Merge tag 'hardening-v5.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-microblaze.git] / drivers / iio / dac / ad5686-spi.c
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
16 static 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
49 static 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
90 static 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
98 static int ad5686_spi_remove(struct spi_device *spi)
99 {
100         return ad5686_remove(&spi->dev);
101 }
102
103 static 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 };
122 MODULE_DEVICE_TABLE(spi, ad5686_spi_id);
123
124 static 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
133 module_spi_driver(ad5686_spi_driver);
134
135 MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
136 MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs");
137 MODULE_LICENSE("GPL v2");