iio: temperature: Adding support for MLX90632 (c87742ab) · Commits · e / devices / android_kernel_teracube_emerald

MAINTAINERS

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Original line number	Diff line number	Diff line
		@@ -8798,6 +8798,13 @@ W: http://www.melexis.com
		S: Supported
		F: drivers/iio/temperature/mlx90614.c

		MELEXIS MLX90632 DRIVER
		M: Crt Mori <cmo@melexis.com>
		L: linux-iio@vger.kernel.org
		W: http://www.melexis.com
		S: Supported
		F: drivers/iio/temperature/mlx90632.c

		MELFAS MIP4 TOUCHSCREEN DRIVER
		M: Sangwon Jee <jeesw@melfas.com>
		W: http://www.melfas.com

drivers/iio/temperature/Kconfig

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		@@ -43,6 +43,18 @@ config MLX90614
		This driver can also be built as a module. If so, the module will
		be called mlx90614.

		config MLX90632
		tristate "MLX90632 contact-less infrared sensor with medical accuracy"
		depends on I2C
		select REGMAP_I2C
		help
		If you say yes here you get support for the Melexis
		MLX90632 contact-less infrared sensor with medical accuracy
		connected with I2C.

		This driver can also be built as a module. If so, the module will
		be called mlx90632.

		config TMP006
		tristate "TMP006 infrared thermopile sensor"
		depends on I2C

drivers/iio/temperature/Makefile

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Original line number	Diff line number	Diff line
		@@ -6,6 +6,7 @@
		obj-$(CONFIG_HID_SENSOR_TEMP) += hid-sensor-temperature.o
		obj-$(CONFIG_MAXIM_THERMOCOUPLE) += maxim_thermocouple.o
		obj-$(CONFIG_MLX90614) += mlx90614.o
		obj-$(CONFIG_MLX90632) += mlx90632.o
		obj-$(CONFIG_TMP006) += tmp006.o
		obj-$(CONFIG_TMP007) += tmp007.o
		obj-$(CONFIG_TSYS01) += tsys01.o

drivers/iio/temperature/mlx90632.c

0 → 100644

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Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		/*
		* mlx90632.c - Melexis MLX90632 contactless IR temperature sensor
		*
		* Copyright (c) 2017 Melexis <cmo@melexis.com>
		*
		* Driver for the Melexis MLX90632 I2C 16-bit IR thermopile sensor
		*/
		#include <linux/delay.h>
		#include <linux/err.h>
		#include <linux/gpio/consumer.h>
		#include <linux/i2c.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/math64.h>
		#include <linux/of.h>
		#include <linux/pm_runtime.h>
		#include <linux/regmap.h>

		#include <linux/iio/iio.h>
		#include <linux/iio/sysfs.h>

		/* Memory sections addresses */
		#define MLX90632_ADDR_RAM 0x4000 /* Start address of ram */
		#define MLX90632_ADDR_EEPROM 0x2480 /* Start address of user eeprom */

		/* EEPROM addresses - used at startup */
		#define MLX90632_EE_CTRL 0x24d4 /* Control register initial value */
		#define MLX90632_EE_I2C_ADDR 0x24d5 /* I2C address register initial value */
		#define MLX90632_EE_VERSION 0x240b /* EEPROM version reg address */
		#define MLX90632_EE_P_R 0x240c /* P_R calibration register 32bit */
		#define MLX90632_EE_P_G 0x240e /* P_G calibration register 32bit */
		#define MLX90632_EE_P_T 0x2410 /* P_T calibration register 32bit */
		#define MLX90632_EE_P_O 0x2412 /* P_O calibration register 32bit */
		#define MLX90632_EE_Aa 0x2414 /* Aa calibration register 32bit */
		#define MLX90632_EE_Ab 0x2416 /* Ab calibration register 32bit */
		#define MLX90632_EE_Ba 0x2418 /* Ba calibration register 32bit */
		#define MLX90632_EE_Bb 0x241a /* Bb calibration register 32bit */
		#define MLX90632_EE_Ca 0x241c /* Ca calibration register 32bit */
		#define MLX90632_EE_Cb 0x241e /* Cb calibration register 32bit */
		#define MLX90632_EE_Da 0x2420 /* Da calibration register 32bit */
		#define MLX90632_EE_Db 0x2422 /* Db calibration register 32bit */
		#define MLX90632_EE_Ea 0x2424 /* Ea calibration register 32bit */
		#define MLX90632_EE_Eb 0x2426 /* Eb calibration register 32bit */
		#define MLX90632_EE_Fa 0x2428 /* Fa calibration register 32bit */
		#define MLX90632_EE_Fb 0x242a /* Fb calibration register 32bit */
		#define MLX90632_EE_Ga 0x242c /* Ga calibration register 32bit */

		#define MLX90632_EE_Gb 0x242e /* Gb calibration register 16bit */
		#define MLX90632_EE_Ka 0x242f /* Ka calibration register 16bit */

		#define MLX90632_EE_Ha 0x2481 /* Ha customer calib value reg 16bit */
		#define MLX90632_EE_Hb 0x2482 /* Hb customer calib value reg 16bit */

		/* Register addresses - volatile */
		#define MLX90632_REG_I2C_ADDR 0x3000 /* Chip I2C address register */

		/* Control register address - volatile */
		#define MLX90632_REG_CONTROL 0x3001 /* Control Register address */
		#define MLX90632_CFG_PWR_MASK GENMASK(2, 1) /* PowerMode Mask */
		/* PowerModes statuses */
		#define MLX90632_PWR_STATUS(ctrl_val) (ctrl_val << 1)
		#define MLX90632_PWR_STATUS_HALT MLX90632_PWR_STATUS(0) /* hold */
		#define MLX90632_PWR_STATUS_SLEEP_STEP MLX90632_PWR_STATUS(1) /* sleep step*/
		#define MLX90632_PWR_STATUS_STEP MLX90632_PWR_STATUS(2) /* step */
		#define MLX90632_PWR_STATUS_CONTINUOUS MLX90632_PWR_STATUS(3) /* continuous*/

		/* Device status register - volatile */
		#define MLX90632_REG_STATUS 0x3fff /* Device status register */
		#define MLX90632_STAT_BUSY BIT(10) /* Device busy indicator */
		#define MLX90632_STAT_EE_BUSY BIT(9) /* EEPROM busy indicator */
		#define MLX90632_STAT_BRST BIT(8) /* Brown out reset indicator */
		#define MLX90632_STAT_CYCLE_POS GENMASK(6, 2) /* Data position */
		#define MLX90632_STAT_DATA_RDY BIT(0) /* Data ready indicator */

		/* RAM_MEAS address-es for each channel */
		#define MLX90632_RAM_1(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num)
		#define MLX90632_RAM_2(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num + 1)
		#define MLX90632_RAM_3(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num + 2)

		/* Magic constants */
		#define MLX90632_ID_MEDICAL 0x0105 /* EEPROM DSPv5 Medical device id */
		#define MLX90632_ID_CONSUMER 0x0205 /* EEPROM DSPv5 Consumer device id */
		#define MLX90632_RESET_CMD 0x0006 /* Reset sensor (address or global) */
		#define MLX90632_REF_12 12LL /*< ResCtrlRef value of Ch 1 or Ch 2 /
		#define MLX90632_REF_3 12LL /*< ResCtrlRef value of Channel 3 /
		#define MLX90632_MAX_MEAS_NUM 31 /*< Maximum measurements in list /
		#define MLX90632_SLEEP_DELAY_MS 3000 /*< Autosleep delay /

		struct mlx90632_data {
		struct i2c_client *client;
		struct mutex lock; /* Multiple reads for single measurement */
		struct regmap *regmap;
		u16 emissivity;
		};

		static const struct regmap_range mlx90632_volatile_reg_range[] = {
		regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL),
		regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS),
		regmap_reg_range(MLX90632_RAM_1(0),
		MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
		};

		static const struct regmap_access_table mlx90632_volatile_regs_tbl = {
		.yes_ranges = mlx90632_volatile_reg_range,
		.n_yes_ranges = ARRAY_SIZE(mlx90632_volatile_reg_range),
		};

		static const struct regmap_range mlx90632_read_reg_range[] = {
		regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka),
		regmap_reg_range(MLX90632_EE_CTRL, MLX90632_EE_I2C_ADDR),
		regmap_reg_range(MLX90632_EE_Ha, MLX90632_EE_Hb),
		regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL),
		regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS),
		regmap_reg_range(MLX90632_RAM_1(0),
		MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
		};

		static const struct regmap_access_table mlx90632_readable_regs_tbl = {
		.yes_ranges = mlx90632_read_reg_range,
		.n_yes_ranges = ARRAY_SIZE(mlx90632_read_reg_range),
		};

		static const struct regmap_range mlx90632_no_write_reg_range[] = {
		regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka),
		regmap_reg_range(MLX90632_RAM_1(0),
		MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
		};

		static const struct regmap_access_table mlx90632_writeable_regs_tbl = {
		.no_ranges = mlx90632_no_write_reg_range,
		.n_no_ranges = ARRAY_SIZE(mlx90632_no_write_reg_range),
		};

		static const struct regmap_config mlx90632_regmap = {
		.reg_bits = 16,
		.val_bits = 16,

		.volatile_table = &mlx90632_volatile_regs_tbl,
		.rd_table = &mlx90632_readable_regs_tbl,
		.wr_table = &mlx90632_writeable_regs_tbl,

		.use_single_rw = true,
		.reg_format_endian = REGMAP_ENDIAN_BIG,
		.val_format_endian = REGMAP_ENDIAN_BIG,
		.cache_type = REGCACHE_RBTREE,
		};

		static s32 mlx90632_pwr_set_sleep_step(struct regmap *regmap)
		{
		return regmap_update_bits(regmap, MLX90632_REG_CONTROL,
		MLX90632_CFG_PWR_MASK,
		MLX90632_PWR_STATUS_SLEEP_STEP);
		}

		static s32 mlx90632_pwr_continuous(struct regmap *regmap)
		{
		return regmap_update_bits(regmap, MLX90632_REG_CONTROL,
		MLX90632_CFG_PWR_MASK,
		MLX90632_PWR_STATUS_CONTINUOUS);
		}

		/**
		* mlx90632_perform_measurement - Trigger and retrieve current measurement cycle
		* @*data: pointer to mlx90632_data object containing regmap information
		*
		* Perform a measurement and return latest measurement cycle position reported
		* by sensor. This is a blocking function for 500ms, as that is default sensor
		* refresh rate.
		*/
		static int mlx90632_perform_measurement(struct mlx90632_data *data)
		{
		int ret, tries = 100;
		unsigned int reg_status;

		ret = regmap_update_bits(data->regmap, MLX90632_REG_STATUS,
		MLX90632_STAT_DATA_RDY, 0);
		if (ret < 0)
		return ret;

		while (tries-- > 0) {
		ret = regmap_read(data->regmap, MLX90632_REG_STATUS,
		&reg_status);
		if (ret < 0)
		return ret;
		if (reg_status & MLX90632_STAT_DATA_RDY)
		break;
		usleep_range(10000, 11000);
		}

		if (tries < 0) {
		dev_err(&data->client->dev, "data not ready");
		return -ETIMEDOUT;
		}

		return (reg_status & MLX90632_STAT_CYCLE_POS) >> 2;
		}

		static int mlx90632_channel_new_select(int perform_ret, uint8_t *channel_new,
		uint8_t *channel_old)
		{
		switch (perform_ret) {
		case 1:
		*channel_new = 1;
		*channel_old = 2;
		break;
		case 2:
		*channel_new = 2;
		*channel_old = 1;
		break;
		default:
		return -EINVAL;
		}

		return 0;
		}

		static int mlx90632_read_ambient_raw(struct regmap *regmap,
		s16 ambient_new_raw, s16 ambient_old_raw)
		{
		int ret;
		unsigned int read_tmp;

		ret = regmap_read(regmap, MLX90632_RAM_3(1), &read_tmp);
		if (ret < 0)
		return ret;
		*ambient_new_raw = (s16)read_tmp;

		ret = regmap_read(regmap, MLX90632_RAM_3(2), &read_tmp);
		if (ret < 0)
		return ret;
		*ambient_old_raw = (s16)read_tmp;

		return ret;
		}

		static int mlx90632_read_object_raw(struct regmap *regmap,
		int perform_measurement_ret,
		s16 object_new_raw, s16 object_old_raw)
		{
		int ret;
		unsigned int read_tmp;
		s16 read;
		u8 channel = 0;
		u8 channel_old = 0;

		ret = mlx90632_channel_new_select(perform_measurement_ret, &channel,
		&channel_old);
		if (ret != 0)
		return ret;

		ret = regmap_read(regmap, MLX90632_RAM_2(channel), &read_tmp);
		if (ret < 0)
		return ret;

		read = (s16)read_tmp;

		ret = regmap_read(regmap, MLX90632_RAM_1(channel), &read_tmp);
		if (ret < 0)
		return ret;
		*object_new_raw = (read + (s16)read_tmp) / 2;

		ret = regmap_read(regmap, MLX90632_RAM_2(channel_old), &read_tmp);
		if (ret < 0)
		return ret;
		read = (s16)read_tmp;

		ret = regmap_read(regmap, MLX90632_RAM_1(channel_old), &read_tmp);
		if (ret < 0)
		return ret;
		*object_old_raw = (read + (s16)read_tmp) / 2;

		return ret;
		}

		static int mlx90632_read_all_channel(struct mlx90632_data *data,
		s16 ambient_new_raw, s16 ambient_old_raw,
		s16 object_new_raw, s16 object_old_raw)
		{
		s32 ret, measurement;

		mutex_lock(&data->lock);
		measurement = mlx90632_perform_measurement(data);
		if (measurement < 0) {
		ret = measurement;
		goto read_unlock;
		}
		ret = mlx90632_read_ambient_raw(data->regmap, ambient_new_raw,
		ambient_old_raw);
		if (ret < 0)
		goto read_unlock;

		ret = mlx90632_read_object_raw(data->regmap, measurement,
		object_new_raw, object_old_raw);
		read_unlock:
		mutex_unlock(&data->lock);
		return ret;
		}

		static int mlx90632_read_ee_register(struct regmap *regmap, u16 reg_lsb,
		s32 *reg_value)
		{
		s32 ret;
		unsigned int read;
		u32 value;

		ret = regmap_read(regmap, reg_lsb, &read);
		if (ret < 0)
		return ret;

		value = read;

		ret = regmap_read(regmap, reg_lsb + 1, &read);
		if (ret < 0)
		return ret;

		*reg_value = (read << 16) \| (value & 0xffff);

		return 0;
		}

		static s64 mlx90632_preprocess_temp_amb(s16 ambient_new_raw,
		s16 ambient_old_raw, s16 Gb)
		{
		s64 VR_Ta, kGb, tmp;

		kGb = ((s64)Gb * 1000LL) >> 10ULL;
		VR_Ta = (s64)ambient_old_raw * 1000000LL +
		kGb * div64_s64(((s64)ambient_new_raw * 1000LL),
		(MLX90632_REF_3));
		tmp = div64_s64(
		div64_s64(((s64)ambient_new_raw * 1000000000000LL),
		(MLX90632_REF_3)), VR_Ta);
		return div64_s64(tmp << 19ULL, 1000LL);
		}

		static s64 mlx90632_preprocess_temp_obj(s16 object_new_raw, s16 object_old_raw,
		s16 ambient_new_raw,
		s16 ambient_old_raw, s16 Ka)
		{
		s64 VR_IR, kKa, tmp;

		kKa = ((s64)Ka * 1000LL) >> 10ULL;
		VR_IR = (s64)ambient_old_raw * 1000000LL +
		kKa * div64_s64(((s64)ambient_new_raw * 1000LL),
		(MLX90632_REF_3));
		tmp = div64_s64(
		div64_s64(((s64)((object_new_raw + object_old_raw) / 2)
		* 1000000000000LL), (MLX90632_REF_12)),
		VR_IR);
		return div64_s64((tmp << 19ULL), 1000LL);
		}

		static s32 mlx90632_calc_temp_ambient(s16 ambient_new_raw, s16 ambient_old_raw,
		s32 P_T, s32 P_R, s32 P_G, s32 P_O,
		s16 Gb)
		{
		s64 Asub, Bsub, Ablock, Bblock, Cblock, AMB, sum;

		AMB = mlx90632_preprocess_temp_amb(ambient_new_raw, ambient_old_raw,
		Gb);
		Asub = ((s64)P_T * 10000000000LL) >> 44ULL;
		Bsub = AMB - (((s64)P_R * 1000LL) >> 8ULL);
		Ablock = Asub * (Bsub * Bsub);
		Bblock = (div64_s64(Bsub * 10000000LL, P_G)) << 20ULL;
		Cblock = ((s64)P_O * 10000000000LL) >> 8ULL;

		sum = div64_s64(Ablock, 1000000LL) + Bblock + Cblock;

		return div64_s64(sum, 10000000LL);
		}

		static s32 mlx90632_calc_temp_object_iteration(s32 prev_object_temp, s64 object,
		s64 TAdut, s32 Fa, s32 Fb,
		s32 Ga, s16 Ha, s16 Hb,
		u16 emissivity)
		{
		s64 calcedKsTO, calcedKsTA, ir_Alpha, TAdut4, Alpha_corr;
		s64 Ha_customer, Hb_customer;

		Ha_customer = ((s64)Ha * 1000000LL) >> 14ULL;
		Hb_customer = ((s64)Hb * 100) >> 10ULL;

		calcedKsTO = ((s64)((s64)Ga * (prev_object_temp - 25 * 1000LL)
		* 1000LL)) >> 36LL;
		calcedKsTA = ((s64)(Fb * (TAdut - 25 * 1000000LL))) >> 36LL;
		Alpha_corr = div64_s64((((s64)(Fa * 10000000000LL) >> 46LL)
		* Ha_customer), 1000LL);
		Alpha_corr = ((s64)(1 1000000LL + calcedKsTO + calcedKsTA));
		Alpha_corr = emissivity * div64_s64(Alpha_corr, 100000LL);
		Alpha_corr = div64_s64(Alpha_corr, 1000LL);
		ir_Alpha = div64_s64((s64)object * 10000000LL, Alpha_corr);
		TAdut4 = (div64_s64(TAdut, 10000LL) + 27315) *
		(div64_s64(TAdut, 10000LL) + 27315) *
		(div64_s64(TAdut, 10000LL) + 27315) *
		(div64_s64(TAdut, 10000LL) + 27315);

		return (int_sqrt64(int_sqrt64(ir_Alpha * 1000000000000LL + TAdut4))
		- 27315 - Hb_customer) * 10;
		}

		static s32 mlx90632_calc_temp_object(s64 object, s64 ambient, s32 Ea, s32 Eb,
		s32 Fa, s32 Fb, s32 Ga, s16 Ha, s16 Hb,
		u16 tmp_emi)
		{
		s64 kTA, kTA0, TAdut;
		s64 temp = 25000;
		s8 i;

		kTA = (Ea * 1000LL) >> 16LL;
		kTA0 = (Eb * 1000LL) >> 8LL;
		TAdut = div64_s64(((ambient - kTA0) * 1000000LL), kTA) + 25 * 1000000LL;

		/* Iterations of calculation as described in datasheet */
		for (i = 0; i < 5; ++i) {
		temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut,
		Fa, Fb, Ga, Ha, Hb,
		tmp_emi);
		}
		return temp;
		}

		static int mlx90632_calc_object_dsp105(struct mlx90632_data data, int val)
		{
		s32 ret;
		s32 Ea, Eb, Fa, Fb, Ga;
		unsigned int read_tmp;
		s16 Ha, Hb, Gb, Ka;
		s16 ambient_new_raw, ambient_old_raw, object_new_raw, object_old_raw;
		s64 object, ambient;

		ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Ea, &Ea);
		if (ret < 0)
		return ret;
		ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Eb, &Eb);
		if (ret < 0)
		return ret;
		ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Fa, &Fa);
		if (ret < 0)
		return ret;
		ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Fb, &Fb);
		if (ret < 0)
		return ret;
		ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Ga, &Ga);
		if (ret < 0)
		return ret;
		ret = regmap_read(data->regmap, MLX90632_EE_Ha, &read_tmp);
		if (ret < 0)
		return ret;
		Ha = (s16)read_tmp;
		ret = regmap_read(data->regmap, MLX90632_EE_Hb, &read_tmp);
		if (ret < 0)
		return ret;
		Hb = (s16)read_tmp;
		ret = regmap_read(data->regmap, MLX90632_EE_Gb, &read_tmp);
		if (ret < 0)
		return ret;
		Gb = (s16)read_tmp;
		ret = regmap_read(data->regmap, MLX90632_EE_Ka, &read_tmp);
		if (ret < 0)
		return ret;
		Ka = (s16)read_tmp;

		ret = mlx90632_read_all_channel(data,
		&ambient_new_raw, &ambient_old_raw,
		&object_new_raw, &object_old_raw);
		if (ret < 0)
		return ret;

		ambient = mlx90632_preprocess_temp_amb(ambient_new_raw,
		ambient_old_raw, Gb);
		object = mlx90632_preprocess_temp_obj(object_new_raw,
		object_old_raw,
		ambient_new_raw,
		ambient_old_raw, Ka);

		*val = mlx90632_calc_temp_object(object, ambient, Ea, Eb, Fa, Fb, Ga,
		Ha, Hb, data->emissivity);
		return 0;
		}

		static int mlx90632_calc_ambient_dsp105(struct mlx90632_data data, int val)
		{
		s32 ret;
		unsigned int read_tmp;
		s32 PT, PR, PG, PO;
		s16 Gb;
		s16 ambient_new_raw, ambient_old_raw;

		ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_R, &PR);
		if (ret < 0)
		return ret;
		ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_G, &PG);
		if (ret < 0)
		return ret;
		ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_T, &PT);
		if (ret < 0)
		return ret;
		ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_O, &PO);
		if (ret < 0)
		return ret;
		ret = regmap_read(data->regmap, MLX90632_EE_Gb, &read_tmp);
		if (ret < 0)
		return ret;
		Gb = (s16)read_tmp;

		ret = mlx90632_read_ambient_raw(data->regmap, &ambient_new_raw,
		&ambient_old_raw);
		*val = mlx90632_calc_temp_ambient(ambient_new_raw, ambient_old_raw,
		PT, PR, PG, PO, Gb);
		return ret;
		}

		static int mlx90632_read_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const channel, int val,
		int *val2, long mask)
		{
		struct mlx90632_data *data = iio_priv(indio_dev);
		int ret;

		switch (mask) {
		case IIO_CHAN_INFO_PROCESSED:
		switch (channel->channel2) {
		case IIO_MOD_TEMP_AMBIENT:
		ret = mlx90632_calc_ambient_dsp105(data, val);
		if (ret < 0)
		return ret;
		return IIO_VAL_INT;
		case IIO_MOD_TEMP_OBJECT:
		ret = mlx90632_calc_object_dsp105(data, val);
		if (ret < 0)
		return ret;
		return IIO_VAL_INT;
		default:
		return -EINVAL;
		}
		case IIO_CHAN_INFO_CALIBEMISSIVITY:
		if (data->emissivity == 1000) {
		*val = 1;
		*val2 = 0;
		} else {
		*val = 0;
		val2 = data->emissivity 1000;
		}
		return IIO_VAL_INT_PLUS_MICRO;

		default:
		return -EINVAL;
		}
		}

		static int mlx90632_write_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const *channel, int val,
		int val2, long mask)
		{
		struct mlx90632_data *data = iio_priv(indio_dev);

		switch (mask) {
		case IIO_CHAN_INFO_CALIBEMISSIVITY:
		/* Confirm we are within 0 and 1.0 */
		if (val < 0 \|\| val2 < 0 \|\| val > 1 \|\|
		(val == 1 && val2 != 0))
		return -EINVAL;
		data->emissivity = val * 1000 + val2 / 1000;
		return 0;
		default:
		return -EINVAL;
		}
		}

		static const struct iio_chan_spec mlx90632_channels[] = {
		{
		.type = IIO_TEMP,
		.modified = 1,
		.channel2 = IIO_MOD_TEMP_AMBIENT,
		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
		},
		{
		.type = IIO_TEMP,
		.modified = 1,
		.channel2 = IIO_MOD_TEMP_OBJECT,
		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) \|
		BIT(IIO_CHAN_INFO_CALIBEMISSIVITY),
		},
		};

		static const struct iio_info mlx90632_info = {
		.read_raw = mlx90632_read_raw,
		.write_raw = mlx90632_write_raw,
		};

		static int mlx90632_sleep(struct mlx90632_data *data)
		{
		regcache_mark_dirty(data->regmap);

		dev_dbg(&data->client->dev, "Requesting sleep");
		return mlx90632_pwr_set_sleep_step(data->regmap);
		}

		static int mlx90632_wakeup(struct mlx90632_data *data)
		{
		int ret;

		ret = regcache_sync(data->regmap);
		if (ret < 0) {
		dev_err(&data->client->dev,
		"Failed to sync regmap registers: %d\n", ret);
		return ret;
		}

		dev_dbg(&data->client->dev, "Requesting wake-up\n");
		return mlx90632_pwr_continuous(data->regmap);
		}

		static int mlx90632_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct iio_dev *indio_dev;
		struct mlx90632_data *mlx90632;
		struct regmap *regmap;
		int ret;
		unsigned int read;

		indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*mlx90632));
		if (!indio_dev) {
		dev_err(&client->dev, "Failed to allocate device\n");
		return -ENOMEM;
		}

		regmap = devm_regmap_init_i2c(client, &mlx90632_regmap);
		if (IS_ERR(regmap)) {
		ret = PTR_ERR(regmap);
		dev_err(&client->dev, "Failed to allocate regmap: %d\n", ret);
		return ret;
		}

		mlx90632 = iio_priv(indio_dev);
		i2c_set_clientdata(client, indio_dev);
		mlx90632->client = client;
		mlx90632->regmap = regmap;

		mutex_init(&mlx90632->lock);
		indio_dev->dev.parent = &client->dev;
		indio_dev->name = id->name;
		indio_dev->modes = INDIO_DIRECT_MODE;
		indio_dev->info = &mlx90632_info;
		indio_dev->channels = mlx90632_channels;
		indio_dev->num_channels = ARRAY_SIZE(mlx90632_channels);

		ret = mlx90632_wakeup(mlx90632);
		if (ret < 0) {
		dev_err(&client->dev, "Wakeup failed: %d\n", ret);
		return ret;
		}

		ret = regmap_read(mlx90632->regmap, MLX90632_EE_VERSION, &read);
		if (ret < 0) {
		dev_err(&client->dev, "read of version failed: %d\n", ret);
		return ret;
		}
		if (read == MLX90632_ID_MEDICAL) {
		dev_dbg(&client->dev,
		"Detected Medical EEPROM calibration %x\n", read);
		} else if (read == MLX90632_ID_CONSUMER) {
		dev_dbg(&client->dev,
		"Detected Consumer EEPROM calibration %x\n", read);
		} else {
		dev_err(&client->dev,
		"EEPROM version mismatch %x (expected %x or %x)\n",
		read, MLX90632_ID_CONSUMER, MLX90632_ID_MEDICAL);
		return -EPROTONOSUPPORT;
		}

		mlx90632->emissivity = 1000;

		pm_runtime_disable(&client->dev);
		ret = pm_runtime_set_active(&client->dev);
		if (ret < 0) {
		mlx90632_sleep(mlx90632);
		return ret;
		}
		pm_runtime_enable(&client->dev);
		pm_runtime_set_autosuspend_delay(&client->dev, MLX90632_SLEEP_DELAY_MS);
		pm_runtime_use_autosuspend(&client->dev);

		return iio_device_register(indio_dev);
		}

		static int mlx90632_remove(struct i2c_client *client)
		{
		struct iio_dev *indio_dev = i2c_get_clientdata(client);
		struct mlx90632_data *data = iio_priv(indio_dev);

		iio_device_unregister(indio_dev);

		pm_runtime_disable(&client->dev);
		pm_runtime_set_suspended(&client->dev);
		pm_runtime_put_noidle(&client->dev);

		mlx90632_sleep(data);

		return 0;
		}

		static const struct i2c_device_id mlx90632_id[] = {
		{ "mlx90632", 0 },
		{ }
		};
		MODULE_DEVICE_TABLE(i2c, mlx90632_id);

		static const struct of_device_id mlx90632_of_match[] = {
		{ .compatible = "melexis,mlx90632" },
		{ }
		};
		MODULE_DEVICE_TABLE(of, mlx90632_of_match);

		static int __maybe_unused mlx90632_pm_suspend(struct device *dev)
		{
		struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
		struct mlx90632_data *data = iio_priv(indio_dev);

		return mlx90632_sleep(data);
		}

		static int __maybe_unused mlx90632_pm_resume(struct device *dev)
		{
		struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
		struct mlx90632_data *data = iio_priv(indio_dev);

		return mlx90632_wakeup(data);
		}

		static UNIVERSAL_DEV_PM_OPS(mlx90632_pm_ops, mlx90632_pm_suspend,
		mlx90632_pm_resume, NULL);

		static struct i2c_driver mlx90632_driver = {
		.driver = {
		.name = "mlx90632",
		.of_match_table = mlx90632_of_match,
		.pm = &mlx90632_pm_ops,
		},
		.probe = mlx90632_probe,
		.remove = mlx90632_remove,
		.id_table = mlx90632_id,
		};
		module_i2c_driver(mlx90632_driver);

		MODULE_AUTHOR("Crt Mori <cmo@melexis.com>");
		MODULE_DESCRIPTION("Melexis MLX90632 contactless Infra Red temperature sensor driver");
		MODULE_LICENSE("GPL v2");