1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * AD5446 SPI I2C driver
4 *
5 * Copyright 2025 Analog Devices Inc.
6 */
7 #include <linux/err.h>
8 #include <linux/module.h>
9 #include <linux/i2c.h>
10
11 #include <asm/byteorder.h>
12
13 #include "ad5446.h"
14
ad5622_write(struct ad5446_state * st,unsigned int val)15 static int ad5622_write(struct ad5446_state *st, unsigned int val)
16 {
17 struct i2c_client *client = to_i2c_client(st->dev);
18 int ret;
19
20 st->d16 = cpu_to_be16(val);
21
22 ret = i2c_master_send_dmasafe(client, (char *)&st->d16, sizeof(st->d16));
23 if (ret < 0)
24 return ret;
25 if (ret != sizeof(st->d16))
26 return -EIO;
27
28 return 0;
29 }
30
ad5446_i2c_probe(struct i2c_client * i2c)31 static int ad5446_i2c_probe(struct i2c_client *i2c)
32 {
33 const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
34 const struct ad5446_chip_info *chip_info;
35
36 chip_info = i2c_get_match_data(i2c);
37 if (!chip_info)
38 return -ENODEV;
39
40 return ad5446_probe(&i2c->dev, id->name, chip_info);
41 }
42
43 /*
44 * ad5446_supported_i2c_device_ids:
45 * The AD5620/40/60 parts are available in different fixed internal reference
46 * voltage options. The actual part numbers may look differently
47 * (and a bit cryptic), however this style is used to make clear which
48 * parts are supported here.
49 */
50
51 static const struct ad5446_chip_info ad5602_chip_info = {
52 .channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4),
53 .write = ad5622_write,
54 };
55
56 static const struct ad5446_chip_info ad5612_chip_info = {
57 .channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2),
58 .write = ad5622_write,
59 };
60
61 static const struct ad5446_chip_info ad5622_chip_info = {
62 .channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0),
63 .write = ad5622_write,
64 };
65
66 static const struct i2c_device_id ad5446_i2c_ids[] = {
67 { .name = "ad5301", .driver_data = (kernel_ulong_t)&ad5602_chip_info },
68 { .name = "ad5311", .driver_data = (kernel_ulong_t)&ad5612_chip_info },
69 { .name = "ad5321", .driver_data = (kernel_ulong_t)&ad5622_chip_info },
70 { .name = "ad5602", .driver_data = (kernel_ulong_t)&ad5602_chip_info },
71 { .name = "ad5612", .driver_data = (kernel_ulong_t)&ad5612_chip_info },
72 { .name = "ad5622", .driver_data = (kernel_ulong_t)&ad5622_chip_info },
73 { }
74 };
75 MODULE_DEVICE_TABLE(i2c, ad5446_i2c_ids);
76
77 static const struct of_device_id ad5446_i2c_of_ids[] = {
78 { .compatible = "adi,ad5301", .data = &ad5602_chip_info },
79 { .compatible = "adi,ad5311", .data = &ad5612_chip_info },
80 { .compatible = "adi,ad5321", .data = &ad5622_chip_info },
81 { .compatible = "adi,ad5602", .data = &ad5602_chip_info },
82 { .compatible = "adi,ad5612", .data = &ad5612_chip_info },
83 { .compatible = "adi,ad5622", .data = &ad5622_chip_info },
84 { }
85 };
86 MODULE_DEVICE_TABLE(of, ad5446_i2c_of_ids);
87
88 static struct i2c_driver ad5446_i2c_driver = {
89 .driver = {
90 .name = "ad5446",
91 .of_match_table = ad5446_i2c_of_ids,
92 },
93 .probe = ad5446_i2c_probe,
94 .id_table = ad5446_i2c_ids,
95 };
96 module_i2c_driver(ad5446_i2c_driver);
97
98 MODULE_AUTHOR("Nuno Sá <nuno.sa@analog.com>");
99 MODULE_DESCRIPTION("Analog Devices AD5622 and similar I2C DACs");
100 MODULE_LICENSE("GPL");
101 MODULE_IMPORT_NS("IIO_AD5446");
102