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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.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
Steven Kingbeb1b6b2010-05-27 19:58:56 +020020#include <linux/module.h>
21#include <linux/init.h>
22#include <linux/slab.h>
23#include <linux/i2c.h>
24#include <linux/hwmon.h>
25#include <linux/hwmon-sysfs.h>
26#include <linux/err.h>
27#include <linux/mutex.h>
Jean Delvarecff37c92010-05-27 19:58:57 +020028#include <linux/device.h>
Jean Delvaredcd8f392012-10-10 15:25:56 +020029#include <linux/jiffies.h>
Eduardo Valentin6a027522013-07-16 14:57:51 -040030#include <linux/thermal.h>
31#include <linux/of.h>
Steven Kingbeb1b6b2010-05-27 19:58:56 +020032
33#define DRIVER_NAME "tmp102"
34
35#define TMP102_TEMP_REG 0x00
36#define TMP102_CONF_REG 0x01
37/* note: these bit definitions are byte swapped */
38#define TMP102_CONF_SD 0x0100
39#define TMP102_CONF_TM 0x0200
40#define TMP102_CONF_POL 0x0400
41#define TMP102_CONF_F0 0x0800
42#define TMP102_CONF_F1 0x1000
43#define TMP102_CONF_R0 0x2000
44#define TMP102_CONF_R1 0x4000
45#define TMP102_CONF_OS 0x8000
46#define TMP102_CONF_EM 0x0010
47#define TMP102_CONF_AL 0x0020
48#define TMP102_CONF_CR0 0x0040
49#define TMP102_CONF_CR1 0x0080
50#define TMP102_TLOW_REG 0x02
51#define TMP102_THIGH_REG 0x03
52
53struct tmp102 {
Guenter Roeckad9beea2014-02-02 10:08:09 -080054 struct i2c_client *client;
Steven Kingbeb1b6b2010-05-27 19:58:56 +020055 struct device *hwmon_dev;
Eduardo Valentin6a027522013-07-16 14:57:51 -040056 struct thermal_zone_device *tz;
Steven Kingbeb1b6b2010-05-27 19:58:56 +020057 struct mutex lock;
Jean Delvare38806bd2010-05-27 19:58:59 +020058 u16 config_orig;
Steven Kingbeb1b6b2010-05-27 19:58:56 +020059 unsigned long last_update;
60 int temp[3];
61};
62
Jean Delvarecff37c92010-05-27 19:58:57 +020063/* convert left adjusted 13-bit TMP102 register value to milliCelsius */
64static inline int tmp102_reg_to_mC(s16 val)
Steven Kingbeb1b6b2010-05-27 19:58:56 +020065{
Jean Delvarecff37c92010-05-27 19:58:57 +020066 return ((val & ~0x01) * 1000) / 128;
Steven Kingbeb1b6b2010-05-27 19:58:56 +020067}
68
Jean Delvarecff37c92010-05-27 19:58:57 +020069/* convert milliCelsius to left adjusted 13-bit TMP102 register value */
70static inline u16 tmp102_mC_to_reg(int val)
Steven Kingbeb1b6b2010-05-27 19:58:56 +020071{
72 return (val * 128) / 1000;
73}
74
75static const u8 tmp102_reg[] = {
76 TMP102_TEMP_REG,
77 TMP102_TLOW_REG,
78 TMP102_THIGH_REG,
79};
80
Guenter Roeckad9beea2014-02-02 10:08:09 -080081static struct tmp102 *tmp102_update_device(struct device *dev)
Steven Kingbeb1b6b2010-05-27 19:58:56 +020082{
Guenter Roeckad9beea2014-02-02 10:08:09 -080083 struct tmp102 *tmp102 = dev_get_drvdata(dev);
84 struct i2c_client *client = tmp102->client;
Steven Kingbeb1b6b2010-05-27 19:58:56 +020085
86 mutex_lock(&tmp102->lock);
Jean Delvarecff37c92010-05-27 19:58:57 +020087 if (time_after(jiffies, tmp102->last_update + HZ / 3)) {
Steven Kingbeb1b6b2010-05-27 19:58:56 +020088 int i;
89 for (i = 0; i < ARRAY_SIZE(tmp102->temp); ++i) {
Jean Delvare90f41022011-11-04 12:00:47 +010090 int status = i2c_smbus_read_word_swapped(client,
91 tmp102_reg[i]);
Steven Kingbeb1b6b2010-05-27 19:58:56 +020092 if (status > -1)
93 tmp102->temp[i] = tmp102_reg_to_mC(status);
94 }
95 tmp102->last_update = jiffies;
96 }
97 mutex_unlock(&tmp102->lock);
98 return tmp102;
99}
100
Sascha Hauer17e83512015-07-24 08:12:54 +0200101static int tmp102_read_temp(void *dev, int *temp)
Eduardo Valentin6a027522013-07-16 14:57:51 -0400102{
Guenter Roeckad9beea2014-02-02 10:08:09 -0800103 struct tmp102 *tmp102 = tmp102_update_device(dev);
Eduardo Valentin6a027522013-07-16 14:57:51 -0400104
105 *temp = tmp102->temp[0];
106
107 return 0;
108}
109
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200110static ssize_t tmp102_show_temp(struct device *dev,
111 struct device_attribute *attr,
112 char *buf)
113{
114 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
Guenter Roeckad9beea2014-02-02 10:08:09 -0800115 struct tmp102 *tmp102 = tmp102_update_device(dev);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200116
117 return sprintf(buf, "%d\n", tmp102->temp[sda->index]);
118}
119
120static ssize_t tmp102_set_temp(struct device *dev,
121 struct device_attribute *attr,
122 const char *buf, size_t count)
123{
124 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
Guenter Roeckad9beea2014-02-02 10:08:09 -0800125 struct tmp102 *tmp102 = dev_get_drvdata(dev);
126 struct i2c_client *client = tmp102->client;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200127 long val;
Jean Delvarecff37c92010-05-27 19:58:57 +0200128 int status;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200129
Frans Meulenbroeks179c4fd2012-01-04 20:58:52 +0100130 if (kstrtol(buf, 10, &val) < 0)
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200131 return -EINVAL;
Guenter Roeck2a844c12013-01-09 08:09:34 -0800132 val = clamp_val(val, -256000, 255000);
Jean Delvarecff37c92010-05-27 19:58:57 +0200133
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200134 mutex_lock(&tmp102->lock);
Jean Delvarecff37c92010-05-27 19:58:57 +0200135 tmp102->temp[sda->index] = val;
Jean Delvare90f41022011-11-04 12:00:47 +0100136 status = i2c_smbus_write_word_swapped(client, tmp102_reg[sda->index],
137 tmp102_mC_to_reg(val));
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200138 mutex_unlock(&tmp102->lock);
139 return status ? : count;
140}
141
142static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp102_show_temp, NULL , 0);
143
144static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, tmp102_show_temp,
145 tmp102_set_temp, 1);
146
147static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp102_show_temp,
148 tmp102_set_temp, 2);
149
Guenter Roeckad9beea2014-02-02 10:08:09 -0800150static struct attribute *tmp102_attrs[] = {
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200151 &sensor_dev_attr_temp1_input.dev_attr.attr,
152 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
153 &sensor_dev_attr_temp1_max.dev_attr.attr,
154 NULL
155};
Guenter Roeckad9beea2014-02-02 10:08:09 -0800156ATTRIBUTE_GROUPS(tmp102);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200157
158#define TMP102_CONFIG (TMP102_CONF_TM | TMP102_CONF_EM | TMP102_CONF_CR1)
159#define TMP102_CONFIG_RD_ONLY (TMP102_CONF_R0 | TMP102_CONF_R1 | TMP102_CONF_AL)
160
Eduardo Valentin2251aef2014-11-07 21:24:39 -0400161static const struct thermal_zone_of_device_ops tmp102_of_thermal_ops = {
162 .get_temp = tmp102_read_temp,
163};
164
Bill Pemberton6c931ae2012-11-19 13:22:35 -0500165static int tmp102_probe(struct i2c_client *client,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200166 const struct i2c_device_id *id)
167{
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800168 struct device *dev = &client->dev;
Guenter Roeckad9beea2014-02-02 10:08:09 -0800169 struct device *hwmon_dev;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200170 struct tmp102 *tmp102;
171 int status;
172
Jean Delvarecff37c92010-05-27 19:58:57 +0200173 if (!i2c_check_functionality(client->adapter,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200174 I2C_FUNC_SMBUS_WORD_DATA)) {
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800175 dev_err(dev,
Guenter Roeckb55f3752013-01-10 10:01:24 -0800176 "adapter doesn't support SMBus word transactions\n");
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200177 return -ENODEV;
178 }
179
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800180 tmp102 = devm_kzalloc(dev, sizeof(*tmp102), GFP_KERNEL);
Guenter Roeckf511a212012-06-02 11:35:52 -0700181 if (!tmp102)
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200182 return -ENOMEM;
Guenter Roeckf511a212012-06-02 11:35:52 -0700183
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200184 i2c_set_clientdata(client, tmp102);
Guenter Roeckad9beea2014-02-02 10:08:09 -0800185 tmp102->client = client;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200186
Jean Delvare90f41022011-11-04 12:00:47 +0100187 status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Jean Delvare38806bd2010-05-27 19:58:59 +0200188 if (status < 0) {
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800189 dev_err(dev, "error reading config register\n");
Guenter Roeckf511a212012-06-02 11:35:52 -0700190 return status;
Jean Delvare38806bd2010-05-27 19:58:59 +0200191 }
192 tmp102->config_orig = status;
Jean Delvare90f41022011-11-04 12:00:47 +0100193 status = i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
194 TMP102_CONFIG);
Jean Delvarecff37c92010-05-27 19:58:57 +0200195 if (status < 0) {
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800196 dev_err(dev, "error writing config register\n");
Jean Delvare38806bd2010-05-27 19:58:59 +0200197 goto fail_restore_config;
Jean Delvarecff37c92010-05-27 19:58:57 +0200198 }
Jean Delvare90f41022011-11-04 12:00:47 +0100199 status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200200 if (status < 0) {
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800201 dev_err(dev, "error reading config register\n");
Jean Delvare38806bd2010-05-27 19:58:59 +0200202 goto fail_restore_config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200203 }
204 status &= ~TMP102_CONFIG_RD_ONLY;
205 if (status != TMP102_CONFIG) {
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800206 dev_err(dev, "config settings did not stick\n");
Jean Delvarecff37c92010-05-27 19:58:57 +0200207 status = -ENODEV;
Jean Delvare38806bd2010-05-27 19:58:59 +0200208 goto fail_restore_config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200209 }
210 tmp102->last_update = jiffies - HZ;
211 mutex_init(&tmp102->lock);
212
Guenter Roeckad9beea2014-02-02 10:08:09 -0800213 hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
214 tmp102, tmp102_groups);
215 if (IS_ERR(hwmon_dev)) {
216 dev_dbg(dev, "unable to register hwmon device\n");
217 status = PTR_ERR(hwmon_dev);
Jean Delvare38806bd2010-05-27 19:58:59 +0200218 goto fail_restore_config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200219 }
Guenter Roeckad9beea2014-02-02 10:08:09 -0800220 tmp102->hwmon_dev = hwmon_dev;
221 tmp102->tz = thermal_zone_of_sensor_register(hwmon_dev, 0, hwmon_dev,
Eduardo Valentin2251aef2014-11-07 21:24:39 -0400222 &tmp102_of_thermal_ops);
Eduardo Valentin6a027522013-07-16 14:57:51 -0400223 if (IS_ERR(tmp102->tz))
224 tmp102->tz = NULL;
225
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800226 dev_info(dev, "initialized\n");
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200227
228 return 0;
Jean Delvare38806bd2010-05-27 19:58:59 +0200229
Jean Delvare38806bd2010-05-27 19:58:59 +0200230fail_restore_config:
Jean Delvare90f41022011-11-04 12:00:47 +0100231 i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
232 tmp102->config_orig);
Jean Delvarecff37c92010-05-27 19:58:57 +0200233 return status;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200234}
235
Bill Pemberton281dfd02012-11-19 13:25:51 -0500236static int tmp102_remove(struct i2c_client *client)
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200237{
238 struct tmp102 *tmp102 = i2c_get_clientdata(client);
239
Guenter Roeckad9beea2014-02-02 10:08:09 -0800240 thermal_zone_of_sensor_unregister(tmp102->hwmon_dev, tmp102->tz);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200241 hwmon_device_unregister(tmp102->hwmon_dev);
Jean Delvare38806bd2010-05-27 19:58:59 +0200242
243 /* Stop monitoring if device was stopped originally */
244 if (tmp102->config_orig & TMP102_CONF_SD) {
245 int config;
246
Jean Delvare90f41022011-11-04 12:00:47 +0100247 config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Jean Delvare38806bd2010-05-27 19:58:59 +0200248 if (config >= 0)
Jean Delvare90f41022011-11-04 12:00:47 +0100249 i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
250 config | TMP102_CONF_SD);
Jean Delvare38806bd2010-05-27 19:58:59 +0200251 }
252
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200253 return 0;
254}
255
Grygorii Strashkodd378b12015-02-03 17:01:58 +0200256#ifdef CONFIG_PM_SLEEP
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200257static int tmp102_suspend(struct device *dev)
258{
259 struct i2c_client *client = to_i2c_client(dev);
Jean Delvare8d4dee92010-05-27 19:58:58 +0200260 int config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200261
Jean Delvare90f41022011-11-04 12:00:47 +0100262 config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Jean Delvare8d4dee92010-05-27 19:58:58 +0200263 if (config < 0)
264 return config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200265
Jean Delvare8d4dee92010-05-27 19:58:58 +0200266 config |= TMP102_CONF_SD;
Jean Delvare90f41022011-11-04 12:00:47 +0100267 return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200268}
269
270static int tmp102_resume(struct device *dev)
271{
272 struct i2c_client *client = to_i2c_client(dev);
Jean Delvare8d4dee92010-05-27 19:58:58 +0200273 int config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200274
Jean Delvare90f41022011-11-04 12:00:47 +0100275 config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Jean Delvare8d4dee92010-05-27 19:58:58 +0200276 if (config < 0)
277 return config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200278
Jean Delvare8d4dee92010-05-27 19:58:58 +0200279 config &= ~TMP102_CONF_SD;
Jean Delvare90f41022011-11-04 12:00:47 +0100280 return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200281}
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200282#endif /* CONFIG_PM */
283
Grygorii Strashkodd378b12015-02-03 17:01:58 +0200284static SIMPLE_DEV_PM_OPS(tmp102_dev_pm_ops, tmp102_suspend, tmp102_resume);
285
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200286static const struct i2c_device_id tmp102_id[] = {
Jean Delvarecff37c92010-05-27 19:58:57 +0200287 { "tmp102", 0 },
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200288 { }
289};
Jean Delvarecff37c92010-05-27 19:58:57 +0200290MODULE_DEVICE_TABLE(i2c, tmp102_id);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200291
292static struct i2c_driver tmp102_driver = {
293 .driver.name = DRIVER_NAME,
Grygorii Strashkodd378b12015-02-03 17:01:58 +0200294 .driver.pm = &tmp102_dev_pm_ops,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200295 .probe = tmp102_probe,
Bill Pemberton9e5e9b72012-11-19 13:21:20 -0500296 .remove = tmp102_remove,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200297 .id_table = tmp102_id,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200298};
299
Axel Linf0967ee2012-01-20 15:38:18 +0800300module_i2c_driver(tmp102_driver);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200301
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200302MODULE_AUTHOR("Steven King <sfking@fdwdc.com>");
303MODULE_DESCRIPTION("Texas Instruments TMP102 temperature sensor driver");
304MODULE_LICENSE("GPL");