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