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