1// SPDX-License-Identifier: GPL-2.0
2/*
3 * AD5672R, AD5674R, AD5676, AD5676R, AD5679R,
4 * AD5681R, AD5682R, AD5683, AD5683R, AD5684,
5 * AD5684R, AD5685R, AD5686, AD5686R
6 * Digital to analog converters driver
7 *
8 * Copyright 2018 Analog Devices Inc.
9 */
10
11#include "ad5686.h"
12
13#include <linux/module.h>
14#include <linux/spi/spi.h>
15
16static int ad5686_spi_write(struct ad5686_state *st,
17			    u8 cmd, u8 addr, u16 val)
18{
19	struct spi_device *spi = to_spi_device(st->dev);
20	u8 tx_len, *buf;
21
22	switch (st->chip_info->regmap_type) {
23	case AD5310_REGMAP:
24		st->data[0].d16 = cpu_to_be16(AD5310_CMD(cmd) |
25					      val);
26		buf = &st->data[0].d8[0];
27		tx_len = 2;
28		break;
29	case AD5683_REGMAP:
30		st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
31					      AD5683_DATA(val));
32		buf = &st->data[0].d8[1];
33		tx_len = 3;
34		break;
35	case AD5686_REGMAP:
36		st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
37					      AD5686_ADDR(addr) |
38					      val);
39		buf = &st->data[0].d8[1];
40		tx_len = 3;
41		break;
42	default:
43		return -EINVAL;
44	}
45
46	return spi_write(spi, buf, tx_len);
47}
48
49static int ad5686_spi_read(struct ad5686_state *st, u8 addr)
50{
51	struct spi_transfer t[] = {
52		{
53			.tx_buf = &st->data[0].d8[1],
54			.len = 3,
55			.cs_change = 1,
56		}, {
57			.tx_buf = &st->data[1].d8[1],
58			.rx_buf = &st->data[2].d8[1],
59			.len = 3,
60		},
61	};
62	struct spi_device *spi = to_spi_device(st->dev);
63	u8 cmd = 0;
64	int ret;
65
66	switch (st->chip_info->regmap_type) {
67	case AD5310_REGMAP:
68		return -ENOTSUPP;
69	case AD5683_REGMAP:
70		cmd = AD5686_CMD_READBACK_ENABLE_V2;
71		break;
72	case AD5686_REGMAP:
73		cmd = AD5686_CMD_READBACK_ENABLE;
74		break;
75	default:
76		return -EINVAL;
77	}
78
79	st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
80				      AD5686_ADDR(addr));
81	st->data[1].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP));
82
83	ret = spi_sync_transfer(spi, t, ARRAY_SIZE(t));
84	if (ret < 0)
85		return ret;
86
87	return be32_to_cpu(st->data[2].d32);
88}
89
90static int ad5686_spi_probe(struct spi_device *spi)
91{
92	const struct spi_device_id *id = spi_get_device_id(spi);
93
94	return ad5686_probe(&spi->dev, id->driver_data, id->name,
95			    ad5686_spi_write, ad5686_spi_read);
96}
97
98static void ad5686_spi_remove(struct spi_device *spi)
99{
100	ad5686_remove(&spi->dev);
101}
102
103static const struct spi_device_id ad5686_spi_id[] = {
104	{"ad5310r", ID_AD5310R},
105	{"ad5672r", ID_AD5672R},
106	{"ad5674r", ID_AD5674R},
107	{"ad5676", ID_AD5676},
108	{"ad5676r", ID_AD5676R},
109	{"ad5679r", ID_AD5679R},
110	{"ad5681r", ID_AD5681R},
111	{"ad5682r", ID_AD5682R},
112	{"ad5683", ID_AD5683},
113	{"ad5683r", ID_AD5683R},
114	{"ad5684", ID_AD5684},
115	{"ad5684r", ID_AD5684R},
116	{"ad5685", ID_AD5685R}, /* Does not exist */
117	{"ad5685r", ID_AD5685R},
118	{"ad5686", ID_AD5686},
119	{"ad5686r", ID_AD5686R},
120	{}
121};
122MODULE_DEVICE_TABLE(spi, ad5686_spi_id);
123
124static struct spi_driver ad5686_spi_driver = {
125	.driver = {
126		.name = "ad5686",
127	},
128	.probe = ad5686_spi_probe,
129	.remove = ad5686_spi_remove,
130	.id_table = ad5686_spi_id,
131};
132
133module_spi_driver(ad5686_spi_driver);
134
135MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
136MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs");
137MODULE_LICENSE("GPL v2");
138MODULE_IMPORT_NS(IIO_AD5686);
139