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
ad5593r_read_word(struct i2c_client * i2c,u8 reg,u16 * value)25 static 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
ad5593r_write_dac(struct ad5592r_state * st,unsigned chan,u16 value)43 static 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
ad5593r_read_adc(struct ad5592r_state * st,unsigned chan,u16 * value)51 static 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
ad5593r_reg_write(struct ad5592r_state * st,u8 reg,u16 value)64 static 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
ad5593r_reg_read(struct ad5592r_state * st,u8 reg,u16 * value)72 static 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
ad5593r_gpio_read(struct ad5592r_state * st,u8 * value)79 static 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
94 static 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
ad5593r_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)102 static 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
ad5593r_i2c_remove(struct i2c_client * i2c)108 static int ad5593r_i2c_remove(struct i2c_client *i2c)
109 {
110 return ad5592r_remove(&i2c->dev);
111 }
112
113 static const struct i2c_device_id ad5593r_i2c_ids[] = {
114 { .name = "ad5593r", },
115 {},
116 };
117 MODULE_DEVICE_TABLE(i2c, ad5593r_i2c_ids);
118
119 static const struct of_device_id ad5593r_of_match[] = {
120 { .compatible = "adi,ad5593r", },
121 {},
122 };
123 MODULE_DEVICE_TABLE(of, ad5593r_of_match);
124
125 static const struct acpi_device_id ad5593r_acpi_match[] = {
126 {"ADS5593", },
127 { },
128 };
129 MODULE_DEVICE_TABLE(acpi, ad5593r_acpi_match);
130
131 static 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 };
141 module_i2c_driver(ad5593r_driver);
142
143 MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>");
144 MODULE_DESCRIPTION("Analog Devices AD5593R multi-channel converters");
145 MODULE_LICENSE("GPL v2");
146