1 /* 2 * Copyright (C) 2012 IBM Corporation 3 * 4 * Author: Ashley Lai <adlai@us.ibm.com> 5 * 6 * Maintained by: <tpmdd-devel@lists.sourceforge.net> 7 * 8 * Device driver for TCG/TCPA TPM (trusted platform module). 9 * Specifications at www.trustedcomputinggroup.org 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License as 13 * published by the Free Software Foundation, version 2 of the 14 * License. 15 * 16 */ 17 18 #include <linux/dma-mapping.h> 19 #include <linux/dmapool.h> 20 #include <linux/slab.h> 21 #include <asm/vio.h> 22 #include <asm/irq.h> 23 #include <linux/types.h> 24 #include <linux/list.h> 25 #include <linux/spinlock.h> 26 #include <linux/interrupt.h> 27 #include <linux/wait.h> 28 #include <asm/prom.h> 29 30 #include "tpm.h" 31 #include "tpm_ibmvtpm.h" 32 33 static const char tpm_ibmvtpm_driver_name[] = "tpm_ibmvtpm"; 34 35 static struct vio_device_id tpm_ibmvtpm_device_table[] = { 36 { "IBM,vtpm", "IBM,vtpm"}, 37 { "", "" } 38 }; 39 MODULE_DEVICE_TABLE(vio, tpm_ibmvtpm_device_table); 40 41 /** 42 * ibmvtpm_send_crq - Send a CRQ request 43 * @vdev: vio device struct 44 * @w1: first word 45 * @w2: second word 46 * 47 * Return value: 48 * 0 -Sucess 49 * Non-zero - Failure 50 */ 51 static int ibmvtpm_send_crq(struct vio_dev *vdev, u64 w1, u64 w2) 52 { 53 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, w1, w2); 54 } 55 56 /** 57 * ibmvtpm_get_data - Retrieve ibm vtpm data 58 * @dev: device struct 59 * 60 * Return value: 61 * vtpm device struct 62 */ 63 static struct ibmvtpm_dev *ibmvtpm_get_data(const struct device *dev) 64 { 65 struct tpm_chip *chip = dev_get_drvdata(dev); 66 if (chip) 67 return (struct ibmvtpm_dev *)TPM_VPRIV(chip); 68 return NULL; 69 } 70 71 /** 72 * tpm_ibmvtpm_recv - Receive data after send 73 * @chip: tpm chip struct 74 * @buf: buffer to read 75 * count: size of buffer 76 * 77 * Return value: 78 * Number of bytes read 79 */ 80 static int tpm_ibmvtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count) 81 { 82 struct ibmvtpm_dev *ibmvtpm; 83 u16 len; 84 int sig; 85 86 ibmvtpm = (struct ibmvtpm_dev *)TPM_VPRIV(chip); 87 88 if (!ibmvtpm->rtce_buf) { 89 dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n"); 90 return 0; 91 } 92 93 sig = wait_event_interruptible(ibmvtpm->wq, ibmvtpm->res_len != 0); 94 if (sig) 95 return -EINTR; 96 97 len = ibmvtpm->res_len; 98 99 if (count < len) { 100 dev_err(ibmvtpm->dev, 101 "Invalid size in recv: count=%zd, crq_size=%d\n", 102 count, len); 103 return -EIO; 104 } 105 106 spin_lock(&ibmvtpm->rtce_lock); 107 memcpy((void *)buf, (void *)ibmvtpm->rtce_buf, len); 108 memset(ibmvtpm->rtce_buf, 0, len); 109 ibmvtpm->res_len = 0; 110 spin_unlock(&ibmvtpm->rtce_lock); 111 return len; 112 } 113 114 /** 115 * tpm_ibmvtpm_send - Send tpm request 116 * @chip: tpm chip struct 117 * @buf: buffer contains data to send 118 * count: size of buffer 119 * 120 * Return value: 121 * Number of bytes sent 122 */ 123 static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count) 124 { 125 struct ibmvtpm_dev *ibmvtpm; 126 struct ibmvtpm_crq crq; 127 u64 *word = (u64 *) &crq; 128 int rc; 129 130 ibmvtpm = (struct ibmvtpm_dev *)TPM_VPRIV(chip); 131 132 if (!ibmvtpm->rtce_buf) { 133 dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n"); 134 return 0; 135 } 136 137 if (count > ibmvtpm->rtce_size) { 138 dev_err(ibmvtpm->dev, 139 "Invalid size in send: count=%zd, rtce_size=%d\n", 140 count, ibmvtpm->rtce_size); 141 return -EIO; 142 } 143 144 spin_lock(&ibmvtpm->rtce_lock); 145 memcpy((void *)ibmvtpm->rtce_buf, (void *)buf, count); 146 crq.valid = (u8)IBMVTPM_VALID_CMD; 147 crq.msg = (u8)VTPM_TPM_COMMAND; 148 crq.len = (u16)count; 149 crq.data = ibmvtpm->rtce_dma_handle; 150 151 rc = ibmvtpm_send_crq(ibmvtpm->vdev, word[0], word[1]); 152 if (rc != H_SUCCESS) { 153 dev_err(ibmvtpm->dev, "tpm_ibmvtpm_send failed rc=%d\n", rc); 154 rc = 0; 155 } else 156 rc = count; 157 158 spin_unlock(&ibmvtpm->rtce_lock); 159 return rc; 160 } 161 162 static void tpm_ibmvtpm_cancel(struct tpm_chip *chip) 163 { 164 return; 165 } 166 167 static u8 tpm_ibmvtpm_status(struct tpm_chip *chip) 168 { 169 return 0; 170 } 171 172 /** 173 * ibmvtpm_crq_get_rtce_size - Send a CRQ request to get rtce size 174 * @ibmvtpm: vtpm device struct 175 * 176 * Return value: 177 * 0 - Success 178 * Non-zero - Failure 179 */ 180 static int ibmvtpm_crq_get_rtce_size(struct ibmvtpm_dev *ibmvtpm) 181 { 182 struct ibmvtpm_crq crq; 183 u64 *buf = (u64 *) &crq; 184 int rc; 185 186 crq.valid = (u8)IBMVTPM_VALID_CMD; 187 crq.msg = (u8)VTPM_GET_RTCE_BUFFER_SIZE; 188 189 rc = ibmvtpm_send_crq(ibmvtpm->vdev, buf[0], buf[1]); 190 if (rc != H_SUCCESS) 191 dev_err(ibmvtpm->dev, 192 "ibmvtpm_crq_get_rtce_size failed rc=%d\n", rc); 193 194 return rc; 195 } 196 197 /** 198 * ibmvtpm_crq_get_version - Send a CRQ request to get vtpm version 199 * - Note that this is vtpm version and not tpm version 200 * @ibmvtpm: vtpm device struct 201 * 202 * Return value: 203 * 0 - Success 204 * Non-zero - Failure 205 */ 206 static int ibmvtpm_crq_get_version(struct ibmvtpm_dev *ibmvtpm) 207 { 208 struct ibmvtpm_crq crq; 209 u64 *buf = (u64 *) &crq; 210 int rc; 211 212 crq.valid = (u8)IBMVTPM_VALID_CMD; 213 crq.msg = (u8)VTPM_GET_VERSION; 214 215 rc = ibmvtpm_send_crq(ibmvtpm->vdev, buf[0], buf[1]); 216 if (rc != H_SUCCESS) 217 dev_err(ibmvtpm->dev, 218 "ibmvtpm_crq_get_version failed rc=%d\n", rc); 219 220 return rc; 221 } 222 223 /** 224 * ibmvtpm_crq_send_init_complete - Send a CRQ initialize complete message 225 * @ibmvtpm: vtpm device struct 226 * 227 * Return value: 228 * 0 - Success 229 * Non-zero - Failure 230 */ 231 static int ibmvtpm_crq_send_init_complete(struct ibmvtpm_dev *ibmvtpm) 232 { 233 int rc; 234 235 rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_COMP_CMD, 0); 236 if (rc != H_SUCCESS) 237 dev_err(ibmvtpm->dev, 238 "ibmvtpm_crq_send_init_complete failed rc=%d\n", rc); 239 240 return rc; 241 } 242 243 /** 244 * ibmvtpm_crq_send_init - Send a CRQ initialize message 245 * @ibmvtpm: vtpm device struct 246 * 247 * Return value: 248 * 0 - Success 249 * Non-zero - Failure 250 */ 251 static int ibmvtpm_crq_send_init(struct ibmvtpm_dev *ibmvtpm) 252 { 253 int rc; 254 255 rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_CMD, 0); 256 if (rc != H_SUCCESS) 257 dev_err(ibmvtpm->dev, 258 "ibmvtpm_crq_send_init failed rc=%d\n", rc); 259 260 return rc; 261 } 262 263 /** 264 * tpm_ibmvtpm_remove - ibm vtpm remove entry point 265 * @vdev: vio device struct 266 * 267 * Return value: 268 * 0 269 */ 270 static int tpm_ibmvtpm_remove(struct vio_dev *vdev) 271 { 272 struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev); 273 int rc = 0; 274 275 free_irq(vdev->irq, ibmvtpm); 276 277 do { 278 if (rc) 279 msleep(100); 280 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); 281 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 282 283 dma_unmap_single(ibmvtpm->dev, ibmvtpm->crq_dma_handle, 284 CRQ_RES_BUF_SIZE, DMA_BIDIRECTIONAL); 285 free_page((unsigned long)ibmvtpm->crq_queue.crq_addr); 286 287 if (ibmvtpm->rtce_buf) { 288 dma_unmap_single(ibmvtpm->dev, ibmvtpm->rtce_dma_handle, 289 ibmvtpm->rtce_size, DMA_BIDIRECTIONAL); 290 kfree(ibmvtpm->rtce_buf); 291 } 292 293 tpm_remove_hardware(ibmvtpm->dev); 294 295 kfree(ibmvtpm); 296 297 return 0; 298 } 299 300 /** 301 * tpm_ibmvtpm_get_desired_dma - Get DMA size needed by this driver 302 * @vdev: vio device struct 303 * 304 * Return value: 305 * Number of bytes the driver needs to DMA map 306 */ 307 static unsigned long tpm_ibmvtpm_get_desired_dma(struct vio_dev *vdev) 308 { 309 struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev); 310 return CRQ_RES_BUF_SIZE + ibmvtpm->rtce_size; 311 } 312 313 /** 314 * tpm_ibmvtpm_suspend - Suspend 315 * @dev: device struct 316 * 317 * Return value: 318 * 0 319 */ 320 static int tpm_ibmvtpm_suspend(struct device *dev) 321 { 322 struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev); 323 struct ibmvtpm_crq crq; 324 u64 *buf = (u64 *) &crq; 325 int rc = 0; 326 327 crq.valid = (u8)IBMVTPM_VALID_CMD; 328 crq.msg = (u8)VTPM_PREPARE_TO_SUSPEND; 329 330 rc = ibmvtpm_send_crq(ibmvtpm->vdev, buf[0], buf[1]); 331 if (rc != H_SUCCESS) 332 dev_err(ibmvtpm->dev, 333 "tpm_ibmvtpm_suspend failed rc=%d\n", rc); 334 335 return rc; 336 } 337 338 /** 339 * ibmvtpm_reset_crq - Reset CRQ 340 * @ibmvtpm: ibm vtpm struct 341 * 342 * Return value: 343 * 0 - Success 344 * Non-zero - Failure 345 */ 346 static int ibmvtpm_reset_crq(struct ibmvtpm_dev *ibmvtpm) 347 { 348 int rc = 0; 349 350 do { 351 if (rc) 352 msleep(100); 353 rc = plpar_hcall_norets(H_FREE_CRQ, 354 ibmvtpm->vdev->unit_address); 355 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 356 357 memset(ibmvtpm->crq_queue.crq_addr, 0, CRQ_RES_BUF_SIZE); 358 ibmvtpm->crq_queue.index = 0; 359 360 return plpar_hcall_norets(H_REG_CRQ, ibmvtpm->vdev->unit_address, 361 ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE); 362 } 363 364 /** 365 * tpm_ibmvtpm_resume - Resume from suspend 366 * @dev: device struct 367 * 368 * Return value: 369 * 0 370 */ 371 static int tpm_ibmvtpm_resume(struct device *dev) 372 { 373 struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev); 374 int rc = 0; 375 376 do { 377 if (rc) 378 msleep(100); 379 rc = plpar_hcall_norets(H_ENABLE_CRQ, 380 ibmvtpm->vdev->unit_address); 381 } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc)); 382 383 if (rc) { 384 dev_err(dev, "Error enabling ibmvtpm rc=%d\n", rc); 385 return rc; 386 } 387 388 rc = vio_enable_interrupts(ibmvtpm->vdev); 389 if (rc) { 390 dev_err(dev, "Error vio_enable_interrupts rc=%d\n", rc); 391 return rc; 392 } 393 394 rc = ibmvtpm_crq_send_init(ibmvtpm); 395 if (rc) 396 dev_err(dev, "Error send_init rc=%d\n", rc); 397 398 return rc; 399 } 400 401 static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status) 402 { 403 return (status == 0); 404 } 405 406 static const struct tpm_class_ops tpm_ibmvtpm = { 407 .recv = tpm_ibmvtpm_recv, 408 .send = tpm_ibmvtpm_send, 409 .cancel = tpm_ibmvtpm_cancel, 410 .status = tpm_ibmvtpm_status, 411 .req_complete_mask = 0, 412 .req_complete_val = 0, 413 .req_canceled = tpm_ibmvtpm_req_canceled, 414 }; 415 416 static const struct dev_pm_ops tpm_ibmvtpm_pm_ops = { 417 .suspend = tpm_ibmvtpm_suspend, 418 .resume = tpm_ibmvtpm_resume, 419 }; 420 421 /** 422 * ibmvtpm_crq_get_next - Get next responded crq 423 * @ibmvtpm vtpm device struct 424 * 425 * Return value: 426 * vtpm crq pointer 427 */ 428 static struct ibmvtpm_crq *ibmvtpm_crq_get_next(struct ibmvtpm_dev *ibmvtpm) 429 { 430 struct ibmvtpm_crq_queue *crq_q = &ibmvtpm->crq_queue; 431 struct ibmvtpm_crq *crq = &crq_q->crq_addr[crq_q->index]; 432 433 if (crq->valid & VTPM_MSG_RES) { 434 if (++crq_q->index == crq_q->num_entry) 435 crq_q->index = 0; 436 smp_rmb(); 437 } else 438 crq = NULL; 439 return crq; 440 } 441 442 /** 443 * ibmvtpm_crq_process - Process responded crq 444 * @crq crq to be processed 445 * @ibmvtpm vtpm device struct 446 * 447 * Return value: 448 * Nothing 449 */ 450 static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq, 451 struct ibmvtpm_dev *ibmvtpm) 452 { 453 int rc = 0; 454 455 switch (crq->valid) { 456 case VALID_INIT_CRQ: 457 switch (crq->msg) { 458 case INIT_CRQ_RES: 459 dev_info(ibmvtpm->dev, "CRQ initialized\n"); 460 rc = ibmvtpm_crq_send_init_complete(ibmvtpm); 461 if (rc) 462 dev_err(ibmvtpm->dev, "Unable to send CRQ init complete rc=%d\n", rc); 463 return; 464 case INIT_CRQ_COMP_RES: 465 dev_info(ibmvtpm->dev, 466 "CRQ initialization completed\n"); 467 return; 468 default: 469 dev_err(ibmvtpm->dev, "Unknown crq message type: %d\n", crq->msg); 470 return; 471 } 472 case IBMVTPM_VALID_CMD: 473 switch (crq->msg) { 474 case VTPM_GET_RTCE_BUFFER_SIZE_RES: 475 if (crq->len <= 0) { 476 dev_err(ibmvtpm->dev, "Invalid rtce size\n"); 477 return; 478 } 479 ibmvtpm->rtce_size = crq->len; 480 ibmvtpm->rtce_buf = kmalloc(ibmvtpm->rtce_size, 481 GFP_KERNEL); 482 if (!ibmvtpm->rtce_buf) { 483 dev_err(ibmvtpm->dev, "Failed to allocate memory for rtce buffer\n"); 484 return; 485 } 486 487 ibmvtpm->rtce_dma_handle = dma_map_single(ibmvtpm->dev, 488 ibmvtpm->rtce_buf, ibmvtpm->rtce_size, 489 DMA_BIDIRECTIONAL); 490 491 if (dma_mapping_error(ibmvtpm->dev, 492 ibmvtpm->rtce_dma_handle)) { 493 kfree(ibmvtpm->rtce_buf); 494 ibmvtpm->rtce_buf = NULL; 495 dev_err(ibmvtpm->dev, "Failed to dma map rtce buffer\n"); 496 } 497 498 return; 499 case VTPM_GET_VERSION_RES: 500 ibmvtpm->vtpm_version = crq->data; 501 return; 502 case VTPM_TPM_COMMAND_RES: 503 /* len of the data in rtce buffer */ 504 ibmvtpm->res_len = crq->len; 505 wake_up_interruptible(&ibmvtpm->wq); 506 return; 507 default: 508 return; 509 } 510 } 511 return; 512 } 513 514 /** 515 * ibmvtpm_interrupt - Interrupt handler 516 * @irq: irq number to handle 517 * @vtpm_instance: vtpm that received interrupt 518 * 519 * Returns: 520 * IRQ_HANDLED 521 **/ 522 static irqreturn_t ibmvtpm_interrupt(int irq, void *vtpm_instance) 523 { 524 struct ibmvtpm_dev *ibmvtpm = (struct ibmvtpm_dev *) vtpm_instance; 525 struct ibmvtpm_crq *crq; 526 527 /* while loop is needed for initial setup (get version and 528 * get rtce_size). There should be only one tpm request at any 529 * given time. 530 */ 531 while ((crq = ibmvtpm_crq_get_next(ibmvtpm)) != NULL) { 532 ibmvtpm_crq_process(crq, ibmvtpm); 533 crq->valid = 0; 534 smp_wmb(); 535 } 536 537 return IRQ_HANDLED; 538 } 539 540 /** 541 * tpm_ibmvtpm_probe - ibm vtpm initialize entry point 542 * @vio_dev: vio device struct 543 * @id: vio device id struct 544 * 545 * Return value: 546 * 0 - Success 547 * Non-zero - Failure 548 */ 549 static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev, 550 const struct vio_device_id *id) 551 { 552 struct ibmvtpm_dev *ibmvtpm; 553 struct device *dev = &vio_dev->dev; 554 struct ibmvtpm_crq_queue *crq_q; 555 struct tpm_chip *chip; 556 int rc = -ENOMEM, rc1; 557 558 chip = tpm_register_hardware(dev, &tpm_ibmvtpm); 559 if (!chip) { 560 dev_err(dev, "tpm_register_hardware failed\n"); 561 return -ENODEV; 562 } 563 564 ibmvtpm = kzalloc(sizeof(struct ibmvtpm_dev), GFP_KERNEL); 565 if (!ibmvtpm) { 566 dev_err(dev, "kzalloc for ibmvtpm failed\n"); 567 goto cleanup; 568 } 569 570 crq_q = &ibmvtpm->crq_queue; 571 crq_q->crq_addr = (struct ibmvtpm_crq *)get_zeroed_page(GFP_KERNEL); 572 if (!crq_q->crq_addr) { 573 dev_err(dev, "Unable to allocate memory for crq_addr\n"); 574 goto cleanup; 575 } 576 577 crq_q->num_entry = CRQ_RES_BUF_SIZE / sizeof(*crq_q->crq_addr); 578 ibmvtpm->crq_dma_handle = dma_map_single(dev, crq_q->crq_addr, 579 CRQ_RES_BUF_SIZE, 580 DMA_BIDIRECTIONAL); 581 582 if (dma_mapping_error(dev, ibmvtpm->crq_dma_handle)) { 583 dev_err(dev, "dma mapping failed\n"); 584 goto cleanup; 585 } 586 587 rc = plpar_hcall_norets(H_REG_CRQ, vio_dev->unit_address, 588 ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE); 589 if (rc == H_RESOURCE) 590 rc = ibmvtpm_reset_crq(ibmvtpm); 591 592 if (rc) { 593 dev_err(dev, "Unable to register CRQ rc=%d\n", rc); 594 goto reg_crq_cleanup; 595 } 596 597 rc = request_irq(vio_dev->irq, ibmvtpm_interrupt, 0, 598 tpm_ibmvtpm_driver_name, ibmvtpm); 599 if (rc) { 600 dev_err(dev, "Error %d register irq 0x%x\n", rc, vio_dev->irq); 601 goto init_irq_cleanup; 602 } 603 604 rc = vio_enable_interrupts(vio_dev); 605 if (rc) { 606 dev_err(dev, "Error %d enabling interrupts\n", rc); 607 goto init_irq_cleanup; 608 } 609 610 init_waitqueue_head(&ibmvtpm->wq); 611 612 crq_q->index = 0; 613 614 ibmvtpm->dev = dev; 615 ibmvtpm->vdev = vio_dev; 616 TPM_VPRIV(chip) = (void *)ibmvtpm; 617 618 spin_lock_init(&ibmvtpm->rtce_lock); 619 620 rc = ibmvtpm_crq_send_init(ibmvtpm); 621 if (rc) 622 goto init_irq_cleanup; 623 624 rc = ibmvtpm_crq_get_version(ibmvtpm); 625 if (rc) 626 goto init_irq_cleanup; 627 628 rc = ibmvtpm_crq_get_rtce_size(ibmvtpm); 629 if (rc) 630 goto init_irq_cleanup; 631 632 return rc; 633 init_irq_cleanup: 634 do { 635 rc1 = plpar_hcall_norets(H_FREE_CRQ, vio_dev->unit_address); 636 } while (rc1 == H_BUSY || H_IS_LONG_BUSY(rc1)); 637 reg_crq_cleanup: 638 dma_unmap_single(dev, ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE, 639 DMA_BIDIRECTIONAL); 640 cleanup: 641 if (ibmvtpm) { 642 if (crq_q->crq_addr) 643 free_page((unsigned long)crq_q->crq_addr); 644 kfree(ibmvtpm); 645 } 646 647 tpm_remove_hardware(dev); 648 649 return rc; 650 } 651 652 static struct vio_driver ibmvtpm_driver = { 653 .id_table = tpm_ibmvtpm_device_table, 654 .probe = tpm_ibmvtpm_probe, 655 .remove = tpm_ibmvtpm_remove, 656 .get_desired_dma = tpm_ibmvtpm_get_desired_dma, 657 .name = tpm_ibmvtpm_driver_name, 658 .pm = &tpm_ibmvtpm_pm_ops, 659 }; 660 661 /** 662 * ibmvtpm_module_init - Initialize ibm vtpm module 663 * 664 * Return value: 665 * 0 -Success 666 * Non-zero - Failure 667 */ 668 static int __init ibmvtpm_module_init(void) 669 { 670 return vio_register_driver(&ibmvtpm_driver); 671 } 672 673 /** 674 * ibmvtpm_module_exit - Teardown ibm vtpm module 675 * 676 * Return value: 677 * Nothing 678 */ 679 static void __exit ibmvtpm_module_exit(void) 680 { 681 vio_unregister_driver(&ibmvtpm_driver); 682 } 683 684 module_init(ibmvtpm_module_init); 685 module_exit(ibmvtpm_module_exit); 686 687 MODULE_AUTHOR("adlai@us.ibm.com"); 688 MODULE_DESCRIPTION("IBM vTPM Driver"); 689 MODULE_VERSION("1.0"); 690 MODULE_LICENSE("GPL"); 691