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