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> |
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 | ||
51 | struct tmp102 { | |
52 | struct device *hwmon_dev; | |
53 | struct mutex lock; | |
38806bda | 54 | u16 config_orig; |
beb1b6bb SK |
55 | unsigned long last_update; |
56 | int temp[3]; | |
57 | }; | |
58 | ||
cff37c9e JD |
59 | /* convert left adjusted 13-bit TMP102 register value to milliCelsius */ |
60 | static inline int tmp102_reg_to_mC(s16 val) | |
beb1b6bb | 61 | { |
cff37c9e | 62 | return ((val & ~0x01) * 1000) / 128; |
beb1b6bb SK |
63 | } |
64 | ||
cff37c9e JD |
65 | /* convert milliCelsius to left adjusted 13-bit TMP102 register value */ |
66 | static inline u16 tmp102_mC_to_reg(int val) | |
beb1b6bb SK |
67 | { |
68 | return (val * 128) / 1000; | |
69 | } | |
70 | ||
71 | static const u8 tmp102_reg[] = { | |
72 | TMP102_TEMP_REG, | |
73 | TMP102_TLOW_REG, | |
74 | TMP102_THIGH_REG, | |
75 | }; | |
76 | ||
77 | static struct tmp102 *tmp102_update_device(struct i2c_client *client) | |
78 | { | |
79 | struct tmp102 *tmp102 = i2c_get_clientdata(client); | |
80 | ||
81 | mutex_lock(&tmp102->lock); | |
cff37c9e | 82 | if (time_after(jiffies, tmp102->last_update + HZ / 3)) { |
beb1b6bb SK |
83 | int i; |
84 | for (i = 0; i < ARRAY_SIZE(tmp102->temp); ++i) { | |
90f4102c JD |
85 | int status = i2c_smbus_read_word_swapped(client, |
86 | tmp102_reg[i]); | |
beb1b6bb SK |
87 | if (status > -1) |
88 | tmp102->temp[i] = tmp102_reg_to_mC(status); | |
89 | } | |
90 | tmp102->last_update = jiffies; | |
91 | } | |
92 | mutex_unlock(&tmp102->lock); | |
93 | return tmp102; | |
94 | } | |
95 | ||
96 | static ssize_t tmp102_show_temp(struct device *dev, | |
97 | struct device_attribute *attr, | |
98 | char *buf) | |
99 | { | |
100 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | |
101 | struct tmp102 *tmp102 = tmp102_update_device(to_i2c_client(dev)); | |
102 | ||
103 | return sprintf(buf, "%d\n", tmp102->temp[sda->index]); | |
104 | } | |
105 | ||
106 | static ssize_t tmp102_set_temp(struct device *dev, | |
107 | struct device_attribute *attr, | |
108 | const char *buf, size_t count) | |
109 | { | |
110 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | |
111 | struct i2c_client *client = to_i2c_client(dev); | |
112 | struct tmp102 *tmp102 = i2c_get_clientdata(client); | |
113 | long val; | |
cff37c9e | 114 | int status; |
beb1b6bb | 115 | |
179c4fdb | 116 | if (kstrtol(buf, 10, &val) < 0) |
beb1b6bb | 117 | return -EINVAL; |
2a844c14 | 118 | val = clamp_val(val, -256000, 255000); |
cff37c9e | 119 | |
beb1b6bb | 120 | mutex_lock(&tmp102->lock); |
cff37c9e | 121 | tmp102->temp[sda->index] = val; |
90f4102c JD |
122 | status = i2c_smbus_write_word_swapped(client, tmp102_reg[sda->index], |
123 | tmp102_mC_to_reg(val)); | |
beb1b6bb SK |
124 | mutex_unlock(&tmp102->lock); |
125 | return status ? : count; | |
126 | } | |
127 | ||
128 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp102_show_temp, NULL , 0); | |
129 | ||
130 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, tmp102_show_temp, | |
131 | tmp102_set_temp, 1); | |
132 | ||
133 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp102_show_temp, | |
134 | tmp102_set_temp, 2); | |
135 | ||
136 | static struct attribute *tmp102_attributes[] = { | |
137 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
138 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
139 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
140 | NULL | |
141 | }; | |
142 | ||
143 | static const struct attribute_group tmp102_attr_group = { | |
144 | .attrs = tmp102_attributes, | |
145 | }; | |
146 | ||
147 | #define TMP102_CONFIG (TMP102_CONF_TM | TMP102_CONF_EM | TMP102_CONF_CR1) | |
148 | #define TMP102_CONFIG_RD_ONLY (TMP102_CONF_R0 | TMP102_CONF_R1 | TMP102_CONF_AL) | |
149 | ||
6c931ae1 | 150 | static int tmp102_probe(struct i2c_client *client, |
beb1b6bb SK |
151 | const struct i2c_device_id *id) |
152 | { | |
153 | struct tmp102 *tmp102; | |
154 | int status; | |
155 | ||
cff37c9e | 156 | if (!i2c_check_functionality(client->adapter, |
beb1b6bb | 157 | I2C_FUNC_SMBUS_WORD_DATA)) { |
b55f3757 GR |
158 | dev_err(&client->dev, |
159 | "adapter doesn't support SMBus word transactions\n"); | |
beb1b6bb SK |
160 | return -ENODEV; |
161 | } | |
162 | ||
f511a21f GR |
163 | tmp102 = devm_kzalloc(&client->dev, sizeof(*tmp102), GFP_KERNEL); |
164 | if (!tmp102) | |
beb1b6bb | 165 | return -ENOMEM; |
f511a21f | 166 | |
beb1b6bb SK |
167 | i2c_set_clientdata(client, tmp102); |
168 | ||
90f4102c | 169 | status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
38806bda JD |
170 | if (status < 0) { |
171 | dev_err(&client->dev, "error reading config register\n"); | |
f511a21f | 172 | return status; |
38806bda JD |
173 | } |
174 | tmp102->config_orig = status; | |
90f4102c JD |
175 | status = i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, |
176 | TMP102_CONFIG); | |
cff37c9e JD |
177 | if (status < 0) { |
178 | dev_err(&client->dev, "error writing config register\n"); | |
38806bda | 179 | goto fail_restore_config; |
cff37c9e | 180 | } |
90f4102c | 181 | status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
beb1b6bb | 182 | if (status < 0) { |
cff37c9e | 183 | dev_err(&client->dev, "error reading config register\n"); |
38806bda | 184 | goto fail_restore_config; |
beb1b6bb SK |
185 | } |
186 | status &= ~TMP102_CONFIG_RD_ONLY; | |
187 | if (status != TMP102_CONFIG) { | |
cff37c9e JD |
188 | dev_err(&client->dev, "config settings did not stick\n"); |
189 | status = -ENODEV; | |
38806bda | 190 | goto fail_restore_config; |
beb1b6bb SK |
191 | } |
192 | tmp102->last_update = jiffies - HZ; | |
193 | mutex_init(&tmp102->lock); | |
194 | ||
195 | status = sysfs_create_group(&client->dev.kobj, &tmp102_attr_group); | |
196 | if (status) { | |
197 | dev_dbg(&client->dev, "could not create sysfs files\n"); | |
38806bda | 198 | goto fail_restore_config; |
beb1b6bb SK |
199 | } |
200 | tmp102->hwmon_dev = hwmon_device_register(&client->dev); | |
201 | if (IS_ERR(tmp102->hwmon_dev)) { | |
202 | dev_dbg(&client->dev, "unable to register hwmon device\n"); | |
203 | status = PTR_ERR(tmp102->hwmon_dev); | |
38806bda | 204 | goto fail_remove_sysfs; |
beb1b6bb SK |
205 | } |
206 | ||
207 | dev_info(&client->dev, "initialized\n"); | |
208 | ||
209 | return 0; | |
38806bda JD |
210 | |
211 | fail_remove_sysfs: | |
beb1b6bb | 212 | sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group); |
38806bda | 213 | fail_restore_config: |
90f4102c JD |
214 | i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, |
215 | tmp102->config_orig); | |
cff37c9e | 216 | return status; |
beb1b6bb SK |
217 | } |
218 | ||
281dfd0b | 219 | static int tmp102_remove(struct i2c_client *client) |
beb1b6bb SK |
220 | { |
221 | struct tmp102 *tmp102 = i2c_get_clientdata(client); | |
222 | ||
beb1b6bb SK |
223 | hwmon_device_unregister(tmp102->hwmon_dev); |
224 | sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group); | |
38806bda JD |
225 | |
226 | /* Stop monitoring if device was stopped originally */ | |
227 | if (tmp102->config_orig & TMP102_CONF_SD) { | |
228 | int config; | |
229 | ||
90f4102c | 230 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
38806bda | 231 | if (config >= 0) |
90f4102c JD |
232 | i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, |
233 | config | TMP102_CONF_SD); | |
38806bda JD |
234 | } |
235 | ||
beb1b6bb SK |
236 | return 0; |
237 | } | |
238 | ||
239 | #ifdef CONFIG_PM | |
240 | static int tmp102_suspend(struct device *dev) | |
241 | { | |
242 | struct i2c_client *client = to_i2c_client(dev); | |
8d4dee98 | 243 | int config; |
beb1b6bb | 244 | |
90f4102c | 245 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
8d4dee98 JD |
246 | if (config < 0) |
247 | return config; | |
beb1b6bb | 248 | |
8d4dee98 | 249 | config |= TMP102_CONF_SD; |
90f4102c | 250 | return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config); |
beb1b6bb SK |
251 | } |
252 | ||
253 | static int tmp102_resume(struct device *dev) | |
254 | { | |
255 | struct i2c_client *client = to_i2c_client(dev); | |
8d4dee98 | 256 | int config; |
beb1b6bb | 257 | |
90f4102c | 258 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
8d4dee98 JD |
259 | if (config < 0) |
260 | return config; | |
beb1b6bb | 261 | |
8d4dee98 | 262 | config &= ~TMP102_CONF_SD; |
90f4102c | 263 | return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config); |
beb1b6bb SK |
264 | } |
265 | ||
266 | static const struct dev_pm_ops tmp102_dev_pm_ops = { | |
267 | .suspend = tmp102_suspend, | |
268 | .resume = tmp102_resume, | |
269 | }; | |
270 | ||
271 | #define TMP102_DEV_PM_OPS (&tmp102_dev_pm_ops) | |
272 | #else | |
273 | #define TMP102_DEV_PM_OPS NULL | |
274 | #endif /* CONFIG_PM */ | |
275 | ||
beb1b6bb | 276 | static const struct i2c_device_id tmp102_id[] = { |
cff37c9e | 277 | { "tmp102", 0 }, |
beb1b6bb SK |
278 | { } |
279 | }; | |
cff37c9e | 280 | MODULE_DEVICE_TABLE(i2c, tmp102_id); |
beb1b6bb SK |
281 | |
282 | static struct i2c_driver tmp102_driver = { | |
283 | .driver.name = DRIVER_NAME, | |
284 | .driver.pm = TMP102_DEV_PM_OPS, | |
beb1b6bb | 285 | .probe = tmp102_probe, |
9e5e9b7a | 286 | .remove = tmp102_remove, |
beb1b6bb | 287 | .id_table = tmp102_id, |
beb1b6bb SK |
288 | }; |
289 | ||
f0967eea | 290 | module_i2c_driver(tmp102_driver); |
beb1b6bb | 291 | |
beb1b6bb SK |
292 | MODULE_AUTHOR("Steven King <sfking@fdwdc.com>"); |
293 | MODULE_DESCRIPTION("Texas Instruments TMP102 temperature sensor driver"); | |
294 | MODULE_LICENSE("GPL"); |