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