drivers/input/touchscreen/edt-ft5x06.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2012 Simon Budig, <simon.budig@kernelconcepts.de>
   4  * Daniel Wagener <daniel.wagener@kernelconcepts.de> (M09 firmware support)
   5  * Lothar Waßmann <LW@KARO-electronics.de> (DT support)
   6  */
   7
   8 /*
   9  * This is a driver for the EDT "Polytouch" family of touch controllers
  10  * based on the FocalTech FT5x06 line of chips.
  11  *
  12  * Development of this driver has been sponsored by Glyn:
  13  *    http://www.glyn.com/Products/Displays
  14  */
  15
  16 #include <linux/debugfs.h>
  17 #include <linux/delay.h>
  18 #include <linux/gpio/consumer.h>
  19 #include <linux/i2c.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/input.h>
  22 #include <linux/input/mt.h>
  23 #include <linux/input/touchscreen.h>
  24 #include <linux/irq.h>
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/ratelimit.h>
  28 #include <linux/regulator/consumer.h>
  29 #include <linux/slab.h>
  30 #include <linux/uaccess.h>
  31
  32 #include <asm/unaligned.h>
  33
  34 #define WORK_REGISTER_THRESHOLD         0x00
  35 #define WORK_REGISTER_REPORT_RATE       0x08
  36 #define WORK_REGISTER_GAIN              0x30
  37 #define WORK_REGISTER_OFFSET            0x31
  38 #define WORK_REGISTER_NUM_X             0x33
  39 #define WORK_REGISTER_NUM_Y             0x34
  40
  41 #define PMOD_REGISTER_ACTIVE            0x00
  42 #define PMOD_REGISTER_HIBERNATE         0x03
  43
  44 #define M09_REGISTER_THRESHOLD          0x80
  45 #define M09_REGISTER_GAIN               0x92
  46 #define M09_REGISTER_OFFSET             0x93
  47 #define M09_REGISTER_NUM_X              0x94
  48 #define M09_REGISTER_NUM_Y              0x95
  49
  50 #define EV_REGISTER_THRESHOLD           0x40
  51 #define EV_REGISTER_GAIN                0x41
  52 #define EV_REGISTER_OFFSET_Y            0x45
  53 #define EV_REGISTER_OFFSET_X            0x46
  54
  55 #define NO_REGISTER                     0xff
  56
  57 #define WORK_REGISTER_OPMODE            0x3c
  58 #define FACTORY_REGISTER_OPMODE         0x01
  59 #define PMOD_REGISTER_OPMODE            0xa5
  60
  61 #define TOUCH_EVENT_DOWN                0x00
  62 #define TOUCH_EVENT_UP                  0x01
  63 #define TOUCH_EVENT_ON                  0x02
  64 #define TOUCH_EVENT_RESERVED            0x03
  65
  66 #define EDT_NAME_LEN                    23
  67 #define EDT_SWITCH_MODE_RETRIES         10
  68 #define EDT_SWITCH_MODE_DELAY           5 /* msec */
  69 #define EDT_RAW_DATA_RETRIES            100
  70 #define EDT_RAW_DATA_DELAY              1000 /* usec */
  71
  72 #define EDT_DEFAULT_NUM_X               1024
  73 #define EDT_DEFAULT_NUM_Y               1024
  74
  75 enum edt_pmode {
  76         EDT_PMODE_NOT_SUPPORTED,
  77         EDT_PMODE_HIBERNATE,
  78         EDT_PMODE_POWEROFF,
  79 };
  80
  81 enum edt_ver {
  82         EDT_M06,
  83         EDT_M09,
  84         EDT_M12,
  85         EV_FT,
  86         GENERIC_FT,
  87 };
  88
  89 struct edt_reg_addr {
  90         int reg_threshold;
  91         int reg_report_rate;
  92         int reg_gain;
  93         int reg_offset;
  94         int reg_offset_x;
  95         int reg_offset_y;
  96         int reg_num_x;
  97         int reg_num_y;
  98 };
  99
 100 struct edt_ft5x06_ts_data {
 101         struct i2c_client *client;
 102         struct input_dev *input;
 103         struct touchscreen_properties prop;
 104         u16 num_x;
 105         u16 num_y;
 106         struct regulator *vcc;
 107
 108         struct gpio_desc *reset_gpio;
 109         struct gpio_desc *wake_gpio;
 110
 111 #if defined(CONFIG_DEBUG_FS)
 112         struct dentry *debug_dir;
 113         u8 *raw_buffer;
 114         size_t raw_bufsize;
 115 #endif
 116
 117         struct mutex mutex;
 118         bool factory_mode;
 119         enum edt_pmode suspend_mode;
 120         int threshold;
 121         int gain;
 122         int offset;
 123         int offset_x;
 124         int offset_y;
 125         int report_rate;
 126         int max_support_points;
 127
 128         char name[EDT_NAME_LEN];
 129
 130         struct edt_reg_addr reg_addr;
 131         enum edt_ver version;
 132 };
 133
 134 struct edt_i2c_chip_data {
 135         int  max_support_points;
 136 };
 137
 138 static int edt_ft5x06_ts_readwrite(struct i2c_client *client,
 139                                    u16 wr_len, u8 *wr_buf,
 140                                    u16 rd_len, u8 *rd_buf)
 141 {
 142         struct i2c_msg wrmsg[2];
 143         int i = 0;
 144         int ret;
 145
 146         if (wr_len) {
 147                 wrmsg[i].addr  = client->addr;
 148                 wrmsg[i].flags = 0;
 149                 wrmsg[i].len = wr_len;
 150                 wrmsg[i].buf = wr_buf;
 151                 i++;
 152         }
 153         if (rd_len) {
 154                 wrmsg[i].addr  = client->addr;
 155                 wrmsg[i].flags = I2C_M_RD;
 156                 wrmsg[i].len = rd_len;
 157                 wrmsg[i].buf = rd_buf;
 158                 i++;
 159         }
 160
 161         ret = i2c_transfer(client->adapter, wrmsg, i);
 162         if (ret < 0)
 163                 return ret;
 164         if (ret != i)
 165                 return -EIO;
 166
 167         return 0;
 168 }
 169
 170 static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata,
 171                                     u8 *buf, int buflen)
 172 {
 173         int i;
 174         u8 crc = 0;
 175
 176         for (i = 0; i < buflen - 1; i++)
 177                 crc ^= buf[i];
 178
 179         if (crc != buf[buflen-1]) {
 180                 dev_err_ratelimited(&tsdata->client->dev,
 181                                     "crc error: 0x%02x expected, got 0x%02x\n",
 182                                     crc, buf[buflen-1]);
 183                 return false;
 184         }
 185
 186         return true;
 187 }
 188
 189 static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
 190 {
 191         struct edt_ft5x06_ts_data *tsdata = dev_id;
 192         struct device *dev = &tsdata->client->dev;
 193         u8 cmd;
 194         u8 rdbuf[63];
 195         int i, type, x, y, id;
 196         int offset, tplen, datalen, crclen;
 197         int error;
 198
 199         switch (tsdata->version) {
 200         case EDT_M06:
 201                 cmd = 0xf9; /* tell the controller to send touch data */
 202                 offset = 5; /* where the actual touch data starts */
 203                 tplen = 4;  /* data comes in so called frames */
 204                 crclen = 1; /* length of the crc data */
 205                 break;
 206
 207         case EDT_M09:
 208         case EDT_M12:
 209         case EV_FT:
 210         case GENERIC_FT:
 211                 cmd = 0x0;
 212                 offset = 3;
 213                 tplen = 6;
 214                 crclen = 0;
 215                 break;
 216
 217         default:
 218                 goto out;
 219         }
 220
 221         memset(rdbuf, 0, sizeof(rdbuf));
 222         datalen = tplen * tsdata->max_support_points + offset + crclen;
 223
 224         error = edt_ft5x06_ts_readwrite(tsdata->client,
 225                                         sizeof(cmd), &cmd,
 226                                         datalen, rdbuf);
 227         if (error) {
 228                 dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
 229                                     error);
 230                 goto out;
 231         }
 232
 233         /* M09/M12 does not send header or CRC */
 234         if (tsdata->version == EDT_M06) {
 235                 if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa ||
 236                         rdbuf[2] != datalen) {
 237                         dev_err_ratelimited(dev,
 238                                         "Unexpected header: %02x%02x%02x!\n",
 239                                         rdbuf[0], rdbuf[1], rdbuf[2]);
 240                         goto out;
 241                 }
 242
 243                 if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, datalen))
 244                         goto out;
 245         }
 246
 247         for (i = 0; i < tsdata->max_support_points; i++) {
 248                 u8 *buf = &rdbuf[i * tplen + offset];
 249
 250                 type = buf[0] >> 6;
 251                 /* ignore Reserved events */
 252                 if (type == TOUCH_EVENT_RESERVED)
 253                         continue;
 254
 255                 /* M06 sometimes sends bogus coordinates in TOUCH_DOWN */
 256                 if (tsdata->version == EDT_M06 && type == TOUCH_EVENT_DOWN)
 257                         continue;
 258
 259                 x = get_unaligned_be16(buf) & 0x0fff;
 260                 y = get_unaligned_be16(buf + 2) & 0x0fff;
 261                 /* The FT5x26 send the y coordinate first */
 262                 if (tsdata->version == EV_FT)
 263                         swap(x, y);
 264
 265                 id = (buf[2] >> 4) & 0x0f;
 266
 267                 input_mt_slot(tsdata->input, id);
 268                 if (input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER,
 269                                                type != TOUCH_EVENT_UP))
 270                         touchscreen_report_pos(tsdata->input, &tsdata->prop,
 271                                                x, y, true);
 272         }
 273
 274         input_mt_report_pointer_emulation(tsdata->input, true);
 275         input_sync(tsdata->input);
 276
 277 out:
 278         return IRQ_HANDLED;
 279 }
 280
 281 static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
 282                                      u8 addr, u8 value)
 283 {
 284         u8 wrbuf[4];
 285
 286         switch (tsdata->version) {
 287         case EDT_M06:
 288                 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
 289                 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
 290                 wrbuf[2] = value;
 291                 wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2];
 292                 return edt_ft5x06_ts_readwrite(tsdata->client, 4,
 293                                         wrbuf, 0, NULL);
 294
 295         case EDT_M09:
 296         case EDT_M12:
 297         case EV_FT:
 298         case GENERIC_FT:
 299                 wrbuf[0] = addr;
 300                 wrbuf[1] = value;
 301
 302                 return edt_ft5x06_ts_readwrite(tsdata->client, 2,
 303                                         wrbuf, 0, NULL);
 304
 305         default:
 306                 return -EINVAL;
 307         }
 308 }
 309
 310 static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
 311                                     u8 addr)
 312 {
 313         u8 wrbuf[2], rdbuf[2];
 314         int error;
 315
 316         switch (tsdata->version) {
 317         case EDT_M06:
 318                 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
 319                 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
 320                 wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
 321
 322                 error = edt_ft5x06_ts_readwrite(tsdata->client, 2, wrbuf, 2,
 323                                                 rdbuf);
 324                 if (error)
 325                         return error;
 326
 327                 if ((wrbuf[0] ^ wrbuf[1] ^ rdbuf[0]) != rdbuf[1]) {
 328                         dev_err(&tsdata->client->dev,
 329                                 "crc error: 0x%02x expected, got 0x%02x\n",
 330                                 wrbuf[0] ^ wrbuf[1] ^ rdbuf[0],
 331                                 rdbuf[1]);
 332                         return -EIO;
 333                 }
 334                 break;
 335
 336         case EDT_M09:
 337         case EDT_M12:
 338         case EV_FT:
 339         case GENERIC_FT:
 340                 wrbuf[0] = addr;
 341                 error = edt_ft5x06_ts_readwrite(tsdata->client, 1,
 342                                                 wrbuf, 1, rdbuf);
 343                 if (error)
 344                         return error;
 345                 break;
 346
 347         default:
 348                 return -EINVAL;
 349         }
 350
 351         return rdbuf[0];
 352 }
 353
 354 struct edt_ft5x06_attribute {
 355         struct device_attribute dattr;
 356         size_t field_offset;
 357         u8 limit_low;
 358         u8 limit_high;
 359         u8 addr_m06;
 360         u8 addr_m09;
 361         u8 addr_ev;
 362 };
 363
 364 #define EDT_ATTR(_field, _mode, _addr_m06, _addr_m09, _addr_ev,         \
 365                 _limit_low, _limit_high)                                \
 366         struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = {        \
 367                 .dattr = __ATTR(_field, _mode,                          \
 368                                 edt_ft5x06_setting_show,                \
 369                                 edt_ft5x06_setting_store),              \
 370                 .field_offset = offsetof(struct edt_ft5x06_ts_data, _field), \
 371                 .addr_m06 = _addr_m06,                                  \
 372                 .addr_m09 = _addr_m09,                                  \
 373                 .addr_ev  = _addr_ev,                                   \
 374                 .limit_low = _limit_low,                                \
 375                 .limit_high = _limit_high,                              \
 376         }
 377
 378 static ssize_t edt_ft5x06_setting_show(struct device *dev,
 379                                        struct device_attribute *dattr,
 380                                        char *buf)
 381 {
 382         struct i2c_client *client = to_i2c_client(dev);
 383         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
 384         struct edt_ft5x06_attribute *attr =
 385                         container_of(dattr, struct edt_ft5x06_attribute, dattr);
 386         u8 *field = (u8 *)tsdata + attr->field_offset;
 387         int val;
 388         size_t count = 0;
 389         int error = 0;
 390         u8 addr;
 391
 392         mutex_lock(&tsdata->mutex);
 393
 394         if (tsdata->factory_mode) {
 395                 error = -EIO;
 396                 goto out;
 397         }
 398
 399         switch (tsdata->version) {
 400         case EDT_M06:
 401                 addr = attr->addr_m06;
 402                 break;
 403
 404         case EDT_M09:
 405         case EDT_M12:
 406         case GENERIC_FT:
 407                 addr = attr->addr_m09;
 408                 break;
 409
 410         case EV_FT:
 411                 addr = attr->addr_ev;
 412                 break;
 413
 414         default:
 415                 error = -ENODEV;
 416                 goto out;
 417         }
 418
 419         if (addr != NO_REGISTER) {
 420                 val = edt_ft5x06_register_read(tsdata, addr);
 421                 if (val < 0) {
 422                         error = val;
 423                         dev_err(&tsdata->client->dev,
 424                                 "Failed to fetch attribute %s, error %d\n",
 425                                 dattr->attr.name, error);
 426                         goto out;
 427                 }
 428         } else {
 429                 val = *field;
 430         }
 431
 432         if (val != *field) {
 433                 dev_warn(&tsdata->client->dev,
 434                          "%s: read (%d) and stored value (%d) differ\n",
 435                          dattr->attr.name, val, *field);
 436                 *field = val;
 437         }
 438
 439         count = scnprintf(buf, PAGE_SIZE, "%d\n", val);
 440 out:
 441         mutex_unlock(&tsdata->mutex);
 442         return error ?: count;
 443 }
 444
 445 static ssize_t edt_ft5x06_setting_store(struct device *dev,
 446                                         struct device_attribute *dattr,
 447                                         const char *buf, size_t count)
 448 {
 449         struct i2c_client *client = to_i2c_client(dev);
 450         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
 451         struct edt_ft5x06_attribute *attr =
 452                         container_of(dattr, struct edt_ft5x06_attribute, dattr);
 453         u8 *field = (u8 *)tsdata + attr->field_offset;
 454         unsigned int val;
 455         int error;
 456         u8 addr;
 457
 458         mutex_lock(&tsdata->mutex);
 459
 460         if (tsdata->factory_mode) {
 461                 error = -EIO;
 462                 goto out;
 463         }
 464
 465         error = kstrtouint(buf, 0, &val);
 466         if (error)
 467                 goto out;
 468
 469         if (val < attr->limit_low || val > attr->limit_high) {
 470                 error = -ERANGE;
 471                 goto out;
 472         }
 473
 474         switch (tsdata->version) {
 475         case EDT_M06:
 476                 addr = attr->addr_m06;
 477                 break;
 478
 479         case EDT_M09:
 480         case EDT_M12:
 481         case GENERIC_FT:
 482                 addr = attr->addr_m09;
 483                 break;
 484
 485         case EV_FT:
 486                 addr = attr->addr_ev;
 487                 break;
 488
 489         default:
 490                 error = -ENODEV;
 491                 goto out;
 492         }
 493
 494         if (addr != NO_REGISTER) {
 495                 error = edt_ft5x06_register_write(tsdata, addr, val);
 496                 if (error) {
 497                         dev_err(&tsdata->client->dev,
 498                                 "Failed to update attribute %s, error: %d\n",
 499                                 dattr->attr.name, error);
 500                         goto out;
 501                 }
 502         }
 503         *field = val;
 504
 505 out:
 506         mutex_unlock(&tsdata->mutex);
 507         return error ?: count;
 508 }
 509
 510 /* m06, m09: range 0-31, m12: range 0-5 */
 511 static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN,
 512                 M09_REGISTER_GAIN, EV_REGISTER_GAIN, 0, 31);
 513 /* m06, m09: range 0-31, m12: range 0-16 */
 514 static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET,
 515                 M09_REGISTER_OFFSET, NO_REGISTER, 0, 31);
 516 /* m06, m09, m12: no supported, ev_ft: range 0-80 */
 517 static EDT_ATTR(offset_x, S_IWUSR | S_IRUGO, NO_REGISTER, NO_REGISTER,
 518                 EV_REGISTER_OFFSET_X, 0, 80);
 519 /* m06, m09, m12: no supported, ev_ft: range 0-80 */
 520 static EDT_ATTR(offset_y, S_IWUSR | S_IRUGO, NO_REGISTER, NO_REGISTER,
 521                 EV_REGISTER_OFFSET_Y, 0, 80);
 522 /* m06: range 20 to 80, m09: range 0 to 30, m12: range 1 to 255... */
 523 static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD,
 524                 M09_REGISTER_THRESHOLD, EV_REGISTER_THRESHOLD, 0, 255);
 525 /* m06: range 3 to 14, m12: (0x64: 100Hz) */
 526 static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE,
 527                 NO_REGISTER, NO_REGISTER, 0, 255);
 528
 529 static struct attribute *edt_ft5x06_attrs[] = {
 530         &edt_ft5x06_attr_gain.dattr.attr,
 531         &edt_ft5x06_attr_offset.dattr.attr,
 532         &edt_ft5x06_attr_offset_x.dattr.attr,
 533         &edt_ft5x06_attr_offset_y.dattr.attr,
 534         &edt_ft5x06_attr_threshold.dattr.attr,
 535         &edt_ft5x06_attr_report_rate.dattr.attr,
 536         NULL
 537 };
 538
 539 static const struct attribute_group edt_ft5x06_attr_group = {
 540         .attrs = edt_ft5x06_attrs,
 541 };
 542
 543 static void edt_ft5x06_restore_reg_parameters(struct edt_ft5x06_ts_data *tsdata)
 544 {
 545         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 546
 547         edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold,
 548                                   tsdata->threshold);
 549         edt_ft5x06_register_write(tsdata, reg_addr->reg_gain,
 550                                   tsdata->gain);
 551         if (reg_addr->reg_offset != NO_REGISTER)
 552                 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset,
 553                                           tsdata->offset);
 554         if (reg_addr->reg_offset_x != NO_REGISTER)
 555                 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_x,
 556                                           tsdata->offset_x);
 557         if (reg_addr->reg_offset_y != NO_REGISTER)
 558                 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_y,
 559                                           tsdata->offset_y);
 560         if (reg_addr->reg_report_rate != NO_REGISTER)
 561                 edt_ft5x06_register_write(tsdata, reg_addr->reg_report_rate,
 562                                   tsdata->report_rate);
 563
 564 }
 565
 566 #ifdef CONFIG_DEBUG_FS
 567 static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
 568 {
 569         struct i2c_client *client = tsdata->client;
 570         int retries = EDT_SWITCH_MODE_RETRIES;
 571         int ret;
 572         int error;
 573
 574         if (tsdata->version != EDT_M06) {
 575                 dev_err(&client->dev,
 576                         "No factory mode support for non-M06 devices\n");
 577                 return -EINVAL;
 578         }
 579
 580         disable_irq(client->irq);
 581
 582         if (!tsdata->raw_buffer) {
 583                 tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y *
 584                                       sizeof(u16);
 585                 tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
 586                 if (!tsdata->raw_buffer) {
 587                         error = -ENOMEM;
 588                         goto err_out;
 589                 }
 590         }
 591
 592         /* mode register is 0x3c when in the work mode */
 593         error = edt_ft5x06_register_write(tsdata, WORK_REGISTER_OPMODE, 0x03);
 594         if (error) {
 595                 dev_err(&client->dev,
 596                         "failed to switch to factory mode, error %d\n", error);
 597                 goto err_out;
 598         }
 599
 600         tsdata->factory_mode = true;
 601         do {
 602                 mdelay(EDT_SWITCH_MODE_DELAY);
 603                 /* mode register is 0x01 when in factory mode */
 604                 ret = edt_ft5x06_register_read(tsdata, FACTORY_REGISTER_OPMODE);
 605                 if (ret == 0x03)
 606                         break;
 607         } while (--retries > 0);
 608
 609         if (retries == 0) {
 610                 dev_err(&client->dev, "not in factory mode after %dms.\n",
 611                         EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
 612                 error = -EIO;
 613                 goto err_out;
 614         }
 615
 616         return 0;
 617
 618 err_out:
 619         kfree(tsdata->raw_buffer);
 620         tsdata->raw_buffer = NULL;
 621         tsdata->factory_mode = false;
 622         enable_irq(client->irq);
 623
 624         return error;
 625 }
 626
 627 static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
 628 {
 629         struct i2c_client *client = tsdata->client;
 630         int retries = EDT_SWITCH_MODE_RETRIES;
 631         int ret;
 632         int error;
 633
 634         /* mode register is 0x01 when in the factory mode */
 635         error = edt_ft5x06_register_write(tsdata, FACTORY_REGISTER_OPMODE, 0x1);
 636         if (error) {
 637                 dev_err(&client->dev,
 638                         "failed to switch to work mode, error: %d\n", error);
 639                 return error;
 640         }
 641
 642         tsdata->factory_mode = false;
 643
 644         do {
 645                 mdelay(EDT_SWITCH_MODE_DELAY);
 646                 /* mode register is 0x01 when in factory mode */
 647                 ret = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OPMODE);
 648                 if (ret == 0x01)
 649                         break;
 650         } while (--retries > 0);
 651
 652         if (retries == 0) {
 653                 dev_err(&client->dev, "not in work mode after %dms.\n",
 654                         EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
 655                 tsdata->factory_mode = true;
 656                 return -EIO;
 657         }
 658
 659         kfree(tsdata->raw_buffer);
 660         tsdata->raw_buffer = NULL;
 661
 662         edt_ft5x06_restore_reg_parameters(tsdata);
 663         enable_irq(client->irq);
 664
 665         return 0;
 666 }
 667
 668 static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
 669 {
 670         struct edt_ft5x06_ts_data *tsdata = data;
 671
 672         *mode = tsdata->factory_mode;
 673
 674         return 0;
 675 };
 676
 677 static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode)
 678 {
 679         struct edt_ft5x06_ts_data *tsdata = data;
 680         int retval = 0;
 681
 682         if (mode > 1)
 683                 return -ERANGE;
 684
 685         mutex_lock(&tsdata->mutex);
 686
 687         if (mode != tsdata->factory_mode) {
 688                 retval = mode ? edt_ft5x06_factory_mode(tsdata) :
 689                                 edt_ft5x06_work_mode(tsdata);
 690         }
 691
 692         mutex_unlock(&tsdata->mutex);
 693
 694         return retval;
 695 };
 696
 697 DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get,
 698                         edt_ft5x06_debugfs_mode_set, "%llu\n");
 699
 700 static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
 701                                 char __user *buf, size_t count, loff_t *off)
 702 {
 703         struct edt_ft5x06_ts_data *tsdata = file->private_data;
 704         struct i2c_client *client = tsdata->client;
 705         int retries  = EDT_RAW_DATA_RETRIES;
 706         int val, i, error;
 707         size_t read = 0;
 708         int colbytes;
 709         char wrbuf[3];
 710         u8 *rdbuf;
 711
 712         if (*off < 0 || *off >= tsdata->raw_bufsize)
 713                 return 0;
 714
 715         mutex_lock(&tsdata->mutex);
 716
 717         if (!tsdata->factory_mode || !tsdata->raw_buffer) {
 718                 error = -EIO;
 719                 goto out;
 720         }
 721
 722         error = edt_ft5x06_register_write(tsdata, 0x08, 0x01);
 723         if (error) {
 724                 dev_dbg(&client->dev,
 725                         "failed to write 0x08 register, error %d\n", error);
 726                 goto out;
 727         }
 728
 729         do {
 730                 usleep_range(EDT_RAW_DATA_DELAY, EDT_RAW_DATA_DELAY + 100);
 731                 val = edt_ft5x06_register_read(tsdata, 0x08);
 732                 if (val < 1)
 733                         break;
 734         } while (--retries > 0);
 735
 736         if (val < 0) {
 737                 error = val;
 738                 dev_dbg(&client->dev,
 739                         "failed to read 0x08 register, error %d\n", error);
 740                 goto out;
 741         }
 742
 743         if (retries == 0) {
 744                 dev_dbg(&client->dev,
 745                         "timed out waiting for register to settle\n");
 746                 error = -ETIMEDOUT;
 747                 goto out;
 748         }
 749
 750         rdbuf = tsdata->raw_buffer;
 751         colbytes = tsdata->num_y * sizeof(u16);
 752
 753         wrbuf[0] = 0xf5;
 754         wrbuf[1] = 0x0e;
 755         for (i = 0; i < tsdata->num_x; i++) {
 756                 wrbuf[2] = i;  /* column index */
 757                 error = edt_ft5x06_ts_readwrite(tsdata->client,
 758                                                 sizeof(wrbuf), wrbuf,
 759                                                 colbytes, rdbuf);
 760                 if (error)
 761                         goto out;
 762
 763                 rdbuf += colbytes;
 764         }
 765
 766         read = min_t(size_t, count, tsdata->raw_bufsize - *off);
 767         if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) {
 768                 error = -EFAULT;
 769                 goto out;
 770         }
 771
 772         *off += read;
 773 out:
 774         mutex_unlock(&tsdata->mutex);
 775         return error ?: read;
 776 };
 777
 778 static const struct file_operations debugfs_raw_data_fops = {
 779         .open = simple_open,
 780         .read = edt_ft5x06_debugfs_raw_data_read,
 781 };
 782
 783 static void edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
 784                                           const char *debugfs_name)
 785 {
 786         tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
 787
 788         debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x);
 789         debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y);
 790
 791         debugfs_create_file("mode", S_IRUSR | S_IWUSR,
 792                             tsdata->debug_dir, tsdata, &debugfs_mode_fops);
 793         debugfs_create_file("raw_data", S_IRUSR,
 794                             tsdata->debug_dir, tsdata, &debugfs_raw_data_fops);
 795 }
 796
 797 static void edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
 798 {
 799         debugfs_remove_recursive(tsdata->debug_dir);
 800         kfree(tsdata->raw_buffer);
 801 }
 802
 803 #else
 804
 805 static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
 806 {
 807         return -ENOSYS;
 808 }
 809
 810 static void edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
 811                                           const char *debugfs_name)
 812 {
 813 }
 814
 815 static void edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
 816 {
 817 }
 818
 819 #endif /* CONFIG_DEBUGFS */
 820
 821 static int edt_ft5x06_ts_identify(struct i2c_client *client,
 822                                         struct edt_ft5x06_ts_data *tsdata,
 823                                         char *fw_version)
 824 {
 825         u8 rdbuf[EDT_NAME_LEN];
 826         char *p;
 827         int error;
 828         char *model_name = tsdata->name;
 829
 830         /* see what we find if we assume it is a M06 *
 831          * if we get less than EDT_NAME_LEN, we don't want
 832          * to have garbage in there
 833          */
 834         memset(rdbuf, 0, sizeof(rdbuf));
 835         error = edt_ft5x06_ts_readwrite(client, 1, "\xBB",
 836                                         EDT_NAME_LEN - 1, rdbuf);
 837         if (error)
 838                 return error;
 839
 840         /* Probe content for something consistent.
 841          * M06 starts with a response byte, M12 gives the data directly.
 842          * M09/Generic does not provide model number information.
 843          */
 844         if (!strncasecmp(rdbuf + 1, "EP0", 3)) {
 845                 tsdata->version = EDT_M06;
 846
 847                 /* remove last '$' end marker */
 848                 rdbuf[EDT_NAME_LEN - 1] = '\0';
 849                 if (rdbuf[EDT_NAME_LEN - 2] == '$')
 850                         rdbuf[EDT_NAME_LEN - 2] = '\0';
 851
 852                 /* look for Model/Version separator */
 853                 p = strchr(rdbuf, '*');
 854                 if (p)
 855                         *p++ = '\0';
 856                 strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
 857                 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
 858         } else if (!strncasecmp(rdbuf, "EP0", 3)) {
 859                 tsdata->version = EDT_M12;
 860
 861                 /* remove last '$' end marker */
 862                 rdbuf[EDT_NAME_LEN - 2] = '\0';
 863                 if (rdbuf[EDT_NAME_LEN - 3] == '$')
 864                         rdbuf[EDT_NAME_LEN - 3] = '\0';
 865
 866                 /* look for Model/Version separator */
 867                 p = strchr(rdbuf, '*');
 868                 if (p)
 869                         *p++ = '\0';
 870                 strlcpy(model_name, rdbuf, EDT_NAME_LEN);
 871                 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
 872         } else {
 873                 /* If it is not an EDT M06/M12 touchscreen, then the model
 874                  * detection is a bit hairy. The different ft5x06
 875                  * firmares around don't reliably implement the
 876                  * identification registers. Well, we'll take a shot.
 877                  *
 878                  * The main difference between generic focaltec based
 879                  * touches and EDT M09 is that we know how to retrieve
 880                  * the max coordinates for the latter.
 881                  */
 882                 tsdata->version = GENERIC_FT;
 883
 884                 error = edt_ft5x06_ts_readwrite(client, 1, "\xA6",
 885                                                 2, rdbuf);
 886                 if (error)
 887                         return error;
 888
 889                 strlcpy(fw_version, rdbuf, 2);
 890
 891                 error = edt_ft5x06_ts_readwrite(client, 1, "\xA8",
 892                                                 1, rdbuf);
 893                 if (error)
 894                         return error;
 895
 896                 /* This "model identification" is not exact. Unfortunately
 897                  * not all firmwares for the ft5x06 put useful values in
 898                  * the identification registers.
 899                  */
 900                 switch (rdbuf[0]) {
 901                 case 0x35:   /* EDT EP0350M09 */
 902                 case 0x43:   /* EDT EP0430M09 */
 903                 case 0x50:   /* EDT EP0500M09 */
 904                 case 0x57:   /* EDT EP0570M09 */
 905                 case 0x70:   /* EDT EP0700M09 */
 906                         tsdata->version = EDT_M09;
 907                         snprintf(model_name, EDT_NAME_LEN, "EP0%i%i0M09",
 908                                 rdbuf[0] >> 4, rdbuf[0] & 0x0F);
 909                         break;
 910                 case 0xa1:   /* EDT EP1010ML00 */
 911                         tsdata->version = EDT_M09;
 912                         snprintf(model_name, EDT_NAME_LEN, "EP%i%i0ML00",
 913                                 rdbuf[0] >> 4, rdbuf[0] & 0x0F);
 914                         break;
 915                 case 0x5a:   /* Solomon Goldentek Display */
 916                         snprintf(model_name, EDT_NAME_LEN, "GKTW50SCED1R0");
 917                         break;
 918                 case 0x59:  /* Evervision Display with FT5xx6 TS */
 919                         tsdata->version = EV_FT;
 920                         error = edt_ft5x06_ts_readwrite(client, 1, "\x53",
 921                                                         1, rdbuf);
 922                         if (error)
 923                                 return error;
 924                         strlcpy(fw_version, rdbuf, 1);
 925                         snprintf(model_name, EDT_NAME_LEN,
 926                                  "EVERVISION-FT5726NEi");
 927                         break;
 928                 default:
 929                         snprintf(model_name, EDT_NAME_LEN,
 930                                  "generic ft5x06 (%02x)",
 931                                  rdbuf[0]);
 932                         break;
 933                 }
 934         }
 935
 936         return 0;
 937 }
 938
 939 static void edt_ft5x06_ts_get_defaults(struct device *dev,
 940                                        struct edt_ft5x06_ts_data *tsdata)
 941 {
 942         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 943         u32 val;
 944         int error;
 945
 946         error = device_property_read_u32(dev, "threshold", &val);
 947         if (!error) {
 948                 edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold, val);
 949                 tsdata->threshold = val;
 950         }
 951
 952         error = device_property_read_u32(dev, "gain", &val);
 953         if (!error) {
 954                 edt_ft5x06_register_write(tsdata, reg_addr->reg_gain, val);
 955                 tsdata->gain = val;
 956         }
 957
 958         error = device_property_read_u32(dev, "offset", &val);
 959         if (!error) {
 960                 if (reg_addr->reg_offset != NO_REGISTER)
 961                         edt_ft5x06_register_write(tsdata,
 962                                                   reg_addr->reg_offset, val);
 963                 tsdata->offset = val;
 964         }
 965
 966         error = device_property_read_u32(dev, "offset-x", &val);
 967         if (!error) {
 968                 if (reg_addr->reg_offset_x != NO_REGISTER)
 969                         edt_ft5x06_register_write(tsdata,
 970                                                   reg_addr->reg_offset_x, val);
 971                 tsdata->offset_x = val;
 972         }
 973
 974         error = device_property_read_u32(dev, "offset-y", &val);
 975         if (!error) {
 976                 if (reg_addr->reg_offset_y != NO_REGISTER)
 977                         edt_ft5x06_register_write(tsdata,
 978                                                   reg_addr->reg_offset_y, val);
 979                 tsdata->offset_y = val;
 980         }
 981 }
 982
 983 static void edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
 984 {
 985         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 986
 987         tsdata->threshold = edt_ft5x06_register_read(tsdata,
 988                                                      reg_addr->reg_threshold);
 989         tsdata->gain = edt_ft5x06_register_read(tsdata, reg_addr->reg_gain);
 990         if (reg_addr->reg_offset != NO_REGISTER)
 991                 tsdata->offset =
 992                         edt_ft5x06_register_read(tsdata, reg_addr->reg_offset);
 993         if (reg_addr->reg_offset_x != NO_REGISTER)
 994                 tsdata->offset_x = edt_ft5x06_register_read(tsdata,
 995                                                 reg_addr->reg_offset_x);
 996         if (reg_addr->reg_offset_y != NO_REGISTER)
 997                 tsdata->offset_y = edt_ft5x06_register_read(tsdata,
 998                                                 reg_addr->reg_offset_y);
 999         if (reg_addr->reg_report_rate != NO_REGISTER)
1000                 tsdata->report_rate = edt_ft5x06_register_read(tsdata,
1001                                                 reg_addr->reg_report_rate);
1002         tsdata->num_x = EDT_DEFAULT_NUM_X;
1003         if (reg_addr->reg_num_x != NO_REGISTER)
1004                 tsdata->num_x = edt_ft5x06_register_read(tsdata,
1005                                                          reg_addr->reg_num_x);
1006         tsdata->num_y = EDT_DEFAULT_NUM_Y;
1007         if (reg_addr->reg_num_y != NO_REGISTER)
1008                 tsdata->num_y = edt_ft5x06_register_read(tsdata,
1009                                                          reg_addr->reg_num_y);
1010 }
1011
1012 static void edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
1013 {
1014         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
1015
1016         switch (tsdata->version) {
1017         case EDT_M06:
1018                 reg_addr->reg_threshold = WORK_REGISTER_THRESHOLD;
1019                 reg_addr->reg_report_rate = WORK_REGISTER_REPORT_RATE;
1020                 reg_addr->reg_gain = WORK_REGISTER_GAIN;
1021                 reg_addr->reg_offset = WORK_REGISTER_OFFSET;
1022                 reg_addr->reg_offset_x = NO_REGISTER;
1023                 reg_addr->reg_offset_y = NO_REGISTER;
1024                 reg_addr->reg_num_x = WORK_REGISTER_NUM_X;
1025                 reg_addr->reg_num_y = WORK_REGISTER_NUM_Y;
1026                 break;
1027
1028         case EDT_M09:
1029         case EDT_M12:
1030                 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
1031                 reg_addr->reg_report_rate = NO_REGISTER;
1032                 reg_addr->reg_gain = M09_REGISTER_GAIN;
1033                 reg_addr->reg_offset = M09_REGISTER_OFFSET;
1034                 reg_addr->reg_offset_x = NO_REGISTER;
1035                 reg_addr->reg_offset_y = NO_REGISTER;
1036                 reg_addr->reg_num_x = M09_REGISTER_NUM_X;
1037                 reg_addr->reg_num_y = M09_REGISTER_NUM_Y;
1038                 break;
1039
1040         case EV_FT:
1041                 reg_addr->reg_threshold = EV_REGISTER_THRESHOLD;
1042                 reg_addr->reg_report_rate = NO_REGISTER;
1043                 reg_addr->reg_gain = EV_REGISTER_GAIN;
1044                 reg_addr->reg_offset = NO_REGISTER;
1045                 reg_addr->reg_offset_x = EV_REGISTER_OFFSET_X;
1046                 reg_addr->reg_offset_y = EV_REGISTER_OFFSET_Y;
1047                 reg_addr->reg_num_x = NO_REGISTER;
1048                 reg_addr->reg_num_y = NO_REGISTER;
1049                 break;
1050
1051         case GENERIC_FT:
1052                 /* this is a guesswork */
1053                 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
1054                 reg_addr->reg_report_rate = NO_REGISTER;
1055                 reg_addr->reg_gain = M09_REGISTER_GAIN;
1056                 reg_addr->reg_offset = M09_REGISTER_OFFSET;
1057                 reg_addr->reg_offset_x = NO_REGISTER;
1058                 reg_addr->reg_offset_y = NO_REGISTER;
1059                 reg_addr->reg_num_x = NO_REGISTER;
1060                 reg_addr->reg_num_y = NO_REGISTER;
1061                 break;
1062         }
1063 }
1064
1065 static void edt_ft5x06_disable_regulator(void *arg)
1066 {
1067         struct edt_ft5x06_ts_data *data = arg;
1068
1069         regulator_disable(data->vcc);
1070 }
1071
1072 static int edt_ft5x06_ts_probe(struct i2c_client *client,
1073                                          const struct i2c_device_id *id)
1074 {
1075         const struct edt_i2c_chip_data *chip_data;
1076         struct edt_ft5x06_ts_data *tsdata;
1077         u8 buf[2] = { 0xfc, 0x00 };
1078         struct input_dev *input;
1079         unsigned long irq_flags;
1080         int error;
1081         char fw_version[EDT_NAME_LEN];
1082
1083         dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");
1084
1085         tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
1086         if (!tsdata) {
1087                 dev_err(&client->dev, "failed to allocate driver data.\n");
1088                 return -ENOMEM;
1089         }
1090
1091         chip_data = device_get_match_data(&client->dev);
1092         if (!chip_data)
1093                 chip_data = (const struct edt_i2c_chip_data *)id->driver_data;
1094         if (!chip_data || !chip_data->max_support_points) {
1095                 dev_err(&client->dev, "invalid or missing chip data\n");
1096                 return -EINVAL;
1097         }
1098
1099         tsdata->max_support_points = chip_data->max_support_points;
1100
1101         tsdata->vcc = devm_regulator_get(&client->dev, "vcc");
1102         if (IS_ERR(tsdata->vcc)) {
1103                 error = PTR_ERR(tsdata->vcc);
1104                 if (error != -EPROBE_DEFER)
1105                         dev_err(&client->dev,
1106                                 "failed to request regulator: %d\n", error);
1107                 return error;
1108         }
1109
1110         error = regulator_enable(tsdata->vcc);
1111         if (error < 0) {
1112                 dev_err(&client->dev, "failed to enable vcc: %d\n", error);
1113                 return error;
1114         }
1115
1116         error = devm_add_action_or_reset(&client->dev,
1117                                          edt_ft5x06_disable_regulator,
1118                                          tsdata);
1119         if (error)
1120                 return error;
1121
1122         tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev,
1123                                                      "reset", GPIOD_OUT_HIGH);
1124         if (IS_ERR(tsdata->reset_gpio)) {
1125                 error = PTR_ERR(tsdata->reset_gpio);
1126                 dev_err(&client->dev,
1127                         "Failed to request GPIO reset pin, error %d\n", error);
1128                 return error;
1129         }
1130
1131         tsdata->wake_gpio = devm_gpiod_get_optional(&client->dev,
1132                                                     "wake", GPIOD_OUT_LOW);
1133         if (IS_ERR(tsdata->wake_gpio)) {
1134                 error = PTR_ERR(tsdata->wake_gpio);
1135                 dev_err(&client->dev,
1136                         "Failed to request GPIO wake pin, error %d\n", error);
1137                 return error;
1138         }
1139
1140         /*
1141          * Check which sleep modes we can support. Power-off requieres the
1142          * reset-pin to ensure correct power-down/power-up behaviour. Start with
1143          * the EDT_PMODE_POWEROFF test since this is the deepest possible sleep
1144          * mode.
1145          */
1146         if (tsdata->reset_gpio)
1147                 tsdata->suspend_mode = EDT_PMODE_POWEROFF;
1148         else if (tsdata->wake_gpio)
1149                 tsdata->suspend_mode = EDT_PMODE_HIBERNATE;
1150         else
1151                 tsdata->suspend_mode = EDT_PMODE_NOT_SUPPORTED;
1152
1153         if (tsdata->wake_gpio) {
1154                 usleep_range(5000, 6000);
1155                 gpiod_set_value_cansleep(tsdata->wake_gpio, 1);
1156         }
1157
1158         if (tsdata->reset_gpio) {
1159                 usleep_range(5000, 6000);
1160                 gpiod_set_value_cansleep(tsdata->reset_gpio, 0);
1161                 msleep(300);
1162         }
1163
1164         input = devm_input_allocate_device(&client->dev);
1165         if (!input) {
1166                 dev_err(&client->dev, "failed to allocate input device.\n");
1167                 return -ENOMEM;
1168         }
1169
1170         mutex_init(&tsdata->mutex);
1171         tsdata->client = client;
1172         tsdata->input = input;
1173         tsdata->factory_mode = false;
1174
1175         error = edt_ft5x06_ts_identify(client, tsdata, fw_version);
1176         if (error) {
1177                 dev_err(&client->dev, "touchscreen probe failed\n");
1178                 return error;
1179         }
1180
1181         /*
1182          * Dummy read access. EP0700MLP1 returns bogus data on the first
1183          * register read access and ignores writes.
1184          */
1185         edt_ft5x06_ts_readwrite(tsdata->client, 2, buf, 2, buf);
1186
1187         edt_ft5x06_ts_set_regs(tsdata);
1188         edt_ft5x06_ts_get_defaults(&client->dev, tsdata);
1189         edt_ft5x06_ts_get_parameters(tsdata);
1190
1191         dev_dbg(&client->dev,
1192                 "Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
1193                 tsdata->name, fw_version, tsdata->num_x, tsdata->num_y);
1194
1195         input->name = tsdata->name;
1196         input->id.bustype = BUS_I2C;
1197         input->dev.parent = &client->dev;
1198
1199         input_set_abs_params(input, ABS_MT_POSITION_X,
1200                              0, tsdata->num_x * 64 - 1, 0, 0);
1201         input_set_abs_params(input, ABS_MT_POSITION_Y,
1202                              0, tsdata->num_y * 64 - 1, 0, 0);
1203
1204         touchscreen_parse_properties(input, true, &tsdata->prop);
1205
1206         error = input_mt_init_slots(input, tsdata->max_support_points,
1207                                 INPUT_MT_DIRECT);
1208         if (error) {
1209                 dev_err(&client->dev, "Unable to init MT slots.\n");
1210                 return error;
1211         }
1212
1213         i2c_set_clientdata(client, tsdata);
1214
1215         irq_flags = irq_get_trigger_type(client->irq);
1216         if (irq_flags == IRQF_TRIGGER_NONE)
1217                 irq_flags = IRQF_TRIGGER_FALLING;
1218         irq_flags |= IRQF_ONESHOT;
1219
1220         error = devm_request_threaded_irq(&client->dev, client->irq,
1221                                         NULL, edt_ft5x06_ts_isr, irq_flags,
1222                                         client->name, tsdata);
1223         if (error) {
1224                 dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
1225                 return error;
1226         }
1227
1228         error = devm_device_add_group(&client->dev, &edt_ft5x06_attr_group);
1229         if (error)
1230                 return error;
1231
1232         error = input_register_device(input);
1233         if (error)
1234                 return error;
1235
1236         edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
1237
1238         dev_dbg(&client->dev,
1239                 "EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n",
1240                 client->irq,
1241                 tsdata->wake_gpio ? desc_to_gpio(tsdata->wake_gpio) : -1,
1242                 tsdata->reset_gpio ? desc_to_gpio(tsdata->reset_gpio) : -1);
1243
1244         return 0;
1245 }
1246
1247 static int edt_ft5x06_ts_remove(struct i2c_client *client)
1248 {
1249         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1250
1251         edt_ft5x06_ts_teardown_debugfs(tsdata);
1252
1253         return 0;
1254 }
1255
1256 static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev)
1257 {
1258         struct i2c_client *client = to_i2c_client(dev);
1259         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1260         struct gpio_desc *reset_gpio = tsdata->reset_gpio;
1261         int ret;
1262
1263         if (device_may_wakeup(dev))
1264                 return 0;
1265
1266         if (tsdata->suspend_mode == EDT_PMODE_NOT_SUPPORTED)
1267                 return 0;
1268
1269         /* Enter hibernate mode. */
1270         ret = edt_ft5x06_register_write(tsdata, PMOD_REGISTER_OPMODE,
1271                                         PMOD_REGISTER_HIBERNATE);
1272         if (ret)
1273                 dev_warn(dev, "Failed to set hibernate mode\n");
1274
1275         if (tsdata->suspend_mode == EDT_PMODE_HIBERNATE)
1276                 return 0;
1277
1278         /*
1279          * Power-off according the datasheet. Cut the power may leaf the irq
1280          * line in an undefined state depending on the host pull resistor
1281          * settings. Disable the irq to avoid adjusting each host till the
1282          * device is back in a full functional state.
1283          */
1284         disable_irq(tsdata->client->irq);
1285
1286         gpiod_set_value_cansleep(reset_gpio, 1);
1287         usleep_range(1000, 2000);
1288
1289         ret = regulator_disable(tsdata->vcc);
1290         if (ret)
1291                 dev_warn(dev, "Failed to disable vcc\n");
1292
1293         return 0;
1294 }
1295
1296 static int __maybe_unused edt_ft5x06_ts_resume(struct device *dev)
1297 {
1298         struct i2c_client *client = to_i2c_client(dev);
1299         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1300         int ret = 0;
1301
1302         if (device_may_wakeup(dev))
1303                 return 0;
1304
1305         if (tsdata->suspend_mode == EDT_PMODE_NOT_SUPPORTED)
1306                 return 0;
1307
1308         if (tsdata->suspend_mode == EDT_PMODE_POWEROFF) {
1309                 struct gpio_desc *reset_gpio = tsdata->reset_gpio;
1310
1311                 /*
1312                  * We can't check if the regulator is a dummy or a real
1313                  * regulator. So we need to specify the 5ms reset time (T_rst)
1314                  * here instead of the 100us T_rtp time. We also need to wait
1315                  * 300ms in case it was a real supply and the power was cutted
1316                  * of. Toggle the reset pin is also a way to exit the hibernate
1317                  * mode.
1318                  */
1319                 gpiod_set_value_cansleep(reset_gpio, 1);
1320                 usleep_range(5000, 6000);
1321
1322                 ret = regulator_enable(tsdata->vcc);
1323                 if (ret) {
1324                         dev_err(dev, "Failed to enable vcc\n");
1325                         return ret;
1326                 }
1327
1328                 usleep_range(1000, 2000);
1329                 gpiod_set_value_cansleep(reset_gpio, 0);
1330                 msleep(300);
1331
1332                 edt_ft5x06_restore_reg_parameters(tsdata);
1333                 enable_irq(tsdata->client->irq);
1334
1335                 if (tsdata->factory_mode)
1336                         ret = edt_ft5x06_factory_mode(tsdata);
1337         } else {
1338                 struct gpio_desc *wake_gpio = tsdata->wake_gpio;
1339
1340                 gpiod_set_value_cansleep(wake_gpio, 0);
1341                 usleep_range(5000, 6000);
1342                 gpiod_set_value_cansleep(wake_gpio, 1);
1343         }
1344
1345
1346         return ret;
1347 }
1348
1349 static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
1350                          edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);
1351
1352 static const struct edt_i2c_chip_data edt_ft5x06_data = {
1353         .max_support_points = 5,
1354 };
1355
1356 static const struct edt_i2c_chip_data edt_ft5506_data = {
1357         .max_support_points = 10,
1358 };
1359
1360 static const struct edt_i2c_chip_data edt_ft6236_data = {
1361         .max_support_points = 2,
1362 };
1363
1364 static const struct i2c_device_id edt_ft5x06_ts_id[] = {
1365         { .name = "edt-ft5x06", .driver_data = (long)&edt_ft5x06_data },
1366         { .name = "edt-ft5506", .driver_data = (long)&edt_ft5506_data },
1367         { .name = "ev-ft5726", .driver_data = (long)&edt_ft5506_data },
1368         /* Note no edt- prefix for compatibility with the ft6236.c driver */
1369         { .name = "ft6236", .driver_data = (long)&edt_ft6236_data },
1370         { /* sentinel */ }
1371 };
1372 MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
1373
1374 static const struct of_device_id edt_ft5x06_of_match[] = {
1375         { .compatible = "edt,edt-ft5206", .data = &edt_ft5x06_data },
1376         { .compatible = "edt,edt-ft5306", .data = &edt_ft5x06_data },
1377         { .compatible = "edt,edt-ft5406", .data = &edt_ft5x06_data },
1378         { .compatible = "edt,edt-ft5506", .data = &edt_ft5506_data },
1379         { .compatible = "evervision,ev-ft5726", .data = &edt_ft5506_data },
1380         /* Note focaltech vendor prefix for compatibility with ft6236.c */
1381         { .compatible = "focaltech,ft6236", .data = &edt_ft6236_data },
1382         { /* sentinel */ }
1383 };
1384 MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match);
1385
1386 static struct i2c_driver edt_ft5x06_ts_driver = {
1387         .driver = {
1388                 .name = "edt_ft5x06",
1389                 .of_match_table = edt_ft5x06_of_match,
1390                 .pm = &edt_ft5x06_ts_pm_ops,
1391                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1392         },
1393         .id_table = edt_ft5x06_ts_id,
1394         .probe    = edt_ft5x06_ts_probe,
1395         .remove   = edt_ft5x06_ts_remove,
1396 };
1397
1398 module_i2c_driver(edt_ft5x06_ts_driver);
1399
1400 MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>");
1401 MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
1402 MODULE_LICENSE("GPL v2");