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 if (zforce_setconfig(ts, SETCONFIG_DUALTOUCH)) { 283 dev_err(&client->dev, "Unable to set config\n"); 284 goto error; 285 } 286 287 /* start sending touch events */ 288 ret = zforce_command(ts, COMMAND_DATAREQUEST); 289 if (ret) { 290 dev_err(&client->dev, "Unable to request data\n"); 291 goto error; 292 } 293 294 /* 295 * Per NN, initial cal. take max. of 200msec. 296 * Allow time to complete this calibration 297 */ 298 msleep(200); 299 300 return 0; 301 302 error: 303 zforce_command_wait(ts, COMMAND_DEACTIVATE); 304 return ret; 305 } 306 307 static int zforce_stop(struct zforce_ts *ts) 308 { 309 struct i2c_client *client = ts->client; 310 int ret; 311 312 dev_dbg(&client->dev, "stopping device\n"); 313 314 /* Deactivates touch sensing and puts the device into sleep. */ 315 ret = zforce_command_wait(ts, COMMAND_DEACTIVATE); 316 if (ret != 0) { 317 dev_err(&client->dev, "could not deactivate device, %d\n", 318 ret); 319 return ret; 320 } 321 322 return 0; 323 } 324 325 static int zforce_touch_event(struct zforce_ts *ts, u8 *payload) 326 { 327 struct i2c_client *client = ts->client; 328 const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev); 329 struct zforce_point point; 330 int count, i, num = 0; 331 332 count = payload[0]; 333 if (count > ZFORCE_REPORT_POINTS) { 334 dev_warn(&client->dev, "to many coordinates %d, expected max %d\n", 335 count, ZFORCE_REPORT_POINTS); 336 count = ZFORCE_REPORT_POINTS; 337 } 338 339 for (i = 0; i < count; i++) { 340 point.coord_x = 341 payload[9 * i + 2] << 8 | payload[9 * i + 1]; 342 point.coord_y = 343 payload[9 * i + 4] << 8 | payload[9 * i + 3]; 344 345 if (point.coord_x > pdata->x_max || 346 point.coord_y > pdata->y_max) { 347 dev_warn(&client->dev, "coordinates (%d,%d) invalid\n", 348 point.coord_x, point.coord_y); 349 point.coord_x = point.coord_y = 0; 350 } 351 352 point.state = payload[9 * i + 5] & 0x03; 353 point.id = (payload[9 * i + 5] & 0xfc) >> 2; 354 355 /* determine touch major, minor and orientation */ 356 point.area_major = max(payload[9 * i + 6], 357 payload[9 * i + 7]); 358 point.area_minor = min(payload[9 * i + 6], 359 payload[9 * i + 7]); 360 point.orientation = payload[9 * i + 6] > payload[9 * i + 7]; 361 362 point.pressure = payload[9 * i + 8]; 363 point.prblty = payload[9 * i + 9]; 364 365 dev_dbg(&client->dev, 366 "point %d/%d: state %d, id %d, pressure %d, prblty %d, x %d, y %d, amajor %d, aminor %d, ori %d\n", 367 i, count, point.state, point.id, 368 point.pressure, point.prblty, 369 point.coord_x, point.coord_y, 370 point.area_major, point.area_minor, 371 point.orientation); 372 373 /* the zforce id starts with "1", so needs to be decreased */ 374 input_mt_slot(ts->input, point.id - 1); 375 376 input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, 377 point.state != STATE_UP); 378 379 if (point.state != STATE_UP) { 380 input_report_abs(ts->input, ABS_MT_POSITION_X, 381 point.coord_x); 382 input_report_abs(ts->input, ABS_MT_POSITION_Y, 383 point.coord_y); 384 input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, 385 point.area_major); 386 input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, 387 point.area_minor); 388 input_report_abs(ts->input, ABS_MT_ORIENTATION, 389 point.orientation); 390 num++; 391 } 392 } 393 394 input_mt_sync_frame(ts->input); 395 396 input_mt_report_finger_count(ts->input, num); 397 398 input_sync(ts->input); 399 400 return 0; 401 } 402 403 static int zforce_read_packet(struct zforce_ts *ts, u8 *buf) 404 { 405 struct i2c_client *client = ts->client; 406 int ret; 407 408 mutex_lock(&ts->access_mutex); 409 410 /* read 2 byte message header */ 411 ret = i2c_master_recv(client, buf, 2); 412 if (ret < 0) { 413 dev_err(&client->dev, "error reading header: %d\n", ret); 414 goto unlock; 415 } 416 417 if (buf[PAYLOAD_HEADER] != FRAME_START) { 418 dev_err(&client->dev, "invalid frame start: %d\n", buf[0]); 419 ret = -EIO; 420 goto unlock; 421 } 422 423 if (buf[PAYLOAD_LENGTH] <= 0 || buf[PAYLOAD_LENGTH] > 255) { 424 dev_err(&client->dev, "invalid payload length: %d\n", 425 buf[PAYLOAD_LENGTH]); 426 ret = -EIO; 427 goto unlock; 428 } 429 430 /* read the message */ 431 ret = i2c_master_recv(client, &buf[PAYLOAD_BODY], buf[PAYLOAD_LENGTH]); 432 if (ret < 0) { 433 dev_err(&client->dev, "error reading payload: %d\n", ret); 434 goto unlock; 435 } 436 437 dev_dbg(&client->dev, "read %d bytes for response command 0x%x\n", 438 buf[PAYLOAD_LENGTH], buf[PAYLOAD_BODY]); 439 440 unlock: 441 mutex_unlock(&ts->access_mutex); 442 return ret; 443 } 444 445 static void zforce_complete(struct zforce_ts *ts, int cmd, int result) 446 { 447 struct i2c_client *client = ts->client; 448 449 if (ts->command_waiting == cmd) { 450 dev_dbg(&client->dev, "completing command 0x%x\n", cmd); 451 ts->command_result = result; 452 complete(&ts->command_done); 453 } else { 454 dev_dbg(&client->dev, "command %d not for us\n", cmd); 455 } 456 } 457 458 static irqreturn_t zforce_irq(int irq, void *dev_id) 459 { 460 struct zforce_ts *ts = dev_id; 461 struct i2c_client *client = ts->client; 462 463 if (ts->suspended && device_may_wakeup(&client->dev)) 464 pm_wakeup_event(&client->dev, 500); 465 466 return IRQ_WAKE_THREAD; 467 } 468 469 static irqreturn_t zforce_irq_thread(int irq, void *dev_id) 470 { 471 struct zforce_ts *ts = dev_id; 472 struct i2c_client *client = ts->client; 473 const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev); 474 int ret; 475 u8 payload_buffer[512]; 476 u8 *payload; 477 478 /* 479 * When still suspended, return. 480 * Due to the level-interrupt we will get re-triggered later. 481 */ 482 if (ts->suspended) { 483 msleep(20); 484 return IRQ_HANDLED; 485 } 486 487 dev_dbg(&client->dev, "handling interrupt\n"); 488 489 /* Don't emit wakeup events from commands run by zforce_suspend */ 490 if (!ts->suspending && device_may_wakeup(&client->dev)) 491 pm_stay_awake(&client->dev); 492 493 while (!gpio_get_value(pdata->gpio_int)) { 494 ret = zforce_read_packet(ts, payload_buffer); 495 if (ret < 0) { 496 dev_err(&client->dev, "could not read packet, ret: %d\n", 497 ret); 498 break; 499 } 500 501 payload = &payload_buffer[PAYLOAD_BODY]; 502 503 switch (payload[RESPONSE_ID]) { 504 case NOTIFICATION_TOUCH: 505 /* 506 * Always report touch-events received while 507 * suspending, when being a wakeup source 508 */ 509 if (ts->suspending && device_may_wakeup(&client->dev)) 510 pm_wakeup_event(&client->dev, 500); 511 zforce_touch_event(ts, &payload[RESPONSE_DATA]); 512 break; 513 514 case NOTIFICATION_BOOTCOMPLETE: 515 ts->boot_complete = payload[RESPONSE_DATA]; 516 zforce_complete(ts, payload[RESPONSE_ID], 0); 517 break; 518 519 case RESPONSE_INITIALIZE: 520 case RESPONSE_DEACTIVATE: 521 case RESPONSE_SETCONFIG: 522 case RESPONSE_RESOLUTION: 523 case RESPONSE_SCANFREQ: 524 zforce_complete(ts, payload[RESPONSE_ID], 525 payload[RESPONSE_DATA]); 526 break; 527 528 case RESPONSE_STATUS: 529 /* 530 * Version Payload Results 531 * [2:major] [2:minor] [2:build] [2:rev] 532 */ 533 ts->version_major = (payload[RESPONSE_DATA + 1] << 8) | 534 payload[RESPONSE_DATA]; 535 ts->version_minor = (payload[RESPONSE_DATA + 3] << 8) | 536 payload[RESPONSE_DATA + 2]; 537 ts->version_build = (payload[RESPONSE_DATA + 5] << 8) | 538 payload[RESPONSE_DATA + 4]; 539 ts->version_rev = (payload[RESPONSE_DATA + 7] << 8) | 540 payload[RESPONSE_DATA + 6]; 541 dev_dbg(&ts->client->dev, "Firmware Version %04x:%04x %04x:%04x\n", 542 ts->version_major, ts->version_minor, 543 ts->version_build, ts->version_rev); 544 545 zforce_complete(ts, payload[RESPONSE_ID], 0); 546 break; 547 548 case NOTIFICATION_INVALID_COMMAND: 549 dev_err(&ts->client->dev, "invalid command: 0x%x\n", 550 payload[RESPONSE_DATA]); 551 break; 552 553 default: 554 dev_err(&ts->client->dev, "unrecognized response id: 0x%x\n", 555 payload[RESPONSE_ID]); 556 break; 557 } 558 } 559 560 if (!ts->suspending && device_may_wakeup(&client->dev)) 561 pm_relax(&client->dev); 562 563 dev_dbg(&client->dev, "finished interrupt\n"); 564 565 return IRQ_HANDLED; 566 } 567 568 static int zforce_input_open(struct input_dev *dev) 569 { 570 struct zforce_ts *ts = input_get_drvdata(dev); 571 int ret; 572 573 ret = zforce_start(ts); 574 if (ret) 575 return ret; 576 577 return 0; 578 } 579 580 static void zforce_input_close(struct input_dev *dev) 581 { 582 struct zforce_ts *ts = input_get_drvdata(dev); 583 struct i2c_client *client = ts->client; 584 int ret; 585 586 ret = zforce_stop(ts); 587 if (ret) 588 dev_warn(&client->dev, "stopping zforce failed\n"); 589 590 return; 591 } 592 593 #ifdef CONFIG_PM_SLEEP 594 static int zforce_suspend(struct device *dev) 595 { 596 struct i2c_client *client = to_i2c_client(dev); 597 struct zforce_ts *ts = i2c_get_clientdata(client); 598 struct input_dev *input = ts->input; 599 int ret = 0; 600 601 mutex_lock(&input->mutex); 602 ts->suspending = true; 603 604 /* 605 * When configured as a wakeup source device should always wake 606 * the system, therefore start device if necessary. 607 */ 608 if (device_may_wakeup(&client->dev)) { 609 dev_dbg(&client->dev, "suspend while being a wakeup source\n"); 610 611 /* Need to start device, if not open, to be a wakeup source. */ 612 if (!input->users) { 613 ret = zforce_start(ts); 614 if (ret) 615 goto unlock; 616 } 617 618 enable_irq_wake(client->irq); 619 } else if (input->users) { 620 dev_dbg(&client->dev, "suspend without being a wakeup source\n"); 621 622 ret = zforce_stop(ts); 623 if (ret) 624 goto unlock; 625 626 disable_irq(client->irq); 627 } 628 629 ts->suspended = true; 630 631 unlock: 632 ts->suspending = false; 633 mutex_unlock(&input->mutex); 634 635 return ret; 636 } 637 638 static int zforce_resume(struct device *dev) 639 { 640 struct i2c_client *client = to_i2c_client(dev); 641 struct zforce_ts *ts = i2c_get_clientdata(client); 642 struct input_dev *input = ts->input; 643 int ret = 0; 644 645 mutex_lock(&input->mutex); 646 647 ts->suspended = false; 648 649 if (device_may_wakeup(&client->dev)) { 650 dev_dbg(&client->dev, "resume from being a wakeup source\n"); 651 652 disable_irq_wake(client->irq); 653 654 /* need to stop device if it was not open on suspend */ 655 if (!input->users) { 656 ret = zforce_stop(ts); 657 if (ret) 658 goto unlock; 659 } 660 } else if (input->users) { 661 dev_dbg(&client->dev, "resume without being a wakeup source\n"); 662 663 enable_irq(client->irq); 664 665 ret = zforce_start(ts); 666 if (ret < 0) 667 goto unlock; 668 } 669 670 unlock: 671 mutex_unlock(&input->mutex); 672 673 return ret; 674 } 675 #endif 676 677 static SIMPLE_DEV_PM_OPS(zforce_pm_ops, zforce_suspend, zforce_resume); 678 679 static void zforce_reset(void *data) 680 { 681 struct zforce_ts *ts = data; 682 683 gpio_set_value(ts->pdata->gpio_rst, 0); 684 } 685 686 static int zforce_probe(struct i2c_client *client, 687 const struct i2c_device_id *id) 688 { 689 const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev); 690 struct zforce_ts *ts; 691 struct input_dev *input_dev; 692 int ret; 693 694 if (!pdata) 695 return -EINVAL; 696 697 ts = devm_kzalloc(&client->dev, sizeof(struct zforce_ts), GFP_KERNEL); 698 if (!ts) 699 return -ENOMEM; 700 701 ret = devm_gpio_request_one(&client->dev, pdata->gpio_int, GPIOF_IN, 702 "zforce_ts_int"); 703 if (ret) { 704 dev_err(&client->dev, "request of gpio %d failed, %d\n", 705 pdata->gpio_int, ret); 706 return ret; 707 } 708 709 ret = devm_gpio_request_one(&client->dev, pdata->gpio_rst, 710 GPIOF_OUT_INIT_LOW, "zforce_ts_rst"); 711 if (ret) { 712 dev_err(&client->dev, "request of gpio %d failed, %d\n", 713 pdata->gpio_rst, ret); 714 return ret; 715 } 716 717 ret = devm_add_action(&client->dev, zforce_reset, ts); 718 if (ret) { 719 dev_err(&client->dev, "failed to register reset action, %d\n", 720 ret); 721 return ret; 722 } 723 724 snprintf(ts->phys, sizeof(ts->phys), 725 "%s/input0", dev_name(&client->dev)); 726 727 input_dev = devm_input_allocate_device(&client->dev); 728 if (!input_dev) { 729 dev_err(&client->dev, "could not allocate input device\n"); 730 return -ENOMEM; 731 } 732 733 mutex_init(&ts->access_mutex); 734 mutex_init(&ts->command_mutex); 735 736 ts->pdata = pdata; 737 ts->client = client; 738 ts->input = input_dev; 739 740 input_dev->name = "Neonode zForce touchscreen"; 741 input_dev->phys = ts->phys; 742 input_dev->id.bustype = BUS_I2C; 743 744 input_dev->open = zforce_input_open; 745 input_dev->close = zforce_input_close; 746 747 __set_bit(EV_KEY, input_dev->evbit); 748 __set_bit(EV_SYN, input_dev->evbit); 749 __set_bit(EV_ABS, input_dev->evbit); 750 751 /* For multi touch */ 752 input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0, 753 pdata->x_max, 0, 0); 754 input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0, 755 pdata->y_max, 0, 0); 756 757 input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, 758 ZFORCE_MAX_AREA, 0, 0); 759 input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0, 760 ZFORCE_MAX_AREA, 0, 0); 761 input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0); 762 input_mt_init_slots(input_dev, ZFORCE_REPORT_POINTS, INPUT_MT_DIRECT); 763 764 input_set_drvdata(ts->input, ts); 765 766 init_completion(&ts->command_done); 767 768 /* 769 * The zforce pulls the interrupt low when it has data ready. 770 * After it is triggered the isr thread runs until all the available 771 * packets have been read and the interrupt is high again. 772 * Therefore we can trigger the interrupt anytime it is low and do 773 * not need to limit it to the interrupt edge. 774 */ 775 ret = devm_request_threaded_irq(&client->dev, client->irq, 776 zforce_irq, zforce_irq_thread, 777 IRQF_TRIGGER_LOW | IRQF_ONESHOT, 778 input_dev->name, ts); 779 if (ret) { 780 dev_err(&client->dev, "irq %d request failed\n", client->irq); 781 return ret; 782 } 783 784 i2c_set_clientdata(client, ts); 785 786 /* let the controller boot */ 787 gpio_set_value(pdata->gpio_rst, 1); 788 789 ts->command_waiting = NOTIFICATION_BOOTCOMPLETE; 790 if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0) 791 dev_warn(&client->dev, "bootcomplete timed out\n"); 792 793 /* need to start device to get version information */ 794 ret = zforce_command_wait(ts, COMMAND_INITIALIZE); 795 if (ret) { 796 dev_err(&client->dev, "unable to initialize, %d\n", ret); 797 return ret; 798 } 799 800 /* this gets the firmware version among other informations */ 801 ret = zforce_command_wait(ts, COMMAND_STATUS); 802 if (ret < 0) { 803 dev_err(&client->dev, "couldn't get status, %d\n", ret); 804 zforce_stop(ts); 805 return ret; 806 } 807 808 /* stop device and put it into sleep until it is opened */ 809 ret = zforce_stop(ts); 810 if (ret < 0) 811 return ret; 812 813 device_set_wakeup_capable(&client->dev, true); 814 815 ret = input_register_device(input_dev); 816 if (ret) { 817 dev_err(&client->dev, "could not register input device, %d\n", 818 ret); 819 return ret; 820 } 821 822 return 0; 823 } 824 825 static struct i2c_device_id zforce_idtable[] = { 826 { "zforce-ts", 0 }, 827 { } 828 }; 829 MODULE_DEVICE_TABLE(i2c, zforce_idtable); 830 831 static struct i2c_driver zforce_driver = { 832 .driver = { 833 .owner = THIS_MODULE, 834 .name = "zforce-ts", 835 .pm = &zforce_pm_ops, 836 }, 837 .probe = zforce_probe, 838 .id_table = zforce_idtable, 839 }; 840 841 module_i2c_driver(zforce_driver); 842 843 MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>"); 844 MODULE_DESCRIPTION("zForce TouchScreen Driver"); 845 MODULE_LICENSE("GPL"); 846