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/mod_devicetable.h>
15
16#include <linux/unaligned.h>
17
18#define AD5593R_MODE_CONF (0 << 4)
19#define AD5593R_MODE_DAC_WRITE (1 << 4)
20#define AD5593R_MODE_ADC_READBACK (4 << 4)
21#define AD5593R_MODE_DAC_READBACK (5 << 4)
22#define AD5593R_MODE_GPIO_READBACK (6 << 4)
23#define AD5593R_MODE_REG_READBACK (7 << 4)
24
25static int ad5593r_read_word(struct i2c_client *i2c, u8 reg, u16 *value)
26{
27 int ret;
28 u8 buf[2];
29
30 ret = i2c_smbus_write_byte(client: i2c, value: reg);
31 if (ret < 0)
32 return ret;
33
34 ret = i2c_master_recv(client: i2c, buf, count: sizeof(buf));
35 if (ret < 0)
36 return ret;
37
38 *value = get_unaligned_be16(p: buf);
39
40 return 0;
41}
42
43static int ad5593r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value)
44{
45 struct i2c_client *i2c = to_i2c_client(st->dev);
46
47 return i2c_smbus_write_word_swapped(client: i2c,
48 AD5593R_MODE_DAC_WRITE | chan, value);
49}
50
51static int ad5593r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value)
52{
53 struct i2c_client *i2c = to_i2c_client(st->dev);
54 s32 val;
55
56 val = i2c_smbus_write_word_swapped(client: i2c,
57 AD5593R_MODE_CONF | AD5592R_REG_ADC_SEQ, BIT(chan));
58 if (val < 0)
59 return (int) val;
60
61 return ad5593r_read_word(i2c, AD5593R_MODE_ADC_READBACK, value);
62}
63
64static int ad5593r_reg_write(struct ad5592r_state *st, u8 reg, u16 value)
65{
66 struct i2c_client *i2c = to_i2c_client(st->dev);
67
68 return i2c_smbus_write_word_swapped(client: i2c,
69 AD5593R_MODE_CONF | reg, value);
70}
71
72static int ad5593r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value)
73{
74 struct i2c_client *i2c = to_i2c_client(st->dev);
75
76 return ad5593r_read_word(i2c, AD5593R_MODE_REG_READBACK | reg, value);
77}
78
79static int ad5593r_gpio_read(struct ad5592r_state *st, u8 *value)
80{
81 struct i2c_client *i2c = to_i2c_client(st->dev);
82 u16 val;
83 int ret;
84
85 ret = ad5593r_read_word(i2c, AD5593R_MODE_GPIO_READBACK, value: &val);
86 if (ret)
87 return ret;
88
89 *value = (u8) val;
90
91 return 0;
92}
93
94static const struct ad5592r_rw_ops ad5593r_rw_ops = {
95 .write_dac = ad5593r_write_dac,
96 .read_adc = ad5593r_read_adc,
97 .reg_write = ad5593r_reg_write,
98 .reg_read = ad5593r_reg_read,
99 .gpio_read = ad5593r_gpio_read,
100};
101
102static int ad5593r_i2c_probe(struct i2c_client *i2c)
103{
104 const struct i2c_device_id *id = i2c_client_get_device_id(client: i2c);
105 if (!i2c_check_functionality(adap: i2c->adapter,
106 I2C_FUNC_SMBUS_BYTE | I2C_FUNC_I2C))
107 return -EOPNOTSUPP;
108
109 return ad5592r_probe(dev: &i2c->dev, name: id->name, ops: &ad5593r_rw_ops);
110}
111
112static void ad5593r_i2c_remove(struct i2c_client *i2c)
113{
114 ad5592r_remove(dev: &i2c->dev);
115}
116
117static const struct i2c_device_id ad5593r_i2c_ids[] = {
118 { .name = "ad5593r", },
119 { }
120};
121MODULE_DEVICE_TABLE(i2c, ad5593r_i2c_ids);
122
123static const struct of_device_id ad5593r_of_match[] = {
124 { .compatible = "adi,ad5593r", },
125 { }
126};
127MODULE_DEVICE_TABLE(of, ad5593r_of_match);
128
129static const struct acpi_device_id ad5593r_acpi_match[] = {
130 {"ADS5593", },
131 { }
132};
133MODULE_DEVICE_TABLE(acpi, ad5593r_acpi_match);
134
135static struct i2c_driver ad5593r_driver = {
136 .driver = {
137 .name = "ad5593r",
138 .of_match_table = ad5593r_of_match,
139 .acpi_match_table = ad5593r_acpi_match,
140 },
141 .probe = ad5593r_i2c_probe,
142 .remove = ad5593r_i2c_remove,
143 .id_table = ad5593r_i2c_ids,
144};
145module_i2c_driver(ad5593r_driver);
146
147MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>");
148MODULE_DESCRIPTION("Analog Devices AD5593R multi-channel converters");
149MODULE_LICENSE("GPL v2");
150MODULE_IMPORT_NS("IIO_AD5592R");
151

source code of linux/drivers/iio/dac/ad5593r.c