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/edt-ft5x06.h>
  41
  42 #define MAX_SUPPORT_POINTS              5
  43
  44 #define WORK_REGISTER_THRESHOLD         0x00
  45 #define WORK_REGISTER_REPORT_RATE       0x08
  46 #define WORK_REGISTER_GAIN              0x30
  47 #define WORK_REGISTER_OFFSET            0x31
  48 #define WORK_REGISTER_NUM_X             0x33
  49 #define WORK_REGISTER_NUM_Y             0x34
  50
  51 #define M09_REGISTER_THRESHOLD          0x80
  52 #define M09_REGISTER_GAIN               0x92
  53 #define M09_REGISTER_OFFSET             0x93
  54 #define M09_REGISTER_NUM_X              0x94
  55 #define M09_REGISTER_NUM_Y              0x95
  56
  57 #define NO_REGISTER                     0xff
  58
  59 #define WORK_REGISTER_OPMODE            0x3c
  60 #define FACTORY_REGISTER_OPMODE         0x01
  61
  62 #define TOUCH_EVENT_DOWN                0x00
  63 #define TOUCH_EVENT_UP                  0x01
  64 #define TOUCH_EVENT_ON                  0x02
  65 #define TOUCH_EVENT_RESERVED            0x03
  66
  67 #define EDT_NAME_LEN                    23
  68 #define EDT_SWITCH_MODE_RETRIES         10
  69 #define EDT_SWITCH_MODE_DELAY           5 /* msec */
  70 #define EDT_RAW_DATA_RETRIES            100
  71 #define EDT_RAW_DATA_DELAY              1 /* msec */
  72
  73 enum edt_ver {
  74         M06,
  75         M09,
  76 };
  77
  78 struct edt_reg_addr {
  79         int reg_threshold;
  80         int reg_report_rate;
  81         int reg_gain;
  82         int reg_offset;
  83         int reg_num_x;
  84         int reg_num_y;
  85 };
  86
  87 struct edt_ft5x06_ts_data {
  88         struct i2c_client *client;
  89         struct input_dev *input;
  90         u16 num_x;
  91         u16 num_y;
  92
  93         int reset_pin;
  94         int irq_pin;
  95         int wake_pin;
  96
  97 #if defined(CONFIG_DEBUG_FS)
  98         struct dentry *debug_dir;
  99         u8 *raw_buffer;
 100         size_t raw_bufsize;
 101 #endif
 102
 103         struct mutex mutex;
 104         bool factory_mode;
 105         int threshold;
 106         int gain;
 107         int offset;
 108         int report_rate;
 109
 110         char name[EDT_NAME_LEN];
 111
 112         struct edt_reg_addr reg_addr;
 113         enum edt_ver version;
 114 };
 115
 116 static int edt_ft5x06_ts_readwrite(struct i2c_client *client,
 117                                    u16 wr_len, u8 *wr_buf,
 118                                    u16 rd_len, u8 *rd_buf)
 119 {
 120         struct i2c_msg wrmsg[2];
 121         int i = 0;
 122         int ret;
 123
 124         if (wr_len) {
 125                 wrmsg[i].addr  = client->addr;
 126                 wrmsg[i].flags = 0;
 127                 wrmsg[i].len = wr_len;
 128                 wrmsg[i].buf = wr_buf;
 129                 i++;
 130         }
 131         if (rd_len) {
 132                 wrmsg[i].addr  = client->addr;
 133                 wrmsg[i].flags = I2C_M_RD;
 134                 wrmsg[i].len = rd_len;
 135                 wrmsg[i].buf = rd_buf;
 136                 i++;
 137         }
 138
 139         ret = i2c_transfer(client->adapter, wrmsg, i);
 140         if (ret < 0)
 141                 return ret;
 142         if (ret != i)
 143                 return -EIO;
 144
 145         return 0;
 146 }
 147
 148 static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata,
 149                                     u8 *buf, int buflen)
 150 {
 151         int i;
 152         u8 crc = 0;
 153
 154         for (i = 0; i < buflen - 1; i++)
 155                 crc ^= buf[i];
 156
 157         if (crc != buf[buflen-1]) {
 158                 dev_err_ratelimited(&tsdata->client->dev,
 159                                     "crc error: 0x%02x expected, got 0x%02x\n",
 160                                     crc, buf[buflen-1]);
 161                 return false;
 162         }
 163
 164         return true;
 165 }
 166
 167 static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
 168 {
 169         struct edt_ft5x06_ts_data *tsdata = dev_id;
 170         struct device *dev = &tsdata->client->dev;
 171         u8 cmd;
 172         u8 rdbuf[29];
 173         int i, type, x, y, id;
 174         int offset, tplen, datalen;
 175         int error;
 176
 177         switch (tsdata->version) {
 178         case M06:
 179                 cmd = 0xf9; /* tell the controller to send touch data */
 180                 offset = 5; /* where the actual touch data starts */
 181                 tplen = 4;  /* data comes in so called frames */
 182                 datalen = 26; /* how much bytes to listen for */
 183                 break;
 184
 185         case M09:
 186                 cmd = 0x02;
 187                 offset = 1;
 188                 tplen = 6;
 189                 datalen = 29;
 190                 break;
 191
 192         default:
 193                 goto out;
 194         }
 195
 196         memset(rdbuf, 0, sizeof(rdbuf));
 197
 198         error = edt_ft5x06_ts_readwrite(tsdata->client,
 199                                         sizeof(cmd), &cmd,
 200                                         datalen, rdbuf);
 201         if (error) {
 202                 dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
 203                                     error);
 204                 goto out;
 205         }
 206
 207         /* M09 does not send header or CRC */
 208         if (tsdata->version == M06) {
 209                 if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa ||
 210                         rdbuf[2] != datalen) {
 211                         dev_err_ratelimited(dev,
 212                                         "Unexpected header: %02x%02x%02x!\n",
 213                                         rdbuf[0], rdbuf[1], rdbuf[2]);
 214                         goto out;
 215                 }
 216
 217                 if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, datalen))
 218                         goto out;
 219         }
 220
 221         for (i = 0; i < MAX_SUPPORT_POINTS; i++) {
 222                 u8 *buf = &rdbuf[i * tplen + offset];
 223                 bool down;
 224
 225                 type = buf[0] >> 6;
 226                 /* ignore Reserved events */
 227                 if (type == TOUCH_EVENT_RESERVED)
 228                         continue;
 229
 230                 /* M06 sometimes sends bogus coordinates in TOUCH_DOWN */
 231                 if (tsdata->version == M06 && type == TOUCH_EVENT_DOWN)
 232                         continue;
 233
 234                 x = ((buf[0] << 8) | buf[1]) & 0x0fff;
 235                 y = ((buf[2] << 8) | buf[3]) & 0x0fff;
 236                 id = (buf[2] >> 4) & 0x0f;
 237                 down = type != TOUCH_EVENT_UP;
 238
 239                 input_mt_slot(tsdata->input, id);
 240                 input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER, down);
 241
 242                 if (!down)
 243                         continue;
 244
 245                 input_report_abs(tsdata->input, ABS_MT_POSITION_X, x);
 246                 input_report_abs(tsdata->input, ABS_MT_POSITION_Y, y);
 247         }
 248
 249         input_mt_report_pointer_emulation(tsdata->input, true);
 250         input_sync(tsdata->input);
 251
 252 out:
 253         return IRQ_HANDLED;
 254 }
 255
 256 static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
 257                                      u8 addr, u8 value)
 258 {
 259         u8 wrbuf[4];
 260
 261         switch (tsdata->version) {
 262         case M06:
 263                 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
 264                 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
 265                 wrbuf[2] = value;
 266                 wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2];
 267                 return edt_ft5x06_ts_readwrite(tsdata->client, 4,
 268                                         wrbuf, 0, NULL);
 269         case M09:
 270                 wrbuf[0] = addr;
 271                 wrbuf[1] = value;
 272
 273                 return edt_ft5x06_ts_readwrite(tsdata->client, 2,
 274                                         wrbuf, 0, NULL);
 275
 276         default:
 277                 return -EINVAL;
 278         }
 279 }
 280
 281 static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
 282                                     u8 addr)
 283 {
 284         u8 wrbuf[2], rdbuf[2];
 285         int error;
 286
 287         switch (tsdata->version) {
 288         case M06:
 289                 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
 290                 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
 291                 wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
 292
 293                 error = edt_ft5x06_ts_readwrite(tsdata->client, 2, wrbuf, 2,
 294                                                 rdbuf);
 295                 if (error)
 296                         return error;
 297
 298                 if ((wrbuf[0] ^ wrbuf[1] ^ rdbuf[0]) != rdbuf[1]) {
 299                         dev_err(&tsdata->client->dev,
 300                                 "crc error: 0x%02x expected, got 0x%02x\n",
 301                                 wrbuf[0] ^ wrbuf[1] ^ rdbuf[0],
 302                                 rdbuf[1]);
 303                         return -EIO;
 304                 }
 305                 break;
 306
 307         case M09:
 308                 wrbuf[0] = addr;
 309                 error = edt_ft5x06_ts_readwrite(tsdata->client, 1,
 310                                                 wrbuf, 1, rdbuf);
 311                 if (error)
 312                         return error;
 313                 break;
 314
 315         default:
 316                 return -EINVAL;
 317         }
 318
 319         return rdbuf[0];
 320 }
 321
 322 struct edt_ft5x06_attribute {
 323         struct device_attribute dattr;
 324         size_t field_offset;
 325         u8 limit_low;
 326         u8 limit_high;
 327         u8 addr_m06;
 328         u8 addr_m09;
 329 };
 330
 331 #define EDT_ATTR(_field, _mode, _addr_m06, _addr_m09,                   \
 332                 _limit_low, _limit_high)                                \
 333         struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = {        \
 334                 .dattr = __ATTR(_field, _mode,                          \
 335                                 edt_ft5x06_setting_show,                \
 336                                 edt_ft5x06_setting_store),              \
 337                 .field_offset = offsetof(struct edt_ft5x06_ts_data, _field), \
 338                 .addr_m06 = _addr_m06,                                  \
 339                 .addr_m09 = _addr_m09,                                  \
 340                 .limit_low = _limit_low,                                \
 341                 .limit_high = _limit_high,                              \
 342         }
 343
 344 static ssize_t edt_ft5x06_setting_show(struct device *dev,
 345                                        struct device_attribute *dattr,
 346                                        char *buf)
 347 {
 348         struct i2c_client *client = to_i2c_client(dev);
 349         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
 350         struct edt_ft5x06_attribute *attr =
 351                         container_of(dattr, struct edt_ft5x06_attribute, dattr);
 352         u8 *field = (u8 *)tsdata + attr->field_offset;
 353         int val;
 354         size_t count = 0;
 355         int error = 0;
 356         u8 addr;
 357
 358         mutex_lock(&tsdata->mutex);
 359
 360         if (tsdata->factory_mode) {
 361                 error = -EIO;
 362                 goto out;
 363         }
 364
 365         switch (tsdata->version) {
 366         case M06:
 367                 addr = attr->addr_m06;
 368                 break;
 369
 370         case M09:
 371                 addr = attr->addr_m09;
 372                 break;
 373
 374         default:
 375                 error = -ENODEV;
 376                 goto out;
 377         }
 378
 379         if (addr != NO_REGISTER) {
 380                 val = edt_ft5x06_register_read(tsdata, addr);
 381                 if (val < 0) {
 382                         error = val;
 383                         dev_err(&tsdata->client->dev,
 384                                 "Failed to fetch attribute %s, error %d\n",
 385                                 dattr->attr.name, error);
 386                         goto out;
 387                 }
 388         } else {
 389                 val = *field;
 390         }
 391
 392         if (val != *field) {
 393                 dev_warn(&tsdata->client->dev,
 394                          "%s: read (%d) and stored value (%d) differ\n",
 395                          dattr->attr.name, val, *field);
 396                 *field = val;
 397         }
 398
 399         count = scnprintf(buf, PAGE_SIZE, "%d\n", val);
 400 out:
 401         mutex_unlock(&tsdata->mutex);
 402         return error ?: count;
 403 }
 404
 405 static ssize_t edt_ft5x06_setting_store(struct device *dev,
 406                                         struct device_attribute *dattr,
 407                                         const char *buf, size_t count)
 408 {
 409         struct i2c_client *client = to_i2c_client(dev);
 410         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
 411         struct edt_ft5x06_attribute *attr =
 412                         container_of(dattr, struct edt_ft5x06_attribute, dattr);
 413         u8 *field = (u8 *)tsdata + attr->field_offset;
 414         unsigned int val;
 415         int error;
 416         u8 addr;
 417
 418         mutex_lock(&tsdata->mutex);
 419
 420         if (tsdata->factory_mode) {
 421                 error = -EIO;
 422                 goto out;
 423         }
 424
 425         error = kstrtouint(buf, 0, &val);
 426         if (error)
 427                 goto out;
 428
 429         if (val < attr->limit_low || val > attr->limit_high) {
 430                 error = -ERANGE;
 431                 goto out;
 432         }
 433
 434         switch (tsdata->version) {
 435         case M06:
 436                 addr = attr->addr_m06;
 437                 break;
 438
 439         case M09:
 440                 addr = attr->addr_m09;
 441                 break;
 442
 443         default:
 444                 error = -ENODEV;
 445                 goto out;
 446         }
 447
 448         if (addr != NO_REGISTER) {
 449                 error = edt_ft5x06_register_write(tsdata, addr, val);
 450                 if (error) {
 451                         dev_err(&tsdata->client->dev,
 452                                 "Failed to update attribute %s, error: %d\n",
 453                                 dattr->attr.name, error);
 454                         goto out;
 455                 }
 456         }
 457         *field = val;
 458
 459 out:
 460         mutex_unlock(&tsdata->mutex);
 461         return error ?: count;
 462 }
 463
 464 static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN,
 465                 M09_REGISTER_GAIN, 0, 31);
 466 static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET,
 467                 M09_REGISTER_OFFSET, 0, 31);
 468 static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD,
 469                 M09_REGISTER_THRESHOLD, 20, 80);
 470 static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE,
 471                 NO_REGISTER, 3, 14);
 472
 473 static struct attribute *edt_ft5x06_attrs[] = {
 474         &edt_ft5x06_attr_gain.dattr.attr,
 475         &edt_ft5x06_attr_offset.dattr.attr,
 476         &edt_ft5x06_attr_threshold.dattr.attr,
 477         &edt_ft5x06_attr_report_rate.dattr.attr,
 478         NULL
 479 };
 480
 481 static const struct attribute_group edt_ft5x06_attr_group = {
 482         .attrs = edt_ft5x06_attrs,
 483 };
 484
 485 #ifdef CONFIG_DEBUG_FS
 486 static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
 487 {
 488         struct i2c_client *client = tsdata->client;
 489         int retries = EDT_SWITCH_MODE_RETRIES;
 490         int ret;
 491         int error;
 492
 493         disable_irq(client->irq);
 494
 495         if (!tsdata->raw_buffer) {
 496                 tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y *
 497                                       sizeof(u16);
 498                 tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
 499                 if (!tsdata->raw_buffer) {
 500                         error = -ENOMEM;
 501                         goto err_out;
 502                 }
 503         }
 504
 505         /* mode register is 0x3c when in the work mode */
 506         if (tsdata->version == M09)
 507                 goto m09_out;
 508
 509         error = edt_ft5x06_register_write(tsdata, WORK_REGISTER_OPMODE, 0x03);
 510         if (error) {
 511                 dev_err(&client->dev,
 512                         "failed to switch to factory mode, error %d\n", error);
 513                 goto err_out;
 514         }
 515
 516         tsdata->factory_mode = true;
 517         do {
 518                 mdelay(EDT_SWITCH_MODE_DELAY);
 519                 /* mode register is 0x01 when in factory mode */
 520                 ret = edt_ft5x06_register_read(tsdata, FACTORY_REGISTER_OPMODE);
 521                 if (ret == 0x03)
 522                         break;
 523         } while (--retries > 0);
 524
 525         if (retries == 0) {
 526                 dev_err(&client->dev, "not in factory mode after %dms.\n",
 527                         EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
 528                 error = -EIO;
 529                 goto err_out;
 530         }
 531
 532         return 0;
 533
 534 err_out:
 535         kfree(tsdata->raw_buffer);
 536         tsdata->raw_buffer = NULL;
 537         tsdata->factory_mode = false;
 538         enable_irq(client->irq);
 539
 540         return error;
 541
 542 m09_out:
 543         dev_err(&client->dev, "No factory mode support for M09\n");
 544         return -EINVAL;
 545
 546 }
 547
 548 static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
 549 {
 550         struct i2c_client *client = tsdata->client;
 551         int retries = EDT_SWITCH_MODE_RETRIES;
 552         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 553         int ret;
 554         int error;
 555
 556         /* mode register is 0x01 when in the factory mode */
 557         error = edt_ft5x06_register_write(tsdata, FACTORY_REGISTER_OPMODE, 0x1);
 558         if (error) {
 559                 dev_err(&client->dev,
 560                         "failed to switch to work mode, error: %d\n", error);
 561                 return error;
 562         }
 563
 564         tsdata->factory_mode = false;
 565
 566         do {
 567                 mdelay(EDT_SWITCH_MODE_DELAY);
 568                 /* mode register is 0x01 when in factory mode */
 569                 ret = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OPMODE);
 570                 if (ret == 0x01)
 571                         break;
 572         } while (--retries > 0);
 573
 574         if (retries == 0) {
 575                 dev_err(&client->dev, "not in work mode after %dms.\n",
 576                         EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
 577                 tsdata->factory_mode = true;
 578                 return -EIO;
 579         }
 580
 581         kfree(tsdata->raw_buffer);
 582         tsdata->raw_buffer = NULL;
 583
 584         /* restore parameters */
 585         edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold,
 586                                   tsdata->threshold);
 587         edt_ft5x06_register_write(tsdata, reg_addr->reg_gain,
 588                                   tsdata->gain);
 589         edt_ft5x06_register_write(tsdata, reg_addr->reg_offset,
 590                                   tsdata->offset);
 591         if (reg_addr->reg_report_rate)
 592                 edt_ft5x06_register_write(tsdata, reg_addr->reg_report_rate,
 593                                   tsdata->report_rate);
 594
 595         enable_irq(client->irq);
 596
 597         return 0;
 598 }
 599
 600 static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
 601 {
 602         struct edt_ft5x06_ts_data *tsdata = data;
 603
 604         *mode = tsdata->factory_mode;
 605
 606         return 0;
 607 };
 608
 609 static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode)
 610 {
 611         struct edt_ft5x06_ts_data *tsdata = data;
 612         int retval = 0;
 613
 614         if (mode > 1)
 615                 return -ERANGE;
 616
 617         mutex_lock(&tsdata->mutex);
 618
 619         if (mode != tsdata->factory_mode) {
 620                 retval = mode ? edt_ft5x06_factory_mode(tsdata) :
 621                                 edt_ft5x06_work_mode(tsdata);
 622         }
 623
 624         mutex_unlock(&tsdata->mutex);
 625
 626         return retval;
 627 };
 628
 629 DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get,
 630                         edt_ft5x06_debugfs_mode_set, "%llu\n");
 631
 632 static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
 633                                 char __user *buf, size_t count, loff_t *off)
 634 {
 635         struct edt_ft5x06_ts_data *tsdata = file->private_data;
 636         struct i2c_client *client = tsdata->client;
 637         int retries  = EDT_RAW_DATA_RETRIES;
 638         int val, i, error;
 639         size_t read = 0;
 640         int colbytes;
 641         char wrbuf[3];
 642         u8 *rdbuf;
 643
 644         if (*off < 0 || *off >= tsdata->raw_bufsize)
 645                 return 0;
 646
 647         mutex_lock(&tsdata->mutex);
 648
 649         if (!tsdata->factory_mode || !tsdata->raw_buffer) {
 650                 error = -EIO;
 651                 goto out;
 652         }
 653
 654         error = edt_ft5x06_register_write(tsdata, 0x08, 0x01);
 655         if (error) {
 656                 dev_dbg(&client->dev,
 657                         "failed to write 0x08 register, error %d\n", error);
 658                 goto out;
 659         }
 660
 661         do {
 662                 msleep(EDT_RAW_DATA_DELAY);
 663                 val = edt_ft5x06_register_read(tsdata, 0x08);
 664                 if (val < 1)
 665                         break;
 666         } while (--retries > 0);
 667
 668         if (val < 0) {
 669                 error = val;
 670                 dev_dbg(&client->dev,
 671                         "failed to read 0x08 register, error %d\n", error);
 672                 goto out;
 673         }
 674
 675         if (retries == 0) {
 676                 dev_dbg(&client->dev,
 677                         "timed out waiting for register to settle\n");
 678                 error = -ETIMEDOUT;
 679                 goto out;
 680         }
 681
 682         rdbuf = tsdata->raw_buffer;
 683         colbytes = tsdata->num_y * sizeof(u16);
 684
 685         wrbuf[0] = 0xf5;
 686         wrbuf[1] = 0x0e;
 687         for (i = 0; i < tsdata->num_x; i++) {
 688                 wrbuf[2] = i;  /* column index */
 689                 error = edt_ft5x06_ts_readwrite(tsdata->client,
 690                                                 sizeof(wrbuf), wrbuf,
 691                                                 colbytes, rdbuf);
 692                 if (error)
 693                         goto out;
 694
 695                 rdbuf += colbytes;
 696         }
 697
 698         read = min_t(size_t, count, tsdata->raw_bufsize - *off);
 699         if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) {
 700                 error = -EFAULT;
 701                 goto out;
 702         }
 703
 704         *off += read;
 705 out:
 706         mutex_unlock(&tsdata->mutex);
 707         return error ?: read;
 708 };
 709
 710 static const struct file_operations debugfs_raw_data_fops = {
 711         .open = simple_open,
 712         .read = edt_ft5x06_debugfs_raw_data_read,
 713 };
 714
 715 static void
 716 edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
 717                               const char *debugfs_name)
 718 {
 719         tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
 720         if (!tsdata->debug_dir)
 721                 return;
 722
 723         debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x);
 724         debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y);
 725
 726         debugfs_create_file("mode", S_IRUSR | S_IWUSR,
 727                             tsdata->debug_dir, tsdata, &debugfs_mode_fops);
 728         debugfs_create_file("raw_data", S_IRUSR,
 729                             tsdata->debug_dir, tsdata, &debugfs_raw_data_fops);
 730 }
 731
 732 static void
 733 edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
 734 {
 735         debugfs_remove_recursive(tsdata->debug_dir);
 736         kfree(tsdata->raw_buffer);
 737 }
 738
 739 #else
 740
 741 static inline void
 742 edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
 743                               const char *debugfs_name)
 744 {
 745 }
 746
 747 static inline void
 748 edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
 749 {
 750 }
 751
 752 #endif /* CONFIG_DEBUGFS */
 753
 754 static int edt_ft5x06_ts_reset(struct i2c_client *client,
 755                         struct edt_ft5x06_ts_data *tsdata)
 756 {
 757         int error;
 758
 759         if (gpio_is_valid(tsdata->wake_pin)) {
 760                 error = devm_gpio_request_one(&client->dev,
 761                                         tsdata->wake_pin, GPIOF_OUT_INIT_LOW,
 762                                         "edt-ft5x06 wake");
 763                 if (error) {
 764                         dev_err(&client->dev,
 765                                 "Failed to request GPIO %d as wake pin, error %d\n",
 766                                 tsdata->wake_pin, error);
 767                         return error;
 768                 }
 769
 770                 msleep(5);
 771                 gpio_set_value(tsdata->wake_pin, 1);
 772         }
 773         if (gpio_is_valid(tsdata->reset_pin)) {
 774                 /* this pulls reset down, enabling the low active reset */
 775                 error = devm_gpio_request_one(&client->dev,
 776                                         tsdata->reset_pin, GPIOF_OUT_INIT_LOW,
 777                                         "edt-ft5x06 reset");
 778                 if (error) {
 779                         dev_err(&client->dev,
 780                                 "Failed to request GPIO %d as reset pin, error %d\n",
 781                                 tsdata->reset_pin, error);
 782                         return error;
 783                 }
 784
 785                 msleep(5);
 786                 gpio_set_value(tsdata->reset_pin, 1);
 787                 msleep(300);
 788         }
 789
 790         return 0;
 791 }
 792
 793 static int edt_ft5x06_ts_identify(struct i2c_client *client,
 794                                         struct edt_ft5x06_ts_data *tsdata,
 795                                         char *fw_version)
 796 {
 797         u8 rdbuf[EDT_NAME_LEN];
 798         char *p;
 799         int error;
 800         char *model_name = tsdata->name;
 801
 802         /* see what we find if we assume it is a M06 *
 803          * if we get less than EDT_NAME_LEN, we don't want
 804          * to have garbage in there
 805          */
 806         memset(rdbuf, 0, sizeof(rdbuf));
 807         error = edt_ft5x06_ts_readwrite(client, 1, "\xbb",
 808                                         EDT_NAME_LEN - 1, rdbuf);
 809         if (error)
 810                 return error;
 811
 812         /* if we find something consistent, stay with that assumption
 813          * at least M09 won't send 3 bytes here
 814          */
 815         if (!(strncasecmp(rdbuf + 1, "EP0", 3))) {
 816                 tsdata->version = M06;
 817
 818                 /* remove last '$' end marker */
 819                 rdbuf[EDT_NAME_LEN - 1] = '\0';
 820                 if (rdbuf[EDT_NAME_LEN - 2] == '$')
 821                         rdbuf[EDT_NAME_LEN - 2] = '\0';
 822
 823                 /* look for Model/Version separator */
 824                 p = strchr(rdbuf, '*');
 825                 if (p)
 826                         *p++ = '\0';
 827                 strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
 828                 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
 829         } else {
 830                 /* since there are only two versions around (M06, M09) */
 831                 tsdata->version = M09;
 832
 833                 error = edt_ft5x06_ts_readwrite(client, 1, "\xA6",
 834                                                 2, rdbuf);
 835                 if (error)
 836                         return error;
 837
 838                 strlcpy(fw_version, rdbuf, 2);
 839
 840                 error = edt_ft5x06_ts_readwrite(client, 1, "\xA8",
 841                                                 1, rdbuf);
 842                 if (error)
 843                         return error;
 844
 845                 snprintf(model_name, EDT_NAME_LEN, "EP0%i%i0M09",
 846                         rdbuf[0] >> 4, rdbuf[0] & 0x0F);
 847         }
 848
 849         return 0;
 850 }
 851
 852 #define EDT_ATTR_CHECKSET(name, reg) \
 853 do {                                                            \
 854         if (pdata->name >= edt_ft5x06_attr_##name.limit_low &&          \
 855             pdata->name <= edt_ft5x06_attr_##name.limit_high)           \
 856                 edt_ft5x06_register_write(tsdata, reg, pdata->name);    \
 857 } while (0)
 858
 859 #define EDT_GET_PROP(name, reg) {                               \
 860         u32 val;                                                \
 861         if (of_property_read_u32(np, #name, &val) == 0)         \
 862                 edt_ft5x06_register_write(tsdata, reg, val);    \
 863 }
 864
 865 static void edt_ft5x06_ts_get_dt_defaults(struct device_node *np,
 866                                         struct edt_ft5x06_ts_data *tsdata)
 867 {
 868         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 869
 870         EDT_GET_PROP(threshold, reg_addr->reg_threshold);
 871         EDT_GET_PROP(gain, reg_addr->reg_gain);
 872         EDT_GET_PROP(offset, reg_addr->reg_offset);
 873 }
 874
 875 static void
 876 edt_ft5x06_ts_get_defaults(struct edt_ft5x06_ts_data *tsdata,
 877                            const struct edt_ft5x06_platform_data *pdata)
 878 {
 879         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 880
 881         if (!pdata->use_parameters)
 882                 return;
 883
 884         /* pick up defaults from the platform data */
 885         EDT_ATTR_CHECKSET(threshold, reg_addr->reg_threshold);
 886         EDT_ATTR_CHECKSET(gain, reg_addr->reg_gain);
 887         EDT_ATTR_CHECKSET(offset, reg_addr->reg_offset);
 888         if (reg_addr->reg_report_rate != NO_REGISTER)
 889                 EDT_ATTR_CHECKSET(report_rate, reg_addr->reg_report_rate);
 890 }
 891
 892 static void
 893 edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
 894 {
 895         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 896
 897         tsdata->threshold = edt_ft5x06_register_read(tsdata,
 898                                                      reg_addr->reg_threshold);
 899         tsdata->gain = edt_ft5x06_register_read(tsdata, reg_addr->reg_gain);
 900         tsdata->offset = edt_ft5x06_register_read(tsdata, reg_addr->reg_offset);
 901         if (reg_addr->reg_report_rate != NO_REGISTER)
 902                 tsdata->report_rate = edt_ft5x06_register_read(tsdata,
 903                                                 reg_addr->reg_report_rate);
 904         tsdata->num_x = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_x);
 905         tsdata->num_y = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_y);
 906 }
 907
 908 static void
 909 edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
 910 {
 911         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 912
 913         switch (tsdata->version) {
 914         case M06:
 915                 reg_addr->reg_threshold = WORK_REGISTER_THRESHOLD;
 916                 reg_addr->reg_report_rate = WORK_REGISTER_REPORT_RATE;
 917                 reg_addr->reg_gain = WORK_REGISTER_GAIN;
 918                 reg_addr->reg_offset = WORK_REGISTER_OFFSET;
 919                 reg_addr->reg_num_x = WORK_REGISTER_NUM_X;
 920                 reg_addr->reg_num_y = WORK_REGISTER_NUM_Y;
 921                 break;
 922
 923         case M09:
 924                 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
 925                 reg_addr->reg_gain = M09_REGISTER_GAIN;
 926                 reg_addr->reg_offset = M09_REGISTER_OFFSET;
 927                 reg_addr->reg_num_x = M09_REGISTER_NUM_X;
 928                 reg_addr->reg_num_y = M09_REGISTER_NUM_Y;
 929                 break;
 930         }
 931 }
 932
 933 #ifdef CONFIG_OF
 934 static int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
 935                                 struct edt_ft5x06_ts_data *tsdata)
 936 {
 937         struct device_node *np = dev->of_node;
 938
 939         /*
 940          * irq_pin is not needed for DT setup.
 941          * irq is associated via 'interrupts' property in DT
 942          */
 943         tsdata->irq_pin = -EINVAL;
 944         tsdata->reset_pin = of_get_named_gpio(np, "reset-gpios", 0);
 945         tsdata->wake_pin = of_get_named_gpio(np, "wake-gpios", 0);
 946
 947         return 0;
 948 }
 949 #else
 950 static inline int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
 951                                         struct edt_ft5x06_ts_data *tsdata)
 952 {
 953         return -ENODEV;
 954 }
 955 #endif
 956
 957 static int edt_ft5x06_ts_probe(struct i2c_client *client,
 958                                          const struct i2c_device_id *id)
 959 {
 960         const struct edt_ft5x06_platform_data *pdata =
 961                                                 dev_get_platdata(&client->dev);
 962         struct edt_ft5x06_ts_data *tsdata;
 963         struct input_dev *input;
 964         int error;
 965         char fw_version[EDT_NAME_LEN];
 966
 967         dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");
 968
 969         tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
 970         if (!tsdata) {
 971                 dev_err(&client->dev, "failed to allocate driver data.\n");
 972                 return -ENOMEM;
 973         }
 974
 975         if (!pdata) {
 976                 error = edt_ft5x06_i2c_ts_probe_dt(&client->dev, tsdata);
 977                 if (error) {
 978                         dev_err(&client->dev,
 979                                 "DT probe failed and no platform data present\n");
 980                         return error;
 981                 }
 982         } else {
 983                 tsdata->reset_pin = pdata->reset_pin;
 984                 tsdata->irq_pin = pdata->irq_pin;
 985                 tsdata->wake_pin = -EINVAL;
 986         }
 987
 988         error = edt_ft5x06_ts_reset(client, tsdata);
 989         if (error)
 990                 return error;
 991
 992         if (gpio_is_valid(tsdata->irq_pin)) {
 993                 error = devm_gpio_request_one(&client->dev, tsdata->irq_pin,
 994                                         GPIOF_IN, "edt-ft5x06 irq");
 995                 if (error) {
 996                         dev_err(&client->dev,
 997                                 "Failed to request GPIO %d, error %d\n",
 998                                 tsdata->irq_pin, error);
 999                         return error;
1000                 }
1001         }
1002
1003         input = devm_input_allocate_device(&client->dev);
1004         if (!input) {
1005                 dev_err(&client->dev, "failed to allocate input device.\n");
1006                 return -ENOMEM;
1007         }
1008
1009         mutex_init(&tsdata->mutex);
1010         tsdata->client = client;
1011         tsdata->input = input;
1012         tsdata->factory_mode = false;
1013
1014         error = edt_ft5x06_ts_identify(client, tsdata, fw_version);
1015         if (error) {
1016                 dev_err(&client->dev, "touchscreen probe failed\n");
1017                 return error;
1018         }
1019
1020         edt_ft5x06_ts_set_regs(tsdata);
1021
1022         if (!pdata)
1023                 edt_ft5x06_ts_get_dt_defaults(client->dev.of_node, tsdata);
1024         else
1025                 edt_ft5x06_ts_get_defaults(tsdata, pdata);
1026
1027         edt_ft5x06_ts_get_parameters(tsdata);
1028
1029         dev_dbg(&client->dev,
1030                 "Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
1031                 tsdata->name, fw_version, tsdata->num_x, tsdata->num_y);
1032
1033         input->name = tsdata->name;
1034         input->id.bustype = BUS_I2C;
1035         input->dev.parent = &client->dev;
1036
1037         __set_bit(EV_SYN, input->evbit);
1038         __set_bit(EV_KEY, input->evbit);
1039         __set_bit(EV_ABS, input->evbit);
1040         __set_bit(BTN_TOUCH, input->keybit);
1041         input_set_abs_params(input, ABS_X, 0, tsdata->num_x * 64 - 1, 0, 0);
1042         input_set_abs_params(input, ABS_Y, 0, tsdata->num_y * 64 - 1, 0, 0);
1043         input_set_abs_params(input, ABS_MT_POSITION_X,
1044                              0, tsdata->num_x * 64 - 1, 0, 0);
1045         input_set_abs_params(input, ABS_MT_POSITION_Y,
1046                              0, tsdata->num_y * 64 - 1, 0, 0);
1047         error = input_mt_init_slots(input, MAX_SUPPORT_POINTS, 0);
1048         if (error) {
1049                 dev_err(&client->dev, "Unable to init MT slots.\n");
1050                 return error;
1051         }
1052
1053         input_set_drvdata(input, tsdata);
1054         i2c_set_clientdata(client, tsdata);
1055
1056         error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
1057                                         edt_ft5x06_ts_isr,
1058                                         IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
1059                                         client->name, tsdata);
1060         if (error) {
1061                 dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
1062                 return error;
1063         }
1064
1065         error = sysfs_create_group(&client->dev.kobj, &edt_ft5x06_attr_group);
1066         if (error)
1067                 return error;
1068
1069         error = input_register_device(input);
1070         if (error)
1071                 goto err_remove_attrs;
1072
1073         edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
1074         device_init_wakeup(&client->dev, 1);
1075
1076         dev_dbg(&client->dev,
1077                 "EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n",
1078                 client->irq, tsdata->wake_pin, tsdata->reset_pin);
1079
1080         return 0;
1081
1082 err_remove_attrs:
1083         sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
1084         return error;
1085 }
1086
1087 static int edt_ft5x06_ts_remove(struct i2c_client *client)
1088 {
1089         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1090
1091         edt_ft5x06_ts_teardown_debugfs(tsdata);
1092         sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
1093
1094         return 0;
1095 }
1096
1097 static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev)
1098 {
1099         struct i2c_client *client = to_i2c_client(dev);
1100
1101         if (device_may_wakeup(dev))
1102                 enable_irq_wake(client->irq);
1103
1104         return 0;
1105 }
1106
1107 static int __maybe_unused edt_ft5x06_ts_resume(struct device *dev)
1108 {
1109         struct i2c_client *client = to_i2c_client(dev);
1110
1111         if (device_may_wakeup(dev))
1112                 disable_irq_wake(client->irq);
1113
1114         return 0;
1115 }
1116
1117 static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
1118                          edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);
1119
1120 static const struct i2c_device_id edt_ft5x06_ts_id[] = {
1121         { "edt-ft5x06", 0, },
1122         { /* sentinel */ }
1123 };
1124 MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
1125
1126 #ifdef CONFIG_OF
1127 static const struct of_device_id edt_ft5x06_of_match[] = {
1128         { .compatible = "edt,edt-ft5206", },
1129         { .compatible = "edt,edt-ft5306", },
1130         { .compatible = "edt,edt-ft5406", },
1131         { /* sentinel */ }
1132 };
1133 MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match);
1134 #endif
1135
1136 static struct i2c_driver edt_ft5x06_ts_driver = {
1137         .driver = {
1138                 .owner = THIS_MODULE,
1139                 .name = "edt_ft5x06",
1140                 .of_match_table = of_match_ptr(edt_ft5x06_of_match),
1141                 .pm = &edt_ft5x06_ts_pm_ops,
1142         },
1143         .id_table = edt_ft5x06_ts_id,
1144         .probe    = edt_ft5x06_ts_probe,
1145         .remove   = edt_ft5x06_ts_remove,
1146 };
1147
1148 module_i2c_driver(edt_ft5x06_ts_driver);
1149
1150 MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>");
1151 MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
1152 MODULE_LICENSE("GPL");