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 | |
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 | |
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(m: 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 | |
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, index: i, t: &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(lock: &data->update_lock); |
201 | |
202 | return ret; |
203 | } |
204 | |
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, fmt: "%d\n" , |
216 | DIV_ROUND_CLOSEST(data->temp[index] * 125, 32)); |
217 | } |
218 | |
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, fmt: "%u" , !!(data->status & mask)); |
230 | } |
231 | |
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, fmt: data->sensor_type & mask ? "1\n" : "2\n" ); |
243 | } |
244 | |
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(s: buf, base: 10, res: &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(client: data->client, LM95234_REG_REM_MODEL, |
270 | value: data->sensor_type); |
271 | mutex_unlock(lock: &data->update_lock); |
272 | |
273 | return count; |
274 | } |
275 | |
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, fmt: "%u" , data->tcrit2[index] * 1000); |
287 | } |
288 | |
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(s: buf, base: 10, res: &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(client: data->client, LM95234_REG_TCRIT2(index), value: val); |
309 | mutex_unlock(lock: &data->update_lock); |
310 | |
311 | return count; |
312 | } |
313 | |
314 | static 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, fmt: "%d" , |
326 | ((int)data->tcrit2[index] - (int)data->thyst) * 1000); |
327 | } |
328 | |
329 | static 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, fmt: "%u" , data->tcrit1[index] * 1000); |
336 | } |
337 | |
338 | static 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(s: buf, base: 10, res: &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(client: data->client, LM95234_REG_TCRIT1(index), value: val); |
358 | mutex_unlock(lock: &data->update_lock); |
359 | |
360 | return count; |
361 | } |
362 | |
363 | static 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, fmt: "%d" , |
375 | ((int)data->tcrit1[index] - (int)data->thyst) * 1000); |
376 | } |
377 | |
378 | static 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(s: buf, base: 10, res: &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(client: data->client, LM95234_REG_TCRIT_HYST, value: val); |
400 | mutex_unlock(lock: &data->update_lock); |
401 | |
402 | return count; |
403 | } |
404 | |
405 | static 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, fmt: "%d" , data->toffset[index] * 500); |
416 | } |
417 | |
418 | static 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(s: buf, base: 10, res: &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(client: data->client, LM95234_REG_OFFSET(index), value: val); |
439 | mutex_unlock(lock: &data->update_lock); |
440 | |
441 | return count; |
442 | } |
443 | |
444 | static 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, fmt: "%lu\n" , |
454 | DIV_ROUND_CLOSEST(data->interval * 1000, HZ)); |
455 | } |
456 | |
457 | static 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(s: buf, base: 10, res: &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(m: update_intervals[regval]); |
480 | i2c_smbus_write_byte_data(client: data->client, LM95234_REG_CONVRATE, value: regval); |
481 | mutex_unlock(lock: &data->update_lock); |
482 | |
483 | return count; |
484 | } |
485 | |
486 | static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0); |
487 | static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1); |
488 | static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2); |
489 | static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3); |
490 | static SENSOR_DEVICE_ATTR_RO(temp5_input, temp, 4); |
491 | |
492 | static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, BIT(0) | BIT(1)); |
493 | static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, BIT(2) | BIT(3)); |
494 | static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, BIT(4) | BIT(5)); |
495 | static SENSOR_DEVICE_ATTR_RO(temp5_fault, alarm, BIT(6) | BIT(7)); |
496 | |
497 | static SENSOR_DEVICE_ATTR_RW(temp2_type, type, BIT(1)); |
498 | static SENSOR_DEVICE_ATTR_RW(temp3_type, type, BIT(2)); |
499 | static SENSOR_DEVICE_ATTR_RW(temp4_type, type, BIT(3)); |
500 | static SENSOR_DEVICE_ATTR_RW(temp5_type, type, BIT(4)); |
501 | |
502 | static SENSOR_DEVICE_ATTR_RW(temp1_max, tcrit1, 0); |
503 | static SENSOR_DEVICE_ATTR_RW(temp2_max, tcrit2, 0); |
504 | static SENSOR_DEVICE_ATTR_RW(temp3_max, tcrit2, 1); |
505 | static SENSOR_DEVICE_ATTR_RW(temp4_max, tcrit1, 3); |
506 | static SENSOR_DEVICE_ATTR_RW(temp5_max, tcrit1, 4); |
507 | |
508 | static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, tcrit1_hyst, 0); |
509 | static SENSOR_DEVICE_ATTR_RO(temp2_max_hyst, tcrit2_hyst, 0); |
510 | static SENSOR_DEVICE_ATTR_RO(temp3_max_hyst, tcrit2_hyst, 1); |
511 | static SENSOR_DEVICE_ATTR_RO(temp4_max_hyst, tcrit1_hyst, 3); |
512 | static SENSOR_DEVICE_ATTR_RO(temp5_max_hyst, tcrit1_hyst, 4); |
513 | |
514 | static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, BIT(0 + 8)); |
515 | static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, BIT(1 + 16)); |
516 | static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, BIT(2 + 16)); |
517 | static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, BIT(3 + 8)); |
518 | static SENSOR_DEVICE_ATTR_RO(temp5_max_alarm, alarm, BIT(4 + 8)); |
519 | |
520 | static SENSOR_DEVICE_ATTR_RW(temp2_crit, tcrit1, 1); |
521 | static SENSOR_DEVICE_ATTR_RW(temp3_crit, tcrit1, 2); |
522 | |
523 | static SENSOR_DEVICE_ATTR_RO(temp2_crit_hyst, tcrit1_hyst, 1); |
524 | static SENSOR_DEVICE_ATTR_RO(temp3_crit_hyst, tcrit1_hyst, 2); |
525 | |
526 | static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, BIT(1 + 8)); |
527 | static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, BIT(2 + 8)); |
528 | |
529 | static SENSOR_DEVICE_ATTR_RW(temp2_offset, offset, 0); |
530 | static SENSOR_DEVICE_ATTR_RW(temp3_offset, offset, 1); |
531 | static SENSOR_DEVICE_ATTR_RW(temp4_offset, offset, 2); |
532 | static SENSOR_DEVICE_ATTR_RW(temp5_offset, offset, 3); |
533 | |
534 | static DEVICE_ATTR_RW(update_interval); |
535 | |
536 | static 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 | |
565 | static const struct attribute_group lm95234_common_group = { |
566 | .attrs = lm95234_common_attrs, |
567 | }; |
568 | |
569 | static 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 | |
587 | static const struct attribute_group lm95234_group = { |
588 | .attrs = lm95234_attrs, |
589 | }; |
590 | |
591 | static 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(adap: 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 | |
651 | static 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 | value: 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 | value: model & ~val); |
676 | } |
677 | return 0; |
678 | } |
679 | |
680 | static const struct i2c_device_id lm95234_id[]; |
681 | |
682 | static 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, size: 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(id: lm95234_id, client)->driver_data == lm95234) |
703 | data->groups[1] = &lm95234_group; |
704 | |
705 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, name: client->name, |
706 | drvdata: data, groups: data->groups); |
707 | return PTR_ERR_OR_ZERO(ptr: hwmon_dev); |
708 | } |
709 | |
710 | /* Driver data (common to all clients) */ |
711 | static const struct i2c_device_id lm95234_id[] = { |
712 | { "lm95233" , lm95233 }, |
713 | { "lm95234" , lm95234 }, |
714 | { } |
715 | }; |
716 | MODULE_DEVICE_TABLE(i2c, lm95234_id); |
717 | |
718 | static 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 | |
729 | module_i2c_driver(lm95234_driver); |
730 | |
731 | MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>" ); |
732 | MODULE_DESCRIPTION("LM95233/LM95234 sensor driver" ); |
733 | MODULE_LICENSE("GPL" ); |
734 | |