1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Elan I2C/SMBus Touchpad driver 4 * 5 * Copyright (c) 2013 ELAN Microelectronics Corp. 6 * 7 * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw> 8 * Author: KT Liao <kt.liao@emc.com.tw> 9 * Version: 1.6.3 10 * 11 * Based on cyapa driver: 12 * copyright (c) 2011-2012 Cypress Semiconductor, Inc. 13 * copyright (c) 2011-2012 Google, Inc. 14 * 15 * Trademarks are the property of their respective owners. 16 */ 17 18 #include <linux/acpi.h> 19 #include <linux/delay.h> 20 #include <linux/device.h> 21 #include <linux/firmware.h> 22 #include <linux/i2c.h> 23 #include <linux/init.h> 24 #include <linux/input/mt.h> 25 #include <linux/interrupt.h> 26 #include <linux/irq.h> 27 #include <linux/module.h> 28 #include <linux/slab.h> 29 #include <linux/kernel.h> 30 #include <linux/sched.h> 31 #include <linux/string_choices.h> 32 #include <linux/input.h> 33 #include <linux/uaccess.h> 34 #include <linux/jiffies.h> 35 #include <linux/completion.h> 36 #include <linux/of.h> 37 #include <linux/pm_wakeirq.h> 38 #include <linux/property.h> 39 #include <linux/regulator/consumer.h> 40 #include <linux/unaligned.h> 41 42 #include "elan_i2c.h" 43 44 #define DRIVER_NAME "elan_i2c" 45 #define ELAN_VENDOR_ID 0x04f3 46 #define ETP_MAX_PRESSURE 255 47 #define ETP_FWIDTH_REDUCE 90 48 #define ETP_FINGER_WIDTH 15 49 #define ETP_RETRY_COUNT 3 50 51 /* quirks to control the device */ 52 #define ETP_QUIRK_QUICK_WAKEUP BIT(0) 53 54 /* The main device structure */ 55 struct elan_tp_data { 56 struct i2c_client *client; 57 struct input_dev *input; 58 struct input_dev *tp_input; /* trackpoint input node */ 59 struct regulator *vcc; 60 61 const struct elan_transport_ops *ops; 62 63 /* for fw update */ 64 struct completion fw_completion; 65 bool in_fw_update; 66 67 struct mutex sysfs_mutex; 68 69 unsigned int max_x; 70 unsigned int max_y; 71 unsigned int width_x; 72 unsigned int width_y; 73 unsigned int x_res; 74 unsigned int y_res; 75 76 u8 pattern; 77 u16 product_id; 78 u8 fw_version; 79 u8 sm_version; 80 u8 iap_version; 81 u16 fw_checksum; 82 unsigned int report_features; 83 unsigned int report_len; 84 int pressure_adjustment; 85 u8 mode; 86 u16 ic_type; 87 u16 fw_validpage_count; 88 u16 fw_page_size; 89 u32 fw_signature_address; 90 91 u8 min_baseline; 92 u8 max_baseline; 93 bool baseline_ready; 94 u8 clickpad; 95 bool middle_button; 96 97 u32 quirks; /* Various quirks */ 98 }; 99 100 static u32 elan_i2c_lookup_quirks(u16 ic_type, u16 product_id) 101 { 102 static const struct { 103 u16 ic_type; 104 u16 product_id; 105 u32 quirks; 106 } elan_i2c_quirks[] = { 107 { 0x0D, ETP_PRODUCT_ID_DELBIN, ETP_QUIRK_QUICK_WAKEUP }, 108 { 0x0D, ETP_PRODUCT_ID_WHITEBOX, ETP_QUIRK_QUICK_WAKEUP }, 109 { 0x10, ETP_PRODUCT_ID_VOXEL, ETP_QUIRK_QUICK_WAKEUP }, 110 { 0x14, ETP_PRODUCT_ID_MAGPIE, ETP_QUIRK_QUICK_WAKEUP }, 111 { 0x14, ETP_PRODUCT_ID_BOBBA, ETP_QUIRK_QUICK_WAKEUP }, 112 }; 113 u32 quirks = 0; 114 int i; 115 116 for (i = 0; i < ARRAY_SIZE(elan_i2c_quirks); i++) { 117 if (elan_i2c_quirks[i].ic_type == ic_type && 118 elan_i2c_quirks[i].product_id == product_id) { 119 quirks = elan_i2c_quirks[i].quirks; 120 } 121 } 122 123 if (ic_type >= 0x0D && product_id >= 0x123) 124 quirks |= ETP_QUIRK_QUICK_WAKEUP; 125 126 return quirks; 127 } 128 129 static int elan_get_fwinfo(u16 ic_type, u8 iap_version, u16 *validpage_count, 130 u32 *signature_address, u16 *page_size) 131 { 132 switch (ic_type) { 133 case 0x00: 134 case 0x06: 135 case 0x08: 136 *validpage_count = 512; 137 break; 138 case 0x03: 139 case 0x07: 140 case 0x09: 141 case 0x0A: 142 case 0x0B: 143 case 0x0C: 144 *validpage_count = 768; 145 break; 146 case 0x0D: 147 *validpage_count = 896; 148 break; 149 case 0x0E: 150 *validpage_count = 640; 151 break; 152 case 0x10: 153 *validpage_count = 1024; 154 break; 155 case 0x11: 156 *validpage_count = 1280; 157 break; 158 case 0x13: 159 *validpage_count = 2048; 160 break; 161 case 0x14: 162 case 0x15: 163 *validpage_count = 1024; 164 break; 165 case 0x19: 166 *validpage_count = 2032; 167 break; 168 default: 169 /* unknown ic type clear value */ 170 *validpage_count = 0; 171 *signature_address = 0; 172 *page_size = 0; 173 return -ENXIO; 174 } 175 176 *signature_address = 177 (*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE; 178 179 if ((ic_type == 0x14 || ic_type == 0x15) && iap_version >= 2) { 180 *validpage_count /= 8; 181 *page_size = ETP_FW_PAGE_SIZE_512; 182 } else if (ic_type >= 0x0D && iap_version >= 1) { 183 *validpage_count /= 2; 184 *page_size = ETP_FW_PAGE_SIZE_128; 185 } else { 186 *page_size = ETP_FW_PAGE_SIZE; 187 } 188 189 return 0; 190 } 191 192 static int elan_set_power(struct elan_tp_data *data, bool on) 193 { 194 int repeat = ETP_RETRY_COUNT; 195 int error; 196 197 do { 198 error = data->ops->power_control(data->client, on); 199 if (error >= 0) 200 return 0; 201 202 msleep(30); 203 } while (--repeat > 0); 204 205 dev_err(&data->client->dev, "failed to set power %s: %d\n", 206 str_on_off(on), error); 207 return error; 208 } 209 210 static int elan_sleep(struct elan_tp_data *data) 211 { 212 int repeat = ETP_RETRY_COUNT; 213 int error; 214 215 do { 216 error = data->ops->sleep_control(data->client, true); 217 if (!error) 218 return 0; 219 220 msleep(30); 221 } while (--repeat > 0); 222 223 return error; 224 } 225 226 static int elan_query_product(struct elan_tp_data *data) 227 { 228 int error; 229 230 error = data->ops->get_product_id(data->client, &data->product_id); 231 if (error) 232 return error; 233 234 error = data->ops->get_pattern(data->client, &data->pattern); 235 if (error) 236 return error; 237 238 error = data->ops->get_sm_version(data->client, data->pattern, 239 &data->ic_type, &data->sm_version, 240 &data->clickpad); 241 if (error) 242 return error; 243 244 return 0; 245 } 246 247 static int elan_check_ASUS_special_fw(struct elan_tp_data *data) 248 { 249 if (data->ic_type == 0x0E) { 250 switch (data->product_id) { 251 case 0x05 ... 0x07: 252 case 0x09: 253 case 0x13: 254 return true; 255 } 256 } else if (data->ic_type == 0x08 && data->product_id == 0x26) { 257 /* ASUS EeeBook X205TA */ 258 return true; 259 } 260 261 return false; 262 } 263 264 static int __elan_initialize(struct elan_tp_data *data, bool skip_reset) 265 { 266 struct i2c_client *client = data->client; 267 bool woken_up = false; 268 int error; 269 270 if (!skip_reset) { 271 error = data->ops->initialize(client); 272 if (error) { 273 dev_err(&client->dev, "device initialize failed: %d\n", error); 274 return error; 275 } 276 } 277 278 error = elan_query_product(data); 279 if (error) 280 return error; 281 282 /* 283 * Some ASUS devices were shipped with firmware that requires 284 * touchpads to be woken up first, before attempting to switch 285 * them into absolute reporting mode. 286 */ 287 if (elan_check_ASUS_special_fw(data)) { 288 error = data->ops->sleep_control(client, false); 289 if (error) { 290 dev_err(&client->dev, 291 "failed to wake device up: %d\n", error); 292 return error; 293 } 294 295 msleep(200); 296 woken_up = true; 297 } 298 299 data->mode |= ETP_ENABLE_ABS; 300 error = data->ops->set_mode(client, data->mode); 301 if (error) { 302 dev_err(&client->dev, 303 "failed to switch to absolute mode: %d\n", error); 304 return error; 305 } 306 307 if (!woken_up) { 308 error = data->ops->sleep_control(client, false); 309 if (error) { 310 dev_err(&client->dev, 311 "failed to wake device up: %d\n", error); 312 return error; 313 } 314 } 315 316 return 0; 317 } 318 319 static int elan_initialize(struct elan_tp_data *data, bool skip_reset) 320 { 321 int repeat = ETP_RETRY_COUNT; 322 int error; 323 324 do { 325 error = __elan_initialize(data, skip_reset); 326 if (!error) 327 return 0; 328 329 skip_reset = false; 330 msleep(30); 331 } while (--repeat > 0); 332 333 return error; 334 } 335 336 static int elan_query_device_info(struct elan_tp_data *data) 337 { 338 int error; 339 340 error = data->ops->get_version(data->client, data->pattern, false, 341 &data->fw_version); 342 if (error) 343 return error; 344 345 error = data->ops->get_checksum(data->client, false, 346 &data->fw_checksum); 347 if (error) 348 return error; 349 350 error = data->ops->get_version(data->client, data->pattern, 351 true, &data->iap_version); 352 if (error) 353 return error; 354 355 error = data->ops->get_pressure_adjustment(data->client, 356 &data->pressure_adjustment); 357 if (error) 358 return error; 359 360 error = data->ops->get_report_features(data->client, data->pattern, 361 &data->report_features, 362 &data->report_len); 363 if (error) 364 return error; 365 366 data->quirks = elan_i2c_lookup_quirks(data->ic_type, data->product_id); 367 368 error = elan_get_fwinfo(data->ic_type, data->iap_version, 369 &data->fw_validpage_count, 370 &data->fw_signature_address, 371 &data->fw_page_size); 372 if (error) 373 dev_warn(&data->client->dev, 374 "unexpected iap version %#04x (ic type: %#04x), firmware update will not work\n", 375 data->iap_version, data->ic_type); 376 377 return 0; 378 } 379 380 static unsigned int elan_convert_resolution(u8 val, u8 pattern) 381 { 382 /* 383 * pattern <= 0x01: 384 * (value from firmware) * 10 + 790 = dpi 385 * else 386 * ((value from firmware) + 3) * 100 = dpi 387 */ 388 int res = pattern <= 0x01 ? 389 (int)(char)val * 10 + 790 : ((int)(char)val + 3) * 100; 390 /* 391 * We also have to convert dpi to dots/mm (*10/254 to avoid floating 392 * point). 393 */ 394 return res * 10 / 254; 395 } 396 397 static int elan_query_device_parameters(struct elan_tp_data *data) 398 { 399 struct i2c_client *client = data->client; 400 unsigned int x_traces, y_traces; 401 u32 x_mm, y_mm; 402 u8 hw_x_res, hw_y_res; 403 int error; 404 405 if (device_property_read_u32(&client->dev, 406 "touchscreen-size-x", &data->max_x) || 407 device_property_read_u32(&client->dev, 408 "touchscreen-size-y", &data->max_y)) { 409 error = data->ops->get_max(data->client, 410 &data->max_x, 411 &data->max_y); 412 if (error) 413 return error; 414 } else { 415 /* size is the maximum + 1 */ 416 --data->max_x; 417 --data->max_y; 418 } 419 420 if (device_property_read_u32(&client->dev, 421 "elan,x_traces", 422 &x_traces) || 423 device_property_read_u32(&client->dev, 424 "elan,y_traces", 425 &y_traces)) { 426 error = data->ops->get_num_traces(data->client, 427 &x_traces, &y_traces); 428 if (error) 429 return error; 430 } 431 432 if (!x_traces || !y_traces) { 433 dev_warn(&client->dev, 434 "invalid trace numbers: x=%u, y=%u\n", 435 x_traces, y_traces); 436 data->width_x = 1; 437 data->width_y = 1; 438 } else { 439 data->width_x = data->max_x / x_traces; 440 data->width_y = data->max_y / y_traces; 441 } 442 443 if (device_property_read_u32(&client->dev, 444 "touchscreen-x-mm", &x_mm) || 445 device_property_read_u32(&client->dev, 446 "touchscreen-y-mm", &y_mm)) { 447 error = data->ops->get_resolution(data->client, 448 &hw_x_res, &hw_y_res); 449 if (error) 450 return error; 451 452 data->x_res = elan_convert_resolution(hw_x_res, data->pattern); 453 data->y_res = elan_convert_resolution(hw_y_res, data->pattern); 454 } else { 455 if (unlikely(x_mm == 0 || y_mm == 0)) { 456 dev_warn(&client->dev, 457 "invalid physical dimensions: x_mm=%u, y_mm=%u\n", 458 x_mm, y_mm); 459 data->x_res = 1; 460 data->y_res = 1; 461 } else { 462 data->x_res = (data->max_x + 1) / x_mm; 463 data->y_res = (data->max_y + 1) / y_mm; 464 } 465 } 466 467 if (device_property_read_bool(&client->dev, "elan,clickpad")) 468 data->clickpad = 1; 469 470 if (device_property_read_bool(&client->dev, "elan,middle-button")) 471 data->middle_button = true; 472 473 return 0; 474 } 475 476 /* 477 ********************************************************** 478 * IAP firmware updater related routines 479 ********************************************************** 480 */ 481 static int elan_write_fw_block(struct elan_tp_data *data, u16 page_size, 482 const u8 *page, u16 checksum, int idx) 483 { 484 int retry = ETP_RETRY_COUNT; 485 int error; 486 487 do { 488 error = data->ops->write_fw_block(data->client, page_size, 489 page, checksum, idx); 490 if (!error) 491 return 0; 492 493 dev_dbg(&data->client->dev, 494 "IAP retrying page %d (error: %d)\n", idx, error); 495 } while (--retry > 0); 496 497 return error; 498 } 499 500 static int __elan_update_firmware(struct elan_tp_data *data, 501 const struct firmware *fw) 502 { 503 struct i2c_client *client = data->client; 504 struct device *dev = &client->dev; 505 int i, j; 506 int error; 507 u16 iap_start_addr; 508 u16 boot_page_count; 509 u16 sw_checksum = 0, fw_checksum = 0; 510 511 error = data->ops->prepare_fw_update(client, data->ic_type, 512 data->iap_version, 513 data->fw_page_size); 514 if (error) 515 return error; 516 517 iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]); 518 519 boot_page_count = (iap_start_addr * 2) / data->fw_page_size; 520 for (i = boot_page_count; i < data->fw_validpage_count; i++) { 521 u16 checksum = 0; 522 const u8 *page = &fw->data[i * data->fw_page_size]; 523 524 for (j = 0; j < data->fw_page_size; j += 2) 525 checksum += ((page[j + 1] << 8) | page[j]); 526 527 error = elan_write_fw_block(data, data->fw_page_size, 528 page, checksum, i); 529 if (error) { 530 dev_err(dev, "write page %d fail: %d\n", i, error); 531 return error; 532 } 533 534 sw_checksum += checksum; 535 } 536 537 /* Wait WDT reset and power on reset */ 538 msleep(600); 539 540 error = data->ops->finish_fw_update(client, &data->fw_completion); 541 if (error) 542 return error; 543 544 error = data->ops->get_checksum(client, true, &fw_checksum); 545 if (error) 546 return error; 547 548 if (sw_checksum != fw_checksum) { 549 dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n", 550 sw_checksum, fw_checksum); 551 return -EIO; 552 } 553 554 return 0; 555 } 556 557 static int elan_update_firmware(struct elan_tp_data *data, 558 const struct firmware *fw) 559 { 560 struct i2c_client *client = data->client; 561 int retval; 562 563 dev_dbg(&client->dev, "Starting firmware update....\n"); 564 565 guard(disable_irq)(&client->irq); 566 567 data->in_fw_update = true; 568 569 retval = __elan_update_firmware(data, fw); 570 if (retval) { 571 dev_err(&client->dev, "firmware update failed: %d\n", retval); 572 data->ops->iap_reset(client); 573 } else { 574 /* Reinitialize TP after fw is updated */ 575 elan_initialize(data, false); 576 elan_query_device_info(data); 577 } 578 579 data->in_fw_update = false; 580 581 return retval; 582 } 583 584 /* 585 ******************************************************************* 586 * SYSFS attributes 587 ******************************************************************* 588 */ 589 static ssize_t elan_sysfs_read_fw_checksum(struct device *dev, 590 struct device_attribute *attr, 591 char *buf) 592 { 593 struct i2c_client *client = to_i2c_client(dev); 594 struct elan_tp_data *data = i2c_get_clientdata(client); 595 596 return sysfs_emit(buf, "0x%04x\n", data->fw_checksum); 597 } 598 599 static ssize_t elan_sysfs_read_product_id(struct device *dev, 600 struct device_attribute *attr, 601 char *buf) 602 { 603 struct i2c_client *client = to_i2c_client(dev); 604 struct elan_tp_data *data = i2c_get_clientdata(client); 605 606 return sysfs_emit(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n", 607 data->product_id); 608 } 609 610 static ssize_t elan_sysfs_read_fw_ver(struct device *dev, 611 struct device_attribute *attr, 612 char *buf) 613 { 614 struct i2c_client *client = to_i2c_client(dev); 615 struct elan_tp_data *data = i2c_get_clientdata(client); 616 617 return sysfs_emit(buf, "%d.0\n", data->fw_version); 618 } 619 620 static ssize_t elan_sysfs_read_sm_ver(struct device *dev, 621 struct device_attribute *attr, 622 char *buf) 623 { 624 struct i2c_client *client = to_i2c_client(dev); 625 struct elan_tp_data *data = i2c_get_clientdata(client); 626 627 return sysfs_emit(buf, "%d.0\n", data->sm_version); 628 } 629 630 static ssize_t elan_sysfs_read_iap_ver(struct device *dev, 631 struct device_attribute *attr, 632 char *buf) 633 { 634 struct i2c_client *client = to_i2c_client(dev); 635 struct elan_tp_data *data = i2c_get_clientdata(client); 636 637 return sysfs_emit(buf, "%d.0\n", data->iap_version); 638 } 639 640 static ssize_t elan_sysfs_update_fw(struct device *dev, 641 struct device_attribute *attr, 642 const char *buf, size_t count) 643 { 644 struct elan_tp_data *data = dev_get_drvdata(dev); 645 int error; 646 const u8 *fw_signature; 647 static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF}; 648 649 if (data->fw_validpage_count == 0) 650 return -EINVAL; 651 652 /* Look for a firmware with the product id appended. */ 653 const char *fw_name __free(kfree) = 654 kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id); 655 if (!fw_name) { 656 dev_err(dev, "failed to allocate memory for firmware name\n"); 657 return -ENOMEM; 658 } 659 660 dev_info(dev, "requesting fw '%s'\n", fw_name); 661 const struct firmware *fw __free(firmware) = NULL; 662 error = request_firmware(&fw, fw_name, dev); 663 if (error) { 664 dev_err(dev, "failed to request firmware: %d\n", error); 665 return error; 666 } 667 668 if (fw->size < data->fw_signature_address + sizeof(signature)) { 669 dev_err(dev, "firmware file too small\n"); 670 return -EBADF; 671 } 672 673 /* Firmware file must match signature data */ 674 fw_signature = &fw->data[data->fw_signature_address]; 675 if (memcmp(fw_signature, signature, sizeof(signature)) != 0) { 676 dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n", 677 (int)sizeof(signature), signature, 678 (int)sizeof(signature), fw_signature); 679 return -EBADF; 680 } 681 682 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) { 683 error = elan_update_firmware(data, fw); 684 if (error) 685 return error; 686 } 687 688 return count; 689 } 690 691 static int elan_calibrate(struct elan_tp_data *data) 692 { 693 struct i2c_client *client = data->client; 694 struct device *dev = &client->dev; 695 int tries = 20; 696 int retval; 697 int error; 698 u8 val[ETP_CALIBRATE_MAX_LEN]; 699 700 guard(disable_irq)(&client->irq); 701 702 data->mode |= ETP_ENABLE_CALIBRATE; 703 retval = data->ops->set_mode(client, data->mode); 704 if (retval) { 705 data->mode &= ~ETP_ENABLE_CALIBRATE; 706 dev_err(dev, "failed to enable calibration mode: %d\n", 707 retval); 708 return retval; 709 } 710 711 retval = data->ops->calibrate(client); 712 if (retval) { 713 dev_err(dev, "failed to start calibration: %d\n", 714 retval); 715 goto out_disable_calibrate; 716 } 717 718 val[0] = 0xff; 719 do { 720 /* Wait 250ms before checking if calibration has completed. */ 721 msleep(250); 722 723 retval = data->ops->calibrate_result(client, val); 724 if (retval) 725 dev_err(dev, "failed to check calibration result: %d\n", 726 retval); 727 else if (val[0] == 0) 728 break; /* calibration done */ 729 730 } while (--tries); 731 732 if (tries == 0) { 733 dev_err(dev, "failed to calibrate. Timeout.\n"); 734 retval = -ETIMEDOUT; 735 } 736 737 out_disable_calibrate: 738 data->mode &= ~ETP_ENABLE_CALIBRATE; 739 error = data->ops->set_mode(data->client, data->mode); 740 if (error) { 741 dev_err(dev, "failed to disable calibration mode: %d\n", 742 error); 743 if (!retval) 744 retval = error; 745 } 746 return retval; 747 } 748 749 static ssize_t calibrate_store(struct device *dev, 750 struct device_attribute *attr, 751 const char *buf, size_t count) 752 { 753 struct i2c_client *client = to_i2c_client(dev); 754 struct elan_tp_data *data = i2c_get_clientdata(client); 755 int error; 756 757 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) { 758 error = elan_calibrate(data); 759 if (error) 760 return error; 761 } 762 763 return count; 764 } 765 766 static ssize_t elan_sysfs_read_mode(struct device *dev, 767 struct device_attribute *attr, 768 char *buf) 769 { 770 struct i2c_client *client = to_i2c_client(dev); 771 struct elan_tp_data *data = i2c_get_clientdata(client); 772 int error; 773 enum tp_mode mode; 774 775 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) { 776 error = data->ops->iap_get_mode(data->client, &mode); 777 if (error) 778 return error; 779 } 780 781 return sysfs_emit(buf, "%d\n", (int)mode); 782 } 783 784 static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL); 785 static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL); 786 static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL); 787 static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL); 788 static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL); 789 static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL); 790 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw); 791 792 static DEVICE_ATTR_WO(calibrate); 793 794 static struct attribute *elan_sysfs_entries[] = { 795 &dev_attr_product_id.attr, 796 &dev_attr_firmware_version.attr, 797 &dev_attr_sample_version.attr, 798 &dev_attr_iap_version.attr, 799 &dev_attr_fw_checksum.attr, 800 &dev_attr_calibrate.attr, 801 &dev_attr_mode.attr, 802 &dev_attr_update_fw.attr, 803 NULL, 804 }; 805 806 static const struct attribute_group elan_sysfs_group = { 807 .attrs = elan_sysfs_entries, 808 }; 809 810 static int elan_acquire_baseline(struct elan_tp_data *data) 811 { 812 struct i2c_client *client = data->client; 813 struct device *dev = &client->dev; 814 int retval; 815 int error; 816 817 guard(disable_irq)(&client->irq); 818 819 data->baseline_ready = false; 820 821 data->mode |= ETP_ENABLE_CALIBRATE; 822 retval = data->ops->set_mode(client, data->mode); 823 if (retval) { 824 data->mode &= ~ETP_ENABLE_CALIBRATE; 825 dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n", 826 retval); 827 return retval; 828 } 829 830 msleep(250); 831 832 retval = data->ops->get_baseline_data(client, true, 833 &data->max_baseline); 834 if (retval) { 835 dev_err(dev, "Failed to read max baseline from device: %d\n", 836 retval); 837 goto out_disable_calibrate; 838 } 839 840 retval = data->ops->get_baseline_data(client, false, 841 &data->min_baseline); 842 if (retval) { 843 dev_err(dev, "Failed to read min baseline from device: %d\n", 844 retval); 845 goto out_disable_calibrate; 846 } 847 848 data->baseline_ready = true; 849 850 out_disable_calibrate: 851 data->mode &= ~ETP_ENABLE_CALIBRATE; 852 error = data->ops->set_mode(client, data->mode); 853 if (error) { 854 dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n", 855 error); 856 if (!retval) 857 retval = error; 858 } 859 860 return retval; 861 } 862 863 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr, 864 const char *buf, size_t count) 865 { 866 struct i2c_client *client = to_i2c_client(dev); 867 struct elan_tp_data *data = i2c_get_clientdata(client); 868 int error; 869 870 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) { 871 error = elan_acquire_baseline(data); 872 if (error) 873 return error; 874 } 875 876 return count; 877 } 878 879 static ssize_t min_show(struct device *dev, 880 struct device_attribute *attr, char *buf) 881 { 882 struct i2c_client *client = to_i2c_client(dev); 883 struct elan_tp_data *data = i2c_get_clientdata(client); 884 885 scoped_guard(mutex_intr, &data->sysfs_mutex) { 886 if (!data->baseline_ready) 887 return -ENODATA; 888 889 return sysfs_emit(buf, "%d", data->min_baseline); 890 } 891 892 return -EINTR; 893 } 894 895 static ssize_t max_show(struct device *dev, 896 struct device_attribute *attr, char *buf) 897 { 898 struct i2c_client *client = to_i2c_client(dev); 899 struct elan_tp_data *data = i2c_get_clientdata(client); 900 901 scoped_guard(mutex_intr, &data->sysfs_mutex) { 902 if (!data->baseline_ready) 903 return -ENODATA; 904 905 return sysfs_emit(buf, "%d", data->max_baseline); 906 } 907 908 return -EINTR; 909 } 910 911 static DEVICE_ATTR_WO(acquire); 912 static DEVICE_ATTR_RO(min); 913 static DEVICE_ATTR_RO(max); 914 915 static struct attribute *elan_baseline_sysfs_entries[] = { 916 &dev_attr_acquire.attr, 917 &dev_attr_min.attr, 918 &dev_attr_max.attr, 919 NULL, 920 }; 921 922 static const struct attribute_group elan_baseline_sysfs_group = { 923 .name = "baseline", 924 .attrs = elan_baseline_sysfs_entries, 925 }; 926 927 static const struct attribute_group *elan_sysfs_groups[] = { 928 &elan_sysfs_group, 929 &elan_baseline_sysfs_group, 930 NULL 931 }; 932 933 /* 934 ****************************************************************** 935 * Elan isr functions 936 ****************************************************************** 937 */ 938 static void elan_report_contact(struct elan_tp_data *data, int contact_num, 939 bool contact_valid, bool high_precision, 940 u8 *packet, u8 *finger_data) 941 { 942 struct input_dev *input = data->input; 943 unsigned int pos_x, pos_y; 944 unsigned int pressure, scaled_pressure; 945 946 if (contact_valid) { 947 if (high_precision) { 948 pos_x = get_unaligned_be16(&finger_data[0]); 949 pos_y = get_unaligned_be16(&finger_data[2]); 950 } else { 951 pos_x = ((finger_data[0] & 0xf0) << 4) | finger_data[1]; 952 pos_y = ((finger_data[0] & 0x0f) << 8) | finger_data[2]; 953 } 954 955 if (pos_x > data->max_x || pos_y > data->max_y) { 956 dev_dbg(input->dev.parent, 957 "[%d] x=%d y=%d over max (%d, %d)", 958 contact_num, pos_x, pos_y, 959 data->max_x, data->max_y); 960 return; 961 } 962 963 pressure = finger_data[4]; 964 scaled_pressure = pressure + data->pressure_adjustment; 965 if (scaled_pressure > ETP_MAX_PRESSURE) 966 scaled_pressure = ETP_MAX_PRESSURE; 967 968 input_mt_slot(input, contact_num); 969 input_mt_report_slot_state(input, MT_TOOL_FINGER, true); 970 input_report_abs(input, ABS_MT_POSITION_X, pos_x); 971 input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y); 972 input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure); 973 974 if (data->report_features & ETP_FEATURE_REPORT_MK) { 975 unsigned int mk_x, mk_y, area_x, area_y; 976 int adj_width_x, adj_width_y; 977 u8 mk_data = high_precision ? 978 packet[ETP_MK_DATA_OFFSET + contact_num] : 979 finger_data[3]; 980 981 mk_x = mk_data & 0x0f; 982 mk_y = mk_data >> 4; 983 984 /* 985 * To avoid treating large finger as palm, let's reduce 986 * the width x and y per trace. 987 */ 988 989 adj_width_x = data->width_x > ETP_FWIDTH_REDUCE ? 990 data->width_x - ETP_FWIDTH_REDUCE : 0; 991 adj_width_y = data->width_y > ETP_FWIDTH_REDUCE ? 992 data->width_y - ETP_FWIDTH_REDUCE : 0; 993 994 area_x = mk_x * adj_width_x; 995 area_y = mk_y * adj_width_y; 996 997 input_report_abs(input, ABS_TOOL_WIDTH, mk_x); 998 input_report_abs(input, ABS_MT_TOUCH_MAJOR, 999 max(area_x, area_y)); 1000 input_report_abs(input, ABS_MT_TOUCH_MINOR, 1001 min(area_x, area_y)); 1002 } 1003 } else { 1004 input_mt_slot(input, contact_num); 1005 input_mt_report_slot_inactive(input); 1006 } 1007 } 1008 1009 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet, 1010 bool high_precision) 1011 { 1012 struct input_dev *input = data->input; 1013 u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET]; 1014 int i; 1015 u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET]; 1016 u8 hover_info = packet[ETP_HOVER_INFO_OFFSET]; 1017 bool contact_valid, hover_event; 1018 1019 pm_wakeup_event(&data->client->dev, 0); 1020 1021 hover_event = hover_info & BIT(6); 1022 1023 for (i = 0; i < ETP_MAX_FINGERS; i++) { 1024 contact_valid = tp_info & BIT(3 + i); 1025 elan_report_contact(data, i, contact_valid, high_precision, 1026 packet, finger_data); 1027 if (contact_valid) 1028 finger_data += ETP_FINGER_DATA_LEN; 1029 } 1030 1031 input_report_key(input, BTN_LEFT, tp_info & BIT(0)); 1032 input_report_key(input, BTN_MIDDLE, tp_info & BIT(2)); 1033 input_report_key(input, BTN_RIGHT, tp_info & BIT(1)); 1034 input_report_abs(input, ABS_DISTANCE, hover_event != 0); 1035 input_mt_report_pointer_emulation(input, true); 1036 input_sync(input); 1037 } 1038 1039 static void elan_report_trackpoint(struct elan_tp_data *data, u8 *report) 1040 { 1041 struct input_dev *input = data->tp_input; 1042 u8 *packet = &report[ETP_REPORT_ID_OFFSET + 1]; 1043 int x, y; 1044 1045 pm_wakeup_event(&data->client->dev, 0); 1046 1047 if (!data->tp_input) { 1048 dev_warn_once(&data->client->dev, 1049 "received a trackpoint report while no trackpoint device has been created. Please report upstream.\n"); 1050 return; 1051 } 1052 1053 input_report_key(input, BTN_LEFT, packet[0] & 0x01); 1054 input_report_key(input, BTN_RIGHT, packet[0] & 0x02); 1055 input_report_key(input, BTN_MIDDLE, packet[0] & 0x04); 1056 1057 if ((packet[3] & 0x0F) == 0x06) { 1058 x = packet[4] - (int)((packet[1] ^ 0x80) << 1); 1059 y = (int)((packet[2] ^ 0x80) << 1) - packet[5]; 1060 1061 input_report_rel(input, REL_X, x); 1062 input_report_rel(input, REL_Y, y); 1063 } 1064 1065 input_sync(input); 1066 } 1067 1068 static irqreturn_t elan_isr(int irq, void *dev_id) 1069 { 1070 struct elan_tp_data *data = dev_id; 1071 int error; 1072 u8 report[ETP_MAX_REPORT_LEN]; 1073 1074 /* 1075 * When device is connected to i2c bus, when all IAP page writes 1076 * complete, the driver will receive interrupt and must read 1077 * 0000 to confirm that IAP is finished. 1078 */ 1079 if (data->in_fw_update) { 1080 complete(&data->fw_completion); 1081 goto out; 1082 } 1083 1084 error = data->ops->get_report(data->client, report, data->report_len); 1085 if (error) 1086 goto out; 1087 1088 switch (report[ETP_REPORT_ID_OFFSET]) { 1089 case ETP_REPORT_ID: 1090 elan_report_absolute(data, report, false); 1091 break; 1092 case ETP_REPORT_ID2: 1093 elan_report_absolute(data, report, true); 1094 break; 1095 case ETP_TP_REPORT_ID: 1096 case ETP_TP_REPORT_ID2: 1097 elan_report_trackpoint(data, report); 1098 break; 1099 default: 1100 dev_err(&data->client->dev, "invalid report id data (%x)\n", 1101 report[ETP_REPORT_ID_OFFSET]); 1102 } 1103 1104 out: 1105 return IRQ_HANDLED; 1106 } 1107 1108 /* 1109 ****************************************************************** 1110 * Elan initialization functions 1111 ****************************************************************** 1112 */ 1113 1114 static int elan_setup_trackpoint_input_device(struct elan_tp_data *data) 1115 { 1116 struct device *dev = &data->client->dev; 1117 struct input_dev *input; 1118 1119 input = devm_input_allocate_device(dev); 1120 if (!input) 1121 return -ENOMEM; 1122 1123 input->name = "Elan TrackPoint"; 1124 input->id.bustype = BUS_I2C; 1125 input->id.vendor = ELAN_VENDOR_ID; 1126 input->id.product = data->product_id; 1127 input_set_drvdata(input, data); 1128 1129 input_set_capability(input, EV_REL, REL_X); 1130 input_set_capability(input, EV_REL, REL_Y); 1131 input_set_capability(input, EV_KEY, BTN_LEFT); 1132 input_set_capability(input, EV_KEY, BTN_RIGHT); 1133 input_set_capability(input, EV_KEY, BTN_MIDDLE); 1134 1135 __set_bit(INPUT_PROP_POINTER, input->propbit); 1136 __set_bit(INPUT_PROP_POINTING_STICK, input->propbit); 1137 1138 data->tp_input = input; 1139 1140 return 0; 1141 } 1142 1143 static int elan_setup_input_device(struct elan_tp_data *data) 1144 { 1145 struct device *dev = &data->client->dev; 1146 struct input_dev *input; 1147 unsigned int max_width = max(data->width_x, data->width_y); 1148 unsigned int min_width = min(data->width_x, data->width_y); 1149 int error; 1150 1151 input = devm_input_allocate_device(dev); 1152 if (!input) 1153 return -ENOMEM; 1154 1155 input->name = "Elan Touchpad"; 1156 input->id.bustype = BUS_I2C; 1157 input->id.vendor = ELAN_VENDOR_ID; 1158 input->id.product = data->product_id; 1159 input_set_drvdata(input, data); 1160 1161 error = input_mt_init_slots(input, ETP_MAX_FINGERS, 1162 INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED); 1163 if (error) { 1164 dev_err(dev, "failed to initialize MT slots: %d\n", error); 1165 return error; 1166 } 1167 1168 __set_bit(EV_ABS, input->evbit); 1169 __set_bit(INPUT_PROP_POINTER, input->propbit); 1170 if (data->clickpad) { 1171 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit); 1172 } else { 1173 __set_bit(BTN_RIGHT, input->keybit); 1174 if (data->middle_button) 1175 __set_bit(BTN_MIDDLE, input->keybit); 1176 } 1177 __set_bit(BTN_LEFT, input->keybit); 1178 1179 /* Set up ST parameters */ 1180 input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0); 1181 input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0); 1182 input_abs_set_res(input, ABS_X, data->x_res); 1183 input_abs_set_res(input, ABS_Y, data->y_res); 1184 input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0); 1185 if (data->report_features & ETP_FEATURE_REPORT_MK) 1186 input_set_abs_params(input, ABS_TOOL_WIDTH, 1187 0, ETP_FINGER_WIDTH, 0, 0); 1188 input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0); 1189 1190 /* And MT parameters */ 1191 input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0); 1192 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0); 1193 input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res); 1194 input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res); 1195 input_set_abs_params(input, ABS_MT_PRESSURE, 0, 1196 ETP_MAX_PRESSURE, 0, 0); 1197 if (data->report_features & ETP_FEATURE_REPORT_MK) { 1198 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 1199 0, ETP_FINGER_WIDTH * max_width, 0, 0); 1200 input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 1201 0, ETP_FINGER_WIDTH * min_width, 0, 0); 1202 } 1203 1204 data->input = input; 1205 1206 return 0; 1207 } 1208 1209 static void elan_disable_regulator(void *_data) 1210 { 1211 struct elan_tp_data *data = _data; 1212 1213 regulator_disable(data->vcc); 1214 } 1215 1216 static int elan_probe(struct i2c_client *client) 1217 { 1218 const struct elan_transport_ops *transport_ops; 1219 struct device *dev = &client->dev; 1220 struct elan_tp_data *data; 1221 unsigned long irqflags; 1222 int error; 1223 1224 if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) && 1225 i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { 1226 transport_ops = &elan_i2c_ops; 1227 } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) && 1228 i2c_check_functionality(client->adapter, 1229 I2C_FUNC_SMBUS_BYTE_DATA | 1230 I2C_FUNC_SMBUS_BLOCK_DATA | 1231 I2C_FUNC_SMBUS_I2C_BLOCK)) { 1232 transport_ops = &elan_smbus_ops; 1233 } else { 1234 dev_err(dev, "not a supported I2C/SMBus adapter\n"); 1235 return -EIO; 1236 } 1237 1238 data = devm_kzalloc(dev, sizeof(struct elan_tp_data), GFP_KERNEL); 1239 if (!data) 1240 return -ENOMEM; 1241 1242 i2c_set_clientdata(client, data); 1243 1244 data->ops = transport_ops; 1245 data->client = client; 1246 init_completion(&data->fw_completion); 1247 mutex_init(&data->sysfs_mutex); 1248 1249 data->vcc = devm_regulator_get(dev, "vcc"); 1250 if (IS_ERR(data->vcc)) 1251 return dev_err_probe(dev, PTR_ERR(data->vcc), "Failed to get 'vcc' regulator\n"); 1252 1253 error = regulator_enable(data->vcc); 1254 if (error) { 1255 dev_err(dev, "Failed to enable regulator: %d\n", error); 1256 return error; 1257 } 1258 1259 error = devm_add_action_or_reset(dev, elan_disable_regulator, data); 1260 if (error) { 1261 dev_err(dev, "Failed to add disable regulator action: %d\n", 1262 error); 1263 return error; 1264 } 1265 1266 /* Make sure there is something at this address */ 1267 error = i2c_smbus_read_byte(client); 1268 if (error < 0) { 1269 dev_dbg(&client->dev, "nothing at this address: %d\n", error); 1270 return -ENXIO; 1271 } 1272 1273 /* Initialize the touchpad. */ 1274 error = elan_initialize(data, false); 1275 if (error) 1276 return error; 1277 1278 error = elan_query_device_info(data); 1279 if (error) 1280 return error; 1281 1282 error = elan_query_device_parameters(data); 1283 if (error) 1284 return error; 1285 1286 dev_info(dev, 1287 "Elan Touchpad: Module ID: 0x%04x, Firmware: 0x%04x, Sample: 0x%04x, IAP: 0x%04x\n", 1288 data->product_id, 1289 data->fw_version, 1290 data->sm_version, 1291 data->iap_version); 1292 1293 dev_dbg(dev, 1294 "Elan Touchpad Extra Information:\n" 1295 " Max ABS X,Y: %d,%d\n" 1296 " Width X,Y: %d,%d\n" 1297 " Resolution X,Y: %d,%d (dots/mm)\n" 1298 " ic type: 0x%x\n" 1299 " info pattern: 0x%x\n", 1300 data->max_x, data->max_y, 1301 data->width_x, data->width_y, 1302 data->x_res, data->y_res, 1303 data->ic_type, data->pattern); 1304 1305 /* Set up input device properties based on queried parameters. */ 1306 error = elan_setup_input_device(data); 1307 if (error) 1308 return error; 1309 1310 if (device_property_read_bool(&client->dev, "elan,trackpoint")) { 1311 error = elan_setup_trackpoint_input_device(data); 1312 if (error) 1313 return error; 1314 } 1315 1316 /* 1317 * Platform code (ACPI, DTS) should normally set up interrupt 1318 * for us, but in case it did not let's fall back to using falling 1319 * edge to be compatible with older Chromebooks. 1320 */ 1321 irqflags = irq_get_trigger_type(client->irq); 1322 if (!irqflags) 1323 irqflags = IRQF_TRIGGER_FALLING; 1324 1325 error = devm_request_threaded_irq(dev, client->irq, NULL, elan_isr, 1326 irqflags | IRQF_ONESHOT, 1327 client->name, data); 1328 if (error) { 1329 dev_err(dev, "cannot register irq=%d\n", client->irq); 1330 return error; 1331 } 1332 1333 error = input_register_device(data->input); 1334 if (error) { 1335 dev_err(dev, "failed to register input device: %d\n", error); 1336 return error; 1337 } 1338 1339 if (data->tp_input) { 1340 error = input_register_device(data->tp_input); 1341 if (error) { 1342 dev_err(&client->dev, 1343 "failed to register TrackPoint input device: %d\n", 1344 error); 1345 return error; 1346 } 1347 } 1348 1349 return 0; 1350 } 1351 1352 static int __elan_suspend(struct elan_tp_data *data) 1353 { 1354 struct i2c_client *client = data->client; 1355 int error; 1356 1357 if (device_may_wakeup(&client->dev)) 1358 return elan_sleep(data); 1359 1360 /* Touchpad is not a wakeup source */ 1361 error = elan_set_power(data, false); 1362 if (error) 1363 return error; 1364 1365 error = regulator_disable(data->vcc); 1366 if (error) { 1367 dev_err(&client->dev, 1368 "failed to disable regulator when suspending: %d\n", 1369 error); 1370 /* Attempt to power the chip back up */ 1371 elan_set_power(data, true); 1372 return error; 1373 } 1374 1375 return 0; 1376 } 1377 1378 static int elan_suspend(struct device *dev) 1379 { 1380 struct i2c_client *client = to_i2c_client(dev); 1381 struct elan_tp_data *data = i2c_get_clientdata(client); 1382 int error; 1383 1384 /* 1385 * We are taking the mutex to make sure sysfs operations are 1386 * complete before we attempt to bring the device into low[er] 1387 * power mode. 1388 */ 1389 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) { 1390 disable_irq(client->irq); 1391 1392 error = __elan_suspend(data); 1393 if (error) { 1394 enable_irq(client->irq); 1395 return error; 1396 } 1397 } 1398 1399 return 0; 1400 } 1401 1402 static int elan_resume(struct device *dev) 1403 { 1404 struct i2c_client *client = to_i2c_client(dev); 1405 struct elan_tp_data *data = i2c_get_clientdata(client); 1406 int error; 1407 1408 if (!device_may_wakeup(dev)) { 1409 error = regulator_enable(data->vcc); 1410 if (error) { 1411 dev_err(dev, "error %d enabling regulator\n", error); 1412 goto err; 1413 } 1414 } 1415 1416 error = elan_set_power(data, true); 1417 if (error) { 1418 dev_err(dev, "power up when resuming failed: %d\n", error); 1419 goto err; 1420 } 1421 1422 error = elan_initialize(data, data->quirks & ETP_QUIRK_QUICK_WAKEUP); 1423 if (error) 1424 dev_err(dev, "initialize when resuming failed: %d\n", error); 1425 1426 err: 1427 enable_irq(data->client->irq); 1428 return error; 1429 } 1430 1431 static DEFINE_SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume); 1432 1433 static const struct i2c_device_id elan_id[] = { 1434 { .name = DRIVER_NAME }, 1435 { } 1436 }; 1437 MODULE_DEVICE_TABLE(i2c, elan_id); 1438 1439 #ifdef CONFIG_ACPI 1440 #include <linux/input/elan-i2c-ids.h> 1441 MODULE_DEVICE_TABLE(acpi, elan_acpi_id); 1442 #endif 1443 1444 #ifdef CONFIG_OF 1445 static const struct of_device_id elan_of_match[] = { 1446 { .compatible = "elan,ekth3000" }, 1447 { /* sentinel */ } 1448 }; 1449 MODULE_DEVICE_TABLE(of, elan_of_match); 1450 #endif 1451 1452 static struct i2c_driver elan_driver = { 1453 .driver = { 1454 .name = DRIVER_NAME, 1455 .pm = pm_sleep_ptr(&elan_pm_ops), 1456 .acpi_match_table = ACPI_PTR(elan_acpi_id), 1457 .of_match_table = of_match_ptr(elan_of_match), 1458 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1459 .dev_groups = elan_sysfs_groups, 1460 }, 1461 .probe = elan_probe, 1462 .id_table = elan_id, 1463 }; 1464 1465 module_i2c_driver(elan_driver); 1466 1467 MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>"); 1468 MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver"); 1469 MODULE_LICENSE("GPL"); 1470