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