1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * I2C driver for AD5696 and similar Digital to Analog Converters
4 *
5 * Copyright 2018 Analog Devices Inc.
6 */
7
8 #include <linux/bitfield.h>
9 #include <linux/errno.h>
10 #include <linux/i2c.h>
11 #include <linux/module.h>
12
13 #include <asm/byteorder.h>
14
15 #include "ad5686.h"
16
ad5686_i2c_read(struct ad5686_state * st,u8 addr)17 static int ad5686_i2c_read(struct ad5686_state *st, u8 addr)
18 {
19 struct i2c_client *i2c = to_i2c_client(st->dev);
20 struct i2c_msg msg[2] = {
21 {
22 .addr = i2c->addr,
23 .flags = i2c->flags,
24 .len = 3,
25 .buf = &st->data[0].d8[1],
26 },
27 {
28 .addr = i2c->addr,
29 .flags = i2c->flags | I2C_M_RD,
30 .len = 2,
31 .buf = (char *)&st->data[0].d16,
32 },
33 };
34 int ret;
35
36 st->data[0].d32 = cpu_to_be32(FIELD_PREP(AD5686_CMD_MSK, AD5686_CMD_NOOP) |
37 FIELD_PREP(AD5686_ADDR_MSK, addr));
38
39 ret = i2c_transfer(i2c->adapter, msg, 2);
40 if (ret < 0)
41 return ret;
42
43 return be16_to_cpu(st->data[0].d16);
44 }
45
ad5686_i2c_write(struct ad5686_state * st,u8 cmd,u8 addr,u16 val)46 static int ad5686_i2c_write(struct ad5686_state *st,
47 u8 cmd, u8 addr, u16 val)
48 {
49 struct i2c_client *i2c = to_i2c_client(st->dev);
50 int ret;
51
52 st->data[0].d32 = cpu_to_be32(FIELD_PREP(AD5686_CMD_MSK, cmd) |
53 FIELD_PREP(AD5686_ADDR_MSK, addr) |
54 FIELD_PREP(AD5686_DATA_MSK, val));
55
56 ret = i2c_master_send(i2c, &st->data[0].d8[1], 3);
57 if (ret < 0)
58 return ret;
59
60 return (ret != 3) ? -EIO : 0;
61 }
62
63 static const struct ad5686_bus_ops ad5686_i2c_ops = {
64 .write = ad5686_i2c_write,
65 .read = ad5686_i2c_read,
66 };
67
ad5686_i2c_probe(struct i2c_client * i2c)68 static int ad5686_i2c_probe(struct i2c_client *i2c)
69 {
70 const struct ad5686_chip_info *info;
71
72 info = i2c_get_match_data(i2c);
73 if (!info)
74 return -ENODATA;
75
76 return ad5686_probe(&i2c->dev, info, i2c->name, &ad5686_i2c_ops, NULL);
77 }
78
79 static const struct i2c_device_id ad5686_i2c_id[] = {
80 { .name = "ad5311r", .driver_data = (kernel_ulong_t)&ad5311r_chip_info },
81 { .name = "ad5316r", .driver_data = (kernel_ulong_t)&ad5317r_chip_info },
82 { .name = "ad5337r", .driver_data = (kernel_ulong_t)&ad5337r_chip_info },
83 { .name = "ad5338r", .driver_data = (kernel_ulong_t)&ad5338r_chip_info },
84 { .name = "ad5671r", .driver_data = (kernel_ulong_t)&ad5672r_chip_info },
85 { .name = "ad5673r", .driver_data = (kernel_ulong_t)&ad5674r_chip_info },
86 { .name = "ad5675", .driver_data = (kernel_ulong_t)&ad5676_chip_info },
87 { .name = "ad5675r", .driver_data = (kernel_ulong_t)&ad5676r_chip_info },
88 { .name = "ad5677r", .driver_data = (kernel_ulong_t)&ad5679r_chip_info },
89 { .name = "ad5691r", .driver_data = (kernel_ulong_t)&ad5681r_chip_info },
90 { .name = "ad5692r", .driver_data = (kernel_ulong_t)&ad5682r_chip_info },
91 { .name = "ad5693", .driver_data = (kernel_ulong_t)&ad5683_chip_info },
92 { .name = "ad5693r", .driver_data = (kernel_ulong_t)&ad5683r_chip_info },
93 { .name = "ad5694", .driver_data = (kernel_ulong_t)&ad5684_chip_info },
94 { .name = "ad5694r", .driver_data = (kernel_ulong_t)&ad5684r_chip_info },
95 { .name = "ad5695r", .driver_data = (kernel_ulong_t)&ad5685r_chip_info },
96 { .name = "ad5696", .driver_data = (kernel_ulong_t)&ad5686_chip_info },
97 { .name = "ad5696r", .driver_data = (kernel_ulong_t)&ad5686r_chip_info },
98 { .name = "ad5697r", .driver_data = (kernel_ulong_t)&ad5687r_chip_info },
99 { }
100 };
101 MODULE_DEVICE_TABLE(i2c, ad5686_i2c_id);
102
103 static const struct of_device_id ad5686_of_match[] = {
104 { .compatible = "adi,ad5311r", .data = &ad5311r_chip_info },
105 { .compatible = "adi,ad5316r", .data = &ad5317r_chip_info },
106 { .compatible = "adi,ad5337r", .data = &ad5337r_chip_info },
107 { .compatible = "adi,ad5338r", .data = &ad5338r_chip_info },
108 { .compatible = "adi,ad5671r", .data = &ad5672r_chip_info },
109 { .compatible = "adi,ad5673r", .data = &ad5674r_chip_info },
110 { .compatible = "adi,ad5675", .data = &ad5676_chip_info },
111 { .compatible = "adi,ad5675r", .data = &ad5676r_chip_info },
112 { .compatible = "adi,ad5677r", .data = &ad5679r_chip_info },
113 { .compatible = "adi,ad5691r", .data = &ad5681r_chip_info },
114 { .compatible = "adi,ad5692r", .data = &ad5682r_chip_info },
115 { .compatible = "adi,ad5693", .data = &ad5683_chip_info },
116 { .compatible = "adi,ad5693r", .data = &ad5683r_chip_info },
117 { .compatible = "adi,ad5694", .data = &ad5684_chip_info },
118 { .compatible = "adi,ad5694r", .data = &ad5684r_chip_info },
119 { .compatible = "adi,ad5695r", .data = &ad5685r_chip_info },
120 { .compatible = "adi,ad5696", .data = &ad5686_chip_info },
121 { .compatible = "adi,ad5696r", .data = &ad5686r_chip_info },
122 { .compatible = "adi,ad5697r", .data = &ad5687r_chip_info },
123 { }
124 };
125 MODULE_DEVICE_TABLE(of, ad5686_of_match);
126
127 static struct i2c_driver ad5686_i2c_driver = {
128 .driver = {
129 .name = "ad5696",
130 .of_match_table = ad5686_of_match,
131 },
132 .probe = ad5686_i2c_probe,
133 .id_table = ad5686_i2c_id,
134 };
135
136 module_i2c_driver(ad5686_i2c_driver);
137
138 MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
139 MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs");
140 MODULE_LICENSE("GPL v2");
141 MODULE_IMPORT_NS("IIO_AD5686");
142