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, len: 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, xfers: 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(sdev: spi);
93
94 return ad5686_probe(dev: &spi->dev, chip_type: id->driver_data, name: id->name,
95 write: ad5686_spi_write, read: ad5686_spi_read);
96}
97
98static const struct spi_device_id ad5686_spi_id[] = {
99 {"ad5310r", ID_AD5310R},
100 {"ad5672r", ID_AD5672R},
101 {"ad5674r", ID_AD5674R},
102 {"ad5676", ID_AD5676},
103 {"ad5676r", ID_AD5676R},
104 {"ad5679r", ID_AD5679R},
105 {"ad5681r", ID_AD5681R},
106 {"ad5682r", ID_AD5682R},
107 {"ad5683", ID_AD5683},
108 {"ad5683r", ID_AD5683R},
109 {"ad5684", ID_AD5684},
110 {"ad5684r", ID_AD5684R},
111 {"ad5685", ID_AD5685R}, /* Does not exist */
112 {"ad5685r", ID_AD5685R},
113 {"ad5686", ID_AD5686},
114 {"ad5686r", ID_AD5686R},
115 { }
116};
117MODULE_DEVICE_TABLE(spi, ad5686_spi_id);
118
119static struct spi_driver ad5686_spi_driver = {
120 .driver = {
121 .name = "ad5686",
122 },
123 .probe = ad5686_spi_probe,
124 .id_table = ad5686_spi_id,
125};
126
127module_spi_driver(ad5686_spi_driver);
128
129MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
130MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs");
131MODULE_LICENSE("GPL v2");
132MODULE_IMPORT_NS("IIO_AD5686");
133

source code of linux/drivers/iio/dac/ad5686-spi.c