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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * nct7802 - Driver for Nuvoton NCT7802Y
4 *
5 * Copyright (C) 2014 Guenter Roeck <linux@roeck-us.net>
6 */
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/err.h>
11#include <linux/i2c.h>
12#include <linux/init.h>
13#include <linux/hwmon.h>
14#include <linux/hwmon-sysfs.h>
15#include <linux/jiffies.h>
16#include <linux/module.h>
17#include <linux/mutex.h>
18#include <linux/regmap.h>
19#include <linux/slab.h>
20
21#define DRVNAME "nct7802"
22
23static const u8 REG_VOLTAGE[5] = { 0x09, 0x0a, 0x0c, 0x0d, 0x0e };
24
25static const u8 REG_VOLTAGE_LIMIT_LSB[2][5] = {
26 { 0x46, 0x00, 0x40, 0x42, 0x44 },
27 { 0x45, 0x00, 0x3f, 0x41, 0x43 },
28};
29
30static const u8 REG_VOLTAGE_LIMIT_MSB[5] = { 0x48, 0x00, 0x47, 0x47, 0x48 };
31
32static const u8 REG_VOLTAGE_LIMIT_MSB_SHIFT[2][5] = {
33 { 0, 0, 4, 0, 4 },
34 { 2, 0, 6, 2, 6 },
35};
36
37#define REG_BANK 0x00
38#define REG_TEMP_LSB 0x05
39#define REG_TEMP_PECI_LSB 0x08
40#define REG_VOLTAGE_LOW 0x0f
41#define REG_FANCOUNT_LOW 0x13
42#define REG_START 0x21
43#define REG_MODE 0x22 /* 7.2.32 Mode Selection Register */
44#define REG_PECI_ENABLE 0x23
45#define REG_FAN_ENABLE 0x24
46#define REG_VMON_ENABLE 0x25
47#define REG_PWM(x) (0x60 + (x))
48#define REG_SMARTFAN_EN(x) (0x64 + (x) / 2)
49#define SMARTFAN_EN_SHIFT(x) ((x) % 2 * 4)
50#define REG_VENDOR_ID 0xfd
51#define REG_CHIP_ID 0xfe
52#define REG_VERSION_ID 0xff
53
54/*
55 * Resistance temperature detector (RTD) modes according to 7.2.32 Mode
56 * Selection Register
57 */
58#define RTD_MODE_CURRENT 0x1
59#define RTD_MODE_THERMISTOR 0x2
60#define RTD_MODE_VOLTAGE 0x3
61
62#define MODE_RTD_MASK 0x3
63#define MODE_LTD_EN 0x40
64
65/*
66 * Bit offset for sensors modes in REG_MODE.
67 * Valid for index 0..2, indicating RTD1..3.
68 */
69#define MODE_BIT_OFFSET_RTD(index) ((index) * 2)
70
71/*
72 * Data structures and manipulation thereof
73 */
74
75struct nct7802_data {
76 struct regmap *regmap;
77 struct mutex access_lock; /* for multi-byte read and write operations */
78 u8 in_status;
79 struct mutex in_alarm_lock;
80};
81
82static ssize_t temp_type_show(struct device *dev,
83 struct device_attribute *attr, char *buf)
84{
85 struct nct7802_data *data = dev_get_drvdata(dev);
86 struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
87 unsigned int mode;
88 int ret;
89
90 ret = regmap_read(data->regmap, REG_MODE, &mode);
91 if (ret < 0)
92 return ret;
93
94 return sprintf(buf, "%u\n", (mode >> (2 * sattr->index) & 3) + 2);
95}
96
97static ssize_t temp_type_store(struct device *dev,
98 struct device_attribute *attr, const char *buf,
99 size_t count)
100{
101 struct nct7802_data *data = dev_get_drvdata(dev);
102 struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
103 unsigned int type;
104 int err;
105
106 err = kstrtouint(buf, 0, &type);
107 if (err < 0)
108 return err;
109 if (sattr->index == 2 && type != 4) /* RD3 */
110 return -EINVAL;
111 if (type < 3 || type > 4)
112 return -EINVAL;
113 err = regmap_update_bits(data->regmap, REG_MODE,
114 3 << 2 * sattr->index, (type - 2) << 2 * sattr->index);
115 return err ? : count;
116}
117
118static ssize_t pwm_mode_show(struct device *dev,
119 struct device_attribute *attr, char *buf)
120{
121 struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
122 struct nct7802_data *data = dev_get_drvdata(dev);
123 unsigned int regval;
124 int ret;
125
126 if (sattr->index > 1)
127 return sprintf(buf, "1\n");
128
129 ret = regmap_read(data->regmap, 0x5E, ®val);
130 if (ret < 0)
131 return ret;
132
133 return sprintf(buf, "%u\n", !(regval & (1 << sattr->index)));
134}
135
136static ssize_t pwm_show(struct device *dev, struct device_attribute *devattr,
137 char *buf)
138{
139 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
140 struct nct7802_data *data = dev_get_drvdata(dev);
141 unsigned int val;
142 int ret;
143
144 if (!attr->index)
145 return sprintf(buf, "255\n");
146
147 ret = regmap_read(data->regmap, attr->index, &val);
148 if (ret < 0)
149 return ret;
150
151 return sprintf(buf, "%d\n", val);
152}
153
154static ssize_t pwm_store(struct device *dev, struct device_attribute *devattr,
155 const char *buf, size_t count)
156{
157 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
158 struct nct7802_data *data = dev_get_drvdata(dev);
159 int err;
160 u8 val;
161
162 err = kstrtou8(buf, 0, &val);
163 if (err < 0)
164 return err;
165
166 err = regmap_write(data->regmap, attr->index, val);
167 return err ? : count;
168}
169
170static ssize_t pwm_enable_show(struct device *dev,
171 struct device_attribute *attr, char *buf)
172{
173 struct nct7802_data *data = dev_get_drvdata(dev);
174 struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
175 unsigned int reg, enabled;
176 int ret;
177
178 ret = regmap_read(data->regmap, REG_SMARTFAN_EN(sattr->index), ®);
179 if (ret < 0)
180 return ret;
181 enabled = reg >> SMARTFAN_EN_SHIFT(sattr->index) & 1;
182 return sprintf(buf, "%u\n", enabled + 1);
183}
184
185static ssize_t pwm_enable_store(struct device *dev,
186 struct device_attribute *attr,
187 const char *buf, size_t count)
188{
189 struct nct7802_data *data = dev_get_drvdata(dev);
190 struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
191 u8 val;
192 int ret;
193
194 ret = kstrtou8(buf, 0, &val);
195 if (ret < 0)
196 return ret;
197 if (val < 1 || val > 2)
198 return -EINVAL;
199 ret = regmap_update_bits(data->regmap, REG_SMARTFAN_EN(sattr->index),
200 1 << SMARTFAN_EN_SHIFT(sattr->index),
201 (val - 1) << SMARTFAN_EN_SHIFT(sattr->index));
202 return ret ? : count;
203}
204
205static int nct7802_read_temp(struct nct7802_data *data,
206 u8 reg_temp, u8 reg_temp_low, int *temp)
207{
208 unsigned int t1, t2 = 0;
209 int err;
210
211 *temp = 0;
212
213 mutex_lock(&data->access_lock);
214 err = regmap_read(data->regmap, reg_temp, &t1);
215 if (err < 0)
216 goto abort;
217 t1 <<= 8;
218 if (reg_temp_low) { /* 11 bit data */
219 err = regmap_read(data->regmap, reg_temp_low, &t2);
220 if (err < 0)
221 goto abort;
222 }
223 t1 |= t2 & 0xe0;
224 *temp = (s16)t1 / 32 * 125;
225abort:
226 mutex_unlock(&data->access_lock);
227 return err;
228}
229
230static int nct7802_read_fan(struct nct7802_data *data, u8 reg_fan)
231{
232 unsigned int f1, f2;
233 int ret;
234
235 mutex_lock(&data->access_lock);
236 ret = regmap_read(data->regmap, reg_fan, &f1);
237 if (ret < 0)
238 goto abort;
239 ret = regmap_read(data->regmap, REG_FANCOUNT_LOW, &f2);
240 if (ret < 0)
241 goto abort;
242 ret = (f1 << 5) | (f2 >> 3);
243 /* convert fan count to rpm */
244 if (ret == 0x1fff) /* maximum value, assume fan is stopped */
245 ret = 0;
246 else if (ret)
247 ret = DIV_ROUND_CLOSEST(1350000U, ret);
248abort:
249 mutex_unlock(&data->access_lock);
250 return ret;
251}
252
253static int nct7802_read_fan_min(struct nct7802_data *data, u8 reg_fan_low,
254 u8 reg_fan_high)
255{
256 unsigned int f1, f2;
257 int ret;
258
259 mutex_lock(&data->access_lock);
260 ret = regmap_read(data->regmap, reg_fan_low, &f1);
261 if (ret < 0)
262 goto abort;
263 ret = regmap_read(data->regmap, reg_fan_high, &f2);
264 if (ret < 0)
265 goto abort;
266 ret = f1 | ((f2 & 0xf8) << 5);
267 /* convert fan count to rpm */
268 if (ret == 0x1fff) /* maximum value, assume no limit */
269 ret = 0;
270 else if (ret)
271 ret = DIV_ROUND_CLOSEST(1350000U, ret);
272 else
273 ret = 1350000U;
274abort:
275 mutex_unlock(&data->access_lock);
276 return ret;
277}
278
279static int nct7802_write_fan_min(struct nct7802_data *data, u8 reg_fan_low,
280 u8 reg_fan_high, unsigned long limit)
281{
282 int err;
283
284 if (limit)
285 limit = DIV_ROUND_CLOSEST(1350000U, limit);
286 else
287 limit = 0x1fff;
288 limit = clamp_val(limit, 0, 0x1fff);
289
290 mutex_lock(&data->access_lock);
291 err = regmap_write(data->regmap, reg_fan_low, limit & 0xff);
292 if (err < 0)
293 goto abort;
294
295 err = regmap_write(data->regmap, reg_fan_high, (limit & 0x1f00) >> 5);
296abort:
297 mutex_unlock(&data->access_lock);
298 return err;
299}
300
301static u8 nct7802_vmul[] = { 4, 2, 2, 2, 2 };
302
303static int nct7802_read_voltage(struct nct7802_data *data, int nr, int index)
304{
305 unsigned int v1, v2;
306 int ret;
307
308 mutex_lock(&data->access_lock);
309 if (index == 0) { /* voltage */
310 ret = regmap_read(data->regmap, REG_VOLTAGE[nr], &v1);
311 if (ret < 0)
312 goto abort;
313 ret = regmap_read(data->regmap, REG_VOLTAGE_LOW, &v2);
314 if (ret < 0)
315 goto abort;
316 ret = ((v1 << 2) | (v2 >> 6)) * nct7802_vmul[nr];
317 } else { /* limit */
318 int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr];
319
320 ret = regmap_read(data->regmap,
321 REG_VOLTAGE_LIMIT_LSB[index - 1][nr], &v1);
322 if (ret < 0)
323 goto abort;
324 ret = regmap_read(data->regmap, REG_VOLTAGE_LIMIT_MSB[nr],
325 &v2);
326 if (ret < 0)
327 goto abort;
328 ret = (v1 | ((v2 << shift) & 0x300)) * nct7802_vmul[nr];
329 }
330abort:
331 mutex_unlock(&data->access_lock);
332 return ret;
333}
334
335static int nct7802_write_voltage(struct nct7802_data *data, int nr, int index,
336 unsigned long voltage)
337{
338 int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr];
339 int err;
340
341 voltage = clamp_val(voltage, 0, 0x3ff * nct7802_vmul[nr]);
342 voltage = DIV_ROUND_CLOSEST(voltage, nct7802_vmul[nr]);
343
344 mutex_lock(&data->access_lock);
345 err = regmap_write(data->regmap,
346 REG_VOLTAGE_LIMIT_LSB[index - 1][nr],
347 voltage & 0xff);
348 if (err < 0)
349 goto abort;
350
351 err = regmap_update_bits(data->regmap, REG_VOLTAGE_LIMIT_MSB[nr],
352 0x0300 >> shift, (voltage & 0x0300) >> shift);
353abort:
354 mutex_unlock(&data->access_lock);
355 return err;
356}
357
358static ssize_t in_show(struct device *dev, struct device_attribute *attr,
359 char *buf)
360{
361 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
362 struct nct7802_data *data = dev_get_drvdata(dev);
363 int voltage;
364
365 voltage = nct7802_read_voltage(data, sattr->nr, sattr->index);
366 if (voltage < 0)
367 return voltage;
368
369 return sprintf(buf, "%d\n", voltage);
370}
371
372static ssize_t in_store(struct device *dev, struct device_attribute *attr,
373 const char *buf, size_t count)
374{
375 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
376 struct nct7802_data *data = dev_get_drvdata(dev);
377 int index = sattr->index;
378 int nr = sattr->nr;
379 unsigned long val;
380 int err;
381
382 err = kstrtoul(buf, 10, &val);
383 if (err < 0)
384 return err;
385
386 err = nct7802_write_voltage(data, nr, index, val);
387 return err ? : count;
388}
389
390static ssize_t in_alarm_show(struct device *dev, struct device_attribute *attr,
391 char *buf)
392{
393 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
394 struct nct7802_data *data = dev_get_drvdata(dev);
395 int volt, min, max, ret;
396 unsigned int val;
397
398 mutex_lock(&data->in_alarm_lock);
399
400 /*
401 * The SMI Voltage status register is the only register giving a status
402 * for voltages. A bit is set for each input crossing a threshold, in
403 * both direction, but the "inside" or "outside" limits info is not
404 * available. Also this register is cleared on read.
405 * Note: this is not explicitly spelled out in the datasheet, but
406 * from experiment.
407 * To deal with this we use a status cache with one validity bit and
408 * one status bit for each input. Validity is cleared at startup and
409 * each time the register reports a change, and the status is processed
410 * by software based on current input value and limits.
411 */
412 ret = regmap_read(data->regmap, 0x1e, &val); /* SMI Voltage status */
413 if (ret < 0)
414 goto abort;
415
416 /* invalidate cached status for all inputs crossing a threshold */
417 data->in_status &= ~((val & 0x0f) << 4);
418
419 /* if cached status for requested input is invalid, update it */
420 if (!(data->in_status & (0x10 << sattr->index))) {
421 ret = nct7802_read_voltage(data, sattr->nr, 0);
422 if (ret < 0)
423 goto abort;
424 volt = ret;
425
426 ret = nct7802_read_voltage(data, sattr->nr, 1);
427 if (ret < 0)
428 goto abort;
429 min = ret;
430
431 ret = nct7802_read_voltage(data, sattr->nr, 2);
432 if (ret < 0)
433 goto abort;
434 max = ret;
435
436 if (volt < min || volt > max)
437 data->in_status |= (1 << sattr->index);
438 else
439 data->in_status &= ~(1 << sattr->index);
440
441 data->in_status |= 0x10 << sattr->index;
442 }
443
444 ret = sprintf(buf, "%u\n", !!(data->in_status & (1 << sattr->index)));
445abort:
446 mutex_unlock(&data->in_alarm_lock);
447 return ret;
448}
449
450static ssize_t temp_show(struct device *dev, struct device_attribute *attr,
451 char *buf)
452{
453 struct nct7802_data *data = dev_get_drvdata(dev);
454 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
455 int err, temp;
456
457 err = nct7802_read_temp(data, sattr->nr, sattr->index, &temp);
458 if (err < 0)
459 return err;
460
461 return sprintf(buf, "%d\n", temp);
462}
463
464static ssize_t temp_store(struct device *dev, struct device_attribute *attr,
465 const char *buf, size_t count)
466{
467 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
468 struct nct7802_data *data = dev_get_drvdata(dev);
469 int nr = sattr->nr;
470 long val;
471 int err;
472
473 err = kstrtol(buf, 10, &val);
474 if (err < 0)
475 return err;
476
477 val = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000);
478
479 err = regmap_write(data->regmap, nr, val & 0xff);
480 return err ? : count;
481}
482
483static ssize_t fan_show(struct device *dev, struct device_attribute *attr,
484 char *buf)
485{
486 struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
487 struct nct7802_data *data = dev_get_drvdata(dev);
488 int speed;
489
490 speed = nct7802_read_fan(data, sattr->index);
491 if (speed < 0)
492 return speed;
493
494 return sprintf(buf, "%d\n", speed);
495}
496
497static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr,
498 char *buf)
499{
500 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
501 struct nct7802_data *data = dev_get_drvdata(dev);
502 int speed;
503
504 speed = nct7802_read_fan_min(data, sattr->nr, sattr->index);
505 if (speed < 0)
506 return speed;
507
508 return sprintf(buf, "%d\n", speed);
509}
510
511static ssize_t fan_min_store(struct device *dev,
512 struct device_attribute *attr, const char *buf,
513 size_t count)
514{
515 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
516 struct nct7802_data *data = dev_get_drvdata(dev);
517 unsigned long val;
518 int err;
519
520 err = kstrtoul(buf, 10, &val);
521 if (err < 0)
522 return err;
523
524 err = nct7802_write_fan_min(data, sattr->nr, sattr->index, val);
525 return err ? : count;
526}
527
528static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
529 char *buf)
530{
531 struct nct7802_data *data = dev_get_drvdata(dev);
532 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
533 int bit = sattr->index;
534 unsigned int val;
535 int ret;
536
537 ret = regmap_read(data->regmap, sattr->nr, &val);
538 if (ret < 0)
539 return ret;
540
541 return sprintf(buf, "%u\n", !!(val & (1 << bit)));
542}
543
544static ssize_t
545beep_show(struct device *dev, struct device_attribute *attr, char *buf)
546{
547 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
548 struct nct7802_data *data = dev_get_drvdata(dev);
549 unsigned int regval;
550 int err;
551
552 err = regmap_read(data->regmap, sattr->nr, ®val);
553 if (err)
554 return err;
555
556 return sprintf(buf, "%u\n", !!(regval & (1 << sattr->index)));
557}
558
559static ssize_t
560beep_store(struct device *dev, struct device_attribute *attr, const char *buf,
561 size_t count)
562{
563 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
564 struct nct7802_data *data = dev_get_drvdata(dev);
565 unsigned long val;
566 int err;
567
568 err = kstrtoul(buf, 10, &val);
569 if (err < 0)
570 return err;
571 if (val > 1)
572 return -EINVAL;
573
574 err = regmap_update_bits(data->regmap, sattr->nr, 1 << sattr->index,
575 val ? 1 << sattr->index : 0);
576 return err ? : count;
577}
578
579static SENSOR_DEVICE_ATTR_RW(temp1_type, temp_type, 0);
580static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0x01, REG_TEMP_LSB);
581static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 0x31, 0);
582static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0x30, 0);
583static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 0x3a, 0);
584
585static SENSOR_DEVICE_ATTR_RW(temp2_type, temp_type, 1);
586static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 0x02, REG_TEMP_LSB);
587static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 0x33, 0);
588static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 0x32, 0);
589static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 0x3b, 0);
590
591static SENSOR_DEVICE_ATTR_RW(temp3_type, temp_type, 2);
592static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 0x03, REG_TEMP_LSB);
593static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 0x35, 0);
594static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 0x34, 0);
595static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 0x3c, 0);
596
597static SENSOR_DEVICE_ATTR_2_RO(temp4_input, temp, 0x04, 0);
598static SENSOR_DEVICE_ATTR_2_RW(temp4_min, temp, 0x37, 0);
599static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 0x36, 0);
600static SENSOR_DEVICE_ATTR_2_RW(temp4_crit, temp, 0x3d, 0);
601
602static SENSOR_DEVICE_ATTR_2_RO(temp5_input, temp, 0x06, REG_TEMP_PECI_LSB);
603static SENSOR_DEVICE_ATTR_2_RW(temp5_min, temp, 0x39, 0);
604static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 0x38, 0);
605static SENSOR_DEVICE_ATTR_2_RW(temp5_crit, temp, 0x3e, 0);
606
607static SENSOR_DEVICE_ATTR_2_RO(temp6_input, temp, 0x07, REG_TEMP_PECI_LSB);
608
609static SENSOR_DEVICE_ATTR_2_RO(temp1_min_alarm, alarm, 0x18, 0);
610static SENSOR_DEVICE_ATTR_2_RO(temp2_min_alarm, alarm, 0x18, 1);
611static SENSOR_DEVICE_ATTR_2_RO(temp3_min_alarm, alarm, 0x18, 2);
612static SENSOR_DEVICE_ATTR_2_RO(temp4_min_alarm, alarm, 0x18, 3);
613static SENSOR_DEVICE_ATTR_2_RO(temp5_min_alarm, alarm, 0x18, 4);
614
615static SENSOR_DEVICE_ATTR_2_RO(temp1_max_alarm, alarm, 0x19, 0);
616static SENSOR_DEVICE_ATTR_2_RO(temp2_max_alarm, alarm, 0x19, 1);
617static SENSOR_DEVICE_ATTR_2_RO(temp3_max_alarm, alarm, 0x19, 2);
618static SENSOR_DEVICE_ATTR_2_RO(temp4_max_alarm, alarm, 0x19, 3);
619static SENSOR_DEVICE_ATTR_2_RO(temp5_max_alarm, alarm, 0x19, 4);
620
621static SENSOR_DEVICE_ATTR_2_RO(temp1_crit_alarm, alarm, 0x1b, 0);
622static SENSOR_DEVICE_ATTR_2_RO(temp2_crit_alarm, alarm, 0x1b, 1);
623static SENSOR_DEVICE_ATTR_2_RO(temp3_crit_alarm, alarm, 0x1b, 2);
624static SENSOR_DEVICE_ATTR_2_RO(temp4_crit_alarm, alarm, 0x1b, 3);
625static SENSOR_DEVICE_ATTR_2_RO(temp5_crit_alarm, alarm, 0x1b, 4);
626
627static SENSOR_DEVICE_ATTR_2_RO(temp1_fault, alarm, 0x17, 0);
628static SENSOR_DEVICE_ATTR_2_RO(temp2_fault, alarm, 0x17, 1);
629static SENSOR_DEVICE_ATTR_2_RO(temp3_fault, alarm, 0x17, 2);
630
631static SENSOR_DEVICE_ATTR_2_RW(temp1_beep, beep, 0x5c, 0);
632static SENSOR_DEVICE_ATTR_2_RW(temp2_beep, beep, 0x5c, 1);
633static SENSOR_DEVICE_ATTR_2_RW(temp3_beep, beep, 0x5c, 2);
634static SENSOR_DEVICE_ATTR_2_RW(temp4_beep, beep, 0x5c, 3);
635static SENSOR_DEVICE_ATTR_2_RW(temp5_beep, beep, 0x5c, 4);
636static SENSOR_DEVICE_ATTR_2_RW(temp6_beep, beep, 0x5c, 5);
637
638static struct attribute *nct7802_temp_attrs[] = {
639 &sensor_dev_attr_temp1_type.dev_attr.attr,
640 &sensor_dev_attr_temp1_input.dev_attr.attr,
641 &sensor_dev_attr_temp1_min.dev_attr.attr,
642 &sensor_dev_attr_temp1_max.dev_attr.attr,
643 &sensor_dev_attr_temp1_crit.dev_attr.attr,
644 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
645 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
646 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
647 &sensor_dev_attr_temp1_fault.dev_attr.attr,
648 &sensor_dev_attr_temp1_beep.dev_attr.attr,
649
650 &sensor_dev_attr_temp2_type.dev_attr.attr, /* 10 */
651 &sensor_dev_attr_temp2_input.dev_attr.attr,
652 &sensor_dev_attr_temp2_min.dev_attr.attr,
653 &sensor_dev_attr_temp2_max.dev_attr.attr,
654 &sensor_dev_attr_temp2_crit.dev_attr.attr,
655 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
656 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
657 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
658 &sensor_dev_attr_temp2_fault.dev_attr.attr,
659 &sensor_dev_attr_temp2_beep.dev_attr.attr,
660
661 &sensor_dev_attr_temp3_type.dev_attr.attr, /* 20 */
662 &sensor_dev_attr_temp3_input.dev_attr.attr,
663 &sensor_dev_attr_temp3_min.dev_attr.attr,
664 &sensor_dev_attr_temp3_max.dev_attr.attr,
665 &sensor_dev_attr_temp3_crit.dev_attr.attr,
666 &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
667 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
668 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
669 &sensor_dev_attr_temp3_fault.dev_attr.attr,
670 &sensor_dev_attr_temp3_beep.dev_attr.attr,
671
672 &sensor_dev_attr_temp4_input.dev_attr.attr, /* 30 */
673 &sensor_dev_attr_temp4_min.dev_attr.attr,
674 &sensor_dev_attr_temp4_max.dev_attr.attr,
675 &sensor_dev_attr_temp4_crit.dev_attr.attr,
676 &sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
677 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
678 &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
679 &sensor_dev_attr_temp4_beep.dev_attr.attr,
680
681 &sensor_dev_attr_temp5_input.dev_attr.attr, /* 38 */
682 &sensor_dev_attr_temp5_min.dev_attr.attr,
683 &sensor_dev_attr_temp5_max.dev_attr.attr,
684 &sensor_dev_attr_temp5_crit.dev_attr.attr,
685 &sensor_dev_attr_temp5_min_alarm.dev_attr.attr,
686 &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
687 &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
688 &sensor_dev_attr_temp5_beep.dev_attr.attr,
689
690 &sensor_dev_attr_temp6_input.dev_attr.attr, /* 46 */
691 &sensor_dev_attr_temp6_beep.dev_attr.attr,
692
693 NULL
694};
695
696static umode_t nct7802_temp_is_visible(struct kobject *kobj,
697 struct attribute *attr, int index)
698{
699 struct device *dev = kobj_to_dev(kobj);
700 struct nct7802_data *data = dev_get_drvdata(dev);
701 unsigned int reg;
702 int err;
703
704 err = regmap_read(data->regmap, REG_MODE, ®);
705 if (err < 0)
706 return 0;
707
708 if (index < 10 &&
709 (reg & 03) != 0x01 && (reg & 0x03) != 0x02) /* RD1 */
710 return 0;
711
712 if (index >= 10 && index < 20 &&
713 (reg & 0x0c) != 0x04 && (reg & 0x0c) != 0x08) /* RD2 */
714 return 0;
715 if (index >= 20 && index < 30 && (reg & 0x30) != 0x20) /* RD3 */
716 return 0;
717
718 if (index >= 30 && index < 38) /* local */
719 return attr->mode;
720
721 err = regmap_read(data->regmap, REG_PECI_ENABLE, ®);
722 if (err < 0)
723 return 0;
724
725 if (index >= 38 && index < 46 && !(reg & 0x01)) /* PECI 0 */
726 return 0;
727
728 if (index >= 46 && !(reg & 0x02)) /* PECI 1 */
729 return 0;
730
731 return attr->mode;
732}
733
734static const struct attribute_group nct7802_temp_group = {
735 .attrs = nct7802_temp_attrs,
736 .is_visible = nct7802_temp_is_visible,
737};
738
739static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, 0, 0);
740static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, 0, 1);
741static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, 0, 2);
742static SENSOR_DEVICE_ATTR_2_RO(in0_alarm, in_alarm, 0, 3);
743static SENSOR_DEVICE_ATTR_2_RW(in0_beep, beep, 0x5a, 3);
744
745static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, 1, 0);
746
747static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, 2, 0);
748static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, 2, 1);
749static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, 2, 2);
750static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, in_alarm, 2, 0);
751static SENSOR_DEVICE_ATTR_2_RW(in2_beep, beep, 0x5a, 0);
752
753static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, 3, 0);
754static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, 3, 1);
755static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, 3, 2);
756static SENSOR_DEVICE_ATTR_2_RO(in3_alarm, in_alarm, 3, 1);
757static SENSOR_DEVICE_ATTR_2_RW(in3_beep, beep, 0x5a, 1);
758
759static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, 4, 0);
760static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, 4, 1);
761static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, 4, 2);
762static SENSOR_DEVICE_ATTR_2_RO(in4_alarm, in_alarm, 4, 2);
763static SENSOR_DEVICE_ATTR_2_RW(in4_beep, beep, 0x5a, 2);
764
765static struct attribute *nct7802_in_attrs[] = {
766 &sensor_dev_attr_in0_input.dev_attr.attr,
767 &sensor_dev_attr_in0_min.dev_attr.attr,
768 &sensor_dev_attr_in0_max.dev_attr.attr,
769 &sensor_dev_attr_in0_alarm.dev_attr.attr,
770 &sensor_dev_attr_in0_beep.dev_attr.attr,
771
772 &sensor_dev_attr_in1_input.dev_attr.attr, /* 5 */
773
774 &sensor_dev_attr_in2_input.dev_attr.attr, /* 6 */
775 &sensor_dev_attr_in2_min.dev_attr.attr,
776 &sensor_dev_attr_in2_max.dev_attr.attr,
777 &sensor_dev_attr_in2_alarm.dev_attr.attr,
778 &sensor_dev_attr_in2_beep.dev_attr.attr,
779
780 &sensor_dev_attr_in3_input.dev_attr.attr, /* 11 */
781 &sensor_dev_attr_in3_min.dev_attr.attr,
782 &sensor_dev_attr_in3_max.dev_attr.attr,
783 &sensor_dev_attr_in3_alarm.dev_attr.attr,
784 &sensor_dev_attr_in3_beep.dev_attr.attr,
785
786 &sensor_dev_attr_in4_input.dev_attr.attr, /* 16 */
787 &sensor_dev_attr_in4_min.dev_attr.attr,
788 &sensor_dev_attr_in4_max.dev_attr.attr,
789 &sensor_dev_attr_in4_alarm.dev_attr.attr,
790 &sensor_dev_attr_in4_beep.dev_attr.attr,
791
792 NULL,
793};
794
795static umode_t nct7802_in_is_visible(struct kobject *kobj,
796 struct attribute *attr, int index)
797{
798 struct device *dev = kobj_to_dev(kobj);
799 struct nct7802_data *data = dev_get_drvdata(dev);
800 unsigned int reg;
801 int err;
802
803 if (index < 6) /* VCC, VCORE */
804 return attr->mode;
805
806 err = regmap_read(data->regmap, REG_MODE, ®);
807 if (err < 0)
808 return 0;
809
810 if (index >= 6 && index < 11 && (reg & 0x03) != 0x03) /* VSEN1 */
811 return 0;
812 if (index >= 11 && index < 16 && (reg & 0x0c) != 0x0c) /* VSEN2 */
813 return 0;
814 if (index >= 16 && (reg & 0x30) != 0x30) /* VSEN3 */
815 return 0;
816
817 return attr->mode;
818}
819
820static const struct attribute_group nct7802_in_group = {
821 .attrs = nct7802_in_attrs,
822 .is_visible = nct7802_in_is_visible,
823};
824
825static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0x10);
826static SENSOR_DEVICE_ATTR_2_RW(fan1_min, fan_min, 0x49, 0x4c);
827static SENSOR_DEVICE_ATTR_2_RO(fan1_alarm, alarm, 0x1a, 0);
828static SENSOR_DEVICE_ATTR_2_RW(fan1_beep, beep, 0x5b, 0);
829static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 0x11);
830static SENSOR_DEVICE_ATTR_2_RW(fan2_min, fan_min, 0x4a, 0x4d);
831static SENSOR_DEVICE_ATTR_2_RO(fan2_alarm, alarm, 0x1a, 1);
832static SENSOR_DEVICE_ATTR_2_RW(fan2_beep, beep, 0x5b, 1);
833static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 0x12);
834static SENSOR_DEVICE_ATTR_2_RW(fan3_min, fan_min, 0x4b, 0x4e);
835static SENSOR_DEVICE_ATTR_2_RO(fan3_alarm, alarm, 0x1a, 2);
836static SENSOR_DEVICE_ATTR_2_RW(fan3_beep, beep, 0x5b, 2);
837
838/* 7.2.89 Fan Control Output Type */
839static SENSOR_DEVICE_ATTR_RO(pwm1_mode, pwm_mode, 0);
840static SENSOR_DEVICE_ATTR_RO(pwm2_mode, pwm_mode, 1);
841static SENSOR_DEVICE_ATTR_RO(pwm3_mode, pwm_mode, 2);
842
843/* 7.2.91... Fan Control Output Value */
844static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, REG_PWM(0));
845static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, REG_PWM(1));
846static SENSOR_DEVICE_ATTR_RW(pwm3, pwm, REG_PWM(2));
847
848/* 7.2.95... Temperature to Fan mapping Relationships Register */
849static SENSOR_DEVICE_ATTR_RW(pwm1_enable, pwm_enable, 0);
850static SENSOR_DEVICE_ATTR_RW(pwm2_enable, pwm_enable, 1);
851static SENSOR_DEVICE_ATTR_RW(pwm3_enable, pwm_enable, 2);
852
853static struct attribute *nct7802_fan_attrs[] = {
854 &sensor_dev_attr_fan1_input.dev_attr.attr,
855 &sensor_dev_attr_fan1_min.dev_attr.attr,
856 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
857 &sensor_dev_attr_fan1_beep.dev_attr.attr,
858 &sensor_dev_attr_fan2_input.dev_attr.attr,
859 &sensor_dev_attr_fan2_min.dev_attr.attr,
860 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
861 &sensor_dev_attr_fan2_beep.dev_attr.attr,
862 &sensor_dev_attr_fan3_input.dev_attr.attr,
863 &sensor_dev_attr_fan3_min.dev_attr.attr,
864 &sensor_dev_attr_fan3_alarm.dev_attr.attr,
865 &sensor_dev_attr_fan3_beep.dev_attr.attr,
866
867 NULL
868};
869
870static umode_t nct7802_fan_is_visible(struct kobject *kobj,
871 struct attribute *attr, int index)
872{
873 struct device *dev = kobj_to_dev(kobj);
874 struct nct7802_data *data = dev_get_drvdata(dev);
875 int fan = index / 4; /* 4 attributes per fan */
876 unsigned int reg;
877 int err;
878
879 err = regmap_read(data->regmap, REG_FAN_ENABLE, ®);
880 if (err < 0 || !(reg & (1 << fan)))
881 return 0;
882
883 return attr->mode;
884}
885
886static const struct attribute_group nct7802_fan_group = {
887 .attrs = nct7802_fan_attrs,
888 .is_visible = nct7802_fan_is_visible,
889};
890
891static struct attribute *nct7802_pwm_attrs[] = {
892 &sensor_dev_attr_pwm1_enable.dev_attr.attr,
893 &sensor_dev_attr_pwm1_mode.dev_attr.attr,
894 &sensor_dev_attr_pwm1.dev_attr.attr,
895 &sensor_dev_attr_pwm2_enable.dev_attr.attr,
896 &sensor_dev_attr_pwm2_mode.dev_attr.attr,
897 &sensor_dev_attr_pwm2.dev_attr.attr,
898 &sensor_dev_attr_pwm3_enable.dev_attr.attr,
899 &sensor_dev_attr_pwm3_mode.dev_attr.attr,
900 &sensor_dev_attr_pwm3.dev_attr.attr,
901 NULL
902};
903
904static const struct attribute_group nct7802_pwm_group = {
905 .attrs = nct7802_pwm_attrs,
906};
907
908/* 7.2.115... 0x80-0x83, 0x84 Temperature (X-axis) transition */
909static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point1_temp, temp, 0x80, 0);
910static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point2_temp, temp, 0x81, 0);
911static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point3_temp, temp, 0x82, 0);
912static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point4_temp, temp, 0x83, 0);
913static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point5_temp, temp, 0x84, 0);
914
915/* 7.2.120... 0x85-0x88 PWM (Y-axis) transition */
916static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point1_pwm, pwm, 0x85);
917static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_pwm, pwm, 0x86);
918static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point3_pwm, pwm, 0x87);
919static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point4_pwm, pwm, 0x88);
920static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point5_pwm, pwm, 0);
921
922/* 7.2.124 Table 2 X-axis Transition Point 1 Register */
923static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point1_temp, temp, 0x90, 0);
924static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point2_temp, temp, 0x91, 0);
925static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point3_temp, temp, 0x92, 0);
926static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point4_temp, temp, 0x93, 0);
927static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point5_temp, temp, 0x94, 0);
928
929/* 7.2.129 Table 2 Y-axis Transition Point 1 Register */
930static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point1_pwm, pwm, 0x95);
931static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point2_pwm, pwm, 0x96);
932static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point3_pwm, pwm, 0x97);
933static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point4_pwm, pwm, 0x98);
934static SENSOR_DEVICE_ATTR_RO(pwm2_auto_point5_pwm, pwm, 0);
935
936/* 7.2.133 Table 3 X-axis Transition Point 1 Register */
937static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point1_temp, temp, 0xA0, 0);
938static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point2_temp, temp, 0xA1, 0);
939static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point3_temp, temp, 0xA2, 0);
940static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point4_temp, temp, 0xA3, 0);
941static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point5_temp, temp, 0xA4, 0);
942
943/* 7.2.138 Table 3 Y-axis Transition Point 1 Register */
944static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point1_pwm, pwm, 0xA5);
945static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point2_pwm, pwm, 0xA6);
946static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point3_pwm, pwm, 0xA7);
947static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point4_pwm, pwm, 0xA8);
948static SENSOR_DEVICE_ATTR_RO(pwm3_auto_point5_pwm, pwm, 0);
949
950static struct attribute *nct7802_auto_point_attrs[] = {
951 &sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
952 &sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
953 &sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr,
954 &sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr,
955 &sensor_dev_attr_pwm1_auto_point5_temp.dev_attr.attr,
956
957 &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
958 &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
959 &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
960 &sensor_dev_attr_pwm1_auto_point4_pwm.dev_attr.attr,
961 &sensor_dev_attr_pwm1_auto_point5_pwm.dev_attr.attr,
962
963 &sensor_dev_attr_pwm2_auto_point1_temp.dev_attr.attr,
964 &sensor_dev_attr_pwm2_auto_point2_temp.dev_attr.attr,
965 &sensor_dev_attr_pwm2_auto_point3_temp.dev_attr.attr,
966 &sensor_dev_attr_pwm2_auto_point4_temp.dev_attr.attr,
967 &sensor_dev_attr_pwm2_auto_point5_temp.dev_attr.attr,
968
969 &sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr,
970 &sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr,
971 &sensor_dev_attr_pwm2_auto_point3_pwm.dev_attr.attr,
972 &sensor_dev_attr_pwm2_auto_point4_pwm.dev_attr.attr,
973 &sensor_dev_attr_pwm2_auto_point5_pwm.dev_attr.attr,
974
975 &sensor_dev_attr_pwm3_auto_point1_temp.dev_attr.attr,
976 &sensor_dev_attr_pwm3_auto_point2_temp.dev_attr.attr,
977 &sensor_dev_attr_pwm3_auto_point3_temp.dev_attr.attr,
978 &sensor_dev_attr_pwm3_auto_point4_temp.dev_attr.attr,
979 &sensor_dev_attr_pwm3_auto_point5_temp.dev_attr.attr,
980
981 &sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr,
982 &sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr,
983 &sensor_dev_attr_pwm3_auto_point3_pwm.dev_attr.attr,
984 &sensor_dev_attr_pwm3_auto_point4_pwm.dev_attr.attr,
985 &sensor_dev_attr_pwm3_auto_point5_pwm.dev_attr.attr,
986
987 NULL
988};
989
990static const struct attribute_group nct7802_auto_point_group = {
991 .attrs = nct7802_auto_point_attrs,
992};
993
994static const struct attribute_group *nct7802_groups[] = {
995 &nct7802_temp_group,
996 &nct7802_in_group,
997 &nct7802_fan_group,
998 &nct7802_pwm_group,
999 &nct7802_auto_point_group,
1000 NULL
1001};
1002
1003static int nct7802_detect(struct i2c_client *client,
1004 struct i2c_board_info *info)
1005{
1006 int reg;
1007
1008 /*
1009 * Chip identification registers are only available in bank 0,
1010 * so only attempt chip detection if bank 0 is selected
1011 */
1012 reg = i2c_smbus_read_byte_data(client, REG_BANK);
1013 if (reg != 0x00)
1014 return -ENODEV;
1015
1016 reg = i2c_smbus_read_byte_data(client, REG_VENDOR_ID);
1017 if (reg != 0x50)
1018 return -ENODEV;
1019
1020 reg = i2c_smbus_read_byte_data(client, REG_CHIP_ID);
1021 if (reg != 0xc3)
1022 return -ENODEV;
1023
1024 reg = i2c_smbus_read_byte_data(client, REG_VERSION_ID);
1025 if (reg < 0 || (reg & 0xf0) != 0x20)
1026 return -ENODEV;
1027
1028 /* Also validate lower bits of voltage and temperature registers */
1029 reg = i2c_smbus_read_byte_data(client, REG_TEMP_LSB);
1030 if (reg < 0 || (reg & 0x1f))
1031 return -ENODEV;
1032
1033 reg = i2c_smbus_read_byte_data(client, REG_TEMP_PECI_LSB);
1034 if (reg < 0 || (reg & 0x3f))
1035 return -ENODEV;
1036
1037 reg = i2c_smbus_read_byte_data(client, REG_VOLTAGE_LOW);
1038 if (reg < 0 || (reg & 0x3f))
1039 return -ENODEV;
1040
1041 strscpy(info->type, "nct7802", I2C_NAME_SIZE);
1042 return 0;
1043}
1044
1045static bool nct7802_regmap_is_volatile(struct device *dev, unsigned int reg)
1046{
1047 return (reg != REG_BANK && reg <= 0x20) ||
1048 (reg >= REG_PWM(0) && reg <= REG_PWM(2));
1049}
1050
1051static const struct regmap_config nct7802_regmap_config = {
1052 .reg_bits = 8,
1053 .val_bits = 8,
1054 .cache_type = REGCACHE_MAPLE,
1055 .volatile_reg = nct7802_regmap_is_volatile,
1056};
1057
1058static int nct7802_get_channel_config(struct device *dev,
1059 struct device_node *node, u8 *mode_mask,
1060 u8 *mode_val)
1061{
1062 u32 reg;
1063 const char *type_str, *md_str;
1064 u8 md;
1065
1066 if (!node->name || of_node_cmp(node->name, "channel"))
1067 return 0;
1068
1069 if (of_property_read_u32(node, "reg", ®)) {
1070 dev_err(dev, "Could not read reg value for '%s'\n",
1071 node->full_name);
1072 return -EINVAL;
1073 }
1074
1075 if (reg > 3) {
1076 dev_err(dev, "Invalid reg (%u) in '%s'\n", reg,
1077 node->full_name);
1078 return -EINVAL;
1079 }
1080
1081 if (reg == 0) {
1082 if (!of_device_is_available(node))
1083 *mode_val &= ~MODE_LTD_EN;
1084 else
1085 *mode_val |= MODE_LTD_EN;
1086 *mode_mask |= MODE_LTD_EN;
1087 return 0;
1088 }
1089
1090 /* At this point we have reg >= 1 && reg <= 3 */
1091
1092 if (!of_device_is_available(node)) {
1093 *mode_val &= ~(MODE_RTD_MASK << MODE_BIT_OFFSET_RTD(reg - 1));
1094 *mode_mask |= MODE_RTD_MASK << MODE_BIT_OFFSET_RTD(reg - 1);
1095 return 0;
1096 }
1097
1098 if (of_property_read_string(node, "sensor-type", &type_str)) {
1099 dev_err(dev, "No type for '%s'\n", node->full_name);
1100 return -EINVAL;
1101 }
1102
1103 if (!strcmp(type_str, "voltage")) {
1104 *mode_val |= (RTD_MODE_VOLTAGE & MODE_RTD_MASK)
1105 << MODE_BIT_OFFSET_RTD(reg - 1);
1106 *mode_mask |= MODE_RTD_MASK << MODE_BIT_OFFSET_RTD(reg - 1);
1107 return 0;
1108 }
1109
1110 if (strcmp(type_str, "temperature")) {
1111 dev_err(dev, "Invalid type '%s' for '%s'\n", type_str,
1112 node->full_name);
1113 return -EINVAL;
1114 }
1115
1116 if (reg == 3) {
1117 /* RTD3 only supports thermistor mode */
1118 md = RTD_MODE_THERMISTOR;
1119 } else {
1120 if (of_property_read_string(node, "temperature-mode",
1121 &md_str)) {
1122 dev_err(dev, "No mode for '%s'\n", node->full_name);
1123 return -EINVAL;
1124 }
1125
1126 if (!strcmp(md_str, "thermal-diode"))
1127 md = RTD_MODE_CURRENT;
1128 else if (!strcmp(md_str, "thermistor"))
1129 md = RTD_MODE_THERMISTOR;
1130 else {
1131 dev_err(dev, "Invalid mode '%s' for '%s'\n", md_str,
1132 node->full_name);
1133 return -EINVAL;
1134 }
1135 }
1136
1137 *mode_val |= (md & MODE_RTD_MASK) << MODE_BIT_OFFSET_RTD(reg - 1);
1138 *mode_mask |= MODE_RTD_MASK << MODE_BIT_OFFSET_RTD(reg - 1);
1139
1140 return 0;
1141}
1142
1143static int nct7802_configure_channels(struct device *dev,
1144 struct nct7802_data *data)
1145{
1146 /* Enable local temperature sensor by default */
1147 u8 mode_mask = MODE_LTD_EN, mode_val = MODE_LTD_EN;
1148 struct device_node *node;
1149 int err;
1150
1151 if (dev->of_node) {
1152 for_each_child_of_node(dev->of_node, node) {
1153 err = nct7802_get_channel_config(dev, node, &mode_mask,
1154 &mode_val);
1155 if (err) {
1156 of_node_put(node);
1157 return err;
1158 }
1159 }
1160 }
1161
1162 return regmap_update_bits(data->regmap, REG_MODE, mode_mask, mode_val);
1163}
1164
1165static int nct7802_init_chip(struct device *dev, struct nct7802_data *data)
1166{
1167 int err;
1168
1169 /* Enable ADC */
1170 err = regmap_update_bits(data->regmap, REG_START, 0x01, 0x01);
1171 if (err)
1172 return err;
1173
1174 err = nct7802_configure_channels(dev, data);
1175 if (err)
1176 return err;
1177
1178 /* Enable Vcore and VCC voltage monitoring */
1179 return regmap_update_bits(data->regmap, REG_VMON_ENABLE, 0x03, 0x03);
1180}
1181
1182static int nct7802_probe(struct i2c_client *client)
1183{
1184 struct device *dev = &client->dev;
1185 struct nct7802_data *data;
1186 struct device *hwmon_dev;
1187 int ret;
1188
1189 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
1190 if (data == NULL)
1191 return -ENOMEM;
1192
1193 data->regmap = devm_regmap_init_i2c(client, &nct7802_regmap_config);
1194 if (IS_ERR(data->regmap))
1195 return PTR_ERR(data->regmap);
1196
1197 mutex_init(&data->access_lock);
1198 mutex_init(&data->in_alarm_lock);
1199
1200 ret = nct7802_init_chip(dev, data);
1201 if (ret < 0)
1202 return ret;
1203
1204 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
1205 data,
1206 nct7802_groups);
1207 return PTR_ERR_OR_ZERO(hwmon_dev);
1208}
1209
1210static const unsigned short nct7802_address_list[] = {
1211 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END
1212};
1213
1214static const struct i2c_device_id nct7802_idtable[] = {
1215 { "nct7802", 0 },
1216 { }
1217};
1218MODULE_DEVICE_TABLE(i2c, nct7802_idtable);
1219
1220static struct i2c_driver nct7802_driver = {
1221 .class = I2C_CLASS_HWMON,
1222 .driver = {
1223 .name = DRVNAME,
1224 },
1225 .detect = nct7802_detect,
1226 .probe = nct7802_probe,
1227 .id_table = nct7802_idtable,
1228 .address_list = nct7802_address_list,
1229};
1230
1231module_i2c_driver(nct7802_driver);
1232
1233MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
1234MODULE_DESCRIPTION("NCT7802Y Hardware Monitoring Driver");
1235MODULE_LICENSE("GPL v2");