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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>
Steven Kingbeb1b6b2010-05-27 19:58:56 +020029
30#define DRIVER_NAME "tmp102"
31
32#define TMP102_TEMP_REG 0x00
33#define TMP102_CONF_REG 0x01
34/* note: these bit definitions are byte swapped */
35#define TMP102_CONF_SD 0x0100
36#define TMP102_CONF_TM 0x0200
37#define TMP102_CONF_POL 0x0400
38#define TMP102_CONF_F0 0x0800
39#define TMP102_CONF_F1 0x1000
40#define TMP102_CONF_R0 0x2000
41#define TMP102_CONF_R1 0x4000
42#define TMP102_CONF_OS 0x8000
43#define TMP102_CONF_EM 0x0010
44#define TMP102_CONF_AL 0x0020
45#define TMP102_CONF_CR0 0x0040
46#define TMP102_CONF_CR1 0x0080
47#define TMP102_TLOW_REG 0x02
48#define TMP102_THIGH_REG 0x03
49
50struct tmp102 {
51 struct device *hwmon_dev;
52 struct mutex lock;
Jean Delvare38806bd2010-05-27 19:58:59 +020053 u16 config_orig;
Steven Kingbeb1b6b2010-05-27 19:58:56 +020054 unsigned long last_update;
55 int temp[3];
56};
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
76static struct tmp102 *tmp102_update_device(struct i2c_client *client)
77{
78 struct tmp102 *tmp102 = i2c_get_clientdata(client);
79
80 mutex_lock(&tmp102->lock);
Jean Delvarecff37c92010-05-27 19:58:57 +020081 if (time_after(jiffies, tmp102->last_update + HZ / 3)) {
Steven Kingbeb1b6b2010-05-27 19:58:56 +020082 int i;
83 for (i = 0; i < ARRAY_SIZE(tmp102->temp); ++i) {
Jean Delvare90f41022011-11-04 12:00:47 +010084 int status = i2c_smbus_read_word_swapped(client,
85 tmp102_reg[i]);
Steven Kingbeb1b6b2010-05-27 19:58:56 +020086 if (status > -1)
87 tmp102->temp[i] = tmp102_reg_to_mC(status);
88 }
89 tmp102->last_update = jiffies;
90 }
91 mutex_unlock(&tmp102->lock);
92 return tmp102;
93}
94
95static ssize_t tmp102_show_temp(struct device *dev,
96 struct device_attribute *attr,
97 char *buf)
98{
99 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
100 struct tmp102 *tmp102 = tmp102_update_device(to_i2c_client(dev));
101
102 return sprintf(buf, "%d\n", tmp102->temp[sda->index]);
103}
104
105static ssize_t tmp102_set_temp(struct device *dev,
106 struct device_attribute *attr,
107 const char *buf, size_t count)
108{
109 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
110 struct i2c_client *client = to_i2c_client(dev);
111 struct tmp102 *tmp102 = i2c_get_clientdata(client);
112 long val;
Jean Delvarecff37c92010-05-27 19:58:57 +0200113 int status;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200114
Jean Delvarecff37c92010-05-27 19:58:57 +0200115 if (strict_strtol(buf, 10, &val) < 0)
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200116 return -EINVAL;
Jean Delvarecff37c92010-05-27 19:58:57 +0200117 val = SENSORS_LIMIT(val, -256000, 255000);
118
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200119 mutex_lock(&tmp102->lock);
Jean Delvarecff37c92010-05-27 19:58:57 +0200120 tmp102->temp[sda->index] = val;
Jean Delvare90f41022011-11-04 12:00:47 +0100121 status = i2c_smbus_write_word_swapped(client, tmp102_reg[sda->index],
122 tmp102_mC_to_reg(val));
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200123 mutex_unlock(&tmp102->lock);
124 return status ? : count;
125}
126
127static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp102_show_temp, NULL , 0);
128
129static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, tmp102_show_temp,
130 tmp102_set_temp, 1);
131
132static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp102_show_temp,
133 tmp102_set_temp, 2);
134
135static struct attribute *tmp102_attributes[] = {
136 &sensor_dev_attr_temp1_input.dev_attr.attr,
137 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
138 &sensor_dev_attr_temp1_max.dev_attr.attr,
139 NULL
140};
141
142static const struct attribute_group tmp102_attr_group = {
143 .attrs = tmp102_attributes,
144};
145
146#define TMP102_CONFIG (TMP102_CONF_TM | TMP102_CONF_EM | TMP102_CONF_CR1)
147#define TMP102_CONFIG_RD_ONLY (TMP102_CONF_R0 | TMP102_CONF_R1 | TMP102_CONF_AL)
148
149static int __devinit tmp102_probe(struct i2c_client *client,
150 const struct i2c_device_id *id)
151{
152 struct tmp102 *tmp102;
153 int status;
154
Jean Delvarecff37c92010-05-27 19:58:57 +0200155 if (!i2c_check_functionality(client->adapter,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200156 I2C_FUNC_SMBUS_WORD_DATA)) {
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300157 dev_err(&client->dev, "adapter doesn't support SMBus word "
Jean Delvarecff37c92010-05-27 19:58:57 +0200158 "transactions\n");
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200159 return -ENODEV;
160 }
161
162 tmp102 = kzalloc(sizeof(*tmp102), GFP_KERNEL);
163 if (!tmp102) {
164 dev_dbg(&client->dev, "kzalloc failed\n");
165 return -ENOMEM;
166 }
167 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");
172 goto fail_free;
173 }
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 Delvare38806bd2010-05-27 19:58:59 +0200216fail_free:
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200217 kfree(tmp102);
218
Jean Delvarecff37c92010-05-27 19:58:57 +0200219 return status;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200220}
221
222static int __devexit tmp102_remove(struct i2c_client *client)
223{
224 struct tmp102 *tmp102 = i2c_get_clientdata(client);
225
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200226 hwmon_device_unregister(tmp102->hwmon_dev);
227 sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group);
Jean Delvare38806bd2010-05-27 19:58:59 +0200228
229 /* Stop monitoring if device was stopped originally */
230 if (tmp102->config_orig & TMP102_CONF_SD) {
231 int config;
232
Jean Delvare90f41022011-11-04 12:00:47 +0100233 config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Jean Delvare38806bd2010-05-27 19:58:59 +0200234 if (config >= 0)
Jean Delvare90f41022011-11-04 12:00:47 +0100235 i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
236 config | TMP102_CONF_SD);
Jean Delvare38806bd2010-05-27 19:58:59 +0200237 }
238
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200239 kfree(tmp102);
240
241 return 0;
242}
243
244#ifdef CONFIG_PM
245static int tmp102_suspend(struct device *dev)
246{
247 struct i2c_client *client = to_i2c_client(dev);
Jean Delvare8d4dee92010-05-27 19:58:58 +0200248 int config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200249
Jean Delvare90f41022011-11-04 12:00:47 +0100250 config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Jean Delvare8d4dee92010-05-27 19:58:58 +0200251 if (config < 0)
252 return config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200253
Jean Delvare8d4dee92010-05-27 19:58:58 +0200254 config |= TMP102_CONF_SD;
Jean Delvare90f41022011-11-04 12:00:47 +0100255 return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200256}
257
258static int tmp102_resume(struct device *dev)
259{
260 struct i2c_client *client = to_i2c_client(dev);
Jean Delvare8d4dee92010-05-27 19:58:58 +0200261 int config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200262
Jean Delvare90f41022011-11-04 12:00:47 +0100263 config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
Jean Delvare8d4dee92010-05-27 19:58:58 +0200264 if (config < 0)
265 return config;
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200266
Jean Delvare8d4dee92010-05-27 19:58:58 +0200267 config &= ~TMP102_CONF_SD;
Jean Delvare90f41022011-11-04 12:00:47 +0100268 return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200269}
270
271static const struct dev_pm_ops tmp102_dev_pm_ops = {
272 .suspend = tmp102_suspend,
273 .resume = tmp102_resume,
274};
275
276#define TMP102_DEV_PM_OPS (&tmp102_dev_pm_ops)
277#else
278#define TMP102_DEV_PM_OPS NULL
279#endif /* CONFIG_PM */
280
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200281static const struct i2c_device_id tmp102_id[] = {
Jean Delvarecff37c92010-05-27 19:58:57 +0200282 { "tmp102", 0 },
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200283 { }
284};
Jean Delvarecff37c92010-05-27 19:58:57 +0200285MODULE_DEVICE_TABLE(i2c, tmp102_id);
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200286
287static struct i2c_driver tmp102_driver = {
288 .driver.name = DRIVER_NAME,
289 .driver.pm = TMP102_DEV_PM_OPS,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200290 .probe = tmp102_probe,
291 .remove = __devexit_p(tmp102_remove),
292 .id_table = tmp102_id,
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200293};
294
295static int __init tmp102_init(void)
296{
297 return i2c_add_driver(&tmp102_driver);
298}
299module_init(tmp102_init);
300
301static void __exit tmp102_exit(void)
302{
303 i2c_del_driver(&tmp102_driver);
304}
305module_exit(tmp102_exit);
306
Steven Kingbeb1b6b2010-05-27 19:58:56 +0200307MODULE_AUTHOR("Steven King <sfking@fdwdc.com>");
308MODULE_DESCRIPTION("Texas Instruments TMP102 temperature sensor driver");
309MODULE_LICENSE("GPL");