drivers/input/touchscreen/edt-ft5x06.c

   1 /*
   2  * Copyright (C) 2012 Simon Budig, <simon.budig@kernelconcepts.de>
   3  * Daniel Wagener <daniel.wagener@kernelconcepts.de> (M09 firmware support)
   4  * Lothar Waßmann <LW@KARO-electronics.de> (DT support)
   5  *
   6  * This software is licensed under the terms of the GNU General Public
   7  * License version 2, as published by the Free Software Foundation, and
   8  * may be copied, distributed, and modified under those terms.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 /*
  21  * This is a driver for the EDT "Polytouch" family of touch controllers
  22  * based on the FocalTech FT5x06 line of chips.
  23  *
  24  * Development of this driver has been sponsored by Glyn:
  25  *    http://www.glyn.com/Products/Displays
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/ratelimit.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/input.h>
  32 #include <linux/i2c.h>
  33 #include <linux/uaccess.h>
  34 #include <linux/delay.h>
  35 #include <linux/debugfs.h>
  36 #include <linux/slab.h>
  37 #include <linux/gpio.h>
  38 #include <linux/of_gpio.h>
  39 #include <linux/input/mt.h>
  40 #include <linux/input/touchscreen.h>
  41 #include <linux/input/edt-ft5x06.h>
  42
  43 #define MAX_SUPPORT_POINTS              5
  44
  45 #define WORK_REGISTER_THRESHOLD         0x00
  46 #define WORK_REGISTER_REPORT_RATE       0x08
  47 #define WORK_REGISTER_GAIN              0x30
  48 #define WORK_REGISTER_OFFSET            0x31
  49 #define WORK_REGISTER_NUM_X             0x33
  50 #define WORK_REGISTER_NUM_Y             0x34
  51
  52 #define M09_REGISTER_THRESHOLD          0x80
  53 #define M09_REGISTER_GAIN               0x92
  54 #define M09_REGISTER_OFFSET             0x93
  55 #define M09_REGISTER_NUM_X              0x94
  56 #define M09_REGISTER_NUM_Y              0x95
  57
  58 #define NO_REGISTER                     0xff
  59
  60 #define WORK_REGISTER_OPMODE            0x3c
  61 #define FACTORY_REGISTER_OPMODE         0x01
  62
  63 #define TOUCH_EVENT_DOWN                0x00
  64 #define TOUCH_EVENT_UP                  0x01
  65 #define TOUCH_EVENT_ON                  0x02
  66 #define TOUCH_EVENT_RESERVED            0x03
  67
  68 #define EDT_NAME_LEN                    23
  69 #define EDT_SWITCH_MODE_RETRIES         10
  70 #define EDT_SWITCH_MODE_DELAY           5 /* msec */
  71 #define EDT_RAW_DATA_RETRIES            100
  72 #define EDT_RAW_DATA_DELAY              1 /* msec */
  73
  74 enum edt_ver {
  75         M06,
  76         M09,
  77 };
  78
  79 struct edt_reg_addr {
  80         int reg_threshold;
  81         int reg_report_rate;
  82         int reg_gain;
  83         int reg_offset;
  84         int reg_num_x;
  85         int reg_num_y;
  86 };
  87
  88 struct edt_ft5x06_ts_data {
  89         struct i2c_client *client;
  90         struct input_dev *input;
  91         u16 num_x;
  92         u16 num_y;
  93
  94         int reset_pin;
  95         int irq_pin;
  96         int wake_pin;
  97
  98 #if defined(CONFIG_DEBUG_FS)
  99         struct dentry *debug_dir;
 100         u8 *raw_buffer;
 101         size_t raw_bufsize;
 102 #endif
 103
 104         struct mutex mutex;
 105         bool factory_mode;
 106         int threshold;
 107         int gain;
 108         int offset;
 109         int report_rate;
 110
 111         char name[EDT_NAME_LEN];
 112
 113         struct edt_reg_addr reg_addr;
 114         enum edt_ver version;
 115 };
 116
 117 static int edt_ft5x06_ts_readwrite(struct i2c_client *client,
 118                                    u16 wr_len, u8 *wr_buf,
 119                                    u16 rd_len, u8 *rd_buf)
 120 {
 121         struct i2c_msg wrmsg[2];
 122         int i = 0;
 123         int ret;
 124
 125         if (wr_len) {
 126                 wrmsg[i].addr  = client->addr;
 127                 wrmsg[i].flags = 0;
 128                 wrmsg[i].len = wr_len;
 129                 wrmsg[i].buf = wr_buf;
 130                 i++;
 131         }
 132         if (rd_len) {
 133                 wrmsg[i].addr  = client->addr;
 134                 wrmsg[i].flags = I2C_M_RD;
 135                 wrmsg[i].len = rd_len;
 136                 wrmsg[i].buf = rd_buf;
 137                 i++;
 138         }
 139
 140         ret = i2c_transfer(client->adapter, wrmsg, i);
 141         if (ret < 0)
 142                 return ret;
 143         if (ret != i)
 144                 return -EIO;
 145
 146         return 0;
 147 }
 148
 149 static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata,
 150                                     u8 *buf, int buflen)
 151 {
 152         int i;
 153         u8 crc = 0;
 154
 155         for (i = 0; i < buflen - 1; i++)
 156                 crc ^= buf[i];
 157
 158         if (crc != buf[buflen-1]) {
 159                 dev_err_ratelimited(&tsdata->client->dev,
 160                                     "crc error: 0x%02x expected, got 0x%02x\n",
 161                                     crc, buf[buflen-1]);
 162                 return false;
 163         }
 164
 165         return true;
 166 }
 167
 168 static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
 169 {
 170         struct edt_ft5x06_ts_data *tsdata = dev_id;
 171         struct device *dev = &tsdata->client->dev;
 172         u8 cmd;
 173         u8 rdbuf[29];
 174         int i, type, x, y, id;
 175         int offset, tplen, datalen;
 176         int error;
 177
 178         switch (tsdata->version) {
 179         case M06:
 180                 cmd = 0xf9; /* tell the controller to send touch data */
 181                 offset = 5; /* where the actual touch data starts */
 182                 tplen = 4;  /* data comes in so called frames */
 183                 datalen = 26; /* how much bytes to listen for */
 184                 break;
 185
 186         case M09:
 187                 cmd = 0x02;
 188                 offset = 1;
 189                 tplen = 6;
 190                 datalen = 29;
 191                 break;
 192
 193         default:
 194                 goto out;
 195         }
 196
 197         memset(rdbuf, 0, sizeof(rdbuf));
 198
 199         error = edt_ft5x06_ts_readwrite(tsdata->client,
 200                                         sizeof(cmd), &cmd,
 201                                         datalen, rdbuf);
 202         if (error) {
 203                 dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
 204                                     error);
 205                 goto out;
 206         }
 207
 208         /* M09 does not send header or CRC */
 209         if (tsdata->version == M06) {
 210                 if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa ||
 211                         rdbuf[2] != datalen) {
 212                         dev_err_ratelimited(dev,
 213                                         "Unexpected header: %02x%02x%02x!\n",
 214                                         rdbuf[0], rdbuf[1], rdbuf[2]);
 215                         goto out;
 216                 }
 217
 218                 if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, datalen))
 219                         goto out;
 220         }
 221
 222         for (i = 0; i < MAX_SUPPORT_POINTS; i++) {
 223                 u8 *buf = &rdbuf[i * tplen + offset];
 224                 bool down;
 225
 226                 type = buf[0] >> 6;
 227                 /* ignore Reserved events */
 228                 if (type == TOUCH_EVENT_RESERVED)
 229                         continue;
 230
 231                 /* M06 sometimes sends bogus coordinates in TOUCH_DOWN */
 232                 if (tsdata->version == M06 && type == TOUCH_EVENT_DOWN)
 233                         continue;
 234
 235                 x = ((buf[0] << 8) | buf[1]) & 0x0fff;
 236                 y = ((buf[2] << 8) | buf[3]) & 0x0fff;
 237                 id = (buf[2] >> 4) & 0x0f;
 238                 down = type != TOUCH_EVENT_UP;
 239
 240                 input_mt_slot(tsdata->input, id);
 241                 input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER, down);
 242
 243                 if (!down)
 244                         continue;
 245
 246                 input_report_abs(tsdata->input, ABS_MT_POSITION_X, x);
 247                 input_report_abs(tsdata->input, ABS_MT_POSITION_Y, y);
 248         }
 249
 250         input_mt_report_pointer_emulation(tsdata->input, true);
 251         input_sync(tsdata->input);
 252
 253 out:
 254         return IRQ_HANDLED;
 255 }
 256
 257 static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
 258                                      u8 addr, u8 value)
 259 {
 260         u8 wrbuf[4];
 261
 262         switch (tsdata->version) {
 263         case M06:
 264                 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
 265                 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
 266                 wrbuf[2] = value;
 267                 wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2];
 268                 return edt_ft5x06_ts_readwrite(tsdata->client, 4,
 269                                         wrbuf, 0, NULL);
 270         case M09:
 271                 wrbuf[0] = addr;
 272                 wrbuf[1] = value;
 273
 274                 return edt_ft5x06_ts_readwrite(tsdata->client, 2,
 275                                         wrbuf, 0, NULL);
 276
 277         default:
 278                 return -EINVAL;
 279         }
 280 }
 281
 282 static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
 283                                     u8 addr)
 284 {
 285         u8 wrbuf[2], rdbuf[2];
 286         int error;
 287
 288         switch (tsdata->version) {
 289         case M06:
 290                 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
 291                 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
 292                 wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
 293
 294                 error = edt_ft5x06_ts_readwrite(tsdata->client, 2, wrbuf, 2,
 295                                                 rdbuf);
 296                 if (error)
 297                         return error;
 298
 299                 if ((wrbuf[0] ^ wrbuf[1] ^ rdbuf[0]) != rdbuf[1]) {
 300                         dev_err(&tsdata->client->dev,
 301                                 "crc error: 0x%02x expected, got 0x%02x\n",
 302                                 wrbuf[0] ^ wrbuf[1] ^ rdbuf[0],
 303                                 rdbuf[1]);
 304                         return -EIO;
 305                 }
 306                 break;
 307
 308         case M09:
 309                 wrbuf[0] = addr;
 310                 error = edt_ft5x06_ts_readwrite(tsdata->client, 1,
 311                                                 wrbuf, 1, rdbuf);
 312                 if (error)
 313                         return error;
 314                 break;
 315
 316         default:
 317                 return -EINVAL;
 318         }
 319
 320         return rdbuf[0];
 321 }
 322
 323 struct edt_ft5x06_attribute {
 324         struct device_attribute dattr;
 325         size_t field_offset;
 326         u8 limit_low;
 327         u8 limit_high;
 328         u8 addr_m06;
 329         u8 addr_m09;
 330 };
 331
 332 #define EDT_ATTR(_field, _mode, _addr_m06, _addr_m09,                   \
 333                 _limit_low, _limit_high)                                \
 334         struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = {        \
 335                 .dattr = __ATTR(_field, _mode,                          \
 336                                 edt_ft5x06_setting_show,                \
 337                                 edt_ft5x06_setting_store),              \
 338                 .field_offset = offsetof(struct edt_ft5x06_ts_data, _field), \
 339                 .addr_m06 = _addr_m06,                                  \
 340                 .addr_m09 = _addr_m09,                                  \
 341                 .limit_low = _limit_low,                                \
 342                 .limit_high = _limit_high,                              \
 343         }
 344
 345 static ssize_t edt_ft5x06_setting_show(struct device *dev,
 346                                        struct device_attribute *dattr,
 347                                        char *buf)
 348 {
 349         struct i2c_client *client = to_i2c_client(dev);
 350         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
 351         struct edt_ft5x06_attribute *attr =
 352                         container_of(dattr, struct edt_ft5x06_attribute, dattr);
 353         u8 *field = (u8 *)tsdata + attr->field_offset;
 354         int val;
 355         size_t count = 0;
 356         int error = 0;
 357         u8 addr;
 358
 359         mutex_lock(&tsdata->mutex);
 360
 361         if (tsdata->factory_mode) {
 362                 error = -EIO;
 363                 goto out;
 364         }
 365
 366         switch (tsdata->version) {
 367         case M06:
 368                 addr = attr->addr_m06;
 369                 break;
 370
 371         case M09:
 372                 addr = attr->addr_m09;
 373                 break;
 374
 375         default:
 376                 error = -ENODEV;
 377                 goto out;
 378         }
 379
 380         if (addr != NO_REGISTER) {
 381                 val = edt_ft5x06_register_read(tsdata, addr);
 382                 if (val < 0) {
 383                         error = val;
 384                         dev_err(&tsdata->client->dev,
 385                                 "Failed to fetch attribute %s, error %d\n",
 386                                 dattr->attr.name, error);
 387                         goto out;
 388                 }
 389         } else {
 390                 val = *field;
 391         }
 392
 393         if (val != *field) {
 394                 dev_warn(&tsdata->client->dev,
 395                          "%s: read (%d) and stored value (%d) differ\n",
 396                          dattr->attr.name, val, *field);
 397                 *field = val;
 398         }
 399
 400         count = scnprintf(buf, PAGE_SIZE, "%d\n", val);
 401 out:
 402         mutex_unlock(&tsdata->mutex);
 403         return error ?: count;
 404 }
 405
 406 static ssize_t edt_ft5x06_setting_store(struct device *dev,
 407                                         struct device_attribute *dattr,
 408                                         const char *buf, size_t count)
 409 {
 410         struct i2c_client *client = to_i2c_client(dev);
 411         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
 412         struct edt_ft5x06_attribute *attr =
 413                         container_of(dattr, struct edt_ft5x06_attribute, dattr);
 414         u8 *field = (u8 *)tsdata + attr->field_offset;
 415         unsigned int val;
 416         int error;
 417         u8 addr;
 418
 419         mutex_lock(&tsdata->mutex);
 420
 421         if (tsdata->factory_mode) {
 422                 error = -EIO;
 423                 goto out;
 424         }
 425
 426         error = kstrtouint(buf, 0, &val);
 427         if (error)
 428                 goto out;
 429
 430         if (val < attr->limit_low || val > attr->limit_high) {
 431                 error = -ERANGE;
 432                 goto out;
 433         }
 434
 435         switch (tsdata->version) {
 436         case M06:
 437                 addr = attr->addr_m06;
 438                 break;
 439
 440         case M09:
 441                 addr = attr->addr_m09;
 442                 break;
 443
 444         default:
 445                 error = -ENODEV;
 446                 goto out;
 447         }
 448
 449         if (addr != NO_REGISTER) {
 450                 error = edt_ft5x06_register_write(tsdata, addr, val);
 451                 if (error) {
 452                         dev_err(&tsdata->client->dev,
 453                                 "Failed to update attribute %s, error: %d\n",
 454                                 dattr->attr.name, error);
 455                         goto out;
 456                 }
 457         }
 458         *field = val;
 459
 460 out:
 461         mutex_unlock(&tsdata->mutex);
 462         return error ?: count;
 463 }
 464
 465 static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN,
 466                 M09_REGISTER_GAIN, 0, 31);
 467 static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET,
 468                 M09_REGISTER_OFFSET, 0, 31);
 469 static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD,
 470                 M09_REGISTER_THRESHOLD, 20, 80);
 471 static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE,
 472                 NO_REGISTER, 3, 14);
 473
 474 static struct attribute *edt_ft5x06_attrs[] = {
 475         &edt_ft5x06_attr_gain.dattr.attr,
 476         &edt_ft5x06_attr_offset.dattr.attr,
 477         &edt_ft5x06_attr_threshold.dattr.attr,
 478         &edt_ft5x06_attr_report_rate.dattr.attr,
 479         NULL
 480 };
 481
 482 static const struct attribute_group edt_ft5x06_attr_group = {
 483         .attrs = edt_ft5x06_attrs,
 484 };
 485
 486 #ifdef CONFIG_DEBUG_FS
 487 static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
 488 {
 489         struct i2c_client *client = tsdata->client;
 490         int retries = EDT_SWITCH_MODE_RETRIES;
 491         int ret;
 492         int error;
 493
 494         disable_irq(client->irq);
 495
 496         if (!tsdata->raw_buffer) {
 497                 tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y *
 498                                       sizeof(u16);
 499                 tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
 500                 if (!tsdata->raw_buffer) {
 501                         error = -ENOMEM;
 502                         goto err_out;
 503                 }
 504         }
 505
 506         /* mode register is 0x3c when in the work mode */
 507         if (tsdata->version == M09)
 508                 goto m09_out;
 509
 510         error = edt_ft5x06_register_write(tsdata, WORK_REGISTER_OPMODE, 0x03);
 511         if (error) {
 512                 dev_err(&client->dev,
 513                         "failed to switch to factory mode, error %d\n", error);
 514                 goto err_out;
 515         }
 516
 517         tsdata->factory_mode = true;
 518         do {
 519                 mdelay(EDT_SWITCH_MODE_DELAY);
 520                 /* mode register is 0x01 when in factory mode */
 521                 ret = edt_ft5x06_register_read(tsdata, FACTORY_REGISTER_OPMODE);
 522                 if (ret == 0x03)
 523                         break;
 524         } while (--retries > 0);
 525
 526         if (retries == 0) {
 527                 dev_err(&client->dev, "not in factory mode after %dms.\n",
 528                         EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
 529                 error = -EIO;
 530                 goto err_out;
 531         }
 532
 533         return 0;
 534
 535 err_out:
 536         kfree(tsdata->raw_buffer);
 537         tsdata->raw_buffer = NULL;
 538         tsdata->factory_mode = false;
 539         enable_irq(client->irq);
 540
 541         return error;
 542
 543 m09_out:
 544         dev_err(&client->dev, "No factory mode support for M09\n");
 545         return -EINVAL;
 546
 547 }
 548
 549 static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
 550 {
 551         struct i2c_client *client = tsdata->client;
 552         int retries = EDT_SWITCH_MODE_RETRIES;
 553         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 554         int ret;
 555         int error;
 556
 557         /* mode register is 0x01 when in the factory mode */
 558         error = edt_ft5x06_register_write(tsdata, FACTORY_REGISTER_OPMODE, 0x1);
 559         if (error) {
 560                 dev_err(&client->dev,
 561                         "failed to switch to work mode, error: %d\n", error);
 562                 return error;
 563         }
 564
 565         tsdata->factory_mode = false;
 566
 567         do {
 568                 mdelay(EDT_SWITCH_MODE_DELAY);
 569                 /* mode register is 0x01 when in factory mode */
 570                 ret = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OPMODE);
 571                 if (ret == 0x01)
 572                         break;
 573         } while (--retries > 0);
 574
 575         if (retries == 0) {
 576                 dev_err(&client->dev, "not in work mode after %dms.\n",
 577                         EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
 578                 tsdata->factory_mode = true;
 579                 return -EIO;
 580         }
 581
 582         kfree(tsdata->raw_buffer);
 583         tsdata->raw_buffer = NULL;
 584
 585         /* restore parameters */
 586         edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold,
 587                                   tsdata->threshold);
 588         edt_ft5x06_register_write(tsdata, reg_addr->reg_gain,
 589                                   tsdata->gain);
 590         edt_ft5x06_register_write(tsdata, reg_addr->reg_offset,
 591                                   tsdata->offset);
 592         if (reg_addr->reg_report_rate)
 593                 edt_ft5x06_register_write(tsdata, reg_addr->reg_report_rate,
 594                                   tsdata->report_rate);
 595
 596         enable_irq(client->irq);
 597
 598         return 0;
 599 }
 600
 601 static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
 602 {
 603         struct edt_ft5x06_ts_data *tsdata = data;
 604
 605         *mode = tsdata->factory_mode;
 606
 607         return 0;
 608 };
 609
 610 static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode)
 611 {
 612         struct edt_ft5x06_ts_data *tsdata = data;
 613         int retval = 0;
 614
 615         if (mode > 1)
 616                 return -ERANGE;
 617
 618         mutex_lock(&tsdata->mutex);
 619
 620         if (mode != tsdata->factory_mode) {
 621                 retval = mode ? edt_ft5x06_factory_mode(tsdata) :
 622                                 edt_ft5x06_work_mode(tsdata);
 623         }
 624
 625         mutex_unlock(&tsdata->mutex);
 626
 627         return retval;
 628 };
 629
 630 DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get,
 631                         edt_ft5x06_debugfs_mode_set, "%llu\n");
 632
 633 static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
 634                                 char __user *buf, size_t count, loff_t *off)
 635 {
 636         struct edt_ft5x06_ts_data *tsdata = file->private_data;
 637         struct i2c_client *client = tsdata->client;
 638         int retries  = EDT_RAW_DATA_RETRIES;
 639         int val, i, error;
 640         size_t read = 0;
 641         int colbytes;
 642         char wrbuf[3];
 643         u8 *rdbuf;
 644
 645         if (*off < 0 || *off >= tsdata->raw_bufsize)
 646                 return 0;
 647
 648         mutex_lock(&tsdata->mutex);
 649
 650         if (!tsdata->factory_mode || !tsdata->raw_buffer) {
 651                 error = -EIO;
 652                 goto out;
 653         }
 654
 655         error = edt_ft5x06_register_write(tsdata, 0x08, 0x01);
 656         if (error) {
 657                 dev_dbg(&client->dev,
 658                         "failed to write 0x08 register, error %d\n", error);
 659                 goto out;
 660         }
 661
 662         do {
 663                 msleep(EDT_RAW_DATA_DELAY);
 664                 val = edt_ft5x06_register_read(tsdata, 0x08);
 665                 if (val < 1)
 666                         break;
 667         } while (--retries > 0);
 668
 669         if (val < 0) {
 670                 error = val;
 671                 dev_dbg(&client->dev,
 672                         "failed to read 0x08 register, error %d\n", error);
 673                 goto out;
 674         }
 675
 676         if (retries == 0) {
 677                 dev_dbg(&client->dev,
 678                         "timed out waiting for register to settle\n");
 679                 error = -ETIMEDOUT;
 680                 goto out;
 681         }
 682
 683         rdbuf = tsdata->raw_buffer;
 684         colbytes = tsdata->num_y * sizeof(u16);
 685
 686         wrbuf[0] = 0xf5;
 687         wrbuf[1] = 0x0e;
 688         for (i = 0; i < tsdata->num_x; i++) {
 689                 wrbuf[2] = i;  /* column index */
 690                 error = edt_ft5x06_ts_readwrite(tsdata->client,
 691                                                 sizeof(wrbuf), wrbuf,
 692                                                 colbytes, rdbuf);
 693                 if (error)
 694                         goto out;
 695
 696                 rdbuf += colbytes;
 697         }
 698
 699         read = min_t(size_t, count, tsdata->raw_bufsize - *off);
 700         if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) {
 701                 error = -EFAULT;
 702                 goto out;
 703         }
 704
 705         *off += read;
 706 out:
 707         mutex_unlock(&tsdata->mutex);
 708         return error ?: read;
 709 };
 710
 711 static const struct file_operations debugfs_raw_data_fops = {
 712         .open = simple_open,
 713         .read = edt_ft5x06_debugfs_raw_data_read,
 714 };
 715
 716 static void
 717 edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
 718                               const char *debugfs_name)
 719 {
 720         tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
 721         if (!tsdata->debug_dir)
 722                 return;
 723
 724         debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x);
 725         debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y);
 726
 727         debugfs_create_file("mode", S_IRUSR | S_IWUSR,
 728                             tsdata->debug_dir, tsdata, &debugfs_mode_fops);
 729         debugfs_create_file("raw_data", S_IRUSR,
 730                             tsdata->debug_dir, tsdata, &debugfs_raw_data_fops);
 731 }
 732
 733 static void
 734 edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
 735 {
 736         debugfs_remove_recursive(tsdata->debug_dir);
 737         kfree(tsdata->raw_buffer);
 738 }
 739
 740 #else
 741
 742 static inline void
 743 edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
 744                               const char *debugfs_name)
 745 {
 746 }
 747
 748 static inline void
 749 edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
 750 {
 751 }
 752
 753 #endif /* CONFIG_DEBUGFS */
 754
 755 static int edt_ft5x06_ts_reset(struct i2c_client *client,
 756                         struct edt_ft5x06_ts_data *tsdata)
 757 {
 758         int error;
 759
 760         if (gpio_is_valid(tsdata->wake_pin)) {
 761                 error = devm_gpio_request_one(&client->dev,
 762                                         tsdata->wake_pin, GPIOF_OUT_INIT_LOW,
 763                                         "edt-ft5x06 wake");
 764                 if (error) {
 765                         dev_err(&client->dev,
 766                                 "Failed to request GPIO %d as wake pin, error %d\n",
 767                                 tsdata->wake_pin, error);
 768                         return error;
 769                 }
 770
 771                 msleep(5);
 772                 gpio_set_value(tsdata->wake_pin, 1);
 773         }
 774         if (gpio_is_valid(tsdata->reset_pin)) {
 775                 /* this pulls reset down, enabling the low active reset */
 776                 error = devm_gpio_request_one(&client->dev,
 777                                         tsdata->reset_pin, GPIOF_OUT_INIT_LOW,
 778                                         "edt-ft5x06 reset");
 779                 if (error) {
 780                         dev_err(&client->dev,
 781                                 "Failed to request GPIO %d as reset pin, error %d\n",
 782                                 tsdata->reset_pin, error);
 783                         return error;
 784                 }
 785
 786                 msleep(5);
 787                 gpio_set_value(tsdata->reset_pin, 1);
 788                 msleep(300);
 789         }
 790
 791         return 0;
 792 }
 793
 794 static int edt_ft5x06_ts_identify(struct i2c_client *client,
 795                                         struct edt_ft5x06_ts_data *tsdata,
 796                                         char *fw_version)
 797 {
 798         u8 rdbuf[EDT_NAME_LEN];
 799         char *p;
 800         int error;
 801         char *model_name = tsdata->name;
 802
 803         /* see what we find if we assume it is a M06 *
 804          * if we get less than EDT_NAME_LEN, we don't want
 805          * to have garbage in there
 806          */
 807         memset(rdbuf, 0, sizeof(rdbuf));
 808         error = edt_ft5x06_ts_readwrite(client, 1, "\xbb",
 809                                         EDT_NAME_LEN - 1, rdbuf);
 810         if (error)
 811                 return error;
 812
 813         /* if we find something consistent, stay with that assumption
 814          * at least M09 won't send 3 bytes here
 815          */
 816         if (!(strncasecmp(rdbuf + 1, "EP0", 3))) {
 817                 tsdata->version = M06;
 818
 819                 /* remove last '$' end marker */
 820                 rdbuf[EDT_NAME_LEN - 1] = '\0';
 821                 if (rdbuf[EDT_NAME_LEN - 2] == '$')
 822                         rdbuf[EDT_NAME_LEN - 2] = '\0';
 823
 824                 /* look for Model/Version separator */
 825                 p = strchr(rdbuf, '*');
 826                 if (p)
 827                         *p++ = '\0';
 828                 strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
 829                 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
 830         } else {
 831                 /* since there are only two versions around (M06, M09) */
 832                 tsdata->version = M09;
 833
 834                 error = edt_ft5x06_ts_readwrite(client, 1, "\xA6",
 835                                                 2, rdbuf);
 836                 if (error)
 837                         return error;
 838
 839                 strlcpy(fw_version, rdbuf, 2);
 840
 841                 error = edt_ft5x06_ts_readwrite(client, 1, "\xA8",
 842                                                 1, rdbuf);
 843                 if (error)
 844                         return error;
 845
 846                 snprintf(model_name, EDT_NAME_LEN, "EP0%i%i0M09",
 847                         rdbuf[0] >> 4, rdbuf[0] & 0x0F);
 848         }
 849
 850         return 0;
 851 }
 852
 853 #define EDT_ATTR_CHECKSET(name, reg) \
 854 do {                                                            \
 855         if (pdata->name >= edt_ft5x06_attr_##name.limit_low &&          \
 856             pdata->name <= edt_ft5x06_attr_##name.limit_high)           \
 857                 edt_ft5x06_register_write(tsdata, reg, pdata->name);    \
 858 } while (0)
 859
 860 #define EDT_GET_PROP(name, reg) {                               \
 861         u32 val;                                                \
 862         if (of_property_read_u32(np, #name, &val) == 0)         \
 863                 edt_ft5x06_register_write(tsdata, reg, val);    \
 864 }
 865
 866 static void edt_ft5x06_ts_get_dt_defaults(struct device_node *np,
 867                                         struct edt_ft5x06_ts_data *tsdata)
 868 {
 869         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 870
 871         EDT_GET_PROP(threshold, reg_addr->reg_threshold);
 872         EDT_GET_PROP(gain, reg_addr->reg_gain);
 873         EDT_GET_PROP(offset, reg_addr->reg_offset);
 874 }
 875
 876 static void
 877 edt_ft5x06_ts_get_defaults(struct edt_ft5x06_ts_data *tsdata,
 878                            const struct edt_ft5x06_platform_data *pdata)
 879 {
 880         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 881
 882         if (!pdata->use_parameters)
 883                 return;
 884
 885         /* pick up defaults from the platform data */
 886         EDT_ATTR_CHECKSET(threshold, reg_addr->reg_threshold);
 887         EDT_ATTR_CHECKSET(gain, reg_addr->reg_gain);
 888         EDT_ATTR_CHECKSET(offset, reg_addr->reg_offset);
 889         if (reg_addr->reg_report_rate != NO_REGISTER)
 890                 EDT_ATTR_CHECKSET(report_rate, reg_addr->reg_report_rate);
 891 }
 892
 893 static void
 894 edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
 895 {
 896         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 897
 898         tsdata->threshold = edt_ft5x06_register_read(tsdata,
 899                                                      reg_addr->reg_threshold);
 900         tsdata->gain = edt_ft5x06_register_read(tsdata, reg_addr->reg_gain);
 901         tsdata->offset = edt_ft5x06_register_read(tsdata, reg_addr->reg_offset);
 902         if (reg_addr->reg_report_rate != NO_REGISTER)
 903                 tsdata->report_rate = edt_ft5x06_register_read(tsdata,
 904                                                 reg_addr->reg_report_rate);
 905         tsdata->num_x = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_x);
 906         tsdata->num_y = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_y);
 907 }
 908
 909 static void
 910 edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
 911 {
 912         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 913
 914         switch (tsdata->version) {
 915         case M06:
 916                 reg_addr->reg_threshold = WORK_REGISTER_THRESHOLD;
 917                 reg_addr->reg_report_rate = WORK_REGISTER_REPORT_RATE;
 918                 reg_addr->reg_gain = WORK_REGISTER_GAIN;
 919                 reg_addr->reg_offset = WORK_REGISTER_OFFSET;
 920                 reg_addr->reg_num_x = WORK_REGISTER_NUM_X;
 921                 reg_addr->reg_num_y = WORK_REGISTER_NUM_Y;
 922                 break;
 923
 924         case M09:
 925                 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
 926                 reg_addr->reg_gain = M09_REGISTER_GAIN;
 927                 reg_addr->reg_offset = M09_REGISTER_OFFSET;
 928                 reg_addr->reg_num_x = M09_REGISTER_NUM_X;
 929                 reg_addr->reg_num_y = M09_REGISTER_NUM_Y;
 930                 break;
 931         }
 932 }
 933
 934 #ifdef CONFIG_OF
 935 static int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
 936                                 struct edt_ft5x06_ts_data *tsdata)
 937 {
 938         struct device_node *np = dev->of_node;
 939
 940         /*
 941          * irq_pin is not needed for DT setup.
 942          * irq is associated via 'interrupts' property in DT
 943          */
 944         tsdata->irq_pin = -EINVAL;
 945         tsdata->reset_pin = of_get_named_gpio(np, "reset-gpios", 0);
 946         tsdata->wake_pin = of_get_named_gpio(np, "wake-gpios", 0);
 947
 948         return 0;
 949 }
 950 #else
 951 static inline int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
 952                                         struct edt_ft5x06_ts_data *tsdata)
 953 {
 954         return -ENODEV;
 955 }
 956 #endif
 957
 958 static int edt_ft5x06_ts_probe(struct i2c_client *client,
 959                                          const struct i2c_device_id *id)
 960 {
 961         const struct edt_ft5x06_platform_data *pdata =
 962                                                 dev_get_platdata(&client->dev);
 963         struct edt_ft5x06_ts_data *tsdata;
 964         struct input_dev *input;
 965         int error;
 966         char fw_version[EDT_NAME_LEN];
 967
 968         dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");
 969
 970         tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
 971         if (!tsdata) {
 972                 dev_err(&client->dev, "failed to allocate driver data.\n");
 973                 return -ENOMEM;
 974         }
 975
 976         if (!pdata) {
 977                 error = edt_ft5x06_i2c_ts_probe_dt(&client->dev, tsdata);
 978                 if (error) {
 979                         dev_err(&client->dev,
 980                                 "DT probe failed and no platform data present\n");
 981                         return error;
 982                 }
 983         } else {
 984                 tsdata->reset_pin = pdata->reset_pin;
 985                 tsdata->irq_pin = pdata->irq_pin;
 986                 tsdata->wake_pin = -EINVAL;
 987         }
 988
 989         error = edt_ft5x06_ts_reset(client, tsdata);
 990         if (error)
 991                 return error;
 992
 993         if (gpio_is_valid(tsdata->irq_pin)) {
 994                 error = devm_gpio_request_one(&client->dev, tsdata->irq_pin,
 995                                         GPIOF_IN, "edt-ft5x06 irq");
 996                 if (error) {
 997                         dev_err(&client->dev,
 998                                 "Failed to request GPIO %d, error %d\n",
 999                                 tsdata->irq_pin, error);
1000                         return error;
1001                 }
1002         }
1003
1004         input = devm_input_allocate_device(&client->dev);
1005         if (!input) {
1006                 dev_err(&client->dev, "failed to allocate input device.\n");
1007                 return -ENOMEM;
1008         }
1009
1010         mutex_init(&tsdata->mutex);
1011         tsdata->client = client;
1012         tsdata->input = input;
1013         tsdata->factory_mode = false;
1014
1015         error = edt_ft5x06_ts_identify(client, tsdata, fw_version);
1016         if (error) {
1017                 dev_err(&client->dev, "touchscreen probe failed\n");
1018                 return error;
1019         }
1020
1021         edt_ft5x06_ts_set_regs(tsdata);
1022
1023         if (!pdata)
1024                 edt_ft5x06_ts_get_dt_defaults(client->dev.of_node, tsdata);
1025         else
1026                 edt_ft5x06_ts_get_defaults(tsdata, pdata);
1027
1028         edt_ft5x06_ts_get_parameters(tsdata);
1029
1030         dev_dbg(&client->dev,
1031                 "Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
1032                 tsdata->name, fw_version, tsdata->num_x, tsdata->num_y);
1033
1034         input->name = tsdata->name;
1035         input->id.bustype = BUS_I2C;
1036         input->dev.parent = &client->dev;
1037
1038         input_set_abs_params(input, ABS_MT_POSITION_X,
1039                              0, tsdata->num_x * 64 - 1, 0, 0);
1040         input_set_abs_params(input, ABS_MT_POSITION_Y,
1041                              0, tsdata->num_y * 64 - 1, 0, 0);
1042
1043         if (!pdata)
1044                 touchscreen_parse_properties(input, true);
1045
1046         error = input_mt_init_slots(input, MAX_SUPPORT_POINTS, INPUT_MT_DIRECT);
1047         if (error) {
1048                 dev_err(&client->dev, "Unable to init MT slots.\n");
1049                 return error;
1050         }
1051
1052         input_set_drvdata(input, tsdata);
1053         i2c_set_clientdata(client, tsdata);
1054
1055         error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
1056                                         edt_ft5x06_ts_isr,
1057                                         IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
1058                                         client->name, tsdata);
1059         if (error) {
1060                 dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
1061                 return error;
1062         }
1063
1064         error = sysfs_create_group(&client->dev.kobj, &edt_ft5x06_attr_group);
1065         if (error)
1066                 return error;
1067
1068         error = input_register_device(input);
1069         if (error)
1070                 goto err_remove_attrs;
1071
1072         edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
1073         device_init_wakeup(&client->dev, 1);
1074
1075         dev_dbg(&client->dev,
1076                 "EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n",
1077                 client->irq, tsdata->wake_pin, tsdata->reset_pin);
1078
1079         return 0;
1080
1081 err_remove_attrs:
1082         sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
1083         return error;
1084 }
1085
1086 static int edt_ft5x06_ts_remove(struct i2c_client *client)
1087 {
1088         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1089
1090         edt_ft5x06_ts_teardown_debugfs(tsdata);
1091         sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
1092
1093         return 0;
1094 }
1095
1096 static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev)
1097 {
1098         struct i2c_client *client = to_i2c_client(dev);
1099
1100         if (device_may_wakeup(dev))
1101                 enable_irq_wake(client->irq);
1102
1103         return 0;
1104 }
1105
1106 static int __maybe_unused edt_ft5x06_ts_resume(struct device *dev)
1107 {
1108         struct i2c_client *client = to_i2c_client(dev);
1109
1110         if (device_may_wakeup(dev))
1111                 disable_irq_wake(client->irq);
1112
1113         return 0;
1114 }
1115
1116 static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
1117                          edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);
1118
1119 static const struct i2c_device_id edt_ft5x06_ts_id[] = {
1120         { "edt-ft5x06", 0, },
1121         { /* sentinel */ }
1122 };
1123 MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
1124
1125 #ifdef CONFIG_OF
1126 static const struct of_device_id edt_ft5x06_of_match[] = {
1127         { .compatible = "edt,edt-ft5206", },
1128         { .compatible = "edt,edt-ft5306", },
1129         { .compatible = "edt,edt-ft5406", },
1130         { /* sentinel */ }
1131 };
1132 MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match);
1133 #endif
1134
1135 static struct i2c_driver edt_ft5x06_ts_driver = {
1136         .driver = {
1137                 .name = "edt_ft5x06",
1138                 .of_match_table = of_match_ptr(edt_ft5x06_of_match),
1139                 .pm = &edt_ft5x06_ts_pm_ops,
1140         },
1141         .id_table = edt_ft5x06_ts_id,
1142         .probe    = edt_ft5x06_ts_probe,
1143         .remove   = edt_ft5x06_ts_remove,
1144 };
1145
1146 module_i2c_driver(edt_ft5x06_ts_driver);
1147
1148 MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>");
1149 MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
1150 MODULE_LICENSE("GPL");