drivers/macintosh/therm_adt746x.c

   1 /*
   2  * Device driver for the i2c thermostat found on the iBook G4, Albook G4
   3  *
   4  * Copyright (C) 2003, 2004 Colin Leroy, Rasmus Rohde, Benjamin Herrenschmidt
   5  *
   6  * Documentation from
   7  * http://www.analog.com/UploadedFiles/Data_Sheets/115254175ADT7467_pra.pdf
   8  * http://www.analog.com/UploadedFiles/Data_Sheets/3686221171167ADT7460_b.pdf
   9  *
  10  */
  11
  12 #include <linux/config.h>
  13 #include <linux/types.h>
  14 #include <linux/module.h>
  15 #include <linux/errno.h>
  16 #include <linux/kernel.h>
  17 #include <linux/delay.h>
  18 #include <linux/sched.h>
  19 #include <linux/i2c.h>
  20 #include <linux/slab.h>
  21 #include <linux/init.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/smp_lock.h>
  24 #include <linux/wait.h>
  25 #include <linux/suspend.h>
  26 #include <linux/kthread.h>
  27 #include <linux/moduleparam.h>
  28
  29 #include <asm/prom.h>
  30 #include <asm/machdep.h>
  31 #include <asm/io.h>
  32 #include <asm/system.h>
  33 #include <asm/sections.h>
  34 #include <asm/of_device.h>
  35
  36 #undef DEBUG
  37
  38 #define CONFIG_REG   0x40
  39 #define MANUAL_MASK  0xe0
  40 #define AUTO_MASK    0x20
  41
  42 static u8 TEMP_REG[3]    = {0x26, 0x25, 0x27}; /* local, sensor1, sensor2 */
  43 static u8 LIMIT_REG[3]   = {0x6b, 0x6a, 0x6c}; /* local, sensor1, sensor2 */
  44 static u8 MANUAL_MODE[2] = {0x5c, 0x5d};
  45 static u8 REM_CONTROL[2] = {0x00, 0x40};
  46 static u8 FAN_SPEED[2]   = {0x28, 0x2a};
  47 static u8 FAN_SPD_SET[2] = {0x30, 0x31};
  48
  49 static u8 default_limits_local[3] = {70, 50, 70};    /* local, sensor1, sensor2 */
  50 static u8 default_limits_chip[3] = {80, 65, 80};    /* local, sensor1, sensor2 */
  51 static char *sensor_location[3] = {NULL, NULL, NULL};
  52
  53 static int limit_adjust = 0;
  54 static int fan_speed = -1;
  55
  56 MODULE_AUTHOR("Colin Leroy <colin@colino.net>");
  57 MODULE_DESCRIPTION("Driver for ADT746x thermostat in iBook G4 and "
  58                    "Powerbook G4 Alu");
  59 MODULE_LICENSE("GPL");
  60
  61 module_param(limit_adjust, int, 0644);
  62 MODULE_PARM_DESC(limit_adjust,"Adjust maximum temperatures (50 sensor1, 70 sensor2) "
  63                  "by N degrees.");
  64
  65 module_param(fan_speed, int, 0644);
  66 MODULE_PARM_DESC(fan_speed,"Specify starting fan speed (0-255) "
  67                  "(default 64)");
  68
  69 struct thermostat {
  70         struct i2c_client       clt;
  71         u8                      temps[3];
  72         u8                      cached_temp[3];
  73         u8                      initial_limits[3];
  74         u8                      limits[3];
  75         int                     last_speed[2];
  76         int                     last_var[2];
  77 };
  78
  79 static enum {ADT7460, ADT7467} therm_type;
  80 static int therm_bus, therm_address;
  81 static struct of_device * of_dev;
  82 static struct thermostat* thermostat;
  83 static struct task_struct *thread_therm = NULL;
  84
  85 static int attach_one_thermostat(struct i2c_adapter *adapter, int addr,
  86                                  int busno);
  87
  88 static void write_both_fan_speed(struct thermostat *th, int speed);
  89 static void write_fan_speed(struct thermostat *th, int speed, int fan);
  90
  91 static int
  92 write_reg(struct thermostat* th, int reg, u8 data)
  93 {
  94         u8 tmp[2];
  95         int rc;
  96
  97         tmp[0] = reg;
  98         tmp[1] = data;
  99         rc = i2c_master_send(&th->clt, (const char *)tmp, 2);
 100         if (rc < 0)
 101                 return rc;
 102         if (rc != 2)
 103                 return -ENODEV;
 104         return 0;
 105 }
 106
 107 static int
 108 read_reg(struct thermostat* th, int reg)
 109 {
 110         u8 reg_addr, data;
 111         int rc;
 112
 113         reg_addr = (u8)reg;
 114         rc = i2c_master_send(&th->clt, &reg_addr, 1);
 115         if (rc < 0)
 116                 return rc;
 117         if (rc != 1)
 118                 return -ENODEV;
 119         rc = i2c_master_recv(&th->clt, (char *)&data, 1);
 120         if (rc < 0)
 121                 return rc;
 122         return data;
 123 }
 124
 125 static int
 126 attach_thermostat(struct i2c_adapter *adapter)
 127 {
 128         unsigned long bus_no;
 129
 130         if (strncmp(adapter->name, "uni-n", 5))
 131                 return -ENODEV;
 132         bus_no = simple_strtoul(adapter->name + 6, NULL, 10);
 133         if (bus_no != therm_bus)
 134                 return -ENODEV;
 135         return attach_one_thermostat(adapter, therm_address, bus_no);
 136 }
 137
 138 static int
 139 detach_thermostat(struct i2c_adapter *adapter)
 140 {
 141         struct thermostat* th;
 142         int i;
 143
 144         if (thermostat == NULL)
 145                 return 0;
 146
 147         th = thermostat;
 148
 149         if (thread_therm != NULL) {
 150                 kthread_stop(thread_therm);
 151         }
 152
 153         printk(KERN_INFO "adt746x: Putting max temperatures back from "
 154                          "%d, %d, %d to %d, %d, %d\n",
 155                 th->limits[0], th->limits[1], th->limits[2],
 156                 th->initial_limits[0], th->initial_limits[1],
 157                 th->initial_limits[2]);
 158
 159         for (i = 0; i < 3; i++)
 160                 write_reg(th, LIMIT_REG[i], th->initial_limits[i]);
 161
 162         write_both_fan_speed(th, -1);
 163
 164         i2c_detach_client(&th->clt);
 165
 166         thermostat = NULL;
 167
 168         kfree(th);
 169
 170         return 0;
 171 }
 172
 173 static struct i2c_driver thermostat_driver = {
 174         .owner          = THIS_MODULE,
 175         .name           = "therm_adt746x",
 176         .flags          = I2C_DF_NOTIFY,
 177         .attach_adapter = attach_thermostat,
 178         .detach_adapter = detach_thermostat,
 179 };
 180
 181 static int read_fan_speed(struct thermostat *th, u8 addr)
 182 {
 183         u8 tmp[2];
 184         u16 res;
 185
 186         /* should start with low byte */
 187         tmp[1] = read_reg(th, addr);
 188         tmp[0] = read_reg(th, addr + 1);
 189
 190         res = tmp[1] + (tmp[0] << 8);
 191         /* "a value of 0xffff means that the fan has stopped" */
 192         return (res == 0xffff ? 0 : (90000*60)/res);
 193 }
 194
 195 static void write_both_fan_speed(struct thermostat *th, int speed)
 196 {
 197         write_fan_speed(th, speed, 0);
 198         if (therm_type == ADT7460)
 199                 write_fan_speed(th, speed, 1);
 200 }
 201
 202 static void write_fan_speed(struct thermostat *th, int speed, int fan)
 203 {
 204         u8 manual;
 205
 206         if (speed > 0xff)
 207                 speed = 0xff;
 208         else if (speed < -1)
 209                 speed = 0;
 210
 211         if (therm_type == ADT7467 && fan == 1)
 212                 return;
 213
 214         if (th->last_speed[fan] != speed) {
 215                 if (speed == -1)
 216                         printk(KERN_DEBUG "adt746x: Setting speed to automatic "
 217                                 "for %s fan.\n", sensor_location[fan+1]);
 218                 else
 219                         printk(KERN_DEBUG "adt746x: Setting speed to %d "
 220                                 "for %s fan.\n", speed, sensor_location[fan+1]);
 221         } else
 222                 return;
 223
 224         if (speed >= 0) {
 225                 manual = read_reg(th, MANUAL_MODE[fan]);
 226                 write_reg(th, MANUAL_MODE[fan], manual|MANUAL_MASK);
 227                 write_reg(th, FAN_SPD_SET[fan], speed);
 228         } else {
 229                 /* back to automatic */
 230                 if(therm_type == ADT7460) {
 231                         manual = read_reg(th,
 232                                 MANUAL_MODE[fan]) & (~MANUAL_MASK);
 233
 234                         write_reg(th,
 235                                 MANUAL_MODE[fan], manual|REM_CONTROL[fan]);
 236                 } else {
 237                         manual = read_reg(th, MANUAL_MODE[fan]);
 238                         write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK));
 239                 }
 240         }
 241
 242         th->last_speed[fan] = speed;
 243 }
 244
 245 static void read_sensors(struct thermostat *th)
 246 {
 247         int i = 0;
 248
 249         for (i = 0; i < 3; i++)
 250                 th->temps[i]  = read_reg(th, TEMP_REG[i]);
 251 }
 252
 253 #ifdef DEBUG
 254 static void display_stats(struct thermostat *th)
 255 {
 256         if (th->temps[0] != th->cached_temp[0]
 257         ||  th->temps[1] != th->cached_temp[1]
 258         ||  th->temps[2] != th->cached_temp[2]) {
 259                 printk(KERN_INFO "adt746x: Temperature infos:"
 260                                  " thermostats: %d,%d,%d;"
 261                                  " limits: %d,%d,%d;"
 262                                  " fan speed: %d RPM\n",
 263                                  th->temps[0], th->temps[1], th->temps[2],
 264                                  th->limits[0],  th->limits[1],  th->limits[2],
 265                                  read_fan_speed(th, FAN_SPEED[0]));
 266         }
 267         th->cached_temp[0] = th->temps[0];
 268         th->cached_temp[1] = th->temps[1];
 269         th->cached_temp[2] = th->temps[2];
 270 }
 271 #endif
 272
 273 static void update_fans_speed (struct thermostat *th)
 274 {
 275         int lastvar = 0; /* last variation, for iBook */
 276         int i = 0;
 277
 278         /* we don't care about local sensor, so we start at sensor 1 */
 279         for (i = 1; i < 3; i++) {
 280                 int started = 0;
 281                 int fan_number = (therm_type == ADT7460 && i == 2);
 282                 int var = th->temps[i] - th->limits[i];
 283
 284                 if (var > -1) {
 285                         int step = (255 - fan_speed) / 7;
 286                         int new_speed = 0;
 287
 288                         /* hysteresis : change fan speed only if variation is
 289                          * more than two degrees */
 290                         if (abs(var - th->last_var[fan_number]) < 2)
 291                                 continue;
 292
 293                         started = 1;
 294                         new_speed = fan_speed + ((var-1)*step);
 295
 296                         if (new_speed < fan_speed)
 297                                 new_speed = fan_speed;
 298                         if (new_speed > 255)
 299                                 new_speed = 255;
 300
 301                         printk(KERN_DEBUG "adt746x: setting fans speed to %d "
 302                                          "(limit exceeded by %d on %s) \n",
 303                                         new_speed, var,
 304                                         sensor_location[fan_number+1]);
 305                         write_both_fan_speed(th, new_speed);
 306                         th->last_var[fan_number] = var;
 307                 } else if (var < -2) {
 308                         /* don't stop fan if sensor2 is cold and sensor1 is not
 309                          * so cold (lastvar >= -1) */
 310                         if (i == 2 && lastvar < -1) {
 311                                 if (th->last_speed[fan_number] != 0)
 312                                         printk(KERN_DEBUG "adt746x: Stopping "
 313                                                 "fans.\n");
 314                                 write_both_fan_speed(th, 0);
 315                         }
 316                 }
 317
 318                 lastvar = var;
 319
 320                 if (started)
 321                         return; /* we don't want to re-stop the fan
 322                                 * if sensor1 is heating and sensor2 is not */
 323         }
 324 }
 325
 326 static int monitor_task(void *arg)
 327 {
 328         struct thermostat* th = arg;
 329
 330         while(!kthread_should_stop()) {
 331                 if (current->flags & PF_FREEZE)
 332                         refrigerator(PF_FREEZE);
 333
 334                 msleep_interruptible(2000);
 335
 336 #ifndef DEBUG
 337                 if (fan_speed != -1)
 338                         read_sensors(th);
 339 #else
 340                 read_sensors(th);
 341 #endif
 342
 343                 if (fan_speed != -1)
 344                         update_fans_speed(th);
 345
 346 #ifdef DEBUG
 347                 display_stats(th);
 348 #endif
 349
 350         }
 351
 352         return 0;
 353 }
 354
 355 static void set_limit(struct thermostat *th, int i)
 356 {
 357                 /* Set sensor1 limit higher to avoid powerdowns */
 358                 th->limits[i] = default_limits_chip[i] + limit_adjust;
 359                 write_reg(th, LIMIT_REG[i], th->limits[i]);
 360
 361                 /* set our limits to normal */
 362                 th->limits[i] = default_limits_local[i] + limit_adjust;
 363 }
 364
 365 static int attach_one_thermostat(struct i2c_adapter *adapter, int addr,
 366                                  int busno)
 367 {
 368         struct thermostat* th;
 369         int rc;
 370         int i;
 371
 372         if (thermostat)
 373                 return 0;
 374
 375         th = (struct thermostat *)
 376                 kmalloc(sizeof(struct thermostat), GFP_KERNEL);
 377
 378         if (!th)
 379                 return -ENOMEM;
 380
 381         memset(th, 0, sizeof(*th));
 382         th->clt.addr = addr;
 383         th->clt.adapter = adapter;
 384         th->clt.driver = &thermostat_driver;
 385         strcpy(th->clt.name, "thermostat");
 386
 387         rc = read_reg(th, 0);
 388         if (rc < 0) {
 389                 printk(KERN_ERR "adt746x: Thermostat failed to read config "
 390                                 "from bus %d !\n",
 391                                 busno);
 392                 kfree(th);
 393                 return -ENODEV;
 394         }
 395
 396         /* force manual control to start the fan quieter */
 397         if (fan_speed == -1)
 398                 fan_speed = 64;
 399
 400         if(therm_type == ADT7460) {
 401                 printk(KERN_INFO "adt746x: ADT7460 initializing\n");
 402                 /* The 7460 needs to be started explicitly */
 403                 write_reg(th, CONFIG_REG, 1);
 404         } else
 405                 printk(KERN_INFO "adt746x: ADT7467 initializing\n");
 406
 407         for (i = 0; i < 3; i++) {
 408                 th->initial_limits[i] = read_reg(th, LIMIT_REG[i]);
 409                 set_limit(th, i);
 410         }
 411
 412         printk(KERN_INFO "adt746x: Lowering max temperatures from %d, %d, %d"
 413                          " to %d, %d, %d\n",
 414                          th->initial_limits[0], th->initial_limits[1],
 415                          th->initial_limits[2], th->limits[0], th->limits[1],
 416                          th->limits[2]);
 417
 418         thermostat = th;
 419
 420         if (i2c_attach_client(&th->clt)) {
 421                 printk(KERN_INFO "adt746x: Thermostat failed to attach "
 422                                  "client !\n");
 423                 thermostat = NULL;
 424                 kfree(th);
 425                 return -ENODEV;
 426         }
 427
 428         /* be sure to really write fan speed the first time */
 429         th->last_speed[0] = -2;
 430         th->last_speed[1] = -2;
 431         th->last_var[0] = -80;
 432         th->last_var[1] = -80;
 433
 434         if (fan_speed != -1) {
 435                 /* manual mode, stop fans */
 436                 write_both_fan_speed(th, 0);
 437         } else {
 438                 /* automatic mode */
 439                 write_both_fan_speed(th, -1);
 440         }
 441
 442         thread_therm = kthread_run(monitor_task, th, "kfand");
 443
 444         if (thread_therm == ERR_PTR(-ENOMEM)) {
 445                 printk(KERN_INFO "adt746x: Kthread creation failed\n");
 446                 thread_therm = NULL;
 447                 return -ENOMEM;
 448         }
 449
 450         return 0;
 451 }
 452
 453 /*
 454  * Now, unfortunately, sysfs doesn't give us a nice void * we could
 455  * pass around to the attribute functions, so we don't really have
 456  * choice but implement a bunch of them...
 457  *
 458  */
 459 #define BUILD_SHOW_FUNC_INT(name, data)                         \
 460 static ssize_t show_##name(struct device *dev, char *buf)       \
 461 {                                                               \
 462         return sprintf(buf, "%d\n", data);                      \
 463 }
 464
 465 #define BUILD_SHOW_FUNC_STR(name, data)                         \
 466 static ssize_t show_##name(struct device *dev, char *buf)       \
 467 {                                                               \
 468         return sprintf(buf, "%s\n", data);                      \
 469 }
 470
 471 #define BUILD_SHOW_FUNC_FAN(name, data)                         \
 472 static ssize_t show_##name(struct device *dev, char *buf)       \
 473 {                                                               \
 474         return sprintf(buf, "%d (%d rpm)\n",                    \
 475                 thermostat->last_speed[data],                   \
 476                 read_fan_speed(thermostat, FAN_SPEED[data])     \
 477                 );                                              \
 478 }
 479
 480 #define BUILD_STORE_FUNC_DEG(name, data)                        \
 481 static ssize_t store_##name(struct device *dev, const char *buf, size_t n) \
 482 {                                                               \
 483         int val;                                                \
 484         int i;                                                  \
 485         val = simple_strtol(buf, NULL, 10);                     \
 486         printk(KERN_INFO "Adjusting limits by %d degrees\n", val);      \
 487         limit_adjust = val;                                     \
 488         for (i=0; i < 3; i++)                                   \
 489                 set_limit(thermostat, i);                       \
 490         return n;                                               \
 491 }
 492
 493 #define BUILD_STORE_FUNC_INT(name, data)                        \
 494 static ssize_t store_##name(struct device *dev, const char *buf, size_t n) \
 495 {                                                               \
 496         u32 val;                                                \
 497         val = simple_strtoul(buf, NULL, 10);                    \
 498         if (val < 0 || val > 255)                               \
 499                 return -EINVAL;                                 \
 500         printk(KERN_INFO "Setting specified fan speed to %d\n", val);   \
 501         data = val;                                             \
 502         return n;                                               \
 503 }
 504
 505 BUILD_SHOW_FUNC_INT(sensor1_temperature,         (read_reg(thermostat, TEMP_REG[1])))
 506 BUILD_SHOW_FUNC_INT(sensor2_temperature,         (read_reg(thermostat, TEMP_REG[2])))
 507 BUILD_SHOW_FUNC_INT(sensor1_limit,               thermostat->limits[1])
 508 BUILD_SHOW_FUNC_INT(sensor2_limit,               thermostat->limits[2])
 509 BUILD_SHOW_FUNC_STR(sensor1_location,            sensor_location[1])
 510 BUILD_SHOW_FUNC_STR(sensor2_location,            sensor_location[2])
 511
 512 BUILD_SHOW_FUNC_INT(specified_fan_speed, fan_speed)
 513 BUILD_SHOW_FUNC_FAN(sensor1_fan_speed,   0)
 514 BUILD_SHOW_FUNC_FAN(sensor2_fan_speed,   1)
 515
 516 BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed)
 517 BUILD_SHOW_FUNC_INT(limit_adjust,        limit_adjust)
 518 BUILD_STORE_FUNC_DEG(limit_adjust,       thermostat)
 519
 520 static DEVICE_ATTR(sensor1_temperature, S_IRUGO,
 521                    show_sensor1_temperature,NULL);
 522 static DEVICE_ATTR(sensor2_temperature, S_IRUGO,
 523                    show_sensor2_temperature,NULL);
 524 static DEVICE_ATTR(sensor1_limit, S_IRUGO,
 525                    show_sensor1_limit,  NULL);
 526 static DEVICE_ATTR(sensor2_limit, S_IRUGO,
 527                    show_sensor2_limit,  NULL);
 528 static DEVICE_ATTR(sensor1_location, S_IRUGO,
 529                    show_sensor1_location, NULL);
 530 static DEVICE_ATTR(sensor2_location, S_IRUGO,
 531                    show_sensor2_location, NULL);
 532
 533 static DEVICE_ATTR(specified_fan_speed, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 534                    show_specified_fan_speed,store_specified_fan_speed);
 535
 536 static DEVICE_ATTR(sensor1_fan_speed,   S_IRUGO,
 537                    show_sensor1_fan_speed,      NULL);
 538 static DEVICE_ATTR(sensor2_fan_speed,   S_IRUGO,
 539                    show_sensor2_fan_speed,      NULL);
 540
 541 static DEVICE_ATTR(limit_adjust,        S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 542                    show_limit_adjust,   store_limit_adjust);
 543
 544
 545 static int __init
 546 thermostat_init(void)
 547 {
 548         struct device_node* np;
 549         u32 *prop;
 550         int i = 0, offset = 0;
 551
 552         np = of_find_node_by_name(NULL, "fan");
 553         if (!np)
 554                 return -ENODEV;
 555         if (device_is_compatible(np, "adt7460"))
 556                 therm_type = ADT7460;
 557         else if (device_is_compatible(np, "adt7467"))
 558                 therm_type = ADT7467;
 559         else
 560                 return -ENODEV;
 561
 562         prop = (u32 *)get_property(np, "hwsensor-params-version", NULL);
 563         printk(KERN_INFO "adt746x: version %d (%ssupported)\n", *prop,
 564                          (*prop == 1)?"":"un");
 565         if (*prop != 1)
 566                 return -ENODEV;
 567
 568         prop = (u32 *)get_property(np, "reg", NULL);
 569         if (!prop)
 570                 return -ENODEV;
 571
 572         /* look for bus either by path or using "reg" */
 573         if (strstr(np->full_name, "/i2c-bus@") != NULL) {
 574                 const char *tmp_bus = (strstr(np->full_name, "/i2c-bus@") + 9);
 575                 therm_bus = tmp_bus[0]-'0';
 576         } else {
 577                 therm_bus = ((*prop) >> 8) & 0x0f;
 578         }
 579
 580         therm_address = ((*prop) & 0xff) >> 1;
 581
 582         printk(KERN_INFO "adt746x: Thermostat bus: %d, address: 0x%02x, "
 583                          "limit_adjust: %d, fan_speed: %d\n",
 584                          therm_bus, therm_address, limit_adjust, fan_speed);
 585
 586         if (get_property(np, "hwsensor-location", NULL)) {
 587                 for (i = 0; i < 3; i++) {
 588                         sensor_location[i] = get_property(np,
 589                                         "hwsensor-location", NULL) + offset;
 590
 591                         if (sensor_location[i] == NULL)
 592                                 sensor_location[i] = "";
 593
 594                         printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]);
 595                         offset += strlen(sensor_location[i]) + 1;
 596                 }
 597         } else {
 598                 sensor_location[0] = "?";
 599                 sensor_location[1] = "?";
 600                 sensor_location[2] = "?";
 601         }
 602
 603         of_dev = of_platform_device_create(np, "temperatures");
 604
 605         if (of_dev == NULL) {
 606                 printk(KERN_ERR "Can't register temperatures device !\n");
 607                 return -ENODEV;
 608         }
 609
 610         device_create_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 611         device_create_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 612         device_create_file(&of_dev->dev, &dev_attr_sensor1_limit);
 613         device_create_file(&of_dev->dev, &dev_attr_sensor2_limit);
 614         device_create_file(&of_dev->dev, &dev_attr_sensor1_location);
 615         device_create_file(&of_dev->dev, &dev_attr_sensor2_location);
 616         device_create_file(&of_dev->dev, &dev_attr_limit_adjust);
 617         device_create_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 618         device_create_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 619         if(therm_type == ADT7460)
 620                 device_create_file(&of_dev->dev, &dev_attr_sensor2_fan_speed);
 621
 622 #ifndef CONFIG_I2C_KEYWEST
 623         request_module("i2c-keywest");
 624 #endif
 625
 626         return i2c_add_driver(&thermostat_driver);
 627 }
 628
 629 static void __exit
 630 thermostat_exit(void)
 631 {
 632         if (of_dev) {
 633                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 634                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 635                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_limit);
 636                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_limit);
 637                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_location);
 638                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_location);
 639                 device_remove_file(&of_dev->dev, &dev_attr_limit_adjust);
 640                 device_remove_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 641                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 642
 643                 if(therm_type == ADT7460)
 644                         device_remove_file(&of_dev->dev,
 645                                            &dev_attr_sensor2_fan_speed);
 646
 647                 of_device_unregister(of_dev);
 648         }
 649         i2c_del_driver(&thermostat_driver);
 650 }
 651
 652 module_init(thermostat_init);
 653 module_exit(thermostat_exit);