1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright (C) 2012-2013 MundoReader S.L. 4 * Author: Heiko Stuebner <heiko@sntech.de> 5 * 6 * based in parts on Nook zforce driver 7 * 8 * Copyright (C) 2010 Barnes & Noble, Inc. 9 * Author: Pieter Truter<ptruter@intrinsyc.com> 10 */ 11 12#include <linux/module.h> 13#include <linux/hrtimer.h> 14#include <linux/slab.h> 15#include <linux/input.h> 16#include <linux/interrupt.h> 17#include <linux/i2c.h> 18#include <linux/delay.h> 19#include <linux/gpio/consumer.h> 20#include <linux/device.h> 21#include <linux/sysfs.h> 22#include <linux/input/mt.h> 23#include <linux/input/touchscreen.h> 24#include <linux/platform_data/zforce_ts.h> 25#include <linux/regulator/consumer.h> 26#include <linux/of.h> 27 28#define WAIT_TIMEOUT msecs_to_jiffies(1000) 29 30#define FRAME_START 0xee 31#define FRAME_MAXSIZE 257 32 33/* Offsets of the different parts of the payload the controller sends */ 34#define PAYLOAD_HEADER 0 35#define PAYLOAD_LENGTH 1 36#define PAYLOAD_BODY 2 37 38/* Response offsets */ 39#define RESPONSE_ID 0 40#define RESPONSE_DATA 1 41 42/* Commands */ 43#define COMMAND_DEACTIVATE 0x00 44#define COMMAND_INITIALIZE 0x01 45#define COMMAND_RESOLUTION 0x02 46#define COMMAND_SETCONFIG 0x03 47#define COMMAND_DATAREQUEST 0x04 48#define COMMAND_SCANFREQ 0x08 49#define COMMAND_STATUS 0X1e 50 51/* 52 * Responses the controller sends as a result of 53 * command requests 54 */ 55#define RESPONSE_DEACTIVATE 0x00 56#define RESPONSE_INITIALIZE 0x01 57#define RESPONSE_RESOLUTION 0x02 58#define RESPONSE_SETCONFIG 0x03 59#define RESPONSE_SCANFREQ 0x08 60#define RESPONSE_STATUS 0X1e 61 62/* 63 * Notifications are sent by the touch controller without 64 * being requested by the driver and include for example 65 * touch indications 66 */ 67#define NOTIFICATION_TOUCH 0x04 68#define NOTIFICATION_BOOTCOMPLETE 0x07 69#define NOTIFICATION_OVERRUN 0x25 70#define NOTIFICATION_PROXIMITY 0x26 71#define NOTIFICATION_INVALID_COMMAND 0xfe 72 73#define ZFORCE_REPORT_POINTS 2 74#define ZFORCE_MAX_AREA 0xff 75 76#define STATE_DOWN 0 77#define STATE_MOVE 1 78#define STATE_UP 2 79 80#define SETCONFIG_DUALTOUCH (1 << 0) 81 82struct zforce_point { 83 int coord_x; 84 int coord_y; 85 int state; 86 int id; 87 int area_major; 88 int area_minor; 89 int orientation; 90 int pressure; 91 int prblty; 92}; 93 94/* 95 * @client the i2c_client 96 * @input the input device 97 * @suspending in the process of going to suspend (don't emit wakeup 98 * events for commands executed to suspend the device) 99 * @suspended device suspended 100 * @access_mutex serialize i2c-access, to keep multipart reads together 101 * @command_done completion to wait for the command result 102 * @command_mutex serialize commands sent to the ic 103 * @command_waiting the id of the command that is currently waiting 104 * for a result 105 * @command_result returned result of the command 106 */ 107struct zforce_ts { 108 struct i2c_client *client; 109 struct input_dev *input; 110 struct touchscreen_properties prop; 111 const struct zforce_ts_platdata *pdata; 112 char phys[32]; 113 114 struct regulator *reg_vdd; 115 116 struct gpio_desc *gpio_int; 117 struct gpio_desc *gpio_rst; 118 119 bool suspending; 120 bool suspended; 121 bool boot_complete; 122 123 /* Firmware version information */ 124 u16 version_major; 125 u16 version_minor; 126 u16 version_build; 127 u16 version_rev; 128 129 struct mutex access_mutex; 130 131 struct completion command_done; 132 struct mutex command_mutex; 133 int command_waiting; 134 int command_result; 135}; 136 137static int zforce_command(struct zforce_ts *ts, u8 cmd) 138{ 139 struct i2c_client *client = ts->client; 140 char buf[3]; 141 int ret; 142 143 dev_dbg(&client->dev, "%s: 0x%x\n", __func__, cmd); 144 145 buf[0] = FRAME_START; 146 buf[1] = 1; /* data size, command only */ 147 buf[2] = cmd; 148 149 mutex_lock(&ts->access_mutex); 150 ret = i2c_master_send(client, &buf[0], ARRAY_SIZE(buf)); 151 mutex_unlock(&ts->access_mutex); 152 if (ret < 0) { 153 dev_err(&client->dev, "i2c send data request error: %d\n", ret); 154 return ret; 155 } 156 157 return 0; 158} 159 160static void zforce_reset_assert(struct zforce_ts *ts) 161{ 162 gpiod_set_value_cansleep(ts->gpio_rst, 1); 163} 164 165static void zforce_reset_deassert(struct zforce_ts *ts) 166{ 167 gpiod_set_value_cansleep(ts->gpio_rst, 0); 168} 169 170static int zforce_send_wait(struct zforce_ts *ts, const char *buf, int len) 171{ 172 struct i2c_client *client = ts->client; 173 int ret; 174 175 ret = mutex_trylock(&ts->command_mutex); 176 if (!ret) { 177 dev_err(&client->dev, "already waiting for a command\n"); 178 return -EBUSY; 179 } 180 181 dev_dbg(&client->dev, "sending %d bytes for command 0x%x\n", 182 buf[1], buf[2]); 183 184 ts->command_waiting = buf[2]; 185 186 mutex_lock(&ts->access_mutex); 187 ret = i2c_master_send(client, buf, len); 188 mutex_unlock(&ts->access_mutex); 189 if (ret < 0) { 190 dev_err(&client->dev, "i2c send data request error: %d\n", ret); 191 goto unlock; 192 } 193 194 dev_dbg(&client->dev, "waiting for result for command 0x%x\n", buf[2]); 195 196 if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0) { 197 ret = -ETIME; 198 goto unlock; 199 } 200 201 ret = ts->command_result; 202 203unlock: 204 mutex_unlock(&ts->command_mutex); 205 return ret; 206} 207 208static int zforce_command_wait(struct zforce_ts *ts, u8 cmd) 209{ 210 struct i2c_client *client = ts->client; 211 char buf[3]; 212 int ret; 213 214 dev_dbg(&client->dev, "%s: 0x%x\n", __func__, cmd); 215 216 buf[0] = FRAME_START; 217 buf[1] = 1; /* data size, command only */ 218 buf[2] = cmd; 219 220 ret = zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); 221 if (ret < 0) { 222 dev_err(&client->dev, "i2c send data request error: %d\n", ret); 223 return ret; 224 } 225 226 return 0; 227} 228 229static int zforce_resolution(struct zforce_ts *ts, u16 x, u16 y) 230{ 231 struct i2c_client *client = ts->client; 232 char buf[7] = { FRAME_START, 5, COMMAND_RESOLUTION, 233 (x & 0xff), ((x >> 8) & 0xff), 234 (y & 0xff), ((y >> 8) & 0xff) }; 235 236 dev_dbg(&client->dev, "set resolution to (%d,%d)\n", x, y); 237 238 return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); 239} 240 241static int zforce_scan_frequency(struct zforce_ts *ts, u16 idle, u16 finger, 242 u16 stylus) 243{ 244 struct i2c_client *client = ts->client; 245 char buf[9] = { FRAME_START, 7, COMMAND_SCANFREQ, 246 (idle & 0xff), ((idle >> 8) & 0xff), 247 (finger & 0xff), ((finger >> 8) & 0xff), 248 (stylus & 0xff), ((stylus >> 8) & 0xff) }; 249 250 dev_dbg(&client->dev, 251 "set scan frequency to (idle: %d, finger: %d, stylus: %d)\n", 252 idle, finger, stylus); 253 254 return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); 255} 256 257static int zforce_setconfig(struct zforce_ts *ts, char b1) 258{ 259 struct i2c_client *client = ts->client; 260 char buf[7] = { FRAME_START, 5, COMMAND_SETCONFIG, 261 b1, 0, 0, 0 }; 262 263 dev_dbg(&client->dev, "set config to (%d)\n", b1); 264 265 return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); 266} 267 268static int zforce_start(struct zforce_ts *ts) 269{ 270 struct i2c_client *client = ts->client; 271 int ret; 272 273 dev_dbg(&client->dev, "starting device\n"); 274 275 ret = zforce_command_wait(ts, COMMAND_INITIALIZE); 276 if (ret) { 277 dev_err(&client->dev, "Unable to initialize, %d\n", ret); 278 return ret; 279 } 280 281 ret = zforce_resolution(ts, ts->prop.max_x, ts->prop.max_y); 282 if (ret) { 283 dev_err(&client->dev, "Unable to set resolution, %d\n", ret); 284 goto error; 285 } 286 287 ret = zforce_scan_frequency(ts, 10, 50, 50); 288 if (ret) { 289 dev_err(&client->dev, "Unable to set scan frequency, %d\n", 290 ret); 291 goto error; 292 } 293 294 ret = zforce_setconfig(ts, SETCONFIG_DUALTOUCH); 295 if (ret) { 296 dev_err(&client->dev, "Unable to set config\n"); 297 goto error; 298 } 299 300 /* start sending touch events */ 301 ret = zforce_command(ts, COMMAND_DATAREQUEST); 302 if (ret) { 303 dev_err(&client->dev, "Unable to request data\n"); 304 goto error; 305 } 306 307 /* 308 * Per NN, initial cal. take max. of 200msec. 309 * Allow time to complete this calibration 310 */ 311 msleep(200); 312 313 return 0; 314 315error: 316 zforce_command_wait(ts, COMMAND_DEACTIVATE); 317 return ret; 318} 319 320static int zforce_stop(struct zforce_ts *ts) 321{ 322 struct i2c_client *client = ts->client; 323 int ret; 324 325 dev_dbg(&client->dev, "stopping device\n"); 326 327 /* Deactivates touch sensing and puts the device into sleep. */ 328 ret = zforce_command_wait(ts, COMMAND_DEACTIVATE); 329 if (ret != 0) { 330 dev_err(&client->dev, "could not deactivate device, %d\n", 331 ret); 332 return ret; 333 } 334 335 return 0; 336} 337 338static int zforce_touch_event(struct zforce_ts *ts, u8 *payload) 339{ 340 struct i2c_client *client = ts->client; 341 struct zforce_point point; 342 int count, i, num = 0; 343 344 count = payload[0]; 345 if (count > ZFORCE_REPORT_POINTS) { 346 dev_warn(&client->dev, 347 "too many coordinates %d, expected max %d\n", 348 count, ZFORCE_REPORT_POINTS); 349 count = ZFORCE_REPORT_POINTS; 350 } 351 352 for (i = 0; i < count; i++) { 353 point.coord_x = 354 payload[9 * i + 2] << 8 | payload[9 * i + 1]; 355 point.coord_y = 356 payload[9 * i + 4] << 8 | payload[9 * i + 3]; 357 358 if (point.coord_x > ts->prop.max_x || 359 point.coord_y > ts->prop.max_y) { 360 dev_warn(&client->dev, "coordinates (%d,%d) invalid\n", 361 point.coord_x, point.coord_y); 362 point.coord_x = point.coord_y = 0; 363 } 364 365 point.state = payload[9 * i + 5] & 0x0f; 366 point.id = (payload[9 * i + 5] & 0xf0) >> 4; 367 368 /* determine touch major, minor and orientation */ 369 point.area_major = max(payload[9 * i + 6], 370 payload[9 * i + 7]); 371 point.area_minor = min(payload[9 * i + 6], 372 payload[9 * i + 7]); 373 point.orientation = payload[9 * i + 6] > payload[9 * i + 7]; 374 375 point.pressure = payload[9 * i + 8]; 376 point.prblty = payload[9 * i + 9]; 377 378 dev_dbg(&client->dev, 379 "point %d/%d: state %d, id %d, pressure %d, prblty %d, x %d, y %d, amajor %d, aminor %d, ori %d\n", 380 i, count, point.state, point.id, 381 point.pressure, point.prblty, 382 point.coord_x, point.coord_y, 383 point.area_major, point.area_minor, 384 point.orientation); 385 386 /* the zforce id starts with "1", so needs to be decreased */ 387 input_mt_slot(ts->input, point.id - 1); 388 389 input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, 390 point.state != STATE_UP); 391 392 if (point.state != STATE_UP) { 393 touchscreen_report_pos(ts->input, &ts->prop, 394 point.coord_x, point.coord_y, 395 true); 396 input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, 397 point.area_major); 398 input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, 399 point.area_minor); 400 input_report_abs(ts->input, ABS_MT_ORIENTATION, 401 point.orientation); 402 num++; 403 } 404 } 405 406 input_mt_sync_frame(ts->input); 407 408 input_mt_report_finger_count(ts->input, num); 409 410 input_sync(ts->input); 411 412 return 0; 413} 414 415static int zforce_read_packet(struct zforce_ts *ts, u8 *buf) 416{ 417 struct i2c_client *client = ts->client; 418 int ret; 419 420 mutex_lock(&ts->access_mutex); 421 422 /* read 2 byte message header */ 423 ret = i2c_master_recv(client, buf, 2); 424 if (ret < 0) { 425 dev_err(&client->dev, "error reading header: %d\n", ret); 426 goto unlock; 427 } 428 429 if (buf[PAYLOAD_HEADER] != FRAME_START) { 430 dev_err(&client->dev, "invalid frame start: %d\n", buf[0]); 431 ret = -EIO; 432 goto unlock; 433 } 434 435 if (buf[PAYLOAD_LENGTH] == 0) { 436 dev_err(&client->dev, "invalid payload length: %d\n", 437 buf[PAYLOAD_LENGTH]); 438 ret = -EIO; 439 goto unlock; 440 } 441 442 /* read the message */ 443 ret = i2c_master_recv(client, &buf[PAYLOAD_BODY], buf[PAYLOAD_LENGTH]); 444 if (ret < 0) { 445 dev_err(&client->dev, "error reading payload: %d\n", ret); 446 goto unlock; 447 } 448 449 dev_dbg(&client->dev, "read %d bytes for response command 0x%x\n", 450 buf[PAYLOAD_LENGTH], buf[PAYLOAD_BODY]); 451 452unlock: 453 mutex_unlock(&ts->access_mutex); 454 return ret; 455} 456 457static void zforce_complete(struct zforce_ts *ts, int cmd, int result) 458{ 459 struct i2c_client *client = ts->client; 460 461 if (ts->command_waiting == cmd) { 462 dev_dbg(&client->dev, "completing command 0x%x\n", cmd); 463 ts->command_result = result; 464 complete(&ts->command_done); 465 } else { 466 dev_dbg(&client->dev, "command %d not for us\n", cmd); 467 } 468} 469 470static irqreturn_t zforce_irq(int irq, void *dev_id) 471{ 472 struct zforce_ts *ts = dev_id; 473 struct i2c_client *client = ts->client; 474 475 if (ts->suspended && device_may_wakeup(&client->dev)) 476 pm_wakeup_event(&client->dev, 500); 477 478 return IRQ_WAKE_THREAD; 479} 480 481static irqreturn_t zforce_irq_thread(int irq, void *dev_id) 482{ 483 struct zforce_ts *ts = dev_id; 484 struct i2c_client *client = ts->client; 485 int ret; 486 u8 payload_buffer[FRAME_MAXSIZE]; 487 u8 *payload; 488 489 /* 490 * When still suspended, return. 491 * Due to the level-interrupt we will get re-triggered later. 492 */ 493 if (ts->suspended) { 494 msleep(20); 495 return IRQ_HANDLED; 496 } 497 498 dev_dbg(&client->dev, "handling interrupt\n"); 499 500 /* Don't emit wakeup events from commands run by zforce_suspend */ 501 if (!ts->suspending && device_may_wakeup(&client->dev)) 502 pm_stay_awake(&client->dev); 503 504 /* 505 * Run at least once and exit the loop if 506 * - the optional interrupt GPIO isn't specified 507 * (there is only one packet read per ISR invocation, then) 508 * or 509 * - the GPIO isn't active any more 510 * (packet read until the level GPIO indicates that there is 511 * no IRQ any more) 512 */ 513 do { 514 ret = zforce_read_packet(ts, payload_buffer); 515 if (ret < 0) { 516 dev_err(&client->dev, 517 "could not read packet, ret: %d\n", ret); 518 break; 519 } 520 521 payload = &payload_buffer[PAYLOAD_BODY]; 522 523 switch (payload[RESPONSE_ID]) { 524 case NOTIFICATION_TOUCH: 525 /* 526 * Always report touch-events received while 527 * suspending, when being a wakeup source 528 */ 529 if (ts->suspending && device_may_wakeup(&client->dev)) 530 pm_wakeup_event(&client->dev, 500); 531 zforce_touch_event(ts, &payload[RESPONSE_DATA]); 532 break; 533 534 case NOTIFICATION_BOOTCOMPLETE: 535 ts->boot_complete = payload[RESPONSE_DATA]; 536 zforce_complete(ts, payload[RESPONSE_ID], 0); 537 break; 538 539 case RESPONSE_INITIALIZE: 540 case RESPONSE_DEACTIVATE: 541 case RESPONSE_SETCONFIG: 542 case RESPONSE_RESOLUTION: 543 case RESPONSE_SCANFREQ: 544 zforce_complete(ts, payload[RESPONSE_ID], 545 payload[RESPONSE_DATA]); 546 break; 547 548 case RESPONSE_STATUS: 549 /* 550 * Version Payload Results 551 * [2:major] [2:minor] [2:build] [2:rev] 552 */ 553 ts->version_major = (payload[RESPONSE_DATA + 1] << 8) | 554 payload[RESPONSE_DATA]; 555 ts->version_minor = (payload[RESPONSE_DATA + 3] << 8) | 556 payload[RESPONSE_DATA + 2]; 557 ts->version_build = (payload[RESPONSE_DATA + 5] << 8) | 558 payload[RESPONSE_DATA + 4]; 559 ts->version_rev = (payload[RESPONSE_DATA + 7] << 8) | 560 payload[RESPONSE_DATA + 6]; 561 dev_dbg(&ts->client->dev, 562 "Firmware Version %04x:%04x %04x:%04x\n", 563 ts->version_major, ts->version_minor, 564 ts->version_build, ts->version_rev); 565 566 zforce_complete(ts, payload[RESPONSE_ID], 0); 567 break; 568 569 case NOTIFICATION_INVALID_COMMAND: 570 dev_err(&ts->client->dev, "invalid command: 0x%x\n", 571 payload[RESPONSE_DATA]); 572 break; 573 574 default: 575 dev_err(&ts->client->dev, 576 "unrecognized response id: 0x%x\n", 577 payload[RESPONSE_ID]); 578 break; 579 } 580 } while (gpiod_get_value_cansleep(ts->gpio_int)); 581 582 if (!ts->suspending && device_may_wakeup(&client->dev)) 583 pm_relax(&client->dev); 584 585 dev_dbg(&client->dev, "finished interrupt\n"); 586 587 return IRQ_HANDLED; 588} 589 590static int zforce_input_open(struct input_dev *dev) 591{ 592 struct zforce_ts *ts = input_get_drvdata(dev); 593 594 return zforce_start(ts); 595} 596 597static void zforce_input_close(struct input_dev *dev) 598{ 599 struct zforce_ts *ts = input_get_drvdata(dev); 600 struct i2c_client *client = ts->client; 601 int ret; 602 603 ret = zforce_stop(ts); 604 if (ret) 605 dev_warn(&client->dev, "stopping zforce failed\n"); 606 607 return; 608} 609 610static int zforce_suspend(struct device *dev) 611{ 612 struct i2c_client *client = to_i2c_client(dev); 613 struct zforce_ts *ts = i2c_get_clientdata(client); 614 struct input_dev *input = ts->input; 615 int ret = 0; 616 617 mutex_lock(&input->mutex); 618 ts->suspending = true; 619 620 /* 621 * When configured as a wakeup source device should always wake 622 * the system, therefore start device if necessary. 623 */ 624 if (device_may_wakeup(&client->dev)) { 625 dev_dbg(&client->dev, "suspend while being a wakeup source\n"); 626 627 /* Need to start device, if not open, to be a wakeup source. */ 628 if (!input_device_enabled(input)) { 629 ret = zforce_start(ts); 630 if (ret) 631 goto unlock; 632 } 633 634 enable_irq_wake(client->irq); 635 } else if (input_device_enabled(input)) { 636 dev_dbg(&client->dev, 637 "suspend without being a wakeup source\n"); 638 639 ret = zforce_stop(ts); 640 if (ret) 641 goto unlock; 642 643 disable_irq(client->irq); 644 } 645 646 ts->suspended = true; 647 648unlock: 649 ts->suspending = false; 650 mutex_unlock(&input->mutex); 651 652 return ret; 653} 654 655static int zforce_resume(struct device *dev) 656{ 657 struct i2c_client *client = to_i2c_client(dev); 658 struct zforce_ts *ts = i2c_get_clientdata(client); 659 struct input_dev *input = ts->input; 660 int ret = 0; 661 662 mutex_lock(&input->mutex); 663 664 ts->suspended = false; 665 666 if (device_may_wakeup(&client->dev)) { 667 dev_dbg(&client->dev, "resume from being a wakeup source\n"); 668 669 disable_irq_wake(client->irq); 670 671 /* need to stop device if it was not open on suspend */ 672 if (!input_device_enabled(input)) { 673 ret = zforce_stop(ts); 674 if (ret) 675 goto unlock; 676 } 677 } else if (input_device_enabled(input)) { 678 dev_dbg(&client->dev, "resume without being a wakeup source\n"); 679 680 enable_irq(client->irq); 681 682 ret = zforce_start(ts); 683 if (ret < 0) 684 goto unlock; 685 } 686 687unlock: 688 mutex_unlock(&input->mutex); 689 690 return ret; 691} 692 693static DEFINE_SIMPLE_DEV_PM_OPS(zforce_pm_ops, zforce_suspend, zforce_resume); 694 695static void zforce_reset(void *data) 696{ 697 struct zforce_ts *ts = data; 698 699 zforce_reset_assert(ts); 700 701 udelay(10); 702 703 if (!IS_ERR(ts->reg_vdd)) 704 regulator_disable(ts->reg_vdd); 705} 706 707static struct zforce_ts_platdata *zforce_parse_dt(struct device *dev) 708{ 709 struct zforce_ts_platdata *pdata; 710 struct device_node *np = dev->of_node; 711 712 if (!np) 713 return ERR_PTR(-ENOENT); 714 715 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 716 if (!pdata) { 717 dev_err(dev, "failed to allocate platform data\n"); 718 return ERR_PTR(-ENOMEM); 719 } 720 721 of_property_read_u32(np, "x-size", &pdata->x_max); 722 of_property_read_u32(np, "y-size", &pdata->y_max); 723 724 return pdata; 725} 726 727static int zforce_probe(struct i2c_client *client) 728{ 729 const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev); 730 struct zforce_ts *ts; 731 struct input_dev *input_dev; 732 int ret; 733 734 if (!pdata) { 735 pdata = zforce_parse_dt(&client->dev); 736 if (IS_ERR(pdata)) 737 return PTR_ERR(pdata); 738 } 739 740 ts = devm_kzalloc(&client->dev, sizeof(struct zforce_ts), GFP_KERNEL); 741 if (!ts) 742 return -ENOMEM; 743 744 ts->gpio_rst = devm_gpiod_get_optional(&client->dev, "reset", 745 GPIOD_OUT_HIGH); 746 if (IS_ERR(ts->gpio_rst)) { 747 ret = PTR_ERR(ts->gpio_rst); 748 dev_err(&client->dev, 749 "failed to request reset GPIO: %d\n", ret); 750 return ret; 751 } 752 753 if (ts->gpio_rst) { 754 ts->gpio_int = devm_gpiod_get_optional(&client->dev, "irq", 755 GPIOD_IN); 756 if (IS_ERR(ts->gpio_int)) { 757 ret = PTR_ERR(ts->gpio_int); 758 dev_err(&client->dev, 759 "failed to request interrupt GPIO: %d\n", ret); 760 return ret; 761 } 762 } else { 763 /* 764 * Deprecated GPIO handling for compatibility 765 * with legacy binding. 766 */ 767 768 /* INT GPIO */ 769 ts->gpio_int = devm_gpiod_get_index(&client->dev, NULL, 0, 770 GPIOD_IN); 771 if (IS_ERR(ts->gpio_int)) { 772 ret = PTR_ERR(ts->gpio_int); 773 dev_err(&client->dev, 774 "failed to request interrupt GPIO: %d\n", ret); 775 return ret; 776 } 777 778 /* RST GPIO */ 779 ts->gpio_rst = devm_gpiod_get_index(&client->dev, NULL, 1, 780 GPIOD_OUT_HIGH); 781 if (IS_ERR(ts->gpio_rst)) { 782 ret = PTR_ERR(ts->gpio_rst); 783 dev_err(&client->dev, 784 "failed to request reset GPIO: %d\n", ret); 785 return ret; 786 } 787 } 788 789 ts->reg_vdd = devm_regulator_get_optional(&client->dev, "vdd"); 790 if (IS_ERR(ts->reg_vdd)) { 791 ret = PTR_ERR(ts->reg_vdd); 792 if (ret == -EPROBE_DEFER) 793 return ret; 794 } else { 795 ret = regulator_enable(ts->reg_vdd); 796 if (ret) 797 return ret; 798 799 /* 800 * according to datasheet add 100us grace time after regular 801 * regulator enable delay. 802 */ 803 udelay(100); 804 } 805 806 ret = devm_add_action(&client->dev, zforce_reset, ts); 807 if (ret) { 808 dev_err(&client->dev, "failed to register reset action, %d\n", 809 ret); 810 811 /* hereafter the regulator will be disabled by the action */ 812 if (!IS_ERR(ts->reg_vdd)) 813 regulator_disable(ts->reg_vdd); 814 815 return ret; 816 } 817 818 snprintf(ts->phys, sizeof(ts->phys), 819 "%s/input0", dev_name(&client->dev)); 820 821 input_dev = devm_input_allocate_device(&client->dev); 822 if (!input_dev) { 823 dev_err(&client->dev, "could not allocate input device\n"); 824 return -ENOMEM; 825 } 826 827 mutex_init(&ts->access_mutex); 828 mutex_init(&ts->command_mutex); 829 830 ts->pdata = pdata; 831 ts->client = client; 832 ts->input = input_dev; 833 834 input_dev->name = "Neonode zForce touchscreen"; 835 input_dev->phys = ts->phys; 836 input_dev->id.bustype = BUS_I2C; 837 838 input_dev->open = zforce_input_open; 839 input_dev->close = zforce_input_close; 840 841 __set_bit(EV_KEY, input_dev->evbit); 842 __set_bit(EV_SYN, input_dev->evbit); 843 __set_bit(EV_ABS, input_dev->evbit); 844 845 /* For multi touch */ 846 input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0, 847 pdata->x_max, 0, 0); 848 input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0, 849 pdata->y_max, 0, 0); 850 851 touchscreen_parse_properties(input_dev, true, &ts->prop); 852 if (ts->prop.max_x == 0 || ts->prop.max_y == 0) { 853 dev_err(&client->dev, "no size specified\n"); 854 return -EINVAL; 855 } 856 857 input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, 858 ZFORCE_MAX_AREA, 0, 0); 859 input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0, 860 ZFORCE_MAX_AREA, 0, 0); 861 input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0); 862 input_mt_init_slots(input_dev, ZFORCE_REPORT_POINTS, INPUT_MT_DIRECT); 863 864 input_set_drvdata(ts->input, ts); 865 866 init_completion(&ts->command_done); 867 868 /* 869 * The zforce pulls the interrupt low when it has data ready. 870 * After it is triggered the isr thread runs until all the available 871 * packets have been read and the interrupt is high again. 872 * Therefore we can trigger the interrupt anytime it is low and do 873 * not need to limit it to the interrupt edge. 874 */ 875 ret = devm_request_threaded_irq(&client->dev, client->irq, 876 zforce_irq, zforce_irq_thread, 877 IRQF_TRIGGER_LOW | IRQF_ONESHOT, 878 input_dev->name, ts); 879 if (ret) { 880 dev_err(&client->dev, "irq %d request failed\n", client->irq); 881 return ret; 882 } 883 884 i2c_set_clientdata(client, ts); 885 886 /* let the controller boot */ 887 zforce_reset_deassert(ts); 888 889 ts->command_waiting = NOTIFICATION_BOOTCOMPLETE; 890 if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0) 891 dev_warn(&client->dev, "bootcomplete timed out\n"); 892 893 /* need to start device to get version information */ 894 ret = zforce_command_wait(ts, COMMAND_INITIALIZE); 895 if (ret) { 896 dev_err(&client->dev, "unable to initialize, %d\n", ret); 897 return ret; 898 } 899 900 /* this gets the firmware version among other information */ 901 ret = zforce_command_wait(ts, COMMAND_STATUS); 902 if (ret < 0) { 903 dev_err(&client->dev, "couldn't get status, %d\n", ret); 904 zforce_stop(ts); 905 return ret; 906 } 907 908 /* stop device and put it into sleep until it is opened */ 909 ret = zforce_stop(ts); 910 if (ret < 0) 911 return ret; 912 913 device_set_wakeup_capable(&client->dev, true); 914 915 ret = input_register_device(input_dev); 916 if (ret) { 917 dev_err(&client->dev, "could not register input device, %d\n", 918 ret); 919 return ret; 920 } 921 922 return 0; 923} 924 925static struct i2c_device_id zforce_idtable[] = { 926 { "zforce-ts", 0 }, 927 { } 928}; 929MODULE_DEVICE_TABLE(i2c, zforce_idtable); 930 931#ifdef CONFIG_OF 932static const struct of_device_id zforce_dt_idtable[] = { 933 { .compatible = "neonode,zforce" }, 934 {}, 935}; 936MODULE_DEVICE_TABLE(of, zforce_dt_idtable); 937#endif 938 939static struct i2c_driver zforce_driver = { 940 .driver = { 941 .name = "zforce-ts", 942 .pm = pm_sleep_ptr(&zforce_pm_ops), 943 .of_match_table = of_match_ptr(zforce_dt_idtable), 944 }, 945 .probe = zforce_probe, 946 .id_table = zforce_idtable, 947}; 948 949module_i2c_driver(zforce_driver); 950 951MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>"); 952MODULE_DESCRIPTION("zForce TouchScreen Driver"); 953MODULE_LICENSE("GPL"); 954