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/module.h>
  23 #include <linux/input.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/irq.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/async.h>
  28 #include <linux/i2c.h>
  29 #include <linux/delay.h>
  30 #include <linux/uaccess.h>
  31 #include <linux/buffer_head.h>
  32 #include <linux/slab.h>
  33 #include <linux/firmware.h>
  34 #include <linux/input/mt.h>
  35 #include <linux/acpi.h>
  36 #include <linux/of.h>
  37 #include <linux/gpio/consumer.h>
  38 #include <linux/regulator/consumer.h>
  39 #include <asm/unaligned.h>
  40
  41 /* Device, Driver information */
  42 #define DEVICE_NAME     "elants_i2c"
  43
  44 /* Convert from rows or columns into resolution */
  45 #define ELAN_TS_RESOLUTION(n, m)   (((n) - 1) * (m))
  46
  47 /* FW header data */
  48 #define HEADER_SIZE             4
  49 #define FW_HDR_TYPE             0
  50 #define FW_HDR_COUNT            1
  51 #define FW_HDR_LENGTH           2
  52
  53 /* Buffer mode Queue Header information */
  54 #define QUEUE_HEADER_SINGLE     0x62
  55 #define QUEUE_HEADER_NORMAL     0X63
  56 #define QUEUE_HEADER_WAIT       0x64
  57
  58 /* Command header definition */
  59 #define CMD_HEADER_WRITE        0x54
  60 #define CMD_HEADER_READ         0x53
  61 #define CMD_HEADER_6B_READ      0x5B
  62 #define CMD_HEADER_ROM_READ     0x96
  63 #define CMD_HEADER_RESP         0x52
  64 #define CMD_HEADER_6B_RESP      0x9B
  65 #define CMD_HEADER_ROM_RESP     0x95
  66 #define CMD_HEADER_HELLO        0x55
  67 #define CMD_HEADER_REK          0x66
  68
  69 /* FW position data */
  70 #define PACKET_SIZE             55
  71 #define MAX_CONTACT_NUM         10
  72 #define FW_POS_HEADER           0
  73 #define FW_POS_STATE            1
  74 #define FW_POS_TOTAL            2
  75 #define FW_POS_XY               3
  76 #define FW_POS_CHECKSUM         34
  77 #define FW_POS_WIDTH            35
  78 #define FW_POS_PRESSURE         45
  79
  80 #define HEADER_REPORT_10_FINGER 0x62
  81
  82 /* Header (4 bytes) plus 3 fill 10-finger packets */
  83 #define MAX_PACKET_SIZE         169
  84
  85 #define BOOT_TIME_DELAY_MS      50
  86
  87 /* FW read command, 0x53 0x?? 0x0, 0x01 */
  88 #define E_ELAN_INFO_FW_VER      0x00
  89 #define E_ELAN_INFO_BC_VER      0x10
  90 #define E_ELAN_INFO_TEST_VER    0xE0
  91 #define E_ELAN_INFO_FW_ID       0xF0
  92 #define E_INFO_OSR              0xD6
  93 #define E_INFO_PHY_SCAN         0xD7
  94 #define E_INFO_PHY_DRIVER       0xD8
  95
  96 #define MAX_RETRIES             3
  97 #define MAX_FW_UPDATE_RETRIES   30
  98
  99 #define ELAN_FW_PAGESIZE        132
 100
 101 /* calibration timeout definition */
 102 #define ELAN_CALI_TIMEOUT_MSEC  12000
 103
 104 #define ELAN_POWERON_DELAY_USEC 500
 105 #define ELAN_RESET_DELAY_MSEC   20
 106
 107 enum elants_state {
 108         ELAN_STATE_NORMAL,
 109         ELAN_WAIT_QUEUE_HEADER,
 110         ELAN_WAIT_RECALIBRATION,
 111 };
 112
 113 enum elants_iap_mode {
 114         ELAN_IAP_OPERATIONAL,
 115         ELAN_IAP_RECOVERY,
 116 };
 117
 118 /* struct elants_data - represents state of Elan touchscreen device */
 119 struct elants_data {
 120         struct i2c_client *client;
 121         struct input_dev *input;
 122
 123         struct regulator *vcc33;
 124         struct regulator *vccio;
 125         struct gpio_desc *reset_gpio;
 126
 127         u16 fw_version;
 128         u8 test_version;
 129         u8 solution_version;
 130         u8 bc_version;
 131         u8 iap_version;
 132         u16 hw_version;
 133         unsigned int x_res;     /* resolution in units/mm */
 134         unsigned int y_res;
 135         unsigned int x_max;
 136         unsigned int y_max;
 137
 138         enum elants_state state;
 139         enum elants_iap_mode iap_mode;
 140
 141         /* Guards against concurrent access to the device via sysfs */
 142         struct mutex sysfs_mutex;
 143
 144         u8 cmd_resp[HEADER_SIZE];
 145         struct completion cmd_done;
 146
 147         bool wake_irq_enabled;
 148         bool keep_power_in_suspend;
 149
 150         /* Must be last to be used for DMA operations */
 151         u8 buf[MAX_PACKET_SIZE] ____cacheline_aligned;
 152 };
 153
 154 static int elants_i2c_send(struct i2c_client *client,
 155                            const void *data, size_t size)
 156 {
 157         int ret;
 158
 159         ret = i2c_master_send(client, data, size);
 160         if (ret == size)
 161                 return 0;
 162
 163         if (ret >= 0)
 164                 ret = -EIO;
 165
 166         dev_err(&client->dev, "%s failed (%*ph): %d\n",
 167                 __func__, (int)size, data, ret);
 168
 169         return ret;
 170 }
 171
 172 static int elants_i2c_read(struct i2c_client *client, void *data, size_t size)
 173 {
 174         int ret;
 175
 176         ret = i2c_master_recv(client, data, size);
 177         if (ret == size)
 178                 return 0;
 179
 180         if (ret >= 0)
 181                 ret = -EIO;
 182
 183         dev_err(&client->dev, "%s failed: %d\n", __func__, ret);
 184
 185         return ret;
 186 }
 187
 188 static int elants_i2c_execute_command(struct i2c_client *client,
 189                                       const u8 *cmd, size_t cmd_size,
 190                                       u8 *resp, size_t resp_size)
 191 {
 192         struct i2c_msg msgs[2];
 193         int ret;
 194         u8 expected_response;
 195
 196         switch (cmd[0]) {
 197         case CMD_HEADER_READ:
 198                 expected_response = CMD_HEADER_RESP;
 199                 break;
 200
 201         case CMD_HEADER_6B_READ:
 202                 expected_response = CMD_HEADER_6B_RESP;
 203                 break;
 204
 205         case CMD_HEADER_ROM_READ:
 206                 expected_response = CMD_HEADER_ROM_RESP;
 207                 break;
 208
 209         default:
 210                 dev_err(&client->dev, "%s: invalid command %*ph\n",
 211                         __func__, (int)cmd_size, cmd);
 212                 return -EINVAL;
 213         }
 214
 215         msgs[0].addr = client->addr;
 216         msgs[0].flags = client->flags & I2C_M_TEN;
 217         msgs[0].len = cmd_size;
 218         msgs[0].buf = (u8 *)cmd;
 219
 220         msgs[1].addr = client->addr;
 221         msgs[1].flags = client->flags & I2C_M_TEN;
 222         msgs[1].flags |= I2C_M_RD;
 223         msgs[1].len = resp_size;
 224         msgs[1].buf = resp;
 225
 226         ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
 227         if (ret < 0)
 228                 return ret;
 229
 230         if (ret != ARRAY_SIZE(msgs) || resp[FW_HDR_TYPE] != expected_response)
 231                 return -EIO;
 232
 233         return 0;
 234 }
 235
 236 static int elants_i2c_calibrate(struct elants_data *ts)
 237 {
 238         struct i2c_client *client = ts->client;
 239         int ret, error;
 240         static const u8 w_flashkey[] = { 0x54, 0xC0, 0xE1, 0x5A };
 241         static const u8 rek[] = { 0x54, 0x29, 0x00, 0x01 };
 242         static const u8 rek_resp[] = { CMD_HEADER_REK, 0x66, 0x66, 0x66 };
 243
 244         disable_irq(client->irq);
 245
 246         ts->state = ELAN_WAIT_RECALIBRATION;
 247         reinit_completion(&ts->cmd_done);
 248
 249         elants_i2c_send(client, w_flashkey, sizeof(w_flashkey));
 250         elants_i2c_send(client, rek, sizeof(rek));
 251
 252         enable_irq(client->irq);
 253
 254         ret = wait_for_completion_interruptible_timeout(&ts->cmd_done,
 255                                 msecs_to_jiffies(ELAN_CALI_TIMEOUT_MSEC));
 256
 257         ts->state = ELAN_STATE_NORMAL;
 258
 259         if (ret <= 0) {
 260                 error = ret < 0 ? ret : -ETIMEDOUT;
 261                 dev_err(&client->dev,
 262                         "error while waiting for calibration to complete: %d\n",
 263                         error);
 264                 return error;
 265         }
 266
 267         if (memcmp(rek_resp, ts->cmd_resp, sizeof(rek_resp))) {
 268                 dev_err(&client->dev,
 269                         "unexpected calibration response: %*ph\n",
 270                         (int)sizeof(ts->cmd_resp), ts->cmd_resp);
 271                 return -EINVAL;
 272         }
 273
 274         return 0;
 275 }
 276
 277 static int elants_i2c_sw_reset(struct i2c_client *client)
 278 {
 279         const u8 soft_rst_cmd[] = { 0x77, 0x77, 0x77, 0x77 };
 280         int error;
 281
 282         error = elants_i2c_send(client, soft_rst_cmd,
 283                                 sizeof(soft_rst_cmd));
 284         if (error) {
 285                 dev_err(&client->dev, "software reset failed: %d\n", error);
 286                 return error;
 287         }
 288
 289         /*
 290          * We should wait at least 10 msec (but no more than 40) before
 291          * sending fastboot or IAP command to the device.
 292          */
 293         msleep(30);
 294
 295         return 0;
 296 }
 297
 298 static u16 elants_i2c_parse_version(u8 *buf)
 299 {
 300         return get_unaligned_be32(buf) >> 4;
 301 }
 302
 303 static int elants_i2c_query_hw_version(struct elants_data *ts)
 304 {
 305         struct i2c_client *client = ts->client;
 306         int error, retry_cnt;
 307         const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 };
 308         u8 resp[HEADER_SIZE];
 309
 310         for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
 311                 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
 312                                                    resp, sizeof(resp));
 313                 if (!error) {
 314                         ts->hw_version = elants_i2c_parse_version(resp);
 315                         if (ts->hw_version != 0xffff)
 316                                 return 0;
 317                 }
 318
 319                 dev_dbg(&client->dev, "read fw id error=%d, buf=%*phC\n",
 320                         error, (int)sizeof(resp), resp);
 321         }
 322
 323         if (error) {
 324                 dev_err(&client->dev,
 325                         "Failed to read fw id: %d\n", error);
 326                 return error;
 327         }
 328
 329         dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version);
 330
 331         return -EINVAL;
 332 }
 333
 334 static int elants_i2c_query_fw_version(struct elants_data *ts)
 335 {
 336         struct i2c_client *client = ts->client;
 337         int error, retry_cnt;
 338         const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 };
 339         u8 resp[HEADER_SIZE];
 340
 341         for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
 342                 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
 343                                                    resp, sizeof(resp));
 344                 if (!error) {
 345                         ts->fw_version = elants_i2c_parse_version(resp);
 346                         if (ts->fw_version != 0x0000 &&
 347                             ts->fw_version != 0xffff)
 348                                 return 0;
 349                 }
 350
 351                 dev_dbg(&client->dev, "read fw version error=%d, buf=%*phC\n",
 352                         error, (int)sizeof(resp), resp);
 353         }
 354
 355         dev_err(&client->dev,
 356                 "Failed to read fw version or fw version is invalid\n");
 357
 358         return -EINVAL;
 359 }
 360
 361 static int elants_i2c_query_test_version(struct elants_data *ts)
 362 {
 363         struct i2c_client *client = ts->client;
 364         int error, retry_cnt;
 365         u16 version;
 366         const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 };
 367         u8 resp[HEADER_SIZE];
 368
 369         for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
 370                 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
 371                                                    resp, sizeof(resp));
 372                 if (!error) {
 373                         version = elants_i2c_parse_version(resp);
 374                         ts->test_version = version >> 8;
 375                         ts->solution_version = version & 0xff;
 376
 377                         return 0;
 378                 }
 379
 380                 dev_dbg(&client->dev,
 381                         "read test version error rc=%d, buf=%*phC\n",
 382                         error, (int)sizeof(resp), resp);
 383         }
 384
 385         dev_err(&client->dev, "Failed to read test version\n");
 386
 387         return -EINVAL;
 388 }
 389
 390 static int elants_i2c_query_bc_version(struct elants_data *ts)
 391 {
 392         struct i2c_client *client = ts->client;
 393         const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_BC_VER, 0x00, 0x01 };
 394         u8 resp[HEADER_SIZE];
 395         u16 version;
 396         int error;
 397
 398         error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
 399                                            resp, sizeof(resp));
 400         if (error) {
 401                 dev_err(&client->dev,
 402                         "read BC version error=%d, buf=%*phC\n",
 403                         error, (int)sizeof(resp), resp);
 404                 return error;
 405         }
 406
 407         version = elants_i2c_parse_version(resp);
 408         ts->bc_version = version >> 8;
 409         ts->iap_version = version & 0xff;
 410
 411         return 0;
 412 }
 413
 414 static int elants_i2c_query_ts_info(struct elants_data *ts)
 415 {
 416         struct i2c_client *client = ts->client;
 417         int error;
 418         u8 resp[17];
 419         u16 phy_x, phy_y, rows, cols, osr;
 420         const u8 get_resolution_cmd[] = {
 421                 CMD_HEADER_6B_READ, 0x00, 0x00, 0x00, 0x00, 0x00
 422         };
 423         const u8 get_osr_cmd[] = {
 424                 CMD_HEADER_READ, E_INFO_OSR, 0x00, 0x01
 425         };
 426         const u8 get_physical_scan_cmd[] = {
 427                 CMD_HEADER_READ, E_INFO_PHY_SCAN, 0x00, 0x01
 428         };
 429         const u8 get_physical_drive_cmd[] = {
 430                 CMD_HEADER_READ, E_INFO_PHY_DRIVER, 0x00, 0x01
 431         };
 432
 433         /* Get trace number */
 434         error = elants_i2c_execute_command(client,
 435                                            get_resolution_cmd,
 436                                            sizeof(get_resolution_cmd),
 437                                            resp, sizeof(resp));
 438         if (error) {
 439                 dev_err(&client->dev, "get resolution command failed: %d\n",
 440                         error);
 441                 return error;
 442         }
 443
 444         rows = resp[2] + resp[6] + resp[10];
 445         cols = resp[3] + resp[7] + resp[11];
 446
 447         /* Process mm_to_pixel information */
 448         error = elants_i2c_execute_command(client,
 449                                            get_osr_cmd, sizeof(get_osr_cmd),
 450                                            resp, sizeof(resp));
 451         if (error) {
 452                 dev_err(&client->dev, "get osr command failed: %d\n",
 453                         error);
 454                 return error;
 455         }
 456
 457         osr = resp[3];
 458
 459         error = elants_i2c_execute_command(client,
 460                                            get_physical_scan_cmd,
 461                                            sizeof(get_physical_scan_cmd),
 462                                            resp, sizeof(resp));
 463         if (error) {
 464                 dev_err(&client->dev, "get physical scan command failed: %d\n",
 465                         error);
 466                 return error;
 467         }
 468
 469         phy_x = get_unaligned_be16(&resp[2]);
 470
 471         error = elants_i2c_execute_command(client,
 472                                            get_physical_drive_cmd,
 473                                            sizeof(get_physical_drive_cmd),
 474                                            resp, sizeof(resp));
 475         if (error) {
 476                 dev_err(&client->dev, "get physical drive command failed: %d\n",
 477                         error);
 478                 return error;
 479         }
 480
 481         phy_y = get_unaligned_be16(&resp[2]);
 482
 483         dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y);
 484
 485         if (rows == 0 || cols == 0 || osr == 0) {
 486                 dev_warn(&client->dev,
 487                          "invalid trace number data: %d, %d, %d\n",
 488                          rows, cols, osr);
 489         } else {
 490                 /* translate trace number to TS resolution */
 491                 ts->x_max = ELAN_TS_RESOLUTION(rows, osr);
 492                 ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x);
 493                 ts->y_max = ELAN_TS_RESOLUTION(cols, osr);
 494                 ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y);
 495         }
 496
 497         return 0;
 498 }
 499
 500 static int elants_i2c_fastboot(struct i2c_client *client)
 501 {
 502         const u8 boot_cmd[] = { 0x4D, 0x61, 0x69, 0x6E };
 503         int error;
 504
 505         error = elants_i2c_send(client, boot_cmd, sizeof(boot_cmd));
 506         if (error) {
 507                 dev_err(&client->dev, "boot failed: %d\n", error);
 508                 return error;
 509         }
 510
 511         dev_dbg(&client->dev, "boot success -- 0x%x\n", client->addr);
 512         return 0;
 513 }
 514
 515 static int elants_i2c_initialize(struct elants_data *ts)
 516 {
 517         struct i2c_client *client = ts->client;
 518         int error, error2, retry_cnt;
 519         const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 };
 520         const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 };
 521         u8 buf[HEADER_SIZE];
 522
 523         for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
 524                 error = elants_i2c_sw_reset(client);
 525                 if (error) {
 526                         /* Continue initializing if it's the last try */
 527                         if (retry_cnt < MAX_RETRIES - 1)
 528                                 continue;
 529                 }
 530
 531                 error = elants_i2c_fastboot(client);
 532                 if (error) {
 533                         /* Continue initializing if it's the last try */
 534                         if (retry_cnt < MAX_RETRIES - 1)
 535                                 continue;
 536                 }
 537
 538                 /* Wait for Hello packet */
 539                 msleep(BOOT_TIME_DELAY_MS);
 540
 541                 error = elants_i2c_read(client, buf, sizeof(buf));
 542                 if (error) {
 543                         dev_err(&client->dev,
 544                                 "failed to read 'hello' packet: %d\n", error);
 545                 } else if (!memcmp(buf, hello_packet, sizeof(hello_packet))) {
 546                         ts->iap_mode = ELAN_IAP_OPERATIONAL;
 547                         break;
 548                 } else if (!memcmp(buf, recov_packet, sizeof(recov_packet))) {
 549                         /*
 550                          * Setting error code will mark device
 551                          * in recovery mode below.
 552                          */
 553                         error = -EIO;
 554                         break;
 555                 } else {
 556                         error = -EINVAL;
 557                         dev_err(&client->dev,
 558                                 "invalid 'hello' packet: %*ph\n",
 559                                 (int)sizeof(buf), buf);
 560                 }
 561         }
 562
 563         /* hw version is available even if device in recovery state */
 564         error2 = elants_i2c_query_hw_version(ts);
 565         if (!error2)
 566                 error2 = elants_i2c_query_bc_version(ts);
 567         if (!error)
 568                 error = error2;
 569
 570         if (!error)
 571                 error = elants_i2c_query_fw_version(ts);
 572         if (!error)
 573                 error = elants_i2c_query_test_version(ts);
 574         if (!error)
 575                 error = elants_i2c_query_ts_info(ts);
 576
 577         if (error)
 578                 ts->iap_mode = ELAN_IAP_RECOVERY;
 579
 580         return 0;
 581 }
 582
 583 /*
 584  * Firmware update interface.
 585  */
 586
 587 static int elants_i2c_fw_write_page(struct i2c_client *client,
 588                                     const void *page)
 589 {
 590         const u8 ack_ok[] = { 0xaa, 0xaa };
 591         u8 buf[2];
 592         int retry;
 593         int error;
 594
 595         for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) {
 596                 error = elants_i2c_send(client, page, ELAN_FW_PAGESIZE);
 597                 if (error) {
 598                         dev_err(&client->dev,
 599                                 "IAP Write Page failed: %d\n", error);
 600                         continue;
 601                 }
 602
 603                 error = elants_i2c_read(client, buf, 2);
 604                 if (error) {
 605                         dev_err(&client->dev,
 606                                 "IAP Ack read failed: %d\n", error);
 607                         return error;
 608                 }
 609
 610                 if (!memcmp(buf, ack_ok, sizeof(ack_ok)))
 611                         return 0;
 612
 613                 error = -EIO;
 614                 dev_err(&client->dev,
 615                         "IAP Get Ack Error [%02x:%02x]\n",
 616                         buf[0], buf[1]);
 617         }
 618
 619         return error;
 620 }
 621
 622 static int elants_i2c_validate_remark_id(struct elants_data *ts,
 623                                          const struct firmware *fw)
 624 {
 625         struct i2c_client *client = ts->client;
 626         int error;
 627         const u8 cmd[] = { CMD_HEADER_ROM_READ, 0x80, 0x1F, 0x00, 0x00, 0x21 };
 628         u8 resp[6] = { 0 };
 629         u16 ts_remark_id = 0;
 630         u16 fw_remark_id = 0;
 631
 632         /* Compare TS Remark ID and FW Remark ID */
 633         error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
 634                                         resp, sizeof(resp));
 635         if (error) {
 636                 dev_err(&client->dev, "failed to query Remark ID: %d\n", error);
 637                 return error;
 638         }
 639
 640         ts_remark_id = get_unaligned_be16(&resp[3]);
 641
 642         fw_remark_id = get_unaligned_le16(&fw->data[fw->size - 4]);
 643
 644         if (fw_remark_id != ts_remark_id) {
 645                 dev_err(&client->dev,
 646                         "Remark ID Mismatched: ts_remark_id=0x%04x, fw_remark_id=0x%04x.\n",
 647                         ts_remark_id, fw_remark_id);
 648                 return -EINVAL;
 649         }
 650
 651         return 0;
 652 }
 653
 654 static int elants_i2c_do_update_firmware(struct i2c_client *client,
 655                                          const struct firmware *fw,
 656                                          bool force)
 657 {
 658         struct elants_data *ts = i2c_get_clientdata(client);
 659         const u8 enter_iap[] = { 0x45, 0x49, 0x41, 0x50 };
 660         const u8 enter_iap2[] = { 0x54, 0x00, 0x12, 0x34 };
 661         const u8 iap_ack[] = { 0x55, 0xaa, 0x33, 0xcc };
 662         const u8 close_idle[] = { 0x54, 0x2c, 0x01, 0x01 };
 663         u8 buf[HEADER_SIZE];
 664         u16 send_id;
 665         int page, n_fw_pages;
 666         int error;
 667         bool check_remark_id = ts->iap_version >= 0x60;
 668
 669         /* Recovery mode detection! */
 670         if (force) {
 671                 dev_dbg(&client->dev, "Recovery mode procedure\n");
 672
 673                 if (check_remark_id) {
 674                         error = elants_i2c_validate_remark_id(ts, fw);
 675                         if (error)
 676                                 return error;
 677                 }
 678
 679                 error = elants_i2c_send(client, enter_iap2, sizeof(enter_iap2));
 680                 if (error) {
 681                         dev_err(&client->dev, "failed to enter IAP mode: %d\n",
 682                                 error);
 683                         return error;
 684                 }
 685         } else {
 686                 /* Start IAP Procedure */
 687                 dev_dbg(&client->dev, "Normal IAP procedure\n");
 688
 689                 /* Close idle mode */
 690                 error = elants_i2c_send(client, close_idle, sizeof(close_idle));
 691                 if (error)
 692                         dev_err(&client->dev, "Failed close idle: %d\n", error);
 693                 msleep(60);
 694
 695                 elants_i2c_sw_reset(client);
 696                 msleep(20);
 697
 698                 if (check_remark_id) {
 699                         error = elants_i2c_validate_remark_id(ts, fw);
 700                         if (error)
 701                                 return error;
 702                 }
 703
 704                 error = elants_i2c_send(client, enter_iap, sizeof(enter_iap));
 705                 if (error) {
 706                         dev_err(&client->dev, "failed to enter IAP mode: %d\n",
 707                                 error);
 708                         return error;
 709                 }
 710         }
 711
 712         msleep(20);
 713
 714         /* check IAP state */
 715         error = elants_i2c_read(client, buf, 4);
 716         if (error) {
 717                 dev_err(&client->dev,
 718                         "failed to read IAP acknowledgement: %d\n",
 719                         error);
 720                 return error;
 721         }
 722
 723         if (memcmp(buf, iap_ack, sizeof(iap_ack))) {
 724                 dev_err(&client->dev,
 725                         "failed to enter IAP: %*ph (expected %*ph)\n",
 726                         (int)sizeof(buf), buf, (int)sizeof(iap_ack), iap_ack);
 727                 return -EIO;
 728         }
 729
 730         dev_info(&client->dev, "successfully entered IAP mode");
 731
 732         send_id = client->addr;
 733         error = elants_i2c_send(client, &send_id, 1);
 734         if (error) {
 735                 dev_err(&client->dev, "sending dummy byte failed: %d\n",
 736                         error);
 737                 return error;
 738         }
 739
 740         /* Clear the last page of Master */
 741         error = elants_i2c_send(client, fw->data, ELAN_FW_PAGESIZE);
 742         if (error) {
 743                 dev_err(&client->dev, "clearing of the last page failed: %d\n",
 744                         error);
 745                 return error;
 746         }
 747
 748         error = elants_i2c_read(client, buf, 2);
 749         if (error) {
 750                 dev_err(&client->dev,
 751                         "failed to read ACK for clearing the last page: %d\n",
 752                         error);
 753                 return error;
 754         }
 755
 756         n_fw_pages = fw->size / ELAN_FW_PAGESIZE;
 757         dev_dbg(&client->dev, "IAP Pages = %d\n", n_fw_pages);
 758
 759         for (page = 0; page < n_fw_pages; page++) {
 760                 error = elants_i2c_fw_write_page(client,
 761                                         fw->data + page * ELAN_FW_PAGESIZE);
 762                 if (error) {
 763                         dev_err(&client->dev,
 764                                 "failed to write FW page %d: %d\n",
 765                                 page, error);
 766                         return error;
 767                 }
 768         }
 769
 770         /* Old iap needs to wait 200ms for WDT and rest is for hello packets */
 771         msleep(300);
 772
 773         dev_info(&client->dev, "firmware update completed\n");
 774         return 0;
 775 }
 776
 777 static int elants_i2c_fw_update(struct elants_data *ts)
 778 {
 779         struct i2c_client *client = ts->client;
 780         const struct firmware *fw;
 781         char *fw_name;
 782         int error;
 783
 784         fw_name = kasprintf(GFP_KERNEL, "elants_i2c_%04x.bin", ts->hw_version);
 785         if (!fw_name)
 786                 return -ENOMEM;
 787
 788         dev_info(&client->dev, "requesting fw name = %s\n", fw_name);
 789         error = request_firmware(&fw, fw_name, &client->dev);
 790         kfree(fw_name);
 791         if (error) {
 792                 dev_err(&client->dev, "failed to request firmware: %d\n",
 793                         error);
 794                 return error;
 795         }
 796
 797         if (fw->size % ELAN_FW_PAGESIZE) {
 798                 dev_err(&client->dev, "invalid firmware length: %zu\n",
 799                         fw->size);
 800                 error = -EINVAL;
 801                 goto out;
 802         }
 803
 804         disable_irq(client->irq);
 805
 806         error = elants_i2c_do_update_firmware(client, fw,
 807                                         ts->iap_mode == ELAN_IAP_RECOVERY);
 808         if (error) {
 809                 dev_err(&client->dev, "firmware update failed: %d\n", error);
 810                 ts->iap_mode = ELAN_IAP_RECOVERY;
 811                 goto out_enable_irq;
 812         }
 813
 814         error = elants_i2c_initialize(ts);
 815         if (error) {
 816                 dev_err(&client->dev,
 817                         "failed to initialize device after firmware update: %d\n",
 818                         error);
 819                 ts->iap_mode = ELAN_IAP_RECOVERY;
 820                 goto out_enable_irq;
 821         }
 822
 823         ts->iap_mode = ELAN_IAP_OPERATIONAL;
 824
 825 out_enable_irq:
 826         ts->state = ELAN_STATE_NORMAL;
 827         enable_irq(client->irq);
 828         msleep(100);
 829
 830         if (!error)
 831                 elants_i2c_calibrate(ts);
 832 out:
 833         release_firmware(fw);
 834         return error;
 835 }
 836
 837 /*
 838  * Event reporting.
 839  */
 840
 841 static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf)
 842 {
 843         struct input_dev *input = ts->input;
 844         unsigned int n_fingers;
 845         u16 finger_state;
 846         int i;
 847
 848         n_fingers = buf[FW_POS_STATE + 1] & 0x0f;
 849         finger_state = ((buf[FW_POS_STATE + 1] & 0x30) << 4) |
 850                         buf[FW_POS_STATE];
 851
 852         dev_dbg(&ts->client->dev,
 853                 "n_fingers: %u, state: %04x\n",  n_fingers, finger_state);
 854
 855         for (i = 0; i < MAX_CONTACT_NUM && n_fingers; i++) {
 856                 if (finger_state & 1) {
 857                         unsigned int x, y, p, w;
 858                         u8 *pos;
 859
 860                         pos = &buf[FW_POS_XY + i * 3];
 861                         x = (((u16)pos[0] & 0xf0) << 4) | pos[1];
 862                         y = (((u16)pos[0] & 0x0f) << 8) | pos[2];
 863                         p = buf[FW_POS_PRESSURE + i];
 864                         w = buf[FW_POS_WIDTH + i];
 865
 866                         dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n",
 867                                 i, x, y, p, w);
 868
 869                         input_mt_slot(input, i);
 870                         input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
 871                         input_event(input, EV_ABS, ABS_MT_POSITION_X, x);
 872                         input_event(input, EV_ABS, ABS_MT_POSITION_Y, y);
 873                         input_event(input, EV_ABS, ABS_MT_PRESSURE, p);
 874                         input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w);
 875
 876                         n_fingers--;
 877                 }
 878
 879                 finger_state >>= 1;
 880         }
 881
 882         input_mt_sync_frame(input);
 883         input_sync(input);
 884 }
 885
 886 static u8 elants_i2c_calculate_checksum(u8 *buf)
 887 {
 888         u8 checksum = 0;
 889         u8 i;
 890
 891         for (i = 0; i < FW_POS_CHECKSUM; i++)
 892                 checksum += buf[i];
 893
 894         return checksum;
 895 }
 896
 897 static void elants_i2c_event(struct elants_data *ts, u8 *buf)
 898 {
 899         u8 checksum = elants_i2c_calculate_checksum(buf);
 900
 901         if (unlikely(buf[FW_POS_CHECKSUM] != checksum))
 902                 dev_warn(&ts->client->dev,
 903                          "%s: invalid checksum for packet %02x: %02x vs. %02x\n",
 904                          __func__, buf[FW_POS_HEADER],
 905                          checksum, buf[FW_POS_CHECKSUM]);
 906         else if (unlikely(buf[FW_POS_HEADER] != HEADER_REPORT_10_FINGER))
 907                 dev_warn(&ts->client->dev,
 908                          "%s: unknown packet type: %02x\n",
 909                          __func__, buf[FW_POS_HEADER]);
 910         else
 911                 elants_i2c_mt_event(ts, buf);
 912 }
 913
 914 static irqreturn_t elants_i2c_irq(int irq, void *_dev)
 915 {
 916         const u8 wait_packet[] = { 0x64, 0x64, 0x64, 0x64 };
 917         struct elants_data *ts = _dev;
 918         struct i2c_client *client = ts->client;
 919         int report_count, report_len;
 920         int i;
 921         int len;
 922
 923         len = i2c_master_recv_dmasafe(client, ts->buf, sizeof(ts->buf));
 924         if (len < 0) {
 925                 dev_err(&client->dev, "%s: failed to read data: %d\n",
 926                         __func__, len);
 927                 goto out;
 928         }
 929
 930         dev_dbg(&client->dev, "%s: packet %*ph\n",
 931                 __func__, HEADER_SIZE, ts->buf);
 932
 933         switch (ts->state) {
 934         case ELAN_WAIT_RECALIBRATION:
 935                 if (ts->buf[FW_HDR_TYPE] == CMD_HEADER_REK) {
 936                         memcpy(ts->cmd_resp, ts->buf, sizeof(ts->cmd_resp));
 937                         complete(&ts->cmd_done);
 938                         ts->state = ELAN_STATE_NORMAL;
 939                 }
 940                 break;
 941
 942         case ELAN_WAIT_QUEUE_HEADER:
 943                 if (ts->buf[FW_HDR_TYPE] != QUEUE_HEADER_NORMAL)
 944                         break;
 945
 946                 ts->state = ELAN_STATE_NORMAL;
 947                 /* fall through */
 948
 949         case ELAN_STATE_NORMAL:
 950
 951                 switch (ts->buf[FW_HDR_TYPE]) {
 952                 case CMD_HEADER_HELLO:
 953                 case CMD_HEADER_RESP:
 954                 case CMD_HEADER_REK:
 955                         break;
 956
 957                 case QUEUE_HEADER_WAIT:
 958                         if (memcmp(ts->buf, wait_packet, sizeof(wait_packet))) {
 959                                 dev_err(&client->dev,
 960                                         "invalid wait packet %*ph\n",
 961                                         HEADER_SIZE, ts->buf);
 962                         } else {
 963                                 ts->state = ELAN_WAIT_QUEUE_HEADER;
 964                                 udelay(30);
 965                         }
 966                         break;
 967
 968                 case QUEUE_HEADER_SINGLE:
 969                         elants_i2c_event(ts, &ts->buf[HEADER_SIZE]);
 970                         break;
 971
 972                 case QUEUE_HEADER_NORMAL:
 973                         report_count = ts->buf[FW_HDR_COUNT];
 974                         if (report_count == 0 || report_count > 3) {
 975                                 dev_err(&client->dev,
 976                                         "bad report count: %*ph\n",
 977                                         HEADER_SIZE, ts->buf);
 978                                 break;
 979                         }
 980
 981                         report_len = ts->buf[FW_HDR_LENGTH] / report_count;
 982                         if (report_len != PACKET_SIZE) {
 983                                 dev_err(&client->dev,
 984                                         "mismatching report length: %*ph\n",
 985                                         HEADER_SIZE, ts->buf);
 986                                 break;
 987                         }
 988
 989                         for (i = 0; i < report_count; i++) {
 990                                 u8 *buf = ts->buf + HEADER_SIZE +
 991                                                         i * PACKET_SIZE;
 992                                 elants_i2c_event(ts, buf);
 993                         }
 994                         break;
 995
 996                 default:
 997                         dev_err(&client->dev, "unknown packet %*ph\n",
 998                                 HEADER_SIZE, ts->buf);
 999                         break;
1000                 }
1001                 break;
1002         }
1003
1004 out:
1005         return IRQ_HANDLED;
1006 }
1007
1008 /*
1009  * sysfs interface
1010  */
1011 static ssize_t calibrate_store(struct device *dev,
1012                                struct device_attribute *attr,
1013                               const char *buf, size_t count)
1014 {
1015         struct i2c_client *client = to_i2c_client(dev);
1016         struct elants_data *ts = i2c_get_clientdata(client);
1017         int error;
1018
1019         error = mutex_lock_interruptible(&ts->sysfs_mutex);
1020         if (error)
1021                 return error;
1022
1023         error = elants_i2c_calibrate(ts);
1024
1025         mutex_unlock(&ts->sysfs_mutex);
1026         return error ?: count;
1027 }
1028
1029 static ssize_t write_update_fw(struct device *dev,
1030                                struct device_attribute *attr,
1031                                const char *buf, size_t count)
1032 {
1033         struct i2c_client *client = to_i2c_client(dev);
1034         struct elants_data *ts = i2c_get_clientdata(client);
1035         int error;
1036
1037         error = mutex_lock_interruptible(&ts->sysfs_mutex);
1038         if (error)
1039                 return error;
1040
1041         error = elants_i2c_fw_update(ts);
1042         dev_dbg(dev, "firmware update result: %d\n", error);
1043
1044         mutex_unlock(&ts->sysfs_mutex);
1045         return error ?: count;
1046 }
1047
1048 static ssize_t show_iap_mode(struct device *dev,
1049                              struct device_attribute *attr, char *buf)
1050 {
1051         struct i2c_client *client = to_i2c_client(dev);
1052         struct elants_data *ts = i2c_get_clientdata(client);
1053
1054         return sprintf(buf, "%s\n",
1055                        ts->iap_mode == ELAN_IAP_OPERATIONAL ?
1056                                 "Normal" : "Recovery");
1057 }
1058
1059 static DEVICE_ATTR_WO(calibrate);
1060 static DEVICE_ATTR(iap_mode, S_IRUGO, show_iap_mode, NULL);
1061 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw);
1062
1063 struct elants_version_attribute {
1064         struct device_attribute dattr;
1065         size_t field_offset;
1066         size_t field_size;
1067 };
1068
1069 #define __ELANTS_FIELD_SIZE(_field)                                     \
1070         sizeof(((struct elants_data *)NULL)->_field)
1071 #define __ELANTS_VERIFY_SIZE(_field)                                    \
1072         (BUILD_BUG_ON_ZERO(__ELANTS_FIELD_SIZE(_field) > 2) +           \
1073          __ELANTS_FIELD_SIZE(_field))
1074 #define ELANTS_VERSION_ATTR(_field)                                     \
1075         struct elants_version_attribute elants_ver_attr_##_field = {    \
1076                 .dattr = __ATTR(_field, S_IRUGO,                        \
1077                                 elants_version_attribute_show, NULL),   \
1078                 .field_offset = offsetof(struct elants_data, _field),   \
1079                 .field_size = __ELANTS_VERIFY_SIZE(_field),             \
1080         }
1081
1082 static ssize_t elants_version_attribute_show(struct device *dev,
1083                                              struct device_attribute *dattr,
1084                                              char *buf)
1085 {
1086         struct i2c_client *client = to_i2c_client(dev);
1087         struct elants_data *ts = i2c_get_clientdata(client);
1088         struct elants_version_attribute *attr =
1089                 container_of(dattr, struct elants_version_attribute, dattr);
1090         u8 *field = (u8 *)((char *)ts + attr->field_offset);
1091         unsigned int fmt_size;
1092         unsigned int val;
1093
1094         if (attr->field_size == 1) {
1095                 val = *field;
1096                 fmt_size = 2; /* 2 HEX digits */
1097         } else {
1098                 val = *(u16 *)field;
1099                 fmt_size = 4; /* 4 HEX digits */
1100         }
1101
1102         return sprintf(buf, "%0*x\n", fmt_size, val);
1103 }
1104
1105 static ELANTS_VERSION_ATTR(fw_version);
1106 static ELANTS_VERSION_ATTR(hw_version);
1107 static ELANTS_VERSION_ATTR(test_version);
1108 static ELANTS_VERSION_ATTR(solution_version);
1109 static ELANTS_VERSION_ATTR(bc_version);
1110 static ELANTS_VERSION_ATTR(iap_version);
1111
1112 static struct attribute *elants_attributes[] = {
1113         &dev_attr_calibrate.attr,
1114         &dev_attr_update_fw.attr,
1115         &dev_attr_iap_mode.attr,
1116
1117         &elants_ver_attr_fw_version.dattr.attr,
1118         &elants_ver_attr_hw_version.dattr.attr,
1119         &elants_ver_attr_test_version.dattr.attr,
1120         &elants_ver_attr_solution_version.dattr.attr,
1121         &elants_ver_attr_bc_version.dattr.attr,
1122         &elants_ver_attr_iap_version.dattr.attr,
1123         NULL
1124 };
1125
1126 static const struct attribute_group elants_attribute_group = {
1127         .attrs = elants_attributes,
1128 };
1129
1130 static int elants_i2c_power_on(struct elants_data *ts)
1131 {
1132         int error;
1133
1134         /*
1135          * If we do not have reset gpio assume platform firmware
1136          * controls regulators and does power them on for us.
1137          */
1138         if (IS_ERR_OR_NULL(ts->reset_gpio))
1139                 return 0;
1140
1141         gpiod_set_value_cansleep(ts->reset_gpio, 1);
1142
1143         error = regulator_enable(ts->vcc33);
1144         if (error) {
1145                 dev_err(&ts->client->dev,
1146                         "failed to enable vcc33 regulator: %d\n",
1147                         error);
1148                 goto release_reset_gpio;
1149         }
1150
1151         error = regulator_enable(ts->vccio);
1152         if (error) {
1153                 dev_err(&ts->client->dev,
1154                         "failed to enable vccio regulator: %d\n",
1155                         error);
1156                 regulator_disable(ts->vcc33);
1157                 goto release_reset_gpio;
1158         }
1159
1160         /*
1161          * We need to wait a bit after powering on controller before
1162          * we are allowed to release reset GPIO.
1163          */
1164         udelay(ELAN_POWERON_DELAY_USEC);
1165
1166 release_reset_gpio:
1167         gpiod_set_value_cansleep(ts->reset_gpio, 0);
1168         if (error)
1169                 return error;
1170
1171         msleep(ELAN_RESET_DELAY_MSEC);
1172
1173         return 0;
1174 }
1175
1176 static void elants_i2c_power_off(void *_data)
1177 {
1178         struct elants_data *ts = _data;
1179
1180         if (!IS_ERR_OR_NULL(ts->reset_gpio)) {
1181                 /*
1182                  * Activate reset gpio to prevent leakage through the
1183                  * pin once we shut off power to the controller.
1184                  */
1185                 gpiod_set_value_cansleep(ts->reset_gpio, 1);
1186                 regulator_disable(ts->vccio);
1187                 regulator_disable(ts->vcc33);
1188         }
1189 }
1190
1191 static int elants_i2c_probe(struct i2c_client *client,
1192                             const struct i2c_device_id *id)
1193 {
1194         union i2c_smbus_data dummy;
1195         struct elants_data *ts;
1196         unsigned long irqflags;
1197         int error;
1198
1199         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1200                 dev_err(&client->dev,
1201                         "%s: i2c check functionality error\n", DEVICE_NAME);
1202                 return -ENXIO;
1203         }
1204
1205         ts = devm_kzalloc(&client->dev, sizeof(struct elants_data), GFP_KERNEL);
1206         if (!ts)
1207                 return -ENOMEM;
1208
1209         mutex_init(&ts->sysfs_mutex);
1210         init_completion(&ts->cmd_done);
1211
1212         ts->client = client;
1213         i2c_set_clientdata(client, ts);
1214
1215         ts->vcc33 = devm_regulator_get(&client->dev, "vcc33");
1216         if (IS_ERR(ts->vcc33)) {
1217                 error = PTR_ERR(ts->vcc33);
1218                 if (error != -EPROBE_DEFER)
1219                         dev_err(&client->dev,
1220                                 "Failed to get 'vcc33' regulator: %d\n",
1221                                 error);
1222                 return error;
1223         }
1224
1225         ts->vccio = devm_regulator_get(&client->dev, "vccio");
1226         if (IS_ERR(ts->vccio)) {
1227                 error = PTR_ERR(ts->vccio);
1228                 if (error != -EPROBE_DEFER)
1229                         dev_err(&client->dev,
1230                                 "Failed to get 'vccio' regulator: %d\n",
1231                                 error);
1232                 return error;
1233         }
1234
1235         ts->reset_gpio = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW);
1236         if (IS_ERR(ts->reset_gpio)) {
1237                 error = PTR_ERR(ts->reset_gpio);
1238
1239                 if (error == -EPROBE_DEFER)
1240                         return error;
1241
1242                 if (error != -ENOENT && error != -ENOSYS) {
1243                         dev_err(&client->dev,
1244                                 "failed to get reset gpio: %d\n",
1245                                 error);
1246                         return error;
1247                 }
1248
1249                 ts->keep_power_in_suspend = true;
1250         }
1251
1252         error = elants_i2c_power_on(ts);
1253         if (error)
1254                 return error;
1255
1256         error = devm_add_action(&client->dev, elants_i2c_power_off, ts);
1257         if (error) {
1258                 dev_err(&client->dev,
1259                         "failed to install power off action: %d\n", error);
1260                 elants_i2c_power_off(ts);
1261                 return error;
1262         }
1263
1264         /* Make sure there is something at this address */
1265         if (i2c_smbus_xfer(client->adapter, client->addr, 0,
1266                            I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) {
1267                 dev_err(&client->dev, "nothing at this address\n");
1268                 return -ENXIO;
1269         }
1270
1271         error = elants_i2c_initialize(ts);
1272         if (error) {
1273                 dev_err(&client->dev, "failed to initialize: %d\n", error);
1274                 return error;
1275         }
1276
1277         ts->input = devm_input_allocate_device(&client->dev);
1278         if (!ts->input) {
1279                 dev_err(&client->dev, "Failed to allocate input device\n");
1280                 return -ENOMEM;
1281         }
1282
1283         ts->input->name = "Elan Touchscreen";
1284         ts->input->id.bustype = BUS_I2C;
1285
1286         __set_bit(BTN_TOUCH, ts->input->keybit);
1287         __set_bit(EV_ABS, ts->input->evbit);
1288         __set_bit(EV_KEY, ts->input->evbit);
1289
1290         /* Single touch input params setup */
1291         input_set_abs_params(ts->input, ABS_X, 0, ts->x_max, 0, 0);
1292         input_set_abs_params(ts->input, ABS_Y, 0, ts->y_max, 0, 0);
1293         input_set_abs_params(ts->input, ABS_PRESSURE, 0, 255, 0, 0);
1294         input_abs_set_res(ts->input, ABS_X, ts->x_res);
1295         input_abs_set_res(ts->input, ABS_Y, ts->y_res);
1296
1297         /* Multitouch input params setup */
1298         error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM,
1299                                     INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
1300         if (error) {
1301                 dev_err(&client->dev,
1302                         "failed to initialize MT slots: %d\n", error);
1303                 return error;
1304         }
1305
1306         input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0);
1307         input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0);
1308         input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
1309         input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
1310         input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res);
1311         input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res);
1312
1313         error = input_register_device(ts->input);
1314         if (error) {
1315                 dev_err(&client->dev,
1316                         "unable to register input device: %d\n", error);
1317                 return error;
1318         }
1319
1320         /*
1321          * Platform code (ACPI, DTS) should normally set up interrupt
1322          * for us, but in case it did not let's fall back to using falling
1323          * edge to be compatible with older Chromebooks.
1324          */
1325         irqflags = irq_get_trigger_type(client->irq);
1326         if (!irqflags)
1327                 irqflags = IRQF_TRIGGER_FALLING;
1328
1329         error = devm_request_threaded_irq(&client->dev, client->irq,
1330                                           NULL, elants_i2c_irq,
1331                                           irqflags | IRQF_ONESHOT,
1332                                           client->name, ts);
1333         if (error) {
1334                 dev_err(&client->dev, "Failed to register interrupt\n");
1335                 return error;
1336         }
1337
1338         /*
1339          * Systems using device tree should set up wakeup via DTS,
1340          * the rest will configure device as wakeup source by default.
1341          */
1342         if (!client->dev.of_node)
1343                 device_init_wakeup(&client->dev, true);
1344
1345         error = devm_device_add_group(&client->dev, &elants_attribute_group);
1346         if (error) {
1347                 dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
1348                         error);
1349                 return error;
1350         }
1351
1352         return 0;
1353 }
1354
1355 static int __maybe_unused elants_i2c_suspend(struct device *dev)
1356 {
1357         struct i2c_client *client = to_i2c_client(dev);
1358         struct elants_data *ts = i2c_get_clientdata(client);
1359         const u8 set_sleep_cmd[] = { 0x54, 0x50, 0x00, 0x01 };
1360         int retry_cnt;
1361         int error;
1362
1363         /* Command not support in IAP recovery mode */
1364         if (ts->iap_mode != ELAN_IAP_OPERATIONAL)
1365                 return -EBUSY;
1366
1367         disable_irq(client->irq);
1368
1369         if (device_may_wakeup(dev)) {
1370                 /*
1371                  * The device will automatically enter idle mode
1372                  * that has reduced power consumption.
1373                  */
1374                 ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0);
1375         } else if (ts->keep_power_in_suspend) {
1376                 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
1377                         error = elants_i2c_send(client, set_sleep_cmd,
1378                                                 sizeof(set_sleep_cmd));
1379                         if (!error)
1380                                 break;
1381
1382                         dev_err(&client->dev,
1383                                 "suspend command failed: %d\n", error);
1384                 }
1385         } else {
1386                 elants_i2c_power_off(ts);
1387         }
1388
1389         return 0;
1390 }
1391
1392 static int __maybe_unused elants_i2c_resume(struct device *dev)
1393 {
1394         struct i2c_client *client = to_i2c_client(dev);
1395         struct elants_data *ts = i2c_get_clientdata(client);
1396         const u8 set_active_cmd[] = { 0x54, 0x58, 0x00, 0x01 };
1397         int retry_cnt;
1398         int error;
1399
1400         if (device_may_wakeup(dev)) {
1401                 if (ts->wake_irq_enabled)
1402                         disable_irq_wake(client->irq);
1403                 elants_i2c_sw_reset(client);
1404         } else if (ts->keep_power_in_suspend) {
1405                 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
1406                         error = elants_i2c_send(client, set_active_cmd,
1407                                                 sizeof(set_active_cmd));
1408                         if (!error)
1409                                 break;
1410
1411                         dev_err(&client->dev,
1412                                 "resume command failed: %d\n", error);
1413                 }
1414         } else {
1415                 elants_i2c_power_on(ts);
1416                 elants_i2c_initialize(ts);
1417         }
1418
1419         ts->state = ELAN_STATE_NORMAL;
1420         enable_irq(client->irq);
1421
1422         return 0;
1423 }
1424
1425 static SIMPLE_DEV_PM_OPS(elants_i2c_pm_ops,
1426                          elants_i2c_suspend, elants_i2c_resume);
1427
1428 static const struct i2c_device_id elants_i2c_id[] = {
1429         { DEVICE_NAME, 0 },
1430         { }
1431 };
1432 MODULE_DEVICE_TABLE(i2c, elants_i2c_id);
1433
1434 #ifdef CONFIG_ACPI
1435 static const struct acpi_device_id elants_acpi_id[] = {
1436         { "ELAN0001", 0 },
1437         { }
1438 };
1439 MODULE_DEVICE_TABLE(acpi, elants_acpi_id);
1440 #endif
1441
1442 #ifdef CONFIG_OF
1443 static const struct of_device_id elants_of_match[] = {
1444         { .compatible = "elan,ekth3500" },
1445         { /* sentinel */ }
1446 };
1447 MODULE_DEVICE_TABLE(of, elants_of_match);
1448 #endif
1449
1450 static struct i2c_driver elants_i2c_driver = {
1451         .probe = elants_i2c_probe,
1452         .id_table = elants_i2c_id,
1453         .driver = {
1454                 .name = DEVICE_NAME,
1455                 .pm = &elants_i2c_pm_ops,
1456                 .acpi_match_table = ACPI_PTR(elants_acpi_id),
1457                 .of_match_table = of_match_ptr(elants_of_match),
1458                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1459         },
1460 };
1461 module_i2c_driver(elants_i2c_driver);
1462
1463 MODULE_AUTHOR("Scott Liu <scott.liu@emc.com.tw>");
1464 MODULE_DESCRIPTION("Elan I2c Touchscreen driver");
1465 MODULE_LICENSE("GPL");