]>
Commit | Line | Data |
---|---|---|
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 SK |
55 | struct device *hwmon_dev; |
56 | struct mutex lock; | |
38806bda | 57 | u16 config_orig; |
beb1b6bb SK |
58 | unsigned long last_update; |
59 | int temp[3]; | |
00917b5c | 60 | bool first_time; |
beb1b6bb SK |
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; | |
00917b5c | 96 | tmp102->first_time = false; |
beb1b6bb SK |
97 | } |
98 | mutex_unlock(&tmp102->lock); | |
99 | return tmp102; | |
100 | } | |
101 | ||
17e8351a | 102 | static int tmp102_read_temp(void *dev, int *temp) |
6a027523 | 103 | { |
ad9beea4 | 104 | struct tmp102 *tmp102 = tmp102_update_device(dev); |
6a027523 | 105 | |
00917b5c NM |
106 | /* Is it too early even to return a conversion? */ |
107 | if (tmp102->first_time) { | |
108 | dev_dbg(dev, "%s: Conversion not ready yet..\n", __func__); | |
109 | return -EAGAIN; | |
110 | } | |
111 | ||
6a027523 EV |
112 | *temp = tmp102->temp[0]; |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
beb1b6bb SK |
117 | static ssize_t tmp102_show_temp(struct device *dev, |
118 | struct device_attribute *attr, | |
119 | char *buf) | |
120 | { | |
121 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | |
ad9beea4 | 122 | struct tmp102 *tmp102 = tmp102_update_device(dev); |
beb1b6bb | 123 | |
00917b5c NM |
124 | /* Is it too early even to return a read? */ |
125 | if (tmp102->first_time) | |
126 | return -EAGAIN; | |
127 | ||
beb1b6bb SK |
128 | return sprintf(buf, "%d\n", tmp102->temp[sda->index]); |
129 | } | |
130 | ||
131 | static ssize_t tmp102_set_temp(struct device *dev, | |
132 | struct device_attribute *attr, | |
133 | const char *buf, size_t count) | |
134 | { | |
135 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | |
ad9beea4 GR |
136 | struct tmp102 *tmp102 = dev_get_drvdata(dev); |
137 | struct i2c_client *client = tmp102->client; | |
beb1b6bb | 138 | long val; |
cff37c9e | 139 | int status; |
beb1b6bb | 140 | |
179c4fdb | 141 | if (kstrtol(buf, 10, &val) < 0) |
beb1b6bb | 142 | return -EINVAL; |
2a844c14 | 143 | val = clamp_val(val, -256000, 255000); |
cff37c9e | 144 | |
beb1b6bb | 145 | mutex_lock(&tmp102->lock); |
cff37c9e | 146 | tmp102->temp[sda->index] = val; |
90f4102c JD |
147 | status = i2c_smbus_write_word_swapped(client, tmp102_reg[sda->index], |
148 | tmp102_mC_to_reg(val)); | |
beb1b6bb SK |
149 | mutex_unlock(&tmp102->lock); |
150 | return status ? : count; | |
151 | } | |
152 | ||
153 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp102_show_temp, NULL , 0); | |
154 | ||
155 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, tmp102_show_temp, | |
156 | tmp102_set_temp, 1); | |
157 | ||
158 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp102_show_temp, | |
159 | tmp102_set_temp, 2); | |
160 | ||
ad9beea4 | 161 | static struct attribute *tmp102_attrs[] = { |
beb1b6bb SK |
162 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
163 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
164 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
165 | NULL | |
166 | }; | |
ad9beea4 | 167 | ATTRIBUTE_GROUPS(tmp102); |
beb1b6bb SK |
168 | |
169 | #define TMP102_CONFIG (TMP102_CONF_TM | TMP102_CONF_EM | TMP102_CONF_CR1) | |
170 | #define TMP102_CONFIG_RD_ONLY (TMP102_CONF_R0 | TMP102_CONF_R1 | TMP102_CONF_AL) | |
171 | ||
2251aef6 EV |
172 | static const struct thermal_zone_of_device_ops tmp102_of_thermal_ops = { |
173 | .get_temp = tmp102_read_temp, | |
174 | }; | |
175 | ||
6c931ae1 | 176 | static int tmp102_probe(struct i2c_client *client, |
beb1b6bb SK |
177 | const struct i2c_device_id *id) |
178 | { | |
fbd9af16 | 179 | struct device *dev = &client->dev; |
ad9beea4 | 180 | struct device *hwmon_dev; |
beb1b6bb SK |
181 | struct tmp102 *tmp102; |
182 | int status; | |
183 | ||
cff37c9e | 184 | if (!i2c_check_functionality(client->adapter, |
beb1b6bb | 185 | I2C_FUNC_SMBUS_WORD_DATA)) { |
fbd9af16 | 186 | dev_err(dev, |
b55f3757 | 187 | "adapter doesn't support SMBus word transactions\n"); |
beb1b6bb SK |
188 | return -ENODEV; |
189 | } | |
190 | ||
fbd9af16 | 191 | tmp102 = devm_kzalloc(dev, sizeof(*tmp102), GFP_KERNEL); |
f511a21f | 192 | if (!tmp102) |
beb1b6bb | 193 | return -ENOMEM; |
f511a21f | 194 | |
beb1b6bb | 195 | i2c_set_clientdata(client, tmp102); |
ad9beea4 | 196 | tmp102->client = client; |
beb1b6bb | 197 | |
90f4102c | 198 | status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
38806bda | 199 | if (status < 0) { |
fbd9af16 | 200 | dev_err(dev, "error reading config register\n"); |
f511a21f | 201 | return status; |
38806bda JD |
202 | } |
203 | tmp102->config_orig = status; | |
90f4102c JD |
204 | status = i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, |
205 | TMP102_CONFIG); | |
cff37c9e | 206 | if (status < 0) { |
fbd9af16 | 207 | dev_err(dev, "error writing config register\n"); |
38806bda | 208 | goto fail_restore_config; |
cff37c9e | 209 | } |
90f4102c | 210 | status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
beb1b6bb | 211 | if (status < 0) { |
fbd9af16 | 212 | dev_err(dev, "error reading config register\n"); |
38806bda | 213 | goto fail_restore_config; |
beb1b6bb SK |
214 | } |
215 | status &= ~TMP102_CONFIG_RD_ONLY; | |
216 | if (status != TMP102_CONFIG) { | |
fbd9af16 | 217 | dev_err(dev, "config settings did not stick\n"); |
cff37c9e | 218 | status = -ENODEV; |
38806bda | 219 | goto fail_restore_config; |
beb1b6bb | 220 | } |
00917b5c NM |
221 | tmp102->last_update = jiffies; |
222 | /* Mark that we are not ready with data until conversion is complete */ | |
223 | tmp102->first_time = true; | |
beb1b6bb SK |
224 | mutex_init(&tmp102->lock); |
225 | ||
ad9beea4 GR |
226 | hwmon_dev = hwmon_device_register_with_groups(dev, client->name, |
227 | tmp102, tmp102_groups); | |
228 | if (IS_ERR(hwmon_dev)) { | |
fbd9af16 | 229 | dev_dbg(dev, "unable to register hwmon device\n"); |
ad9beea4 GR |
230 | status = PTR_ERR(hwmon_dev); |
231 | goto fail_restore_config; | |
beb1b6bb | 232 | } |
ad9beea4 | 233 | tmp102->hwmon_dev = hwmon_dev; |
51b77fd7 EV |
234 | devm_thermal_zone_of_sensor_register(hwmon_dev, 0, hwmon_dev, |
235 | &tmp102_of_thermal_ops); | |
6a027523 | 236 | |
fbd9af16 | 237 | dev_info(dev, "initialized\n"); |
beb1b6bb SK |
238 | |
239 | return 0; | |
38806bda | 240 | |
38806bda | 241 | fail_restore_config: |
90f4102c JD |
242 | i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, |
243 | tmp102->config_orig); | |
cff37c9e | 244 | return status; |
beb1b6bb SK |
245 | } |
246 | ||
281dfd0b | 247 | static int tmp102_remove(struct i2c_client *client) |
beb1b6bb SK |
248 | { |
249 | struct tmp102 *tmp102 = i2c_get_clientdata(client); | |
250 | ||
beb1b6bb | 251 | hwmon_device_unregister(tmp102->hwmon_dev); |
38806bda JD |
252 | |
253 | /* Stop monitoring if device was stopped originally */ | |
254 | if (tmp102->config_orig & TMP102_CONF_SD) { | |
255 | int config; | |
256 | ||
90f4102c | 257 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
38806bda | 258 | if (config >= 0) |
90f4102c JD |
259 | i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, |
260 | config | TMP102_CONF_SD); | |
38806bda JD |
261 | } |
262 | ||
beb1b6bb SK |
263 | return 0; |
264 | } | |
265 | ||
dd378b1b | 266 | #ifdef CONFIG_PM_SLEEP |
beb1b6bb SK |
267 | static int tmp102_suspend(struct device *dev) |
268 | { | |
269 | struct i2c_client *client = to_i2c_client(dev); | |
8d4dee98 | 270 | int config; |
beb1b6bb | 271 | |
90f4102c | 272 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
8d4dee98 JD |
273 | if (config < 0) |
274 | return config; | |
beb1b6bb | 275 | |
8d4dee98 | 276 | config |= TMP102_CONF_SD; |
90f4102c | 277 | return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config); |
beb1b6bb SK |
278 | } |
279 | ||
280 | static int tmp102_resume(struct device *dev) | |
281 | { | |
282 | struct i2c_client *client = to_i2c_client(dev); | |
8d4dee98 | 283 | int config; |
beb1b6bb | 284 | |
90f4102c | 285 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
8d4dee98 JD |
286 | if (config < 0) |
287 | return config; | |
beb1b6bb | 288 | |
8d4dee98 | 289 | config &= ~TMP102_CONF_SD; |
90f4102c | 290 | return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config); |
beb1b6bb | 291 | } |
beb1b6bb SK |
292 | #endif /* CONFIG_PM */ |
293 | ||
dd378b1b GS |
294 | static SIMPLE_DEV_PM_OPS(tmp102_dev_pm_ops, tmp102_suspend, tmp102_resume); |
295 | ||
beb1b6bb | 296 | static const struct i2c_device_id tmp102_id[] = { |
cff37c9e | 297 | { "tmp102", 0 }, |
beb1b6bb SK |
298 | { } |
299 | }; | |
cff37c9e | 300 | MODULE_DEVICE_TABLE(i2c, tmp102_id); |
beb1b6bb SK |
301 | |
302 | static struct i2c_driver tmp102_driver = { | |
303 | .driver.name = DRIVER_NAME, | |
dd378b1b | 304 | .driver.pm = &tmp102_dev_pm_ops, |
beb1b6bb | 305 | .probe = tmp102_probe, |
9e5e9b7a | 306 | .remove = tmp102_remove, |
beb1b6bb | 307 | .id_table = tmp102_id, |
beb1b6bb SK |
308 | }; |
309 | ||
f0967eea | 310 | module_i2c_driver(tmp102_driver); |
beb1b6bb | 311 | |
beb1b6bb SK |
312 | MODULE_AUTHOR("Steven King <sfking@fdwdc.com>"); |
313 | MODULE_DESCRIPTION("Texas Instruments TMP102 temperature sensor driver"); | |
314 | MODULE_LICENSE("GPL"); |