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/irq.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/input.h>
  33 #include <linux/i2c.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/delay.h>
  36 #include <linux/debugfs.h>
  37 #include <linux/slab.h>
  38 #include <linux/gpio/consumer.h>
  39 #include <linux/input/mt.h>
  40 #include <linux/input/touchscreen.h>
  41 #include <linux/of_device.h>
  42
  43 #define WORK_REGISTER_THRESHOLD         0x00
  44 #define WORK_REGISTER_REPORT_RATE       0x08
  45 #define WORK_REGISTER_GAIN              0x30
  46 #define WORK_REGISTER_OFFSET            0x31
  47 #define WORK_REGISTER_NUM_X             0x33
  48 #define WORK_REGISTER_NUM_Y             0x34
  49
  50 #define M09_REGISTER_THRESHOLD          0x80
  51 #define M09_REGISTER_GAIN               0x92
  52 #define M09_REGISTER_OFFSET             0x93
  53 #define M09_REGISTER_NUM_X              0x94
  54 #define M09_REGISTER_NUM_Y              0x95
  55
  56 #define NO_REGISTER                     0xff
  57
  58 #define WORK_REGISTER_OPMODE            0x3c
  59 #define FACTORY_REGISTER_OPMODE         0x01
  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              1 /* msec */
  71
  72 enum edt_ver {
  73         M06,
  74         M09,
  75 };
  76
  77 struct edt_reg_addr {
  78         int reg_threshold;
  79         int reg_report_rate;
  80         int reg_gain;
  81         int reg_offset;
  82         int reg_num_x;
  83         int reg_num_y;
  84 };
  85
  86 struct edt_ft5x06_ts_data {
  87         struct i2c_client *client;
  88         struct input_dev *input;
  89         u16 num_x;
  90         u16 num_y;
  91
  92         struct gpio_desc *reset_gpio;
  93         struct gpio_desc *wake_gpio;
  94
  95 #if defined(CONFIG_DEBUG_FS)
  96         struct dentry *debug_dir;
  97         u8 *raw_buffer;
  98         size_t raw_bufsize;
  99 #endif
 100
 101         struct mutex mutex;
 102         bool factory_mode;
 103         int threshold;
 104         int gain;
 105         int offset;
 106         int report_rate;
 107         int max_support_points;
 108
 109         char name[EDT_NAME_LEN];
 110
 111         struct edt_reg_addr reg_addr;
 112         enum edt_ver version;
 113 };
 114
 115 struct edt_i2c_chip_data {
 116         int  max_support_points;
 117 };
 118
 119 static int edt_ft5x06_ts_readwrite(struct i2c_client *client,
 120                                    u16 wr_len, u8 *wr_buf,
 121                                    u16 rd_len, u8 *rd_buf)
 122 {
 123         struct i2c_msg wrmsg[2];
 124         int i = 0;
 125         int ret;
 126
 127         if (wr_len) {
 128                 wrmsg[i].addr  = client->addr;
 129                 wrmsg[i].flags = 0;
 130                 wrmsg[i].len = wr_len;
 131                 wrmsg[i].buf = wr_buf;
 132                 i++;
 133         }
 134         if (rd_len) {
 135                 wrmsg[i].addr  = client->addr;
 136                 wrmsg[i].flags = I2C_M_RD;
 137                 wrmsg[i].len = rd_len;
 138                 wrmsg[i].buf = rd_buf;
 139                 i++;
 140         }
 141
 142         ret = i2c_transfer(client->adapter, wrmsg, i);
 143         if (ret < 0)
 144                 return ret;
 145         if (ret != i)
 146                 return -EIO;
 147
 148         return 0;
 149 }
 150
 151 static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata,
 152                                     u8 *buf, int buflen)
 153 {
 154         int i;
 155         u8 crc = 0;
 156
 157         for (i = 0; i < buflen - 1; i++)
 158                 crc ^= buf[i];
 159
 160         if (crc != buf[buflen-1]) {
 161                 dev_err_ratelimited(&tsdata->client->dev,
 162                                     "crc error: 0x%02x expected, got 0x%02x\n",
 163                                     crc, buf[buflen-1]);
 164                 return false;
 165         }
 166
 167         return true;
 168 }
 169
 170 static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
 171 {
 172         struct edt_ft5x06_ts_data *tsdata = dev_id;
 173         struct device *dev = &tsdata->client->dev;
 174         u8 cmd;
 175         u8 rdbuf[63];
 176         int i, type, x, y, id;
 177         int offset, tplen, datalen, crclen;
 178         int error;
 179
 180         switch (tsdata->version) {
 181         case M06:
 182                 cmd = 0xf9; /* tell the controller to send touch data */
 183                 offset = 5; /* where the actual touch data starts */
 184                 tplen = 4;  /* data comes in so called frames */
 185                 crclen = 1; /* length of the crc data */
 186                 break;
 187
 188         case M09:
 189                 cmd = 0x0;
 190                 offset = 3;
 191                 tplen = 6;
 192                 crclen = 0;
 193                 break;
 194
 195         default:
 196                 goto out;
 197         }
 198
 199         memset(rdbuf, 0, sizeof(rdbuf));
 200         datalen = tplen * tsdata->max_support_points + offset + crclen;
 201
 202         error = edt_ft5x06_ts_readwrite(tsdata->client,
 203                                         sizeof(cmd), &cmd,
 204                                         datalen, rdbuf);
 205         if (error) {
 206                 dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
 207                                     error);
 208                 goto out;
 209         }
 210
 211         /* M09 does not send header or CRC */
 212         if (tsdata->version == M06) {
 213                 if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa ||
 214                         rdbuf[2] != datalen) {
 215                         dev_err_ratelimited(dev,
 216                                         "Unexpected header: %02x%02x%02x!\n",
 217                                         rdbuf[0], rdbuf[1], rdbuf[2]);
 218                         goto out;
 219                 }
 220
 221                 if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, datalen))
 222                         goto out;
 223         }
 224
 225         for (i = 0; i < tsdata->max_support_points; i++) {
 226                 u8 *buf = &rdbuf[i * tplen + offset];
 227                 bool down;
 228
 229                 type = buf[0] >> 6;
 230                 /* ignore Reserved events */
 231                 if (type == TOUCH_EVENT_RESERVED)
 232                         continue;
 233
 234                 /* M06 sometimes sends bogus coordinates in TOUCH_DOWN */
 235                 if (tsdata->version == M06 && type == TOUCH_EVENT_DOWN)
 236                         continue;
 237
 238                 x = ((buf[0] << 8) | buf[1]) & 0x0fff;
 239                 y = ((buf[2] << 8) | buf[3]) & 0x0fff;
 240                 id = (buf[2] >> 4) & 0x0f;
 241                 down = type != TOUCH_EVENT_UP;
 242
 243                 input_mt_slot(tsdata->input, id);
 244                 input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER, down);
 245
 246                 if (!down)
 247                         continue;
 248
 249                 input_report_abs(tsdata->input, ABS_MT_POSITION_X, x);
 250                 input_report_abs(tsdata->input, ABS_MT_POSITION_Y, y);
 251         }
 252
 253         input_mt_report_pointer_emulation(tsdata->input, true);
 254         input_sync(tsdata->input);
 255
 256 out:
 257         return IRQ_HANDLED;
 258 }
 259
 260 static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
 261                                      u8 addr, u8 value)
 262 {
 263         u8 wrbuf[4];
 264
 265         switch (tsdata->version) {
 266         case M06:
 267                 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
 268                 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
 269                 wrbuf[2] = value;
 270                 wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2];
 271                 return edt_ft5x06_ts_readwrite(tsdata->client, 4,
 272                                         wrbuf, 0, NULL);
 273         case M09:
 274                 wrbuf[0] = addr;
 275                 wrbuf[1] = value;
 276
 277                 return edt_ft5x06_ts_readwrite(tsdata->client, 2,
 278                                         wrbuf, 0, NULL);
 279
 280         default:
 281                 return -EINVAL;
 282         }
 283 }
 284
 285 static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
 286                                     u8 addr)
 287 {
 288         u8 wrbuf[2], rdbuf[2];
 289         int error;
 290
 291         switch (tsdata->version) {
 292         case M06:
 293                 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
 294                 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
 295                 wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
 296
 297                 error = edt_ft5x06_ts_readwrite(tsdata->client, 2, wrbuf, 2,
 298                                                 rdbuf);
 299                 if (error)
 300                         return error;
 301
 302                 if ((wrbuf[0] ^ wrbuf[1] ^ rdbuf[0]) != rdbuf[1]) {
 303                         dev_err(&tsdata->client->dev,
 304                                 "crc error: 0x%02x expected, got 0x%02x\n",
 305                                 wrbuf[0] ^ wrbuf[1] ^ rdbuf[0],
 306                                 rdbuf[1]);
 307                         return -EIO;
 308                 }
 309                 break;
 310
 311         case M09:
 312                 wrbuf[0] = addr;
 313                 error = edt_ft5x06_ts_readwrite(tsdata->client, 1,
 314                                                 wrbuf, 1, rdbuf);
 315                 if (error)
 316                         return error;
 317                 break;
 318
 319         default:
 320                 return -EINVAL;
 321         }
 322
 323         return rdbuf[0];
 324 }
 325
 326 struct edt_ft5x06_attribute {
 327         struct device_attribute dattr;
 328         size_t field_offset;
 329         u8 limit_low;
 330         u8 limit_high;
 331         u8 addr_m06;
 332         u8 addr_m09;
 333 };
 334
 335 #define EDT_ATTR(_field, _mode, _addr_m06, _addr_m09,                   \
 336                 _limit_low, _limit_high)                                \
 337         struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = {        \
 338                 .dattr = __ATTR(_field, _mode,                          \
 339                                 edt_ft5x06_setting_show,                \
 340                                 edt_ft5x06_setting_store),              \
 341                 .field_offset = offsetof(struct edt_ft5x06_ts_data, _field), \
 342                 .addr_m06 = _addr_m06,                                  \
 343                 .addr_m09 = _addr_m09,                                  \
 344                 .limit_low = _limit_low,                                \
 345                 .limit_high = _limit_high,                              \
 346         }
 347
 348 static ssize_t edt_ft5x06_setting_show(struct device *dev,
 349                                        struct device_attribute *dattr,
 350                                        char *buf)
 351 {
 352         struct i2c_client *client = to_i2c_client(dev);
 353         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
 354         struct edt_ft5x06_attribute *attr =
 355                         container_of(dattr, struct edt_ft5x06_attribute, dattr);
 356         u8 *field = (u8 *)tsdata + attr->field_offset;
 357         int val;
 358         size_t count = 0;
 359         int error = 0;
 360         u8 addr;
 361
 362         mutex_lock(&tsdata->mutex);
 363
 364         if (tsdata->factory_mode) {
 365                 error = -EIO;
 366                 goto out;
 367         }
 368
 369         switch (tsdata->version) {
 370         case M06:
 371                 addr = attr->addr_m06;
 372                 break;
 373
 374         case M09:
 375                 addr = attr->addr_m09;
 376                 break;
 377
 378         default:
 379                 error = -ENODEV;
 380                 goto out;
 381         }
 382
 383         if (addr != NO_REGISTER) {
 384                 val = edt_ft5x06_register_read(tsdata, addr);
 385                 if (val < 0) {
 386                         error = val;
 387                         dev_err(&tsdata->client->dev,
 388                                 "Failed to fetch attribute %s, error %d\n",
 389                                 dattr->attr.name, error);
 390                         goto out;
 391                 }
 392         } else {
 393                 val = *field;
 394         }
 395
 396         if (val != *field) {
 397                 dev_warn(&tsdata->client->dev,
 398                          "%s: read (%d) and stored value (%d) differ\n",
 399                          dattr->attr.name, val, *field);
 400                 *field = val;
 401         }
 402
 403         count = scnprintf(buf, PAGE_SIZE, "%d\n", val);
 404 out:
 405         mutex_unlock(&tsdata->mutex);
 406         return error ?: count;
 407 }
 408
 409 static ssize_t edt_ft5x06_setting_store(struct device *dev,
 410                                         struct device_attribute *dattr,
 411                                         const char *buf, size_t count)
 412 {
 413         struct i2c_client *client = to_i2c_client(dev);
 414         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
 415         struct edt_ft5x06_attribute *attr =
 416                         container_of(dattr, struct edt_ft5x06_attribute, dattr);
 417         u8 *field = (u8 *)tsdata + attr->field_offset;
 418         unsigned int val;
 419         int error;
 420         u8 addr;
 421
 422         mutex_lock(&tsdata->mutex);
 423
 424         if (tsdata->factory_mode) {
 425                 error = -EIO;
 426                 goto out;
 427         }
 428
 429         error = kstrtouint(buf, 0, &val);
 430         if (error)
 431                 goto out;
 432
 433         if (val < attr->limit_low || val > attr->limit_high) {
 434                 error = -ERANGE;
 435                 goto out;
 436         }
 437
 438         switch (tsdata->version) {
 439         case M06:
 440                 addr = attr->addr_m06;
 441                 break;
 442
 443         case M09:
 444                 addr = attr->addr_m09;
 445                 break;
 446
 447         default:
 448                 error = -ENODEV;
 449                 goto out;
 450         }
 451
 452         if (addr != NO_REGISTER) {
 453                 error = edt_ft5x06_register_write(tsdata, addr, val);
 454                 if (error) {
 455                         dev_err(&tsdata->client->dev,
 456                                 "Failed to update attribute %s, error: %d\n",
 457                                 dattr->attr.name, error);
 458                         goto out;
 459                 }
 460         }
 461         *field = val;
 462
 463 out:
 464         mutex_unlock(&tsdata->mutex);
 465         return error ?: count;
 466 }
 467
 468 static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN,
 469                 M09_REGISTER_GAIN, 0, 31);
 470 static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET,
 471                 M09_REGISTER_OFFSET, 0, 31);
 472 static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD,
 473                 M09_REGISTER_THRESHOLD, 20, 80);
 474 static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE,
 475                 NO_REGISTER, 3, 14);
 476
 477 static struct attribute *edt_ft5x06_attrs[] = {
 478         &edt_ft5x06_attr_gain.dattr.attr,
 479         &edt_ft5x06_attr_offset.dattr.attr,
 480         &edt_ft5x06_attr_threshold.dattr.attr,
 481         &edt_ft5x06_attr_report_rate.dattr.attr,
 482         NULL
 483 };
 484
 485 static const struct attribute_group edt_ft5x06_attr_group = {
 486         .attrs = edt_ft5x06_attrs,
 487 };
 488
 489 #ifdef CONFIG_DEBUG_FS
 490 static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
 491 {
 492         struct i2c_client *client = tsdata->client;
 493         int retries = EDT_SWITCH_MODE_RETRIES;
 494         int ret;
 495         int error;
 496
 497         disable_irq(client->irq);
 498
 499         if (!tsdata->raw_buffer) {
 500                 tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y *
 501                                       sizeof(u16);
 502                 tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
 503                 if (!tsdata->raw_buffer) {
 504                         error = -ENOMEM;
 505                         goto err_out;
 506                 }
 507         }
 508
 509         /* mode register is 0x3c when in the work mode */
 510         if (tsdata->version == M09)
 511                 goto m09_out;
 512
 513         error = edt_ft5x06_register_write(tsdata, WORK_REGISTER_OPMODE, 0x03);
 514         if (error) {
 515                 dev_err(&client->dev,
 516                         "failed to switch to factory mode, error %d\n", error);
 517                 goto err_out;
 518         }
 519
 520         tsdata->factory_mode = true;
 521         do {
 522                 mdelay(EDT_SWITCH_MODE_DELAY);
 523                 /* mode register is 0x01 when in factory mode */
 524                 ret = edt_ft5x06_register_read(tsdata, FACTORY_REGISTER_OPMODE);
 525                 if (ret == 0x03)
 526                         break;
 527         } while (--retries > 0);
 528
 529         if (retries == 0) {
 530                 dev_err(&client->dev, "not in factory mode after %dms.\n",
 531                         EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
 532                 error = -EIO;
 533                 goto err_out;
 534         }
 535
 536         return 0;
 537
 538 err_out:
 539         kfree(tsdata->raw_buffer);
 540         tsdata->raw_buffer = NULL;
 541         tsdata->factory_mode = false;
 542         enable_irq(client->irq);
 543
 544         return error;
 545
 546 m09_out:
 547         dev_err(&client->dev, "No factory mode support for M09\n");
 548         return -EINVAL;
 549
 550 }
 551
 552 static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
 553 {
 554         struct i2c_client *client = tsdata->client;
 555         int retries = EDT_SWITCH_MODE_RETRIES;
 556         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 557         int ret;
 558         int error;
 559
 560         /* mode register is 0x01 when in the factory mode */
 561         error = edt_ft5x06_register_write(tsdata, FACTORY_REGISTER_OPMODE, 0x1);
 562         if (error) {
 563                 dev_err(&client->dev,
 564                         "failed to switch to work mode, error: %d\n", error);
 565                 return error;
 566         }
 567
 568         tsdata->factory_mode = false;
 569
 570         do {
 571                 mdelay(EDT_SWITCH_MODE_DELAY);
 572                 /* mode register is 0x01 when in factory mode */
 573                 ret = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OPMODE);
 574                 if (ret == 0x01)
 575                         break;
 576         } while (--retries > 0);
 577
 578         if (retries == 0) {
 579                 dev_err(&client->dev, "not in work mode after %dms.\n",
 580                         EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
 581                 tsdata->factory_mode = true;
 582                 return -EIO;
 583         }
 584
 585         kfree(tsdata->raw_buffer);
 586         tsdata->raw_buffer = NULL;
 587
 588         /* restore parameters */
 589         edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold,
 590                                   tsdata->threshold);
 591         edt_ft5x06_register_write(tsdata, reg_addr->reg_gain,
 592                                   tsdata->gain);
 593         edt_ft5x06_register_write(tsdata, reg_addr->reg_offset,
 594                                   tsdata->offset);
 595         if (reg_addr->reg_report_rate)
 596                 edt_ft5x06_register_write(tsdata, reg_addr->reg_report_rate,
 597                                   tsdata->report_rate);
 598
 599         enable_irq(client->irq);
 600
 601         return 0;
 602 }
 603
 604 static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
 605 {
 606         struct edt_ft5x06_ts_data *tsdata = data;
 607
 608         *mode = tsdata->factory_mode;
 609
 610         return 0;
 611 };
 612
 613 static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode)
 614 {
 615         struct edt_ft5x06_ts_data *tsdata = data;
 616         int retval = 0;
 617
 618         if (mode > 1)
 619                 return -ERANGE;
 620
 621         mutex_lock(&tsdata->mutex);
 622
 623         if (mode != tsdata->factory_mode) {
 624                 retval = mode ? edt_ft5x06_factory_mode(tsdata) :
 625                                 edt_ft5x06_work_mode(tsdata);
 626         }
 627
 628         mutex_unlock(&tsdata->mutex);
 629
 630         return retval;
 631 };
 632
 633 DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get,
 634                         edt_ft5x06_debugfs_mode_set, "%llu\n");
 635
 636 static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
 637                                 char __user *buf, size_t count, loff_t *off)
 638 {
 639         struct edt_ft5x06_ts_data *tsdata = file->private_data;
 640         struct i2c_client *client = tsdata->client;
 641         int retries  = EDT_RAW_DATA_RETRIES;
 642         int val, i, error;
 643         size_t read = 0;
 644         int colbytes;
 645         char wrbuf[3];
 646         u8 *rdbuf;
 647
 648         if (*off < 0 || *off >= tsdata->raw_bufsize)
 649                 return 0;
 650
 651         mutex_lock(&tsdata->mutex);
 652
 653         if (!tsdata->factory_mode || !tsdata->raw_buffer) {
 654                 error = -EIO;
 655                 goto out;
 656         }
 657
 658         error = edt_ft5x06_register_write(tsdata, 0x08, 0x01);
 659         if (error) {
 660                 dev_dbg(&client->dev,
 661                         "failed to write 0x08 register, error %d\n", error);
 662                 goto out;
 663         }
 664
 665         do {
 666                 msleep(EDT_RAW_DATA_DELAY);
 667                 val = edt_ft5x06_register_read(tsdata, 0x08);
 668                 if (val < 1)
 669                         break;
 670         } while (--retries > 0);
 671
 672         if (val < 0) {
 673                 error = val;
 674                 dev_dbg(&client->dev,
 675                         "failed to read 0x08 register, error %d\n", error);
 676                 goto out;
 677         }
 678
 679         if (retries == 0) {
 680                 dev_dbg(&client->dev,
 681                         "timed out waiting for register to settle\n");
 682                 error = -ETIMEDOUT;
 683                 goto out;
 684         }
 685
 686         rdbuf = tsdata->raw_buffer;
 687         colbytes = tsdata->num_y * sizeof(u16);
 688
 689         wrbuf[0] = 0xf5;
 690         wrbuf[1] = 0x0e;
 691         for (i = 0; i < tsdata->num_x; i++) {
 692                 wrbuf[2] = i;  /* column index */
 693                 error = edt_ft5x06_ts_readwrite(tsdata->client,
 694                                                 sizeof(wrbuf), wrbuf,
 695                                                 colbytes, rdbuf);
 696                 if (error)
 697                         goto out;
 698
 699                 rdbuf += colbytes;
 700         }
 701
 702         read = min_t(size_t, count, tsdata->raw_bufsize - *off);
 703         if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) {
 704                 error = -EFAULT;
 705                 goto out;
 706         }
 707
 708         *off += read;
 709 out:
 710         mutex_unlock(&tsdata->mutex);
 711         return error ?: read;
 712 };
 713
 714 static const struct file_operations debugfs_raw_data_fops = {
 715         .open = simple_open,
 716         .read = edt_ft5x06_debugfs_raw_data_read,
 717 };
 718
 719 static void
 720 edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
 721                               const char *debugfs_name)
 722 {
 723         tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
 724         if (!tsdata->debug_dir)
 725                 return;
 726
 727         debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x);
 728         debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y);
 729
 730         debugfs_create_file("mode", S_IRUSR | S_IWUSR,
 731                             tsdata->debug_dir, tsdata, &debugfs_mode_fops);
 732         debugfs_create_file("raw_data", S_IRUSR,
 733                             tsdata->debug_dir, tsdata, &debugfs_raw_data_fops);
 734 }
 735
 736 static void
 737 edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
 738 {
 739         debugfs_remove_recursive(tsdata->debug_dir);
 740         kfree(tsdata->raw_buffer);
 741 }
 742
 743 #else
 744
 745 static inline void
 746 edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
 747                               const char *debugfs_name)
 748 {
 749 }
 750
 751 static inline void
 752 edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
 753 {
 754 }
 755
 756 #endif /* CONFIG_DEBUGFS */
 757
 758 static int edt_ft5x06_ts_identify(struct i2c_client *client,
 759                                         struct edt_ft5x06_ts_data *tsdata,
 760                                         char *fw_version)
 761 {
 762         u8 rdbuf[EDT_NAME_LEN];
 763         char *p;
 764         int error;
 765         char *model_name = tsdata->name;
 766
 767         /* see what we find if we assume it is a M06 *
 768          * if we get less than EDT_NAME_LEN, we don't want
 769          * to have garbage in there
 770          */
 771         memset(rdbuf, 0, sizeof(rdbuf));
 772         error = edt_ft5x06_ts_readwrite(client, 1, "\xbb",
 773                                         EDT_NAME_LEN - 1, rdbuf);
 774         if (error)
 775                 return error;
 776
 777         /* if we find something consistent, stay with that assumption
 778          * at least M09 won't send 3 bytes here
 779          */
 780         if (!(strncasecmp(rdbuf + 1, "EP0", 3))) {
 781                 tsdata->version = M06;
 782
 783                 /* remove last '$' end marker */
 784                 rdbuf[EDT_NAME_LEN - 1] = '\0';
 785                 if (rdbuf[EDT_NAME_LEN - 2] == '$')
 786                         rdbuf[EDT_NAME_LEN - 2] = '\0';
 787
 788                 /* look for Model/Version separator */
 789                 p = strchr(rdbuf, '*');
 790                 if (p)
 791                         *p++ = '\0';
 792                 strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
 793                 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
 794         } else {
 795                 /* since there are only two versions around (M06, M09) */
 796                 tsdata->version = M09;
 797
 798                 error = edt_ft5x06_ts_readwrite(client, 1, "\xA6",
 799                                                 2, rdbuf);
 800                 if (error)
 801                         return error;
 802
 803                 strlcpy(fw_version, rdbuf, 2);
 804
 805                 error = edt_ft5x06_ts_readwrite(client, 1, "\xA8",
 806                                                 1, rdbuf);
 807                 if (error)
 808                         return error;
 809
 810                 snprintf(model_name, EDT_NAME_LEN, "EP0%i%i0M09",
 811                         rdbuf[0] >> 4, rdbuf[0] & 0x0F);
 812         }
 813
 814         return 0;
 815 }
 816
 817 static void edt_ft5x06_ts_get_defaults(struct device *dev,
 818                                        struct edt_ft5x06_ts_data *tsdata)
 819 {
 820         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 821         u32 val;
 822         int error;
 823
 824         error = device_property_read_u32(dev, "threshold", &val);
 825         if (!error) {
 826                 edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold, val);
 827                 tsdata->threshold = val;
 828         }
 829
 830         error = device_property_read_u32(dev, "gain", &val);
 831         if (!error) {
 832                 edt_ft5x06_register_write(tsdata, reg_addr->reg_gain, val);
 833                 tsdata->gain = val;
 834         }
 835
 836         error = device_property_read_u32(dev, "offset", &val);
 837         if (!error) {
 838                 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset, val);
 839                 tsdata->offset = val;
 840         }
 841 }
 842
 843 static void
 844 edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
 845 {
 846         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 847
 848         tsdata->threshold = edt_ft5x06_register_read(tsdata,
 849                                                      reg_addr->reg_threshold);
 850         tsdata->gain = edt_ft5x06_register_read(tsdata, reg_addr->reg_gain);
 851         tsdata->offset = edt_ft5x06_register_read(tsdata, reg_addr->reg_offset);
 852         if (reg_addr->reg_report_rate != NO_REGISTER)
 853                 tsdata->report_rate = edt_ft5x06_register_read(tsdata,
 854                                                 reg_addr->reg_report_rate);
 855         tsdata->num_x = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_x);
 856         tsdata->num_y = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_y);
 857 }
 858
 859 static void
 860 edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
 861 {
 862         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 863
 864         switch (tsdata->version) {
 865         case M06:
 866                 reg_addr->reg_threshold = WORK_REGISTER_THRESHOLD;
 867                 reg_addr->reg_report_rate = WORK_REGISTER_REPORT_RATE;
 868                 reg_addr->reg_gain = WORK_REGISTER_GAIN;
 869                 reg_addr->reg_offset = WORK_REGISTER_OFFSET;
 870                 reg_addr->reg_num_x = WORK_REGISTER_NUM_X;
 871                 reg_addr->reg_num_y = WORK_REGISTER_NUM_Y;
 872                 break;
 873
 874         case M09:
 875                 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
 876                 reg_addr->reg_gain = M09_REGISTER_GAIN;
 877                 reg_addr->reg_offset = M09_REGISTER_OFFSET;
 878                 reg_addr->reg_num_x = M09_REGISTER_NUM_X;
 879                 reg_addr->reg_num_y = M09_REGISTER_NUM_Y;
 880                 break;
 881         }
 882 }
 883
 884 static int edt_ft5x06_ts_probe(struct i2c_client *client,
 885                                          const struct i2c_device_id *id)
 886 {
 887         const struct edt_i2c_chip_data *chip_data;
 888         struct edt_ft5x06_ts_data *tsdata;
 889         struct input_dev *input;
 890         unsigned long irq_flags;
 891         int error;
 892         char fw_version[EDT_NAME_LEN];
 893
 894         dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");
 895
 896         tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
 897         if (!tsdata) {
 898                 dev_err(&client->dev, "failed to allocate driver data.\n");
 899                 return -ENOMEM;
 900         }
 901
 902         chip_data = of_device_get_match_data(&client->dev);
 903         if (!chip_data)
 904                 chip_data = (const struct edt_i2c_chip_data *)id->driver_data;
 905         if (!chip_data || !chip_data->max_support_points) {
 906                 dev_err(&client->dev, "invalid or missing chip data\n");
 907                 return -EINVAL;
 908         }
 909
 910         tsdata->max_support_points = chip_data->max_support_points;
 911
 912         tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev,
 913                                                      "reset", GPIOD_OUT_HIGH);
 914         if (IS_ERR(tsdata->reset_gpio)) {
 915                 error = PTR_ERR(tsdata->reset_gpio);
 916                 dev_err(&client->dev,
 917                         "Failed to request GPIO reset pin, error %d\n", error);
 918                 return error;
 919         }
 920
 921         tsdata->wake_gpio = devm_gpiod_get_optional(&client->dev,
 922                                                     "wake", GPIOD_OUT_LOW);
 923         if (IS_ERR(tsdata->wake_gpio)) {
 924                 error = PTR_ERR(tsdata->wake_gpio);
 925                 dev_err(&client->dev,
 926                         "Failed to request GPIO wake pin, error %d\n", error);
 927                 return error;
 928         }
 929
 930         if (tsdata->wake_gpio) {
 931                 usleep_range(5000, 6000);
 932                 gpiod_set_value_cansleep(tsdata->wake_gpio, 1);
 933         }
 934
 935         if (tsdata->reset_gpio) {
 936                 usleep_range(5000, 6000);
 937                 gpiod_set_value_cansleep(tsdata->reset_gpio, 0);
 938                 msleep(300);
 939         }
 940
 941         input = devm_input_allocate_device(&client->dev);
 942         if (!input) {
 943                 dev_err(&client->dev, "failed to allocate input device.\n");
 944                 return -ENOMEM;
 945         }
 946
 947         mutex_init(&tsdata->mutex);
 948         tsdata->client = client;
 949         tsdata->input = input;
 950         tsdata->factory_mode = false;
 951
 952         error = edt_ft5x06_ts_identify(client, tsdata, fw_version);
 953         if (error) {
 954                 dev_err(&client->dev, "touchscreen probe failed\n");
 955                 return error;
 956         }
 957
 958         edt_ft5x06_ts_set_regs(tsdata);
 959         edt_ft5x06_ts_get_defaults(&client->dev, tsdata);
 960         edt_ft5x06_ts_get_parameters(tsdata);
 961
 962         dev_dbg(&client->dev,
 963                 "Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
 964                 tsdata->name, fw_version, tsdata->num_x, tsdata->num_y);
 965
 966         input->name = tsdata->name;
 967         input->id.bustype = BUS_I2C;
 968         input->dev.parent = &client->dev;
 969
 970         input_set_abs_params(input, ABS_MT_POSITION_X,
 971                              0, tsdata->num_x * 64 - 1, 0, 0);
 972         input_set_abs_params(input, ABS_MT_POSITION_Y,
 973                              0, tsdata->num_y * 64 - 1, 0, 0);
 974
 975         touchscreen_parse_properties(input, true);
 976
 977         error = input_mt_init_slots(input, tsdata->max_support_points,
 978                                 INPUT_MT_DIRECT);
 979         if (error) {
 980                 dev_err(&client->dev, "Unable to init MT slots.\n");
 981                 return error;
 982         }
 983
 984         input_set_drvdata(input, tsdata);
 985         i2c_set_clientdata(client, tsdata);
 986
 987         irq_flags = irq_get_trigger_type(client->irq);
 988         if (irq_flags == IRQF_TRIGGER_NONE)
 989                 irq_flags = IRQF_TRIGGER_FALLING;
 990         irq_flags |= IRQF_ONESHOT;
 991
 992         error = devm_request_threaded_irq(&client->dev, client->irq,
 993                                         NULL, edt_ft5x06_ts_isr, irq_flags,
 994                                         client->name, tsdata);
 995         if (error) {
 996                 dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
 997                 return error;
 998         }
 999
1000         error = sysfs_create_group(&client->dev.kobj, &edt_ft5x06_attr_group);
1001         if (error)
1002                 return error;
1003
1004         error = input_register_device(input);
1005         if (error)
1006                 goto err_remove_attrs;
1007
1008         edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
1009         device_init_wakeup(&client->dev, 1);
1010
1011         dev_dbg(&client->dev,
1012                 "EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n",
1013                 client->irq,
1014                 tsdata->wake_gpio ? desc_to_gpio(tsdata->wake_gpio) : -1,
1015                 tsdata->reset_gpio ? desc_to_gpio(tsdata->reset_gpio) : -1);
1016
1017         return 0;
1018
1019 err_remove_attrs:
1020         sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
1021         return error;
1022 }
1023
1024 static int edt_ft5x06_ts_remove(struct i2c_client *client)
1025 {
1026         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1027
1028         edt_ft5x06_ts_teardown_debugfs(tsdata);
1029         sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
1030
1031         return 0;
1032 }
1033
1034 static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev)
1035 {
1036         struct i2c_client *client = to_i2c_client(dev);
1037
1038         if (device_may_wakeup(dev))
1039                 enable_irq_wake(client->irq);
1040
1041         return 0;
1042 }
1043
1044 static int __maybe_unused edt_ft5x06_ts_resume(struct device *dev)
1045 {
1046         struct i2c_client *client = to_i2c_client(dev);
1047
1048         if (device_may_wakeup(dev))
1049                 disable_irq_wake(client->irq);
1050
1051         return 0;
1052 }
1053
1054 static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
1055                          edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);
1056
1057 static const struct edt_i2c_chip_data edt_ft5x06_data = {
1058         .max_support_points = 5,
1059 };
1060
1061 static const struct edt_i2c_chip_data edt_ft5506_data = {
1062         .max_support_points = 10,
1063 };
1064
1065 static const struct i2c_device_id edt_ft5x06_ts_id[] = {
1066         { .name = "edt-ft5x06", .driver_data = (long)&edt_ft5x06_data },
1067         { .name = "edt-ft5506", .driver_data = (long)&edt_ft5506_data },
1068         { /* sentinel */ }
1069 };
1070 MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
1071
1072 #ifdef CONFIG_OF
1073 static const struct of_device_id edt_ft5x06_of_match[] = {
1074         { .compatible = "edt,edt-ft5206", .data = &edt_ft5x06_data },
1075         { .compatible = "edt,edt-ft5306", .data = &edt_ft5x06_data },
1076         { .compatible = "edt,edt-ft5406", .data = &edt_ft5x06_data },
1077         { .compatible = "edt,edt-ft5506", .data = &edt_ft5506_data },
1078         { /* sentinel */ }
1079 };
1080 MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match);
1081 #endif
1082
1083 static struct i2c_driver edt_ft5x06_ts_driver = {
1084         .driver = {
1085                 .name = "edt_ft5x06",
1086                 .of_match_table = of_match_ptr(edt_ft5x06_of_match),
1087                 .pm = &edt_ft5x06_ts_pm_ops,
1088         },
1089         .id_table = edt_ft5x06_ts_id,
1090         .probe    = edt_ft5x06_ts_probe,
1091         .remove   = edt_ft5x06_ts_remove,
1092 };
1093
1094 module_i2c_driver(edt_ft5x06_ts_driver);
1095
1096 MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>");
1097 MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
1098 MODULE_LICENSE("GPL");