Commit | Line | Data |
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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. | |
beb1b6bb SK |
14 | */ |
15 | ||
3d8f7a89 | 16 | #include <linux/delay.h> |
beb1b6bb SK |
17 | #include <linux/module.h> |
18 | #include <linux/init.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/i2c.h> | |
21 | #include <linux/hwmon.h> | |
22 | #include <linux/hwmon-sysfs.h> | |
23 | #include <linux/err.h> | |
24 | #include <linux/mutex.h> | |
cff37c9e | 25 | #include <linux/device.h> |
dcd8f392 | 26 | #include <linux/jiffies.h> |
6a027523 EV |
27 | #include <linux/thermal.h> |
28 | #include <linux/of.h> | |
beb1b6bb SK |
29 | |
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 | ||
a9f92ccf GR |
50 | #define TMP102_CONFREG_MASK (TMP102_CONF_SD | TMP102_CONF_TM | \ |
51 | TMP102_CONF_POL | TMP102_CONF_F0 | \ | |
52 | TMP102_CONF_F1 | TMP102_CONF_OS | \ | |
53 | TMP102_CONF_EM | TMP102_CONF_AL | \ | |
54 | TMP102_CONF_CR0 | TMP102_CONF_CR1) | |
55 | ||
56 | #define TMP102_CONFIG_CLEAR (TMP102_CONF_SD | TMP102_CONF_OS | \ | |
57 | TMP102_CONF_CR0) | |
58 | #define TMP102_CONFIG_SET (TMP102_CONF_TM | TMP102_CONF_EM | \ | |
59 | TMP102_CONF_CR1) | |
60 | ||
3d8f7a89 GR |
61 | #define CONVERSION_TIME_MS 35 /* in milli-seconds */ |
62 | ||
beb1b6bb | 63 | struct tmp102 { |
ad9beea4 | 64 | struct i2c_client *client; |
beb1b6bb | 65 | struct mutex lock; |
38806bda | 66 | u16 config_orig; |
beb1b6bb | 67 | unsigned long last_update; |
3d8f7a89 GR |
68 | unsigned long ready_time; |
69 | bool valid; | |
beb1b6bb SK |
70 | int temp[3]; |
71 | }; | |
72 | ||
cff37c9e JD |
73 | /* convert left adjusted 13-bit TMP102 register value to milliCelsius */ |
74 | static inline int tmp102_reg_to_mC(s16 val) | |
beb1b6bb | 75 | { |
cff37c9e | 76 | return ((val & ~0x01) * 1000) / 128; |
beb1b6bb SK |
77 | } |
78 | ||
cff37c9e JD |
79 | /* convert milliCelsius to left adjusted 13-bit TMP102 register value */ |
80 | static inline u16 tmp102_mC_to_reg(int val) | |
beb1b6bb SK |
81 | { |
82 | return (val * 128) / 1000; | |
83 | } | |
84 | ||
85 | static const u8 tmp102_reg[] = { | |
86 | TMP102_TEMP_REG, | |
87 | TMP102_TLOW_REG, | |
88 | TMP102_THIGH_REG, | |
89 | }; | |
90 | ||
3d8f7a89 | 91 | static void tmp102_update_device(struct device *dev) |
beb1b6bb | 92 | { |
ad9beea4 GR |
93 | struct tmp102 *tmp102 = dev_get_drvdata(dev); |
94 | struct i2c_client *client = tmp102->client; | |
beb1b6bb SK |
95 | |
96 | mutex_lock(&tmp102->lock); | |
3d8f7a89 GR |
97 | if (!tmp102->valid || |
98 | time_after(jiffies, tmp102->last_update + HZ / 3)) { | |
beb1b6bb SK |
99 | int i; |
100 | for (i = 0; i < ARRAY_SIZE(tmp102->temp); ++i) { | |
90f4102c JD |
101 | int status = i2c_smbus_read_word_swapped(client, |
102 | tmp102_reg[i]); | |
beb1b6bb SK |
103 | if (status > -1) |
104 | tmp102->temp[i] = tmp102_reg_to_mC(status); | |
105 | } | |
106 | tmp102->last_update = jiffies; | |
3d8f7a89 | 107 | tmp102->valid = true; |
beb1b6bb SK |
108 | } |
109 | mutex_unlock(&tmp102->lock); | |
beb1b6bb SK |
110 | } |
111 | ||
17e8351a | 112 | static int tmp102_read_temp(void *dev, int *temp) |
6a027523 | 113 | { |
3d8f7a89 | 114 | struct tmp102 *tmp102 = dev_get_drvdata(dev); |
6a027523 | 115 | |
3d8f7a89 | 116 | if (time_before(jiffies, tmp102->ready_time)) { |
00917b5c NM |
117 | dev_dbg(dev, "%s: Conversion not ready yet..\n", __func__); |
118 | return -EAGAIN; | |
119 | } | |
120 | ||
3d8f7a89 GR |
121 | tmp102_update_device(dev); |
122 | ||
6a027523 EV |
123 | *temp = tmp102->temp[0]; |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
beb1b6bb SK |
128 | static ssize_t tmp102_show_temp(struct device *dev, |
129 | struct device_attribute *attr, | |
130 | char *buf) | |
131 | { | |
132 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | |
3d8f7a89 | 133 | struct tmp102 *tmp102 = dev_get_drvdata(dev); |
beb1b6bb | 134 | |
3d8f7a89 | 135 | if (time_before(jiffies, tmp102->ready_time)) |
00917b5c NM |
136 | return -EAGAIN; |
137 | ||
3d8f7a89 GR |
138 | tmp102_update_device(dev); |
139 | ||
beb1b6bb SK |
140 | return sprintf(buf, "%d\n", tmp102->temp[sda->index]); |
141 | } | |
142 | ||
143 | static ssize_t tmp102_set_temp(struct device *dev, | |
144 | struct device_attribute *attr, | |
145 | const char *buf, size_t count) | |
146 | { | |
147 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | |
ad9beea4 GR |
148 | struct tmp102 *tmp102 = dev_get_drvdata(dev); |
149 | struct i2c_client *client = tmp102->client; | |
beb1b6bb | 150 | long val; |
cff37c9e | 151 | int status; |
beb1b6bb | 152 | |
179c4fdb | 153 | if (kstrtol(buf, 10, &val) < 0) |
beb1b6bb | 154 | return -EINVAL; |
2a844c14 | 155 | val = clamp_val(val, -256000, 255000); |
cff37c9e | 156 | |
beb1b6bb | 157 | mutex_lock(&tmp102->lock); |
cff37c9e | 158 | tmp102->temp[sda->index] = val; |
90f4102c JD |
159 | status = i2c_smbus_write_word_swapped(client, tmp102_reg[sda->index], |
160 | tmp102_mC_to_reg(val)); | |
beb1b6bb SK |
161 | mutex_unlock(&tmp102->lock); |
162 | return status ? : count; | |
163 | } | |
164 | ||
165 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp102_show_temp, NULL , 0); | |
166 | ||
167 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, tmp102_show_temp, | |
168 | tmp102_set_temp, 1); | |
169 | ||
170 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp102_show_temp, | |
171 | tmp102_set_temp, 2); | |
172 | ||
ad9beea4 | 173 | static struct attribute *tmp102_attrs[] = { |
beb1b6bb SK |
174 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
175 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
176 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
177 | NULL | |
178 | }; | |
ad9beea4 | 179 | ATTRIBUTE_GROUPS(tmp102); |
beb1b6bb | 180 | |
2251aef6 EV |
181 | static const struct thermal_zone_of_device_ops tmp102_of_thermal_ops = { |
182 | .get_temp = tmp102_read_temp, | |
183 | }; | |
184 | ||
b17ea1ca GR |
185 | static void tmp102_restore_config(void *data) |
186 | { | |
187 | struct tmp102 *tmp102 = data; | |
188 | struct i2c_client *client = tmp102->client; | |
189 | ||
190 | i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, | |
191 | tmp102->config_orig); | |
192 | } | |
193 | ||
6c931ae1 | 194 | static int tmp102_probe(struct i2c_client *client, |
beb1b6bb SK |
195 | const struct i2c_device_id *id) |
196 | { | |
fbd9af16 | 197 | struct device *dev = &client->dev; |
ad9beea4 | 198 | struct device *hwmon_dev; |
beb1b6bb SK |
199 | struct tmp102 *tmp102; |
200 | int status; | |
201 | ||
cff37c9e | 202 | if (!i2c_check_functionality(client->adapter, |
beb1b6bb | 203 | I2C_FUNC_SMBUS_WORD_DATA)) { |
fbd9af16 | 204 | dev_err(dev, |
b55f3757 | 205 | "adapter doesn't support SMBus word transactions\n"); |
beb1b6bb SK |
206 | return -ENODEV; |
207 | } | |
208 | ||
fbd9af16 | 209 | tmp102 = devm_kzalloc(dev, sizeof(*tmp102), GFP_KERNEL); |
f511a21f | 210 | if (!tmp102) |
beb1b6bb | 211 | return -ENOMEM; |
f511a21f | 212 | |
beb1b6bb | 213 | i2c_set_clientdata(client, tmp102); |
ad9beea4 | 214 | tmp102->client = client; |
beb1b6bb | 215 | |
90f4102c | 216 | status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
38806bda | 217 | if (status < 0) { |
fbd9af16 | 218 | dev_err(dev, "error reading config register\n"); |
f511a21f | 219 | return status; |
38806bda | 220 | } |
a9f92ccf GR |
221 | |
222 | if ((status & ~TMP102_CONFREG_MASK) != | |
223 | (TMP102_CONF_R0 | TMP102_CONF_R1)) { | |
224 | dev_err(dev, "unexpected config register value\n"); | |
225 | return -ENODEV; | |
226 | } | |
227 | ||
38806bda | 228 | tmp102->config_orig = status; |
b17ea1ca GR |
229 | |
230 | devm_add_action(dev, tmp102_restore_config, tmp102); | |
231 | ||
a9f92ccf GR |
232 | status &= ~TMP102_CONFIG_CLEAR; |
233 | status |= TMP102_CONFIG_SET; | |
234 | ||
235 | status = i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, status); | |
cff37c9e | 236 | if (status < 0) { |
fbd9af16 | 237 | dev_err(dev, "error writing config register\n"); |
b17ea1ca | 238 | return status; |
cff37c9e | 239 | } |
3d8f7a89 | 240 | |
beb1b6bb SK |
241 | mutex_init(&tmp102->lock); |
242 | ||
3d8f7a89 GR |
243 | tmp102->ready_time = jiffies; |
244 | if (tmp102->config_orig & TMP102_CONF_SD) { | |
245 | /* | |
246 | * Mark that we are not ready with data until the first | |
247 | * conversion is complete | |
248 | */ | |
249 | tmp102->ready_time += msecs_to_jiffies(CONVERSION_TIME_MS); | |
250 | } | |
251 | ||
b17ea1ca GR |
252 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
253 | tmp102, | |
254 | tmp102_groups); | |
ad9beea4 | 255 | if (IS_ERR(hwmon_dev)) { |
fbd9af16 | 256 | dev_dbg(dev, "unable to register hwmon device\n"); |
b17ea1ca | 257 | return PTR_ERR(hwmon_dev); |
beb1b6bb | 258 | } |
51b77fd7 EV |
259 | devm_thermal_zone_of_sensor_register(hwmon_dev, 0, hwmon_dev, |
260 | &tmp102_of_thermal_ops); | |
6a027523 | 261 | |
fbd9af16 | 262 | dev_info(dev, "initialized\n"); |
beb1b6bb | 263 | |
beb1b6bb SK |
264 | return 0; |
265 | } | |
266 | ||
dd378b1b | 267 | #ifdef CONFIG_PM_SLEEP |
beb1b6bb SK |
268 | static int tmp102_suspend(struct device *dev) |
269 | { | |
270 | struct i2c_client *client = to_i2c_client(dev); | |
8d4dee98 | 271 | int config; |
beb1b6bb | 272 | |
90f4102c | 273 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
8d4dee98 JD |
274 | if (config < 0) |
275 | return config; | |
beb1b6bb | 276 | |
8d4dee98 | 277 | config |= TMP102_CONF_SD; |
90f4102c | 278 | return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config); |
beb1b6bb SK |
279 | } |
280 | ||
281 | static int tmp102_resume(struct device *dev) | |
282 | { | |
283 | struct i2c_client *client = to_i2c_client(dev); | |
3d8f7a89 | 284 | struct tmp102 *tmp102 = i2c_get_clientdata(client); |
8d4dee98 | 285 | int config; |
beb1b6bb | 286 | |
90f4102c | 287 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
8d4dee98 JD |
288 | if (config < 0) |
289 | return config; | |
beb1b6bb | 290 | |
3d8f7a89 GR |
291 | tmp102->ready_time = jiffies + msecs_to_jiffies(CONVERSION_TIME_MS); |
292 | ||
8d4dee98 | 293 | config &= ~TMP102_CONF_SD; |
90f4102c | 294 | return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config); |
beb1b6bb | 295 | } |
beb1b6bb SK |
296 | #endif /* CONFIG_PM */ |
297 | ||
dd378b1b GS |
298 | static SIMPLE_DEV_PM_OPS(tmp102_dev_pm_ops, tmp102_suspend, tmp102_resume); |
299 | ||
beb1b6bb | 300 | static const struct i2c_device_id tmp102_id[] = { |
cff37c9e | 301 | { "tmp102", 0 }, |
beb1b6bb SK |
302 | { } |
303 | }; | |
cff37c9e | 304 | MODULE_DEVICE_TABLE(i2c, tmp102_id); |
beb1b6bb SK |
305 | |
306 | static struct i2c_driver tmp102_driver = { | |
307 | .driver.name = DRIVER_NAME, | |
dd378b1b | 308 | .driver.pm = &tmp102_dev_pm_ops, |
beb1b6bb | 309 | .probe = tmp102_probe, |
beb1b6bb | 310 | .id_table = tmp102_id, |
beb1b6bb SK |
311 | }; |
312 | ||
f0967eea | 313 | module_i2c_driver(tmp102_driver); |
beb1b6bb | 314 | |
beb1b6bb SK |
315 | MODULE_AUTHOR("Steven King <sfking@fdwdc.com>"); |
316 | MODULE_DESCRIPTION("Texas Instruments TMP102 temperature sensor driver"); | |
317 | MODULE_LICENSE("GPL"); |