Loading...
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 | // SPDX-License-Identifier: GPL-2.0 /* * mlx90635.c - Melexis MLX90635 contactless IR temperature sensor * * Copyright (c) 2023 Melexis <cmo@melexis.com> * * Driver for the Melexis MLX90635 I2C 16-bit IR thermopile sensor */ #include <linux/bitfield.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/err.h> #include <linux/gpio/consumer.h> #include <linux/i2c.h> #include <linux/iopoll.h> #include <linux/jiffies.h> #include <linux/kernel.h> #include <linux/limits.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/math64.h> #include <linux/pm_runtime.h> #include <linux/regmap.h> #include <linux/regulator/consumer.h> #include <linux/iio/iio.h> /* Memory sections addresses */ #define MLX90635_ADDR_RAM 0x0000 /* Start address of ram */ #define MLX90635_ADDR_EEPROM 0x0018 /* Start address of user eeprom */ /* EEPROM addresses - used at startup */ #define MLX90635_EE_I2C_CFG 0x0018 /* I2C address register initial value */ #define MLX90635_EE_CTRL1 0x001A /* Control register1 initial value */ #define MLX90635_EE_CTRL2 0x001C /* Control register2 initial value */ #define MLX90635_EE_Ha 0x001E /* Ha customer calib value reg 16bit */ #define MLX90635_EE_Hb 0x0020 /* Hb customer calib value reg 16bit */ #define MLX90635_EE_Fa 0x0026 /* Fa calibration register 32bit */ #define MLX90635_EE_FASCALE 0x002A /* Scaling coefficient for Fa register 16bit */ #define MLX90635_EE_Ga 0x002C /* Ga calibration register 16bit */ #define MLX90635_EE_Fb 0x002E /* Fb calibration register 16bit */ #define MLX90635_EE_Ea 0x0030 /* Ea calibration register 32bit */ #define MLX90635_EE_Eb 0x0034 /* Eb calibration register 32bit */ #define MLX90635_EE_P_G 0x0038 /* P_G calibration register 16bit */ #define MLX90635_EE_P_O 0x003A /* P_O calibration register 16bit */ #define MLX90635_EE_Aa 0x003C /* Aa calibration register 16bit */ #define MLX90635_EE_VERSION 0x003E /* Version bits 4:7 and 12:15 */ #define MLX90635_EE_Gb 0x0040 /* Gb calibration register 16bit */ /* Device status register - volatile */ #define MLX90635_REG_STATUS 0x0000 #define MLX90635_STAT_BUSY BIT(6) /* Device busy indicator */ #define MLX90635_STAT_BRST BIT(5) /* Brown out reset indicator */ #define MLX90635_STAT_CYCLE_POS GENMASK(4, 2) /* Data position */ #define MLX90635_STAT_END_CONV BIT(1) /* End of conversion indicator */ #define MLX90635_STAT_DATA_RDY BIT(0) /* Data ready indicator */ /* EEPROM control register address - volatile */ #define MLX90635_REG_EE 0x000C #define MLX90635_EE_ACTIVE BIT(4) /* Power-on EEPROM */ #define MLX90635_EE_BUSY_MASK BIT(15) #define MLX90635_REG_CMD 0x0010 /* Command register address */ /* Control register1 address - volatile */ #define MLX90635_REG_CTRL1 0x0014 #define MLX90635_CTRL1_REFRESH_RATE_MASK GENMASK(2, 0) #define MLX90635_CTRL1_RES_CTRL_MASK GENMASK(4, 3) #define MLX90635_CTRL1_TABLE_MASK BIT(15) /* Table select */ /* Control register2 address - volatile */ #define MLX90635_REG_CTRL2 0x0016 #define MLX90635_CTRL2_BURST_CNT_MASK GENMASK(10, 6) /* Burst count */ #define MLX90635_CTRL2_MODE_MASK GENMASK(12, 11) /* Power mode */ #define MLX90635_CTRL2_SOB_MASK BIT(15) /* PowerModes statuses */ #define MLX90635_PWR_STATUS_HALT 0 #define MLX90635_PWR_STATUS_SLEEP_STEP 1 #define MLX90635_PWR_STATUS_STEP 2 #define MLX90635_PWR_STATUS_CONTINUOUS 3 /* Measurement data addresses */ #define MLX90635_RESULT_1 0x0002 #define MLX90635_RESULT_2 0x0004 #define MLX90635_RESULT_3 0x0006 #define MLX90635_RESULT_4 0x0008 #define MLX90635_RESULT_5 0x000A /* Timings (ms) */ #define MLX90635_TIMING_RST_MIN 200 /* Minimum time after addressed reset command */ #define MLX90635_TIMING_RST_MAX 250 /* Maximum time after addressed reset command */ #define MLX90635_TIMING_POLLING 10000 /* Time between bit polling*/ #define MLX90635_TIMING_EE_ACTIVE_MIN 100 /* Minimum time after activating the EEPROM for read */ #define MLX90635_TIMING_EE_ACTIVE_MAX 150 /* Maximum time after activating the EEPROM for read */ /* Magic constants */ #define MLX90635_ID_DSPv1 0x01 /* EEPROM DSP version */ #define MLX90635_RESET_CMD 0x0006 /* Reset sensor (address or global) */ #define MLX90635_MAX_MEAS_NUM 31 /* Maximum number of measurements in list */ #define MLX90635_PTAT_DIV 12 /* Used to divide the PTAT value in pre-processing */ #define MLX90635_IR_DIV 24 /* Used to divide the IR value in pre-processing */ #define MLX90635_SLEEP_DELAY_MS 6000 /* Autosleep delay */ #define MLX90635_MEAS_MAX_TIME 2000 /* Max measurement time in ms for the lowest refresh rate */ #define MLX90635_READ_RETRIES 100 /* Number of read retries before quitting with timeout error */ #define MLX90635_VERSION_MASK (GENMASK(15, 12) | GENMASK(7, 4)) #define MLX90635_DSP_VERSION(reg) (((reg & GENMASK(14, 12)) >> 9) | ((reg & GENMASK(6, 4)) >> 4)) #define MLX90635_DSP_FIXED BIT(15) /** * struct mlx90635_data - private data for the MLX90635 device * @client: I2C client of the device * @lock: Internal mutex because multiple reads are needed for single triggered * measurement to ensure data consistency * @regmap: Regmap of the device registers * @regmap_ee: Regmap of the device EEPROM which can be cached * @emissivity: Object emissivity from 0 to 1000 where 1000 = 1 * @regulator: Regulator of the device * @powerstatus: Current POWER status of the device * @interaction_ts: Timestamp of the last temperature read that is used * for power management in jiffies */ struct mlx90635_data { struct i2c_client *client; struct mutex lock; struct regmap *regmap; struct regmap *regmap_ee; u16 emissivity; struct regulator *regulator; int powerstatus; unsigned long interaction_ts; }; static const struct regmap_range mlx90635_volatile_reg_range[] = { regmap_reg_range(MLX90635_REG_STATUS, MLX90635_REG_STATUS), regmap_reg_range(MLX90635_RESULT_1, MLX90635_RESULT_5), regmap_reg_range(MLX90635_REG_EE, MLX90635_REG_EE), regmap_reg_range(MLX90635_REG_CMD, MLX90635_REG_CMD), regmap_reg_range(MLX90635_REG_CTRL1, MLX90635_REG_CTRL2), }; static const struct regmap_access_table mlx90635_volatile_regs_tbl = { .yes_ranges = mlx90635_volatile_reg_range, .n_yes_ranges = ARRAY_SIZE(mlx90635_volatile_reg_range), }; static const struct regmap_range mlx90635_read_reg_range[] = { regmap_reg_range(MLX90635_REG_STATUS, MLX90635_REG_STATUS), regmap_reg_range(MLX90635_RESULT_1, MLX90635_RESULT_5), regmap_reg_range(MLX90635_REG_EE, MLX90635_REG_EE), regmap_reg_range(MLX90635_REG_CMD, MLX90635_REG_CMD), regmap_reg_range(MLX90635_REG_CTRL1, MLX90635_REG_CTRL2), }; static const struct regmap_access_table mlx90635_readable_regs_tbl = { .yes_ranges = mlx90635_read_reg_range, .n_yes_ranges = ARRAY_SIZE(mlx90635_read_reg_range), }; static const struct regmap_range mlx90635_no_write_reg_range[] = { regmap_reg_range(MLX90635_RESULT_1, MLX90635_RESULT_5), }; static const struct regmap_access_table mlx90635_writeable_regs_tbl = { .no_ranges = mlx90635_no_write_reg_range, .n_no_ranges = ARRAY_SIZE(mlx90635_no_write_reg_range), }; static const struct regmap_config mlx90635_regmap = { .name = "mlx90635-registers", .reg_stride = 1, .reg_bits = 16, .val_bits = 16, .volatile_table = &mlx90635_volatile_regs_tbl, .rd_table = &mlx90635_readable_regs_tbl, .wr_table = &mlx90635_writeable_regs_tbl, .use_single_read = true, .use_single_write = true, .can_multi_write = false, .reg_format_endian = REGMAP_ENDIAN_BIG, .val_format_endian = REGMAP_ENDIAN_BIG, .cache_type = REGCACHE_RBTREE, }; static const struct regmap_range mlx90635_read_ee_range[] = { regmap_reg_range(MLX90635_EE_I2C_CFG, MLX90635_EE_CTRL2), regmap_reg_range(MLX90635_EE_Ha, MLX90635_EE_Gb), }; static const struct regmap_access_table mlx90635_readable_ees_tbl = { .yes_ranges = mlx90635_read_ee_range, .n_yes_ranges = ARRAY_SIZE(mlx90635_read_ee_range), }; static const struct regmap_range mlx90635_no_write_ee_range[] = { regmap_reg_range(MLX90635_ADDR_EEPROM, MLX90635_EE_Gb), }; static const struct regmap_access_table mlx90635_writeable_ees_tbl = { .no_ranges = mlx90635_no_write_ee_range, .n_no_ranges = ARRAY_SIZE(mlx90635_no_write_ee_range), }; static const struct regmap_config mlx90635_regmap_ee = { .name = "mlx90635-eeprom", .reg_stride = 1, .reg_bits = 16, .val_bits = 16, .volatile_table = NULL, .rd_table = &mlx90635_readable_ees_tbl, .wr_table = &mlx90635_writeable_ees_tbl, .use_single_read = true, .use_single_write = true, .can_multi_write = false, .reg_format_endian = REGMAP_ENDIAN_BIG, .val_format_endian = REGMAP_ENDIAN_BIG, .cache_type = REGCACHE_RBTREE, }; /** * mlx90635_reset_delay() - Give the mlx90635 some time to reset properly * If this is not done, the following I2C command(s) will not be accepted. */ static void mlx90635_reset_delay(void) { usleep_range(MLX90635_TIMING_RST_MIN, MLX90635_TIMING_RST_MAX); } static int mlx90635_pwr_sleep_step(struct mlx90635_data *data) { int ret; if (data->powerstatus == MLX90635_PWR_STATUS_SLEEP_STEP) return 0; ret = regmap_write_bits(data->regmap, MLX90635_REG_CTRL2, MLX90635_CTRL2_MODE_MASK, FIELD_PREP(MLX90635_CTRL2_MODE_MASK, MLX90635_PWR_STATUS_SLEEP_STEP)); if (ret < 0) return ret; data->powerstatus = MLX90635_PWR_STATUS_SLEEP_STEP; return 0; } static int mlx90635_pwr_continuous(struct mlx90635_data *data) { int ret; if (data->powerstatus == MLX90635_PWR_STATUS_CONTINUOUS) return 0; ret = regmap_write_bits(data->regmap, MLX90635_REG_CTRL2, MLX90635_CTRL2_MODE_MASK, FIELD_PREP(MLX90635_CTRL2_MODE_MASK, MLX90635_PWR_STATUS_CONTINUOUS)); if (ret < 0) return ret; data->powerstatus = MLX90635_PWR_STATUS_CONTINUOUS; return 0; } static int mlx90635_read_ee_register(struct regmap *regmap, u16 reg_lsb, s32 *reg_value) { unsigned int read; u32 value; int ret; ret = regmap_read(regmap, reg_lsb + 2, &read); if (ret < 0) return ret; value = read; ret = regmap_read(regmap, reg_lsb, &read); if (ret < 0) return ret; *reg_value = (read << 16) | (value & 0xffff); return 0; } static int mlx90635_read_ee_ambient(struct regmap *regmap, s16 *PG, s16 *PO, s16 *Gb) { unsigned int read_tmp; int ret; ret = regmap_read(regmap, MLX90635_EE_P_O, &read_tmp); if (ret < 0) return ret; *PO = (s16)read_tmp; ret = regmap_read(regmap, MLX90635_EE_P_G, &read_tmp); if (ret < 0) return ret; *PG = (s16)read_tmp; ret = regmap_read(regmap, MLX90635_EE_Gb, &read_tmp); if (ret < 0) return ret; *Gb = (u16)read_tmp; return 0; } static int mlx90635_read_ee_object(struct regmap *regmap, u32 *Ea, u32 *Eb, u32 *Fa, s16 *Fb, s16 *Ga, s16 *Gb, s16 *Ha, s16 *Hb, u16 *Fa_scale) { unsigned int read_tmp; int ret; ret = mlx90635_read_ee_register(regmap, MLX90635_EE_Ea, Ea); if (ret < 0) return ret; ret = mlx90635_read_ee_register(regmap, MLX90635_EE_Eb, Eb); if (ret < 0) return ret; ret = mlx90635_read_ee_register(regmap, MLX90635_EE_Fa, Fa); if (ret < 0) return ret; ret = regmap_read(regmap, MLX90635_EE_Ha, &read_tmp); if (ret < 0) return ret; *Ha = (s16)read_tmp; ret = regmap_read(regmap, MLX90635_EE_Hb, &read_tmp); if (ret < 0) return ret; *Hb = (s16)read_tmp; ret = regmap_read(regmap, MLX90635_EE_Ga, &read_tmp); if (ret < 0) return ret; *Ga = (s16)read_tmp; ret = regmap_read(regmap, MLX90635_EE_Gb, &read_tmp); if (ret < 0) return ret; *Gb = (s16)read_tmp; ret = regmap_read(regmap, MLX90635_EE_Fb, &read_tmp); if (ret < 0) return ret; *Fb = (s16)read_tmp; ret = regmap_read(regmap, MLX90635_EE_FASCALE, &read_tmp); if (ret < 0) return ret; *Fa_scale = (u16)read_tmp; return 0; } static int mlx90635_calculate_dataset_ready_time(struct mlx90635_data *data, int *refresh_time) { unsigned int reg; int ret; ret = regmap_read(data->regmap, MLX90635_REG_CTRL1, ®); if (ret < 0) return ret; *refresh_time = 2 * (MLX90635_MEAS_MAX_TIME >> FIELD_GET(MLX90635_CTRL1_REFRESH_RATE_MASK, reg)) + 80; return 0; } static int mlx90635_perform_measurement_burst(struct mlx90635_data *data) { unsigned int reg_status; int refresh_time; int ret; ret = regmap_write_bits(data->regmap, MLX90635_REG_STATUS, MLX90635_STAT_END_CONV, MLX90635_STAT_END_CONV); if (ret < 0) return ret; ret = mlx90635_calculate_dataset_ready_time(data, &refresh_time); if (ret < 0) return ret; ret = regmap_write_bits(data->regmap, MLX90635_REG_CTRL2, FIELD_PREP(MLX90635_CTRL2_SOB_MASK, 1), FIELD_PREP(MLX90635_CTRL2_SOB_MASK, 1)); if (ret < 0) return ret; msleep(refresh_time); /* Wait minimum time for dataset to be ready */ ret = regmap_read_poll_timeout(data->regmap, MLX90635_REG_STATUS, reg_status, (!(reg_status & MLX90635_STAT_END_CONV)) == 0, MLX90635_TIMING_POLLING, MLX90635_READ_RETRIES * 10000); if (ret < 0) { dev_err(&data->client->dev, "data not ready"); return -ETIMEDOUT; } return 0; } static int mlx90635_read_ambient_raw(struct regmap *regmap, s16 *ambient_new_raw, s16 *ambient_old_raw) { unsigned int read_tmp; int ret; ret = regmap_read(regmap, MLX90635_RESULT_2, &read_tmp); if (ret < 0) return ret; *ambient_new_raw = (s16)read_tmp; ret = regmap_read(regmap, MLX90635_RESULT_3, &read_tmp); if (ret < 0) return ret; *ambient_old_raw = (s16)read_tmp; return 0; } static int mlx90635_read_object_raw(struct regmap *regmap, s16 *object_raw) { unsigned int read_tmp; s16 read; int ret; ret = regmap_read(regmap, MLX90635_RESULT_1, &read_tmp); if (ret < 0) return ret; read = (s16)read_tmp; ret = regmap_read(regmap, MLX90635_RESULT_4, &read_tmp); if (ret < 0) return ret; *object_raw = (read - (s16)read_tmp) / 2; return 0; } static int mlx90635_read_all_channel(struct mlx90635_data *data, s16 *ambient_new_raw, s16 *ambient_old_raw, s16 *object_raw) { int ret; mutex_lock(&data->lock); if (data->powerstatus == MLX90635_PWR_STATUS_SLEEP_STEP) { /* Trigger measurement in Sleep Step mode */ ret = mlx90635_perform_measurement_burst(data); if (ret < 0) goto read_unlock; } ret = mlx90635_read_ambient_raw(data->regmap, ambient_new_raw, ambient_old_raw); if (ret < 0) goto read_unlock; ret = mlx90635_read_object_raw(data->regmap, object_raw); read_unlock: mutex_unlock(&data->lock); return ret; } static s64 mlx90635_preprocess_temp_amb(s16 ambient_new_raw, s16 ambient_old_raw, s16 Gb) { s64 VR_Ta, kGb, tmp; kGb = ((s64)Gb * 1000LL) >> 10ULL; VR_Ta = (s64)ambient_old_raw * 1000000LL + kGb * div64_s64(((s64)ambient_new_raw * 1000LL), (MLX90635_PTAT_DIV)); tmp = div64_s64( div64_s64(((s64)ambient_new_raw * 1000000000000LL), (MLX90635_PTAT_DIV)), VR_Ta); return div64_s64(tmp << 19ULL, 1000LL); } static s64 mlx90635_preprocess_temp_obj(s16 object_raw, s16 ambient_new_raw, s16 ambient_old_raw, s16 Gb) { s64 VR_IR, kGb, tmp; kGb = ((s64)Gb * 1000LL) >> 10ULL; VR_IR = (s64)ambient_old_raw * 1000000LL + kGb * (div64_s64((s64)ambient_new_raw * 1000LL, MLX90635_PTAT_DIV)); tmp = div64_s64( div64_s64((s64)(object_raw * 1000000LL), MLX90635_IR_DIV) * 1000000LL, VR_IR); return div64_s64((tmp << 19ULL), 1000LL); } static s32 mlx90635_calc_temp_ambient(s16 ambient_new_raw, s16 ambient_old_raw, u16 P_G, u16 P_O, s16 Gb) { s64 kPG, kPO, AMB; AMB = mlx90635_preprocess_temp_amb(ambient_new_raw, ambient_old_raw, Gb); kPG = ((s64)P_G * 1000000LL) >> 9ULL; kPO = AMB - (((s64)P_O * 1000LL) >> 1ULL); return 30 * 1000LL + div64_s64(kPO * 1000000LL, kPG); } static s32 mlx90635_calc_temp_object_iteration(s32 prev_object_temp, s64 object, s64 TAdut, s64 TAdut4, s16 Ga, u32 Fa, u16 Fa_scale, s16 Fb, s16 Ha, s16 Hb, u16 emissivity) { s64 calcedGa, calcedGb, calcedFa, Alpha_corr; s64 Ha_customer, Hb_customer; Ha_customer = ((s64)Ha * 1000000LL) >> 14ULL; Hb_customer = ((s64)Hb * 100) >> 10ULL; calcedGa = ((s64)((s64)Ga * (prev_object_temp - 35 * 1000LL) * 1000LL)) >> 24LL; calcedGb = ((s64)(Fb * (TAdut - 30 * 1000000LL))) >> 24LL; Alpha_corr = ((s64)((s64)Fa * Ha_customer * 10000LL) >> Fa_scale); Alpha_corr *= ((s64)(1 * 1000000LL + calcedGa + calcedGb)); Alpha_corr = div64_s64(Alpha_corr, 1000LL); Alpha_corr *= emissivity; Alpha_corr = div64_s64(Alpha_corr, 100LL); calcedFa = div64_s64((s64)object * 100000000000LL, Alpha_corr); return (int_sqrt64(int_sqrt64(calcedFa * 100000000LL + TAdut4)) - 27315 - Hb_customer) * 10; } static s64 mlx90635_calc_ta4(s64 TAdut, s64 scale) { return (div64_s64(TAdut, scale) + 27315) * (div64_s64(TAdut, scale) + 27315) * (div64_s64(TAdut, scale) + 27315) * (div64_s64(TAdut, scale) + 27315); } static s32 mlx90635_calc_temp_object(s64 object, s64 ambient, u32 Ea, u32 Eb, s16 Ga, u32 Fa, u16 Fa_scale, s16 Fb, s16 Ha, s16 Hb, u16 tmp_emi) { s64 kTA, kTA0, TAdut, TAdut4; s64 temp = 35000; s8 i; kTA = (Ea * 1000LL) >> 16LL; kTA0 = (Eb * 1000LL) >> 8LL; TAdut = div64_s64(((ambient - kTA0) * 1000000LL), kTA) + 30 * 1000000LL; TAdut4 = mlx90635_calc_ta4(TAdut, 10000LL); /* Iterations of calculation as described in datasheet */ for (i = 0; i < 5; ++i) { temp = mlx90635_calc_temp_object_iteration(temp, object, TAdut, TAdut4, Ga, Fa, Fa_scale, Fb, Ha, Hb, tmp_emi); } return temp; } static int mlx90635_calc_object(struct mlx90635_data *data, int *val) { s16 ambient_new_raw, ambient_old_raw, object_raw; s16 Fb, Ga, Gb, Ha, Hb; s64 object, ambient; u32 Ea, Eb, Fa; u16 Fa_scale; int ret; ret = mlx90635_read_ee_object(data->regmap_ee, &Ea, &Eb, &Fa, &Fb, &Ga, &Gb, &Ha, &Hb, &Fa_scale); if (ret < 0) return ret; ret = mlx90635_read_all_channel(data, &ambient_new_raw, &ambient_old_raw, &object_raw); if (ret < 0) return ret; ambient = mlx90635_preprocess_temp_amb(ambient_new_raw, ambient_old_raw, Gb); object = mlx90635_preprocess_temp_obj(object_raw, ambient_new_raw, ambient_old_raw, Gb); *val = mlx90635_calc_temp_object(object, ambient, Ea, Eb, Ga, Fa, Fa_scale, Fb, Ha, Hb, data->emissivity); return 0; } static int mlx90635_calc_ambient(struct mlx90635_data *data, int *val) { s16 ambient_new_raw, ambient_old_raw; s16 PG, PO, Gb; int ret; ret = mlx90635_read_ee_ambient(data->regmap_ee, &PG, &PO, &Gb); if (ret < 0) return ret; mutex_lock(&data->lock); if (data->powerstatus == MLX90635_PWR_STATUS_SLEEP_STEP) { ret = mlx90635_perform_measurement_burst(data); if (ret < 0) goto read_ambient_unlock; } ret = mlx90635_read_ambient_raw(data->regmap, &ambient_new_raw, &ambient_old_raw); read_ambient_unlock: mutex_unlock(&data->lock); if (ret < 0) return ret; *val = mlx90635_calc_temp_ambient(ambient_new_raw, ambient_old_raw, PG, PO, Gb); return ret; } static int mlx90635_get_refresh_rate(struct mlx90635_data *data, unsigned int *refresh_rate) { unsigned int reg; int ret; ret = regmap_read(data->regmap, MLX90635_REG_CTRL1, ®); if (ret < 0) return ret; *refresh_rate = FIELD_GET(MLX90635_CTRL1_REFRESH_RATE_MASK, reg); return 0; } static const struct { int val; int val2; } mlx90635_freqs[] = { { 0, 200000 }, { 0, 500000 }, { 0, 900000 }, { 1, 700000 }, { 3, 0 }, { 4, 800000 }, { 6, 900000 }, { 8, 900000 } }; /** * mlx90635_pm_interaction_wakeup() - Measure time between user interactions to change powermode * @data: pointer to mlx90635_data object containing interaction_ts information * * Switch to continuous mode when interaction is faster than MLX90635_MEAS_MAX_TIME. Update the * interaction_ts for each function call with the jiffies to enable measurement between function * calls. Initial value of the interaction_ts needs to be set before this function call. */ static int mlx90635_pm_interaction_wakeup(struct mlx90635_data *data) { unsigned long now; int ret; now = jiffies; if (time_in_range(now, data->interaction_ts, data->interaction_ts + msecs_to_jiffies(MLX90635_MEAS_MAX_TIME + 100))) { ret = mlx90635_pwr_continuous(data); if (ret < 0) return ret; } data->interaction_ts = now; return 0; } static int mlx90635_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *channel, int *val, int *val2, long mask) { struct mlx90635_data *data = iio_priv(indio_dev); int ret; int cr; pm_runtime_get_sync(&data->client->dev); ret = mlx90635_pm_interaction_wakeup(data); if (ret < 0) goto mlx90635_read_raw_pm; switch (mask) { case IIO_CHAN_INFO_PROCESSED: switch (channel->channel2) { case IIO_MOD_TEMP_AMBIENT: ret = mlx90635_calc_ambient(data, val); if (ret < 0) goto mlx90635_read_raw_pm; ret = IIO_VAL_INT; break; case IIO_MOD_TEMP_OBJECT: ret = mlx90635_calc_object(data, val); if (ret < 0) goto mlx90635_read_raw_pm; ret = IIO_VAL_INT; break; default: ret = -EINVAL; break; } break; case IIO_CHAN_INFO_CALIBEMISSIVITY: if (data->emissivity == 1000) { *val = 1; *val2 = 0; } else { *val = 0; *val2 = data->emissivity * 1000; } ret = IIO_VAL_INT_PLUS_MICRO; break; case IIO_CHAN_INFO_SAMP_FREQ: ret = mlx90635_get_refresh_rate(data, &cr); if (ret < 0) goto mlx90635_read_raw_pm; *val = mlx90635_freqs[cr].val; *val2 = mlx90635_freqs[cr].val2; ret = IIO_VAL_INT_PLUS_MICRO; break; default: ret = -EINVAL; break; } mlx90635_read_raw_pm: pm_runtime_mark_last_busy(&data->client->dev); pm_runtime_put_autosuspend(&data->client->dev); return ret; } static int mlx90635_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *channel, int val, int val2, long mask) { struct mlx90635_data *data = iio_priv(indio_dev); int ret; int i; switch (mask) { case IIO_CHAN_INFO_CALIBEMISSIVITY: /* Confirm we are within 0 and 1.0 */ if (val < 0 || val2 < 0 || val > 1 || (val == 1 && val2 != 0)) return -EINVAL; data->emissivity = val * 1000 + val2 / 1000; return 0; case IIO_CHAN_INFO_SAMP_FREQ: for (i = 0; i < ARRAY_SIZE(mlx90635_freqs); i++) { if (val == mlx90635_freqs[i].val && val2 == mlx90635_freqs[i].val2) break; } if (i == ARRAY_SIZE(mlx90635_freqs)) return -EINVAL; ret = regmap_write_bits(data->regmap, MLX90635_REG_CTRL1, MLX90635_CTRL1_REFRESH_RATE_MASK, i); return ret; default: return -EINVAL; } } static int mlx90635_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, const int **vals, int *type, int *length, long mask) { switch (mask) { case IIO_CHAN_INFO_SAMP_FREQ: *vals = (int *)mlx90635_freqs; *type = IIO_VAL_INT_PLUS_MICRO; *length = 2 * ARRAY_SIZE(mlx90635_freqs); return IIO_AVAIL_LIST; default: return -EINVAL; } } static const struct iio_chan_spec mlx90635_channels[] = { { .type = IIO_TEMP, .modified = 1, .channel2 = IIO_MOD_TEMP_AMBIENT, .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_SAMP_FREQ), }, { .type = IIO_TEMP, .modified = 1, .channel2 = IIO_MOD_TEMP_OBJECT, .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | BIT(IIO_CHAN_INFO_CALIBEMISSIVITY), .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_SAMP_FREQ), }, }; static const struct iio_info mlx90635_info = { .read_raw = mlx90635_read_raw, .write_raw = mlx90635_write_raw, .read_avail = mlx90635_read_avail, }; static void mlx90635_sleep(void *_data) { struct mlx90635_data *data = _data; mlx90635_pwr_sleep_step(data); } static int mlx90635_suspend(struct mlx90635_data *data) { return mlx90635_pwr_sleep_step(data); } static int mlx90635_wakeup(struct mlx90635_data *data) { s16 Fb, Ga, Gb, Ha, Hb, PG, PO; unsigned int dsp_version; u32 Ea, Eb, Fa; u16 Fa_scale; int ret; regcache_cache_bypass(data->regmap_ee, false); regcache_cache_only(data->regmap_ee, false); regcache_cache_only(data->regmap, false); ret = mlx90635_pwr_continuous(data); if (ret < 0) { dev_err(&data->client->dev, "Switch to continuous mode failed\n"); return ret; } ret = regmap_write_bits(data->regmap, MLX90635_REG_EE, MLX90635_EE_ACTIVE, MLX90635_EE_ACTIVE); if (ret < 0) { dev_err(&data->client->dev, "Powering EEPROM failed\n"); return ret; } usleep_range(MLX90635_TIMING_EE_ACTIVE_MIN, MLX90635_TIMING_EE_ACTIVE_MAX); regcache_mark_dirty(data->regmap_ee); ret = regcache_sync(data->regmap_ee); if (ret < 0) { dev_err(&data->client->dev, "Failed to sync cache: %d\n", ret); return ret; } ret = mlx90635_read_ee_ambient(data->regmap_ee, &PG, &PO, &Gb); if (ret < 0) { dev_err(&data->client->dev, "Failed to read to cache Ambient coefficients EEPROM region: %d\n", ret); return ret; } ret = mlx90635_read_ee_object(data->regmap_ee, &Ea, &Eb, &Fa, &Fb, &Ga, &Gb, &Ha, &Hb, &Fa_scale); if (ret < 0) { dev_err(&data->client->dev, "Failed to read to cache Object coefficients EEPROM region: %d\n", ret); return ret; } ret = regmap_read(data->regmap_ee, MLX90635_EE_VERSION, &dsp_version); if (ret < 0) { dev_err(&data->client->dev, "Failed to read to cache of EEPROM version: %d\n", ret); return ret; } regcache_cache_only(data->regmap_ee, true); return ret; } static void mlx90635_disable_regulator(void *_data) { struct mlx90635_data *data = _data; int ret; ret = regulator_disable(data->regulator); if (ret < 0) dev_err(regmap_get_device(data->regmap), "Failed to disable power regulator: %d\n", ret); } static int mlx90635_enable_regulator(struct mlx90635_data *data) { int ret; ret = regulator_enable(data->regulator); if (ret < 0) { dev_err(regmap_get_device(data->regmap), "Failed to enable power regulator!\n"); return ret; } mlx90635_reset_delay(); return ret; } static int mlx90635_probe(struct i2c_client *client) { struct mlx90635_data *mlx90635; struct iio_dev *indio_dev; unsigned int dsp_version; struct regmap *regmap; struct regmap *regmap_ee; int ret; indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*mlx90635)); if (!indio_dev) return dev_err_probe(&client->dev, -ENOMEM, "failed to allocate device\n"); regmap = devm_regmap_init_i2c(client, &mlx90635_regmap); if (IS_ERR(regmap)) return dev_err_probe(&client->dev, PTR_ERR(regmap), "failed to allocate regmap\n"); regmap_ee = devm_regmap_init_i2c(client, &mlx90635_regmap_ee); if (IS_ERR(regmap)) return dev_err_probe(&client->dev, PTR_ERR(regmap), "failed to allocate regmap\n"); mlx90635 = iio_priv(indio_dev); i2c_set_clientdata(client, indio_dev); mlx90635->client = client; mlx90635->regmap = regmap; mlx90635->regmap_ee = regmap_ee; mlx90635->powerstatus = MLX90635_PWR_STATUS_SLEEP_STEP; mutex_init(&mlx90635->lock); indio_dev->name = "mlx90635"; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->info = &mlx90635_info; indio_dev->channels = mlx90635_channels; indio_dev->num_channels = ARRAY_SIZE(mlx90635_channels); mlx90635->regulator = devm_regulator_get(&client->dev, "vdd"); if (IS_ERR(mlx90635->regulator)) return dev_err_probe(&client->dev, PTR_ERR(mlx90635->regulator), "failed to get vdd regulator"); ret = mlx90635_enable_regulator(mlx90635); if (ret < 0) return ret; ret = devm_add_action_or_reset(&client->dev, mlx90635_disable_regulator, mlx90635); if (ret < 0) return dev_err_probe(&client->dev, ret, "failed to setup regulator cleanup action\n"); ret = mlx90635_wakeup(mlx90635); if (ret < 0) return dev_err_probe(&client->dev, ret, "wakeup failed\n"); ret = devm_add_action_or_reset(&client->dev, mlx90635_sleep, mlx90635); if (ret < 0) return dev_err_probe(&client->dev, ret, "failed to setup low power cleanup\n"); ret = regmap_read(mlx90635->regmap_ee, MLX90635_EE_VERSION, &dsp_version); if (ret < 0) return dev_err_probe(&client->dev, ret, "read of version failed\n"); dsp_version = dsp_version & MLX90635_VERSION_MASK; if (FIELD_GET(MLX90635_DSP_FIXED, dsp_version)) { if (MLX90635_DSP_VERSION(dsp_version) == MLX90635_ID_DSPv1) { dev_dbg(&client->dev, "Detected DSP v1 calibration %x\n", dsp_version); } else { dev_dbg(&client->dev, "Detected Unknown EEPROM calibration %lx\n", MLX90635_DSP_VERSION(dsp_version)); } } else { return dev_err_probe(&client->dev, -EPROTONOSUPPORT, "Wrong fixed top bit %x (expected 0x8X0X)\n", dsp_version); } mlx90635->emissivity = 1000; mlx90635->interaction_ts = jiffies; /* Set initial value */ pm_runtime_get_noresume(&client->dev); pm_runtime_set_active(&client->dev); ret = devm_pm_runtime_enable(&client->dev); if (ret) return dev_err_probe(&client->dev, ret, "failed to enable powermanagement\n"); pm_runtime_set_autosuspend_delay(&client->dev, MLX90635_SLEEP_DELAY_MS); pm_runtime_use_autosuspend(&client->dev); pm_runtime_put_autosuspend(&client->dev); return devm_iio_device_register(&client->dev, indio_dev); } static const struct i2c_device_id mlx90635_id[] = { { "mlx90635" }, { } }; MODULE_DEVICE_TABLE(i2c, mlx90635_id); static const struct of_device_id mlx90635_of_match[] = { { .compatible = "melexis,mlx90635" }, { } }; MODULE_DEVICE_TABLE(of, mlx90635_of_match); static int mlx90635_pm_suspend(struct device *dev) { struct mlx90635_data *data = iio_priv(dev_get_drvdata(dev)); int ret; ret = mlx90635_suspend(data); if (ret < 0) return ret; ret = regulator_disable(data->regulator); if (ret < 0) dev_err(regmap_get_device(data->regmap), "Failed to disable power regulator: %d\n", ret); return ret; } static int mlx90635_pm_resume(struct device *dev) { struct mlx90635_data *data = iio_priv(dev_get_drvdata(dev)); int ret; ret = mlx90635_enable_regulator(data); if (ret < 0) return ret; return mlx90635_wakeup(data); } static int mlx90635_pm_runtime_suspend(struct device *dev) { struct mlx90635_data *data = iio_priv(dev_get_drvdata(dev)); return mlx90635_pwr_sleep_step(data); } static const struct dev_pm_ops mlx90635_pm_ops = { SYSTEM_SLEEP_PM_OPS(mlx90635_pm_suspend, mlx90635_pm_resume) RUNTIME_PM_OPS(mlx90635_pm_runtime_suspend, NULL, NULL) }; static struct i2c_driver mlx90635_driver = { .driver = { .name = "mlx90635", .of_match_table = mlx90635_of_match, .pm = pm_ptr(&mlx90635_pm_ops), }, .probe = mlx90635_probe, .id_table = mlx90635_id, }; module_i2c_driver(mlx90635_driver); MODULE_AUTHOR("Crt Mori <cmo@melexis.com>"); MODULE_DESCRIPTION("Melexis MLX90635 contactless Infra Red temperature sensor driver"); MODULE_LICENSE("GPL"); |