linux/drivers/input/mouse/elan_i2c_core.c
<<
>>
Prefs
   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: \xE6\x9E\x97\xE6\x94\xBF\xE7\xB6\xAD (Duson Lin) <dusonlin@emc.com.tw>
   8 * Author: KT Liao <kt.liao@emc.com.tw>
   9 * Version: 1.6.3
  10 *
  11 * Based on cyapa driver:
  12 * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
  13 * copyright (c) 2011-2012 Google, Inc.
  14 *
  15 * Trademarks are the property of their respective owners.
  16 */
  17
  18#include <linux/acpi.h>
  19#include <linux/delay.h>
  20#include <linux/device.h>
  21#include <linux/firmware.h>
  22#include <linux/i2c.h>
  23#include <linux/init.h>
  24#include <linux/input/mt.h>
  25#include <linux/interrupt.h>
  26#include <linux/irq.h>
  27#include <linux/module.h>
  28#include <linux/slab.h>
  29#include <linux/kernel.h>
  30#include <linux/sched.h>
  31#include <linux/input.h>
  32#include <linux/uaccess.h>
  33#include <linux/jiffies.h>
  34#include <linux/completion.h>
  35#include <linux/of.h>
  36#include <linux/property.h>
  37#include <linux/regulator/consumer.h>
  38#include <asm/unaligned.h>
  39
  40#include "elan_i2c.h"
  41
  42#define DRIVER_NAME             "elan_i2c"
  43#define ELAN_VENDOR_ID          0x04f3
  44#define ETP_MAX_PRESSURE        255
  45#define ETP_FWIDTH_REDUCE       90
  46#define ETP_FINGER_WIDTH        15
  47#define ETP_RETRY_COUNT         3
  48
  49/* quirks to control the device */
  50#define ETP_QUIRK_QUICK_WAKEUP  BIT(0)
  51
  52/* The main device structure */
  53struct elan_tp_data {
  54        struct i2c_client       *client;
  55        struct input_dev        *input;
  56        struct input_dev        *tp_input; /* trackpoint input node */
  57        struct regulator        *vcc;
  58
  59        const struct elan_transport_ops *ops;
  60
  61        /* for fw update */
  62        struct completion       fw_completion;
  63        bool                    in_fw_update;
  64
  65        struct mutex            sysfs_mutex;
  66
  67        unsigned int            max_x;
  68        unsigned int            max_y;
  69        unsigned int            width_x;
  70        unsigned int            width_y;
  71        unsigned int            x_res;
  72        unsigned int            y_res;
  73
  74        u8                      pattern;
  75        u16                     product_id;
  76        u8                      fw_version;
  77        u8                      sm_version;
  78        u8                      iap_version;
  79        u16                     fw_checksum;
  80        unsigned int            report_features;
  81        unsigned int            report_len;
  82        int                     pressure_adjustment;
  83        u8                      mode;
  84        u16                     ic_type;
  85        u16                     fw_validpage_count;
  86        u16                     fw_page_size;
  87        u32                     fw_signature_address;
  88
  89        bool                    irq_wake;
  90
  91        u8                      min_baseline;
  92        u8                      max_baseline;
  93        bool                    baseline_ready;
  94        u8                      clickpad;
  95        bool                    middle_button;
  96
  97        u32                     quirks;         /* Various quirks */
  98};
  99
 100static u32 elan_i2c_lookup_quirks(u16 ic_type, u16 product_id)
 101{
 102        static const struct {
 103                u16 ic_type;
 104                u16 product_id;
 105                u32 quirks;
 106        } elan_i2c_quirks[] = {
 107                { 0x0D, ETP_PRODUCT_ID_DELBIN, ETP_QUIRK_QUICK_WAKEUP },
 108                { 0x10, ETP_PRODUCT_ID_VOXEL, ETP_QUIRK_QUICK_WAKEUP },
 109                { 0x14, ETP_PRODUCT_ID_MAGPIE, ETP_QUIRK_QUICK_WAKEUP },
 110                { 0x14, ETP_PRODUCT_ID_BOBBA, ETP_QUIRK_QUICK_WAKEUP },
 111        };
 112        u32 quirks = 0;
 113        int i;
 114
 115        for (i = 0; i < ARRAY_SIZE(elan_i2c_quirks); i++) {
 116                if (elan_i2c_quirks[i].ic_type == ic_type &&
 117                    elan_i2c_quirks[i].product_id == product_id) {
 118                        quirks = elan_i2c_quirks[i].quirks;
 119                }
 120        }
 121
 122        if (ic_type >= 0x0D && product_id >= 0x123)
 123                quirks |= ETP_QUIRK_QUICK_WAKEUP;
 124
 125        return quirks;
 126}
 127
 128static int elan_get_fwinfo(u16 ic_type, u8 iap_version, u16 *validpage_count,
 129                           u32 *signature_address, u16 *page_size)
 130{
 131        switch (ic_type) {
 132        case 0x00:
 133        case 0x06:
 134        case 0x08:
 135                *validpage_count = 512;
 136                break;
 137        case 0x03:
 138        case 0x07:
 139        case 0x09:
 140        case 0x0A:
 141        case 0x0B:
 142        case 0x0C:
 143                *validpage_count = 768;
 144                break;
 145        case 0x0D:
 146                *validpage_count = 896;
 147                break;
 148        case 0x0E:
 149                *validpage_count = 640;
 150                break;
 151        case 0x10:
 152                *validpage_count = 1024;
 153                break;
 154        case 0x11:
 155                *validpage_count = 1280;
 156                break;
 157        case 0x13:
 158                *validpage_count = 2048;
 159                break;
 160        case 0x14:
 161        case 0x15:
 162                *validpage_count = 1024;
 163                break;
 164        default:
 165                /* unknown ic type clear value */
 166                *validpage_count = 0;
 167                *signature_address = 0;
 168                *page_size = 0;
 169                return -ENXIO;
 170        }
 171
 172        *signature_address =
 173                (*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE;
 174
 175        if ((ic_type == 0x14 || ic_type == 0x15) && iap_version >= 2) {
 176                *validpage_count /= 8;
 177                *page_size = ETP_FW_PAGE_SIZE_512;
 178        } else if (ic_type >= 0x0D && iap_version >= 1) {
 179                *validpage_count /= 2;
 180                *page_size = ETP_FW_PAGE_SIZE_128;
 181        } else {
 182                *page_size = ETP_FW_PAGE_SIZE;
 183        }
 184
 185        return 0;
 186}
 187
 188static int elan_enable_power(struct elan_tp_data *data)
 189{
 190        int repeat = ETP_RETRY_COUNT;
 191        int error;
 192
 193        error = regulator_enable(data->vcc);
 194        if (error) {
 195                dev_err(&data->client->dev,
 196                        "failed to enable regulator: %d\n", error);
 197                return error;
 198        }
 199
 200        do {
 201                error = data->ops->power_control(data->client, true);
 202                if (error >= 0)
 203                        return 0;
 204
 205                msleep(30);
 206        } while (--repeat > 0);
 207
 208        dev_err(&data->client->dev, "failed to enable power: %d\n", error);
 209        return error;
 210}
 211
 212static int elan_disable_power(struct elan_tp_data *data)
 213{
 214        int repeat = ETP_RETRY_COUNT;
 215        int error;
 216
 217        do {
 218                error = data->ops->power_control(data->client, false);
 219                if (!error) {
 220                        error = regulator_disable(data->vcc);
 221                        if (error) {
 222                                dev_err(&data->client->dev,
 223                                        "failed to disable regulator: %d\n",
 224                                        error);
 225                                /* Attempt to power the chip back up */
 226                                data->ops->power_control(data->client, true);
 227                                break;
 228                        }
 229
 230                        return 0;
 231                }
 232
 233                msleep(30);
 234        } while (--repeat > 0);
 235
 236        dev_err(&data->client->dev, "failed to disable power: %d\n", error);
 237        return error;
 238}
 239
 240static int elan_sleep(struct elan_tp_data *data)
 241{
 242        int repeat = ETP_RETRY_COUNT;
 243        int error;
 244
 245        do {
 246                error = data->ops->sleep_control(data->client, true);
 247                if (!error)
 248                        return 0;
 249
 250                msleep(30);
 251        } while (--repeat > 0);
 252
 253        return error;
 254}
 255
 256static int elan_query_product(struct elan_tp_data *data)
 257{
 258        int error;
 259
 260        error = data->ops->get_product_id(data->client, &data->product_id);
 261        if (error)
 262                return error;
 263
 264        error = data->ops->get_pattern(data->client, &data->pattern);
 265        if (error)
 266                return error;
 267
 268        error = data->ops->get_sm_version(data->client, data->pattern,
 269                                          &data->ic_type, &data->sm_version,
 270                                          &data->clickpad);
 271        if (error)
 272                return error;
 273
 274        return 0;
 275}
 276
 277static int elan_check_ASUS_special_fw(struct elan_tp_data *data)
 278{
 279        if (data->ic_type == 0x0E) {
 280                switch (data->product_id) {
 281                case 0x05 ... 0x07:
 282                case 0x09:
 283                case 0x13:
 284                        return true;
 285                }
 286        } else if (data->ic_type == 0x08 && data->product_id == 0x26) {
 287                /* ASUS EeeBook X205TA */
 288                return true;
 289        }
 290
 291        return false;
 292}
 293
 294static int __elan_initialize(struct elan_tp_data *data, bool skip_reset)
 295{
 296        struct i2c_client *client = data->client;
 297        bool woken_up = false;
 298        int error;
 299
 300        if (!skip_reset) {
 301                error = data->ops->initialize(client);
 302                if (error) {
 303                        dev_err(&client->dev, "device initialize failed: %d\n", error);
 304                        return error;
 305                }
 306        }
 307
 308        error = elan_query_product(data);
 309        if (error)
 310                return error;
 311
 312        /*
 313         * Some ASUS devices were shipped with firmware that requires
 314         * touchpads to be woken up first, before attempting to switch
 315         * them into absolute reporting mode.
 316         */
 317        if (elan_check_ASUS_special_fw(data)) {
 318                error = data->ops->sleep_control(client, false);
 319                if (error) {
 320                        dev_err(&client->dev,
 321                                "failed to wake device up: %d\n", error);
 322                        return error;
 323                }
 324
 325                msleep(200);
 326                woken_up = true;
 327        }
 328
 329        data->mode |= ETP_ENABLE_ABS;
 330        error = data->ops->set_mode(client, data->mode);
 331        if (error) {
 332                dev_err(&client->dev,
 333                        "failed to switch to absolute mode: %d\n", error);
 334                return error;
 335        }
 336
 337        if (!woken_up) {
 338                error = data->ops->sleep_control(client, false);
 339                if (error) {
 340                        dev_err(&client->dev,
 341                                "failed to wake device up: %d\n", error);
 342                        return error;
 343                }
 344        }
 345
 346        return 0;
 347}
 348
 349static int elan_initialize(struct elan_tp_data *data, bool skip_reset)
 350{
 351        int repeat = ETP_RETRY_COUNT;
 352        int error;
 353
 354        do {
 355                error = __elan_initialize(data, skip_reset);
 356                if (!error)
 357                        return 0;
 358
 359                skip_reset = false;
 360                msleep(30);
 361        } while (--repeat > 0);
 362
 363        return error;
 364}
 365
 366static int elan_query_device_info(struct elan_tp_data *data)
 367{
 368        int error;
 369
 370        error = data->ops->get_version(data->client, data->pattern, false,
 371                                       &data->fw_version);
 372        if (error)
 373                return error;
 374
 375        error = data->ops->get_checksum(data->client, false,
 376                                        &data->fw_checksum);
 377        if (error)
 378                return error;
 379
 380        error = data->ops->get_version(data->client, data->pattern,
 381                                       true, &data->iap_version);
 382        if (error)
 383                return error;
 384
 385        error = data->ops->get_pressure_adjustment(data->client,
 386                                                   &data->pressure_adjustment);
 387        if (error)
 388                return error;
 389
 390        error = data->ops->get_report_features(data->client, data->pattern,
 391                                               &data->report_features,
 392                                               &data->report_len);
 393        if (error)
 394                return error;
 395
 396        data->quirks = elan_i2c_lookup_quirks(data->ic_type, data->product_id);
 397
 398        error = elan_get_fwinfo(data->ic_type, data->iap_version,
 399                                &data->fw_validpage_count,
 400                                &data->fw_signature_address,
 401                                &data->fw_page_size);
 402        if (error)
 403                dev_warn(&data->client->dev,
 404                         "unexpected iap version %#04x (ic type: %#04x), firmware update will not work\n",
 405                         data->iap_version, data->ic_type);
 406
 407        return 0;
 408}
 409
 410static unsigned int elan_convert_resolution(u8 val, u8 pattern)
 411{
 412        /*
 413         * pattern <= 0x01:
 414         *      (value from firmware) * 10 + 790 = dpi
 415         * else
 416         *      ((value from firmware) + 3) * 100 = dpi
 417         */
 418        int res = pattern <= 0x01 ?
 419                (int)(char)val * 10 + 790 : ((int)(char)val + 3) * 100;
 420        /*
 421         * We also have to convert dpi to dots/mm (*10/254 to avoid floating
 422         * point).
 423         */
 424        return res * 10 / 254;
 425}
 426
 427static int elan_query_device_parameters(struct elan_tp_data *data)
 428{
 429        struct i2c_client *client = data->client;
 430        unsigned int x_traces, y_traces;
 431        u32 x_mm, y_mm;
 432        u8 hw_x_res, hw_y_res;
 433        int error;
 434
 435        if (device_property_read_u32(&client->dev,
 436                                     "touchscreen-size-x", &data->max_x) ||
 437            device_property_read_u32(&client->dev,
 438                                     "touchscreen-size-y", &data->max_y)) {
 439                error = data->ops->get_max(data->client,
 440                                           &data->max_x,
 441                                           &data->max_y);
 442                if (error)
 443                        return error;
 444        } else {
 445                /* size is the maximum + 1 */
 446                --data->max_x;
 447                --data->max_y;
 448        }
 449
 450        if (device_property_read_u32(&client->dev,
 451                                     "elan,x_traces",
 452                                     &x_traces) ||
 453            device_property_read_u32(&client->dev,
 454                                     "elan,y_traces",
 455                                     &y_traces)) {
 456                error = data->ops->get_num_traces(data->client,
 457                                                  &x_traces, &y_traces);
 458                if (error)
 459                        return error;
 460        }
 461        data->width_x = data->max_x / x_traces;
 462        data->width_y = data->max_y / y_traces;
 463
 464        if (device_property_read_u32(&client->dev,
 465                                     "touchscreen-x-mm", &x_mm) ||
 466            device_property_read_u32(&client->dev,
 467                                     "touchscreen-y-mm", &y_mm)) {
 468                error = data->ops->get_resolution(data->client,
 469                                                  &hw_x_res, &hw_y_res);
 470                if (error)
 471                        return error;
 472
 473                data->x_res = elan_convert_resolution(hw_x_res, data->pattern);
 474                data->y_res = elan_convert_resolution(hw_y_res, data->pattern);
 475        } else {
 476                data->x_res = (data->max_x + 1) / x_mm;
 477                data->y_res = (data->max_y + 1) / y_mm;
 478        }
 479
 480        if (device_property_read_bool(&client->dev, "elan,clickpad"))
 481                data->clickpad = 1;
 482
 483        if (device_property_read_bool(&client->dev, "elan,middle-button"))
 484                data->middle_button = true;
 485
 486        return 0;
 487}
 488
 489/*
 490 **********************************************************
 491 * IAP firmware updater related routines
 492 **********************************************************
 493 */
 494static int elan_write_fw_block(struct elan_tp_data *data, u16 page_size,
 495                               const u8 *page, u16 checksum, int idx)
 496{
 497        int retry = ETP_RETRY_COUNT;
 498        int error;
 499
 500        do {
 501                error = data->ops->write_fw_block(data->client, page_size,
 502                                                  page, checksum, idx);
 503                if (!error)
 504                        return 0;
 505
 506                dev_dbg(&data->client->dev,
 507                        "IAP retrying page %d (error: %d)\n", idx, error);
 508        } while (--retry > 0);
 509
 510        return error;
 511}
 512
 513static int __elan_update_firmware(struct elan_tp_data *data,
 514                                  const struct firmware *fw)
 515{
 516        struct i2c_client *client = data->client;
 517        struct device *dev = &client->dev;
 518        int i, j;
 519        int error;
 520        u16 iap_start_addr;
 521        u16 boot_page_count;
 522        u16 sw_checksum = 0, fw_checksum = 0;
 523
 524        error = data->ops->prepare_fw_update(client, data->ic_type,
 525                                             data->iap_version,
 526                                             data->fw_page_size);
 527        if (error)
 528                return error;
 529
 530        iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]);
 531
 532        boot_page_count = (iap_start_addr * 2) / data->fw_page_size;
 533        for (i = boot_page_count; i < data->fw_validpage_count; i++) {
 534                u16 checksum = 0;
 535                const u8 *page = &fw->data[i * data->fw_page_size];
 536
 537                for (j = 0; j < data->fw_page_size; j += 2)
 538                        checksum += ((page[j + 1] << 8) | page[j]);
 539
 540                error = elan_write_fw_block(data, data->fw_page_size,
 541                                            page, checksum, i);
 542                if (error) {
 543                        dev_err(dev, "write page %d fail: %d\n", i, error);
 544                        return error;
 545                }
 546
 547                sw_checksum += checksum;
 548        }
 549
 550        /* Wait WDT reset and power on reset */
 551        msleep(600);
 552
 553        error = data->ops->finish_fw_update(client, &data->fw_completion);
 554        if (error)
 555                return error;
 556
 557        error = data->ops->get_checksum(client, true, &fw_checksum);
 558        if (error)
 559                return error;
 560
 561        if (sw_checksum != fw_checksum) {
 562                dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
 563                        sw_checksum, fw_checksum);
 564                return -EIO;
 565        }
 566
 567        return 0;
 568}
 569
 570static int elan_update_firmware(struct elan_tp_data *data,
 571                                const struct firmware *fw)
 572{
 573        struct i2c_client *client = data->client;
 574        int retval;
 575
 576        dev_dbg(&client->dev, "Starting firmware update....\n");
 577
 578        disable_irq(client->irq);
 579        data->in_fw_update = true;
 580
 581        retval = __elan_update_firmware(data, fw);
 582        if (retval) {
 583                dev_err(&client->dev, "firmware update failed: %d\n", retval);
 584                data->ops->iap_reset(client);
 585        } else {
 586                /* Reinitialize TP after fw is updated */
 587                elan_initialize(data, false);
 588                elan_query_device_info(data);
 589        }
 590
 591        data->in_fw_update = false;
 592        enable_irq(client->irq);
 593
 594        return retval;
 595}
 596
 597/*
 598 *******************************************************************
 599 * SYSFS attributes
 600 *******************************************************************
 601 */
 602static ssize_t elan_sysfs_read_fw_checksum(struct device *dev,
 603                                           struct device_attribute *attr,
 604                                           char *buf)
 605{
 606        struct i2c_client *client = to_i2c_client(dev);
 607        struct elan_tp_data *data = i2c_get_clientdata(client);
 608
 609        return sprintf(buf, "0x%04x\n", data->fw_checksum);
 610}
 611
 612static ssize_t elan_sysfs_read_product_id(struct device *dev,
 613                                         struct device_attribute *attr,
 614                                         char *buf)
 615{
 616        struct i2c_client *client = to_i2c_client(dev);
 617        struct elan_tp_data *data = i2c_get_clientdata(client);
 618
 619        return sprintf(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n",
 620                       data->product_id);
 621}
 622
 623static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
 624                                      struct device_attribute *attr,
 625                                      char *buf)
 626{
 627        struct i2c_client *client = to_i2c_client(dev);
 628        struct elan_tp_data *data = i2c_get_clientdata(client);
 629
 630        return sprintf(buf, "%d.0\n", data->fw_version);
 631}
 632
 633static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
 634                                      struct device_attribute *attr,
 635                                      char *buf)
 636{
 637        struct i2c_client *client = to_i2c_client(dev);
 638        struct elan_tp_data *data = i2c_get_clientdata(client);
 639
 640        return sprintf(buf, "%d.0\n", data->sm_version);
 641}
 642
 643static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
 644                                       struct device_attribute *attr,
 645                                       char *buf)
 646{
 647        struct i2c_client *client = to_i2c_client(dev);
 648        struct elan_tp_data *data = i2c_get_clientdata(client);
 649
 650        return sprintf(buf, "%d.0\n", data->iap_version);
 651}
 652
 653static ssize_t elan_sysfs_update_fw(struct device *dev,
 654                                    struct device_attribute *attr,
 655                                    const char *buf, size_t count)
 656{
 657        struct elan_tp_data *data = dev_get_drvdata(dev);
 658        const struct firmware *fw;
 659        char *fw_name;
 660        int error;
 661        const u8 *fw_signature;
 662        static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
 663
 664        if (data->fw_validpage_count == 0)
 665                return -EINVAL;
 666
 667        /* Look for a firmware with the product id appended. */
 668        fw_name = kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id);
 669        if (!fw_name) {
 670                dev_err(dev, "failed to allocate memory for firmware name\n");
 671                return -ENOMEM;
 672        }
 673
 674        dev_info(dev, "requesting fw '%s'\n", fw_name);
 675        error = request_firmware(&fw, fw_name, dev);
 676        kfree(fw_name);
 677        if (error) {
 678                dev_err(dev, "failed to request firmware: %d\n", error);
 679                return error;
 680        }
 681
 682        /* Firmware file must match signature data */
 683        fw_signature = &fw->data[data->fw_signature_address];
 684        if (memcmp(fw_signature, signature, sizeof(signature)) != 0) {
 685                dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n",
 686                        (int)sizeof(signature), signature,
 687                        (int)sizeof(signature), fw_signature);
 688                error = -EBADF;
 689                goto out_release_fw;
 690        }
 691
 692        error = mutex_lock_interruptible(&data->sysfs_mutex);
 693        if (error)
 694                goto out_release_fw;
 695
 696        error = elan_update_firmware(data, fw);
 697
 698        mutex_unlock(&data->sysfs_mutex);
 699
 700out_release_fw:
 701        release_firmware(fw);
 702        return error ?: count;
 703}
 704
 705static ssize_t calibrate_store(struct device *dev,
 706                               struct device_attribute *attr,
 707                               const char *buf, size_t count)
 708{
 709        struct i2c_client *client = to_i2c_client(dev);
 710        struct elan_tp_data *data = i2c_get_clientdata(client);
 711        int tries = 20;
 712        int retval;
 713        int error;
 714        u8 val[ETP_CALIBRATE_MAX_LEN];
 715
 716        retval = mutex_lock_interruptible(&data->sysfs_mutex);
 717        if (retval)
 718                return retval;
 719
 720        disable_irq(client->irq);
 721
 722        data->mode |= ETP_ENABLE_CALIBRATE;
 723        retval = data->ops->set_mode(client, data->mode);
 724        if (retval) {
 725                dev_err(dev, "failed to enable calibration mode: %d\n",
 726                        retval);
 727                goto out;
 728        }
 729
 730        retval = data->ops->calibrate(client);
 731        if (retval) {
 732                dev_err(dev, "failed to start calibration: %d\n",
 733                        retval);
 734                goto out_disable_calibrate;
 735        }
 736
 737        val[0] = 0xff;
 738        do {
 739                /* Wait 250ms before checking if calibration has completed. */
 740                msleep(250);
 741
 742                retval = data->ops->calibrate_result(client, val);
 743                if (retval)
 744                        dev_err(dev, "failed to check calibration result: %d\n",
 745                                retval);
 746                else if (val[0] == 0)
 747                        break; /* calibration done */
 748
 749        } while (--tries);
 750
 751        if (tries == 0) {
 752                dev_err(dev, "failed to calibrate. Timeout.\n");
 753                retval = -ETIMEDOUT;
 754        }
 755
 756out_disable_calibrate:
 757        data->mode &= ~ETP_ENABLE_CALIBRATE;
 758        error = data->ops->set_mode(data->client, data->mode);
 759        if (error) {
 760                dev_err(dev, "failed to disable calibration mode: %d\n",
 761                        error);
 762                if (!retval)
 763                        retval = error;
 764        }
 765out:
 766        enable_irq(client->irq);
 767        mutex_unlock(&data->sysfs_mutex);
 768        return retval ?: count;
 769}
 770
 771static ssize_t elan_sysfs_read_mode(struct device *dev,
 772                                    struct device_attribute *attr,
 773                                    char *buf)
 774{
 775        struct i2c_client *client = to_i2c_client(dev);
 776        struct elan_tp_data *data = i2c_get_clientdata(client);
 777        int error;
 778        enum tp_mode mode;
 779
 780        error = mutex_lock_interruptible(&data->sysfs_mutex);
 781        if (error)
 782                return error;
 783
 784        error = data->ops->iap_get_mode(data->client, &mode);
 785
 786        mutex_unlock(&data->sysfs_mutex);
 787
 788        if (error)
 789                return error;
 790
 791        return sprintf(buf, "%d\n", (int)mode);
 792}
 793
 794static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL);
 795static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
 796static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
 797static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
 798static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
 799static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL);
 800static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
 801
 802static DEVICE_ATTR_WO(calibrate);
 803
 804static struct attribute *elan_sysfs_entries[] = {
 805        &dev_attr_product_id.attr,
 806        &dev_attr_firmware_version.attr,
 807        &dev_attr_sample_version.attr,
 808        &dev_attr_iap_version.attr,
 809        &dev_attr_fw_checksum.attr,
 810        &dev_attr_calibrate.attr,
 811        &dev_attr_mode.attr,
 812        &dev_attr_update_fw.attr,
 813        NULL,
 814};
 815
 816static const struct attribute_group elan_sysfs_group = {
 817        .attrs = elan_sysfs_entries,
 818};
 819
 820static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
 821                             const char *buf, size_t count)
 822{
 823        struct i2c_client *client = to_i2c_client(dev);
 824        struct elan_tp_data *data = i2c_get_clientdata(client);
 825        int error;
 826        int retval;
 827
 828        retval = mutex_lock_interruptible(&data->sysfs_mutex);
 829        if (retval)
 830                return retval;
 831
 832        disable_irq(client->irq);
 833
 834        data->baseline_ready = false;
 835
 836        data->mode |= ETP_ENABLE_CALIBRATE;
 837        retval = data->ops->set_mode(data->client, data->mode);
 838        if (retval) {
 839                dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
 840                        retval);
 841                goto out;
 842        }
 843
 844        msleep(250);
 845
 846        retval = data->ops->get_baseline_data(data->client, true,
 847                                              &data->max_baseline);
 848        if (retval) {
 849                dev_err(dev, "Failed to read max baseline form device: %d\n",
 850                        retval);
 851                goto out_disable_calibrate;
 852        }
 853
 854        retval = data->ops->get_baseline_data(data->client, false,
 855                                              &data->min_baseline);
 856        if (retval) {
 857                dev_err(dev, "Failed to read min baseline form device: %d\n",
 858                        retval);
 859                goto out_disable_calibrate;
 860        }
 861
 862        data->baseline_ready = true;
 863
 864out_disable_calibrate:
 865        data->mode &= ~ETP_ENABLE_CALIBRATE;
 866        error = data->ops->set_mode(data->client, data->mode);
 867        if (error) {
 868                dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
 869                        error);
 870                if (!retval)
 871                        retval = error;
 872        }
 873out:
 874        enable_irq(client->irq);
 875        mutex_unlock(&data->sysfs_mutex);
 876        return retval ?: count;
 877}
 878
 879static ssize_t min_show(struct device *dev,
 880                        struct device_attribute *attr, char *buf)
 881{
 882        struct i2c_client *client = to_i2c_client(dev);
 883        struct elan_tp_data *data = i2c_get_clientdata(client);
 884        int retval;
 885
 886        retval = mutex_lock_interruptible(&data->sysfs_mutex);
 887        if (retval)
 888                return retval;
 889
 890        if (!data->baseline_ready) {
 891                retval = -ENODATA;
 892                goto out;
 893        }
 894
 895        retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline);
 896
 897out:
 898        mutex_unlock(&data->sysfs_mutex);
 899        return retval;
 900}
 901
 902static ssize_t max_show(struct device *dev,
 903                        struct device_attribute *attr, char *buf)
 904{
 905        struct i2c_client *client = to_i2c_client(dev);
 906        struct elan_tp_data *data = i2c_get_clientdata(client);
 907        int retval;
 908
 909        retval = mutex_lock_interruptible(&data->sysfs_mutex);
 910        if (retval)
 911                return retval;
 912
 913        if (!data->baseline_ready) {
 914                retval = -ENODATA;
 915                goto out;
 916        }
 917
 918        retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline);
 919
 920out:
 921        mutex_unlock(&data->sysfs_mutex);
 922        return retval;
 923}
 924
 925
 926static DEVICE_ATTR_WO(acquire);
 927static DEVICE_ATTR_RO(min);
 928static DEVICE_ATTR_RO(max);
 929
 930static struct attribute *elan_baseline_sysfs_entries[] = {
 931        &dev_attr_acquire.attr,
 932        &dev_attr_min.attr,
 933        &dev_attr_max.attr,
 934        NULL,
 935};
 936
 937static const struct attribute_group elan_baseline_sysfs_group = {
 938        .name = "baseline",
 939        .attrs = elan_baseline_sysfs_entries,
 940};
 941
 942static const struct attribute_group *elan_sysfs_groups[] = {
 943        &elan_sysfs_group,
 944        &elan_baseline_sysfs_group,
 945        NULL
 946};
 947
 948/*
 949 ******************************************************************
 950 * Elan isr functions
 951 ******************************************************************
 952 */
 953static void elan_report_contact(struct elan_tp_data *data, int contact_num,
 954                                bool contact_valid, bool high_precision,
 955                                u8 *packet, u8 *finger_data)
 956{
 957        struct input_dev *input = data->input;
 958        unsigned int pos_x, pos_y;
 959        unsigned int pressure, scaled_pressure;
 960
 961        if (contact_valid) {
 962                if (high_precision) {
 963                        pos_x = get_unaligned_be16(&finger_data[0]);
 964                        pos_y = get_unaligned_be16(&finger_data[2]);
 965                } else {
 966                        pos_x = ((finger_data[0] & 0xf0) << 4) | finger_data[1];
 967                        pos_y = ((finger_data[0] & 0x0f) << 8) | finger_data[2];
 968                }
 969
 970                if (pos_x > data->max_x || pos_y > data->max_y) {
 971                        dev_dbg(input->dev.parent,
 972                                "[%d] x=%d y=%d over max (%d, %d)",
 973                                contact_num, pos_x, pos_y,
 974                                data->max_x, data->max_y);
 975                        return;
 976                }
 977
 978                pressure = finger_data[4];
 979                scaled_pressure = pressure + data->pressure_adjustment;
 980                if (scaled_pressure > ETP_MAX_PRESSURE)
 981                        scaled_pressure = ETP_MAX_PRESSURE;
 982
 983                input_mt_slot(input, contact_num);
 984                input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
 985                input_report_abs(input, ABS_MT_POSITION_X, pos_x);
 986                input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y);
 987                input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure);
 988
 989                if (data->report_features & ETP_FEATURE_REPORT_MK) {
 990                        unsigned int mk_x, mk_y, area_x, area_y;
 991                        u8 mk_data = high_precision ?
 992                                packet[ETP_MK_DATA_OFFSET + contact_num] :
 993                                finger_data[3];
 994
 995                        mk_x = mk_data & 0x0f;
 996                        mk_y = mk_data >> 4;
 997
 998                        /*
 999                         * To avoid treating large finger as palm, let's reduce
1000                         * the width x and y per trace.
1001                         */
1002                        area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
1003                        area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
1004
1005                        input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
1006                        input_report_abs(input, ABS_MT_TOUCH_MAJOR,
1007                                         max(area_x, area_y));
1008                        input_report_abs(input, ABS_MT_TOUCH_MINOR,
1009                                         min(area_x, area_y));
1010                }
1011        } else {
1012                input_mt_slot(input, contact_num);
1013                input_mt_report_slot_inactive(input);
1014        }
1015}
1016
1017static void elan_report_absolute(struct elan_tp_data *data, u8 *packet,
1018                                 bool high_precision)
1019{
1020        struct input_dev *input = data->input;
1021        u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
1022        int i;
1023        u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
1024        u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
1025        bool contact_valid, hover_event;
1026
1027        pm_wakeup_event(&data->client->dev, 0);
1028
1029        hover_event = hover_info & BIT(6);
1030
1031        for (i = 0; i < ETP_MAX_FINGERS; i++) {
1032                contact_valid = tp_info & BIT(3 + i);
1033                elan_report_contact(data, i, contact_valid, high_precision,
1034                                    packet, finger_data);
1035                if (contact_valid)
1036                        finger_data += ETP_FINGER_DATA_LEN;
1037        }
1038
1039        input_report_key(input, BTN_LEFT,   tp_info & BIT(0));
1040        input_report_key(input, BTN_MIDDLE, tp_info & BIT(2));
1041        input_report_key(input, BTN_RIGHT,  tp_info & BIT(1));
1042        input_report_abs(input, ABS_DISTANCE, hover_event != 0);
1043        input_mt_report_pointer_emulation(input, true);
1044        input_sync(input);
1045}
1046
1047static void elan_report_trackpoint(struct elan_tp_data *data, u8 *report)
1048{
1049        struct input_dev *input = data->tp_input;
1050        u8 *packet = &report[ETP_REPORT_ID_OFFSET + 1];
1051        int x, y;
1052
1053        pm_wakeup_event(&data->client->dev, 0);
1054
1055        if (!data->tp_input) {
1056                dev_warn_once(&data->client->dev,
1057                              "received a trackpoint report while no trackpoint device has been created. Please report upstream.\n");
1058                return;
1059        }
1060
1061        input_report_key(input, BTN_LEFT, packet[0] & 0x01);
1062        input_report_key(input, BTN_RIGHT, packet[0] & 0x02);
1063        input_report_key(input, BTN_MIDDLE, packet[0] & 0x04);
1064
1065        if ((packet[3] & 0x0F) == 0x06) {
1066                x = packet[4] - (int)((packet[1] ^ 0x80) << 1);
1067                y = (int)((packet[2] ^ 0x80) << 1) - packet[5];
1068
1069                input_report_rel(input, REL_X, x);
1070                input_report_rel(input, REL_Y, y);
1071        }
1072
1073        input_sync(input);
1074}
1075
1076static irqreturn_t elan_isr(int irq, void *dev_id)
1077{
1078        struct elan_tp_data *data = dev_id;
1079        int error;
1080        u8 report[ETP_MAX_REPORT_LEN];
1081
1082        /*
1083         * When device is connected to i2c bus, when all IAP page writes
1084         * complete, the driver will receive interrupt and must read
1085         * 0000 to confirm that IAP is finished.
1086        */
1087        if (data->in_fw_update) {
1088                complete(&data->fw_completion);
1089                goto out;
1090        }
1091
1092        error = data->ops->get_report(data->client, report, data->report_len);
1093        if (error)
1094                goto out;
1095
1096        switch (report[ETP_REPORT_ID_OFFSET]) {
1097        case ETP_REPORT_ID:
1098                elan_report_absolute(data, report, false);
1099                break;
1100        case ETP_REPORT_ID2:
1101                elan_report_absolute(data, report, true);
1102                break;
1103        case ETP_TP_REPORT_ID:
1104        case ETP_TP_REPORT_ID2:
1105                elan_report_trackpoint(data, report);
1106                break;
1107        default:
1108                dev_err(&data->client->dev, "invalid report id data (%x)\n",
1109                        report[ETP_REPORT_ID_OFFSET]);
1110        }
1111
1112out:
1113        return IRQ_HANDLED;
1114}
1115
1116/*
1117 ******************************************************************
1118 * Elan initialization functions
1119 ******************************************************************
1120 */
1121
1122static int elan_setup_trackpoint_input_device(struct elan_tp_data *data)
1123{
1124        struct device *dev = &data->client->dev;
1125        struct input_dev *input;
1126
1127        input = devm_input_allocate_device(dev);
1128        if (!input)
1129                return -ENOMEM;
1130
1131        input->name = "Elan TrackPoint";
1132        input->id.bustype = BUS_I2C;
1133        input->id.vendor = ELAN_VENDOR_ID;
1134        input->id.product = data->product_id;
1135        input_set_drvdata(input, data);
1136
1137        input_set_capability(input, EV_REL, REL_X);
1138        input_set_capability(input, EV_REL, REL_Y);
1139        input_set_capability(input, EV_KEY, BTN_LEFT);
1140        input_set_capability(input, EV_KEY, BTN_RIGHT);
1141        input_set_capability(input, EV_KEY, BTN_MIDDLE);
1142
1143        __set_bit(INPUT_PROP_POINTER, input->propbit);
1144        __set_bit(INPUT_PROP_POINTING_STICK, input->propbit);
1145
1146        data->tp_input = input;
1147
1148        return 0;
1149}
1150
1151static int elan_setup_input_device(struct elan_tp_data *data)
1152{
1153        struct device *dev = &data->client->dev;
1154        struct input_dev *input;
1155        unsigned int max_width = max(data->width_x, data->width_y);
1156        unsigned int min_width = min(data->width_x, data->width_y);
1157        int error;
1158
1159        input = devm_input_allocate_device(dev);
1160        if (!input)
1161                return -ENOMEM;
1162
1163        input->name = "Elan Touchpad";
1164        input->id.bustype = BUS_I2C;
1165        input->id.vendor = ELAN_VENDOR_ID;
1166        input->id.product = data->product_id;
1167        input_set_drvdata(input, data);
1168
1169        error = input_mt_init_slots(input, ETP_MAX_FINGERS,
1170                                    INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
1171        if (error) {
1172                dev_err(dev, "failed to initialize MT slots: %d\n", error);
1173                return error;
1174        }
1175
1176        __set_bit(EV_ABS, input->evbit);
1177        __set_bit(INPUT_PROP_POINTER, input->propbit);
1178        if (data->clickpad) {
1179                __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
1180        } else {
1181                __set_bit(BTN_RIGHT, input->keybit);
1182                if (data->middle_button)
1183                        __set_bit(BTN_MIDDLE, input->keybit);
1184        }
1185        __set_bit(BTN_LEFT, input->keybit);
1186
1187        /* Set up ST parameters */
1188        input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
1189        input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
1190        input_abs_set_res(input, ABS_X, data->x_res);
1191        input_abs_set_res(input, ABS_Y, data->y_res);
1192        input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
1193        if (data->report_features & ETP_FEATURE_REPORT_MK)
1194                input_set_abs_params(input, ABS_TOOL_WIDTH,
1195                                     0, ETP_FINGER_WIDTH, 0, 0);
1196        input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0);
1197
1198        /* And MT parameters */
1199        input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
1200        input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
1201        input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res);
1202        input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res);
1203        input_set_abs_params(input, ABS_MT_PRESSURE, 0,
1204                             ETP_MAX_PRESSURE, 0, 0);
1205        if (data->report_features & ETP_FEATURE_REPORT_MK) {
1206                input_set_abs_params(input, ABS_MT_TOUCH_MAJOR,
1207                                     0, ETP_FINGER_WIDTH * max_width, 0, 0);
1208                input_set_abs_params(input, ABS_MT_TOUCH_MINOR,
1209                                     0, ETP_FINGER_WIDTH * min_width, 0, 0);
1210        }
1211
1212        data->input = input;
1213
1214        return 0;
1215}
1216
1217static void elan_disable_regulator(void *_data)
1218{
1219        struct elan_tp_data *data = _data;
1220
1221        regulator_disable(data->vcc);
1222}
1223
1224static int elan_probe(struct i2c_client *client,
1225                      const struct i2c_device_id *dev_id)
1226{
1227        const struct elan_transport_ops *transport_ops;
1228        struct device *dev = &client->dev;
1229        struct elan_tp_data *data;
1230        unsigned long irqflags;
1231        int error;
1232
1233        if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
1234            i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1235                transport_ops = &elan_i2c_ops;
1236        } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&
1237                   i2c_check_functionality(client->adapter,
1238                                           I2C_FUNC_SMBUS_BYTE_DATA |
1239                                                I2C_FUNC_SMBUS_BLOCK_DATA |
1240                                                I2C_FUNC_SMBUS_I2C_BLOCK)) {
1241                transport_ops = &elan_smbus_ops;
1242        } else {
1243                dev_err(dev, "not a supported I2C/SMBus adapter\n");
1244                return -EIO;
1245        }
1246
1247        data = devm_kzalloc(dev, sizeof(struct elan_tp_data), GFP_KERNEL);
1248        if (!data)
1249                return -ENOMEM;
1250
1251        i2c_set_clientdata(client, data);
1252
1253        data->ops = transport_ops;
1254        data->client = client;
1255        init_completion(&data->fw_completion);
1256        mutex_init(&data->sysfs_mutex);
1257
1258        data->vcc = devm_regulator_get(dev, "vcc");
1259        if (IS_ERR(data->vcc)) {
1260                error = PTR_ERR(data->vcc);
1261                if (error != -EPROBE_DEFER)
1262                        dev_err(dev, "Failed to get 'vcc' regulator: %d\n",
1263                                error);
1264                return error;
1265        }
1266
1267        error = regulator_enable(data->vcc);
1268        if (error) {
1269                dev_err(dev, "Failed to enable regulator: %d\n", error);
1270                return error;
1271        }
1272
1273        error = devm_add_action_or_reset(dev, elan_disable_regulator, data);
1274        if (error) {
1275                dev_err(dev, "Failed to add disable regulator action: %d\n",
1276                        error);
1277                return error;
1278        }
1279
1280        /* Make sure there is something at this address */
1281        error = i2c_smbus_read_byte(client);
1282        if (error < 0) {
1283                dev_dbg(&client->dev, "nothing at this address: %d\n", error);
1284                return -ENXIO;
1285        }
1286
1287        /* Initialize the touchpad. */
1288        error = elan_initialize(data, false);
1289        if (error)
1290                return error;
1291
1292        error = elan_query_device_info(data);
1293        if (error)
1294                return error;
1295
1296        error = elan_query_device_parameters(data);
1297        if (error)
1298                return error;
1299
1300        dev_info(dev,
1301                 "Elan Touchpad: Module ID: 0x%04x, Firmware: 0x%04x, Sample: 0x%04x, IAP: 0x%04x\n",
1302                 data->product_id,
1303                 data->fw_version,
1304                 data->sm_version,
1305                 data->iap_version);
1306
1307        dev_dbg(dev,
1308                "Elan Touchpad Extra Information:\n"
1309                "    Max ABS X,Y:   %d,%d\n"
1310                "    Width X,Y:   %d,%d\n"
1311                "    Resolution X,Y:   %d,%d (dots/mm)\n"
1312                "    ic type: 0x%x\n"
1313                "    info pattern: 0x%x\n",
1314                data->max_x, data->max_y,
1315                data->width_x, data->width_y,
1316                data->x_res, data->y_res,
1317                data->ic_type, data->pattern);
1318
1319        /* Set up input device properties based on queried parameters. */
1320        error = elan_setup_input_device(data);
1321        if (error)
1322                return error;
1323
1324        if (device_property_read_bool(&client->dev, "elan,trackpoint")) {
1325                error = elan_setup_trackpoint_input_device(data);
1326                if (error)
1327                        return error;
1328        }
1329
1330        /*
1331         * Platform code (ACPI, DTS) should normally set up interrupt
1332         * for us, but in case it did not let's fall back to using falling
1333         * edge to be compatible with older Chromebooks.
1334         */
1335        irqflags = irq_get_trigger_type(client->irq);
1336        if (!irqflags)
1337                irqflags = IRQF_TRIGGER_FALLING;
1338
1339        error = devm_request_threaded_irq(dev, client->irq, NULL, elan_isr,
1340                                          irqflags | IRQF_ONESHOT,
1341                                          client->name, data);
1342        if (error) {
1343                dev_err(dev, "cannot register irq=%d\n", client->irq);
1344                return error;
1345        }
1346
1347        error = devm_device_add_groups(dev, elan_sysfs_groups);
1348        if (error) {
1349                dev_err(dev, "failed to create sysfs attributes: %d\n", error);
1350                return error;
1351        }
1352
1353        error = input_register_device(data->input);
1354        if (error) {
1355                dev_err(dev, "failed to register input device: %d\n", error);
1356                return error;
1357        }
1358
1359        if (data->tp_input) {
1360                error = input_register_device(data->tp_input);
1361                if (error) {
1362                        dev_err(&client->dev,
1363                                "failed to register TrackPoint input device: %d\n",
1364                                error);
1365                        return error;
1366                }
1367        }
1368
1369        /*
1370         * Systems using device tree should set up wakeup via DTS,
1371         * the rest will configure device as wakeup source by default.
1372         */
1373        if (!dev->of_node)
1374                device_init_wakeup(dev, true);
1375
1376        return 0;
1377}
1378
1379static int __maybe_unused elan_suspend(struct device *dev)
1380{
1381        struct i2c_client *client = to_i2c_client(dev);
1382        struct elan_tp_data *data = i2c_get_clientdata(client);
1383        int ret;
1384
1385        /*
1386         * We are taking the mutex to make sure sysfs operations are
1387         * complete before we attempt to bring the device into low[er]
1388         * power mode.
1389         */
1390        ret = mutex_lock_interruptible(&data->sysfs_mutex);
1391        if (ret)
1392                return ret;
1393
1394        disable_irq(client->irq);
1395
1396        if (device_may_wakeup(dev)) {
1397                ret = elan_sleep(data);
1398                /* Enable wake from IRQ */
1399                data->irq_wake = (enable_irq_wake(client->irq) == 0);
1400        } else {
1401                ret = elan_disable_power(data);
1402        }
1403
1404        mutex_unlock(&data->sysfs_mutex);
1405        return ret;
1406}
1407
1408static int __maybe_unused elan_resume(struct device *dev)
1409{
1410        struct i2c_client *client = to_i2c_client(dev);
1411        struct elan_tp_data *data = i2c_get_clientdata(client);
1412        int error;
1413
1414        if (device_may_wakeup(dev) && data->irq_wake) {
1415                disable_irq_wake(client->irq);
1416                data->irq_wake = false;
1417        }
1418
1419        error = elan_enable_power(data);
1420        if (error) {
1421                dev_err(dev, "power up when resuming failed: %d\n", error);
1422                goto err;
1423        }
1424
1425        error = elan_initialize(data, data->quirks & ETP_QUIRK_QUICK_WAKEUP);
1426        if (error)
1427                dev_err(dev, "initialize when resuming failed: %d\n", error);
1428
1429err:
1430        enable_irq(data->client->irq);
1431        return error;
1432}
1433
1434static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
1435
1436static const struct i2c_device_id elan_id[] = {
1437        { DRIVER_NAME, 0 },
1438        { },
1439};
1440MODULE_DEVICE_TABLE(i2c, elan_id);
1441
1442#ifdef CONFIG_ACPI
1443#include <linux/input/elan-i2c-ids.h>
1444MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
1445#endif
1446
1447#ifdef CONFIG_OF
1448static const struct of_device_id elan_of_match[] = {
1449        { .compatible = "elan,ekth3000" },
1450        { /* sentinel */ }
1451};
1452MODULE_DEVICE_TABLE(of, elan_of_match);
1453#endif
1454
1455static struct i2c_driver elan_driver = {
1456        .driver = {
1457                .name   = DRIVER_NAME,
1458                .pm     = &elan_pm_ops,
1459                .acpi_match_table = ACPI_PTR(elan_acpi_id),
1460                .of_match_table = of_match_ptr(elan_of_match),
1461                .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1462        },
1463        .probe          = elan_probe,
1464        .id_table       = elan_id,
1465};
1466
1467module_i2c_driver(elan_driver);
1468
1469MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>");
1470MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
1471MODULE_LICENSE("GPL");
1472