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 reg_addr->reg_threshold = val; 827 828 error = device_property_read_u32(dev, "gain", &val); 829 if (!error) 830 reg_addr->reg_gain = val; 831 832 error = device_property_read_u32(dev, "offset", &val); 833 if (!error) 834 reg_addr->reg_offset = val; 835 } 836 837 static void 838 edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata) 839 { 840 struct edt_reg_addr *reg_addr = &tsdata->reg_addr; 841 842 tsdata->threshold = edt_ft5x06_register_read(tsdata, 843 reg_addr->reg_threshold); 844 tsdata->gain = edt_ft5x06_register_read(tsdata, reg_addr->reg_gain); 845 tsdata->offset = edt_ft5x06_register_read(tsdata, reg_addr->reg_offset); 846 if (reg_addr->reg_report_rate != NO_REGISTER) 847 tsdata->report_rate = edt_ft5x06_register_read(tsdata, 848 reg_addr->reg_report_rate); 849 tsdata->num_x = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_x); 850 tsdata->num_y = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_y); 851 } 852 853 static void 854 edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata) 855 { 856 struct edt_reg_addr *reg_addr = &tsdata->reg_addr; 857 858 switch (tsdata->version) { 859 case M06: 860 reg_addr->reg_threshold = WORK_REGISTER_THRESHOLD; 861 reg_addr->reg_report_rate = WORK_REGISTER_REPORT_RATE; 862 reg_addr->reg_gain = WORK_REGISTER_GAIN; 863 reg_addr->reg_offset = WORK_REGISTER_OFFSET; 864 reg_addr->reg_num_x = WORK_REGISTER_NUM_X; 865 reg_addr->reg_num_y = WORK_REGISTER_NUM_Y; 866 break; 867 868 case M09: 869 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD; 870 reg_addr->reg_gain = M09_REGISTER_GAIN; 871 reg_addr->reg_offset = M09_REGISTER_OFFSET; 872 reg_addr->reg_num_x = M09_REGISTER_NUM_X; 873 reg_addr->reg_num_y = M09_REGISTER_NUM_Y; 874 break; 875 } 876 } 877 878 static int edt_ft5x06_ts_probe(struct i2c_client *client, 879 const struct i2c_device_id *id) 880 { 881 const struct edt_i2c_chip_data *chip_data; 882 struct edt_ft5x06_ts_data *tsdata; 883 struct input_dev *input; 884 unsigned long irq_flags; 885 int error; 886 char fw_version[EDT_NAME_LEN]; 887 888 dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n"); 889 890 tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL); 891 if (!tsdata) { 892 dev_err(&client->dev, "failed to allocate driver data.\n"); 893 return -ENOMEM; 894 } 895 896 chip_data = of_device_get_match_data(&client->dev); 897 if (!chip_data) 898 chip_data = (const struct edt_i2c_chip_data *)id->driver_data; 899 if (!chip_data || !chip_data->max_support_points) { 900 dev_err(&client->dev, "invalid or missing chip data\n"); 901 return -EINVAL; 902 } 903 904 tsdata->max_support_points = chip_data->max_support_points; 905 906 tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev, 907 "reset", GPIOD_OUT_HIGH); 908 if (IS_ERR(tsdata->reset_gpio)) { 909 error = PTR_ERR(tsdata->reset_gpio); 910 dev_err(&client->dev, 911 "Failed to request GPIO reset pin, error %d\n", error); 912 return error; 913 } 914 915 tsdata->wake_gpio = devm_gpiod_get_optional(&client->dev, 916 "wake", GPIOD_OUT_LOW); 917 if (IS_ERR(tsdata->wake_gpio)) { 918 error = PTR_ERR(tsdata->wake_gpio); 919 dev_err(&client->dev, 920 "Failed to request GPIO wake pin, error %d\n", error); 921 return error; 922 } 923 924 if (tsdata->wake_gpio) { 925 usleep_range(5000, 6000); 926 gpiod_set_value_cansleep(tsdata->wake_gpio, 1); 927 } 928 929 if (tsdata->reset_gpio) { 930 usleep_range(5000, 6000); 931 gpiod_set_value_cansleep(tsdata->reset_gpio, 0); 932 msleep(300); 933 } 934 935 input = devm_input_allocate_device(&client->dev); 936 if (!input) { 937 dev_err(&client->dev, "failed to allocate input device.\n"); 938 return -ENOMEM; 939 } 940 941 mutex_init(&tsdata->mutex); 942 tsdata->client = client; 943 tsdata->input = input; 944 tsdata->factory_mode = false; 945 946 error = edt_ft5x06_ts_identify(client, tsdata, fw_version); 947 if (error) { 948 dev_err(&client->dev, "touchscreen probe failed\n"); 949 return error; 950 } 951 952 edt_ft5x06_ts_set_regs(tsdata); 953 edt_ft5x06_ts_get_defaults(&client->dev, tsdata); 954 edt_ft5x06_ts_get_parameters(tsdata); 955 956 dev_dbg(&client->dev, 957 "Model \"%s\", Rev. \"%s\", %dx%d sensors\n", 958 tsdata->name, fw_version, tsdata->num_x, tsdata->num_y); 959 960 input->name = tsdata->name; 961 input->id.bustype = BUS_I2C; 962 input->dev.parent = &client->dev; 963 964 input_set_abs_params(input, ABS_MT_POSITION_X, 965 0, tsdata->num_x * 64 - 1, 0, 0); 966 input_set_abs_params(input, ABS_MT_POSITION_Y, 967 0, tsdata->num_y * 64 - 1, 0, 0); 968 969 touchscreen_parse_properties(input, true); 970 971 error = input_mt_init_slots(input, tsdata->max_support_points, 972 INPUT_MT_DIRECT); 973 if (error) { 974 dev_err(&client->dev, "Unable to init MT slots.\n"); 975 return error; 976 } 977 978 input_set_drvdata(input, tsdata); 979 i2c_set_clientdata(client, tsdata); 980 981 irq_flags = irq_get_trigger_type(client->irq); 982 if (irq_flags == IRQF_TRIGGER_NONE) 983 irq_flags = IRQF_TRIGGER_FALLING; 984 irq_flags |= IRQF_ONESHOT; 985 986 error = devm_request_threaded_irq(&client->dev, client->irq, 987 NULL, edt_ft5x06_ts_isr, irq_flags, 988 client->name, tsdata); 989 if (error) { 990 dev_err(&client->dev, "Unable to request touchscreen IRQ.\n"); 991 return error; 992 } 993 994 error = sysfs_create_group(&client->dev.kobj, &edt_ft5x06_attr_group); 995 if (error) 996 return error; 997 998 error = input_register_device(input); 999 if (error) 1000 goto err_remove_attrs; 1001 1002 edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev)); 1003 device_init_wakeup(&client->dev, 1); 1004 1005 dev_dbg(&client->dev, 1006 "EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n", 1007 client->irq, 1008 tsdata->wake_gpio ? desc_to_gpio(tsdata->wake_gpio) : -1, 1009 tsdata->reset_gpio ? desc_to_gpio(tsdata->reset_gpio) : -1); 1010 1011 return 0; 1012 1013 err_remove_attrs: 1014 sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group); 1015 return error; 1016 } 1017 1018 static int edt_ft5x06_ts_remove(struct i2c_client *client) 1019 { 1020 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client); 1021 1022 edt_ft5x06_ts_teardown_debugfs(tsdata); 1023 sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group); 1024 1025 return 0; 1026 } 1027 1028 static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev) 1029 { 1030 struct i2c_client *client = to_i2c_client(dev); 1031 1032 if (device_may_wakeup(dev)) 1033 enable_irq_wake(client->irq); 1034 1035 return 0; 1036 } 1037 1038 static int __maybe_unused edt_ft5x06_ts_resume(struct device *dev) 1039 { 1040 struct i2c_client *client = to_i2c_client(dev); 1041 1042 if (device_may_wakeup(dev)) 1043 disable_irq_wake(client->irq); 1044 1045 return 0; 1046 } 1047 1048 static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops, 1049 edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume); 1050 1051 static const struct edt_i2c_chip_data edt_ft5x06_data = { 1052 .max_support_points = 5, 1053 }; 1054 1055 static const struct edt_i2c_chip_data edt_ft5506_data = { 1056 .max_support_points = 10, 1057 }; 1058 1059 static const struct i2c_device_id edt_ft5x06_ts_id[] = { 1060 { .name = "edt-ft5x06", .driver_data = (long)&edt_ft5x06_data }, 1061 { .name = "edt-ft5506", .driver_data = (long)&edt_ft5506_data }, 1062 { /* sentinel */ } 1063 }; 1064 MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id); 1065 1066 #ifdef CONFIG_OF 1067 static const struct of_device_id edt_ft5x06_of_match[] = { 1068 { .compatible = "edt,edt-ft5206", .data = &edt_ft5x06_data }, 1069 { .compatible = "edt,edt-ft5306", .data = &edt_ft5x06_data }, 1070 { .compatible = "edt,edt-ft5406", .data = &edt_ft5x06_data }, 1071 { .compatible = "edt,edt-ft5506", .data = &edt_ft5506_data }, 1072 { /* sentinel */ } 1073 }; 1074 MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match); 1075 #endif 1076 1077 static struct i2c_driver edt_ft5x06_ts_driver = { 1078 .driver = { 1079 .name = "edt_ft5x06", 1080 .of_match_table = of_match_ptr(edt_ft5x06_of_match), 1081 .pm = &edt_ft5x06_ts_pm_ops, 1082 }, 1083 .id_table = edt_ft5x06_ts_id, 1084 .probe = edt_ft5x06_ts_probe, 1085 .remove = edt_ft5x06_ts_remove, 1086 }; 1087 1088 module_i2c_driver(edt_ft5x06_ts_driver); 1089 1090 MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>"); 1091 MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver"); 1092 MODULE_LICENSE("GPL"); 1093