drivers/hwmon/w83l786ng.c

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