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/input/touchscreen.h> 37 #include <linux/acpi.h> 38 #include <linux/of.h> 39 #include <linux/gpio/consumer.h> 40 #include <linux/regulator/consumer.h> 41 #include <asm/unaligned.h> 42 43 /* Device, Driver information */ 44 #define DEVICE_NAME "elants_i2c" 45 46 /* Convert from rows or columns into resolution */ 47 #define ELAN_TS_RESOLUTION(n, m) (((n) - 1) * (m)) 48 49 /* FW header data */ 50 #define HEADER_SIZE 4 51 #define FW_HDR_TYPE 0 52 #define FW_HDR_COUNT 1 53 #define FW_HDR_LENGTH 2 54 55 /* Buffer mode Queue Header information */ 56 #define QUEUE_HEADER_SINGLE 0x62 57 #define QUEUE_HEADER_NORMAL 0X63 58 #define QUEUE_HEADER_WAIT 0x64 59 60 /* Command header definition */ 61 #define CMD_HEADER_WRITE 0x54 62 #define CMD_HEADER_READ 0x53 63 #define CMD_HEADER_6B_READ 0x5B 64 #define CMD_HEADER_ROM_READ 0x96 65 #define CMD_HEADER_RESP 0x52 66 #define CMD_HEADER_6B_RESP 0x9B 67 #define CMD_HEADER_ROM_RESP 0x95 68 #define CMD_HEADER_HELLO 0x55 69 #define CMD_HEADER_REK 0x66 70 71 /* FW position data */ 72 #define PACKET_SIZE 55 73 #define MAX_CONTACT_NUM 10 74 #define FW_POS_HEADER 0 75 #define FW_POS_STATE 1 76 #define FW_POS_TOTAL 2 77 #define FW_POS_XY 3 78 #define FW_POS_TOOL_TYPE 33 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 full 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_REK 0xD0 94 #define E_ELAN_INFO_TEST_VER 0xE0 95 #define E_ELAN_INFO_FW_ID 0xF0 96 #define E_INFO_OSR 0xD6 97 #define E_INFO_PHY_SCAN 0xD7 98 #define E_INFO_PHY_DRIVER 0xD8 99 100 /* FW write command, 0x54 0x?? 0x0, 0x01 */ 101 #define E_POWER_STATE_SLEEP 0x50 102 #define E_POWER_STATE_RESUME 0x58 103 104 #define MAX_RETRIES 3 105 #define MAX_FW_UPDATE_RETRIES 30 106 107 #define ELAN_FW_PAGESIZE 132 108 109 /* calibration timeout definition */ 110 #define ELAN_CALI_TIMEOUT_MSEC 12000 111 112 #define ELAN_POWERON_DELAY_USEC 500 113 #define ELAN_RESET_DELAY_MSEC 20 114 115 enum elants_state { 116 ELAN_STATE_NORMAL, 117 ELAN_WAIT_QUEUE_HEADER, 118 ELAN_WAIT_RECALIBRATION, 119 }; 120 121 enum elants_iap_mode { 122 ELAN_IAP_OPERATIONAL, 123 ELAN_IAP_RECOVERY, 124 }; 125 126 /* struct elants_data - represents state of Elan touchscreen device */ 127 struct elants_data { 128 struct i2c_client *client; 129 struct input_dev *input; 130 131 struct regulator *vcc33; 132 struct regulator *vccio; 133 struct gpio_desc *reset_gpio; 134 135 u16 fw_version; 136 u8 test_version; 137 u8 solution_version; 138 u8 bc_version; 139 u8 iap_version; 140 u16 hw_version; 141 u8 major_res; 142 unsigned int x_res; /* resolution in units/mm */ 143 unsigned int y_res; 144 unsigned int x_max; 145 unsigned int y_max; 146 struct touchscreen_properties prop; 147 148 enum elants_state state; 149 enum elants_iap_mode iap_mode; 150 151 /* Guards against concurrent access to the device via sysfs */ 152 struct mutex sysfs_mutex; 153 154 u8 cmd_resp[HEADER_SIZE]; 155 struct completion cmd_done; 156 157 bool wake_irq_enabled; 158 bool keep_power_in_suspend; 159 160 /* Must be last to be used for DMA operations */ 161 u8 buf[MAX_PACKET_SIZE] ____cacheline_aligned; 162 }; 163 164 static int elants_i2c_send(struct i2c_client *client, 165 const void *data, size_t size) 166 { 167 int ret; 168 169 ret = i2c_master_send(client, data, size); 170 if (ret == size) 171 return 0; 172 173 if (ret >= 0) 174 ret = -EIO; 175 176 dev_err(&client->dev, "%s failed (%*ph): %d\n", 177 __func__, (int)size, data, ret); 178 179 return ret; 180 } 181 182 static int elants_i2c_read(struct i2c_client *client, void *data, size_t size) 183 { 184 int ret; 185 186 ret = i2c_master_recv(client, data, size); 187 if (ret == size) 188 return 0; 189 190 if (ret >= 0) 191 ret = -EIO; 192 193 dev_err(&client->dev, "%s failed: %d\n", __func__, ret); 194 195 return ret; 196 } 197 198 static int elants_i2c_execute_command(struct i2c_client *client, 199 const u8 *cmd, size_t cmd_size, 200 u8 *resp, size_t resp_size, 201 int retries, const char *cmd_name) 202 { 203 struct i2c_msg msgs[2]; 204 int ret; 205 u8 expected_response; 206 207 switch (cmd[0]) { 208 case CMD_HEADER_READ: 209 expected_response = CMD_HEADER_RESP; 210 break; 211 212 case CMD_HEADER_6B_READ: 213 expected_response = CMD_HEADER_6B_RESP; 214 break; 215 216 case CMD_HEADER_ROM_READ: 217 expected_response = CMD_HEADER_ROM_RESP; 218 break; 219 220 default: 221 dev_err(&client->dev, "(%s): invalid command: %*ph\n", 222 cmd_name, (int)cmd_size, cmd); 223 return -EINVAL; 224 } 225 226 for (;;) { 227 msgs[0].addr = client->addr; 228 msgs[0].flags = client->flags & I2C_M_TEN; 229 msgs[0].len = cmd_size; 230 msgs[0].buf = (u8 *)cmd; 231 232 msgs[1].addr = client->addr; 233 msgs[1].flags = (client->flags & I2C_M_TEN) | I2C_M_RD; 234 msgs[1].flags |= I2C_M_RD; 235 msgs[1].len = resp_size; 236 msgs[1].buf = resp; 237 238 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 239 if (ret < 0) { 240 if (--retries > 0) { 241 dev_dbg(&client->dev, 242 "(%s) I2C transfer failed: %pe (retrying)\n", 243 cmd_name, ERR_PTR(ret)); 244 continue; 245 } 246 247 dev_err(&client->dev, 248 "(%s) I2C transfer failed: %pe\n", 249 cmd_name, ERR_PTR(ret)); 250 return ret; 251 } 252 253 if (ret != ARRAY_SIZE(msgs) || 254 resp[FW_HDR_TYPE] != expected_response) { 255 if (--retries > 0) { 256 dev_dbg(&client->dev, 257 "(%s) unexpected response: %*ph (retrying)\n", 258 cmd_name, ret, resp); 259 continue; 260 } 261 262 dev_err(&client->dev, 263 "(%s) unexpected response: %*ph\n", 264 cmd_name, ret, resp); 265 return -EIO; 266 } 267 268 return 0; 269 } 270 } 271 272 static int elants_i2c_calibrate(struct elants_data *ts) 273 { 274 struct i2c_client *client = ts->client; 275 int ret, error; 276 static const u8 w_flashkey[] = { CMD_HEADER_WRITE, 0xC0, 0xE1, 0x5A }; 277 static const u8 rek[] = { CMD_HEADER_WRITE, 0x29, 0x00, 0x01 }; 278 static const u8 rek_resp[] = { CMD_HEADER_REK, 0x66, 0x66, 0x66 }; 279 280 disable_irq(client->irq); 281 282 ts->state = ELAN_WAIT_RECALIBRATION; 283 reinit_completion(&ts->cmd_done); 284 285 elants_i2c_send(client, w_flashkey, sizeof(w_flashkey)); 286 elants_i2c_send(client, rek, sizeof(rek)); 287 288 enable_irq(client->irq); 289 290 ret = wait_for_completion_interruptible_timeout(&ts->cmd_done, 291 msecs_to_jiffies(ELAN_CALI_TIMEOUT_MSEC)); 292 293 ts->state = ELAN_STATE_NORMAL; 294 295 if (ret <= 0) { 296 error = ret < 0 ? ret : -ETIMEDOUT; 297 dev_err(&client->dev, 298 "error while waiting for calibration to complete: %d\n", 299 error); 300 return error; 301 } 302 303 if (memcmp(rek_resp, ts->cmd_resp, sizeof(rek_resp))) { 304 dev_err(&client->dev, 305 "unexpected calibration response: %*ph\n", 306 (int)sizeof(ts->cmd_resp), ts->cmd_resp); 307 return -EINVAL; 308 } 309 310 return 0; 311 } 312 313 static int elants_i2c_sw_reset(struct i2c_client *client) 314 { 315 const u8 soft_rst_cmd[] = { 0x77, 0x77, 0x77, 0x77 }; 316 int error; 317 318 error = elants_i2c_send(client, soft_rst_cmd, 319 sizeof(soft_rst_cmd)); 320 if (error) { 321 dev_err(&client->dev, "software reset failed: %d\n", error); 322 return error; 323 } 324 325 /* 326 * We should wait at least 10 msec (but no more than 40) before 327 * sending fastboot or IAP command to the device. 328 */ 329 msleep(30); 330 331 return 0; 332 } 333 334 static u16 elants_i2c_parse_version(u8 *buf) 335 { 336 return get_unaligned_be32(buf) >> 4; 337 } 338 339 static int elants_i2c_query_hw_version(struct elants_data *ts) 340 { 341 struct i2c_client *client = ts->client; 342 int retry_cnt = MAX_RETRIES; 343 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 }; 344 u8 resp[HEADER_SIZE]; 345 int error; 346 347 while (retry_cnt--) { 348 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 349 resp, sizeof(resp), 1, 350 "read fw id"); 351 if (error) 352 return error; 353 354 ts->hw_version = elants_i2c_parse_version(resp); 355 if (ts->hw_version != 0xffff) 356 return 0; 357 } 358 359 dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version); 360 361 return -EINVAL; 362 } 363 364 static int elants_i2c_query_fw_version(struct elants_data *ts) 365 { 366 struct i2c_client *client = ts->client; 367 int retry_cnt = MAX_RETRIES; 368 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 }; 369 u8 resp[HEADER_SIZE]; 370 int error; 371 372 while (retry_cnt--) { 373 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 374 resp, sizeof(resp), 1, 375 "read fw version"); 376 if (error) 377 return error; 378 379 ts->fw_version = elants_i2c_parse_version(resp); 380 if (ts->fw_version != 0x0000 && ts->fw_version != 0xffff) 381 return 0; 382 383 dev_dbg(&client->dev, "(read fw version) resp %*phC\n", 384 (int)sizeof(resp), resp); 385 } 386 387 dev_err(&client->dev, "Invalid fw ver: %#04x\n", ts->fw_version); 388 389 return -EINVAL; 390 } 391 392 static int elants_i2c_query_test_version(struct elants_data *ts) 393 { 394 struct i2c_client *client = ts->client; 395 int error; 396 u16 version; 397 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 }; 398 u8 resp[HEADER_SIZE]; 399 400 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 401 resp, sizeof(resp), MAX_RETRIES, 402 "read test version"); 403 if (error) { 404 dev_err(&client->dev, "Failed to read test version\n"); 405 return error; 406 } 407 408 version = elants_i2c_parse_version(resp); 409 ts->test_version = version >> 8; 410 ts->solution_version = version & 0xff; 411 412 return 0; 413 } 414 415 static int elants_i2c_query_bc_version(struct elants_data *ts) 416 { 417 struct i2c_client *client = ts->client; 418 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_BC_VER, 0x00, 0x01 }; 419 u8 resp[HEADER_SIZE]; 420 u16 version; 421 int error; 422 423 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 424 resp, sizeof(resp), 1, 425 "read BC version"); 426 if (error) 427 return error; 428 429 version = elants_i2c_parse_version(resp); 430 ts->bc_version = version >> 8; 431 ts->iap_version = version & 0xff; 432 433 return 0; 434 } 435 436 static int elants_i2c_query_ts_info(struct elants_data *ts) 437 { 438 struct i2c_client *client = ts->client; 439 int error; 440 u8 resp[17]; 441 u16 phy_x, phy_y, rows, cols, osr; 442 const u8 get_resolution_cmd[] = { 443 CMD_HEADER_6B_READ, 0x00, 0x00, 0x00, 0x00, 0x00 444 }; 445 const u8 get_osr_cmd[] = { 446 CMD_HEADER_READ, E_INFO_OSR, 0x00, 0x01 447 }; 448 const u8 get_physical_scan_cmd[] = { 449 CMD_HEADER_READ, E_INFO_PHY_SCAN, 0x00, 0x01 450 }; 451 const u8 get_physical_drive_cmd[] = { 452 CMD_HEADER_READ, E_INFO_PHY_DRIVER, 0x00, 0x01 453 }; 454 455 /* Get trace number */ 456 error = elants_i2c_execute_command(client, 457 get_resolution_cmd, 458 sizeof(get_resolution_cmd), 459 resp, sizeof(resp), 1, 460 "get resolution"); 461 if (error) 462 return error; 463 464 rows = resp[2] + resp[6] + resp[10]; 465 cols = resp[3] + resp[7] + resp[11]; 466 467 /* Get report resolution value of ABS_MT_TOUCH_MAJOR */ 468 ts->major_res = resp[16]; 469 470 /* Process mm_to_pixel information */ 471 error = elants_i2c_execute_command(client, 472 get_osr_cmd, sizeof(get_osr_cmd), 473 resp, sizeof(resp), 1, "get osr"); 474 if (error) 475 return error; 476 477 osr = resp[3]; 478 479 error = elants_i2c_execute_command(client, 480 get_physical_scan_cmd, 481 sizeof(get_physical_scan_cmd), 482 resp, sizeof(resp), 1, 483 "get physical scan"); 484 if (error) 485 return error; 486 487 phy_x = get_unaligned_be16(&resp[2]); 488 489 error = elants_i2c_execute_command(client, 490 get_physical_drive_cmd, 491 sizeof(get_physical_drive_cmd), 492 resp, sizeof(resp), 1, 493 "get physical drive"); 494 if (error) 495 return error; 496 497 phy_y = get_unaligned_be16(&resp[2]); 498 499 dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y); 500 501 if (rows == 0 || cols == 0 || osr == 0) { 502 dev_warn(&client->dev, 503 "invalid trace number data: %d, %d, %d\n", 504 rows, cols, osr); 505 } else { 506 /* translate trace number to TS resolution */ 507 ts->x_max = ELAN_TS_RESOLUTION(rows, osr); 508 ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x); 509 ts->y_max = ELAN_TS_RESOLUTION(cols, osr); 510 ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y); 511 } 512 513 return 0; 514 } 515 516 static int elants_i2c_fastboot(struct i2c_client *client) 517 { 518 const u8 boot_cmd[] = { 0x4D, 0x61, 0x69, 0x6E }; 519 int error; 520 521 error = elants_i2c_send(client, boot_cmd, sizeof(boot_cmd)); 522 if (error) { 523 dev_err(&client->dev, "boot failed: %d\n", error); 524 return error; 525 } 526 527 dev_dbg(&client->dev, "boot success -- 0x%x\n", client->addr); 528 return 0; 529 } 530 531 static int elants_i2c_initialize(struct elants_data *ts) 532 { 533 struct i2c_client *client = ts->client; 534 int error, error2, retry_cnt; 535 const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 }; 536 const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 }; 537 u8 buf[HEADER_SIZE]; 538 539 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 540 error = elants_i2c_sw_reset(client); 541 if (error) { 542 /* Continue initializing if it's the last try */ 543 if (retry_cnt < MAX_RETRIES - 1) 544 continue; 545 } 546 547 error = elants_i2c_fastboot(client); 548 if (error) { 549 /* Continue initializing if it's the last try */ 550 if (retry_cnt < MAX_RETRIES - 1) 551 continue; 552 } 553 554 /* Wait for Hello packet */ 555 msleep(BOOT_TIME_DELAY_MS); 556 557 error = elants_i2c_read(client, buf, sizeof(buf)); 558 if (error) { 559 dev_err(&client->dev, 560 "failed to read 'hello' packet: %d\n", error); 561 } else if (!memcmp(buf, hello_packet, sizeof(hello_packet))) { 562 ts->iap_mode = ELAN_IAP_OPERATIONAL; 563 break; 564 } else if (!memcmp(buf, recov_packet, sizeof(recov_packet))) { 565 /* 566 * Setting error code will mark device 567 * in recovery mode below. 568 */ 569 error = -EIO; 570 break; 571 } else { 572 error = -EINVAL; 573 dev_err(&client->dev, 574 "invalid 'hello' packet: %*ph\n", 575 (int)sizeof(buf), buf); 576 } 577 } 578 579 /* hw version is available even if device in recovery state */ 580 error2 = elants_i2c_query_hw_version(ts); 581 if (!error2) 582 error2 = elants_i2c_query_bc_version(ts); 583 if (!error) 584 error = error2; 585 586 if (!error) 587 error = elants_i2c_query_fw_version(ts); 588 if (!error) 589 error = elants_i2c_query_test_version(ts); 590 if (!error) 591 error = elants_i2c_query_ts_info(ts); 592 593 if (error) 594 ts->iap_mode = ELAN_IAP_RECOVERY; 595 596 return 0; 597 } 598 599 /* 600 * Firmware update interface. 601 */ 602 603 static int elants_i2c_fw_write_page(struct i2c_client *client, 604 const void *page) 605 { 606 const u8 ack_ok[] = { 0xaa, 0xaa }; 607 u8 buf[2]; 608 int retry; 609 int error; 610 611 for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) { 612 error = elants_i2c_send(client, page, ELAN_FW_PAGESIZE); 613 if (error) { 614 dev_err(&client->dev, 615 "IAP Write Page failed: %d\n", error); 616 continue; 617 } 618 619 error = elants_i2c_read(client, buf, 2); 620 if (error) { 621 dev_err(&client->dev, 622 "IAP Ack read failed: %d\n", error); 623 return error; 624 } 625 626 if (!memcmp(buf, ack_ok, sizeof(ack_ok))) 627 return 0; 628 629 error = -EIO; 630 dev_err(&client->dev, 631 "IAP Get Ack Error [%02x:%02x]\n", 632 buf[0], buf[1]); 633 } 634 635 return error; 636 } 637 638 static int elants_i2c_validate_remark_id(struct elants_data *ts, 639 const struct firmware *fw) 640 { 641 struct i2c_client *client = ts->client; 642 int error; 643 const u8 cmd[] = { CMD_HEADER_ROM_READ, 0x80, 0x1F, 0x00, 0x00, 0x21 }; 644 u8 resp[6] = { 0 }; 645 u16 ts_remark_id = 0; 646 u16 fw_remark_id = 0; 647 648 /* Compare TS Remark ID and FW Remark ID */ 649 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 650 resp, sizeof(resp), 651 1, "read Remark ID"); 652 if (error) 653 return error; 654 655 ts_remark_id = get_unaligned_be16(&resp[3]); 656 657 fw_remark_id = get_unaligned_le16(&fw->data[fw->size - 4]); 658 659 if (fw_remark_id != ts_remark_id) { 660 dev_err(&client->dev, 661 "Remark ID Mismatched: ts_remark_id=0x%04x, fw_remark_id=0x%04x.\n", 662 ts_remark_id, fw_remark_id); 663 return -EINVAL; 664 } 665 666 return 0; 667 } 668 669 static int elants_i2c_do_update_firmware(struct i2c_client *client, 670 const struct firmware *fw, 671 bool force) 672 { 673 struct elants_data *ts = i2c_get_clientdata(client); 674 const u8 enter_iap[] = { 0x45, 0x49, 0x41, 0x50 }; 675 const u8 enter_iap2[] = { 0x54, 0x00, 0x12, 0x34 }; 676 const u8 iap_ack[] = { 0x55, 0xaa, 0x33, 0xcc }; 677 const u8 close_idle[] = { 0x54, 0x2c, 0x01, 0x01 }; 678 u8 buf[HEADER_SIZE]; 679 u16 send_id; 680 int page, n_fw_pages; 681 int error; 682 bool check_remark_id = ts->iap_version >= 0x60; 683 684 /* Recovery mode detection! */ 685 if (force) { 686 dev_dbg(&client->dev, "Recovery mode procedure\n"); 687 688 if (check_remark_id) { 689 error = elants_i2c_validate_remark_id(ts, fw); 690 if (error) 691 return error; 692 } 693 694 error = elants_i2c_send(client, enter_iap2, sizeof(enter_iap2)); 695 if (error) { 696 dev_err(&client->dev, "failed to enter IAP mode: %d\n", 697 error); 698 return error; 699 } 700 } else { 701 /* Start IAP Procedure */ 702 dev_dbg(&client->dev, "Normal IAP procedure\n"); 703 704 /* Close idle mode */ 705 error = elants_i2c_send(client, close_idle, sizeof(close_idle)); 706 if (error) 707 dev_err(&client->dev, "Failed close idle: %d\n", error); 708 msleep(60); 709 710 elants_i2c_sw_reset(client); 711 msleep(20); 712 713 if (check_remark_id) { 714 error = elants_i2c_validate_remark_id(ts, fw); 715 if (error) 716 return error; 717 } 718 719 error = elants_i2c_send(client, enter_iap, sizeof(enter_iap)); 720 if (error) { 721 dev_err(&client->dev, "failed to enter IAP mode: %d\n", 722 error); 723 return error; 724 } 725 } 726 727 msleep(20); 728 729 /* check IAP state */ 730 error = elants_i2c_read(client, buf, 4); 731 if (error) { 732 dev_err(&client->dev, 733 "failed to read IAP acknowledgement: %d\n", 734 error); 735 return error; 736 } 737 738 if (memcmp(buf, iap_ack, sizeof(iap_ack))) { 739 dev_err(&client->dev, 740 "failed to enter IAP: %*ph (expected %*ph)\n", 741 (int)sizeof(buf), buf, (int)sizeof(iap_ack), iap_ack); 742 return -EIO; 743 } 744 745 dev_info(&client->dev, "successfully entered IAP mode"); 746 747 send_id = client->addr; 748 error = elants_i2c_send(client, &send_id, 1); 749 if (error) { 750 dev_err(&client->dev, "sending dummy byte failed: %d\n", 751 error); 752 return error; 753 } 754 755 /* Clear the last page of Master */ 756 error = elants_i2c_send(client, fw->data, ELAN_FW_PAGESIZE); 757 if (error) { 758 dev_err(&client->dev, "clearing of the last page failed: %d\n", 759 error); 760 return error; 761 } 762 763 error = elants_i2c_read(client, buf, 2); 764 if (error) { 765 dev_err(&client->dev, 766 "failed to read ACK for clearing the last page: %d\n", 767 error); 768 return error; 769 } 770 771 n_fw_pages = fw->size / ELAN_FW_PAGESIZE; 772 dev_dbg(&client->dev, "IAP Pages = %d\n", n_fw_pages); 773 774 for (page = 0; page < n_fw_pages; page++) { 775 error = elants_i2c_fw_write_page(client, 776 fw->data + page * ELAN_FW_PAGESIZE); 777 if (error) { 778 dev_err(&client->dev, 779 "failed to write FW page %d: %d\n", 780 page, error); 781 return error; 782 } 783 } 784 785 /* Old iap needs to wait 200ms for WDT and rest is for hello packets */ 786 msleep(300); 787 788 dev_info(&client->dev, "firmware update completed\n"); 789 return 0; 790 } 791 792 static int elants_i2c_fw_update(struct elants_data *ts) 793 { 794 struct i2c_client *client = ts->client; 795 const struct firmware *fw; 796 char *fw_name; 797 int error; 798 799 fw_name = kasprintf(GFP_KERNEL, "elants_i2c_%04x.bin", ts->hw_version); 800 if (!fw_name) 801 return -ENOMEM; 802 803 dev_info(&client->dev, "requesting fw name = %s\n", fw_name); 804 error = request_firmware(&fw, fw_name, &client->dev); 805 kfree(fw_name); 806 if (error) { 807 dev_err(&client->dev, "failed to request firmware: %d\n", 808 error); 809 return error; 810 } 811 812 if (fw->size % ELAN_FW_PAGESIZE) { 813 dev_err(&client->dev, "invalid firmware length: %zu\n", 814 fw->size); 815 error = -EINVAL; 816 goto out; 817 } 818 819 disable_irq(client->irq); 820 821 error = elants_i2c_do_update_firmware(client, fw, 822 ts->iap_mode == ELAN_IAP_RECOVERY); 823 if (error) { 824 dev_err(&client->dev, "firmware update failed: %d\n", error); 825 ts->iap_mode = ELAN_IAP_RECOVERY; 826 goto out_enable_irq; 827 } 828 829 error = elants_i2c_initialize(ts); 830 if (error) { 831 dev_err(&client->dev, 832 "failed to initialize device after firmware update: %d\n", 833 error); 834 ts->iap_mode = ELAN_IAP_RECOVERY; 835 goto out_enable_irq; 836 } 837 838 ts->iap_mode = ELAN_IAP_OPERATIONAL; 839 840 out_enable_irq: 841 ts->state = ELAN_STATE_NORMAL; 842 enable_irq(client->irq); 843 msleep(100); 844 845 if (!error) 846 elants_i2c_calibrate(ts); 847 out: 848 release_firmware(fw); 849 return error; 850 } 851 852 /* 853 * Event reporting. 854 */ 855 856 static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf) 857 { 858 struct input_dev *input = ts->input; 859 unsigned int n_fingers; 860 unsigned int tool_type; 861 u16 finger_state; 862 int i; 863 864 n_fingers = buf[FW_POS_STATE + 1] & 0x0f; 865 finger_state = ((buf[FW_POS_STATE + 1] & 0x30) << 4) | 866 buf[FW_POS_STATE]; 867 868 dev_dbg(&ts->client->dev, 869 "n_fingers: %u, state: %04x\n", n_fingers, finger_state); 870 871 /* Note: all fingers have the same tool type */ 872 tool_type = buf[FW_POS_TOOL_TYPE] & BIT(0) ? 873 MT_TOOL_FINGER : MT_TOOL_PALM; 874 875 for (i = 0; i < MAX_CONTACT_NUM && n_fingers; i++) { 876 if (finger_state & 1) { 877 unsigned int x, y, p, w; 878 u8 *pos; 879 880 pos = &buf[FW_POS_XY + i * 3]; 881 x = (((u16)pos[0] & 0xf0) << 4) | pos[1]; 882 y = (((u16)pos[0] & 0x0f) << 8) | pos[2]; 883 p = buf[FW_POS_PRESSURE + i]; 884 w = buf[FW_POS_WIDTH + i]; 885 886 dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n", 887 i, x, y, p, w); 888 889 input_mt_slot(input, i); 890 input_mt_report_slot_state(input, tool_type, true); 891 touchscreen_report_pos(input, &ts->prop, x, y, true); 892 input_event(input, EV_ABS, ABS_MT_PRESSURE, p); 893 input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w); 894 895 n_fingers--; 896 } 897 898 finger_state >>= 1; 899 } 900 901 input_mt_sync_frame(input); 902 input_sync(input); 903 } 904 905 static u8 elants_i2c_calculate_checksum(u8 *buf) 906 { 907 u8 checksum = 0; 908 u8 i; 909 910 for (i = 0; i < FW_POS_CHECKSUM; i++) 911 checksum += buf[i]; 912 913 return checksum; 914 } 915 916 static void elants_i2c_event(struct elants_data *ts, u8 *buf) 917 { 918 u8 checksum = elants_i2c_calculate_checksum(buf); 919 920 if (unlikely(buf[FW_POS_CHECKSUM] != checksum)) 921 dev_warn(&ts->client->dev, 922 "%s: invalid checksum for packet %02x: %02x vs. %02x\n", 923 __func__, buf[FW_POS_HEADER], 924 checksum, buf[FW_POS_CHECKSUM]); 925 else if (unlikely(buf[FW_POS_HEADER] != HEADER_REPORT_10_FINGER)) 926 dev_warn(&ts->client->dev, 927 "%s: unknown packet type: %02x\n", 928 __func__, buf[FW_POS_HEADER]); 929 else 930 elants_i2c_mt_event(ts, buf); 931 } 932 933 static irqreturn_t elants_i2c_irq(int irq, void *_dev) 934 { 935 const u8 wait_packet[] = { 0x64, 0x64, 0x64, 0x64 }; 936 struct elants_data *ts = _dev; 937 struct i2c_client *client = ts->client; 938 int report_count, report_len; 939 int i; 940 int len; 941 942 len = i2c_master_recv_dmasafe(client, ts->buf, sizeof(ts->buf)); 943 if (len < 0) { 944 dev_err(&client->dev, "%s: failed to read data: %d\n", 945 __func__, len); 946 goto out; 947 } 948 949 dev_dbg(&client->dev, "%s: packet %*ph\n", 950 __func__, HEADER_SIZE, ts->buf); 951 952 switch (ts->state) { 953 case ELAN_WAIT_RECALIBRATION: 954 if (ts->buf[FW_HDR_TYPE] == CMD_HEADER_REK) { 955 memcpy(ts->cmd_resp, ts->buf, sizeof(ts->cmd_resp)); 956 complete(&ts->cmd_done); 957 ts->state = ELAN_STATE_NORMAL; 958 } 959 break; 960 961 case ELAN_WAIT_QUEUE_HEADER: 962 if (ts->buf[FW_HDR_TYPE] != QUEUE_HEADER_NORMAL) 963 break; 964 965 ts->state = ELAN_STATE_NORMAL; 966 fallthrough; 967 968 case ELAN_STATE_NORMAL: 969 970 switch (ts->buf[FW_HDR_TYPE]) { 971 case CMD_HEADER_HELLO: 972 case CMD_HEADER_RESP: 973 case CMD_HEADER_REK: 974 break; 975 976 case QUEUE_HEADER_WAIT: 977 if (memcmp(ts->buf, wait_packet, sizeof(wait_packet))) { 978 dev_err(&client->dev, 979 "invalid wait packet %*ph\n", 980 HEADER_SIZE, ts->buf); 981 } else { 982 ts->state = ELAN_WAIT_QUEUE_HEADER; 983 udelay(30); 984 } 985 break; 986 987 case QUEUE_HEADER_SINGLE: 988 elants_i2c_event(ts, &ts->buf[HEADER_SIZE]); 989 break; 990 991 case QUEUE_HEADER_NORMAL: 992 report_count = ts->buf[FW_HDR_COUNT]; 993 if (report_count == 0 || report_count > 3) { 994 dev_err(&client->dev, 995 "bad report count: %*ph\n", 996 HEADER_SIZE, ts->buf); 997 break; 998 } 999 1000 report_len = ts->buf[FW_HDR_LENGTH] / report_count; 1001 if (report_len != PACKET_SIZE) { 1002 dev_err(&client->dev, 1003 "mismatching report length: %*ph\n", 1004 HEADER_SIZE, ts->buf); 1005 break; 1006 } 1007 1008 for (i = 0; i < report_count; i++) { 1009 u8 *buf = ts->buf + HEADER_SIZE + 1010 i * PACKET_SIZE; 1011 elants_i2c_event(ts, buf); 1012 } 1013 break; 1014 1015 default: 1016 dev_err(&client->dev, "unknown packet %*ph\n", 1017 HEADER_SIZE, ts->buf); 1018 break; 1019 } 1020 break; 1021 } 1022 1023 out: 1024 return IRQ_HANDLED; 1025 } 1026 1027 /* 1028 * sysfs interface 1029 */ 1030 static ssize_t calibrate_store(struct device *dev, 1031 struct device_attribute *attr, 1032 const char *buf, size_t count) 1033 { 1034 struct i2c_client *client = to_i2c_client(dev); 1035 struct elants_data *ts = i2c_get_clientdata(client); 1036 int error; 1037 1038 error = mutex_lock_interruptible(&ts->sysfs_mutex); 1039 if (error) 1040 return error; 1041 1042 error = elants_i2c_calibrate(ts); 1043 1044 mutex_unlock(&ts->sysfs_mutex); 1045 return error ?: count; 1046 } 1047 1048 static ssize_t write_update_fw(struct device *dev, 1049 struct device_attribute *attr, 1050 const char *buf, size_t count) 1051 { 1052 struct i2c_client *client = to_i2c_client(dev); 1053 struct elants_data *ts = i2c_get_clientdata(client); 1054 int error; 1055 1056 error = mutex_lock_interruptible(&ts->sysfs_mutex); 1057 if (error) 1058 return error; 1059 1060 error = elants_i2c_fw_update(ts); 1061 dev_dbg(dev, "firmware update result: %d\n", error); 1062 1063 mutex_unlock(&ts->sysfs_mutex); 1064 return error ?: count; 1065 } 1066 1067 static ssize_t show_iap_mode(struct device *dev, 1068 struct device_attribute *attr, char *buf) 1069 { 1070 struct i2c_client *client = to_i2c_client(dev); 1071 struct elants_data *ts = i2c_get_clientdata(client); 1072 1073 return sprintf(buf, "%s\n", 1074 ts->iap_mode == ELAN_IAP_OPERATIONAL ? 1075 "Normal" : "Recovery"); 1076 } 1077 1078 static ssize_t show_calibration_count(struct device *dev, 1079 struct device_attribute *attr, char *buf) 1080 { 1081 struct i2c_client *client = to_i2c_client(dev); 1082 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_REK, 0x00, 0x01 }; 1083 u8 resp[HEADER_SIZE]; 1084 u16 rek_count; 1085 int error; 1086 1087 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 1088 resp, sizeof(resp), 1, 1089 "read ReK status"); 1090 if (error) 1091 return sprintf(buf, "%d\n", error); 1092 1093 rek_count = get_unaligned_be16(&resp[2]); 1094 return sprintf(buf, "0x%04x\n", rek_count); 1095 } 1096 1097 static DEVICE_ATTR_WO(calibrate); 1098 static DEVICE_ATTR(iap_mode, S_IRUGO, show_iap_mode, NULL); 1099 static DEVICE_ATTR(calibration_count, S_IRUGO, show_calibration_count, NULL); 1100 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw); 1101 1102 struct elants_version_attribute { 1103 struct device_attribute dattr; 1104 size_t field_offset; 1105 size_t field_size; 1106 }; 1107 1108 #define __ELANTS_FIELD_SIZE(_field) \ 1109 sizeof(((struct elants_data *)NULL)->_field) 1110 #define __ELANTS_VERIFY_SIZE(_field) \ 1111 (BUILD_BUG_ON_ZERO(__ELANTS_FIELD_SIZE(_field) > 2) + \ 1112 __ELANTS_FIELD_SIZE(_field)) 1113 #define ELANTS_VERSION_ATTR(_field) \ 1114 struct elants_version_attribute elants_ver_attr_##_field = { \ 1115 .dattr = __ATTR(_field, S_IRUGO, \ 1116 elants_version_attribute_show, NULL), \ 1117 .field_offset = offsetof(struct elants_data, _field), \ 1118 .field_size = __ELANTS_VERIFY_SIZE(_field), \ 1119 } 1120 1121 static ssize_t elants_version_attribute_show(struct device *dev, 1122 struct device_attribute *dattr, 1123 char *buf) 1124 { 1125 struct i2c_client *client = to_i2c_client(dev); 1126 struct elants_data *ts = i2c_get_clientdata(client); 1127 struct elants_version_attribute *attr = 1128 container_of(dattr, struct elants_version_attribute, dattr); 1129 u8 *field = (u8 *)((char *)ts + attr->field_offset); 1130 unsigned int fmt_size; 1131 unsigned int val; 1132 1133 if (attr->field_size == 1) { 1134 val = *field; 1135 fmt_size = 2; /* 2 HEX digits */ 1136 } else { 1137 val = *(u16 *)field; 1138 fmt_size = 4; /* 4 HEX digits */ 1139 } 1140 1141 return sprintf(buf, "%0*x\n", fmt_size, val); 1142 } 1143 1144 static ELANTS_VERSION_ATTR(fw_version); 1145 static ELANTS_VERSION_ATTR(hw_version); 1146 static ELANTS_VERSION_ATTR(test_version); 1147 static ELANTS_VERSION_ATTR(solution_version); 1148 static ELANTS_VERSION_ATTR(bc_version); 1149 static ELANTS_VERSION_ATTR(iap_version); 1150 1151 static struct attribute *elants_attributes[] = { 1152 &dev_attr_calibrate.attr, 1153 &dev_attr_update_fw.attr, 1154 &dev_attr_iap_mode.attr, 1155 &dev_attr_calibration_count.attr, 1156 1157 &elants_ver_attr_fw_version.dattr.attr, 1158 &elants_ver_attr_hw_version.dattr.attr, 1159 &elants_ver_attr_test_version.dattr.attr, 1160 &elants_ver_attr_solution_version.dattr.attr, 1161 &elants_ver_attr_bc_version.dattr.attr, 1162 &elants_ver_attr_iap_version.dattr.attr, 1163 NULL 1164 }; 1165 1166 static const struct attribute_group elants_attribute_group = { 1167 .attrs = elants_attributes, 1168 }; 1169 1170 static int elants_i2c_power_on(struct elants_data *ts) 1171 { 1172 int error; 1173 1174 /* 1175 * If we do not have reset gpio assume platform firmware 1176 * controls regulators and does power them on for us. 1177 */ 1178 if (IS_ERR_OR_NULL(ts->reset_gpio)) 1179 return 0; 1180 1181 gpiod_set_value_cansleep(ts->reset_gpio, 1); 1182 1183 error = regulator_enable(ts->vcc33); 1184 if (error) { 1185 dev_err(&ts->client->dev, 1186 "failed to enable vcc33 regulator: %d\n", 1187 error); 1188 goto release_reset_gpio; 1189 } 1190 1191 error = regulator_enable(ts->vccio); 1192 if (error) { 1193 dev_err(&ts->client->dev, 1194 "failed to enable vccio regulator: %d\n", 1195 error); 1196 regulator_disable(ts->vcc33); 1197 goto release_reset_gpio; 1198 } 1199 1200 /* 1201 * We need to wait a bit after powering on controller before 1202 * we are allowed to release reset GPIO. 1203 */ 1204 udelay(ELAN_POWERON_DELAY_USEC); 1205 1206 release_reset_gpio: 1207 gpiod_set_value_cansleep(ts->reset_gpio, 0); 1208 if (error) 1209 return error; 1210 1211 msleep(ELAN_RESET_DELAY_MSEC); 1212 1213 return 0; 1214 } 1215 1216 static void elants_i2c_power_off(void *_data) 1217 { 1218 struct elants_data *ts = _data; 1219 1220 if (!IS_ERR_OR_NULL(ts->reset_gpio)) { 1221 /* 1222 * Activate reset gpio to prevent leakage through the 1223 * pin once we shut off power to the controller. 1224 */ 1225 gpiod_set_value_cansleep(ts->reset_gpio, 1); 1226 regulator_disable(ts->vccio); 1227 regulator_disable(ts->vcc33); 1228 } 1229 } 1230 1231 static int elants_i2c_probe(struct i2c_client *client, 1232 const struct i2c_device_id *id) 1233 { 1234 union i2c_smbus_data dummy; 1235 struct elants_data *ts; 1236 unsigned long irqflags; 1237 int error; 1238 1239 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { 1240 dev_err(&client->dev, 1241 "%s: i2c check functionality error\n", DEVICE_NAME); 1242 return -ENXIO; 1243 } 1244 1245 ts = devm_kzalloc(&client->dev, sizeof(struct elants_data), GFP_KERNEL); 1246 if (!ts) 1247 return -ENOMEM; 1248 1249 mutex_init(&ts->sysfs_mutex); 1250 init_completion(&ts->cmd_done); 1251 1252 ts->client = client; 1253 i2c_set_clientdata(client, ts); 1254 1255 ts->vcc33 = devm_regulator_get(&client->dev, "vcc33"); 1256 if (IS_ERR(ts->vcc33)) { 1257 error = PTR_ERR(ts->vcc33); 1258 if (error != -EPROBE_DEFER) 1259 dev_err(&client->dev, 1260 "Failed to get 'vcc33' regulator: %d\n", 1261 error); 1262 return error; 1263 } 1264 1265 ts->vccio = devm_regulator_get(&client->dev, "vccio"); 1266 if (IS_ERR(ts->vccio)) { 1267 error = PTR_ERR(ts->vccio); 1268 if (error != -EPROBE_DEFER) 1269 dev_err(&client->dev, 1270 "Failed to get 'vccio' regulator: %d\n", 1271 error); 1272 return error; 1273 } 1274 1275 ts->reset_gpio = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW); 1276 if (IS_ERR(ts->reset_gpio)) { 1277 error = PTR_ERR(ts->reset_gpio); 1278 1279 if (error == -EPROBE_DEFER) 1280 return error; 1281 1282 if (error != -ENOENT && error != -ENOSYS) { 1283 dev_err(&client->dev, 1284 "failed to get reset gpio: %d\n", 1285 error); 1286 return error; 1287 } 1288 1289 ts->keep_power_in_suspend = true; 1290 } 1291 1292 error = elants_i2c_power_on(ts); 1293 if (error) 1294 return error; 1295 1296 error = devm_add_action(&client->dev, elants_i2c_power_off, ts); 1297 if (error) { 1298 dev_err(&client->dev, 1299 "failed to install power off action: %d\n", error); 1300 elants_i2c_power_off(ts); 1301 return error; 1302 } 1303 1304 /* Make sure there is something at this address */ 1305 if (i2c_smbus_xfer(client->adapter, client->addr, 0, 1306 I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) { 1307 dev_err(&client->dev, "nothing at this address\n"); 1308 return -ENXIO; 1309 } 1310 1311 error = elants_i2c_initialize(ts); 1312 if (error) { 1313 dev_err(&client->dev, "failed to initialize: %d\n", error); 1314 return error; 1315 } 1316 1317 ts->input = devm_input_allocate_device(&client->dev); 1318 if (!ts->input) { 1319 dev_err(&client->dev, "Failed to allocate input device\n"); 1320 return -ENOMEM; 1321 } 1322 1323 ts->input->name = "Elan Touchscreen"; 1324 ts->input->id.bustype = BUS_I2C; 1325 1326 /* Multitouch input params setup */ 1327 1328 input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0); 1329 input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0); 1330 input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); 1331 input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0); 1332 input_set_abs_params(ts->input, ABS_MT_TOOL_TYPE, 1333 0, MT_TOOL_PALM, 0, 0); 1334 input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res); 1335 input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res); 1336 if (ts->major_res > 0) 1337 input_abs_set_res(ts->input, ABS_MT_TOUCH_MAJOR, ts->major_res); 1338 1339 touchscreen_parse_properties(ts->input, true, &ts->prop); 1340 1341 error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM, 1342 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); 1343 if (error) { 1344 dev_err(&client->dev, 1345 "failed to initialize MT slots: %d\n", error); 1346 return error; 1347 } 1348 1349 error = input_register_device(ts->input); 1350 if (error) { 1351 dev_err(&client->dev, 1352 "unable to register input device: %d\n", error); 1353 return error; 1354 } 1355 1356 /* 1357 * Platform code (ACPI, DTS) should normally set up interrupt 1358 * for us, but in case it did not let's fall back to using falling 1359 * edge to be compatible with older Chromebooks. 1360 */ 1361 irqflags = irq_get_trigger_type(client->irq); 1362 if (!irqflags) 1363 irqflags = IRQF_TRIGGER_FALLING; 1364 1365 error = devm_request_threaded_irq(&client->dev, client->irq, 1366 NULL, elants_i2c_irq, 1367 irqflags | IRQF_ONESHOT, 1368 client->name, ts); 1369 if (error) { 1370 dev_err(&client->dev, "Failed to register interrupt\n"); 1371 return error; 1372 } 1373 1374 /* 1375 * Systems using device tree should set up wakeup via DTS, 1376 * the rest will configure device as wakeup source by default. 1377 */ 1378 if (!client->dev.of_node) 1379 device_init_wakeup(&client->dev, true); 1380 1381 error = devm_device_add_group(&client->dev, &elants_attribute_group); 1382 if (error) { 1383 dev_err(&client->dev, "failed to create sysfs attributes: %d\n", 1384 error); 1385 return error; 1386 } 1387 1388 return 0; 1389 } 1390 1391 static int __maybe_unused elants_i2c_suspend(struct device *dev) 1392 { 1393 struct i2c_client *client = to_i2c_client(dev); 1394 struct elants_data *ts = i2c_get_clientdata(client); 1395 const u8 set_sleep_cmd[] = { 1396 CMD_HEADER_WRITE, E_POWER_STATE_SLEEP, 0x00, 0x01 1397 }; 1398 int retry_cnt; 1399 int error; 1400 1401 /* Command not support in IAP recovery mode */ 1402 if (ts->iap_mode != ELAN_IAP_OPERATIONAL) 1403 return -EBUSY; 1404 1405 disable_irq(client->irq); 1406 1407 if (device_may_wakeup(dev)) { 1408 /* 1409 * The device will automatically enter idle mode 1410 * that has reduced power consumption. 1411 */ 1412 ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0); 1413 } else if (ts->keep_power_in_suspend) { 1414 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 1415 error = elants_i2c_send(client, set_sleep_cmd, 1416 sizeof(set_sleep_cmd)); 1417 if (!error) 1418 break; 1419 1420 dev_err(&client->dev, 1421 "suspend command failed: %d\n", error); 1422 } 1423 } else { 1424 elants_i2c_power_off(ts); 1425 } 1426 1427 return 0; 1428 } 1429 1430 static int __maybe_unused elants_i2c_resume(struct device *dev) 1431 { 1432 struct i2c_client *client = to_i2c_client(dev); 1433 struct elants_data *ts = i2c_get_clientdata(client); 1434 const u8 set_active_cmd[] = { 1435 CMD_HEADER_WRITE, E_POWER_STATE_RESUME, 0x00, 0x01 1436 }; 1437 int retry_cnt; 1438 int error; 1439 1440 if (device_may_wakeup(dev)) { 1441 if (ts->wake_irq_enabled) 1442 disable_irq_wake(client->irq); 1443 elants_i2c_sw_reset(client); 1444 } else if (ts->keep_power_in_suspend) { 1445 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 1446 error = elants_i2c_send(client, set_active_cmd, 1447 sizeof(set_active_cmd)); 1448 if (!error) 1449 break; 1450 1451 dev_err(&client->dev, 1452 "resume command failed: %d\n", error); 1453 } 1454 } else { 1455 elants_i2c_power_on(ts); 1456 elants_i2c_initialize(ts); 1457 } 1458 1459 ts->state = ELAN_STATE_NORMAL; 1460 enable_irq(client->irq); 1461 1462 return 0; 1463 } 1464 1465 static SIMPLE_DEV_PM_OPS(elants_i2c_pm_ops, 1466 elants_i2c_suspend, elants_i2c_resume); 1467 1468 static const struct i2c_device_id elants_i2c_id[] = { 1469 { DEVICE_NAME, 0 }, 1470 { } 1471 }; 1472 MODULE_DEVICE_TABLE(i2c, elants_i2c_id); 1473 1474 #ifdef CONFIG_ACPI 1475 static const struct acpi_device_id elants_acpi_id[] = { 1476 { "ELAN0001", 0 }, 1477 { } 1478 }; 1479 MODULE_DEVICE_TABLE(acpi, elants_acpi_id); 1480 #endif 1481 1482 #ifdef CONFIG_OF 1483 static const struct of_device_id elants_of_match[] = { 1484 { .compatible = "elan,ekth3500" }, 1485 { /* sentinel */ } 1486 }; 1487 MODULE_DEVICE_TABLE(of, elants_of_match); 1488 #endif 1489 1490 static struct i2c_driver elants_i2c_driver = { 1491 .probe = elants_i2c_probe, 1492 .id_table = elants_i2c_id, 1493 .driver = { 1494 .name = DEVICE_NAME, 1495 .pm = &elants_i2c_pm_ops, 1496 .acpi_match_table = ACPI_PTR(elants_acpi_id), 1497 .of_match_table = of_match_ptr(elants_of_match), 1498 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1499 }, 1500 }; 1501 module_i2c_driver(elants_i2c_driver); 1502 1503 MODULE_AUTHOR("Scott Liu <scott.liu@emc.com.tw>"); 1504 MODULE_DESCRIPTION("Elan I2c Touchscreen driver"); 1505 MODULE_LICENSE("GPL"); 1506