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Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * AD5593R Digital <-> Analog converters driver
4 *
5 * Copyright 2015-2016 Analog Devices Inc.
6 * Author: Paul Cercueil <paul.cercueil@analog.com>
7 */
8
9#include "ad5592r-base.h"
10
11#include <linux/bitops.h>
12#include <linux/i2c.h>
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/acpi.h>
16
17#define AD5593R_MODE_CONF (0 << 4)
18#define AD5593R_MODE_DAC_WRITE (1 << 4)
19#define AD5593R_MODE_ADC_READBACK (4 << 4)
20#define AD5593R_MODE_DAC_READBACK (5 << 4)
21#define AD5593R_MODE_GPIO_READBACK (6 << 4)
22#define AD5593R_MODE_REG_READBACK (7 << 4)
23
24static int ad5593r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value)
25{
26 struct i2c_client *i2c = to_i2c_client(st->dev);
27
28 return i2c_smbus_write_word_swapped(i2c,
29 AD5593R_MODE_DAC_WRITE | chan, value);
30}
31
32static int ad5593r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value)
33{
34 struct i2c_client *i2c = to_i2c_client(st->dev);
35 s32 val;
36
37 val = i2c_smbus_write_word_swapped(i2c,
38 AD5593R_MODE_CONF | AD5592R_REG_ADC_SEQ, BIT(chan));
39 if (val < 0)
40 return (int) val;
41
42 val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_ADC_READBACK);
43 if (val < 0)
44 return (int) val;
45
46 *value = (u16) val;
47
48 return 0;
49}
50
51static int ad5593r_reg_write(struct ad5592r_state *st, u8 reg, u16 value)
52{
53 struct i2c_client *i2c = to_i2c_client(st->dev);
54
55 return i2c_smbus_write_word_swapped(i2c,
56 AD5593R_MODE_CONF | reg, value);
57}
58
59static int ad5593r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value)
60{
61 struct i2c_client *i2c = to_i2c_client(st->dev);
62 s32 val;
63
64 val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_REG_READBACK | reg);
65 if (val < 0)
66 return (int) val;
67
68 *value = (u16) val;
69
70 return 0;
71}
72
73static int ad5593r_gpio_read(struct ad5592r_state *st, u8 *value)
74{
75 struct i2c_client *i2c = to_i2c_client(st->dev);
76 s32 val;
77
78 val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_GPIO_READBACK);
79 if (val < 0)
80 return (int) val;
81
82 *value = (u8) val;
83
84 return 0;
85}
86
87static const struct ad5592r_rw_ops ad5593r_rw_ops = {
88 .write_dac = ad5593r_write_dac,
89 .read_adc = ad5593r_read_adc,
90 .reg_write = ad5593r_reg_write,
91 .reg_read = ad5593r_reg_read,
92 .gpio_read = ad5593r_gpio_read,
93};
94
95static int ad5593r_i2c_probe(struct i2c_client *i2c,
96 const struct i2c_device_id *id)
97{
98 return ad5592r_probe(&i2c->dev, id->name, &ad5593r_rw_ops);
99}
100
101static int ad5593r_i2c_remove(struct i2c_client *i2c)
102{
103 return ad5592r_remove(&i2c->dev);
104}
105
106static const struct i2c_device_id ad5593r_i2c_ids[] = {
107 { .name = "ad5593r", },
108 {},
109};
110MODULE_DEVICE_TABLE(i2c, ad5593r_i2c_ids);
111
112static const struct of_device_id ad5593r_of_match[] = {
113 { .compatible = "adi,ad5593r", },
114 {},
115};
116MODULE_DEVICE_TABLE(of, ad5593r_of_match);
117
118static const struct acpi_device_id ad5593r_acpi_match[] = {
119 {"ADS5593", },
120 { },
121};
122MODULE_DEVICE_TABLE(acpi, ad5593r_acpi_match);
123
124static struct i2c_driver ad5593r_driver = {
125 .driver = {
126 .name = "ad5593r",
127 .of_match_table = of_match_ptr(ad5593r_of_match),
128 .acpi_match_table = ACPI_PTR(ad5593r_acpi_match),
129 },
130 .probe = ad5593r_i2c_probe,
131 .remove = ad5593r_i2c_remove,
132 .id_table = ad5593r_i2c_ids,
133};
134module_i2c_driver(ad5593r_driver);
135
136MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>");
137MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters");
138MODULE_LICENSE("GPL v2");