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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
/*
* Texas Instruments TMP103 SMBus temperature sensor driver
* Copyright (C) 2014 Heiko Schocher <hs@denx.de>
*
* Based on:
* Texas Instruments TMP102 SMBus temperature sensor driver
*
* Copyright (C) 2010 Steven King <sfking@fdwdc.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/jiffies.h>
#include <linux/regmap.h>
#define TMP103_TEMP_REG 0x00
#define TMP103_CONF_REG 0x01
#define TMP103_TLOW_REG 0x02
#define TMP103_THIGH_REG 0x03
#define TMP103_CONF_M0 0x01
#define TMP103_CONF_M1 0x02
#define TMP103_CONF_LC 0x04
#define TMP103_CONF_FL 0x08
#define TMP103_CONF_FH 0x10
#define TMP103_CONF_CR0 0x20
#define TMP103_CONF_CR1 0x40
#define TMP103_CONF_ID 0x80
#define TMP103_CONF_SD (TMP103_CONF_M1)
#define TMP103_CONF_SD_MASK (TMP103_CONF_M0 | TMP103_CONF_M1)
#define TMP103_CONFIG (TMP103_CONF_CR1 | TMP103_CONF_M1)
#define TMP103_CONFIG_MASK (TMP103_CONF_CR0 | TMP103_CONF_CR1 | \
TMP103_CONF_M0 | TMP103_CONF_M1)
static inline int tmp103_reg_to_mc(s8 val)
{
return val * 1000;
}
static inline u8 tmp103_mc_to_reg(int val)
{
return DIV_ROUND_CLOSEST(val, 1000);
}
static ssize_t tmp103_show_temp(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
struct regmap *regmap = dev_get_drvdata(dev);
unsigned int regval;
int ret;
ret = regmap_read(regmap, sda->index, ®val);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", tmp103_reg_to_mc(regval));
}
static ssize_t tmp103_set_temp(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
struct regmap *regmap = dev_get_drvdata(dev);
long val;
int ret;
if (kstrtol(buf, 10, &val) < 0)
return -EINVAL;
val = clamp_val(val, -55000, 127000);
ret = regmap_write(regmap, sda->index, tmp103_mc_to_reg(val));
return ret ? ret : count;
}
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp103_show_temp, NULL ,
TMP103_TEMP_REG);
static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, tmp103_show_temp,
tmp103_set_temp, TMP103_TLOW_REG);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp103_show_temp,
tmp103_set_temp, TMP103_THIGH_REG);
static struct attribute *tmp103_attrs[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp1_min.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
NULL
};
ATTRIBUTE_GROUPS(tmp103);
static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg)
{
return reg == TMP103_TEMP_REG;
}
static const struct regmap_config tmp103_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = TMP103_THIGH_REG,
.volatile_reg = tmp103_regmap_is_volatile,
};
static int tmp103_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
struct device *hwmon_dev;
struct regmap *regmap;
int ret;
regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config);
if (IS_ERR(regmap)) {
dev_err(dev, "failed to allocate register map\n");
return PTR_ERR(regmap);
}
ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK,
TMP103_CONFIG);
if (ret < 0) {
dev_err(&client->dev, "error writing config register\n");
return ret;
}
i2c_set_clientdata(client, regmap);
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
regmap, tmp103_groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static int __maybe_unused tmp103_suspend(struct device *dev)
{
struct regmap *regmap = dev_get_drvdata(dev);
return regmap_update_bits(regmap, TMP103_CONF_REG,
TMP103_CONF_SD_MASK, 0);
}
static int __maybe_unused tmp103_resume(struct device *dev)
{
struct regmap *regmap = dev_get_drvdata(dev);
return regmap_update_bits(regmap, TMP103_CONF_REG,
TMP103_CONF_SD_MASK, TMP103_CONF_SD);
}
static SIMPLE_DEV_PM_OPS(tmp103_dev_pm_ops, tmp103_suspend, tmp103_resume);
static const struct i2c_device_id tmp103_id[] = {
{ "tmp103", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tmp103_id);
static const struct of_device_id tmp103_of_match[] = {
{ .compatible = "ti,tmp103" },
{ },
};
MODULE_DEVICE_TABLE(of, tmp103_of_match);
static struct i2c_driver tmp103_driver = {
.driver = {
.name = "tmp103",
.of_match_table = of_match_ptr(tmp103_of_match),
.pm = &tmp103_dev_pm_ops,
},
.probe = tmp103_probe,
.id_table = tmp103_id,
};
module_i2c_driver(tmp103_driver);
MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
MODULE_LICENSE("GPL");
|
