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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Driver for Texas Instruments / National Semiconductor LM95234
4 *
5 * Copyright (c) 2013, 2014 Guenter Roeck <linux@roeck-us.net>
6 *
7 * Derived from lm95241.c
8 * Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com>
9 */
10
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/slab.h>
14#include <linux/jiffies.h>
15#include <linux/i2c.h>
16#include <linux/hwmon.h>
17#include <linux/hwmon-sysfs.h>
18#include <linux/err.h>
19#include <linux/mutex.h>
20#include <linux/sysfs.h>
21
22#define DRVNAME "lm95234"
23
24enum chips { lm95233, lm95234 };
25
26static const unsigned short normal_i2c[] = {
27 0x18, 0x2a, 0x2b, 0x4d, 0x4e, I2C_CLIENT_END };
28
29/* LM95234 registers */
30#define LM95234_REG_MAN_ID 0xFE
31#define LM95234_REG_CHIP_ID 0xFF
32#define LM95234_REG_STATUS 0x02
33#define LM95234_REG_CONFIG 0x03
34#define LM95234_REG_CONVRATE 0x04
35#define LM95234_REG_STS_FAULT 0x07
36#define LM95234_REG_STS_TCRIT1 0x08
37#define LM95234_REG_STS_TCRIT2 0x09
38#define LM95234_REG_TEMPH(x) ((x) + 0x10)
39#define LM95234_REG_TEMPL(x) ((x) + 0x20)
40#define LM95234_REG_UTEMPH(x) ((x) + 0x19) /* Remote only */
41#define LM95234_REG_UTEMPL(x) ((x) + 0x29)
42#define LM95234_REG_REM_MODEL 0x30
43#define LM95234_REG_REM_MODEL_STS 0x38
44#define LM95234_REG_OFFSET(x) ((x) + 0x31) /* Remote only */
45#define LM95234_REG_TCRIT1(x) ((x) + 0x40)
46#define LM95234_REG_TCRIT2(x) ((x) + 0x49) /* Remote channel 1,2 */
47#define LM95234_REG_TCRIT_HYST 0x5a
48
49#define NATSEMI_MAN_ID 0x01
50#define LM95233_CHIP_ID 0x89
51#define LM95234_CHIP_ID 0x79
52
53/* Client data (each client gets its own) */
54struct lm95234_data {
55 struct i2c_client *client;
56 const struct attribute_group *groups[3];
57 struct mutex update_lock;
58 unsigned long last_updated, interval; /* in jiffies */
59 bool valid; /* false until following fields are valid */
60 /* registers values */
61 int temp[5]; /* temperature (signed) */
62 u32 status; /* fault/alarm status */
63 u8 tcrit1[5]; /* critical temperature limit */
64 u8 tcrit2[2]; /* high temperature limit */
65 s8 toffset[4]; /* remote temperature offset */
66 u8 thyst; /* common hysteresis */
67
68 u8 sensor_type; /* temperature sensor type */
69};
70
71static int lm95234_read_temp(struct i2c_client *client, int index, int *t)
72{
73 int val;
74 u16 temp = 0;
75
76 if (index) {
77 val = i2c_smbus_read_byte_data(client,
78 LM95234_REG_UTEMPH(index - 1));
79 if (val < 0)
80 return val;
81 temp = val << 8;
82 val = i2c_smbus_read_byte_data(client,
83 LM95234_REG_UTEMPL(index - 1));
84 if (val < 0)
85 return val;
86 temp |= val;
87 *t = temp;
88 }
89 /*
90 * Read signed temperature if unsigned temperature is 0,
91 * or if this is the local sensor.
92 */
93 if (!temp) {
94 val = i2c_smbus_read_byte_data(client,
95 LM95234_REG_TEMPH(index));
96 if (val < 0)
97 return val;
98 temp = val << 8;
99 val = i2c_smbus_read_byte_data(client,
100 LM95234_REG_TEMPL(index));
101 if (val < 0)
102 return val;
103 temp |= val;
104 *t = (s16)temp;
105 }
106 return 0;
107}
108
109static u16 update_intervals[] = { 143, 364, 1000, 2500 };
110
111/* Fill value cache. Must be called with update lock held. */
112
113static int lm95234_fill_cache(struct lm95234_data *data,
114 struct i2c_client *client)
115{
116 int i, ret;
117
118 ret = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE);
119 if (ret < 0)
120 return ret;
121
122 data->interval = msecs_to_jiffies(update_intervals[ret & 0x03]);
123
124 for (i = 0; i < ARRAY_SIZE(data->tcrit1); i++) {
125 ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT1(i));
126 if (ret < 0)
127 return ret;
128 data->tcrit1[i] = ret;
129 }
130 for (i = 0; i < ARRAY_SIZE(data->tcrit2); i++) {
131 ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT2(i));
132 if (ret < 0)
133 return ret;
134 data->tcrit2[i] = ret;
135 }
136 for (i = 0; i < ARRAY_SIZE(data->toffset); i++) {
137 ret = i2c_smbus_read_byte_data(client, LM95234_REG_OFFSET(i));
138 if (ret < 0)
139 return ret;
140 data->toffset[i] = ret;
141 }
142
143 ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT_HYST);
144 if (ret < 0)
145 return ret;
146 data->thyst = ret;
147
148 ret = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
149 if (ret < 0)
150 return ret;
151 data->sensor_type = ret;
152
153 return 0;
154}
155
156static int lm95234_update_device(struct lm95234_data *data)
157{
158 struct i2c_client *client = data->client;
159 int ret;
160
161 mutex_lock(&data->update_lock);
162
163 if (time_after(jiffies, data->last_updated + data->interval) ||
164 !data->valid) {
165 int i;
166
167 if (!data->valid) {
168 ret = lm95234_fill_cache(data, client);
169 if (ret < 0)
170 goto abort;
171 }
172
173 data->valid = false;
174 for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
175 ret = lm95234_read_temp(client, i, &data->temp[i]);
176 if (ret < 0)
177 goto abort;
178 }
179
180 ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_FAULT);
181 if (ret < 0)
182 goto abort;
183 data->status = ret;
184
185 ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_TCRIT1);
186 if (ret < 0)
187 goto abort;
188 data->status |= ret << 8;
189
190 ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_TCRIT2);
191 if (ret < 0)
192 goto abort;
193 data->status |= ret << 16;
194
195 data->last_updated = jiffies;
196 data->valid = true;
197 }
198 ret = 0;
199abort:
200 mutex_unlock(&data->update_lock);
201
202 return ret;
203}
204
205static ssize_t temp_show(struct device *dev, struct device_attribute *attr,
206 char *buf)
207{
208 struct lm95234_data *data = dev_get_drvdata(dev);
209 int index = to_sensor_dev_attr(attr)->index;
210 int ret = lm95234_update_device(data);
211
212 if (ret)
213 return ret;
214
215 return sprintf(buf, "%d\n",
216 DIV_ROUND_CLOSEST(data->temp[index] * 125, 32));
217}
218
219static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
220 char *buf)
221{
222 struct lm95234_data *data = dev_get_drvdata(dev);
223 u32 mask = to_sensor_dev_attr(attr)->index;
224 int ret = lm95234_update_device(data);
225
226 if (ret)
227 return ret;
228
229 return sprintf(buf, "%u", !!(data->status & mask));
230}
231
232static ssize_t type_show(struct device *dev, struct device_attribute *attr,
233 char *buf)
234{
235 struct lm95234_data *data = dev_get_drvdata(dev);
236 u8 mask = to_sensor_dev_attr(attr)->index;
237 int ret = lm95234_update_device(data);
238
239 if (ret)
240 return ret;
241
242 return sprintf(buf, data->sensor_type & mask ? "1\n" : "2\n");
243}
244
245static ssize_t type_store(struct device *dev, struct device_attribute *attr,
246 const char *buf, size_t count)
247{
248 struct lm95234_data *data = dev_get_drvdata(dev);
249 unsigned long val;
250 u8 mask = to_sensor_dev_attr(attr)->index;
251 int ret = lm95234_update_device(data);
252
253 if (ret)
254 return ret;
255
256 ret = kstrtoul(buf, 10, &val);
257 if (ret < 0)
258 return ret;
259
260 if (val != 1 && val != 2)
261 return -EINVAL;
262
263 mutex_lock(&data->update_lock);
264 if (val == 1)
265 data->sensor_type |= mask;
266 else
267 data->sensor_type &= ~mask;
268 data->valid = false;
269 i2c_smbus_write_byte_data(data->client, LM95234_REG_REM_MODEL,
270 data->sensor_type);
271 mutex_unlock(&data->update_lock);
272
273 return count;
274}
275
276static ssize_t tcrit2_show(struct device *dev, struct device_attribute *attr,
277 char *buf)
278{
279 struct lm95234_data *data = dev_get_drvdata(dev);
280 int index = to_sensor_dev_attr(attr)->index;
281 int ret = lm95234_update_device(data);
282
283 if (ret)
284 return ret;
285
286 return sprintf(buf, "%u", data->tcrit2[index] * 1000);
287}
288
289static ssize_t tcrit2_store(struct device *dev, struct device_attribute *attr,
290 const char *buf, size_t count)
291{
292 struct lm95234_data *data = dev_get_drvdata(dev);
293 int index = to_sensor_dev_attr(attr)->index;
294 long val;
295 int ret = lm95234_update_device(data);
296
297 if (ret)
298 return ret;
299
300 ret = kstrtol(buf, 10, &val);
301 if (ret < 0)
302 return ret;
303
304 val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, index ? 255 : 127);
305
306 mutex_lock(&data->update_lock);
307 data->tcrit2[index] = val;
308 i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT2(index), val);
309 mutex_unlock(&data->update_lock);
310
311 return count;
312}
313
314static ssize_t tcrit2_hyst_show(struct device *dev,
315 struct device_attribute *attr, char *buf)
316{
317 struct lm95234_data *data = dev_get_drvdata(dev);
318 int index = to_sensor_dev_attr(attr)->index;
319 int ret = lm95234_update_device(data);
320
321 if (ret)
322 return ret;
323
324 /* Result can be negative, so be careful with unsigned operands */
325 return sprintf(buf, "%d",
326 ((int)data->tcrit2[index] - (int)data->thyst) * 1000);
327}
328
329static ssize_t tcrit1_show(struct device *dev, struct device_attribute *attr,
330 char *buf)
331{
332 struct lm95234_data *data = dev_get_drvdata(dev);
333 int index = to_sensor_dev_attr(attr)->index;
334
335 return sprintf(buf, "%u", data->tcrit1[index] * 1000);
336}
337
338static ssize_t tcrit1_store(struct device *dev, struct device_attribute *attr,
339 const char *buf, size_t count)
340{
341 struct lm95234_data *data = dev_get_drvdata(dev);
342 int index = to_sensor_dev_attr(attr)->index;
343 int ret = lm95234_update_device(data);
344 long val;
345
346 if (ret)
347 return ret;
348
349 ret = kstrtol(buf, 10, &val);
350 if (ret < 0)
351 return ret;
352
353 val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 255);
354
355 mutex_lock(&data->update_lock);
356 data->tcrit1[index] = val;
357 i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT1(index), val);
358 mutex_unlock(&data->update_lock);
359
360 return count;
361}
362
363static ssize_t tcrit1_hyst_show(struct device *dev,
364 struct device_attribute *attr, char *buf)
365{
366 struct lm95234_data *data = dev_get_drvdata(dev);
367 int index = to_sensor_dev_attr(attr)->index;
368 int ret = lm95234_update_device(data);
369
370 if (ret)
371 return ret;
372
373 /* Result can be negative, so be careful with unsigned operands */
374 return sprintf(buf, "%d",
375 ((int)data->tcrit1[index] - (int)data->thyst) * 1000);
376}
377
378static ssize_t tcrit1_hyst_store(struct device *dev,
379 struct device_attribute *attr,
380 const char *buf, size_t count)
381{
382 struct lm95234_data *data = dev_get_drvdata(dev);
383 int index = to_sensor_dev_attr(attr)->index;
384 int ret = lm95234_update_device(data);
385 long val;
386
387 if (ret)
388 return ret;
389
390 ret = kstrtol(buf, 10, &val);
391 if (ret < 0)
392 return ret;
393
394 val = DIV_ROUND_CLOSEST(val, 1000);
395 val = clamp_val((int)data->tcrit1[index] - val, 0, 31);
396
397 mutex_lock(&data->update_lock);
398 data->thyst = val;
399 i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT_HYST, val);
400 mutex_unlock(&data->update_lock);
401
402 return count;
403}
404
405static ssize_t offset_show(struct device *dev, struct device_attribute *attr,
406 char *buf)
407{
408 struct lm95234_data *data = dev_get_drvdata(dev);
409 int index = to_sensor_dev_attr(attr)->index;
410 int ret = lm95234_update_device(data);
411
412 if (ret)
413 return ret;
414
415 return sprintf(buf, "%d", data->toffset[index] * 500);
416}
417
418static ssize_t offset_store(struct device *dev, struct device_attribute *attr,
419 const char *buf, size_t count)
420{
421 struct lm95234_data *data = dev_get_drvdata(dev);
422 int index = to_sensor_dev_attr(attr)->index;
423 int ret = lm95234_update_device(data);
424 long val;
425
426 if (ret)
427 return ret;
428
429 ret = kstrtol(buf, 10, &val);
430 if (ret < 0)
431 return ret;
432
433 /* Accuracy is 1/2 degrees C */
434 val = clamp_val(DIV_ROUND_CLOSEST(val, 500), -128, 127);
435
436 mutex_lock(&data->update_lock);
437 data->toffset[index] = val;
438 i2c_smbus_write_byte_data(data->client, LM95234_REG_OFFSET(index), val);
439 mutex_unlock(&data->update_lock);
440
441 return count;
442}
443
444static ssize_t update_interval_show(struct device *dev,
445 struct device_attribute *attr, char *buf)
446{
447 struct lm95234_data *data = dev_get_drvdata(dev);
448 int ret = lm95234_update_device(data);
449
450 if (ret)
451 return ret;
452
453 return sprintf(buf, "%lu\n",
454 DIV_ROUND_CLOSEST(data->interval * 1000, HZ));
455}
456
457static ssize_t update_interval_store(struct device *dev,
458 struct device_attribute *attr,
459 const char *buf, size_t count)
460{
461 struct lm95234_data *data = dev_get_drvdata(dev);
462 int ret = lm95234_update_device(data);
463 unsigned long val;
464 u8 regval;
465
466 if (ret)
467 return ret;
468
469 ret = kstrtoul(buf, 10, &val);
470 if (ret < 0)
471 return ret;
472
473 for (regval = 0; regval < 3; regval++) {
474 if (val <= update_intervals[regval])
475 break;
476 }
477
478 mutex_lock(&data->update_lock);
479 data->interval = msecs_to_jiffies(update_intervals[regval]);
480 i2c_smbus_write_byte_data(data->client, LM95234_REG_CONVRATE, regval);
481 mutex_unlock(&data->update_lock);
482
483 return count;
484}
485
486static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
487static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
488static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
489static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
490static SENSOR_DEVICE_ATTR_RO(temp5_input, temp, 4);
491
492static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, BIT(0) | BIT(1));
493static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, BIT(2) | BIT(3));
494static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, BIT(4) | BIT(5));
495static SENSOR_DEVICE_ATTR_RO(temp5_fault, alarm, BIT(6) | BIT(7));
496
497static SENSOR_DEVICE_ATTR_RW(temp2_type, type, BIT(1));
498static SENSOR_DEVICE_ATTR_RW(temp3_type, type, BIT(2));
499static SENSOR_DEVICE_ATTR_RW(temp4_type, type, BIT(3));
500static SENSOR_DEVICE_ATTR_RW(temp5_type, type, BIT(4));
501
502static SENSOR_DEVICE_ATTR_RW(temp1_max, tcrit1, 0);
503static SENSOR_DEVICE_ATTR_RW(temp2_max, tcrit2, 0);
504static SENSOR_DEVICE_ATTR_RW(temp3_max, tcrit2, 1);
505static SENSOR_DEVICE_ATTR_RW(temp4_max, tcrit1, 3);
506static SENSOR_DEVICE_ATTR_RW(temp5_max, tcrit1, 4);
507
508static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, tcrit1_hyst, 0);
509static SENSOR_DEVICE_ATTR_RO(temp2_max_hyst, tcrit2_hyst, 0);
510static SENSOR_DEVICE_ATTR_RO(temp3_max_hyst, tcrit2_hyst, 1);
511static SENSOR_DEVICE_ATTR_RO(temp4_max_hyst, tcrit1_hyst, 3);
512static SENSOR_DEVICE_ATTR_RO(temp5_max_hyst, tcrit1_hyst, 4);
513
514static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, BIT(0 + 8));
515static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, BIT(1 + 16));
516static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, BIT(2 + 16));
517static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, BIT(3 + 8));
518static SENSOR_DEVICE_ATTR_RO(temp5_max_alarm, alarm, BIT(4 + 8));
519
520static SENSOR_DEVICE_ATTR_RW(temp2_crit, tcrit1, 1);
521static SENSOR_DEVICE_ATTR_RW(temp3_crit, tcrit1, 2);
522
523static SENSOR_DEVICE_ATTR_RO(temp2_crit_hyst, tcrit1_hyst, 1);
524static SENSOR_DEVICE_ATTR_RO(temp3_crit_hyst, tcrit1_hyst, 2);
525
526static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, BIT(1 + 8));
527static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, BIT(2 + 8));
528
529static SENSOR_DEVICE_ATTR_RW(temp2_offset, offset, 0);
530static SENSOR_DEVICE_ATTR_RW(temp3_offset, offset, 1);
531static SENSOR_DEVICE_ATTR_RW(temp4_offset, offset, 2);
532static SENSOR_DEVICE_ATTR_RW(temp5_offset, offset, 3);
533
534static DEVICE_ATTR_RW(update_interval);
535
536static struct attribute *lm95234_common_attrs[] = {
537 &sensor_dev_attr_temp1_input.dev_attr.attr,
538 &sensor_dev_attr_temp2_input.dev_attr.attr,
539 &sensor_dev_attr_temp3_input.dev_attr.attr,
540 &sensor_dev_attr_temp2_fault.dev_attr.attr,
541 &sensor_dev_attr_temp3_fault.dev_attr.attr,
542 &sensor_dev_attr_temp2_type.dev_attr.attr,
543 &sensor_dev_attr_temp3_type.dev_attr.attr,
544 &sensor_dev_attr_temp1_max.dev_attr.attr,
545 &sensor_dev_attr_temp2_max.dev_attr.attr,
546 &sensor_dev_attr_temp3_max.dev_attr.attr,
547 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
548 &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
549 &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
550 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
551 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
552 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
553 &sensor_dev_attr_temp2_crit.dev_attr.attr,
554 &sensor_dev_attr_temp3_crit.dev_attr.attr,
555 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
556 &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
557 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
558 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
559 &sensor_dev_attr_temp2_offset.dev_attr.attr,
560 &sensor_dev_attr_temp3_offset.dev_attr.attr,
561 &dev_attr_update_interval.attr,
562 NULL
563};
564
565static const struct attribute_group lm95234_common_group = {
566 .attrs = lm95234_common_attrs,
567};
568
569static struct attribute *lm95234_attrs[] = {
570 &sensor_dev_attr_temp4_input.dev_attr.attr,
571 &sensor_dev_attr_temp5_input.dev_attr.attr,
572 &sensor_dev_attr_temp4_fault.dev_attr.attr,
573 &sensor_dev_attr_temp5_fault.dev_attr.attr,
574 &sensor_dev_attr_temp4_type.dev_attr.attr,
575 &sensor_dev_attr_temp5_type.dev_attr.attr,
576 &sensor_dev_attr_temp4_max.dev_attr.attr,
577 &sensor_dev_attr_temp5_max.dev_attr.attr,
578 &sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
579 &sensor_dev_attr_temp5_max_hyst.dev_attr.attr,
580 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
581 &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
582 &sensor_dev_attr_temp4_offset.dev_attr.attr,
583 &sensor_dev_attr_temp5_offset.dev_attr.attr,
584 NULL
585};
586
587static const struct attribute_group lm95234_group = {
588 .attrs = lm95234_attrs,
589};
590
591static int lm95234_detect(struct i2c_client *client,
592 struct i2c_board_info *info)
593{
594 struct i2c_adapter *adapter = client->adapter;
595 int address = client->addr;
596 u8 config_mask, model_mask;
597 int mfg_id, chip_id, val;
598 const char *name;
599
600 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
601 return -ENODEV;
602
603 mfg_id = i2c_smbus_read_byte_data(client, LM95234_REG_MAN_ID);
604 if (mfg_id != NATSEMI_MAN_ID)
605 return -ENODEV;
606
607 chip_id = i2c_smbus_read_byte_data(client, LM95234_REG_CHIP_ID);
608 switch (chip_id) {
609 case LM95233_CHIP_ID:
610 if (address != 0x18 && address != 0x2a && address != 0x2b)
611 return -ENODEV;
612 config_mask = 0xbf;
613 model_mask = 0xf9;
614 name = "lm95233";
615 break;
616 case LM95234_CHIP_ID:
617 if (address != 0x18 && address != 0x4d && address != 0x4e)
618 return -ENODEV;
619 config_mask = 0xbc;
620 model_mask = 0xe1;
621 name = "lm95234";
622 break;
623 default:
624 return -ENODEV;
625 }
626
627 val = i2c_smbus_read_byte_data(client, LM95234_REG_STATUS);
628 if (val & 0x30)
629 return -ENODEV;
630
631 val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG);
632 if (val & config_mask)
633 return -ENODEV;
634
635 val = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE);
636 if (val & 0xfc)
637 return -ENODEV;
638
639 val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
640 if (val & model_mask)
641 return -ENODEV;
642
643 val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS);
644 if (val & model_mask)
645 return -ENODEV;
646
647 strscpy(info->type, name, I2C_NAME_SIZE);
648 return 0;
649}
650
651static int lm95234_init_client(struct i2c_client *client)
652{
653 int val, model;
654
655 /* start conversion if necessary */
656 val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG);
657 if (val < 0)
658 return val;
659 if (val & 0x40)
660 i2c_smbus_write_byte_data(client, LM95234_REG_CONFIG,
661 val & ~0x40);
662
663 /* If diode type status reports an error, try to fix it */
664 val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS);
665 if (val < 0)
666 return val;
667 model = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
668 if (model < 0)
669 return model;
670 if (model & val) {
671 dev_notice(&client->dev,
672 "Fixing remote diode type misconfiguration (0x%x)\n",
673 val);
674 i2c_smbus_write_byte_data(client, LM95234_REG_REM_MODEL,
675 model & ~val);
676 }
677 return 0;
678}
679
680static const struct i2c_device_id lm95234_id[];
681
682static int lm95234_probe(struct i2c_client *client)
683{
684 struct device *dev = &client->dev;
685 struct lm95234_data *data;
686 struct device *hwmon_dev;
687 int err;
688
689 data = devm_kzalloc(dev, sizeof(struct lm95234_data), GFP_KERNEL);
690 if (!data)
691 return -ENOMEM;
692
693 data->client = client;
694 mutex_init(&data->update_lock);
695
696 /* Initialize the LM95234 chip */
697 err = lm95234_init_client(client);
698 if (err < 0)
699 return err;
700
701 data->groups[0] = &lm95234_common_group;
702 if (i2c_match_id(lm95234_id, client)->driver_data == lm95234)
703 data->groups[1] = &lm95234_group;
704
705 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
706 data, data->groups);
707 return PTR_ERR_OR_ZERO(hwmon_dev);
708}
709
710/* Driver data (common to all clients) */
711static const struct i2c_device_id lm95234_id[] = {
712 { "lm95233", lm95233 },
713 { "lm95234", lm95234 },
714 { }
715};
716MODULE_DEVICE_TABLE(i2c, lm95234_id);
717
718static struct i2c_driver lm95234_driver = {
719 .class = I2C_CLASS_HWMON,
720 .driver = {
721 .name = DRVNAME,
722 },
723 .probe = lm95234_probe,
724 .id_table = lm95234_id,
725 .detect = lm95234_detect,
726 .address_list = normal_i2c,
727};
728
729module_i2c_driver(lm95234_driver);
730
731MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
732MODULE_DESCRIPTION("LM95233/LM95234 sensor driver");
733MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Driver for Texas Instruments / National Semiconductor LM95234
4 *
5 * Copyright (c) 2013, 2014 Guenter Roeck <linux@roeck-us.net>
6 *
7 * Derived from lm95241.c
8 * Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com>
9 */
10
11#include <linux/err.h>
12#include <linux/hwmon.h>
13#include <linux/i2c.h>
14#include <linux/init.h>
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/mutex.h>
18#include <linux/regmap.h>
19#include <linux/util_macros.h>
20
21#define DRVNAME "lm95234"
22
23enum chips { lm95233, lm95234 };
24
25static const unsigned short normal_i2c[] = {
26 0x18, 0x2a, 0x2b, 0x4d, 0x4e, I2C_CLIENT_END };
27
28/* LM95234 registers */
29#define LM95234_REG_MAN_ID 0xFE
30#define LM95234_REG_CHIP_ID 0xFF
31#define LM95234_REG_STATUS 0x02
32#define LM95234_REG_CONFIG 0x03
33#define LM95234_REG_CONVRATE 0x04
34#define LM95234_REG_ENABLE 0x05
35#define LM95234_REG_FILTER 0x06
36#define LM95234_REG_STS_FAULT 0x07
37#define LM95234_REG_STS_TCRIT1 0x08
38#define LM95234_REG_STS_TCRIT2 0x09
39#define LM95234_REG_TEMPH(x) ((x) + 0x10)
40#define LM95234_REG_TEMPL(x) ((x) + 0x20)
41#define LM95234_REG_UTEMPH(x) ((x) + 0x19) /* Remote only */
42#define LM95234_REG_UTEMPL(x) ((x) + 0x29)
43#define LM95234_REG_REM_MODEL 0x30
44#define LM95234_REG_REM_MODEL_STS 0x38
45#define LM95234_REG_OFFSET(x) ((x) + 0x31) /* Remote only */
46#define LM95234_REG_TCRIT1(x) ((x) + 0x40)
47#define LM95234_REG_TCRIT2(x) ((x) + 0x49) /* Remote channel 1,2 */
48#define LM95234_REG_TCRIT_HYST 0x5a
49
50#define NATSEMI_MAN_ID 0x01
51#define LM95233_CHIP_ID 0x89
52#define LM95234_CHIP_ID 0x79
53
54/* Client data (each client gets its own) */
55struct lm95234_data {
56 struct regmap *regmap;
57 struct mutex update_lock;
58 enum chips type;
59};
60
61static int lm95234_read_temp(struct regmap *regmap, int index, long *t)
62{
63 unsigned int regs[2];
64 int temp = 0, ret;
65 u8 regvals[2];
66
67 if (index) {
68 regs[0] = LM95234_REG_UTEMPH(index - 1);
69 regs[1] = LM95234_REG_UTEMPL(index - 1);
70 ret = regmap_multi_reg_read(regmap, regs, regvals, 2);
71 if (ret)
72 return ret;
73 temp = (regvals[0] << 8) | regvals[1];
74 }
75 /*
76 * Read signed temperature if unsigned temperature is 0,
77 * or if this is the local sensor.
78 */
79 if (!temp) {
80 regs[0] = LM95234_REG_TEMPH(index);
81 regs[1] = LM95234_REG_TEMPL(index);
82 ret = regmap_multi_reg_read(regmap, regs, regvals, 2);
83 if (ret)
84 return ret;
85 temp = (regvals[0] << 8) | regvals[1];
86 temp = sign_extend32(temp, 15);
87 }
88 *t = DIV_ROUND_CLOSEST(temp * 125, 32);
89 return 0;
90}
91
92static int lm95234_hyst_get(struct regmap *regmap, int reg, long *val)
93{
94 unsigned int regs[2] = {reg, LM95234_REG_TCRIT_HYST};
95 u8 regvals[2];
96 int ret;
97
98 ret = regmap_multi_reg_read(regmap, regs, regvals, 2);
99 if (ret)
100 return ret;
101 *val = (regvals[0] - regvals[1]) * 1000;
102 return 0;
103}
104
105static ssize_t lm95234_hyst_set(struct lm95234_data *data, long val)
106{
107 u32 tcrit;
108 int ret;
109
110 mutex_lock(&data->update_lock);
111
112 ret = regmap_read(data->regmap, LM95234_REG_TCRIT1(0), &tcrit);
113 if (ret)
114 goto unlock;
115
116 val = DIV_ROUND_CLOSEST(clamp_val(val, -255000, 255000), 1000);
117 val = clamp_val((int)tcrit - val, 0, 31);
118
119 ret = regmap_write(data->regmap, LM95234_REG_TCRIT_HYST, val);
120unlock:
121 mutex_unlock(&data->update_lock);
122 return ret;
123}
124
125static int lm95234_crit_reg(int channel)
126{
127 if (channel == 1 || channel == 2)
128 return LM95234_REG_TCRIT2(channel - 1);
129 return LM95234_REG_TCRIT1(channel);
130}
131
132static int lm95234_temp_write(struct device *dev, u32 attr, int channel, long val)
133{
134 struct lm95234_data *data = dev_get_drvdata(dev);
135 struct regmap *regmap = data->regmap;
136
137 switch (attr) {
138 case hwmon_temp_enable:
139 if (val && val != 1)
140 return -EINVAL;
141 return regmap_update_bits(regmap, LM95234_REG_ENABLE,
142 BIT(channel), val ? BIT(channel) : 0);
143 case hwmon_temp_type:
144 if (val != 1 && val != 2)
145 return -EINVAL;
146 return regmap_update_bits(regmap, LM95234_REG_REM_MODEL,
147 BIT(channel),
148 val == 1 ? BIT(channel) : 0);
149 case hwmon_temp_offset:
150 val = DIV_ROUND_CLOSEST(clamp_val(val, -64000, 63500), 500);
151 return regmap_write(regmap, LM95234_REG_OFFSET(channel - 1), val);
152 case hwmon_temp_max:
153 val = clamp_val(val, 0, channel == 1 ? 127000 : 255000);
154 val = DIV_ROUND_CLOSEST(val, 1000);
155 return regmap_write(regmap, lm95234_crit_reg(channel), val);
156 case hwmon_temp_max_hyst:
157 return lm95234_hyst_set(data, val);
158 case hwmon_temp_crit:
159 val = DIV_ROUND_CLOSEST(clamp_val(val, 0, 255000), 1000);
160 return regmap_write(regmap, LM95234_REG_TCRIT1(channel), val);
161 default:
162 return -EOPNOTSUPP;
163 }
164 return 0;
165}
166
167static int lm95234_alarm_reg(int channel)
168{
169 if (channel == 1 || channel == 2)
170 return LM95234_REG_STS_TCRIT2;
171 return LM95234_REG_STS_TCRIT1;
172}
173
174static int lm95234_temp_read(struct device *dev, u32 attr, int channel, long *val)
175{
176 struct lm95234_data *data = dev_get_drvdata(dev);
177 struct regmap *regmap = data->regmap;
178 u32 regval, mask;
179 int ret;
180
181 switch (attr) {
182 case hwmon_temp_enable:
183 ret = regmap_read(regmap, LM95234_REG_ENABLE, ®val);
184 if (ret)
185 return ret;
186 *val = !!(regval & BIT(channel));
187 break;
188 case hwmon_temp_input:
189 return lm95234_read_temp(regmap, channel, val);
190 case hwmon_temp_max_alarm:
191 ret = regmap_read(regmap, lm95234_alarm_reg(channel), ®val);
192 if (ret)
193 return ret;
194 *val = !!(regval & BIT(channel));
195 break;
196 case hwmon_temp_crit_alarm:
197 ret = regmap_read(regmap, LM95234_REG_STS_TCRIT1, ®val);
198 if (ret)
199 return ret;
200 *val = !!(regval & BIT(channel));
201 break;
202 case hwmon_temp_crit_hyst:
203 return lm95234_hyst_get(regmap, LM95234_REG_TCRIT1(channel), val);
204 case hwmon_temp_type:
205 ret = regmap_read(regmap, LM95234_REG_REM_MODEL, ®val);
206 if (ret)
207 return ret;
208 *val = (regval & BIT(channel)) ? 1 : 2;
209 break;
210 case hwmon_temp_offset:
211 ret = regmap_read(regmap, LM95234_REG_OFFSET(channel - 1), ®val);
212 if (ret)
213 return ret;
214 *val = sign_extend32(regval, 7) * 500;
215 break;
216 case hwmon_temp_fault:
217 ret = regmap_read(regmap, LM95234_REG_STS_FAULT, ®val);
218 if (ret)
219 return ret;
220 mask = (BIT(0) | BIT(1)) << ((channel - 1) << 1);
221 *val = !!(regval & mask);
222 break;
223 case hwmon_temp_max:
224 ret = regmap_read(regmap, lm95234_crit_reg(channel), ®val);
225 if (ret)
226 return ret;
227 *val = regval * 1000;
228 break;
229 case hwmon_temp_max_hyst:
230 return lm95234_hyst_get(regmap, lm95234_crit_reg(channel), val);
231 case hwmon_temp_crit:
232 ret = regmap_read(regmap, LM95234_REG_TCRIT1(channel), ®val);
233 if (ret)
234 return ret;
235 *val = regval * 1000;
236 break;
237 default:
238 return -EOPNOTSUPP;
239 }
240 return 0;
241}
242
243static u16 update_intervals[] = { 143, 364, 1000, 2500 };
244
245static int lm95234_chip_write(struct device *dev, u32 attr, long val)
246{
247 struct lm95234_data *data = dev_get_drvdata(dev);
248
249 switch (attr) {
250 case hwmon_chip_update_interval:
251 val = find_closest(val, update_intervals, ARRAY_SIZE(update_intervals));
252 return regmap_write(data->regmap, LM95234_REG_CONVRATE, val);
253 default:
254 return -EOPNOTSUPP;
255 }
256 return 0;
257}
258
259static int lm95234_chip_read(struct device *dev, u32 attr, long *val)
260{
261 struct lm95234_data *data = dev_get_drvdata(dev);
262 u32 convrate;
263 int ret;
264
265 switch (attr) {
266 case hwmon_chip_update_interval:
267 ret = regmap_read(data->regmap, LM95234_REG_CONVRATE, &convrate);
268 if (ret)
269 return ret;
270
271 *val = update_intervals[convrate & 0x03];
272 break;
273 default:
274 return -EOPNOTSUPP;
275 }
276 return 0;
277}
278
279static int lm95234_write(struct device *dev, enum hwmon_sensor_types type,
280 u32 attr, int channel, long val)
281{
282 switch (type) {
283 case hwmon_chip:
284 return lm95234_chip_write(dev, attr, val);
285 case hwmon_temp:
286 return lm95234_temp_write(dev, attr, channel, val);
287 default:
288 return -EOPNOTSUPP;
289 }
290}
291
292static int lm95234_read(struct device *dev, enum hwmon_sensor_types type,
293 u32 attr, int channel, long *val)
294{
295 switch (type) {
296 case hwmon_chip:
297 return lm95234_chip_read(dev, attr, val);
298 case hwmon_temp:
299 return lm95234_temp_read(dev, attr, channel, val);
300 default:
301 return -EOPNOTSUPP;
302 }
303}
304
305static umode_t lm95234_is_visible(const void *_data, enum hwmon_sensor_types type,
306 u32 attr, int channel)
307{
308 const struct lm95234_data *data = _data;
309
310 if (data->type == lm95233 && channel > 2)
311 return 0;
312
313 switch (type) {
314 case hwmon_chip:
315 switch (attr) {
316 case hwmon_chip_update_interval:
317 return 0644;
318 default:
319 break;
320 }
321 break;
322 case hwmon_temp:
323 switch (attr) {
324 case hwmon_temp_input:
325 case hwmon_temp_max_alarm:
326 return 0444;
327 case hwmon_temp_crit_alarm:
328 case hwmon_temp_crit_hyst:
329 return (channel && channel < 3) ? 0444 : 0;
330 case hwmon_temp_type:
331 case hwmon_temp_offset:
332 return channel ? 0644 : 0;
333 case hwmon_temp_fault:
334 return channel ? 0444 : 0;
335 case hwmon_temp_max:
336 case hwmon_temp_enable:
337 return 0644;
338 case hwmon_temp_max_hyst:
339 return channel ? 0444 : 0644;
340 case hwmon_temp_crit:
341 return (channel && channel < 3) ? 0644 : 0;
342 default:
343 break;
344 }
345 break;
346 default:
347 break;
348 }
349 return 0;
350}
351
352static const struct hwmon_channel_info * const lm95234_info[] = {
353 HWMON_CHANNEL_INFO(chip, HWMON_C_UPDATE_INTERVAL),
354 HWMON_CHANNEL_INFO(temp,
355 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST |
356 HWMON_T_MAX_ALARM | HWMON_T_ENABLE,
357 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST |
358 HWMON_T_MAX_ALARM | HWMON_T_FAULT | HWMON_T_TYPE |
359 HWMON_T_CRIT | HWMON_T_CRIT_HYST |
360 HWMON_T_CRIT_ALARM | HWMON_T_OFFSET | HWMON_T_ENABLE,
361 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST |
362 HWMON_T_MAX_ALARM | HWMON_T_FAULT | HWMON_T_TYPE |
363 HWMON_T_CRIT | HWMON_T_CRIT_HYST |
364 HWMON_T_CRIT_ALARM | HWMON_T_OFFSET | HWMON_T_ENABLE,
365 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST |
366 HWMON_T_MAX_ALARM | HWMON_T_FAULT | HWMON_T_TYPE |
367 HWMON_T_OFFSET | HWMON_T_ENABLE,
368 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST |
369 HWMON_T_MAX_ALARM | HWMON_T_FAULT | HWMON_T_TYPE |
370 HWMON_T_OFFSET | HWMON_T_ENABLE),
371 NULL
372};
373
374static const struct hwmon_ops lm95234_hwmon_ops = {
375 .is_visible = lm95234_is_visible,
376 .read = lm95234_read,
377 .write = lm95234_write,
378};
379
380static const struct hwmon_chip_info lm95234_chip_info = {
381 .ops = &lm95234_hwmon_ops,
382 .info = lm95234_info,
383};
384
385static bool lm95234_volatile_reg(struct device *dev, unsigned int reg)
386{
387 switch (reg) {
388 case LM95234_REG_TEMPH(0) ... LM95234_REG_TEMPH(4):
389 case LM95234_REG_TEMPL(0) ... LM95234_REG_TEMPL(4):
390 case LM95234_REG_UTEMPH(0) ... LM95234_REG_UTEMPH(3):
391 case LM95234_REG_UTEMPL(0) ... LM95234_REG_UTEMPL(3):
392 case LM95234_REG_STS_FAULT:
393 case LM95234_REG_STS_TCRIT1:
394 case LM95234_REG_STS_TCRIT2:
395 case LM95234_REG_REM_MODEL_STS:
396 return true;
397 default:
398 return false;
399 }
400}
401
402static bool lm95234_writeable_reg(struct device *dev, unsigned int reg)
403{
404 switch (reg) {
405 case LM95234_REG_CONFIG ... LM95234_REG_FILTER:
406 case LM95234_REG_REM_MODEL ... LM95234_REG_OFFSET(3):
407 case LM95234_REG_TCRIT1(0) ... LM95234_REG_TCRIT1(4):
408 case LM95234_REG_TCRIT2(0) ... LM95234_REG_TCRIT2(1):
409 case LM95234_REG_TCRIT_HYST:
410 return true;
411 default:
412 return false;
413 }
414}
415
416static const struct regmap_config lm95234_regmap_config = {
417 .reg_bits = 8,
418 .val_bits = 8,
419 .writeable_reg = lm95234_writeable_reg,
420 .volatile_reg = lm95234_volatile_reg,
421 .cache_type = REGCACHE_MAPLE,
422};
423
424static int lm95234_detect(struct i2c_client *client,
425 struct i2c_board_info *info)
426{
427 struct i2c_adapter *adapter = client->adapter;
428 int address = client->addr;
429 u8 config_mask, model_mask;
430 int mfg_id, chip_id, val;
431 const char *name;
432
433 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
434 return -ENODEV;
435
436 mfg_id = i2c_smbus_read_byte_data(client, LM95234_REG_MAN_ID);
437 if (mfg_id != NATSEMI_MAN_ID)
438 return -ENODEV;
439
440 chip_id = i2c_smbus_read_byte_data(client, LM95234_REG_CHIP_ID);
441 switch (chip_id) {
442 case LM95233_CHIP_ID:
443 if (address != 0x18 && address != 0x2a && address != 0x2b)
444 return -ENODEV;
445 config_mask = 0xbf;
446 model_mask = 0xf9;
447 name = "lm95233";
448 break;
449 case LM95234_CHIP_ID:
450 if (address != 0x18 && address != 0x4d && address != 0x4e)
451 return -ENODEV;
452 config_mask = 0xbc;
453 model_mask = 0xe1;
454 name = "lm95234";
455 break;
456 default:
457 return -ENODEV;
458 }
459
460 val = i2c_smbus_read_byte_data(client, LM95234_REG_STATUS);
461 if (val & 0x30)
462 return -ENODEV;
463
464 val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG);
465 if (val & config_mask)
466 return -ENODEV;
467
468 val = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE);
469 if (val & 0xfc)
470 return -ENODEV;
471
472 val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
473 if (val & model_mask)
474 return -ENODEV;
475
476 val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS);
477 if (val & model_mask)
478 return -ENODEV;
479
480 strscpy(info->type, name, I2C_NAME_SIZE);
481 return 0;
482}
483
484static int lm95234_init_client(struct device *dev, struct regmap *regmap)
485{
486 u32 val, model;
487 int ret;
488
489 /* start conversion if necessary */
490 ret = regmap_clear_bits(regmap, LM95234_REG_CONFIG, 0x40);
491 if (ret)
492 return ret;
493
494 /* If diode type status reports an error, try to fix it */
495 ret = regmap_read(regmap, LM95234_REG_REM_MODEL_STS, &val);
496 if (ret < 0)
497 return ret;
498 ret = regmap_read(regmap, LM95234_REG_REM_MODEL, &model);
499 if (ret < 0)
500 return ret;
501 if (model & val) {
502 dev_notice(dev,
503 "Fixing remote diode type misconfiguration (0x%x)\n",
504 val);
505 ret = regmap_write(regmap, LM95234_REG_REM_MODEL, model & ~val);
506 }
507 return ret;
508}
509
510static int lm95234_probe(struct i2c_client *client)
511{
512 struct device *dev = &client->dev;
513 struct lm95234_data *data;
514 struct device *hwmon_dev;
515 struct regmap *regmap;
516 int err;
517
518 data = devm_kzalloc(dev, sizeof(struct lm95234_data), GFP_KERNEL);
519 if (!data)
520 return -ENOMEM;
521
522 data->type = (uintptr_t)i2c_get_match_data(client);
523
524 regmap = devm_regmap_init_i2c(client, &lm95234_regmap_config);
525 if (IS_ERR(regmap))
526 return PTR_ERR(regmap);
527
528 data->regmap = regmap;
529 mutex_init(&data->update_lock);
530
531 /* Initialize the LM95234 chip */
532 err = lm95234_init_client(dev, regmap);
533 if (err < 0)
534 return err;
535
536 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
537 data, &lm95234_chip_info, NULL);
538 return PTR_ERR_OR_ZERO(hwmon_dev);
539}
540
541/* Driver data (common to all clients) */
542static const struct i2c_device_id lm95234_id[] = {
543 { "lm95233", lm95233 },
544 { "lm95234", lm95234 },
545 { }
546};
547MODULE_DEVICE_TABLE(i2c, lm95234_id);
548
549static struct i2c_driver lm95234_driver = {
550 .class = I2C_CLASS_HWMON,
551 .driver = {
552 .name = DRVNAME,
553 },
554 .probe = lm95234_probe,
555 .id_table = lm95234_id,
556 .detect = lm95234_detect,
557 .address_list = normal_i2c,
558};
559
560module_i2c_driver(lm95234_driver);
561
562MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
563MODULE_DESCRIPTION("LM95233/LM95234 sensor driver");
564MODULE_LICENSE("GPL");