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/completion.h> 20 #include <linux/delay.h> 21 #include <linux/device.h> 22 #include <linux/firmware.h> 23 #include <linux/i2c.h> 24 #include <linux/init.h> 25 #include <linux/input.h> 26 #include <linux/input/mt.h> 27 #include <linux/interrupt.h> 28 #include <linux/irq.h> 29 #include <linux/jiffies.h> 30 #include <linux/kernel.h> 31 #include <linux/module.h> 32 #include <linux/of.h> 33 #include <linux/pm_wakeirq.h> 34 #include <linux/property.h> 35 #include <linux/regulator/consumer.h> 36 #include <linux/sched.h> 37 #include <linux/slab.h> 38 #include <linux/string_choices.h> 39 #include <linux/uaccess.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 u16 fw_page_delay; 90 u32 fw_signature_address; 91 92 u8 min_baseline; 93 u8 max_baseline; 94 bool baseline_ready; 95 u8 clickpad; 96 bool middle_button; 97 98 u32 quirks; /* Various quirks */ 99 }; 100 101 static u32 elan_i2c_lookup_quirks(u16 ic_type, u16 product_id) 102 { 103 static const struct { 104 u16 ic_type; 105 u16 product_id; 106 u32 quirks; 107 } elan_i2c_quirks[] = { 108 { 0x0D, ETP_PRODUCT_ID_DELBIN, ETP_QUIRK_QUICK_WAKEUP }, 109 { 0x0D, ETP_PRODUCT_ID_WHITEBOX, ETP_QUIRK_QUICK_WAKEUP }, 110 { 0x10, ETP_PRODUCT_ID_VOXEL, ETP_QUIRK_QUICK_WAKEUP }, 111 { 0x14, ETP_PRODUCT_ID_MAGPIE, ETP_QUIRK_QUICK_WAKEUP }, 112 { 0x14, ETP_PRODUCT_ID_BOBBA, ETP_QUIRK_QUICK_WAKEUP }, 113 }; 114 u32 quirks = 0; 115 int i; 116 117 for (i = 0; i < ARRAY_SIZE(elan_i2c_quirks); i++) { 118 if (elan_i2c_quirks[i].ic_type == ic_type && 119 elan_i2c_quirks[i].product_id == product_id) { 120 quirks = elan_i2c_quirks[i].quirks; 121 } 122 } 123 124 if (ic_type >= 0x0D && product_id >= 0x123) 125 quirks |= ETP_QUIRK_QUICK_WAKEUP; 126 127 return quirks; 128 } 129 130 static int elan_get_fwinfo(u16 ic_type, u8 iap_version, u16 *validpage_count, 131 u32 *signature_address, u16 *page_size, 132 u16 *page_delay) 133 { 134 *page_delay = 30; 135 136 switch (ic_type) { 137 case 0x00: 138 case 0x06: 139 case 0x08: 140 *validpage_count = 512; 141 break; 142 case 0x03: 143 case 0x07: 144 case 0x09: 145 case 0x0A: 146 case 0x0B: 147 case 0x0C: 148 *validpage_count = 768; 149 break; 150 case 0x0D: 151 *validpage_count = 896; 152 break; 153 case 0x0E: 154 *validpage_count = 640; 155 break; 156 case 0x10: 157 *validpage_count = 1024; 158 break; 159 case 0x11: 160 *validpage_count = 1280; 161 break; 162 case 0x13: 163 *validpage_count = 2048; 164 break; 165 case 0x14: 166 case 0x15: 167 *validpage_count = 1024; 168 break; 169 case 0x19: 170 *validpage_count = 2032; 171 *page_delay = 10; 172 break; 173 default: 174 /* unknown ic type clear value */ 175 *validpage_count = 0; 176 *signature_address = 0; 177 *page_size = 0; 178 return -ENXIO; 179 } 180 181 *signature_address = 182 (*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE; 183 184 if ((ic_type == 0x14 || ic_type == 0x15) && iap_version >= 2) { 185 *validpage_count /= 8; 186 *page_size = ETP_FW_PAGE_SIZE_512; 187 *page_delay = 50; 188 } else if (ic_type >= 0x0D && iap_version >= 1) { 189 *validpage_count /= 2; 190 *page_size = ETP_FW_PAGE_SIZE_128; 191 } else { 192 *page_size = ETP_FW_PAGE_SIZE; 193 } 194 195 return 0; 196 } 197 198 static int elan_set_power(struct elan_tp_data *data, bool on) 199 { 200 int repeat = ETP_RETRY_COUNT; 201 int error; 202 203 do { 204 error = data->ops->power_control(data->client, on); 205 if (error >= 0) 206 return 0; 207 208 msleep(30); 209 } while (--repeat > 0); 210 211 dev_err(&data->client->dev, "failed to set power %s: %d\n", 212 str_on_off(on), error); 213 return error; 214 } 215 216 static int elan_sleep(struct elan_tp_data *data) 217 { 218 int repeat = ETP_RETRY_COUNT; 219 int error; 220 221 do { 222 error = data->ops->sleep_control(data->client, true); 223 if (!error) 224 return 0; 225 226 msleep(30); 227 } while (--repeat > 0); 228 229 return error; 230 } 231 232 static int elan_query_product(struct elan_tp_data *data) 233 { 234 int error; 235 236 error = data->ops->get_product_id(data->client, &data->product_id); 237 if (error) 238 return error; 239 240 error = data->ops->get_pattern(data->client, &data->pattern); 241 if (error) 242 return error; 243 244 error = data->ops->get_sm_version(data->client, data->pattern, 245 &data->ic_type, &data->sm_version, 246 &data->clickpad); 247 if (error) 248 return error; 249 250 return 0; 251 } 252 253 static int elan_check_ASUS_special_fw(struct elan_tp_data *data) 254 { 255 if (data->ic_type == 0x0E) { 256 switch (data->product_id) { 257 case 0x05 ... 0x07: 258 case 0x09: 259 case 0x13: 260 return true; 261 } 262 } else if (data->ic_type == 0x08 && data->product_id == 0x26) { 263 /* ASUS EeeBook X205TA */ 264 return true; 265 } 266 267 return false; 268 } 269 270 static int __elan_initialize(struct elan_tp_data *data, bool skip_reset) 271 { 272 struct i2c_client *client = data->client; 273 bool woken_up = false; 274 int error; 275 276 if (!skip_reset) { 277 error = data->ops->initialize(client); 278 if (error) { 279 dev_err(&client->dev, "device initialize failed: %d\n", error); 280 return error; 281 } 282 } 283 284 error = elan_query_product(data); 285 if (error) 286 return error; 287 288 /* 289 * Some ASUS devices were shipped with firmware that requires 290 * touchpads to be woken up first, before attempting to switch 291 * them into absolute reporting mode. 292 */ 293 if (elan_check_ASUS_special_fw(data)) { 294 error = data->ops->sleep_control(client, false); 295 if (error) { 296 dev_err(&client->dev, 297 "failed to wake device up: %d\n", error); 298 return error; 299 } 300 301 msleep(200); 302 woken_up = true; 303 } 304 305 data->mode |= ETP_ENABLE_ABS; 306 error = data->ops->set_mode(client, data->mode); 307 if (error) { 308 dev_err(&client->dev, 309 "failed to switch to absolute mode: %d\n", error); 310 return error; 311 } 312 313 if (!woken_up) { 314 error = data->ops->sleep_control(client, false); 315 if (error) { 316 dev_err(&client->dev, 317 "failed to wake device up: %d\n", error); 318 return error; 319 } 320 } 321 322 return 0; 323 } 324 325 static int elan_initialize(struct elan_tp_data *data, bool skip_reset) 326 { 327 int repeat = ETP_RETRY_COUNT; 328 int error; 329 330 do { 331 error = __elan_initialize(data, skip_reset); 332 if (!error) 333 return 0; 334 335 skip_reset = false; 336 msleep(30); 337 } while (--repeat > 0); 338 339 return error; 340 } 341 342 static int elan_query_device_info(struct elan_tp_data *data) 343 { 344 int error; 345 346 error = data->ops->get_version(data->client, data->pattern, false, 347 &data->fw_version); 348 if (error) 349 return error; 350 351 error = data->ops->get_checksum(data->client, false, 352 &data->fw_checksum); 353 if (error) 354 return error; 355 356 error = data->ops->get_version(data->client, data->pattern, 357 true, &data->iap_version); 358 if (error) 359 return error; 360 361 error = data->ops->get_pressure_adjustment(data->client, 362 &data->pressure_adjustment); 363 if (error) 364 return error; 365 366 error = data->ops->get_report_features(data->client, data->pattern, 367 &data->report_features, 368 &data->report_len); 369 if (error) 370 return error; 371 372 data->quirks = elan_i2c_lookup_quirks(data->ic_type, data->product_id); 373 374 error = elan_get_fwinfo(data->ic_type, data->iap_version, 375 &data->fw_validpage_count, 376 &data->fw_signature_address, 377 &data->fw_page_size, 378 &data->fw_page_delay); 379 if (error) 380 dev_warn(&data->client->dev, 381 "unexpected iap version %#04x (ic type: %#04x), firmware update will not work\n", 382 data->iap_version, data->ic_type); 383 384 return 0; 385 } 386 387 static unsigned int elan_convert_resolution(u8 val, u8 pattern) 388 { 389 /* 390 * pattern <= 0x01: 391 * (value from firmware) * 10 + 790 = dpi 392 * else 393 * ((value from firmware) + 3) * 100 = dpi 394 */ 395 int res = pattern <= 0x01 ? 396 (int)(char)val * 10 + 790 : ((int)(char)val + 3) * 100; 397 /* 398 * We also have to convert dpi to dots/mm (*10/254 to avoid floating 399 * point). 400 */ 401 return res * 10 / 254; 402 } 403 404 static int elan_query_device_parameters(struct elan_tp_data *data) 405 { 406 struct i2c_client *client = data->client; 407 unsigned int x_traces, y_traces; 408 u32 x_mm, y_mm; 409 u8 hw_x_res, hw_y_res; 410 int error; 411 412 if (device_property_read_u32(&client->dev, 413 "touchscreen-size-x", &data->max_x) || 414 device_property_read_u32(&client->dev, 415 "touchscreen-size-y", &data->max_y)) { 416 error = data->ops->get_max(data->client, 417 &data->max_x, 418 &data->max_y); 419 if (error) 420 return error; 421 } else { 422 /* size is the maximum + 1 */ 423 --data->max_x; 424 --data->max_y; 425 } 426 427 if (device_property_read_u32(&client->dev, 428 "elan,x_traces", 429 &x_traces) || 430 device_property_read_u32(&client->dev, 431 "elan,y_traces", 432 &y_traces)) { 433 error = data->ops->get_num_traces(data->client, 434 &x_traces, &y_traces); 435 if (error) 436 return error; 437 } 438 439 if (!x_traces || !y_traces) { 440 dev_warn(&client->dev, 441 "invalid trace numbers: x=%u, y=%u\n", 442 x_traces, y_traces); 443 data->width_x = 1; 444 data->width_y = 1; 445 } else { 446 data->width_x = data->max_x / x_traces; 447 data->width_y = data->max_y / y_traces; 448 } 449 450 if (device_property_read_u32(&client->dev, 451 "touchscreen-x-mm", &x_mm) || 452 device_property_read_u32(&client->dev, 453 "touchscreen-y-mm", &y_mm)) { 454 error = data->ops->get_resolution(data->client, 455 &hw_x_res, &hw_y_res); 456 if (error) 457 return error; 458 459 data->x_res = elan_convert_resolution(hw_x_res, data->pattern); 460 data->y_res = elan_convert_resolution(hw_y_res, data->pattern); 461 } else { 462 if (unlikely(x_mm == 0 || y_mm == 0)) { 463 dev_warn(&client->dev, 464 "invalid physical dimensions: x_mm=%u, y_mm=%u\n", 465 x_mm, y_mm); 466 data->x_res = 1; 467 data->y_res = 1; 468 } else { 469 data->x_res = (data->max_x + 1) / x_mm; 470 data->y_res = (data->max_y + 1) / y_mm; 471 } 472 } 473 474 if (device_property_read_bool(&client->dev, "elan,clickpad")) 475 data->clickpad = 1; 476 477 if (device_property_read_bool(&client->dev, "elan,middle-button")) 478 data->middle_button = true; 479 480 return 0; 481 } 482 483 /* 484 ********************************************************** 485 * IAP firmware updater related routines 486 ********************************************************** 487 */ 488 static int elan_write_fw_block(struct elan_tp_data *data, u16 page_size, 489 u16 page_delay, const u8 *page, u16 checksum, 490 int idx) 491 { 492 int retry = ETP_RETRY_COUNT; 493 int error; 494 495 do { 496 error = data->ops->write_fw_block(data->client, page_size, 497 page_delay, page, checksum, 498 idx); 499 if (!error) 500 return 0; 501 502 dev_dbg(&data->client->dev, 503 "IAP retrying page %d (error: %d)\n", idx, error); 504 } while (--retry > 0); 505 506 return error; 507 } 508 509 static int __elan_update_firmware(struct elan_tp_data *data, 510 const struct firmware *fw) 511 { 512 struct i2c_client *client = data->client; 513 struct device *dev = &client->dev; 514 int i, j; 515 int error; 516 u16 iap_start_addr; 517 u16 boot_page_count; 518 u16 sw_checksum = 0, fw_checksum = 0; 519 520 error = data->ops->prepare_fw_update(client, data->ic_type, 521 data->iap_version, 522 data->fw_page_size); 523 if (error) 524 return error; 525 526 iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]); 527 528 boot_page_count = (iap_start_addr * 2) / data->fw_page_size; 529 for (i = boot_page_count; i < data->fw_validpage_count; i++) { 530 u16 checksum = 0; 531 const u8 *page = &fw->data[i * data->fw_page_size]; 532 533 for (j = 0; j < data->fw_page_size; j += 2) 534 checksum += ((page[j + 1] << 8) | page[j]); 535 536 error = elan_write_fw_block(data, data->fw_page_size, 537 data->fw_page_delay, page, checksum, 538 i); 539 if (error) { 540 dev_err(dev, "write page %d fail: %d\n", i, error); 541 return error; 542 } 543 544 sw_checksum += checksum; 545 } 546 547 /* Wait WDT reset and power on reset */ 548 msleep(600); 549 550 error = data->ops->finish_fw_update(client, &data->fw_completion); 551 if (error) 552 return error; 553 554 error = data->ops->get_checksum(client, true, &fw_checksum); 555 if (error) 556 return error; 557 558 if (sw_checksum != fw_checksum) { 559 dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n", 560 sw_checksum, fw_checksum); 561 return -EIO; 562 } 563 564 return 0; 565 } 566 567 static int elan_update_firmware(struct elan_tp_data *data, 568 const struct firmware *fw) 569 { 570 struct i2c_client *client = data->client; 571 int retval; 572 573 dev_dbg(&client->dev, "Starting firmware update....\n"); 574 575 guard(disable_irq)(&client->irq); 576 577 data->in_fw_update = true; 578 579 retval = __elan_update_firmware(data, fw); 580 if (retval) { 581 dev_err(&client->dev, "firmware update failed: %d\n", retval); 582 data->ops->iap_reset(client); 583 } else { 584 /* Reinitialize TP after fw is updated */ 585 elan_initialize(data, false); 586 elan_query_device_info(data); 587 } 588 589 data->in_fw_update = false; 590 591 return retval; 592 } 593 594 /* 595 ******************************************************************* 596 * SYSFS attributes 597 ******************************************************************* 598 */ 599 static ssize_t elan_sysfs_read_fw_checksum(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, "0x%04x\n", data->fw_checksum); 607 } 608 609 static ssize_t elan_sysfs_read_product_id(struct device *dev, 610 struct device_attribute *attr, 611 char *buf) 612 { 613 struct i2c_client *client = to_i2c_client(dev); 614 struct elan_tp_data *data = i2c_get_clientdata(client); 615 616 return sysfs_emit(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n", 617 data->product_id); 618 } 619 620 static ssize_t elan_sysfs_read_fw_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->fw_version); 628 } 629 630 static ssize_t elan_sysfs_read_sm_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->sm_version); 638 } 639 640 static ssize_t elan_sysfs_read_iap_ver(struct device *dev, 641 struct device_attribute *attr, 642 char *buf) 643 { 644 struct i2c_client *client = to_i2c_client(dev); 645 struct elan_tp_data *data = i2c_get_clientdata(client); 646 647 return sysfs_emit(buf, "%d.0\n", data->iap_version); 648 } 649 650 static ssize_t elan_sysfs_update_fw(struct device *dev, 651 struct device_attribute *attr, 652 const char *buf, size_t count) 653 { 654 struct elan_tp_data *data = dev_get_drvdata(dev); 655 int error; 656 const u8 *fw_signature; 657 static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF}; 658 659 if (data->fw_validpage_count == 0) 660 return -EINVAL; 661 662 /* Look for a firmware with the product id appended. */ 663 const char *fw_name __free(kfree) = 664 kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id); 665 if (!fw_name) { 666 dev_err(dev, "failed to allocate memory for firmware name\n"); 667 return -ENOMEM; 668 } 669 670 dev_info(dev, "requesting fw '%s'\n", fw_name); 671 const struct firmware *fw __free(firmware) = NULL; 672 error = request_firmware(&fw, fw_name, dev); 673 if (error) { 674 dev_err(dev, "failed to request firmware: %d\n", error); 675 return error; 676 } 677 678 if (fw->size < data->fw_signature_address + sizeof(signature)) { 679 dev_err(dev, "firmware file too small\n"); 680 return -EBADF; 681 } 682 683 /* Firmware file must match signature data */ 684 fw_signature = &fw->data[data->fw_signature_address]; 685 if (memcmp(fw_signature, signature, sizeof(signature)) != 0) { 686 dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n", 687 (int)sizeof(signature), signature, 688 (int)sizeof(signature), fw_signature); 689 return -EBADF; 690 } 691 692 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) { 693 error = elan_update_firmware(data, fw); 694 if (error) 695 return error; 696 } 697 698 return count; 699 } 700 701 static int elan_calibrate(struct elan_tp_data *data) 702 { 703 struct i2c_client *client = data->client; 704 struct device *dev = &client->dev; 705 int tries = 20; 706 int retval; 707 int error; 708 u8 val[ETP_CALIBRATE_MAX_LEN]; 709 710 guard(disable_irq)(&client->irq); 711 712 data->mode |= ETP_ENABLE_CALIBRATE; 713 retval = data->ops->set_mode(client, data->mode); 714 if (retval) { 715 data->mode &= ~ETP_ENABLE_CALIBRATE; 716 dev_err(dev, "failed to enable calibration mode: %d\n", 717 retval); 718 return retval; 719 } 720 721 retval = data->ops->calibrate(client); 722 if (retval) { 723 dev_err(dev, "failed to start calibration: %d\n", 724 retval); 725 goto out_disable_calibrate; 726 } 727 728 val[0] = 0xff; 729 do { 730 /* Wait 250ms before checking if calibration has completed. */ 731 msleep(250); 732 733 retval = data->ops->calibrate_result(client, val); 734 if (retval) 735 dev_err(dev, "failed to check calibration result: %d\n", 736 retval); 737 else if (val[0] == 0) 738 break; /* calibration done */ 739 740 } while (--tries); 741 742 if (tries == 0) { 743 dev_err(dev, "failed to calibrate. Timeout.\n"); 744 retval = -ETIMEDOUT; 745 } 746 747 out_disable_calibrate: 748 data->mode &= ~ETP_ENABLE_CALIBRATE; 749 error = data->ops->set_mode(data->client, data->mode); 750 if (error) { 751 dev_err(dev, "failed to disable calibration mode: %d\n", 752 error); 753 if (!retval) 754 retval = error; 755 } 756 return retval; 757 } 758 759 static ssize_t calibrate_store(struct device *dev, 760 struct device_attribute *attr, 761 const char *buf, size_t count) 762 { 763 struct i2c_client *client = to_i2c_client(dev); 764 struct elan_tp_data *data = i2c_get_clientdata(client); 765 int error; 766 767 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) { 768 error = elan_calibrate(data); 769 if (error) 770 return error; 771 } 772 773 return count; 774 } 775 776 static ssize_t elan_sysfs_read_mode(struct device *dev, 777 struct device_attribute *attr, 778 char *buf) 779 { 780 struct i2c_client *client = to_i2c_client(dev); 781 struct elan_tp_data *data = i2c_get_clientdata(client); 782 int error; 783 enum tp_mode mode; 784 785 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) { 786 error = data->ops->iap_get_mode(data->client, &mode); 787 if (error) 788 return error; 789 } 790 791 return sysfs_emit(buf, "%d\n", (int)mode); 792 } 793 794 static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL); 795 static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL); 796 static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL); 797 static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL); 798 static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL); 799 static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL); 800 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw); 801 802 static DEVICE_ATTR_WO(calibrate); 803 804 static struct attribute *elan_sysfs_entries[] = { 805 &dev_attr_product_id.attr, 806 &dev_attr_firmware_version.attr, 807 &dev_attr_sample_version.attr, 808 &dev_attr_iap_version.attr, 809 &dev_attr_fw_checksum.attr, 810 &dev_attr_calibrate.attr, 811 &dev_attr_mode.attr, 812 &dev_attr_update_fw.attr, 813 NULL, 814 }; 815 816 static const struct attribute_group elan_sysfs_group = { 817 .attrs = elan_sysfs_entries, 818 }; 819 820 static int elan_acquire_baseline(struct elan_tp_data *data) 821 { 822 struct i2c_client *client = data->client; 823 struct device *dev = &client->dev; 824 int retval; 825 int error; 826 827 guard(disable_irq)(&client->irq); 828 829 data->baseline_ready = false; 830 831 data->mode |= ETP_ENABLE_CALIBRATE; 832 retval = data->ops->set_mode(client, data->mode); 833 if (retval) { 834 data->mode &= ~ETP_ENABLE_CALIBRATE; 835 dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n", 836 retval); 837 return retval; 838 } 839 840 msleep(250); 841 842 retval = data->ops->get_baseline_data(client, true, 843 &data->max_baseline); 844 if (retval) { 845 dev_err(dev, "Failed to read max baseline from device: %d\n", 846 retval); 847 goto out_disable_calibrate; 848 } 849 850 retval = data->ops->get_baseline_data(client, false, 851 &data->min_baseline); 852 if (retval) { 853 dev_err(dev, "Failed to read min baseline from device: %d\n", 854 retval); 855 goto out_disable_calibrate; 856 } 857 858 data->baseline_ready = true; 859 860 out_disable_calibrate: 861 data->mode &= ~ETP_ENABLE_CALIBRATE; 862 error = data->ops->set_mode(client, data->mode); 863 if (error) { 864 dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n", 865 error); 866 if (!retval) 867 retval = error; 868 } 869 870 return retval; 871 } 872 873 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr, 874 const char *buf, size_t count) 875 { 876 struct i2c_client *client = to_i2c_client(dev); 877 struct elan_tp_data *data = i2c_get_clientdata(client); 878 int error; 879 880 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) { 881 error = elan_acquire_baseline(data); 882 if (error) 883 return error; 884 } 885 886 return count; 887 } 888 889 static ssize_t min_show(struct device *dev, 890 struct device_attribute *attr, char *buf) 891 { 892 struct i2c_client *client = to_i2c_client(dev); 893 struct elan_tp_data *data = i2c_get_clientdata(client); 894 895 scoped_guard(mutex_intr, &data->sysfs_mutex) { 896 if (!data->baseline_ready) 897 return -ENODATA; 898 899 return sysfs_emit(buf, "%d", data->min_baseline); 900 } 901 902 return -EINTR; 903 } 904 905 static ssize_t max_show(struct device *dev, 906 struct device_attribute *attr, char *buf) 907 { 908 struct i2c_client *client = to_i2c_client(dev); 909 struct elan_tp_data *data = i2c_get_clientdata(client); 910 911 scoped_guard(mutex_intr, &data->sysfs_mutex) { 912 if (!data->baseline_ready) 913 return -ENODATA; 914 915 return sysfs_emit(buf, "%d", data->max_baseline); 916 } 917 918 return -EINTR; 919 } 920 921 static DEVICE_ATTR_WO(acquire); 922 static DEVICE_ATTR_RO(min); 923 static DEVICE_ATTR_RO(max); 924 925 static struct attribute *elan_baseline_sysfs_entries[] = { 926 &dev_attr_acquire.attr, 927 &dev_attr_min.attr, 928 &dev_attr_max.attr, 929 NULL, 930 }; 931 932 static const struct attribute_group elan_baseline_sysfs_group = { 933 .name = "baseline", 934 .attrs = elan_baseline_sysfs_entries, 935 }; 936 937 static const struct attribute_group *elan_sysfs_groups[] = { 938 &elan_sysfs_group, 939 &elan_baseline_sysfs_group, 940 NULL 941 }; 942 943 /* 944 ****************************************************************** 945 * Elan isr functions 946 ****************************************************************** 947 */ 948 static void elan_report_contact(struct elan_tp_data *data, int contact_num, 949 bool contact_valid, bool high_precision, 950 u8 *packet, u8 *finger_data) 951 { 952 struct input_dev *input = data->input; 953 unsigned int pos_x, pos_y; 954 unsigned int pressure, scaled_pressure; 955 956 if (contact_valid) { 957 if (high_precision) { 958 pos_x = get_unaligned_be16(&finger_data[0]); 959 pos_y = get_unaligned_be16(&finger_data[2]); 960 } else { 961 pos_x = ((finger_data[0] & 0xf0) << 4) | finger_data[1]; 962 pos_y = ((finger_data[0] & 0x0f) << 8) | finger_data[2]; 963 } 964 965 if (pos_x > data->max_x || pos_y > data->max_y) { 966 dev_dbg(input->dev.parent, 967 "[%d] x=%d y=%d over max (%d, %d)", 968 contact_num, pos_x, pos_y, 969 data->max_x, data->max_y); 970 return; 971 } 972 973 pressure = finger_data[4]; 974 scaled_pressure = pressure + data->pressure_adjustment; 975 if (scaled_pressure > ETP_MAX_PRESSURE) 976 scaled_pressure = ETP_MAX_PRESSURE; 977 978 input_mt_slot(input, contact_num); 979 input_mt_report_slot_state(input, MT_TOOL_FINGER, true); 980 input_report_abs(input, ABS_MT_POSITION_X, pos_x); 981 input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y); 982 input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure); 983 984 if (data->report_features & ETP_FEATURE_REPORT_MK) { 985 unsigned int mk_x, mk_y, area_x, area_y; 986 int adj_width_x, adj_width_y; 987 u8 mk_data = high_precision ? 988 packet[ETP_MK_DATA_OFFSET + contact_num] : 989 finger_data[3]; 990 991 mk_x = mk_data & 0x0f; 992 mk_y = mk_data >> 4; 993 994 /* 995 * To avoid treating large finger as palm, let's reduce 996 * the width x and y per trace. 997 */ 998 999 adj_width_x = data->width_x > ETP_FWIDTH_REDUCE ? 1000 data->width_x - ETP_FWIDTH_REDUCE : 0; 1001 adj_width_y = data->width_y > ETP_FWIDTH_REDUCE ? 1002 data->width_y - ETP_FWIDTH_REDUCE : 0; 1003 1004 area_x = mk_x * adj_width_x; 1005 area_y = mk_y * adj_width_y; 1006 1007 input_report_abs(input, ABS_TOOL_WIDTH, mk_x); 1008 input_report_abs(input, ABS_MT_TOUCH_MAJOR, 1009 max(area_x, area_y)); 1010 input_report_abs(input, ABS_MT_TOUCH_MINOR, 1011 min(area_x, area_y)); 1012 } 1013 } else { 1014 input_mt_slot(input, contact_num); 1015 input_mt_report_slot_inactive(input); 1016 } 1017 } 1018 1019 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet, 1020 bool high_precision) 1021 { 1022 struct input_dev *input = data->input; 1023 u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET]; 1024 int i; 1025 u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET]; 1026 u8 hover_info = packet[ETP_HOVER_INFO_OFFSET]; 1027 bool contact_valid, hover_event; 1028 1029 pm_wakeup_event(&data->client->dev, 0); 1030 1031 hover_event = hover_info & BIT(6); 1032 1033 for (i = 0; i < ETP_MAX_FINGERS; i++) { 1034 contact_valid = tp_info & BIT(3 + i); 1035 elan_report_contact(data, i, contact_valid, high_precision, 1036 packet, finger_data); 1037 if (contact_valid) 1038 finger_data += ETP_FINGER_DATA_LEN; 1039 } 1040 1041 input_report_key(input, BTN_LEFT, tp_info & BIT(0)); 1042 input_report_key(input, BTN_MIDDLE, tp_info & BIT(2)); 1043 input_report_key(input, BTN_RIGHT, tp_info & BIT(1)); 1044 input_report_abs(input, ABS_DISTANCE, hover_event != 0); 1045 input_mt_report_pointer_emulation(input, true); 1046 input_sync(input); 1047 } 1048 1049 static void elan_report_trackpoint(struct elan_tp_data *data, u8 *report) 1050 { 1051 struct input_dev *input = data->tp_input; 1052 u8 *packet = &report[ETP_REPORT_ID_OFFSET + 1]; 1053 int x, y; 1054 1055 pm_wakeup_event(&data->client->dev, 0); 1056 1057 if (!data->tp_input) { 1058 dev_warn_once(&data->client->dev, 1059 "received a trackpoint report while no trackpoint device has been created. Please report upstream.\n"); 1060 return; 1061 } 1062 1063 input_report_key(input, BTN_LEFT, packet[0] & 0x01); 1064 input_report_key(input, BTN_RIGHT, packet[0] & 0x02); 1065 input_report_key(input, BTN_MIDDLE, packet[0] & 0x04); 1066 1067 if ((packet[3] & 0x0F) == 0x06) { 1068 x = packet[4] - (int)((packet[1] ^ 0x80) << 1); 1069 y = (int)((packet[2] ^ 0x80) << 1) - packet[5]; 1070 1071 input_report_rel(input, REL_X, x); 1072 input_report_rel(input, REL_Y, y); 1073 } 1074 1075 input_sync(input); 1076 } 1077 1078 static irqreturn_t elan_isr(int irq, void *dev_id) 1079 { 1080 struct elan_tp_data *data = dev_id; 1081 int error; 1082 u8 report[ETP_MAX_REPORT_LEN]; 1083 1084 /* 1085 * When device is connected to i2c bus, when all IAP page writes 1086 * complete, the driver will receive interrupt and must read 1087 * 0000 to confirm that IAP is finished. 1088 */ 1089 if (data->in_fw_update) { 1090 complete(&data->fw_completion); 1091 goto out; 1092 } 1093 1094 error = data->ops->get_report(data->client, report, data->report_len); 1095 if (error) 1096 goto out; 1097 1098 switch (report[ETP_REPORT_ID_OFFSET]) { 1099 case ETP_REPORT_ID: 1100 elan_report_absolute(data, report, false); 1101 break; 1102 case ETP_REPORT_ID2: 1103 elan_report_absolute(data, report, true); 1104 break; 1105 case ETP_TP_REPORT_ID: 1106 case ETP_TP_REPORT_ID2: 1107 elan_report_trackpoint(data, report); 1108 break; 1109 default: 1110 dev_err(&data->client->dev, "invalid report id data (%x)\n", 1111 report[ETP_REPORT_ID_OFFSET]); 1112 } 1113 1114 out: 1115 return IRQ_HANDLED; 1116 } 1117 1118 /* 1119 ****************************************************************** 1120 * Elan initialization functions 1121 ****************************************************************** 1122 */ 1123 1124 static int elan_setup_trackpoint_input_device(struct elan_tp_data *data) 1125 { 1126 struct device *dev = &data->client->dev; 1127 struct input_dev *input; 1128 1129 input = devm_input_allocate_device(dev); 1130 if (!input) 1131 return -ENOMEM; 1132 1133 input->name = "Elan TrackPoint"; 1134 input->id.bustype = BUS_I2C; 1135 input->id.vendor = ELAN_VENDOR_ID; 1136 input->id.product = data->product_id; 1137 input_set_drvdata(input, data); 1138 1139 input_set_capability(input, EV_REL, REL_X); 1140 input_set_capability(input, EV_REL, REL_Y); 1141 input_set_capability(input, EV_KEY, BTN_LEFT); 1142 input_set_capability(input, EV_KEY, BTN_RIGHT); 1143 input_set_capability(input, EV_KEY, BTN_MIDDLE); 1144 1145 __set_bit(INPUT_PROP_POINTER, input->propbit); 1146 __set_bit(INPUT_PROP_POINTING_STICK, input->propbit); 1147 1148 data->tp_input = input; 1149 1150 return 0; 1151 } 1152 1153 static int elan_setup_input_device(struct elan_tp_data *data) 1154 { 1155 struct device *dev = &data->client->dev; 1156 struct input_dev *input; 1157 unsigned int max_width = max(data->width_x, data->width_y); 1158 unsigned int min_width = min(data->width_x, data->width_y); 1159 int error; 1160 1161 input = devm_input_allocate_device(dev); 1162 if (!input) 1163 return -ENOMEM; 1164 1165 input->name = "Elan Touchpad"; 1166 input->id.bustype = BUS_I2C; 1167 input->id.vendor = ELAN_VENDOR_ID; 1168 input->id.product = data->product_id; 1169 input_set_drvdata(input, data); 1170 1171 error = input_mt_init_slots(input, ETP_MAX_FINGERS, 1172 INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED); 1173 if (error) { 1174 dev_err(dev, "failed to initialize MT slots: %d\n", error); 1175 return error; 1176 } 1177 1178 __set_bit(EV_ABS, input->evbit); 1179 __set_bit(INPUT_PROP_POINTER, input->propbit); 1180 if (data->clickpad) { 1181 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit); 1182 } else { 1183 __set_bit(BTN_RIGHT, input->keybit); 1184 if (data->middle_button) 1185 __set_bit(BTN_MIDDLE, input->keybit); 1186 } 1187 __set_bit(BTN_LEFT, input->keybit); 1188 1189 /* Set up ST parameters */ 1190 input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0); 1191 input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0); 1192 input_abs_set_res(input, ABS_X, data->x_res); 1193 input_abs_set_res(input, ABS_Y, data->y_res); 1194 input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0); 1195 if (data->report_features & ETP_FEATURE_REPORT_MK) 1196 input_set_abs_params(input, ABS_TOOL_WIDTH, 1197 0, ETP_FINGER_WIDTH, 0, 0); 1198 input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0); 1199 1200 /* And MT parameters */ 1201 input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0); 1202 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0); 1203 input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res); 1204 input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res); 1205 input_set_abs_params(input, ABS_MT_PRESSURE, 0, 1206 ETP_MAX_PRESSURE, 0, 0); 1207 if (data->report_features & ETP_FEATURE_REPORT_MK) { 1208 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 1209 0, ETP_FINGER_WIDTH * max_width, 0, 0); 1210 input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 1211 0, ETP_FINGER_WIDTH * min_width, 0, 0); 1212 } 1213 1214 data->input = input; 1215 1216 return 0; 1217 } 1218 1219 static void elan_disable_regulator(void *_data) 1220 { 1221 struct elan_tp_data *data = _data; 1222 1223 regulator_disable(data->vcc); 1224 } 1225 1226 static int elan_probe(struct i2c_client *client) 1227 { 1228 const struct elan_transport_ops *transport_ops; 1229 struct device *dev = &client->dev; 1230 struct elan_tp_data *data; 1231 unsigned long irqflags; 1232 int error; 1233 1234 if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) && 1235 i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { 1236 transport_ops = &elan_i2c_ops; 1237 } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) && 1238 i2c_check_functionality(client->adapter, 1239 I2C_FUNC_SMBUS_BYTE_DATA | 1240 I2C_FUNC_SMBUS_BLOCK_DATA | 1241 I2C_FUNC_SMBUS_I2C_BLOCK)) { 1242 transport_ops = &elan_smbus_ops; 1243 } else { 1244 dev_err(dev, "not a supported I2C/SMBus adapter\n"); 1245 return -EIO; 1246 } 1247 1248 data = devm_kzalloc(dev, sizeof(struct elan_tp_data), GFP_KERNEL); 1249 if (!data) 1250 return -ENOMEM; 1251 1252 i2c_set_clientdata(client, data); 1253 1254 data->ops = transport_ops; 1255 data->client = client; 1256 init_completion(&data->fw_completion); 1257 mutex_init(&data->sysfs_mutex); 1258 1259 data->vcc = devm_regulator_get(dev, "vcc"); 1260 if (IS_ERR(data->vcc)) 1261 return dev_err_probe(dev, PTR_ERR(data->vcc), "Failed to get 'vcc' regulator\n"); 1262 1263 error = regulator_enable(data->vcc); 1264 if (error) { 1265 dev_err(dev, "Failed to enable regulator: %d\n", error); 1266 return error; 1267 } 1268 1269 error = devm_add_action_or_reset(dev, elan_disable_regulator, data); 1270 if (error) { 1271 dev_err(dev, "Failed to add disable regulator action: %d\n", 1272 error); 1273 return error; 1274 } 1275 1276 /* Make sure there is something at this address */ 1277 error = i2c_smbus_read_byte(client); 1278 if (error < 0) { 1279 dev_dbg(&client->dev, "nothing at this address: %d\n", error); 1280 return -ENXIO; 1281 } 1282 1283 /* Initialize the touchpad. */ 1284 error = elan_initialize(data, false); 1285 if (error) 1286 return error; 1287 1288 error = elan_query_device_info(data); 1289 if (error) 1290 return error; 1291 1292 error = elan_query_device_parameters(data); 1293 if (error) 1294 return error; 1295 1296 dev_info(dev, 1297 "Elan Touchpad: Module ID: 0x%04x, Firmware: 0x%04x, Sample: 0x%04x, IAP: 0x%04x\n", 1298 data->product_id, 1299 data->fw_version, 1300 data->sm_version, 1301 data->iap_version); 1302 1303 dev_dbg(dev, 1304 "Elan Touchpad Extra Information:\n" 1305 " Max ABS X,Y: %d,%d\n" 1306 " Width X,Y: %d,%d\n" 1307 " Resolution X,Y: %d,%d (dots/mm)\n" 1308 " ic type: 0x%x\n" 1309 " info pattern: 0x%x\n", 1310 data->max_x, data->max_y, 1311 data->width_x, data->width_y, 1312 data->x_res, data->y_res, 1313 data->ic_type, data->pattern); 1314 1315 /* Set up input device properties based on queried parameters. */ 1316 error = elan_setup_input_device(data); 1317 if (error) 1318 return error; 1319 1320 if (device_property_read_bool(&client->dev, "elan,trackpoint")) { 1321 error = elan_setup_trackpoint_input_device(data); 1322 if (error) 1323 return error; 1324 } 1325 1326 /* 1327 * Platform code (ACPI, DTS) should normally set up interrupt 1328 * for us, but in case it did not let's fall back to using falling 1329 * edge to be compatible with older Chromebooks. 1330 */ 1331 irqflags = irq_get_trigger_type(client->irq); 1332 if (!irqflags) 1333 irqflags = IRQF_TRIGGER_FALLING; 1334 1335 error = devm_request_threaded_irq(dev, client->irq, NULL, elan_isr, 1336 irqflags | IRQF_ONESHOT, 1337 client->name, data); 1338 if (error) { 1339 dev_err(dev, "cannot register irq=%d\n", client->irq); 1340 return error; 1341 } 1342 1343 error = input_register_device(data->input); 1344 if (error) { 1345 dev_err(dev, "failed to register input device: %d\n", error); 1346 return error; 1347 } 1348 1349 if (data->tp_input) { 1350 error = input_register_device(data->tp_input); 1351 if (error) { 1352 dev_err(&client->dev, 1353 "failed to register TrackPoint input device: %d\n", 1354 error); 1355 return error; 1356 } 1357 } 1358 1359 return 0; 1360 } 1361 1362 static int __elan_suspend(struct elan_tp_data *data) 1363 { 1364 struct i2c_client *client = data->client; 1365 int error; 1366 1367 if (device_may_wakeup(&client->dev)) 1368 return elan_sleep(data); 1369 1370 /* Touchpad is not a wakeup source */ 1371 error = elan_set_power(data, false); 1372 if (error) 1373 return error; 1374 1375 error = regulator_disable(data->vcc); 1376 if (error) { 1377 dev_err(&client->dev, 1378 "failed to disable regulator when suspending: %d\n", 1379 error); 1380 /* Attempt to power the chip back up */ 1381 elan_set_power(data, true); 1382 return error; 1383 } 1384 1385 return 0; 1386 } 1387 1388 static int elan_suspend(struct device *dev) 1389 { 1390 struct i2c_client *client = to_i2c_client(dev); 1391 struct elan_tp_data *data = i2c_get_clientdata(client); 1392 int error; 1393 1394 /* 1395 * We are taking the mutex to make sure sysfs operations are 1396 * complete before we attempt to bring the device into low[er] 1397 * power mode. 1398 */ 1399 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) { 1400 disable_irq(client->irq); 1401 1402 error = __elan_suspend(data); 1403 if (error) { 1404 enable_irq(client->irq); 1405 return error; 1406 } 1407 } 1408 1409 return 0; 1410 } 1411 1412 static int elan_resume(struct device *dev) 1413 { 1414 struct i2c_client *client = to_i2c_client(dev); 1415 struct elan_tp_data *data = i2c_get_clientdata(client); 1416 int error; 1417 1418 if (!device_may_wakeup(dev)) { 1419 error = regulator_enable(data->vcc); 1420 if (error) { 1421 dev_err(dev, "error %d enabling regulator\n", error); 1422 goto err; 1423 } 1424 } 1425 1426 error = elan_set_power(data, true); 1427 if (error) { 1428 dev_err(dev, "power up when resuming failed: %d\n", error); 1429 goto err; 1430 } 1431 1432 error = elan_initialize(data, data->quirks & ETP_QUIRK_QUICK_WAKEUP); 1433 if (error) 1434 dev_err(dev, "initialize when resuming failed: %d\n", error); 1435 1436 err: 1437 enable_irq(data->client->irq); 1438 return error; 1439 } 1440 1441 static DEFINE_SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume); 1442 1443 static const struct i2c_device_id elan_id[] = { 1444 { .name = DRIVER_NAME }, 1445 { } 1446 }; 1447 MODULE_DEVICE_TABLE(i2c, elan_id); 1448 1449 #ifdef CONFIG_ACPI 1450 #include <linux/input/elan-i2c-ids.h> 1451 MODULE_DEVICE_TABLE(acpi, elan_acpi_id); 1452 #endif 1453 1454 #ifdef CONFIG_OF 1455 static const struct of_device_id elan_of_match[] = { 1456 { .compatible = "elan,ekth3000" }, 1457 { /* sentinel */ } 1458 }; 1459 MODULE_DEVICE_TABLE(of, elan_of_match); 1460 #endif 1461 1462 static struct i2c_driver elan_driver = { 1463 .driver = { 1464 .name = DRIVER_NAME, 1465 .pm = pm_sleep_ptr(&elan_pm_ops), 1466 .acpi_match_table = ACPI_PTR(elan_acpi_id), 1467 .of_match_table = of_match_ptr(elan_of_match), 1468 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1469 .dev_groups = elan_sysfs_groups, 1470 }, 1471 .probe = elan_probe, 1472 .id_table = elan_id, 1473 }; 1474 1475 module_i2c_driver(elan_driver); 1476 1477 MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>"); 1478 MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver"); 1479 MODULE_LICENSE("GPL"); 1480