// SPDX-License-Identifier: GPL-2.0 /* * Analog Devices LTC2983 Multi-Sensor Digital Temperature Measurement System * driver * * Copyright 2019 Analog Devices Inc. */ #include <linux/bitfield.h> #include <linux/completion.h> #include <linux/device.h> #include <linux/err.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/iio/iio.h> #include <linux/interrupt.h> #include <linux/list.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/property.h> #include <linux/regmap.h> #include <linux/regulator/consumer.h> #include <linux/spi/spi.h> #include <asm/byteorder.h> #include <linux/unaligned.h> /* register map */ #define LTC2983_STATUS_REG … #define LTC2983_TEMP_RES_START_REG … #define LTC2983_TEMP_RES_END_REG … #define LTC2983_EEPROM_KEY_REG … #define LTC2983_EEPROM_READ_STATUS_REG … #define LTC2983_GLOBAL_CONFIG_REG … #define LTC2983_MULT_CHANNEL_START_REG … #define LTC2983_MULT_CHANNEL_END_REG … #define LTC2986_EEPROM_STATUS_REG … #define LTC2983_MUX_CONFIG_REG … #define LTC2983_CHAN_ASSIGN_START_REG … #define LTC2983_CHAN_ASSIGN_END_REG … #define LTC2983_CUST_SENS_TBL_START_REG … #define LTC2983_CUST_SENS_TBL_END_REG … #define LTC2983_DIFFERENTIAL_CHAN_MIN … #define LTC2983_MIN_CHANNELS_NR … #define LTC2983_SLEEP … #define LTC2983_CUSTOM_STEINHART_SIZE … #define LTC2983_CUSTOM_SENSOR_ENTRY_SZ … #define LTC2983_CUSTOM_STEINHART_ENTRY_SZ … #define LTC2983_EEPROM_KEY … #define LTC2983_EEPROM_WRITE_CMD … #define LTC2983_EEPROM_READ_CMD … #define LTC2983_EEPROM_STATUS_FAILURE_MASK … #define LTC2983_EEPROM_READ_FAILURE_MASK … #define LTC2983_EEPROM_WRITE_TIME_MS … #define LTC2983_EEPROM_READ_TIME_MS … #define LTC2983_CHAN_START_ADDR(chan) … #define LTC2983_CHAN_RES_ADDR(chan) … #define LTC2983_THERMOCOUPLE_DIFF_MASK … #define LTC2983_THERMOCOUPLE_SGL(x) … #define LTC2983_THERMOCOUPLE_OC_CURR_MASK … #define LTC2983_THERMOCOUPLE_OC_CURR(x) … #define LTC2983_THERMOCOUPLE_OC_CHECK_MASK … #define LTC2983_THERMOCOUPLE_OC_CHECK(x) … #define LTC2983_THERMISTOR_DIFF_MASK … #define LTC2983_THERMISTOR_SGL(x) … #define LTC2983_THERMISTOR_R_SHARE_MASK … #define LTC2983_THERMISTOR_R_SHARE(x) … #define LTC2983_THERMISTOR_C_ROTATE_MASK … #define LTC2983_THERMISTOR_C_ROTATE(x) … #define LTC2983_DIODE_DIFF_MASK … #define LTC2983_DIODE_SGL(x) … #define LTC2983_DIODE_3_CONV_CYCLE_MASK … #define LTC2983_DIODE_3_CONV_CYCLE(x) … #define LTC2983_DIODE_AVERAGE_ON_MASK … #define LTC2983_DIODE_AVERAGE_ON(x) … #define LTC2983_RTD_4_WIRE_MASK … #define LTC2983_RTD_ROTATION_MASK … #define LTC2983_RTD_C_ROTATE(x) … #define LTC2983_RTD_KELVIN_R_SENSE_MASK … #define LTC2983_RTD_N_WIRES_MASK … #define LTC2983_RTD_N_WIRES(x) … #define LTC2983_RTD_R_SHARE_MASK … #define LTC2983_RTD_R_SHARE(x) … #define LTC2983_COMMON_HARD_FAULT_MASK … #define LTC2983_COMMON_SOFT_FAULT_MASK … #define LTC2983_STATUS_START_MASK … #define LTC2983_STATUS_START(x) … #define LTC2983_STATUS_UP_MASK … #define LTC2983_STATUS_UP(reg) … #define LTC2983_STATUS_CHAN_SEL_MASK … #define LTC2983_STATUS_CHAN_SEL(x) … #define LTC2983_TEMP_UNITS_MASK … #define LTC2983_TEMP_UNITS(x) … #define LTC2983_NOTCH_FREQ_MASK … #define LTC2983_NOTCH_FREQ(x) … #define LTC2983_RES_VALID_MASK … #define LTC2983_DATA_MASK … #define LTC2983_DATA_SIGN_BIT … #define LTC2983_CHAN_TYPE_MASK … #define LTC2983_CHAN_TYPE(x) … /* cold junction for thermocouples and rsense for rtd's and thermistor's */ #define LTC2983_CHAN_ASSIGN_MASK … #define LTC2983_CHAN_ASSIGN(x) … #define LTC2983_CUSTOM_LEN_MASK … #define LTC2983_CUSTOM_LEN(x) … #define LTC2983_CUSTOM_ADDR_MASK … #define LTC2983_CUSTOM_ADDR(x) … #define LTC2983_THERMOCOUPLE_CFG_MASK … #define LTC2983_THERMOCOUPLE_CFG(x) … #define LTC2983_THERMOCOUPLE_HARD_FAULT_MASK … #define LTC2983_THERMOCOUPLE_SOFT_FAULT_MASK … #define LTC2983_RTD_CFG_MASK … #define LTC2983_RTD_CFG(x) … #define LTC2983_RTD_EXC_CURRENT_MASK … #define LTC2983_RTD_EXC_CURRENT(x) … #define LTC2983_RTD_CURVE_MASK … #define LTC2983_RTD_CURVE(x) … #define LTC2983_THERMISTOR_CFG_MASK … #define LTC2983_THERMISTOR_CFG(x) … #define LTC2983_THERMISTOR_EXC_CURRENT_MASK … #define LTC2983_THERMISTOR_EXC_CURRENT(x) … #define LTC2983_DIODE_CFG_MASK … #define LTC2983_DIODE_CFG(x) … #define LTC2983_DIODE_EXC_CURRENT_MASK … #define LTC2983_DIODE_EXC_CURRENT(x) … #define LTC2983_DIODE_IDEAL_FACTOR_MASK … #define LTC2983_DIODE_IDEAL_FACTOR(x) … #define LTC2983_R_SENSE_VAL_MASK … #define LTC2983_R_SENSE_VAL(x) … #define LTC2983_ADC_SINGLE_ENDED_MASK … #define LTC2983_ADC_SINGLE_ENDED(x) … enum { … }; #define to_thermocouple(_sensor) … #define to_rtd(_sensor) … #define to_thermistor(_sensor) … #define to_diode(_sensor) … #define to_rsense(_sensor) … #define to_adc(_sensor) … #define to_temp(_sensor) … struct ltc2983_chip_info { … }; struct ltc2983_data { … }; struct ltc2983_sensor { … }; struct ltc2983_custom_sensor { … }; struct ltc2983_thermocouple { … }; struct ltc2983_rtd { … }; struct ltc2983_thermistor { … }; struct ltc2983_diode { … }; struct ltc2983_rsense { … }; struct ltc2983_adc { … }; struct ltc2983_temp { … }; /* * Convert to Q format numbers. These number's are integers where * the number of integer and fractional bits are specified. The resolution * is given by 1/@resolution and tell us the number of fractional bits. For * instance a resolution of 2^-10 means we have 10 fractional bits. */ static u32 __convert_to_raw(const u64 val, const u32 resolution) { … } static u32 __convert_to_raw_sign(const u64 val, const u32 resolution) { … } static int __ltc2983_fault_handler(const struct ltc2983_data *st, const u32 result, const u32 hard_mask, const u32 soft_mask) { … } static int __ltc2983_chan_assign_common(struct ltc2983_data *st, const struct ltc2983_sensor *sensor, u32 chan_val) { … } static int __ltc2983_chan_custom_sensor_assign(struct ltc2983_data *st, struct ltc2983_custom_sensor *custom, u32 *chan_val) { … } static struct ltc2983_custom_sensor * __ltc2983_custom_sensor_new(struct ltc2983_data *st, const struct fwnode_handle *fn, const char *propname, const bool is_steinhart, const u32 resolution, const bool has_signed) { … } static int ltc2983_thermocouple_fault_handler(const struct ltc2983_data *st, const u32 result) { … } static int ltc2983_common_fault_handler(const struct ltc2983_data *st, const u32 result) { … } static int ltc2983_thermocouple_assign_chan(struct ltc2983_data *st, const struct ltc2983_sensor *sensor) { … } static int ltc2983_rtd_assign_chan(struct ltc2983_data *st, const struct ltc2983_sensor *sensor) { … } static int ltc2983_thermistor_assign_chan(struct ltc2983_data *st, const struct ltc2983_sensor *sensor) { … } static int ltc2983_diode_assign_chan(struct ltc2983_data *st, const struct ltc2983_sensor *sensor) { … } static int ltc2983_r_sense_assign_chan(struct ltc2983_data *st, const struct ltc2983_sensor *sensor) { … } static int ltc2983_adc_assign_chan(struct ltc2983_data *st, const struct ltc2983_sensor *sensor) { … } static int ltc2983_temp_assign_chan(struct ltc2983_data *st, const struct ltc2983_sensor *sensor) { … } static struct ltc2983_sensor * ltc2983_thermocouple_new(const struct fwnode_handle *child, struct ltc2983_data *st, const struct ltc2983_sensor *sensor) { … } static struct ltc2983_sensor * ltc2983_rtd_new(const struct fwnode_handle *child, struct ltc2983_data *st, const struct ltc2983_sensor *sensor) { … } static struct ltc2983_sensor * ltc2983_thermistor_new(const struct fwnode_handle *child, struct ltc2983_data *st, const struct ltc2983_sensor *sensor) { … } static struct ltc2983_sensor * ltc2983_diode_new(const struct fwnode_handle *child, const struct ltc2983_data *st, const struct ltc2983_sensor *sensor) { … } static struct ltc2983_sensor *ltc2983_r_sense_new(struct fwnode_handle *child, struct ltc2983_data *st, const struct ltc2983_sensor *sensor) { … } static struct ltc2983_sensor *ltc2983_adc_new(struct fwnode_handle *child, struct ltc2983_data *st, const struct ltc2983_sensor *sensor) { … } static struct ltc2983_sensor *ltc2983_temp_new(struct fwnode_handle *child, struct ltc2983_data *st, const struct ltc2983_sensor *sensor) { … } static int ltc2983_chan_read(struct ltc2983_data *st, const struct ltc2983_sensor *sensor, int *val) { … } static int ltc2983_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { … } static int ltc2983_reg_access(struct iio_dev *indio_dev, unsigned int reg, unsigned int writeval, unsigned int *readval) { … } static irqreturn_t ltc2983_irq_handler(int irq, void *data) { … } #define LTC2983_CHAN(__type, index, __address) … static int ltc2983_parse_fw(struct ltc2983_data *st) { … } static int ltc2983_eeprom_cmd(struct ltc2983_data *st, unsigned int cmd, unsigned int wait_time, unsigned int status_reg, unsigned long status_fail_mask) { … } static int ltc2983_setup(struct ltc2983_data *st, bool assign_iio) { … } static const struct regmap_range ltc2983_reg_ranges[] = …; static const struct regmap_access_table ltc2983_reg_table = …; /* * The reg_bits are actually 12 but the device needs the first *complete* * byte for the command (R/W). */ static const struct regmap_config ltc2983_regmap_config = …; static const struct iio_info ltc2983_iio_info = …; static int ltc2983_probe(struct spi_device *spi) { … } static int ltc2983_resume(struct device *dev) { … } static int ltc2983_suspend(struct device *dev) { … } static DEFINE_SIMPLE_DEV_PM_OPS(ltc2983_pm_ops, ltc2983_suspend, ltc2983_resume); static const struct ltc2983_chip_info ltc2983_chip_info_data = …; static const struct ltc2983_chip_info ltc2984_chip_info_data = …; static const struct ltc2983_chip_info ltc2986_chip_info_data = …; static const struct ltc2983_chip_info ltm2985_chip_info_data = …; static const struct spi_device_id ltc2983_id_table[] = …; MODULE_DEVICE_TABLE(spi, ltc2983_id_table); static const struct of_device_id ltc2983_of_match[] = …; MODULE_DEVICE_TABLE(of, ltc2983_of_match); static struct spi_driver ltc2983_driver = …; module_spi_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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