1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * ROHM BU21023/24 Dual touch support resistive touch screen driver 4 * Copyright (C) 2012 ROHM CO.,LTD. 5 */ 6 #include <linux/delay.h> 7 #include <linux/firmware.h> 8 #include <linux/i2c.h> 9 #include <linux/input.h> 10 #include <linux/input/mt.h> 11 #include <linux/interrupt.h> 12 #include <linux/module.h> 13 #include <linux/slab.h> 14 15 #define BU21023_NAME "bu21023_ts" 16 #define BU21023_FIRMWARE_NAME "bu21023.bin" 17 18 #define MAX_CONTACTS 2 19 20 #define AXIS_ADJUST 4 21 #define AXIS_OFFSET 8 22 23 #define FIRMWARE_BLOCK_SIZE 32U 24 #define FIRMWARE_RETRY_MAX 4 25 26 #define SAMPLING_DELAY 12 /* msec */ 27 28 #define CALIBRATION_RETRY_MAX 6 29 30 #define ROHM_TS_ABS_X_MIN 40 31 #define ROHM_TS_ABS_X_MAX 990 32 #define ROHM_TS_ABS_Y_MIN 160 33 #define ROHM_TS_ABS_Y_MAX 920 34 #define ROHM_TS_DISPLACEMENT_MAX 0 /* zero for infinite */ 35 36 /* 37 * BU21023GUL/BU21023MUV/BU21024FV-M registers map 38 */ 39 #define VADOUT_YP_H 0x00 40 #define VADOUT_YP_L 0x01 41 #define VADOUT_XP_H 0x02 42 #define VADOUT_XP_L 0x03 43 #define VADOUT_YN_H 0x04 44 #define VADOUT_YN_L 0x05 45 #define VADOUT_XN_H 0x06 46 #define VADOUT_XN_L 0x07 47 48 #define PRM1_X_H 0x08 49 #define PRM1_X_L 0x09 50 #define PRM1_Y_H 0x0a 51 #define PRM1_Y_L 0x0b 52 #define PRM2_X_H 0x0c 53 #define PRM2_X_L 0x0d 54 #define PRM2_Y_H 0x0e 55 #define PRM2_Y_L 0x0f 56 57 #define MLT_PRM_MONI_X 0x10 58 #define MLT_PRM_MONI_Y 0x11 59 60 #define DEBUG_MONI_1 0x12 61 #define DEBUG_MONI_2 0x13 62 63 #define VADOUT_ZX_H 0x14 64 #define VADOUT_ZX_L 0x15 65 #define VADOUT_ZY_H 0x16 66 #define VADOUT_ZY_L 0x17 67 68 #define Z_PARAM_H 0x18 69 #define Z_PARAM_L 0x19 70 71 /* 72 * Value for VADOUT_*_L 73 */ 74 #define VADOUT_L_MASK 0x01 75 76 /* 77 * Value for PRM*_*_L 78 */ 79 #define PRM_L_MASK 0x01 80 81 #define POS_X1_H 0x20 82 #define POS_X1_L 0x21 83 #define POS_Y1_H 0x22 84 #define POS_Y1_L 0x23 85 #define POS_X2_H 0x24 86 #define POS_X2_L 0x25 87 #define POS_Y2_H 0x26 88 #define POS_Y2_L 0x27 89 90 /* 91 * Value for POS_*_L 92 */ 93 #define POS_L_MASK 0x01 94 95 #define TOUCH 0x28 96 #define TOUCH_DETECT 0x01 97 98 #define TOUCH_GESTURE 0x29 99 #define SINGLE_TOUCH 0x01 100 #define DUAL_TOUCH 0x03 101 #define TOUCH_MASK 0x03 102 #define CALIBRATION_REQUEST 0x04 103 #define CALIBRATION_STATUS 0x08 104 #define CALIBRATION_MASK 0x0c 105 #define GESTURE_SPREAD 0x10 106 #define GESTURE_PINCH 0x20 107 #define GESTURE_ROTATE_R 0x40 108 #define GESTURE_ROTATE_L 0x80 109 110 #define INT_STATUS 0x2a 111 #define INT_MASK 0x3d 112 #define INT_CLEAR 0x3e 113 114 /* 115 * Values for INT_* 116 */ 117 #define COORD_UPDATE 0x01 118 #define CALIBRATION_DONE 0x02 119 #define SLEEP_IN 0x04 120 #define SLEEP_OUT 0x08 121 #define PROGRAM_LOAD_DONE 0x10 122 #define ERROR 0x80 123 #define INT_ALL 0x9f 124 125 #define ERR_STATUS 0x2b 126 #define ERR_MASK 0x3f 127 128 /* 129 * Values for ERR_* 130 */ 131 #define ADC_TIMEOUT 0x01 132 #define CPU_TIMEOUT 0x02 133 #define CALIBRATION_ERR 0x04 134 #define PROGRAM_LOAD_ERR 0x10 135 136 #define COMMON_SETUP1 0x30 137 #define PROGRAM_LOAD_HOST 0x02 138 #define PROGRAM_LOAD_EEPROM 0x03 139 #define CENSOR_4PORT 0x04 140 #define CENSOR_8PORT 0x00 /* Not supported by BU21023 */ 141 #define CALIBRATION_TYPE_DEFAULT 0x08 142 #define CALIBRATION_TYPE_SPECIAL 0x00 143 #define INT_ACTIVE_HIGH 0x10 144 #define INT_ACTIVE_LOW 0x00 145 #define AUTO_CALIBRATION 0x40 146 #define MANUAL_CALIBRATION 0x00 147 #define COMMON_SETUP1_DEFAULT 0x4e 148 149 #define COMMON_SETUP2 0x31 150 #define MAF_NONE 0x00 151 #define MAF_1SAMPLE 0x01 152 #define MAF_3SAMPLES 0x02 153 #define MAF_5SAMPLES 0x03 154 #define INV_Y 0x04 155 #define INV_X 0x08 156 #define SWAP_XY 0x10 157 158 #define COMMON_SETUP3 0x32 159 #define EN_SLEEP 0x01 160 #define EN_MULTI 0x02 161 #define EN_GESTURE 0x04 162 #define EN_INTVL 0x08 163 #define SEL_STEP 0x10 164 #define SEL_MULTI 0x20 165 #define SEL_TBL_DEFAULT 0x40 166 167 #define INTERVAL_TIME 0x33 168 #define INTERVAL_TIME_DEFAULT 0x10 169 170 #define STEP_X 0x34 171 #define STEP_X_DEFAULT 0x41 172 173 #define STEP_Y 0x35 174 #define STEP_Y_DEFAULT 0x8d 175 176 #define OFFSET_X 0x38 177 #define OFFSET_X_DEFAULT 0x0c 178 179 #define OFFSET_Y 0x39 180 #define OFFSET_Y_DEFAULT 0x0c 181 182 #define THRESHOLD_TOUCH 0x3a 183 #define THRESHOLD_TOUCH_DEFAULT 0xa0 184 185 #define THRESHOLD_GESTURE 0x3b 186 #define THRESHOLD_GESTURE_DEFAULT 0x17 187 188 #define SYSTEM 0x40 189 #define ANALOG_POWER_ON 0x01 190 #define ANALOG_POWER_OFF 0x00 191 #define CPU_POWER_ON 0x02 192 #define CPU_POWER_OFF 0x00 193 194 #define FORCE_CALIBRATION 0x42 195 #define FORCE_CALIBRATION_ON 0x01 196 #define FORCE_CALIBRATION_OFF 0x00 197 198 #define CPU_FREQ 0x50 /* 10 / (reg + 1) MHz */ 199 #define CPU_FREQ_10MHZ 0x00 200 #define CPU_FREQ_5MHZ 0x01 201 #define CPU_FREQ_1MHZ 0x09 202 203 #define EEPROM_ADDR 0x51 204 205 #define CALIBRATION_ADJUST 0x52 206 #define CALIBRATION_ADJUST_DEFAULT 0x00 207 208 #define THRESHOLD_SLEEP_IN 0x53 209 210 #define EVR_XY 0x56 211 #define EVR_XY_DEFAULT 0x10 212 213 #define PRM_SWOFF_TIME 0x57 214 #define PRM_SWOFF_TIME_DEFAULT 0x04 215 216 #define PROGRAM_VERSION 0x5f 217 218 #define ADC_CTRL 0x60 219 #define ADC_DIV_MASK 0x1f /* The minimum value is 4 */ 220 #define ADC_DIV_DEFAULT 0x08 221 222 #define ADC_WAIT 0x61 223 #define ADC_WAIT_DEFAULT 0x0a 224 225 #define SWCONT 0x62 226 #define SWCONT_DEFAULT 0x0f 227 228 #define EVR_X 0x63 229 #define EVR_X_DEFAULT 0x86 230 231 #define EVR_Y 0x64 232 #define EVR_Y_DEFAULT 0x64 233 234 #define TEST1 0x65 235 #define DUALTOUCH_STABILIZE_ON 0x01 236 #define DUALTOUCH_STABILIZE_OFF 0x00 237 #define DUALTOUCH_REG_ON 0x20 238 #define DUALTOUCH_REG_OFF 0x00 239 240 #define CALIBRATION_REG1 0x68 241 #define CALIBRATION_REG1_DEFAULT 0xd9 242 243 #define CALIBRATION_REG2 0x69 244 #define CALIBRATION_REG2_DEFAULT 0x36 245 246 #define CALIBRATION_REG3 0x6a 247 #define CALIBRATION_REG3_DEFAULT 0x32 248 249 #define EX_ADDR_H 0x70 250 #define EX_ADDR_L 0x71 251 #define EX_WDAT 0x72 252 #define EX_RDAT 0x73 253 #define EX_CHK_SUM1 0x74 254 #define EX_CHK_SUM2 0x75 255 #define EX_CHK_SUM3 0x76 256 257 struct rohm_ts_data { 258 struct i2c_client *client; 259 struct input_dev *input; 260 261 bool initialized; 262 263 unsigned int contact_count[MAX_CONTACTS + 1]; 264 int finger_count; 265 266 u8 setup2; 267 }; 268 269 /* 270 * rohm_i2c_burst_read - execute combined I2C message for ROHM BU21023/24 271 * @client: Handle to ROHM BU21023/24 272 * @start: Where to start read address from ROHM BU21023/24 273 * @buf: Where to store read data from ROHM BU21023/24 274 * @len: How many bytes to read 275 * 276 * Returns negative errno, else zero on success. 277 * 278 * Note 279 * In BU21023/24 burst read, stop condition is needed after "address write". 280 * Therefore, transmission is performed in 2 steps. 281 */ 282 static int rohm_i2c_burst_read(struct i2c_client *client, u8 start, void *buf, 283 size_t len) 284 { 285 struct i2c_adapter *adap = client->adapter; 286 struct i2c_msg msg[2]; 287 int i, ret = 0; 288 289 msg[0].addr = client->addr; 290 msg[0].flags = 0; 291 msg[0].len = 1; 292 msg[0].buf = &start; 293 294 msg[1].addr = client->addr; 295 msg[1].flags = I2C_M_RD; 296 msg[1].len = len; 297 msg[1].buf = buf; 298 299 i2c_lock_bus(adap, I2C_LOCK_SEGMENT); 300 301 for (i = 0; i < 2; i++) { 302 if (__i2c_transfer(adap, &msg[i], 1) < 0) { 303 ret = -EIO; 304 break; 305 } 306 } 307 308 i2c_unlock_bus(adap, I2C_LOCK_SEGMENT); 309 310 return ret; 311 } 312 313 static int rohm_ts_manual_calibration(struct rohm_ts_data *ts) 314 { 315 struct i2c_client *client = ts->client; 316 struct device *dev = &client->dev; 317 u8 buf[33]; /* for PRM1_X_H(0x08)-TOUCH(0x28) */ 318 319 int retry; 320 bool success = false; 321 bool first_time = true; 322 bool calibration_done; 323 324 u8 reg1, reg2, reg3; 325 s32 reg1_orig, reg2_orig, reg3_orig; 326 s32 val; 327 328 int calib_x = 0, calib_y = 0; 329 int reg_x, reg_y; 330 int err_x, err_y; 331 332 int error, error2; 333 int i; 334 335 reg1_orig = i2c_smbus_read_byte_data(client, CALIBRATION_REG1); 336 if (reg1_orig < 0) 337 return reg1_orig; 338 339 reg2_orig = i2c_smbus_read_byte_data(client, CALIBRATION_REG2); 340 if (reg2_orig < 0) 341 return reg2_orig; 342 343 reg3_orig = i2c_smbus_read_byte_data(client, CALIBRATION_REG3); 344 if (reg3_orig < 0) 345 return reg3_orig; 346 347 error = i2c_smbus_write_byte_data(client, INT_MASK, 348 COORD_UPDATE | SLEEP_IN | SLEEP_OUT | 349 PROGRAM_LOAD_DONE); 350 if (error) 351 goto out; 352 353 error = i2c_smbus_write_byte_data(client, TEST1, 354 DUALTOUCH_STABILIZE_ON); 355 if (error) 356 goto out; 357 358 for (retry = 0; retry < CALIBRATION_RETRY_MAX; retry++) { 359 /* wait 2 sampling for update */ 360 mdelay(2 * SAMPLING_DELAY); 361 362 #define READ_CALIB_BUF(reg) buf[((reg) - PRM1_X_H)] 363 364 error = rohm_i2c_burst_read(client, PRM1_X_H, buf, sizeof(buf)); 365 if (error) 366 goto out; 367 368 if (READ_CALIB_BUF(TOUCH) & TOUCH_DETECT) 369 continue; 370 371 if (first_time) { 372 /* generate calibration parameter */ 373 calib_x = ((int)READ_CALIB_BUF(PRM1_X_H) << 2 | 374 READ_CALIB_BUF(PRM1_X_L)) - AXIS_OFFSET; 375 calib_y = ((int)READ_CALIB_BUF(PRM1_Y_H) << 2 | 376 READ_CALIB_BUF(PRM1_Y_L)) - AXIS_OFFSET; 377 378 error = i2c_smbus_write_byte_data(client, TEST1, 379 DUALTOUCH_STABILIZE_ON | DUALTOUCH_REG_ON); 380 if (error) 381 goto out; 382 383 first_time = false; 384 } else { 385 /* generate adjustment parameter */ 386 err_x = (int)READ_CALIB_BUF(PRM1_X_H) << 2 | 387 READ_CALIB_BUF(PRM1_X_L); 388 err_y = (int)READ_CALIB_BUF(PRM1_Y_H) << 2 | 389 READ_CALIB_BUF(PRM1_Y_L); 390 391 /* X axis ajust */ 392 if (err_x <= 4) 393 calib_x -= AXIS_ADJUST; 394 else if (err_x >= 60) 395 calib_x += AXIS_ADJUST; 396 397 /* Y axis ajust */ 398 if (err_y <= 4) 399 calib_y -= AXIS_ADJUST; 400 else if (err_y >= 60) 401 calib_y += AXIS_ADJUST; 402 } 403 404 /* generate calibration setting value */ 405 reg_x = calib_x + ((calib_x & 0x200) << 1); 406 reg_y = calib_y + ((calib_y & 0x200) << 1); 407 408 /* convert for register format */ 409 reg1 = reg_x >> 3; 410 reg2 = (reg_y & 0x7) << 4 | (reg_x & 0x7); 411 reg3 = reg_y >> 3; 412 413 error = i2c_smbus_write_byte_data(client, 414 CALIBRATION_REG1, reg1); 415 if (error) 416 goto out; 417 418 error = i2c_smbus_write_byte_data(client, 419 CALIBRATION_REG2, reg2); 420 if (error) 421 goto out; 422 423 error = i2c_smbus_write_byte_data(client, 424 CALIBRATION_REG3, reg3); 425 if (error) 426 goto out; 427 428 /* 429 * force calibration sequcence 430 */ 431 error = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION, 432 FORCE_CALIBRATION_OFF); 433 if (error) 434 goto out; 435 436 error = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION, 437 FORCE_CALIBRATION_ON); 438 if (error) 439 goto out; 440 441 /* clear all interrupts */ 442 error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff); 443 if (error) 444 goto out; 445 446 /* 447 * Wait for the status change of calibration, max 10 sampling 448 */ 449 calibration_done = false; 450 451 for (i = 0; i < 10; i++) { 452 mdelay(SAMPLING_DELAY); 453 454 val = i2c_smbus_read_byte_data(client, TOUCH_GESTURE); 455 if (!(val & CALIBRATION_MASK)) { 456 calibration_done = true; 457 break; 458 } else if (val < 0) { 459 error = val; 460 goto out; 461 } 462 } 463 464 if (calibration_done) { 465 val = i2c_smbus_read_byte_data(client, INT_STATUS); 466 if (val == CALIBRATION_DONE) { 467 success = true; 468 break; 469 } else if (val < 0) { 470 error = val; 471 goto out; 472 } 473 } else { 474 dev_warn(dev, "calibration timeout\n"); 475 } 476 } 477 478 if (!success) { 479 error = i2c_smbus_write_byte_data(client, CALIBRATION_REG1, 480 reg1_orig); 481 if (error) 482 goto out; 483 484 error = i2c_smbus_write_byte_data(client, CALIBRATION_REG2, 485 reg2_orig); 486 if (error) 487 goto out; 488 489 error = i2c_smbus_write_byte_data(client, CALIBRATION_REG3, 490 reg3_orig); 491 if (error) 492 goto out; 493 494 /* calibration data enable */ 495 error = i2c_smbus_write_byte_data(client, TEST1, 496 DUALTOUCH_STABILIZE_ON | 497 DUALTOUCH_REG_ON); 498 if (error) 499 goto out; 500 501 /* wait 10 sampling */ 502 mdelay(10 * SAMPLING_DELAY); 503 504 error = -EBUSY; 505 } 506 507 out: 508 error2 = i2c_smbus_write_byte_data(client, INT_MASK, INT_ALL); 509 if (!error2) 510 /* Clear all interrupts */ 511 error2 = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff); 512 513 return error ? error : error2; 514 } 515 516 static const unsigned int untouch_threshold[3] = { 0, 1, 5 }; 517 static const unsigned int single_touch_threshold[3] = { 0, 0, 4 }; 518 static const unsigned int dual_touch_threshold[3] = { 10, 8, 0 }; 519 520 static irqreturn_t rohm_ts_soft_irq(int irq, void *dev_id) 521 { 522 struct rohm_ts_data *ts = dev_id; 523 struct i2c_client *client = ts->client; 524 struct input_dev *input_dev = ts->input; 525 struct device *dev = &client->dev; 526 527 u8 buf[10]; /* for POS_X1_H(0x20)-TOUCH_GESTURE(0x29) */ 528 529 struct input_mt_pos pos[MAX_CONTACTS]; 530 int slots[MAX_CONTACTS]; 531 u8 touch_flags; 532 unsigned int threshold; 533 int finger_count = -1; 534 int prev_finger_count = ts->finger_count; 535 int count; 536 int error; 537 int i; 538 539 error = i2c_smbus_write_byte_data(client, INT_MASK, INT_ALL); 540 if (error) 541 return IRQ_HANDLED; 542 543 /* Clear all interrupts */ 544 error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff); 545 if (error) 546 return IRQ_HANDLED; 547 548 #define READ_POS_BUF(reg) buf[((reg) - POS_X1_H)] 549 550 error = rohm_i2c_burst_read(client, POS_X1_H, buf, sizeof(buf)); 551 if (error) 552 return IRQ_HANDLED; 553 554 touch_flags = READ_POS_BUF(TOUCH_GESTURE) & TOUCH_MASK; 555 if (touch_flags) { 556 /* generate coordinates */ 557 pos[0].x = ((s16)READ_POS_BUF(POS_X1_H) << 2) | 558 READ_POS_BUF(POS_X1_L); 559 pos[0].y = ((s16)READ_POS_BUF(POS_Y1_H) << 2) | 560 READ_POS_BUF(POS_Y1_L); 561 pos[1].x = ((s16)READ_POS_BUF(POS_X2_H) << 2) | 562 READ_POS_BUF(POS_X2_L); 563 pos[1].y = ((s16)READ_POS_BUF(POS_Y2_H) << 2) | 564 READ_POS_BUF(POS_Y2_L); 565 } 566 567 switch (touch_flags) { 568 case 0: 569 threshold = untouch_threshold[prev_finger_count]; 570 if (++ts->contact_count[0] >= threshold) 571 finger_count = 0; 572 break; 573 574 case SINGLE_TOUCH: 575 threshold = single_touch_threshold[prev_finger_count]; 576 if (++ts->contact_count[1] >= threshold) 577 finger_count = 1; 578 579 if (finger_count == 1) { 580 if (pos[1].x != 0 && pos[1].y != 0) { 581 pos[0].x = pos[1].x; 582 pos[0].y = pos[1].y; 583 pos[1].x = 0; 584 pos[1].y = 0; 585 } 586 } 587 break; 588 589 case DUAL_TOUCH: 590 threshold = dual_touch_threshold[prev_finger_count]; 591 if (++ts->contact_count[2] >= threshold) 592 finger_count = 2; 593 break; 594 595 default: 596 dev_dbg(dev, 597 "Three or more touches are not supported\n"); 598 return IRQ_HANDLED; 599 } 600 601 if (finger_count >= 0) { 602 if (prev_finger_count != finger_count) { 603 count = ts->contact_count[finger_count]; 604 memset(ts->contact_count, 0, sizeof(ts->contact_count)); 605 ts->contact_count[finger_count] = count; 606 } 607 608 input_mt_assign_slots(input_dev, slots, pos, 609 finger_count, ROHM_TS_DISPLACEMENT_MAX); 610 611 for (i = 0; i < finger_count; i++) { 612 input_mt_slot(input_dev, slots[i]); 613 input_mt_report_slot_state(input_dev, 614 MT_TOOL_FINGER, true); 615 input_report_abs(input_dev, 616 ABS_MT_POSITION_X, pos[i].x); 617 input_report_abs(input_dev, 618 ABS_MT_POSITION_Y, pos[i].y); 619 } 620 621 input_mt_sync_frame(input_dev); 622 input_mt_report_pointer_emulation(input_dev, true); 623 input_sync(input_dev); 624 625 ts->finger_count = finger_count; 626 } 627 628 if (READ_POS_BUF(TOUCH_GESTURE) & CALIBRATION_REQUEST) { 629 error = rohm_ts_manual_calibration(ts); 630 if (error) 631 dev_warn(dev, "manual calibration failed: %d\n", 632 error); 633 } 634 635 i2c_smbus_write_byte_data(client, INT_MASK, 636 CALIBRATION_DONE | SLEEP_OUT | SLEEP_IN | 637 PROGRAM_LOAD_DONE); 638 639 return IRQ_HANDLED; 640 } 641 642 static int rohm_ts_load_firmware(struct i2c_client *client, 643 const char *firmware_name) 644 { 645 struct device *dev = &client->dev; 646 s32 status; 647 unsigned int offset, len, xfer_len; 648 unsigned int retry = 0; 649 int error, error2; 650 651 const struct firmware *fw __free(firmware) = NULL; 652 error = request_firmware(&fw, firmware_name, dev); 653 if (error) { 654 dev_err(dev, "unable to retrieve firmware %s: %d\n", 655 firmware_name, error); 656 return error; 657 } 658 659 error = i2c_smbus_write_byte_data(client, INT_MASK, 660 COORD_UPDATE | CALIBRATION_DONE | 661 SLEEP_IN | SLEEP_OUT); 662 if (error) 663 goto out; 664 665 do { 666 if (retry) { 667 dev_warn(dev, "retrying firmware load\n"); 668 669 /* settings for retry */ 670 error = i2c_smbus_write_byte_data(client, EX_WDAT, 0); 671 if (error) 672 goto out; 673 } 674 675 error = i2c_smbus_write_byte_data(client, EX_ADDR_H, 0); 676 if (error) 677 goto out; 678 679 error = i2c_smbus_write_byte_data(client, EX_ADDR_L, 0); 680 if (error) 681 goto out; 682 683 error = i2c_smbus_write_byte_data(client, COMMON_SETUP1, 684 COMMON_SETUP1_DEFAULT); 685 if (error) 686 goto out; 687 688 /* firmware load to the device */ 689 offset = 0; 690 len = fw->size; 691 692 while (len) { 693 xfer_len = min(FIRMWARE_BLOCK_SIZE, len); 694 695 error = i2c_smbus_write_i2c_block_data(client, EX_WDAT, 696 xfer_len, &fw->data[offset]); 697 if (error) 698 goto out; 699 700 len -= xfer_len; 701 offset += xfer_len; 702 } 703 704 /* check firmware load result */ 705 status = i2c_smbus_read_byte_data(client, INT_STATUS); 706 if (status < 0) { 707 error = status; 708 goto out; 709 } 710 711 /* clear all interrupts */ 712 error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff); 713 if (error) 714 goto out; 715 716 if (status == PROGRAM_LOAD_DONE) 717 break; 718 719 error = -EIO; 720 } while (++retry <= FIRMWARE_RETRY_MAX); 721 722 out: 723 error2 = i2c_smbus_write_byte_data(client, INT_MASK, INT_ALL); 724 725 return error ? error : error2; 726 } 727 728 static int rohm_ts_update_setting(struct rohm_ts_data *ts, 729 unsigned int setting_bit, bool on) 730 { 731 int error; 732 733 scoped_cond_guard(mutex_intr, return -EINTR, &ts->input->mutex) { 734 if (on) 735 ts->setup2 |= setting_bit; 736 else 737 ts->setup2 &= ~setting_bit; 738 739 if (ts->initialized) { 740 error = i2c_smbus_write_byte_data(ts->client, 741 COMMON_SETUP2, 742 ts->setup2); 743 if (error) 744 return error; 745 } 746 } 747 748 return 0; 749 } 750 751 static ssize_t swap_xy_show(struct device *dev, struct device_attribute *attr, 752 char *buf) 753 { 754 struct i2c_client *client = to_i2c_client(dev); 755 struct rohm_ts_data *ts = i2c_get_clientdata(client); 756 757 return sysfs_emit(buf, "%d\n", !!(ts->setup2 & SWAP_XY)); 758 } 759 760 static ssize_t swap_xy_store(struct device *dev, struct device_attribute *attr, 761 const char *buf, size_t count) 762 { 763 struct i2c_client *client = to_i2c_client(dev); 764 struct rohm_ts_data *ts = i2c_get_clientdata(client); 765 unsigned int val; 766 int error; 767 768 error = kstrtouint(buf, 0, &val); 769 if (error) 770 return error; 771 772 error = rohm_ts_update_setting(ts, SWAP_XY, val); 773 return error ?: count; 774 } 775 776 static ssize_t inv_x_show(struct device *dev, struct device_attribute *attr, 777 char *buf) 778 { 779 struct i2c_client *client = to_i2c_client(dev); 780 struct rohm_ts_data *ts = i2c_get_clientdata(client); 781 782 return sysfs_emit(buf, "%d\n", !!(ts->setup2 & INV_X)); 783 } 784 785 static ssize_t inv_x_store(struct device *dev, struct device_attribute *attr, 786 const char *buf, size_t count) 787 { 788 struct i2c_client *client = to_i2c_client(dev); 789 struct rohm_ts_data *ts = i2c_get_clientdata(client); 790 unsigned int val; 791 int error; 792 793 error = kstrtouint(buf, 0, &val); 794 if (error) 795 return error; 796 797 error = rohm_ts_update_setting(ts, INV_X, val); 798 return error ?: count; 799 } 800 801 static ssize_t inv_y_show(struct device *dev, struct device_attribute *attr, 802 char *buf) 803 { 804 struct i2c_client *client = to_i2c_client(dev); 805 struct rohm_ts_data *ts = i2c_get_clientdata(client); 806 807 return sysfs_emit(buf, "%d\n", !!(ts->setup2 & INV_Y)); 808 } 809 810 static ssize_t inv_y_store(struct device *dev, struct device_attribute *attr, 811 const char *buf, size_t count) 812 { 813 struct i2c_client *client = to_i2c_client(dev); 814 struct rohm_ts_data *ts = i2c_get_clientdata(client); 815 unsigned int val; 816 int error; 817 818 error = kstrtouint(buf, 0, &val); 819 if (error) 820 return error; 821 822 error = rohm_ts_update_setting(ts, INV_Y, val); 823 return error ?: count; 824 } 825 826 static DEVICE_ATTR_RW(swap_xy); 827 static DEVICE_ATTR_RW(inv_x); 828 static DEVICE_ATTR_RW(inv_y); 829 830 static struct attribute *rohm_ts_attrs[] = { 831 &dev_attr_swap_xy.attr, 832 &dev_attr_inv_x.attr, 833 &dev_attr_inv_y.attr, 834 NULL, 835 }; 836 ATTRIBUTE_GROUPS(rohm_ts); 837 838 static int rohm_ts_device_init(struct i2c_client *client, u8 setup2) 839 { 840 struct device *dev = &client->dev; 841 int error; 842 843 guard(disable_irq)(&client->irq); 844 845 /* 846 * Wait 200usec for reset 847 */ 848 udelay(200); 849 850 /* Release analog reset */ 851 error = i2c_smbus_write_byte_data(client, SYSTEM, 852 ANALOG_POWER_ON | CPU_POWER_OFF); 853 if (error) 854 return error; 855 856 /* Waiting for the analog warm-up, max. 200usec */ 857 udelay(200); 858 859 /* clear all interrupts */ 860 error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff); 861 if (error) 862 return error; 863 864 error = i2c_smbus_write_byte_data(client, EX_WDAT, 0); 865 if (error) 866 return error; 867 868 error = i2c_smbus_write_byte_data(client, COMMON_SETUP1, 0); 869 if (error) 870 return error; 871 872 error = i2c_smbus_write_byte_data(client, COMMON_SETUP2, setup2); 873 if (error) 874 return error; 875 876 error = i2c_smbus_write_byte_data(client, COMMON_SETUP3, 877 SEL_TBL_DEFAULT | EN_MULTI); 878 if (error) 879 return error; 880 881 error = i2c_smbus_write_byte_data(client, THRESHOLD_GESTURE, 882 THRESHOLD_GESTURE_DEFAULT); 883 if (error) 884 return error; 885 886 error = i2c_smbus_write_byte_data(client, INTERVAL_TIME, 887 INTERVAL_TIME_DEFAULT); 888 if (error) 889 return error; 890 891 error = i2c_smbus_write_byte_data(client, CPU_FREQ, CPU_FREQ_10MHZ); 892 if (error) 893 return error; 894 895 error = i2c_smbus_write_byte_data(client, PRM_SWOFF_TIME, 896 PRM_SWOFF_TIME_DEFAULT); 897 if (error) 898 return error; 899 900 error = i2c_smbus_write_byte_data(client, ADC_CTRL, ADC_DIV_DEFAULT); 901 if (error) 902 return error; 903 904 error = i2c_smbus_write_byte_data(client, ADC_WAIT, ADC_WAIT_DEFAULT); 905 if (error) 906 return error; 907 908 /* 909 * Panel setup, these values change with the panel. 910 */ 911 error = i2c_smbus_write_byte_data(client, STEP_X, STEP_X_DEFAULT); 912 if (error) 913 return error; 914 915 error = i2c_smbus_write_byte_data(client, STEP_Y, STEP_Y_DEFAULT); 916 if (error) 917 return error; 918 919 error = i2c_smbus_write_byte_data(client, OFFSET_X, OFFSET_X_DEFAULT); 920 if (error) 921 return error; 922 923 error = i2c_smbus_write_byte_data(client, OFFSET_Y, OFFSET_Y_DEFAULT); 924 if (error) 925 return error; 926 927 error = i2c_smbus_write_byte_data(client, THRESHOLD_TOUCH, 928 THRESHOLD_TOUCH_DEFAULT); 929 if (error) 930 return error; 931 932 error = i2c_smbus_write_byte_data(client, EVR_XY, EVR_XY_DEFAULT); 933 if (error) 934 return error; 935 936 error = i2c_smbus_write_byte_data(client, EVR_X, EVR_X_DEFAULT); 937 if (error) 938 return error; 939 940 error = i2c_smbus_write_byte_data(client, EVR_Y, EVR_Y_DEFAULT); 941 if (error) 942 return error; 943 944 /* Fixed value settings */ 945 error = i2c_smbus_write_byte_data(client, CALIBRATION_ADJUST, 946 CALIBRATION_ADJUST_DEFAULT); 947 if (error) 948 return error; 949 950 error = i2c_smbus_write_byte_data(client, SWCONT, SWCONT_DEFAULT); 951 if (error) 952 return error; 953 954 error = i2c_smbus_write_byte_data(client, TEST1, 955 DUALTOUCH_STABILIZE_ON | 956 DUALTOUCH_REG_ON); 957 if (error) 958 return error; 959 960 error = rohm_ts_load_firmware(client, BU21023_FIRMWARE_NAME); 961 if (error) { 962 dev_err(dev, "failed to load firmware: %d\n", error); 963 return error; 964 } 965 966 /* 967 * Manual calibration results are not changed in same environment. 968 * If the force calibration is performed, 969 * the controller will not require calibration request interrupt 970 * when the typical values are set to the calibration registers. 971 */ 972 error = i2c_smbus_write_byte_data(client, CALIBRATION_REG1, 973 CALIBRATION_REG1_DEFAULT); 974 if (error) 975 return error; 976 977 error = i2c_smbus_write_byte_data(client, CALIBRATION_REG2, 978 CALIBRATION_REG2_DEFAULT); 979 if (error) 980 return error; 981 982 error = i2c_smbus_write_byte_data(client, CALIBRATION_REG3, 983 CALIBRATION_REG3_DEFAULT); 984 if (error) 985 return error; 986 987 error = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION, 988 FORCE_CALIBRATION_OFF); 989 if (error) 990 return error; 991 992 error = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION, 993 FORCE_CALIBRATION_ON); 994 if (error) 995 return error; 996 997 /* Clear all interrupts */ 998 error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff); 999 if (error) 1000 return error; 1001 1002 /* Enable coordinates update interrupt */ 1003 error = i2c_smbus_write_byte_data(client, INT_MASK, 1004 CALIBRATION_DONE | SLEEP_OUT | 1005 SLEEP_IN | PROGRAM_LOAD_DONE); 1006 if (error) 1007 return error; 1008 1009 error = i2c_smbus_write_byte_data(client, ERR_MASK, 1010 PROGRAM_LOAD_ERR | CPU_TIMEOUT | 1011 ADC_TIMEOUT); 1012 if (error) 1013 return error; 1014 1015 /* controller CPU power on */ 1016 error = i2c_smbus_write_byte_data(client, SYSTEM, 1017 ANALOG_POWER_ON | CPU_POWER_ON); 1018 if (error) 1019 return error; 1020 1021 return 0; 1022 } 1023 1024 static int rohm_ts_power_off(struct i2c_client *client) 1025 { 1026 int error; 1027 1028 error = i2c_smbus_write_byte_data(client, SYSTEM, 1029 ANALOG_POWER_ON | CPU_POWER_OFF); 1030 if (error) { 1031 dev_err(&client->dev, 1032 "failed to power off device CPU: %d\n", error); 1033 return error; 1034 } 1035 1036 error = i2c_smbus_write_byte_data(client, SYSTEM, 1037 ANALOG_POWER_OFF | CPU_POWER_OFF); 1038 if (error) 1039 dev_err(&client->dev, 1040 "failed to power off the device: %d\n", error); 1041 1042 return error; 1043 } 1044 1045 static int rohm_ts_open(struct input_dev *input_dev) 1046 { 1047 struct rohm_ts_data *ts = input_get_drvdata(input_dev); 1048 struct i2c_client *client = ts->client; 1049 int error; 1050 1051 if (!ts->initialized) { 1052 error = rohm_ts_device_init(client, ts->setup2); 1053 if (error) { 1054 dev_err(&client->dev, 1055 "device initialization failed: %d\n", error); 1056 return error; 1057 } 1058 1059 ts->initialized = true; 1060 } 1061 1062 return 0; 1063 } 1064 1065 static void rohm_ts_close(struct input_dev *input_dev) 1066 { 1067 struct rohm_ts_data *ts = input_get_drvdata(input_dev); 1068 1069 rohm_ts_power_off(ts->client); 1070 1071 ts->initialized = false; 1072 } 1073 1074 static int rohm_bu21023_i2c_probe(struct i2c_client *client) 1075 { 1076 struct device *dev = &client->dev; 1077 struct rohm_ts_data *ts; 1078 struct input_dev *input; 1079 int error; 1080 1081 if (!client->irq) { 1082 dev_err(dev, "IRQ is not assigned\n"); 1083 return -EINVAL; 1084 } 1085 1086 if (!client->adapter->algo->master_xfer) { 1087 dev_err(dev, "I2C level transfers not supported\n"); 1088 return -EOPNOTSUPP; 1089 } 1090 1091 /* Turn off CPU just in case */ 1092 error = rohm_ts_power_off(client); 1093 if (error) 1094 return error; 1095 1096 ts = devm_kzalloc(dev, sizeof(struct rohm_ts_data), GFP_KERNEL); 1097 if (!ts) 1098 return -ENOMEM; 1099 1100 ts->client = client; 1101 ts->setup2 = MAF_1SAMPLE; 1102 i2c_set_clientdata(client, ts); 1103 1104 input = devm_input_allocate_device(dev); 1105 if (!input) 1106 return -ENOMEM; 1107 1108 input->name = BU21023_NAME; 1109 input->id.bustype = BUS_I2C; 1110 input->open = rohm_ts_open; 1111 input->close = rohm_ts_close; 1112 1113 ts->input = input; 1114 input_set_drvdata(input, ts); 1115 1116 input_set_abs_params(input, ABS_MT_POSITION_X, 1117 ROHM_TS_ABS_X_MIN, ROHM_TS_ABS_X_MAX, 0, 0); 1118 input_set_abs_params(input, ABS_MT_POSITION_Y, 1119 ROHM_TS_ABS_Y_MIN, ROHM_TS_ABS_Y_MAX, 0, 0); 1120 1121 error = input_mt_init_slots(input, MAX_CONTACTS, 1122 INPUT_MT_DIRECT | INPUT_MT_TRACK | 1123 INPUT_MT_DROP_UNUSED); 1124 if (error) { 1125 dev_err(dev, "failed to multi touch slots initialization\n"); 1126 return error; 1127 } 1128 1129 error = devm_request_threaded_irq(dev, client->irq, 1130 NULL, rohm_ts_soft_irq, 1131 IRQF_ONESHOT, client->name, ts); 1132 if (error) { 1133 dev_err(dev, "failed to request IRQ: %d\n", error); 1134 return error; 1135 } 1136 1137 error = input_register_device(input); 1138 if (error) { 1139 dev_err(dev, "failed to register input device: %d\n", error); 1140 return error; 1141 } 1142 1143 return error; 1144 } 1145 1146 static const struct i2c_device_id rohm_bu21023_i2c_id[] = { 1147 { BU21023_NAME }, 1148 { /* sentinel */ } 1149 }; 1150 MODULE_DEVICE_TABLE(i2c, rohm_bu21023_i2c_id); 1151 1152 static struct i2c_driver rohm_bu21023_i2c_driver = { 1153 .driver = { 1154 .name = BU21023_NAME, 1155 .dev_groups = rohm_ts_groups, 1156 }, 1157 .probe = rohm_bu21023_i2c_probe, 1158 .id_table = rohm_bu21023_i2c_id, 1159 }; 1160 module_i2c_driver(rohm_bu21023_i2c_driver); 1161 1162 MODULE_DESCRIPTION("ROHM BU21023/24 Touchscreen driver"); 1163 MODULE_LICENSE("GPL v2"); 1164 MODULE_AUTHOR("ROHM Co., Ltd."); 1165