linux/drivers/iio/dac/ad5421.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * AD5421 Digital to analog converters  driver
 *
 * Copyright 2011 Analog Devices Inc.
 */

#include <linux/device.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <linux/sysfs.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
#include <linux/iio/dac/ad5421.h>


#define AD5421_REG_DAC_DATA …
#define AD5421_REG_CTRL …
#define AD5421_REG_OFFSET …
#define AD5421_REG_GAIN …
/* load dac and fault shared the same register number. Writing to it will cause
 * a dac load command, reading from it will return the fault status register */
#define AD5421_REG_LOAD_DAC …
#define AD5421_REG_FAULT …
#define AD5421_REG_FORCE_ALARM_CURRENT …
#define AD5421_REG_RESET …
#define AD5421_REG_START_CONVERSION …
#define AD5421_REG_NOOP …

#define AD5421_CTRL_WATCHDOG_DISABLE …
#define AD5421_CTRL_AUTO_FAULT_READBACK …
#define AD5421_CTRL_MIN_CURRENT …
#define AD5421_CTRL_ADC_SOURCE_TEMP …
#define AD5421_CTRL_ADC_ENABLE …
#define AD5421_CTRL_PWR_DOWN_INT_VREF …

#define AD5421_FAULT_SPI …
#define AD5421_FAULT_PEC …
#define AD5421_FAULT_OVER_CURRENT …
#define AD5421_FAULT_UNDER_CURRENT …
#define AD5421_FAULT_TEMP_OVER_140 …
#define AD5421_FAULT_TEMP_OVER_100 …
#define AD5421_FAULT_UNDER_VOLTAGE_6V …
#define AD5421_FAULT_UNDER_VOLTAGE_12V …

/* These bits will cause the fault pin to go high */
#define AD5421_FAULT_TRIGGER_IRQ …

/**
 * struct ad5421_state - driver instance specific data
 * @spi:		spi_device
 * @ctrl:		control register cache
 * @current_range:	current range which the device is configured for
 * @data:		spi transfer buffers
 * @fault_mask:		software masking of events
 * @lock:		lock to protect the data buffer during SPI ops
 */
struct ad5421_state { … };

static const struct iio_event_spec ad5421_current_event[] = …;

static const struct iio_event_spec ad5421_temp_event[] = …;

static const struct iio_chan_spec ad5421_channels[] = …;

static int ad5421_write_unlocked(struct iio_dev *indio_dev,
	unsigned int reg, unsigned int val)
{ … }

static int ad5421_write(struct iio_dev *indio_dev, unsigned int reg,
	unsigned int val)
{ … }

static int ad5421_read(struct iio_dev *indio_dev, unsigned int reg)
{ … }

static int ad5421_update_ctrl(struct iio_dev *indio_dev, unsigned int set,
	unsigned int clr)
{ … }

static irqreturn_t ad5421_fault_handler(int irq, void *data)
{ … }

static void ad5421_get_current_min_max(struct ad5421_state *st,
	unsigned int *min, unsigned int *max)
{ … }

static inline unsigned int ad5421_get_offset(struct ad5421_state *st)
{ … }

static int ad5421_read_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan, int *val, int *val2, long m)
{ … }

static int ad5421_write_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan, int val, int val2, long mask)
{ … }

static int ad5421_write_event_config(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan, enum iio_event_type type,
	enum iio_event_direction dir, int state)
{ … }

static int ad5421_read_event_config(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan, enum iio_event_type type,
	enum iio_event_direction dir)
{ … }

static int ad5421_read_event_value(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan, enum iio_event_type type,
	enum iio_event_direction dir, enum iio_event_info info, int *val,
	int *val2)
{ … }

static const struct iio_info ad5421_info = …;

static int ad5421_probe(struct spi_device *spi)
{ … }

static struct spi_driver ad5421_driver = …;
module_spi_driver(…) …;

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