Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
caaa0f36 S |
2 | * lm75.c - Part of lm_sensors, Linux kernel modules for hardware |
3 | * monitoring | |
4 | * Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
1da177e4 | 20 | |
1da177e4 LT |
21 | #include <linux/module.h> |
22 | #include <linux/init.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/jiffies.h> | |
25 | #include <linux/i2c.h> | |
943b0830 | 26 | #include <linux/hwmon.h> |
9ca8e40c | 27 | #include <linux/hwmon-sysfs.h> |
943b0830 | 28 | #include <linux/err.h> |
9a61bf63 | 29 | #include <linux/mutex.h> |
1da177e4 LT |
30 | #include "lm75.h" |
31 | ||
32 | ||
01a52397 DB |
33 | /* |
34 | * This driver handles the LM75 and compatible digital temperature sensors. | |
01a52397 DB |
35 | */ |
36 | ||
9ebd3d82 | 37 | enum lm75_type { /* keep sorted in alphabetical order */ |
e96f9d89 | 38 | adt75, |
1f86df49 | 39 | ds1775, |
9ebd3d82 | 40 | ds75, |
3fbc81e3 | 41 | ds7505, |
c98d6c65 | 42 | g751, |
1f86df49 | 43 | lm75, |
9ebd3d82 DB |
44 | lm75a, |
45 | max6625, | |
46 | max6626, | |
47 | mcp980x, | |
48 | stds75, | |
49 | tcn75, | |
50 | tmp100, | |
51 | tmp101, | |
6d034059 | 52 | tmp105, |
9ebd3d82 DB |
53 | tmp175, |
54 | tmp275, | |
55 | tmp75, | |
56 | }; | |
57 | ||
8ff69eeb | 58 | /* Addresses scanned */ |
25e9c86d | 59 | static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, |
1da177e4 | 60 | 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; |
1da177e4 | 61 | |
1da177e4 LT |
62 | |
63 | /* The LM75 registers */ | |
1da177e4 | 64 | #define LM75_REG_CONF 0x01 |
9ca8e40c JD |
65 | static const u8 LM75_REG_TEMP[3] = { |
66 | 0x00, /* input */ | |
67 | 0x03, /* max */ | |
68 | 0x02, /* hyst */ | |
69 | }; | |
1da177e4 LT |
70 | |
71 | /* Each client has this additional data */ | |
72 | struct lm75_data { | |
01a52397 | 73 | struct device *hwmon_dev; |
9a61bf63 | 74 | struct mutex update_lock; |
9ebd3d82 | 75 | u8 orig_conf; |
87d0621a JD |
76 | u8 resolution; /* In bits, between 9 and 12 */ |
77 | u8 resolution_limits; | |
01a52397 | 78 | char valid; /* !=0 if registers are valid */ |
1da177e4 | 79 | unsigned long last_updated; /* In jiffies */ |
87d0621a JD |
80 | unsigned long sample_time; /* In jiffies */ |
81 | s16 temp[3]; /* Register values, | |
9ca8e40c JD |
82 | 0 = input |
83 | 1 = max | |
84 | 2 = hyst */ | |
1da177e4 LT |
85 | }; |
86 | ||
1da177e4 LT |
87 | static int lm75_read_value(struct i2c_client *client, u8 reg); |
88 | static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value); | |
89 | static struct lm75_data *lm75_update_device(struct device *dev); | |
90 | ||
91 | ||
01a52397 DB |
92 | /*-----------------------------------------------------------------------*/ |
93 | ||
94 | /* sysfs attributes for hwmon */ | |
1da177e4 | 95 | |
9ca8e40c JD |
96 | static ssize_t show_temp(struct device *dev, struct device_attribute *da, |
97 | char *buf) | |
98 | { | |
99 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
100 | struct lm75_data *data = lm75_update_device(dev); | |
87d0621a | 101 | long temp; |
1f962f36 FM |
102 | |
103 | if (IS_ERR(data)) | |
104 | return PTR_ERR(data); | |
105 | ||
87d0621a JD |
106 | temp = ((data->temp[attr->index] >> (16 - data->resolution)) * 1000) |
107 | >> (data->resolution - 8); | |
108 | ||
109 | return sprintf(buf, "%ld\n", temp); | |
1da177e4 | 110 | } |
9ca8e40c JD |
111 | |
112 | static ssize_t set_temp(struct device *dev, struct device_attribute *da, | |
113 | const char *buf, size_t count) | |
114 | { | |
115 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
116 | struct i2c_client *client = to_i2c_client(dev); | |
117 | struct lm75_data *data = i2c_get_clientdata(client); | |
118 | int nr = attr->index; | |
e3cd9528 S |
119 | long temp; |
120 | int error; | |
87d0621a | 121 | u8 resolution; |
e3cd9528 | 122 | |
24edc0a7 | 123 | error = kstrtol(buf, 10, &temp); |
e3cd9528 S |
124 | if (error) |
125 | return error; | |
9ca8e40c | 126 | |
87d0621a JD |
127 | /* |
128 | * Resolution of limit registers is assumed to be the same as the | |
129 | * temperature input register resolution unless given explicitly. | |
130 | */ | |
131 | if (attr->index && data->resolution_limits) | |
132 | resolution = data->resolution_limits; | |
133 | else | |
134 | resolution = data->resolution; | |
135 | ||
9ca8e40c | 136 | mutex_lock(&data->update_lock); |
87d0621a JD |
137 | temp = clamp_val(temp, LM75_TEMP_MIN, LM75_TEMP_MAX); |
138 | data->temp[nr] = DIV_ROUND_CLOSEST(temp << (resolution - 8), | |
139 | 1000) << (16 - resolution); | |
9ca8e40c JD |
140 | lm75_write_value(client, LM75_REG_TEMP[nr], data->temp[nr]); |
141 | mutex_unlock(&data->update_lock); | |
142 | return count; | |
1da177e4 | 143 | } |
1da177e4 | 144 | |
9ca8e40c JD |
145 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, |
146 | show_temp, set_temp, 1); | |
147 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, | |
148 | show_temp, set_temp, 2); | |
149 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); | |
1da177e4 | 150 | |
c1685f61 | 151 | static struct attribute *lm75_attributes[] = { |
9ca8e40c JD |
152 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
153 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
154 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
c1685f61 MH |
155 | |
156 | NULL | |
157 | }; | |
158 | ||
159 | static const struct attribute_group lm75_group = { | |
160 | .attrs = lm75_attributes, | |
161 | }; | |
162 | ||
01a52397 DB |
163 | /*-----------------------------------------------------------------------*/ |
164 | ||
8ff69eeb | 165 | /* device probe and removal */ |
9ebd3d82 DB |
166 | |
167 | static int | |
168 | lm75_probe(struct i2c_client *client, const struct i2c_device_id *id) | |
169 | { | |
170 | struct lm75_data *data; | |
171 | int status; | |
172 | u8 set_mask, clr_mask; | |
173 | int new; | |
0cd2c72d | 174 | enum lm75_type kind = id->driver_data; |
9ebd3d82 DB |
175 | |
176 | if (!i2c_check_functionality(client->adapter, | |
177 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) | |
178 | return -EIO; | |
179 | ||
13ac7a01 | 180 | data = devm_kzalloc(&client->dev, sizeof(struct lm75_data), GFP_KERNEL); |
9ebd3d82 DB |
181 | if (!data) |
182 | return -ENOMEM; | |
183 | ||
184 | i2c_set_clientdata(client, data); | |
9ebd3d82 DB |
185 | mutex_init(&data->update_lock); |
186 | ||
187 | /* Set to LM75 resolution (9 bits, 1/2 degree C) and range. | |
188 | * Then tweak to be more precise when appropriate. | |
189 | */ | |
190 | set_mask = 0; | |
8a5c5cc6 JD |
191 | clr_mask = LM75_SHUTDOWN; /* continuous conversions */ |
192 | ||
0cd2c72d | 193 | switch (kind) { |
8a5c5cc6 JD |
194 | case adt75: |
195 | clr_mask |= 1 << 5; /* not one-shot mode */ | |
0cd2c72d JD |
196 | data->resolution = 12; |
197 | data->sample_time = HZ / 8; | |
8a5c5cc6 JD |
198 | break; |
199 | case ds1775: | |
200 | case ds75: | |
201 | case stds75: | |
0cd2c72d JD |
202 | clr_mask |= 3 << 5; |
203 | set_mask |= 2 << 5; /* 11-bit mode */ | |
204 | data->resolution = 11; | |
205 | data->sample_time = HZ; | |
206 | break; | |
3fbc81e3 JD |
207 | case ds7505: |
208 | set_mask |= 3 << 5; /* 12-bit mode */ | |
209 | data->resolution = 12; | |
210 | data->sample_time = HZ / 4; | |
211 | break; | |
c98d6c65 | 212 | case g751: |
0cd2c72d JD |
213 | case lm75: |
214 | case lm75a: | |
215 | data->resolution = 9; | |
216 | data->sample_time = HZ / 2; | |
217 | break; | |
218 | case max6625: | |
219 | data->resolution = 9; | |
220 | data->sample_time = HZ / 4; | |
221 | break; | |
222 | case max6626: | |
223 | data->resolution = 12; | |
224 | data->resolution_limits = 9; | |
225 | data->sample_time = HZ / 4; | |
226 | break; | |
227 | case tcn75: | |
228 | data->resolution = 9; | |
229 | data->sample_time = HZ / 8; | |
8a5c5cc6 JD |
230 | break; |
231 | case mcp980x: | |
0cd2c72d JD |
232 | data->resolution_limits = 9; |
233 | /* fall through */ | |
8a5c5cc6 JD |
234 | case tmp100: |
235 | case tmp101: | |
0cd2c72d JD |
236 | set_mask |= 3 << 5; /* 12-bit mode */ |
237 | data->resolution = 12; | |
238 | data->sample_time = HZ; | |
239 | clr_mask |= 1 << 7; /* not one-shot mode */ | |
240 | break; | |
8a5c5cc6 JD |
241 | case tmp105: |
242 | case tmp175: | |
243 | case tmp275: | |
244 | case tmp75: | |
0cd2c72d | 245 | set_mask |= 3 << 5; /* 12-bit mode */ |
8a5c5cc6 | 246 | clr_mask |= 1 << 7; /* not one-shot mode */ |
0cd2c72d JD |
247 | data->resolution = 12; |
248 | data->sample_time = HZ / 2; | |
8a5c5cc6 JD |
249 | break; |
250 | } | |
9ebd3d82 DB |
251 | |
252 | /* configure as specified */ | |
253 | status = lm75_read_value(client, LM75_REG_CONF); | |
254 | if (status < 0) { | |
255 | dev_dbg(&client->dev, "Can't read config? %d\n", status); | |
13ac7a01 | 256 | return status; |
9ebd3d82 DB |
257 | } |
258 | data->orig_conf = status; | |
259 | new = status & ~clr_mask; | |
260 | new |= set_mask; | |
261 | if (status != new) | |
262 | lm75_write_value(client, LM75_REG_CONF, new); | |
263 | dev_dbg(&client->dev, "Config %02x\n", new); | |
264 | ||
265 | /* Register sysfs hooks */ | |
266 | status = sysfs_create_group(&client->dev.kobj, &lm75_group); | |
267 | if (status) | |
13ac7a01 | 268 | return status; |
9ebd3d82 DB |
269 | |
270 | data->hwmon_dev = hwmon_device_register(&client->dev); | |
271 | if (IS_ERR(data->hwmon_dev)) { | |
272 | status = PTR_ERR(data->hwmon_dev); | |
273 | goto exit_remove; | |
274 | } | |
275 | ||
276 | dev_info(&client->dev, "%s: sensor '%s'\n", | |
739cf3a2 | 277 | dev_name(data->hwmon_dev), client->name); |
9ebd3d82 DB |
278 | |
279 | return 0; | |
280 | ||
281 | exit_remove: | |
282 | sysfs_remove_group(&client->dev.kobj, &lm75_group); | |
9ebd3d82 DB |
283 | return status; |
284 | } | |
285 | ||
286 | static int lm75_remove(struct i2c_client *client) | |
287 | { | |
288 | struct lm75_data *data = i2c_get_clientdata(client); | |
289 | ||
290 | hwmon_device_unregister(data->hwmon_dev); | |
291 | sysfs_remove_group(&client->dev.kobj, &lm75_group); | |
292 | lm75_write_value(client, LM75_REG_CONF, data->orig_conf); | |
9ebd3d82 DB |
293 | return 0; |
294 | } | |
295 | ||
296 | static const struct i2c_device_id lm75_ids[] = { | |
e96f9d89 | 297 | { "adt75", adt75, }, |
9ebd3d82 DB |
298 | { "ds1775", ds1775, }, |
299 | { "ds75", ds75, }, | |
3fbc81e3 | 300 | { "ds7505", ds7505, }, |
c98d6c65 | 301 | { "g751", g751, }, |
9ebd3d82 DB |
302 | { "lm75", lm75, }, |
303 | { "lm75a", lm75a, }, | |
304 | { "max6625", max6625, }, | |
305 | { "max6626", max6626, }, | |
306 | { "mcp980x", mcp980x, }, | |
307 | { "stds75", stds75, }, | |
308 | { "tcn75", tcn75, }, | |
309 | { "tmp100", tmp100, }, | |
310 | { "tmp101", tmp101, }, | |
6d034059 | 311 | { "tmp105", tmp105, }, |
9ebd3d82 DB |
312 | { "tmp175", tmp175, }, |
313 | { "tmp275", tmp275, }, | |
314 | { "tmp75", tmp75, }, | |
315 | { /* LIST END */ } | |
316 | }; | |
317 | MODULE_DEVICE_TABLE(i2c, lm75_ids); | |
318 | ||
05e82fe4 LS |
319 | #define LM75A_ID 0xA1 |
320 | ||
8ff69eeb | 321 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
310ec792 | 322 | static int lm75_detect(struct i2c_client *new_client, |
8ff69eeb | 323 | struct i2c_board_info *info) |
1da177e4 | 324 | { |
8ff69eeb | 325 | struct i2c_adapter *adapter = new_client->adapter; |
1da177e4 | 326 | int i; |
e76f67b5 | 327 | int conf, hyst, os; |
05e82fe4 | 328 | bool is_lm75a = 0; |
1da177e4 | 329 | |
1da177e4 LT |
330 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
331 | I2C_FUNC_SMBUS_WORD_DATA)) | |
8ff69eeb | 332 | return -ENODEV; |
1da177e4 | 333 | |
426343ef JD |
334 | /* |
335 | * Now, we do the remaining detection. There is no identification- | |
336 | * dedicated register so we have to rely on several tricks: | |
337 | * unused bits, registers cycling over 8-address boundaries, | |
338 | * addresses 0x04-0x07 returning the last read value. | |
339 | * The cycling+unused addresses combination is not tested, | |
340 | * since it would significantly slow the detection down and would | |
341 | * hardly add any value. | |
342 | * | |
343 | * The National Semiconductor LM75A is different than earlier | |
344 | * LM75s. It has an ID byte of 0xaX (where X is the chip | |
345 | * revision, with 1 being the only revision in existence) in | |
346 | * register 7, and unused registers return 0xff rather than the | |
347 | * last read value. | |
348 | * | |
349 | * Note that this function only detects the original National | |
350 | * Semiconductor LM75 and the LM75A. Clones from other vendors | |
351 | * aren't detected, on purpose, because they are typically never | |
352 | * found on PC hardware. They are found on embedded designs where | |
353 | * they can be instantiated explicitly so detection is not needed. | |
354 | * The absence of identification registers on all these clones | |
355 | * would make their exhaustive detection very difficult and weak, | |
356 | * and odds are that the driver would bind to unsupported devices. | |
357 | */ | |
1da177e4 | 358 | |
e76f67b5 | 359 | /* Unused bits */ |
52df6440 | 360 | conf = i2c_smbus_read_byte_data(new_client, 1); |
e76f67b5 JD |
361 | if (conf & 0xe0) |
362 | return -ENODEV; | |
05e82fe4 LS |
363 | |
364 | /* First check for LM75A */ | |
365 | if (i2c_smbus_read_byte_data(new_client, 7) == LM75A_ID) { | |
366 | /* LM75A returns 0xff on unused registers so | |
367 | just to be sure we check for that too. */ | |
368 | if (i2c_smbus_read_byte_data(new_client, 4) != 0xff | |
369 | || i2c_smbus_read_byte_data(new_client, 5) != 0xff | |
370 | || i2c_smbus_read_byte_data(new_client, 6) != 0xff) | |
371 | return -ENODEV; | |
372 | is_lm75a = 1; | |
e76f67b5 JD |
373 | hyst = i2c_smbus_read_byte_data(new_client, 2); |
374 | os = i2c_smbus_read_byte_data(new_client, 3); | |
05e82fe4 LS |
375 | } else { /* Traditional style LM75 detection */ |
376 | /* Unused addresses */ | |
e76f67b5 JD |
377 | hyst = i2c_smbus_read_byte_data(new_client, 2); |
378 | if (i2c_smbus_read_byte_data(new_client, 4) != hyst | |
379 | || i2c_smbus_read_byte_data(new_client, 5) != hyst | |
380 | || i2c_smbus_read_byte_data(new_client, 6) != hyst | |
381 | || i2c_smbus_read_byte_data(new_client, 7) != hyst) | |
05e82fe4 | 382 | return -ENODEV; |
e76f67b5 JD |
383 | os = i2c_smbus_read_byte_data(new_client, 3); |
384 | if (i2c_smbus_read_byte_data(new_client, 4) != os | |
385 | || i2c_smbus_read_byte_data(new_client, 5) != os | |
386 | || i2c_smbus_read_byte_data(new_client, 6) != os | |
387 | || i2c_smbus_read_byte_data(new_client, 7) != os) | |
05e82fe4 LS |
388 | return -ENODEV; |
389 | } | |
1da177e4 | 390 | |
52df6440 | 391 | /* Addresses cycling */ |
e76f67b5 | 392 | for (i = 8; i <= 248; i += 40) { |
52df6440 | 393 | if (i2c_smbus_read_byte_data(new_client, i + 1) != conf |
e76f67b5 JD |
394 | || i2c_smbus_read_byte_data(new_client, i + 2) != hyst |
395 | || i2c_smbus_read_byte_data(new_client, i + 3) != os) | |
52df6440 | 396 | return -ENODEV; |
05e82fe4 LS |
397 | if (is_lm75a && i2c_smbus_read_byte_data(new_client, i + 7) |
398 | != LM75A_ID) | |
399 | return -ENODEV; | |
1da177e4 LT |
400 | } |
401 | ||
05e82fe4 | 402 | strlcpy(info->type, is_lm75a ? "lm75a" : "lm75", I2C_NAME_SIZE); |
c1685f61 | 403 | |
1da177e4 | 404 | return 0; |
01a52397 DB |
405 | } |
406 | ||
9914518e SD |
407 | #ifdef CONFIG_PM |
408 | static int lm75_suspend(struct device *dev) | |
409 | { | |
410 | int status; | |
411 | struct i2c_client *client = to_i2c_client(dev); | |
412 | status = lm75_read_value(client, LM75_REG_CONF); | |
413 | if (status < 0) { | |
414 | dev_dbg(&client->dev, "Can't read config? %d\n", status); | |
415 | return status; | |
416 | } | |
417 | status = status | LM75_SHUTDOWN; | |
418 | lm75_write_value(client, LM75_REG_CONF, status); | |
419 | return 0; | |
420 | } | |
421 | ||
422 | static int lm75_resume(struct device *dev) | |
423 | { | |
424 | int status; | |
425 | struct i2c_client *client = to_i2c_client(dev); | |
426 | status = lm75_read_value(client, LM75_REG_CONF); | |
427 | if (status < 0) { | |
428 | dev_dbg(&client->dev, "Can't read config? %d\n", status); | |
429 | return status; | |
430 | } | |
431 | status = status & ~LM75_SHUTDOWN; | |
432 | lm75_write_value(client, LM75_REG_CONF, status); | |
433 | return 0; | |
434 | } | |
435 | ||
436 | static const struct dev_pm_ops lm75_dev_pm_ops = { | |
437 | .suspend = lm75_suspend, | |
438 | .resume = lm75_resume, | |
439 | }; | |
440 | #define LM75_DEV_PM_OPS (&lm75_dev_pm_ops) | |
441 | #else | |
442 | #define LM75_DEV_PM_OPS NULL | |
443 | #endif /* CONFIG_PM */ | |
444 | ||
8ff69eeb JD |
445 | static struct i2c_driver lm75_driver = { |
446 | .class = I2C_CLASS_HWMON, | |
01a52397 | 447 | .driver = { |
8ff69eeb | 448 | .name = "lm75", |
9914518e | 449 | .pm = LM75_DEV_PM_OPS, |
01a52397 | 450 | }, |
8ff69eeb JD |
451 | .probe = lm75_probe, |
452 | .remove = lm75_remove, | |
453 | .id_table = lm75_ids, | |
454 | .detect = lm75_detect, | |
c3813d6a | 455 | .address_list = normal_i2c, |
01a52397 DB |
456 | }; |
457 | ||
458 | /*-----------------------------------------------------------------------*/ | |
459 | ||
460 | /* register access */ | |
461 | ||
caaa0f36 S |
462 | /* |
463 | * All registers are word-sized, except for the configuration register. | |
464 | * LM75 uses a high-byte first convention, which is exactly opposite to | |
465 | * the SMBus standard. | |
466 | */ | |
1da177e4 LT |
467 | static int lm75_read_value(struct i2c_client *client, u8 reg) |
468 | { | |
469 | if (reg == LM75_REG_CONF) | |
470 | return i2c_smbus_read_byte_data(client, reg); | |
90f4102c JD |
471 | else |
472 | return i2c_smbus_read_word_swapped(client, reg); | |
1da177e4 LT |
473 | } |
474 | ||
1da177e4 LT |
475 | static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value) |
476 | { | |
477 | if (reg == LM75_REG_CONF) | |
478 | return i2c_smbus_write_byte_data(client, reg, value); | |
479 | else | |
90f4102c | 480 | return i2c_smbus_write_word_swapped(client, reg, value); |
1da177e4 LT |
481 | } |
482 | ||
1da177e4 LT |
483 | static struct lm75_data *lm75_update_device(struct device *dev) |
484 | { | |
485 | struct i2c_client *client = to_i2c_client(dev); | |
486 | struct lm75_data *data = i2c_get_clientdata(client); | |
1f962f36 | 487 | struct lm75_data *ret = data; |
1da177e4 | 488 | |
9a61bf63 | 489 | mutex_lock(&data->update_lock); |
1da177e4 | 490 | |
87d0621a | 491 | if (time_after(jiffies, data->last_updated + data->sample_time) |
1da177e4 | 492 | || !data->valid) { |
9ca8e40c | 493 | int i; |
1da177e4 LT |
494 | dev_dbg(&client->dev, "Starting lm75 update\n"); |
495 | ||
bcccc3a2 DB |
496 | for (i = 0; i < ARRAY_SIZE(data->temp); i++) { |
497 | int status; | |
498 | ||
499 | status = lm75_read_value(client, LM75_REG_TEMP[i]); | |
1f962f36 FM |
500 | if (unlikely(status < 0)) { |
501 | dev_dbg(dev, | |
502 | "LM75: Failed to read value: reg %d, error %d\n", | |
503 | LM75_REG_TEMP[i], status); | |
504 | ret = ERR_PTR(status); | |
505 | data->valid = 0; | |
506 | goto abort; | |
507 | } | |
508 | data->temp[i] = status; | |
bcccc3a2 | 509 | } |
1da177e4 LT |
510 | data->last_updated = jiffies; |
511 | data->valid = 1; | |
512 | } | |
513 | ||
1f962f36 | 514 | abort: |
9a61bf63 | 515 | mutex_unlock(&data->update_lock); |
1f962f36 | 516 | return ret; |
1da177e4 LT |
517 | } |
518 | ||
f0967eea | 519 | module_i2c_driver(lm75_driver); |
1da177e4 LT |
520 | |
521 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"); | |
522 | MODULE_DESCRIPTION("LM75 driver"); | |
523 | MODULE_LICENSE("GPL"); |