Linux 4.16.11
[linux/fpc-iii.git] / drivers / hwmon / tmp103.c
blob7f85b14544df843b54cdc54b9fb3f3da2474ec94
1 /*
2 * Texas Instruments TMP103 SMBus temperature sensor driver
3 * Copyright (C) 2014 Heiko Schocher <hs@denx.de>
5 * Based on:
6 * Texas Instruments TMP102 SMBus temperature sensor driver
8 * Copyright (C) 2010 Steven King <sfking@fdwdc.com>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
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>
34 #define TMP103_TEMP_REG 0x00
35 #define TMP103_CONF_REG 0x01
36 #define TMP103_TLOW_REG 0x02
37 #define TMP103_THIGH_REG 0x03
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)
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)
54 static inline int tmp103_reg_to_mc(s8 val)
56 return val * 1000;
59 static inline u8 tmp103_mc_to_reg(int val)
61 return DIV_ROUND_CLOSEST(val, 1000);
64 static ssize_t tmp103_show_temp(struct device *dev,
65 struct device_attribute *attr,
66 char *buf)
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;
73 ret = regmap_read(regmap, sda->index, &regval);
74 if (ret < 0)
75 return ret;
77 return sprintf(buf, "%d\n", tmp103_reg_to_mc(regval));
80 static ssize_t tmp103_set_temp(struct device *dev,
81 struct device_attribute *attr,
82 const char *buf, size_t count)
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;
89 if (kstrtol(buf, 10, &val) < 0)
90 return -EINVAL;
92 val = clamp_val(val, -55000, 127000);
93 ret = regmap_write(regmap, sda->index, tmp103_mc_to_reg(val));
94 return ret ? ret : count;
97 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp103_show_temp, NULL ,
98 TMP103_TEMP_REG);
100 static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, tmp103_show_temp,
101 tmp103_set_temp, TMP103_TLOW_REG);
103 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp103_show_temp,
104 tmp103_set_temp, TMP103_THIGH_REG);
106 static 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
112 ATTRIBUTE_GROUPS(tmp103);
114 static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg)
116 return reg == TMP103_TEMP_REG;
119 static 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,
126 static int tmp103_probe(struct i2c_client *client,
127 const struct i2c_device_id *id)
129 struct device *dev = &client->dev;
130 struct device *hwmon_dev;
131 struct regmap *regmap;
132 int ret;
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);
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;
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);
153 static int __maybe_unused tmp103_suspend(struct device *dev)
155 struct regmap *regmap = dev_get_drvdata(dev);
157 return regmap_update_bits(regmap, TMP103_CONF_REG,
158 TMP103_CONF_SD_MASK, 0);
161 static int __maybe_unused tmp103_resume(struct device *dev)
163 struct regmap *regmap = dev_get_drvdata(dev);
165 return regmap_update_bits(regmap, TMP103_CONF_REG,
166 TMP103_CONF_SD_MASK, TMP103_CONF_SD);
169 static SIMPLE_DEV_PM_OPS(tmp103_dev_pm_ops, tmp103_suspend, tmp103_resume);
171 static const struct i2c_device_id tmp103_id[] = {
172 { "tmp103", 0 },
175 MODULE_DEVICE_TABLE(i2c, tmp103_id);
177 static const struct of_device_id tmp103_of_match[] = {
178 { .compatible = "ti,tmp103" },
179 { },
181 MODULE_DEVICE_TABLE(of, tmp103_of_match);
183 static struct i2c_driver tmp103_driver = {
184 .driver = {
185 .name = "tmp103",
186 .of_match_table = of_match_ptr(tmp103_of_match),
187 .pm = &tmp103_dev_pm_ops,
189 .probe = tmp103_probe,
190 .id_table = tmp103_id,
193 module_i2c_driver(tmp103_driver);
195 MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
196 MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
197 MODULE_LICENSE("GPL");