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/interrupt.h> |
11 | #include <linux/slab.h> |
12 | #include <linux/jiffies.h> |
13 | #include <linux/i2c.h> |
14 | #include <linux/hwmon.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 | as6200, |
29 | at30ts74, |
30 | ds1775, |
31 | ds75, |
32 | ds7505, |
33 | g751, |
34 | lm75, |
35 | lm75a, |
36 | lm75b, |
37 | max6625, |
38 | max6626, |
39 | max31725, |
40 | mcp980x, |
41 | pct2075, |
42 | stds75, |
43 | stlm75, |
44 | tcn75, |
45 | tmp100, |
46 | tmp101, |
47 | tmp105, |
48 | tmp112, |
49 | tmp175, |
50 | tmp275, |
51 | tmp75, |
52 | tmp75b, |
53 | tmp75c, |
54 | tmp1075, |
55 | }; |
56 | |
57 | /** |
58 | * struct lm75_params - lm75 configuration parameters. |
59 | * @config_reg_16bits: Configure register size is 2 bytes. |
60 | * @set_mask: Bits to set in configuration register when configuring |
61 | * the chip. |
62 | * @clr_mask: Bits to clear in configuration register when configuring |
63 | * the chip. |
64 | * @default_resolution: Default number of bits to represent the temperature |
65 | * value. |
66 | * @resolution_limits: Limit register resolution. Optional. Should be set if |
67 | * the resolution of limit registers does not match the |
68 | * resolution of the temperature register. |
69 | * @resolutions: List of resolutions associated with sample times. |
70 | * Optional. Should be set if num_sample_times is larger |
71 | * than 1, and if the resolution changes with sample times. |
72 | * If set, number of entries must match num_sample_times. |
73 | * @default_sample_time:Sample time to be set by default. |
74 | * @num_sample_times: Number of possible sample times to be set. Optional. |
75 | * Should be set if the number of sample times is larger |
76 | * than one. |
77 | * @sample_times: All the possible sample times to be set. Mandatory if |
78 | * num_sample_times is larger than 1. If set, number of |
79 | * entries must match num_sample_times. |
80 | * @alarm: Alarm bit is supported. |
81 | */ |
82 | |
83 | struct lm75_params { |
84 | bool config_reg_16bits; |
85 | u16 set_mask; |
86 | u16 clr_mask; |
87 | u8 default_resolution; |
88 | u8 resolution_limits; |
89 | const u8 *resolutions; |
90 | unsigned int default_sample_time; |
91 | u8 num_sample_times; |
92 | const unsigned int *sample_times; |
93 | bool alarm; |
94 | }; |
95 | |
96 | /* Addresses scanned */ |
97 | static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, |
98 | 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; |
99 | |
100 | /* The LM75 registers */ |
101 | #define LM75_REG_TEMP 0x00 |
102 | #define LM75_REG_CONF 0x01 |
103 | #define LM75_REG_HYST 0x02 |
104 | #define LM75_REG_MAX 0x03 |
105 | #define PCT2075_REG_IDLE 0x04 |
106 | |
107 | /* Each client has this additional data */ |
108 | struct lm75_data { |
109 | struct i2c_client *client; |
110 | struct regmap *regmap; |
111 | struct regulator *vs; |
112 | u16 orig_conf; |
113 | u16 current_conf; |
114 | u8 resolution; /* In bits, 9 to 16 */ |
115 | unsigned int sample_time; /* In ms */ |
116 | enum lm75_type kind; |
117 | const struct lm75_params *params; |
118 | }; |
119 | |
120 | /*-----------------------------------------------------------------------*/ |
121 | |
122 | static const u8 lm75_sample_set_masks[] = { 0 << 5, 1 << 5, 2 << 5, 3 << 5 }; |
123 | |
124 | #define LM75_SAMPLE_CLEAR_MASK (3 << 5) |
125 | |
126 | /* The structure below stores the configuration values of the supported devices. |
127 | * In case of being supported multiple configurations, the default one must |
128 | * always be the first element of the array |
129 | */ |
130 | static const struct lm75_params device_params[] = { |
131 | [adt75] = { |
132 | .clr_mask = 1 << 5, /* not one-shot mode */ |
133 | .default_resolution = 12, |
134 | .default_sample_time = MSEC_PER_SEC / 10, |
135 | }, |
136 | [as6200] = { |
137 | .config_reg_16bits = true, |
138 | .set_mask = 0x94C0, /* 8 sample/s, 4 CF, positive polarity */ |
139 | .default_resolution = 12, |
140 | .default_sample_time = 125, |
141 | .num_sample_times = 4, |
142 | .sample_times = (unsigned int []){ 125, 250, 1000, 4000 }, |
143 | .alarm = true, |
144 | }, |
145 | [at30ts74] = { |
146 | .set_mask = 3 << 5, /* 12-bit mode*/ |
147 | .default_resolution = 12, |
148 | .default_sample_time = 200, |
149 | .num_sample_times = 4, |
150 | .sample_times = (unsigned int []){ 25, 50, 100, 200 }, |
151 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
152 | }, |
153 | [ds1775] = { |
154 | .clr_mask = 3 << 5, |
155 | .set_mask = 2 << 5, /* 11-bit mode */ |
156 | .default_resolution = 11, |
157 | .default_sample_time = 500, |
158 | .num_sample_times = 4, |
159 | .sample_times = (unsigned int []){ 125, 250, 500, 1000 }, |
160 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
161 | }, |
162 | [ds75] = { |
163 | .clr_mask = 3 << 5, |
164 | .set_mask = 2 << 5, /* 11-bit mode */ |
165 | .default_resolution = 11, |
166 | .default_sample_time = 600, |
167 | .num_sample_times = 4, |
168 | .sample_times = (unsigned int []){ 150, 300, 600, 1200 }, |
169 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
170 | }, |
171 | [stds75] = { |
172 | .clr_mask = 3 << 5, |
173 | .set_mask = 2 << 5, /* 11-bit mode */ |
174 | .default_resolution = 11, |
175 | .default_sample_time = 600, |
176 | .num_sample_times = 4, |
177 | .sample_times = (unsigned int []){ 150, 300, 600, 1200 }, |
178 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
179 | }, |
180 | [stlm75] = { |
181 | .default_resolution = 9, |
182 | .default_sample_time = MSEC_PER_SEC / 6, |
183 | }, |
184 | [ds7505] = { |
185 | .set_mask = 3 << 5, /* 12-bit mode*/ |
186 | .default_resolution = 12, |
187 | .default_sample_time = 200, |
188 | .num_sample_times = 4, |
189 | .sample_times = (unsigned int []){ 25, 50, 100, 200 }, |
190 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
191 | }, |
192 | [g751] = { |
193 | .default_resolution = 9, |
194 | .default_sample_time = MSEC_PER_SEC / 10, |
195 | }, |
196 | [lm75] = { |
197 | .default_resolution = 9, |
198 | .default_sample_time = MSEC_PER_SEC / 10, |
199 | }, |
200 | [lm75a] = { |
201 | .default_resolution = 9, |
202 | .default_sample_time = MSEC_PER_SEC / 10, |
203 | }, |
204 | [lm75b] = { |
205 | .default_resolution = 11, |
206 | .default_sample_time = MSEC_PER_SEC / 10, |
207 | }, |
208 | [max6625] = { |
209 | .default_resolution = 9, |
210 | .default_sample_time = MSEC_PER_SEC / 7, |
211 | }, |
212 | [max6626] = { |
213 | .default_resolution = 12, |
214 | .default_sample_time = MSEC_PER_SEC / 7, |
215 | .resolution_limits = 9, |
216 | }, |
217 | [max31725] = { |
218 | .default_resolution = 16, |
219 | .default_sample_time = MSEC_PER_SEC / 20, |
220 | }, |
221 | [tcn75] = { |
222 | .default_resolution = 9, |
223 | .default_sample_time = MSEC_PER_SEC / 18, |
224 | }, |
225 | [pct2075] = { |
226 | .default_resolution = 11, |
227 | .default_sample_time = MSEC_PER_SEC / 10, |
228 | .num_sample_times = 31, |
229 | .sample_times = (unsigned int []){ 100, 200, 300, 400, 500, 600, |
230 | 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, |
231 | 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, |
232 | 2800, 2900, 3000, 3100 }, |
233 | }, |
234 | [mcp980x] = { |
235 | .set_mask = 3 << 5, /* 12-bit mode */ |
236 | .clr_mask = 1 << 7, /* not one-shot mode */ |
237 | .default_resolution = 12, |
238 | .resolution_limits = 9, |
239 | .default_sample_time = 240, |
240 | .num_sample_times = 4, |
241 | .sample_times = (unsigned int []){ 30, 60, 120, 240 }, |
242 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
243 | }, |
244 | [tmp100] = { |
245 | .set_mask = 3 << 5, /* 12-bit mode */ |
246 | .clr_mask = 1 << 7, /* not one-shot mode */ |
247 | .default_resolution = 12, |
248 | .default_sample_time = 320, |
249 | .num_sample_times = 4, |
250 | .sample_times = (unsigned int []){ 40, 80, 160, 320 }, |
251 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
252 | }, |
253 | [tmp101] = { |
254 | .set_mask = 3 << 5, /* 12-bit mode */ |
255 | .clr_mask = 1 << 7, /* not one-shot mode */ |
256 | .default_resolution = 12, |
257 | .default_sample_time = 320, |
258 | .num_sample_times = 4, |
259 | .sample_times = (unsigned int []){ 40, 80, 160, 320 }, |
260 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
261 | }, |
262 | [tmp105] = { |
263 | .set_mask = 3 << 5, /* 12-bit mode */ |
264 | .clr_mask = 1 << 7, /* not one-shot mode*/ |
265 | .default_resolution = 12, |
266 | .default_sample_time = 220, |
267 | .num_sample_times = 4, |
268 | .sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
269 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
270 | }, |
271 | [tmp112] = { |
272 | .config_reg_16bits = true, |
273 | .set_mask = 0x60C0, /* 12-bit mode, 8 samples / second */ |
274 | .clr_mask = 1 << 15, /* no one-shot mode*/ |
275 | .default_resolution = 12, |
276 | .default_sample_time = 125, |
277 | .num_sample_times = 4, |
278 | .sample_times = (unsigned int []){ 125, 250, 1000, 4000 }, |
279 | }, |
280 | [tmp175] = { |
281 | .set_mask = 3 << 5, /* 12-bit mode */ |
282 | .clr_mask = 1 << 7, /* not one-shot mode*/ |
283 | .default_resolution = 12, |
284 | .default_sample_time = 220, |
285 | .num_sample_times = 4, |
286 | .sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
287 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
288 | }, |
289 | [tmp275] = { |
290 | .set_mask = 3 << 5, /* 12-bit mode */ |
291 | .clr_mask = 1 << 7, /* not one-shot mode*/ |
292 | .default_resolution = 12, |
293 | .default_sample_time = 220, |
294 | .num_sample_times = 4, |
295 | .sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
296 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
297 | }, |
298 | [tmp75] = { |
299 | .set_mask = 3 << 5, /* 12-bit mode */ |
300 | .clr_mask = 1 << 7, /* not one-shot mode*/ |
301 | .default_resolution = 12, |
302 | .default_sample_time = 220, |
303 | .num_sample_times = 4, |
304 | .sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
305 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
306 | }, |
307 | [tmp75b] = { /* not one-shot mode, Conversion rate 37Hz */ |
308 | .clr_mask = 1 << 7 | 3 << 5, |
309 | .default_resolution = 12, |
310 | .default_sample_time = MSEC_PER_SEC / 37, |
311 | .sample_times = (unsigned int []){ MSEC_PER_SEC / 37, |
312 | MSEC_PER_SEC / 18, |
313 | MSEC_PER_SEC / 9, MSEC_PER_SEC / 4 }, |
314 | .num_sample_times = 4, |
315 | }, |
316 | [tmp75c] = { |
317 | .clr_mask = 1 << 5, /*not one-shot mode*/ |
318 | .default_resolution = 12, |
319 | .default_sample_time = MSEC_PER_SEC / 12, |
320 | }, |
321 | [tmp1075] = { /* not one-shot mode, 27.5 ms sample rate */ |
322 | .clr_mask = 1 << 5 | 1 << 6 | 1 << 7, |
323 | .default_resolution = 12, |
324 | .default_sample_time = 28, |
325 | .num_sample_times = 4, |
326 | .sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
327 | } |
328 | }; |
329 | |
330 | static inline long lm75_reg_to_mc(s16 temp, u8 resolution) |
331 | { |
332 | return ((temp >> (16 - resolution)) * 1000) >> (resolution - 8); |
333 | } |
334 | |
335 | static int lm75_write_config(struct lm75_data *data, u16 set_mask, |
336 | u16 clr_mask) |
337 | { |
338 | unsigned int value; |
339 | |
340 | clr_mask |= LM75_SHUTDOWN << (8 * data->params->config_reg_16bits); |
341 | value = data->current_conf & ~clr_mask; |
342 | value |= set_mask; |
343 | |
344 | if (data->current_conf != value) { |
345 | s32 err; |
346 | if (data->params->config_reg_16bits) |
347 | err = regmap_write(map: data->regmap, LM75_REG_CONF, val: value); |
348 | else |
349 | err = i2c_smbus_write_byte_data(client: data->client, |
350 | LM75_REG_CONF, |
351 | value); |
352 | if (err) |
353 | return err; |
354 | data->current_conf = value; |
355 | } |
356 | return 0; |
357 | } |
358 | |
359 | static int lm75_read_config(struct lm75_data *data) |
360 | { |
361 | int ret; |
362 | unsigned int status; |
363 | |
364 | if (data->params->config_reg_16bits) { |
365 | ret = regmap_read(map: data->regmap, LM75_REG_CONF, val: &status); |
366 | return ret ? ret : status; |
367 | } |
368 | |
369 | return i2c_smbus_read_byte_data(client: data->client, LM75_REG_CONF); |
370 | } |
371 | |
372 | static irqreturn_t lm75_alarm_handler(int irq, void *private) |
373 | { |
374 | struct device *hwmon_dev = private; |
375 | |
376 | hwmon_notify_event(dev: hwmon_dev, type: hwmon_temp, attr: hwmon_temp_alarm, channel: 0); |
377 | return IRQ_HANDLED; |
378 | } |
379 | |
380 | static int lm75_read(struct device *dev, enum hwmon_sensor_types type, |
381 | u32 attr, int channel, long *val) |
382 | { |
383 | struct lm75_data *data = dev_get_drvdata(dev); |
384 | unsigned int regval; |
385 | int err, reg; |
386 | |
387 | switch (type) { |
388 | case hwmon_chip: |
389 | switch (attr) { |
390 | case hwmon_chip_update_interval: |
391 | *val = data->sample_time; |
392 | break; |
393 | default: |
394 | return -EINVAL; |
395 | } |
396 | break; |
397 | case hwmon_temp: |
398 | switch (attr) { |
399 | case hwmon_temp_input: |
400 | reg = LM75_REG_TEMP; |
401 | break; |
402 | case hwmon_temp_max: |
403 | reg = LM75_REG_MAX; |
404 | break; |
405 | case hwmon_temp_max_hyst: |
406 | reg = LM75_REG_HYST; |
407 | break; |
408 | case hwmon_temp_alarm: |
409 | reg = LM75_REG_CONF; |
410 | break; |
411 | default: |
412 | return -EINVAL; |
413 | } |
414 | err = regmap_read(map: data->regmap, reg, val: ®val); |
415 | if (err < 0) |
416 | return err; |
417 | |
418 | if (attr == hwmon_temp_alarm) { |
419 | switch (data->kind) { |
420 | case as6200: |
421 | *val = (regval >> 5) & 0x1; |
422 | break; |
423 | default: |
424 | return -EINVAL; |
425 | } |
426 | } else { |
427 | *val = lm75_reg_to_mc(temp: regval, resolution: data->resolution); |
428 | } |
429 | break; |
430 | default: |
431 | return -EINVAL; |
432 | } |
433 | return 0; |
434 | } |
435 | |
436 | static int lm75_write_temp(struct device *dev, u32 attr, long temp) |
437 | { |
438 | struct lm75_data *data = dev_get_drvdata(dev); |
439 | u8 resolution; |
440 | int reg; |
441 | |
442 | switch (attr) { |
443 | case hwmon_temp_max: |
444 | reg = LM75_REG_MAX; |
445 | break; |
446 | case hwmon_temp_max_hyst: |
447 | reg = LM75_REG_HYST; |
448 | break; |
449 | default: |
450 | return -EINVAL; |
451 | } |
452 | |
453 | /* |
454 | * Resolution of limit registers is assumed to be the same as the |
455 | * temperature input register resolution unless given explicitly. |
456 | */ |
457 | if (data->params->resolution_limits) |
458 | resolution = data->params->resolution_limits; |
459 | else |
460 | resolution = data->resolution; |
461 | |
462 | temp = clamp_val(temp, LM75_TEMP_MIN, LM75_TEMP_MAX); |
463 | temp = DIV_ROUND_CLOSEST(temp << (resolution - 8), |
464 | 1000) << (16 - resolution); |
465 | |
466 | return regmap_write(map: data->regmap, reg, val: (u16)temp); |
467 | } |
468 | |
469 | static int lm75_update_interval(struct device *dev, long val) |
470 | { |
471 | struct lm75_data *data = dev_get_drvdata(dev); |
472 | unsigned int reg; |
473 | u8 index; |
474 | s32 err; |
475 | |
476 | index = find_closest(val, data->params->sample_times, |
477 | (int)data->params->num_sample_times); |
478 | |
479 | switch (data->kind) { |
480 | default: |
481 | err = lm75_write_config(data, set_mask: lm75_sample_set_masks[index], |
482 | LM75_SAMPLE_CLEAR_MASK); |
483 | if (err) |
484 | return err; |
485 | |
486 | data->sample_time = data->params->sample_times[index]; |
487 | if (data->params->resolutions) |
488 | data->resolution = data->params->resolutions[index]; |
489 | break; |
490 | case tmp112: |
491 | case as6200: |
492 | err = regmap_read(map: data->regmap, LM75_REG_CONF, val: ®); |
493 | if (err < 0) |
494 | return err; |
495 | reg &= ~0x00c0; |
496 | reg |= (3 - index) << 6; |
497 | err = regmap_write(map: data->regmap, LM75_REG_CONF, val: reg); |
498 | if (err < 0) |
499 | return err; |
500 | data->sample_time = data->params->sample_times[index]; |
501 | break; |
502 | case pct2075: |
503 | err = i2c_smbus_write_byte_data(client: data->client, PCT2075_REG_IDLE, |
504 | value: index + 1); |
505 | if (err) |
506 | return err; |
507 | data->sample_time = data->params->sample_times[index]; |
508 | break; |
509 | } |
510 | return 0; |
511 | } |
512 | |
513 | static int lm75_write_chip(struct device *dev, u32 attr, long val) |
514 | { |
515 | switch (attr) { |
516 | case hwmon_chip_update_interval: |
517 | return lm75_update_interval(dev, val); |
518 | default: |
519 | return -EINVAL; |
520 | } |
521 | return 0; |
522 | } |
523 | |
524 | static int lm75_write(struct device *dev, enum hwmon_sensor_types type, |
525 | u32 attr, int channel, long val) |
526 | { |
527 | switch (type) { |
528 | case hwmon_chip: |
529 | return lm75_write_chip(dev, attr, val); |
530 | case hwmon_temp: |
531 | return lm75_write_temp(dev, attr, temp: val); |
532 | default: |
533 | return -EINVAL; |
534 | } |
535 | return 0; |
536 | } |
537 | |
538 | static umode_t lm75_is_visible(const void *data, enum hwmon_sensor_types type, |
539 | u32 attr, int channel) |
540 | { |
541 | const struct lm75_data *config_data = data; |
542 | |
543 | switch (type) { |
544 | case hwmon_chip: |
545 | switch (attr) { |
546 | case hwmon_chip_update_interval: |
547 | if (config_data->params->num_sample_times > 1) |
548 | return 0644; |
549 | return 0444; |
550 | } |
551 | break; |
552 | case hwmon_temp: |
553 | switch (attr) { |
554 | case hwmon_temp_input: |
555 | return 0444; |
556 | case hwmon_temp_max: |
557 | case hwmon_temp_max_hyst: |
558 | return 0644; |
559 | case hwmon_temp_alarm: |
560 | if (config_data->params->alarm) |
561 | return 0444; |
562 | break; |
563 | } |
564 | break; |
565 | default: |
566 | break; |
567 | } |
568 | return 0; |
569 | } |
570 | |
571 | static const struct hwmon_channel_info * const lm75_info[] = { |
572 | HWMON_CHANNEL_INFO(chip, |
573 | HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL), |
574 | HWMON_CHANNEL_INFO(temp, |
575 | HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | |
576 | HWMON_T_ALARM), |
577 | NULL |
578 | }; |
579 | |
580 | static const struct hwmon_ops lm75_hwmon_ops = { |
581 | .is_visible = lm75_is_visible, |
582 | .read = lm75_read, |
583 | .write = lm75_write, |
584 | }; |
585 | |
586 | static const struct hwmon_chip_info lm75_chip_info = { |
587 | .ops = &lm75_hwmon_ops, |
588 | .info = lm75_info, |
589 | }; |
590 | |
591 | static bool lm75_is_writeable_reg(struct device *dev, unsigned int reg) |
592 | { |
593 | return reg != LM75_REG_TEMP; |
594 | } |
595 | |
596 | static bool lm75_is_volatile_reg(struct device *dev, unsigned int reg) |
597 | { |
598 | return reg == LM75_REG_TEMP || reg == LM75_REG_CONF; |
599 | } |
600 | |
601 | static const struct regmap_config lm75_regmap_config = { |
602 | .reg_bits = 8, |
603 | .val_bits = 16, |
604 | .max_register = PCT2075_REG_IDLE, |
605 | .writeable_reg = lm75_is_writeable_reg, |
606 | .volatile_reg = lm75_is_volatile_reg, |
607 | .val_format_endian = REGMAP_ENDIAN_BIG, |
608 | .cache_type = REGCACHE_MAPLE, |
609 | .use_single_read = true, |
610 | .use_single_write = true, |
611 | }; |
612 | |
613 | static void lm75_disable_regulator(void *data) |
614 | { |
615 | struct lm75_data *lm75 = data; |
616 | |
617 | regulator_disable(regulator: lm75->vs); |
618 | } |
619 | |
620 | static void lm75_remove(void *data) |
621 | { |
622 | struct lm75_data *lm75 = data; |
623 | struct i2c_client *client = lm75->client; |
624 | |
625 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, value: lm75->orig_conf); |
626 | } |
627 | |
628 | static const struct i2c_device_id lm75_ids[]; |
629 | |
630 | static int lm75_probe(struct i2c_client *client) |
631 | { |
632 | struct device *dev = &client->dev; |
633 | struct device *hwmon_dev; |
634 | struct lm75_data *data; |
635 | int status, err; |
636 | enum lm75_type kind; |
637 | |
638 | if (client->dev.of_node) |
639 | kind = (uintptr_t)of_device_get_match_data(dev: &client->dev); |
640 | else |
641 | kind = i2c_match_id(id: lm75_ids, client)->driver_data; |
642 | |
643 | if (!i2c_check_functionality(adap: client->adapter, |
644 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) |
645 | return -EIO; |
646 | |
647 | data = devm_kzalloc(dev, size: sizeof(struct lm75_data), GFP_KERNEL); |
648 | if (!data) |
649 | return -ENOMEM; |
650 | |
651 | data->client = client; |
652 | data->kind = kind; |
653 | |
654 | data->vs = devm_regulator_get(dev, id: "vs" ); |
655 | if (IS_ERR(ptr: data->vs)) |
656 | return PTR_ERR(ptr: data->vs); |
657 | |
658 | data->regmap = devm_regmap_init_i2c(client, &lm75_regmap_config); |
659 | if (IS_ERR(ptr: data->regmap)) |
660 | return PTR_ERR(ptr: data->regmap); |
661 | |
662 | /* Set to LM75 resolution (9 bits, 1/2 degree C) and range. |
663 | * Then tweak to be more precise when appropriate. |
664 | */ |
665 | |
666 | data->params = &device_params[data->kind]; |
667 | |
668 | /* Save default sample time and resolution*/ |
669 | data->sample_time = data->params->default_sample_time; |
670 | data->resolution = data->params->default_resolution; |
671 | |
672 | /* Enable the power */ |
673 | err = regulator_enable(regulator: data->vs); |
674 | if (err) { |
675 | dev_err(dev, "failed to enable regulator: %d\n" , err); |
676 | return err; |
677 | } |
678 | |
679 | err = devm_add_action_or_reset(dev, lm75_disable_regulator, data); |
680 | if (err) |
681 | return err; |
682 | |
683 | /* Cache original configuration */ |
684 | status = lm75_read_config(data); |
685 | if (status < 0) { |
686 | dev_dbg(dev, "Can't read config? %d\n" , status); |
687 | return status; |
688 | } |
689 | data->orig_conf = status; |
690 | data->current_conf = status; |
691 | |
692 | err = lm75_write_config(data, set_mask: data->params->set_mask, |
693 | clr_mask: data->params->clr_mask); |
694 | if (err) |
695 | return err; |
696 | |
697 | err = devm_add_action_or_reset(dev, lm75_remove, data); |
698 | if (err) |
699 | return err; |
700 | |
701 | hwmon_dev = devm_hwmon_device_register_with_info(dev, name: client->name, |
702 | drvdata: data, info: &lm75_chip_info, |
703 | NULL); |
704 | if (IS_ERR(ptr: hwmon_dev)) |
705 | return PTR_ERR(ptr: hwmon_dev); |
706 | |
707 | if (client->irq) { |
708 | if (data->params->alarm) { |
709 | err = devm_request_threaded_irq(dev, |
710 | irq: client->irq, |
711 | NULL, |
712 | thread_fn: &lm75_alarm_handler, |
713 | IRQF_ONESHOT, |
714 | devname: client->name, |
715 | dev_id: hwmon_dev); |
716 | if (err) |
717 | return err; |
718 | } else { |
719 | /* alarm is only supported for chips with alarm bit */ |
720 | dev_err(dev, "alarm interrupt is not supported\n" ); |
721 | } |
722 | } |
723 | |
724 | dev_info(dev, "%s: sensor '%s'\n" , dev_name(hwmon_dev), client->name); |
725 | |
726 | return 0; |
727 | } |
728 | |
729 | static const struct i2c_device_id lm75_ids[] = { |
730 | { "adt75" , adt75, }, |
731 | { "as6200" , as6200, }, |
732 | { "at30ts74" , at30ts74, }, |
733 | { "ds1775" , ds1775, }, |
734 | { "ds75" , ds75, }, |
735 | { "ds7505" , ds7505, }, |
736 | { "g751" , g751, }, |
737 | { "lm75" , lm75, }, |
738 | { "lm75a" , lm75a, }, |
739 | { "lm75b" , lm75b, }, |
740 | { "max6625" , max6625, }, |
741 | { "max6626" , max6626, }, |
742 | { "max31725" , max31725, }, |
743 | { "max31726" , max31725, }, |
744 | { "mcp980x" , mcp980x, }, |
745 | { "pct2075" , pct2075, }, |
746 | { "stds75" , stds75, }, |
747 | { "stlm75" , stlm75, }, |
748 | { "tcn75" , tcn75, }, |
749 | { "tmp100" , tmp100, }, |
750 | { "tmp101" , tmp101, }, |
751 | { "tmp105" , tmp105, }, |
752 | { "tmp112" , tmp112, }, |
753 | { "tmp175" , tmp175, }, |
754 | { "tmp275" , tmp275, }, |
755 | { "tmp75" , tmp75, }, |
756 | { "tmp75b" , tmp75b, }, |
757 | { "tmp75c" , tmp75c, }, |
758 | { "tmp1075" , tmp1075, }, |
759 | { /* LIST END */ } |
760 | }; |
761 | MODULE_DEVICE_TABLE(i2c, lm75_ids); |
762 | |
763 | static const struct of_device_id __maybe_unused lm75_of_match[] = { |
764 | { |
765 | .compatible = "adi,adt75" , |
766 | .data = (void *)adt75 |
767 | }, |
768 | { |
769 | .compatible = "ams,as6200" , |
770 | .data = (void *)as6200 |
771 | }, |
772 | { |
773 | .compatible = "atmel,at30ts74" , |
774 | .data = (void *)at30ts74 |
775 | }, |
776 | { |
777 | .compatible = "dallas,ds1775" , |
778 | .data = (void *)ds1775 |
779 | }, |
780 | { |
781 | .compatible = "dallas,ds75" , |
782 | .data = (void *)ds75 |
783 | }, |
784 | { |
785 | .compatible = "dallas,ds7505" , |
786 | .data = (void *)ds7505 |
787 | }, |
788 | { |
789 | .compatible = "gmt,g751" , |
790 | .data = (void *)g751 |
791 | }, |
792 | { |
793 | .compatible = "national,lm75" , |
794 | .data = (void *)lm75 |
795 | }, |
796 | { |
797 | .compatible = "national,lm75a" , |
798 | .data = (void *)lm75a |
799 | }, |
800 | { |
801 | .compatible = "national,lm75b" , |
802 | .data = (void *)lm75b |
803 | }, |
804 | { |
805 | .compatible = "maxim,max6625" , |
806 | .data = (void *)max6625 |
807 | }, |
808 | { |
809 | .compatible = "maxim,max6626" , |
810 | .data = (void *)max6626 |
811 | }, |
812 | { |
813 | .compatible = "maxim,max31725" , |
814 | .data = (void *)max31725 |
815 | }, |
816 | { |
817 | .compatible = "maxim,max31726" , |
818 | .data = (void *)max31725 |
819 | }, |
820 | { |
821 | .compatible = "maxim,mcp980x" , |
822 | .data = (void *)mcp980x |
823 | }, |
824 | { |
825 | .compatible = "nxp,pct2075" , |
826 | .data = (void *)pct2075 |
827 | }, |
828 | { |
829 | .compatible = "st,stds75" , |
830 | .data = (void *)stds75 |
831 | }, |
832 | { |
833 | .compatible = "st,stlm75" , |
834 | .data = (void *)stlm75 |
835 | }, |
836 | { |
837 | .compatible = "microchip,tcn75" , |
838 | .data = (void *)tcn75 |
839 | }, |
840 | { |
841 | .compatible = "ti,tmp100" , |
842 | .data = (void *)tmp100 |
843 | }, |
844 | { |
845 | .compatible = "ti,tmp101" , |
846 | .data = (void *)tmp101 |
847 | }, |
848 | { |
849 | .compatible = "ti,tmp105" , |
850 | .data = (void *)tmp105 |
851 | }, |
852 | { |
853 | .compatible = "ti,tmp112" , |
854 | .data = (void *)tmp112 |
855 | }, |
856 | { |
857 | .compatible = "ti,tmp175" , |
858 | .data = (void *)tmp175 |
859 | }, |
860 | { |
861 | .compatible = "ti,tmp275" , |
862 | .data = (void *)tmp275 |
863 | }, |
864 | { |
865 | .compatible = "ti,tmp75" , |
866 | .data = (void *)tmp75 |
867 | }, |
868 | { |
869 | .compatible = "ti,tmp75b" , |
870 | .data = (void *)tmp75b |
871 | }, |
872 | { |
873 | .compatible = "ti,tmp75c" , |
874 | .data = (void *)tmp75c |
875 | }, |
876 | { |
877 | .compatible = "ti,tmp1075" , |
878 | .data = (void *)tmp1075 |
879 | }, |
880 | { }, |
881 | }; |
882 | MODULE_DEVICE_TABLE(of, lm75_of_match); |
883 | |
884 | #define LM75A_ID 0xA1 |
885 | |
886 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
887 | static int lm75_detect(struct i2c_client *new_client, |
888 | struct i2c_board_info *info) |
889 | { |
890 | struct i2c_adapter *adapter = new_client->adapter; |
891 | int i; |
892 | int conf, hyst, os; |
893 | bool is_lm75a = 0; |
894 | |
895 | if (!i2c_check_functionality(adap: adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
896 | I2C_FUNC_SMBUS_WORD_DATA)) |
897 | return -ENODEV; |
898 | |
899 | /* |
900 | * Now, we do the remaining detection. There is no identification- |
901 | * dedicated register so we have to rely on several tricks: |
902 | * unused bits, registers cycling over 8-address boundaries, |
903 | * addresses 0x04-0x07 returning the last read value. |
904 | * The cycling+unused addresses combination is not tested, |
905 | * since it would significantly slow the detection down and would |
906 | * hardly add any value. |
907 | * |
908 | * The National Semiconductor LM75A is different than earlier |
909 | * LM75s. It has an ID byte of 0xaX (where X is the chip |
910 | * revision, with 1 being the only revision in existence) in |
911 | * register 7, and unused registers return 0xff rather than the |
912 | * last read value. |
913 | * |
914 | * Note that this function only detects the original National |
915 | * Semiconductor LM75 and the LM75A. Clones from other vendors |
916 | * aren't detected, on purpose, because they are typically never |
917 | * found on PC hardware. They are found on embedded designs where |
918 | * they can be instantiated explicitly so detection is not needed. |
919 | * The absence of identification registers on all these clones |
920 | * would make their exhaustive detection very difficult and weak, |
921 | * and odds are that the driver would bind to unsupported devices. |
922 | */ |
923 | |
924 | /* Unused bits */ |
925 | conf = i2c_smbus_read_byte_data(client: new_client, command: 1); |
926 | if (conf & 0xe0) |
927 | return -ENODEV; |
928 | |
929 | /* First check for LM75A */ |
930 | if (i2c_smbus_read_byte_data(client: new_client, command: 7) == LM75A_ID) { |
931 | /* |
932 | * LM75A returns 0xff on unused registers so |
933 | * just to be sure we check for that too. |
934 | */ |
935 | if (i2c_smbus_read_byte_data(client: new_client, command: 4) != 0xff |
936 | || i2c_smbus_read_byte_data(client: new_client, command: 5) != 0xff |
937 | || i2c_smbus_read_byte_data(client: new_client, command: 6) != 0xff) |
938 | return -ENODEV; |
939 | is_lm75a = 1; |
940 | hyst = i2c_smbus_read_byte_data(client: new_client, command: 2); |
941 | os = i2c_smbus_read_byte_data(client: new_client, command: 3); |
942 | } else { /* Traditional style LM75 detection */ |
943 | /* Unused addresses */ |
944 | hyst = i2c_smbus_read_byte_data(client: new_client, command: 2); |
945 | if (i2c_smbus_read_byte_data(client: new_client, command: 4) != hyst |
946 | || i2c_smbus_read_byte_data(client: new_client, command: 5) != hyst |
947 | || i2c_smbus_read_byte_data(client: new_client, command: 6) != hyst |
948 | || i2c_smbus_read_byte_data(client: new_client, command: 7) != hyst) |
949 | return -ENODEV; |
950 | os = i2c_smbus_read_byte_data(client: new_client, command: 3); |
951 | if (i2c_smbus_read_byte_data(client: new_client, command: 4) != os |
952 | || i2c_smbus_read_byte_data(client: new_client, command: 5) != os |
953 | || i2c_smbus_read_byte_data(client: new_client, command: 6) != os |
954 | || i2c_smbus_read_byte_data(client: new_client, command: 7) != os) |
955 | return -ENODEV; |
956 | } |
957 | /* |
958 | * It is very unlikely that this is a LM75 if both |
959 | * hysteresis and temperature limit registers are 0. |
960 | */ |
961 | if (hyst == 0 && os == 0) |
962 | return -ENODEV; |
963 | |
964 | /* Addresses cycling */ |
965 | for (i = 8; i <= 248; i += 40) { |
966 | if (i2c_smbus_read_byte_data(client: new_client, command: i + 1) != conf |
967 | || i2c_smbus_read_byte_data(client: new_client, command: i + 2) != hyst |
968 | || i2c_smbus_read_byte_data(client: new_client, command: i + 3) != os) |
969 | return -ENODEV; |
970 | if (is_lm75a && i2c_smbus_read_byte_data(client: new_client, command: i + 7) |
971 | != LM75A_ID) |
972 | return -ENODEV; |
973 | } |
974 | |
975 | strscpy(info->type, is_lm75a ? "lm75a" : "lm75" , I2C_NAME_SIZE); |
976 | |
977 | return 0; |
978 | } |
979 | |
980 | #ifdef CONFIG_PM |
981 | static int lm75_suspend(struct device *dev) |
982 | { |
983 | int status; |
984 | struct i2c_client *client = to_i2c_client(dev); |
985 | |
986 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
987 | if (status < 0) { |
988 | dev_dbg(&client->dev, "Can't read config? %d\n" , status); |
989 | return status; |
990 | } |
991 | status = status | LM75_SHUTDOWN; |
992 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, value: status); |
993 | return 0; |
994 | } |
995 | |
996 | static int lm75_resume(struct device *dev) |
997 | { |
998 | int status; |
999 | struct i2c_client *client = to_i2c_client(dev); |
1000 | |
1001 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
1002 | if (status < 0) { |
1003 | dev_dbg(&client->dev, "Can't read config? %d\n" , status); |
1004 | return status; |
1005 | } |
1006 | status = status & ~LM75_SHUTDOWN; |
1007 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, value: status); |
1008 | return 0; |
1009 | } |
1010 | |
1011 | static const struct dev_pm_ops lm75_dev_pm_ops = { |
1012 | .suspend = lm75_suspend, |
1013 | .resume = lm75_resume, |
1014 | }; |
1015 | #define LM75_DEV_PM_OPS (&lm75_dev_pm_ops) |
1016 | #else |
1017 | #define LM75_DEV_PM_OPS NULL |
1018 | #endif /* CONFIG_PM */ |
1019 | |
1020 | static struct i2c_driver lm75_driver = { |
1021 | .class = I2C_CLASS_HWMON, |
1022 | .driver = { |
1023 | .name = "lm75" , |
1024 | .of_match_table = of_match_ptr(lm75_of_match), |
1025 | .pm = LM75_DEV_PM_OPS, |
1026 | }, |
1027 | .probe = lm75_probe, |
1028 | .id_table = lm75_ids, |
1029 | .detect = lm75_detect, |
1030 | .address_list = normal_i2c, |
1031 | }; |
1032 | |
1033 | module_i2c_driver(lm75_driver); |
1034 | |
1035 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>" ); |
1036 | MODULE_DESCRIPTION("LM75 driver" ); |
1037 | MODULE_LICENSE("GPL" ); |
1038 | |