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Commit | Line | Data |
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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> |
1da177e4 LT |
31 | #include "lm75.h" |
32 | ||
33 | ||
01a52397 DB |
34 | /* |
35 | * This driver handles the LM75 and compatible digital temperature sensors. | |
01a52397 DB |
36 | */ |
37 | ||
9ebd3d82 | 38 | enum lm75_type { /* keep sorted in alphabetical order */ |
e96f9d89 | 39 | adt75, |
1f86df49 | 40 | ds1775, |
9ebd3d82 | 41 | ds75, |
3fbc81e3 | 42 | ds7505, |
c98d6c65 | 43 | g751, |
1f86df49 | 44 | lm75, |
9ebd3d82 | 45 | lm75a, |
799fc602 | 46 | lm75b, |
9ebd3d82 DB |
47 | max6625, |
48 | max6626, | |
49 | mcp980x, | |
50 | stds75, | |
51 | tcn75, | |
52 | tmp100, | |
53 | tmp101, | |
6d034059 | 54 | tmp105, |
c83959f8 | 55 | tmp112, |
9ebd3d82 DB |
56 | tmp175, |
57 | tmp275, | |
58 | tmp75, | |
9c32e815 | 59 | tmp75c, |
9ebd3d82 DB |
60 | }; |
61 | ||
8ff69eeb | 62 | /* Addresses scanned */ |
25e9c86d | 63 | static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, |
1da177e4 | 64 | 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; |
1da177e4 | 65 | |
1da177e4 LT |
66 | |
67 | /* The LM75 registers */ | |
e65365fe | 68 | #define LM75_REG_TEMP 0x00 |
1da177e4 | 69 | #define LM75_REG_CONF 0x01 |
e65365fe GR |
70 | #define LM75_REG_HYST 0x02 |
71 | #define LM75_REG_MAX 0x03 | |
1da177e4 LT |
72 | |
73 | /* Each client has this additional data */ | |
74 | struct lm75_data { | |
d663ec49 | 75 | struct i2c_client *client; |
e65365fe | 76 | struct regmap *regmap; |
9ebd3d82 | 77 | u8 orig_conf; |
87d0621a JD |
78 | u8 resolution; /* In bits, between 9 and 12 */ |
79 | u8 resolution_limits; | |
e65365fe | 80 | unsigned int sample_time; /* In ms */ |
1da177e4 LT |
81 | }; |
82 | ||
01a52397 DB |
83 | /*-----------------------------------------------------------------------*/ |
84 | ||
22e73183 EV |
85 | static inline long lm75_reg_to_mc(s16 temp, u8 resolution) |
86 | { | |
87 | return ((temp >> (16 - resolution)) * 1000) >> (resolution - 8); | |
88 | } | |
89 | ||
08b02433 GR |
90 | static int lm75_read(struct device *dev, enum hwmon_sensor_types type, |
91 | u32 attr, int channel, long *val) | |
22e73183 | 92 | { |
e65365fe | 93 | struct lm75_data *data = dev_get_drvdata(dev); |
08b02433 GR |
94 | unsigned int regval; |
95 | int err, reg; | |
96 | ||
97 | switch (type) { | |
98 | case hwmon_chip: | |
99 | switch (attr) { | |
100 | case hwmon_chip_update_interval: | |
101 | *val = data->sample_time; | |
102 | break;; | |
103 | default: | |
104 | return -EINVAL; | |
105 | } | |
106 | break; | |
107 | case hwmon_temp: | |
108 | switch (attr) { | |
109 | case hwmon_temp_input: | |
110 | reg = LM75_REG_TEMP; | |
111 | break; | |
112 | case hwmon_temp_max: | |
113 | reg = LM75_REG_MAX; | |
114 | break; | |
115 | case hwmon_temp_max_hyst: | |
116 | reg = LM75_REG_HYST; | |
117 | break; | |
118 | default: | |
119 | return -EINVAL; | |
120 | } | |
121 | err = regmap_read(data->regmap, reg, ®val); | |
122 | if (err < 0) | |
123 | return err; | |
124 | ||
125 | *val = lm75_reg_to_mc(regval, data->resolution); | |
126 | break; | |
127 | default: | |
128 | return -EINVAL; | |
129 | } | |
22e73183 EV |
130 | return 0; |
131 | } | |
132 | ||
08b02433 GR |
133 | static int lm75_write(struct device *dev, enum hwmon_sensor_types type, |
134 | u32 attr, int channel, long temp) | |
9ca8e40c | 135 | { |
e65365fe | 136 | struct lm75_data *data = dev_get_drvdata(dev); |
87d0621a | 137 | u8 resolution; |
08b02433 GR |
138 | int reg; |
139 | ||
140 | if (type != hwmon_temp) | |
141 | return -EINVAL; | |
e3cd9528 | 142 | |
08b02433 GR |
143 | switch (attr) { |
144 | case hwmon_temp_max: | |
145 | reg = LM75_REG_MAX; | |
146 | break; | |
147 | case hwmon_temp_max_hyst: | |
148 | reg = LM75_REG_HYST; | |
149 | break; | |
150 | default: | |
151 | return -EINVAL; | |
152 | } | |
9ca8e40c | 153 | |
87d0621a JD |
154 | /* |
155 | * Resolution of limit registers is assumed to be the same as the | |
156 | * temperature input register resolution unless given explicitly. | |
157 | */ | |
08b02433 | 158 | if (data->resolution_limits) |
87d0621a JD |
159 | resolution = data->resolution_limits; |
160 | else | |
161 | resolution = data->resolution; | |
162 | ||
87d0621a | 163 | temp = clamp_val(temp, LM75_TEMP_MIN, LM75_TEMP_MAX); |
e65365fe GR |
164 | temp = DIV_ROUND_CLOSEST(temp << (resolution - 8), |
165 | 1000) << (16 - resolution); | |
e65365fe | 166 | |
08b02433 | 167 | return regmap_write(data->regmap, reg, temp); |
1da177e4 | 168 | } |
1da177e4 | 169 | |
08b02433 GR |
170 | static umode_t lm75_is_visible(const void *data, enum hwmon_sensor_types type, |
171 | u32 attr, int channel) | |
5f7e5e29 | 172 | { |
08b02433 GR |
173 | switch (type) { |
174 | case hwmon_chip: | |
175 | switch (attr) { | |
176 | case hwmon_chip_update_interval: | |
177 | return S_IRUGO; | |
178 | } | |
179 | break; | |
180 | case hwmon_temp: | |
181 | switch (attr) { | |
182 | case hwmon_temp_input: | |
183 | return S_IRUGO; | |
184 | case hwmon_temp_max: | |
185 | case hwmon_temp_max_hyst: | |
186 | return S_IRUGO | S_IWUSR; | |
187 | } | |
188 | break; | |
189 | default: | |
190 | break; | |
191 | } | |
192 | return 0; | |
5f7e5e29 GR |
193 | } |
194 | ||
08b02433 | 195 | /*-----------------------------------------------------------------------*/ |
1da177e4 | 196 | |
08b02433 | 197 | /* device probe and removal */ |
c1685f61 | 198 | |
08b02433 GR |
199 | /* chip configuration */ |
200 | ||
201 | static const u32 lm75_chip_config[] = { | |
202 | HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL, | |
203 | 0 | |
c1685f61 | 204 | }; |
c1685f61 | 205 | |
08b02433 GR |
206 | static const struct hwmon_channel_info lm75_chip = { |
207 | .type = hwmon_chip, | |
208 | .config = lm75_chip_config, | |
2251aef6 EV |
209 | }; |
210 | ||
08b02433 GR |
211 | static const u32 lm75_temp_config[] = { |
212 | HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST, | |
213 | 0 | |
214 | }; | |
01a52397 | 215 | |
08b02433 GR |
216 | static const struct hwmon_channel_info lm75_temp = { |
217 | .type = hwmon_temp, | |
218 | .config = lm75_temp_config, | |
219 | }; | |
220 | ||
221 | static const struct hwmon_channel_info *lm75_info[] = { | |
222 | &lm75_chip, | |
223 | &lm75_temp, | |
224 | NULL | |
225 | }; | |
226 | ||
227 | static const struct hwmon_ops lm75_hwmon_ops = { | |
228 | .is_visible = lm75_is_visible, | |
229 | .read = lm75_read, | |
230 | .write = lm75_write, | |
231 | }; | |
232 | ||
233 | static const struct hwmon_chip_info lm75_chip_info = { | |
234 | .ops = &lm75_hwmon_ops, | |
235 | .info = lm75_info, | |
236 | }; | |
9ebd3d82 | 237 | |
e65365fe GR |
238 | static bool lm75_is_writeable_reg(struct device *dev, unsigned int reg) |
239 | { | |
240 | return reg != LM75_REG_TEMP; | |
241 | } | |
242 | ||
243 | static bool lm75_is_volatile_reg(struct device *dev, unsigned int reg) | |
244 | { | |
245 | return reg == LM75_REG_TEMP; | |
246 | } | |
247 | ||
248 | static const struct regmap_config lm75_regmap_config = { | |
249 | .reg_bits = 8, | |
250 | .val_bits = 16, | |
251 | .max_register = LM75_REG_MAX, | |
252 | .writeable_reg = lm75_is_writeable_reg, | |
253 | .volatile_reg = lm75_is_volatile_reg, | |
254 | .val_format_endian = REGMAP_ENDIAN_BIG, | |
255 | .cache_type = REGCACHE_RBTREE, | |
256 | .use_single_rw = true, | |
257 | }; | |
258 | ||
9e37d3e2 GR |
259 | static void lm75_remove(void *data) |
260 | { | |
261 | struct lm75_data *lm75 = data; | |
262 | struct i2c_client *client = lm75->client; | |
263 | ||
264 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, lm75->orig_conf); | |
265 | } | |
266 | ||
9ebd3d82 DB |
267 | static int |
268 | lm75_probe(struct i2c_client *client, const struct i2c_device_id *id) | |
269 | { | |
d663ec49 | 270 | struct device *dev = &client->dev; |
9e37d3e2 | 271 | struct device *hwmon_dev; |
9ebd3d82 | 272 | struct lm75_data *data; |
90e2b545 | 273 | int status, err; |
9ebd3d82 DB |
274 | u8 set_mask, clr_mask; |
275 | int new; | |
0cd2c72d | 276 | enum lm75_type kind = id->driver_data; |
9ebd3d82 DB |
277 | |
278 | if (!i2c_check_functionality(client->adapter, | |
279 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) | |
280 | return -EIO; | |
281 | ||
d663ec49 | 282 | data = devm_kzalloc(dev, sizeof(struct lm75_data), GFP_KERNEL); |
9ebd3d82 DB |
283 | if (!data) |
284 | return -ENOMEM; | |
285 | ||
d663ec49 | 286 | data->client = client; |
e65365fe GR |
287 | |
288 | data->regmap = devm_regmap_init_i2c(client, &lm75_regmap_config); | |
289 | if (IS_ERR(data->regmap)) | |
290 | return PTR_ERR(data->regmap); | |
9ebd3d82 DB |
291 | |
292 | /* Set to LM75 resolution (9 bits, 1/2 degree C) and range. | |
293 | * Then tweak to be more precise when appropriate. | |
294 | */ | |
295 | set_mask = 0; | |
8a5c5cc6 JD |
296 | clr_mask = LM75_SHUTDOWN; /* continuous conversions */ |
297 | ||
0cd2c72d | 298 | switch (kind) { |
8a5c5cc6 JD |
299 | case adt75: |
300 | clr_mask |= 1 << 5; /* not one-shot mode */ | |
0cd2c72d | 301 | data->resolution = 12; |
e65365fe | 302 | data->sample_time = MSEC_PER_SEC / 8; |
8a5c5cc6 JD |
303 | break; |
304 | case ds1775: | |
305 | case ds75: | |
306 | case stds75: | |
0cd2c72d JD |
307 | clr_mask |= 3 << 5; |
308 | set_mask |= 2 << 5; /* 11-bit mode */ | |
309 | data->resolution = 11; | |
e65365fe | 310 | data->sample_time = MSEC_PER_SEC; |
0cd2c72d | 311 | break; |
3fbc81e3 JD |
312 | case ds7505: |
313 | set_mask |= 3 << 5; /* 12-bit mode */ | |
314 | data->resolution = 12; | |
e65365fe | 315 | data->sample_time = MSEC_PER_SEC / 4; |
3fbc81e3 | 316 | break; |
c98d6c65 | 317 | case g751: |
0cd2c72d JD |
318 | case lm75: |
319 | case lm75a: | |
320 | data->resolution = 9; | |
e65365fe | 321 | data->sample_time = MSEC_PER_SEC / 2; |
0cd2c72d | 322 | break; |
799fc602 MT |
323 | case lm75b: |
324 | data->resolution = 11; | |
e65365fe | 325 | data->sample_time = MSEC_PER_SEC / 4; |
799fc602 | 326 | break; |
0cd2c72d JD |
327 | case max6625: |
328 | data->resolution = 9; | |
e65365fe | 329 | data->sample_time = MSEC_PER_SEC / 4; |
0cd2c72d JD |
330 | break; |
331 | case max6626: | |
332 | data->resolution = 12; | |
333 | data->resolution_limits = 9; | |
e65365fe | 334 | data->sample_time = MSEC_PER_SEC / 4; |
0cd2c72d JD |
335 | break; |
336 | case tcn75: | |
337 | data->resolution = 9; | |
e65365fe | 338 | data->sample_time = MSEC_PER_SEC / 8; |
8a5c5cc6 JD |
339 | break; |
340 | case mcp980x: | |
0cd2c72d JD |
341 | data->resolution_limits = 9; |
342 | /* fall through */ | |
8a5c5cc6 JD |
343 | case tmp100: |
344 | case tmp101: | |
0cd2c72d JD |
345 | set_mask |= 3 << 5; /* 12-bit mode */ |
346 | data->resolution = 12; | |
e65365fe | 347 | data->sample_time = MSEC_PER_SEC; |
0cd2c72d JD |
348 | clr_mask |= 1 << 7; /* not one-shot mode */ |
349 | break; | |
c83959f8 FK |
350 | case tmp112: |
351 | set_mask |= 3 << 5; /* 12-bit mode */ | |
352 | clr_mask |= 1 << 7; /* not one-shot mode */ | |
353 | data->resolution = 12; | |
e65365fe | 354 | data->sample_time = MSEC_PER_SEC / 4; |
c83959f8 | 355 | break; |
8a5c5cc6 JD |
356 | case tmp105: |
357 | case tmp175: | |
358 | case tmp275: | |
359 | case tmp75: | |
0cd2c72d | 360 | set_mask |= 3 << 5; /* 12-bit mode */ |
8a5c5cc6 | 361 | clr_mask |= 1 << 7; /* not one-shot mode */ |
0cd2c72d | 362 | data->resolution = 12; |
e65365fe | 363 | data->sample_time = MSEC_PER_SEC / 2; |
8a5c5cc6 | 364 | break; |
9c32e815 BG |
365 | case tmp75c: |
366 | clr_mask |= 1 << 5; /* not one-shot mode */ | |
367 | data->resolution = 12; | |
e65365fe | 368 | data->sample_time = MSEC_PER_SEC / 4; |
9c32e815 | 369 | break; |
8a5c5cc6 | 370 | } |
9ebd3d82 DB |
371 | |
372 | /* configure as specified */ | |
38aefb41 | 373 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
9ebd3d82 | 374 | if (status < 0) { |
d663ec49 | 375 | dev_dbg(dev, "Can't read config? %d\n", status); |
13ac7a01 | 376 | return status; |
9ebd3d82 DB |
377 | } |
378 | data->orig_conf = status; | |
379 | new = status & ~clr_mask; | |
380 | new |= set_mask; | |
381 | if (status != new) | |
38aefb41 | 382 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, new); |
9ebd3d82 | 383 | |
90e2b545 GR |
384 | err = devm_add_action_or_reset(dev, lm75_remove, data); |
385 | if (err) | |
386 | return err; | |
9ebd3d82 | 387 | |
9e37d3e2 | 388 | dev_dbg(dev, "Config %02x\n", new); |
22e73183 | 389 | |
08b02433 GR |
390 | hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, |
391 | data, &lm75_chip_info, | |
392 | NULL); | |
9e37d3e2 GR |
393 | if (IS_ERR(hwmon_dev)) |
394 | return PTR_ERR(hwmon_dev); | |
9ebd3d82 | 395 | |
9e37d3e2 | 396 | dev_info(dev, "%s: sensor '%s'\n", dev_name(hwmon_dev), client->name); |
9ebd3d82 | 397 | |
9ebd3d82 DB |
398 | return 0; |
399 | } | |
400 | ||
401 | static const struct i2c_device_id lm75_ids[] = { | |
e96f9d89 | 402 | { "adt75", adt75, }, |
9ebd3d82 DB |
403 | { "ds1775", ds1775, }, |
404 | { "ds75", ds75, }, | |
3fbc81e3 | 405 | { "ds7505", ds7505, }, |
c98d6c65 | 406 | { "g751", g751, }, |
9ebd3d82 DB |
407 | { "lm75", lm75, }, |
408 | { "lm75a", lm75a, }, | |
799fc602 | 409 | { "lm75b", lm75b, }, |
9ebd3d82 DB |
410 | { "max6625", max6625, }, |
411 | { "max6626", max6626, }, | |
412 | { "mcp980x", mcp980x, }, | |
413 | { "stds75", stds75, }, | |
414 | { "tcn75", tcn75, }, | |
415 | { "tmp100", tmp100, }, | |
416 | { "tmp101", tmp101, }, | |
6d034059 | 417 | { "tmp105", tmp105, }, |
c83959f8 | 418 | { "tmp112", tmp112, }, |
9ebd3d82 DB |
419 | { "tmp175", tmp175, }, |
420 | { "tmp275", tmp275, }, | |
421 | { "tmp75", tmp75, }, | |
9c32e815 | 422 | { "tmp75c", tmp75c, }, |
9ebd3d82 DB |
423 | { /* LIST END */ } |
424 | }; | |
425 | MODULE_DEVICE_TABLE(i2c, lm75_ids); | |
426 | ||
05e82fe4 LS |
427 | #define LM75A_ID 0xA1 |
428 | ||
8ff69eeb | 429 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
310ec792 | 430 | static int lm75_detect(struct i2c_client *new_client, |
8ff69eeb | 431 | struct i2c_board_info *info) |
1da177e4 | 432 | { |
8ff69eeb | 433 | struct i2c_adapter *adapter = new_client->adapter; |
1da177e4 | 434 | int i; |
e76f67b5 | 435 | int conf, hyst, os; |
05e82fe4 | 436 | bool is_lm75a = 0; |
1da177e4 | 437 | |
1da177e4 LT |
438 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
439 | I2C_FUNC_SMBUS_WORD_DATA)) | |
8ff69eeb | 440 | return -ENODEV; |
1da177e4 | 441 | |
426343ef JD |
442 | /* |
443 | * Now, we do the remaining detection. There is no identification- | |
444 | * dedicated register so we have to rely on several tricks: | |
445 | * unused bits, registers cycling over 8-address boundaries, | |
446 | * addresses 0x04-0x07 returning the last read value. | |
447 | * The cycling+unused addresses combination is not tested, | |
448 | * since it would significantly slow the detection down and would | |
449 | * hardly add any value. | |
450 | * | |
451 | * The National Semiconductor LM75A is different than earlier | |
452 | * LM75s. It has an ID byte of 0xaX (where X is the chip | |
453 | * revision, with 1 being the only revision in existence) in | |
454 | * register 7, and unused registers return 0xff rather than the | |
455 | * last read value. | |
456 | * | |
457 | * Note that this function only detects the original National | |
458 | * Semiconductor LM75 and the LM75A. Clones from other vendors | |
459 | * aren't detected, on purpose, because they are typically never | |
460 | * found on PC hardware. They are found on embedded designs where | |
461 | * they can be instantiated explicitly so detection is not needed. | |
462 | * The absence of identification registers on all these clones | |
463 | * would make their exhaustive detection very difficult and weak, | |
464 | * and odds are that the driver would bind to unsupported devices. | |
465 | */ | |
1da177e4 | 466 | |
e76f67b5 | 467 | /* Unused bits */ |
52df6440 | 468 | conf = i2c_smbus_read_byte_data(new_client, 1); |
e76f67b5 JD |
469 | if (conf & 0xe0) |
470 | return -ENODEV; | |
05e82fe4 LS |
471 | |
472 | /* First check for LM75A */ | |
473 | if (i2c_smbus_read_byte_data(new_client, 7) == LM75A_ID) { | |
474 | /* LM75A returns 0xff on unused registers so | |
475 | just to be sure we check for that too. */ | |
476 | if (i2c_smbus_read_byte_data(new_client, 4) != 0xff | |
477 | || i2c_smbus_read_byte_data(new_client, 5) != 0xff | |
478 | || i2c_smbus_read_byte_data(new_client, 6) != 0xff) | |
479 | return -ENODEV; | |
480 | is_lm75a = 1; | |
e76f67b5 JD |
481 | hyst = i2c_smbus_read_byte_data(new_client, 2); |
482 | os = i2c_smbus_read_byte_data(new_client, 3); | |
05e82fe4 LS |
483 | } else { /* Traditional style LM75 detection */ |
484 | /* Unused addresses */ | |
e76f67b5 JD |
485 | hyst = i2c_smbus_read_byte_data(new_client, 2); |
486 | if (i2c_smbus_read_byte_data(new_client, 4) != hyst | |
487 | || i2c_smbus_read_byte_data(new_client, 5) != hyst | |
488 | || i2c_smbus_read_byte_data(new_client, 6) != hyst | |
489 | || i2c_smbus_read_byte_data(new_client, 7) != hyst) | |
05e82fe4 | 490 | return -ENODEV; |
e76f67b5 JD |
491 | os = i2c_smbus_read_byte_data(new_client, 3); |
492 | if (i2c_smbus_read_byte_data(new_client, 4) != os | |
493 | || i2c_smbus_read_byte_data(new_client, 5) != os | |
494 | || i2c_smbus_read_byte_data(new_client, 6) != os | |
495 | || i2c_smbus_read_byte_data(new_client, 7) != os) | |
05e82fe4 LS |
496 | return -ENODEV; |
497 | } | |
4ad40cc5 GR |
498 | /* |
499 | * It is very unlikely that this is a LM75 if both | |
500 | * hysteresis and temperature limit registers are 0. | |
501 | */ | |
502 | if (hyst == 0 && os == 0) | |
503 | return -ENODEV; | |
1da177e4 | 504 | |
52df6440 | 505 | /* Addresses cycling */ |
e76f67b5 | 506 | for (i = 8; i <= 248; i += 40) { |
52df6440 | 507 | if (i2c_smbus_read_byte_data(new_client, i + 1) != conf |
e76f67b5 JD |
508 | || i2c_smbus_read_byte_data(new_client, i + 2) != hyst |
509 | || i2c_smbus_read_byte_data(new_client, i + 3) != os) | |
52df6440 | 510 | return -ENODEV; |
05e82fe4 LS |
511 | if (is_lm75a && i2c_smbus_read_byte_data(new_client, i + 7) |
512 | != LM75A_ID) | |
513 | return -ENODEV; | |
1da177e4 LT |
514 | } |
515 | ||
05e82fe4 | 516 | strlcpy(info->type, is_lm75a ? "lm75a" : "lm75", I2C_NAME_SIZE); |
c1685f61 | 517 | |
1da177e4 | 518 | return 0; |
01a52397 DB |
519 | } |
520 | ||
9914518e SD |
521 | #ifdef CONFIG_PM |
522 | static int lm75_suspend(struct device *dev) | |
523 | { | |
524 | int status; | |
525 | struct i2c_client *client = to_i2c_client(dev); | |
38aefb41 | 526 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
9914518e SD |
527 | if (status < 0) { |
528 | dev_dbg(&client->dev, "Can't read config? %d\n", status); | |
529 | return status; | |
530 | } | |
531 | status = status | LM75_SHUTDOWN; | |
38aefb41 | 532 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, status); |
9914518e SD |
533 | return 0; |
534 | } | |
535 | ||
536 | static int lm75_resume(struct device *dev) | |
537 | { | |
538 | int status; | |
539 | struct i2c_client *client = to_i2c_client(dev); | |
38aefb41 | 540 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
9914518e SD |
541 | if (status < 0) { |
542 | dev_dbg(&client->dev, "Can't read config? %d\n", status); | |
543 | return status; | |
544 | } | |
545 | status = status & ~LM75_SHUTDOWN; | |
38aefb41 | 546 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, status); |
9914518e SD |
547 | return 0; |
548 | } | |
549 | ||
550 | static const struct dev_pm_ops lm75_dev_pm_ops = { | |
551 | .suspend = lm75_suspend, | |
552 | .resume = lm75_resume, | |
553 | }; | |
554 | #define LM75_DEV_PM_OPS (&lm75_dev_pm_ops) | |
555 | #else | |
556 | #define LM75_DEV_PM_OPS NULL | |
557 | #endif /* CONFIG_PM */ | |
558 | ||
8ff69eeb JD |
559 | static struct i2c_driver lm75_driver = { |
560 | .class = I2C_CLASS_HWMON, | |
01a52397 | 561 | .driver = { |
8ff69eeb | 562 | .name = "lm75", |
9914518e | 563 | .pm = LM75_DEV_PM_OPS, |
01a52397 | 564 | }, |
8ff69eeb | 565 | .probe = lm75_probe, |
8ff69eeb JD |
566 | .id_table = lm75_ids, |
567 | .detect = lm75_detect, | |
c3813d6a | 568 | .address_list = normal_i2c, |
01a52397 DB |
569 | }; |
570 | ||
f0967eea | 571 | module_i2c_driver(lm75_driver); |
1da177e4 LT |
572 | |
573 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"); | |
574 | MODULE_DESCRIPTION("LM75 driver"); | |
575 | MODULE_LICENSE("GPL"); |