drivers/hwmon/nct7802.c

   1 /*
   2  * nct7802 - Driver for Nuvoton NCT7802Y
   3  *
   4  * Copyright (C) 2014  Guenter Roeck <linux@roeck-us.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  18
  19 #include <linux/err.h>
  20 #include <linux/i2c.h>
  21 #include <linux/init.h>
  22 #include <linux/hwmon.h>
  23 #include <linux/hwmon-sysfs.h>
  24 #include <linux/jiffies.h>
  25 #include <linux/module.h>
  26 #include <linux/mutex.h>
  27 #include <linux/regmap.h>
  28 #include <linux/slab.h>
  29
  30 #define DRVNAME "nct7802"
  31
  32 static const u8 REG_VOLTAGE[5] = { 0x09, 0x0a, 0x0c, 0x0d, 0x0e };
  33
  34 static const u8 REG_VOLTAGE_LIMIT_LSB[2][5] = {
  35         { 0x40, 0x00, 0x42, 0x44, 0x46 },
  36         { 0x3f, 0x00, 0x41, 0x43, 0x45 },
  37 };
  38
  39 static const u8 REG_VOLTAGE_LIMIT_MSB[5] = { 0x48, 0x00, 0x47, 0x47, 0x48 };
  40
  41 static const u8 REG_VOLTAGE_LIMIT_MSB_SHIFT[2][5] = {
  42         { 0, 0, 4, 0, 4 },
  43         { 2, 0, 6, 2, 6 },
  44 };
  45
  46 #define REG_BANK                0x00
  47 #define REG_TEMP_LSB            0x05
  48 #define REG_TEMP_PECI_LSB       0x08
  49 #define REG_VOLTAGE_LOW         0x0f
  50 #define REG_FANCOUNT_LOW        0x13
  51 #define REG_START               0x21
  52 #define REG_MODE                0x22 /* 7.2.32 Mode Selection Register */
  53 #define REG_PECI_ENABLE         0x23
  54 #define REG_FAN_ENABLE          0x24
  55 #define REG_VMON_ENABLE         0x25
  56 #define REG_PWM(x)              (0x60 + (x))
  57 #define REG_SMARTFAN_EN(x)      (0x64 + (x) / 2)
  58 #define SMARTFAN_EN_SHIFT(x)    ((x) % 2 * 4)
  59 #define REG_VENDOR_ID           0xfd
  60 #define REG_CHIP_ID             0xfe
  61 #define REG_VERSION_ID          0xff
  62
  63 /*
  64  * Data structures and manipulation thereof
  65  */
  66
  67 struct nct7802_data {
  68         struct regmap *regmap;
  69         struct mutex access_lock; /* for multi-byte read and write operations */
  70 };
  71
  72 static ssize_t show_temp_type(struct device *dev, struct device_attribute *attr,
  73                               char *buf)
  74 {
  75         struct nct7802_data *data = dev_get_drvdata(dev);
  76         struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
  77         unsigned int mode;
  78         int ret;
  79
  80         ret = regmap_read(data->regmap, REG_MODE, &mode);
  81         if (ret < 0)
  82                 return ret;
  83
  84         return sprintf(buf, "%u\n", (mode >> (2 * sattr->index) & 3) + 2);
  85 }
  86
  87 static ssize_t store_temp_type(struct device *dev,
  88                                struct device_attribute *attr,
  89                                const char *buf, size_t count)
  90 {
  91         struct nct7802_data *data = dev_get_drvdata(dev);
  92         struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
  93         unsigned int type;
  94         int err;
  95
  96         err = kstrtouint(buf, 0, &type);
  97         if (err < 0)
  98                 return err;
  99         if (sattr->index == 2 && type != 4) /* RD3 */
 100                 return -EINVAL;
 101         if (type < 3 || type > 4)
 102                 return -EINVAL;
 103         err = regmap_update_bits(data->regmap, REG_MODE,
 104                         3 << 2 * sattr->index, (type - 2) << 2 * sattr->index);
 105         return err ? : count;
 106 }
 107
 108 static ssize_t show_pwm_mode(struct device *dev, struct device_attribute *attr,
 109                              char *buf)
 110 {
 111         struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
 112         struct nct7802_data *data = dev_get_drvdata(dev);
 113         unsigned int regval;
 114         int ret;
 115
 116         if (sattr->index > 1)
 117                 return sprintf(buf, "1\n");
 118
 119         ret = regmap_read(data->regmap, 0x5E, &regval);
 120         if (ret < 0)
 121                 return ret;
 122
 123         return sprintf(buf, "%u\n", !(regval & (1 << sattr->index)));
 124 }
 125
 126 static ssize_t show_pwm(struct device *dev, struct device_attribute *devattr,
 127                         char *buf)
 128 {
 129         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 130         struct nct7802_data *data = dev_get_drvdata(dev);
 131         unsigned int val;
 132         int ret;
 133
 134         if (!attr->index)
 135                 return sprintf(buf, "255\n");
 136
 137         ret = regmap_read(data->regmap, attr->index, &val);
 138         if (ret < 0)
 139                 return ret;
 140
 141         return sprintf(buf, "%d\n", val);
 142 }
 143
 144 static ssize_t store_pwm(struct device *dev, struct device_attribute *devattr,
 145                          const char *buf, size_t count)
 146 {
 147         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 148         struct nct7802_data *data = dev_get_drvdata(dev);
 149         int err;
 150         u8 val;
 151
 152         err = kstrtou8(buf, 0, &val);
 153         if (err < 0)
 154                 return err;
 155
 156         err = regmap_write(data->regmap, attr->index, val);
 157         return err ? : count;
 158 }
 159
 160 static ssize_t show_pwm_enable(struct device *dev,
 161                                struct device_attribute *attr, char *buf)
 162 {
 163         struct nct7802_data *data = dev_get_drvdata(dev);
 164         struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
 165         unsigned int reg, enabled;
 166         int ret;
 167
 168         ret = regmap_read(data->regmap, REG_SMARTFAN_EN(sattr->index), &reg);
 169         if (ret < 0)
 170                 return ret;
 171         enabled = reg >> SMARTFAN_EN_SHIFT(sattr->index) & 1;
 172         return sprintf(buf, "%u\n", enabled + 1);
 173 }
 174
 175 static ssize_t store_pwm_enable(struct device *dev,
 176                                 struct device_attribute *attr,
 177                                 const char *buf, size_t count)
 178 {
 179         struct nct7802_data *data = dev_get_drvdata(dev);
 180         struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
 181         u8 val;
 182         int ret;
 183
 184         ret = kstrtou8(buf, 0, &val);
 185         if (ret < 0)
 186                 return ret;
 187         if (val < 1 || val > 2)
 188                 return -EINVAL;
 189         ret = regmap_update_bits(data->regmap, REG_SMARTFAN_EN(sattr->index),
 190                                  1 << SMARTFAN_EN_SHIFT(sattr->index),
 191                                  (val - 1) << SMARTFAN_EN_SHIFT(sattr->index));
 192         return ret ? : count;
 193 }
 194
 195 static int nct7802_read_temp(struct nct7802_data *data,
 196                              u8 reg_temp, u8 reg_temp_low, int *temp)
 197 {
 198         unsigned int t1, t2 = 0;
 199         int err;
 200
 201         *temp = 0;
 202
 203         mutex_lock(&data->access_lock);
 204         err = regmap_read(data->regmap, reg_temp, &t1);
 205         if (err < 0)
 206                 goto abort;
 207         t1 <<= 8;
 208         if (reg_temp_low) {     /* 11 bit data */
 209                 err = regmap_read(data->regmap, reg_temp_low, &t2);
 210                 if (err < 0)
 211                         goto abort;
 212         }
 213         t1 |= t2 & 0xe0;
 214         *temp = (s16)t1 / 32 * 125;
 215 abort:
 216         mutex_unlock(&data->access_lock);
 217         return err;
 218 }
 219
 220 static int nct7802_read_fan(struct nct7802_data *data, u8 reg_fan)
 221 {
 222         unsigned int f1, f2;
 223         int ret;
 224
 225         mutex_lock(&data->access_lock);
 226         ret = regmap_read(data->regmap, reg_fan, &f1);
 227         if (ret < 0)
 228                 goto abort;
 229         ret = regmap_read(data->regmap, REG_FANCOUNT_LOW, &f2);
 230         if (ret < 0)
 231                 goto abort;
 232         ret = (f1 << 5) | (f2 >> 3);
 233         /* convert fan count to rpm */
 234         if (ret == 0x1fff)      /* maximum value, assume fan is stopped */
 235                 ret = 0;
 236         else if (ret)
 237                 ret = DIV_ROUND_CLOSEST(1350000U, ret);
 238 abort:
 239         mutex_unlock(&data->access_lock);
 240         return ret;
 241 }
 242
 243 static int nct7802_read_fan_min(struct nct7802_data *data, u8 reg_fan_low,
 244                                 u8 reg_fan_high)
 245 {
 246         unsigned int f1, f2;
 247         int ret;
 248
 249         mutex_lock(&data->access_lock);
 250         ret = regmap_read(data->regmap, reg_fan_low, &f1);
 251         if (ret < 0)
 252                 goto abort;
 253         ret = regmap_read(data->regmap, reg_fan_high, &f2);
 254         if (ret < 0)
 255                 goto abort;
 256         ret = f1 | ((f2 & 0xf8) << 5);
 257         /* convert fan count to rpm */
 258         if (ret == 0x1fff)      /* maximum value, assume no limit */
 259                 ret = 0;
 260         else if (ret)
 261                 ret = DIV_ROUND_CLOSEST(1350000U, ret);
 262         else
 263                 ret = 1350000U;
 264 abort:
 265         mutex_unlock(&data->access_lock);
 266         return ret;
 267 }
 268
 269 static int nct7802_write_fan_min(struct nct7802_data *data, u8 reg_fan_low,
 270                                  u8 reg_fan_high, unsigned long limit)
 271 {
 272         int err;
 273
 274         if (limit)
 275                 limit = DIV_ROUND_CLOSEST(1350000U, limit);
 276         else
 277                 limit = 0x1fff;
 278         limit = clamp_val(limit, 0, 0x1fff);
 279
 280         mutex_lock(&data->access_lock);
 281         err = regmap_write(data->regmap, reg_fan_low, limit & 0xff);
 282         if (err < 0)
 283                 goto abort;
 284
 285         err = regmap_write(data->regmap, reg_fan_high, (limit & 0x1f00) >> 5);
 286 abort:
 287         mutex_unlock(&data->access_lock);
 288         return err;
 289 }
 290
 291 static u8 nct7802_vmul[] = { 4, 2, 2, 2, 2 };
 292
 293 static int nct7802_read_voltage(struct nct7802_data *data, int nr, int index)
 294 {
 295         unsigned int v1, v2;
 296         int ret;
 297
 298         mutex_lock(&data->access_lock);
 299         if (index == 0) {       /* voltage */
 300                 ret = regmap_read(data->regmap, REG_VOLTAGE[nr], &v1);
 301                 if (ret < 0)
 302                         goto abort;
 303                 ret = regmap_read(data->regmap, REG_VOLTAGE_LOW, &v2);
 304                 if (ret < 0)
 305                         goto abort;
 306                 ret = ((v1 << 2) | (v2 >> 6)) * nct7802_vmul[nr];
 307         }  else {       /* limit */
 308                 int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr];
 309
 310                 ret = regmap_read(data->regmap,
 311                                   REG_VOLTAGE_LIMIT_LSB[index - 1][nr], &v1);
 312                 if (ret < 0)
 313                         goto abort;
 314                 ret = regmap_read(data->regmap, REG_VOLTAGE_LIMIT_MSB[nr],
 315                                   &v2);
 316                 if (ret < 0)
 317                         goto abort;
 318                 ret = (v1 | ((v2 << shift) & 0x300)) * nct7802_vmul[nr];
 319         }
 320 abort:
 321         mutex_unlock(&data->access_lock);
 322         return ret;
 323 }
 324
 325 static int nct7802_write_voltage(struct nct7802_data *data, int nr, int index,
 326                                  unsigned long voltage)
 327 {
 328         int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr];
 329         int err;
 330
 331         voltage = clamp_val(voltage, 0, 0x3ff * nct7802_vmul[nr]);
 332         voltage = DIV_ROUND_CLOSEST(voltage, nct7802_vmul[nr]);
 333
 334         mutex_lock(&data->access_lock);
 335         err = regmap_write(data->regmap,
 336                            REG_VOLTAGE_LIMIT_LSB[index - 1][nr],
 337                            voltage & 0xff);
 338         if (err < 0)
 339                 goto abort;
 340
 341         err = regmap_update_bits(data->regmap, REG_VOLTAGE_LIMIT_MSB[nr],
 342                                  0x0300 >> shift, (voltage & 0x0300) >> shift);
 343 abort:
 344         mutex_unlock(&data->access_lock);
 345         return err;
 346 }
 347
 348 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
 349                        char *buf)
 350 {
 351         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 352         struct nct7802_data *data = dev_get_drvdata(dev);
 353         int voltage;
 354
 355         voltage = nct7802_read_voltage(data, sattr->nr, sattr->index);
 356         if (voltage < 0)
 357                 return voltage;
 358
 359         return sprintf(buf, "%d\n", voltage);
 360 }
 361
 362 static ssize_t store_in(struct device *dev, struct device_attribute *attr,
 363                         const char *buf, size_t count)
 364 {
 365         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 366         struct nct7802_data *data = dev_get_drvdata(dev);
 367         int index = sattr->index;
 368         int nr = sattr->nr;
 369         unsigned long val;
 370         int err;
 371
 372         err = kstrtoul(buf, 10, &val);
 373         if (err < 0)
 374                 return err;
 375
 376         err = nct7802_write_voltage(data, nr, index, val);
 377         return err ? : count;
 378 }
 379
 380 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
 381                          char *buf)
 382 {
 383         struct nct7802_data *data = dev_get_drvdata(dev);
 384         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 385         int err, temp;
 386
 387         err = nct7802_read_temp(data, sattr->nr, sattr->index, &temp);
 388         if (err < 0)
 389                 return err;
 390
 391         return sprintf(buf, "%d\n", temp);
 392 }
 393
 394 static ssize_t store_temp(struct device *dev, struct device_attribute *attr,
 395                           const char *buf, size_t count)
 396 {
 397         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 398         struct nct7802_data *data = dev_get_drvdata(dev);
 399         int nr = sattr->nr;
 400         long val;
 401         int err;
 402
 403         err = kstrtol(buf, 10, &val);
 404         if (err < 0)
 405                 return err;
 406
 407         val = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000);
 408
 409         err = regmap_write(data->regmap, nr, val & 0xff);
 410         return err ? : count;
 411 }
 412
 413 static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
 414                         char *buf)
 415 {
 416         struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
 417         struct nct7802_data *data = dev_get_drvdata(dev);
 418         int speed;
 419
 420         speed = nct7802_read_fan(data, sattr->index);
 421         if (speed < 0)
 422                 return speed;
 423
 424         return sprintf(buf, "%d\n", speed);
 425 }
 426
 427 static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
 428                             char *buf)
 429 {
 430         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 431         struct nct7802_data *data = dev_get_drvdata(dev);
 432         int speed;
 433
 434         speed = nct7802_read_fan_min(data, sattr->nr, sattr->index);
 435         if (speed < 0)
 436                 return speed;
 437
 438         return sprintf(buf, "%d\n", speed);
 439 }
 440
 441 static ssize_t store_fan_min(struct device *dev, struct device_attribute *attr,
 442                              const char *buf, size_t count)
 443 {
 444         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 445         struct nct7802_data *data = dev_get_drvdata(dev);
 446         unsigned long val;
 447         int err;
 448
 449         err = kstrtoul(buf, 10, &val);
 450         if (err < 0)
 451                 return err;
 452
 453         err = nct7802_write_fan_min(data, sattr->nr, sattr->index, val);
 454         return err ? : count;
 455 }
 456
 457 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 458                           char *buf)
 459 {
 460         struct nct7802_data *data = dev_get_drvdata(dev);
 461         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 462         int bit = sattr->index;
 463         unsigned int val;
 464         int ret;
 465
 466         ret = regmap_read(data->regmap, sattr->nr, &val);
 467         if (ret < 0)
 468                 return ret;
 469
 470         return sprintf(buf, "%u\n", !!(val & (1 << bit)));
 471 }
 472
 473 static ssize_t
 474 show_beep(struct device *dev, struct device_attribute *attr, char *buf)
 475 {
 476         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 477         struct nct7802_data *data = dev_get_drvdata(dev);
 478         unsigned int regval;
 479         int err;
 480
 481         err = regmap_read(data->regmap, sattr->nr, &regval);
 482         if (err)
 483                 return err;
 484
 485         return sprintf(buf, "%u\n", !!(regval & (1 << sattr->index)));
 486 }
 487
 488 static ssize_t
 489 store_beep(struct device *dev, struct device_attribute *attr, const char *buf,
 490            size_t count)
 491 {
 492         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 493         struct nct7802_data *data = dev_get_drvdata(dev);
 494         unsigned long val;
 495         int err;
 496
 497         err = kstrtoul(buf, 10, &val);
 498         if (err < 0)
 499                 return err;
 500         if (val > 1)
 501                 return -EINVAL;
 502
 503         err = regmap_update_bits(data->regmap, sattr->nr, 1 << sattr->index,
 504                                  val ? 1 << sattr->index : 0);
 505         return err ? : count;
 506 }
 507
 508 static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO | S_IWUSR,
 509                           show_temp_type, store_temp_type, 0);
 510 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0x01,
 511                             REG_TEMP_LSB);
 512 static SENSOR_DEVICE_ATTR_2(temp1_min, S_IRUGO | S_IWUSR, show_temp,
 513                             store_temp, 0x31, 0);
 514 static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp,
 515                             store_temp, 0x30, 0);
 516 static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IRUGO | S_IWUSR, show_temp,
 517                             store_temp, 0x3a, 0);
 518
 519 static SENSOR_DEVICE_ATTR(temp2_type, S_IRUGO | S_IWUSR,
 520                           show_temp_type, store_temp_type, 1);
 521 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0x02,
 522                             REG_TEMP_LSB);
 523 static SENSOR_DEVICE_ATTR_2(temp2_min, S_IRUGO | S_IWUSR, show_temp,
 524                             store_temp, 0x33, 0);
 525 static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp,
 526                             store_temp, 0x32, 0);
 527 static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IRUGO | S_IWUSR, show_temp,
 528                             store_temp, 0x3b, 0);
 529
 530 static SENSOR_DEVICE_ATTR(temp3_type, S_IRUGO | S_IWUSR,
 531                           show_temp_type, store_temp_type, 2);
 532 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 0x03,
 533                             REG_TEMP_LSB);
 534 static SENSOR_DEVICE_ATTR_2(temp3_min, S_IRUGO | S_IWUSR, show_temp,
 535                             store_temp, 0x35, 0);
 536 static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp,
 537                             store_temp, 0x34, 0);
 538 static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IRUGO | S_IWUSR, show_temp,
 539                             store_temp, 0x3c, 0);
 540
 541 static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 0x04, 0);
 542 static SENSOR_DEVICE_ATTR_2(temp4_min, S_IRUGO | S_IWUSR, show_temp,
 543                             store_temp, 0x37, 0);
 544 static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp,
 545                             store_temp, 0x36, 0);
 546 static SENSOR_DEVICE_ATTR_2(temp4_crit, S_IRUGO | S_IWUSR, show_temp,
 547                             store_temp, 0x3d, 0);
 548
 549 static SENSOR_DEVICE_ATTR_2(temp5_input, S_IRUGO, show_temp, NULL, 0x06,
 550                             REG_TEMP_PECI_LSB);
 551 static SENSOR_DEVICE_ATTR_2(temp5_min, S_IRUGO | S_IWUSR, show_temp,
 552                             store_temp, 0x39, 0);
 553 static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp,
 554                             store_temp, 0x38, 0);
 555 static SENSOR_DEVICE_ATTR_2(temp5_crit, S_IRUGO | S_IWUSR, show_temp,
 556                             store_temp, 0x3e, 0);
 557
 558 static SENSOR_DEVICE_ATTR_2(temp6_input, S_IRUGO, show_temp, NULL, 0x07,
 559                             REG_TEMP_PECI_LSB);
 560
 561 static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
 562                             0x18, 0);
 563 static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, show_alarm, NULL,
 564                             0x18, 1);
 565 static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, show_alarm, NULL,
 566                             0x18, 2);
 567 static SENSOR_DEVICE_ATTR_2(temp4_min_alarm, S_IRUGO, show_alarm, NULL,
 568                             0x18, 3);
 569 static SENSOR_DEVICE_ATTR_2(temp5_min_alarm, S_IRUGO, show_alarm, NULL,
 570                             0x18, 4);
 571
 572 static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
 573                             0x19, 0);
 574 static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, show_alarm, NULL,
 575                             0x19, 1);
 576 static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, show_alarm, NULL,
 577                             0x19, 2);
 578 static SENSOR_DEVICE_ATTR_2(temp4_max_alarm, S_IRUGO, show_alarm, NULL,
 579                             0x19, 3);
 580 static SENSOR_DEVICE_ATTR_2(temp5_max_alarm, S_IRUGO, show_alarm, NULL,
 581                             0x19, 4);
 582
 583 static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
 584                             0x1b, 0);
 585 static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, show_alarm, NULL,
 586                             0x1b, 1);
 587 static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, show_alarm, NULL,
 588                             0x1b, 2);
 589 static SENSOR_DEVICE_ATTR_2(temp4_crit_alarm, S_IRUGO, show_alarm, NULL,
 590                             0x1b, 3);
 591 static SENSOR_DEVICE_ATTR_2(temp5_crit_alarm, S_IRUGO, show_alarm, NULL,
 592                             0x1b, 4);
 593
 594 static SENSOR_DEVICE_ATTR_2(temp1_fault, S_IRUGO, show_alarm, NULL, 0x17, 0);
 595 static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_alarm, NULL, 0x17, 1);
 596 static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_alarm, NULL, 0x17, 2);
 597
 598 static SENSOR_DEVICE_ATTR_2(temp1_beep, S_IRUGO | S_IWUSR, show_beep,
 599                             store_beep, 0x5c, 0);
 600 static SENSOR_DEVICE_ATTR_2(temp2_beep, S_IRUGO | S_IWUSR, show_beep,
 601                             store_beep, 0x5c, 1);
 602 static SENSOR_DEVICE_ATTR_2(temp3_beep, S_IRUGO | S_IWUSR, show_beep,
 603                             store_beep, 0x5c, 2);
 604 static SENSOR_DEVICE_ATTR_2(temp4_beep, S_IRUGO | S_IWUSR, show_beep,
 605                             store_beep, 0x5c, 3);
 606 static SENSOR_DEVICE_ATTR_2(temp5_beep, S_IRUGO | S_IWUSR, show_beep,
 607                             store_beep, 0x5c, 4);
 608 static SENSOR_DEVICE_ATTR_2(temp6_beep, S_IRUGO | S_IWUSR, show_beep,
 609                             store_beep, 0x5c, 5);
 610
 611 static struct attribute *nct7802_temp_attrs[] = {
 612         &sensor_dev_attr_temp1_type.dev_attr.attr,
 613         &sensor_dev_attr_temp1_input.dev_attr.attr,
 614         &sensor_dev_attr_temp1_min.dev_attr.attr,
 615         &sensor_dev_attr_temp1_max.dev_attr.attr,
 616         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 617         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 618         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 619         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 620         &sensor_dev_attr_temp1_fault.dev_attr.attr,
 621         &sensor_dev_attr_temp1_beep.dev_attr.attr,
 622
 623         &sensor_dev_attr_temp2_type.dev_attr.attr,              /* 10 */
 624         &sensor_dev_attr_temp2_input.dev_attr.attr,
 625         &sensor_dev_attr_temp2_min.dev_attr.attr,
 626         &sensor_dev_attr_temp2_max.dev_attr.attr,
 627         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 628         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 629         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 630         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 631         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 632         &sensor_dev_attr_temp2_beep.dev_attr.attr,
 633
 634         &sensor_dev_attr_temp3_type.dev_attr.attr,              /* 20 */
 635         &sensor_dev_attr_temp3_input.dev_attr.attr,
 636         &sensor_dev_attr_temp3_min.dev_attr.attr,
 637         &sensor_dev_attr_temp3_max.dev_attr.attr,
 638         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 639         &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
 640         &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 641         &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
 642         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 643         &sensor_dev_attr_temp3_beep.dev_attr.attr,
 644
 645         &sensor_dev_attr_temp4_input.dev_attr.attr,             /* 30 */
 646         &sensor_dev_attr_temp4_min.dev_attr.attr,
 647         &sensor_dev_attr_temp4_max.dev_attr.attr,
 648         &sensor_dev_attr_temp4_crit.dev_attr.attr,
 649         &sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
 650         &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
 651         &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
 652         &sensor_dev_attr_temp4_beep.dev_attr.attr,
 653
 654         &sensor_dev_attr_temp5_input.dev_attr.attr,             /* 38 */
 655         &sensor_dev_attr_temp5_min.dev_attr.attr,
 656         &sensor_dev_attr_temp5_max.dev_attr.attr,
 657         &sensor_dev_attr_temp5_crit.dev_attr.attr,
 658         &sensor_dev_attr_temp5_min_alarm.dev_attr.attr,
 659         &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
 660         &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
 661         &sensor_dev_attr_temp5_beep.dev_attr.attr,
 662
 663         &sensor_dev_attr_temp6_input.dev_attr.attr,             /* 46 */
 664         &sensor_dev_attr_temp6_beep.dev_attr.attr,
 665
 666         NULL
 667 };
 668
 669 static umode_t nct7802_temp_is_visible(struct kobject *kobj,
 670                                        struct attribute *attr, int index)
 671 {
 672         struct device *dev = container_of(kobj, struct device, kobj);
 673         struct nct7802_data *data = dev_get_drvdata(dev);
 674         unsigned int reg;
 675         int err;
 676
 677         err = regmap_read(data->regmap, REG_MODE, &reg);
 678         if (err < 0)
 679                 return 0;
 680
 681         if (index < 10 &&
 682             (reg & 03) != 0x01 && (reg & 0x03) != 0x02)         /* RD1 */
 683                 return 0;
 684
 685         if (index >= 10 && index < 20 &&
 686             (reg & 0x0c) != 0x04 && (reg & 0x0c) != 0x08)       /* RD2 */
 687                 return 0;
 688         if (index >= 20 && index < 30 && (reg & 0x30) != 0x20)  /* RD3 */
 689                 return 0;
 690
 691         if (index >= 30 && index < 38)                          /* local */
 692                 return attr->mode;
 693
 694         err = regmap_read(data->regmap, REG_PECI_ENABLE, &reg);
 695         if (err < 0)
 696                 return 0;
 697
 698         if (index >= 38 && index < 46 && !(reg & 0x01))         /* PECI 0 */
 699                 return 0;
 700
 701         if (index >= 0x46 && (!(reg & 0x02)))                   /* PECI 1 */
 702                 return 0;
 703
 704         return attr->mode;
 705 }
 706
 707 static const struct attribute_group nct7802_temp_group = {
 708         .attrs = nct7802_temp_attrs,
 709         .is_visible = nct7802_temp_is_visible,
 710 };
 711
 712 static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO, show_in, NULL, 0, 0);
 713 static SENSOR_DEVICE_ATTR_2(in0_min, S_IRUGO | S_IWUSR, show_in, store_in,
 714                             0, 1);
 715 static SENSOR_DEVICE_ATTR_2(in0_max, S_IRUGO | S_IWUSR, show_in, store_in,
 716                             0, 2);
 717 static SENSOR_DEVICE_ATTR_2(in0_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 3);
 718 static SENSOR_DEVICE_ATTR_2(in0_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 719                             0x5a, 3);
 720
 721 static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO, show_in, NULL, 1, 0);
 722
 723 static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO, show_in, NULL, 2, 0);
 724 static SENSOR_DEVICE_ATTR_2(in2_min, S_IRUGO | S_IWUSR, show_in, store_in,
 725                             2, 1);
 726 static SENSOR_DEVICE_ATTR_2(in2_max, S_IRUGO | S_IWUSR, show_in, store_in,
 727                             2, 2);
 728 static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 0);
 729 static SENSOR_DEVICE_ATTR_2(in2_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 730                             0x5a, 0);
 731
 732 static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO, show_in, NULL, 3, 0);
 733 static SENSOR_DEVICE_ATTR_2(in3_min, S_IRUGO | S_IWUSR, show_in, store_in,
 734                             3, 1);
 735 static SENSOR_DEVICE_ATTR_2(in3_max, S_IRUGO | S_IWUSR, show_in, store_in,
 736                             3, 2);
 737 static SENSOR_DEVICE_ATTR_2(in3_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 1);
 738 static SENSOR_DEVICE_ATTR_2(in3_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 739                             0x5a, 1);
 740
 741 static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO, show_in, NULL, 4, 0);
 742 static SENSOR_DEVICE_ATTR_2(in4_min, S_IRUGO | S_IWUSR, show_in, store_in,
 743                             4, 1);
 744 static SENSOR_DEVICE_ATTR_2(in4_max, S_IRUGO | S_IWUSR, show_in, store_in,
 745                             4, 2);
 746 static SENSOR_DEVICE_ATTR_2(in4_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 2);
 747 static SENSOR_DEVICE_ATTR_2(in4_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 748                             0x5a, 2);
 749
 750 static struct attribute *nct7802_in_attrs[] = {
 751         &sensor_dev_attr_in0_input.dev_attr.attr,
 752         &sensor_dev_attr_in0_min.dev_attr.attr,
 753         &sensor_dev_attr_in0_max.dev_attr.attr,
 754         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 755         &sensor_dev_attr_in0_beep.dev_attr.attr,
 756
 757         &sensor_dev_attr_in1_input.dev_attr.attr,       /* 5 */
 758
 759         &sensor_dev_attr_in2_input.dev_attr.attr,       /* 6 */
 760         &sensor_dev_attr_in2_min.dev_attr.attr,
 761         &sensor_dev_attr_in2_max.dev_attr.attr,
 762         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 763         &sensor_dev_attr_in2_beep.dev_attr.attr,
 764
 765         &sensor_dev_attr_in3_input.dev_attr.attr,       /* 11 */
 766         &sensor_dev_attr_in3_min.dev_attr.attr,
 767         &sensor_dev_attr_in3_max.dev_attr.attr,
 768         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 769         &sensor_dev_attr_in3_beep.dev_attr.attr,
 770
 771         &sensor_dev_attr_in4_input.dev_attr.attr,       /* 17 */
 772         &sensor_dev_attr_in4_min.dev_attr.attr,
 773         &sensor_dev_attr_in4_max.dev_attr.attr,
 774         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 775         &sensor_dev_attr_in4_beep.dev_attr.attr,
 776
 777         NULL,
 778 };
 779
 780 static umode_t nct7802_in_is_visible(struct kobject *kobj,
 781                                      struct attribute *attr, int index)
 782 {
 783         struct device *dev = container_of(kobj, struct device, kobj);
 784         struct nct7802_data *data = dev_get_drvdata(dev);
 785         unsigned int reg;
 786         int err;
 787
 788         if (index < 6)                                          /* VCC, VCORE */
 789                 return attr->mode;
 790
 791         err = regmap_read(data->regmap, REG_MODE, &reg);
 792         if (err < 0)
 793                 return 0;
 794
 795         if (index >= 6 && index < 11 && (reg & 0x03) != 0x03)   /* VSEN1 */
 796                 return 0;
 797         if (index >= 11 && index < 17 && (reg & 0x0c) != 0x0c)  /* VSEN2 */
 798                 return 0;
 799         if (index >= 17 && (reg & 0x30) != 0x30)                /* VSEN3 */
 800                 return 0;
 801
 802         return attr->mode;
 803 }
 804
 805 static const struct attribute_group nct7802_in_group = {
 806         .attrs = nct7802_in_attrs,
 807         .is_visible = nct7802_in_is_visible,
 808 };
 809
 810 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0x10);
 811 static SENSOR_DEVICE_ATTR_2(fan1_min, S_IRUGO | S_IWUSR, show_fan_min,
 812                             store_fan_min, 0x49, 0x4c);
 813 static SENSOR_DEVICE_ATTR_2(fan1_alarm, S_IRUGO, show_alarm, NULL, 0x1a, 0);
 814 static SENSOR_DEVICE_ATTR_2(fan1_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 815                             0x5b, 0);
 816 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 0x11);
 817 static SENSOR_DEVICE_ATTR_2(fan2_min, S_IRUGO | S_IWUSR, show_fan_min,
 818                             store_fan_min, 0x4a, 0x4d);
 819 static SENSOR_DEVICE_ATTR_2(fan2_alarm, S_IRUGO, show_alarm, NULL, 0x1a, 1);
 820 static SENSOR_DEVICE_ATTR_2(fan2_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 821                             0x5b, 1);
 822 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 0x12);
 823 static SENSOR_DEVICE_ATTR_2(fan3_min, S_IRUGO | S_IWUSR, show_fan_min,
 824                             store_fan_min, 0x4b, 0x4e);
 825 static SENSOR_DEVICE_ATTR_2(fan3_alarm, S_IRUGO, show_alarm, NULL, 0x1a, 2);
 826 static SENSOR_DEVICE_ATTR_2(fan3_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 827                             0x5b, 2);
 828
 829 /* 7.2.89 Fan Control Output Type */
 830 static SENSOR_DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL, 0);
 831 static SENSOR_DEVICE_ATTR(pwm2_mode, S_IRUGO, show_pwm_mode, NULL, 1);
 832 static SENSOR_DEVICE_ATTR(pwm3_mode, S_IRUGO, show_pwm_mode, NULL, 2);
 833
 834 /* 7.2.91... Fan Control Output Value */
 835 static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, store_pwm,
 836                           REG_PWM(0));
 837 static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, show_pwm, store_pwm,
 838                           REG_PWM(1));
 839 static SENSOR_DEVICE_ATTR(pwm3, S_IRUGO | S_IWUSR, show_pwm, store_pwm,
 840                           REG_PWM(2));
 841
 842 /* 7.2.95... Temperature to Fan mapping Relationships Register */
 843 static SENSOR_DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, show_pwm_enable,
 844                           store_pwm_enable, 0);
 845 static SENSOR_DEVICE_ATTR(pwm2_enable, S_IRUGO | S_IWUSR, show_pwm_enable,
 846                           store_pwm_enable, 1);
 847 static SENSOR_DEVICE_ATTR(pwm3_enable, S_IRUGO | S_IWUSR, show_pwm_enable,
 848                           store_pwm_enable, 2);
 849
 850 static struct attribute *nct7802_fan_attrs[] = {
 851         &sensor_dev_attr_fan1_input.dev_attr.attr,
 852         &sensor_dev_attr_fan1_min.dev_attr.attr,
 853         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 854         &sensor_dev_attr_fan1_beep.dev_attr.attr,
 855         &sensor_dev_attr_fan2_input.dev_attr.attr,
 856         &sensor_dev_attr_fan2_min.dev_attr.attr,
 857         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 858         &sensor_dev_attr_fan2_beep.dev_attr.attr,
 859         &sensor_dev_attr_fan3_input.dev_attr.attr,
 860         &sensor_dev_attr_fan3_min.dev_attr.attr,
 861         &sensor_dev_attr_fan3_alarm.dev_attr.attr,
 862         &sensor_dev_attr_fan3_beep.dev_attr.attr,
 863
 864         NULL
 865 };
 866
 867 static umode_t nct7802_fan_is_visible(struct kobject *kobj,
 868                                       struct attribute *attr, int index)
 869 {
 870         struct device *dev = container_of(kobj, struct device, kobj);
 871         struct nct7802_data *data = dev_get_drvdata(dev);
 872         int fan = index / 4;    /* 4 attributes per fan */
 873         unsigned int reg;
 874         int err;
 875
 876         err = regmap_read(data->regmap, REG_FAN_ENABLE, &reg);
 877         if (err < 0 || !(reg & (1 << fan)))
 878                 return 0;
 879
 880         return attr->mode;
 881 }
 882
 883 static const struct attribute_group nct7802_fan_group = {
 884         .attrs = nct7802_fan_attrs,
 885         .is_visible = nct7802_fan_is_visible,
 886 };
 887
 888 static struct attribute *nct7802_pwm_attrs[] = {
 889         &sensor_dev_attr_pwm1_enable.dev_attr.attr,
 890         &sensor_dev_attr_pwm1_mode.dev_attr.attr,
 891         &sensor_dev_attr_pwm1.dev_attr.attr,
 892         &sensor_dev_attr_pwm2_enable.dev_attr.attr,
 893         &sensor_dev_attr_pwm2_mode.dev_attr.attr,
 894         &sensor_dev_attr_pwm2.dev_attr.attr,
 895         &sensor_dev_attr_pwm3_enable.dev_attr.attr,
 896         &sensor_dev_attr_pwm3_mode.dev_attr.attr,
 897         &sensor_dev_attr_pwm3.dev_attr.attr,
 898         NULL
 899 };
 900
 901 static const struct attribute_group nct7802_pwm_group = {
 902         .attrs = nct7802_pwm_attrs,
 903 };
 904
 905 /* 7.2.115... 0x80-0x83, 0x84 Temperature (X-axis) transition */
 906 static SENSOR_DEVICE_ATTR_2(pwm1_auto_point1_temp, S_IRUGO | S_IWUSR,
 907                             show_temp, store_temp, 0x80, 0);
 908 static SENSOR_DEVICE_ATTR_2(pwm1_auto_point2_temp, S_IRUGO | S_IWUSR,
 909                             show_temp, store_temp, 0x81, 0);
 910 static SENSOR_DEVICE_ATTR_2(pwm1_auto_point3_temp, S_IRUGO | S_IWUSR,
 911                             show_temp, store_temp, 0x82, 0);
 912 static SENSOR_DEVICE_ATTR_2(pwm1_auto_point4_temp, S_IRUGO | S_IWUSR,
 913                             show_temp, store_temp, 0x83, 0);
 914 static SENSOR_DEVICE_ATTR_2(pwm1_auto_point5_temp, S_IRUGO | S_IWUSR,
 915                             show_temp, store_temp, 0x84, 0);
 916
 917 /* 7.2.120... 0x85-0x88 PWM (Y-axis) transition */
 918 static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IRUGO | S_IWUSR,
 919                           show_pwm, store_pwm, 0x85);
 920 static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IRUGO | S_IWUSR,
 921                           show_pwm, store_pwm, 0x86);
 922 static SENSOR_DEVICE_ATTR(pwm1_auto_point3_pwm, S_IRUGO | S_IWUSR,
 923                           show_pwm, store_pwm, 0x87);
 924 static SENSOR_DEVICE_ATTR(pwm1_auto_point4_pwm, S_IRUGO | S_IWUSR,
 925                           show_pwm, store_pwm, 0x88);
 926 static SENSOR_DEVICE_ATTR(pwm1_auto_point5_pwm, S_IRUGO, show_pwm, NULL, 0);
 927
 928 /* 7.2.124 Table 2 X-axis Transition Point 1 Register */
 929 static SENSOR_DEVICE_ATTR_2(pwm2_auto_point1_temp, S_IRUGO | S_IWUSR,
 930                             show_temp, store_temp, 0x90, 0);
 931 static SENSOR_DEVICE_ATTR_2(pwm2_auto_point2_temp, S_IRUGO | S_IWUSR,
 932                             show_temp, store_temp, 0x91, 0);
 933 static SENSOR_DEVICE_ATTR_2(pwm2_auto_point3_temp, S_IRUGO | S_IWUSR,
 934                             show_temp, store_temp, 0x92, 0);
 935 static SENSOR_DEVICE_ATTR_2(pwm2_auto_point4_temp, S_IRUGO | S_IWUSR,
 936                             show_temp, store_temp, 0x93, 0);
 937 static SENSOR_DEVICE_ATTR_2(pwm2_auto_point5_temp, S_IRUGO | S_IWUSR,
 938                             show_temp, store_temp, 0x94, 0);
 939
 940 /* 7.2.129 Table 2 Y-axis Transition Point 1 Register */
 941 static SENSOR_DEVICE_ATTR(pwm2_auto_point1_pwm, S_IRUGO | S_IWUSR,
 942                           show_pwm, store_pwm, 0x95);
 943 static SENSOR_DEVICE_ATTR(pwm2_auto_point2_pwm, S_IRUGO | S_IWUSR,
 944                           show_pwm, store_pwm, 0x96);
 945 static SENSOR_DEVICE_ATTR(pwm2_auto_point3_pwm, S_IRUGO | S_IWUSR,
 946                           show_pwm, store_pwm, 0x97);
 947 static SENSOR_DEVICE_ATTR(pwm2_auto_point4_pwm, S_IRUGO | S_IWUSR,
 948                           show_pwm, store_pwm, 0x98);
 949 static SENSOR_DEVICE_ATTR(pwm2_auto_point5_pwm, S_IRUGO, show_pwm, NULL, 0);
 950
 951 /* 7.2.133 Table 3 X-axis Transition Point 1 Register */
 952 static SENSOR_DEVICE_ATTR_2(pwm3_auto_point1_temp, S_IRUGO | S_IWUSR,
 953                             show_temp, store_temp, 0xA0, 0);
 954 static SENSOR_DEVICE_ATTR_2(pwm3_auto_point2_temp, S_IRUGO | S_IWUSR,
 955                             show_temp, store_temp, 0xA1, 0);
 956 static SENSOR_DEVICE_ATTR_2(pwm3_auto_point3_temp, S_IRUGO | S_IWUSR,
 957                             show_temp, store_temp, 0xA2, 0);
 958 static SENSOR_DEVICE_ATTR_2(pwm3_auto_point4_temp, S_IRUGO | S_IWUSR,
 959                             show_temp, store_temp, 0xA3, 0);
 960 static SENSOR_DEVICE_ATTR_2(pwm3_auto_point5_temp, S_IRUGO | S_IWUSR,
 961                             show_temp, store_temp, 0xA4, 0);
 962
 963 /* 7.2.138 Table 3 Y-axis Transition Point 1 Register */
 964 static SENSOR_DEVICE_ATTR(pwm3_auto_point1_pwm, S_IRUGO | S_IWUSR,
 965                           show_pwm, store_pwm, 0xA5);
 966 static SENSOR_DEVICE_ATTR(pwm3_auto_point2_pwm, S_IRUGO | S_IWUSR,
 967                           show_pwm, store_pwm, 0xA6);
 968 static SENSOR_DEVICE_ATTR(pwm3_auto_point3_pwm, S_IRUGO | S_IWUSR,
 969                           show_pwm, store_pwm, 0xA7);
 970 static SENSOR_DEVICE_ATTR(pwm3_auto_point4_pwm, S_IRUGO | S_IWUSR,
 971                           show_pwm, store_pwm, 0xA8);
 972 static SENSOR_DEVICE_ATTR(pwm3_auto_point5_pwm, S_IRUGO, show_pwm, NULL, 0);
 973
 974 static struct attribute *nct7802_auto_point_attrs[] = {
 975         &sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
 976         &sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
 977         &sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr,
 978         &sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr,
 979         &sensor_dev_attr_pwm1_auto_point5_temp.dev_attr.attr,
 980
 981         &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
 982         &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
 983         &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
 984         &sensor_dev_attr_pwm1_auto_point4_pwm.dev_attr.attr,
 985         &sensor_dev_attr_pwm1_auto_point5_pwm.dev_attr.attr,
 986
 987         &sensor_dev_attr_pwm2_auto_point1_temp.dev_attr.attr,
 988         &sensor_dev_attr_pwm2_auto_point2_temp.dev_attr.attr,
 989         &sensor_dev_attr_pwm2_auto_point3_temp.dev_attr.attr,
 990         &sensor_dev_attr_pwm2_auto_point4_temp.dev_attr.attr,
 991         &sensor_dev_attr_pwm2_auto_point5_temp.dev_attr.attr,
 992
 993         &sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr,
 994         &sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr,
 995         &sensor_dev_attr_pwm2_auto_point3_pwm.dev_attr.attr,
 996         &sensor_dev_attr_pwm2_auto_point4_pwm.dev_attr.attr,
 997         &sensor_dev_attr_pwm2_auto_point5_pwm.dev_attr.attr,
 998
 999         &sensor_dev_attr_pwm3_auto_point1_temp.dev_attr.attr,
1000         &sensor_dev_attr_pwm3_auto_point2_temp.dev_attr.attr,
1001         &sensor_dev_attr_pwm3_auto_point3_temp.dev_attr.attr,
1002         &sensor_dev_attr_pwm3_auto_point4_temp.dev_attr.attr,
1003         &sensor_dev_attr_pwm3_auto_point5_temp.dev_attr.attr,
1004
1005         &sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr,
1006         &sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr,
1007         &sensor_dev_attr_pwm3_auto_point3_pwm.dev_attr.attr,
1008         &sensor_dev_attr_pwm3_auto_point4_pwm.dev_attr.attr,
1009         &sensor_dev_attr_pwm3_auto_point5_pwm.dev_attr.attr,
1010
1011         NULL
1012 };
1013
1014 static const struct attribute_group nct7802_auto_point_group = {
1015         .attrs = nct7802_auto_point_attrs,
1016 };
1017
1018 static const struct attribute_group *nct7802_groups[] = {
1019         &nct7802_temp_group,
1020         &nct7802_in_group,
1021         &nct7802_fan_group,
1022         &nct7802_pwm_group,
1023         &nct7802_auto_point_group,
1024         NULL
1025 };
1026
1027 static int nct7802_detect(struct i2c_client *client,
1028                           struct i2c_board_info *info)
1029 {
1030         int reg;
1031
1032         /*
1033          * Chip identification registers are only available in bank 0,
1034          * so only attempt chip detection if bank 0 is selected
1035          */
1036         reg = i2c_smbus_read_byte_data(client, REG_BANK);
1037         if (reg != 0x00)
1038                 return -ENODEV;
1039
1040         reg = i2c_smbus_read_byte_data(client, REG_VENDOR_ID);
1041         if (reg != 0x50)
1042                 return -ENODEV;
1043
1044         reg = i2c_smbus_read_byte_data(client, REG_CHIP_ID);
1045         if (reg != 0xc3)
1046                 return -ENODEV;
1047
1048         reg = i2c_smbus_read_byte_data(client, REG_VERSION_ID);
1049         if (reg < 0 || (reg & 0xf0) != 0x20)
1050                 return -ENODEV;
1051
1052         /* Also validate lower bits of voltage and temperature registers */
1053         reg = i2c_smbus_read_byte_data(client, REG_TEMP_LSB);
1054         if (reg < 0 || (reg & 0x1f))
1055                 return -ENODEV;
1056
1057         reg = i2c_smbus_read_byte_data(client, REG_TEMP_PECI_LSB);
1058         if (reg < 0 || (reg & 0x3f))
1059                 return -ENODEV;
1060
1061         reg = i2c_smbus_read_byte_data(client, REG_VOLTAGE_LOW);
1062         if (reg < 0 || (reg & 0x3f))
1063                 return -ENODEV;
1064
1065         strlcpy(info->type, "nct7802", I2C_NAME_SIZE);
1066         return 0;
1067 }
1068
1069 static bool nct7802_regmap_is_volatile(struct device *dev, unsigned int reg)
1070 {
1071         return (reg != REG_BANK && reg <= 0x20) ||
1072                 (reg >= REG_PWM(0) && reg <= REG_PWM(2));
1073 }
1074
1075 static const struct regmap_config nct7802_regmap_config = {
1076         .reg_bits = 8,
1077         .val_bits = 8,
1078         .cache_type = REGCACHE_RBTREE,
1079         .volatile_reg = nct7802_regmap_is_volatile,
1080 };
1081
1082 static int nct7802_init_chip(struct nct7802_data *data)
1083 {
1084         int err;
1085
1086         /* Enable ADC */
1087         err = regmap_update_bits(data->regmap, REG_START, 0x01, 0x01);
1088         if (err)
1089                 return err;
1090
1091         /* Enable local temperature sensor */
1092         err = regmap_update_bits(data->regmap, REG_MODE, 0x40, 0x40);
1093         if (err)
1094                 return err;
1095
1096         /* Enable Vcore and VCC voltage monitoring */
1097         return regmap_update_bits(data->regmap, REG_VMON_ENABLE, 0x03, 0x03);
1098 }
1099
1100 static int nct7802_probe(struct i2c_client *client,
1101                          const struct i2c_device_id *id)
1102 {
1103         struct device *dev = &client->dev;
1104         struct nct7802_data *data;
1105         struct device *hwmon_dev;
1106         int ret;
1107
1108         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
1109         if (data == NULL)
1110                 return -ENOMEM;
1111
1112         data->regmap = devm_regmap_init_i2c(client, &nct7802_regmap_config);
1113         if (IS_ERR(data->regmap))
1114                 return PTR_ERR(data->regmap);
1115
1116         mutex_init(&data->access_lock);
1117
1118         ret = nct7802_init_chip(data);
1119         if (ret < 0)
1120                 return ret;
1121
1122         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
1123                                                            data,
1124                                                            nct7802_groups);
1125         return PTR_ERR_OR_ZERO(hwmon_dev);
1126 }
1127
1128 static const unsigned short nct7802_address_list[] = {
1129         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END
1130 };
1131
1132 static const struct i2c_device_id nct7802_idtable[] = {
1133         { "nct7802", 0 },
1134         { }
1135 };
1136 MODULE_DEVICE_TABLE(i2c, nct7802_idtable);
1137
1138 static struct i2c_driver nct7802_driver = {
1139         .class = I2C_CLASS_HWMON,
1140         .driver = {
1141                 .name = DRVNAME,
1142         },
1143         .detect = nct7802_detect,
1144         .probe = nct7802_probe,
1145         .id_table = nct7802_idtable,
1146         .address_list = nct7802_address_list,
1147 };
1148
1149 module_i2c_driver(nct7802_driver);
1150
1151 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
1152 MODULE_DESCRIPTION("NCT7802Y Hardware Monitoring Driver");
1153 MODULE_LICENSE("GPL v2");