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
  37 /* Addresses to scan */
  38 static const unsigned short normal_i2c[] = { 0x2e, 0x2f, I2C_CLIENT_END };
  39
  40 /* Insmod parameters */
  41 I2C_CLIENT_INSMOD_1(w83l786ng);
  42
  43 static int 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 ? (val)+0x100*1000 \
  99                                     : (val)) / 1000, 0, 0xff))
 100 #define TEMP_FROM_REG(val)      (((val) & 0x80 ? (val)-0x100 : (val)) * 1000)
 101
 102 /* The analog voltage inputs have 8mV LSB. Since the sysfs output is
 103    in mV as would be measured on the chip input pin, need to just
 104    multiply/divide by 8 to translate from/to register values. */
 105 #define IN_TO_REG(val)          (SENSORS_LIMIT((((val) + 4) / 8), 0, 255))
 106 #define IN_FROM_REG(val)        ((val) * 8)
 107
 108 #define DIV_FROM_REG(val)       (1 << (val))
 109
 110 static inline u8
 111 DIV_TO_REG(long val)
 112 {
 113         int i;
 114         val = SENSORS_LIMIT(val, 1, 128) >> 1;
 115         for (i = 0; i < 7; i++) {
 116                 if (val == 0)
 117                         break;
 118                 val >>= 1;
 119         }
 120         return ((u8) i);
 121 }
 122
 123 struct w83l786ng_data {
 124         struct device *hwmon_dev;
 125         struct mutex update_lock;
 126         char valid;                     /* !=0 if following fields are valid */
 127         unsigned long last_updated;     /* In jiffies */
 128         unsigned long last_nonvolatile; /* In jiffies, last time we update the
 129                                            nonvolatile registers */
 130
 131         u8 in[3];
 132         u8 in_max[3];
 133         u8 in_min[3];
 134         u8 fan[2];
 135         u8 fan_div[2];
 136         u8 fan_min[2];
 137         u8 temp_type[2];
 138         u8 temp[2][3];
 139         u8 pwm[2];
 140         u8 pwm_mode[2]; /* 0->DC variable voltage
 141                            1->PWM variable duty cycle */
 142
 143         u8 pwm_enable[2]; /* 1->manual
 144                              2->thermal cruise (also called SmartFan I) */
 145         u8 tolerance[2];
 146 };
 147
 148 static int w83l786ng_probe(struct i2c_client *client,
 149                            const struct i2c_device_id *id);
 150 static int w83l786ng_detect(struct i2c_client *client, int kind,
 151                             struct i2c_board_info *info);
 152 static int w83l786ng_remove(struct i2c_client *client);
 153 static void w83l786ng_init_client(struct i2c_client *client);
 154 static struct w83l786ng_data *w83l786ng_update_device(struct device *dev);
 155
 156 static const struct i2c_device_id w83l786ng_id[] = {
 157         { "w83l786ng", w83l786ng },
 158         { }
 159 };
 160 MODULE_DEVICE_TABLE(i2c, w83l786ng_id);
 161
 162 static struct i2c_driver w83l786ng_driver = {
 163         .class          = I2C_CLASS_HWMON,
 164         .driver = {
 165                    .name = "w83l786ng",
 166         },
 167         .probe          = w83l786ng_probe,
 168         .remove         = w83l786ng_remove,
 169         .id_table       = w83l786ng_id,
 170         .detect         = w83l786ng_detect,
 171         .address_data   = &addr_data,
 172 };
 173
 174 static u8
 175 w83l786ng_read_value(struct i2c_client *client, u8 reg)
 176 {
 177         return i2c_smbus_read_byte_data(client, reg);
 178 }
 179
 180 static int
 181 w83l786ng_write_value(struct i2c_client *client, u8 reg, u8 value)
 182 {
 183         return i2c_smbus_write_byte_data(client, reg, value);
 184 }
 185
 186 /* following are the sysfs callback functions */
 187 #define show_in_reg(reg) \
 188 static ssize_t \
 189 show_##reg(struct device *dev, struct device_attribute *attr, \
 190            char *buf) \
 191 { \
 192         int nr = to_sensor_dev_attr(attr)->index; \
 193         struct w83l786ng_data *data = w83l786ng_update_device(dev); \
 194         return sprintf(buf,"%d\n", IN_FROM_REG(data->reg[nr])); \
 195 }
 196
 197 show_in_reg(in)
 198 show_in_reg(in_min)
 199 show_in_reg(in_max)
 200
 201 #define store_in_reg(REG, reg) \
 202 static ssize_t \
 203 store_in_##reg (struct device *dev, struct device_attribute *attr, \
 204                 const char *buf, size_t count) \
 205 { \
 206         int nr = to_sensor_dev_attr(attr)->index; \
 207         struct i2c_client *client = to_i2c_client(dev); \
 208         struct w83l786ng_data *data = i2c_get_clientdata(client); \
 209         unsigned long val = simple_strtoul(buf, NULL, 10); \
 210         mutex_lock(&data->update_lock); \
 211         data->in_##reg[nr] = IN_TO_REG(val); \
 212         w83l786ng_write_value(client, W83L786NG_REG_IN_##REG(nr), \
 213                               data->in_##reg[nr]); \
 214         mutex_unlock(&data->update_lock); \
 215         return count; \
 216 }
 217
 218 store_in_reg(MIN, min)
 219 store_in_reg(MAX, max)
 220
 221 static struct sensor_device_attribute sda_in_input[] = {
 222         SENSOR_ATTR(in0_input, S_IRUGO, show_in, NULL, 0),
 223         SENSOR_ATTR(in1_input, S_IRUGO, show_in, NULL, 1),
 224         SENSOR_ATTR(in2_input, S_IRUGO, show_in, NULL, 2),
 225 };
 226
 227 static struct sensor_device_attribute sda_in_min[] = {
 228         SENSOR_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 0),
 229         SENSOR_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 1),
 230         SENSOR_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 2),
 231 };
 232
 233 static struct sensor_device_attribute sda_in_max[] = {
 234         SENSOR_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 0),
 235         SENSOR_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 1),
 236         SENSOR_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 2),
 237 };
 238
 239 #define show_fan_reg(reg) \
 240 static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
 241                           char *buf) \
 242 { \
 243         int nr = to_sensor_dev_attr(attr)->index; \
 244         struct w83l786ng_data *data = w83l786ng_update_device(dev); \
 245         return sprintf(buf,"%d\n", \
 246                 FAN_FROM_REG(data->fan[nr], DIV_FROM_REG(data->fan_div[nr]))); \
 247 }
 248
 249 show_fan_reg(fan);
 250 show_fan_reg(fan_min);
 251
 252 static ssize_t
 253 store_fan_min(struct device *dev, struct device_attribute *attr,
 254               const char *buf, size_t count)
 255 {
 256         int nr = to_sensor_dev_attr(attr)->index;
 257         struct i2c_client *client = to_i2c_client(dev);
 258         struct w83l786ng_data *data = i2c_get_clientdata(client);
 259         u32 val;
 260
 261         val = simple_strtoul(buf, NULL, 10);
 262         mutex_lock(&data->update_lock);
 263         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 264         w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
 265                               data->fan_min[nr]);
 266         mutex_unlock(&data->update_lock);
 267
 268         return count;
 269 }
 270
 271 static ssize_t
 272 show_fan_div(struct device *dev, struct device_attribute *attr,
 273              char *buf)
 274 {
 275         int nr = to_sensor_dev_attr(attr)->index;
 276         struct w83l786ng_data *data = w83l786ng_update_device(dev);
 277         return sprintf(buf, "%u\n", DIV_FROM_REG(data->fan_div[nr]));
 278 }
 279
 280 /* Note: we save and restore the fan minimum here, because its value is
 281    determined in part by the fan divisor.  This follows the principle of
 282    least surprise; the user doesn't expect the fan minimum to change just
 283    because the divisor changed. */
 284 static ssize_t
 285 store_fan_div(struct device *dev, struct device_attribute *attr,
 286               const char *buf, size_t count)
 287 {
 288         int nr = to_sensor_dev_attr(attr)->index;
 289         struct i2c_client *client = to_i2c_client(dev);
 290         struct w83l786ng_data *data = i2c_get_clientdata(client);
 291
 292         unsigned long min;
 293         u8 tmp_fan_div;
 294         u8 fan_div_reg;
 295         u8 keep_mask = 0;
 296         u8 new_shift = 0;
 297
 298         /* Save fan_min */
 299         mutex_lock(&data->update_lock);
 300         min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));
 301
 302         data->fan_div[nr] = DIV_TO_REG(simple_strtoul(buf, NULL, 10));
 303
 304         switch (nr) {
 305         case 0:
 306                 keep_mask = 0xf8;
 307                 new_shift = 0;
 308                 break;
 309         case 1:
 310                 keep_mask = 0x8f;
 311                 new_shift = 4;
 312                 break;
 313         }
 314
 315         fan_div_reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV)
 316                                            & keep_mask;
 317
 318         tmp_fan_div = (data->fan_div[nr] << new_shift) & ~keep_mask;
 319
 320         w83l786ng_write_value(client, W83L786NG_REG_FAN_DIV,
 321                               fan_div_reg | tmp_fan_div);
 322
 323         /* Restore fan_min */
 324         data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 325         w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
 326                               data->fan_min[nr]);
 327         mutex_unlock(&data->update_lock);
 328
 329         return count;
 330 }
 331
 332 static struct sensor_device_attribute sda_fan_input[] = {
 333         SENSOR_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0),
 334         SENSOR_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1),
 335 };
 336
 337 static struct sensor_device_attribute sda_fan_min[] = {
 338         SENSOR_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min,
 339                     store_fan_min, 0),
 340         SENSOR_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min,
 341                     store_fan_min, 1),
 342 };
 343
 344 static struct sensor_device_attribute sda_fan_div[] = {
 345         SENSOR_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div,
 346                     store_fan_div, 0),
 347         SENSOR_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div,
 348                     store_fan_div, 1),
 349 };
 350
 351
 352 /* read/write the temperature, includes measured value and limits */
 353
 354 static ssize_t
 355 show_temp(struct device *dev, struct device_attribute *attr, char *buf)
 356 {
 357         struct sensor_device_attribute_2 *sensor_attr =
 358             to_sensor_dev_attr_2(attr);
 359         int nr = sensor_attr->nr;
 360         int index = sensor_attr->index;
 361         struct w83l786ng_data *data = w83l786ng_update_device(dev);
 362         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr][index]));
 363 }
 364
 365 static ssize_t
 366 store_temp(struct device *dev, struct device_attribute *attr,
 367            const char *buf, size_t count)
 368 {
 369         struct sensor_device_attribute_2 *sensor_attr =
 370             to_sensor_dev_attr_2(attr);
 371         int nr = sensor_attr->nr;
 372         int index = sensor_attr->index;
 373         struct i2c_client *client = to_i2c_client(dev);
 374         struct w83l786ng_data *data = i2c_get_clientdata(client);
 375         s32 val;
 376
 377         val = simple_strtol(buf, NULL, 10);
 378         mutex_lock(&data->update_lock);
 379         data->temp[nr][index] = TEMP_TO_REG(val);
 380         w83l786ng_write_value(client, W83L786NG_REG_TEMP[nr][index],
 381                               data->temp[nr][index]);
 382         mutex_unlock(&data->update_lock);
 383
 384         return count;
 385 }
 386
 387 static struct sensor_device_attribute_2 sda_temp_input[] = {
 388         SENSOR_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0),
 389         SENSOR_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, 0),
 390 };
 391
 392 static struct sensor_device_attribute_2 sda_temp_max[] = {
 393         SENSOR_ATTR_2(temp1_max, S_IRUGO | S_IWUSR,
 394                       show_temp, store_temp, 0, 1),
 395         SENSOR_ATTR_2(temp2_max, S_IRUGO | S_IWUSR,
 396                       show_temp, store_temp, 1, 1),
 397 };
 398
 399 static struct sensor_device_attribute_2 sda_temp_max_hyst[] = {
 400         SENSOR_ATTR_2(temp1_max_hyst, S_IRUGO | S_IWUSR,
 401                       show_temp, store_temp, 0, 2),
 402         SENSOR_ATTR_2(temp2_max_hyst, S_IRUGO | S_IWUSR,
 403                       show_temp, store_temp, 1, 2),
 404 };
 405
 406 #define show_pwm_reg(reg) \
 407 static ssize_t show_##reg (struct device *dev, struct device_attribute *attr, \
 408                            char *buf) \
 409 { \
 410         struct w83l786ng_data *data = w83l786ng_update_device(dev); \
 411         int nr = to_sensor_dev_attr(attr)->index; \
 412         return sprintf(buf, "%d\n", data->reg[nr]); \
 413 }
 414
 415 show_pwm_reg(pwm_mode)
 416 show_pwm_reg(pwm_enable)
 417 show_pwm_reg(pwm)
 418
 419 static ssize_t
 420 store_pwm_mode(struct device *dev, struct device_attribute *attr,
 421                const char *buf, size_t count)
 422 {
 423         int nr = to_sensor_dev_attr(attr)->index;
 424         struct i2c_client *client = to_i2c_client(dev);
 425         struct w83l786ng_data *data = i2c_get_clientdata(client);
 426         u32 val = simple_strtoul(buf, NULL, 10);
 427         u8 reg;
 428
 429         if (val > 1)
 430                 return -EINVAL;
 431         mutex_lock(&data->update_lock);
 432         data->pwm_mode[nr] = val;
 433         reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
 434         reg &= ~(1 << W83L786NG_PWM_MODE_SHIFT[nr]);
 435         if (!val)
 436                 reg |= 1 << W83L786NG_PWM_MODE_SHIFT[nr];
 437         w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
 438         mutex_unlock(&data->update_lock);
 439         return count;
 440 }
 441
 442 static ssize_t
 443 store_pwm(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         u32 val = SENSORS_LIMIT(simple_strtoul(buf, NULL, 10), 0, 255);
 450
 451         mutex_lock(&data->update_lock);
 452         data->pwm[nr] = val;
 453         w83l786ng_write_value(client, W83L786NG_REG_PWM[nr], val);
 454         mutex_unlock(&data->update_lock);
 455         return count;
 456 }
 457
 458 static ssize_t
 459 store_pwm_enable(struct device *dev, struct device_attribute *attr,
 460                  const char *buf, size_t count)
 461 {
 462         int nr = to_sensor_dev_attr(attr)->index;
 463         struct i2c_client *client = to_i2c_client(dev);
 464         struct w83l786ng_data *data = i2c_get_clientdata(client);
 465         u32 val = simple_strtoul(buf, NULL, 10);
 466
 467         u8 reg;
 468
 469         if (!val || (val > 2))  /* only modes 1 and 2 are supported */
 470                 return -EINVAL;
 471
 472         mutex_lock(&data->update_lock);
 473         reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
 474         data->pwm_enable[nr] = val;
 475         reg &= ~(0x02 << W83L786NG_PWM_ENABLE_SHIFT[nr]);
 476         reg |= (val - 1) << W83L786NG_PWM_ENABLE_SHIFT[nr];
 477         w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
 478         mutex_unlock(&data->update_lock);
 479         return count;
 480 }
 481
 482 static struct sensor_device_attribute sda_pwm[] = {
 483         SENSOR_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0),
 484         SENSOR_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 1),
 485 };
 486
 487 static struct sensor_device_attribute sda_pwm_mode[] = {
 488         SENSOR_ATTR(pwm1_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
 489                     store_pwm_mode, 0),
 490         SENSOR_ATTR(pwm2_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
 491                     store_pwm_mode, 1),
 492 };
 493
 494 static struct sensor_device_attribute sda_pwm_enable[] = {
 495         SENSOR_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
 496                     store_pwm_enable, 0),
 497         SENSOR_ATTR(pwm2_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
 498                     store_pwm_enable, 1),
 499 };
 500
 501 /* For Smart Fan I/Thermal Cruise and Smart Fan II */
 502 static ssize_t
 503 show_tolerance(struct device *dev, struct device_attribute *attr, char *buf)
 504 {
 505         int nr = to_sensor_dev_attr(attr)->index;
 506         struct w83l786ng_data *data = w83l786ng_update_device(dev);
 507         return sprintf(buf, "%ld\n", (long)data->tolerance[nr]);
 508 }
 509
 510 static ssize_t
 511 store_tolerance(struct device *dev, struct device_attribute *attr,
 512                 const char *buf, size_t count)
 513 {
 514         int nr = to_sensor_dev_attr(attr)->index;
 515         struct i2c_client *client = to_i2c_client(dev);
 516         struct w83l786ng_data *data = i2c_get_clientdata(client);
 517         u32 val;
 518         u8 tol_tmp, tol_mask;
 519
 520         val = simple_strtoul(buf, NULL, 10);
 521
 522         mutex_lock(&data->update_lock);
 523         tol_mask = w83l786ng_read_value(client,
 524             W83L786NG_REG_TOLERANCE) & ((nr == 1) ? 0x0f : 0xf0);
 525         tol_tmp = SENSORS_LIMIT(val, 0, 15);
 526         tol_tmp &= 0x0f;
 527         data->tolerance[nr] = tol_tmp;
 528         if (nr == 1) {
 529                 tol_tmp <<= 4;
 530         }
 531
 532         w83l786ng_write_value(client, W83L786NG_REG_TOLERANCE,
 533                               tol_mask | tol_tmp);
 534         mutex_unlock(&data->update_lock);
 535         return count;
 536 }
 537
 538 static struct sensor_device_attribute sda_tolerance[] = {
 539         SENSOR_ATTR(pwm1_tolerance, S_IWUSR | S_IRUGO,
 540                     show_tolerance, store_tolerance, 0),
 541         SENSOR_ATTR(pwm2_tolerance, S_IWUSR | S_IRUGO,
 542                     show_tolerance, store_tolerance, 1),
 543 };
 544
 545
 546 #define IN_UNIT_ATTRS(X)        \
 547         &sda_in_input[X].dev_attr.attr,         \
 548         &sda_in_min[X].dev_attr.attr,           \
 549         &sda_in_max[X].dev_attr.attr
 550
 551 #define FAN_UNIT_ATTRS(X)       \
 552         &sda_fan_input[X].dev_attr.attr,        \
 553         &sda_fan_min[X].dev_attr.attr,          \
 554         &sda_fan_div[X].dev_attr.attr
 555
 556 #define TEMP_UNIT_ATTRS(X)      \
 557         &sda_temp_input[X].dev_attr.attr,       \
 558         &sda_temp_max[X].dev_attr.attr,         \
 559         &sda_temp_max_hyst[X].dev_attr.attr
 560
 561 #define PWM_UNIT_ATTRS(X)       \
 562         &sda_pwm[X].dev_attr.attr,              \
 563         &sda_pwm_mode[X].dev_attr.attr,         \
 564         &sda_pwm_enable[X].dev_attr.attr
 565
 566 #define TOLERANCE_UNIT_ATTRS(X) \
 567         &sda_tolerance[X].dev_attr.attr
 568
 569 static struct attribute *w83l786ng_attributes[] = {
 570         IN_UNIT_ATTRS(0),
 571         IN_UNIT_ATTRS(1),
 572         IN_UNIT_ATTRS(2),
 573         FAN_UNIT_ATTRS(0),
 574         FAN_UNIT_ATTRS(1),
 575         TEMP_UNIT_ATTRS(0),
 576         TEMP_UNIT_ATTRS(1),
 577         PWM_UNIT_ATTRS(0),
 578         PWM_UNIT_ATTRS(1),
 579         TOLERANCE_UNIT_ATTRS(0),
 580         TOLERANCE_UNIT_ATTRS(1),
 581         NULL
 582 };
 583
 584 static const struct attribute_group w83l786ng_group = {
 585         .attrs = w83l786ng_attributes,
 586 };
 587
 588 static int
 589 w83l786ng_detect(struct i2c_client *client, int kind,
 590                  struct i2c_board_info *info)
 591 {
 592         struct i2c_adapter *adapter = client->adapter;
 593
 594         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 595                 return -ENODEV;
 596         }
 597
 598         /*
 599          * Now we do the remaining detection. A negative kind means that
 600          * the driver was loaded with no force parameter (default), so we
 601          * must both detect and identify the chip (actually there is only
 602          * one possible kind of chip for now, W83L786NG). A zero kind means
 603          * that the driver was loaded with the force parameter, the detection
 604          * step shall be skipped. A positive kind means that the driver
 605          * was loaded with the force parameter and a given kind of chip is
 606          * requested, so both the detection and the identification steps
 607          * are skipped.
 608          */
 609         if (kind < 0) { /* detection */
 610                 if (((w83l786ng_read_value(client,
 611                     W83L786NG_REG_CONFIG) & 0x80) != 0x00)) {
 612                         dev_dbg(&adapter->dev,
 613                                 "W83L786NG detection failed at 0x%02x.\n",
 614                                 client->addr);
 615                         return -ENODEV;
 616                 }
 617         }
 618
 619         if (kind <= 0) { /* identification */
 620                 u16 man_id;
 621                 u8 chip_id;
 622
 623                 man_id = (w83l786ng_read_value(client,
 624                     W83L786NG_REG_MAN_ID1) << 8) +
 625                     w83l786ng_read_value(client, W83L786NG_REG_MAN_ID2);
 626                 chip_id = w83l786ng_read_value(client, W83L786NG_REG_CHIP_ID);
 627
 628                 if (man_id == 0x5CA3) { /* Winbond */
 629                         if (chip_id == 0x80) { /* W83L786NG */
 630                                 kind = w83l786ng;
 631                         }
 632                 }
 633
 634                 if (kind <= 0) { /* identification failed */
 635                         dev_info(&adapter->dev,
 636                             "Unsupported chip (man_id=0x%04X, "
 637                             "chip_id=0x%02X).\n", man_id, chip_id);
 638                         return -ENODEV;
 639                 }
 640         }
 641
 642         strlcpy(info->type, "w83l786ng", I2C_NAME_SIZE);
 643
 644         return 0;
 645 }
 646
 647 static int
 648 w83l786ng_probe(struct i2c_client *client, const struct i2c_device_id *id)
 649 {
 650         struct device *dev = &client->dev;
 651         struct w83l786ng_data *data;
 652         int i, err = 0;
 653         u8 reg_tmp;
 654
 655         data = kzalloc(sizeof(struct w83l786ng_data), GFP_KERNEL);
 656         if (!data) {
 657                 err = -ENOMEM;
 658                 goto exit;
 659         }
 660
 661         i2c_set_clientdata(client, data);
 662         mutex_init(&data->update_lock);
 663
 664         /* Initialize the chip */
 665         w83l786ng_init_client(client);
 666
 667         /* A few vars need to be filled upon startup */
 668         for (i = 0; i < 2; i++) {
 669                 data->fan_min[i] = w83l786ng_read_value(client,
 670                     W83L786NG_REG_FAN_MIN(i));
 671         }
 672
 673         /* Update the fan divisor */
 674         reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
 675         data->fan_div[0] = reg_tmp & 0x07;
 676         data->fan_div[1] = (reg_tmp >> 4) & 0x07;
 677
 678         /* Register sysfs hooks */
 679         if ((err = sysfs_create_group(&client->dev.kobj, &w83l786ng_group)))
 680                 goto exit_remove;
 681
 682         data->hwmon_dev = hwmon_device_register(dev);
 683         if (IS_ERR(data->hwmon_dev)) {
 684                 err = PTR_ERR(data->hwmon_dev);
 685                 goto exit_remove;
 686         }
 687
 688         return 0;
 689
 690         /* Unregister sysfs hooks */
 691
 692 exit_remove:
 693         sysfs_remove_group(&client->dev.kobj, &w83l786ng_group);
 694         kfree(data);
 695 exit:
 696         return err;
 697 }
 698
 699 static int
 700 w83l786ng_remove(struct i2c_client *client)
 701 {
 702         struct w83l786ng_data *data = i2c_get_clientdata(client);
 703
 704         hwmon_device_unregister(data->hwmon_dev);
 705         sysfs_remove_group(&client->dev.kobj, &w83l786ng_group);
 706
 707         kfree(data);
 708
 709         return 0;
 710 }
 711
 712 static void
 713 w83l786ng_init_client(struct i2c_client *client)
 714 {
 715         u8 tmp;
 716
 717         if (reset)
 718                 w83l786ng_write_value(client, W83L786NG_REG_CONFIG, 0x80);
 719
 720         /* Start monitoring */
 721         tmp = w83l786ng_read_value(client, W83L786NG_REG_CONFIG);
 722         if (!(tmp & 0x01))
 723                 w83l786ng_write_value(client, W83L786NG_REG_CONFIG, tmp | 0x01);
 724 }
 725
 726 static struct w83l786ng_data *w83l786ng_update_device(struct device *dev)
 727 {
 728         struct i2c_client *client = to_i2c_client(dev);
 729         struct w83l786ng_data *data = i2c_get_clientdata(client);
 730         int i, j;
 731         u8 reg_tmp, pwmcfg;
 732
 733         mutex_lock(&data->update_lock);
 734         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 735             || !data->valid) {
 736                 dev_dbg(&client->dev, "Updating w83l786ng data.\n");
 737
 738                 /* Update the voltages measured value and limits */
 739                 for (i = 0; i < 3; i++) {
 740                         data->in[i] = w83l786ng_read_value(client,
 741                             W83L786NG_REG_IN(i));
 742                         data->in_min[i] = w83l786ng_read_value(client,
 743                             W83L786NG_REG_IN_MIN(i));
 744                         data->in_max[i] = w83l786ng_read_value(client,
 745                             W83L786NG_REG_IN_MAX(i));
 746                 }
 747
 748                 /* Update the fan counts and limits */
 749                 for (i = 0; i < 2; i++) {
 750                         data->fan[i] = w83l786ng_read_value(client,
 751                             W83L786NG_REG_FAN(i));
 752                         data->fan_min[i] = w83l786ng_read_value(client,
 753                             W83L786NG_REG_FAN_MIN(i));
 754                 }
 755
 756                 /* Update the fan divisor */
 757                 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
 758                 data->fan_div[0] = reg_tmp & 0x07;
 759                 data->fan_div[1] = (reg_tmp >> 4) & 0x07;
 760
 761                 pwmcfg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
 762                 for (i = 0; i < 2; i++) {
 763                         data->pwm_mode[i] =
 764                             ((pwmcfg >> W83L786NG_PWM_MODE_SHIFT[i]) & 1)
 765                             ? 0 : 1;
 766                         data->pwm_enable[i] =
 767                             ((pwmcfg >> W83L786NG_PWM_ENABLE_SHIFT[i]) & 2) + 1;
 768                         data->pwm[i] = w83l786ng_read_value(client,
 769                             W83L786NG_REG_PWM[i]);
 770                 }
 771
 772
 773                 /* Update the temperature sensors */
 774                 for (i = 0; i < 2; i++) {
 775                         for (j = 0; j < 3; j++) {
 776                                 data->temp[i][j] = w83l786ng_read_value(client,
 777                                     W83L786NG_REG_TEMP[i][j]);
 778                         }
 779                 }
 780
 781                 /* Update Smart Fan I/II tolerance */
 782                 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_TOLERANCE);
 783                 data->tolerance[0] = reg_tmp & 0x0f;
 784                 data->tolerance[1] = (reg_tmp >> 4) & 0x0f;
 785
 786                 data->last_updated = jiffies;
 787                 data->valid = 1;
 788
 789         }
 790
 791         mutex_unlock(&data->update_lock);
 792
 793         return data;
 794 }
 795
 796 static int __init
 797 sensors_w83l786ng_init(void)
 798 {
 799         return i2c_add_driver(&w83l786ng_driver);
 800 }
 801
 802 static void __exit
 803 sensors_w83l786ng_exit(void)
 804 {
 805         i2c_del_driver(&w83l786ng_driver);
 806 }
 807
 808 MODULE_AUTHOR("Kevin Lo");
 809 MODULE_DESCRIPTION("w83l786ng driver");
 810 MODULE_LICENSE("GPL");
 811
 812 module_init(sensors_w83l786ng_init);
 813 module_exit(sensors_w83l786ng_exit);