linux/drivers/iio/potentiometer/max5481.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Maxim Integrated MAX5481-MAX5484 digital potentiometer driver
 * Copyright 2016 Rockwell Collins
 *
 * Datasheet:
 * https://datasheets.maximintegrated.com/en/ds/MAX5481-MAX5484.pdf
 */

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/property.h>
#include <linux/spi/spi.h>

/* write wiper reg */
#define MAX5481_WRITE_WIPER …
/* copy wiper reg to NV reg */
#define MAX5481_COPY_AB_TO_NV …
/* copy NV reg to wiper reg */
#define MAX5481_COPY_NV_TO_AB …

#define MAX5481_MAX_POS …

enum max5481_variant { … };

struct max5481_cfg { … };

static const struct max5481_cfg max5481_cfg[] = …;

struct max5481_data { … };

#define MAX5481_CHANNEL …

static const struct iio_chan_spec max5481_channels[] = …;

static int max5481_write_cmd(struct max5481_data *data, u8 cmd, u16 val)
{ … }

static int max5481_read_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const *chan,
		int *val, int *val2, long mask)
{ … }

static int max5481_write_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const *chan,
		int val, int val2, long mask)
{ … }

static const struct iio_info max5481_info = …;

static const struct of_device_id max5481_match[] = …;
MODULE_DEVICE_TABLE(of, max5481_match);

static void max5481_wiper_save(void *data)
{ … }

static int max5481_probe(struct spi_device *spi)
{ … }

static const struct spi_device_id max5481_id_table[] = …;
MODULE_DEVICE_TABLE(spi, max5481_id_table);

static struct spi_driver max5481_driver = …;

module_spi_driver(…) …;

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;