Commit | Line | Data |
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74ba9207 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
caaa0f36 S |
3 | * lm75.c - Part of lm_sensors, Linux kernel modules for hardware |
4 | * monitoring | |
5 | * Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> | |
caaa0f36 | 6 | */ |
1da177e4 | 7 | |
1da177e4 LT |
8 | #include <linux/module.h> |
9 | #include <linux/init.h> | |
10 | #include <linux/slab.h> | |
11 | #include <linux/jiffies.h> | |
12 | #include <linux/i2c.h> | |
943b0830 | 13 | #include <linux/hwmon.h> |
9ca8e40c | 14 | #include <linux/hwmon-sysfs.h> |
943b0830 | 15 | #include <linux/err.h> |
e97a45f1 | 16 | #include <linux/of_device.h> |
22e73183 | 17 | #include <linux/of.h> |
e65365fe | 18 | #include <linux/regmap.h> |
4b5be3c1 | 19 | #include <linux/util_macros.h> |
1da177e4 LT |
20 | #include "lm75.h" |
21 | ||
01a52397 DB |
22 | /* |
23 | * This driver handles the LM75 and compatible digital temperature sensors. | |
01a52397 DB |
24 | */ |
25 | ||
9ebd3d82 | 26 | enum lm75_type { /* keep sorted in alphabetical order */ |
e96f9d89 | 27 | adt75, |
1f86df49 | 28 | ds1775, |
9ebd3d82 | 29 | ds75, |
3fbc81e3 | 30 | ds7505, |
c98d6c65 | 31 | g751, |
1f86df49 | 32 | lm75, |
9ebd3d82 | 33 | lm75a, |
799fc602 | 34 | lm75b, |
9ebd3d82 DB |
35 | max6625, |
36 | max6626, | |
a54ca77a | 37 | max31725, |
9ebd3d82 | 38 | mcp980x, |
557c7ffa | 39 | pct2075, |
9ebd3d82 | 40 | stds75, |
2e9a41bb | 41 | stlm75, |
9ebd3d82 DB |
42 | tcn75, |
43 | tmp100, | |
44 | tmp101, | |
6d034059 | 45 | tmp105, |
c83959f8 | 46 | tmp112, |
9ebd3d82 DB |
47 | tmp175, |
48 | tmp275, | |
49 | tmp75, | |
39abe9d8 | 50 | tmp75b, |
9c32e815 | 51 | tmp75c, |
9ebd3d82 DB |
52 | }; |
53 | ||
dcb12653 IPPS |
54 | /** |
55 | * struct lm75_params - lm75 configuration parameters. | |
56 | * @set_mask: Bits to set in configuration register when configuring | |
57 | * the chip. | |
58 | * @clr_mask: Bits to clear in configuration register when configuring | |
59 | * the chip. | |
60 | * @default_resolution: Default number of bits to represent the temperature | |
61 | * value. | |
62 | * @resolution_limits: Limit register resolution. Optional. Should be set if | |
63 | * the resolution of limit registers does not match the | |
64 | * resolution of the temperature register. | |
7f1a300f IPPS |
65 | * @resolutions: List of resolutions associated with sample times. |
66 | * Optional. Should be set if num_sample_times is larger | |
67 | * than 1, and if the resolution changes with sample times. | |
68 | * If set, number of entries must match num_sample_times. | |
69 | * @default_sample_time:Sample time to be set by default. | |
70 | * @num_sample_times: Number of possible sample times to be set. Optional. | |
71 | * Should be set if the number of sample times is larger | |
72 | * than one. | |
73 | * @sample_times: All the possible sample times to be set. Mandatory if | |
74 | * num_sample_times is larger than 1. If set, number of | |
75 | * entries must match num_sample_times. | |
dcb12653 IPPS |
76 | */ |
77 | ||
78 | struct lm75_params { | |
7f1a300f IPPS |
79 | u8 set_mask; |
80 | u8 clr_mask; | |
81 | u8 default_resolution; | |
82 | u8 resolution_limits; | |
83 | const u8 *resolutions; | |
84 | unsigned int default_sample_time; | |
85 | u8 num_sample_times; | |
86 | const unsigned int *sample_times; | |
dcb12653 IPPS |
87 | }; |
88 | ||
8ff69eeb | 89 | /* Addresses scanned */ |
25e9c86d | 90 | static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, |
1da177e4 | 91 | 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; |
1da177e4 | 92 | |
1da177e4 | 93 | /* The LM75 registers */ |
e65365fe | 94 | #define LM75_REG_TEMP 0x00 |
1da177e4 | 95 | #define LM75_REG_CONF 0x01 |
e65365fe GR |
96 | #define LM75_REG_HYST 0x02 |
97 | #define LM75_REG_MAX 0x03 | |
1da177e4 LT |
98 | |
99 | /* Each client has this additional data */ | |
100 | struct lm75_data { | |
dcb12653 IPPS |
101 | struct i2c_client *client; |
102 | struct regmap *regmap; | |
103 | u8 orig_conf; | |
104 | u8 current_conf; | |
105 | u8 resolution; /* In bits, 9 to 16 */ | |
106 | unsigned int sample_time; /* In ms */ | |
107 | enum lm75_type kind; | |
108 | const struct lm75_params *params; | |
1da177e4 LT |
109 | }; |
110 | ||
01a52397 | 111 | /*-----------------------------------------------------------------------*/ |
7db0db3f GR |
112 | |
113 | static const u8 lm75_sample_set_masks[] = { 0 << 5, 1 << 5, 2 << 5, 3 << 5 }; | |
114 | ||
115 | #define LM75_SAMPLE_CLEAR_MASK (3 << 5) | |
116 | ||
dcb12653 IPPS |
117 | /* The structure below stores the configuration values of the supported devices. |
118 | * In case of being supported multiple configurations, the default one must | |
119 | * always be the first element of the array | |
120 | */ | |
121 | static const struct lm75_params device_params[] = { | |
122 | [adt75] = { | |
123 | .clr_mask = 1 << 5, /* not one-shot mode */ | |
124 | .default_resolution = 12, | |
125 | .default_sample_time = MSEC_PER_SEC / 8, | |
126 | }, | |
127 | [ds1775] = { | |
128 | .clr_mask = 3 << 5, | |
129 | .set_mask = 2 << 5, /* 11-bit mode */ | |
130 | .default_resolution = 11, | |
7db0db3f GR |
131 | .default_sample_time = 750, |
132 | .num_sample_times = 4, | |
133 | .sample_times = (unsigned int []){ 188, 375, 750, 1500 }, | |
134 | .resolutions = (u8 []) {9, 10, 11, 12 }, | |
dcb12653 IPPS |
135 | }, |
136 | [ds75] = { | |
137 | .clr_mask = 3 << 5, | |
138 | .set_mask = 2 << 5, /* 11-bit mode */ | |
139 | .default_resolution = 11, | |
7db0db3f GR |
140 | .default_sample_time = 600, |
141 | .num_sample_times = 4, | |
142 | .sample_times = (unsigned int []){ 150, 300, 600, 1200 }, | |
143 | .resolutions = (u8 []) {9, 10, 11, 12 }, | |
dcb12653 IPPS |
144 | }, |
145 | [stds75] = { | |
146 | .clr_mask = 3 << 5, | |
147 | .set_mask = 2 << 5, /* 11-bit mode */ | |
148 | .default_resolution = 11, | |
7db0db3f GR |
149 | .default_sample_time = 600, |
150 | .num_sample_times = 4, | |
151 | .sample_times = (unsigned int []){ 150, 300, 600, 1200 }, | |
152 | .resolutions = (u8 []) {9, 10, 11, 12 }, | |
dcb12653 IPPS |
153 | }, |
154 | [stlm75] = { | |
155 | .default_resolution = 9, | |
156 | .default_sample_time = MSEC_PER_SEC / 5, | |
157 | }, | |
158 | [ds7505] = { | |
159 | .set_mask = 3 << 5, /* 12-bit mode*/ | |
160 | .default_resolution = 12, | |
7db0db3f GR |
161 | .default_sample_time = 200, |
162 | .num_sample_times = 4, | |
163 | .sample_times = (unsigned int []){ 25, 50, 100, 200 }, | |
164 | .resolutions = (u8 []) {9, 10, 11, 12 }, | |
dcb12653 IPPS |
165 | }, |
166 | [g751] = { | |
167 | .default_resolution = 9, | |
168 | .default_sample_time = MSEC_PER_SEC / 2, | |
169 | }, | |
170 | [lm75] = { | |
171 | .default_resolution = 9, | |
172 | .default_sample_time = MSEC_PER_SEC / 2, | |
173 | }, | |
174 | [lm75a] = { | |
175 | .default_resolution = 9, | |
176 | .default_sample_time = MSEC_PER_SEC / 2, | |
177 | }, | |
178 | [lm75b] = { | |
179 | .default_resolution = 11, | |
180 | .default_sample_time = MSEC_PER_SEC / 4, | |
181 | }, | |
182 | [max6625] = { | |
183 | .default_resolution = 9, | |
184 | .default_sample_time = MSEC_PER_SEC / 4, | |
185 | }, | |
186 | [max6626] = { | |
187 | .default_resolution = 12, | |
188 | .default_sample_time = MSEC_PER_SEC / 4, | |
189 | .resolution_limits = 9, | |
190 | }, | |
191 | [max31725] = { | |
192 | .default_resolution = 16, | |
193 | .default_sample_time = MSEC_PER_SEC / 8, | |
194 | }, | |
195 | [tcn75] = { | |
196 | .default_resolution = 9, | |
197 | .default_sample_time = MSEC_PER_SEC / 8, | |
198 | }, | |
199 | [pct2075] = { | |
200 | .default_resolution = 11, | |
201 | .default_sample_time = MSEC_PER_SEC / 10, | |
202 | }, | |
203 | [mcp980x] = { | |
204 | .set_mask = 3 << 5, /* 12-bit mode */ | |
205 | .clr_mask = 1 << 7, /* not one-shot mode */ | |
206 | .default_resolution = 12, | |
207 | .resolution_limits = 9, | |
7db0db3f GR |
208 | .default_sample_time = 240, |
209 | .num_sample_times = 4, | |
210 | .sample_times = (unsigned int []){ 75, 150, 300, 600 }, | |
211 | .resolutions = (u8 []) {9, 10, 11, 12 }, | |
dcb12653 IPPS |
212 | }, |
213 | [tmp100] = { | |
214 | .set_mask = 3 << 5, /* 12-bit mode */ | |
215 | .clr_mask = 1 << 7, /* not one-shot mode */ | |
216 | .default_resolution = 12, | |
7db0db3f GR |
217 | .default_sample_time = 320, |
218 | .num_sample_times = 4, | |
219 | .sample_times = (unsigned int []){ 75, 150, 300, 600 }, | |
220 | .resolutions = (u8 []) {9, 10, 11, 12 }, | |
dcb12653 IPPS |
221 | }, |
222 | [tmp101] = { | |
223 | .set_mask = 3 << 5, /* 12-bit mode */ | |
224 | .clr_mask = 1 << 7, /* not one-shot mode */ | |
225 | .default_resolution = 12, | |
7db0db3f GR |
226 | .default_sample_time = 320, |
227 | .num_sample_times = 4, | |
228 | .sample_times = (unsigned int []){ 75, 150, 300, 600 }, | |
229 | .resolutions = (u8 []) {9, 10, 11, 12 }, | |
dcb12653 | 230 | }, |
7db0db3f | 231 | [tmp105] = { |
dcb12653 | 232 | .set_mask = 3 << 5, /* 12-bit mode */ |
7db0db3f | 233 | .clr_mask = 1 << 7, /* not one-shot mode*/ |
dcb12653 | 234 | .default_resolution = 12, |
7db0db3f GR |
235 | .default_sample_time = 220, |
236 | .num_sample_times = 4, | |
237 | .sample_times = (unsigned int []){ 38, 75, 150, 300 }, | |
238 | .resolutions = (u8 []) {9, 10, 11, 12 }, | |
dcb12653 | 239 | }, |
7db0db3f | 240 | [tmp112] = { |
dcb12653 | 241 | .set_mask = 3 << 5, /* 12-bit mode */ |
7db0db3f | 242 | .clr_mask = 1 << 7, /* no one-shot mode*/ |
dcb12653 | 243 | .default_resolution = 12, |
7db0db3f | 244 | .default_sample_time = MSEC_PER_SEC / 4, |
cee04a01 GR |
245 | .num_sample_times = 4, |
246 | .sample_times = (unsigned int []){ 125, 250, 1000, 4000 }, | |
dcb12653 IPPS |
247 | }, |
248 | [tmp175] = { | |
249 | .set_mask = 3 << 5, /* 12-bit mode */ | |
250 | .clr_mask = 1 << 7, /* not one-shot mode*/ | |
251 | .default_resolution = 12, | |
7db0db3f GR |
252 | .default_sample_time = 220, |
253 | .num_sample_times = 4, | |
254 | .sample_times = (unsigned int []){ 38, 75, 150, 300 }, | |
255 | .resolutions = (u8 []) {9, 10, 11, 12 }, | |
dcb12653 IPPS |
256 | }, |
257 | [tmp275] = { | |
258 | .set_mask = 3 << 5, /* 12-bit mode */ | |
259 | .clr_mask = 1 << 7, /* not one-shot mode*/ | |
260 | .default_resolution = 12, | |
7db0db3f GR |
261 | .default_sample_time = 220, |
262 | .num_sample_times = 4, | |
263 | .sample_times = (unsigned int []){ 38, 75, 150, 300 }, | |
264 | .resolutions = (u8 []) {9, 10, 11, 12 }, | |
dcb12653 IPPS |
265 | }, |
266 | [tmp75] = { | |
267 | .set_mask = 3 << 5, /* 12-bit mode */ | |
268 | .clr_mask = 1 << 7, /* not one-shot mode*/ | |
269 | .default_resolution = 12, | |
7db0db3f GR |
270 | .default_sample_time = 220, |
271 | .num_sample_times = 4, | |
272 | .sample_times = (unsigned int []){ 38, 75, 150, 300 }, | |
273 | .resolutions = (u8 []) {9, 10, 11, 12 }, | |
dcb12653 IPPS |
274 | }, |
275 | [tmp75b] = { /* not one-shot mode, Conversion rate 37Hz */ | |
276 | .clr_mask = 1 << 7 | 3 << 5, | |
277 | .default_resolution = 12, | |
278 | .default_sample_time = MSEC_PER_SEC / 37, | |
7f1a300f IPPS |
279 | .sample_times = (unsigned int []){ MSEC_PER_SEC / 37, |
280 | MSEC_PER_SEC / 18, | |
281 | MSEC_PER_SEC / 9, MSEC_PER_SEC / 4 }, | |
282 | .num_sample_times = 4, | |
dcb12653 IPPS |
283 | }, |
284 | [tmp75c] = { | |
285 | .clr_mask = 1 << 5, /*not one-shot mode*/ | |
286 | .default_resolution = 12, | |
287 | .default_sample_time = MSEC_PER_SEC / 4, | |
288 | } | |
289 | }; | |
01a52397 | 290 | |
22e73183 EV |
291 | static inline long lm75_reg_to_mc(s16 temp, u8 resolution) |
292 | { | |
293 | return ((temp >> (16 - resolution)) * 1000) >> (resolution - 8); | |
294 | } | |
295 | ||
58608cfe IPPS |
296 | static int lm75_write_config(struct lm75_data *data, u8 set_mask, |
297 | u8 clr_mask) | |
298 | { | |
299 | u8 value; | |
300 | ||
301 | clr_mask |= LM75_SHUTDOWN; | |
302 | value = data->current_conf & ~clr_mask; | |
303 | value |= set_mask; | |
304 | ||
305 | if (data->current_conf != value) { | |
306 | s32 err; | |
307 | ||
308 | err = i2c_smbus_write_byte_data(data->client, LM75_REG_CONF, | |
309 | value); | |
310 | if (err) | |
311 | return err; | |
312 | data->current_conf = value; | |
313 | } | |
314 | return 0; | |
315 | } | |
316 | ||
08b02433 GR |
317 | static int lm75_read(struct device *dev, enum hwmon_sensor_types type, |
318 | u32 attr, int channel, long *val) | |
22e73183 | 319 | { |
e65365fe | 320 | struct lm75_data *data = dev_get_drvdata(dev); |
08b02433 GR |
321 | unsigned int regval; |
322 | int err, reg; | |
323 | ||
324 | switch (type) { | |
325 | case hwmon_chip: | |
326 | switch (attr) { | |
327 | case hwmon_chip_update_interval: | |
328 | *val = data->sample_time; | |
ccffe776 | 329 | break; |
08b02433 GR |
330 | default: |
331 | return -EINVAL; | |
332 | } | |
333 | break; | |
334 | case hwmon_temp: | |
335 | switch (attr) { | |
336 | case hwmon_temp_input: | |
337 | reg = LM75_REG_TEMP; | |
338 | break; | |
339 | case hwmon_temp_max: | |
340 | reg = LM75_REG_MAX; | |
341 | break; | |
342 | case hwmon_temp_max_hyst: | |
343 | reg = LM75_REG_HYST; | |
344 | break; | |
345 | default: | |
346 | return -EINVAL; | |
347 | } | |
348 | err = regmap_read(data->regmap, reg, ®val); | |
349 | if (err < 0) | |
350 | return err; | |
351 | ||
352 | *val = lm75_reg_to_mc(regval, data->resolution); | |
353 | break; | |
354 | default: | |
355 | return -EINVAL; | |
356 | } | |
22e73183 EV |
357 | return 0; |
358 | } | |
359 | ||
4b5be3c1 | 360 | static int lm75_write_temp(struct device *dev, u32 attr, long temp) |
9ca8e40c | 361 | { |
e65365fe | 362 | struct lm75_data *data = dev_get_drvdata(dev); |
87d0621a | 363 | u8 resolution; |
08b02433 GR |
364 | int reg; |
365 | ||
08b02433 GR |
366 | switch (attr) { |
367 | case hwmon_temp_max: | |
368 | reg = LM75_REG_MAX; | |
369 | break; | |
370 | case hwmon_temp_max_hyst: | |
371 | reg = LM75_REG_HYST; | |
372 | break; | |
373 | default: | |
374 | return -EINVAL; | |
375 | } | |
9ca8e40c | 376 | |
87d0621a JD |
377 | /* |
378 | * Resolution of limit registers is assumed to be the same as the | |
379 | * temperature input register resolution unless given explicitly. | |
380 | */ | |
dcb12653 IPPS |
381 | if (data->params->resolution_limits) |
382 | resolution = data->params->resolution_limits; | |
87d0621a JD |
383 | else |
384 | resolution = data->resolution; | |
385 | ||
87d0621a | 386 | temp = clamp_val(temp, LM75_TEMP_MIN, LM75_TEMP_MAX); |
e65365fe GR |
387 | temp = DIV_ROUND_CLOSEST(temp << (resolution - 8), |
388 | 1000) << (16 - resolution); | |
e65365fe | 389 | |
7d82fcc9 | 390 | return regmap_write(data->regmap, reg, (u16)temp); |
1da177e4 | 391 | } |
1da177e4 | 392 | |
040b106f | 393 | static int lm75_update_interval(struct device *dev, long val) |
4b5be3c1 IPPS |
394 | { |
395 | struct lm75_data *data = dev_get_drvdata(dev); | |
cee04a01 | 396 | unsigned int reg; |
4b5be3c1 IPPS |
397 | u8 index; |
398 | s32 err; | |
399 | ||
040b106f GR |
400 | index = find_closest(val, data->params->sample_times, |
401 | (int)data->params->num_sample_times); | |
4b5be3c1 | 402 | |
cee04a01 GR |
403 | switch (data->kind) { |
404 | default: | |
405 | err = lm75_write_config(data, lm75_sample_set_masks[index], | |
406 | LM75_SAMPLE_CLEAR_MASK); | |
407 | if (err) | |
408 | return err; | |
040b106f | 409 | |
cee04a01 GR |
410 | data->sample_time = data->params->sample_times[index]; |
411 | if (data->params->resolutions) | |
412 | data->resolution = data->params->resolutions[index]; | |
413 | break; | |
414 | case tmp112: | |
415 | err = regmap_read(data->regmap, LM75_REG_CONF, ®); | |
416 | if (err < 0) | |
417 | return err; | |
418 | reg &= ~0x00c0; | |
419 | reg |= (3 - index) << 6; | |
420 | err = regmap_write(data->regmap, LM75_REG_CONF, reg); | |
421 | if (err < 0) | |
422 | return err; | |
423 | data->sample_time = data->params->sample_times[index]; | |
424 | break; | |
425 | } | |
040b106f GR |
426 | return 0; |
427 | } | |
428 | ||
429 | static int lm75_write_chip(struct device *dev, u32 attr, long val) | |
430 | { | |
431 | switch (attr) { | |
432 | case hwmon_chip_update_interval: | |
433 | return lm75_update_interval(dev, val); | |
4b5be3c1 IPPS |
434 | default: |
435 | return -EINVAL; | |
436 | } | |
437 | return 0; | |
438 | } | |
439 | ||
440 | static int lm75_write(struct device *dev, enum hwmon_sensor_types type, | |
441 | u32 attr, int channel, long val) | |
442 | { | |
443 | switch (type) { | |
444 | case hwmon_chip: | |
445 | return lm75_write_chip(dev, attr, val); | |
446 | case hwmon_temp: | |
447 | return lm75_write_temp(dev, attr, val); | |
448 | default: | |
449 | return -EINVAL; | |
450 | } | |
451 | return 0; | |
452 | } | |
453 | ||
08b02433 GR |
454 | static umode_t lm75_is_visible(const void *data, enum hwmon_sensor_types type, |
455 | u32 attr, int channel) | |
5f7e5e29 | 456 | { |
4b5be3c1 IPPS |
457 | const struct lm75_data *config_data = data; |
458 | ||
08b02433 GR |
459 | switch (type) { |
460 | case hwmon_chip: | |
461 | switch (attr) { | |
462 | case hwmon_chip_update_interval: | |
4b5be3c1 IPPS |
463 | if (config_data->params->num_sample_times > 1) |
464 | return 0644; | |
e6ab6e0e | 465 | return 0444; |
08b02433 GR |
466 | } |
467 | break; | |
468 | case hwmon_temp: | |
469 | switch (attr) { | |
470 | case hwmon_temp_input: | |
e6ab6e0e | 471 | return 0444; |
08b02433 GR |
472 | case hwmon_temp_max: |
473 | case hwmon_temp_max_hyst: | |
e6ab6e0e | 474 | return 0644; |
08b02433 GR |
475 | } |
476 | break; | |
477 | default: | |
478 | break; | |
479 | } | |
480 | return 0; | |
5f7e5e29 GR |
481 | } |
482 | ||
08b02433 | 483 | static const struct hwmon_channel_info *lm75_info[] = { |
e4f6fed1 GR |
484 | HWMON_CHANNEL_INFO(chip, |
485 | HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL), | |
486 | HWMON_CHANNEL_INFO(temp, | |
487 | HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST), | |
08b02433 GR |
488 | NULL |
489 | }; | |
490 | ||
491 | static const struct hwmon_ops lm75_hwmon_ops = { | |
492 | .is_visible = lm75_is_visible, | |
493 | .read = lm75_read, | |
494 | .write = lm75_write, | |
495 | }; | |
496 | ||
497 | static const struct hwmon_chip_info lm75_chip_info = { | |
498 | .ops = &lm75_hwmon_ops, | |
499 | .info = lm75_info, | |
500 | }; | |
9ebd3d82 | 501 | |
e65365fe GR |
502 | static bool lm75_is_writeable_reg(struct device *dev, unsigned int reg) |
503 | { | |
504 | return reg != LM75_REG_TEMP; | |
505 | } | |
506 | ||
507 | static bool lm75_is_volatile_reg(struct device *dev, unsigned int reg) | |
508 | { | |
cee04a01 | 509 | return reg == LM75_REG_TEMP || reg == LM75_REG_CONF; |
e65365fe GR |
510 | } |
511 | ||
512 | static const struct regmap_config lm75_regmap_config = { | |
513 | .reg_bits = 8, | |
514 | .val_bits = 16, | |
515 | .max_register = LM75_REG_MAX, | |
516 | .writeable_reg = lm75_is_writeable_reg, | |
517 | .volatile_reg = lm75_is_volatile_reg, | |
518 | .val_format_endian = REGMAP_ENDIAN_BIG, | |
519 | .cache_type = REGCACHE_RBTREE, | |
1c96a2f6 DF |
520 | .use_single_read = true, |
521 | .use_single_write = true, | |
e65365fe GR |
522 | }; |
523 | ||
9e37d3e2 GR |
524 | static void lm75_remove(void *data) |
525 | { | |
526 | struct lm75_data *lm75 = data; | |
527 | struct i2c_client *client = lm75->client; | |
528 | ||
529 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, lm75->orig_conf); | |
530 | } | |
531 | ||
9ebd3d82 DB |
532 | static int |
533 | lm75_probe(struct i2c_client *client, const struct i2c_device_id *id) | |
534 | { | |
d663ec49 | 535 | struct device *dev = &client->dev; |
9e37d3e2 | 536 | struct device *hwmon_dev; |
9ebd3d82 | 537 | struct lm75_data *data; |
90e2b545 | 538 | int status, err; |
e97a45f1 JMC |
539 | enum lm75_type kind; |
540 | ||
541 | if (client->dev.of_node) | |
542 | kind = (enum lm75_type)of_device_get_match_data(&client->dev); | |
543 | else | |
544 | kind = id->driver_data; | |
9ebd3d82 DB |
545 | |
546 | if (!i2c_check_functionality(client->adapter, | |
547 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) | |
548 | return -EIO; | |
549 | ||
d663ec49 | 550 | data = devm_kzalloc(dev, sizeof(struct lm75_data), GFP_KERNEL); |
9ebd3d82 DB |
551 | if (!data) |
552 | return -ENOMEM; | |
553 | ||
d663ec49 | 554 | data->client = client; |
dcb12653 | 555 | data->kind = kind; |
e65365fe GR |
556 | |
557 | data->regmap = devm_regmap_init_i2c(client, &lm75_regmap_config); | |
558 | if (IS_ERR(data->regmap)) | |
559 | return PTR_ERR(data->regmap); | |
9ebd3d82 DB |
560 | |
561 | /* Set to LM75 resolution (9 bits, 1/2 degree C) and range. | |
562 | * Then tweak to be more precise when appropriate. | |
563 | */ | |
9ebd3d82 | 564 | |
dcb12653 IPPS |
565 | data->params = &device_params[data->kind]; |
566 | ||
567 | /* Save default sample time and resolution*/ | |
568 | data->sample_time = data->params->default_sample_time; | |
569 | data->resolution = data->params->default_resolution; | |
570 | ||
571 | /* Cache original configuration */ | |
38aefb41 | 572 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
9ebd3d82 | 573 | if (status < 0) { |
d663ec49 | 574 | dev_dbg(dev, "Can't read config? %d\n", status); |
13ac7a01 | 575 | return status; |
9ebd3d82 DB |
576 | } |
577 | data->orig_conf = status; | |
58608cfe | 578 | data->current_conf = status; |
9ebd3d82 | 579 | |
58608cfe IPPS |
580 | err = lm75_write_config(data, data->params->set_mask, |
581 | data->params->clr_mask); | |
90e2b545 GR |
582 | if (err) |
583 | return err; | |
9ebd3d82 | 584 | |
58608cfe IPPS |
585 | err = devm_add_action_or_reset(dev, lm75_remove, data); |
586 | if (err) | |
587 | return err; | |
22e73183 | 588 | |
08b02433 GR |
589 | hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, |
590 | data, &lm75_chip_info, | |
591 | NULL); | |
9e37d3e2 GR |
592 | if (IS_ERR(hwmon_dev)) |
593 | return PTR_ERR(hwmon_dev); | |
9ebd3d82 | 594 | |
9e37d3e2 | 595 | dev_info(dev, "%s: sensor '%s'\n", dev_name(hwmon_dev), client->name); |
9ebd3d82 | 596 | |
9ebd3d82 DB |
597 | return 0; |
598 | } | |
599 | ||
600 | static const struct i2c_device_id lm75_ids[] = { | |
e96f9d89 | 601 | { "adt75", adt75, }, |
9ebd3d82 DB |
602 | { "ds1775", ds1775, }, |
603 | { "ds75", ds75, }, | |
3fbc81e3 | 604 | { "ds7505", ds7505, }, |
c98d6c65 | 605 | { "g751", g751, }, |
9ebd3d82 DB |
606 | { "lm75", lm75, }, |
607 | { "lm75a", lm75a, }, | |
799fc602 | 608 | { "lm75b", lm75b, }, |
9ebd3d82 DB |
609 | { "max6625", max6625, }, |
610 | { "max6626", max6626, }, | |
a54ca77a KY |
611 | { "max31725", max31725, }, |
612 | { "max31726", max31725, }, | |
9ebd3d82 | 613 | { "mcp980x", mcp980x, }, |
557c7ffa | 614 | { "pct2075", pct2075, }, |
9ebd3d82 | 615 | { "stds75", stds75, }, |
2e9a41bb | 616 | { "stlm75", stlm75, }, |
9ebd3d82 DB |
617 | { "tcn75", tcn75, }, |
618 | { "tmp100", tmp100, }, | |
619 | { "tmp101", tmp101, }, | |
6d034059 | 620 | { "tmp105", tmp105, }, |
c83959f8 | 621 | { "tmp112", tmp112, }, |
9ebd3d82 DB |
622 | { "tmp175", tmp175, }, |
623 | { "tmp275", tmp275, }, | |
624 | { "tmp75", tmp75, }, | |
39abe9d8 | 625 | { "tmp75b", tmp75b, }, |
9c32e815 | 626 | { "tmp75c", tmp75c, }, |
9ebd3d82 DB |
627 | { /* LIST END */ } |
628 | }; | |
629 | MODULE_DEVICE_TABLE(i2c, lm75_ids); | |
630 | ||
ffa83e78 | 631 | static const struct of_device_id __maybe_unused lm75_of_match[] = { |
e97a45f1 JMC |
632 | { |
633 | .compatible = "adi,adt75", | |
634 | .data = (void *)adt75 | |
635 | }, | |
636 | { | |
637 | .compatible = "dallas,ds1775", | |
638 | .data = (void *)ds1775 | |
639 | }, | |
640 | { | |
641 | .compatible = "dallas,ds75", | |
642 | .data = (void *)ds75 | |
643 | }, | |
644 | { | |
645 | .compatible = "dallas,ds7505", | |
646 | .data = (void *)ds7505 | |
647 | }, | |
648 | { | |
649 | .compatible = "gmt,g751", | |
650 | .data = (void *)g751 | |
651 | }, | |
652 | { | |
653 | .compatible = "national,lm75", | |
654 | .data = (void *)lm75 | |
655 | }, | |
656 | { | |
657 | .compatible = "national,lm75a", | |
658 | .data = (void *)lm75a | |
659 | }, | |
660 | { | |
661 | .compatible = "national,lm75b", | |
662 | .data = (void *)lm75b | |
663 | }, | |
664 | { | |
665 | .compatible = "maxim,max6625", | |
666 | .data = (void *)max6625 | |
667 | }, | |
668 | { | |
669 | .compatible = "maxim,max6626", | |
670 | .data = (void *)max6626 | |
671 | }, | |
a54ca77a KY |
672 | { |
673 | .compatible = "maxim,max31725", | |
674 | .data = (void *)max31725 | |
675 | }, | |
676 | { | |
677 | .compatible = "maxim,max31726", | |
678 | .data = (void *)max31725 | |
679 | }, | |
e97a45f1 JMC |
680 | { |
681 | .compatible = "maxim,mcp980x", | |
682 | .data = (void *)mcp980x | |
683 | }, | |
557c7ffa DM |
684 | { |
685 | .compatible = "nxp,pct2075", | |
686 | .data = (void *)pct2075 | |
687 | }, | |
e97a45f1 JMC |
688 | { |
689 | .compatible = "st,stds75", | |
690 | .data = (void *)stds75 | |
691 | }, | |
2e9a41bb JT |
692 | { |
693 | .compatible = "st,stlm75", | |
694 | .data = (void *)stlm75 | |
695 | }, | |
e97a45f1 JMC |
696 | { |
697 | .compatible = "microchip,tcn75", | |
698 | .data = (void *)tcn75 | |
699 | }, | |
700 | { | |
701 | .compatible = "ti,tmp100", | |
702 | .data = (void *)tmp100 | |
703 | }, | |
704 | { | |
705 | .compatible = "ti,tmp101", | |
706 | .data = (void *)tmp101 | |
707 | }, | |
708 | { | |
709 | .compatible = "ti,tmp105", | |
710 | .data = (void *)tmp105 | |
711 | }, | |
712 | { | |
713 | .compatible = "ti,tmp112", | |
714 | .data = (void *)tmp112 | |
715 | }, | |
716 | { | |
717 | .compatible = "ti,tmp175", | |
718 | .data = (void *)tmp175 | |
719 | }, | |
720 | { | |
721 | .compatible = "ti,tmp275", | |
722 | .data = (void *)tmp275 | |
723 | }, | |
724 | { | |
725 | .compatible = "ti,tmp75", | |
726 | .data = (void *)tmp75 | |
727 | }, | |
39abe9d8 IPPS |
728 | { |
729 | .compatible = "ti,tmp75b", | |
730 | .data = (void *)tmp75b | |
731 | }, | |
e97a45f1 JMC |
732 | { |
733 | .compatible = "ti,tmp75c", | |
734 | .data = (void *)tmp75c | |
735 | }, | |
736 | { }, | |
737 | }; | |
738 | MODULE_DEVICE_TABLE(of, lm75_of_match); | |
739 | ||
05e82fe4 LS |
740 | #define LM75A_ID 0xA1 |
741 | ||
8ff69eeb | 742 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
310ec792 | 743 | static int lm75_detect(struct i2c_client *new_client, |
8ff69eeb | 744 | struct i2c_board_info *info) |
1da177e4 | 745 | { |
8ff69eeb | 746 | struct i2c_adapter *adapter = new_client->adapter; |
1da177e4 | 747 | int i; |
e76f67b5 | 748 | int conf, hyst, os; |
05e82fe4 | 749 | bool is_lm75a = 0; |
1da177e4 | 750 | |
1da177e4 LT |
751 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
752 | I2C_FUNC_SMBUS_WORD_DATA)) | |
8ff69eeb | 753 | return -ENODEV; |
1da177e4 | 754 | |
426343ef JD |
755 | /* |
756 | * Now, we do the remaining detection. There is no identification- | |
757 | * dedicated register so we have to rely on several tricks: | |
758 | * unused bits, registers cycling over 8-address boundaries, | |
759 | * addresses 0x04-0x07 returning the last read value. | |
760 | * The cycling+unused addresses combination is not tested, | |
761 | * since it would significantly slow the detection down and would | |
762 | * hardly add any value. | |
763 | * | |
764 | * The National Semiconductor LM75A is different than earlier | |
765 | * LM75s. It has an ID byte of 0xaX (where X is the chip | |
766 | * revision, with 1 being the only revision in existence) in | |
767 | * register 7, and unused registers return 0xff rather than the | |
768 | * last read value. | |
769 | * | |
770 | * Note that this function only detects the original National | |
771 | * Semiconductor LM75 and the LM75A. Clones from other vendors | |
772 | * aren't detected, on purpose, because they are typically never | |
773 | * found on PC hardware. They are found on embedded designs where | |
774 | * they can be instantiated explicitly so detection is not needed. | |
775 | * The absence of identification registers on all these clones | |
776 | * would make their exhaustive detection very difficult and weak, | |
777 | * and odds are that the driver would bind to unsupported devices. | |
778 | */ | |
1da177e4 | 779 | |
e76f67b5 | 780 | /* Unused bits */ |
52df6440 | 781 | conf = i2c_smbus_read_byte_data(new_client, 1); |
e76f67b5 JD |
782 | if (conf & 0xe0) |
783 | return -ENODEV; | |
05e82fe4 LS |
784 | |
785 | /* First check for LM75A */ | |
786 | if (i2c_smbus_read_byte_data(new_client, 7) == LM75A_ID) { | |
787 | /* LM75A returns 0xff on unused registers so | |
788 | just to be sure we check for that too. */ | |
789 | if (i2c_smbus_read_byte_data(new_client, 4) != 0xff | |
790 | || i2c_smbus_read_byte_data(new_client, 5) != 0xff | |
791 | || i2c_smbus_read_byte_data(new_client, 6) != 0xff) | |
792 | return -ENODEV; | |
793 | is_lm75a = 1; | |
e76f67b5 JD |
794 | hyst = i2c_smbus_read_byte_data(new_client, 2); |
795 | os = i2c_smbus_read_byte_data(new_client, 3); | |
05e82fe4 LS |
796 | } else { /* Traditional style LM75 detection */ |
797 | /* Unused addresses */ | |
e76f67b5 JD |
798 | hyst = i2c_smbus_read_byte_data(new_client, 2); |
799 | if (i2c_smbus_read_byte_data(new_client, 4) != hyst | |
800 | || i2c_smbus_read_byte_data(new_client, 5) != hyst | |
801 | || i2c_smbus_read_byte_data(new_client, 6) != hyst | |
802 | || i2c_smbus_read_byte_data(new_client, 7) != hyst) | |
05e82fe4 | 803 | return -ENODEV; |
e76f67b5 JD |
804 | os = i2c_smbus_read_byte_data(new_client, 3); |
805 | if (i2c_smbus_read_byte_data(new_client, 4) != os | |
806 | || i2c_smbus_read_byte_data(new_client, 5) != os | |
807 | || i2c_smbus_read_byte_data(new_client, 6) != os | |
808 | || i2c_smbus_read_byte_data(new_client, 7) != os) | |
05e82fe4 LS |
809 | return -ENODEV; |
810 | } | |
4ad40cc5 GR |
811 | /* |
812 | * It is very unlikely that this is a LM75 if both | |
813 | * hysteresis and temperature limit registers are 0. | |
814 | */ | |
815 | if (hyst == 0 && os == 0) | |
816 | return -ENODEV; | |
1da177e4 | 817 | |
52df6440 | 818 | /* Addresses cycling */ |
e76f67b5 | 819 | for (i = 8; i <= 248; i += 40) { |
52df6440 | 820 | if (i2c_smbus_read_byte_data(new_client, i + 1) != conf |
e76f67b5 JD |
821 | || i2c_smbus_read_byte_data(new_client, i + 2) != hyst |
822 | || i2c_smbus_read_byte_data(new_client, i + 3) != os) | |
52df6440 | 823 | return -ENODEV; |
05e82fe4 LS |
824 | if (is_lm75a && i2c_smbus_read_byte_data(new_client, i + 7) |
825 | != LM75A_ID) | |
826 | return -ENODEV; | |
1da177e4 LT |
827 | } |
828 | ||
05e82fe4 | 829 | strlcpy(info->type, is_lm75a ? "lm75a" : "lm75", I2C_NAME_SIZE); |
c1685f61 | 830 | |
1da177e4 | 831 | return 0; |
01a52397 DB |
832 | } |
833 | ||
9914518e SD |
834 | #ifdef CONFIG_PM |
835 | static int lm75_suspend(struct device *dev) | |
836 | { | |
837 | int status; | |
838 | struct i2c_client *client = to_i2c_client(dev); | |
38aefb41 | 839 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
9914518e SD |
840 | if (status < 0) { |
841 | dev_dbg(&client->dev, "Can't read config? %d\n", status); | |
842 | return status; | |
843 | } | |
844 | status = status | LM75_SHUTDOWN; | |
38aefb41 | 845 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, status); |
9914518e SD |
846 | return 0; |
847 | } | |
848 | ||
849 | static int lm75_resume(struct device *dev) | |
850 | { | |
851 | int status; | |
852 | struct i2c_client *client = to_i2c_client(dev); | |
38aefb41 | 853 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
9914518e SD |
854 | if (status < 0) { |
855 | dev_dbg(&client->dev, "Can't read config? %d\n", status); | |
856 | return status; | |
857 | } | |
858 | status = status & ~LM75_SHUTDOWN; | |
38aefb41 | 859 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, status); |
9914518e SD |
860 | return 0; |
861 | } | |
862 | ||
863 | static const struct dev_pm_ops lm75_dev_pm_ops = { | |
864 | .suspend = lm75_suspend, | |
865 | .resume = lm75_resume, | |
866 | }; | |
867 | #define LM75_DEV_PM_OPS (&lm75_dev_pm_ops) | |
868 | #else | |
869 | #define LM75_DEV_PM_OPS NULL | |
870 | #endif /* CONFIG_PM */ | |
871 | ||
8ff69eeb JD |
872 | static struct i2c_driver lm75_driver = { |
873 | .class = I2C_CLASS_HWMON, | |
01a52397 | 874 | .driver = { |
8ff69eeb | 875 | .name = "lm75", |
e97a45f1 | 876 | .of_match_table = of_match_ptr(lm75_of_match), |
9914518e | 877 | .pm = LM75_DEV_PM_OPS, |
01a52397 | 878 | }, |
8ff69eeb | 879 | .probe = lm75_probe, |
8ff69eeb JD |
880 | .id_table = lm75_ids, |
881 | .detect = lm75_detect, | |
c3813d6a | 882 | .address_list = normal_i2c, |
01a52397 DB |
883 | }; |
884 | ||
f0967eea | 885 | module_i2c_driver(lm75_driver); |
1da177e4 LT |
886 | |
887 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"); | |
888 | MODULE_DESCRIPTION("LM75 driver"); | |
889 | MODULE_LICENSE("GPL"); |