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Jean Delvarecff37c92010-05-27 19:58:57 +02001/* Texas Instruments TMP102 SMBus temperature sensor driver
Steven Kingbeb1b6b2010-05-27 19:58:56 +02002 *
Jean Delvarecff37c92010-05-27 19:58:57 +02003 * Copyright (C) 2010 Steven King <sfking@fdwdc.com>
Steven Kingbeb1b6b2010-05-27 19:58:56 +02004 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
Steven Kingbeb1b6b2010-05-27 19:58:56 +020014 */
15
Steven Kingbeb1b6b2010-05-27 19:58:56 +020016#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/slab.h>
19#include <linux/i2c.h>
20#include <linux/hwmon.h>
21#include <linux/hwmon-sysfs.h>
22#include <linux/err.h>
23#include <linux/mutex.h>
Jean Delvarecff37c92010-05-27 19:58:57 +020024#include <linux/device.h>
Jean Delvaredcd8f392012-10-10 15:25:56 +020025#include <linux/jiffies.h>
Eduardo Valentin6a027522013-07-16 14:57:51 -040026#include <linux/thermal.h>
27#include <linux/of.h>
Steven Kingbeb1b6b2010-05-27 19:58:56 +020028
29#define DRIVER_NAME "tmp102"
30
31#define TMP102_TEMP_REG 0x00
32#define TMP102_CONF_REG 0x01
33/* note: these bit definitions are byte swapped */
34#define TMP102_CONF_SD 0x0100
35#define TMP102_CONF_TM 0x0200
36#define TMP102_CONF_POL 0x0400
37#define TMP102_CONF_F0 0x0800
38#define TMP102_CONF_F1 0x1000
39#define TMP102_CONF_R0 0x2000
40#define TMP102_CONF_R1 0x4000
41#define TMP102_CONF_OS 0x8000
42#define TMP102_CONF_EM 0x0010
43#define TMP102_CONF_AL 0x0020
44#define TMP102_CONF_CR0 0x0040
45#define TMP102_CONF_CR1 0x0080
46#define TMP102_TLOW_REG 0x02
47#define TMP102_THIGH_REG 0x03
48
49struct tmp102 {
Guenter Roeckad9beea2014-02-02 10:08:09 -080050 struct i2c_client *client;
Steven Kingbeb1b6b2010-05-27 19:58:56 +020051 struct mutex lock;
Jean Delvare38806bd2010-05-27 19:58:59 +020052 u16 config_orig;
Steven Kingbeb1b6b2010-05-27 19:58:56 +020053 unsigned long last_update;
54 int temp[3];
Nishanth Menon00917b52015-12-01 10:10:21 -060055 bool first_time;
Steven Kingbeb1b6b2010-05-27 19:58:56 +020056};
57
Jean Delvarecff37c92010-05-27 19:58:57 +020058/* convert left adjusted 13-bit TMP102 register value to milliCelsius */
59static inline int tmp102_reg_to_mC(s16 val)
Steven Kingbeb1b6b2010-05-27 19:58:56 +020060{
Jean Delvarecff37c92010-05-27 19:58:57 +020061 return ((val & ~0x01) * 1000) / 128;
Steven Kingbeb1b6b2010-05-27 19:58:56 +020062}
63
Jean Delvarecff37c92010-05-27 19:58:57 +020064/* convert milliCelsius to left adjusted 13-bit TMP102 register value */
65static inline u16 tmp102_mC_to_reg(int val)
Steven Kingbeb1b6b2010-05-27 19:58:56 +020066{
67 return (val * 128) / 1000;
68}
69
70static const u8 tmp102_reg[] = {
71 TMP102_TEMP_REG,
72 TMP102_TLOW_REG,
73 TMP102_THIGH_REG,
74};
75
Guenter Roeckad9beea2014-02-02 10:08:09 -080076static struct tmp102 *tmp102_update_device(struct device *dev)
Steven Kingbeb1b6b2010-05-27 19:58:56 +020077{
Guenter Roeckad9beea2014-02-02 10:08:09 -080078 struct tmp102 *tmp102 = dev_get_drvdata(dev);
79 struct i2c_client *client = tmp102->client;
Steven Kingbeb1b6b2010-05-27 19:58:56 +020080
81 mutex_lock(&tmp102->lock);
Jean Delvarecff37c92010-05-27 19:58:57 +020082 if (time_after(jiffies, tmp102->last_update + HZ / 3)) {
Steven Kingbeb1b6b2010-05-27 19:58:56 +020083 int i;
84 for (i = 0; i < ARRAY_SIZE(tmp102->temp); ++i) {
Jean Delvare90f41022011-11-04 12:00:47 +010085 int status = i2c_smbus_read_word_swapped(client,
86 tmp102_reg[i]);
Steven Kingbeb1b6b2010-05-27 19:58:56 +020087 if (status > -1)
88 tmp102->temp[i] = tmp102_reg_to_mC(status);
89 }
90 tmp102->last_update = jiffies;
Nishanth Menon00917b52015-12-01 10:10:21 -060091 tmp102->first_time = false;
Steven Kingbeb1b6b2010-05-27 19:58:56 +020092 }
93 mutex_unlock(&tmp102->lock);
94 return tmp102;
95}
96
Sascha Hauer17e83512015-07-24 08:12:54 +020097static int tmp102_read_temp(void *dev, int *temp)
Eduardo Valentin6a027522013-07-16 14:57:51 -040098{
Guenter Roeckad9beea2014-02-02 10:08:09 -080099 struct tmp102 *tmp102 = tmp102_update_device(dev);
Eduardo Valentin6a027522013-07-16 14:57:51 -0400100
Nishanth Menon00917b52015-12-01 10:10:21 -0600101 /* Is it too early even to return a conversion? */
102 if (tmp102->first_time) {
103 dev_dbg(dev, "%s: Conversion not ready yet..\n", __func__);
104 return -EAGAIN;
105 }
106
Eduardo Valentin6a027522013-07-16 14:57:51 -0400107 *temp = tmp102->temp[0];
108
109 return 0;
110}
111
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200112static ssize_t tmp102_show_temp(struct device *dev,
113 struct device_attribute *attr,
114 char *buf)
115{
116 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
Guenter Roeckad9beea2014-02-02 10:08:09 -0800117 struct tmp102 *tmp102 = tmp102_update_device(dev);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200118
Nishanth Menon00917b52015-12-01 10:10:21 -0600119 /* Is it too early even to return a read? */
120 if (tmp102->first_time)
121 return -EAGAIN;
122
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200123 return sprintf(buf, "%d\n", tmp102->temp[sda->index]);
124}
125
126static ssize_t tmp102_set_temp(struct device *dev,
127 struct device_attribute *attr,
128 const char *buf, size_t count)
129{
130 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
Guenter Roeckad9beea2014-02-02 10:08:09 -0800131 struct tmp102 *tmp102 = dev_get_drvdata(dev);
132 struct i2c_client *client = tmp102->client;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200133 long val;
Jean Delvarecff37c92010-05-27 19:58:57 +0200134 int status;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200135
Frans Meulenbroeks179c4fd2012-01-04 20:58:52 +0100136 if (kstrtol(buf, 10, &val) < 0)
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200137 return -EINVAL;
Guenter Roeck2a844c12013-01-09 08:09:34 -0800138 val = clamp_val(val, -256000, 255000);
Jean Delvarecff37c92010-05-27 19:58:57 +0200139
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200140 mutex_lock(&tmp102->lock);
Jean Delvarecff37c92010-05-27 19:58:57 +0200141 tmp102->temp[sda->index] = val;
Jean Delvare90f41022011-11-04 12:00:47 +0100142 status = i2c_smbus_write_word_swapped(client, tmp102_reg[sda->index],
143 tmp102_mC_to_reg(val));
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200144 mutex_unlock(&tmp102->lock);
145 return status ? : count;
146}
147
148static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp102_show_temp, NULL , 0);
149
150static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, tmp102_show_temp,
151 tmp102_set_temp, 1);
152
153static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp102_show_temp,
154 tmp102_set_temp, 2);
155
Guenter Roeckad9beea2014-02-02 10:08:09 -0800156static struct attribute *tmp102_attrs[] = {
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200157 &sensor_dev_attr_temp1_input.dev_attr.attr,
158 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
159 &sensor_dev_attr_temp1_max.dev_attr.attr,
160 NULL
161};
Guenter Roeckad9beea2014-02-02 10:08:09 -0800162ATTRIBUTE_GROUPS(tmp102);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200163
164#define TMP102_CONFIG (TMP102_CONF_TM | TMP102_CONF_EM | TMP102_CONF_CR1)
165#define TMP102_CONFIG_RD_ONLY (TMP102_CONF_R0 | TMP102_CONF_R1 | TMP102_CONF_AL)
166
Eduardo Valentin2251aef2014-11-07 21:24:39 -0400167static const struct thermal_zone_of_device_ops tmp102_of_thermal_ops = {
168 .get_temp = tmp102_read_temp,
169};
170
Guenter Roeckb17ea1c2016-06-19 20:09:54 -0700171static void tmp102_restore_config(void *data)
172{
173 struct tmp102 *tmp102 = data;
174 struct i2c_client *client = tmp102->client;
175
176 i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
177 tmp102->config_orig);
178}
179
Bill Pemberton6c931ae2012-11-19 13:22:35 -0500180static int tmp102_probe(struct i2c_client *client,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200181 const struct i2c_device_id *id)
182{
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800183 struct device *dev = &client->dev;
Guenter Roeckad9beea2014-02-02 10:08:09 -0800184 struct device *hwmon_dev;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200185 struct tmp102 *tmp102;
186 int status;
187
Jean Delvarecff37c92010-05-27 19:58:57 +0200188 if (!i2c_check_functionality(client->adapter,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200189 I2C_FUNC_SMBUS_WORD_DATA)) {
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800190 dev_err(dev,
Guenter Roeckb55f3752013-01-10 10:01:24 -0800191 "adapter doesn't support SMBus word transactions\n");
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200192 return -ENODEV;
193 }
194
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800195 tmp102 = devm_kzalloc(dev, sizeof(*tmp102), GFP_KERNEL);
Guenter Roeckf511a212012-06-02 11:35:52 -0700196 if (!tmp102)
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200197 return -ENOMEM;
Guenter Roeckf511a212012-06-02 11:35:52 -0700198
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200199 i2c_set_clientdata(client, tmp102);
Guenter Roeckad9beea2014-02-02 10:08:09 -0800200 tmp102->client = client;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200201
Jean Delvare90f41022011-11-04 12:00:47 +0100202 status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Jean Delvare38806bd2010-05-27 19:58:59 +0200203 if (status < 0) {
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800204 dev_err(dev, "error reading config register\n");
Guenter Roeckf511a212012-06-02 11:35:52 -0700205 return status;
Jean Delvare38806bd2010-05-27 19:58:59 +0200206 }
207 tmp102->config_orig = status;
Guenter Roeckb17ea1c2016-06-19 20:09:54 -0700208
209 devm_add_action(dev, tmp102_restore_config, tmp102);
210
Jean Delvare90f41022011-11-04 12:00:47 +0100211 status = i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
212 TMP102_CONFIG);
Jean Delvarecff37c92010-05-27 19:58:57 +0200213 if (status < 0) {
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800214 dev_err(dev, "error writing config register\n");
Guenter Roeckb17ea1c2016-06-19 20:09:54 -0700215 return status;
Jean Delvarecff37c92010-05-27 19:58:57 +0200216 }
Jean Delvare90f41022011-11-04 12:00:47 +0100217 status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200218 if (status < 0) {
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800219 dev_err(dev, "error reading config register\n");
Guenter Roeckb17ea1c2016-06-19 20:09:54 -0700220 return status;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200221 }
222 status &= ~TMP102_CONFIG_RD_ONLY;
223 if (status != TMP102_CONFIG) {
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800224 dev_err(dev, "config settings did not stick\n");
Guenter Roeckb17ea1c2016-06-19 20:09:54 -0700225 return -ENODEV;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200226 }
Nishanth Menon00917b52015-12-01 10:10:21 -0600227 tmp102->last_update = jiffies;
228 /* Mark that we are not ready with data until conversion is complete */
229 tmp102->first_time = true;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200230 mutex_init(&tmp102->lock);
231
Guenter Roeckb17ea1c2016-06-19 20:09:54 -0700232 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
233 tmp102,
234 tmp102_groups);
Guenter Roeckad9beea2014-02-02 10:08:09 -0800235 if (IS_ERR(hwmon_dev)) {
236 dev_dbg(dev, "unable to register hwmon device\n");
Guenter Roeckb17ea1c2016-06-19 20:09:54 -0700237 return PTR_ERR(hwmon_dev);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200238 }
Eduardo Valentin51b77fd2016-03-09 13:02:54 -0800239 devm_thermal_zone_of_sensor_register(hwmon_dev, 0, hwmon_dev,
240 &tmp102_of_thermal_ops);
Eduardo Valentin6a027522013-07-16 14:57:51 -0400241
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800242 dev_info(dev, "initialized\n");
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200243
244 return 0;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200245}
246
Grygorii Strashkodd378b12015-02-03 17:01:58 +0200247#ifdef CONFIG_PM_SLEEP
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200248static int tmp102_suspend(struct device *dev)
249{
250 struct i2c_client *client = to_i2c_client(dev);
Jean Delvare8d4dee92010-05-27 19:58:58 +0200251 int config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200252
Jean Delvare90f41022011-11-04 12:00:47 +0100253 config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Jean Delvare8d4dee92010-05-27 19:58:58 +0200254 if (config < 0)
255 return config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200256
Jean Delvare8d4dee92010-05-27 19:58:58 +0200257 config |= TMP102_CONF_SD;
Jean Delvare90f41022011-11-04 12:00:47 +0100258 return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200259}
260
261static int tmp102_resume(struct device *dev)
262{
263 struct i2c_client *client = to_i2c_client(dev);
Jean Delvare8d4dee92010-05-27 19:58:58 +0200264 int config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200265
Jean Delvare90f41022011-11-04 12:00:47 +0100266 config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Jean Delvare8d4dee92010-05-27 19:58:58 +0200267 if (config < 0)
268 return config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200269
Jean Delvare8d4dee92010-05-27 19:58:58 +0200270 config &= ~TMP102_CONF_SD;
Jean Delvare90f41022011-11-04 12:00:47 +0100271 return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200272}
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200273#endif /* CONFIG_PM */
274
Grygorii Strashkodd378b12015-02-03 17:01:58 +0200275static SIMPLE_DEV_PM_OPS(tmp102_dev_pm_ops, tmp102_suspend, tmp102_resume);
276
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200277static const struct i2c_device_id tmp102_id[] = {
Jean Delvarecff37c92010-05-27 19:58:57 +0200278 { "tmp102", 0 },
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200279 { }
280};
Jean Delvarecff37c92010-05-27 19:58:57 +0200281MODULE_DEVICE_TABLE(i2c, tmp102_id);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200282
283static struct i2c_driver tmp102_driver = {
284 .driver.name = DRIVER_NAME,
Grygorii Strashkodd378b12015-02-03 17:01:58 +0200285 .driver.pm = &tmp102_dev_pm_ops,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200286 .probe = tmp102_probe,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200287 .id_table = tmp102_id,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200288};
289
Axel Linf0967ee2012-01-20 15:38:18 +0800290module_i2c_driver(tmp102_driver);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200291
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200292MODULE_AUTHOR("Steven King <sfking@fdwdc.com>");
293MODULE_DESCRIPTION("Texas Instruments TMP102 temperature sensor driver");
294MODULE_LICENSE("GPL");