1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Driver for Goodix Touchscreens 4 * 5 * Copyright (c) 2014 Red Hat Inc. 6 * Copyright (c) 2015 K. Merker <merker@debian.org> 7 * 8 * This code is based on gt9xx.c authored by andrew@goodix.com: 9 * 10 * 2010 - 2012 Goodix Technology. 11 */ 12 13 14 #include <linux/kernel.h> 15 #include <linux/dmi.h> 16 #include <linux/firmware.h> 17 #include <linux/gpio/consumer.h> 18 #include <linux/i2c.h> 19 #include <linux/input.h> 20 #include <linux/input/mt.h> 21 #include <linux/input/touchscreen.h> 22 #include <linux/module.h> 23 #include <linux/delay.h> 24 #include <linux/irq.h> 25 #include <linux/interrupt.h> 26 #include <linux/regulator/consumer.h> 27 #include <linux/slab.h> 28 #include <linux/acpi.h> 29 #include <linux/of.h> 30 #include <asm/unaligned.h> 31 32 #define GOODIX_GPIO_INT_NAME "irq" 33 #define GOODIX_GPIO_RST_NAME "reset" 34 35 #define GOODIX_MAX_HEIGHT 4096 36 #define GOODIX_MAX_WIDTH 4096 37 #define GOODIX_INT_TRIGGER 1 38 #define GOODIX_CONTACT_SIZE 8 39 #define GOODIX_MAX_CONTACT_SIZE 9 40 #define GOODIX_MAX_CONTACTS 10 41 #define GOODIX_MAX_KEYS 7 42 43 #define GOODIX_CONFIG_MIN_LENGTH 186 44 #define GOODIX_CONFIG_911_LENGTH 186 45 #define GOODIX_CONFIG_967_LENGTH 228 46 #define GOODIX_CONFIG_GT9X_LENGTH 240 47 #define GOODIX_CONFIG_MAX_LENGTH 240 48 49 /* Register defines */ 50 #define GOODIX_REG_COMMAND 0x8040 51 #define GOODIX_CMD_SCREEN_OFF 0x05 52 53 #define GOODIX_READ_COOR_ADDR 0x814E 54 #define GOODIX_GT1X_REG_CONFIG_DATA 0x8050 55 #define GOODIX_GT9X_REG_CONFIG_DATA 0x8047 56 #define GOODIX_REG_ID 0x8140 57 58 #define GOODIX_BUFFER_STATUS_READY BIT(7) 59 #define GOODIX_HAVE_KEY BIT(4) 60 #define GOODIX_BUFFER_STATUS_TIMEOUT 20 61 62 #define RESOLUTION_LOC 1 63 #define MAX_CONTACTS_LOC 5 64 #define TRIGGER_LOC 6 65 66 /* Our special handling for GPIO accesses through ACPI is x86 specific */ 67 #if defined CONFIG_X86 && defined CONFIG_ACPI 68 #define ACPI_GPIO_SUPPORT 69 #endif 70 71 struct goodix_ts_data; 72 73 enum goodix_irq_pin_access_method { 74 IRQ_PIN_ACCESS_NONE, 75 IRQ_PIN_ACCESS_GPIO, 76 IRQ_PIN_ACCESS_ACPI_GPIO, 77 IRQ_PIN_ACCESS_ACPI_METHOD, 78 }; 79 80 struct goodix_chip_data { 81 u16 config_addr; 82 int config_len; 83 int (*check_config)(struct goodix_ts_data *ts, const u8 *cfg, int len); 84 void (*calc_config_checksum)(struct goodix_ts_data *ts); 85 }; 86 87 struct goodix_chip_id { 88 const char *id; 89 const struct goodix_chip_data *data; 90 }; 91 92 #define GOODIX_ID_MAX_LEN 4 93 94 struct goodix_ts_data { 95 struct i2c_client *client; 96 struct input_dev *input_dev; 97 const struct goodix_chip_data *chip; 98 struct touchscreen_properties prop; 99 unsigned int max_touch_num; 100 unsigned int int_trigger_type; 101 struct regulator *avdd28; 102 struct regulator *vddio; 103 struct gpio_desc *gpiod_int; 104 struct gpio_desc *gpiod_rst; 105 int gpio_count; 106 int gpio_int_idx; 107 char id[GOODIX_ID_MAX_LEN + 1]; 108 u16 version; 109 const char *cfg_name; 110 bool reset_controller_at_probe; 111 bool load_cfg_from_disk; 112 struct completion firmware_loading_complete; 113 unsigned long irq_flags; 114 enum goodix_irq_pin_access_method irq_pin_access_method; 115 unsigned int contact_size; 116 u8 config[GOODIX_CONFIG_MAX_LENGTH]; 117 unsigned short keymap[GOODIX_MAX_KEYS]; 118 }; 119 120 static int goodix_check_cfg_8(struct goodix_ts_data *ts, 121 const u8 *cfg, int len); 122 static int goodix_check_cfg_16(struct goodix_ts_data *ts, 123 const u8 *cfg, int len); 124 static void goodix_calc_cfg_checksum_8(struct goodix_ts_data *ts); 125 static void goodix_calc_cfg_checksum_16(struct goodix_ts_data *ts); 126 127 static const struct goodix_chip_data gt1x_chip_data = { 128 .config_addr = GOODIX_GT1X_REG_CONFIG_DATA, 129 .config_len = GOODIX_CONFIG_GT9X_LENGTH, 130 .check_config = goodix_check_cfg_16, 131 .calc_config_checksum = goodix_calc_cfg_checksum_16, 132 }; 133 134 static const struct goodix_chip_data gt911_chip_data = { 135 .config_addr = GOODIX_GT9X_REG_CONFIG_DATA, 136 .config_len = GOODIX_CONFIG_911_LENGTH, 137 .check_config = goodix_check_cfg_8, 138 .calc_config_checksum = goodix_calc_cfg_checksum_8, 139 }; 140 141 static const struct goodix_chip_data gt967_chip_data = { 142 .config_addr = GOODIX_GT9X_REG_CONFIG_DATA, 143 .config_len = GOODIX_CONFIG_967_LENGTH, 144 .check_config = goodix_check_cfg_8, 145 .calc_config_checksum = goodix_calc_cfg_checksum_8, 146 }; 147 148 static const struct goodix_chip_data gt9x_chip_data = { 149 .config_addr = GOODIX_GT9X_REG_CONFIG_DATA, 150 .config_len = GOODIX_CONFIG_GT9X_LENGTH, 151 .check_config = goodix_check_cfg_8, 152 .calc_config_checksum = goodix_calc_cfg_checksum_8, 153 }; 154 155 static const struct goodix_chip_id goodix_chip_ids[] = { 156 { .id = "1151", .data = >1x_chip_data }, 157 { .id = "5663", .data = >1x_chip_data }, 158 { .id = "5688", .data = >1x_chip_data }, 159 { .id = "917S", .data = >1x_chip_data }, 160 { .id = "9286", .data = >1x_chip_data }, 161 162 { .id = "911", .data = >911_chip_data }, 163 { .id = "9271", .data = >911_chip_data }, 164 { .id = "9110", .data = >911_chip_data }, 165 { .id = "927", .data = >911_chip_data }, 166 { .id = "928", .data = >911_chip_data }, 167 168 { .id = "912", .data = >967_chip_data }, 169 { .id = "9147", .data = >967_chip_data }, 170 { .id = "967", .data = >967_chip_data }, 171 { } 172 }; 173 174 static const unsigned long goodix_irq_flags[] = { 175 IRQ_TYPE_EDGE_RISING, 176 IRQ_TYPE_EDGE_FALLING, 177 IRQ_TYPE_LEVEL_LOW, 178 IRQ_TYPE_LEVEL_HIGH, 179 }; 180 181 static const struct dmi_system_id nine_bytes_report[] = { 182 #if defined(CONFIG_DMI) && defined(CONFIG_X86) 183 { 184 .ident = "Lenovo YogaBook", 185 /* YB1-X91L/F and YB1-X90L/F */ 186 .matches = { 187 DMI_MATCH(DMI_PRODUCT_NAME, "Lenovo YB1-X9") 188 } 189 }, 190 #endif 191 {} 192 }; 193 194 /* 195 * Those tablets have their x coordinate inverted 196 */ 197 static const struct dmi_system_id inverted_x_screen[] = { 198 #if defined(CONFIG_DMI) && defined(CONFIG_X86) 199 { 200 .ident = "Cube I15-TC", 201 .matches = { 202 DMI_MATCH(DMI_SYS_VENDOR, "Cube"), 203 DMI_MATCH(DMI_PRODUCT_NAME, "I15-TC") 204 }, 205 }, 206 #endif 207 {} 208 }; 209 210 /** 211 * goodix_i2c_read - read data from a register of the i2c slave device. 212 * 213 * @client: i2c device. 214 * @reg: the register to read from. 215 * @buf: raw write data buffer. 216 * @len: length of the buffer to write 217 */ 218 static int goodix_i2c_read(struct i2c_client *client, 219 u16 reg, u8 *buf, int len) 220 { 221 struct i2c_msg msgs[2]; 222 __be16 wbuf = cpu_to_be16(reg); 223 int ret; 224 225 msgs[0].flags = 0; 226 msgs[0].addr = client->addr; 227 msgs[0].len = 2; 228 msgs[0].buf = (u8 *)&wbuf; 229 230 msgs[1].flags = I2C_M_RD; 231 msgs[1].addr = client->addr; 232 msgs[1].len = len; 233 msgs[1].buf = buf; 234 235 ret = i2c_transfer(client->adapter, msgs, 2); 236 return ret < 0 ? ret : (ret != ARRAY_SIZE(msgs) ? -EIO : 0); 237 } 238 239 /** 240 * goodix_i2c_write - write data to a register of the i2c slave device. 241 * 242 * @client: i2c device. 243 * @reg: the register to write to. 244 * @buf: raw data buffer to write. 245 * @len: length of the buffer to write 246 */ 247 static int goodix_i2c_write(struct i2c_client *client, u16 reg, const u8 *buf, 248 unsigned len) 249 { 250 u8 *addr_buf; 251 struct i2c_msg msg; 252 int ret; 253 254 addr_buf = kmalloc(len + 2, GFP_KERNEL); 255 if (!addr_buf) 256 return -ENOMEM; 257 258 addr_buf[0] = reg >> 8; 259 addr_buf[1] = reg & 0xFF; 260 memcpy(&addr_buf[2], buf, len); 261 262 msg.flags = 0; 263 msg.addr = client->addr; 264 msg.buf = addr_buf; 265 msg.len = len + 2; 266 267 ret = i2c_transfer(client->adapter, &msg, 1); 268 kfree(addr_buf); 269 return ret < 0 ? ret : (ret != 1 ? -EIO : 0); 270 } 271 272 static int goodix_i2c_write_u8(struct i2c_client *client, u16 reg, u8 value) 273 { 274 return goodix_i2c_write(client, reg, &value, sizeof(value)); 275 } 276 277 static const struct goodix_chip_data *goodix_get_chip_data(const char *id) 278 { 279 unsigned int i; 280 281 for (i = 0; goodix_chip_ids[i].id; i++) { 282 if (!strcmp(goodix_chip_ids[i].id, id)) 283 return goodix_chip_ids[i].data; 284 } 285 286 return >9x_chip_data; 287 } 288 289 static int goodix_ts_read_input_report(struct goodix_ts_data *ts, u8 *data) 290 { 291 unsigned long max_timeout; 292 int touch_num; 293 int error; 294 u16 addr = GOODIX_READ_COOR_ADDR; 295 /* 296 * We are going to read 1-byte header, 297 * ts->contact_size * max(1, touch_num) bytes of coordinates 298 * and 1-byte footer which contains the touch-key code. 299 */ 300 const int header_contact_keycode_size = 1 + ts->contact_size + 1; 301 302 /* 303 * The 'buffer status' bit, which indicates that the data is valid, is 304 * not set as soon as the interrupt is raised, but slightly after. 305 * This takes around 10 ms to happen, so we poll for 20 ms. 306 */ 307 max_timeout = jiffies + msecs_to_jiffies(GOODIX_BUFFER_STATUS_TIMEOUT); 308 do { 309 error = goodix_i2c_read(ts->client, addr, data, 310 header_contact_keycode_size); 311 if (error) { 312 dev_err(&ts->client->dev, "I2C transfer error: %d\n", 313 error); 314 return error; 315 } 316 317 if (data[0] & GOODIX_BUFFER_STATUS_READY) { 318 touch_num = data[0] & 0x0f; 319 if (touch_num > ts->max_touch_num) 320 return -EPROTO; 321 322 if (touch_num > 1) { 323 addr += header_contact_keycode_size; 324 data += header_contact_keycode_size; 325 error = goodix_i2c_read(ts->client, 326 addr, data, 327 ts->contact_size * 328 (touch_num - 1)); 329 if (error) 330 return error; 331 } 332 333 return touch_num; 334 } 335 336 usleep_range(1000, 2000); /* Poll every 1 - 2 ms */ 337 } while (time_before(jiffies, max_timeout)); 338 339 /* 340 * The Goodix panel will send spurious interrupts after a 341 * 'finger up' event, which will always cause a timeout. 342 */ 343 return -ENOMSG; 344 } 345 346 static void goodix_ts_report_touch_8b(struct goodix_ts_data *ts, u8 *coor_data) 347 { 348 int id = coor_data[0] & 0x0F; 349 int input_x = get_unaligned_le16(&coor_data[1]); 350 int input_y = get_unaligned_le16(&coor_data[3]); 351 int input_w = get_unaligned_le16(&coor_data[5]); 352 353 input_mt_slot(ts->input_dev, id); 354 input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true); 355 touchscreen_report_pos(ts->input_dev, &ts->prop, 356 input_x, input_y, true); 357 input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, input_w); 358 input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w); 359 } 360 361 static void goodix_ts_report_touch_9b(struct goodix_ts_data *ts, u8 *coor_data) 362 { 363 int id = coor_data[1] & 0x0F; 364 int input_x = get_unaligned_le16(&coor_data[3]); 365 int input_y = get_unaligned_le16(&coor_data[5]); 366 int input_w = get_unaligned_le16(&coor_data[7]); 367 368 input_mt_slot(ts->input_dev, id); 369 input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true); 370 touchscreen_report_pos(ts->input_dev, &ts->prop, 371 input_x, input_y, true); 372 input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, input_w); 373 input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w); 374 } 375 376 static void goodix_ts_report_key(struct goodix_ts_data *ts, u8 *data) 377 { 378 int touch_num; 379 u8 key_value; 380 int i; 381 382 if (data[0] & GOODIX_HAVE_KEY) { 383 touch_num = data[0] & 0x0f; 384 key_value = data[1 + ts->contact_size * touch_num]; 385 for (i = 0; i < GOODIX_MAX_KEYS; i++) 386 if (key_value & BIT(i)) 387 input_report_key(ts->input_dev, 388 ts->keymap[i], 1); 389 } else { 390 for (i = 0; i < GOODIX_MAX_KEYS; i++) 391 input_report_key(ts->input_dev, ts->keymap[i], 0); 392 } 393 } 394 395 /** 396 * goodix_process_events - Process incoming events 397 * 398 * @ts: our goodix_ts_data pointer 399 * 400 * Called when the IRQ is triggered. Read the current device state, and push 401 * the input events to the user space. 402 */ 403 static void goodix_process_events(struct goodix_ts_data *ts) 404 { 405 u8 point_data[2 + GOODIX_MAX_CONTACT_SIZE * GOODIX_MAX_CONTACTS]; 406 int touch_num; 407 int i; 408 409 touch_num = goodix_ts_read_input_report(ts, point_data); 410 if (touch_num < 0) 411 return; 412 413 goodix_ts_report_key(ts, point_data); 414 415 for (i = 0; i < touch_num; i++) 416 if (ts->contact_size == 9) 417 goodix_ts_report_touch_9b(ts, 418 &point_data[1 + ts->contact_size * i]); 419 else 420 goodix_ts_report_touch_8b(ts, 421 &point_data[1 + ts->contact_size * i]); 422 423 input_mt_sync_frame(ts->input_dev); 424 input_sync(ts->input_dev); 425 } 426 427 /** 428 * goodix_ts_irq_handler - The IRQ handler 429 * 430 * @irq: interrupt number. 431 * @dev_id: private data pointer. 432 */ 433 static irqreturn_t goodix_ts_irq_handler(int irq, void *dev_id) 434 { 435 struct goodix_ts_data *ts = dev_id; 436 437 goodix_process_events(ts); 438 439 if (goodix_i2c_write_u8(ts->client, GOODIX_READ_COOR_ADDR, 0) < 0) 440 dev_err(&ts->client->dev, "I2C write end_cmd error\n"); 441 442 return IRQ_HANDLED; 443 } 444 445 static void goodix_free_irq(struct goodix_ts_data *ts) 446 { 447 devm_free_irq(&ts->client->dev, ts->client->irq, ts); 448 } 449 450 static int goodix_request_irq(struct goodix_ts_data *ts) 451 { 452 return devm_request_threaded_irq(&ts->client->dev, ts->client->irq, 453 NULL, goodix_ts_irq_handler, 454 ts->irq_flags, ts->client->name, ts); 455 } 456 457 static int goodix_check_cfg_8(struct goodix_ts_data *ts, const u8 *cfg, int len) 458 { 459 int i, raw_cfg_len = len - 2; 460 u8 check_sum = 0; 461 462 for (i = 0; i < raw_cfg_len; i++) 463 check_sum += cfg[i]; 464 check_sum = (~check_sum) + 1; 465 if (check_sum != cfg[raw_cfg_len]) { 466 dev_err(&ts->client->dev, 467 "The checksum of the config fw is not correct"); 468 return -EINVAL; 469 } 470 471 if (cfg[raw_cfg_len + 1] != 1) { 472 dev_err(&ts->client->dev, 473 "Config fw must have Config_Fresh register set"); 474 return -EINVAL; 475 } 476 477 return 0; 478 } 479 480 static void goodix_calc_cfg_checksum_8(struct goodix_ts_data *ts) 481 { 482 int i, raw_cfg_len = ts->chip->config_len - 2; 483 u8 check_sum = 0; 484 485 for (i = 0; i < raw_cfg_len; i++) 486 check_sum += ts->config[i]; 487 check_sum = (~check_sum) + 1; 488 489 ts->config[raw_cfg_len] = check_sum; 490 ts->config[raw_cfg_len + 1] = 1; /* Set "config_fresh" bit */ 491 } 492 493 static int goodix_check_cfg_16(struct goodix_ts_data *ts, const u8 *cfg, 494 int len) 495 { 496 int i, raw_cfg_len = len - 3; 497 u16 check_sum = 0; 498 499 for (i = 0; i < raw_cfg_len; i += 2) 500 check_sum += get_unaligned_be16(&cfg[i]); 501 check_sum = (~check_sum) + 1; 502 if (check_sum != get_unaligned_be16(&cfg[raw_cfg_len])) { 503 dev_err(&ts->client->dev, 504 "The checksum of the config fw is not correct"); 505 return -EINVAL; 506 } 507 508 if (cfg[raw_cfg_len + 2] != 1) { 509 dev_err(&ts->client->dev, 510 "Config fw must have Config_Fresh register set"); 511 return -EINVAL; 512 } 513 514 return 0; 515 } 516 517 static void goodix_calc_cfg_checksum_16(struct goodix_ts_data *ts) 518 { 519 int i, raw_cfg_len = ts->chip->config_len - 3; 520 u16 check_sum = 0; 521 522 for (i = 0; i < raw_cfg_len; i += 2) 523 check_sum += get_unaligned_be16(&ts->config[i]); 524 check_sum = (~check_sum) + 1; 525 526 put_unaligned_be16(check_sum, &ts->config[raw_cfg_len]); 527 ts->config[raw_cfg_len + 2] = 1; /* Set "config_fresh" bit */ 528 } 529 530 /** 531 * goodix_check_cfg - Checks if config fw is valid 532 * 533 * @ts: goodix_ts_data pointer 534 * @cfg: firmware config data 535 */ 536 static int goodix_check_cfg(struct goodix_ts_data *ts, const u8 *cfg, int len) 537 { 538 if (len < GOODIX_CONFIG_MIN_LENGTH || 539 len > GOODIX_CONFIG_MAX_LENGTH) { 540 dev_err(&ts->client->dev, 541 "The length of the config fw is not correct"); 542 return -EINVAL; 543 } 544 545 return ts->chip->check_config(ts, cfg, len); 546 } 547 548 /** 549 * goodix_send_cfg - Write fw config to device 550 * 551 * @ts: goodix_ts_data pointer 552 * @cfg: config firmware to write to device 553 */ 554 static int goodix_send_cfg(struct goodix_ts_data *ts, const u8 *cfg, int len) 555 { 556 int error; 557 558 error = goodix_check_cfg(ts, cfg, len); 559 if (error) 560 return error; 561 562 error = goodix_i2c_write(ts->client, ts->chip->config_addr, cfg, len); 563 if (error) { 564 dev_err(&ts->client->dev, "Failed to write config data: %d", 565 error); 566 return error; 567 } 568 dev_dbg(&ts->client->dev, "Config sent successfully."); 569 570 /* Let the firmware reconfigure itself, so sleep for 10ms */ 571 usleep_range(10000, 11000); 572 573 return 0; 574 } 575 576 #ifdef ACPI_GPIO_SUPPORT 577 static int goodix_pin_acpi_direction_input(struct goodix_ts_data *ts) 578 { 579 acpi_handle handle = ACPI_HANDLE(&ts->client->dev); 580 acpi_status status; 581 582 status = acpi_evaluate_object(handle, "INTI", NULL, NULL); 583 return ACPI_SUCCESS(status) ? 0 : -EIO; 584 } 585 586 static int goodix_pin_acpi_output_method(struct goodix_ts_data *ts, int value) 587 { 588 acpi_handle handle = ACPI_HANDLE(&ts->client->dev); 589 acpi_status status; 590 591 status = acpi_execute_simple_method(handle, "INTO", value); 592 return ACPI_SUCCESS(status) ? 0 : -EIO; 593 } 594 #else 595 static int goodix_pin_acpi_direction_input(struct goodix_ts_data *ts) 596 { 597 dev_err(&ts->client->dev, 598 "%s called on device without ACPI support\n", __func__); 599 return -EINVAL; 600 } 601 602 static int goodix_pin_acpi_output_method(struct goodix_ts_data *ts, int value) 603 { 604 dev_err(&ts->client->dev, 605 "%s called on device without ACPI support\n", __func__); 606 return -EINVAL; 607 } 608 #endif 609 610 static int goodix_irq_direction_output(struct goodix_ts_data *ts, int value) 611 { 612 switch (ts->irq_pin_access_method) { 613 case IRQ_PIN_ACCESS_NONE: 614 dev_err(&ts->client->dev, 615 "%s called without an irq_pin_access_method set\n", 616 __func__); 617 return -EINVAL; 618 case IRQ_PIN_ACCESS_GPIO: 619 return gpiod_direction_output(ts->gpiod_int, value); 620 case IRQ_PIN_ACCESS_ACPI_GPIO: 621 /* 622 * The IRQ pin triggers on a falling edge, so its gets marked 623 * as active-low, use output_raw to avoid the value inversion. 624 */ 625 return gpiod_direction_output_raw(ts->gpiod_int, value); 626 case IRQ_PIN_ACCESS_ACPI_METHOD: 627 return goodix_pin_acpi_output_method(ts, value); 628 } 629 630 return -EINVAL; /* Never reached */ 631 } 632 633 static int goodix_irq_direction_input(struct goodix_ts_data *ts) 634 { 635 switch (ts->irq_pin_access_method) { 636 case IRQ_PIN_ACCESS_NONE: 637 dev_err(&ts->client->dev, 638 "%s called without an irq_pin_access_method set\n", 639 __func__); 640 return -EINVAL; 641 case IRQ_PIN_ACCESS_GPIO: 642 return gpiod_direction_input(ts->gpiod_int); 643 case IRQ_PIN_ACCESS_ACPI_GPIO: 644 return gpiod_direction_input(ts->gpiod_int); 645 case IRQ_PIN_ACCESS_ACPI_METHOD: 646 return goodix_pin_acpi_direction_input(ts); 647 } 648 649 return -EINVAL; /* Never reached */ 650 } 651 652 static int goodix_int_sync(struct goodix_ts_data *ts) 653 { 654 int error; 655 656 error = goodix_irq_direction_output(ts, 0); 657 if (error) 658 return error; 659 660 msleep(50); /* T5: 50ms */ 661 662 error = goodix_irq_direction_input(ts); 663 if (error) 664 return error; 665 666 return 0; 667 } 668 669 /** 670 * goodix_reset - Reset device during power on 671 * 672 * @ts: goodix_ts_data pointer 673 */ 674 static int goodix_reset(struct goodix_ts_data *ts) 675 { 676 int error; 677 678 /* begin select I2C slave addr */ 679 error = gpiod_direction_output(ts->gpiod_rst, 0); 680 if (error) 681 return error; 682 683 msleep(20); /* T2: > 10ms */ 684 685 /* HIGH: 0x28/0x29, LOW: 0xBA/0xBB */ 686 error = goodix_irq_direction_output(ts, ts->client->addr == 0x14); 687 if (error) 688 return error; 689 690 usleep_range(100, 2000); /* T3: > 100us */ 691 692 error = gpiod_direction_output(ts->gpiod_rst, 1); 693 if (error) 694 return error; 695 696 usleep_range(6000, 10000); /* T4: > 5ms */ 697 698 /* end select I2C slave addr */ 699 error = gpiod_direction_input(ts->gpiod_rst); 700 if (error) 701 return error; 702 703 error = goodix_int_sync(ts); 704 if (error) 705 return error; 706 707 return 0; 708 } 709 710 #ifdef ACPI_GPIO_SUPPORT 711 #include <asm/cpu_device_id.h> 712 #include <asm/intel-family.h> 713 714 static const struct x86_cpu_id baytrail_cpu_ids[] = { 715 { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SILVERMONT, X86_FEATURE_ANY, }, 716 {} 717 }; 718 719 static inline bool is_byt(void) 720 { 721 const struct x86_cpu_id *id = x86_match_cpu(baytrail_cpu_ids); 722 723 return !!id; 724 } 725 726 static const struct acpi_gpio_params first_gpio = { 0, 0, false }; 727 static const struct acpi_gpio_params second_gpio = { 1, 0, false }; 728 729 static const struct acpi_gpio_mapping acpi_goodix_int_first_gpios[] = { 730 { GOODIX_GPIO_INT_NAME "-gpios", &first_gpio, 1 }, 731 { GOODIX_GPIO_RST_NAME "-gpios", &second_gpio, 1 }, 732 { }, 733 }; 734 735 static const struct acpi_gpio_mapping acpi_goodix_int_last_gpios[] = { 736 { GOODIX_GPIO_RST_NAME "-gpios", &first_gpio, 1 }, 737 { GOODIX_GPIO_INT_NAME "-gpios", &second_gpio, 1 }, 738 { }, 739 }; 740 741 static const struct acpi_gpio_mapping acpi_goodix_reset_only_gpios[] = { 742 { GOODIX_GPIO_RST_NAME "-gpios", &first_gpio, 1 }, 743 { }, 744 }; 745 746 static int goodix_resource(struct acpi_resource *ares, void *data) 747 { 748 struct goodix_ts_data *ts = data; 749 struct device *dev = &ts->client->dev; 750 struct acpi_resource_gpio *gpio; 751 752 switch (ares->type) { 753 case ACPI_RESOURCE_TYPE_GPIO: 754 gpio = &ares->data.gpio; 755 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) { 756 if (ts->gpio_int_idx == -1) { 757 ts->gpio_int_idx = ts->gpio_count; 758 } else { 759 dev_err(dev, "More then one GpioInt resource, ignoring ACPI GPIO resources\n"); 760 ts->gpio_int_idx = -2; 761 } 762 } 763 ts->gpio_count++; 764 break; 765 default: 766 break; 767 } 768 769 return 0; 770 } 771 772 /* 773 * This function gets called in case we fail to get the irq GPIO directly 774 * because the ACPI tables lack GPIO-name to APCI _CRS index mappings 775 * (no _DSD UUID daffd814-6eba-4d8c-8a91-bc9bbf4aa301 data). 776 * In that case we add our own mapping and then goodix_get_gpio_config() 777 * retries to get the GPIOs based on the added mapping. 778 */ 779 static int goodix_add_acpi_gpio_mappings(struct goodix_ts_data *ts) 780 { 781 const struct acpi_gpio_mapping *gpio_mapping = NULL; 782 struct device *dev = &ts->client->dev; 783 LIST_HEAD(resources); 784 int ret; 785 786 ts->gpio_count = 0; 787 ts->gpio_int_idx = -1; 788 ret = acpi_dev_get_resources(ACPI_COMPANION(dev), &resources, 789 goodix_resource, ts); 790 if (ret < 0) { 791 dev_err(dev, "Error getting ACPI resources: %d\n", ret); 792 return ret; 793 } 794 795 acpi_dev_free_resource_list(&resources); 796 797 if (ts->gpio_count == 2 && ts->gpio_int_idx == 0) { 798 ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_GPIO; 799 gpio_mapping = acpi_goodix_int_first_gpios; 800 } else if (ts->gpio_count == 2 && ts->gpio_int_idx == 1) { 801 ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_GPIO; 802 gpio_mapping = acpi_goodix_int_last_gpios; 803 } else if (ts->gpio_count == 1 && ts->gpio_int_idx == -1 && 804 acpi_has_method(ACPI_HANDLE(dev), "INTI") && 805 acpi_has_method(ACPI_HANDLE(dev), "INTO")) { 806 dev_info(dev, "Using ACPI INTI and INTO methods for IRQ pin access\n"); 807 ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_METHOD; 808 gpio_mapping = acpi_goodix_reset_only_gpios; 809 } else if (is_byt() && ts->gpio_count == 2 && ts->gpio_int_idx == -1) { 810 dev_info(dev, "No ACPI GpioInt resource, assuming that the GPIO order is reset, int\n"); 811 ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_GPIO; 812 gpio_mapping = acpi_goodix_int_last_gpios; 813 } else { 814 dev_warn(dev, "Unexpected ACPI resources: gpio_count %d, gpio_int_idx %d\n", 815 ts->gpio_count, ts->gpio_int_idx); 816 return -EINVAL; 817 } 818 819 return devm_acpi_dev_add_driver_gpios(dev, gpio_mapping); 820 } 821 #else 822 static int goodix_add_acpi_gpio_mappings(struct goodix_ts_data *ts) 823 { 824 return -EINVAL; 825 } 826 #endif /* CONFIG_X86 && CONFIG_ACPI */ 827 828 /** 829 * goodix_get_gpio_config - Get GPIO config from ACPI/DT 830 * 831 * @ts: goodix_ts_data pointer 832 */ 833 static int goodix_get_gpio_config(struct goodix_ts_data *ts) 834 { 835 int error; 836 struct device *dev; 837 struct gpio_desc *gpiod; 838 bool added_acpi_mappings = false; 839 840 if (!ts->client) 841 return -EINVAL; 842 dev = &ts->client->dev; 843 844 ts->avdd28 = devm_regulator_get(dev, "AVDD28"); 845 if (IS_ERR(ts->avdd28)) { 846 error = PTR_ERR(ts->avdd28); 847 if (error != -EPROBE_DEFER) 848 dev_err(dev, 849 "Failed to get AVDD28 regulator: %d\n", error); 850 return error; 851 } 852 853 ts->vddio = devm_regulator_get(dev, "VDDIO"); 854 if (IS_ERR(ts->vddio)) { 855 error = PTR_ERR(ts->vddio); 856 if (error != -EPROBE_DEFER) 857 dev_err(dev, 858 "Failed to get VDDIO regulator: %d\n", error); 859 return error; 860 } 861 862 retry_get_irq_gpio: 863 /* Get the interrupt GPIO pin number */ 864 gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_INT_NAME, GPIOD_IN); 865 if (IS_ERR(gpiod)) { 866 error = PTR_ERR(gpiod); 867 if (error != -EPROBE_DEFER) 868 dev_dbg(dev, "Failed to get %s GPIO: %d\n", 869 GOODIX_GPIO_INT_NAME, error); 870 return error; 871 } 872 if (!gpiod && has_acpi_companion(dev) && !added_acpi_mappings) { 873 added_acpi_mappings = true; 874 if (goodix_add_acpi_gpio_mappings(ts) == 0) 875 goto retry_get_irq_gpio; 876 } 877 878 ts->gpiod_int = gpiod; 879 880 /* Get the reset line GPIO pin number */ 881 gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_RST_NAME, GPIOD_IN); 882 if (IS_ERR(gpiod)) { 883 error = PTR_ERR(gpiod); 884 if (error != -EPROBE_DEFER) 885 dev_dbg(dev, "Failed to get %s GPIO: %d\n", 886 GOODIX_GPIO_RST_NAME, error); 887 return error; 888 } 889 890 ts->gpiod_rst = gpiod; 891 892 switch (ts->irq_pin_access_method) { 893 case IRQ_PIN_ACCESS_ACPI_GPIO: 894 /* 895 * We end up here if goodix_add_acpi_gpio_mappings() has 896 * called devm_acpi_dev_add_driver_gpios() because the ACPI 897 * tables did not contain name to index mappings. 898 * Check that we successfully got both GPIOs after we've 899 * added our own acpi_gpio_mapping and if we did not get both 900 * GPIOs reset irq_pin_access_method to IRQ_PIN_ACCESS_NONE. 901 */ 902 if (!ts->gpiod_int || !ts->gpiod_rst) 903 ts->irq_pin_access_method = IRQ_PIN_ACCESS_NONE; 904 break; 905 case IRQ_PIN_ACCESS_ACPI_METHOD: 906 if (!ts->gpiod_rst) 907 ts->irq_pin_access_method = IRQ_PIN_ACCESS_NONE; 908 break; 909 default: 910 if (ts->gpiod_int && ts->gpiod_rst) { 911 ts->reset_controller_at_probe = true; 912 ts->load_cfg_from_disk = true; 913 ts->irq_pin_access_method = IRQ_PIN_ACCESS_GPIO; 914 } 915 } 916 917 return 0; 918 } 919 920 /** 921 * goodix_read_config - Read the embedded configuration of the panel 922 * 923 * @ts: our goodix_ts_data pointer 924 * 925 * Must be called during probe 926 */ 927 static void goodix_read_config(struct goodix_ts_data *ts) 928 { 929 int x_max, y_max; 930 int error; 931 932 error = goodix_i2c_read(ts->client, ts->chip->config_addr, 933 ts->config, ts->chip->config_len); 934 if (error) { 935 dev_warn(&ts->client->dev, "Error reading config: %d\n", 936 error); 937 ts->int_trigger_type = GOODIX_INT_TRIGGER; 938 ts->max_touch_num = GOODIX_MAX_CONTACTS; 939 return; 940 } 941 942 ts->int_trigger_type = ts->config[TRIGGER_LOC] & 0x03; 943 ts->max_touch_num = ts->config[MAX_CONTACTS_LOC] & 0x0f; 944 945 x_max = get_unaligned_le16(&ts->config[RESOLUTION_LOC]); 946 y_max = get_unaligned_le16(&ts->config[RESOLUTION_LOC + 2]); 947 if (x_max && y_max) { 948 input_abs_set_max(ts->input_dev, ABS_MT_POSITION_X, x_max - 1); 949 input_abs_set_max(ts->input_dev, ABS_MT_POSITION_Y, y_max - 1); 950 } 951 952 ts->chip->calc_config_checksum(ts); 953 } 954 955 /** 956 * goodix_read_version - Read goodix touchscreen version 957 * 958 * @ts: our goodix_ts_data pointer 959 */ 960 static int goodix_read_version(struct goodix_ts_data *ts) 961 { 962 int error; 963 u8 buf[6]; 964 char id_str[GOODIX_ID_MAX_LEN + 1]; 965 966 error = goodix_i2c_read(ts->client, GOODIX_REG_ID, buf, sizeof(buf)); 967 if (error) { 968 dev_err(&ts->client->dev, "read version failed: %d\n", error); 969 return error; 970 } 971 972 memcpy(id_str, buf, GOODIX_ID_MAX_LEN); 973 id_str[GOODIX_ID_MAX_LEN] = 0; 974 strscpy(ts->id, id_str, GOODIX_ID_MAX_LEN + 1); 975 976 ts->version = get_unaligned_le16(&buf[4]); 977 978 dev_info(&ts->client->dev, "ID %s, version: %04x\n", ts->id, 979 ts->version); 980 981 return 0; 982 } 983 984 /** 985 * goodix_i2c_test - I2C test function to check if the device answers. 986 * 987 * @client: the i2c client 988 */ 989 static int goodix_i2c_test(struct i2c_client *client) 990 { 991 int retry = 0; 992 int error; 993 u8 test; 994 995 while (retry++ < 2) { 996 error = goodix_i2c_read(client, GOODIX_REG_ID, 997 &test, 1); 998 if (!error) 999 return 0; 1000 1001 dev_err(&client->dev, "i2c test failed attempt %d: %d\n", 1002 retry, error); 1003 msleep(20); 1004 } 1005 1006 return error; 1007 } 1008 1009 /** 1010 * goodix_configure_dev - Finish device initialization 1011 * 1012 * @ts: our goodix_ts_data pointer 1013 * 1014 * Must be called from probe to finish initialization of the device. 1015 * Contains the common initialization code for both devices that 1016 * declare gpio pins and devices that do not. It is either called 1017 * directly from probe or from request_firmware_wait callback. 1018 */ 1019 static int goodix_configure_dev(struct goodix_ts_data *ts) 1020 { 1021 int error; 1022 int i; 1023 1024 ts->int_trigger_type = GOODIX_INT_TRIGGER; 1025 ts->max_touch_num = GOODIX_MAX_CONTACTS; 1026 1027 ts->input_dev = devm_input_allocate_device(&ts->client->dev); 1028 if (!ts->input_dev) { 1029 dev_err(&ts->client->dev, "Failed to allocate input device."); 1030 return -ENOMEM; 1031 } 1032 1033 ts->input_dev->name = "Goodix Capacitive TouchScreen"; 1034 ts->input_dev->phys = "input/ts"; 1035 ts->input_dev->id.bustype = BUS_I2C; 1036 ts->input_dev->id.vendor = 0x0416; 1037 if (kstrtou16(ts->id, 10, &ts->input_dev->id.product)) 1038 ts->input_dev->id.product = 0x1001; 1039 ts->input_dev->id.version = ts->version; 1040 1041 ts->input_dev->keycode = ts->keymap; 1042 ts->input_dev->keycodesize = sizeof(ts->keymap[0]); 1043 ts->input_dev->keycodemax = GOODIX_MAX_KEYS; 1044 1045 /* Capacitive Windows/Home button on some devices */ 1046 for (i = 0; i < GOODIX_MAX_KEYS; ++i) { 1047 if (i == 0) 1048 ts->keymap[i] = KEY_LEFTMETA; 1049 else 1050 ts->keymap[i] = KEY_F1 + (i - 1); 1051 1052 input_set_capability(ts->input_dev, EV_KEY, ts->keymap[i]); 1053 } 1054 1055 input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_X); 1056 input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_Y); 1057 input_set_abs_params(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0); 1058 input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); 1059 1060 /* Read configuration and apply touchscreen parameters */ 1061 goodix_read_config(ts); 1062 1063 /* Try overriding touchscreen parameters via device properties */ 1064 touchscreen_parse_properties(ts->input_dev, true, &ts->prop); 1065 1066 if (!ts->prop.max_x || !ts->prop.max_y || !ts->max_touch_num) { 1067 dev_err(&ts->client->dev, 1068 "Invalid config (%d, %d, %d), using defaults\n", 1069 ts->prop.max_x, ts->prop.max_y, ts->max_touch_num); 1070 ts->prop.max_x = GOODIX_MAX_WIDTH - 1; 1071 ts->prop.max_y = GOODIX_MAX_HEIGHT - 1; 1072 ts->max_touch_num = GOODIX_MAX_CONTACTS; 1073 input_abs_set_max(ts->input_dev, 1074 ABS_MT_POSITION_X, ts->prop.max_x); 1075 input_abs_set_max(ts->input_dev, 1076 ABS_MT_POSITION_Y, ts->prop.max_y); 1077 } 1078 1079 if (dmi_check_system(nine_bytes_report)) { 1080 ts->contact_size = 9; 1081 1082 dev_dbg(&ts->client->dev, 1083 "Non-standard 9-bytes report format quirk\n"); 1084 } 1085 1086 if (dmi_check_system(inverted_x_screen)) { 1087 ts->prop.invert_x = true; 1088 dev_dbg(&ts->client->dev, 1089 "Applying 'inverted x screen' quirk\n"); 1090 } 1091 1092 error = input_mt_init_slots(ts->input_dev, ts->max_touch_num, 1093 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); 1094 if (error) { 1095 dev_err(&ts->client->dev, 1096 "Failed to initialize MT slots: %d", error); 1097 return error; 1098 } 1099 1100 error = input_register_device(ts->input_dev); 1101 if (error) { 1102 dev_err(&ts->client->dev, 1103 "Failed to register input device: %d", error); 1104 return error; 1105 } 1106 1107 ts->irq_flags = goodix_irq_flags[ts->int_trigger_type] | IRQF_ONESHOT; 1108 error = goodix_request_irq(ts); 1109 if (error) { 1110 dev_err(&ts->client->dev, "request IRQ failed: %d\n", error); 1111 return error; 1112 } 1113 1114 return 0; 1115 } 1116 1117 /** 1118 * goodix_config_cb - Callback to finish device init 1119 * 1120 * @ts: our goodix_ts_data pointer 1121 * 1122 * request_firmware_wait callback that finishes 1123 * initialization of the device. 1124 */ 1125 static void goodix_config_cb(const struct firmware *cfg, void *ctx) 1126 { 1127 struct goodix_ts_data *ts = ctx; 1128 int error; 1129 1130 if (cfg) { 1131 /* send device configuration to the firmware */ 1132 error = goodix_send_cfg(ts, cfg->data, cfg->size); 1133 if (error) 1134 goto err_release_cfg; 1135 } 1136 1137 goodix_configure_dev(ts); 1138 1139 err_release_cfg: 1140 release_firmware(cfg); 1141 complete_all(&ts->firmware_loading_complete); 1142 } 1143 1144 static void goodix_disable_regulators(void *arg) 1145 { 1146 struct goodix_ts_data *ts = arg; 1147 1148 regulator_disable(ts->vddio); 1149 regulator_disable(ts->avdd28); 1150 } 1151 1152 static int goodix_ts_probe(struct i2c_client *client, 1153 const struct i2c_device_id *id) 1154 { 1155 struct goodix_ts_data *ts; 1156 int error; 1157 1158 dev_dbg(&client->dev, "I2C Address: 0x%02x\n", client->addr); 1159 1160 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { 1161 dev_err(&client->dev, "I2C check functionality failed.\n"); 1162 return -ENXIO; 1163 } 1164 1165 ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL); 1166 if (!ts) 1167 return -ENOMEM; 1168 1169 ts->client = client; 1170 i2c_set_clientdata(client, ts); 1171 init_completion(&ts->firmware_loading_complete); 1172 ts->contact_size = GOODIX_CONTACT_SIZE; 1173 1174 error = goodix_get_gpio_config(ts); 1175 if (error) 1176 return error; 1177 1178 /* power up the controller */ 1179 error = regulator_enable(ts->avdd28); 1180 if (error) { 1181 dev_err(&client->dev, 1182 "Failed to enable AVDD28 regulator: %d\n", 1183 error); 1184 return error; 1185 } 1186 1187 error = regulator_enable(ts->vddio); 1188 if (error) { 1189 dev_err(&client->dev, 1190 "Failed to enable VDDIO regulator: %d\n", 1191 error); 1192 regulator_disable(ts->avdd28); 1193 return error; 1194 } 1195 1196 error = devm_add_action_or_reset(&client->dev, 1197 goodix_disable_regulators, ts); 1198 if (error) 1199 return error; 1200 1201 reset: 1202 if (ts->reset_controller_at_probe) { 1203 /* reset the controller */ 1204 error = goodix_reset(ts); 1205 if (error) { 1206 dev_err(&client->dev, "Controller reset failed.\n"); 1207 return error; 1208 } 1209 } 1210 1211 error = goodix_i2c_test(client); 1212 if (error) { 1213 if (!ts->reset_controller_at_probe && 1214 ts->irq_pin_access_method != IRQ_PIN_ACCESS_NONE) { 1215 /* Retry after a controller reset */ 1216 ts->reset_controller_at_probe = true; 1217 goto reset; 1218 } 1219 dev_err(&client->dev, "I2C communication failure: %d\n", error); 1220 return error; 1221 } 1222 1223 error = goodix_read_version(ts); 1224 if (error) { 1225 dev_err(&client->dev, "Read version failed.\n"); 1226 return error; 1227 } 1228 1229 ts->chip = goodix_get_chip_data(ts->id); 1230 1231 if (ts->load_cfg_from_disk) { 1232 /* update device config */ 1233 ts->cfg_name = devm_kasprintf(&client->dev, GFP_KERNEL, 1234 "goodix_%s_cfg.bin", ts->id); 1235 if (!ts->cfg_name) 1236 return -ENOMEM; 1237 1238 error = request_firmware_nowait(THIS_MODULE, true, ts->cfg_name, 1239 &client->dev, GFP_KERNEL, ts, 1240 goodix_config_cb); 1241 if (error) { 1242 dev_err(&client->dev, 1243 "Failed to invoke firmware loader: %d\n", 1244 error); 1245 return error; 1246 } 1247 1248 return 0; 1249 } else { 1250 error = goodix_configure_dev(ts); 1251 if (error) 1252 return error; 1253 } 1254 1255 return 0; 1256 } 1257 1258 static int goodix_ts_remove(struct i2c_client *client) 1259 { 1260 struct goodix_ts_data *ts = i2c_get_clientdata(client); 1261 1262 if (ts->load_cfg_from_disk) 1263 wait_for_completion(&ts->firmware_loading_complete); 1264 1265 return 0; 1266 } 1267 1268 static int __maybe_unused goodix_suspend(struct device *dev) 1269 { 1270 struct i2c_client *client = to_i2c_client(dev); 1271 struct goodix_ts_data *ts = i2c_get_clientdata(client); 1272 int error; 1273 1274 if (ts->load_cfg_from_disk) 1275 wait_for_completion(&ts->firmware_loading_complete); 1276 1277 /* We need gpio pins to suspend/resume */ 1278 if (ts->irq_pin_access_method == IRQ_PIN_ACCESS_NONE) { 1279 disable_irq(client->irq); 1280 return 0; 1281 } 1282 1283 /* Free IRQ as IRQ pin is used as output in the suspend sequence */ 1284 goodix_free_irq(ts); 1285 1286 /* Output LOW on the INT pin for 5 ms */ 1287 error = goodix_irq_direction_output(ts, 0); 1288 if (error) { 1289 goodix_request_irq(ts); 1290 return error; 1291 } 1292 1293 usleep_range(5000, 6000); 1294 1295 error = goodix_i2c_write_u8(ts->client, GOODIX_REG_COMMAND, 1296 GOODIX_CMD_SCREEN_OFF); 1297 if (error) { 1298 dev_err(&ts->client->dev, "Screen off command failed\n"); 1299 goodix_irq_direction_input(ts); 1300 goodix_request_irq(ts); 1301 return -EAGAIN; 1302 } 1303 1304 /* 1305 * The datasheet specifies that the interval between sending screen-off 1306 * command and wake-up should be longer than 58 ms. To avoid waking up 1307 * sooner, delay 58ms here. 1308 */ 1309 msleep(58); 1310 return 0; 1311 } 1312 1313 static int __maybe_unused goodix_resume(struct device *dev) 1314 { 1315 struct i2c_client *client = to_i2c_client(dev); 1316 struct goodix_ts_data *ts = i2c_get_clientdata(client); 1317 u8 config_ver; 1318 int error; 1319 1320 if (ts->irq_pin_access_method == IRQ_PIN_ACCESS_NONE) { 1321 enable_irq(client->irq); 1322 return 0; 1323 } 1324 1325 /* 1326 * Exit sleep mode by outputting HIGH level to INT pin 1327 * for 2ms~5ms. 1328 */ 1329 error = goodix_irq_direction_output(ts, 1); 1330 if (error) 1331 return error; 1332 1333 usleep_range(2000, 5000); 1334 1335 error = goodix_int_sync(ts); 1336 if (error) 1337 return error; 1338 1339 error = goodix_i2c_read(ts->client, ts->chip->config_addr, 1340 &config_ver, 1); 1341 if (error) 1342 dev_warn(dev, "Error reading config version: %d, resetting controller\n", 1343 error); 1344 else if (config_ver != ts->config[0]) 1345 dev_info(dev, "Config version mismatch %d != %d, resetting controller\n", 1346 config_ver, ts->config[0]); 1347 1348 if (error != 0 || config_ver != ts->config[0]) { 1349 error = goodix_reset(ts); 1350 if (error) { 1351 dev_err(dev, "Controller reset failed.\n"); 1352 return error; 1353 } 1354 1355 error = goodix_send_cfg(ts, ts->config, ts->chip->config_len); 1356 if (error) 1357 return error; 1358 } 1359 1360 error = goodix_request_irq(ts); 1361 if (error) 1362 return error; 1363 1364 return 0; 1365 } 1366 1367 static SIMPLE_DEV_PM_OPS(goodix_pm_ops, goodix_suspend, goodix_resume); 1368 1369 static const struct i2c_device_id goodix_ts_id[] = { 1370 { "GDIX1001:00", 0 }, 1371 { } 1372 }; 1373 MODULE_DEVICE_TABLE(i2c, goodix_ts_id); 1374 1375 #ifdef CONFIG_ACPI 1376 static const struct acpi_device_id goodix_acpi_match[] = { 1377 { "GDIX1001", 0 }, 1378 { "GDIX1002", 0 }, 1379 { } 1380 }; 1381 MODULE_DEVICE_TABLE(acpi, goodix_acpi_match); 1382 #endif 1383 1384 #ifdef CONFIG_OF 1385 static const struct of_device_id goodix_of_match[] = { 1386 { .compatible = "goodix,gt1151" }, 1387 { .compatible = "goodix,gt5663" }, 1388 { .compatible = "goodix,gt5688" }, 1389 { .compatible = "goodix,gt911" }, 1390 { .compatible = "goodix,gt9110" }, 1391 { .compatible = "goodix,gt912" }, 1392 { .compatible = "goodix,gt9147" }, 1393 { .compatible = "goodix,gt917s" }, 1394 { .compatible = "goodix,gt927" }, 1395 { .compatible = "goodix,gt9271" }, 1396 { .compatible = "goodix,gt928" }, 1397 { .compatible = "goodix,gt9286" }, 1398 { .compatible = "goodix,gt967" }, 1399 { } 1400 }; 1401 MODULE_DEVICE_TABLE(of, goodix_of_match); 1402 #endif 1403 1404 static struct i2c_driver goodix_ts_driver = { 1405 .probe = goodix_ts_probe, 1406 .remove = goodix_ts_remove, 1407 .id_table = goodix_ts_id, 1408 .driver = { 1409 .name = "Goodix-TS", 1410 .acpi_match_table = ACPI_PTR(goodix_acpi_match), 1411 .of_match_table = of_match_ptr(goodix_of_match), 1412 .pm = &goodix_pm_ops, 1413 }, 1414 }; 1415 module_i2c_driver(goodix_ts_driver); 1416 1417 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>"); 1418 MODULE_AUTHOR("Bastien Nocera <hadess@hadess.net>"); 1419 MODULE_DESCRIPTION("Goodix touchscreen driver"); 1420 MODULE_LICENSE("GPL v2"); 1421