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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
Eduardo Valentin6a027522013-07-16 14:57:51 -0400101static int tmp102_read_temp(void *dev, long *temp)
102{
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
Bill Pemberton6c931ae2012-11-19 13:22:35 -0500161static int tmp102_probe(struct i2c_client *client,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200162 const struct i2c_device_id *id)
163{
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800164 struct device *dev = &client->dev;
Guenter Roeckad9beea2014-02-02 10:08:09 -0800165 struct device *hwmon_dev;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200166 struct tmp102 *tmp102;
167 int status;
168
Jean Delvarecff37c92010-05-27 19:58:57 +0200169 if (!i2c_check_functionality(client->adapter,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200170 I2C_FUNC_SMBUS_WORD_DATA)) {
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800171 dev_err(dev,
Guenter Roeckb55f3752013-01-10 10:01:24 -0800172 "adapter doesn't support SMBus word transactions\n");
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200173 return -ENODEV;
174 }
175
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800176 tmp102 = devm_kzalloc(dev, sizeof(*tmp102), GFP_KERNEL);
Guenter Roeckf511a212012-06-02 11:35:52 -0700177 if (!tmp102)
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200178 return -ENOMEM;
Guenter Roeckf511a212012-06-02 11:35:52 -0700179
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200180 i2c_set_clientdata(client, tmp102);
Guenter Roeckad9beea2014-02-02 10:08:09 -0800181 tmp102->client = client;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200182
Jean Delvare90f41022011-11-04 12:00:47 +0100183 status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Jean Delvare38806bd2010-05-27 19:58:59 +0200184 if (status < 0) {
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800185 dev_err(dev, "error reading config register\n");
Guenter Roeckf511a212012-06-02 11:35:52 -0700186 return status;
Jean Delvare38806bd2010-05-27 19:58:59 +0200187 }
188 tmp102->config_orig = status;
Jean Delvare90f41022011-11-04 12:00:47 +0100189 status = i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
190 TMP102_CONFIG);
Jean Delvarecff37c92010-05-27 19:58:57 +0200191 if (status < 0) {
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800192 dev_err(dev, "error writing config register\n");
Jean Delvare38806bd2010-05-27 19:58:59 +0200193 goto fail_restore_config;
Jean Delvarecff37c92010-05-27 19:58:57 +0200194 }
Jean Delvare90f41022011-11-04 12:00:47 +0100195 status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200196 if (status < 0) {
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800197 dev_err(dev, "error reading config register\n");
Jean Delvare38806bd2010-05-27 19:58:59 +0200198 goto fail_restore_config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200199 }
200 status &= ~TMP102_CONFIG_RD_ONLY;
201 if (status != TMP102_CONFIG) {
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800202 dev_err(dev, "config settings did not stick\n");
Jean Delvarecff37c92010-05-27 19:58:57 +0200203 status = -ENODEV;
Jean Delvare38806bd2010-05-27 19:58:59 +0200204 goto fail_restore_config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200205 }
206 tmp102->last_update = jiffies - HZ;
207 mutex_init(&tmp102->lock);
208
Guenter Roeckad9beea2014-02-02 10:08:09 -0800209 hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
210 tmp102, tmp102_groups);
211 if (IS_ERR(hwmon_dev)) {
212 dev_dbg(dev, "unable to register hwmon device\n");
213 status = PTR_ERR(hwmon_dev);
Jean Delvare38806bd2010-05-27 19:58:59 +0200214 goto fail_restore_config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200215 }
Guenter Roeckad9beea2014-02-02 10:08:09 -0800216 tmp102->hwmon_dev = hwmon_dev;
217 tmp102->tz = thermal_zone_of_sensor_register(hwmon_dev, 0, hwmon_dev,
Eduardo Valentin6a027522013-07-16 14:57:51 -0400218 tmp102_read_temp, NULL);
219 if (IS_ERR(tmp102->tz))
220 tmp102->tz = NULL;
221
Guenter Roeckfbd9af12014-02-02 14:22:30 -0800222 dev_info(dev, "initialized\n");
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200223
224 return 0;
Jean Delvare38806bd2010-05-27 19:58:59 +0200225
Jean Delvare38806bd2010-05-27 19:58:59 +0200226fail_restore_config:
Jean Delvare90f41022011-11-04 12:00:47 +0100227 i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
228 tmp102->config_orig);
Jean Delvarecff37c92010-05-27 19:58:57 +0200229 return status;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200230}
231
Bill Pemberton281dfd02012-11-19 13:25:51 -0500232static int tmp102_remove(struct i2c_client *client)
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200233{
234 struct tmp102 *tmp102 = i2c_get_clientdata(client);
235
Guenter Roeckad9beea2014-02-02 10:08:09 -0800236 thermal_zone_of_sensor_unregister(tmp102->hwmon_dev, tmp102->tz);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200237 hwmon_device_unregister(tmp102->hwmon_dev);
Jean Delvare38806bd2010-05-27 19:58:59 +0200238
239 /* Stop monitoring if device was stopped originally */
240 if (tmp102->config_orig & TMP102_CONF_SD) {
241 int config;
242
Jean Delvare90f41022011-11-04 12:00:47 +0100243 config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Jean Delvare38806bd2010-05-27 19:58:59 +0200244 if (config >= 0)
Jean Delvare90f41022011-11-04 12:00:47 +0100245 i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
246 config | TMP102_CONF_SD);
Jean Delvare38806bd2010-05-27 19:58:59 +0200247 }
248
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200249 return 0;
250}
251
252#ifdef CONFIG_PM
253static int tmp102_suspend(struct device *dev)
254{
255 struct i2c_client *client = to_i2c_client(dev);
Jean Delvare8d4dee92010-05-27 19:58:58 +0200256 int config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200257
Jean Delvare90f41022011-11-04 12:00:47 +0100258 config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Jean Delvare8d4dee92010-05-27 19:58:58 +0200259 if (config < 0)
260 return config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200261
Jean Delvare8d4dee92010-05-27 19:58:58 +0200262 config |= TMP102_CONF_SD;
Jean Delvare90f41022011-11-04 12:00:47 +0100263 return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200264}
265
266static int tmp102_resume(struct device *dev)
267{
268 struct i2c_client *client = to_i2c_client(dev);
Jean Delvare8d4dee92010-05-27 19:58:58 +0200269 int config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200270
Jean Delvare90f41022011-11-04 12:00:47 +0100271 config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Jean Delvare8d4dee92010-05-27 19:58:58 +0200272 if (config < 0)
273 return config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200274
Jean Delvare8d4dee92010-05-27 19:58:58 +0200275 config &= ~TMP102_CONF_SD;
Jean Delvare90f41022011-11-04 12:00:47 +0100276 return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200277}
278
279static const struct dev_pm_ops tmp102_dev_pm_ops = {
280 .suspend = tmp102_suspend,
281 .resume = tmp102_resume,
282};
283
284#define TMP102_DEV_PM_OPS (&tmp102_dev_pm_ops)
285#else
286#define TMP102_DEV_PM_OPS NULL
287#endif /* CONFIG_PM */
288
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200289static const struct i2c_device_id tmp102_id[] = {
Jean Delvarecff37c92010-05-27 19:58:57 +0200290 { "tmp102", 0 },
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200291 { }
292};
Jean Delvarecff37c92010-05-27 19:58:57 +0200293MODULE_DEVICE_TABLE(i2c, tmp102_id);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200294
295static struct i2c_driver tmp102_driver = {
296 .driver.name = DRIVER_NAME,
297 .driver.pm = TMP102_DEV_PM_OPS,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200298 .probe = tmp102_probe,
Bill Pemberton9e5e9b72012-11-19 13:21:20 -0500299 .remove = tmp102_remove,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200300 .id_table = tmp102_id,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200301};
302
Axel Linf0967ee2012-01-20 15:38:18 +0800303module_i2c_driver(tmp102_driver);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200304
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200305MODULE_AUTHOR("Steven King <sfking@fdwdc.com>");
306MODULE_DESCRIPTION("Texas Instruments TMP102 temperature sensor driver");
307MODULE_LICENSE("GPL");