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 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
 69static 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
 86static SENSOR_DEVICE_ATTR_RO(temp1_input, tmp103_temp, TMP103_TEMP_REG);
 87
 88static SENSOR_DEVICE_ATTR_RW(temp1_min, tmp103_temp, TMP103_TLOW_REG);
 89
 90static SENSOR_DEVICE_ATTR_RW(temp1_max, tmp103_temp, TMP103_THIGH_REG);
 91
 92static 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};
 98ATTRIBUTE_GROUPS(tmp103);
 99
100static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg)
101{
102	return reg == TMP103_TEMP_REG;
103}
104
105static 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
112static int tmp103_probe(struct i2c_client *client)
113{
114	struct device *dev = &client->dev;
115	struct device *hwmon_dev;
116	struct regmap *regmap;
117	int ret;
118
119	regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config);
120	if (IS_ERR(regmap)) {
121		dev_err(dev, "failed to allocate register map\n");
122		return PTR_ERR(regmap);
123	}
124
125	ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK,
126				 TMP103_CONFIG);
127	if (ret < 0) {
128		dev_err(&client->dev, "error writing config register\n");
129		return ret;
130	}
131
132	i2c_set_clientdata(client, regmap);
133	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
134						      regmap, tmp103_groups);
135	return PTR_ERR_OR_ZERO(hwmon_dev);
136}
137
138static int __maybe_unused tmp103_suspend(struct device *dev)
139{
140	struct regmap *regmap = dev_get_drvdata(dev);
141
142	return regmap_update_bits(regmap, TMP103_CONF_REG,
143				  TMP103_CONF_SD_MASK, 0);
144}
145
146static int __maybe_unused tmp103_resume(struct device *dev)
147{
148	struct regmap *regmap = dev_get_drvdata(dev);
149
150	return regmap_update_bits(regmap, TMP103_CONF_REG,
151				  TMP103_CONF_SD_MASK, TMP103_CONF_SD);
152}
153
154static SIMPLE_DEV_PM_OPS(tmp103_dev_pm_ops, tmp103_suspend, tmp103_resume);
155
156static const struct i2c_device_id tmp103_id[] = {
157	{ "tmp103", 0 },
158	{ }
159};
160MODULE_DEVICE_TABLE(i2c, tmp103_id);
161
162static const struct of_device_id __maybe_unused tmp103_of_match[] = {
163	{ .compatible = "ti,tmp103" },
164	{ },
165};
166MODULE_DEVICE_TABLE(of, tmp103_of_match);
167
168static struct i2c_driver tmp103_driver = {
169	.driver = {
170		.name	= "tmp103",
171		.of_match_table = of_match_ptr(tmp103_of_match),
172		.pm	= &tmp103_dev_pm_ops,
173	},
174	.probe_new	= tmp103_probe,
175	.id_table	= tmp103_id,
176};
177
178module_i2c_driver(tmp103_driver);
179
180MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
181MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
182MODULE_LICENSE("GPL");