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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");