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 void 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 return; 118 119 if (!value) { 120 regulator_disable(sdata->ledvdd); 121 } else { 122 err = regulator_enable(sdata->ledvdd); 123 if (err) 124 dev_warn(&sdata->client->dev, 125 "failed to disable ledvdd regulator: %d\n", 126 err); 127 } 128 129 sdata->led_status = value; 130 } 131 132 static enum led_brightness stmfts_brightness_get(struct led_classdev *led_cdev) 133 { 134 struct stmfts_data *sdata = container_of(led_cdev, 135 struct stmfts_data, led_cdev); 136 137 return !!regulator_is_enabled(sdata->ledvdd); 138 } 139 140 /* 141 * We can't simply use i2c_smbus_read_i2c_block_data because we 142 * need to read more than 255 bytes ( 143 */ 144 static int stmfts_read_events(struct stmfts_data *sdata) 145 { 146 u8 cmd = STMFTS_READ_ALL_EVENT; 147 struct i2c_msg msgs[2] = { 148 { 149 .addr = sdata->client->addr, 150 .len = 1, 151 .buf = &cmd, 152 }, 153 { 154 .addr = sdata->client->addr, 155 .flags = I2C_M_RD, 156 .len = STMFTS_DATA_MAX_SIZE, 157 .buf = sdata->data, 158 }, 159 }; 160 int ret; 161 162 ret = i2c_transfer(sdata->client->adapter, msgs, ARRAY_SIZE(msgs)); 163 if (ret < 0) 164 return ret; 165 166 return ret == ARRAY_SIZE(msgs) ? 0 : -EIO; 167 } 168 169 static void stmfts_report_contact_event(struct stmfts_data *sdata, 170 const u8 event[]) 171 { 172 u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4; 173 u16 x = event[1] | ((event[2] & STMFTS_MASK_X_MSB) << 8); 174 u16 y = (event[2] >> 4) | (event[3] << 4); 175 u8 maj = event[4]; 176 u8 min = event[5]; 177 u8 orientation = event[6]; 178 u8 area = event[7]; 179 180 input_mt_slot(sdata->input, slot_id); 181 182 input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, true); 183 input_report_abs(sdata->input, ABS_MT_POSITION_X, x); 184 input_report_abs(sdata->input, ABS_MT_POSITION_Y, y); 185 input_report_abs(sdata->input, ABS_MT_TOUCH_MAJOR, maj); 186 input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, min); 187 input_report_abs(sdata->input, ABS_MT_PRESSURE, area); 188 input_report_abs(sdata->input, ABS_MT_ORIENTATION, orientation); 189 190 input_sync(sdata->input); 191 } 192 193 static void stmfts_report_contact_release(struct stmfts_data *sdata, 194 const u8 event[]) 195 { 196 u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4; 197 198 input_mt_slot(sdata->input, slot_id); 199 input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, false); 200 201 input_sync(sdata->input); 202 } 203 204 static void stmfts_report_hover_event(struct stmfts_data *sdata, 205 const u8 event[]) 206 { 207 u16 x = (event[2] << 4) | (event[4] >> 4); 208 u16 y = (event[3] << 4) | (event[4] & STMFTS_MASK_Y_LSB); 209 u8 z = event[5]; 210 211 input_report_abs(sdata->input, ABS_X, x); 212 input_report_abs(sdata->input, ABS_Y, y); 213 input_report_abs(sdata->input, ABS_DISTANCE, z); 214 215 input_sync(sdata->input); 216 } 217 218 static void stmfts_report_key_event(struct stmfts_data *sdata, const u8 event[]) 219 { 220 switch (event[2]) { 221 case 0: 222 input_report_key(sdata->input, KEY_BACK, 0); 223 input_report_key(sdata->input, KEY_MENU, 0); 224 break; 225 226 case STMFTS_MASK_KEY_BACK: 227 input_report_key(sdata->input, KEY_BACK, 1); 228 break; 229 230 case STMFTS_MASK_KEY_MENU: 231 input_report_key(sdata->input, KEY_MENU, 1); 232 break; 233 234 default: 235 dev_warn(&sdata->client->dev, 236 "unknown key event: %#02x\n", event[2]); 237 break; 238 } 239 240 input_sync(sdata->input); 241 } 242 243 static void stmfts_parse_events(struct stmfts_data *sdata) 244 { 245 int i; 246 247 for (i = 0; i < STMFTS_STACK_DEPTH; i++) { 248 u8 *event = &sdata->data[i * STMFTS_EVENT_SIZE]; 249 250 switch (event[0]) { 251 252 case STMFTS_EV_CONTROLLER_READY: 253 case STMFTS_EV_SLEEP_OUT_CONTROLLER_READY: 254 case STMFTS_EV_STATUS: 255 complete(&sdata->cmd_done); 256 /* fall through */ 257 258 case STMFTS_EV_NO_EVENT: 259 case STMFTS_EV_DEBUG: 260 return; 261 } 262 263 switch (event[0] & STMFTS_MASK_EVENT_ID) { 264 265 case STMFTS_EV_MULTI_TOUCH_ENTER: 266 case STMFTS_EV_MULTI_TOUCH_MOTION: 267 stmfts_report_contact_event(sdata, event); 268 break; 269 270 case STMFTS_EV_MULTI_TOUCH_LEAVE: 271 stmfts_report_contact_release(sdata, event); 272 break; 273 274 case STMFTS_EV_HOVER_ENTER: 275 case STMFTS_EV_HOVER_LEAVE: 276 case STMFTS_EV_HOVER_MOTION: 277 stmfts_report_hover_event(sdata, event); 278 break; 279 280 case STMFTS_EV_KEY_STATUS: 281 stmfts_report_key_event(sdata, event); 282 break; 283 284 case STMFTS_EV_ERROR: 285 dev_warn(&sdata->client->dev, 286 "error code: 0x%x%x%x%x%x%x", 287 event[6], event[5], event[4], 288 event[3], event[2], event[1]); 289 break; 290 291 default: 292 dev_err(&sdata->client->dev, 293 "unknown event %#02x\n", event[0]); 294 } 295 } 296 } 297 298 static irqreturn_t stmfts_irq_handler(int irq, void *dev) 299 { 300 struct stmfts_data *sdata = dev; 301 int err; 302 303 mutex_lock(&sdata->mutex); 304 305 err = stmfts_read_events(sdata); 306 if (unlikely(err)) 307 dev_err(&sdata->client->dev, 308 "failed to read events: %d\n", err); 309 else 310 stmfts_parse_events(sdata); 311 312 mutex_unlock(&sdata->mutex); 313 return IRQ_HANDLED; 314 } 315 316 static int stmfts_command(struct stmfts_data *sdata, const u8 cmd) 317 { 318 int err; 319 320 reinit_completion(&sdata->cmd_done); 321 322 err = i2c_smbus_write_byte(sdata->client, cmd); 323 if (err) 324 return err; 325 326 if (!wait_for_completion_timeout(&sdata->cmd_done, 327 msecs_to_jiffies(1000))) 328 return -ETIMEDOUT; 329 330 return 0; 331 } 332 333 static int stmfts_input_open(struct input_dev *dev) 334 { 335 struct stmfts_data *sdata = input_get_drvdata(dev); 336 int err; 337 338 err = pm_runtime_get_sync(&sdata->client->dev); 339 if (err < 0) 340 return err; 341 342 err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_ON); 343 if (err) 344 return err; 345 346 mutex_lock(&sdata->mutex); 347 sdata->running = true; 348 349 if (sdata->hover_enabled) { 350 err = i2c_smbus_write_byte(sdata->client, 351 STMFTS_SS_HOVER_SENSE_ON); 352 if (err) 353 dev_warn(&sdata->client->dev, 354 "failed to enable hover\n"); 355 } 356 mutex_unlock(&sdata->mutex); 357 358 if (sdata->use_key) { 359 err = i2c_smbus_write_byte(sdata->client, 360 STMFTS_MS_KEY_SENSE_ON); 361 if (err) 362 /* I can still use only the touch screen */ 363 dev_warn(&sdata->client->dev, 364 "failed to enable touchkey\n"); 365 } 366 367 return 0; 368 } 369 370 static void stmfts_input_close(struct input_dev *dev) 371 { 372 struct stmfts_data *sdata = input_get_drvdata(dev); 373 int err; 374 375 err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_OFF); 376 if (err) 377 dev_warn(&sdata->client->dev, 378 "failed to disable touchscreen: %d\n", err); 379 380 mutex_lock(&sdata->mutex); 381 382 sdata->running = false; 383 384 if (sdata->hover_enabled) { 385 err = i2c_smbus_write_byte(sdata->client, 386 STMFTS_SS_HOVER_SENSE_OFF); 387 if (err) 388 dev_warn(&sdata->client->dev, 389 "failed to disable hover: %d\n", err); 390 } 391 mutex_unlock(&sdata->mutex); 392 393 if (sdata->use_key) { 394 err = i2c_smbus_write_byte(sdata->client, 395 STMFTS_MS_KEY_SENSE_OFF); 396 if (err) 397 dev_warn(&sdata->client->dev, 398 "failed to disable touchkey: %d\n", err); 399 } 400 401 pm_runtime_put_sync(&sdata->client->dev); 402 } 403 404 static ssize_t stmfts_sysfs_chip_id(struct device *dev, 405 struct device_attribute *attr, char *buf) 406 { 407 struct stmfts_data *sdata = dev_get_drvdata(dev); 408 409 return sprintf(buf, "%#x\n", sdata->chip_id); 410 } 411 412 static ssize_t stmfts_sysfs_chip_version(struct device *dev, 413 struct device_attribute *attr, char *buf) 414 { 415 struct stmfts_data *sdata = dev_get_drvdata(dev); 416 417 return sprintf(buf, "%u\n", sdata->chip_ver); 418 } 419 420 static ssize_t stmfts_sysfs_fw_ver(struct device *dev, 421 struct device_attribute *attr, char *buf) 422 { 423 struct stmfts_data *sdata = dev_get_drvdata(dev); 424 425 return sprintf(buf, "%u\n", sdata->fw_ver); 426 } 427 428 static ssize_t stmfts_sysfs_config_id(struct device *dev, 429 struct device_attribute *attr, char *buf) 430 { 431 struct stmfts_data *sdata = dev_get_drvdata(dev); 432 433 return sprintf(buf, "%#x\n", sdata->config_id); 434 } 435 436 static ssize_t stmfts_sysfs_config_version(struct device *dev, 437 struct device_attribute *attr, char *buf) 438 { 439 struct stmfts_data *sdata = dev_get_drvdata(dev); 440 441 return sprintf(buf, "%u\n", sdata->config_ver); 442 } 443 444 static ssize_t stmfts_sysfs_read_status(struct device *dev, 445 struct device_attribute *attr, char *buf) 446 { 447 struct stmfts_data *sdata = dev_get_drvdata(dev); 448 u8 status[4]; 449 int err; 450 451 err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_STATUS, 452 sizeof(status), status); 453 if (err) 454 return err; 455 456 return sprintf(buf, "%#02x\n", status[0]); 457 } 458 459 static ssize_t stmfts_sysfs_hover_enable_read(struct device *dev, 460 struct device_attribute *attr, char *buf) 461 { 462 struct stmfts_data *sdata = dev_get_drvdata(dev); 463 464 return sprintf(buf, "%u\n", sdata->hover_enabled); 465 } 466 467 static ssize_t stmfts_sysfs_hover_enable_write(struct device *dev, 468 struct device_attribute *attr, 469 const char *buf, size_t len) 470 { 471 struct stmfts_data *sdata = dev_get_drvdata(dev); 472 unsigned long value; 473 int err = 0; 474 475 if (kstrtoul(buf, 0, &value)) 476 return -EINVAL; 477 478 mutex_lock(&sdata->mutex); 479 480 if (value & sdata->hover_enabled) 481 goto out; 482 483 if (sdata->running) 484 err = i2c_smbus_write_byte(sdata->client, 485 value ? STMFTS_SS_HOVER_SENSE_ON : 486 STMFTS_SS_HOVER_SENSE_OFF); 487 488 if (!err) 489 sdata->hover_enabled = !!value; 490 491 out: 492 mutex_unlock(&sdata->mutex); 493 494 return len; 495 } 496 497 static DEVICE_ATTR(chip_id, 0444, stmfts_sysfs_chip_id, NULL); 498 static DEVICE_ATTR(chip_version, 0444, stmfts_sysfs_chip_version, NULL); 499 static DEVICE_ATTR(fw_ver, 0444, stmfts_sysfs_fw_ver, NULL); 500 static DEVICE_ATTR(config_id, 0444, stmfts_sysfs_config_id, NULL); 501 static DEVICE_ATTR(config_version, 0444, stmfts_sysfs_config_version, NULL); 502 static DEVICE_ATTR(status, 0444, stmfts_sysfs_read_status, NULL); 503 static DEVICE_ATTR(hover_enable, 0644, stmfts_sysfs_hover_enable_read, 504 stmfts_sysfs_hover_enable_write); 505 506 static struct attribute *stmfts_sysfs_attrs[] = { 507 &dev_attr_chip_id.attr, 508 &dev_attr_chip_version.attr, 509 &dev_attr_fw_ver.attr, 510 &dev_attr_config_id.attr, 511 &dev_attr_config_version.attr, 512 &dev_attr_status.attr, 513 &dev_attr_hover_enable.attr, 514 NULL 515 }; 516 517 static struct attribute_group stmfts_attribute_group = { 518 .attrs = stmfts_sysfs_attrs 519 }; 520 521 static int stmfts_power_on(struct stmfts_data *sdata) 522 { 523 int err; 524 u8 reg[8]; 525 526 err = regulator_bulk_enable(ARRAY_SIZE(sdata->regulators), 527 sdata->regulators); 528 if (err) 529 return err; 530 531 /* 532 * The datasheet does not specify the power on time, but considering 533 * that the reset time is < 10ms, I sleep 20ms to be sure 534 */ 535 msleep(20); 536 537 err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_INFO, 538 sizeof(reg), reg); 539 if (err < 0) 540 return err; 541 if (err != sizeof(reg)) 542 return -EIO; 543 544 sdata->chip_id = be16_to_cpup((__be16 *)®[6]); 545 sdata->chip_ver = reg[0]; 546 sdata->fw_ver = be16_to_cpup((__be16 *)®[2]); 547 sdata->config_id = reg[4]; 548 sdata->config_ver = reg[5]; 549 550 enable_irq(sdata->client->irq); 551 552 msleep(50); 553 554 err = stmfts_command(sdata, STMFTS_SYSTEM_RESET); 555 if (err) 556 return err; 557 558 err = stmfts_command(sdata, STMFTS_SLEEP_OUT); 559 if (err) 560 return err; 561 562 /* optional tuning */ 563 err = stmfts_command(sdata, STMFTS_MS_CX_TUNING); 564 if (err) 565 dev_warn(&sdata->client->dev, 566 "failed to perform mutual auto tune: %d\n", err); 567 568 /* optional tuning */ 569 err = stmfts_command(sdata, STMFTS_SS_CX_TUNING); 570 if (err) 571 dev_warn(&sdata->client->dev, 572 "failed to perform self auto tune: %d\n", err); 573 574 err = stmfts_command(sdata, STMFTS_FULL_FORCE_CALIBRATION); 575 if (err) 576 return err; 577 578 /* 579 * At this point no one is using the touchscreen 580 * and I don't really care about the return value 581 */ 582 (void) i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN); 583 584 return 0; 585 } 586 587 static void stmfts_power_off(void *data) 588 { 589 struct stmfts_data *sdata = data; 590 591 disable_irq(sdata->client->irq); 592 regulator_bulk_disable(ARRAY_SIZE(sdata->regulators), 593 sdata->regulators); 594 } 595 596 /* This function is void because I don't want to prevent using the touch key 597 * only because the LEDs don't get registered 598 */ 599 static int stmfts_enable_led(struct stmfts_data *sdata) 600 { 601 int err; 602 603 /* get the regulator for powering the leds on */ 604 sdata->ledvdd = devm_regulator_get(&sdata->client->dev, "ledvdd"); 605 if (IS_ERR(sdata->ledvdd)) 606 return PTR_ERR(sdata->ledvdd); 607 608 sdata->led_cdev.name = STMFTS_DEV_NAME; 609 sdata->led_cdev.max_brightness = LED_ON; 610 sdata->led_cdev.brightness = LED_OFF; 611 sdata->led_cdev.brightness_set = stmfts_brightness_set; 612 sdata->led_cdev.brightness_get = stmfts_brightness_get; 613 614 err = devm_led_classdev_register(&sdata->client->dev, &sdata->led_cdev); 615 if (err) { 616 devm_regulator_put(sdata->ledvdd); 617 return err; 618 } 619 620 return 0; 621 } 622 623 static int stmfts_probe(struct i2c_client *client, 624 const struct i2c_device_id *id) 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 irq_set_status_flags(client->irq, IRQ_NOAUTOEN); 693 err = devm_request_threaded_irq(&client->dev, client->irq, 694 NULL, stmfts_irq_handler, 695 IRQF_ONESHOT, 696 "stmfts_irq", sdata); 697 if (err) 698 return err; 699 700 dev_dbg(&client->dev, "initializing ST-Microelectronics FTS...\n"); 701 702 err = stmfts_power_on(sdata); 703 if (err) 704 return err; 705 706 err = devm_add_action_or_reset(&client->dev, stmfts_power_off, sdata); 707 if (err) 708 return err; 709 710 err = input_register_device(sdata->input); 711 if (err) 712 return err; 713 714 if (sdata->use_key) { 715 err = stmfts_enable_led(sdata); 716 if (err) { 717 /* 718 * Even if the LEDs have failed to be initialized and 719 * used in the driver, I can still use the device even 720 * without LEDs. The ledvdd regulator pointer will be 721 * used as a flag. 722 */ 723 dev_warn(&client->dev, "unable to use touchkey leds\n"); 724 sdata->ledvdd = NULL; 725 } 726 } 727 728 err = devm_device_add_group(&client->dev, &stmfts_attribute_group); 729 if (err) 730 return err; 731 732 pm_runtime_enable(&client->dev); 733 device_enable_async_suspend(&client->dev); 734 735 return 0; 736 } 737 738 static int stmfts_remove(struct i2c_client *client) 739 { 740 pm_runtime_disable(&client->dev); 741 742 return 0; 743 } 744 745 static int __maybe_unused stmfts_runtime_suspend(struct device *dev) 746 { 747 struct stmfts_data *sdata = dev_get_drvdata(dev); 748 int ret; 749 750 ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN); 751 if (ret) 752 dev_warn(dev, "failed to suspend device: %d\n", ret); 753 754 return ret; 755 } 756 757 static int __maybe_unused stmfts_runtime_resume(struct device *dev) 758 { 759 struct stmfts_data *sdata = dev_get_drvdata(dev); 760 int ret; 761 762 ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_OUT); 763 if (ret) 764 dev_err(dev, "failed to resume device: %d\n", ret); 765 766 return ret; 767 } 768 769 static int __maybe_unused stmfts_suspend(struct device *dev) 770 { 771 struct stmfts_data *sdata = dev_get_drvdata(dev); 772 773 stmfts_power_off(sdata); 774 775 return 0; 776 } 777 778 static int __maybe_unused stmfts_resume(struct device *dev) 779 { 780 struct stmfts_data *sdata = dev_get_drvdata(dev); 781 782 return stmfts_power_on(sdata); 783 } 784 785 static const struct dev_pm_ops stmfts_pm_ops = { 786 SET_SYSTEM_SLEEP_PM_OPS(stmfts_suspend, stmfts_resume) 787 SET_RUNTIME_PM_OPS(stmfts_runtime_suspend, stmfts_runtime_resume, NULL) 788 }; 789 790 #ifdef CONFIG_OF 791 static const struct of_device_id stmfts_of_match[] = { 792 { .compatible = "st,stmfts", }, 793 { }, 794 }; 795 MODULE_DEVICE_TABLE(of, stmfts_of_match); 796 #endif 797 798 static const struct i2c_device_id stmfts_id[] = { 799 { "stmfts", 0 }, 800 { }, 801 }; 802 MODULE_DEVICE_TABLE(i2c, stmfts_id); 803 804 static struct i2c_driver stmfts_driver = { 805 .driver = { 806 .name = STMFTS_DEV_NAME, 807 .of_match_table = of_match_ptr(stmfts_of_match), 808 .pm = &stmfts_pm_ops, 809 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 810 }, 811 .probe = stmfts_probe, 812 .remove = stmfts_remove, 813 .id_table = stmfts_id, 814 }; 815 816 module_i2c_driver(stmfts_driver); 817 818 MODULE_AUTHOR("Andi Shyti <andi.shyti@samsung.com>"); 819 MODULE_DESCRIPTION("STMicroelectronics FTS Touch Screen"); 820 MODULE_LICENSE("GPL v2"); 821