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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * nct7904.c - driver for Nuvoton NCT7904D.
4 *
5 * Copyright (c) 2015 Kontron
6 * Author: Vadim V. Vlasov <vvlasov@dev.rtsoft.ru>
7 *
8 * Copyright (c) 2019 Advantech
9 * Author: Amy.Shih <amy.shih@advantech.com.tw>
10 *
11 * Copyright (c) 2020 Advantech
12 * Author: Yuechao Zhao <yuechao.zhao@advantech.com.cn>
13 *
14 * Supports the following chips:
15 *
16 * Chip #vin #fan #pwm #temp #dts chip ID
17 * nct7904d 20 12 4 5 8 0xc5
18 */
19
20#include <linux/module.h>
21#include <linux/device.h>
22#include <linux/init.h>
23#include <linux/i2c.h>
24#include <linux/mutex.h>
25#include <linux/hwmon.h>
26#include <linux/watchdog.h>
27
28#define VENDOR_ID_REG 0x7A /* Any bank */
29#define NUVOTON_ID 0x50
30#define CHIP_ID_REG 0x7B /* Any bank */
31#define NCT7904_ID 0xC5
32#define DEVICE_ID_REG 0x7C /* Any bank */
33
34#define BANK_SEL_REG 0xFF
35#define BANK_0 0x00
36#define BANK_1 0x01
37#define BANK_2 0x02
38#define BANK_3 0x03
39#define BANK_4 0x04
40#define BANK_MAX 0x04
41
42#define FANIN_MAX 12 /* Counted from 1 */
43#define VSEN_MAX 21 /* VSEN1..14, 3VDD, VBAT, V3VSB,
44 LTD (not a voltage), VSEN17..19 */
45#define FANCTL_MAX 4 /* Counted from 1 */
46#define TCPU_MAX 8 /* Counted from 1 */
47#define TEMP_MAX 4 /* Counted from 1 */
48#define SMI_STS_MAX 10 /* Counted from 1 */
49
50#define VT_ADC_CTRL0_REG 0x20 /* Bank 0 */
51#define VT_ADC_CTRL1_REG 0x21 /* Bank 0 */
52#define VT_ADC_CTRL2_REG 0x22 /* Bank 0 */
53#define FANIN_CTRL0_REG 0x24
54#define FANIN_CTRL1_REG 0x25
55#define DTS_T_CTRL0_REG 0x26
56#define DTS_T_CTRL1_REG 0x27
57#define VT_ADC_MD_REG 0x2E
58
59#define VSEN1_HV_LL_REG 0x02 /* Bank 1; 2 regs (HV/LV) per sensor */
60#define VSEN1_LV_LL_REG 0x03 /* Bank 1; 2 regs (HV/LV) per sensor */
61#define VSEN1_HV_HL_REG 0x00 /* Bank 1; 2 regs (HV/LV) per sensor */
62#define VSEN1_LV_HL_REG 0x01 /* Bank 1; 2 regs (HV/LV) per sensor */
63#define SMI_STS1_REG 0xC1 /* Bank 0; SMI Status Register */
64#define SMI_STS3_REG 0xC3 /* Bank 0; SMI Status Register */
65#define SMI_STS5_REG 0xC5 /* Bank 0; SMI Status Register */
66#define SMI_STS7_REG 0xC7 /* Bank 0; SMI Status Register */
67#define SMI_STS8_REG 0xC8 /* Bank 0; SMI Status Register */
68
69#define VSEN1_HV_REG 0x40 /* Bank 0; 2 regs (HV/LV) per sensor */
70#define TEMP_CH1_HV_REG 0x42 /* Bank 0; same as VSEN2_HV */
71#define LTD_HV_REG 0x62 /* Bank 0; 2 regs in VSEN range */
72#define LTD_HV_HL_REG 0x44 /* Bank 1; 1 reg for LTD */
73#define LTD_LV_HL_REG 0x45 /* Bank 1; 1 reg for LTD */
74#define LTD_HV_LL_REG 0x46 /* Bank 1; 1 reg for LTD */
75#define LTD_LV_LL_REG 0x47 /* Bank 1; 1 reg for LTD */
76#define TEMP_CH1_CH_REG 0x05 /* Bank 1; 1 reg for LTD */
77#define TEMP_CH1_W_REG 0x06 /* Bank 1; 1 reg for LTD */
78#define TEMP_CH1_WH_REG 0x07 /* Bank 1; 1 reg for LTD */
79#define TEMP_CH1_C_REG 0x04 /* Bank 1; 1 reg per sensor */
80#define DTS_T_CPU1_C_REG 0x90 /* Bank 1; 1 reg per sensor */
81#define DTS_T_CPU1_CH_REG 0x91 /* Bank 1; 1 reg per sensor */
82#define DTS_T_CPU1_W_REG 0x92 /* Bank 1; 1 reg per sensor */
83#define DTS_T_CPU1_WH_REG 0x93 /* Bank 1; 1 reg per sensor */
84#define FANIN1_HV_REG 0x80 /* Bank 0; 2 regs (HV/LV) per sensor */
85#define FANIN1_HV_HL_REG 0x60 /* Bank 1; 2 regs (HV/LV) per sensor */
86#define FANIN1_LV_HL_REG 0x61 /* Bank 1; 2 regs (HV/LV) per sensor */
87#define T_CPU1_HV_REG 0xA0 /* Bank 0; 2 regs (HV/LV) per sensor */
88
89#define PRTS_REG 0x03 /* Bank 2 */
90#define PFE_REG 0x00 /* Bank 2; PECI Function Enable */
91#define TSI_CTRL_REG 0x50 /* Bank 2; TSI Control Register */
92#define FANCTL1_FMR_REG 0x00 /* Bank 3; 1 reg per channel */
93#define FANCTL1_OUT_REG 0x10 /* Bank 3; 1 reg per channel */
94
95#define WDT_LOCK_REG 0xE0 /* W/O Lock Watchdog Register */
96#define WDT_EN_REG 0xE1 /* R/O Watchdog Enable Register */
97#define WDT_STS_REG 0xE2 /* R/O Watchdog Status Register */
98#define WDT_TIMER_REG 0xE3 /* R/W Watchdog Timer Register */
99#define WDT_SOFT_EN 0x55 /* Enable soft watchdog timer */
100#define WDT_SOFT_DIS 0xAA /* Disable soft watchdog timer */
101
102#define VOLT_MONITOR_MODE 0x0
103#define THERMAL_DIODE_MODE 0x1
104#define THERMISTOR_MODE 0x3
105
106#define ENABLE_TSI BIT(1)
107
108#define WATCHDOG_TIMEOUT 1 /* 1 minute default timeout */
109
110/*The timeout range is 1-255 minutes*/
111#define MIN_TIMEOUT (1 * 60)
112#define MAX_TIMEOUT (255 * 60)
113
114static int timeout;
115module_param(timeout, int, 0);
116MODULE_PARM_DESC(timeout, "Watchdog timeout in minutes. 1 <= timeout <= 255, default="
117 __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
118
119static bool nowayout = WATCHDOG_NOWAYOUT;
120module_param(nowayout, bool, 0);
121MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
122 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
123
124static const unsigned short normal_i2c[] = {
125 0x2d, 0x2e, I2C_CLIENT_END
126};
127
128struct nct7904_data {
129 struct i2c_client *client;
130 struct watchdog_device wdt;
131 struct mutex bank_lock;
132 int bank_sel;
133 u32 fanin_mask;
134 u32 vsen_mask;
135 u32 tcpu_mask;
136 u8 fan_mode[FANCTL_MAX];
137 u8 enable_dts;
138 u8 has_dts;
139 u8 temp_mode; /* 0: TR mode, 1: TD mode */
140 u8 fan_alarm[2];
141 u8 vsen_alarm[3];
142};
143
144/* Access functions */
145static int nct7904_bank_lock(struct nct7904_data *data, unsigned int bank)
146{
147 int ret;
148
149 mutex_lock(&data->bank_lock);
150 if (data->bank_sel == bank)
151 return 0;
152 ret = i2c_smbus_write_byte_data(data->client, BANK_SEL_REG, bank);
153 if (ret == 0)
154 data->bank_sel = bank;
155 else
156 data->bank_sel = -1;
157 return ret;
158}
159
160static inline void nct7904_bank_release(struct nct7904_data *data)
161{
162 mutex_unlock(&data->bank_lock);
163}
164
165/* Read 1-byte register. Returns unsigned reg or -ERRNO on error. */
166static int nct7904_read_reg(struct nct7904_data *data,
167 unsigned int bank, unsigned int reg)
168{
169 struct i2c_client *client = data->client;
170 int ret;
171
172 ret = nct7904_bank_lock(data, bank);
173 if (ret == 0)
174 ret = i2c_smbus_read_byte_data(client, reg);
175
176 nct7904_bank_release(data);
177 return ret;
178}
179
180/*
181 * Read 2-byte register. Returns register in big-endian format or
182 * -ERRNO on error.
183 */
184static int nct7904_read_reg16(struct nct7904_data *data,
185 unsigned int bank, unsigned int reg)
186{
187 struct i2c_client *client = data->client;
188 int ret, hi;
189
190 ret = nct7904_bank_lock(data, bank);
191 if (ret == 0) {
192 ret = i2c_smbus_read_byte_data(client, reg);
193 if (ret >= 0) {
194 hi = ret;
195 ret = i2c_smbus_read_byte_data(client, reg + 1);
196 if (ret >= 0)
197 ret |= hi << 8;
198 }
199 }
200
201 nct7904_bank_release(data);
202 return ret;
203}
204
205/* Write 1-byte register. Returns 0 or -ERRNO on error. */
206static int nct7904_write_reg(struct nct7904_data *data,
207 unsigned int bank, unsigned int reg, u8 val)
208{
209 struct i2c_client *client = data->client;
210 int ret;
211
212 ret = nct7904_bank_lock(data, bank);
213 if (ret == 0)
214 ret = i2c_smbus_write_byte_data(client, reg, val);
215
216 nct7904_bank_release(data);
217 return ret;
218}
219
220static int nct7904_read_fan(struct device *dev, u32 attr, int channel,
221 long *val)
222{
223 struct nct7904_data *data = dev_get_drvdata(dev);
224 unsigned int cnt, rpm;
225 int ret;
226
227 switch (attr) {
228 case hwmon_fan_input:
229 ret = nct7904_read_reg16(data, BANK_0,
230 FANIN1_HV_REG + channel * 2);
231 if (ret < 0)
232 return ret;
233 cnt = ((ret & 0xff00) >> 3) | (ret & 0x1f);
234 if (cnt == 0 || cnt == 0x1fff)
235 rpm = 0;
236 else
237 rpm = 1350000 / cnt;
238 *val = rpm;
239 return 0;
240 case hwmon_fan_min:
241 ret = nct7904_read_reg16(data, BANK_1,
242 FANIN1_HV_HL_REG + channel * 2);
243 if (ret < 0)
244 return ret;
245 cnt = ((ret & 0xff00) >> 3) | (ret & 0x1f);
246 if (cnt == 0 || cnt == 0x1fff)
247 rpm = 0;
248 else
249 rpm = 1350000 / cnt;
250 *val = rpm;
251 return 0;
252 case hwmon_fan_alarm:
253 ret = nct7904_read_reg(data, BANK_0,
254 SMI_STS5_REG + (channel >> 3));
255 if (ret < 0)
256 return ret;
257 if (!data->fan_alarm[channel >> 3])
258 data->fan_alarm[channel >> 3] = ret & 0xff;
259 else
260 /* If there is new alarm showing up */
261 data->fan_alarm[channel >> 3] |= (ret & 0xff);
262 *val = (data->fan_alarm[channel >> 3] >> (channel & 0x07)) & 1;
263 /* Needs to clean the alarm if alarm existing */
264 if (*val)
265 data->fan_alarm[channel >> 3] ^= 1 << (channel & 0x07);
266 return 0;
267 default:
268 return -EOPNOTSUPP;
269 }
270}
271
272static umode_t nct7904_fan_is_visible(const void *_data, u32 attr, int channel)
273{
274 const struct nct7904_data *data = _data;
275
276 switch (attr) {
277 case hwmon_fan_input:
278 case hwmon_fan_alarm:
279 if (data->fanin_mask & (1 << channel))
280 return 0444;
281 break;
282 case hwmon_fan_min:
283 if (data->fanin_mask & (1 << channel))
284 return 0644;
285 break;
286 default:
287 break;
288 }
289
290 return 0;
291}
292
293static u8 nct7904_chan_to_index[] = {
294 0, /* Not used */
295 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
296 18, 19, 20, 16
297};
298
299static int nct7904_read_in(struct device *dev, u32 attr, int channel,
300 long *val)
301{
302 struct nct7904_data *data = dev_get_drvdata(dev);
303 int ret, volt, index;
304
305 index = nct7904_chan_to_index[channel];
306
307 switch (attr) {
308 case hwmon_in_input:
309 ret = nct7904_read_reg16(data, BANK_0,
310 VSEN1_HV_REG + index * 2);
311 if (ret < 0)
312 return ret;
313 volt = ((ret & 0xff00) >> 5) | (ret & 0x7);
314 if (index < 14)
315 volt *= 2; /* 0.002V scale */
316 else
317 volt *= 6; /* 0.006V scale */
318 *val = volt;
319 return 0;
320 case hwmon_in_min:
321 ret = nct7904_read_reg16(data, BANK_1,
322 VSEN1_HV_LL_REG + index * 4);
323 if (ret < 0)
324 return ret;
325 volt = ((ret & 0xff00) >> 5) | (ret & 0x7);
326 if (index < 14)
327 volt *= 2; /* 0.002V scale */
328 else
329 volt *= 6; /* 0.006V scale */
330 *val = volt;
331 return 0;
332 case hwmon_in_max:
333 ret = nct7904_read_reg16(data, BANK_1,
334 VSEN1_HV_HL_REG + index * 4);
335 if (ret < 0)
336 return ret;
337 volt = ((ret & 0xff00) >> 5) | (ret & 0x7);
338 if (index < 14)
339 volt *= 2; /* 0.002V scale */
340 else
341 volt *= 6; /* 0.006V scale */
342 *val = volt;
343 return 0;
344 case hwmon_in_alarm:
345 ret = nct7904_read_reg(data, BANK_0,
346 SMI_STS1_REG + (index >> 3));
347 if (ret < 0)
348 return ret;
349 if (!data->vsen_alarm[index >> 3])
350 data->vsen_alarm[index >> 3] = ret & 0xff;
351 else
352 /* If there is new alarm showing up */
353 data->vsen_alarm[index >> 3] |= (ret & 0xff);
354 *val = (data->vsen_alarm[index >> 3] >> (index & 0x07)) & 1;
355 /* Needs to clean the alarm if alarm existing */
356 if (*val)
357 data->vsen_alarm[index >> 3] ^= 1 << (index & 0x07);
358 return 0;
359 default:
360 return -EOPNOTSUPP;
361 }
362}
363
364static umode_t nct7904_in_is_visible(const void *_data, u32 attr, int channel)
365{
366 const struct nct7904_data *data = _data;
367 int index = nct7904_chan_to_index[channel];
368
369 switch (attr) {
370 case hwmon_in_input:
371 case hwmon_in_alarm:
372 if (channel > 0 && (data->vsen_mask & BIT(index)))
373 return 0444;
374 break;
375 case hwmon_in_min:
376 case hwmon_in_max:
377 if (channel > 0 && (data->vsen_mask & BIT(index)))
378 return 0644;
379 break;
380 default:
381 break;
382 }
383
384 return 0;
385}
386
387static int nct7904_read_temp(struct device *dev, u32 attr, int channel,
388 long *val)
389{
390 struct nct7904_data *data = dev_get_drvdata(dev);
391 int ret, temp;
392 unsigned int reg1, reg2, reg3;
393 s8 temps;
394
395 switch (attr) {
396 case hwmon_temp_input:
397 if (channel == 4)
398 ret = nct7904_read_reg16(data, BANK_0, LTD_HV_REG);
399 else if (channel < 5)
400 ret = nct7904_read_reg16(data, BANK_0,
401 TEMP_CH1_HV_REG + channel * 4);
402 else
403 ret = nct7904_read_reg16(data, BANK_0,
404 T_CPU1_HV_REG + (channel - 5)
405 * 2);
406 if (ret < 0)
407 return ret;
408 temp = ((ret & 0xff00) >> 5) | (ret & 0x7);
409 *val = sign_extend32(temp, 10) * 125;
410 return 0;
411 case hwmon_temp_alarm:
412 if (channel == 4) {
413 ret = nct7904_read_reg(data, BANK_0,
414 SMI_STS3_REG);
415 if (ret < 0)
416 return ret;
417 *val = (ret >> 1) & 1;
418 } else if (channel < 4) {
419 ret = nct7904_read_reg(data, BANK_0,
420 SMI_STS1_REG);
421 if (ret < 0)
422 return ret;
423 *val = (ret >> (((channel * 2) + 1) & 0x07)) & 1;
424 } else {
425 if ((channel - 5) < 4) {
426 ret = nct7904_read_reg(data, BANK_0,
427 SMI_STS7_REG +
428 ((channel - 5) >> 3));
429 if (ret < 0)
430 return ret;
431 *val = (ret >> ((channel - 5) & 0x07)) & 1;
432 } else {
433 ret = nct7904_read_reg(data, BANK_0,
434 SMI_STS8_REG +
435 ((channel - 5) >> 3));
436 if (ret < 0)
437 return ret;
438 *val = (ret >> (((channel - 5) & 0x07) - 4))
439 & 1;
440 }
441 }
442 return 0;
443 case hwmon_temp_type:
444 if (channel < 5) {
445 if ((data->tcpu_mask >> channel) & 0x01) {
446 if ((data->temp_mode >> channel) & 0x01)
447 *val = 3; /* TD */
448 else
449 *val = 4; /* TR */
450 } else {
451 *val = 0;
452 }
453 } else {
454 if ((data->has_dts >> (channel - 5)) & 0x01) {
455 if (data->enable_dts & ENABLE_TSI)
456 *val = 5; /* TSI */
457 else
458 *val = 6; /* PECI */
459 } else {
460 *val = 0;
461 }
462 }
463 return 0;
464 case hwmon_temp_max:
465 reg1 = LTD_HV_LL_REG;
466 reg2 = TEMP_CH1_W_REG;
467 reg3 = DTS_T_CPU1_W_REG;
468 break;
469 case hwmon_temp_max_hyst:
470 reg1 = LTD_LV_LL_REG;
471 reg2 = TEMP_CH1_WH_REG;
472 reg3 = DTS_T_CPU1_WH_REG;
473 break;
474 case hwmon_temp_crit:
475 reg1 = LTD_HV_HL_REG;
476 reg2 = TEMP_CH1_C_REG;
477 reg3 = DTS_T_CPU1_C_REG;
478 break;
479 case hwmon_temp_crit_hyst:
480 reg1 = LTD_LV_HL_REG;
481 reg2 = TEMP_CH1_CH_REG;
482 reg3 = DTS_T_CPU1_CH_REG;
483 break;
484 default:
485 return -EOPNOTSUPP;
486 }
487
488 if (channel == 4)
489 ret = nct7904_read_reg(data, BANK_1, reg1);
490 else if (channel < 5)
491 ret = nct7904_read_reg(data, BANK_1,
492 reg2 + channel * 8);
493 else
494 ret = nct7904_read_reg(data, BANK_1,
495 reg3 + (channel - 5) * 4);
496
497 if (ret < 0)
498 return ret;
499 temps = ret;
500 *val = temps * 1000;
501 return 0;
502}
503
504static umode_t nct7904_temp_is_visible(const void *_data, u32 attr, int channel)
505{
506 const struct nct7904_data *data = _data;
507
508 switch (attr) {
509 case hwmon_temp_input:
510 case hwmon_temp_alarm:
511 case hwmon_temp_type:
512 if (channel < 5) {
513 if (data->tcpu_mask & BIT(channel))
514 return 0444;
515 } else {
516 if (data->has_dts & BIT(channel - 5))
517 return 0444;
518 }
519 break;
520 case hwmon_temp_max:
521 case hwmon_temp_max_hyst:
522 case hwmon_temp_crit:
523 case hwmon_temp_crit_hyst:
524 if (channel < 5) {
525 if (data->tcpu_mask & BIT(channel))
526 return 0644;
527 } else {
528 if (data->has_dts & BIT(channel - 5))
529 return 0644;
530 }
531 break;
532 default:
533 break;
534 }
535
536 return 0;
537}
538
539static int nct7904_read_pwm(struct device *dev, u32 attr, int channel,
540 long *val)
541{
542 struct nct7904_data *data = dev_get_drvdata(dev);
543 int ret;
544
545 switch (attr) {
546 case hwmon_pwm_input:
547 ret = nct7904_read_reg(data, BANK_3, FANCTL1_OUT_REG + channel);
548 if (ret < 0)
549 return ret;
550 *val = ret;
551 return 0;
552 case hwmon_pwm_enable:
553 ret = nct7904_read_reg(data, BANK_3, FANCTL1_FMR_REG + channel);
554 if (ret < 0)
555 return ret;
556
557 *val = ret ? 2 : 1;
558 return 0;
559 default:
560 return -EOPNOTSUPP;
561 }
562}
563
564static int nct7904_write_temp(struct device *dev, u32 attr, int channel,
565 long val)
566{
567 struct nct7904_data *data = dev_get_drvdata(dev);
568 int ret;
569 unsigned int reg1, reg2, reg3;
570
571 val = clamp_val(val / 1000, -128, 127);
572
573 switch (attr) {
574 case hwmon_temp_max:
575 reg1 = LTD_HV_LL_REG;
576 reg2 = TEMP_CH1_W_REG;
577 reg3 = DTS_T_CPU1_W_REG;
578 break;
579 case hwmon_temp_max_hyst:
580 reg1 = LTD_LV_LL_REG;
581 reg2 = TEMP_CH1_WH_REG;
582 reg3 = DTS_T_CPU1_WH_REG;
583 break;
584 case hwmon_temp_crit:
585 reg1 = LTD_HV_HL_REG;
586 reg2 = TEMP_CH1_C_REG;
587 reg3 = DTS_T_CPU1_C_REG;
588 break;
589 case hwmon_temp_crit_hyst:
590 reg1 = LTD_LV_HL_REG;
591 reg2 = TEMP_CH1_CH_REG;
592 reg3 = DTS_T_CPU1_CH_REG;
593 break;
594 default:
595 return -EOPNOTSUPP;
596 }
597 if (channel == 4)
598 ret = nct7904_write_reg(data, BANK_1, reg1, val);
599 else if (channel < 5)
600 ret = nct7904_write_reg(data, BANK_1,
601 reg2 + channel * 8, val);
602 else
603 ret = nct7904_write_reg(data, BANK_1,
604 reg3 + (channel - 5) * 4, val);
605
606 return ret;
607}
608
609static int nct7904_write_fan(struct device *dev, u32 attr, int channel,
610 long val)
611{
612 struct nct7904_data *data = dev_get_drvdata(dev);
613 int ret;
614 u8 tmp;
615
616 switch (attr) {
617 case hwmon_fan_min:
618 if (val <= 0)
619 return -EINVAL;
620
621 val = clamp_val(DIV_ROUND_CLOSEST(1350000, val), 1, 0x1fff);
622 tmp = (val >> 5) & 0xff;
623 ret = nct7904_write_reg(data, BANK_1,
624 FANIN1_HV_HL_REG + channel * 2, tmp);
625 if (ret < 0)
626 return ret;
627 tmp = val & 0x1f;
628 ret = nct7904_write_reg(data, BANK_1,
629 FANIN1_LV_HL_REG + channel * 2, tmp);
630 return ret;
631 default:
632 return -EOPNOTSUPP;
633 }
634}
635
636static int nct7904_write_in(struct device *dev, u32 attr, int channel,
637 long val)
638{
639 struct nct7904_data *data = dev_get_drvdata(dev);
640 int ret, index, tmp;
641
642 index = nct7904_chan_to_index[channel];
643
644 if (index < 14)
645 val = val / 2; /* 0.002V scale */
646 else
647 val = val / 6; /* 0.006V scale */
648
649 val = clamp_val(val, 0, 0x7ff);
650
651 switch (attr) {
652 case hwmon_in_min:
653 tmp = nct7904_read_reg(data, BANK_1,
654 VSEN1_LV_LL_REG + index * 4);
655 if (tmp < 0)
656 return tmp;
657 tmp &= ~0x7;
658 tmp |= val & 0x7;
659 ret = nct7904_write_reg(data, BANK_1,
660 VSEN1_LV_LL_REG + index * 4, tmp);
661 if (ret < 0)
662 return ret;
663 tmp = nct7904_read_reg(data, BANK_1,
664 VSEN1_HV_LL_REG + index * 4);
665 if (tmp < 0)
666 return tmp;
667 tmp = (val >> 3) & 0xff;
668 ret = nct7904_write_reg(data, BANK_1,
669 VSEN1_HV_LL_REG + index * 4, tmp);
670 return ret;
671 case hwmon_in_max:
672 tmp = nct7904_read_reg(data, BANK_1,
673 VSEN1_LV_HL_REG + index * 4);
674 if (tmp < 0)
675 return tmp;
676 tmp &= ~0x7;
677 tmp |= val & 0x7;
678 ret = nct7904_write_reg(data, BANK_1,
679 VSEN1_LV_HL_REG + index * 4, tmp);
680 if (ret < 0)
681 return ret;
682 tmp = nct7904_read_reg(data, BANK_1,
683 VSEN1_HV_HL_REG + index * 4);
684 if (tmp < 0)
685 return tmp;
686 tmp = (val >> 3) & 0xff;
687 ret = nct7904_write_reg(data, BANK_1,
688 VSEN1_HV_HL_REG + index * 4, tmp);
689 return ret;
690 default:
691 return -EOPNOTSUPP;
692 }
693}
694
695static int nct7904_write_pwm(struct device *dev, u32 attr, int channel,
696 long val)
697{
698 struct nct7904_data *data = dev_get_drvdata(dev);
699 int ret;
700
701 switch (attr) {
702 case hwmon_pwm_input:
703 if (val < 0 || val > 255)
704 return -EINVAL;
705 ret = nct7904_write_reg(data, BANK_3, FANCTL1_OUT_REG + channel,
706 val);
707 return ret;
708 case hwmon_pwm_enable:
709 if (val < 1 || val > 2 ||
710 (val == 2 && !data->fan_mode[channel]))
711 return -EINVAL;
712 ret = nct7904_write_reg(data, BANK_3, FANCTL1_FMR_REG + channel,
713 val == 2 ? data->fan_mode[channel] : 0);
714 return ret;
715 default:
716 return -EOPNOTSUPP;
717 }
718}
719
720static umode_t nct7904_pwm_is_visible(const void *_data, u32 attr, int channel)
721{
722 switch (attr) {
723 case hwmon_pwm_input:
724 case hwmon_pwm_enable:
725 return 0644;
726 default:
727 return 0;
728 }
729}
730
731static int nct7904_read(struct device *dev, enum hwmon_sensor_types type,
732 u32 attr, int channel, long *val)
733{
734 switch (type) {
735 case hwmon_in:
736 return nct7904_read_in(dev, attr, channel, val);
737 case hwmon_fan:
738 return nct7904_read_fan(dev, attr, channel, val);
739 case hwmon_pwm:
740 return nct7904_read_pwm(dev, attr, channel, val);
741 case hwmon_temp:
742 return nct7904_read_temp(dev, attr, channel, val);
743 default:
744 return -EOPNOTSUPP;
745 }
746}
747
748static int nct7904_write(struct device *dev, enum hwmon_sensor_types type,
749 u32 attr, int channel, long val)
750{
751 switch (type) {
752 case hwmon_in:
753 return nct7904_write_in(dev, attr, channel, val);
754 case hwmon_fan:
755 return nct7904_write_fan(dev, attr, channel, val);
756 case hwmon_pwm:
757 return nct7904_write_pwm(dev, attr, channel, val);
758 case hwmon_temp:
759 return nct7904_write_temp(dev, attr, channel, val);
760 default:
761 return -EOPNOTSUPP;
762 }
763}
764
765static umode_t nct7904_is_visible(const void *data,
766 enum hwmon_sensor_types type,
767 u32 attr, int channel)
768{
769 switch (type) {
770 case hwmon_in:
771 return nct7904_in_is_visible(data, attr, channel);
772 case hwmon_fan:
773 return nct7904_fan_is_visible(data, attr, channel);
774 case hwmon_pwm:
775 return nct7904_pwm_is_visible(data, attr, channel);
776 case hwmon_temp:
777 return nct7904_temp_is_visible(data, attr, channel);
778 default:
779 return 0;
780 }
781}
782
783/* Return 0 if detection is successful, -ENODEV otherwise */
784static int nct7904_detect(struct i2c_client *client,
785 struct i2c_board_info *info)
786{
787 struct i2c_adapter *adapter = client->adapter;
788
789 if (!i2c_check_functionality(adapter,
790 I2C_FUNC_SMBUS_READ_BYTE |
791 I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
792 return -ENODEV;
793
794 /* Determine the chip type. */
795 if (i2c_smbus_read_byte_data(client, VENDOR_ID_REG) != NUVOTON_ID ||
796 i2c_smbus_read_byte_data(client, CHIP_ID_REG) != NCT7904_ID ||
797 (i2c_smbus_read_byte_data(client, DEVICE_ID_REG) & 0xf0) != 0x50 ||
798 (i2c_smbus_read_byte_data(client, BANK_SEL_REG) & 0xf8) != 0x00)
799 return -ENODEV;
800
801 strlcpy(info->type, "nct7904", I2C_NAME_SIZE);
802
803 return 0;
804}
805
806static const struct hwmon_channel_info *nct7904_info[] = {
807 HWMON_CHANNEL_INFO(in,
808 /* dummy, skipped in is_visible */
809 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
810 HWMON_I_ALARM,
811 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
812 HWMON_I_ALARM,
813 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
814 HWMON_I_ALARM,
815 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
816 HWMON_I_ALARM,
817 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
818 HWMON_I_ALARM,
819 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
820 HWMON_I_ALARM,
821 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
822 HWMON_I_ALARM,
823 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
824 HWMON_I_ALARM,
825 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
826 HWMON_I_ALARM,
827 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
828 HWMON_I_ALARM,
829 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
830 HWMON_I_ALARM,
831 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
832 HWMON_I_ALARM,
833 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
834 HWMON_I_ALARM,
835 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
836 HWMON_I_ALARM,
837 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
838 HWMON_I_ALARM,
839 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
840 HWMON_I_ALARM,
841 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
842 HWMON_I_ALARM,
843 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
844 HWMON_I_ALARM,
845 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
846 HWMON_I_ALARM,
847 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
848 HWMON_I_ALARM,
849 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX |
850 HWMON_I_ALARM),
851 HWMON_CHANNEL_INFO(fan,
852 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_ALARM,
853 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_ALARM,
854 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_ALARM,
855 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_ALARM,
856 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_ALARM,
857 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_ALARM,
858 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_ALARM,
859 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_ALARM,
860 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_ALARM,
861 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_ALARM,
862 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_ALARM,
863 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_ALARM),
864 HWMON_CHANNEL_INFO(pwm,
865 HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
866 HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
867 HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
868 HWMON_PWM_INPUT | HWMON_PWM_ENABLE),
869 HWMON_CHANNEL_INFO(temp,
870 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_MAX |
871 HWMON_T_MAX_HYST | HWMON_T_TYPE | HWMON_T_CRIT |
872 HWMON_T_CRIT_HYST,
873 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_MAX |
874 HWMON_T_MAX_HYST | HWMON_T_TYPE | HWMON_T_CRIT |
875 HWMON_T_CRIT_HYST,
876 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_MAX |
877 HWMON_T_MAX_HYST | HWMON_T_TYPE | HWMON_T_CRIT |
878 HWMON_T_CRIT_HYST,
879 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_MAX |
880 HWMON_T_MAX_HYST | HWMON_T_TYPE | HWMON_T_CRIT |
881 HWMON_T_CRIT_HYST,
882 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_MAX |
883 HWMON_T_MAX_HYST | HWMON_T_TYPE | HWMON_T_CRIT |
884 HWMON_T_CRIT_HYST,
885 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_MAX |
886 HWMON_T_MAX_HYST | HWMON_T_TYPE | HWMON_T_CRIT |
887 HWMON_T_CRIT_HYST,
888 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_MAX |
889 HWMON_T_MAX_HYST | HWMON_T_TYPE | HWMON_T_CRIT |
890 HWMON_T_CRIT_HYST,
891 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_MAX |
892 HWMON_T_MAX_HYST | HWMON_T_TYPE | HWMON_T_CRIT |
893 HWMON_T_CRIT_HYST,
894 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_MAX |
895 HWMON_T_MAX_HYST | HWMON_T_TYPE | HWMON_T_CRIT |
896 HWMON_T_CRIT_HYST,
897 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_MAX |
898 HWMON_T_MAX_HYST | HWMON_T_TYPE | HWMON_T_CRIT |
899 HWMON_T_CRIT_HYST,
900 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_MAX |
901 HWMON_T_MAX_HYST | HWMON_T_TYPE | HWMON_T_CRIT |
902 HWMON_T_CRIT_HYST,
903 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_MAX |
904 HWMON_T_MAX_HYST | HWMON_T_TYPE | HWMON_T_CRIT |
905 HWMON_T_CRIT_HYST,
906 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_MAX |
907 HWMON_T_MAX_HYST | HWMON_T_TYPE | HWMON_T_CRIT |
908 HWMON_T_CRIT_HYST),
909 NULL
910};
911
912static const struct hwmon_ops nct7904_hwmon_ops = {
913 .is_visible = nct7904_is_visible,
914 .read = nct7904_read,
915 .write = nct7904_write,
916};
917
918static const struct hwmon_chip_info nct7904_chip_info = {
919 .ops = &nct7904_hwmon_ops,
920 .info = nct7904_info,
921};
922
923/*
924 * Watchdog Function
925 */
926static int nct7904_wdt_start(struct watchdog_device *wdt)
927{
928 struct nct7904_data *data = watchdog_get_drvdata(wdt);
929
930 /* Enable soft watchdog timer */
931 return nct7904_write_reg(data, BANK_0, WDT_LOCK_REG, WDT_SOFT_EN);
932}
933
934static int nct7904_wdt_stop(struct watchdog_device *wdt)
935{
936 struct nct7904_data *data = watchdog_get_drvdata(wdt);
937
938 return nct7904_write_reg(data, BANK_0, WDT_LOCK_REG, WDT_SOFT_DIS);
939}
940
941static int nct7904_wdt_set_timeout(struct watchdog_device *wdt,
942 unsigned int timeout)
943{
944 struct nct7904_data *data = watchdog_get_drvdata(wdt);
945 /*
946 * The NCT7904 is very special in watchdog function.
947 * Its minimum unit is minutes. And wdt->timeout needs
948 * to match the actual timeout selected. So, this needs
949 * to be: wdt->timeout = timeout / 60 * 60.
950 * For example, if the user configures a timeout of
951 * 119 seconds, the actual timeout will be 60 seconds.
952 * So, wdt->timeout must then be set to 60 seconds.
953 */
954 wdt->timeout = timeout / 60 * 60;
955
956 return nct7904_write_reg(data, BANK_0, WDT_TIMER_REG,
957 wdt->timeout / 60);
958}
959
960static int nct7904_wdt_ping(struct watchdog_device *wdt)
961{
962 /*
963 * Note:
964 * NCT7904 does not support refreshing WDT_TIMER_REG register when
965 * the watchdog is active. Please disable watchdog before feeding
966 * the watchdog and enable it again.
967 */
968 struct nct7904_data *data = watchdog_get_drvdata(wdt);
969 int ret;
970
971 /* Disable soft watchdog timer */
972 ret = nct7904_write_reg(data, BANK_0, WDT_LOCK_REG, WDT_SOFT_DIS);
973 if (ret < 0)
974 return ret;
975
976 /* feed watchdog */
977 ret = nct7904_write_reg(data, BANK_0, WDT_TIMER_REG, wdt->timeout / 60);
978 if (ret < 0)
979 return ret;
980
981 /* Enable soft watchdog timer */
982 return nct7904_write_reg(data, BANK_0, WDT_LOCK_REG, WDT_SOFT_EN);
983}
984
985static unsigned int nct7904_wdt_get_timeleft(struct watchdog_device *wdt)
986{
987 struct nct7904_data *data = watchdog_get_drvdata(wdt);
988 int ret;
989
990 ret = nct7904_read_reg(data, BANK_0, WDT_TIMER_REG);
991 if (ret < 0)
992 return 0;
993
994 return ret * 60;
995}
996
997static const struct watchdog_info nct7904_wdt_info = {
998 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
999 WDIOF_MAGICCLOSE,
1000 .identity = "nct7904 watchdog",
1001};
1002
1003static const struct watchdog_ops nct7904_wdt_ops = {
1004 .owner = THIS_MODULE,
1005 .start = nct7904_wdt_start,
1006 .stop = nct7904_wdt_stop,
1007 .ping = nct7904_wdt_ping,
1008 .set_timeout = nct7904_wdt_set_timeout,
1009 .get_timeleft = nct7904_wdt_get_timeleft,
1010};
1011
1012static int nct7904_probe(struct i2c_client *client)
1013{
1014 struct nct7904_data *data;
1015 struct device *hwmon_dev;
1016 struct device *dev = &client->dev;
1017 int ret, i;
1018 u32 mask;
1019 u8 val, bit;
1020
1021 data = devm_kzalloc(dev, sizeof(struct nct7904_data), GFP_KERNEL);
1022 if (!data)
1023 return -ENOMEM;
1024
1025 data->client = client;
1026 mutex_init(&data->bank_lock);
1027 data->bank_sel = -1;
1028
1029 /* Setup sensor groups. */
1030 /* FANIN attributes */
1031 ret = nct7904_read_reg16(data, BANK_0, FANIN_CTRL0_REG);
1032 if (ret < 0)
1033 return ret;
1034 data->fanin_mask = (ret >> 8) | ((ret & 0xff) << 8);
1035
1036 /*
1037 * VSEN attributes
1038 *
1039 * Note: voltage sensors overlap with external temperature
1040 * sensors. So, if we ever decide to support the latter
1041 * we will have to adjust 'vsen_mask' accordingly.
1042 */
1043 mask = 0;
1044 ret = nct7904_read_reg16(data, BANK_0, VT_ADC_CTRL0_REG);
1045 if (ret >= 0)
1046 mask = (ret >> 8) | ((ret & 0xff) << 8);
1047 ret = nct7904_read_reg(data, BANK_0, VT_ADC_CTRL2_REG);
1048 if (ret >= 0)
1049 mask |= (ret << 16);
1050 data->vsen_mask = mask;
1051
1052 /* CPU_TEMP attributes */
1053 ret = nct7904_read_reg(data, BANK_0, VT_ADC_CTRL0_REG);
1054 if (ret < 0)
1055 return ret;
1056
1057 if ((ret & 0x6) == 0x6)
1058 data->tcpu_mask |= 1; /* TR1 */
1059 if ((ret & 0x18) == 0x18)
1060 data->tcpu_mask |= 2; /* TR2 */
1061 if ((ret & 0x20) == 0x20)
1062 data->tcpu_mask |= 4; /* TR3 */
1063 if ((ret & 0x80) == 0x80)
1064 data->tcpu_mask |= 8; /* TR4 */
1065
1066 /* LTD */
1067 ret = nct7904_read_reg(data, BANK_0, VT_ADC_CTRL2_REG);
1068 if (ret < 0)
1069 return ret;
1070 if ((ret & 0x02) == 0x02)
1071 data->tcpu_mask |= 0x10;
1072
1073 /* Multi-Function detecting for Volt and TR/TD */
1074 ret = nct7904_read_reg(data, BANK_0, VT_ADC_MD_REG);
1075 if (ret < 0)
1076 return ret;
1077
1078 data->temp_mode = 0;
1079 for (i = 0; i < 4; i++) {
1080 val = (ret >> (i * 2)) & 0x03;
1081 bit = (1 << i);
1082 if (val == VOLT_MONITOR_MODE) {
1083 data->tcpu_mask &= ~bit;
1084 } else if (val == THERMAL_DIODE_MODE && i < 2) {
1085 data->temp_mode |= bit;
1086 data->vsen_mask &= ~(0x06 << (i * 2));
1087 } else if (val == THERMISTOR_MODE) {
1088 data->vsen_mask &= ~(0x02 << (i * 2));
1089 } else {
1090 /* Reserved */
1091 data->tcpu_mask &= ~bit;
1092 data->vsen_mask &= ~(0x06 << (i * 2));
1093 }
1094 }
1095
1096 /* PECI */
1097 ret = nct7904_read_reg(data, BANK_2, PFE_REG);
1098 if (ret < 0)
1099 return ret;
1100 if (ret & 0x80) {
1101 data->enable_dts = 1; /* Enable DTS & PECI */
1102 } else {
1103 ret = nct7904_read_reg(data, BANK_2, TSI_CTRL_REG);
1104 if (ret < 0)
1105 return ret;
1106 if (ret & 0x80)
1107 data->enable_dts = 0x3; /* Enable DTS & TSI */
1108 }
1109
1110 /* Check DTS enable status */
1111 if (data->enable_dts) {
1112 ret = nct7904_read_reg(data, BANK_0, DTS_T_CTRL0_REG);
1113 if (ret < 0)
1114 return ret;
1115 data->has_dts = ret & 0xF;
1116 if (data->enable_dts & ENABLE_TSI) {
1117 ret = nct7904_read_reg(data, BANK_0, DTS_T_CTRL1_REG);
1118 if (ret < 0)
1119 return ret;
1120 data->has_dts |= (ret & 0xF) << 4;
1121 }
1122 }
1123
1124 for (i = 0; i < FANCTL_MAX; i++) {
1125 ret = nct7904_read_reg(data, BANK_3, FANCTL1_FMR_REG + i);
1126 if (ret < 0)
1127 return ret;
1128 data->fan_mode[i] = ret;
1129 }
1130
1131 /* Read all of SMI status register to clear alarms */
1132 for (i = 0; i < SMI_STS_MAX; i++) {
1133 ret = nct7904_read_reg(data, BANK_0, SMI_STS1_REG + i);
1134 if (ret < 0)
1135 return ret;
1136 }
1137
1138 hwmon_dev =
1139 devm_hwmon_device_register_with_info(dev, client->name, data,
1140 &nct7904_chip_info, NULL);
1141 ret = PTR_ERR_OR_ZERO(hwmon_dev);
1142 if (ret)
1143 return ret;
1144
1145 /* Watchdog initialization */
1146 data->wdt.ops = &nct7904_wdt_ops;
1147 data->wdt.info = &nct7904_wdt_info;
1148
1149 data->wdt.timeout = WATCHDOG_TIMEOUT * 60; /* Set default timeout */
1150 data->wdt.min_timeout = MIN_TIMEOUT;
1151 data->wdt.max_timeout = MAX_TIMEOUT;
1152 data->wdt.parent = &client->dev;
1153
1154 watchdog_init_timeout(&data->wdt, timeout * 60, &client->dev);
1155 watchdog_set_nowayout(&data->wdt, nowayout);
1156 watchdog_set_drvdata(&data->wdt, data);
1157
1158 watchdog_stop_on_unregister(&data->wdt);
1159
1160 return devm_watchdog_register_device(dev, &data->wdt);
1161}
1162
1163static const struct i2c_device_id nct7904_id[] = {
1164 {"nct7904", 0},
1165 {}
1166};
1167MODULE_DEVICE_TABLE(i2c, nct7904_id);
1168
1169static struct i2c_driver nct7904_driver = {
1170 .class = I2C_CLASS_HWMON,
1171 .driver = {
1172 .name = "nct7904",
1173 },
1174 .probe_new = nct7904_probe,
1175 .id_table = nct7904_id,
1176 .detect = nct7904_detect,
1177 .address_list = normal_i2c,
1178};
1179
1180module_i2c_driver(nct7904_driver);
1181
1182MODULE_AUTHOR("Vadim V. Vlasov <vvlasov@dev.rtsoft.ru>");
1183MODULE_DESCRIPTION("Hwmon driver for NUVOTON NCT7904");
1184MODULE_LICENSE("GPL");