root/drivers/iio/temperature/mlx90632.c

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DEFINITIONS

This source file includes following definitions.
  1. mlx90632_pwr_set_sleep_step
  2. mlx90632_pwr_continuous
  3. mlx90632_perform_measurement
  4. mlx90632_channel_new_select
  5. mlx90632_read_ambient_raw
  6. mlx90632_read_object_raw
  7. mlx90632_read_all_channel
  8. mlx90632_read_ee_register
  9. mlx90632_preprocess_temp_amb
  10. mlx90632_preprocess_temp_obj
  11. mlx90632_calc_temp_ambient
  12. mlx90632_calc_temp_object_iteration
  13. mlx90632_calc_temp_object
  14. mlx90632_calc_object_dsp105
  15. mlx90632_calc_ambient_dsp105
  16. mlx90632_read_raw
  17. mlx90632_write_raw
  18. mlx90632_sleep
  19. mlx90632_wakeup
  20. mlx90632_probe
  21. mlx90632_remove
  22. mlx90632_pm_suspend
  23. mlx90632_pm_resume

   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                                   &reg_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");

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