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/module.h> 18 #include <linux/delay.h> 19 #include <linux/irq.h> 20 #include <linux/interrupt.h> 21 #include <linux/platform_data/x86/soc.h> 22 #include <linux/slab.h> 23 #include <linux/acpi.h> 24 #include <linux/of.h> 25 #include <asm/unaligned.h> 26 #include "goodix.h" 27 28 #define GOODIX_GPIO_INT_NAME "irq" 29 #define GOODIX_GPIO_RST_NAME "reset" 30 31 #define GOODIX_MAX_HEIGHT 4096 32 #define GOODIX_MAX_WIDTH 4096 33 #define GOODIX_INT_TRIGGER 1 34 #define GOODIX_CONTACT_SIZE 8 35 #define GOODIX_MAX_CONTACT_SIZE 9 36 #define GOODIX_MAX_CONTACTS 10 37 38 #define GOODIX_CONFIG_MIN_LENGTH 186 39 #define GOODIX_CONFIG_911_LENGTH 186 40 #define GOODIX_CONFIG_967_LENGTH 228 41 #define GOODIX_CONFIG_GT9X_LENGTH 240 42 43 #define GOODIX_BUFFER_STATUS_READY BIT(7) 44 #define GOODIX_HAVE_KEY BIT(4) 45 #define GOODIX_BUFFER_STATUS_TIMEOUT 20 46 47 #define RESOLUTION_LOC 1 48 #define MAX_CONTACTS_LOC 5 49 #define TRIGGER_LOC 6 50 51 /* Our special handling for GPIO accesses through ACPI is x86 specific */ 52 #if defined CONFIG_X86 && defined CONFIG_ACPI 53 #define ACPI_GPIO_SUPPORT 54 #endif 55 56 struct goodix_chip_id { 57 const char *id; 58 const struct goodix_chip_data *data; 59 }; 60 61 static int goodix_check_cfg_8(struct goodix_ts_data *ts, 62 const u8 *cfg, int len); 63 static int goodix_check_cfg_16(struct goodix_ts_data *ts, 64 const u8 *cfg, int len); 65 static void goodix_calc_cfg_checksum_8(struct goodix_ts_data *ts); 66 static void goodix_calc_cfg_checksum_16(struct goodix_ts_data *ts); 67 68 static const struct goodix_chip_data gt1x_chip_data = { 69 .config_addr = GOODIX_GT1X_REG_CONFIG_DATA, 70 .config_len = GOODIX_CONFIG_GT9X_LENGTH, 71 .check_config = goodix_check_cfg_16, 72 .calc_config_checksum = goodix_calc_cfg_checksum_16, 73 }; 74 75 static const struct goodix_chip_data gt911_chip_data = { 76 .config_addr = GOODIX_GT9X_REG_CONFIG_DATA, 77 .config_len = GOODIX_CONFIG_911_LENGTH, 78 .check_config = goodix_check_cfg_8, 79 .calc_config_checksum = goodix_calc_cfg_checksum_8, 80 }; 81 82 static const struct goodix_chip_data gt967_chip_data = { 83 .config_addr = GOODIX_GT9X_REG_CONFIG_DATA, 84 .config_len = GOODIX_CONFIG_967_LENGTH, 85 .check_config = goodix_check_cfg_8, 86 .calc_config_checksum = goodix_calc_cfg_checksum_8, 87 }; 88 89 static const struct goodix_chip_data gt9x_chip_data = { 90 .config_addr = GOODIX_GT9X_REG_CONFIG_DATA, 91 .config_len = GOODIX_CONFIG_GT9X_LENGTH, 92 .check_config = goodix_check_cfg_8, 93 .calc_config_checksum = goodix_calc_cfg_checksum_8, 94 }; 95 96 static const struct goodix_chip_id goodix_chip_ids[] = { 97 { .id = "1151", .data = >1x_chip_data }, 98 { .id = "1158", .data = >1x_chip_data }, 99 { .id = "5663", .data = >1x_chip_data }, 100 { .id = "5688", .data = >1x_chip_data }, 101 { .id = "917S", .data = >1x_chip_data }, 102 { .id = "9286", .data = >1x_chip_data }, 103 104 { .id = "911", .data = >911_chip_data }, 105 { .id = "9271", .data = >911_chip_data }, 106 { .id = "9110", .data = >911_chip_data }, 107 { .id = "9111", .data = >911_chip_data }, 108 { .id = "927", .data = >911_chip_data }, 109 { .id = "928", .data = >911_chip_data }, 110 111 { .id = "912", .data = >967_chip_data }, 112 { .id = "9147", .data = >967_chip_data }, 113 { .id = "967", .data = >967_chip_data }, 114 { } 115 }; 116 117 static const unsigned long goodix_irq_flags[] = { 118 IRQ_TYPE_EDGE_RISING, 119 IRQ_TYPE_EDGE_FALLING, 120 IRQ_TYPE_LEVEL_LOW, 121 IRQ_TYPE_LEVEL_HIGH, 122 }; 123 124 static const struct dmi_system_id nine_bytes_report[] = { 125 #if defined(CONFIG_DMI) && defined(CONFIG_X86) 126 { 127 .ident = "Lenovo YogaBook", 128 /* YB1-X91L/F and YB1-X90L/F */ 129 .matches = { 130 DMI_MATCH(DMI_PRODUCT_NAME, "Lenovo YB1-X9") 131 } 132 }, 133 #endif 134 {} 135 }; 136 137 /* 138 * Those tablets have their x coordinate inverted 139 */ 140 static const struct dmi_system_id inverted_x_screen[] = { 141 #if defined(CONFIG_DMI) && defined(CONFIG_X86) 142 { 143 .ident = "Cube I15-TC", 144 .matches = { 145 DMI_MATCH(DMI_SYS_VENDOR, "Cube"), 146 DMI_MATCH(DMI_PRODUCT_NAME, "I15-TC") 147 }, 148 }, 149 #endif 150 {} 151 }; 152 153 /** 154 * goodix_i2c_read - read data from a register of the i2c slave device. 155 * 156 * @client: i2c device. 157 * @reg: the register to read from. 158 * @buf: raw write data buffer. 159 * @len: length of the buffer to write 160 */ 161 int goodix_i2c_read(struct i2c_client *client, u16 reg, u8 *buf, int len) 162 { 163 struct i2c_msg msgs[2]; 164 __be16 wbuf = cpu_to_be16(reg); 165 int ret; 166 167 msgs[0].flags = 0; 168 msgs[0].addr = client->addr; 169 msgs[0].len = 2; 170 msgs[0].buf = (u8 *)&wbuf; 171 172 msgs[1].flags = I2C_M_RD; 173 msgs[1].addr = client->addr; 174 msgs[1].len = len; 175 msgs[1].buf = buf; 176 177 ret = i2c_transfer(client->adapter, msgs, 2); 178 if (ret >= 0) 179 ret = (ret == ARRAY_SIZE(msgs) ? 0 : -EIO); 180 181 if (ret) 182 dev_err(&client->dev, "Error reading %d bytes from 0x%04x: %d\n", 183 len, reg, ret); 184 return ret; 185 } 186 187 /** 188 * goodix_i2c_write - write data to a register of the i2c slave device. 189 * 190 * @client: i2c device. 191 * @reg: the register to write to. 192 * @buf: raw data buffer to write. 193 * @len: length of the buffer to write 194 */ 195 int goodix_i2c_write(struct i2c_client *client, u16 reg, const u8 *buf, int len) 196 { 197 u8 *addr_buf; 198 struct i2c_msg msg; 199 int ret; 200 201 addr_buf = kmalloc(len + 2, GFP_KERNEL); 202 if (!addr_buf) 203 return -ENOMEM; 204 205 addr_buf[0] = reg >> 8; 206 addr_buf[1] = reg & 0xFF; 207 memcpy(&addr_buf[2], buf, len); 208 209 msg.flags = 0; 210 msg.addr = client->addr; 211 msg.buf = addr_buf; 212 msg.len = len + 2; 213 214 ret = i2c_transfer(client->adapter, &msg, 1); 215 if (ret >= 0) 216 ret = (ret == 1 ? 0 : -EIO); 217 218 kfree(addr_buf); 219 220 if (ret) 221 dev_err(&client->dev, "Error writing %d bytes to 0x%04x: %d\n", 222 len, reg, ret); 223 return ret; 224 } 225 226 int goodix_i2c_write_u8(struct i2c_client *client, u16 reg, u8 value) 227 { 228 return goodix_i2c_write(client, reg, &value, sizeof(value)); 229 } 230 231 static const struct goodix_chip_data *goodix_get_chip_data(const char *id) 232 { 233 unsigned int i; 234 235 for (i = 0; goodix_chip_ids[i].id; i++) { 236 if (!strcmp(goodix_chip_ids[i].id, id)) 237 return goodix_chip_ids[i].data; 238 } 239 240 return >9x_chip_data; 241 } 242 243 static int goodix_ts_read_input_report(struct goodix_ts_data *ts, u8 *data) 244 { 245 unsigned long max_timeout; 246 int touch_num; 247 int error; 248 u16 addr = GOODIX_READ_COOR_ADDR; 249 /* 250 * We are going to read 1-byte header, 251 * ts->contact_size * max(1, touch_num) bytes of coordinates 252 * and 1-byte footer which contains the touch-key code. 253 */ 254 const int header_contact_keycode_size = 1 + ts->contact_size + 1; 255 256 /* 257 * The 'buffer status' bit, which indicates that the data is valid, is 258 * not set as soon as the interrupt is raised, but slightly after. 259 * This takes around 10 ms to happen, so we poll for 20 ms. 260 */ 261 max_timeout = jiffies + msecs_to_jiffies(GOODIX_BUFFER_STATUS_TIMEOUT); 262 do { 263 error = goodix_i2c_read(ts->client, addr, data, 264 header_contact_keycode_size); 265 if (error) 266 return error; 267 268 if (data[0] & GOODIX_BUFFER_STATUS_READY) { 269 touch_num = data[0] & 0x0f; 270 if (touch_num > ts->max_touch_num) 271 return -EPROTO; 272 273 if (touch_num > 1) { 274 addr += header_contact_keycode_size; 275 data += header_contact_keycode_size; 276 error = goodix_i2c_read(ts->client, 277 addr, data, 278 ts->contact_size * 279 (touch_num - 1)); 280 if (error) 281 return error; 282 } 283 284 return touch_num; 285 } 286 287 if (data[0] == 0 && ts->firmware_name) { 288 if (goodix_handle_fw_request(ts)) 289 return 0; 290 } 291 292 usleep_range(1000, 2000); /* Poll every 1 - 2 ms */ 293 } while (time_before(jiffies, max_timeout)); 294 295 /* 296 * The Goodix panel will send spurious interrupts after a 297 * 'finger up' event, which will always cause a timeout. 298 */ 299 return -ENOMSG; 300 } 301 302 static int goodix_create_pen_input(struct goodix_ts_data *ts) 303 { 304 struct device *dev = &ts->client->dev; 305 struct input_dev *input; 306 307 input = devm_input_allocate_device(dev); 308 if (!input) 309 return -ENOMEM; 310 311 input_copy_abs(input, ABS_X, ts->input_dev, ABS_MT_POSITION_X); 312 input_copy_abs(input, ABS_Y, ts->input_dev, ABS_MT_POSITION_Y); 313 /* 314 * The resolution of these touchscreens is about 10 units/mm, the actual 315 * resolution does not matter much since we set INPUT_PROP_DIRECT. 316 * Userspace wants something here though, so just set it to 10 units/mm. 317 */ 318 input_abs_set_res(input, ABS_X, 10); 319 input_abs_set_res(input, ABS_Y, 10); 320 input_set_abs_params(input, ABS_PRESSURE, 0, 255, 0, 0); 321 322 input_set_capability(input, EV_KEY, BTN_TOUCH); 323 input_set_capability(input, EV_KEY, BTN_TOOL_PEN); 324 input_set_capability(input, EV_KEY, BTN_STYLUS); 325 input_set_capability(input, EV_KEY, BTN_STYLUS2); 326 __set_bit(INPUT_PROP_DIRECT, input->propbit); 327 328 input->name = "Goodix Active Pen"; 329 input->phys = "input/pen"; 330 input->id.bustype = BUS_I2C; 331 input->id.vendor = 0x0416; 332 if (kstrtou16(ts->id, 10, &input->id.product)) 333 input->id.product = 0x1001; 334 input->id.version = ts->version; 335 336 ts->input_pen = input; 337 return 0; 338 } 339 340 static void goodix_ts_report_pen_down(struct goodix_ts_data *ts, u8 *data) 341 { 342 int input_x, input_y, input_w, error; 343 u8 key_value; 344 345 if (!ts->pen_input_registered) { 346 error = input_register_device(ts->input_pen); 347 ts->pen_input_registered = (error == 0) ? 1 : error; 348 } 349 350 if (ts->pen_input_registered < 0) 351 return; 352 353 if (ts->contact_size == 9) { 354 input_x = get_unaligned_le16(&data[4]); 355 input_y = get_unaligned_le16(&data[6]); 356 input_w = get_unaligned_le16(&data[8]); 357 } else { 358 input_x = get_unaligned_le16(&data[2]); 359 input_y = get_unaligned_le16(&data[4]); 360 input_w = get_unaligned_le16(&data[6]); 361 } 362 363 touchscreen_report_pos(ts->input_pen, &ts->prop, input_x, input_y, false); 364 input_report_abs(ts->input_pen, ABS_PRESSURE, input_w); 365 366 input_report_key(ts->input_pen, BTN_TOUCH, 1); 367 input_report_key(ts->input_pen, BTN_TOOL_PEN, 1); 368 369 if (data[0] & GOODIX_HAVE_KEY) { 370 key_value = data[1 + ts->contact_size]; 371 input_report_key(ts->input_pen, BTN_STYLUS, key_value & 0x10); 372 input_report_key(ts->input_pen, BTN_STYLUS2, key_value & 0x20); 373 } else { 374 input_report_key(ts->input_pen, BTN_STYLUS, 0); 375 input_report_key(ts->input_pen, BTN_STYLUS2, 0); 376 } 377 378 input_sync(ts->input_pen); 379 } 380 381 static void goodix_ts_report_pen_up(struct goodix_ts_data *ts) 382 { 383 if (!ts->input_pen) 384 return; 385 386 input_report_key(ts->input_pen, BTN_TOUCH, 0); 387 input_report_key(ts->input_pen, BTN_TOOL_PEN, 0); 388 input_report_key(ts->input_pen, BTN_STYLUS, 0); 389 input_report_key(ts->input_pen, BTN_STYLUS2, 0); 390 391 input_sync(ts->input_pen); 392 } 393 394 static void goodix_ts_report_touch_8b(struct goodix_ts_data *ts, u8 *coor_data) 395 { 396 int id = coor_data[0] & 0x0F; 397 int input_x = get_unaligned_le16(&coor_data[1]); 398 int input_y = get_unaligned_le16(&coor_data[3]); 399 int input_w = get_unaligned_le16(&coor_data[5]); 400 401 input_mt_slot(ts->input_dev, id); 402 input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true); 403 touchscreen_report_pos(ts->input_dev, &ts->prop, 404 input_x, input_y, true); 405 input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, input_w); 406 input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w); 407 } 408 409 static void goodix_ts_report_touch_9b(struct goodix_ts_data *ts, u8 *coor_data) 410 { 411 int id = coor_data[1] & 0x0F; 412 int input_x = get_unaligned_le16(&coor_data[3]); 413 int input_y = get_unaligned_le16(&coor_data[5]); 414 int input_w = get_unaligned_le16(&coor_data[7]); 415 416 input_mt_slot(ts->input_dev, id); 417 input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true); 418 touchscreen_report_pos(ts->input_dev, &ts->prop, 419 input_x, input_y, true); 420 input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, input_w); 421 input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w); 422 } 423 424 static void goodix_ts_release_keys(struct goodix_ts_data *ts) 425 { 426 int i; 427 428 for (i = 0; i < GOODIX_MAX_KEYS; i++) 429 input_report_key(ts->input_dev, ts->keymap[i], 0); 430 } 431 432 static void goodix_ts_report_key(struct goodix_ts_data *ts, u8 *data) 433 { 434 int touch_num; 435 u8 key_value; 436 int i; 437 438 if (data[0] & GOODIX_HAVE_KEY) { 439 touch_num = data[0] & 0x0f; 440 key_value = data[1 + ts->contact_size * touch_num]; 441 for (i = 0; i < GOODIX_MAX_KEYS; i++) 442 if (key_value & BIT(i)) 443 input_report_key(ts->input_dev, 444 ts->keymap[i], 1); 445 } else { 446 goodix_ts_release_keys(ts); 447 } 448 } 449 450 /** 451 * goodix_process_events - Process incoming events 452 * 453 * @ts: our goodix_ts_data pointer 454 * 455 * Called when the IRQ is triggered. Read the current device state, and push 456 * the input events to the user space. 457 */ 458 static void goodix_process_events(struct goodix_ts_data *ts) 459 { 460 u8 point_data[2 + GOODIX_MAX_CONTACT_SIZE * GOODIX_MAX_CONTACTS]; 461 int touch_num; 462 int i; 463 464 touch_num = goodix_ts_read_input_report(ts, point_data); 465 if (touch_num < 0) 466 return; 467 468 /* The pen being down is always reported as a single touch */ 469 if (touch_num == 1 && (point_data[1] & 0x80)) { 470 goodix_ts_report_pen_down(ts, point_data); 471 goodix_ts_release_keys(ts); 472 goto sync; /* Release any previously registered touches */ 473 } else { 474 goodix_ts_report_pen_up(ts); 475 } 476 477 goodix_ts_report_key(ts, point_data); 478 479 for (i = 0; i < touch_num; i++) 480 if (ts->contact_size == 9) 481 goodix_ts_report_touch_9b(ts, 482 &point_data[1 + ts->contact_size * i]); 483 else 484 goodix_ts_report_touch_8b(ts, 485 &point_data[1 + ts->contact_size * i]); 486 487 sync: 488 input_mt_sync_frame(ts->input_dev); 489 input_sync(ts->input_dev); 490 } 491 492 /** 493 * goodix_ts_irq_handler - The IRQ handler 494 * 495 * @irq: interrupt number. 496 * @dev_id: private data pointer. 497 */ 498 static irqreturn_t goodix_ts_irq_handler(int irq, void *dev_id) 499 { 500 struct goodix_ts_data *ts = dev_id; 501 502 goodix_process_events(ts); 503 goodix_i2c_write_u8(ts->client, GOODIX_READ_COOR_ADDR, 0); 504 505 return IRQ_HANDLED; 506 } 507 508 static void goodix_free_irq(struct goodix_ts_data *ts) 509 { 510 devm_free_irq(&ts->client->dev, ts->client->irq, ts); 511 } 512 513 static int goodix_request_irq(struct goodix_ts_data *ts) 514 { 515 return devm_request_threaded_irq(&ts->client->dev, ts->client->irq, 516 NULL, goodix_ts_irq_handler, 517 ts->irq_flags, ts->client->name, ts); 518 } 519 520 static int goodix_check_cfg_8(struct goodix_ts_data *ts, const u8 *cfg, int len) 521 { 522 int i, raw_cfg_len = len - 2; 523 u8 check_sum = 0; 524 525 for (i = 0; i < raw_cfg_len; i++) 526 check_sum += cfg[i]; 527 check_sum = (~check_sum) + 1; 528 if (check_sum != cfg[raw_cfg_len]) { 529 dev_err(&ts->client->dev, 530 "The checksum of the config fw is not correct"); 531 return -EINVAL; 532 } 533 534 if (cfg[raw_cfg_len + 1] != 1) { 535 dev_err(&ts->client->dev, 536 "Config fw must have Config_Fresh register set"); 537 return -EINVAL; 538 } 539 540 return 0; 541 } 542 543 static void goodix_calc_cfg_checksum_8(struct goodix_ts_data *ts) 544 { 545 int i, raw_cfg_len = ts->chip->config_len - 2; 546 u8 check_sum = 0; 547 548 for (i = 0; i < raw_cfg_len; i++) 549 check_sum += ts->config[i]; 550 check_sum = (~check_sum) + 1; 551 552 ts->config[raw_cfg_len] = check_sum; 553 ts->config[raw_cfg_len + 1] = 1; /* Set "config_fresh" bit */ 554 } 555 556 static int goodix_check_cfg_16(struct goodix_ts_data *ts, const u8 *cfg, 557 int len) 558 { 559 int i, raw_cfg_len = len - 3; 560 u16 check_sum = 0; 561 562 for (i = 0; i < raw_cfg_len; i += 2) 563 check_sum += get_unaligned_be16(&cfg[i]); 564 check_sum = (~check_sum) + 1; 565 if (check_sum != get_unaligned_be16(&cfg[raw_cfg_len])) { 566 dev_err(&ts->client->dev, 567 "The checksum of the config fw is not correct"); 568 return -EINVAL; 569 } 570 571 if (cfg[raw_cfg_len + 2] != 1) { 572 dev_err(&ts->client->dev, 573 "Config fw must have Config_Fresh register set"); 574 return -EINVAL; 575 } 576 577 return 0; 578 } 579 580 static void goodix_calc_cfg_checksum_16(struct goodix_ts_data *ts) 581 { 582 int i, raw_cfg_len = ts->chip->config_len - 3; 583 u16 check_sum = 0; 584 585 for (i = 0; i < raw_cfg_len; i += 2) 586 check_sum += get_unaligned_be16(&ts->config[i]); 587 check_sum = (~check_sum) + 1; 588 589 put_unaligned_be16(check_sum, &ts->config[raw_cfg_len]); 590 ts->config[raw_cfg_len + 2] = 1; /* Set "config_fresh" bit */ 591 } 592 593 /** 594 * goodix_check_cfg - Checks if config fw is valid 595 * 596 * @ts: goodix_ts_data pointer 597 * @cfg: firmware config data 598 * @len: config data length 599 */ 600 static int goodix_check_cfg(struct goodix_ts_data *ts, const u8 *cfg, int len) 601 { 602 if (len < GOODIX_CONFIG_MIN_LENGTH || 603 len > GOODIX_CONFIG_MAX_LENGTH) { 604 dev_err(&ts->client->dev, 605 "The length of the config fw is not correct"); 606 return -EINVAL; 607 } 608 609 return ts->chip->check_config(ts, cfg, len); 610 } 611 612 /** 613 * goodix_send_cfg - Write fw config to device 614 * 615 * @ts: goodix_ts_data pointer 616 * @cfg: config firmware to write to device 617 * @len: config data length 618 */ 619 int goodix_send_cfg(struct goodix_ts_data *ts, const u8 *cfg, int len) 620 { 621 int error; 622 623 error = goodix_check_cfg(ts, cfg, len); 624 if (error) 625 return error; 626 627 error = goodix_i2c_write(ts->client, ts->chip->config_addr, cfg, len); 628 if (error) 629 return error; 630 631 dev_dbg(&ts->client->dev, "Config sent successfully."); 632 633 /* Let the firmware reconfigure itself, so sleep for 10ms */ 634 usleep_range(10000, 11000); 635 636 return 0; 637 } 638 639 #ifdef ACPI_GPIO_SUPPORT 640 static int goodix_pin_acpi_direction_input(struct goodix_ts_data *ts) 641 { 642 acpi_handle handle = ACPI_HANDLE(&ts->client->dev); 643 acpi_status status; 644 645 status = acpi_evaluate_object(handle, "INTI", NULL, NULL); 646 return ACPI_SUCCESS(status) ? 0 : -EIO; 647 } 648 649 static int goodix_pin_acpi_output_method(struct goodix_ts_data *ts, int value) 650 { 651 acpi_handle handle = ACPI_HANDLE(&ts->client->dev); 652 acpi_status status; 653 654 status = acpi_execute_simple_method(handle, "INTO", value); 655 return ACPI_SUCCESS(status) ? 0 : -EIO; 656 } 657 #else 658 static int goodix_pin_acpi_direction_input(struct goodix_ts_data *ts) 659 { 660 dev_err(&ts->client->dev, 661 "%s called on device without ACPI support\n", __func__); 662 return -EINVAL; 663 } 664 665 static int goodix_pin_acpi_output_method(struct goodix_ts_data *ts, int value) 666 { 667 dev_err(&ts->client->dev, 668 "%s called on device without ACPI support\n", __func__); 669 return -EINVAL; 670 } 671 #endif 672 673 static int goodix_irq_direction_output(struct goodix_ts_data *ts, int value) 674 { 675 switch (ts->irq_pin_access_method) { 676 case IRQ_PIN_ACCESS_NONE: 677 dev_err(&ts->client->dev, 678 "%s called without an irq_pin_access_method set\n", 679 __func__); 680 return -EINVAL; 681 case IRQ_PIN_ACCESS_GPIO: 682 return gpiod_direction_output(ts->gpiod_int, value); 683 case IRQ_PIN_ACCESS_ACPI_GPIO: 684 /* 685 * The IRQ pin triggers on a falling edge, so its gets marked 686 * as active-low, use output_raw to avoid the value inversion. 687 */ 688 return gpiod_direction_output_raw(ts->gpiod_int, value); 689 case IRQ_PIN_ACCESS_ACPI_METHOD: 690 return goodix_pin_acpi_output_method(ts, value); 691 } 692 693 return -EINVAL; /* Never reached */ 694 } 695 696 static int goodix_irq_direction_input(struct goodix_ts_data *ts) 697 { 698 switch (ts->irq_pin_access_method) { 699 case IRQ_PIN_ACCESS_NONE: 700 dev_err(&ts->client->dev, 701 "%s called without an irq_pin_access_method set\n", 702 __func__); 703 return -EINVAL; 704 case IRQ_PIN_ACCESS_GPIO: 705 return gpiod_direction_input(ts->gpiod_int); 706 case IRQ_PIN_ACCESS_ACPI_GPIO: 707 return gpiod_direction_input(ts->gpiod_int); 708 case IRQ_PIN_ACCESS_ACPI_METHOD: 709 return goodix_pin_acpi_direction_input(ts); 710 } 711 712 return -EINVAL; /* Never reached */ 713 } 714 715 int goodix_int_sync(struct goodix_ts_data *ts) 716 { 717 int error; 718 719 error = goodix_irq_direction_output(ts, 0); 720 if (error) 721 goto error; 722 723 msleep(50); /* T5: 50ms */ 724 725 error = goodix_irq_direction_input(ts); 726 if (error) 727 goto error; 728 729 return 0; 730 731 error: 732 dev_err(&ts->client->dev, "Controller irq sync failed.\n"); 733 return error; 734 } 735 736 /** 737 * goodix_reset_no_int_sync - Reset device, leaving interrupt line in output mode 738 * 739 * @ts: goodix_ts_data pointer 740 */ 741 int goodix_reset_no_int_sync(struct goodix_ts_data *ts) 742 { 743 int error; 744 745 /* begin select I2C slave addr */ 746 error = gpiod_direction_output(ts->gpiod_rst, 0); 747 if (error) 748 goto error; 749 750 msleep(20); /* T2: > 10ms */ 751 752 /* HIGH: 0x28/0x29, LOW: 0xBA/0xBB */ 753 error = goodix_irq_direction_output(ts, ts->client->addr == 0x14); 754 if (error) 755 goto error; 756 757 usleep_range(100, 2000); /* T3: > 100us */ 758 759 error = gpiod_direction_output(ts->gpiod_rst, 1); 760 if (error) 761 goto error; 762 763 usleep_range(6000, 10000); /* T4: > 5ms */ 764 765 /* 766 * Put the reset pin back in to input / high-impedance mode to save 767 * power. Only do this in the non ACPI case since some ACPI boards 768 * don't have a pull-up, so there the reset pin must stay active-high. 769 */ 770 if (ts->irq_pin_access_method == IRQ_PIN_ACCESS_GPIO) { 771 error = gpiod_direction_input(ts->gpiod_rst); 772 if (error) 773 goto error; 774 } 775 776 return 0; 777 778 error: 779 dev_err(&ts->client->dev, "Controller reset failed.\n"); 780 return error; 781 } 782 783 /** 784 * goodix_reset - Reset device during power on 785 * 786 * @ts: goodix_ts_data pointer 787 */ 788 static int goodix_reset(struct goodix_ts_data *ts) 789 { 790 int error; 791 792 error = goodix_reset_no_int_sync(ts); 793 if (error) 794 return error; 795 796 return goodix_int_sync(ts); 797 } 798 799 #ifdef ACPI_GPIO_SUPPORT 800 static const struct acpi_gpio_params first_gpio = { 0, 0, false }; 801 static const struct acpi_gpio_params second_gpio = { 1, 0, false }; 802 803 static const struct acpi_gpio_mapping acpi_goodix_int_first_gpios[] = { 804 { GOODIX_GPIO_INT_NAME "-gpios", &first_gpio, 1 }, 805 { GOODIX_GPIO_RST_NAME "-gpios", &second_gpio, 1 }, 806 { }, 807 }; 808 809 static const struct acpi_gpio_mapping acpi_goodix_int_last_gpios[] = { 810 { GOODIX_GPIO_RST_NAME "-gpios", &first_gpio, 1 }, 811 { GOODIX_GPIO_INT_NAME "-gpios", &second_gpio, 1 }, 812 { }, 813 }; 814 815 static const struct acpi_gpio_mapping acpi_goodix_reset_only_gpios[] = { 816 { GOODIX_GPIO_RST_NAME "-gpios", &first_gpio, 1 }, 817 { }, 818 }; 819 820 static int goodix_resource(struct acpi_resource *ares, void *data) 821 { 822 struct goodix_ts_data *ts = data; 823 struct device *dev = &ts->client->dev; 824 struct acpi_resource_gpio *gpio; 825 826 if (acpi_gpio_get_irq_resource(ares, &gpio)) { 827 if (ts->gpio_int_idx == -1) { 828 ts->gpio_int_idx = ts->gpio_count; 829 } else { 830 dev_err(dev, "More then one GpioInt resource, ignoring ACPI GPIO resources\n"); 831 ts->gpio_int_idx = -2; 832 } 833 ts->gpio_count++; 834 } else if (acpi_gpio_get_io_resource(ares, &gpio)) 835 ts->gpio_count++; 836 837 return 0; 838 } 839 840 /* 841 * This function gets called in case we fail to get the irq GPIO directly 842 * because the ACPI tables lack GPIO-name to APCI _CRS index mappings 843 * (no _DSD UUID daffd814-6eba-4d8c-8a91-bc9bbf4aa301 data). 844 * In that case we add our own mapping and then goodix_get_gpio_config() 845 * retries to get the GPIOs based on the added mapping. 846 */ 847 static int goodix_add_acpi_gpio_mappings(struct goodix_ts_data *ts) 848 { 849 const struct acpi_gpio_mapping *gpio_mapping = NULL; 850 struct device *dev = &ts->client->dev; 851 LIST_HEAD(resources); 852 int irq, ret; 853 854 ts->gpio_count = 0; 855 ts->gpio_int_idx = -1; 856 ret = acpi_dev_get_resources(ACPI_COMPANION(dev), &resources, 857 goodix_resource, ts); 858 if (ret < 0) { 859 dev_err(dev, "Error getting ACPI resources: %d\n", ret); 860 return ret; 861 } 862 863 acpi_dev_free_resource_list(&resources); 864 865 /* 866 * CHT devices should have a GpioInt + a regular GPIO ACPI resource. 867 * Some CHT devices have a bug (where the also is bogus Interrupt 868 * resource copied from a previous BYT based generation). i2c-core-acpi 869 * will use the non-working Interrupt resource, fix this up. 870 */ 871 if (soc_intel_is_cht() && ts->gpio_count == 2 && ts->gpio_int_idx != -1) { 872 irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0); 873 if (irq > 0 && irq != ts->client->irq) { 874 dev_warn(dev, "Overriding IRQ %d -> %d\n", ts->client->irq, irq); 875 ts->client->irq = irq; 876 } 877 } 878 879 if (ts->gpio_count == 2 && ts->gpio_int_idx == 0) { 880 ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_GPIO; 881 gpio_mapping = acpi_goodix_int_first_gpios; 882 } else if (ts->gpio_count == 2 && ts->gpio_int_idx == 1) { 883 ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_GPIO; 884 gpio_mapping = acpi_goodix_int_last_gpios; 885 } else if (ts->gpio_count == 1 && ts->gpio_int_idx == -1 && 886 acpi_has_method(ACPI_HANDLE(dev), "INTI") && 887 acpi_has_method(ACPI_HANDLE(dev), "INTO")) { 888 dev_info(dev, "Using ACPI INTI and INTO methods for IRQ pin access\n"); 889 ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_METHOD; 890 gpio_mapping = acpi_goodix_reset_only_gpios; 891 } else if (soc_intel_is_byt() && ts->gpio_count == 2 && ts->gpio_int_idx == -1) { 892 dev_info(dev, "No ACPI GpioInt resource, assuming that the GPIO order is reset, int\n"); 893 ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_GPIO; 894 gpio_mapping = acpi_goodix_int_last_gpios; 895 } else { 896 dev_warn(dev, "Unexpected ACPI resources: gpio_count %d, gpio_int_idx %d\n", 897 ts->gpio_count, ts->gpio_int_idx); 898 /* 899 * On some devices _PS0 does a reset for us and 900 * sometimes this is necessary for things to work. 901 */ 902 acpi_device_fix_up_power(ACPI_COMPANION(dev)); 903 return -EINVAL; 904 } 905 906 /* 907 * Normally we put the reset pin in input / high-impedance mode to save 908 * power. But some x86/ACPI boards don't have a pull-up, so for the ACPI 909 * case, leave the pin as is. This results in the pin not being touched 910 * at all on x86/ACPI boards, except when needed for error-recover. 911 */ 912 ts->gpiod_rst_flags = GPIOD_ASIS; 913 914 return devm_acpi_dev_add_driver_gpios(dev, gpio_mapping); 915 } 916 #else 917 static int goodix_add_acpi_gpio_mappings(struct goodix_ts_data *ts) 918 { 919 return -EINVAL; 920 } 921 #endif /* CONFIG_X86 && CONFIG_ACPI */ 922 923 /** 924 * goodix_get_gpio_config - Get GPIO config from ACPI/DT 925 * 926 * @ts: goodix_ts_data pointer 927 */ 928 static int goodix_get_gpio_config(struct goodix_ts_data *ts) 929 { 930 int error; 931 struct device *dev; 932 struct gpio_desc *gpiod; 933 bool added_acpi_mappings = false; 934 935 if (!ts->client) 936 return -EINVAL; 937 dev = &ts->client->dev; 938 939 /* 940 * By default we request the reset pin as input, leaving it in 941 * high-impedance when not resetting the controller to save power. 942 */ 943 ts->gpiod_rst_flags = GPIOD_IN; 944 945 ts->avdd28 = devm_regulator_get(dev, "AVDD28"); 946 if (IS_ERR(ts->avdd28)) { 947 error = PTR_ERR(ts->avdd28); 948 if (error != -EPROBE_DEFER) 949 dev_err(dev, 950 "Failed to get AVDD28 regulator: %d\n", error); 951 return error; 952 } 953 954 ts->vddio = devm_regulator_get(dev, "VDDIO"); 955 if (IS_ERR(ts->vddio)) { 956 error = PTR_ERR(ts->vddio); 957 if (error != -EPROBE_DEFER) 958 dev_err(dev, 959 "Failed to get VDDIO regulator: %d\n", error); 960 return error; 961 } 962 963 retry_get_irq_gpio: 964 /* Get the interrupt GPIO pin number */ 965 gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_INT_NAME, GPIOD_IN); 966 if (IS_ERR(gpiod)) { 967 error = PTR_ERR(gpiod); 968 if (error != -EPROBE_DEFER) 969 dev_err(dev, "Failed to get %s GPIO: %d\n", 970 GOODIX_GPIO_INT_NAME, error); 971 return error; 972 } 973 if (!gpiod && has_acpi_companion(dev) && !added_acpi_mappings) { 974 added_acpi_mappings = true; 975 if (goodix_add_acpi_gpio_mappings(ts) == 0) 976 goto retry_get_irq_gpio; 977 } 978 979 ts->gpiod_int = gpiod; 980 981 /* Get the reset line GPIO pin number */ 982 gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_RST_NAME, ts->gpiod_rst_flags); 983 if (IS_ERR(gpiod)) { 984 error = PTR_ERR(gpiod); 985 if (error != -EPROBE_DEFER) 986 dev_err(dev, "Failed to get %s GPIO: %d\n", 987 GOODIX_GPIO_RST_NAME, error); 988 return error; 989 } 990 991 ts->gpiod_rst = gpiod; 992 993 switch (ts->irq_pin_access_method) { 994 case IRQ_PIN_ACCESS_ACPI_GPIO: 995 /* 996 * We end up here if goodix_add_acpi_gpio_mappings() has 997 * called devm_acpi_dev_add_driver_gpios() because the ACPI 998 * tables did not contain name to index mappings. 999 * Check that we successfully got both GPIOs after we've 1000 * added our own acpi_gpio_mapping and if we did not get both 1001 * GPIOs reset irq_pin_access_method to IRQ_PIN_ACCESS_NONE. 1002 */ 1003 if (!ts->gpiod_int || !ts->gpiod_rst) 1004 ts->irq_pin_access_method = IRQ_PIN_ACCESS_NONE; 1005 break; 1006 case IRQ_PIN_ACCESS_ACPI_METHOD: 1007 if (!ts->gpiod_rst) 1008 ts->irq_pin_access_method = IRQ_PIN_ACCESS_NONE; 1009 break; 1010 default: 1011 if (ts->gpiod_int && ts->gpiod_rst) { 1012 ts->reset_controller_at_probe = true; 1013 ts->load_cfg_from_disk = true; 1014 ts->irq_pin_access_method = IRQ_PIN_ACCESS_GPIO; 1015 } 1016 } 1017 1018 return 0; 1019 } 1020 1021 /** 1022 * goodix_read_config - Read the embedded configuration of the panel 1023 * 1024 * @ts: our goodix_ts_data pointer 1025 * 1026 * Must be called during probe 1027 */ 1028 static void goodix_read_config(struct goodix_ts_data *ts) 1029 { 1030 int x_max, y_max; 1031 int error; 1032 1033 /* 1034 * On controllers where we need to upload the firmware 1035 * (controllers without flash) ts->config already has the config 1036 * at this point and the controller itself does not have it yet! 1037 */ 1038 if (!ts->firmware_name) { 1039 error = goodix_i2c_read(ts->client, ts->chip->config_addr, 1040 ts->config, ts->chip->config_len); 1041 if (error) { 1042 ts->int_trigger_type = GOODIX_INT_TRIGGER; 1043 ts->max_touch_num = GOODIX_MAX_CONTACTS; 1044 return; 1045 } 1046 } 1047 1048 ts->int_trigger_type = ts->config[TRIGGER_LOC] & 0x03; 1049 ts->max_touch_num = ts->config[MAX_CONTACTS_LOC] & 0x0f; 1050 1051 x_max = get_unaligned_le16(&ts->config[RESOLUTION_LOC]); 1052 y_max = get_unaligned_le16(&ts->config[RESOLUTION_LOC + 2]); 1053 if (x_max && y_max) { 1054 input_abs_set_max(ts->input_dev, ABS_MT_POSITION_X, x_max - 1); 1055 input_abs_set_max(ts->input_dev, ABS_MT_POSITION_Y, y_max - 1); 1056 } 1057 1058 ts->chip->calc_config_checksum(ts); 1059 } 1060 1061 /** 1062 * goodix_read_version - Read goodix touchscreen version 1063 * 1064 * @ts: our goodix_ts_data pointer 1065 */ 1066 static int goodix_read_version(struct goodix_ts_data *ts) 1067 { 1068 int error; 1069 u8 buf[6]; 1070 char id_str[GOODIX_ID_MAX_LEN + 1]; 1071 1072 error = goodix_i2c_read(ts->client, GOODIX_REG_ID, buf, sizeof(buf)); 1073 if (error) 1074 return error; 1075 1076 memcpy(id_str, buf, GOODIX_ID_MAX_LEN); 1077 id_str[GOODIX_ID_MAX_LEN] = 0; 1078 strscpy(ts->id, id_str, GOODIX_ID_MAX_LEN + 1); 1079 1080 ts->version = get_unaligned_le16(&buf[4]); 1081 1082 dev_info(&ts->client->dev, "ID %s, version: %04x\n", ts->id, 1083 ts->version); 1084 1085 return 0; 1086 } 1087 1088 /** 1089 * goodix_i2c_test - I2C test function to check if the device answers. 1090 * 1091 * @client: the i2c client 1092 */ 1093 static int goodix_i2c_test(struct i2c_client *client) 1094 { 1095 int retry = 0; 1096 int error; 1097 u8 test; 1098 1099 while (retry++ < 2) { 1100 error = goodix_i2c_read(client, GOODIX_REG_ID, &test, 1); 1101 if (!error) 1102 return 0; 1103 1104 msleep(20); 1105 } 1106 1107 return error; 1108 } 1109 1110 /** 1111 * goodix_configure_dev - Finish device initialization 1112 * 1113 * @ts: our goodix_ts_data pointer 1114 * 1115 * Must be called from probe to finish initialization of the device. 1116 * Contains the common initialization code for both devices that 1117 * declare gpio pins and devices that do not. It is either called 1118 * directly from probe or from request_firmware_wait callback. 1119 */ 1120 static int goodix_configure_dev(struct goodix_ts_data *ts) 1121 { 1122 int error; 1123 int i; 1124 1125 ts->int_trigger_type = GOODIX_INT_TRIGGER; 1126 ts->max_touch_num = GOODIX_MAX_CONTACTS; 1127 1128 ts->input_dev = devm_input_allocate_device(&ts->client->dev); 1129 if (!ts->input_dev) { 1130 dev_err(&ts->client->dev, "Failed to allocate input device."); 1131 return -ENOMEM; 1132 } 1133 1134 ts->input_dev->name = "Goodix Capacitive TouchScreen"; 1135 ts->input_dev->phys = "input/ts"; 1136 ts->input_dev->id.bustype = BUS_I2C; 1137 ts->input_dev->id.vendor = 0x0416; 1138 if (kstrtou16(ts->id, 10, &ts->input_dev->id.product)) 1139 ts->input_dev->id.product = 0x1001; 1140 ts->input_dev->id.version = ts->version; 1141 1142 ts->input_dev->keycode = ts->keymap; 1143 ts->input_dev->keycodesize = sizeof(ts->keymap[0]); 1144 ts->input_dev->keycodemax = GOODIX_MAX_KEYS; 1145 1146 /* Capacitive Windows/Home button on some devices */ 1147 for (i = 0; i < GOODIX_MAX_KEYS; ++i) { 1148 if (i == 0) 1149 ts->keymap[i] = KEY_LEFTMETA; 1150 else 1151 ts->keymap[i] = KEY_F1 + (i - 1); 1152 1153 input_set_capability(ts->input_dev, EV_KEY, ts->keymap[i]); 1154 } 1155 1156 input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_X); 1157 input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_Y); 1158 input_set_abs_params(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0); 1159 input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); 1160 1161 retry_read_config: 1162 /* Read configuration and apply touchscreen parameters */ 1163 goodix_read_config(ts); 1164 1165 /* Try overriding touchscreen parameters via device properties */ 1166 touchscreen_parse_properties(ts->input_dev, true, &ts->prop); 1167 1168 if (!ts->prop.max_x || !ts->prop.max_y || !ts->max_touch_num) { 1169 if (!ts->reset_controller_at_probe && 1170 ts->irq_pin_access_method != IRQ_PIN_ACCESS_NONE) { 1171 dev_info(&ts->client->dev, "Config not set, resetting controller\n"); 1172 /* Retry after a controller reset */ 1173 ts->reset_controller_at_probe = true; 1174 error = goodix_reset(ts); 1175 if (error) 1176 return error; 1177 goto retry_read_config; 1178 } 1179 dev_err(&ts->client->dev, 1180 "Invalid config (%d, %d, %d), using defaults\n", 1181 ts->prop.max_x, ts->prop.max_y, ts->max_touch_num); 1182 ts->prop.max_x = GOODIX_MAX_WIDTH - 1; 1183 ts->prop.max_y = GOODIX_MAX_HEIGHT - 1; 1184 ts->max_touch_num = GOODIX_MAX_CONTACTS; 1185 input_abs_set_max(ts->input_dev, 1186 ABS_MT_POSITION_X, ts->prop.max_x); 1187 input_abs_set_max(ts->input_dev, 1188 ABS_MT_POSITION_Y, ts->prop.max_y); 1189 } 1190 1191 if (dmi_check_system(nine_bytes_report)) { 1192 ts->contact_size = 9; 1193 1194 dev_dbg(&ts->client->dev, 1195 "Non-standard 9-bytes report format quirk\n"); 1196 } 1197 1198 if (dmi_check_system(inverted_x_screen)) { 1199 ts->prop.invert_x = true; 1200 dev_dbg(&ts->client->dev, 1201 "Applying 'inverted x screen' quirk\n"); 1202 } 1203 1204 error = input_mt_init_slots(ts->input_dev, ts->max_touch_num, 1205 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); 1206 if (error) { 1207 dev_err(&ts->client->dev, 1208 "Failed to initialize MT slots: %d", error); 1209 return error; 1210 } 1211 1212 error = input_register_device(ts->input_dev); 1213 if (error) { 1214 dev_err(&ts->client->dev, 1215 "Failed to register input device: %d", error); 1216 return error; 1217 } 1218 1219 /* 1220 * Create the input_pen device before goodix_request_irq() calls 1221 * devm_request_threaded_irq() so that the devm framework frees 1222 * it after disabling the irq. 1223 * Unfortunately there is no way to detect if the touchscreen has pen 1224 * support, so registering the dev is delayed till the first pen event. 1225 */ 1226 error = goodix_create_pen_input(ts); 1227 if (error) 1228 return error; 1229 1230 ts->irq_flags = goodix_irq_flags[ts->int_trigger_type] | IRQF_ONESHOT; 1231 error = goodix_request_irq(ts); 1232 if (error) { 1233 dev_err(&ts->client->dev, "request IRQ failed: %d\n", error); 1234 return error; 1235 } 1236 1237 return 0; 1238 } 1239 1240 /** 1241 * goodix_config_cb - Callback to finish device init 1242 * 1243 * @cfg: firmware config 1244 * @ctx: our goodix_ts_data pointer 1245 * 1246 * request_firmware_wait callback that finishes 1247 * initialization of the device. 1248 */ 1249 static void goodix_config_cb(const struct firmware *cfg, void *ctx) 1250 { 1251 struct goodix_ts_data *ts = ctx; 1252 int error; 1253 1254 if (ts->firmware_name) { 1255 if (!cfg) 1256 goto err_release_cfg; 1257 1258 error = goodix_check_cfg(ts, cfg->data, cfg->size); 1259 if (error) 1260 goto err_release_cfg; 1261 1262 memcpy(ts->config, cfg->data, cfg->size); 1263 } else if (cfg) { 1264 /* send device configuration to the firmware */ 1265 error = goodix_send_cfg(ts, cfg->data, cfg->size); 1266 if (error) 1267 goto err_release_cfg; 1268 } 1269 1270 goodix_configure_dev(ts); 1271 1272 err_release_cfg: 1273 release_firmware(cfg); 1274 complete_all(&ts->firmware_loading_complete); 1275 } 1276 1277 static void goodix_disable_regulators(void *arg) 1278 { 1279 struct goodix_ts_data *ts = arg; 1280 1281 regulator_disable(ts->vddio); 1282 regulator_disable(ts->avdd28); 1283 } 1284 1285 static int goodix_ts_probe(struct i2c_client *client) 1286 { 1287 struct goodix_ts_data *ts; 1288 const char *cfg_name; 1289 int error; 1290 1291 dev_dbg(&client->dev, "I2C Address: 0x%02x\n", client->addr); 1292 1293 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { 1294 dev_err(&client->dev, "I2C check functionality failed.\n"); 1295 return -ENXIO; 1296 } 1297 1298 ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL); 1299 if (!ts) 1300 return -ENOMEM; 1301 1302 ts->client = client; 1303 i2c_set_clientdata(client, ts); 1304 init_completion(&ts->firmware_loading_complete); 1305 ts->contact_size = GOODIX_CONTACT_SIZE; 1306 1307 error = goodix_get_gpio_config(ts); 1308 if (error) 1309 return error; 1310 1311 /* power up the controller */ 1312 error = regulator_enable(ts->avdd28); 1313 if (error) { 1314 dev_err(&client->dev, 1315 "Failed to enable AVDD28 regulator: %d\n", 1316 error); 1317 return error; 1318 } 1319 1320 error = regulator_enable(ts->vddio); 1321 if (error) { 1322 dev_err(&client->dev, 1323 "Failed to enable VDDIO regulator: %d\n", 1324 error); 1325 regulator_disable(ts->avdd28); 1326 return error; 1327 } 1328 1329 error = devm_add_action_or_reset(&client->dev, 1330 goodix_disable_regulators, ts); 1331 if (error) 1332 return error; 1333 1334 reset: 1335 if (ts->reset_controller_at_probe) { 1336 /* reset the controller */ 1337 error = goodix_reset(ts); 1338 if (error) 1339 return error; 1340 } 1341 1342 error = goodix_i2c_test(client); 1343 if (error) { 1344 if (!ts->reset_controller_at_probe && 1345 ts->irq_pin_access_method != IRQ_PIN_ACCESS_NONE) { 1346 /* Retry after a controller reset */ 1347 ts->reset_controller_at_probe = true; 1348 goto reset; 1349 } 1350 dev_err(&client->dev, "I2C communication failure: %d\n", error); 1351 return error; 1352 } 1353 1354 error = goodix_firmware_check(ts); 1355 if (error) 1356 return error; 1357 1358 error = goodix_read_version(ts); 1359 if (error) 1360 return error; 1361 1362 ts->chip = goodix_get_chip_data(ts->id); 1363 1364 if (ts->load_cfg_from_disk) { 1365 /* update device config */ 1366 error = device_property_read_string(&client->dev, 1367 "goodix,config-name", 1368 &cfg_name); 1369 if (!error) 1370 snprintf(ts->cfg_name, sizeof(ts->cfg_name), 1371 "goodix/%s", cfg_name); 1372 else 1373 snprintf(ts->cfg_name, sizeof(ts->cfg_name), 1374 "goodix_%s_cfg.bin", ts->id); 1375 1376 error = request_firmware_nowait(THIS_MODULE, true, ts->cfg_name, 1377 &client->dev, GFP_KERNEL, ts, 1378 goodix_config_cb); 1379 if (error) { 1380 dev_err(&client->dev, 1381 "Failed to invoke firmware loader: %d\n", 1382 error); 1383 return error; 1384 } 1385 1386 return 0; 1387 } else { 1388 error = goodix_configure_dev(ts); 1389 if (error) 1390 return error; 1391 } 1392 1393 return 0; 1394 } 1395 1396 static void goodix_ts_remove(struct i2c_client *client) 1397 { 1398 struct goodix_ts_data *ts = i2c_get_clientdata(client); 1399 1400 if (ts->load_cfg_from_disk) 1401 wait_for_completion(&ts->firmware_loading_complete); 1402 } 1403 1404 static int __maybe_unused goodix_suspend(struct device *dev) 1405 { 1406 struct i2c_client *client = to_i2c_client(dev); 1407 struct goodix_ts_data *ts = i2c_get_clientdata(client); 1408 int error; 1409 1410 if (ts->load_cfg_from_disk) 1411 wait_for_completion(&ts->firmware_loading_complete); 1412 1413 /* We need gpio pins to suspend/resume */ 1414 if (ts->irq_pin_access_method == IRQ_PIN_ACCESS_NONE) { 1415 disable_irq(client->irq); 1416 return 0; 1417 } 1418 1419 /* Free IRQ as IRQ pin is used as output in the suspend sequence */ 1420 goodix_free_irq(ts); 1421 1422 /* Save reference (calibration) info if necessary */ 1423 goodix_save_bak_ref(ts); 1424 1425 /* Output LOW on the INT pin for 5 ms */ 1426 error = goodix_irq_direction_output(ts, 0); 1427 if (error) { 1428 goodix_request_irq(ts); 1429 return error; 1430 } 1431 1432 usleep_range(5000, 6000); 1433 1434 error = goodix_i2c_write_u8(ts->client, GOODIX_REG_COMMAND, 1435 GOODIX_CMD_SCREEN_OFF); 1436 if (error) { 1437 goodix_irq_direction_input(ts); 1438 goodix_request_irq(ts); 1439 return -EAGAIN; 1440 } 1441 1442 /* 1443 * The datasheet specifies that the interval between sending screen-off 1444 * command and wake-up should be longer than 58 ms. To avoid waking up 1445 * sooner, delay 58ms here. 1446 */ 1447 msleep(58); 1448 return 0; 1449 } 1450 1451 static int __maybe_unused goodix_resume(struct device *dev) 1452 { 1453 struct i2c_client *client = to_i2c_client(dev); 1454 struct goodix_ts_data *ts = i2c_get_clientdata(client); 1455 u8 config_ver; 1456 int error; 1457 1458 if (ts->irq_pin_access_method == IRQ_PIN_ACCESS_NONE) { 1459 enable_irq(client->irq); 1460 return 0; 1461 } 1462 1463 /* 1464 * Exit sleep mode by outputting HIGH level to INT pin 1465 * for 2ms~5ms. 1466 */ 1467 error = goodix_irq_direction_output(ts, 1); 1468 if (error) 1469 return error; 1470 1471 usleep_range(2000, 5000); 1472 1473 error = goodix_int_sync(ts); 1474 if (error) 1475 return error; 1476 1477 error = goodix_i2c_read(ts->client, ts->chip->config_addr, 1478 &config_ver, 1); 1479 if (!error && config_ver != ts->config[0]) 1480 dev_info(dev, "Config version mismatch %d != %d, resetting controller\n", 1481 config_ver, ts->config[0]); 1482 1483 if (error != 0 || config_ver != ts->config[0]) { 1484 error = goodix_reset(ts); 1485 if (error) 1486 return error; 1487 1488 error = goodix_send_cfg(ts, ts->config, ts->chip->config_len); 1489 if (error) 1490 return error; 1491 } 1492 1493 error = goodix_request_irq(ts); 1494 if (error) 1495 return error; 1496 1497 return 0; 1498 } 1499 1500 static SIMPLE_DEV_PM_OPS(goodix_pm_ops, goodix_suspend, goodix_resume); 1501 1502 static const struct i2c_device_id goodix_ts_id[] = { 1503 { "GDIX1001:00", 0 }, 1504 { } 1505 }; 1506 MODULE_DEVICE_TABLE(i2c, goodix_ts_id); 1507 1508 #ifdef CONFIG_ACPI 1509 static const struct acpi_device_id goodix_acpi_match[] = { 1510 { "GDIX1001", 0 }, 1511 { "GDIX1002", 0 }, 1512 { } 1513 }; 1514 MODULE_DEVICE_TABLE(acpi, goodix_acpi_match); 1515 #endif 1516 1517 #ifdef CONFIG_OF 1518 static const struct of_device_id goodix_of_match[] = { 1519 { .compatible = "goodix,gt1151" }, 1520 { .compatible = "goodix,gt1158" }, 1521 { .compatible = "goodix,gt5663" }, 1522 { .compatible = "goodix,gt5688" }, 1523 { .compatible = "goodix,gt911" }, 1524 { .compatible = "goodix,gt9110" }, 1525 { .compatible = "goodix,gt912" }, 1526 { .compatible = "goodix,gt9147" }, 1527 { .compatible = "goodix,gt917s" }, 1528 { .compatible = "goodix,gt927" }, 1529 { .compatible = "goodix,gt9271" }, 1530 { .compatible = "goodix,gt928" }, 1531 { .compatible = "goodix,gt9286" }, 1532 { .compatible = "goodix,gt967" }, 1533 { } 1534 }; 1535 MODULE_DEVICE_TABLE(of, goodix_of_match); 1536 #endif 1537 1538 static struct i2c_driver goodix_ts_driver = { 1539 .probe_new = goodix_ts_probe, 1540 .remove = goodix_ts_remove, 1541 .id_table = goodix_ts_id, 1542 .driver = { 1543 .name = "Goodix-TS", 1544 .acpi_match_table = ACPI_PTR(goodix_acpi_match), 1545 .of_match_table = of_match_ptr(goodix_of_match), 1546 .pm = &goodix_pm_ops, 1547 }, 1548 }; 1549 module_i2c_driver(goodix_ts_driver); 1550 1551 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>"); 1552 MODULE_AUTHOR("Bastien Nocera <hadess@hadess.net>"); 1553 MODULE_DESCRIPTION("Goodix touchscreen driver"); 1554 MODULE_LICENSE("GPL v2"); 1555