drivers/input/mouse/elan_i2c_core.c

   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         { "ELAN0601", 0 },
1341         { "ELAN0602", 0 },
1342         { "ELAN0603", 0 },
1343         { "ELAN0604", 0 },
1344         { "ELAN0605", 0 },
1345         { "ELAN0606", 0 },
1346         { "ELAN0607", 0 },
1347         { "ELAN0608", 0 },
1348         { "ELAN0609", 0 },
1349         { "ELAN060B", 0 },
1350         { "ELAN060C", 0 },
1351         { "ELAN060F", 0 },
1352         { "ELAN0610", 0 },
1353         { "ELAN0611", 0 },
1354         { "ELAN0612", 0 },
1355         { "ELAN0615", 0 },
1356         { "ELAN0616", 0 },
1357         { "ELAN0617", 0 },
1358         { "ELAN0618", 0 },
1359         { "ELAN0619", 0 },
1360         { "ELAN061A", 0 },
1361         { "ELAN061B", 0 },
1362         { "ELAN061C", 0 },
1363         { "ELAN061D", 0 },
1364         { "ELAN061E", 0 },
1365         { "ELAN061F", 0 },
1366         { "ELAN0620", 0 },
1367         { "ELAN0621", 0 },
1368         { "ELAN0622", 0 },
1369         { "ELAN0623", 0 },
1370         { "ELAN0624", 0 },
1371         { "ELAN0625", 0 },
1372         { "ELAN0626", 0 },
1373         { "ELAN0627", 0 },
1374         { "ELAN0628", 0 },
1375         { "ELAN0629", 0 },
1376         { "ELAN062A", 0 },
1377         { "ELAN062B", 0 },
1378         { "ELAN062C", 0 },
1379         { "ELAN062D", 0 },
1380         { "ELAN0631", 0 },
1381         { "ELAN0632", 0 },
1382         { "ELAN1000", 0 },
1383         { }
1384 };
1385 MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
1386 #endif
1387
1388 #ifdef CONFIG_OF
1389 static const struct of_device_id elan_of_match[] = {
1390         { .compatible = "elan,ekth3000" },
1391         { /* sentinel */ }
1392 };
1393 MODULE_DEVICE_TABLE(of, elan_of_match);
1394 #endif
1395
1396 static struct i2c_driver elan_driver = {
1397         .driver = {
1398                 .name   = DRIVER_NAME,
1399                 .pm     = &elan_pm_ops,
1400                 .acpi_match_table = ACPI_PTR(elan_acpi_id),
1401                 .of_match_table = of_match_ptr(elan_of_match),
1402                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1403         },
1404         .probe          = elan_probe,
1405         .id_table       = elan_id,
1406 };
1407
1408 module_i2c_driver(elan_driver);
1409
1410 MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>");
1411 MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
1412 MODULE_LICENSE("GPL");