treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
[sfrench/cifs-2.6.git] / drivers / hwmon / tmp103.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Texas Instruments TMP103 SMBus temperature sensor driver
4  * Copyright (C) 2014 Heiko Schocher <hs@denx.de>
5  *
6  * Based on:
7  * Texas Instruments TMP102 SMBus temperature sensor driver
8  *
9  * Copyright (C) 2010 Steven King <sfking@fdwdc.com>
10  */
11
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/slab.h>
15 #include <linux/i2c.h>
16 #include <linux/hwmon.h>
17 #include <linux/hwmon-sysfs.h>
18 #include <linux/err.h>
19 #include <linux/mutex.h>
20 #include <linux/device.h>
21 #include <linux/jiffies.h>
22 #include <linux/regmap.h>
23
24 #define TMP103_TEMP_REG         0x00
25 #define TMP103_CONF_REG         0x01
26 #define TMP103_TLOW_REG         0x02
27 #define TMP103_THIGH_REG        0x03
28
29 #define TMP103_CONF_M0          0x01
30 #define TMP103_CONF_M1          0x02
31 #define TMP103_CONF_LC          0x04
32 #define TMP103_CONF_FL          0x08
33 #define TMP103_CONF_FH          0x10
34 #define TMP103_CONF_CR0         0x20
35 #define TMP103_CONF_CR1         0x40
36 #define TMP103_CONF_ID          0x80
37 #define TMP103_CONF_SD          (TMP103_CONF_M1)
38 #define TMP103_CONF_SD_MASK     (TMP103_CONF_M0 | TMP103_CONF_M1)
39
40 #define TMP103_CONFIG           (TMP103_CONF_CR1 | TMP103_CONF_M1)
41 #define TMP103_CONFIG_MASK      (TMP103_CONF_CR0 | TMP103_CONF_CR1 | \
42                                  TMP103_CONF_M0 | TMP103_CONF_M1)
43
44 static inline int tmp103_reg_to_mc(s8 val)
45 {
46         return val * 1000;
47 }
48
49 static inline u8 tmp103_mc_to_reg(int val)
50 {
51         return DIV_ROUND_CLOSEST(val, 1000);
52 }
53
54 static ssize_t tmp103_temp_show(struct device *dev,
55                                 struct device_attribute *attr, char *buf)
56 {
57         struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
58         struct regmap *regmap = dev_get_drvdata(dev);
59         unsigned int regval;
60         int ret;
61
62         ret = regmap_read(regmap, sda->index, &regval);
63         if (ret < 0)
64                 return ret;
65
66         return sprintf(buf, "%d\n", tmp103_reg_to_mc(regval));
67 }
68
69 static ssize_t tmp103_temp_store(struct device *dev,
70                                  struct device_attribute *attr,
71                                  const char *buf, size_t count)
72 {
73         struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
74         struct regmap *regmap = dev_get_drvdata(dev);
75         long val;
76         int ret;
77
78         if (kstrtol(buf, 10, &val) < 0)
79                 return -EINVAL;
80
81         val = clamp_val(val, -55000, 127000);
82         ret = regmap_write(regmap, sda->index, tmp103_mc_to_reg(val));
83         return ret ? ret : count;
84 }
85
86 static SENSOR_DEVICE_ATTR_RO(temp1_input, tmp103_temp, TMP103_TEMP_REG);
87
88 static SENSOR_DEVICE_ATTR_RW(temp1_min, tmp103_temp, TMP103_TLOW_REG);
89
90 static SENSOR_DEVICE_ATTR_RW(temp1_max, tmp103_temp, TMP103_THIGH_REG);
91
92 static struct attribute *tmp103_attrs[] = {
93         &sensor_dev_attr_temp1_input.dev_attr.attr,
94         &sensor_dev_attr_temp1_min.dev_attr.attr,
95         &sensor_dev_attr_temp1_max.dev_attr.attr,
96         NULL
97 };
98 ATTRIBUTE_GROUPS(tmp103);
99
100 static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg)
101 {
102         return reg == TMP103_TEMP_REG;
103 }
104
105 static const struct regmap_config tmp103_regmap_config = {
106         .reg_bits = 8,
107         .val_bits = 8,
108         .max_register = TMP103_THIGH_REG,
109         .volatile_reg = tmp103_regmap_is_volatile,
110 };
111
112 static int tmp103_probe(struct i2c_client *client,
113                         const struct i2c_device_id *id)
114 {
115         struct device *dev = &client->dev;
116         struct device *hwmon_dev;
117         struct regmap *regmap;
118         int ret;
119
120         regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config);
121         if (IS_ERR(regmap)) {
122                 dev_err(dev, "failed to allocate register map\n");
123                 return PTR_ERR(regmap);
124         }
125
126         ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK,
127                                  TMP103_CONFIG);
128         if (ret < 0) {
129                 dev_err(&client->dev, "error writing config register\n");
130                 return ret;
131         }
132
133         i2c_set_clientdata(client, regmap);
134         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
135                                                       regmap, tmp103_groups);
136         return PTR_ERR_OR_ZERO(hwmon_dev);
137 }
138
139 static int __maybe_unused tmp103_suspend(struct device *dev)
140 {
141         struct regmap *regmap = dev_get_drvdata(dev);
142
143         return regmap_update_bits(regmap, TMP103_CONF_REG,
144                                   TMP103_CONF_SD_MASK, 0);
145 }
146
147 static int __maybe_unused tmp103_resume(struct device *dev)
148 {
149         struct regmap *regmap = dev_get_drvdata(dev);
150
151         return regmap_update_bits(regmap, TMP103_CONF_REG,
152                                   TMP103_CONF_SD_MASK, TMP103_CONF_SD);
153 }
154
155 static SIMPLE_DEV_PM_OPS(tmp103_dev_pm_ops, tmp103_suspend, tmp103_resume);
156
157 static const struct i2c_device_id tmp103_id[] = {
158         { "tmp103", 0 },
159         { }
160 };
161 MODULE_DEVICE_TABLE(i2c, tmp103_id);
162
163 static const struct of_device_id __maybe_unused tmp103_of_match[] = {
164         { .compatible = "ti,tmp103" },
165         { },
166 };
167 MODULE_DEVICE_TABLE(of, tmp103_of_match);
168
169 static struct i2c_driver tmp103_driver = {
170         .driver = {
171                 .name   = "tmp103",
172                 .of_match_table = of_match_ptr(tmp103_of_match),
173                 .pm     = &tmp103_dev_pm_ops,
174         },
175         .probe          = tmp103_probe,
176         .id_table       = tmp103_id,
177 };
178
179 module_i2c_driver(tmp103_driver);
180
181 MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
182 MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
183 MODULE_LICENSE("GPL");