drivers/input/touchscreen/elants_i2c.c

   1 /*
   2  * Elan Microelectronics touch panels with I2C interface
   3  *
   4  * Copyright (C) 2014 Elan Microelectronics Corporation.
   5  * Scott Liu <scott.liu@emc.com.tw>
   6  *
   7  * This code is partly based on hid-multitouch.c:
   8  *
   9  *  Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
  10  *  Copyright (c) 2010-2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
  11  *  Copyright (c) 2010-2012 Ecole Nationale de l'Aviation Civile, France
  12  *
  13  *
  14  * This code is partly based on i2c-hid.c:
  15  *
  16  * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
  17  * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
  18  * Copyright (c) 2012 Red Hat, Inc
  19  */
  20
  21 /*
  22  * This software is licensed under the terms of the GNU General Public
  23  * License version 2, as published by the Free Software Foundation, and
  24  * may be copied, distributed, and modified under those terms.
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/input.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/async.h>
  32 #include <linux/i2c.h>
  33 #include <linux/delay.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/buffer_head.h>
  36 #include <linux/slab.h>
  37 #include <linux/firmware.h>
  38 #include <linux/input/mt.h>
  39 #include <linux/acpi.h>
  40 #include <linux/of.h>
  41 #include <linux/gpio/consumer.h>
  42 #include <linux/regulator/consumer.h>
  43 #include <linux/uuid.h>
  44 #include <asm/unaligned.h>
  45
  46 /* Device, Driver information */
  47 #define DEVICE_NAME     "elants_i2c"
  48 #define DRV_VERSION     "1.0.9"
  49
  50 /* Convert from rows or columns into resolution */
  51 #define ELAN_TS_RESOLUTION(n, m)   (((n) - 1) * (m))
  52
  53 /* FW header data */
  54 #define HEADER_SIZE             4
  55 #define FW_HDR_TYPE             0
  56 #define FW_HDR_COUNT            1
  57 #define FW_HDR_LENGTH           2
  58
  59 /* Buffer mode Queue Header information */
  60 #define QUEUE_HEADER_SINGLE     0x62
  61 #define QUEUE_HEADER_NORMAL     0X63
  62 #define QUEUE_HEADER_WAIT       0x64
  63
  64 /* Command header definition */
  65 #define CMD_HEADER_WRITE        0x54
  66 #define CMD_HEADER_READ         0x53
  67 #define CMD_HEADER_6B_READ      0x5B
  68 #define CMD_HEADER_RESP         0x52
  69 #define CMD_HEADER_6B_RESP      0x9B
  70 #define CMD_HEADER_HELLO        0x55
  71 #define CMD_HEADER_REK          0x66
  72
  73 /* FW position data */
  74 #define PACKET_SIZE             55
  75 #define MAX_CONTACT_NUM         10
  76 #define FW_POS_HEADER           0
  77 #define FW_POS_STATE            1
  78 #define FW_POS_TOTAL            2
  79 #define FW_POS_XY               3
  80 #define FW_POS_CHECKSUM         34
  81 #define FW_POS_WIDTH            35
  82 #define FW_POS_PRESSURE         45
  83
  84 #define HEADER_REPORT_10_FINGER 0x62
  85
  86 /* Header (4 bytes) plus 3 fill 10-finger packets */
  87 #define MAX_PACKET_SIZE         169
  88
  89 #define BOOT_TIME_DELAY_MS      50
  90
  91 /* FW read command, 0x53 0x?? 0x0, 0x01 */
  92 #define E_ELAN_INFO_FW_VER      0x00
  93 #define E_ELAN_INFO_BC_VER      0x10
  94 #define E_ELAN_INFO_TEST_VER    0xE0
  95 #define E_ELAN_INFO_FW_ID       0xF0
  96 #define E_INFO_OSR              0xD6
  97 #define E_INFO_PHY_SCAN         0xD7
  98 #define E_INFO_PHY_DRIVER       0xD8
  99
 100 #define MAX_RETRIES             3
 101 #define MAX_FW_UPDATE_RETRIES   30
 102
 103 #define ELAN_FW_PAGESIZE        132
 104
 105 /* calibration timeout definition */
 106 #define ELAN_CALI_TIMEOUT_MSEC  12000
 107
 108 #define ELAN_POWERON_DELAY_USEC 500
 109 #define ELAN_RESET_DELAY_MSEC   20
 110
 111 enum elants_state {
 112         ELAN_STATE_NORMAL,
 113         ELAN_WAIT_QUEUE_HEADER,
 114         ELAN_WAIT_RECALIBRATION,
 115 };
 116
 117 enum elants_iap_mode {
 118         ELAN_IAP_OPERATIONAL,
 119         ELAN_IAP_RECOVERY,
 120 };
 121
 122 /* struct elants_data - represents state of Elan touchscreen device */
 123 struct elants_data {
 124         struct i2c_client *client;
 125         struct input_dev *input;
 126
 127         struct regulator *vcc33;
 128         struct regulator *vccio;
 129         struct gpio_desc *reset_gpio;
 130
 131         u16 fw_version;
 132         u8 test_version;
 133         u8 solution_version;
 134         u8 bc_version;
 135         u8 iap_version;
 136         u16 hw_version;
 137         unsigned int x_res;     /* resolution in units/mm */
 138         unsigned int y_res;
 139         unsigned int x_max;
 140         unsigned int y_max;
 141
 142         enum elants_state state;
 143         enum elants_iap_mode iap_mode;
 144
 145         /* Guards against concurrent access to the device via sysfs */
 146         struct mutex sysfs_mutex;
 147
 148         u8 cmd_resp[HEADER_SIZE];
 149         struct completion cmd_done;
 150
 151         u8 buf[MAX_PACKET_SIZE];
 152
 153         bool wake_irq_enabled;
 154         bool keep_power_in_suspend;
 155 };
 156
 157 static int elants_i2c_send(struct i2c_client *client,
 158                            const void *data, size_t size)
 159 {
 160         int ret;
 161
 162         ret = i2c_master_send(client, data, size);
 163         if (ret == size)
 164                 return 0;
 165
 166         if (ret >= 0)
 167                 ret = -EIO;
 168
 169         dev_err(&client->dev, "%s failed (%*ph): %d\n",
 170                 __func__, (int)size, data, ret);
 171
 172         return ret;
 173 }
 174
 175 static int elants_i2c_read(struct i2c_client *client, void *data, size_t size)
 176 {
 177         int ret;
 178
 179         ret = i2c_master_recv(client, data, size);
 180         if (ret == size)
 181                 return 0;
 182
 183         if (ret >= 0)
 184                 ret = -EIO;
 185
 186         dev_err(&client->dev, "%s failed: %d\n", __func__, ret);
 187
 188         return ret;
 189 }
 190
 191 static int elants_i2c_execute_command(struct i2c_client *client,
 192                                       const u8 *cmd, size_t cmd_size,
 193                                       u8 *resp, size_t resp_size)
 194 {
 195         struct i2c_msg msgs[2];
 196         int ret;
 197         u8 expected_response;
 198
 199         switch (cmd[0]) {
 200         case CMD_HEADER_READ:
 201                 expected_response = CMD_HEADER_RESP;
 202                 break;
 203
 204         case CMD_HEADER_6B_READ:
 205                 expected_response = CMD_HEADER_6B_RESP;
 206                 break;
 207
 208         default:
 209                 dev_err(&client->dev, "%s: invalid command %*ph\n",
 210                         __func__, (int)cmd_size, cmd);
 211                 return -EINVAL;
 212         }
 213
 214         msgs[0].addr = client->addr;
 215         msgs[0].flags = client->flags & I2C_M_TEN;
 216         msgs[0].len = cmd_size;
 217         msgs[0].buf = (u8 *)cmd;
 218
 219         msgs[1].addr = client->addr;
 220         msgs[1].flags = client->flags & I2C_M_TEN;
 221         msgs[1].flags |= I2C_M_RD;
 222         msgs[1].len = resp_size;
 223         msgs[1].buf = resp;
 224
 225         ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
 226         if (ret < 0)
 227                 return ret;
 228
 229         if (ret != ARRAY_SIZE(msgs) || resp[FW_HDR_TYPE] != expected_response)
 230                 return -EIO;
 231
 232         return 0;
 233 }
 234
 235 static int elants_i2c_calibrate(struct elants_data *ts)
 236 {
 237         struct i2c_client *client = ts->client;
 238         int ret, error;
 239         static const u8 w_flashkey[] = { 0x54, 0xC0, 0xE1, 0x5A };
 240         static const u8 rek[] = { 0x54, 0x29, 0x00, 0x01 };
 241         static const u8 rek_resp[] = { CMD_HEADER_REK, 0x66, 0x66, 0x66 };
 242
 243         disable_irq(client->irq);
 244
 245         ts->state = ELAN_WAIT_RECALIBRATION;
 246         reinit_completion(&ts->cmd_done);
 247
 248         elants_i2c_send(client, w_flashkey, sizeof(w_flashkey));
 249         elants_i2c_send(client, rek, sizeof(rek));
 250
 251         enable_irq(client->irq);
 252
 253         ret = wait_for_completion_interruptible_timeout(&ts->cmd_done,
 254                                 msecs_to_jiffies(ELAN_CALI_TIMEOUT_MSEC));
 255
 256         ts->state = ELAN_STATE_NORMAL;
 257
 258         if (ret <= 0) {
 259                 error = ret < 0 ? ret : -ETIMEDOUT;
 260                 dev_err(&client->dev,
 261                         "error while waiting for calibration to complete: %d\n",
 262                         error);
 263                 return error;
 264         }
 265
 266         if (memcmp(rek_resp, ts->cmd_resp, sizeof(rek_resp))) {
 267                 dev_err(&client->dev,
 268                         "unexpected calibration response: %*ph\n",
 269                         (int)sizeof(ts->cmd_resp), ts->cmd_resp);
 270                 return -EINVAL;
 271         }
 272
 273         return 0;
 274 }
 275
 276 static int elants_i2c_sw_reset(struct i2c_client *client)
 277 {
 278         const u8 soft_rst_cmd[] = { 0x77, 0x77, 0x77, 0x77 };
 279         int error;
 280
 281         error = elants_i2c_send(client, soft_rst_cmd,
 282                                 sizeof(soft_rst_cmd));
 283         if (error) {
 284                 dev_err(&client->dev, "software reset failed: %d\n", error);
 285                 return error;
 286         }
 287
 288         /*
 289          * We should wait at least 10 msec (but no more than 40) before
 290          * sending fastboot or IAP command to the device.
 291          */
 292         msleep(30);
 293
 294         return 0;
 295 }
 296
 297 static u16 elants_i2c_parse_version(u8 *buf)
 298 {
 299         return get_unaligned_be32(buf) >> 4;
 300 }
 301
 302 static int elants_i2c_query_hw_version(struct elants_data *ts)
 303 {
 304         struct i2c_client *client = ts->client;
 305         int error, retry_cnt;
 306         const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 };
 307         u8 resp[HEADER_SIZE];
 308
 309         for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
 310                 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
 311                                                    resp, sizeof(resp));
 312                 if (!error) {
 313                         ts->hw_version = elants_i2c_parse_version(resp);
 314                         if (ts->hw_version != 0xffff)
 315                                 return 0;
 316                 }
 317
 318                 dev_dbg(&client->dev, "read fw id error=%d, buf=%*phC\n",
 319                         error, (int)sizeof(resp), resp);
 320         }
 321
 322         if (error) {
 323                 dev_err(&client->dev,
 324                         "Failed to read fw id: %d\n", error);
 325                 return error;
 326         }
 327
 328         dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version);
 329
 330         return -EINVAL;
 331 }
 332
 333 static int elants_i2c_query_fw_version(struct elants_data *ts)
 334 {
 335         struct i2c_client *client = ts->client;
 336         int error, retry_cnt;
 337         const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 };
 338         u8 resp[HEADER_SIZE];
 339
 340         for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
 341                 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
 342                                                    resp, sizeof(resp));
 343                 if (!error) {
 344                         ts->fw_version = elants_i2c_parse_version(resp);
 345                         if (ts->fw_version != 0x0000 &&
 346                             ts->fw_version != 0xffff)
 347                                 return 0;
 348                 }
 349
 350                 dev_dbg(&client->dev, "read fw version error=%d, buf=%*phC\n",
 351                         error, (int)sizeof(resp), resp);
 352         }
 353
 354         dev_err(&client->dev,
 355                 "Failed to read fw version or fw version is invalid\n");
 356
 357         return -EINVAL;
 358 }
 359
 360 static int elants_i2c_query_test_version(struct elants_data *ts)
 361 {
 362         struct i2c_client *client = ts->client;
 363         int error, retry_cnt;
 364         u16 version;
 365         const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 };
 366         u8 resp[HEADER_SIZE];
 367
 368         for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
 369                 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
 370                                                    resp, sizeof(resp));
 371                 if (!error) {
 372                         version = elants_i2c_parse_version(resp);
 373                         ts->test_version = version >> 8;
 374                         ts->solution_version = version & 0xff;
 375
 376                         return 0;
 377                 }
 378
 379                 dev_dbg(&client->dev,
 380                         "read test version error rc=%d, buf=%*phC\n",
 381                         error, (int)sizeof(resp), resp);
 382         }
 383
 384         dev_err(&client->dev, "Failed to read test version\n");
 385
 386         return -EINVAL;
 387 }
 388
 389 static int elants_i2c_query_bc_version(struct elants_data *ts)
 390 {
 391         struct i2c_client *client = ts->client;
 392         const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_BC_VER, 0x00, 0x01 };
 393         u8 resp[HEADER_SIZE];
 394         u16 version;
 395         int error;
 396
 397         error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
 398                                            resp, sizeof(resp));
 399         if (error) {
 400                 dev_err(&client->dev,
 401                         "read BC version error=%d, buf=%*phC\n",
 402                         error, (int)sizeof(resp), resp);
 403                 return error;
 404         }
 405
 406         version = elants_i2c_parse_version(resp);
 407         ts->bc_version = version >> 8;
 408         ts->iap_version = version & 0xff;
 409
 410         return 0;
 411 }
 412
 413 static int elants_i2c_query_ts_info(struct elants_data *ts)
 414 {
 415         struct i2c_client *client = ts->client;
 416         int error;
 417         u8 resp[17];
 418         u16 phy_x, phy_y, rows, cols, osr;
 419         const u8 get_resolution_cmd[] = {
 420                 CMD_HEADER_6B_READ, 0x00, 0x00, 0x00, 0x00, 0x00
 421         };
 422         const u8 get_osr_cmd[] = {
 423                 CMD_HEADER_READ, E_INFO_OSR, 0x00, 0x01
 424         };
 425         const u8 get_physical_scan_cmd[] = {
 426                 CMD_HEADER_READ, E_INFO_PHY_SCAN, 0x00, 0x01
 427         };
 428         const u8 get_physical_drive_cmd[] = {
 429                 CMD_HEADER_READ, E_INFO_PHY_DRIVER, 0x00, 0x01
 430         };
 431
 432         /* Get trace number */
 433         error = elants_i2c_execute_command(client,
 434                                            get_resolution_cmd,
 435                                            sizeof(get_resolution_cmd),
 436                                            resp, sizeof(resp));
 437         if (error) {
 438                 dev_err(&client->dev, "get resolution command failed: %d\n",
 439                         error);
 440                 return error;
 441         }
 442
 443         rows = resp[2] + resp[6] + resp[10];
 444         cols = resp[3] + resp[7] + resp[11];
 445
 446         /* Process mm_to_pixel information */
 447         error = elants_i2c_execute_command(client,
 448                                            get_osr_cmd, sizeof(get_osr_cmd),
 449                                            resp, sizeof(resp));
 450         if (error) {
 451                 dev_err(&client->dev, "get osr command failed: %d\n",
 452                         error);
 453                 return error;
 454         }
 455
 456         osr = resp[3];
 457
 458         error = elants_i2c_execute_command(client,
 459                                            get_physical_scan_cmd,
 460                                            sizeof(get_physical_scan_cmd),
 461                                            resp, sizeof(resp));
 462         if (error) {
 463                 dev_err(&client->dev, "get physical scan command failed: %d\n",
 464                         error);
 465                 return error;
 466         }
 467
 468         phy_x = get_unaligned_be16(&resp[2]);
 469
 470         error = elants_i2c_execute_command(client,
 471                                            get_physical_drive_cmd,
 472                                            sizeof(get_physical_drive_cmd),
 473                                            resp, sizeof(resp));
 474         if (error) {
 475                 dev_err(&client->dev, "get physical drive command failed: %d\n",
 476                         error);
 477                 return error;
 478         }
 479
 480         phy_y = get_unaligned_be16(&resp[2]);
 481
 482         dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y);
 483
 484         if (rows == 0 || cols == 0 || osr == 0) {
 485                 dev_warn(&client->dev,
 486                          "invalid trace number data: %d, %d, %d\n",
 487                          rows, cols, osr);
 488         } else {
 489                 /* translate trace number to TS resolution */
 490                 ts->x_max = ELAN_TS_RESOLUTION(rows, osr);
 491                 ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x);
 492                 ts->y_max = ELAN_TS_RESOLUTION(cols, osr);
 493                 ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y);
 494         }
 495
 496         return 0;
 497 }
 498
 499 static int elants_i2c_fastboot(struct i2c_client *client)
 500 {
 501         const u8 boot_cmd[] = { 0x4D, 0x61, 0x69, 0x6E };
 502         int error;
 503
 504         error = elants_i2c_send(client, boot_cmd, sizeof(boot_cmd));
 505         if (error) {
 506                 dev_err(&client->dev, "boot failed: %d\n", error);
 507                 return error;
 508         }
 509
 510         dev_dbg(&client->dev, "boot success -- 0x%x\n", client->addr);
 511         return 0;
 512 }
 513
 514 static int elants_i2c_initialize(struct elants_data *ts)
 515 {
 516         struct i2c_client *client = ts->client;
 517         int error, error2, retry_cnt;
 518         const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 };
 519         const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 };
 520         u8 buf[HEADER_SIZE];
 521
 522         for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
 523                 error = elants_i2c_sw_reset(client);
 524                 if (error) {
 525                         /* Continue initializing if it's the last try */
 526                         if (retry_cnt < MAX_RETRIES - 1)
 527                                 continue;
 528                 }
 529
 530                 error = elants_i2c_fastboot(client);
 531                 if (error) {
 532                         /* Continue initializing if it's the last try */
 533                         if (retry_cnt < MAX_RETRIES - 1)
 534                                 continue;
 535                 }
 536
 537                 /* Wait for Hello packet */
 538                 msleep(BOOT_TIME_DELAY_MS);
 539
 540                 error = elants_i2c_read(client, buf, sizeof(buf));
 541                 if (error) {
 542                         dev_err(&client->dev,
 543                                 "failed to read 'hello' packet: %d\n", error);
 544                 } else if (!memcmp(buf, hello_packet, sizeof(hello_packet))) {
 545                         ts->iap_mode = ELAN_IAP_OPERATIONAL;
 546                         break;
 547                 } else if (!memcmp(buf, recov_packet, sizeof(recov_packet))) {
 548                         /*
 549                          * Setting error code will mark device
 550                          * in recovery mode below.
 551                          */
 552                         error = -EIO;
 553                         break;
 554                 } else {
 555                         error = -EINVAL;
 556                         dev_err(&client->dev,
 557                                 "invalid 'hello' packet: %*ph\n",
 558                                 (int)sizeof(buf), buf);
 559                 }
 560         }
 561
 562         /* hw version is available even if device in recovery state */
 563         error2 = elants_i2c_query_hw_version(ts);
 564         if (!error)
 565                 error = error2;
 566
 567         if (!error)
 568                 error = elants_i2c_query_fw_version(ts);
 569         if (!error)
 570                 error = elants_i2c_query_test_version(ts);
 571         if (!error)
 572                 error = elants_i2c_query_bc_version(ts);
 573         if (!error)
 574                 error = elants_i2c_query_ts_info(ts);
 575
 576         if (error)
 577                 ts->iap_mode = ELAN_IAP_RECOVERY;
 578
 579         return 0;
 580 }
 581
 582 /*
 583  * Firmware update interface.
 584  */
 585
 586 static int elants_i2c_fw_write_page(struct i2c_client *client,
 587                                     const void *page)
 588 {
 589         const u8 ack_ok[] = { 0xaa, 0xaa };
 590         u8 buf[2];
 591         int retry;
 592         int error;
 593
 594         for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) {
 595                 error = elants_i2c_send(client, page, ELAN_FW_PAGESIZE);
 596                 if (error) {
 597                         dev_err(&client->dev,
 598                                 "IAP Write Page failed: %d\n", error);
 599                         continue;
 600                 }
 601
 602                 error = elants_i2c_read(client, buf, 2);
 603                 if (error) {
 604                         dev_err(&client->dev,
 605                                 "IAP Ack read failed: %d\n", error);
 606                         return error;
 607                 }
 608
 609                 if (!memcmp(buf, ack_ok, sizeof(ack_ok)))
 610                         return 0;
 611
 612                 error = -EIO;
 613                 dev_err(&client->dev,
 614                         "IAP Get Ack Error [%02x:%02x]\n",
 615                         buf[0], buf[1]);
 616         }
 617
 618         return error;
 619 }
 620
 621 static int elants_i2c_do_update_firmware(struct i2c_client *client,
 622                                          const struct firmware *fw,
 623                                          bool force)
 624 {
 625         const u8 enter_iap[] = { 0x45, 0x49, 0x41, 0x50 };
 626         const u8 enter_iap2[] = { 0x54, 0x00, 0x12, 0x34 };
 627         const u8 iap_ack[] = { 0x55, 0xaa, 0x33, 0xcc };
 628         const u8 close_idle[] = {0x54, 0x2c, 0x01, 0x01};
 629         u8 buf[HEADER_SIZE];
 630         u16 send_id;
 631         int page, n_fw_pages;
 632         int error;
 633
 634         /* Recovery mode detection! */
 635         if (force) {
 636                 dev_dbg(&client->dev, "Recovery mode procedure\n");
 637                 error = elants_i2c_send(client, enter_iap2, sizeof(enter_iap2));
 638         } else {
 639                 /* Start IAP Procedure */
 640                 dev_dbg(&client->dev, "Normal IAP procedure\n");
 641                 /* Close idle mode */
 642                 error = elants_i2c_send(client, close_idle, sizeof(close_idle));
 643                 if (error)
 644                         dev_err(&client->dev, "Failed close idle: %d\n", error);
 645                 msleep(60);
 646                 elants_i2c_sw_reset(client);
 647                 msleep(20);
 648                 error = elants_i2c_send(client, enter_iap, sizeof(enter_iap));
 649         }
 650
 651         if (error) {
 652                 dev_err(&client->dev, "failed to enter IAP mode: %d\n", error);
 653                 return error;
 654         }
 655
 656         msleep(20);
 657
 658         /* check IAP state */
 659         error = elants_i2c_read(client, buf, 4);
 660         if (error) {
 661                 dev_err(&client->dev,
 662                         "failed to read IAP acknowledgement: %d\n",
 663                         error);
 664                 return error;
 665         }
 666
 667         if (memcmp(buf, iap_ack, sizeof(iap_ack))) {
 668                 dev_err(&client->dev,
 669                         "failed to enter IAP: %*ph (expected %*ph)\n",
 670                         (int)sizeof(buf), buf, (int)sizeof(iap_ack), iap_ack);
 671                 return -EIO;
 672         }
 673
 674         dev_info(&client->dev, "successfully entered IAP mode");
 675
 676         send_id = client->addr;
 677         error = elants_i2c_send(client, &send_id, 1);
 678         if (error) {
 679                 dev_err(&client->dev, "sending dummy byte failed: %d\n",
 680                         error);
 681                 return error;
 682         }
 683
 684         /* Clear the last page of Master */
 685         error = elants_i2c_send(client, fw->data, ELAN_FW_PAGESIZE);
 686         if (error) {
 687                 dev_err(&client->dev, "clearing of the last page failed: %d\n",
 688                         error);
 689                 return error;
 690         }
 691
 692         error = elants_i2c_read(client, buf, 2);
 693         if (error) {
 694                 dev_err(&client->dev,
 695                         "failed to read ACK for clearing the last page: %d\n",
 696                         error);
 697                 return error;
 698         }
 699
 700         n_fw_pages = fw->size / ELAN_FW_PAGESIZE;
 701         dev_dbg(&client->dev, "IAP Pages = %d\n", n_fw_pages);
 702
 703         for (page = 0; page < n_fw_pages; page++) {
 704                 error = elants_i2c_fw_write_page(client,
 705                                         fw->data + page * ELAN_FW_PAGESIZE);
 706                 if (error) {
 707                         dev_err(&client->dev,
 708                                 "failed to write FW page %d: %d\n",
 709                                 page, error);
 710                         return error;
 711                 }
 712         }
 713
 714         /* Old iap needs to wait 200ms for WDT and rest is for hello packets */
 715         msleep(300);
 716
 717         dev_info(&client->dev, "firmware update completed\n");
 718         return 0;
 719 }
 720
 721 static int elants_i2c_fw_update(struct elants_data *ts)
 722 {
 723         struct i2c_client *client = ts->client;
 724         const struct firmware *fw;
 725         char *fw_name;
 726         int error;
 727
 728         fw_name = kasprintf(GFP_KERNEL, "/*(DEBLOBBED)*/", ts->hw_version);
 729         if (!fw_name)
 730                 return -ENOMEM;
 731
 732         dev_info(&client->dev, "requesting fw name = %s\n", fw_name);
 733         error = reject_firmware(&fw, fw_name, &client->dev);
 734         kfree(fw_name);
 735         if (error) {
 736                 dev_err(&client->dev, "failed to request firmware: %d\n",
 737                         error);
 738                 return error;
 739         }
 740
 741         if (fw->size % ELAN_FW_PAGESIZE) {
 742                 dev_err(&client->dev, "invalid firmware length: %zu\n",
 743                         fw->size);
 744                 error = -EINVAL;
 745                 goto out;
 746         }
 747
 748         disable_irq(client->irq);
 749
 750         error = elants_i2c_do_update_firmware(client, fw,
 751                                         ts->iap_mode == ELAN_IAP_RECOVERY);
 752         if (error) {
 753                 dev_err(&client->dev, "firmware update failed: %d\n", error);
 754                 ts->iap_mode = ELAN_IAP_RECOVERY;
 755                 goto out_enable_irq;
 756         }
 757
 758         error = elants_i2c_initialize(ts);
 759         if (error) {
 760                 dev_err(&client->dev,
 761                         "failed to initialize device after firmware update: %d\n",
 762                         error);
 763                 ts->iap_mode = ELAN_IAP_RECOVERY;
 764                 goto out_enable_irq;
 765         }
 766
 767         ts->iap_mode = ELAN_IAP_OPERATIONAL;
 768
 769 out_enable_irq:
 770         ts->state = ELAN_STATE_NORMAL;
 771         enable_irq(client->irq);
 772         msleep(100);
 773
 774         if (!error)
 775                 elants_i2c_calibrate(ts);
 776 out:
 777         release_firmware(fw);
 778         return error;
 779 }
 780
 781 /*
 782  * Event reporting.
 783  */
 784
 785 static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf)
 786 {
 787         struct input_dev *input = ts->input;
 788         unsigned int n_fingers;
 789         u16 finger_state;
 790         int i;
 791
 792         n_fingers = buf[FW_POS_STATE + 1] & 0x0f;
 793         finger_state = ((buf[FW_POS_STATE + 1] & 0x30) << 4) |
 794                         buf[FW_POS_STATE];
 795
 796         dev_dbg(&ts->client->dev,
 797                 "n_fingers: %u, state: %04x\n",  n_fingers, finger_state);
 798
 799         for (i = 0; i < MAX_CONTACT_NUM && n_fingers; i++) {
 800                 if (finger_state & 1) {
 801                         unsigned int x, y, p, w;
 802                         u8 *pos;
 803
 804                         pos = &buf[FW_POS_XY + i * 3];
 805                         x = (((u16)pos[0] & 0xf0) << 4) | pos[1];
 806                         y = (((u16)pos[0] & 0x0f) << 8) | pos[2];
 807                         p = buf[FW_POS_PRESSURE + i];
 808                         w = buf[FW_POS_WIDTH + i];
 809
 810                         dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n",
 811                                 i, x, y, p, w);
 812
 813                         input_mt_slot(input, i);
 814                         input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
 815                         input_event(input, EV_ABS, ABS_MT_POSITION_X, x);
 816                         input_event(input, EV_ABS, ABS_MT_POSITION_Y, y);
 817                         input_event(input, EV_ABS, ABS_MT_PRESSURE, p);
 818                         input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w);
 819
 820                         n_fingers--;
 821                 }
 822
 823                 finger_state >>= 1;
 824         }
 825
 826         input_mt_sync_frame(input);
 827         input_sync(input);
 828 }
 829
 830 static u8 elants_i2c_calculate_checksum(u8 *buf)
 831 {
 832         u8 checksum = 0;
 833         u8 i;
 834
 835         for (i = 0; i < FW_POS_CHECKSUM; i++)
 836                 checksum += buf[i];
 837
 838         return checksum;
 839 }
 840
 841 static void elants_i2c_event(struct elants_data *ts, u8 *buf)
 842 {
 843         u8 checksum = elants_i2c_calculate_checksum(buf);
 844
 845         if (unlikely(buf[FW_POS_CHECKSUM] != checksum))
 846                 dev_warn(&ts->client->dev,
 847                          "%s: invalid checksum for packet %02x: %02x vs. %02x\n",
 848                          __func__, buf[FW_POS_HEADER],
 849                          checksum, buf[FW_POS_CHECKSUM]);
 850         else if (unlikely(buf[FW_POS_HEADER] != HEADER_REPORT_10_FINGER))
 851                 dev_warn(&ts->client->dev,
 852                          "%s: unknown packet type: %02x\n",
 853                          __func__, buf[FW_POS_HEADER]);
 854         else
 855                 elants_i2c_mt_event(ts, buf);
 856 }
 857
 858 static irqreturn_t elants_i2c_irq(int irq, void *_dev)
 859 {
 860         const u8 wait_packet[] = { 0x64, 0x64, 0x64, 0x64 };
 861         struct elants_data *ts = _dev;
 862         struct i2c_client *client = ts->client;
 863         int report_count, report_len;
 864         int i;
 865         int len;
 866
 867         len = i2c_master_recv(client, ts->buf, sizeof(ts->buf));
 868         if (len < 0) {
 869                 dev_err(&client->dev, "%s: failed to read data: %d\n",
 870                         __func__, len);
 871                 goto out;
 872         }
 873
 874         dev_dbg(&client->dev, "%s: packet %*ph\n",
 875                 __func__, HEADER_SIZE, ts->buf);
 876
 877         switch (ts->state) {
 878         case ELAN_WAIT_RECALIBRATION:
 879                 if (ts->buf[FW_HDR_TYPE] == CMD_HEADER_REK) {
 880                         memcpy(ts->cmd_resp, ts->buf, sizeof(ts->cmd_resp));
 881                         complete(&ts->cmd_done);
 882                         ts->state = ELAN_STATE_NORMAL;
 883                 }
 884                 break;
 885
 886         case ELAN_WAIT_QUEUE_HEADER:
 887                 if (ts->buf[FW_HDR_TYPE] != QUEUE_HEADER_NORMAL)
 888                         break;
 889
 890                 ts->state = ELAN_STATE_NORMAL;
 891                 /* fall through */
 892
 893         case ELAN_STATE_NORMAL:
 894
 895                 switch (ts->buf[FW_HDR_TYPE]) {
 896                 case CMD_HEADER_HELLO:
 897                 case CMD_HEADER_RESP:
 898                 case CMD_HEADER_REK:
 899                         break;
 900
 901                 case QUEUE_HEADER_WAIT:
 902                         if (memcmp(ts->buf, wait_packet, sizeof(wait_packet))) {
 903                                 dev_err(&client->dev,
 904                                         "invalid wait packet %*ph\n",
 905                                         HEADER_SIZE, ts->buf);
 906                         } else {
 907                                 ts->state = ELAN_WAIT_QUEUE_HEADER;
 908                                 udelay(30);
 909                         }
 910                         break;
 911
 912                 case QUEUE_HEADER_SINGLE:
 913                         elants_i2c_event(ts, &ts->buf[HEADER_SIZE]);
 914                         break;
 915
 916                 case QUEUE_HEADER_NORMAL:
 917                         report_count = ts->buf[FW_HDR_COUNT];
 918                         if (report_count == 0 || report_count > 3) {
 919                                 dev_err(&client->dev,
 920                                         "bad report count: %*ph\n",
 921                                         HEADER_SIZE, ts->buf);
 922                                 break;
 923                         }
 924
 925                         report_len = ts->buf[FW_HDR_LENGTH] / report_count;
 926                         if (report_len != PACKET_SIZE) {
 927                                 dev_err(&client->dev,
 928                                         "mismatching report length: %*ph\n",
 929                                         HEADER_SIZE, ts->buf);
 930                                 break;
 931                         }
 932
 933                         for (i = 0; i < report_count; i++) {
 934                                 u8 *buf = ts->buf + HEADER_SIZE +
 935                                                         i * PACKET_SIZE;
 936                                 elants_i2c_event(ts, buf);
 937                         }
 938                         break;
 939
 940                 default:
 941                         dev_err(&client->dev, "unknown packet %*ph\n",
 942                                 HEADER_SIZE, ts->buf);
 943                         break;
 944                 }
 945                 break;
 946         }
 947
 948 out:
 949         return IRQ_HANDLED;
 950 }
 951
 952 /*
 953  * sysfs interface
 954  */
 955 static ssize_t calibrate_store(struct device *dev,
 956                                struct device_attribute *attr,
 957                               const char *buf, size_t count)
 958 {
 959         struct i2c_client *client = to_i2c_client(dev);
 960         struct elants_data *ts = i2c_get_clientdata(client);
 961         int error;
 962
 963         error = mutex_lock_interruptible(&ts->sysfs_mutex);
 964         if (error)
 965                 return error;
 966
 967         error = elants_i2c_calibrate(ts);
 968
 969         mutex_unlock(&ts->sysfs_mutex);
 970         return error ?: count;
 971 }
 972
 973 static ssize_t write_update_fw(struct device *dev,
 974                                struct device_attribute *attr,
 975                                const char *buf, size_t count)
 976 {
 977         struct i2c_client *client = to_i2c_client(dev);
 978         struct elants_data *ts = i2c_get_clientdata(client);
 979         int error;
 980
 981         error = mutex_lock_interruptible(&ts->sysfs_mutex);
 982         if (error)
 983                 return error;
 984
 985         error = elants_i2c_fw_update(ts);
 986         dev_dbg(dev, "firmware update result: %d\n", error);
 987
 988         mutex_unlock(&ts->sysfs_mutex);
 989         return error ?: count;
 990 }
 991
 992 static ssize_t show_iap_mode(struct device *dev,
 993                              struct device_attribute *attr, char *buf)
 994 {
 995         struct i2c_client *client = to_i2c_client(dev);
 996         struct elants_data *ts = i2c_get_clientdata(client);
 997
 998         return sprintf(buf, "%s\n",
 999                        ts->iap_mode == ELAN_IAP_OPERATIONAL ?
1000                                 "Normal" : "Recovery");
1001 }
1002
1003 static DEVICE_ATTR(calibrate, S_IWUSR, NULL, calibrate_store);
1004 static DEVICE_ATTR(iap_mode, S_IRUGO, show_iap_mode, NULL);
1005 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw);
1006
1007 struct elants_version_attribute {
1008         struct device_attribute dattr;
1009         size_t field_offset;
1010         size_t field_size;
1011 };
1012
1013 #define __ELANTS_FIELD_SIZE(_field)                                     \
1014         sizeof(((struct elants_data *)NULL)->_field)
1015 #define __ELANTS_VERIFY_SIZE(_field)                                    \
1016         (BUILD_BUG_ON_ZERO(__ELANTS_FIELD_SIZE(_field) > 2) +           \
1017          __ELANTS_FIELD_SIZE(_field))
1018 #define ELANTS_VERSION_ATTR(_field)                                     \
1019         struct elants_version_attribute elants_ver_attr_##_field = {    \
1020                 .dattr = __ATTR(_field, S_IRUGO,                        \
1021                                 elants_version_attribute_show, NULL),   \
1022                 .field_offset = offsetof(struct elants_data, _field),   \
1023                 .field_size = __ELANTS_VERIFY_SIZE(_field),             \
1024         }
1025
1026 static ssize_t elants_version_attribute_show(struct device *dev,
1027                                              struct device_attribute *dattr,
1028                                              char *buf)
1029 {
1030         struct i2c_client *client = to_i2c_client(dev);
1031         struct elants_data *ts = i2c_get_clientdata(client);
1032         struct elants_version_attribute *attr =
1033                 container_of(dattr, struct elants_version_attribute, dattr);
1034         u8 *field = (u8 *)((char *)ts + attr->field_offset);
1035         unsigned int fmt_size;
1036         unsigned int val;
1037
1038         if (attr->field_size == 1) {
1039                 val = *field;
1040                 fmt_size = 2; /* 2 HEX digits */
1041         } else {
1042                 val = *(u16 *)field;
1043                 fmt_size = 4; /* 4 HEX digits */
1044         }
1045
1046         return sprintf(buf, "%0*x\n", fmt_size, val);
1047 }
1048
1049 static ELANTS_VERSION_ATTR(fw_version);
1050 static ELANTS_VERSION_ATTR(hw_version);
1051 static ELANTS_VERSION_ATTR(test_version);
1052 static ELANTS_VERSION_ATTR(solution_version);
1053 static ELANTS_VERSION_ATTR(bc_version);
1054 static ELANTS_VERSION_ATTR(iap_version);
1055
1056 static struct attribute *elants_attributes[] = {
1057         &dev_attr_calibrate.attr,
1058         &dev_attr_update_fw.attr,
1059         &dev_attr_iap_mode.attr,
1060
1061         &elants_ver_attr_fw_version.dattr.attr,
1062         &elants_ver_attr_hw_version.dattr.attr,
1063         &elants_ver_attr_test_version.dattr.attr,
1064         &elants_ver_attr_solution_version.dattr.attr,
1065         &elants_ver_attr_bc_version.dattr.attr,
1066         &elants_ver_attr_iap_version.dattr.attr,
1067         NULL
1068 };
1069
1070 static const struct attribute_group elants_attribute_group = {
1071         .attrs = elants_attributes,
1072 };
1073
1074 static void elants_i2c_remove_sysfs_group(void *_data)
1075 {
1076         struct elants_data *ts = _data;
1077
1078         sysfs_remove_group(&ts->client->dev.kobj, &elants_attribute_group);
1079 }
1080
1081 static int elants_i2c_power_on(struct elants_data *ts)
1082 {
1083         int error;
1084
1085         /*
1086          * If we do not have reset gpio assume platform firmware
1087          * controls regulators and does power them on for us.
1088          */
1089         if (IS_ERR_OR_NULL(ts->reset_gpio))
1090                 return 0;
1091
1092         gpiod_set_value_cansleep(ts->reset_gpio, 1);
1093
1094         error = regulator_enable(ts->vcc33);
1095         if (error) {
1096                 dev_err(&ts->client->dev,
1097                         "failed to enable vcc33 regulator: %d\n",
1098                         error);
1099                 goto release_reset_gpio;
1100         }
1101
1102         error = regulator_enable(ts->vccio);
1103         if (error) {
1104                 dev_err(&ts->client->dev,
1105                         "failed to enable vccio regulator: %d\n",
1106                         error);
1107                 regulator_disable(ts->vcc33);
1108                 goto release_reset_gpio;
1109         }
1110
1111         /*
1112          * We need to wait a bit after powering on controller before
1113          * we are allowed to release reset GPIO.
1114          */
1115         udelay(ELAN_POWERON_DELAY_USEC);
1116
1117 release_reset_gpio:
1118         gpiod_set_value_cansleep(ts->reset_gpio, 0);
1119         if (error)
1120                 return error;
1121
1122         msleep(ELAN_RESET_DELAY_MSEC);
1123
1124         return 0;
1125 }
1126
1127 static void elants_i2c_power_off(void *_data)
1128 {
1129         struct elants_data *ts = _data;
1130
1131         if (!IS_ERR_OR_NULL(ts->reset_gpio)) {
1132                 /*
1133                  * Activate reset gpio to prevent leakage through the
1134                  * pin once we shut off power to the controller.
1135                  */
1136                 gpiod_set_value_cansleep(ts->reset_gpio, 1);
1137                 regulator_disable(ts->vccio);
1138                 regulator_disable(ts->vcc33);
1139         }
1140 }
1141
1142 #ifdef CONFIG_ACPI
1143 static const struct acpi_device_id i2c_hid_ids[] = {
1144         {"ACPI0C50", 0 },
1145         {"PNP0C50", 0 },
1146         { },
1147 };
1148
1149 static const guid_t i2c_hid_guid =
1150         GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
1151                   0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
1152
1153 static bool elants_acpi_is_hid_device(struct device *dev)
1154 {
1155         acpi_handle handle = ACPI_HANDLE(dev);
1156         union acpi_object *obj;
1157
1158         if (acpi_match_device_ids(ACPI_COMPANION(dev), i2c_hid_ids))
1159                 return false;
1160
1161         obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL, ACPI_TYPE_INTEGER);
1162         if (obj) {
1163                 ACPI_FREE(obj);
1164                 return true;
1165         }
1166
1167         return false;
1168 }
1169 #else
1170 static bool elants_acpi_is_hid_device(struct device *dev)
1171 {
1172         return false;
1173 }
1174 #endif
1175
1176 static int elants_i2c_probe(struct i2c_client *client,
1177                             const struct i2c_device_id *id)
1178 {
1179         union i2c_smbus_data dummy;
1180         struct elants_data *ts;
1181         unsigned long irqflags;
1182         int error;
1183
1184         /* Don't bind to i2c-hid compatible devices, these are handled by the i2c-hid drv. */
1185         if (elants_acpi_is_hid_device(&client->dev)) {
1186                 dev_warn(&client->dev, "This device appears to be an I2C-HID device, not binding\n");
1187                 return -ENODEV;
1188         }
1189
1190         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1191                 dev_err(&client->dev, "I2C check functionality error\n");
1192                 return -ENXIO;
1193         }
1194
1195         ts = devm_kzalloc(&client->dev, sizeof(struct elants_data), GFP_KERNEL);
1196         if (!ts)
1197                 return -ENOMEM;
1198
1199         mutex_init(&ts->sysfs_mutex);
1200         init_completion(&ts->cmd_done);
1201
1202         ts->client = client;
1203         i2c_set_clientdata(client, ts);
1204
1205         ts->vcc33 = devm_regulator_get(&client->dev, "vcc33");
1206         if (IS_ERR(ts->vcc33)) {
1207                 error = PTR_ERR(ts->vcc33);
1208                 if (error != -EPROBE_DEFER)
1209                         dev_err(&client->dev,
1210                                 "Failed to get 'vcc33' regulator: %d\n",
1211                                 error);
1212                 return error;
1213         }
1214
1215         ts->vccio = devm_regulator_get(&client->dev, "vccio");
1216         if (IS_ERR(ts->vccio)) {
1217                 error = PTR_ERR(ts->vccio);
1218                 if (error != -EPROBE_DEFER)
1219                         dev_err(&client->dev,
1220                                 "Failed to get 'vccio' regulator: %d\n",
1221                                 error);
1222                 return error;
1223         }
1224
1225         ts->reset_gpio = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW);
1226         if (IS_ERR(ts->reset_gpio)) {
1227                 error = PTR_ERR(ts->reset_gpio);
1228
1229                 if (error == -EPROBE_DEFER)
1230                         return error;
1231
1232                 if (error != -ENOENT && error != -ENOSYS) {
1233                         dev_err(&client->dev,
1234                                 "failed to get reset gpio: %d\n",
1235                                 error);
1236                         return error;
1237                 }
1238
1239                 ts->keep_power_in_suspend = true;
1240         }
1241
1242         error = elants_i2c_power_on(ts);
1243         if (error)
1244                 return error;
1245
1246         error = devm_add_action(&client->dev, elants_i2c_power_off, ts);
1247         if (error) {
1248                 dev_err(&client->dev,
1249                         "failed to install power off action: %d\n", error);
1250                 elants_i2c_power_off(ts);
1251                 return error;
1252         }
1253
1254         /* Make sure there is something at this address */
1255         if (i2c_smbus_xfer(client->adapter, client->addr, 0,
1256                            I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) {
1257                 dev_err(&client->dev, "nothing at this address\n");
1258                 return -ENXIO;
1259         }
1260
1261         error = elants_i2c_initialize(ts);
1262         if (error) {
1263                 dev_err(&client->dev, "failed to initialize: %d\n", error);
1264                 return error;
1265         }
1266
1267         ts->input = devm_input_allocate_device(&client->dev);
1268         if (!ts->input) {
1269                 dev_err(&client->dev, "Failed to allocate input device\n");
1270                 return -ENOMEM;
1271         }
1272
1273         ts->input->name = "Elan Touchscreen";
1274         ts->input->id.bustype = BUS_I2C;
1275
1276         __set_bit(BTN_TOUCH, ts->input->keybit);
1277         __set_bit(EV_ABS, ts->input->evbit);
1278         __set_bit(EV_KEY, ts->input->evbit);
1279
1280         /* Single touch input params setup */
1281         input_set_abs_params(ts->input, ABS_X, 0, ts->x_max, 0, 0);
1282         input_set_abs_params(ts->input, ABS_Y, 0, ts->y_max, 0, 0);
1283         input_set_abs_params(ts->input, ABS_PRESSURE, 0, 255, 0, 0);
1284         input_abs_set_res(ts->input, ABS_X, ts->x_res);
1285         input_abs_set_res(ts->input, ABS_Y, ts->y_res);
1286
1287         /* Multitouch input params setup */
1288         error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM,
1289                                     INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
1290         if (error) {
1291                 dev_err(&client->dev,
1292                         "failed to initialize MT slots: %d\n", error);
1293                 return error;
1294         }
1295
1296         input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0);
1297         input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0);
1298         input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
1299         input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
1300         input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res);
1301         input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res);
1302
1303         error = input_register_device(ts->input);
1304         if (error) {
1305                 dev_err(&client->dev,
1306                         "unable to register input device: %d\n", error);
1307                 return error;
1308         }
1309
1310         /*
1311          * Systems using device tree should set up interrupt via DTS,
1312          * the rest will use the default falling edge interrupts.
1313          */
1314         irqflags = client->dev.of_node ? 0 : IRQF_TRIGGER_FALLING;
1315
1316         error = devm_request_threaded_irq(&client->dev, client->irq,
1317                                           NULL, elants_i2c_irq,
1318                                           irqflags | IRQF_ONESHOT,
1319                                           client->name, ts);
1320         if (error) {
1321                 dev_err(&client->dev, "Failed to register interrupt\n");
1322                 return error;
1323         }
1324
1325         /*
1326          * Systems using device tree should set up wakeup via DTS,
1327          * the rest will configure device as wakeup source by default.
1328          */
1329         if (!client->dev.of_node)
1330                 device_init_wakeup(&client->dev, true);
1331
1332         error = sysfs_create_group(&client->dev.kobj, &elants_attribute_group);
1333         if (error) {
1334                 dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
1335                         error);
1336                 return error;
1337         }
1338
1339         error = devm_add_action(&client->dev,
1340                                 elants_i2c_remove_sysfs_group, ts);
1341         if (error) {
1342                 elants_i2c_remove_sysfs_group(ts);
1343                 dev_err(&client->dev,
1344                         "Failed to add sysfs cleanup action: %d\n",
1345                         error);
1346                 return error;
1347         }
1348
1349         return 0;
1350 }
1351
1352 static int __maybe_unused elants_i2c_suspend(struct device *dev)
1353 {
1354         struct i2c_client *client = to_i2c_client(dev);
1355         struct elants_data *ts = i2c_get_clientdata(client);
1356         const u8 set_sleep_cmd[] = { 0x54, 0x50, 0x00, 0x01 };
1357         int retry_cnt;
1358         int error;
1359
1360         /* Command not support in IAP recovery mode */
1361         if (ts->iap_mode != ELAN_IAP_OPERATIONAL)
1362                 return -EBUSY;
1363
1364         disable_irq(client->irq);
1365
1366         if (device_may_wakeup(dev)) {
1367                 /*
1368                  * The device will automatically enter idle mode
1369                  * that has reduced power consumption.
1370                  */
1371                 ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0);
1372         } else if (ts->keep_power_in_suspend) {
1373                 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
1374                         error = elants_i2c_send(client, set_sleep_cmd,
1375                                                 sizeof(set_sleep_cmd));
1376                         if (!error)
1377                                 break;
1378
1379                         dev_err(&client->dev,
1380                                 "suspend command failed: %d\n", error);
1381                 }
1382         } else {
1383                 elants_i2c_power_off(ts);
1384         }
1385
1386         return 0;
1387 }
1388
1389 static int __maybe_unused elants_i2c_resume(struct device *dev)
1390 {
1391         struct i2c_client *client = to_i2c_client(dev);
1392         struct elants_data *ts = i2c_get_clientdata(client);
1393         const u8 set_active_cmd[] = { 0x54, 0x58, 0x00, 0x01 };
1394         int retry_cnt;
1395         int error;
1396
1397         if (device_may_wakeup(dev)) {
1398                 if (ts->wake_irq_enabled)
1399                         disable_irq_wake(client->irq);
1400                 elants_i2c_sw_reset(client);
1401         } else if (ts->keep_power_in_suspend) {
1402                 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
1403                         error = elants_i2c_send(client, set_active_cmd,
1404                                                 sizeof(set_active_cmd));
1405                         if (!error)
1406                                 break;
1407
1408                         dev_err(&client->dev,
1409                                 "resume command failed: %d\n", error);
1410                 }
1411         } else {
1412                 elants_i2c_power_on(ts);
1413                 elants_i2c_initialize(ts);
1414         }
1415
1416         ts->state = ELAN_STATE_NORMAL;
1417         enable_irq(client->irq);
1418
1419         return 0;
1420 }
1421
1422 static SIMPLE_DEV_PM_OPS(elants_i2c_pm_ops,
1423                          elants_i2c_suspend, elants_i2c_resume);
1424
1425 static const struct i2c_device_id elants_i2c_id[] = {
1426         { DEVICE_NAME, 0 },
1427         { }
1428 };
1429 MODULE_DEVICE_TABLE(i2c, elants_i2c_id);
1430
1431 #ifdef CONFIG_ACPI
1432 static const struct acpi_device_id elants_acpi_id[] = {
1433         { "ELAN0001", 0 },
1434         { }
1435 };
1436 MODULE_DEVICE_TABLE(acpi, elants_acpi_id);
1437 #endif
1438
1439 #ifdef CONFIG_OF
1440 static const struct of_device_id elants_of_match[] = {
1441         { .compatible = "elan,ekth3500" },
1442         { /* sentinel */ }
1443 };
1444 MODULE_DEVICE_TABLE(of, elants_of_match);
1445 #endif
1446
1447 static struct i2c_driver elants_i2c_driver = {
1448         .probe = elants_i2c_probe,
1449         .id_table = elants_i2c_id,
1450         .driver = {
1451                 .name = DEVICE_NAME,
1452                 .pm = &elants_i2c_pm_ops,
1453                 .acpi_match_table = ACPI_PTR(elants_acpi_id),
1454                 .of_match_table = of_match_ptr(elants_of_match),
1455                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1456         },
1457 };
1458 module_i2c_driver(elants_i2c_driver);
1459
1460 MODULE_AUTHOR("Scott Liu <scott.liu@emc.com.tw>");
1461 MODULE_DESCRIPTION("Elan I2c Touchscreen driver");
1462 MODULE_VERSION(DRV_VERSION);
1463 MODULE_LICENSE("GPL");