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 device *hwmon_dev;
 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 int w83l786ng_probe(struct i2c_client *client,
 152                            const struct i2c_device_id *id);
 153 static int w83l786ng_detect(struct i2c_client *client,
 154                             struct i2c_board_info *info);
 155 static int w83l786ng_remove(struct i2c_client *client);
 156 static void w83l786ng_init_client(struct i2c_client *client);
 157 static struct w83l786ng_data *w83l786ng_update_device(struct device *dev);
 158
 159 static const struct i2c_device_id w83l786ng_id[] = {
 160         { "w83l786ng", 0 },
 161         { }
 162 };
 163 MODULE_DEVICE_TABLE(i2c, w83l786ng_id);
 164
 165 static struct i2c_driver w83l786ng_driver = {
 166         .class          = I2C_CLASS_HWMON,
 167         .driver = {
 168                    .name = "w83l786ng",
 169         },
 170         .probe          = w83l786ng_probe,
 171         .remove         = w83l786ng_remove,
 172         .id_table       = w83l786ng_id,
 173         .detect         = w83l786ng_detect,
 174         .address_list   = normal_i2c,
 175 };
 176
 177 static u8
 178 w83l786ng_read_value(struct i2c_client *client, u8 reg)
 179 {
 180         return i2c_smbus_read_byte_data(client, reg);
 181 }
 182
 183 static int
 184 w83l786ng_write_value(struct i2c_client *client, u8 reg, u8 value)
 185 {
 186         return i2c_smbus_write_byte_data(client, reg, value);
 187 }
 188
 189 /* following are the sysfs callback functions */
 190 #define show_in_reg(reg) \
 191 static ssize_t \
 192 show_##reg(struct device *dev, struct device_attribute *attr, \
 193            char *buf) \
 194 { \
 195         int nr = to_sensor_dev_attr(attr)->index; \
 196         struct w83l786ng_data *data = w83l786ng_update_device(dev); \
 197         return sprintf(buf, "%d\n", IN_FROM_REG(data->reg[nr])); \
 198 }
 199
 200 show_in_reg(in)
 201 show_in_reg(in_min)
 202 show_in_reg(in_max)
 203
 204 #define store_in_reg(REG, reg) \
 205 static ssize_t \
 206 store_in_##reg(struct device *dev, struct device_attribute *attr, \
 207                const char *buf, size_t count) \
 208 { \
 209         int nr = to_sensor_dev_attr(attr)->index; \
 210         struct i2c_client *client = to_i2c_client(dev); \
 211         struct w83l786ng_data *data = i2c_get_clientdata(client); \
 212         unsigned long val; \
 213         int err = kstrtoul(buf, 10, &val); \
 214         if (err) \
 215                 return err; \
 216         mutex_lock(&data->update_lock); \
 217         data->in_##reg[nr] = IN_TO_REG(val); \
 218         w83l786ng_write_value(client, W83L786NG_REG_IN_##REG(nr), \
 219                               data->in_##reg[nr]); \
 220         mutex_unlock(&data->update_lock); \
 221         return count; \
 222 }
 223
 224 store_in_reg(MIN, min)
 225 store_in_reg(MAX, max)
 226
 227 static struct sensor_device_attribute sda_in_input[] = {
 228         SENSOR_ATTR(in0_input, S_IRUGO, show_in, NULL, 0),
 229         SENSOR_ATTR(in1_input, S_IRUGO, show_in, NULL, 1),
 230         SENSOR_ATTR(in2_input, S_IRUGO, show_in, NULL, 2),
 231 };
 232
 233 static struct sensor_device_attribute sda_in_min[] = {
 234         SENSOR_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 0),
 235         SENSOR_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 1),
 236         SENSOR_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 2),
 237 };
 238
 239 static struct sensor_device_attribute sda_in_max[] = {
 240         SENSOR_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 0),
 241         SENSOR_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 1),
 242         SENSOR_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 2),
 243 };
 244
 245 #define show_fan_reg(reg) \
 246 static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
 247                           char *buf) \
 248 { \
 249         int nr = to_sensor_dev_attr(attr)->index; \
 250         struct w83l786ng_data *data = w83l786ng_update_device(dev); \
 251         return sprintf(buf, "%d\n", \
 252                 FAN_FROM_REG(data->fan[nr], DIV_FROM_REG(data->fan_div[nr]))); \
 253 }
 254
 255 show_fan_reg(fan);
 256 show_fan_reg(fan_min);
 257
 258 static ssize_t
 259 store_fan_min(struct device *dev, struct device_attribute *attr,
 260               const char *buf, size_t count)
 261 {
 262         int nr = to_sensor_dev_attr(attr)->index;
 263         struct i2c_client *client = to_i2c_client(dev);
 264         struct w83l786ng_data *data = i2c_get_clientdata(client);
 265         unsigned long val;
 266         int err;
 267
 268         err = kstrtoul(buf, 10, &val);
 269         if (err)
 270                 return err;
 271
 272         mutex_lock(&data->update_lock);
 273         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 274         w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
 275                               data->fan_min[nr]);
 276         mutex_unlock(&data->update_lock);
 277
 278         return count;
 279 }
 280
 281 static ssize_t
 282 show_fan_div(struct device *dev, struct device_attribute *attr,
 283              char *buf)
 284 {
 285         int nr = to_sensor_dev_attr(attr)->index;
 286         struct w83l786ng_data *data = w83l786ng_update_device(dev);
 287         return sprintf(buf, "%u\n", DIV_FROM_REG(data->fan_div[nr]));
 288 }
 289
 290 /*
 291  * Note: we save and restore the fan minimum here, because its value is
 292  * determined in part by the fan divisor.  This follows the principle of
 293  * least surprise; the user doesn't expect the fan minimum to change just
 294  * because the divisor changed.
 295  */
 296 static ssize_t
 297 store_fan_div(struct device *dev, struct device_attribute *attr,
 298               const char *buf, size_t count)
 299 {
 300         int nr = to_sensor_dev_attr(attr)->index;
 301         struct i2c_client *client = to_i2c_client(dev);
 302         struct w83l786ng_data *data = i2c_get_clientdata(client);
 303
 304         unsigned long min;
 305         u8 tmp_fan_div;
 306         u8 fan_div_reg;
 307         u8 keep_mask = 0;
 308         u8 new_shift = 0;
 309
 310         unsigned long val;
 311         int err;
 312
 313         err = kstrtoul(buf, 10, &val);
 314         if (err)
 315                 return err;
 316
 317         /* Save fan_min */
 318         mutex_lock(&data->update_lock);
 319         min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));
 320
 321         data->fan_div[nr] = DIV_TO_REG(val);
 322
 323         switch (nr) {
 324         case 0:
 325                 keep_mask = 0xf8;
 326                 new_shift = 0;
 327                 break;
 328         case 1:
 329                 keep_mask = 0x8f;
 330                 new_shift = 4;
 331                 break;
 332         }
 333
 334         fan_div_reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV)
 335                                            & keep_mask;
 336
 337         tmp_fan_div = (data->fan_div[nr] << new_shift) & ~keep_mask;
 338
 339         w83l786ng_write_value(client, W83L786NG_REG_FAN_DIV,
 340                               fan_div_reg | tmp_fan_div);
 341
 342         /* Restore fan_min */
 343         data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 344         w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
 345                               data->fan_min[nr]);
 346         mutex_unlock(&data->update_lock);
 347
 348         return count;
 349 }
 350
 351 static struct sensor_device_attribute sda_fan_input[] = {
 352         SENSOR_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0),
 353         SENSOR_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1),
 354 };
 355
 356 static struct sensor_device_attribute sda_fan_min[] = {
 357         SENSOR_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min,
 358                     store_fan_min, 0),
 359         SENSOR_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min,
 360                     store_fan_min, 1),
 361 };
 362
 363 static struct sensor_device_attribute sda_fan_div[] = {
 364         SENSOR_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div,
 365                     store_fan_div, 0),
 366         SENSOR_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div,
 367                     store_fan_div, 1),
 368 };
 369
 370
 371 /* read/write the temperature, includes measured value and limits */
 372
 373 static ssize_t
 374 show_temp(struct device *dev, struct device_attribute *attr, char *buf)
 375 {
 376         struct sensor_device_attribute_2 *sensor_attr =
 377             to_sensor_dev_attr_2(attr);
 378         int nr = sensor_attr->nr;
 379         int index = sensor_attr->index;
 380         struct w83l786ng_data *data = w83l786ng_update_device(dev);
 381         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr][index]));
 382 }
 383
 384 static ssize_t
 385 store_temp(struct device *dev, struct device_attribute *attr,
 386            const char *buf, size_t count)
 387 {
 388         struct sensor_device_attribute_2 *sensor_attr =
 389             to_sensor_dev_attr_2(attr);
 390         int nr = sensor_attr->nr;
 391         int index = sensor_attr->index;
 392         struct i2c_client *client = to_i2c_client(dev);
 393         struct w83l786ng_data *data = i2c_get_clientdata(client);
 394         long val;
 395         int err;
 396
 397         err = kstrtol(buf, 10, &val);
 398         if (err)
 399                 return err;
 400
 401         mutex_lock(&data->update_lock);
 402         data->temp[nr][index] = TEMP_TO_REG(val);
 403         w83l786ng_write_value(client, W83L786NG_REG_TEMP[nr][index],
 404                               data->temp[nr][index]);
 405         mutex_unlock(&data->update_lock);
 406
 407         return count;
 408 }
 409
 410 static struct sensor_device_attribute_2 sda_temp_input[] = {
 411         SENSOR_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0),
 412         SENSOR_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, 0),
 413 };
 414
 415 static struct sensor_device_attribute_2 sda_temp_max[] = {
 416         SENSOR_ATTR_2(temp1_max, S_IRUGO | S_IWUSR,
 417                       show_temp, store_temp, 0, 1),
 418         SENSOR_ATTR_2(temp2_max, S_IRUGO | S_IWUSR,
 419                       show_temp, store_temp, 1, 1),
 420 };
 421
 422 static struct sensor_device_attribute_2 sda_temp_max_hyst[] = {
 423         SENSOR_ATTR_2(temp1_max_hyst, S_IRUGO | S_IWUSR,
 424                       show_temp, store_temp, 0, 2),
 425         SENSOR_ATTR_2(temp2_max_hyst, S_IRUGO | S_IWUSR,
 426                       show_temp, store_temp, 1, 2),
 427 };
 428
 429 #define show_pwm_reg(reg) \
 430 static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
 431                           char *buf) \
 432 { \
 433         struct w83l786ng_data *data = w83l786ng_update_device(dev); \
 434         int nr = to_sensor_dev_attr(attr)->index; \
 435         return sprintf(buf, "%d\n", data->reg[nr]); \
 436 }
 437
 438 show_pwm_reg(pwm_mode)
 439 show_pwm_reg(pwm_enable)
 440 show_pwm_reg(pwm)
 441
 442 static ssize_t
 443 store_pwm_mode(struct device *dev, struct device_attribute *attr,
 444                const char *buf, size_t count)
 445 {
 446         int nr = to_sensor_dev_attr(attr)->index;
 447         struct i2c_client *client = to_i2c_client(dev);
 448         struct w83l786ng_data *data = i2c_get_clientdata(client);
 449         u8 reg;
 450         unsigned long val;
 451         int err;
 452
 453         err = kstrtoul(buf, 10, &val);
 454         if (err)
 455                 return err;
 456
 457         if (val > 1)
 458                 return -EINVAL;
 459         mutex_lock(&data->update_lock);
 460         data->pwm_mode[nr] = val;
 461         reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
 462         reg &= ~(1 << W83L786NG_PWM_MODE_SHIFT[nr]);
 463         if (!val)
 464                 reg |= 1 << W83L786NG_PWM_MODE_SHIFT[nr];
 465         w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
 466         mutex_unlock(&data->update_lock);
 467         return count;
 468 }
 469
 470 static ssize_t
 471 store_pwm(struct device *dev, struct device_attribute *attr,
 472           const char *buf, size_t count)
 473 {
 474         int nr = to_sensor_dev_attr(attr)->index;
 475         struct i2c_client *client = to_i2c_client(dev);
 476         struct w83l786ng_data *data = i2c_get_clientdata(client);
 477         unsigned long val;
 478         int err;
 479
 480         err = kstrtoul(buf, 10, &val);
 481         if (err)
 482                 return err;
 483         val = clamp_val(val, 0, 255);
 484         val = DIV_ROUND_CLOSEST(val, 0x11);
 485
 486         mutex_lock(&data->update_lock);
 487         data->pwm[nr] = val * 0x11;
 488         val |= w83l786ng_read_value(client, W83L786NG_REG_PWM[nr]) & 0xf0;
 489         w83l786ng_write_value(client, W83L786NG_REG_PWM[nr], val);
 490         mutex_unlock(&data->update_lock);
 491         return count;
 492 }
 493
 494 static ssize_t
 495 store_pwm_enable(struct device *dev, struct device_attribute *attr,
 496                  const char *buf, size_t count)
 497 {
 498         int nr = to_sensor_dev_attr(attr)->index;
 499         struct i2c_client *client = to_i2c_client(dev);
 500         struct w83l786ng_data *data = i2c_get_clientdata(client);
 501         u8 reg;
 502         unsigned long val;
 503         int err;
 504
 505         err = kstrtoul(buf, 10, &val);
 506         if (err)
 507                 return err;
 508
 509         if (!val || val > 2)  /* only modes 1 and 2 are supported */
 510                 return -EINVAL;
 511
 512         mutex_lock(&data->update_lock);
 513         reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
 514         data->pwm_enable[nr] = val;
 515         reg &= ~(0x03 << W83L786NG_PWM_ENABLE_SHIFT[nr]);
 516         reg |= (val - 1) << W83L786NG_PWM_ENABLE_SHIFT[nr];
 517         w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
 518         mutex_unlock(&data->update_lock);
 519         return count;
 520 }
 521
 522 static struct sensor_device_attribute sda_pwm[] = {
 523         SENSOR_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0),
 524         SENSOR_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 1),
 525 };
 526
 527 static struct sensor_device_attribute sda_pwm_mode[] = {
 528         SENSOR_ATTR(pwm1_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
 529                     store_pwm_mode, 0),
 530         SENSOR_ATTR(pwm2_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
 531                     store_pwm_mode, 1),
 532 };
 533
 534 static struct sensor_device_attribute sda_pwm_enable[] = {
 535         SENSOR_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
 536                     store_pwm_enable, 0),
 537         SENSOR_ATTR(pwm2_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
 538                     store_pwm_enable, 1),
 539 };
 540
 541 /* For Smart Fan I/Thermal Cruise and Smart Fan II */
 542 static ssize_t
 543 show_tolerance(struct device *dev, struct device_attribute *attr, char *buf)
 544 {
 545         int nr = to_sensor_dev_attr(attr)->index;
 546         struct w83l786ng_data *data = w83l786ng_update_device(dev);
 547         return sprintf(buf, "%ld\n", (long)data->tolerance[nr]);
 548 }
 549
 550 static ssize_t
 551 store_tolerance(struct device *dev, struct device_attribute *attr,
 552                 const char *buf, size_t count)
 553 {
 554         int nr = to_sensor_dev_attr(attr)->index;
 555         struct i2c_client *client = to_i2c_client(dev);
 556         struct w83l786ng_data *data = i2c_get_clientdata(client);
 557         u8 tol_tmp, tol_mask;
 558         unsigned long val;
 559         int err;
 560
 561         err = kstrtoul(buf, 10, &val);
 562         if (err)
 563                 return err;
 564
 565         mutex_lock(&data->update_lock);
 566         tol_mask = w83l786ng_read_value(client,
 567             W83L786NG_REG_TOLERANCE) & ((nr == 1) ? 0x0f : 0xf0);
 568         tol_tmp = clamp_val(val, 0, 15);
 569         tol_tmp &= 0x0f;
 570         data->tolerance[nr] = tol_tmp;
 571         if (nr == 1)
 572                 tol_tmp <<= 4;
 573
 574         w83l786ng_write_value(client, W83L786NG_REG_TOLERANCE,
 575                               tol_mask | tol_tmp);
 576         mutex_unlock(&data->update_lock);
 577         return count;
 578 }
 579
 580 static struct sensor_device_attribute sda_tolerance[] = {
 581         SENSOR_ATTR(pwm1_tolerance, S_IWUSR | S_IRUGO,
 582                     show_tolerance, store_tolerance, 0),
 583         SENSOR_ATTR(pwm2_tolerance, S_IWUSR | S_IRUGO,
 584                     show_tolerance, store_tolerance, 1),
 585 };
 586
 587
 588 #define IN_UNIT_ATTRS(X)        \
 589         &sda_in_input[X].dev_attr.attr,         \
 590         &sda_in_min[X].dev_attr.attr,           \
 591         &sda_in_max[X].dev_attr.attr
 592
 593 #define FAN_UNIT_ATTRS(X)       \
 594         &sda_fan_input[X].dev_attr.attr,        \
 595         &sda_fan_min[X].dev_attr.attr,          \
 596         &sda_fan_div[X].dev_attr.attr
 597
 598 #define TEMP_UNIT_ATTRS(X)      \
 599         &sda_temp_input[X].dev_attr.attr,       \
 600         &sda_temp_max[X].dev_attr.attr,         \
 601         &sda_temp_max_hyst[X].dev_attr.attr
 602
 603 #define PWM_UNIT_ATTRS(X)       \
 604         &sda_pwm[X].dev_attr.attr,              \
 605         &sda_pwm_mode[X].dev_attr.attr,         \
 606         &sda_pwm_enable[X].dev_attr.attr
 607
 608 #define TOLERANCE_UNIT_ATTRS(X) \
 609         &sda_tolerance[X].dev_attr.attr
 610
 611 static struct attribute *w83l786ng_attributes[] = {
 612         IN_UNIT_ATTRS(0),
 613         IN_UNIT_ATTRS(1),
 614         IN_UNIT_ATTRS(2),
 615         FAN_UNIT_ATTRS(0),
 616         FAN_UNIT_ATTRS(1),
 617         TEMP_UNIT_ATTRS(0),
 618         TEMP_UNIT_ATTRS(1),
 619         PWM_UNIT_ATTRS(0),
 620         PWM_UNIT_ATTRS(1),
 621         TOLERANCE_UNIT_ATTRS(0),
 622         TOLERANCE_UNIT_ATTRS(1),
 623         NULL
 624 };
 625
 626 static const struct attribute_group w83l786ng_group = {
 627         .attrs = w83l786ng_attributes,
 628 };
 629
 630 static int
 631 w83l786ng_detect(struct i2c_client *client, struct i2c_board_info *info)
 632 {
 633         struct i2c_adapter *adapter = client->adapter;
 634         u16 man_id;
 635         u8 chip_id;
 636
 637         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 638                 return -ENODEV;
 639
 640         /* Detection */
 641         if ((w83l786ng_read_value(client, W83L786NG_REG_CONFIG) & 0x80)) {
 642                 dev_dbg(&adapter->dev, "W83L786NG detection failed at 0x%02x\n",
 643                         client->addr);
 644                 return -ENODEV;
 645         }
 646
 647         /* Identification */
 648         man_id = (w83l786ng_read_value(client, W83L786NG_REG_MAN_ID1) << 8) +
 649                  w83l786ng_read_value(client, W83L786NG_REG_MAN_ID2);
 650         chip_id = w83l786ng_read_value(client, W83L786NG_REG_CHIP_ID);
 651
 652         if (man_id != 0x5CA3 ||         /* Winbond */
 653             chip_id != 0x80) {          /* W83L786NG */
 654                 dev_dbg(&adapter->dev,
 655                         "Unsupported chip (man_id=0x%04X, chip_id=0x%02X)\n",
 656                         man_id, chip_id);
 657                 return -ENODEV;
 658         }
 659
 660         strlcpy(info->type, "w83l786ng", I2C_NAME_SIZE);
 661
 662         return 0;
 663 }
 664
 665 static int
 666 w83l786ng_probe(struct i2c_client *client, const struct i2c_device_id *id)
 667 {
 668         struct device *dev = &client->dev;
 669         struct w83l786ng_data *data;
 670         int i, err = 0;
 671         u8 reg_tmp;
 672
 673         data = devm_kzalloc(&client->dev, sizeof(struct w83l786ng_data),
 674                             GFP_KERNEL);
 675         if (!data)
 676                 return -ENOMEM;
 677
 678         i2c_set_clientdata(client, data);
 679         mutex_init(&data->update_lock);
 680
 681         /* Initialize the chip */
 682         w83l786ng_init_client(client);
 683
 684         /* A few vars need to be filled upon startup */
 685         for (i = 0; i < 2; i++) {
 686                 data->fan_min[i] = w83l786ng_read_value(client,
 687                     W83L786NG_REG_FAN_MIN(i));
 688         }
 689
 690         /* Update the fan divisor */
 691         reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
 692         data->fan_div[0] = reg_tmp & 0x07;
 693         data->fan_div[1] = (reg_tmp >> 4) & 0x07;
 694
 695         /* Register sysfs hooks */
 696         err = sysfs_create_group(&client->dev.kobj, &w83l786ng_group);
 697         if (err)
 698                 goto exit_remove;
 699
 700         data->hwmon_dev = hwmon_device_register(dev);
 701         if (IS_ERR(data->hwmon_dev)) {
 702                 err = PTR_ERR(data->hwmon_dev);
 703                 goto exit_remove;
 704         }
 705
 706         return 0;
 707
 708         /* Unregister sysfs hooks */
 709
 710 exit_remove:
 711         sysfs_remove_group(&client->dev.kobj, &w83l786ng_group);
 712         return err;
 713 }
 714
 715 static int
 716 w83l786ng_remove(struct i2c_client *client)
 717 {
 718         struct w83l786ng_data *data = i2c_get_clientdata(client);
 719
 720         hwmon_device_unregister(data->hwmon_dev);
 721         sysfs_remove_group(&client->dev.kobj, &w83l786ng_group);
 722
 723         return 0;
 724 }
 725
 726 static void
 727 w83l786ng_init_client(struct i2c_client *client)
 728 {
 729         u8 tmp;
 730
 731         if (reset)
 732                 w83l786ng_write_value(client, W83L786NG_REG_CONFIG, 0x80);
 733
 734         /* Start monitoring */
 735         tmp = w83l786ng_read_value(client, W83L786NG_REG_CONFIG);
 736         if (!(tmp & 0x01))
 737                 w83l786ng_write_value(client, W83L786NG_REG_CONFIG, tmp | 0x01);
 738 }
 739
 740 static struct w83l786ng_data *w83l786ng_update_device(struct device *dev)
 741 {
 742         struct i2c_client *client = to_i2c_client(dev);
 743         struct w83l786ng_data *data = i2c_get_clientdata(client);
 744         int i, j;
 745         u8 reg_tmp, pwmcfg;
 746
 747         mutex_lock(&data->update_lock);
 748         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 749             || !data->valid) {
 750                 dev_dbg(&client->dev, "Updating w83l786ng data.\n");
 751
 752                 /* Update the voltages measured value and limits */
 753                 for (i = 0; i < 3; i++) {
 754                         data->in[i] = w83l786ng_read_value(client,
 755                             W83L786NG_REG_IN(i));
 756                         data->in_min[i] = w83l786ng_read_value(client,
 757                             W83L786NG_REG_IN_MIN(i));
 758                         data->in_max[i] = w83l786ng_read_value(client,
 759                             W83L786NG_REG_IN_MAX(i));
 760                 }
 761
 762                 /* Update the fan counts and limits */
 763                 for (i = 0; i < 2; i++) {
 764                         data->fan[i] = w83l786ng_read_value(client,
 765                             W83L786NG_REG_FAN(i));
 766                         data->fan_min[i] = w83l786ng_read_value(client,
 767                             W83L786NG_REG_FAN_MIN(i));
 768                 }
 769
 770                 /* Update the fan divisor */
 771                 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
 772                 data->fan_div[0] = reg_tmp & 0x07;
 773                 data->fan_div[1] = (reg_tmp >> 4) & 0x07;
 774
 775                 pwmcfg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
 776                 for (i = 0; i < 2; i++) {
 777                         data->pwm_mode[i] =
 778                             ((pwmcfg >> W83L786NG_PWM_MODE_SHIFT[i]) & 1)
 779                             ? 0 : 1;
 780                         data->pwm_enable[i] =
 781                             ((pwmcfg >> W83L786NG_PWM_ENABLE_SHIFT[i]) & 3) + 1;
 782                         data->pwm[i] =
 783                             (w83l786ng_read_value(client, W83L786NG_REG_PWM[i])
 784                              & 0x0f) * 0x11;
 785                 }
 786
 787
 788                 /* Update the temperature sensors */
 789                 for (i = 0; i < 2; i++) {
 790                         for (j = 0; j < 3; j++) {
 791                                 data->temp[i][j] = w83l786ng_read_value(client,
 792                                     W83L786NG_REG_TEMP[i][j]);
 793                         }
 794                 }
 795
 796                 /* Update Smart Fan I/II tolerance */
 797                 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_TOLERANCE);
 798                 data->tolerance[0] = reg_tmp & 0x0f;
 799                 data->tolerance[1] = (reg_tmp >> 4) & 0x0f;
 800
 801                 data->last_updated = jiffies;
 802                 data->valid = 1;
 803
 804         }
 805
 806         mutex_unlock(&data->update_lock);
 807
 808         return data;
 809 }
 810
 811 module_i2c_driver(w83l786ng_driver);
 812
 813 MODULE_AUTHOR("Kevin Lo");
 814 MODULE_DESCRIPTION("w83l786ng driver");
 815 MODULE_LICENSE("GPL");