1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * AD5671R, AD5675R, AD5691R, AD5692R, AD5693, AD5693R,
4 * AD5694, AD5694R, AD5695R, AD5696, AD5696R
5 * Digital to analog converters driver
6 *
7 * Copyright 2018 Analog Devices Inc.
8 */
9
10 #include "ad5686.h"
11
12 #include <linux/module.h>
13 #include <linux/i2c.h>
14
ad5686_i2c_read(struct ad5686_state * st,u8 addr)15 static int ad5686_i2c_read(struct ad5686_state *st, u8 addr)
16 {
17 struct i2c_client *i2c = to_i2c_client(st->dev);
18 struct i2c_msg msg[2] = {
19 {
20 .addr = i2c->addr,
21 .flags = i2c->flags,
22 .len = 3,
23 .buf = &st->data[0].d8[1],
24 },
25 {
26 .addr = i2c->addr,
27 .flags = i2c->flags | I2C_M_RD,
28 .len = 2,
29 .buf = (char *)&st->data[0].d16,
30 },
31 };
32 int ret;
33
34 st->data[0].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP) |
35 AD5686_ADDR(addr) |
36 0x00);
37
38 ret = i2c_transfer(i2c->adapter, msg, 2);
39 if (ret < 0)
40 return ret;
41
42 return be16_to_cpu(st->data[0].d16);
43 }
44
ad5686_i2c_write(struct ad5686_state * st,u8 cmd,u8 addr,u16 val)45 static int ad5686_i2c_write(struct ad5686_state *st,
46 u8 cmd, u8 addr, u16 val)
47 {
48 struct i2c_client *i2c = to_i2c_client(st->dev);
49 int ret;
50
51 st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | AD5686_ADDR(addr)
52 | val);
53
54 ret = i2c_master_send(i2c, &st->data[0].d8[1], 3);
55 if (ret < 0)
56 return ret;
57
58 return (ret != 3) ? -EIO : 0;
59 }
60
ad5686_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)61 static int ad5686_i2c_probe(struct i2c_client *i2c,
62 const struct i2c_device_id *id)
63 {
64 return ad5686_probe(&i2c->dev, id->driver_data, id->name,
65 ad5686_i2c_write, ad5686_i2c_read);
66 }
67
ad5686_i2c_remove(struct i2c_client * i2c)68 static int ad5686_i2c_remove(struct i2c_client *i2c)
69 {
70 return ad5686_remove(&i2c->dev);
71 }
72
73 static const struct i2c_device_id ad5686_i2c_id[] = {
74 {"ad5311r", ID_AD5311R},
75 {"ad5671r", ID_AD5671R},
76 {"ad5675r", ID_AD5675R},
77 {"ad5691r", ID_AD5691R},
78 {"ad5692r", ID_AD5692R},
79 {"ad5693", ID_AD5693},
80 {"ad5693r", ID_AD5693R},
81 {"ad5694", ID_AD5694},
82 {"ad5694r", ID_AD5694R},
83 {"ad5695r", ID_AD5695R},
84 {"ad5696", ID_AD5696},
85 {"ad5696r", ID_AD5696R},
86 {}
87 };
88 MODULE_DEVICE_TABLE(i2c, ad5686_i2c_id);
89
90 static struct i2c_driver ad5686_i2c_driver = {
91 .driver = {
92 .name = "ad5696",
93 },
94 .probe = ad5686_i2c_probe,
95 .remove = ad5686_i2c_remove,
96 .id_table = ad5686_i2c_id,
97 };
98
99 module_i2c_driver(ad5686_i2c_driver);
100
101 MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
102 MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs");
103 MODULE_LICENSE("GPL v2");
104
