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