1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * AD5671R, AD5675R, AD5691R, AD5692R, AD5693, AD5693R,
  4 * 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			    const struct i2c_device_id *id)
 63{
 64	return ad5686_probe(&i2c->dev, id->driver_data, id->name,
 65			    ad5686_i2c_write, ad5686_i2c_read);
 66}
 67
 68static int ad5686_i2c_remove(struct i2c_client *i2c)
 69{
 70	return ad5686_remove(&i2c->dev);
 71}
 72
 73static const struct i2c_device_id ad5686_i2c_id[] = {
 74	{"ad5311r", ID_AD5311R},
 75	{"ad5671r", ID_AD5671R},
 76	{"ad5675r", ID_AD5675R},
 77	{"ad5691r", ID_AD5691R},
 78	{"ad5692r", ID_AD5692R},
 79	{"ad5693", ID_AD5693},
 80	{"ad5693r", ID_AD5693R},
 81	{"ad5694", ID_AD5694},
 82	{"ad5694r", ID_AD5694R},
 83	{"ad5695r", ID_AD5695R},
 84	{"ad5696", ID_AD5696},
 85	{"ad5696r", ID_AD5696R},
 86	{}
 87};
 88MODULE_DEVICE_TABLE(i2c, ad5686_i2c_id);
 89
 90static struct i2c_driver ad5686_i2c_driver = {
 91	.driver = {
 92		.name = "ad5696",
 93	},
 94	.probe = ad5686_i2c_probe,
 95	.remove = ad5686_i2c_remove,
 96	.id_table = ad5686_i2c_id,
 97};
 98
 99module_i2c_driver(ad5686_i2c_driver);
100
101MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
102MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs");
103MODULE_LICENSE("GPL v2");