// SPDX-License-Identifier: GPL-2.0 /* * mlx90635.c - Melexis MLX90635 contactless IR temperature sensor * * Copyright (c) 2023 Melexis <[email protected]> * * Driver for the Melexis MLX90635 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> /* Memory sections addresses */ #define MLX90635_ADDR_RAM … #define MLX90635_ADDR_EEPROM … /* EEPROM addresses - used at startup */ #define MLX90635_EE_I2C_CFG … #define MLX90635_EE_CTRL1 … #define MLX90635_EE_CTRL2 … #define MLX90635_EE_Ha … #define MLX90635_EE_Hb … #define MLX90635_EE_Fa … #define MLX90635_EE_FASCALE … #define MLX90635_EE_Ga … #define MLX90635_EE_Fb … #define MLX90635_EE_Ea … #define MLX90635_EE_Eb … #define MLX90635_EE_P_G … #define MLX90635_EE_P_O … #define MLX90635_EE_Aa … #define MLX90635_EE_VERSION … #define MLX90635_EE_Gb … /* Device status register - volatile */ #define MLX90635_REG_STATUS … #define MLX90635_STAT_BUSY … #define MLX90635_STAT_BRST … #define MLX90635_STAT_CYCLE_POS … #define MLX90635_STAT_END_CONV … #define MLX90635_STAT_DATA_RDY … /* EEPROM control register address - volatile */ #define MLX90635_REG_EE … #define MLX90635_EE_ACTIVE … #define MLX90635_EE_BUSY_MASK … #define MLX90635_REG_CMD … /* Control register1 address - volatile */ #define MLX90635_REG_CTRL1 … #define MLX90635_CTRL1_REFRESH_RATE_MASK … #define MLX90635_CTRL1_RES_CTRL_MASK … #define MLX90635_CTRL1_TABLE_MASK … /* Control register2 address - volatile */ #define MLX90635_REG_CTRL2 … #define MLX90635_CTRL2_BURST_CNT_MASK … #define MLX90635_CTRL2_MODE_MASK … #define MLX90635_CTRL2_SOB_MASK … /* PowerModes statuses */ #define MLX90635_PWR_STATUS_HALT … #define MLX90635_PWR_STATUS_SLEEP_STEP … #define MLX90635_PWR_STATUS_STEP … #define MLX90635_PWR_STATUS_CONTINUOUS … /* Measurement data addresses */ #define MLX90635_RESULT_1 … #define MLX90635_RESULT_2 … #define MLX90635_RESULT_3 … #define MLX90635_RESULT_4 … #define MLX90635_RESULT_5 … /* Timings (ms) */ #define MLX90635_TIMING_RST_MIN … #define MLX90635_TIMING_RST_MAX … #define MLX90635_TIMING_POLLING … #define MLX90635_TIMING_EE_ACTIVE_MIN … #define MLX90635_TIMING_EE_ACTIVE_MAX … /* Magic constants */ #define MLX90635_ID_DSPv1 … #define MLX90635_RESET_CMD … #define MLX90635_MAX_MEAS_NUM … #define MLX90635_PTAT_DIV … #define MLX90635_IR_DIV … #define MLX90635_SLEEP_DELAY_MS … #define MLX90635_MEAS_MAX_TIME … #define MLX90635_READ_RETRIES … #define MLX90635_VERSION_MASK … #define MLX90635_DSP_VERSION(reg) … #define MLX90635_DSP_FIXED … /** * struct mlx90635_data - private data for the MLX90635 device * @client: I2C client of the device * @lock: Internal mutex because multiple reads are needed for single triggered * measurement to ensure data consistency * @regmap: Regmap of the device registers * @regmap_ee: Regmap of the device EEPROM which can be cached * @emissivity: Object emissivity from 0 to 1000 where 1000 = 1 * @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 mlx90635_data { … }; static const struct regmap_range mlx90635_volatile_reg_range[] = …; static const struct regmap_access_table mlx90635_volatile_regs_tbl = …; static const struct regmap_range mlx90635_read_reg_range[] = …; static const struct regmap_access_table mlx90635_readable_regs_tbl = …; static const struct regmap_range mlx90635_no_write_reg_range[] = …; static const struct regmap_access_table mlx90635_writeable_regs_tbl = …; static const struct regmap_config mlx90635_regmap = …; static const struct regmap_range mlx90635_read_ee_range[] = …; static const struct regmap_access_table mlx90635_readable_ees_tbl = …; static const struct regmap_range mlx90635_no_write_ee_range[] = …; static const struct regmap_access_table mlx90635_writeable_ees_tbl = …; static const struct regmap_config mlx90635_regmap_ee = …; /** * mlx90635_reset_delay() - Give the mlx90635 some time to reset properly * If this is not done, the following I2C command(s) will not be accepted. */ static void mlx90635_reset_delay(void) { … } static int mlx90635_pwr_sleep_step(struct mlx90635_data *data) { … } static int mlx90635_pwr_continuous(struct mlx90635_data *data) { … } static int mlx90635_read_ee_register(struct regmap *regmap, u16 reg_lsb, s32 *reg_value) { … } static int mlx90635_read_ee_ambient(struct regmap *regmap, s16 *PG, s16 *PO, s16 *Gb) { … } static int mlx90635_read_ee_object(struct regmap *regmap, u32 *Ea, u32 *Eb, u32 *Fa, s16 *Fb, s16 *Ga, s16 *Gb, s16 *Ha, s16 *Hb, u16 *Fa_scale) { … } static int mlx90635_calculate_dataset_ready_time(struct mlx90635_data *data, int *refresh_time) { … } static int mlx90635_perform_measurement_burst(struct mlx90635_data *data) { … } static int mlx90635_read_ambient_raw(struct regmap *regmap, s16 *ambient_new_raw, s16 *ambient_old_raw) { … } static int mlx90635_read_object_raw(struct regmap *regmap, s16 *object_raw) { … } static int mlx90635_read_all_channel(struct mlx90635_data *data, s16 *ambient_new_raw, s16 *ambient_old_raw, s16 *object_raw) { … } static s64 mlx90635_preprocess_temp_amb(s16 ambient_new_raw, s16 ambient_old_raw, s16 Gb) { … } static s64 mlx90635_preprocess_temp_obj(s16 object_raw, s16 ambient_new_raw, s16 ambient_old_raw, s16 Gb) { … } static s32 mlx90635_calc_temp_ambient(s16 ambient_new_raw, s16 ambient_old_raw, u16 P_G, u16 P_O, s16 Gb) { … } static s32 mlx90635_calc_temp_object_iteration(s32 prev_object_temp, s64 object, s64 TAdut, s64 TAdut4, s16 Ga, u32 Fa, u16 Fa_scale, s16 Fb, s16 Ha, s16 Hb, u16 emissivity) { … } static s64 mlx90635_calc_ta4(s64 TAdut, s64 scale) { … } static s32 mlx90635_calc_temp_object(s64 object, s64 ambient, u32 Ea, u32 Eb, s16 Ga, u32 Fa, u16 Fa_scale, s16 Fb, s16 Ha, s16 Hb, u16 tmp_emi) { … } static int mlx90635_calc_object(struct mlx90635_data *data, int *val) { … } static int mlx90635_calc_ambient(struct mlx90635_data *data, int *val) { … } static int mlx90635_get_refresh_rate(struct mlx90635_data *data, unsigned int *refresh_rate) { … } static const struct { … } mlx90635_freqs[] = …; /** * mlx90635_pm_interaction_wakeup() - Measure time between user interactions to change powermode * @data: pointer to mlx90635_data object containing interaction_ts information * * Switch to continuous mode when interaction is faster than MLX90635_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 mlx90635_pm_interaction_wakeup(struct mlx90635_data *data) { … } static int mlx90635_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *channel, int *val, int *val2, long mask) { … } static int mlx90635_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *channel, int val, int val2, long mask) { … } static int mlx90635_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, const int **vals, int *type, int *length, long mask) { … } static const struct iio_chan_spec mlx90635_channels[] = …; static const struct iio_info mlx90635_info = …; static void mlx90635_sleep(void *_data) { … } static int mlx90635_suspend(struct mlx90635_data *data) { … } static int mlx90635_wakeup(struct mlx90635_data *data) { … } static void mlx90635_disable_regulator(void *_data) { … } static int mlx90635_enable_regulator(struct mlx90635_data *data) { … } static int mlx90635_probe(struct i2c_client *client) { … } static const struct i2c_device_id mlx90635_id[] = …; MODULE_DEVICE_TABLE(i2c, mlx90635_id); static const struct of_device_id mlx90635_of_match[] = …; MODULE_DEVICE_TABLE(of, mlx90635_of_match); static int mlx90635_pm_suspend(struct device *dev) { … } static int mlx90635_pm_resume(struct device *dev) { … } static int mlx90635_pm_runtime_suspend(struct device *dev) { … } static const struct dev_pm_ops mlx90635_pm_ops = …; static struct i2c_driver mlx90635_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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