ad5446-i2c.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * AD5446 SPI I2C driver
  4 *
  5 * Copyright 2025 Analog Devices Inc.
  6 */
  7#include <linux/err.h>
  8#include <linux/module.h>
  9#include <linux/mod_devicetable.h>
 10#include <linux/i2c.h>
 11
 12#include <asm/byteorder.h>
 13
 14#include "ad5446.h"
 15
 16static int ad5622_write(struct ad5446_state *st, unsigned int val)
 17{
 18	struct i2c_client *client = to_i2c_client(st->dev);
 19	int ret;
 20
 21	st->d16 = cpu_to_be16(val);
 22
 23	ret = i2c_master_send_dmasafe(client, (char *)&st->d16, sizeof(st->d16));
 24	if (ret < 0)
 25		return ret;
 26	if (ret != sizeof(st->d16))
 27		return -EIO;
 28
 29	return 0;
 30}
 31
 32static int ad5446_i2c_probe(struct i2c_client *i2c)
 33{
 34	const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
 35	const struct ad5446_chip_info *chip_info;
 36
 37	chip_info = i2c_get_match_data(i2c);
 38	if (!chip_info)
 39		return -ENODEV;
 40
 41	return ad5446_probe(&i2c->dev, id->name, chip_info);
 42}
 43
 44/*
 45 * ad5446_supported_i2c_device_ids:
 46 * The AD5620/40/60 parts are available in different fixed internal reference
 47 * voltage options. The actual part numbers may look differently
 48 * (and a bit cryptic), however this style is used to make clear which
 49 * parts are supported here.
 50 */
 51
 52static const struct ad5446_chip_info ad5602_chip_info = {
 53	.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4),
 54	.write = ad5622_write,
 55};
 56
 57static const struct ad5446_chip_info ad5612_chip_info = {
 58	.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2),
 59	.write = ad5622_write,
 60};
 61
 62static const struct ad5446_chip_info ad5622_chip_info = {
 63	.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0),
 64	.write = ad5622_write,
 65};
 66
 67static const struct i2c_device_id ad5446_i2c_ids[] = {
 68	{"ad5301", (kernel_ulong_t)&ad5602_chip_info},
 69	{"ad5311", (kernel_ulong_t)&ad5612_chip_info},
 70	{"ad5321", (kernel_ulong_t)&ad5622_chip_info},
 71	{"ad5602", (kernel_ulong_t)&ad5602_chip_info},
 72	{"ad5612", (kernel_ulong_t)&ad5612_chip_info},
 73	{"ad5622", (kernel_ulong_t)&ad5622_chip_info},
 74	{ }
 75};
 76MODULE_DEVICE_TABLE(i2c, ad5446_i2c_ids);
 77
 78static const struct of_device_id ad5446_i2c_of_ids[] = {
 79	{ .compatible = "adi,ad5301", .data = &ad5602_chip_info },
 80	{ .compatible = "adi,ad5311", .data = &ad5612_chip_info },
 81	{ .compatible = "adi,ad5321", .data = &ad5622_chip_info },
 82	{ .compatible = "adi,ad5602", .data = &ad5602_chip_info },
 83	{ .compatible = "adi,ad5612", .data = &ad5612_chip_info },
 84	{ .compatible = "adi,ad5622", .data = &ad5622_chip_info },
 85	{ }
 86};
 87MODULE_DEVICE_TABLE(OF, ad5446_i2c_of_ids);
 88
 89static struct i2c_driver ad5446_i2c_driver = {
 90	.driver = {
 91		.name	= "ad5446",
 92		.of_match_table = ad5446_i2c_of_ids,
 93	},
 94	.probe = ad5446_i2c_probe,
 95	.id_table = ad5446_i2c_ids,
 96};
 97module_i2c_driver(ad5446_i2c_driver);
 98
 99MODULE_AUTHOR("Nuno Sá <nuno.sa@analog.com>");
100MODULE_DESCRIPTION("Analog Devices AD5622 and similar I2C DACs");
101MODULE_LICENSE("GPL");
102MODULE_IMPORT_NS("IIO_AD5446");