linux/drivers/iio/dac/ltc2632.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * LTC2632 Digital to analog convertors spi driver
 *
 * Copyright 2017 Maxime Roussin-Bélanger
 * expanded by Silvan Murer <[email protected]>
 */

#include <linux/device.h>
#include <linux/spi/spi.h>
#include <linux/module.h>
#include <linux/iio/iio.h>
#include <linux/property.h>
#include <linux/regulator/consumer.h>

#include <linux/unaligned.h>

#define LTC2632_CMD_WRITE_INPUT_N …
#define LTC2632_CMD_UPDATE_DAC_N …
#define LTC2632_CMD_WRITE_INPUT_N_UPDATE_ALL …
#define LTC2632_CMD_WRITE_INPUT_N_UPDATE_N …
#define LTC2632_CMD_POWERDOWN_DAC_N …
#define LTC2632_CMD_POWERDOWN_CHIP …
#define LTC2632_CMD_INTERNAL_REFER …
#define LTC2632_CMD_EXTERNAL_REFER …

/**
 * struct ltc2632_chip_info - chip specific information
 * @channels:		channel spec for the DAC
 * @num_channels:	DAC channel count of the chip
 * @vref_mv:		internal reference voltage
 */
struct ltc2632_chip_info { … };

/**
 * struct ltc2632_state - driver instance specific data
 * @spi_dev:			pointer to the spi_device struct
 * @powerdown_cache_mask:	used to show current channel powerdown state
 * @vref_mv:			used reference voltage (internal or external)
 * @vref_reg:		regulator for the reference voltage
 */
struct ltc2632_state { … };

enum ltc2632_supported_device_ids { … };

static int ltc2632_spi_write(struct spi_device *spi,
			     u8 cmd, u8 addr, u16 val, u8 shift)
{ … }

static int ltc2632_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan,
			    int *val,
			    int *val2,
			    long m)
{ … }

static int ltc2632_write_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int val,
			     int val2,
			     long mask)
{ … }

static ssize_t ltc2632_read_dac_powerdown(struct iio_dev *indio_dev,
					  uintptr_t private,
					  const struct iio_chan_spec *chan,
					  char *buf)
{ … }

static ssize_t ltc2632_write_dac_powerdown(struct iio_dev *indio_dev,
					   uintptr_t private,
					   const struct iio_chan_spec *chan,
					   const char *buf,
					   size_t len)
{ … }

static const struct iio_info ltc2632_info = …;

static const struct iio_chan_spec_ext_info ltc2632_ext_info[] = …;

#define LTC2632_CHANNEL(_chan, _bits) …

#define DECLARE_LTC2632_CHANNELS(_name, _bits) …

static DECLARE_LTC2632_CHANNELS(ltc2632x12, 12);
static DECLARE_LTC2632_CHANNELS(ltc2632x10, 10);
static DECLARE_LTC2632_CHANNELS(ltc2632x8, 8);

static const struct ltc2632_chip_info ltc2632_chip_info_tbl[] = …;

static int ltc2632_probe(struct spi_device *spi)
{ … }

static void ltc2632_remove(struct spi_device *spi)
{ … }

static const struct spi_device_id ltc2632_id[] = …;
MODULE_DEVICE_TABLE(spi, ltc2632_id);

static const struct of_device_id ltc2632_of_match[] = …;
MODULE_DEVICE_TABLE(of, ltc2632_of_match);

static struct spi_driver ltc2632_driver = …;
module_spi_driver(…) …;

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