drivers/input/touchscreen/mms114.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Melfas MMS114/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/of_device.h>
  11 #include <linux/i2c.h>
  12 #include <linux/input/mt.h>
  13 #include <linux/input/touchscreen.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/regulator/consumer.h>
  16 #include <linux/slab.h>
  17
  18 /* Write only registers */
  19 #define MMS114_MODE_CONTROL             0x01
  20 #define MMS114_OPERATION_MODE_MASK      0xE
  21 #define MMS114_ACTIVE                   BIT(1)
  22
  23 #define MMS114_XY_RESOLUTION_H          0x02
  24 #define MMS114_X_RESOLUTION             0x03
  25 #define MMS114_Y_RESOLUTION             0x04
  26 #define MMS114_CONTACT_THRESHOLD        0x05
  27 #define MMS114_MOVING_THRESHOLD         0x06
  28
  29 /* Read only registers */
  30 #define MMS114_PACKET_SIZE              0x0F
  31 #define MMS114_INFORMATION              0x10
  32 #define MMS114_TSP_REV                  0xF0
  33
  34 #define MMS152_FW_REV                   0xE1
  35 #define MMS152_COMPAT_GROUP             0xF2
  36
  37 /* Minimum delay time is 50us between stop and start signal of i2c */
  38 #define MMS114_I2C_DELAY                50
  39
  40 /* 200ms needs after power on */
  41 #define MMS114_POWERON_DELAY            200
  42
  43 /* Touchscreen absolute values */
  44 #define MMS114_MAX_AREA                 0xff
  45
  46 #define MMS114_MAX_TOUCH                10
  47 #define MMS114_PACKET_NUM               8
  48
  49 /* Touch type */
  50 #define MMS114_TYPE_NONE                0
  51 #define MMS114_TYPE_TOUCHSCREEN         1
  52 #define MMS114_TYPE_TOUCHKEY            2
  53
  54 enum mms_type {
  55         TYPE_MMS114     = 114,
  56         TYPE_MMS152     = 152,
  57         TYPE_MMS345L    = 345,
  58 };
  59
  60 struct mms114_data {
  61         struct i2c_client       *client;
  62         struct input_dev        *input_dev;
  63         struct regulator        *core_reg;
  64         struct regulator        *io_reg;
  65         struct touchscreen_properties props;
  66         enum mms_type           type;
  67         unsigned int            contact_threshold;
  68         unsigned int            moving_threshold;
  69
  70         /* Use cache data for mode control register(write only) */
  71         u8                      cache_mode_control;
  72 };
  73
  74 struct mms114_touch {
  75         u8 id:4, reserved_bit4:1, type:2, pressed:1;
  76         u8 x_hi:4, y_hi:4;
  77         u8 x_lo;
  78         u8 y_lo;
  79         u8 width;
  80         u8 strength;
  81         u8 reserved[2];
  82 } __packed;
  83
  84 static int __mms114_read_reg(struct mms114_data *data, unsigned int reg,
  85                              unsigned int len, u8 *val)
  86 {
  87         struct i2c_client *client = data->client;
  88         struct i2c_msg xfer[2];
  89         u8 buf = reg & 0xff;
  90         int error;
  91
  92         if (reg <= MMS114_MODE_CONTROL && reg + len > MMS114_MODE_CONTROL)
  93                 BUG();
  94
  95         /* Write register */
  96         xfer[0].addr = client->addr;
  97         xfer[0].flags = client->flags & I2C_M_TEN;
  98         xfer[0].len = 1;
  99         xfer[0].buf = &buf;
 100
 101         /* Read data */
 102         xfer[1].addr = client->addr;
 103         xfer[1].flags = (client->flags & I2C_M_TEN) | I2C_M_RD;
 104         xfer[1].len = len;
 105         xfer[1].buf = val;
 106
 107         error = i2c_transfer(client->adapter, xfer, 2);
 108         if (error != 2) {
 109                 dev_err(&client->dev,
 110                         "%s: i2c transfer failed (%d)\n", __func__, error);
 111                 return error < 0 ? error : -EIO;
 112         }
 113         udelay(MMS114_I2C_DELAY);
 114
 115         return 0;
 116 }
 117
 118 static int mms114_read_reg(struct mms114_data *data, unsigned int reg)
 119 {
 120         u8 val;
 121         int error;
 122
 123         if (reg == MMS114_MODE_CONTROL)
 124                 return data->cache_mode_control;
 125
 126         error = __mms114_read_reg(data, reg, 1, &val);
 127         return error < 0 ? error : val;
 128 }
 129
 130 static int mms114_write_reg(struct mms114_data *data, unsigned int reg,
 131                             unsigned int val)
 132 {
 133         struct i2c_client *client = data->client;
 134         u8 buf[2];
 135         int error;
 136
 137         buf[0] = reg & 0xff;
 138         buf[1] = val & 0xff;
 139
 140         error = i2c_master_send(client, buf, 2);
 141         if (error != 2) {
 142                 dev_err(&client->dev,
 143                         "%s: i2c send failed (%d)\n", __func__, error);
 144                 return error < 0 ? error : -EIO;
 145         }
 146         udelay(MMS114_I2C_DELAY);
 147
 148         if (reg == MMS114_MODE_CONTROL)
 149                 data->cache_mode_control = val;
 150
 151         return 0;
 152 }
 153
 154 static void mms114_process_mt(struct mms114_data *data, struct mms114_touch *touch)
 155 {
 156         struct i2c_client *client = data->client;
 157         struct input_dev *input_dev = data->input_dev;
 158         unsigned int id;
 159         unsigned int x;
 160         unsigned int y;
 161
 162         if (touch->id > MMS114_MAX_TOUCH) {
 163                 dev_err(&client->dev, "Wrong touch id (%d)\n", touch->id);
 164                 return;
 165         }
 166
 167         if (touch->type != MMS114_TYPE_TOUCHSCREEN) {
 168                 dev_err(&client->dev, "Wrong touch type (%d)\n", touch->type);
 169                 return;
 170         }
 171
 172         id = touch->id - 1;
 173         x = touch->x_lo | touch->x_hi << 8;
 174         y = touch->y_lo | touch->y_hi << 8;
 175
 176         dev_dbg(&client->dev,
 177                 "id: %d, type: %d, pressed: %d, x: %d, y: %d, width: %d, strength: %d\n",
 178                 id, touch->type, touch->pressed,
 179                 x, y, touch->width, touch->strength);
 180
 181         input_mt_slot(input_dev, id);
 182         input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, touch->pressed);
 183
 184         if (touch->pressed) {
 185                 touchscreen_report_pos(input_dev, &data->props, x, y, true);
 186                 input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, touch->width);
 187                 input_report_abs(input_dev, ABS_MT_PRESSURE, touch->strength);
 188         }
 189 }
 190
 191 static irqreturn_t mms114_interrupt(int irq, void *dev_id)
 192 {
 193         struct mms114_data *data = dev_id;
 194         struct input_dev *input_dev = data->input_dev;
 195         struct mms114_touch touch[MMS114_MAX_TOUCH];
 196         int packet_size;
 197         int touch_size;
 198         int index;
 199         int error;
 200
 201         mutex_lock(&input_dev->mutex);
 202         if (!input_device_enabled(input_dev)) {
 203                 mutex_unlock(&input_dev->mutex);
 204                 goto out;
 205         }
 206         mutex_unlock(&input_dev->mutex);
 207
 208         packet_size = mms114_read_reg(data, MMS114_PACKET_SIZE);
 209         if (packet_size <= 0)
 210                 goto out;
 211
 212         touch_size = packet_size / MMS114_PACKET_NUM;
 213
 214         error = __mms114_read_reg(data, MMS114_INFORMATION, packet_size,
 215                         (u8 *)touch);
 216         if (error < 0)
 217                 goto out;
 218
 219         for (index = 0; index < touch_size; index++)
 220                 mms114_process_mt(data, touch + index);
 221
 222         input_mt_report_pointer_emulation(data->input_dev, true);
 223         input_sync(data->input_dev);
 224
 225 out:
 226         return IRQ_HANDLED;
 227 }
 228
 229 static int mms114_set_active(struct mms114_data *data, bool active)
 230 {
 231         int val;
 232
 233         val = mms114_read_reg(data, MMS114_MODE_CONTROL);
 234         if (val < 0)
 235                 return val;
 236
 237         val &= ~MMS114_OPERATION_MODE_MASK;
 238
 239         /* If active is false, sleep mode */
 240         if (active)
 241                 val |= MMS114_ACTIVE;
 242
 243         return mms114_write_reg(data, MMS114_MODE_CONTROL, val);
 244 }
 245
 246 static int mms114_get_version(struct mms114_data *data)
 247 {
 248         struct device *dev = &data->client->dev;
 249         u8 buf[6];
 250         int group;
 251         int error;
 252
 253         switch (data->type) {
 254         case TYPE_MMS345L:
 255                 error = __mms114_read_reg(data, MMS152_FW_REV, 3, buf);
 256                 if (error)
 257                         return error;
 258
 259                 dev_info(dev, "TSP FW Rev: bootloader 0x%x / core 0x%x / config 0x%x\n",
 260                          buf[0], buf[1], buf[2]);
 261                 break;
 262
 263         case TYPE_MMS152:
 264                 error = __mms114_read_reg(data, MMS152_FW_REV, 3, buf);
 265                 if (error)
 266                         return error;
 267
 268                 group = i2c_smbus_read_byte_data(data->client,
 269                                                   MMS152_COMPAT_GROUP);
 270                 if (group < 0)
 271                         return group;
 272
 273                 dev_info(dev, "TSP FW Rev: bootloader 0x%x / core 0x%x / config 0x%x, Compat group: %c\n",
 274                          buf[0], buf[1], buf[2], group);
 275                 break;
 276
 277         case TYPE_MMS114:
 278                 error = __mms114_read_reg(data, MMS114_TSP_REV, 6, buf);
 279                 if (error)
 280                         return error;
 281
 282                 dev_info(dev, "TSP Rev: 0x%x, HW Rev: 0x%x, Firmware Ver: 0x%x\n",
 283                          buf[0], buf[1], buf[3]);
 284                 break;
 285         }
 286
 287         return 0;
 288 }
 289
 290 static int mms114_setup_regs(struct mms114_data *data)
 291 {
 292         const struct touchscreen_properties *props = &data->props;
 293         int val;
 294         int error;
 295
 296         error = mms114_get_version(data);
 297         if (error < 0)
 298                 return error;
 299
 300         /* Only MMS114 has configuration and power on registers */
 301         if (data->type != TYPE_MMS114)
 302                 return 0;
 303
 304         error = mms114_set_active(data, true);
 305         if (error < 0)
 306                 return error;
 307
 308         val = (props->max_x >> 8) & 0xf;
 309         val |= ((props->max_y >> 8) & 0xf) << 4;
 310         error = mms114_write_reg(data, MMS114_XY_RESOLUTION_H, val);
 311         if (error < 0)
 312                 return error;
 313
 314         val = props->max_x & 0xff;
 315         error = mms114_write_reg(data, MMS114_X_RESOLUTION, val);
 316         if (error < 0)
 317                 return error;
 318
 319         val = props->max_x & 0xff;
 320         error = mms114_write_reg(data, MMS114_Y_RESOLUTION, val);
 321         if (error < 0)
 322                 return error;
 323
 324         if (data->contact_threshold) {
 325                 error = mms114_write_reg(data, MMS114_CONTACT_THRESHOLD,
 326                                 data->contact_threshold);
 327                 if (error < 0)
 328                         return error;
 329         }
 330
 331         if (data->moving_threshold) {
 332                 error = mms114_write_reg(data, MMS114_MOVING_THRESHOLD,
 333                                 data->moving_threshold);
 334                 if (error < 0)
 335                         return error;
 336         }
 337
 338         return 0;
 339 }
 340
 341 static int mms114_start(struct mms114_data *data)
 342 {
 343         struct i2c_client *client = data->client;
 344         int error;
 345
 346         error = regulator_enable(data->core_reg);
 347         if (error) {
 348                 dev_err(&client->dev, "Failed to enable avdd: %d\n", error);
 349                 return error;
 350         }
 351
 352         error = regulator_enable(data->io_reg);
 353         if (error) {
 354                 dev_err(&client->dev, "Failed to enable vdd: %d\n", error);
 355                 regulator_disable(data->core_reg);
 356                 return error;
 357         }
 358
 359         msleep(MMS114_POWERON_DELAY);
 360
 361         error = mms114_setup_regs(data);
 362         if (error < 0) {
 363                 regulator_disable(data->io_reg);
 364                 regulator_disable(data->core_reg);
 365                 return error;
 366         }
 367
 368         enable_irq(client->irq);
 369
 370         return 0;
 371 }
 372
 373 static void mms114_stop(struct mms114_data *data)
 374 {
 375         struct i2c_client *client = data->client;
 376         int error;
 377
 378         disable_irq(client->irq);
 379
 380         error = regulator_disable(data->io_reg);
 381         if (error)
 382                 dev_warn(&client->dev, "Failed to disable vdd: %d\n", error);
 383
 384         error = regulator_disable(data->core_reg);
 385         if (error)
 386                 dev_warn(&client->dev, "Failed to disable avdd: %d\n", error);
 387 }
 388
 389 static int mms114_input_open(struct input_dev *dev)
 390 {
 391         struct mms114_data *data = input_get_drvdata(dev);
 392
 393         return mms114_start(data);
 394 }
 395
 396 static void mms114_input_close(struct input_dev *dev)
 397 {
 398         struct mms114_data *data = input_get_drvdata(dev);
 399
 400         mms114_stop(data);
 401 }
 402
 403 static int mms114_parse_legacy_bindings(struct mms114_data *data)
 404 {
 405         struct device *dev = &data->client->dev;
 406         struct touchscreen_properties *props = &data->props;
 407
 408         if (device_property_read_u32(dev, "x-size", &props->max_x)) {
 409                 dev_dbg(dev, "failed to get legacy x-size property\n");
 410                 return -EINVAL;
 411         }
 412
 413         if (device_property_read_u32(dev, "y-size", &props->max_y)) {
 414                 dev_dbg(dev, "failed to get legacy y-size property\n");
 415                 return -EINVAL;
 416         }
 417
 418         device_property_read_u32(dev, "contact-threshold",
 419                                 &data->contact_threshold);
 420         device_property_read_u32(dev, "moving-threshold",
 421                                 &data->moving_threshold);
 422
 423         if (device_property_read_bool(dev, "x-invert"))
 424                 props->invert_x = true;
 425         if (device_property_read_bool(dev, "y-invert"))
 426                 props->invert_y = true;
 427
 428         props->swap_x_y = false;
 429
 430         return 0;
 431 }
 432
 433 static int mms114_probe(struct i2c_client *client,
 434                                   const struct i2c_device_id *id)
 435 {
 436         struct mms114_data *data;
 437         struct input_dev *input_dev;
 438         const void *match_data;
 439         int error;
 440
 441         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 442                 dev_err(&client->dev, "Not supported I2C adapter\n");
 443                 return -ENODEV;
 444         }
 445
 446         data = devm_kzalloc(&client->dev, sizeof(struct mms114_data),
 447                             GFP_KERNEL);
 448         input_dev = devm_input_allocate_device(&client->dev);
 449         if (!data || !input_dev) {
 450                 dev_err(&client->dev, "Failed to allocate memory\n");
 451                 return -ENOMEM;
 452         }
 453
 454         data->client = client;
 455         data->input_dev = input_dev;
 456
 457         match_data = device_get_match_data(&client->dev);
 458         if (!match_data)
 459                 return -EINVAL;
 460
 461         data->type = (enum mms_type)match_data;
 462
 463         input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X);
 464         input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y);
 465         input_set_abs_params(input_dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
 466         input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
 467                              0, MMS114_MAX_AREA, 0, 0);
 468
 469         touchscreen_parse_properties(input_dev, true, &data->props);
 470         if (!data->props.max_x || !data->props.max_y) {
 471                 dev_dbg(&client->dev,
 472                         "missing X/Y size properties, trying legacy bindings\n");
 473                 error = mms114_parse_legacy_bindings(data);
 474                 if (error)
 475                         return error;
 476
 477                 input_set_abs_params(input_dev, ABS_MT_POSITION_X,
 478                                      0, data->props.max_x, 0, 0);
 479                 input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
 480                                      0, data->props.max_y, 0, 0);
 481         }
 482
 483         if (data->type == TYPE_MMS114) {
 484                 /*
 485                  * The firmware handles movement and pressure fuzz, so
 486                  * don't duplicate that in software.
 487                  */
 488                 data->moving_threshold = input_abs_get_fuzz(input_dev,
 489                                                             ABS_MT_POSITION_X);
 490                 data->contact_threshold = input_abs_get_fuzz(input_dev,
 491                                                              ABS_MT_PRESSURE);
 492                 input_abs_set_fuzz(input_dev, ABS_MT_POSITION_X, 0);
 493                 input_abs_set_fuzz(input_dev, ABS_MT_POSITION_Y, 0);
 494                 input_abs_set_fuzz(input_dev, ABS_MT_PRESSURE, 0);
 495         }
 496
 497         input_dev->name = devm_kasprintf(&client->dev, GFP_KERNEL,
 498                                          "MELFAS MMS%d Touchscreen",
 499                                          data->type);
 500         if (!input_dev->name)
 501                 return -ENOMEM;
 502
 503         input_dev->id.bustype = BUS_I2C;
 504         input_dev->dev.parent = &client->dev;
 505         input_dev->open = mms114_input_open;
 506         input_dev->close = mms114_input_close;
 507
 508         error = input_mt_init_slots(input_dev, MMS114_MAX_TOUCH,
 509                                     INPUT_MT_DIRECT);
 510         if (error)
 511                 return error;
 512
 513         input_set_drvdata(input_dev, data);
 514         i2c_set_clientdata(client, data);
 515
 516         data->core_reg = devm_regulator_get(&client->dev, "avdd");
 517         if (IS_ERR(data->core_reg)) {
 518                 error = PTR_ERR(data->core_reg);
 519                 dev_err(&client->dev,
 520                         "Unable to get the Core regulator (%d)\n", error);
 521                 return error;
 522         }
 523
 524         data->io_reg = devm_regulator_get(&client->dev, "vdd");
 525         if (IS_ERR(data->io_reg)) {
 526                 error = PTR_ERR(data->io_reg);
 527                 dev_err(&client->dev,
 528                         "Unable to get the IO regulator (%d)\n", error);
 529                 return error;
 530         }
 531
 532         error = devm_request_threaded_irq(&client->dev, client->irq,
 533                                           NULL, mms114_interrupt, IRQF_ONESHOT,
 534                                           dev_name(&client->dev), data);
 535         if (error) {
 536                 dev_err(&client->dev, "Failed to register interrupt\n");
 537                 return error;
 538         }
 539         disable_irq(client->irq);
 540
 541         error = input_register_device(data->input_dev);
 542         if (error) {
 543                 dev_err(&client->dev, "Failed to register input device\n");
 544                 return error;
 545         }
 546
 547         return 0;
 548 }
 549
 550 static int __maybe_unused mms114_suspend(struct device *dev)
 551 {
 552         struct i2c_client *client = to_i2c_client(dev);
 553         struct mms114_data *data = i2c_get_clientdata(client);
 554         struct input_dev *input_dev = data->input_dev;
 555         int id;
 556
 557         /* Release all touch */
 558         for (id = 0; id < MMS114_MAX_TOUCH; id++) {
 559                 input_mt_slot(input_dev, id);
 560                 input_mt_report_slot_inactive(input_dev);
 561         }
 562
 563         input_mt_report_pointer_emulation(input_dev, true);
 564         input_sync(input_dev);
 565
 566         mutex_lock(&input_dev->mutex);
 567         if (input_device_enabled(input_dev))
 568                 mms114_stop(data);
 569         mutex_unlock(&input_dev->mutex);
 570
 571         return 0;
 572 }
 573
 574 static int __maybe_unused mms114_resume(struct device *dev)
 575 {
 576         struct i2c_client *client = to_i2c_client(dev);
 577         struct mms114_data *data = i2c_get_clientdata(client);
 578         struct input_dev *input_dev = data->input_dev;
 579         int error;
 580
 581         mutex_lock(&input_dev->mutex);
 582         if (input_device_enabled(input_dev)) {
 583                 error = mms114_start(data);
 584                 if (error < 0) {
 585                         mutex_unlock(&input_dev->mutex);
 586                         return error;
 587                 }
 588         }
 589         mutex_unlock(&input_dev->mutex);
 590
 591         return 0;
 592 }
 593
 594 static SIMPLE_DEV_PM_OPS(mms114_pm_ops, mms114_suspend, mms114_resume);
 595
 596 static const struct i2c_device_id mms114_id[] = {
 597         { "mms114", 0 },
 598         { }
 599 };
 600 MODULE_DEVICE_TABLE(i2c, mms114_id);
 601
 602 #ifdef CONFIG_OF
 603 static const struct of_device_id mms114_dt_match[] = {
 604         {
 605                 .compatible = "melfas,mms114",
 606                 .data = (void *)TYPE_MMS114,
 607         }, {
 608                 .compatible = "melfas,mms152",
 609                 .data = (void *)TYPE_MMS152,
 610         }, {
 611                 .compatible = "melfas,mms345l",
 612                 .data = (void *)TYPE_MMS345L,
 613         },
 614         { }
 615 };
 616 MODULE_DEVICE_TABLE(of, mms114_dt_match);
 617 #endif
 618
 619 static struct i2c_driver mms114_driver = {
 620         .driver = {
 621                 .name   = "mms114",
 622                 .pm     = &mms114_pm_ops,
 623                 .of_match_table = of_match_ptr(mms114_dt_match),
 624         },
 625         .probe          = mms114_probe,
 626         .id_table       = mms114_id,
 627 };
 628
 629 module_i2c_driver(mms114_driver);
 630
 631 /* Module information */
 632 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 633 MODULE_DESCRIPTION("MELFAS mms114 Touchscreen driver");
 634 MODULE_LICENSE("GPL v2");