1// SPDX-License-Identifier: GPL-2.0-or-later 2 /****************************************************************************** 3 * Nuvoton TPM I2C Device Driver Interface for WPCT301/NPCT501/NPCT6XX, 4 * based on the TCG TPM Interface Spec version 1.2. 5 * Specifications at www.trustedcomputinggroup.org 6 * 7 * Copyright (C) 2011, Nuvoton Technology Corporation. 8 * Dan Morav <dan.morav@nuvoton.com> 9 * Copyright (C) 2013, Obsidian Research Corp. 10 * Jason Gunthorpe <jgunthorpe@obsidianresearch.com> 11 * 12 * Nuvoton contact information: APC.Support@nuvoton.com 13 *****************************************************************************/ 14 15#include <linux/init.h> 16#include <linux/module.h> 17#include <linux/moduleparam.h> 18#include <linux/slab.h> 19#include <linux/interrupt.h> 20#include <linux/wait.h> 21#include <linux/i2c.h> 22#include <linux/of.h> 23#include <linux/property.h> 24#include "tpm.h" 25 26/* I2C interface offsets */ 27#define TPM_STS 0x00 28#define TPM_BURST_COUNT 0x01 29#define TPM_DATA_FIFO_W 0x20 30#define TPM_DATA_FIFO_R 0x40 31#define TPM_VID_DID_RID 0x60 32#define TPM_I2C_RETRIES 5 33/* 34 * I2C bus device maximum buffer size w/o counting I2C address or command 35 * i.e. max size required for I2C write is 34 = addr, command, 32 bytes data 36 */ 37#define TPM_I2C_MAX_BUF_SIZE 32 38#define TPM_I2C_RETRY_COUNT 32 39#define TPM_I2C_BUS_DELAY 1000 /* usec */ 40#define TPM_I2C_RETRY_DELAY_SHORT (2 * 1000) /* usec */ 41#define TPM_I2C_RETRY_DELAY_LONG (10 * 1000) /* usec */ 42#define TPM_I2C_DELAY_RANGE 300 /* usec */ 43 44#define OF_IS_TPM2 ((void *)1) 45#define I2C_IS_TPM2 1 46 47struct priv_data { 48 int irq; 49 unsigned int intrs; 50 wait_queue_head_t read_queue; 51}; 52 53static s32 i2c_nuvoton_read_buf(struct i2c_client *client, u8 offset, u8 size, 54 u8 *data) 55{ 56 s32 status; 57 58 status = i2c_smbus_read_i2c_block_data(client, offset, size, data); 59 dev_dbg(&client->dev, 60 "%s(offset=%u size=%u data=%*ph) -> sts=%d\n", __func__, 61 offset, size, (int)size, data, status); 62 return status; 63} 64 65static s32 i2c_nuvoton_write_buf(struct i2c_client *client, u8 offset, u8 size, 66 u8 *data) 67{ 68 s32 status; 69 70 status = i2c_smbus_write_i2c_block_data(client, offset, size, data); 71 dev_dbg(&client->dev, 72 "%s(offset=%u size=%u data=%*ph) -> sts=%d\n", __func__, 73 offset, size, (int)size, data, status); 74 return status; 75} 76 77#define TPM_STS_VALID 0x80 78#define TPM_STS_COMMAND_READY 0x40 79#define TPM_STS_GO 0x20 80#define TPM_STS_DATA_AVAIL 0x10 81#define TPM_STS_EXPECT 0x08 82#define TPM_STS_RESPONSE_RETRY 0x02 83#define TPM_STS_ERR_VAL 0x07 /* bit2...bit0 reads always 0 */ 84 85#define TPM_I2C_SHORT_TIMEOUT 750 /* ms */ 86#define TPM_I2C_LONG_TIMEOUT 2000 /* 2 sec */ 87 88/* read TPM_STS register */ 89static u8 i2c_nuvoton_read_status(struct tpm_chip *chip) 90{ 91 struct i2c_client *client = to_i2c_client(chip->dev.parent); 92 s32 status; 93 u8 data; 94 95 status = i2c_nuvoton_read_buf(client, TPM_STS, 1, &data); 96 if (status <= 0) { 97 dev_err(&chip->dev, "%s() error return %d\n", __func__, 98 status); 99 data = TPM_STS_ERR_VAL; 100 } 101 102 return data; 103} 104 105/* write byte to TPM_STS register */ 106static s32 i2c_nuvoton_write_status(struct i2c_client *client, u8 data) 107{ 108 s32 status; 109 int i; 110 111 /* this causes the current command to be aborted */ 112 for (i = 0, status = -1; i < TPM_I2C_RETRY_COUNT && status < 0; i++) { 113 status = i2c_nuvoton_write_buf(client, TPM_STS, 1, &data); 114 if (status < 0) 115 usleep_range(TPM_I2C_BUS_DELAY, TPM_I2C_BUS_DELAY 116 + TPM_I2C_DELAY_RANGE); 117 } 118 return status; 119} 120 121/* write commandReady to TPM_STS register */ 122static void i2c_nuvoton_ready(struct tpm_chip *chip) 123{ 124 struct i2c_client *client = to_i2c_client(chip->dev.parent); 125 s32 status; 126 127 /* this causes the current command to be aborted */ 128 status = i2c_nuvoton_write_status(client, TPM_STS_COMMAND_READY); 129 if (status < 0) 130 dev_err(&chip->dev, 131 "%s() fail to write TPM_STS.commandReady\n", __func__); 132} 133 134/* read burstCount field from TPM_STS register 135 * return -1 on fail to read */ 136static int i2c_nuvoton_get_burstcount(struct i2c_client *client, 137 struct tpm_chip *chip) 138{ 139 unsigned long stop = jiffies + chip->timeout_d; 140 s32 status; 141 int burst_count = -1; 142 u8 data; 143 144 /* wait for burstcount to be non-zero */ 145 do { 146 /* in I2C burstCount is 1 byte */ 147 status = i2c_nuvoton_read_buf(client, TPM_BURST_COUNT, 1, 148 &data); 149 if (status > 0 && data > 0) { 150 burst_count = min_t(u8, TPM_I2C_MAX_BUF_SIZE, data); 151 break; 152 } 153 usleep_range(TPM_I2C_BUS_DELAY, TPM_I2C_BUS_DELAY 154 + TPM_I2C_DELAY_RANGE); 155 } while (time_before(jiffies, stop)); 156 157 return burst_count; 158} 159 160/* 161 * WPCT301/NPCT501/NPCT6XX SINT# supports only dataAvail 162 * any call to this function which is not waiting for dataAvail will 163 * set queue to NULL to avoid waiting for interrupt 164 */ 165static bool i2c_nuvoton_check_status(struct tpm_chip *chip, u8 mask, u8 value) 166{ 167 u8 status = i2c_nuvoton_read_status(chip); 168 return (status != TPM_STS_ERR_VAL) && ((status & mask) == value); 169} 170 171static int i2c_nuvoton_wait_for_stat(struct tpm_chip *chip, u8 mask, u8 value, 172 u32 timeout, wait_queue_head_t *queue) 173{ 174 if ((chip->flags & TPM_CHIP_FLAG_IRQ) && queue) { 175 s32 rc; 176 struct priv_data *priv = dev_get_drvdata(&chip->dev); 177 unsigned int cur_intrs = priv->intrs; 178 179 enable_irq(priv->irq); 180 rc = wait_event_interruptible_timeout(*queue, 181 cur_intrs != priv->intrs, 182 timeout); 183 if (rc > 0) 184 return 0; 185 /* At this point we know that the SINT pin is asserted, so we 186 * do not need to do i2c_nuvoton_check_status */ 187 } else { 188 unsigned long ten_msec, stop; 189 bool status_valid; 190 191 /* check current status */ 192 status_valid = i2c_nuvoton_check_status(chip, mask, value); 193 if (status_valid) 194 return 0; 195 196 /* use polling to wait for the event */ 197 ten_msec = jiffies + usecs_to_jiffies(TPM_I2C_RETRY_DELAY_LONG); 198 stop = jiffies + timeout; 199 do { 200 if (time_before(jiffies, ten_msec)) 201 usleep_range(TPM_I2C_RETRY_DELAY_SHORT, 202 TPM_I2C_RETRY_DELAY_SHORT 203 + TPM_I2C_DELAY_RANGE); 204 else 205 usleep_range(TPM_I2C_RETRY_DELAY_LONG, 206 TPM_I2C_RETRY_DELAY_LONG 207 + TPM_I2C_DELAY_RANGE); 208 status_valid = i2c_nuvoton_check_status(chip, mask, 209 value); 210 if (status_valid) 211 return 0; 212 } while (time_before(jiffies, stop)); 213 } 214 dev_err(&chip->dev, "%s(%02x, %02x) -> timeout\n", __func__, mask, 215 value); 216 return -ETIMEDOUT; 217} 218 219/* wait for dataAvail field to be set in the TPM_STS register */ 220static int i2c_nuvoton_wait_for_data_avail(struct tpm_chip *chip, u32 timeout, 221 wait_queue_head_t *queue) 222{ 223 return i2c_nuvoton_wait_for_stat(chip, 224 TPM_STS_DATA_AVAIL | TPM_STS_VALID, 225 TPM_STS_DATA_AVAIL | TPM_STS_VALID, 226 timeout, queue); 227} 228 229/* Read @count bytes into @buf from TPM_RD_FIFO register */ 230static int i2c_nuvoton_recv_data(struct i2c_client *client, 231 struct tpm_chip *chip, u8 *buf, size_t count) 232{ 233 struct priv_data *priv = dev_get_drvdata(&chip->dev); 234 s32 rc; 235 int burst_count, bytes2read, size = 0; 236 237 while (size < count && 238 i2c_nuvoton_wait_for_data_avail(chip, 239 chip->timeout_c, 240 &priv->read_queue) == 0) { 241 burst_count = i2c_nuvoton_get_burstcount(client, chip); 242 if (burst_count < 0) { 243 dev_err(&chip->dev, 244 "%s() fail to read burstCount=%d\n", __func__, 245 burst_count); 246 return -EIO; 247 } 248 bytes2read = min_t(size_t, burst_count, count - size); 249 rc = i2c_nuvoton_read_buf(client, TPM_DATA_FIFO_R, 250 bytes2read, &buf[size]); 251 if (rc < 0) { 252 dev_err(&chip->dev, 253 "%s() fail on i2c_nuvoton_read_buf()=%d\n", 254 __func__, rc); 255 return -EIO; 256 } 257 dev_dbg(&chip->dev, "%s(%d):", __func__, bytes2read); 258 size += bytes2read; 259 } 260 261 return size; 262} 263 264/* Read TPM command results */ 265static int i2c_nuvoton_recv(struct tpm_chip *chip, u8 *buf, size_t count) 266{ 267 struct priv_data *priv = dev_get_drvdata(&chip->dev); 268 struct device *dev = chip->dev.parent; 269 struct i2c_client *client = to_i2c_client(dev); 270 s32 rc; 271 int status; 272 int burst_count; 273 int retries; 274 int size = 0; 275 u32 expected; 276 277 if (count < TPM_HEADER_SIZE) { 278 i2c_nuvoton_ready(chip); /* return to idle */ 279 dev_err(dev, "%s() count < header size\n", __func__); 280 return -EIO; 281 } 282 for (retries = 0; retries < TPM_I2C_RETRIES; retries++) { 283 if (retries > 0) { 284 /* if this is not the first trial, set responseRetry */ 285 i2c_nuvoton_write_status(client, 286 TPM_STS_RESPONSE_RETRY); 287 } 288 /* 289 * read first available (> 10 bytes), including: 290 * tag, paramsize, and result 291 */ 292 status = i2c_nuvoton_wait_for_data_avail( 293 chip, chip->timeout_c, &priv->read_queue); 294 if (status != 0) { 295 dev_err(dev, "%s() timeout on dataAvail\n", __func__); 296 size = -ETIMEDOUT; 297 continue; 298 } 299 burst_count = i2c_nuvoton_get_burstcount(client, chip); 300 if (burst_count < 0) { 301 dev_err(dev, "%s() fail to get burstCount\n", __func__); 302 size = -EIO; 303 continue; 304 } 305 size = i2c_nuvoton_recv_data(client, chip, buf, 306 burst_count); 307 if (size < TPM_HEADER_SIZE) { 308 dev_err(dev, "%s() fail to read header\n", __func__); 309 size = -EIO; 310 continue; 311 } 312 /* 313 * convert number of expected bytes field from big endian 32 bit 314 * to machine native 315 */ 316 expected = be32_to_cpu(*(__be32 *) (buf + 2)); 317 if (expected > count || expected < size) { 318 dev_err(dev, "%s() expected > count\n", __func__); 319 size = -EIO; 320 continue; 321 } 322 rc = i2c_nuvoton_recv_data(client, chip, &buf[size], 323 expected - size); 324 size += rc; 325 if (rc < 0 || size < expected) { 326 dev_err(dev, "%s() fail to read remainder of result\n", 327 __func__); 328 size = -EIO; 329 continue; 330 } 331 if (i2c_nuvoton_wait_for_stat( 332 chip, TPM_STS_VALID | TPM_STS_DATA_AVAIL, 333 TPM_STS_VALID, chip->timeout_c, 334 NULL)) { 335 dev_err(dev, "%s() error left over data\n", __func__); 336 size = -ETIMEDOUT; 337 continue; 338 } 339 break; 340 } 341 i2c_nuvoton_ready(chip); 342 dev_dbg(&chip->dev, "%s() -> %d\n", __func__, size); 343 return size; 344} 345 346/* 347 * Send TPM command. 348 * 349 * If interrupts are used (signaled by an irq set in the vendor structure) 350 * tpm.c can skip polling for the data to be available as the interrupt is 351 * waited for here 352 */ 353static int i2c_nuvoton_send(struct tpm_chip *chip, u8 *buf, size_t len) 354{ 355 struct priv_data *priv = dev_get_drvdata(&chip->dev); 356 struct device *dev = chip->dev.parent; 357 struct i2c_client *client = to_i2c_client(dev); 358 u32 ordinal; 359 unsigned long duration; 360 size_t count = 0; 361 int burst_count, bytes2write, retries, rc = -EIO; 362 363 for (retries = 0; retries < TPM_RETRY; retries++) { 364 i2c_nuvoton_ready(chip); 365 if (i2c_nuvoton_wait_for_stat(chip, TPM_STS_COMMAND_READY, 366 TPM_STS_COMMAND_READY, 367 chip->timeout_b, NULL)) { 368 dev_err(dev, "%s() timeout on commandReady\n", 369 __func__); 370 rc = -EIO; 371 continue; 372 } 373 rc = 0; 374 while (count < len - 1) { 375 burst_count = i2c_nuvoton_get_burstcount(client, 376 chip); 377 if (burst_count < 0) { 378 dev_err(dev, "%s() fail get burstCount\n", 379 __func__); 380 rc = -EIO; 381 break; 382 } 383 bytes2write = min_t(size_t, burst_count, 384 len - 1 - count); 385 rc = i2c_nuvoton_write_buf(client, TPM_DATA_FIFO_W, 386 bytes2write, &buf[count]); 387 if (rc < 0) { 388 dev_err(dev, "%s() fail i2cWriteBuf\n", 389 __func__); 390 break; 391 } 392 dev_dbg(dev, "%s(%d):", __func__, bytes2write); 393 count += bytes2write; 394 rc = i2c_nuvoton_wait_for_stat(chip, 395 TPM_STS_VALID | 396 TPM_STS_EXPECT, 397 TPM_STS_VALID | 398 TPM_STS_EXPECT, 399 chip->timeout_c, 400 NULL); 401 if (rc < 0) { 402 dev_err(dev, "%s() timeout on Expect\n", 403 __func__); 404 rc = -ETIMEDOUT; 405 break; 406 } 407 } 408 if (rc < 0) 409 continue; 410 411 /* write last byte */ 412 rc = i2c_nuvoton_write_buf(client, TPM_DATA_FIFO_W, 1, 413 &buf[count]); 414 if (rc < 0) { 415 dev_err(dev, "%s() fail to write last byte\n", 416 __func__); 417 rc = -EIO; 418 continue; 419 } 420 dev_dbg(dev, "%s(last): %02x", __func__, buf[count]); 421 rc = i2c_nuvoton_wait_for_stat(chip, 422 TPM_STS_VALID | TPM_STS_EXPECT, 423 TPM_STS_VALID, 424 chip->timeout_c, NULL); 425 if (rc) { 426 dev_err(dev, "%s() timeout on Expect to clear\n", 427 __func__); 428 rc = -ETIMEDOUT; 429 continue; 430 } 431 break; 432 } 433 if (rc < 0) { 434 /* retries == TPM_RETRY */ 435 i2c_nuvoton_ready(chip); 436 return rc; 437 } 438 /* execute the TPM command */ 439 rc = i2c_nuvoton_write_status(client, TPM_STS_GO); 440 if (rc < 0) { 441 dev_err(dev, "%s() fail to write Go\n", __func__); 442 i2c_nuvoton_ready(chip); 443 return rc; 444 } 445 ordinal = be32_to_cpu(*((__be32 *) (buf + 6))); 446 duration = tpm_calc_ordinal_duration(chip, ordinal); 447 448 rc = i2c_nuvoton_wait_for_data_avail(chip, duration, &priv->read_queue); 449 if (rc) { 450 dev_err(dev, "%s() timeout command duration %ld\n", 451 __func__, duration); 452 i2c_nuvoton_ready(chip); 453 return rc; 454 } 455 456 dev_dbg(dev, "%s() -> %zd\n", __func__, len); 457 return 0; 458} 459 460static bool i2c_nuvoton_req_canceled(struct tpm_chip *chip, u8 status) 461{ 462 return (status == TPM_STS_COMMAND_READY); 463} 464 465static const struct tpm_class_ops tpm_i2c = { 466 .flags = TPM_OPS_AUTO_STARTUP, 467 .status = i2c_nuvoton_read_status, 468 .recv = i2c_nuvoton_recv, 469 .send = i2c_nuvoton_send, 470 .cancel = i2c_nuvoton_ready, 471 .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID, 472 .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID, 473 .req_canceled = i2c_nuvoton_req_canceled, 474}; 475 476/* The only purpose for the handler is to signal to any waiting threads that 477 * the interrupt is currently being asserted. The driver does not do any 478 * processing triggered by interrupts, and the chip provides no way to mask at 479 * the source (plus that would be slow over I2C). Run the IRQ as a one-shot, 480 * this means it cannot be shared. */ 481static irqreturn_t i2c_nuvoton_int_handler(int dummy, void *dev_id) 482{ 483 struct tpm_chip *chip = dev_id; 484 struct priv_data *priv = dev_get_drvdata(&chip->dev); 485 486 priv->intrs++; 487 wake_up(&priv->read_queue); 488 disable_irq_nosync(priv->irq); 489 return IRQ_HANDLED; 490} 491 492static int get_vid(struct i2c_client *client, u32 *res) 493{ 494 static const u8 vid_did_rid_value[] = { 0x50, 0x10, 0xfe }; 495 u32 temp; 496 s32 rc; 497 498 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 499 return -ENODEV; 500 rc = i2c_nuvoton_read_buf(client, TPM_VID_DID_RID, 4, (u8 *)&temp); 501 if (rc < 0) 502 return rc; 503 504 /* check WPCT301 values - ignore RID */ 505 if (memcmp(&temp, vid_did_rid_value, sizeof(vid_did_rid_value))) { 506 /* 507 * f/w rev 2.81 has an issue where the VID_DID_RID is not 508 * reporting the right value. so give it another chance at 509 * offset 0x20 (FIFO_W). 510 */ 511 rc = i2c_nuvoton_read_buf(client, TPM_DATA_FIFO_W, 4, 512 (u8 *) (&temp)); 513 if (rc < 0) 514 return rc; 515 516 /* check WPCT301 values - ignore RID */ 517 if (memcmp(&temp, vid_did_rid_value, 518 sizeof(vid_did_rid_value))) 519 return -ENODEV; 520 } 521 522 *res = temp; 523 return 0; 524} 525 526static int i2c_nuvoton_probe(struct i2c_client *client) 527{ 528 int rc; 529 struct tpm_chip *chip; 530 struct device *dev = &client->dev; 531 struct priv_data *priv; 532 u32 vid = 0; 533 534 rc = get_vid(client, &vid); 535 if (rc) 536 return rc; 537 538 dev_info(dev, "VID: %04X DID: %02X RID: %02X\n", (u16) vid, 539 (u8) (vid >> 16), (u8) (vid >> 24)); 540 541 chip = tpmm_chip_alloc(dev, &tpm_i2c); 542 if (IS_ERR(chip)) 543 return PTR_ERR(chip); 544 545 priv = devm_kzalloc(dev, sizeof(struct priv_data), GFP_KERNEL); 546 if (!priv) 547 return -ENOMEM; 548 549 if (i2c_get_match_data(client)) 550 chip->flags |= TPM_CHIP_FLAG_TPM2; 551 552 init_waitqueue_head(&priv->read_queue); 553 554 /* Default timeouts */ 555 chip->timeout_a = msecs_to_jiffies(TPM_I2C_SHORT_TIMEOUT); 556 chip->timeout_b = msecs_to_jiffies(TPM_I2C_LONG_TIMEOUT); 557 chip->timeout_c = msecs_to_jiffies(TPM_I2C_SHORT_TIMEOUT); 558 chip->timeout_d = msecs_to_jiffies(TPM_I2C_SHORT_TIMEOUT); 559 560 dev_set_drvdata(&chip->dev, priv); 561 562 /* 563 * I2C intfcaps (interrupt capabilitieis) in the chip are hard coded to: 564 * TPM_INTF_INT_LEVEL_LOW | TPM_INTF_DATA_AVAIL_INT 565 * The IRQ should be set in the i2c_board_info (which is done 566 * automatically in of_i2c_register_devices, for device tree users */ 567 priv->irq = client->irq; 568 if (client->irq) { 569 dev_dbg(dev, "%s() priv->irq\n", __func__); 570 rc = devm_request_irq(dev, client->irq, 571 i2c_nuvoton_int_handler, 572 IRQF_TRIGGER_LOW, 573 dev_name(&chip->dev), 574 chip); 575 if (rc) { 576 dev_err(dev, "%s() Unable to request irq: %d for use\n", 577 __func__, priv->irq); 578 priv->irq = 0; 579 } else { 580 chip->flags |= TPM_CHIP_FLAG_IRQ; 581 /* Clear any pending interrupt */ 582 i2c_nuvoton_ready(chip); 583 /* - wait for TPM_STS==0xA0 (stsValid, commandReady) */ 584 rc = i2c_nuvoton_wait_for_stat(chip, 585 TPM_STS_COMMAND_READY, 586 TPM_STS_COMMAND_READY, 587 chip->timeout_b, 588 NULL); 589 if (rc == 0) { 590 /* 591 * TIS is in ready state 592 * write dummy byte to enter reception state 593 * TPM_DATA_FIFO_W <- rc (0) 594 */ 595 rc = i2c_nuvoton_write_buf(client, 596 TPM_DATA_FIFO_W, 597 1, (u8 *) (&rc)); 598 if (rc < 0) 599 return rc; 600 /* TPM_STS <- 0x40 (commandReady) */ 601 i2c_nuvoton_ready(chip); 602 } else { 603 /* 604 * timeout_b reached - command was 605 * aborted. TIS should now be in idle state - 606 * only TPM_STS_VALID should be set 607 */ 608 if (i2c_nuvoton_read_status(chip) != 609 TPM_STS_VALID) 610 return -EIO; 611 } 612 } 613 } 614 615 return tpm_chip_register(chip); 616} 617 618static void i2c_nuvoton_remove(struct i2c_client *client) 619{ 620 struct tpm_chip *chip = i2c_get_clientdata(client); 621 622 tpm_chip_unregister(chip); 623} 624 625static const struct i2c_device_id i2c_nuvoton_id[] = { 626 {"tpm_i2c_nuvoton"}, 627 {"tpm2_i2c_nuvoton", .driver_data = I2C_IS_TPM2}, 628 {} 629}; 630MODULE_DEVICE_TABLE(i2c, i2c_nuvoton_id); 631 632#ifdef CONFIG_OF 633static const struct of_device_id i2c_nuvoton_of_match[] = { 634 {.compatible = "nuvoton,npct501"}, 635 {.compatible = "winbond,wpct301"}, 636 {.compatible = "nuvoton,npct601", .data = OF_IS_TPM2}, 637 {}, 638}; 639MODULE_DEVICE_TABLE(of, i2c_nuvoton_of_match); 640#endif 641 642static SIMPLE_DEV_PM_OPS(i2c_nuvoton_pm_ops, tpm_pm_suspend, tpm_pm_resume); 643 644static struct i2c_driver i2c_nuvoton_driver = { 645 .id_table = i2c_nuvoton_id, 646 .probe = i2c_nuvoton_probe, 647 .remove = i2c_nuvoton_remove, 648 .driver = { 649 .name = "tpm_i2c_nuvoton", 650 .pm = &i2c_nuvoton_pm_ops, 651 .of_match_table = of_match_ptr(i2c_nuvoton_of_match), 652 }, 653}; 654 655module_i2c_driver(i2c_nuvoton_driver); 656 657MODULE_AUTHOR("Dan Morav <dan.morav@nuvoton.com>"); 658MODULE_DESCRIPTION("Nuvoton TPM I2C Driver"); 659MODULE_LICENSE("GPL"); 660