(21) 764 #define READ_PCR_RESULT_SIZE 30 765 #define READ_PCR_RESULT_BODY_SIZE 20 766 static const struct tpm_input_header pcrread_header = { 767 .tag = TPM_TAG_RQU_COMMAND, 768 .length = cpu_to_be32(14), 769 .ordinal = TPM_ORDINAL_PCRREAD 770 }; 771 772 int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf) 773 { 774 int rc; 775 struct tpm_cmd_t cmd; 776 777 cmd.header.in = pcrread_header; 778 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx); 779 rc = tpm_transmit_cmd(chip, NULL, &cmd, READ_PCR_RESULT_SIZE, 780 READ_PCR_RESULT_BODY_SIZE, 0, 781 "attempting to read a pcr value"); 782 783 if (rc == 0) 784 memcpy(res_buf, cmd.params.pcrread_out.pcr_result, 785 TPM_DIGEST_SIZE); 786 return rc; 787 } 788 789 /** 790 * tpm_is_tpm2 - is the chip a TPM2 chip? 791 * @chip_num: tpm idx # or ANY 792 * 793 * Returns < 0 on error, and 1 or 0 on success depending whether the chip 794 * is a TPM2 chip. 795 */ 796 int tpm_is_tpm2(u32 chip_num) 797 { 798 struct tpm_chip *chip; 799 int rc; 800 801 chip = tpm_chip_find_get(chip_num); 802 if (chip == NULL) 803 return -ENODEV; 804 805 rc = (chip->flags & TPM_CHIP_FLAG_TPM2) != 0; 806 807 tpm_put_ops(chip); 808 809 return rc; 810 } 811 EXPORT_SYMBOL_GPL(tpm_is_tpm2); 812 813 /** 814 * tpm_pcr_read - read a pcr value 815 * @chip_num: tpm idx # or ANY 816 * @pcr_idx: pcr idx to retrieve 817 * @res_buf: TPM_PCR value 818 * size of res_buf is 20 bytes (or NULL if you don't care) 819 * 820 * The TPM driver should be built-in, but for whatever reason it 821 * isn't, protect against the chip disappearing, by incrementing 822 * the module usage count. 823 */ 824 int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) 825 { 826 struct tpm_chip *chip; 827 int rc; 828 829 chip = tpm_chip_find_get(chip_num); 830 if (chip == NULL) 831 return -ENODEV; 832 if (chip->flags & TPM_CHIP_FLAG_TPM2) 833 rc = tpm2_pcr_read(chip, pcr_idx, res_buf); 834 else 835 rc = tpm_pcr_read_dev(chip, pcr_idx, res_buf); 836 tpm_put_ops(chip); 837 return rc; 838 } 839 EXPORT_SYMBOL_GPL(tpm_pcr_read); 840 841 #define TPM_ORD_PCR_EXTEND cpu_to_be32(20) 842 #define EXTEND_PCR_RESULT_SIZE 34 843 #define EXTEND_PCR_RESULT_BODY_SIZE 20 844 static const struct tpm_input_header pcrextend_header = { 845 .tag = TPM_TAG_RQU_COMMAND, 846 .length = cpu_to_be32(34), 847 .ordinal = TPM_ORD_PCR_EXTEND 848 }; 849 850 /** 851 * tpm_pcr_extend - extend pcr value with hash 852 * @chip_num: tpm idx # or AN& 853 * @pcr_idx: pcr idx to extend 854 * @hash: hash value used to extend pcr value 855 * 856 * The TPM driver should be built-in, but for whatever reason it 857 * isn't, protect against the chip disappearing, by incrementing 858 * the module usage count. 859 */ 860 int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) 861 { 862 struct tpm_cmd_t cmd; 863 int rc; 864 struct tpm_chip *chip; 865 struct tpm2_digest digest_list[ARRAY_SIZE(chip->active_banks)]; 866 u32 count = 0; 867 int i; 868 869 chip = tpm_chip_find_get(chip_num); 870 if (chip == NULL) 871 return -ENODEV; 872 873 if (chip->flags & TPM_CHIP_FLAG_TPM2) { 874 memset(digest_list, 0, sizeof(digest_list)); 875 876 for (i = 0; i < ARRAY_SIZE(chip->active_banks) && 877 chip->active_banks[i] != TPM2_ALG_ERROR; i++) { 878 digest_list[i].alg_id = chip->active_banks[i]; 879 memcpy(digest_list[i].digest, hash, TPM_DIGEST_SIZE); 880 count++; 881 } 882 883 rc = tpm2_pcr_extend(chip, pcr_idx, count, digest_list); 884 tpm_put_ops(chip); 885 return rc; 886 } 887 888 cmd.header.in = pcrextend_header; 889 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx); 890 memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE); 891 rc = tpm_transmit_cmd(chip, NULL, &cmd, EXTEND_PCR_RESULT_SIZE, 892 EXTEND_PCR_RESULT_BODY_SIZE, 0, 893 "attempting extend a PCR value"); 894 895 tpm_put_ops(chip); 896 return rc; 897 } 898 EXPORT_SYMBOL_GPL(tpm_pcr_extend); 899 900 /** 901 * tpm_do_selftest - have the TPM continue its selftest and wait until it 902 * can receive further commands 903 * @chip: TPM chip to use 904 * 905 * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing 906 * a TPM error code. 907 */ 908 int tpm_do_selftest(struct tpm_chip *chip) 909 { 910 int rc; 911 unsigned int loops; 912 unsigned int delay_msec = 100; 913 unsigned long duration; 914 u8 dummy[TPM_DIGEST_SIZE]; 915 916 duration = tpm_calc_ordinal_duration(chip, TPM_ORD_CONTINUE_SELFTEST); 917 918 loops = jiffies_to_msecs(duration) / delay_msec; 919 920 rc = tpm_continue_selftest(chip); 921 /* This may fail if there was no TPM driver during a suspend/resume 922 * cycle; some may return 10 (BAD_ORDINAL), others 28 (FAILEDSELFTEST) 923 */ 924 if (rc) 925 return rc; 926 927 do { 928 /* Attempt to read a PCR value */ 929 rc = tpm_pcr_read_dev(chip, 0, dummy); 930 931 /* Some buggy TPMs will not respond to tpm_tis_ready() for 932 * around 300ms while the self test is ongoing, keep trying 933 * until the self test duration expires. */ 934 if (rc == -ETIME) { 935 dev_info( 936 &chip->dev, HW_ERR 937 "TPM command timed out during continue self test"); 938 msleep(delay_msec); 939 continue; 940 } 941 942 if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) { 943 dev_info(&chip->dev, 944 "TPM is disabled/deactivated (0x%X)\n", rc); 945 /* TPM is disabled and/or deactivated; driver can 946 * proceed and TPM does handle commands for 947 * suspend/resume correctly 948 */ 949 return 0; 950 } 951 if (rc != TPM_WARN_DOING_SELFTEST) 952 return rc; 953 msleep(delay_msec); 954 } while (--loops > 0); 955 956 return rc; 957 } 958 EXPORT_SYMBOL_GPL(tpm_do_selftest); 959 960 /** 961 * tpm1_auto_startup - Perform the standard automatic TPM initialization 962 * sequence 963 * @chip: TPM chip to use 964 * 965 * Returns 0 on success, < 0 in case of fatal error. 966 */ 967 int tpm1_auto_startup(struct tpm_chip *chip) 968 { 969 int rc; 970 971 rc = tpm_get_timeouts(chip); 972 if (rc) 973 goto out; 974 rc = tpm_do_selftest(chip); 975 if (rc) { 976 dev_err(&chip->dev, "TPM self test failed\n"); 977 goto out; 978 } 979 980 return rc; 981 out: 982 if (rc > 0) 983 rc = -ENODEV; 984 return rc; 985 } 986 987 int tpm_send(u32 chip_num, void *cmd, size_t buflen) 988 { 989 struct tpm_chip *chip; 990 int rc; 991 992 chip = tpm_chip_find_get(chip_num); 993 if (chip == NULL) 994 return -ENODEV; 995 996 rc = tpm_transmit_cmd(chip, NULL, cmd, buflen, 0, 0, 997 "attempting tpm_cmd"); 998 tpm_put_ops(chip); 999 return rc; 1000 } 1001 EXPORT_SYMBOL_GPL(tpm_send); 1002 1003 static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask, 1004 bool check_cancel, bool *canceled) 1005 { 1006 u8 status = chip->ops->status(chip); 1007 1008 *canceled = false; 1009 if ((status & mask) == mask) 1010 return true; 1011 if (check_cancel && chip->ops->req_canceled(chip, status)) { 1012 *canceled = true; 1013 return true; 1014 } 1015 return false; 1016 } 1017 1018 int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout, 1019 wait_queue_head_t *queue, bool check_cancel) 1020 { 1021 unsigned long stop; 1022 long rc; 1023 u8 status; 1024 bool canceled = false; 1025 1026 /* check current status */ 1027 status = chip->ops->status(chip); 1028 if ((status & mask) == mask) 1029 return 0; 1030 1031 stop = jiffies + timeout; 1032 1033 if (chip->flags & TPM_CHIP_FLAG_IRQ) { 1034 again: 1035 timeout = stop - jiffies; 1036 if ((long)timeout <= 0) 1037 return -ETIME; 1038 rc = wait_event_interruptible_timeout(*queue, 1039 wait_for_tpm_stat_cond(chip, mask, check_cancel, 1040 &canceled), 1041 timeout); 1042 if (rc > 0) { 1043 if (canceled) 1044 return -ECANCELED; 1045 return 0; 1046 } 1047 if (rc == -ERESTARTSYS && freezing(current)) { 1048 clear_thread_flag(TIF_SIGPENDING); 1049 goto again; 1050 } 1051 } else { 1052 do { 1053 msleep(TPM_TIMEOUT); 1054 status = chip->ops->status(chip); 1055 if ((status & mask) == mask) 1056 return 0; 1057 } while (time_before(jiffies, stop)); 1058 } 1059 return -ETIME; 1060 } 1061 EXPORT_SYMBOL_GPL(wait_for_tpm_stat); 1062 1063 #define TPM_ORD_SAVESTATE cpu_to_be32(152) 1064 #define SAVESTATE_RESULT_SIZE 10 1065 1066 static const struct tpm_input_header savestate_header = { 1067 .tag = TPM_TAG_RQU_COMMAND, 1068 .length = cpu_to_be32(10), 1069 .ordinal = TPM_ORD_SAVESTATE 1070 }; 1071 1072 /* 1073 * We are about to suspend. Save the TPM state 1074 * so that it can be restored. 1075 */ 1076 int tpm_pm_suspend(struct device *dev) 1077 { 1078 struct tpm_chip *chip = dev_get_drvdata(dev); 1079 struct tpm_cmd_t cmd; 1080 int rc, try; 1081 1082 u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 }; 1083 1084 if (chip == NULL) 1085 return -ENODEV; 1086 1087 if (chip->flags & TPM_CHIP_FLAG_TPM2) { 1088 tpm2_shutdown(chip, TPM2_SU_STATE); 1089 return 0; 1090 } 1091 1092 /* for buggy tpm, flush pcrs with extend to selected dummy */ 1093 if (tpm_suspend_pcr) { 1094 cmd.header.in = pcrextend_header; 1095 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr); 1096 memcpy(cmd.params.pcrextend_in.hash, dummy_hash, 1097 TPM_DIGEST_SIZE); 1098 rc = tpm_transmit_cmd(chip, NULL, &cmd, EXTEND_PCR_RESULT_SIZE, 1099 EXTEND_PCR_RESULT_BODY_SIZE, 0, 1100 "extending dummy pcr before suspend"); 1101 } 1102 1103 /* now do the actual savestate */ 1104 for (try = 0; try < TPM_RETRY; try++) { 1105 cmd.header.in = savestate_header; 1106 rc = tpm_transmit_cmd(chip, NULL, &cmd, SAVESTATE_RESULT_SIZE, 1107 0, 0, NULL); 1108 1109 /* 1110 * If the TPM indicates that it is too busy to respond to 1111 * this command then retry before giving up. It can take 1112 * several seconds for this TPM to be ready. 1113 * 1114 * This can happen if the TPM has already been sent the 1115 * SaveState command before the driver has loaded. TCG 1.2 1116 * specification states that any communication after SaveState 1117 * may cause the TPM to invalidate previously saved state. 1118 */ 1119 if (rc != TPM_WARN_RETRY) 1120 break; 1121 msleep(TPM_TIMEOUT_RETRY); 1122 } 1123 1124 if (rc) 1125 dev_err(&chip->dev, 1126 "Error (%d) sending savestate before suspend\n", rc); 1127 else if (try > 0) 1128 dev_warn(&chip->dev, "TPM savestate took %dms\n", 1129 try * TPM_TIMEOUT_RETRY); 1130 1131 return rc; 1132 } 1133 EXPORT_SYMBOL_GPL(tpm_pm_suspend); 1134 1135 /* 1136 * Resume from a power safe. The BIOS already restored 1137 * the TPM state. 1138 */ 1139 int tpm_pm_resume(struct device *dev) 1140 { 1141 struct tpm_chip *chip = dev_get_drvdata(dev); 1142 1143 if (chip == NULL) 1144 return -ENODEV; 1145 1146 return 0; 1147 } 1148 EXPORT_SYMBOL_GPL(tpm_pm_resume); 1149 1150 #define TPM_GETRANDOM_RESULT_SIZE 18 1151 static const struct tpm_input_header tpm_getrandom_header = { 1152 .tag = TPM_TAG_RQU_COMMAND, 1153 .length = cpu_to_be32(14), 1154 .ordinal = TPM_ORD_GET_RANDOM 1155 }; 1156 1157 /** 1158 * tpm_get_random() - Get random bytes from the tpm's RNG 1159 * @chip_num: A specific chip number for the request or TPM_ANY_NUM 1160 * @out: destination buffer for the random bytes 1161 * @max: the max number of bytes to write to @out 1162 * 1163 * Returns < 0 on error and the number of bytes read on success 1164 */ 1165 int tpm_get_random(u32 chip_num, u8 *out, size_t max) 1166 { 1167 struct tpm_chip *chip; 1168 struct tpm_cmd_t tpm_cmd; 1169 u32 recd, num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA), rlength; 1170 int err, total = 0, retries = 5; 1171 u8 *dest = out; 1172 1173 if (!out || !num_bytes || max > TPM_MAX_RNG_DATA) 1174 return -EINVAL; 1175 1176 chip = tpm_chip_find_get(chip_num); 1177 if (chip == NULL) 1178 return -ENODEV; 1179 1180 if (chip->flags & TPM_CHIP_FLAG_TPM2) { 1181 err = tpm2_get_random(chip, out, max); 1182 tpm_put_ops(chip); 1183 return err; 1184 } 1185 1186 do { 1187 tpm_cmd.header.in = tpm_getrandom_header; 1188 tpm_cmd.params.getrandom_in.num_bytes = cpu_to_be32(num_bytes); 1189 1190 err = tpm_transmit_cmd(chip, NULL, &tpm_cmd, 1191 TPM_GETRANDOM_RESULT_SIZE + num_bytes, 1192 offsetof(struct tpm_getrandom_out, 1193 rng_data), 1194 0, "attempting get random"); 1195 if (err) 1196 break; 1197 1198 recd = be32_to_cpu(tpm_cmd.params.getrandom_out.rng_data_len); 1199 1200 rlength = be32_to_cpu(tpm_cmd.header.out.length); 1201 if (rlength < offsetof(struct tpm_getrandom_out, rng_data) + 1202 recd) { 1203 total = -EFAULT; 1204 break; 1205 } 1206 memcpy(dest, tpm_cmd.params.getrandom_out.rng_data, recd); 1207 1208 dest += recd; 1209 total += recd; 1210 num_bytes -= recd; 1211 } while (retries-- && total < max); 1212 1213 tpm_put_ops(chip); 1214 return total ? total : -EIO; 1215 } 1216 EXPORT_SYMBOL_GPL(tpm_get_random); 1217 1218 /** 1219 * tpm_seal_trusted() - seal a trusted key 1220 * @chip_num: A specific chip number for the request or TPM_ANY_NUM 1221 * @options: authentication values and other options 1222 * @payload: the key data in clear and encrypted form 1223 * 1224 * Returns < 0 on error and 0 on success. At the moment, only TPM 2.0 chips 1225 * are supported. 1226 */ 1227 int tpm_seal_trusted(u32 chip_num, struct trusted_key_payload *payload, 1228 struct trusted_key_options *options) 1229 { 1230 struct tpm_chip *chip; 1231 int rc; 1232 1233 chip = tpm_chip_find_get(chip_num); 1234 if (chip == NULL || !(chip->flags & TPM_CHIP_FLAG_TPM2)) 1235 return -ENODEV; 1236 1237 rc = tpm2_seal_trusted(chip, payload, options); 1238 1239 tpm_put_ops(chip); 1240 return rc; 1241 } 1242 EXPORT_SYMBOL_GPL(tpm_seal_trusted); 1243 1244 /** 1245 * tpm_unseal_trusted() - unseal a trusted key 1246 * @chip_num: A specific chip number for the request or TPM_ANY_NUM 1247 * @options: authentication values and other options 1248 * @payload: the key data in clear and encrypted form 1249 * 1250 * Returns < 0 on error and 0 on success. At the moment, only TPM 2.0 chips 1251 * are supported. 1252 */ 1253 int tpm_unseal_trusted(u32 chip_num, struct trusted_key_payload *payload, 1254 struct trusted_key_options *options) 1255 { 1256 struct tpm_chip *chip; 1257 int rc; 1258 1259 chip = tpm_chip_find_get(chip_num); 1260 if (chip == NULL || !(chip->flags & TPM_CHIP_FLAG_TPM2)) 1261 return -ENODEV; 1262 1263 rc = tpm2_unseal_trusted(chip, payload, options); 1264 1265 tpm_put_ops(chip); 1266 1267 return rc; 1268 } 1269 EXPORT_SYMBOL_GPL(tpm_unseal_trusted); 1270 1271 static int __init tpm_init(void) 1272 { 1273 int rc; 1274 1275 tpm_class = class_create(THIS_MODULE, "tpm"); 1276 if (IS_ERR(tpm_class)) { 1277 pr_err("couldn't create tpm class\n"); 1278 return PTR_ERR(tpm_class); 1279 } 1280 1281 tpmrm_class = class_create(THIS_MODULE, "tpmrm"); 1282 if (IS_ERR(tpmrm_class)) { 1283 pr_err("couldn't create tpmrm class\n"); 1284 class_destroy(tpm_class); 1285 return PTR_ERR(tpmrm_class); 1286 } 1287 1288 rc = alloc_chrdev_region(&tpm_devt, 0, 2*TPM_NUM_DEVICES, "tpm"); 1289 if (rc < 0) { 1290 pr_err("tpm: failed to allocate char dev region\n"); 1291 class_destroy(tpmrm_class); 1292 class_destroy(tpm_class); 1293 return rc; 1294 } 1295 1296 return 0; 1297 } 1298 1299 static void __exit tpm_exit(void) 1300 { 1301 idr_destroy(&dev_nums_idr); 1302 class_destroy(tpm_class); 1303 class_destroy(tpmrm_class); 1304 unregister_chrdev_region(tpm_devt, 2*TPM_NUM_DEVICES); 1305 } 1306 1307 subsys_initcall(tpm_init); 1308 module_exit(tpm_exit); 1309 1310 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); 1311 MODULE_DESCRIPTION("TPM Driver"); 1312 MODULE_VERSION("2.0"); 1313 MODULE_LICENSE("GPL"); 1314