linux/include/linux/iio/adc/ad_sigma_delta.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Support code for Analog Devices Sigma-Delta ADCs
 *
 * Copyright 2012 Analog Devices Inc.
 *  Author: Lars-Peter Clausen <[email protected]>
 */
#ifndef __AD_SIGMA_DELTA_H__
#define __AD_SIGMA_DELTA_H__

#include <linux/iio/iio.h>

enum ad_sigma_delta_mode { … };

/**
 * struct ad_sigma_delta_calib_data - Calibration data for Sigma Delta devices
 * @mode: Calibration mode.
 * @channel: Calibration channel.
 */
struct ad_sd_calib_data { … };

struct ad_sigma_delta;
struct device;
struct iio_dev;

/**
 * struct ad_sigma_delta_info - Sigma Delta driver specific callbacks and options
 * @set_channel: Will be called to select the current channel, may be NULL.
 * @append_status: Will be called to enable status append at the end of the sample, may be NULL.
 * @set_mode: Will be called to select the current mode, may be NULL.
 * @disable_all: Will be called to disable all channels, may be NULL.
 * @disable_one: Will be called to disable a single channel after
 *		ad_sigma_delta_single_conversion(), may be NULL.
 *		Usage of this callback expects iio_chan_spec.address to contain
 *		the value required for the driver to identify the channel.
 * @postprocess_sample: Is called for each sampled data word, can be used to
 *		modify or drop the sample data, it, may be NULL.
 * @has_registers: true if the device has writable and readable registers, false
 *		if there is just one read-only sample data shift register.
 * @addr_shift: Shift of the register address in the communications register.
 * @read_mask: Mask for the communications register having the read bit set.
 * @status_ch_mask: Mask for the channel number stored in status register.
 * @data_reg: Address of the data register, if 0 the default address of 0x3 will
 *   be used.
 * @irq_flags: flags for the interrupt used by the triggered buffer
 * @num_slots: Number of sequencer slots
 * @irq_line: IRQ for reading conversions. If 0, spi->irq will be used
 */
struct ad_sigma_delta_info { … };

/**
 * struct ad_sigma_delta - Sigma Delta device struct
 * @spi: The spi device associated with the Sigma Delta device.
 * @trig: The IIO trigger associated with the Sigma Delta device.
 *
 * Most of the fields are private to the sigma delta library code and should not
 * be accessed by individual drivers.
 */
struct ad_sigma_delta { … };

static inline int ad_sigma_delta_set_channel(struct ad_sigma_delta *sd,
	unsigned int channel)
{ … }

static inline int ad_sigma_delta_append_status(struct ad_sigma_delta *sd, bool append)
{ … }

static inline int ad_sigma_delta_disable_all(struct ad_sigma_delta *sd)
{ … }

static inline int ad_sigma_delta_disable_one(struct ad_sigma_delta *sd,
					     unsigned int chan)
{ … }

static inline int ad_sigma_delta_set_mode(struct ad_sigma_delta *sd,
	unsigned int mode)
{ … }

static inline int ad_sigma_delta_postprocess_sample(struct ad_sigma_delta *sd,
	unsigned int raw_sample)
{ … }

void ad_sd_set_comm(struct ad_sigma_delta *sigma_delta, uint8_t comm);
int ad_sd_write_reg(struct ad_sigma_delta *sigma_delta, unsigned int reg,
	unsigned int size, unsigned int val);
int ad_sd_read_reg(struct ad_sigma_delta *sigma_delta, unsigned int reg,
	unsigned int size, unsigned int *val);

int ad_sd_reset(struct ad_sigma_delta *sigma_delta,
	unsigned int reset_length);

int ad_sigma_delta_single_conversion(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan, int *val);
int ad_sd_calibrate(struct ad_sigma_delta *sigma_delta,
	unsigned int mode, unsigned int channel);
int ad_sd_calibrate_all(struct ad_sigma_delta *sigma_delta,
	const struct ad_sd_calib_data *cd, unsigned int n);
int ad_sd_init(struct ad_sigma_delta *sigma_delta, struct iio_dev *indio_dev,
	struct spi_device *spi, const struct ad_sigma_delta_info *info);

int devm_ad_sd_setup_buffer_and_trigger(struct device *dev, struct iio_dev *indio_dev);

int ad_sd_validate_trigger(struct iio_dev *indio_dev, struct iio_trigger *trig);

#endif