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: 1.6.3 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/irq.h> 30 #include <linux/module.h> 31 #include <linux/slab.h> 32 #include <linux/kernel.h> 33 #include <linux/sched.h> 34 #include <linux/input.h> 35 #include <linux/uaccess.h> 36 #include <linux/jiffies.h> 37 #include <linux/completion.h> 38 #include <linux/of.h> 39 #include <linux/property.h> 40 #include <linux/regulator/consumer.h> 41 #include <asm/unaligned.h> 42 43 #include "elan_i2c.h" 44 45 #define DRIVER_NAME "elan_i2c" 46 #define ELAN_VENDOR_ID 0x04f3 47 #define ETP_MAX_PRESSURE 255 48 #define ETP_FWIDTH_REDUCE 90 49 #define ETP_FINGER_WIDTH 15 50 #define ETP_RETRY_COUNT 3 51 52 #define ETP_MAX_FINGERS 5 53 #define ETP_FINGER_DATA_LEN 5 54 #define ETP_REPORT_ID 0x5D 55 #define ETP_TP_REPORT_ID 0x5E 56 #define ETP_REPORT_ID_OFFSET 2 57 #define ETP_TOUCH_INFO_OFFSET 3 58 #define ETP_FINGER_DATA_OFFSET 4 59 #define ETP_HOVER_INFO_OFFSET 30 60 #define ETP_MAX_REPORT_LEN 34 61 62 /* The main device structure */ 63 struct elan_tp_data { 64 struct i2c_client *client; 65 struct input_dev *input; 66 struct input_dev *tp_input; /* trackpoint input node */ 67 struct regulator *vcc; 68 69 const struct elan_transport_ops *ops; 70 71 /* for fw update */ 72 struct completion fw_completion; 73 bool in_fw_update; 74 75 struct mutex sysfs_mutex; 76 77 unsigned int max_x; 78 unsigned int max_y; 79 unsigned int width_x; 80 unsigned int width_y; 81 unsigned int x_res; 82 unsigned int y_res; 83 84 u8 pattern; 85 u16 product_id; 86 u8 fw_version; 87 u8 sm_version; 88 u8 iap_version; 89 u16 fw_checksum; 90 int pressure_adjustment; 91 u8 mode; 92 u16 ic_type; 93 u16 fw_validpage_count; 94 u16 fw_signature_address; 95 96 bool irq_wake; 97 98 u8 min_baseline; 99 u8 max_baseline; 100 bool baseline_ready; 101 u8 clickpad; 102 }; 103 104 static int elan_get_fwinfo(u16 ic_type, u16 *validpage_count, 105 u16 *signature_address) 106 { 107 switch (ic_type) { 108 case 0x00: 109 case 0x06: 110 case 0x08: 111 *validpage_count = 512; 112 break; 113 case 0x03: 114 case 0x07: 115 case 0x09: 116 case 0x0A: 117 case 0x0B: 118 case 0x0C: 119 *validpage_count = 768; 120 break; 121 case 0x0D: 122 *validpage_count = 896; 123 break; 124 case 0x0E: 125 *validpage_count = 640; 126 break; 127 case 0x10: 128 *validpage_count = 1024; 129 break; 130 default: 131 /* unknown ic type clear value */ 132 *validpage_count = 0; 133 *signature_address = 0; 134 return -ENXIO; 135 } 136 137 *signature_address = 138 (*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE; 139 140 return 0; 141 } 142 143 static int elan_enable_power(struct elan_tp_data *data) 144 { 145 int repeat = ETP_RETRY_COUNT; 146 int error; 147 148 error = regulator_enable(data->vcc); 149 if (error) { 150 dev_err(&data->client->dev, 151 "failed to enable regulator: %d\n", error); 152 return error; 153 } 154 155 do { 156 error = data->ops->power_control(data->client, true); 157 if (error >= 0) 158 return 0; 159 160 msleep(30); 161 } while (--repeat > 0); 162 163 dev_err(&data->client->dev, "failed to enable power: %d\n", error); 164 return error; 165 } 166 167 static int elan_disable_power(struct elan_tp_data *data) 168 { 169 int repeat = ETP_RETRY_COUNT; 170 int error; 171 172 do { 173 error = data->ops->power_control(data->client, false); 174 if (!error) { 175 error = regulator_disable(data->vcc); 176 if (error) { 177 dev_err(&data->client->dev, 178 "failed to disable regulator: %d\n", 179 error); 180 /* Attempt to power the chip back up */ 181 data->ops->power_control(data->client, true); 182 break; 183 } 184 185 return 0; 186 } 187 188 msleep(30); 189 } while (--repeat > 0); 190 191 dev_err(&data->client->dev, "failed to disable power: %d\n", error); 192 return error; 193 } 194 195 static int elan_sleep(struct elan_tp_data *data) 196 { 197 int repeat = ETP_RETRY_COUNT; 198 int error; 199 200 do { 201 error = data->ops->sleep_control(data->client, true); 202 if (!error) 203 return 0; 204 205 msleep(30); 206 } while (--repeat > 0); 207 208 return error; 209 } 210 211 static int elan_query_product(struct elan_tp_data *data) 212 { 213 int error; 214 215 error = data->ops->get_product_id(data->client, &data->product_id); 216 if (error) 217 return error; 218 219 error = data->ops->get_sm_version(data->client, &data->ic_type, 220 &data->sm_version, &data->clickpad); 221 if (error) 222 return error; 223 224 return 0; 225 } 226 227 static int elan_check_ASUS_special_fw(struct elan_tp_data *data) 228 { 229 if (data->ic_type == 0x0E) { 230 switch (data->product_id) { 231 case 0x05 ... 0x07: 232 case 0x09: 233 case 0x13: 234 return true; 235 } 236 } else if (data->ic_type == 0x08 && data->product_id == 0x26) { 237 /* ASUS EeeBook X205TA */ 238 return true; 239 } 240 241 return false; 242 } 243 244 static int __elan_initialize(struct elan_tp_data *data) 245 { 246 struct i2c_client *client = data->client; 247 bool woken_up = false; 248 int error; 249 250 error = data->ops->initialize(client); 251 if (error) { 252 dev_err(&client->dev, "device initialize failed: %d\n", error); 253 return error; 254 } 255 256 error = elan_query_product(data); 257 if (error) 258 return error; 259 260 /* 261 * Some ASUS devices were shipped with firmware that requires 262 * touchpads to be woken up first, before attempting to switch 263 * them into absolute reporting mode. 264 */ 265 if (elan_check_ASUS_special_fw(data)) { 266 error = data->ops->sleep_control(client, false); 267 if (error) { 268 dev_err(&client->dev, 269 "failed to wake device up: %d\n", error); 270 return error; 271 } 272 273 msleep(200); 274 woken_up = true; 275 } 276 277 data->mode |= ETP_ENABLE_ABS; 278 error = data->ops->set_mode(client, data->mode); 279 if (error) { 280 dev_err(&client->dev, 281 "failed to switch to absolute mode: %d\n", error); 282 return error; 283 } 284 285 if (!woken_up) { 286 error = data->ops->sleep_control(client, false); 287 if (error) { 288 dev_err(&client->dev, 289 "failed to wake device up: %d\n", error); 290 return error; 291 } 292 } 293 294 return 0; 295 } 296 297 static int elan_initialize(struct elan_tp_data *data) 298 { 299 int repeat = ETP_RETRY_COUNT; 300 int error; 301 302 do { 303 error = __elan_initialize(data); 304 if (!error) 305 return 0; 306 307 msleep(30); 308 } while (--repeat > 0); 309 310 return error; 311 } 312 313 static int elan_query_device_info(struct elan_tp_data *data) 314 { 315 int error; 316 u16 ic_type; 317 318 error = data->ops->get_version(data->client, false, &data->fw_version); 319 if (error) 320 return error; 321 322 error = data->ops->get_checksum(data->client, false, 323 &data->fw_checksum); 324 if (error) 325 return error; 326 327 error = data->ops->get_version(data->client, true, &data->iap_version); 328 if (error) 329 return error; 330 331 error = data->ops->get_pressure_adjustment(data->client, 332 &data->pressure_adjustment); 333 if (error) 334 return error; 335 336 error = data->ops->get_pattern(data->client, &data->pattern); 337 if (error) 338 return error; 339 340 if (data->pattern == 0x01) 341 ic_type = data->ic_type; 342 else 343 ic_type = data->iap_version; 344 345 error = elan_get_fwinfo(ic_type, &data->fw_validpage_count, 346 &data->fw_signature_address); 347 if (error) 348 dev_warn(&data->client->dev, 349 "unexpected iap version %#04x (ic type: %#04x), firmware update will not work\n", 350 data->iap_version, data->ic_type); 351 352 return 0; 353 } 354 355 static unsigned int elan_convert_resolution(u8 val) 356 { 357 /* 358 * (value from firmware) * 10 + 790 = dpi 359 * 360 * We also have to convert dpi to dots/mm (*10/254 to avoid floating 361 * point). 362 */ 363 364 return ((int)(char)val * 10 + 790) * 10 / 254; 365 } 366 367 static int elan_query_device_parameters(struct elan_tp_data *data) 368 { 369 unsigned int x_traces, y_traces; 370 u8 hw_x_res, hw_y_res; 371 int error; 372 373 error = data->ops->get_max(data->client, &data->max_x, &data->max_y); 374 if (error) 375 return error; 376 377 error = data->ops->get_num_traces(data->client, &x_traces, &y_traces); 378 if (error) 379 return error; 380 381 data->width_x = data->max_x / x_traces; 382 data->width_y = data->max_y / y_traces; 383 384 error = data->ops->get_resolution(data->client, &hw_x_res, &hw_y_res); 385 if (error) 386 return error; 387 388 data->x_res = elan_convert_resolution(hw_x_res); 389 data->y_res = elan_convert_resolution(hw_y_res); 390 391 return 0; 392 } 393 394 /* 395 ********************************************************** 396 * IAP firmware updater related routines 397 ********************************************************** 398 */ 399 static int elan_write_fw_block(struct elan_tp_data *data, 400 const u8 *page, u16 checksum, int idx) 401 { 402 int retry = ETP_RETRY_COUNT; 403 int error; 404 405 do { 406 error = data->ops->write_fw_block(data->client, 407 page, checksum, idx); 408 if (!error) 409 return 0; 410 411 dev_dbg(&data->client->dev, 412 "IAP retrying page %d (error: %d)\n", idx, error); 413 } while (--retry > 0); 414 415 return error; 416 } 417 418 static int __elan_update_firmware(struct elan_tp_data *data, 419 const struct firmware *fw) 420 { 421 struct i2c_client *client = data->client; 422 struct device *dev = &client->dev; 423 int i, j; 424 int error; 425 u16 iap_start_addr; 426 u16 boot_page_count; 427 u16 sw_checksum = 0, fw_checksum = 0; 428 429 error = data->ops->prepare_fw_update(client); 430 if (error) 431 return error; 432 433 iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]); 434 435 boot_page_count = (iap_start_addr * 2) / ETP_FW_PAGE_SIZE; 436 for (i = boot_page_count; i < data->fw_validpage_count; i++) { 437 u16 checksum = 0; 438 const u8 *page = &fw->data[i * ETP_FW_PAGE_SIZE]; 439 440 for (j = 0; j < ETP_FW_PAGE_SIZE; j += 2) 441 checksum += ((page[j + 1] << 8) | page[j]); 442 443 error = elan_write_fw_block(data, page, checksum, i); 444 if (error) { 445 dev_err(dev, "write page %d fail: %d\n", i, error); 446 return error; 447 } 448 449 sw_checksum += checksum; 450 } 451 452 /* Wait WDT reset and power on reset */ 453 msleep(600); 454 455 error = data->ops->finish_fw_update(client, &data->fw_completion); 456 if (error) 457 return error; 458 459 error = data->ops->get_checksum(client, true, &fw_checksum); 460 if (error) 461 return error; 462 463 if (sw_checksum != fw_checksum) { 464 dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n", 465 sw_checksum, fw_checksum); 466 return -EIO; 467 } 468 469 return 0; 470 } 471 472 static int elan_update_firmware(struct elan_tp_data *data, 473 const struct firmware *fw) 474 { 475 struct i2c_client *client = data->client; 476 int retval; 477 478 dev_dbg(&client->dev, "Starting firmware update....\n"); 479 480 disable_irq(client->irq); 481 data->in_fw_update = true; 482 483 retval = __elan_update_firmware(data, fw); 484 if (retval) { 485 dev_err(&client->dev, "firmware update failed: %d\n", retval); 486 data->ops->iap_reset(client); 487 } else { 488 /* Reinitialize TP after fw is updated */ 489 elan_initialize(data); 490 elan_query_device_info(data); 491 } 492 493 data->in_fw_update = false; 494 enable_irq(client->irq); 495 496 return retval; 497 } 498 499 /* 500 ******************************************************************* 501 * SYSFS attributes 502 ******************************************************************* 503 */ 504 static ssize_t elan_sysfs_read_fw_checksum(struct device *dev, 505 struct device_attribute *attr, 506 char *buf) 507 { 508 struct i2c_client *client = to_i2c_client(dev); 509 struct elan_tp_data *data = i2c_get_clientdata(client); 510 511 return sprintf(buf, "0x%04x\n", data->fw_checksum); 512 } 513 514 static ssize_t elan_sysfs_read_product_id(struct device *dev, 515 struct device_attribute *attr, 516 char *buf) 517 { 518 struct i2c_client *client = to_i2c_client(dev); 519 struct elan_tp_data *data = i2c_get_clientdata(client); 520 521 return sprintf(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n", 522 data->product_id); 523 } 524 525 static ssize_t elan_sysfs_read_fw_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->fw_version); 533 } 534 535 static ssize_t elan_sysfs_read_sm_ver(struct device *dev, 536 struct device_attribute *attr, 537 char *buf) 538 { 539 struct i2c_client *client = to_i2c_client(dev); 540 struct elan_tp_data *data = i2c_get_clientdata(client); 541 542 return sprintf(buf, "%d.0\n", data->sm_version); 543 } 544 545 static ssize_t elan_sysfs_read_iap_ver(struct device *dev, 546 struct device_attribute *attr, 547 char *buf) 548 { 549 struct i2c_client *client = to_i2c_client(dev); 550 struct elan_tp_data *data = i2c_get_clientdata(client); 551 552 return sprintf(buf, "%d.0\n", data->iap_version); 553 } 554 555 static ssize_t elan_sysfs_update_fw(struct device *dev, 556 struct device_attribute *attr, 557 const char *buf, size_t count) 558 { 559 struct elan_tp_data *data = dev_get_drvdata(dev); 560 const struct firmware *fw; 561 char *fw_name; 562 int error; 563 const u8 *fw_signature; 564 static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF}; 565 566 if (data->fw_validpage_count == 0) 567 return -EINVAL; 568 569 /* Look for a firmware with the product id appended. */ 570 fw_name = kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id); 571 if (!fw_name) { 572 dev_err(dev, "failed to allocate memory for firmware name\n"); 573 return -ENOMEM; 574 } 575 576 dev_info(dev, "requesting fw '%s'\n", fw_name); 577 error = request_firmware(&fw, fw_name, dev); 578 kfree(fw_name); 579 if (error) { 580 dev_err(dev, "failed to request firmware: %d\n", error); 581 return error; 582 } 583 584 /* Firmware file must match signature data */ 585 fw_signature = &fw->data[data->fw_signature_address]; 586 if (memcmp(fw_signature, signature, sizeof(signature)) != 0) { 587 dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n", 588 (int)sizeof(signature), signature, 589 (int)sizeof(signature), fw_signature); 590 error = -EBADF; 591 goto out_release_fw; 592 } 593 594 error = mutex_lock_interruptible(&data->sysfs_mutex); 595 if (error) 596 goto out_release_fw; 597 598 error = elan_update_firmware(data, fw); 599 600 mutex_unlock(&data->sysfs_mutex); 601 602 out_release_fw: 603 release_firmware(fw); 604 return error ?: count; 605 } 606 607 static ssize_t calibrate_store(struct device *dev, 608 struct device_attribute *attr, 609 const char *buf, size_t count) 610 { 611 struct i2c_client *client = to_i2c_client(dev); 612 struct elan_tp_data *data = i2c_get_clientdata(client); 613 int tries = 20; 614 int retval; 615 int error; 616 u8 val[ETP_CALIBRATE_MAX_LEN]; 617 618 retval = mutex_lock_interruptible(&data->sysfs_mutex); 619 if (retval) 620 return retval; 621 622 disable_irq(client->irq); 623 624 data->mode |= ETP_ENABLE_CALIBRATE; 625 retval = data->ops->set_mode(client, data->mode); 626 if (retval) { 627 dev_err(dev, "failed to enable calibration mode: %d\n", 628 retval); 629 goto out; 630 } 631 632 retval = data->ops->calibrate(client); 633 if (retval) { 634 dev_err(dev, "failed to start calibration: %d\n", 635 retval); 636 goto out_disable_calibrate; 637 } 638 639 val[0] = 0xff; 640 do { 641 /* Wait 250ms before checking if calibration has completed. */ 642 msleep(250); 643 644 retval = data->ops->calibrate_result(client, val); 645 if (retval) 646 dev_err(dev, "failed to check calibration result: %d\n", 647 retval); 648 else if (val[0] == 0) 649 break; /* calibration done */ 650 651 } while (--tries); 652 653 if (tries == 0) { 654 dev_err(dev, "failed to calibrate. Timeout.\n"); 655 retval = -ETIMEDOUT; 656 } 657 658 out_disable_calibrate: 659 data->mode &= ~ETP_ENABLE_CALIBRATE; 660 error = data->ops->set_mode(data->client, data->mode); 661 if (error) { 662 dev_err(dev, "failed to disable calibration mode: %d\n", 663 error); 664 if (!retval) 665 retval = error; 666 } 667 out: 668 enable_irq(client->irq); 669 mutex_unlock(&data->sysfs_mutex); 670 return retval ?: count; 671 } 672 673 static ssize_t elan_sysfs_read_mode(struct device *dev, 674 struct device_attribute *attr, 675 char *buf) 676 { 677 struct i2c_client *client = to_i2c_client(dev); 678 struct elan_tp_data *data = i2c_get_clientdata(client); 679 int error; 680 enum tp_mode mode; 681 682 error = mutex_lock_interruptible(&data->sysfs_mutex); 683 if (error) 684 return error; 685 686 error = data->ops->iap_get_mode(data->client, &mode); 687 688 mutex_unlock(&data->sysfs_mutex); 689 690 if (error) 691 return error; 692 693 return sprintf(buf, "%d\n", (int)mode); 694 } 695 696 static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL); 697 static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL); 698 static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL); 699 static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL); 700 static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL); 701 static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL); 702 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw); 703 704 static DEVICE_ATTR_WO(calibrate); 705 706 static struct attribute *elan_sysfs_entries[] = { 707 &dev_attr_product_id.attr, 708 &dev_attr_firmware_version.attr, 709 &dev_attr_sample_version.attr, 710 &dev_attr_iap_version.attr, 711 &dev_attr_fw_checksum.attr, 712 &dev_attr_calibrate.attr, 713 &dev_attr_mode.attr, 714 &dev_attr_update_fw.attr, 715 NULL, 716 }; 717 718 static const struct attribute_group elan_sysfs_group = { 719 .attrs = elan_sysfs_entries, 720 }; 721 722 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr, 723 const char *buf, size_t count) 724 { 725 struct i2c_client *client = to_i2c_client(dev); 726 struct elan_tp_data *data = i2c_get_clientdata(client); 727 int error; 728 int retval; 729 730 retval = mutex_lock_interruptible(&data->sysfs_mutex); 731 if (retval) 732 return retval; 733 734 disable_irq(client->irq); 735 736 data->baseline_ready = false; 737 738 data->mode |= ETP_ENABLE_CALIBRATE; 739 retval = data->ops->set_mode(data->client, data->mode); 740 if (retval) { 741 dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n", 742 retval); 743 goto out; 744 } 745 746 msleep(250); 747 748 retval = data->ops->get_baseline_data(data->client, true, 749 &data->max_baseline); 750 if (retval) { 751 dev_err(dev, "Failed to read max baseline form device: %d\n", 752 retval); 753 goto out_disable_calibrate; 754 } 755 756 retval = data->ops->get_baseline_data(data->client, false, 757 &data->min_baseline); 758 if (retval) { 759 dev_err(dev, "Failed to read min baseline form device: %d\n", 760 retval); 761 goto out_disable_calibrate; 762 } 763 764 data->baseline_ready = true; 765 766 out_disable_calibrate: 767 data->mode &= ~ETP_ENABLE_CALIBRATE; 768 error = data->ops->set_mode(data->client, data->mode); 769 if (error) { 770 dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n", 771 error); 772 if (!retval) 773 retval = error; 774 } 775 out: 776 enable_irq(client->irq); 777 mutex_unlock(&data->sysfs_mutex); 778 return retval ?: count; 779 } 780 781 static ssize_t min_show(struct device *dev, 782 struct device_attribute *attr, char *buf) 783 { 784 struct i2c_client *client = to_i2c_client(dev); 785 struct elan_tp_data *data = i2c_get_clientdata(client); 786 int retval; 787 788 retval = mutex_lock_interruptible(&data->sysfs_mutex); 789 if (retval) 790 return retval; 791 792 if (!data->baseline_ready) { 793 retval = -ENODATA; 794 goto out; 795 } 796 797 retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline); 798 799 out: 800 mutex_unlock(&data->sysfs_mutex); 801 return retval; 802 } 803 804 static ssize_t max_show(struct device *dev, 805 struct device_attribute *attr, char *buf) 806 { 807 struct i2c_client *client = to_i2c_client(dev); 808 struct elan_tp_data *data = i2c_get_clientdata(client); 809 int retval; 810 811 retval = mutex_lock_interruptible(&data->sysfs_mutex); 812 if (retval) 813 return retval; 814 815 if (!data->baseline_ready) { 816 retval = -ENODATA; 817 goto out; 818 } 819 820 retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline); 821 822 out: 823 mutex_unlock(&data->sysfs_mutex); 824 return retval; 825 } 826 827 828 static DEVICE_ATTR_WO(acquire); 829 static DEVICE_ATTR_RO(min); 830 static DEVICE_ATTR_RO(max); 831 832 static struct attribute *elan_baseline_sysfs_entries[] = { 833 &dev_attr_acquire.attr, 834 &dev_attr_min.attr, 835 &dev_attr_max.attr, 836 NULL, 837 }; 838 839 static const struct attribute_group elan_baseline_sysfs_group = { 840 .name = "baseline", 841 .attrs = elan_baseline_sysfs_entries, 842 }; 843 844 static const struct attribute_group *elan_sysfs_groups[] = { 845 &elan_sysfs_group, 846 &elan_baseline_sysfs_group, 847 NULL 848 }; 849 850 /* 851 ****************************************************************** 852 * Elan isr functions 853 ****************************************************************** 854 */ 855 static void elan_report_contact(struct elan_tp_data *data, 856 int contact_num, bool contact_valid, 857 u8 *finger_data) 858 { 859 struct input_dev *input = data->input; 860 unsigned int pos_x, pos_y; 861 unsigned int pressure, mk_x, mk_y; 862 unsigned int area_x, area_y, major, minor; 863 unsigned int scaled_pressure; 864 865 if (contact_valid) { 866 pos_x = ((finger_data[0] & 0xf0) << 4) | 867 finger_data[1]; 868 pos_y = ((finger_data[0] & 0x0f) << 8) | 869 finger_data[2]; 870 mk_x = (finger_data[3] & 0x0f); 871 mk_y = (finger_data[3] >> 4); 872 pressure = finger_data[4]; 873 874 if (pos_x > data->max_x || pos_y > data->max_y) { 875 dev_dbg(input->dev.parent, 876 "[%d] x=%d y=%d over max (%d, %d)", 877 contact_num, pos_x, pos_y, 878 data->max_x, data->max_y); 879 return; 880 } 881 882 /* 883 * To avoid treating large finger as palm, let's reduce the 884 * width x and y per trace. 885 */ 886 area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE); 887 area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE); 888 889 major = max(area_x, area_y); 890 minor = min(area_x, area_y); 891 892 scaled_pressure = pressure + data->pressure_adjustment; 893 894 if (scaled_pressure > ETP_MAX_PRESSURE) 895 scaled_pressure = ETP_MAX_PRESSURE; 896 897 input_mt_slot(input, contact_num); 898 input_mt_report_slot_state(input, MT_TOOL_FINGER, true); 899 input_report_abs(input, ABS_MT_POSITION_X, pos_x); 900 input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y); 901 input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure); 902 input_report_abs(input, ABS_TOOL_WIDTH, mk_x); 903 input_report_abs(input, ABS_MT_TOUCH_MAJOR, major); 904 input_report_abs(input, ABS_MT_TOUCH_MINOR, minor); 905 } else { 906 input_mt_slot(input, contact_num); 907 input_mt_report_slot_state(input, MT_TOOL_FINGER, false); 908 } 909 } 910 911 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet) 912 { 913 struct input_dev *input = data->input; 914 u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET]; 915 int i; 916 u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET]; 917 u8 hover_info = packet[ETP_HOVER_INFO_OFFSET]; 918 bool contact_valid, hover_event; 919 920 hover_event = hover_info & 0x40; 921 for (i = 0; i < ETP_MAX_FINGERS; i++) { 922 contact_valid = tp_info & (1U << (3 + i)); 923 elan_report_contact(data, i, contact_valid, finger_data); 924 925 if (contact_valid) 926 finger_data += ETP_FINGER_DATA_LEN; 927 } 928 929 input_report_key(input, BTN_LEFT, tp_info & 0x01); 930 input_report_key(input, BTN_RIGHT, tp_info & 0x02); 931 input_report_abs(input, ABS_DISTANCE, hover_event != 0); 932 input_mt_report_pointer_emulation(input, true); 933 input_sync(input); 934 } 935 936 static void elan_report_trackpoint(struct elan_tp_data *data, u8 *report) 937 { 938 struct input_dev *input = data->tp_input; 939 u8 *packet = &report[ETP_REPORT_ID_OFFSET + 1]; 940 int x, y; 941 942 if (!data->tp_input) { 943 dev_warn_once(&data->client->dev, 944 "received a trackpoint report while no trackpoint device has been created. Please report upstream.\n"); 945 return; 946 } 947 948 input_report_key(input, BTN_LEFT, packet[0] & 0x01); 949 input_report_key(input, BTN_RIGHT, packet[0] & 0x02); 950 input_report_key(input, BTN_MIDDLE, packet[0] & 0x04); 951 952 if ((packet[3] & 0x0F) == 0x06) { 953 x = packet[4] - (int)((packet[1] ^ 0x80) << 1); 954 y = (int)((packet[2] ^ 0x80) << 1) - packet[5]; 955 956 input_report_rel(input, REL_X, x); 957 input_report_rel(input, REL_Y, y); 958 } 959 960 input_sync(input); 961 } 962 963 static irqreturn_t elan_isr(int irq, void *dev_id) 964 { 965 struct elan_tp_data *data = dev_id; 966 struct device *dev = &data->client->dev; 967 int error; 968 u8 report[ETP_MAX_REPORT_LEN]; 969 970 /* 971 * When device is connected to i2c bus, when all IAP page writes 972 * complete, the driver will receive interrupt and must read 973 * 0000 to confirm that IAP is finished. 974 */ 975 if (data->in_fw_update) { 976 complete(&data->fw_completion); 977 goto out; 978 } 979 980 error = data->ops->get_report(data->client, report); 981 if (error) 982 goto out; 983 984 switch (report[ETP_REPORT_ID_OFFSET]) { 985 case ETP_REPORT_ID: 986 elan_report_absolute(data, report); 987 break; 988 case ETP_TP_REPORT_ID: 989 elan_report_trackpoint(data, report); 990 break; 991 default: 992 dev_err(dev, "invalid report id data (%x)\n", 993 report[ETP_REPORT_ID_OFFSET]); 994 } 995 996 out: 997 return IRQ_HANDLED; 998 } 999 1000 /* 1001 ****************************************************************** 1002 * Elan initialization functions 1003 ****************************************************************** 1004 */ 1005 1006 static int elan_setup_trackpoint_input_device(struct elan_tp_data *data) 1007 { 1008 struct device *dev = &data->client->dev; 1009 struct input_dev *input; 1010 1011 input = devm_input_allocate_device(dev); 1012 if (!input) 1013 return -ENOMEM; 1014 1015 input->name = "Elan TrackPoint"; 1016 input->id.bustype = BUS_I2C; 1017 input->id.vendor = ELAN_VENDOR_ID; 1018 input->id.product = data->product_id; 1019 input_set_drvdata(input, data); 1020 1021 input_set_capability(input, EV_REL, REL_X); 1022 input_set_capability(input, EV_REL, REL_Y); 1023 input_set_capability(input, EV_KEY, BTN_LEFT); 1024 input_set_capability(input, EV_KEY, BTN_RIGHT); 1025 input_set_capability(input, EV_KEY, BTN_MIDDLE); 1026 1027 __set_bit(INPUT_PROP_POINTER, input->propbit); 1028 __set_bit(INPUT_PROP_POINTING_STICK, input->propbit); 1029 1030 data->tp_input = input; 1031 1032 return 0; 1033 } 1034 1035 static int elan_setup_input_device(struct elan_tp_data *data) 1036 { 1037 struct device *dev = &data->client->dev; 1038 struct input_dev *input; 1039 unsigned int max_width = max(data->width_x, data->width_y); 1040 unsigned int min_width = min(data->width_x, data->width_y); 1041 int error; 1042 1043 input = devm_input_allocate_device(dev); 1044 if (!input) 1045 return -ENOMEM; 1046 1047 input->name = "Elan Touchpad"; 1048 input->id.bustype = BUS_I2C; 1049 input->id.vendor = ELAN_VENDOR_ID; 1050 input->id.product = data->product_id; 1051 input_set_drvdata(input, data); 1052 1053 error = input_mt_init_slots(input, ETP_MAX_FINGERS, 1054 INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED); 1055 if (error) { 1056 dev_err(dev, "failed to initialize MT slots: %d\n", error); 1057 return error; 1058 } 1059 1060 __set_bit(EV_ABS, input->evbit); 1061 __set_bit(INPUT_PROP_POINTER, input->propbit); 1062 if (data->clickpad) 1063 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit); 1064 else 1065 __set_bit(BTN_RIGHT, input->keybit); 1066 __set_bit(BTN_LEFT, input->keybit); 1067 1068 /* Set up ST parameters */ 1069 input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0); 1070 input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0); 1071 input_abs_set_res(input, ABS_X, data->x_res); 1072 input_abs_set_res(input, ABS_Y, data->y_res); 1073 input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0); 1074 input_set_abs_params(input, ABS_TOOL_WIDTH, 0, ETP_FINGER_WIDTH, 0, 0); 1075 input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0); 1076 1077 /* And MT parameters */ 1078 input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0); 1079 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0); 1080 input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res); 1081 input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res); 1082 input_set_abs_params(input, ABS_MT_PRESSURE, 0, 1083 ETP_MAX_PRESSURE, 0, 0); 1084 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 1085 ETP_FINGER_WIDTH * max_width, 0, 0); 1086 input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 1087 ETP_FINGER_WIDTH * min_width, 0, 0); 1088 1089 data->input = input; 1090 1091 return 0; 1092 } 1093 1094 static void elan_disable_regulator(void *_data) 1095 { 1096 struct elan_tp_data *data = _data; 1097 1098 regulator_disable(data->vcc); 1099 } 1100 1101 static void elan_remove_sysfs_groups(void *_data) 1102 { 1103 struct elan_tp_data *data = _data; 1104 1105 sysfs_remove_groups(&data->client->dev.kobj, elan_sysfs_groups); 1106 } 1107 1108 static int elan_probe(struct i2c_client *client, 1109 const struct i2c_device_id *dev_id) 1110 { 1111 const struct elan_transport_ops *transport_ops; 1112 struct device *dev = &client->dev; 1113 struct elan_tp_data *data; 1114 unsigned long irqflags; 1115 int error; 1116 1117 if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) && 1118 i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { 1119 transport_ops = &elan_i2c_ops; 1120 } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) && 1121 i2c_check_functionality(client->adapter, 1122 I2C_FUNC_SMBUS_BYTE_DATA | 1123 I2C_FUNC_SMBUS_BLOCK_DATA | 1124 I2C_FUNC_SMBUS_I2C_BLOCK)) { 1125 transport_ops = &elan_smbus_ops; 1126 } else { 1127 dev_err(dev, "not a supported I2C/SMBus adapter\n"); 1128 return -EIO; 1129 } 1130 1131 data = devm_kzalloc(dev, sizeof(struct elan_tp_data), GFP_KERNEL); 1132 if (!data) 1133 return -ENOMEM; 1134 1135 i2c_set_clientdata(client, data); 1136 1137 data->ops = transport_ops; 1138 data->client = client; 1139 init_completion(&data->fw_completion); 1140 mutex_init(&data->sysfs_mutex); 1141 1142 data->vcc = devm_regulator_get(dev, "vcc"); 1143 if (IS_ERR(data->vcc)) { 1144 error = PTR_ERR(data->vcc); 1145 if (error != -EPROBE_DEFER) 1146 dev_err(dev, "Failed to get 'vcc' regulator: %d\n", 1147 error); 1148 return error; 1149 } 1150 1151 error = regulator_enable(data->vcc); 1152 if (error) { 1153 dev_err(dev, "Failed to enable regulator: %d\n", error); 1154 return error; 1155 } 1156 1157 error = devm_add_action(dev, elan_disable_regulator, data); 1158 if (error) { 1159 regulator_disable(data->vcc); 1160 dev_err(dev, "Failed to add disable regulator action: %d\n", 1161 error); 1162 return error; 1163 } 1164 1165 /* Make sure there is something at this address */ 1166 error = i2c_smbus_read_byte(client); 1167 if (error < 0) { 1168 dev_dbg(&client->dev, "nothing at this address: %d\n", error); 1169 return -ENXIO; 1170 } 1171 1172 /* Initialize the touchpad. */ 1173 error = elan_initialize(data); 1174 if (error) 1175 return error; 1176 1177 error = elan_query_device_info(data); 1178 if (error) 1179 return error; 1180 1181 error = elan_query_device_parameters(data); 1182 if (error) 1183 return error; 1184 1185 dev_info(dev, 1186 "Elan Touchpad: Module ID: 0x%04x, Firmware: 0x%04x, Sample: 0x%04x, IAP: 0x%04x\n", 1187 data->product_id, 1188 data->fw_version, 1189 data->sm_version, 1190 data->iap_version); 1191 1192 dev_dbg(dev, 1193 "Elan Touchpad Extra Information:\n" 1194 " Max ABS X,Y: %d,%d\n" 1195 " Width X,Y: %d,%d\n" 1196 " Resolution X,Y: %d,%d (dots/mm)\n" 1197 " ic type: 0x%x\n" 1198 " info pattern: 0x%x\n", 1199 data->max_x, data->max_y, 1200 data->width_x, data->width_y, 1201 data->x_res, data->y_res, 1202 data->ic_type, data->pattern); 1203 1204 /* Set up input device properties based on queried parameters. */ 1205 error = elan_setup_input_device(data); 1206 if (error) 1207 return error; 1208 1209 if (device_property_read_bool(&client->dev, "elan,trackpoint")) { 1210 error = elan_setup_trackpoint_input_device(data); 1211 if (error) 1212 return error; 1213 } 1214 1215 /* 1216 * Platform code (ACPI, DTS) should normally set up interrupt 1217 * for us, but in case it did not let's fall back to using falling 1218 * edge to be compatible with older Chromebooks. 1219 */ 1220 irqflags = irq_get_trigger_type(client->irq); 1221 if (!irqflags) 1222 irqflags = IRQF_TRIGGER_FALLING; 1223 1224 error = devm_request_threaded_irq(dev, client->irq, NULL, elan_isr, 1225 irqflags | IRQF_ONESHOT, 1226 client->name, data); 1227 if (error) { 1228 dev_err(dev, "cannot register irq=%d\n", client->irq); 1229 return error; 1230 } 1231 1232 error = sysfs_create_groups(&dev->kobj, elan_sysfs_groups); 1233 if (error) { 1234 dev_err(dev, "failed to create sysfs attributes: %d\n", error); 1235 return error; 1236 } 1237 1238 error = devm_add_action(dev, elan_remove_sysfs_groups, data); 1239 if (error) { 1240 elan_remove_sysfs_groups(data); 1241 dev_err(dev, "Failed to add sysfs cleanup action: %d\n", 1242 error); 1243 return error; 1244 } 1245 1246 error = input_register_device(data->input); 1247 if (error) { 1248 dev_err(dev, "failed to register input device: %d\n", error); 1249 return error; 1250 } 1251 1252 if (data->tp_input) { 1253 error = input_register_device(data->tp_input); 1254 if (error) { 1255 dev_err(&client->dev, 1256 "failed to register TrackPoint input device: %d\n", 1257 error); 1258 return error; 1259 } 1260 } 1261 1262 /* 1263 * Systems using device tree should set up wakeup via DTS, 1264 * the rest will configure device as wakeup source by default. 1265 */ 1266 if (!dev->of_node) 1267 device_init_wakeup(dev, true); 1268 1269 return 0; 1270 } 1271 1272 static int __maybe_unused elan_suspend(struct device *dev) 1273 { 1274 struct i2c_client *client = to_i2c_client(dev); 1275 struct elan_tp_data *data = i2c_get_clientdata(client); 1276 int ret; 1277 1278 /* 1279 * We are taking the mutex to make sure sysfs operations are 1280 * complete before we attempt to bring the device into low[er] 1281 * power mode. 1282 */ 1283 ret = mutex_lock_interruptible(&data->sysfs_mutex); 1284 if (ret) 1285 return ret; 1286 1287 disable_irq(client->irq); 1288 1289 if (device_may_wakeup(dev)) { 1290 ret = elan_sleep(data); 1291 /* Enable wake from IRQ */ 1292 data->irq_wake = (enable_irq_wake(client->irq) == 0); 1293 } else { 1294 ret = elan_disable_power(data); 1295 } 1296 1297 mutex_unlock(&data->sysfs_mutex); 1298 return ret; 1299 } 1300 1301 static int __maybe_unused elan_resume(struct device *dev) 1302 { 1303 struct i2c_client *client = to_i2c_client(dev); 1304 struct elan_tp_data *data = i2c_get_clientdata(client); 1305 int error; 1306 1307 if (device_may_wakeup(dev) && data->irq_wake) { 1308 disable_irq_wake(client->irq); 1309 data->irq_wake = false; 1310 } 1311 1312 error = elan_enable_power(data); 1313 if (error) { 1314 dev_err(dev, "power up when resuming failed: %d\n", error); 1315 goto err; 1316 } 1317 1318 error = elan_initialize(data); 1319 if (error) 1320 dev_err(dev, "initialize when resuming failed: %d\n", error); 1321 1322 err: 1323 enable_irq(data->client->irq); 1324 return error; 1325 } 1326 1327 static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume); 1328 1329 static const struct i2c_device_id elan_id[] = { 1330 { DRIVER_NAME, 0 }, 1331 { }, 1332 }; 1333 MODULE_DEVICE_TABLE(i2c, elan_id); 1334 1335 #ifdef CONFIG_ACPI 1336 static const struct acpi_device_id elan_acpi_id[] = { 1337 { "ELAN0000", 0 }, 1338 { "ELAN0100", 0 }, 1339 { "ELAN0600", 0 }, 1340 { "ELAN0602", 0 }, 1341 { "ELAN0605", 0 }, 1342 { "ELAN0608", 0 }, 1343 { "ELAN0609", 0 }, 1344 { "ELAN060B", 0 }, 1345 { "ELAN060C", 0 }, 1346 { "ELAN0611", 0 }, 1347 { "ELAN0612", 0 }, 1348 { "ELAN0618", 0 }, 1349 { "ELAN1000", 0 }, 1350 { } 1351 }; 1352 MODULE_DEVICE_TABLE(acpi, elan_acpi_id); 1353 #endif 1354 1355 #ifdef CONFIG_OF 1356 static const struct of_device_id elan_of_match[] = { 1357 { .compatible = "elan,ekth3000" }, 1358 { /* sentinel */ } 1359 }; 1360 MODULE_DEVICE_TABLE(of, elan_of_match); 1361 #endif 1362 1363 static struct i2c_driver elan_driver = { 1364 .driver = { 1365 .name = DRIVER_NAME, 1366 .pm = &elan_pm_ops, 1367 .acpi_match_table = ACPI_PTR(elan_acpi_id), 1368 .of_match_table = of_match_ptr(elan_of_match), 1369 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1370 }, 1371 .probe = elan_probe, 1372 .id_table = elan_id, 1373 }; 1374 1375 module_i2c_driver(elan_driver); 1376 1377 MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>"); 1378 MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver"); 1379 MODULE_LICENSE("GPL"); 1380