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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>
Steven Kingbeb1b6b2010-05-27 19:58:56 +020030
31#define DRIVER_NAME "tmp102"
32
33#define TMP102_TEMP_REG 0x00
34#define TMP102_CONF_REG 0x01
35/* note: these bit definitions are byte swapped */
36#define TMP102_CONF_SD 0x0100
37#define TMP102_CONF_TM 0x0200
38#define TMP102_CONF_POL 0x0400
39#define TMP102_CONF_F0 0x0800
40#define TMP102_CONF_F1 0x1000
41#define TMP102_CONF_R0 0x2000
42#define TMP102_CONF_R1 0x4000
43#define TMP102_CONF_OS 0x8000
44#define TMP102_CONF_EM 0x0010
45#define TMP102_CONF_AL 0x0020
46#define TMP102_CONF_CR0 0x0040
47#define TMP102_CONF_CR1 0x0080
48#define TMP102_TLOW_REG 0x02
49#define TMP102_THIGH_REG 0x03
50
51struct tmp102 {
52 struct device *hwmon_dev;
53 struct mutex lock;
Jean Delvare38806bd2010-05-27 19:58:59 +020054 u16 config_orig;
Steven Kingbeb1b6b2010-05-27 19:58:56 +020055 unsigned long last_update;
56 int temp[3];
57};
58
Jean Delvarecff37c92010-05-27 19:58:57 +020059/* convert left adjusted 13-bit TMP102 register value to milliCelsius */
60static inline int tmp102_reg_to_mC(s16 val)
Steven Kingbeb1b6b2010-05-27 19:58:56 +020061{
Jean Delvarecff37c92010-05-27 19:58:57 +020062 return ((val & ~0x01) * 1000) / 128;
Steven Kingbeb1b6b2010-05-27 19:58:56 +020063}
64
Jean Delvarecff37c92010-05-27 19:58:57 +020065/* convert milliCelsius to left adjusted 13-bit TMP102 register value */
66static inline u16 tmp102_mC_to_reg(int val)
Steven Kingbeb1b6b2010-05-27 19:58:56 +020067{
68 return (val * 128) / 1000;
69}
70
71static const u8 tmp102_reg[] = {
72 TMP102_TEMP_REG,
73 TMP102_TLOW_REG,
74 TMP102_THIGH_REG,
75};
76
77static struct tmp102 *tmp102_update_device(struct i2c_client *client)
78{
79 struct tmp102 *tmp102 = i2c_get_clientdata(client);
80
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;
91 }
92 mutex_unlock(&tmp102->lock);
93 return tmp102;
94}
95
96static ssize_t tmp102_show_temp(struct device *dev,
97 struct device_attribute *attr,
98 char *buf)
99{
100 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
101 struct tmp102 *tmp102 = tmp102_update_device(to_i2c_client(dev));
102
103 return sprintf(buf, "%d\n", tmp102->temp[sda->index]);
104}
105
106static ssize_t tmp102_set_temp(struct device *dev,
107 struct device_attribute *attr,
108 const char *buf, size_t count)
109{
110 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
111 struct i2c_client *client = to_i2c_client(dev);
112 struct tmp102 *tmp102 = i2c_get_clientdata(client);
113 long val;
Jean Delvarecff37c92010-05-27 19:58:57 +0200114 int status;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200115
Frans Meulenbroeks179c4fd2012-01-04 20:58:52 +0100116 if (kstrtol(buf, 10, &val) < 0)
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200117 return -EINVAL;
Guenter Roeck2a844c12013-01-09 08:09:34 -0800118 val = clamp_val(val, -256000, 255000);
Jean Delvarecff37c92010-05-27 19:58:57 +0200119
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200120 mutex_lock(&tmp102->lock);
Jean Delvarecff37c92010-05-27 19:58:57 +0200121 tmp102->temp[sda->index] = val;
Jean Delvare90f41022011-11-04 12:00:47 +0100122 status = i2c_smbus_write_word_swapped(client, tmp102_reg[sda->index],
123 tmp102_mC_to_reg(val));
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200124 mutex_unlock(&tmp102->lock);
125 return status ? : count;
126}
127
128static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp102_show_temp, NULL , 0);
129
130static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, tmp102_show_temp,
131 tmp102_set_temp, 1);
132
133static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp102_show_temp,
134 tmp102_set_temp, 2);
135
136static struct attribute *tmp102_attributes[] = {
137 &sensor_dev_attr_temp1_input.dev_attr.attr,
138 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
139 &sensor_dev_attr_temp1_max.dev_attr.attr,
140 NULL
141};
142
143static const struct attribute_group tmp102_attr_group = {
144 .attrs = tmp102_attributes,
145};
146
147#define TMP102_CONFIG (TMP102_CONF_TM | TMP102_CONF_EM | TMP102_CONF_CR1)
148#define TMP102_CONFIG_RD_ONLY (TMP102_CONF_R0 | TMP102_CONF_R1 | TMP102_CONF_AL)
149
Bill Pemberton6c931ae2012-11-19 13:22:35 -0500150static int tmp102_probe(struct i2c_client *client,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200151 const struct i2c_device_id *id)
152{
153 struct tmp102 *tmp102;
154 int status;
155
Jean Delvarecff37c92010-05-27 19:58:57 +0200156 if (!i2c_check_functionality(client->adapter,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200157 I2C_FUNC_SMBUS_WORD_DATA)) {
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300158 dev_err(&client->dev, "adapter doesn't support SMBus word "
Jean Delvarecff37c92010-05-27 19:58:57 +0200159 "transactions\n");
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200160 return -ENODEV;
161 }
162
Guenter Roeckf511a212012-06-02 11:35:52 -0700163 tmp102 = devm_kzalloc(&client->dev, sizeof(*tmp102), GFP_KERNEL);
164 if (!tmp102)
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200165 return -ENOMEM;
Guenter Roeckf511a212012-06-02 11:35:52 -0700166
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200167 i2c_set_clientdata(client, tmp102);
168
Jean Delvare90f41022011-11-04 12:00:47 +0100169 status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Jean Delvare38806bd2010-05-27 19:58:59 +0200170 if (status < 0) {
171 dev_err(&client->dev, "error reading config register\n");
Guenter Roeckf511a212012-06-02 11:35:52 -0700172 return status;
Jean Delvare38806bd2010-05-27 19:58:59 +0200173 }
174 tmp102->config_orig = status;
Jean Delvare90f41022011-11-04 12:00:47 +0100175 status = i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
176 TMP102_CONFIG);
Jean Delvarecff37c92010-05-27 19:58:57 +0200177 if (status < 0) {
178 dev_err(&client->dev, "error writing config register\n");
Jean Delvare38806bd2010-05-27 19:58:59 +0200179 goto fail_restore_config;
Jean Delvarecff37c92010-05-27 19:58:57 +0200180 }
Jean Delvare90f41022011-11-04 12:00:47 +0100181 status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200182 if (status < 0) {
Jean Delvarecff37c92010-05-27 19:58:57 +0200183 dev_err(&client->dev, "error reading config register\n");
Jean Delvare38806bd2010-05-27 19:58:59 +0200184 goto fail_restore_config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200185 }
186 status &= ~TMP102_CONFIG_RD_ONLY;
187 if (status != TMP102_CONFIG) {
Jean Delvarecff37c92010-05-27 19:58:57 +0200188 dev_err(&client->dev, "config settings did not stick\n");
189 status = -ENODEV;
Jean Delvare38806bd2010-05-27 19:58:59 +0200190 goto fail_restore_config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200191 }
192 tmp102->last_update = jiffies - HZ;
193 mutex_init(&tmp102->lock);
194
195 status = sysfs_create_group(&client->dev.kobj, &tmp102_attr_group);
196 if (status) {
197 dev_dbg(&client->dev, "could not create sysfs files\n");
Jean Delvare38806bd2010-05-27 19:58:59 +0200198 goto fail_restore_config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200199 }
200 tmp102->hwmon_dev = hwmon_device_register(&client->dev);
201 if (IS_ERR(tmp102->hwmon_dev)) {
202 dev_dbg(&client->dev, "unable to register hwmon device\n");
203 status = PTR_ERR(tmp102->hwmon_dev);
Jean Delvare38806bd2010-05-27 19:58:59 +0200204 goto fail_remove_sysfs;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200205 }
206
207 dev_info(&client->dev, "initialized\n");
208
209 return 0;
Jean Delvare38806bd2010-05-27 19:58:59 +0200210
211fail_remove_sysfs:
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200212 sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group);
Jean Delvare38806bd2010-05-27 19:58:59 +0200213fail_restore_config:
Jean Delvare90f41022011-11-04 12:00:47 +0100214 i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
215 tmp102->config_orig);
Jean Delvarecff37c92010-05-27 19:58:57 +0200216 return status;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200217}
218
Bill Pemberton281dfd02012-11-19 13:25:51 -0500219static int tmp102_remove(struct i2c_client *client)
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200220{
221 struct tmp102 *tmp102 = i2c_get_clientdata(client);
222
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200223 hwmon_device_unregister(tmp102->hwmon_dev);
224 sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group);
Jean Delvare38806bd2010-05-27 19:58:59 +0200225
226 /* Stop monitoring if device was stopped originally */
227 if (tmp102->config_orig & TMP102_CONF_SD) {
228 int config;
229
Jean Delvare90f41022011-11-04 12:00:47 +0100230 config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Jean Delvare38806bd2010-05-27 19:58:59 +0200231 if (config >= 0)
Jean Delvare90f41022011-11-04 12:00:47 +0100232 i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
233 config | TMP102_CONF_SD);
Jean Delvare38806bd2010-05-27 19:58:59 +0200234 }
235
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200236 return 0;
237}
238
239#ifdef CONFIG_PM
240static int tmp102_suspend(struct device *dev)
241{
242 struct i2c_client *client = to_i2c_client(dev);
Jean Delvare8d4dee92010-05-27 19:58:58 +0200243 int config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200244
Jean Delvare90f41022011-11-04 12:00:47 +0100245 config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Jean Delvare8d4dee92010-05-27 19:58:58 +0200246 if (config < 0)
247 return config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200248
Jean Delvare8d4dee92010-05-27 19:58:58 +0200249 config |= TMP102_CONF_SD;
Jean Delvare90f41022011-11-04 12:00:47 +0100250 return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200251}
252
253static int tmp102_resume(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 const struct dev_pm_ops tmp102_dev_pm_ops = {
267 .suspend = tmp102_suspend,
268 .resume = tmp102_resume,
269};
270
271#define TMP102_DEV_PM_OPS (&tmp102_dev_pm_ops)
272#else
273#define TMP102_DEV_PM_OPS NULL
274#endif /* CONFIG_PM */
275
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200276static const struct i2c_device_id tmp102_id[] = {
Jean Delvarecff37c92010-05-27 19:58:57 +0200277 { "tmp102", 0 },
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200278 { }
279};
Jean Delvarecff37c92010-05-27 19:58:57 +0200280MODULE_DEVICE_TABLE(i2c, tmp102_id);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200281
282static struct i2c_driver tmp102_driver = {
283 .driver.name = DRIVER_NAME,
284 .driver.pm = TMP102_DEV_PM_OPS,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200285 .probe = tmp102_probe,
Bill Pemberton9e5e9b72012-11-19 13:21:20 -0500286 .remove = tmp102_remove,
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");