1 // SPDX-License-Identifier: GPL-2.0 2 // STMicroelectronics FTS Touchscreen device driver 3 // 4 // Copyright (c) 2017 Samsung Electronics Co., Ltd. 5 // Copyright (c) 2017 Andi Shyti <andi@etezian.org> 6 7 #include <linux/delay.h> 8 #include <linux/i2c.h> 9 #include <linux/input/mt.h> 10 #include <linux/input/touchscreen.h> 11 #include <linux/interrupt.h> 12 #include <linux/irq.h> 13 #include <linux/leds.h> 14 #include <linux/module.h> 15 #include <linux/pm_runtime.h> 16 #include <linux/regulator/consumer.h> 17 18 /* I2C commands */ 19 #define STMFTS_READ_INFO 0x80 20 #define STMFTS_READ_STATUS 0x84 21 #define STMFTS_READ_ONE_EVENT 0x85 22 #define STMFTS_READ_ALL_EVENT 0x86 23 #define STMFTS_LATEST_EVENT 0x87 24 #define STMFTS_SLEEP_IN 0x90 25 #define STMFTS_SLEEP_OUT 0x91 26 #define STMFTS_MS_MT_SENSE_OFF 0x92 27 #define STMFTS_MS_MT_SENSE_ON 0x93 28 #define STMFTS_SS_HOVER_SENSE_OFF 0x94 29 #define STMFTS_SS_HOVER_SENSE_ON 0x95 30 #define STMFTS_MS_KEY_SENSE_OFF 0x9a 31 #define STMFTS_MS_KEY_SENSE_ON 0x9b 32 #define STMFTS_SYSTEM_RESET 0xa0 33 #define STMFTS_CLEAR_EVENT_STACK 0xa1 34 #define STMFTS_FULL_FORCE_CALIBRATION 0xa2 35 #define STMFTS_MS_CX_TUNING 0xa3 36 #define STMFTS_SS_CX_TUNING 0xa4 37 38 /* events */ 39 #define STMFTS_EV_NO_EVENT 0x00 40 #define STMFTS_EV_MULTI_TOUCH_DETECTED 0x02 41 #define STMFTS_EV_MULTI_TOUCH_ENTER 0x03 42 #define STMFTS_EV_MULTI_TOUCH_LEAVE 0x04 43 #define STMFTS_EV_MULTI_TOUCH_MOTION 0x05 44 #define STMFTS_EV_HOVER_ENTER 0x07 45 #define STMFTS_EV_HOVER_LEAVE 0x08 46 #define STMFTS_EV_HOVER_MOTION 0x09 47 #define STMFTS_EV_KEY_STATUS 0x0e 48 #define STMFTS_EV_ERROR 0x0f 49 #define STMFTS_EV_CONTROLLER_READY 0x10 50 #define STMFTS_EV_SLEEP_OUT_CONTROLLER_READY 0x11 51 #define STMFTS_EV_STATUS 0x16 52 #define STMFTS_EV_DEBUG 0xdb 53 54 /* multi touch related event masks */ 55 #define STMFTS_MASK_EVENT_ID 0x0f 56 #define STMFTS_MASK_TOUCH_ID 0xf0 57 #define STMFTS_MASK_LEFT_EVENT 0x0f 58 #define STMFTS_MASK_X_MSB 0x0f 59 #define STMFTS_MASK_Y_LSB 0xf0 60 61 /* key related event masks */ 62 #define STMFTS_MASK_KEY_NO_TOUCH 0x00 63 #define STMFTS_MASK_KEY_MENU 0x01 64 #define STMFTS_MASK_KEY_BACK 0x02 65 66 #define STMFTS_EVENT_SIZE 8 67 #define STMFTS_STACK_DEPTH 32 68 #define STMFTS_DATA_MAX_SIZE (STMFTS_EVENT_SIZE * STMFTS_STACK_DEPTH) 69 #define STMFTS_MAX_FINGERS 10 70 #define STMFTS_DEV_NAME "stmfts" 71 72 enum stmfts_regulators { 73 STMFTS_REGULATOR_VDD, 74 STMFTS_REGULATOR_AVDD, 75 }; 76 77 struct stmfts_data { 78 struct i2c_client *client; 79 struct input_dev *input; 80 struct led_classdev led_cdev; 81 struct mutex mutex; 82 83 struct touchscreen_properties prop; 84 85 struct regulator_bulk_data regulators[2]; 86 87 /* 88 * Presence of ledvdd will be used also to check 89 * whether the LED is supported. 90 */ 91 struct regulator *ledvdd; 92 93 u16 chip_id; 94 u8 chip_ver; 95 u16 fw_ver; 96 u8 config_id; 97 u8 config_ver; 98 99 u8 data[STMFTS_DATA_MAX_SIZE]; 100 101 struct completion cmd_done; 102 103 bool use_key; 104 bool led_status; 105 bool hover_enabled; 106 bool running; 107 }; 108 109 static int stmfts_brightness_set(struct led_classdev *led_cdev, 110 enum led_brightness value) 111 { 112 struct stmfts_data *sdata = container_of(led_cdev, 113 struct stmfts_data, led_cdev); 114 int err; 115 116 if (value != sdata->led_status && sdata->ledvdd) { 117 if (!value) { 118 regulator_disable(sdata->ledvdd); 119 } else { 120 err = regulator_enable(sdata->ledvdd); 121 if (err) { 122 dev_warn(&sdata->client->dev, 123 "failed to disable ledvdd regulator: %d\n", 124 err); 125 return err; 126 } 127 } 128 sdata->led_status = value; 129 } 130 131 return 0; 132 } 133 134 static enum led_brightness stmfts_brightness_get(struct led_classdev *led_cdev) 135 { 136 struct stmfts_data *sdata = container_of(led_cdev, 137 struct stmfts_data, led_cdev); 138 139 return !!regulator_is_enabled(sdata->ledvdd); 140 } 141 142 /* 143 * We can't simply use i2c_smbus_read_i2c_block_data because we 144 * need to read more than 255 bytes ( 145 */ 146 static int stmfts_read_events(struct stmfts_data *sdata) 147 { 148 u8 cmd = STMFTS_READ_ALL_EVENT; 149 struct i2c_msg msgs[2] = { 150 { 151 .addr = sdata->client->addr, 152 .len = 1, 153 .buf = &cmd, 154 }, 155 { 156 .addr = sdata->client->addr, 157 .flags = I2C_M_RD, 158 .len = STMFTS_DATA_MAX_SIZE, 159 .buf = sdata->data, 160 }, 161 }; 162 int ret; 163 164 ret = i2c_transfer(sdata->client->adapter, msgs, ARRAY_SIZE(msgs)); 165 if (ret < 0) 166 return ret; 167 168 return ret == ARRAY_SIZE(msgs) ? 0 : -EIO; 169 } 170 171 static void stmfts_report_contact_event(struct stmfts_data *sdata, 172 const u8 event[]) 173 { 174 u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4; 175 u16 x = event[1] | ((event[2] & STMFTS_MASK_X_MSB) << 8); 176 u16 y = (event[2] >> 4) | (event[3] << 4); 177 u8 maj = event[4]; 178 u8 min = event[5]; 179 u8 orientation = event[6]; 180 u8 area = event[7]; 181 182 input_mt_slot(sdata->input, slot_id); 183 184 input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, true); 185 input_report_abs(sdata->input, ABS_MT_POSITION_X, x); 186 input_report_abs(sdata->input, ABS_MT_POSITION_Y, y); 187 input_report_abs(sdata->input, ABS_MT_TOUCH_MAJOR, maj); 188 input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, min); 189 input_report_abs(sdata->input, ABS_MT_PRESSURE, area); 190 input_report_abs(sdata->input, ABS_MT_ORIENTATION, orientation); 191 192 input_sync(sdata->input); 193 } 194 195 static void stmfts_report_contact_release(struct stmfts_data *sdata, 196 const u8 event[]) 197 { 198 u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4; 199 200 input_mt_slot(sdata->input, slot_id); 201 input_mt_report_slot_inactive(sdata->input); 202 203 input_sync(sdata->input); 204 } 205 206 static void stmfts_report_hover_event(struct stmfts_data *sdata, 207 const u8 event[]) 208 { 209 u16 x = (event[2] << 4) | (event[4] >> 4); 210 u16 y = (event[3] << 4) | (event[4] & STMFTS_MASK_Y_LSB); 211 u8 z = event[5]; 212 213 input_report_abs(sdata->input, ABS_X, x); 214 input_report_abs(sdata->input, ABS_Y, y); 215 input_report_abs(sdata->input, ABS_DISTANCE, z); 216 217 input_sync(sdata->input); 218 } 219 220 static void stmfts_report_key_event(struct stmfts_data *sdata, const u8 event[]) 221 { 222 switch (event[2]) { 223 case 0: 224 input_report_key(sdata->input, KEY_BACK, 0); 225 input_report_key(sdata->input, KEY_MENU, 0); 226 break; 227 228 case STMFTS_MASK_KEY_BACK: 229 input_report_key(sdata->input, KEY_BACK, 1); 230 break; 231 232 case STMFTS_MASK_KEY_MENU: 233 input_report_key(sdata->input, KEY_MENU, 1); 234 break; 235 236 default: 237 dev_warn(&sdata->client->dev, 238 "unknown key event: %#02x\n", event[2]); 239 break; 240 } 241 242 input_sync(sdata->input); 243 } 244 245 static void stmfts_parse_events(struct stmfts_data *sdata) 246 { 247 int i; 248 249 for (i = 0; i < STMFTS_STACK_DEPTH; i++) { 250 u8 *event = &sdata->data[i * STMFTS_EVENT_SIZE]; 251 252 switch (event[0]) { 253 254 case STMFTS_EV_CONTROLLER_READY: 255 case STMFTS_EV_SLEEP_OUT_CONTROLLER_READY: 256 case STMFTS_EV_STATUS: 257 complete(&sdata->cmd_done); 258 fallthrough; 259 260 case STMFTS_EV_NO_EVENT: 261 case STMFTS_EV_DEBUG: 262 return; 263 } 264 265 switch (event[0] & STMFTS_MASK_EVENT_ID) { 266 267 case STMFTS_EV_MULTI_TOUCH_ENTER: 268 case STMFTS_EV_MULTI_TOUCH_MOTION: 269 stmfts_report_contact_event(sdata, event); 270 break; 271 272 case STMFTS_EV_MULTI_TOUCH_LEAVE: 273 stmfts_report_contact_release(sdata, event); 274 break; 275 276 case STMFTS_EV_HOVER_ENTER: 277 case STMFTS_EV_HOVER_LEAVE: 278 case STMFTS_EV_HOVER_MOTION: 279 stmfts_report_hover_event(sdata, event); 280 break; 281 282 case STMFTS_EV_KEY_STATUS: 283 stmfts_report_key_event(sdata, event); 284 break; 285 286 case STMFTS_EV_ERROR: 287 dev_warn(&sdata->client->dev, 288 "error code: 0x%x%x%x%x%x%x", 289 event[6], event[5], event[4], 290 event[3], event[2], event[1]); 291 break; 292 293 default: 294 dev_err(&sdata->client->dev, 295 "unknown event %#02x\n", event[0]); 296 } 297 } 298 } 299 300 static irqreturn_t stmfts_irq_handler(int irq, void *dev) 301 { 302 struct stmfts_data *sdata = dev; 303 int err; 304 305 mutex_lock(&sdata->mutex); 306 307 err = stmfts_read_events(sdata); 308 if (unlikely(err)) 309 dev_err(&sdata->client->dev, 310 "failed to read events: %d\n", err); 311 else 312 stmfts_parse_events(sdata); 313 314 mutex_unlock(&sdata->mutex); 315 return IRQ_HANDLED; 316 } 317 318 static int stmfts_command(struct stmfts_data *sdata, const u8 cmd) 319 { 320 int err; 321 322 reinit_completion(&sdata->cmd_done); 323 324 err = i2c_smbus_write_byte(sdata->client, cmd); 325 if (err) 326 return err; 327 328 if (!wait_for_completion_timeout(&sdata->cmd_done, 329 msecs_to_jiffies(1000))) 330 return -ETIMEDOUT; 331 332 return 0; 333 } 334 335 static int stmfts_input_open(struct input_dev *dev) 336 { 337 struct stmfts_data *sdata = input_get_drvdata(dev); 338 int err; 339 340 err = pm_runtime_resume_and_get(&sdata->client->dev); 341 if (err) 342 return err; 343 344 err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_ON); 345 if (err) { 346 pm_runtime_put_sync(&sdata->client->dev); 347 return err; 348 } 349 350 mutex_lock(&sdata->mutex); 351 sdata->running = true; 352 353 if (sdata->hover_enabled) { 354 err = i2c_smbus_write_byte(sdata->client, 355 STMFTS_SS_HOVER_SENSE_ON); 356 if (err) 357 dev_warn(&sdata->client->dev, 358 "failed to enable hover\n"); 359 } 360 mutex_unlock(&sdata->mutex); 361 362 if (sdata->use_key) { 363 err = i2c_smbus_write_byte(sdata->client, 364 STMFTS_MS_KEY_SENSE_ON); 365 if (err) 366 /* I can still use only the touch screen */ 367 dev_warn(&sdata->client->dev, 368 "failed to enable touchkey\n"); 369 } 370 371 return 0; 372 } 373 374 static void stmfts_input_close(struct input_dev *dev) 375 { 376 struct stmfts_data *sdata = input_get_drvdata(dev); 377 int err; 378 379 err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_OFF); 380 if (err) 381 dev_warn(&sdata->client->dev, 382 "failed to disable touchscreen: %d\n", err); 383 384 mutex_lock(&sdata->mutex); 385 386 sdata->running = false; 387 388 if (sdata->hover_enabled) { 389 err = i2c_smbus_write_byte(sdata->client, 390 STMFTS_SS_HOVER_SENSE_OFF); 391 if (err) 392 dev_warn(&sdata->client->dev, 393 "failed to disable hover: %d\n", err); 394 } 395 mutex_unlock(&sdata->mutex); 396 397 if (sdata->use_key) { 398 err = i2c_smbus_write_byte(sdata->client, 399 STMFTS_MS_KEY_SENSE_OFF); 400 if (err) 401 dev_warn(&sdata->client->dev, 402 "failed to disable touchkey: %d\n", err); 403 } 404 405 pm_runtime_put_sync(&sdata->client->dev); 406 } 407 408 static ssize_t stmfts_sysfs_chip_id(struct device *dev, 409 struct device_attribute *attr, char *buf) 410 { 411 struct stmfts_data *sdata = dev_get_drvdata(dev); 412 413 return sprintf(buf, "%#x\n", sdata->chip_id); 414 } 415 416 static ssize_t stmfts_sysfs_chip_version(struct device *dev, 417 struct device_attribute *attr, char *buf) 418 { 419 struct stmfts_data *sdata = dev_get_drvdata(dev); 420 421 return sprintf(buf, "%u\n", sdata->chip_ver); 422 } 423 424 static ssize_t stmfts_sysfs_fw_ver(struct device *dev, 425 struct device_attribute *attr, char *buf) 426 { 427 struct stmfts_data *sdata = dev_get_drvdata(dev); 428 429 return sprintf(buf, "%u\n", sdata->fw_ver); 430 } 431 432 static ssize_t stmfts_sysfs_config_id(struct device *dev, 433 struct device_attribute *attr, char *buf) 434 { 435 struct stmfts_data *sdata = dev_get_drvdata(dev); 436 437 return sprintf(buf, "%#x\n", sdata->config_id); 438 } 439 440 static ssize_t stmfts_sysfs_config_version(struct device *dev, 441 struct device_attribute *attr, char *buf) 442 { 443 struct stmfts_data *sdata = dev_get_drvdata(dev); 444 445 return sprintf(buf, "%u\n", sdata->config_ver); 446 } 447 448 static ssize_t stmfts_sysfs_read_status(struct device *dev, 449 struct device_attribute *attr, char *buf) 450 { 451 struct stmfts_data *sdata = dev_get_drvdata(dev); 452 u8 status[4]; 453 int err; 454 455 err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_STATUS, 456 sizeof(status), status); 457 if (err) 458 return err; 459 460 return sprintf(buf, "%#02x\n", status[0]); 461 } 462 463 static ssize_t stmfts_sysfs_hover_enable_read(struct device *dev, 464 struct device_attribute *attr, char *buf) 465 { 466 struct stmfts_data *sdata = dev_get_drvdata(dev); 467 468 return sprintf(buf, "%u\n", sdata->hover_enabled); 469 } 470 471 static ssize_t stmfts_sysfs_hover_enable_write(struct device *dev, 472 struct device_attribute *attr, 473 const char *buf, size_t len) 474 { 475 struct stmfts_data *sdata = dev_get_drvdata(dev); 476 unsigned long value; 477 int err = 0; 478 479 if (kstrtoul(buf, 0, &value)) 480 return -EINVAL; 481 482 mutex_lock(&sdata->mutex); 483 484 if (value && sdata->hover_enabled) 485 goto out; 486 487 if (sdata->running) 488 err = i2c_smbus_write_byte(sdata->client, 489 value ? STMFTS_SS_HOVER_SENSE_ON : 490 STMFTS_SS_HOVER_SENSE_OFF); 491 492 if (!err) 493 sdata->hover_enabled = !!value; 494 495 out: 496 mutex_unlock(&sdata->mutex); 497 498 return len; 499 } 500 501 static DEVICE_ATTR(chip_id, 0444, stmfts_sysfs_chip_id, NULL); 502 static DEVICE_ATTR(chip_version, 0444, stmfts_sysfs_chip_version, NULL); 503 static DEVICE_ATTR(fw_ver, 0444, stmfts_sysfs_fw_ver, NULL); 504 static DEVICE_ATTR(config_id, 0444, stmfts_sysfs_config_id, NULL); 505 static DEVICE_ATTR(config_version, 0444, stmfts_sysfs_config_version, NULL); 506 static DEVICE_ATTR(status, 0444, stmfts_sysfs_read_status, NULL); 507 static DEVICE_ATTR(hover_enable, 0644, stmfts_sysfs_hover_enable_read, 508 stmfts_sysfs_hover_enable_write); 509 510 static struct attribute *stmfts_sysfs_attrs[] = { 511 &dev_attr_chip_id.attr, 512 &dev_attr_chip_version.attr, 513 &dev_attr_fw_ver.attr, 514 &dev_attr_config_id.attr, 515 &dev_attr_config_version.attr, 516 &dev_attr_status.attr, 517 &dev_attr_hover_enable.attr, 518 NULL 519 }; 520 ATTRIBUTE_GROUPS(stmfts_sysfs); 521 522 static int stmfts_power_on(struct stmfts_data *sdata) 523 { 524 int err; 525 u8 reg[8]; 526 527 err = regulator_bulk_enable(ARRAY_SIZE(sdata->regulators), 528 sdata->regulators); 529 if (err) 530 return err; 531 532 /* 533 * The datasheet does not specify the power on time, but considering 534 * that the reset time is < 10ms, I sleep 20ms to be sure 535 */ 536 msleep(20); 537 538 err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_INFO, 539 sizeof(reg), reg); 540 if (err < 0) 541 return err; 542 if (err != sizeof(reg)) 543 return -EIO; 544 545 sdata->chip_id = be16_to_cpup((__be16 *)®[6]); 546 sdata->chip_ver = reg[0]; 547 sdata->fw_ver = be16_to_cpup((__be16 *)®[2]); 548 sdata->config_id = reg[4]; 549 sdata->config_ver = reg[5]; 550 551 enable_irq(sdata->client->irq); 552 553 msleep(50); 554 555 err = stmfts_command(sdata, STMFTS_SYSTEM_RESET); 556 if (err) 557 return err; 558 559 err = stmfts_command(sdata, STMFTS_SLEEP_OUT); 560 if (err) 561 return err; 562 563 /* optional tuning */ 564 err = stmfts_command(sdata, STMFTS_MS_CX_TUNING); 565 if (err) 566 dev_warn(&sdata->client->dev, 567 "failed to perform mutual auto tune: %d\n", err); 568 569 /* optional tuning */ 570 err = stmfts_command(sdata, STMFTS_SS_CX_TUNING); 571 if (err) 572 dev_warn(&sdata->client->dev, 573 "failed to perform self auto tune: %d\n", err); 574 575 err = stmfts_command(sdata, STMFTS_FULL_FORCE_CALIBRATION); 576 if (err) 577 return err; 578 579 /* 580 * At this point no one is using the touchscreen 581 * and I don't really care about the return value 582 */ 583 (void) i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN); 584 585 return 0; 586 } 587 588 static void stmfts_power_off(void *data) 589 { 590 struct stmfts_data *sdata = data; 591 592 disable_irq(sdata->client->irq); 593 regulator_bulk_disable(ARRAY_SIZE(sdata->regulators), 594 sdata->regulators); 595 } 596 597 /* This function is void because I don't want to prevent using the touch key 598 * only because the LEDs don't get registered 599 */ 600 static int stmfts_enable_led(struct stmfts_data *sdata) 601 { 602 int err; 603 604 /* get the regulator for powering the leds on */ 605 sdata->ledvdd = devm_regulator_get(&sdata->client->dev, "ledvdd"); 606 if (IS_ERR(sdata->ledvdd)) 607 return PTR_ERR(sdata->ledvdd); 608 609 sdata->led_cdev.name = STMFTS_DEV_NAME; 610 sdata->led_cdev.max_brightness = LED_ON; 611 sdata->led_cdev.brightness = LED_OFF; 612 sdata->led_cdev.brightness_set_blocking = stmfts_brightness_set; 613 sdata->led_cdev.brightness_get = stmfts_brightness_get; 614 615 err = devm_led_classdev_register(&sdata->client->dev, &sdata->led_cdev); 616 if (err) { 617 devm_regulator_put(sdata->ledvdd); 618 return err; 619 } 620 621 return 0; 622 } 623 624 static int stmfts_probe(struct i2c_client *client) 625 { 626 int err; 627 struct stmfts_data *sdata; 628 629 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C | 630 I2C_FUNC_SMBUS_BYTE_DATA | 631 I2C_FUNC_SMBUS_I2C_BLOCK)) 632 return -ENODEV; 633 634 sdata = devm_kzalloc(&client->dev, sizeof(*sdata), GFP_KERNEL); 635 if (!sdata) 636 return -ENOMEM; 637 638 i2c_set_clientdata(client, sdata); 639 640 sdata->client = client; 641 mutex_init(&sdata->mutex); 642 init_completion(&sdata->cmd_done); 643 644 sdata->regulators[STMFTS_REGULATOR_VDD].supply = "vdd"; 645 sdata->regulators[STMFTS_REGULATOR_AVDD].supply = "avdd"; 646 err = devm_regulator_bulk_get(&client->dev, 647 ARRAY_SIZE(sdata->regulators), 648 sdata->regulators); 649 if (err) 650 return err; 651 652 sdata->input = devm_input_allocate_device(&client->dev); 653 if (!sdata->input) 654 return -ENOMEM; 655 656 sdata->input->name = STMFTS_DEV_NAME; 657 sdata->input->id.bustype = BUS_I2C; 658 sdata->input->open = stmfts_input_open; 659 sdata->input->close = stmfts_input_close; 660 661 input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_X); 662 input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_Y); 663 touchscreen_parse_properties(sdata->input, true, &sdata->prop); 664 665 input_set_abs_params(sdata->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); 666 input_set_abs_params(sdata->input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0); 667 input_set_abs_params(sdata->input, ABS_MT_ORIENTATION, 0, 255, 0, 0); 668 input_set_abs_params(sdata->input, ABS_MT_PRESSURE, 0, 255, 0, 0); 669 input_set_abs_params(sdata->input, ABS_DISTANCE, 0, 255, 0, 0); 670 671 sdata->use_key = device_property_read_bool(&client->dev, 672 "touch-key-connected"); 673 if (sdata->use_key) { 674 input_set_capability(sdata->input, EV_KEY, KEY_MENU); 675 input_set_capability(sdata->input, EV_KEY, KEY_BACK); 676 } 677 678 err = input_mt_init_slots(sdata->input, 679 STMFTS_MAX_FINGERS, INPUT_MT_DIRECT); 680 if (err) 681 return err; 682 683 input_set_drvdata(sdata->input, sdata); 684 685 /* 686 * stmfts_power_on expects interrupt to be disabled, but 687 * at this point the device is still off and I do not trust 688 * the status of the irq line that can generate some spurious 689 * interrupts. To be on the safe side it's better to not enable 690 * the interrupts during their request. 691 */ 692 err = devm_request_threaded_irq(&client->dev, client->irq, 693 NULL, stmfts_irq_handler, 694 IRQF_ONESHOT | IRQF_NO_AUTOEN, 695 "stmfts_irq", sdata); 696 if (err) 697 return err; 698 699 dev_dbg(&client->dev, "initializing ST-Microelectronics FTS...\n"); 700 701 err = stmfts_power_on(sdata); 702 if (err) 703 return err; 704 705 err = devm_add_action_or_reset(&client->dev, stmfts_power_off, sdata); 706 if (err) 707 return err; 708 709 err = input_register_device(sdata->input); 710 if (err) 711 return err; 712 713 if (sdata->use_key) { 714 err = stmfts_enable_led(sdata); 715 if (err) { 716 /* 717 * Even if the LEDs have failed to be initialized and 718 * used in the driver, I can still use the device even 719 * without LEDs. The ledvdd regulator pointer will be 720 * used as a flag. 721 */ 722 dev_warn(&client->dev, "unable to use touchkey leds\n"); 723 sdata->ledvdd = NULL; 724 } 725 } 726 727 pm_runtime_enable(&client->dev); 728 device_enable_async_suspend(&client->dev); 729 730 return 0; 731 } 732 733 static void stmfts_remove(struct i2c_client *client) 734 { 735 pm_runtime_disable(&client->dev); 736 } 737 738 static int stmfts_runtime_suspend(struct device *dev) 739 { 740 struct stmfts_data *sdata = dev_get_drvdata(dev); 741 int ret; 742 743 ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN); 744 if (ret) 745 dev_warn(dev, "failed to suspend device: %d\n", ret); 746 747 return ret; 748 } 749 750 static int stmfts_runtime_resume(struct device *dev) 751 { 752 struct stmfts_data *sdata = dev_get_drvdata(dev); 753 int ret; 754 755 ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_OUT); 756 if (ret) 757 dev_err(dev, "failed to resume device: %d\n", ret); 758 759 return ret; 760 } 761 762 static int stmfts_suspend(struct device *dev) 763 { 764 struct stmfts_data *sdata = dev_get_drvdata(dev); 765 766 stmfts_power_off(sdata); 767 768 return 0; 769 } 770 771 static int stmfts_resume(struct device *dev) 772 { 773 struct stmfts_data *sdata = dev_get_drvdata(dev); 774 775 return stmfts_power_on(sdata); 776 } 777 778 static const struct dev_pm_ops stmfts_pm_ops = { 779 SYSTEM_SLEEP_PM_OPS(stmfts_suspend, stmfts_resume) 780 RUNTIME_PM_OPS(stmfts_runtime_suspend, stmfts_runtime_resume, NULL) 781 }; 782 783 #ifdef CONFIG_OF 784 static const struct of_device_id stmfts_of_match[] = { 785 { .compatible = "st,stmfts", }, 786 { }, 787 }; 788 MODULE_DEVICE_TABLE(of, stmfts_of_match); 789 #endif 790 791 static const struct i2c_device_id stmfts_id[] = { 792 { "stmfts", 0 }, 793 { }, 794 }; 795 MODULE_DEVICE_TABLE(i2c, stmfts_id); 796 797 static struct i2c_driver stmfts_driver = { 798 .driver = { 799 .name = STMFTS_DEV_NAME, 800 .dev_groups = stmfts_sysfs_groups, 801 .of_match_table = of_match_ptr(stmfts_of_match), 802 .pm = pm_ptr(&stmfts_pm_ops), 803 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 804 }, 805 .probe = stmfts_probe, 806 .remove = stmfts_remove, 807 .id_table = stmfts_id, 808 }; 809 810 module_i2c_driver(stmfts_driver); 811 812 MODULE_AUTHOR("Andi Shyti <andi.shyti@samsung.com>"); 813 MODULE_DESCRIPTION("STMicroelectronics FTS Touch Screen"); 814 MODULE_LICENSE("GPL v2"); 815