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/bits.h> 23 #include <linux/module.h> 24 #include <linux/input.h> 25 #include <linux/interrupt.h> 26 #include <linux/irq.h> 27 #include <linux/platform_device.h> 28 #include <linux/async.h> 29 #include <linux/i2c.h> 30 #include <linux/delay.h> 31 #include <linux/uaccess.h> 32 #include <linux/buffer_head.h> 33 #include <linux/slab.h> 34 #include <linux/firmware.h> 35 #include <linux/input/mt.h> 36 #include <linux/acpi.h> 37 #include <linux/of.h> 38 #include <linux/gpio/consumer.h> 39 #include <linux/regulator/consumer.h> 40 #include <asm/unaligned.h> 41 42 /* Device, Driver information */ 43 #define DEVICE_NAME "elants_i2c" 44 45 /* Convert from rows or columns into resolution */ 46 #define ELAN_TS_RESOLUTION(n, m) (((n) - 1) * (m)) 47 48 /* FW header data */ 49 #define HEADER_SIZE 4 50 #define FW_HDR_TYPE 0 51 #define FW_HDR_COUNT 1 52 #define FW_HDR_LENGTH 2 53 54 /* Buffer mode Queue Header information */ 55 #define QUEUE_HEADER_SINGLE 0x62 56 #define QUEUE_HEADER_NORMAL 0X63 57 #define QUEUE_HEADER_WAIT 0x64 58 59 /* Command header definition */ 60 #define CMD_HEADER_WRITE 0x54 61 #define CMD_HEADER_READ 0x53 62 #define CMD_HEADER_6B_READ 0x5B 63 #define CMD_HEADER_ROM_READ 0x96 64 #define CMD_HEADER_RESP 0x52 65 #define CMD_HEADER_6B_RESP 0x9B 66 #define CMD_HEADER_ROM_RESP 0x95 67 #define CMD_HEADER_HELLO 0x55 68 #define CMD_HEADER_REK 0x66 69 70 /* FW position data */ 71 #define PACKET_SIZE 55 72 #define MAX_CONTACT_NUM 10 73 #define FW_POS_HEADER 0 74 #define FW_POS_STATE 1 75 #define FW_POS_TOTAL 2 76 #define FW_POS_XY 3 77 #define FW_POS_TOOL_TYPE 33 78 #define FW_POS_CHECKSUM 34 79 #define FW_POS_WIDTH 35 80 #define FW_POS_PRESSURE 45 81 82 #define HEADER_REPORT_10_FINGER 0x62 83 84 /* Header (4 bytes) plus 3 fill 10-finger packets */ 85 #define MAX_PACKET_SIZE 169 86 87 #define BOOT_TIME_DELAY_MS 50 88 89 /* FW read command, 0x53 0x?? 0x0, 0x01 */ 90 #define E_ELAN_INFO_FW_VER 0x00 91 #define E_ELAN_INFO_BC_VER 0x10 92 #define E_ELAN_INFO_TEST_VER 0xE0 93 #define E_ELAN_INFO_FW_ID 0xF0 94 #define E_INFO_OSR 0xD6 95 #define E_INFO_PHY_SCAN 0xD7 96 #define E_INFO_PHY_DRIVER 0xD8 97 98 #define MAX_RETRIES 3 99 #define MAX_FW_UPDATE_RETRIES 30 100 101 #define ELAN_FW_PAGESIZE 132 102 103 /* calibration timeout definition */ 104 #define ELAN_CALI_TIMEOUT_MSEC 12000 105 106 #define ELAN_POWERON_DELAY_USEC 500 107 #define ELAN_RESET_DELAY_MSEC 20 108 109 enum elants_state { 110 ELAN_STATE_NORMAL, 111 ELAN_WAIT_QUEUE_HEADER, 112 ELAN_WAIT_RECALIBRATION, 113 }; 114 115 enum elants_iap_mode { 116 ELAN_IAP_OPERATIONAL, 117 ELAN_IAP_RECOVERY, 118 }; 119 120 /* struct elants_data - represents state of Elan touchscreen device */ 121 struct elants_data { 122 struct i2c_client *client; 123 struct input_dev *input; 124 125 struct regulator *vcc33; 126 struct regulator *vccio; 127 struct gpio_desc *reset_gpio; 128 129 u16 fw_version; 130 u8 test_version; 131 u8 solution_version; 132 u8 bc_version; 133 u8 iap_version; 134 u16 hw_version; 135 unsigned int x_res; /* resolution in units/mm */ 136 unsigned int y_res; 137 unsigned int x_max; 138 unsigned int y_max; 139 140 enum elants_state state; 141 enum elants_iap_mode iap_mode; 142 143 /* Guards against concurrent access to the device via sysfs */ 144 struct mutex sysfs_mutex; 145 146 u8 cmd_resp[HEADER_SIZE]; 147 struct completion cmd_done; 148 149 bool wake_irq_enabled; 150 bool keep_power_in_suspend; 151 152 /* Must be last to be used for DMA operations */ 153 u8 buf[MAX_PACKET_SIZE] ____cacheline_aligned; 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 case CMD_HEADER_ROM_READ: 208 expected_response = CMD_HEADER_ROM_RESP; 209 break; 210 211 default: 212 dev_err(&client->dev, "%s: invalid command %*ph\n", 213 __func__, (int)cmd_size, cmd); 214 return -EINVAL; 215 } 216 217 msgs[0].addr = client->addr; 218 msgs[0].flags = client->flags & I2C_M_TEN; 219 msgs[0].len = cmd_size; 220 msgs[0].buf = (u8 *)cmd; 221 222 msgs[1].addr = client->addr; 223 msgs[1].flags = client->flags & I2C_M_TEN; 224 msgs[1].flags |= I2C_M_RD; 225 msgs[1].len = resp_size; 226 msgs[1].buf = resp; 227 228 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 229 if (ret < 0) 230 return ret; 231 232 if (ret != ARRAY_SIZE(msgs) || resp[FW_HDR_TYPE] != expected_response) 233 return -EIO; 234 235 return 0; 236 } 237 238 static int elants_i2c_calibrate(struct elants_data *ts) 239 { 240 struct i2c_client *client = ts->client; 241 int ret, error; 242 static const u8 w_flashkey[] = { 0x54, 0xC0, 0xE1, 0x5A }; 243 static const u8 rek[] = { 0x54, 0x29, 0x00, 0x01 }; 244 static const u8 rek_resp[] = { CMD_HEADER_REK, 0x66, 0x66, 0x66 }; 245 246 disable_irq(client->irq); 247 248 ts->state = ELAN_WAIT_RECALIBRATION; 249 reinit_completion(&ts->cmd_done); 250 251 elants_i2c_send(client, w_flashkey, sizeof(w_flashkey)); 252 elants_i2c_send(client, rek, sizeof(rek)); 253 254 enable_irq(client->irq); 255 256 ret = wait_for_completion_interruptible_timeout(&ts->cmd_done, 257 msecs_to_jiffies(ELAN_CALI_TIMEOUT_MSEC)); 258 259 ts->state = ELAN_STATE_NORMAL; 260 261 if (ret <= 0) { 262 error = ret < 0 ? ret : -ETIMEDOUT; 263 dev_err(&client->dev, 264 "error while waiting for calibration to complete: %d\n", 265 error); 266 return error; 267 } 268 269 if (memcmp(rek_resp, ts->cmd_resp, sizeof(rek_resp))) { 270 dev_err(&client->dev, 271 "unexpected calibration response: %*ph\n", 272 (int)sizeof(ts->cmd_resp), ts->cmd_resp); 273 return -EINVAL; 274 } 275 276 return 0; 277 } 278 279 static int elants_i2c_sw_reset(struct i2c_client *client) 280 { 281 const u8 soft_rst_cmd[] = { 0x77, 0x77, 0x77, 0x77 }; 282 int error; 283 284 error = elants_i2c_send(client, soft_rst_cmd, 285 sizeof(soft_rst_cmd)); 286 if (error) { 287 dev_err(&client->dev, "software reset failed: %d\n", error); 288 return error; 289 } 290 291 /* 292 * We should wait at least 10 msec (but no more than 40) before 293 * sending fastboot or IAP command to the device. 294 */ 295 msleep(30); 296 297 return 0; 298 } 299 300 static u16 elants_i2c_parse_version(u8 *buf) 301 { 302 return get_unaligned_be32(buf) >> 4; 303 } 304 305 static int elants_i2c_query_hw_version(struct elants_data *ts) 306 { 307 struct i2c_client *client = ts->client; 308 int error, retry_cnt; 309 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 }; 310 u8 resp[HEADER_SIZE]; 311 312 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 313 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 314 resp, sizeof(resp)); 315 if (!error) { 316 ts->hw_version = elants_i2c_parse_version(resp); 317 if (ts->hw_version != 0xffff) 318 return 0; 319 } 320 321 dev_dbg(&client->dev, "read fw id error=%d, buf=%*phC\n", 322 error, (int)sizeof(resp), resp); 323 } 324 325 if (error) { 326 dev_err(&client->dev, 327 "Failed to read fw id: %d\n", error); 328 return error; 329 } 330 331 dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version); 332 333 return -EINVAL; 334 } 335 336 static int elants_i2c_query_fw_version(struct elants_data *ts) 337 { 338 struct i2c_client *client = ts->client; 339 int error, retry_cnt; 340 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 }; 341 u8 resp[HEADER_SIZE]; 342 343 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 344 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 345 resp, sizeof(resp)); 346 if (!error) { 347 ts->fw_version = elants_i2c_parse_version(resp); 348 if (ts->fw_version != 0x0000 && 349 ts->fw_version != 0xffff) 350 return 0; 351 } 352 353 dev_dbg(&client->dev, "read fw version error=%d, buf=%*phC\n", 354 error, (int)sizeof(resp), resp); 355 } 356 357 dev_err(&client->dev, 358 "Failed to read fw version or fw version is invalid\n"); 359 360 return -EINVAL; 361 } 362 363 static int elants_i2c_query_test_version(struct elants_data *ts) 364 { 365 struct i2c_client *client = ts->client; 366 int error, retry_cnt; 367 u16 version; 368 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 }; 369 u8 resp[HEADER_SIZE]; 370 371 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 372 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 373 resp, sizeof(resp)); 374 if (!error) { 375 version = elants_i2c_parse_version(resp); 376 ts->test_version = version >> 8; 377 ts->solution_version = version & 0xff; 378 379 return 0; 380 } 381 382 dev_dbg(&client->dev, 383 "read test version error rc=%d, buf=%*phC\n", 384 error, (int)sizeof(resp), resp); 385 } 386 387 dev_err(&client->dev, "Failed to read test version\n"); 388 389 return -EINVAL; 390 } 391 392 static int elants_i2c_query_bc_version(struct elants_data *ts) 393 { 394 struct i2c_client *client = ts->client; 395 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_BC_VER, 0x00, 0x01 }; 396 u8 resp[HEADER_SIZE]; 397 u16 version; 398 int error; 399 400 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 401 resp, sizeof(resp)); 402 if (error) { 403 dev_err(&client->dev, 404 "read BC version error=%d, buf=%*phC\n", 405 error, (int)sizeof(resp), resp); 406 return error; 407 } 408 409 version = elants_i2c_parse_version(resp); 410 ts->bc_version = version >> 8; 411 ts->iap_version = version & 0xff; 412 413 return 0; 414 } 415 416 static int elants_i2c_query_ts_info(struct elants_data *ts) 417 { 418 struct i2c_client *client = ts->client; 419 int error; 420 u8 resp[17]; 421 u16 phy_x, phy_y, rows, cols, osr; 422 const u8 get_resolution_cmd[] = { 423 CMD_HEADER_6B_READ, 0x00, 0x00, 0x00, 0x00, 0x00 424 }; 425 const u8 get_osr_cmd[] = { 426 CMD_HEADER_READ, E_INFO_OSR, 0x00, 0x01 427 }; 428 const u8 get_physical_scan_cmd[] = { 429 CMD_HEADER_READ, E_INFO_PHY_SCAN, 0x00, 0x01 430 }; 431 const u8 get_physical_drive_cmd[] = { 432 CMD_HEADER_READ, E_INFO_PHY_DRIVER, 0x00, 0x01 433 }; 434 435 /* Get trace number */ 436 error = elants_i2c_execute_command(client, 437 get_resolution_cmd, 438 sizeof(get_resolution_cmd), 439 resp, sizeof(resp)); 440 if (error) { 441 dev_err(&client->dev, "get resolution command failed: %d\n", 442 error); 443 return error; 444 } 445 446 rows = resp[2] + resp[6] + resp[10]; 447 cols = resp[3] + resp[7] + resp[11]; 448 449 /* Process mm_to_pixel information */ 450 error = elants_i2c_execute_command(client, 451 get_osr_cmd, sizeof(get_osr_cmd), 452 resp, sizeof(resp)); 453 if (error) { 454 dev_err(&client->dev, "get osr command failed: %d\n", 455 error); 456 return error; 457 } 458 459 osr = resp[3]; 460 461 error = elants_i2c_execute_command(client, 462 get_physical_scan_cmd, 463 sizeof(get_physical_scan_cmd), 464 resp, sizeof(resp)); 465 if (error) { 466 dev_err(&client->dev, "get physical scan command failed: %d\n", 467 error); 468 return error; 469 } 470 471 phy_x = get_unaligned_be16(&resp[2]); 472 473 error = elants_i2c_execute_command(client, 474 get_physical_drive_cmd, 475 sizeof(get_physical_drive_cmd), 476 resp, sizeof(resp)); 477 if (error) { 478 dev_err(&client->dev, "get physical drive command failed: %d\n", 479 error); 480 return error; 481 } 482 483 phy_y = get_unaligned_be16(&resp[2]); 484 485 dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y); 486 487 if (rows == 0 || cols == 0 || osr == 0) { 488 dev_warn(&client->dev, 489 "invalid trace number data: %d, %d, %d\n", 490 rows, cols, osr); 491 } else { 492 /* translate trace number to TS resolution */ 493 ts->x_max = ELAN_TS_RESOLUTION(rows, osr); 494 ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x); 495 ts->y_max = ELAN_TS_RESOLUTION(cols, osr); 496 ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y); 497 } 498 499 return 0; 500 } 501 502 static int elants_i2c_fastboot(struct i2c_client *client) 503 { 504 const u8 boot_cmd[] = { 0x4D, 0x61, 0x69, 0x6E }; 505 int error; 506 507 error = elants_i2c_send(client, boot_cmd, sizeof(boot_cmd)); 508 if (error) { 509 dev_err(&client->dev, "boot failed: %d\n", error); 510 return error; 511 } 512 513 dev_dbg(&client->dev, "boot success -- 0x%x\n", client->addr); 514 return 0; 515 } 516 517 static int elants_i2c_initialize(struct elants_data *ts) 518 { 519 struct i2c_client *client = ts->client; 520 int error, error2, retry_cnt; 521 const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 }; 522 const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 }; 523 u8 buf[HEADER_SIZE]; 524 525 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 526 error = elants_i2c_sw_reset(client); 527 if (error) { 528 /* Continue initializing if it's the last try */ 529 if (retry_cnt < MAX_RETRIES - 1) 530 continue; 531 } 532 533 error = elants_i2c_fastboot(client); 534 if (error) { 535 /* Continue initializing if it's the last try */ 536 if (retry_cnt < MAX_RETRIES - 1) 537 continue; 538 } 539 540 /* Wait for Hello packet */ 541 msleep(BOOT_TIME_DELAY_MS); 542 543 error = elants_i2c_read(client, buf, sizeof(buf)); 544 if (error) { 545 dev_err(&client->dev, 546 "failed to read 'hello' packet: %d\n", error); 547 } else if (!memcmp(buf, hello_packet, sizeof(hello_packet))) { 548 ts->iap_mode = ELAN_IAP_OPERATIONAL; 549 break; 550 } else if (!memcmp(buf, recov_packet, sizeof(recov_packet))) { 551 /* 552 * Setting error code will mark device 553 * in recovery mode below. 554 */ 555 error = -EIO; 556 break; 557 } else { 558 error = -EINVAL; 559 dev_err(&client->dev, 560 "invalid 'hello' packet: %*ph\n", 561 (int)sizeof(buf), buf); 562 } 563 } 564 565 /* hw version is available even if device in recovery state */ 566 error2 = elants_i2c_query_hw_version(ts); 567 if (!error2) 568 error2 = elants_i2c_query_bc_version(ts); 569 if (!error) 570 error = error2; 571 572 if (!error) 573 error = elants_i2c_query_fw_version(ts); 574 if (!error) 575 error = elants_i2c_query_test_version(ts); 576 if (!error) 577 error = elants_i2c_query_ts_info(ts); 578 579 if (error) 580 ts->iap_mode = ELAN_IAP_RECOVERY; 581 582 return 0; 583 } 584 585 /* 586 * Firmware update interface. 587 */ 588 589 static int elants_i2c_fw_write_page(struct i2c_client *client, 590 const void *page) 591 { 592 const u8 ack_ok[] = { 0xaa, 0xaa }; 593 u8 buf[2]; 594 int retry; 595 int error; 596 597 for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) { 598 error = elants_i2c_send(client, page, ELAN_FW_PAGESIZE); 599 if (error) { 600 dev_err(&client->dev, 601 "IAP Write Page failed: %d\n", error); 602 continue; 603 } 604 605 error = elants_i2c_read(client, buf, 2); 606 if (error) { 607 dev_err(&client->dev, 608 "IAP Ack read failed: %d\n", error); 609 return error; 610 } 611 612 if (!memcmp(buf, ack_ok, sizeof(ack_ok))) 613 return 0; 614 615 error = -EIO; 616 dev_err(&client->dev, 617 "IAP Get Ack Error [%02x:%02x]\n", 618 buf[0], buf[1]); 619 } 620 621 return error; 622 } 623 624 static int elants_i2c_validate_remark_id(struct elants_data *ts, 625 const struct firmware *fw) 626 { 627 struct i2c_client *client = ts->client; 628 int error; 629 const u8 cmd[] = { CMD_HEADER_ROM_READ, 0x80, 0x1F, 0x00, 0x00, 0x21 }; 630 u8 resp[6] = { 0 }; 631 u16 ts_remark_id = 0; 632 u16 fw_remark_id = 0; 633 634 /* Compare TS Remark ID and FW Remark ID */ 635 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 636 resp, sizeof(resp)); 637 if (error) { 638 dev_err(&client->dev, "failed to query Remark ID: %d\n", error); 639 return error; 640 } 641 642 ts_remark_id = get_unaligned_be16(&resp[3]); 643 644 fw_remark_id = get_unaligned_le16(&fw->data[fw->size - 4]); 645 646 if (fw_remark_id != ts_remark_id) { 647 dev_err(&client->dev, 648 "Remark ID Mismatched: ts_remark_id=0x%04x, fw_remark_id=0x%04x.\n", 649 ts_remark_id, fw_remark_id); 650 return -EINVAL; 651 } 652 653 return 0; 654 } 655 656 static int elants_i2c_do_update_firmware(struct i2c_client *client, 657 const struct firmware *fw, 658 bool force) 659 { 660 struct elants_data *ts = i2c_get_clientdata(client); 661 const u8 enter_iap[] = { 0x45, 0x49, 0x41, 0x50 }; 662 const u8 enter_iap2[] = { 0x54, 0x00, 0x12, 0x34 }; 663 const u8 iap_ack[] = { 0x55, 0xaa, 0x33, 0xcc }; 664 const u8 close_idle[] = { 0x54, 0x2c, 0x01, 0x01 }; 665 u8 buf[HEADER_SIZE]; 666 u16 send_id; 667 int page, n_fw_pages; 668 int error; 669 bool check_remark_id = ts->iap_version >= 0x60; 670 671 /* Recovery mode detection! */ 672 if (force) { 673 dev_dbg(&client->dev, "Recovery mode procedure\n"); 674 675 if (check_remark_id) { 676 error = elants_i2c_validate_remark_id(ts, fw); 677 if (error) 678 return error; 679 } 680 681 error = elants_i2c_send(client, enter_iap2, sizeof(enter_iap2)); 682 if (error) { 683 dev_err(&client->dev, "failed to enter IAP mode: %d\n", 684 error); 685 return error; 686 } 687 } else { 688 /* Start IAP Procedure */ 689 dev_dbg(&client->dev, "Normal IAP procedure\n"); 690 691 /* Close idle mode */ 692 error = elants_i2c_send(client, close_idle, sizeof(close_idle)); 693 if (error) 694 dev_err(&client->dev, "Failed close idle: %d\n", error); 695 msleep(60); 696 697 elants_i2c_sw_reset(client); 698 msleep(20); 699 700 if (check_remark_id) { 701 error = elants_i2c_validate_remark_id(ts, fw); 702 if (error) 703 return error; 704 } 705 706 error = elants_i2c_send(client, enter_iap, sizeof(enter_iap)); 707 if (error) { 708 dev_err(&client->dev, "failed to enter IAP mode: %d\n", 709 error); 710 return error; 711 } 712 } 713 714 msleep(20); 715 716 /* check IAP state */ 717 error = elants_i2c_read(client, buf, 4); 718 if (error) { 719 dev_err(&client->dev, 720 "failed to read IAP acknowledgement: %d\n", 721 error); 722 return error; 723 } 724 725 if (memcmp(buf, iap_ack, sizeof(iap_ack))) { 726 dev_err(&client->dev, 727 "failed to enter IAP: %*ph (expected %*ph)\n", 728 (int)sizeof(buf), buf, (int)sizeof(iap_ack), iap_ack); 729 return -EIO; 730 } 731 732 dev_info(&client->dev, "successfully entered IAP mode"); 733 734 send_id = client->addr; 735 error = elants_i2c_send(client, &send_id, 1); 736 if (error) { 737 dev_err(&client->dev, "sending dummy byte failed: %d\n", 738 error); 739 return error; 740 } 741 742 /* Clear the last page of Master */ 743 error = elants_i2c_send(client, fw->data, ELAN_FW_PAGESIZE); 744 if (error) { 745 dev_err(&client->dev, "clearing of the last page failed: %d\n", 746 error); 747 return error; 748 } 749 750 error = elants_i2c_read(client, buf, 2); 751 if (error) { 752 dev_err(&client->dev, 753 "failed to read ACK for clearing the last page: %d\n", 754 error); 755 return error; 756 } 757 758 n_fw_pages = fw->size / ELAN_FW_PAGESIZE; 759 dev_dbg(&client->dev, "IAP Pages = %d\n", n_fw_pages); 760 761 for (page = 0; page < n_fw_pages; page++) { 762 error = elants_i2c_fw_write_page(client, 763 fw->data + page * ELAN_FW_PAGESIZE); 764 if (error) { 765 dev_err(&client->dev, 766 "failed to write FW page %d: %d\n", 767 page, error); 768 return error; 769 } 770 } 771 772 /* Old iap needs to wait 200ms for WDT and rest is for hello packets */ 773 msleep(300); 774 775 dev_info(&client->dev, "firmware update completed\n"); 776 return 0; 777 } 778 779 static int elants_i2c_fw_update(struct elants_data *ts) 780 { 781 struct i2c_client *client = ts->client; 782 const struct firmware *fw; 783 char *fw_name; 784 int error; 785 786 fw_name = kasprintf(GFP_KERNEL, "elants_i2c_%04x.bin", ts->hw_version); 787 if (!fw_name) 788 return -ENOMEM; 789 790 dev_info(&client->dev, "requesting fw name = %s\n", fw_name); 791 error = request_firmware(&fw, fw_name, &client->dev); 792 kfree(fw_name); 793 if (error) { 794 dev_err(&client->dev, "failed to request firmware: %d\n", 795 error); 796 return error; 797 } 798 799 if (fw->size % ELAN_FW_PAGESIZE) { 800 dev_err(&client->dev, "invalid firmware length: %zu\n", 801 fw->size); 802 error = -EINVAL; 803 goto out; 804 } 805 806 disable_irq(client->irq); 807 808 error = elants_i2c_do_update_firmware(client, fw, 809 ts->iap_mode == ELAN_IAP_RECOVERY); 810 if (error) { 811 dev_err(&client->dev, "firmware update failed: %d\n", error); 812 ts->iap_mode = ELAN_IAP_RECOVERY; 813 goto out_enable_irq; 814 } 815 816 error = elants_i2c_initialize(ts); 817 if (error) { 818 dev_err(&client->dev, 819 "failed to initialize device after firmware update: %d\n", 820 error); 821 ts->iap_mode = ELAN_IAP_RECOVERY; 822 goto out_enable_irq; 823 } 824 825 ts->iap_mode = ELAN_IAP_OPERATIONAL; 826 827 out_enable_irq: 828 ts->state = ELAN_STATE_NORMAL; 829 enable_irq(client->irq); 830 msleep(100); 831 832 if (!error) 833 elants_i2c_calibrate(ts); 834 out: 835 release_firmware(fw); 836 return error; 837 } 838 839 /* 840 * Event reporting. 841 */ 842 843 static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf) 844 { 845 struct input_dev *input = ts->input; 846 unsigned int n_fingers; 847 unsigned int tool_type; 848 u16 finger_state; 849 int i; 850 851 n_fingers = buf[FW_POS_STATE + 1] & 0x0f; 852 finger_state = ((buf[FW_POS_STATE + 1] & 0x30) << 4) | 853 buf[FW_POS_STATE]; 854 855 dev_dbg(&ts->client->dev, 856 "n_fingers: %u, state: %04x\n", n_fingers, finger_state); 857 858 /* Note: all fingers have the same tool type */ 859 tool_type = buf[FW_POS_TOOL_TYPE] & BIT(0) ? 860 MT_TOOL_FINGER : MT_TOOL_PALM; 861 862 for (i = 0; i < MAX_CONTACT_NUM && n_fingers; i++) { 863 if (finger_state & 1) { 864 unsigned int x, y, p, w; 865 u8 *pos; 866 867 pos = &buf[FW_POS_XY + i * 3]; 868 x = (((u16)pos[0] & 0xf0) << 4) | pos[1]; 869 y = (((u16)pos[0] & 0x0f) << 8) | pos[2]; 870 p = buf[FW_POS_PRESSURE + i]; 871 w = buf[FW_POS_WIDTH + i]; 872 873 dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n", 874 i, x, y, p, w); 875 876 input_mt_slot(input, i); 877 input_mt_report_slot_state(input, tool_type, true); 878 input_event(input, EV_ABS, ABS_MT_POSITION_X, x); 879 input_event(input, EV_ABS, ABS_MT_POSITION_Y, y); 880 input_event(input, EV_ABS, ABS_MT_PRESSURE, p); 881 input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w); 882 883 n_fingers--; 884 } 885 886 finger_state >>= 1; 887 } 888 889 input_mt_sync_frame(input); 890 input_sync(input); 891 } 892 893 static u8 elants_i2c_calculate_checksum(u8 *buf) 894 { 895 u8 checksum = 0; 896 u8 i; 897 898 for (i = 0; i < FW_POS_CHECKSUM; i++) 899 checksum += buf[i]; 900 901 return checksum; 902 } 903 904 static void elants_i2c_event(struct elants_data *ts, u8 *buf) 905 { 906 u8 checksum = elants_i2c_calculate_checksum(buf); 907 908 if (unlikely(buf[FW_POS_CHECKSUM] != checksum)) 909 dev_warn(&ts->client->dev, 910 "%s: invalid checksum for packet %02x: %02x vs. %02x\n", 911 __func__, buf[FW_POS_HEADER], 912 checksum, buf[FW_POS_CHECKSUM]); 913 else if (unlikely(buf[FW_POS_HEADER] != HEADER_REPORT_10_FINGER)) 914 dev_warn(&ts->client->dev, 915 "%s: unknown packet type: %02x\n", 916 __func__, buf[FW_POS_HEADER]); 917 else 918 elants_i2c_mt_event(ts, buf); 919 } 920 921 static irqreturn_t elants_i2c_irq(int irq, void *_dev) 922 { 923 const u8 wait_packet[] = { 0x64, 0x64, 0x64, 0x64 }; 924 struct elants_data *ts = _dev; 925 struct i2c_client *client = ts->client; 926 int report_count, report_len; 927 int i; 928 int len; 929 930 len = i2c_master_recv_dmasafe(client, ts->buf, sizeof(ts->buf)); 931 if (len < 0) { 932 dev_err(&client->dev, "%s: failed to read data: %d\n", 933 __func__, len); 934 goto out; 935 } 936 937 dev_dbg(&client->dev, "%s: packet %*ph\n", 938 __func__, HEADER_SIZE, ts->buf); 939 940 switch (ts->state) { 941 case ELAN_WAIT_RECALIBRATION: 942 if (ts->buf[FW_HDR_TYPE] == CMD_HEADER_REK) { 943 memcpy(ts->cmd_resp, ts->buf, sizeof(ts->cmd_resp)); 944 complete(&ts->cmd_done); 945 ts->state = ELAN_STATE_NORMAL; 946 } 947 break; 948 949 case ELAN_WAIT_QUEUE_HEADER: 950 if (ts->buf[FW_HDR_TYPE] != QUEUE_HEADER_NORMAL) 951 break; 952 953 ts->state = ELAN_STATE_NORMAL; 954 /* fall through */ 955 956 case ELAN_STATE_NORMAL: 957 958 switch (ts->buf[FW_HDR_TYPE]) { 959 case CMD_HEADER_HELLO: 960 case CMD_HEADER_RESP: 961 case CMD_HEADER_REK: 962 break; 963 964 case QUEUE_HEADER_WAIT: 965 if (memcmp(ts->buf, wait_packet, sizeof(wait_packet))) { 966 dev_err(&client->dev, 967 "invalid wait packet %*ph\n", 968 HEADER_SIZE, ts->buf); 969 } else { 970 ts->state = ELAN_WAIT_QUEUE_HEADER; 971 udelay(30); 972 } 973 break; 974 975 case QUEUE_HEADER_SINGLE: 976 elants_i2c_event(ts, &ts->buf[HEADER_SIZE]); 977 break; 978 979 case QUEUE_HEADER_NORMAL: 980 report_count = ts->buf[FW_HDR_COUNT]; 981 if (report_count == 0 || report_count > 3) { 982 dev_err(&client->dev, 983 "bad report count: %*ph\n", 984 HEADER_SIZE, ts->buf); 985 break; 986 } 987 988 report_len = ts->buf[FW_HDR_LENGTH] / report_count; 989 if (report_len != PACKET_SIZE) { 990 dev_err(&client->dev, 991 "mismatching report length: %*ph\n", 992 HEADER_SIZE, ts->buf); 993 break; 994 } 995 996 for (i = 0; i < report_count; i++) { 997 u8 *buf = ts->buf + HEADER_SIZE + 998 i * PACKET_SIZE; 999 elants_i2c_event(ts, buf); 1000 } 1001 break; 1002 1003 default: 1004 dev_err(&client->dev, "unknown packet %*ph\n", 1005 HEADER_SIZE, ts->buf); 1006 break; 1007 } 1008 break; 1009 } 1010 1011 out: 1012 return IRQ_HANDLED; 1013 } 1014 1015 /* 1016 * sysfs interface 1017 */ 1018 static ssize_t calibrate_store(struct device *dev, 1019 struct device_attribute *attr, 1020 const char *buf, size_t count) 1021 { 1022 struct i2c_client *client = to_i2c_client(dev); 1023 struct elants_data *ts = i2c_get_clientdata(client); 1024 int error; 1025 1026 error = mutex_lock_interruptible(&ts->sysfs_mutex); 1027 if (error) 1028 return error; 1029 1030 error = elants_i2c_calibrate(ts); 1031 1032 mutex_unlock(&ts->sysfs_mutex); 1033 return error ?: count; 1034 } 1035 1036 static ssize_t write_update_fw(struct device *dev, 1037 struct device_attribute *attr, 1038 const char *buf, size_t count) 1039 { 1040 struct i2c_client *client = to_i2c_client(dev); 1041 struct elants_data *ts = i2c_get_clientdata(client); 1042 int error; 1043 1044 error = mutex_lock_interruptible(&ts->sysfs_mutex); 1045 if (error) 1046 return error; 1047 1048 error = elants_i2c_fw_update(ts); 1049 dev_dbg(dev, "firmware update result: %d\n", error); 1050 1051 mutex_unlock(&ts->sysfs_mutex); 1052 return error ?: count; 1053 } 1054 1055 static ssize_t show_iap_mode(struct device *dev, 1056 struct device_attribute *attr, char *buf) 1057 { 1058 struct i2c_client *client = to_i2c_client(dev); 1059 struct elants_data *ts = i2c_get_clientdata(client); 1060 1061 return sprintf(buf, "%s\n", 1062 ts->iap_mode == ELAN_IAP_OPERATIONAL ? 1063 "Normal" : "Recovery"); 1064 } 1065 1066 static DEVICE_ATTR_WO(calibrate); 1067 static DEVICE_ATTR(iap_mode, S_IRUGO, show_iap_mode, NULL); 1068 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw); 1069 1070 struct elants_version_attribute { 1071 struct device_attribute dattr; 1072 size_t field_offset; 1073 size_t field_size; 1074 }; 1075 1076 #define __ELANTS_FIELD_SIZE(_field) \ 1077 sizeof(((struct elants_data *)NULL)->_field) 1078 #define __ELANTS_VERIFY_SIZE(_field) \ 1079 (BUILD_BUG_ON_ZERO(__ELANTS_FIELD_SIZE(_field) > 2) + \ 1080 __ELANTS_FIELD_SIZE(_field)) 1081 #define ELANTS_VERSION_ATTR(_field) \ 1082 struct elants_version_attribute elants_ver_attr_##_field = { \ 1083 .dattr = __ATTR(_field, S_IRUGO, \ 1084 elants_version_attribute_show, NULL), \ 1085 .field_offset = offsetof(struct elants_data, _field), \ 1086 .field_size = __ELANTS_VERIFY_SIZE(_field), \ 1087 } 1088 1089 static ssize_t elants_version_attribute_show(struct device *dev, 1090 struct device_attribute *dattr, 1091 char *buf) 1092 { 1093 struct i2c_client *client = to_i2c_client(dev); 1094 struct elants_data *ts = i2c_get_clientdata(client); 1095 struct elants_version_attribute *attr = 1096 container_of(dattr, struct elants_version_attribute, dattr); 1097 u8 *field = (u8 *)((char *)ts + attr->field_offset); 1098 unsigned int fmt_size; 1099 unsigned int val; 1100 1101 if (attr->field_size == 1) { 1102 val = *field; 1103 fmt_size = 2; /* 2 HEX digits */ 1104 } else { 1105 val = *(u16 *)field; 1106 fmt_size = 4; /* 4 HEX digits */ 1107 } 1108 1109 return sprintf(buf, "%0*x\n", fmt_size, val); 1110 } 1111 1112 static ELANTS_VERSION_ATTR(fw_version); 1113 static ELANTS_VERSION_ATTR(hw_version); 1114 static ELANTS_VERSION_ATTR(test_version); 1115 static ELANTS_VERSION_ATTR(solution_version); 1116 static ELANTS_VERSION_ATTR(bc_version); 1117 static ELANTS_VERSION_ATTR(iap_version); 1118 1119 static struct attribute *elants_attributes[] = { 1120 &dev_attr_calibrate.attr, 1121 &dev_attr_update_fw.attr, 1122 &dev_attr_iap_mode.attr, 1123 1124 &elants_ver_attr_fw_version.dattr.attr, 1125 &elants_ver_attr_hw_version.dattr.attr, 1126 &elants_ver_attr_test_version.dattr.attr, 1127 &elants_ver_attr_solution_version.dattr.attr, 1128 &elants_ver_attr_bc_version.dattr.attr, 1129 &elants_ver_attr_iap_version.dattr.attr, 1130 NULL 1131 }; 1132 1133 static const struct attribute_group elants_attribute_group = { 1134 .attrs = elants_attributes, 1135 }; 1136 1137 static int elants_i2c_power_on(struct elants_data *ts) 1138 { 1139 int error; 1140 1141 /* 1142 * If we do not have reset gpio assume platform firmware 1143 * controls regulators and does power them on for us. 1144 */ 1145 if (IS_ERR_OR_NULL(ts->reset_gpio)) 1146 return 0; 1147 1148 gpiod_set_value_cansleep(ts->reset_gpio, 1); 1149 1150 error = regulator_enable(ts->vcc33); 1151 if (error) { 1152 dev_err(&ts->client->dev, 1153 "failed to enable vcc33 regulator: %d\n", 1154 error); 1155 goto release_reset_gpio; 1156 } 1157 1158 error = regulator_enable(ts->vccio); 1159 if (error) { 1160 dev_err(&ts->client->dev, 1161 "failed to enable vccio regulator: %d\n", 1162 error); 1163 regulator_disable(ts->vcc33); 1164 goto release_reset_gpio; 1165 } 1166 1167 /* 1168 * We need to wait a bit after powering on controller before 1169 * we are allowed to release reset GPIO. 1170 */ 1171 udelay(ELAN_POWERON_DELAY_USEC); 1172 1173 release_reset_gpio: 1174 gpiod_set_value_cansleep(ts->reset_gpio, 0); 1175 if (error) 1176 return error; 1177 1178 msleep(ELAN_RESET_DELAY_MSEC); 1179 1180 return 0; 1181 } 1182 1183 static void elants_i2c_power_off(void *_data) 1184 { 1185 struct elants_data *ts = _data; 1186 1187 if (!IS_ERR_OR_NULL(ts->reset_gpio)) { 1188 /* 1189 * Activate reset gpio to prevent leakage through the 1190 * pin once we shut off power to the controller. 1191 */ 1192 gpiod_set_value_cansleep(ts->reset_gpio, 1); 1193 regulator_disable(ts->vccio); 1194 regulator_disable(ts->vcc33); 1195 } 1196 } 1197 1198 static int elants_i2c_probe(struct i2c_client *client, 1199 const struct i2c_device_id *id) 1200 { 1201 union i2c_smbus_data dummy; 1202 struct elants_data *ts; 1203 unsigned long irqflags; 1204 int error; 1205 1206 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { 1207 dev_err(&client->dev, 1208 "%s: i2c check functionality error\n", DEVICE_NAME); 1209 return -ENXIO; 1210 } 1211 1212 ts = devm_kzalloc(&client->dev, sizeof(struct elants_data), GFP_KERNEL); 1213 if (!ts) 1214 return -ENOMEM; 1215 1216 mutex_init(&ts->sysfs_mutex); 1217 init_completion(&ts->cmd_done); 1218 1219 ts->client = client; 1220 i2c_set_clientdata(client, ts); 1221 1222 ts->vcc33 = devm_regulator_get(&client->dev, "vcc33"); 1223 if (IS_ERR(ts->vcc33)) { 1224 error = PTR_ERR(ts->vcc33); 1225 if (error != -EPROBE_DEFER) 1226 dev_err(&client->dev, 1227 "Failed to get 'vcc33' regulator: %d\n", 1228 error); 1229 return error; 1230 } 1231 1232 ts->vccio = devm_regulator_get(&client->dev, "vccio"); 1233 if (IS_ERR(ts->vccio)) { 1234 error = PTR_ERR(ts->vccio); 1235 if (error != -EPROBE_DEFER) 1236 dev_err(&client->dev, 1237 "Failed to get 'vccio' regulator: %d\n", 1238 error); 1239 return error; 1240 } 1241 1242 ts->reset_gpio = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW); 1243 if (IS_ERR(ts->reset_gpio)) { 1244 error = PTR_ERR(ts->reset_gpio); 1245 1246 if (error == -EPROBE_DEFER) 1247 return error; 1248 1249 if (error != -ENOENT && error != -ENOSYS) { 1250 dev_err(&client->dev, 1251 "failed to get reset gpio: %d\n", 1252 error); 1253 return error; 1254 } 1255 1256 ts->keep_power_in_suspend = true; 1257 } 1258 1259 error = elants_i2c_power_on(ts); 1260 if (error) 1261 return error; 1262 1263 error = devm_add_action(&client->dev, elants_i2c_power_off, ts); 1264 if (error) { 1265 dev_err(&client->dev, 1266 "failed to install power off action: %d\n", error); 1267 elants_i2c_power_off(ts); 1268 return error; 1269 } 1270 1271 /* Make sure there is something at this address */ 1272 if (i2c_smbus_xfer(client->adapter, client->addr, 0, 1273 I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) { 1274 dev_err(&client->dev, "nothing at this address\n"); 1275 return -ENXIO; 1276 } 1277 1278 error = elants_i2c_initialize(ts); 1279 if (error) { 1280 dev_err(&client->dev, "failed to initialize: %d\n", error); 1281 return error; 1282 } 1283 1284 ts->input = devm_input_allocate_device(&client->dev); 1285 if (!ts->input) { 1286 dev_err(&client->dev, "Failed to allocate input device\n"); 1287 return -ENOMEM; 1288 } 1289 1290 ts->input->name = "Elan Touchscreen"; 1291 ts->input->id.bustype = BUS_I2C; 1292 1293 __set_bit(BTN_TOUCH, ts->input->keybit); 1294 __set_bit(EV_ABS, ts->input->evbit); 1295 __set_bit(EV_KEY, ts->input->evbit); 1296 1297 /* Single touch input params setup */ 1298 input_set_abs_params(ts->input, ABS_X, 0, ts->x_max, 0, 0); 1299 input_set_abs_params(ts->input, ABS_Y, 0, ts->y_max, 0, 0); 1300 input_set_abs_params(ts->input, ABS_PRESSURE, 0, 255, 0, 0); 1301 input_abs_set_res(ts->input, ABS_X, ts->x_res); 1302 input_abs_set_res(ts->input, ABS_Y, ts->y_res); 1303 1304 /* Multitouch input params setup */ 1305 error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM, 1306 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); 1307 if (error) { 1308 dev_err(&client->dev, 1309 "failed to initialize MT slots: %d\n", error); 1310 return error; 1311 } 1312 1313 input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0); 1314 input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0); 1315 input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); 1316 input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0); 1317 input_set_abs_params(ts->input, ABS_MT_TOOL_TYPE, 1318 0, MT_TOOL_PALM, 0, 0); 1319 input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res); 1320 input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res); 1321 input_abs_set_res(ts->input, ABS_MT_TOUCH_MAJOR, 1); 1322 1323 error = input_register_device(ts->input); 1324 if (error) { 1325 dev_err(&client->dev, 1326 "unable to register input device: %d\n", error); 1327 return error; 1328 } 1329 1330 /* 1331 * Platform code (ACPI, DTS) should normally set up interrupt 1332 * for us, but in case it did not let's fall back to using falling 1333 * edge to be compatible with older Chromebooks. 1334 */ 1335 irqflags = irq_get_trigger_type(client->irq); 1336 if (!irqflags) 1337 irqflags = IRQF_TRIGGER_FALLING; 1338 1339 error = devm_request_threaded_irq(&client->dev, client->irq, 1340 NULL, elants_i2c_irq, 1341 irqflags | IRQF_ONESHOT, 1342 client->name, ts); 1343 if (error) { 1344 dev_err(&client->dev, "Failed to register interrupt\n"); 1345 return error; 1346 } 1347 1348 /* 1349 * Systems using device tree should set up wakeup via DTS, 1350 * the rest will configure device as wakeup source by default. 1351 */ 1352 if (!client->dev.of_node) 1353 device_init_wakeup(&client->dev, true); 1354 1355 error = devm_device_add_group(&client->dev, &elants_attribute_group); 1356 if (error) { 1357 dev_err(&client->dev, "failed to create sysfs attributes: %d\n", 1358 error); 1359 return error; 1360 } 1361 1362 return 0; 1363 } 1364 1365 static int __maybe_unused elants_i2c_suspend(struct device *dev) 1366 { 1367 struct i2c_client *client = to_i2c_client(dev); 1368 struct elants_data *ts = i2c_get_clientdata(client); 1369 const u8 set_sleep_cmd[] = { 0x54, 0x50, 0x00, 0x01 }; 1370 int retry_cnt; 1371 int error; 1372 1373 /* Command not support in IAP recovery mode */ 1374 if (ts->iap_mode != ELAN_IAP_OPERATIONAL) 1375 return -EBUSY; 1376 1377 disable_irq(client->irq); 1378 1379 if (device_may_wakeup(dev)) { 1380 /* 1381 * The device will automatically enter idle mode 1382 * that has reduced power consumption. 1383 */ 1384 ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0); 1385 } else if (ts->keep_power_in_suspend) { 1386 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 1387 error = elants_i2c_send(client, set_sleep_cmd, 1388 sizeof(set_sleep_cmd)); 1389 if (!error) 1390 break; 1391 1392 dev_err(&client->dev, 1393 "suspend command failed: %d\n", error); 1394 } 1395 } else { 1396 elants_i2c_power_off(ts); 1397 } 1398 1399 return 0; 1400 } 1401 1402 static int __maybe_unused elants_i2c_resume(struct device *dev) 1403 { 1404 struct i2c_client *client = to_i2c_client(dev); 1405 struct elants_data *ts = i2c_get_clientdata(client); 1406 const u8 set_active_cmd[] = { 0x54, 0x58, 0x00, 0x01 }; 1407 int retry_cnt; 1408 int error; 1409 1410 if (device_may_wakeup(dev)) { 1411 if (ts->wake_irq_enabled) 1412 disable_irq_wake(client->irq); 1413 elants_i2c_sw_reset(client); 1414 } else if (ts->keep_power_in_suspend) { 1415 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 1416 error = elants_i2c_send(client, set_active_cmd, 1417 sizeof(set_active_cmd)); 1418 if (!error) 1419 break; 1420 1421 dev_err(&client->dev, 1422 "resume command failed: %d\n", error); 1423 } 1424 } else { 1425 elants_i2c_power_on(ts); 1426 elants_i2c_initialize(ts); 1427 } 1428 1429 ts->state = ELAN_STATE_NORMAL; 1430 enable_irq(client->irq); 1431 1432 return 0; 1433 } 1434 1435 static SIMPLE_DEV_PM_OPS(elants_i2c_pm_ops, 1436 elants_i2c_suspend, elants_i2c_resume); 1437 1438 static const struct i2c_device_id elants_i2c_id[] = { 1439 { DEVICE_NAME, 0 }, 1440 { } 1441 }; 1442 MODULE_DEVICE_TABLE(i2c, elants_i2c_id); 1443 1444 #ifdef CONFIG_ACPI 1445 static const struct acpi_device_id elants_acpi_id[] = { 1446 { "ELAN0001", 0 }, 1447 { } 1448 }; 1449 MODULE_DEVICE_TABLE(acpi, elants_acpi_id); 1450 #endif 1451 1452 #ifdef CONFIG_OF 1453 static const struct of_device_id elants_of_match[] = { 1454 { .compatible = "elan,ekth3500" }, 1455 { /* sentinel */ } 1456 }; 1457 MODULE_DEVICE_TABLE(of, elants_of_match); 1458 #endif 1459 1460 static struct i2c_driver elants_i2c_driver = { 1461 .probe = elants_i2c_probe, 1462 .id_table = elants_i2c_id, 1463 .driver = { 1464 .name = DEVICE_NAME, 1465 .pm = &elants_i2c_pm_ops, 1466 .acpi_match_table = ACPI_PTR(elants_acpi_id), 1467 .of_match_table = of_match_ptr(elants_of_match), 1468 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1469 }, 1470 }; 1471 module_i2c_driver(elants_i2c_driver); 1472 1473 MODULE_AUTHOR("Scott Liu <scott.liu@emc.com.tw>"); 1474 MODULE_DESCRIPTION("Elan I2c Touchscreen driver"); 1475 MODULE_LICENSE("GPL"); 1476