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");
104