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/i3c/device.h>
15 #include <linux/hwmon.h>
16 #include <linux/err.h>
17 #include <linux/property.h>
18 #include <linux/regmap.h>
19 #include <linux/util_macros.h>
20 #include <linux/regulator/consumer.h>
21 #include "lm75.h"
22
23 /*
24 * This driver handles the LM75 and compatible digital temperature sensors.
25 */
26
27 enum lm75_type { /* keep sorted in alphabetical order */
28 adt75,
29 as6200,
30 at30ts74,
31 ds1775,
32 ds75,
33 ds7505,
34 g751,
35 lm75,
36 lm75a,
37 lm75b,
38 max6625,
39 max6626,
40 max31725,
41 mcp980x,
42 p3t1750,
43 p3t1755,
44 pct2075,
45 stds75,
46 stlm75,
47 tcn75,
48 tmp100,
49 tmp101,
50 tmp105,
51 tmp112,
52 tmp175,
53 tmp275,
54 tmp75,
55 tmp75b,
56 tmp75c,
57 tmp1075,
58 };
59
60 /**
61 * struct lm75_params - lm75 configuration parameters.
62 * @config_reg_16bits: Configure register size is 2 bytes.
63 * @set_mask: Bits to set in configuration register when configuring
64 * the chip.
65 * @clr_mask: Bits to clear in configuration register when configuring
66 * the chip.
67 * @default_resolution: Default number of bits to represent the temperature
68 * value.
69 * @resolution_limits: Limit register resolution. Optional. Should be set if
70 * the resolution of limit registers does not match the
71 * resolution of the temperature register.
72 * @resolutions: List of resolutions associated with sample times.
73 * Optional. Should be set if num_sample_times is larger
74 * than 1, and if the resolution changes with sample times.
75 * If set, number of entries must match num_sample_times.
76 * @default_sample_time:Sample time to be set by default.
77 * @num_sample_times: Number of possible sample times to be set. Optional.
78 * Should be set if the number of sample times is larger
79 * than one.
80 * @sample_times: All the possible sample times to be set. Mandatory if
81 * num_sample_times is larger than 1. If set, number of
82 * entries must match num_sample_times.
83 * @alarm: Alarm bit is supported.
84 */
85
86 struct lm75_params {
87 bool config_reg_16bits;
88 u16 set_mask;
89 u16 clr_mask;
90 u8 default_resolution;
91 u8 resolution_limits;
92 const u8 *resolutions;
93 unsigned int default_sample_time;
94 u8 num_sample_times;
95 const unsigned int *sample_times;
96 bool alarm;
97 };
98
99 /* Addresses scanned */
100 static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
101 0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
102
103 /* The LM75 registers */
104 #define LM75_REG_TEMP 0x00
105 #define LM75_REG_CONF 0x01
106 #define LM75_REG_HYST 0x02
107 #define LM75_REG_MAX 0x03
108 #define PCT2075_REG_IDLE 0x04
109
110 struct lm75_data {
111 const char *label;
112 struct regmap *regmap;
113 u16 orig_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 u8 reg_buf[1];
119 u8 val_buf[3];
120 };
121
122 /*-----------------------------------------------------------------------*/
123
124 static const u8 lm75_sample_set_masks[] = { 0 << 5, 1 << 5, 2 << 5, 3 << 5 };
125
126 #define LM75_ALERT_POLARITY_HIGH_8_BIT (BIT(2))
127 #define LM75_ALERT_POLARITY_HIGH_16_BIT (BIT(2) << 8)
128 #define LM75_SAMPLE_CLEAR_MASK (3 << 5)
129
130 /* The structure below stores the configuration values of the supported devices.
131 * In case of being supported multiple configurations, the default one must
132 * always be the first element of the array
133 */
134 static const struct lm75_params device_params[] = {
135 [adt75] = {
136 .clr_mask = 1 << 5, /* not one-shot mode */
137 .default_resolution = 12,
138 .default_sample_time = MSEC_PER_SEC / 10,
139 },
140 [as6200] = {
141 .config_reg_16bits = true,
142 .set_mask = 0xC010, /* 8 sample/s, 4 CF */
143 .default_resolution = 12,
144 .default_sample_time = 125,
145 .num_sample_times = 4,
146 .sample_times = (unsigned int []){ 125, 250, 1000, 4000 },
147 .alarm = true,
148 },
149 [at30ts74] = {
150 .set_mask = 3 << 5, /* 12-bit mode*/
151 .default_resolution = 12,
152 .default_sample_time = 200,
153 .num_sample_times = 4,
154 .sample_times = (unsigned int []){ 25, 50, 100, 200 },
155 .resolutions = (u8 []) {9, 10, 11, 12 },
156 },
157 [ds1775] = {
158 .clr_mask = 3 << 5,
159 .set_mask = 2 << 5, /* 11-bit mode */
160 .default_resolution = 11,
161 .default_sample_time = 500,
162 .num_sample_times = 4,
163 .sample_times = (unsigned int []){ 125, 250, 500, 1000 },
164 .resolutions = (u8 []) {9, 10, 11, 12 },
165 },
166 [ds75] = {
167 .clr_mask = 3 << 5,
168 .set_mask = 2 << 5, /* 11-bit mode */
169 .default_resolution = 11,
170 .default_sample_time = 600,
171 .num_sample_times = 4,
172 .sample_times = (unsigned int []){ 150, 300, 600, 1200 },
173 .resolutions = (u8 []) {9, 10, 11, 12 },
174 },
175 [stds75] = {
176 .clr_mask = 3 << 5,
177 .set_mask = 2 << 5, /* 11-bit mode */
178 .default_resolution = 11,
179 .default_sample_time = 600,
180 .num_sample_times = 4,
181 .sample_times = (unsigned int []){ 150, 300, 600, 1200 },
182 .resolutions = (u8 []) {9, 10, 11, 12 },
183 },
184 [stlm75] = {
185 .default_resolution = 9,
186 .default_sample_time = MSEC_PER_SEC / 6,
187 },
188 [ds7505] = {
189 .set_mask = 3 << 5, /* 12-bit mode*/
190 .default_resolution = 12,
191 .default_sample_time = 200,
192 .num_sample_times = 4,
193 .sample_times = (unsigned int []){ 25, 50, 100, 200 },
194 .resolutions = (u8 []) {9, 10, 11, 12 },
195 },
196 [g751] = {
197 .default_resolution = 9,
198 .default_sample_time = MSEC_PER_SEC / 10,
199 },
200 [lm75] = {
201 .default_resolution = 9,
202 .default_sample_time = MSEC_PER_SEC / 10,
203 },
204 [lm75a] = {
205 .default_resolution = 9,
206 .default_sample_time = MSEC_PER_SEC / 10,
207 },
208 [lm75b] = {
209 .default_resolution = 11,
210 .default_sample_time = MSEC_PER_SEC / 10,
211 },
212 [max6625] = {
213 .default_resolution = 9,
214 .default_sample_time = MSEC_PER_SEC / 7,
215 },
216 [max6626] = {
217 .default_resolution = 12,
218 .default_sample_time = MSEC_PER_SEC / 7,
219 .resolution_limits = 9,
220 },
221 [max31725] = {
222 .default_resolution = 16,
223 .default_sample_time = MSEC_PER_SEC / 20,
224 },
225 [tcn75] = {
226 .default_resolution = 9,
227 .default_sample_time = MSEC_PER_SEC / 18,
228 },
229 [p3t1750] = {
230 .clr_mask = 1 << 1 | 1 << 7, /* disable SMBAlert and one-shot */
231 .default_resolution = 12,
232 .default_sample_time = 55,
233 .num_sample_times = 4,
234 .sample_times = (unsigned int []){ 28, 55, 110, 220 },
235 },
236 [p3t1755] = {
237 .clr_mask = 1 << 1 | 1 << 7, /* disable SMBAlert and one-shot */
238 .default_resolution = 12,
239 .default_sample_time = 55,
240 .num_sample_times = 4,
241 .sample_times = (unsigned int []){ 28, 55, 110, 220 },
242 },
243 [pct2075] = {
244 .default_resolution = 11,
245 .default_sample_time = MSEC_PER_SEC / 10,
246 .num_sample_times = 31,
247 .sample_times = (unsigned int []){ 100, 200, 300, 400, 500, 600,
248 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700,
249 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700,
250 2800, 2900, 3000, 3100 },
251 },
252 [mcp980x] = {
253 .set_mask = 3 << 5, /* 12-bit mode */
254 .clr_mask = 1 << 7, /* not one-shot mode */
255 .default_resolution = 12,
256 .resolution_limits = 9,
257 .default_sample_time = 240,
258 .num_sample_times = 4,
259 .sample_times = (unsigned int []){ 30, 60, 120, 240 },
260 .resolutions = (u8 []) {9, 10, 11, 12 },
261 },
262 [tmp100] = {
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 = 320,
267 .num_sample_times = 4,
268 .sample_times = (unsigned int []){ 40, 80, 160, 320 },
269 .resolutions = (u8 []) {9, 10, 11, 12 },
270 },
271 [tmp101] = {
272 .set_mask = 3 << 5, /* 12-bit mode */
273 .clr_mask = 1 << 7, /* not one-shot mode */
274 .default_resolution = 12,
275 .default_sample_time = 320,
276 .num_sample_times = 4,
277 .sample_times = (unsigned int []){ 40, 80, 160, 320 },
278 .resolutions = (u8 []) {9, 10, 11, 12 },
279 },
280 [tmp105] = {
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 [tmp112] = {
290 .config_reg_16bits = true,
291 .set_mask = 0xC060, /* 12-bit mode, 8 samples / second */
292 .clr_mask = 1 << 7, /* no one-shot mode*/
293 .default_resolution = 12,
294 .default_sample_time = 125,
295 .num_sample_times = 4,
296 .sample_times = (unsigned int []){ 125, 250, 1000, 4000 },
297 .alarm = true,
298 },
299 [tmp175] = {
300 .set_mask = 3 << 5, /* 12-bit mode */
301 .clr_mask = 1 << 7, /* not one-shot mode*/
302 .default_resolution = 12,
303 .default_sample_time = 220,
304 .num_sample_times = 4,
305 .sample_times = (unsigned int []){ 28, 55, 110, 220 },
306 .resolutions = (u8 []) {9, 10, 11, 12 },
307 },
308 [tmp275] = {
309 .set_mask = 3 << 5, /* 12-bit mode */
310 .clr_mask = 1 << 7, /* not one-shot mode*/
311 .default_resolution = 12,
312 .default_sample_time = 220,
313 .num_sample_times = 4,
314 .sample_times = (unsigned int []){ 28, 55, 110, 220 },
315 .resolutions = (u8 []) {9, 10, 11, 12 },
316 },
317 [tmp75] = {
318 .set_mask = 3 << 5, /* 12-bit mode */
319 .clr_mask = 1 << 7, /* not one-shot mode*/
320 .default_resolution = 12,
321 .default_sample_time = 220,
322 .num_sample_times = 4,
323 .sample_times = (unsigned int []){ 28, 55, 110, 220 },
324 .resolutions = (u8 []) {9, 10, 11, 12 },
325 },
326 [tmp75b] = { /* not one-shot mode, Conversion rate 37Hz */
327 .clr_mask = 1 << 7 | 3 << 5,
328 .default_resolution = 12,
329 .default_sample_time = MSEC_PER_SEC / 37,
330 .sample_times = (unsigned int []){ MSEC_PER_SEC / 37,
331 MSEC_PER_SEC / 18,
332 MSEC_PER_SEC / 9, MSEC_PER_SEC / 4 },
333 .num_sample_times = 4,
334 },
335 [tmp75c] = {
336 .clr_mask = 1 << 5, /*not one-shot mode*/
337 .default_resolution = 12,
338 .default_sample_time = MSEC_PER_SEC / 12,
339 },
340 [tmp1075] = { /* not one-shot mode, 27.5 ms sample rate */
341 .clr_mask = 1 << 5 | 1 << 6 | 1 << 7,
342 .default_resolution = 12,
343 .default_sample_time = 28,
344 .num_sample_times = 4,
345 .sample_times = (unsigned int []){ 28, 55, 110, 220 },
346 }
347 };
348
lm75_reg_to_mc(s16 temp,u8 resolution)349 static inline long lm75_reg_to_mc(s16 temp, u8 resolution)
350 {
351 return ((temp >> (16 - resolution)) * 1000) >> (resolution - 8);
352 }
353
lm75_write_config(struct lm75_data * data,u16 set_mask,u16 clr_mask)354 static inline int lm75_write_config(struct lm75_data *data, u16 set_mask,
355 u16 clr_mask)
356 {
357 return regmap_update_bits(data->regmap, LM75_REG_CONF,
358 clr_mask | set_mask | LM75_SHUTDOWN, set_mask);
359 }
360
lm75_alarm_handler(int irq,void * private)361 static irqreturn_t lm75_alarm_handler(int irq, void *private)
362 {
363 struct device *hwmon_dev = private;
364
365 hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_alarm, 0);
366 return IRQ_HANDLED;
367 }
368
lm75_read_string(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,const char ** str)369 static int lm75_read_string(struct device *dev, enum hwmon_sensor_types type,
370 u32 attr, int channel, const char **str)
371 {
372 struct lm75_data *data = dev_get_drvdata(dev);
373
374 *str = data->label;
375
376 return 0;
377 }
378
lm75_read(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,long * val)379 static int lm75_read(struct device *dev, enum hwmon_sensor_types type,
380 u32 attr, int channel, long *val)
381 {
382 struct lm75_data *data = dev_get_drvdata(dev);
383 unsigned int regval;
384 int err, reg;
385
386 switch (type) {
387 case hwmon_chip:
388 switch (attr) {
389 case hwmon_chip_update_interval:
390 *val = data->sample_time;
391 break;
392 default:
393 return -EINVAL;
394 }
395 break;
396 case hwmon_temp:
397 switch (attr) {
398 case hwmon_temp_input:
399 reg = LM75_REG_TEMP;
400 break;
401 case hwmon_temp_max:
402 reg = LM75_REG_MAX;
403 break;
404 case hwmon_temp_max_hyst:
405 reg = LM75_REG_HYST;
406 break;
407 case hwmon_temp_alarm:
408 reg = LM75_REG_CONF;
409 break;
410 default:
411 return -EINVAL;
412 }
413 err = regmap_read(data->regmap, reg, ®val);
414 if (err < 0)
415 return err;
416
417 if (attr == hwmon_temp_alarm) {
418 switch (data->kind) {
419 case as6200:
420 case tmp112:
421 *val = !!(regval & BIT(13)) == !!(regval & BIT(2));
422 break;
423 default:
424 return -EINVAL;
425 }
426 } else {
427 *val = lm75_reg_to_mc(regval, data->resolution);
428 }
429 break;
430 default:
431 return -EINVAL;
432 }
433 return 0;
434 }
435
lm75_write_temp(struct device * dev,u32 attr,long temp)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(data->regmap, reg, (u16)temp);
467 }
468
lm75_update_interval(struct device * dev,long val)469 static int lm75_update_interval(struct device *dev, long val)
470 {
471 struct lm75_data *data = dev_get_drvdata(dev);
472 u8 index;
473 s32 err;
474
475 index = find_closest(val, data->params->sample_times,
476 (int)data->params->num_sample_times);
477
478 switch (data->kind) {
479 default:
480 err = lm75_write_config(data, lm75_sample_set_masks[index],
481 LM75_SAMPLE_CLEAR_MASK);
482 if (err)
483 return err;
484
485 data->sample_time = data->params->sample_times[index];
486 if (data->params->resolutions)
487 data->resolution = data->params->resolutions[index];
488 break;
489 case tmp112:
490 case as6200:
491 err = regmap_update_bits(data->regmap, LM75_REG_CONF,
492 0xc000, (3 - index) << 14);
493 if (err < 0)
494 return err;
495 data->sample_time = data->params->sample_times[index];
496 break;
497 case pct2075:
498 err = regmap_write(data->regmap, PCT2075_REG_IDLE, index + 1);
499 if (err)
500 return err;
501 data->sample_time = data->params->sample_times[index];
502 break;
503 }
504 return 0;
505 }
506
lm75_write_chip(struct device * dev,u32 attr,long val)507 static int lm75_write_chip(struct device *dev, u32 attr, long val)
508 {
509 switch (attr) {
510 case hwmon_chip_update_interval:
511 return lm75_update_interval(dev, val);
512 default:
513 return -EINVAL;
514 }
515 return 0;
516 }
517
lm75_write(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,long val)518 static int lm75_write(struct device *dev, enum hwmon_sensor_types type,
519 u32 attr, int channel, long val)
520 {
521 switch (type) {
522 case hwmon_chip:
523 return lm75_write_chip(dev, attr, val);
524 case hwmon_temp:
525 return lm75_write_temp(dev, attr, val);
526 default:
527 return -EINVAL;
528 }
529 return 0;
530 }
531
lm75_is_visible(const void * data,enum hwmon_sensor_types type,u32 attr,int channel)532 static umode_t lm75_is_visible(const void *data, enum hwmon_sensor_types type,
533 u32 attr, int channel)
534 {
535 const struct lm75_data *config_data = data;
536
537 switch (type) {
538 case hwmon_chip:
539 switch (attr) {
540 case hwmon_chip_update_interval:
541 if (config_data->params->num_sample_times > 1)
542 return 0644;
543 return 0444;
544 default:
545 break;
546 }
547 break;
548 case hwmon_temp:
549 switch (attr) {
550 case hwmon_temp_input:
551 return 0444;
552 case hwmon_temp_label:
553 /* Hide label node if label is not provided */
554 return config_data->label ? 0444 : 0;
555 case hwmon_temp_max:
556 case hwmon_temp_max_hyst:
557 return 0644;
558 case hwmon_temp_alarm:
559 if (config_data->params->alarm)
560 return 0444;
561 break;
562 default:
563 break;
564 }
565 break;
566 default:
567 break;
568 }
569 return 0;
570 }
571
572 static const struct hwmon_channel_info * const lm75_info[] = {
573 HWMON_CHANNEL_INFO(chip,
574 HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL),
575 HWMON_CHANNEL_INFO(temp,
576 HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_MAX | HWMON_T_MAX_HYST |
577 HWMON_T_ALARM),
578 NULL
579 };
580
581 static const struct hwmon_ops lm75_hwmon_ops = {
582 .is_visible = lm75_is_visible,
583 .read_string = lm75_read_string,
584 .read = lm75_read,
585 .write = lm75_write,
586 };
587
588 static const struct hwmon_chip_info lm75_chip_info = {
589 .ops = &lm75_hwmon_ops,
590 .info = lm75_info,
591 };
592
lm75_is_writeable_reg(struct device * dev,unsigned int reg)593 static bool lm75_is_writeable_reg(struct device *dev, unsigned int reg)
594 {
595 return reg != LM75_REG_TEMP;
596 }
597
lm75_is_volatile_reg(struct device * dev,unsigned int reg)598 static bool lm75_is_volatile_reg(struct device *dev, unsigned int reg)
599 {
600 return reg == LM75_REG_TEMP || reg == LM75_REG_CONF;
601 }
602
lm75_i2c_reg_read(void * context,unsigned int reg,unsigned int * val)603 static int lm75_i2c_reg_read(void *context, unsigned int reg, unsigned int *val)
604 {
605 struct i2c_client *client = context;
606 struct lm75_data *data = i2c_get_clientdata(client);
607 int ret;
608
609 if (reg == LM75_REG_CONF) {
610 if (!data->params->config_reg_16bits)
611 ret = i2c_smbus_read_byte_data(client, LM75_REG_CONF);
612 else
613 ret = i2c_smbus_read_word_data(client, LM75_REG_CONF);
614 } else {
615 ret = i2c_smbus_read_word_swapped(client, reg);
616 }
617 if (ret < 0)
618 return ret;
619 *val = ret;
620 return 0;
621 }
622
lm75_i2c_reg_write(void * context,unsigned int reg,unsigned int val)623 static int lm75_i2c_reg_write(void *context, unsigned int reg, unsigned int val)
624 {
625 struct i2c_client *client = context;
626 struct lm75_data *data = i2c_get_clientdata(client);
627
628 if (reg == PCT2075_REG_IDLE ||
629 (reg == LM75_REG_CONF && !data->params->config_reg_16bits))
630 return i2c_smbus_write_byte_data(client, reg, val);
631 else if (reg == LM75_REG_CONF)
632 return i2c_smbus_write_word_data(client, reg, val);
633 return i2c_smbus_write_word_swapped(client, reg, val);
634 }
635
636 static const struct regmap_bus lm75_i2c_regmap_bus = {
637 .reg_read = lm75_i2c_reg_read,
638 .reg_write = lm75_i2c_reg_write,
639 };
640
lm75_i3c_reg_read(void * context,unsigned int reg,unsigned int * val)641 static int lm75_i3c_reg_read(void *context, unsigned int reg, unsigned int *val)
642 {
643 struct i3c_device *i3cdev = context;
644 struct lm75_data *data = i3cdev_get_drvdata(i3cdev);
645 struct i3c_xfer xfers[] = {
646 {
647 .rnw = false,
648 .len = 1,
649 .data.out = data->reg_buf,
650 },
651 {
652 .rnw = true,
653 .len = 2,
654 .data.in = data->val_buf,
655 },
656 };
657 int ret;
658
659 data->reg_buf[0] = reg;
660
661 if (reg == LM75_REG_CONF && !data->params->config_reg_16bits)
662 xfers[1].len--;
663
664 ret = i3c_device_do_xfers(i3cdev, xfers, 2, I3C_SDR);
665 if (ret < 0)
666 return ret;
667
668 if (reg == LM75_REG_CONF && !data->params->config_reg_16bits)
669 *val = data->val_buf[0];
670 else if (reg == LM75_REG_CONF)
671 *val = data->val_buf[0] | (data->val_buf[1] << 8);
672 else
673 *val = data->val_buf[1] | (data->val_buf[0] << 8);
674
675 return 0;
676 }
677
lm75_i3c_reg_write(void * context,unsigned int reg,unsigned int val)678 static int lm75_i3c_reg_write(void *context, unsigned int reg, unsigned int val)
679 {
680 struct i3c_device *i3cdev = context;
681 struct lm75_data *data = i3cdev_get_drvdata(i3cdev);
682 struct i3c_xfer xfers[] = {
683 {
684 .rnw = false,
685 .len = 3,
686 .data.out = data->val_buf,
687 },
688 };
689
690 data->val_buf[0] = reg;
691
692 if (reg == PCT2075_REG_IDLE ||
693 (reg == LM75_REG_CONF && !data->params->config_reg_16bits)) {
694 xfers[0].len--;
695 data->val_buf[1] = val & 0xff;
696 } else if (reg == LM75_REG_CONF) {
697 data->val_buf[1] = val & 0xff;
698 data->val_buf[2] = (val >> 8) & 0xff;
699 } else {
700 data->val_buf[1] = (val >> 8) & 0xff;
701 data->val_buf[2] = val & 0xff;
702 }
703
704 return i3c_device_do_xfers(i3cdev, xfers, 1, I3C_SDR);
705 }
706
707 static const struct regmap_bus lm75_i3c_regmap_bus = {
708 .reg_read = lm75_i3c_reg_read,
709 .reg_write = lm75_i3c_reg_write,
710 };
711
712 static const struct regmap_config lm75_regmap_config = {
713 .reg_bits = 8,
714 .val_bits = 16,
715 .max_register = PCT2075_REG_IDLE,
716 .writeable_reg = lm75_is_writeable_reg,
717 .volatile_reg = lm75_is_volatile_reg,
718 .val_format_endian = REGMAP_ENDIAN_BIG,
719 .cache_type = REGCACHE_MAPLE,
720 .use_single_read = true,
721 .use_single_write = true,
722 };
723
lm75_remove(void * data)724 static void lm75_remove(void *data)
725 {
726 struct lm75_data *lm75 = data;
727
728 regmap_write(lm75->regmap, LM75_REG_CONF, lm75->orig_conf);
729 }
730
lm75_generic_probe(struct device * dev,const char * name,enum lm75_type kind,int irq,struct regmap * regmap)731 static int lm75_generic_probe(struct device *dev, const char *name,
732 enum lm75_type kind, int irq, struct regmap *regmap)
733 {
734 u16 clr_mask, pol_mask, set_mask;
735 struct device *hwmon_dev;
736 struct lm75_data *data;
737 int status, err;
738
739 data = devm_kzalloc(dev, sizeof(struct lm75_data), GFP_KERNEL);
740 if (!data)
741 return -ENOMEM;
742
743 /* needed by custom regmap callbacks */
744 dev_set_drvdata(dev, data);
745
746 /* Save the connected input label if available */
747 device_property_read_string(dev, "label", &data->label);
748
749 data->kind = kind;
750 data->regmap = regmap;
751
752 err = devm_regulator_get_enable(dev, "vs");
753 if (err)
754 return err;
755
756 /* Set to LM75 resolution (9 bits, 1/2 degree C) and range.
757 * Then tweak to be more precise when appropriate.
758 */
759
760 data->params = &device_params[data->kind];
761
762 /* Save default sample time and resolution*/
763 data->sample_time = data->params->default_sample_time;
764 data->resolution = data->params->default_resolution;
765
766 /* Cache original configuration */
767 err = regmap_read(data->regmap, LM75_REG_CONF, &status);
768 if (err)
769 return err;
770 data->orig_conf = status;
771
772 /* Enforce polarity active-low (default) or active-high (devicetree) */
773 if (!data->params->config_reg_16bits)
774 pol_mask = LM75_ALERT_POLARITY_HIGH_8_BIT;
775 else
776 pol_mask = LM75_ALERT_POLARITY_HIGH_16_BIT;
777
778 clr_mask = data->params->clr_mask | pol_mask;
779 set_mask = data->params->set_mask & ~pol_mask;
780 if (device_property_read_bool(dev, "ti,alert-polarity-active-high"))
781 set_mask |= pol_mask;
782
783 err = lm75_write_config(data, set_mask, clr_mask);
784 if (err)
785 return err;
786
787 err = devm_add_action_or_reset(dev, lm75_remove, data);
788 if (err)
789 return err;
790
791 hwmon_dev = devm_hwmon_device_register_with_info(dev, name, data,
792 &lm75_chip_info, NULL);
793 if (IS_ERR(hwmon_dev))
794 return PTR_ERR(hwmon_dev);
795
796 if (irq) {
797 if (data->params->alarm) {
798 err = devm_request_threaded_irq(dev,
799 irq,
800 NULL,
801 &lm75_alarm_handler,
802 IRQF_ONESHOT,
803 name,
804 hwmon_dev);
805 if (err)
806 return err;
807 } else {
808 /* alarm is only supported for chips with alarm bit */
809 dev_err(dev, "alarm interrupt is not supported\n");
810 }
811 }
812
813 dev_info(dev, "%s: sensor '%s'\n", dev_name(hwmon_dev), name);
814
815 return 0;
816 }
817
lm75_i2c_probe(struct i2c_client * client)818 static int lm75_i2c_probe(struct i2c_client *client)
819 {
820 struct device *dev = &client->dev;
821 struct regmap *regmap;
822
823 if (!i2c_check_functionality(client->adapter,
824 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
825 return -EOPNOTSUPP;
826
827 regmap = devm_regmap_init(dev, &lm75_i2c_regmap_bus, client, &lm75_regmap_config);
828 if (IS_ERR(regmap))
829 return PTR_ERR(regmap);
830
831 return lm75_generic_probe(dev, client->name, (uintptr_t)i2c_get_match_data(client),
832 client->irq, regmap);
833 }
834
835 static const struct i2c_device_id lm75_i2c_ids[] = {
836 { .name = "adt75", .driver_data = adt75 },
837 { .name = "as6200", .driver_data = as6200 },
838 { .name = "at30ts74", .driver_data = at30ts74 },
839 { .name = "ds1775", .driver_data = ds1775 },
840 { .name = "ds75", .driver_data = ds75 },
841 { .name = "ds7505", .driver_data = ds7505 },
842 { .name = "g751", .driver_data = g751 },
843 { .name = "lm75", .driver_data = lm75 },
844 { .name = "lm75a", .driver_data = lm75a },
845 { .name = "lm75b", .driver_data = lm75b },
846 { .name = "max6625", .driver_data = max6625 },
847 { .name = "max6626", .driver_data = max6626 },
848 { .name = "max31725", .driver_data = max31725 },
849 { .name = "max31726", .driver_data = max31725 },
850 { .name = "mcp980x", .driver_data = mcp980x },
851 { .name = "p3t1750", .driver_data = p3t1750 },
852 { .name = "p3t1755", .driver_data = p3t1755 },
853 { .name = "pct2075", .driver_data = pct2075 },
854 { .name = "stds75", .driver_data = stds75 },
855 { .name = "stlm75", .driver_data = stlm75 },
856 { .name = "tcn75", .driver_data = tcn75 },
857 { .name = "tmp100", .driver_data = tmp100 },
858 { .name = "tmp101", .driver_data = tmp101 },
859 { .name = "tmp105", .driver_data = tmp105 },
860 { .name = "tmp112", .driver_data = tmp112 },
861 { .name = "tmp175", .driver_data = tmp175 },
862 { .name = "tmp275", .driver_data = tmp275 },
863 { .name = "tmp75", .driver_data = tmp75 },
864 { .name = "tmp75b", .driver_data = tmp75b },
865 { .name = "tmp75c", .driver_data = tmp75c },
866 { .name = "tmp1075", .driver_data = tmp1075 },
867 { /* LIST END */ }
868 };
869 MODULE_DEVICE_TABLE(i2c, lm75_i2c_ids);
870
871 struct lm75_i3c_device {
872 enum lm75_type type;
873 const char *name;
874 };
875
876 static const struct lm75_i3c_device lm75_i3c_p3t1755 = {
877 .name = "p3t1755",
878 .type = p3t1755,
879 };
880
881 static const struct i3c_device_id lm75_i3c_ids[] = {
882 I3C_DEVICE(0x011b, 0x152a, &lm75_i3c_p3t1755),
883 { /* LIST END */ }
884 };
885 MODULE_DEVICE_TABLE(i3c, lm75_i3c_ids);
886
lm75_i3c_probe(struct i3c_device * i3cdev)887 static int lm75_i3c_probe(struct i3c_device *i3cdev)
888 {
889 struct device *dev = i3cdev_to_dev(i3cdev);
890 const struct lm75_i3c_device *id_data;
891 struct regmap *regmap;
892
893 regmap = devm_regmap_init(dev, &lm75_i3c_regmap_bus, i3cdev, &lm75_regmap_config);
894 if (IS_ERR(regmap))
895 return PTR_ERR(regmap);
896
897 id_data = i3c_device_match_id(i3cdev, lm75_i3c_ids)->data;
898
899 return lm75_generic_probe(dev, id_data->name, id_data->type, 0, regmap);
900 }
901
902 static const struct of_device_id lm75_of_match[] = {
903 {
904 .compatible = "adi,adt75",
905 .data = (void *)adt75
906 },
907 {
908 .compatible = "ams,as6200",
909 .data = (void *)as6200
910 },
911 {
912 .compatible = "atmel,at30ts74",
913 .data = (void *)at30ts74
914 },
915 {
916 .compatible = "dallas,ds1775",
917 .data = (void *)ds1775
918 },
919 {
920 .compatible = "dallas,ds75",
921 .data = (void *)ds75
922 },
923 {
924 .compatible = "dallas,ds7505",
925 .data = (void *)ds7505
926 },
927 {
928 .compatible = "gmt,g751",
929 .data = (void *)g751
930 },
931 {
932 .compatible = "national,lm75",
933 .data = (void *)lm75
934 },
935 {
936 .compatible = "national,lm75a",
937 .data = (void *)lm75a
938 },
939 {
940 .compatible = "national,lm75b",
941 .data = (void *)lm75b
942 },
943 {
944 .compatible = "maxim,max6625",
945 .data = (void *)max6625
946 },
947 {
948 .compatible = "maxim,max6626",
949 .data = (void *)max6626
950 },
951 {
952 .compatible = "maxim,max31725",
953 .data = (void *)max31725
954 },
955 {
956 .compatible = "maxim,max31726",
957 .data = (void *)max31725
958 },
959 {
960 .compatible = "maxim,mcp980x",
961 .data = (void *)mcp980x
962 },
963 {
964 .compatible = "nxp,p3t1750",
965 .data = (void *)p3t1750
966 },
967 {
968 .compatible = "nxp,p3t1755",
969 .data = (void *)p3t1755
970 },
971 {
972 .compatible = "nxp,pct2075",
973 .data = (void *)pct2075
974 },
975 {
976 .compatible = "st,stds75",
977 .data = (void *)stds75
978 },
979 {
980 .compatible = "st,stlm75",
981 .data = (void *)stlm75
982 },
983 {
984 .compatible = "microchip,tcn75",
985 .data = (void *)tcn75
986 },
987 {
988 .compatible = "ti,tmp100",
989 .data = (void *)tmp100
990 },
991 {
992 .compatible = "ti,tmp101",
993 .data = (void *)tmp101
994 },
995 {
996 .compatible = "ti,tmp105",
997 .data = (void *)tmp105
998 },
999 {
1000 .compatible = "ti,tmp112",
1001 .data = (void *)tmp112
1002 },
1003 {
1004 .compatible = "ti,tmp175",
1005 .data = (void *)tmp175
1006 },
1007 {
1008 .compatible = "ti,tmp275",
1009 .data = (void *)tmp275
1010 },
1011 {
1012 .compatible = "ti,tmp75",
1013 .data = (void *)tmp75
1014 },
1015 {
1016 .compatible = "ti,tmp75b",
1017 .data = (void *)tmp75b
1018 },
1019 {
1020 .compatible = "ti,tmp75c",
1021 .data = (void *)tmp75c
1022 },
1023 {
1024 .compatible = "ti,tmp1075",
1025 .data = (void *)tmp1075
1026 },
1027 { },
1028 };
1029 MODULE_DEVICE_TABLE(of, lm75_of_match);
1030
1031 #define LM75A_ID 0xA1
1032
1033 /* Return 0 if detection is successful, -ENODEV otherwise */
lm75_detect(struct i2c_client * new_client,struct i2c_board_info * info)1034 static int lm75_detect(struct i2c_client *new_client,
1035 struct i2c_board_info *info)
1036 {
1037 struct i2c_adapter *adapter = new_client->adapter;
1038 int i;
1039 int conf, hyst, os;
1040 bool is_lm75a = 0;
1041
1042 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
1043 I2C_FUNC_SMBUS_WORD_DATA))
1044 return -ENODEV;
1045
1046 /*
1047 * Now, we do the remaining detection. There is no identification-
1048 * dedicated register so we have to rely on several tricks:
1049 * unused bits, registers cycling over 8-address boundaries,
1050 * addresses 0x04-0x07 returning the last read value.
1051 * The cycling+unused addresses combination is not tested,
1052 * since it would significantly slow the detection down and would
1053 * hardly add any value.
1054 *
1055 * The National Semiconductor LM75A is different than earlier
1056 * LM75s. It has an ID byte of 0xaX (where X is the chip
1057 * revision, with 1 being the only revision in existence) in
1058 * register 7, and unused registers return 0xff rather than the
1059 * last read value.
1060 *
1061 * Note that this function only detects the original National
1062 * Semiconductor LM75 and the LM75A. Clones from other vendors
1063 * aren't detected, on purpose, because they are typically never
1064 * found on PC hardware. They are found on embedded designs where
1065 * they can be instantiated explicitly so detection is not needed.
1066 * The absence of identification registers on all these clones
1067 * would make their exhaustive detection very difficult and weak,
1068 * and odds are that the driver would bind to unsupported devices.
1069 */
1070
1071 /* Unused bits */
1072 conf = i2c_smbus_read_byte_data(new_client, 1);
1073 if (conf & 0xe0)
1074 return -ENODEV;
1075
1076 /* First check for LM75A */
1077 if (i2c_smbus_read_byte_data(new_client, 7) == LM75A_ID) {
1078 /*
1079 * LM75A returns 0xff on unused registers so
1080 * just to be sure we check for that too.
1081 */
1082 if (i2c_smbus_read_byte_data(new_client, 4) != 0xff
1083 || i2c_smbus_read_byte_data(new_client, 5) != 0xff
1084 || i2c_smbus_read_byte_data(new_client, 6) != 0xff)
1085 return -ENODEV;
1086 is_lm75a = 1;
1087 hyst = i2c_smbus_read_byte_data(new_client, 2);
1088 os = i2c_smbus_read_byte_data(new_client, 3);
1089 } else { /* Traditional style LM75 detection */
1090 /* Unused addresses */
1091 hyst = i2c_smbus_read_byte_data(new_client, 2);
1092 if (i2c_smbus_read_byte_data(new_client, 4) != hyst
1093 || i2c_smbus_read_byte_data(new_client, 5) != hyst
1094 || i2c_smbus_read_byte_data(new_client, 6) != hyst
1095 || i2c_smbus_read_byte_data(new_client, 7) != hyst)
1096 return -ENODEV;
1097 os = i2c_smbus_read_byte_data(new_client, 3);
1098 if (i2c_smbus_read_byte_data(new_client, 4) != os
1099 || i2c_smbus_read_byte_data(new_client, 5) != os
1100 || i2c_smbus_read_byte_data(new_client, 6) != os
1101 || i2c_smbus_read_byte_data(new_client, 7) != os)
1102 return -ENODEV;
1103 }
1104 /*
1105 * It is very unlikely that this is a LM75 if both
1106 * hysteresis and temperature limit registers are 0.
1107 */
1108 if (hyst == 0 && os == 0)
1109 return -ENODEV;
1110
1111 /* Addresses cycling */
1112 for (i = 8; i <= 248; i += 40) {
1113 if (i2c_smbus_read_byte_data(new_client, i + 1) != conf
1114 || i2c_smbus_read_byte_data(new_client, i + 2) != hyst
1115 || i2c_smbus_read_byte_data(new_client, i + 3) != os)
1116 return -ENODEV;
1117 if (is_lm75a && i2c_smbus_read_byte_data(new_client, i + 7)
1118 != LM75A_ID)
1119 return -ENODEV;
1120 }
1121
1122 strscpy(info->type, is_lm75a ? "lm75a" : "lm75", I2C_NAME_SIZE);
1123
1124 return 0;
1125 }
1126
1127 #ifdef CONFIG_PM
lm75_suspend(struct device * dev)1128 static int lm75_suspend(struct device *dev)
1129 {
1130 struct lm75_data *data = dev_get_drvdata(dev);
1131
1132 return regmap_update_bits(data->regmap, LM75_REG_CONF, LM75_SHUTDOWN, LM75_SHUTDOWN);
1133 }
1134
lm75_resume(struct device * dev)1135 static int lm75_resume(struct device *dev)
1136 {
1137 struct lm75_data *data = dev_get_drvdata(dev);
1138
1139 return regmap_update_bits(data->regmap, LM75_REG_CONF, LM75_SHUTDOWN, 0);
1140 }
1141
1142 static const struct dev_pm_ops lm75_dev_pm_ops = {
1143 .suspend = lm75_suspend,
1144 .resume = lm75_resume,
1145 };
1146 #define LM75_DEV_PM_OPS (&lm75_dev_pm_ops)
1147 #else
1148 #define LM75_DEV_PM_OPS NULL
1149 #endif /* CONFIG_PM */
1150
1151 static struct i2c_driver lm75_i2c_driver = {
1152 .class = I2C_CLASS_HWMON,
1153 .driver = {
1154 .name = "lm75",
1155 .of_match_table = lm75_of_match,
1156 .pm = LM75_DEV_PM_OPS,
1157 },
1158 .probe = lm75_i2c_probe,
1159 .id_table = lm75_i2c_ids,
1160 .detect = lm75_detect,
1161 .address_list = normal_i2c,
1162 };
1163
1164 static struct i3c_driver lm75_i3c_driver = {
1165 .driver = {
1166 .name = "lm75_i3c",
1167 },
1168 .probe = lm75_i3c_probe,
1169 .id_table = lm75_i3c_ids,
1170 };
1171
1172 module_i3c_i2c_driver(lm75_i3c_driver, &lm75_i2c_driver)
1173
1174 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
1175 MODULE_DESCRIPTION("LM75 driver");
1176 MODULE_LICENSE("GPL");
1177