// SPDX-License-Identifier: GPL-2.0 /* ad7949.c - Analog Devices ADC driver 14/16 bits 4/8 channels * * Copyright (C) 2018 CMC NV * * https://www.analog.com/media/en/technical-documentation/data-sheets/AD7949.pdf */ #include <linux/delay.h> #include <linux/iio/iio.h> #include <linux/module.h> #include <linux/regulator/consumer.h> #include <linux/spi/spi.h> #include <linux/bitfield.h> #define AD7949_CFG_MASK_TOTAL … /* CFG: Configuration Update */ #define AD7949_CFG_MASK_OVERWRITE … /* INCC: Input Channel Configuration */ #define AD7949_CFG_MASK_INCC … #define AD7949_CFG_VAL_INCC_UNIPOLAR_GND … #define AD7949_CFG_VAL_INCC_UNIPOLAR_COMM … #define AD7949_CFG_VAL_INCC_UNIPOLAR_DIFF … #define AD7949_CFG_VAL_INCC_TEMP … #define AD7949_CFG_VAL_INCC_BIPOLAR … #define AD7949_CFG_VAL_INCC_BIPOLAR_DIFF … /* INX: Input channel Selection in a binary fashion */ #define AD7949_CFG_MASK_INX … /* BW: select bandwidth for low-pass filter. Full or Quarter */ #define AD7949_CFG_MASK_BW_FULL … /* REF: reference/buffer selection */ #define AD7949_CFG_MASK_REF … #define AD7949_CFG_VAL_REF_EXT_TEMP_BUF … #define AD7949_CFG_VAL_REF_EXT_TEMP … #define AD7949_CFG_VAL_REF_INT_4096 … #define AD7949_CFG_VAL_REF_INT_2500 … #define AD7949_CFG_VAL_REF_EXTERNAL … /* SEQ: channel sequencer. Allows for scanning channels */ #define AD7949_CFG_MASK_SEQ … /* RB: Read back the CFG register */ #define AD7949_CFG_MASK_RBN … enum { … }; struct ad7949_adc_spec { … }; static const struct ad7949_adc_spec ad7949_adc_spec[] = …; /** * struct ad7949_adc_chip - AD ADC chip * @lock: protects write sequences * @vref: regulator generating Vref * @indio_dev: reference to iio structure * @spi: reference to spi structure * @refsel: reference selection * @resolution: resolution of the chip * @cfg: copy of the configuration register * @current_channel: current channel in use * @buffer: buffer to send / receive data to / from device * @buf8b: be16 buffer to exchange data with the device in 8-bit transfers */ struct ad7949_adc_chip { … }; static int ad7949_spi_write_cfg(struct ad7949_adc_chip *ad7949_adc, u16 val, u16 mask) { … } static int ad7949_spi_read_channel(struct ad7949_adc_chip *ad7949_adc, int *val, unsigned int channel) { … } #define AD7949_ADC_CHANNEL(chan) … static const struct iio_chan_spec ad7949_adc_channels[] = …; static int ad7949_spi_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { … } static int ad7949_spi_reg_access(struct iio_dev *indio_dev, unsigned int reg, unsigned int writeval, unsigned int *readval) { … } static const struct iio_info ad7949_spi_info = …; static int ad7949_spi_init(struct ad7949_adc_chip *ad7949_adc) { … } static void ad7949_disable_reg(void *reg) { … } static int ad7949_spi_probe(struct spi_device *spi) { … } static const struct of_device_id ad7949_spi_of_id[] = …; MODULE_DEVICE_TABLE(of, ad7949_spi_of_id); static const struct spi_device_id ad7949_spi_id[] = …; MODULE_DEVICE_TABLE(spi, ad7949_spi_id); static struct spi_driver ad7949_spi_driver = …; module_spi_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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