1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2012 Simon Budig, <simon.budig@kernelconcepts.de> 4 * Daniel Wagener <daniel.wagener@kernelconcepts.de> (M09 firmware support) 5 * Lothar Waßmann <LW@KARO-electronics.de> (DT support) 6 */ 7 8 /* 9 * This is a driver for the EDT "Polytouch" family of touch controllers 10 * based on the FocalTech FT5x06 line of chips. 11 * 12 * Development of this driver has been sponsored by Glyn: 13 * http://www.glyn.com/Products/Displays 14 */ 15 16 #include <linux/debugfs.h> 17 #include <linux/delay.h> 18 #include <linux/gpio/consumer.h> 19 #include <linux/i2c.h> 20 #include <linux/interrupt.h> 21 #include <linux/input.h> 22 #include <linux/input/mt.h> 23 #include <linux/input/touchscreen.h> 24 #include <linux/irq.h> 25 #include <linux/kernel.h> 26 #include <linux/module.h> 27 #include <linux/ratelimit.h> 28 #include <linux/regulator/consumer.h> 29 #include <linux/slab.h> 30 #include <linux/uaccess.h> 31 32 #include <asm/unaligned.h> 33 34 #define WORK_REGISTER_THRESHOLD 0x00 35 #define WORK_REGISTER_REPORT_RATE 0x08 36 #define WORK_REGISTER_GAIN 0x30 37 #define WORK_REGISTER_OFFSET 0x31 38 #define WORK_REGISTER_NUM_X 0x33 39 #define WORK_REGISTER_NUM_Y 0x34 40 41 #define PMOD_REGISTER_ACTIVE 0x00 42 #define PMOD_REGISTER_HIBERNATE 0x03 43 44 #define M09_REGISTER_THRESHOLD 0x80 45 #define M09_REGISTER_GAIN 0x92 46 #define M09_REGISTER_OFFSET 0x93 47 #define M09_REGISTER_NUM_X 0x94 48 #define M09_REGISTER_NUM_Y 0x95 49 50 #define EV_REGISTER_THRESHOLD 0x40 51 #define EV_REGISTER_GAIN 0x41 52 #define EV_REGISTER_OFFSET_Y 0x45 53 #define EV_REGISTER_OFFSET_X 0x46 54 55 #define NO_REGISTER 0xff 56 57 #define WORK_REGISTER_OPMODE 0x3c 58 #define FACTORY_REGISTER_OPMODE 0x01 59 #define PMOD_REGISTER_OPMODE 0xa5 60 61 #define TOUCH_EVENT_DOWN 0x00 62 #define TOUCH_EVENT_UP 0x01 63 #define TOUCH_EVENT_ON 0x02 64 #define TOUCH_EVENT_RESERVED 0x03 65 66 #define EDT_NAME_LEN 23 67 #define EDT_SWITCH_MODE_RETRIES 10 68 #define EDT_SWITCH_MODE_DELAY 5 /* msec */ 69 #define EDT_RAW_DATA_RETRIES 100 70 #define EDT_RAW_DATA_DELAY 1000 /* usec */ 71 72 #define EDT_DEFAULT_NUM_X 1024 73 #define EDT_DEFAULT_NUM_Y 1024 74 75 enum edt_pmode { 76 EDT_PMODE_NOT_SUPPORTED, 77 EDT_PMODE_HIBERNATE, 78 EDT_PMODE_POWEROFF, 79 }; 80 81 enum edt_ver { 82 EDT_M06, 83 EDT_M09, 84 EDT_M12, 85 EV_FT, 86 GENERIC_FT, 87 }; 88 89 struct edt_reg_addr { 90 int reg_threshold; 91 int reg_report_rate; 92 int reg_gain; 93 int reg_offset; 94 int reg_offset_x; 95 int reg_offset_y; 96 int reg_num_x; 97 int reg_num_y; 98 }; 99 100 struct edt_ft5x06_ts_data { 101 struct i2c_client *client; 102 struct input_dev *input; 103 struct touchscreen_properties prop; 104 u16 num_x; 105 u16 num_y; 106 struct regulator *vcc; 107 struct regulator *iovcc; 108 109 struct gpio_desc *reset_gpio; 110 struct gpio_desc *wake_gpio; 111 112 #if defined(CONFIG_DEBUG_FS) 113 struct dentry *debug_dir; 114 u8 *raw_buffer; 115 size_t raw_bufsize; 116 #endif 117 118 struct mutex mutex; 119 bool factory_mode; 120 enum edt_pmode suspend_mode; 121 int threshold; 122 int gain; 123 int offset; 124 int offset_x; 125 int offset_y; 126 int report_rate; 127 int max_support_points; 128 129 char name[EDT_NAME_LEN]; 130 131 struct edt_reg_addr reg_addr; 132 enum edt_ver version; 133 }; 134 135 struct edt_i2c_chip_data { 136 int max_support_points; 137 }; 138 139 static int edt_ft5x06_ts_readwrite(struct i2c_client *client, 140 u16 wr_len, u8 *wr_buf, 141 u16 rd_len, u8 *rd_buf) 142 { 143 struct i2c_msg wrmsg[2]; 144 int i = 0; 145 int ret; 146 147 if (wr_len) { 148 wrmsg[i].addr = client->addr; 149 wrmsg[i].flags = 0; 150 wrmsg[i].len = wr_len; 151 wrmsg[i].buf = wr_buf; 152 i++; 153 } 154 if (rd_len) { 155 wrmsg[i].addr = client->addr; 156 wrmsg[i].flags = I2C_M_RD; 157 wrmsg[i].len = rd_len; 158 wrmsg[i].buf = rd_buf; 159 i++; 160 } 161 162 ret = i2c_transfer(client->adapter, wrmsg, i); 163 if (ret < 0) 164 return ret; 165 if (ret != i) 166 return -EIO; 167 168 return 0; 169 } 170 171 static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata, 172 u8 *buf, int buflen) 173 { 174 int i; 175 u8 crc = 0; 176 177 for (i = 0; i < buflen - 1; i++) 178 crc ^= buf[i]; 179 180 if (crc != buf[buflen-1]) { 181 dev_err_ratelimited(&tsdata->client->dev, 182 "crc error: 0x%02x expected, got 0x%02x\n", 183 crc, buf[buflen-1]); 184 return false; 185 } 186 187 return true; 188 } 189 190 static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id) 191 { 192 struct edt_ft5x06_ts_data *tsdata = dev_id; 193 struct device *dev = &tsdata->client->dev; 194 u8 cmd; 195 u8 rdbuf[63]; 196 int i, type, x, y, id; 197 int offset, tplen, datalen, crclen; 198 int error; 199 200 switch (tsdata->version) { 201 case EDT_M06: 202 cmd = 0xf9; /* tell the controller to send touch data */ 203 offset = 5; /* where the actual touch data starts */ 204 tplen = 4; /* data comes in so called frames */ 205 crclen = 1; /* length of the crc data */ 206 break; 207 208 case EDT_M09: 209 case EDT_M12: 210 case EV_FT: 211 case GENERIC_FT: 212 cmd = 0x0; 213 offset = 3; 214 tplen = 6; 215 crclen = 0; 216 break; 217 218 default: 219 goto out; 220 } 221 222 memset(rdbuf, 0, sizeof(rdbuf)); 223 datalen = tplen * tsdata->max_support_points + offset + crclen; 224 225 error = edt_ft5x06_ts_readwrite(tsdata->client, 226 sizeof(cmd), &cmd, 227 datalen, rdbuf); 228 if (error) { 229 dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n", 230 error); 231 goto out; 232 } 233 234 /* M09/M12 does not send header or CRC */ 235 if (tsdata->version == EDT_M06) { 236 if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa || 237 rdbuf[2] != datalen) { 238 dev_err_ratelimited(dev, 239 "Unexpected header: %02x%02x%02x!\n", 240 rdbuf[0], rdbuf[1], rdbuf[2]); 241 goto out; 242 } 243 244 if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, datalen)) 245 goto out; 246 } 247 248 for (i = 0; i < tsdata->max_support_points; i++) { 249 u8 *buf = &rdbuf[i * tplen + offset]; 250 251 type = buf[0] >> 6; 252 /* ignore Reserved events */ 253 if (type == TOUCH_EVENT_RESERVED) 254 continue; 255 256 /* M06 sometimes sends bogus coordinates in TOUCH_DOWN */ 257 if (tsdata->version == EDT_M06 && type == TOUCH_EVENT_DOWN) 258 continue; 259 260 x = get_unaligned_be16(buf) & 0x0fff; 261 y = get_unaligned_be16(buf + 2) & 0x0fff; 262 /* The FT5x26 send the y coordinate first */ 263 if (tsdata->version == EV_FT) 264 swap(x, y); 265 266 id = (buf[2] >> 4) & 0x0f; 267 268 input_mt_slot(tsdata->input, id); 269 if (input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER, 270 type != TOUCH_EVENT_UP)) 271 touchscreen_report_pos(tsdata->input, &tsdata->prop, 272 x, y, true); 273 } 274 275 input_mt_report_pointer_emulation(tsdata->input, true); 276 input_sync(tsdata->input); 277 278 out: 279 return IRQ_HANDLED; 280 } 281 282 static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata, 283 u8 addr, u8 value) 284 { 285 u8 wrbuf[4]; 286 287 switch (tsdata->version) { 288 case EDT_M06: 289 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc; 290 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f; 291 wrbuf[2] = value; 292 wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2]; 293 return edt_ft5x06_ts_readwrite(tsdata->client, 4, 294 wrbuf, 0, NULL); 295 296 case EDT_M09: 297 case EDT_M12: 298 case EV_FT: 299 case GENERIC_FT: 300 wrbuf[0] = addr; 301 wrbuf[1] = value; 302 303 return edt_ft5x06_ts_readwrite(tsdata->client, 2, 304 wrbuf, 0, NULL); 305 306 default: 307 return -EINVAL; 308 } 309 } 310 311 static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata, 312 u8 addr) 313 { 314 u8 wrbuf[2], rdbuf[2]; 315 int error; 316 317 switch (tsdata->version) { 318 case EDT_M06: 319 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc; 320 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f; 321 wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40; 322 323 error = edt_ft5x06_ts_readwrite(tsdata->client, 2, wrbuf, 2, 324 rdbuf); 325 if (error) 326 return error; 327 328 if ((wrbuf[0] ^ wrbuf[1] ^ rdbuf[0]) != rdbuf[1]) { 329 dev_err(&tsdata->client->dev, 330 "crc error: 0x%02x expected, got 0x%02x\n", 331 wrbuf[0] ^ wrbuf[1] ^ rdbuf[0], 332 rdbuf[1]); 333 return -EIO; 334 } 335 break; 336 337 case EDT_M09: 338 case EDT_M12: 339 case EV_FT: 340 case GENERIC_FT: 341 wrbuf[0] = addr; 342 error = edt_ft5x06_ts_readwrite(tsdata->client, 1, 343 wrbuf, 1, rdbuf); 344 if (error) 345 return error; 346 break; 347 348 default: 349 return -EINVAL; 350 } 351 352 return rdbuf[0]; 353 } 354 355 struct edt_ft5x06_attribute { 356 struct device_attribute dattr; 357 size_t field_offset; 358 u8 limit_low; 359 u8 limit_high; 360 u8 addr_m06; 361 u8 addr_m09; 362 u8 addr_ev; 363 }; 364 365 #define EDT_ATTR(_field, _mode, _addr_m06, _addr_m09, _addr_ev, \ 366 _limit_low, _limit_high) \ 367 struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = { \ 368 .dattr = __ATTR(_field, _mode, \ 369 edt_ft5x06_setting_show, \ 370 edt_ft5x06_setting_store), \ 371 .field_offset = offsetof(struct edt_ft5x06_ts_data, _field), \ 372 .addr_m06 = _addr_m06, \ 373 .addr_m09 = _addr_m09, \ 374 .addr_ev = _addr_ev, \ 375 .limit_low = _limit_low, \ 376 .limit_high = _limit_high, \ 377 } 378 379 static ssize_t edt_ft5x06_setting_show(struct device *dev, 380 struct device_attribute *dattr, 381 char *buf) 382 { 383 struct i2c_client *client = to_i2c_client(dev); 384 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client); 385 struct edt_ft5x06_attribute *attr = 386 container_of(dattr, struct edt_ft5x06_attribute, dattr); 387 u8 *field = (u8 *)tsdata + attr->field_offset; 388 int val; 389 size_t count = 0; 390 int error = 0; 391 u8 addr; 392 393 mutex_lock(&tsdata->mutex); 394 395 if (tsdata->factory_mode) { 396 error = -EIO; 397 goto out; 398 } 399 400 switch (tsdata->version) { 401 case EDT_M06: 402 addr = attr->addr_m06; 403 break; 404 405 case EDT_M09: 406 case EDT_M12: 407 case GENERIC_FT: 408 addr = attr->addr_m09; 409 break; 410 411 case EV_FT: 412 addr = attr->addr_ev; 413 break; 414 415 default: 416 error = -ENODEV; 417 goto out; 418 } 419 420 if (addr != NO_REGISTER) { 421 val = edt_ft5x06_register_read(tsdata, addr); 422 if (val < 0) { 423 error = val; 424 dev_err(&tsdata->client->dev, 425 "Failed to fetch attribute %s, error %d\n", 426 dattr->attr.name, error); 427 goto out; 428 } 429 } else { 430 val = *field; 431 } 432 433 if (val != *field) { 434 dev_warn(&tsdata->client->dev, 435 "%s: read (%d) and stored value (%d) differ\n", 436 dattr->attr.name, val, *field); 437 *field = val; 438 } 439 440 count = scnprintf(buf, PAGE_SIZE, "%d\n", val); 441 out: 442 mutex_unlock(&tsdata->mutex); 443 return error ?: count; 444 } 445 446 static ssize_t edt_ft5x06_setting_store(struct device *dev, 447 struct device_attribute *dattr, 448 const char *buf, size_t count) 449 { 450 struct i2c_client *client = to_i2c_client(dev); 451 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client); 452 struct edt_ft5x06_attribute *attr = 453 container_of(dattr, struct edt_ft5x06_attribute, dattr); 454 u8 *field = (u8 *)tsdata + attr->field_offset; 455 unsigned int val; 456 int error; 457 u8 addr; 458 459 mutex_lock(&tsdata->mutex); 460 461 if (tsdata->factory_mode) { 462 error = -EIO; 463 goto out; 464 } 465 466 error = kstrtouint(buf, 0, &val); 467 if (error) 468 goto out; 469 470 if (val < attr->limit_low || val > attr->limit_high) { 471 error = -ERANGE; 472 goto out; 473 } 474 475 switch (tsdata->version) { 476 case EDT_M06: 477 addr = attr->addr_m06; 478 break; 479 480 case EDT_M09: 481 case EDT_M12: 482 case GENERIC_FT: 483 addr = attr->addr_m09; 484 break; 485 486 case EV_FT: 487 addr = attr->addr_ev; 488 break; 489 490 default: 491 error = -ENODEV; 492 goto out; 493 } 494 495 if (addr != NO_REGISTER) { 496 error = edt_ft5x06_register_write(tsdata, addr, val); 497 if (error) { 498 dev_err(&tsdata->client->dev, 499 "Failed to update attribute %s, error: %d\n", 500 dattr->attr.name, error); 501 goto out; 502 } 503 } 504 *field = val; 505 506 out: 507 mutex_unlock(&tsdata->mutex); 508 return error ?: count; 509 } 510 511 /* m06, m09: range 0-31, m12: range 0-5 */ 512 static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN, 513 M09_REGISTER_GAIN, EV_REGISTER_GAIN, 0, 31); 514 /* m06, m09: range 0-31, m12: range 0-16 */ 515 static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET, 516 M09_REGISTER_OFFSET, NO_REGISTER, 0, 31); 517 /* m06, m09, m12: no supported, ev_ft: range 0-80 */ 518 static EDT_ATTR(offset_x, S_IWUSR | S_IRUGO, NO_REGISTER, NO_REGISTER, 519 EV_REGISTER_OFFSET_X, 0, 80); 520 /* m06, m09, m12: no supported, ev_ft: range 0-80 */ 521 static EDT_ATTR(offset_y, S_IWUSR | S_IRUGO, NO_REGISTER, NO_REGISTER, 522 EV_REGISTER_OFFSET_Y, 0, 80); 523 /* m06: range 20 to 80, m09: range 0 to 30, m12: range 1 to 255... */ 524 static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD, 525 M09_REGISTER_THRESHOLD, EV_REGISTER_THRESHOLD, 0, 255); 526 /* m06: range 3 to 14, m12: (0x64: 100Hz) */ 527 static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE, 528 NO_REGISTER, NO_REGISTER, 0, 255); 529 530 static struct attribute *edt_ft5x06_attrs[] = { 531 &edt_ft5x06_attr_gain.dattr.attr, 532 &edt_ft5x06_attr_offset.dattr.attr, 533 &edt_ft5x06_attr_offset_x.dattr.attr, 534 &edt_ft5x06_attr_offset_y.dattr.attr, 535 &edt_ft5x06_attr_threshold.dattr.attr, 536 &edt_ft5x06_attr_report_rate.dattr.attr, 537 NULL 538 }; 539 540 static const struct attribute_group edt_ft5x06_attr_group = { 541 .attrs = edt_ft5x06_attrs, 542 }; 543 544 static void edt_ft5x06_restore_reg_parameters(struct edt_ft5x06_ts_data *tsdata) 545 { 546 struct edt_reg_addr *reg_addr = &tsdata->reg_addr; 547 548 edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold, 549 tsdata->threshold); 550 edt_ft5x06_register_write(tsdata, reg_addr->reg_gain, 551 tsdata->gain); 552 if (reg_addr->reg_offset != NO_REGISTER) 553 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset, 554 tsdata->offset); 555 if (reg_addr->reg_offset_x != NO_REGISTER) 556 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_x, 557 tsdata->offset_x); 558 if (reg_addr->reg_offset_y != NO_REGISTER) 559 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_y, 560 tsdata->offset_y); 561 if (reg_addr->reg_report_rate != NO_REGISTER) 562 edt_ft5x06_register_write(tsdata, reg_addr->reg_report_rate, 563 tsdata->report_rate); 564 565 } 566 567 #ifdef CONFIG_DEBUG_FS 568 static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata) 569 { 570 struct i2c_client *client = tsdata->client; 571 int retries = EDT_SWITCH_MODE_RETRIES; 572 int ret; 573 int error; 574 575 if (tsdata->version != EDT_M06) { 576 dev_err(&client->dev, 577 "No factory mode support for non-M06 devices\n"); 578 return -EINVAL; 579 } 580 581 disable_irq(client->irq); 582 583 if (!tsdata->raw_buffer) { 584 tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y * 585 sizeof(u16); 586 tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL); 587 if (!tsdata->raw_buffer) { 588 error = -ENOMEM; 589 goto err_out; 590 } 591 } 592 593 /* mode register is 0x3c when in the work mode */ 594 error = edt_ft5x06_register_write(tsdata, WORK_REGISTER_OPMODE, 0x03); 595 if (error) { 596 dev_err(&client->dev, 597 "failed to switch to factory mode, error %d\n", error); 598 goto err_out; 599 } 600 601 tsdata->factory_mode = true; 602 do { 603 mdelay(EDT_SWITCH_MODE_DELAY); 604 /* mode register is 0x01 when in factory mode */ 605 ret = edt_ft5x06_register_read(tsdata, FACTORY_REGISTER_OPMODE); 606 if (ret == 0x03) 607 break; 608 } while (--retries > 0); 609 610 if (retries == 0) { 611 dev_err(&client->dev, "not in factory mode after %dms.\n", 612 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY); 613 error = -EIO; 614 goto err_out; 615 } 616 617 return 0; 618 619 err_out: 620 kfree(tsdata->raw_buffer); 621 tsdata->raw_buffer = NULL; 622 tsdata->factory_mode = false; 623 enable_irq(client->irq); 624 625 return error; 626 } 627 628 static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata) 629 { 630 struct i2c_client *client = tsdata->client; 631 int retries = EDT_SWITCH_MODE_RETRIES; 632 int ret; 633 int error; 634 635 /* mode register is 0x01 when in the factory mode */ 636 error = edt_ft5x06_register_write(tsdata, FACTORY_REGISTER_OPMODE, 0x1); 637 if (error) { 638 dev_err(&client->dev, 639 "failed to switch to work mode, error: %d\n", error); 640 return error; 641 } 642 643 tsdata->factory_mode = false; 644 645 do { 646 mdelay(EDT_SWITCH_MODE_DELAY); 647 /* mode register is 0x01 when in factory mode */ 648 ret = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OPMODE); 649 if (ret == 0x01) 650 break; 651 } while (--retries > 0); 652 653 if (retries == 0) { 654 dev_err(&client->dev, "not in work mode after %dms.\n", 655 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY); 656 tsdata->factory_mode = true; 657 return -EIO; 658 } 659 660 kfree(tsdata->raw_buffer); 661 tsdata->raw_buffer = NULL; 662 663 edt_ft5x06_restore_reg_parameters(tsdata); 664 enable_irq(client->irq); 665 666 return 0; 667 } 668 669 static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode) 670 { 671 struct edt_ft5x06_ts_data *tsdata = data; 672 673 *mode = tsdata->factory_mode; 674 675 return 0; 676 }; 677 678 static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode) 679 { 680 struct edt_ft5x06_ts_data *tsdata = data; 681 int retval = 0; 682 683 if (mode > 1) 684 return -ERANGE; 685 686 mutex_lock(&tsdata->mutex); 687 688 if (mode != tsdata->factory_mode) { 689 retval = mode ? edt_ft5x06_factory_mode(tsdata) : 690 edt_ft5x06_work_mode(tsdata); 691 } 692 693 mutex_unlock(&tsdata->mutex); 694 695 return retval; 696 }; 697 698 DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get, 699 edt_ft5x06_debugfs_mode_set, "%llu\n"); 700 701 static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file, 702 char __user *buf, size_t count, loff_t *off) 703 { 704 struct edt_ft5x06_ts_data *tsdata = file->private_data; 705 struct i2c_client *client = tsdata->client; 706 int retries = EDT_RAW_DATA_RETRIES; 707 int val, i, error; 708 size_t read = 0; 709 int colbytes; 710 char wrbuf[3]; 711 u8 *rdbuf; 712 713 if (*off < 0 || *off >= tsdata->raw_bufsize) 714 return 0; 715 716 mutex_lock(&tsdata->mutex); 717 718 if (!tsdata->factory_mode || !tsdata->raw_buffer) { 719 error = -EIO; 720 goto out; 721 } 722 723 error = edt_ft5x06_register_write(tsdata, 0x08, 0x01); 724 if (error) { 725 dev_dbg(&client->dev, 726 "failed to write 0x08 register, error %d\n", error); 727 goto out; 728 } 729 730 do { 731 usleep_range(EDT_RAW_DATA_DELAY, EDT_RAW_DATA_DELAY + 100); 732 val = edt_ft5x06_register_read(tsdata, 0x08); 733 if (val < 1) 734 break; 735 } while (--retries > 0); 736 737 if (val < 0) { 738 error = val; 739 dev_dbg(&client->dev, 740 "failed to read 0x08 register, error %d\n", error); 741 goto out; 742 } 743 744 if (retries == 0) { 745 dev_dbg(&client->dev, 746 "timed out waiting for register to settle\n"); 747 error = -ETIMEDOUT; 748 goto out; 749 } 750 751 rdbuf = tsdata->raw_buffer; 752 colbytes = tsdata->num_y * sizeof(u16); 753 754 wrbuf[0] = 0xf5; 755 wrbuf[1] = 0x0e; 756 for (i = 0; i < tsdata->num_x; i++) { 757 wrbuf[2] = i; /* column index */ 758 error = edt_ft5x06_ts_readwrite(tsdata->client, 759 sizeof(wrbuf), wrbuf, 760 colbytes, rdbuf); 761 if (error) 762 goto out; 763 764 rdbuf += colbytes; 765 } 766 767 read = min_t(size_t, count, tsdata->raw_bufsize - *off); 768 if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) { 769 error = -EFAULT; 770 goto out; 771 } 772 773 *off += read; 774 out: 775 mutex_unlock(&tsdata->mutex); 776 return error ?: read; 777 }; 778 779 static const struct file_operations debugfs_raw_data_fops = { 780 .open = simple_open, 781 .read = edt_ft5x06_debugfs_raw_data_read, 782 }; 783 784 static void edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata, 785 const char *debugfs_name) 786 { 787 tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL); 788 789 debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x); 790 debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y); 791 792 debugfs_create_file("mode", S_IRUSR | S_IWUSR, 793 tsdata->debug_dir, tsdata, &debugfs_mode_fops); 794 debugfs_create_file("raw_data", S_IRUSR, 795 tsdata->debug_dir, tsdata, &debugfs_raw_data_fops); 796 } 797 798 static void edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata) 799 { 800 debugfs_remove_recursive(tsdata->debug_dir); 801 kfree(tsdata->raw_buffer); 802 } 803 804 #else 805 806 static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata) 807 { 808 return -ENOSYS; 809 } 810 811 static void edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata, 812 const char *debugfs_name) 813 { 814 } 815 816 static void edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata) 817 { 818 } 819 820 #endif /* CONFIG_DEBUGFS */ 821 822 static int edt_ft5x06_ts_identify(struct i2c_client *client, 823 struct edt_ft5x06_ts_data *tsdata, 824 char *fw_version) 825 { 826 u8 rdbuf[EDT_NAME_LEN]; 827 char *p; 828 int error; 829 char *model_name = tsdata->name; 830 831 /* see what we find if we assume it is a M06 * 832 * if we get less than EDT_NAME_LEN, we don't want 833 * to have garbage in there 834 */ 835 memset(rdbuf, 0, sizeof(rdbuf)); 836 error = edt_ft5x06_ts_readwrite(client, 1, "\xBB", 837 EDT_NAME_LEN - 1, rdbuf); 838 if (error) 839 return error; 840 841 /* Probe content for something consistent. 842 * M06 starts with a response byte, M12 gives the data directly. 843 * M09/Generic does not provide model number information. 844 */ 845 if (!strncasecmp(rdbuf + 1, "EP0", 3)) { 846 tsdata->version = EDT_M06; 847 848 /* remove last '$' end marker */ 849 rdbuf[EDT_NAME_LEN - 1] = '\0'; 850 if (rdbuf[EDT_NAME_LEN - 2] == '$') 851 rdbuf[EDT_NAME_LEN - 2] = '\0'; 852 853 /* look for Model/Version separator */ 854 p = strchr(rdbuf, '*'); 855 if (p) 856 *p++ = '\0'; 857 strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN); 858 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN); 859 } else if (!strncasecmp(rdbuf, "EP0", 3)) { 860 tsdata->version = EDT_M12; 861 862 /* remove last '$' end marker */ 863 rdbuf[EDT_NAME_LEN - 2] = '\0'; 864 if (rdbuf[EDT_NAME_LEN - 3] == '$') 865 rdbuf[EDT_NAME_LEN - 3] = '\0'; 866 867 /* look for Model/Version separator */ 868 p = strchr(rdbuf, '*'); 869 if (p) 870 *p++ = '\0'; 871 strlcpy(model_name, rdbuf, EDT_NAME_LEN); 872 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN); 873 } else { 874 /* If it is not an EDT M06/M12 touchscreen, then the model 875 * detection is a bit hairy. The different ft5x06 876 * firmares around don't reliably implement the 877 * identification registers. Well, we'll take a shot. 878 * 879 * The main difference between generic focaltec based 880 * touches and EDT M09 is that we know how to retrieve 881 * the max coordinates for the latter. 882 */ 883 tsdata->version = GENERIC_FT; 884 885 error = edt_ft5x06_ts_readwrite(client, 1, "\xA6", 886 2, rdbuf); 887 if (error) 888 return error; 889 890 strlcpy(fw_version, rdbuf, 2); 891 892 error = edt_ft5x06_ts_readwrite(client, 1, "\xA8", 893 1, rdbuf); 894 if (error) 895 return error; 896 897 /* This "model identification" is not exact. Unfortunately 898 * not all firmwares for the ft5x06 put useful values in 899 * the identification registers. 900 */ 901 switch (rdbuf[0]) { 902 case 0x11: /* EDT EP0110M09 */ 903 case 0x35: /* EDT EP0350M09 */ 904 case 0x43: /* EDT EP0430M09 */ 905 case 0x50: /* EDT EP0500M09 */ 906 case 0x57: /* EDT EP0570M09 */ 907 case 0x70: /* EDT EP0700M09 */ 908 tsdata->version = EDT_M09; 909 snprintf(model_name, EDT_NAME_LEN, "EP0%i%i0M09", 910 rdbuf[0] >> 4, rdbuf[0] & 0x0F); 911 break; 912 case 0xa1: /* EDT EP1010ML00 */ 913 tsdata->version = EDT_M09; 914 snprintf(model_name, EDT_NAME_LEN, "EP%i%i0ML00", 915 rdbuf[0] >> 4, rdbuf[0] & 0x0F); 916 break; 917 case 0x5a: /* Solomon Goldentek Display */ 918 snprintf(model_name, EDT_NAME_LEN, "GKTW50SCED1R0"); 919 break; 920 case 0x59: /* Evervision Display with FT5xx6 TS */ 921 tsdata->version = EV_FT; 922 error = edt_ft5x06_ts_readwrite(client, 1, "\x53", 923 1, rdbuf); 924 if (error) 925 return error; 926 strlcpy(fw_version, rdbuf, 1); 927 snprintf(model_name, EDT_NAME_LEN, 928 "EVERVISION-FT5726NEi"); 929 break; 930 default: 931 snprintf(model_name, EDT_NAME_LEN, 932 "generic ft5x06 (%02x)", 933 rdbuf[0]); 934 break; 935 } 936 } 937 938 return 0; 939 } 940 941 static void edt_ft5x06_ts_get_defaults(struct device *dev, 942 struct edt_ft5x06_ts_data *tsdata) 943 { 944 struct edt_reg_addr *reg_addr = &tsdata->reg_addr; 945 u32 val; 946 int error; 947 948 error = device_property_read_u32(dev, "threshold", &val); 949 if (!error) { 950 edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold, val); 951 tsdata->threshold = val; 952 } 953 954 error = device_property_read_u32(dev, "gain", &val); 955 if (!error) { 956 edt_ft5x06_register_write(tsdata, reg_addr->reg_gain, val); 957 tsdata->gain = val; 958 } 959 960 error = device_property_read_u32(dev, "offset", &val); 961 if (!error) { 962 if (reg_addr->reg_offset != NO_REGISTER) 963 edt_ft5x06_register_write(tsdata, 964 reg_addr->reg_offset, val); 965 tsdata->offset = val; 966 } 967 968 error = device_property_read_u32(dev, "offset-x", &val); 969 if (!error) { 970 if (reg_addr->reg_offset_x != NO_REGISTER) 971 edt_ft5x06_register_write(tsdata, 972 reg_addr->reg_offset_x, val); 973 tsdata->offset_x = val; 974 } 975 976 error = device_property_read_u32(dev, "offset-y", &val); 977 if (!error) { 978 if (reg_addr->reg_offset_y != NO_REGISTER) 979 edt_ft5x06_register_write(tsdata, 980 reg_addr->reg_offset_y, val); 981 tsdata->offset_y = val; 982 } 983 } 984 985 static void edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata) 986 { 987 struct edt_reg_addr *reg_addr = &tsdata->reg_addr; 988 989 tsdata->threshold = edt_ft5x06_register_read(tsdata, 990 reg_addr->reg_threshold); 991 tsdata->gain = edt_ft5x06_register_read(tsdata, reg_addr->reg_gain); 992 if (reg_addr->reg_offset != NO_REGISTER) 993 tsdata->offset = 994 edt_ft5x06_register_read(tsdata, reg_addr->reg_offset); 995 if (reg_addr->reg_offset_x != NO_REGISTER) 996 tsdata->offset_x = edt_ft5x06_register_read(tsdata, 997 reg_addr->reg_offset_x); 998 if (reg_addr->reg_offset_y != NO_REGISTER) 999 tsdata->offset_y = edt_ft5x06_register_read(tsdata, 1000 reg_addr->reg_offset_y); 1001 if (reg_addr->reg_report_rate != NO_REGISTER) 1002 tsdata->report_rate = edt_ft5x06_register_read(tsdata, 1003 reg_addr->reg_report_rate); 1004 tsdata->num_x = EDT_DEFAULT_NUM_X; 1005 if (reg_addr->reg_num_x != NO_REGISTER) 1006 tsdata->num_x = edt_ft5x06_register_read(tsdata, 1007 reg_addr->reg_num_x); 1008 tsdata->num_y = EDT_DEFAULT_NUM_Y; 1009 if (reg_addr->reg_num_y != NO_REGISTER) 1010 tsdata->num_y = edt_ft5x06_register_read(tsdata, 1011 reg_addr->reg_num_y); 1012 } 1013 1014 static void edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata) 1015 { 1016 struct edt_reg_addr *reg_addr = &tsdata->reg_addr; 1017 1018 switch (tsdata->version) { 1019 case EDT_M06: 1020 reg_addr->reg_threshold = WORK_REGISTER_THRESHOLD; 1021 reg_addr->reg_report_rate = WORK_REGISTER_REPORT_RATE; 1022 reg_addr->reg_gain = WORK_REGISTER_GAIN; 1023 reg_addr->reg_offset = WORK_REGISTER_OFFSET; 1024 reg_addr->reg_offset_x = NO_REGISTER; 1025 reg_addr->reg_offset_y = NO_REGISTER; 1026 reg_addr->reg_num_x = WORK_REGISTER_NUM_X; 1027 reg_addr->reg_num_y = WORK_REGISTER_NUM_Y; 1028 break; 1029 1030 case EDT_M09: 1031 case EDT_M12: 1032 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD; 1033 reg_addr->reg_report_rate = NO_REGISTER; 1034 reg_addr->reg_gain = M09_REGISTER_GAIN; 1035 reg_addr->reg_offset = M09_REGISTER_OFFSET; 1036 reg_addr->reg_offset_x = NO_REGISTER; 1037 reg_addr->reg_offset_y = NO_REGISTER; 1038 reg_addr->reg_num_x = M09_REGISTER_NUM_X; 1039 reg_addr->reg_num_y = M09_REGISTER_NUM_Y; 1040 break; 1041 1042 case EV_FT: 1043 reg_addr->reg_threshold = EV_REGISTER_THRESHOLD; 1044 reg_addr->reg_report_rate = NO_REGISTER; 1045 reg_addr->reg_gain = EV_REGISTER_GAIN; 1046 reg_addr->reg_offset = NO_REGISTER; 1047 reg_addr->reg_offset_x = EV_REGISTER_OFFSET_X; 1048 reg_addr->reg_offset_y = EV_REGISTER_OFFSET_Y; 1049 reg_addr->reg_num_x = NO_REGISTER; 1050 reg_addr->reg_num_y = NO_REGISTER; 1051 break; 1052 1053 case GENERIC_FT: 1054 /* this is a guesswork */ 1055 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD; 1056 reg_addr->reg_report_rate = NO_REGISTER; 1057 reg_addr->reg_gain = M09_REGISTER_GAIN; 1058 reg_addr->reg_offset = M09_REGISTER_OFFSET; 1059 reg_addr->reg_offset_x = NO_REGISTER; 1060 reg_addr->reg_offset_y = NO_REGISTER; 1061 reg_addr->reg_num_x = NO_REGISTER; 1062 reg_addr->reg_num_y = NO_REGISTER; 1063 break; 1064 } 1065 } 1066 1067 static void edt_ft5x06_disable_regulators(void *arg) 1068 { 1069 struct edt_ft5x06_ts_data *data = arg; 1070 1071 regulator_disable(data->vcc); 1072 regulator_disable(data->iovcc); 1073 } 1074 1075 static int edt_ft5x06_ts_probe(struct i2c_client *client, 1076 const struct i2c_device_id *id) 1077 { 1078 const struct edt_i2c_chip_data *chip_data; 1079 struct edt_ft5x06_ts_data *tsdata; 1080 u8 buf[2] = { 0xfc, 0x00 }; 1081 struct input_dev *input; 1082 unsigned long irq_flags; 1083 int error; 1084 char fw_version[EDT_NAME_LEN]; 1085 1086 dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n"); 1087 1088 tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL); 1089 if (!tsdata) { 1090 dev_err(&client->dev, "failed to allocate driver data.\n"); 1091 return -ENOMEM; 1092 } 1093 1094 chip_data = device_get_match_data(&client->dev); 1095 if (!chip_data) 1096 chip_data = (const struct edt_i2c_chip_data *)id->driver_data; 1097 if (!chip_data || !chip_data->max_support_points) { 1098 dev_err(&client->dev, "invalid or missing chip data\n"); 1099 return -EINVAL; 1100 } 1101 1102 tsdata->max_support_points = chip_data->max_support_points; 1103 1104 tsdata->vcc = devm_regulator_get(&client->dev, "vcc"); 1105 if (IS_ERR(tsdata->vcc)) { 1106 error = PTR_ERR(tsdata->vcc); 1107 if (error != -EPROBE_DEFER) 1108 dev_err(&client->dev, 1109 "failed to request regulator: %d\n", error); 1110 return error; 1111 } 1112 1113 tsdata->iovcc = devm_regulator_get(&client->dev, "iovcc"); 1114 if (IS_ERR(tsdata->iovcc)) { 1115 error = PTR_ERR(tsdata->iovcc); 1116 if (error != -EPROBE_DEFER) 1117 dev_err(&client->dev, 1118 "failed to request iovcc regulator: %d\n", error); 1119 return error; 1120 } 1121 1122 error = regulator_enable(tsdata->iovcc); 1123 if (error < 0) { 1124 dev_err(&client->dev, "failed to enable iovcc: %d\n", error); 1125 return error; 1126 } 1127 1128 /* Delay enabling VCC for > 10us (T_ivd) after IOVCC */ 1129 usleep_range(10, 100); 1130 1131 error = regulator_enable(tsdata->vcc); 1132 if (error < 0) { 1133 dev_err(&client->dev, "failed to enable vcc: %d\n", error); 1134 regulator_disable(tsdata->iovcc); 1135 return error; 1136 } 1137 1138 error = devm_add_action_or_reset(&client->dev, 1139 edt_ft5x06_disable_regulators, 1140 tsdata); 1141 if (error) 1142 return error; 1143 1144 tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev, 1145 "reset", GPIOD_OUT_HIGH); 1146 if (IS_ERR(tsdata->reset_gpio)) { 1147 error = PTR_ERR(tsdata->reset_gpio); 1148 dev_err(&client->dev, 1149 "Failed to request GPIO reset pin, error %d\n", error); 1150 return error; 1151 } 1152 1153 tsdata->wake_gpio = devm_gpiod_get_optional(&client->dev, 1154 "wake", GPIOD_OUT_LOW); 1155 if (IS_ERR(tsdata->wake_gpio)) { 1156 error = PTR_ERR(tsdata->wake_gpio); 1157 dev_err(&client->dev, 1158 "Failed to request GPIO wake pin, error %d\n", error); 1159 return error; 1160 } 1161 1162 /* 1163 * Check which sleep modes we can support. Power-off requieres the 1164 * reset-pin to ensure correct power-down/power-up behaviour. Start with 1165 * the EDT_PMODE_POWEROFF test since this is the deepest possible sleep 1166 * mode. 1167 */ 1168 if (tsdata->reset_gpio) 1169 tsdata->suspend_mode = EDT_PMODE_POWEROFF; 1170 else if (tsdata->wake_gpio) 1171 tsdata->suspend_mode = EDT_PMODE_HIBERNATE; 1172 else 1173 tsdata->suspend_mode = EDT_PMODE_NOT_SUPPORTED; 1174 1175 if (tsdata->wake_gpio) { 1176 usleep_range(5000, 6000); 1177 gpiod_set_value_cansleep(tsdata->wake_gpio, 1); 1178 } 1179 1180 if (tsdata->reset_gpio) { 1181 usleep_range(5000, 6000); 1182 gpiod_set_value_cansleep(tsdata->reset_gpio, 0); 1183 msleep(300); 1184 } 1185 1186 input = devm_input_allocate_device(&client->dev); 1187 if (!input) { 1188 dev_err(&client->dev, "failed to allocate input device.\n"); 1189 return -ENOMEM; 1190 } 1191 1192 mutex_init(&tsdata->mutex); 1193 tsdata->client = client; 1194 tsdata->input = input; 1195 tsdata->factory_mode = false; 1196 1197 error = edt_ft5x06_ts_identify(client, tsdata, fw_version); 1198 if (error) { 1199 dev_err(&client->dev, "touchscreen probe failed\n"); 1200 return error; 1201 } 1202 1203 /* 1204 * Dummy read access. EP0700MLP1 returns bogus data on the first 1205 * register read access and ignores writes. 1206 */ 1207 edt_ft5x06_ts_readwrite(tsdata->client, 2, buf, 2, buf); 1208 1209 edt_ft5x06_ts_set_regs(tsdata); 1210 edt_ft5x06_ts_get_defaults(&client->dev, tsdata); 1211 edt_ft5x06_ts_get_parameters(tsdata); 1212 1213 dev_dbg(&client->dev, 1214 "Model \"%s\", Rev. \"%s\", %dx%d sensors\n", 1215 tsdata->name, fw_version, tsdata->num_x, tsdata->num_y); 1216 1217 input->name = tsdata->name; 1218 input->id.bustype = BUS_I2C; 1219 input->dev.parent = &client->dev; 1220 1221 input_set_abs_params(input, ABS_MT_POSITION_X, 1222 0, tsdata->num_x * 64 - 1, 0, 0); 1223 input_set_abs_params(input, ABS_MT_POSITION_Y, 1224 0, tsdata->num_y * 64 - 1, 0, 0); 1225 1226 touchscreen_parse_properties(input, true, &tsdata->prop); 1227 1228 error = input_mt_init_slots(input, tsdata->max_support_points, 1229 INPUT_MT_DIRECT); 1230 if (error) { 1231 dev_err(&client->dev, "Unable to init MT slots.\n"); 1232 return error; 1233 } 1234 1235 i2c_set_clientdata(client, tsdata); 1236 1237 irq_flags = irq_get_trigger_type(client->irq); 1238 if (irq_flags == IRQF_TRIGGER_NONE) 1239 irq_flags = IRQF_TRIGGER_FALLING; 1240 irq_flags |= IRQF_ONESHOT; 1241 1242 error = devm_request_threaded_irq(&client->dev, client->irq, 1243 NULL, edt_ft5x06_ts_isr, irq_flags, 1244 client->name, tsdata); 1245 if (error) { 1246 dev_err(&client->dev, "Unable to request touchscreen IRQ.\n"); 1247 return error; 1248 } 1249 1250 error = devm_device_add_group(&client->dev, &edt_ft5x06_attr_group); 1251 if (error) 1252 return error; 1253 1254 error = input_register_device(input); 1255 if (error) 1256 return error; 1257 1258 edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev)); 1259 1260 dev_dbg(&client->dev, 1261 "EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n", 1262 client->irq, 1263 tsdata->wake_gpio ? desc_to_gpio(tsdata->wake_gpio) : -1, 1264 tsdata->reset_gpio ? desc_to_gpio(tsdata->reset_gpio) : -1); 1265 1266 return 0; 1267 } 1268 1269 static int edt_ft5x06_ts_remove(struct i2c_client *client) 1270 { 1271 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client); 1272 1273 edt_ft5x06_ts_teardown_debugfs(tsdata); 1274 1275 return 0; 1276 } 1277 1278 static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev) 1279 { 1280 struct i2c_client *client = to_i2c_client(dev); 1281 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client); 1282 struct gpio_desc *reset_gpio = tsdata->reset_gpio; 1283 int ret; 1284 1285 if (device_may_wakeup(dev)) 1286 return 0; 1287 1288 if (tsdata->suspend_mode == EDT_PMODE_NOT_SUPPORTED) 1289 return 0; 1290 1291 /* Enter hibernate mode. */ 1292 ret = edt_ft5x06_register_write(tsdata, PMOD_REGISTER_OPMODE, 1293 PMOD_REGISTER_HIBERNATE); 1294 if (ret) 1295 dev_warn(dev, "Failed to set hibernate mode\n"); 1296 1297 if (tsdata->suspend_mode == EDT_PMODE_HIBERNATE) 1298 return 0; 1299 1300 /* 1301 * Power-off according the datasheet. Cut the power may leaf the irq 1302 * line in an undefined state depending on the host pull resistor 1303 * settings. Disable the irq to avoid adjusting each host till the 1304 * device is back in a full functional state. 1305 */ 1306 disable_irq(tsdata->client->irq); 1307 1308 gpiod_set_value_cansleep(reset_gpio, 1); 1309 usleep_range(1000, 2000); 1310 1311 ret = regulator_disable(tsdata->vcc); 1312 if (ret) 1313 dev_warn(dev, "Failed to disable vcc\n"); 1314 ret = regulator_disable(tsdata->iovcc); 1315 if (ret) 1316 dev_warn(dev, "Failed to disable iovcc\n"); 1317 1318 return 0; 1319 } 1320 1321 static int __maybe_unused edt_ft5x06_ts_resume(struct device *dev) 1322 { 1323 struct i2c_client *client = to_i2c_client(dev); 1324 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client); 1325 int ret = 0; 1326 1327 if (device_may_wakeup(dev)) 1328 return 0; 1329 1330 if (tsdata->suspend_mode == EDT_PMODE_NOT_SUPPORTED) 1331 return 0; 1332 1333 if (tsdata->suspend_mode == EDT_PMODE_POWEROFF) { 1334 struct gpio_desc *reset_gpio = tsdata->reset_gpio; 1335 1336 /* 1337 * We can't check if the regulator is a dummy or a real 1338 * regulator. So we need to specify the 5ms reset time (T_rst) 1339 * here instead of the 100us T_rtp time. We also need to wait 1340 * 300ms in case it was a real supply and the power was cutted 1341 * of. Toggle the reset pin is also a way to exit the hibernate 1342 * mode. 1343 */ 1344 gpiod_set_value_cansleep(reset_gpio, 1); 1345 usleep_range(5000, 6000); 1346 1347 ret = regulator_enable(tsdata->iovcc); 1348 if (ret) { 1349 dev_err(dev, "Failed to enable iovcc\n"); 1350 return ret; 1351 } 1352 1353 /* Delay enabling VCC for > 10us (T_ivd) after IOVCC */ 1354 usleep_range(10, 100); 1355 1356 ret = regulator_enable(tsdata->vcc); 1357 if (ret) { 1358 dev_err(dev, "Failed to enable vcc\n"); 1359 regulator_disable(tsdata->iovcc); 1360 return ret; 1361 } 1362 1363 usleep_range(1000, 2000); 1364 gpiod_set_value_cansleep(reset_gpio, 0); 1365 msleep(300); 1366 1367 edt_ft5x06_restore_reg_parameters(tsdata); 1368 enable_irq(tsdata->client->irq); 1369 1370 if (tsdata->factory_mode) 1371 ret = edt_ft5x06_factory_mode(tsdata); 1372 } else { 1373 struct gpio_desc *wake_gpio = tsdata->wake_gpio; 1374 1375 gpiod_set_value_cansleep(wake_gpio, 0); 1376 usleep_range(5000, 6000); 1377 gpiod_set_value_cansleep(wake_gpio, 1); 1378 } 1379 1380 1381 return ret; 1382 } 1383 1384 static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops, 1385 edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume); 1386 1387 static const struct edt_i2c_chip_data edt_ft5x06_data = { 1388 .max_support_points = 5, 1389 }; 1390 1391 static const struct edt_i2c_chip_data edt_ft5506_data = { 1392 .max_support_points = 10, 1393 }; 1394 1395 static const struct edt_i2c_chip_data edt_ft6236_data = { 1396 .max_support_points = 2, 1397 }; 1398 1399 static const struct i2c_device_id edt_ft5x06_ts_id[] = { 1400 { .name = "edt-ft5x06", .driver_data = (long)&edt_ft5x06_data }, 1401 { .name = "edt-ft5506", .driver_data = (long)&edt_ft5506_data }, 1402 { .name = "ev-ft5726", .driver_data = (long)&edt_ft5506_data }, 1403 /* Note no edt- prefix for compatibility with the ft6236.c driver */ 1404 { .name = "ft6236", .driver_data = (long)&edt_ft6236_data }, 1405 { /* sentinel */ } 1406 }; 1407 MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id); 1408 1409 static const struct of_device_id edt_ft5x06_of_match[] = { 1410 { .compatible = "edt,edt-ft5206", .data = &edt_ft5x06_data }, 1411 { .compatible = "edt,edt-ft5306", .data = &edt_ft5x06_data }, 1412 { .compatible = "edt,edt-ft5406", .data = &edt_ft5x06_data }, 1413 { .compatible = "edt,edt-ft5506", .data = &edt_ft5506_data }, 1414 { .compatible = "evervision,ev-ft5726", .data = &edt_ft5506_data }, 1415 /* Note focaltech vendor prefix for compatibility with ft6236.c */ 1416 { .compatible = "focaltech,ft6236", .data = &edt_ft6236_data }, 1417 { /* sentinel */ } 1418 }; 1419 MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match); 1420 1421 static struct i2c_driver edt_ft5x06_ts_driver = { 1422 .driver = { 1423 .name = "edt_ft5x06", 1424 .of_match_table = edt_ft5x06_of_match, 1425 .pm = &edt_ft5x06_ts_pm_ops, 1426 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1427 }, 1428 .id_table = edt_ft5x06_ts_id, 1429 .probe = edt_ft5x06_ts_probe, 1430 .remove = edt_ft5x06_ts_remove, 1431 }; 1432 1433 module_i2c_driver(edt_ft5x06_ts_driver); 1434 1435 MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>"); 1436 MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver"); 1437 MODULE_LICENSE("GPL v2"); 1438