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
24 enum chips { lm95233, lm95234 };
25
26 static 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) */
54 struct 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
lm95234_read_temp(struct i2c_client * client,int index,int * t)71 static 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
109 static u16 update_intervals[] = { 143, 364, 1000, 2500 };
110
111 /* Fill value cache. Must be called with update lock held. */
112
lm95234_fill_cache(struct lm95234_data * data,struct i2c_client * client)113 static 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
lm95234_update_device(struct lm95234_data * data)156 static 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;
199 abort:
200 mutex_unlock(&data->update_lock);
201
202 return ret;
203 }
204
temp_show(struct device * dev,struct device_attribute * attr,char * buf)205 static 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
alarm_show(struct device * dev,struct device_attribute * attr,char * buf)219 static 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
type_show(struct device * dev,struct device_attribute * attr,char * buf)232 static 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
type_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)245 static 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
tcrit2_show(struct device * dev,struct device_attribute * attr,char * buf)276 static 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
tcrit2_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)289 static 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 = DIV_ROUND_CLOSEST(clamp_val(val, 0, (index ? 255 : 127) * 1000),
305 1000);
306
307 mutex_lock(&data->update_lock);
308 data->tcrit2[index] = val;
309 i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT2(index), val);
310 mutex_unlock(&data->update_lock);
311
312 return count;
313 }
314
tcrit2_hyst_show(struct device * dev,struct device_attribute * attr,char * buf)315 static ssize_t tcrit2_hyst_show(struct device *dev,
316 struct device_attribute *attr, char *buf)
317 {
318 struct lm95234_data *data = dev_get_drvdata(dev);
319 int index = to_sensor_dev_attr(attr)->index;
320 int ret = lm95234_update_device(data);
321
322 if (ret)
323 return ret;
324
325 /* Result can be negative, so be careful with unsigned operands */
326 return sprintf(buf, "%d",
327 ((int)data->tcrit2[index] - (int)data->thyst) * 1000);
328 }
329
tcrit1_show(struct device * dev,struct device_attribute * attr,char * buf)330 static ssize_t tcrit1_show(struct device *dev, struct device_attribute *attr,
331 char *buf)
332 {
333 struct lm95234_data *data = dev_get_drvdata(dev);
334 int index = to_sensor_dev_attr(attr)->index;
335
336 return sprintf(buf, "%u", data->tcrit1[index] * 1000);
337 }
338
tcrit1_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)339 static ssize_t tcrit1_store(struct device *dev, struct device_attribute *attr,
340 const char *buf, size_t count)
341 {
342 struct lm95234_data *data = dev_get_drvdata(dev);
343 int index = to_sensor_dev_attr(attr)->index;
344 int ret = lm95234_update_device(data);
345 long val;
346
347 if (ret)
348 return ret;
349
350 ret = kstrtol(buf, 10, &val);
351 if (ret < 0)
352 return ret;
353
354 val = DIV_ROUND_CLOSEST(clamp_val(val, 0, 255000), 1000);
355
356 mutex_lock(&data->update_lock);
357 data->tcrit1[index] = val;
358 i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT1(index), val);
359 mutex_unlock(&data->update_lock);
360
361 return count;
362 }
363
tcrit1_hyst_show(struct device * dev,struct device_attribute * attr,char * buf)364 static ssize_t tcrit1_hyst_show(struct device *dev,
365 struct device_attribute *attr, char *buf)
366 {
367 struct lm95234_data *data = dev_get_drvdata(dev);
368 int index = to_sensor_dev_attr(attr)->index;
369 int ret = lm95234_update_device(data);
370
371 if (ret)
372 return ret;
373
374 /* Result can be negative, so be careful with unsigned operands */
375 return sprintf(buf, "%d",
376 ((int)data->tcrit1[index] - (int)data->thyst) * 1000);
377 }
378
tcrit1_hyst_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)379 static ssize_t tcrit1_hyst_store(struct device *dev,
380 struct device_attribute *attr,
381 const char *buf, size_t count)
382 {
383 struct lm95234_data *data = dev_get_drvdata(dev);
384 int index = to_sensor_dev_attr(attr)->index;
385 int ret = lm95234_update_device(data);
386 long val;
387
388 if (ret)
389 return ret;
390
391 ret = kstrtol(buf, 10, &val);
392 if (ret < 0)
393 return ret;
394
395 val = DIV_ROUND_CLOSEST(clamp_val(val, -255000, 255000), 1000);
396 val = clamp_val((int)data->tcrit1[index] - val, 0, 31);
397
398 mutex_lock(&data->update_lock);
399 data->thyst = val;
400 i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT_HYST, val);
401 mutex_unlock(&data->update_lock);
402
403 return count;
404 }
405
offset_show(struct device * dev,struct device_attribute * attr,char * buf)406 static ssize_t offset_show(struct device *dev, struct device_attribute *attr,
407 char *buf)
408 {
409 struct lm95234_data *data = dev_get_drvdata(dev);
410 int index = to_sensor_dev_attr(attr)->index;
411 int ret = lm95234_update_device(data);
412
413 if (ret)
414 return ret;
415
416 return sprintf(buf, "%d", data->toffset[index] * 500);
417 }
418
offset_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)419 static ssize_t offset_store(struct device *dev, struct device_attribute *attr,
420 const char *buf, size_t count)
421 {
422 struct lm95234_data *data = dev_get_drvdata(dev);
423 int index = to_sensor_dev_attr(attr)->index;
424 int ret = lm95234_update_device(data);
425 long val;
426
427 if (ret)
428 return ret;
429
430 ret = kstrtol(buf, 10, &val);
431 if (ret < 0)
432 return ret;
433
434 /* Accuracy is 1/2 degrees C */
435 val = DIV_ROUND_CLOSEST(clamp_val(val, -64000, 63500), 500);
436
437 mutex_lock(&data->update_lock);
438 data->toffset[index] = val;
439 i2c_smbus_write_byte_data(data->client, LM95234_REG_OFFSET(index), val);
440 mutex_unlock(&data->update_lock);
441
442 return count;
443 }
444
update_interval_show(struct device * dev,struct device_attribute * attr,char * buf)445 static ssize_t update_interval_show(struct device *dev,
446 struct device_attribute *attr, char *buf)
447 {
448 struct lm95234_data *data = dev_get_drvdata(dev);
449 int ret = lm95234_update_device(data);
450
451 if (ret)
452 return ret;
453
454 return sprintf(buf, "%lu\n",
455 DIV_ROUND_CLOSEST(data->interval * 1000, HZ));
456 }
457
update_interval_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)458 static ssize_t update_interval_store(struct device *dev,
459 struct device_attribute *attr,
460 const char *buf, size_t count)
461 {
462 struct lm95234_data *data = dev_get_drvdata(dev);
463 int ret = lm95234_update_device(data);
464 unsigned long val;
465 u8 regval;
466
467 if (ret)
468 return ret;
469
470 ret = kstrtoul(buf, 10, &val);
471 if (ret < 0)
472 return ret;
473
474 for (regval = 0; regval < 3; regval++) {
475 if (val <= update_intervals[regval])
476 break;
477 }
478
479 mutex_lock(&data->update_lock);
480 data->interval = msecs_to_jiffies(update_intervals[regval]);
481 i2c_smbus_write_byte_data(data->client, LM95234_REG_CONVRATE, regval);
482 mutex_unlock(&data->update_lock);
483
484 return count;
485 }
486
487 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
488 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
489 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
490 static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
491 static SENSOR_DEVICE_ATTR_RO(temp5_input, temp, 4);
492
493 static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, BIT(0) | BIT(1));
494 static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, BIT(2) | BIT(3));
495 static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, BIT(4) | BIT(5));
496 static SENSOR_DEVICE_ATTR_RO(temp5_fault, alarm, BIT(6) | BIT(7));
497
498 static SENSOR_DEVICE_ATTR_RW(temp2_type, type, BIT(1));
499 static SENSOR_DEVICE_ATTR_RW(temp3_type, type, BIT(2));
500 static SENSOR_DEVICE_ATTR_RW(temp4_type, type, BIT(3));
501 static SENSOR_DEVICE_ATTR_RW(temp5_type, type, BIT(4));
502
503 static SENSOR_DEVICE_ATTR_RW(temp1_max, tcrit1, 0);
504 static SENSOR_DEVICE_ATTR_RW(temp2_max, tcrit2, 0);
505 static SENSOR_DEVICE_ATTR_RW(temp3_max, tcrit2, 1);
506 static SENSOR_DEVICE_ATTR_RW(temp4_max, tcrit1, 3);
507 static SENSOR_DEVICE_ATTR_RW(temp5_max, tcrit1, 4);
508
509 static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, tcrit1_hyst, 0);
510 static SENSOR_DEVICE_ATTR_RO(temp2_max_hyst, tcrit2_hyst, 0);
511 static SENSOR_DEVICE_ATTR_RO(temp3_max_hyst, tcrit2_hyst, 1);
512 static SENSOR_DEVICE_ATTR_RO(temp4_max_hyst, tcrit1_hyst, 3);
513 static SENSOR_DEVICE_ATTR_RO(temp5_max_hyst, tcrit1_hyst, 4);
514
515 static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, BIT(0 + 8));
516 static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, BIT(1 + 16));
517 static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, BIT(2 + 16));
518 static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, BIT(3 + 8));
519 static SENSOR_DEVICE_ATTR_RO(temp5_max_alarm, alarm, BIT(4 + 8));
520
521 static SENSOR_DEVICE_ATTR_RW(temp2_crit, tcrit1, 1);
522 static SENSOR_DEVICE_ATTR_RW(temp3_crit, tcrit1, 2);
523
524 static SENSOR_DEVICE_ATTR_RO(temp2_crit_hyst, tcrit1_hyst, 1);
525 static SENSOR_DEVICE_ATTR_RO(temp3_crit_hyst, tcrit1_hyst, 2);
526
527 static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, BIT(1 + 8));
528 static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, BIT(2 + 8));
529
530 static SENSOR_DEVICE_ATTR_RW(temp2_offset, offset, 0);
531 static SENSOR_DEVICE_ATTR_RW(temp3_offset, offset, 1);
532 static SENSOR_DEVICE_ATTR_RW(temp4_offset, offset, 2);
533 static SENSOR_DEVICE_ATTR_RW(temp5_offset, offset, 3);
534
535 static DEVICE_ATTR_RW(update_interval);
536
537 static struct attribute *lm95234_common_attrs[] = {
538 &sensor_dev_attr_temp1_input.dev_attr.attr,
539 &sensor_dev_attr_temp2_input.dev_attr.attr,
540 &sensor_dev_attr_temp3_input.dev_attr.attr,
541 &sensor_dev_attr_temp2_fault.dev_attr.attr,
542 &sensor_dev_attr_temp3_fault.dev_attr.attr,
543 &sensor_dev_attr_temp2_type.dev_attr.attr,
544 &sensor_dev_attr_temp3_type.dev_attr.attr,
545 &sensor_dev_attr_temp1_max.dev_attr.attr,
546 &sensor_dev_attr_temp2_max.dev_attr.attr,
547 &sensor_dev_attr_temp3_max.dev_attr.attr,
548 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
549 &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
550 &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
551 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
552 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
553 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
554 &sensor_dev_attr_temp2_crit.dev_attr.attr,
555 &sensor_dev_attr_temp3_crit.dev_attr.attr,
556 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
557 &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
558 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
559 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
560 &sensor_dev_attr_temp2_offset.dev_attr.attr,
561 &sensor_dev_attr_temp3_offset.dev_attr.attr,
562 &dev_attr_update_interval.attr,
563 NULL
564 };
565
566 static const struct attribute_group lm95234_common_group = {
567 .attrs = lm95234_common_attrs,
568 };
569
570 static struct attribute *lm95234_attrs[] = {
571 &sensor_dev_attr_temp4_input.dev_attr.attr,
572 &sensor_dev_attr_temp5_input.dev_attr.attr,
573 &sensor_dev_attr_temp4_fault.dev_attr.attr,
574 &sensor_dev_attr_temp5_fault.dev_attr.attr,
575 &sensor_dev_attr_temp4_type.dev_attr.attr,
576 &sensor_dev_attr_temp5_type.dev_attr.attr,
577 &sensor_dev_attr_temp4_max.dev_attr.attr,
578 &sensor_dev_attr_temp5_max.dev_attr.attr,
579 &sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
580 &sensor_dev_attr_temp5_max_hyst.dev_attr.attr,
581 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
582 &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
583 &sensor_dev_attr_temp4_offset.dev_attr.attr,
584 &sensor_dev_attr_temp5_offset.dev_attr.attr,
585 NULL
586 };
587
588 static const struct attribute_group lm95234_group = {
589 .attrs = lm95234_attrs,
590 };
591
lm95234_detect(struct i2c_client * client,struct i2c_board_info * info)592 static int lm95234_detect(struct i2c_client *client,
593 struct i2c_board_info *info)
594 {
595 struct i2c_adapter *adapter = client->adapter;
596 int address = client->addr;
597 u8 config_mask, model_mask;
598 int mfg_id, chip_id, val;
599 const char *name;
600
601 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
602 return -ENODEV;
603
604 mfg_id = i2c_smbus_read_byte_data(client, LM95234_REG_MAN_ID);
605 if (mfg_id != NATSEMI_MAN_ID)
606 return -ENODEV;
607
608 chip_id = i2c_smbus_read_byte_data(client, LM95234_REG_CHIP_ID);
609 switch (chip_id) {
610 case LM95233_CHIP_ID:
611 if (address != 0x18 && address != 0x2a && address != 0x2b)
612 return -ENODEV;
613 config_mask = 0xbf;
614 model_mask = 0xf9;
615 name = "lm95233";
616 break;
617 case LM95234_CHIP_ID:
618 if (address != 0x18 && address != 0x4d && address != 0x4e)
619 return -ENODEV;
620 config_mask = 0xbc;
621 model_mask = 0xe1;
622 name = "lm95234";
623 break;
624 default:
625 return -ENODEV;
626 }
627
628 val = i2c_smbus_read_byte_data(client, LM95234_REG_STATUS);
629 if (val & 0x30)
630 return -ENODEV;
631
632 val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG);
633 if (val & config_mask)
634 return -ENODEV;
635
636 val = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE);
637 if (val & 0xfc)
638 return -ENODEV;
639
640 val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
641 if (val & model_mask)
642 return -ENODEV;
643
644 val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS);
645 if (val & model_mask)
646 return -ENODEV;
647
648 strscpy(info->type, name, I2C_NAME_SIZE);
649 return 0;
650 }
651
lm95234_init_client(struct i2c_client * client)652 static int lm95234_init_client(struct i2c_client *client)
653 {
654 int val, model;
655
656 /* start conversion if necessary */
657 val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG);
658 if (val < 0)
659 return val;
660 if (val & 0x40)
661 i2c_smbus_write_byte_data(client, LM95234_REG_CONFIG,
662 val & ~0x40);
663
664 /* If diode type status reports an error, try to fix it */
665 val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS);
666 if (val < 0)
667 return val;
668 model = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
669 if (model < 0)
670 return model;
671 if (model & val) {
672 dev_notice(&client->dev,
673 "Fixing remote diode type misconfiguration (0x%x)\n",
674 val);
675 i2c_smbus_write_byte_data(client, LM95234_REG_REM_MODEL,
676 model & ~val);
677 }
678 return 0;
679 }
680
681 static const struct i2c_device_id lm95234_id[];
682
lm95234_probe(struct i2c_client * client)683 static int lm95234_probe(struct i2c_client *client)
684 {
685 struct device *dev = &client->dev;
686 struct lm95234_data *data;
687 struct device *hwmon_dev;
688 int err;
689
690 data = devm_kzalloc(dev, sizeof(struct lm95234_data), GFP_KERNEL);
691 if (!data)
692 return -ENOMEM;
693
694 data->client = client;
695 mutex_init(&data->update_lock);
696
697 /* Initialize the LM95234 chip */
698 err = lm95234_init_client(client);
699 if (err < 0)
700 return err;
701
702 data->groups[0] = &lm95234_common_group;
703 if (i2c_match_id(lm95234_id, client)->driver_data == lm95234)
704 data->groups[1] = &lm95234_group;
705
706 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
707 data, data->groups);
708 return PTR_ERR_OR_ZERO(hwmon_dev);
709 }
710
711 /* Driver data (common to all clients) */
712 static const struct i2c_device_id lm95234_id[] = {
713 { "lm95233", lm95233 },
714 { "lm95234", lm95234 },
715 { }
716 };
717 MODULE_DEVICE_TABLE(i2c, lm95234_id);
718
719 static struct i2c_driver lm95234_driver = {
720 .class = I2C_CLASS_HWMON,
721 .driver = {
722 .name = DRVNAME,
723 },
724 .probe = lm95234_probe,
725 .id_table = lm95234_id,
726 .detect = lm95234_detect,
727 .address_list = normal_i2c,
728 };
729
730 module_i2c_driver(lm95234_driver);
731
732 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
733 MODULE_DESCRIPTION("LM95233/LM95234 sensor driver");
734 MODULE_LICENSE("GPL");
735