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/regulator/consumer.h>
  31 #include <linux/slab.h>
  32 #include <linux/acpi.h>
  33 #include <linux/of.h>
  34 #include <asm/unaligned.h>
  35
  36 struct goodix_ts_data;
  37
  38 struct goodix_chip_data {
  39         u16 config_addr;
  40         int config_len;
  41         int (*check_config)(struct goodix_ts_data *, const struct firmware *);
  42 };
  43
  44 struct goodix_ts_data {
  45         struct i2c_client *client;
  46         struct input_dev *input_dev;
  47         const struct goodix_chip_data *chip;
  48         struct touchscreen_properties prop;
  49         unsigned int max_touch_num;
  50         unsigned int int_trigger_type;
  51         struct regulator *avdd28;
  52         struct regulator *vddio;
  53         struct gpio_desc *gpiod_int;
  54         struct gpio_desc *gpiod_rst;
  55         u16 id;
  56         u16 version;
  57         const char *cfg_name;
  58         struct completion firmware_loading_complete;
  59         unsigned long irq_flags;
  60 };
  61
  62 #define GOODIX_GPIO_INT_NAME            "irq"
  63 #define GOODIX_GPIO_RST_NAME            "reset"
  64
  65 #define GOODIX_MAX_HEIGHT               4096
  66 #define GOODIX_MAX_WIDTH                4096
  67 #define GOODIX_INT_TRIGGER              1
  68 #define GOODIX_CONTACT_SIZE             8
  69 #define GOODIX_MAX_CONTACTS             10
  70
  71 #define GOODIX_CONFIG_MAX_LENGTH        240
  72 #define GOODIX_CONFIG_911_LENGTH        186
  73 #define GOODIX_CONFIG_967_LENGTH        228
  74
  75 /* Register defines */
  76 #define GOODIX_REG_COMMAND              0x8040
  77 #define GOODIX_CMD_SCREEN_OFF           0x05
  78
  79 #define GOODIX_READ_COOR_ADDR           0x814E
  80 #define GOODIX_GT1X_REG_CONFIG_DATA     0x8050
  81 #define GOODIX_GT9X_REG_CONFIG_DATA     0x8047
  82 #define GOODIX_REG_ID                   0x8140
  83
  84 #define GOODIX_BUFFER_STATUS_READY      BIT(7)
  85 #define GOODIX_BUFFER_STATUS_TIMEOUT    20
  86
  87 #define RESOLUTION_LOC          1
  88 #define MAX_CONTACTS_LOC        5
  89 #define TRIGGER_LOC             6
  90
  91 static int goodix_check_cfg_8(struct goodix_ts_data *ts,
  92                         const struct firmware *cfg);
  93 static int goodix_check_cfg_16(struct goodix_ts_data *ts,
  94                         const struct firmware *cfg);
  95
  96 static const struct goodix_chip_data gt1x_chip_data = {
  97         .config_addr            = GOODIX_GT1X_REG_CONFIG_DATA,
  98         .config_len             = GOODIX_CONFIG_MAX_LENGTH,
  99         .check_config           = goodix_check_cfg_16,
 100 };
 101
 102 static const struct goodix_chip_data gt911_chip_data = {
 103         .config_addr            = GOODIX_GT9X_REG_CONFIG_DATA,
 104         .config_len             = GOODIX_CONFIG_911_LENGTH,
 105         .check_config           = goodix_check_cfg_8,
 106 };
 107
 108 static const struct goodix_chip_data gt967_chip_data = {
 109         .config_addr            = GOODIX_GT9X_REG_CONFIG_DATA,
 110         .config_len             = GOODIX_CONFIG_967_LENGTH,
 111         .check_config           = goodix_check_cfg_8,
 112 };
 113
 114 static const struct goodix_chip_data gt9x_chip_data = {
 115         .config_addr            = GOODIX_GT9X_REG_CONFIG_DATA,
 116         .config_len             = GOODIX_CONFIG_MAX_LENGTH,
 117         .check_config           = goodix_check_cfg_8,
 118 };
 119
 120 static const unsigned long goodix_irq_flags[] = {
 121         IRQ_TYPE_EDGE_RISING,
 122         IRQ_TYPE_EDGE_FALLING,
 123         IRQ_TYPE_LEVEL_LOW,
 124         IRQ_TYPE_LEVEL_HIGH,
 125 };
 126
 127 /*
 128  * Those tablets have their coordinates origin at the bottom right
 129  * of the tablet, as if rotated 180 degrees
 130  */
 131 static const struct dmi_system_id rotated_screen[] = {
 132 #if defined(CONFIG_DMI) && defined(CONFIG_X86)
 133         {
 134                 .ident = "WinBook TW100",
 135                 .matches = {
 136                         DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
 137                         DMI_MATCH(DMI_PRODUCT_NAME, "TW100")
 138                 }
 139         },
 140         {
 141                 .ident = "WinBook TW700",
 142                 .matches = {
 143                         DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
 144                         DMI_MATCH(DMI_PRODUCT_NAME, "TW700")
 145                 },
 146         },
 147 #endif
 148         {}
 149 };
 150
 151 /**
 152  * goodix_i2c_read - read data from a register of the i2c slave device.
 153  *
 154  * @client: i2c device.
 155  * @reg: the register to read from.
 156  * @buf: raw write data buffer.
 157  * @len: length of the buffer to write
 158  */
 159 static int goodix_i2c_read(struct i2c_client *client,
 160                            u16 reg, u8 *buf, int len)
 161 {
 162         struct i2c_msg msgs[2];
 163         __be16 wbuf = cpu_to_be16(reg);
 164         int ret;
 165
 166         msgs[0].flags = 0;
 167         msgs[0].addr  = client->addr;
 168         msgs[0].len   = 2;
 169         msgs[0].buf   = (u8 *)&wbuf;
 170
 171         msgs[1].flags = I2C_M_RD;
 172         msgs[1].addr  = client->addr;
 173         msgs[1].len   = len;
 174         msgs[1].buf   = buf;
 175
 176         ret = i2c_transfer(client->adapter, msgs, 2);
 177         return ret < 0 ? ret : (ret != ARRAY_SIZE(msgs) ? -EIO : 0);
 178 }
 179
 180 /**
 181  * goodix_i2c_write - write data to a register of the i2c slave device.
 182  *
 183  * @client: i2c device.
 184  * @reg: the register to write to.
 185  * @buf: raw data buffer to write.
 186  * @len: length of the buffer to write
 187  */
 188 static int goodix_i2c_write(struct i2c_client *client, u16 reg, const u8 *buf,
 189                             unsigned len)
 190 {
 191         u8 *addr_buf;
 192         struct i2c_msg msg;
 193         int ret;
 194
 195         addr_buf = kmalloc(len + 2, GFP_KERNEL);
 196         if (!addr_buf)
 197                 return -ENOMEM;
 198
 199         addr_buf[0] = reg >> 8;
 200         addr_buf[1] = reg & 0xFF;
 201         memcpy(&addr_buf[2], buf, len);
 202
 203         msg.flags = 0;
 204         msg.addr = client->addr;
 205         msg.buf = addr_buf;
 206         msg.len = len + 2;
 207
 208         ret = i2c_transfer(client->adapter, &msg, 1);
 209         kfree(addr_buf);
 210         return ret < 0 ? ret : (ret != 1 ? -EIO : 0);
 211 }
 212
 213 static int goodix_i2c_write_u8(struct i2c_client *client, u16 reg, u8 value)
 214 {
 215         return goodix_i2c_write(client, reg, &value, sizeof(value));
 216 }
 217
 218 static const struct goodix_chip_data *goodix_get_chip_data(u16 id)
 219 {
 220         switch (id) {
 221         case 1151:
 222         case 5663:
 223         case 5688:
 224                 return &gt1x_chip_data;
 225
 226         case 911:
 227         case 9271:
 228         case 9110:
 229         case 927:
 230         case 928:
 231                 return &gt911_chip_data;
 232
 233         case 912:
 234         case 967:
 235                 return &gt967_chip_data;
 236
 237         default:
 238                 return &gt9x_chip_data;
 239         }
 240 }
 241
 242 static int goodix_ts_read_input_report(struct goodix_ts_data *ts, u8 *data)
 243 {
 244         unsigned long max_timeout;
 245         int touch_num;
 246         int error;
 247
 248         /*
 249          * The 'buffer status' bit, which indicates that the data is valid, is
 250          * not set as soon as the interrupt is raised, but slightly after.
 251          * This takes around 10 ms to happen, so we poll for 20 ms.
 252          */
 253         max_timeout = jiffies + msecs_to_jiffies(GOODIX_BUFFER_STATUS_TIMEOUT);
 254         do {
 255                 error = goodix_i2c_read(ts->client, GOODIX_READ_COOR_ADDR,
 256                                         data, GOODIX_CONTACT_SIZE + 1);
 257                 if (error) {
 258                         dev_err(&ts->client->dev, "I2C transfer error: %d\n",
 259                                         error);
 260                         return error;
 261                 }
 262
 263                 if (data[0] & GOODIX_BUFFER_STATUS_READY) {
 264                         touch_num = data[0] & 0x0f;
 265                         if (touch_num > ts->max_touch_num)
 266                                 return -EPROTO;
 267
 268                         if (touch_num > 1) {
 269                                 data += 1 + GOODIX_CONTACT_SIZE;
 270                                 error = goodix_i2c_read(ts->client,
 271                                                 GOODIX_READ_COOR_ADDR +
 272                                                         1 + GOODIX_CONTACT_SIZE,
 273                                                 data,
 274                                                 GOODIX_CONTACT_SIZE *
 275                                                         (touch_num - 1));
 276                                 if (error)
 277                                         return error;
 278                         }
 279
 280                         return touch_num;
 281                 }
 282
 283                 usleep_range(1000, 2000); /* Poll every 1 - 2 ms */
 284         } while (time_before(jiffies, max_timeout));
 285
 286         /*
 287          * The Goodix panel will send spurious interrupts after a
 288          * 'finger up' event, which will always cause a timeout.
 289          */
 290         return 0;
 291 }
 292
 293 static void goodix_ts_report_touch(struct goodix_ts_data *ts, u8 *coor_data)
 294 {
 295         int id = coor_data[0] & 0x0F;
 296         int input_x = get_unaligned_le16(&coor_data[1]);
 297         int input_y = get_unaligned_le16(&coor_data[3]);
 298         int input_w = get_unaligned_le16(&coor_data[5]);
 299
 300         input_mt_slot(ts->input_dev, id);
 301         input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true);
 302         touchscreen_report_pos(ts->input_dev, &ts->prop,
 303                                input_x, input_y, true);
 304         input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, input_w);
 305         input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w);
 306 }
 307
 308 /**
 309  * goodix_process_events - Process incoming events
 310  *
 311  * @ts: our goodix_ts_data pointer
 312  *
 313  * Called when the IRQ is triggered. Read the current device state, and push
 314  * the input events to the user space.
 315  */
 316 static void goodix_process_events(struct goodix_ts_data *ts)
 317 {
 318         u8  point_data[1 + GOODIX_CONTACT_SIZE * GOODIX_MAX_CONTACTS];
 319         int touch_num;
 320         int i;
 321
 322         touch_num = goodix_ts_read_input_report(ts, point_data);
 323         if (touch_num < 0)
 324                 return;
 325
 326         /*
 327          * Bit 4 of the first byte reports the status of the capacitive
 328          * Windows/Home button.
 329          */
 330         input_report_key(ts->input_dev, KEY_LEFTMETA, point_data[0] & BIT(4));
 331
 332         for (i = 0; i < touch_num; i++)
 333                 goodix_ts_report_touch(ts,
 334                                 &point_data[1 + GOODIX_CONTACT_SIZE * i]);
 335
 336         input_mt_sync_frame(ts->input_dev);
 337         input_sync(ts->input_dev);
 338 }
 339
 340 /**
 341  * goodix_ts_irq_handler - The IRQ handler
 342  *
 343  * @irq: interrupt number.
 344  * @dev_id: private data pointer.
 345  */
 346 static irqreturn_t goodix_ts_irq_handler(int irq, void *dev_id)
 347 {
 348         struct goodix_ts_data *ts = dev_id;
 349
 350         goodix_process_events(ts);
 351
 352         if (goodix_i2c_write_u8(ts->client, GOODIX_READ_COOR_ADDR, 0) < 0)
 353                 dev_err(&ts->client->dev, "I2C write end_cmd error\n");
 354
 355         return IRQ_HANDLED;
 356 }
 357
 358 static void goodix_free_irq(struct goodix_ts_data *ts)
 359 {
 360         devm_free_irq(&ts->client->dev, ts->client->irq, ts);
 361 }
 362
 363 static int goodix_request_irq(struct goodix_ts_data *ts)
 364 {
 365         return devm_request_threaded_irq(&ts->client->dev, ts->client->irq,
 366                                          NULL, goodix_ts_irq_handler,
 367                                          ts->irq_flags, ts->client->name, ts);
 368 }
 369
 370 static int goodix_check_cfg_8(struct goodix_ts_data *ts,
 371                         const struct firmware *cfg)
 372 {
 373         int i, raw_cfg_len = cfg->size - 2;
 374         u8 check_sum = 0;
 375
 376         for (i = 0; i < raw_cfg_len; i++)
 377                 check_sum += cfg->data[i];
 378         check_sum = (~check_sum) + 1;
 379         if (check_sum != cfg->data[raw_cfg_len]) {
 380                 dev_err(&ts->client->dev,
 381                         "The checksum of the config fw is not correct");
 382                 return -EINVAL;
 383         }
 384
 385         if (cfg->data[raw_cfg_len + 1] != 1) {
 386                 dev_err(&ts->client->dev,
 387                         "Config fw must have Config_Fresh register set");
 388                 return -EINVAL;
 389         }
 390
 391         return 0;
 392 }
 393
 394 static int goodix_check_cfg_16(struct goodix_ts_data *ts,
 395                         const struct firmware *cfg)
 396 {
 397         int i, raw_cfg_len = cfg->size - 3;
 398         u16 check_sum = 0;
 399
 400         for (i = 0; i < raw_cfg_len; i += 2)
 401                 check_sum += get_unaligned_be16(&cfg->data[i]);
 402         check_sum = (~check_sum) + 1;
 403         if (check_sum != get_unaligned_be16(&cfg->data[raw_cfg_len])) {
 404                 dev_err(&ts->client->dev,
 405                         "The checksum of the config fw is not correct");
 406                 return -EINVAL;
 407         }
 408
 409         if (cfg->data[raw_cfg_len + 2] != 1) {
 410                 dev_err(&ts->client->dev,
 411                         "Config fw must have Config_Fresh register set");
 412                 return -EINVAL;
 413         }
 414
 415         return 0;
 416 }
 417
 418 /**
 419  * goodix_check_cfg - Checks if config fw is valid
 420  *
 421  * @ts: goodix_ts_data pointer
 422  * @cfg: firmware config data
 423  */
 424 static int goodix_check_cfg(struct goodix_ts_data *ts,
 425                             const struct firmware *cfg)
 426 {
 427         if (cfg->size > GOODIX_CONFIG_MAX_LENGTH) {
 428                 dev_err(&ts->client->dev,
 429                         "The length of the config fw is not correct");
 430                 return -EINVAL;
 431         }
 432
 433         return ts->chip->check_config(ts, cfg);
 434 }
 435
 436 /**
 437  * goodix_send_cfg - Write fw config to device
 438  *
 439  * @ts: goodix_ts_data pointer
 440  * @cfg: config firmware to write to device
 441  */
 442 static int goodix_send_cfg(struct goodix_ts_data *ts,
 443                            const struct firmware *cfg)
 444 {
 445         int error;
 446
 447         error = goodix_check_cfg(ts, cfg);
 448         if (error)
 449                 return error;
 450
 451         error = goodix_i2c_write(ts->client, ts->chip->config_addr, cfg->data,
 452                                  cfg->size);
 453         if (error) {
 454                 dev_err(&ts->client->dev, "Failed to write config data: %d",
 455                         error);
 456                 return error;
 457         }
 458         dev_dbg(&ts->client->dev, "Config sent successfully.");
 459
 460         /* Let the firmware reconfigure itself, so sleep for 10ms */
 461         usleep_range(10000, 11000);
 462
 463         return 0;
 464 }
 465
 466 static int goodix_int_sync(struct goodix_ts_data *ts)
 467 {
 468         int error;
 469
 470         error = gpiod_direction_output(ts->gpiod_int, 0);
 471         if (error)
 472                 return error;
 473
 474         msleep(50);                             /* T5: 50ms */
 475
 476         error = gpiod_direction_input(ts->gpiod_int);
 477         if (error)
 478                 return error;
 479
 480         return 0;
 481 }
 482
 483 /**
 484  * goodix_reset - Reset device during power on
 485  *
 486  * @ts: goodix_ts_data pointer
 487  */
 488 static int goodix_reset(struct goodix_ts_data *ts)
 489 {
 490         int error;
 491
 492         /* begin select I2C slave addr */
 493         error = gpiod_direction_output(ts->gpiod_rst, 0);
 494         if (error)
 495                 return error;
 496
 497         msleep(20);                             /* T2: > 10ms */
 498
 499         /* HIGH: 0x28/0x29, LOW: 0xBA/0xBB */
 500         error = gpiod_direction_output(ts->gpiod_int, ts->client->addr == 0x14);
 501         if (error)
 502                 return error;
 503
 504         usleep_range(100, 2000);                /* T3: > 100us */
 505
 506         error = gpiod_direction_output(ts->gpiod_rst, 1);
 507         if (error)
 508                 return error;
 509
 510         usleep_range(6000, 10000);              /* T4: > 5ms */
 511
 512         /* end select I2C slave addr */
 513         error = gpiod_direction_input(ts->gpiod_rst);
 514         if (error)
 515                 return error;
 516
 517         error = goodix_int_sync(ts);
 518         if (error)
 519                 return error;
 520
 521         return 0;
 522 }
 523
 524 /**
 525  * goodix_get_gpio_config - Get GPIO config from ACPI/DT
 526  *
 527  * @ts: goodix_ts_data pointer
 528  */
 529 static int goodix_get_gpio_config(struct goodix_ts_data *ts)
 530 {
 531         int error;
 532         struct device *dev;
 533         struct gpio_desc *gpiod;
 534
 535         if (!ts->client)
 536                 return -EINVAL;
 537         dev = &ts->client->dev;
 538
 539         ts->avdd28 = devm_regulator_get(dev, "AVDD28");
 540         if (IS_ERR(ts->avdd28)) {
 541                 error = PTR_ERR(ts->avdd28);
 542                 if (error != -EPROBE_DEFER)
 543                         dev_err(dev,
 544                                 "Failed to get AVDD28 regulator: %d\n", error);
 545                 return error;
 546         }
 547
 548         ts->vddio = devm_regulator_get(dev, "VDDIO");
 549         if (IS_ERR(ts->vddio)) {
 550                 error = PTR_ERR(ts->vddio);
 551                 if (error != -EPROBE_DEFER)
 552                         dev_err(dev,
 553                                 "Failed to get VDDIO regulator: %d\n", error);
 554                 return error;
 555         }
 556
 557         /* Get the interrupt GPIO pin number */
 558         gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_INT_NAME, GPIOD_IN);
 559         if (IS_ERR(gpiod)) {
 560                 error = PTR_ERR(gpiod);
 561                 if (error != -EPROBE_DEFER)
 562                         dev_dbg(dev, "Failed to get %s GPIO: %d\n",
 563                                 GOODIX_GPIO_INT_NAME, error);
 564                 return error;
 565         }
 566
 567         ts->gpiod_int = gpiod;
 568
 569         /* Get the reset line GPIO pin number */
 570         gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_RST_NAME, GPIOD_IN);
 571         if (IS_ERR(gpiod)) {
 572                 error = PTR_ERR(gpiod);
 573                 if (error != -EPROBE_DEFER)
 574                         dev_dbg(dev, "Failed to get %s GPIO: %d\n",
 575                                 GOODIX_GPIO_RST_NAME, error);
 576                 return error;
 577         }
 578
 579         ts->gpiod_rst = gpiod;
 580
 581         return 0;
 582 }
 583
 584 /**
 585  * goodix_read_config - Read the embedded configuration of the panel
 586  *
 587  * @ts: our goodix_ts_data pointer
 588  *
 589  * Must be called during probe
 590  */
 591 static void goodix_read_config(struct goodix_ts_data *ts)
 592 {
 593         u8 config[GOODIX_CONFIG_MAX_LENGTH];
 594         int x_max, y_max;
 595         int error;
 596
 597         error = goodix_i2c_read(ts->client, ts->chip->config_addr,
 598                                 config, ts->chip->config_len);
 599         if (error) {
 600                 dev_warn(&ts->client->dev, "Error reading config: %d\n",
 601                          error);
 602                 ts->int_trigger_type = GOODIX_INT_TRIGGER;
 603                 ts->max_touch_num = GOODIX_MAX_CONTACTS;
 604                 return;
 605         }
 606
 607         ts->int_trigger_type = config[TRIGGER_LOC] & 0x03;
 608         ts->max_touch_num = config[MAX_CONTACTS_LOC] & 0x0f;
 609
 610         x_max = get_unaligned_le16(&config[RESOLUTION_LOC]);
 611         y_max = get_unaligned_le16(&config[RESOLUTION_LOC + 2]);
 612         if (x_max && y_max) {
 613                 input_abs_set_max(ts->input_dev, ABS_MT_POSITION_X, x_max - 1);
 614                 input_abs_set_max(ts->input_dev, ABS_MT_POSITION_Y, y_max - 1);
 615         }
 616 }
 617
 618 /**
 619  * goodix_read_version - Read goodix touchscreen version
 620  *
 621  * @ts: our goodix_ts_data pointer
 622  */
 623 static int goodix_read_version(struct goodix_ts_data *ts)
 624 {
 625         int error;
 626         u8 buf[6];
 627         char id_str[5];
 628
 629         error = goodix_i2c_read(ts->client, GOODIX_REG_ID, buf, sizeof(buf));
 630         if (error) {
 631                 dev_err(&ts->client->dev, "read version failed: %d\n", error);
 632                 return error;
 633         }
 634
 635         memcpy(id_str, buf, 4);
 636         id_str[4] = 0;
 637         if (kstrtou16(id_str, 10, &ts->id))
 638                 ts->id = 0x1001;
 639
 640         ts->version = get_unaligned_le16(&buf[4]);
 641
 642         dev_info(&ts->client->dev, "ID %d, version: %04x\n", ts->id,
 643                  ts->version);
 644
 645         return 0;
 646 }
 647
 648 /**
 649  * goodix_i2c_test - I2C test function to check if the device answers.
 650  *
 651  * @client: the i2c client
 652  */
 653 static int goodix_i2c_test(struct i2c_client *client)
 654 {
 655         int retry = 0;
 656         int error;
 657         u8 test;
 658
 659         while (retry++ < 2) {
 660                 error = goodix_i2c_read(client, GOODIX_REG_ID,
 661                                         &test, 1);
 662                 if (!error)
 663                         return 0;
 664
 665                 dev_err(&client->dev, "i2c test failed attempt %d: %d\n",
 666                         retry, error);
 667                 msleep(20);
 668         }
 669
 670         return error;
 671 }
 672
 673 /**
 674  * goodix_configure_dev - Finish device initialization
 675  *
 676  * @ts: our goodix_ts_data pointer
 677  *
 678  * Must be called from probe to finish initialization of the device.
 679  * Contains the common initialization code for both devices that
 680  * declare gpio pins and devices that do not. It is either called
 681  * directly from probe or from request_firmware_wait callback.
 682  */
 683 static int goodix_configure_dev(struct goodix_ts_data *ts)
 684 {
 685         int error;
 686
 687         ts->int_trigger_type = GOODIX_INT_TRIGGER;
 688         ts->max_touch_num = GOODIX_MAX_CONTACTS;
 689
 690         ts->input_dev = devm_input_allocate_device(&ts->client->dev);
 691         if (!ts->input_dev) {
 692                 dev_err(&ts->client->dev, "Failed to allocate input device.");
 693                 return -ENOMEM;
 694         }
 695
 696         ts->input_dev->name = "Goodix Capacitive TouchScreen";
 697         ts->input_dev->phys = "input/ts";
 698         ts->input_dev->id.bustype = BUS_I2C;
 699         ts->input_dev->id.vendor = 0x0416;
 700         ts->input_dev->id.product = ts->id;
 701         ts->input_dev->id.version = ts->version;
 702
 703         /* Capacitive Windows/Home button on some devices */
 704         input_set_capability(ts->input_dev, EV_KEY, KEY_LEFTMETA);
 705
 706         input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_X);
 707         input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_Y);
 708         input_set_abs_params(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
 709         input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
 710
 711         /* Read configuration and apply touchscreen parameters */
 712         goodix_read_config(ts);
 713
 714         /* Try overriding touchscreen parameters via device properties */
 715         touchscreen_parse_properties(ts->input_dev, true, &ts->prop);
 716
 717         if (!ts->prop.max_x || !ts->prop.max_y || !ts->max_touch_num) {
 718                 dev_err(&ts->client->dev,
 719                         "Invalid config (%d, %d, %d), using defaults\n",
 720                         ts->prop.max_x, ts->prop.max_y, ts->max_touch_num);
 721                 ts->prop.max_x = GOODIX_MAX_WIDTH - 1;
 722                 ts->prop.max_y = GOODIX_MAX_HEIGHT - 1;
 723                 ts->max_touch_num = GOODIX_MAX_CONTACTS;
 724                 input_abs_set_max(ts->input_dev,
 725                                   ABS_MT_POSITION_X, ts->prop.max_x);
 726                 input_abs_set_max(ts->input_dev,
 727                                   ABS_MT_POSITION_Y, ts->prop.max_y);
 728         }
 729
 730         if (dmi_check_system(rotated_screen)) {
 731                 ts->prop.invert_x = true;
 732                 ts->prop.invert_y = true;
 733                 dev_dbg(&ts->client->dev,
 734                         "Applying '180 degrees rotated screen' quirk\n");
 735         }
 736
 737         error = input_mt_init_slots(ts->input_dev, ts->max_touch_num,
 738                                     INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
 739         if (error) {
 740                 dev_err(&ts->client->dev,
 741                         "Failed to initialize MT slots: %d", error);
 742                 return error;
 743         }
 744
 745         error = input_register_device(ts->input_dev);
 746         if (error) {
 747                 dev_err(&ts->client->dev,
 748                         "Failed to register input device: %d", error);
 749                 return error;
 750         }
 751
 752         ts->irq_flags = goodix_irq_flags[ts->int_trigger_type] | IRQF_ONESHOT;
 753         error = goodix_request_irq(ts);
 754         if (error) {
 755                 dev_err(&ts->client->dev, "request IRQ failed: %d\n", error);
 756                 return error;
 757         }
 758
 759         return 0;
 760 }
 761
 762 /**
 763  * goodix_config_cb - Callback to finish device init
 764  *
 765  * @ts: our goodix_ts_data pointer
 766  *
 767  * request_firmware_wait callback that finishes
 768  * initialization of the device.
 769  */
 770 static void goodix_config_cb(const struct firmware *cfg, void *ctx)
 771 {
 772         struct goodix_ts_data *ts = ctx;
 773         int error;
 774
 775         if (cfg) {
 776                 /* send device configuration to the firmware */
 777                 error = goodix_send_cfg(ts, cfg);
 778                 if (error)
 779                         goto err_release_cfg;
 780         }
 781
 782         goodix_configure_dev(ts);
 783
 784 err_release_cfg:
 785         release_firmware(cfg);
 786         complete_all(&ts->firmware_loading_complete);
 787 }
 788
 789 static void goodix_disable_regulators(void *arg)
 790 {
 791         struct goodix_ts_data *ts = arg;
 792
 793         regulator_disable(ts->vddio);
 794         regulator_disable(ts->avdd28);
 795 }
 796
 797 static int goodix_ts_probe(struct i2c_client *client,
 798                            const struct i2c_device_id *id)
 799 {
 800         struct goodix_ts_data *ts;
 801         int error;
 802
 803         dev_dbg(&client->dev, "I2C Address: 0x%02x\n", client->addr);
 804
 805         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 806                 dev_err(&client->dev, "I2C check functionality failed.\n");
 807                 return -ENXIO;
 808         }
 809
 810         ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
 811         if (!ts)
 812                 return -ENOMEM;
 813
 814         ts->client = client;
 815         i2c_set_clientdata(client, ts);
 816         init_completion(&ts->firmware_loading_complete);
 817
 818         error = goodix_get_gpio_config(ts);
 819         if (error)
 820                 return error;
 821
 822         /* power up the controller */
 823         error = regulator_enable(ts->avdd28);
 824         if (error) {
 825                 dev_err(&client->dev,
 826                         "Failed to enable AVDD28 regulator: %d\n",
 827                         error);
 828                 return error;
 829         }
 830
 831         error = regulator_enable(ts->vddio);
 832         if (error) {
 833                 dev_err(&client->dev,
 834                         "Failed to enable VDDIO regulator: %d\n",
 835                         error);
 836                 regulator_disable(ts->avdd28);
 837                 return error;
 838         }
 839
 840         error = devm_add_action_or_reset(&client->dev,
 841                                          goodix_disable_regulators, ts);
 842         if (error)
 843                 return error;
 844
 845         if (ts->gpiod_int && ts->gpiod_rst) {
 846                 /* reset the controller */
 847                 error = goodix_reset(ts);
 848                 if (error) {
 849                         dev_err(&client->dev, "Controller reset failed.\n");
 850                         return error;
 851                 }
 852         }
 853
 854         error = goodix_i2c_test(client);
 855         if (error) {
 856                 dev_err(&client->dev, "I2C communication failure: %d\n", error);
 857                 return error;
 858         }
 859
 860         error = goodix_read_version(ts);
 861         if (error) {
 862                 dev_err(&client->dev, "Read version failed.\n");
 863                 return error;
 864         }
 865
 866         ts->chip = goodix_get_chip_data(ts->id);
 867
 868         if (ts->gpiod_int && ts->gpiod_rst) {
 869                 /* update device config */
 870                 ts->cfg_name = devm_kasprintf(&client->dev, GFP_KERNEL,
 871                                               "goodix_%d_cfg.bin", ts->id);
 872                 if (!ts->cfg_name)
 873                         return -ENOMEM;
 874
 875                 error = request_firmware_nowait(THIS_MODULE, true, ts->cfg_name,
 876                                                 &client->dev, GFP_KERNEL, ts,
 877                                                 goodix_config_cb);
 878                 if (error) {
 879                         dev_err(&client->dev,
 880                                 "Failed to invoke firmware loader: %d\n",
 881                                 error);
 882                         return error;
 883                 }
 884
 885                 return 0;
 886         } else {
 887                 error = goodix_configure_dev(ts);
 888                 if (error)
 889                         return error;
 890         }
 891
 892         return 0;
 893 }
 894
 895 static int goodix_ts_remove(struct i2c_client *client)
 896 {
 897         struct goodix_ts_data *ts = i2c_get_clientdata(client);
 898
 899         if (ts->gpiod_int && ts->gpiod_rst)
 900                 wait_for_completion(&ts->firmware_loading_complete);
 901
 902         return 0;
 903 }
 904
 905 static int __maybe_unused goodix_suspend(struct device *dev)
 906 {
 907         struct i2c_client *client = to_i2c_client(dev);
 908         struct goodix_ts_data *ts = i2c_get_clientdata(client);
 909         int error;
 910
 911         /* We need gpio pins to suspend/resume */
 912         if (!ts->gpiod_int || !ts->gpiod_rst) {
 913                 disable_irq(client->irq);
 914                 return 0;
 915         }
 916
 917         wait_for_completion(&ts->firmware_loading_complete);
 918
 919         /* Free IRQ as IRQ pin is used as output in the suspend sequence */
 920         goodix_free_irq(ts);
 921
 922         /* Output LOW on the INT pin for 5 ms */
 923         error = gpiod_direction_output(ts->gpiod_int, 0);
 924         if (error) {
 925                 goodix_request_irq(ts);
 926                 return error;
 927         }
 928
 929         usleep_range(5000, 6000);
 930
 931         error = goodix_i2c_write_u8(ts->client, GOODIX_REG_COMMAND,
 932                                     GOODIX_CMD_SCREEN_OFF);
 933         if (error) {
 934                 dev_err(&ts->client->dev, "Screen off command failed\n");
 935                 gpiod_direction_input(ts->gpiod_int);
 936                 goodix_request_irq(ts);
 937                 return -EAGAIN;
 938         }
 939
 940         /*
 941          * The datasheet specifies that the interval between sending screen-off
 942          * command and wake-up should be longer than 58 ms. To avoid waking up
 943          * sooner, delay 58ms here.
 944          */
 945         msleep(58);
 946         return 0;
 947 }
 948
 949 static int __maybe_unused goodix_resume(struct device *dev)
 950 {
 951         struct i2c_client *client = to_i2c_client(dev);
 952         struct goodix_ts_data *ts = i2c_get_clientdata(client);
 953         int error;
 954
 955         if (!ts->gpiod_int || !ts->gpiod_rst) {
 956                 enable_irq(client->irq);
 957                 return 0;
 958         }
 959
 960         /*
 961          * Exit sleep mode by outputting HIGH level to INT pin
 962          * for 2ms~5ms.
 963          */
 964         error = gpiod_direction_output(ts->gpiod_int, 1);
 965         if (error)
 966                 return error;
 967
 968         usleep_range(2000, 5000);
 969
 970         error = goodix_int_sync(ts);
 971         if (error)
 972                 return error;
 973
 974         error = goodix_request_irq(ts);
 975         if (error)
 976                 return error;
 977
 978         return 0;
 979 }
 980
 981 static SIMPLE_DEV_PM_OPS(goodix_pm_ops, goodix_suspend, goodix_resume);
 982
 983 static const struct i2c_device_id goodix_ts_id[] = {
 984         { "GDIX1001:00", 0 },
 985         { }
 986 };
 987 MODULE_DEVICE_TABLE(i2c, goodix_ts_id);
 988
 989 #ifdef CONFIG_ACPI
 990 static const struct acpi_device_id goodix_acpi_match[] = {
 991         { "GDIX1001", 0 },
 992         { "GDIX1002", 0 },
 993         { }
 994 };
 995 MODULE_DEVICE_TABLE(acpi, goodix_acpi_match);
 996 #endif
 997
 998 #ifdef CONFIG_OF
 999 static const struct of_device_id goodix_of_match[] = {
1000         { .compatible = "goodix,gt1151" },
1001         { .compatible = "goodix,gt5663" },
1002         { .compatible = "goodix,gt5688" },
1003         { .compatible = "goodix,gt911" },
1004         { .compatible = "goodix,gt9110" },
1005         { .compatible = "goodix,gt912" },
1006         { .compatible = "goodix,gt927" },
1007         { .compatible = "goodix,gt9271" },
1008         { .compatible = "goodix,gt928" },
1009         { .compatible = "goodix,gt967" },
1010         { }
1011 };
1012 MODULE_DEVICE_TABLE(of, goodix_of_match);
1013 #endif
1014
1015 static struct i2c_driver goodix_ts_driver = {
1016         .probe = goodix_ts_probe,
1017         .remove = goodix_ts_remove,
1018         .id_table = goodix_ts_id,
1019         .driver = {
1020                 .name = "Goodix-TS",
1021                 .acpi_match_table = ACPI_PTR(goodix_acpi_match),
1022                 .of_match_table = of_match_ptr(goodix_of_match),
1023                 .pm = &goodix_pm_ops,
1024         },
1025 };
1026 module_i2c_driver(goodix_ts_driver);
1027
1028 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
1029 MODULE_AUTHOR("Bastien Nocera <hadess@hadess.net>");
1030 MODULE_DESCRIPTION("Goodix touchscreen driver");
1031 MODULE_LICENSE("GPL v2");