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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 | // SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2012,2013 Infineon Technologies * * Authors: * Peter Huewe <peter.huewe@infineon.com> * * Device driver for TCG/TCPA TPM (trusted platform module). * Specifications at www.trustedcomputinggroup.org * * This device driver implements the TPM interface as defined in * the TCG TPM Interface Spec version 1.2, revision 1.0 and the * Infineon I2C Protocol Stack Specification v0.20. * * It is based on the original tpm_tis device driver from Leendert van * Dorn and Kyleen Hall. */ #include <linux/i2c.h> #include <linux/module.h> #include <linux/wait.h> #include "tpm.h" #define TPM_I2C_INFINEON_BUFSIZE 1260 /* max. number of iterations after I2C NAK */ #define MAX_COUNT 3 #define SLEEP_DURATION_LOW 55 #define SLEEP_DURATION_HI 65 /* max. number of iterations after I2C NAK for 'long' commands * we need this especially for sending TPM_READY, since the cleanup after the * transtion to the ready state may take some time, but it is unpredictable * how long it will take. */ #define MAX_COUNT_LONG 50 #define SLEEP_DURATION_LONG_LOW 200 #define SLEEP_DURATION_LONG_HI 220 /* After sending TPM_READY to 'reset' the TPM we have to sleep even longer */ #define SLEEP_DURATION_RESET_LOW 2400 #define SLEEP_DURATION_RESET_HI 2600 /* we want to use usleep_range instead of msleep for the 5ms TPM_TIMEOUT */ #define TPM_TIMEOUT_US_LOW (TPM_TIMEOUT * 1000) #define TPM_TIMEOUT_US_HI (TPM_TIMEOUT_US_LOW + 2000) /* expected value for DIDVID register */ #define TPM_TIS_I2C_DID_VID_9635 0xd1150b00L #define TPM_TIS_I2C_DID_VID_9645 0x001a15d1L enum i2c_chip_type { SLB9635, SLB9645, UNKNOWN, }; struct tpm_inf_dev { struct i2c_client *client; int locality; /* In addition to the data itself, the buffer must fit the 7-bit I2C * address and the direction bit. */ u8 buf[TPM_I2C_INFINEON_BUFSIZE + 1]; struct tpm_chip *chip; enum i2c_chip_type chip_type; unsigned int adapterlimit; }; static struct tpm_inf_dev tpm_dev; /* * iic_tpm_read() - read from TPM register * @addr: register address to read from * @buffer: provided by caller * @len: number of bytes to read * * Read len bytes from TPM register and put them into * buffer (little-endian format, i.e. first byte is put into buffer[0]). * * NOTE: TPM is big-endian for multi-byte values. Multi-byte * values have to be swapped. * * NOTE: We can't unfortunately use the combined read/write functions * provided by the i2c core as the TPM currently does not support the * repeated start condition and due to it's special requirements. * The i2c_smbus* functions do not work for this chip. * * Return -EIO on error, 0 on success. */ static int iic_tpm_read(u8 addr, u8 *buffer, size_t len) { struct i2c_msg msg1 = { .addr = tpm_dev.client->addr, .len = 1, .buf = &addr }; struct i2c_msg msg2 = { .addr = tpm_dev.client->addr, .flags = I2C_M_RD, .len = len, .buf = buffer }; struct i2c_msg msgs[] = {msg1, msg2}; int rc = 0; int count; unsigned int msglen = len; /* Lock the adapter for the duration of the whole sequence. */ if (!tpm_dev.client->adapter->algo->master_xfer) return -EOPNOTSUPP; i2c_lock_bus(tpm_dev.client->adapter, I2C_LOCK_SEGMENT); if (tpm_dev.chip_type == SLB9645) { /* use a combined read for newer chips * unfortunately the smbus functions are not suitable due to * the 32 byte limit of the smbus. * retries should usually not be needed, but are kept just to * be on the safe side. */ for (count = 0; count < MAX_COUNT; count++) { rc = __i2c_transfer(tpm_dev.client->adapter, msgs, 2); if (rc > 0) break; /* break here to skip sleep */ usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI); } } else { /* Expect to send one command message and one data message, but * support looping over each or both if necessary. */ while (len > 0) { /* slb9635 protocol should work in all cases */ for (count = 0; count < MAX_COUNT; count++) { rc = __i2c_transfer(tpm_dev.client->adapter, &msg1, 1); if (rc > 0) break; /* break here to skip sleep */ usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI); } if (rc <= 0) goto out; /* After the TPM has successfully received the register * address it needs some time, thus we're sleeping here * again, before retrieving the data */ for (count = 0; count < MAX_COUNT; count++) { if (tpm_dev.adapterlimit) { msglen = min_t(unsigned int, tpm_dev.adapterlimit, len); msg2.len = msglen; } usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI); rc = __i2c_transfer(tpm_dev.client->adapter, &msg2, 1); if (rc > 0) { /* Since len is unsigned, make doubly * sure we do not underflow it. */ if (msglen > len) len = 0; else len -= msglen; msg2.buf += msglen; break; } /* If the I2C adapter rejected the request (e.g * when the quirk read_max_len < len) fall back * to a sane minimum value and try again. */ if (rc == -EOPNOTSUPP) tpm_dev.adapterlimit = I2C_SMBUS_BLOCK_MAX; } if (rc <= 0) goto out; } } out: i2c_unlock_bus(tpm_dev.client->adapter, I2C_LOCK_SEGMENT); /* take care of 'guard time' */ usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI); /* __i2c_transfer returns the number of successfully transferred * messages. * So rc should be greater than 0 here otherwise we have an error. */ if (rc <= 0) return -EIO; return 0; } static int iic_tpm_write_generic(u8 addr, u8 *buffer, size_t len, unsigned int sleep_low, unsigned int sleep_hi, u8 max_count) { int rc = -EIO; int count; struct i2c_msg msg1 = { .addr = tpm_dev.client->addr, .len = len + 1, .buf = tpm_dev.buf }; if (len > TPM_I2C_INFINEON_BUFSIZE) return -EINVAL; if (!tpm_dev.client->adapter->algo->master_xfer) return -EOPNOTSUPP; i2c_lock_bus(tpm_dev.client->adapter, I2C_LOCK_SEGMENT); /* prepend the 'register address' to the buffer */ tpm_dev.buf[0] = addr; memcpy(&(tpm_dev.buf[1]), buffer, len); /* * NOTE: We have to use these special mechanisms here and unfortunately * cannot rely on the standard behavior of i2c_transfer. * Even for newer chips the smbus functions are not * suitable due to the 32 byte limit of the smbus. */ for (count = 0; count < max_count; count++) { rc = __i2c_transfer(tpm_dev.client->adapter, &msg1, 1); if (rc > 0) break; usleep_range(sleep_low, sleep_hi); } i2c_unlock_bus(tpm_dev.client->adapter, I2C_LOCK_SEGMENT); /* take care of 'guard time' */ usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI); /* __i2c_transfer returns the number of successfully transferred * messages. * So rc should be greater than 0 here otherwise we have an error. */ if (rc <= 0) return -EIO; return 0; } /* * iic_tpm_write() - write to TPM register * @addr: register address to write to * @buffer: containing data to be written * @len: number of bytes to write * * Write len bytes from provided buffer to TPM register (little * endian format, i.e. buffer[0] is written as first byte). * * NOTE: TPM is big-endian for multi-byte values. Multi-byte * values have to be swapped. * * NOTE: use this function instead of the iic_tpm_write_generic function. * * Return -EIO on error, 0 on success */ static int iic_tpm_write(u8 addr, u8 *buffer, size_t len) { return iic_tpm_write_generic(addr, buffer, len, SLEEP_DURATION_LOW, SLEEP_DURATION_HI, MAX_COUNT); } /* * This function is needed especially for the cleanup situation after * sending TPM_READY * */ static int iic_tpm_write_long(u8 addr, u8 *buffer, size_t len) { return iic_tpm_write_generic(addr, buffer, len, SLEEP_DURATION_LONG_LOW, SLEEP_DURATION_LONG_HI, MAX_COUNT_LONG); } enum tis_access { TPM_ACCESS_VALID = 0x80, TPM_ACCESS_ACTIVE_LOCALITY = 0x20, TPM_ACCESS_REQUEST_PENDING = 0x04, TPM_ACCESS_REQUEST_USE = 0x02, }; enum tis_status { TPM_STS_VALID = 0x80, TPM_STS_COMMAND_READY = 0x40, TPM_STS_GO = 0x20, TPM_STS_DATA_AVAIL = 0x10, TPM_STS_DATA_EXPECT = 0x08, }; enum tis_defaults { TIS_SHORT_TIMEOUT = 750, /* ms */ TIS_LONG_TIMEOUT = 2000, /* 2 sec */ }; #define TPM_ACCESS(l) (0x0000 | ((l) << 4)) #define TPM_STS(l) (0x0001 | ((l) << 4)) #define TPM_DATA_FIFO(l) (0x0005 | ((l) << 4)) #define TPM_DID_VID(l) (0x0006 | ((l) << 4)) static bool check_locality(struct tpm_chip *chip, int loc) { u8 buf; int rc; rc = iic_tpm_read(TPM_ACCESS(loc), &buf, 1); if (rc < 0) return false; if ((buf & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) == (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) { tpm_dev.locality = loc; return true; } return false; } /* implementation similar to tpm_tis */ static void release_locality(struct tpm_chip *chip, int loc, int force) { u8 buf; if (iic_tpm_read(TPM_ACCESS(loc), &buf, 1) < 0) return; if (force || (buf & (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) == (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) { buf = TPM_ACCESS_ACTIVE_LOCALITY; iic_tpm_write(TPM_ACCESS(loc), &buf, 1); } } static int request_locality(struct tpm_chip *chip, int loc) { unsigned long stop; u8 buf = TPM_ACCESS_REQUEST_USE; if (check_locality(chip, loc)) return loc; iic_tpm_write(TPM_ACCESS(loc), &buf, 1); /* wait for burstcount */ stop = jiffies + chip->timeout_a; do { if (check_locality(chip, loc)) return loc; usleep_range(TPM_TIMEOUT_US_LOW, TPM_TIMEOUT_US_HI); } while (time_before(jiffies, stop)); return -ETIME; } static u8 tpm_tis_i2c_status(struct tpm_chip *chip) { /* NOTE: since I2C read may fail, return 0 in this case --> time-out */ u8 buf = 0xFF; u8 i = 0; do { if (iic_tpm_read(TPM_STS(tpm_dev.locality), &buf, 1) < 0) return 0; i++; /* if locallity is set STS should not be 0xFF */ } while ((buf == 0xFF) && i < 10); return buf; } static void tpm_tis_i2c_ready(struct tpm_chip *chip) { /* this causes the current command to be aborted */ u8 buf = TPM_STS_COMMAND_READY; iic_tpm_write_long(TPM_STS(tpm_dev.locality), &buf, 1); } static ssize_t get_burstcount(struct tpm_chip *chip) { unsigned long stop; ssize_t burstcnt; u8 buf[3]; /* wait for burstcount */ /* which timeout value, spec has 2 answers (c & d) */ stop = jiffies + chip->timeout_d; do { /* Note: STS is little endian */ if (iic_tpm_read(TPM_STS(tpm_dev.locality)+1, buf, 3) < 0) burstcnt = 0; else burstcnt = (buf[2] << 16) + (buf[1] << 8) + buf[0]; if (burstcnt) return burstcnt; usleep_range(TPM_TIMEOUT_US_LOW, TPM_TIMEOUT_US_HI); } while (time_before(jiffies, stop)); return -EBUSY; } static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout, int *status) { unsigned long stop; /* check current status */ *status = tpm_tis_i2c_status(chip); if ((*status != 0xFF) && (*status & mask) == mask) return 0; stop = jiffies + timeout; do { /* since we just checked the status, give the TPM some time */ usleep_range(TPM_TIMEOUT_US_LOW, TPM_TIMEOUT_US_HI); *status = tpm_tis_i2c_status(chip); if ((*status & mask) == mask) return 0; } while (time_before(jiffies, stop)); return -ETIME; } static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count) { size_t size = 0; ssize_t burstcnt; u8 retries = 0; int rc; while (size < count) { burstcnt = get_burstcount(chip); /* burstcnt < 0 = TPM is busy */ if (burstcnt < 0) return burstcnt; /* limit received data to max. left */ if (burstcnt > (count - size)) burstcnt = count - size; rc = iic_tpm_read(TPM_DATA_FIFO(tpm_dev.locality), &(buf[size]), burstcnt); if (rc == 0) size += burstcnt; else if (rc < 0) retries++; /* avoid endless loop in case of broken HW */ if (retries > MAX_COUNT_LONG) return -EIO; } return size; } static int tpm_tis_i2c_recv(struct tpm_chip *chip, u8 *buf, size_t count) { int size = 0; int status; u32 expected; if (count < TPM_HEADER_SIZE) { size = -EIO; goto out; } /* read first 10 bytes, including tag, paramsize, and result */ size = recv_data(chip, buf, TPM_HEADER_SIZE); if (size < TPM_HEADER_SIZE) { dev_err(&chip->dev, "Unable to read header\n"); goto out; } expected = be32_to_cpu(*(__be32 *)(buf + 2)); if (((size_t) expected > count) || (expected < TPM_HEADER_SIZE)) { size = -EIO; goto out; } size += recv_data(chip, &buf[TPM_HEADER_SIZE], expected - TPM_HEADER_SIZE); if (size < expected) { dev_err(&chip->dev, "Unable to read remainder of result\n"); size = -ETIME; goto out; } wait_for_stat(chip, TPM_STS_VALID, chip->timeout_c, &status); if (status & TPM_STS_DATA_AVAIL) { /* retry? */ dev_err(&chip->dev, "Error left over data\n"); size = -EIO; goto out; } out: tpm_tis_i2c_ready(chip); /* The TPM needs some time to clean up here, * so we sleep rather than keeping the bus busy */ usleep_range(SLEEP_DURATION_RESET_LOW, SLEEP_DURATION_RESET_HI); release_locality(chip, tpm_dev.locality, 0); return size; } static int tpm_tis_i2c_send(struct tpm_chip *chip, u8 *buf, size_t len) { int rc, status; ssize_t burstcnt; size_t count = 0; u8 retries = 0; u8 sts = TPM_STS_GO; if (len > TPM_I2C_INFINEON_BUFSIZE) return -E2BIG; if (request_locality(chip, 0) < 0) return -EBUSY; status = tpm_tis_i2c_status(chip); if ((status & TPM_STS_COMMAND_READY) == 0) { tpm_tis_i2c_ready(chip); if (wait_for_stat (chip, TPM_STS_COMMAND_READY, chip->timeout_b, &status) < 0) { rc = -ETIME; goto out_err; } } while (count < len - 1) { burstcnt = get_burstcount(chip); /* burstcnt < 0 = TPM is busy */ if (burstcnt < 0) return burstcnt; if (burstcnt > (len - 1 - count)) burstcnt = len - 1 - count; rc = iic_tpm_write(TPM_DATA_FIFO(tpm_dev.locality), &(buf[count]), burstcnt); if (rc == 0) count += burstcnt; else if (rc < 0) retries++; /* avoid endless loop in case of broken HW */ if (retries > MAX_COUNT_LONG) { rc = -EIO; goto out_err; } wait_for_stat(chip, TPM_STS_VALID, chip->timeout_c, &status); if ((status & TPM_STS_DATA_EXPECT) == 0) { rc = -EIO; goto out_err; } } /* write last byte */ iic_tpm_write(TPM_DATA_FIFO(tpm_dev.locality), &(buf[count]), 1); wait_for_stat(chip, TPM_STS_VALID, chip->timeout_c, &status); if ((status & TPM_STS_DATA_EXPECT) != 0) { rc = -EIO; goto out_err; } /* go and do it */ iic_tpm_write(TPM_STS(tpm_dev.locality), &sts, 1); return 0; out_err: tpm_tis_i2c_ready(chip); /* The TPM needs some time to clean up here, * so we sleep rather than keeping the bus busy */ usleep_range(SLEEP_DURATION_RESET_LOW, SLEEP_DURATION_RESET_HI); release_locality(chip, tpm_dev.locality, 0); return rc; } static bool tpm_tis_i2c_req_canceled(struct tpm_chip *chip, u8 status) { return (status == TPM_STS_COMMAND_READY); } static const struct tpm_class_ops tpm_tis_i2c = { .flags = TPM_OPS_AUTO_STARTUP, .status = tpm_tis_i2c_status, .recv = tpm_tis_i2c_recv, .send = tpm_tis_i2c_send, .cancel = tpm_tis_i2c_ready, .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID, .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID, .req_canceled = tpm_tis_i2c_req_canceled, }; static int tpm_tis_i2c_init(struct device *dev) { u32 vendor; int rc = 0; struct tpm_chip *chip; chip = tpmm_chip_alloc(dev, &tpm_tis_i2c); if (IS_ERR(chip)) return PTR_ERR(chip); /* Default timeouts */ chip->timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT); chip->timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT); chip->timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT); chip->timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT); if (request_locality(chip, 0) != 0) { dev_err(dev, "could not request locality\n"); rc = -ENODEV; goto out_err; } /* read four bytes from DID_VID register */ if (iic_tpm_read(TPM_DID_VID(0), (u8 *)&vendor, 4) < 0) { dev_err(dev, "could not read vendor id\n"); rc = -EIO; goto out_release; } if (vendor == TPM_TIS_I2C_DID_VID_9645) { tpm_dev.chip_type = SLB9645; } else if (vendor == TPM_TIS_I2C_DID_VID_9635) { tpm_dev.chip_type = SLB9635; } else { dev_err(dev, "vendor id did not match! ID was %08x\n", vendor); rc = -ENODEV; goto out_release; } dev_info(dev, "1.2 TPM (device-id 0x%X)\n", vendor >> 16); tpm_dev.chip = chip; return tpm_chip_register(chip); out_release: release_locality(chip, tpm_dev.locality, 1); tpm_dev.client = NULL; out_err: return rc; } static const struct i2c_device_id tpm_tis_i2c_table[] = { {"tpm_i2c_infineon"}, {"slb9635tt"}, {"slb9645tt"}, {}, }; MODULE_DEVICE_TABLE(i2c, tpm_tis_i2c_table); #ifdef CONFIG_OF static const struct of_device_id tpm_tis_i2c_of_match[] = { {.compatible = "infineon,tpm_i2c_infineon"}, {.compatible = "infineon,slb9635tt"}, {.compatible = "infineon,slb9645tt"}, {}, }; MODULE_DEVICE_TABLE(of, tpm_tis_i2c_of_match); #endif static SIMPLE_DEV_PM_OPS(tpm_tis_i2c_ops, tpm_pm_suspend, tpm_pm_resume); static int tpm_tis_i2c_probe(struct i2c_client *client) { int rc; struct device *dev = &(client->dev); if (tpm_dev.client != NULL) { dev_err(dev, "This driver only supports one client at a time\n"); return -EBUSY; /* We only support one client */ } if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { dev_err(dev, "no algorithms associated to the i2c bus\n"); return -ENODEV; } tpm_dev.client = client; rc = tpm_tis_i2c_init(&client->dev); if (rc != 0) { tpm_dev.client = NULL; rc = -ENODEV; } return rc; } static void tpm_tis_i2c_remove(struct i2c_client *client) { struct tpm_chip *chip = tpm_dev.chip; tpm_chip_unregister(chip); release_locality(chip, tpm_dev.locality, 1); tpm_dev.client = NULL; } static struct i2c_driver tpm_tis_i2c_driver = { .id_table = tpm_tis_i2c_table, .probe = tpm_tis_i2c_probe, .remove = tpm_tis_i2c_remove, .driver = { .name = "tpm_i2c_infineon", .pm = &tpm_tis_i2c_ops, .of_match_table = of_match_ptr(tpm_tis_i2c_of_match), }, }; module_i2c_driver(tpm_tis_i2c_driver); MODULE_AUTHOR("Peter Huewe <peter.huewe@infineon.com>"); MODULE_DESCRIPTION("TPM TIS I2C Infineon Driver"); MODULE_VERSION("2.2.0"); MODULE_LICENSE("GPL"); |