1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * lm75.c - Part of lm_sensors, Linux kernel modules for hardware |
4 | * monitoring |
5 | * Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> |
6 | */ |
7 | |
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> |
13 | #include <linux/hwmon.h> |
14 | #include <linux/hwmon-sysfs.h> |
15 | #include <linux/err.h> |
16 | #include <linux/of.h> |
17 | #include <linux/regmap.h> |
18 | #include <linux/util_macros.h> |
19 | #include <linux/regulator/consumer.h> |
20 | #include "lm75.h" |
21 | |
22 | /* |
23 | * This driver handles the LM75 and compatible digital temperature sensors. |
24 | */ |
25 | |
26 | enum lm75_type { /* keep sorted in alphabetical order */ |
27 | adt75, |
28 | at30ts74, |
29 | ds1775, |
30 | ds75, |
31 | ds7505, |
32 | g751, |
33 | lm75, |
34 | lm75a, |
35 | lm75b, |
36 | max6625, |
37 | max6626, |
38 | max31725, |
39 | mcp980x, |
40 | pct2075, |
41 | stds75, |
42 | stlm75, |
43 | tcn75, |
44 | tmp100, |
45 | tmp101, |
46 | tmp105, |
47 | tmp112, |
48 | tmp175, |
49 | tmp275, |
50 | tmp75, |
51 | tmp75b, |
52 | tmp75c, |
53 | tmp1075, |
54 | }; |
55 | |
56 | /** |
57 | * struct lm75_params - lm75 configuration parameters. |
58 | * @set_mask: Bits to set in configuration register when configuring |
59 | * the chip. |
60 | * @clr_mask: Bits to clear in configuration register when configuring |
61 | * the chip. |
62 | * @default_resolution: Default number of bits to represent the temperature |
63 | * value. |
64 | * @resolution_limits: Limit register resolution. Optional. Should be set if |
65 | * the resolution of limit registers does not match the |
66 | * resolution of the temperature register. |
67 | * @resolutions: List of resolutions associated with sample times. |
68 | * Optional. Should be set if num_sample_times is larger |
69 | * than 1, and if the resolution changes with sample times. |
70 | * If set, number of entries must match num_sample_times. |
71 | * @default_sample_time:Sample time to be set by default. |
72 | * @num_sample_times: Number of possible sample times to be set. Optional. |
73 | * Should be set if the number of sample times is larger |
74 | * than one. |
75 | * @sample_times: All the possible sample times to be set. Mandatory if |
76 | * num_sample_times is larger than 1. If set, number of |
77 | * entries must match num_sample_times. |
78 | */ |
79 | |
80 | struct lm75_params { |
81 | u8 set_mask; |
82 | u8 clr_mask; |
83 | u8 default_resolution; |
84 | u8 resolution_limits; |
85 | const u8 *resolutions; |
86 | unsigned int default_sample_time; |
87 | u8 num_sample_times; |
88 | const unsigned int *sample_times; |
89 | }; |
90 | |
91 | /* Addresses scanned */ |
92 | static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, |
93 | 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; |
94 | |
95 | /* The LM75 registers */ |
96 | #define LM75_REG_TEMP 0x00 |
97 | #define LM75_REG_CONF 0x01 |
98 | #define LM75_REG_HYST 0x02 |
99 | #define LM75_REG_MAX 0x03 |
100 | #define PCT2075_REG_IDLE 0x04 |
101 | |
102 | /* Each client has this additional data */ |
103 | struct lm75_data { |
104 | struct i2c_client *client; |
105 | struct regmap *regmap; |
106 | struct regulator *vs; |
107 | u8 orig_conf; |
108 | u8 current_conf; |
109 | u8 resolution; /* In bits, 9 to 16 */ |
110 | unsigned int sample_time; /* In ms */ |
111 | enum lm75_type kind; |
112 | const struct lm75_params *params; |
113 | }; |
114 | |
115 | /*-----------------------------------------------------------------------*/ |
116 | |
117 | static const u8 lm75_sample_set_masks[] = { 0 << 5, 1 << 5, 2 << 5, 3 << 5 }; |
118 | |
119 | #define LM75_SAMPLE_CLEAR_MASK (3 << 5) |
120 | |
121 | /* The structure below stores the configuration values of the supported devices. |
122 | * In case of being supported multiple configurations, the default one must |
123 | * always be the first element of the array |
124 | */ |
125 | static const struct lm75_params device_params[] = { |
126 | [adt75] = { |
127 | .clr_mask = 1 << 5, /* not one-shot mode */ |
128 | .default_resolution = 12, |
129 | .default_sample_time = MSEC_PER_SEC / 10, |
130 | }, |
131 | [at30ts74] = { |
132 | .set_mask = 3 << 5, /* 12-bit mode*/ |
133 | .default_resolution = 12, |
134 | .default_sample_time = 200, |
135 | .num_sample_times = 4, |
136 | .sample_times = (unsigned int []){ 25, 50, 100, 200 }, |
137 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
138 | }, |
139 | [ds1775] = { |
140 | .clr_mask = 3 << 5, |
141 | .set_mask = 2 << 5, /* 11-bit mode */ |
142 | .default_resolution = 11, |
143 | .default_sample_time = 500, |
144 | .num_sample_times = 4, |
145 | .sample_times = (unsigned int []){ 125, 250, 500, 1000 }, |
146 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
147 | }, |
148 | [ds75] = { |
149 | .clr_mask = 3 << 5, |
150 | .set_mask = 2 << 5, /* 11-bit mode */ |
151 | .default_resolution = 11, |
152 | .default_sample_time = 600, |
153 | .num_sample_times = 4, |
154 | .sample_times = (unsigned int []){ 150, 300, 600, 1200 }, |
155 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
156 | }, |
157 | [stds75] = { |
158 | .clr_mask = 3 << 5, |
159 | .set_mask = 2 << 5, /* 11-bit mode */ |
160 | .default_resolution = 11, |
161 | .default_sample_time = 600, |
162 | .num_sample_times = 4, |
163 | .sample_times = (unsigned int []){ 150, 300, 600, 1200 }, |
164 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
165 | }, |
166 | [stlm75] = { |
167 | .default_resolution = 9, |
168 | .default_sample_time = MSEC_PER_SEC / 6, |
169 | }, |
170 | [ds7505] = { |
171 | .set_mask = 3 << 5, /* 12-bit mode*/ |
172 | .default_resolution = 12, |
173 | .default_sample_time = 200, |
174 | .num_sample_times = 4, |
175 | .sample_times = (unsigned int []){ 25, 50, 100, 200 }, |
176 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
177 | }, |
178 | [g751] = { |
179 | .default_resolution = 9, |
180 | .default_sample_time = MSEC_PER_SEC / 10, |
181 | }, |
182 | [lm75] = { |
183 | .default_resolution = 9, |
184 | .default_sample_time = MSEC_PER_SEC / 10, |
185 | }, |
186 | [lm75a] = { |
187 | .default_resolution = 9, |
188 | .default_sample_time = MSEC_PER_SEC / 10, |
189 | }, |
190 | [lm75b] = { |
191 | .default_resolution = 11, |
192 | .default_sample_time = MSEC_PER_SEC / 10, |
193 | }, |
194 | [max6625] = { |
195 | .default_resolution = 9, |
196 | .default_sample_time = MSEC_PER_SEC / 7, |
197 | }, |
198 | [max6626] = { |
199 | .default_resolution = 12, |
200 | .default_sample_time = MSEC_PER_SEC / 7, |
201 | .resolution_limits = 9, |
202 | }, |
203 | [max31725] = { |
204 | .default_resolution = 16, |
205 | .default_sample_time = MSEC_PER_SEC / 20, |
206 | }, |
207 | [tcn75] = { |
208 | .default_resolution = 9, |
209 | .default_sample_time = MSEC_PER_SEC / 18, |
210 | }, |
211 | [pct2075] = { |
212 | .default_resolution = 11, |
213 | .default_sample_time = MSEC_PER_SEC / 10, |
214 | .num_sample_times = 31, |
215 | .sample_times = (unsigned int []){ 100, 200, 300, 400, 500, 600, |
216 | 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, |
217 | 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, |
218 | 2800, 2900, 3000, 3100 }, |
219 | }, |
220 | [mcp980x] = { |
221 | .set_mask = 3 << 5, /* 12-bit mode */ |
222 | .clr_mask = 1 << 7, /* not one-shot mode */ |
223 | .default_resolution = 12, |
224 | .resolution_limits = 9, |
225 | .default_sample_time = 240, |
226 | .num_sample_times = 4, |
227 | .sample_times = (unsigned int []){ 30, 60, 120, 240 }, |
228 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
229 | }, |
230 | [tmp100] = { |
231 | .set_mask = 3 << 5, /* 12-bit mode */ |
232 | .clr_mask = 1 << 7, /* not one-shot mode */ |
233 | .default_resolution = 12, |
234 | .default_sample_time = 320, |
235 | .num_sample_times = 4, |
236 | .sample_times = (unsigned int []){ 40, 80, 160, 320 }, |
237 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
238 | }, |
239 | [tmp101] = { |
240 | .set_mask = 3 << 5, /* 12-bit mode */ |
241 | .clr_mask = 1 << 7, /* not one-shot mode */ |
242 | .default_resolution = 12, |
243 | .default_sample_time = 320, |
244 | .num_sample_times = 4, |
245 | .sample_times = (unsigned int []){ 40, 80, 160, 320 }, |
246 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
247 | }, |
248 | [tmp105] = { |
249 | .set_mask = 3 << 5, /* 12-bit mode */ |
250 | .clr_mask = 1 << 7, /* not one-shot mode*/ |
251 | .default_resolution = 12, |
252 | .default_sample_time = 220, |
253 | .num_sample_times = 4, |
254 | .sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
255 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
256 | }, |
257 | [tmp112] = { |
258 | .set_mask = 3 << 5, /* 8 samples / second */ |
259 | .clr_mask = 1 << 7, /* no one-shot mode*/ |
260 | .default_resolution = 12, |
261 | .default_sample_time = 125, |
262 | .num_sample_times = 4, |
263 | .sample_times = (unsigned int []){ 125, 250, 1000, 4000 }, |
264 | }, |
265 | [tmp175] = { |
266 | .set_mask = 3 << 5, /* 12-bit mode */ |
267 | .clr_mask = 1 << 7, /* not one-shot mode*/ |
268 | .default_resolution = 12, |
269 | .default_sample_time = 220, |
270 | .num_sample_times = 4, |
271 | .sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
272 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
273 | }, |
274 | [tmp275] = { |
275 | .set_mask = 3 << 5, /* 12-bit mode */ |
276 | .clr_mask = 1 << 7, /* not one-shot mode*/ |
277 | .default_resolution = 12, |
278 | .default_sample_time = 220, |
279 | .num_sample_times = 4, |
280 | .sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
281 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
282 | }, |
283 | [tmp75] = { |
284 | .set_mask = 3 << 5, /* 12-bit mode */ |
285 | .clr_mask = 1 << 7, /* not one-shot mode*/ |
286 | .default_resolution = 12, |
287 | .default_sample_time = 220, |
288 | .num_sample_times = 4, |
289 | .sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
290 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
291 | }, |
292 | [tmp75b] = { /* not one-shot mode, Conversion rate 37Hz */ |
293 | .clr_mask = 1 << 7 | 3 << 5, |
294 | .default_resolution = 12, |
295 | .default_sample_time = MSEC_PER_SEC / 37, |
296 | .sample_times = (unsigned int []){ MSEC_PER_SEC / 37, |
297 | MSEC_PER_SEC / 18, |
298 | MSEC_PER_SEC / 9, MSEC_PER_SEC / 4 }, |
299 | .num_sample_times = 4, |
300 | }, |
301 | [tmp75c] = { |
302 | .clr_mask = 1 << 5, /*not one-shot mode*/ |
303 | .default_resolution = 12, |
304 | .default_sample_time = MSEC_PER_SEC / 12, |
305 | }, |
306 | [tmp1075] = { /* not one-shot mode, 27.5 ms sample rate */ |
307 | .clr_mask = 1 << 5 | 1 << 6 | 1 << 7, |
308 | .default_resolution = 12, |
309 | .default_sample_time = 28, |
310 | .num_sample_times = 4, |
311 | .sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
312 | } |
313 | }; |
314 | |
315 | static inline long lm75_reg_to_mc(s16 temp, u8 resolution) |
316 | { |
317 | return ((temp >> (16 - resolution)) * 1000) >> (resolution - 8); |
318 | } |
319 | |
320 | static int lm75_write_config(struct lm75_data *data, u8 set_mask, |
321 | u8 clr_mask) |
322 | { |
323 | u8 value; |
324 | |
325 | clr_mask |= LM75_SHUTDOWN; |
326 | value = data->current_conf & ~clr_mask; |
327 | value |= set_mask; |
328 | |
329 | if (data->current_conf != value) { |
330 | s32 err; |
331 | |
332 | err = i2c_smbus_write_byte_data(client: data->client, LM75_REG_CONF, |
333 | value); |
334 | if (err) |
335 | return err; |
336 | data->current_conf = value; |
337 | } |
338 | return 0; |
339 | } |
340 | |
341 | static int lm75_read(struct device *dev, enum hwmon_sensor_types type, |
342 | u32 attr, int channel, long *val) |
343 | { |
344 | struct lm75_data *data = dev_get_drvdata(dev); |
345 | unsigned int regval; |
346 | int err, reg; |
347 | |
348 | switch (type) { |
349 | case hwmon_chip: |
350 | switch (attr) { |
351 | case hwmon_chip_update_interval: |
352 | *val = data->sample_time; |
353 | break; |
354 | default: |
355 | return -EINVAL; |
356 | } |
357 | break; |
358 | case hwmon_temp: |
359 | switch (attr) { |
360 | case hwmon_temp_input: |
361 | reg = LM75_REG_TEMP; |
362 | break; |
363 | case hwmon_temp_max: |
364 | reg = LM75_REG_MAX; |
365 | break; |
366 | case hwmon_temp_max_hyst: |
367 | reg = LM75_REG_HYST; |
368 | break; |
369 | default: |
370 | return -EINVAL; |
371 | } |
372 | err = regmap_read(map: data->regmap, reg, val: ®val); |
373 | if (err < 0) |
374 | return err; |
375 | |
376 | *val = lm75_reg_to_mc(temp: regval, resolution: data->resolution); |
377 | break; |
378 | default: |
379 | return -EINVAL; |
380 | } |
381 | return 0; |
382 | } |
383 | |
384 | static int lm75_write_temp(struct device *dev, u32 attr, long temp) |
385 | { |
386 | struct lm75_data *data = dev_get_drvdata(dev); |
387 | u8 resolution; |
388 | int reg; |
389 | |
390 | switch (attr) { |
391 | case hwmon_temp_max: |
392 | reg = LM75_REG_MAX; |
393 | break; |
394 | case hwmon_temp_max_hyst: |
395 | reg = LM75_REG_HYST; |
396 | break; |
397 | default: |
398 | return -EINVAL; |
399 | } |
400 | |
401 | /* |
402 | * Resolution of limit registers is assumed to be the same as the |
403 | * temperature input register resolution unless given explicitly. |
404 | */ |
405 | if (data->params->resolution_limits) |
406 | resolution = data->params->resolution_limits; |
407 | else |
408 | resolution = data->resolution; |
409 | |
410 | temp = clamp_val(temp, LM75_TEMP_MIN, LM75_TEMP_MAX); |
411 | temp = DIV_ROUND_CLOSEST(temp << (resolution - 8), |
412 | 1000) << (16 - resolution); |
413 | |
414 | return regmap_write(map: data->regmap, reg, val: (u16)temp); |
415 | } |
416 | |
417 | static int lm75_update_interval(struct device *dev, long val) |
418 | { |
419 | struct lm75_data *data = dev_get_drvdata(dev); |
420 | unsigned int reg; |
421 | u8 index; |
422 | s32 err; |
423 | |
424 | index = find_closest(val, data->params->sample_times, |
425 | (int)data->params->num_sample_times); |
426 | |
427 | switch (data->kind) { |
428 | default: |
429 | err = lm75_write_config(data, set_mask: lm75_sample_set_masks[index], |
430 | LM75_SAMPLE_CLEAR_MASK); |
431 | if (err) |
432 | return err; |
433 | |
434 | data->sample_time = data->params->sample_times[index]; |
435 | if (data->params->resolutions) |
436 | data->resolution = data->params->resolutions[index]; |
437 | break; |
438 | case tmp112: |
439 | err = regmap_read(map: data->regmap, LM75_REG_CONF, val: ®); |
440 | if (err < 0) |
441 | return err; |
442 | reg &= ~0x00c0; |
443 | reg |= (3 - index) << 6; |
444 | err = regmap_write(map: data->regmap, LM75_REG_CONF, val: reg); |
445 | if (err < 0) |
446 | return err; |
447 | data->sample_time = data->params->sample_times[index]; |
448 | break; |
449 | case pct2075: |
450 | err = i2c_smbus_write_byte_data(client: data->client, PCT2075_REG_IDLE, |
451 | value: index + 1); |
452 | if (err) |
453 | return err; |
454 | data->sample_time = data->params->sample_times[index]; |
455 | break; |
456 | } |
457 | return 0; |
458 | } |
459 | |
460 | static int lm75_write_chip(struct device *dev, u32 attr, long val) |
461 | { |
462 | switch (attr) { |
463 | case hwmon_chip_update_interval: |
464 | return lm75_update_interval(dev, val); |
465 | default: |
466 | return -EINVAL; |
467 | } |
468 | return 0; |
469 | } |
470 | |
471 | static int lm75_write(struct device *dev, enum hwmon_sensor_types type, |
472 | u32 attr, int channel, long val) |
473 | { |
474 | switch (type) { |
475 | case hwmon_chip: |
476 | return lm75_write_chip(dev, attr, val); |
477 | case hwmon_temp: |
478 | return lm75_write_temp(dev, attr, temp: val); |
479 | default: |
480 | return -EINVAL; |
481 | } |
482 | return 0; |
483 | } |
484 | |
485 | static umode_t lm75_is_visible(const void *data, enum hwmon_sensor_types type, |
486 | u32 attr, int channel) |
487 | { |
488 | const struct lm75_data *config_data = data; |
489 | |
490 | switch (type) { |
491 | case hwmon_chip: |
492 | switch (attr) { |
493 | case hwmon_chip_update_interval: |
494 | if (config_data->params->num_sample_times > 1) |
495 | return 0644; |
496 | return 0444; |
497 | } |
498 | break; |
499 | case hwmon_temp: |
500 | switch (attr) { |
501 | case hwmon_temp_input: |
502 | return 0444; |
503 | case hwmon_temp_max: |
504 | case hwmon_temp_max_hyst: |
505 | return 0644; |
506 | } |
507 | break; |
508 | default: |
509 | break; |
510 | } |
511 | return 0; |
512 | } |
513 | |
514 | static const struct hwmon_channel_info * const lm75_info[] = { |
515 | HWMON_CHANNEL_INFO(chip, |
516 | HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL), |
517 | HWMON_CHANNEL_INFO(temp, |
518 | HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST), |
519 | NULL |
520 | }; |
521 | |
522 | static const struct hwmon_ops lm75_hwmon_ops = { |
523 | .is_visible = lm75_is_visible, |
524 | .read = lm75_read, |
525 | .write = lm75_write, |
526 | }; |
527 | |
528 | static const struct hwmon_chip_info lm75_chip_info = { |
529 | .ops = &lm75_hwmon_ops, |
530 | .info = lm75_info, |
531 | }; |
532 | |
533 | static bool lm75_is_writeable_reg(struct device *dev, unsigned int reg) |
534 | { |
535 | return reg != LM75_REG_TEMP; |
536 | } |
537 | |
538 | static bool lm75_is_volatile_reg(struct device *dev, unsigned int reg) |
539 | { |
540 | return reg == LM75_REG_TEMP || reg == LM75_REG_CONF; |
541 | } |
542 | |
543 | static const struct regmap_config lm75_regmap_config = { |
544 | .reg_bits = 8, |
545 | .val_bits = 16, |
546 | .max_register = PCT2075_REG_IDLE, |
547 | .writeable_reg = lm75_is_writeable_reg, |
548 | .volatile_reg = lm75_is_volatile_reg, |
549 | .val_format_endian = REGMAP_ENDIAN_BIG, |
550 | .cache_type = REGCACHE_MAPLE, |
551 | .use_single_read = true, |
552 | .use_single_write = true, |
553 | }; |
554 | |
555 | static void lm75_disable_regulator(void *data) |
556 | { |
557 | struct lm75_data *lm75 = data; |
558 | |
559 | regulator_disable(regulator: lm75->vs); |
560 | } |
561 | |
562 | static void lm75_remove(void *data) |
563 | { |
564 | struct lm75_data *lm75 = data; |
565 | struct i2c_client *client = lm75->client; |
566 | |
567 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, value: lm75->orig_conf); |
568 | } |
569 | |
570 | static const struct i2c_device_id lm75_ids[]; |
571 | |
572 | static int lm75_probe(struct i2c_client *client) |
573 | { |
574 | struct device *dev = &client->dev; |
575 | struct device *hwmon_dev; |
576 | struct lm75_data *data; |
577 | int status, err; |
578 | enum lm75_type kind; |
579 | |
580 | if (client->dev.of_node) |
581 | kind = (uintptr_t)of_device_get_match_data(dev: &client->dev); |
582 | else |
583 | kind = i2c_match_id(id: lm75_ids, client)->driver_data; |
584 | |
585 | if (!i2c_check_functionality(adap: client->adapter, |
586 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) |
587 | return -EIO; |
588 | |
589 | data = devm_kzalloc(dev, size: sizeof(struct lm75_data), GFP_KERNEL); |
590 | if (!data) |
591 | return -ENOMEM; |
592 | |
593 | data->client = client; |
594 | data->kind = kind; |
595 | |
596 | data->vs = devm_regulator_get(dev, id: "vs" ); |
597 | if (IS_ERR(ptr: data->vs)) |
598 | return PTR_ERR(ptr: data->vs); |
599 | |
600 | data->regmap = devm_regmap_init_i2c(client, &lm75_regmap_config); |
601 | if (IS_ERR(ptr: data->regmap)) |
602 | return PTR_ERR(ptr: data->regmap); |
603 | |
604 | /* Set to LM75 resolution (9 bits, 1/2 degree C) and range. |
605 | * Then tweak to be more precise when appropriate. |
606 | */ |
607 | |
608 | data->params = &device_params[data->kind]; |
609 | |
610 | /* Save default sample time and resolution*/ |
611 | data->sample_time = data->params->default_sample_time; |
612 | data->resolution = data->params->default_resolution; |
613 | |
614 | /* Enable the power */ |
615 | err = regulator_enable(regulator: data->vs); |
616 | if (err) { |
617 | dev_err(dev, "failed to enable regulator: %d\n" , err); |
618 | return err; |
619 | } |
620 | |
621 | err = devm_add_action_or_reset(dev, lm75_disable_regulator, data); |
622 | if (err) |
623 | return err; |
624 | |
625 | /* Cache original configuration */ |
626 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
627 | if (status < 0) { |
628 | dev_dbg(dev, "Can't read config? %d\n" , status); |
629 | return status; |
630 | } |
631 | data->orig_conf = status; |
632 | data->current_conf = status; |
633 | |
634 | err = lm75_write_config(data, set_mask: data->params->set_mask, |
635 | clr_mask: data->params->clr_mask); |
636 | if (err) |
637 | return err; |
638 | |
639 | err = devm_add_action_or_reset(dev, lm75_remove, data); |
640 | if (err) |
641 | return err; |
642 | |
643 | hwmon_dev = devm_hwmon_device_register_with_info(dev, name: client->name, |
644 | drvdata: data, info: &lm75_chip_info, |
645 | NULL); |
646 | if (IS_ERR(ptr: hwmon_dev)) |
647 | return PTR_ERR(ptr: hwmon_dev); |
648 | |
649 | dev_info(dev, "%s: sensor '%s'\n" , dev_name(hwmon_dev), client->name); |
650 | |
651 | return 0; |
652 | } |
653 | |
654 | static const struct i2c_device_id lm75_ids[] = { |
655 | { "adt75" , adt75, }, |
656 | { "at30ts74" , at30ts74, }, |
657 | { "ds1775" , ds1775, }, |
658 | { "ds75" , ds75, }, |
659 | { "ds7505" , ds7505, }, |
660 | { "g751" , g751, }, |
661 | { "lm75" , lm75, }, |
662 | { "lm75a" , lm75a, }, |
663 | { "lm75b" , lm75b, }, |
664 | { "max6625" , max6625, }, |
665 | { "max6626" , max6626, }, |
666 | { "max31725" , max31725, }, |
667 | { "max31726" , max31725, }, |
668 | { "mcp980x" , mcp980x, }, |
669 | { "pct2075" , pct2075, }, |
670 | { "stds75" , stds75, }, |
671 | { "stlm75" , stlm75, }, |
672 | { "tcn75" , tcn75, }, |
673 | { "tmp100" , tmp100, }, |
674 | { "tmp101" , tmp101, }, |
675 | { "tmp105" , tmp105, }, |
676 | { "tmp112" , tmp112, }, |
677 | { "tmp175" , tmp175, }, |
678 | { "tmp275" , tmp275, }, |
679 | { "tmp75" , tmp75, }, |
680 | { "tmp75b" , tmp75b, }, |
681 | { "tmp75c" , tmp75c, }, |
682 | { "tmp1075" , tmp1075, }, |
683 | { /* LIST END */ } |
684 | }; |
685 | MODULE_DEVICE_TABLE(i2c, lm75_ids); |
686 | |
687 | static const struct of_device_id __maybe_unused lm75_of_match[] = { |
688 | { |
689 | .compatible = "adi,adt75" , |
690 | .data = (void *)adt75 |
691 | }, |
692 | { |
693 | .compatible = "atmel,at30ts74" , |
694 | .data = (void *)at30ts74 |
695 | }, |
696 | { |
697 | .compatible = "dallas,ds1775" , |
698 | .data = (void *)ds1775 |
699 | }, |
700 | { |
701 | .compatible = "dallas,ds75" , |
702 | .data = (void *)ds75 |
703 | }, |
704 | { |
705 | .compatible = "dallas,ds7505" , |
706 | .data = (void *)ds7505 |
707 | }, |
708 | { |
709 | .compatible = "gmt,g751" , |
710 | .data = (void *)g751 |
711 | }, |
712 | { |
713 | .compatible = "national,lm75" , |
714 | .data = (void *)lm75 |
715 | }, |
716 | { |
717 | .compatible = "national,lm75a" , |
718 | .data = (void *)lm75a |
719 | }, |
720 | { |
721 | .compatible = "national,lm75b" , |
722 | .data = (void *)lm75b |
723 | }, |
724 | { |
725 | .compatible = "maxim,max6625" , |
726 | .data = (void *)max6625 |
727 | }, |
728 | { |
729 | .compatible = "maxim,max6626" , |
730 | .data = (void *)max6626 |
731 | }, |
732 | { |
733 | .compatible = "maxim,max31725" , |
734 | .data = (void *)max31725 |
735 | }, |
736 | { |
737 | .compatible = "maxim,max31726" , |
738 | .data = (void *)max31725 |
739 | }, |
740 | { |
741 | .compatible = "maxim,mcp980x" , |
742 | .data = (void *)mcp980x |
743 | }, |
744 | { |
745 | .compatible = "nxp,pct2075" , |
746 | .data = (void *)pct2075 |
747 | }, |
748 | { |
749 | .compatible = "st,stds75" , |
750 | .data = (void *)stds75 |
751 | }, |
752 | { |
753 | .compatible = "st,stlm75" , |
754 | .data = (void *)stlm75 |
755 | }, |
756 | { |
757 | .compatible = "microchip,tcn75" , |
758 | .data = (void *)tcn75 |
759 | }, |
760 | { |
761 | .compatible = "ti,tmp100" , |
762 | .data = (void *)tmp100 |
763 | }, |
764 | { |
765 | .compatible = "ti,tmp101" , |
766 | .data = (void *)tmp101 |
767 | }, |
768 | { |
769 | .compatible = "ti,tmp105" , |
770 | .data = (void *)tmp105 |
771 | }, |
772 | { |
773 | .compatible = "ti,tmp112" , |
774 | .data = (void *)tmp112 |
775 | }, |
776 | { |
777 | .compatible = "ti,tmp175" , |
778 | .data = (void *)tmp175 |
779 | }, |
780 | { |
781 | .compatible = "ti,tmp275" , |
782 | .data = (void *)tmp275 |
783 | }, |
784 | { |
785 | .compatible = "ti,tmp75" , |
786 | .data = (void *)tmp75 |
787 | }, |
788 | { |
789 | .compatible = "ti,tmp75b" , |
790 | .data = (void *)tmp75b |
791 | }, |
792 | { |
793 | .compatible = "ti,tmp75c" , |
794 | .data = (void *)tmp75c |
795 | }, |
796 | { |
797 | .compatible = "ti,tmp1075" , |
798 | .data = (void *)tmp1075 |
799 | }, |
800 | { }, |
801 | }; |
802 | MODULE_DEVICE_TABLE(of, lm75_of_match); |
803 | |
804 | #define LM75A_ID 0xA1 |
805 | |
806 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
807 | static int lm75_detect(struct i2c_client *new_client, |
808 | struct i2c_board_info *info) |
809 | { |
810 | struct i2c_adapter *adapter = new_client->adapter; |
811 | int i; |
812 | int conf, hyst, os; |
813 | bool is_lm75a = 0; |
814 | |
815 | if (!i2c_check_functionality(adap: adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
816 | I2C_FUNC_SMBUS_WORD_DATA)) |
817 | return -ENODEV; |
818 | |
819 | /* |
820 | * Now, we do the remaining detection. There is no identification- |
821 | * dedicated register so we have to rely on several tricks: |
822 | * unused bits, registers cycling over 8-address boundaries, |
823 | * addresses 0x04-0x07 returning the last read value. |
824 | * The cycling+unused addresses combination is not tested, |
825 | * since it would significantly slow the detection down and would |
826 | * hardly add any value. |
827 | * |
828 | * The National Semiconductor LM75A is different than earlier |
829 | * LM75s. It has an ID byte of 0xaX (where X is the chip |
830 | * revision, with 1 being the only revision in existence) in |
831 | * register 7, and unused registers return 0xff rather than the |
832 | * last read value. |
833 | * |
834 | * Note that this function only detects the original National |
835 | * Semiconductor LM75 and the LM75A. Clones from other vendors |
836 | * aren't detected, on purpose, because they are typically never |
837 | * found on PC hardware. They are found on embedded designs where |
838 | * they can be instantiated explicitly so detection is not needed. |
839 | * The absence of identification registers on all these clones |
840 | * would make their exhaustive detection very difficult and weak, |
841 | * and odds are that the driver would bind to unsupported devices. |
842 | */ |
843 | |
844 | /* Unused bits */ |
845 | conf = i2c_smbus_read_byte_data(client: new_client, command: 1); |
846 | if (conf & 0xe0) |
847 | return -ENODEV; |
848 | |
849 | /* First check for LM75A */ |
850 | if (i2c_smbus_read_byte_data(client: new_client, command: 7) == LM75A_ID) { |
851 | /* |
852 | * LM75A returns 0xff on unused registers so |
853 | * just to be sure we check for that too. |
854 | */ |
855 | if (i2c_smbus_read_byte_data(client: new_client, command: 4) != 0xff |
856 | || i2c_smbus_read_byte_data(client: new_client, command: 5) != 0xff |
857 | || i2c_smbus_read_byte_data(client: new_client, command: 6) != 0xff) |
858 | return -ENODEV; |
859 | is_lm75a = 1; |
860 | hyst = i2c_smbus_read_byte_data(client: new_client, command: 2); |
861 | os = i2c_smbus_read_byte_data(client: new_client, command: 3); |
862 | } else { /* Traditional style LM75 detection */ |
863 | /* Unused addresses */ |
864 | hyst = i2c_smbus_read_byte_data(client: new_client, command: 2); |
865 | if (i2c_smbus_read_byte_data(client: new_client, command: 4) != hyst |
866 | || i2c_smbus_read_byte_data(client: new_client, command: 5) != hyst |
867 | || i2c_smbus_read_byte_data(client: new_client, command: 6) != hyst |
868 | || i2c_smbus_read_byte_data(client: new_client, command: 7) != hyst) |
869 | return -ENODEV; |
870 | os = i2c_smbus_read_byte_data(client: new_client, command: 3); |
871 | if (i2c_smbus_read_byte_data(client: new_client, command: 4) != os |
872 | || i2c_smbus_read_byte_data(client: new_client, command: 5) != os |
873 | || i2c_smbus_read_byte_data(client: new_client, command: 6) != os |
874 | || i2c_smbus_read_byte_data(client: new_client, command: 7) != os) |
875 | return -ENODEV; |
876 | } |
877 | /* |
878 | * It is very unlikely that this is a LM75 if both |
879 | * hysteresis and temperature limit registers are 0. |
880 | */ |
881 | if (hyst == 0 && os == 0) |
882 | return -ENODEV; |
883 | |
884 | /* Addresses cycling */ |
885 | for (i = 8; i <= 248; i += 40) { |
886 | if (i2c_smbus_read_byte_data(client: new_client, command: i + 1) != conf |
887 | || i2c_smbus_read_byte_data(client: new_client, command: i + 2) != hyst |
888 | || i2c_smbus_read_byte_data(client: new_client, command: i + 3) != os) |
889 | return -ENODEV; |
890 | if (is_lm75a && i2c_smbus_read_byte_data(client: new_client, command: i + 7) |
891 | != LM75A_ID) |
892 | return -ENODEV; |
893 | } |
894 | |
895 | strscpy(p: info->type, q: is_lm75a ? "lm75a" : "lm75" , I2C_NAME_SIZE); |
896 | |
897 | return 0; |
898 | } |
899 | |
900 | #ifdef CONFIG_PM |
901 | static int lm75_suspend(struct device *dev) |
902 | { |
903 | int status; |
904 | struct i2c_client *client = to_i2c_client(dev); |
905 | |
906 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
907 | if (status < 0) { |
908 | dev_dbg(&client->dev, "Can't read config? %d\n" , status); |
909 | return status; |
910 | } |
911 | status = status | LM75_SHUTDOWN; |
912 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, value: status); |
913 | return 0; |
914 | } |
915 | |
916 | static int lm75_resume(struct device *dev) |
917 | { |
918 | int status; |
919 | struct i2c_client *client = to_i2c_client(dev); |
920 | |
921 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
922 | if (status < 0) { |
923 | dev_dbg(&client->dev, "Can't read config? %d\n" , status); |
924 | return status; |
925 | } |
926 | status = status & ~LM75_SHUTDOWN; |
927 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, value: status); |
928 | return 0; |
929 | } |
930 | |
931 | static const struct dev_pm_ops lm75_dev_pm_ops = { |
932 | .suspend = lm75_suspend, |
933 | .resume = lm75_resume, |
934 | }; |
935 | #define LM75_DEV_PM_OPS (&lm75_dev_pm_ops) |
936 | #else |
937 | #define LM75_DEV_PM_OPS NULL |
938 | #endif /* CONFIG_PM */ |
939 | |
940 | static struct i2c_driver lm75_driver = { |
941 | .class = I2C_CLASS_HWMON, |
942 | .driver = { |
943 | .name = "lm75" , |
944 | .of_match_table = of_match_ptr(lm75_of_match), |
945 | .pm = LM75_DEV_PM_OPS, |
946 | }, |
947 | .probe = lm75_probe, |
948 | .id_table = lm75_ids, |
949 | .detect = lm75_detect, |
950 | .address_list = normal_i2c, |
951 | }; |
952 | |
953 | module_i2c_driver(lm75_driver); |
954 | |
955 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>" ); |
956 | MODULE_DESCRIPTION("LM75 driver" ); |
957 | MODULE_LICENSE("GPL" ); |
958 | |