1 // SPDX-License-Identifier: GPL-2.0 2 // Melfas MMS114/MMS136/MMS152 touchscreen device driver 3 // 4 // Copyright (c) 2012 Samsung Electronics Co., Ltd. 5 // Author: Joonyoung Shim <jy0922.shim@samsung.com> 6 7 #include <linux/module.h> 8 #include <linux/delay.h> 9 #include <linux/of.h> 10 #include <linux/i2c.h> 11 #include <linux/input/mt.h> 12 #include <linux/input/touchscreen.h> 13 #include <linux/interrupt.h> 14 #include <linux/regulator/consumer.h> 15 #include <linux/slab.h> 16 17 /* Write only registers */ 18 #define MMS114_MODE_CONTROL 0x01 19 #define MMS114_OPERATION_MODE_MASK 0xE 20 #define MMS114_ACTIVE BIT(1) 21 22 #define MMS114_XY_RESOLUTION_H 0x02 23 #define MMS114_X_RESOLUTION 0x03 24 #define MMS114_Y_RESOLUTION 0x04 25 #define MMS114_CONTACT_THRESHOLD 0x05 26 #define MMS114_MOVING_THRESHOLD 0x06 27 28 /* Read only registers */ 29 #define MMS114_PACKET_SIZE 0x0F 30 #define MMS114_INFORMATION 0x10 31 #define MMS114_TSP_REV 0xF0 32 33 #define MMS152_FW_REV 0xE1 34 #define MMS152_COMPAT_GROUP 0xF2 35 36 /* Minimum delay time is 50us between stop and start signal of i2c */ 37 #define MMS114_I2C_DELAY 50 38 39 /* 200ms needs after power on */ 40 #define MMS114_POWERON_DELAY 200 41 42 /* Touchscreen absolute values */ 43 #define MMS114_MAX_AREA 0xff 44 45 #define MMS114_MAX_TOUCHKEYS 15 46 #define MMS114_MAX_TOUCH 10 47 #define MMS114_EVENT_SIZE 8 48 #define MMS136_EVENT_SIZE 6 49 50 /* Touch type */ 51 #define MMS114_TYPE_NONE 0 52 #define MMS114_TYPE_TOUCHSCREEN 1 53 #define MMS114_TYPE_TOUCHKEY 2 54 55 enum mms_type { 56 TYPE_MMS114 = 114, 57 TYPE_MMS134S = 134, 58 TYPE_MMS136 = 136, 59 TYPE_MMS152 = 152, 60 TYPE_MMS345L = 345, 61 }; 62 63 struct mms114_data { 64 struct i2c_client *client; 65 struct input_dev *input_dev; 66 struct regulator *core_reg; 67 struct regulator *io_reg; 68 struct touchscreen_properties props; 69 enum mms_type type; 70 unsigned int contact_threshold; 71 unsigned int moving_threshold; 72 73 u32 keycodes[MMS114_MAX_TOUCHKEYS]; 74 int num_keycodes; 75 76 /* Use cache data for mode control register(write only) */ 77 u8 cache_mode_control; 78 }; 79 80 struct mms114_touch { 81 u8 id:4, reserved_bit4:1, type:2, pressed:1; 82 u8 x_hi:4, y_hi:4; 83 u8 x_lo; 84 u8 y_lo; 85 u8 width; 86 u8 strength; 87 u8 reserved[2]; 88 } __packed; 89 90 static int __mms114_read_reg(struct mms114_data *data, unsigned int reg, 91 unsigned int len, u8 *val) 92 { 93 struct i2c_client *client = data->client; 94 struct i2c_msg xfer[2]; 95 u8 buf = reg & 0xff; 96 int error; 97 98 if (reg <= MMS114_MODE_CONTROL && reg + len > MMS114_MODE_CONTROL) 99 BUG(); 100 101 /* Write register */ 102 xfer[0].addr = client->addr; 103 xfer[0].flags = client->flags & I2C_M_TEN; 104 xfer[0].len = 1; 105 xfer[0].buf = &buf; 106 107 /* Read data */ 108 xfer[1].addr = client->addr; 109 xfer[1].flags = (client->flags & I2C_M_TEN) | I2C_M_RD; 110 xfer[1].len = len; 111 xfer[1].buf = val; 112 113 error = i2c_transfer(client->adapter, xfer, 2); 114 if (error != 2) { 115 dev_err(&client->dev, 116 "%s: i2c transfer failed (%d)\n", __func__, error); 117 return error < 0 ? error : -EIO; 118 } 119 udelay(MMS114_I2C_DELAY); 120 121 return 0; 122 } 123 124 static int mms114_read_reg(struct mms114_data *data, unsigned int reg) 125 { 126 u8 val; 127 int error; 128 129 if (reg == MMS114_MODE_CONTROL) 130 return data->cache_mode_control; 131 132 error = __mms114_read_reg(data, reg, 1, &val); 133 return error < 0 ? error : val; 134 } 135 136 static int mms114_write_reg(struct mms114_data *data, unsigned int reg, 137 unsigned int val) 138 { 139 struct i2c_client *client = data->client; 140 u8 buf[2]; 141 int error; 142 143 buf[0] = reg & 0xff; 144 buf[1] = val & 0xff; 145 146 error = i2c_master_send(client, buf, 2); 147 if (error != 2) { 148 dev_err(&client->dev, 149 "%s: i2c send failed (%d)\n", __func__, error); 150 return error < 0 ? error : -EIO; 151 } 152 udelay(MMS114_I2C_DELAY); 153 154 if (reg == MMS114_MODE_CONTROL) 155 data->cache_mode_control = val; 156 157 return 0; 158 } 159 160 static void mms114_process_mt(struct mms114_data *data, struct mms114_touch *touch) 161 { 162 struct i2c_client *client = data->client; 163 struct input_dev *input_dev = data->input_dev; 164 unsigned int id; 165 unsigned int x; 166 unsigned int y; 167 168 if (touch->id > MMS114_MAX_TOUCH) { 169 dev_err(&client->dev, "Wrong touch id (%d)\n", touch->id); 170 return; 171 } 172 173 id = touch->id - 1; 174 x = touch->x_lo | touch->x_hi << 8; 175 y = touch->y_lo | touch->y_hi << 8; 176 177 dev_dbg(&client->dev, 178 "id: %d, type: %d, pressed: %d, x: %d, y: %d, width: %d, strength: %d\n", 179 id, touch->type, touch->pressed, 180 x, y, touch->width, touch->strength); 181 182 input_mt_slot(input_dev, id); 183 input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, touch->pressed); 184 185 if (touch->pressed) { 186 touchscreen_report_pos(input_dev, &data->props, x, y, true); 187 input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, touch->width); 188 input_report_abs(input_dev, ABS_MT_PRESSURE, touch->strength); 189 } 190 } 191 192 static void mms114_process_touchkey(struct mms114_data *data, 193 struct mms114_touch *touch) 194 { 195 struct i2c_client *client = data->client; 196 struct input_dev *input_dev = data->input_dev; 197 unsigned int keycode_id; 198 199 if (touch->id == 0) 200 return; 201 202 if (touch->id > data->num_keycodes) { 203 dev_err(&client->dev, "Wrong touch id for touchkey (%d)\n", 204 touch->id); 205 return; 206 } 207 208 keycode_id = touch->id - 1; 209 dev_dbg(&client->dev, "keycode id: %d, pressed: %d\n", keycode_id, 210 touch->pressed); 211 212 input_report_key(input_dev, data->keycodes[keycode_id], touch->pressed); 213 } 214 215 static irqreturn_t mms114_interrupt(int irq, void *dev_id) 216 { 217 struct mms114_data *data = dev_id; 218 struct i2c_client *client = data->client; 219 struct input_dev *input_dev = data->input_dev; 220 struct mms114_touch touch[MMS114_MAX_TOUCH]; 221 int packet_size; 222 int touch_size; 223 int index; 224 int error; 225 226 mutex_lock(&input_dev->mutex); 227 if (!input_device_enabled(input_dev)) { 228 mutex_unlock(&input_dev->mutex); 229 goto out; 230 } 231 mutex_unlock(&input_dev->mutex); 232 233 packet_size = mms114_read_reg(data, MMS114_PACKET_SIZE); 234 if (packet_size <= 0) 235 goto out; 236 237 /* MMS136 has slightly different event size */ 238 if (data->type == TYPE_MMS134S || data->type == TYPE_MMS136) 239 touch_size = packet_size / MMS136_EVENT_SIZE; 240 else 241 touch_size = packet_size / MMS114_EVENT_SIZE; 242 243 error = __mms114_read_reg(data, MMS114_INFORMATION, packet_size, 244 (u8 *)touch); 245 if (error < 0) 246 goto out; 247 248 for (index = 0; index < touch_size; index++) { 249 switch (touch[index].type) { 250 case MMS114_TYPE_TOUCHSCREEN: 251 mms114_process_mt(data, touch + index); 252 break; 253 254 case MMS114_TYPE_TOUCHKEY: 255 mms114_process_touchkey(data, touch + index); 256 break; 257 258 default: 259 dev_err(&client->dev, "Wrong touch type (%d)\n", 260 touch[index].type); 261 break; 262 } 263 } 264 265 input_mt_report_pointer_emulation(data->input_dev, true); 266 input_sync(data->input_dev); 267 268 out: 269 return IRQ_HANDLED; 270 } 271 272 static int mms114_set_active(struct mms114_data *data, bool active) 273 { 274 int val; 275 276 val = mms114_read_reg(data, MMS114_MODE_CONTROL); 277 if (val < 0) 278 return val; 279 280 val &= ~MMS114_OPERATION_MODE_MASK; 281 282 /* If active is false, sleep mode */ 283 if (active) 284 val |= MMS114_ACTIVE; 285 286 return mms114_write_reg(data, MMS114_MODE_CONTROL, val); 287 } 288 289 static int mms114_get_version(struct mms114_data *data) 290 { 291 struct device *dev = &data->client->dev; 292 u8 buf[6]; 293 int group; 294 int error; 295 296 switch (data->type) { 297 case TYPE_MMS345L: 298 error = __mms114_read_reg(data, MMS152_FW_REV, 3, buf); 299 if (error) 300 return error; 301 302 dev_info(dev, "TSP FW Rev: bootloader 0x%x / core 0x%x / config 0x%x\n", 303 buf[0], buf[1], buf[2]); 304 break; 305 306 case TYPE_MMS152: 307 error = __mms114_read_reg(data, MMS152_FW_REV, 3, buf); 308 if (error) 309 return error; 310 311 group = i2c_smbus_read_byte_data(data->client, 312 MMS152_COMPAT_GROUP); 313 if (group < 0) 314 return group; 315 316 dev_info(dev, "TSP FW Rev: bootloader 0x%x / core 0x%x / config 0x%x, Compat group: %c\n", 317 buf[0], buf[1], buf[2], group); 318 break; 319 320 case TYPE_MMS114: 321 case TYPE_MMS134S: 322 case TYPE_MMS136: 323 error = __mms114_read_reg(data, MMS114_TSP_REV, 6, buf); 324 if (error) 325 return error; 326 327 dev_info(dev, "TSP Rev: 0x%x, HW Rev: 0x%x, Firmware Ver: 0x%x\n", 328 buf[0], buf[1], buf[3]); 329 break; 330 } 331 332 return 0; 333 } 334 335 static int mms114_setup_regs(struct mms114_data *data) 336 { 337 const struct touchscreen_properties *props = &data->props; 338 int val; 339 int error; 340 341 error = mms114_get_version(data); 342 if (error < 0) 343 return error; 344 345 /* MMS114, MMS134S and MMS136 have configuration and power on registers */ 346 if (data->type != TYPE_MMS114 && data->type != TYPE_MMS134S && 347 data->type != TYPE_MMS136) 348 return 0; 349 350 error = mms114_set_active(data, true); 351 if (error < 0) 352 return error; 353 354 val = (props->max_x >> 8) & 0xf; 355 val |= ((props->max_y >> 8) & 0xf) << 4; 356 error = mms114_write_reg(data, MMS114_XY_RESOLUTION_H, val); 357 if (error < 0) 358 return error; 359 360 val = props->max_x & 0xff; 361 error = mms114_write_reg(data, MMS114_X_RESOLUTION, val); 362 if (error < 0) 363 return error; 364 365 val = props->max_x & 0xff; 366 error = mms114_write_reg(data, MMS114_Y_RESOLUTION, val); 367 if (error < 0) 368 return error; 369 370 if (data->contact_threshold) { 371 error = mms114_write_reg(data, MMS114_CONTACT_THRESHOLD, 372 data->contact_threshold); 373 if (error < 0) 374 return error; 375 } 376 377 if (data->moving_threshold) { 378 error = mms114_write_reg(data, MMS114_MOVING_THRESHOLD, 379 data->moving_threshold); 380 if (error < 0) 381 return error; 382 } 383 384 return 0; 385 } 386 387 static int mms114_start(struct mms114_data *data) 388 { 389 struct i2c_client *client = data->client; 390 int error; 391 392 error = regulator_enable(data->core_reg); 393 if (error) { 394 dev_err(&client->dev, "Failed to enable avdd: %d\n", error); 395 return error; 396 } 397 398 error = regulator_enable(data->io_reg); 399 if (error) { 400 dev_err(&client->dev, "Failed to enable vdd: %d\n", error); 401 regulator_disable(data->core_reg); 402 return error; 403 } 404 405 msleep(MMS114_POWERON_DELAY); 406 407 error = mms114_setup_regs(data); 408 if (error < 0) { 409 regulator_disable(data->io_reg); 410 regulator_disable(data->core_reg); 411 return error; 412 } 413 414 enable_irq(client->irq); 415 416 return 0; 417 } 418 419 static void mms114_stop(struct mms114_data *data) 420 { 421 struct i2c_client *client = data->client; 422 int error; 423 424 disable_irq(client->irq); 425 426 error = regulator_disable(data->io_reg); 427 if (error) 428 dev_warn(&client->dev, "Failed to disable vdd: %d\n", error); 429 430 error = regulator_disable(data->core_reg); 431 if (error) 432 dev_warn(&client->dev, "Failed to disable avdd: %d\n", error); 433 } 434 435 static int mms114_input_open(struct input_dev *dev) 436 { 437 struct mms114_data *data = input_get_drvdata(dev); 438 439 return mms114_start(data); 440 } 441 442 static void mms114_input_close(struct input_dev *dev) 443 { 444 struct mms114_data *data = input_get_drvdata(dev); 445 446 mms114_stop(data); 447 } 448 449 static int mms114_parse_legacy_bindings(struct mms114_data *data) 450 { 451 struct device *dev = &data->client->dev; 452 struct touchscreen_properties *props = &data->props; 453 454 if (device_property_read_u32(dev, "x-size", &props->max_x)) { 455 dev_dbg(dev, "failed to get legacy x-size property\n"); 456 return -EINVAL; 457 } 458 459 if (device_property_read_u32(dev, "y-size", &props->max_y)) { 460 dev_dbg(dev, "failed to get legacy y-size property\n"); 461 return -EINVAL; 462 } 463 464 device_property_read_u32(dev, "contact-threshold", 465 &data->contact_threshold); 466 device_property_read_u32(dev, "moving-threshold", 467 &data->moving_threshold); 468 469 if (device_property_read_bool(dev, "x-invert")) 470 props->invert_x = true; 471 if (device_property_read_bool(dev, "y-invert")) 472 props->invert_y = true; 473 474 props->swap_x_y = false; 475 476 return 0; 477 } 478 479 static int mms114_probe(struct i2c_client *client) 480 { 481 struct mms114_data *data; 482 struct input_dev *input_dev; 483 const void *match_data; 484 int error; 485 int i; 486 487 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { 488 dev_err(&client->dev, "Not supported I2C adapter\n"); 489 return -ENODEV; 490 } 491 492 data = devm_kzalloc(&client->dev, sizeof(struct mms114_data), 493 GFP_KERNEL); 494 input_dev = devm_input_allocate_device(&client->dev); 495 if (!data || !input_dev) { 496 dev_err(&client->dev, "Failed to allocate memory\n"); 497 return -ENOMEM; 498 } 499 500 data->client = client; 501 data->input_dev = input_dev; 502 503 match_data = device_get_match_data(&client->dev); 504 if (!match_data) 505 return -EINVAL; 506 507 data->type = (enum mms_type)match_data; 508 509 data->num_keycodes = device_property_count_u32(&client->dev, 510 "linux,keycodes"); 511 if (data->num_keycodes == -EINVAL) { 512 data->num_keycodes = 0; 513 } else if (data->num_keycodes < 0) { 514 dev_err(&client->dev, 515 "Unable to parse linux,keycodes property: %d\n", 516 data->num_keycodes); 517 return data->num_keycodes; 518 } else if (data->num_keycodes > MMS114_MAX_TOUCHKEYS) { 519 dev_warn(&client->dev, 520 "Found %d linux,keycodes but max is %d, ignoring the rest\n", 521 data->num_keycodes, MMS114_MAX_TOUCHKEYS); 522 data->num_keycodes = MMS114_MAX_TOUCHKEYS; 523 } 524 525 if (data->num_keycodes > 0) { 526 error = device_property_read_u32_array(&client->dev, 527 "linux,keycodes", 528 data->keycodes, 529 data->num_keycodes); 530 if (error) { 531 dev_err(&client->dev, 532 "Unable to read linux,keycodes values: %d\n", 533 error); 534 return error; 535 } 536 537 input_dev->keycode = data->keycodes; 538 input_dev->keycodemax = data->num_keycodes; 539 input_dev->keycodesize = sizeof(data->keycodes[0]); 540 for (i = 0; i < data->num_keycodes; i++) 541 input_set_capability(input_dev, 542 EV_KEY, data->keycodes[i]); 543 } 544 545 input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X); 546 input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y); 547 input_set_abs_params(input_dev, ABS_MT_PRESSURE, 0, 255, 0, 0); 548 input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 549 0, MMS114_MAX_AREA, 0, 0); 550 551 touchscreen_parse_properties(input_dev, true, &data->props); 552 if (!data->props.max_x || !data->props.max_y) { 553 dev_dbg(&client->dev, 554 "missing X/Y size properties, trying legacy bindings\n"); 555 error = mms114_parse_legacy_bindings(data); 556 if (error) 557 return error; 558 559 input_set_abs_params(input_dev, ABS_MT_POSITION_X, 560 0, data->props.max_x, 0, 0); 561 input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 562 0, data->props.max_y, 0, 0); 563 } 564 565 if (data->type == TYPE_MMS114 || data->type == TYPE_MMS134S || 566 data->type == TYPE_MMS136) { 567 /* 568 * The firmware handles movement and pressure fuzz, so 569 * don't duplicate that in software. 570 */ 571 data->moving_threshold = input_abs_get_fuzz(input_dev, 572 ABS_MT_POSITION_X); 573 data->contact_threshold = input_abs_get_fuzz(input_dev, 574 ABS_MT_PRESSURE); 575 input_abs_set_fuzz(input_dev, ABS_MT_POSITION_X, 0); 576 input_abs_set_fuzz(input_dev, ABS_MT_POSITION_Y, 0); 577 input_abs_set_fuzz(input_dev, ABS_MT_PRESSURE, 0); 578 } 579 580 input_dev->name = devm_kasprintf(&client->dev, GFP_KERNEL, 581 "MELFAS MMS%d Touchscreen", 582 data->type); 583 if (!input_dev->name) 584 return -ENOMEM; 585 586 input_dev->id.bustype = BUS_I2C; 587 input_dev->dev.parent = &client->dev; 588 input_dev->open = mms114_input_open; 589 input_dev->close = mms114_input_close; 590 591 error = input_mt_init_slots(input_dev, MMS114_MAX_TOUCH, 592 INPUT_MT_DIRECT); 593 if (error) 594 return error; 595 596 input_set_drvdata(input_dev, data); 597 i2c_set_clientdata(client, data); 598 599 data->core_reg = devm_regulator_get(&client->dev, "avdd"); 600 if (IS_ERR(data->core_reg)) { 601 error = PTR_ERR(data->core_reg); 602 dev_err(&client->dev, 603 "Unable to get the Core regulator (%d)\n", error); 604 return error; 605 } 606 607 data->io_reg = devm_regulator_get(&client->dev, "vdd"); 608 if (IS_ERR(data->io_reg)) { 609 error = PTR_ERR(data->io_reg); 610 dev_err(&client->dev, 611 "Unable to get the IO regulator (%d)\n", error); 612 return error; 613 } 614 615 error = devm_request_threaded_irq(&client->dev, client->irq, 616 NULL, mms114_interrupt, 617 IRQF_ONESHOT | IRQF_NO_AUTOEN, 618 dev_name(&client->dev), data); 619 if (error) { 620 dev_err(&client->dev, "Failed to register interrupt\n"); 621 return error; 622 } 623 624 error = input_register_device(data->input_dev); 625 if (error) { 626 dev_err(&client->dev, "Failed to register input device\n"); 627 return error; 628 } 629 630 return 0; 631 } 632 633 static int mms114_suspend(struct device *dev) 634 { 635 struct i2c_client *client = to_i2c_client(dev); 636 struct mms114_data *data = i2c_get_clientdata(client); 637 struct input_dev *input_dev = data->input_dev; 638 int id; 639 640 /* Release all touch */ 641 for (id = 0; id < MMS114_MAX_TOUCH; id++) { 642 input_mt_slot(input_dev, id); 643 input_mt_report_slot_inactive(input_dev); 644 } 645 646 input_mt_report_pointer_emulation(input_dev, true); 647 input_sync(input_dev); 648 649 mutex_lock(&input_dev->mutex); 650 if (input_device_enabled(input_dev)) 651 mms114_stop(data); 652 mutex_unlock(&input_dev->mutex); 653 654 return 0; 655 } 656 657 static int mms114_resume(struct device *dev) 658 { 659 struct i2c_client *client = to_i2c_client(dev); 660 struct mms114_data *data = i2c_get_clientdata(client); 661 struct input_dev *input_dev = data->input_dev; 662 int error; 663 664 mutex_lock(&input_dev->mutex); 665 if (input_device_enabled(input_dev)) { 666 error = mms114_start(data); 667 if (error < 0) { 668 mutex_unlock(&input_dev->mutex); 669 return error; 670 } 671 } 672 mutex_unlock(&input_dev->mutex); 673 674 return 0; 675 } 676 677 static DEFINE_SIMPLE_DEV_PM_OPS(mms114_pm_ops, mms114_suspend, mms114_resume); 678 679 static const struct i2c_device_id mms114_id[] = { 680 { "mms114" }, 681 { } 682 }; 683 MODULE_DEVICE_TABLE(i2c, mms114_id); 684 685 #ifdef CONFIG_OF 686 static const struct of_device_id mms114_dt_match[] = { 687 { 688 .compatible = "melfas,mms114", 689 .data = (void *)TYPE_MMS114, 690 }, { 691 .compatible = "melfas,mms134s", 692 .data = (void *)TYPE_MMS134S, 693 }, { 694 .compatible = "melfas,mms136", 695 .data = (void *)TYPE_MMS136, 696 }, { 697 .compatible = "melfas,mms152", 698 .data = (void *)TYPE_MMS152, 699 }, { 700 .compatible = "melfas,mms345l", 701 .data = (void *)TYPE_MMS345L, 702 }, 703 { } 704 }; 705 MODULE_DEVICE_TABLE(of, mms114_dt_match); 706 #endif 707 708 static struct i2c_driver mms114_driver = { 709 .driver = { 710 .name = "mms114", 711 .pm = pm_sleep_ptr(&mms114_pm_ops), 712 .of_match_table = of_match_ptr(mms114_dt_match), 713 }, 714 .probe = mms114_probe, 715 .id_table = mms114_id, 716 }; 717 718 module_i2c_driver(mms114_driver); 719 720 /* Module information */ 721 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>"); 722 MODULE_DESCRIPTION("MELFAS mms114 Touchscreen driver"); 723 MODULE_LICENSE("GPL v2"); 724