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linux
1/*
2 * Texas Instruments TMP103 SMBus temperature sensor driver
3 * Copyright (C) 2014 Heiko Schocher <hs@denx.de>
4 *
5 * Based on:
6 * Texas Instruments TMP102 SMBus temperature sensor driver
7 *
8 * Copyright (C) 2010 Steven King <sfking@fdwdc.com>
9 *
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.
14 *
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.
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_temp_show(struct device *dev,
65 struct device_attribute *attr, char *buf)
66{
67 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
68 struct regmap *regmap = dev_get_drvdata(dev);
69 unsigned int regval;
70 int ret;
71
72 ret = regmap_read(regmap, sda->index, ®val);
73 if (ret < 0)
74 return ret;
75
76 return sprintf(buf, "%d\n", tmp103_reg_to_mc(regval));
77}
78
79static ssize_t tmp103_temp_store(struct device *dev,
80 struct device_attribute *attr,
81 const char *buf, size_t count)
82{
83 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
84 struct regmap *regmap = dev_get_drvdata(dev);
85 long val;
86 int ret;
87
88 if (kstrtol(buf, 10, &val) < 0)
89 return -EINVAL;
90
91 val = clamp_val(val, -55000, 127000);
92 ret = regmap_write(regmap, sda->index, tmp103_mc_to_reg(val));
93 return ret ? ret : count;
94}
95
96static SENSOR_DEVICE_ATTR_RO(temp1_input, tmp103_temp, TMP103_TEMP_REG);
97
98static SENSOR_DEVICE_ATTR_RW(temp1_min, tmp103_temp, TMP103_TLOW_REG);
99
100static SENSOR_DEVICE_ATTR_RW(temp1_max, tmp103_temp, TMP103_THIGH_REG);
101
102static struct attribute *tmp103_attrs[] = {
103 &sensor_dev_attr_temp1_input.dev_attr.attr,
104 &sensor_dev_attr_temp1_min.dev_attr.attr,
105 &sensor_dev_attr_temp1_max.dev_attr.attr,
106 NULL
107};
108ATTRIBUTE_GROUPS(tmp103);
109
110static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg)
111{
112 return reg == TMP103_TEMP_REG;
113}
114
115static const struct regmap_config tmp103_regmap_config = {
116 .reg_bits = 8,
117 .val_bits = 8,
118 .max_register = TMP103_THIGH_REG,
119 .volatile_reg = tmp103_regmap_is_volatile,
120};
121
122static int tmp103_probe(struct i2c_client *client,
123 const struct i2c_device_id *id)
124{
125 struct device *dev = &client->dev;
126 struct device *hwmon_dev;
127 struct regmap *regmap;
128 int ret;
129
130 regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config);
131 if (IS_ERR(regmap)) {
132 dev_err(dev, "failed to allocate register map\n");
133 return PTR_ERR(regmap);
134 }
135
136 ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK,
137 TMP103_CONFIG);
138 if (ret < 0) {
139 dev_err(&client->dev, "error writing config register\n");
140 return ret;
141 }
142
143 i2c_set_clientdata(client, regmap);
144 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
145 regmap, tmp103_groups);
146 return PTR_ERR_OR_ZERO(hwmon_dev);
147}
148
149static int __maybe_unused tmp103_suspend(struct device *dev)
150{
151 struct regmap *regmap = dev_get_drvdata(dev);
152
153 return regmap_update_bits(regmap, TMP103_CONF_REG,
154 TMP103_CONF_SD_MASK, 0);
155}
156
157static int __maybe_unused tmp103_resume(struct device *dev)
158{
159 struct regmap *regmap = dev_get_drvdata(dev);
160
161 return regmap_update_bits(regmap, TMP103_CONF_REG,
162 TMP103_CONF_SD_MASK, TMP103_CONF_SD);
163}
164
165static SIMPLE_DEV_PM_OPS(tmp103_dev_pm_ops, tmp103_suspend, tmp103_resume);
166
167static const struct i2c_device_id tmp103_id[] = {
168 { "tmp103", 0 },
169 { }
170};
171MODULE_DEVICE_TABLE(i2c, tmp103_id);
172
173static const struct of_device_id __maybe_unused tmp103_of_match[] = {
174 { .compatible = "ti,tmp103" },
175 { },
176};
177MODULE_DEVICE_TABLE(of, tmp103_of_match);
178
179static struct i2c_driver tmp103_driver = {
180 .driver = {
181 .name = "tmp103",
182 .of_match_table = of_match_ptr(tmp103_of_match),
183 .pm = &tmp103_dev_pm_ops,
184 },
185 .probe = tmp103_probe,
186 .id_table = tmp103_id,
187};
188
189module_i2c_driver(tmp103_driver);
190
191MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
192MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
193MODULE_LICENSE("GPL");