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