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
44static inline int tmp103_reg_to_mc(s8 val)
45{
46	return val * 1000;
47}
48
49static inline u8 tmp103_mc_to_reg(int val)
50{
51	return DIV_ROUND_CLOSEST(val, 1000);
52}
53
54static int tmp103_read(struct device *dev, enum hwmon_sensor_types type,
55		       u32 attr, int channel, long *temp)
56{
57	struct regmap *regmap = dev_get_drvdata(dev);
58	unsigned int regval;
59	int err, reg;
60
61	switch (attr) {
62	case hwmon_temp_input:
63		reg = TMP103_TEMP_REG;
64		break;
65	case hwmon_temp_min:
66		reg = TMP103_TLOW_REG;
67		break;
68	case hwmon_temp_max:
69		reg = TMP103_THIGH_REG;
70		break;
71	default:
72		return -EOPNOTSUPP;
73	}
74
75	err = regmap_read(regmap, reg, &regval);
76	if (err < 0)
77		return err;
78
79	*temp = tmp103_reg_to_mc(regval);
80
81	return 0;
82}
83
84static int tmp103_write(struct device *dev, enum hwmon_sensor_types type,
85			u32 attr, int channel, long temp)
86{
87	struct regmap *regmap = dev_get_drvdata(dev);
88	int reg;
89
90	switch (attr) {
91	case hwmon_temp_min:
92		reg = TMP103_TLOW_REG;
93		break;
94	case hwmon_temp_max:
95		reg = TMP103_THIGH_REG;
96		break;
97	default:
98		return -EOPNOTSUPP;
99	}
100
101	temp = clamp_val(temp, -55000, 127000);
102	return regmap_write(regmap, reg, tmp103_mc_to_reg(temp));
103}
104
105static umode_t tmp103_is_visible(const void *data, enum hwmon_sensor_types type,
106				 u32 attr, int channel)
107{
108	if (type != hwmon_temp)
109		return 0;
110
111	switch (attr) {
112	case hwmon_temp_input:
113		return 0444;
114	case hwmon_temp_min:
115	case hwmon_temp_max:
116		return 0644;
117	default:
118		return 0;
119	}
120}
121
122static const struct hwmon_channel_info * const tmp103_info[] = {
123	HWMON_CHANNEL_INFO(chip,
124			   HWMON_C_REGISTER_TZ),
125	HWMON_CHANNEL_INFO(temp,
126			   HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN),
127	NULL
128};
129
130static const struct hwmon_ops tmp103_hwmon_ops = {
131	.is_visible = tmp103_is_visible,
132	.read = tmp103_read,
133	.write = tmp103_write,
134};
135
136static const struct hwmon_chip_info tmp103_chip_info = {
137	.ops = &tmp103_hwmon_ops,
138	.info = tmp103_info,
139};
140
141static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg)
142{
143	return reg == TMP103_TEMP_REG;
144}
145
146static const struct regmap_config tmp103_regmap_config = {
147	.reg_bits = 8,
148	.val_bits = 8,
149	.max_register = TMP103_THIGH_REG,
150	.volatile_reg = tmp103_regmap_is_volatile,
151};
152
153static int tmp103_probe(struct i2c_client *client)
154{
155	struct device *dev = &client->dev;
156	struct device *hwmon_dev;
157	struct regmap *regmap;
158	int ret;
159
160	regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config);
161	if (IS_ERR(regmap)) {
162		dev_err(dev, "failed to allocate register map\n");
163		return PTR_ERR(regmap);
164	}
165
166	ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK,
167				 TMP103_CONFIG);
168	if (ret < 0) {
169		dev_err(&client->dev, "error writing config register\n");
170		return ret;
171	}
172
173	i2c_set_clientdata(client, regmap);
174	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
175							 regmap,
176							 &tmp103_chip_info,
177							 NULL);
178	return PTR_ERR_OR_ZERO(hwmon_dev);
179}
180
181static int tmp103_suspend(struct device *dev)
182{
183	struct regmap *regmap = dev_get_drvdata(dev);
184
185	return regmap_update_bits(regmap, TMP103_CONF_REG,
186				  TMP103_CONF_SD_MASK, 0);
187}
188
189static int tmp103_resume(struct device *dev)
190{
191	struct regmap *regmap = dev_get_drvdata(dev);
192
193	return regmap_update_bits(regmap, TMP103_CONF_REG,
194				  TMP103_CONF_SD_MASK, TMP103_CONF_SD);
195}
196
197static DEFINE_SIMPLE_DEV_PM_OPS(tmp103_dev_pm_ops, tmp103_suspend, tmp103_resume);
198
199static const struct i2c_device_id tmp103_id[] = {
200	{ "tmp103" },
201	{ }
202};
203MODULE_DEVICE_TABLE(i2c, tmp103_id);
204
205static const struct of_device_id __maybe_unused tmp103_of_match[] = {
206	{ .compatible = "ti,tmp103" },
207	{ },
208};
209MODULE_DEVICE_TABLE(of, tmp103_of_match);
210
211static struct i2c_driver tmp103_driver = {
212	.driver = {
213		.name	= "tmp103",
214		.of_match_table = of_match_ptr(tmp103_of_match),
215		.pm	= pm_sleep_ptr(&tmp103_dev_pm_ops),
216	},
217	.probe		= tmp103_probe,
218	.id_table	= tmp103_id,
219};
220
221module_i2c_driver(tmp103_driver);
222
223MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
224MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
225MODULE_LICENSE("GPL");
226