drivers/hwmon/nct7904.c

   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
 114 static int timeout;
 115 module_param(timeout, int, 0);
 116 MODULE_PARM_DESC(timeout, "Watchdog timeout in minutes. 1 <= timeout <= 255, default="
 117                         __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
 118
 119 static bool nowayout = WATCHDOG_NOWAYOUT;
 120 module_param(nowayout, bool, 0);
 121 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
 122                         __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 123
 124 static const unsigned short normal_i2c[] = {
 125         0x2d, 0x2e, I2C_CLIENT_END
 126 };
 127
 128 struct 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 */
 145 static 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
 160 static 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. */
 166 static 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  */
 184 static 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. */
 206 static 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
 220 static 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
 272 static 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
 293 static 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
 299 static 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
 364 static 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
 387 static 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
 504 static 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
 539 static 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
 564 static 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
 609 static 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
 636 static 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
 695 static 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
 720 static 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
 731 static 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
 748 static 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
 765 static 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 */
 784 static 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         strscpy(info->type, "nct7904", I2C_NAME_SIZE);
 802
 803         return 0;
 804 }
 805
 806 static const struct hwmon_channel_info * const 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
 912 static const struct hwmon_ops nct7904_hwmon_ops = {
 913         .is_visible = nct7904_is_visible,
 914         .read = nct7904_read,
 915         .write = nct7904_write,
 916 };
 917
 918 static const struct hwmon_chip_info nct7904_chip_info = {
 919         .ops = &nct7904_hwmon_ops,
 920         .info = nct7904_info,
 921 };
 922
 923 /*
 924  * Watchdog Function
 925  */
 926 static 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
 934 static 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
 941 static 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
 960 static 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
 985 static 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
 997 static const struct watchdog_info nct7904_wdt_info = {
 998         .options        = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
 999                                 WDIOF_MAGICCLOSE,
1000         .identity       = "nct7904 watchdog",
1001 };
1002
1003 static 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
1012 static 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
1163 static const struct i2c_device_id nct7904_id[] = {
1164         {"nct7904", 0},
1165         {}
1166 };
1167 MODULE_DEVICE_TABLE(i2c, nct7904_id);
1168
1169 static struct i2c_driver nct7904_driver = {
1170         .class = I2C_CLASS_HWMON,
1171         .driver = {
1172                 .name = "nct7904",
1173         },
1174         .probe = nct7904_probe,
1175         .id_table = nct7904_id,
1176         .detect = nct7904_detect,
1177         .address_list = normal_i2c,
1178 };
1179
1180 module_i2c_driver(nct7904_driver);
1181
1182 MODULE_AUTHOR("Vadim V. Vlasov <vvlasov@dev.rtsoft.ru>");
1183 MODULE_DESCRIPTION("Hwmon driver for NUVOTON NCT7904");
1184 MODULE_LICENSE("GPL");