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"); 1185