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/gpio/consumer.h>
  40 #include <linux/regulator/consumer.h>
  41 #include <asm/unaligned.h>
  42
  43 /* Device, Driver information */
  44 #define DEVICE_NAME     "elants_i2c"
  45
  46 /* Convert from rows or columns into resolution */
  47 #define ELAN_TS_RESOLUTION(n, m)   (((n) - 1) * (m))
  48
  49 /* FW header data */
  50 #define HEADER_SIZE             4
  51 #define FW_HDR_TYPE             0
  52 #define FW_HDR_COUNT            1
  53 #define FW_HDR_LENGTH           2
  54
  55 /* Buffer mode Queue Header information */
  56 #define QUEUE_HEADER_SINGLE     0x62
  57 #define QUEUE_HEADER_NORMAL     0X63
  58 #define QUEUE_HEADER_WAIT       0x64
  59
  60 /* Command header definition */
  61 #define CMD_HEADER_WRITE        0x54
  62 #define CMD_HEADER_READ         0x53
  63 #define CMD_HEADER_6B_READ      0x5B
  64 #define CMD_HEADER_ROM_READ     0x96
  65 #define CMD_HEADER_RESP         0x52
  66 #define CMD_HEADER_6B_RESP      0x9B
  67 #define CMD_HEADER_ROM_RESP     0x95
  68 #define CMD_HEADER_HELLO        0x55
  69 #define CMD_HEADER_REK          0x66
  70
  71 /* FW position data */
  72 #define PACKET_SIZE             55
  73 #define MAX_CONTACT_NUM         10
  74 #define FW_POS_HEADER           0
  75 #define FW_POS_STATE            1
  76 #define FW_POS_TOTAL            2
  77 #define FW_POS_XY               3
  78 #define FW_POS_TOOL_TYPE        33
  79 #define FW_POS_CHECKSUM         34
  80 #define FW_POS_WIDTH            35
  81 #define FW_POS_PRESSURE         45
  82
  83 #define HEADER_REPORT_10_FINGER 0x62
  84
  85 /* Header (4 bytes) plus 3 fill 10-finger packets */
  86 #define MAX_PACKET_SIZE         169
  87
  88 #define BOOT_TIME_DELAY_MS      50
  89
  90 /* FW read command, 0x53 0x?? 0x0, 0x01 */
  91 #define E_ELAN_INFO_FW_VER      0x00
  92 #define E_ELAN_INFO_BC_VER      0x10
  93 #define E_ELAN_INFO_REK         0xE0
  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         struct touchscreen_properties prop;
 142
 143         enum elants_state state;
 144         enum elants_iap_mode iap_mode;
 145
 146         /* Guards against concurrent access to the device via sysfs */
 147         struct mutex sysfs_mutex;
 148
 149         u8 cmd_resp[HEADER_SIZE];
 150         struct completion cmd_done;
 151
 152         bool wake_irq_enabled;
 153         bool keep_power_in_suspend;
 154
 155         /* Must be last to be used for DMA operations */
 156         u8 buf[MAX_PACKET_SIZE] ____cacheline_aligned;
 157 };
 158
 159 static int elants_i2c_send(struct i2c_client *client,
 160                            const void *data, size_t size)
 161 {
 162         int ret;
 163
 164         ret = i2c_master_send(client, data, size);
 165         if (ret == size)
 166                 return 0;
 167
 168         if (ret >= 0)
 169                 ret = -EIO;
 170
 171         dev_err(&client->dev, "%s failed (%*ph): %d\n",
 172                 __func__, (int)size, data, ret);
 173
 174         return ret;
 175 }
 176
 177 static int elants_i2c_read(struct i2c_client *client, void *data, size_t size)
 178 {
 179         int ret;
 180
 181         ret = i2c_master_recv(client, data, size);
 182         if (ret == size)
 183                 return 0;
 184
 185         if (ret >= 0)
 186                 ret = -EIO;
 187
 188         dev_err(&client->dev, "%s failed: %d\n", __func__, ret);
 189
 190         return ret;
 191 }
 192
 193 static int elants_i2c_execute_command(struct i2c_client *client,
 194                                       const u8 *cmd, size_t cmd_size,
 195                                       u8 *resp, size_t resp_size,
 196                                       int retries, const char *cmd_name)
 197 {
 198         struct i2c_msg msgs[2];
 199         int ret;
 200         u8 expected_response;
 201
 202         switch (cmd[0]) {
 203         case CMD_HEADER_READ:
 204                 expected_response = CMD_HEADER_RESP;
 205                 break;
 206
 207         case CMD_HEADER_6B_READ:
 208                 expected_response = CMD_HEADER_6B_RESP;
 209                 break;
 210
 211         case CMD_HEADER_ROM_READ:
 212                 expected_response = CMD_HEADER_ROM_RESP;
 213                 break;
 214
 215         default:
 216                 dev_err(&client->dev, "(%s): invalid command: %*ph\n",
 217                         cmd_name, (int)cmd_size, cmd);
 218                 return -EINVAL;
 219         }
 220
 221         for (;;) {
 222                 msgs[0].addr = client->addr;
 223                 msgs[0].flags = client->flags & I2C_M_TEN;
 224                 msgs[0].len = cmd_size;
 225                 msgs[0].buf = (u8 *)cmd;
 226
 227                 msgs[1].addr = client->addr;
 228                 msgs[1].flags = (client->flags & I2C_M_TEN) | I2C_M_RD;
 229                 msgs[1].flags |= I2C_M_RD;
 230                 msgs[1].len = resp_size;
 231                 msgs[1].buf = resp;
 232
 233                 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
 234                 if (ret < 0) {
 235                         if (--retries > 0) {
 236                                 dev_dbg(&client->dev,
 237                                         "(%s) I2C transfer failed: %pe (retrying)\n",
 238                                         cmd_name, ERR_PTR(ret));
 239                                 continue;
 240                         }
 241
 242                         dev_err(&client->dev,
 243                                 "(%s) I2C transfer failed: %pe\n",
 244                                 cmd_name, ERR_PTR(ret));
 245                         return ret;
 246                 }
 247
 248                 if (ret != ARRAY_SIZE(msgs) ||
 249                     resp[FW_HDR_TYPE] != expected_response) {
 250                         if (--retries > 0) {
 251                                 dev_dbg(&client->dev,
 252                                         "(%s) unexpected response: %*ph (retrying)\n",
 253                                         cmd_name, ret, resp);
 254                                 continue;
 255                         }
 256
 257                         dev_err(&client->dev,
 258                                 "(%s) unexpected response: %*ph\n",
 259                                 cmd_name, ret, resp);
 260                         return -EIO;
 261                 }
 262
 263                 return 0;
 264         }
 265 }
 266
 267 static int elants_i2c_calibrate(struct elants_data *ts)
 268 {
 269         struct i2c_client *client = ts->client;
 270         int ret, error;
 271         static const u8 w_flashkey[] = { 0x54, 0xC0, 0xE1, 0x5A };
 272         static const u8 rek[] = { 0x54, 0x29, 0x00, 0x01 };
 273         static const u8 rek_resp[] = { CMD_HEADER_REK, 0x66, 0x66, 0x66 };
 274
 275         disable_irq(client->irq);
 276
 277         ts->state = ELAN_WAIT_RECALIBRATION;
 278         reinit_completion(&ts->cmd_done);
 279
 280         elants_i2c_send(client, w_flashkey, sizeof(w_flashkey));
 281         elants_i2c_send(client, rek, sizeof(rek));
 282
 283         enable_irq(client->irq);
 284
 285         ret = wait_for_completion_interruptible_timeout(&ts->cmd_done,
 286                                 msecs_to_jiffies(ELAN_CALI_TIMEOUT_MSEC));
 287
 288         ts->state = ELAN_STATE_NORMAL;
 289
 290         if (ret <= 0) {
 291                 error = ret < 0 ? ret : -ETIMEDOUT;
 292                 dev_err(&client->dev,
 293                         "error while waiting for calibration to complete: %d\n",
 294                         error);
 295                 return error;
 296         }
 297
 298         if (memcmp(rek_resp, ts->cmd_resp, sizeof(rek_resp))) {
 299                 dev_err(&client->dev,
 300                         "unexpected calibration response: %*ph\n",
 301                         (int)sizeof(ts->cmd_resp), ts->cmd_resp);
 302                 return -EINVAL;
 303         }
 304
 305         return 0;
 306 }
 307
 308 static int elants_i2c_sw_reset(struct i2c_client *client)
 309 {
 310         const u8 soft_rst_cmd[] = { 0x77, 0x77, 0x77, 0x77 };
 311         int error;
 312
 313         error = elants_i2c_send(client, soft_rst_cmd,
 314                                 sizeof(soft_rst_cmd));
 315         if (error) {
 316                 dev_err(&client->dev, "software reset failed: %d\n", error);
 317                 return error;
 318         }
 319
 320         /*
 321          * We should wait at least 10 msec (but no more than 40) before
 322          * sending fastboot or IAP command to the device.
 323          */
 324         msleep(30);
 325
 326         return 0;
 327 }
 328
 329 static u16 elants_i2c_parse_version(u8 *buf)
 330 {
 331         return get_unaligned_be32(buf) >> 4;
 332 }
 333
 334 static int elants_i2c_query_hw_version(struct elants_data *ts)
 335 {
 336         struct i2c_client *client = ts->client;
 337         int retry_cnt = MAX_RETRIES;
 338         const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 };
 339         u8 resp[HEADER_SIZE];
 340         int error;
 341
 342         while (retry_cnt--) {
 343                 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
 344                                                    resp, sizeof(resp), 1,
 345                                                    "read fw id");
 346                 if (error)
 347                         return error;
 348
 349                 ts->hw_version = elants_i2c_parse_version(resp);
 350                 if (ts->hw_version != 0xffff)
 351                         return 0;
 352         }
 353
 354         dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version);
 355
 356         return -EINVAL;
 357 }
 358
 359 static int elants_i2c_query_fw_version(struct elants_data *ts)
 360 {
 361         struct i2c_client *client = ts->client;
 362         int retry_cnt = MAX_RETRIES;
 363         const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 };
 364         u8 resp[HEADER_SIZE];
 365         int error;
 366
 367         while (retry_cnt--) {
 368                 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
 369                                                    resp, sizeof(resp), 1,
 370                                                    "read fw version");
 371                 if (error)
 372                         return error;
 373
 374                 ts->fw_version = elants_i2c_parse_version(resp);
 375                 if (ts->fw_version != 0x0000 && ts->fw_version != 0xffff)
 376                         return 0;
 377
 378                 dev_dbg(&client->dev, "(read fw version) resp %*phC\n",
 379                         (int)sizeof(resp), resp);
 380         }
 381
 382         dev_err(&client->dev, "Invalid fw ver: %#04x\n", ts->fw_version);
 383
 384         return -EINVAL;
 385 }
 386
 387 static int elants_i2c_query_test_version(struct elants_data *ts)
 388 {
 389         struct i2c_client *client = ts->client;
 390         int error;
 391         u16 version;
 392         const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 };
 393         u8 resp[HEADER_SIZE];
 394
 395         error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
 396                                            resp, sizeof(resp), MAX_RETRIES,
 397                                            "read test version");
 398         if (error) {
 399                 dev_err(&client->dev, "Failed to read test version\n");
 400                 return error;
 401         }
 402
 403         version = elants_i2c_parse_version(resp);
 404         ts->test_version = version >> 8;
 405         ts->solution_version = version & 0xff;
 406
 407         return 0;
 408 }
 409
 410 static int elants_i2c_query_bc_version(struct elants_data *ts)
 411 {
 412         struct i2c_client *client = ts->client;
 413         const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_BC_VER, 0x00, 0x01 };
 414         u8 resp[HEADER_SIZE];
 415         u16 version;
 416         int error;
 417
 418         error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
 419                                            resp, sizeof(resp), 1,
 420                                            "read BC version");
 421         if (error)
 422                 return error;
 423
 424         version = elants_i2c_parse_version(resp);
 425         ts->bc_version = version >> 8;
 426         ts->iap_version = version & 0xff;
 427
 428         return 0;
 429 }
 430
 431 static int elants_i2c_query_ts_info(struct elants_data *ts)
 432 {
 433         struct i2c_client *client = ts->client;
 434         int error;
 435         u8 resp[17];
 436         u16 phy_x, phy_y, rows, cols, osr;
 437         const u8 get_resolution_cmd[] = {
 438                 CMD_HEADER_6B_READ, 0x00, 0x00, 0x00, 0x00, 0x00
 439         };
 440         const u8 get_osr_cmd[] = {
 441                 CMD_HEADER_READ, E_INFO_OSR, 0x00, 0x01
 442         };
 443         const u8 get_physical_scan_cmd[] = {
 444                 CMD_HEADER_READ, E_INFO_PHY_SCAN, 0x00, 0x01
 445         };
 446         const u8 get_physical_drive_cmd[] = {
 447                 CMD_HEADER_READ, E_INFO_PHY_DRIVER, 0x00, 0x01
 448         };
 449
 450         /* Get trace number */
 451         error = elants_i2c_execute_command(client,
 452                                            get_resolution_cmd,
 453                                            sizeof(get_resolution_cmd),
 454                                            resp, sizeof(resp), 1,
 455                                            "get resolution");
 456         if (error)
 457                 return error;
 458
 459         rows = resp[2] + resp[6] + resp[10];
 460         cols = resp[3] + resp[7] + resp[11];
 461
 462         /* Process mm_to_pixel information */
 463         error = elants_i2c_execute_command(client,
 464                                            get_osr_cmd, sizeof(get_osr_cmd),
 465                                            resp, sizeof(resp), 1, "get osr");
 466         if (error)
 467                 return error;
 468
 469         osr = resp[3];
 470
 471         error = elants_i2c_execute_command(client,
 472                                            get_physical_scan_cmd,
 473                                            sizeof(get_physical_scan_cmd),
 474                                            resp, sizeof(resp), 1,
 475                                            "get physical scan");
 476         if (error)
 477                 return error;
 478
 479         phy_x = get_unaligned_be16(&resp[2]);
 480
 481         error = elants_i2c_execute_command(client,
 482                                            get_physical_drive_cmd,
 483                                            sizeof(get_physical_drive_cmd),
 484                                            resp, sizeof(resp), 1,
 485                                            "get physical drive");
 486         if (error)
 487                 return error;
 488
 489         phy_y = get_unaligned_be16(&resp[2]);
 490
 491         dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y);
 492
 493         if (rows == 0 || cols == 0 || osr == 0) {
 494                 dev_warn(&client->dev,
 495                          "invalid trace number data: %d, %d, %d\n",
 496                          rows, cols, osr);
 497         } else {
 498                 /* translate trace number to TS resolution */
 499                 ts->x_max = ELAN_TS_RESOLUTION(rows, osr);
 500                 ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x);
 501                 ts->y_max = ELAN_TS_RESOLUTION(cols, osr);
 502                 ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y);
 503         }
 504
 505         return 0;
 506 }
 507
 508 static int elants_i2c_fastboot(struct i2c_client *client)
 509 {
 510         const u8 boot_cmd[] = { 0x4D, 0x61, 0x69, 0x6E };
 511         int error;
 512
 513         error = elants_i2c_send(client, boot_cmd, sizeof(boot_cmd));
 514         if (error) {
 515                 dev_err(&client->dev, "boot failed: %d\n", error);
 516                 return error;
 517         }
 518
 519         dev_dbg(&client->dev, "boot success -- 0x%x\n", client->addr);
 520         return 0;
 521 }
 522
 523 static int elants_i2c_initialize(struct elants_data *ts)
 524 {
 525         struct i2c_client *client = ts->client;
 526         int error, error2, retry_cnt;
 527         const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 };
 528         const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 };
 529         u8 buf[HEADER_SIZE];
 530
 531         for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
 532                 error = elants_i2c_sw_reset(client);
 533                 if (error) {
 534                         /* Continue initializing if it's the last try */
 535                         if (retry_cnt < MAX_RETRIES - 1)
 536                                 continue;
 537                 }
 538
 539                 error = elants_i2c_fastboot(client);
 540                 if (error) {
 541                         /* Continue initializing if it's the last try */
 542                         if (retry_cnt < MAX_RETRIES - 1)
 543                                 continue;
 544                 }
 545
 546                 /* Wait for Hello packet */
 547                 msleep(BOOT_TIME_DELAY_MS);
 548
 549                 error = elants_i2c_read(client, buf, sizeof(buf));
 550                 if (error) {
 551                         dev_err(&client->dev,
 552                                 "failed to read 'hello' packet: %d\n", error);
 553                 } else if (!memcmp(buf, hello_packet, sizeof(hello_packet))) {
 554                         ts->iap_mode = ELAN_IAP_OPERATIONAL;
 555                         break;
 556                 } else if (!memcmp(buf, recov_packet, sizeof(recov_packet))) {
 557                         /*
 558                          * Setting error code will mark device
 559                          * in recovery mode below.
 560                          */
 561                         error = -EIO;
 562                         break;
 563                 } else {
 564                         error = -EINVAL;
 565                         dev_err(&client->dev,
 566                                 "invalid 'hello' packet: %*ph\n",
 567                                 (int)sizeof(buf), buf);
 568                 }
 569         }
 570
 571         /* hw version is available even if device in recovery state */
 572         error2 = elants_i2c_query_hw_version(ts);
 573         if (!error2)
 574                 error2 = elants_i2c_query_bc_version(ts);
 575         if (!error)
 576                 error = error2;
 577
 578         if (!error)
 579                 error = elants_i2c_query_fw_version(ts);
 580         if (!error)
 581                 error = elants_i2c_query_test_version(ts);
 582         if (!error)
 583                 error = elants_i2c_query_ts_info(ts);
 584
 585         if (error)
 586                 ts->iap_mode = ELAN_IAP_RECOVERY;
 587
 588         return 0;
 589 }
 590
 591 /*
 592  * Firmware update interface.
 593  */
 594
 595 static int elants_i2c_fw_write_page(struct i2c_client *client,
 596                                     const void *page)
 597 {
 598         const u8 ack_ok[] = { 0xaa, 0xaa };
 599         u8 buf[2];
 600         int retry;
 601         int error;
 602
 603         for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) {
 604                 error = elants_i2c_send(client, page, ELAN_FW_PAGESIZE);
 605                 if (error) {
 606                         dev_err(&client->dev,
 607                                 "IAP Write Page failed: %d\n", error);
 608                         continue;
 609                 }
 610
 611                 error = elants_i2c_read(client, buf, 2);
 612                 if (error) {
 613                         dev_err(&client->dev,
 614                                 "IAP Ack read failed: %d\n", error);
 615                         return error;
 616                 }
 617
 618                 if (!memcmp(buf, ack_ok, sizeof(ack_ok)))
 619                         return 0;
 620
 621                 error = -EIO;
 622                 dev_err(&client->dev,
 623                         "IAP Get Ack Error [%02x:%02x]\n",
 624                         buf[0], buf[1]);
 625         }
 626
 627         return error;
 628 }
 629
 630 static int elants_i2c_validate_remark_id(struct elants_data *ts,
 631                                          const struct firmware *fw)
 632 {
 633         struct i2c_client *client = ts->client;
 634         int error;
 635         const u8 cmd[] = { CMD_HEADER_ROM_READ, 0x80, 0x1F, 0x00, 0x00, 0x21 };
 636         u8 resp[6] = { 0 };
 637         u16 ts_remark_id = 0;
 638         u16 fw_remark_id = 0;
 639
 640         /* Compare TS Remark ID and FW Remark ID */
 641         error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
 642                                            resp, sizeof(resp),
 643                                            1, "read Remark ID");
 644         if (error)
 645                 return error;
 646
 647         ts_remark_id = get_unaligned_be16(&resp[3]);
 648
 649         fw_remark_id = get_unaligned_le16(&fw->data[fw->size - 4]);
 650
 651         if (fw_remark_id != ts_remark_id) {
 652                 dev_err(&client->dev,
 653                         "Remark ID Mismatched: ts_remark_id=0x%04x, fw_remark_id=0x%04x.\n",
 654                         ts_remark_id, fw_remark_id);
 655                 return -EINVAL;
 656         }
 657
 658         return 0;
 659 }
 660
 661 static int elants_i2c_do_update_firmware(struct i2c_client *client,
 662                                          const struct firmware *fw,
 663                                          bool force)
 664 {
 665         struct elants_data *ts = i2c_get_clientdata(client);
 666         const u8 enter_iap[] = { 0x45, 0x49, 0x41, 0x50 };
 667         const u8 enter_iap2[] = { 0x54, 0x00, 0x12, 0x34 };
 668         const u8 iap_ack[] = { 0x55, 0xaa, 0x33, 0xcc };
 669         const u8 close_idle[] = { 0x54, 0x2c, 0x01, 0x01 };
 670         u8 buf[HEADER_SIZE];
 671         u16 send_id;
 672         int page, n_fw_pages;
 673         int error;
 674         bool check_remark_id = ts->iap_version >= 0x60;
 675
 676         /* Recovery mode detection! */
 677         if (force) {
 678                 dev_dbg(&client->dev, "Recovery mode procedure\n");
 679
 680                 if (check_remark_id) {
 681                         error = elants_i2c_validate_remark_id(ts, fw);
 682                         if (error)
 683                                 return error;
 684                 }
 685
 686                 error = elants_i2c_send(client, enter_iap2, sizeof(enter_iap2));
 687                 if (error) {
 688                         dev_err(&client->dev, "failed to enter IAP mode: %d\n",
 689                                 error);
 690                         return error;
 691                 }
 692         } else {
 693                 /* Start IAP Procedure */
 694                 dev_dbg(&client->dev, "Normal IAP procedure\n");
 695
 696                 /* Close idle mode */
 697                 error = elants_i2c_send(client, close_idle, sizeof(close_idle));
 698                 if (error)
 699                         dev_err(&client->dev, "Failed close idle: %d\n", error);
 700                 msleep(60);
 701
 702                 elants_i2c_sw_reset(client);
 703                 msleep(20);
 704
 705                 if (check_remark_id) {
 706                         error = elants_i2c_validate_remark_id(ts, fw);
 707                         if (error)
 708                                 return error;
 709                 }
 710
 711                 error = elants_i2c_send(client, enter_iap, sizeof(enter_iap));
 712                 if (error) {
 713                         dev_err(&client->dev, "failed to enter IAP mode: %d\n",
 714                                 error);
 715                         return error;
 716                 }
 717         }
 718
 719         msleep(20);
 720
 721         /* check IAP state */
 722         error = elants_i2c_read(client, buf, 4);
 723         if (error) {
 724                 dev_err(&client->dev,
 725                         "failed to read IAP acknowledgement: %d\n",
 726                         error);
 727                 return error;
 728         }
 729
 730         if (memcmp(buf, iap_ack, sizeof(iap_ack))) {
 731                 dev_err(&client->dev,
 732                         "failed to enter IAP: %*ph (expected %*ph)\n",
 733                         (int)sizeof(buf), buf, (int)sizeof(iap_ack), iap_ack);
 734                 return -EIO;
 735         }
 736
 737         dev_info(&client->dev, "successfully entered IAP mode");
 738
 739         send_id = client->addr;
 740         error = elants_i2c_send(client, &send_id, 1);
 741         if (error) {
 742                 dev_err(&client->dev, "sending dummy byte failed: %d\n",
 743                         error);
 744                 return error;
 745         }
 746
 747         /* Clear the last page of Master */
 748         error = elants_i2c_send(client, fw->data, ELAN_FW_PAGESIZE);
 749         if (error) {
 750                 dev_err(&client->dev, "clearing of the last page failed: %d\n",
 751                         error);
 752                 return error;
 753         }
 754
 755         error = elants_i2c_read(client, buf, 2);
 756         if (error) {
 757                 dev_err(&client->dev,
 758                         "failed to read ACK for clearing the last page: %d\n",
 759                         error);
 760                 return error;
 761         }
 762
 763         n_fw_pages = fw->size / ELAN_FW_PAGESIZE;
 764         dev_dbg(&client->dev, "IAP Pages = %d\n", n_fw_pages);
 765
 766         for (page = 0; page < n_fw_pages; page++) {
 767                 error = elants_i2c_fw_write_page(client,
 768                                         fw->data + page * ELAN_FW_PAGESIZE);
 769                 if (error) {
 770                         dev_err(&client->dev,
 771                                 "failed to write FW page %d: %d\n",
 772                                 page, error);
 773                         return error;
 774                 }
 775         }
 776
 777         /* Old iap needs to wait 200ms for WDT and rest is for hello packets */
 778         msleep(300);
 779
 780         dev_info(&client->dev, "firmware update completed\n");
 781         return 0;
 782 }
 783
 784 static int elants_i2c_fw_update(struct elants_data *ts)
 785 {
 786         struct i2c_client *client = ts->client;
 787         const struct firmware *fw;
 788         char *fw_name;
 789         int error;
 790
 791         fw_name = kasprintf(GFP_KERNEL, "elants_i2c_%04x.bin", ts->hw_version);
 792         if (!fw_name)
 793                 return -ENOMEM;
 794
 795         dev_info(&client->dev, "requesting fw name = %s\n", fw_name);
 796         error = request_firmware(&fw, fw_name, &client->dev);
 797         kfree(fw_name);
 798         if (error) {
 799                 dev_err(&client->dev, "failed to request firmware: %d\n",
 800                         error);
 801                 return error;
 802         }
 803
 804         if (fw->size % ELAN_FW_PAGESIZE) {
 805                 dev_err(&client->dev, "invalid firmware length: %zu\n",
 806                         fw->size);
 807                 error = -EINVAL;
 808                 goto out;
 809         }
 810
 811         disable_irq(client->irq);
 812
 813         error = elants_i2c_do_update_firmware(client, fw,
 814                                         ts->iap_mode == ELAN_IAP_RECOVERY);
 815         if (error) {
 816                 dev_err(&client->dev, "firmware update failed: %d\n", error);
 817                 ts->iap_mode = ELAN_IAP_RECOVERY;
 818                 goto out_enable_irq;
 819         }
 820
 821         error = elants_i2c_initialize(ts);
 822         if (error) {
 823                 dev_err(&client->dev,
 824                         "failed to initialize device after firmware update: %d\n",
 825                         error);
 826                 ts->iap_mode = ELAN_IAP_RECOVERY;
 827                 goto out_enable_irq;
 828         }
 829
 830         ts->iap_mode = ELAN_IAP_OPERATIONAL;
 831
 832 out_enable_irq:
 833         ts->state = ELAN_STATE_NORMAL;
 834         enable_irq(client->irq);
 835         msleep(100);
 836
 837         if (!error)
 838                 elants_i2c_calibrate(ts);
 839 out:
 840         release_firmware(fw);
 841         return error;
 842 }
 843
 844 /*
 845  * Event reporting.
 846  */
 847
 848 static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf)
 849 {
 850         struct input_dev *input = ts->input;
 851         unsigned int n_fingers;
 852         unsigned int tool_type;
 853         u16 finger_state;
 854         int i;
 855
 856         n_fingers = buf[FW_POS_STATE + 1] & 0x0f;
 857         finger_state = ((buf[FW_POS_STATE + 1] & 0x30) << 4) |
 858                         buf[FW_POS_STATE];
 859
 860         dev_dbg(&ts->client->dev,
 861                 "n_fingers: %u, state: %04x\n",  n_fingers, finger_state);
 862
 863         /* Note: all fingers have the same tool type */
 864         tool_type = buf[FW_POS_TOOL_TYPE] & BIT(0) ?
 865                         MT_TOOL_FINGER : MT_TOOL_PALM;
 866
 867         for (i = 0; i < MAX_CONTACT_NUM && n_fingers; i++) {
 868                 if (finger_state & 1) {
 869                         unsigned int x, y, p, w;
 870                         u8 *pos;
 871
 872                         pos = &buf[FW_POS_XY + i * 3];
 873                         x = (((u16)pos[0] & 0xf0) << 4) | pos[1];
 874                         y = (((u16)pos[0] & 0x0f) << 8) | pos[2];
 875                         p = buf[FW_POS_PRESSURE + i];
 876                         w = buf[FW_POS_WIDTH + i];
 877
 878                         dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n",
 879                                 i, x, y, p, w);
 880
 881                         input_mt_slot(input, i);
 882                         input_mt_report_slot_state(input, tool_type, true);
 883                         touchscreen_report_pos(input, &ts->prop, x, y, true);
 884                         input_event(input, EV_ABS, ABS_MT_PRESSURE, p);
 885                         input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w);
 886
 887                         n_fingers--;
 888                 }
 889
 890                 finger_state >>= 1;
 891         }
 892
 893         input_mt_sync_frame(input);
 894         input_sync(input);
 895 }
 896
 897 static u8 elants_i2c_calculate_checksum(u8 *buf)
 898 {
 899         u8 checksum = 0;
 900         u8 i;
 901
 902         for (i = 0; i < FW_POS_CHECKSUM; i++)
 903                 checksum += buf[i];
 904
 905         return checksum;
 906 }
 907
 908 static void elants_i2c_event(struct elants_data *ts, u8 *buf)
 909 {
 910         u8 checksum = elants_i2c_calculate_checksum(buf);
 911
 912         if (unlikely(buf[FW_POS_CHECKSUM] != checksum))
 913                 dev_warn(&ts->client->dev,
 914                          "%s: invalid checksum for packet %02x: %02x vs. %02x\n",
 915                          __func__, buf[FW_POS_HEADER],
 916                          checksum, buf[FW_POS_CHECKSUM]);
 917         else if (unlikely(buf[FW_POS_HEADER] != HEADER_REPORT_10_FINGER))
 918                 dev_warn(&ts->client->dev,
 919                          "%s: unknown packet type: %02x\n",
 920                          __func__, buf[FW_POS_HEADER]);
 921         else
 922                 elants_i2c_mt_event(ts, buf);
 923 }
 924
 925 static irqreturn_t elants_i2c_irq(int irq, void *_dev)
 926 {
 927         const u8 wait_packet[] = { 0x64, 0x64, 0x64, 0x64 };
 928         struct elants_data *ts = _dev;
 929         struct i2c_client *client = ts->client;
 930         int report_count, report_len;
 931         int i;
 932         int len;
 933
 934         len = i2c_master_recv_dmasafe(client, ts->buf, sizeof(ts->buf));
 935         if (len < 0) {
 936                 dev_err(&client->dev, "%s: failed to read data: %d\n",
 937                         __func__, len);
 938                 goto out;
 939         }
 940
 941         dev_dbg(&client->dev, "%s: packet %*ph\n",
 942                 __func__, HEADER_SIZE, ts->buf);
 943
 944         switch (ts->state) {
 945         case ELAN_WAIT_RECALIBRATION:
 946                 if (ts->buf[FW_HDR_TYPE] == CMD_HEADER_REK) {
 947                         memcpy(ts->cmd_resp, ts->buf, sizeof(ts->cmd_resp));
 948                         complete(&ts->cmd_done);
 949                         ts->state = ELAN_STATE_NORMAL;
 950                 }
 951                 break;
 952
 953         case ELAN_WAIT_QUEUE_HEADER:
 954                 if (ts->buf[FW_HDR_TYPE] != QUEUE_HEADER_NORMAL)
 955                         break;
 956
 957                 ts->state = ELAN_STATE_NORMAL;
 958                 fallthrough;
 959
 960         case ELAN_STATE_NORMAL:
 961
 962                 switch (ts->buf[FW_HDR_TYPE]) {
 963                 case CMD_HEADER_HELLO:
 964                 case CMD_HEADER_RESP:
 965                 case CMD_HEADER_REK:
 966                         break;
 967
 968                 case QUEUE_HEADER_WAIT:
 969                         if (memcmp(ts->buf, wait_packet, sizeof(wait_packet))) {
 970                                 dev_err(&client->dev,
 971                                         "invalid wait packet %*ph\n",
 972                                         HEADER_SIZE, ts->buf);
 973                         } else {
 974                                 ts->state = ELAN_WAIT_QUEUE_HEADER;
 975                                 udelay(30);
 976                         }
 977                         break;
 978
 979                 case QUEUE_HEADER_SINGLE:
 980                         elants_i2c_event(ts, &ts->buf[HEADER_SIZE]);
 981                         break;
 982
 983                 case QUEUE_HEADER_NORMAL:
 984                         report_count = ts->buf[FW_HDR_COUNT];
 985                         if (report_count == 0 || report_count > 3) {
 986                                 dev_err(&client->dev,
 987                                         "bad report count: %*ph\n",
 988                                         HEADER_SIZE, ts->buf);
 989                                 break;
 990                         }
 991
 992                         report_len = ts->buf[FW_HDR_LENGTH] / report_count;
 993                         if (report_len != PACKET_SIZE) {
 994                                 dev_err(&client->dev,
 995                                         "mismatching report length: %*ph\n",
 996                                         HEADER_SIZE, ts->buf);
 997                                 break;
 998                         }
 999
1000                         for (i = 0; i < report_count; i++) {
1001                                 u8 *buf = ts->buf + HEADER_SIZE +
1002                                                         i * PACKET_SIZE;
1003                                 elants_i2c_event(ts, buf);
1004                         }
1005                         break;
1006
1007                 default:
1008                         dev_err(&client->dev, "unknown packet %*ph\n",
1009                                 HEADER_SIZE, ts->buf);
1010                         break;
1011                 }
1012                 break;
1013         }
1014
1015 out:
1016         return IRQ_HANDLED;
1017 }
1018
1019 /*
1020  * sysfs interface
1021  */
1022 static ssize_t calibrate_store(struct device *dev,
1023                                struct device_attribute *attr,
1024                                const char *buf, size_t count)
1025 {
1026         struct i2c_client *client = to_i2c_client(dev);
1027         struct elants_data *ts = i2c_get_clientdata(client);
1028         int error;
1029
1030         error = mutex_lock_interruptible(&ts->sysfs_mutex);
1031         if (error)
1032                 return error;
1033
1034         error = elants_i2c_calibrate(ts);
1035
1036         mutex_unlock(&ts->sysfs_mutex);
1037         return error ?: count;
1038 }
1039
1040 static ssize_t write_update_fw(struct device *dev,
1041                                struct device_attribute *attr,
1042                                const char *buf, size_t count)
1043 {
1044         struct i2c_client *client = to_i2c_client(dev);
1045         struct elants_data *ts = i2c_get_clientdata(client);
1046         int error;
1047
1048         error = mutex_lock_interruptible(&ts->sysfs_mutex);
1049         if (error)
1050                 return error;
1051
1052         error = elants_i2c_fw_update(ts);
1053         dev_dbg(dev, "firmware update result: %d\n", error);
1054
1055         mutex_unlock(&ts->sysfs_mutex);
1056         return error ?: count;
1057 }
1058
1059 static ssize_t show_iap_mode(struct device *dev,
1060                              struct device_attribute *attr, char *buf)
1061 {
1062         struct i2c_client *client = to_i2c_client(dev);
1063         struct elants_data *ts = i2c_get_clientdata(client);
1064
1065         return sprintf(buf, "%s\n",
1066                        ts->iap_mode == ELAN_IAP_OPERATIONAL ?
1067                                 "Normal" : "Recovery");
1068 }
1069
1070 static ssize_t show_calibration_count(struct device *dev,
1071                                       struct device_attribute *attr, char *buf)
1072 {
1073         struct i2c_client *client = to_i2c_client(dev);
1074         const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_REK, 0x00, 0x01 };
1075         u8 resp[HEADER_SIZE];
1076         u16 rek_count;
1077         int error;
1078
1079         error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
1080                                            resp, sizeof(resp), 1,
1081                                            "read ReK status");
1082         if (error)
1083                 return sprintf(buf, "%d\n", error);
1084
1085         rek_count = get_unaligned_be16(&resp[2]);
1086         return sprintf(buf, "0x%04x\n", rek_count);
1087 }
1088
1089 static DEVICE_ATTR_WO(calibrate);
1090 static DEVICE_ATTR(iap_mode, S_IRUGO, show_iap_mode, NULL);
1091 static DEVICE_ATTR(calibration_count, S_IRUGO, show_calibration_count, NULL);
1092 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw);
1093
1094 struct elants_version_attribute {
1095         struct device_attribute dattr;
1096         size_t field_offset;
1097         size_t field_size;
1098 };
1099
1100 #define __ELANTS_FIELD_SIZE(_field)                                     \
1101         sizeof(((struct elants_data *)NULL)->_field)
1102 #define __ELANTS_VERIFY_SIZE(_field)                                    \
1103         (BUILD_BUG_ON_ZERO(__ELANTS_FIELD_SIZE(_field) > 2) +           \
1104          __ELANTS_FIELD_SIZE(_field))
1105 #define ELANTS_VERSION_ATTR(_field)                                     \
1106         struct elants_version_attribute elants_ver_attr_##_field = {    \
1107                 .dattr = __ATTR(_field, S_IRUGO,                        \
1108                                 elants_version_attribute_show, NULL),   \
1109                 .field_offset = offsetof(struct elants_data, _field),   \
1110                 .field_size = __ELANTS_VERIFY_SIZE(_field),             \
1111         }
1112
1113 static ssize_t elants_version_attribute_show(struct device *dev,
1114                                              struct device_attribute *dattr,
1115                                              char *buf)
1116 {
1117         struct i2c_client *client = to_i2c_client(dev);
1118         struct elants_data *ts = i2c_get_clientdata(client);
1119         struct elants_version_attribute *attr =
1120                 container_of(dattr, struct elants_version_attribute, dattr);
1121         u8 *field = (u8 *)((char *)ts + attr->field_offset);
1122         unsigned int fmt_size;
1123         unsigned int val;
1124
1125         if (attr->field_size == 1) {
1126                 val = *field;
1127                 fmt_size = 2; /* 2 HEX digits */
1128         } else {
1129                 val = *(u16 *)field;
1130                 fmt_size = 4; /* 4 HEX digits */
1131         }
1132
1133         return sprintf(buf, "%0*x\n", fmt_size, val);
1134 }
1135
1136 static ELANTS_VERSION_ATTR(fw_version);
1137 static ELANTS_VERSION_ATTR(hw_version);
1138 static ELANTS_VERSION_ATTR(test_version);
1139 static ELANTS_VERSION_ATTR(solution_version);
1140 static ELANTS_VERSION_ATTR(bc_version);
1141 static ELANTS_VERSION_ATTR(iap_version);
1142
1143 static struct attribute *elants_attributes[] = {
1144         &dev_attr_calibrate.attr,
1145         &dev_attr_update_fw.attr,
1146         &dev_attr_iap_mode.attr,
1147         &dev_attr_calibration_count.attr,
1148
1149         &elants_ver_attr_fw_version.dattr.attr,
1150         &elants_ver_attr_hw_version.dattr.attr,
1151         &elants_ver_attr_test_version.dattr.attr,
1152         &elants_ver_attr_solution_version.dattr.attr,
1153         &elants_ver_attr_bc_version.dattr.attr,
1154         &elants_ver_attr_iap_version.dattr.attr,
1155         NULL
1156 };
1157
1158 static const struct attribute_group elants_attribute_group = {
1159         .attrs = elants_attributes,
1160 };
1161
1162 static int elants_i2c_power_on(struct elants_data *ts)
1163 {
1164         int error;
1165
1166         /*
1167          * If we do not have reset gpio assume platform firmware
1168          * controls regulators and does power them on for us.
1169          */
1170         if (IS_ERR_OR_NULL(ts->reset_gpio))
1171                 return 0;
1172
1173         gpiod_set_value_cansleep(ts->reset_gpio, 1);
1174
1175         error = regulator_enable(ts->vcc33);
1176         if (error) {
1177                 dev_err(&ts->client->dev,
1178                         "failed to enable vcc33 regulator: %d\n",
1179                         error);
1180                 goto release_reset_gpio;
1181         }
1182
1183         error = regulator_enable(ts->vccio);
1184         if (error) {
1185                 dev_err(&ts->client->dev,
1186                         "failed to enable vccio regulator: %d\n",
1187                         error);
1188                 regulator_disable(ts->vcc33);
1189                 goto release_reset_gpio;
1190         }
1191
1192         /*
1193          * We need to wait a bit after powering on controller before
1194          * we are allowed to release reset GPIO.
1195          */
1196         udelay(ELAN_POWERON_DELAY_USEC);
1197
1198 release_reset_gpio:
1199         gpiod_set_value_cansleep(ts->reset_gpio, 0);
1200         if (error)
1201                 return error;
1202
1203         msleep(ELAN_RESET_DELAY_MSEC);
1204
1205         return 0;
1206 }
1207
1208 static void elants_i2c_power_off(void *_data)
1209 {
1210         struct elants_data *ts = _data;
1211
1212         if (!IS_ERR_OR_NULL(ts->reset_gpio)) {
1213                 /*
1214                  * Activate reset gpio to prevent leakage through the
1215                  * pin once we shut off power to the controller.
1216                  */
1217                 gpiod_set_value_cansleep(ts->reset_gpio, 1);
1218                 regulator_disable(ts->vccio);
1219                 regulator_disable(ts->vcc33);
1220         }
1221 }
1222
1223 static int elants_i2c_probe(struct i2c_client *client,
1224                             const struct i2c_device_id *id)
1225 {
1226         union i2c_smbus_data dummy;
1227         struct elants_data *ts;
1228         unsigned long irqflags;
1229         int error;
1230
1231         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1232                 dev_err(&client->dev,
1233                         "%s: i2c check functionality error\n", DEVICE_NAME);
1234                 return -ENXIO;
1235         }
1236
1237         ts = devm_kzalloc(&client->dev, sizeof(struct elants_data), GFP_KERNEL);
1238         if (!ts)
1239                 return -ENOMEM;
1240
1241         mutex_init(&ts->sysfs_mutex);
1242         init_completion(&ts->cmd_done);
1243
1244         ts->client = client;
1245         i2c_set_clientdata(client, ts);
1246
1247         ts->vcc33 = devm_regulator_get(&client->dev, "vcc33");
1248         if (IS_ERR(ts->vcc33)) {
1249                 error = PTR_ERR(ts->vcc33);
1250                 if (error != -EPROBE_DEFER)
1251                         dev_err(&client->dev,
1252                                 "Failed to get 'vcc33' regulator: %d\n",
1253                                 error);
1254                 return error;
1255         }
1256
1257         ts->vccio = devm_regulator_get(&client->dev, "vccio");
1258         if (IS_ERR(ts->vccio)) {
1259                 error = PTR_ERR(ts->vccio);
1260                 if (error != -EPROBE_DEFER)
1261                         dev_err(&client->dev,
1262                                 "Failed to get 'vccio' regulator: %d\n",
1263                                 error);
1264                 return error;
1265         }
1266
1267         ts->reset_gpio = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW);
1268         if (IS_ERR(ts->reset_gpio)) {
1269                 error = PTR_ERR(ts->reset_gpio);
1270
1271                 if (error == -EPROBE_DEFER)
1272                         return error;
1273
1274                 if (error != -ENOENT && error != -ENOSYS) {
1275                         dev_err(&client->dev,
1276                                 "failed to get reset gpio: %d\n",
1277                                 error);
1278                         return error;
1279                 }
1280
1281                 ts->keep_power_in_suspend = true;
1282         }
1283
1284         error = elants_i2c_power_on(ts);
1285         if (error)
1286                 return error;
1287
1288         error = devm_add_action(&client->dev, elants_i2c_power_off, ts);
1289         if (error) {
1290                 dev_err(&client->dev,
1291                         "failed to install power off action: %d\n", error);
1292                 elants_i2c_power_off(ts);
1293                 return error;
1294         }
1295
1296         /* Make sure there is something at this address */
1297         if (i2c_smbus_xfer(client->adapter, client->addr, 0,
1298                            I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) {
1299                 dev_err(&client->dev, "nothing at this address\n");
1300                 return -ENXIO;
1301         }
1302
1303         error = elants_i2c_initialize(ts);
1304         if (error) {
1305                 dev_err(&client->dev, "failed to initialize: %d\n", error);
1306                 return error;
1307         }
1308
1309         ts->input = devm_input_allocate_device(&client->dev);
1310         if (!ts->input) {
1311                 dev_err(&client->dev, "Failed to allocate input device\n");
1312                 return -ENOMEM;
1313         }
1314
1315         ts->input->name = "Elan Touchscreen";
1316         ts->input->id.bustype = BUS_I2C;
1317
1318         /* Multitouch input params setup */
1319
1320         input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0);
1321         input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0);
1322         input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
1323         input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
1324         input_set_abs_params(ts->input, ABS_MT_TOOL_TYPE,
1325                              0, MT_TOOL_PALM, 0, 0);
1326         input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res);
1327         input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res);
1328
1329         touchscreen_parse_properties(ts->input, true, &ts->prop);
1330
1331         error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM,
1332                                     INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
1333         if (error) {
1334                 dev_err(&client->dev,
1335                         "failed to initialize MT slots: %d\n", error);
1336                 return error;
1337         }
1338
1339         error = input_register_device(ts->input);
1340         if (error) {
1341                 dev_err(&client->dev,
1342                         "unable to register input device: %d\n", error);
1343                 return error;
1344         }
1345
1346         /*
1347          * Platform code (ACPI, DTS) should normally set up interrupt
1348          * for us, but in case it did not let's fall back to using falling
1349          * edge to be compatible with older Chromebooks.
1350          */
1351         irqflags = irq_get_trigger_type(client->irq);
1352         if (!irqflags)
1353                 irqflags = IRQF_TRIGGER_FALLING;
1354
1355         error = devm_request_threaded_irq(&client->dev, client->irq,
1356                                           NULL, elants_i2c_irq,
1357                                           irqflags | IRQF_ONESHOT,
1358                                           client->name, ts);
1359         if (error) {
1360                 dev_err(&client->dev, "Failed to register interrupt\n");
1361                 return error;
1362         }
1363
1364         /*
1365          * Systems using device tree should set up wakeup via DTS,
1366          * the rest will configure device as wakeup source by default.
1367          */
1368         if (!client->dev.of_node)
1369                 device_init_wakeup(&client->dev, true);
1370
1371         error = devm_device_add_group(&client->dev, &elants_attribute_group);
1372         if (error) {
1373                 dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
1374                         error);
1375                 return error;
1376         }
1377
1378         return 0;
1379 }
1380
1381 static int __maybe_unused elants_i2c_suspend(struct device *dev)
1382 {
1383         struct i2c_client *client = to_i2c_client(dev);
1384         struct elants_data *ts = i2c_get_clientdata(client);
1385         const u8 set_sleep_cmd[] = { 0x54, 0x50, 0x00, 0x01 };
1386         int retry_cnt;
1387         int error;
1388
1389         /* Command not support in IAP recovery mode */
1390         if (ts->iap_mode != ELAN_IAP_OPERATIONAL)
1391                 return -EBUSY;
1392
1393         disable_irq(client->irq);
1394
1395         if (device_may_wakeup(dev)) {
1396                 /*
1397                  * The device will automatically enter idle mode
1398                  * that has reduced power consumption.
1399                  */
1400                 ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0);
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_sleep_cmd,
1404                                                 sizeof(set_sleep_cmd));
1405                         if (!error)
1406                                 break;
1407
1408                         dev_err(&client->dev,
1409                                 "suspend command failed: %d\n", error);
1410                 }
1411         } else {
1412                 elants_i2c_power_off(ts);
1413         }
1414
1415         return 0;
1416 }
1417
1418 static int __maybe_unused elants_i2c_resume(struct device *dev)
1419 {
1420         struct i2c_client *client = to_i2c_client(dev);
1421         struct elants_data *ts = i2c_get_clientdata(client);
1422         const u8 set_active_cmd[] = { 0x54, 0x58, 0x00, 0x01 };
1423         int retry_cnt;
1424         int error;
1425
1426         if (device_may_wakeup(dev)) {
1427                 if (ts->wake_irq_enabled)
1428                         disable_irq_wake(client->irq);
1429                 elants_i2c_sw_reset(client);
1430         } else if (ts->keep_power_in_suspend) {
1431                 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
1432                         error = elants_i2c_send(client, set_active_cmd,
1433                                                 sizeof(set_active_cmd));
1434                         if (!error)
1435                                 break;
1436
1437                         dev_err(&client->dev,
1438                                 "resume command failed: %d\n", error);
1439                 }
1440         } else {
1441                 elants_i2c_power_on(ts);
1442                 elants_i2c_initialize(ts);
1443         }
1444
1445         ts->state = ELAN_STATE_NORMAL;
1446         enable_irq(client->irq);
1447
1448         return 0;
1449 }
1450
1451 static SIMPLE_DEV_PM_OPS(elants_i2c_pm_ops,
1452                          elants_i2c_suspend, elants_i2c_resume);
1453
1454 static const struct i2c_device_id elants_i2c_id[] = {
1455         { DEVICE_NAME, 0 },
1456         { }
1457 };
1458 MODULE_DEVICE_TABLE(i2c, elants_i2c_id);
1459
1460 #ifdef CONFIG_ACPI
1461 static const struct acpi_device_id elants_acpi_id[] = {
1462         { "ELAN0001", 0 },
1463         { }
1464 };
1465 MODULE_DEVICE_TABLE(acpi, elants_acpi_id);
1466 #endif
1467
1468 #ifdef CONFIG_OF
1469 static const struct of_device_id elants_of_match[] = {
1470         { .compatible = "elan,ekth3500" },
1471         { /* sentinel */ }
1472 };
1473 MODULE_DEVICE_TABLE(of, elants_of_match);
1474 #endif
1475
1476 static struct i2c_driver elants_i2c_driver = {
1477         .probe = elants_i2c_probe,
1478         .id_table = elants_i2c_id,
1479         .driver = {
1480                 .name = DEVICE_NAME,
1481                 .pm = &elants_i2c_pm_ops,
1482                 .acpi_match_table = ACPI_PTR(elants_acpi_id),
1483                 .of_match_table = of_match_ptr(elants_of_match),
1484                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1485         },
1486 };
1487 module_i2c_driver(elants_i2c_driver);
1488
1489 MODULE_AUTHOR("Scott Liu <scott.liu@emc.com.tw>");
1490 MODULE_DESCRIPTION("Elan I2c Touchscreen driver");
1491 MODULE_LICENSE("GPL");