drivers/input/mouse/elan_i2c_i2c.c

   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: 林政維 (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
  74 static 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
 100 static 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
 113 static 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
 139 static 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
 178 static 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
 184 static 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
 215 static 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
 221 static int elan_i2c_calibrate(struct i2c_client *client)
 222 {
 223         return elan_i2c_write_cmd(client, ETP_I2C_CALIBRATE_CMD, 1);
 224 }
 225
 226 static 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
 231 static 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
 249 static 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
 270 static 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
 298 static 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
 352 static 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
 367 static 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
 387 static 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
 412 static 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
 430 static 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
 449 static 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
 470 static 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
 492 static 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
 506 static 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
 520 static 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
 555 static 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
 627 static 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
 670 exit:
 671         kfree(page_store);
 672         return error;
 673 }
 674
 675 static 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
 718 static 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
 728 static 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
 749 const 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 };