drivers/hwmon/w83l786ng.c

   1 /*
   2  * w83l786ng.c - Linux kernel driver for hardware monitoring
   3  * Copyright (c) 2007 Kevin Lo <kevlo@kevlo.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation - version 2.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301 USA.
  18  */
  19
  20 /*
  21  * Supports following chips:
  22  *
  23  * Chip         #vin    #fanin  #pwm    #temp   wchipid vendid  i2c     ISA
  24  * w83l786ng    3       2       2       2       0x7b    0x5ca3  yes     no
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/slab.h>
  30 #include <linux/i2c.h>
  31 #include <linux/hwmon.h>
  32 #include <linux/hwmon-vid.h>
  33 #include <linux/hwmon-sysfs.h>
  34 #include <linux/err.h>
  35 #include <linux/mutex.h>
  36 #include <linux/jiffies.h>
  37
  38 /* Addresses to scan */
  39 static const unsigned short normal_i2c[] = { 0x2e, 0x2f, I2C_CLIENT_END };
  40
  41 /* Insmod parameters */
  42
  43 static bool reset;
  44 module_param(reset, bool, 0);
  45 MODULE_PARM_DESC(reset, "Set to 1 to reset chip, not recommended");
  46
  47 #define W83L786NG_REG_IN_MIN(nr)        (0x2C + (nr) * 2)
  48 #define W83L786NG_REG_IN_MAX(nr)        (0x2B + (nr) * 2)
  49 #define W83L786NG_REG_IN(nr)            ((nr) + 0x20)
  50
  51 #define W83L786NG_REG_FAN(nr)           ((nr) + 0x28)
  52 #define W83L786NG_REG_FAN_MIN(nr)       ((nr) + 0x3B)
  53
  54 #define W83L786NG_REG_CONFIG            0x40
  55 #define W83L786NG_REG_ALARM1            0x41
  56 #define W83L786NG_REG_ALARM2            0x42
  57 #define W83L786NG_REG_GPIO_EN           0x47
  58 #define W83L786NG_REG_MAN_ID2           0x4C
  59 #define W83L786NG_REG_MAN_ID1           0x4D
  60 #define W83L786NG_REG_CHIP_ID           0x4E
  61
  62 #define W83L786NG_REG_DIODE             0x53
  63 #define W83L786NG_REG_FAN_DIV           0x54
  64 #define W83L786NG_REG_FAN_CFG           0x80
  65
  66 #define W83L786NG_REG_TOLERANCE         0x8D
  67
  68 static const u8 W83L786NG_REG_TEMP[2][3] = {
  69         { 0x25,         /* TEMP 0 in DataSheet */
  70           0x35,         /* TEMP 0 Over in DataSheet */
  71           0x36 },       /* TEMP 0 Hyst in DataSheet */
  72         { 0x26,         /* TEMP 1 in DataSheet */
  73           0x37,         /* TEMP 1 Over in DataSheet */
  74           0x38 }        /* TEMP 1 Hyst in DataSheet */
  75 };
  76
  77 static const u8 W83L786NG_PWM_MODE_SHIFT[] = {6, 7};
  78 static const u8 W83L786NG_PWM_ENABLE_SHIFT[] = {2, 4};
  79
  80 /* FAN Duty Cycle, be used to control */
  81 static const u8 W83L786NG_REG_PWM[] = {0x81, 0x87};
  82
  83
  84 static inline u8
  85 FAN_TO_REG(long rpm, int div)
  86 {
  87         if (rpm == 0)
  88                 return 255;
  89         rpm = clamp_val(rpm, 1, 1000000);
  90         return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
  91 }
  92
  93 #define FAN_FROM_REG(val, div)  ((val) == 0   ? -1 : \
  94                                 ((val) == 255 ? 0 : \
  95                                 1350000 / ((val) * (div))))
  96
  97 /* for temp */
  98 #define TEMP_TO_REG(val)        (clamp_val(((val) < 0 ? (val) + 0x100 * 1000 \
  99                                                       : (val)) / 1000, 0, 0xff))
 100 #define TEMP_FROM_REG(val)      (((val) & 0x80 ? \
 101                                   (val) - 0x100 : (val)) * 1000)
 102
 103 /*
 104  * The analog voltage inputs have 8mV LSB. Since the sysfs output is
 105  * in mV as would be measured on the chip input pin, need to just
 106  * multiply/divide by 8 to translate from/to register values.
 107  */
 108 #define IN_TO_REG(val)          (clamp_val((((val) + 4) / 8), 0, 255))
 109 #define IN_FROM_REG(val)        ((val) * 8)
 110
 111 #define DIV_FROM_REG(val)       (1 << (val))
 112
 113 static inline u8
 114 DIV_TO_REG(long val)
 115 {
 116         int i;
 117         val = clamp_val(val, 1, 128) >> 1;
 118         for (i = 0; i < 7; i++) {
 119                 if (val == 0)
 120                         break;
 121                 val >>= 1;
 122         }
 123         return (u8)i;
 124 }
 125
 126 struct w83l786ng_data {
 127         struct i2c_client *client;
 128         struct mutex update_lock;
 129         char valid;                     /* !=0 if following fields are valid */
 130         unsigned long last_updated;     /* In jiffies */
 131         unsigned long last_nonvolatile; /* In jiffies, last time we update the
 132                                          * nonvolatile registers */
 133
 134         u8 in[3];
 135         u8 in_max[3];
 136         u8 in_min[3];
 137         u8 fan[2];
 138         u8 fan_div[2];
 139         u8 fan_min[2];
 140         u8 temp_type[2];
 141         u8 temp[2][3];
 142         u8 pwm[2];
 143         u8 pwm_mode[2]; /* 0->DC variable voltage
 144                          * 1->PWM variable duty cycle */
 145
 146         u8 pwm_enable[2]; /* 1->manual
 147                            * 2->thermal cruise (also called SmartFan I) */
 148         u8 tolerance[2];
 149 };
 150
 151 static u8
 152 w83l786ng_read_value(struct i2c_client *client, u8 reg)
 153 {
 154         return i2c_smbus_read_byte_data(client, reg);
 155 }
 156
 157 static int
 158 w83l786ng_write_value(struct i2c_client *client, u8 reg, u8 value)
 159 {
 160         return i2c_smbus_write_byte_data(client, reg, value);
 161 }
 162
 163 static struct w83l786ng_data *w83l786ng_update_device(struct device *dev)
 164 {
 165         struct w83l786ng_data *data = dev_get_drvdata(dev);
 166         struct i2c_client *client = data->client;
 167         int i, j;
 168         u8 reg_tmp, pwmcfg;
 169
 170         mutex_lock(&data->update_lock);
 171         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 172             || !data->valid) {
 173                 dev_dbg(&client->dev, "Updating w83l786ng data.\n");
 174
 175                 /* Update the voltages measured value and limits */
 176                 for (i = 0; i < 3; i++) {
 177                         data->in[i] = w83l786ng_read_value(client,
 178                             W83L786NG_REG_IN(i));
 179                         data->in_min[i] = w83l786ng_read_value(client,
 180                             W83L786NG_REG_IN_MIN(i));
 181                         data->in_max[i] = w83l786ng_read_value(client,
 182                             W83L786NG_REG_IN_MAX(i));
 183                 }
 184
 185                 /* Update the fan counts and limits */
 186                 for (i = 0; i < 2; i++) {
 187                         data->fan[i] = w83l786ng_read_value(client,
 188                             W83L786NG_REG_FAN(i));
 189                         data->fan_min[i] = w83l786ng_read_value(client,
 190                             W83L786NG_REG_FAN_MIN(i));
 191                 }
 192
 193                 /* Update the fan divisor */
 194                 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
 195                 data->fan_div[0] = reg_tmp & 0x07;
 196                 data->fan_div[1] = (reg_tmp >> 4) & 0x07;
 197
 198                 pwmcfg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
 199                 for (i = 0; i < 2; i++) {
 200                         data->pwm_mode[i] =
 201                             ((pwmcfg >> W83L786NG_PWM_MODE_SHIFT[i]) & 1)
 202                             ? 0 : 1;
 203                         data->pwm_enable[i] =
 204                             ((pwmcfg >> W83L786NG_PWM_ENABLE_SHIFT[i]) & 3) + 1;
 205                         data->pwm[i] =
 206                             (w83l786ng_read_value(client, W83L786NG_REG_PWM[i])
 207                              & 0x0f) * 0x11;
 208                 }
 209
 210
 211                 /* Update the temperature sensors */
 212                 for (i = 0; i < 2; i++) {
 213                         for (j = 0; j < 3; j++) {
 214                                 data->temp[i][j] = w83l786ng_read_value(client,
 215                                     W83L786NG_REG_TEMP[i][j]);
 216                         }
 217                 }
 218
 219                 /* Update Smart Fan I/II tolerance */
 220                 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_TOLERANCE);
 221                 data->tolerance[0] = reg_tmp & 0x0f;
 222                 data->tolerance[1] = (reg_tmp >> 4) & 0x0f;
 223
 224                 data->last_updated = jiffies;
 225                 data->valid = 1;
 226
 227         }
 228
 229         mutex_unlock(&data->update_lock);
 230
 231         return data;
 232 }
 233
 234 /* following are the sysfs callback functions */
 235 #define show_in_reg(reg) \
 236 static ssize_t \
 237 show_##reg(struct device *dev, struct device_attribute *attr, \
 238            char *buf) \
 239 { \
 240         int nr = to_sensor_dev_attr(attr)->index; \
 241         struct w83l786ng_data *data = w83l786ng_update_device(dev); \
 242         return sprintf(buf, "%d\n", IN_FROM_REG(data->reg[nr])); \
 243 }
 244
 245 show_in_reg(in)
 246 show_in_reg(in_min)
 247 show_in_reg(in_max)
 248
 249 #define store_in_reg(REG, reg) \
 250 static ssize_t \
 251 store_in_##reg(struct device *dev, struct device_attribute *attr, \
 252                const char *buf, size_t count) \
 253 { \
 254         int nr = to_sensor_dev_attr(attr)->index; \
 255         struct w83l786ng_data *data = dev_get_drvdata(dev); \
 256         struct i2c_client *client = data->client; \
 257         unsigned long val; \
 258         int err = kstrtoul(buf, 10, &val); \
 259         if (err) \
 260                 return err; \
 261         mutex_lock(&data->update_lock); \
 262         data->in_##reg[nr] = IN_TO_REG(val); \
 263         w83l786ng_write_value(client, W83L786NG_REG_IN_##REG(nr), \
 264                               data->in_##reg[nr]); \
 265         mutex_unlock(&data->update_lock); \
 266         return count; \
 267 }
 268
 269 store_in_reg(MIN, min)
 270 store_in_reg(MAX, max)
 271
 272 static struct sensor_device_attribute sda_in_input[] = {
 273         SENSOR_ATTR(in0_input, S_IRUGO, show_in, NULL, 0),
 274         SENSOR_ATTR(in1_input, S_IRUGO, show_in, NULL, 1),
 275         SENSOR_ATTR(in2_input, S_IRUGO, show_in, NULL, 2),
 276 };
 277
 278 static struct sensor_device_attribute sda_in_min[] = {
 279         SENSOR_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 0),
 280         SENSOR_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 1),
 281         SENSOR_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 2),
 282 };
 283
 284 static struct sensor_device_attribute sda_in_max[] = {
 285         SENSOR_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 0),
 286         SENSOR_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 1),
 287         SENSOR_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 2),
 288 };
 289
 290 #define show_fan_reg(reg) \
 291 static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
 292                           char *buf) \
 293 { \
 294         int nr = to_sensor_dev_attr(attr)->index; \
 295         struct w83l786ng_data *data = w83l786ng_update_device(dev); \
 296         return sprintf(buf, "%d\n", \
 297                 FAN_FROM_REG(data->reg[nr], DIV_FROM_REG(data->fan_div[nr]))); \
 298 }
 299
 300 show_fan_reg(fan);
 301 show_fan_reg(fan_min);
 302
 303 static ssize_t
 304 store_fan_min(struct device *dev, struct device_attribute *attr,
 305               const char *buf, size_t count)
 306 {
 307         int nr = to_sensor_dev_attr(attr)->index;
 308         struct w83l786ng_data *data = dev_get_drvdata(dev);
 309         struct i2c_client *client = data->client;
 310         unsigned long val;
 311         int err;
 312
 313         err = kstrtoul(buf, 10, &val);
 314         if (err)
 315                 return err;
 316
 317         mutex_lock(&data->update_lock);
 318         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 319         w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
 320                               data->fan_min[nr]);
 321         mutex_unlock(&data->update_lock);
 322
 323         return count;
 324 }
 325
 326 static ssize_t
 327 show_fan_div(struct device *dev, struct device_attribute *attr,
 328              char *buf)
 329 {
 330         int nr = to_sensor_dev_attr(attr)->index;
 331         struct w83l786ng_data *data = w83l786ng_update_device(dev);
 332         return sprintf(buf, "%u\n", DIV_FROM_REG(data->fan_div[nr]));
 333 }
 334
 335 /*
 336  * Note: we save and restore the fan minimum here, because its value is
 337  * determined in part by the fan divisor.  This follows the principle of
 338  * least surprise; the user doesn't expect the fan minimum to change just
 339  * because the divisor changed.
 340  */
 341 static ssize_t
 342 store_fan_div(struct device *dev, struct device_attribute *attr,
 343               const char *buf, size_t count)
 344 {
 345         int nr = to_sensor_dev_attr(attr)->index;
 346         struct w83l786ng_data *data = dev_get_drvdata(dev);
 347         struct i2c_client *client = data->client;
 348
 349         unsigned long min;
 350         u8 tmp_fan_div;
 351         u8 fan_div_reg;
 352         u8 keep_mask = 0;
 353         u8 new_shift = 0;
 354
 355         unsigned long val;
 356         int err;
 357
 358         err = kstrtoul(buf, 10, &val);
 359         if (err)
 360                 return err;
 361
 362         /* Save fan_min */
 363         mutex_lock(&data->update_lock);
 364         min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));
 365
 366         data->fan_div[nr] = DIV_TO_REG(val);
 367
 368         switch (nr) {
 369         case 0:
 370                 keep_mask = 0xf8;
 371                 new_shift = 0;
 372                 break;
 373         case 1:
 374                 keep_mask = 0x8f;
 375                 new_shift = 4;
 376                 break;
 377         }
 378
 379         fan_div_reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV)
 380                                            & keep_mask;
 381
 382         tmp_fan_div = (data->fan_div[nr] << new_shift) & ~keep_mask;
 383
 384         w83l786ng_write_value(client, W83L786NG_REG_FAN_DIV,
 385                               fan_div_reg | tmp_fan_div);
 386
 387         /* Restore fan_min */
 388         data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 389         w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
 390                               data->fan_min[nr]);
 391         mutex_unlock(&data->update_lock);
 392
 393         return count;
 394 }
 395
 396 static struct sensor_device_attribute sda_fan_input[] = {
 397         SENSOR_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0),
 398         SENSOR_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1),
 399 };
 400
 401 static struct sensor_device_attribute sda_fan_min[] = {
 402         SENSOR_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min,
 403                     store_fan_min, 0),
 404         SENSOR_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min,
 405                     store_fan_min, 1),
 406 };
 407
 408 static struct sensor_device_attribute sda_fan_div[] = {
 409         SENSOR_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div,
 410                     store_fan_div, 0),
 411         SENSOR_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div,
 412                     store_fan_div, 1),
 413 };
 414
 415
 416 /* read/write the temperature, includes measured value and limits */
 417
 418 static ssize_t
 419 show_temp(struct device *dev, struct device_attribute *attr, char *buf)
 420 {
 421         struct sensor_device_attribute_2 *sensor_attr =
 422             to_sensor_dev_attr_2(attr);
 423         int nr = sensor_attr->nr;
 424         int index = sensor_attr->index;
 425         struct w83l786ng_data *data = w83l786ng_update_device(dev);
 426         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr][index]));
 427 }
 428
 429 static ssize_t
 430 store_temp(struct device *dev, struct device_attribute *attr,
 431            const char *buf, size_t count)
 432 {
 433         struct sensor_device_attribute_2 *sensor_attr =
 434             to_sensor_dev_attr_2(attr);
 435         int nr = sensor_attr->nr;
 436         int index = sensor_attr->index;
 437         struct w83l786ng_data *data = dev_get_drvdata(dev);
 438         struct i2c_client *client = data->client;
 439         long val;
 440         int err;
 441
 442         err = kstrtol(buf, 10, &val);
 443         if (err)
 444                 return err;
 445
 446         mutex_lock(&data->update_lock);
 447         data->temp[nr][index] = TEMP_TO_REG(val);
 448         w83l786ng_write_value(client, W83L786NG_REG_TEMP[nr][index],
 449                               data->temp[nr][index]);
 450         mutex_unlock(&data->update_lock);
 451
 452         return count;
 453 }
 454
 455 static struct sensor_device_attribute_2 sda_temp_input[] = {
 456         SENSOR_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0),
 457         SENSOR_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, 0),
 458 };
 459
 460 static struct sensor_device_attribute_2 sda_temp_max[] = {
 461         SENSOR_ATTR_2(temp1_max, S_IRUGO | S_IWUSR,
 462                       show_temp, store_temp, 0, 1),
 463         SENSOR_ATTR_2(temp2_max, S_IRUGO | S_IWUSR,
 464                       show_temp, store_temp, 1, 1),
 465 };
 466
 467 static struct sensor_device_attribute_2 sda_temp_max_hyst[] = {
 468         SENSOR_ATTR_2(temp1_max_hyst, S_IRUGO | S_IWUSR,
 469                       show_temp, store_temp, 0, 2),
 470         SENSOR_ATTR_2(temp2_max_hyst, S_IRUGO | S_IWUSR,
 471                       show_temp, store_temp, 1, 2),
 472 };
 473
 474 #define show_pwm_reg(reg) \
 475 static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
 476                           char *buf) \
 477 { \
 478         struct w83l786ng_data *data = w83l786ng_update_device(dev); \
 479         int nr = to_sensor_dev_attr(attr)->index; \
 480         return sprintf(buf, "%d\n", data->reg[nr]); \
 481 }
 482
 483 show_pwm_reg(pwm_mode)
 484 show_pwm_reg(pwm_enable)
 485 show_pwm_reg(pwm)
 486
 487 static ssize_t
 488 store_pwm_mode(struct device *dev, struct device_attribute *attr,
 489                const char *buf, size_t count)
 490 {
 491         int nr = to_sensor_dev_attr(attr)->index;
 492         struct w83l786ng_data *data = dev_get_drvdata(dev);
 493         struct i2c_client *client = data->client;
 494         u8 reg;
 495         unsigned long val;
 496         int err;
 497
 498         err = kstrtoul(buf, 10, &val);
 499         if (err)
 500                 return err;
 501
 502         if (val > 1)
 503                 return -EINVAL;
 504         mutex_lock(&data->update_lock);
 505         data->pwm_mode[nr] = val;
 506         reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
 507         reg &= ~(1 << W83L786NG_PWM_MODE_SHIFT[nr]);
 508         if (!val)
 509                 reg |= 1 << W83L786NG_PWM_MODE_SHIFT[nr];
 510         w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
 511         mutex_unlock(&data->update_lock);
 512         return count;
 513 }
 514
 515 static ssize_t
 516 store_pwm(struct device *dev, struct device_attribute *attr,
 517           const char *buf, size_t count)
 518 {
 519         int nr = to_sensor_dev_attr(attr)->index;
 520         struct w83l786ng_data *data = dev_get_drvdata(dev);
 521         struct i2c_client *client = data->client;
 522         unsigned long val;
 523         int err;
 524
 525         err = kstrtoul(buf, 10, &val);
 526         if (err)
 527                 return err;
 528         val = clamp_val(val, 0, 255);
 529         val = DIV_ROUND_CLOSEST(val, 0x11);
 530
 531         mutex_lock(&data->update_lock);
 532         data->pwm[nr] = val * 0x11;
 533         val |= w83l786ng_read_value(client, W83L786NG_REG_PWM[nr]) & 0xf0;
 534         w83l786ng_write_value(client, W83L786NG_REG_PWM[nr], val);
 535         mutex_unlock(&data->update_lock);
 536         return count;
 537 }
 538
 539 static ssize_t
 540 store_pwm_enable(struct device *dev, struct device_attribute *attr,
 541                  const char *buf, size_t count)
 542 {
 543         int nr = to_sensor_dev_attr(attr)->index;
 544         struct w83l786ng_data *data = dev_get_drvdata(dev);
 545         struct i2c_client *client = data->client;
 546         u8 reg;
 547         unsigned long val;
 548         int err;
 549
 550         err = kstrtoul(buf, 10, &val);
 551         if (err)
 552                 return err;
 553
 554         if (!val || val > 2)  /* only modes 1 and 2 are supported */
 555                 return -EINVAL;
 556
 557         mutex_lock(&data->update_lock);
 558         reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
 559         data->pwm_enable[nr] = val;
 560         reg &= ~(0x03 << W83L786NG_PWM_ENABLE_SHIFT[nr]);
 561         reg |= (val - 1) << W83L786NG_PWM_ENABLE_SHIFT[nr];
 562         w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
 563         mutex_unlock(&data->update_lock);
 564         return count;
 565 }
 566
 567 static struct sensor_device_attribute sda_pwm[] = {
 568         SENSOR_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0),
 569         SENSOR_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 1),
 570 };
 571
 572 static struct sensor_device_attribute sda_pwm_mode[] = {
 573         SENSOR_ATTR(pwm1_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
 574                     store_pwm_mode, 0),
 575         SENSOR_ATTR(pwm2_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
 576                     store_pwm_mode, 1),
 577 };
 578
 579 static struct sensor_device_attribute sda_pwm_enable[] = {
 580         SENSOR_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
 581                     store_pwm_enable, 0),
 582         SENSOR_ATTR(pwm2_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
 583                     store_pwm_enable, 1),
 584 };
 585
 586 /* For Smart Fan I/Thermal Cruise and Smart Fan II */
 587 static ssize_t
 588 show_tolerance(struct device *dev, struct device_attribute *attr, char *buf)
 589 {
 590         int nr = to_sensor_dev_attr(attr)->index;
 591         struct w83l786ng_data *data = w83l786ng_update_device(dev);
 592         return sprintf(buf, "%ld\n", (long)data->tolerance[nr]);
 593 }
 594
 595 static ssize_t
 596 store_tolerance(struct device *dev, struct device_attribute *attr,
 597                 const char *buf, size_t count)
 598 {
 599         int nr = to_sensor_dev_attr(attr)->index;
 600         struct w83l786ng_data *data = dev_get_drvdata(dev);
 601         struct i2c_client *client = data->client;
 602         u8 tol_tmp, tol_mask;
 603         unsigned long val;
 604         int err;
 605
 606         err = kstrtoul(buf, 10, &val);
 607         if (err)
 608                 return err;
 609
 610         mutex_lock(&data->update_lock);
 611         tol_mask = w83l786ng_read_value(client,
 612             W83L786NG_REG_TOLERANCE) & ((nr == 1) ? 0x0f : 0xf0);
 613         tol_tmp = clamp_val(val, 0, 15);
 614         tol_tmp &= 0x0f;
 615         data->tolerance[nr] = tol_tmp;
 616         if (nr == 1)
 617                 tol_tmp <<= 4;
 618
 619         w83l786ng_write_value(client, W83L786NG_REG_TOLERANCE,
 620                               tol_mask | tol_tmp);
 621         mutex_unlock(&data->update_lock);
 622         return count;
 623 }
 624
 625 static struct sensor_device_attribute sda_tolerance[] = {
 626         SENSOR_ATTR(pwm1_tolerance, S_IWUSR | S_IRUGO,
 627                     show_tolerance, store_tolerance, 0),
 628         SENSOR_ATTR(pwm2_tolerance, S_IWUSR | S_IRUGO,
 629                     show_tolerance, store_tolerance, 1),
 630 };
 631
 632
 633 #define IN_UNIT_ATTRS(X)        \
 634         &sda_in_input[X].dev_attr.attr,         \
 635         &sda_in_min[X].dev_attr.attr,           \
 636         &sda_in_max[X].dev_attr.attr
 637
 638 #define FAN_UNIT_ATTRS(X)       \
 639         &sda_fan_input[X].dev_attr.attr,        \
 640         &sda_fan_min[X].dev_attr.attr,          \
 641         &sda_fan_div[X].dev_attr.attr
 642
 643 #define TEMP_UNIT_ATTRS(X)      \
 644         &sda_temp_input[X].dev_attr.attr,       \
 645         &sda_temp_max[X].dev_attr.attr,         \
 646         &sda_temp_max_hyst[X].dev_attr.attr
 647
 648 #define PWM_UNIT_ATTRS(X)       \
 649         &sda_pwm[X].dev_attr.attr,              \
 650         &sda_pwm_mode[X].dev_attr.attr,         \
 651         &sda_pwm_enable[X].dev_attr.attr
 652
 653 #define TOLERANCE_UNIT_ATTRS(X) \
 654         &sda_tolerance[X].dev_attr.attr
 655
 656 static struct attribute *w83l786ng_attrs[] = {
 657         IN_UNIT_ATTRS(0),
 658         IN_UNIT_ATTRS(1),
 659         IN_UNIT_ATTRS(2),
 660         FAN_UNIT_ATTRS(0),
 661         FAN_UNIT_ATTRS(1),
 662         TEMP_UNIT_ATTRS(0),
 663         TEMP_UNIT_ATTRS(1),
 664         PWM_UNIT_ATTRS(0),
 665         PWM_UNIT_ATTRS(1),
 666         TOLERANCE_UNIT_ATTRS(0),
 667         TOLERANCE_UNIT_ATTRS(1),
 668         NULL
 669 };
 670
 671 ATTRIBUTE_GROUPS(w83l786ng);
 672
 673 static int
 674 w83l786ng_detect(struct i2c_client *client, struct i2c_board_info *info)
 675 {
 676         struct i2c_adapter *adapter = client->adapter;
 677         u16 man_id;
 678         u8 chip_id;
 679
 680         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 681                 return -ENODEV;
 682
 683         /* Detection */
 684         if ((w83l786ng_read_value(client, W83L786NG_REG_CONFIG) & 0x80)) {
 685                 dev_dbg(&adapter->dev, "W83L786NG detection failed at 0x%02x\n",
 686                         client->addr);
 687                 return -ENODEV;
 688         }
 689
 690         /* Identification */
 691         man_id = (w83l786ng_read_value(client, W83L786NG_REG_MAN_ID1) << 8) +
 692                  w83l786ng_read_value(client, W83L786NG_REG_MAN_ID2);
 693         chip_id = w83l786ng_read_value(client, W83L786NG_REG_CHIP_ID);
 694
 695         if (man_id != 0x5CA3 ||         /* Winbond */
 696             chip_id != 0x80) {          /* W83L786NG */
 697                 dev_dbg(&adapter->dev,
 698                         "Unsupported chip (man_id=0x%04X, chip_id=0x%02X)\n",
 699                         man_id, chip_id);
 700                 return -ENODEV;
 701         }
 702
 703         strlcpy(info->type, "w83l786ng", I2C_NAME_SIZE);
 704
 705         return 0;
 706 }
 707
 708 static void w83l786ng_init_client(struct i2c_client *client)
 709 {
 710         u8 tmp;
 711
 712         if (reset)
 713                 w83l786ng_write_value(client, W83L786NG_REG_CONFIG, 0x80);
 714
 715         /* Start monitoring */
 716         tmp = w83l786ng_read_value(client, W83L786NG_REG_CONFIG);
 717         if (!(tmp & 0x01))
 718                 w83l786ng_write_value(client, W83L786NG_REG_CONFIG, tmp | 0x01);
 719 }
 720
 721 static int
 722 w83l786ng_probe(struct i2c_client *client, const struct i2c_device_id *id)
 723 {
 724         struct device *dev = &client->dev;
 725         struct w83l786ng_data *data;
 726         struct device *hwmon_dev;
 727         int i;
 728         u8 reg_tmp;
 729
 730         data = devm_kzalloc(dev, sizeof(struct w83l786ng_data), GFP_KERNEL);
 731         if (!data)
 732                 return -ENOMEM;
 733
 734         data->client = client;
 735         mutex_init(&data->update_lock);
 736
 737         /* Initialize the chip */
 738         w83l786ng_init_client(client);
 739
 740         /* A few vars need to be filled upon startup */
 741         for (i = 0; i < 2; i++) {
 742                 data->fan_min[i] = w83l786ng_read_value(client,
 743                     W83L786NG_REG_FAN_MIN(i));
 744         }
 745
 746         /* Update the fan divisor */
 747         reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
 748         data->fan_div[0] = reg_tmp & 0x07;
 749         data->fan_div[1] = (reg_tmp >> 4) & 0x07;
 750
 751         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 752                                                            data,
 753                                                            w83l786ng_groups);
 754         return PTR_ERR_OR_ZERO(hwmon_dev);
 755 }
 756
 757 static const struct i2c_device_id w83l786ng_id[] = {
 758         { "w83l786ng", 0 },
 759         { }
 760 };
 761 MODULE_DEVICE_TABLE(i2c, w83l786ng_id);
 762
 763 static struct i2c_driver w83l786ng_driver = {
 764         .class          = I2C_CLASS_HWMON,
 765         .driver = {
 766                    .name = "w83l786ng",
 767         },
 768         .probe          = w83l786ng_probe,
 769         .id_table       = w83l786ng_id,
 770         .detect         = w83l786ng_detect,
 771         .address_list   = normal_i2c,
 772 };
 773
 774 module_i2c_driver(w83l786ng_driver);
 775
 776 MODULE_AUTHOR("Kevin Lo");
 777 MODULE_DESCRIPTION("w83l786ng driver");
 778 MODULE_LICENSE("GPL");