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cff37c9e | 1 | /* Texas Instruments TMP102 SMBus temperature sensor driver |
beb1b6bb | 2 | * |
cff37c9e | 3 | * Copyright (C) 2010 Steven King <sfking@fdwdc.com> |
beb1b6bb SK |
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 | ||
beb1b6bb SK |
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> | |
cff37c9e | 28 | #include <linux/device.h> |
dcd8f392 | 29 | #include <linux/jiffies.h> |
6a027523 EV |
30 | #include <linux/thermal.h> |
31 | #include <linux/of.h> | |
beb1b6bb SK |
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 | ||
53 | struct tmp102 { | |
54 | struct device *hwmon_dev; | |
6a027523 | 55 | struct thermal_zone_device *tz; |
beb1b6bb | 56 | struct mutex lock; |
38806bda | 57 | u16 config_orig; |
beb1b6bb SK |
58 | unsigned long last_update; |
59 | int temp[3]; | |
60 | }; | |
61 | ||
cff37c9e JD |
62 | /* convert left adjusted 13-bit TMP102 register value to milliCelsius */ |
63 | static inline int tmp102_reg_to_mC(s16 val) | |
beb1b6bb | 64 | { |
cff37c9e | 65 | return ((val & ~0x01) * 1000) / 128; |
beb1b6bb SK |
66 | } |
67 | ||
cff37c9e JD |
68 | /* convert milliCelsius to left adjusted 13-bit TMP102 register value */ |
69 | static inline u16 tmp102_mC_to_reg(int val) | |
beb1b6bb SK |
70 | { |
71 | return (val * 128) / 1000; | |
72 | } | |
73 | ||
74 | static const u8 tmp102_reg[] = { | |
75 | TMP102_TEMP_REG, | |
76 | TMP102_TLOW_REG, | |
77 | TMP102_THIGH_REG, | |
78 | }; | |
79 | ||
80 | static struct tmp102 *tmp102_update_device(struct i2c_client *client) | |
81 | { | |
82 | struct tmp102 *tmp102 = i2c_get_clientdata(client); | |
83 | ||
84 | mutex_lock(&tmp102->lock); | |
cff37c9e | 85 | if (time_after(jiffies, tmp102->last_update + HZ / 3)) { |
beb1b6bb SK |
86 | int i; |
87 | for (i = 0; i < ARRAY_SIZE(tmp102->temp); ++i) { | |
90f4102c JD |
88 | int status = i2c_smbus_read_word_swapped(client, |
89 | tmp102_reg[i]); | |
beb1b6bb SK |
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 | ||
6a027523 EV |
99 | static 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 | ||
beb1b6bb SK |
108 | static 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 | ||
118 | static 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; | |
cff37c9e | 126 | int status; |
beb1b6bb | 127 | |
179c4fdb | 128 | if (kstrtol(buf, 10, &val) < 0) |
beb1b6bb | 129 | return -EINVAL; |
2a844c14 | 130 | val = clamp_val(val, -256000, 255000); |
cff37c9e | 131 | |
beb1b6bb | 132 | mutex_lock(&tmp102->lock); |
cff37c9e | 133 | tmp102->temp[sda->index] = val; |
90f4102c JD |
134 | status = i2c_smbus_write_word_swapped(client, tmp102_reg[sda->index], |
135 | tmp102_mC_to_reg(val)); | |
beb1b6bb SK |
136 | mutex_unlock(&tmp102->lock); |
137 | return status ? : count; | |
138 | } | |
139 | ||
140 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp102_show_temp, NULL , 0); | |
141 | ||
142 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, tmp102_show_temp, | |
143 | tmp102_set_temp, 1); | |
144 | ||
145 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp102_show_temp, | |
146 | tmp102_set_temp, 2); | |
147 | ||
148 | static 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 | ||
155 | static 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 | ||
6c931ae1 | 162 | static int tmp102_probe(struct i2c_client *client, |
beb1b6bb SK |
163 | const struct i2c_device_id *id) |
164 | { | |
165 | struct tmp102 *tmp102; | |
166 | int status; | |
167 | ||
cff37c9e | 168 | if (!i2c_check_functionality(client->adapter, |
beb1b6bb | 169 | I2C_FUNC_SMBUS_WORD_DATA)) { |
b55f3757 GR |
170 | dev_err(&client->dev, |
171 | "adapter doesn't support SMBus word transactions\n"); | |
beb1b6bb SK |
172 | return -ENODEV; |
173 | } | |
174 | ||
f511a21f GR |
175 | tmp102 = devm_kzalloc(&client->dev, sizeof(*tmp102), GFP_KERNEL); |
176 | if (!tmp102) | |
beb1b6bb | 177 | return -ENOMEM; |
f511a21f | 178 | |
beb1b6bb SK |
179 | i2c_set_clientdata(client, tmp102); |
180 | ||
90f4102c | 181 | status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
38806bda JD |
182 | if (status < 0) { |
183 | dev_err(&client->dev, "error reading config register\n"); | |
f511a21f | 184 | return status; |
38806bda JD |
185 | } |
186 | tmp102->config_orig = status; | |
90f4102c JD |
187 | status = i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, |
188 | TMP102_CONFIG); | |
cff37c9e JD |
189 | if (status < 0) { |
190 | dev_err(&client->dev, "error writing config register\n"); | |
38806bda | 191 | goto fail_restore_config; |
cff37c9e | 192 | } |
90f4102c | 193 | status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
beb1b6bb | 194 | if (status < 0) { |
cff37c9e | 195 | dev_err(&client->dev, "error reading config register\n"); |
38806bda | 196 | goto fail_restore_config; |
beb1b6bb SK |
197 | } |
198 | status &= ~TMP102_CONFIG_RD_ONLY; | |
199 | if (status != TMP102_CONFIG) { | |
cff37c9e JD |
200 | dev_err(&client->dev, "config settings did not stick\n"); |
201 | status = -ENODEV; | |
38806bda | 202 | goto fail_restore_config; |
beb1b6bb SK |
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"); | |
38806bda | 210 | goto fail_restore_config; |
beb1b6bb SK |
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); | |
38806bda | 216 | goto fail_remove_sysfs; |
beb1b6bb SK |
217 | } |
218 | ||
6a027523 EV |
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 | ||
beb1b6bb SK |
225 | dev_info(&client->dev, "initialized\n"); |
226 | ||
227 | return 0; | |
38806bda JD |
228 | |
229 | fail_remove_sysfs: | |
beb1b6bb | 230 | sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group); |
38806bda | 231 | fail_restore_config: |
90f4102c JD |
232 | i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, |
233 | tmp102->config_orig); | |
cff37c9e | 234 | return status; |
beb1b6bb SK |
235 | } |
236 | ||
281dfd0b | 237 | static int tmp102_remove(struct i2c_client *client) |
beb1b6bb SK |
238 | { |
239 | struct tmp102 *tmp102 = i2c_get_clientdata(client); | |
240 | ||
6a027523 | 241 | thermal_zone_of_sensor_unregister(&client->dev, tmp102->tz); |
beb1b6bb SK |
242 | hwmon_device_unregister(tmp102->hwmon_dev); |
243 | sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group); | |
38806bda JD |
244 | |
245 | /* Stop monitoring if device was stopped originally */ | |
246 | if (tmp102->config_orig & TMP102_CONF_SD) { | |
247 | int config; | |
248 | ||
90f4102c | 249 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
38806bda | 250 | if (config >= 0) |
90f4102c JD |
251 | i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, |
252 | config | TMP102_CONF_SD); | |
38806bda JD |
253 | } |
254 | ||
beb1b6bb SK |
255 | return 0; |
256 | } | |
257 | ||
258 | #ifdef CONFIG_PM | |
259 | static int tmp102_suspend(struct device *dev) | |
260 | { | |
261 | struct i2c_client *client = to_i2c_client(dev); | |
8d4dee98 | 262 | int config; |
beb1b6bb | 263 | |
90f4102c | 264 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
8d4dee98 JD |
265 | if (config < 0) |
266 | return config; | |
beb1b6bb | 267 | |
8d4dee98 | 268 | config |= TMP102_CONF_SD; |
90f4102c | 269 | return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config); |
beb1b6bb SK |
270 | } |
271 | ||
272 | static int tmp102_resume(struct device *dev) | |
273 | { | |
274 | struct i2c_client *client = to_i2c_client(dev); | |
8d4dee98 | 275 | int config; |
beb1b6bb | 276 | |
90f4102c | 277 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
8d4dee98 JD |
278 | if (config < 0) |
279 | return config; | |
beb1b6bb | 280 | |
8d4dee98 | 281 | config &= ~TMP102_CONF_SD; |
90f4102c | 282 | return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config); |
beb1b6bb SK |
283 | } |
284 | ||
285 | static 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 | ||
beb1b6bb | 295 | static const struct i2c_device_id tmp102_id[] = { |
cff37c9e | 296 | { "tmp102", 0 }, |
beb1b6bb SK |
297 | { } |
298 | }; | |
cff37c9e | 299 | MODULE_DEVICE_TABLE(i2c, tmp102_id); |
beb1b6bb SK |
300 | |
301 | static struct i2c_driver tmp102_driver = { | |
302 | .driver.name = DRIVER_NAME, | |
303 | .driver.pm = TMP102_DEV_PM_OPS, | |
beb1b6bb | 304 | .probe = tmp102_probe, |
9e5e9b7a | 305 | .remove = tmp102_remove, |
beb1b6bb | 306 | .id_table = tmp102_id, |
beb1b6bb SK |
307 | }; |
308 | ||
f0967eea | 309 | module_i2c_driver(tmp102_driver); |
beb1b6bb | 310 | |
beb1b6bb SK |
311 | MODULE_AUTHOR("Steven King <sfking@fdwdc.com>"); |
312 | MODULE_DESCRIPTION("Texas Instruments TMP102 temperature sensor driver"); | |
313 | MODULE_LICENSE("GPL"); |