linux/drivers/staging/iio/adc/ad7816.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * AD7816 digital temperature sensor driver supporting AD7816/7/8
 *
 * Copyright 2010 Analog Devices Inc.
 */

#include <linux/interrupt.h>
#include <linux/gpio/consumer.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/list.h>
#include <linux/spi/spi.h>
#include <linux/module.h>

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

/*
 * AD7816 config masks
 */
#define AD7816_FULL …
#define AD7816_PD …
#define AD7816_CS_MASK …
#define AD7816_CS_MAX …

/*
 * AD7816 temperature masks
 */
#define AD7816_VALUE_OFFSET …
#define AD7816_BOUND_VALUE_BASE …
#define AD7816_BOUND_VALUE_MIN …
#define AD7816_BOUND_VALUE_MAX …
#define AD7816_TEMP_FLOAT_OFFSET …
#define AD7816_TEMP_FLOAT_MASK …

/*
 * struct ad7816_chip_info - chip specific information
 */

struct ad7816_chip_info { … };

enum ad7816_type { … };

/*
 * ad7816 data access by SPI
 */
static int ad7816_spi_read(struct ad7816_chip_info *chip, u16 *data)
{ … }

static int ad7816_spi_write(struct ad7816_chip_info *chip, u8 data)
{ … }

static ssize_t ad7816_show_mode(struct device *dev,
				struct device_attribute *attr,
				char *buf)
{ … }

static ssize_t ad7816_store_mode(struct device *dev,
				 struct device_attribute *attr,
				 const char *buf,
				 size_t len)
{ … }

static IIO_DEVICE_ATTR(mode, 0644,
		ad7816_show_mode,
		ad7816_store_mode,
		0);

static ssize_t ad7816_show_available_modes(struct device *dev,
					   struct device_attribute *attr,
					   char *buf)
{ … }

static IIO_DEVICE_ATTR(available_modes, 0444, ad7816_show_available_modes,
			NULL, 0);

static ssize_t ad7816_show_channel(struct device *dev,
				   struct device_attribute *attr,
				   char *buf)
{ … }

static ssize_t ad7816_store_channel(struct device *dev,
				    struct device_attribute *attr,
				    const char *buf,
				    size_t len)
{ … }

static IIO_DEVICE_ATTR(channel, 0644,
		ad7816_show_channel,
		ad7816_store_channel,
		0);

static ssize_t ad7816_show_value(struct device *dev,
				 struct device_attribute *attr,
				 char *buf)
{ … }

static IIO_DEVICE_ATTR(value, 0444, ad7816_show_value, NULL, 0);

static struct attribute *ad7816_attributes[] = …;

static const struct attribute_group ad7816_attribute_group = …;

/*
 * temperature bound events
 */

#define IIO_EVENT_CODE_AD7816_OTI …

static irqreturn_t ad7816_event_handler(int irq, void *private)
{ … }

static ssize_t ad7816_show_oti(struct device *dev,
			       struct device_attribute *attr,
			       char *buf)
{ … }

static inline ssize_t ad7816_set_oti(struct device *dev,
				     struct device_attribute *attr,
				     const char *buf,
				     size_t len)
{ … }

static IIO_DEVICE_ATTR(oti, 0644,
		       ad7816_show_oti, ad7816_set_oti, 0);

static struct attribute *ad7816_event_attributes[] = …;

static const struct attribute_group ad7816_event_attribute_group = …;

static const struct iio_info ad7816_info = …;

/*
 * device probe and remove
 */

static int ad7816_probe(struct spi_device *spi_dev)
{ … }

static const struct of_device_id ad7816_of_match[] = …;
MODULE_DEVICE_TABLE(of, ad7816_of_match);

static const struct spi_device_id ad7816_id[] = …;

MODULE_DEVICE_TABLE(spi, ad7816_id);

static struct spi_driver ad7816_driver = …;
module_spi_driver(…) …;

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