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 <asm/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(i2c, reg);
31	if (ret < 0)
32		return ret;
33
34	ret = i2c_master_recv(i2c, buf, sizeof(buf));
35	if (ret < 0)
36		return ret;
37
38	*value = get_unaligned_be16(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(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(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(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, &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		const struct i2c_device_id *id)
104{
105	return ad5592r_probe(&i2c->dev, id->name, &ad5593r_rw_ops);
106}
107
108static int ad5593r_i2c_remove(struct i2c_client *i2c)
109{
110	return ad5592r_remove(&i2c->dev);
111}
112
113static const struct i2c_device_id ad5593r_i2c_ids[] = {
114	{ .name = "ad5593r", },
115	{},
116};
117MODULE_DEVICE_TABLE(i2c, ad5593r_i2c_ids);
118
119static const struct of_device_id ad5593r_of_match[] = {
120	{ .compatible = "adi,ad5593r", },
121	{},
122};
123MODULE_DEVICE_TABLE(of, ad5593r_of_match);
124
125static const struct acpi_device_id ad5593r_acpi_match[] = {
126	{"ADS5593", },
127	{ },
128};
129MODULE_DEVICE_TABLE(acpi, ad5593r_acpi_match);
130
131static struct i2c_driver ad5593r_driver = {
132	.driver = {
133		.name = "ad5593r",
134		.of_match_table = ad5593r_of_match,
135		.acpi_match_table = ad5593r_acpi_match,
136	},
137	.probe = ad5593r_i2c_probe,
138	.remove = ad5593r_i2c_remove,
139	.id_table = ad5593r_i2c_ids,
140};
141module_i2c_driver(ad5593r_driver);
142
143MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>");
144MODULE_DESCRIPTION("Analog Devices AD5593R multi-channel converters");
145MODULE_LICENSE("GPL v2");
146