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> |
28a340db | 27 | #include <linux/regmap.h> |
6a027523 EV |
28 | #include <linux/thermal.h> |
29 | #include <linux/of.h> | |
beb1b6bb SK |
30 | |
31 | #define DRIVER_NAME "tmp102" | |
32 | ||
33 | #define TMP102_TEMP_REG 0x00 | |
34 | #define TMP102_CONF_REG 0x01 | |
35 | /* note: these bit definitions are byte swapped */ | |
36 | #define TMP102_CONF_SD 0x0100 | |
37 | #define TMP102_CONF_TM 0x0200 | |
38 | #define TMP102_CONF_POL 0x0400 | |
39 | #define TMP102_CONF_F0 0x0800 | |
40 | #define TMP102_CONF_F1 0x1000 | |
41 | #define TMP102_CONF_R0 0x2000 | |
42 | #define TMP102_CONF_R1 0x4000 | |
43 | #define TMP102_CONF_OS 0x8000 | |
44 | #define TMP102_CONF_EM 0x0010 | |
45 | #define TMP102_CONF_AL 0x0020 | |
46 | #define TMP102_CONF_CR0 0x0040 | |
47 | #define TMP102_CONF_CR1 0x0080 | |
48 | #define TMP102_TLOW_REG 0x02 | |
49 | #define TMP102_THIGH_REG 0x03 | |
50 | ||
a9f92ccf GR |
51 | #define TMP102_CONFREG_MASK (TMP102_CONF_SD | TMP102_CONF_TM | \ |
52 | TMP102_CONF_POL | TMP102_CONF_F0 | \ | |
53 | TMP102_CONF_F1 | TMP102_CONF_OS | \ | |
54 | TMP102_CONF_EM | TMP102_CONF_AL | \ | |
55 | TMP102_CONF_CR0 | TMP102_CONF_CR1) | |
56 | ||
57 | #define TMP102_CONFIG_CLEAR (TMP102_CONF_SD | TMP102_CONF_OS | \ | |
58 | TMP102_CONF_CR0) | |
59 | #define TMP102_CONFIG_SET (TMP102_CONF_TM | TMP102_CONF_EM | \ | |
60 | TMP102_CONF_CR1) | |
61 | ||
3d8f7a89 GR |
62 | #define CONVERSION_TIME_MS 35 /* in milli-seconds */ |
63 | ||
beb1b6bb | 64 | struct tmp102 { |
28a340db | 65 | struct regmap *regmap; |
38806bda | 66 | u16 config_orig; |
3d8f7a89 | 67 | unsigned long ready_time; |
beb1b6bb SK |
68 | }; |
69 | ||
cff37c9e JD |
70 | /* convert left adjusted 13-bit TMP102 register value to milliCelsius */ |
71 | static inline int tmp102_reg_to_mC(s16 val) | |
beb1b6bb | 72 | { |
cff37c9e | 73 | return ((val & ~0x01) * 1000) / 128; |
beb1b6bb SK |
74 | } |
75 | ||
cff37c9e JD |
76 | /* convert milliCelsius to left adjusted 13-bit TMP102 register value */ |
77 | static inline u16 tmp102_mC_to_reg(int val) | |
beb1b6bb SK |
78 | { |
79 | return (val * 128) / 1000; | |
80 | } | |
81 | ||
17e8351a | 82 | static int tmp102_read_temp(void *dev, int *temp) |
6a027523 | 83 | { |
3d8f7a89 | 84 | struct tmp102 *tmp102 = dev_get_drvdata(dev); |
28a340db GR |
85 | unsigned int reg; |
86 | int ret; | |
6a027523 | 87 | |
3d8f7a89 | 88 | if (time_before(jiffies, tmp102->ready_time)) { |
00917b5c NM |
89 | dev_dbg(dev, "%s: Conversion not ready yet..\n", __func__); |
90 | return -EAGAIN; | |
91 | } | |
92 | ||
28a340db GR |
93 | ret = regmap_read(tmp102->regmap, TMP102_TEMP_REG, ®); |
94 | if (ret < 0) | |
95 | return ret; | |
3d8f7a89 | 96 | |
28a340db | 97 | *temp = tmp102_reg_to_mC(reg); |
6a027523 EV |
98 | |
99 | return 0; | |
100 | } | |
101 | ||
beb1b6bb SK |
102 | static ssize_t tmp102_show_temp(struct device *dev, |
103 | struct device_attribute *attr, | |
104 | char *buf) | |
105 | { | |
106 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | |
3d8f7a89 | 107 | struct tmp102 *tmp102 = dev_get_drvdata(dev); |
28a340db GR |
108 | int regaddr = sda->index; |
109 | unsigned int reg; | |
110 | int err; | |
beb1b6bb | 111 | |
28a340db GR |
112 | if (regaddr == TMP102_TEMP_REG && |
113 | time_before(jiffies, tmp102->ready_time)) | |
00917b5c NM |
114 | return -EAGAIN; |
115 | ||
28a340db GR |
116 | err = regmap_read(tmp102->regmap, regaddr, ®); |
117 | if (err < 0) | |
118 | return err; | |
3d8f7a89 | 119 | |
28a340db | 120 | return sprintf(buf, "%d\n", tmp102_reg_to_mC(reg)); |
beb1b6bb SK |
121 | } |
122 | ||
123 | static ssize_t tmp102_set_temp(struct device *dev, | |
124 | struct device_attribute *attr, | |
125 | const char *buf, size_t count) | |
126 | { | |
127 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | |
ad9beea4 | 128 | struct tmp102 *tmp102 = dev_get_drvdata(dev); |
28a340db | 129 | int reg = sda->index; |
beb1b6bb | 130 | long val; |
28a340db | 131 | int err; |
beb1b6bb | 132 | |
179c4fdb | 133 | if (kstrtol(buf, 10, &val) < 0) |
beb1b6bb | 134 | return -EINVAL; |
2a844c14 | 135 | val = clamp_val(val, -256000, 255000); |
cff37c9e | 136 | |
28a340db GR |
137 | err = regmap_write(tmp102->regmap, reg, tmp102_mC_to_reg(val)); |
138 | return err ? : count; | |
beb1b6bb SK |
139 | } |
140 | ||
28a340db GR |
141 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp102_show_temp, NULL, |
142 | TMP102_TEMP_REG); | |
beb1b6bb SK |
143 | |
144 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, tmp102_show_temp, | |
28a340db | 145 | tmp102_set_temp, TMP102_TLOW_REG); |
beb1b6bb SK |
146 | |
147 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp102_show_temp, | |
28a340db | 148 | tmp102_set_temp, TMP102_THIGH_REG); |
beb1b6bb | 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 | 157 | |
2251aef6 EV |
158 | static const struct thermal_zone_of_device_ops tmp102_of_thermal_ops = { |
159 | .get_temp = tmp102_read_temp, | |
160 | }; | |
161 | ||
b17ea1ca GR |
162 | static void tmp102_restore_config(void *data) |
163 | { | |
164 | struct tmp102 *tmp102 = data; | |
b17ea1ca | 165 | |
28a340db GR |
166 | regmap_write(tmp102->regmap, TMP102_CONF_REG, tmp102->config_orig); |
167 | } | |
168 | ||
169 | static bool tmp102_is_writeable_reg(struct device *dev, unsigned int reg) | |
170 | { | |
171 | return reg != TMP102_TEMP_REG; | |
b17ea1ca GR |
172 | } |
173 | ||
28a340db GR |
174 | static bool tmp102_is_volatile_reg(struct device *dev, unsigned int reg) |
175 | { | |
176 | return reg == TMP102_TEMP_REG; | |
177 | } | |
178 | ||
179 | static const struct regmap_config tmp102_regmap_config = { | |
180 | .reg_bits = 8, | |
181 | .val_bits = 16, | |
182 | .max_register = TMP102_THIGH_REG, | |
183 | .writeable_reg = tmp102_is_writeable_reg, | |
184 | .volatile_reg = tmp102_is_volatile_reg, | |
185 | .val_format_endian = REGMAP_ENDIAN_BIG, | |
186 | .cache_type = REGCACHE_RBTREE, | |
187 | .use_single_rw = true, | |
188 | }; | |
189 | ||
6c931ae1 | 190 | static int tmp102_probe(struct i2c_client *client, |
beb1b6bb SK |
191 | const struct i2c_device_id *id) |
192 | { | |
fbd9af16 | 193 | struct device *dev = &client->dev; |
ad9beea4 | 194 | struct device *hwmon_dev; |
beb1b6bb | 195 | struct tmp102 *tmp102; |
28a340db GR |
196 | unsigned int regval; |
197 | int err; | |
beb1b6bb | 198 | |
cff37c9e | 199 | if (!i2c_check_functionality(client->adapter, |
beb1b6bb | 200 | I2C_FUNC_SMBUS_WORD_DATA)) { |
fbd9af16 | 201 | dev_err(dev, |
b55f3757 | 202 | "adapter doesn't support SMBus word transactions\n"); |
beb1b6bb SK |
203 | return -ENODEV; |
204 | } | |
205 | ||
fbd9af16 | 206 | tmp102 = devm_kzalloc(dev, sizeof(*tmp102), GFP_KERNEL); |
f511a21f | 207 | if (!tmp102) |
beb1b6bb | 208 | return -ENOMEM; |
f511a21f | 209 | |
beb1b6bb SK |
210 | i2c_set_clientdata(client, tmp102); |
211 | ||
28a340db GR |
212 | tmp102->regmap = devm_regmap_init_i2c(client, &tmp102_regmap_config); |
213 | if (IS_ERR(tmp102->regmap)) | |
214 | return PTR_ERR(tmp102->regmap); | |
215 | ||
216 | err = regmap_read(tmp102->regmap, TMP102_CONF_REG, ®val); | |
217 | if (err < 0) { | |
fbd9af16 | 218 | dev_err(dev, "error reading config register\n"); |
28a340db | 219 | return err; |
38806bda | 220 | } |
a9f92ccf | 221 | |
28a340db | 222 | if ((regval & ~TMP102_CONFREG_MASK) != |
a9f92ccf GR |
223 | (TMP102_CONF_R0 | TMP102_CONF_R1)) { |
224 | dev_err(dev, "unexpected config register value\n"); | |
225 | return -ENODEV; | |
226 | } | |
227 | ||
28a340db | 228 | tmp102->config_orig = regval; |
b17ea1ca | 229 | |
1aa4f028 GR |
230 | err = devm_add_action_or_reset(dev, tmp102_restore_config, tmp102); |
231 | if (err) | |
232 | return err; | |
b17ea1ca | 233 | |
28a340db GR |
234 | regval &= ~TMP102_CONFIG_CLEAR; |
235 | regval |= TMP102_CONFIG_SET; | |
a9f92ccf | 236 | |
28a340db GR |
237 | err = regmap_write(tmp102->regmap, TMP102_CONF_REG, regval); |
238 | if (err < 0) { | |
fbd9af16 | 239 | dev_err(dev, "error writing config register\n"); |
28a340db | 240 | return err; |
cff37c9e | 241 | } |
3d8f7a89 | 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); | |
28a340db | 271 | struct tmp102 *tmp102 = i2c_get_clientdata(client); |
beb1b6bb | 272 | |
28a340db GR |
273 | return regmap_update_bits(tmp102->regmap, TMP102_CONF_REG, |
274 | TMP102_CONF_SD, TMP102_CONF_SD); | |
beb1b6bb SK |
275 | } |
276 | ||
277 | static int tmp102_resume(struct device *dev) | |
278 | { | |
279 | struct i2c_client *client = to_i2c_client(dev); | |
3d8f7a89 | 280 | struct tmp102 *tmp102 = i2c_get_clientdata(client); |
28a340db | 281 | int err; |
beb1b6bb | 282 | |
28a340db GR |
283 | err = regmap_update_bits(tmp102->regmap, TMP102_CONF_REG, |
284 | TMP102_CONF_SD, 0); | |
beb1b6bb | 285 | |
3d8f7a89 GR |
286 | tmp102->ready_time = jiffies + msecs_to_jiffies(CONVERSION_TIME_MS); |
287 | ||
28a340db | 288 | return err; |
beb1b6bb | 289 | } |
beb1b6bb SK |
290 | #endif /* CONFIG_PM */ |
291 | ||
dd378b1b GS |
292 | static SIMPLE_DEV_PM_OPS(tmp102_dev_pm_ops, tmp102_suspend, tmp102_resume); |
293 | ||
beb1b6bb | 294 | static const struct i2c_device_id tmp102_id[] = { |
cff37c9e | 295 | { "tmp102", 0 }, |
beb1b6bb SK |
296 | { } |
297 | }; | |
cff37c9e | 298 | MODULE_DEVICE_TABLE(i2c, tmp102_id); |
beb1b6bb SK |
299 | |
300 | static struct i2c_driver tmp102_driver = { | |
301 | .driver.name = DRIVER_NAME, | |
dd378b1b | 302 | .driver.pm = &tmp102_dev_pm_ops, |
beb1b6bb | 303 | .probe = tmp102_probe, |
beb1b6bb | 304 | .id_table = tmp102_id, |
beb1b6bb SK |
305 | }; |
306 | ||
f0967eea | 307 | module_i2c_driver(tmp102_driver); |
beb1b6bb | 308 | |
beb1b6bb SK |
309 | MODULE_AUTHOR("Steven King <sfking@fdwdc.com>"); |
310 | MODULE_DESCRIPTION("Texas Instruments TMP102 temperature sensor driver"); | |
311 | MODULE_LICENSE("GPL"); |