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", 0 },
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");

 
  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_show_temp(struct device *dev,
 65				struct device_attribute *attr,
 66				char *buf)
 67{
 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;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 72
 73	ret = regmap_read(regmap, sda->index, &regval);
 74	if (ret < 0)
 75		return ret;
 76
 77	return sprintf(buf, "%d\n", tmp103_reg_to_mc(regval));
 78}
 79
 80static ssize_t tmp103_set_temp(struct device *dev,
 81			       struct device_attribute *attr,
 82			       const char *buf, size_t count)
 83{
 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;
 88
 89	if (kstrtol(buf, 10, &val) < 0)
 90		return -EINVAL;
 
 
 
 
 
 
 
 
 91
 92	val = clamp_val(val, -55000, 127000);
 93	ret = regmap_write(regmap, sda->index, tmp103_mc_to_reg(val));
 94	return ret ? ret : count;
 95}
 96
 97static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp103_show_temp, NULL ,
 98			  TMP103_TEMP_REG);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 99
100static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, tmp103_show_temp,
101			  tmp103_set_temp, TMP103_TLOW_REG);
 
 
 
 
 
102
103static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp103_show_temp,
104			  tmp103_set_temp, TMP103_THIGH_REG);
 
 
 
105
106static 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
111};
112ATTRIBUTE_GROUPS(tmp103);
113
114static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg)
115{
116	return reg == TMP103_TEMP_REG;
117}
118
119static 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,
124};
125
126static int tmp103_probe(struct i2c_client *client,
127			const struct i2c_device_id *id)
128{
129	struct device *dev = &client->dev;
130	struct device *hwmon_dev;
131	struct regmap *regmap;
132	int ret;
133
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);
138	}
139
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;
145	}
146
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);
151}
152
153#ifdef CONFIG_PM
154static int tmp103_suspend(struct device *dev)
155{
156	struct regmap *regmap = dev_get_drvdata(dev);
157
158	return regmap_update_bits(regmap, TMP103_CONF_REG,
159				  TMP103_CONF_SD_MASK, 0);
160}
161
162static int tmp103_resume(struct device *dev)
163{
164	struct regmap *regmap = dev_get_drvdata(dev);
165
166	return regmap_update_bits(regmap, TMP103_CONF_REG,
167				  TMP103_CONF_SD_MASK, TMP103_CONF_SD);
168}
169
170static const struct dev_pm_ops tmp103_dev_pm_ops = {
171	.suspend	= tmp103_suspend,
172	.resume		= tmp103_resume,
173};
174
175#define TMP103_DEV_PM_OPS (&tmp103_dev_pm_ops)
176#else
177#define	TMP103_DEV_PM_OPS NULL
178#endif /* CONFIG_PM */
179
180static const struct i2c_device_id tmp103_id[] = {
181	{ "tmp103", 0 },
182	{ }
183};
184MODULE_DEVICE_TABLE(i2c, tmp103_id);
185
 
 
 
 
 
 
186static struct i2c_driver tmp103_driver = {
187	.driver = {
188		.name	= "tmp103",
189		.pm	= TMP103_DEV_PM_OPS,
 
190	},
191	.probe		= tmp103_probe,
192	.id_table	= tmp103_id,
193};
194
195module_i2c_driver(tmp103_driver);
196
197MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
198MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
199MODULE_LICENSE("GPL");