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 10 #include <linux/array_size.h> 11 #include <linux/bitfield.h> 12 #include <linux/bits.h> 13 #include <linux/delay.h> 14 #include <linux/dev_printk.h> 15 #include <linux/device.h> 16 #include <linux/err.h> 17 #include <linux/i2c.h> 18 #include <linux/iopoll.h> 19 #include <linux/jiffies.h> 20 #include <linux/limits.h> 21 #include <linux/math64.h> 22 #include <linux/module.h> 23 #include <linux/mutex.h> 24 #include <linux/pm_runtime.h> 25 #include <linux/regmap.h> 26 #include <linux/regulator/consumer.h> 27 #include <linux/types.h> 28 29 #include <linux/iio/iio.h> 30 #include <linux/iio/sysfs.h> 31 32 /* Memory sections addresses */ 33 #define MLX90632_ADDR_RAM 0x4000 /* Start address of ram */ 34 #define MLX90632_ADDR_EEPROM 0x2480 /* Start address of user eeprom */ 35 36 /* EEPROM addresses - used at startup */ 37 #define MLX90632_EE_CTRL 0x24d4 /* Control register initial value */ 38 #define MLX90632_EE_I2C_ADDR 0x24d5 /* I2C address register initial value */ 39 #define MLX90632_EE_VERSION 0x240b /* EEPROM version reg address */ 40 #define MLX90632_EE_P_R 0x240c /* P_R calibration register 32bit */ 41 #define MLX90632_EE_P_G 0x240e /* P_G calibration register 32bit */ 42 #define MLX90632_EE_P_T 0x2410 /* P_T calibration register 32bit */ 43 #define MLX90632_EE_P_O 0x2412 /* P_O calibration register 32bit */ 44 #define MLX90632_EE_Aa 0x2414 /* Aa calibration register 32bit */ 45 #define MLX90632_EE_Ab 0x2416 /* Ab calibration register 32bit */ 46 #define MLX90632_EE_Ba 0x2418 /* Ba calibration register 32bit */ 47 #define MLX90632_EE_Bb 0x241a /* Bb calibration register 32bit */ 48 #define MLX90632_EE_Ca 0x241c /* Ca calibration register 32bit */ 49 #define MLX90632_EE_Cb 0x241e /* Cb calibration register 32bit */ 50 #define MLX90632_EE_Da 0x2420 /* Da calibration register 32bit */ 51 #define MLX90632_EE_Db 0x2422 /* Db calibration register 32bit */ 52 #define MLX90632_EE_Ea 0x2424 /* Ea calibration register 32bit */ 53 #define MLX90632_EE_Eb 0x2426 /* Eb calibration register 32bit */ 54 #define MLX90632_EE_Fa 0x2428 /* Fa calibration register 32bit */ 55 #define MLX90632_EE_Fb 0x242a /* Fb calibration register 32bit */ 56 #define MLX90632_EE_Ga 0x242c /* Ga calibration register 32bit */ 57 58 #define MLX90632_EE_Gb 0x242e /* Gb calibration register 16bit */ 59 #define MLX90632_EE_Ka 0x242f /* Ka calibration register 16bit */ 60 61 #define MLX90632_EE_Ha 0x2481 /* Ha customer calib value reg 16bit */ 62 #define MLX90632_EE_Hb 0x2482 /* Hb customer calib value reg 16bit */ 63 64 #define MLX90632_EE_MEDICAL_MEAS1 0x24E1 /* Medical measurement 1 16bit */ 65 #define MLX90632_EE_MEDICAL_MEAS2 0x24E2 /* Medical measurement 2 16bit */ 66 #define MLX90632_EE_EXTENDED_MEAS1 0x24F1 /* Extended measurement 1 16bit */ 67 #define MLX90632_EE_EXTENDED_MEAS2 0x24F2 /* Extended measurement 2 16bit */ 68 #define MLX90632_EE_EXTENDED_MEAS3 0x24F3 /* Extended measurement 3 16bit */ 69 70 /* Register addresses - volatile */ 71 #define MLX90632_REG_I2C_ADDR 0x3000 /* Chip I2C address register */ 72 73 /* Control register address - volatile */ 74 #define MLX90632_REG_CONTROL 0x3001 /* Control Register address */ 75 #define MLX90632_CFG_PWR_MASK GENMASK(2, 1) /* PowerMode Mask */ 76 #define MLX90632_CFG_MTYP_MASK GENMASK(8, 4) /* Meas select Mask */ 77 #define MLX90632_CFG_SOB_MASK BIT(11) 78 79 /* PowerModes statuses */ 80 #define MLX90632_PWR_STATUS(ctrl_val) (ctrl_val << 1) 81 #define MLX90632_PWR_STATUS_HALT MLX90632_PWR_STATUS(0) /* hold */ 82 #define MLX90632_PWR_STATUS_SLEEP_STEP MLX90632_PWR_STATUS(1) /* sleep step */ 83 #define MLX90632_PWR_STATUS_STEP MLX90632_PWR_STATUS(2) /* step */ 84 #define MLX90632_PWR_STATUS_CONTINUOUS MLX90632_PWR_STATUS(3) /* continuous */ 85 86 #define MLX90632_EE_RR GENMASK(10, 8) /* Only Refresh Rate bits */ 87 #define MLX90632_REFRESH_RATE(ee_val) FIELD_GET(MLX90632_EE_RR, ee_val) 88 /* Extract Refresh Rate from ee register */ 89 #define MLX90632_REFRESH_RATE_STATUS(refresh_rate) (refresh_rate << 8) 90 91 /* Measurement types */ 92 #define MLX90632_MTYP_MEDICAL 0 93 #define MLX90632_MTYP_EXTENDED 17 94 95 /* Measurement type select*/ 96 #define MLX90632_MTYP_STATUS(ctrl_val) (ctrl_val << 4) 97 #define MLX90632_MTYP_STATUS_MEDICAL MLX90632_MTYP_STATUS(MLX90632_MTYP_MEDICAL) 98 #define MLX90632_MTYP_STATUS_EXTENDED MLX90632_MTYP_STATUS(MLX90632_MTYP_EXTENDED) 99 100 /* I2C command register - volatile */ 101 #define MLX90632_REG_I2C_CMD 0x3005 /* I2C command Register address */ 102 103 /* Device status register - volatile */ 104 #define MLX90632_REG_STATUS 0x3fff /* Device status register */ 105 #define MLX90632_STAT_BUSY BIT(10) /* Device busy indicator */ 106 #define MLX90632_STAT_EE_BUSY BIT(9) /* EEPROM busy indicator */ 107 #define MLX90632_STAT_BRST BIT(8) /* Brown out reset indicator */ 108 #define MLX90632_STAT_CYCLE_POS GENMASK(6, 2) /* Data position */ 109 #define MLX90632_STAT_DATA_RDY BIT(0) /* Data ready indicator */ 110 111 /* RAM_MEAS address-es for each channel */ 112 #define MLX90632_RAM_1(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num) 113 #define MLX90632_RAM_2(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num + 1) 114 #define MLX90632_RAM_3(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num + 2) 115 116 /* Name important RAM_MEAS channels */ 117 #define MLX90632_RAM_DSP5_EXTENDED_AMBIENT_1 MLX90632_RAM_3(17) 118 #define MLX90632_RAM_DSP5_EXTENDED_AMBIENT_2 MLX90632_RAM_3(18) 119 #define MLX90632_RAM_DSP5_EXTENDED_OBJECT_1 MLX90632_RAM_1(17) 120 #define MLX90632_RAM_DSP5_EXTENDED_OBJECT_2 MLX90632_RAM_2(17) 121 #define MLX90632_RAM_DSP5_EXTENDED_OBJECT_3 MLX90632_RAM_1(18) 122 #define MLX90632_RAM_DSP5_EXTENDED_OBJECT_4 MLX90632_RAM_2(18) 123 #define MLX90632_RAM_DSP5_EXTENDED_OBJECT_5 MLX90632_RAM_1(19) 124 #define MLX90632_RAM_DSP5_EXTENDED_OBJECT_6 MLX90632_RAM_2(19) 125 126 /* Magic constants */ 127 #define MLX90632_ID_MEDICAL 0x0105 /* EEPROM DSPv5 Medical device id */ 128 #define MLX90632_ID_CONSUMER 0x0205 /* EEPROM DSPv5 Consumer device id */ 129 #define MLX90632_ID_EXTENDED 0x0505 /* EEPROM DSPv5 Extended range device id */ 130 #define MLX90632_ID_MASK GENMASK(14, 0) /* DSP version and device ID in EE_VERSION */ 131 #define MLX90632_DSP_VERSION 5 /* DSP version */ 132 #define MLX90632_DSP_MASK GENMASK(7, 0) /* DSP version in EE_VERSION */ 133 #define MLX90632_RESET_CMD 0x0006 /* Reset sensor (address or global) */ 134 #define MLX90632_REF_12 12LL /* ResCtrlRef value of Ch 1 or Ch 2 */ 135 #define MLX90632_REF_3 12LL /* ResCtrlRef value of Channel 3 */ 136 #define MLX90632_MAX_MEAS_NUM 31 /* Maximum measurements in list */ 137 #define MLX90632_SLEEP_DELAY_MS 6000 /* Autosleep delay */ 138 #define MLX90632_EXTENDED_LIMIT 27000 /* Extended mode raw value limit */ 139 #define MLX90632_MEAS_MAX_TIME 2000 /* Max measurement time in ms for the lowest refresh rate */ 140 141 /** 142 * struct mlx90632_data - private data for the MLX90632 device 143 * @client: I2C client of the device 144 * @lock: Internal mutex for multiple reads for single measurement 145 * @regmap: Regmap of the device 146 * @emissivity: Object emissivity from 0 to 1000 where 1000 = 1. 147 * @mtyp: Measurement type physical sensor configuration for extended range 148 * calculations 149 * @object_ambient_temperature: Ambient temperature at object (might differ of 150 * the ambient temperature of sensor. 151 * @regulator: Regulator of the device 152 * @powerstatus: Current POWER status of the device 153 * @interaction_ts: Timestamp of the last temperature read that is used 154 * for power management in jiffies 155 */ 156 struct mlx90632_data { 157 struct i2c_client *client; 158 struct mutex lock; 159 struct regmap *regmap; 160 u16 emissivity; 161 u8 mtyp; 162 u32 object_ambient_temperature; 163 struct regulator *regulator; 164 int powerstatus; 165 unsigned long interaction_ts; 166 }; 167 168 static const struct regmap_range mlx90632_volatile_reg_range[] = { 169 regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL), 170 regmap_reg_range(MLX90632_REG_I2C_CMD, MLX90632_REG_I2C_CMD), 171 regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS), 172 regmap_reg_range(MLX90632_RAM_1(0), 173 MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)), 174 }; 175 176 static const struct regmap_access_table mlx90632_volatile_regs_tbl = { 177 .yes_ranges = mlx90632_volatile_reg_range, 178 .n_yes_ranges = ARRAY_SIZE(mlx90632_volatile_reg_range), 179 }; 180 181 static const struct regmap_range mlx90632_read_reg_range[] = { 182 regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka), 183 regmap_reg_range(MLX90632_EE_CTRL, MLX90632_EE_I2C_ADDR), 184 regmap_reg_range(MLX90632_EE_Ha, MLX90632_EE_Hb), 185 regmap_reg_range(MLX90632_EE_MEDICAL_MEAS1, MLX90632_EE_MEDICAL_MEAS2), 186 regmap_reg_range(MLX90632_EE_EXTENDED_MEAS1, MLX90632_EE_EXTENDED_MEAS3), 187 regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL), 188 regmap_reg_range(MLX90632_REG_I2C_CMD, MLX90632_REG_I2C_CMD), 189 regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS), 190 regmap_reg_range(MLX90632_RAM_1(0), 191 MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)), 192 }; 193 194 static const struct regmap_access_table mlx90632_readable_regs_tbl = { 195 .yes_ranges = mlx90632_read_reg_range, 196 .n_yes_ranges = ARRAY_SIZE(mlx90632_read_reg_range), 197 }; 198 199 static const struct regmap_range mlx90632_no_write_reg_range[] = { 200 regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka), 201 regmap_reg_range(MLX90632_RAM_1(0), 202 MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)), 203 }; 204 205 static const struct regmap_access_table mlx90632_writeable_regs_tbl = { 206 .no_ranges = mlx90632_no_write_reg_range, 207 .n_no_ranges = ARRAY_SIZE(mlx90632_no_write_reg_range), 208 }; 209 210 static const struct regmap_config mlx90632_regmap = { 211 .reg_bits = 16, 212 .val_bits = 16, 213 214 .volatile_table = &mlx90632_volatile_regs_tbl, 215 .rd_table = &mlx90632_readable_regs_tbl, 216 .wr_table = &mlx90632_writeable_regs_tbl, 217 218 .use_single_read = true, 219 .use_single_write = true, 220 .reg_format_endian = REGMAP_ENDIAN_BIG, 221 .val_format_endian = REGMAP_ENDIAN_BIG, 222 .cache_type = REGCACHE_RBTREE, 223 }; 224 225 static int mlx90632_pwr_set_sleep_step(struct regmap *regmap) 226 { 227 struct mlx90632_data *data = 228 iio_priv(dev_get_drvdata(regmap_get_device(regmap))); 229 int ret; 230 231 if (data->powerstatus == MLX90632_PWR_STATUS_SLEEP_STEP) 232 return 0; 233 234 ret = regmap_write_bits(regmap, MLX90632_REG_CONTROL, MLX90632_CFG_PWR_MASK, 235 MLX90632_PWR_STATUS_SLEEP_STEP); 236 if (ret < 0) 237 return ret; 238 239 data->powerstatus = MLX90632_PWR_STATUS_SLEEP_STEP; 240 return 0; 241 } 242 243 static int mlx90632_pwr_continuous(struct regmap *regmap) 244 { 245 struct mlx90632_data *data = 246 iio_priv(dev_get_drvdata(regmap_get_device(regmap))); 247 int ret; 248 249 if (data->powerstatus == MLX90632_PWR_STATUS_CONTINUOUS) 250 return 0; 251 252 ret = regmap_write_bits(regmap, MLX90632_REG_CONTROL, MLX90632_CFG_PWR_MASK, 253 MLX90632_PWR_STATUS_CONTINUOUS); 254 if (ret < 0) 255 return ret; 256 257 data->powerstatus = MLX90632_PWR_STATUS_CONTINUOUS; 258 return 0; 259 } 260 261 /** 262 * mlx90632_reset_delay() - Give the mlx90632 some time to reset properly 263 * If this is not done, the following I2C command(s) will not be accepted. 264 */ 265 static void mlx90632_reset_delay(void) 266 { 267 usleep_range(150, 200); 268 } 269 270 static int mlx90632_get_measurement_time(struct regmap *regmap, u16 meas) 271 { 272 unsigned int reg; 273 int ret; 274 275 ret = regmap_read(regmap, meas, ®); 276 if (ret < 0) 277 return ret; 278 279 return MLX90632_MEAS_MAX_TIME >> FIELD_GET(MLX90632_EE_RR, reg); 280 } 281 282 static int mlx90632_calculate_dataset_ready_time(struct mlx90632_data *data) 283 { 284 unsigned int refresh_time; 285 int ret; 286 287 if (data->mtyp == MLX90632_MTYP_MEDICAL) { 288 ret = mlx90632_get_measurement_time(data->regmap, 289 MLX90632_EE_MEDICAL_MEAS1); 290 if (ret < 0) 291 return ret; 292 293 refresh_time = ret; 294 295 ret = mlx90632_get_measurement_time(data->regmap, 296 MLX90632_EE_MEDICAL_MEAS2); 297 if (ret < 0) 298 return ret; 299 300 refresh_time += ret; 301 } else { 302 ret = mlx90632_get_measurement_time(data->regmap, 303 MLX90632_EE_EXTENDED_MEAS1); 304 if (ret < 0) 305 return ret; 306 307 refresh_time = ret; 308 309 ret = mlx90632_get_measurement_time(data->regmap, 310 MLX90632_EE_EXTENDED_MEAS2); 311 if (ret < 0) 312 return ret; 313 314 refresh_time += ret; 315 316 ret = mlx90632_get_measurement_time(data->regmap, 317 MLX90632_EE_EXTENDED_MEAS3); 318 if (ret < 0) 319 return ret; 320 321 refresh_time += ret; 322 } 323 324 return refresh_time; 325 } 326 327 /** 328 * mlx90632_perform_measurement() - Trigger and retrieve current measurement cycle 329 * @data: pointer to mlx90632_data object containing regmap information 330 * 331 * Perform a measurement and return latest measurement cycle position reported 332 * by sensor. This is a blocking function for 500ms, as that is default sensor 333 * refresh rate. 334 */ 335 static int mlx90632_perform_measurement(struct mlx90632_data *data) 336 { 337 unsigned int reg_status; 338 int ret; 339 340 ret = regmap_clear_bits(data->regmap, MLX90632_REG_STATUS, 341 MLX90632_STAT_DATA_RDY); 342 if (ret < 0) 343 return ret; 344 345 ret = regmap_read_poll_timeout(data->regmap, MLX90632_REG_STATUS, reg_status, 346 !(reg_status & MLX90632_STAT_DATA_RDY), 10000, 347 100 * 10000); 348 349 if (ret < 0) { 350 dev_err(&data->client->dev, "data not ready"); 351 return -ETIMEDOUT; 352 } 353 354 return (reg_status & MLX90632_STAT_CYCLE_POS) >> 2; 355 } 356 357 /** 358 * mlx90632_perform_measurement_burst() - Trigger and retrieve current measurement 359 * cycle in step sleep mode 360 * @data: pointer to mlx90632_data object containing regmap information 361 * 362 * Perform a measurement and return 2 as measurement cycle position reported 363 * by sensor. This is a blocking function for amount dependent on the sensor 364 * refresh rate. 365 */ 366 static int mlx90632_perform_measurement_burst(struct mlx90632_data *data) 367 { 368 unsigned int reg_status; 369 int ret; 370 371 ret = regmap_write_bits(data->regmap, MLX90632_REG_CONTROL, 372 MLX90632_CFG_SOB_MASK, MLX90632_CFG_SOB_MASK); 373 if (ret < 0) 374 return ret; 375 376 ret = mlx90632_calculate_dataset_ready_time(data); 377 if (ret < 0) 378 return ret; 379 380 msleep(ret); /* Wait minimum time for dataset to be ready */ 381 382 ret = regmap_read_poll_timeout(data->regmap, MLX90632_REG_STATUS, 383 reg_status, 384 (reg_status & MLX90632_STAT_BUSY) == 0, 385 10000, 100 * 10000); 386 if (ret < 0) { 387 dev_err(&data->client->dev, "data not ready"); 388 return -ETIMEDOUT; 389 } 390 391 return 2; 392 } 393 394 static int mlx90632_set_meas_type(struct mlx90632_data *data, u8 type) 395 { 396 int current_powerstatus; 397 int ret; 398 399 if (data->mtyp == type) 400 return 0; 401 402 current_powerstatus = data->powerstatus; 403 ret = mlx90632_pwr_continuous(data->regmap); 404 if (ret < 0) 405 return ret; 406 407 ret = regmap_write(data->regmap, MLX90632_REG_I2C_CMD, MLX90632_RESET_CMD); 408 if (ret < 0) 409 return ret; 410 411 mlx90632_reset_delay(); 412 413 ret = regmap_update_bits(data->regmap, MLX90632_REG_CONTROL, 414 (MLX90632_CFG_MTYP_MASK | MLX90632_CFG_PWR_MASK), 415 (MLX90632_MTYP_STATUS(type) | MLX90632_PWR_STATUS_HALT)); 416 if (ret < 0) 417 return ret; 418 419 data->mtyp = type; 420 data->powerstatus = MLX90632_PWR_STATUS_HALT; 421 422 if (current_powerstatus == MLX90632_PWR_STATUS_SLEEP_STEP) 423 return mlx90632_pwr_set_sleep_step(data->regmap); 424 425 return mlx90632_pwr_continuous(data->regmap); 426 } 427 428 static int mlx90632_channel_new_select(int perform_ret, uint8_t *channel_new, 429 uint8_t *channel_old) 430 { 431 switch (perform_ret) { 432 case 1: 433 *channel_new = 1; 434 *channel_old = 2; 435 break; 436 case 2: 437 *channel_new = 2; 438 *channel_old = 1; 439 break; 440 default: 441 return -ECHRNG; 442 } 443 444 return 0; 445 } 446 447 static int mlx90632_read_ambient_raw(struct regmap *regmap, 448 s16 *ambient_new_raw, s16 *ambient_old_raw) 449 { 450 unsigned int read_tmp; 451 int ret; 452 453 ret = regmap_read(regmap, MLX90632_RAM_3(1), &read_tmp); 454 if (ret < 0) 455 return ret; 456 *ambient_new_raw = (s16)read_tmp; 457 458 ret = regmap_read(regmap, MLX90632_RAM_3(2), &read_tmp); 459 if (ret < 0) 460 return ret; 461 *ambient_old_raw = (s16)read_tmp; 462 463 return ret; 464 } 465 466 static int mlx90632_read_object_raw(struct regmap *regmap, 467 int perform_measurement_ret, 468 s16 *object_new_raw, s16 *object_old_raw) 469 { 470 unsigned int read_tmp; 471 u8 channel_old = 0; 472 u8 channel = 0; 473 s16 read; 474 int ret; 475 476 ret = mlx90632_channel_new_select(perform_measurement_ret, &channel, 477 &channel_old); 478 if (ret != 0) 479 return ret; 480 481 ret = regmap_read(regmap, MLX90632_RAM_2(channel), &read_tmp); 482 if (ret < 0) 483 return ret; 484 485 read = (s16)read_tmp; 486 487 ret = regmap_read(regmap, MLX90632_RAM_1(channel), &read_tmp); 488 if (ret < 0) 489 return ret; 490 *object_new_raw = (read + (s16)read_tmp) / 2; 491 492 ret = regmap_read(regmap, MLX90632_RAM_2(channel_old), &read_tmp); 493 if (ret < 0) 494 return ret; 495 read = (s16)read_tmp; 496 497 ret = regmap_read(regmap, MLX90632_RAM_1(channel_old), &read_tmp); 498 if (ret < 0) 499 return ret; 500 *object_old_raw = (read + (s16)read_tmp) / 2; 501 502 return ret; 503 } 504 505 static int mlx90632_read_all_channel(struct mlx90632_data *data, 506 s16 *ambient_new_raw, s16 *ambient_old_raw, 507 s16 *object_new_raw, s16 *object_old_raw) 508 { 509 s32 measurement; 510 int ret; 511 512 mutex_lock(&data->lock); 513 ret = mlx90632_set_meas_type(data, MLX90632_MTYP_MEDICAL); 514 if (ret < 0) 515 goto read_unlock; 516 517 switch (data->powerstatus) { 518 case MLX90632_PWR_STATUS_CONTINUOUS: 519 ret = mlx90632_perform_measurement(data); 520 if (ret < 0) 521 goto read_unlock; 522 523 break; 524 case MLX90632_PWR_STATUS_SLEEP_STEP: 525 ret = mlx90632_perform_measurement_burst(data); 526 if (ret < 0) 527 goto read_unlock; 528 529 break; 530 default: 531 ret = -EOPNOTSUPP; 532 goto read_unlock; 533 } 534 535 measurement = ret; /* If we came here ret holds the measurement position */ 536 537 ret = mlx90632_read_ambient_raw(data->regmap, ambient_new_raw, 538 ambient_old_raw); 539 if (ret < 0) 540 goto read_unlock; 541 542 ret = mlx90632_read_object_raw(data->regmap, measurement, 543 object_new_raw, object_old_raw); 544 read_unlock: 545 mutex_unlock(&data->lock); 546 return ret; 547 } 548 549 static int mlx90632_read_ambient_raw_extended(struct regmap *regmap, 550 s16 *ambient_new_raw, s16 *ambient_old_raw) 551 { 552 unsigned int read_tmp; 553 int ret; 554 555 ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_AMBIENT_1, &read_tmp); 556 if (ret < 0) 557 return ret; 558 *ambient_new_raw = (s16)read_tmp; 559 560 ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_AMBIENT_2, &read_tmp); 561 if (ret < 0) 562 return ret; 563 *ambient_old_raw = (s16)read_tmp; 564 565 return 0; 566 } 567 568 static int mlx90632_read_object_raw_extended(struct regmap *regmap, s16 *object_new_raw) 569 { 570 unsigned int read_tmp; 571 s32 read; 572 int ret; 573 574 ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_1, &read_tmp); 575 if (ret < 0) 576 return ret; 577 read = (s16)read_tmp; 578 579 ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_2, &read_tmp); 580 if (ret < 0) 581 return ret; 582 read = read - (s16)read_tmp; 583 584 ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_3, &read_tmp); 585 if (ret < 0) 586 return ret; 587 read = read - (s16)read_tmp; 588 589 ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_4, &read_tmp); 590 if (ret < 0) 591 return ret; 592 read = (read + (s16)read_tmp) / 2; 593 594 ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_5, &read_tmp); 595 if (ret < 0) 596 return ret; 597 read = read + (s16)read_tmp; 598 599 ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_6, &read_tmp); 600 if (ret < 0) 601 return ret; 602 read = read + (s16)read_tmp; 603 604 if (read > S16_MAX || read < S16_MIN) 605 return -ERANGE; 606 607 *object_new_raw = read; 608 609 return 0; 610 } 611 612 static int mlx90632_read_all_channel_extended(struct mlx90632_data *data, s16 *object_new_raw, 613 s16 *ambient_new_raw, s16 *ambient_old_raw) 614 { 615 s32 ret, meas; 616 617 mutex_lock(&data->lock); 618 ret = mlx90632_set_meas_type(data, MLX90632_MTYP_EXTENDED); 619 if (ret < 0) 620 goto read_unlock; 621 622 switch (data->powerstatus) { 623 case MLX90632_PWR_STATUS_CONTINUOUS: 624 ret = read_poll_timeout(mlx90632_perform_measurement, meas, meas == 19, 625 50000, 800000, false, data); 626 if (ret) 627 goto read_unlock; 628 break; 629 case MLX90632_PWR_STATUS_SLEEP_STEP: 630 ret = mlx90632_perform_measurement_burst(data); 631 if (ret < 0) 632 goto read_unlock; 633 break; 634 default: 635 ret = -EOPNOTSUPP; 636 goto read_unlock; 637 } 638 639 ret = mlx90632_read_object_raw_extended(data->regmap, object_new_raw); 640 if (ret < 0) 641 goto read_unlock; 642 643 ret = mlx90632_read_ambient_raw_extended(data->regmap, ambient_new_raw, ambient_old_raw); 644 645 read_unlock: 646 mutex_unlock(&data->lock); 647 return ret; 648 } 649 650 static int mlx90632_read_ee_register(struct regmap *regmap, u16 reg_lsb, 651 s32 *reg_value) 652 { 653 unsigned int read; 654 u32 value; 655 int ret; 656 657 ret = regmap_read(regmap, reg_lsb, &read); 658 if (ret < 0) 659 return ret; 660 661 value = read; 662 663 ret = regmap_read(regmap, reg_lsb + 1, &read); 664 if (ret < 0) 665 return ret; 666 667 *reg_value = (read << 16) | (value & 0xffff); 668 669 return 0; 670 } 671 672 static s64 mlx90632_preprocess_temp_amb(s16 ambient_new_raw, 673 s16 ambient_old_raw, s16 Gb) 674 { 675 s64 VR_Ta, kGb, tmp; 676 677 kGb = ((s64)Gb * 1000LL) >> 10ULL; 678 VR_Ta = (s64)ambient_old_raw * 1000000LL + 679 kGb * div64_s64(((s64)ambient_new_raw * 1000LL), 680 (MLX90632_REF_3)); 681 tmp = div64_s64( 682 div64_s64(((s64)ambient_new_raw * 1000000000000LL), 683 (MLX90632_REF_3)), VR_Ta); 684 return div64_s64(tmp << 19ULL, 1000LL); 685 } 686 687 static s64 mlx90632_preprocess_temp_obj(s16 object_new_raw, s16 object_old_raw, 688 s16 ambient_new_raw, 689 s16 ambient_old_raw, s16 Ka) 690 { 691 s64 VR_IR, kKa, tmp; 692 693 kKa = ((s64)Ka * 1000LL) >> 10ULL; 694 VR_IR = (s64)ambient_old_raw * 1000000LL + 695 kKa * div64_s64(((s64)ambient_new_raw * 1000LL), 696 (MLX90632_REF_3)); 697 tmp = div64_s64( 698 div64_s64(((s64)((object_new_raw + object_old_raw) / 2) 699 * 1000000000000LL), (MLX90632_REF_12)), 700 VR_IR); 701 return div64_s64((tmp << 19ULL), 1000LL); 702 } 703 704 static s64 mlx90632_preprocess_temp_obj_extended(s16 object_new_raw, s16 ambient_new_raw, 705 s16 ambient_old_raw, s16 Ka) 706 { 707 s64 VR_IR, kKa, tmp; 708 709 kKa = ((s64)Ka * 1000LL) >> 10ULL; 710 VR_IR = (s64)ambient_old_raw * 1000000LL + 711 kKa * div64_s64((s64)ambient_new_raw * 1000LL, 712 MLX90632_REF_3); 713 tmp = div64_s64( 714 div64_s64((s64) object_new_raw * 1000000000000LL, MLX90632_REF_12), 715 VR_IR); 716 return div64_s64(tmp << 19ULL, 1000LL); 717 } 718 719 static s32 mlx90632_calc_temp_ambient(s16 ambient_new_raw, s16 ambient_old_raw, 720 s32 P_T, s32 P_R, s32 P_G, s32 P_O, s16 Gb) 721 { 722 s64 Asub, Bsub, Ablock, Bblock, Cblock, AMB, sum; 723 724 AMB = mlx90632_preprocess_temp_amb(ambient_new_raw, ambient_old_raw, 725 Gb); 726 Asub = ((s64)P_T * 10000000000LL) >> 44ULL; 727 Bsub = AMB - (((s64)P_R * 1000LL) >> 8ULL); 728 Ablock = Asub * (Bsub * Bsub); 729 Bblock = (div64_s64(Bsub * 10000000LL, P_G)) << 20ULL; 730 Cblock = ((s64)P_O * 10000000000LL) >> 8ULL; 731 732 sum = div64_s64(Ablock, 1000000LL) + Bblock + Cblock; 733 734 return div64_s64(sum, 10000000LL); 735 } 736 737 static s32 mlx90632_calc_temp_object_iteration(s32 prev_object_temp, s64 object, 738 s64 TAdut, s64 TAdut4, s32 Fa, s32 Fb, 739 s32 Ga, s16 Ha, s16 Hb, 740 u16 emissivity) 741 { 742 s64 calcedKsTO, calcedKsTA, ir_Alpha, Alpha_corr; 743 s64 Ha_customer, Hb_customer; 744 745 Ha_customer = ((s64)Ha * 1000000LL) >> 14ULL; 746 Hb_customer = ((s64)Hb * 100) >> 10ULL; 747 748 calcedKsTO = ((s64)((s64)Ga * (prev_object_temp - 25 * 1000LL) 749 * 1000LL)) >> 36LL; 750 calcedKsTA = ((s64)(Fb * (TAdut - 25 * 1000000LL))) >> 36LL; 751 Alpha_corr = div64_s64((((s64)(Fa * 10000000000LL) >> 46LL) 752 * Ha_customer), 1000LL); 753 Alpha_corr *= ((s64)(1 * 1000000LL + calcedKsTO + calcedKsTA)); 754 Alpha_corr = emissivity * div64_s64(Alpha_corr, 100000LL); 755 Alpha_corr = div64_s64(Alpha_corr, 1000LL); 756 ir_Alpha = div64_s64((s64)object * 10000000LL, Alpha_corr); 757 758 return (int_sqrt64(int_sqrt64(ir_Alpha * 1000000000000LL + TAdut4)) 759 - 27315 - Hb_customer) * 10; 760 } 761 762 static s64 mlx90632_calc_ta4(s64 TAdut, s64 scale) 763 { 764 return (div64_s64(TAdut, scale) + 27315) * 765 (div64_s64(TAdut, scale) + 27315) * 766 (div64_s64(TAdut, scale) + 27315) * 767 (div64_s64(TAdut, scale) + 27315); 768 } 769 770 static s32 mlx90632_calc_temp_object(s64 object, s64 ambient, s32 Ea, s32 Eb, 771 s32 Fa, s32 Fb, s32 Ga, s16 Ha, s16 Hb, 772 u16 tmp_emi) 773 { 774 s64 kTA, kTA0, TAdut, TAdut4; 775 s64 temp = 25000; 776 s8 i; 777 778 kTA = (Ea * 1000LL) >> 16LL; 779 kTA0 = (Eb * 1000LL) >> 8LL; 780 TAdut = div64_s64(((ambient - kTA0) * 1000000LL), kTA) + 25 * 1000000LL; 781 TAdut4 = mlx90632_calc_ta4(TAdut, 10000LL); 782 783 /* Iterations of calculation as described in datasheet */ 784 for (i = 0; i < 5; ++i) { 785 temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut, TAdut4, 786 Fa, Fb, Ga, Ha, Hb, 787 tmp_emi); 788 } 789 return temp; 790 } 791 792 static s32 mlx90632_calc_temp_object_extended(s64 object, s64 ambient, s64 reflected, 793 s32 Ea, s32 Eb, s32 Fa, s32 Fb, s32 Ga, 794 s16 Ha, s16 Hb, u16 tmp_emi) 795 { 796 s64 kTA, kTA0, TAdut, TAdut4, Tr4, TaTr4; 797 s64 temp = 25000; 798 s8 i; 799 800 kTA = (Ea * 1000LL) >> 16LL; 801 kTA0 = (Eb * 1000LL) >> 8LL; 802 TAdut = div64_s64((ambient - kTA0) * 1000000LL, kTA) + 25 * 1000000LL; 803 Tr4 = mlx90632_calc_ta4(reflected, 10); 804 TAdut4 = mlx90632_calc_ta4(TAdut, 10000LL); 805 TaTr4 = Tr4 - div64_s64(Tr4 - TAdut4, tmp_emi) * 1000; 806 807 /* Iterations of calculation as described in datasheet */ 808 for (i = 0; i < 5; ++i) { 809 temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut, TaTr4, 810 Fa / 2, Fb, Ga, Ha, Hb, 811 tmp_emi); 812 } 813 814 return temp; 815 } 816 817 static int mlx90632_calc_object_dsp105(struct mlx90632_data *data, int *val) 818 { 819 s16 ambient_new_raw, ambient_old_raw, object_new_raw, object_old_raw; 820 s32 Ea, Eb, Fa, Fb, Ga; 821 unsigned int read_tmp; 822 s64 object, ambient; 823 s16 Ha, Hb, Gb, Ka; 824 int ret; 825 826 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Ea, &Ea); 827 if (ret < 0) 828 return ret; 829 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Eb, &Eb); 830 if (ret < 0) 831 return ret; 832 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Fa, &Fa); 833 if (ret < 0) 834 return ret; 835 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Fb, &Fb); 836 if (ret < 0) 837 return ret; 838 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Ga, &Ga); 839 if (ret < 0) 840 return ret; 841 ret = regmap_read(data->regmap, MLX90632_EE_Ha, &read_tmp); 842 if (ret < 0) 843 return ret; 844 Ha = (s16)read_tmp; 845 ret = regmap_read(data->regmap, MLX90632_EE_Hb, &read_tmp); 846 if (ret < 0) 847 return ret; 848 Hb = (s16)read_tmp; 849 ret = regmap_read(data->regmap, MLX90632_EE_Gb, &read_tmp); 850 if (ret < 0) 851 return ret; 852 Gb = (s16)read_tmp; 853 ret = regmap_read(data->regmap, MLX90632_EE_Ka, &read_tmp); 854 if (ret < 0) 855 return ret; 856 Ka = (s16)read_tmp; 857 858 ret = mlx90632_read_all_channel(data, 859 &ambient_new_raw, &ambient_old_raw, 860 &object_new_raw, &object_old_raw); 861 if (ret < 0) 862 return ret; 863 864 if (object_new_raw > MLX90632_EXTENDED_LIMIT && 865 data->mtyp == MLX90632_MTYP_EXTENDED) { 866 ret = mlx90632_read_all_channel_extended(data, &object_new_raw, 867 &ambient_new_raw, &ambient_old_raw); 868 if (ret < 0) 869 return ret; 870 871 /* Use extended mode calculations */ 872 ambient = mlx90632_preprocess_temp_amb(ambient_new_raw, 873 ambient_old_raw, Gb); 874 object = mlx90632_preprocess_temp_obj_extended(object_new_raw, 875 ambient_new_raw, 876 ambient_old_raw, Ka); 877 *val = mlx90632_calc_temp_object_extended(object, ambient, 878 data->object_ambient_temperature, 879 Ea, Eb, Fa, Fb, Ga, 880 Ha, Hb, data->emissivity); 881 return 0; 882 } 883 884 ambient = mlx90632_preprocess_temp_amb(ambient_new_raw, 885 ambient_old_raw, Gb); 886 object = mlx90632_preprocess_temp_obj(object_new_raw, 887 object_old_raw, 888 ambient_new_raw, 889 ambient_old_raw, Ka); 890 891 *val = mlx90632_calc_temp_object(object, ambient, Ea, Eb, Fa, Fb, Ga, 892 Ha, Hb, data->emissivity); 893 return 0; 894 } 895 896 static int mlx90632_calc_ambient_dsp105(struct mlx90632_data *data, int *val) 897 { 898 s16 ambient_new_raw, ambient_old_raw; 899 unsigned int read_tmp; 900 s32 PT, PR, PG, PO; 901 int ret; 902 s16 Gb; 903 904 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_R, &PR); 905 if (ret < 0) 906 return ret; 907 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_G, &PG); 908 if (ret < 0) 909 return ret; 910 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_T, &PT); 911 if (ret < 0) 912 return ret; 913 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_O, &PO); 914 if (ret < 0) 915 return ret; 916 ret = regmap_read(data->regmap, MLX90632_EE_Gb, &read_tmp); 917 if (ret < 0) 918 return ret; 919 Gb = (s16)read_tmp; 920 921 ret = mlx90632_read_ambient_raw(data->regmap, &ambient_new_raw, 922 &ambient_old_raw); 923 if (ret < 0) 924 return ret; 925 *val = mlx90632_calc_temp_ambient(ambient_new_raw, ambient_old_raw, 926 PT, PR, PG, PO, Gb); 927 return ret; 928 } 929 930 static int mlx90632_get_refresh_rate(struct mlx90632_data *data, 931 int *refresh_rate) 932 { 933 unsigned int meas1; 934 int ret; 935 936 ret = regmap_read(data->regmap, MLX90632_EE_MEDICAL_MEAS1, &meas1); 937 if (ret < 0) 938 return ret; 939 940 *refresh_rate = MLX90632_REFRESH_RATE(meas1); 941 942 return ret; 943 } 944 945 static const int mlx90632_freqs[][2] = { 946 {0, 500000}, 947 {1, 0}, 948 {2, 0}, 949 {4, 0}, 950 {8, 0}, 951 {16, 0}, 952 {32, 0}, 953 {64, 0} 954 }; 955 956 /** 957 * mlx90632_pm_interraction_wakeup() - Measure time between user interactions to change powermode 958 * @data: pointer to mlx90632_data object containing interaction_ts information 959 * 960 * Switch to continuous mode when interaction is faster than MLX90632_MEAS_MAX_TIME. Update the 961 * interaction_ts for each function call with the jiffies to enable measurement between function 962 * calls. Initial value of the interaction_ts needs to be set before this function call. 963 */ 964 static int mlx90632_pm_interraction_wakeup(struct mlx90632_data *data) 965 { 966 unsigned long now; 967 int ret; 968 969 now = jiffies; 970 if (time_in_range(now, data->interaction_ts, 971 data->interaction_ts + 972 msecs_to_jiffies(MLX90632_MEAS_MAX_TIME + 100))) { 973 if (data->powerstatus == MLX90632_PWR_STATUS_SLEEP_STEP) { 974 ret = mlx90632_pwr_continuous(data->regmap); 975 if (ret < 0) 976 return ret; 977 } 978 } 979 980 data->interaction_ts = now; 981 982 return 0; 983 } 984 985 static int mlx90632_read_raw(struct iio_dev *indio_dev, 986 struct iio_chan_spec const *channel, int *val, 987 int *val2, long mask) 988 { 989 struct mlx90632_data *data = iio_priv(indio_dev); 990 int ret; 991 int cr; 992 993 pm_runtime_get_sync(&data->client->dev); 994 ret = mlx90632_pm_interraction_wakeup(data); 995 if (ret < 0) 996 goto mlx90632_read_raw_pm; 997 998 switch (mask) { 999 case IIO_CHAN_INFO_PROCESSED: 1000 switch (channel->channel2) { 1001 case IIO_MOD_TEMP_AMBIENT: 1002 ret = mlx90632_calc_ambient_dsp105(data, val); 1003 if (ret < 0) 1004 goto mlx90632_read_raw_pm; 1005 1006 ret = IIO_VAL_INT; 1007 break; 1008 case IIO_MOD_TEMP_OBJECT: 1009 ret = mlx90632_calc_object_dsp105(data, val); 1010 if (ret < 0) 1011 goto mlx90632_read_raw_pm; 1012 1013 ret = IIO_VAL_INT; 1014 break; 1015 default: 1016 ret = -EINVAL; 1017 break; 1018 } 1019 break; 1020 case IIO_CHAN_INFO_CALIBEMISSIVITY: 1021 if (data->emissivity == 1000) { 1022 *val = 1; 1023 *val2 = 0; 1024 } else { 1025 *val = 0; 1026 *val2 = data->emissivity * 1000; 1027 } 1028 ret = IIO_VAL_INT_PLUS_MICRO; 1029 break; 1030 case IIO_CHAN_INFO_CALIBAMBIENT: 1031 *val = data->object_ambient_temperature; 1032 ret = IIO_VAL_INT; 1033 break; 1034 case IIO_CHAN_INFO_SAMP_FREQ: 1035 ret = mlx90632_get_refresh_rate(data, &cr); 1036 if (ret < 0) 1037 goto mlx90632_read_raw_pm; 1038 1039 *val = mlx90632_freqs[cr][0]; 1040 *val2 = mlx90632_freqs[cr][1]; 1041 ret = IIO_VAL_INT_PLUS_MICRO; 1042 break; 1043 default: 1044 ret = -EINVAL; 1045 break; 1046 } 1047 1048 mlx90632_read_raw_pm: 1049 pm_runtime_put_autosuspend(&data->client->dev); 1050 return ret; 1051 } 1052 1053 static int mlx90632_write_raw(struct iio_dev *indio_dev, 1054 struct iio_chan_spec const *channel, int val, 1055 int val2, long mask) 1056 { 1057 struct mlx90632_data *data = iio_priv(indio_dev); 1058 1059 switch (mask) { 1060 case IIO_CHAN_INFO_CALIBEMISSIVITY: 1061 /* Confirm we are within 0 and 1.0 */ 1062 if (val < 0 || val2 < 0 || val > 1 || 1063 (val == 1 && val2 != 0)) 1064 return -EINVAL; 1065 data->emissivity = val * 1000 + val2 / 1000; 1066 return 0; 1067 case IIO_CHAN_INFO_CALIBAMBIENT: 1068 data->object_ambient_temperature = val; 1069 return 0; 1070 default: 1071 return -EINVAL; 1072 } 1073 } 1074 1075 static int mlx90632_read_avail(struct iio_dev *indio_dev, 1076 struct iio_chan_spec const *chan, 1077 const int **vals, int *type, int *length, 1078 long mask) 1079 { 1080 switch (mask) { 1081 case IIO_CHAN_INFO_SAMP_FREQ: 1082 *vals = (int *)mlx90632_freqs; 1083 *type = IIO_VAL_INT_PLUS_MICRO; 1084 *length = 2 * ARRAY_SIZE(mlx90632_freqs); 1085 return IIO_AVAIL_LIST; 1086 default: 1087 return -EINVAL; 1088 } 1089 } 1090 1091 static const struct iio_chan_spec mlx90632_channels[] = { 1092 { 1093 .type = IIO_TEMP, 1094 .modified = 1, 1095 .channel2 = IIO_MOD_TEMP_AMBIENT, 1096 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), 1097 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), 1098 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_SAMP_FREQ), 1099 }, 1100 { 1101 .type = IIO_TEMP, 1102 .modified = 1, 1103 .channel2 = IIO_MOD_TEMP_OBJECT, 1104 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | 1105 BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) | BIT(IIO_CHAN_INFO_CALIBAMBIENT), 1106 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), 1107 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_SAMP_FREQ), 1108 }, 1109 }; 1110 1111 static const struct iio_info mlx90632_info = { 1112 .read_raw = mlx90632_read_raw, 1113 .write_raw = mlx90632_write_raw, 1114 .read_avail = mlx90632_read_avail, 1115 }; 1116 1117 static void mlx90632_sleep(void *_data) 1118 { 1119 struct mlx90632_data *data = _data; 1120 1121 mlx90632_pwr_set_sleep_step(data->regmap); 1122 } 1123 1124 static int mlx90632_suspend(struct mlx90632_data *data) 1125 { 1126 regcache_mark_dirty(data->regmap); 1127 1128 dev_dbg(&data->client->dev, "Requesting suspend"); 1129 return mlx90632_pwr_set_sleep_step(data->regmap); 1130 } 1131 1132 static int mlx90632_wakeup(struct mlx90632_data *data) 1133 { 1134 int ret; 1135 1136 ret = regcache_sync(data->regmap); 1137 if (ret < 0) { 1138 dev_err(&data->client->dev, 1139 "Failed to sync regmap registers: %d\n", ret); 1140 return ret; 1141 } 1142 1143 dev_dbg(&data->client->dev, "Requesting wake-up\n"); 1144 return mlx90632_pwr_continuous(data->regmap); 1145 } 1146 1147 static void mlx90632_disable_regulator(void *_data) 1148 { 1149 struct mlx90632_data *data = _data; 1150 int ret; 1151 1152 ret = regulator_disable(data->regulator); 1153 if (ret < 0) 1154 dev_err(regmap_get_device(data->regmap), 1155 "Failed to disable power regulator: %d\n", ret); 1156 } 1157 1158 static int mlx90632_enable_regulator(struct mlx90632_data *data) 1159 { 1160 int ret; 1161 1162 ret = regulator_enable(data->regulator); 1163 if (ret < 0) { 1164 dev_err(regmap_get_device(data->regmap), "Failed to enable power regulator!\n"); 1165 return ret; 1166 } 1167 1168 mlx90632_reset_delay(); 1169 1170 return ret; 1171 } 1172 1173 static int mlx90632_probe(struct i2c_client *client) 1174 { 1175 const struct i2c_device_id *id = i2c_client_get_device_id(client); 1176 struct mlx90632_data *mlx90632; 1177 struct iio_dev *indio_dev; 1178 struct regmap *regmap; 1179 unsigned int read; 1180 int ret; 1181 1182 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*mlx90632)); 1183 if (!indio_dev) 1184 return -ENOMEM; 1185 1186 regmap = devm_regmap_init_i2c(client, &mlx90632_regmap); 1187 if (IS_ERR(regmap)) { 1188 ret = PTR_ERR(regmap); 1189 dev_err(&client->dev, "Failed to allocate regmap: %d\n", ret); 1190 return ret; 1191 } 1192 1193 mlx90632 = iio_priv(indio_dev); 1194 i2c_set_clientdata(client, indio_dev); 1195 mlx90632->client = client; 1196 mlx90632->regmap = regmap; 1197 mlx90632->mtyp = MLX90632_MTYP_MEDICAL; 1198 mlx90632->powerstatus = MLX90632_PWR_STATUS_HALT; 1199 1200 mutex_init(&mlx90632->lock); 1201 indio_dev->name = id->name; 1202 indio_dev->modes = INDIO_DIRECT_MODE; 1203 indio_dev->info = &mlx90632_info; 1204 indio_dev->channels = mlx90632_channels; 1205 indio_dev->num_channels = ARRAY_SIZE(mlx90632_channels); 1206 1207 mlx90632->regulator = devm_regulator_get(&client->dev, "vdd"); 1208 if (IS_ERR(mlx90632->regulator)) 1209 return dev_err_probe(&client->dev, PTR_ERR(mlx90632->regulator), 1210 "failed to get vdd regulator"); 1211 1212 ret = mlx90632_enable_regulator(mlx90632); 1213 if (ret < 0) 1214 return ret; 1215 1216 ret = devm_add_action_or_reset(&client->dev, mlx90632_disable_regulator, 1217 mlx90632); 1218 if (ret < 0) { 1219 dev_err(&client->dev, "Failed to setup regulator cleanup action %d\n", 1220 ret); 1221 return ret; 1222 } 1223 1224 ret = mlx90632_wakeup(mlx90632); 1225 if (ret < 0) { 1226 dev_err(&client->dev, "Wakeup failed: %d\n", ret); 1227 return ret; 1228 } 1229 1230 ret = devm_add_action_or_reset(&client->dev, mlx90632_sleep, mlx90632); 1231 if (ret < 0) { 1232 dev_err(&client->dev, "Failed to setup low power cleanup action %d\n", 1233 ret); 1234 return ret; 1235 } 1236 1237 ret = regmap_read(mlx90632->regmap, MLX90632_EE_VERSION, &read); 1238 if (ret < 0) { 1239 dev_err(&client->dev, "read of version failed: %d\n", ret); 1240 return ret; 1241 } 1242 read = read & MLX90632_ID_MASK; 1243 if (read == MLX90632_ID_MEDICAL) { 1244 dev_dbg(&client->dev, 1245 "Detected Medical EEPROM calibration %x\n", read); 1246 } else if (read == MLX90632_ID_CONSUMER) { 1247 dev_dbg(&client->dev, 1248 "Detected Consumer EEPROM calibration %x\n", read); 1249 } else if (read == MLX90632_ID_EXTENDED) { 1250 dev_dbg(&client->dev, 1251 "Detected Extended range EEPROM calibration %x\n", read); 1252 mlx90632->mtyp = MLX90632_MTYP_EXTENDED; 1253 } else if ((read & MLX90632_DSP_MASK) == MLX90632_DSP_VERSION) { 1254 dev_dbg(&client->dev, 1255 "Detected Unknown EEPROM calibration %x\n", read); 1256 } else { 1257 dev_err(&client->dev, 1258 "Wrong DSP version %x (expected %x)\n", 1259 read, MLX90632_DSP_VERSION); 1260 return -EPROTONOSUPPORT; 1261 } 1262 1263 mlx90632->emissivity = 1000; 1264 mlx90632->object_ambient_temperature = 25000; /* 25 degrees milliCelsius */ 1265 mlx90632->interaction_ts = jiffies; /* Set initial value */ 1266 1267 pm_runtime_get_noresume(&client->dev); 1268 pm_runtime_set_active(&client->dev); 1269 1270 ret = devm_pm_runtime_enable(&client->dev); 1271 if (ret) 1272 return ret; 1273 1274 pm_runtime_set_autosuspend_delay(&client->dev, MLX90632_SLEEP_DELAY_MS); 1275 pm_runtime_use_autosuspend(&client->dev); 1276 pm_runtime_put_autosuspend(&client->dev); 1277 1278 return devm_iio_device_register(&client->dev, indio_dev); 1279 } 1280 1281 static const struct i2c_device_id mlx90632_id[] = { 1282 { .name = "mlx90632" }, 1283 { } 1284 }; 1285 MODULE_DEVICE_TABLE(i2c, mlx90632_id); 1286 1287 static const struct of_device_id mlx90632_of_match[] = { 1288 { .compatible = "melexis,mlx90632" }, 1289 { } 1290 }; 1291 MODULE_DEVICE_TABLE(of, mlx90632_of_match); 1292 1293 static int mlx90632_pm_suspend(struct device *dev) 1294 { 1295 struct mlx90632_data *data = iio_priv(dev_get_drvdata(dev)); 1296 int ret; 1297 1298 ret = mlx90632_suspend(data); 1299 if (ret < 0) 1300 return ret; 1301 1302 ret = regulator_disable(data->regulator); 1303 if (ret < 0) 1304 dev_err(regmap_get_device(data->regmap), 1305 "Failed to disable power regulator: %d\n", ret); 1306 1307 return ret; 1308 } 1309 1310 static int mlx90632_pm_resume(struct device *dev) 1311 { 1312 struct mlx90632_data *data = iio_priv(dev_get_drvdata(dev)); 1313 int ret; 1314 1315 ret = mlx90632_enable_regulator(data); 1316 if (ret < 0) 1317 return ret; 1318 1319 return mlx90632_wakeup(data); 1320 } 1321 1322 static int mlx90632_pm_runtime_suspend(struct device *dev) 1323 { 1324 struct mlx90632_data *data = iio_priv(dev_get_drvdata(dev)); 1325 1326 return mlx90632_pwr_set_sleep_step(data->regmap); 1327 } 1328 1329 static const struct dev_pm_ops mlx90632_pm_ops = { 1330 SYSTEM_SLEEP_PM_OPS(mlx90632_pm_suspend, mlx90632_pm_resume) 1331 RUNTIME_PM_OPS(mlx90632_pm_runtime_suspend, NULL, NULL) 1332 }; 1333 1334 static struct i2c_driver mlx90632_driver = { 1335 .driver = { 1336 .name = "mlx90632", 1337 .of_match_table = mlx90632_of_match, 1338 .pm = pm_ptr(&mlx90632_pm_ops), 1339 }, 1340 .probe = mlx90632_probe, 1341 .id_table = mlx90632_id, 1342 }; 1343 module_i2c_driver(mlx90632_driver); 1344 1345 MODULE_AUTHOR("Crt Mori <cmo@melexis.com>"); 1346 MODULE_DESCRIPTION("Melexis MLX90632 contactless Infra Red temperature sensor driver"); 1347 MODULE_LICENSE("GPL v2"); 1348