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1/* Texas Instruments TMP102 SMBus temperature sensor driver
2 *
3 * Copyright (C) 2010 Steven King <sfking@fdwdc.com>
4 *
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
20#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>
28#include <linux/device.h>
29#include <linux/jiffies.h>
30#include <linux/thermal.h>
31#include <linux/of.h>
32
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 {
54 struct i2c_client *client;
55 struct device *hwmon_dev;
56 struct thermal_zone_device *tz;
57 struct mutex lock;
58 u16 config_orig;
59 unsigned long last_update;
60 int temp[3];
61 bool first_time;
62};
63
64/* convert left adjusted 13-bit TMP102 register value to milliCelsius */
65static inline int tmp102_reg_to_mC(s16 val)
66{
67 return ((val & ~0x01) * 1000) / 128;
68}
69
70/* convert milliCelsius to left adjusted 13-bit TMP102 register value */
71static inline u16 tmp102_mC_to_reg(int val)
72{
73 return (val * 128) / 1000;
74}
75
76static const u8 tmp102_reg[] = {
77 TMP102_TEMP_REG,
78 TMP102_TLOW_REG,
79 TMP102_THIGH_REG,
80};
81
82static struct tmp102 *tmp102_update_device(struct device *dev)
83{
84 struct tmp102 *tmp102 = dev_get_drvdata(dev);
85 struct i2c_client *client = tmp102->client;
86
87 mutex_lock(&tmp102->lock);
88 if (time_after(jiffies, tmp102->last_update + HZ / 3)) {
89 int i;
90 for (i = 0; i < ARRAY_SIZE(tmp102->temp); ++i) {
91 int status = i2c_smbus_read_word_swapped(client,
92 tmp102_reg[i]);
93 if (status > -1)
94 tmp102->temp[i] = tmp102_reg_to_mC(status);
95 }
96 tmp102->last_update = jiffies;
97 tmp102->first_time = false;
98 }
99 mutex_unlock(&tmp102->lock);
100 return tmp102;
101}
102
103static int tmp102_read_temp(void *dev, int *temp)
104{
105 struct tmp102 *tmp102 = tmp102_update_device(dev);
106
107 /* Is it too early even to return a conversion? */
108 if (tmp102->first_time) {
109 dev_dbg(dev, "%s: Conversion not ready yet..\n", __func__);
110 return -EAGAIN;
111 }
112
113 *temp = tmp102->temp[0];
114
115 return 0;
116}
117
118static ssize_t tmp102_show_temp(struct device *dev,
119 struct device_attribute *attr,
120 char *buf)
121{
122 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
123 struct tmp102 *tmp102 = tmp102_update_device(dev);
124
125 /* Is it too early even to return a read? */
126 if (tmp102->first_time)
127 return -EAGAIN;
128
129 return sprintf(buf, "%d\n", tmp102->temp[sda->index]);
130}
131
132static ssize_t tmp102_set_temp(struct device *dev,
133 struct device_attribute *attr,
134 const char *buf, size_t count)
135{
136 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
137 struct tmp102 *tmp102 = dev_get_drvdata(dev);
138 struct i2c_client *client = tmp102->client;
139 long val;
140 int status;
141
142 if (kstrtol(buf, 10, &val) < 0)
143 return -EINVAL;
144 val = clamp_val(val, -256000, 255000);
145
146 mutex_lock(&tmp102->lock);
147 tmp102->temp[sda->index] = val;
148 status = i2c_smbus_write_word_swapped(client, tmp102_reg[sda->index],
149 tmp102_mC_to_reg(val));
150 mutex_unlock(&tmp102->lock);
151 return status ? : count;
152}
153
154static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp102_show_temp, NULL , 0);
155
156static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, tmp102_show_temp,
157 tmp102_set_temp, 1);
158
159static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp102_show_temp,
160 tmp102_set_temp, 2);
161
162static struct attribute *tmp102_attrs[] = {
163 &sensor_dev_attr_temp1_input.dev_attr.attr,
164 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
165 &sensor_dev_attr_temp1_max.dev_attr.attr,
166 NULL
167};
168ATTRIBUTE_GROUPS(tmp102);
169
170#define TMP102_CONFIG (TMP102_CONF_TM | TMP102_CONF_EM | TMP102_CONF_CR1)
171#define TMP102_CONFIG_RD_ONLY (TMP102_CONF_R0 | TMP102_CONF_R1 | TMP102_CONF_AL)
172
173static const struct thermal_zone_of_device_ops tmp102_of_thermal_ops = {
174 .get_temp = tmp102_read_temp,
175};
176
177static int tmp102_probe(struct i2c_client *client,
178 const struct i2c_device_id *id)
179{
180 struct device *dev = &client->dev;
181 struct device *hwmon_dev;
182 struct tmp102 *tmp102;
183 int status;
184
185 if (!i2c_check_functionality(client->adapter,
186 I2C_FUNC_SMBUS_WORD_DATA)) {
187 dev_err(dev,
188 "adapter doesn't support SMBus word transactions\n");
189 return -ENODEV;
190 }
191
192 tmp102 = devm_kzalloc(dev, sizeof(*tmp102), GFP_KERNEL);
193 if (!tmp102)
194 return -ENOMEM;
195
196 i2c_set_clientdata(client, tmp102);
197 tmp102->client = client;
198
199 status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
200 if (status < 0) {
201 dev_err(dev, "error reading config register\n");
202 return status;
203 }
204 tmp102->config_orig = status;
205 status = i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
206 TMP102_CONFIG);
207 if (status < 0) {
208 dev_err(dev, "error writing config register\n");
209 goto fail_restore_config;
210 }
211 status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
212 if (status < 0) {
213 dev_err(dev, "error reading config register\n");
214 goto fail_restore_config;
215 }
216 status &= ~TMP102_CONFIG_RD_ONLY;
217 if (status != TMP102_CONFIG) {
218 dev_err(dev, "config settings did not stick\n");
219 status = -ENODEV;
220 goto fail_restore_config;
221 }
222 tmp102->last_update = jiffies;
223 /* Mark that we are not ready with data until conversion is complete */
224 tmp102->first_time = true;
225 mutex_init(&tmp102->lock);
226
227 hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
228 tmp102, tmp102_groups);
229 if (IS_ERR(hwmon_dev)) {
230 dev_dbg(dev, "unable to register hwmon device\n");
231 status = PTR_ERR(hwmon_dev);
232 goto fail_restore_config;
233 }
234 tmp102->hwmon_dev = hwmon_dev;
235 tmp102->tz = thermal_zone_of_sensor_register(hwmon_dev, 0, hwmon_dev,
236 &tmp102_of_thermal_ops);
237 if (IS_ERR(tmp102->tz))
238 tmp102->tz = NULL;
239
240 dev_info(dev, "initialized\n");
241
242 return 0;
243
244fail_restore_config:
245 i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
246 tmp102->config_orig);
247 return status;
248}
249
250static int tmp102_remove(struct i2c_client *client)
251{
252 struct tmp102 *tmp102 = i2c_get_clientdata(client);
253
254 thermal_zone_of_sensor_unregister(tmp102->hwmon_dev, tmp102->tz);
255 hwmon_device_unregister(tmp102->hwmon_dev);
256
257 /* Stop monitoring if device was stopped originally */
258 if (tmp102->config_orig & TMP102_CONF_SD) {
259 int config;
260
261 config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
262 if (config >= 0)
263 i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
264 config | TMP102_CONF_SD);
265 }
266
267 return 0;
268}
269
270#ifdef CONFIG_PM_SLEEP
271static int tmp102_suspend(struct device *dev)
272{
273 struct i2c_client *client = to_i2c_client(dev);
274 int config;
275
276 config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
277 if (config < 0)
278 return config;
279
280 config |= TMP102_CONF_SD;
281 return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config);
282}
283
284static int tmp102_resume(struct device *dev)
285{
286 struct i2c_client *client = to_i2c_client(dev);
287 int config;
288
289 config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
290 if (config < 0)
291 return config;
292
293 config &= ~TMP102_CONF_SD;
294 return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config);
295}
296#endif /* CONFIG_PM */
297
298static SIMPLE_DEV_PM_OPS(tmp102_dev_pm_ops, tmp102_suspend, tmp102_resume);
299
300static const struct i2c_device_id tmp102_id[] = {
301 { "tmp102", 0 },
302 { }
303};
304MODULE_DEVICE_TABLE(i2c, tmp102_id);
305
306static struct i2c_driver tmp102_driver = {
307 .driver.name = DRIVER_NAME,
308 .driver.pm = &tmp102_dev_pm_ops,
309 .probe = tmp102_probe,
310 .remove = tmp102_remove,
311 .id_table = tmp102_id,
312};
313
314module_i2c_driver(tmp102_driver);
315
316MODULE_AUTHOR("Steven King <sfking@fdwdc.com>");
317MODULE_DESCRIPTION("Texas Instruments TMP102 temperature sensor driver");
318MODULE_LICENSE("GPL");
1/* Texas Instruments TMP102 SMBus temperature sensor driver
2 *
3 * Copyright (C) 2010 Steven King <sfking@fdwdc.com>
4 *
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
20#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>
28#include <linux/device.h>
29#include <linux/jiffies.h>
30#include <linux/thermal.h>
31#include <linux/of.h>
32
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 {
54 struct device *hwmon_dev;
55 struct thermal_zone_device *tz;
56 struct mutex lock;
57 u16 config_orig;
58 unsigned long last_update;
59 int temp[3];
60};
61
62/* convert left adjusted 13-bit TMP102 register value to milliCelsius */
63static inline int tmp102_reg_to_mC(s16 val)
64{
65 return ((val & ~0x01) * 1000) / 128;
66}
67
68/* convert milliCelsius to left adjusted 13-bit TMP102 register value */
69static inline u16 tmp102_mC_to_reg(int val)
70{
71 return (val * 128) / 1000;
72}
73
74static const u8 tmp102_reg[] = {
75 TMP102_TEMP_REG,
76 TMP102_TLOW_REG,
77 TMP102_THIGH_REG,
78};
79
80static struct tmp102 *tmp102_update_device(struct i2c_client *client)
81{
82 struct tmp102 *tmp102 = i2c_get_clientdata(client);
83
84 mutex_lock(&tmp102->lock);
85 if (time_after(jiffies, tmp102->last_update + HZ / 3)) {
86 int i;
87 for (i = 0; i < ARRAY_SIZE(tmp102->temp); ++i) {
88 int status = i2c_smbus_read_word_swapped(client,
89 tmp102_reg[i]);
90 if (status > -1)
91 tmp102->temp[i] = tmp102_reg_to_mC(status);
92 }
93 tmp102->last_update = jiffies;
94 }
95 mutex_unlock(&tmp102->lock);
96 return tmp102;
97}
98
99static int tmp102_read_temp(void *dev, long *temp)
100{
101 struct tmp102 *tmp102 = tmp102_update_device(to_i2c_client(dev));
102
103 *temp = tmp102->temp[0];
104
105 return 0;
106}
107
108static ssize_t tmp102_show_temp(struct device *dev,
109 struct device_attribute *attr,
110 char *buf)
111{
112 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
113 struct tmp102 *tmp102 = tmp102_update_device(to_i2c_client(dev));
114
115 return sprintf(buf, "%d\n", tmp102->temp[sda->index]);
116}
117
118static ssize_t tmp102_set_temp(struct device *dev,
119 struct device_attribute *attr,
120 const char *buf, size_t count)
121{
122 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
123 struct i2c_client *client = to_i2c_client(dev);
124 struct tmp102 *tmp102 = i2c_get_clientdata(client);
125 long val;
126 int status;
127
128 if (kstrtol(buf, 10, &val) < 0)
129 return -EINVAL;
130 val = clamp_val(val, -256000, 255000);
131
132 mutex_lock(&tmp102->lock);
133 tmp102->temp[sda->index] = val;
134 status = i2c_smbus_write_word_swapped(client, tmp102_reg[sda->index],
135 tmp102_mC_to_reg(val));
136 mutex_unlock(&tmp102->lock);
137 return status ? : count;
138}
139
140static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp102_show_temp, NULL , 0);
141
142static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, tmp102_show_temp,
143 tmp102_set_temp, 1);
144
145static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp102_show_temp,
146 tmp102_set_temp, 2);
147
148static struct attribute *tmp102_attributes[] = {
149 &sensor_dev_attr_temp1_input.dev_attr.attr,
150 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
151 &sensor_dev_attr_temp1_max.dev_attr.attr,
152 NULL
153};
154
155static const struct attribute_group tmp102_attr_group = {
156 .attrs = tmp102_attributes,
157};
158
159#define TMP102_CONFIG (TMP102_CONF_TM | TMP102_CONF_EM | TMP102_CONF_CR1)
160#define TMP102_CONFIG_RD_ONLY (TMP102_CONF_R0 | TMP102_CONF_R1 | TMP102_CONF_AL)
161
162static int tmp102_probe(struct i2c_client *client,
163 const struct i2c_device_id *id)
164{
165 struct tmp102 *tmp102;
166 int status;
167
168 if (!i2c_check_functionality(client->adapter,
169 I2C_FUNC_SMBUS_WORD_DATA)) {
170 dev_err(&client->dev,
171 "adapter doesn't support SMBus word transactions\n");
172 return -ENODEV;
173 }
174
175 tmp102 = devm_kzalloc(&client->dev, sizeof(*tmp102), GFP_KERNEL);
176 if (!tmp102)
177 return -ENOMEM;
178
179 i2c_set_clientdata(client, tmp102);
180
181 status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
182 if (status < 0) {
183 dev_err(&client->dev, "error reading config register\n");
184 return status;
185 }
186 tmp102->config_orig = status;
187 status = i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
188 TMP102_CONFIG);
189 if (status < 0) {
190 dev_err(&client->dev, "error writing config register\n");
191 goto fail_restore_config;
192 }
193 status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
194 if (status < 0) {
195 dev_err(&client->dev, "error reading config register\n");
196 goto fail_restore_config;
197 }
198 status &= ~TMP102_CONFIG_RD_ONLY;
199 if (status != TMP102_CONFIG) {
200 dev_err(&client->dev, "config settings did not stick\n");
201 status = -ENODEV;
202 goto fail_restore_config;
203 }
204 tmp102->last_update = jiffies - HZ;
205 mutex_init(&tmp102->lock);
206
207 status = sysfs_create_group(&client->dev.kobj, &tmp102_attr_group);
208 if (status) {
209 dev_dbg(&client->dev, "could not create sysfs files\n");
210 goto fail_restore_config;
211 }
212 tmp102->hwmon_dev = hwmon_device_register(&client->dev);
213 if (IS_ERR(tmp102->hwmon_dev)) {
214 dev_dbg(&client->dev, "unable to register hwmon device\n");
215 status = PTR_ERR(tmp102->hwmon_dev);
216 goto fail_remove_sysfs;
217 }
218
219 tmp102->tz = thermal_zone_of_sensor_register(&client->dev, 0,
220 &client->dev,
221 tmp102_read_temp, NULL);
222 if (IS_ERR(tmp102->tz))
223 tmp102->tz = NULL;
224
225 dev_info(&client->dev, "initialized\n");
226
227 return 0;
228
229fail_remove_sysfs:
230 sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group);
231fail_restore_config:
232 i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
233 tmp102->config_orig);
234 return status;
235}
236
237static int tmp102_remove(struct i2c_client *client)
238{
239 struct tmp102 *tmp102 = i2c_get_clientdata(client);
240
241 thermal_zone_of_sensor_unregister(&client->dev, tmp102->tz);
242 hwmon_device_unregister(tmp102->hwmon_dev);
243 sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group);
244
245 /* Stop monitoring if device was stopped originally */
246 if (tmp102->config_orig & TMP102_CONF_SD) {
247 int config;
248
249 config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
250 if (config >= 0)
251 i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
252 config | TMP102_CONF_SD);
253 }
254
255 return 0;
256}
257
258#ifdef CONFIG_PM
259static int tmp102_suspend(struct device *dev)
260{
261 struct i2c_client *client = to_i2c_client(dev);
262 int config;
263
264 config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
265 if (config < 0)
266 return config;
267
268 config |= TMP102_CONF_SD;
269 return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config);
270}
271
272static int tmp102_resume(struct device *dev)
273{
274 struct i2c_client *client = to_i2c_client(dev);
275 int config;
276
277 config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
278 if (config < 0)
279 return config;
280
281 config &= ~TMP102_CONF_SD;
282 return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config);
283}
284
285static const struct dev_pm_ops tmp102_dev_pm_ops = {
286 .suspend = tmp102_suspend,
287 .resume = tmp102_resume,
288};
289
290#define TMP102_DEV_PM_OPS (&tmp102_dev_pm_ops)
291#else
292#define TMP102_DEV_PM_OPS NULL
293#endif /* CONFIG_PM */
294
295static const struct i2c_device_id tmp102_id[] = {
296 { "tmp102", 0 },
297 { }
298};
299MODULE_DEVICE_TABLE(i2c, tmp102_id);
300
301static struct i2c_driver tmp102_driver = {
302 .driver.name = DRIVER_NAME,
303 .driver.pm = TMP102_DEV_PM_OPS,
304 .probe = tmp102_probe,
305 .remove = tmp102_remove,
306 .id_table = tmp102_id,
307};
308
309module_i2c_driver(tmp102_driver);
310
311MODULE_AUTHOR("Steven King <sfking@fdwdc.com>");
312MODULE_DESCRIPTION("Texas Instruments TMP102 temperature sensor driver");
313MODULE_LICENSE("GPL");