linux/drivers/hwmon/nct7802.c
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   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
  32static const u8 REG_VOLTAGE[5] = { 0x09, 0x0a, 0x0c, 0x0d, 0x0e };
  33
  34static const u8 REG_VOLTAGE_LIMIT_LSB[2][5] = {
  35        { 0x40, 0x00, 0x42, 0x44, 0x46 },
  36        { 0x3f, 0x00, 0x41, 0x43, 0x45 },
  37};
  38
  39static const u8 REG_VOLTAGE_LIMIT_MSB[5] = { 0x48, 0x00, 0x47, 0x47, 0x48 };
  40
  41static 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
  67struct nct7802_data {
  68        struct regmap *regmap;
  69        struct mutex access_lock; /* for multi-byte read and write operations */
  70};
  71
  72static 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
  87static 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
 108static 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
 126static 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
 144static 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
 160static 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
 175static 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
 195static 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;
 215abort:
 216        mutex_unlock(&data->access_lock);
 217        return err;
 218}
 219
 220static 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);
 238abort:
 239        mutex_unlock(&data->access_lock);
 240        return ret;
 241}
 242
 243static 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;
 264abort:
 265        mutex_unlock(&data->access_lock);
 266        return ret;
 267}
 268
 269static 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);
 286abort:
 287        mutex_unlock(&data->access_lock);
 288        return err;
 289}
 290
 291static u8 nct7802_vmul[] = { 4, 2, 2, 2, 2 };
 292
 293static 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        }
 320abort:
 321        mutex_unlock(&data->access_lock);
 322        return ret;
 323}
 324
 325static 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);
 343abort:
 344        mutex_unlock(&data->access_lock);
 345        return err;
 346}
 347
 348static 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
 362static 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
 380static 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
 394static 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
 413static 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
 427static 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
 441static 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
 457static 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
 473static ssize_t
 474show_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
 488static ssize_t
 489store_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
 508static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO | S_IWUSR,
 509                          show_temp_type, store_temp_type, 0);
 510static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0x01,
 511                            REG_TEMP_LSB);
 512static SENSOR_DEVICE_ATTR_2(temp1_min, S_IRUGO | S_IWUSR, show_temp,
 513                            store_temp, 0x31, 0);
 514static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp,
 515                            store_temp, 0x30, 0);
 516static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IRUGO | S_IWUSR, show_temp,
 517                            store_temp, 0x3a, 0);
 518
 519static SENSOR_DEVICE_ATTR(temp2_type, S_IRUGO | S_IWUSR,
 520                          show_temp_type, store_temp_type, 1);
 521static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0x02,
 522                            REG_TEMP_LSB);
 523static SENSOR_DEVICE_ATTR_2(temp2_min, S_IRUGO | S_IWUSR, show_temp,
 524                            store_temp, 0x33, 0);
 525static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp,
 526                            store_temp, 0x32, 0);
 527static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IRUGO | S_IWUSR, show_temp,
 528                            store_temp, 0x3b, 0);
 529
 530static SENSOR_DEVICE_ATTR(temp3_type, S_IRUGO | S_IWUSR,
 531                          show_temp_type, store_temp_type, 2);
 532static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 0x03,
 533                            REG_TEMP_LSB);
 534static SENSOR_DEVICE_ATTR_2(temp3_min, S_IRUGO | S_IWUSR, show_temp,
 535                            store_temp, 0x35, 0);
 536static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp,
 537                            store_temp, 0x34, 0);
 538static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IRUGO | S_IWUSR, show_temp,
 539                            store_temp, 0x3c, 0);
 540
 541static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 0x04, 0);
 542static SENSOR_DEVICE_ATTR_2(temp4_min, S_IRUGO | S_IWUSR, show_temp,
 543                            store_temp, 0x37, 0);
 544static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp,
 545                            store_temp, 0x36, 0);
 546static SENSOR_DEVICE_ATTR_2(temp4_crit, S_IRUGO | S_IWUSR, show_temp,
 547                            store_temp, 0x3d, 0);
 548
 549static SENSOR_DEVICE_ATTR_2(temp5_input, S_IRUGO, show_temp, NULL, 0x06,
 550                            REG_TEMP_PECI_LSB);
 551static SENSOR_DEVICE_ATTR_2(temp5_min, S_IRUGO | S_IWUSR, show_temp,
 552                            store_temp, 0x39, 0);
 553static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp,
 554                            store_temp, 0x38, 0);
 555static SENSOR_DEVICE_ATTR_2(temp5_crit, S_IRUGO | S_IWUSR, show_temp,
 556                            store_temp, 0x3e, 0);
 557
 558static SENSOR_DEVICE_ATTR_2(temp6_input, S_IRUGO, show_temp, NULL, 0x07,
 559                            REG_TEMP_PECI_LSB);
 560
 561static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
 562                            0x18, 0);
 563static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, show_alarm, NULL,
 564                            0x18, 1);
 565static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, show_alarm, NULL,
 566                            0x18, 2);
 567static SENSOR_DEVICE_ATTR_2(temp4_min_alarm, S_IRUGO, show_alarm, NULL,
 568                            0x18, 3);
 569static SENSOR_DEVICE_ATTR_2(temp5_min_alarm, S_IRUGO, show_alarm, NULL,
 570                            0x18, 4);
 571
 572static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
 573                            0x19, 0);
 574static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, show_alarm, NULL,
 575                            0x19, 1);
 576static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, show_alarm, NULL,
 577                            0x19, 2);
 578static SENSOR_DEVICE_ATTR_2(temp4_max_alarm, S_IRUGO, show_alarm, NULL,
 579                            0x19, 3);
 580static SENSOR_DEVICE_ATTR_2(temp5_max_alarm, S_IRUGO, show_alarm, NULL,
 581                            0x19, 4);
 582
 583static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
 584                            0x1b, 0);
 585static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, show_alarm, NULL,
 586                            0x1b, 1);
 587static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, show_alarm, NULL,
 588                            0x1b, 2);
 589static SENSOR_DEVICE_ATTR_2(temp4_crit_alarm, S_IRUGO, show_alarm, NULL,
 590                            0x1b, 3);
 591static SENSOR_DEVICE_ATTR_2(temp5_crit_alarm, S_IRUGO, show_alarm, NULL,
 592                            0x1b, 4);
 593
 594static SENSOR_DEVICE_ATTR_2(temp1_fault, S_IRUGO, show_alarm, NULL, 0x17, 0);
 595static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_alarm, NULL, 0x17, 1);
 596static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_alarm, NULL, 0x17, 2);
 597
 598static SENSOR_DEVICE_ATTR_2(temp1_beep, S_IRUGO | S_IWUSR, show_beep,
 599                            store_beep, 0x5c, 0);
 600static SENSOR_DEVICE_ATTR_2(temp2_beep, S_IRUGO | S_IWUSR, show_beep,
 601                            store_beep, 0x5c, 1);
 602static SENSOR_DEVICE_ATTR_2(temp3_beep, S_IRUGO | S_IWUSR, show_beep,
 603                            store_beep, 0x5c, 2);
 604static SENSOR_DEVICE_ATTR_2(temp4_beep, S_IRUGO | S_IWUSR, show_beep,
 605                            store_beep, 0x5c, 3);
 606static SENSOR_DEVICE_ATTR_2(temp5_beep, S_IRUGO | S_IWUSR, show_beep,
 607                            store_beep, 0x5c, 4);
 608static SENSOR_DEVICE_ATTR_2(temp6_beep, S_IRUGO | S_IWUSR, show_beep,
 609                            store_beep, 0x5c, 5);
 610
 611static 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
 669static 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
 707static const struct attribute_group nct7802_temp_group = {
 708        .attrs = nct7802_temp_attrs,
 709        .is_visible = nct7802_temp_is_visible,
 710};
 711
 712static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO, show_in, NULL, 0, 0);
 713static SENSOR_DEVICE_ATTR_2(in0_min, S_IRUGO | S_IWUSR, show_in, store_in,
 714                            0, 1);
 715static SENSOR_DEVICE_ATTR_2(in0_max, S_IRUGO | S_IWUSR, show_in, store_in,
 716                            0, 2);
 717static SENSOR_DEVICE_ATTR_2(in0_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 3);
 718static SENSOR_DEVICE_ATTR_2(in0_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 719                            0x5a, 3);
 720
 721static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO, show_in, NULL, 1, 0);
 722
 723static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO, show_in, NULL, 2, 0);
 724static SENSOR_DEVICE_ATTR_2(in2_min, S_IRUGO | S_IWUSR, show_in, store_in,
 725                            2, 1);
 726static SENSOR_DEVICE_ATTR_2(in2_max, S_IRUGO | S_IWUSR, show_in, store_in,
 727                            2, 2);
 728static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 0);
 729static SENSOR_DEVICE_ATTR_2(in2_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 730                            0x5a, 0);
 731
 732static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO, show_in, NULL, 3, 0);
 733static SENSOR_DEVICE_ATTR_2(in3_min, S_IRUGO | S_IWUSR, show_in, store_in,
 734                            3, 1);
 735static SENSOR_DEVICE_ATTR_2(in3_max, S_IRUGO | S_IWUSR, show_in, store_in,
 736                            3, 2);
 737static SENSOR_DEVICE_ATTR_2(in3_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 1);
 738static SENSOR_DEVICE_ATTR_2(in3_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 739                            0x5a, 1);
 740
 741static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO, show_in, NULL, 4, 0);
 742static SENSOR_DEVICE_ATTR_2(in4_min, S_IRUGO | S_IWUSR, show_in, store_in,
 743                            4, 1);
 744static SENSOR_DEVICE_ATTR_2(in4_max, S_IRUGO | S_IWUSR, show_in, store_in,
 745                            4, 2);
 746static SENSOR_DEVICE_ATTR_2(in4_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 2);
 747static SENSOR_DEVICE_ATTR_2(in4_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 748                            0x5a, 2);
 749
 750static 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
 780static 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
 805static const struct attribute_group nct7802_in_group = {
 806        .attrs = nct7802_in_attrs,
 807        .is_visible = nct7802_in_is_visible,
 808};
 809
 810static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0x10);
 811static SENSOR_DEVICE_ATTR_2(fan1_min, S_IRUGO | S_IWUSR, show_fan_min,
 812                            store_fan_min, 0x49, 0x4c);
 813static SENSOR_DEVICE_ATTR_2(fan1_alarm, S_IRUGO, show_alarm, NULL, 0x1a, 0);
 814static SENSOR_DEVICE_ATTR_2(fan1_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 815                            0x5b, 0);
 816static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 0x11);
 817static SENSOR_DEVICE_ATTR_2(fan2_min, S_IRUGO | S_IWUSR, show_fan_min,
 818                            store_fan_min, 0x4a, 0x4d);
 819static SENSOR_DEVICE_ATTR_2(fan2_alarm, S_IRUGO, show_alarm, NULL, 0x1a, 1);
 820static SENSOR_DEVICE_ATTR_2(fan2_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 821                            0x5b, 1);
 822static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 0x12);
 823static SENSOR_DEVICE_ATTR_2(fan3_min, S_IRUGO | S_IWUSR, show_fan_min,
 824                            store_fan_min, 0x4b, 0x4e);
 825static SENSOR_DEVICE_ATTR_2(fan3_alarm, S_IRUGO, show_alarm, NULL, 0x1a, 2);
 826static 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 */
 830static SENSOR_DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL, 0);
 831static SENSOR_DEVICE_ATTR(pwm2_mode, S_IRUGO, show_pwm_mode, NULL, 1);
 832static SENSOR_DEVICE_ATTR(pwm3_mode, S_IRUGO, show_pwm_mode, NULL, 2);
 833
 834/* 7.2.91... Fan Control Output Value */
 835static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, store_pwm,
 836                          REG_PWM(0));
 837static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, show_pwm, store_pwm,
 838                          REG_PWM(1));
 839static 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 */
 843static SENSOR_DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, show_pwm_enable,
 844                          store_pwm_enable, 0);
 845static SENSOR_DEVICE_ATTR(pwm2_enable, S_IRUGO | S_IWUSR, show_pwm_enable,
 846                          store_pwm_enable, 1);
 847static SENSOR_DEVICE_ATTR(pwm3_enable, S_IRUGO | S_IWUSR, show_pwm_enable,
 848                          store_pwm_enable, 2);
 849
 850static 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
 867static 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
 883static const struct attribute_group nct7802_fan_group = {
 884        .attrs = nct7802_fan_attrs,
 885        .is_visible = nct7802_fan_is_visible,
 886};
 887
 888static 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
 901static 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 */
 906static SENSOR_DEVICE_ATTR_2(pwm1_auto_point1_temp, S_IRUGO | S_IWUSR,
 907                            show_temp, store_temp, 0x80, 0);
 908static SENSOR_DEVICE_ATTR_2(pwm1_auto_point2_temp, S_IRUGO | S_IWUSR,
 909                            show_temp, store_temp, 0x81, 0);
 910static SENSOR_DEVICE_ATTR_2(pwm1_auto_point3_temp, S_IRUGO | S_IWUSR,
 911                            show_temp, store_temp, 0x82, 0);
 912static SENSOR_DEVICE_ATTR_2(pwm1_auto_point4_temp, S_IRUGO | S_IWUSR,
 913                            show_temp, store_temp, 0x83, 0);
 914static 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 */
 918static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IRUGO | S_IWUSR,
 919                          show_pwm, store_pwm, 0x85);
 920static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IRUGO | S_IWUSR,
 921                          show_pwm, store_pwm, 0x86);
 922static SENSOR_DEVICE_ATTR(pwm1_auto_point3_pwm, S_IRUGO | S_IWUSR,
 923                          show_pwm, store_pwm, 0x87);
 924static SENSOR_DEVICE_ATTR(pwm1_auto_point4_pwm, S_IRUGO | S_IWUSR,
 925                          show_pwm, store_pwm, 0x88);
 926static 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 */
 929static SENSOR_DEVICE_ATTR_2(pwm2_auto_point1_temp, S_IRUGO | S_IWUSR,
 930                            show_temp, store_temp, 0x90, 0);
 931static SENSOR_DEVICE_ATTR_2(pwm2_auto_point2_temp, S_IRUGO | S_IWUSR,
 932                            show_temp, store_temp, 0x91, 0);
 933static SENSOR_DEVICE_ATTR_2(pwm2_auto_point3_temp, S_IRUGO | S_IWUSR,
 934                            show_temp, store_temp, 0x92, 0);
 935static SENSOR_DEVICE_ATTR_2(pwm2_auto_point4_temp, S_IRUGO | S_IWUSR,
 936                            show_temp, store_temp, 0x93, 0);
 937static 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 */
 941static SENSOR_DEVICE_ATTR(pwm2_auto_point1_pwm, S_IRUGO | S_IWUSR,
 942                          show_pwm, store_pwm, 0x95);
 943static SENSOR_DEVICE_ATTR(pwm2_auto_point2_pwm, S_IRUGO | S_IWUSR,
 944                          show_pwm, store_pwm, 0x96);
 945static SENSOR_DEVICE_ATTR(pwm2_auto_point3_pwm, S_IRUGO | S_IWUSR,
 946                          show_pwm, store_pwm, 0x97);
 947static SENSOR_DEVICE_ATTR(pwm2_auto_point4_pwm, S_IRUGO | S_IWUSR,
 948                          show_pwm, store_pwm, 0x98);
 949static 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 */
 952static SENSOR_DEVICE_ATTR_2(pwm3_auto_point1_temp, S_IRUGO | S_IWUSR,
 953                            show_temp, store_temp, 0xA0, 0);
 954static SENSOR_DEVICE_ATTR_2(pwm3_auto_point2_temp, S_IRUGO | S_IWUSR,
 955                            show_temp, store_temp, 0xA1, 0);
 956static SENSOR_DEVICE_ATTR_2(pwm3_auto_point3_temp, S_IRUGO | S_IWUSR,
 957                            show_temp, store_temp, 0xA2, 0);
 958static SENSOR_DEVICE_ATTR_2(pwm3_auto_point4_temp, S_IRUGO | S_IWUSR,
 959                            show_temp, store_temp, 0xA3, 0);
 960static 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 */
 964static SENSOR_DEVICE_ATTR(pwm3_auto_point1_pwm, S_IRUGO | S_IWUSR,
 965                          show_pwm, store_pwm, 0xA5);
 966static SENSOR_DEVICE_ATTR(pwm3_auto_point2_pwm, S_IRUGO | S_IWUSR,
 967                          show_pwm, store_pwm, 0xA6);
 968static SENSOR_DEVICE_ATTR(pwm3_auto_point3_pwm, S_IRUGO | S_IWUSR,
 969                          show_pwm, store_pwm, 0xA7);
 970static SENSOR_DEVICE_ATTR(pwm3_auto_point4_pwm, S_IRUGO | S_IWUSR,
 971                          show_pwm, store_pwm, 0xA8);
 972static SENSOR_DEVICE_ATTR(pwm3_auto_point5_pwm, S_IRUGO, show_pwm, NULL, 0);
 973
 974static 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
1014static const struct attribute_group nct7802_auto_point_group = {
1015        .attrs = nct7802_auto_point_attrs,
1016};
1017
1018static 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
1027static 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
1069static 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
1075static 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
1082static 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
1100static 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
1128static const unsigned short nct7802_address_list[] = {
1129        0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END
1130};
1131
1132static const struct i2c_device_id nct7802_idtable[] = {
1133        { "nct7802", 0 },
1134        { }
1135};
1136MODULE_DEVICE_TABLE(i2c, nct7802_idtable);
1137
1138static 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
1149module_i2c_driver(nct7802_driver);
1150
1151MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
1152MODULE_DESCRIPTION("NCT7802Y Hardware Monitoring Driver");
1153MODULE_LICENSE("GPL v2");
1154