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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/err.h>
18#include <linux/device.h>
19#include <linux/regmap.h>
20
21#define TMP103_TEMP_REG 0x00
22#define TMP103_CONF_REG 0x01
23#define TMP103_TLOW_REG 0x02
24#define TMP103_THIGH_REG 0x03
25
26#define TMP103_CONF_M0 0x01
27#define TMP103_CONF_M1 0x02
28#define TMP103_CONF_LC 0x04
29#define TMP103_CONF_FL 0x08
30#define TMP103_CONF_FH 0x10
31#define TMP103_CONF_CR0 0x20
32#define TMP103_CONF_CR1 0x40
33#define TMP103_CONF_ID 0x80
34#define TMP103_CONF_SD (TMP103_CONF_M1)
35#define TMP103_CONF_SD_MASK (TMP103_CONF_M0 | TMP103_CONF_M1)
36
37#define TMP103_CONFIG (TMP103_CONF_CR1 | TMP103_CONF_M1)
38#define TMP103_CONFIG_MASK (TMP103_CONF_CR0 | TMP103_CONF_CR1 | \
39 TMP103_CONF_M0 | TMP103_CONF_M1)
40
41static inline int tmp103_reg_to_mc(s8 val)
42{
43 return val * 1000;
44}
45
46static inline u8 tmp103_mc_to_reg(int val)
47{
48 return DIV_ROUND_CLOSEST(val, 1000);
49}
50
51static int tmp103_read(struct device *dev, enum hwmon_sensor_types type,
52 u32 attr, int channel, long *temp)
53{
54 struct regmap *regmap = dev_get_drvdata(dev);
55 unsigned int regval;
56 int err, reg;
57
58 switch (attr) {
59 case hwmon_temp_input:
60 reg = TMP103_TEMP_REG;
61 break;
62 case hwmon_temp_min:
63 reg = TMP103_TLOW_REG;
64 break;
65 case hwmon_temp_max:
66 reg = TMP103_THIGH_REG;
67 break;
68 default:
69 return -EOPNOTSUPP;
70 }
71
72 err = regmap_read(regmap, reg, ®val);
73 if (err < 0)
74 return err;
75
76 *temp = tmp103_reg_to_mc(regval);
77
78 return 0;
79}
80
81static int tmp103_write(struct device *dev, enum hwmon_sensor_types type,
82 u32 attr, int channel, long temp)
83{
84 struct regmap *regmap = dev_get_drvdata(dev);
85 int reg;
86
87 switch (attr) {
88 case hwmon_temp_min:
89 reg = TMP103_TLOW_REG;
90 break;
91 case hwmon_temp_max:
92 reg = TMP103_THIGH_REG;
93 break;
94 default:
95 return -EOPNOTSUPP;
96 }
97
98 temp = clamp_val(temp, -55000, 127000);
99 return regmap_write(regmap, reg, tmp103_mc_to_reg(temp));
100}
101
102static umode_t tmp103_is_visible(const void *data, enum hwmon_sensor_types type,
103 u32 attr, int channel)
104{
105 if (type != hwmon_temp)
106 return 0;
107
108 switch (attr) {
109 case hwmon_temp_input:
110 return 0444;
111 case hwmon_temp_min:
112 case hwmon_temp_max:
113 return 0644;
114 default:
115 return 0;
116 }
117}
118
119static const struct hwmon_channel_info * const tmp103_info[] = {
120 HWMON_CHANNEL_INFO(chip,
121 HWMON_C_REGISTER_TZ),
122 HWMON_CHANNEL_INFO(temp,
123 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN),
124 NULL
125};
126
127static const struct hwmon_ops tmp103_hwmon_ops = {
128 .is_visible = tmp103_is_visible,
129 .read = tmp103_read,
130 .write = tmp103_write,
131};
132
133static const struct hwmon_chip_info tmp103_chip_info = {
134 .ops = &tmp103_hwmon_ops,
135 .info = tmp103_info,
136};
137
138static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg)
139{
140 return reg == TMP103_TEMP_REG;
141}
142
143static const struct regmap_config tmp103_regmap_config = {
144 .reg_bits = 8,
145 .val_bits = 8,
146 .max_register = TMP103_THIGH_REG,
147 .volatile_reg = tmp103_regmap_is_volatile,
148};
149
150static int tmp103_probe(struct i2c_client *client)
151{
152 struct device *dev = &client->dev;
153 struct device *hwmon_dev;
154 struct regmap *regmap;
155 int ret;
156
157 regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config);
158 if (IS_ERR(regmap)) {
159 dev_err(dev, "failed to allocate register map\n");
160 return PTR_ERR(regmap);
161 }
162
163 ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK,
164 TMP103_CONFIG);
165 if (ret < 0) {
166 dev_err(&client->dev, "error writing config register\n");
167 return ret;
168 }
169
170 i2c_set_clientdata(client, regmap);
171 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
172 regmap,
173 &tmp103_chip_info,
174 NULL);
175 return PTR_ERR_OR_ZERO(hwmon_dev);
176}
177
178static int tmp103_suspend(struct device *dev)
179{
180 struct regmap *regmap = dev_get_drvdata(dev);
181
182 return regmap_update_bits(regmap, TMP103_CONF_REG,
183 TMP103_CONF_SD_MASK, 0);
184}
185
186static int tmp103_resume(struct device *dev)
187{
188 struct regmap *regmap = dev_get_drvdata(dev);
189
190 return regmap_update_bits(regmap, TMP103_CONF_REG,
191 TMP103_CONF_SD_MASK, TMP103_CONF_SD);
192}
193
194static DEFINE_SIMPLE_DEV_PM_OPS(tmp103_dev_pm_ops, tmp103_suspend, tmp103_resume);
195
196static const struct i2c_device_id tmp103_id[] = {
197 { "tmp103" },
198 { }
199};
200MODULE_DEVICE_TABLE(i2c, tmp103_id);
201
202static const struct of_device_id __maybe_unused tmp103_of_match[] = {
203 { .compatible = "ti,tmp103" },
204 { },
205};
206MODULE_DEVICE_TABLE(of, tmp103_of_match);
207
208static struct i2c_driver tmp103_driver = {
209 .driver = {
210 .name = "tmp103",
211 .of_match_table = of_match_ptr(tmp103_of_match),
212 .pm = pm_sleep_ptr(&tmp103_dev_pm_ops),
213 },
214 .probe = tmp103_probe,
215 .id_table = tmp103_id,
216};
217
218module_i2c_driver(tmp103_driver);
219
220MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
221MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
222MODULE_LICENSE("GPL");