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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 | // SPDX-License-Identifier: GPL-2.0+ // Copyright IBM Corp 2019 /* * The DPS310 is a barometric pressure and temperature sensor. * Currently only reading a single temperature is supported by * this driver. * * https://www.infineon.com/dgdl/?fileId=5546d462576f34750157750826c42242 * * Temperature calculation: * c0 * 0.5 + c1 * T_raw / kT °C * * TODO: * - Optionally support the FIFO */ #include <linux/i2c.h> #include <linux/limits.h> #include <linux/math64.h> #include <linux/module.h> #include <linux/regmap.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #define DPS310_DEV_NAME "dps310" #define DPS310_PRS_B0 0x00 #define DPS310_PRS_B1 0x01 #define DPS310_PRS_B2 0x02 #define DPS310_TMP_B0 0x03 #define DPS310_TMP_B1 0x04 #define DPS310_TMP_B2 0x05 #define DPS310_PRS_CFG 0x06 #define DPS310_PRS_RATE_BITS GENMASK(6, 4) #define DPS310_PRS_PRC_BITS GENMASK(3, 0) #define DPS310_TMP_CFG 0x07 #define DPS310_TMP_RATE_BITS GENMASK(6, 4) #define DPS310_TMP_PRC_BITS GENMASK(3, 0) #define DPS310_TMP_EXT BIT(7) #define DPS310_MEAS_CFG 0x08 #define DPS310_MEAS_CTRL_BITS GENMASK(2, 0) #define DPS310_PRS_EN BIT(0) #define DPS310_TEMP_EN BIT(1) #define DPS310_BACKGROUND BIT(2) #define DPS310_PRS_RDY BIT(4) #define DPS310_TMP_RDY BIT(5) #define DPS310_SENSOR_RDY BIT(6) #define DPS310_COEF_RDY BIT(7) #define DPS310_CFG_REG 0x09 #define DPS310_INT_HL BIT(7) #define DPS310_TMP_SHIFT_EN BIT(3) #define DPS310_PRS_SHIFT_EN BIT(4) #define DPS310_FIFO_EN BIT(5) #define DPS310_SPI_EN BIT(6) #define DPS310_RESET 0x0c #define DPS310_RESET_MAGIC 0x09 #define DPS310_COEF_BASE 0x10 /* Make sure sleep time is <= 20ms for usleep_range */ #define DPS310_POLL_SLEEP_US(t) min(20000, (t) / 8) /* Silently handle error in rate value here */ #define DPS310_POLL_TIMEOUT_US(rc) ((rc) <= 0 ? 1000000 : 1000000 / (rc)) #define DPS310_PRS_BASE DPS310_PRS_B0 #define DPS310_TMP_BASE DPS310_TMP_B0 /* * These values (defined in the spec) indicate how to scale the raw register * values for each level of precision available. */ static const int scale_factors[] = { 524288, 1572864, 3670016, 7864320, 253952, 516096, 1040384, 2088960, }; struct dps310_data { struct i2c_client *client; struct regmap *regmap; struct mutex lock; /* Lock for sequential HW access functions */ s32 c0, c1; s32 c00, c10, c20, c30, c01, c11, c21; s32 pressure_raw; s32 temp_raw; bool timeout_recovery_failed; }; static const struct iio_chan_spec dps310_channels[] = { { .type = IIO_TEMP, .info_mask_separate = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) | BIT(IIO_CHAN_INFO_SAMP_FREQ) | BIT(IIO_CHAN_INFO_PROCESSED), }, { .type = IIO_PRESSURE, .info_mask_separate = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) | BIT(IIO_CHAN_INFO_SAMP_FREQ) | BIT(IIO_CHAN_INFO_PROCESSED), }, }; /* To be called after checking the COEF_RDY bit in MEAS_CFG */ static int dps310_get_coefs(struct dps310_data *data) { int rc; u8 coef[18]; u32 c0, c1; u32 c00, c10, c20, c30, c01, c11, c21; /* Read all sensor calibration coefficients from the COEF registers. */ rc = regmap_bulk_read(data->regmap, DPS310_COEF_BASE, coef, sizeof(coef)); if (rc < 0) return rc; /* * Calculate temperature calibration coefficients c0 and c1. The * numbers are 12-bit 2's complement numbers. */ c0 = (coef[0] << 4) | (coef[1] >> 4); data->c0 = sign_extend32(c0, 11); c1 = ((coef[1] & GENMASK(3, 0)) << 8) | coef[2]; data->c1 = sign_extend32(c1, 11); /* * Calculate pressure calibration coefficients. c00 and c10 are 20 bit * 2's complement numbers, while the rest are 16 bit 2's complement * numbers. */ c00 = (coef[3] << 12) | (coef[4] << 4) | (coef[5] >> 4); data->c00 = sign_extend32(c00, 19); c10 = ((coef[5] & GENMASK(3, 0)) << 16) | (coef[6] << 8) | coef[7]; data->c10 = sign_extend32(c10, 19); c01 = (coef[8] << 8) | coef[9]; data->c01 = sign_extend32(c01, 15); c11 = (coef[10] << 8) | coef[11]; data->c11 = sign_extend32(c11, 15); c20 = (coef[12] << 8) | coef[13]; data->c20 = sign_extend32(c20, 15); c21 = (coef[14] << 8) | coef[15]; data->c21 = sign_extend32(c21, 15); c30 = (coef[16] << 8) | coef[17]; data->c30 = sign_extend32(c30, 15); return 0; } /* * Some versions of the chip will read temperatures in the ~60C range when * it's actually ~20C. This is the manufacturer recommended workaround * to correct the issue. The registers used below are undocumented. */ static int dps310_temp_workaround(struct dps310_data *data) { int rc; int reg; rc = regmap_read(data->regmap, 0x32, ®); if (rc) return rc; /* * If bit 1 is set then the device is okay, and the workaround does not * need to be applied */ if (reg & BIT(1)) return 0; rc = regmap_write(data->regmap, 0x0e, 0xA5); if (rc) return rc; rc = regmap_write(data->regmap, 0x0f, 0x96); if (rc) return rc; rc = regmap_write(data->regmap, 0x62, 0x02); if (rc) return rc; rc = regmap_write(data->regmap, 0x0e, 0x00); if (rc) return rc; return regmap_write(data->regmap, 0x0f, 0x00); } static int dps310_startup(struct dps310_data *data) { int rc; int ready; /* * Set up pressure sensor in single sample, one measurement per second * mode */ rc = regmap_write(data->regmap, DPS310_PRS_CFG, 0); if (rc) return rc; /* * Set up external (MEMS) temperature sensor in single sample, one * measurement per second mode */ rc = regmap_write(data->regmap, DPS310_TMP_CFG, DPS310_TMP_EXT); if (rc) return rc; /* Temp and pressure shifts are disabled when PRC <= 8 */ rc = regmap_write_bits(data->regmap, DPS310_CFG_REG, DPS310_PRS_SHIFT_EN | DPS310_TMP_SHIFT_EN, 0); if (rc) return rc; /* MEAS_CFG doesn't update correctly unless first written with 0 */ rc = regmap_write_bits(data->regmap, DPS310_MEAS_CFG, DPS310_MEAS_CTRL_BITS, 0); if (rc) return rc; /* Turn on temperature and pressure measurement in the background */ rc = regmap_write_bits(data->regmap, DPS310_MEAS_CFG, DPS310_MEAS_CTRL_BITS, DPS310_PRS_EN | DPS310_TEMP_EN | DPS310_BACKGROUND); if (rc) return rc; /* * Calibration coefficients required for reporting temperature. * They are available 40ms after the device has started */ rc = regmap_read_poll_timeout(data->regmap, DPS310_MEAS_CFG, ready, ready & DPS310_COEF_RDY, 10000, 40000); if (rc) return rc; rc = dps310_get_coefs(data); if (rc) return rc; return dps310_temp_workaround(data); } static int dps310_get_pres_precision(struct dps310_data *data) { int rc; int val; rc = regmap_read(data->regmap, DPS310_PRS_CFG, &val); if (rc < 0) return rc; return BIT(val & GENMASK(2, 0)); } static int dps310_get_temp_precision(struct dps310_data *data) { int rc; int val; rc = regmap_read(data->regmap, DPS310_TMP_CFG, &val); if (rc < 0) return rc; /* * Scale factor is bottom 4 bits of the register, but 1111 is * reserved so just grab bottom three */ return BIT(val & GENMASK(2, 0)); } /* Called with lock held */ static int dps310_set_pres_precision(struct dps310_data *data, int val) { int rc; u8 shift_en; if (val < 0 || val > 128) return -EINVAL; shift_en = val >= 16 ? DPS310_PRS_SHIFT_EN : 0; rc = regmap_write_bits(data->regmap, DPS310_CFG_REG, DPS310_PRS_SHIFT_EN, shift_en); if (rc) return rc; return regmap_update_bits(data->regmap, DPS310_PRS_CFG, DPS310_PRS_PRC_BITS, ilog2(val)); } /* Called with lock held */ static int dps310_set_temp_precision(struct dps310_data *data, int val) { int rc; u8 shift_en; if (val < 0 || val > 128) return -EINVAL; shift_en = val >= 16 ? DPS310_TMP_SHIFT_EN : 0; rc = regmap_write_bits(data->regmap, DPS310_CFG_REG, DPS310_TMP_SHIFT_EN, shift_en); if (rc) return rc; return regmap_update_bits(data->regmap, DPS310_TMP_CFG, DPS310_TMP_PRC_BITS, ilog2(val)); } /* Called with lock held */ static int dps310_set_pres_samp_freq(struct dps310_data *data, int freq) { u8 val; if (freq < 0 || freq > 128) return -EINVAL; val = ilog2(freq) << 4; return regmap_update_bits(data->regmap, DPS310_PRS_CFG, DPS310_PRS_RATE_BITS, val); } /* Called with lock held */ static int dps310_set_temp_samp_freq(struct dps310_data *data, int freq) { u8 val; if (freq < 0 || freq > 128) return -EINVAL; val = ilog2(freq) << 4; return regmap_update_bits(data->regmap, DPS310_TMP_CFG, DPS310_TMP_RATE_BITS, val); } static int dps310_get_pres_samp_freq(struct dps310_data *data) { int rc; int val; rc = regmap_read(data->regmap, DPS310_PRS_CFG, &val); if (rc < 0) return rc; return BIT((val & DPS310_PRS_RATE_BITS) >> 4); } static int dps310_get_temp_samp_freq(struct dps310_data *data) { int rc; int val; rc = regmap_read(data->regmap, DPS310_TMP_CFG, &val); if (rc < 0) return rc; return BIT((val & DPS310_TMP_RATE_BITS) >> 4); } static int dps310_get_pres_k(struct dps310_data *data) { int rc = dps310_get_pres_precision(data); if (rc < 0) return rc; return scale_factors[ilog2(rc)]; } static int dps310_get_temp_k(struct dps310_data *data) { int rc = dps310_get_temp_precision(data); if (rc < 0) return rc; return scale_factors[ilog2(rc)]; } static int dps310_reset_wait(struct dps310_data *data) { int rc; rc = regmap_write(data->regmap, DPS310_RESET, DPS310_RESET_MAGIC); if (rc) return rc; /* Wait for device chip access: 2.5ms in specification */ usleep_range(2500, 12000); return 0; } static int dps310_reset_reinit(struct dps310_data *data) { int rc; rc = dps310_reset_wait(data); if (rc) return rc; return dps310_startup(data); } static int dps310_ready_status(struct dps310_data *data, int ready_bit, int timeout) { int sleep = DPS310_POLL_SLEEP_US(timeout); int ready; return regmap_read_poll_timeout(data->regmap, DPS310_MEAS_CFG, ready, ready & ready_bit, sleep, timeout); } static int dps310_ready(struct dps310_data *data, int ready_bit, int timeout) { int rc; rc = dps310_ready_status(data, ready_bit, timeout); if (rc) { if (rc == -ETIMEDOUT && !data->timeout_recovery_failed) { /* Reset and reinitialize the chip. */ if (dps310_reset_reinit(data)) { data->timeout_recovery_failed = true; } else { /* Try again to get sensor ready status. */ if (dps310_ready_status(data, ready_bit, timeout)) data->timeout_recovery_failed = true; else return 0; } } return rc; } data->timeout_recovery_failed = false; return 0; } static int dps310_read_pres_raw(struct dps310_data *data) { int rc; int rate; int timeout; s32 raw; u8 val[3]; if (mutex_lock_interruptible(&data->lock)) return -EINTR; rate = dps310_get_pres_samp_freq(data); timeout = DPS310_POLL_TIMEOUT_US(rate); /* Poll for sensor readiness; base the timeout upon the sample rate. */ rc = dps310_ready(data, DPS310_PRS_RDY, timeout); if (rc) goto done; rc = regmap_bulk_read(data->regmap, DPS310_PRS_BASE, val, sizeof(val)); if (rc < 0) goto done; raw = (val[0] << 16) | (val[1] << 8) | val[2]; data->pressure_raw = sign_extend32(raw, 23); done: mutex_unlock(&data->lock); return rc; } /* Called with lock held */ static int dps310_read_temp_ready(struct dps310_data *data) { int rc; u8 val[3]; s32 raw; rc = regmap_bulk_read(data->regmap, DPS310_TMP_BASE, val, sizeof(val)); if (rc < 0) return rc; raw = (val[0] << 16) | (val[1] << 8) | val[2]; data->temp_raw = sign_extend32(raw, 23); return 0; } static int dps310_read_temp_raw(struct dps310_data *data) { int rc; int rate; int timeout; if (mutex_lock_interruptible(&data->lock)) return -EINTR; rate = dps310_get_temp_samp_freq(data); timeout = DPS310_POLL_TIMEOUT_US(rate); /* Poll for sensor readiness; base the timeout upon the sample rate. */ rc = dps310_ready(data, DPS310_TMP_RDY, timeout); if (rc) goto done; rc = dps310_read_temp_ready(data); done: mutex_unlock(&data->lock); return rc; } static bool dps310_is_writeable_reg(struct device *dev, unsigned int reg) { switch (reg) { case DPS310_PRS_CFG: case DPS310_TMP_CFG: case DPS310_MEAS_CFG: case DPS310_CFG_REG: case DPS310_RESET: /* No documentation available on the registers below */ case 0x0e: case 0x0f: case 0x62: return true; default: return false; } } static bool dps310_is_volatile_reg(struct device *dev, unsigned int reg) { switch (reg) { case DPS310_PRS_B0: case DPS310_PRS_B1: case DPS310_PRS_B2: case DPS310_TMP_B0: case DPS310_TMP_B1: case DPS310_TMP_B2: case DPS310_MEAS_CFG: case 0x32: /* No documentation available on this register */ return true; default: return false; } } static int dps310_write_raw(struct iio_dev *iio, struct iio_chan_spec const *chan, int val, int val2, long mask) { int rc; struct dps310_data *data = iio_priv(iio); if (mutex_lock_interruptible(&data->lock)) return -EINTR; switch (mask) { case IIO_CHAN_INFO_SAMP_FREQ: switch (chan->type) { case IIO_PRESSURE: rc = dps310_set_pres_samp_freq(data, val); break; case IIO_TEMP: rc = dps310_set_temp_samp_freq(data, val); break; default: rc = -EINVAL; break; } break; case IIO_CHAN_INFO_OVERSAMPLING_RATIO: switch (chan->type) { case IIO_PRESSURE: rc = dps310_set_pres_precision(data, val); break; case IIO_TEMP: rc = dps310_set_temp_precision(data, val); break; default: rc = -EINVAL; break; } break; default: rc = -EINVAL; break; } mutex_unlock(&data->lock); return rc; } static int dps310_calculate_pressure(struct dps310_data *data) { int i; int rc; int t_ready; int kpi = dps310_get_pres_k(data); int kti = dps310_get_temp_k(data); s64 rem = 0ULL; s64 pressure = 0ULL; s64 p; s64 t; s64 denoms[7]; s64 nums[7]; s64 rems[7]; s64 kp; s64 kt; if (kpi < 0) return kpi; if (kti < 0) return kti; kp = (s64)kpi; kt = (s64)kti; /* Refresh temp if it's ready, otherwise just use the latest value */ if (mutex_trylock(&data->lock)) { rc = regmap_read(data->regmap, DPS310_MEAS_CFG, &t_ready); if (rc >= 0 && t_ready & DPS310_TMP_RDY) dps310_read_temp_ready(data); mutex_unlock(&data->lock); } p = (s64)data->pressure_raw; t = (s64)data->temp_raw; /* Section 4.9.1 of the DPS310 spec; algebra'd to avoid underflow */ nums[0] = (s64)data->c00; denoms[0] = 1LL; nums[1] = p * (s64)data->c10; denoms[1] = kp; nums[2] = p * p * (s64)data->c20; denoms[2] = kp * kp; nums[3] = p * p * p * (s64)data->c30; denoms[3] = kp * kp * kp; nums[4] = t * (s64)data->c01; denoms[4] = kt; nums[5] = t * p * (s64)data->c11; denoms[5] = kp * kt; nums[6] = t * p * p * (s64)data->c21; denoms[6] = kp * kp * kt; /* Kernel lacks a div64_s64_rem function; denoms are all positive */ for (i = 0; i < 7; ++i) { u64 irem; if (nums[i] < 0LL) { pressure -= div64_u64_rem(-nums[i], denoms[i], &irem); rems[i] = -irem; } else { pressure += div64_u64_rem(nums[i], denoms[i], &irem); rems[i] = (s64)irem; } } /* Increase precision and calculate the remainder sum */ for (i = 0; i < 7; ++i) rem += div64_s64((s64)rems[i] * 1000000000LL, denoms[i]); pressure += div_s64(rem, 1000000000LL); if (pressure < 0LL) return -ERANGE; return (int)min_t(s64, pressure, INT_MAX); } static int dps310_read_pressure(struct dps310_data *data, int *val, int *val2, long mask) { int rc; switch (mask) { case IIO_CHAN_INFO_SAMP_FREQ: rc = dps310_get_pres_samp_freq(data); if (rc < 0) return rc; *val = rc; return IIO_VAL_INT; case IIO_CHAN_INFO_PROCESSED: rc = dps310_read_pres_raw(data); if (rc) return rc; rc = dps310_calculate_pressure(data); if (rc < 0) return rc; *val = rc; *val2 = 1000; /* Convert Pa to KPa per IIO ABI */ return IIO_VAL_FRACTIONAL; case IIO_CHAN_INFO_OVERSAMPLING_RATIO: rc = dps310_get_pres_precision(data); if (rc < 0) return rc; *val = rc; return IIO_VAL_INT; default: return -EINVAL; } } static int dps310_calculate_temp(struct dps310_data *data) { s64 c0; s64 t; int kt = dps310_get_temp_k(data); if (kt < 0) return kt; /* Obtain inverse-scaled offset */ c0 = div_s64((s64)kt * (s64)data->c0, 2); /* Add the offset to the unscaled temperature */ t = c0 + ((s64)data->temp_raw * (s64)data->c1); /* Convert to milliCelsius and scale the temperature */ return (int)div_s64(t * 1000LL, kt); } static int dps310_read_temp(struct dps310_data *data, int *val, int *val2, long mask) { int rc; switch (mask) { case IIO_CHAN_INFO_SAMP_FREQ: rc = dps310_get_temp_samp_freq(data); if (rc < 0) return rc; *val = rc; return IIO_VAL_INT; case IIO_CHAN_INFO_PROCESSED: rc = dps310_read_temp_raw(data); if (rc) return rc; rc = dps310_calculate_temp(data); if (rc < 0) return rc; *val = rc; return IIO_VAL_INT; case IIO_CHAN_INFO_OVERSAMPLING_RATIO: rc = dps310_get_temp_precision(data); if (rc < 0) return rc; *val = rc; return IIO_VAL_INT; default: return -EINVAL; } } static int dps310_read_raw(struct iio_dev *iio, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { struct dps310_data *data = iio_priv(iio); switch (chan->type) { case IIO_PRESSURE: return dps310_read_pressure(data, val, val2, mask); case IIO_TEMP: return dps310_read_temp(data, val, val2, mask); default: return -EINVAL; } } static void dps310_reset(void *action_data) { struct dps310_data *data = action_data; dps310_reset_wait(data); } static const struct regmap_config dps310_regmap_config = { .reg_bits = 8, .val_bits = 8, .writeable_reg = dps310_is_writeable_reg, .volatile_reg = dps310_is_volatile_reg, .cache_type = REGCACHE_RBTREE, .max_register = 0x62, /* No documentation available on this register */ }; static const struct iio_info dps310_info = { .read_raw = dps310_read_raw, .write_raw = dps310_write_raw, }; static int dps310_probe(struct i2c_client *client) { const struct i2c_device_id *id = i2c_client_get_device_id(client); struct dps310_data *data; struct iio_dev *iio; int rc; iio = devm_iio_device_alloc(&client->dev, sizeof(*data)); if (!iio) return -ENOMEM; data = iio_priv(iio); data->client = client; mutex_init(&data->lock); iio->name = id->name; iio->channels = dps310_channels; iio->num_channels = ARRAY_SIZE(dps310_channels); iio->info = &dps310_info; iio->modes = INDIO_DIRECT_MODE; data->regmap = devm_regmap_init_i2c(client, &dps310_regmap_config); if (IS_ERR(data->regmap)) return PTR_ERR(data->regmap); /* Register to run the device reset when the device is removed */ rc = devm_add_action_or_reset(&client->dev, dps310_reset, data); if (rc) return rc; rc = dps310_startup(data); if (rc) return rc; rc = devm_iio_device_register(&client->dev, iio); if (rc) return rc; i2c_set_clientdata(client, iio); return 0; } static const struct i2c_device_id dps310_id[] = { { DPS310_DEV_NAME, 0 }, {} }; MODULE_DEVICE_TABLE(i2c, dps310_id); static const struct acpi_device_id dps310_acpi_match[] = { { "IFX3100" }, {} }; MODULE_DEVICE_TABLE(acpi, dps310_acpi_match); static struct i2c_driver dps310_driver = { .driver = { .name = DPS310_DEV_NAME, .acpi_match_table = dps310_acpi_match, }, .probe_new = dps310_probe, .id_table = dps310_id, }; module_i2c_driver(dps310_driver); MODULE_AUTHOR("Joel Stanley <joel@jms.id.au>"); MODULE_DESCRIPTION("Infineon DPS310 pressure and temperature sensor"); MODULE_LICENSE("GPL v2"); |