1 /* 2 * Elan Microelectronics touch panels with I2C interface 3 * 4 * Copyright (C) 2014 Elan Microelectronics Corporation. 5 * Scott Liu <scott.liu@emc.com.tw> 6 * 7 * This code is partly based on hid-multitouch.c: 8 * 9 * Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr> 10 * Copyright (c) 2010-2012 Benjamin Tissoires <benjamin.tissoires@gmail.com> 11 * Copyright (c) 2010-2012 Ecole Nationale de l'Aviation Civile, France 12 * 13 * 14 * This code is partly based on i2c-hid.c: 15 * 16 * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com> 17 * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France 18 * Copyright (c) 2012 Red Hat, Inc 19 */ 20 21 /* 22 * This software is licensed under the terms of the GNU General Public 23 * License version 2, as published by the Free Software Foundation, and 24 * may be copied, distributed, and modified under those terms. 25 */ 26 27 #include <linux/module.h> 28 #include <linux/input.h> 29 #include <linux/interrupt.h> 30 #include <linux/platform_device.h> 31 #include <linux/async.h> 32 #include <linux/i2c.h> 33 #include <linux/delay.h> 34 #include <linux/uaccess.h> 35 #include <linux/buffer_head.h> 36 #include <linux/slab.h> 37 #include <linux/firmware.h> 38 #include <linux/input/mt.h> 39 #include <linux/acpi.h> 40 #include <linux/of.h> 41 #include <linux/gpio/consumer.h> 42 #include <linux/regulator/consumer.h> 43 #include <asm/unaligned.h> 44 45 /* Device, Driver information */ 46 #define DEVICE_NAME "elants_i2c" 47 #define DRV_VERSION "1.0.9" 48 49 /* Convert from rows or columns into resolution */ 50 #define ELAN_TS_RESOLUTION(n, m) (((n) - 1) * (m)) 51 52 /* FW header data */ 53 #define HEADER_SIZE 4 54 #define FW_HDR_TYPE 0 55 #define FW_HDR_COUNT 1 56 #define FW_HDR_LENGTH 2 57 58 /* Buffer mode Queue Header information */ 59 #define QUEUE_HEADER_SINGLE 0x62 60 #define QUEUE_HEADER_NORMAL 0X63 61 #define QUEUE_HEADER_WAIT 0x64 62 63 /* Command header definition */ 64 #define CMD_HEADER_WRITE 0x54 65 #define CMD_HEADER_READ 0x53 66 #define CMD_HEADER_6B_READ 0x5B 67 #define CMD_HEADER_RESP 0x52 68 #define CMD_HEADER_6B_RESP 0x9B 69 #define CMD_HEADER_HELLO 0x55 70 #define CMD_HEADER_REK 0x66 71 72 /* FW position data */ 73 #define PACKET_SIZE 55 74 #define MAX_CONTACT_NUM 10 75 #define FW_POS_HEADER 0 76 #define FW_POS_STATE 1 77 #define FW_POS_TOTAL 2 78 #define FW_POS_XY 3 79 #define FW_POS_CHECKSUM 34 80 #define FW_POS_WIDTH 35 81 #define FW_POS_PRESSURE 45 82 83 #define HEADER_REPORT_10_FINGER 0x62 84 85 /* Header (4 bytes) plus 3 fill 10-finger packets */ 86 #define MAX_PACKET_SIZE 169 87 88 #define BOOT_TIME_DELAY_MS 50 89 90 /* FW read command, 0x53 0x?? 0x0, 0x01 */ 91 #define E_ELAN_INFO_FW_VER 0x00 92 #define E_ELAN_INFO_BC_VER 0x10 93 #define E_ELAN_INFO_TEST_VER 0xE0 94 #define E_ELAN_INFO_FW_ID 0xF0 95 #define E_INFO_OSR 0xD6 96 #define E_INFO_PHY_SCAN 0xD7 97 #define E_INFO_PHY_DRIVER 0xD8 98 99 #define MAX_RETRIES 3 100 #define MAX_FW_UPDATE_RETRIES 30 101 102 #define ELAN_FW_PAGESIZE 132 103 104 /* calibration timeout definition */ 105 #define ELAN_CALI_TIMEOUT_MSEC 12000 106 107 #define ELAN_POWERON_DELAY_USEC 500 108 #define ELAN_RESET_DELAY_MSEC 20 109 110 enum elants_state { 111 ELAN_STATE_NORMAL, 112 ELAN_WAIT_QUEUE_HEADER, 113 ELAN_WAIT_RECALIBRATION, 114 }; 115 116 enum elants_iap_mode { 117 ELAN_IAP_OPERATIONAL, 118 ELAN_IAP_RECOVERY, 119 }; 120 121 /* struct elants_data - represents state of Elan touchscreen device */ 122 struct elants_data { 123 struct i2c_client *client; 124 struct input_dev *input; 125 126 struct regulator *vcc33; 127 struct regulator *vccio; 128 struct gpio_desc *reset_gpio; 129 130 u16 fw_version; 131 u8 test_version; 132 u8 solution_version; 133 u8 bc_version; 134 u8 iap_version; 135 u16 hw_version; 136 unsigned int x_res; /* resolution in units/mm */ 137 unsigned int y_res; 138 unsigned int x_max; 139 unsigned int y_max; 140 141 enum elants_state state; 142 enum elants_iap_mode iap_mode; 143 144 /* Guards against concurrent access to the device via sysfs */ 145 struct mutex sysfs_mutex; 146 147 u8 cmd_resp[HEADER_SIZE]; 148 struct completion cmd_done; 149 150 u8 buf[MAX_PACKET_SIZE]; 151 152 bool wake_irq_enabled; 153 bool keep_power_in_suspend; 154 }; 155 156 static int elants_i2c_send(struct i2c_client *client, 157 const void *data, size_t size) 158 { 159 int ret; 160 161 ret = i2c_master_send(client, data, size); 162 if (ret == size) 163 return 0; 164 165 if (ret >= 0) 166 ret = -EIO; 167 168 dev_err(&client->dev, "%s failed (%*ph): %d\n", 169 __func__, (int)size, data, ret); 170 171 return ret; 172 } 173 174 static int elants_i2c_read(struct i2c_client *client, void *data, size_t size) 175 { 176 int ret; 177 178 ret = i2c_master_recv(client, data, size); 179 if (ret == size) 180 return 0; 181 182 if (ret >= 0) 183 ret = -EIO; 184 185 dev_err(&client->dev, "%s failed: %d\n", __func__, ret); 186 187 return ret; 188 } 189 190 static int elants_i2c_execute_command(struct i2c_client *client, 191 const u8 *cmd, size_t cmd_size, 192 u8 *resp, size_t resp_size) 193 { 194 struct i2c_msg msgs[2]; 195 int ret; 196 u8 expected_response; 197 198 switch (cmd[0]) { 199 case CMD_HEADER_READ: 200 expected_response = CMD_HEADER_RESP; 201 break; 202 203 case CMD_HEADER_6B_READ: 204 expected_response = CMD_HEADER_6B_RESP; 205 break; 206 207 default: 208 dev_err(&client->dev, "%s: invalid command %*ph\n", 209 __func__, (int)cmd_size, cmd); 210 return -EINVAL; 211 } 212 213 msgs[0].addr = client->addr; 214 msgs[0].flags = client->flags & I2C_M_TEN; 215 msgs[0].len = cmd_size; 216 msgs[0].buf = (u8 *)cmd; 217 218 msgs[1].addr = client->addr; 219 msgs[1].flags = client->flags & I2C_M_TEN; 220 msgs[1].flags |= I2C_M_RD; 221 msgs[1].len = resp_size; 222 msgs[1].buf = resp; 223 224 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 225 if (ret < 0) 226 return ret; 227 228 if (ret != ARRAY_SIZE(msgs) || resp[FW_HDR_TYPE] != expected_response) 229 return -EIO; 230 231 return 0; 232 } 233 234 static int elants_i2c_calibrate(struct elants_data *ts) 235 { 236 struct i2c_client *client = ts->client; 237 int ret, error; 238 static const u8 w_flashkey[] = { 0x54, 0xC0, 0xE1, 0x5A }; 239 static const u8 rek[] = { 0x54, 0x29, 0x00, 0x01 }; 240 static const u8 rek_resp[] = { CMD_HEADER_REK, 0x66, 0x66, 0x66 }; 241 242 disable_irq(client->irq); 243 244 ts->state = ELAN_WAIT_RECALIBRATION; 245 reinit_completion(&ts->cmd_done); 246 247 elants_i2c_send(client, w_flashkey, sizeof(w_flashkey)); 248 elants_i2c_send(client, rek, sizeof(rek)); 249 250 enable_irq(client->irq); 251 252 ret = wait_for_completion_interruptible_timeout(&ts->cmd_done, 253 msecs_to_jiffies(ELAN_CALI_TIMEOUT_MSEC)); 254 255 ts->state = ELAN_STATE_NORMAL; 256 257 if (ret <= 0) { 258 error = ret < 0 ? ret : -ETIMEDOUT; 259 dev_err(&client->dev, 260 "error while waiting for calibration to complete: %d\n", 261 error); 262 return error; 263 } 264 265 if (memcmp(rek_resp, ts->cmd_resp, sizeof(rek_resp))) { 266 dev_err(&client->dev, 267 "unexpected calibration response: %*ph\n", 268 (int)sizeof(ts->cmd_resp), ts->cmd_resp); 269 return -EINVAL; 270 } 271 272 return 0; 273 } 274 275 static int elants_i2c_sw_reset(struct i2c_client *client) 276 { 277 const u8 soft_rst_cmd[] = { 0x77, 0x77, 0x77, 0x77 }; 278 int error; 279 280 error = elants_i2c_send(client, soft_rst_cmd, 281 sizeof(soft_rst_cmd)); 282 if (error) { 283 dev_err(&client->dev, "software reset failed: %d\n", error); 284 return error; 285 } 286 287 /* 288 * We should wait at least 10 msec (but no more than 40) before 289 * sending fastboot or IAP command to the device. 290 */ 291 msleep(30); 292 293 return 0; 294 } 295 296 static u16 elants_i2c_parse_version(u8 *buf) 297 { 298 return get_unaligned_be32(buf) >> 4; 299 } 300 301 static int elants_i2c_query_fw_id(struct elants_data *ts) 302 { 303 struct i2c_client *client = ts->client; 304 int error, retry_cnt; 305 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 }; 306 u8 resp[HEADER_SIZE]; 307 308 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 309 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 310 resp, sizeof(resp)); 311 if (!error) { 312 ts->hw_version = elants_i2c_parse_version(resp); 313 if (ts->hw_version != 0xffff) 314 return 0; 315 } 316 317 dev_dbg(&client->dev, "read fw id error=%d, buf=%*phC\n", 318 error, (int)sizeof(resp), resp); 319 } 320 321 dev_err(&client->dev, 322 "Failed to read fw id or fw id is invalid\n"); 323 324 return -EINVAL; 325 } 326 327 static int elants_i2c_query_fw_version(struct elants_data *ts) 328 { 329 struct i2c_client *client = ts->client; 330 int error, retry_cnt; 331 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 }; 332 u8 resp[HEADER_SIZE]; 333 334 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 335 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 336 resp, sizeof(resp)); 337 if (!error) { 338 ts->fw_version = elants_i2c_parse_version(resp); 339 if (ts->fw_version != 0x0000 && 340 ts->fw_version != 0xffff) 341 return 0; 342 } 343 344 dev_dbg(&client->dev, "read fw version error=%d, buf=%*phC\n", 345 error, (int)sizeof(resp), resp); 346 } 347 348 dev_err(&client->dev, 349 "Failed to read fw version or fw version is invalid\n"); 350 351 return -EINVAL; 352 } 353 354 static int elants_i2c_query_test_version(struct elants_data *ts) 355 { 356 struct i2c_client *client = ts->client; 357 int error, retry_cnt; 358 u16 version; 359 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 }; 360 u8 resp[HEADER_SIZE]; 361 362 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 363 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 364 resp, sizeof(resp)); 365 if (!error) { 366 version = elants_i2c_parse_version(resp); 367 ts->test_version = version >> 8; 368 ts->solution_version = version & 0xff; 369 370 return 0; 371 } 372 373 dev_dbg(&client->dev, 374 "read test version error rc=%d, buf=%*phC\n", 375 error, (int)sizeof(resp), resp); 376 } 377 378 dev_err(&client->dev, "Failed to read test version\n"); 379 380 return -EINVAL; 381 } 382 383 static int elants_i2c_query_bc_version(struct elants_data *ts) 384 { 385 struct i2c_client *client = ts->client; 386 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_BC_VER, 0x00, 0x01 }; 387 u8 resp[HEADER_SIZE]; 388 u16 version; 389 int error; 390 391 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 392 resp, sizeof(resp)); 393 if (error) { 394 dev_err(&client->dev, 395 "read BC version error=%d, buf=%*phC\n", 396 error, (int)sizeof(resp), resp); 397 return error; 398 } 399 400 version = elants_i2c_parse_version(resp); 401 ts->bc_version = version >> 8; 402 ts->iap_version = version & 0xff; 403 404 return 0; 405 } 406 407 static int elants_i2c_query_ts_info(struct elants_data *ts) 408 { 409 struct i2c_client *client = ts->client; 410 int error; 411 u8 resp[17]; 412 u16 phy_x, phy_y, rows, cols, osr; 413 const u8 get_resolution_cmd[] = { 414 CMD_HEADER_6B_READ, 0x00, 0x00, 0x00, 0x00, 0x00 415 }; 416 const u8 get_osr_cmd[] = { 417 CMD_HEADER_READ, E_INFO_OSR, 0x00, 0x01 418 }; 419 const u8 get_physical_scan_cmd[] = { 420 CMD_HEADER_READ, E_INFO_PHY_SCAN, 0x00, 0x01 421 }; 422 const u8 get_physical_drive_cmd[] = { 423 CMD_HEADER_READ, E_INFO_PHY_DRIVER, 0x00, 0x01 424 }; 425 426 /* Get trace number */ 427 error = elants_i2c_execute_command(client, 428 get_resolution_cmd, 429 sizeof(get_resolution_cmd), 430 resp, sizeof(resp)); 431 if (error) { 432 dev_err(&client->dev, "get resolution command failed: %d\n", 433 error); 434 return error; 435 } 436 437 rows = resp[2] + resp[6] + resp[10]; 438 cols = resp[3] + resp[7] + resp[11]; 439 440 /* Process mm_to_pixel information */ 441 error = elants_i2c_execute_command(client, 442 get_osr_cmd, sizeof(get_osr_cmd), 443 resp, sizeof(resp)); 444 if (error) { 445 dev_err(&client->dev, "get osr command failed: %d\n", 446 error); 447 return error; 448 } 449 450 osr = resp[3]; 451 452 error = elants_i2c_execute_command(client, 453 get_physical_scan_cmd, 454 sizeof(get_physical_scan_cmd), 455 resp, sizeof(resp)); 456 if (error) { 457 dev_err(&client->dev, "get physical scan command failed: %d\n", 458 error); 459 return error; 460 } 461 462 phy_x = get_unaligned_be16(&resp[2]); 463 464 error = elants_i2c_execute_command(client, 465 get_physical_drive_cmd, 466 sizeof(get_physical_drive_cmd), 467 resp, sizeof(resp)); 468 if (error) { 469 dev_err(&client->dev, "get physical drive command failed: %d\n", 470 error); 471 return error; 472 } 473 474 phy_y = get_unaligned_be16(&resp[2]); 475 476 dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y); 477 478 if (rows == 0 || cols == 0 || osr == 0) { 479 dev_warn(&client->dev, 480 "invalid trace number data: %d, %d, %d\n", 481 rows, cols, osr); 482 } else { 483 /* translate trace number to TS resolution */ 484 ts->x_max = ELAN_TS_RESOLUTION(rows, osr); 485 ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x); 486 ts->y_max = ELAN_TS_RESOLUTION(cols, osr); 487 ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y); 488 } 489 490 return 0; 491 } 492 493 static int elants_i2c_fastboot(struct i2c_client *client) 494 { 495 const u8 boot_cmd[] = { 0x4D, 0x61, 0x69, 0x6E }; 496 int error; 497 498 error = elants_i2c_send(client, boot_cmd, sizeof(boot_cmd)); 499 if (error) { 500 dev_err(&client->dev, "boot failed: %d\n", error); 501 return error; 502 } 503 504 dev_dbg(&client->dev, "boot success -- 0x%x\n", client->addr); 505 return 0; 506 } 507 508 static int elants_i2c_initialize(struct elants_data *ts) 509 { 510 struct i2c_client *client = ts->client; 511 int error, retry_cnt; 512 const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 }; 513 const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 }; 514 u8 buf[HEADER_SIZE]; 515 516 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 517 error = elants_i2c_sw_reset(client); 518 if (error) { 519 /* Continue initializing if it's the last try */ 520 if (retry_cnt < MAX_RETRIES - 1) 521 continue; 522 } 523 524 error = elants_i2c_fastboot(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 /* Wait for Hello packet */ 532 msleep(BOOT_TIME_DELAY_MS); 533 534 error = elants_i2c_read(client, buf, sizeof(buf)); 535 if (error) { 536 dev_err(&client->dev, 537 "failed to read 'hello' packet: %d\n", error); 538 } else if (!memcmp(buf, hello_packet, sizeof(hello_packet))) { 539 ts->iap_mode = ELAN_IAP_OPERATIONAL; 540 break; 541 } else if (!memcmp(buf, recov_packet, sizeof(recov_packet))) { 542 /* 543 * Setting error code will mark device 544 * in recovery mode below. 545 */ 546 error = -EIO; 547 break; 548 } else { 549 error = -EINVAL; 550 dev_err(&client->dev, 551 "invalid 'hello' packet: %*ph\n", 552 (int)sizeof(buf), buf); 553 } 554 } 555 556 if (!error) 557 error = elants_i2c_query_fw_id(ts); 558 if (!error) 559 error = elants_i2c_query_fw_version(ts); 560 561 if (error) { 562 ts->iap_mode = ELAN_IAP_RECOVERY; 563 } else { 564 elants_i2c_query_test_version(ts); 565 elants_i2c_query_bc_version(ts); 566 elants_i2c_query_ts_info(ts); 567 } 568 569 return 0; 570 } 571 572 /* 573 * Firmware update interface. 574 */ 575 576 static int elants_i2c_fw_write_page(struct i2c_client *client, 577 const void *page) 578 { 579 const u8 ack_ok[] = { 0xaa, 0xaa }; 580 u8 buf[2]; 581 int retry; 582 int error; 583 584 for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) { 585 error = elants_i2c_send(client, page, ELAN_FW_PAGESIZE); 586 if (error) { 587 dev_err(&client->dev, 588 "IAP Write Page failed: %d\n", error); 589 continue; 590 } 591 592 error = elants_i2c_read(client, buf, 2); 593 if (error) { 594 dev_err(&client->dev, 595 "IAP Ack read failed: %d\n", error); 596 return error; 597 } 598 599 if (!memcmp(buf, ack_ok, sizeof(ack_ok))) 600 return 0; 601 602 error = -EIO; 603 dev_err(&client->dev, 604 "IAP Get Ack Error [%02x:%02x]\n", 605 buf[0], buf[1]); 606 } 607 608 return error; 609 } 610 611 static int elants_i2c_do_update_firmware(struct i2c_client *client, 612 const struct firmware *fw, 613 bool force) 614 { 615 const u8 enter_iap[] = { 0x45, 0x49, 0x41, 0x50 }; 616 const u8 enter_iap2[] = { 0x54, 0x00, 0x12, 0x34 }; 617 const u8 iap_ack[] = { 0x55, 0xaa, 0x33, 0xcc }; 618 const u8 close_idle[] = {0x54, 0x2c, 0x01, 0x01}; 619 u8 buf[HEADER_SIZE]; 620 u16 send_id; 621 int page, n_fw_pages; 622 int error; 623 624 /* Recovery mode detection! */ 625 if (force) { 626 dev_dbg(&client->dev, "Recovery mode procedure\n"); 627 error = elants_i2c_send(client, enter_iap2, sizeof(enter_iap2)); 628 } else { 629 /* Start IAP Procedure */ 630 dev_dbg(&client->dev, "Normal IAP procedure\n"); 631 /* Close idle mode */ 632 error = elants_i2c_send(client, close_idle, sizeof(close_idle)); 633 if (error) 634 dev_err(&client->dev, "Failed close idle: %d\n", error); 635 msleep(60); 636 elants_i2c_sw_reset(client); 637 msleep(20); 638 error = elants_i2c_send(client, enter_iap, sizeof(enter_iap)); 639 } 640 641 if (error) { 642 dev_err(&client->dev, "failed to enter IAP mode: %d\n", error); 643 return error; 644 } 645 646 msleep(20); 647 648 /* check IAP state */ 649 error = elants_i2c_read(client, buf, 4); 650 if (error) { 651 dev_err(&client->dev, 652 "failed to read IAP acknowledgement: %d\n", 653 error); 654 return error; 655 } 656 657 if (memcmp(buf, iap_ack, sizeof(iap_ack))) { 658 dev_err(&client->dev, 659 "failed to enter IAP: %*ph (expected %*ph)\n", 660 (int)sizeof(buf), buf, (int)sizeof(iap_ack), iap_ack); 661 return -EIO; 662 } 663 664 dev_info(&client->dev, "successfully entered IAP mode"); 665 666 send_id = client->addr; 667 error = elants_i2c_send(client, &send_id, 1); 668 if (error) { 669 dev_err(&client->dev, "sending dummy byte failed: %d\n", 670 error); 671 return error; 672 } 673 674 /* Clear the last page of Master */ 675 error = elants_i2c_send(client, fw->data, ELAN_FW_PAGESIZE); 676 if (error) { 677 dev_err(&client->dev, "clearing of the last page failed: %d\n", 678 error); 679 return error; 680 } 681 682 error = elants_i2c_read(client, buf, 2); 683 if (error) { 684 dev_err(&client->dev, 685 "failed to read ACK for clearing the last page: %d\n", 686 error); 687 return error; 688 } 689 690 n_fw_pages = fw->size / ELAN_FW_PAGESIZE; 691 dev_dbg(&client->dev, "IAP Pages = %d\n", n_fw_pages); 692 693 for (page = 0; page < n_fw_pages; page++) { 694 error = elants_i2c_fw_write_page(client, 695 fw->data + page * ELAN_FW_PAGESIZE); 696 if (error) { 697 dev_err(&client->dev, 698 "failed to write FW page %d: %d\n", 699 page, error); 700 return error; 701 } 702 } 703 704 /* Old iap needs to wait 200ms for WDT and rest is for hello packets */ 705 msleep(300); 706 707 dev_info(&client->dev, "firmware update completed\n"); 708 return 0; 709 } 710 711 static int elants_i2c_fw_update(struct elants_data *ts) 712 { 713 struct i2c_client *client = ts->client; 714 const struct firmware *fw; 715 char *fw_name; 716 int error; 717 718 fw_name = kasprintf(GFP_KERNEL, "elants_i2c_%04x.bin", ts->hw_version); 719 if (!fw_name) 720 return -ENOMEM; 721 722 dev_info(&client->dev, "requesting fw name = %s\n", fw_name); 723 error = request_firmware(&fw, fw_name, &client->dev); 724 kfree(fw_name); 725 if (error) { 726 dev_err(&client->dev, "failed to request firmware: %d\n", 727 error); 728 return error; 729 } 730 731 if (fw->size % ELAN_FW_PAGESIZE) { 732 dev_err(&client->dev, "invalid firmware length: %zu\n", 733 fw->size); 734 error = -EINVAL; 735 goto out; 736 } 737 738 disable_irq(client->irq); 739 740 error = elants_i2c_do_update_firmware(client, fw, 741 ts->iap_mode == ELAN_IAP_RECOVERY); 742 if (error) { 743 dev_err(&client->dev, "firmware update failed: %d\n", error); 744 ts->iap_mode = ELAN_IAP_RECOVERY; 745 goto out_enable_irq; 746 } 747 748 error = elants_i2c_initialize(ts); 749 if (error) { 750 dev_err(&client->dev, 751 "failed to initialize device after firmware update: %d\n", 752 error); 753 ts->iap_mode = ELAN_IAP_RECOVERY; 754 goto out_enable_irq; 755 } 756 757 ts->iap_mode = ELAN_IAP_OPERATIONAL; 758 759 out_enable_irq: 760 ts->state = ELAN_STATE_NORMAL; 761 enable_irq(client->irq); 762 msleep(100); 763 764 if (!error) 765 elants_i2c_calibrate(ts); 766 out: 767 release_firmware(fw); 768 return error; 769 } 770 771 /* 772 * Event reporting. 773 */ 774 775 static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf) 776 { 777 struct input_dev *input = ts->input; 778 unsigned int n_fingers; 779 u16 finger_state; 780 int i; 781 782 n_fingers = buf[FW_POS_STATE + 1] & 0x0f; 783 finger_state = ((buf[FW_POS_STATE + 1] & 0x30) << 4) | 784 buf[FW_POS_STATE]; 785 786 dev_dbg(&ts->client->dev, 787 "n_fingers: %u, state: %04x\n", n_fingers, finger_state); 788 789 for (i = 0; i < MAX_CONTACT_NUM && n_fingers; i++) { 790 if (finger_state & 1) { 791 unsigned int x, y, p, w; 792 u8 *pos; 793 794 pos = &buf[FW_POS_XY + i * 3]; 795 x = (((u16)pos[0] & 0xf0) << 4) | pos[1]; 796 y = (((u16)pos[0] & 0x0f) << 8) | pos[2]; 797 p = buf[FW_POS_PRESSURE + i]; 798 w = buf[FW_POS_WIDTH + i]; 799 800 dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n", 801 i, x, y, p, w); 802 803 input_mt_slot(input, i); 804 input_mt_report_slot_state(input, MT_TOOL_FINGER, true); 805 input_event(input, EV_ABS, ABS_MT_POSITION_X, x); 806 input_event(input, EV_ABS, ABS_MT_POSITION_Y, y); 807 input_event(input, EV_ABS, ABS_MT_PRESSURE, p); 808 input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w); 809 810 n_fingers--; 811 } 812 813 finger_state >>= 1; 814 } 815 816 input_mt_sync_frame(input); 817 input_sync(input); 818 } 819 820 static u8 elants_i2c_calculate_checksum(u8 *buf) 821 { 822 u8 checksum = 0; 823 u8 i; 824 825 for (i = 0; i < FW_POS_CHECKSUM; i++) 826 checksum += buf[i]; 827 828 return checksum; 829 } 830 831 static void elants_i2c_event(struct elants_data *ts, u8 *buf) 832 { 833 u8 checksum = elants_i2c_calculate_checksum(buf); 834 835 if (unlikely(buf[FW_POS_CHECKSUM] != checksum)) 836 dev_warn(&ts->client->dev, 837 "%s: invalid checksum for packet %02x: %02x vs. %02x\n", 838 __func__, buf[FW_POS_HEADER], 839 checksum, buf[FW_POS_CHECKSUM]); 840 else if (unlikely(buf[FW_POS_HEADER] != HEADER_REPORT_10_FINGER)) 841 dev_warn(&ts->client->dev, 842 "%s: unknown packet type: %02x\n", 843 __func__, buf[FW_POS_HEADER]); 844 else 845 elants_i2c_mt_event(ts, buf); 846 } 847 848 static irqreturn_t elants_i2c_irq(int irq, void *_dev) 849 { 850 const u8 wait_packet[] = { 0x64, 0x64, 0x64, 0x64 }; 851 struct elants_data *ts = _dev; 852 struct i2c_client *client = ts->client; 853 int report_count, report_len; 854 int i; 855 int len; 856 857 len = i2c_master_recv(client, ts->buf, sizeof(ts->buf)); 858 if (len < 0) { 859 dev_err(&client->dev, "%s: failed to read data: %d\n", 860 __func__, len); 861 goto out; 862 } 863 864 dev_dbg(&client->dev, "%s: packet %*ph\n", 865 __func__, HEADER_SIZE, ts->buf); 866 867 switch (ts->state) { 868 case ELAN_WAIT_RECALIBRATION: 869 if (ts->buf[FW_HDR_TYPE] == CMD_HEADER_REK) { 870 memcpy(ts->cmd_resp, ts->buf, sizeof(ts->cmd_resp)); 871 complete(&ts->cmd_done); 872 ts->state = ELAN_STATE_NORMAL; 873 } 874 break; 875 876 case ELAN_WAIT_QUEUE_HEADER: 877 if (ts->buf[FW_HDR_TYPE] != QUEUE_HEADER_NORMAL) 878 break; 879 880 ts->state = ELAN_STATE_NORMAL; 881 /* fall through */ 882 883 case ELAN_STATE_NORMAL: 884 885 switch (ts->buf[FW_HDR_TYPE]) { 886 case CMD_HEADER_HELLO: 887 case CMD_HEADER_RESP: 888 case CMD_HEADER_REK: 889 break; 890 891 case QUEUE_HEADER_WAIT: 892 if (memcmp(ts->buf, wait_packet, sizeof(wait_packet))) { 893 dev_err(&client->dev, 894 "invalid wait packet %*ph\n", 895 HEADER_SIZE, ts->buf); 896 } else { 897 ts->state = ELAN_WAIT_QUEUE_HEADER; 898 udelay(30); 899 } 900 break; 901 902 case QUEUE_HEADER_SINGLE: 903 elants_i2c_event(ts, &ts->buf[HEADER_SIZE]); 904 break; 905 906 case QUEUE_HEADER_NORMAL: 907 report_count = ts->buf[FW_HDR_COUNT]; 908 if (report_count > 3) { 909 dev_err(&client->dev, 910 "too large report count: %*ph\n", 911 HEADER_SIZE, ts->buf); 912 break; 913 } 914 915 report_len = ts->buf[FW_HDR_LENGTH] / report_count; 916 if (report_len != PACKET_SIZE) { 917 dev_err(&client->dev, 918 "mismatching report length: %*ph\n", 919 HEADER_SIZE, ts->buf); 920 break; 921 } 922 923 for (i = 0; i < report_count; i++) { 924 u8 *buf = ts->buf + HEADER_SIZE + 925 i * PACKET_SIZE; 926 elants_i2c_event(ts, buf); 927 } 928 break; 929 930 default: 931 dev_err(&client->dev, "unknown packet %*ph\n", 932 HEADER_SIZE, ts->buf); 933 break; 934 } 935 break; 936 } 937 938 out: 939 return IRQ_HANDLED; 940 } 941 942 /* 943 * sysfs interface 944 */ 945 static ssize_t calibrate_store(struct device *dev, 946 struct device_attribute *attr, 947 const char *buf, size_t count) 948 { 949 struct i2c_client *client = to_i2c_client(dev); 950 struct elants_data *ts = i2c_get_clientdata(client); 951 int error; 952 953 error = mutex_lock_interruptible(&ts->sysfs_mutex); 954 if (error) 955 return error; 956 957 error = elants_i2c_calibrate(ts); 958 959 mutex_unlock(&ts->sysfs_mutex); 960 return error ?: count; 961 } 962 963 static ssize_t write_update_fw(struct device *dev, 964 struct device_attribute *attr, 965 const char *buf, size_t count) 966 { 967 struct i2c_client *client = to_i2c_client(dev); 968 struct elants_data *ts = i2c_get_clientdata(client); 969 int error; 970 971 error = mutex_lock_interruptible(&ts->sysfs_mutex); 972 if (error) 973 return error; 974 975 error = elants_i2c_fw_update(ts); 976 dev_dbg(dev, "firmware update result: %d\n", error); 977 978 mutex_unlock(&ts->sysfs_mutex); 979 return error ?: count; 980 } 981 982 static ssize_t show_iap_mode(struct device *dev, 983 struct device_attribute *attr, char *buf) 984 { 985 struct i2c_client *client = to_i2c_client(dev); 986 struct elants_data *ts = i2c_get_clientdata(client); 987 988 return sprintf(buf, "%s\n", 989 ts->iap_mode == ELAN_IAP_OPERATIONAL ? 990 "Normal" : "Recovery"); 991 } 992 993 static DEVICE_ATTR(calibrate, S_IWUSR, NULL, calibrate_store); 994 static DEVICE_ATTR(iap_mode, S_IRUGO, show_iap_mode, NULL); 995 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw); 996 997 struct elants_version_attribute { 998 struct device_attribute dattr; 999 size_t field_offset; 1000 size_t field_size; 1001 }; 1002 1003 #define __ELANTS_FIELD_SIZE(_field) \ 1004 sizeof(((struct elants_data *)NULL)->_field) 1005 #define __ELANTS_VERIFY_SIZE(_field) \ 1006 (BUILD_BUG_ON_ZERO(__ELANTS_FIELD_SIZE(_field) > 2) + \ 1007 __ELANTS_FIELD_SIZE(_field)) 1008 #define ELANTS_VERSION_ATTR(_field) \ 1009 struct elants_version_attribute elants_ver_attr_##_field = { \ 1010 .dattr = __ATTR(_field, S_IRUGO, \ 1011 elants_version_attribute_show, NULL), \ 1012 .field_offset = offsetof(struct elants_data, _field), \ 1013 .field_size = __ELANTS_VERIFY_SIZE(_field), \ 1014 } 1015 1016 static ssize_t elants_version_attribute_show(struct device *dev, 1017 struct device_attribute *dattr, 1018 char *buf) 1019 { 1020 struct i2c_client *client = to_i2c_client(dev); 1021 struct elants_data *ts = i2c_get_clientdata(client); 1022 struct elants_version_attribute *attr = 1023 container_of(dattr, struct elants_version_attribute, dattr); 1024 u8 *field = (u8 *)((char *)ts + attr->field_offset); 1025 unsigned int fmt_size; 1026 unsigned int val; 1027 1028 if (attr->field_size == 1) { 1029 val = *field; 1030 fmt_size = 2; /* 2 HEX digits */ 1031 } else { 1032 val = *(u16 *)field; 1033 fmt_size = 4; /* 4 HEX digits */ 1034 } 1035 1036 return sprintf(buf, "%0*x\n", fmt_size, val); 1037 } 1038 1039 static ELANTS_VERSION_ATTR(fw_version); 1040 static ELANTS_VERSION_ATTR(hw_version); 1041 static ELANTS_VERSION_ATTR(test_version); 1042 static ELANTS_VERSION_ATTR(solution_version); 1043 static ELANTS_VERSION_ATTR(bc_version); 1044 static ELANTS_VERSION_ATTR(iap_version); 1045 1046 static struct attribute *elants_attributes[] = { 1047 &dev_attr_calibrate.attr, 1048 &dev_attr_update_fw.attr, 1049 &dev_attr_iap_mode.attr, 1050 1051 &elants_ver_attr_fw_version.dattr.attr, 1052 &elants_ver_attr_hw_version.dattr.attr, 1053 &elants_ver_attr_test_version.dattr.attr, 1054 &elants_ver_attr_solution_version.dattr.attr, 1055 &elants_ver_attr_bc_version.dattr.attr, 1056 &elants_ver_attr_iap_version.dattr.attr, 1057 NULL 1058 }; 1059 1060 static struct attribute_group elants_attribute_group = { 1061 .attrs = elants_attributes, 1062 }; 1063 1064 static void elants_i2c_remove_sysfs_group(void *_data) 1065 { 1066 struct elants_data *ts = _data; 1067 1068 sysfs_remove_group(&ts->client->dev.kobj, &elants_attribute_group); 1069 } 1070 1071 static int elants_i2c_power_on(struct elants_data *ts) 1072 { 1073 int error; 1074 1075 /* 1076 * If we do not have reset gpio assume platform firmware 1077 * controls regulators and does power them on for us. 1078 */ 1079 if (IS_ERR_OR_NULL(ts->reset_gpio)) 1080 return 0; 1081 1082 gpiod_set_value_cansleep(ts->reset_gpio, 1); 1083 1084 error = regulator_enable(ts->vcc33); 1085 if (error) { 1086 dev_err(&ts->client->dev, 1087 "failed to enable vcc33 regulator: %d\n", 1088 error); 1089 goto release_reset_gpio; 1090 } 1091 1092 error = regulator_enable(ts->vccio); 1093 if (error) { 1094 dev_err(&ts->client->dev, 1095 "failed to enable vccio regulator: %d\n", 1096 error); 1097 regulator_disable(ts->vcc33); 1098 goto release_reset_gpio; 1099 } 1100 1101 /* 1102 * We need to wait a bit after powering on controller before 1103 * we are allowed to release reset GPIO. 1104 */ 1105 udelay(ELAN_POWERON_DELAY_USEC); 1106 1107 release_reset_gpio: 1108 gpiod_set_value_cansleep(ts->reset_gpio, 0); 1109 if (error) 1110 return error; 1111 1112 msleep(ELAN_RESET_DELAY_MSEC); 1113 1114 return 0; 1115 } 1116 1117 static void elants_i2c_power_off(void *_data) 1118 { 1119 struct elants_data *ts = _data; 1120 1121 if (!IS_ERR_OR_NULL(ts->reset_gpio)) { 1122 /* 1123 * Activate reset gpio to prevent leakage through the 1124 * pin once we shut off power to the controller. 1125 */ 1126 gpiod_set_value_cansleep(ts->reset_gpio, 1); 1127 regulator_disable(ts->vccio); 1128 regulator_disable(ts->vcc33); 1129 } 1130 } 1131 1132 static int elants_i2c_probe(struct i2c_client *client, 1133 const struct i2c_device_id *id) 1134 { 1135 union i2c_smbus_data dummy; 1136 struct elants_data *ts; 1137 unsigned long irqflags; 1138 int error; 1139 1140 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { 1141 dev_err(&client->dev, 1142 "%s: i2c check functionality error\n", DEVICE_NAME); 1143 return -ENXIO; 1144 } 1145 1146 ts = devm_kzalloc(&client->dev, sizeof(struct elants_data), GFP_KERNEL); 1147 if (!ts) 1148 return -ENOMEM; 1149 1150 mutex_init(&ts->sysfs_mutex); 1151 init_completion(&ts->cmd_done); 1152 1153 ts->client = client; 1154 i2c_set_clientdata(client, ts); 1155 1156 ts->vcc33 = devm_regulator_get(&client->dev, "vcc33"); 1157 if (IS_ERR(ts->vcc33)) { 1158 error = PTR_ERR(ts->vcc33); 1159 if (error != -EPROBE_DEFER) 1160 dev_err(&client->dev, 1161 "Failed to get 'vcc33' regulator: %d\n", 1162 error); 1163 return error; 1164 } 1165 1166 ts->vccio = devm_regulator_get(&client->dev, "vccio"); 1167 if (IS_ERR(ts->vccio)) { 1168 error = PTR_ERR(ts->vccio); 1169 if (error != -EPROBE_DEFER) 1170 dev_err(&client->dev, 1171 "Failed to get 'vccio' regulator: %d\n", 1172 error); 1173 return error; 1174 } 1175 1176 ts->reset_gpio = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW); 1177 if (IS_ERR(ts->reset_gpio)) { 1178 error = PTR_ERR(ts->reset_gpio); 1179 1180 if (error == -EPROBE_DEFER) 1181 return error; 1182 1183 if (error != -ENOENT && error != -ENOSYS) { 1184 dev_err(&client->dev, 1185 "failed to get reset gpio: %d\n", 1186 error); 1187 return error; 1188 } 1189 1190 ts->keep_power_in_suspend = true; 1191 } 1192 1193 error = elants_i2c_power_on(ts); 1194 if (error) 1195 return error; 1196 1197 error = devm_add_action(&client->dev, elants_i2c_power_off, ts); 1198 if (error) { 1199 dev_err(&client->dev, 1200 "failed to install power off action: %d\n", error); 1201 elants_i2c_power_off(ts); 1202 return error; 1203 } 1204 1205 /* Make sure there is something at this address */ 1206 if (i2c_smbus_xfer(client->adapter, client->addr, 0, 1207 I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) { 1208 dev_err(&client->dev, "nothing at this address\n"); 1209 return -ENXIO; 1210 } 1211 1212 error = elants_i2c_initialize(ts); 1213 if (error) { 1214 dev_err(&client->dev, "failed to initialize: %d\n", error); 1215 return error; 1216 } 1217 1218 ts->input = devm_input_allocate_device(&client->dev); 1219 if (!ts->input) { 1220 dev_err(&client->dev, "Failed to allocate input device\n"); 1221 return -ENOMEM; 1222 } 1223 1224 ts->input->name = "Elan Touchscreen"; 1225 ts->input->id.bustype = BUS_I2C; 1226 1227 __set_bit(BTN_TOUCH, ts->input->keybit); 1228 __set_bit(EV_ABS, ts->input->evbit); 1229 __set_bit(EV_KEY, ts->input->evbit); 1230 1231 /* Single touch input params setup */ 1232 input_set_abs_params(ts->input, ABS_X, 0, ts->x_max, 0, 0); 1233 input_set_abs_params(ts->input, ABS_Y, 0, ts->y_max, 0, 0); 1234 input_set_abs_params(ts->input, ABS_PRESSURE, 0, 255, 0, 0); 1235 input_abs_set_res(ts->input, ABS_X, ts->x_res); 1236 input_abs_set_res(ts->input, ABS_Y, ts->y_res); 1237 1238 /* Multitouch input params setup */ 1239 error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM, 1240 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); 1241 if (error) { 1242 dev_err(&client->dev, 1243 "failed to initialize MT slots: %d\n", error); 1244 return error; 1245 } 1246 1247 input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0); 1248 input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0); 1249 input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); 1250 input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0); 1251 input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res); 1252 input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res); 1253 1254 input_set_drvdata(ts->input, ts); 1255 1256 error = input_register_device(ts->input); 1257 if (error) { 1258 dev_err(&client->dev, 1259 "unable to register input device: %d\n", error); 1260 return error; 1261 } 1262 1263 /* 1264 * Systems using device tree should set up interrupt via DTS, 1265 * the rest will use the default falling edge interrupts. 1266 */ 1267 irqflags = client->dev.of_node ? 0 : IRQF_TRIGGER_FALLING; 1268 1269 error = devm_request_threaded_irq(&client->dev, client->irq, 1270 NULL, elants_i2c_irq, 1271 irqflags | IRQF_ONESHOT, 1272 client->name, ts); 1273 if (error) { 1274 dev_err(&client->dev, "Failed to register interrupt\n"); 1275 return error; 1276 } 1277 1278 /* 1279 * Systems using device tree should set up wakeup via DTS, 1280 * the rest will configure device as wakeup source by default. 1281 */ 1282 if (!client->dev.of_node) 1283 device_init_wakeup(&client->dev, true); 1284 1285 error = sysfs_create_group(&client->dev.kobj, &elants_attribute_group); 1286 if (error) { 1287 dev_err(&client->dev, "failed to create sysfs attributes: %d\n", 1288 error); 1289 return error; 1290 } 1291 1292 error = devm_add_action(&client->dev, 1293 elants_i2c_remove_sysfs_group, ts); 1294 if (error) { 1295 elants_i2c_remove_sysfs_group(ts); 1296 dev_err(&client->dev, 1297 "Failed to add sysfs cleanup action: %d\n", 1298 error); 1299 return error; 1300 } 1301 1302 return 0; 1303 } 1304 1305 static int __maybe_unused elants_i2c_suspend(struct device *dev) 1306 { 1307 struct i2c_client *client = to_i2c_client(dev); 1308 struct elants_data *ts = i2c_get_clientdata(client); 1309 const u8 set_sleep_cmd[] = { 0x54, 0x50, 0x00, 0x01 }; 1310 int retry_cnt; 1311 int error; 1312 1313 /* Command not support in IAP recovery mode */ 1314 if (ts->iap_mode != ELAN_IAP_OPERATIONAL) 1315 return -EBUSY; 1316 1317 disable_irq(client->irq); 1318 1319 if (device_may_wakeup(dev)) { 1320 /* 1321 * The device will automatically enter idle mode 1322 * that has reduced power consumption. 1323 */ 1324 ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0); 1325 } else if (ts->keep_power_in_suspend) { 1326 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 1327 error = elants_i2c_send(client, set_sleep_cmd, 1328 sizeof(set_sleep_cmd)); 1329 if (!error) 1330 break; 1331 1332 dev_err(&client->dev, 1333 "suspend command failed: %d\n", error); 1334 } 1335 } else { 1336 elants_i2c_power_off(ts); 1337 } 1338 1339 return 0; 1340 } 1341 1342 static int __maybe_unused elants_i2c_resume(struct device *dev) 1343 { 1344 struct i2c_client *client = to_i2c_client(dev); 1345 struct elants_data *ts = i2c_get_clientdata(client); 1346 const u8 set_active_cmd[] = { 0x54, 0x58, 0x00, 0x01 }; 1347 int retry_cnt; 1348 int error; 1349 1350 if (device_may_wakeup(dev)) { 1351 if (ts->wake_irq_enabled) 1352 disable_irq_wake(client->irq); 1353 elants_i2c_sw_reset(client); 1354 } else if (ts->keep_power_in_suspend) { 1355 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 1356 error = elants_i2c_send(client, set_active_cmd, 1357 sizeof(set_active_cmd)); 1358 if (!error) 1359 break; 1360 1361 dev_err(&client->dev, 1362 "resume command failed: %d\n", error); 1363 } 1364 } else { 1365 elants_i2c_power_on(ts); 1366 elants_i2c_initialize(ts); 1367 } 1368 1369 ts->state = ELAN_STATE_NORMAL; 1370 enable_irq(client->irq); 1371 1372 return 0; 1373 } 1374 1375 static SIMPLE_DEV_PM_OPS(elants_i2c_pm_ops, 1376 elants_i2c_suspend, elants_i2c_resume); 1377 1378 static const struct i2c_device_id elants_i2c_id[] = { 1379 { DEVICE_NAME, 0 }, 1380 { } 1381 }; 1382 MODULE_DEVICE_TABLE(i2c, elants_i2c_id); 1383 1384 #ifdef CONFIG_ACPI 1385 static const struct acpi_device_id elants_acpi_id[] = { 1386 { "ELAN0001", 0 }, 1387 { } 1388 }; 1389 MODULE_DEVICE_TABLE(acpi, elants_acpi_id); 1390 #endif 1391 1392 #ifdef CONFIG_OF 1393 static const struct of_device_id elants_of_match[] = { 1394 { .compatible = "elan,ekth3500" }, 1395 { /* sentinel */ } 1396 }; 1397 MODULE_DEVICE_TABLE(of, elants_of_match); 1398 #endif 1399 1400 static struct i2c_driver elants_i2c_driver = { 1401 .probe = elants_i2c_probe, 1402 .id_table = elants_i2c_id, 1403 .driver = { 1404 .name = DEVICE_NAME, 1405 .pm = &elants_i2c_pm_ops, 1406 .acpi_match_table = ACPI_PTR(elants_acpi_id), 1407 .of_match_table = of_match_ptr(elants_of_match), 1408 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1409 }, 1410 }; 1411 module_i2c_driver(elants_i2c_driver); 1412 1413 MODULE_AUTHOR("Scott Liu <scott.liu@emc.com.tw>"); 1414 MODULE_DESCRIPTION("Elan I2c Touchscreen driver"); 1415 MODULE_VERSION(DRV_VERSION); 1416 MODULE_LICENSE("GPL"); 1417