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. | |
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> |
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 | ||
50 | struct tmp102 { | |
51 | struct device *hwmon_dev; | |
52 | struct mutex lock; | |
38806bda | 53 | u16 config_orig; |
beb1b6bb SK |
54 | unsigned long last_update; |
55 | int temp[3]; | |
56 | }; | |
57 | ||
cff37c9e JD |
58 | /* convert left adjusted 13-bit TMP102 register value to milliCelsius */ |
59 | static inline int tmp102_reg_to_mC(s16 val) | |
beb1b6bb | 60 | { |
cff37c9e | 61 | return ((val & ~0x01) * 1000) / 128; |
beb1b6bb SK |
62 | } |
63 | ||
cff37c9e JD |
64 | /* convert milliCelsius to left adjusted 13-bit TMP102 register value */ |
65 | static inline u16 tmp102_mC_to_reg(int val) | |
beb1b6bb SK |
66 | { |
67 | return (val * 128) / 1000; | |
68 | } | |
69 | ||
70 | static const u8 tmp102_reg[] = { | |
71 | TMP102_TEMP_REG, | |
72 | TMP102_TLOW_REG, | |
73 | TMP102_THIGH_REG, | |
74 | }; | |
75 | ||
76 | static struct tmp102 *tmp102_update_device(struct i2c_client *client) | |
77 | { | |
78 | struct tmp102 *tmp102 = i2c_get_clientdata(client); | |
79 | ||
80 | mutex_lock(&tmp102->lock); | |
cff37c9e | 81 | if (time_after(jiffies, tmp102->last_update + HZ / 3)) { |
beb1b6bb SK |
82 | int i; |
83 | for (i = 0; i < ARRAY_SIZE(tmp102->temp); ++i) { | |
90f4102c JD |
84 | int status = i2c_smbus_read_word_swapped(client, |
85 | tmp102_reg[i]); | |
beb1b6bb SK |
86 | if (status > -1) |
87 | tmp102->temp[i] = tmp102_reg_to_mC(status); | |
88 | } | |
89 | tmp102->last_update = jiffies; | |
90 | } | |
91 | mutex_unlock(&tmp102->lock); | |
92 | return tmp102; | |
93 | } | |
94 | ||
95 | static ssize_t tmp102_show_temp(struct device *dev, | |
96 | struct device_attribute *attr, | |
97 | char *buf) | |
98 | { | |
99 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | |
100 | struct tmp102 *tmp102 = tmp102_update_device(to_i2c_client(dev)); | |
101 | ||
102 | return sprintf(buf, "%d\n", tmp102->temp[sda->index]); | |
103 | } | |
104 | ||
105 | static ssize_t tmp102_set_temp(struct device *dev, | |
106 | struct device_attribute *attr, | |
107 | const char *buf, size_t count) | |
108 | { | |
109 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | |
110 | struct i2c_client *client = to_i2c_client(dev); | |
111 | struct tmp102 *tmp102 = i2c_get_clientdata(client); | |
112 | long val; | |
cff37c9e | 113 | int status; |
beb1b6bb | 114 | |
179c4fdb | 115 | if (kstrtol(buf, 10, &val) < 0) |
beb1b6bb | 116 | return -EINVAL; |
cff37c9e JD |
117 | val = SENSORS_LIMIT(val, -256000, 255000); |
118 | ||
beb1b6bb | 119 | mutex_lock(&tmp102->lock); |
cff37c9e | 120 | tmp102->temp[sda->index] = val; |
90f4102c JD |
121 | status = i2c_smbus_write_word_swapped(client, tmp102_reg[sda->index], |
122 | tmp102_mC_to_reg(val)); | |
beb1b6bb SK |
123 | mutex_unlock(&tmp102->lock); |
124 | return status ? : count; | |
125 | } | |
126 | ||
127 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp102_show_temp, NULL , 0); | |
128 | ||
129 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, tmp102_show_temp, | |
130 | tmp102_set_temp, 1); | |
131 | ||
132 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp102_show_temp, | |
133 | tmp102_set_temp, 2); | |
134 | ||
135 | static struct attribute *tmp102_attributes[] = { | |
136 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
137 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
138 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
139 | NULL | |
140 | }; | |
141 | ||
142 | static const struct attribute_group tmp102_attr_group = { | |
143 | .attrs = tmp102_attributes, | |
144 | }; | |
145 | ||
146 | #define TMP102_CONFIG (TMP102_CONF_TM | TMP102_CONF_EM | TMP102_CONF_CR1) | |
147 | #define TMP102_CONFIG_RD_ONLY (TMP102_CONF_R0 | TMP102_CONF_R1 | TMP102_CONF_AL) | |
148 | ||
149 | static int __devinit tmp102_probe(struct i2c_client *client, | |
150 | const struct i2c_device_id *id) | |
151 | { | |
152 | struct tmp102 *tmp102; | |
153 | int status; | |
154 | ||
cff37c9e | 155 | if (!i2c_check_functionality(client->adapter, |
beb1b6bb | 156 | I2C_FUNC_SMBUS_WORD_DATA)) { |
25985edc | 157 | dev_err(&client->dev, "adapter doesn't support SMBus word " |
cff37c9e | 158 | "transactions\n"); |
beb1b6bb SK |
159 | return -ENODEV; |
160 | } | |
161 | ||
f511a21f GR |
162 | tmp102 = devm_kzalloc(&client->dev, sizeof(*tmp102), GFP_KERNEL); |
163 | if (!tmp102) | |
beb1b6bb | 164 | return -ENOMEM; |
f511a21f | 165 | |
beb1b6bb SK |
166 | i2c_set_clientdata(client, tmp102); |
167 | ||
90f4102c | 168 | status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
38806bda JD |
169 | if (status < 0) { |
170 | dev_err(&client->dev, "error reading config register\n"); | |
f511a21f | 171 | return status; |
38806bda JD |
172 | } |
173 | tmp102->config_orig = status; | |
90f4102c JD |
174 | status = i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, |
175 | TMP102_CONFIG); | |
cff37c9e JD |
176 | if (status < 0) { |
177 | dev_err(&client->dev, "error writing config register\n"); | |
38806bda | 178 | goto fail_restore_config; |
cff37c9e | 179 | } |
90f4102c | 180 | status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
beb1b6bb | 181 | if (status < 0) { |
cff37c9e | 182 | dev_err(&client->dev, "error reading config register\n"); |
38806bda | 183 | goto fail_restore_config; |
beb1b6bb SK |
184 | } |
185 | status &= ~TMP102_CONFIG_RD_ONLY; | |
186 | if (status != TMP102_CONFIG) { | |
cff37c9e JD |
187 | dev_err(&client->dev, "config settings did not stick\n"); |
188 | status = -ENODEV; | |
38806bda | 189 | goto fail_restore_config; |
beb1b6bb SK |
190 | } |
191 | tmp102->last_update = jiffies - HZ; | |
192 | mutex_init(&tmp102->lock); | |
193 | ||
194 | status = sysfs_create_group(&client->dev.kobj, &tmp102_attr_group); | |
195 | if (status) { | |
196 | dev_dbg(&client->dev, "could not create sysfs files\n"); | |
38806bda | 197 | goto fail_restore_config; |
beb1b6bb SK |
198 | } |
199 | tmp102->hwmon_dev = hwmon_device_register(&client->dev); | |
200 | if (IS_ERR(tmp102->hwmon_dev)) { | |
201 | dev_dbg(&client->dev, "unable to register hwmon device\n"); | |
202 | status = PTR_ERR(tmp102->hwmon_dev); | |
38806bda | 203 | goto fail_remove_sysfs; |
beb1b6bb SK |
204 | } |
205 | ||
206 | dev_info(&client->dev, "initialized\n"); | |
207 | ||
208 | return 0; | |
38806bda JD |
209 | |
210 | fail_remove_sysfs: | |
beb1b6bb | 211 | sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group); |
38806bda | 212 | fail_restore_config: |
90f4102c JD |
213 | i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, |
214 | tmp102->config_orig); | |
cff37c9e | 215 | return status; |
beb1b6bb SK |
216 | } |
217 | ||
218 | static int __devexit tmp102_remove(struct i2c_client *client) | |
219 | { | |
220 | struct tmp102 *tmp102 = i2c_get_clientdata(client); | |
221 | ||
beb1b6bb SK |
222 | hwmon_device_unregister(tmp102->hwmon_dev); |
223 | sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group); | |
38806bda JD |
224 | |
225 | /* Stop monitoring if device was stopped originally */ | |
226 | if (tmp102->config_orig & TMP102_CONF_SD) { | |
227 | int config; | |
228 | ||
90f4102c | 229 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
38806bda | 230 | if (config >= 0) |
90f4102c JD |
231 | i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, |
232 | config | TMP102_CONF_SD); | |
38806bda JD |
233 | } |
234 | ||
beb1b6bb SK |
235 | return 0; |
236 | } | |
237 | ||
238 | #ifdef CONFIG_PM | |
239 | static int tmp102_suspend(struct device *dev) | |
240 | { | |
241 | struct i2c_client *client = to_i2c_client(dev); | |
8d4dee98 | 242 | int config; |
beb1b6bb | 243 | |
90f4102c | 244 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
8d4dee98 JD |
245 | if (config < 0) |
246 | return config; | |
beb1b6bb | 247 | |
8d4dee98 | 248 | config |= TMP102_CONF_SD; |
90f4102c | 249 | return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config); |
beb1b6bb SK |
250 | } |
251 | ||
252 | static int tmp102_resume(struct device *dev) | |
253 | { | |
254 | struct i2c_client *client = to_i2c_client(dev); | |
8d4dee98 | 255 | int config; |
beb1b6bb | 256 | |
90f4102c | 257 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
8d4dee98 JD |
258 | if (config < 0) |
259 | return config; | |
beb1b6bb | 260 | |
8d4dee98 | 261 | config &= ~TMP102_CONF_SD; |
90f4102c | 262 | return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config); |
beb1b6bb SK |
263 | } |
264 | ||
265 | static const struct dev_pm_ops tmp102_dev_pm_ops = { | |
266 | .suspend = tmp102_suspend, | |
267 | .resume = tmp102_resume, | |
268 | }; | |
269 | ||
270 | #define TMP102_DEV_PM_OPS (&tmp102_dev_pm_ops) | |
271 | #else | |
272 | #define TMP102_DEV_PM_OPS NULL | |
273 | #endif /* CONFIG_PM */ | |
274 | ||
beb1b6bb | 275 | static const struct i2c_device_id tmp102_id[] = { |
cff37c9e | 276 | { "tmp102", 0 }, |
beb1b6bb SK |
277 | { } |
278 | }; | |
cff37c9e | 279 | MODULE_DEVICE_TABLE(i2c, tmp102_id); |
beb1b6bb SK |
280 | |
281 | static struct i2c_driver tmp102_driver = { | |
282 | .driver.name = DRIVER_NAME, | |
283 | .driver.pm = TMP102_DEV_PM_OPS, | |
beb1b6bb SK |
284 | .probe = tmp102_probe, |
285 | .remove = __devexit_p(tmp102_remove), | |
286 | .id_table = tmp102_id, | |
beb1b6bb SK |
287 | }; |
288 | ||
f0967eea | 289 | module_i2c_driver(tmp102_driver); |
beb1b6bb | 290 | |
beb1b6bb SK |
291 | MODULE_AUTHOR("Steven King <sfking@fdwdc.com>"); |
292 | MODULE_DESCRIPTION("Texas Instruments TMP102 temperature sensor driver"); | |
293 | MODULE_LICENSE("GPL"); |