drivers/hwmon/nct7802.c

   1 /*
   2  * nct7802 - Driver for Nuvoton NCT7802Y
   3  *
   4  * Copyright (C) 2014  Guenter Roeck <linux@roeck-us.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  18
  19 #include <linux/err.h>
  20 #include <linux/i2c.h>
  21 #include <linux/init.h>
  22 #include <linux/hwmon.h>
  23 #include <linux/hwmon-sysfs.h>
  24 #include <linux/jiffies.h>
  25 #include <linux/module.h>
  26 #include <linux/mutex.h>
  27 #include <linux/regmap.h>
  28 #include <linux/slab.h>
  29
  30 #define DRVNAME "nct7802"
  31
  32 static const u8 REG_VOLTAGE[5] = { 0x09, 0x0a, 0x0c, 0x0d, 0x0e };
  33
  34 static const u8 REG_VOLTAGE_LIMIT_LSB[2][5] = {
  35         { 0x40, 0x00, 0x42, 0x44, 0x46 },
  36         { 0x3f, 0x00, 0x41, 0x43, 0x45 },
  37 };
  38
  39 static const u8 REG_VOLTAGE_LIMIT_MSB[5] = { 0x48, 0x00, 0x47, 0x47, 0x48 };
  40
  41 static const u8 REG_VOLTAGE_LIMIT_MSB_SHIFT[2][5] = {
  42         { 0, 0, 4, 0, 4 },
  43         { 2, 0, 6, 2, 6 },
  44 };
  45
  46 #define REG_BANK                0x00
  47 #define REG_TEMP_LSB            0x05
  48 #define REG_TEMP_PECI_LSB       0x08
  49 #define REG_VOLTAGE_LOW         0x0f
  50 #define REG_FANCOUNT_LOW        0x13
  51 #define REG_START               0x21
  52 #define REG_MODE                0x22
  53 #define REG_PECI_ENABLE         0x23
  54 #define REG_FAN_ENABLE          0x24
  55 #define REG_VMON_ENABLE         0x25
  56 #define REG_VENDOR_ID           0xfd
  57 #define REG_CHIP_ID             0xfe
  58 #define REG_VERSION_ID          0xff
  59
  60 /*
  61  * Data structures and manipulation thereof
  62  */
  63
  64 struct nct7802_data {
  65         struct regmap *regmap;
  66         struct mutex access_lock; /* for multi-byte read and write operations */
  67 };
  68
  69 static int nct7802_read_temp(struct nct7802_data *data,
  70                              u8 reg_temp, u8 reg_temp_low, int *temp)
  71 {
  72         unsigned int t1, t2 = 0;
  73         int err;
  74
  75         *temp = 0;
  76
  77         mutex_lock(&data->access_lock);
  78         err = regmap_read(data->regmap, reg_temp, &t1);
  79         if (err < 0)
  80                 goto abort;
  81         t1 <<= 8;
  82         if (reg_temp_low) {     /* 11 bit data */
  83                 err = regmap_read(data->regmap, reg_temp_low, &t2);
  84                 if (err < 0)
  85                         goto abort;
  86         }
  87         t1 |= t2 & 0xe0;
  88         *temp = (s16)t1 / 32 * 125;
  89 abort:
  90         mutex_unlock(&data->access_lock);
  91         return err;
  92 }
  93
  94 static int nct7802_read_fan(struct nct7802_data *data, u8 reg_fan)
  95 {
  96         unsigned int f1, f2;
  97         int ret;
  98
  99         mutex_lock(&data->access_lock);
 100         ret = regmap_read(data->regmap, reg_fan, &f1);
 101         if (ret < 0)
 102                 goto abort;
 103         ret = regmap_read(data->regmap, REG_FANCOUNT_LOW, &f2);
 104         if (ret < 0)
 105                 goto abort;
 106         ret = (f1 << 5) | (f2 >> 3);
 107         /* convert fan count to rpm */
 108         if (ret == 0x1fff)      /* maximum value, assume fan is stopped */
 109                 ret = 0;
 110         else if (ret)
 111                 ret = DIV_ROUND_CLOSEST(1350000U, ret);
 112 abort:
 113         mutex_unlock(&data->access_lock);
 114         return ret;
 115 }
 116
 117 static int nct7802_read_fan_min(struct nct7802_data *data, u8 reg_fan_low,
 118                                 u8 reg_fan_high)
 119 {
 120         unsigned int f1, f2;
 121         int ret;
 122
 123         mutex_lock(&data->access_lock);
 124         ret = regmap_read(data->regmap, reg_fan_low, &f1);
 125         if (ret < 0)
 126                 goto abort;
 127         ret = regmap_read(data->regmap, reg_fan_high, &f2);
 128         if (ret < 0)
 129                 goto abort;
 130         ret = f1 | ((f2 & 0xf8) << 5);
 131         /* convert fan count to rpm */
 132         if (ret == 0x1fff)      /* maximum value, assume no limit */
 133                 ret = 0;
 134         else if (ret)
 135                 ret = DIV_ROUND_CLOSEST(1350000U, ret);
 136 abort:
 137         mutex_unlock(&data->access_lock);
 138         return ret;
 139 }
 140
 141 static int nct7802_write_fan_min(struct nct7802_data *data, u8 reg_fan_low,
 142                                  u8 reg_fan_high, unsigned int limit)
 143 {
 144         int err;
 145
 146         if (limit)
 147                 limit = DIV_ROUND_CLOSEST(1350000U, limit);
 148         else
 149                 limit = 0x1fff;
 150         limit = clamp_val(limit, 0, 0x1fff);
 151
 152         mutex_lock(&data->access_lock);
 153         err = regmap_write(data->regmap, reg_fan_low, limit & 0xff);
 154         if (err < 0)
 155                 goto abort;
 156
 157         err = regmap_write(data->regmap, reg_fan_high, (limit & 0x1f00) >> 5);
 158 abort:
 159         mutex_unlock(&data->access_lock);
 160         return err;
 161 }
 162
 163 static u8 nct7802_vmul[] = { 4, 2, 2, 2, 2 };
 164
 165 static int nct7802_read_voltage(struct nct7802_data *data, int nr, int index)
 166 {
 167         unsigned int v1, v2;
 168         int ret;
 169
 170         mutex_lock(&data->access_lock);
 171         if (index == 0) {       /* voltage */
 172                 ret = regmap_read(data->regmap, REG_VOLTAGE[nr], &v1);
 173                 if (ret < 0)
 174                         goto abort;
 175                 ret = regmap_read(data->regmap, REG_VOLTAGE_LOW, &v2);
 176                 if (ret < 0)
 177                         goto abort;
 178                 ret = ((v1 << 2) | (v2 >> 6)) * nct7802_vmul[nr];
 179         }  else {       /* limit */
 180                 int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr];
 181
 182                 ret = regmap_read(data->regmap,
 183                                   REG_VOLTAGE_LIMIT_LSB[index - 1][nr], &v1);
 184                 if (ret < 0)
 185                         goto abort;
 186                 ret = regmap_read(data->regmap, REG_VOLTAGE_LIMIT_MSB[nr],
 187                                   &v2);
 188                 if (ret < 0)
 189                         goto abort;
 190                 ret = (v1 | ((v2 << shift) & 0x300)) * nct7802_vmul[nr];
 191         }
 192 abort:
 193         mutex_unlock(&data->access_lock);
 194         return ret;
 195 }
 196
 197 static int nct7802_write_voltage(struct nct7802_data *data, int nr, int index,
 198                                  unsigned int voltage)
 199 {
 200         int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr];
 201         int err;
 202
 203         voltage = DIV_ROUND_CLOSEST(voltage, nct7802_vmul[nr]);
 204         voltage = clamp_val(voltage, 0, 0x3ff);
 205
 206         mutex_lock(&data->access_lock);
 207         err = regmap_write(data->regmap,
 208                            REG_VOLTAGE_LIMIT_LSB[index - 1][nr],
 209                            voltage & 0xff);
 210         if (err < 0)
 211                 goto abort;
 212
 213         err = regmap_update_bits(data->regmap, REG_VOLTAGE_LIMIT_MSB[nr],
 214                                  0x0300 >> shift, (voltage & 0x0300) >> shift);
 215 abort:
 216         mutex_unlock(&data->access_lock);
 217         return err;
 218 }
 219
 220 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
 221                        char *buf)
 222 {
 223         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 224         struct nct7802_data *data = dev_get_drvdata(dev);
 225         int voltage;
 226
 227         voltage = nct7802_read_voltage(data, sattr->nr, sattr->index);
 228         if (voltage < 0)
 229                 return voltage;
 230
 231         return sprintf(buf, "%d\n", voltage);
 232 }
 233
 234 static ssize_t store_in(struct device *dev, struct device_attribute *attr,
 235                         const char *buf, size_t count)
 236 {
 237         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 238         struct nct7802_data *data = dev_get_drvdata(dev);
 239         int index = sattr->index;
 240         int nr = sattr->nr;
 241         unsigned long val;
 242         int err;
 243
 244         err = kstrtoul(buf, 10, &val);
 245         if (err < 0)
 246                 return err;
 247
 248         err = nct7802_write_voltage(data, nr, index, val);
 249         return err ? : count;
 250 }
 251
 252 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
 253                          char *buf)
 254 {
 255         struct nct7802_data *data = dev_get_drvdata(dev);
 256         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 257         int err, temp;
 258
 259         err = nct7802_read_temp(data, sattr->nr, sattr->index, &temp);
 260         if (err < 0)
 261                 return err;
 262
 263         return sprintf(buf, "%d\n", temp);
 264 }
 265
 266 static ssize_t store_temp(struct device *dev, struct device_attribute *attr,
 267                           const char *buf, size_t count)
 268 {
 269         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 270         struct nct7802_data *data = dev_get_drvdata(dev);
 271         int nr = sattr->nr;
 272         long val;
 273         int err;
 274
 275         err = kstrtol(buf, 10, &val);
 276         if (err < 0)
 277                 return err;
 278
 279         val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);
 280
 281         err = regmap_write(data->regmap, nr, val & 0xff);
 282         return err ? : count;
 283 }
 284
 285 static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
 286                         char *buf)
 287 {
 288         struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
 289         struct nct7802_data *data = dev_get_drvdata(dev);
 290         int speed;
 291
 292         speed = nct7802_read_fan(data, sattr->index);
 293         if (speed < 0)
 294                 return speed;
 295
 296         return sprintf(buf, "%d\n", speed);
 297 }
 298
 299 static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
 300                             char *buf)
 301 {
 302         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 303         struct nct7802_data *data = dev_get_drvdata(dev);
 304         int speed;
 305
 306         speed = nct7802_read_fan_min(data, sattr->nr, sattr->index);
 307         if (speed < 0)
 308                 return speed;
 309
 310         return sprintf(buf, "%d\n", speed);
 311 }
 312
 313 static ssize_t store_fan_min(struct device *dev, struct device_attribute *attr,
 314                              const char *buf, size_t count)
 315 {
 316         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 317         struct nct7802_data *data = dev_get_drvdata(dev);
 318         unsigned long val;
 319         int err;
 320
 321         err = kstrtoul(buf, 10, &val);
 322         if (err < 0)
 323                 return err;
 324
 325         err = nct7802_write_fan_min(data, sattr->nr, sattr->index, val);
 326         return err ? : count;
 327 }
 328
 329 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 330                           char *buf)
 331 {
 332         struct nct7802_data *data = dev_get_drvdata(dev);
 333         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 334         int bit = sattr->index;
 335         unsigned int val;
 336         int ret;
 337
 338         ret = regmap_read(data->regmap, sattr->nr, &val);
 339         if (ret < 0)
 340                 return ret;
 341
 342         return sprintf(buf, "%u\n", !!(val & (1 << bit)));
 343 }
 344
 345 static ssize_t
 346 show_beep(struct device *dev, struct device_attribute *attr, char *buf)
 347 {
 348         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 349         struct nct7802_data *data = dev_get_drvdata(dev);
 350         unsigned int regval;
 351         int err;
 352
 353         err = regmap_read(data->regmap, sattr->nr, &regval);
 354         if (err)
 355                 return err;
 356
 357         return sprintf(buf, "%u\n", !!(regval & (1 << sattr->index)));
 358 }
 359
 360 static ssize_t
 361 store_beep(struct device *dev, struct device_attribute *attr, const char *buf,
 362            size_t count)
 363 {
 364         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 365         struct nct7802_data *data = dev_get_drvdata(dev);
 366         unsigned long val;
 367         int err;
 368
 369         err = kstrtoul(buf, 10, &val);
 370         if (err < 0)
 371                 return err;
 372         if (val > 1)
 373                 return -EINVAL;
 374
 375         err = regmap_update_bits(data->regmap, sattr->nr, 1 << sattr->index,
 376                                  val ? 1 << sattr->index : 0);
 377         return err ? : count;
 378 }
 379
 380 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0x01,
 381                             REG_TEMP_LSB);
 382 static SENSOR_DEVICE_ATTR_2(temp1_min, S_IRUGO | S_IWUSR, show_temp,
 383                             store_temp, 0x31, 0);
 384 static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp,
 385                             store_temp, 0x30, 0);
 386 static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IRUGO | S_IWUSR, show_temp,
 387                             store_temp, 0x3a, 0);
 388
 389 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0x02,
 390                             REG_TEMP_LSB);
 391 static SENSOR_DEVICE_ATTR_2(temp2_min, S_IRUGO | S_IWUSR, show_temp,
 392                             store_temp, 0x33, 0);
 393 static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp,
 394                             store_temp, 0x32, 0);
 395 static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IRUGO | S_IWUSR, show_temp,
 396                             store_temp, 0x3b, 0);
 397
 398 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 0x03,
 399                             REG_TEMP_LSB);
 400 static SENSOR_DEVICE_ATTR_2(temp3_min, S_IRUGO | S_IWUSR, show_temp,
 401                             store_temp, 0x35, 0);
 402 static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp,
 403                             store_temp, 0x34, 0);
 404 static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IRUGO | S_IWUSR, show_temp,
 405                             store_temp, 0x3c, 0);
 406
 407 static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 0x04, 0);
 408 static SENSOR_DEVICE_ATTR_2(temp4_min, S_IRUGO | S_IWUSR, show_temp,
 409                             store_temp, 0x37, 0);
 410 static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp,
 411                             store_temp, 0x36, 0);
 412 static SENSOR_DEVICE_ATTR_2(temp4_crit, S_IRUGO | S_IWUSR, show_temp,
 413                             store_temp, 0x3d, 0);
 414
 415 static SENSOR_DEVICE_ATTR_2(temp5_input, S_IRUGO, show_temp, NULL, 0x06,
 416                             REG_TEMP_PECI_LSB);
 417 static SENSOR_DEVICE_ATTR_2(temp5_min, S_IRUGO | S_IWUSR, show_temp,
 418                             store_temp, 0x39, 0);
 419 static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp,
 420                             store_temp, 0x38, 0);
 421 static SENSOR_DEVICE_ATTR_2(temp5_crit, S_IRUGO | S_IWUSR, show_temp,
 422                             store_temp, 0x3e, 0);
 423
 424 static SENSOR_DEVICE_ATTR_2(temp6_input, S_IRUGO, show_temp, NULL, 0x07,
 425                             REG_TEMP_PECI_LSB);
 426
 427 static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
 428                             0x18, 0);
 429 static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, show_alarm, NULL,
 430                             0x18, 1);
 431 static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, show_alarm, NULL,
 432                             0x18, 2);
 433 static SENSOR_DEVICE_ATTR_2(temp4_min_alarm, S_IRUGO, show_alarm, NULL,
 434                             0x18, 3);
 435 static SENSOR_DEVICE_ATTR_2(temp5_min_alarm, S_IRUGO, show_alarm, NULL,
 436                             0x18, 4);
 437
 438 static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
 439                             0x19, 0);
 440 static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, show_alarm, NULL,
 441                             0x19, 1);
 442 static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, show_alarm, NULL,
 443                             0x19, 2);
 444 static SENSOR_DEVICE_ATTR_2(temp4_max_alarm, S_IRUGO, show_alarm, NULL,
 445                             0x19, 3);
 446 static SENSOR_DEVICE_ATTR_2(temp5_max_alarm, S_IRUGO, show_alarm, NULL,
 447                             0x19, 4);
 448
 449 static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
 450                             0x1b, 0);
 451 static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, show_alarm, NULL,
 452                             0x1b, 1);
 453 static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, show_alarm, NULL,
 454                             0x1b, 2);
 455 static SENSOR_DEVICE_ATTR_2(temp4_crit_alarm, S_IRUGO, show_alarm, NULL,
 456                             0x1b, 3);
 457 static SENSOR_DEVICE_ATTR_2(temp5_crit_alarm, S_IRUGO, show_alarm, NULL,
 458                             0x1b, 4);
 459
 460 static SENSOR_DEVICE_ATTR_2(temp1_fault, S_IRUGO, show_alarm, NULL, 0x17, 0);
 461 static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_alarm, NULL, 0x17, 1);
 462 static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_alarm, NULL, 0x17, 2);
 463
 464 static SENSOR_DEVICE_ATTR_2(temp1_beep, S_IRUGO | S_IWUSR, show_beep,
 465                             store_beep, 0x5c, 0);
 466 static SENSOR_DEVICE_ATTR_2(temp2_beep, S_IRUGO | S_IWUSR, show_beep,
 467                             store_beep, 0x5c, 1);
 468 static SENSOR_DEVICE_ATTR_2(temp3_beep, S_IRUGO | S_IWUSR, show_beep,
 469                             store_beep, 0x5c, 2);
 470 static SENSOR_DEVICE_ATTR_2(temp4_beep, S_IRUGO | S_IWUSR, show_beep,
 471                             store_beep, 0x5c, 3);
 472 static SENSOR_DEVICE_ATTR_2(temp5_beep, S_IRUGO | S_IWUSR, show_beep,
 473                             store_beep, 0x5c, 4);
 474 static SENSOR_DEVICE_ATTR_2(temp6_beep, S_IRUGO | S_IWUSR, show_beep,
 475                             store_beep, 0x5c, 5);
 476
 477 static struct attribute *nct7802_temp_attrs[] = {
 478         &sensor_dev_attr_temp1_input.dev_attr.attr,
 479         &sensor_dev_attr_temp1_min.dev_attr.attr,
 480         &sensor_dev_attr_temp1_max.dev_attr.attr,
 481         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 482         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 483         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 484         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 485         &sensor_dev_attr_temp1_fault.dev_attr.attr,
 486         &sensor_dev_attr_temp1_beep.dev_attr.attr,
 487
 488         &sensor_dev_attr_temp2_input.dev_attr.attr,             /* 9 */
 489         &sensor_dev_attr_temp2_min.dev_attr.attr,
 490         &sensor_dev_attr_temp2_max.dev_attr.attr,
 491         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 492         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 493         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 494         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 495         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 496         &sensor_dev_attr_temp2_beep.dev_attr.attr,
 497
 498         &sensor_dev_attr_temp3_input.dev_attr.attr,             /* 18 */
 499         &sensor_dev_attr_temp3_min.dev_attr.attr,
 500         &sensor_dev_attr_temp3_max.dev_attr.attr,
 501         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 502         &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
 503         &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 504         &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
 505         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 506         &sensor_dev_attr_temp3_beep.dev_attr.attr,
 507
 508         &sensor_dev_attr_temp4_input.dev_attr.attr,             /* 27 */
 509         &sensor_dev_attr_temp4_min.dev_attr.attr,
 510         &sensor_dev_attr_temp4_max.dev_attr.attr,
 511         &sensor_dev_attr_temp4_crit.dev_attr.attr,
 512         &sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
 513         &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
 514         &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
 515         &sensor_dev_attr_temp4_beep.dev_attr.attr,
 516
 517         &sensor_dev_attr_temp5_input.dev_attr.attr,             /* 35 */
 518         &sensor_dev_attr_temp5_min.dev_attr.attr,
 519         &sensor_dev_attr_temp5_max.dev_attr.attr,
 520         &sensor_dev_attr_temp5_crit.dev_attr.attr,
 521         &sensor_dev_attr_temp5_min_alarm.dev_attr.attr,
 522         &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
 523         &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
 524         &sensor_dev_attr_temp5_beep.dev_attr.attr,
 525
 526         &sensor_dev_attr_temp6_input.dev_attr.attr,             /* 43 */
 527         &sensor_dev_attr_temp6_beep.dev_attr.attr,
 528
 529         NULL
 530 };
 531
 532 static umode_t nct7802_temp_is_visible(struct kobject *kobj,
 533                                        struct attribute *attr, int index)
 534 {
 535         struct device *dev = container_of(kobj, struct device, kobj);
 536         struct nct7802_data *data = dev_get_drvdata(dev);
 537         unsigned int reg;
 538         int err;
 539
 540         err = regmap_read(data->regmap, REG_MODE, &reg);
 541         if (err < 0)
 542                 return 0;
 543
 544         if (index < 9 &&
 545             (reg & 03) != 0x01 && (reg & 0x03) != 0x02)         /* RD1 */
 546                 return 0;
 547         if (index >= 9 && index < 18 &&
 548             (reg & 0x0c) != 0x04 && (reg & 0x0c) != 0x08)       /* RD2 */
 549                 return 0;
 550         if (index >= 18 && index < 27 && (reg & 0x30) != 0x10)  /* RD3 */
 551                 return 0;
 552         if (index >= 27 && index < 35)                          /* local */
 553                 return attr->mode;
 554
 555         err = regmap_read(data->regmap, REG_PECI_ENABLE, &reg);
 556         if (err < 0)
 557                 return 0;
 558
 559         if (index >= 35 && index < 43 && !(reg & 0x01))         /* PECI 0 */
 560                 return 0;
 561
 562         if (index >= 0x43 && (!(reg & 0x02)))                   /* PECI 1 */
 563                 return 0;
 564
 565         return attr->mode;
 566 }
 567
 568 static struct attribute_group nct7802_temp_group = {
 569         .attrs = nct7802_temp_attrs,
 570         .is_visible = nct7802_temp_is_visible,
 571 };
 572
 573 static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO, show_in, NULL, 0, 0);
 574 static SENSOR_DEVICE_ATTR_2(in0_min, S_IRUGO | S_IWUSR, show_in, store_in,
 575                             0, 1);
 576 static SENSOR_DEVICE_ATTR_2(in0_max, S_IRUGO | S_IWUSR, show_in, store_in,
 577                             0, 2);
 578 static SENSOR_DEVICE_ATTR_2(in0_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 3);
 579 static SENSOR_DEVICE_ATTR_2(in0_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 580                             0x5a, 3);
 581
 582 static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO, show_in, NULL, 1, 0);
 583
 584 static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO, show_in, NULL, 2, 0);
 585 static SENSOR_DEVICE_ATTR_2(in2_min, S_IRUGO | S_IWUSR, show_in, store_in,
 586                             2, 1);
 587 static SENSOR_DEVICE_ATTR_2(in2_max, S_IRUGO | S_IWUSR, show_in, store_in,
 588                             2, 2);
 589 static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 0);
 590 static SENSOR_DEVICE_ATTR_2(in2_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 591                             0x5a, 0);
 592
 593 static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO, show_in, NULL, 3, 0);
 594 static SENSOR_DEVICE_ATTR_2(in3_min, S_IRUGO | S_IWUSR, show_in, store_in,
 595                             3, 1);
 596 static SENSOR_DEVICE_ATTR_2(in3_max, S_IRUGO | S_IWUSR, show_in, store_in,
 597                             3, 2);
 598 static SENSOR_DEVICE_ATTR_2(in3_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 1);
 599 static SENSOR_DEVICE_ATTR_2(in3_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 600                             0x5a, 1);
 601
 602 static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO, show_in, NULL, 4, 0);
 603 static SENSOR_DEVICE_ATTR_2(in4_min, S_IRUGO | S_IWUSR, show_in, store_in,
 604                             4, 1);
 605 static SENSOR_DEVICE_ATTR_2(in4_max, S_IRUGO | S_IWUSR, show_in, store_in,
 606                             4, 2);
 607 static SENSOR_DEVICE_ATTR_2(in4_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 2);
 608 static SENSOR_DEVICE_ATTR_2(in4_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 609                             0x5a, 2);
 610
 611 static struct attribute *nct7802_in_attrs[] = {
 612         &sensor_dev_attr_in0_input.dev_attr.attr,
 613         &sensor_dev_attr_in0_min.dev_attr.attr,
 614         &sensor_dev_attr_in0_max.dev_attr.attr,
 615         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 616         &sensor_dev_attr_in0_beep.dev_attr.attr,
 617
 618         &sensor_dev_attr_in1_input.dev_attr.attr,       /* 5 */
 619
 620         &sensor_dev_attr_in2_input.dev_attr.attr,       /* 6 */
 621         &sensor_dev_attr_in2_min.dev_attr.attr,
 622         &sensor_dev_attr_in2_max.dev_attr.attr,
 623         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 624         &sensor_dev_attr_in2_beep.dev_attr.attr,
 625
 626         &sensor_dev_attr_in3_input.dev_attr.attr,       /* 11 */
 627         &sensor_dev_attr_in3_min.dev_attr.attr,
 628         &sensor_dev_attr_in3_max.dev_attr.attr,
 629         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 630         &sensor_dev_attr_in3_beep.dev_attr.attr,
 631
 632         &sensor_dev_attr_in4_input.dev_attr.attr,       /* 17 */
 633         &sensor_dev_attr_in4_min.dev_attr.attr,
 634         &sensor_dev_attr_in4_max.dev_attr.attr,
 635         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 636         &sensor_dev_attr_in4_beep.dev_attr.attr,
 637
 638         NULL,
 639 };
 640
 641 static umode_t nct7802_in_is_visible(struct kobject *kobj,
 642                                      struct attribute *attr, int index)
 643 {
 644         struct device *dev = container_of(kobj, struct device, kobj);
 645         struct nct7802_data *data = dev_get_drvdata(dev);
 646         unsigned int reg;
 647         int err;
 648
 649         if (index < 6)                                          /* VCC, VCORE */
 650                 return attr->mode;
 651
 652         err = regmap_read(data->regmap, REG_MODE, &reg);
 653         if (err < 0)
 654                 return 0;
 655
 656         if (index >= 6 && index < 11 && (reg & 0x03) != 0x03)   /* VSEN1 */
 657                 return 0;
 658         if (index >= 11 && index < 17 && (reg & 0x0c) != 0x0c)  /* VSEN2 */
 659                 return 0;
 660         if (index >= 17 && (reg & 0x30) != 0x30)                /* VSEN3 */
 661                 return 0;
 662
 663         return attr->mode;
 664 }
 665
 666 static struct attribute_group nct7802_in_group = {
 667         .attrs = nct7802_in_attrs,
 668         .is_visible = nct7802_in_is_visible,
 669 };
 670
 671 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0x10);
 672 static SENSOR_DEVICE_ATTR_2(fan1_min, S_IRUGO | S_IWUSR, show_fan_min,
 673                             store_fan_min, 0x49, 0x4c);
 674 static SENSOR_DEVICE_ATTR_2(fan1_alarm, S_IRUGO, show_alarm, NULL, 0x1a, 0);
 675 static SENSOR_DEVICE_ATTR_2(fan1_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 676                             0x5b, 0);
 677 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 0x11);
 678 static SENSOR_DEVICE_ATTR_2(fan2_min, S_IRUGO | S_IWUSR, show_fan_min,
 679                             store_fan_min, 0x4a, 0x4d);
 680 static SENSOR_DEVICE_ATTR_2(fan2_alarm, S_IRUGO, show_alarm, NULL, 0x1a, 1);
 681 static SENSOR_DEVICE_ATTR_2(fan2_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 682                             0x5b, 1);
 683 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 0x12);
 684 static SENSOR_DEVICE_ATTR_2(fan3_min, S_IRUGO | S_IWUSR, show_fan_min,
 685                             store_fan_min, 0x4b, 0x4e);
 686 static SENSOR_DEVICE_ATTR_2(fan3_alarm, S_IRUGO, show_alarm, NULL, 0x1a, 2);
 687 static SENSOR_DEVICE_ATTR_2(fan3_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
 688                             0x5b, 2);
 689
 690 static struct attribute *nct7802_fan_attrs[] = {
 691         &sensor_dev_attr_fan1_input.dev_attr.attr,
 692         &sensor_dev_attr_fan1_min.dev_attr.attr,
 693         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 694         &sensor_dev_attr_fan1_beep.dev_attr.attr,
 695         &sensor_dev_attr_fan2_input.dev_attr.attr,
 696         &sensor_dev_attr_fan2_min.dev_attr.attr,
 697         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 698         &sensor_dev_attr_fan2_beep.dev_attr.attr,
 699         &sensor_dev_attr_fan3_input.dev_attr.attr,
 700         &sensor_dev_attr_fan3_min.dev_attr.attr,
 701         &sensor_dev_attr_fan3_alarm.dev_attr.attr,
 702         &sensor_dev_attr_fan3_beep.dev_attr.attr,
 703
 704         NULL
 705 };
 706
 707 static umode_t nct7802_fan_is_visible(struct kobject *kobj,
 708                                       struct attribute *attr, int index)
 709 {
 710         struct device *dev = container_of(kobj, struct device, kobj);
 711         struct nct7802_data *data = dev_get_drvdata(dev);
 712         int fan = index / 4;    /* 4 attributes per fan */
 713         unsigned int reg;
 714         int err;
 715
 716         err = regmap_read(data->regmap, REG_FAN_ENABLE, &reg);
 717         if (err < 0 || !(reg & (1 << fan)))
 718                 return 0;
 719
 720         return attr->mode;
 721 }
 722
 723 static struct attribute_group nct7802_fan_group = {
 724         .attrs = nct7802_fan_attrs,
 725         .is_visible = nct7802_fan_is_visible,
 726 };
 727
 728 static const struct attribute_group *nct7802_groups[] = {
 729         &nct7802_temp_group,
 730         &nct7802_in_group,
 731         &nct7802_fan_group,
 732         NULL
 733 };
 734
 735 static int nct7802_detect(struct i2c_client *client,
 736                           struct i2c_board_info *info)
 737 {
 738         int reg;
 739
 740         /*
 741          * Chip identification registers are only available in bank 0,
 742          * so only attempt chip detection if bank 0 is selected
 743          */
 744         reg = i2c_smbus_read_byte_data(client, REG_BANK);
 745         if (reg != 0x00)
 746                 return -ENODEV;
 747
 748         reg = i2c_smbus_read_byte_data(client, REG_VENDOR_ID);
 749         if (reg != 0x50)
 750                 return -ENODEV;
 751
 752         reg = i2c_smbus_read_byte_data(client, REG_CHIP_ID);
 753         if (reg != 0xc3)
 754                 return -ENODEV;
 755
 756         reg = i2c_smbus_read_byte_data(client, REG_VERSION_ID);
 757         if (reg < 0 || (reg & 0xf0) != 0x20)
 758                 return -ENODEV;
 759
 760         /* Also validate lower bits of voltage and temperature registers */
 761         reg = i2c_smbus_read_byte_data(client, REG_TEMP_LSB);
 762         if (reg < 0 || (reg & 0x1f))
 763                 return -ENODEV;
 764
 765         reg = i2c_smbus_read_byte_data(client, REG_TEMP_PECI_LSB);
 766         if (reg < 0 || (reg & 0x3f))
 767                 return -ENODEV;
 768
 769         reg = i2c_smbus_read_byte_data(client, REG_VOLTAGE_LOW);
 770         if (reg < 0 || (reg & 0x3f))
 771                 return -ENODEV;
 772
 773         strlcpy(info->type, "nct7802", I2C_NAME_SIZE);
 774         return 0;
 775 }
 776
 777 static bool nct7802_regmap_is_volatile(struct device *dev, unsigned int reg)
 778 {
 779         return reg != REG_BANK && reg <= 0x20;
 780 }
 781
 782 static const struct regmap_config nct7802_regmap_config = {
 783         .reg_bits = 8,
 784         .val_bits = 8,
 785         .cache_type = REGCACHE_RBTREE,
 786         .volatile_reg = nct7802_regmap_is_volatile,
 787 };
 788
 789 static int nct7802_init_chip(struct nct7802_data *data)
 790 {
 791         int err;
 792
 793         /* Enable ADC */
 794         err = regmap_update_bits(data->regmap, REG_START, 0x01, 0x01);
 795         if (err)
 796                 return err;
 797
 798         /* Enable local temperature sensor */
 799         err = regmap_update_bits(data->regmap, REG_MODE, 0x40, 0x40);
 800         if (err)
 801                 return err;
 802
 803         /* Enable Vcore and VCC voltage monitoring */
 804         return regmap_update_bits(data->regmap, REG_VMON_ENABLE, 0x03, 0x03);
 805 }
 806
 807 static int nct7802_probe(struct i2c_client *client,
 808                          const struct i2c_device_id *id)
 809 {
 810         struct device *dev = &client->dev;
 811         struct nct7802_data *data;
 812         struct device *hwmon_dev;
 813         int ret;
 814
 815         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 816         if (data == NULL)
 817                 return -ENOMEM;
 818
 819         data->regmap = devm_regmap_init_i2c(client, &nct7802_regmap_config);
 820         if (IS_ERR(data->regmap))
 821                 return PTR_ERR(data->regmap);
 822
 823         mutex_init(&data->access_lock);
 824
 825         ret = nct7802_init_chip(data);
 826         if (ret < 0)
 827                 return ret;
 828
 829         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 830                                                            data,
 831                                                            nct7802_groups);
 832         return PTR_ERR_OR_ZERO(hwmon_dev);
 833 }
 834
 835 static const unsigned short nct7802_address_list[] = {
 836         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END
 837 };
 838
 839 static const struct i2c_device_id nct7802_idtable[] = {
 840         { "nct7802", 0 },
 841         { }
 842 };
 843 MODULE_DEVICE_TABLE(i2c, nct7802_idtable);
 844
 845 static struct i2c_driver nct7802_driver = {
 846         .class = I2C_CLASS_HWMON,
 847         .driver = {
 848                 .name = DRVNAME,
 849         },
 850         .detect = nct7802_detect,
 851         .probe = nct7802_probe,
 852         .id_table = nct7802_idtable,
 853         .address_list = nct7802_address_list,
 854 };
 855
 856 module_i2c_driver(nct7802_driver);
 857
 858 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 859 MODULE_DESCRIPTION("NCT7802Y Hardware Monitoring Driver");
 860 MODULE_LICENSE("GPL v2");