1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Elan Microelectronics touch panels with I2C interface 4 * 5 * Copyright (C) 2014 Elan Microelectronics Corporation. 6 * Scott Liu <scott.liu@emc.com.tw> 7 * 8 * This code is partly based on hid-multitouch.c: 9 * 10 * Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr> 11 * Copyright (c) 2010-2012 Benjamin Tissoires <benjamin.tissoires@gmail.com> 12 * Copyright (c) 2010-2012 Ecole Nationale de l'Aviation Civile, France 13 * 14 * This code is partly based on i2c-hid.c: 15 * 16 * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com> 17 * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France 18 * Copyright (c) 2012 Red Hat, Inc 19 */ 20 21 22 #include <linux/module.h> 23 #include <linux/input.h> 24 #include <linux/interrupt.h> 25 #include <linux/irq.h> 26 #include <linux/platform_device.h> 27 #include <linux/async.h> 28 #include <linux/i2c.h> 29 #include <linux/delay.h> 30 #include <linux/uaccess.h> 31 #include <linux/buffer_head.h> 32 #include <linux/slab.h> 33 #include <linux/firmware.h> 34 #include <linux/input/mt.h> 35 #include <linux/acpi.h> 36 #include <linux/of.h> 37 #include <linux/gpio/consumer.h> 38 #include <linux/regulator/consumer.h> 39 #include <asm/unaligned.h> 40 41 /* Device, Driver information */ 42 #define DEVICE_NAME "elants_i2c" 43 44 /* Convert from rows or columns into resolution */ 45 #define ELAN_TS_RESOLUTION(n, m) (((n) - 1) * (m)) 46 47 /* FW header data */ 48 #define HEADER_SIZE 4 49 #define FW_HDR_TYPE 0 50 #define FW_HDR_COUNT 1 51 #define FW_HDR_LENGTH 2 52 53 /* Buffer mode Queue Header information */ 54 #define QUEUE_HEADER_SINGLE 0x62 55 #define QUEUE_HEADER_NORMAL 0X63 56 #define QUEUE_HEADER_WAIT 0x64 57 58 /* Command header definition */ 59 #define CMD_HEADER_WRITE 0x54 60 #define CMD_HEADER_READ 0x53 61 #define CMD_HEADER_6B_READ 0x5B 62 #define CMD_HEADER_ROM_READ 0x96 63 #define CMD_HEADER_RESP 0x52 64 #define CMD_HEADER_6B_RESP 0x9B 65 #define CMD_HEADER_ROM_RESP 0x95 66 #define CMD_HEADER_HELLO 0x55 67 #define CMD_HEADER_REK 0x66 68 69 /* FW position data */ 70 #define PACKET_SIZE 55 71 #define MAX_CONTACT_NUM 10 72 #define FW_POS_HEADER 0 73 #define FW_POS_STATE 1 74 #define FW_POS_TOTAL 2 75 #define FW_POS_XY 3 76 #define FW_POS_CHECKSUM 34 77 #define FW_POS_WIDTH 35 78 #define FW_POS_PRESSURE 45 79 80 #define HEADER_REPORT_10_FINGER 0x62 81 82 /* Header (4 bytes) plus 3 fill 10-finger packets */ 83 #define MAX_PACKET_SIZE 169 84 85 #define BOOT_TIME_DELAY_MS 50 86 87 /* FW read command, 0x53 0x?? 0x0, 0x01 */ 88 #define E_ELAN_INFO_FW_VER 0x00 89 #define E_ELAN_INFO_BC_VER 0x10 90 #define E_ELAN_INFO_TEST_VER 0xE0 91 #define E_ELAN_INFO_FW_ID 0xF0 92 #define E_INFO_OSR 0xD6 93 #define E_INFO_PHY_SCAN 0xD7 94 #define E_INFO_PHY_DRIVER 0xD8 95 96 #define MAX_RETRIES 3 97 #define MAX_FW_UPDATE_RETRIES 30 98 99 #define ELAN_FW_PAGESIZE 132 100 101 /* calibration timeout definition */ 102 #define ELAN_CALI_TIMEOUT_MSEC 12000 103 104 #define ELAN_POWERON_DELAY_USEC 500 105 #define ELAN_RESET_DELAY_MSEC 20 106 107 enum elants_state { 108 ELAN_STATE_NORMAL, 109 ELAN_WAIT_QUEUE_HEADER, 110 ELAN_WAIT_RECALIBRATION, 111 }; 112 113 enum elants_iap_mode { 114 ELAN_IAP_OPERATIONAL, 115 ELAN_IAP_RECOVERY, 116 }; 117 118 /* struct elants_data - represents state of Elan touchscreen device */ 119 struct elants_data { 120 struct i2c_client *client; 121 struct input_dev *input; 122 123 struct regulator *vcc33; 124 struct regulator *vccio; 125 struct gpio_desc *reset_gpio; 126 127 u16 fw_version; 128 u8 test_version; 129 u8 solution_version; 130 u8 bc_version; 131 u8 iap_version; 132 u16 hw_version; 133 unsigned int x_res; /* resolution in units/mm */ 134 unsigned int y_res; 135 unsigned int x_max; 136 unsigned int y_max; 137 138 enum elants_state state; 139 enum elants_iap_mode iap_mode; 140 141 /* Guards against concurrent access to the device via sysfs */ 142 struct mutex sysfs_mutex; 143 144 u8 cmd_resp[HEADER_SIZE]; 145 struct completion cmd_done; 146 147 bool wake_irq_enabled; 148 bool keep_power_in_suspend; 149 150 /* Must be last to be used for DMA operations */ 151 u8 buf[MAX_PACKET_SIZE] ____cacheline_aligned; 152 }; 153 154 static int elants_i2c_send(struct i2c_client *client, 155 const void *data, size_t size) 156 { 157 int ret; 158 159 ret = i2c_master_send(client, data, size); 160 if (ret == size) 161 return 0; 162 163 if (ret >= 0) 164 ret = -EIO; 165 166 dev_err(&client->dev, "%s failed (%*ph): %d\n", 167 __func__, (int)size, data, ret); 168 169 return ret; 170 } 171 172 static int elants_i2c_read(struct i2c_client *client, void *data, size_t size) 173 { 174 int ret; 175 176 ret = i2c_master_recv(client, data, size); 177 if (ret == size) 178 return 0; 179 180 if (ret >= 0) 181 ret = -EIO; 182 183 dev_err(&client->dev, "%s failed: %d\n", __func__, ret); 184 185 return ret; 186 } 187 188 static int elants_i2c_execute_command(struct i2c_client *client, 189 const u8 *cmd, size_t cmd_size, 190 u8 *resp, size_t resp_size) 191 { 192 struct i2c_msg msgs[2]; 193 int ret; 194 u8 expected_response; 195 196 switch (cmd[0]) { 197 case CMD_HEADER_READ: 198 expected_response = CMD_HEADER_RESP; 199 break; 200 201 case CMD_HEADER_6B_READ: 202 expected_response = CMD_HEADER_6B_RESP; 203 break; 204 205 case CMD_HEADER_ROM_READ: 206 expected_response = CMD_HEADER_ROM_RESP; 207 break; 208 209 default: 210 dev_err(&client->dev, "%s: invalid command %*ph\n", 211 __func__, (int)cmd_size, cmd); 212 return -EINVAL; 213 } 214 215 msgs[0].addr = client->addr; 216 msgs[0].flags = client->flags & I2C_M_TEN; 217 msgs[0].len = cmd_size; 218 msgs[0].buf = (u8 *)cmd; 219 220 msgs[1].addr = client->addr; 221 msgs[1].flags = client->flags & I2C_M_TEN; 222 msgs[1].flags |= I2C_M_RD; 223 msgs[1].len = resp_size; 224 msgs[1].buf = resp; 225 226 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 227 if (ret < 0) 228 return ret; 229 230 if (ret != ARRAY_SIZE(msgs) || resp[FW_HDR_TYPE] != expected_response) 231 return -EIO; 232 233 return 0; 234 } 235 236 static int elants_i2c_calibrate(struct elants_data *ts) 237 { 238 struct i2c_client *client = ts->client; 239 int ret, error; 240 static const u8 w_flashkey[] = { 0x54, 0xC0, 0xE1, 0x5A }; 241 static const u8 rek[] = { 0x54, 0x29, 0x00, 0x01 }; 242 static const u8 rek_resp[] = { CMD_HEADER_REK, 0x66, 0x66, 0x66 }; 243 244 disable_irq(client->irq); 245 246 ts->state = ELAN_WAIT_RECALIBRATION; 247 reinit_completion(&ts->cmd_done); 248 249 elants_i2c_send(client, w_flashkey, sizeof(w_flashkey)); 250 elants_i2c_send(client, rek, sizeof(rek)); 251 252 enable_irq(client->irq); 253 254 ret = wait_for_completion_interruptible_timeout(&ts->cmd_done, 255 msecs_to_jiffies(ELAN_CALI_TIMEOUT_MSEC)); 256 257 ts->state = ELAN_STATE_NORMAL; 258 259 if (ret <= 0) { 260 error = ret < 0 ? ret : -ETIMEDOUT; 261 dev_err(&client->dev, 262 "error while waiting for calibration to complete: %d\n", 263 error); 264 return error; 265 } 266 267 if (memcmp(rek_resp, ts->cmd_resp, sizeof(rek_resp))) { 268 dev_err(&client->dev, 269 "unexpected calibration response: %*ph\n", 270 (int)sizeof(ts->cmd_resp), ts->cmd_resp); 271 return -EINVAL; 272 } 273 274 return 0; 275 } 276 277 static int elants_i2c_sw_reset(struct i2c_client *client) 278 { 279 const u8 soft_rst_cmd[] = { 0x77, 0x77, 0x77, 0x77 }; 280 int error; 281 282 error = elants_i2c_send(client, soft_rst_cmd, 283 sizeof(soft_rst_cmd)); 284 if (error) { 285 dev_err(&client->dev, "software reset failed: %d\n", error); 286 return error; 287 } 288 289 /* 290 * We should wait at least 10 msec (but no more than 40) before 291 * sending fastboot or IAP command to the device. 292 */ 293 msleep(30); 294 295 return 0; 296 } 297 298 static u16 elants_i2c_parse_version(u8 *buf) 299 { 300 return get_unaligned_be32(buf) >> 4; 301 } 302 303 static int elants_i2c_query_hw_version(struct elants_data *ts) 304 { 305 struct i2c_client *client = ts->client; 306 int error, retry_cnt; 307 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 }; 308 u8 resp[HEADER_SIZE]; 309 310 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 311 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 312 resp, sizeof(resp)); 313 if (!error) { 314 ts->hw_version = elants_i2c_parse_version(resp); 315 if (ts->hw_version != 0xffff) 316 return 0; 317 } 318 319 dev_dbg(&client->dev, "read fw id error=%d, buf=%*phC\n", 320 error, (int)sizeof(resp), resp); 321 } 322 323 if (error) { 324 dev_err(&client->dev, 325 "Failed to read fw id: %d\n", error); 326 return error; 327 } 328 329 dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version); 330 331 return -EINVAL; 332 } 333 334 static int elants_i2c_query_fw_version(struct elants_data *ts) 335 { 336 struct i2c_client *client = ts->client; 337 int error, retry_cnt; 338 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 }; 339 u8 resp[HEADER_SIZE]; 340 341 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 342 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 343 resp, sizeof(resp)); 344 if (!error) { 345 ts->fw_version = elants_i2c_parse_version(resp); 346 if (ts->fw_version != 0x0000 && 347 ts->fw_version != 0xffff) 348 return 0; 349 } 350 351 dev_dbg(&client->dev, "read fw version error=%d, buf=%*phC\n", 352 error, (int)sizeof(resp), resp); 353 } 354 355 dev_err(&client->dev, 356 "Failed to read fw version or fw version is invalid\n"); 357 358 return -EINVAL; 359 } 360 361 static int elants_i2c_query_test_version(struct elants_data *ts) 362 { 363 struct i2c_client *client = ts->client; 364 int error, retry_cnt; 365 u16 version; 366 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 }; 367 u8 resp[HEADER_SIZE]; 368 369 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 370 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 371 resp, sizeof(resp)); 372 if (!error) { 373 version = elants_i2c_parse_version(resp); 374 ts->test_version = version >> 8; 375 ts->solution_version = version & 0xff; 376 377 return 0; 378 } 379 380 dev_dbg(&client->dev, 381 "read test version error rc=%d, buf=%*phC\n", 382 error, (int)sizeof(resp), resp); 383 } 384 385 dev_err(&client->dev, "Failed to read test version\n"); 386 387 return -EINVAL; 388 } 389 390 static int elants_i2c_query_bc_version(struct elants_data *ts) 391 { 392 struct i2c_client *client = ts->client; 393 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_BC_VER, 0x00, 0x01 }; 394 u8 resp[HEADER_SIZE]; 395 u16 version; 396 int error; 397 398 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 399 resp, sizeof(resp)); 400 if (error) { 401 dev_err(&client->dev, 402 "read BC version error=%d, buf=%*phC\n", 403 error, (int)sizeof(resp), resp); 404 return error; 405 } 406 407 version = elants_i2c_parse_version(resp); 408 ts->bc_version = version >> 8; 409 ts->iap_version = version & 0xff; 410 411 return 0; 412 } 413 414 static int elants_i2c_query_ts_info(struct elants_data *ts) 415 { 416 struct i2c_client *client = ts->client; 417 int error; 418 u8 resp[17]; 419 u16 phy_x, phy_y, rows, cols, osr; 420 const u8 get_resolution_cmd[] = { 421 CMD_HEADER_6B_READ, 0x00, 0x00, 0x00, 0x00, 0x00 422 }; 423 const u8 get_osr_cmd[] = { 424 CMD_HEADER_READ, E_INFO_OSR, 0x00, 0x01 425 }; 426 const u8 get_physical_scan_cmd[] = { 427 CMD_HEADER_READ, E_INFO_PHY_SCAN, 0x00, 0x01 428 }; 429 const u8 get_physical_drive_cmd[] = { 430 CMD_HEADER_READ, E_INFO_PHY_DRIVER, 0x00, 0x01 431 }; 432 433 /* Get trace number */ 434 error = elants_i2c_execute_command(client, 435 get_resolution_cmd, 436 sizeof(get_resolution_cmd), 437 resp, sizeof(resp)); 438 if (error) { 439 dev_err(&client->dev, "get resolution command failed: %d\n", 440 error); 441 return error; 442 } 443 444 rows = resp[2] + resp[6] + resp[10]; 445 cols = resp[3] + resp[7] + resp[11]; 446 447 /* Process mm_to_pixel information */ 448 error = elants_i2c_execute_command(client, 449 get_osr_cmd, sizeof(get_osr_cmd), 450 resp, sizeof(resp)); 451 if (error) { 452 dev_err(&client->dev, "get osr command failed: %d\n", 453 error); 454 return error; 455 } 456 457 osr = resp[3]; 458 459 error = elants_i2c_execute_command(client, 460 get_physical_scan_cmd, 461 sizeof(get_physical_scan_cmd), 462 resp, sizeof(resp)); 463 if (error) { 464 dev_err(&client->dev, "get physical scan command failed: %d\n", 465 error); 466 return error; 467 } 468 469 phy_x = get_unaligned_be16(&resp[2]); 470 471 error = elants_i2c_execute_command(client, 472 get_physical_drive_cmd, 473 sizeof(get_physical_drive_cmd), 474 resp, sizeof(resp)); 475 if (error) { 476 dev_err(&client->dev, "get physical drive command failed: %d\n", 477 error); 478 return error; 479 } 480 481 phy_y = get_unaligned_be16(&resp[2]); 482 483 dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y); 484 485 if (rows == 0 || cols == 0 || osr == 0) { 486 dev_warn(&client->dev, 487 "invalid trace number data: %d, %d, %d\n", 488 rows, cols, osr); 489 } else { 490 /* translate trace number to TS resolution */ 491 ts->x_max = ELAN_TS_RESOLUTION(rows, osr); 492 ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x); 493 ts->y_max = ELAN_TS_RESOLUTION(cols, osr); 494 ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y); 495 } 496 497 return 0; 498 } 499 500 static int elants_i2c_fastboot(struct i2c_client *client) 501 { 502 const u8 boot_cmd[] = { 0x4D, 0x61, 0x69, 0x6E }; 503 int error; 504 505 error = elants_i2c_send(client, boot_cmd, sizeof(boot_cmd)); 506 if (error) { 507 dev_err(&client->dev, "boot failed: %d\n", error); 508 return error; 509 } 510 511 dev_dbg(&client->dev, "boot success -- 0x%x\n", client->addr); 512 return 0; 513 } 514 515 static int elants_i2c_initialize(struct elants_data *ts) 516 { 517 struct i2c_client *client = ts->client; 518 int error, error2, retry_cnt; 519 const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 }; 520 const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 }; 521 u8 buf[HEADER_SIZE]; 522 523 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 524 error = elants_i2c_sw_reset(client); 525 if (error) { 526 /* Continue initializing if it's the last try */ 527 if (retry_cnt < MAX_RETRIES - 1) 528 continue; 529 } 530 531 error = elants_i2c_fastboot(client); 532 if (error) { 533 /* Continue initializing if it's the last try */ 534 if (retry_cnt < MAX_RETRIES - 1) 535 continue; 536 } 537 538 /* Wait for Hello packet */ 539 msleep(BOOT_TIME_DELAY_MS); 540 541 error = elants_i2c_read(client, buf, sizeof(buf)); 542 if (error) { 543 dev_err(&client->dev, 544 "failed to read 'hello' packet: %d\n", error); 545 } else if (!memcmp(buf, hello_packet, sizeof(hello_packet))) { 546 ts->iap_mode = ELAN_IAP_OPERATIONAL; 547 break; 548 } else if (!memcmp(buf, recov_packet, sizeof(recov_packet))) { 549 /* 550 * Setting error code will mark device 551 * in recovery mode below. 552 */ 553 error = -EIO; 554 break; 555 } else { 556 error = -EINVAL; 557 dev_err(&client->dev, 558 "invalid 'hello' packet: %*ph\n", 559 (int)sizeof(buf), buf); 560 } 561 } 562 563 /* hw version is available even if device in recovery state */ 564 error2 = elants_i2c_query_hw_version(ts); 565 if (!error2) 566 error2 = elants_i2c_query_bc_version(ts); 567 if (!error) 568 error = error2; 569 570 if (!error) 571 error = elants_i2c_query_fw_version(ts); 572 if (!error) 573 error = elants_i2c_query_test_version(ts); 574 if (!error) 575 error = elants_i2c_query_ts_info(ts); 576 577 if (error) 578 ts->iap_mode = ELAN_IAP_RECOVERY; 579 580 return 0; 581 } 582 583 /* 584 * Firmware update interface. 585 */ 586 587 static int elants_i2c_fw_write_page(struct i2c_client *client, 588 const void *page) 589 { 590 const u8 ack_ok[] = { 0xaa, 0xaa }; 591 u8 buf[2]; 592 int retry; 593 int error; 594 595 for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) { 596 error = elants_i2c_send(client, page, ELAN_FW_PAGESIZE); 597 if (error) { 598 dev_err(&client->dev, 599 "IAP Write Page failed: %d\n", error); 600 continue; 601 } 602 603 error = elants_i2c_read(client, buf, 2); 604 if (error) { 605 dev_err(&client->dev, 606 "IAP Ack read failed: %d\n", error); 607 return error; 608 } 609 610 if (!memcmp(buf, ack_ok, sizeof(ack_ok))) 611 return 0; 612 613 error = -EIO; 614 dev_err(&client->dev, 615 "IAP Get Ack Error [%02x:%02x]\n", 616 buf[0], buf[1]); 617 } 618 619 return error; 620 } 621 622 static int elants_i2c_validate_remark_id(struct elants_data *ts, 623 const struct firmware *fw) 624 { 625 struct i2c_client *client = ts->client; 626 int error; 627 const u8 cmd[] = { CMD_HEADER_ROM_READ, 0x80, 0x1F, 0x00, 0x00, 0x21 }; 628 u8 resp[6] = { 0 }; 629 u16 ts_remark_id = 0; 630 u16 fw_remark_id = 0; 631 632 /* Compare TS Remark ID and FW Remark ID */ 633 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 634 resp, sizeof(resp)); 635 if (error) { 636 dev_err(&client->dev, "failed to query Remark ID: %d\n", error); 637 return error; 638 } 639 640 ts_remark_id = get_unaligned_be16(&resp[3]); 641 642 fw_remark_id = get_unaligned_le16(&fw->data[fw->size - 4]); 643 644 if (fw_remark_id != ts_remark_id) { 645 dev_err(&client->dev, 646 "Remark ID Mismatched: ts_remark_id=0x%04x, fw_remark_id=0x%04x.\n", 647 ts_remark_id, fw_remark_id); 648 return -EINVAL; 649 } 650 651 return 0; 652 } 653 654 static int elants_i2c_do_update_firmware(struct i2c_client *client, 655 const struct firmware *fw, 656 bool force) 657 { 658 struct elants_data *ts = i2c_get_clientdata(client); 659 const u8 enter_iap[] = { 0x45, 0x49, 0x41, 0x50 }; 660 const u8 enter_iap2[] = { 0x54, 0x00, 0x12, 0x34 }; 661 const u8 iap_ack[] = { 0x55, 0xaa, 0x33, 0xcc }; 662 const u8 close_idle[] = { 0x54, 0x2c, 0x01, 0x01 }; 663 u8 buf[HEADER_SIZE]; 664 u16 send_id; 665 int page, n_fw_pages; 666 int error; 667 bool check_remark_id = ts->iap_version >= 0x60; 668 669 /* Recovery mode detection! */ 670 if (force) { 671 dev_dbg(&client->dev, "Recovery mode procedure\n"); 672 673 if (check_remark_id) { 674 error = elants_i2c_validate_remark_id(ts, fw); 675 if (error) 676 return error; 677 } 678 679 error = elants_i2c_send(client, enter_iap2, sizeof(enter_iap2)); 680 if (error) { 681 dev_err(&client->dev, "failed to enter IAP mode: %d\n", 682 error); 683 return error; 684 } 685 } else { 686 /* Start IAP Procedure */ 687 dev_dbg(&client->dev, "Normal IAP procedure\n"); 688 689 /* Close idle mode */ 690 error = elants_i2c_send(client, close_idle, sizeof(close_idle)); 691 if (error) 692 dev_err(&client->dev, "Failed close idle: %d\n", error); 693 msleep(60); 694 695 elants_i2c_sw_reset(client); 696 msleep(20); 697 698 if (check_remark_id) { 699 error = elants_i2c_validate_remark_id(ts, fw); 700 if (error) 701 return error; 702 } 703 704 error = elants_i2c_send(client, enter_iap, sizeof(enter_iap)); 705 if (error) { 706 dev_err(&client->dev, "failed to enter IAP mode: %d\n", 707 error); 708 return error; 709 } 710 } 711 712 msleep(20); 713 714 /* check IAP state */ 715 error = elants_i2c_read(client, buf, 4); 716 if (error) { 717 dev_err(&client->dev, 718 "failed to read IAP acknowledgement: %d\n", 719 error); 720 return error; 721 } 722 723 if (memcmp(buf, iap_ack, sizeof(iap_ack))) { 724 dev_err(&client->dev, 725 "failed to enter IAP: %*ph (expected %*ph)\n", 726 (int)sizeof(buf), buf, (int)sizeof(iap_ack), iap_ack); 727 return -EIO; 728 } 729 730 dev_info(&client->dev, "successfully entered IAP mode"); 731 732 send_id = client->addr; 733 error = elants_i2c_send(client, &send_id, 1); 734 if (error) { 735 dev_err(&client->dev, "sending dummy byte failed: %d\n", 736 error); 737 return error; 738 } 739 740 /* Clear the last page of Master */ 741 error = elants_i2c_send(client, fw->data, ELAN_FW_PAGESIZE); 742 if (error) { 743 dev_err(&client->dev, "clearing of the last page failed: %d\n", 744 error); 745 return error; 746 } 747 748 error = elants_i2c_read(client, buf, 2); 749 if (error) { 750 dev_err(&client->dev, 751 "failed to read ACK for clearing the last page: %d\n", 752 error); 753 return error; 754 } 755 756 n_fw_pages = fw->size / ELAN_FW_PAGESIZE; 757 dev_dbg(&client->dev, "IAP Pages = %d\n", n_fw_pages); 758 759 for (page = 0; page < n_fw_pages; page++) { 760 error = elants_i2c_fw_write_page(client, 761 fw->data + page * ELAN_FW_PAGESIZE); 762 if (error) { 763 dev_err(&client->dev, 764 "failed to write FW page %d: %d\n", 765 page, error); 766 return error; 767 } 768 } 769 770 /* Old iap needs to wait 200ms for WDT and rest is for hello packets */ 771 msleep(300); 772 773 dev_info(&client->dev, "firmware update completed\n"); 774 return 0; 775 } 776 777 static int elants_i2c_fw_update(struct elants_data *ts) 778 { 779 struct i2c_client *client = ts->client; 780 const struct firmware *fw; 781 char *fw_name; 782 int error; 783 784 fw_name = kasprintf(GFP_KERNEL, "elants_i2c_%04x.bin", ts->hw_version); 785 if (!fw_name) 786 return -ENOMEM; 787 788 dev_info(&client->dev, "requesting fw name = %s\n", fw_name); 789 error = request_firmware(&fw, fw_name, &client->dev); 790 kfree(fw_name); 791 if (error) { 792 dev_err(&client->dev, "failed to request firmware: %d\n", 793 error); 794 return error; 795 } 796 797 if (fw->size % ELAN_FW_PAGESIZE) { 798 dev_err(&client->dev, "invalid firmware length: %zu\n", 799 fw->size); 800 error = -EINVAL; 801 goto out; 802 } 803 804 disable_irq(client->irq); 805 806 error = elants_i2c_do_update_firmware(client, fw, 807 ts->iap_mode == ELAN_IAP_RECOVERY); 808 if (error) { 809 dev_err(&client->dev, "firmware update failed: %d\n", error); 810 ts->iap_mode = ELAN_IAP_RECOVERY; 811 goto out_enable_irq; 812 } 813 814 error = elants_i2c_initialize(ts); 815 if (error) { 816 dev_err(&client->dev, 817 "failed to initialize device after firmware update: %d\n", 818 error); 819 ts->iap_mode = ELAN_IAP_RECOVERY; 820 goto out_enable_irq; 821 } 822 823 ts->iap_mode = ELAN_IAP_OPERATIONAL; 824 825 out_enable_irq: 826 ts->state = ELAN_STATE_NORMAL; 827 enable_irq(client->irq); 828 msleep(100); 829 830 if (!error) 831 elants_i2c_calibrate(ts); 832 out: 833 release_firmware(fw); 834 return error; 835 } 836 837 /* 838 * Event reporting. 839 */ 840 841 static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf) 842 { 843 struct input_dev *input = ts->input; 844 unsigned int n_fingers; 845 u16 finger_state; 846 int i; 847 848 n_fingers = buf[FW_POS_STATE + 1] & 0x0f; 849 finger_state = ((buf[FW_POS_STATE + 1] & 0x30) << 4) | 850 buf[FW_POS_STATE]; 851 852 dev_dbg(&ts->client->dev, 853 "n_fingers: %u, state: %04x\n", n_fingers, finger_state); 854 855 for (i = 0; i < MAX_CONTACT_NUM && n_fingers; i++) { 856 if (finger_state & 1) { 857 unsigned int x, y, p, w; 858 u8 *pos; 859 860 pos = &buf[FW_POS_XY + i * 3]; 861 x = (((u16)pos[0] & 0xf0) << 4) | pos[1]; 862 y = (((u16)pos[0] & 0x0f) << 8) | pos[2]; 863 p = buf[FW_POS_PRESSURE + i]; 864 w = buf[FW_POS_WIDTH + i]; 865 866 dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n", 867 i, x, y, p, w); 868 869 input_mt_slot(input, i); 870 input_mt_report_slot_state(input, MT_TOOL_FINGER, true); 871 input_event(input, EV_ABS, ABS_MT_POSITION_X, x); 872 input_event(input, EV_ABS, ABS_MT_POSITION_Y, y); 873 input_event(input, EV_ABS, ABS_MT_PRESSURE, p); 874 input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w); 875 876 n_fingers--; 877 } 878 879 finger_state >>= 1; 880 } 881 882 input_mt_sync_frame(input); 883 input_sync(input); 884 } 885 886 static u8 elants_i2c_calculate_checksum(u8 *buf) 887 { 888 u8 checksum = 0; 889 u8 i; 890 891 for (i = 0; i < FW_POS_CHECKSUM; i++) 892 checksum += buf[i]; 893 894 return checksum; 895 } 896 897 static void elants_i2c_event(struct elants_data *ts, u8 *buf) 898 { 899 u8 checksum = elants_i2c_calculate_checksum(buf); 900 901 if (unlikely(buf[FW_POS_CHECKSUM] != checksum)) 902 dev_warn(&ts->client->dev, 903 "%s: invalid checksum for packet %02x: %02x vs. %02x\n", 904 __func__, buf[FW_POS_HEADER], 905 checksum, buf[FW_POS_CHECKSUM]); 906 else if (unlikely(buf[FW_POS_HEADER] != HEADER_REPORT_10_FINGER)) 907 dev_warn(&ts->client->dev, 908 "%s: unknown packet type: %02x\n", 909 __func__, buf[FW_POS_HEADER]); 910 else 911 elants_i2c_mt_event(ts, buf); 912 } 913 914 static irqreturn_t elants_i2c_irq(int irq, void *_dev) 915 { 916 const u8 wait_packet[] = { 0x64, 0x64, 0x64, 0x64 }; 917 struct elants_data *ts = _dev; 918 struct i2c_client *client = ts->client; 919 int report_count, report_len; 920 int i; 921 int len; 922 923 len = i2c_master_recv_dmasafe(client, ts->buf, sizeof(ts->buf)); 924 if (len < 0) { 925 dev_err(&client->dev, "%s: failed to read data: %d\n", 926 __func__, len); 927 goto out; 928 } 929 930 dev_dbg(&client->dev, "%s: packet %*ph\n", 931 __func__, HEADER_SIZE, ts->buf); 932 933 switch (ts->state) { 934 case ELAN_WAIT_RECALIBRATION: 935 if (ts->buf[FW_HDR_TYPE] == CMD_HEADER_REK) { 936 memcpy(ts->cmd_resp, ts->buf, sizeof(ts->cmd_resp)); 937 complete(&ts->cmd_done); 938 ts->state = ELAN_STATE_NORMAL; 939 } 940 break; 941 942 case ELAN_WAIT_QUEUE_HEADER: 943 if (ts->buf[FW_HDR_TYPE] != QUEUE_HEADER_NORMAL) 944 break; 945 946 ts->state = ELAN_STATE_NORMAL; 947 /* fall through */ 948 949 case ELAN_STATE_NORMAL: 950 951 switch (ts->buf[FW_HDR_TYPE]) { 952 case CMD_HEADER_HELLO: 953 case CMD_HEADER_RESP: 954 case CMD_HEADER_REK: 955 break; 956 957 case QUEUE_HEADER_WAIT: 958 if (memcmp(ts->buf, wait_packet, sizeof(wait_packet))) { 959 dev_err(&client->dev, 960 "invalid wait packet %*ph\n", 961 HEADER_SIZE, ts->buf); 962 } else { 963 ts->state = ELAN_WAIT_QUEUE_HEADER; 964 udelay(30); 965 } 966 break; 967 968 case QUEUE_HEADER_SINGLE: 969 elants_i2c_event(ts, &ts->buf[HEADER_SIZE]); 970 break; 971 972 case QUEUE_HEADER_NORMAL: 973 report_count = ts->buf[FW_HDR_COUNT]; 974 if (report_count == 0 || report_count > 3) { 975 dev_err(&client->dev, 976 "bad report count: %*ph\n", 977 HEADER_SIZE, ts->buf); 978 break; 979 } 980 981 report_len = ts->buf[FW_HDR_LENGTH] / report_count; 982 if (report_len != PACKET_SIZE) { 983 dev_err(&client->dev, 984 "mismatching report length: %*ph\n", 985 HEADER_SIZE, ts->buf); 986 break; 987 } 988 989 for (i = 0; i < report_count; i++) { 990 u8 *buf = ts->buf + HEADER_SIZE + 991 i * PACKET_SIZE; 992 elants_i2c_event(ts, buf); 993 } 994 break; 995 996 default: 997 dev_err(&client->dev, "unknown packet %*ph\n", 998 HEADER_SIZE, ts->buf); 999 break; 1000 } 1001 break; 1002 } 1003 1004 out: 1005 return IRQ_HANDLED; 1006 } 1007 1008 /* 1009 * sysfs interface 1010 */ 1011 static ssize_t calibrate_store(struct device *dev, 1012 struct device_attribute *attr, 1013 const char *buf, size_t count) 1014 { 1015 struct i2c_client *client = to_i2c_client(dev); 1016 struct elants_data *ts = i2c_get_clientdata(client); 1017 int error; 1018 1019 error = mutex_lock_interruptible(&ts->sysfs_mutex); 1020 if (error) 1021 return error; 1022 1023 error = elants_i2c_calibrate(ts); 1024 1025 mutex_unlock(&ts->sysfs_mutex); 1026 return error ?: count; 1027 } 1028 1029 static ssize_t write_update_fw(struct device *dev, 1030 struct device_attribute *attr, 1031 const char *buf, size_t count) 1032 { 1033 struct i2c_client *client = to_i2c_client(dev); 1034 struct elants_data *ts = i2c_get_clientdata(client); 1035 int error; 1036 1037 error = mutex_lock_interruptible(&ts->sysfs_mutex); 1038 if (error) 1039 return error; 1040 1041 error = elants_i2c_fw_update(ts); 1042 dev_dbg(dev, "firmware update result: %d\n", error); 1043 1044 mutex_unlock(&ts->sysfs_mutex); 1045 return error ?: count; 1046 } 1047 1048 static ssize_t show_iap_mode(struct device *dev, 1049 struct device_attribute *attr, char *buf) 1050 { 1051 struct i2c_client *client = to_i2c_client(dev); 1052 struct elants_data *ts = i2c_get_clientdata(client); 1053 1054 return sprintf(buf, "%s\n", 1055 ts->iap_mode == ELAN_IAP_OPERATIONAL ? 1056 "Normal" : "Recovery"); 1057 } 1058 1059 static DEVICE_ATTR_WO(calibrate); 1060 static DEVICE_ATTR(iap_mode, S_IRUGO, show_iap_mode, NULL); 1061 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw); 1062 1063 struct elants_version_attribute { 1064 struct device_attribute dattr; 1065 size_t field_offset; 1066 size_t field_size; 1067 }; 1068 1069 #define __ELANTS_FIELD_SIZE(_field) \ 1070 sizeof(((struct elants_data *)NULL)->_field) 1071 #define __ELANTS_VERIFY_SIZE(_field) \ 1072 (BUILD_BUG_ON_ZERO(__ELANTS_FIELD_SIZE(_field) > 2) + \ 1073 __ELANTS_FIELD_SIZE(_field)) 1074 #define ELANTS_VERSION_ATTR(_field) \ 1075 struct elants_version_attribute elants_ver_attr_##_field = { \ 1076 .dattr = __ATTR(_field, S_IRUGO, \ 1077 elants_version_attribute_show, NULL), \ 1078 .field_offset = offsetof(struct elants_data, _field), \ 1079 .field_size = __ELANTS_VERIFY_SIZE(_field), \ 1080 } 1081 1082 static ssize_t elants_version_attribute_show(struct device *dev, 1083 struct device_attribute *dattr, 1084 char *buf) 1085 { 1086 struct i2c_client *client = to_i2c_client(dev); 1087 struct elants_data *ts = i2c_get_clientdata(client); 1088 struct elants_version_attribute *attr = 1089 container_of(dattr, struct elants_version_attribute, dattr); 1090 u8 *field = (u8 *)((char *)ts + attr->field_offset); 1091 unsigned int fmt_size; 1092 unsigned int val; 1093 1094 if (attr->field_size == 1) { 1095 val = *field; 1096 fmt_size = 2; /* 2 HEX digits */ 1097 } else { 1098 val = *(u16 *)field; 1099 fmt_size = 4; /* 4 HEX digits */ 1100 } 1101 1102 return sprintf(buf, "%0*x\n", fmt_size, val); 1103 } 1104 1105 static ELANTS_VERSION_ATTR(fw_version); 1106 static ELANTS_VERSION_ATTR(hw_version); 1107 static ELANTS_VERSION_ATTR(test_version); 1108 static ELANTS_VERSION_ATTR(solution_version); 1109 static ELANTS_VERSION_ATTR(bc_version); 1110 static ELANTS_VERSION_ATTR(iap_version); 1111 1112 static struct attribute *elants_attributes[] = { 1113 &dev_attr_calibrate.attr, 1114 &dev_attr_update_fw.attr, 1115 &dev_attr_iap_mode.attr, 1116 1117 &elants_ver_attr_fw_version.dattr.attr, 1118 &elants_ver_attr_hw_version.dattr.attr, 1119 &elants_ver_attr_test_version.dattr.attr, 1120 &elants_ver_attr_solution_version.dattr.attr, 1121 &elants_ver_attr_bc_version.dattr.attr, 1122 &elants_ver_attr_iap_version.dattr.attr, 1123 NULL 1124 }; 1125 1126 static const struct attribute_group elants_attribute_group = { 1127 .attrs = elants_attributes, 1128 }; 1129 1130 static int elants_i2c_power_on(struct elants_data *ts) 1131 { 1132 int error; 1133 1134 /* 1135 * If we do not have reset gpio assume platform firmware 1136 * controls regulators and does power them on for us. 1137 */ 1138 if (IS_ERR_OR_NULL(ts->reset_gpio)) 1139 return 0; 1140 1141 gpiod_set_value_cansleep(ts->reset_gpio, 1); 1142 1143 error = regulator_enable(ts->vcc33); 1144 if (error) { 1145 dev_err(&ts->client->dev, 1146 "failed to enable vcc33 regulator: %d\n", 1147 error); 1148 goto release_reset_gpio; 1149 } 1150 1151 error = regulator_enable(ts->vccio); 1152 if (error) { 1153 dev_err(&ts->client->dev, 1154 "failed to enable vccio regulator: %d\n", 1155 error); 1156 regulator_disable(ts->vcc33); 1157 goto release_reset_gpio; 1158 } 1159 1160 /* 1161 * We need to wait a bit after powering on controller before 1162 * we are allowed to release reset GPIO. 1163 */ 1164 udelay(ELAN_POWERON_DELAY_USEC); 1165 1166 release_reset_gpio: 1167 gpiod_set_value_cansleep(ts->reset_gpio, 0); 1168 if (error) 1169 return error; 1170 1171 msleep(ELAN_RESET_DELAY_MSEC); 1172 1173 return 0; 1174 } 1175 1176 static void elants_i2c_power_off(void *_data) 1177 { 1178 struct elants_data *ts = _data; 1179 1180 if (!IS_ERR_OR_NULL(ts->reset_gpio)) { 1181 /* 1182 * Activate reset gpio to prevent leakage through the 1183 * pin once we shut off power to the controller. 1184 */ 1185 gpiod_set_value_cansleep(ts->reset_gpio, 1); 1186 regulator_disable(ts->vccio); 1187 regulator_disable(ts->vcc33); 1188 } 1189 } 1190 1191 static int elants_i2c_probe(struct i2c_client *client, 1192 const struct i2c_device_id *id) 1193 { 1194 union i2c_smbus_data dummy; 1195 struct elants_data *ts; 1196 unsigned long irqflags; 1197 int error; 1198 1199 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { 1200 dev_err(&client->dev, 1201 "%s: i2c check functionality error\n", DEVICE_NAME); 1202 return -ENXIO; 1203 } 1204 1205 ts = devm_kzalloc(&client->dev, sizeof(struct elants_data), GFP_KERNEL); 1206 if (!ts) 1207 return -ENOMEM; 1208 1209 mutex_init(&ts->sysfs_mutex); 1210 init_completion(&ts->cmd_done); 1211 1212 ts->client = client; 1213 i2c_set_clientdata(client, ts); 1214 1215 ts->vcc33 = devm_regulator_get(&client->dev, "vcc33"); 1216 if (IS_ERR(ts->vcc33)) { 1217 error = PTR_ERR(ts->vcc33); 1218 if (error != -EPROBE_DEFER) 1219 dev_err(&client->dev, 1220 "Failed to get 'vcc33' regulator: %d\n", 1221 error); 1222 return error; 1223 } 1224 1225 ts->vccio = devm_regulator_get(&client->dev, "vccio"); 1226 if (IS_ERR(ts->vccio)) { 1227 error = PTR_ERR(ts->vccio); 1228 if (error != -EPROBE_DEFER) 1229 dev_err(&client->dev, 1230 "Failed to get 'vccio' regulator: %d\n", 1231 error); 1232 return error; 1233 } 1234 1235 ts->reset_gpio = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW); 1236 if (IS_ERR(ts->reset_gpio)) { 1237 error = PTR_ERR(ts->reset_gpio); 1238 1239 if (error == -EPROBE_DEFER) 1240 return error; 1241 1242 if (error != -ENOENT && error != -ENOSYS) { 1243 dev_err(&client->dev, 1244 "failed to get reset gpio: %d\n", 1245 error); 1246 return error; 1247 } 1248 1249 ts->keep_power_in_suspend = true; 1250 } 1251 1252 error = elants_i2c_power_on(ts); 1253 if (error) 1254 return error; 1255 1256 error = devm_add_action(&client->dev, elants_i2c_power_off, ts); 1257 if (error) { 1258 dev_err(&client->dev, 1259 "failed to install power off action: %d\n", error); 1260 elants_i2c_power_off(ts); 1261 return error; 1262 } 1263 1264 /* Make sure there is something at this address */ 1265 if (i2c_smbus_xfer(client->adapter, client->addr, 0, 1266 I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) { 1267 dev_err(&client->dev, "nothing at this address\n"); 1268 return -ENXIO; 1269 } 1270 1271 error = elants_i2c_initialize(ts); 1272 if (error) { 1273 dev_err(&client->dev, "failed to initialize: %d\n", error); 1274 return error; 1275 } 1276 1277 ts->input = devm_input_allocate_device(&client->dev); 1278 if (!ts->input) { 1279 dev_err(&client->dev, "Failed to allocate input device\n"); 1280 return -ENOMEM; 1281 } 1282 1283 ts->input->name = "Elan Touchscreen"; 1284 ts->input->id.bustype = BUS_I2C; 1285 1286 __set_bit(BTN_TOUCH, ts->input->keybit); 1287 __set_bit(EV_ABS, ts->input->evbit); 1288 __set_bit(EV_KEY, ts->input->evbit); 1289 1290 /* Single touch input params setup */ 1291 input_set_abs_params(ts->input, ABS_X, 0, ts->x_max, 0, 0); 1292 input_set_abs_params(ts->input, ABS_Y, 0, ts->y_max, 0, 0); 1293 input_set_abs_params(ts->input, ABS_PRESSURE, 0, 255, 0, 0); 1294 input_abs_set_res(ts->input, ABS_X, ts->x_res); 1295 input_abs_set_res(ts->input, ABS_Y, ts->y_res); 1296 1297 /* Multitouch input params setup */ 1298 error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM, 1299 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); 1300 if (error) { 1301 dev_err(&client->dev, 1302 "failed to initialize MT slots: %d\n", error); 1303 return error; 1304 } 1305 1306 input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0); 1307 input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0); 1308 input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); 1309 input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0); 1310 input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res); 1311 input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res); 1312 1313 error = input_register_device(ts->input); 1314 if (error) { 1315 dev_err(&client->dev, 1316 "unable to register input device: %d\n", error); 1317 return error; 1318 } 1319 1320 /* 1321 * Platform code (ACPI, DTS) should normally set up interrupt 1322 * for us, but in case it did not let's fall back to using falling 1323 * edge to be compatible with older Chromebooks. 1324 */ 1325 irqflags = irq_get_trigger_type(client->irq); 1326 if (!irqflags) 1327 irqflags = IRQF_TRIGGER_FALLING; 1328 1329 error = devm_request_threaded_irq(&client->dev, client->irq, 1330 NULL, elants_i2c_irq, 1331 irqflags | IRQF_ONESHOT, 1332 client->name, ts); 1333 if (error) { 1334 dev_err(&client->dev, "Failed to register interrupt\n"); 1335 return error; 1336 } 1337 1338 /* 1339 * Systems using device tree should set up wakeup via DTS, 1340 * the rest will configure device as wakeup source by default. 1341 */ 1342 if (!client->dev.of_node) 1343 device_init_wakeup(&client->dev, true); 1344 1345 error = devm_device_add_group(&client->dev, &elants_attribute_group); 1346 if (error) { 1347 dev_err(&client->dev, "failed to create sysfs attributes: %d\n", 1348 error); 1349 return error; 1350 } 1351 1352 return 0; 1353 } 1354 1355 static int __maybe_unused elants_i2c_suspend(struct device *dev) 1356 { 1357 struct i2c_client *client = to_i2c_client(dev); 1358 struct elants_data *ts = i2c_get_clientdata(client); 1359 const u8 set_sleep_cmd[] = { 0x54, 0x50, 0x00, 0x01 }; 1360 int retry_cnt; 1361 int error; 1362 1363 /* Command not support in IAP recovery mode */ 1364 if (ts->iap_mode != ELAN_IAP_OPERATIONAL) 1365 return -EBUSY; 1366 1367 disable_irq(client->irq); 1368 1369 if (device_may_wakeup(dev)) { 1370 /* 1371 * The device will automatically enter idle mode 1372 * that has reduced power consumption. 1373 */ 1374 ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0); 1375 } else if (ts->keep_power_in_suspend) { 1376 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 1377 error = elants_i2c_send(client, set_sleep_cmd, 1378 sizeof(set_sleep_cmd)); 1379 if (!error) 1380 break; 1381 1382 dev_err(&client->dev, 1383 "suspend command failed: %d\n", error); 1384 } 1385 } else { 1386 elants_i2c_power_off(ts); 1387 } 1388 1389 return 0; 1390 } 1391 1392 static int __maybe_unused elants_i2c_resume(struct device *dev) 1393 { 1394 struct i2c_client *client = to_i2c_client(dev); 1395 struct elants_data *ts = i2c_get_clientdata(client); 1396 const u8 set_active_cmd[] = { 0x54, 0x58, 0x00, 0x01 }; 1397 int retry_cnt; 1398 int error; 1399 1400 if (device_may_wakeup(dev)) { 1401 if (ts->wake_irq_enabled) 1402 disable_irq_wake(client->irq); 1403 elants_i2c_sw_reset(client); 1404 } else if (ts->keep_power_in_suspend) { 1405 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 1406 error = elants_i2c_send(client, set_active_cmd, 1407 sizeof(set_active_cmd)); 1408 if (!error) 1409 break; 1410 1411 dev_err(&client->dev, 1412 "resume command failed: %d\n", error); 1413 } 1414 } else { 1415 elants_i2c_power_on(ts); 1416 elants_i2c_initialize(ts); 1417 } 1418 1419 ts->state = ELAN_STATE_NORMAL; 1420 enable_irq(client->irq); 1421 1422 return 0; 1423 } 1424 1425 static SIMPLE_DEV_PM_OPS(elants_i2c_pm_ops, 1426 elants_i2c_suspend, elants_i2c_resume); 1427 1428 static const struct i2c_device_id elants_i2c_id[] = { 1429 { DEVICE_NAME, 0 }, 1430 { } 1431 }; 1432 MODULE_DEVICE_TABLE(i2c, elants_i2c_id); 1433 1434 #ifdef CONFIG_ACPI 1435 static const struct acpi_device_id elants_acpi_id[] = { 1436 { "ELAN0001", 0 }, 1437 { } 1438 }; 1439 MODULE_DEVICE_TABLE(acpi, elants_acpi_id); 1440 #endif 1441 1442 #ifdef CONFIG_OF 1443 static const struct of_device_id elants_of_match[] = { 1444 { .compatible = "elan,ekth3500" }, 1445 { /* sentinel */ } 1446 }; 1447 MODULE_DEVICE_TABLE(of, elants_of_match); 1448 #endif 1449 1450 static struct i2c_driver elants_i2c_driver = { 1451 .probe = elants_i2c_probe, 1452 .id_table = elants_i2c_id, 1453 .driver = { 1454 .name = DEVICE_NAME, 1455 .pm = &elants_i2c_pm_ops, 1456 .acpi_match_table = ACPI_PTR(elants_acpi_id), 1457 .of_match_table = of_match_ptr(elants_of_match), 1458 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1459 }, 1460 }; 1461 module_i2c_driver(elants_i2c_driver); 1462 1463 MODULE_AUTHOR("Scott Liu <scott.liu@emc.com.tw>"); 1464 MODULE_DESCRIPTION("Elan I2c Touchscreen driver"); 1465 MODULE_LICENSE("GPL"); 1466