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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 | |
d7a85cde | 98 | #define PCT2075_REG_IDLE 0x04 |
1da177e4 LT |
99 | |
100 | /* Each client has this additional data */ | |
101 | struct lm75_data { | |
dcb12653 IPPS |
102 | struct i2c_client *client; |
103 | struct regmap *regmap; | |
104 | u8 orig_conf; | |
105 | u8 current_conf; | |
106 | u8 resolution; /* In bits, 9 to 16 */ | |
107 | unsigned int sample_time; /* In ms */ | |
108 | enum lm75_type kind; | |
109 | const struct lm75_params *params; | |
1da177e4 LT |
110 | }; |
111 | ||
01a52397 | 112 | /*-----------------------------------------------------------------------*/ |
7db0db3f GR |
113 | |
114 | static const u8 lm75_sample_set_masks[] = { 0 << 5, 1 << 5, 2 << 5, 3 << 5 }; | |
115 | ||
116 | #define LM75_SAMPLE_CLEAR_MASK (3 << 5) | |
117 | ||
dcb12653 IPPS |
118 | /* The structure below stores the configuration values of the supported devices. |
119 | * In case of being supported multiple configurations, the default one must | |
120 | * always be the first element of the array | |
121 | */ | |
122 | static const struct lm75_params device_params[] = { | |
123 | [adt75] = { | |
124 | .clr_mask = 1 << 5, /* not one-shot mode */ | |
125 | .default_resolution = 12, | |
35cd1804 | 126 | .default_sample_time = MSEC_PER_SEC / 10, |
dcb12653 IPPS |
127 | }, |
128 | [ds1775] = { | |
129 | .clr_mask = 3 << 5, | |
130 | .set_mask = 2 << 5, /* 11-bit mode */ | |
131 | .default_resolution = 11, | |
35cd1804 | 132 | .default_sample_time = 500, |
7db0db3f | 133 | .num_sample_times = 4, |
35cd1804 | 134 | .sample_times = (unsigned int []){ 125, 250, 500, 1000 }, |
7db0db3f | 135 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
dcb12653 IPPS |
136 | }, |
137 | [ds75] = { | |
138 | .clr_mask = 3 << 5, | |
139 | .set_mask = 2 << 5, /* 11-bit mode */ | |
140 | .default_resolution = 11, | |
7db0db3f GR |
141 | .default_sample_time = 600, |
142 | .num_sample_times = 4, | |
143 | .sample_times = (unsigned int []){ 150, 300, 600, 1200 }, | |
144 | .resolutions = (u8 []) {9, 10, 11, 12 }, | |
dcb12653 IPPS |
145 | }, |
146 | [stds75] = { | |
147 | .clr_mask = 3 << 5, | |
148 | .set_mask = 2 << 5, /* 11-bit mode */ | |
149 | .default_resolution = 11, | |
7db0db3f GR |
150 | .default_sample_time = 600, |
151 | .num_sample_times = 4, | |
152 | .sample_times = (unsigned int []){ 150, 300, 600, 1200 }, | |
153 | .resolutions = (u8 []) {9, 10, 11, 12 }, | |
dcb12653 IPPS |
154 | }, |
155 | [stlm75] = { | |
156 | .default_resolution = 9, | |
35cd1804 | 157 | .default_sample_time = MSEC_PER_SEC / 6, |
dcb12653 IPPS |
158 | }, |
159 | [ds7505] = { | |
160 | .set_mask = 3 << 5, /* 12-bit mode*/ | |
161 | .default_resolution = 12, | |
7db0db3f GR |
162 | .default_sample_time = 200, |
163 | .num_sample_times = 4, | |
164 | .sample_times = (unsigned int []){ 25, 50, 100, 200 }, | |
165 | .resolutions = (u8 []) {9, 10, 11, 12 }, | |
dcb12653 IPPS |
166 | }, |
167 | [g751] = { | |
168 | .default_resolution = 9, | |
35cd1804 | 169 | .default_sample_time = MSEC_PER_SEC / 10, |
dcb12653 IPPS |
170 | }, |
171 | [lm75] = { | |
172 | .default_resolution = 9, | |
35cd1804 | 173 | .default_sample_time = MSEC_PER_SEC / 10, |
dcb12653 IPPS |
174 | }, |
175 | [lm75a] = { | |
176 | .default_resolution = 9, | |
35cd1804 | 177 | .default_sample_time = MSEC_PER_SEC / 10, |
dcb12653 IPPS |
178 | }, |
179 | [lm75b] = { | |
180 | .default_resolution = 11, | |
35cd1804 | 181 | .default_sample_time = MSEC_PER_SEC / 10, |
dcb12653 IPPS |
182 | }, |
183 | [max6625] = { | |
184 | .default_resolution = 9, | |
35cd1804 | 185 | .default_sample_time = MSEC_PER_SEC / 7, |
dcb12653 IPPS |
186 | }, |
187 | [max6626] = { | |
188 | .default_resolution = 12, | |
35cd1804 | 189 | .default_sample_time = MSEC_PER_SEC / 7, |
dcb12653 IPPS |
190 | .resolution_limits = 9, |
191 | }, | |
192 | [max31725] = { | |
193 | .default_resolution = 16, | |
35cd1804 | 194 | .default_sample_time = MSEC_PER_SEC / 20, |
dcb12653 IPPS |
195 | }, |
196 | [tcn75] = { | |
197 | .default_resolution = 9, | |
35cd1804 | 198 | .default_sample_time = MSEC_PER_SEC / 18, |
dcb12653 IPPS |
199 | }, |
200 | [pct2075] = { | |
201 | .default_resolution = 11, | |
202 | .default_sample_time = MSEC_PER_SEC / 10, | |
d7a85cde GR |
203 | .num_sample_times = 31, |
204 | .sample_times = (unsigned int []){ 100, 200, 300, 400, 500, 600, | |
205 | 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, | |
206 | 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, | |
207 | 2800, 2900, 3000, 3100 }, | |
dcb12653 IPPS |
208 | }, |
209 | [mcp980x] = { | |
210 | .set_mask = 3 << 5, /* 12-bit mode */ | |
211 | .clr_mask = 1 << 7, /* not one-shot mode */ | |
212 | .default_resolution = 12, | |
213 | .resolution_limits = 9, | |
7db0db3f GR |
214 | .default_sample_time = 240, |
215 | .num_sample_times = 4, | |
35cd1804 | 216 | .sample_times = (unsigned int []){ 30, 60, 120, 240 }, |
7db0db3f | 217 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
dcb12653 IPPS |
218 | }, |
219 | [tmp100] = { | |
220 | .set_mask = 3 << 5, /* 12-bit mode */ | |
221 | .clr_mask = 1 << 7, /* not one-shot mode */ | |
222 | .default_resolution = 12, | |
7db0db3f GR |
223 | .default_sample_time = 320, |
224 | .num_sample_times = 4, | |
35cd1804 | 225 | .sample_times = (unsigned int []){ 40, 80, 160, 320 }, |
7db0db3f | 226 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
dcb12653 IPPS |
227 | }, |
228 | [tmp101] = { | |
229 | .set_mask = 3 << 5, /* 12-bit mode */ | |
230 | .clr_mask = 1 << 7, /* not one-shot mode */ | |
231 | .default_resolution = 12, | |
7db0db3f GR |
232 | .default_sample_time = 320, |
233 | .num_sample_times = 4, | |
35cd1804 | 234 | .sample_times = (unsigned int []){ 40, 80, 160, 320 }, |
7db0db3f | 235 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
dcb12653 | 236 | }, |
7db0db3f | 237 | [tmp105] = { |
dcb12653 | 238 | .set_mask = 3 << 5, /* 12-bit mode */ |
7db0db3f | 239 | .clr_mask = 1 << 7, /* not one-shot mode*/ |
dcb12653 | 240 | .default_resolution = 12, |
7db0db3f GR |
241 | .default_sample_time = 220, |
242 | .num_sample_times = 4, | |
35cd1804 | 243 | .sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
7db0db3f | 244 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
dcb12653 | 245 | }, |
7db0db3f | 246 | [tmp112] = { |
35cd1804 | 247 | .set_mask = 3 << 5, /* 8 samples / second */ |
7db0db3f | 248 | .clr_mask = 1 << 7, /* no one-shot mode*/ |
dcb12653 | 249 | .default_resolution = 12, |
35cd1804 | 250 | .default_sample_time = 125, |
cee04a01 GR |
251 | .num_sample_times = 4, |
252 | .sample_times = (unsigned int []){ 125, 250, 1000, 4000 }, | |
dcb12653 IPPS |
253 | }, |
254 | [tmp175] = { | |
255 | .set_mask = 3 << 5, /* 12-bit mode */ | |
256 | .clr_mask = 1 << 7, /* not one-shot mode*/ | |
257 | .default_resolution = 12, | |
7db0db3f GR |
258 | .default_sample_time = 220, |
259 | .num_sample_times = 4, | |
35cd1804 | 260 | .sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
7db0db3f | 261 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
dcb12653 IPPS |
262 | }, |
263 | [tmp275] = { | |
264 | .set_mask = 3 << 5, /* 12-bit mode */ | |
265 | .clr_mask = 1 << 7, /* not one-shot mode*/ | |
266 | .default_resolution = 12, | |
7db0db3f GR |
267 | .default_sample_time = 220, |
268 | .num_sample_times = 4, | |
35cd1804 | 269 | .sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
7db0db3f | 270 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
dcb12653 IPPS |
271 | }, |
272 | [tmp75] = { | |
273 | .set_mask = 3 << 5, /* 12-bit mode */ | |
274 | .clr_mask = 1 << 7, /* not one-shot mode*/ | |
275 | .default_resolution = 12, | |
7db0db3f GR |
276 | .default_sample_time = 220, |
277 | .num_sample_times = 4, | |
35cd1804 | 278 | .sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
7db0db3f | 279 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
dcb12653 IPPS |
280 | }, |
281 | [tmp75b] = { /* not one-shot mode, Conversion rate 37Hz */ | |
282 | .clr_mask = 1 << 7 | 3 << 5, | |
283 | .default_resolution = 12, | |
284 | .default_sample_time = MSEC_PER_SEC / 37, | |
7f1a300f IPPS |
285 | .sample_times = (unsigned int []){ MSEC_PER_SEC / 37, |
286 | MSEC_PER_SEC / 18, | |
287 | MSEC_PER_SEC / 9, MSEC_PER_SEC / 4 }, | |
288 | .num_sample_times = 4, | |
dcb12653 IPPS |
289 | }, |
290 | [tmp75c] = { | |
291 | .clr_mask = 1 << 5, /*not one-shot mode*/ | |
292 | .default_resolution = 12, | |
35cd1804 | 293 | .default_sample_time = MSEC_PER_SEC / 12, |
dcb12653 IPPS |
294 | } |
295 | }; | |
01a52397 | 296 | |
22e73183 EV |
297 | static inline long lm75_reg_to_mc(s16 temp, u8 resolution) |
298 | { | |
299 | return ((temp >> (16 - resolution)) * 1000) >> (resolution - 8); | |
300 | } | |
301 | ||
58608cfe IPPS |
302 | static int lm75_write_config(struct lm75_data *data, u8 set_mask, |
303 | u8 clr_mask) | |
304 | { | |
305 | u8 value; | |
306 | ||
307 | clr_mask |= LM75_SHUTDOWN; | |
308 | value = data->current_conf & ~clr_mask; | |
309 | value |= set_mask; | |
310 | ||
311 | if (data->current_conf != value) { | |
312 | s32 err; | |
313 | ||
314 | err = i2c_smbus_write_byte_data(data->client, LM75_REG_CONF, | |
315 | value); | |
316 | if (err) | |
317 | return err; | |
318 | data->current_conf = value; | |
319 | } | |
320 | return 0; | |
321 | } | |
322 | ||
08b02433 GR |
323 | static int lm75_read(struct device *dev, enum hwmon_sensor_types type, |
324 | u32 attr, int channel, long *val) | |
22e73183 | 325 | { |
e65365fe | 326 | struct lm75_data *data = dev_get_drvdata(dev); |
08b02433 GR |
327 | unsigned int regval; |
328 | int err, reg; | |
329 | ||
330 | switch (type) { | |
331 | case hwmon_chip: | |
332 | switch (attr) { | |
333 | case hwmon_chip_update_interval: | |
334 | *val = data->sample_time; | |
ccffe776 | 335 | break; |
08b02433 GR |
336 | default: |
337 | return -EINVAL; | |
338 | } | |
339 | break; | |
340 | case hwmon_temp: | |
341 | switch (attr) { | |
342 | case hwmon_temp_input: | |
343 | reg = LM75_REG_TEMP; | |
344 | break; | |
345 | case hwmon_temp_max: | |
346 | reg = LM75_REG_MAX; | |
347 | break; | |
348 | case hwmon_temp_max_hyst: | |
349 | reg = LM75_REG_HYST; | |
350 | break; | |
351 | default: | |
352 | return -EINVAL; | |
353 | } | |
354 | err = regmap_read(data->regmap, reg, ®val); | |
355 | if (err < 0) | |
356 | return err; | |
357 | ||
358 | *val = lm75_reg_to_mc(regval, data->resolution); | |
359 | break; | |
360 | default: | |
361 | return -EINVAL; | |
362 | } | |
22e73183 EV |
363 | return 0; |
364 | } | |
365 | ||
4b5be3c1 | 366 | static int lm75_write_temp(struct device *dev, u32 attr, long temp) |
9ca8e40c | 367 | { |
e65365fe | 368 | struct lm75_data *data = dev_get_drvdata(dev); |
87d0621a | 369 | u8 resolution; |
08b02433 GR |
370 | int reg; |
371 | ||
08b02433 GR |
372 | switch (attr) { |
373 | case hwmon_temp_max: | |
374 | reg = LM75_REG_MAX; | |
375 | break; | |
376 | case hwmon_temp_max_hyst: | |
377 | reg = LM75_REG_HYST; | |
378 | break; | |
379 | default: | |
380 | return -EINVAL; | |
381 | } | |
9ca8e40c | 382 | |
87d0621a JD |
383 | /* |
384 | * Resolution of limit registers is assumed to be the same as the | |
385 | * temperature input register resolution unless given explicitly. | |
386 | */ | |
dcb12653 IPPS |
387 | if (data->params->resolution_limits) |
388 | resolution = data->params->resolution_limits; | |
87d0621a JD |
389 | else |
390 | resolution = data->resolution; | |
391 | ||
87d0621a | 392 | temp = clamp_val(temp, LM75_TEMP_MIN, LM75_TEMP_MAX); |
e65365fe GR |
393 | temp = DIV_ROUND_CLOSEST(temp << (resolution - 8), |
394 | 1000) << (16 - resolution); | |
e65365fe | 395 | |
7d82fcc9 | 396 | return regmap_write(data->regmap, reg, (u16)temp); |
1da177e4 | 397 | } |
1da177e4 | 398 | |
040b106f | 399 | static int lm75_update_interval(struct device *dev, long val) |
4b5be3c1 IPPS |
400 | { |
401 | struct lm75_data *data = dev_get_drvdata(dev); | |
cee04a01 | 402 | unsigned int reg; |
4b5be3c1 IPPS |
403 | u8 index; |
404 | s32 err; | |
405 | ||
040b106f GR |
406 | index = find_closest(val, data->params->sample_times, |
407 | (int)data->params->num_sample_times); | |
4b5be3c1 | 408 | |
cee04a01 GR |
409 | switch (data->kind) { |
410 | default: | |
411 | err = lm75_write_config(data, lm75_sample_set_masks[index], | |
412 | LM75_SAMPLE_CLEAR_MASK); | |
413 | if (err) | |
414 | return err; | |
040b106f | 415 | |
cee04a01 GR |
416 | data->sample_time = data->params->sample_times[index]; |
417 | if (data->params->resolutions) | |
418 | data->resolution = data->params->resolutions[index]; | |
419 | break; | |
420 | case tmp112: | |
421 | err = regmap_read(data->regmap, LM75_REG_CONF, ®); | |
422 | if (err < 0) | |
423 | return err; | |
424 | reg &= ~0x00c0; | |
425 | reg |= (3 - index) << 6; | |
426 | err = regmap_write(data->regmap, LM75_REG_CONF, reg); | |
427 | if (err < 0) | |
428 | return err; | |
429 | data->sample_time = data->params->sample_times[index]; | |
430 | break; | |
d7a85cde GR |
431 | case pct2075: |
432 | err = i2c_smbus_write_byte_data(data->client, PCT2075_REG_IDLE, | |
433 | index + 1); | |
434 | if (err) | |
435 | return err; | |
436 | data->sample_time = data->params->sample_times[index]; | |
437 | break; | |
cee04a01 | 438 | } |
040b106f GR |
439 | return 0; |
440 | } | |
441 | ||
442 | static int lm75_write_chip(struct device *dev, u32 attr, long val) | |
443 | { | |
444 | switch (attr) { | |
445 | case hwmon_chip_update_interval: | |
446 | return lm75_update_interval(dev, val); | |
4b5be3c1 IPPS |
447 | default: |
448 | return -EINVAL; | |
449 | } | |
450 | return 0; | |
451 | } | |
452 | ||
453 | static int lm75_write(struct device *dev, enum hwmon_sensor_types type, | |
454 | u32 attr, int channel, long val) | |
455 | { | |
456 | switch (type) { | |
457 | case hwmon_chip: | |
458 | return lm75_write_chip(dev, attr, val); | |
459 | case hwmon_temp: | |
460 | return lm75_write_temp(dev, attr, val); | |
461 | default: | |
462 | return -EINVAL; | |
463 | } | |
464 | return 0; | |
465 | } | |
466 | ||
08b02433 GR |
467 | static umode_t lm75_is_visible(const void *data, enum hwmon_sensor_types type, |
468 | u32 attr, int channel) | |
5f7e5e29 | 469 | { |
4b5be3c1 IPPS |
470 | const struct lm75_data *config_data = data; |
471 | ||
08b02433 GR |
472 | switch (type) { |
473 | case hwmon_chip: | |
474 | switch (attr) { | |
475 | case hwmon_chip_update_interval: | |
4b5be3c1 IPPS |
476 | if (config_data->params->num_sample_times > 1) |
477 | return 0644; | |
e6ab6e0e | 478 | return 0444; |
08b02433 GR |
479 | } |
480 | break; | |
481 | case hwmon_temp: | |
482 | switch (attr) { | |
483 | case hwmon_temp_input: | |
e6ab6e0e | 484 | return 0444; |
08b02433 GR |
485 | case hwmon_temp_max: |
486 | case hwmon_temp_max_hyst: | |
e6ab6e0e | 487 | return 0644; |
08b02433 GR |
488 | } |
489 | break; | |
490 | default: | |
491 | break; | |
492 | } | |
493 | return 0; | |
5f7e5e29 GR |
494 | } |
495 | ||
08b02433 | 496 | static const struct hwmon_channel_info *lm75_info[] = { |
e4f6fed1 GR |
497 | HWMON_CHANNEL_INFO(chip, |
498 | HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL), | |
499 | HWMON_CHANNEL_INFO(temp, | |
500 | HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST), | |
08b02433 GR |
501 | NULL |
502 | }; | |
503 | ||
504 | static const struct hwmon_ops lm75_hwmon_ops = { | |
505 | .is_visible = lm75_is_visible, | |
506 | .read = lm75_read, | |
507 | .write = lm75_write, | |
508 | }; | |
509 | ||
510 | static const struct hwmon_chip_info lm75_chip_info = { | |
511 | .ops = &lm75_hwmon_ops, | |
512 | .info = lm75_info, | |
513 | }; | |
9ebd3d82 | 514 | |
e65365fe GR |
515 | static bool lm75_is_writeable_reg(struct device *dev, unsigned int reg) |
516 | { | |
517 | return reg != LM75_REG_TEMP; | |
518 | } | |
519 | ||
520 | static bool lm75_is_volatile_reg(struct device *dev, unsigned int reg) | |
521 | { | |
cee04a01 | 522 | return reg == LM75_REG_TEMP || reg == LM75_REG_CONF; |
e65365fe GR |
523 | } |
524 | ||
525 | static const struct regmap_config lm75_regmap_config = { | |
526 | .reg_bits = 8, | |
527 | .val_bits = 16, | |
d7a85cde | 528 | .max_register = PCT2075_REG_IDLE, |
e65365fe GR |
529 | .writeable_reg = lm75_is_writeable_reg, |
530 | .volatile_reg = lm75_is_volatile_reg, | |
531 | .val_format_endian = REGMAP_ENDIAN_BIG, | |
532 | .cache_type = REGCACHE_RBTREE, | |
1c96a2f6 DF |
533 | .use_single_read = true, |
534 | .use_single_write = true, | |
e65365fe GR |
535 | }; |
536 | ||
9e37d3e2 GR |
537 | static void lm75_remove(void *data) |
538 | { | |
539 | struct lm75_data *lm75 = data; | |
540 | struct i2c_client *client = lm75->client; | |
541 | ||
542 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, lm75->orig_conf); | |
543 | } | |
544 | ||
67487038 SK |
545 | static const struct i2c_device_id lm75_ids[]; |
546 | ||
547 | static int lm75_probe(struct i2c_client *client) | |
9ebd3d82 | 548 | { |
d663ec49 | 549 | struct device *dev = &client->dev; |
9e37d3e2 | 550 | struct device *hwmon_dev; |
9ebd3d82 | 551 | struct lm75_data *data; |
90e2b545 | 552 | int status, err; |
e97a45f1 JMC |
553 | enum lm75_type kind; |
554 | ||
555 | if (client->dev.of_node) | |
556 | kind = (enum lm75_type)of_device_get_match_data(&client->dev); | |
557 | else | |
67487038 | 558 | kind = i2c_match_id(lm75_ids, client)->driver_data; |
9ebd3d82 DB |
559 | |
560 | if (!i2c_check_functionality(client->adapter, | |
561 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) | |
562 | return -EIO; | |
563 | ||
d663ec49 | 564 | data = devm_kzalloc(dev, sizeof(struct lm75_data), GFP_KERNEL); |
9ebd3d82 DB |
565 | if (!data) |
566 | return -ENOMEM; | |
567 | ||
d663ec49 | 568 | data->client = client; |
dcb12653 | 569 | data->kind = kind; |
e65365fe GR |
570 | |
571 | data->regmap = devm_regmap_init_i2c(client, &lm75_regmap_config); | |
572 | if (IS_ERR(data->regmap)) | |
573 | return PTR_ERR(data->regmap); | |
9ebd3d82 DB |
574 | |
575 | /* Set to LM75 resolution (9 bits, 1/2 degree C) and range. | |
576 | * Then tweak to be more precise when appropriate. | |
577 | */ | |
9ebd3d82 | 578 | |
dcb12653 IPPS |
579 | data->params = &device_params[data->kind]; |
580 | ||
581 | /* Save default sample time and resolution*/ | |
582 | data->sample_time = data->params->default_sample_time; | |
583 | data->resolution = data->params->default_resolution; | |
584 | ||
585 | /* Cache original configuration */ | |
38aefb41 | 586 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
9ebd3d82 | 587 | if (status < 0) { |
d663ec49 | 588 | dev_dbg(dev, "Can't read config? %d\n", status); |
13ac7a01 | 589 | return status; |
9ebd3d82 DB |
590 | } |
591 | data->orig_conf = status; | |
58608cfe | 592 | data->current_conf = status; |
9ebd3d82 | 593 | |
58608cfe IPPS |
594 | err = lm75_write_config(data, data->params->set_mask, |
595 | data->params->clr_mask); | |
90e2b545 GR |
596 | if (err) |
597 | return err; | |
9ebd3d82 | 598 | |
58608cfe IPPS |
599 | err = devm_add_action_or_reset(dev, lm75_remove, data); |
600 | if (err) | |
601 | return err; | |
22e73183 | 602 | |
08b02433 GR |
603 | hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, |
604 | data, &lm75_chip_info, | |
605 | NULL); | |
9e37d3e2 GR |
606 | if (IS_ERR(hwmon_dev)) |
607 | return PTR_ERR(hwmon_dev); | |
9ebd3d82 | 608 | |
9e37d3e2 | 609 | dev_info(dev, "%s: sensor '%s'\n", dev_name(hwmon_dev), client->name); |
9ebd3d82 | 610 | |
9ebd3d82 DB |
611 | return 0; |
612 | } | |
613 | ||
614 | static const struct i2c_device_id lm75_ids[] = { | |
e96f9d89 | 615 | { "adt75", adt75, }, |
9ebd3d82 DB |
616 | { "ds1775", ds1775, }, |
617 | { "ds75", ds75, }, | |
3fbc81e3 | 618 | { "ds7505", ds7505, }, |
c98d6c65 | 619 | { "g751", g751, }, |
9ebd3d82 DB |
620 | { "lm75", lm75, }, |
621 | { "lm75a", lm75a, }, | |
799fc602 | 622 | { "lm75b", lm75b, }, |
9ebd3d82 DB |
623 | { "max6625", max6625, }, |
624 | { "max6626", max6626, }, | |
a54ca77a KY |
625 | { "max31725", max31725, }, |
626 | { "max31726", max31725, }, | |
9ebd3d82 | 627 | { "mcp980x", mcp980x, }, |
557c7ffa | 628 | { "pct2075", pct2075, }, |
9ebd3d82 | 629 | { "stds75", stds75, }, |
2e9a41bb | 630 | { "stlm75", stlm75, }, |
9ebd3d82 DB |
631 | { "tcn75", tcn75, }, |
632 | { "tmp100", tmp100, }, | |
633 | { "tmp101", tmp101, }, | |
6d034059 | 634 | { "tmp105", tmp105, }, |
c83959f8 | 635 | { "tmp112", tmp112, }, |
9ebd3d82 DB |
636 | { "tmp175", tmp175, }, |
637 | { "tmp275", tmp275, }, | |
638 | { "tmp75", tmp75, }, | |
39abe9d8 | 639 | { "tmp75b", tmp75b, }, |
9c32e815 | 640 | { "tmp75c", tmp75c, }, |
9ebd3d82 DB |
641 | { /* LIST END */ } |
642 | }; | |
643 | MODULE_DEVICE_TABLE(i2c, lm75_ids); | |
644 | ||
ffa83e78 | 645 | static const struct of_device_id __maybe_unused lm75_of_match[] = { |
e97a45f1 JMC |
646 | { |
647 | .compatible = "adi,adt75", | |
648 | .data = (void *)adt75 | |
649 | }, | |
650 | { | |
651 | .compatible = "dallas,ds1775", | |
652 | .data = (void *)ds1775 | |
653 | }, | |
654 | { | |
655 | .compatible = "dallas,ds75", | |
656 | .data = (void *)ds75 | |
657 | }, | |
658 | { | |
659 | .compatible = "dallas,ds7505", | |
660 | .data = (void *)ds7505 | |
661 | }, | |
662 | { | |
663 | .compatible = "gmt,g751", | |
664 | .data = (void *)g751 | |
665 | }, | |
666 | { | |
667 | .compatible = "national,lm75", | |
668 | .data = (void *)lm75 | |
669 | }, | |
670 | { | |
671 | .compatible = "national,lm75a", | |
672 | .data = (void *)lm75a | |
673 | }, | |
674 | { | |
675 | .compatible = "national,lm75b", | |
676 | .data = (void *)lm75b | |
677 | }, | |
678 | { | |
679 | .compatible = "maxim,max6625", | |
680 | .data = (void *)max6625 | |
681 | }, | |
682 | { | |
683 | .compatible = "maxim,max6626", | |
684 | .data = (void *)max6626 | |
685 | }, | |
a54ca77a KY |
686 | { |
687 | .compatible = "maxim,max31725", | |
688 | .data = (void *)max31725 | |
689 | }, | |
690 | { | |
691 | .compatible = "maxim,max31726", | |
692 | .data = (void *)max31725 | |
693 | }, | |
e97a45f1 JMC |
694 | { |
695 | .compatible = "maxim,mcp980x", | |
696 | .data = (void *)mcp980x | |
697 | }, | |
557c7ffa DM |
698 | { |
699 | .compatible = "nxp,pct2075", | |
700 | .data = (void *)pct2075 | |
701 | }, | |
e97a45f1 JMC |
702 | { |
703 | .compatible = "st,stds75", | |
704 | .data = (void *)stds75 | |
705 | }, | |
2e9a41bb JT |
706 | { |
707 | .compatible = "st,stlm75", | |
708 | .data = (void *)stlm75 | |
709 | }, | |
e97a45f1 JMC |
710 | { |
711 | .compatible = "microchip,tcn75", | |
712 | .data = (void *)tcn75 | |
713 | }, | |
714 | { | |
715 | .compatible = "ti,tmp100", | |
716 | .data = (void *)tmp100 | |
717 | }, | |
718 | { | |
719 | .compatible = "ti,tmp101", | |
720 | .data = (void *)tmp101 | |
721 | }, | |
722 | { | |
723 | .compatible = "ti,tmp105", | |
724 | .data = (void *)tmp105 | |
725 | }, | |
726 | { | |
727 | .compatible = "ti,tmp112", | |
728 | .data = (void *)tmp112 | |
729 | }, | |
730 | { | |
731 | .compatible = "ti,tmp175", | |
732 | .data = (void *)tmp175 | |
733 | }, | |
734 | { | |
735 | .compatible = "ti,tmp275", | |
736 | .data = (void *)tmp275 | |
737 | }, | |
738 | { | |
739 | .compatible = "ti,tmp75", | |
740 | .data = (void *)tmp75 | |
741 | }, | |
39abe9d8 IPPS |
742 | { |
743 | .compatible = "ti,tmp75b", | |
744 | .data = (void *)tmp75b | |
745 | }, | |
e97a45f1 JMC |
746 | { |
747 | .compatible = "ti,tmp75c", | |
748 | .data = (void *)tmp75c | |
749 | }, | |
750 | { }, | |
751 | }; | |
752 | MODULE_DEVICE_TABLE(of, lm75_of_match); | |
753 | ||
05e82fe4 LS |
754 | #define LM75A_ID 0xA1 |
755 | ||
8ff69eeb | 756 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
310ec792 | 757 | static int lm75_detect(struct i2c_client *new_client, |
8ff69eeb | 758 | struct i2c_board_info *info) |
1da177e4 | 759 | { |
8ff69eeb | 760 | struct i2c_adapter *adapter = new_client->adapter; |
1da177e4 | 761 | int i; |
e76f67b5 | 762 | int conf, hyst, os; |
05e82fe4 | 763 | bool is_lm75a = 0; |
1da177e4 | 764 | |
1da177e4 LT |
765 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
766 | I2C_FUNC_SMBUS_WORD_DATA)) | |
8ff69eeb | 767 | return -ENODEV; |
1da177e4 | 768 | |
426343ef JD |
769 | /* |
770 | * Now, we do the remaining detection. There is no identification- | |
771 | * dedicated register so we have to rely on several tricks: | |
772 | * unused bits, registers cycling over 8-address boundaries, | |
773 | * addresses 0x04-0x07 returning the last read value. | |
774 | * The cycling+unused addresses combination is not tested, | |
775 | * since it would significantly slow the detection down and would | |
776 | * hardly add any value. | |
777 | * | |
778 | * The National Semiconductor LM75A is different than earlier | |
779 | * LM75s. It has an ID byte of 0xaX (where X is the chip | |
780 | * revision, with 1 being the only revision in existence) in | |
781 | * register 7, and unused registers return 0xff rather than the | |
782 | * last read value. | |
783 | * | |
784 | * Note that this function only detects the original National | |
785 | * Semiconductor LM75 and the LM75A. Clones from other vendors | |
786 | * aren't detected, on purpose, because they are typically never | |
787 | * found on PC hardware. They are found on embedded designs where | |
788 | * they can be instantiated explicitly so detection is not needed. | |
789 | * The absence of identification registers on all these clones | |
790 | * would make their exhaustive detection very difficult and weak, | |
791 | * and odds are that the driver would bind to unsupported devices. | |
792 | */ | |
1da177e4 | 793 | |
e76f67b5 | 794 | /* Unused bits */ |
52df6440 | 795 | conf = i2c_smbus_read_byte_data(new_client, 1); |
e76f67b5 JD |
796 | if (conf & 0xe0) |
797 | return -ENODEV; | |
05e82fe4 LS |
798 | |
799 | /* First check for LM75A */ | |
800 | if (i2c_smbus_read_byte_data(new_client, 7) == LM75A_ID) { | |
8cbf2172 MO |
801 | /* |
802 | * LM75A returns 0xff on unused registers so | |
803 | * just to be sure we check for that too. | |
804 | */ | |
05e82fe4 LS |
805 | if (i2c_smbus_read_byte_data(new_client, 4) != 0xff |
806 | || i2c_smbus_read_byte_data(new_client, 5) != 0xff | |
807 | || i2c_smbus_read_byte_data(new_client, 6) != 0xff) | |
808 | return -ENODEV; | |
809 | is_lm75a = 1; | |
e76f67b5 JD |
810 | hyst = i2c_smbus_read_byte_data(new_client, 2); |
811 | os = i2c_smbus_read_byte_data(new_client, 3); | |
05e82fe4 LS |
812 | } else { /* Traditional style LM75 detection */ |
813 | /* Unused addresses */ | |
e76f67b5 JD |
814 | hyst = i2c_smbus_read_byte_data(new_client, 2); |
815 | if (i2c_smbus_read_byte_data(new_client, 4) != hyst | |
816 | || i2c_smbus_read_byte_data(new_client, 5) != hyst | |
817 | || i2c_smbus_read_byte_data(new_client, 6) != hyst | |
818 | || i2c_smbus_read_byte_data(new_client, 7) != hyst) | |
05e82fe4 | 819 | return -ENODEV; |
e76f67b5 JD |
820 | os = i2c_smbus_read_byte_data(new_client, 3); |
821 | if (i2c_smbus_read_byte_data(new_client, 4) != os | |
822 | || i2c_smbus_read_byte_data(new_client, 5) != os | |
823 | || i2c_smbus_read_byte_data(new_client, 6) != os | |
824 | || i2c_smbus_read_byte_data(new_client, 7) != os) | |
05e82fe4 LS |
825 | return -ENODEV; |
826 | } | |
4ad40cc5 GR |
827 | /* |
828 | * It is very unlikely that this is a LM75 if both | |
829 | * hysteresis and temperature limit registers are 0. | |
830 | */ | |
831 | if (hyst == 0 && os == 0) | |
832 | return -ENODEV; | |
1da177e4 | 833 | |
52df6440 | 834 | /* Addresses cycling */ |
e76f67b5 | 835 | for (i = 8; i <= 248; i += 40) { |
52df6440 | 836 | if (i2c_smbus_read_byte_data(new_client, i + 1) != conf |
e76f67b5 JD |
837 | || i2c_smbus_read_byte_data(new_client, i + 2) != hyst |
838 | || i2c_smbus_read_byte_data(new_client, i + 3) != os) | |
52df6440 | 839 | return -ENODEV; |
05e82fe4 LS |
840 | if (is_lm75a && i2c_smbus_read_byte_data(new_client, i + 7) |
841 | != LM75A_ID) | |
842 | return -ENODEV; | |
1da177e4 LT |
843 | } |
844 | ||
05e82fe4 | 845 | strlcpy(info->type, is_lm75a ? "lm75a" : "lm75", I2C_NAME_SIZE); |
c1685f61 | 846 | |
1da177e4 | 847 | return 0; |
01a52397 DB |
848 | } |
849 | ||
9914518e SD |
850 | #ifdef CONFIG_PM |
851 | static int lm75_suspend(struct device *dev) | |
852 | { | |
853 | int status; | |
854 | struct i2c_client *client = to_i2c_client(dev); | |
8cbf2172 | 855 | |
38aefb41 | 856 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
9914518e SD |
857 | if (status < 0) { |
858 | dev_dbg(&client->dev, "Can't read config? %d\n", status); | |
859 | return status; | |
860 | } | |
861 | status = status | LM75_SHUTDOWN; | |
38aefb41 | 862 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, status); |
9914518e SD |
863 | return 0; |
864 | } | |
865 | ||
866 | static int lm75_resume(struct device *dev) | |
867 | { | |
868 | int status; | |
869 | struct i2c_client *client = to_i2c_client(dev); | |
8cbf2172 | 870 | |
38aefb41 | 871 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
9914518e SD |
872 | if (status < 0) { |
873 | dev_dbg(&client->dev, "Can't read config? %d\n", status); | |
874 | return status; | |
875 | } | |
876 | status = status & ~LM75_SHUTDOWN; | |
38aefb41 | 877 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, status); |
9914518e SD |
878 | return 0; |
879 | } | |
880 | ||
881 | static const struct dev_pm_ops lm75_dev_pm_ops = { | |
882 | .suspend = lm75_suspend, | |
883 | .resume = lm75_resume, | |
884 | }; | |
885 | #define LM75_DEV_PM_OPS (&lm75_dev_pm_ops) | |
886 | #else | |
887 | #define LM75_DEV_PM_OPS NULL | |
888 | #endif /* CONFIG_PM */ | |
889 | ||
8ff69eeb JD |
890 | static struct i2c_driver lm75_driver = { |
891 | .class = I2C_CLASS_HWMON, | |
01a52397 | 892 | .driver = { |
8ff69eeb | 893 | .name = "lm75", |
e97a45f1 | 894 | .of_match_table = of_match_ptr(lm75_of_match), |
9914518e | 895 | .pm = LM75_DEV_PM_OPS, |
01a52397 | 896 | }, |
67487038 | 897 | .probe_new = lm75_probe, |
8ff69eeb JD |
898 | .id_table = lm75_ids, |
899 | .detect = lm75_detect, | |
c3813d6a | 900 | .address_list = normal_i2c, |
01a52397 DB |
901 | }; |
902 | ||
f0967eea | 903 | module_i2c_driver(lm75_driver); |
1da177e4 LT |
904 | |
905 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"); | |
906 | MODULE_DESCRIPTION("LM75 driver"); | |
907 | MODULE_LICENSE("GPL"); |