1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22#include <linux/module.h>
23#include <linux/init.h>
24#include <linux/slab.h>
25#include <linux/i2c.h>
26#include <linux/hwmon.h>
27#include <linux/hwmon-sysfs.h>
28#include <linux/err.h>
29#include <linux/mutex.h>
30#include <linux/device.h>
31#include <linux/jiffies.h>
32#include <linux/regmap.h>
33
34#define TMP103_TEMP_REG 0x00
35#define TMP103_CONF_REG 0x01
36#define TMP103_TLOW_REG 0x02
37#define TMP103_THIGH_REG 0x03
38
39#define TMP103_CONF_M0 0x01
40#define TMP103_CONF_M1 0x02
41#define TMP103_CONF_LC 0x04
42#define TMP103_CONF_FL 0x08
43#define TMP103_CONF_FH 0x10
44#define TMP103_CONF_CR0 0x20
45#define TMP103_CONF_CR1 0x40
46#define TMP103_CONF_ID 0x80
47#define TMP103_CONF_SD (TMP103_CONF_M1)
48#define TMP103_CONF_SD_MASK (TMP103_CONF_M0 | TMP103_CONF_M1)
49
50#define TMP103_CONFIG (TMP103_CONF_CR1 | TMP103_CONF_M1)
51#define TMP103_CONFIG_MASK (TMP103_CONF_CR0 | TMP103_CONF_CR1 | \
52 TMP103_CONF_M0 | TMP103_CONF_M1)
53
54static inline int tmp103_reg_to_mc(s8 val)
55{
56 return val * 1000;
57}
58
59static inline u8 tmp103_mc_to_reg(int val)
60{
61 return DIV_ROUND_CLOSEST(val, 1000);
62}
63
64static ssize_t tmp103_show_temp(struct device *dev,
65 struct device_attribute *attr,
66 char *buf)
67{
68 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
69 struct regmap *regmap = dev_get_drvdata(dev);
70 unsigned int regval;
71 int ret;
72
73 ret = regmap_read(regmap, sda->index, ®val);
74 if (ret < 0)
75 return ret;
76
77 return sprintf(buf, "%d\n", tmp103_reg_to_mc(regval));
78}
79
80static ssize_t tmp103_set_temp(struct device *dev,
81 struct device_attribute *attr,
82 const char *buf, size_t count)
83{
84 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
85 struct regmap *regmap = dev_get_drvdata(dev);
86 long val;
87 int ret;
88
89 if (kstrtol(buf, 10, &val) < 0)
90 return -EINVAL;
91
92 val = clamp_val(val, -55000, 127000);
93 ret = regmap_write(regmap, sda->index, tmp103_mc_to_reg(val));
94 return ret ? ret : count;
95}
96
97static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp103_show_temp, NULL ,
98 TMP103_TEMP_REG);
99
100static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, tmp103_show_temp,
101 tmp103_set_temp, TMP103_TLOW_REG);
102
103static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp103_show_temp,
104 tmp103_set_temp, TMP103_THIGH_REG);
105
106static struct attribute *tmp103_attrs[] = {
107 &sensor_dev_attr_temp1_input.dev_attr.attr,
108 &sensor_dev_attr_temp1_min.dev_attr.attr,
109 &sensor_dev_attr_temp1_max.dev_attr.attr,
110 NULL
111};
112ATTRIBUTE_GROUPS(tmp103);
113
114static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg)
115{
116 return reg == TMP103_TEMP_REG;
117}
118
119static const struct regmap_config tmp103_regmap_config = {
120 .reg_bits = 8,
121 .val_bits = 8,
122 .max_register = TMP103_THIGH_REG,
123 .volatile_reg = tmp103_regmap_is_volatile,
124};
125
126static int tmp103_probe(struct i2c_client *client,
127 const struct i2c_device_id *id)
128{
129 struct device *dev = &client->dev;
130 struct device *hwmon_dev;
131 struct regmap *regmap;
132 int ret;
133
134 regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config);
135 if (IS_ERR(regmap)) {
136 dev_err(dev, "failed to allocate register map\n");
137 return PTR_ERR(regmap);
138 }
139
140 ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK,
141 TMP103_CONFIG);
142 if (ret < 0) {
143 dev_err(&client->dev, "error writing config register\n");
144 return ret;
145 }
146
147 i2c_set_clientdata(client, regmap);
148 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
149 regmap, tmp103_groups);
150 return PTR_ERR_OR_ZERO(hwmon_dev);
151}
152
153#ifdef CONFIG_PM
154static int tmp103_suspend(struct device *dev)
155{
156 struct regmap *regmap = dev_get_drvdata(dev);
157
158 return regmap_update_bits(regmap, TMP103_CONF_REG,
159 TMP103_CONF_SD_MASK, 0);
160}
161
162static int tmp103_resume(struct device *dev)
163{
164 struct regmap *regmap = dev_get_drvdata(dev);
165
166 return regmap_update_bits(regmap, TMP103_CONF_REG,
167 TMP103_CONF_SD_MASK, TMP103_CONF_SD);
168}
169
170static const struct dev_pm_ops tmp103_dev_pm_ops = {
171 .suspend = tmp103_suspend,
172 .resume = tmp103_resume,
173};
174
175#define TMP103_DEV_PM_OPS (&tmp103_dev_pm_ops)
176#else
177#define TMP103_DEV_PM_OPS NULL
178#endif
179
180static const struct i2c_device_id tmp103_id[] = {
181 { "tmp103", 0 },
182 { }
183};
184MODULE_DEVICE_TABLE(i2c, tmp103_id);
185
186static struct i2c_driver tmp103_driver = {
187 .driver = {
188 .name = "tmp103",
189 .pm = TMP103_DEV_PM_OPS,
190 },
191 .probe = tmp103_probe,
192 .id_table = tmp103_id,
193};
194
195module_i2c_driver(tmp103_driver);
196
197MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
198MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
199MODULE_LICENSE("GPL");
200
