xref: /linux/drivers/hwmon/nct7802.c (revision 3a39d672e7f48b8d6b91a09afa4b55352773b4b5)
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 
23 static const u8 REG_VOLTAGE[5] = { 0x09, 0x0a, 0x0c, 0x0d, 0x0e };
24 
25 static const u8 REG_VOLTAGE_LIMIT_LSB[2][5] = {
26 	{ 0x46, 0x00, 0x40, 0x42, 0x44 },
27 	{ 0x45, 0x00, 0x3f, 0x41, 0x43 },
28 };
29 
30 static const u8 REG_VOLTAGE_LIMIT_MSB[5] = { 0x48, 0x00, 0x47, 0x47, 0x48 };
31 
32 static 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 
75 struct 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 
temp_type_show(struct device * dev,struct device_attribute * attr,char * buf)82 static 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 
temp_type_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)97 static 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 
pwm_mode_show(struct device * dev,struct device_attribute * attr,char * buf)118 static 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, &regval);
130 	if (ret < 0)
131 		return ret;
132 
133 	return sprintf(buf, "%u\n", !(regval & (1 << sattr->index)));
134 }
135 
pwm_show(struct device * dev,struct device_attribute * devattr,char * buf)136 static 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 
pwm_store(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)154 static 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 
pwm_enable_show(struct device * dev,struct device_attribute * attr,char * buf)170 static 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), &reg);
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 
pwm_enable_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)185 static 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 
nct7802_read_temp(struct nct7802_data * data,u8 reg_temp,u8 reg_temp_low,int * temp)205 static 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;
225 abort:
226 	mutex_unlock(&data->access_lock);
227 	return err;
228 }
229 
nct7802_read_fan(struct nct7802_data * data,u8 reg_fan)230 static int nct7802_read_fan(struct nct7802_data *data, u8 reg_fan)
231 {
232 	unsigned int regs[2] = {reg_fan, REG_FANCOUNT_LOW};
233 	u8 f[2];
234 	int ret;
235 
236 	ret = regmap_multi_reg_read(data->regmap, regs, f, 2);
237 	if (ret)
238 		return ret;
239 	ret = (f[0] << 5) | (f[1] >> 3);
240 	/* convert fan count to rpm */
241 	if (ret == 0x1fff)	/* maximum value, assume fan is stopped */
242 		ret = 0;
243 	else if (ret)
244 		ret = DIV_ROUND_CLOSEST(1350000U, ret);
245 	return ret;
246 }
247 
nct7802_read_fan_min(struct nct7802_data * data,u8 reg_fan_low,u8 reg_fan_high)248 static int nct7802_read_fan_min(struct nct7802_data *data, u8 reg_fan_low,
249 				u8 reg_fan_high)
250 {
251 	unsigned int regs[2] = {reg_fan_low, reg_fan_high};
252 	u8 f[2];
253 	int ret;
254 
255 	ret = regmap_multi_reg_read(data->regmap, regs, f, 2);
256 	if (ret < 0)
257 		return ret;
258 
259 	ret = f[0] | ((f[1] & 0xf8) << 5);
260 	/* convert fan count to rpm */
261 	if (ret == 0x1fff)	/* maximum value, assume no limit */
262 		ret = 0;
263 	else if (ret)
264 		ret = DIV_ROUND_CLOSEST(1350000U, ret);
265 	else
266 		ret = 1350000U;
267 	return ret;
268 }
269 
nct7802_write_fan_min(struct nct7802_data * data,u8 reg_fan_low,u8 reg_fan_high,unsigned long limit)270 static int nct7802_write_fan_min(struct nct7802_data *data, u8 reg_fan_low,
271 				 u8 reg_fan_high, unsigned long limit)
272 {
273 	int err;
274 
275 	if (limit)
276 		limit = DIV_ROUND_CLOSEST(1350000U, limit);
277 	else
278 		limit = 0x1fff;
279 	limit = clamp_val(limit, 0, 0x1fff);
280 
281 	mutex_lock(&data->access_lock);
282 	err = regmap_write(data->regmap, reg_fan_low, limit & 0xff);
283 	if (err < 0)
284 		goto abort;
285 
286 	err = regmap_write(data->regmap, reg_fan_high, (limit & 0x1f00) >> 5);
287 abort:
288 	mutex_unlock(&data->access_lock);
289 	return err;
290 }
291 
292 static u8 nct7802_vmul[] = { 4, 2, 2, 2, 2 };
293 
nct7802_read_voltage(struct nct7802_data * data,int nr,int index)294 static int nct7802_read_voltage(struct nct7802_data *data, int nr, int index)
295 {
296 	u8 v[2];
297 	int ret;
298 
299 	if (index == 0) {	/* voltage */
300 		unsigned int regs[2] = {REG_VOLTAGE[nr], REG_VOLTAGE_LOW};
301 
302 		ret = regmap_multi_reg_read(data->regmap, regs, v, 2);
303 		if (ret < 0)
304 			return ret;
305 		ret = ((v[0] << 2) | (v[1] >> 6)) * nct7802_vmul[nr];
306 	}  else {	/* limit */
307 		int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr];
308 		unsigned int regs[2] = {REG_VOLTAGE_LIMIT_LSB[index - 1][nr],
309 					REG_VOLTAGE_LIMIT_MSB[nr]};
310 
311 		ret = regmap_multi_reg_read(data->regmap, regs, v, 2);
312 		if (ret < 0)
313 			return ret;
314 		ret = (v[0] | ((v[1] << shift) & 0x300)) * nct7802_vmul[nr];
315 	}
316 	return ret;
317 }
318 
nct7802_write_voltage(struct nct7802_data * data,int nr,int index,unsigned long voltage)319 static int nct7802_write_voltage(struct nct7802_data *data, int nr, int index,
320 				 unsigned long voltage)
321 {
322 	int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr];
323 	int err;
324 
325 	voltage = clamp_val(voltage, 0, 0x3ff * nct7802_vmul[nr]);
326 	voltage = DIV_ROUND_CLOSEST(voltage, nct7802_vmul[nr]);
327 
328 	mutex_lock(&data->access_lock);
329 	err = regmap_write(data->regmap,
330 			   REG_VOLTAGE_LIMIT_LSB[index - 1][nr],
331 			   voltage & 0xff);
332 	if (err < 0)
333 		goto abort;
334 
335 	err = regmap_update_bits(data->regmap, REG_VOLTAGE_LIMIT_MSB[nr],
336 				 0x0300 >> shift, (voltage & 0x0300) >> shift);
337 abort:
338 	mutex_unlock(&data->access_lock);
339 	return err;
340 }
341 
in_show(struct device * dev,struct device_attribute * attr,char * buf)342 static ssize_t in_show(struct device *dev, struct device_attribute *attr,
343 		       char *buf)
344 {
345 	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
346 	struct nct7802_data *data = dev_get_drvdata(dev);
347 	int voltage;
348 
349 	voltage = nct7802_read_voltage(data, sattr->nr, sattr->index);
350 	if (voltage < 0)
351 		return voltage;
352 
353 	return sprintf(buf, "%d\n", voltage);
354 }
355 
in_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)356 static ssize_t in_store(struct device *dev, struct device_attribute *attr,
357 			const char *buf, size_t count)
358 {
359 	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
360 	struct nct7802_data *data = dev_get_drvdata(dev);
361 	int index = sattr->index;
362 	int nr = sattr->nr;
363 	unsigned long val;
364 	int err;
365 
366 	err = kstrtoul(buf, 10, &val);
367 	if (err < 0)
368 		return err;
369 
370 	err = nct7802_write_voltage(data, nr, index, val);
371 	return err ? : count;
372 }
373 
in_alarm_show(struct device * dev,struct device_attribute * attr,char * buf)374 static ssize_t in_alarm_show(struct device *dev, struct device_attribute *attr,
375 			     char *buf)
376 {
377 	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
378 	struct nct7802_data *data = dev_get_drvdata(dev);
379 	int volt, min, max, ret;
380 	unsigned int val;
381 
382 	mutex_lock(&data->in_alarm_lock);
383 
384 	/*
385 	 * The SMI Voltage status register is the only register giving a status
386 	 * for voltages. A bit is set for each input crossing a threshold, in
387 	 * both direction, but the "inside" or "outside" limits info is not
388 	 * available. Also this register is cleared on read.
389 	 * Note: this is not explicitly spelled out in the datasheet, but
390 	 * from experiment.
391 	 * To deal with this we use a status cache with one validity bit and
392 	 * one status bit for each input. Validity is cleared at startup and
393 	 * each time the register reports a change, and the status is processed
394 	 * by software based on current input value and limits.
395 	 */
396 	ret = regmap_read(data->regmap, 0x1e, &val); /* SMI Voltage status */
397 	if (ret < 0)
398 		goto abort;
399 
400 	/* invalidate cached status for all inputs crossing a threshold */
401 	data->in_status &= ~((val & 0x0f) << 4);
402 
403 	/* if cached status for requested input is invalid, update it */
404 	if (!(data->in_status & (0x10 << sattr->index))) {
405 		ret = nct7802_read_voltage(data, sattr->nr, 0);
406 		if (ret < 0)
407 			goto abort;
408 		volt = ret;
409 
410 		ret = nct7802_read_voltage(data, sattr->nr, 1);
411 		if (ret < 0)
412 			goto abort;
413 		min = ret;
414 
415 		ret = nct7802_read_voltage(data, sattr->nr, 2);
416 		if (ret < 0)
417 			goto abort;
418 		max = ret;
419 
420 		if (volt < min || volt > max)
421 			data->in_status |= (1 << sattr->index);
422 		else
423 			data->in_status &= ~(1 << sattr->index);
424 
425 		data->in_status |= 0x10 << sattr->index;
426 	}
427 
428 	ret = sprintf(buf, "%u\n", !!(data->in_status & (1 << sattr->index)));
429 abort:
430 	mutex_unlock(&data->in_alarm_lock);
431 	return ret;
432 }
433 
temp_show(struct device * dev,struct device_attribute * attr,char * buf)434 static ssize_t temp_show(struct device *dev, struct device_attribute *attr,
435 			 char *buf)
436 {
437 	struct nct7802_data *data = dev_get_drvdata(dev);
438 	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
439 	int err, temp;
440 
441 	err = nct7802_read_temp(data, sattr->nr, sattr->index, &temp);
442 	if (err < 0)
443 		return err;
444 
445 	return sprintf(buf, "%d\n", temp);
446 }
447 
temp_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)448 static ssize_t temp_store(struct device *dev, struct device_attribute *attr,
449 			  const char *buf, size_t count)
450 {
451 	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
452 	struct nct7802_data *data = dev_get_drvdata(dev);
453 	int nr = sattr->nr;
454 	long val;
455 	int err;
456 
457 	err = kstrtol(buf, 10, &val);
458 	if (err < 0)
459 		return err;
460 
461 	val = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000);
462 
463 	err = regmap_write(data->regmap, nr, val & 0xff);
464 	return err ? : count;
465 }
466 
fan_show(struct device * dev,struct device_attribute * attr,char * buf)467 static ssize_t fan_show(struct device *dev, struct device_attribute *attr,
468 			char *buf)
469 {
470 	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
471 	struct nct7802_data *data = dev_get_drvdata(dev);
472 	int speed;
473 
474 	speed = nct7802_read_fan(data, sattr->index);
475 	if (speed < 0)
476 		return speed;
477 
478 	return sprintf(buf, "%d\n", speed);
479 }
480 
fan_min_show(struct device * dev,struct device_attribute * attr,char * buf)481 static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr,
482 			    char *buf)
483 {
484 	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
485 	struct nct7802_data *data = dev_get_drvdata(dev);
486 	int speed;
487 
488 	speed = nct7802_read_fan_min(data, sattr->nr, sattr->index);
489 	if (speed < 0)
490 		return speed;
491 
492 	return sprintf(buf, "%d\n", speed);
493 }
494 
fan_min_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)495 static ssize_t fan_min_store(struct device *dev,
496 			     struct device_attribute *attr, const char *buf,
497 			     size_t count)
498 {
499 	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
500 	struct nct7802_data *data = dev_get_drvdata(dev);
501 	unsigned long val;
502 	int err;
503 
504 	err = kstrtoul(buf, 10, &val);
505 	if (err < 0)
506 		return err;
507 
508 	err = nct7802_write_fan_min(data, sattr->nr, sattr->index, val);
509 	return err ? : count;
510 }
511 
alarm_show(struct device * dev,struct device_attribute * attr,char * buf)512 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
513 			  char *buf)
514 {
515 	struct nct7802_data *data = dev_get_drvdata(dev);
516 	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
517 	int bit = sattr->index;
518 	unsigned int val;
519 	int ret;
520 
521 	ret = regmap_read(data->regmap, sattr->nr, &val);
522 	if (ret < 0)
523 		return ret;
524 
525 	return sprintf(buf, "%u\n", !!(val & (1 << bit)));
526 }
527 
528 static ssize_t
beep_show(struct device * dev,struct device_attribute * attr,char * buf)529 beep_show(struct device *dev, struct device_attribute *attr, char *buf)
530 {
531 	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
532 	struct nct7802_data *data = dev_get_drvdata(dev);
533 	unsigned int regval;
534 	int err;
535 
536 	err = regmap_read(data->regmap, sattr->nr, &regval);
537 	if (err)
538 		return err;
539 
540 	return sprintf(buf, "%u\n", !!(regval & (1 << sattr->index)));
541 }
542 
543 static ssize_t
beep_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)544 beep_store(struct device *dev, struct device_attribute *attr, const char *buf,
545 	   size_t count)
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 long val;
550 	int err;
551 
552 	err = kstrtoul(buf, 10, &val);
553 	if (err < 0)
554 		return err;
555 	if (val > 1)
556 		return -EINVAL;
557 
558 	err = regmap_update_bits(data->regmap, sattr->nr, 1 << sattr->index,
559 				 val ? 1 << sattr->index : 0);
560 	return err ? : count;
561 }
562 
563 static SENSOR_DEVICE_ATTR_RW(temp1_type, temp_type, 0);
564 static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0x01, REG_TEMP_LSB);
565 static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 0x31, 0);
566 static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0x30, 0);
567 static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 0x3a, 0);
568 
569 static SENSOR_DEVICE_ATTR_RW(temp2_type, temp_type, 1);
570 static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 0x02, REG_TEMP_LSB);
571 static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 0x33, 0);
572 static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 0x32, 0);
573 static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 0x3b, 0);
574 
575 static SENSOR_DEVICE_ATTR_RW(temp3_type, temp_type, 2);
576 static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 0x03, REG_TEMP_LSB);
577 static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 0x35, 0);
578 static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 0x34, 0);
579 static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 0x3c, 0);
580 
581 static SENSOR_DEVICE_ATTR_2_RO(temp4_input, temp, 0x04, 0);
582 static SENSOR_DEVICE_ATTR_2_RW(temp4_min, temp, 0x37, 0);
583 static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 0x36, 0);
584 static SENSOR_DEVICE_ATTR_2_RW(temp4_crit, temp, 0x3d, 0);
585 
586 static SENSOR_DEVICE_ATTR_2_RO(temp5_input, temp, 0x06, REG_TEMP_PECI_LSB);
587 static SENSOR_DEVICE_ATTR_2_RW(temp5_min, temp, 0x39, 0);
588 static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 0x38, 0);
589 static SENSOR_DEVICE_ATTR_2_RW(temp5_crit, temp, 0x3e, 0);
590 
591 static SENSOR_DEVICE_ATTR_2_RO(temp6_input, temp, 0x07, REG_TEMP_PECI_LSB);
592 
593 static SENSOR_DEVICE_ATTR_2_RO(temp1_min_alarm, alarm, 0x18, 0);
594 static SENSOR_DEVICE_ATTR_2_RO(temp2_min_alarm, alarm, 0x18, 1);
595 static SENSOR_DEVICE_ATTR_2_RO(temp3_min_alarm, alarm, 0x18, 2);
596 static SENSOR_DEVICE_ATTR_2_RO(temp4_min_alarm, alarm, 0x18, 3);
597 static SENSOR_DEVICE_ATTR_2_RO(temp5_min_alarm, alarm, 0x18, 4);
598 
599 static SENSOR_DEVICE_ATTR_2_RO(temp1_max_alarm, alarm, 0x19, 0);
600 static SENSOR_DEVICE_ATTR_2_RO(temp2_max_alarm, alarm, 0x19, 1);
601 static SENSOR_DEVICE_ATTR_2_RO(temp3_max_alarm, alarm, 0x19, 2);
602 static SENSOR_DEVICE_ATTR_2_RO(temp4_max_alarm, alarm, 0x19, 3);
603 static SENSOR_DEVICE_ATTR_2_RO(temp5_max_alarm, alarm, 0x19, 4);
604 
605 static SENSOR_DEVICE_ATTR_2_RO(temp1_crit_alarm, alarm, 0x1b, 0);
606 static SENSOR_DEVICE_ATTR_2_RO(temp2_crit_alarm, alarm, 0x1b, 1);
607 static SENSOR_DEVICE_ATTR_2_RO(temp3_crit_alarm, alarm, 0x1b, 2);
608 static SENSOR_DEVICE_ATTR_2_RO(temp4_crit_alarm, alarm, 0x1b, 3);
609 static SENSOR_DEVICE_ATTR_2_RO(temp5_crit_alarm, alarm, 0x1b, 4);
610 
611 static SENSOR_DEVICE_ATTR_2_RO(temp1_fault, alarm, 0x17, 0);
612 static SENSOR_DEVICE_ATTR_2_RO(temp2_fault, alarm, 0x17, 1);
613 static SENSOR_DEVICE_ATTR_2_RO(temp3_fault, alarm, 0x17, 2);
614 
615 static SENSOR_DEVICE_ATTR_2_RW(temp1_beep, beep, 0x5c, 0);
616 static SENSOR_DEVICE_ATTR_2_RW(temp2_beep, beep, 0x5c, 1);
617 static SENSOR_DEVICE_ATTR_2_RW(temp3_beep, beep, 0x5c, 2);
618 static SENSOR_DEVICE_ATTR_2_RW(temp4_beep, beep, 0x5c, 3);
619 static SENSOR_DEVICE_ATTR_2_RW(temp5_beep, beep, 0x5c, 4);
620 static SENSOR_DEVICE_ATTR_2_RW(temp6_beep, beep, 0x5c, 5);
621 
622 static struct attribute *nct7802_temp_attrs[] = {
623 	&sensor_dev_attr_temp1_type.dev_attr.attr,
624 	&sensor_dev_attr_temp1_input.dev_attr.attr,
625 	&sensor_dev_attr_temp1_min.dev_attr.attr,
626 	&sensor_dev_attr_temp1_max.dev_attr.attr,
627 	&sensor_dev_attr_temp1_crit.dev_attr.attr,
628 	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
629 	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
630 	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
631 	&sensor_dev_attr_temp1_fault.dev_attr.attr,
632 	&sensor_dev_attr_temp1_beep.dev_attr.attr,
633 
634 	&sensor_dev_attr_temp2_type.dev_attr.attr,		/* 10 */
635 	&sensor_dev_attr_temp2_input.dev_attr.attr,
636 	&sensor_dev_attr_temp2_min.dev_attr.attr,
637 	&sensor_dev_attr_temp2_max.dev_attr.attr,
638 	&sensor_dev_attr_temp2_crit.dev_attr.attr,
639 	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
640 	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
641 	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
642 	&sensor_dev_attr_temp2_fault.dev_attr.attr,
643 	&sensor_dev_attr_temp2_beep.dev_attr.attr,
644 
645 	&sensor_dev_attr_temp3_type.dev_attr.attr,		/* 20 */
646 	&sensor_dev_attr_temp3_input.dev_attr.attr,
647 	&sensor_dev_attr_temp3_min.dev_attr.attr,
648 	&sensor_dev_attr_temp3_max.dev_attr.attr,
649 	&sensor_dev_attr_temp3_crit.dev_attr.attr,
650 	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
651 	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
652 	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
653 	&sensor_dev_attr_temp3_fault.dev_attr.attr,
654 	&sensor_dev_attr_temp3_beep.dev_attr.attr,
655 
656 	&sensor_dev_attr_temp4_input.dev_attr.attr,		/* 30 */
657 	&sensor_dev_attr_temp4_min.dev_attr.attr,
658 	&sensor_dev_attr_temp4_max.dev_attr.attr,
659 	&sensor_dev_attr_temp4_crit.dev_attr.attr,
660 	&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
661 	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
662 	&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
663 	&sensor_dev_attr_temp4_beep.dev_attr.attr,
664 
665 	&sensor_dev_attr_temp5_input.dev_attr.attr,		/* 38 */
666 	&sensor_dev_attr_temp5_min.dev_attr.attr,
667 	&sensor_dev_attr_temp5_max.dev_attr.attr,
668 	&sensor_dev_attr_temp5_crit.dev_attr.attr,
669 	&sensor_dev_attr_temp5_min_alarm.dev_attr.attr,
670 	&sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
671 	&sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
672 	&sensor_dev_attr_temp5_beep.dev_attr.attr,
673 
674 	&sensor_dev_attr_temp6_input.dev_attr.attr,		/* 46 */
675 	&sensor_dev_attr_temp6_beep.dev_attr.attr,
676 
677 	NULL
678 };
679 
nct7802_temp_is_visible(struct kobject * kobj,struct attribute * attr,int index)680 static umode_t nct7802_temp_is_visible(struct kobject *kobj,
681 				       struct attribute *attr, int index)
682 {
683 	struct device *dev = kobj_to_dev(kobj);
684 	struct nct7802_data *data = dev_get_drvdata(dev);
685 	unsigned int reg;
686 	int err;
687 
688 	err = regmap_read(data->regmap, REG_MODE, &reg);
689 	if (err < 0)
690 		return 0;
691 
692 	if (index < 10 &&
693 	    (reg & 03) != 0x01 && (reg & 0x03) != 0x02)		/* RD1 */
694 		return 0;
695 
696 	if (index >= 10 && index < 20 &&
697 	    (reg & 0x0c) != 0x04 && (reg & 0x0c) != 0x08)	/* RD2 */
698 		return 0;
699 	if (index >= 20 && index < 30 && (reg & 0x30) != 0x20)	/* RD3 */
700 		return 0;
701 
702 	if (index >= 30 && index < 38)				/* local */
703 		return attr->mode;
704 
705 	err = regmap_read(data->regmap, REG_PECI_ENABLE, &reg);
706 	if (err < 0)
707 		return 0;
708 
709 	if (index >= 38 && index < 46 && !(reg & 0x01))		/* PECI 0 */
710 		return 0;
711 
712 	if (index >= 46 && !(reg & 0x02))			/* PECI 1 */
713 		return 0;
714 
715 	return attr->mode;
716 }
717 
718 static const struct attribute_group nct7802_temp_group = {
719 	.attrs = nct7802_temp_attrs,
720 	.is_visible = nct7802_temp_is_visible,
721 };
722 
723 static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, 0, 0);
724 static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, 0, 1);
725 static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, 0, 2);
726 static SENSOR_DEVICE_ATTR_2_RO(in0_alarm, in_alarm, 0, 3);
727 static SENSOR_DEVICE_ATTR_2_RW(in0_beep, beep, 0x5a, 3);
728 
729 static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, 1, 0);
730 
731 static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, 2, 0);
732 static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, 2, 1);
733 static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, 2, 2);
734 static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, in_alarm, 2, 0);
735 static SENSOR_DEVICE_ATTR_2_RW(in2_beep, beep, 0x5a, 0);
736 
737 static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, 3, 0);
738 static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, 3, 1);
739 static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, 3, 2);
740 static SENSOR_DEVICE_ATTR_2_RO(in3_alarm, in_alarm, 3, 1);
741 static SENSOR_DEVICE_ATTR_2_RW(in3_beep, beep, 0x5a, 1);
742 
743 static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, 4, 0);
744 static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, 4, 1);
745 static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, 4, 2);
746 static SENSOR_DEVICE_ATTR_2_RO(in4_alarm, in_alarm, 4, 2);
747 static SENSOR_DEVICE_ATTR_2_RW(in4_beep, beep, 0x5a, 2);
748 
749 static struct attribute *nct7802_in_attrs[] = {
750 	&sensor_dev_attr_in0_input.dev_attr.attr,
751 	&sensor_dev_attr_in0_min.dev_attr.attr,
752 	&sensor_dev_attr_in0_max.dev_attr.attr,
753 	&sensor_dev_attr_in0_alarm.dev_attr.attr,
754 	&sensor_dev_attr_in0_beep.dev_attr.attr,
755 
756 	&sensor_dev_attr_in1_input.dev_attr.attr,	/* 5 */
757 
758 	&sensor_dev_attr_in2_input.dev_attr.attr,	/* 6 */
759 	&sensor_dev_attr_in2_min.dev_attr.attr,
760 	&sensor_dev_attr_in2_max.dev_attr.attr,
761 	&sensor_dev_attr_in2_alarm.dev_attr.attr,
762 	&sensor_dev_attr_in2_beep.dev_attr.attr,
763 
764 	&sensor_dev_attr_in3_input.dev_attr.attr,	/* 11 */
765 	&sensor_dev_attr_in3_min.dev_attr.attr,
766 	&sensor_dev_attr_in3_max.dev_attr.attr,
767 	&sensor_dev_attr_in3_alarm.dev_attr.attr,
768 	&sensor_dev_attr_in3_beep.dev_attr.attr,
769 
770 	&sensor_dev_attr_in4_input.dev_attr.attr,	/* 16 */
771 	&sensor_dev_attr_in4_min.dev_attr.attr,
772 	&sensor_dev_attr_in4_max.dev_attr.attr,
773 	&sensor_dev_attr_in4_alarm.dev_attr.attr,
774 	&sensor_dev_attr_in4_beep.dev_attr.attr,
775 
776 	NULL,
777 };
778 
nct7802_in_is_visible(struct kobject * kobj,struct attribute * attr,int index)779 static umode_t nct7802_in_is_visible(struct kobject *kobj,
780 				     struct attribute *attr, int index)
781 {
782 	struct device *dev = kobj_to_dev(kobj);
783 	struct nct7802_data *data = dev_get_drvdata(dev);
784 	unsigned int reg;
785 	int err;
786 
787 	if (index < 6)						/* VCC, VCORE */
788 		return attr->mode;
789 
790 	err = regmap_read(data->regmap, REG_MODE, &reg);
791 	if (err < 0)
792 		return 0;
793 
794 	if (index >= 6 && index < 11 && (reg & 0x03) != 0x03)	/* VSEN1 */
795 		return 0;
796 	if (index >= 11 && index < 16 && (reg & 0x0c) != 0x0c)	/* VSEN2 */
797 		return 0;
798 	if (index >= 16 && (reg & 0x30) != 0x30)		/* VSEN3 */
799 		return 0;
800 
801 	return attr->mode;
802 }
803 
804 static const struct attribute_group nct7802_in_group = {
805 	.attrs = nct7802_in_attrs,
806 	.is_visible = nct7802_in_is_visible,
807 };
808 
809 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0x10);
810 static SENSOR_DEVICE_ATTR_2_RW(fan1_min, fan_min, 0x49, 0x4c);
811 static SENSOR_DEVICE_ATTR_2_RO(fan1_alarm, alarm, 0x1a, 0);
812 static SENSOR_DEVICE_ATTR_2_RW(fan1_beep, beep, 0x5b, 0);
813 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 0x11);
814 static SENSOR_DEVICE_ATTR_2_RW(fan2_min, fan_min, 0x4a, 0x4d);
815 static SENSOR_DEVICE_ATTR_2_RO(fan2_alarm, alarm, 0x1a, 1);
816 static SENSOR_DEVICE_ATTR_2_RW(fan2_beep, beep, 0x5b, 1);
817 static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 0x12);
818 static SENSOR_DEVICE_ATTR_2_RW(fan3_min, fan_min, 0x4b, 0x4e);
819 static SENSOR_DEVICE_ATTR_2_RO(fan3_alarm, alarm, 0x1a, 2);
820 static SENSOR_DEVICE_ATTR_2_RW(fan3_beep, beep, 0x5b, 2);
821 
822 /* 7.2.89 Fan Control Output Type */
823 static SENSOR_DEVICE_ATTR_RO(pwm1_mode, pwm_mode, 0);
824 static SENSOR_DEVICE_ATTR_RO(pwm2_mode, pwm_mode, 1);
825 static SENSOR_DEVICE_ATTR_RO(pwm3_mode, pwm_mode, 2);
826 
827 /* 7.2.91... Fan Control Output Value */
828 static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, REG_PWM(0));
829 static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, REG_PWM(1));
830 static SENSOR_DEVICE_ATTR_RW(pwm3, pwm, REG_PWM(2));
831 
832 /* 7.2.95... Temperature to Fan mapping Relationships Register */
833 static SENSOR_DEVICE_ATTR_RW(pwm1_enable, pwm_enable, 0);
834 static SENSOR_DEVICE_ATTR_RW(pwm2_enable, pwm_enable, 1);
835 static SENSOR_DEVICE_ATTR_RW(pwm3_enable, pwm_enable, 2);
836 
837 static struct attribute *nct7802_fan_attrs[] = {
838 	&sensor_dev_attr_fan1_input.dev_attr.attr,
839 	&sensor_dev_attr_fan1_min.dev_attr.attr,
840 	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
841 	&sensor_dev_attr_fan1_beep.dev_attr.attr,
842 	&sensor_dev_attr_fan2_input.dev_attr.attr,
843 	&sensor_dev_attr_fan2_min.dev_attr.attr,
844 	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
845 	&sensor_dev_attr_fan2_beep.dev_attr.attr,
846 	&sensor_dev_attr_fan3_input.dev_attr.attr,
847 	&sensor_dev_attr_fan3_min.dev_attr.attr,
848 	&sensor_dev_attr_fan3_alarm.dev_attr.attr,
849 	&sensor_dev_attr_fan3_beep.dev_attr.attr,
850 
851 	NULL
852 };
853 
nct7802_fan_is_visible(struct kobject * kobj,struct attribute * attr,int index)854 static umode_t nct7802_fan_is_visible(struct kobject *kobj,
855 				      struct attribute *attr, int index)
856 {
857 	struct device *dev = kobj_to_dev(kobj);
858 	struct nct7802_data *data = dev_get_drvdata(dev);
859 	int fan = index / 4;	/* 4 attributes per fan */
860 	unsigned int reg;
861 	int err;
862 
863 	err = regmap_read(data->regmap, REG_FAN_ENABLE, &reg);
864 	if (err < 0 || !(reg & (1 << fan)))
865 		return 0;
866 
867 	return attr->mode;
868 }
869 
870 static const struct attribute_group nct7802_fan_group = {
871 	.attrs = nct7802_fan_attrs,
872 	.is_visible = nct7802_fan_is_visible,
873 };
874 
875 static struct attribute *nct7802_pwm_attrs[] = {
876 	&sensor_dev_attr_pwm1_enable.dev_attr.attr,
877 	&sensor_dev_attr_pwm1_mode.dev_attr.attr,
878 	&sensor_dev_attr_pwm1.dev_attr.attr,
879 	&sensor_dev_attr_pwm2_enable.dev_attr.attr,
880 	&sensor_dev_attr_pwm2_mode.dev_attr.attr,
881 	&sensor_dev_attr_pwm2.dev_attr.attr,
882 	&sensor_dev_attr_pwm3_enable.dev_attr.attr,
883 	&sensor_dev_attr_pwm3_mode.dev_attr.attr,
884 	&sensor_dev_attr_pwm3.dev_attr.attr,
885 	NULL
886 };
887 
888 static const struct attribute_group nct7802_pwm_group = {
889 	.attrs = nct7802_pwm_attrs,
890 };
891 
892 /* 7.2.115... 0x80-0x83, 0x84 Temperature (X-axis) transition */
893 static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point1_temp, temp, 0x80, 0);
894 static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point2_temp, temp, 0x81, 0);
895 static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point3_temp, temp, 0x82, 0);
896 static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point4_temp, temp, 0x83, 0);
897 static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point5_temp, temp, 0x84, 0);
898 
899 /* 7.2.120... 0x85-0x88 PWM (Y-axis) transition */
900 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point1_pwm, pwm, 0x85);
901 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_pwm, pwm, 0x86);
902 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point3_pwm, pwm, 0x87);
903 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point4_pwm, pwm, 0x88);
904 static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point5_pwm, pwm, 0);
905 
906 /* 7.2.124 Table 2 X-axis Transition Point 1 Register */
907 static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point1_temp, temp, 0x90, 0);
908 static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point2_temp, temp, 0x91, 0);
909 static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point3_temp, temp, 0x92, 0);
910 static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point4_temp, temp, 0x93, 0);
911 static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point5_temp, temp, 0x94, 0);
912 
913 /* 7.2.129 Table 2 Y-axis Transition Point 1 Register */
914 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point1_pwm, pwm, 0x95);
915 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point2_pwm, pwm, 0x96);
916 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point3_pwm, pwm, 0x97);
917 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point4_pwm, pwm, 0x98);
918 static SENSOR_DEVICE_ATTR_RO(pwm2_auto_point5_pwm, pwm, 0);
919 
920 /* 7.2.133 Table 3 X-axis Transition Point 1 Register */
921 static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point1_temp, temp, 0xA0, 0);
922 static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point2_temp, temp, 0xA1, 0);
923 static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point3_temp, temp, 0xA2, 0);
924 static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point4_temp, temp, 0xA3, 0);
925 static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point5_temp, temp, 0xA4, 0);
926 
927 /* 7.2.138 Table 3 Y-axis Transition Point 1 Register */
928 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point1_pwm, pwm, 0xA5);
929 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point2_pwm, pwm, 0xA6);
930 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point3_pwm, pwm, 0xA7);
931 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point4_pwm, pwm, 0xA8);
932 static SENSOR_DEVICE_ATTR_RO(pwm3_auto_point5_pwm, pwm, 0);
933 
934 static struct attribute *nct7802_auto_point_attrs[] = {
935 	&sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
936 	&sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
937 	&sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr,
938 	&sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr,
939 	&sensor_dev_attr_pwm1_auto_point5_temp.dev_attr.attr,
940 
941 	&sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
942 	&sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
943 	&sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
944 	&sensor_dev_attr_pwm1_auto_point4_pwm.dev_attr.attr,
945 	&sensor_dev_attr_pwm1_auto_point5_pwm.dev_attr.attr,
946 
947 	&sensor_dev_attr_pwm2_auto_point1_temp.dev_attr.attr,
948 	&sensor_dev_attr_pwm2_auto_point2_temp.dev_attr.attr,
949 	&sensor_dev_attr_pwm2_auto_point3_temp.dev_attr.attr,
950 	&sensor_dev_attr_pwm2_auto_point4_temp.dev_attr.attr,
951 	&sensor_dev_attr_pwm2_auto_point5_temp.dev_attr.attr,
952 
953 	&sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr,
954 	&sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr,
955 	&sensor_dev_attr_pwm2_auto_point3_pwm.dev_attr.attr,
956 	&sensor_dev_attr_pwm2_auto_point4_pwm.dev_attr.attr,
957 	&sensor_dev_attr_pwm2_auto_point5_pwm.dev_attr.attr,
958 
959 	&sensor_dev_attr_pwm3_auto_point1_temp.dev_attr.attr,
960 	&sensor_dev_attr_pwm3_auto_point2_temp.dev_attr.attr,
961 	&sensor_dev_attr_pwm3_auto_point3_temp.dev_attr.attr,
962 	&sensor_dev_attr_pwm3_auto_point4_temp.dev_attr.attr,
963 	&sensor_dev_attr_pwm3_auto_point5_temp.dev_attr.attr,
964 
965 	&sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr,
966 	&sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr,
967 	&sensor_dev_attr_pwm3_auto_point3_pwm.dev_attr.attr,
968 	&sensor_dev_attr_pwm3_auto_point4_pwm.dev_attr.attr,
969 	&sensor_dev_attr_pwm3_auto_point5_pwm.dev_attr.attr,
970 
971 	NULL
972 };
973 
974 static const struct attribute_group nct7802_auto_point_group = {
975 	.attrs = nct7802_auto_point_attrs,
976 };
977 
978 static const struct attribute_group *nct7802_groups[] = {
979 	&nct7802_temp_group,
980 	&nct7802_in_group,
981 	&nct7802_fan_group,
982 	&nct7802_pwm_group,
983 	&nct7802_auto_point_group,
984 	NULL
985 };
986 
nct7802_detect(struct i2c_client * client,struct i2c_board_info * info)987 static int nct7802_detect(struct i2c_client *client,
988 			  struct i2c_board_info *info)
989 {
990 	int reg;
991 
992 	/*
993 	 * Chip identification registers are only available in bank 0,
994 	 * so only attempt chip detection if bank 0 is selected
995 	 */
996 	reg = i2c_smbus_read_byte_data(client, REG_BANK);
997 	if (reg != 0x00)
998 		return -ENODEV;
999 
1000 	reg = i2c_smbus_read_byte_data(client, REG_VENDOR_ID);
1001 	if (reg != 0x50)
1002 		return -ENODEV;
1003 
1004 	reg = i2c_smbus_read_byte_data(client, REG_CHIP_ID);
1005 	if (reg != 0xc3)
1006 		return -ENODEV;
1007 
1008 	reg = i2c_smbus_read_byte_data(client, REG_VERSION_ID);
1009 	if (reg < 0 || (reg & 0xf0) != 0x20)
1010 		return -ENODEV;
1011 
1012 	/* Also validate lower bits of voltage and temperature registers */
1013 	reg = i2c_smbus_read_byte_data(client, REG_TEMP_LSB);
1014 	if (reg < 0 || (reg & 0x1f))
1015 		return -ENODEV;
1016 
1017 	reg = i2c_smbus_read_byte_data(client, REG_TEMP_PECI_LSB);
1018 	if (reg < 0 || (reg & 0x3f))
1019 		return -ENODEV;
1020 
1021 	reg = i2c_smbus_read_byte_data(client, REG_VOLTAGE_LOW);
1022 	if (reg < 0 || (reg & 0x3f))
1023 		return -ENODEV;
1024 
1025 	strscpy(info->type, "nct7802", I2C_NAME_SIZE);
1026 	return 0;
1027 }
1028 
nct7802_regmap_is_volatile(struct device * dev,unsigned int reg)1029 static bool nct7802_regmap_is_volatile(struct device *dev, unsigned int reg)
1030 {
1031 	return (reg != REG_BANK && reg <= 0x20) ||
1032 		(reg >= REG_PWM(0) && reg <= REG_PWM(2));
1033 }
1034 
1035 static const struct regmap_config nct7802_regmap_config = {
1036 	.reg_bits = 8,
1037 	.val_bits = 8,
1038 	.cache_type = REGCACHE_MAPLE,
1039 	.volatile_reg = nct7802_regmap_is_volatile,
1040 };
1041 
nct7802_get_channel_config(struct device * dev,struct device_node * node,u8 * mode_mask,u8 * mode_val)1042 static int nct7802_get_channel_config(struct device *dev,
1043 				      struct device_node *node, u8 *mode_mask,
1044 				      u8 *mode_val)
1045 {
1046 	u32 reg;
1047 	const char *type_str, *md_str;
1048 	u8 md;
1049 
1050 	if (!node->name || of_node_cmp(node->name, "channel"))
1051 		return 0;
1052 
1053 	if (of_property_read_u32(node, "reg", &reg)) {
1054 		dev_err(dev, "Could not read reg value for '%s'\n",
1055 			node->full_name);
1056 		return -EINVAL;
1057 	}
1058 
1059 	if (reg > 3) {
1060 		dev_err(dev, "Invalid reg (%u) in '%s'\n", reg,
1061 			node->full_name);
1062 		return -EINVAL;
1063 	}
1064 
1065 	if (reg == 0) {
1066 		if (!of_device_is_available(node))
1067 			*mode_val &= ~MODE_LTD_EN;
1068 		else
1069 			*mode_val |= MODE_LTD_EN;
1070 		*mode_mask |= MODE_LTD_EN;
1071 		return 0;
1072 	}
1073 
1074 	/* At this point we have reg >= 1 && reg <= 3 */
1075 
1076 	if (!of_device_is_available(node)) {
1077 		*mode_val &= ~(MODE_RTD_MASK << MODE_BIT_OFFSET_RTD(reg - 1));
1078 		*mode_mask |= MODE_RTD_MASK << MODE_BIT_OFFSET_RTD(reg - 1);
1079 		return 0;
1080 	}
1081 
1082 	if (of_property_read_string(node, "sensor-type", &type_str)) {
1083 		dev_err(dev, "No type for '%s'\n", node->full_name);
1084 		return -EINVAL;
1085 	}
1086 
1087 	if (!strcmp(type_str, "voltage")) {
1088 		*mode_val |= (RTD_MODE_VOLTAGE & MODE_RTD_MASK)
1089 			     << MODE_BIT_OFFSET_RTD(reg - 1);
1090 		*mode_mask |= MODE_RTD_MASK << MODE_BIT_OFFSET_RTD(reg - 1);
1091 		return 0;
1092 	}
1093 
1094 	if (strcmp(type_str, "temperature")) {
1095 		dev_err(dev, "Invalid type '%s' for '%s'\n", type_str,
1096 			node->full_name);
1097 		return -EINVAL;
1098 	}
1099 
1100 	if (reg == 3) {
1101 		/* RTD3 only supports thermistor mode */
1102 		md = RTD_MODE_THERMISTOR;
1103 	} else {
1104 		if (of_property_read_string(node, "temperature-mode",
1105 					    &md_str)) {
1106 			dev_err(dev, "No mode for '%s'\n", node->full_name);
1107 			return -EINVAL;
1108 		}
1109 
1110 		if (!strcmp(md_str, "thermal-diode"))
1111 			md = RTD_MODE_CURRENT;
1112 		else if (!strcmp(md_str, "thermistor"))
1113 			md = RTD_MODE_THERMISTOR;
1114 		else {
1115 			dev_err(dev, "Invalid mode '%s' for '%s'\n", md_str,
1116 				node->full_name);
1117 			return -EINVAL;
1118 		}
1119 	}
1120 
1121 	*mode_val |= (md & MODE_RTD_MASK) << MODE_BIT_OFFSET_RTD(reg - 1);
1122 	*mode_mask |= MODE_RTD_MASK << MODE_BIT_OFFSET_RTD(reg - 1);
1123 
1124 	return 0;
1125 }
1126 
nct7802_configure_channels(struct device * dev,struct nct7802_data * data)1127 static int nct7802_configure_channels(struct device *dev,
1128 				      struct nct7802_data *data)
1129 {
1130 	/* Enable local temperature sensor by default */
1131 	u8 mode_mask = MODE_LTD_EN, mode_val = MODE_LTD_EN;
1132 	int err;
1133 
1134 	if (dev->of_node) {
1135 		for_each_child_of_node_scoped(dev->of_node, node) {
1136 			err = nct7802_get_channel_config(dev, node, &mode_mask,
1137 							 &mode_val);
1138 			if (err)
1139 				return err;
1140 		}
1141 	}
1142 
1143 	return regmap_update_bits(data->regmap, REG_MODE, mode_mask, mode_val);
1144 }
1145 
nct7802_init_chip(struct device * dev,struct nct7802_data * data)1146 static int nct7802_init_chip(struct device *dev, struct nct7802_data *data)
1147 {
1148 	int err;
1149 
1150 	/* Enable ADC */
1151 	err = regmap_update_bits(data->regmap, REG_START, 0x01, 0x01);
1152 	if (err)
1153 		return err;
1154 
1155 	err = nct7802_configure_channels(dev, data);
1156 	if (err)
1157 		return err;
1158 
1159 	/* Enable Vcore and VCC voltage monitoring */
1160 	return regmap_update_bits(data->regmap, REG_VMON_ENABLE, 0x03, 0x03);
1161 }
1162 
nct7802_probe(struct i2c_client * client)1163 static int nct7802_probe(struct i2c_client *client)
1164 {
1165 	struct device *dev = &client->dev;
1166 	struct nct7802_data *data;
1167 	struct device *hwmon_dev;
1168 	int ret;
1169 
1170 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
1171 	if (data == NULL)
1172 		return -ENOMEM;
1173 
1174 	data->regmap = devm_regmap_init_i2c(client, &nct7802_regmap_config);
1175 	if (IS_ERR(data->regmap))
1176 		return PTR_ERR(data->regmap);
1177 
1178 	mutex_init(&data->access_lock);
1179 	mutex_init(&data->in_alarm_lock);
1180 
1181 	ret = nct7802_init_chip(dev, data);
1182 	if (ret < 0)
1183 		return ret;
1184 
1185 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
1186 							   data,
1187 							   nct7802_groups);
1188 	return PTR_ERR_OR_ZERO(hwmon_dev);
1189 }
1190 
1191 static const unsigned short nct7802_address_list[] = {
1192 	0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END
1193 };
1194 
1195 static const struct i2c_device_id nct7802_idtable[] = {
1196 	{ "nct7802" },
1197 	{ }
1198 };
1199 MODULE_DEVICE_TABLE(i2c, nct7802_idtable);
1200 
1201 static struct i2c_driver nct7802_driver = {
1202 	.class = I2C_CLASS_HWMON,
1203 	.driver = {
1204 		.name = DRVNAME,
1205 	},
1206 	.detect = nct7802_detect,
1207 	.probe = nct7802_probe,
1208 	.id_table = nct7802_idtable,
1209 	.address_list = nct7802_address_list,
1210 };
1211 
1212 module_i2c_driver(nct7802_driver);
1213 
1214 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
1215 MODULE_DESCRIPTION("NCT7802Y Hardware Monitoring Driver");
1216 MODULE_LICENSE("GPL v2");
1217