1 /* 2 * Copyright (C) 2014 Intel Corporation 3 * 4 * Authors: 5 * Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> 6 * 7 * Maintained by: <tpmdd-devel@lists.sourceforge.net> 8 * 9 * This device driver implements the TPM interface as defined in 10 * the TCG CRB 2.0 TPM specification. 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; version 2 15 * of the License. 16 */ 17 18 #include <linux/acpi.h> 19 #include <linux/highmem.h> 20 #include <linux/rculist.h> 21 #include <linux/module.h> 22 #include <linux/pm_runtime.h> 23 #ifdef CONFIG_ARM64 24 #include <linux/arm-smccc.h> 25 #endif 26 #include "tpm.h" 27 28 #define ACPI_SIG_TPM2 "TPM2" 29 30 static const guid_t crb_acpi_start_guid = 31 GUID_INIT(0x6BBF6CAB, 0x5463, 0x4714, 32 0xB7, 0xCD, 0xF0, 0x20, 0x3C, 0x03, 0x68, 0xD4); 33 34 enum crb_defaults { 35 CRB_ACPI_START_REVISION_ID = 1, 36 CRB_ACPI_START_INDEX = 1, 37 }; 38 39 enum crb_loc_ctrl { 40 CRB_LOC_CTRL_REQUEST_ACCESS = BIT(0), 41 CRB_LOC_CTRL_RELINQUISH = BIT(1), 42 }; 43 44 enum crb_loc_state { 45 CRB_LOC_STATE_LOC_ASSIGNED = BIT(1), 46 CRB_LOC_STATE_TPM_REG_VALID_STS = BIT(7), 47 }; 48 49 enum crb_ctrl_req { 50 CRB_CTRL_REQ_CMD_READY = BIT(0), 51 CRB_CTRL_REQ_GO_IDLE = BIT(1), 52 }; 53 54 enum crb_ctrl_sts { 55 CRB_CTRL_STS_ERROR = BIT(0), 56 CRB_CTRL_STS_TPM_IDLE = BIT(1), 57 }; 58 59 enum crb_start { 60 CRB_START_INVOKE = BIT(0), 61 }; 62 63 enum crb_cancel { 64 CRB_CANCEL_INVOKE = BIT(0), 65 }; 66 67 struct crb_regs_head { 68 u32 loc_state; 69 u32 reserved1; 70 u32 loc_ctrl; 71 u32 loc_sts; 72 u8 reserved2[32]; 73 u64 intf_id; 74 u64 ctrl_ext; 75 } __packed; 76 77 struct crb_regs_tail { 78 u32 ctrl_req; 79 u32 ctrl_sts; 80 u32 ctrl_cancel; 81 u32 ctrl_start; 82 u32 ctrl_int_enable; 83 u32 ctrl_int_sts; 84 u32 ctrl_cmd_size; 85 u32 ctrl_cmd_pa_low; 86 u32 ctrl_cmd_pa_high; 87 u32 ctrl_rsp_size; 88 u64 ctrl_rsp_pa; 89 } __packed; 90 91 enum crb_status { 92 CRB_DRV_STS_COMPLETE = BIT(0), 93 }; 94 95 struct crb_priv { 96 u32 sm; 97 const char *hid; 98 void __iomem *iobase; 99 struct crb_regs_head __iomem *regs_h; 100 struct crb_regs_tail __iomem *regs_t; 101 u8 __iomem *cmd; 102 u8 __iomem *rsp; 103 u32 cmd_size; 104 u32 smc_func_id; 105 }; 106 107 struct tpm2_crb_smc { 108 u32 interrupt; 109 u8 interrupt_flags; 110 u8 op_flags; 111 u16 reserved2; 112 u32 smc_func_id; 113 }; 114 115 static bool crb_wait_for_reg_32(u32 __iomem *reg, u32 mask, u32 value, 116 unsigned long timeout) 117 { 118 ktime_t start; 119 ktime_t stop; 120 121 start = ktime_get(); 122 stop = ktime_add(start, ms_to_ktime(timeout)); 123 124 do { 125 if ((ioread32(reg) & mask) == value) 126 return true; 127 128 usleep_range(50, 100); 129 } while (ktime_before(ktime_get(), stop)); 130 131 return ((ioread32(reg) & mask) == value); 132 } 133 134 /** 135 * __crb_go_idle - request tpm crb device to go the idle state 136 * 137 * @dev: crb device 138 * @priv: crb private data 139 * 140 * Write CRB_CTRL_REQ_GO_IDLE to TPM_CRB_CTRL_REQ 141 * The device should respond within TIMEOUT_C by clearing the bit. 142 * Anyhow, we do not wait here as a consequent CMD_READY request 143 * will be handled correctly even if idle was not completed. 144 * 145 * The function does nothing for devices with ACPI-start method 146 * or SMC-start method. 147 * 148 * Return: 0 always 149 */ 150 static int __crb_go_idle(struct device *dev, struct crb_priv *priv) 151 { 152 if ((priv->sm == ACPI_TPM2_START_METHOD) || 153 (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) || 154 (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC)) 155 return 0; 156 157 iowrite32(CRB_CTRL_REQ_GO_IDLE, &priv->regs_t->ctrl_req); 158 159 if (!crb_wait_for_reg_32(&priv->regs_t->ctrl_req, 160 CRB_CTRL_REQ_GO_IDLE/* mask */, 161 0, /* value */ 162 TPM2_TIMEOUT_C)) { 163 dev_warn(dev, "goIdle timed out\n"); 164 return -ETIME; 165 } 166 167 return 0; 168 } 169 170 static int crb_go_idle(struct tpm_chip *chip) 171 { 172 struct device *dev = &chip->dev; 173 struct crb_priv *priv = dev_get_drvdata(dev); 174 175 return __crb_go_idle(dev, priv); 176 } 177 178 /** 179 * __crb_cmd_ready - request tpm crb device to enter ready state 180 * 181 * @dev: crb device 182 * @priv: crb private data 183 * 184 * Write CRB_CTRL_REQ_CMD_READY to TPM_CRB_CTRL_REQ 185 * and poll till the device acknowledge it by clearing the bit. 186 * The device should respond within TIMEOUT_C. 187 * 188 * The function does nothing for devices with ACPI-start method 189 * or SMC-start method. 190 * 191 * Return: 0 on success -ETIME on timeout; 192 */ 193 static int __crb_cmd_ready(struct device *dev, struct crb_priv *priv) 194 { 195 if ((priv->sm == ACPI_TPM2_START_METHOD) || 196 (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) || 197 (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC)) 198 return 0; 199 200 iowrite32(CRB_CTRL_REQ_CMD_READY, &priv->regs_t->ctrl_req); 201 if (!crb_wait_for_reg_32(&priv->regs_t->ctrl_req, 202 CRB_CTRL_REQ_CMD_READY /* mask */, 203 0, /* value */ 204 TPM2_TIMEOUT_C)) { 205 dev_warn(dev, "cmdReady timed out\n"); 206 return -ETIME; 207 } 208 209 return 0; 210 } 211 212 static int crb_cmd_ready(struct tpm_chip *chip) 213 { 214 struct device *dev = &chip->dev; 215 struct crb_priv *priv = dev_get_drvdata(dev); 216 217 return __crb_cmd_ready(dev, priv); 218 } 219 220 static int __crb_request_locality(struct device *dev, 221 struct crb_priv *priv, int loc) 222 { 223 u32 value = CRB_LOC_STATE_LOC_ASSIGNED | 224 CRB_LOC_STATE_TPM_REG_VALID_STS; 225 226 if (!priv->regs_h) 227 return 0; 228 229 iowrite32(CRB_LOC_CTRL_REQUEST_ACCESS, &priv->regs_h->loc_ctrl); 230 if (!crb_wait_for_reg_32(&priv->regs_h->loc_state, value, value, 231 TPM2_TIMEOUT_C)) { 232 dev_warn(dev, "TPM_LOC_STATE_x.requestAccess timed out\n"); 233 return -ETIME; 234 } 235 236 return 0; 237 } 238 239 static int crb_request_locality(struct tpm_chip *chip, int loc) 240 { 241 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 242 243 return __crb_request_locality(&chip->dev, priv, loc); 244 } 245 246 static int __crb_relinquish_locality(struct device *dev, 247 struct crb_priv *priv, int loc) 248 { 249 u32 mask = CRB_LOC_STATE_LOC_ASSIGNED | 250 CRB_LOC_STATE_TPM_REG_VALID_STS; 251 u32 value = CRB_LOC_STATE_TPM_REG_VALID_STS; 252 253 if (!priv->regs_h) 254 return 0; 255 256 iowrite32(CRB_LOC_CTRL_RELINQUISH, &priv->regs_h->loc_ctrl); 257 if (!crb_wait_for_reg_32(&priv->regs_h->loc_state, mask, value, 258 TPM2_TIMEOUT_C)) { 259 dev_warn(dev, "TPM_LOC_STATE_x.requestAccess timed out\n"); 260 return -ETIME; 261 } 262 263 return 0; 264 } 265 266 static int crb_relinquish_locality(struct tpm_chip *chip, int loc) 267 { 268 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 269 270 return __crb_relinquish_locality(&chip->dev, priv, loc); 271 } 272 273 static u8 crb_status(struct tpm_chip *chip) 274 { 275 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 276 u8 sts = 0; 277 278 if ((ioread32(&priv->regs_t->ctrl_start) & CRB_START_INVOKE) != 279 CRB_START_INVOKE) 280 sts |= CRB_DRV_STS_COMPLETE; 281 282 return sts; 283 } 284 285 static int crb_recv(struct tpm_chip *chip, u8 *buf, size_t count) 286 { 287 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 288 unsigned int expected; 289 290 /* A sanity check that the upper layer wants to get at least the header 291 * as that is the minimum size for any TPM response. 292 */ 293 if (count < TPM_HEADER_SIZE) 294 return -EIO; 295 296 /* If this bit is set, according to the spec, the TPM is in 297 * unrecoverable condition. 298 */ 299 if (ioread32(&priv->regs_t->ctrl_sts) & CRB_CTRL_STS_ERROR) 300 return -EIO; 301 302 /* Read the first 8 bytes in order to get the length of the response. 303 * We read exactly a quad word in order to make sure that the remaining 304 * reads will be aligned. 305 */ 306 memcpy_fromio(buf, priv->rsp, 8); 307 308 expected = be32_to_cpup((__be32 *)&buf[2]); 309 if (expected > count || expected < TPM_HEADER_SIZE) 310 return -EIO; 311 312 memcpy_fromio(&buf[8], &priv->rsp[8], expected - 8); 313 314 return expected; 315 } 316 317 static int crb_do_acpi_start(struct tpm_chip *chip) 318 { 319 union acpi_object *obj; 320 int rc; 321 322 obj = acpi_evaluate_dsm(chip->acpi_dev_handle, 323 &crb_acpi_start_guid, 324 CRB_ACPI_START_REVISION_ID, 325 CRB_ACPI_START_INDEX, 326 NULL); 327 if (!obj) 328 return -ENXIO; 329 rc = obj->integer.value == 0 ? 0 : -ENXIO; 330 ACPI_FREE(obj); 331 return rc; 332 } 333 334 #ifdef CONFIG_ARM64 335 /* 336 * This is a TPM Command Response Buffer start method that invokes a 337 * Secure Monitor Call to requrest the firmware to execute or cancel 338 * a TPM 2.0 command. 339 */ 340 static int tpm_crb_smc_start(struct device *dev, unsigned long func_id) 341 { 342 struct arm_smccc_res res; 343 344 arm_smccc_smc(func_id, 0, 0, 0, 0, 0, 0, 0, &res); 345 if (res.a0 != 0) { 346 dev_err(dev, 347 FW_BUG "tpm_crb_smc_start() returns res.a0 = 0x%lx\n", 348 res.a0); 349 return -EIO; 350 } 351 352 return 0; 353 } 354 #else 355 static int tpm_crb_smc_start(struct device *dev, unsigned long func_id) 356 { 357 dev_err(dev, FW_BUG "tpm_crb: incorrect start method\n"); 358 return -EINVAL; 359 } 360 #endif 361 362 static int crb_send(struct tpm_chip *chip, u8 *buf, size_t len) 363 { 364 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 365 int rc = 0; 366 367 /* Zero the cancel register so that the next command will not get 368 * canceled. 369 */ 370 iowrite32(0, &priv->regs_t->ctrl_cancel); 371 372 if (len > priv->cmd_size) { 373 dev_err(&chip->dev, "invalid command count value %zd %d\n", 374 len, priv->cmd_size); 375 return -E2BIG; 376 } 377 378 memcpy_toio(priv->cmd, buf, len); 379 380 /* Make sure that cmd is populated before issuing start. */ 381 wmb(); 382 383 /* The reason for the extra quirk is that the PTT in 4th Gen Core CPUs 384 * report only ACPI start but in practice seems to require both 385 * CRB start, hence invoking CRB start method if hid == MSFT0101. 386 */ 387 if ((priv->sm == ACPI_TPM2_COMMAND_BUFFER) || 388 (priv->sm == ACPI_TPM2_MEMORY_MAPPED) || 389 (!strcmp(priv->hid, "MSFT0101"))) 390 iowrite32(CRB_START_INVOKE, &priv->regs_t->ctrl_start); 391 392 if ((priv->sm == ACPI_TPM2_START_METHOD) || 393 (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD)) 394 rc = crb_do_acpi_start(chip); 395 396 if (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC) { 397 iowrite32(CRB_START_INVOKE, &priv->regs_t->ctrl_start); 398 rc = tpm_crb_smc_start(&chip->dev, priv->smc_func_id); 399 } 400 401 return rc; 402 } 403 404 static void crb_cancel(struct tpm_chip *chip) 405 { 406 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 407 408 iowrite32(CRB_CANCEL_INVOKE, &priv->regs_t->ctrl_cancel); 409 410 if (((priv->sm == ACPI_TPM2_START_METHOD) || 411 (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD)) && 412 crb_do_acpi_start(chip)) 413 dev_err(&chip->dev, "ACPI Start failed\n"); 414 } 415 416 static bool crb_req_canceled(struct tpm_chip *chip, u8 status) 417 { 418 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 419 u32 cancel = ioread32(&priv->regs_t->ctrl_cancel); 420 421 return (cancel & CRB_CANCEL_INVOKE) == CRB_CANCEL_INVOKE; 422 } 423 424 static const struct tpm_class_ops tpm_crb = { 425 .flags = TPM_OPS_AUTO_STARTUP, 426 .status = crb_status, 427 .recv = crb_recv, 428 .send = crb_send, 429 .cancel = crb_cancel, 430 .req_canceled = crb_req_canceled, 431 .go_idle = crb_go_idle, 432 .cmd_ready = crb_cmd_ready, 433 .request_locality = crb_request_locality, 434 .relinquish_locality = crb_relinquish_locality, 435 .req_complete_mask = CRB_DRV_STS_COMPLETE, 436 .req_complete_val = CRB_DRV_STS_COMPLETE, 437 }; 438 439 static int crb_check_resource(struct acpi_resource *ares, void *data) 440 { 441 struct resource *io_res = data; 442 struct resource_win win; 443 struct resource *res = &(win.res); 444 445 if (acpi_dev_resource_memory(ares, res) || 446 acpi_dev_resource_address_space(ares, &win)) { 447 *io_res = *res; 448 io_res->name = NULL; 449 } 450 451 return 1; 452 } 453 454 static void __iomem *crb_map_res(struct device *dev, struct crb_priv *priv, 455 struct resource *io_res, u64 start, u32 size) 456 { 457 struct resource new_res = { 458 .start = start, 459 .end = start + size - 1, 460 .flags = IORESOURCE_MEM, 461 }; 462 463 /* Detect a 64 bit address on a 32 bit system */ 464 if (start != new_res.start) 465 return (void __iomem *) ERR_PTR(-EINVAL); 466 467 if (!resource_contains(io_res, &new_res)) 468 return devm_ioremap_resource(dev, &new_res); 469 470 return priv->iobase + (new_res.start - io_res->start); 471 } 472 473 /* 474 * Work around broken BIOSs that return inconsistent values from the ACPI 475 * region vs the registers. Trust the ACPI region. Such broken systems 476 * probably cannot send large TPM commands since the buffer will be truncated. 477 */ 478 static u64 crb_fixup_cmd_size(struct device *dev, struct resource *io_res, 479 u64 start, u64 size) 480 { 481 if (io_res->start > start || io_res->end < start) 482 return size; 483 484 if (start + size - 1 <= io_res->end) 485 return size; 486 487 dev_err(dev, 488 FW_BUG "ACPI region does not cover the entire command/response buffer. %pr vs %llx %llx\n", 489 io_res, start, size); 490 491 return io_res->end - start + 1; 492 } 493 494 static int crb_map_io(struct acpi_device *device, struct crb_priv *priv, 495 struct acpi_table_tpm2 *buf) 496 { 497 struct list_head resources; 498 struct resource io_res; 499 struct device *dev = &device->dev; 500 u32 pa_high, pa_low; 501 u64 cmd_pa; 502 u32 cmd_size; 503 __le64 __rsp_pa; 504 u64 rsp_pa; 505 u32 rsp_size; 506 int ret; 507 508 INIT_LIST_HEAD(&resources); 509 ret = acpi_dev_get_resources(device, &resources, crb_check_resource, 510 &io_res); 511 if (ret < 0) 512 return ret; 513 acpi_dev_free_resource_list(&resources); 514 515 if (resource_type(&io_res) != IORESOURCE_MEM) { 516 dev_err(dev, FW_BUG "TPM2 ACPI table does not define a memory resource\n"); 517 return -EINVAL; 518 } 519 520 priv->iobase = devm_ioremap_resource(dev, &io_res); 521 if (IS_ERR(priv->iobase)) 522 return PTR_ERR(priv->iobase); 523 524 /* The ACPI IO region starts at the head area and continues to include 525 * the control area, as one nice sane region except for some older 526 * stuff that puts the control area outside the ACPI IO region. 527 */ 528 if ((priv->sm == ACPI_TPM2_COMMAND_BUFFER) || 529 (priv->sm == ACPI_TPM2_MEMORY_MAPPED)) { 530 if (buf->control_address == io_res.start + 531 sizeof(*priv->regs_h)) 532 priv->regs_h = priv->iobase; 533 else 534 dev_warn(dev, FW_BUG "Bad ACPI memory layout"); 535 } 536 537 ret = __crb_request_locality(dev, priv, 0); 538 if (ret) 539 return ret; 540 541 priv->regs_t = crb_map_res(dev, priv, &io_res, buf->control_address, 542 sizeof(struct crb_regs_tail)); 543 if (IS_ERR(priv->regs_t)) { 544 ret = PTR_ERR(priv->regs_t); 545 goto out_relinquish_locality; 546 } 547 548 /* 549 * PTT HW bug w/a: wake up the device to access 550 * possibly not retained registers. 551 */ 552 ret = __crb_cmd_ready(dev, priv); 553 if (ret) 554 goto out_relinquish_locality; 555 556 pa_high = ioread32(&priv->regs_t->ctrl_cmd_pa_high); 557 pa_low = ioread32(&priv->regs_t->ctrl_cmd_pa_low); 558 cmd_pa = ((u64)pa_high << 32) | pa_low; 559 cmd_size = crb_fixup_cmd_size(dev, &io_res, cmd_pa, 560 ioread32(&priv->regs_t->ctrl_cmd_size)); 561 562 dev_dbg(dev, "cmd_hi = %X cmd_low = %X cmd_size %X\n", 563 pa_high, pa_low, cmd_size); 564 565 priv->cmd = crb_map_res(dev, priv, &io_res, cmd_pa, cmd_size); 566 if (IS_ERR(priv->cmd)) { 567 ret = PTR_ERR(priv->cmd); 568 goto out; 569 } 570 571 memcpy_fromio(&__rsp_pa, &priv->regs_t->ctrl_rsp_pa, 8); 572 rsp_pa = le64_to_cpu(__rsp_pa); 573 rsp_size = crb_fixup_cmd_size(dev, &io_res, rsp_pa, 574 ioread32(&priv->regs_t->ctrl_rsp_size)); 575 576 if (cmd_pa != rsp_pa) { 577 priv->rsp = crb_map_res(dev, priv, &io_res, rsp_pa, rsp_size); 578 ret = PTR_ERR_OR_ZERO(priv->rsp); 579 goto out; 580 } 581 582 /* According to the PTP specification, overlapping command and response 583 * buffer sizes must be identical. 584 */ 585 if (cmd_size != rsp_size) { 586 dev_err(dev, FW_BUG "overlapping command and response buffer sizes are not identical"); 587 ret = -EINVAL; 588 goto out; 589 } 590 591 priv->rsp = priv->cmd; 592 593 out: 594 if (!ret) 595 priv->cmd_size = cmd_size; 596 597 __crb_go_idle(dev, priv); 598 599 out_relinquish_locality: 600 601 __crb_relinquish_locality(dev, priv, 0); 602 603 return ret; 604 } 605 606 static int crb_acpi_add(struct acpi_device *device) 607 { 608 struct acpi_table_tpm2 *buf; 609 struct crb_priv *priv; 610 struct tpm_chip *chip; 611 struct device *dev = &device->dev; 612 struct tpm2_crb_smc *crb_smc; 613 acpi_status status; 614 u32 sm; 615 int rc; 616 617 status = acpi_get_table(ACPI_SIG_TPM2, 1, 618 (struct acpi_table_header **) &buf); 619 if (ACPI_FAILURE(status) || buf->header.length < sizeof(*buf)) { 620 dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n"); 621 return -EINVAL; 622 } 623 624 /* Should the FIFO driver handle this? */ 625 sm = buf->start_method; 626 if (sm == ACPI_TPM2_MEMORY_MAPPED) 627 return -ENODEV; 628 629 priv = devm_kzalloc(dev, sizeof(struct crb_priv), GFP_KERNEL); 630 if (!priv) 631 return -ENOMEM; 632 633 if (sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC) { 634 if (buf->header.length < (sizeof(*buf) + sizeof(*crb_smc))) { 635 dev_err(dev, 636 FW_BUG "TPM2 ACPI table has wrong size %u for start method type %d\n", 637 buf->header.length, 638 ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC); 639 return -EINVAL; 640 } 641 crb_smc = ACPI_ADD_PTR(struct tpm2_crb_smc, buf, sizeof(*buf)); 642 priv->smc_func_id = crb_smc->smc_func_id; 643 } 644 645 priv->sm = sm; 646 priv->hid = acpi_device_hid(device); 647 648 rc = crb_map_io(device, priv, buf); 649 if (rc) 650 return rc; 651 652 chip = tpmm_chip_alloc(dev, &tpm_crb); 653 if (IS_ERR(chip)) 654 return PTR_ERR(chip); 655 656 dev_set_drvdata(&chip->dev, priv); 657 chip->acpi_dev_handle = device->handle; 658 chip->flags = TPM_CHIP_FLAG_TPM2; 659 660 return tpm_chip_register(chip); 661 } 662 663 static int crb_acpi_remove(struct acpi_device *device) 664 { 665 struct device *dev = &device->dev; 666 struct tpm_chip *chip = dev_get_drvdata(dev); 667 668 tpm_chip_unregister(chip); 669 670 return 0; 671 } 672 673 static const struct dev_pm_ops crb_pm = { 674 SET_SYSTEM_SLEEP_PM_OPS(tpm_pm_suspend, tpm_pm_resume) 675 }; 676 677 static const struct acpi_device_id crb_device_ids[] = { 678 {"MSFT0101", 0}, 679 {"", 0}, 680 }; 681 MODULE_DEVICE_TABLE(acpi, crb_device_ids); 682 683 static struct acpi_driver crb_acpi_driver = { 684 .name = "tpm_crb", 685 .ids = crb_device_ids, 686 .ops = { 687 .add = crb_acpi_add, 688 .remove = crb_acpi_remove, 689 }, 690 .drv = { 691 .pm = &crb_pm, 692 }, 693 }; 694 695 module_acpi_driver(crb_acpi_driver); 696 MODULE_AUTHOR("Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>"); 697 MODULE_DESCRIPTION("TPM2 Driver"); 698 MODULE_VERSION("0.1"); 699 MODULE_LICENSE("GPL"); 700