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 #define POLL_INTERVAL_MS                17      /* 17ms = 60fps */
  76
  77 enum edt_pmode {
  78         EDT_PMODE_NOT_SUPPORTED,
  79         EDT_PMODE_HIBERNATE,
  80         EDT_PMODE_POWEROFF,
  81 };
  82
  83 enum edt_ver {
  84         EDT_M06,
  85         EDT_M09,
  86         EDT_M12,
  87         EV_FT,
  88         GENERIC_FT,
  89 };
  90
  91 struct edt_reg_addr {
  92         int reg_threshold;
  93         int reg_report_rate;
  94         int reg_gain;
  95         int reg_offset;
  96         int reg_offset_x;
  97         int reg_offset_y;
  98         int reg_num_x;
  99         int reg_num_y;
 100 };
 101
 102 struct edt_ft5x06_ts_data {
 103         struct i2c_client *client;
 104         struct input_dev *input;
 105         struct touchscreen_properties prop;
 106         u16 num_x;
 107         u16 num_y;
 108         struct regulator *vcc;
 109         struct regulator *iovcc;
 110
 111         struct gpio_desc *reset_gpio;
 112         struct gpio_desc *wake_gpio;
 113
 114 #if defined(CONFIG_DEBUG_FS)
 115         struct dentry *debug_dir;
 116         u8 *raw_buffer;
 117         size_t raw_bufsize;
 118 #endif
 119
 120         struct mutex mutex;
 121         bool factory_mode;
 122         enum edt_pmode suspend_mode;
 123         int threshold;
 124         int gain;
 125         int offset;
 126         int offset_x;
 127         int offset_y;
 128         int report_rate;
 129         int max_support_points;
 130         unsigned int known_ids;
 131
 132         char name[EDT_NAME_LEN];
 133
 134         struct edt_reg_addr reg_addr;
 135         enum edt_ver version;
 136
 137         struct timer_list timer;
 138         struct work_struct work_i2c_poll;
 139 };
 140
 141 struct edt_i2c_chip_data {
 142         int  max_support_points;
 143 };
 144
 145 static int edt_ft5x06_ts_readwrite(struct i2c_client *client,
 146                                    u16 wr_len, u8 *wr_buf,
 147                                    u16 rd_len, u8 *rd_buf)
 148 {
 149         struct i2c_msg wrmsg[2];
 150         int i = 0;
 151         int ret;
 152
 153         if (wr_len) {
 154                 wrmsg[i].addr  = client->addr;
 155                 wrmsg[i].flags = 0;
 156                 wrmsg[i].len = wr_len;
 157                 wrmsg[i].buf = wr_buf;
 158                 i++;
 159         }
 160         if (rd_len) {
 161                 wrmsg[i].addr  = client->addr;
 162                 wrmsg[i].flags = I2C_M_RD;
 163                 wrmsg[i].len = rd_len;
 164                 wrmsg[i].buf = rd_buf;
 165                 i++;
 166         }
 167
 168         ret = i2c_transfer(client->adapter, wrmsg, i);
 169         if (ret < 0)
 170                 return ret;
 171         if (ret != i)
 172                 return -EIO;
 173
 174         return 0;
 175 }
 176
 177 static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata,
 178                                     u8 *buf, int buflen)
 179 {
 180         int i;
 181         u8 crc = 0;
 182
 183         for (i = 0; i < buflen - 1; i++)
 184                 crc ^= buf[i];
 185
 186         if (crc != buf[buflen-1]) {
 187                 dev_err_ratelimited(&tsdata->client->dev,
 188                                     "crc error: 0x%02x expected, got 0x%02x\n",
 189                                     crc, buf[buflen-1]);
 190                 return false;
 191         }
 192
 193         return true;
 194 }
 195
 196 static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
 197 {
 198         struct edt_ft5x06_ts_data *tsdata = dev_id;
 199         struct device *dev = &tsdata->client->dev;
 200         u8 cmd;
 201         u8 rdbuf[63];
 202         int i, type, x, y, id;
 203         int offset, tplen, datalen, crclen;
 204         int error;
 205         unsigned int active_ids = 0, known_ids = tsdata->known_ids;
 206         long released_ids;
 207         int b = 0;
 208         unsigned int num_points;
 209
 210         switch (tsdata->version) {
 211         case EDT_M06:
 212                 cmd = 0xf9; /* tell the controller to send touch data */
 213                 offset = 5; /* where the actual touch data starts */
 214                 tplen = 4;  /* data comes in so called frames */
 215                 crclen = 1; /* length of the crc data */
 216                 break;
 217
 218         case EDT_M09:
 219         case EDT_M12:
 220         case EV_FT:
 221         case GENERIC_FT:
 222                 cmd = 0x0;
 223                 offset = 3;
 224                 tplen = 6;
 225                 crclen = 0;
 226                 break;
 227
 228         default:
 229                 goto out;
 230         }
 231
 232         memset(rdbuf, 0, sizeof(rdbuf));
 233         datalen = tplen * tsdata->max_support_points + offset + crclen;
 234
 235         error = edt_ft5x06_ts_readwrite(tsdata->client,
 236                                         sizeof(cmd), &cmd,
 237                                         datalen, rdbuf);
 238         if (error) {
 239                 dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
 240                                     error);
 241                 goto out;
 242         }
 243
 244         /* M09/M12 does not send header or CRC */
 245         if (tsdata->version == EDT_M06) {
 246                 if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa ||
 247                         rdbuf[2] != datalen) {
 248                         dev_err_ratelimited(dev,
 249                                         "Unexpected header: %02x%02x%02x!\n",
 250                                         rdbuf[0], rdbuf[1], rdbuf[2]);
 251                         goto out;
 252                 }
 253
 254                 if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, datalen))
 255                         goto out;
 256                 num_points = tsdata->max_support_points;
 257         } else {
 258                 /* Register 2 is TD_STATUS, containing the number of touch
 259                  * points.
 260                  */
 261                 num_points = min(rdbuf[2] & 0xf, tsdata->max_support_points);
 262         }
 263
 264         for (i = 0; i < num_points; i++) {
 265                 u8 *buf = &rdbuf[i * tplen + offset];
 266
 267                 type = buf[0] >> 6;
 268                 /* ignore Reserved events */
 269                 if (type == TOUCH_EVENT_RESERVED)
 270                         continue;
 271
 272                 /* M06 sometimes sends bogus coordinates in TOUCH_DOWN */
 273                 if (tsdata->version == EDT_M06 && type == TOUCH_EVENT_DOWN)
 274                         continue;
 275
 276                 x = get_unaligned_be16(buf) & 0x0fff;
 277                 y = get_unaligned_be16(buf + 2) & 0x0fff;
 278                 /* The FT5x26 send the y coordinate first */
 279                 if (tsdata->version == EV_FT)
 280                         swap(x, y);
 281
 282                 id = (buf[2] >> 4) & 0x0f;
 283
 284                 input_mt_slot(tsdata->input, id);
 285                 if (input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER,
 286                                                type != TOUCH_EVENT_UP)) {
 287                         touchscreen_report_pos(tsdata->input, &tsdata->prop,
 288                                                x, y, true);
 289                         active_ids |= BIT(id);
 290                 } else {
 291                         known_ids &= ~BIT(id);
 292                 }
 293         }
 294
 295         /* One issue with the device is the TOUCH_UP message is not always
 296          * returned. Instead track which ids we know about and report when they
 297          * are no longer updated
 298          */
 299         released_ids = known_ids & ~active_ids;
 300         for_each_set_bit_from(b, &released_ids, tsdata->max_support_points) {
 301                 input_mt_slot(tsdata->input, b);
 302                 input_mt_report_slot_inactive(tsdata->input);
 303         }
 304         tsdata->known_ids = active_ids;
 305
 306         input_mt_report_pointer_emulation(tsdata->input, true);
 307         input_sync(tsdata->input);
 308
 309 out:
 310         return IRQ_HANDLED;
 311 }
 312
 313 static void edt_ft5x06_ts_irq_poll_timer(struct timer_list *t)
 314 {
 315         struct edt_ft5x06_ts_data *tsdata = from_timer(tsdata, t, timer);
 316
 317         schedule_work(&tsdata->work_i2c_poll);
 318         mod_timer(&tsdata->timer, jiffies + msecs_to_jiffies(POLL_INTERVAL_MS));
 319 }
 320
 321 static void edt_ft5x06_ts_work_i2c_poll(struct work_struct *work)
 322 {
 323         struct edt_ft5x06_ts_data *tsdata = container_of(work,
 324                         struct edt_ft5x06_ts_data, work_i2c_poll);
 325
 326         edt_ft5x06_ts_isr(0, tsdata);
 327 }
 328
 329 static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
 330                                      u8 addr, u8 value)
 331 {
 332         u8 wrbuf[4];
 333
 334         switch (tsdata->version) {
 335         case EDT_M06:
 336                 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
 337                 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
 338                 wrbuf[2] = value;
 339                 wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2];
 340                 return edt_ft5x06_ts_readwrite(tsdata->client, 4,
 341                                         wrbuf, 0, NULL);
 342
 343         case EDT_M09:
 344         case EDT_M12:
 345         case EV_FT:
 346         case GENERIC_FT:
 347                 wrbuf[0] = addr;
 348                 wrbuf[1] = value;
 349
 350                 return edt_ft5x06_ts_readwrite(tsdata->client, 2,
 351                                         wrbuf, 0, NULL);
 352
 353         default:
 354                 return -EINVAL;
 355         }
 356 }
 357
 358 static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
 359                                     u8 addr)
 360 {
 361         u8 wrbuf[2], rdbuf[2];
 362         int error;
 363
 364         switch (tsdata->version) {
 365         case EDT_M06:
 366                 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
 367                 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
 368                 wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
 369
 370                 error = edt_ft5x06_ts_readwrite(tsdata->client, 2, wrbuf, 2,
 371                                                 rdbuf);
 372                 if (error)
 373                         return error;
 374
 375                 if ((wrbuf[0] ^ wrbuf[1] ^ rdbuf[0]) != rdbuf[1]) {
 376                         dev_err(&tsdata->client->dev,
 377                                 "crc error: 0x%02x expected, got 0x%02x\n",
 378                                 wrbuf[0] ^ wrbuf[1] ^ rdbuf[0],
 379                                 rdbuf[1]);
 380                         return -EIO;
 381                 }
 382                 break;
 383
 384         case EDT_M09:
 385         case EDT_M12:
 386         case EV_FT:
 387         case GENERIC_FT:
 388                 wrbuf[0] = addr;
 389                 error = edt_ft5x06_ts_readwrite(tsdata->client, 1,
 390                                                 wrbuf, 1, rdbuf);
 391                 if (error)
 392                         return error;
 393                 break;
 394
 395         default:
 396                 return -EINVAL;
 397         }
 398
 399         return rdbuf[0];
 400 }
 401
 402 struct edt_ft5x06_attribute {
 403         struct device_attribute dattr;
 404         size_t field_offset;
 405         u8 limit_low;
 406         u8 limit_high;
 407         u8 addr_m06;
 408         u8 addr_m09;
 409         u8 addr_ev;
 410 };
 411
 412 #define EDT_ATTR(_field, _mode, _addr_m06, _addr_m09, _addr_ev,         \
 413                 _limit_low, _limit_high)                                \
 414         struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = {        \
 415                 .dattr = __ATTR(_field, _mode,                          \
 416                                 edt_ft5x06_setting_show,                \
 417                                 edt_ft5x06_setting_store),              \
 418                 .field_offset = offsetof(struct edt_ft5x06_ts_data, _field), \
 419                 .addr_m06 = _addr_m06,                                  \
 420                 .addr_m09 = _addr_m09,                                  \
 421                 .addr_ev  = _addr_ev,                                   \
 422                 .limit_low = _limit_low,                                \
 423                 .limit_high = _limit_high,                              \
 424         }
 425
 426 static ssize_t edt_ft5x06_setting_show(struct device *dev,
 427                                        struct device_attribute *dattr,
 428                                        char *buf)
 429 {
 430         struct i2c_client *client = to_i2c_client(dev);
 431         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
 432         struct edt_ft5x06_attribute *attr =
 433                         container_of(dattr, struct edt_ft5x06_attribute, dattr);
 434         u8 *field = (u8 *)tsdata + attr->field_offset;
 435         int val;
 436         size_t count = 0;
 437         int error = 0;
 438         u8 addr;
 439
 440         mutex_lock(&tsdata->mutex);
 441
 442         if (tsdata->factory_mode) {
 443                 error = -EIO;
 444                 goto out;
 445         }
 446
 447         switch (tsdata->version) {
 448         case EDT_M06:
 449                 addr = attr->addr_m06;
 450                 break;
 451
 452         case EDT_M09:
 453         case EDT_M12:
 454         case GENERIC_FT:
 455                 addr = attr->addr_m09;
 456                 break;
 457
 458         case EV_FT:
 459                 addr = attr->addr_ev;
 460                 break;
 461
 462         default:
 463                 error = -ENODEV;
 464                 goto out;
 465         }
 466
 467         if (addr != NO_REGISTER) {
 468                 val = edt_ft5x06_register_read(tsdata, addr);
 469                 if (val < 0) {
 470                         error = val;
 471                         dev_err(&tsdata->client->dev,
 472                                 "Failed to fetch attribute %s, error %d\n",
 473                                 dattr->attr.name, error);
 474                         goto out;
 475                 }
 476         } else {
 477                 val = *field;
 478         }
 479
 480         if (val != *field) {
 481                 dev_warn(&tsdata->client->dev,
 482                          "%s: read (%d) and stored value (%d) differ\n",
 483                          dattr->attr.name, val, *field);
 484                 *field = val;
 485         }
 486
 487         count = scnprintf(buf, PAGE_SIZE, "%d\n", val);
 488 out:
 489         mutex_unlock(&tsdata->mutex);
 490         return error ?: count;
 491 }
 492
 493 static ssize_t edt_ft5x06_setting_store(struct device *dev,
 494                                         struct device_attribute *dattr,
 495                                         const char *buf, size_t count)
 496 {
 497         struct i2c_client *client = to_i2c_client(dev);
 498         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
 499         struct edt_ft5x06_attribute *attr =
 500                         container_of(dattr, struct edt_ft5x06_attribute, dattr);
 501         u8 *field = (u8 *)tsdata + attr->field_offset;
 502         unsigned int val;
 503         int error;
 504         u8 addr;
 505
 506         mutex_lock(&tsdata->mutex);
 507
 508         if (tsdata->factory_mode) {
 509                 error = -EIO;
 510                 goto out;
 511         }
 512
 513         error = kstrtouint(buf, 0, &val);
 514         if (error)
 515                 goto out;
 516
 517         if (val < attr->limit_low || val > attr->limit_high) {
 518                 error = -ERANGE;
 519                 goto out;
 520         }
 521
 522         switch (tsdata->version) {
 523         case EDT_M06:
 524                 addr = attr->addr_m06;
 525                 break;
 526
 527         case EDT_M09:
 528         case EDT_M12:
 529         case GENERIC_FT:
 530                 addr = attr->addr_m09;
 531                 break;
 532
 533         case EV_FT:
 534                 addr = attr->addr_ev;
 535                 break;
 536
 537         default:
 538                 error = -ENODEV;
 539                 goto out;
 540         }
 541
 542         if (addr != NO_REGISTER) {
 543                 error = edt_ft5x06_register_write(tsdata, addr, val);
 544                 if (error) {
 545                         dev_err(&tsdata->client->dev,
 546                                 "Failed to update attribute %s, error: %d\n",
 547                                 dattr->attr.name, error);
 548                         goto out;
 549                 }
 550         }
 551         *field = val;
 552
 553 out:
 554         mutex_unlock(&tsdata->mutex);
 555         return error ?: count;
 556 }
 557
 558 /* m06, m09: range 0-31, m12: range 0-5 */
 559 static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN,
 560                 M09_REGISTER_GAIN, EV_REGISTER_GAIN, 0, 31);
 561 /* m06, m09: range 0-31, m12: range 0-16 */
 562 static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET,
 563                 M09_REGISTER_OFFSET, NO_REGISTER, 0, 31);
 564 /* m06, m09, m12: no supported, ev_ft: range 0-80 */
 565 static EDT_ATTR(offset_x, S_IWUSR | S_IRUGO, NO_REGISTER, NO_REGISTER,
 566                 EV_REGISTER_OFFSET_X, 0, 80);
 567 /* m06, m09, m12: no supported, ev_ft: range 0-80 */
 568 static EDT_ATTR(offset_y, S_IWUSR | S_IRUGO, NO_REGISTER, NO_REGISTER,
 569                 EV_REGISTER_OFFSET_Y, 0, 80);
 570 /* m06: range 20 to 80, m09: range 0 to 30, m12: range 1 to 255... */
 571 static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD,
 572                 M09_REGISTER_THRESHOLD, EV_REGISTER_THRESHOLD, 0, 255);
 573 /* m06: range 3 to 14, m12: (0x64: 100Hz) */
 574 static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE,
 575                 NO_REGISTER, NO_REGISTER, 0, 255);
 576
 577 static struct attribute *edt_ft5x06_attrs[] = {
 578         &edt_ft5x06_attr_gain.dattr.attr,
 579         &edt_ft5x06_attr_offset.dattr.attr,
 580         &edt_ft5x06_attr_offset_x.dattr.attr,
 581         &edt_ft5x06_attr_offset_y.dattr.attr,
 582         &edt_ft5x06_attr_threshold.dattr.attr,
 583         &edt_ft5x06_attr_report_rate.dattr.attr,
 584         NULL
 585 };
 586
 587 static const struct attribute_group edt_ft5x06_attr_group = {
 588         .attrs = edt_ft5x06_attrs,
 589 };
 590
 591 static void edt_ft5x06_restore_reg_parameters(struct edt_ft5x06_ts_data *tsdata)
 592 {
 593         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 594
 595         edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold,
 596                                   tsdata->threshold);
 597         edt_ft5x06_register_write(tsdata, reg_addr->reg_gain,
 598                                   tsdata->gain);
 599         if (reg_addr->reg_offset != NO_REGISTER)
 600                 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset,
 601                                           tsdata->offset);
 602         if (reg_addr->reg_offset_x != NO_REGISTER)
 603                 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_x,
 604                                           tsdata->offset_x);
 605         if (reg_addr->reg_offset_y != NO_REGISTER)
 606                 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_y,
 607                                           tsdata->offset_y);
 608         if (reg_addr->reg_report_rate != NO_REGISTER)
 609                 edt_ft5x06_register_write(tsdata, reg_addr->reg_report_rate,
 610                                   tsdata->report_rate);
 611
 612 }
 613
 614 #ifdef CONFIG_DEBUG_FS
 615 static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
 616 {
 617         struct i2c_client *client = tsdata->client;
 618         int retries = EDT_SWITCH_MODE_RETRIES;
 619         int ret;
 620         int error;
 621
 622         if (tsdata->version != EDT_M06) {
 623                 dev_err(&client->dev,
 624                         "No factory mode support for non-M06 devices\n");
 625                 return -EINVAL;
 626         }
 627
 628         disable_irq(client->irq);
 629
 630         if (!tsdata->raw_buffer) {
 631                 tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y *
 632                                       sizeof(u16);
 633                 tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
 634                 if (!tsdata->raw_buffer) {
 635                         error = -ENOMEM;
 636                         goto err_out;
 637                 }
 638         }
 639
 640         /* mode register is 0x3c when in the work mode */
 641         error = edt_ft5x06_register_write(tsdata, WORK_REGISTER_OPMODE, 0x03);
 642         if (error) {
 643                 dev_err(&client->dev,
 644                         "failed to switch to factory mode, error %d\n", error);
 645                 goto err_out;
 646         }
 647
 648         tsdata->factory_mode = true;
 649         do {
 650                 mdelay(EDT_SWITCH_MODE_DELAY);
 651                 /* mode register is 0x01 when in factory mode */
 652                 ret = edt_ft5x06_register_read(tsdata, FACTORY_REGISTER_OPMODE);
 653                 if (ret == 0x03)
 654                         break;
 655         } while (--retries > 0);
 656
 657         if (retries == 0) {
 658                 dev_err(&client->dev, "not in factory mode after %dms.\n",
 659                         EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
 660                 error = -EIO;
 661                 goto err_out;
 662         }
 663
 664         return 0;
 665
 666 err_out:
 667         kfree(tsdata->raw_buffer);
 668         tsdata->raw_buffer = NULL;
 669         tsdata->factory_mode = false;
 670         enable_irq(client->irq);
 671
 672         return error;
 673 }
 674
 675 static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
 676 {
 677         struct i2c_client *client = tsdata->client;
 678         int retries = EDT_SWITCH_MODE_RETRIES;
 679         int ret;
 680         int error;
 681
 682         /* mode register is 0x01 when in the factory mode */
 683         error = edt_ft5x06_register_write(tsdata, FACTORY_REGISTER_OPMODE, 0x1);
 684         if (error) {
 685                 dev_err(&client->dev,
 686                         "failed to switch to work mode, error: %d\n", error);
 687                 return error;
 688         }
 689
 690         tsdata->factory_mode = false;
 691
 692         do {
 693                 mdelay(EDT_SWITCH_MODE_DELAY);
 694                 /* mode register is 0x01 when in factory mode */
 695                 ret = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OPMODE);
 696                 if (ret == 0x01)
 697                         break;
 698         } while (--retries > 0);
 699
 700         if (retries == 0) {
 701                 dev_err(&client->dev, "not in work mode after %dms.\n",
 702                         EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
 703                 tsdata->factory_mode = true;
 704                 return -EIO;
 705         }
 706
 707         kfree(tsdata->raw_buffer);
 708         tsdata->raw_buffer = NULL;
 709
 710         edt_ft5x06_restore_reg_parameters(tsdata);
 711         enable_irq(client->irq);
 712
 713         return 0;
 714 }
 715
 716 static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
 717 {
 718         struct edt_ft5x06_ts_data *tsdata = data;
 719
 720         *mode = tsdata->factory_mode;
 721
 722         return 0;
 723 };
 724
 725 static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode)
 726 {
 727         struct edt_ft5x06_ts_data *tsdata = data;
 728         int retval = 0;
 729
 730         if (mode > 1)
 731                 return -ERANGE;
 732
 733         mutex_lock(&tsdata->mutex);
 734
 735         if (mode != tsdata->factory_mode) {
 736                 retval = mode ? edt_ft5x06_factory_mode(tsdata) :
 737                                 edt_ft5x06_work_mode(tsdata);
 738         }
 739
 740         mutex_unlock(&tsdata->mutex);
 741
 742         return retval;
 743 };
 744
 745 DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get,
 746                         edt_ft5x06_debugfs_mode_set, "%llu\n");
 747
 748 static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
 749                                 char __user *buf, size_t count, loff_t *off)
 750 {
 751         struct edt_ft5x06_ts_data *tsdata = file->private_data;
 752         struct i2c_client *client = tsdata->client;
 753         int retries  = EDT_RAW_DATA_RETRIES;
 754         int val, i, error;
 755         size_t read = 0;
 756         int colbytes;
 757         char wrbuf[3];
 758         u8 *rdbuf;
 759
 760         if (*off < 0 || *off >= tsdata->raw_bufsize)
 761                 return 0;
 762
 763         mutex_lock(&tsdata->mutex);
 764
 765         if (!tsdata->factory_mode || !tsdata->raw_buffer) {
 766                 error = -EIO;
 767                 goto out;
 768         }
 769
 770         error = edt_ft5x06_register_write(tsdata, 0x08, 0x01);
 771         if (error) {
 772                 dev_dbg(&client->dev,
 773                         "failed to write 0x08 register, error %d\n", error);
 774                 goto out;
 775         }
 776
 777         do {
 778                 usleep_range(EDT_RAW_DATA_DELAY, EDT_RAW_DATA_DELAY + 100);
 779                 val = edt_ft5x06_register_read(tsdata, 0x08);
 780                 if (val < 1)
 781                         break;
 782         } while (--retries > 0);
 783
 784         if (val < 0) {
 785                 error = val;
 786                 dev_dbg(&client->dev,
 787                         "failed to read 0x08 register, error %d\n", error);
 788                 goto out;
 789         }
 790
 791         if (retries == 0) {
 792                 dev_dbg(&client->dev,
 793                         "timed out waiting for register to settle\n");
 794                 error = -ETIMEDOUT;
 795                 goto out;
 796         }
 797
 798         rdbuf = tsdata->raw_buffer;
 799         colbytes = tsdata->num_y * sizeof(u16);
 800
 801         wrbuf[0] = 0xf5;
 802         wrbuf[1] = 0x0e;
 803         for (i = 0; i < tsdata->num_x; i++) {
 804                 wrbuf[2] = i;  /* column index */
 805                 error = edt_ft5x06_ts_readwrite(tsdata->client,
 806                                                 sizeof(wrbuf), wrbuf,
 807                                                 colbytes, rdbuf);
 808                 if (error)
 809                         goto out;
 810
 811                 rdbuf += colbytes;
 812         }
 813
 814         read = min_t(size_t, count, tsdata->raw_bufsize - *off);
 815         if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) {
 816                 error = -EFAULT;
 817                 goto out;
 818         }
 819
 820         *off += read;
 821 out:
 822         mutex_unlock(&tsdata->mutex);
 823         return error ?: read;
 824 };
 825
 826 static const struct file_operations debugfs_raw_data_fops = {
 827         .open = simple_open,
 828         .read = edt_ft5x06_debugfs_raw_data_read,
 829 };
 830
 831 static void edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
 832                                           const char *debugfs_name)
 833 {
 834         tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
 835
 836         debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x);
 837         debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y);
 838
 839         debugfs_create_file("mode", S_IRUSR | S_IWUSR,
 840                             tsdata->debug_dir, tsdata, &debugfs_mode_fops);
 841         debugfs_create_file("raw_data", S_IRUSR,
 842                             tsdata->debug_dir, tsdata, &debugfs_raw_data_fops);
 843 }
 844
 845 static void edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
 846 {
 847         debugfs_remove_recursive(tsdata->debug_dir);
 848         kfree(tsdata->raw_buffer);
 849 }
 850
 851 #else
 852
 853 static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
 854 {
 855         return -ENOSYS;
 856 }
 857
 858 static void edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
 859                                           const char *debugfs_name)
 860 {
 861 }
 862
 863 static void edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
 864 {
 865 }
 866
 867 #endif /* CONFIG_DEBUGFS */
 868
 869 static int edt_ft5x06_ts_identify(struct i2c_client *client,
 870                                         struct edt_ft5x06_ts_data *tsdata,
 871                                         char *fw_version)
 872 {
 873         u8 rdbuf[EDT_NAME_LEN];
 874         char *p;
 875         int error;
 876         char *model_name = tsdata->name;
 877
 878         /* see what we find if we assume it is a M06 *
 879          * if we get less than EDT_NAME_LEN, we don't want
 880          * to have garbage in there
 881          */
 882         memset(rdbuf, 0, sizeof(rdbuf));
 883         error = edt_ft5x06_ts_readwrite(client, 1, "\xBB",
 884                                         EDT_NAME_LEN - 1, rdbuf);
 885         if (error)
 886                 return error;
 887
 888         /* Probe content for something consistent.
 889          * M06 starts with a response byte, M12 gives the data directly.
 890          * M09/Generic does not provide model number information.
 891          */
 892         if (!strncasecmp(rdbuf + 1, "EP0", 3)) {
 893                 tsdata->version = EDT_M06;
 894
 895                 /* remove last '$' end marker */
 896                 rdbuf[EDT_NAME_LEN - 1] = '\0';
 897                 if (rdbuf[EDT_NAME_LEN - 2] == '$')
 898                         rdbuf[EDT_NAME_LEN - 2] = '\0';
 899
 900                 /* look for Model/Version separator */
 901                 p = strchr(rdbuf, '*');
 902                 if (p)
 903                         *p++ = '\0';
 904                 strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
 905                 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
 906         } else if (!strncasecmp(rdbuf, "EP0", 3)) {
 907                 tsdata->version = EDT_M12;
 908
 909                 /* remove last '$' end marker */
 910                 rdbuf[EDT_NAME_LEN - 2] = '\0';
 911                 if (rdbuf[EDT_NAME_LEN - 3] == '$')
 912                         rdbuf[EDT_NAME_LEN - 3] = '\0';
 913
 914                 /* look for Model/Version separator */
 915                 p = strchr(rdbuf, '*');
 916                 if (p)
 917                         *p++ = '\0';
 918                 strlcpy(model_name, rdbuf, EDT_NAME_LEN);
 919                 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
 920         } else {
 921                 /* If it is not an EDT M06/M12 touchscreen, then the model
 922                  * detection is a bit hairy. The different ft5x06
 923                  * firmares around don't reliably implement the
 924                  * identification registers. Well, we'll take a shot.
 925                  *
 926                  * The main difference between generic focaltec based
 927                  * touches and EDT M09 is that we know how to retrieve
 928                  * the max coordinates for the latter.
 929                  */
 930                 tsdata->version = GENERIC_FT;
 931
 932                 error = edt_ft5x06_ts_readwrite(client, 1, "\xA6",
 933                                                 2, rdbuf);
 934                 if (error)
 935                         return error;
 936
 937                 strlcpy(fw_version, rdbuf, 2);
 938
 939                 error = edt_ft5x06_ts_readwrite(client, 1, "\xA8",
 940                                                 1, rdbuf);
 941                 if (error)
 942                         return error;
 943
 944                 /* This "model identification" is not exact. Unfortunately
 945                  * not all firmwares for the ft5x06 put useful values in
 946                  * the identification registers.
 947                  */
 948                 switch (rdbuf[0]) {
 949                 case 0x11:   /* EDT EP0110M09 */
 950                 case 0x35:   /* EDT EP0350M09 */
 951                 case 0x43:   /* EDT EP0430M09 */
 952                 case 0x50:   /* EDT EP0500M09 */
 953                 case 0x57:   /* EDT EP0570M09 */
 954                 case 0x70:   /* EDT EP0700M09 */
 955                         tsdata->version = EDT_M09;
 956                         snprintf(model_name, EDT_NAME_LEN, "EP0%i%i0M09",
 957                                 rdbuf[0] >> 4, rdbuf[0] & 0x0F);
 958                         break;
 959                 case 0xa1:   /* EDT EP1010ML00 */
 960                         tsdata->version = EDT_M09;
 961                         snprintf(model_name, EDT_NAME_LEN, "EP%i%i0ML00",
 962                                 rdbuf[0] >> 4, rdbuf[0] & 0x0F);
 963                         break;
 964                 case 0x5a:   /* Solomon Goldentek Display */
 965                         snprintf(model_name, EDT_NAME_LEN, "GKTW50SCED1R0");
 966                         break;
 967                 case 0x59:  /* Evervision Display with FT5xx6 TS */
 968                         tsdata->version = EV_FT;
 969                         error = edt_ft5x06_ts_readwrite(client, 1, "\x53",
 970                                                         1, rdbuf);
 971                         if (error)
 972                                 return error;
 973                         strlcpy(fw_version, rdbuf, 1);
 974                         snprintf(model_name, EDT_NAME_LEN,
 975                                  "EVERVISION-FT5726NEi");
 976                         break;
 977                 default:
 978                         snprintf(model_name, EDT_NAME_LEN,
 979                                  "generic ft5x06 (%02x)",
 980                                  rdbuf[0]);
 981                         break;
 982                 }
 983         }
 984
 985         return 0;
 986 }
 987
 988 static void edt_ft5x06_ts_get_defaults(struct device *dev,
 989                                        struct edt_ft5x06_ts_data *tsdata)
 990 {
 991         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 992         u32 val;
 993         int error;
 994
 995         error = device_property_read_u32(dev, "threshold", &val);
 996         if (!error) {
 997                 edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold, val);
 998                 tsdata->threshold = val;
 999         }
1000
1001         error = device_property_read_u32(dev, "gain", &val);
1002         if (!error) {
1003                 edt_ft5x06_register_write(tsdata, reg_addr->reg_gain, val);
1004                 tsdata->gain = val;
1005         }
1006
1007         error = device_property_read_u32(dev, "offset", &val);
1008         if (!error) {
1009                 if (reg_addr->reg_offset != NO_REGISTER)
1010                         edt_ft5x06_register_write(tsdata,
1011                                                   reg_addr->reg_offset, val);
1012                 tsdata->offset = val;
1013         }
1014
1015         error = device_property_read_u32(dev, "offset-x", &val);
1016         if (!error) {
1017                 if (reg_addr->reg_offset_x != NO_REGISTER)
1018                         edt_ft5x06_register_write(tsdata,
1019                                                   reg_addr->reg_offset_x, val);
1020                 tsdata->offset_x = val;
1021         }
1022
1023         error = device_property_read_u32(dev, "offset-y", &val);
1024         if (!error) {
1025                 if (reg_addr->reg_offset_y != NO_REGISTER)
1026                         edt_ft5x06_register_write(tsdata,
1027                                                   reg_addr->reg_offset_y, val);
1028                 tsdata->offset_y = val;
1029         }
1030 }
1031
1032 static void edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
1033 {
1034         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
1035
1036         tsdata->threshold = edt_ft5x06_register_read(tsdata,
1037                                                      reg_addr->reg_threshold);
1038         tsdata->gain = edt_ft5x06_register_read(tsdata, reg_addr->reg_gain);
1039         if (reg_addr->reg_offset != NO_REGISTER)
1040                 tsdata->offset =
1041                         edt_ft5x06_register_read(tsdata, reg_addr->reg_offset);
1042         if (reg_addr->reg_offset_x != NO_REGISTER)
1043                 tsdata->offset_x = edt_ft5x06_register_read(tsdata,
1044                                                 reg_addr->reg_offset_x);
1045         if (reg_addr->reg_offset_y != NO_REGISTER)
1046                 tsdata->offset_y = edt_ft5x06_register_read(tsdata,
1047                                                 reg_addr->reg_offset_y);
1048         if (reg_addr->reg_report_rate != NO_REGISTER)
1049                 tsdata->report_rate = edt_ft5x06_register_read(tsdata,
1050                                                 reg_addr->reg_report_rate);
1051         tsdata->num_x = EDT_DEFAULT_NUM_X;
1052         if (reg_addr->reg_num_x != NO_REGISTER)
1053                 tsdata->num_x = edt_ft5x06_register_read(tsdata,
1054                                                          reg_addr->reg_num_x);
1055         tsdata->num_y = EDT_DEFAULT_NUM_Y;
1056         if (reg_addr->reg_num_y != NO_REGISTER)
1057                 tsdata->num_y = edt_ft5x06_register_read(tsdata,
1058                                                          reg_addr->reg_num_y);
1059 }
1060
1061 static void edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
1062 {
1063         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
1064
1065         switch (tsdata->version) {
1066         case EDT_M06:
1067                 reg_addr->reg_threshold = WORK_REGISTER_THRESHOLD;
1068                 reg_addr->reg_report_rate = WORK_REGISTER_REPORT_RATE;
1069                 reg_addr->reg_gain = WORK_REGISTER_GAIN;
1070                 reg_addr->reg_offset = WORK_REGISTER_OFFSET;
1071                 reg_addr->reg_offset_x = NO_REGISTER;
1072                 reg_addr->reg_offset_y = NO_REGISTER;
1073                 reg_addr->reg_num_x = WORK_REGISTER_NUM_X;
1074                 reg_addr->reg_num_y = WORK_REGISTER_NUM_Y;
1075                 break;
1076
1077         case EDT_M09:
1078         case EDT_M12:
1079                 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
1080                 reg_addr->reg_report_rate = NO_REGISTER;
1081                 reg_addr->reg_gain = M09_REGISTER_GAIN;
1082                 reg_addr->reg_offset = M09_REGISTER_OFFSET;
1083                 reg_addr->reg_offset_x = NO_REGISTER;
1084                 reg_addr->reg_offset_y = NO_REGISTER;
1085                 reg_addr->reg_num_x = M09_REGISTER_NUM_X;
1086                 reg_addr->reg_num_y = M09_REGISTER_NUM_Y;
1087                 break;
1088
1089         case EV_FT:
1090                 reg_addr->reg_threshold = EV_REGISTER_THRESHOLD;
1091                 reg_addr->reg_report_rate = NO_REGISTER;
1092                 reg_addr->reg_gain = EV_REGISTER_GAIN;
1093                 reg_addr->reg_offset = NO_REGISTER;
1094                 reg_addr->reg_offset_x = EV_REGISTER_OFFSET_X;
1095                 reg_addr->reg_offset_y = EV_REGISTER_OFFSET_Y;
1096                 reg_addr->reg_num_x = NO_REGISTER;
1097                 reg_addr->reg_num_y = NO_REGISTER;
1098                 break;
1099
1100         case GENERIC_FT:
1101                 /* this is a guesswork */
1102                 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
1103                 reg_addr->reg_report_rate = NO_REGISTER;
1104                 reg_addr->reg_gain = M09_REGISTER_GAIN;
1105                 reg_addr->reg_offset = M09_REGISTER_OFFSET;
1106                 reg_addr->reg_offset_x = NO_REGISTER;
1107                 reg_addr->reg_offset_y = NO_REGISTER;
1108                 reg_addr->reg_num_x = NO_REGISTER;
1109                 reg_addr->reg_num_y = NO_REGISTER;
1110                 break;
1111         }
1112 }
1113
1114 static void edt_ft5x06_disable_regulators(void *arg)
1115 {
1116         struct edt_ft5x06_ts_data *data = arg;
1117
1118         regulator_disable(data->vcc);
1119         regulator_disable(data->iovcc);
1120 }
1121
1122 static int edt_ft5x06_ts_probe(struct i2c_client *client,
1123                                          const struct i2c_device_id *id)
1124 {
1125         const struct edt_i2c_chip_data *chip_data;
1126         struct edt_ft5x06_ts_data *tsdata;
1127         u8 buf[2] = { 0xfc, 0x00 };
1128         struct input_dev *input;
1129         unsigned long irq_flags;
1130         int error;
1131         char fw_version[EDT_NAME_LEN];
1132
1133         dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");
1134
1135         tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
1136         if (!tsdata) {
1137                 dev_err(&client->dev, "failed to allocate driver data.\n");
1138                 return -ENOMEM;
1139         }
1140
1141         chip_data = device_get_match_data(&client->dev);
1142         if (!chip_data)
1143                 chip_data = (const struct edt_i2c_chip_data *)id->driver_data;
1144         if (!chip_data || !chip_data->max_support_points) {
1145                 dev_err(&client->dev, "invalid or missing chip data\n");
1146                 return -EINVAL;
1147         }
1148
1149         tsdata->max_support_points = chip_data->max_support_points;
1150
1151         tsdata->vcc = devm_regulator_get(&client->dev, "vcc");
1152         if (IS_ERR(tsdata->vcc)) {
1153                 error = PTR_ERR(tsdata->vcc);
1154                 if (error != -EPROBE_DEFER)
1155                         dev_err(&client->dev,
1156                                 "failed to request regulator: %d\n", error);
1157                 return error;
1158         }
1159
1160         tsdata->iovcc = devm_regulator_get(&client->dev, "iovcc");
1161         if (IS_ERR(tsdata->iovcc)) {
1162                 error = PTR_ERR(tsdata->iovcc);
1163                 if (error != -EPROBE_DEFER)
1164                         dev_err(&client->dev,
1165                                 "failed to request iovcc regulator: %d\n", error);
1166                 return error;
1167         }
1168
1169         error = regulator_enable(tsdata->iovcc);
1170         if (error < 0) {
1171                 dev_err(&client->dev, "failed to enable iovcc: %d\n", error);
1172                 return error;
1173         }
1174
1175         /* Delay enabling VCC for > 10us (T_ivd) after IOVCC */
1176         usleep_range(10, 100);
1177
1178         error = regulator_enable(tsdata->vcc);
1179         if (error < 0) {
1180                 dev_err(&client->dev, "failed to enable vcc: %d\n", error);
1181                 regulator_disable(tsdata->iovcc);
1182                 return error;
1183         }
1184
1185         error = devm_add_action_or_reset(&client->dev,
1186                                          edt_ft5x06_disable_regulators,
1187                                          tsdata);
1188         if (error)
1189                 return error;
1190
1191         tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev,
1192                                                      "reset", GPIOD_OUT_HIGH);
1193         if (IS_ERR(tsdata->reset_gpio)) {
1194                 error = PTR_ERR(tsdata->reset_gpio);
1195                 dev_err(&client->dev,
1196                         "Failed to request GPIO reset pin, error %d\n", error);
1197                 return error;
1198         }
1199
1200         tsdata->wake_gpio = devm_gpiod_get_optional(&client->dev,
1201                                                     "wake", GPIOD_OUT_LOW);
1202         if (IS_ERR(tsdata->wake_gpio)) {
1203                 error = PTR_ERR(tsdata->wake_gpio);
1204                 dev_err(&client->dev,
1205                         "Failed to request GPIO wake pin, error %d\n", error);
1206                 return error;
1207         }
1208
1209         /*
1210          * Check which sleep modes we can support. Power-off requieres the
1211          * reset-pin to ensure correct power-down/power-up behaviour. Start with
1212          * the EDT_PMODE_POWEROFF test since this is the deepest possible sleep
1213          * mode.
1214          */
1215         if (tsdata->reset_gpio)
1216                 tsdata->suspend_mode = EDT_PMODE_POWEROFF;
1217         else if (tsdata->wake_gpio)
1218                 tsdata->suspend_mode = EDT_PMODE_HIBERNATE;
1219         else
1220                 tsdata->suspend_mode = EDT_PMODE_NOT_SUPPORTED;
1221
1222         if (tsdata->wake_gpio) {
1223                 usleep_range(5000, 6000);
1224                 gpiod_set_value_cansleep(tsdata->wake_gpio, 1);
1225         }
1226
1227         if (tsdata->reset_gpio) {
1228                 usleep_range(5000, 6000);
1229                 gpiod_set_value_cansleep(tsdata->reset_gpio, 0);
1230                 msleep(300);
1231         }
1232
1233         input = devm_input_allocate_device(&client->dev);
1234         if (!input) {
1235                 dev_err(&client->dev, "failed to allocate input device.\n");
1236                 return -ENOMEM;
1237         }
1238
1239         mutex_init(&tsdata->mutex);
1240         tsdata->client = client;
1241         tsdata->input = input;
1242         tsdata->factory_mode = false;
1243
1244         error = edt_ft5x06_ts_identify(client, tsdata, fw_version);
1245         if (error) {
1246                 dev_err(&client->dev, "touchscreen probe failed\n");
1247                 return error;
1248         }
1249
1250         /*
1251          * Dummy read access. EP0700MLP1 returns bogus data on the first
1252          * register read access and ignores writes.
1253          */
1254         edt_ft5x06_ts_readwrite(tsdata->client, 2, buf, 2, buf);
1255
1256         edt_ft5x06_ts_set_regs(tsdata);
1257         edt_ft5x06_ts_get_defaults(&client->dev, tsdata);
1258         edt_ft5x06_ts_get_parameters(tsdata);
1259
1260         dev_dbg(&client->dev,
1261                 "Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
1262                 tsdata->name, fw_version, tsdata->num_x, tsdata->num_y);
1263
1264         input->name = tsdata->name;
1265         input->id.bustype = BUS_I2C;
1266         input->dev.parent = &client->dev;
1267
1268         input_set_abs_params(input, ABS_MT_POSITION_X,
1269                              0, tsdata->num_x * 64 - 1, 0, 0);
1270         input_set_abs_params(input, ABS_MT_POSITION_Y,
1271                              0, tsdata->num_y * 64 - 1, 0, 0);
1272
1273         touchscreen_parse_properties(input, true, &tsdata->prop);
1274
1275         error = input_mt_init_slots(input, tsdata->max_support_points,
1276                                 INPUT_MT_DIRECT);
1277         if (error) {
1278                 dev_err(&client->dev, "Unable to init MT slots.\n");
1279                 return error;
1280         }
1281
1282         i2c_set_clientdata(client, tsdata);
1283
1284         if (client->irq) {
1285                 irq_flags = irq_get_trigger_type(client->irq);
1286                 if (irq_flags == IRQF_TRIGGER_NONE)
1287                         irq_flags = IRQF_TRIGGER_FALLING;
1288                 irq_flags |= IRQF_ONESHOT;
1289
1290                 error = devm_request_threaded_irq(&client->dev, client->irq,
1291                                                   NULL, edt_ft5x06_ts_isr,
1292                                                   irq_flags, client->name,
1293                                                   tsdata);
1294                 if (error) {
1295                         dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
1296                         return error;
1297                 }
1298         } else {
1299                 INIT_WORK(&tsdata->work_i2c_poll,
1300                           edt_ft5x06_ts_work_i2c_poll);
1301                 timer_setup(&tsdata->timer, edt_ft5x06_ts_irq_poll_timer, 0);
1302                 tsdata->timer.expires = jiffies +
1303                                         msecs_to_jiffies(POLL_INTERVAL_MS);
1304                 add_timer(&tsdata->timer);
1305         }
1306
1307         error = devm_device_add_group(&client->dev, &edt_ft5x06_attr_group);
1308         if (error)
1309                 return error;
1310
1311         error = input_register_device(input);
1312         if (error)
1313                 return error;
1314
1315         edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
1316
1317         dev_dbg(&client->dev,
1318                 "EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n",
1319                 client->irq,
1320                 tsdata->wake_gpio ? desc_to_gpio(tsdata->wake_gpio) : -1,
1321                 tsdata->reset_gpio ? desc_to_gpio(tsdata->reset_gpio) : -1);
1322
1323         return 0;
1324 }
1325
1326 static int edt_ft5x06_ts_remove(struct i2c_client *client)
1327 {
1328         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1329
1330         if (!client->irq) {
1331                 del_timer(&tsdata->timer);
1332                 cancel_work_sync(&tsdata->work_i2c_poll);
1333         }
1334         edt_ft5x06_ts_teardown_debugfs(tsdata);
1335
1336         return 0;
1337 }
1338
1339 static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev)
1340 {
1341         struct i2c_client *client = to_i2c_client(dev);
1342         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1343         struct gpio_desc *reset_gpio = tsdata->reset_gpio;
1344         int ret;
1345
1346         if (device_may_wakeup(dev))
1347                 return 0;
1348
1349         if (tsdata->suspend_mode == EDT_PMODE_NOT_SUPPORTED)
1350                 return 0;
1351
1352         /* Enter hibernate mode. */
1353         ret = edt_ft5x06_register_write(tsdata, PMOD_REGISTER_OPMODE,
1354                                         PMOD_REGISTER_HIBERNATE);
1355         if (ret)
1356                 dev_warn(dev, "Failed to set hibernate mode\n");
1357
1358         if (tsdata->suspend_mode == EDT_PMODE_HIBERNATE)
1359                 return 0;
1360
1361         /*
1362          * Power-off according the datasheet. Cut the power may leaf the irq
1363          * line in an undefined state depending on the host pull resistor
1364          * settings. Disable the irq to avoid adjusting each host till the
1365          * device is back in a full functional state.
1366          */
1367         disable_irq(tsdata->client->irq);
1368
1369         gpiod_set_value_cansleep(reset_gpio, 1);
1370         usleep_range(1000, 2000);
1371
1372         ret = regulator_disable(tsdata->vcc);
1373         if (ret)
1374                 dev_warn(dev, "Failed to disable vcc\n");
1375         ret = regulator_disable(tsdata->iovcc);
1376         if (ret)
1377                 dev_warn(dev, "Failed to disable iovcc\n");
1378
1379         return 0;
1380 }
1381
1382 static int __maybe_unused edt_ft5x06_ts_resume(struct device *dev)
1383 {
1384         struct i2c_client *client = to_i2c_client(dev);
1385         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1386         int ret = 0;
1387
1388         if (device_may_wakeup(dev))
1389                 return 0;
1390
1391         if (tsdata->suspend_mode == EDT_PMODE_NOT_SUPPORTED)
1392                 return 0;
1393
1394         if (tsdata->suspend_mode == EDT_PMODE_POWEROFF) {
1395                 struct gpio_desc *reset_gpio = tsdata->reset_gpio;
1396
1397                 /*
1398                  * We can't check if the regulator is a dummy or a real
1399                  * regulator. So we need to specify the 5ms reset time (T_rst)
1400                  * here instead of the 100us T_rtp time. We also need to wait
1401                  * 300ms in case it was a real supply and the power was cutted
1402                  * of. Toggle the reset pin is also a way to exit the hibernate
1403                  * mode.
1404                  */
1405                 gpiod_set_value_cansleep(reset_gpio, 1);
1406                 usleep_range(5000, 6000);
1407
1408                 ret = regulator_enable(tsdata->iovcc);
1409                 if (ret) {
1410                         dev_err(dev, "Failed to enable iovcc\n");
1411                         return ret;
1412                 }
1413
1414                 /* Delay enabling VCC for > 10us (T_ivd) after IOVCC */
1415                 usleep_range(10, 100);
1416
1417                 ret = regulator_enable(tsdata->vcc);
1418                 if (ret) {
1419                         dev_err(dev, "Failed to enable vcc\n");
1420                         regulator_disable(tsdata->iovcc);
1421                         return ret;
1422                 }
1423
1424                 usleep_range(1000, 2000);
1425                 gpiod_set_value_cansleep(reset_gpio, 0);
1426                 msleep(300);
1427
1428                 edt_ft5x06_restore_reg_parameters(tsdata);
1429                 enable_irq(tsdata->client->irq);
1430
1431                 if (tsdata->factory_mode)
1432                         ret = edt_ft5x06_factory_mode(tsdata);
1433         } else {
1434                 struct gpio_desc *wake_gpio = tsdata->wake_gpio;
1435
1436                 gpiod_set_value_cansleep(wake_gpio, 0);
1437                 usleep_range(5000, 6000);
1438                 gpiod_set_value_cansleep(wake_gpio, 1);
1439         }
1440
1441
1442         return ret;
1443 }
1444
1445 static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
1446                          edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);
1447
1448 static const struct edt_i2c_chip_data edt_ft5x06_data = {
1449         .max_support_points = 5,
1450 };
1451
1452 static const struct edt_i2c_chip_data edt_ft5506_data = {
1453         .max_support_points = 10,
1454 };
1455
1456 static const struct edt_i2c_chip_data edt_ft6236_data = {
1457         .max_support_points = 2,
1458 };
1459
1460 static const struct i2c_device_id edt_ft5x06_ts_id[] = {
1461         { .name = "edt-ft5x06", .driver_data = (long)&edt_ft5x06_data },
1462         { .name = "edt-ft5506", .driver_data = (long)&edt_ft5506_data },
1463         { .name = "ev-ft5726", .driver_data = (long)&edt_ft5506_data },
1464         /* Note no edt- prefix for compatibility with the ft6236.c driver */
1465         { .name = "ft6236", .driver_data = (long)&edt_ft6236_data },
1466         { /* sentinel */ }
1467 };
1468 MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
1469
1470 static const struct of_device_id edt_ft5x06_of_match[] = {
1471         { .compatible = "edt,edt-ft5206", .data = &edt_ft5x06_data },
1472         { .compatible = "edt,edt-ft5306", .data = &edt_ft5x06_data },
1473         { .compatible = "edt,edt-ft5406", .data = &edt_ft5x06_data },
1474         { .compatible = "edt,edt-ft5506", .data = &edt_ft5506_data },
1475         { .compatible = "evervision,ev-ft5726", .data = &edt_ft5506_data },
1476         /* Note focaltech vendor prefix for compatibility with ft6236.c */
1477         { .compatible = "focaltech,ft6236", .data = &edt_ft6236_data },
1478         { /* sentinel */ }
1479 };
1480 MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match);
1481
1482 static struct i2c_driver edt_ft5x06_ts_driver = {
1483         .driver = {
1484                 .name = "edt_ft5x06",
1485                 .of_match_table = edt_ft5x06_of_match,
1486                 .pm = &edt_ft5x06_ts_pm_ops,
1487                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1488         },
1489         .id_table = edt_ft5x06_ts_id,
1490         .probe    = edt_ft5x06_ts_probe,
1491         .remove   = edt_ft5x06_ts_remove,
1492 };
1493
1494 module_i2c_driver(edt_ft5x06_ts_driver);
1495
1496 MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>");
1497 MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
1498 MODULE_LICENSE("GPL v2");