drivers/hwmon/emc1403.c

   1 /*
   2  * emc1403.c - SMSC Thermal Driver
   3  *
   4  * Copyright (C) 2008 Intel Corp
   5  *
   6  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; version 2 of the License.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  20  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/i2c.h>
  27 #include <linux/hwmon.h>
  28 #include <linux/hwmon-sysfs.h>
  29 #include <linux/err.h>
  30 #include <linux/sysfs.h>
  31 #include <linux/mutex.h>
  32 #include <linux/regmap.h>
  33
  34 #define THERMAL_PID_REG         0xfd
  35 #define THERMAL_SMSC_ID_REG     0xfe
  36 #define THERMAL_REVISION_REG    0xff
  37
  38 enum emc1403_chip { emc1402, emc1403, emc1404 };
  39
  40 struct thermal_data {
  41         struct regmap *regmap;
  42         struct mutex mutex;
  43         const struct attribute_group *groups[4];
  44 };
  45
  46 static ssize_t show_temp(struct device *dev,
  47                         struct device_attribute *attr, char *buf)
  48 {
  49         struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
  50         struct thermal_data *data = dev_get_drvdata(dev);
  51         unsigned int val;
  52         int retval;
  53
  54         retval = regmap_read(data->regmap, sda->index, &val);
  55         if (retval < 0)
  56                 return retval;
  57         return sprintf(buf, "%d000\n", val);
  58 }
  59
  60 static ssize_t show_bit(struct device *dev,
  61                         struct device_attribute *attr, char *buf)
  62 {
  63         struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
  64         struct thermal_data *data = dev_get_drvdata(dev);
  65         unsigned int val;
  66         int retval;
  67
  68         retval = regmap_read(data->regmap, sda->nr, &val);
  69         if (retval < 0)
  70                 return retval;
  71         return sprintf(buf, "%d\n", !!(val & sda->index));
  72 }
  73
  74 static ssize_t store_temp(struct device *dev,
  75                 struct device_attribute *attr, const char *buf, size_t count)
  76 {
  77         struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
  78         struct thermal_data *data = dev_get_drvdata(dev);
  79         unsigned long val;
  80         int retval;
  81
  82         if (kstrtoul(buf, 10, &val))
  83                 return -EINVAL;
  84         retval = regmap_write(data->regmap, sda->index,
  85                               DIV_ROUND_CLOSEST(val, 1000));
  86         if (retval < 0)
  87                 return retval;
  88         return count;
  89 }
  90
  91 static ssize_t store_bit(struct device *dev,
  92                 struct device_attribute *attr, const char *buf, size_t count)
  93 {
  94         struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
  95         struct thermal_data *data = dev_get_drvdata(dev);
  96         unsigned long val;
  97         int retval;
  98
  99         if (kstrtoul(buf, 10, &val))
 100                 return -EINVAL;
 101
 102         retval = regmap_update_bits(data->regmap, sda->nr, sda->index,
 103                                     val ? sda->index : 0);
 104         if (retval < 0)
 105                 return retval;
 106         return count;
 107 }
 108
 109 static ssize_t show_hyst_common(struct device *dev,
 110                                 struct device_attribute *attr, char *buf,
 111                                 bool is_min)
 112 {
 113         struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
 114         struct thermal_data *data = dev_get_drvdata(dev);
 115         struct regmap *regmap = data->regmap;
 116         unsigned int limit;
 117         unsigned int hyst;
 118         int retval;
 119
 120         retval = regmap_read(regmap, sda->index, &limit);
 121         if (retval < 0)
 122                 return retval;
 123
 124         retval = regmap_read(regmap, 0x21, &hyst);
 125         if (retval < 0)
 126                 return retval;
 127
 128         return sprintf(buf, "%d000\n", is_min ? limit + hyst : limit - hyst);
 129 }
 130
 131 static ssize_t show_hyst(struct device *dev,
 132                          struct device_attribute *attr, char *buf)
 133 {
 134         return show_hyst_common(dev, attr, buf, false);
 135 }
 136
 137 static ssize_t show_min_hyst(struct device *dev,
 138                              struct device_attribute *attr, char *buf)
 139 {
 140         return show_hyst_common(dev, attr, buf, true);
 141 }
 142
 143 static ssize_t store_hyst(struct device *dev,
 144                 struct device_attribute *attr, const char *buf, size_t count)
 145 {
 146         struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
 147         struct thermal_data *data = dev_get_drvdata(dev);
 148         struct regmap *regmap = data->regmap;
 149         unsigned int limit;
 150         int retval;
 151         int hyst;
 152         unsigned long val;
 153
 154         if (kstrtoul(buf, 10, &val))
 155                 return -EINVAL;
 156
 157         mutex_lock(&data->mutex);
 158         retval = regmap_read(regmap, sda->index, &limit);
 159         if (retval < 0)
 160                 goto fail;
 161
 162         hyst = limit * 1000 - val;
 163         hyst = clamp_val(DIV_ROUND_CLOSEST(hyst, 1000), 0, 255);
 164         retval = regmap_write(regmap, 0x21, hyst);
 165         if (retval == 0)
 166                 retval = count;
 167 fail:
 168         mutex_unlock(&data->mutex);
 169         return retval;
 170 }
 171
 172 /*
 173  *      Sensors. We pass the actual i2c register to the methods.
 174  */
 175
 176 static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR,
 177         show_temp, store_temp, 0x06);
 178 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
 179         show_temp, store_temp, 0x05);
 180 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR,
 181         show_temp, store_temp, 0x20);
 182 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0x00);
 183 static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO,
 184         show_bit, NULL, 0x36, 0x01);
 185 static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO,
 186         show_bit, NULL, 0x35, 0x01);
 187 static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO,
 188         show_bit, NULL, 0x37, 0x01);
 189 static SENSOR_DEVICE_ATTR(temp1_min_hyst, S_IRUGO, show_min_hyst, NULL, 0x06);
 190 static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IRUGO, show_hyst, NULL, 0x05);
 191 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO | S_IWUSR,
 192         show_hyst, store_hyst, 0x20);
 193
 194 static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR,
 195         show_temp, store_temp, 0x08);
 196 static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR,
 197         show_temp, store_temp, 0x07);
 198 static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR,
 199         show_temp, store_temp, 0x19);
 200 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 0x01);
 201 static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_bit, NULL, 0x1b, 0x02);
 202 static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO,
 203         show_bit, NULL, 0x36, 0x02);
 204 static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO,
 205         show_bit, NULL, 0x35, 0x02);
 206 static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO,
 207         show_bit, NULL, 0x37, 0x02);
 208 static SENSOR_DEVICE_ATTR(temp2_min_hyst, S_IRUGO, show_min_hyst, NULL, 0x08);
 209 static SENSOR_DEVICE_ATTR(temp2_max_hyst, S_IRUGO, show_hyst, NULL, 0x07);
 210 static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_hyst, NULL, 0x19);
 211
 212 static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR,
 213         show_temp, store_temp, 0x16);
 214 static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO | S_IWUSR,
 215         show_temp, store_temp, 0x15);
 216 static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO | S_IWUSR,
 217         show_temp, store_temp, 0x1A);
 218 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 0x23);
 219 static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_bit, NULL, 0x1b, 0x04);
 220 static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO,
 221         show_bit, NULL, 0x36, 0x04);
 222 static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO,
 223         show_bit, NULL, 0x35, 0x04);
 224 static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO,
 225         show_bit, NULL, 0x37, 0x04);
 226 static SENSOR_DEVICE_ATTR(temp3_min_hyst, S_IRUGO, show_min_hyst, NULL, 0x16);
 227 static SENSOR_DEVICE_ATTR(temp3_max_hyst, S_IRUGO, show_hyst, NULL, 0x15);
 228 static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_hyst, NULL, 0x1A);
 229
 230 static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO | S_IWUSR,
 231         show_temp, store_temp, 0x2D);
 232 static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO | S_IWUSR,
 233         show_temp, store_temp, 0x2C);
 234 static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO | S_IWUSR,
 235         show_temp, store_temp, 0x30);
 236 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 0x2A);
 237 static SENSOR_DEVICE_ATTR_2(temp4_fault, S_IRUGO, show_bit, NULL, 0x1b, 0x08);
 238 static SENSOR_DEVICE_ATTR_2(temp4_min_alarm, S_IRUGO,
 239         show_bit, NULL, 0x36, 0x08);
 240 static SENSOR_DEVICE_ATTR_2(temp4_max_alarm, S_IRUGO,
 241         show_bit, NULL, 0x35, 0x08);
 242 static SENSOR_DEVICE_ATTR_2(temp4_crit_alarm, S_IRUGO,
 243         show_bit, NULL, 0x37, 0x08);
 244 static SENSOR_DEVICE_ATTR(temp4_min_hyst, S_IRUGO, show_min_hyst, NULL, 0x2D);
 245 static SENSOR_DEVICE_ATTR(temp4_max_hyst, S_IRUGO, show_hyst, NULL, 0x2C);
 246 static SENSOR_DEVICE_ATTR(temp4_crit_hyst, S_IRUGO, show_hyst, NULL, 0x30);
 247
 248 static SENSOR_DEVICE_ATTR_2(power_state, S_IRUGO | S_IWUSR,
 249         show_bit, store_bit, 0x03, 0x40);
 250
 251 static struct attribute *emc1402_attrs[] = {
 252         &sensor_dev_attr_temp1_min.dev_attr.attr,
 253         &sensor_dev_attr_temp1_max.dev_attr.attr,
 254         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 255         &sensor_dev_attr_temp1_input.dev_attr.attr,
 256         &sensor_dev_attr_temp1_min_hyst.dev_attr.attr,
 257         &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
 258         &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
 259
 260         &sensor_dev_attr_temp2_min.dev_attr.attr,
 261         &sensor_dev_attr_temp2_max.dev_attr.attr,
 262         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 263         &sensor_dev_attr_temp2_input.dev_attr.attr,
 264         &sensor_dev_attr_temp2_min_hyst.dev_attr.attr,
 265         &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
 266         &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
 267
 268         &sensor_dev_attr_power_state.dev_attr.attr,
 269         NULL
 270 };
 271
 272 static const struct attribute_group emc1402_group = {
 273                 .attrs = emc1402_attrs,
 274 };
 275
 276 static struct attribute *emc1403_attrs[] = {
 277         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 278         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 279         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 280
 281         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 282         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 283         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 284         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 285
 286         &sensor_dev_attr_temp3_min.dev_attr.attr,
 287         &sensor_dev_attr_temp3_max.dev_attr.attr,
 288         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 289         &sensor_dev_attr_temp3_input.dev_attr.attr,
 290         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 291         &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
 292         &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 293         &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
 294         &sensor_dev_attr_temp3_min_hyst.dev_attr.attr,
 295         &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
 296         &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
 297         NULL
 298 };
 299
 300 static const struct attribute_group emc1403_group = {
 301         .attrs = emc1403_attrs,
 302 };
 303
 304 static struct attribute *emc1404_attrs[] = {
 305         &sensor_dev_attr_temp4_min.dev_attr.attr,
 306         &sensor_dev_attr_temp4_max.dev_attr.attr,
 307         &sensor_dev_attr_temp4_crit.dev_attr.attr,
 308         &sensor_dev_attr_temp4_input.dev_attr.attr,
 309         &sensor_dev_attr_temp4_fault.dev_attr.attr,
 310         &sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
 311         &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
 312         &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
 313         &sensor_dev_attr_temp4_min_hyst.dev_attr.attr,
 314         &sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
 315         &sensor_dev_attr_temp4_crit_hyst.dev_attr.attr,
 316         NULL
 317 };
 318
 319 static const struct attribute_group emc1404_group = {
 320         .attrs = emc1404_attrs,
 321 };
 322
 323 /*
 324  * EMC14x2 uses a different register and different bits to report alarm and
 325  * fault status. For simplicity, provide a separate attribute group for this
 326  * chip series.
 327  * Since we can not re-use the same attribute names, create a separate attribute
 328  * array.
 329  */
 330 static struct sensor_device_attribute_2 emc1402_alarms[] = {
 331         SENSOR_ATTR_2(temp1_min_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x20),
 332         SENSOR_ATTR_2(temp1_max_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x40),
 333         SENSOR_ATTR_2(temp1_crit_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x01),
 334
 335         SENSOR_ATTR_2(temp2_fault, S_IRUGO, show_bit, NULL, 0x02, 0x04),
 336         SENSOR_ATTR_2(temp2_min_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x08),
 337         SENSOR_ATTR_2(temp2_max_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x10),
 338         SENSOR_ATTR_2(temp2_crit_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x02),
 339 };
 340
 341 static struct attribute *emc1402_alarm_attrs[] = {
 342         &emc1402_alarms[0].dev_attr.attr,
 343         &emc1402_alarms[1].dev_attr.attr,
 344         &emc1402_alarms[2].dev_attr.attr,
 345         &emc1402_alarms[3].dev_attr.attr,
 346         &emc1402_alarms[4].dev_attr.attr,
 347         &emc1402_alarms[5].dev_attr.attr,
 348         &emc1402_alarms[6].dev_attr.attr,
 349         NULL,
 350 };
 351
 352 static const struct attribute_group emc1402_alarm_group = {
 353         .attrs = emc1402_alarm_attrs,
 354 };
 355
 356 static int emc1403_detect(struct i2c_client *client,
 357                         struct i2c_board_info *info)
 358 {
 359         int id;
 360         /* Check if thermal chip is SMSC and EMC1403 or EMC1423 */
 361
 362         id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
 363         if (id != 0x5d)
 364                 return -ENODEV;
 365
 366         id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
 367         switch (id) {
 368         case 0x20:
 369                 strlcpy(info->type, "emc1402", I2C_NAME_SIZE);
 370                 break;
 371         case 0x21:
 372                 strlcpy(info->type, "emc1403", I2C_NAME_SIZE);
 373                 break;
 374         case 0x22:
 375                 strlcpy(info->type, "emc1422", I2C_NAME_SIZE);
 376                 break;
 377         case 0x23:
 378                 strlcpy(info->type, "emc1423", I2C_NAME_SIZE);
 379                 break;
 380         case 0x25:
 381                 strlcpy(info->type, "emc1404", I2C_NAME_SIZE);
 382                 break;
 383         case 0x27:
 384                 strlcpy(info->type, "emc1424", I2C_NAME_SIZE);
 385                 break;
 386         default:
 387                 return -ENODEV;
 388         }
 389
 390         id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
 391         if (id < 0x01 || id > 0x04)
 392                 return -ENODEV;
 393
 394         return 0;
 395 }
 396
 397 static bool emc1403_regmap_is_volatile(struct device *dev, unsigned int reg)
 398 {
 399         switch (reg) {
 400         case 0x00:      /* internal diode high byte */
 401         case 0x01:      /* external diode 1 high byte */
 402         case 0x02:      /* status */
 403         case 0x10:      /* external diode 1 low byte */
 404         case 0x1b:      /* external diode fault */
 405         case 0x23:      /* external diode 2 high byte */
 406         case 0x24:      /* external diode 2 low byte */
 407         case 0x29:      /* internal diode low byte */
 408         case 0x2a:      /* externl diode 3 high byte */
 409         case 0x2b:      /* external diode 3 low byte */
 410         case 0x35:      /* high limit status */
 411         case 0x36:      /* low limit status */
 412         case 0x37:      /* therm limit status */
 413                 return true;
 414         default:
 415                 return false;
 416         }
 417 }
 418
 419 static const struct regmap_config emc1403_regmap_config = {
 420         .reg_bits = 8,
 421         .val_bits = 8,
 422         .cache_type = REGCACHE_RBTREE,
 423         .volatile_reg = emc1403_regmap_is_volatile,
 424 };
 425
 426 static int emc1403_probe(struct i2c_client *client,
 427                         const struct i2c_device_id *id)
 428 {
 429         struct thermal_data *data;
 430         struct device *hwmon_dev;
 431
 432         data = devm_kzalloc(&client->dev, sizeof(struct thermal_data),
 433                             GFP_KERNEL);
 434         if (data == NULL)
 435                 return -ENOMEM;
 436
 437         data->regmap = devm_regmap_init_i2c(client, &emc1403_regmap_config);
 438         if (IS_ERR(data->regmap))
 439                 return PTR_ERR(data->regmap);
 440
 441         mutex_init(&data->mutex);
 442
 443         switch (id->driver_data) {
 444         case emc1404:
 445                 data->groups[2] = &emc1404_group;
 446                 /* fall through */
 447         case emc1403:
 448                 data->groups[1] = &emc1403_group;
 449                 /* fall through */
 450         case emc1402:
 451                 data->groups[0] = &emc1402_group;
 452         }
 453
 454         if (id->driver_data == emc1402)
 455                 data->groups[1] = &emc1402_alarm_group;
 456
 457         hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
 458                                                            client->name, data,
 459                                                            data->groups);
 460         if (IS_ERR(hwmon_dev))
 461                 return PTR_ERR(hwmon_dev);
 462
 463         dev_info(&client->dev, "%s Thermal chip found\n", id->name);
 464         return 0;
 465 }
 466
 467 static const unsigned short emc1403_address_list[] = {
 468         0x18, 0x1c, 0x29, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END
 469 };
 470
 471 /* Last digit of chip name indicates number of channels */
 472 static const struct i2c_device_id emc1403_idtable[] = {
 473         { "emc1402", emc1402 },
 474         { "emc1403", emc1403 },
 475         { "emc1404", emc1404 },
 476         { "emc1412", emc1402 },
 477         { "emc1413", emc1403 },
 478         { "emc1414", emc1404 },
 479         { "emc1422", emc1402 },
 480         { "emc1423", emc1403 },
 481         { "emc1424", emc1404 },
 482         { }
 483 };
 484 MODULE_DEVICE_TABLE(i2c, emc1403_idtable);
 485
 486 static struct i2c_driver sensor_emc1403 = {
 487         .class = I2C_CLASS_HWMON,
 488         .driver = {
 489                 .name = "emc1403",
 490         },
 491         .detect = emc1403_detect,
 492         .probe = emc1403_probe,
 493         .id_table = emc1403_idtable,
 494         .address_list = emc1403_address_list,
 495 };
 496
 497 module_i2c_driver(sensor_emc1403);
 498
 499 MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
 500 MODULE_DESCRIPTION("emc1403 Thermal Driver");
 501 MODULE_LICENSE("GPL v2");