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> |
22e73183 | 29 | #include <linux/of.h> |
e65365fe | 30 | #include <linux/regmap.h> |
22e73183 | 31 | #include <linux/thermal.h> |
1da177e4 LT |
32 | #include "lm75.h" |
33 | ||
34 | ||
01a52397 DB |
35 | /* |
36 | * This driver handles the LM75 and compatible digital temperature sensors. | |
01a52397 DB |
37 | */ |
38 | ||
9ebd3d82 | 39 | enum lm75_type { /* keep sorted in alphabetical order */ |
e96f9d89 | 40 | adt75, |
1f86df49 | 41 | ds1775, |
9ebd3d82 | 42 | ds75, |
3fbc81e3 | 43 | ds7505, |
c98d6c65 | 44 | g751, |
1f86df49 | 45 | lm75, |
9ebd3d82 | 46 | lm75a, |
799fc602 | 47 | lm75b, |
9ebd3d82 DB |
48 | max6625, |
49 | max6626, | |
50 | mcp980x, | |
51 | stds75, | |
52 | tcn75, | |
53 | tmp100, | |
54 | tmp101, | |
6d034059 | 55 | tmp105, |
c83959f8 | 56 | tmp112, |
9ebd3d82 DB |
57 | tmp175, |
58 | tmp275, | |
59 | tmp75, | |
9c32e815 | 60 | tmp75c, |
9ebd3d82 DB |
61 | }; |
62 | ||
8ff69eeb | 63 | /* Addresses scanned */ |
25e9c86d | 64 | static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, |
1da177e4 | 65 | 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; |
1da177e4 | 66 | |
1da177e4 LT |
67 | |
68 | /* The LM75 registers */ | |
e65365fe | 69 | #define LM75_REG_TEMP 0x00 |
1da177e4 | 70 | #define LM75_REG_CONF 0x01 |
e65365fe GR |
71 | #define LM75_REG_HYST 0x02 |
72 | #define LM75_REG_MAX 0x03 | |
1da177e4 LT |
73 | |
74 | /* Each client has this additional data */ | |
75 | struct lm75_data { | |
d663ec49 | 76 | struct i2c_client *client; |
e65365fe | 77 | struct regmap *regmap; |
9ebd3d82 | 78 | u8 orig_conf; |
87d0621a JD |
79 | u8 resolution; /* In bits, between 9 and 12 */ |
80 | u8 resolution_limits; | |
e65365fe | 81 | unsigned int sample_time; /* In ms */ |
1da177e4 LT |
82 | }; |
83 | ||
01a52397 DB |
84 | /*-----------------------------------------------------------------------*/ |
85 | ||
22e73183 EV |
86 | static inline long lm75_reg_to_mc(s16 temp, u8 resolution) |
87 | { | |
88 | return ((temp >> (16 - resolution)) * 1000) >> (resolution - 8); | |
89 | } | |
90 | ||
01a52397 | 91 | /* sysfs attributes for hwmon */ |
1da177e4 | 92 | |
17e8351a | 93 | static int lm75_read_temp(void *dev, int *temp) |
22e73183 | 94 | { |
e65365fe GR |
95 | struct lm75_data *data = dev_get_drvdata(dev); |
96 | unsigned int _temp; | |
97 | int err; | |
22e73183 | 98 | |
e65365fe GR |
99 | err = regmap_read(data->regmap, LM75_REG_TEMP, &_temp); |
100 | if (err < 0) | |
101 | return err; | |
22e73183 | 102 | |
e65365fe | 103 | *temp = lm75_reg_to_mc(_temp, data->resolution); |
22e73183 EV |
104 | |
105 | return 0; | |
106 | } | |
107 | ||
9ca8e40c JD |
108 | static ssize_t show_temp(struct device *dev, struct device_attribute *da, |
109 | char *buf) | |
110 | { | |
111 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
e65365fe GR |
112 | struct lm75_data *data = dev_get_drvdata(dev); |
113 | unsigned int temp = 0; | |
114 | int err; | |
1f962f36 | 115 | |
e65365fe GR |
116 | err = regmap_read(data->regmap, attr->index, &temp); |
117 | if (err < 0) | |
118 | return err; | |
1f962f36 | 119 | |
e65365fe | 120 | return sprintf(buf, "%ld\n", lm75_reg_to_mc(temp, data->resolution)); |
1da177e4 | 121 | } |
9ca8e40c JD |
122 | |
123 | static ssize_t set_temp(struct device *dev, struct device_attribute *da, | |
124 | const char *buf, size_t count) | |
125 | { | |
126 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
d663ec49 | 127 | struct lm75_data *data = dev_get_drvdata(dev); |
e3cd9528 S |
128 | long temp; |
129 | int error; | |
87d0621a | 130 | u8 resolution; |
e3cd9528 | 131 | |
24edc0a7 | 132 | error = kstrtol(buf, 10, &temp); |
e3cd9528 S |
133 | if (error) |
134 | return error; | |
9ca8e40c | 135 | |
87d0621a JD |
136 | /* |
137 | * Resolution of limit registers is assumed to be the same as the | |
138 | * temperature input register resolution unless given explicitly. | |
139 | */ | |
140 | if (attr->index && data->resolution_limits) | |
141 | resolution = data->resolution_limits; | |
142 | else | |
143 | resolution = data->resolution; | |
144 | ||
87d0621a | 145 | temp = clamp_val(temp, LM75_TEMP_MIN, LM75_TEMP_MAX); |
e65365fe GR |
146 | temp = DIV_ROUND_CLOSEST(temp << (resolution - 8), |
147 | 1000) << (16 - resolution); | |
148 | error = regmap_write(data->regmap, attr->index, temp); | |
149 | if (error < 0) | |
150 | return error; | |
151 | ||
9ca8e40c | 152 | return count; |
1da177e4 | 153 | } |
1da177e4 | 154 | |
5f7e5e29 GR |
155 | static ssize_t show_update_interval(struct device *dev, |
156 | struct device_attribute *da, char *buf) | |
157 | { | |
e65365fe | 158 | struct lm75_data *data = dev_get_drvdata(dev); |
5f7e5e29 | 159 | |
e65365fe | 160 | return sprintf(buf, "%u\n", data->sample_time); |
5f7e5e29 GR |
161 | } |
162 | ||
9ca8e40c | 163 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, |
e65365fe | 164 | show_temp, set_temp, LM75_REG_MAX); |
9ca8e40c | 165 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, |
e65365fe GR |
166 | show_temp, set_temp, LM75_REG_HYST); |
167 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, LM75_REG_TEMP); | |
5f7e5e29 | 168 | static DEVICE_ATTR(update_interval, S_IRUGO, show_update_interval, NULL); |
1da177e4 | 169 | |
d663ec49 | 170 | static struct attribute *lm75_attrs[] = { |
9ca8e40c JD |
171 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
172 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
173 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
5f7e5e29 | 174 | &dev_attr_update_interval.attr, |
c1685f61 MH |
175 | |
176 | NULL | |
177 | }; | |
d663ec49 | 178 | ATTRIBUTE_GROUPS(lm75); |
c1685f61 | 179 | |
2251aef6 EV |
180 | static const struct thermal_zone_of_device_ops lm75_of_thermal_ops = { |
181 | .get_temp = lm75_read_temp, | |
182 | }; | |
183 | ||
01a52397 DB |
184 | /*-----------------------------------------------------------------------*/ |
185 | ||
8ff69eeb | 186 | /* device probe and removal */ |
9ebd3d82 | 187 | |
e65365fe GR |
188 | static bool lm75_is_writeable_reg(struct device *dev, unsigned int reg) |
189 | { | |
190 | return reg != LM75_REG_TEMP; | |
191 | } | |
192 | ||
193 | static bool lm75_is_volatile_reg(struct device *dev, unsigned int reg) | |
194 | { | |
195 | return reg == LM75_REG_TEMP; | |
196 | } | |
197 | ||
198 | static const struct regmap_config lm75_regmap_config = { | |
199 | .reg_bits = 8, | |
200 | .val_bits = 16, | |
201 | .max_register = LM75_REG_MAX, | |
202 | .writeable_reg = lm75_is_writeable_reg, | |
203 | .volatile_reg = lm75_is_volatile_reg, | |
204 | .val_format_endian = REGMAP_ENDIAN_BIG, | |
205 | .cache_type = REGCACHE_RBTREE, | |
206 | .use_single_rw = true, | |
207 | }; | |
208 | ||
9e37d3e2 GR |
209 | static void lm75_remove(void *data) |
210 | { | |
211 | struct lm75_data *lm75 = data; | |
212 | struct i2c_client *client = lm75->client; | |
213 | ||
214 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, lm75->orig_conf); | |
215 | } | |
216 | ||
9ebd3d82 DB |
217 | static int |
218 | lm75_probe(struct i2c_client *client, const struct i2c_device_id *id) | |
219 | { | |
d663ec49 | 220 | struct device *dev = &client->dev; |
9e37d3e2 | 221 | struct device *hwmon_dev; |
9ebd3d82 | 222 | struct lm75_data *data; |
90e2b545 | 223 | int status, err; |
9ebd3d82 DB |
224 | u8 set_mask, clr_mask; |
225 | int new; | |
0cd2c72d | 226 | enum lm75_type kind = id->driver_data; |
9ebd3d82 DB |
227 | |
228 | if (!i2c_check_functionality(client->adapter, | |
229 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) | |
230 | return -EIO; | |
231 | ||
d663ec49 | 232 | data = devm_kzalloc(dev, sizeof(struct lm75_data), GFP_KERNEL); |
9ebd3d82 DB |
233 | if (!data) |
234 | return -ENOMEM; | |
235 | ||
d663ec49 | 236 | data->client = client; |
e65365fe GR |
237 | |
238 | data->regmap = devm_regmap_init_i2c(client, &lm75_regmap_config); | |
239 | if (IS_ERR(data->regmap)) | |
240 | return PTR_ERR(data->regmap); | |
9ebd3d82 DB |
241 | |
242 | /* Set to LM75 resolution (9 bits, 1/2 degree C) and range. | |
243 | * Then tweak to be more precise when appropriate. | |
244 | */ | |
245 | set_mask = 0; | |
8a5c5cc6 JD |
246 | clr_mask = LM75_SHUTDOWN; /* continuous conversions */ |
247 | ||
0cd2c72d | 248 | switch (kind) { |
8a5c5cc6 JD |
249 | case adt75: |
250 | clr_mask |= 1 << 5; /* not one-shot mode */ | |
0cd2c72d | 251 | data->resolution = 12; |
e65365fe | 252 | data->sample_time = MSEC_PER_SEC / 8; |
8a5c5cc6 JD |
253 | break; |
254 | case ds1775: | |
255 | case ds75: | |
256 | case stds75: | |
0cd2c72d JD |
257 | clr_mask |= 3 << 5; |
258 | set_mask |= 2 << 5; /* 11-bit mode */ | |
259 | data->resolution = 11; | |
e65365fe | 260 | data->sample_time = MSEC_PER_SEC; |
0cd2c72d | 261 | break; |
3fbc81e3 JD |
262 | case ds7505: |
263 | set_mask |= 3 << 5; /* 12-bit mode */ | |
264 | data->resolution = 12; | |
e65365fe | 265 | data->sample_time = MSEC_PER_SEC / 4; |
3fbc81e3 | 266 | break; |
c98d6c65 | 267 | case g751: |
0cd2c72d JD |
268 | case lm75: |
269 | case lm75a: | |
270 | data->resolution = 9; | |
e65365fe | 271 | data->sample_time = MSEC_PER_SEC / 2; |
0cd2c72d | 272 | break; |
799fc602 MT |
273 | case lm75b: |
274 | data->resolution = 11; | |
e65365fe | 275 | data->sample_time = MSEC_PER_SEC / 4; |
799fc602 | 276 | break; |
0cd2c72d JD |
277 | case max6625: |
278 | data->resolution = 9; | |
e65365fe | 279 | data->sample_time = MSEC_PER_SEC / 4; |
0cd2c72d JD |
280 | break; |
281 | case max6626: | |
282 | data->resolution = 12; | |
283 | data->resolution_limits = 9; | |
e65365fe | 284 | data->sample_time = MSEC_PER_SEC / 4; |
0cd2c72d JD |
285 | break; |
286 | case tcn75: | |
287 | data->resolution = 9; | |
e65365fe | 288 | data->sample_time = MSEC_PER_SEC / 8; |
8a5c5cc6 JD |
289 | break; |
290 | case mcp980x: | |
0cd2c72d JD |
291 | data->resolution_limits = 9; |
292 | /* fall through */ | |
8a5c5cc6 JD |
293 | case tmp100: |
294 | case tmp101: | |
0cd2c72d JD |
295 | set_mask |= 3 << 5; /* 12-bit mode */ |
296 | data->resolution = 12; | |
e65365fe | 297 | data->sample_time = MSEC_PER_SEC; |
0cd2c72d JD |
298 | clr_mask |= 1 << 7; /* not one-shot mode */ |
299 | break; | |
c83959f8 FK |
300 | case tmp112: |
301 | set_mask |= 3 << 5; /* 12-bit mode */ | |
302 | clr_mask |= 1 << 7; /* not one-shot mode */ | |
303 | data->resolution = 12; | |
e65365fe | 304 | data->sample_time = MSEC_PER_SEC / 4; |
c83959f8 | 305 | break; |
8a5c5cc6 JD |
306 | case tmp105: |
307 | case tmp175: | |
308 | case tmp275: | |
309 | case tmp75: | |
0cd2c72d | 310 | set_mask |= 3 << 5; /* 12-bit mode */ |
8a5c5cc6 | 311 | clr_mask |= 1 << 7; /* not one-shot mode */ |
0cd2c72d | 312 | data->resolution = 12; |
e65365fe | 313 | data->sample_time = MSEC_PER_SEC / 2; |
8a5c5cc6 | 314 | break; |
9c32e815 BG |
315 | case tmp75c: |
316 | clr_mask |= 1 << 5; /* not one-shot mode */ | |
317 | data->resolution = 12; | |
e65365fe | 318 | data->sample_time = MSEC_PER_SEC / 4; |
9c32e815 | 319 | break; |
8a5c5cc6 | 320 | } |
9ebd3d82 DB |
321 | |
322 | /* configure as specified */ | |
38aefb41 | 323 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
9ebd3d82 | 324 | if (status < 0) { |
d663ec49 | 325 | dev_dbg(dev, "Can't read config? %d\n", status); |
13ac7a01 | 326 | return status; |
9ebd3d82 DB |
327 | } |
328 | data->orig_conf = status; | |
329 | new = status & ~clr_mask; | |
330 | new |= set_mask; | |
331 | if (status != new) | |
38aefb41 | 332 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, new); |
9ebd3d82 | 333 | |
90e2b545 GR |
334 | err = devm_add_action_or_reset(dev, lm75_remove, data); |
335 | if (err) | |
336 | return err; | |
9ebd3d82 | 337 | |
9e37d3e2 | 338 | dev_dbg(dev, "Config %02x\n", new); |
22e73183 | 339 | |
9e37d3e2 GR |
340 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
341 | data, lm75_groups); | |
342 | if (IS_ERR(hwmon_dev)) | |
343 | return PTR_ERR(hwmon_dev); | |
9ebd3d82 | 344 | |
9e37d3e2 GR |
345 | devm_thermal_zone_of_sensor_register(hwmon_dev, 0, |
346 | hwmon_dev, | |
347 | &lm75_of_thermal_ops); | |
9ebd3d82 | 348 | |
9e37d3e2 | 349 | dev_info(dev, "%s: sensor '%s'\n", dev_name(hwmon_dev), client->name); |
9ebd3d82 | 350 | |
9ebd3d82 DB |
351 | return 0; |
352 | } | |
353 | ||
354 | static const struct i2c_device_id lm75_ids[] = { | |
e96f9d89 | 355 | { "adt75", adt75, }, |
9ebd3d82 DB |
356 | { "ds1775", ds1775, }, |
357 | { "ds75", ds75, }, | |
3fbc81e3 | 358 | { "ds7505", ds7505, }, |
c98d6c65 | 359 | { "g751", g751, }, |
9ebd3d82 DB |
360 | { "lm75", lm75, }, |
361 | { "lm75a", lm75a, }, | |
799fc602 | 362 | { "lm75b", lm75b, }, |
9ebd3d82 DB |
363 | { "max6625", max6625, }, |
364 | { "max6626", max6626, }, | |
365 | { "mcp980x", mcp980x, }, | |
366 | { "stds75", stds75, }, | |
367 | { "tcn75", tcn75, }, | |
368 | { "tmp100", tmp100, }, | |
369 | { "tmp101", tmp101, }, | |
6d034059 | 370 | { "tmp105", tmp105, }, |
c83959f8 | 371 | { "tmp112", tmp112, }, |
9ebd3d82 DB |
372 | { "tmp175", tmp175, }, |
373 | { "tmp275", tmp275, }, | |
374 | { "tmp75", tmp75, }, | |
9c32e815 | 375 | { "tmp75c", tmp75c, }, |
9ebd3d82 DB |
376 | { /* LIST END */ } |
377 | }; | |
378 | MODULE_DEVICE_TABLE(i2c, lm75_ids); | |
379 | ||
05e82fe4 LS |
380 | #define LM75A_ID 0xA1 |
381 | ||
8ff69eeb | 382 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
310ec792 | 383 | static int lm75_detect(struct i2c_client *new_client, |
8ff69eeb | 384 | struct i2c_board_info *info) |
1da177e4 | 385 | { |
8ff69eeb | 386 | struct i2c_adapter *adapter = new_client->adapter; |
1da177e4 | 387 | int i; |
e76f67b5 | 388 | int conf, hyst, os; |
05e82fe4 | 389 | bool is_lm75a = 0; |
1da177e4 | 390 | |
1da177e4 LT |
391 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
392 | I2C_FUNC_SMBUS_WORD_DATA)) | |
8ff69eeb | 393 | return -ENODEV; |
1da177e4 | 394 | |
426343ef JD |
395 | /* |
396 | * Now, we do the remaining detection. There is no identification- | |
397 | * dedicated register so we have to rely on several tricks: | |
398 | * unused bits, registers cycling over 8-address boundaries, | |
399 | * addresses 0x04-0x07 returning the last read value. | |
400 | * The cycling+unused addresses combination is not tested, | |
401 | * since it would significantly slow the detection down and would | |
402 | * hardly add any value. | |
403 | * | |
404 | * The National Semiconductor LM75A is different than earlier | |
405 | * LM75s. It has an ID byte of 0xaX (where X is the chip | |
406 | * revision, with 1 being the only revision in existence) in | |
407 | * register 7, and unused registers return 0xff rather than the | |
408 | * last read value. | |
409 | * | |
410 | * Note that this function only detects the original National | |
411 | * Semiconductor LM75 and the LM75A. Clones from other vendors | |
412 | * aren't detected, on purpose, because they are typically never | |
413 | * found on PC hardware. They are found on embedded designs where | |
414 | * they can be instantiated explicitly so detection is not needed. | |
415 | * The absence of identification registers on all these clones | |
416 | * would make their exhaustive detection very difficult and weak, | |
417 | * and odds are that the driver would bind to unsupported devices. | |
418 | */ | |
1da177e4 | 419 | |
e76f67b5 | 420 | /* Unused bits */ |
52df6440 | 421 | conf = i2c_smbus_read_byte_data(new_client, 1); |
e76f67b5 JD |
422 | if (conf & 0xe0) |
423 | return -ENODEV; | |
05e82fe4 LS |
424 | |
425 | /* First check for LM75A */ | |
426 | if (i2c_smbus_read_byte_data(new_client, 7) == LM75A_ID) { | |
427 | /* LM75A returns 0xff on unused registers so | |
428 | just to be sure we check for that too. */ | |
429 | if (i2c_smbus_read_byte_data(new_client, 4) != 0xff | |
430 | || i2c_smbus_read_byte_data(new_client, 5) != 0xff | |
431 | || i2c_smbus_read_byte_data(new_client, 6) != 0xff) | |
432 | return -ENODEV; | |
433 | is_lm75a = 1; | |
e76f67b5 JD |
434 | hyst = i2c_smbus_read_byte_data(new_client, 2); |
435 | os = i2c_smbus_read_byte_data(new_client, 3); | |
05e82fe4 LS |
436 | } else { /* Traditional style LM75 detection */ |
437 | /* Unused addresses */ | |
e76f67b5 JD |
438 | hyst = i2c_smbus_read_byte_data(new_client, 2); |
439 | if (i2c_smbus_read_byte_data(new_client, 4) != hyst | |
440 | || i2c_smbus_read_byte_data(new_client, 5) != hyst | |
441 | || i2c_smbus_read_byte_data(new_client, 6) != hyst | |
442 | || i2c_smbus_read_byte_data(new_client, 7) != hyst) | |
05e82fe4 | 443 | return -ENODEV; |
e76f67b5 JD |
444 | os = i2c_smbus_read_byte_data(new_client, 3); |
445 | if (i2c_smbus_read_byte_data(new_client, 4) != os | |
446 | || i2c_smbus_read_byte_data(new_client, 5) != os | |
447 | || i2c_smbus_read_byte_data(new_client, 6) != os | |
448 | || i2c_smbus_read_byte_data(new_client, 7) != os) | |
05e82fe4 LS |
449 | return -ENODEV; |
450 | } | |
4ad40cc5 GR |
451 | /* |
452 | * It is very unlikely that this is a LM75 if both | |
453 | * hysteresis and temperature limit registers are 0. | |
454 | */ | |
455 | if (hyst == 0 && os == 0) | |
456 | return -ENODEV; | |
1da177e4 | 457 | |
52df6440 | 458 | /* Addresses cycling */ |
e76f67b5 | 459 | for (i = 8; i <= 248; i += 40) { |
52df6440 | 460 | if (i2c_smbus_read_byte_data(new_client, i + 1) != conf |
e76f67b5 JD |
461 | || i2c_smbus_read_byte_data(new_client, i + 2) != hyst |
462 | || i2c_smbus_read_byte_data(new_client, i + 3) != os) | |
52df6440 | 463 | return -ENODEV; |
05e82fe4 LS |
464 | if (is_lm75a && i2c_smbus_read_byte_data(new_client, i + 7) |
465 | != LM75A_ID) | |
466 | return -ENODEV; | |
1da177e4 LT |
467 | } |
468 | ||
05e82fe4 | 469 | strlcpy(info->type, is_lm75a ? "lm75a" : "lm75", I2C_NAME_SIZE); |
c1685f61 | 470 | |
1da177e4 | 471 | return 0; |
01a52397 DB |
472 | } |
473 | ||
9914518e SD |
474 | #ifdef CONFIG_PM |
475 | static int lm75_suspend(struct device *dev) | |
476 | { | |
477 | int status; | |
478 | struct i2c_client *client = to_i2c_client(dev); | |
38aefb41 | 479 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
9914518e SD |
480 | if (status < 0) { |
481 | dev_dbg(&client->dev, "Can't read config? %d\n", status); | |
482 | return status; | |
483 | } | |
484 | status = status | LM75_SHUTDOWN; | |
38aefb41 | 485 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, status); |
9914518e SD |
486 | return 0; |
487 | } | |
488 | ||
489 | static int lm75_resume(struct device *dev) | |
490 | { | |
491 | int status; | |
492 | struct i2c_client *client = to_i2c_client(dev); | |
38aefb41 | 493 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
9914518e SD |
494 | if (status < 0) { |
495 | dev_dbg(&client->dev, "Can't read config? %d\n", status); | |
496 | return status; | |
497 | } | |
498 | status = status & ~LM75_SHUTDOWN; | |
38aefb41 | 499 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, status); |
9914518e SD |
500 | return 0; |
501 | } | |
502 | ||
503 | static const struct dev_pm_ops lm75_dev_pm_ops = { | |
504 | .suspend = lm75_suspend, | |
505 | .resume = lm75_resume, | |
506 | }; | |
507 | #define LM75_DEV_PM_OPS (&lm75_dev_pm_ops) | |
508 | #else | |
509 | #define LM75_DEV_PM_OPS NULL | |
510 | #endif /* CONFIG_PM */ | |
511 | ||
8ff69eeb JD |
512 | static struct i2c_driver lm75_driver = { |
513 | .class = I2C_CLASS_HWMON, | |
01a52397 | 514 | .driver = { |
8ff69eeb | 515 | .name = "lm75", |
9914518e | 516 | .pm = LM75_DEV_PM_OPS, |
01a52397 | 517 | }, |
8ff69eeb | 518 | .probe = lm75_probe, |
8ff69eeb JD |
519 | .id_table = lm75_ids, |
520 | .detect = lm75_detect, | |
c3813d6a | 521 | .address_list = normal_i2c, |
01a52397 DB |
522 | }; |
523 | ||
f0967eea | 524 | module_i2c_driver(lm75_driver); |
1da177e4 LT |
525 | |
526 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"); | |
527 | MODULE_DESCRIPTION("LM75 driver"); | |
528 | MODULE_LICENSE("GPL"); |