1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ADT7310/ADT7310 digital temperature sensor driver
*
* Copyright 2012-2013 Analog Devices Inc.
* Author: Lars-Peter Clausen <lars@metafoo.de>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
#include <asm/unaligned.h>
#include "adt7x10.h"
#define ADT7310_STATUS 0
#define ADT7310_CONFIG 1
#define ADT7310_TEMPERATURE 2
#define ADT7310_ID 3
#define ADT7310_T_CRIT 4
#define ADT7310_T_HYST 5
#define ADT7310_T_ALARM_HIGH 6
#define ADT7310_T_ALARM_LOW 7
static const u8 adt7310_reg_table[] = {
[ADT7X10_TEMPERATURE] = ADT7310_TEMPERATURE,
[ADT7X10_STATUS] = ADT7310_STATUS,
[ADT7X10_CONFIG] = ADT7310_CONFIG,
[ADT7X10_T_ALARM_HIGH] = ADT7310_T_ALARM_HIGH,
[ADT7X10_T_ALARM_LOW] = ADT7310_T_ALARM_LOW,
[ADT7X10_T_CRIT] = ADT7310_T_CRIT,
[ADT7X10_T_HYST] = ADT7310_T_HYST,
[ADT7X10_ID] = ADT7310_ID,
};
#define ADT7310_CMD_REG_OFFSET 3
#define ADT7310_CMD_READ 0x40
#define AD7310_COMMAND(reg) (adt7310_reg_table[(reg)] << ADT7310_CMD_REG_OFFSET)
static int adt7310_spi_read_word(struct spi_device *spi, u8 reg)
{
return spi_w8r16be(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
}
static int adt7310_spi_write_word(struct spi_device *spi, u8 reg, u16 data)
{
u8 buf[3];
buf[0] = AD7310_COMMAND(reg);
put_unaligned_be16(data, &buf[1]);
return spi_write(spi, buf, sizeof(buf));
}
static int adt7310_spi_read_byte(struct spi_device *spi, u8 reg)
{
return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
}
static int adt7310_spi_write_byte(struct spi_device *spi, u8 reg, u8 data)
{
u8 buf[2];
buf[0] = AD7310_COMMAND(reg);
buf[1] = data;
return spi_write(spi, buf, sizeof(buf));
}
static bool adt7310_regmap_is_volatile(struct device *dev, unsigned int reg)
{
switch (reg) {
case ADT7X10_TEMPERATURE:
case ADT7X10_STATUS:
return true;
default:
return false;
}
}
static int adt7310_reg_read(void *context, unsigned int reg, unsigned int *val)
{
struct spi_device *spi = context;
int regval;
switch (reg) {
case ADT7X10_TEMPERATURE:
case ADT7X10_T_ALARM_HIGH:
case ADT7X10_T_ALARM_LOW:
case ADT7X10_T_CRIT:
regval = adt7310_spi_read_word(spi, reg);
break;
default:
regval = adt7310_spi_read_byte(spi, reg);
break;
}
if (regval < 0)
return regval;
*val = regval;
return 0;
}
static int adt7310_reg_write(void *context, unsigned int reg, unsigned int val)
{
struct spi_device *spi = context;
int ret;
switch (reg) {
case ADT7X10_TEMPERATURE:
case ADT7X10_T_ALARM_HIGH:
case ADT7X10_T_ALARM_LOW:
case ADT7X10_T_CRIT:
ret = adt7310_spi_write_word(spi, reg, val);
break;
default:
ret = adt7310_spi_write_byte(spi, reg, val);
break;
}
return ret;
}
static const struct regmap_config adt7310_regmap_config = {
.reg_bits = 8,
.val_bits = 16,
.cache_type = REGCACHE_RBTREE,
.volatile_reg = adt7310_regmap_is_volatile,
.reg_read = adt7310_reg_read,
.reg_write = adt7310_reg_write,
};
static int adt7310_spi_probe(struct spi_device *spi)
{
struct regmap *regmap;
regmap = devm_regmap_init(&spi->dev, NULL, spi, &adt7310_regmap_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq,
regmap);
}
static const struct spi_device_id adt7310_id[] = {
{ "adt7310", 0 },
{ "adt7320", 0 },
{}
};
MODULE_DEVICE_TABLE(spi, adt7310_id);
static struct spi_driver adt7310_driver = {
.driver = {
.name = "adt7310",
.pm = ADT7X10_DEV_PM_OPS,
},
.probe = adt7310_spi_probe,
.id_table = adt7310_id,
};
module_spi_driver(adt7310_driver);
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("ADT7310/ADT7320 driver");
MODULE_LICENSE("GPL");
|
