linux/drivers/iio/adc/ltc2309.c

// SPDX-License-Identifier: GPL-2.0
/*
 * The LTC2309 is an 8-Channel, 12-Bit SAR ADC with an I2C Interface.
 *
 * Datasheet:
 * https://www.analog.com/media/en/technical-documentation/data-sheets/2309fd.pdf
 *
 * Copyright (c) 2023, Liam Beguin <[email protected]>
 */
#include <linux/bitfield.h>
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/regulator/consumer.h>

#define LTC2309_ADC_RESOLUTION …
#define LTC2309_INTERNAL_REF_MV …

#define LTC2309_DIN_CH_MASK …
#define LTC2309_DIN_SDN …
#define LTC2309_DIN_OSN …
#define LTC2309_DIN_S1 …
#define LTC2309_DIN_S0 …
#define LTC2309_DIN_UNI …
#define LTC2309_DIN_SLEEP …

/**
 * struct ltc2309 - internal device data structure
 * @dev:	Device reference
 * @client:	I2C reference
 * @lock:	Lock to serialize data access
 * @vref_mv:	Internal voltage reference
 */
struct ltc2309 { … };

/* Order matches expected channel address, See datasheet Table 1. */
enum ltc2309_channels { … };

#define LTC2309_CHAN(_chan, _addr) …

#define LTC2309_DIFF_CHAN(_chan, _chan2, _addr) …

static const struct iio_chan_spec ltc2309_channels[] = …;

static int ltc2309_read_raw_channel(struct ltc2309 *ltc2309,
				    unsigned long address, int *val)
{ … }

static int ltc2309_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan, int *val,
			    int *val2, long mask)
{ … }

static const struct iio_info ltc2309_info = …;

static int ltc2309_probe(struct i2c_client *client)
{ … }

static const struct of_device_id ltc2309_of_match[] = …;
MODULE_DEVICE_TABLE(of, ltc2309_of_match);

static const struct i2c_device_id ltc2309_id[] = …;
MODULE_DEVICE_TABLE(i2c, ltc2309_id);

static struct i2c_driver ltc2309_driver = …;
module_i2c_driver(…) …;

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