// SPDX-License-Identifier: GPL-2.0-only /* * Analog Devices AD5766, AD5767 * Digital to Analog Converters driver * Copyright 2019-2020 Analog Devices Inc. */ #include <linux/bitfield.h> #include <linux/bitops.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/gpio/consumer.h> #include <linux/iio/iio.h> #include <linux/iio/triggered_buffer.h> #include <linux/iio/trigger_consumer.h> #include <linux/module.h> #include <linux/spi/spi.h> #include <asm/unaligned.h> #define AD5766_UPPER_WORD_SPI_MASK … #define AD5766_LOWER_WORD_SPI_MASK … #define AD5766_DITHER_SOURCE_MASK(ch) … #define AD5766_DITHER_SOURCE(ch, source) … #define AD5766_DITHER_SCALE_MASK(x) … #define AD5766_DITHER_SCALE(ch, scale) … #define AD5766_DITHER_ENABLE_MASK(ch) … #define AD5766_DITHER_ENABLE(ch, state) … #define AD5766_DITHER_INVERT_MASK(ch) … #define AD5766_DITHER_INVERT(ch, state) … #define AD5766_CMD_NOP_MUX_OUT … #define AD5766_CMD_SDO_CNTRL … #define AD5766_CMD_WR_IN_REG(x) … #define AD5766_CMD_WR_DAC_REG(x) … #define AD5766_CMD_SW_LDAC … #define AD5766_CMD_SPAN_REG … #define AD5766_CMD_WR_PWR_DITHER … #define AD5766_CMD_WR_DAC_REG_ALL … #define AD5766_CMD_SW_FULL_RESET … #define AD5766_CMD_READBACK_REG(x) … #define AD5766_CMD_DITHER_SIG_1 … #define AD5766_CMD_DITHER_SIG_2 … #define AD5766_CMD_INV_DITHER … #define AD5766_CMD_DITHER_SCALE_1 … #define AD5766_CMD_DITHER_SCALE_2 … #define AD5766_FULL_RESET_CODE … enum ad5766_type { … }; enum ad5766_voltage_range { … }; /** * struct ad5766_chip_info - chip specific information * @num_channels: number of channels * @channels: channel specification */ struct ad5766_chip_info { … }; enum { … }; /* * Dither signal can also be scaled. * Available dither scale strings corresponding to "dither_scale" field in * "struct ad5766_state". */ static const char * const ad5766_dither_scales[] = …; /** * struct ad5766_state - driver instance specific data * @spi: SPI device * @lock: Lock used to restrict concurrent access to SPI device * @chip_info: Chip model specific constants * @gpio_reset: Reset GPIO, used to reset the device * @crt_range: Current selected output range * @dither_enable: Power enable bit for each channel dither block (for * example, D15 = DAC 15,D8 = DAC 8, and D0 = DAC 0) * 0 - Normal operation, 1 - Power down * @dither_invert: Inverts the dither signal applied to the selected DAC * outputs * @dither_source: Selects between 2 possible sources: * 1: N0, 2: N1 * Two bits are used for each channel * @dither_scale: Two bits are used for each of the 16 channels: * 0: 1 SCALING, 1: 0.75 SCALING, 2: 0.5 SCALING, * 3: 0.25 SCALING. * @data: SPI transfer buffers */ struct ad5766_state { … }; struct ad5766_span_tbl { … }; static const struct ad5766_span_tbl ad5766_span_tbl[] = …; static int __ad5766_spi_read(struct ad5766_state *st, u8 dac, int *val) { … } static int __ad5766_spi_write(struct ad5766_state *st, u8 command, u16 data) { … } static int ad5766_read(struct iio_dev *indio_dev, u8 dac, int *val) { … } static int ad5766_write(struct iio_dev *indio_dev, u8 dac, u16 data) { … } static int ad5766_reset(struct ad5766_state *st) { … } static int ad5766_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long m) { … } static int ad5766_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long info) { … } static const struct iio_info ad5766_info = …; static int ad5766_get_dither_source(struct iio_dev *dev, const struct iio_chan_spec *chan) { … } static int ad5766_set_dither_source(struct iio_dev *dev, const struct iio_chan_spec *chan, unsigned int source) { … } static int ad5766_get_dither_scale(struct iio_dev *dev, const struct iio_chan_spec *chan) { … } static int ad5766_set_dither_scale(struct iio_dev *dev, const struct iio_chan_spec *chan, unsigned int scale) { … } static const struct iio_enum ad5766_dither_scale_enum = …; static ssize_t ad5766_read_ext(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, char *buf) { … } static ssize_t ad5766_write_ext(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, const char *buf, size_t len) { … } #define _AD5766_CHAN_EXT_INFO(_name, _what, _shared) … static const struct iio_chan_spec_ext_info ad5766_ext_info[] = …; #define AD576x_CHANNEL(_chan, _bits) … #define DECLARE_AD576x_CHANNELS(_name, _bits) … static DECLARE_AD576x_CHANNELS(ad5766_channels, 16); static DECLARE_AD576x_CHANNELS(ad5767_channels, 12); static const struct ad5766_chip_info ad5766_chip_infos[] = …; static int ad5766_get_output_range(struct ad5766_state *st) { … } static int ad5766_default_setup(struct ad5766_state *st) { … } static irqreturn_t ad5766_trigger_handler(int irq, void *p) { … } static int ad5766_probe(struct spi_device *spi) { … } static const struct of_device_id ad5766_dt_match[] = …; MODULE_DEVICE_TABLE(of, ad5766_dt_match); static const struct spi_device_id ad5766_spi_ids[] = …; MODULE_DEVICE_TABLE(spi, ad5766_spi_ids); static struct spi_driver ad5766_driver = …; module_spi_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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