drivers/iio/temperature/mlx90632.c

root/drivers/iio/temperature/mlx90632.c
// 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/bitfield.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/iopoll.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/limits.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/math64.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.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 */

#define MLX90632_EE_MEDICAL_MEAS1      0x24E1 /* Medical measurement 1 16bit */
#define MLX90632_EE_MEDICAL_MEAS2      0x24E2 /* Medical measurement 2 16bit */
#define MLX90632_EE_EXTENDED_MEAS1     0x24F1 /* Extended measurement 1 16bit */
#define MLX90632_EE_EXTENDED_MEAS2     0x24F2 /* Extended measurement 2 16bit */
#define MLX90632_EE_EXTENDED_MEAS3     0x24F3 /* Extended measurement 3 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 */
#define   MLX90632_CFG_MTYP_MASK                GENMASK(8, 4) /* Meas select Mask */
#define   MLX90632_CFG_SOB_MASK BIT(11)

/* 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 */

#define MLX90632_EE_RR GENMASK(10, 8) /* Only Refresh Rate bits */
#define MLX90632_REFRESH_RATE(ee_val) FIELD_GET(MLX90632_EE_RR, ee_val)
                                        /* Extract Refresh Rate from ee register */
#define MLX90632_REFRESH_RATE_STATUS(refresh_rate) (refresh_rate << 8)

/* Measurement types */
#define MLX90632_MTYP_MEDICAL 0
#define MLX90632_MTYP_EXTENDED 17

/* Measurement type select*/
#define MLX90632_MTYP_STATUS(ctrl_val) (ctrl_val << 4)
#define MLX90632_MTYP_STATUS_MEDICAL MLX90632_MTYP_STATUS(MLX90632_MTYP_MEDICAL)
#define MLX90632_MTYP_STATUS_EXTENDED MLX90632_MTYP_STATUS(MLX90632_MTYP_EXTENDED)

/* I2C command register - volatile */
#define MLX90632_REG_I2C_CMD    0x3005 /* I2C command Register address */

/* 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)

/* Name important RAM_MEAS channels */
#define MLX90632_RAM_DSP5_EXTENDED_AMBIENT_1 MLX90632_RAM_3(17)
#define MLX90632_RAM_DSP5_EXTENDED_AMBIENT_2 MLX90632_RAM_3(18)
#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_1 MLX90632_RAM_1(17)
#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_2 MLX90632_RAM_2(17)
#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_3 MLX90632_RAM_1(18)
#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_4 MLX90632_RAM_2(18)
#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_5 MLX90632_RAM_1(19)
#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_6 MLX90632_RAM_2(19)

/* Magic constants */
#define MLX90632_ID_MEDICAL     0x0105 /* EEPROM DSPv5 Medical device id */
#define MLX90632_ID_CONSUMER    0x0205 /* EEPROM DSPv5 Consumer device id */
#define MLX90632_ID_EXTENDED    0x0505 /* EEPROM DSPv5 Extended range device id */
#define MLX90632_ID_MASK        GENMASK(14, 0) /* DSP version and device ID in EE_VERSION */
#define MLX90632_DSP_VERSION    5 /* DSP version */
#define MLX90632_DSP_MASK       GENMASK(7, 0) /* DSP version in EE_VERSION */
#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 6000 /* Autosleep delay */
#define MLX90632_EXTENDED_LIMIT 27000 /* Extended mode raw value limit */
#define MLX90632_MEAS_MAX_TIME 2000 /* Max measurement time in ms for the lowest refresh rate */

/**
 * struct mlx90632_data - private data for the MLX90632 device
 * @client: I2C client of the device
 * @lock: Internal mutex for multiple reads for single measurement
 * @regmap: Regmap of the device
 * @emissivity: Object emissivity from 0 to 1000 where 1000 = 1.
 * @mtyp: Measurement type physical sensor configuration for extended range
 *        calculations
 * @object_ambient_temperature: Ambient temperature at object (might differ of
 *                              the ambient temperature of sensor.
 * @regulator: Regulator of the device
 * @powerstatus: Current POWER status of the device
 * @interaction_ts: Timestamp of the last temperature read that is used
 *                  for power management in jiffies
 */
struct mlx90632_data {
        struct i2c_client *client;
        struct mutex lock;
        struct regmap *regmap;
        u16 emissivity;
        u8 mtyp;
        u32 object_ambient_temperature;
        struct regulator *regulator;
        int powerstatus;
        unsigned long interaction_ts;
};

static const struct regmap_range mlx90632_volatile_reg_range[] = {
        regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL),
        regmap_reg_range(MLX90632_REG_I2C_CMD, MLX90632_REG_I2C_CMD),
        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_EE_MEDICAL_MEAS1, MLX90632_EE_MEDICAL_MEAS2),
        regmap_reg_range(MLX90632_EE_EXTENDED_MEAS1, MLX90632_EE_EXTENDED_MEAS3),
        regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL),
        regmap_reg_range(MLX90632_REG_I2C_CMD, MLX90632_REG_I2C_CMD),
        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_read = true,
        .use_single_write = true,
        .reg_format_endian = REGMAP_ENDIAN_BIG,
        .val_format_endian = REGMAP_ENDIAN_BIG,
        .cache_type = REGCACHE_RBTREE,
};

static int mlx90632_pwr_set_sleep_step(struct regmap *regmap)
{
        struct mlx90632_data *data =
                iio_priv(dev_get_drvdata(regmap_get_device(regmap)));
        int ret;

        if (data->powerstatus == MLX90632_PWR_STATUS_SLEEP_STEP)
                return 0;

        ret = regmap_write_bits(regmap, MLX90632_REG_CONTROL, MLX90632_CFG_PWR_MASK,
                                MLX90632_PWR_STATUS_SLEEP_STEP);
        if (ret < 0)
                return ret;

        data->powerstatus = MLX90632_PWR_STATUS_SLEEP_STEP;
        return 0;
}

static int mlx90632_pwr_continuous(struct regmap *regmap)
{
        struct mlx90632_data *data =
                iio_priv(dev_get_drvdata(regmap_get_device(regmap)));
        int ret;

        if (data->powerstatus == MLX90632_PWR_STATUS_CONTINUOUS)
                return 0;

        ret = regmap_write_bits(regmap, MLX90632_REG_CONTROL, MLX90632_CFG_PWR_MASK,
                                MLX90632_PWR_STATUS_CONTINUOUS);
        if (ret < 0)
                return ret;

        data->powerstatus = MLX90632_PWR_STATUS_CONTINUOUS;
        return 0;
}

/**
 * mlx90632_reset_delay() - Give the mlx90632 some time to reset properly
 * If this is not done, the following I2C command(s) will not be accepted.
 */
static void mlx90632_reset_delay(void)
{
        usleep_range(150, 200);
}

static int mlx90632_get_measurement_time(struct regmap *regmap, u16 meas)
{
        unsigned int reg;
        int ret;

        ret = regmap_read(regmap, meas, &reg);
        if (ret < 0)
                return ret;

        return MLX90632_MEAS_MAX_TIME >> FIELD_GET(MLX90632_EE_RR, reg);
}

static int mlx90632_calculate_dataset_ready_time(struct mlx90632_data *data)
{
        unsigned int refresh_time;
        int ret;

        if (data->mtyp == MLX90632_MTYP_MEDICAL) {
                ret = mlx90632_get_measurement_time(data->regmap,
                                                    MLX90632_EE_MEDICAL_MEAS1);
                if (ret < 0)
                        return ret;

                refresh_time = ret;

                ret = mlx90632_get_measurement_time(data->regmap,
                                                    MLX90632_EE_MEDICAL_MEAS2);
                if (ret < 0)
                        return ret;

                refresh_time += ret;
        } else {
                ret = mlx90632_get_measurement_time(data->regmap,
                                                    MLX90632_EE_EXTENDED_MEAS1);
                if (ret < 0)
                        return ret;

                refresh_time = ret;

                ret = mlx90632_get_measurement_time(data->regmap,
                                                    MLX90632_EE_EXTENDED_MEAS2);
                if (ret < 0)
                        return ret;

                refresh_time += ret;

                ret = mlx90632_get_measurement_time(data->regmap,
                                                    MLX90632_EE_EXTENDED_MEAS3);
                if (ret < 0)
                        return ret;

                refresh_time += ret;
        }

        return refresh_time;
}

/**
 * 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)
{
        unsigned int reg_status;
        int ret;

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

        ret = regmap_read_poll_timeout(data->regmap, MLX90632_REG_STATUS, reg_status,
                                       !(reg_status & MLX90632_STAT_DATA_RDY), 10000,
                                       100 * 10000);

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

        return (reg_status & MLX90632_STAT_CYCLE_POS) >> 2;
}

/**
 * mlx90632_perform_measurement_burst() - Trigger and retrieve current measurement
 * cycle in step sleep mode
 * @data: pointer to mlx90632_data object containing regmap information
 *
 * Perform a measurement and return 2 as measurement cycle position reported
 * by sensor. This is a blocking function for amount dependent on the sensor
 * refresh rate.
 */
static int mlx90632_perform_measurement_burst(struct mlx90632_data *data)
{
        unsigned int reg_status;
        int ret;

        ret = regmap_write_bits(data->regmap, MLX90632_REG_CONTROL,
                                MLX90632_CFG_SOB_MASK, MLX90632_CFG_SOB_MASK);
        if (ret < 0)
                return ret;

        ret = mlx90632_calculate_dataset_ready_time(data);
        if (ret < 0)
                return ret;

        msleep(ret); /* Wait minimum time for dataset to be ready */

        ret = regmap_read_poll_timeout(data->regmap, MLX90632_REG_STATUS,
                                       reg_status,
                                       (reg_status & MLX90632_STAT_BUSY) == 0,
                                       10000, 100 * 10000);
        if (ret < 0) {
                dev_err(&data->client->dev, "data not ready");
                return -ETIMEDOUT;
        }

        return 2;
}

static int mlx90632_set_meas_type(struct mlx90632_data *data, u8 type)
{
        int current_powerstatus;
        int ret;

        if (data->mtyp == type)
                return 0;

        current_powerstatus = data->powerstatus;
        ret = mlx90632_pwr_continuous(data->regmap);
        if (ret < 0)
                return ret;

        ret = regmap_write(data->regmap, MLX90632_REG_I2C_CMD, MLX90632_RESET_CMD);
        if (ret < 0)
                return ret;

        mlx90632_reset_delay();

        ret = regmap_update_bits(data->regmap, MLX90632_REG_CONTROL,
                                 (MLX90632_CFG_MTYP_MASK | MLX90632_CFG_PWR_MASK),
                                 (MLX90632_MTYP_STATUS(type) | MLX90632_PWR_STATUS_HALT));
        if (ret < 0)
                return ret;

        data->mtyp = type;
        data->powerstatus = MLX90632_PWR_STATUS_HALT;

        if (current_powerstatus == MLX90632_PWR_STATUS_SLEEP_STEP)
                return mlx90632_pwr_set_sleep_step(data->regmap);

        return mlx90632_pwr_continuous(data->regmap);
}

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 -ECHRNG;
        }

        return 0;
}

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

        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)
{
        unsigned int read_tmp;
        u8 channel_old = 0;
        u8 channel = 0;
        s16 read;
        int ret;

        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 measurement;
        int ret;

        mutex_lock(&data->lock);
        ret = mlx90632_set_meas_type(data, MLX90632_MTYP_MEDICAL);
        if (ret < 0)
                goto read_unlock;

        switch (data->powerstatus) {
        case MLX90632_PWR_STATUS_CONTINUOUS:
                ret = mlx90632_perform_measurement(data);
                if (ret < 0)
                        goto read_unlock;

                break;
        case MLX90632_PWR_STATUS_SLEEP_STEP:
                ret = mlx90632_perform_measurement_burst(data);
                if (ret < 0)
                        goto read_unlock;

                break;
        default:
                ret = -EOPNOTSUPP;
                goto read_unlock;
        }

        measurement = ret; /* If we came here ret holds the measurement position */

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

        ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_AMBIENT_1, &read_tmp);
        if (ret < 0)
                return ret;
        *ambient_new_raw = (s16)read_tmp;

        ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_AMBIENT_2, &read_tmp);
        if (ret < 0)
                return ret;
        *ambient_old_raw = (s16)read_tmp;

        return 0;
}

static int mlx90632_read_object_raw_extended(struct regmap *regmap, s16 *object_new_raw)
{
        unsigned int read_tmp;
        s32 read;
        int ret;

        ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_1, &read_tmp);
        if (ret < 0)
                return ret;
        read = (s16)read_tmp;

        ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_2, &read_tmp);
        if (ret < 0)
                return ret;
        read = read - (s16)read_tmp;

        ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_3, &read_tmp);
        if (ret < 0)
                return ret;
        read = read - (s16)read_tmp;

        ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_4, &read_tmp);
        if (ret < 0)
                return ret;
        read = (read + (s16)read_tmp) / 2;

        ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_5, &read_tmp);
        if (ret < 0)
                return ret;
        read = read + (s16)read_tmp;

        ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_6, &read_tmp);
        if (ret < 0)
                return ret;
        read = read + (s16)read_tmp;

        if (read > S16_MAX || read < S16_MIN)
                return -ERANGE;

        *object_new_raw = read;

        return 0;
}

static int mlx90632_read_all_channel_extended(struct mlx90632_data *data, s16 *object_new_raw,
                                              s16 *ambient_new_raw, s16 *ambient_old_raw)
{
        s32 ret, meas;

        mutex_lock(&data->lock);
        ret = mlx90632_set_meas_type(data, MLX90632_MTYP_EXTENDED);
        if (ret < 0)
                goto read_unlock;

        switch (data->powerstatus) {
        case MLX90632_PWR_STATUS_CONTINUOUS:
                ret = read_poll_timeout(mlx90632_perform_measurement, meas, meas == 19,
                                        50000, 800000, false, data);
                if (ret)
                        goto read_unlock;
                break;
        case MLX90632_PWR_STATUS_SLEEP_STEP:
                ret = mlx90632_perform_measurement_burst(data);
                if (ret < 0)
                        goto read_unlock;
                break;
        default:
                ret = -EOPNOTSUPP;
                goto read_unlock;
        }

        ret = mlx90632_read_object_raw_extended(data->regmap, object_new_raw);
        if (ret < 0)
                goto read_unlock;

        ret = mlx90632_read_ambient_raw_extended(data->regmap, ambient_new_raw, ambient_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)
{
        unsigned int read;
        u32 value;
        int ret;

        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 s64 mlx90632_preprocess_temp_obj_extended(s16 object_new_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 * 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, s64 TAdut4, s32 Fa, s32 Fb,
                                               s32 Ga, s16 Ha, s16 Hb,
                                               u16 emissivity)
{
        s64 calcedKsTO, calcedKsTA, ir_Alpha, 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);

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

static s64 mlx90632_calc_ta4(s64 TAdut, s64 scale)
{
        return (div64_s64(TAdut, scale) + 27315) *
                (div64_s64(TAdut, scale) + 27315) *
                (div64_s64(TAdut, scale) + 27315) *
                (div64_s64(TAdut, scale) + 27315);
}

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, TAdut4;
        s64 temp = 25000;
        s8 i;

        kTA = (Ea * 1000LL) >> 16LL;
        kTA0 = (Eb * 1000LL) >> 8LL;
        TAdut = div64_s64(((ambient - kTA0) * 1000000LL), kTA) + 25 * 1000000LL;
        TAdut4 = mlx90632_calc_ta4(TAdut, 10000LL);

        /* Iterations of calculation as described in datasheet */
        for (i = 0; i < 5; ++i) {
                temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut, TAdut4,
                                                           Fa, Fb, Ga, Ha, Hb,
                                                           tmp_emi);
        }
        return temp;
}

static s32 mlx90632_calc_temp_object_extended(s64 object, s64 ambient, s64 reflected,
                                              s32 Ea, s32 Eb, s32 Fa, s32 Fb, s32 Ga,
                                              s16 Ha, s16 Hb, u16 tmp_emi)
{
        s64 kTA, kTA0, TAdut, TAdut4, Tr4, TaTr4;
        s64 temp = 25000;
        s8 i;

        kTA = (Ea * 1000LL) >> 16LL;
        kTA0 = (Eb * 1000LL) >> 8LL;
        TAdut = div64_s64((ambient - kTA0) * 1000000LL, kTA) + 25 * 1000000LL;
        Tr4 = mlx90632_calc_ta4(reflected, 10);
        TAdut4 = mlx90632_calc_ta4(TAdut, 10000LL);
        TaTr4 = Tr4 - div64_s64(Tr4 - TAdut4, tmp_emi) * 1000;

        /* Iterations of calculation as described in datasheet */
        for (i = 0; i < 5; ++i) {
                temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut, TaTr4,
                                                           Fa / 2, Fb, Ga, Ha, Hb,
                                                           tmp_emi);
        }

        return temp;
}

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

        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;

        if (object_new_raw > MLX90632_EXTENDED_LIMIT &&
            data->mtyp == MLX90632_MTYP_EXTENDED) {
                ret = mlx90632_read_all_channel_extended(data, &object_new_raw,
                                                         &ambient_new_raw, &ambient_old_raw);
                if (ret < 0)
                        return ret;

                /* Use extended mode calculations */
                ambient = mlx90632_preprocess_temp_amb(ambient_new_raw,
                                                       ambient_old_raw, Gb);
                object = mlx90632_preprocess_temp_obj_extended(object_new_raw,
                                                               ambient_new_raw,
                                                               ambient_old_raw, Ka);
                *val = mlx90632_calc_temp_object_extended(object, ambient,
                                                          data->object_ambient_temperature,
                                                          Ea, Eb, Fa, Fb, Ga,
                                                          Ha, Hb, data->emissivity);
                return 0;
        }

        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)
{
        s16 ambient_new_raw, ambient_old_raw;
        unsigned int read_tmp;
        s32 PT, PR, PG, PO;
        int ret;
        s16 Gb;

        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);
        if (ret < 0)
                return ret;
        *val = mlx90632_calc_temp_ambient(ambient_new_raw, ambient_old_raw,
                                          PT, PR, PG, PO, Gb);
        return ret;
}

static int mlx90632_get_refresh_rate(struct mlx90632_data *data,
                                     int *refresh_rate)
{
        unsigned int meas1;
        int ret;

        ret = regmap_read(data->regmap, MLX90632_EE_MEDICAL_MEAS1, &meas1);
        if (ret < 0)
                return ret;

        *refresh_rate = MLX90632_REFRESH_RATE(meas1);

        return ret;
}

static const int mlx90632_freqs[][2] = {
        {0, 500000},
        {1, 0},
        {2, 0},
        {4, 0},
        {8, 0},
        {16, 0},
        {32, 0},
        {64, 0}
};

/**
 * mlx90632_pm_interraction_wakeup() - Measure time between user interactions to change powermode
 * @data: pointer to mlx90632_data object containing interaction_ts information
 *
 * Switch to continuous mode when interaction is faster than MLX90632_MEAS_MAX_TIME. Update the
 * interaction_ts for each function call with the jiffies to enable measurement between function
 * calls. Initial value of the interaction_ts needs to be set before this function call.
 */
static int mlx90632_pm_interraction_wakeup(struct mlx90632_data *data)
{
        unsigned long now;
        int ret;

        now = jiffies;
        if (time_in_range(now, data->interaction_ts,
                          data->interaction_ts +
                          msecs_to_jiffies(MLX90632_MEAS_MAX_TIME + 100))) {
                if (data->powerstatus == MLX90632_PWR_STATUS_SLEEP_STEP) {
                        ret = mlx90632_pwr_continuous(data->regmap);
                        if (ret < 0)
                                return ret;
                }
        }

        data->interaction_ts = now;

        return 0;
}

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;
        int cr;

        pm_runtime_get_sync(&data->client->dev);
        ret = mlx90632_pm_interraction_wakeup(data);
        if (ret < 0)
                goto mlx90632_read_raw_pm;

        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)
                                goto mlx90632_read_raw_pm;

                        ret = IIO_VAL_INT;
                        break;
                case IIO_MOD_TEMP_OBJECT:
                        ret = mlx90632_calc_object_dsp105(data, val);
                        if (ret < 0)
                                goto mlx90632_read_raw_pm;

                        ret = IIO_VAL_INT;
                        break;
                default:
                        ret = -EINVAL;
                        break;
                }
                break;
        case IIO_CHAN_INFO_CALIBEMISSIVITY:
                if (data->emissivity == 1000) {
                        *val = 1;
                        *val2 = 0;
                } else {
                        *val = 0;
                        *val2 = data->emissivity * 1000;
                }
                ret = IIO_VAL_INT_PLUS_MICRO;
                break;
        case IIO_CHAN_INFO_CALIBAMBIENT:
                *val = data->object_ambient_temperature;
                ret = IIO_VAL_INT;
                break;
        case IIO_CHAN_INFO_SAMP_FREQ:
                ret = mlx90632_get_refresh_rate(data, &cr);
                if (ret < 0)
                        goto mlx90632_read_raw_pm;

                *val = mlx90632_freqs[cr][0];
                *val2 = mlx90632_freqs[cr][1];
                ret = IIO_VAL_INT_PLUS_MICRO;
                break;
        default:
                ret = -EINVAL;
                break;
        }

mlx90632_read_raw_pm:
        pm_runtime_put_autosuspend(&data->client->dev);
        return ret;
}

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;
        case IIO_CHAN_INFO_CALIBAMBIENT:
                data->object_ambient_temperature = val;
                return 0;
        default:
                return -EINVAL;
        }
}

static int mlx90632_read_avail(struct iio_dev *indio_dev,
                               struct iio_chan_spec const *chan,
                               const int **vals, int *type, int *length,
                               long mask)
{
        switch (mask) {
        case IIO_CHAN_INFO_SAMP_FREQ:
                *vals = (int *)mlx90632_freqs;
                *type = IIO_VAL_INT_PLUS_MICRO;
                *length = 2 * ARRAY_SIZE(mlx90632_freqs);
                return IIO_AVAIL_LIST;
        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),
                .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
                .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_SAMP_FREQ),
        },
        {
                .type = IIO_TEMP,
                .modified = 1,
                .channel2 = IIO_MOD_TEMP_OBJECT,
                .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
                        BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) | BIT(IIO_CHAN_INFO_CALIBAMBIENT),
                .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
                .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_SAMP_FREQ),
        },
};

static const struct iio_info mlx90632_info = {
        .read_raw = mlx90632_read_raw,
        .write_raw = mlx90632_write_raw,
        .read_avail = mlx90632_read_avail,
};

static void mlx90632_sleep(void *_data)
{
        struct mlx90632_data *data = _data;

        mlx90632_pwr_set_sleep_step(data->regmap);
}

static int mlx90632_suspend(struct mlx90632_data *data)
{
        regcache_mark_dirty(data->regmap);

        dev_dbg(&data->client->dev, "Requesting suspend");
        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 void mlx90632_disable_regulator(void *_data)
{
        struct mlx90632_data *data = _data;
        int ret;

        ret = regulator_disable(data->regulator);
        if (ret < 0)
                dev_err(regmap_get_device(data->regmap),
                        "Failed to disable power regulator: %d\n", ret);
}

static int mlx90632_enable_regulator(struct mlx90632_data *data)
{
        int ret;

        ret = regulator_enable(data->regulator);
        if (ret < 0) {
                dev_err(regmap_get_device(data->regmap), "Failed to enable power regulator!\n");
                return ret;
        }

        mlx90632_reset_delay();

        return ret;
}

static int mlx90632_probe(struct i2c_client *client)
{
        const struct i2c_device_id *id = i2c_client_get_device_id(client);
        struct mlx90632_data *mlx90632;
        struct iio_dev *indio_dev;
        struct regmap *regmap;
        unsigned int read;
        int ret;

        indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*mlx90632));
        if (!indio_dev)
                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;
        mlx90632->mtyp = MLX90632_MTYP_MEDICAL;
        mlx90632->powerstatus = MLX90632_PWR_STATUS_HALT;

        mutex_init(&mlx90632->lock);
        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);

        mlx90632->regulator = devm_regulator_get(&client->dev, "vdd");
        if (IS_ERR(mlx90632->regulator))
                return dev_err_probe(&client->dev, PTR_ERR(mlx90632->regulator),
                                     "failed to get vdd regulator");

        ret = mlx90632_enable_regulator(mlx90632);
        if (ret < 0)
                return ret;

        ret = devm_add_action_or_reset(&client->dev, mlx90632_disable_regulator,
                                       mlx90632);
        if (ret < 0) {
                dev_err(&client->dev, "Failed to setup regulator cleanup action %d\n",
                        ret);
                return ret;
        }

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

        ret = devm_add_action_or_reset(&client->dev, mlx90632_sleep, mlx90632);
        if (ret < 0) {
                dev_err(&client->dev, "Failed to setup low power cleanup action %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;
        }
        read = read & MLX90632_ID_MASK;
        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 if (read == MLX90632_ID_EXTENDED) {
                dev_dbg(&client->dev,
                        "Detected Extended range EEPROM calibration %x\n", read);
                mlx90632->mtyp = MLX90632_MTYP_EXTENDED;
        } else if ((read & MLX90632_DSP_MASK) == MLX90632_DSP_VERSION) {
                dev_dbg(&client->dev,
                        "Detected Unknown EEPROM calibration %x\n", read);
        } else {
                dev_err(&client->dev,
                        "Wrong DSP version %x (expected %x)\n",
                        read, MLX90632_DSP_VERSION);
                return -EPROTONOSUPPORT;
        }

        mlx90632->emissivity = 1000;
        mlx90632->object_ambient_temperature = 25000; /* 25 degrees milliCelsius */
        mlx90632->interaction_ts = jiffies; /* Set initial value */

        pm_runtime_get_noresume(&client->dev);
        pm_runtime_set_active(&client->dev);

        ret = devm_pm_runtime_enable(&client->dev);
        if (ret)
                return ret;

        pm_runtime_set_autosuspend_delay(&client->dev, MLX90632_SLEEP_DELAY_MS);
        pm_runtime_use_autosuspend(&client->dev);
        pm_runtime_put_autosuspend(&client->dev);

        return devm_iio_device_register(&client->dev, indio_dev);
}

static const struct i2c_device_id mlx90632_id[] = {
        { "mlx90632" },
        { }
};
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 mlx90632_pm_suspend(struct device *dev)
{
        struct mlx90632_data *data = iio_priv(dev_get_drvdata(dev));
        int ret;

        ret = mlx90632_suspend(data);
        if (ret < 0)
                return ret;

        ret = regulator_disable(data->regulator);
        if (ret < 0)
                dev_err(regmap_get_device(data->regmap),
                        "Failed to disable power regulator: %d\n", ret);

        return ret;
}

static int mlx90632_pm_resume(struct device *dev)
{
        struct mlx90632_data *data = iio_priv(dev_get_drvdata(dev));
        int ret;

        ret = mlx90632_enable_regulator(data);
        if (ret < 0)
                return ret;

        return mlx90632_wakeup(data);
}

static int mlx90632_pm_runtime_suspend(struct device *dev)
{
        struct mlx90632_data *data = iio_priv(dev_get_drvdata(dev));

        return mlx90632_pwr_set_sleep_step(data->regmap);
}

static const struct dev_pm_ops mlx90632_pm_ops = {
        SYSTEM_SLEEP_PM_OPS(mlx90632_pm_suspend, mlx90632_pm_resume)
        RUNTIME_PM_OPS(mlx90632_pm_runtime_suspend, NULL, NULL)
};

static struct i2c_driver mlx90632_driver = {
        .driver = {
                .name   = "mlx90632",
                .of_match_table = mlx90632_of_match,
                .pm     = pm_ptr(&mlx90632_pm_ops),
        },
        .probe = mlx90632_probe,
        .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");
Linux
