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/mod_devicetable.h>
10 #include <linux/i2c.h>
11
12 #include <asm/byteorder.h>
13
14 #include "ad5446.h"
15
ad5622_write(struct ad5446_state * st,unsigned int val)16 static int ad5622_write(struct ad5446_state *st, unsigned int val)
17 {
18 struct i2c_client *client = to_i2c_client(st->dev);
19 int ret;
20
21 st->d16 = cpu_to_be16(val);
22
23 ret = i2c_master_send_dmasafe(client, (char *)&st->d16, sizeof(st->d16));
24 if (ret < 0)
25 return ret;
26 if (ret != sizeof(st->d16))
27 return -EIO;
28
29 return 0;
30 }
31
ad5446_i2c_probe(struct i2c_client * i2c)32 static int ad5446_i2c_probe(struct i2c_client *i2c)
33 {
34 const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
35 const struct ad5446_chip_info *chip_info;
36
37 chip_info = i2c_get_match_data(i2c);
38 if (!chip_info)
39 return -ENODEV;
40
41 return ad5446_probe(&i2c->dev, id->name, chip_info);
42 }
43
44 /*
45 * ad5446_supported_i2c_device_ids:
46 * The AD5620/40/60 parts are available in different fixed internal reference
47 * voltage options. The actual part numbers may look differently
48 * (and a bit cryptic), however this style is used to make clear which
49 * parts are supported here.
50 */
51
52 static const struct ad5446_chip_info ad5602_chip_info = {
53 .channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4),
54 .write = ad5622_write,
55 };
56
57 static const struct ad5446_chip_info ad5612_chip_info = {
58 .channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2),
59 .write = ad5622_write,
60 };
61
62 static const struct ad5446_chip_info ad5622_chip_info = {
63 .channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0),
64 .write = ad5622_write,
65 };
66
67 static const struct i2c_device_id ad5446_i2c_ids[] = {
68 {"ad5301", (kernel_ulong_t)&ad5602_chip_info},
69 {"ad5311", (kernel_ulong_t)&ad5612_chip_info},
70 {"ad5321", (kernel_ulong_t)&ad5622_chip_info},
71 {"ad5602", (kernel_ulong_t)&ad5602_chip_info},
72 {"ad5612", (kernel_ulong_t)&ad5612_chip_info},
73 {"ad5622", (kernel_ulong_t)&ad5622_chip_info},
74 { }
75 };
76 MODULE_DEVICE_TABLE(i2c, ad5446_i2c_ids);
77
78 static const struct of_device_id ad5446_i2c_of_ids[] = {
79 { .compatible = "adi,ad5301", .data = &ad5602_chip_info },
80 { .compatible = "adi,ad5311", .data = &ad5612_chip_info },
81 { .compatible = "adi,ad5321", .data = &ad5622_chip_info },
82 { .compatible = "adi,ad5602", .data = &ad5602_chip_info },
83 { .compatible = "adi,ad5612", .data = &ad5612_chip_info },
84 { .compatible = "adi,ad5622", .data = &ad5622_chip_info },
85 { }
86 };
87 MODULE_DEVICE_TABLE(OF, ad5446_i2c_of_ids);
88
89 static struct i2c_driver ad5446_i2c_driver = {
90 .driver = {
91 .name = "ad5446",
92 .of_match_table = ad5446_i2c_of_ids,
93 },
94 .probe = ad5446_i2c_probe,
95 .id_table = ad5446_i2c_ids,
96 };
97 module_i2c_driver(ad5446_i2c_driver);
98
99 MODULE_AUTHOR("Nuno Sá <nuno.sa@analog.com>");
100 MODULE_DESCRIPTION("Analog Devices AD5622 and similar I2C DACs");
101 MODULE_LICENSE("GPL");
102 MODULE_IMPORT_NS("IIO_AD5446");
103