drivers/input/touchscreen/silead.c

   1 /* -------------------------------------------------------------------------
   2  * Copyright (C) 2014-2015, Intel Corporation
   3  *
   4  * Derived from:
   5  *  gslX68X.c
   6  *  Copyright (C) 2010-2015, Shanghai Sileadinc Co.Ltd
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  * -------------------------------------------------------------------------
  18  */
  19
  20 #include <linux/i2c.h>
  21 #include <linux/module.h>
  22 #include <linux/acpi.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/gpio/consumer.h>
  25 #include <linux/delay.h>
  26 #include <linux/firmware.h>
  27 #include <linux/input.h>
  28 #include <linux/input/mt.h>
  29 #include <linux/input/touchscreen.h>
  30 #include <linux/pm.h>
  31 #include <linux/irq.h>
  32
  33 #include <asm/unaligned.h>
  34
  35 #define SILEAD_TS_NAME          "silead_ts"
  36
  37 #define SILEAD_REG_RESET        0xE0
  38 #define SILEAD_REG_DATA         0x80
  39 #define SILEAD_REG_TOUCH_NR     0x80
  40 #define SILEAD_REG_POWER        0xBC
  41 #define SILEAD_REG_CLOCK        0xE4
  42 #define SILEAD_REG_STATUS       0xB0
  43 #define SILEAD_REG_ID           0xFC
  44 #define SILEAD_REG_MEM_CHECK    0xB0
  45
  46 #define SILEAD_STATUS_OK        0x5A5A5A5A
  47 #define SILEAD_TS_DATA_LEN      44
  48 #define SILEAD_CLOCK            0x04
  49
  50 #define SILEAD_CMD_RESET        0x88
  51 #define SILEAD_CMD_START        0x00
  52
  53 #define SILEAD_POINT_DATA_LEN   0x04
  54 #define SILEAD_POINT_Y_OFF      0x00
  55 #define SILEAD_POINT_Y_MSB_OFF  0x01
  56 #define SILEAD_POINT_X_OFF      0x02
  57 #define SILEAD_POINT_X_MSB_OFF  0x03
  58 #define SILEAD_TOUCH_ID_MASK    0xF0
  59
  60 #define SILEAD_CMD_SLEEP_MIN    10000
  61 #define SILEAD_CMD_SLEEP_MAX    20000
  62 #define SILEAD_POWER_SLEEP      20
  63 #define SILEAD_STARTUP_SLEEP    30
  64
  65 #define SILEAD_MAX_FINGERS      10
  66
  67 enum silead_ts_power {
  68         SILEAD_POWER_ON  = 1,
  69         SILEAD_POWER_OFF = 0
  70 };
  71
  72 struct silead_ts_data {
  73         struct i2c_client *client;
  74         struct gpio_desc *gpio_power;
  75         struct input_dev *input;
  76         char fw_name[64];
  77         struct touchscreen_properties prop;
  78         u32 max_fingers;
  79         u32 chip_id;
  80         struct input_mt_pos pos[SILEAD_MAX_FINGERS];
  81         int slots[SILEAD_MAX_FINGERS];
  82         int id[SILEAD_MAX_FINGERS];
  83 };
  84
  85 struct silead_fw_data {
  86         u32 offset;
  87         u32 val;
  88 };
  89
  90 static int silead_ts_request_input_dev(struct silead_ts_data *data)
  91 {
  92         struct device *dev = &data->client->dev;
  93         int error;
  94
  95         data->input = devm_input_allocate_device(dev);
  96         if (!data->input) {
  97                 dev_err(dev,
  98                         "Failed to allocate input device\n");
  99                 return -ENOMEM;
 100         }
 101
 102         input_set_abs_params(data->input, ABS_MT_POSITION_X, 0, 4095, 0, 0);
 103         input_set_abs_params(data->input, ABS_MT_POSITION_Y, 0, 4095, 0, 0);
 104         touchscreen_parse_properties(data->input, true, &data->prop);
 105
 106         input_mt_init_slots(data->input, data->max_fingers,
 107                             INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED |
 108                             INPUT_MT_TRACK);
 109
 110         data->input->name = SILEAD_TS_NAME;
 111         data->input->phys = "input/ts";
 112         data->input->id.bustype = BUS_I2C;
 113
 114         error = input_register_device(data->input);
 115         if (error) {
 116                 dev_err(dev, "Failed to register input device: %d\n", error);
 117                 return error;
 118         }
 119
 120         return 0;
 121 }
 122
 123 static void silead_ts_set_power(struct i2c_client *client,
 124                                 enum silead_ts_power state)
 125 {
 126         struct silead_ts_data *data = i2c_get_clientdata(client);
 127
 128         if (data->gpio_power) {
 129                 gpiod_set_value_cansleep(data->gpio_power, state);
 130                 msleep(SILEAD_POWER_SLEEP);
 131         }
 132 }
 133
 134 static void silead_ts_read_data(struct i2c_client *client)
 135 {
 136         struct silead_ts_data *data = i2c_get_clientdata(client);
 137         struct input_dev *input = data->input;
 138         struct device *dev = &client->dev;
 139         u8 *bufp, buf[SILEAD_TS_DATA_LEN];
 140         int touch_nr, error, i;
 141
 142         error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_DATA,
 143                                               SILEAD_TS_DATA_LEN, buf);
 144         if (error < 0) {
 145                 dev_err(dev, "Data read error %d\n", error);
 146                 return;
 147         }
 148
 149         touch_nr = buf[0];
 150         if (touch_nr > data->max_fingers) {
 151                 dev_warn(dev, "More touches reported then supported %d > %d\n",
 152                          touch_nr, data->max_fingers);
 153                 touch_nr = data->max_fingers;
 154         }
 155
 156         bufp = buf + SILEAD_POINT_DATA_LEN;
 157         for (i = 0; i < touch_nr; i++, bufp += SILEAD_POINT_DATA_LEN) {
 158                 /* Bits 4-7 are the touch id */
 159                 data->id[i] = (bufp[SILEAD_POINT_X_MSB_OFF] &
 160                                SILEAD_TOUCH_ID_MASK) >> 4;
 161                 touchscreen_set_mt_pos(&data->pos[i], &data->prop,
 162                         get_unaligned_le16(&bufp[SILEAD_POINT_X_OFF]) & 0xfff,
 163                         get_unaligned_le16(&bufp[SILEAD_POINT_Y_OFF]) & 0xfff);
 164         }
 165
 166         input_mt_assign_slots(input, data->slots, data->pos, touch_nr, 0);
 167
 168         for (i = 0; i < touch_nr; i++) {
 169                 input_mt_slot(input, data->slots[i]);
 170                 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
 171                 input_report_abs(input, ABS_MT_POSITION_X, data->pos[i].x);
 172                 input_report_abs(input, ABS_MT_POSITION_Y, data->pos[i].y);
 173
 174                 dev_dbg(dev, "x=%d y=%d hw_id=%d sw_id=%d\n", data->pos[i].x,
 175                         data->pos[i].y, data->id[i], data->slots[i]);
 176         }
 177
 178         input_mt_sync_frame(input);
 179         input_sync(input);
 180 }
 181
 182 static int silead_ts_init(struct i2c_client *client)
 183 {
 184         struct silead_ts_data *data = i2c_get_clientdata(client);
 185         int error;
 186
 187         error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
 188                                           SILEAD_CMD_RESET);
 189         if (error)
 190                 goto i2c_write_err;
 191         usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
 192
 193         error = i2c_smbus_write_byte_data(client, SILEAD_REG_TOUCH_NR,
 194                                         data->max_fingers);
 195         if (error)
 196                 goto i2c_write_err;
 197         usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
 198
 199         error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
 200                                           SILEAD_CLOCK);
 201         if (error)
 202                 goto i2c_write_err;
 203         usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
 204
 205         error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
 206                                           SILEAD_CMD_START);
 207         if (error)
 208                 goto i2c_write_err;
 209         usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
 210
 211         return 0;
 212
 213 i2c_write_err:
 214         dev_err(&client->dev, "Registers clear error %d\n", error);
 215         return error;
 216 }
 217
 218 static int silead_ts_reset(struct i2c_client *client)
 219 {
 220         int error;
 221
 222         error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
 223                                           SILEAD_CMD_RESET);
 224         if (error)
 225                 goto i2c_write_err;
 226         usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
 227
 228         error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
 229                                           SILEAD_CLOCK);
 230         if (error)
 231                 goto i2c_write_err;
 232         usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
 233
 234         error = i2c_smbus_write_byte_data(client, SILEAD_REG_POWER,
 235                                           SILEAD_CMD_START);
 236         if (error)
 237                 goto i2c_write_err;
 238         usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
 239
 240         return 0;
 241
 242 i2c_write_err:
 243         dev_err(&client->dev, "Chip reset error %d\n", error);
 244         return error;
 245 }
 246
 247 static int silead_ts_startup(struct i2c_client *client)
 248 {
 249         int error;
 250
 251         error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 0x00);
 252         if (error) {
 253                 dev_err(&client->dev, "Startup error %d\n", error);
 254                 return error;
 255         }
 256
 257         msleep(SILEAD_STARTUP_SLEEP);
 258
 259         return 0;
 260 }
 261
 262 static int silead_ts_load_fw(struct i2c_client *client)
 263 {
 264         struct device *dev = &client->dev;
 265         struct silead_ts_data *data = i2c_get_clientdata(client);
 266         unsigned int fw_size, i;
 267         const struct firmware *fw;
 268         struct silead_fw_data *fw_data;
 269         int error;
 270
 271         dev_dbg(dev, "Firmware file name: %s", data->fw_name);
 272
 273         error = request_firmware(&fw, data->fw_name, dev);
 274         if (error) {
 275                 dev_err(dev, "Firmware request error %d\n", error);
 276                 return error;
 277         }
 278
 279         fw_size = fw->size / sizeof(*fw_data);
 280         fw_data = (struct silead_fw_data *)fw->data;
 281
 282         for (i = 0; i < fw_size; i++) {
 283                 error = i2c_smbus_write_i2c_block_data(client,
 284                                                        fw_data[i].offset,
 285                                                        4,
 286                                                        (u8 *)&fw_data[i].val);
 287                 if (error) {
 288                         dev_err(dev, "Firmware load error %d\n", error);
 289                         break;
 290                 }
 291         }
 292
 293         release_firmware(fw);
 294         return error ?: 0;
 295 }
 296
 297 static u32 silead_ts_get_status(struct i2c_client *client)
 298 {
 299         int error;
 300         __le32 status;
 301
 302         error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_STATUS,
 303                                               sizeof(status), (u8 *)&status);
 304         if (error < 0) {
 305                 dev_err(&client->dev, "Status read error %d\n", error);
 306                 return error;
 307         }
 308
 309         return le32_to_cpu(status);
 310 }
 311
 312 static int silead_ts_get_id(struct i2c_client *client)
 313 {
 314         struct silead_ts_data *data = i2c_get_clientdata(client);
 315         __le32 chip_id;
 316         int error;
 317
 318         error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_ID,
 319                                               sizeof(chip_id), (u8 *)&chip_id);
 320         if (error < 0) {
 321                 dev_err(&client->dev, "Chip ID read error %d\n", error);
 322                 return error;
 323         }
 324
 325         data->chip_id = le32_to_cpu(chip_id);
 326         dev_info(&client->dev, "Silead chip ID: 0x%8X", data->chip_id);
 327
 328         return 0;
 329 }
 330
 331 static int silead_ts_setup(struct i2c_client *client)
 332 {
 333         int error;
 334         u32 status;
 335
 336         silead_ts_set_power(client, SILEAD_POWER_OFF);
 337         silead_ts_set_power(client, SILEAD_POWER_ON);
 338
 339         error = silead_ts_get_id(client);
 340         if (error)
 341                 return error;
 342
 343         error = silead_ts_init(client);
 344         if (error)
 345                 return error;
 346
 347         error = silead_ts_reset(client);
 348         if (error)
 349                 return error;
 350
 351         error = silead_ts_load_fw(client);
 352         if (error)
 353                 return error;
 354
 355         error = silead_ts_startup(client);
 356         if (error)
 357                 return error;
 358
 359         status = silead_ts_get_status(client);
 360         if (status != SILEAD_STATUS_OK) {
 361                 dev_err(&client->dev,
 362                         "Initialization error, status: 0x%X\n", status);
 363                 return -ENODEV;
 364         }
 365
 366         return 0;
 367 }
 368
 369 static irqreturn_t silead_ts_threaded_irq_handler(int irq, void *id)
 370 {
 371         struct silead_ts_data *data = id;
 372         struct i2c_client *client = data->client;
 373
 374         silead_ts_read_data(client);
 375
 376         return IRQ_HANDLED;
 377 }
 378
 379 static void silead_ts_read_props(struct i2c_client *client)
 380 {
 381         struct silead_ts_data *data = i2c_get_clientdata(client);
 382         struct device *dev = &client->dev;
 383         const char *str;
 384         int error;
 385
 386         error = device_property_read_u32(dev, "silead,max-fingers",
 387                                          &data->max_fingers);
 388         if (error) {
 389                 dev_dbg(dev, "Max fingers read error %d\n", error);
 390                 data->max_fingers = 5; /* Most devices handle up-to 5 fingers */
 391         }
 392
 393         error = device_property_read_string(dev, "touchscreen-fw-name", &str);
 394         if (!error)
 395                 snprintf(data->fw_name, sizeof(data->fw_name), "%s", str);
 396         else
 397                 dev_dbg(dev, "Firmware file name read error. Using default.");
 398 }
 399
 400 #ifdef CONFIG_ACPI
 401 static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
 402                                          const struct i2c_device_id *id)
 403 {
 404         const struct acpi_device_id *acpi_id;
 405         struct device *dev = &data->client->dev;
 406         int i;
 407
 408         if (ACPI_HANDLE(dev)) {
 409                 acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
 410                 if (!acpi_id)
 411                         return -ENODEV;
 412
 413                 snprintf(data->fw_name, sizeof(data->fw_name), "%s.fw",
 414                         acpi_id->id);
 415
 416                 for (i = 0; i < strlen(data->fw_name); i++)
 417                         data->fw_name[i] = tolower(data->fw_name[i]);
 418         } else {
 419                 snprintf(data->fw_name, sizeof(data->fw_name), "%s.fw",
 420                         id->name);
 421         }
 422
 423         return 0;
 424 }
 425 #else
 426 static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
 427                                          const struct i2c_device_id *id)
 428 {
 429         snprintf(data->fw_name, sizeof(data->fw_name), "%s.fw", id->name);
 430         return 0;
 431 }
 432 #endif
 433
 434 static int silead_ts_probe(struct i2c_client *client,
 435                            const struct i2c_device_id *id)
 436 {
 437         struct silead_ts_data *data;
 438         struct device *dev = &client->dev;
 439         int error;
 440
 441         if (!i2c_check_functionality(client->adapter,
 442                                      I2C_FUNC_I2C |
 443                                      I2C_FUNC_SMBUS_READ_I2C_BLOCK |
 444                                      I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) {
 445                 dev_err(dev, "I2C functionality check failed\n");
 446                 return -ENXIO;
 447         }
 448
 449         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 450         if (!data)
 451                 return -ENOMEM;
 452
 453         i2c_set_clientdata(client, data);
 454         data->client = client;
 455
 456         error = silead_ts_set_default_fw_name(data, id);
 457         if (error)
 458                 return error;
 459
 460         silead_ts_read_props(client);
 461
 462         /* We must have the IRQ provided by DT or ACPI subsytem */
 463         if (client->irq <= 0)
 464                 return -ENODEV;
 465
 466         /* Power GPIO pin */
 467         data->gpio_power = gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
 468         if (IS_ERR(data->gpio_power)) {
 469                 if (PTR_ERR(data->gpio_power) != -EPROBE_DEFER)
 470                         dev_err(dev, "Shutdown GPIO request failed\n");
 471                 return PTR_ERR(data->gpio_power);
 472         }
 473
 474         error = silead_ts_setup(client);
 475         if (error)
 476                 return error;
 477
 478         error = silead_ts_request_input_dev(data);
 479         if (error)
 480                 return error;
 481
 482         error = devm_request_threaded_irq(dev, client->irq,
 483                                           NULL, silead_ts_threaded_irq_handler,
 484                                           IRQF_ONESHOT, client->name, data);
 485         if (error) {
 486                 if (error != -EPROBE_DEFER)
 487                         dev_err(dev, "IRQ request failed %d\n", error);
 488                 return error;
 489         }
 490
 491         return 0;
 492 }
 493
 494 static int __maybe_unused silead_ts_suspend(struct device *dev)
 495 {
 496         struct i2c_client *client = to_i2c_client(dev);
 497
 498         silead_ts_set_power(client, SILEAD_POWER_OFF);
 499         return 0;
 500 }
 501
 502 static int __maybe_unused silead_ts_resume(struct device *dev)
 503 {
 504         struct i2c_client *client = to_i2c_client(dev);
 505         int error, status;
 506
 507         silead_ts_set_power(client, SILEAD_POWER_ON);
 508
 509         error = silead_ts_reset(client);
 510         if (error)
 511                 return error;
 512
 513         error = silead_ts_startup(client);
 514         if (error)
 515                 return error;
 516
 517         status = silead_ts_get_status(client);
 518         if (status != SILEAD_STATUS_OK) {
 519                 dev_err(dev, "Resume error, status: 0x%02x\n", status);
 520                 return -ENODEV;
 521         }
 522
 523         return 0;
 524 }
 525
 526 static SIMPLE_DEV_PM_OPS(silead_ts_pm, silead_ts_suspend, silead_ts_resume);
 527
 528 static const struct i2c_device_id silead_ts_id[] = {
 529         { "gsl1680", 0 },
 530         { "gsl1688", 0 },
 531         { "gsl3670", 0 },
 532         { "gsl3675", 0 },
 533         { "gsl3692", 0 },
 534         { "mssl1680", 0 },
 535         { }
 536 };
 537 MODULE_DEVICE_TABLE(i2c, silead_ts_id);
 538
 539 #ifdef CONFIG_ACPI
 540 static const struct acpi_device_id silead_ts_acpi_match[] = {
 541         { "GSL1680", 0 },
 542         { "GSL1688", 0 },
 543         { "GSL3670", 0 },
 544         { "GSL3675", 0 },
 545         { "GSL3692", 0 },
 546         { "MSSL1680", 0 },
 547         { }
 548 };
 549 MODULE_DEVICE_TABLE(acpi, silead_ts_acpi_match);
 550 #endif
 551
 552 static struct i2c_driver silead_ts_driver = {
 553         .probe = silead_ts_probe,
 554         .id_table = silead_ts_id,
 555         .driver = {
 556                 .name = SILEAD_TS_NAME,
 557                 .acpi_match_table = ACPI_PTR(silead_ts_acpi_match),
 558                 .pm = &silead_ts_pm,
 559         },
 560 };
 561 module_i2c_driver(silead_ts_driver);
 562
 563 MODULE_AUTHOR("Robert Dolca <robert.dolca@intel.com>");
 564 MODULE_DESCRIPTION("Silead I2C touchscreen driver");
 565 MODULE_LICENSE("GPL");