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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 { | |
ad9beea4 | 54 | struct i2c_client *client; |
beb1b6bb | 55 | struct device *hwmon_dev; |
6a027523 | 56 | struct thermal_zone_device *tz; |
beb1b6bb | 57 | struct mutex lock; |
38806bda | 58 | u16 config_orig; |
beb1b6bb SK |
59 | unsigned long last_update; |
60 | int temp[3]; | |
61 | }; | |
62 | ||
cff37c9e JD |
63 | /* convert left adjusted 13-bit TMP102 register value to milliCelsius */ |
64 | static inline int tmp102_reg_to_mC(s16 val) | |
beb1b6bb | 65 | { |
cff37c9e | 66 | return ((val & ~0x01) * 1000) / 128; |
beb1b6bb SK |
67 | } |
68 | ||
cff37c9e JD |
69 | /* convert milliCelsius to left adjusted 13-bit TMP102 register value */ |
70 | static inline u16 tmp102_mC_to_reg(int val) | |
beb1b6bb SK |
71 | { |
72 | return (val * 128) / 1000; | |
73 | } | |
74 | ||
75 | static const u8 tmp102_reg[] = { | |
76 | TMP102_TEMP_REG, | |
77 | TMP102_TLOW_REG, | |
78 | TMP102_THIGH_REG, | |
79 | }; | |
80 | ||
ad9beea4 | 81 | static struct tmp102 *tmp102_update_device(struct device *dev) |
beb1b6bb | 82 | { |
ad9beea4 GR |
83 | struct tmp102 *tmp102 = dev_get_drvdata(dev); |
84 | struct i2c_client *client = tmp102->client; | |
beb1b6bb SK |
85 | |
86 | mutex_lock(&tmp102->lock); | |
cff37c9e | 87 | if (time_after(jiffies, tmp102->last_update + HZ / 3)) { |
beb1b6bb SK |
88 | int i; |
89 | for (i = 0; i < ARRAY_SIZE(tmp102->temp); ++i) { | |
90f4102c JD |
90 | int status = i2c_smbus_read_word_swapped(client, |
91 | tmp102_reg[i]); | |
beb1b6bb SK |
92 | 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 | ||
17e8351a | 101 | static int tmp102_read_temp(void *dev, int *temp) |
6a027523 | 102 | { |
ad9beea4 | 103 | struct tmp102 *tmp102 = tmp102_update_device(dev); |
6a027523 EV |
104 | |
105 | *temp = tmp102->temp[0]; | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
beb1b6bb SK |
110 | static 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); | |
ad9beea4 | 115 | struct tmp102 *tmp102 = tmp102_update_device(dev); |
beb1b6bb SK |
116 | |
117 | return sprintf(buf, "%d\n", tmp102->temp[sda->index]); | |
118 | } | |
119 | ||
120 | static 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); | |
ad9beea4 GR |
125 | struct tmp102 *tmp102 = dev_get_drvdata(dev); |
126 | struct i2c_client *client = tmp102->client; | |
beb1b6bb | 127 | long val; |
cff37c9e | 128 | int status; |
beb1b6bb | 129 | |
179c4fdb | 130 | if (kstrtol(buf, 10, &val) < 0) |
beb1b6bb | 131 | return -EINVAL; |
2a844c14 | 132 | val = clamp_val(val, -256000, 255000); |
cff37c9e | 133 | |
beb1b6bb | 134 | mutex_lock(&tmp102->lock); |
cff37c9e | 135 | tmp102->temp[sda->index] = val; |
90f4102c JD |
136 | status = i2c_smbus_write_word_swapped(client, tmp102_reg[sda->index], |
137 | tmp102_mC_to_reg(val)); | |
beb1b6bb SK |
138 | mutex_unlock(&tmp102->lock); |
139 | return status ? : count; | |
140 | } | |
141 | ||
142 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp102_show_temp, NULL , 0); | |
143 | ||
144 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, tmp102_show_temp, | |
145 | tmp102_set_temp, 1); | |
146 | ||
147 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp102_show_temp, | |
148 | tmp102_set_temp, 2); | |
149 | ||
ad9beea4 | 150 | static struct attribute *tmp102_attrs[] = { |
beb1b6bb SK |
151 | &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 | }; | |
ad9beea4 | 156 | ATTRIBUTE_GROUPS(tmp102); |
beb1b6bb SK |
157 | |
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 | ||
2251aef6 EV |
161 | static const struct thermal_zone_of_device_ops tmp102_of_thermal_ops = { |
162 | .get_temp = tmp102_read_temp, | |
163 | }; | |
164 | ||
6c931ae1 | 165 | static int tmp102_probe(struct i2c_client *client, |
beb1b6bb SK |
166 | const struct i2c_device_id *id) |
167 | { | |
fbd9af16 | 168 | struct device *dev = &client->dev; |
ad9beea4 | 169 | struct device *hwmon_dev; |
beb1b6bb SK |
170 | struct tmp102 *tmp102; |
171 | int status; | |
172 | ||
cff37c9e | 173 | if (!i2c_check_functionality(client->adapter, |
beb1b6bb | 174 | I2C_FUNC_SMBUS_WORD_DATA)) { |
fbd9af16 | 175 | dev_err(dev, |
b55f3757 | 176 | "adapter doesn't support SMBus word transactions\n"); |
beb1b6bb SK |
177 | return -ENODEV; |
178 | } | |
179 | ||
fbd9af16 | 180 | tmp102 = devm_kzalloc(dev, sizeof(*tmp102), GFP_KERNEL); |
f511a21f | 181 | if (!tmp102) |
beb1b6bb | 182 | return -ENOMEM; |
f511a21f | 183 | |
beb1b6bb | 184 | i2c_set_clientdata(client, tmp102); |
ad9beea4 | 185 | tmp102->client = client; |
beb1b6bb | 186 | |
90f4102c | 187 | status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
38806bda | 188 | if (status < 0) { |
fbd9af16 | 189 | dev_err(dev, "error reading config register\n"); |
f511a21f | 190 | return status; |
38806bda JD |
191 | } |
192 | tmp102->config_orig = status; | |
90f4102c JD |
193 | status = i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, |
194 | TMP102_CONFIG); | |
cff37c9e | 195 | if (status < 0) { |
fbd9af16 | 196 | dev_err(dev, "error writing config register\n"); |
38806bda | 197 | goto fail_restore_config; |
cff37c9e | 198 | } |
90f4102c | 199 | status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
beb1b6bb | 200 | if (status < 0) { |
fbd9af16 | 201 | dev_err(dev, "error reading config register\n"); |
38806bda | 202 | goto fail_restore_config; |
beb1b6bb SK |
203 | } |
204 | status &= ~TMP102_CONFIG_RD_ONLY; | |
205 | if (status != TMP102_CONFIG) { | |
fbd9af16 | 206 | dev_err(dev, "config settings did not stick\n"); |
cff37c9e | 207 | status = -ENODEV; |
38806bda | 208 | goto fail_restore_config; |
beb1b6bb SK |
209 | } |
210 | tmp102->last_update = jiffies - HZ; | |
211 | mutex_init(&tmp102->lock); | |
212 | ||
ad9beea4 GR |
213 | hwmon_dev = hwmon_device_register_with_groups(dev, client->name, |
214 | tmp102, tmp102_groups); | |
215 | if (IS_ERR(hwmon_dev)) { | |
fbd9af16 | 216 | dev_dbg(dev, "unable to register hwmon device\n"); |
ad9beea4 GR |
217 | status = PTR_ERR(hwmon_dev); |
218 | goto fail_restore_config; | |
beb1b6bb | 219 | } |
ad9beea4 GR |
220 | tmp102->hwmon_dev = hwmon_dev; |
221 | tmp102->tz = thermal_zone_of_sensor_register(hwmon_dev, 0, hwmon_dev, | |
2251aef6 | 222 | &tmp102_of_thermal_ops); |
6a027523 EV |
223 | if (IS_ERR(tmp102->tz)) |
224 | tmp102->tz = NULL; | |
225 | ||
fbd9af16 | 226 | dev_info(dev, "initialized\n"); |
beb1b6bb SK |
227 | |
228 | return 0; | |
38806bda | 229 | |
38806bda | 230 | fail_restore_config: |
90f4102c JD |
231 | i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, |
232 | tmp102->config_orig); | |
cff37c9e | 233 | return status; |
beb1b6bb SK |
234 | } |
235 | ||
281dfd0b | 236 | static int tmp102_remove(struct i2c_client *client) |
beb1b6bb SK |
237 | { |
238 | struct tmp102 *tmp102 = i2c_get_clientdata(client); | |
239 | ||
ad9beea4 | 240 | thermal_zone_of_sensor_unregister(tmp102->hwmon_dev, tmp102->tz); |
beb1b6bb | 241 | hwmon_device_unregister(tmp102->hwmon_dev); |
38806bda JD |
242 | |
243 | /* Stop monitoring if device was stopped originally */ | |
244 | if (tmp102->config_orig & TMP102_CONF_SD) { | |
245 | int config; | |
246 | ||
90f4102c | 247 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
38806bda | 248 | if (config >= 0) |
90f4102c JD |
249 | i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, |
250 | config | TMP102_CONF_SD); | |
38806bda JD |
251 | } |
252 | ||
beb1b6bb SK |
253 | return 0; |
254 | } | |
255 | ||
dd378b1b | 256 | #ifdef CONFIG_PM_SLEEP |
beb1b6bb SK |
257 | static int tmp102_suspend(struct device *dev) |
258 | { | |
259 | struct i2c_client *client = to_i2c_client(dev); | |
8d4dee98 | 260 | int config; |
beb1b6bb | 261 | |
90f4102c | 262 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
8d4dee98 JD |
263 | if (config < 0) |
264 | return config; | |
beb1b6bb | 265 | |
8d4dee98 | 266 | config |= TMP102_CONF_SD; |
90f4102c | 267 | return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config); |
beb1b6bb SK |
268 | } |
269 | ||
270 | static int tmp102_resume(struct device *dev) | |
271 | { | |
272 | struct i2c_client *client = to_i2c_client(dev); | |
8d4dee98 | 273 | int config; |
beb1b6bb | 274 | |
90f4102c | 275 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
8d4dee98 JD |
276 | if (config < 0) |
277 | return config; | |
beb1b6bb | 278 | |
8d4dee98 | 279 | config &= ~TMP102_CONF_SD; |
90f4102c | 280 | return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config); |
beb1b6bb | 281 | } |
beb1b6bb SK |
282 | #endif /* CONFIG_PM */ |
283 | ||
dd378b1b GS |
284 | static SIMPLE_DEV_PM_OPS(tmp102_dev_pm_ops, tmp102_suspend, tmp102_resume); |
285 | ||
beb1b6bb | 286 | static const struct i2c_device_id tmp102_id[] = { |
cff37c9e | 287 | { "tmp102", 0 }, |
beb1b6bb SK |
288 | { } |
289 | }; | |
cff37c9e | 290 | MODULE_DEVICE_TABLE(i2c, tmp102_id); |
beb1b6bb SK |
291 | |
292 | static struct i2c_driver tmp102_driver = { | |
293 | .driver.name = DRIVER_NAME, | |
dd378b1b | 294 | .driver.pm = &tmp102_dev_pm_ops, |
beb1b6bb | 295 | .probe = tmp102_probe, |
9e5e9b7a | 296 | .remove = tmp102_remove, |
beb1b6bb | 297 | .id_table = tmp102_id, |
beb1b6bb SK |
298 | }; |
299 | ||
f0967eea | 300 | module_i2c_driver(tmp102_driver); |
beb1b6bb | 301 | |
beb1b6bb SK |
302 | MODULE_AUTHOR("Steven King <sfking@fdwdc.com>"); |
303 | MODULE_DESCRIPTION("Texas Instruments TMP102 temperature sensor driver"); | |
304 | MODULE_LICENSE("GPL"); |