[v3,1/3] iio: temperature: Adding support for MLX90632
diff mbox

Message ID 20171206095454.8150-1-cmo@melexis.com
State New
Headers show

Commit Message

Crt Mori Dec. 6, 2017, 9:54 a.m. UTC
Melexis has just released Infra Red temperature sensor MLX90632 used
for contact-less temperature measurement. Driver provides basic
functionality for reporting object (and ambient) temperature with
support for object emissivity.

Signed-off-by: Crt Mori <cmo@melexis.com>
---
 MAINTAINERS                        |   7 +
 drivers/iio/temperature/Kconfig    |  12 +
 drivers/iio/temperature/Makefile   |   1 +
 drivers/iio/temperature/mlx90632.c | 787 +++++++++++++++++++++++++++++++++++++
 4 files changed, 807 insertions(+)
 create mode 100644 drivers/iio/temperature/mlx90632.c

Comments

Jonathan Cameron Dec. 10, 2017, 7:43 p.m. UTC | #1
On Wed,  6 Dec 2017 10:54:54 +0100
Crt Mori <cmo@melexis.com> wrote:

> Melexis has just released Infra Red temperature sensor MLX90632 used
> for contact-less temperature measurement. Driver provides basic
> functionality for reporting object (and ambient) temperature with
> support for object emissivity.
> 
> Signed-off-by: Crt Mori <cmo@melexis.com>
Sorry for my rant / review earlier - thought I was looking at V3. oops ;)

Anyhow, much better.  A few of the comments from there still apply though
and I'm out of time to port them over to this version today, so I hope
you don't mind fishing them out of that review.

Jonathan
> ---
>  MAINTAINERS                        |   7 +
>  drivers/iio/temperature/Kconfig    |  12 +
>  drivers/iio/temperature/Makefile   |   1 +
>  drivers/iio/temperature/mlx90632.c | 787 +++++++++++++++++++++++++++++++++++++
>  4 files changed, 807 insertions(+)
>  create mode 100644 drivers/iio/temperature/mlx90632.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 2d3d750b19c0..81aec02b08b8 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -8690,6 +8690,13 @@ 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
> diff --git a/drivers/iio/temperature/Kconfig b/drivers/iio/temperature/Kconfig
> index 5378976d6d27..82e4a62745e2 100644
> --- a/drivers/iio/temperature/Kconfig
> +++ b/drivers/iio/temperature/Kconfig
> @@ -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
> diff --git a/drivers/iio/temperature/Makefile b/drivers/iio/temperature/Makefile
> index ad1d668de546..44644fe01bc9 100644
> --- a/drivers/iio/temperature/Makefile
> +++ b/drivers/iio/temperature/Makefile
> @@ -5,6 +5,7 @@
>  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
> diff --git a/drivers/iio/temperature/mlx90632.c b/drivers/iio/temperature/mlx90632.c
> new file mode 100644
> index 000000000000..74c23b69f9dc
> --- /dev/null
> +++ b/drivers/iio/temperature/mlx90632.c
> @@ -0,0 +1,787 @@
> +/*
> + * mlx90632.c - Melexis MLX90632 contactless IR temperature sensor
> + *
> + * Copyright (c) 2017 Melexis <cmo@melexis.com>
> + *
> + * This file is subject to the terms and conditions of version 2 of
> + * the GNU General Public License.  See the file COPYING in the main
> + * directory of this archive for more details.
> + *
> + * 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_EEPROM_VERSION	0xff05 /* EEPROM DSP version for constants */
> +#define MLX90632_ID_MEDICAL	0x01ff /* EEPROM Medical device id */
> +#define MLX90632_ID_CONSUMER	0x02ff /* EEPROM Consumer device id */
> +#define MLX90632_EEPROM_WRITE_KEY 0x554C /* EEPROM write key 0x55 and 0x4c */
> +#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 */
> +
> +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_CONTROL, MLX90632_REG_I2C_ADDR),
> +	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_CONTROL, MLX90632_REG_I2C_ADDR),
> +	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,
> +};
> +
> +#ifdef CONFIG_PM
> +static int mlx90632_sleep(struct mlx90632_data *data)
> +{
> +	dev_dbg(&data->client->dev, "Requesting sleep");
> +	return mlx90632_pwr_set_sleep_step(data->regmap);
> +}
> +
> +static int mlx90632_wakeup(struct mlx90632_data *data)
> +{
> +	dev_dbg(&data->client->dev, "Requesting wake-up");
> +	return mlx90632_pwr_continuous(data->regmap);
> +}
> +#endif
> +
> +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");
> +		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);
> +	mlx90632_wakeup(mlx90632);
> +
> +	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 = regmap_read(mlx90632->regmap, MLX90632_EE_VERSION, &read);
> +	if (ret < 0) {
> +		dev_err(&client->dev, "read of version failed: %d\n", ret);
> +		return ret;
> +	}
> +	/* Higher 8 bits are ID, lower 8 bits are EEPROM_VERSION */
> +	if (read == (MLX90632_EEPROM_VERSION & MLX90632_ID_MEDICAL)) {
> +		dev_dbg(&client->dev,
> +			"Detected Medical EEPROM calibration %x", read);
> +	} else if (read == (MLX90632_EEPROM_VERSION & MLX90632_ID_CONSUMER)) {
> +		dev_dbg(&client->dev,
> +			"Detected Consumer EEPROM calibration %x", read);
> +	} else {
> +		dev_err(&client->dev,
> +			"Chip EEPROM version mismatch %x (expected %x)",
> +			read, MLX90632_EEPROM_VERSION);
> +		return -EPROTONOSUPPORT;
> +	}
> +
> +	mlx90632->emissivity = 1000;
> +
> +	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);
> +	if (!pm_runtime_status_suspended(&client->dev))
> +		mlx90632_sleep(data);
> +	pm_runtime_set_suspended(&client->dev);
> +
> +	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);
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int 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);
> +
> +	regcache_sync(data->regmap);
> +
> +	if (pm_runtime_active(dev))
> +		return mlx90632_sleep(data);
> +
> +	return 0;
> +}
> +
> +static int 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);
> +	int err;
> +
> +	regcache_mark_dirty(data->regmap);
> +	regcache_cache_only(data->regmap, false);
> +	err = regcache_sync(data->regmap);
> +	if (err < 0) {
> +		dev_err(dev, "Failed to sync regmap registers: %d\n", err);
> +		return err;
> +	}
> +
> +	err = mlx90632_wakeup(data);
> +	if (err < 0)
> +		return err;
> +
> +	pm_runtime_disable(dev);
> +	pm_runtime_set_active(dev);
> +	pm_runtime_enable(dev);
> +
> +	return 0;
> +}
> +#endif
> +
> +#ifdef CONFIG_PM
> +static int mlx90632_pm_runtime_suspend(struct device *dev)
> +{
> +	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> +	struct mlx90632_data *mlx90632 = iio_priv(indio_dev);
> +
> +	regcache_sync(mlx90632->regmap);
> +
> +	return mlx90632_sleep(mlx90632);
> +}
> +
> +static int mlx90632_pm_runtime_resume(struct device *dev)
> +{
> +	s32 ret;
> +	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> +	struct mlx90632_data *mlx90632 = iio_priv(indio_dev);
> +
> +	regcache_mark_dirty(mlx90632->regmap);
> +	regcache_cache_only(mlx90632->regmap, false);
> +	ret = regcache_sync(mlx90632->regmap);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to sync regmap registers: %d\n", ret);
> +		return ret;
> +	}
> +
> +	return mlx90632_wakeup(mlx90632);
> +}
> +#endif
> +
> +static const struct dev_pm_ops mlx90632_pm_ops = {
> +	SET_SYSTEM_SLEEP_PM_OPS(mlx90632_pm_suspend, mlx90632_pm_resume)
> +	SET_RUNTIME_PM_OPS(mlx90632_pm_runtime_suspend,
> +			   mlx90632_pm_runtime_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");

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Crt Mori Dec. 11, 2017, 9:18 a.m. UTC | #2
Hi Jonathan,
I have adjusted per your request even other remaining bits. I hope pm
is now looking as it should.

Thanks for noticing that there is no register in the datasheet
(sometimes internal knowledge gets in the way of such things).

I have reordered patches as well (details in cover letter). I think v4
should be final, so make sure you review it ;)

Best regards,
Crt

On 10 December 2017 at 20:43, Jonathan Cameron <jic23@kernel.org> wrote:
> On Wed,  6 Dec 2017 10:54:54 +0100
> Crt Mori <cmo@melexis.com> wrote:
>
>> Melexis has just released Infra Red temperature sensor MLX90632 used
>> for contact-less temperature measurement. Driver provides basic
>> functionality for reporting object (and ambient) temperature with
>> support for object emissivity.
>>
>> Signed-off-by: Crt Mori <cmo@melexis.com>
> Sorry for my rant / review earlier - thought I was looking at V3. oops ;)
>
> Anyhow, much better.  A few of the comments from there still apply though
> and I'm out of time to port them over to this version today, so I hope
> you don't mind fishing them out of that review.
>
> Jonathan
>> ---
>>  MAINTAINERS                        |   7 +
>>  drivers/iio/temperature/Kconfig    |  12 +
>>  drivers/iio/temperature/Makefile   |   1 +
>>  drivers/iio/temperature/mlx90632.c | 787 +++++++++++++++++++++++++++++++++++++
>>  4 files changed, 807 insertions(+)
>>  create mode 100644 drivers/iio/temperature/mlx90632.c
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 2d3d750b19c0..81aec02b08b8 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -8690,6 +8690,13 @@ 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
>> diff --git a/drivers/iio/temperature/Kconfig b/drivers/iio/temperature/Kconfig
>> index 5378976d6d27..82e4a62745e2 100644
>> --- a/drivers/iio/temperature/Kconfig
>> +++ b/drivers/iio/temperature/Kconfig
>> @@ -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
>> diff --git a/drivers/iio/temperature/Makefile b/drivers/iio/temperature/Makefile
>> index ad1d668de546..44644fe01bc9 100644
>> --- a/drivers/iio/temperature/Makefile
>> +++ b/drivers/iio/temperature/Makefile
>> @@ -5,6 +5,7 @@
>>  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
>> diff --git a/drivers/iio/temperature/mlx90632.c b/drivers/iio/temperature/mlx90632.c
>> new file mode 100644
>> index 000000000000..74c23b69f9dc
>> --- /dev/null
>> +++ b/drivers/iio/temperature/mlx90632.c
>> @@ -0,0 +1,787 @@
>> +/*
>> + * mlx90632.c - Melexis MLX90632 contactless IR temperature sensor
>> + *
>> + * Copyright (c) 2017 Melexis <cmo@melexis.com>
>> + *
>> + * This file is subject to the terms and conditions of version 2 of
>> + * the GNU General Public License.  See the file COPYING in the main
>> + * directory of this archive for more details.
>> + *
>> + * 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_EEPROM_VERSION      0xff05 /* EEPROM DSP version for constants */
>> +#define MLX90632_ID_MEDICAL  0x01ff /* EEPROM Medical device id */
>> +#define MLX90632_ID_CONSUMER 0x02ff /* EEPROM Consumer device id */
>> +#define MLX90632_EEPROM_WRITE_KEY 0x554C /* EEPROM write key 0x55 and 0x4c */
>> +#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 */
>> +
>> +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_CONTROL, MLX90632_REG_I2C_ADDR),
>> +     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_CONTROL, MLX90632_REG_I2C_ADDR),
>> +     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,
>> +};
>> +
>> +#ifdef CONFIG_PM
>> +static int mlx90632_sleep(struct mlx90632_data *data)
>> +{
>> +     dev_dbg(&data->client->dev, "Requesting sleep");
>> +     return mlx90632_pwr_set_sleep_step(data->regmap);
>> +}
>> +
>> +static int mlx90632_wakeup(struct mlx90632_data *data)
>> +{
>> +     dev_dbg(&data->client->dev, "Requesting wake-up");
>> +     return mlx90632_pwr_continuous(data->regmap);
>> +}
>> +#endif
>> +
>> +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");
>> +             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);
>> +     mlx90632_wakeup(mlx90632);
>> +
>> +     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 = regmap_read(mlx90632->regmap, MLX90632_EE_VERSION, &read);
>> +     if (ret < 0) {
>> +             dev_err(&client->dev, "read of version failed: %d\n", ret);
>> +             return ret;
>> +     }
>> +     /* Higher 8 bits are ID, lower 8 bits are EEPROM_VERSION */
>> +     if (read == (MLX90632_EEPROM_VERSION & MLX90632_ID_MEDICAL)) {
>> +             dev_dbg(&client->dev,
>> +                     "Detected Medical EEPROM calibration %x", read);
>> +     } else if (read == (MLX90632_EEPROM_VERSION & MLX90632_ID_CONSUMER)) {
>> +             dev_dbg(&client->dev,
>> +                     "Detected Consumer EEPROM calibration %x", read);
>> +     } else {
>> +             dev_err(&client->dev,
>> +                     "Chip EEPROM version mismatch %x (expected %x)",
>> +                     read, MLX90632_EEPROM_VERSION);
>> +             return -EPROTONOSUPPORT;
>> +     }
>> +
>> +     mlx90632->emissivity = 1000;
>> +
>> +     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);
>> +     if (!pm_runtime_status_suspended(&client->dev))
>> +             mlx90632_sleep(data);
>> +     pm_runtime_set_suspended(&client->dev);
>> +
>> +     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);
>> +
>> +#ifdef CONFIG_PM_SLEEP
>> +static int 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);
>> +
>> +     regcache_sync(data->regmap);
>> +
>> +     if (pm_runtime_active(dev))
>> +             return mlx90632_sleep(data);
>> +
>> +     return 0;
>> +}
>> +
>> +static int 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);
>> +     int err;
>> +
>> +     regcache_mark_dirty(data->regmap);
>> +     regcache_cache_only(data->regmap, false);
>> +     err = regcache_sync(data->regmap);
>> +     if (err < 0) {
>> +             dev_err(dev, "Failed to sync regmap registers: %d\n", err);
>> +             return err;
>> +     }
>> +
>> +     err = mlx90632_wakeup(data);
>> +     if (err < 0)
>> +             return err;
>> +
>> +     pm_runtime_disable(dev);
>> +     pm_runtime_set_active(dev);
>> +     pm_runtime_enable(dev);
>> +
>> +     return 0;
>> +}
>> +#endif
>> +
>> +#ifdef CONFIG_PM
>> +static int mlx90632_pm_runtime_suspend(struct device *dev)
>> +{
>> +     struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
>> +     struct mlx90632_data *mlx90632 = iio_priv(indio_dev);
>> +
>> +     regcache_sync(mlx90632->regmap);
>> +
>> +     return mlx90632_sleep(mlx90632);
>> +}
>> +
>> +static int mlx90632_pm_runtime_resume(struct device *dev)
>> +{
>> +     s32 ret;
>> +     struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
>> +     struct mlx90632_data *mlx90632 = iio_priv(indio_dev);
>> +
>> +     regcache_mark_dirty(mlx90632->regmap);
>> +     regcache_cache_only(mlx90632->regmap, false);
>> +     ret = regcache_sync(mlx90632->regmap);
>> +     if (ret < 0) {
>> +             dev_err(dev, "Failed to sync regmap registers: %d\n", ret);
>> +             return ret;
>> +     }
>> +
>> +     return mlx90632_wakeup(mlx90632);
>> +}
>> +#endif
>> +
>> +static const struct dev_pm_ops mlx90632_pm_ops = {
>> +     SET_SYSTEM_SLEEP_PM_OPS(mlx90632_pm_suspend, mlx90632_pm_resume)
>> +     SET_RUNTIME_PM_OPS(mlx90632_pm_runtime_suspend,
>> +                        mlx90632_pm_runtime_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");
>
--
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Patch
diff mbox

diff --git a/MAINTAINERS b/MAINTAINERS
index 2d3d750b19c0..81aec02b08b8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8690,6 +8690,13 @@  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
diff --git a/drivers/iio/temperature/Kconfig b/drivers/iio/temperature/Kconfig
index 5378976d6d27..82e4a62745e2 100644
--- a/drivers/iio/temperature/Kconfig
+++ b/drivers/iio/temperature/Kconfig
@@ -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
diff --git a/drivers/iio/temperature/Makefile b/drivers/iio/temperature/Makefile
index ad1d668de546..44644fe01bc9 100644
--- a/drivers/iio/temperature/Makefile
+++ b/drivers/iio/temperature/Makefile
@@ -5,6 +5,7 @@ 
 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
diff --git a/drivers/iio/temperature/mlx90632.c b/drivers/iio/temperature/mlx90632.c
new file mode 100644
index 000000000000..74c23b69f9dc
--- /dev/null
+++ b/drivers/iio/temperature/mlx90632.c
@@ -0,0 +1,787 @@ 
+/*
+ * mlx90632.c - Melexis MLX90632 contactless IR temperature sensor
+ *
+ * Copyright (c) 2017 Melexis <cmo@melexis.com>
+ *
+ * This file is subject to the terms and conditions of version 2 of
+ * the GNU General Public License.  See the file COPYING in the main
+ * directory of this archive for more details.
+ *
+ * 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_EEPROM_VERSION	0xff05 /* EEPROM DSP version for constants */
+#define MLX90632_ID_MEDICAL	0x01ff /* EEPROM Medical device id */
+#define MLX90632_ID_CONSUMER	0x02ff /* EEPROM Consumer device id */
+#define MLX90632_EEPROM_WRITE_KEY 0x554C /* EEPROM write key 0x55 and 0x4c */
+#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 */
+
+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_CONTROL, MLX90632_REG_I2C_ADDR),
+	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_CONTROL, MLX90632_REG_I2C_ADDR),
+	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,
+};
+
+#ifdef CONFIG_PM
+static int mlx90632_sleep(struct mlx90632_data *data)
+{
+	dev_dbg(&data->client->dev, "Requesting sleep");
+	return mlx90632_pwr_set_sleep_step(data->regmap);
+}
+
+static int mlx90632_wakeup(struct mlx90632_data *data)
+{
+	dev_dbg(&data->client->dev, "Requesting wake-up");
+	return mlx90632_pwr_continuous(data->regmap);
+}
+#endif
+
+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");
+		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);
+	mlx90632_wakeup(mlx90632);
+
+	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 = regmap_read(mlx90632->regmap, MLX90632_EE_VERSION, &read);
+	if (ret < 0) {
+		dev_err(&client->dev, "read of version failed: %d\n", ret);
+		return ret;
+	}
+	/* Higher 8 bits are ID, lower 8 bits are EEPROM_VERSION */
+	if (read == (MLX90632_EEPROM_VERSION & MLX90632_ID_MEDICAL)) {
+		dev_dbg(&client->dev,
+			"Detected Medical EEPROM calibration %x", read);
+	} else if (read == (MLX90632_EEPROM_VERSION & MLX90632_ID_CONSUMER)) {
+		dev_dbg(&client->dev,
+			"Detected Consumer EEPROM calibration %x", read);
+	} else {
+		dev_err(&client->dev,
+			"Chip EEPROM version mismatch %x (expected %x)",
+			read, MLX90632_EEPROM_VERSION);
+		return -EPROTONOSUPPORT;
+	}
+
+	mlx90632->emissivity = 1000;
+
+	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);
+	if (!pm_runtime_status_suspended(&client->dev))
+		mlx90632_sleep(data);
+	pm_runtime_set_suspended(&client->dev);
+
+	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);
+
+#ifdef CONFIG_PM_SLEEP
+static int 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);
+
+	regcache_sync(data->regmap);
+
+	if (pm_runtime_active(dev))
+		return mlx90632_sleep(data);
+
+	return 0;
+}
+
+static int 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);
+	int err;
+
+	regcache_mark_dirty(data->regmap);
+	regcache_cache_only(data->regmap, false);
+	err = regcache_sync(data->regmap);
+	if (err < 0) {
+		dev_err(dev, "Failed to sync regmap registers: %d\n", err);
+		return err;
+	}
+
+	err = mlx90632_wakeup(data);
+	if (err < 0)
+		return err;
+
+	pm_runtime_disable(dev);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
+	return 0;
+}
+#endif
+
+#ifdef CONFIG_PM
+static int mlx90632_pm_runtime_suspend(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct mlx90632_data *mlx90632 = iio_priv(indio_dev);
+
+	regcache_sync(mlx90632->regmap);
+
+	return mlx90632_sleep(mlx90632);
+}
+
+static int mlx90632_pm_runtime_resume(struct device *dev)
+{
+	s32 ret;
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct mlx90632_data *mlx90632 = iio_priv(indio_dev);
+
+	regcache_mark_dirty(mlx90632->regmap);
+	regcache_cache_only(mlx90632->regmap, false);
+	ret = regcache_sync(mlx90632->regmap);
+	if (ret < 0) {
+		dev_err(dev, "Failed to sync regmap registers: %d\n", ret);
+		return ret;
+	}
+
+	return mlx90632_wakeup(mlx90632);
+}
+#endif
+
+static const struct dev_pm_ops mlx90632_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(mlx90632_pm_suspend, mlx90632_pm_resume)
+	SET_RUNTIME_PM_OPS(mlx90632_pm_runtime_suspend,
+			   mlx90632_pm_runtime_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");