// SPDX-License-Identifier: GPL-2.0 /* * AD5758 Digital to analog converters driver * * Copyright 2018 Analog Devices Inc. * * TODO: Currently CRC is not supported in this driver */ #include <linux/bsearch.h> #include <linux/delay.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/property.h> #include <linux/spi/spi.h> #include <linux/gpio/consumer.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> /* AD5758 registers definition */ #define AD5758_NOP … #define AD5758_DAC_INPUT … #define AD5758_DAC_OUTPUT … #define AD5758_CLEAR_CODE … #define AD5758_USER_GAIN … #define AD5758_USER_OFFSET … #define AD5758_DAC_CONFIG … #define AD5758_SW_LDAC … #define AD5758_KEY … #define AD5758_GP_CONFIG1 … #define AD5758_GP_CONFIG2 … #define AD5758_DCDC_CONFIG1 … #define AD5758_DCDC_CONFIG2 … #define AD5758_WDT_CONFIG … #define AD5758_DIGITAL_DIAG_CONFIG … #define AD5758_ADC_CONFIG … #define AD5758_FAULT_PIN_CONFIG … #define AD5758_TWO_STAGE_READBACK_SELECT … #define AD5758_DIGITAL_DIAG_RESULTS … #define AD5758_ANALOG_DIAG_RESULTS … #define AD5758_STATUS … #define AD5758_CHIP_ID … #define AD5758_FREQ_MONITOR … #define AD5758_DEVICE_ID_0 … #define AD5758_DEVICE_ID_1 … #define AD5758_DEVICE_ID_2 … #define AD5758_DEVICE_ID_3 … /* AD5758_DAC_CONFIG */ #define AD5758_DAC_CONFIG_RANGE_MSK … #define AD5758_DAC_CONFIG_RANGE_MODE(x) … #define AD5758_DAC_CONFIG_INT_EN_MSK … #define AD5758_DAC_CONFIG_INT_EN_MODE(x) … #define AD5758_DAC_CONFIG_OUT_EN_MSK … #define AD5758_DAC_CONFIG_OUT_EN_MODE(x) … #define AD5758_DAC_CONFIG_SR_EN_MSK … #define AD5758_DAC_CONFIG_SR_EN_MODE(x) … #define AD5758_DAC_CONFIG_SR_CLOCK_MSK … #define AD5758_DAC_CONFIG_SR_CLOCK_MODE(x) … #define AD5758_DAC_CONFIG_SR_STEP_MSK … #define AD5758_DAC_CONFIG_SR_STEP_MODE(x) … /* AD5758_KEY */ #define AD5758_KEY_CODE_RESET_1 … #define AD5758_KEY_CODE_RESET_2 … #define AD5758_KEY_CODE_SINGLE_ADC_CONV … #define AD5758_KEY_CODE_RESET_WDT … #define AD5758_KEY_CODE_CALIB_MEM_REFRESH … /* AD5758_DCDC_CONFIG1 */ #define AD5758_DCDC_CONFIG1_DCDC_VPROG_MSK … #define AD5758_DCDC_CONFIG1_DCDC_VPROG_MODE(x) … #define AD5758_DCDC_CONFIG1_DCDC_MODE_MSK … #define AD5758_DCDC_CONFIG1_DCDC_MODE_MODE(x) … /* AD5758_DCDC_CONFIG2 */ #define AD5758_DCDC_CONFIG2_ILIMIT_MSK … #define AD5758_DCDC_CONFIG2_ILIMIT_MODE(x) … #define AD5758_DCDC_CONFIG2_INTR_SAT_3WI_MSK … #define AD5758_DCDC_CONFIG2_BUSY_3WI_MSK … /* AD5758_DIGITAL_DIAG_RESULTS */ #define AD5758_CAL_MEM_UNREFRESHED_MSK … /* AD5758_ADC_CONFIG */ #define AD5758_ADC_CONFIG_PPC_BUF_EN(x) … #define AD5758_ADC_CONFIG_PPC_BUF_MSK … #define AD5758_WR_FLAG_MSK(x) … #define AD5758_FULL_SCALE_MICRO … struct ad5758_range { … }; /** * struct ad5758_state - driver instance specific data * @spi: spi_device * @lock: mutex lock * @gpio_reset: gpio descriptor for the reset line * @out_range: struct which stores the output range * @dc_dc_mode: variable which stores the mode of operation * @dc_dc_ilim: variable which stores the dc-to-dc converter current limit * @slew_time: variable which stores the target slew time * @pwr_down: variable which contains whether a channel is powered down or not * @d32: spi transfer buffers */ struct ad5758_state { … }; /* * Output ranges corresponding to bits [3:0] from DAC_CONFIG register * 0000: 0 V to 5 V voltage range * 0001: 0 V to 10 V voltage range * 0010: ±5 V voltage range * 0011: ±10 V voltage range * 1000: 0 mA to 20 mA current range * 1001: 0 mA to 24 mA current range * 1010: 4 mA to 20 mA current range * 1011: ±20 mA current range * 1100: ±24 mA current range * 1101: -1 mA to +22 mA current range */ enum ad5758_output_range { … }; enum ad5758_dc_dc_mode { … }; static const struct ad5758_range ad5758_voltage_range[] = …; static const struct ad5758_range ad5758_current_range[] = …; static const int ad5758_sr_clk[16] = …; static const int ad5758_sr_step[8] = …; static const int ad5758_dc_dc_ilim[6] = …; static int ad5758_spi_reg_read(struct ad5758_state *st, unsigned int addr) { … } static int ad5758_spi_reg_write(struct ad5758_state *st, unsigned int addr, unsigned int val) { … } static int ad5758_spi_write_mask(struct ad5758_state *st, unsigned int addr, unsigned long int mask, unsigned int val) { … } static int cmpfunc(const void *a, const void *b) { … } static int ad5758_find_closest_match(const int *array, unsigned int size, int val) { … } static int ad5758_wait_for_task_complete(struct ad5758_state *st, unsigned int reg, unsigned int mask) { … } static int ad5758_calib_mem_refresh(struct ad5758_state *st) { … } static int ad5758_soft_reset(struct ad5758_state *st) { … } static int ad5758_set_dc_dc_conv_mode(struct ad5758_state *st, enum ad5758_dc_dc_mode mode) { … } static int ad5758_set_dc_dc_ilim(struct ad5758_state *st, unsigned int ilim) { … } static int ad5758_slew_rate_set(struct ad5758_state *st, unsigned int sr_clk_idx, unsigned int sr_step_idx) { … } static int ad5758_slew_rate_config(struct ad5758_state *st) { … } static int ad5758_set_out_range(struct ad5758_state *st, int range) { … } static int ad5758_internal_buffers_en(struct ad5758_state *st, bool enable) { … } static int ad5758_reset(struct ad5758_state *st) { … } static int ad5758_reg_access(struct iio_dev *indio_dev, unsigned int reg, unsigned int writeval, unsigned int *readval) { … } static int ad5758_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long info) { … } static int ad5758_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long info) { … } static ssize_t ad5758_read_powerdown(struct iio_dev *indio_dev, uintptr_t priv, const struct iio_chan_spec *chan, char *buf) { … } static ssize_t ad5758_write_powerdown(struct iio_dev *indio_dev, uintptr_t priv, struct iio_chan_spec const *chan, const char *buf, size_t len) { … } static const struct iio_info ad5758_info = …; static const struct iio_chan_spec_ext_info ad5758_ext_info[] = …; #define AD5758_DAC_CHAN(_chan_type) … static const struct iio_chan_spec ad5758_voltage_ch[] = …; static const struct iio_chan_spec ad5758_current_ch[] = …; static bool ad5758_is_valid_mode(enum ad5758_dc_dc_mode mode) { … } static int ad5758_crc_disable(struct ad5758_state *st) { … } static int ad5758_find_out_range(struct ad5758_state *st, const struct ad5758_range *range, unsigned int size, int min, int max) { … } static int ad5758_parse_dt(struct ad5758_state *st) { … } static int ad5758_init(struct ad5758_state *st) { … } static int ad5758_probe(struct spi_device *spi) { … } static const struct spi_device_id ad5758_id[] = …; MODULE_DEVICE_TABLE(spi, ad5758_id); static const struct of_device_id ad5758_of_match[] = …; MODULE_DEVICE_TABLE(of, ad5758_of_match); static struct spi_driver ad5758_driver = …; module_spi_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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