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