drivers/hwmon/nct7802.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * nct7802 - Driver for Nuvoton NCT7802Y
   4  *
   5  * Copyright (C) 2014  Guenter Roeck <linux@roeck-us.net>
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/err.h>
  11 #include <linux/i2c.h>
  12 #include <linux/init.h>
  13 #include <linux/hwmon.h>
  14 #include <linux/hwmon-sysfs.h>
  15 #include <linux/jiffies.h>
  16 #include <linux/module.h>
  17 #include <linux/mutex.h>
  18 #include <linux/regmap.h>
  19 #include <linux/slab.h>
  20
  21 #define DRVNAME "nct7802"
  22
  23 static const u8 REG_VOLTAGE[5] = { 0x09, 0x0a, 0x0c, 0x0d, 0x0e };
  24
  25 static const u8 REG_VOLTAGE_LIMIT_LSB[2][5] = {
  26         { 0x46, 0x00, 0x40, 0x42, 0x44 },
  27         { 0x45, 0x00, 0x3f, 0x41, 0x43 },
  28 };
  29
  30 static const u8 REG_VOLTAGE_LIMIT_MSB[5] = { 0x48, 0x00, 0x47, 0x47, 0x48 };
  31
  32 static const u8 REG_VOLTAGE_LIMIT_MSB_SHIFT[2][5] = {
  33         { 0, 0, 4, 0, 4 },
  34         { 2, 0, 6, 2, 6 },
  35 };
  36
  37 #define REG_BANK                0x00
  38 #define REG_TEMP_LSB            0x05
  39 #define REG_TEMP_PECI_LSB       0x08
  40 #define REG_VOLTAGE_LOW         0x0f
  41 #define REG_FANCOUNT_LOW        0x13
  42 #define REG_START               0x21
  43 #define REG_MODE                0x22 /* 7.2.32 Mode Selection Register */
  44 #define REG_PECI_ENABLE         0x23
  45 #define REG_FAN_ENABLE          0x24
  46 #define REG_VMON_ENABLE         0x25
  47 #define REG_PWM(x)              (0x60 + (x))
  48 #define REG_SMARTFAN_EN(x)      (0x64 + (x) / 2)
  49 #define SMARTFAN_EN_SHIFT(x)    ((x) % 2 * 4)
  50 #define REG_VENDOR_ID           0xfd
  51 #define REG_CHIP_ID             0xfe
  52 #define REG_VERSION_ID          0xff
  53
  54 /*
  55  * Resistance temperature detector (RTD) modes according to 7.2.32 Mode
  56  * Selection Register
  57  */
  58 #define RTD_MODE_CURRENT        0x1
  59 #define RTD_MODE_THERMISTOR     0x2
  60 #define RTD_MODE_VOLTAGE        0x3
  61
  62 #define MODE_RTD_MASK           0x3
  63 #define MODE_LTD_EN             0x40
  64
  65 /*
  66  * Bit offset for sensors modes in REG_MODE.
  67  * Valid for index 0..2, indicating RTD1..3.
  68  */
  69 #define MODE_BIT_OFFSET_RTD(index) ((index) * 2)
  70
  71 /*
  72  * Data structures and manipulation thereof
  73  */
  74
  75 struct nct7802_data {
  76         struct regmap *regmap;
  77         struct mutex access_lock; /* for multi-byte read and write operations */
  78         u8 in_status;
  79         struct mutex in_alarm_lock;
  80 };
  81
  82 static ssize_t temp_type_show(struct device *dev,
  83                               struct device_attribute *attr, char *buf)
  84 {
  85         struct nct7802_data *data = dev_get_drvdata(dev);
  86         struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
  87         unsigned int mode;
  88         int ret;
  89
  90         ret = regmap_read(data->regmap, REG_MODE, &mode);
  91         if (ret < 0)
  92                 return ret;
  93
  94         return sprintf(buf, "%u\n", (mode >> (2 * sattr->index) & 3) + 2);
  95 }
  96
  97 static ssize_t temp_type_store(struct device *dev,
  98                                struct device_attribute *attr, const char *buf,
  99                                size_t count)
 100 {
 101         struct nct7802_data *data = dev_get_drvdata(dev);
 102         struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
 103         unsigned int type;
 104         int err;
 105
 106         err = kstrtouint(buf, 0, &type);
 107         if (err < 0)
 108                 return err;
 109         if (sattr->index == 2 && type != 4) /* RD3 */
 110                 return -EINVAL;
 111         if (type < 3 || type > 4)
 112                 return -EINVAL;
 113         err = regmap_update_bits(data->regmap, REG_MODE,
 114                         3 << 2 * sattr->index, (type - 2) << 2 * sattr->index);
 115         return err ? : count;
 116 }
 117
 118 static ssize_t pwm_mode_show(struct device *dev,
 119                              struct device_attribute *attr, char *buf)
 120 {
 121         struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
 122         struct nct7802_data *data = dev_get_drvdata(dev);
 123         unsigned int regval;
 124         int ret;
 125
 126         if (sattr->index > 1)
 127                 return sprintf(buf, "1\n");
 128
 129         ret = regmap_read(data->regmap, 0x5E, &regval);
 130         if (ret < 0)
 131                 return ret;
 132
 133         return sprintf(buf, "%u\n", !(regval & (1 << sattr->index)));
 134 }
 135
 136 static ssize_t pwm_show(struct device *dev, struct device_attribute *devattr,
 137                         char *buf)
 138 {
 139         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 140         struct nct7802_data *data = dev_get_drvdata(dev);
 141         unsigned int val;
 142         int ret;
 143
 144         if (!attr->index)
 145                 return sprintf(buf, "255\n");
 146
 147         ret = regmap_read(data->regmap, attr->index, &val);
 148         if (ret < 0)
 149                 return ret;
 150
 151         return sprintf(buf, "%d\n", val);
 152 }
 153
 154 static ssize_t pwm_store(struct device *dev, struct device_attribute *devattr,
 155                          const char *buf, size_t count)
 156 {
 157         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 158         struct nct7802_data *data = dev_get_drvdata(dev);
 159         int err;
 160         u8 val;
 161
 162         err = kstrtou8(buf, 0, &val);
 163         if (err < 0)
 164                 return err;
 165
 166         err = regmap_write(data->regmap, attr->index, val);
 167         return err ? : count;
 168 }
 169
 170 static ssize_t pwm_enable_show(struct device *dev,
 171                                struct device_attribute *attr, char *buf)
 172 {
 173         struct nct7802_data *data = dev_get_drvdata(dev);
 174         struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
 175         unsigned int reg, enabled;
 176         int ret;
 177
 178         ret = regmap_read(data->regmap, REG_SMARTFAN_EN(sattr->index), &reg);
 179         if (ret < 0)
 180                 return ret;
 181         enabled = reg >> SMARTFAN_EN_SHIFT(sattr->index) & 1;
 182         return sprintf(buf, "%u\n", enabled + 1);
 183 }
 184
 185 static ssize_t pwm_enable_store(struct device *dev,
 186                                 struct device_attribute *attr,
 187                                 const char *buf, size_t count)
 188 {
 189         struct nct7802_data *data = dev_get_drvdata(dev);
 190         struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
 191         u8 val;
 192         int ret;
 193
 194         ret = kstrtou8(buf, 0, &val);
 195         if (ret < 0)
 196                 return ret;
 197         if (val < 1 || val > 2)
 198                 return -EINVAL;
 199         ret = regmap_update_bits(data->regmap, REG_SMARTFAN_EN(sattr->index),
 200                                  1 << SMARTFAN_EN_SHIFT(sattr->index),
 201                                  (val - 1) << SMARTFAN_EN_SHIFT(sattr->index));
 202         return ret ? : count;
 203 }
 204
 205 static int nct7802_read_temp(struct nct7802_data *data,
 206                              u8 reg_temp, u8 reg_temp_low, int *temp)
 207 {
 208         unsigned int t1, t2 = 0;
 209         int err;
 210
 211         *temp = 0;
 212
 213         mutex_lock(&data->access_lock);
 214         err = regmap_read(data->regmap, reg_temp, &t1);
 215         if (err < 0)
 216                 goto abort;
 217         t1 <<= 8;
 218         if (reg_temp_low) {     /* 11 bit data */
 219                 err = regmap_read(data->regmap, reg_temp_low, &t2);
 220                 if (err < 0)
 221                         goto abort;
 222         }
 223         t1 |= t2 & 0xe0;
 224         *temp = (s16)t1 / 32 * 125;
 225 abort:
 226         mutex_unlock(&data->access_lock);
 227         return err;
 228 }
 229
 230 static int nct7802_read_fan(struct nct7802_data *data, u8 reg_fan)
 231 {
 232         unsigned int f1, f2;
 233         int ret;
 234
 235         mutex_lock(&data->access_lock);
 236         ret = regmap_read(data->regmap, reg_fan, &f1);
 237         if (ret < 0)
 238                 goto abort;
 239         ret = regmap_read(data->regmap, REG_FANCOUNT_LOW, &f2);
 240         if (ret < 0)
 241                 goto abort;
 242         ret = (f1 << 5) | (f2 >> 3);
 243         /* convert fan count to rpm */
 244         if (ret == 0x1fff)      /* maximum value, assume fan is stopped */
 245                 ret = 0;
 246         else if (ret)
 247                 ret = DIV_ROUND_CLOSEST(1350000U, ret);
 248 abort:
 249         mutex_unlock(&data->access_lock);
 250         return ret;
 251 }
 252
 253 static int nct7802_read_fan_min(struct nct7802_data *data, u8 reg_fan_low,
 254                                 u8 reg_fan_high)
 255 {
 256         unsigned int f1, f2;
 257         int ret;
 258
 259         mutex_lock(&data->access_lock);
 260         ret = regmap_read(data->regmap, reg_fan_low, &f1);
 261         if (ret < 0)
 262                 goto abort;
 263         ret = regmap_read(data->regmap, reg_fan_high, &f2);
 264         if (ret < 0)
 265                 goto abort;
 266         ret = f1 | ((f2 & 0xf8) << 5);
 267         /* convert fan count to rpm */
 268         if (ret == 0x1fff)      /* maximum value, assume no limit */
 269                 ret = 0;
 270         else if (ret)
 271                 ret = DIV_ROUND_CLOSEST(1350000U, ret);
 272         else
 273                 ret = 1350000U;
 274 abort:
 275         mutex_unlock(&data->access_lock);
 276         return ret;
 277 }
 278
 279 static int nct7802_write_fan_min(struct nct7802_data *data, u8 reg_fan_low,
 280                                  u8 reg_fan_high, unsigned long limit)
 281 {
 282         int err;
 283
 284         if (limit)
 285                 limit = DIV_ROUND_CLOSEST(1350000U, limit);
 286         else
 287                 limit = 0x1fff;
 288         limit = clamp_val(limit, 0, 0x1fff);
 289
 290         mutex_lock(&data->access_lock);
 291         err = regmap_write(data->regmap, reg_fan_low, limit & 0xff);
 292         if (err < 0)
 293                 goto abort;
 294
 295         err = regmap_write(data->regmap, reg_fan_high, (limit & 0x1f00) >> 5);
 296 abort:
 297         mutex_unlock(&data->access_lock);
 298         return err;
 299 }
 300
 301 static u8 nct7802_vmul[] = { 4, 2, 2, 2, 2 };
 302
 303 static int nct7802_read_voltage(struct nct7802_data *data, int nr, int index)
 304 {
 305         unsigned int v1, v2;
 306         int ret;
 307
 308         mutex_lock(&data->access_lock);
 309         if (index == 0) {       /* voltage */
 310                 ret = regmap_read(data->regmap, REG_VOLTAGE[nr], &v1);
 311                 if (ret < 0)
 312                         goto abort;
 313                 ret = regmap_read(data->regmap, REG_VOLTAGE_LOW, &v2);
 314                 if (ret < 0)
 315                         goto abort;
 316                 ret = ((v1 << 2) | (v2 >> 6)) * nct7802_vmul[nr];
 317         }  else {       /* limit */
 318                 int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr];
 319
 320                 ret = regmap_read(data->regmap,
 321                                   REG_VOLTAGE_LIMIT_LSB[index - 1][nr], &v1);
 322                 if (ret < 0)
 323                         goto abort;
 324                 ret = regmap_read(data->regmap, REG_VOLTAGE_LIMIT_MSB[nr],
 325                                   &v2);
 326                 if (ret < 0)
 327                         goto abort;
 328                 ret = (v1 | ((v2 << shift) & 0x300)) * nct7802_vmul[nr];
 329         }
 330 abort:
 331         mutex_unlock(&data->access_lock);
 332         return ret;
 333 }
 334
 335 static int nct7802_write_voltage(struct nct7802_data *data, int nr, int index,
 336                                  unsigned long voltage)
 337 {
 338         int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr];
 339         int err;
 340
 341         voltage = clamp_val(voltage, 0, 0x3ff * nct7802_vmul[nr]);
 342         voltage = DIV_ROUND_CLOSEST(voltage, nct7802_vmul[nr]);
 343
 344         mutex_lock(&data->access_lock);
 345         err = regmap_write(data->regmap,
 346                            REG_VOLTAGE_LIMIT_LSB[index - 1][nr],
 347                            voltage & 0xff);
 348         if (err < 0)
 349                 goto abort;
 350
 351         err = regmap_update_bits(data->regmap, REG_VOLTAGE_LIMIT_MSB[nr],
 352                                  0x0300 >> shift, (voltage & 0x0300) >> shift);
 353 abort:
 354         mutex_unlock(&data->access_lock);
 355         return err;
 356 }
 357
 358 static ssize_t in_show(struct device *dev, struct device_attribute *attr,
 359                        char *buf)
 360 {
 361         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 362         struct nct7802_data *data = dev_get_drvdata(dev);
 363         int voltage;
 364
 365         voltage = nct7802_read_voltage(data, sattr->nr, sattr->index);
 366         if (voltage < 0)
 367                 return voltage;
 368
 369         return sprintf(buf, "%d\n", voltage);
 370 }
 371
 372 static ssize_t in_store(struct device *dev, struct device_attribute *attr,
 373                         const char *buf, size_t count)
 374 {
 375         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 376         struct nct7802_data *data = dev_get_drvdata(dev);
 377         int index = sattr->index;
 378         int nr = sattr->nr;
 379         unsigned long val;
 380         int err;
 381
 382         err = kstrtoul(buf, 10, &val);
 383         if (err < 0)
 384                 return err;
 385
 386         err = nct7802_write_voltage(data, nr, index, val);
 387         return err ? : count;
 388 }
 389
 390 static ssize_t in_alarm_show(struct device *dev, struct device_attribute *attr,
 391                              char *buf)
 392 {
 393         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 394         struct nct7802_data *data = dev_get_drvdata(dev);
 395         int volt, min, max, ret;
 396         unsigned int val;
 397
 398         mutex_lock(&data->in_alarm_lock);
 399
 400         /*
 401          * The SMI Voltage status register is the only register giving a status
 402          * for voltages. A bit is set for each input crossing a threshold, in
 403          * both direction, but the "inside" or "outside" limits info is not
 404          * available. Also this register is cleared on read.
 405          * Note: this is not explicitly spelled out in the datasheet, but
 406          * from experiment.
 407          * To deal with this we use a status cache with one validity bit and
 408          * one status bit for each input. Validity is cleared at startup and
 409          * each time the register reports a change, and the status is processed
 410          * by software based on current input value and limits.
 411          */
 412         ret = regmap_read(data->regmap, 0x1e, &val); /* SMI Voltage status */
 413         if (ret < 0)
 414                 goto abort;
 415
 416         /* invalidate cached status for all inputs crossing a threshold */
 417         data->in_status &= ~((val & 0x0f) << 4);
 418
 419         /* if cached status for requested input is invalid, update it */
 420         if (!(data->in_status & (0x10 << sattr->index))) {
 421                 ret = nct7802_read_voltage(data, sattr->nr, 0);
 422                 if (ret < 0)
 423                         goto abort;
 424                 volt = ret;
 425
 426                 ret = nct7802_read_voltage(data, sattr->nr, 1);
 427                 if (ret < 0)
 428                         goto abort;
 429                 min = ret;
 430
 431                 ret = nct7802_read_voltage(data, sattr->nr, 2);
 432                 if (ret < 0)
 433                         goto abort;
 434                 max = ret;
 435
 436                 if (volt < min || volt > max)
 437                         data->in_status |= (1 << sattr->index);
 438                 else
 439                         data->in_status &= ~(1 << sattr->index);
 440
 441                 data->in_status |= 0x10 << sattr->index;
 442         }
 443
 444         ret = sprintf(buf, "%u\n", !!(data->in_status & (1 << sattr->index)));
 445 abort:
 446         mutex_unlock(&data->in_alarm_lock);
 447         return ret;
 448 }
 449
 450 static ssize_t temp_show(struct device *dev, struct device_attribute *attr,
 451                          char *buf)
 452 {
 453         struct nct7802_data *data = dev_get_drvdata(dev);
 454         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 455         int err, temp;
 456
 457         err = nct7802_read_temp(data, sattr->nr, sattr->index, &temp);
 458         if (err < 0)
 459                 return err;
 460
 461         return sprintf(buf, "%d\n", temp);
 462 }
 463
 464 static ssize_t temp_store(struct device *dev, struct device_attribute *attr,
 465                           const char *buf, size_t count)
 466 {
 467         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 468         struct nct7802_data *data = dev_get_drvdata(dev);
 469         int nr = sattr->nr;
 470         long val;
 471         int err;
 472
 473         err = kstrtol(buf, 10, &val);
 474         if (err < 0)
 475                 return err;
 476
 477         val = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000);
 478
 479         err = regmap_write(data->regmap, nr, val & 0xff);
 480         return err ? : count;
 481 }
 482
 483 static ssize_t fan_show(struct device *dev, struct device_attribute *attr,
 484                         char *buf)
 485 {
 486         struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
 487         struct nct7802_data *data = dev_get_drvdata(dev);
 488         int speed;
 489
 490         speed = nct7802_read_fan(data, sattr->index);
 491         if (speed < 0)
 492                 return speed;
 493
 494         return sprintf(buf, "%d\n", speed);
 495 }
 496
 497 static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr,
 498                             char *buf)
 499 {
 500         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 501         struct nct7802_data *data = dev_get_drvdata(dev);
 502         int speed;
 503
 504         speed = nct7802_read_fan_min(data, sattr->nr, sattr->index);
 505         if (speed < 0)
 506                 return speed;
 507
 508         return sprintf(buf, "%d\n", speed);
 509 }
 510
 511 static ssize_t fan_min_store(struct device *dev,
 512                              struct device_attribute *attr, const char *buf,
 513                              size_t count)
 514 {
 515         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 516         struct nct7802_data *data = dev_get_drvdata(dev);
 517         unsigned long val;
 518         int err;
 519
 520         err = kstrtoul(buf, 10, &val);
 521         if (err < 0)
 522                 return err;
 523
 524         err = nct7802_write_fan_min(data, sattr->nr, sattr->index, val);
 525         return err ? : count;
 526 }
 527
 528 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
 529                           char *buf)
 530 {
 531         struct nct7802_data *data = dev_get_drvdata(dev);
 532         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 533         int bit = sattr->index;
 534         unsigned int val;
 535         int ret;
 536
 537         ret = regmap_read(data->regmap, sattr->nr, &val);
 538         if (ret < 0)
 539                 return ret;
 540
 541         return sprintf(buf, "%u\n", !!(val & (1 << bit)));
 542 }
 543
 544 static ssize_t
 545 beep_show(struct device *dev, struct device_attribute *attr, char *buf)
 546 {
 547         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 548         struct nct7802_data *data = dev_get_drvdata(dev);
 549         unsigned int regval;
 550         int err;
 551
 552         err = regmap_read(data->regmap, sattr->nr, &regval);
 553         if (err)
 554                 return err;
 555
 556         return sprintf(buf, "%u\n", !!(regval & (1 << sattr->index)));
 557 }
 558
 559 static ssize_t
 560 beep_store(struct device *dev, struct device_attribute *attr, const char *buf,
 561            size_t count)
 562 {
 563         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 564         struct nct7802_data *data = dev_get_drvdata(dev);
 565         unsigned long val;
 566         int err;
 567
 568         err = kstrtoul(buf, 10, &val);
 569         if (err < 0)
 570                 return err;
 571         if (val > 1)
 572                 return -EINVAL;
 573
 574         err = regmap_update_bits(data->regmap, sattr->nr, 1 << sattr->index,
 575                                  val ? 1 << sattr->index : 0);
 576         return err ? : count;
 577 }
 578
 579 static SENSOR_DEVICE_ATTR_RW(temp1_type, temp_type, 0);
 580 static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0x01, REG_TEMP_LSB);
 581 static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 0x31, 0);
 582 static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0x30, 0);
 583 static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 0x3a, 0);
 584
 585 static SENSOR_DEVICE_ATTR_RW(temp2_type, temp_type, 1);
 586 static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 0x02, REG_TEMP_LSB);
 587 static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 0x33, 0);
 588 static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 0x32, 0);
 589 static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 0x3b, 0);
 590
 591 static SENSOR_DEVICE_ATTR_RW(temp3_type, temp_type, 2);
 592 static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 0x03, REG_TEMP_LSB);
 593 static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 0x35, 0);
 594 static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 0x34, 0);
 595 static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 0x3c, 0);
 596
 597 static SENSOR_DEVICE_ATTR_2_RO(temp4_input, temp, 0x04, 0);
 598 static SENSOR_DEVICE_ATTR_2_RW(temp4_min, temp, 0x37, 0);
 599 static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 0x36, 0);
 600 static SENSOR_DEVICE_ATTR_2_RW(temp4_crit, temp, 0x3d, 0);
 601
 602 static SENSOR_DEVICE_ATTR_2_RO(temp5_input, temp, 0x06, REG_TEMP_PECI_LSB);
 603 static SENSOR_DEVICE_ATTR_2_RW(temp5_min, temp, 0x39, 0);
 604 static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 0x38, 0);
 605 static SENSOR_DEVICE_ATTR_2_RW(temp5_crit, temp, 0x3e, 0);
 606
 607 static SENSOR_DEVICE_ATTR_2_RO(temp6_input, temp, 0x07, REG_TEMP_PECI_LSB);
 608
 609 static SENSOR_DEVICE_ATTR_2_RO(temp1_min_alarm, alarm, 0x18, 0);
 610 static SENSOR_DEVICE_ATTR_2_RO(temp2_min_alarm, alarm, 0x18, 1);
 611 static SENSOR_DEVICE_ATTR_2_RO(temp3_min_alarm, alarm, 0x18, 2);
 612 static SENSOR_DEVICE_ATTR_2_RO(temp4_min_alarm, alarm, 0x18, 3);
 613 static SENSOR_DEVICE_ATTR_2_RO(temp5_min_alarm, alarm, 0x18, 4);
 614
 615 static SENSOR_DEVICE_ATTR_2_RO(temp1_max_alarm, alarm, 0x19, 0);
 616 static SENSOR_DEVICE_ATTR_2_RO(temp2_max_alarm, alarm, 0x19, 1);
 617 static SENSOR_DEVICE_ATTR_2_RO(temp3_max_alarm, alarm, 0x19, 2);
 618 static SENSOR_DEVICE_ATTR_2_RO(temp4_max_alarm, alarm, 0x19, 3);
 619 static SENSOR_DEVICE_ATTR_2_RO(temp5_max_alarm, alarm, 0x19, 4);
 620
 621 static SENSOR_DEVICE_ATTR_2_RO(temp1_crit_alarm, alarm, 0x1b, 0);
 622 static SENSOR_DEVICE_ATTR_2_RO(temp2_crit_alarm, alarm, 0x1b, 1);
 623 static SENSOR_DEVICE_ATTR_2_RO(temp3_crit_alarm, alarm, 0x1b, 2);
 624 static SENSOR_DEVICE_ATTR_2_RO(temp4_crit_alarm, alarm, 0x1b, 3);
 625 static SENSOR_DEVICE_ATTR_2_RO(temp5_crit_alarm, alarm, 0x1b, 4);
 626
 627 static SENSOR_DEVICE_ATTR_2_RO(temp1_fault, alarm, 0x17, 0);
 628 static SENSOR_DEVICE_ATTR_2_RO(temp2_fault, alarm, 0x17, 1);
 629 static SENSOR_DEVICE_ATTR_2_RO(temp3_fault, alarm, 0x17, 2);
 630
 631 static SENSOR_DEVICE_ATTR_2_RW(temp1_beep, beep, 0x5c, 0);
 632 static SENSOR_DEVICE_ATTR_2_RW(temp2_beep, beep, 0x5c, 1);
 633 static SENSOR_DEVICE_ATTR_2_RW(temp3_beep, beep, 0x5c, 2);
 634 static SENSOR_DEVICE_ATTR_2_RW(temp4_beep, beep, 0x5c, 3);
 635 static SENSOR_DEVICE_ATTR_2_RW(temp5_beep, beep, 0x5c, 4);
 636 static SENSOR_DEVICE_ATTR_2_RW(temp6_beep, beep, 0x5c, 5);
 637
 638 static struct attribute *nct7802_temp_attrs[] = {
 639         &sensor_dev_attr_temp1_type.dev_attr.attr,
 640         &sensor_dev_attr_temp1_input.dev_attr.attr,
 641         &sensor_dev_attr_temp1_min.dev_attr.attr,
 642         &sensor_dev_attr_temp1_max.dev_attr.attr,
 643         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 644         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 645         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 646         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 647         &sensor_dev_attr_temp1_fault.dev_attr.attr,
 648         &sensor_dev_attr_temp1_beep.dev_attr.attr,
 649
 650         &sensor_dev_attr_temp2_type.dev_attr.attr,              /* 10 */
 651         &sensor_dev_attr_temp2_input.dev_attr.attr,
 652         &sensor_dev_attr_temp2_min.dev_attr.attr,
 653         &sensor_dev_attr_temp2_max.dev_attr.attr,
 654         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 655         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 656         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 657         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 658         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 659         &sensor_dev_attr_temp2_beep.dev_attr.attr,
 660
 661         &sensor_dev_attr_temp3_type.dev_attr.attr,              /* 20 */
 662         &sensor_dev_attr_temp3_input.dev_attr.attr,
 663         &sensor_dev_attr_temp3_min.dev_attr.attr,
 664         &sensor_dev_attr_temp3_max.dev_attr.attr,
 665         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 666         &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
 667         &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 668         &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
 669         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 670         &sensor_dev_attr_temp3_beep.dev_attr.attr,
 671
 672         &sensor_dev_attr_temp4_input.dev_attr.attr,             /* 30 */
 673         &sensor_dev_attr_temp4_min.dev_attr.attr,
 674         &sensor_dev_attr_temp4_max.dev_attr.attr,
 675         &sensor_dev_attr_temp4_crit.dev_attr.attr,
 676         &sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
 677         &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
 678         &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
 679         &sensor_dev_attr_temp4_beep.dev_attr.attr,
 680
 681         &sensor_dev_attr_temp5_input.dev_attr.attr,             /* 38 */
 682         &sensor_dev_attr_temp5_min.dev_attr.attr,
 683         &sensor_dev_attr_temp5_max.dev_attr.attr,
 684         &sensor_dev_attr_temp5_crit.dev_attr.attr,
 685         &sensor_dev_attr_temp5_min_alarm.dev_attr.attr,
 686         &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
 687         &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
 688         &sensor_dev_attr_temp5_beep.dev_attr.attr,
 689
 690         &sensor_dev_attr_temp6_input.dev_attr.attr,             /* 46 */
 691         &sensor_dev_attr_temp6_beep.dev_attr.attr,
 692
 693         NULL
 694 };
 695
 696 static umode_t nct7802_temp_is_visible(struct kobject *kobj,
 697                                        struct attribute *attr, int index)
 698 {
 699         struct device *dev = kobj_to_dev(kobj);
 700         struct nct7802_data *data = dev_get_drvdata(dev);
 701         unsigned int reg;
 702         int err;
 703
 704         err = regmap_read(data->regmap, REG_MODE, &reg);
 705         if (err < 0)
 706                 return 0;
 707
 708         if (index < 10 &&
 709             (reg & 03) != 0x01 && (reg & 0x03) != 0x02)         /* RD1 */
 710                 return 0;
 711
 712         if (index >= 10 && index < 20 &&
 713             (reg & 0x0c) != 0x04 && (reg & 0x0c) != 0x08)       /* RD2 */
 714                 return 0;
 715         if (index >= 20 && index < 30 && (reg & 0x30) != 0x20)  /* RD3 */
 716                 return 0;
 717
 718         if (index >= 30 && index < 38)                          /* local */
 719                 return attr->mode;
 720
 721         err = regmap_read(data->regmap, REG_PECI_ENABLE, &reg);
 722         if (err < 0)
 723                 return 0;
 724
 725         if (index >= 38 && index < 46 && !(reg & 0x01))         /* PECI 0 */
 726                 return 0;
 727
 728         if (index >= 0x46 && (!(reg & 0x02)))                   /* PECI 1 */
 729                 return 0;
 730
 731         return attr->mode;
 732 }
 733
 734 static const struct attribute_group nct7802_temp_group = {
 735         .attrs = nct7802_temp_attrs,
 736         .is_visible = nct7802_temp_is_visible,
 737 };
 738
 739 static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, 0, 0);
 740 static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, 0, 1);
 741 static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, 0, 2);
 742 static SENSOR_DEVICE_ATTR_2_RO(in0_alarm, in_alarm, 0, 3);
 743 static SENSOR_DEVICE_ATTR_2_RW(in0_beep, beep, 0x5a, 3);
 744
 745 static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, 1, 0);
 746
 747 static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, 2, 0);
 748 static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, 2, 1);
 749 static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, 2, 2);
 750 static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, in_alarm, 2, 0);
 751 static SENSOR_DEVICE_ATTR_2_RW(in2_beep, beep, 0x5a, 0);
 752
 753 static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, 3, 0);
 754 static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, 3, 1);
 755 static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, 3, 2);
 756 static SENSOR_DEVICE_ATTR_2_RO(in3_alarm, in_alarm, 3, 1);
 757 static SENSOR_DEVICE_ATTR_2_RW(in3_beep, beep, 0x5a, 1);
 758
 759 static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, 4, 0);
 760 static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, 4, 1);
 761 static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, 4, 2);
 762 static SENSOR_DEVICE_ATTR_2_RO(in4_alarm, in_alarm, 4, 2);
 763 static SENSOR_DEVICE_ATTR_2_RW(in4_beep, beep, 0x5a, 2);
 764
 765 static struct attribute *nct7802_in_attrs[] = {
 766         &sensor_dev_attr_in0_input.dev_attr.attr,
 767         &sensor_dev_attr_in0_min.dev_attr.attr,
 768         &sensor_dev_attr_in0_max.dev_attr.attr,
 769         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 770         &sensor_dev_attr_in0_beep.dev_attr.attr,
 771
 772         &sensor_dev_attr_in1_input.dev_attr.attr,       /* 5 */
 773
 774         &sensor_dev_attr_in2_input.dev_attr.attr,       /* 6 */
 775         &sensor_dev_attr_in2_min.dev_attr.attr,
 776         &sensor_dev_attr_in2_max.dev_attr.attr,
 777         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 778         &sensor_dev_attr_in2_beep.dev_attr.attr,
 779
 780         &sensor_dev_attr_in3_input.dev_attr.attr,       /* 11 */
 781         &sensor_dev_attr_in3_min.dev_attr.attr,
 782         &sensor_dev_attr_in3_max.dev_attr.attr,
 783         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 784         &sensor_dev_attr_in3_beep.dev_attr.attr,
 785
 786         &sensor_dev_attr_in4_input.dev_attr.attr,       /* 16 */
 787         &sensor_dev_attr_in4_min.dev_attr.attr,
 788         &sensor_dev_attr_in4_max.dev_attr.attr,
 789         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 790         &sensor_dev_attr_in4_beep.dev_attr.attr,
 791
 792         NULL,
 793 };
 794
 795 static umode_t nct7802_in_is_visible(struct kobject *kobj,
 796                                      struct attribute *attr, int index)
 797 {
 798         struct device *dev = kobj_to_dev(kobj);
 799         struct nct7802_data *data = dev_get_drvdata(dev);
 800         unsigned int reg;
 801         int err;
 802
 803         if (index < 6)                                          /* VCC, VCORE */
 804                 return attr->mode;
 805
 806         err = regmap_read(data->regmap, REG_MODE, &reg);
 807         if (err < 0)
 808                 return 0;
 809
 810         if (index >= 6 && index < 11 && (reg & 0x03) != 0x03)   /* VSEN1 */
 811                 return 0;
 812         if (index >= 11 && index < 16 && (reg & 0x0c) != 0x0c)  /* VSEN2 */
 813                 return 0;
 814         if (index >= 16 && (reg & 0x30) != 0x30)                /* VSEN3 */
 815                 return 0;
 816
 817         return attr->mode;
 818 }
 819
 820 static const struct attribute_group nct7802_in_group = {
 821         .attrs = nct7802_in_attrs,
 822         .is_visible = nct7802_in_is_visible,
 823 };
 824
 825 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0x10);
 826 static SENSOR_DEVICE_ATTR_2_RW(fan1_min, fan_min, 0x49, 0x4c);
 827 static SENSOR_DEVICE_ATTR_2_RO(fan1_alarm, alarm, 0x1a, 0);
 828 static SENSOR_DEVICE_ATTR_2_RW(fan1_beep, beep, 0x5b, 0);
 829 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 0x11);
 830 static SENSOR_DEVICE_ATTR_2_RW(fan2_min, fan_min, 0x4a, 0x4d);
 831 static SENSOR_DEVICE_ATTR_2_RO(fan2_alarm, alarm, 0x1a, 1);
 832 static SENSOR_DEVICE_ATTR_2_RW(fan2_beep, beep, 0x5b, 1);
 833 static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 0x12);
 834 static SENSOR_DEVICE_ATTR_2_RW(fan3_min, fan_min, 0x4b, 0x4e);
 835 static SENSOR_DEVICE_ATTR_2_RO(fan3_alarm, alarm, 0x1a, 2);
 836 static SENSOR_DEVICE_ATTR_2_RW(fan3_beep, beep, 0x5b, 2);
 837
 838 /* 7.2.89 Fan Control Output Type */
 839 static SENSOR_DEVICE_ATTR_RO(pwm1_mode, pwm_mode, 0);
 840 static SENSOR_DEVICE_ATTR_RO(pwm2_mode, pwm_mode, 1);
 841 static SENSOR_DEVICE_ATTR_RO(pwm3_mode, pwm_mode, 2);
 842
 843 /* 7.2.91... Fan Control Output Value */
 844 static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, REG_PWM(0));
 845 static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, REG_PWM(1));
 846 static SENSOR_DEVICE_ATTR_RW(pwm3, pwm, REG_PWM(2));
 847
 848 /* 7.2.95... Temperature to Fan mapping Relationships Register */
 849 static SENSOR_DEVICE_ATTR_RW(pwm1_enable, pwm_enable, 0);
 850 static SENSOR_DEVICE_ATTR_RW(pwm2_enable, pwm_enable, 1);
 851 static SENSOR_DEVICE_ATTR_RW(pwm3_enable, pwm_enable, 2);
 852
 853 static struct attribute *nct7802_fan_attrs[] = {
 854         &sensor_dev_attr_fan1_input.dev_attr.attr,
 855         &sensor_dev_attr_fan1_min.dev_attr.attr,
 856         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 857         &sensor_dev_attr_fan1_beep.dev_attr.attr,
 858         &sensor_dev_attr_fan2_input.dev_attr.attr,
 859         &sensor_dev_attr_fan2_min.dev_attr.attr,
 860         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 861         &sensor_dev_attr_fan2_beep.dev_attr.attr,
 862         &sensor_dev_attr_fan3_input.dev_attr.attr,
 863         &sensor_dev_attr_fan3_min.dev_attr.attr,
 864         &sensor_dev_attr_fan3_alarm.dev_attr.attr,
 865         &sensor_dev_attr_fan3_beep.dev_attr.attr,
 866
 867         NULL
 868 };
 869
 870 static umode_t nct7802_fan_is_visible(struct kobject *kobj,
 871                                       struct attribute *attr, int index)
 872 {
 873         struct device *dev = kobj_to_dev(kobj);
 874         struct nct7802_data *data = dev_get_drvdata(dev);
 875         int fan = index / 4;    /* 4 attributes per fan */
 876         unsigned int reg;
 877         int err;
 878
 879         err = regmap_read(data->regmap, REG_FAN_ENABLE, &reg);
 880         if (err < 0 || !(reg & (1 << fan)))
 881                 return 0;
 882
 883         return attr->mode;
 884 }
 885
 886 static const struct attribute_group nct7802_fan_group = {
 887         .attrs = nct7802_fan_attrs,
 888         .is_visible = nct7802_fan_is_visible,
 889 };
 890
 891 static struct attribute *nct7802_pwm_attrs[] = {
 892         &sensor_dev_attr_pwm1_enable.dev_attr.attr,
 893         &sensor_dev_attr_pwm1_mode.dev_attr.attr,
 894         &sensor_dev_attr_pwm1.dev_attr.attr,
 895         &sensor_dev_attr_pwm2_enable.dev_attr.attr,
 896         &sensor_dev_attr_pwm2_mode.dev_attr.attr,
 897         &sensor_dev_attr_pwm2.dev_attr.attr,
 898         &sensor_dev_attr_pwm3_enable.dev_attr.attr,
 899         &sensor_dev_attr_pwm3_mode.dev_attr.attr,
 900         &sensor_dev_attr_pwm3.dev_attr.attr,
 901         NULL
 902 };
 903
 904 static const struct attribute_group nct7802_pwm_group = {
 905         .attrs = nct7802_pwm_attrs,
 906 };
 907
 908 /* 7.2.115... 0x80-0x83, 0x84 Temperature (X-axis) transition */
 909 static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point1_temp, temp, 0x80, 0);
 910 static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point2_temp, temp, 0x81, 0);
 911 static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point3_temp, temp, 0x82, 0);
 912 static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point4_temp, temp, 0x83, 0);
 913 static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point5_temp, temp, 0x84, 0);
 914
 915 /* 7.2.120... 0x85-0x88 PWM (Y-axis) transition */
 916 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point1_pwm, pwm, 0x85);
 917 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_pwm, pwm, 0x86);
 918 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point3_pwm, pwm, 0x87);
 919 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point4_pwm, pwm, 0x88);
 920 static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point5_pwm, pwm, 0);
 921
 922 /* 7.2.124 Table 2 X-axis Transition Point 1 Register */
 923 static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point1_temp, temp, 0x90, 0);
 924 static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point2_temp, temp, 0x91, 0);
 925 static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point3_temp, temp, 0x92, 0);
 926 static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point4_temp, temp, 0x93, 0);
 927 static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point5_temp, temp, 0x94, 0);
 928
 929 /* 7.2.129 Table 2 Y-axis Transition Point 1 Register */
 930 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point1_pwm, pwm, 0x95);
 931 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point2_pwm, pwm, 0x96);
 932 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point3_pwm, pwm, 0x97);
 933 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point4_pwm, pwm, 0x98);
 934 static SENSOR_DEVICE_ATTR_RO(pwm2_auto_point5_pwm, pwm, 0);
 935
 936 /* 7.2.133 Table 3 X-axis Transition Point 1 Register */
 937 static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point1_temp, temp, 0xA0, 0);
 938 static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point2_temp, temp, 0xA1, 0);
 939 static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point3_temp, temp, 0xA2, 0);
 940 static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point4_temp, temp, 0xA3, 0);
 941 static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point5_temp, temp, 0xA4, 0);
 942
 943 /* 7.2.138 Table 3 Y-axis Transition Point 1 Register */
 944 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point1_pwm, pwm, 0xA5);
 945 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point2_pwm, pwm, 0xA6);
 946 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point3_pwm, pwm, 0xA7);
 947 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point4_pwm, pwm, 0xA8);
 948 static SENSOR_DEVICE_ATTR_RO(pwm3_auto_point5_pwm, pwm, 0);
 949
 950 static struct attribute *nct7802_auto_point_attrs[] = {
 951         &sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
 952         &sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
 953         &sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr,
 954         &sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr,
 955         &sensor_dev_attr_pwm1_auto_point5_temp.dev_attr.attr,
 956
 957         &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
 958         &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
 959         &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
 960         &sensor_dev_attr_pwm1_auto_point4_pwm.dev_attr.attr,
 961         &sensor_dev_attr_pwm1_auto_point5_pwm.dev_attr.attr,
 962
 963         &sensor_dev_attr_pwm2_auto_point1_temp.dev_attr.attr,
 964         &sensor_dev_attr_pwm2_auto_point2_temp.dev_attr.attr,
 965         &sensor_dev_attr_pwm2_auto_point3_temp.dev_attr.attr,
 966         &sensor_dev_attr_pwm2_auto_point4_temp.dev_attr.attr,
 967         &sensor_dev_attr_pwm2_auto_point5_temp.dev_attr.attr,
 968
 969         &sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr,
 970         &sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr,
 971         &sensor_dev_attr_pwm2_auto_point3_pwm.dev_attr.attr,
 972         &sensor_dev_attr_pwm2_auto_point4_pwm.dev_attr.attr,
 973         &sensor_dev_attr_pwm2_auto_point5_pwm.dev_attr.attr,
 974
 975         &sensor_dev_attr_pwm3_auto_point1_temp.dev_attr.attr,
 976         &sensor_dev_attr_pwm3_auto_point2_temp.dev_attr.attr,
 977         &sensor_dev_attr_pwm3_auto_point3_temp.dev_attr.attr,
 978         &sensor_dev_attr_pwm3_auto_point4_temp.dev_attr.attr,
 979         &sensor_dev_attr_pwm3_auto_point5_temp.dev_attr.attr,
 980
 981         &sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr,
 982         &sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr,
 983         &sensor_dev_attr_pwm3_auto_point3_pwm.dev_attr.attr,
 984         &sensor_dev_attr_pwm3_auto_point4_pwm.dev_attr.attr,
 985         &sensor_dev_attr_pwm3_auto_point5_pwm.dev_attr.attr,
 986
 987         NULL
 988 };
 989
 990 static const struct attribute_group nct7802_auto_point_group = {
 991         .attrs = nct7802_auto_point_attrs,
 992 };
 993
 994 static const struct attribute_group *nct7802_groups[] = {
 995         &nct7802_temp_group,
 996         &nct7802_in_group,
 997         &nct7802_fan_group,
 998         &nct7802_pwm_group,
 999         &nct7802_auto_point_group,
1000         NULL
1001 };
1002
1003 static int nct7802_detect(struct i2c_client *client,
1004                           struct i2c_board_info *info)
1005 {
1006         int reg;
1007
1008         /*
1009          * Chip identification registers are only available in bank 0,
1010          * so only attempt chip detection if bank 0 is selected
1011          */
1012         reg = i2c_smbus_read_byte_data(client, REG_BANK);
1013         if (reg != 0x00)
1014                 return -ENODEV;
1015
1016         reg = i2c_smbus_read_byte_data(client, REG_VENDOR_ID);
1017         if (reg != 0x50)
1018                 return -ENODEV;
1019
1020         reg = i2c_smbus_read_byte_data(client, REG_CHIP_ID);
1021         if (reg != 0xc3)
1022                 return -ENODEV;
1023
1024         reg = i2c_smbus_read_byte_data(client, REG_VERSION_ID);
1025         if (reg < 0 || (reg & 0xf0) != 0x20)
1026                 return -ENODEV;
1027
1028         /* Also validate lower bits of voltage and temperature registers */
1029         reg = i2c_smbus_read_byte_data(client, REG_TEMP_LSB);
1030         if (reg < 0 || (reg & 0x1f))
1031                 return -ENODEV;
1032
1033         reg = i2c_smbus_read_byte_data(client, REG_TEMP_PECI_LSB);
1034         if (reg < 0 || (reg & 0x3f))
1035                 return -ENODEV;
1036
1037         reg = i2c_smbus_read_byte_data(client, REG_VOLTAGE_LOW);
1038         if (reg < 0 || (reg & 0x3f))
1039                 return -ENODEV;
1040
1041         strscpy(info->type, "nct7802", I2C_NAME_SIZE);
1042         return 0;
1043 }
1044
1045 static bool nct7802_regmap_is_volatile(struct device *dev, unsigned int reg)
1046 {
1047         return (reg != REG_BANK && reg <= 0x20) ||
1048                 (reg >= REG_PWM(0) && reg <= REG_PWM(2));
1049 }
1050
1051 static const struct regmap_config nct7802_regmap_config = {
1052         .reg_bits = 8,
1053         .val_bits = 8,
1054         .cache_type = REGCACHE_RBTREE,
1055         .volatile_reg = nct7802_regmap_is_volatile,
1056 };
1057
1058 static int nct7802_get_channel_config(struct device *dev,
1059                                       struct device_node *node, u8 *mode_mask,
1060                                       u8 *mode_val)
1061 {
1062         u32 reg;
1063         const char *type_str, *md_str;
1064         u8 md;
1065
1066         if (!node->name || of_node_cmp(node->name, "channel"))
1067                 return 0;
1068
1069         if (of_property_read_u32(node, "reg", &reg)) {
1070                 dev_err(dev, "Could not read reg value for '%s'\n",
1071                         node->full_name);
1072                 return -EINVAL;
1073         }
1074
1075         if (reg > 3) {
1076                 dev_err(dev, "Invalid reg (%u) in '%s'\n", reg,
1077                         node->full_name);
1078                 return -EINVAL;
1079         }
1080
1081         if (reg == 0) {
1082                 if (!of_device_is_available(node))
1083                         *mode_val &= ~MODE_LTD_EN;
1084                 else
1085                         *mode_val |= MODE_LTD_EN;
1086                 *mode_mask |= MODE_LTD_EN;
1087                 return 0;
1088         }
1089
1090         /* At this point we have reg >= 1 && reg <= 3 */
1091
1092         if (!of_device_is_available(node)) {
1093                 *mode_val &= ~(MODE_RTD_MASK << MODE_BIT_OFFSET_RTD(reg - 1));
1094                 *mode_mask |= MODE_RTD_MASK << MODE_BIT_OFFSET_RTD(reg - 1);
1095                 return 0;
1096         }
1097
1098         if (of_property_read_string(node, "sensor-type", &type_str)) {
1099                 dev_err(dev, "No type for '%s'\n", node->full_name);
1100                 return -EINVAL;
1101         }
1102
1103         if (!strcmp(type_str, "voltage")) {
1104                 *mode_val |= (RTD_MODE_VOLTAGE & MODE_RTD_MASK)
1105                              << MODE_BIT_OFFSET_RTD(reg - 1);
1106                 *mode_mask |= MODE_RTD_MASK << MODE_BIT_OFFSET_RTD(reg - 1);
1107                 return 0;
1108         }
1109
1110         if (strcmp(type_str, "temperature")) {
1111                 dev_err(dev, "Invalid type '%s' for '%s'\n", type_str,
1112                         node->full_name);
1113                 return -EINVAL;
1114         }
1115
1116         if (reg == 3) {
1117                 /* RTD3 only supports thermistor mode */
1118                 md = RTD_MODE_THERMISTOR;
1119         } else {
1120                 if (of_property_read_string(node, "temperature-mode",
1121                                             &md_str)) {
1122                         dev_err(dev, "No mode for '%s'\n", node->full_name);
1123                         return -EINVAL;
1124                 }
1125
1126                 if (!strcmp(md_str, "thermal-diode"))
1127                         md = RTD_MODE_CURRENT;
1128                 else if (!strcmp(md_str, "thermistor"))
1129                         md = RTD_MODE_THERMISTOR;
1130                 else {
1131                         dev_err(dev, "Invalid mode '%s' for '%s'\n", md_str,
1132                                 node->full_name);
1133                         return -EINVAL;
1134                 }
1135         }
1136
1137         *mode_val |= (md & MODE_RTD_MASK) << MODE_BIT_OFFSET_RTD(reg - 1);
1138         *mode_mask |= MODE_RTD_MASK << MODE_BIT_OFFSET_RTD(reg - 1);
1139
1140         return 0;
1141 }
1142
1143 static int nct7802_configure_channels(struct device *dev,
1144                                       struct nct7802_data *data)
1145 {
1146         /* Enable local temperature sensor by default */
1147         u8 mode_mask = MODE_LTD_EN, mode_val = MODE_LTD_EN;
1148         struct device_node *node;
1149         int err;
1150
1151         if (dev->of_node) {
1152                 for_each_child_of_node(dev->of_node, node) {
1153                         err = nct7802_get_channel_config(dev, node, &mode_mask,
1154                                                          &mode_val);
1155                         if (err) {
1156                                 of_node_put(node);
1157                                 return err;
1158                         }
1159                 }
1160         }
1161
1162         return regmap_update_bits(data->regmap, REG_MODE, mode_mask, mode_val);
1163 }
1164
1165 static int nct7802_init_chip(struct device *dev, struct nct7802_data *data)
1166 {
1167         int err;
1168
1169         /* Enable ADC */
1170         err = regmap_update_bits(data->regmap, REG_START, 0x01, 0x01);
1171         if (err)
1172                 return err;
1173
1174         err = nct7802_configure_channels(dev, data);
1175         if (err)
1176                 return err;
1177
1178         /* Enable Vcore and VCC voltage monitoring */
1179         return regmap_update_bits(data->regmap, REG_VMON_ENABLE, 0x03, 0x03);
1180 }
1181
1182 static int nct7802_probe(struct i2c_client *client)
1183 {
1184         struct device *dev = &client->dev;
1185         struct nct7802_data *data;
1186         struct device *hwmon_dev;
1187         int ret;
1188
1189         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
1190         if (data == NULL)
1191                 return -ENOMEM;
1192
1193         data->regmap = devm_regmap_init_i2c(client, &nct7802_regmap_config);
1194         if (IS_ERR(data->regmap))
1195                 return PTR_ERR(data->regmap);
1196
1197         mutex_init(&data->access_lock);
1198         mutex_init(&data->in_alarm_lock);
1199
1200         ret = nct7802_init_chip(dev, data);
1201         if (ret < 0)
1202                 return ret;
1203
1204         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
1205                                                            data,
1206                                                            nct7802_groups);
1207         return PTR_ERR_OR_ZERO(hwmon_dev);
1208 }
1209
1210 static const unsigned short nct7802_address_list[] = {
1211         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END
1212 };
1213
1214 static const struct i2c_device_id nct7802_idtable[] = {
1215         { "nct7802", 0 },
1216         { }
1217 };
1218 MODULE_DEVICE_TABLE(i2c, nct7802_idtable);
1219
1220 static struct i2c_driver nct7802_driver = {
1221         .class = I2C_CLASS_HWMON,
1222         .driver = {
1223                 .name = DRVNAME,
1224         },
1225         .detect = nct7802_detect,
1226         .probe = nct7802_probe,
1227         .id_table = nct7802_idtable,
1228         .address_list = nct7802_address_list,
1229 };
1230
1231 module_i2c_driver(nct7802_driver);
1232
1233 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
1234 MODULE_DESCRIPTION("NCT7802Y Hardware Monitoring Driver");
1235 MODULE_LICENSE("GPL v2");