drivers/hwmon/w83l786ng.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * w83l786ng.c - Linux kernel driver for hardware monitoring
   4  * Copyright (c) 2007 Kevin Lo <kevlo@kevlo.org>
   5  */
   6
   7 /*
   8  * Supports following chips:
   9  *
  10  * Chip         #vin    #fanin  #pwm    #temp   wchipid vendid  i2c     ISA
  11  * w83l786ng    3       2       2       2       0x7b    0x5ca3  yes     no
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/slab.h>
  17 #include <linux/i2c.h>
  18 #include <linux/hwmon.h>
  19 #include <linux/hwmon-sysfs.h>
  20 #include <linux/err.h>
  21 #include <linux/mutex.h>
  22 #include <linux/jiffies.h>
  23
  24 /* Addresses to scan */
  25 static const unsigned short normal_i2c[] = { 0x2e, 0x2f, I2C_CLIENT_END };
  26
  27 /* Insmod parameters */
  28
  29 static bool reset;
  30 module_param(reset, bool, 0);
  31 MODULE_PARM_DESC(reset, "Set to 1 to reset chip, not recommended");
  32
  33 #define W83L786NG_REG_IN_MIN(nr)        (0x2C + (nr) * 2)
  34 #define W83L786NG_REG_IN_MAX(nr)        (0x2B + (nr) * 2)
  35 #define W83L786NG_REG_IN(nr)            ((nr) + 0x20)
  36
  37 #define W83L786NG_REG_FAN(nr)           ((nr) + 0x28)
  38 #define W83L786NG_REG_FAN_MIN(nr)       ((nr) + 0x3B)
  39
  40 #define W83L786NG_REG_CONFIG            0x40
  41 #define W83L786NG_REG_ALARM1            0x41
  42 #define W83L786NG_REG_ALARM2            0x42
  43 #define W83L786NG_REG_GPIO_EN           0x47
  44 #define W83L786NG_REG_MAN_ID2           0x4C
  45 #define W83L786NG_REG_MAN_ID1           0x4D
  46 #define W83L786NG_REG_CHIP_ID           0x4E
  47
  48 #define W83L786NG_REG_DIODE             0x53
  49 #define W83L786NG_REG_FAN_DIV           0x54
  50 #define W83L786NG_REG_FAN_CFG           0x80
  51
  52 #define W83L786NG_REG_TOLERANCE         0x8D
  53
  54 static const u8 W83L786NG_REG_TEMP[2][3] = {
  55         { 0x25,         /* TEMP 0 in DataSheet */
  56           0x35,         /* TEMP 0 Over in DataSheet */
  57           0x36 },       /* TEMP 0 Hyst in DataSheet */
  58         { 0x26,         /* TEMP 1 in DataSheet */
  59           0x37,         /* TEMP 1 Over in DataSheet */
  60           0x38 }        /* TEMP 1 Hyst in DataSheet */
  61 };
  62
  63 static const u8 W83L786NG_PWM_MODE_SHIFT[] = {6, 7};
  64 static const u8 W83L786NG_PWM_ENABLE_SHIFT[] = {2, 4};
  65
  66 /* FAN Duty Cycle, be used to control */
  67 static const u8 W83L786NG_REG_PWM[] = {0x81, 0x87};
  68
  69
  70 static inline u8
  71 FAN_TO_REG(long rpm, int div)
  72 {
  73         if (rpm == 0)
  74                 return 255;
  75         rpm = clamp_val(rpm, 1, 1000000);
  76         return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
  77 }
  78
  79 #define FAN_FROM_REG(val, div)  ((val) == 0   ? -1 : \
  80                                 ((val) == 255 ? 0 : \
  81                                 1350000 / ((val) * (div))))
  82
  83 /* for temp */
  84 #define TEMP_TO_REG(val)        (clamp_val(((val) < 0 ? (val) + 0x100 * 1000 \
  85                                                       : (val)) / 1000, 0, 0xff))
  86 #define TEMP_FROM_REG(val)      (((val) & 0x80 ? \
  87                                   (val) - 0x100 : (val)) * 1000)
  88
  89 /*
  90  * The analog voltage inputs have 8mV LSB. Since the sysfs output is
  91  * in mV as would be measured on the chip input pin, need to just
  92  * multiply/divide by 8 to translate from/to register values.
  93  */
  94 #define IN_TO_REG(val)          (clamp_val((((val) + 4) / 8), 0, 255))
  95 #define IN_FROM_REG(val)        ((val) * 8)
  96
  97 #define DIV_FROM_REG(val)       (1 << (val))
  98
  99 static inline u8
 100 DIV_TO_REG(long val)
 101 {
 102         int i;
 103         val = clamp_val(val, 1, 128) >> 1;
 104         for (i = 0; i < 7; i++) {
 105                 if (val == 0)
 106                         break;
 107                 val >>= 1;
 108         }
 109         return (u8)i;
 110 }
 111
 112 struct w83l786ng_data {
 113         struct i2c_client *client;
 114         struct mutex update_lock;
 115         bool valid;                     /* true if following fields are valid */
 116         unsigned long last_updated;     /* In jiffies */
 117         unsigned long last_nonvolatile; /* In jiffies, last time we update the
 118                                          * nonvolatile registers */
 119
 120         u8 in[3];
 121         u8 in_max[3];
 122         u8 in_min[3];
 123         u8 fan[2];
 124         u8 fan_div[2];
 125         u8 fan_min[2];
 126         u8 temp_type[2];
 127         u8 temp[2][3];
 128         u8 pwm[2];
 129         u8 pwm_mode[2]; /* 0->DC variable voltage
 130                          * 1->PWM variable duty cycle */
 131
 132         u8 pwm_enable[2]; /* 1->manual
 133                            * 2->thermal cruise (also called SmartFan I) */
 134         u8 tolerance[2];
 135 };
 136
 137 static u8
 138 w83l786ng_read_value(struct i2c_client *client, u8 reg)
 139 {
 140         return i2c_smbus_read_byte_data(client, reg);
 141 }
 142
 143 static int
 144 w83l786ng_write_value(struct i2c_client *client, u8 reg, u8 value)
 145 {
 146         return i2c_smbus_write_byte_data(client, reg, value);
 147 }
 148
 149 static struct w83l786ng_data *w83l786ng_update_device(struct device *dev)
 150 {
 151         struct w83l786ng_data *data = dev_get_drvdata(dev);
 152         struct i2c_client *client = data->client;
 153         int i, j;
 154         u8 reg_tmp, pwmcfg;
 155
 156         mutex_lock(&data->update_lock);
 157         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 158             || !data->valid) {
 159                 dev_dbg(&client->dev, "Updating w83l786ng data.\n");
 160
 161                 /* Update the voltages measured value and limits */
 162                 for (i = 0; i < 3; i++) {
 163                         data->in[i] = w83l786ng_read_value(client,
 164                             W83L786NG_REG_IN(i));
 165                         data->in_min[i] = w83l786ng_read_value(client,
 166                             W83L786NG_REG_IN_MIN(i));
 167                         data->in_max[i] = w83l786ng_read_value(client,
 168                             W83L786NG_REG_IN_MAX(i));
 169                 }
 170
 171                 /* Update the fan counts and limits */
 172                 for (i = 0; i < 2; i++) {
 173                         data->fan[i] = w83l786ng_read_value(client,
 174                             W83L786NG_REG_FAN(i));
 175                         data->fan_min[i] = w83l786ng_read_value(client,
 176                             W83L786NG_REG_FAN_MIN(i));
 177                 }
 178
 179                 /* Update the fan divisor */
 180                 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
 181                 data->fan_div[0] = reg_tmp & 0x07;
 182                 data->fan_div[1] = (reg_tmp >> 4) & 0x07;
 183
 184                 pwmcfg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
 185                 for (i = 0; i < 2; i++) {
 186                         data->pwm_mode[i] =
 187                             ((pwmcfg >> W83L786NG_PWM_MODE_SHIFT[i]) & 1)
 188                             ? 0 : 1;
 189                         data->pwm_enable[i] =
 190                             ((pwmcfg >> W83L786NG_PWM_ENABLE_SHIFT[i]) & 3) + 1;
 191                         data->pwm[i] =
 192                             (w83l786ng_read_value(client, W83L786NG_REG_PWM[i])
 193                              & 0x0f) * 0x11;
 194                 }
 195
 196
 197                 /* Update the temperature sensors */
 198                 for (i = 0; i < 2; i++) {
 199                         for (j = 0; j < 3; j++) {
 200                                 data->temp[i][j] = w83l786ng_read_value(client,
 201                                     W83L786NG_REG_TEMP[i][j]);
 202                         }
 203                 }
 204
 205                 /* Update Smart Fan I/II tolerance */
 206                 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_TOLERANCE);
 207                 data->tolerance[0] = reg_tmp & 0x0f;
 208                 data->tolerance[1] = (reg_tmp >> 4) & 0x0f;
 209
 210                 data->last_updated = jiffies;
 211                 data->valid = true;
 212
 213         }
 214
 215         mutex_unlock(&data->update_lock);
 216
 217         return data;
 218 }
 219
 220 /* following are the sysfs callback functions */
 221 #define show_in_reg(reg) \
 222 static ssize_t \
 223 show_##reg(struct device *dev, struct device_attribute *attr, \
 224            char *buf) \
 225 { \
 226         int nr = to_sensor_dev_attr(attr)->index; \
 227         struct w83l786ng_data *data = w83l786ng_update_device(dev); \
 228         return sprintf(buf, "%d\n", IN_FROM_REG(data->reg[nr])); \
 229 }
 230
 231 show_in_reg(in)
 232 show_in_reg(in_min)
 233 show_in_reg(in_max)
 234
 235 #define store_in_reg(REG, reg) \
 236 static ssize_t \
 237 store_in_##reg(struct device *dev, struct device_attribute *attr, \
 238                const char *buf, size_t count) \
 239 { \
 240         int nr = to_sensor_dev_attr(attr)->index; \
 241         struct w83l786ng_data *data = dev_get_drvdata(dev); \
 242         struct i2c_client *client = data->client; \
 243         unsigned long val; \
 244         int err = kstrtoul(buf, 10, &val); \
 245         if (err) \
 246                 return err; \
 247         mutex_lock(&data->update_lock); \
 248         data->in_##reg[nr] = IN_TO_REG(val); \
 249         w83l786ng_write_value(client, W83L786NG_REG_IN_##REG(nr), \
 250                               data->in_##reg[nr]); \
 251         mutex_unlock(&data->update_lock); \
 252         return count; \
 253 }
 254
 255 store_in_reg(MIN, min)
 256 store_in_reg(MAX, max)
 257
 258 static struct sensor_device_attribute sda_in_input[] = {
 259         SENSOR_ATTR(in0_input, S_IRUGO, show_in, NULL, 0),
 260         SENSOR_ATTR(in1_input, S_IRUGO, show_in, NULL, 1),
 261         SENSOR_ATTR(in2_input, S_IRUGO, show_in, NULL, 2),
 262 };
 263
 264 static struct sensor_device_attribute sda_in_min[] = {
 265         SENSOR_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 0),
 266         SENSOR_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 1),
 267         SENSOR_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 2),
 268 };
 269
 270 static struct sensor_device_attribute sda_in_max[] = {
 271         SENSOR_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 0),
 272         SENSOR_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 1),
 273         SENSOR_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 2),
 274 };
 275
 276 #define show_fan_reg(reg) \
 277 static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
 278                           char *buf) \
 279 { \
 280         int nr = to_sensor_dev_attr(attr)->index; \
 281         struct w83l786ng_data *data = w83l786ng_update_device(dev); \
 282         return sprintf(buf, "%d\n", \
 283                 FAN_FROM_REG(data->reg[nr], DIV_FROM_REG(data->fan_div[nr]))); \
 284 }
 285
 286 show_fan_reg(fan);
 287 show_fan_reg(fan_min);
 288
 289 static ssize_t
 290 store_fan_min(struct device *dev, struct device_attribute *attr,
 291               const char *buf, size_t count)
 292 {
 293         int nr = to_sensor_dev_attr(attr)->index;
 294         struct w83l786ng_data *data = dev_get_drvdata(dev);
 295         struct i2c_client *client = data->client;
 296         unsigned long val;
 297         int err;
 298
 299         err = kstrtoul(buf, 10, &val);
 300         if (err)
 301                 return err;
 302
 303         mutex_lock(&data->update_lock);
 304         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 305         w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
 306                               data->fan_min[nr]);
 307         mutex_unlock(&data->update_lock);
 308
 309         return count;
 310 }
 311
 312 static ssize_t
 313 show_fan_div(struct device *dev, struct device_attribute *attr,
 314              char *buf)
 315 {
 316         int nr = to_sensor_dev_attr(attr)->index;
 317         struct w83l786ng_data *data = w83l786ng_update_device(dev);
 318         return sprintf(buf, "%u\n", DIV_FROM_REG(data->fan_div[nr]));
 319 }
 320
 321 /*
 322  * Note: we save and restore the fan minimum here, because its value is
 323  * determined in part by the fan divisor.  This follows the principle of
 324  * least surprise; the user doesn't expect the fan minimum to change just
 325  * because the divisor changed.
 326  */
 327 static ssize_t
 328 store_fan_div(struct device *dev, struct device_attribute *attr,
 329               const char *buf, size_t count)
 330 {
 331         int nr = to_sensor_dev_attr(attr)->index;
 332         struct w83l786ng_data *data = dev_get_drvdata(dev);
 333         struct i2c_client *client = data->client;
 334
 335         unsigned long min;
 336         u8 tmp_fan_div;
 337         u8 fan_div_reg;
 338         u8 keep_mask = 0;
 339         u8 new_shift = 0;
 340
 341         unsigned long val;
 342         int err;
 343
 344         err = kstrtoul(buf, 10, &val);
 345         if (err)
 346                 return err;
 347
 348         /* Save fan_min */
 349         mutex_lock(&data->update_lock);
 350         min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));
 351
 352         data->fan_div[nr] = DIV_TO_REG(val);
 353
 354         switch (nr) {
 355         case 0:
 356                 keep_mask = 0xf8;
 357                 new_shift = 0;
 358                 break;
 359         case 1:
 360                 keep_mask = 0x8f;
 361                 new_shift = 4;
 362                 break;
 363         }
 364
 365         fan_div_reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV)
 366                                            & keep_mask;
 367
 368         tmp_fan_div = (data->fan_div[nr] << new_shift) & ~keep_mask;
 369
 370         w83l786ng_write_value(client, W83L786NG_REG_FAN_DIV,
 371                               fan_div_reg | tmp_fan_div);
 372
 373         /* Restore fan_min */
 374         data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 375         w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
 376                               data->fan_min[nr]);
 377         mutex_unlock(&data->update_lock);
 378
 379         return count;
 380 }
 381
 382 static struct sensor_device_attribute sda_fan_input[] = {
 383         SENSOR_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0),
 384         SENSOR_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1),
 385 };
 386
 387 static struct sensor_device_attribute sda_fan_min[] = {
 388         SENSOR_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min,
 389                     store_fan_min, 0),
 390         SENSOR_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min,
 391                     store_fan_min, 1),
 392 };
 393
 394 static struct sensor_device_attribute sda_fan_div[] = {
 395         SENSOR_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div,
 396                     store_fan_div, 0),
 397         SENSOR_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div,
 398                     store_fan_div, 1),
 399 };
 400
 401
 402 /* read/write the temperature, includes measured value and limits */
 403
 404 static ssize_t
 405 show_temp(struct device *dev, struct device_attribute *attr, char *buf)
 406 {
 407         struct sensor_device_attribute_2 *sensor_attr =
 408             to_sensor_dev_attr_2(attr);
 409         int nr = sensor_attr->nr;
 410         int index = sensor_attr->index;
 411         struct w83l786ng_data *data = w83l786ng_update_device(dev);
 412         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr][index]));
 413 }
 414
 415 static ssize_t
 416 store_temp(struct device *dev, struct device_attribute *attr,
 417            const char *buf, size_t count)
 418 {
 419         struct sensor_device_attribute_2 *sensor_attr =
 420             to_sensor_dev_attr_2(attr);
 421         int nr = sensor_attr->nr;
 422         int index = sensor_attr->index;
 423         struct w83l786ng_data *data = dev_get_drvdata(dev);
 424         struct i2c_client *client = data->client;
 425         long val;
 426         int err;
 427
 428         err = kstrtol(buf, 10, &val);
 429         if (err)
 430                 return err;
 431
 432         mutex_lock(&data->update_lock);
 433         data->temp[nr][index] = TEMP_TO_REG(val);
 434         w83l786ng_write_value(client, W83L786NG_REG_TEMP[nr][index],
 435                               data->temp[nr][index]);
 436         mutex_unlock(&data->update_lock);
 437
 438         return count;
 439 }
 440
 441 static struct sensor_device_attribute_2 sda_temp_input[] = {
 442         SENSOR_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0),
 443         SENSOR_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, 0),
 444 };
 445
 446 static struct sensor_device_attribute_2 sda_temp_max[] = {
 447         SENSOR_ATTR_2(temp1_max, S_IRUGO | S_IWUSR,
 448                       show_temp, store_temp, 0, 1),
 449         SENSOR_ATTR_2(temp2_max, S_IRUGO | S_IWUSR,
 450                       show_temp, store_temp, 1, 1),
 451 };
 452
 453 static struct sensor_device_attribute_2 sda_temp_max_hyst[] = {
 454         SENSOR_ATTR_2(temp1_max_hyst, S_IRUGO | S_IWUSR,
 455                       show_temp, store_temp, 0, 2),
 456         SENSOR_ATTR_2(temp2_max_hyst, S_IRUGO | S_IWUSR,
 457                       show_temp, store_temp, 1, 2),
 458 };
 459
 460 #define show_pwm_reg(reg) \
 461 static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
 462                           char *buf) \
 463 { \
 464         struct w83l786ng_data *data = w83l786ng_update_device(dev); \
 465         int nr = to_sensor_dev_attr(attr)->index; \
 466         return sprintf(buf, "%d\n", data->reg[nr]); \
 467 }
 468
 469 show_pwm_reg(pwm_mode)
 470 show_pwm_reg(pwm_enable)
 471 show_pwm_reg(pwm)
 472
 473 static ssize_t
 474 store_pwm_mode(struct device *dev, struct device_attribute *attr,
 475                const char *buf, size_t count)
 476 {
 477         int nr = to_sensor_dev_attr(attr)->index;
 478         struct w83l786ng_data *data = dev_get_drvdata(dev);
 479         struct i2c_client *client = data->client;
 480         u8 reg;
 481         unsigned long val;
 482         int err;
 483
 484         err = kstrtoul(buf, 10, &val);
 485         if (err)
 486                 return err;
 487
 488         if (val > 1)
 489                 return -EINVAL;
 490         mutex_lock(&data->update_lock);
 491         data->pwm_mode[nr] = val;
 492         reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
 493         reg &= ~(1 << W83L786NG_PWM_MODE_SHIFT[nr]);
 494         if (!val)
 495                 reg |= 1 << W83L786NG_PWM_MODE_SHIFT[nr];
 496         w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
 497         mutex_unlock(&data->update_lock);
 498         return count;
 499 }
 500
 501 static ssize_t
 502 store_pwm(struct device *dev, struct device_attribute *attr,
 503           const char *buf, size_t count)
 504 {
 505         int nr = to_sensor_dev_attr(attr)->index;
 506         struct w83l786ng_data *data = dev_get_drvdata(dev);
 507         struct i2c_client *client = data->client;
 508         unsigned long val;
 509         int err;
 510
 511         err = kstrtoul(buf, 10, &val);
 512         if (err)
 513                 return err;
 514         val = clamp_val(val, 0, 255);
 515         val = DIV_ROUND_CLOSEST(val, 0x11);
 516
 517         mutex_lock(&data->update_lock);
 518         data->pwm[nr] = val * 0x11;
 519         val |= w83l786ng_read_value(client, W83L786NG_REG_PWM[nr]) & 0xf0;
 520         w83l786ng_write_value(client, W83L786NG_REG_PWM[nr], val);
 521         mutex_unlock(&data->update_lock);
 522         return count;
 523 }
 524
 525 static ssize_t
 526 store_pwm_enable(struct device *dev, struct device_attribute *attr,
 527                  const char *buf, size_t count)
 528 {
 529         int nr = to_sensor_dev_attr(attr)->index;
 530         struct w83l786ng_data *data = dev_get_drvdata(dev);
 531         struct i2c_client *client = data->client;
 532         u8 reg;
 533         unsigned long val;
 534         int err;
 535
 536         err = kstrtoul(buf, 10, &val);
 537         if (err)
 538                 return err;
 539
 540         if (!val || val > 2)  /* only modes 1 and 2 are supported */
 541                 return -EINVAL;
 542
 543         mutex_lock(&data->update_lock);
 544         reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
 545         data->pwm_enable[nr] = val;
 546         reg &= ~(0x03 << W83L786NG_PWM_ENABLE_SHIFT[nr]);
 547         reg |= (val - 1) << W83L786NG_PWM_ENABLE_SHIFT[nr];
 548         w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
 549         mutex_unlock(&data->update_lock);
 550         return count;
 551 }
 552
 553 static struct sensor_device_attribute sda_pwm[] = {
 554         SENSOR_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0),
 555         SENSOR_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 1),
 556 };
 557
 558 static struct sensor_device_attribute sda_pwm_mode[] = {
 559         SENSOR_ATTR(pwm1_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
 560                     store_pwm_mode, 0),
 561         SENSOR_ATTR(pwm2_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
 562                     store_pwm_mode, 1),
 563 };
 564
 565 static struct sensor_device_attribute sda_pwm_enable[] = {
 566         SENSOR_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
 567                     store_pwm_enable, 0),
 568         SENSOR_ATTR(pwm2_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
 569                     store_pwm_enable, 1),
 570 };
 571
 572 /* For Smart Fan I/Thermal Cruise and Smart Fan II */
 573 static ssize_t
 574 show_tolerance(struct device *dev, struct device_attribute *attr, char *buf)
 575 {
 576         int nr = to_sensor_dev_attr(attr)->index;
 577         struct w83l786ng_data *data = w83l786ng_update_device(dev);
 578         return sprintf(buf, "%ld\n", (long)data->tolerance[nr]);
 579 }
 580
 581 static ssize_t
 582 store_tolerance(struct device *dev, struct device_attribute *attr,
 583                 const char *buf, size_t count)
 584 {
 585         int nr = to_sensor_dev_attr(attr)->index;
 586         struct w83l786ng_data *data = dev_get_drvdata(dev);
 587         struct i2c_client *client = data->client;
 588         u8 tol_tmp, tol_mask;
 589         unsigned long val;
 590         int err;
 591
 592         err = kstrtoul(buf, 10, &val);
 593         if (err)
 594                 return err;
 595
 596         mutex_lock(&data->update_lock);
 597         tol_mask = w83l786ng_read_value(client,
 598             W83L786NG_REG_TOLERANCE) & ((nr == 1) ? 0x0f : 0xf0);
 599         tol_tmp = clamp_val(val, 0, 15);
 600         tol_tmp &= 0x0f;
 601         data->tolerance[nr] = tol_tmp;
 602         if (nr == 1)
 603                 tol_tmp <<= 4;
 604
 605         w83l786ng_write_value(client, W83L786NG_REG_TOLERANCE,
 606                               tol_mask | tol_tmp);
 607         mutex_unlock(&data->update_lock);
 608         return count;
 609 }
 610
 611 static struct sensor_device_attribute sda_tolerance[] = {
 612         SENSOR_ATTR(pwm1_tolerance, S_IWUSR | S_IRUGO,
 613                     show_tolerance, store_tolerance, 0),
 614         SENSOR_ATTR(pwm2_tolerance, S_IWUSR | S_IRUGO,
 615                     show_tolerance, store_tolerance, 1),
 616 };
 617
 618
 619 #define IN_UNIT_ATTRS(X)        \
 620         &sda_in_input[X].dev_attr.attr,         \
 621         &sda_in_min[X].dev_attr.attr,           \
 622         &sda_in_max[X].dev_attr.attr
 623
 624 #define FAN_UNIT_ATTRS(X)       \
 625         &sda_fan_input[X].dev_attr.attr,        \
 626         &sda_fan_min[X].dev_attr.attr,          \
 627         &sda_fan_div[X].dev_attr.attr
 628
 629 #define TEMP_UNIT_ATTRS(X)      \
 630         &sda_temp_input[X].dev_attr.attr,       \
 631         &sda_temp_max[X].dev_attr.attr,         \
 632         &sda_temp_max_hyst[X].dev_attr.attr
 633
 634 #define PWM_UNIT_ATTRS(X)       \
 635         &sda_pwm[X].dev_attr.attr,              \
 636         &sda_pwm_mode[X].dev_attr.attr,         \
 637         &sda_pwm_enable[X].dev_attr.attr
 638
 639 #define TOLERANCE_UNIT_ATTRS(X) \
 640         &sda_tolerance[X].dev_attr.attr
 641
 642 static struct attribute *w83l786ng_attrs[] = {
 643         IN_UNIT_ATTRS(0),
 644         IN_UNIT_ATTRS(1),
 645         IN_UNIT_ATTRS(2),
 646         FAN_UNIT_ATTRS(0),
 647         FAN_UNIT_ATTRS(1),
 648         TEMP_UNIT_ATTRS(0),
 649         TEMP_UNIT_ATTRS(1),
 650         PWM_UNIT_ATTRS(0),
 651         PWM_UNIT_ATTRS(1),
 652         TOLERANCE_UNIT_ATTRS(0),
 653         TOLERANCE_UNIT_ATTRS(1),
 654         NULL
 655 };
 656
 657 ATTRIBUTE_GROUPS(w83l786ng);
 658
 659 static int
 660 w83l786ng_detect(struct i2c_client *client, struct i2c_board_info *info)
 661 {
 662         struct i2c_adapter *adapter = client->adapter;
 663         u16 man_id;
 664         u8 chip_id;
 665
 666         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 667                 return -ENODEV;
 668
 669         /* Detection */
 670         if ((w83l786ng_read_value(client, W83L786NG_REG_CONFIG) & 0x80)) {
 671                 dev_dbg(&adapter->dev, "W83L786NG detection failed at 0x%02x\n",
 672                         client->addr);
 673                 return -ENODEV;
 674         }
 675
 676         /* Identification */
 677         man_id = (w83l786ng_read_value(client, W83L786NG_REG_MAN_ID1) << 8) +
 678                  w83l786ng_read_value(client, W83L786NG_REG_MAN_ID2);
 679         chip_id = w83l786ng_read_value(client, W83L786NG_REG_CHIP_ID);
 680
 681         if (man_id != 0x5CA3 ||         /* Winbond */
 682             chip_id != 0x80) {          /* W83L786NG */
 683                 dev_dbg(&adapter->dev,
 684                         "Unsupported chip (man_id=0x%04X, chip_id=0x%02X)\n",
 685                         man_id, chip_id);
 686                 return -ENODEV;
 687         }
 688
 689         strscpy(info->type, "w83l786ng", I2C_NAME_SIZE);
 690
 691         return 0;
 692 }
 693
 694 static void w83l786ng_init_client(struct i2c_client *client)
 695 {
 696         u8 tmp;
 697
 698         if (reset)
 699                 w83l786ng_write_value(client, W83L786NG_REG_CONFIG, 0x80);
 700
 701         /* Start monitoring */
 702         tmp = w83l786ng_read_value(client, W83L786NG_REG_CONFIG);
 703         if (!(tmp & 0x01))
 704                 w83l786ng_write_value(client, W83L786NG_REG_CONFIG, tmp | 0x01);
 705 }
 706
 707 static int
 708 w83l786ng_probe(struct i2c_client *client)
 709 {
 710         struct device *dev = &client->dev;
 711         struct w83l786ng_data *data;
 712         struct device *hwmon_dev;
 713         int i;
 714         u8 reg_tmp;
 715
 716         data = devm_kzalloc(dev, sizeof(struct w83l786ng_data), GFP_KERNEL);
 717         if (!data)
 718                 return -ENOMEM;
 719
 720         data->client = client;
 721         mutex_init(&data->update_lock);
 722
 723         /* Initialize the chip */
 724         w83l786ng_init_client(client);
 725
 726         /* A few vars need to be filled upon startup */
 727         for (i = 0; i < 2; i++) {
 728                 data->fan_min[i] = w83l786ng_read_value(client,
 729                     W83L786NG_REG_FAN_MIN(i));
 730         }
 731
 732         /* Update the fan divisor */
 733         reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
 734         data->fan_div[0] = reg_tmp & 0x07;
 735         data->fan_div[1] = (reg_tmp >> 4) & 0x07;
 736
 737         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 738                                                            data,
 739                                                            w83l786ng_groups);
 740         return PTR_ERR_OR_ZERO(hwmon_dev);
 741 }
 742
 743 static const struct i2c_device_id w83l786ng_id[] = {
 744         { "w83l786ng" },
 745         { }
 746 };
 747 MODULE_DEVICE_TABLE(i2c, w83l786ng_id);
 748
 749 static struct i2c_driver w83l786ng_driver = {
 750         .class          = I2C_CLASS_HWMON,
 751         .driver = {
 752                    .name = "w83l786ng",
 753         },
 754         .probe          = w83l786ng_probe,
 755         .id_table       = w83l786ng_id,
 756         .detect         = w83l786ng_detect,
 757         .address_list   = normal_i2c,
 758 };
 759
 760 module_i2c_driver(w83l786ng_driver);
 761
 762 MODULE_AUTHOR("Kevin Lo");
 763 MODULE_DESCRIPTION("w83l786ng driver");
 764 MODULE_LICENSE("GPL");