ad5696-i2c.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * AD5338R, AD5671R, AD5673R, AD5675R, AD5677R, AD5691R, AD5692R, AD5693,
  4 * AD5693R, AD5694, AD5694R, AD5695R, AD5696, AD5696R
  5 * Digital to analog converters driver
  6 *
  7 * Copyright 2018 Analog Devices Inc.
  8 */
  9
 10#include "ad5686.h"
 11
 12#include <linux/module.h>
 13#include <linux/i2c.h>
 14
 15static int ad5686_i2c_read(struct ad5686_state *st, u8 addr)
 16{
 17	struct i2c_client *i2c = to_i2c_client(st->dev);
 18	struct i2c_msg msg[2] = {
 19		{
 20			.addr = i2c->addr,
 21			.flags = i2c->flags,
 22			.len = 3,
 23			.buf = &st->data[0].d8[1],
 24		},
 25		{
 26			.addr = i2c->addr,
 27			.flags = i2c->flags | I2C_M_RD,
 28			.len = 2,
 29			.buf = (char *)&st->data[0].d16,
 30		},
 31	};
 32	int ret;
 33
 34	st->data[0].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP) |
 35				      AD5686_ADDR(addr) |
 36				      0x00);
 37
 38	ret = i2c_transfer(i2c->adapter, msg, 2);
 39	if (ret < 0)
 40		return ret;
 41
 42	return be16_to_cpu(st->data[0].d16);
 43}
 44
 45static int ad5686_i2c_write(struct ad5686_state *st,
 46			    u8 cmd, u8 addr, u16 val)
 47{
 48	struct i2c_client *i2c = to_i2c_client(st->dev);
 49	int ret;
 50
 51	st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | AD5686_ADDR(addr)
 52				      | val);
 53
 54	ret = i2c_master_send(i2c, &st->data[0].d8[1], 3);
 55	if (ret < 0)
 56		return ret;
 57
 58	return (ret != 3) ? -EIO : 0;
 59}
 60
 61static int ad5686_i2c_probe(struct i2c_client *i2c)
 62{
 63	const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
 64	return ad5686_probe(&i2c->dev, id->driver_data, id->name,
 65			    ad5686_i2c_write, ad5686_i2c_read);
 66}
 67
 68static const struct i2c_device_id ad5686_i2c_id[] = {
 69	{"ad5311r", ID_AD5311R},
 70	{"ad5337r", ID_AD5337R},
 71	{"ad5338r", ID_AD5338R},
 72	{"ad5671r", ID_AD5671R},
 73	{"ad5673r", ID_AD5673R},
 74	{"ad5675r", ID_AD5675R},
 75	{"ad5677r", ID_AD5677R},
 76	{"ad5691r", ID_AD5691R},
 77	{"ad5692r", ID_AD5692R},
 78	{"ad5693", ID_AD5693},
 79	{"ad5693r", ID_AD5693R},
 80	{"ad5694", ID_AD5694},
 81	{"ad5694r", ID_AD5694R},
 82	{"ad5695r", ID_AD5695R},
 83	{"ad5696", ID_AD5696},
 84	{"ad5696r", ID_AD5696R},
 85	{ }
 86};
 87MODULE_DEVICE_TABLE(i2c, ad5686_i2c_id);
 88
 89static const struct of_device_id ad5686_of_match[] = {
 90	{ .compatible = "adi,ad5311r" },
 91	{ .compatible = "adi,ad5337r" },
 92	{ .compatible = "adi,ad5338r" },
 93	{ .compatible = "adi,ad5671r" },
 94	{ .compatible = "adi,ad5675r" },
 95	{ .compatible = "adi,ad5691r" },
 96	{ .compatible = "adi,ad5692r" },
 97	{ .compatible = "adi,ad5693" },
 98	{ .compatible = "adi,ad5693r" },
 99	{ .compatible = "adi,ad5694" },
100	{ .compatible = "adi,ad5694r" },
101	{ .compatible = "adi,ad5695r" },
102	{ .compatible = "adi,ad5696" },
103	{ .compatible = "adi,ad5696r" },
104	{ }
105};
106MODULE_DEVICE_TABLE(of, ad5686_of_match);
107
108static struct i2c_driver ad5686_i2c_driver = {
109	.driver = {
110		.name = "ad5696",
111		.of_match_table = ad5686_of_match,
112	},
113	.probe = ad5686_i2c_probe,
114	.id_table = ad5686_i2c_id,
115};
116
117module_i2c_driver(ad5686_i2c_driver);
118
119MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
120MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs");
121MODULE_LICENSE("GPL v2");
122MODULE_IMPORT_NS("IIO_AD5686");