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 = SENSORS_LIMIT(rpm, 1, 1000000);
  90         return SENSORS_LIMIT((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)        (SENSORS_LIMIT(((val) < 0 ? \
  99                                                 (val) + 0x100 * 1000 \
 100                                                 : (val)) / 1000, 0, 0xff))
 101 #define TEMP_FROM_REG(val)      (((val) & 0x80 ? \
 102                                   (val) - 0x100 : (val)) * 1000)
 103
 104 /*
 105  * The analog voltage inputs have 8mV LSB. Since the sysfs output is
 106  * in mV as would be measured on the chip input pin, need to just
 107  * multiply/divide by 8 to translate from/to register values.
 108  */
 109 #define IN_TO_REG(val)          (SENSORS_LIMIT((((val) + 4) / 8), 0, 255))
 110 #define IN_FROM_REG(val)        ((val) * 8)
 111
 112 #define DIV_FROM_REG(val)       (1 << (val))
 113
 114 static inline u8
 115 DIV_TO_REG(long val)
 116 {
 117         int i;
 118         val = SENSORS_LIMIT(val, 1, 128) >> 1;
 119         for (i = 0; i < 7; i++) {
 120                 if (val == 0)
 121                         break;
 122                 val >>= 1;
 123         }
 124         return (u8)i;
 125 }
 126
 127 struct w83l786ng_data {
 128         struct device *hwmon_dev;
 129         struct mutex update_lock;
 130         char valid;                     /* !=0 if following fields are valid */
 131         unsigned long last_updated;     /* In jiffies */
 132         unsigned long last_nonvolatile; /* In jiffies, last time we update the
 133                                          * nonvolatile registers */
 134
 135         u8 in[3];
 136         u8 in_max[3];
 137         u8 in_min[3];
 138         u8 fan[2];
 139         u8 fan_div[2];
 140         u8 fan_min[2];
 141         u8 temp_type[2];
 142         u8 temp[2][3];
 143         u8 pwm[2];
 144         u8 pwm_mode[2]; /* 0->DC variable voltage
 145                          * 1->PWM variable duty cycle */
 146
 147         u8 pwm_enable[2]; /* 1->manual
 148                            * 2->thermal cruise (also called SmartFan I) */
 149         u8 tolerance[2];
 150 };
 151
 152 static int w83l786ng_probe(struct i2c_client *client,
 153                            const struct i2c_device_id *id);
 154 static int w83l786ng_detect(struct i2c_client *client,
 155                             struct i2c_board_info *info);
 156 static int w83l786ng_remove(struct i2c_client *client);
 157 static void w83l786ng_init_client(struct i2c_client *client);
 158 static struct w83l786ng_data *w83l786ng_update_device(struct device *dev);
 159
 160 static const struct i2c_device_id w83l786ng_id[] = {
 161         { "w83l786ng", 0 },
 162         { }
 163 };
 164 MODULE_DEVICE_TABLE(i2c, w83l786ng_id);
 165
 166 static struct i2c_driver w83l786ng_driver = {
 167         .class          = I2C_CLASS_HWMON,
 168         .driver = {
 169                    .name = "w83l786ng",
 170         },
 171         .probe          = w83l786ng_probe,
 172         .remove         = w83l786ng_remove,
 173         .id_table       = w83l786ng_id,
 174         .detect         = w83l786ng_detect,
 175         .address_list   = normal_i2c,
 176 };
 177
 178 static u8
 179 w83l786ng_read_value(struct i2c_client *client, u8 reg)
 180 {
 181         return i2c_smbus_read_byte_data(client, reg);
 182 }
 183
 184 static int
 185 w83l786ng_write_value(struct i2c_client *client, u8 reg, u8 value)
 186 {
 187         return i2c_smbus_write_byte_data(client, reg, value);
 188 }
 189
 190 /* following are the sysfs callback functions */
 191 #define show_in_reg(reg) \
 192 static ssize_t \
 193 show_##reg(struct device *dev, struct device_attribute *attr, \
 194            char *buf) \
 195 { \
 196         int nr = to_sensor_dev_attr(attr)->index; \
 197         struct w83l786ng_data *data = w83l786ng_update_device(dev); \
 198         return sprintf(buf, "%d\n", IN_FROM_REG(data->reg[nr])); \
 199 }
 200
 201 show_in_reg(in)
 202 show_in_reg(in_min)
 203 show_in_reg(in_max)
 204
 205 #define store_in_reg(REG, reg) \
 206 static ssize_t \
 207 store_in_##reg(struct device *dev, struct device_attribute *attr, \
 208                const char *buf, size_t count) \
 209 { \
 210         int nr = to_sensor_dev_attr(attr)->index; \
 211         struct i2c_client *client = to_i2c_client(dev); \
 212         struct w83l786ng_data *data = i2c_get_clientdata(client); \
 213         unsigned long val; \
 214         int err = kstrtoul(buf, 10, &val); \
 215         if (err) \
 216                 return err; \
 217         mutex_lock(&data->update_lock); \
 218         data->in_##reg[nr] = IN_TO_REG(val); \
 219         w83l786ng_write_value(client, W83L786NG_REG_IN_##REG(nr), \
 220                               data->in_##reg[nr]); \
 221         mutex_unlock(&data->update_lock); \
 222         return count; \
 223 }
 224
 225 store_in_reg(MIN, min)
 226 store_in_reg(MAX, max)
 227
 228 static struct sensor_device_attribute sda_in_input[] = {
 229         SENSOR_ATTR(in0_input, S_IRUGO, show_in, NULL, 0),
 230         SENSOR_ATTR(in1_input, S_IRUGO, show_in, NULL, 1),
 231         SENSOR_ATTR(in2_input, S_IRUGO, show_in, NULL, 2),
 232 };
 233
 234 static struct sensor_device_attribute sda_in_min[] = {
 235         SENSOR_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 0),
 236         SENSOR_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 1),
 237         SENSOR_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 2),
 238 };
 239
 240 static struct sensor_device_attribute sda_in_max[] = {
 241         SENSOR_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 0),
 242         SENSOR_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 1),
 243         SENSOR_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 2),
 244 };
 245
 246 #define show_fan_reg(reg) \
 247 static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
 248                           char *buf) \
 249 { \
 250         int nr = to_sensor_dev_attr(attr)->index; \
 251         struct w83l786ng_data *data = w83l786ng_update_device(dev); \
 252         return sprintf(buf, "%d\n", \
 253                 FAN_FROM_REG(data->fan[nr], DIV_FROM_REG(data->fan_div[nr]))); \
 254 }
 255
 256 show_fan_reg(fan);
 257 show_fan_reg(fan_min);
 258
 259 static ssize_t
 260 store_fan_min(struct device *dev, struct device_attribute *attr,
 261               const char *buf, size_t count)
 262 {
 263         int nr = to_sensor_dev_attr(attr)->index;
 264         struct i2c_client *client = to_i2c_client(dev);
 265         struct w83l786ng_data *data = i2c_get_clientdata(client);
 266         unsigned long val;
 267         int err;
 268
 269         err = kstrtoul(buf, 10, &val);
 270         if (err)
 271                 return err;
 272
 273         mutex_lock(&data->update_lock);
 274         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 275         w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
 276                               data->fan_min[nr]);
 277         mutex_unlock(&data->update_lock);
 278
 279         return count;
 280 }
 281
 282 static ssize_t
 283 show_fan_div(struct device *dev, struct device_attribute *attr,
 284              char *buf)
 285 {
 286         int nr = to_sensor_dev_attr(attr)->index;
 287         struct w83l786ng_data *data = w83l786ng_update_device(dev);
 288         return sprintf(buf, "%u\n", DIV_FROM_REG(data->fan_div[nr]));
 289 }
 290
 291 /*
 292  * Note: we save and restore the fan minimum here, because its value is
 293  * determined in part by the fan divisor.  This follows the principle of
 294  * least surprise; the user doesn't expect the fan minimum to change just
 295  * because the divisor changed.
 296  */
 297 static ssize_t
 298 store_fan_div(struct device *dev, struct device_attribute *attr,
 299               const char *buf, size_t count)
 300 {
 301         int nr = to_sensor_dev_attr(attr)->index;
 302         struct i2c_client *client = to_i2c_client(dev);
 303         struct w83l786ng_data *data = i2c_get_clientdata(client);
 304
 305         unsigned long min;
 306         u8 tmp_fan_div;
 307         u8 fan_div_reg;
 308         u8 keep_mask = 0;
 309         u8 new_shift = 0;
 310
 311         unsigned long val;
 312         int err;
 313
 314         err = kstrtoul(buf, 10, &val);
 315         if (err)
 316                 return err;
 317
 318         /* Save fan_min */
 319         mutex_lock(&data->update_lock);
 320         min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));
 321
 322         data->fan_div[nr] = DIV_TO_REG(val);
 323
 324         switch (nr) {
 325         case 0:
 326                 keep_mask = 0xf8;
 327                 new_shift = 0;
 328                 break;
 329         case 1:
 330                 keep_mask = 0x8f;
 331                 new_shift = 4;
 332                 break;
 333         }
 334
 335         fan_div_reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV)
 336                                            & keep_mask;
 337
 338         tmp_fan_div = (data->fan_div[nr] << new_shift) & ~keep_mask;
 339
 340         w83l786ng_write_value(client, W83L786NG_REG_FAN_DIV,
 341                               fan_div_reg | tmp_fan_div);
 342
 343         /* Restore fan_min */
 344         data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 345         w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
 346                               data->fan_min[nr]);
 347         mutex_unlock(&data->update_lock);
 348
 349         return count;
 350 }
 351
 352 static struct sensor_device_attribute sda_fan_input[] = {
 353         SENSOR_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0),
 354         SENSOR_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1),
 355 };
 356
 357 static struct sensor_device_attribute sda_fan_min[] = {
 358         SENSOR_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min,
 359                     store_fan_min, 0),
 360         SENSOR_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min,
 361                     store_fan_min, 1),
 362 };
 363
 364 static struct sensor_device_attribute sda_fan_div[] = {
 365         SENSOR_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div,
 366                     store_fan_div, 0),
 367         SENSOR_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div,
 368                     store_fan_div, 1),
 369 };
 370
 371
 372 /* read/write the temperature, includes measured value and limits */
 373
 374 static ssize_t
 375 show_temp(struct device *dev, struct device_attribute *attr, char *buf)
 376 {
 377         struct sensor_device_attribute_2 *sensor_attr =
 378             to_sensor_dev_attr_2(attr);
 379         int nr = sensor_attr->nr;
 380         int index = sensor_attr->index;
 381         struct w83l786ng_data *data = w83l786ng_update_device(dev);
 382         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr][index]));
 383 }
 384
 385 static ssize_t
 386 store_temp(struct device *dev, struct device_attribute *attr,
 387            const char *buf, size_t count)
 388 {
 389         struct sensor_device_attribute_2 *sensor_attr =
 390             to_sensor_dev_attr_2(attr);
 391         int nr = sensor_attr->nr;
 392         int index = sensor_attr->index;
 393         struct i2c_client *client = to_i2c_client(dev);
 394         struct w83l786ng_data *data = i2c_get_clientdata(client);
 395         long val;
 396         int err;
 397
 398         err = kstrtol(buf, 10, &val);
 399         if (err)
 400                 return err;
 401
 402         mutex_lock(&data->update_lock);
 403         data->temp[nr][index] = TEMP_TO_REG(val);
 404         w83l786ng_write_value(client, W83L786NG_REG_TEMP[nr][index],
 405                               data->temp[nr][index]);
 406         mutex_unlock(&data->update_lock);
 407
 408         return count;
 409 }
 410
 411 static struct sensor_device_attribute_2 sda_temp_input[] = {
 412         SENSOR_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0),
 413         SENSOR_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, 0),
 414 };
 415
 416 static struct sensor_device_attribute_2 sda_temp_max[] = {
 417         SENSOR_ATTR_2(temp1_max, S_IRUGO | S_IWUSR,
 418                       show_temp, store_temp, 0, 1),
 419         SENSOR_ATTR_2(temp2_max, S_IRUGO | S_IWUSR,
 420                       show_temp, store_temp, 1, 1),
 421 };
 422
 423 static struct sensor_device_attribute_2 sda_temp_max_hyst[] = {
 424         SENSOR_ATTR_2(temp1_max_hyst, S_IRUGO | S_IWUSR,
 425                       show_temp, store_temp, 0, 2),
 426         SENSOR_ATTR_2(temp2_max_hyst, S_IRUGO | S_IWUSR,
 427                       show_temp, store_temp, 1, 2),
 428 };
 429
 430 #define show_pwm_reg(reg) \
 431 static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
 432                           char *buf) \
 433 { \
 434         struct w83l786ng_data *data = w83l786ng_update_device(dev); \
 435         int nr = to_sensor_dev_attr(attr)->index; \
 436         return sprintf(buf, "%d\n", data->reg[nr]); \
 437 }
 438
 439 show_pwm_reg(pwm_mode)
 440 show_pwm_reg(pwm_enable)
 441 show_pwm_reg(pwm)
 442
 443 static ssize_t
 444 store_pwm_mode(struct device *dev, struct device_attribute *attr,
 445                const char *buf, size_t count)
 446 {
 447         int nr = to_sensor_dev_attr(attr)->index;
 448         struct i2c_client *client = to_i2c_client(dev);
 449         struct w83l786ng_data *data = i2c_get_clientdata(client);
 450         u8 reg;
 451         unsigned long val;
 452         int err;
 453
 454         err = kstrtoul(buf, 10, &val);
 455         if (err)
 456                 return err;
 457
 458         if (val > 1)
 459                 return -EINVAL;
 460         mutex_lock(&data->update_lock);
 461         data->pwm_mode[nr] = val;
 462         reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
 463         reg &= ~(1 << W83L786NG_PWM_MODE_SHIFT[nr]);
 464         if (!val)
 465                 reg |= 1 << W83L786NG_PWM_MODE_SHIFT[nr];
 466         w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
 467         mutex_unlock(&data->update_lock);
 468         return count;
 469 }
 470
 471 static ssize_t
 472 store_pwm(struct device *dev, struct device_attribute *attr,
 473           const char *buf, size_t count)
 474 {
 475         int nr = to_sensor_dev_attr(attr)->index;
 476         struct i2c_client *client = to_i2c_client(dev);
 477         struct w83l786ng_data *data = i2c_get_clientdata(client);
 478         unsigned long val;
 479         int err;
 480
 481         err = kstrtoul(buf, 10, &val);
 482         if (err)
 483                 return err;
 484         val = SENSORS_LIMIT(val, 0, 255);
 485
 486         mutex_lock(&data->update_lock);
 487         data->pwm[nr] = val;
 488         w83l786ng_write_value(client, W83L786NG_REG_PWM[nr], val);
 489         mutex_unlock(&data->update_lock);
 490         return count;
 491 }
 492
 493 static ssize_t
 494 store_pwm_enable(struct device *dev, struct device_attribute *attr,
 495                  const char *buf, size_t count)
 496 {
 497         int nr = to_sensor_dev_attr(attr)->index;
 498         struct i2c_client *client = to_i2c_client(dev);
 499         struct w83l786ng_data *data = i2c_get_clientdata(client);
 500         u8 reg;
 501         unsigned long val;
 502         int err;
 503
 504         err = kstrtoul(buf, 10, &val);
 505         if (err)
 506                 return err;
 507
 508         if (!val || val > 2)  /* only modes 1 and 2 are supported */
 509                 return -EINVAL;
 510
 511         mutex_lock(&data->update_lock);
 512         reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
 513         data->pwm_enable[nr] = val;
 514         reg &= ~(0x02 << W83L786NG_PWM_ENABLE_SHIFT[nr]);
 515         reg |= (val - 1) << W83L786NG_PWM_ENABLE_SHIFT[nr];
 516         w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
 517         mutex_unlock(&data->update_lock);
 518         return count;
 519 }
 520
 521 static struct sensor_device_attribute sda_pwm[] = {
 522         SENSOR_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0),
 523         SENSOR_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 1),
 524 };
 525
 526 static struct sensor_device_attribute sda_pwm_mode[] = {
 527         SENSOR_ATTR(pwm1_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
 528                     store_pwm_mode, 0),
 529         SENSOR_ATTR(pwm2_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
 530                     store_pwm_mode, 1),
 531 };
 532
 533 static struct sensor_device_attribute sda_pwm_enable[] = {
 534         SENSOR_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
 535                     store_pwm_enable, 0),
 536         SENSOR_ATTR(pwm2_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
 537                     store_pwm_enable, 1),
 538 };
 539
 540 /* For Smart Fan I/Thermal Cruise and Smart Fan II */
 541 static ssize_t
 542 show_tolerance(struct device *dev, struct device_attribute *attr, char *buf)
 543 {
 544         int nr = to_sensor_dev_attr(attr)->index;
 545         struct w83l786ng_data *data = w83l786ng_update_device(dev);
 546         return sprintf(buf, "%ld\n", (long)data->tolerance[nr]);
 547 }
 548
 549 static ssize_t
 550 store_tolerance(struct device *dev, struct device_attribute *attr,
 551                 const char *buf, size_t count)
 552 {
 553         int nr = to_sensor_dev_attr(attr)->index;
 554         struct i2c_client *client = to_i2c_client(dev);
 555         struct w83l786ng_data *data = i2c_get_clientdata(client);
 556         u8 tol_tmp, tol_mask;
 557         unsigned long val;
 558         int err;
 559
 560         err = kstrtoul(buf, 10, &val);
 561         if (err)
 562                 return err;
 563
 564         mutex_lock(&data->update_lock);
 565         tol_mask = w83l786ng_read_value(client,
 566             W83L786NG_REG_TOLERANCE) & ((nr == 1) ? 0x0f : 0xf0);
 567         tol_tmp = SENSORS_LIMIT(val, 0, 15);
 568         tol_tmp &= 0x0f;
 569         data->tolerance[nr] = tol_tmp;
 570         if (nr == 1)
 571                 tol_tmp <<= 4;
 572
 573         w83l786ng_write_value(client, W83L786NG_REG_TOLERANCE,
 574                               tol_mask | tol_tmp);
 575         mutex_unlock(&data->update_lock);
 576         return count;
 577 }
 578
 579 static struct sensor_device_attribute sda_tolerance[] = {
 580         SENSOR_ATTR(pwm1_tolerance, S_IWUSR | S_IRUGO,
 581                     show_tolerance, store_tolerance, 0),
 582         SENSOR_ATTR(pwm2_tolerance, S_IWUSR | S_IRUGO,
 583                     show_tolerance, store_tolerance, 1),
 584 };
 585
 586
 587 #define IN_UNIT_ATTRS(X)        \
 588         &sda_in_input[X].dev_attr.attr,         \
 589         &sda_in_min[X].dev_attr.attr,           \
 590         &sda_in_max[X].dev_attr.attr
 591
 592 #define FAN_UNIT_ATTRS(X)       \
 593         &sda_fan_input[X].dev_attr.attr,        \
 594         &sda_fan_min[X].dev_attr.attr,          \
 595         &sda_fan_div[X].dev_attr.attr
 596
 597 #define TEMP_UNIT_ATTRS(X)      \
 598         &sda_temp_input[X].dev_attr.attr,       \
 599         &sda_temp_max[X].dev_attr.attr,         \
 600         &sda_temp_max_hyst[X].dev_attr.attr
 601
 602 #define PWM_UNIT_ATTRS(X)       \
 603         &sda_pwm[X].dev_attr.attr,              \
 604         &sda_pwm_mode[X].dev_attr.attr,         \
 605         &sda_pwm_enable[X].dev_attr.attr
 606
 607 #define TOLERANCE_UNIT_ATTRS(X) \
 608         &sda_tolerance[X].dev_attr.attr
 609
 610 static struct attribute *w83l786ng_attributes[] = {
 611         IN_UNIT_ATTRS(0),
 612         IN_UNIT_ATTRS(1),
 613         IN_UNIT_ATTRS(2),
 614         FAN_UNIT_ATTRS(0),
 615         FAN_UNIT_ATTRS(1),
 616         TEMP_UNIT_ATTRS(0),
 617         TEMP_UNIT_ATTRS(1),
 618         PWM_UNIT_ATTRS(0),
 619         PWM_UNIT_ATTRS(1),
 620         TOLERANCE_UNIT_ATTRS(0),
 621         TOLERANCE_UNIT_ATTRS(1),
 622         NULL
 623 };
 624
 625 static const struct attribute_group w83l786ng_group = {
 626         .attrs = w83l786ng_attributes,
 627 };
 628
 629 static int
 630 w83l786ng_detect(struct i2c_client *client, struct i2c_board_info *info)
 631 {
 632         struct i2c_adapter *adapter = client->adapter;
 633         u16 man_id;
 634         u8 chip_id;
 635
 636         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 637                 return -ENODEV;
 638
 639         /* Detection */
 640         if ((w83l786ng_read_value(client, W83L786NG_REG_CONFIG) & 0x80)) {
 641                 dev_dbg(&adapter->dev, "W83L786NG detection failed at 0x%02x\n",
 642                         client->addr);
 643                 return -ENODEV;
 644         }
 645
 646         /* Identification */
 647         man_id = (w83l786ng_read_value(client, W83L786NG_REG_MAN_ID1) << 8) +
 648                  w83l786ng_read_value(client, W83L786NG_REG_MAN_ID2);
 649         chip_id = w83l786ng_read_value(client, W83L786NG_REG_CHIP_ID);
 650
 651         if (man_id != 0x5CA3 ||         /* Winbond */
 652             chip_id != 0x80) {          /* W83L786NG */
 653                 dev_dbg(&adapter->dev,
 654                         "Unsupported chip (man_id=0x%04X, chip_id=0x%02X)\n",
 655                         man_id, chip_id);
 656                 return -ENODEV;
 657         }
 658
 659         strlcpy(info->type, "w83l786ng", I2C_NAME_SIZE);
 660
 661         return 0;
 662 }
 663
 664 static int
 665 w83l786ng_probe(struct i2c_client *client, const struct i2c_device_id *id)
 666 {
 667         struct device *dev = &client->dev;
 668         struct w83l786ng_data *data;
 669         int i, err = 0;
 670         u8 reg_tmp;
 671
 672         data = devm_kzalloc(&client->dev, sizeof(struct w83l786ng_data),
 673                             GFP_KERNEL);
 674         if (!data)
 675                 return -ENOMEM;
 676
 677         i2c_set_clientdata(client, data);
 678         mutex_init(&data->update_lock);
 679
 680         /* Initialize the chip */
 681         w83l786ng_init_client(client);
 682
 683         /* A few vars need to be filled upon startup */
 684         for (i = 0; i < 2; i++) {
 685                 data->fan_min[i] = w83l786ng_read_value(client,
 686                     W83L786NG_REG_FAN_MIN(i));
 687         }
 688
 689         /* Update the fan divisor */
 690         reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
 691         data->fan_div[0] = reg_tmp & 0x07;
 692         data->fan_div[1] = (reg_tmp >> 4) & 0x07;
 693
 694         /* Register sysfs hooks */
 695         err = sysfs_create_group(&client->dev.kobj, &w83l786ng_group);
 696         if (err)
 697                 goto exit_remove;
 698
 699         data->hwmon_dev = hwmon_device_register(dev);
 700         if (IS_ERR(data->hwmon_dev)) {
 701                 err = PTR_ERR(data->hwmon_dev);
 702                 goto exit_remove;
 703         }
 704
 705         return 0;
 706
 707         /* Unregister sysfs hooks */
 708
 709 exit_remove:
 710         sysfs_remove_group(&client->dev.kobj, &w83l786ng_group);
 711         return err;
 712 }
 713
 714 static int
 715 w83l786ng_remove(struct i2c_client *client)
 716 {
 717         struct w83l786ng_data *data = i2c_get_clientdata(client);
 718
 719         hwmon_device_unregister(data->hwmon_dev);
 720         sysfs_remove_group(&client->dev.kobj, &w83l786ng_group);
 721
 722         return 0;
 723 }
 724
 725 static void
 726 w83l786ng_init_client(struct i2c_client *client)
 727 {
 728         u8 tmp;
 729
 730         if (reset)
 731                 w83l786ng_write_value(client, W83L786NG_REG_CONFIG, 0x80);
 732
 733         /* Start monitoring */
 734         tmp = w83l786ng_read_value(client, W83L786NG_REG_CONFIG);
 735         if (!(tmp & 0x01))
 736                 w83l786ng_write_value(client, W83L786NG_REG_CONFIG, tmp | 0x01);
 737 }
 738
 739 static struct w83l786ng_data *w83l786ng_update_device(struct device *dev)
 740 {
 741         struct i2c_client *client = to_i2c_client(dev);
 742         struct w83l786ng_data *data = i2c_get_clientdata(client);
 743         int i, j;
 744         u8 reg_tmp, pwmcfg;
 745
 746         mutex_lock(&data->update_lock);
 747         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 748             || !data->valid) {
 749                 dev_dbg(&client->dev, "Updating w83l786ng data.\n");
 750
 751                 /* Update the voltages measured value and limits */
 752                 for (i = 0; i < 3; i++) {
 753                         data->in[i] = w83l786ng_read_value(client,
 754                             W83L786NG_REG_IN(i));
 755                         data->in_min[i] = w83l786ng_read_value(client,
 756                             W83L786NG_REG_IN_MIN(i));
 757                         data->in_max[i] = w83l786ng_read_value(client,
 758                             W83L786NG_REG_IN_MAX(i));
 759                 }
 760
 761                 /* Update the fan counts and limits */
 762                 for (i = 0; i < 2; i++) {
 763                         data->fan[i] = w83l786ng_read_value(client,
 764                             W83L786NG_REG_FAN(i));
 765                         data->fan_min[i] = w83l786ng_read_value(client,
 766                             W83L786NG_REG_FAN_MIN(i));
 767                 }
 768
 769                 /* Update the fan divisor */
 770                 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
 771                 data->fan_div[0] = reg_tmp & 0x07;
 772                 data->fan_div[1] = (reg_tmp >> 4) & 0x07;
 773
 774                 pwmcfg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
 775                 for (i = 0; i < 2; i++) {
 776                         data->pwm_mode[i] =
 777                             ((pwmcfg >> W83L786NG_PWM_MODE_SHIFT[i]) & 1)
 778                             ? 0 : 1;
 779                         data->pwm_enable[i] =
 780                             ((pwmcfg >> W83L786NG_PWM_ENABLE_SHIFT[i]) & 2) + 1;
 781                         data->pwm[i] = w83l786ng_read_value(client,
 782                             W83L786NG_REG_PWM[i]);
 783                 }
 784
 785
 786                 /* Update the temperature sensors */
 787                 for (i = 0; i < 2; i++) {
 788                         for (j = 0; j < 3; j++) {
 789                                 data->temp[i][j] = w83l786ng_read_value(client,
 790                                     W83L786NG_REG_TEMP[i][j]);
 791                         }
 792                 }
 793
 794                 /* Update Smart Fan I/II tolerance */
 795                 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_TOLERANCE);
 796                 data->tolerance[0] = reg_tmp & 0x0f;
 797                 data->tolerance[1] = (reg_tmp >> 4) & 0x0f;
 798
 799                 data->last_updated = jiffies;
 800                 data->valid = 1;
 801
 802         }
 803
 804         mutex_unlock(&data->update_lock);
 805
 806         return data;
 807 }
 808
 809 module_i2c_driver(w83l786ng_driver);
 810
 811 MODULE_AUTHOR("Kevin Lo");
 812 MODULE_DESCRIPTION("w83l786ng driver");
 813 MODULE_LICENSE("GPL");