drivers/input/mouse/elan_i2c_core.c

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