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 return 0; 167 } 168 169 /** 170 * crb_cmd_ready - request tpm crb device to enter ready state 171 * 172 * @dev: crb device 173 * @priv: crb private data 174 * 175 * Write CRB_CTRL_REQ_CMD_READY to TPM_CRB_CTRL_REQ 176 * and poll till the device acknowledge it by clearing the bit. 177 * The device should respond within TIMEOUT_C. 178 * 179 * The function does nothing for devices with ACPI-start method 180 * or SMC-start method. 181 * 182 * Return: 0 on success -ETIME on timeout; 183 */ 184 static int crb_cmd_ready(struct device *dev, struct crb_priv *priv) 185 { 186 if ((priv->sm == ACPI_TPM2_START_METHOD) || 187 (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) || 188 (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC)) 189 return 0; 190 191 iowrite32(CRB_CTRL_REQ_CMD_READY, &priv->regs_t->ctrl_req); 192 if (!crb_wait_for_reg_32(&priv->regs_t->ctrl_req, 193 CRB_CTRL_REQ_CMD_READY /* mask */, 194 0, /* value */ 195 TPM2_TIMEOUT_C)) { 196 dev_warn(dev, "cmdReady timed out\n"); 197 return -ETIME; 198 } 199 200 return 0; 201 } 202 203 static int __crb_request_locality(struct device *dev, 204 struct crb_priv *priv, int loc) 205 { 206 u32 value = CRB_LOC_STATE_LOC_ASSIGNED | 207 CRB_LOC_STATE_TPM_REG_VALID_STS; 208 209 if (!priv->regs_h) 210 return 0; 211 212 iowrite32(CRB_LOC_CTRL_REQUEST_ACCESS, &priv->regs_h->loc_ctrl); 213 if (!crb_wait_for_reg_32(&priv->regs_h->loc_state, value, value, 214 TPM2_TIMEOUT_C)) { 215 dev_warn(dev, "TPM_LOC_STATE_x.requestAccess timed out\n"); 216 return -ETIME; 217 } 218 219 return 0; 220 } 221 222 static int crb_request_locality(struct tpm_chip *chip, int loc) 223 { 224 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 225 226 return __crb_request_locality(&chip->dev, priv, loc); 227 } 228 229 static int __crb_relinquish_locality(struct device *dev, 230 struct crb_priv *priv, int loc) 231 { 232 u32 mask = CRB_LOC_STATE_LOC_ASSIGNED | 233 CRB_LOC_STATE_TPM_REG_VALID_STS; 234 u32 value = CRB_LOC_STATE_TPM_REG_VALID_STS; 235 236 if (!priv->regs_h) 237 return 0; 238 239 iowrite32(CRB_LOC_CTRL_RELINQUISH, &priv->regs_h->loc_ctrl); 240 if (!crb_wait_for_reg_32(&priv->regs_h->loc_state, mask, value, 241 TPM2_TIMEOUT_C)) { 242 dev_warn(dev, "TPM_LOC_STATE_x.requestAccess timed out\n"); 243 return -ETIME; 244 } 245 246 return 0; 247 } 248 249 static int crb_relinquish_locality(struct tpm_chip *chip, int loc) 250 { 251 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 252 253 return __crb_relinquish_locality(&chip->dev, priv, loc); 254 } 255 256 static u8 crb_status(struct tpm_chip *chip) 257 { 258 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 259 u8 sts = 0; 260 261 if ((ioread32(&priv->regs_t->ctrl_start) & CRB_START_INVOKE) != 262 CRB_START_INVOKE) 263 sts |= CRB_DRV_STS_COMPLETE; 264 265 return sts; 266 } 267 268 static int crb_recv(struct tpm_chip *chip, u8 *buf, size_t count) 269 { 270 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 271 unsigned int expected; 272 273 /* sanity check */ 274 if (count < 6) 275 return -EIO; 276 277 if (ioread32(&priv->regs_t->ctrl_sts) & CRB_CTRL_STS_ERROR) 278 return -EIO; 279 280 memcpy_fromio(buf, priv->rsp, 6); 281 expected = be32_to_cpup((__be32 *) &buf[2]); 282 if (expected > count || expected < 6) 283 return -EIO; 284 285 memcpy_fromio(&buf[6], &priv->rsp[6], expected - 6); 286 287 return expected; 288 } 289 290 static int crb_do_acpi_start(struct tpm_chip *chip) 291 { 292 union acpi_object *obj; 293 int rc; 294 295 obj = acpi_evaluate_dsm(chip->acpi_dev_handle, 296 &crb_acpi_start_guid, 297 CRB_ACPI_START_REVISION_ID, 298 CRB_ACPI_START_INDEX, 299 NULL); 300 if (!obj) 301 return -ENXIO; 302 rc = obj->integer.value == 0 ? 0 : -ENXIO; 303 ACPI_FREE(obj); 304 return rc; 305 } 306 307 #ifdef CONFIG_ARM64 308 /* 309 * This is a TPM Command Response Buffer start method that invokes a 310 * Secure Monitor Call to requrest the firmware to execute or cancel 311 * a TPM 2.0 command. 312 */ 313 static int tpm_crb_smc_start(struct device *dev, unsigned long func_id) 314 { 315 struct arm_smccc_res res; 316 317 arm_smccc_smc(func_id, 0, 0, 0, 0, 0, 0, 0, &res); 318 if (res.a0 != 0) { 319 dev_err(dev, 320 FW_BUG "tpm_crb_smc_start() returns res.a0 = 0x%lx\n", 321 res.a0); 322 return -EIO; 323 } 324 325 return 0; 326 } 327 #else 328 static int tpm_crb_smc_start(struct device *dev, unsigned long func_id) 329 { 330 dev_err(dev, FW_BUG "tpm_crb: incorrect start method\n"); 331 return -EINVAL; 332 } 333 #endif 334 335 static int crb_send(struct tpm_chip *chip, u8 *buf, size_t len) 336 { 337 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 338 int rc = 0; 339 340 /* Zero the cancel register so that the next command will not get 341 * canceled. 342 */ 343 iowrite32(0, &priv->regs_t->ctrl_cancel); 344 345 if (len > priv->cmd_size) { 346 dev_err(&chip->dev, "invalid command count value %zd %d\n", 347 len, priv->cmd_size); 348 return -E2BIG; 349 } 350 351 memcpy_toio(priv->cmd, buf, len); 352 353 /* Make sure that cmd is populated before issuing start. */ 354 wmb(); 355 356 /* The reason for the extra quirk is that the PTT in 4th Gen Core CPUs 357 * report only ACPI start but in practice seems to require both 358 * CRB start, hence invoking CRB start method if hid == MSFT0101. 359 */ 360 if ((priv->sm == ACPI_TPM2_COMMAND_BUFFER) || 361 (priv->sm == ACPI_TPM2_MEMORY_MAPPED) || 362 (!strcmp(priv->hid, "MSFT0101"))) 363 iowrite32(CRB_START_INVOKE, &priv->regs_t->ctrl_start); 364 365 if ((priv->sm == ACPI_TPM2_START_METHOD) || 366 (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD)) 367 rc = crb_do_acpi_start(chip); 368 369 if (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC) { 370 iowrite32(CRB_START_INVOKE, &priv->regs_t->ctrl_start); 371 rc = tpm_crb_smc_start(&chip->dev, priv->smc_func_id); 372 } 373 374 return rc; 375 } 376 377 static void crb_cancel(struct tpm_chip *chip) 378 { 379 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 380 381 iowrite32(CRB_CANCEL_INVOKE, &priv->regs_t->ctrl_cancel); 382 383 if (((priv->sm == ACPI_TPM2_START_METHOD) || 384 (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD)) && 385 crb_do_acpi_start(chip)) 386 dev_err(&chip->dev, "ACPI Start failed\n"); 387 } 388 389 static bool crb_req_canceled(struct tpm_chip *chip, u8 status) 390 { 391 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 392 u32 cancel = ioread32(&priv->regs_t->ctrl_cancel); 393 394 return (cancel & CRB_CANCEL_INVOKE) == CRB_CANCEL_INVOKE; 395 } 396 397 static const struct tpm_class_ops tpm_crb = { 398 .flags = TPM_OPS_AUTO_STARTUP, 399 .status = crb_status, 400 .recv = crb_recv, 401 .send = crb_send, 402 .cancel = crb_cancel, 403 .req_canceled = crb_req_canceled, 404 .request_locality = crb_request_locality, 405 .relinquish_locality = crb_relinquish_locality, 406 .req_complete_mask = CRB_DRV_STS_COMPLETE, 407 .req_complete_val = CRB_DRV_STS_COMPLETE, 408 }; 409 410 static int crb_check_resource(struct acpi_resource *ares, void *data) 411 { 412 struct resource *io_res = data; 413 struct resource_win win; 414 struct resource *res = &(win.res); 415 416 if (acpi_dev_resource_memory(ares, res) || 417 acpi_dev_resource_address_space(ares, &win)) { 418 *io_res = *res; 419 io_res->name = NULL; 420 } 421 422 return 1; 423 } 424 425 static void __iomem *crb_map_res(struct device *dev, struct crb_priv *priv, 426 struct resource *io_res, u64 start, u32 size) 427 { 428 struct resource new_res = { 429 .start = start, 430 .end = start + size - 1, 431 .flags = IORESOURCE_MEM, 432 }; 433 434 /* Detect a 64 bit address on a 32 bit system */ 435 if (start != new_res.start) 436 return (void __iomem *) ERR_PTR(-EINVAL); 437 438 if (!resource_contains(io_res, &new_res)) 439 return devm_ioremap_resource(dev, &new_res); 440 441 return priv->iobase + (new_res.start - io_res->start); 442 } 443 444 /* 445 * Work around broken BIOSs that return inconsistent values from the ACPI 446 * region vs the registers. Trust the ACPI region. Such broken systems 447 * probably cannot send large TPM commands since the buffer will be truncated. 448 */ 449 static u64 crb_fixup_cmd_size(struct device *dev, struct resource *io_res, 450 u64 start, u64 size) 451 { 452 if (io_res->start > start || io_res->end < start) 453 return size; 454 455 if (start + size - 1 <= io_res->end) 456 return size; 457 458 dev_err(dev, 459 FW_BUG "ACPI region does not cover the entire command/response buffer. %pr vs %llx %llx\n", 460 io_res, start, size); 461 462 return io_res->end - start + 1; 463 } 464 465 static int crb_map_io(struct acpi_device *device, struct crb_priv *priv, 466 struct acpi_table_tpm2 *buf) 467 { 468 struct list_head resources; 469 struct resource io_res; 470 struct device *dev = &device->dev; 471 u32 pa_high, pa_low; 472 u64 cmd_pa; 473 u32 cmd_size; 474 __le64 __rsp_pa; 475 u64 rsp_pa; 476 u32 rsp_size; 477 int ret; 478 479 INIT_LIST_HEAD(&resources); 480 ret = acpi_dev_get_resources(device, &resources, crb_check_resource, 481 &io_res); 482 if (ret < 0) 483 return ret; 484 acpi_dev_free_resource_list(&resources); 485 486 if (resource_type(&io_res) != IORESOURCE_MEM) { 487 dev_err(dev, FW_BUG "TPM2 ACPI table does not define a memory resource\n"); 488 return -EINVAL; 489 } 490 491 priv->iobase = devm_ioremap_resource(dev, &io_res); 492 if (IS_ERR(priv->iobase)) 493 return PTR_ERR(priv->iobase); 494 495 /* The ACPI IO region starts at the head area and continues to include 496 * the control area, as one nice sane region except for some older 497 * stuff that puts the control area outside the ACPI IO region. 498 */ 499 if ((priv->sm == ACPI_TPM2_COMMAND_BUFFER) || 500 (priv->sm == ACPI_TPM2_MEMORY_MAPPED)) { 501 if (buf->control_address == io_res.start + 502 sizeof(*priv->regs_h)) 503 priv->regs_h = priv->iobase; 504 else 505 dev_warn(dev, FW_BUG "Bad ACPI memory layout"); 506 } 507 508 ret = __crb_request_locality(dev, priv, 0); 509 if (ret) 510 return ret; 511 512 priv->regs_t = crb_map_res(dev, priv, &io_res, buf->control_address, 513 sizeof(struct crb_regs_tail)); 514 if (IS_ERR(priv->regs_t)) 515 return PTR_ERR(priv->regs_t); 516 517 /* 518 * PTT HW bug w/a: wake up the device to access 519 * possibly not retained registers. 520 */ 521 ret = crb_cmd_ready(dev, priv); 522 if (ret) 523 return ret; 524 525 pa_high = ioread32(&priv->regs_t->ctrl_cmd_pa_high); 526 pa_low = ioread32(&priv->regs_t->ctrl_cmd_pa_low); 527 cmd_pa = ((u64)pa_high << 32) | pa_low; 528 cmd_size = crb_fixup_cmd_size(dev, &io_res, cmd_pa, 529 ioread32(&priv->regs_t->ctrl_cmd_size)); 530 531 dev_dbg(dev, "cmd_hi = %X cmd_low = %X cmd_size %X\n", 532 pa_high, pa_low, cmd_size); 533 534 priv->cmd = crb_map_res(dev, priv, &io_res, cmd_pa, cmd_size); 535 if (IS_ERR(priv->cmd)) { 536 ret = PTR_ERR(priv->cmd); 537 goto out; 538 } 539 540 memcpy_fromio(&__rsp_pa, &priv->regs_t->ctrl_rsp_pa, 8); 541 rsp_pa = le64_to_cpu(__rsp_pa); 542 rsp_size = crb_fixup_cmd_size(dev, &io_res, rsp_pa, 543 ioread32(&priv->regs_t->ctrl_rsp_size)); 544 545 if (cmd_pa != rsp_pa) { 546 priv->rsp = crb_map_res(dev, priv, &io_res, rsp_pa, rsp_size); 547 ret = PTR_ERR_OR_ZERO(priv->rsp); 548 goto out; 549 } 550 551 /* According to the PTP specification, overlapping command and response 552 * buffer sizes must be identical. 553 */ 554 if (cmd_size != rsp_size) { 555 dev_err(dev, FW_BUG "overlapping command and response buffer sizes are not identical"); 556 ret = -EINVAL; 557 goto out; 558 } 559 560 priv->rsp = priv->cmd; 561 562 out: 563 if (!ret) 564 priv->cmd_size = cmd_size; 565 566 crb_go_idle(dev, priv); 567 568 __crb_relinquish_locality(dev, priv, 0); 569 570 return ret; 571 } 572 573 static int crb_acpi_add(struct acpi_device *device) 574 { 575 struct acpi_table_tpm2 *buf; 576 struct crb_priv *priv; 577 struct tpm_chip *chip; 578 struct device *dev = &device->dev; 579 struct tpm2_crb_smc *crb_smc; 580 acpi_status status; 581 u32 sm; 582 int rc; 583 584 status = acpi_get_table(ACPI_SIG_TPM2, 1, 585 (struct acpi_table_header **) &buf); 586 if (ACPI_FAILURE(status) || buf->header.length < sizeof(*buf)) { 587 dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n"); 588 return -EINVAL; 589 } 590 591 /* Should the FIFO driver handle this? */ 592 sm = buf->start_method; 593 if (sm == ACPI_TPM2_MEMORY_MAPPED) 594 return -ENODEV; 595 596 priv = devm_kzalloc(dev, sizeof(struct crb_priv), GFP_KERNEL); 597 if (!priv) 598 return -ENOMEM; 599 600 if (sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC) { 601 if (buf->header.length < (sizeof(*buf) + sizeof(*crb_smc))) { 602 dev_err(dev, 603 FW_BUG "TPM2 ACPI table has wrong size %u for start method type %d\n", 604 buf->header.length, 605 ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC); 606 return -EINVAL; 607 } 608 crb_smc = ACPI_ADD_PTR(struct tpm2_crb_smc, buf, sizeof(*buf)); 609 priv->smc_func_id = crb_smc->smc_func_id; 610 } 611 612 priv->sm = sm; 613 priv->hid = acpi_device_hid(device); 614 615 rc = crb_map_io(device, priv, buf); 616 if (rc) 617 return rc; 618 619 chip = tpmm_chip_alloc(dev, &tpm_crb); 620 if (IS_ERR(chip)) 621 return PTR_ERR(chip); 622 623 dev_set_drvdata(&chip->dev, priv); 624 chip->acpi_dev_handle = device->handle; 625 chip->flags = TPM_CHIP_FLAG_TPM2; 626 627 rc = __crb_request_locality(dev, priv, 0); 628 if (rc) 629 return rc; 630 631 rc = crb_cmd_ready(dev, priv); 632 if (rc) 633 goto out; 634 635 pm_runtime_get_noresume(dev); 636 pm_runtime_set_active(dev); 637 pm_runtime_enable(dev); 638 639 rc = tpm_chip_register(chip); 640 if (rc) { 641 crb_go_idle(dev, priv); 642 pm_runtime_put_noidle(dev); 643 pm_runtime_disable(dev); 644 goto out; 645 } 646 647 pm_runtime_put_sync(dev); 648 649 out: 650 __crb_relinquish_locality(dev, priv, 0); 651 652 return rc; 653 } 654 655 static int crb_acpi_remove(struct acpi_device *device) 656 { 657 struct device *dev = &device->dev; 658 struct tpm_chip *chip = dev_get_drvdata(dev); 659 660 tpm_chip_unregister(chip); 661 662 pm_runtime_disable(dev); 663 664 return 0; 665 } 666 667 static int __maybe_unused crb_pm_runtime_suspend(struct device *dev) 668 { 669 struct tpm_chip *chip = dev_get_drvdata(dev); 670 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 671 672 return crb_go_idle(dev, priv); 673 } 674 675 static int __maybe_unused crb_pm_runtime_resume(struct device *dev) 676 { 677 struct tpm_chip *chip = dev_get_drvdata(dev); 678 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 679 680 return crb_cmd_ready(dev, priv); 681 } 682 683 static int __maybe_unused crb_pm_suspend(struct device *dev) 684 { 685 int ret; 686 687 ret = tpm_pm_suspend(dev); 688 if (ret) 689 return ret; 690 691 return crb_pm_runtime_suspend(dev); 692 } 693 694 static int __maybe_unused crb_pm_resume(struct device *dev) 695 { 696 int ret; 697 698 ret = crb_pm_runtime_resume(dev); 699 if (ret) 700 return ret; 701 702 return tpm_pm_resume(dev); 703 } 704 705 static const struct dev_pm_ops crb_pm = { 706 SET_SYSTEM_SLEEP_PM_OPS(crb_pm_suspend, crb_pm_resume) 707 SET_RUNTIME_PM_OPS(crb_pm_runtime_suspend, crb_pm_runtime_resume, NULL) 708 }; 709 710 static const struct acpi_device_id crb_device_ids[] = { 711 {"MSFT0101", 0}, 712 {"", 0}, 713 }; 714 MODULE_DEVICE_TABLE(acpi, crb_device_ids); 715 716 static struct acpi_driver crb_acpi_driver = { 717 .name = "tpm_crb", 718 .ids = crb_device_ids, 719 .ops = { 720 .add = crb_acpi_add, 721 .remove = crb_acpi_remove, 722 }, 723 .drv = { 724 .pm = &crb_pm, 725 }, 726 }; 727 728 module_acpi_driver(crb_acpi_driver); 729 MODULE_AUTHOR("Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>"); 730 MODULE_DESCRIPTION("TPM2 Driver"); 731 MODULE_VERSION("0.1"); 732 MODULE_LICENSE("GPL"); 733