drivers/input/touchscreen/zinitix.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include <linux/delay.h>
   4 #include <linux/i2c.h>
   5 #include <linux/input.h>
   6 #include <linux/input/mt.h>
   7 #include <linux/input/touchscreen.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/irq.h>
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/property.h>
  14 #include <linux/regulator/consumer.h>
  15 #include <linux/slab.h>
  16
  17 /* Register Map */
  18
  19 #define ZINITIX_SWRESET_CMD                     0x0000
  20 #define ZINITIX_WAKEUP_CMD                      0x0001
  21
  22 #define ZINITIX_IDLE_CMD                        0x0004
  23 #define ZINITIX_SLEEP_CMD                       0x0005
  24
  25 #define ZINITIX_CLEAR_INT_STATUS_CMD            0x0003
  26 #define ZINITIX_CALIBRATE_CMD                   0x0006
  27 #define ZINITIX_SAVE_STATUS_CMD                 0x0007
  28 #define ZINITIX_SAVE_CALIBRATION_CMD            0x0008
  29 #define ZINITIX_RECALL_FACTORY_CMD              0x000f
  30
  31 #define ZINITIX_THRESHOLD                       0x0020
  32
  33 #define ZINITIX_LARGE_PALM_REJECT_AREA_TH       0x003F
  34
  35 #define ZINITIX_DEBUG_REG                       0x0115 /* 0~7 */
  36
  37 #define ZINITIX_TOUCH_MODE                      0x0010
  38
  39 #define ZINITIX_CHIP_REVISION                   0x0011
  40 #define ZINITIX_CHIP_BTX0X_MASK                 0xF0F0
  41 #define ZINITIX_CHIP_BT4X2                      0x4020
  42 #define ZINITIX_CHIP_BT4X3                      0x4030
  43 #define ZINITIX_CHIP_BT4X4                      0x4040
  44
  45 #define ZINITIX_FIRMWARE_VERSION                0x0012
  46
  47 #define ZINITIX_USB_DETECT                      0x116
  48
  49 #define ZINITIX_MINOR_FW_VERSION                0x0121
  50
  51 #define ZINITIX_VENDOR_ID                       0x001C
  52 #define ZINITIX_HW_ID                           0x0014
  53
  54 #define ZINITIX_DATA_VERSION_REG                0x0013
  55 #define ZINITIX_SUPPORTED_FINGER_NUM            0x0015
  56 #define ZINITIX_EEPROM_INFO                     0x0018
  57 #define ZINITIX_INITIAL_TOUCH_MODE              0x0019
  58
  59 #define ZINITIX_TOTAL_NUMBER_OF_X               0x0060
  60 #define ZINITIX_TOTAL_NUMBER_OF_Y               0x0061
  61
  62 #define ZINITIX_DELAY_RAW_FOR_HOST              0x007f
  63
  64 #define ZINITIX_BUTTON_SUPPORTED_NUM            0x00B0
  65 #define ZINITIX_BUTTON_SENSITIVITY              0x00B2
  66 #define ZINITIX_DUMMY_BUTTON_SENSITIVITY        0X00C8
  67
  68 #define ZINITIX_X_RESOLUTION                    0x00C0
  69 #define ZINITIX_Y_RESOLUTION                    0x00C1
  70
  71 #define ZINITIX_POINT_STATUS_REG                0x0080
  72
  73 #define ZINITIX_BT4X2_ICON_STATUS_REG           0x009A
  74 #define ZINITIX_BT4X3_ICON_STATUS_REG           0x00A0
  75 #define ZINITIX_BT4X4_ICON_STATUS_REG           0x00A0
  76 #define ZINITIX_BT5XX_ICON_STATUS_REG           0x00AA
  77
  78 #define ZINITIX_POINT_COORD_REG                 (ZINITIX_POINT_STATUS_REG + 2)
  79
  80 #define ZINITIX_AFE_FREQUENCY                   0x0100
  81 #define ZINITIX_DND_N_COUNT                     0x0122
  82 #define ZINITIX_DND_U_COUNT                     0x0135
  83
  84 #define ZINITIX_RAWDATA_REG                     0x0200
  85
  86 #define ZINITIX_EEPROM_INFO_REG                 0x0018
  87
  88 #define ZINITIX_INT_ENABLE_FLAG                 0x00f0
  89 #define ZINITIX_PERIODICAL_INTERRUPT_INTERVAL   0x00f1
  90
  91 #define ZINITIX_BTN_WIDTH                       0x016d
  92
  93 #define ZINITIX_CHECKSUM_RESULT                 0x012c
  94
  95 #define ZINITIX_INIT_FLASH                      0x01d0
  96 #define ZINITIX_WRITE_FLASH                     0x01d1
  97 #define ZINITIX_READ_FLASH                      0x01d2
  98
  99 #define ZINITIX_INTERNAL_FLAG_02                0x011e
 100 #define ZINITIX_INTERNAL_FLAG_03                0x011f
 101
 102 #define ZINITIX_I2C_CHECKSUM_WCNT               0x016a
 103 #define ZINITIX_I2C_CHECKSUM_RESULT             0x016c
 104
 105 /* Interrupt & status register flags */
 106
 107 #define BIT_PT_CNT_CHANGE                       BIT(0)
 108 #define BIT_DOWN                                BIT(1)
 109 #define BIT_MOVE                                BIT(2)
 110 #define BIT_UP                                  BIT(3)
 111 #define BIT_PALM                                BIT(4)
 112 #define BIT_PALM_REJECT                         BIT(5)
 113 #define BIT_RESERVED_0                          BIT(6)
 114 #define BIT_RESERVED_1                          BIT(7)
 115 #define BIT_WEIGHT_CHANGE                       BIT(8)
 116 #define BIT_PT_NO_CHANGE                        BIT(9)
 117 #define BIT_REJECT                              BIT(10)
 118 #define BIT_PT_EXIST                            BIT(11)
 119 #define BIT_RESERVED_2                          BIT(12)
 120 #define BIT_ERROR                               BIT(13)
 121 #define BIT_DEBUG                               BIT(14)
 122 #define BIT_ICON_EVENT                          BIT(15)
 123
 124 #define SUB_BIT_EXIST                           BIT(0)
 125 #define SUB_BIT_DOWN                            BIT(1)
 126 #define SUB_BIT_MOVE                            BIT(2)
 127 #define SUB_BIT_UP                              BIT(3)
 128 #define SUB_BIT_UPDATE                          BIT(4)
 129 #define SUB_BIT_WAIT                            BIT(5)
 130
 131 #define DEFAULT_TOUCH_POINT_MODE                2
 132 #define MAX_SUPPORTED_FINGER_NUM                5
 133 #define MAX_SUPPORTED_BUTTON_NUM                8
 134
 135 #define CHIP_ON_DELAY                           15 // ms
 136 #define FIRMWARE_ON_DELAY                       40 // ms
 137
 138 struct point_coord {
 139         __le16  x;
 140         __le16  y;
 141         u8      width;
 142         u8      sub_status;
 143         // currently unused, but needed as padding:
 144         u8      minor_width;
 145         u8      angle;
 146 };
 147
 148 struct touch_event {
 149         __le16  status;
 150         u8      finger_mask;
 151         u8      time_stamp;
 152         struct point_coord point_coord[MAX_SUPPORTED_FINGER_NUM];
 153 };
 154
 155 struct bt541_ts_data {
 156         struct i2c_client *client;
 157         struct input_dev *input_dev;
 158         struct touchscreen_properties prop;
 159         struct regulator_bulk_data supplies[2];
 160         u32 zinitix_mode;
 161         u32 keycodes[MAX_SUPPORTED_BUTTON_NUM];
 162         int num_keycodes;
 163         bool have_versioninfo;
 164         u16 chip_revision;
 165         u16 firmware_version;
 166         u16 regdata_version;
 167         u16 icon_status_reg;
 168 };
 169
 170 static int zinitix_read_data(struct i2c_client *client,
 171                              u16 reg, void *values, size_t length)
 172 {
 173         __le16 reg_le = cpu_to_le16(reg);
 174         int ret;
 175
 176         /* A single i2c_transfer() transaction does not work here. */
 177         ret = i2c_master_send(client, (u8 *)&reg_le, sizeof(reg_le));
 178         if (ret != sizeof(reg_le))
 179                 return ret < 0 ? ret : -EIO;
 180
 181         ret = i2c_master_recv(client, (u8 *)values, length);
 182         if (ret != length)
 183                 return ret < 0 ? ret : -EIO;
 184
 185         return 0;
 186 }
 187
 188 static int zinitix_write_u16(struct i2c_client *client, u16 reg, u16 value)
 189 {
 190         __le16 packet[2] = {cpu_to_le16(reg), cpu_to_le16(value)};
 191         int ret;
 192
 193         ret = i2c_master_send(client, (u8 *)packet, sizeof(packet));
 194         if (ret != sizeof(packet))
 195                 return ret < 0 ? ret : -EIO;
 196
 197         return 0;
 198 }
 199
 200 static int zinitix_write_cmd(struct i2c_client *client, u16 reg)
 201 {
 202         __le16 reg_le = cpu_to_le16(reg);
 203         int ret;
 204
 205         ret = i2c_master_send(client, (u8 *)&reg_le, sizeof(reg_le));
 206         if (ret != sizeof(reg_le))
 207                 return ret < 0 ? ret : -EIO;
 208
 209         return 0;
 210 }
 211
 212 static u16 zinitix_get_u16_reg(struct bt541_ts_data *bt541, u16 vreg)
 213 {
 214         struct i2c_client *client = bt541->client;
 215         int error;
 216         __le16 val;
 217
 218         error = zinitix_read_data(client, vreg, (void *)&val, 2);
 219         if (error)
 220                 return U8_MAX;
 221
 222         return le16_to_cpu(val);
 223 }
 224
 225 static int zinitix_init_touch(struct bt541_ts_data *bt541)
 226 {
 227         struct i2c_client *client = bt541->client;
 228         int i;
 229         int error;
 230         u16 int_flags;
 231
 232         error = zinitix_write_cmd(client, ZINITIX_SWRESET_CMD);
 233         if (error) {
 234                 dev_err(&client->dev, "Failed to write reset command\n");
 235                 return error;
 236         }
 237
 238         /*
 239          * Read and cache the chip revision and firmware version the first time
 240          * we get here.
 241          */
 242         if (!bt541->have_versioninfo) {
 243                 bt541->chip_revision = zinitix_get_u16_reg(bt541,
 244                                                 ZINITIX_CHIP_REVISION);
 245                 bt541->firmware_version = zinitix_get_u16_reg(bt541,
 246                                                 ZINITIX_FIRMWARE_VERSION);
 247                 bt541->regdata_version = zinitix_get_u16_reg(bt541,
 248                                                 ZINITIX_DATA_VERSION_REG);
 249                 bt541->have_versioninfo = true;
 250
 251                 dev_dbg(&client->dev,
 252                         "chip revision %04x firmware version %04x regdata version %04x\n",
 253                         bt541->chip_revision, bt541->firmware_version,
 254                         bt541->regdata_version);
 255
 256                 /*
 257                  * Determine the "icon" status register which varies by the
 258                  * chip.
 259                  */
 260                 switch (bt541->chip_revision & ZINITIX_CHIP_BTX0X_MASK) {
 261                 case ZINITIX_CHIP_BT4X2:
 262                         bt541->icon_status_reg = ZINITIX_BT4X2_ICON_STATUS_REG;
 263                         break;
 264
 265                 case ZINITIX_CHIP_BT4X3:
 266                         bt541->icon_status_reg = ZINITIX_BT4X3_ICON_STATUS_REG;
 267                         break;
 268
 269                 case ZINITIX_CHIP_BT4X4:
 270                         bt541->icon_status_reg = ZINITIX_BT4X4_ICON_STATUS_REG;
 271                         break;
 272
 273                 default:
 274                         bt541->icon_status_reg = ZINITIX_BT5XX_ICON_STATUS_REG;
 275                         break;
 276                 }
 277         }
 278
 279         error = zinitix_write_u16(client, ZINITIX_INT_ENABLE_FLAG, 0x0);
 280         if (error) {
 281                 dev_err(&client->dev,
 282                         "Failed to reset interrupt enable flag\n");
 283                 return error;
 284         }
 285
 286         /* initialize */
 287         error = zinitix_write_u16(client, ZINITIX_X_RESOLUTION,
 288                                   bt541->prop.max_x);
 289         if (error)
 290                 return error;
 291
 292         error = zinitix_write_u16(client, ZINITIX_Y_RESOLUTION,
 293                                   bt541->prop.max_y);
 294         if (error)
 295                 return error;
 296
 297         error = zinitix_write_u16(client, ZINITIX_SUPPORTED_FINGER_NUM,
 298                                   MAX_SUPPORTED_FINGER_NUM);
 299         if (error)
 300                 return error;
 301
 302         error = zinitix_write_u16(client, ZINITIX_BUTTON_SUPPORTED_NUM,
 303                                   bt541->num_keycodes);
 304         if (error)
 305                 return error;
 306
 307         error = zinitix_write_u16(client, ZINITIX_INITIAL_TOUCH_MODE,
 308                                   bt541->zinitix_mode);
 309         if (error)
 310                 return error;
 311
 312         error = zinitix_write_u16(client, ZINITIX_TOUCH_MODE,
 313                                   bt541->zinitix_mode);
 314         if (error)
 315                 return error;
 316
 317         int_flags = BIT_PT_CNT_CHANGE | BIT_DOWN | BIT_MOVE | BIT_UP;
 318         if (bt541->num_keycodes)
 319                 int_flags |= BIT_ICON_EVENT;
 320
 321         error = zinitix_write_u16(client, ZINITIX_INT_ENABLE_FLAG, int_flags);
 322         if (error)
 323                 return error;
 324
 325         /* clear queue */
 326         for (i = 0; i < 10; i++) {
 327                 zinitix_write_cmd(client, ZINITIX_CLEAR_INT_STATUS_CMD);
 328                 udelay(10);
 329         }
 330
 331         return 0;
 332 }
 333
 334 static int zinitix_init_regulators(struct bt541_ts_data *bt541)
 335 {
 336         struct device *dev = &bt541->client->dev;
 337         int error;
 338
 339         /*
 340          * Some older device trees have erroneous names for the regulators,
 341          * so check if "vddo" is present and in that case use these names.
 342          * Else use the proper supply names on the component.
 343          */
 344         if (of_property_present(dev->of_node, "vddo-supply")) {
 345                 bt541->supplies[0].supply = "vdd";
 346                 bt541->supplies[1].supply = "vddo";
 347         } else {
 348                 /* Else use the proper supply names */
 349                 bt541->supplies[0].supply = "vcca";
 350                 bt541->supplies[1].supply = "vdd";
 351         }
 352         error = devm_regulator_bulk_get(dev,
 353                                         ARRAY_SIZE(bt541->supplies),
 354                                         bt541->supplies);
 355         if (error < 0) {
 356                 dev_err(dev, "Failed to get regulators: %d\n", error);
 357                 return error;
 358         }
 359
 360         return 0;
 361 }
 362
 363 static int zinitix_send_power_on_sequence(struct bt541_ts_data *bt541)
 364 {
 365         int error;
 366         struct i2c_client *client = bt541->client;
 367
 368         error = zinitix_write_u16(client, 0xc000, 0x0001);
 369         if (error) {
 370                 dev_err(&client->dev,
 371                         "Failed to send power sequence(vendor cmd enable)\n");
 372                 return error;
 373         }
 374         udelay(10);
 375
 376         error = zinitix_write_cmd(client, 0xc004);
 377         if (error) {
 378                 dev_err(&client->dev,
 379                         "Failed to send power sequence (intn clear)\n");
 380                 return error;
 381         }
 382         udelay(10);
 383
 384         error = zinitix_write_u16(client, 0xc002, 0x0001);
 385         if (error) {
 386                 dev_err(&client->dev,
 387                         "Failed to send power sequence (nvm init)\n");
 388                 return error;
 389         }
 390         mdelay(2);
 391
 392         error = zinitix_write_u16(client, 0xc001, 0x0001);
 393         if (error) {
 394                 dev_err(&client->dev,
 395                         "Failed to send power sequence (program start)\n");
 396                 return error;
 397         }
 398         msleep(FIRMWARE_ON_DELAY);
 399
 400         return 0;
 401 }
 402
 403 static void zinitix_report_finger(struct bt541_ts_data *bt541, int slot,
 404                                   const struct point_coord *p)
 405 {
 406         u16 x, y;
 407
 408         if (unlikely(!(p->sub_status &
 409                        (SUB_BIT_UP | SUB_BIT_DOWN | SUB_BIT_MOVE)))) {
 410                 dev_dbg(&bt541->client->dev, "unknown finger event %#02x\n",
 411                         p->sub_status);
 412                 return;
 413         }
 414
 415         x = le16_to_cpu(p->x);
 416         y = le16_to_cpu(p->y);
 417
 418         input_mt_slot(bt541->input_dev, slot);
 419         if (input_mt_report_slot_state(bt541->input_dev, MT_TOOL_FINGER,
 420                                        !(p->sub_status & SUB_BIT_UP))) {
 421                 touchscreen_report_pos(bt541->input_dev,
 422                                        &bt541->prop, x, y, true);
 423                 input_report_abs(bt541->input_dev,
 424                                  ABS_MT_TOUCH_MAJOR, p->width);
 425                 dev_dbg(&bt541->client->dev, "finger %d %s (%u, %u)\n",
 426                         slot, p->sub_status & SUB_BIT_DOWN ? "down" : "move",
 427                         x, y);
 428         } else {
 429                 dev_dbg(&bt541->client->dev, "finger %d up (%u, %u)\n",
 430                         slot, x, y);
 431         }
 432 }
 433
 434 static void zinitix_report_keys(struct bt541_ts_data *bt541, u16 icon_events)
 435 {
 436         int i;
 437
 438         for (i = 0; i < bt541->num_keycodes; i++)
 439                 input_report_key(bt541->input_dev,
 440                                  bt541->keycodes[i], icon_events & BIT(i));
 441 }
 442
 443 static irqreturn_t zinitix_ts_irq_handler(int irq, void *bt541_handler)
 444 {
 445         struct bt541_ts_data *bt541 = bt541_handler;
 446         struct i2c_client *client = bt541->client;
 447         struct touch_event touch_event;
 448         unsigned long finger_mask;
 449         __le16 icon_events;
 450         int error;
 451         int i;
 452
 453         memset(&touch_event, 0, sizeof(struct touch_event));
 454
 455         error = zinitix_read_data(bt541->client, ZINITIX_POINT_STATUS_REG,
 456                                   &touch_event, sizeof(struct touch_event));
 457         if (error) {
 458                 dev_err(&client->dev, "Failed to read in touchpoint struct\n");
 459                 goto out;
 460         }
 461
 462         if (le16_to_cpu(touch_event.status) & BIT_ICON_EVENT) {
 463                 error = zinitix_read_data(bt541->client, bt541->icon_status_reg,
 464                                           &icon_events, sizeof(icon_events));
 465                 if (error) {
 466                         dev_err(&client->dev, "Failed to read icon events\n");
 467                         goto out;
 468                 }
 469
 470                 zinitix_report_keys(bt541, le16_to_cpu(icon_events));
 471         }
 472
 473         finger_mask = touch_event.finger_mask;
 474         for_each_set_bit(i, &finger_mask, MAX_SUPPORTED_FINGER_NUM) {
 475                 const struct point_coord *p = &touch_event.point_coord[i];
 476
 477                 /* Only process contacts that are actually reported */
 478                 if (p->sub_status & SUB_BIT_EXIST)
 479                         zinitix_report_finger(bt541, i, p);
 480         }
 481
 482         input_mt_sync_frame(bt541->input_dev);
 483         input_sync(bt541->input_dev);
 484
 485 out:
 486         zinitix_write_cmd(bt541->client, ZINITIX_CLEAR_INT_STATUS_CMD);
 487         return IRQ_HANDLED;
 488 }
 489
 490 static int zinitix_start(struct bt541_ts_data *bt541)
 491 {
 492         int error;
 493
 494         error = regulator_bulk_enable(ARRAY_SIZE(bt541->supplies),
 495                                       bt541->supplies);
 496         if (error) {
 497                 dev_err(&bt541->client->dev,
 498                         "Failed to enable regulators: %d\n", error);
 499                 return error;
 500         }
 501
 502         msleep(CHIP_ON_DELAY);
 503
 504         error = zinitix_send_power_on_sequence(bt541);
 505         if (error) {
 506                 dev_err(&bt541->client->dev,
 507                         "Error while sending power-on sequence: %d\n", error);
 508                 return error;
 509         }
 510
 511         error = zinitix_init_touch(bt541);
 512         if (error) {
 513                 dev_err(&bt541->client->dev,
 514                         "Error while configuring touch IC\n");
 515                 return error;
 516         }
 517
 518         enable_irq(bt541->client->irq);
 519
 520         return 0;
 521 }
 522
 523 static int zinitix_stop(struct bt541_ts_data *bt541)
 524 {
 525         int error;
 526
 527         disable_irq(bt541->client->irq);
 528
 529         error = regulator_bulk_disable(ARRAY_SIZE(bt541->supplies),
 530                                        bt541->supplies);
 531         if (error) {
 532                 dev_err(&bt541->client->dev,
 533                         "Failed to disable regulators: %d\n", error);
 534                 return error;
 535         }
 536
 537         return 0;
 538 }
 539
 540 static int zinitix_input_open(struct input_dev *dev)
 541 {
 542         struct bt541_ts_data *bt541 = input_get_drvdata(dev);
 543
 544         return zinitix_start(bt541);
 545 }
 546
 547 static void zinitix_input_close(struct input_dev *dev)
 548 {
 549         struct bt541_ts_data *bt541 = input_get_drvdata(dev);
 550
 551         zinitix_stop(bt541);
 552 }
 553
 554 static int zinitix_init_input_dev(struct bt541_ts_data *bt541)
 555 {
 556         struct input_dev *input_dev;
 557         int error;
 558         int i;
 559
 560         input_dev = devm_input_allocate_device(&bt541->client->dev);
 561         if (!input_dev) {
 562                 dev_err(&bt541->client->dev,
 563                         "Failed to allocate input device.");
 564                 return -ENOMEM;
 565         }
 566
 567         input_set_drvdata(input_dev, bt541);
 568         bt541->input_dev = input_dev;
 569
 570         input_dev->name = "Zinitix Capacitive TouchScreen";
 571         input_dev->phys = "input/ts";
 572         input_dev->id.bustype = BUS_I2C;
 573         input_dev->open = zinitix_input_open;
 574         input_dev->close = zinitix_input_close;
 575
 576         if (bt541->num_keycodes) {
 577                 input_dev->keycode = bt541->keycodes;
 578                 input_dev->keycodemax = bt541->num_keycodes;
 579                 input_dev->keycodesize = sizeof(bt541->keycodes[0]);
 580                 for (i = 0; i < bt541->num_keycodes; i++)
 581                         input_set_capability(input_dev, EV_KEY, bt541->keycodes[i]);
 582         }
 583
 584         input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X);
 585         input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y);
 586         input_set_abs_params(input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
 587         input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
 588
 589         touchscreen_parse_properties(input_dev, true, &bt541->prop);
 590         if (!bt541->prop.max_x || !bt541->prop.max_y) {
 591                 dev_err(&bt541->client->dev,
 592                         "Touchscreen-size-x and/or touchscreen-size-y not set in dts\n");
 593                 return -EINVAL;
 594         }
 595
 596         error = input_mt_init_slots(input_dev, MAX_SUPPORTED_FINGER_NUM,
 597                                     INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
 598         if (error) {
 599                 dev_err(&bt541->client->dev,
 600                         "Failed to initialize MT slots: %d", error);
 601                 return error;
 602         }
 603
 604         error = input_register_device(input_dev);
 605         if (error) {
 606                 dev_err(&bt541->client->dev,
 607                         "Failed to register input device: %d", error);
 608                 return error;
 609         }
 610
 611         return 0;
 612 }
 613
 614 static int zinitix_ts_probe(struct i2c_client *client)
 615 {
 616         struct bt541_ts_data *bt541;
 617         int error;
 618
 619         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 620                 dev_err(&client->dev,
 621                         "Failed to assert adapter's support for plain I2C.\n");
 622                 return -ENXIO;
 623         }
 624
 625         bt541 = devm_kzalloc(&client->dev, sizeof(*bt541), GFP_KERNEL);
 626         if (!bt541)
 627                 return -ENOMEM;
 628
 629         bt541->client = client;
 630         i2c_set_clientdata(client, bt541);
 631
 632         error = zinitix_init_regulators(bt541);
 633         if (error) {
 634                 dev_err(&client->dev,
 635                         "Failed to initialize regulators: %d\n", error);
 636                 return error;
 637         }
 638
 639         error = devm_request_threaded_irq(&client->dev, client->irq,
 640                                           NULL, zinitix_ts_irq_handler,
 641                                           IRQF_ONESHOT | IRQF_NO_AUTOEN,
 642                                           client->name, bt541);
 643         if (error) {
 644                 dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
 645                 return error;
 646         }
 647
 648         if (device_property_present(&client->dev, "linux,keycodes")) {
 649                 bt541->num_keycodes = device_property_count_u32(&client->dev,
 650                                                                 "linux,keycodes");
 651                 if (bt541->num_keycodes < 0) {
 652                         dev_err(&client->dev, "Failed to count keys (%d)\n",
 653                                 bt541->num_keycodes);
 654                         return bt541->num_keycodes;
 655                 } else if (bt541->num_keycodes > ARRAY_SIZE(bt541->keycodes)) {
 656                         dev_err(&client->dev, "Too many keys defined (%d)\n",
 657                                 bt541->num_keycodes);
 658                         return -EINVAL;
 659                 }
 660
 661                 error = device_property_read_u32_array(&client->dev,
 662                                                        "linux,keycodes",
 663                                                        bt541->keycodes,
 664                                                        bt541->num_keycodes);
 665                 if (error) {
 666                         dev_err(&client->dev,
 667                                 "Unable to parse \"linux,keycodes\" property: %d\n",
 668                                 error);
 669                         return error;
 670                 }
 671         }
 672
 673         error = zinitix_init_input_dev(bt541);
 674         if (error) {
 675                 dev_err(&client->dev,
 676                         "Failed to initialize input device: %d\n", error);
 677                 return error;
 678         }
 679
 680         error = device_property_read_u32(&client->dev, "zinitix,mode",
 681                                          &bt541->zinitix_mode);
 682         if (error < 0) {
 683                 /* fall back to mode 2 */
 684                 bt541->zinitix_mode = DEFAULT_TOUCH_POINT_MODE;
 685         }
 686
 687         if (bt541->zinitix_mode != 2) {
 688                 /*
 689                  * If there are devices that don't support mode 2, support
 690                  * for other modes (0, 1) will be needed.
 691                  */
 692                 dev_err(&client->dev,
 693                         "Malformed zinitix,mode property, must be 2 (supplied: %d)\n",
 694                         bt541->zinitix_mode);
 695                 return -EINVAL;
 696         }
 697
 698         return 0;
 699 }
 700
 701 static int zinitix_suspend(struct device *dev)
 702 {
 703         struct i2c_client *client = to_i2c_client(dev);
 704         struct bt541_ts_data *bt541 = i2c_get_clientdata(client);
 705
 706         mutex_lock(&bt541->input_dev->mutex);
 707
 708         if (input_device_enabled(bt541->input_dev))
 709                 zinitix_stop(bt541);
 710
 711         mutex_unlock(&bt541->input_dev->mutex);
 712
 713         return 0;
 714 }
 715
 716 static int zinitix_resume(struct device *dev)
 717 {
 718         struct i2c_client *client = to_i2c_client(dev);
 719         struct bt541_ts_data *bt541 = i2c_get_clientdata(client);
 720         int ret = 0;
 721
 722         mutex_lock(&bt541->input_dev->mutex);
 723
 724         if (input_device_enabled(bt541->input_dev))
 725                 ret = zinitix_start(bt541);
 726
 727         mutex_unlock(&bt541->input_dev->mutex);
 728
 729         return ret;
 730 }
 731
 732 static DEFINE_SIMPLE_DEV_PM_OPS(zinitix_pm_ops, zinitix_suspend, zinitix_resume);
 733
 734 #ifdef CONFIG_OF
 735 static const struct of_device_id zinitix_of_match[] = {
 736         { .compatible = "zinitix,bt402" },
 737         { .compatible = "zinitix,bt403" },
 738         { .compatible = "zinitix,bt404" },
 739         { .compatible = "zinitix,bt412" },
 740         { .compatible = "zinitix,bt413" },
 741         { .compatible = "zinitix,bt431" },
 742         { .compatible = "zinitix,bt432" },
 743         { .compatible = "zinitix,bt531" },
 744         { .compatible = "zinitix,bt532" },
 745         { .compatible = "zinitix,bt538" },
 746         { .compatible = "zinitix,bt541" },
 747         { .compatible = "zinitix,bt548" },
 748         { .compatible = "zinitix,bt554" },
 749         { .compatible = "zinitix,at100" },
 750         { }
 751 };
 752 MODULE_DEVICE_TABLE(of, zinitix_of_match);
 753 #endif
 754
 755 static struct i2c_driver zinitix_ts_driver = {
 756         .probe = zinitix_ts_probe,
 757         .driver = {
 758                 .name = "Zinitix-TS",
 759                 .pm = pm_sleep_ptr(&zinitix_pm_ops),
 760                 .of_match_table = of_match_ptr(zinitix_of_match),
 761         },
 762 };
 763 module_i2c_driver(zinitix_ts_driver);
 764
 765 MODULE_AUTHOR("Michael Srba <[email protected]>");
 766 MODULE_DESCRIPTION("Zinitix touchscreen driver");
 767 MODULE_LICENSE("GPL v2");