drivers/iio/dac/ad5446-spi.c

Source file repositories/reference/linux-study-clean/drivers/iio/dac/ad5446-spi.c

File Facts

System
Linux kernel
Corpus path
drivers/iio/dac/ad5446-spi.c
Extension
.c
Size
8667 bytes
Lines
253
Domain
Driver Families
Bucket
drivers/iio
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * AD5446 SPI DAC driver
 *
 * Copyright 2025 Analog Devices Inc.
 */
#include <linux/err.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/spi/spi.h>
#include <linux/unaligned.h>

#include <asm/byteorder.h>

#include "ad5446.h"

static int ad5446_write(struct ad5446_state *st, unsigned int val)
{
	struct spi_device *spi = to_spi_device(st->dev);

	st->d16 = cpu_to_be16(val);

	return spi_write(spi, &st->d16, sizeof(st->d16));
}

static int ad5660_write(struct ad5446_state *st, unsigned int val)
{
	struct spi_device *spi = to_spi_device(st->dev);

	put_unaligned_be24(val, st->d24);

	return spi_write(spi, st->d24, sizeof(st->d24));
}

static int ad5446_spi_probe(struct spi_device *spi)
{
	const struct spi_device_id *id = spi_get_device_id(spi);
	const struct ad5446_chip_info *chip_info;

	chip_info = spi_get_device_match_data(spi);
	if (!chip_info)
		return -ENODEV;

	return ad5446_probe(&spi->dev, id->name, chip_info);
}

/*
 * ad5446_supported_spi_device_ids:
 * The AD5620/40/60 parts are available in different fixed internal reference
 * voltage options. The actual part numbers may look differently
 * (and a bit cryptic), however this style is used to make clear which
 * parts are supported here.
 */

static const struct ad5446_chip_info ad5300_chip_info = {
	.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4),
	.write = ad5446_write,
};

static const struct ad5446_chip_info ad5310_chip_info = {
	.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2),
	.write = ad5446_write,
};

static const struct ad5446_chip_info ad5320_chip_info = {
	.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0),
	.write = ad5446_write,
};

static const struct ad5446_chip_info ad5444_chip_info = {
	.channel = AD5446_CHANNEL(12, 16, 2),
	.write = ad5446_write,
};

static const struct ad5446_chip_info ad5446_chip_info = {
	.channel = AD5446_CHANNEL(14, 16, 0),
	.write = ad5446_write,
};

static const struct ad5446_chip_info ad5450_chip_info = {
	.channel = AD5446_CHANNEL(8, 16, 6),
	.write = ad5446_write,
};

static const struct ad5446_chip_info ad5451_chip_info = {
	.channel = AD5446_CHANNEL(10, 16, 4),
	.write = ad5446_write,
};

static const struct ad5446_chip_info ad5541a_chip_info = {

Annotation

Implementation Notes