drivers/input/touchscreen/elants_i2c.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Elan Microelectronics touch panels with I2C interface
   4  *
   5  * Copyright (C) 2014 Elan Microelectronics Corporation.
   6  * Scott Liu <scott.liu@emc.com.tw>
   7  *
   8  * This code is partly based on hid-multitouch.c:
   9  *
  10  *  Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
  11  *  Copyright (c) 2010-2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
  12  *  Copyright (c) 2010-2012 Ecole Nationale de l'Aviation Civile, France
  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 #include <linux/bits.h>
  23 #include <linux/module.h>
  24 #include <linux/input.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/irq.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/async.h>
  29 #include <linux/i2c.h>
  30 #include <linux/delay.h>
  31 #include <linux/uaccess.h>
  32 #include <linux/buffer_head.h>
  33 #include <linux/slab.h>
  34 #include <linux/firmware.h>
  35 #include <linux/input/mt.h>
  36 #include <linux/input/touchscreen.h>
  37 #include <linux/acpi.h>
  38 #include <linux/of.h>
  39 #include <linux/pm_wakeirq.h>
  40 #include <linux/gpio/consumer.h>
  41 #include <linux/regulator/consumer.h>
  42 #include <linux/uuid.h>
  43 #include <asm/unaligned.h>
  44
  45 /* Device, Driver information */
  46 #define DEVICE_NAME     "elants_i2c"
  47
  48 /* Convert from rows or columns into resolution */
  49 #define ELAN_TS_RESOLUTION(n, m)   (((n) - 1) * (m))
  50
  51 /* FW header data */
  52 #define HEADER_SIZE             4
  53 #define FW_HDR_TYPE             0
  54 #define FW_HDR_COUNT            1
  55 #define FW_HDR_LENGTH           2
  56
  57 /* Buffer mode Queue Header information */
  58 #define QUEUE_HEADER_SINGLE     0x62
  59 #define QUEUE_HEADER_NORMAL     0X63
  60 #define QUEUE_HEADER_WAIT       0x64
  61 #define QUEUE_HEADER_NORMAL2    0x66
  62
  63 /* Command header definition */
  64 #define CMD_HEADER_WRITE        0x54
  65 #define CMD_HEADER_READ         0x53
  66 #define CMD_HEADER_6B_READ      0x5B
  67 #define CMD_HEADER_ROM_READ     0x96
  68 #define CMD_HEADER_RESP         0x52
  69 #define CMD_HEADER_6B_RESP      0x9B
  70 #define CMD_HEADER_ROM_RESP     0x95
  71 #define CMD_HEADER_HELLO        0x55
  72 #define CMD_HEADER_REK          0x66
  73
  74 /* FW position data */
  75 #define PACKET_SIZE_OLD         40
  76 #define PACKET_SIZE             55
  77 #define MAX_CONTACT_NUM         10
  78 #define FW_POS_HEADER           0
  79 #define FW_POS_STATE            1
  80 #define FW_POS_TOTAL            2
  81 #define FW_POS_XY               3
  82 #define FW_POS_TOOL_TYPE        33
  83 #define FW_POS_CHECKSUM         34
  84 #define FW_POS_WIDTH            35
  85 #define FW_POS_PRESSURE         45
  86
  87 #define HEADER_REPORT_10_FINGER 0x62
  88
  89 /* Header (4 bytes) plus 3 full 10-finger packets */
  90 #define MAX_PACKET_SIZE         169
  91
  92 #define BOOT_TIME_DELAY_MS      50
  93
  94 /* FW read command, 0x53 0x?? 0x0, 0x01 */
  95 #define E_ELAN_INFO_FW_VER      0x00
  96 #define E_ELAN_INFO_BC_VER      0x10
  97 #define E_ELAN_INFO_X_RES       0x60
  98 #define E_ELAN_INFO_Y_RES       0x63
  99 #define E_ELAN_INFO_REK         0xD0
 100 #define E_ELAN_INFO_TEST_VER    0xE0
 101 #define E_ELAN_INFO_FW_ID       0xF0
 102 #define E_INFO_OSR              0xD6
 103 #define E_INFO_PHY_SCAN         0xD7
 104 #define E_INFO_PHY_DRIVER       0xD8
 105
 106 /* FW write command, 0x54 0x?? 0x0, 0x01 */
 107 #define E_POWER_STATE_SLEEP     0x50
 108 #define E_POWER_STATE_RESUME    0x58
 109
 110 #define MAX_RETRIES             3
 111 #define MAX_FW_UPDATE_RETRIES   30
 112
 113 #define ELAN_FW_PAGESIZE        132
 114
 115 /* calibration timeout definition */
 116 #define ELAN_CALI_TIMEOUT_MSEC  12000
 117
 118 #define ELAN_POWERON_DELAY_USEC 5000
 119 #define ELAN_RESET_DELAY_MSEC   20
 120
 121 /* FW boot code version */
 122 #define BC_VER_H_BYTE_FOR_EKTH3900x1_I2C        0x72
 123 #define BC_VER_H_BYTE_FOR_EKTH3900x2_I2C        0x82
 124 #define BC_VER_H_BYTE_FOR_EKTH3900x3_I2C        0x92
 125 #define BC_VER_H_BYTE_FOR_EKTH5312x1_I2C        0x6D
 126 #define BC_VER_H_BYTE_FOR_EKTH5312x2_I2C        0x6E
 127 #define BC_VER_H_BYTE_FOR_EKTH5312cx1_I2C       0x77
 128 #define BC_VER_H_BYTE_FOR_EKTH5312cx2_I2C       0x78
 129 #define BC_VER_H_BYTE_FOR_EKTH5312x1_I2C_USB    0x67
 130 #define BC_VER_H_BYTE_FOR_EKTH5312x2_I2C_USB    0x68
 131 #define BC_VER_H_BYTE_FOR_EKTH5312cx1_I2C_USB   0x74
 132 #define BC_VER_H_BYTE_FOR_EKTH5312cx2_I2C_USB   0x75
 133
 134 enum elants_chip_id {
 135         EKTH3500,
 136         EKTF3624,
 137 };
 138
 139 enum elants_state {
 140         ELAN_STATE_NORMAL,
 141         ELAN_WAIT_QUEUE_HEADER,
 142         ELAN_WAIT_RECALIBRATION,
 143 };
 144
 145 enum elants_iap_mode {
 146         ELAN_IAP_OPERATIONAL,
 147         ELAN_IAP_RECOVERY,
 148 };
 149
 150 /* struct elants_data - represents state of Elan touchscreen device */
 151 struct elants_data {
 152         struct i2c_client *client;
 153         struct input_dev *input;
 154
 155         struct regulator *vcc33;
 156         struct regulator *vccio;
 157         struct gpio_desc *reset_gpio;
 158
 159         u16 fw_version;
 160         u8 test_version;
 161         u8 solution_version;
 162         u8 bc_version;
 163         u8 iap_version;
 164         u16 hw_version;
 165         u8 major_res;
 166         unsigned int x_res;     /* resolution in units/mm */
 167         unsigned int y_res;
 168         unsigned int x_max;
 169         unsigned int y_max;
 170         unsigned int phy_x;
 171         unsigned int phy_y;
 172         struct touchscreen_properties prop;
 173
 174         enum elants_state state;
 175         enum elants_chip_id chip_id;
 176         enum elants_iap_mode iap_mode;
 177
 178         /* Guards against concurrent access to the device via sysfs */
 179         struct mutex sysfs_mutex;
 180
 181         u8 cmd_resp[HEADER_SIZE];
 182         struct completion cmd_done;
 183
 184         bool keep_power_in_suspend;
 185
 186         /* Must be last to be used for DMA operations */
 187         u8 buf[MAX_PACKET_SIZE] ____cacheline_aligned;
 188 };
 189
 190 static int elants_i2c_send(struct i2c_client *client,
 191                            const void *data, size_t size)
 192 {
 193         int ret;
 194
 195         ret = i2c_master_send(client, data, size);
 196         if (ret == size)
 197                 return 0;
 198
 199         if (ret >= 0)
 200                 ret = -EIO;
 201
 202         dev_err(&client->dev, "%s failed (%*ph): %d\n",
 203                 __func__, (int)size, data, ret);
 204
 205         return ret;
 206 }
 207
 208 static int elants_i2c_read(struct i2c_client *client, void *data, size_t size)
 209 {
 210         int ret;
 211
 212         ret = i2c_master_recv(client, data, size);
 213         if (ret == size)
 214                 return 0;
 215
 216         if (ret >= 0)
 217                 ret = -EIO;
 218
 219         dev_err(&client->dev, "%s failed: %d\n", __func__, ret);
 220
 221         return ret;
 222 }
 223
 224 static int elants_i2c_execute_command(struct i2c_client *client,
 225                                       const u8 *cmd, size_t cmd_size,
 226                                       u8 *resp, size_t resp_size,
 227                                       int retries, const char *cmd_name)
 228 {
 229         struct i2c_msg msgs[2];
 230         int ret;
 231         u8 expected_response;
 232
 233         switch (cmd[0]) {
 234         case CMD_HEADER_READ:
 235                 expected_response = CMD_HEADER_RESP;
 236                 break;
 237
 238         case CMD_HEADER_6B_READ:
 239                 expected_response = CMD_HEADER_6B_RESP;
 240                 break;
 241
 242         case CMD_HEADER_ROM_READ:
 243                 expected_response = CMD_HEADER_ROM_RESP;
 244                 break;
 245
 246         default:
 247                 dev_err(&client->dev, "(%s): invalid command: %*ph\n",
 248                         cmd_name, (int)cmd_size, cmd);
 249                 return -EINVAL;
 250         }
 251
 252         for (;;) {
 253                 msgs[0].addr = client->addr;
 254                 msgs[0].flags = client->flags & I2C_M_TEN;
 255                 msgs[0].len = cmd_size;
 256                 msgs[0].buf = (u8 *)cmd;
 257
 258                 msgs[1].addr = client->addr;
 259                 msgs[1].flags = (client->flags & I2C_M_TEN) | I2C_M_RD;
 260                 msgs[1].flags |= I2C_M_RD;
 261                 msgs[1].len = resp_size;
 262                 msgs[1].buf = resp;
 263
 264                 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
 265                 if (ret < 0) {
 266                         if (--retries > 0) {
 267                                 dev_dbg(&client->dev,
 268                                         "(%s) I2C transfer failed: %pe (retrying)\n",
 269                                         cmd_name, ERR_PTR(ret));
 270                                 continue;
 271                         }
 272
 273                         dev_err(&client->dev,
 274                                 "(%s) I2C transfer failed: %pe\n",
 275                                 cmd_name, ERR_PTR(ret));
 276                         return ret;
 277                 }
 278
 279                 if (ret != ARRAY_SIZE(msgs) ||
 280                     resp[FW_HDR_TYPE] != expected_response) {
 281                         if (--retries > 0) {
 282                                 dev_dbg(&client->dev,
 283                                         "(%s) unexpected response: %*ph (retrying)\n",
 284                                         cmd_name, ret, resp);
 285                                 continue;
 286                         }
 287
 288                         dev_err(&client->dev,
 289                                 "(%s) unexpected response: %*ph\n",
 290                                 cmd_name, ret, resp);
 291                         return -EIO;
 292                 }
 293
 294                 return 0;
 295         }
 296 }
 297
 298 static int elants_i2c_calibrate(struct elants_data *ts)
 299 {
 300         struct i2c_client *client = ts->client;
 301         int ret, error;
 302         static const u8 w_flashkey[] = { CMD_HEADER_WRITE, 0xC0, 0xE1, 0x5A };
 303         static const u8 rek[] = { CMD_HEADER_WRITE, 0x29, 0x00, 0x01 };
 304         static const u8 rek_resp[] = { CMD_HEADER_REK, 0x66, 0x66, 0x66 };
 305
 306         disable_irq(client->irq);
 307
 308         ts->state = ELAN_WAIT_RECALIBRATION;
 309         reinit_completion(&ts->cmd_done);
 310
 311         elants_i2c_send(client, w_flashkey, sizeof(w_flashkey));
 312         elants_i2c_send(client, rek, sizeof(rek));
 313
 314         enable_irq(client->irq);
 315
 316         ret = wait_for_completion_interruptible_timeout(&ts->cmd_done,
 317                                 msecs_to_jiffies(ELAN_CALI_TIMEOUT_MSEC));
 318
 319         ts->state = ELAN_STATE_NORMAL;
 320
 321         if (ret <= 0) {
 322                 error = ret < 0 ? ret : -ETIMEDOUT;
 323                 dev_err(&client->dev,
 324                         "error while waiting for calibration to complete: %d\n",
 325                         error);
 326                 return error;
 327         }
 328
 329         if (memcmp(rek_resp, ts->cmd_resp, sizeof(rek_resp))) {
 330                 dev_err(&client->dev,
 331                         "unexpected calibration response: %*ph\n",
 332                         (int)sizeof(ts->cmd_resp), ts->cmd_resp);
 333                 return -EINVAL;
 334         }
 335
 336         return 0;
 337 }
 338
 339 static int elants_i2c_sw_reset(struct i2c_client *client)
 340 {
 341         const u8 soft_rst_cmd[] = { 0x77, 0x77, 0x77, 0x77 };
 342         int error;
 343
 344         error = elants_i2c_send(client, soft_rst_cmd,
 345                                 sizeof(soft_rst_cmd));
 346         if (error) {
 347                 dev_err(&client->dev, "software reset failed: %d\n", error);
 348                 return error;
 349         }
 350
 351         /*
 352          * We should wait at least 10 msec (but no more than 40) before
 353          * sending fastboot or IAP command to the device.
 354          */
 355         msleep(30);
 356
 357         return 0;
 358 }
 359
 360 static u16 elants_i2c_parse_version(u8 *buf)
 361 {
 362         return get_unaligned_be32(buf) >> 4;
 363 }
 364
 365 static int elants_i2c_query_hw_version(struct elants_data *ts)
 366 {
 367         struct i2c_client *client = ts->client;
 368         int retry_cnt = MAX_RETRIES;
 369         const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 };
 370         u8 resp[HEADER_SIZE];
 371         int error;
 372
 373         while (retry_cnt--) {
 374                 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
 375                                                    resp, sizeof(resp), 1,
 376                                                    "read fw id");
 377                 if (error)
 378                         return error;
 379
 380                 ts->hw_version = elants_i2c_parse_version(resp);
 381                 if (ts->hw_version != 0xffff)
 382                         return 0;
 383         }
 384
 385         dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version);
 386
 387         return -EINVAL;
 388 }
 389
 390 static int elants_i2c_query_fw_version(struct elants_data *ts)
 391 {
 392         struct i2c_client *client = ts->client;
 393         int retry_cnt = MAX_RETRIES;
 394         const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 };
 395         u8 resp[HEADER_SIZE];
 396         int error;
 397
 398         while (retry_cnt--) {
 399                 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
 400                                                    resp, sizeof(resp), 1,
 401                                                    "read fw version");
 402                 if (error)
 403                         return error;
 404
 405                 ts->fw_version = elants_i2c_parse_version(resp);
 406                 if (ts->fw_version != 0x0000 && ts->fw_version != 0xffff)
 407                         return 0;
 408
 409                 dev_dbg(&client->dev, "(read fw version) resp %*phC\n",
 410                         (int)sizeof(resp), resp);
 411         }
 412
 413         dev_err(&client->dev, "Invalid fw ver: %#04x\n", ts->fw_version);
 414
 415         return -EINVAL;
 416 }
 417
 418 static int elants_i2c_query_test_version(struct elants_data *ts)
 419 {
 420         struct i2c_client *client = ts->client;
 421         int error;
 422         u16 version;
 423         const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 };
 424         u8 resp[HEADER_SIZE];
 425
 426         error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
 427                                            resp, sizeof(resp), MAX_RETRIES,
 428                                            "read test version");
 429         if (error) {
 430                 dev_err(&client->dev, "Failed to read test version\n");
 431                 return error;
 432         }
 433
 434         version = elants_i2c_parse_version(resp);
 435         ts->test_version = version >> 8;
 436         ts->solution_version = version & 0xff;
 437
 438         return 0;
 439 }
 440
 441 static int elants_i2c_query_bc_version(struct elants_data *ts)
 442 {
 443         struct i2c_client *client = ts->client;
 444         const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_BC_VER, 0x00, 0x01 };
 445         u8 resp[HEADER_SIZE];
 446         u16 version;
 447         int error;
 448
 449         error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
 450                                            resp, sizeof(resp), 1,
 451                                            "read BC version");
 452         if (error)
 453                 return error;
 454
 455         version = elants_i2c_parse_version(resp);
 456         ts->bc_version = version >> 8;
 457         ts->iap_version = version & 0xff;
 458
 459         return 0;
 460 }
 461
 462 static int elants_i2c_query_ts_info_ektf(struct elants_data *ts)
 463 {
 464         struct i2c_client *client = ts->client;
 465         int error;
 466         u8 resp[4];
 467         u16 phy_x, phy_y;
 468         const u8 get_xres_cmd[] = {
 469                 CMD_HEADER_READ, E_ELAN_INFO_X_RES, 0x00, 0x00
 470         };
 471         const u8 get_yres_cmd[] = {
 472                 CMD_HEADER_READ, E_ELAN_INFO_Y_RES, 0x00, 0x00
 473         };
 474
 475         /* Get X/Y size in mm */
 476         error = elants_i2c_execute_command(client, get_xres_cmd,
 477                                            sizeof(get_xres_cmd),
 478                                            resp, sizeof(resp), 1,
 479                                            "get X size");
 480         if (error)
 481                 return error;
 482
 483         phy_x = resp[2] | ((resp[3] & 0xF0) << 4);
 484
 485         error = elants_i2c_execute_command(client, get_yres_cmd,
 486                                            sizeof(get_yres_cmd),
 487                                            resp, sizeof(resp), 1,
 488                                            "get Y size");
 489         if (error)
 490                 return error;
 491
 492         phy_y = resp[2] | ((resp[3] & 0xF0) << 4);
 493
 494         dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y);
 495
 496         ts->phy_x = phy_x;
 497         ts->phy_y = phy_y;
 498
 499         /* eKTF doesn't report max size, set it to default values */
 500         ts->x_max = 2240 - 1;
 501         ts->y_max = 1408 - 1;
 502
 503         return 0;
 504 }
 505
 506 static int elants_i2c_query_ts_info_ekth(struct elants_data *ts)
 507 {
 508         struct i2c_client *client = ts->client;
 509         int error;
 510         u8 resp[17];
 511         u16 phy_x, phy_y, rows, cols, osr;
 512         const u8 get_resolution_cmd[] = {
 513                 CMD_HEADER_6B_READ, 0x00, 0x00, 0x00, 0x00, 0x00
 514         };
 515         const u8 get_osr_cmd[] = {
 516                 CMD_HEADER_READ, E_INFO_OSR, 0x00, 0x01
 517         };
 518         const u8 get_physical_scan_cmd[] = {
 519                 CMD_HEADER_READ, E_INFO_PHY_SCAN, 0x00, 0x01
 520         };
 521         const u8 get_physical_drive_cmd[] = {
 522                 CMD_HEADER_READ, E_INFO_PHY_DRIVER, 0x00, 0x01
 523         };
 524
 525         /* Get trace number */
 526         error = elants_i2c_execute_command(client,
 527                                            get_resolution_cmd,
 528                                            sizeof(get_resolution_cmd),
 529                                            resp, sizeof(resp), 1,
 530                                            "get resolution");
 531         if (error)
 532                 return error;
 533
 534         rows = resp[2] + resp[6] + resp[10];
 535         cols = resp[3] + resp[7] + resp[11];
 536
 537         /* Get report resolution value of ABS_MT_TOUCH_MAJOR */
 538         ts->major_res = resp[16];
 539
 540         /* Process mm_to_pixel information */
 541         error = elants_i2c_execute_command(client,
 542                                            get_osr_cmd, sizeof(get_osr_cmd),
 543                                            resp, sizeof(resp), 1, "get osr");
 544         if (error)
 545                 return error;
 546
 547         osr = resp[3];
 548
 549         error = elants_i2c_execute_command(client,
 550                                            get_physical_scan_cmd,
 551                                            sizeof(get_physical_scan_cmd),
 552                                            resp, sizeof(resp), 1,
 553                                            "get physical scan");
 554         if (error)
 555                 return error;
 556
 557         phy_x = get_unaligned_be16(&resp[2]);
 558
 559         error = elants_i2c_execute_command(client,
 560                                            get_physical_drive_cmd,
 561                                            sizeof(get_physical_drive_cmd),
 562                                            resp, sizeof(resp), 1,
 563                                            "get physical drive");
 564         if (error)
 565                 return error;
 566
 567         phy_y = get_unaligned_be16(&resp[2]);
 568
 569         dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y);
 570
 571         if (rows == 0 || cols == 0 || osr == 0) {
 572                 dev_warn(&client->dev,
 573                          "invalid trace number data: %d, %d, %d\n",
 574                          rows, cols, osr);
 575         } else {
 576                 /* translate trace number to TS resolution */
 577                 ts->x_max = ELAN_TS_RESOLUTION(rows, osr);
 578                 ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x);
 579                 ts->y_max = ELAN_TS_RESOLUTION(cols, osr);
 580                 ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y);
 581                 ts->phy_x = phy_x;
 582                 ts->phy_y = phy_y;
 583         }
 584
 585         return 0;
 586 }
 587
 588 static int elants_i2c_fastboot(struct i2c_client *client)
 589 {
 590         const u8 boot_cmd[] = { 0x4D, 0x61, 0x69, 0x6E };
 591         int error;
 592
 593         error = elants_i2c_send(client, boot_cmd, sizeof(boot_cmd));
 594         if (error) {
 595                 dev_err(&client->dev, "boot failed: %d\n", error);
 596                 return error;
 597         }
 598
 599         dev_dbg(&client->dev, "boot success -- 0x%x\n", client->addr);
 600         return 0;
 601 }
 602
 603 static int elants_i2c_initialize(struct elants_data *ts)
 604 {
 605         struct i2c_client *client = ts->client;
 606         int error, error2, retry_cnt;
 607         const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 };
 608         const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 };
 609         u8 buf[HEADER_SIZE];
 610
 611         for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
 612                 error = elants_i2c_sw_reset(client);
 613                 if (error) {
 614                         /* Continue initializing if it's the last try */
 615                         if (retry_cnt < MAX_RETRIES - 1)
 616                                 continue;
 617                 }
 618
 619                 error = elants_i2c_fastboot(client);
 620                 if (error) {
 621                         /* Continue initializing if it's the last try */
 622                         if (retry_cnt < MAX_RETRIES - 1)
 623                                 continue;
 624                 }
 625
 626                 /* Wait for Hello packet */
 627                 msleep(BOOT_TIME_DELAY_MS);
 628
 629                 error = elants_i2c_read(client, buf, sizeof(buf));
 630                 if (error) {
 631                         dev_err(&client->dev,
 632                                 "failed to read 'hello' packet: %d\n", error);
 633                 } else if (!memcmp(buf, hello_packet, sizeof(hello_packet))) {
 634                         ts->iap_mode = ELAN_IAP_OPERATIONAL;
 635                         break;
 636                 } else if (!memcmp(buf, recov_packet, sizeof(recov_packet))) {
 637                         /*
 638                          * Setting error code will mark device
 639                          * in recovery mode below.
 640                          */
 641                         error = -EIO;
 642                         break;
 643                 } else {
 644                         error = -EINVAL;
 645                         dev_err(&client->dev,
 646                                 "invalid 'hello' packet: %*ph\n",
 647                                 (int)sizeof(buf), buf);
 648                 }
 649         }
 650
 651         /* hw version is available even if device in recovery state */
 652         error2 = elants_i2c_query_hw_version(ts);
 653         if (!error2)
 654                 error2 = elants_i2c_query_bc_version(ts);
 655         if (!error)
 656                 error = error2;
 657
 658         if (!error)
 659                 error = elants_i2c_query_fw_version(ts);
 660         if (!error)
 661                 error = elants_i2c_query_test_version(ts);
 662
 663         switch (ts->chip_id) {
 664         case EKTH3500:
 665                 if (!error)
 666                         error = elants_i2c_query_ts_info_ekth(ts);
 667                 break;
 668         case EKTF3624:
 669                 if (!error)
 670                         error = elants_i2c_query_ts_info_ektf(ts);
 671                 break;
 672         default:
 673                 BUG();
 674         }
 675
 676         if (error)
 677                 ts->iap_mode = ELAN_IAP_RECOVERY;
 678
 679         return 0;
 680 }
 681
 682 /*
 683  * Firmware update interface.
 684  */
 685
 686 static int elants_i2c_fw_write_page(struct i2c_client *client,
 687                                     const void *page)
 688 {
 689         const u8 ack_ok[] = { 0xaa, 0xaa };
 690         u8 buf[2];
 691         int retry;
 692         int error;
 693
 694         for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) {
 695                 error = elants_i2c_send(client, page, ELAN_FW_PAGESIZE);
 696                 if (error) {
 697                         dev_err(&client->dev,
 698                                 "IAP Write Page failed: %d\n", error);
 699                         continue;
 700                 }
 701
 702                 error = elants_i2c_read(client, buf, 2);
 703                 if (error) {
 704                         dev_err(&client->dev,
 705                                 "IAP Ack read failed: %d\n", error);
 706                         return error;
 707                 }
 708
 709                 if (!memcmp(buf, ack_ok, sizeof(ack_ok)))
 710                         return 0;
 711
 712                 error = -EIO;
 713                 dev_err(&client->dev,
 714                         "IAP Get Ack Error [%02x:%02x]\n",
 715                         buf[0], buf[1]);
 716         }
 717
 718         return error;
 719 }
 720
 721 static int elants_i2c_validate_remark_id(struct elants_data *ts,
 722                                          const struct firmware *fw)
 723 {
 724         struct i2c_client *client = ts->client;
 725         int error;
 726         const u8 cmd[] = { CMD_HEADER_ROM_READ, 0x80, 0x1F, 0x00, 0x00, 0x21 };
 727         u8 resp[6] = { 0 };
 728         u16 ts_remark_id = 0;
 729         u16 fw_remark_id = 0;
 730
 731         /* Compare TS Remark ID and FW Remark ID */
 732         error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
 733                                            resp, sizeof(resp),
 734                                            1, "read Remark ID");
 735         if (error)
 736                 return error;
 737
 738         ts_remark_id = get_unaligned_be16(&resp[3]);
 739
 740         fw_remark_id = get_unaligned_le16(&fw->data[fw->size - 4]);
 741
 742         if (fw_remark_id != ts_remark_id) {
 743                 dev_err(&client->dev,
 744                         "Remark ID Mismatched: ts_remark_id=0x%04x, fw_remark_id=0x%04x.\n",
 745                         ts_remark_id, fw_remark_id);
 746                 return -EINVAL;
 747         }
 748
 749         return 0;
 750 }
 751
 752 static bool elants_i2c_should_check_remark_id(struct elants_data *ts)
 753 {
 754         struct i2c_client *client = ts->client;
 755         const u8 bootcode_version = ts->iap_version;
 756         bool check;
 757
 758         /* I2C eKTH3900 and eKTH5312 are NOT support Remark ID */
 759         if ((bootcode_version == BC_VER_H_BYTE_FOR_EKTH3900x1_I2C) ||
 760             (bootcode_version == BC_VER_H_BYTE_FOR_EKTH3900x2_I2C) ||
 761             (bootcode_version == BC_VER_H_BYTE_FOR_EKTH3900x3_I2C) ||
 762             (bootcode_version == BC_VER_H_BYTE_FOR_EKTH5312x1_I2C) ||
 763             (bootcode_version == BC_VER_H_BYTE_FOR_EKTH5312x2_I2C) ||
 764             (bootcode_version == BC_VER_H_BYTE_FOR_EKTH5312cx1_I2C) ||
 765             (bootcode_version == BC_VER_H_BYTE_FOR_EKTH5312cx2_I2C) ||
 766             (bootcode_version == BC_VER_H_BYTE_FOR_EKTH5312x1_I2C_USB) ||
 767             (bootcode_version == BC_VER_H_BYTE_FOR_EKTH5312x2_I2C_USB) ||
 768             (bootcode_version == BC_VER_H_BYTE_FOR_EKTH5312cx1_I2C_USB) ||
 769             (bootcode_version == BC_VER_H_BYTE_FOR_EKTH5312cx2_I2C_USB)) {
 770                 dev_dbg(&client->dev,
 771                         "eKTH3900/eKTH5312(0x%02x) are not support remark id\n",
 772                         bootcode_version);
 773                 check = false;
 774         } else if (bootcode_version >= 0x60) {
 775                 check = true;
 776         } else {
 777                 check = false;
 778         }
 779
 780         return check;
 781 }
 782
 783 static int elants_i2c_do_update_firmware(struct i2c_client *client,
 784                                          const struct firmware *fw,
 785                                          bool force)
 786 {
 787         struct elants_data *ts = i2c_get_clientdata(client);
 788         const u8 enter_iap[] = { 0x45, 0x49, 0x41, 0x50 };
 789         const u8 enter_iap2[] = { 0x54, 0x00, 0x12, 0x34 };
 790         const u8 iap_ack[] = { 0x55, 0xaa, 0x33, 0xcc };
 791         const u8 close_idle[] = { 0x54, 0x2c, 0x01, 0x01 };
 792         u8 buf[HEADER_SIZE];
 793         u16 send_id;
 794         int page, n_fw_pages;
 795         int error;
 796         bool check_remark_id = elants_i2c_should_check_remark_id(ts);
 797
 798         /* Recovery mode detection! */
 799         if (force) {
 800                 dev_dbg(&client->dev, "Recovery mode procedure\n");
 801
 802                 if (check_remark_id) {
 803                         error = elants_i2c_validate_remark_id(ts, fw);
 804                         if (error)
 805                                 return error;
 806                 }
 807
 808                 error = elants_i2c_send(client, enter_iap2, sizeof(enter_iap2));
 809                 if (error) {
 810                         dev_err(&client->dev, "failed to enter IAP mode: %d\n",
 811                                 error);
 812                         return error;
 813                 }
 814         } else {
 815                 /* Start IAP Procedure */
 816                 dev_dbg(&client->dev, "Normal IAP procedure\n");
 817
 818                 /* Close idle mode */
 819                 error = elants_i2c_send(client, close_idle, sizeof(close_idle));
 820                 if (error)
 821                         dev_err(&client->dev, "Failed close idle: %d\n", error);
 822                 msleep(60);
 823
 824                 elants_i2c_sw_reset(client);
 825                 msleep(20);
 826
 827                 if (check_remark_id) {
 828                         error = elants_i2c_validate_remark_id(ts, fw);
 829                         if (error)
 830                                 return error;
 831                 }
 832
 833                 error = elants_i2c_send(client, enter_iap, sizeof(enter_iap));
 834                 if (error) {
 835                         dev_err(&client->dev, "failed to enter IAP mode: %d\n",
 836                                 error);
 837                         return error;
 838                 }
 839         }
 840
 841         msleep(20);
 842
 843         /* check IAP state */
 844         error = elants_i2c_read(client, buf, 4);
 845         if (error) {
 846                 dev_err(&client->dev,
 847                         "failed to read IAP acknowledgement: %d\n",
 848                         error);
 849                 return error;
 850         }
 851
 852         if (memcmp(buf, iap_ack, sizeof(iap_ack))) {
 853                 dev_err(&client->dev,
 854                         "failed to enter IAP: %*ph (expected %*ph)\n",
 855                         (int)sizeof(buf), buf, (int)sizeof(iap_ack), iap_ack);
 856                 return -EIO;
 857         }
 858
 859         dev_info(&client->dev, "successfully entered IAP mode");
 860
 861         send_id = client->addr;
 862         error = elants_i2c_send(client, &send_id, 1);
 863         if (error) {
 864                 dev_err(&client->dev, "sending dummy byte failed: %d\n",
 865                         error);
 866                 return error;
 867         }
 868
 869         /* Clear the last page of Master */
 870         error = elants_i2c_send(client, fw->data, ELAN_FW_PAGESIZE);
 871         if (error) {
 872                 dev_err(&client->dev, "clearing of the last page failed: %d\n",
 873                         error);
 874                 return error;
 875         }
 876
 877         error = elants_i2c_read(client, buf, 2);
 878         if (error) {
 879                 dev_err(&client->dev,
 880                         "failed to read ACK for clearing the last page: %d\n",
 881                         error);
 882                 return error;
 883         }
 884
 885         n_fw_pages = fw->size / ELAN_FW_PAGESIZE;
 886         dev_dbg(&client->dev, "IAP Pages = %d\n", n_fw_pages);
 887
 888         for (page = 0; page < n_fw_pages; page++) {
 889                 error = elants_i2c_fw_write_page(client,
 890                                         fw->data + page * ELAN_FW_PAGESIZE);
 891                 if (error) {
 892                         dev_err(&client->dev,
 893                                 "failed to write FW page %d: %d\n",
 894                                 page, error);
 895                         return error;
 896                 }
 897         }
 898
 899         /* Old iap needs to wait 200ms for WDT and rest is for hello packets */
 900         msleep(300);
 901
 902         dev_info(&client->dev, "firmware update completed\n");
 903         return 0;
 904 }
 905
 906 static int elants_i2c_fw_update(struct elants_data *ts)
 907 {
 908         struct i2c_client *client = ts->client;
 909         const struct firmware *fw;
 910         char *fw_name;
 911         int error;
 912
 913         fw_name = kasprintf(GFP_KERNEL, "/*(DEBLOBBED)*/", ts->hw_version);
 914         if (!fw_name)
 915                 return -ENOMEM;
 916
 917         dev_info(&client->dev, "requesting fw name = %s\n", fw_name);
 918         error = reject_firmware(&fw, fw_name, &client->dev);
 919         kfree(fw_name);
 920         if (error) {
 921                 dev_err(&client->dev, "failed to request firmware: %d\n",
 922                         error);
 923                 return error;
 924         }
 925
 926         if (fw->size % ELAN_FW_PAGESIZE) {
 927                 dev_err(&client->dev, "invalid firmware length: %zu\n",
 928                         fw->size);
 929                 error = -EINVAL;
 930                 goto out;
 931         }
 932
 933         disable_irq(client->irq);
 934
 935         error = elants_i2c_do_update_firmware(client, fw,
 936                                         ts->iap_mode == ELAN_IAP_RECOVERY);
 937         if (error) {
 938                 dev_err(&client->dev, "firmware update failed: %d\n", error);
 939                 ts->iap_mode = ELAN_IAP_RECOVERY;
 940                 goto out_enable_irq;
 941         }
 942
 943         error = elants_i2c_initialize(ts);
 944         if (error) {
 945                 dev_err(&client->dev,
 946                         "failed to initialize device after firmware update: %d\n",
 947                         error);
 948                 ts->iap_mode = ELAN_IAP_RECOVERY;
 949                 goto out_enable_irq;
 950         }
 951
 952         ts->iap_mode = ELAN_IAP_OPERATIONAL;
 953
 954 out_enable_irq:
 955         ts->state = ELAN_STATE_NORMAL;
 956         enable_irq(client->irq);
 957         msleep(100);
 958
 959         if (!error)
 960                 elants_i2c_calibrate(ts);
 961 out:
 962         release_firmware(fw);
 963         return error;
 964 }
 965
 966 /*
 967  * Event reporting.
 968  */
 969
 970 static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf,
 971                                 size_t packet_size)
 972 {
 973         struct input_dev *input = ts->input;
 974         unsigned int n_fingers;
 975         unsigned int tool_type;
 976         u16 finger_state;
 977         int i;
 978
 979         n_fingers = buf[FW_POS_STATE + 1] & 0x0f;
 980         finger_state = ((buf[FW_POS_STATE + 1] & 0x30) << 4) |
 981                         buf[FW_POS_STATE];
 982
 983         dev_dbg(&ts->client->dev,
 984                 "n_fingers: %u, state: %04x\n",  n_fingers, finger_state);
 985
 986         /* Note: all fingers have the same tool type */
 987         tool_type = buf[FW_POS_TOOL_TYPE] & BIT(0) ?
 988                         MT_TOOL_FINGER : MT_TOOL_PALM;
 989
 990         for (i = 0; i < MAX_CONTACT_NUM && n_fingers; i++) {
 991                 if (finger_state & 1) {
 992                         unsigned int x, y, p, w;
 993                         u8 *pos;
 994
 995                         pos = &buf[FW_POS_XY + i * 3];
 996                         x = (((u16)pos[0] & 0xf0) << 4) | pos[1];
 997                         y = (((u16)pos[0] & 0x0f) << 8) | pos[2];
 998
 999                         /*
1000                          * eKTF3624 may have use "old" touch-report format,
1001                          * depending on a device and TS firmware version.
1002                          * For example, ASUS Transformer devices use the "old"
1003                          * format, while ASUS Nexus 7 uses the "new" formant.
1004                          */
1005                         if (packet_size == PACKET_SIZE_OLD &&
1006                             ts->chip_id == EKTF3624) {
1007                                 w = buf[FW_POS_WIDTH + i / 2];
1008                                 w >>= 4 * (~i & 1);
1009                                 w |= w << 4;
1010                                 w |= !w;
1011                                 p = w;
1012                         } else {
1013                                 p = buf[FW_POS_PRESSURE + i];
1014                                 w = buf[FW_POS_WIDTH + i];
1015                         }
1016
1017                         dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n",
1018                                 i, x, y, p, w);
1019
1020                         input_mt_slot(input, i);
1021                         input_mt_report_slot_state(input, tool_type, true);
1022                         touchscreen_report_pos(input, &ts->prop, x, y, true);
1023                         input_event(input, EV_ABS, ABS_MT_PRESSURE, p);
1024                         input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w);
1025
1026                         n_fingers--;
1027                 }
1028
1029                 finger_state >>= 1;
1030         }
1031
1032         input_mt_sync_frame(input);
1033         input_sync(input);
1034 }
1035
1036 static u8 elants_i2c_calculate_checksum(u8 *buf)
1037 {
1038         u8 checksum = 0;
1039         u8 i;
1040
1041         for (i = 0; i < FW_POS_CHECKSUM; i++)
1042                 checksum += buf[i];
1043
1044         return checksum;
1045 }
1046
1047 static void elants_i2c_event(struct elants_data *ts, u8 *buf,
1048                              size_t packet_size)
1049 {
1050         u8 checksum = elants_i2c_calculate_checksum(buf);
1051
1052         if (unlikely(buf[FW_POS_CHECKSUM] != checksum))
1053                 dev_warn(&ts->client->dev,
1054                          "%s: invalid checksum for packet %02x: %02x vs. %02x\n",
1055                          __func__, buf[FW_POS_HEADER],
1056                          checksum, buf[FW_POS_CHECKSUM]);
1057         else if (unlikely(buf[FW_POS_HEADER] != HEADER_REPORT_10_FINGER))
1058                 dev_warn(&ts->client->dev,
1059                          "%s: unknown packet type: %02x\n",
1060                          __func__, buf[FW_POS_HEADER]);
1061         else
1062                 elants_i2c_mt_event(ts, buf, packet_size);
1063 }
1064
1065 static irqreturn_t elants_i2c_irq(int irq, void *_dev)
1066 {
1067         const u8 wait_packet[] = { 0x64, 0x64, 0x64, 0x64 };
1068         struct elants_data *ts = _dev;
1069         struct i2c_client *client = ts->client;
1070         int report_count, report_len;
1071         int i;
1072         int len;
1073
1074         len = i2c_master_recv_dmasafe(client, ts->buf, sizeof(ts->buf));
1075         if (len < 0) {
1076                 dev_err(&client->dev, "%s: failed to read data: %d\n",
1077                         __func__, len);
1078                 goto out;
1079         }
1080
1081         dev_dbg(&client->dev, "%s: packet %*ph\n",
1082                 __func__, HEADER_SIZE, ts->buf);
1083
1084         switch (ts->state) {
1085         case ELAN_WAIT_RECALIBRATION:
1086                 if (ts->buf[FW_HDR_TYPE] == CMD_HEADER_REK) {
1087                         memcpy(ts->cmd_resp, ts->buf, sizeof(ts->cmd_resp));
1088                         complete(&ts->cmd_done);
1089                         ts->state = ELAN_STATE_NORMAL;
1090                 }
1091                 break;
1092
1093         case ELAN_WAIT_QUEUE_HEADER:
1094                 if (ts->buf[FW_HDR_TYPE] != QUEUE_HEADER_NORMAL)
1095                         break;
1096
1097                 ts->state = ELAN_STATE_NORMAL;
1098                 fallthrough;
1099
1100         case ELAN_STATE_NORMAL:
1101
1102                 switch (ts->buf[FW_HDR_TYPE]) {
1103                 case CMD_HEADER_HELLO:
1104                 case CMD_HEADER_RESP:
1105                         break;
1106
1107                 case QUEUE_HEADER_WAIT:
1108                         if (memcmp(ts->buf, wait_packet, sizeof(wait_packet))) {
1109                                 dev_err(&client->dev,
1110                                         "invalid wait packet %*ph\n",
1111                                         HEADER_SIZE, ts->buf);
1112                         } else {
1113                                 ts->state = ELAN_WAIT_QUEUE_HEADER;
1114                                 udelay(30);
1115                         }
1116                         break;
1117
1118                 case QUEUE_HEADER_SINGLE:
1119                         elants_i2c_event(ts, &ts->buf[HEADER_SIZE],
1120                                          ts->buf[FW_HDR_LENGTH]);
1121                         break;
1122
1123                 case QUEUE_HEADER_NORMAL2: /* CMD_HEADER_REK */
1124                         /*
1125                          * Depending on firmware version, eKTF3624 touchscreens
1126                          * may utilize one of these opcodes for the touch events:
1127                          * 0x63 (NORMAL) and 0x66 (NORMAL2).  The 0x63 is used by
1128                          * older firmware version and differs from 0x66 such that
1129                          * touch pressure value needs to be adjusted.  The 0x66
1130                          * opcode of newer firmware is equal to 0x63 of eKTH3500.
1131                          */
1132                         if (ts->chip_id != EKTF3624)
1133                                 break;
1134
1135                         fallthrough;
1136
1137                 case QUEUE_HEADER_NORMAL:
1138                         report_count = ts->buf[FW_HDR_COUNT];
1139                         if (report_count == 0 || report_count > 3) {
1140                                 dev_err(&client->dev,
1141                                         "bad report count: %*ph\n",
1142                                         HEADER_SIZE, ts->buf);
1143                                 break;
1144                         }
1145
1146                         report_len = ts->buf[FW_HDR_LENGTH] / report_count;
1147
1148                         if (report_len == PACKET_SIZE_OLD &&
1149                             ts->chip_id == EKTF3624) {
1150                                 dev_dbg_once(&client->dev,
1151                                              "using old report format\n");
1152                         } else if (report_len != PACKET_SIZE) {
1153                                 dev_err(&client->dev,
1154                                         "mismatching report length: %*ph\n",
1155                                         HEADER_SIZE, ts->buf);
1156                                 break;
1157                         }
1158
1159                         for (i = 0; i < report_count; i++) {
1160                                 u8 *buf = ts->buf + HEADER_SIZE +
1161                                                         i * report_len;
1162                                 elants_i2c_event(ts, buf, report_len);
1163                         }
1164                         break;
1165
1166                 default:
1167                         dev_err(&client->dev, "unknown packet %*ph\n",
1168                                 HEADER_SIZE, ts->buf);
1169                         break;
1170                 }
1171                 break;
1172         }
1173
1174 out:
1175         return IRQ_HANDLED;
1176 }
1177
1178 /*
1179  * sysfs interface
1180  */
1181 static ssize_t calibrate_store(struct device *dev,
1182                                struct device_attribute *attr,
1183                                const char *buf, size_t count)
1184 {
1185         struct i2c_client *client = to_i2c_client(dev);
1186         struct elants_data *ts = i2c_get_clientdata(client);
1187         int error;
1188
1189         error = mutex_lock_interruptible(&ts->sysfs_mutex);
1190         if (error)
1191                 return error;
1192
1193         error = elants_i2c_calibrate(ts);
1194
1195         mutex_unlock(&ts->sysfs_mutex);
1196         return error ?: count;
1197 }
1198
1199 static ssize_t write_update_fw(struct device *dev,
1200                                struct device_attribute *attr,
1201                                const char *buf, size_t count)
1202 {
1203         struct i2c_client *client = to_i2c_client(dev);
1204         struct elants_data *ts = i2c_get_clientdata(client);
1205         int error;
1206
1207         error = mutex_lock_interruptible(&ts->sysfs_mutex);
1208         if (error)
1209                 return error;
1210
1211         error = elants_i2c_fw_update(ts);
1212         dev_dbg(dev, "firmware update result: %d\n", error);
1213
1214         mutex_unlock(&ts->sysfs_mutex);
1215         return error ?: count;
1216 }
1217
1218 static ssize_t show_iap_mode(struct device *dev,
1219                              struct device_attribute *attr, char *buf)
1220 {
1221         struct i2c_client *client = to_i2c_client(dev);
1222         struct elants_data *ts = i2c_get_clientdata(client);
1223
1224         return sprintf(buf, "%s\n",
1225                        ts->iap_mode == ELAN_IAP_OPERATIONAL ?
1226                                 "Normal" : "Recovery");
1227 }
1228
1229 static ssize_t show_calibration_count(struct device *dev,
1230                                       struct device_attribute *attr, char *buf)
1231 {
1232         struct i2c_client *client = to_i2c_client(dev);
1233         const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_REK, 0x00, 0x01 };
1234         u8 resp[HEADER_SIZE];
1235         u16 rek_count;
1236         int error;
1237
1238         error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
1239                                            resp, sizeof(resp), 1,
1240                                            "read ReK status");
1241         if (error)
1242                 return sprintf(buf, "%d\n", error);
1243
1244         rek_count = get_unaligned_be16(&resp[2]);
1245         return sprintf(buf, "0x%04x\n", rek_count);
1246 }
1247
1248 static DEVICE_ATTR_WO(calibrate);
1249 static DEVICE_ATTR(iap_mode, S_IRUGO, show_iap_mode, NULL);
1250 static DEVICE_ATTR(calibration_count, S_IRUGO, show_calibration_count, NULL);
1251 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw);
1252
1253 struct elants_version_attribute {
1254         struct device_attribute dattr;
1255         size_t field_offset;
1256         size_t field_size;
1257 };
1258
1259 #define __ELANTS_FIELD_SIZE(_field)                                     \
1260         sizeof(((struct elants_data *)NULL)->_field)
1261 #define __ELANTS_VERIFY_SIZE(_field)                                    \
1262         (BUILD_BUG_ON_ZERO(__ELANTS_FIELD_SIZE(_field) > 2) +           \
1263          __ELANTS_FIELD_SIZE(_field))
1264 #define ELANTS_VERSION_ATTR(_field)                                     \
1265         struct elants_version_attribute elants_ver_attr_##_field = {    \
1266                 .dattr = __ATTR(_field, S_IRUGO,                        \
1267                                 elants_version_attribute_show, NULL),   \
1268                 .field_offset = offsetof(struct elants_data, _field),   \
1269                 .field_size = __ELANTS_VERIFY_SIZE(_field),             \
1270         }
1271
1272 static ssize_t elants_version_attribute_show(struct device *dev,
1273                                              struct device_attribute *dattr,
1274                                              char *buf)
1275 {
1276         struct i2c_client *client = to_i2c_client(dev);
1277         struct elants_data *ts = i2c_get_clientdata(client);
1278         struct elants_version_attribute *attr =
1279                 container_of(dattr, struct elants_version_attribute, dattr);
1280         u8 *field = (u8 *)((char *)ts + attr->field_offset);
1281         unsigned int fmt_size;
1282         unsigned int val;
1283
1284         if (attr->field_size == 1) {
1285                 val = *field;
1286                 fmt_size = 2; /* 2 HEX digits */
1287         } else {
1288                 val = *(u16 *)field;
1289                 fmt_size = 4; /* 4 HEX digits */
1290         }
1291
1292         return sprintf(buf, "%0*x\n", fmt_size, val);
1293 }
1294
1295 static ELANTS_VERSION_ATTR(fw_version);
1296 static ELANTS_VERSION_ATTR(hw_version);
1297 static ELANTS_VERSION_ATTR(test_version);
1298 static ELANTS_VERSION_ATTR(solution_version);
1299 static ELANTS_VERSION_ATTR(bc_version);
1300 static ELANTS_VERSION_ATTR(iap_version);
1301
1302 static struct attribute *elants_i2c_attrs[] = {
1303         &dev_attr_calibrate.attr,
1304         &dev_attr_update_fw.attr,
1305         &dev_attr_iap_mode.attr,
1306         &dev_attr_calibration_count.attr,
1307
1308         &elants_ver_attr_fw_version.dattr.attr,
1309         &elants_ver_attr_hw_version.dattr.attr,
1310         &elants_ver_attr_test_version.dattr.attr,
1311         &elants_ver_attr_solution_version.dattr.attr,
1312         &elants_ver_attr_bc_version.dattr.attr,
1313         &elants_ver_attr_iap_version.dattr.attr,
1314         NULL
1315 };
1316 ATTRIBUTE_GROUPS(elants_i2c);
1317
1318 static int elants_i2c_power_on(struct elants_data *ts)
1319 {
1320         int error;
1321
1322         /*
1323          * If we do not have reset gpio assume platform firmware
1324          * controls regulators and does power them on for us.
1325          */
1326         if (IS_ERR_OR_NULL(ts->reset_gpio))
1327                 return 0;
1328
1329         error = regulator_enable(ts->vcc33);
1330         if (error) {
1331                 dev_err(&ts->client->dev,
1332                         "failed to enable vcc33 regulator: %d\n",
1333                         error);
1334                 return error;
1335         }
1336
1337         error = regulator_enable(ts->vccio);
1338         if (error) {
1339                 dev_err(&ts->client->dev,
1340                         "failed to enable vccio regulator: %d\n",
1341                         error);
1342                 regulator_disable(ts->vcc33);
1343                 return error;
1344         }
1345
1346         /*
1347          * We need to wait a bit after powering on controller before
1348          * we are allowed to release reset GPIO.
1349          */
1350         usleep_range(ELAN_POWERON_DELAY_USEC, ELAN_POWERON_DELAY_USEC + 100);
1351
1352         gpiod_set_value_cansleep(ts->reset_gpio, 0);
1353
1354         msleep(ELAN_RESET_DELAY_MSEC);
1355
1356         return 0;
1357 }
1358
1359 static void elants_i2c_power_off(void *_data)
1360 {
1361         struct elants_data *ts = _data;
1362
1363         if (!IS_ERR_OR_NULL(ts->reset_gpio)) {
1364                 /*
1365                  * Activate reset gpio to prevent leakage through the
1366                  * pin once we shut off power to the controller.
1367                  */
1368                 gpiod_set_value_cansleep(ts->reset_gpio, 1);
1369                 regulator_disable(ts->vccio);
1370                 regulator_disable(ts->vcc33);
1371         }
1372 }
1373
1374 #ifdef CONFIG_ACPI
1375 static const struct acpi_device_id i2c_hid_ids[] = {
1376         {"ACPI0C50", 0 },
1377         {"PNP0C50", 0 },
1378         { },
1379 };
1380
1381 static const guid_t i2c_hid_guid =
1382         GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
1383                   0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
1384
1385 static bool elants_acpi_is_hid_device(struct device *dev)
1386 {
1387         acpi_handle handle = ACPI_HANDLE(dev);
1388         union acpi_object *obj;
1389
1390         if (acpi_match_device_ids(ACPI_COMPANION(dev), i2c_hid_ids))
1391                 return false;
1392
1393         obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL, ACPI_TYPE_INTEGER);
1394         if (obj) {
1395                 ACPI_FREE(obj);
1396                 return true;
1397         }
1398
1399         return false;
1400 }
1401 #else
1402 static bool elants_acpi_is_hid_device(struct device *dev)
1403 {
1404         return false;
1405 }
1406 #endif
1407
1408 static int elants_i2c_probe(struct i2c_client *client)
1409 {
1410         union i2c_smbus_data dummy;
1411         struct elants_data *ts;
1412         unsigned long irqflags;
1413         int error;
1414
1415         /* Don't bind to i2c-hid compatible devices, these are handled by the i2c-hid drv. */
1416         if (elants_acpi_is_hid_device(&client->dev)) {
1417                 dev_warn(&client->dev, "This device appears to be an I2C-HID device, not binding\n");
1418                 return -ENODEV;
1419         }
1420
1421         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1422                 dev_err(&client->dev, "I2C check functionality error\n");
1423                 return -ENXIO;
1424         }
1425
1426         ts = devm_kzalloc(&client->dev, sizeof(struct elants_data), GFP_KERNEL);
1427         if (!ts)
1428                 return -ENOMEM;
1429
1430         mutex_init(&ts->sysfs_mutex);
1431         init_completion(&ts->cmd_done);
1432
1433         ts->client = client;
1434         ts->chip_id = (enum elants_chip_id)(uintptr_t)device_get_match_data(&client->dev);
1435         i2c_set_clientdata(client, ts);
1436
1437         ts->vcc33 = devm_regulator_get(&client->dev, "vcc33");
1438         if (IS_ERR(ts->vcc33))
1439                 return dev_err_probe(&client->dev, PTR_ERR(ts->vcc33),
1440                                      "Failed to get 'vcc33' regulator\n");
1441
1442         ts->vccio = devm_regulator_get(&client->dev, "vccio");
1443         if (IS_ERR(ts->vccio))
1444                 return dev_err_probe(&client->dev, PTR_ERR(ts->vccio),
1445                                      "Failed to get 'vccio' regulator\n");
1446
1447         ts->reset_gpio = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);
1448         if (IS_ERR(ts->reset_gpio)) {
1449                 error = PTR_ERR(ts->reset_gpio);
1450
1451                 if (error == -EPROBE_DEFER)
1452                         return error;
1453
1454                 if (error != -ENOENT && error != -ENOSYS) {
1455                         dev_err(&client->dev,
1456                                 "failed to get reset gpio: %d\n",
1457                                 error);
1458                         return error;
1459                 }
1460
1461                 ts->keep_power_in_suspend = true;
1462         }
1463
1464         error = elants_i2c_power_on(ts);
1465         if (error)
1466                 return error;
1467
1468         error = devm_add_action_or_reset(&client->dev,
1469                                          elants_i2c_power_off, ts);
1470         if (error) {
1471                 dev_err(&client->dev,
1472                         "failed to install power off action: %d\n", error);
1473                 return error;
1474         }
1475
1476         /* Make sure there is something at this address */
1477         if (i2c_smbus_xfer(client->adapter, client->addr, 0,
1478                            I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) {
1479                 dev_err(&client->dev, "nothing at this address\n");
1480                 return -ENXIO;
1481         }
1482
1483         error = elants_i2c_initialize(ts);
1484         if (error) {
1485                 dev_err(&client->dev, "failed to initialize: %d\n", error);
1486                 return error;
1487         }
1488
1489         ts->input = devm_input_allocate_device(&client->dev);
1490         if (!ts->input) {
1491                 dev_err(&client->dev, "Failed to allocate input device\n");
1492                 return -ENOMEM;
1493         }
1494
1495         ts->input->name = "Elan Touchscreen";
1496         ts->input->id.bustype = BUS_I2C;
1497
1498         /* Multitouch input params setup */
1499
1500         input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0);
1501         input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0);
1502         input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
1503         input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
1504         input_set_abs_params(ts->input, ABS_MT_TOOL_TYPE,
1505                              0, MT_TOOL_PALM, 0, 0);
1506
1507         touchscreen_parse_properties(ts->input, true, &ts->prop);
1508
1509         if (ts->chip_id == EKTF3624 && ts->phy_x && ts->phy_y) {
1510                 /* calculate resolution from size */
1511                 ts->x_res = DIV_ROUND_CLOSEST(ts->prop.max_x, ts->phy_x);
1512                 ts->y_res = DIV_ROUND_CLOSEST(ts->prop.max_y, ts->phy_y);
1513         }
1514
1515         input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res);
1516         input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res);
1517         input_abs_set_res(ts->input, ABS_MT_TOUCH_MAJOR, ts->major_res);
1518
1519         error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM,
1520                                     INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
1521         if (error) {
1522                 dev_err(&client->dev,
1523                         "failed to initialize MT slots: %d\n", error);
1524                 return error;
1525         }
1526
1527         error = input_register_device(ts->input);
1528         if (error) {
1529                 dev_err(&client->dev,
1530                         "unable to register input device: %d\n", error);
1531                 return error;
1532         }
1533
1534         /*
1535          * Platform code (ACPI, DTS) should normally set up interrupt
1536          * for us, but in case it did not let's fall back to using falling
1537          * edge to be compatible with older Chromebooks.
1538          */
1539         irqflags = irq_get_trigger_type(client->irq);
1540         if (!irqflags)
1541                 irqflags = IRQF_TRIGGER_FALLING;
1542
1543         error = devm_request_threaded_irq(&client->dev, client->irq,
1544                                           NULL, elants_i2c_irq,
1545                                           irqflags | IRQF_ONESHOT,
1546                                           client->name, ts);
1547         if (error) {
1548                 dev_err(&client->dev, "Failed to register interrupt\n");
1549                 return error;
1550         }
1551
1552         return 0;
1553 }
1554
1555 static int elants_i2c_suspend(struct device *dev)
1556 {
1557         struct i2c_client *client = to_i2c_client(dev);
1558         struct elants_data *ts = i2c_get_clientdata(client);
1559         const u8 set_sleep_cmd[] = {
1560                 CMD_HEADER_WRITE, E_POWER_STATE_SLEEP, 0x00, 0x01
1561         };
1562         int retry_cnt;
1563         int error;
1564
1565         /* Command not support in IAP recovery mode */
1566         if (ts->iap_mode != ELAN_IAP_OPERATIONAL)
1567                 return -EBUSY;
1568
1569         disable_irq(client->irq);
1570
1571         if (device_may_wakeup(dev)) {
1572                 /*
1573                  * The device will automatically enter idle mode
1574                  * that has reduced power consumption.
1575                  */
1576                 return 0;
1577         } else if (ts->keep_power_in_suspend) {
1578                 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
1579                         error = elants_i2c_send(client, set_sleep_cmd,
1580                                                 sizeof(set_sleep_cmd));
1581                         if (!error)
1582                                 break;
1583
1584                         dev_err(&client->dev,
1585                                 "suspend command failed: %d\n", error);
1586                 }
1587         } else {
1588                 elants_i2c_power_off(ts);
1589         }
1590
1591         return 0;
1592 }
1593
1594 static int elants_i2c_resume(struct device *dev)
1595 {
1596         struct i2c_client *client = to_i2c_client(dev);
1597         struct elants_data *ts = i2c_get_clientdata(client);
1598         const u8 set_active_cmd[] = {
1599                 CMD_HEADER_WRITE, E_POWER_STATE_RESUME, 0x00, 0x01
1600         };
1601         int retry_cnt;
1602         int error;
1603
1604         if (device_may_wakeup(dev)) {
1605                 elants_i2c_sw_reset(client);
1606         } else if (ts->keep_power_in_suspend) {
1607                 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
1608                         error = elants_i2c_send(client, set_active_cmd,
1609                                                 sizeof(set_active_cmd));
1610                         if (!error)
1611                                 break;
1612
1613                         dev_err(&client->dev,
1614                                 "resume command failed: %d\n", error);
1615                 }
1616         } else {
1617                 elants_i2c_power_on(ts);
1618                 elants_i2c_initialize(ts);
1619         }
1620
1621         ts->state = ELAN_STATE_NORMAL;
1622         enable_irq(client->irq);
1623
1624         return 0;
1625 }
1626
1627 static DEFINE_SIMPLE_DEV_PM_OPS(elants_i2c_pm_ops,
1628                                 elants_i2c_suspend, elants_i2c_resume);
1629
1630 static const struct i2c_device_id elants_i2c_id[] = {
1631         { DEVICE_NAME, EKTH3500 },
1632         { "ekth3500", EKTH3500 },
1633         { "ektf3624", EKTF3624 },
1634         { }
1635 };
1636 MODULE_DEVICE_TABLE(i2c, elants_i2c_id);
1637
1638 #ifdef CONFIG_ACPI
1639 static const struct acpi_device_id elants_acpi_id[] = {
1640         { "ELAN0001", EKTH3500 },
1641         { }
1642 };
1643 MODULE_DEVICE_TABLE(acpi, elants_acpi_id);
1644 #endif
1645
1646 #ifdef CONFIG_OF
1647 static const struct of_device_id elants_of_match[] = {
1648         { .compatible = "elan,ekth3500", .data = (void *)EKTH3500 },
1649         { .compatible = "elan,ektf3624", .data = (void *)EKTF3624 },
1650         { /* sentinel */ }
1651 };
1652 MODULE_DEVICE_TABLE(of, elants_of_match);
1653 #endif
1654
1655 static struct i2c_driver elants_i2c_driver = {
1656         .probe = elants_i2c_probe,
1657         .id_table = elants_i2c_id,
1658         .driver = {
1659                 .name = DEVICE_NAME,
1660                 .dev_groups = elants_i2c_groups,
1661                 .pm = pm_sleep_ptr(&elants_i2c_pm_ops),
1662                 .acpi_match_table = ACPI_PTR(elants_acpi_id),
1663                 .of_match_table = of_match_ptr(elants_of_match),
1664                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1665         },
1666 };
1667 module_i2c_driver(elants_i2c_driver);
1668
1669 MODULE_AUTHOR("Scott Liu <scott.liu@emc.com.tw>");
1670 MODULE_DESCRIPTION("Elan I2c Touchscreen driver");
1671 MODULE_LICENSE("GPL");