1 /* 2 * Elan I2C/SMBus Touchpad driver 3 * 4 * Copyright (c) 2013 ELAN Microelectronics Corp. 5 * 6 * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw> 7 * Author: KT Liao <kt.liao@emc.com.tw> 8 * Version: 1.6.2 9 * 10 * Based on cyapa driver: 11 * copyright (c) 2011-2012 Cypress Semiconductor, Inc. 12 * copyright (c) 2011-2012 Google, Inc. 13 * 14 * This program is free software; you can redistribute it and/or modify it 15 * under the terms of the GNU General Public License version 2 as published 16 * by the Free Software Foundation. 17 * 18 * Trademarks are the property of their respective owners. 19 */ 20 21 #include <linux/acpi.h> 22 #include <linux/delay.h> 23 #include <linux/device.h> 24 #include <linux/firmware.h> 25 #include <linux/i2c.h> 26 #include <linux/init.h> 27 #include <linux/input/mt.h> 28 #include <linux/interrupt.h> 29 #include <linux/module.h> 30 #include <linux/slab.h> 31 #include <linux/kernel.h> 32 #include <linux/sched.h> 33 #include <linux/input.h> 34 #include <linux/uaccess.h> 35 #include <linux/jiffies.h> 36 #include <linux/completion.h> 37 #include <linux/of.h> 38 #include <linux/regulator/consumer.h> 39 #include <asm/unaligned.h> 40 41 #include "elan_i2c.h" 42 43 #define DRIVER_NAME "elan_i2c" 44 #define ELAN_DRIVER_VERSION "1.6.2" 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 #define ETP_MAX_FINGERS 5 52 #define ETP_FINGER_DATA_LEN 5 53 #define ETP_REPORT_ID 0x5D 54 #define ETP_REPORT_ID_OFFSET 2 55 #define ETP_TOUCH_INFO_OFFSET 3 56 #define ETP_FINGER_DATA_OFFSET 4 57 #define ETP_HOVER_INFO_OFFSET 30 58 #define ETP_MAX_REPORT_LEN 34 59 60 /* The main device structure */ 61 struct elan_tp_data { 62 struct i2c_client *client; 63 struct input_dev *input; 64 struct regulator *vcc; 65 66 const struct elan_transport_ops *ops; 67 68 /* for fw update */ 69 struct completion fw_completion; 70 bool in_fw_update; 71 72 struct mutex sysfs_mutex; 73 74 unsigned int max_x; 75 unsigned int max_y; 76 unsigned int width_x; 77 unsigned int width_y; 78 unsigned int x_res; 79 unsigned int y_res; 80 81 u16 product_id; 82 u8 fw_version; 83 u8 sm_version; 84 u8 iap_version; 85 u16 fw_checksum; 86 int pressure_adjustment; 87 u8 mode; 88 u8 ic_type; 89 u16 fw_validpage_count; 90 u16 fw_signature_address; 91 92 bool irq_wake; 93 94 u8 min_baseline; 95 u8 max_baseline; 96 bool baseline_ready; 97 }; 98 99 static int elan_get_fwinfo(u8 iap_version, u16 *validpage_count, 100 u16 *signature_address) 101 { 102 switch (iap_version) { 103 case 0x00: 104 case 0x06: 105 case 0x08: 106 *validpage_count = 512; 107 break; 108 case 0x03: 109 case 0x07: 110 case 0x09: 111 case 0x0A: 112 case 0x0B: 113 case 0x0C: 114 *validpage_count = 768; 115 break; 116 case 0x0D: 117 *validpage_count = 896; 118 break; 119 case 0x0E: 120 *validpage_count = 640; 121 break; 122 default: 123 /* unknown ic type clear value */ 124 *validpage_count = 0; 125 *signature_address = 0; 126 return -ENXIO; 127 } 128 129 *signature_address = 130 (*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE; 131 132 return 0; 133 } 134 135 static int elan_enable_power(struct elan_tp_data *data) 136 { 137 int repeat = ETP_RETRY_COUNT; 138 int error; 139 140 error = regulator_enable(data->vcc); 141 if (error) { 142 dev_err(&data->client->dev, 143 "failed to enable regulator: %d\n", error); 144 return error; 145 } 146 147 do { 148 error = data->ops->power_control(data->client, true); 149 if (error >= 0) 150 return 0; 151 152 msleep(30); 153 } while (--repeat > 0); 154 155 dev_err(&data->client->dev, "failed to enable power: %d\n", error); 156 return error; 157 } 158 159 static int elan_disable_power(struct elan_tp_data *data) 160 { 161 int repeat = ETP_RETRY_COUNT; 162 int error; 163 164 do { 165 error = data->ops->power_control(data->client, false); 166 if (!error) { 167 error = regulator_disable(data->vcc); 168 if (error) { 169 dev_err(&data->client->dev, 170 "failed to disable regulator: %d\n", 171 error); 172 /* Attempt to power the chip back up */ 173 data->ops->power_control(data->client, true); 174 break; 175 } 176 177 return 0; 178 } 179 180 msleep(30); 181 } while (--repeat > 0); 182 183 dev_err(&data->client->dev, "failed to disable power: %d\n", error); 184 return error; 185 } 186 187 static int elan_sleep(struct elan_tp_data *data) 188 { 189 int repeat = ETP_RETRY_COUNT; 190 int error; 191 192 do { 193 error = data->ops->sleep_control(data->client, true); 194 if (!error) 195 return 0; 196 197 msleep(30); 198 } while (--repeat > 0); 199 200 return error; 201 } 202 203 static int elan_query_product(struct elan_tp_data *data) 204 { 205 int error; 206 207 error = data->ops->get_product_id(data->client, &data->product_id); 208 if (error) 209 return error; 210 211 error = data->ops->get_sm_version(data->client, &data->ic_type, 212 &data->sm_version); 213 if (error) 214 return error; 215 216 return 0; 217 } 218 219 static int elan_check_ASUS_special_fw(struct elan_tp_data *data) 220 { 221 if (data->ic_type != 0x0E) 222 return false; 223 224 switch (data->product_id) { 225 case 0x05 ... 0x07: 226 case 0x09: 227 case 0x13: 228 return true; 229 default: 230 return false; 231 } 232 } 233 234 static int __elan_initialize(struct elan_tp_data *data) 235 { 236 struct i2c_client *client = data->client; 237 bool woken_up = false; 238 int error; 239 240 error = data->ops->initialize(client); 241 if (error) { 242 dev_err(&client->dev, "device initialize failed: %d\n", error); 243 return error; 244 } 245 246 error = elan_query_product(data); 247 if (error) 248 return error; 249 250 /* 251 * Some ASUS devices were shipped with firmware that requires 252 * touchpads to be woken up first, before attempting to switch 253 * them into absolute reporting mode. 254 */ 255 if (elan_check_ASUS_special_fw(data)) { 256 error = data->ops->sleep_control(client, false); 257 if (error) { 258 dev_err(&client->dev, 259 "failed to wake device up: %d\n", error); 260 return error; 261 } 262 263 msleep(200); 264 woken_up = true; 265 } 266 267 data->mode |= ETP_ENABLE_ABS; 268 error = data->ops->set_mode(client, data->mode); 269 if (error) { 270 dev_err(&client->dev, 271 "failed to switch to absolute mode: %d\n", error); 272 return error; 273 } 274 275 if (!woken_up) { 276 error = data->ops->sleep_control(client, false); 277 if (error) { 278 dev_err(&client->dev, 279 "failed to wake device up: %d\n", error); 280 return error; 281 } 282 } 283 284 return 0; 285 } 286 287 static int elan_initialize(struct elan_tp_data *data) 288 { 289 int repeat = ETP_RETRY_COUNT; 290 int error; 291 292 do { 293 error = __elan_initialize(data); 294 if (!error) 295 return 0; 296 297 msleep(30); 298 } while (--repeat > 0); 299 300 return error; 301 } 302 303 static int elan_query_device_info(struct elan_tp_data *data) 304 { 305 int error; 306 307 error = data->ops->get_version(data->client, false, &data->fw_version); 308 if (error) 309 return error; 310 311 error = data->ops->get_checksum(data->client, false, 312 &data->fw_checksum); 313 if (error) 314 return error; 315 316 error = data->ops->get_version(data->client, true, &data->iap_version); 317 if (error) 318 return error; 319 320 error = data->ops->get_pressure_adjustment(data->client, 321 &data->pressure_adjustment); 322 if (error) 323 return error; 324 325 error = elan_get_fwinfo(data->iap_version, &data->fw_validpage_count, 326 &data->fw_signature_address); 327 if (error) 328 dev_warn(&data->client->dev, 329 "unexpected iap version %#04x (ic type: %#04x), firmware update will not work\n", 330 data->iap_version, data->ic_type); 331 332 return 0; 333 } 334 335 static unsigned int elan_convert_resolution(u8 val) 336 { 337 /* 338 * (value from firmware) * 10 + 790 = dpi 339 * 340 * We also have to convert dpi to dots/mm (*10/254 to avoid floating 341 * point). 342 */ 343 344 return ((int)(char)val * 10 + 790) * 10 / 254; 345 } 346 347 static int elan_query_device_parameters(struct elan_tp_data *data) 348 { 349 unsigned int x_traces, y_traces; 350 u8 hw_x_res, hw_y_res; 351 int error; 352 353 error = data->ops->get_max(data->client, &data->max_x, &data->max_y); 354 if (error) 355 return error; 356 357 error = data->ops->get_num_traces(data->client, &x_traces, &y_traces); 358 if (error) 359 return error; 360 361 data->width_x = data->max_x / x_traces; 362 data->width_y = data->max_y / y_traces; 363 364 error = data->ops->get_resolution(data->client, &hw_x_res, &hw_y_res); 365 if (error) 366 return error; 367 368 data->x_res = elan_convert_resolution(hw_x_res); 369 data->y_res = elan_convert_resolution(hw_y_res); 370 371 return 0; 372 } 373 374 /* 375 ********************************************************** 376 * IAP firmware updater related routines 377 ********************************************************** 378 */ 379 static int elan_write_fw_block(struct elan_tp_data *data, 380 const u8 *page, u16 checksum, int idx) 381 { 382 int retry = ETP_RETRY_COUNT; 383 int error; 384 385 do { 386 error = data->ops->write_fw_block(data->client, 387 page, checksum, idx); 388 if (!error) 389 return 0; 390 391 dev_dbg(&data->client->dev, 392 "IAP retrying page %d (error: %d)\n", idx, error); 393 } while (--retry > 0); 394 395 return error; 396 } 397 398 static int __elan_update_firmware(struct elan_tp_data *data, 399 const struct firmware *fw) 400 { 401 struct i2c_client *client = data->client; 402 struct device *dev = &client->dev; 403 int i, j; 404 int error; 405 u16 iap_start_addr; 406 u16 boot_page_count; 407 u16 sw_checksum = 0, fw_checksum = 0; 408 409 error = data->ops->prepare_fw_update(client); 410 if (error) 411 return error; 412 413 iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]); 414 415 boot_page_count = (iap_start_addr * 2) / ETP_FW_PAGE_SIZE; 416 for (i = boot_page_count; i < data->fw_validpage_count; i++) { 417 u16 checksum = 0; 418 const u8 *page = &fw->data[i * ETP_FW_PAGE_SIZE]; 419 420 for (j = 0; j < ETP_FW_PAGE_SIZE; j += 2) 421 checksum += ((page[j + 1] << 8) | page[j]); 422 423 error = elan_write_fw_block(data, page, checksum, i); 424 if (error) { 425 dev_err(dev, "write page %d fail: %d\n", i, error); 426 return error; 427 } 428 429 sw_checksum += checksum; 430 } 431 432 /* Wait WDT reset and power on reset */ 433 msleep(600); 434 435 error = data->ops->finish_fw_update(client, &data->fw_completion); 436 if (error) 437 return error; 438 439 error = data->ops->get_checksum(client, true, &fw_checksum); 440 if (error) 441 return error; 442 443 if (sw_checksum != fw_checksum) { 444 dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n", 445 sw_checksum, fw_checksum); 446 return -EIO; 447 } 448 449 return 0; 450 } 451 452 static int elan_update_firmware(struct elan_tp_data *data, 453 const struct firmware *fw) 454 { 455 struct i2c_client *client = data->client; 456 int retval; 457 458 dev_dbg(&client->dev, "Starting firmware update....\n"); 459 460 disable_irq(client->irq); 461 data->in_fw_update = true; 462 463 retval = __elan_update_firmware(data, fw); 464 if (retval) { 465 dev_err(&client->dev, "firmware update failed: %d\n", retval); 466 data->ops->iap_reset(client); 467 } else { 468 /* Reinitialize TP after fw is updated */ 469 elan_initialize(data); 470 elan_query_device_info(data); 471 } 472 473 data->in_fw_update = false; 474 enable_irq(client->irq); 475 476 return retval; 477 } 478 479 /* 480 ******************************************************************* 481 * SYSFS attributes 482 ******************************************************************* 483 */ 484 static ssize_t elan_sysfs_read_fw_checksum(struct device *dev, 485 struct device_attribute *attr, 486 char *buf) 487 { 488 struct i2c_client *client = to_i2c_client(dev); 489 struct elan_tp_data *data = i2c_get_clientdata(client); 490 491 return sprintf(buf, "0x%04x\n", data->fw_checksum); 492 } 493 494 static ssize_t elan_sysfs_read_product_id(struct device *dev, 495 struct device_attribute *attr, 496 char *buf) 497 { 498 struct i2c_client *client = to_i2c_client(dev); 499 struct elan_tp_data *data = i2c_get_clientdata(client); 500 501 return sprintf(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n", 502 data->product_id); 503 } 504 505 static ssize_t elan_sysfs_read_fw_ver(struct device *dev, 506 struct device_attribute *attr, 507 char *buf) 508 { 509 struct i2c_client *client = to_i2c_client(dev); 510 struct elan_tp_data *data = i2c_get_clientdata(client); 511 512 return sprintf(buf, "%d.0\n", data->fw_version); 513 } 514 515 static ssize_t elan_sysfs_read_sm_ver(struct device *dev, 516 struct device_attribute *attr, 517 char *buf) 518 { 519 struct i2c_client *client = to_i2c_client(dev); 520 struct elan_tp_data *data = i2c_get_clientdata(client); 521 522 return sprintf(buf, "%d.0\n", data->sm_version); 523 } 524 525 static ssize_t elan_sysfs_read_iap_ver(struct device *dev, 526 struct device_attribute *attr, 527 char *buf) 528 { 529 struct i2c_client *client = to_i2c_client(dev); 530 struct elan_tp_data *data = i2c_get_clientdata(client); 531 532 return sprintf(buf, "%d.0\n", data->iap_version); 533 } 534 535 static ssize_t elan_sysfs_update_fw(struct device *dev, 536 struct device_attribute *attr, 537 const char *buf, size_t count) 538 { 539 struct elan_tp_data *data = dev_get_drvdata(dev); 540 const struct firmware *fw; 541 char *fw_name; 542 int error; 543 const u8 *fw_signature; 544 static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF}; 545 546 if (data->fw_validpage_count == 0) 547 return -EINVAL; 548 549 /* Look for a firmware with the product id appended. */ 550 fw_name = kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id); 551 if (!fw_name) { 552 dev_err(dev, "failed to allocate memory for firmware name\n"); 553 return -ENOMEM; 554 } 555 556 dev_info(dev, "requesting fw '%s'\n", fw_name); 557 error = request_firmware(&fw, fw_name, dev); 558 kfree(fw_name); 559 if (error) { 560 dev_err(dev, "failed to request firmware: %d\n", error); 561 return error; 562 } 563 564 /* Firmware file must match signature data */ 565 fw_signature = &fw->data[data->fw_signature_address]; 566 if (memcmp(fw_signature, signature, sizeof(signature)) != 0) { 567 dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n", 568 (int)sizeof(signature), signature, 569 (int)sizeof(signature), fw_signature); 570 error = -EBADF; 571 goto out_release_fw; 572 } 573 574 error = mutex_lock_interruptible(&data->sysfs_mutex); 575 if (error) 576 goto out_release_fw; 577 578 error = elan_update_firmware(data, fw); 579 580 mutex_unlock(&data->sysfs_mutex); 581 582 out_release_fw: 583 release_firmware(fw); 584 return error ?: count; 585 } 586 587 static ssize_t calibrate_store(struct device *dev, 588 struct device_attribute *attr, 589 const char *buf, size_t count) 590 { 591 struct i2c_client *client = to_i2c_client(dev); 592 struct elan_tp_data *data = i2c_get_clientdata(client); 593 int tries = 20; 594 int retval; 595 int error; 596 u8 val[3]; 597 598 retval = mutex_lock_interruptible(&data->sysfs_mutex); 599 if (retval) 600 return retval; 601 602 disable_irq(client->irq); 603 604 data->mode |= ETP_ENABLE_CALIBRATE; 605 retval = data->ops->set_mode(client, data->mode); 606 if (retval) { 607 dev_err(dev, "failed to enable calibration mode: %d\n", 608 retval); 609 goto out; 610 } 611 612 retval = data->ops->calibrate(client); 613 if (retval) { 614 dev_err(dev, "failed to start calibration: %d\n", 615 retval); 616 goto out_disable_calibrate; 617 } 618 619 val[0] = 0xff; 620 do { 621 /* Wait 250ms before checking if calibration has completed. */ 622 msleep(250); 623 624 retval = data->ops->calibrate_result(client, val); 625 if (retval) 626 dev_err(dev, "failed to check calibration result: %d\n", 627 retval); 628 else if (val[0] == 0) 629 break; /* calibration done */ 630 631 } while (--tries); 632 633 if (tries == 0) { 634 dev_err(dev, "failed to calibrate. Timeout.\n"); 635 retval = -ETIMEDOUT; 636 } 637 638 out_disable_calibrate: 639 data->mode &= ~ETP_ENABLE_CALIBRATE; 640 error = data->ops->set_mode(data->client, data->mode); 641 if (error) { 642 dev_err(dev, "failed to disable calibration mode: %d\n", 643 error); 644 if (!retval) 645 retval = error; 646 } 647 out: 648 enable_irq(client->irq); 649 mutex_unlock(&data->sysfs_mutex); 650 return retval ?: count; 651 } 652 653 static ssize_t elan_sysfs_read_mode(struct device *dev, 654 struct device_attribute *attr, 655 char *buf) 656 { 657 struct i2c_client *client = to_i2c_client(dev); 658 struct elan_tp_data *data = i2c_get_clientdata(client); 659 int error; 660 enum tp_mode mode; 661 662 error = mutex_lock_interruptible(&data->sysfs_mutex); 663 if (error) 664 return error; 665 666 error = data->ops->iap_get_mode(data->client, &mode); 667 668 mutex_unlock(&data->sysfs_mutex); 669 670 if (error) 671 return error; 672 673 return sprintf(buf, "%d\n", (int)mode); 674 } 675 676 static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL); 677 static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL); 678 static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL); 679 static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL); 680 static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL); 681 static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL); 682 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw); 683 684 static DEVICE_ATTR_WO(calibrate); 685 686 static struct attribute *elan_sysfs_entries[] = { 687 &dev_attr_product_id.attr, 688 &dev_attr_firmware_version.attr, 689 &dev_attr_sample_version.attr, 690 &dev_attr_iap_version.attr, 691 &dev_attr_fw_checksum.attr, 692 &dev_attr_calibrate.attr, 693 &dev_attr_mode.attr, 694 &dev_attr_update_fw.attr, 695 NULL, 696 }; 697 698 static const struct attribute_group elan_sysfs_group = { 699 .attrs = elan_sysfs_entries, 700 }; 701 702 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr, 703 const char *buf, size_t count) 704 { 705 struct i2c_client *client = to_i2c_client(dev); 706 struct elan_tp_data *data = i2c_get_clientdata(client); 707 int error; 708 int retval; 709 710 retval = mutex_lock_interruptible(&data->sysfs_mutex); 711 if (retval) 712 return retval; 713 714 disable_irq(client->irq); 715 716 data->baseline_ready = false; 717 718 data->mode |= ETP_ENABLE_CALIBRATE; 719 retval = data->ops->set_mode(data->client, data->mode); 720 if (retval) { 721 dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n", 722 retval); 723 goto out; 724 } 725 726 msleep(250); 727 728 retval = data->ops->get_baseline_data(data->client, true, 729 &data->max_baseline); 730 if (retval) { 731 dev_err(dev, "Failed to read max baseline form device: %d\n", 732 retval); 733 goto out_disable_calibrate; 734 } 735 736 retval = data->ops->get_baseline_data(data->client, false, 737 &data->min_baseline); 738 if (retval) { 739 dev_err(dev, "Failed to read min baseline form device: %d\n", 740 retval); 741 goto out_disable_calibrate; 742 } 743 744 data->baseline_ready = true; 745 746 out_disable_calibrate: 747 data->mode &= ~ETP_ENABLE_CALIBRATE; 748 error = data->ops->set_mode(data->client, data->mode); 749 if (error) { 750 dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n", 751 error); 752 if (!retval) 753 retval = error; 754 } 755 out: 756 enable_irq(client->irq); 757 mutex_unlock(&data->sysfs_mutex); 758 return retval ?: count; 759 } 760 761 static ssize_t min_show(struct device *dev, 762 struct device_attribute *attr, char *buf) 763 { 764 struct i2c_client *client = to_i2c_client(dev); 765 struct elan_tp_data *data = i2c_get_clientdata(client); 766 int retval; 767 768 retval = mutex_lock_interruptible(&data->sysfs_mutex); 769 if (retval) 770 return retval; 771 772 if (!data->baseline_ready) { 773 retval = -ENODATA; 774 goto out; 775 } 776 777 retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline); 778 779 out: 780 mutex_unlock(&data->sysfs_mutex); 781 return retval; 782 } 783 784 static ssize_t max_show(struct device *dev, 785 struct device_attribute *attr, char *buf) 786 { 787 struct i2c_client *client = to_i2c_client(dev); 788 struct elan_tp_data *data = i2c_get_clientdata(client); 789 int retval; 790 791 retval = mutex_lock_interruptible(&data->sysfs_mutex); 792 if (retval) 793 return retval; 794 795 if (!data->baseline_ready) { 796 retval = -ENODATA; 797 goto out; 798 } 799 800 retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline); 801 802 out: 803 mutex_unlock(&data->sysfs_mutex); 804 return retval; 805 } 806 807 808 static DEVICE_ATTR_WO(acquire); 809 static DEVICE_ATTR_RO(min); 810 static DEVICE_ATTR_RO(max); 811 812 static struct attribute *elan_baseline_sysfs_entries[] = { 813 &dev_attr_acquire.attr, 814 &dev_attr_min.attr, 815 &dev_attr_max.attr, 816 NULL, 817 }; 818 819 static const struct attribute_group elan_baseline_sysfs_group = { 820 .name = "baseline", 821 .attrs = elan_baseline_sysfs_entries, 822 }; 823 824 static const struct attribute_group *elan_sysfs_groups[] = { 825 &elan_sysfs_group, 826 &elan_baseline_sysfs_group, 827 NULL 828 }; 829 830 /* 831 ****************************************************************** 832 * Elan isr functions 833 ****************************************************************** 834 */ 835 static void elan_report_contact(struct elan_tp_data *data, 836 int contact_num, bool contact_valid, 837 u8 *finger_data) 838 { 839 struct input_dev *input = data->input; 840 unsigned int pos_x, pos_y; 841 unsigned int pressure, mk_x, mk_y; 842 unsigned int area_x, area_y, major, minor; 843 unsigned int scaled_pressure; 844 845 if (contact_valid) { 846 pos_x = ((finger_data[0] & 0xf0) << 4) | 847 finger_data[1]; 848 pos_y = ((finger_data[0] & 0x0f) << 8) | 849 finger_data[2]; 850 mk_x = (finger_data[3] & 0x0f); 851 mk_y = (finger_data[3] >> 4); 852 pressure = finger_data[4]; 853 854 if (pos_x > data->max_x || pos_y > data->max_y) { 855 dev_dbg(input->dev.parent, 856 "[%d] x=%d y=%d over max (%d, %d)", 857 contact_num, pos_x, pos_y, 858 data->max_x, data->max_y); 859 return; 860 } 861 862 /* 863 * To avoid treating large finger as palm, let's reduce the 864 * width x and y per trace. 865 */ 866 area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE); 867 area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE); 868 869 major = max(area_x, area_y); 870 minor = min(area_x, area_y); 871 872 scaled_pressure = pressure + data->pressure_adjustment; 873 874 if (scaled_pressure > ETP_MAX_PRESSURE) 875 scaled_pressure = ETP_MAX_PRESSURE; 876 877 input_mt_slot(input, contact_num); 878 input_mt_report_slot_state(input, MT_TOOL_FINGER, true); 879 input_report_abs(input, ABS_MT_POSITION_X, pos_x); 880 input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y); 881 input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure); 882 input_report_abs(input, ABS_TOOL_WIDTH, mk_x); 883 input_report_abs(input, ABS_MT_TOUCH_MAJOR, major); 884 input_report_abs(input, ABS_MT_TOUCH_MINOR, minor); 885 } else { 886 input_mt_slot(input, contact_num); 887 input_mt_report_slot_state(input, MT_TOOL_FINGER, false); 888 } 889 } 890 891 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet) 892 { 893 struct input_dev *input = data->input; 894 u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET]; 895 int i; 896 u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET]; 897 u8 hover_info = packet[ETP_HOVER_INFO_OFFSET]; 898 bool contact_valid, hover_event; 899 900 hover_event = hover_info & 0x40; 901 for (i = 0; i < ETP_MAX_FINGERS; i++) { 902 contact_valid = tp_info & (1U << (3 + i)); 903 elan_report_contact(data, i, contact_valid, finger_data); 904 905 if (contact_valid) 906 finger_data += ETP_FINGER_DATA_LEN; 907 } 908 909 input_report_key(input, BTN_LEFT, tp_info & 0x01); 910 input_report_abs(input, ABS_DISTANCE, hover_event != 0); 911 input_mt_report_pointer_emulation(input, true); 912 input_sync(input); 913 } 914 915 static irqreturn_t elan_isr(int irq, void *dev_id) 916 { 917 struct elan_tp_data *data = dev_id; 918 struct device *dev = &data->client->dev; 919 int error; 920 u8 report[ETP_MAX_REPORT_LEN]; 921 922 /* 923 * When device is connected to i2c bus, when all IAP page writes 924 * complete, the driver will receive interrupt and must read 925 * 0000 to confirm that IAP is finished. 926 */ 927 if (data->in_fw_update) { 928 complete(&data->fw_completion); 929 goto out; 930 } 931 932 error = data->ops->get_report(data->client, report); 933 if (error) 934 goto out; 935 936 if (report[ETP_REPORT_ID_OFFSET] != ETP_REPORT_ID) 937 dev_err(dev, "invalid report id data (%x)\n", 938 report[ETP_REPORT_ID_OFFSET]); 939 else 940 elan_report_absolute(data, report); 941 942 out: 943 return IRQ_HANDLED; 944 } 945 946 /* 947 ****************************************************************** 948 * Elan initialization functions 949 ****************************************************************** 950 */ 951 static int elan_setup_input_device(struct elan_tp_data *data) 952 { 953 struct device *dev = &data->client->dev; 954 struct input_dev *input; 955 unsigned int max_width = max(data->width_x, data->width_y); 956 unsigned int min_width = min(data->width_x, data->width_y); 957 int error; 958 959 input = devm_input_allocate_device(dev); 960 if (!input) 961 return -ENOMEM; 962 963 input->name = "Elan Touchpad"; 964 input->id.bustype = BUS_I2C; 965 input->id.vendor = ELAN_VENDOR_ID; 966 input->id.product = data->product_id; 967 input_set_drvdata(input, data); 968 969 error = input_mt_init_slots(input, ETP_MAX_FINGERS, 970 INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED); 971 if (error) { 972 dev_err(dev, "failed to initialize MT slots: %d\n", error); 973 return error; 974 } 975 976 __set_bit(EV_ABS, input->evbit); 977 __set_bit(INPUT_PROP_POINTER, input->propbit); 978 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit); 979 __set_bit(BTN_LEFT, input->keybit); 980 981 /* Set up ST parameters */ 982 input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0); 983 input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0); 984 input_abs_set_res(input, ABS_X, data->x_res); 985 input_abs_set_res(input, ABS_Y, data->y_res); 986 input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0); 987 input_set_abs_params(input, ABS_TOOL_WIDTH, 0, ETP_FINGER_WIDTH, 0, 0); 988 input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0); 989 990 /* And MT parameters */ 991 input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0); 992 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0); 993 input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res); 994 input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res); 995 input_set_abs_params(input, ABS_MT_PRESSURE, 0, 996 ETP_MAX_PRESSURE, 0, 0); 997 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 998 ETP_FINGER_WIDTH * max_width, 0, 0); 999 input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 1000 ETP_FINGER_WIDTH * min_width, 0, 0); 1001 1002 data->input = input; 1003 1004 return 0; 1005 } 1006 1007 static void elan_disable_regulator(void *_data) 1008 { 1009 struct elan_tp_data *data = _data; 1010 1011 regulator_disable(data->vcc); 1012 } 1013 1014 static void elan_remove_sysfs_groups(void *_data) 1015 { 1016 struct elan_tp_data *data = _data; 1017 1018 sysfs_remove_groups(&data->client->dev.kobj, elan_sysfs_groups); 1019 } 1020 1021 static int elan_probe(struct i2c_client *client, 1022 const struct i2c_device_id *dev_id) 1023 { 1024 const struct elan_transport_ops *transport_ops; 1025 struct device *dev = &client->dev; 1026 struct elan_tp_data *data; 1027 unsigned long irqflags; 1028 int error; 1029 1030 if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) && 1031 i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { 1032 transport_ops = &elan_i2c_ops; 1033 } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) && 1034 i2c_check_functionality(client->adapter, 1035 I2C_FUNC_SMBUS_BYTE_DATA | 1036 I2C_FUNC_SMBUS_BLOCK_DATA | 1037 I2C_FUNC_SMBUS_I2C_BLOCK)) { 1038 transport_ops = &elan_smbus_ops; 1039 } else { 1040 dev_err(dev, "not a supported I2C/SMBus adapter\n"); 1041 return -EIO; 1042 } 1043 1044 data = devm_kzalloc(dev, sizeof(struct elan_tp_data), GFP_KERNEL); 1045 if (!data) 1046 return -ENOMEM; 1047 1048 i2c_set_clientdata(client, data); 1049 1050 data->ops = transport_ops; 1051 data->client = client; 1052 init_completion(&data->fw_completion); 1053 mutex_init(&data->sysfs_mutex); 1054 1055 data->vcc = devm_regulator_get(dev, "vcc"); 1056 if (IS_ERR(data->vcc)) { 1057 error = PTR_ERR(data->vcc); 1058 if (error != -EPROBE_DEFER) 1059 dev_err(dev, "Failed to get 'vcc' regulator: %d\n", 1060 error); 1061 return error; 1062 } 1063 1064 error = regulator_enable(data->vcc); 1065 if (error) { 1066 dev_err(dev, "Failed to enable regulator: %d\n", error); 1067 return error; 1068 } 1069 1070 error = devm_add_action(dev, elan_disable_regulator, data); 1071 if (error) { 1072 regulator_disable(data->vcc); 1073 dev_err(dev, "Failed to add disable regulator action: %d\n", 1074 error); 1075 return error; 1076 } 1077 1078 /* Initialize the touchpad. */ 1079 error = elan_initialize(data); 1080 if (error) 1081 return error; 1082 1083 error = elan_query_device_info(data); 1084 if (error) 1085 return error; 1086 1087 error = elan_query_device_parameters(data); 1088 if (error) 1089 return error; 1090 1091 dev_info(dev, 1092 "Elan Touchpad: Module ID: 0x%04x, Firmware: 0x%04x, Sample: 0x%04x, IAP: 0x%04x\n", 1093 data->product_id, 1094 data->fw_version, 1095 data->sm_version, 1096 data->iap_version); 1097 1098 dev_dbg(dev, 1099 "Elan Touchpad Extra Information:\n" 1100 " Max ABS X,Y: %d,%d\n" 1101 " Width X,Y: %d,%d\n" 1102 " Resolution X,Y: %d,%d (dots/mm)\n", 1103 data->max_x, data->max_y, 1104 data->width_x, data->width_y, 1105 data->x_res, data->y_res); 1106 1107 /* Set up input device properties based on queried parameters. */ 1108 error = elan_setup_input_device(data); 1109 if (error) 1110 return error; 1111 1112 /* 1113 * Systems using device tree should set up interrupt via DTS, 1114 * the rest will use the default falling edge interrupts. 1115 */ 1116 irqflags = dev->of_node ? 0 : IRQF_TRIGGER_FALLING; 1117 1118 error = devm_request_threaded_irq(dev, client->irq, NULL, elan_isr, 1119 irqflags | IRQF_ONESHOT, 1120 client->name, data); 1121 if (error) { 1122 dev_err(dev, "cannot register irq=%d\n", client->irq); 1123 return error; 1124 } 1125 1126 error = sysfs_create_groups(&dev->kobj, elan_sysfs_groups); 1127 if (error) { 1128 dev_err(dev, "failed to create sysfs attributes: %d\n", error); 1129 return error; 1130 } 1131 1132 error = devm_add_action(dev, elan_remove_sysfs_groups, data); 1133 if (error) { 1134 elan_remove_sysfs_groups(data); 1135 dev_err(dev, "Failed to add sysfs cleanup action: %d\n", 1136 error); 1137 return error; 1138 } 1139 1140 error = input_register_device(data->input); 1141 if (error) { 1142 dev_err(dev, "failed to register input device: %d\n", error); 1143 return error; 1144 } 1145 1146 /* 1147 * Systems using device tree should set up wakeup via DTS, 1148 * the rest will configure device as wakeup source by default. 1149 */ 1150 if (!dev->of_node) 1151 device_init_wakeup(dev, true); 1152 1153 return 0; 1154 } 1155 1156 static int __maybe_unused elan_suspend(struct device *dev) 1157 { 1158 struct i2c_client *client = to_i2c_client(dev); 1159 struct elan_tp_data *data = i2c_get_clientdata(client); 1160 int ret; 1161 1162 /* 1163 * We are taking the mutex to make sure sysfs operations are 1164 * complete before we attempt to bring the device into low[er] 1165 * power mode. 1166 */ 1167 ret = mutex_lock_interruptible(&data->sysfs_mutex); 1168 if (ret) 1169 return ret; 1170 1171 disable_irq(client->irq); 1172 1173 if (device_may_wakeup(dev)) { 1174 ret = elan_sleep(data); 1175 /* Enable wake from IRQ */ 1176 data->irq_wake = (enable_irq_wake(client->irq) == 0); 1177 } else { 1178 ret = elan_disable_power(data); 1179 } 1180 1181 mutex_unlock(&data->sysfs_mutex); 1182 return ret; 1183 } 1184 1185 static int __maybe_unused elan_resume(struct device *dev) 1186 { 1187 struct i2c_client *client = to_i2c_client(dev); 1188 struct elan_tp_data *data = i2c_get_clientdata(client); 1189 int error; 1190 1191 if (device_may_wakeup(dev) && data->irq_wake) { 1192 disable_irq_wake(client->irq); 1193 data->irq_wake = false; 1194 } 1195 1196 error = elan_enable_power(data); 1197 if (error) { 1198 dev_err(dev, "power up when resuming failed: %d\n", error); 1199 goto err; 1200 } 1201 1202 error = elan_initialize(data); 1203 if (error) 1204 dev_err(dev, "initialize when resuming failed: %d\n", error); 1205 1206 err: 1207 enable_irq(data->client->irq); 1208 return error; 1209 } 1210 1211 static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume); 1212 1213 static const struct i2c_device_id elan_id[] = { 1214 { DRIVER_NAME, 0 }, 1215 { }, 1216 }; 1217 MODULE_DEVICE_TABLE(i2c, elan_id); 1218 1219 #ifdef CONFIG_ACPI 1220 static const struct acpi_device_id elan_acpi_id[] = { 1221 { "ELAN0000", 0 }, 1222 { "ELAN0100", 0 }, 1223 { "ELAN0600", 0 }, 1224 { "ELAN0605", 0 }, 1225 { "ELAN1000", 0 }, 1226 { } 1227 }; 1228 MODULE_DEVICE_TABLE(acpi, elan_acpi_id); 1229 #endif 1230 1231 #ifdef CONFIG_OF 1232 static const struct of_device_id elan_of_match[] = { 1233 { .compatible = "elan,ekth3000" }, 1234 { /* sentinel */ } 1235 }; 1236 MODULE_DEVICE_TABLE(of, elan_of_match); 1237 #endif 1238 1239 static struct i2c_driver elan_driver = { 1240 .driver = { 1241 .name = DRIVER_NAME, 1242 .pm = &elan_pm_ops, 1243 .acpi_match_table = ACPI_PTR(elan_acpi_id), 1244 .of_match_table = of_match_ptr(elan_of_match), 1245 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1246 }, 1247 .probe = elan_probe, 1248 .id_table = elan_id, 1249 }; 1250 1251 module_i2c_driver(elan_driver); 1252 1253 MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>"); 1254 MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver"); 1255 MODULE_LICENSE("GPL"); 1256 MODULE_VERSION(ELAN_DRIVER_VERSION); 1257