linux/drivers/input/mouse/elan_i2c_i2c.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Elan I2C/SMBus Touchpad driver - I2C interface
   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 *
   9 * Based on cyapa driver:
  10 * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
  11 * copyright (c) 2011-2012 Google, Inc.
  12 *
  13 * Trademarks are the property of their respective owners.
  14 */
  15
  16#include <linux/completion.h>
  17#include <linux/delay.h>
  18#include <linux/i2c.h>
  19#include <linux/interrupt.h>
  20#include <linux/jiffies.h>
  21#include <linux/kernel.h>
  22#include <linux/slab.h>
  23#include <linux/sched.h>
  24#include <asm/unaligned.h>
  25
  26#include "elan_i2c.h"
  27
  28/* Elan i2c commands */
  29#define ETP_I2C_RESET                   0x0100
  30#define ETP_I2C_WAKE_UP                 0x0800
  31#define ETP_I2C_SLEEP                   0x0801
  32#define ETP_I2C_DESC_CMD                0x0001
  33#define ETP_I2C_REPORT_DESC_CMD         0x0002
  34#define ETP_I2C_STAND_CMD               0x0005
  35#define ETP_I2C_PATTERN_CMD             0x0100
  36#define ETP_I2C_UNIQUEID_CMD            0x0101
  37#define ETP_I2C_FW_VERSION_CMD          0x0102
  38#define ETP_I2C_IC_TYPE_CMD             0x0103
  39#define ETP_I2C_OSM_VERSION_CMD         0x0103
  40#define ETP_I2C_NSM_VERSION_CMD         0x0104
  41#define ETP_I2C_XY_TRACENUM_CMD         0x0105
  42#define ETP_I2C_MAX_X_AXIS_CMD          0x0106
  43#define ETP_I2C_MAX_Y_AXIS_CMD          0x0107
  44#define ETP_I2C_RESOLUTION_CMD          0x0108
  45#define ETP_I2C_PRESSURE_CMD            0x010A
  46#define ETP_I2C_IAP_VERSION_CMD         0x0110
  47#define ETP_I2C_IC_TYPE_P0_CMD          0x0110
  48#define ETP_I2C_IAP_VERSION_P0_CMD      0x0111
  49#define ETP_I2C_SET_CMD                 0x0300
  50#define ETP_I2C_POWER_CMD               0x0307
  51#define ETP_I2C_FW_CHECKSUM_CMD         0x030F
  52#define ETP_I2C_IAP_CTRL_CMD            0x0310
  53#define ETP_I2C_IAP_CMD                 0x0311
  54#define ETP_I2C_IAP_RESET_CMD           0x0314
  55#define ETP_I2C_IAP_CHECKSUM_CMD        0x0315
  56#define ETP_I2C_CALIBRATE_CMD           0x0316
  57#define ETP_I2C_MAX_BASELINE_CMD        0x0317
  58#define ETP_I2C_MIN_BASELINE_CMD        0x0318
  59#define ETP_I2C_IAP_TYPE_REG            0x0040
  60#define ETP_I2C_IAP_TYPE_CMD            0x0304
  61
  62#define ETP_I2C_REPORT_LEN              34
  63#define ETP_I2C_REPORT_LEN_ID2          39
  64#define ETP_I2C_REPORT_MAX_LEN          39
  65#define ETP_I2C_DESC_LENGTH             30
  66#define ETP_I2C_REPORT_DESC_LENGTH      158
  67#define ETP_I2C_INF_LENGTH              2
  68#define ETP_I2C_IAP_PASSWORD            0x1EA5
  69#define ETP_I2C_IAP_RESET               0xF0F0
  70#define ETP_I2C_MAIN_MODE_ON            (1 << 9)
  71#define ETP_I2C_IAP_REG_L               0x01
  72#define ETP_I2C_IAP_REG_H               0x06
  73
  74static int elan_i2c_read_block(struct i2c_client *client,
  75                               u16 reg, u8 *val, u16 len)
  76{
  77        __le16 buf[] = {
  78                cpu_to_le16(reg),
  79        };
  80        struct i2c_msg msgs[] = {
  81                {
  82                        .addr = client->addr,
  83                        .flags = client->flags & I2C_M_TEN,
  84                        .len = sizeof(buf),
  85                        .buf = (u8 *)buf,
  86                },
  87                {
  88                        .addr = client->addr,
  89                        .flags = (client->flags & I2C_M_TEN) | I2C_M_RD,
  90                        .len = len,
  91                        .buf = val,
  92                }
  93        };
  94        int ret;
  95
  96        ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
  97        return ret == ARRAY_SIZE(msgs) ? 0 : (ret < 0 ? ret : -EIO);
  98}
  99
 100static int elan_i2c_read_cmd(struct i2c_client *client, u16 reg, u8 *val)
 101{
 102        int retval;
 103
 104        retval = elan_i2c_read_block(client, reg, val, ETP_I2C_INF_LENGTH);
 105        if (retval < 0) {
 106                dev_err(&client->dev, "reading cmd (0x%04x) fail.\n", reg);
 107                return retval;
 108        }
 109
 110        return 0;
 111}
 112
 113static int elan_i2c_write_cmd(struct i2c_client *client, u16 reg, u16 cmd)
 114{
 115        __le16 buf[] = {
 116                cpu_to_le16(reg),
 117                cpu_to_le16(cmd),
 118        };
 119        struct i2c_msg msg = {
 120                .addr = client->addr,
 121                .flags = client->flags & I2C_M_TEN,
 122                .len = sizeof(buf),
 123                .buf = (u8 *)buf,
 124        };
 125        int ret;
 126
 127        ret = i2c_transfer(client->adapter, &msg, 1);
 128        if (ret != 1) {
 129                if (ret >= 0)
 130                        ret = -EIO;
 131                dev_err(&client->dev, "writing cmd (0x%04x) failed: %d\n",
 132                        reg, ret);
 133                return ret;
 134        }
 135
 136        return 0;
 137}
 138
 139static int elan_i2c_initialize(struct i2c_client *client)
 140{
 141        struct device *dev = &client->dev;
 142        int error;
 143        u8 val[256];
 144
 145        error = elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, ETP_I2C_RESET);
 146        if (error) {
 147                dev_err(dev, "device reset failed: %d\n", error);
 148                return error;
 149        }
 150
 151        /* Wait for the device to reset */
 152        msleep(100);
 153
 154        /* get reset acknowledgement 0000 */
 155        error = i2c_master_recv(client, val, ETP_I2C_INF_LENGTH);
 156        if (error < 0) {
 157                dev_err(dev, "failed to read reset response: %d\n", error);
 158                return error;
 159        }
 160
 161        error = elan_i2c_read_block(client, ETP_I2C_DESC_CMD,
 162                                    val, ETP_I2C_DESC_LENGTH);
 163        if (error) {
 164                dev_err(dev, "cannot get device descriptor: %d\n", error);
 165                return error;
 166        }
 167
 168        error = elan_i2c_read_block(client, ETP_I2C_REPORT_DESC_CMD,
 169                                    val, ETP_I2C_REPORT_DESC_LENGTH);
 170        if (error) {
 171                dev_err(dev, "fetching report descriptor failed.: %d\n", error);
 172                return error;
 173        }
 174
 175        return 0;
 176}
 177
 178static int elan_i2c_sleep_control(struct i2c_client *client, bool sleep)
 179{
 180        return elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD,
 181                                  sleep ? ETP_I2C_SLEEP : ETP_I2C_WAKE_UP);
 182}
 183
 184static int elan_i2c_power_control(struct i2c_client *client, bool enable)
 185{
 186        u8 val[2];
 187        u16 reg;
 188        int error;
 189
 190        error = elan_i2c_read_cmd(client, ETP_I2C_POWER_CMD, val);
 191        if (error) {
 192                dev_err(&client->dev,
 193                        "failed to read current power state: %d\n",
 194                        error);
 195                return error;
 196        }
 197
 198        reg = le16_to_cpup((__le16 *)val);
 199        if (enable)
 200                reg &= ~ETP_DISABLE_POWER;
 201        else
 202                reg |= ETP_DISABLE_POWER;
 203
 204        error = elan_i2c_write_cmd(client, ETP_I2C_POWER_CMD, reg);
 205        if (error) {
 206                dev_err(&client->dev,
 207                        "failed to write current power state: %d\n",
 208                        error);
 209                return error;
 210        }
 211
 212        return 0;
 213}
 214
 215static int elan_i2c_set_mode(struct i2c_client *client, u8 mode)
 216{
 217        return elan_i2c_write_cmd(client, ETP_I2C_SET_CMD, mode);
 218}
 219
 220
 221static int elan_i2c_calibrate(struct i2c_client *client)
 222{
 223        return elan_i2c_write_cmd(client, ETP_I2C_CALIBRATE_CMD, 1);
 224}
 225
 226static int elan_i2c_calibrate_result(struct i2c_client *client, u8 *val)
 227{
 228        return elan_i2c_read_block(client, ETP_I2C_CALIBRATE_CMD, val, 1);
 229}
 230
 231static int elan_i2c_get_baseline_data(struct i2c_client *client,
 232                                      bool max_baseline, u8 *value)
 233{
 234        int error;
 235        u8 val[3];
 236
 237        error = elan_i2c_read_cmd(client,
 238                                  max_baseline ? ETP_I2C_MAX_BASELINE_CMD :
 239                                                 ETP_I2C_MIN_BASELINE_CMD,
 240                                  val);
 241        if (error)
 242                return error;
 243
 244        *value = le16_to_cpup((__le16 *)val);
 245
 246        return 0;
 247}
 248
 249static int elan_i2c_get_pattern(struct i2c_client *client, u8 *pattern)
 250{
 251        int error;
 252        u8 val[3];
 253
 254        error = elan_i2c_read_cmd(client, ETP_I2C_PATTERN_CMD, val);
 255        if (error) {
 256                dev_err(&client->dev, "failed to get pattern: %d\n", error);
 257                return error;
 258        }
 259
 260        /*
 261         * Not all versions of firmware implement "get pattern" command.
 262         * When this command is not implemented the device will respond
 263         * with 0xFF 0xFF, which we will treat as "old" pattern 0.
 264         */
 265        *pattern = val[0] == 0xFF && val[1] == 0xFF ? 0 : val[1];
 266
 267        return 0;
 268}
 269
 270static int elan_i2c_get_version(struct i2c_client *client,
 271                                u8 pattern, bool iap, u8 *version)
 272{
 273        int error;
 274        u16 cmd;
 275        u8 val[3];
 276
 277        if (!iap)
 278                cmd = ETP_I2C_FW_VERSION_CMD;
 279        else if (pattern == 0)
 280                cmd = ETP_I2C_IAP_VERSION_P0_CMD;
 281        else
 282                cmd = ETP_I2C_IAP_VERSION_CMD;
 283
 284        error = elan_i2c_read_cmd(client, cmd, val);
 285        if (error) {
 286                dev_err(&client->dev, "failed to get %s version: %d\n",
 287                        iap ? "IAP" : "FW", error);
 288                return error;
 289        }
 290
 291        if (pattern >= 0x01)
 292                *version = iap ? val[1] : val[0];
 293        else
 294                *version = val[0];
 295        return 0;
 296}
 297
 298static int elan_i2c_get_sm_version(struct i2c_client *client, u8 pattern,
 299                                   u16 *ic_type, u8 *version, u8 *clickpad)
 300{
 301        int error;
 302        u8 val[3];
 303
 304        if (pattern >= 0x01) {
 305                error = elan_i2c_read_cmd(client, ETP_I2C_IC_TYPE_CMD, val);
 306                if (error) {
 307                        dev_err(&client->dev, "failed to get ic type: %d\n",
 308                                error);
 309                        return error;
 310                }
 311                *ic_type = be16_to_cpup((__be16 *)val);
 312
 313                error = elan_i2c_read_cmd(client, ETP_I2C_NSM_VERSION_CMD,
 314                                          val);
 315                if (error) {
 316                        dev_err(&client->dev, "failed to get SM version: %d\n",
 317                                error);
 318                        return error;
 319                }
 320                *version = val[1];
 321                *clickpad = val[0] & 0x10;
 322        } else {
 323                error = elan_i2c_read_cmd(client, ETP_I2C_OSM_VERSION_CMD, val);
 324                if (error) {
 325                        dev_err(&client->dev, "failed to get SM version: %d\n",
 326                                error);
 327                        return error;
 328                }
 329                *version = val[0];
 330
 331                error = elan_i2c_read_cmd(client, ETP_I2C_IC_TYPE_P0_CMD, val);
 332                if (error) {
 333                        dev_err(&client->dev, "failed to get ic type: %d\n",
 334                                error);
 335                        return error;
 336                }
 337                *ic_type = val[0];
 338
 339                error = elan_i2c_read_cmd(client, ETP_I2C_NSM_VERSION_CMD,
 340                                          val);
 341                if (error) {
 342                        dev_err(&client->dev, "failed to get SM version: %d\n",
 343                                error);
 344                        return error;
 345                }
 346                *clickpad = val[0] & 0x10;
 347        }
 348
 349        return 0;
 350}
 351
 352static int elan_i2c_get_product_id(struct i2c_client *client, u16 *id)
 353{
 354        int error;
 355        u8 val[3];
 356
 357        error = elan_i2c_read_cmd(client, ETP_I2C_UNIQUEID_CMD, val);
 358        if (error) {
 359                dev_err(&client->dev, "failed to get product ID: %d\n", error);
 360                return error;
 361        }
 362
 363        *id = le16_to_cpup((__le16 *)val);
 364        return 0;
 365}
 366
 367static int elan_i2c_get_checksum(struct i2c_client *client,
 368                                 bool iap, u16 *csum)
 369{
 370        int error;
 371        u8 val[3];
 372
 373        error = elan_i2c_read_cmd(client,
 374                                  iap ? ETP_I2C_IAP_CHECKSUM_CMD :
 375                                        ETP_I2C_FW_CHECKSUM_CMD,
 376                                  val);
 377        if (error) {
 378                dev_err(&client->dev, "failed to get %s checksum: %d\n",
 379                        iap ? "IAP" : "FW", error);
 380                return error;
 381        }
 382
 383        *csum = le16_to_cpup((__le16 *)val);
 384        return 0;
 385}
 386
 387static int elan_i2c_get_max(struct i2c_client *client,
 388                            unsigned int *max_x, unsigned int *max_y)
 389{
 390        int error;
 391        u8 val[3];
 392
 393        error = elan_i2c_read_cmd(client, ETP_I2C_MAX_X_AXIS_CMD, val);
 394        if (error) {
 395                dev_err(&client->dev, "failed to get X dimension: %d\n", error);
 396                return error;
 397        }
 398
 399        *max_x = le16_to_cpup((__le16 *)val);
 400
 401        error = elan_i2c_read_cmd(client, ETP_I2C_MAX_Y_AXIS_CMD, val);
 402        if (error) {
 403                dev_err(&client->dev, "failed to get Y dimension: %d\n", error);
 404                return error;
 405        }
 406
 407        *max_y = le16_to_cpup((__le16 *)val);
 408
 409        return 0;
 410}
 411
 412static int elan_i2c_get_resolution(struct i2c_client *client,
 413                                   u8 *hw_res_x, u8 *hw_res_y)
 414{
 415        int error;
 416        u8 val[3];
 417
 418        error = elan_i2c_read_cmd(client, ETP_I2C_RESOLUTION_CMD, val);
 419        if (error) {
 420                dev_err(&client->dev, "failed to get resolution: %d\n", error);
 421                return error;
 422        }
 423
 424        *hw_res_x = val[0];
 425        *hw_res_y = val[1];
 426
 427        return 0;
 428}
 429
 430static int elan_i2c_get_num_traces(struct i2c_client *client,
 431                                   unsigned int *x_traces,
 432                                   unsigned int *y_traces)
 433{
 434        int error;
 435        u8 val[3];
 436
 437        error = elan_i2c_read_cmd(client, ETP_I2C_XY_TRACENUM_CMD, val);
 438        if (error) {
 439                dev_err(&client->dev, "failed to get trace info: %d\n", error);
 440                return error;
 441        }
 442
 443        *x_traces = val[0];
 444        *y_traces = val[1];
 445
 446        return 0;
 447}
 448
 449static int elan_i2c_get_pressure_adjustment(struct i2c_client *client,
 450                                            int *adjustment)
 451{
 452        int error;
 453        u8 val[3];
 454
 455        error = elan_i2c_read_cmd(client, ETP_I2C_PRESSURE_CMD, val);
 456        if (error) {
 457                dev_err(&client->dev, "failed to get pressure format: %d\n",
 458                        error);
 459                return error;
 460        }
 461
 462        if ((val[0] >> 4) & 0x1)
 463                *adjustment = 0;
 464        else
 465                *adjustment = ETP_PRESSURE_OFFSET;
 466
 467        return 0;
 468}
 469
 470static int elan_i2c_iap_get_mode(struct i2c_client *client, enum tp_mode *mode)
 471{
 472        int error;
 473        u16 constant;
 474        u8 val[3];
 475
 476        error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
 477        if (error) {
 478                dev_err(&client->dev,
 479                        "failed to read iap control register: %d\n",
 480                        error);
 481                return error;
 482        }
 483
 484        constant = le16_to_cpup((__le16 *)val);
 485        dev_dbg(&client->dev, "iap control reg: 0x%04x.\n", constant);
 486
 487        *mode = (constant & ETP_I2C_MAIN_MODE_ON) ? MAIN_MODE : IAP_MODE;
 488
 489        return 0;
 490}
 491
 492static int elan_i2c_iap_reset(struct i2c_client *client)
 493{
 494        int error;
 495
 496        error = elan_i2c_write_cmd(client, ETP_I2C_IAP_RESET_CMD,
 497                                   ETP_I2C_IAP_RESET);
 498        if (error) {
 499                dev_err(&client->dev, "cannot reset IC: %d\n", error);
 500                return error;
 501        }
 502
 503        return 0;
 504}
 505
 506static int elan_i2c_set_flash_key(struct i2c_client *client)
 507{
 508        int error;
 509
 510        error = elan_i2c_write_cmd(client, ETP_I2C_IAP_CMD,
 511                                   ETP_I2C_IAP_PASSWORD);
 512        if (error) {
 513                dev_err(&client->dev, "cannot set flash key: %d\n", error);
 514                return error;
 515        }
 516
 517        return 0;
 518}
 519
 520static int elan_read_write_iap_type(struct i2c_client *client, u16 fw_page_size)
 521{
 522        int error;
 523        u16 constant;
 524        u8 val[3];
 525        int retry = 3;
 526
 527        do {
 528                error = elan_i2c_write_cmd(client, ETP_I2C_IAP_TYPE_CMD,
 529                                           fw_page_size / 2);
 530                if (error) {
 531                        dev_err(&client->dev,
 532                                "cannot write iap type: %d\n", error);
 533                        return error;
 534                }
 535
 536                error = elan_i2c_read_cmd(client, ETP_I2C_IAP_TYPE_CMD, val);
 537                if (error) {
 538                        dev_err(&client->dev,
 539                                "failed to read iap type register: %d\n",
 540                                error);
 541                        return error;
 542                }
 543                constant = le16_to_cpup((__le16 *)val);
 544                dev_dbg(&client->dev, "iap type reg: 0x%04x\n", constant);
 545
 546                if (constant == fw_page_size / 2)
 547                        return 0;
 548
 549        } while (--retry > 0);
 550
 551        dev_err(&client->dev, "cannot set iap type\n");
 552        return -EIO;
 553}
 554
 555static int elan_i2c_prepare_fw_update(struct i2c_client *client, u16 ic_type,
 556                                      u8 iap_version, u16 fw_page_size)
 557{
 558        struct device *dev = &client->dev;
 559        int error;
 560        enum tp_mode mode;
 561        u8 val[3];
 562        u16 password;
 563
 564        /* Get FW in which mode (IAP_MODE/MAIN_MODE)  */
 565        error = elan_i2c_iap_get_mode(client, &mode);
 566        if (error)
 567                return error;
 568
 569        if (mode == IAP_MODE) {
 570                /* Reset IC */
 571                error = elan_i2c_iap_reset(client);
 572                if (error)
 573                        return error;
 574
 575                msleep(30);
 576        }
 577
 578        /* Set flash key*/
 579        error = elan_i2c_set_flash_key(client);
 580        if (error)
 581                return error;
 582
 583        /* Wait for F/W IAP initialization */
 584        msleep(mode == MAIN_MODE ? 100 : 30);
 585
 586        /* Check if we are in IAP mode or not */
 587        error = elan_i2c_iap_get_mode(client, &mode);
 588        if (error)
 589                return error;
 590
 591        if (mode == MAIN_MODE) {
 592                dev_err(dev, "wrong mode: %d\n", mode);
 593                return -EIO;
 594        }
 595
 596        if (ic_type >= 0x0D && iap_version >= 1) {
 597                error = elan_read_write_iap_type(client, fw_page_size);
 598                if (error)
 599                        return error;
 600        }
 601
 602        /* Set flash key again */
 603        error = elan_i2c_set_flash_key(client);
 604        if (error)
 605                return error;
 606
 607        /* Wait for F/W IAP initialization */
 608        msleep(30);
 609
 610        /* read back to check we actually enabled successfully. */
 611        error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CMD, val);
 612        if (error) {
 613                dev_err(dev, "cannot read iap password: %d\n",
 614                        error);
 615                return error;
 616        }
 617
 618        password = le16_to_cpup((__le16 *)val);
 619        if (password != ETP_I2C_IAP_PASSWORD) {
 620                dev_err(dev, "wrong iap password: 0x%X\n", password);
 621                return -EIO;
 622        }
 623
 624        return 0;
 625}
 626
 627static int elan_i2c_write_fw_block(struct i2c_client *client, u16 fw_page_size,
 628                                   const u8 *page, u16 checksum, int idx)
 629{
 630        struct device *dev = &client->dev;
 631        u8 *page_store;
 632        u8 val[3];
 633        u16 result;
 634        int ret, error;
 635
 636        page_store = kmalloc(fw_page_size + 4, GFP_KERNEL);
 637        if (!page_store)
 638                return -ENOMEM;
 639
 640        page_store[0] = ETP_I2C_IAP_REG_L;
 641        page_store[1] = ETP_I2C_IAP_REG_H;
 642        memcpy(&page_store[2], page, fw_page_size);
 643        /* recode checksum at last two bytes */
 644        put_unaligned_le16(checksum, &page_store[fw_page_size + 2]);
 645
 646        ret = i2c_master_send(client, page_store, fw_page_size + 4);
 647        if (ret != fw_page_size + 4) {
 648                error = ret < 0 ? ret : -EIO;
 649                dev_err(dev, "Failed to write page %d: %d\n", idx, error);
 650                goto exit;
 651        }
 652
 653        /* Wait for F/W to update one page ROM data. */
 654        msleep(fw_page_size == ETP_FW_PAGE_SIZE_512 ? 50 : 35);
 655
 656        error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
 657        if (error) {
 658                dev_err(dev, "Failed to read IAP write result: %d\n", error);
 659                goto exit;
 660        }
 661
 662        result = le16_to_cpup((__le16 *)val);
 663        if (result & (ETP_FW_IAP_PAGE_ERR | ETP_FW_IAP_INTF_ERR)) {
 664                dev_err(dev, "IAP reports failed write: %04hx\n",
 665                        result);
 666                error = -EIO;
 667                goto exit;
 668        }
 669
 670exit:
 671        kfree(page_store);
 672        return error;
 673}
 674
 675static int elan_i2c_finish_fw_update(struct i2c_client *client,
 676                                     struct completion *completion)
 677{
 678        struct device *dev = &client->dev;
 679        int error = 0;
 680        int len;
 681        u8 buffer[ETP_I2C_REPORT_MAX_LEN];
 682
 683        len = i2c_master_recv(client, buffer, ETP_I2C_REPORT_MAX_LEN);
 684        if (len <= 0) {
 685                error = len < 0 ? len : -EIO;
 686                dev_warn(dev, "failed to read I2C data after FW WDT reset: %d (%d)\n",
 687                        error, len);
 688        }
 689
 690        reinit_completion(completion);
 691        enable_irq(client->irq);
 692
 693        error = elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, ETP_I2C_RESET);
 694        if (error) {
 695                dev_err(dev, "device reset failed: %d\n", error);
 696        } else if (!wait_for_completion_timeout(completion,
 697                                                msecs_to_jiffies(300))) {
 698                dev_err(dev, "timeout waiting for device reset\n");
 699                error = -ETIMEDOUT;
 700        }
 701
 702        disable_irq(client->irq);
 703
 704        if (error)
 705                return error;
 706
 707        len = i2c_master_recv(client, buffer, ETP_I2C_INF_LENGTH);
 708        if (len != ETP_I2C_INF_LENGTH) {
 709                error = len < 0 ? len : -EIO;
 710                dev_err(dev, "failed to read INT signal: %d (%d)\n",
 711                        error, len);
 712                return error;
 713        }
 714
 715        return 0;
 716}
 717
 718static int elan_i2c_get_report_features(struct i2c_client *client, u8 pattern,
 719                                        unsigned int *features,
 720                                        unsigned int *report_len)
 721{
 722        *features = ETP_FEATURE_REPORT_MK;
 723        *report_len = pattern <= 0x01 ?
 724                        ETP_I2C_REPORT_LEN : ETP_I2C_REPORT_LEN_ID2;
 725        return 0;
 726}
 727
 728static int elan_i2c_get_report(struct i2c_client *client,
 729                               u8 *report, unsigned int report_len)
 730{
 731        int len;
 732
 733        len = i2c_master_recv(client, report, report_len);
 734        if (len < 0) {
 735                dev_err(&client->dev, "failed to read report data: %d\n", len);
 736                return len;
 737        }
 738
 739        if (len != report_len) {
 740                dev_err(&client->dev,
 741                        "wrong report length (%d vs %d expected)\n",
 742                        len, report_len);
 743                return -EIO;
 744        }
 745
 746        return 0;
 747}
 748
 749const struct elan_transport_ops elan_i2c_ops = {
 750        .initialize             = elan_i2c_initialize,
 751        .sleep_control          = elan_i2c_sleep_control,
 752        .power_control          = elan_i2c_power_control,
 753        .set_mode               = elan_i2c_set_mode,
 754
 755        .calibrate              = elan_i2c_calibrate,
 756        .calibrate_result       = elan_i2c_calibrate_result,
 757
 758        .get_baseline_data      = elan_i2c_get_baseline_data,
 759
 760        .get_version            = elan_i2c_get_version,
 761        .get_sm_version         = elan_i2c_get_sm_version,
 762        .get_product_id         = elan_i2c_get_product_id,
 763        .get_checksum           = elan_i2c_get_checksum,
 764        .get_pressure_adjustment = elan_i2c_get_pressure_adjustment,
 765
 766        .get_max                = elan_i2c_get_max,
 767        .get_resolution         = elan_i2c_get_resolution,
 768        .get_num_traces         = elan_i2c_get_num_traces,
 769
 770        .iap_get_mode           = elan_i2c_iap_get_mode,
 771        .iap_reset              = elan_i2c_iap_reset,
 772
 773        .prepare_fw_update      = elan_i2c_prepare_fw_update,
 774        .write_fw_block         = elan_i2c_write_fw_block,
 775        .finish_fw_update       = elan_i2c_finish_fw_update,
 776
 777        .get_pattern            = elan_i2c_get_pattern,
 778
 779        .get_report_features    = elan_i2c_get_report_features,
 780        .get_report             = elan_i2c_get_report,
 781};
 782