1 // SPDX-License-Identifier: GPL-2.0
3 * mlx90632.c - Melexis MLX90632 contactless IR temperature sensor
5 * Copyright (c) 2017 Melexis <cmo@melexis.com>
7 * Driver for the Melexis MLX90632 I2C 16-bit IR thermopile sensor
9 #include <linux/delay.h>
10 #include <linux/err.h>
11 #include <linux/gpio/consumer.h>
12 #include <linux/i2c.h>
13 #include <linux/iopoll.h>
14 #include <linux/kernel.h>
15 #include <linux/limits.h>
16 #include <linux/mod_devicetable.h>
17 #include <linux/module.h>
18 #include <linux/math64.h>
19 #include <linux/pm_runtime.h>
20 #include <linux/regmap.h>
21 #include <linux/regulator/consumer.h>
23 #include <linux/iio/iio.h>
24 #include <linux/iio/sysfs.h>
26 /* Memory sections addresses */
27 #define MLX90632_ADDR_RAM 0x4000 /* Start address of ram */
28 #define MLX90632_ADDR_EEPROM 0x2480 /* Start address of user eeprom */
30 /* EEPROM addresses - used at startup */
31 #define MLX90632_EE_CTRL 0x24d4 /* Control register initial value */
32 #define MLX90632_EE_I2C_ADDR 0x24d5 /* I2C address register initial value */
33 #define MLX90632_EE_VERSION 0x240b /* EEPROM version reg address */
34 #define MLX90632_EE_P_R 0x240c /* P_R calibration register 32bit */
35 #define MLX90632_EE_P_G 0x240e /* P_G calibration register 32bit */
36 #define MLX90632_EE_P_T 0x2410 /* P_T calibration register 32bit */
37 #define MLX90632_EE_P_O 0x2412 /* P_O calibration register 32bit */
38 #define MLX90632_EE_Aa 0x2414 /* Aa calibration register 32bit */
39 #define MLX90632_EE_Ab 0x2416 /* Ab calibration register 32bit */
40 #define MLX90632_EE_Ba 0x2418 /* Ba calibration register 32bit */
41 #define MLX90632_EE_Bb 0x241a /* Bb calibration register 32bit */
42 #define MLX90632_EE_Ca 0x241c /* Ca calibration register 32bit */
43 #define MLX90632_EE_Cb 0x241e /* Cb calibration register 32bit */
44 #define MLX90632_EE_Da 0x2420 /* Da calibration register 32bit */
45 #define MLX90632_EE_Db 0x2422 /* Db calibration register 32bit */
46 #define MLX90632_EE_Ea 0x2424 /* Ea calibration register 32bit */
47 #define MLX90632_EE_Eb 0x2426 /* Eb calibration register 32bit */
48 #define MLX90632_EE_Fa 0x2428 /* Fa calibration register 32bit */
49 #define MLX90632_EE_Fb 0x242a /* Fb calibration register 32bit */
50 #define MLX90632_EE_Ga 0x242c /* Ga calibration register 32bit */
52 #define MLX90632_EE_Gb 0x242e /* Gb calibration register 16bit */
53 #define MLX90632_EE_Ka 0x242f /* Ka calibration register 16bit */
55 #define MLX90632_EE_Ha 0x2481 /* Ha customer calib value reg 16bit */
56 #define MLX90632_EE_Hb 0x2482 /* Hb customer calib value reg 16bit */
58 /* Register addresses - volatile */
59 #define MLX90632_REG_I2C_ADDR 0x3000 /* Chip I2C address register */
61 /* Control register address - volatile */
62 #define MLX90632_REG_CONTROL 0x3001 /* Control Register address */
63 #define MLX90632_CFG_PWR_MASK GENMASK(2, 1) /* PowerMode Mask */
64 #define MLX90632_CFG_MTYP_MASK GENMASK(8, 4) /* Meas select Mask */
66 /* PowerModes statuses */
67 #define MLX90632_PWR_STATUS(ctrl_val) (ctrl_val << 1)
68 #define MLX90632_PWR_STATUS_HALT MLX90632_PWR_STATUS(0) /* hold */
69 #define MLX90632_PWR_STATUS_SLEEP_STEP MLX90632_PWR_STATUS(1) /* sleep step*/
70 #define MLX90632_PWR_STATUS_STEP MLX90632_PWR_STATUS(2) /* step */
71 #define MLX90632_PWR_STATUS_CONTINUOUS MLX90632_PWR_STATUS(3) /* continuous*/
73 /* Measurement types */
74 #define MLX90632_MTYP_MEDICAL 0
75 #define MLX90632_MTYP_EXTENDED 17
77 /* Measurement type select*/
78 #define MLX90632_MTYP_STATUS(ctrl_val) (ctrl_val << 4)
79 #define MLX90632_MTYP_STATUS_MEDICAL MLX90632_MTYP_STATUS(MLX90632_MTYP_MEDICAL)
80 #define MLX90632_MTYP_STATUS_EXTENDED MLX90632_MTYP_STATUS(MLX90632_MTYP_EXTENDED)
82 /* I2C command register - volatile */
83 #define MLX90632_REG_I2C_CMD 0x3005 /* I2C command Register address */
85 /* Device status register - volatile */
86 #define MLX90632_REG_STATUS 0x3fff /* Device status register */
87 #define MLX90632_STAT_BUSY BIT(10) /* Device busy indicator */
88 #define MLX90632_STAT_EE_BUSY BIT(9) /* EEPROM busy indicator */
89 #define MLX90632_STAT_BRST BIT(8) /* Brown out reset indicator */
90 #define MLX90632_STAT_CYCLE_POS GENMASK(6, 2) /* Data position */
91 #define MLX90632_STAT_DATA_RDY BIT(0) /* Data ready indicator */
93 /* RAM_MEAS address-es for each channel */
94 #define MLX90632_RAM_1(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num)
95 #define MLX90632_RAM_2(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num + 1)
96 #define MLX90632_RAM_3(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num + 2)
98 /* Name important RAM_MEAS channels */
99 #define MLX90632_RAM_DSP5_EXTENDED_AMBIENT_1 MLX90632_RAM_3(17)
100 #define MLX90632_RAM_DSP5_EXTENDED_AMBIENT_2 MLX90632_RAM_3(18)
101 #define MLX90632_RAM_DSP5_EXTENDED_OBJECT_1 MLX90632_RAM_1(17)
102 #define MLX90632_RAM_DSP5_EXTENDED_OBJECT_2 MLX90632_RAM_2(17)
103 #define MLX90632_RAM_DSP5_EXTENDED_OBJECT_3 MLX90632_RAM_1(18)
104 #define MLX90632_RAM_DSP5_EXTENDED_OBJECT_4 MLX90632_RAM_2(18)
105 #define MLX90632_RAM_DSP5_EXTENDED_OBJECT_5 MLX90632_RAM_1(19)
106 #define MLX90632_RAM_DSP5_EXTENDED_OBJECT_6 MLX90632_RAM_2(19)
108 /* Magic constants */
109 #define MLX90632_ID_MEDICAL 0x0105 /* EEPROM DSPv5 Medical device id */
110 #define MLX90632_ID_CONSUMER 0x0205 /* EEPROM DSPv5 Consumer device id */
111 #define MLX90632_ID_EXTENDED 0x0505 /* EEPROM DSPv5 Extended range device id */
112 #define MLX90632_ID_MASK GENMASK(14, 0) /* DSP version and device ID in EE_VERSION */
113 #define MLX90632_DSP_VERSION 5 /* DSP version */
114 #define MLX90632_DSP_MASK GENMASK(7, 0) /* DSP version in EE_VERSION */
115 #define MLX90632_RESET_CMD 0x0006 /* Reset sensor (address or global) */
116 #define MLX90632_REF_12 12LL /* ResCtrlRef value of Ch 1 or Ch 2 */
117 #define MLX90632_REF_3 12LL /* ResCtrlRef value of Channel 3 */
118 #define MLX90632_MAX_MEAS_NUM 31 /* Maximum measurements in list */
119 #define MLX90632_SLEEP_DELAY_MS 3000 /* Autosleep delay */
120 #define MLX90632_EXTENDED_LIMIT 27000 /* Extended mode raw value limit */
123 * struct mlx90632_data - private data for the MLX90632 device
124 * @client: I2C client of the device
125 * @lock: Internal mutex for multiple reads for single measurement
126 * @regmap: Regmap of the device
127 * @emissivity: Object emissivity from 0 to 1000 where 1000 = 1.
128 * @mtyp: Measurement type physical sensor configuration for extended range
130 * @object_ambient_temperature: Ambient temperature at object (might differ of
131 * the ambient temperature of sensor.
132 * @regulator: Regulator of the device
134 struct mlx90632_data {
135 struct i2c_client *client;
137 struct regmap *regmap;
140 u32 object_ambient_temperature;
141 struct regulator *regulator;
144 static const struct regmap_range mlx90632_volatile_reg_range[] = {
145 regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL),
146 regmap_reg_range(MLX90632_REG_I2C_CMD, MLX90632_REG_I2C_CMD),
147 regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS),
148 regmap_reg_range(MLX90632_RAM_1(0),
149 MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
152 static const struct regmap_access_table mlx90632_volatile_regs_tbl = {
153 .yes_ranges = mlx90632_volatile_reg_range,
154 .n_yes_ranges = ARRAY_SIZE(mlx90632_volatile_reg_range),
157 static const struct regmap_range mlx90632_read_reg_range[] = {
158 regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka),
159 regmap_reg_range(MLX90632_EE_CTRL, MLX90632_EE_I2C_ADDR),
160 regmap_reg_range(MLX90632_EE_Ha, MLX90632_EE_Hb),
161 regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL),
162 regmap_reg_range(MLX90632_REG_I2C_CMD, MLX90632_REG_I2C_CMD),
163 regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS),
164 regmap_reg_range(MLX90632_RAM_1(0),
165 MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
168 static const struct regmap_access_table mlx90632_readable_regs_tbl = {
169 .yes_ranges = mlx90632_read_reg_range,
170 .n_yes_ranges = ARRAY_SIZE(mlx90632_read_reg_range),
173 static const struct regmap_range mlx90632_no_write_reg_range[] = {
174 regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka),
175 regmap_reg_range(MLX90632_RAM_1(0),
176 MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
179 static const struct regmap_access_table mlx90632_writeable_regs_tbl = {
180 .no_ranges = mlx90632_no_write_reg_range,
181 .n_no_ranges = ARRAY_SIZE(mlx90632_no_write_reg_range),
184 static const struct regmap_config mlx90632_regmap = {
188 .volatile_table = &mlx90632_volatile_regs_tbl,
189 .rd_table = &mlx90632_readable_regs_tbl,
190 .wr_table = &mlx90632_writeable_regs_tbl,
192 .use_single_read = true,
193 .use_single_write = true,
194 .reg_format_endian = REGMAP_ENDIAN_BIG,
195 .val_format_endian = REGMAP_ENDIAN_BIG,
196 .cache_type = REGCACHE_RBTREE,
199 static s32 mlx90632_pwr_set_sleep_step(struct regmap *regmap)
201 return regmap_update_bits(regmap, MLX90632_REG_CONTROL,
202 MLX90632_CFG_PWR_MASK,
203 MLX90632_PWR_STATUS_SLEEP_STEP);
206 static s32 mlx90632_pwr_continuous(struct regmap *regmap)
208 return regmap_update_bits(regmap, MLX90632_REG_CONTROL,
209 MLX90632_CFG_PWR_MASK,
210 MLX90632_PWR_STATUS_CONTINUOUS);
214 * mlx90632_reset_delay() - Give the mlx90632 some time to reset properly
215 * If this is not done, the following I2C command(s) will not be accepted.
217 static void mlx90632_reset_delay(void)
219 usleep_range(150, 200);
223 * mlx90632_perform_measurement() - Trigger and retrieve current measurement cycle
224 * @data: pointer to mlx90632_data object containing regmap information
226 * Perform a measurement and return latest measurement cycle position reported
227 * by sensor. This is a blocking function for 500ms, as that is default sensor
230 static int mlx90632_perform_measurement(struct mlx90632_data *data)
232 unsigned int reg_status;
235 ret = regmap_update_bits(data->regmap, MLX90632_REG_STATUS,
236 MLX90632_STAT_DATA_RDY, 0);
240 ret = regmap_read_poll_timeout(data->regmap, MLX90632_REG_STATUS, reg_status,
241 !(reg_status & MLX90632_STAT_DATA_RDY), 10000,
245 dev_err(&data->client->dev, "data not ready");
249 return (reg_status & MLX90632_STAT_CYCLE_POS) >> 2;
252 static int mlx90632_set_meas_type(struct regmap *regmap, u8 type)
256 if ((type != MLX90632_MTYP_MEDICAL) && (type != MLX90632_MTYP_EXTENDED))
259 ret = regmap_write(regmap, MLX90632_REG_I2C_CMD, MLX90632_RESET_CMD);
263 mlx90632_reset_delay();
265 ret = regmap_write_bits(regmap, MLX90632_REG_CONTROL,
266 (MLX90632_CFG_MTYP_MASK | MLX90632_CFG_PWR_MASK),
267 (MLX90632_MTYP_STATUS(type) | MLX90632_PWR_STATUS_HALT));
271 return mlx90632_pwr_continuous(regmap);
274 static int mlx90632_channel_new_select(int perform_ret, uint8_t *channel_new,
275 uint8_t *channel_old)
277 switch (perform_ret) {
293 static int mlx90632_read_ambient_raw(struct regmap *regmap,
294 s16 *ambient_new_raw, s16 *ambient_old_raw)
297 unsigned int read_tmp;
299 ret = regmap_read(regmap, MLX90632_RAM_3(1), &read_tmp);
302 *ambient_new_raw = (s16)read_tmp;
304 ret = regmap_read(regmap, MLX90632_RAM_3(2), &read_tmp);
307 *ambient_old_raw = (s16)read_tmp;
312 static int mlx90632_read_object_raw(struct regmap *regmap,
313 int perform_measurement_ret,
314 s16 *object_new_raw, s16 *object_old_raw)
317 unsigned int read_tmp;
322 ret = mlx90632_channel_new_select(perform_measurement_ret, &channel,
327 ret = regmap_read(regmap, MLX90632_RAM_2(channel), &read_tmp);
331 read = (s16)read_tmp;
333 ret = regmap_read(regmap, MLX90632_RAM_1(channel), &read_tmp);
336 *object_new_raw = (read + (s16)read_tmp) / 2;
338 ret = regmap_read(regmap, MLX90632_RAM_2(channel_old), &read_tmp);
341 read = (s16)read_tmp;
343 ret = regmap_read(regmap, MLX90632_RAM_1(channel_old), &read_tmp);
346 *object_old_raw = (read + (s16)read_tmp) / 2;
351 static int mlx90632_read_all_channel(struct mlx90632_data *data,
352 s16 *ambient_new_raw, s16 *ambient_old_raw,
353 s16 *object_new_raw, s16 *object_old_raw)
355 s32 ret, measurement;
357 mutex_lock(&data->lock);
358 measurement = mlx90632_perform_measurement(data);
359 if (measurement < 0) {
363 ret = mlx90632_read_ambient_raw(data->regmap, ambient_new_raw,
368 ret = mlx90632_read_object_raw(data->regmap, measurement,
369 object_new_raw, object_old_raw);
371 mutex_unlock(&data->lock);
375 static int mlx90632_read_ambient_raw_extended(struct regmap *regmap,
376 s16 *ambient_new_raw, s16 *ambient_old_raw)
378 unsigned int read_tmp;
381 ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_AMBIENT_1, &read_tmp);
384 *ambient_new_raw = (s16)read_tmp;
386 ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_AMBIENT_2, &read_tmp);
389 *ambient_old_raw = (s16)read_tmp;
394 static int mlx90632_read_object_raw_extended(struct regmap *regmap, s16 *object_new_raw)
396 unsigned int read_tmp;
400 ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_1, &read_tmp);
403 read = (s16)read_tmp;
405 ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_2, &read_tmp);
408 read = read - (s16)read_tmp;
410 ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_3, &read_tmp);
413 read = read - (s16)read_tmp;
415 ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_4, &read_tmp);
418 read = (read + (s16)read_tmp) / 2;
420 ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_5, &read_tmp);
423 read = read + (s16)read_tmp;
425 ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_6, &read_tmp);
428 read = read + (s16)read_tmp;
430 if (read > S16_MAX || read < S16_MIN)
433 *object_new_raw = read;
438 static int mlx90632_read_all_channel_extended(struct mlx90632_data *data, s16 *object_new_raw,
439 s16 *ambient_new_raw, s16 *ambient_old_raw)
443 mutex_lock(&data->lock);
444 ret = mlx90632_set_meas_type(data->regmap, MLX90632_MTYP_EXTENDED);
448 ret = read_poll_timeout(mlx90632_perform_measurement, meas, meas == 19,
449 50000, 800000, false, data);
453 ret = mlx90632_read_object_raw_extended(data->regmap, object_new_raw);
457 ret = mlx90632_read_ambient_raw_extended(data->regmap, ambient_new_raw, ambient_old_raw);
460 (void) mlx90632_set_meas_type(data->regmap, MLX90632_MTYP_MEDICAL);
462 mutex_unlock(&data->lock);
466 static int mlx90632_read_ee_register(struct regmap *regmap, u16 reg_lsb,
473 ret = regmap_read(regmap, reg_lsb, &read);
479 ret = regmap_read(regmap, reg_lsb + 1, &read);
483 *reg_value = (read << 16) | (value & 0xffff);
488 static s64 mlx90632_preprocess_temp_amb(s16 ambient_new_raw,
489 s16 ambient_old_raw, s16 Gb)
493 kGb = ((s64)Gb * 1000LL) >> 10ULL;
494 VR_Ta = (s64)ambient_old_raw * 1000000LL +
495 kGb * div64_s64(((s64)ambient_new_raw * 1000LL),
498 div64_s64(((s64)ambient_new_raw * 1000000000000LL),
499 (MLX90632_REF_3)), VR_Ta);
500 return div64_s64(tmp << 19ULL, 1000LL);
503 static s64 mlx90632_preprocess_temp_obj(s16 object_new_raw, s16 object_old_raw,
505 s16 ambient_old_raw, s16 Ka)
509 kKa = ((s64)Ka * 1000LL) >> 10ULL;
510 VR_IR = (s64)ambient_old_raw * 1000000LL +
511 kKa * div64_s64(((s64)ambient_new_raw * 1000LL),
514 div64_s64(((s64)((object_new_raw + object_old_raw) / 2)
515 * 1000000000000LL), (MLX90632_REF_12)),
517 return div64_s64((tmp << 19ULL), 1000LL);
520 static s64 mlx90632_preprocess_temp_obj_extended(s16 object_new_raw, s16 ambient_new_raw,
521 s16 ambient_old_raw, s16 Ka)
525 kKa = ((s64)Ka * 1000LL) >> 10ULL;
526 VR_IR = (s64)ambient_old_raw * 1000000LL +
527 kKa * div64_s64((s64)ambient_new_raw * 1000LL,
530 div64_s64((s64) object_new_raw * 1000000000000LL, MLX90632_REF_12),
532 return div64_s64(tmp << 19ULL, 1000LL);
535 static s32 mlx90632_calc_temp_ambient(s16 ambient_new_raw, s16 ambient_old_raw,
536 s32 P_T, s32 P_R, s32 P_G, s32 P_O, s16 Gb)
538 s64 Asub, Bsub, Ablock, Bblock, Cblock, AMB, sum;
540 AMB = mlx90632_preprocess_temp_amb(ambient_new_raw, ambient_old_raw,
542 Asub = ((s64)P_T * 10000000000LL) >> 44ULL;
543 Bsub = AMB - (((s64)P_R * 1000LL) >> 8ULL);
544 Ablock = Asub * (Bsub * Bsub);
545 Bblock = (div64_s64(Bsub * 10000000LL, P_G)) << 20ULL;
546 Cblock = ((s64)P_O * 10000000000LL) >> 8ULL;
548 sum = div64_s64(Ablock, 1000000LL) + Bblock + Cblock;
550 return div64_s64(sum, 10000000LL);
553 static s32 mlx90632_calc_temp_object_iteration(s32 prev_object_temp, s64 object,
554 s64 TAdut, s64 TAdut4, s32 Fa, s32 Fb,
555 s32 Ga, s16 Ha, s16 Hb,
558 s64 calcedKsTO, calcedKsTA, ir_Alpha, Alpha_corr;
559 s64 Ha_customer, Hb_customer;
561 Ha_customer = ((s64)Ha * 1000000LL) >> 14ULL;
562 Hb_customer = ((s64)Hb * 100) >> 10ULL;
564 calcedKsTO = ((s64)((s64)Ga * (prev_object_temp - 25 * 1000LL)
566 calcedKsTA = ((s64)(Fb * (TAdut - 25 * 1000000LL))) >> 36LL;
567 Alpha_corr = div64_s64((((s64)(Fa * 10000000000LL) >> 46LL)
568 * Ha_customer), 1000LL);
569 Alpha_corr *= ((s64)(1 * 1000000LL + calcedKsTO + calcedKsTA));
570 Alpha_corr = emissivity * div64_s64(Alpha_corr, 100000LL);
571 Alpha_corr = div64_s64(Alpha_corr, 1000LL);
572 ir_Alpha = div64_s64((s64)object * 10000000LL, Alpha_corr);
574 return (int_sqrt64(int_sqrt64(ir_Alpha * 1000000000000LL + TAdut4))
575 - 27315 - Hb_customer) * 10;
578 static s64 mlx90632_calc_ta4(s64 TAdut, s64 scale)
580 return (div64_s64(TAdut, scale) + 27315) *
581 (div64_s64(TAdut, scale) + 27315) *
582 (div64_s64(TAdut, scale) + 27315) *
583 (div64_s64(TAdut, scale) + 27315);
586 static s32 mlx90632_calc_temp_object(s64 object, s64 ambient, s32 Ea, s32 Eb,
587 s32 Fa, s32 Fb, s32 Ga, s16 Ha, s16 Hb,
590 s64 kTA, kTA0, TAdut, TAdut4;
594 kTA = (Ea * 1000LL) >> 16LL;
595 kTA0 = (Eb * 1000LL) >> 8LL;
596 TAdut = div64_s64(((ambient - kTA0) * 1000000LL), kTA) + 25 * 1000000LL;
597 TAdut4 = mlx90632_calc_ta4(TAdut, 10000LL);
599 /* Iterations of calculation as described in datasheet */
600 for (i = 0; i < 5; ++i) {
601 temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut, TAdut4,
608 static s32 mlx90632_calc_temp_object_extended(s64 object, s64 ambient, s64 reflected,
609 s32 Ea, s32 Eb, s32 Fa, s32 Fb, s32 Ga,
610 s16 Ha, s16 Hb, u16 tmp_emi)
612 s64 kTA, kTA0, TAdut, TAdut4, Tr4, TaTr4;
616 kTA = (Ea * 1000LL) >> 16LL;
617 kTA0 = (Eb * 1000LL) >> 8LL;
618 TAdut = div64_s64((ambient - kTA0) * 1000000LL, kTA) + 25 * 1000000LL;
619 Tr4 = mlx90632_calc_ta4(reflected, 10);
620 TAdut4 = mlx90632_calc_ta4(TAdut, 10000LL);
621 TaTr4 = Tr4 - div64_s64(Tr4 - TAdut4, tmp_emi) * 1000;
623 /* Iterations of calculation as described in datasheet */
624 for (i = 0; i < 5; ++i) {
625 temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut, TaTr4,
626 Fa / 2, Fb, Ga, Ha, Hb,
633 static int mlx90632_calc_object_dsp105(struct mlx90632_data *data, int *val)
636 s32 Ea, Eb, Fa, Fb, Ga;
637 unsigned int read_tmp;
639 s16 ambient_new_raw, ambient_old_raw, object_new_raw, object_old_raw;
642 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Ea, &Ea);
645 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Eb, &Eb);
648 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Fa, &Fa);
651 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Fb, &Fb);
654 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Ga, &Ga);
657 ret = regmap_read(data->regmap, MLX90632_EE_Ha, &read_tmp);
661 ret = regmap_read(data->regmap, MLX90632_EE_Hb, &read_tmp);
665 ret = regmap_read(data->regmap, MLX90632_EE_Gb, &read_tmp);
669 ret = regmap_read(data->regmap, MLX90632_EE_Ka, &read_tmp);
674 ret = mlx90632_read_all_channel(data,
675 &ambient_new_raw, &ambient_old_raw,
676 &object_new_raw, &object_old_raw);
680 if (object_new_raw > MLX90632_EXTENDED_LIMIT &&
681 data->mtyp == MLX90632_MTYP_EXTENDED) {
682 ret = mlx90632_read_all_channel_extended(data, &object_new_raw,
683 &ambient_new_raw, &ambient_old_raw);
687 /* Use extended mode calculations */
688 ambient = mlx90632_preprocess_temp_amb(ambient_new_raw,
689 ambient_old_raw, Gb);
690 object = mlx90632_preprocess_temp_obj_extended(object_new_raw,
692 ambient_old_raw, Ka);
693 *val = mlx90632_calc_temp_object_extended(object, ambient,
694 data->object_ambient_temperature,
696 Ha, Hb, data->emissivity);
700 ambient = mlx90632_preprocess_temp_amb(ambient_new_raw,
701 ambient_old_raw, Gb);
702 object = mlx90632_preprocess_temp_obj(object_new_raw,
705 ambient_old_raw, Ka);
707 *val = mlx90632_calc_temp_object(object, ambient, Ea, Eb, Fa, Fb, Ga,
708 Ha, Hb, data->emissivity);
712 static int mlx90632_calc_ambient_dsp105(struct mlx90632_data *data, int *val)
715 unsigned int read_tmp;
718 s16 ambient_new_raw, ambient_old_raw;
720 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_R, &PR);
723 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_G, &PG);
726 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_T, &PT);
729 ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_O, &PO);
732 ret = regmap_read(data->regmap, MLX90632_EE_Gb, &read_tmp);
737 ret = mlx90632_read_ambient_raw(data->regmap, &ambient_new_raw,
741 *val = mlx90632_calc_temp_ambient(ambient_new_raw, ambient_old_raw,
746 static int mlx90632_read_raw(struct iio_dev *indio_dev,
747 struct iio_chan_spec const *channel, int *val,
748 int *val2, long mask)
750 struct mlx90632_data *data = iio_priv(indio_dev);
754 case IIO_CHAN_INFO_PROCESSED:
755 switch (channel->channel2) {
756 case IIO_MOD_TEMP_AMBIENT:
757 ret = mlx90632_calc_ambient_dsp105(data, val);
761 case IIO_MOD_TEMP_OBJECT:
762 ret = mlx90632_calc_object_dsp105(data, val);
769 case IIO_CHAN_INFO_CALIBEMISSIVITY:
770 if (data->emissivity == 1000) {
775 *val2 = data->emissivity * 1000;
777 return IIO_VAL_INT_PLUS_MICRO;
778 case IIO_CHAN_INFO_CALIBAMBIENT:
779 *val = data->object_ambient_temperature;
786 static int mlx90632_write_raw(struct iio_dev *indio_dev,
787 struct iio_chan_spec const *channel, int val,
790 struct mlx90632_data *data = iio_priv(indio_dev);
793 case IIO_CHAN_INFO_CALIBEMISSIVITY:
794 /* Confirm we are within 0 and 1.0 */
795 if (val < 0 || val2 < 0 || val > 1 ||
796 (val == 1 && val2 != 0))
798 data->emissivity = val * 1000 + val2 / 1000;
800 case IIO_CHAN_INFO_CALIBAMBIENT:
801 data->object_ambient_temperature = val;
808 static const struct iio_chan_spec mlx90632_channels[] = {
812 .channel2 = IIO_MOD_TEMP_AMBIENT,
813 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
818 .channel2 = IIO_MOD_TEMP_OBJECT,
819 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
820 BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) | BIT(IIO_CHAN_INFO_CALIBAMBIENT),
824 static const struct iio_info mlx90632_info = {
825 .read_raw = mlx90632_read_raw,
826 .write_raw = mlx90632_write_raw,
829 static int mlx90632_sleep(struct mlx90632_data *data)
831 regcache_mark_dirty(data->regmap);
833 dev_dbg(&data->client->dev, "Requesting sleep");
834 return mlx90632_pwr_set_sleep_step(data->regmap);
837 static int mlx90632_wakeup(struct mlx90632_data *data)
841 ret = regcache_sync(data->regmap);
843 dev_err(&data->client->dev,
844 "Failed to sync regmap registers: %d\n", ret);
848 dev_dbg(&data->client->dev, "Requesting wake-up\n");
849 return mlx90632_pwr_continuous(data->regmap);
852 static void mlx90632_disable_regulator(void *_data)
854 struct mlx90632_data *data = _data;
857 ret = regulator_disable(data->regulator);
859 dev_err(regmap_get_device(data->regmap),
860 "Failed to disable power regulator: %d\n", ret);
863 static int mlx90632_enable_regulator(struct mlx90632_data *data)
867 ret = regulator_enable(data->regulator);
869 dev_err(regmap_get_device(data->regmap), "Failed to enable power regulator!\n");
873 mlx90632_reset_delay();
878 static int mlx90632_probe(struct i2c_client *client,
879 const struct i2c_device_id *id)
881 struct iio_dev *indio_dev;
882 struct mlx90632_data *mlx90632;
883 struct regmap *regmap;
887 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*mlx90632));
889 dev_err(&client->dev, "Failed to allocate device\n");
893 regmap = devm_regmap_init_i2c(client, &mlx90632_regmap);
894 if (IS_ERR(regmap)) {
895 ret = PTR_ERR(regmap);
896 dev_err(&client->dev, "Failed to allocate regmap: %d\n", ret);
900 mlx90632 = iio_priv(indio_dev);
901 i2c_set_clientdata(client, indio_dev);
902 mlx90632->client = client;
903 mlx90632->regmap = regmap;
904 mlx90632->mtyp = MLX90632_MTYP_MEDICAL;
906 mutex_init(&mlx90632->lock);
907 indio_dev->name = id->name;
908 indio_dev->modes = INDIO_DIRECT_MODE;
909 indio_dev->info = &mlx90632_info;
910 indio_dev->channels = mlx90632_channels;
911 indio_dev->num_channels = ARRAY_SIZE(mlx90632_channels);
913 mlx90632->regulator = devm_regulator_get(&client->dev, "vdd");
914 if (IS_ERR(mlx90632->regulator))
915 return dev_err_probe(&client->dev, PTR_ERR(mlx90632->regulator),
916 "failed to get vdd regulator");
918 ret = mlx90632_enable_regulator(mlx90632);
922 ret = devm_add_action_or_reset(&client->dev, mlx90632_disable_regulator,
925 dev_err(&client->dev, "Failed to setup regulator cleanup action %d\n",
930 ret = mlx90632_wakeup(mlx90632);
932 dev_err(&client->dev, "Wakeup failed: %d\n", ret);
936 ret = regmap_read(mlx90632->regmap, MLX90632_EE_VERSION, &read);
938 dev_err(&client->dev, "read of version failed: %d\n", ret);
941 read = read & MLX90632_ID_MASK;
942 if (read == MLX90632_ID_MEDICAL) {
943 dev_dbg(&client->dev,
944 "Detected Medical EEPROM calibration %x\n", read);
945 } else if (read == MLX90632_ID_CONSUMER) {
946 dev_dbg(&client->dev,
947 "Detected Consumer EEPROM calibration %x\n", read);
948 } else if (read == MLX90632_ID_EXTENDED) {
949 dev_dbg(&client->dev,
950 "Detected Extended range EEPROM calibration %x\n", read);
951 mlx90632->mtyp = MLX90632_MTYP_EXTENDED;
952 } else if ((read & MLX90632_DSP_MASK) == MLX90632_DSP_VERSION) {
953 dev_dbg(&client->dev,
954 "Detected Unknown EEPROM calibration %x\n", read);
956 dev_err(&client->dev,
957 "Wrong DSP version %x (expected %x)\n",
958 read, MLX90632_DSP_VERSION);
959 return -EPROTONOSUPPORT;
962 mlx90632->emissivity = 1000;
963 mlx90632->object_ambient_temperature = 25000; /* 25 degrees milliCelsius */
965 pm_runtime_disable(&client->dev);
966 ret = pm_runtime_set_active(&client->dev);
968 mlx90632_sleep(mlx90632);
971 pm_runtime_enable(&client->dev);
972 pm_runtime_set_autosuspend_delay(&client->dev, MLX90632_SLEEP_DELAY_MS);
973 pm_runtime_use_autosuspend(&client->dev);
975 return iio_device_register(indio_dev);
978 static void mlx90632_remove(struct i2c_client *client)
980 struct iio_dev *indio_dev = i2c_get_clientdata(client);
981 struct mlx90632_data *data = iio_priv(indio_dev);
983 iio_device_unregister(indio_dev);
985 pm_runtime_disable(&client->dev);
986 pm_runtime_set_suspended(&client->dev);
987 pm_runtime_put_noidle(&client->dev);
989 mlx90632_sleep(data);
992 static const struct i2c_device_id mlx90632_id[] = {
996 MODULE_DEVICE_TABLE(i2c, mlx90632_id);
998 static const struct of_device_id mlx90632_of_match[] = {
999 { .compatible = "melexis,mlx90632" },
1002 MODULE_DEVICE_TABLE(of, mlx90632_of_match);
1004 static int __maybe_unused mlx90632_pm_suspend(struct device *dev)
1006 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1007 struct mlx90632_data *data = iio_priv(indio_dev);
1009 return mlx90632_sleep(data);
1012 static int __maybe_unused mlx90632_pm_resume(struct device *dev)
1014 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1015 struct mlx90632_data *data = iio_priv(indio_dev);
1017 return mlx90632_wakeup(data);
1020 static UNIVERSAL_DEV_PM_OPS(mlx90632_pm_ops, mlx90632_pm_suspend,
1021 mlx90632_pm_resume, NULL);
1023 static struct i2c_driver mlx90632_driver = {
1026 .of_match_table = mlx90632_of_match,
1027 .pm = &mlx90632_pm_ops,
1029 .probe = mlx90632_probe,
1030 .remove = mlx90632_remove,
1031 .id_table = mlx90632_id,
1033 module_i2c_driver(mlx90632_driver);
1035 MODULE_AUTHOR("Crt Mori <cmo@melexis.com>");
1036 MODULE_DESCRIPTION("Melexis MLX90632 contactless Infra Red temperature sensor driver");
1037 MODULE_LICENSE("GPL v2");