drivers/input/touchscreen/goodix.c

   1 /*
   2  *  Driver for Goodix Touchscreens
   3  *
   4  *  Copyright (c) 2014 Red Hat Inc.
   5  *  Copyright (c) 2015 K. Merker <merker@debian.org>
   6  *
   7  *  This code is based on gt9xx.c authored by andrew@goodix.com:
   8  *
   9  *  2010 - 2012 Goodix Technology.
  10  */
  11
  12 /*
  13  * This program is free software; you can redistribute it and/or modify it
  14  * under the terms of the GNU General Public License as published by the Free
  15  * Software Foundation; version 2 of the License.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/dmi.h>
  20 #include <linux/firmware.h>
  21 #include <linux/gpio/consumer.h>
  22 #include <linux/i2c.h>
  23 #include <linux/input.h>
  24 #include <linux/input/mt.h>
  25 #include <linux/input/touchscreen.h>
  26 #include <linux/module.h>
  27 #include <linux/delay.h>
  28 #include <linux/irq.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/slab.h>
  31 #include <linux/acpi.h>
  32 #include <linux/of.h>
  33 #include <asm/unaligned.h>
  34
  35 struct goodix_ts_data;
  36
  37 struct goodix_chip_data {
  38         u16 config_addr;
  39         int config_len;
  40         int (*check_config)(struct goodix_ts_data *, const struct firmware *);
  41 };
  42
  43 struct goodix_ts_data {
  44         struct i2c_client *client;
  45         struct input_dev *input_dev;
  46         const struct goodix_chip_data *chip;
  47         struct touchscreen_properties prop;
  48         unsigned int max_touch_num;
  49         unsigned int int_trigger_type;
  50         struct gpio_desc *gpiod_int;
  51         struct gpio_desc *gpiod_rst;
  52         u16 id;
  53         u16 version;
  54         const char *cfg_name;
  55         struct completion firmware_loading_complete;
  56         unsigned long irq_flags;
  57 };
  58
  59 #define GOODIX_GPIO_INT_NAME            "irq"
  60 #define GOODIX_GPIO_RST_NAME            "reset"
  61
  62 #define GOODIX_MAX_HEIGHT               4096
  63 #define GOODIX_MAX_WIDTH                4096
  64 #define GOODIX_INT_TRIGGER              1
  65 #define GOODIX_CONTACT_SIZE             8
  66 #define GOODIX_MAX_CONTACTS             10
  67
  68 #define GOODIX_CONFIG_MAX_LENGTH        240
  69 #define GOODIX_CONFIG_911_LENGTH        186
  70 #define GOODIX_CONFIG_967_LENGTH        228
  71
  72 /* Register defines */
  73 #define GOODIX_REG_COMMAND              0x8040
  74 #define GOODIX_CMD_SCREEN_OFF           0x05
  75
  76 #define GOODIX_READ_COOR_ADDR           0x814E
  77 #define GOODIX_GT1X_REG_CONFIG_DATA     0x8050
  78 #define GOODIX_GT9X_REG_CONFIG_DATA     0x8047
  79 #define GOODIX_REG_ID                   0x8140
  80
  81 #define GOODIX_BUFFER_STATUS_READY      BIT(7)
  82 #define GOODIX_BUFFER_STATUS_TIMEOUT    20
  83
  84 #define RESOLUTION_LOC          1
  85 #define MAX_CONTACTS_LOC        5
  86 #define TRIGGER_LOC             6
  87
  88 static int goodix_check_cfg_8(struct goodix_ts_data *ts,
  89                         const struct firmware *cfg);
  90 static int goodix_check_cfg_16(struct goodix_ts_data *ts,
  91                         const struct firmware *cfg);
  92
  93 static const struct goodix_chip_data gt1x_chip_data = {
  94         .config_addr            = GOODIX_GT1X_REG_CONFIG_DATA,
  95         .config_len             = GOODIX_CONFIG_MAX_LENGTH,
  96         .check_config           = goodix_check_cfg_16,
  97 };
  98
  99 static const struct goodix_chip_data gt911_chip_data = {
 100         .config_addr            = GOODIX_GT9X_REG_CONFIG_DATA,
 101         .config_len             = GOODIX_CONFIG_911_LENGTH,
 102         .check_config           = goodix_check_cfg_8,
 103 };
 104
 105 static const struct goodix_chip_data gt967_chip_data = {
 106         .config_addr            = GOODIX_GT9X_REG_CONFIG_DATA,
 107         .config_len             = GOODIX_CONFIG_967_LENGTH,
 108         .check_config           = goodix_check_cfg_8,
 109 };
 110
 111 static const struct goodix_chip_data gt9x_chip_data = {
 112         .config_addr            = GOODIX_GT9X_REG_CONFIG_DATA,
 113         .config_len             = GOODIX_CONFIG_MAX_LENGTH,
 114         .check_config           = goodix_check_cfg_8,
 115 };
 116
 117 static const unsigned long goodix_irq_flags[] = {
 118         IRQ_TYPE_EDGE_RISING,
 119         IRQ_TYPE_EDGE_FALLING,
 120         IRQ_TYPE_LEVEL_LOW,
 121         IRQ_TYPE_LEVEL_HIGH,
 122 };
 123
 124 /*
 125  * Those tablets have their coordinates origin at the bottom right
 126  * of the tablet, as if rotated 180 degrees
 127  */
 128 static const struct dmi_system_id rotated_screen[] = {
 129 #if defined(CONFIG_DMI) && defined(CONFIG_X86)
 130         {
 131                 .ident = "WinBook TW100",
 132                 .matches = {
 133                         DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
 134                         DMI_MATCH(DMI_PRODUCT_NAME, "TW100")
 135                 }
 136         },
 137         {
 138                 .ident = "WinBook TW700",
 139                 .matches = {
 140                         DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
 141                         DMI_MATCH(DMI_PRODUCT_NAME, "TW700")
 142                 },
 143         },
 144 #endif
 145         {}
 146 };
 147
 148 /**
 149  * goodix_i2c_read - read data from a register of the i2c slave device.
 150  *
 151  * @client: i2c device.
 152  * @reg: the register to read from.
 153  * @buf: raw write data buffer.
 154  * @len: length of the buffer to write
 155  */
 156 static int goodix_i2c_read(struct i2c_client *client,
 157                            u16 reg, u8 *buf, int len)
 158 {
 159         struct i2c_msg msgs[2];
 160         __be16 wbuf = cpu_to_be16(reg);
 161         int ret;
 162
 163         msgs[0].flags = 0;
 164         msgs[0].addr  = client->addr;
 165         msgs[0].len   = 2;
 166         msgs[0].buf   = (u8 *)&wbuf;
 167
 168         msgs[1].flags = I2C_M_RD;
 169         msgs[1].addr  = client->addr;
 170         msgs[1].len   = len;
 171         msgs[1].buf   = buf;
 172
 173         ret = i2c_transfer(client->adapter, msgs, 2);
 174         return ret < 0 ? ret : (ret != ARRAY_SIZE(msgs) ? -EIO : 0);
 175 }
 176
 177 /**
 178  * goodix_i2c_write - write data to a register of the i2c slave device.
 179  *
 180  * @client: i2c device.
 181  * @reg: the register to write to.
 182  * @buf: raw data buffer to write.
 183  * @len: length of the buffer to write
 184  */
 185 static int goodix_i2c_write(struct i2c_client *client, u16 reg, const u8 *buf,
 186                             unsigned len)
 187 {
 188         u8 *addr_buf;
 189         struct i2c_msg msg;
 190         int ret;
 191
 192         addr_buf = kmalloc(len + 2, GFP_KERNEL);
 193         if (!addr_buf)
 194                 return -ENOMEM;
 195
 196         addr_buf[0] = reg >> 8;
 197         addr_buf[1] = reg & 0xFF;
 198         memcpy(&addr_buf[2], buf, len);
 199
 200         msg.flags = 0;
 201         msg.addr = client->addr;
 202         msg.buf = addr_buf;
 203         msg.len = len + 2;
 204
 205         ret = i2c_transfer(client->adapter, &msg, 1);
 206         kfree(addr_buf);
 207         return ret < 0 ? ret : (ret != 1 ? -EIO : 0);
 208 }
 209
 210 static int goodix_i2c_write_u8(struct i2c_client *client, u16 reg, u8 value)
 211 {
 212         return goodix_i2c_write(client, reg, &value, sizeof(value));
 213 }
 214
 215 static const struct goodix_chip_data *goodix_get_chip_data(u16 id)
 216 {
 217         switch (id) {
 218         case 1151:
 219                 return &gt1x_chip_data;
 220
 221         case 911:
 222         case 9271:
 223         case 9110:
 224         case 927:
 225         case 928:
 226                 return &gt911_chip_data;
 227
 228         case 912:
 229         case 967:
 230                 return &gt967_chip_data;
 231
 232         default:
 233                 return &gt9x_chip_data;
 234         }
 235 }
 236
 237 static int goodix_ts_read_input_report(struct goodix_ts_data *ts, u8 *data)
 238 {
 239         unsigned long max_timeout;
 240         int touch_num;
 241         int error;
 242
 243         /*
 244          * The 'buffer status' bit, which indicates that the data is valid, is
 245          * not set as soon as the interrupt is raised, but slightly after.
 246          * This takes around 10 ms to happen, so we poll for 20 ms.
 247          */
 248         max_timeout = jiffies + msecs_to_jiffies(GOODIX_BUFFER_STATUS_TIMEOUT);
 249         do {
 250                 error = goodix_i2c_read(ts->client, GOODIX_READ_COOR_ADDR,
 251                                         data, GOODIX_CONTACT_SIZE + 1);
 252                 if (error) {
 253                         dev_err(&ts->client->dev, "I2C transfer error: %d\n",
 254                                         error);
 255                         return error;
 256                 }
 257
 258                 if (data[0] & GOODIX_BUFFER_STATUS_READY) {
 259                         touch_num = data[0] & 0x0f;
 260                         if (touch_num > ts->max_touch_num)
 261                                 return -EPROTO;
 262
 263                         if (touch_num > 1) {
 264                                 data += 1 + GOODIX_CONTACT_SIZE;
 265                                 error = goodix_i2c_read(ts->client,
 266                                                 GOODIX_READ_COOR_ADDR +
 267                                                         1 + GOODIX_CONTACT_SIZE,
 268                                                 data,
 269                                                 GOODIX_CONTACT_SIZE *
 270                                                         (touch_num - 1));
 271                                 if (error)
 272                                         return error;
 273                         }
 274
 275                         return touch_num;
 276                 }
 277
 278                 usleep_range(1000, 2000); /* Poll every 1 - 2 ms */
 279         } while (time_before(jiffies, max_timeout));
 280
 281         /*
 282          * The Goodix panel will send spurious interrupts after a
 283          * 'finger up' event, which will always cause a timeout.
 284          */
 285         return 0;
 286 }
 287
 288 static void goodix_ts_report_touch(struct goodix_ts_data *ts, u8 *coor_data)
 289 {
 290         int id = coor_data[0] & 0x0F;
 291         int input_x = get_unaligned_le16(&coor_data[1]);
 292         int input_y = get_unaligned_le16(&coor_data[3]);
 293         int input_w = get_unaligned_le16(&coor_data[5]);
 294
 295         input_mt_slot(ts->input_dev, id);
 296         input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true);
 297         touchscreen_report_pos(ts->input_dev, &ts->prop,
 298                                input_x, input_y, true);
 299         input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, input_w);
 300         input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w);
 301 }
 302
 303 /**
 304  * goodix_process_events - Process incoming events
 305  *
 306  * @ts: our goodix_ts_data pointer
 307  *
 308  * Called when the IRQ is triggered. Read the current device state, and push
 309  * the input events to the user space.
 310  */
 311 static void goodix_process_events(struct goodix_ts_data *ts)
 312 {
 313         u8  point_data[1 + GOODIX_CONTACT_SIZE * GOODIX_MAX_CONTACTS];
 314         int touch_num;
 315         int i;
 316
 317         touch_num = goodix_ts_read_input_report(ts, point_data);
 318         if (touch_num < 0)
 319                 return;
 320
 321         /*
 322          * Bit 4 of the first byte reports the status of the capacitive
 323          * Windows/Home button.
 324          */
 325         input_report_key(ts->input_dev, KEY_LEFTMETA, point_data[0] & BIT(4));
 326
 327         for (i = 0; i < touch_num; i++)
 328                 goodix_ts_report_touch(ts,
 329                                 &point_data[1 + GOODIX_CONTACT_SIZE * i]);
 330
 331         input_mt_sync_frame(ts->input_dev);
 332         input_sync(ts->input_dev);
 333 }
 334
 335 /**
 336  * goodix_ts_irq_handler - The IRQ handler
 337  *
 338  * @irq: interrupt number.
 339  * @dev_id: private data pointer.
 340  */
 341 static irqreturn_t goodix_ts_irq_handler(int irq, void *dev_id)
 342 {
 343         struct goodix_ts_data *ts = dev_id;
 344
 345         goodix_process_events(ts);
 346
 347         if (goodix_i2c_write_u8(ts->client, GOODIX_READ_COOR_ADDR, 0) < 0)
 348                 dev_err(&ts->client->dev, "I2C write end_cmd error\n");
 349
 350         return IRQ_HANDLED;
 351 }
 352
 353 static void goodix_free_irq(struct goodix_ts_data *ts)
 354 {
 355         devm_free_irq(&ts->client->dev, ts->client->irq, ts);
 356 }
 357
 358 static int goodix_request_irq(struct goodix_ts_data *ts)
 359 {
 360         return devm_request_threaded_irq(&ts->client->dev, ts->client->irq,
 361                                          NULL, goodix_ts_irq_handler,
 362                                          ts->irq_flags, ts->client->name, ts);
 363 }
 364
 365 static int goodix_check_cfg_8(struct goodix_ts_data *ts,
 366                         const struct firmware *cfg)
 367 {
 368         int i, raw_cfg_len = cfg->size - 2;
 369         u8 check_sum = 0;
 370
 371         for (i = 0; i < raw_cfg_len; i++)
 372                 check_sum += cfg->data[i];
 373         check_sum = (~check_sum) + 1;
 374         if (check_sum != cfg->data[raw_cfg_len]) {
 375                 dev_err(&ts->client->dev,
 376                         "The checksum of the config fw is not correct");
 377                 return -EINVAL;
 378         }
 379
 380         if (cfg->data[raw_cfg_len + 1] != 1) {
 381                 dev_err(&ts->client->dev,
 382                         "Config fw must have Config_Fresh register set");
 383                 return -EINVAL;
 384         }
 385
 386         return 0;
 387 }
 388
 389 static int goodix_check_cfg_16(struct goodix_ts_data *ts,
 390                         const struct firmware *cfg)
 391 {
 392         int i, raw_cfg_len = cfg->size - 3;
 393         u16 check_sum = 0;
 394
 395         for (i = 0; i < raw_cfg_len; i += 2)
 396                 check_sum += get_unaligned_be16(&cfg->data[i]);
 397         check_sum = (~check_sum) + 1;
 398         if (check_sum != get_unaligned_be16(&cfg->data[raw_cfg_len])) {
 399                 dev_err(&ts->client->dev,
 400                         "The checksum of the config fw is not correct");
 401                 return -EINVAL;
 402         }
 403
 404         if (cfg->data[raw_cfg_len + 2] != 1) {
 405                 dev_err(&ts->client->dev,
 406                         "Config fw must have Config_Fresh register set");
 407                 return -EINVAL;
 408         }
 409
 410         return 0;
 411 }
 412
 413 /**
 414  * goodix_check_cfg - Checks if config fw is valid
 415  *
 416  * @ts: goodix_ts_data pointer
 417  * @cfg: firmware config data
 418  */
 419 static int goodix_check_cfg(struct goodix_ts_data *ts,
 420                             const struct firmware *cfg)
 421 {
 422         if (cfg->size > GOODIX_CONFIG_MAX_LENGTH) {
 423                 dev_err(&ts->client->dev,
 424                         "The length of the config fw is not correct");
 425                 return -EINVAL;
 426         }
 427
 428         return ts->chip->check_config(ts, cfg);
 429 }
 430
 431 /**
 432  * goodix_send_cfg - Write fw config to device
 433  *
 434  * @ts: goodix_ts_data pointer
 435  * @cfg: config firmware to write to device
 436  */
 437 static int goodix_send_cfg(struct goodix_ts_data *ts,
 438                            const struct firmware *cfg)
 439 {
 440         int error;
 441
 442         error = goodix_check_cfg(ts, cfg);
 443         if (error)
 444                 return error;
 445
 446         error = goodix_i2c_write(ts->client, ts->chip->config_addr, cfg->data,
 447                                  cfg->size);
 448         if (error) {
 449                 dev_err(&ts->client->dev, "Failed to write config data: %d",
 450                         error);
 451                 return error;
 452         }
 453         dev_dbg(&ts->client->dev, "Config sent successfully.");
 454
 455         /* Let the firmware reconfigure itself, so sleep for 10ms */
 456         usleep_range(10000, 11000);
 457
 458         return 0;
 459 }
 460
 461 static int goodix_int_sync(struct goodix_ts_data *ts)
 462 {
 463         int error;
 464
 465         error = gpiod_direction_output(ts->gpiod_int, 0);
 466         if (error)
 467                 return error;
 468
 469         msleep(50);                             /* T5: 50ms */
 470
 471         error = gpiod_direction_input(ts->gpiod_int);
 472         if (error)
 473                 return error;
 474
 475         return 0;
 476 }
 477
 478 /**
 479  * goodix_reset - Reset device during power on
 480  *
 481  * @ts: goodix_ts_data pointer
 482  */
 483 static int goodix_reset(struct goodix_ts_data *ts)
 484 {
 485         int error;
 486
 487         /* begin select I2C slave addr */
 488         error = gpiod_direction_output(ts->gpiod_rst, 0);
 489         if (error)
 490                 return error;
 491
 492         msleep(20);                             /* T2: > 10ms */
 493
 494         /* HIGH: 0x28/0x29, LOW: 0xBA/0xBB */
 495         error = gpiod_direction_output(ts->gpiod_int, ts->client->addr == 0x14);
 496         if (error)
 497                 return error;
 498
 499         usleep_range(100, 2000);                /* T3: > 100us */
 500
 501         error = gpiod_direction_output(ts->gpiod_rst, 1);
 502         if (error)
 503                 return error;
 504
 505         usleep_range(6000, 10000);              /* T4: > 5ms */
 506
 507         /* end select I2C slave addr */
 508         error = gpiod_direction_input(ts->gpiod_rst);
 509         if (error)
 510                 return error;
 511
 512         error = goodix_int_sync(ts);
 513         if (error)
 514                 return error;
 515
 516         return 0;
 517 }
 518
 519 /**
 520  * goodix_get_gpio_config - Get GPIO config from ACPI/DT
 521  *
 522  * @ts: goodix_ts_data pointer
 523  */
 524 static int goodix_get_gpio_config(struct goodix_ts_data *ts)
 525 {
 526         int error;
 527         struct device *dev;
 528         struct gpio_desc *gpiod;
 529
 530         if (!ts->client)
 531                 return -EINVAL;
 532         dev = &ts->client->dev;
 533
 534         /* Get the interrupt GPIO pin number */
 535         gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_INT_NAME, GPIOD_IN);
 536         if (IS_ERR(gpiod)) {
 537                 error = PTR_ERR(gpiod);
 538                 if (error != -EPROBE_DEFER)
 539                         dev_dbg(dev, "Failed to get %s GPIO: %d\n",
 540                                 GOODIX_GPIO_INT_NAME, error);
 541                 return error;
 542         }
 543
 544         ts->gpiod_int = gpiod;
 545
 546         /* Get the reset line GPIO pin number */
 547         gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_RST_NAME, GPIOD_IN);
 548         if (IS_ERR(gpiod)) {
 549                 error = PTR_ERR(gpiod);
 550                 if (error != -EPROBE_DEFER)
 551                         dev_dbg(dev, "Failed to get %s GPIO: %d\n",
 552                                 GOODIX_GPIO_RST_NAME, error);
 553                 return error;
 554         }
 555
 556         ts->gpiod_rst = gpiod;
 557
 558         return 0;
 559 }
 560
 561 /**
 562  * goodix_read_config - Read the embedded configuration of the panel
 563  *
 564  * @ts: our goodix_ts_data pointer
 565  *
 566  * Must be called during probe
 567  */
 568 static void goodix_read_config(struct goodix_ts_data *ts)
 569 {
 570         u8 config[GOODIX_CONFIG_MAX_LENGTH];
 571         int x_max, y_max;
 572         int error;
 573
 574         error = goodix_i2c_read(ts->client, ts->chip->config_addr,
 575                                 config, ts->chip->config_len);
 576         if (error) {
 577                 dev_warn(&ts->client->dev, "Error reading config: %d\n",
 578                          error);
 579                 ts->int_trigger_type = GOODIX_INT_TRIGGER;
 580                 ts->max_touch_num = GOODIX_MAX_CONTACTS;
 581                 return;
 582         }
 583
 584         ts->int_trigger_type = config[TRIGGER_LOC] & 0x03;
 585         ts->max_touch_num = config[MAX_CONTACTS_LOC] & 0x0f;
 586
 587         x_max = get_unaligned_le16(&config[RESOLUTION_LOC]);
 588         y_max = get_unaligned_le16(&config[RESOLUTION_LOC + 2]);
 589         if (x_max && y_max) {
 590                 input_abs_set_max(ts->input_dev, ABS_MT_POSITION_X, x_max - 1);
 591                 input_abs_set_max(ts->input_dev, ABS_MT_POSITION_Y, y_max - 1);
 592         }
 593 }
 594
 595 /**
 596  * goodix_read_version - Read goodix touchscreen version
 597  *
 598  * @ts: our goodix_ts_data pointer
 599  */
 600 static int goodix_read_version(struct goodix_ts_data *ts)
 601 {
 602         int error;
 603         u8 buf[6];
 604         char id_str[5];
 605
 606         error = goodix_i2c_read(ts->client, GOODIX_REG_ID, buf, sizeof(buf));
 607         if (error) {
 608                 dev_err(&ts->client->dev, "read version failed: %d\n", error);
 609                 return error;
 610         }
 611
 612         memcpy(id_str, buf, 4);
 613         id_str[4] = 0;
 614         if (kstrtou16(id_str, 10, &ts->id))
 615                 ts->id = 0x1001;
 616
 617         ts->version = get_unaligned_le16(&buf[4]);
 618
 619         dev_info(&ts->client->dev, "ID %d, version: %04x\n", ts->id,
 620                  ts->version);
 621
 622         return 0;
 623 }
 624
 625 /**
 626  * goodix_i2c_test - I2C test function to check if the device answers.
 627  *
 628  * @client: the i2c client
 629  */
 630 static int goodix_i2c_test(struct i2c_client *client)
 631 {
 632         int retry = 0;
 633         int error;
 634         u8 test;
 635
 636         while (retry++ < 2) {
 637                 error = goodix_i2c_read(client, GOODIX_REG_ID,
 638                                         &test, 1);
 639                 if (!error)
 640                         return 0;
 641
 642                 dev_err(&client->dev, "i2c test failed attempt %d: %d\n",
 643                         retry, error);
 644                 msleep(20);
 645         }
 646
 647         return error;
 648 }
 649
 650 /**
 651  * goodix_configure_dev - Finish device initialization
 652  *
 653  * @ts: our goodix_ts_data pointer
 654  *
 655  * Must be called from probe to finish initialization of the device.
 656  * Contains the common initialization code for both devices that
 657  * declare gpio pins and devices that do not. It is either called
 658  * directly from probe or from request_firmware_wait callback.
 659  */
 660 static int goodix_configure_dev(struct goodix_ts_data *ts)
 661 {
 662         int error;
 663
 664         ts->int_trigger_type = GOODIX_INT_TRIGGER;
 665         ts->max_touch_num = GOODIX_MAX_CONTACTS;
 666
 667         ts->input_dev = devm_input_allocate_device(&ts->client->dev);
 668         if (!ts->input_dev) {
 669                 dev_err(&ts->client->dev, "Failed to allocate input device.");
 670                 return -ENOMEM;
 671         }
 672
 673         ts->input_dev->name = "Goodix Capacitive TouchScreen";
 674         ts->input_dev->phys = "input/ts";
 675         ts->input_dev->id.bustype = BUS_I2C;
 676         ts->input_dev->id.vendor = 0x0416;
 677         ts->input_dev->id.product = ts->id;
 678         ts->input_dev->id.version = ts->version;
 679
 680         /* Capacitive Windows/Home button on some devices */
 681         input_set_capability(ts->input_dev, EV_KEY, KEY_LEFTMETA);
 682
 683         input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_X);
 684         input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_Y);
 685         input_set_abs_params(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
 686         input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
 687
 688         /* Read configuration and apply touchscreen parameters */
 689         goodix_read_config(ts);
 690
 691         /* Try overriding touchscreen parameters via device properties */
 692         touchscreen_parse_properties(ts->input_dev, true, &ts->prop);
 693
 694         if (!ts->prop.max_x || !ts->prop.max_y || !ts->max_touch_num) {
 695                 dev_err(&ts->client->dev, "Invalid config, using defaults\n");
 696                 ts->prop.max_x = GOODIX_MAX_WIDTH - 1;
 697                 ts->prop.max_y = GOODIX_MAX_HEIGHT - 1;
 698                 ts->max_touch_num = GOODIX_MAX_CONTACTS;
 699                 input_abs_set_max(ts->input_dev,
 700                                   ABS_MT_POSITION_X, ts->prop.max_x);
 701                 input_abs_set_max(ts->input_dev,
 702                                   ABS_MT_POSITION_Y, ts->prop.max_y);
 703         }
 704
 705         if (dmi_check_system(rotated_screen)) {
 706                 ts->prop.invert_x = true;
 707                 ts->prop.invert_y = true;
 708                 dev_dbg(&ts->client->dev,
 709                         "Applying '180 degrees rotated screen' quirk\n");
 710         }
 711
 712         error = input_mt_init_slots(ts->input_dev, ts->max_touch_num,
 713                                     INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
 714         if (error) {
 715                 dev_err(&ts->client->dev,
 716                         "Failed to initialize MT slots: %d", error);
 717                 return error;
 718         }
 719
 720         error = input_register_device(ts->input_dev);
 721         if (error) {
 722                 dev_err(&ts->client->dev,
 723                         "Failed to register input device: %d", error);
 724                 return error;
 725         }
 726
 727         ts->irq_flags = goodix_irq_flags[ts->int_trigger_type] | IRQF_ONESHOT;
 728         error = goodix_request_irq(ts);
 729         if (error) {
 730                 dev_err(&ts->client->dev, "request IRQ failed: %d\n", error);
 731                 return error;
 732         }
 733
 734         return 0;
 735 }
 736
 737 /**
 738  * goodix_config_cb - Callback to finish device init
 739  *
 740  * @ts: our goodix_ts_data pointer
 741  *
 742  * request_firmware_wait callback that finishes
 743  * initialization of the device.
 744  */
 745 static void goodix_config_cb(const struct firmware *cfg, void *ctx)
 746 {
 747         struct goodix_ts_data *ts = ctx;
 748         int error;
 749
 750         if (cfg) {
 751                 /* send device configuration to the firmware */
 752                 error = goodix_send_cfg(ts, cfg);
 753                 if (error)
 754                         goto err_release_cfg;
 755         }
 756
 757         goodix_configure_dev(ts);
 758
 759 err_release_cfg:
 760         release_firmware(cfg);
 761         complete_all(&ts->firmware_loading_complete);
 762 }
 763
 764 static int goodix_ts_probe(struct i2c_client *client,
 765                            const struct i2c_device_id *id)
 766 {
 767         struct goodix_ts_data *ts;
 768         int error;
 769
 770         dev_dbg(&client->dev, "I2C Address: 0x%02x\n", client->addr);
 771
 772         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 773                 dev_err(&client->dev, "I2C check functionality failed.\n");
 774                 return -ENXIO;
 775         }
 776
 777         ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
 778         if (!ts)
 779                 return -ENOMEM;
 780
 781         ts->client = client;
 782         i2c_set_clientdata(client, ts);
 783         init_completion(&ts->firmware_loading_complete);
 784
 785         error = goodix_get_gpio_config(ts);
 786         if (error)
 787                 return error;
 788
 789         if (ts->gpiod_int && ts->gpiod_rst) {
 790                 /* reset the controller */
 791                 error = goodix_reset(ts);
 792                 if (error) {
 793                         dev_err(&client->dev, "Controller reset failed.\n");
 794                         return error;
 795                 }
 796         }
 797
 798         error = goodix_i2c_test(client);
 799         if (error) {
 800                 dev_err(&client->dev, "I2C communication failure: %d\n", error);
 801                 return error;
 802         }
 803
 804         error = goodix_read_version(ts);
 805         if (error) {
 806                 dev_err(&client->dev, "Read version failed.\n");
 807                 return error;
 808         }
 809
 810         ts->chip = goodix_get_chip_data(ts->id);
 811
 812         if (ts->gpiod_int && ts->gpiod_rst) {
 813                 /* update device config */
 814                 ts->cfg_name = devm_kasprintf(&client->dev, GFP_KERNEL,
 815                                               "goodix_%d_cfg.bin", ts->id);
 816                 if (!ts->cfg_name)
 817                         return -ENOMEM;
 818
 819                 error = request_firmware_nowait(THIS_MODULE, true, ts->cfg_name,
 820                                                 &client->dev, GFP_KERNEL, ts,
 821                                                 goodix_config_cb);
 822                 if (error) {
 823                         dev_err(&client->dev,
 824                                 "Failed to invoke firmware loader: %d\n",
 825                                 error);
 826                         return error;
 827                 }
 828
 829                 return 0;
 830         } else {
 831                 error = goodix_configure_dev(ts);
 832                 if (error)
 833                         return error;
 834         }
 835
 836         return 0;
 837 }
 838
 839 static int goodix_ts_remove(struct i2c_client *client)
 840 {
 841         struct goodix_ts_data *ts = i2c_get_clientdata(client);
 842
 843         if (ts->gpiod_int && ts->gpiod_rst)
 844                 wait_for_completion(&ts->firmware_loading_complete);
 845
 846         return 0;
 847 }
 848
 849 static int __maybe_unused goodix_suspend(struct device *dev)
 850 {
 851         struct i2c_client *client = to_i2c_client(dev);
 852         struct goodix_ts_data *ts = i2c_get_clientdata(client);
 853         int error;
 854
 855         /* We need gpio pins to suspend/resume */
 856         if (!ts->gpiod_int || !ts->gpiod_rst) {
 857                 disable_irq(client->irq);
 858                 return 0;
 859         }
 860
 861         wait_for_completion(&ts->firmware_loading_complete);
 862
 863         /* Free IRQ as IRQ pin is used as output in the suspend sequence */
 864         goodix_free_irq(ts);
 865
 866         /* Output LOW on the INT pin for 5 ms */
 867         error = gpiod_direction_output(ts->gpiod_int, 0);
 868         if (error) {
 869                 goodix_request_irq(ts);
 870                 return error;
 871         }
 872
 873         usleep_range(5000, 6000);
 874
 875         error = goodix_i2c_write_u8(ts->client, GOODIX_REG_COMMAND,
 876                                     GOODIX_CMD_SCREEN_OFF);
 877         if (error) {
 878                 dev_err(&ts->client->dev, "Screen off command failed\n");
 879                 gpiod_direction_input(ts->gpiod_int);
 880                 goodix_request_irq(ts);
 881                 return -EAGAIN;
 882         }
 883
 884         /*
 885          * The datasheet specifies that the interval between sending screen-off
 886          * command and wake-up should be longer than 58 ms. To avoid waking up
 887          * sooner, delay 58ms here.
 888          */
 889         msleep(58);
 890         return 0;
 891 }
 892
 893 static int __maybe_unused goodix_resume(struct device *dev)
 894 {
 895         struct i2c_client *client = to_i2c_client(dev);
 896         struct goodix_ts_data *ts = i2c_get_clientdata(client);
 897         int error;
 898
 899         if (!ts->gpiod_int || !ts->gpiod_rst) {
 900                 enable_irq(client->irq);
 901                 return 0;
 902         }
 903
 904         /*
 905          * Exit sleep mode by outputting HIGH level to INT pin
 906          * for 2ms~5ms.
 907          */
 908         error = gpiod_direction_output(ts->gpiod_int, 1);
 909         if (error)
 910                 return error;
 911
 912         usleep_range(2000, 5000);
 913
 914         error = goodix_int_sync(ts);
 915         if (error)
 916                 return error;
 917
 918         error = goodix_request_irq(ts);
 919         if (error)
 920                 return error;
 921
 922         return 0;
 923 }
 924
 925 static SIMPLE_DEV_PM_OPS(goodix_pm_ops, goodix_suspend, goodix_resume);
 926
 927 static const struct i2c_device_id goodix_ts_id[] = {
 928         { "GDIX1001:00", 0 },
 929         { }
 930 };
 931 MODULE_DEVICE_TABLE(i2c, goodix_ts_id);
 932
 933 #ifdef CONFIG_ACPI
 934 static const struct acpi_device_id goodix_acpi_match[] = {
 935         { "GDIX1001", 0 },
 936         { }
 937 };
 938 MODULE_DEVICE_TABLE(acpi, goodix_acpi_match);
 939 #endif
 940
 941 #ifdef CONFIG_OF
 942 static const struct of_device_id goodix_of_match[] = {
 943         { .compatible = "goodix,gt1151" },
 944         { .compatible = "goodix,gt911" },
 945         { .compatible = "goodix,gt9110" },
 946         { .compatible = "goodix,gt912" },
 947         { .compatible = "goodix,gt927" },
 948         { .compatible = "goodix,gt9271" },
 949         { .compatible = "goodix,gt928" },
 950         { .compatible = "goodix,gt967" },
 951         { }
 952 };
 953 MODULE_DEVICE_TABLE(of, goodix_of_match);
 954 #endif
 955
 956 static struct i2c_driver goodix_ts_driver = {
 957         .probe = goodix_ts_probe,
 958         .remove = goodix_ts_remove,
 959         .id_table = goodix_ts_id,
 960         .driver = {
 961                 .name = "Goodix-TS",
 962                 .acpi_match_table = ACPI_PTR(goodix_acpi_match),
 963                 .of_match_table = of_match_ptr(goodix_of_match),
 964                 .pm = &goodix_pm_ops,
 965         },
 966 };
 967 module_i2c_driver(goodix_ts_driver);
 968
 969 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
 970 MODULE_AUTHOR("Bastien Nocera <hadess@hadess.net>");
 971 MODULE_DESCRIPTION("Goodix touchscreen driver");
 972 MODULE_LICENSE("GPL v2");