1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * mlx90632.c - Melexis MLX90632 contactless IR temperature sensor 4 * 5 * Copyright (c) 2017 Melexis <cmo@melexis.com> 6 * 7 * Driver for the Melexis MLX90632 I2C 16-bit IR thermopile sensor 8 */ 9 #include <linux/delay.h> 10 #include <linux/err.h> 11 #include <linux/gpio/consumer.h> 12 #include <linux/i2c.h> 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/math64.h> 16 #include <linux/of.h> 17 #include <linux/pm_runtime.h> 18 #include <linux/regmap.h> 19 20 #include <linux/iio/iio.h> 21 #include <linux/iio/sysfs.h> 22 23 /* Memory sections addresses */ 24 #define MLX90632_ADDR_RAM 0x4000 /* Start address of ram */ 25 #define MLX90632_ADDR_EEPROM 0x2480 /* Start address of user eeprom */ 26 27 /* EEPROM addresses - used at startup */ 28 #define MLX90632_EE_CTRL 0x24d4 /* Control register initial value */ 29 #define MLX90632_EE_I2C_ADDR 0x24d5 /* I2C address register initial value */ 30 #define MLX90632_EE_VERSION 0x240b /* EEPROM version reg address */ 31 #define MLX90632_EE_P_R 0x240c /* P_R calibration register 32bit */ 32 #define MLX90632_EE_P_G 0x240e /* P_G calibration register 32bit */ 33 #define MLX90632_EE_P_T 0x2410 /* P_T calibration register 32bit */ 34 #define MLX90632_EE_P_O 0x2412 /* P_O calibration register 32bit */ 35 #define MLX90632_EE_Aa 0x2414 /* Aa calibration register 32bit */ 36 #define MLX90632_EE_Ab 0x2416 /* Ab calibration register 32bit */ 37 #define MLX90632_EE_Ba 0x2418 /* Ba calibration register 32bit */ 38 #define MLX90632_EE_Bb 0x241a /* Bb calibration register 32bit */ 39 #define MLX90632_EE_Ca 0x241c /* Ca calibration register 32bit */ 40 #define MLX90632_EE_Cb 0x241e /* Cb calibration register 32bit */ 41 #define MLX90632_EE_Da 0x2420 /* Da calibration register 32bit */ 42 #define MLX90632_EE_Db 0x2422 /* Db calibration register 32bit */ 43 #define MLX90632_EE_Ea 0x2424 /* Ea calibration register 32bit */ 44 #define MLX90632_EE_Eb 0x2426 /* Eb calibration register 32bit */ 45 #define MLX90632_EE_Fa 0x2428 /* Fa calibration register 32bit */ 46 #define MLX90632_EE_Fb 0x242a /* Fb calibration register 32bit */ 47 #define MLX90632_EE_Ga 0x242c /* Ga calibration register 32bit */ 48 49 #define MLX90632_EE_Gb 0x242e /* Gb calibration register 16bit */ 50 #define MLX90632_EE_Ka 0x242f /* Ka calibration register 16bit */ 51 52 #define MLX90632_EE_Ha 0x2481 /* Ha customer calib value reg 16bit */ 53 #define MLX90632_EE_Hb 0x2482 /* Hb customer calib value reg 16bit */ 54 55 /* Register addresses - volatile */ 56 #define MLX90632_REG_I2C_ADDR 0x3000 /* Chip I2C address register */ 57 58 /* Control register address - volatile */ 59 #define MLX90632_REG_CONTROL 0x3001 /* Control Register address */ 60 #define MLX90632_CFG_PWR_MASK GENMASK(2, 1) /* PowerMode Mask */ 61 /* PowerModes statuses */ 62 #define MLX90632_PWR_STATUS(ctrl_val) (ctrl_val << 1) 63 #define MLX90632_PWR_STATUS_HALT MLX90632_PWR_STATUS(0) /* hold */ 64 #define MLX90632_PWR_STATUS_SLEEP_STEP MLX90632_PWR_STATUS(1) /* sleep step*/ 65 #define MLX90632_PWR_STATUS_STEP MLX90632_PWR_STATUS(2) /* step */ 66 #define MLX90632_PWR_STATUS_CONTINUOUS MLX90632_PWR_STATUS(3) /* continuous*/ 67 68 /* Device status register - volatile */ 69 #define MLX90632_REG_STATUS 0x3fff /* Device status register */ 70 #define MLX90632_STAT_BUSY BIT(10) /* Device busy indicator */ 71 #define MLX90632_STAT_EE_BUSY BIT(9) /* EEPROM busy indicator */ 72 #define MLX90632_STAT_BRST BIT(8) /* Brown out reset indicator */ 73 #define MLX90632_STAT_CYCLE_POS GENMASK(6, 2) /* Data position */ 74 #define MLX90632_STAT_DATA_RDY BIT(0) /* Data ready indicator */ 75 76 /* RAM_MEAS address-es for each channel */ 77 #define MLX90632_RAM_1(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num) 78 #define MLX90632_RAM_2(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num + 1) 79 #define MLX90632_RAM_3(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num + 2) 80 81 /* Magic constants */ 82 #define MLX90632_ID_MEDICAL 0x0105 /* EEPROM DSPv5 Medical device id */ 83 #define MLX90632_ID_CONSUMER 0x0205 /* EEPROM DSPv5 Consumer device id */ 84 #define MLX90632_DSP_VERSION 5 /* DSP version */ 85 #define MLX90632_DSP_MASK GENMASK(7, 0) /* DSP version in EE_VERSION */ 86 #define MLX90632_RESET_CMD 0x0006 /* Reset sensor (address or global) */ 87 #define MLX90632_REF_12 12LL /**< ResCtrlRef value of Ch 1 or Ch 2 */ 88 #define MLX90632_REF_3 12LL /**< ResCtrlRef value of Channel 3 */ 89 #define MLX90632_MAX_MEAS_NUM 31 /**< Maximum measurements in list */ 90 #define MLX90632_SLEEP_DELAY_MS 3000 /**< Autosleep delay */ 91 92 struct mlx90632_data { 93 struct i2c_client *client; 94 struct mutex lock; /* Multiple reads for single measurement */ 95 struct regmap *regmap; 96 u16 emissivity; 97 }; 98 99 static const struct regmap_range mlx90632_volatile_reg_range[] = { 100 regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL), 101 regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS), 102 regmap_reg_range(MLX90632_RAM_1(0), 103 MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)), 104 }; 105 106 static const struct regmap_access_table mlx90632_volatile_regs_tbl = { 107 .yes_ranges = mlx90632_volatile_reg_range, 108 .n_yes_ranges = ARRAY_SIZE(mlx90632_volatile_reg_range), 109 }; 110 111 static const struct regmap_range mlx90632_read_reg_range[] = { 112 regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka), 113 regmap_reg_range(MLX90632_EE_CTRL, MLX90632_EE_I2C_ADDR), 114 regmap_reg_range(MLX90632_EE_Ha, MLX90632_EE_Hb), 115 regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL), 116 regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS), 117 regmap_reg_range(MLX90632_RAM_1(0), 118 MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)), 119 }; 120 121 static const struct regmap_access_table mlx90632_readable_regs_tbl = { 122 .yes_ranges = mlx90632_read_reg_range, 123 .n_yes_ranges = ARRAY_SIZE(mlx90632_read_reg_range), 124 }; 125 126 static const struct regmap_range mlx90632_no_write_reg_range[] = { 127 regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka), 128 regmap_reg_range(MLX90632_RAM_1(0), 129 MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)), 130 }; 131 132 static const struct regmap_access_table mlx90632_writeable_regs_tbl = { 133 .no_ranges = mlx90632_no_write_reg_range, 134 .n_no_ranges = ARRAY_SIZE(mlx90632_no_write_reg_range), 135 }; 136 137 static const struct regmap_config mlx90632_regmap = { 138 .reg_bits = 16, 139 .val_bits = 16, 140 141 .volatile_table = &mlx90632_volatile_regs_tbl, 142 .rd_table = &mlx90632_readable_regs_tbl, 143 .wr_table = &mlx90632_writeable_regs_tbl, 144 145 .use_single_read = true, 146 .use_single_write = true, 147 .reg_format_endian = REGMAP_ENDIAN_BIG, 148 .val_format_endian = REGMAP_ENDIAN_BIG, 149 .cache_type = REGCACHE_RBTREE, 150 }; 151 152 static s32 mlx90632_pwr_set_sleep_step(struct regmap *regmap) 153 { 154 return regmap_update_bits(regmap, MLX90632_REG_CONTROL, 155 MLX90632_CFG_PWR_MASK, 156 MLX90632_PWR_STATUS_SLEEP_STEP); 157 } 158 159 static s32 mlx90632_pwr_continuous(struct regmap *regmap) 160 { 161 return regmap_update_bits(regmap, MLX90632_REG_CONTROL, 162 MLX90632_CFG_PWR_MASK, 163 MLX90632_PWR_STATUS_CONTINUOUS); 164 } 165 166 /** 167 * mlx90632_perform_measurement - Trigger and retrieve current measurement cycle 168 * @*data: pointer to mlx90632_data object containing regmap information 169 * 170 * Perform a measurement and return latest measurement cycle position reported 171 * by sensor. This is a blocking function for 500ms, as that is default sensor 172 * refresh rate. 173 */ 174 static int mlx90632_perform_measurement(struct mlx90632_data *data) 175 { 176 int ret, tries = 100; 177 unsigned int reg_status; 178 179 ret = regmap_update_bits(data->regmap, MLX90632_REG_STATUS, 180 MLX90632_STAT_DATA_RDY, 0); 181 if (ret < 0) 182 return ret; 183 184 while (tries-- > 0) { 185 ret = regmap_read(data->regmap, MLX90632_REG_STATUS, 186 ®_status); 187 if (ret < 0) 188 return ret; 189 if (reg_status & MLX90632_STAT_DATA_RDY) 190 break; 191 usleep_range(10000, 11000); 192 } 193 194 if (tries < 0) { 195 dev_err(&data->client->dev, "data not ready"); 196 return -ETIMEDOUT; 197 } 198 199 return (reg_status & MLX90632_STAT_CYCLE_POS) >> 2; 200 } 201 202 static int mlx90632_channel_new_select(int perform_ret, uint8_t *channel_new, 203 uint8_t *channel_old) 204 { 205 switch (perform_ret) { 206 case 1: 207 *channel_new = 1; 208 *channel_old = 2; 209 break; 210 case 2: 211 *channel_new = 2; 212 *channel_old = 1; 213 break; 214 default: 215 return -EINVAL; 216 } 217 218 return 0; 219 } 220 221 static int mlx90632_read_ambient_raw(struct regmap *regmap, 222 s16 *ambient_new_raw, s16 *ambient_old_raw) 223 { 224 int ret; 225 unsigned int read_tmp; 226 227 ret = regmap_read(regmap, MLX90632_RAM_3(1), &read_tmp); 228 if (ret < 0) 229 return ret; 230 *ambient_new_raw = (s16)read_tmp; 231 232 ret = regmap_read(regmap, MLX90632_RAM_3(2), &read_tmp); 233 if (ret < 0) 234 return ret; 235 *ambient_old_raw = (s16)read_tmp; 236 237 return ret; 238 } 239 240 static int mlx90632_read_object_raw(struct regmap *regmap, 241 int perform_measurement_ret, 242 s16 *object_new_raw, s16 *object_old_raw) 243 { 244 int ret; 245 unsigned int read_tmp; 246 s16 read; 247 u8 channel = 0; 248 u8 channel_old = 0; 249 250 ret = mlx90632_channel_new_select(perform_measurement_ret, &channel, 251 &channel_old); 252 if (ret != 0) 253 return ret; 254 255 ret = regmap_read(regmap, MLX90632_RAM_2(channel), &read_tmp); 256 if (ret < 0) 257 return ret; 258 259 read = (s16)read_tmp; 260 261 ret = regmap_read(regmap, MLX90632_RAM_1(channel), &read_tmp); 262 if (ret < 0) 263 return ret; 264 *object_new_raw = (read + (s16)read_tmp) / 2; 265 266 ret = regmap_read(regmap, MLX90632_RAM_2(channel_old), &read_tmp); 267 if (ret < 0) 268 return ret; 269 read = (s16)read_tmp; 270 271 ret = regmap_read(regmap, MLX90632_RAM_1(channel_old), &read_tmp); 272 if (ret < 0) 273 return ret; 274 *object_old_raw = (read + (s16)read_tmp) / 2; 275 276 return ret; 277 } 278 279 static int mlx90632_read_all_channel(struct mlx90632_data *data, 280 s16 *ambient_new_raw, s16 *ambient_old_raw, 281 s16 *object_new_raw, s16 *object_old_raw) 282 { 283 s32 ret, measurement; 284 285 mutex_lock(&data->lock); 286 measurement = mlx90632_perform_measurement(data); 287 if (measurement < 0) { 288 ret = measurement; 289 goto read_unlock; 290 } 291 ret = mlx90632_read_ambient_raw(data->regmap, ambient_new_raw, 292 ambient_old_raw); 293 if (ret < 0) 294 goto read_unlock; 295 296 ret = mlx90632_read_object_raw(data->regmap, measurement, 297 object_new_raw, object_old_raw); 298 read_unlock: 299 mutex_unlock(&data->lock); 300 return ret; 301 } 302 303 static int mlx90632_read_ee_register(struct regmap *regmap, u16 reg_lsb, 304 s32 *reg_value) 305 { 306 s32 ret; 307 unsigned int read; 308 u32 value; 309 310 ret = regmap_read(regmap, reg_lsb, &read); 311 if (ret < 0) 312 return ret; 313 314 value = read; 315 316 ret = regmap_read(regmap, reg_lsb + 1, &read); 317 if (ret < 0) 318 return ret; 319 320 *reg_value = (read << 16) | (value & 0xffff); 321 322 return 0; 323 } 324 325 static s64 mlx90632_preprocess_temp_amb(s16 ambient_new_raw, 326 s16 ambient_old_raw, s16 Gb) 327 { 328 s64 VR_Ta, kGb, tmp; 329 330 kGb = ((s64)Gb * 1000LL) >> 10ULL; 331 VR_Ta = (s64)ambient_old_raw * 1000000LL + 332 kGb * div64_s64(((s64)ambient_new_raw * 1000LL), 333 (MLX90632_REF_3)); 334 tmp = div64_s64( 335 div64_s64(((s64)ambient_new_raw * 1000000000000LL), 336 (MLX90632_REF_3)), VR_Ta); 337 return div64_s64(tmp << 19ULL, 1000LL); 338 } 339 340 static s64 mlx90632_preprocess_temp_obj(s16 object_new_raw, s16 object_old_raw, 341 s16 ambient_new_raw, 342 s16 ambient_old_raw, s16 Ka) 343 { 344 s64 VR_IR, kKa, tmp; 345 346 kKa = ((s64)Ka * 1000LL) >> 10ULL; 347 VR_IR = (s64)ambient_old_raw * 1000000LL + 348 kKa * div64_s64(((s64)ambient_new_raw * 1000LL), 349 (MLX90632_REF_3)); 350 tmp = div64_s64( 351 div64_s64(((s64)((object_new_raw + object_old_raw) / 2) 352 * 1000000000000LL), (MLX90632_REF_12)), 353 VR_IR); 354 return div64_s64((tmp << 19ULL), 1000LL); 355 } 356 357 static s32 mlx90632_calc_temp_ambient(s16 ambient_new_raw, s16 ambient_old_raw, 358 s32 P_T, s32 P_R, s32 P_G, s32 P_O, 359 s16 Gb) 360 { 361 s64 Asub, Bsub, Ablock, Bblock, Cblock, AMB, sum; 362 363 AMB = mlx90632_preprocess_temp_amb(ambient_new_raw, ambient_old_raw, 364 Gb); 365 Asub = ((s64)P_T * 10000000000LL) >> 44ULL; 366 Bsub = AMB - (((s64)P_R * 1000LL) >> 8ULL); 367 Ablock = Asub * (Bsub * Bsub); 368 Bblock = (div64_s64(Bsub * 10000000LL, P_G)) << 20ULL; 369 Cblock = ((s64)P_O * 10000000000LL) >> 8ULL; 370 371 sum = div64_s64(Ablock, 1000000LL) + Bblock + Cblock; 372 373 return div64_s64(sum, 10000000LL); 374 } 375 376 static s32 mlx90632_calc_temp_object_iteration(s32 prev_object_temp, s64 object, 377 s64 TAdut, s32 Fa, s32 Fb, 378 s32 Ga, s16 Ha, s16 Hb, 379 u16 emissivity) 380 { 381 s64 calcedKsTO, calcedKsTA, ir_Alpha, TAdut4, Alpha_corr; 382 s64 Ha_customer, Hb_customer; 383 384 Ha_customer = ((s64)Ha * 1000000LL) >> 14ULL; 385 Hb_customer = ((s64)Hb * 100) >> 10ULL; 386 387 calcedKsTO = ((s64)((s64)Ga * (prev_object_temp - 25 * 1000LL) 388 * 1000LL)) >> 36LL; 389 calcedKsTA = ((s64)(Fb * (TAdut - 25 * 1000000LL))) >> 36LL; 390 Alpha_corr = div64_s64((((s64)(Fa * 10000000000LL) >> 46LL) 391 * Ha_customer), 1000LL); 392 Alpha_corr *= ((s64)(1 * 1000000LL + calcedKsTO + calcedKsTA)); 393 Alpha_corr = emissivity * div64_s64(Alpha_corr, 100000LL); 394 Alpha_corr = div64_s64(Alpha_corr, 1000LL); 395 ir_Alpha = div64_s64((s64)object * 10000000LL, Alpha_corr); 396 TAdut4 = (div64_s64(TAdut, 10000LL) + 27315) * 397 (div64_s64(TAdut, 10000LL) + 27315) * 398 (div64_s64(TAdut, 10000LL) + 27315) * 399 (div64_s64(TAdut, 10000LL) + 27315); 400 401 return (int_sqrt64(int_sqrt64(ir_Alpha * 1000000000000LL + TAdut4)) 402 - 27315 - Hb_customer) * 10; 403 } 404 405 static s32 mlx90632_calc_temp_object(s64 object, s64 ambient, s32 Ea, s32 Eb, 406 s32 Fa, s32 Fb, s32 Ga, s16 Ha, s16 Hb, 407 u16 tmp_emi) 408 { 409 s64 kTA, kTA0, TAdut; 410 s64 temp = 25000; 411 s8 i; 412 413 kTA = (Ea * 1000LL) >> 16LL; 414 kTA0 = (Eb * 1000LL) >> 8LL; 415 TAdut = div64_s64(((ambient - kTA0) * 1000000LL), kTA) + 25 * 1000000LL; 416 417 /* Iterations of calculation as described in datasheet */ 418 for (i = 0; i < 5; ++i) { 419 temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut, 420 Fa, Fb, Ga, Ha, Hb, 421 tmp_emi); 422 } 423 return temp; 424 } 425 426 static int mlx90632_calc_object_dsp105(struct mlx90632_data *data, int *val) 427 { 428 s32 ret; 429 s32 Ea, Eb, Fa, Fb, Ga; 430 unsigned int read_tmp; 431 s16 Ha, Hb, Gb, Ka; 432 s16 ambient_new_raw, ambient_old_raw, object_new_raw, object_old_raw; 433 s64 object, ambient; 434 435 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Ea, &Ea); 436 if (ret < 0) 437 return ret; 438 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Eb, &Eb); 439 if (ret < 0) 440 return ret; 441 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Fa, &Fa); 442 if (ret < 0) 443 return ret; 444 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Fb, &Fb); 445 if (ret < 0) 446 return ret; 447 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Ga, &Ga); 448 if (ret < 0) 449 return ret; 450 ret = regmap_read(data->regmap, MLX90632_EE_Ha, &read_tmp); 451 if (ret < 0) 452 return ret; 453 Ha = (s16)read_tmp; 454 ret = regmap_read(data->regmap, MLX90632_EE_Hb, &read_tmp); 455 if (ret < 0) 456 return ret; 457 Hb = (s16)read_tmp; 458 ret = regmap_read(data->regmap, MLX90632_EE_Gb, &read_tmp); 459 if (ret < 0) 460 return ret; 461 Gb = (s16)read_tmp; 462 ret = regmap_read(data->regmap, MLX90632_EE_Ka, &read_tmp); 463 if (ret < 0) 464 return ret; 465 Ka = (s16)read_tmp; 466 467 ret = mlx90632_read_all_channel(data, 468 &ambient_new_raw, &ambient_old_raw, 469 &object_new_raw, &object_old_raw); 470 if (ret < 0) 471 return ret; 472 473 ambient = mlx90632_preprocess_temp_amb(ambient_new_raw, 474 ambient_old_raw, Gb); 475 object = mlx90632_preprocess_temp_obj(object_new_raw, 476 object_old_raw, 477 ambient_new_raw, 478 ambient_old_raw, Ka); 479 480 *val = mlx90632_calc_temp_object(object, ambient, Ea, Eb, Fa, Fb, Ga, 481 Ha, Hb, data->emissivity); 482 return 0; 483 } 484 485 static int mlx90632_calc_ambient_dsp105(struct mlx90632_data *data, int *val) 486 { 487 s32 ret; 488 unsigned int read_tmp; 489 s32 PT, PR, PG, PO; 490 s16 Gb; 491 s16 ambient_new_raw, ambient_old_raw; 492 493 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_R, &PR); 494 if (ret < 0) 495 return ret; 496 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_G, &PG); 497 if (ret < 0) 498 return ret; 499 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_T, &PT); 500 if (ret < 0) 501 return ret; 502 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_O, &PO); 503 if (ret < 0) 504 return ret; 505 ret = regmap_read(data->regmap, MLX90632_EE_Gb, &read_tmp); 506 if (ret < 0) 507 return ret; 508 Gb = (s16)read_tmp; 509 510 ret = mlx90632_read_ambient_raw(data->regmap, &ambient_new_raw, 511 &ambient_old_raw); 512 if (ret < 0) 513 return ret; 514 *val = mlx90632_calc_temp_ambient(ambient_new_raw, ambient_old_raw, 515 PT, PR, PG, PO, Gb); 516 return ret; 517 } 518 519 static int mlx90632_read_raw(struct iio_dev *indio_dev, 520 struct iio_chan_spec const *channel, int *val, 521 int *val2, long mask) 522 { 523 struct mlx90632_data *data = iio_priv(indio_dev); 524 int ret; 525 526 switch (mask) { 527 case IIO_CHAN_INFO_PROCESSED: 528 switch (channel->channel2) { 529 case IIO_MOD_TEMP_AMBIENT: 530 ret = mlx90632_calc_ambient_dsp105(data, val); 531 if (ret < 0) 532 return ret; 533 return IIO_VAL_INT; 534 case IIO_MOD_TEMP_OBJECT: 535 ret = mlx90632_calc_object_dsp105(data, val); 536 if (ret < 0) 537 return ret; 538 return IIO_VAL_INT; 539 default: 540 return -EINVAL; 541 } 542 case IIO_CHAN_INFO_CALIBEMISSIVITY: 543 if (data->emissivity == 1000) { 544 *val = 1; 545 *val2 = 0; 546 } else { 547 *val = 0; 548 *val2 = data->emissivity * 1000; 549 } 550 return IIO_VAL_INT_PLUS_MICRO; 551 552 default: 553 return -EINVAL; 554 } 555 } 556 557 static int mlx90632_write_raw(struct iio_dev *indio_dev, 558 struct iio_chan_spec const *channel, int val, 559 int val2, long mask) 560 { 561 struct mlx90632_data *data = iio_priv(indio_dev); 562 563 switch (mask) { 564 case IIO_CHAN_INFO_CALIBEMISSIVITY: 565 /* Confirm we are within 0 and 1.0 */ 566 if (val < 0 || val2 < 0 || val > 1 || 567 (val == 1 && val2 != 0)) 568 return -EINVAL; 569 data->emissivity = val * 1000 + val2 / 1000; 570 return 0; 571 default: 572 return -EINVAL; 573 } 574 } 575 576 static const struct iio_chan_spec mlx90632_channels[] = { 577 { 578 .type = IIO_TEMP, 579 .modified = 1, 580 .channel2 = IIO_MOD_TEMP_AMBIENT, 581 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), 582 }, 583 { 584 .type = IIO_TEMP, 585 .modified = 1, 586 .channel2 = IIO_MOD_TEMP_OBJECT, 587 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | 588 BIT(IIO_CHAN_INFO_CALIBEMISSIVITY), 589 }, 590 }; 591 592 static const struct iio_info mlx90632_info = { 593 .read_raw = mlx90632_read_raw, 594 .write_raw = mlx90632_write_raw, 595 }; 596 597 static int mlx90632_sleep(struct mlx90632_data *data) 598 { 599 regcache_mark_dirty(data->regmap); 600 601 dev_dbg(&data->client->dev, "Requesting sleep"); 602 return mlx90632_pwr_set_sleep_step(data->regmap); 603 } 604 605 static int mlx90632_wakeup(struct mlx90632_data *data) 606 { 607 int ret; 608 609 ret = regcache_sync(data->regmap); 610 if (ret < 0) { 611 dev_err(&data->client->dev, 612 "Failed to sync regmap registers: %d\n", ret); 613 return ret; 614 } 615 616 dev_dbg(&data->client->dev, "Requesting wake-up\n"); 617 return mlx90632_pwr_continuous(data->regmap); 618 } 619 620 static int mlx90632_probe(struct i2c_client *client, 621 const struct i2c_device_id *id) 622 { 623 struct iio_dev *indio_dev; 624 struct mlx90632_data *mlx90632; 625 struct regmap *regmap; 626 int ret; 627 unsigned int read; 628 629 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*mlx90632)); 630 if (!indio_dev) { 631 dev_err(&client->dev, "Failed to allocate device\n"); 632 return -ENOMEM; 633 } 634 635 regmap = devm_regmap_init_i2c(client, &mlx90632_regmap); 636 if (IS_ERR(regmap)) { 637 ret = PTR_ERR(regmap); 638 dev_err(&client->dev, "Failed to allocate regmap: %d\n", ret); 639 return ret; 640 } 641 642 mlx90632 = iio_priv(indio_dev); 643 i2c_set_clientdata(client, indio_dev); 644 mlx90632->client = client; 645 mlx90632->regmap = regmap; 646 647 mutex_init(&mlx90632->lock); 648 indio_dev->dev.parent = &client->dev; 649 indio_dev->name = id->name; 650 indio_dev->modes = INDIO_DIRECT_MODE; 651 indio_dev->info = &mlx90632_info; 652 indio_dev->channels = mlx90632_channels; 653 indio_dev->num_channels = ARRAY_SIZE(mlx90632_channels); 654 655 ret = mlx90632_wakeup(mlx90632); 656 if (ret < 0) { 657 dev_err(&client->dev, "Wakeup failed: %d\n", ret); 658 return ret; 659 } 660 661 ret = regmap_read(mlx90632->regmap, MLX90632_EE_VERSION, &read); 662 if (ret < 0) { 663 dev_err(&client->dev, "read of version failed: %d\n", ret); 664 return ret; 665 } 666 if (read == MLX90632_ID_MEDICAL) { 667 dev_dbg(&client->dev, 668 "Detected Medical EEPROM calibration %x\n", read); 669 } else if (read == MLX90632_ID_CONSUMER) { 670 dev_dbg(&client->dev, 671 "Detected Consumer EEPROM calibration %x\n", read); 672 } else if ((read & MLX90632_DSP_MASK) == MLX90632_DSP_VERSION) { 673 dev_dbg(&client->dev, 674 "Detected Unknown EEPROM calibration %x\n", read); 675 } else { 676 dev_err(&client->dev, 677 "Wrong DSP version %x (expected %x)\n", 678 read, MLX90632_DSP_VERSION); 679 return -EPROTONOSUPPORT; 680 } 681 682 mlx90632->emissivity = 1000; 683 684 pm_runtime_disable(&client->dev); 685 ret = pm_runtime_set_active(&client->dev); 686 if (ret < 0) { 687 mlx90632_sleep(mlx90632); 688 return ret; 689 } 690 pm_runtime_enable(&client->dev); 691 pm_runtime_set_autosuspend_delay(&client->dev, MLX90632_SLEEP_DELAY_MS); 692 pm_runtime_use_autosuspend(&client->dev); 693 694 return iio_device_register(indio_dev); 695 } 696 697 static int mlx90632_remove(struct i2c_client *client) 698 { 699 struct iio_dev *indio_dev = i2c_get_clientdata(client); 700 struct mlx90632_data *data = iio_priv(indio_dev); 701 702 iio_device_unregister(indio_dev); 703 704 pm_runtime_disable(&client->dev); 705 pm_runtime_set_suspended(&client->dev); 706 pm_runtime_put_noidle(&client->dev); 707 708 mlx90632_sleep(data); 709 710 return 0; 711 } 712 713 static const struct i2c_device_id mlx90632_id[] = { 714 { "mlx90632", 0 }, 715 { } 716 }; 717 MODULE_DEVICE_TABLE(i2c, mlx90632_id); 718 719 static const struct of_device_id mlx90632_of_match[] = { 720 { .compatible = "melexis,mlx90632" }, 721 { } 722 }; 723 MODULE_DEVICE_TABLE(of, mlx90632_of_match); 724 725 static int __maybe_unused mlx90632_pm_suspend(struct device *dev) 726 { 727 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 728 struct mlx90632_data *data = iio_priv(indio_dev); 729 730 return mlx90632_sleep(data); 731 } 732 733 static int __maybe_unused mlx90632_pm_resume(struct device *dev) 734 { 735 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 736 struct mlx90632_data *data = iio_priv(indio_dev); 737 738 return mlx90632_wakeup(data); 739 } 740 741 static UNIVERSAL_DEV_PM_OPS(mlx90632_pm_ops, mlx90632_pm_suspend, 742 mlx90632_pm_resume, NULL); 743 744 static struct i2c_driver mlx90632_driver = { 745 .driver = { 746 .name = "mlx90632", 747 .of_match_table = mlx90632_of_match, 748 .pm = &mlx90632_pm_ops, 749 }, 750 .probe = mlx90632_probe, 751 .remove = mlx90632_remove, 752 .id_table = mlx90632_id, 753 }; 754 module_i2c_driver(mlx90632_driver); 755 756 MODULE_AUTHOR("Crt Mori <cmo@melexis.com>"); 757 MODULE_DESCRIPTION("Melexis MLX90632 contactless Infra Red temperature sensor driver"); 758 MODULE_LICENSE("GPL v2"); 759