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, ®val);
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), ®);
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, ®val);
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, ®);
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, ®);
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, ®);
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, ®);
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", ®)) {
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