err.no Git - linux-2.6/blob - 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         .attach_adapter = attach_thermostat,
 177         .detach_adapter = detach_thermostat,
 178 };
 179
 180 static int read_fan_speed(struct thermostat *th, u8 addr)
 181 {
 182         u8 tmp[2];
 183         u16 res;
 184
 185         /* should start with low byte */
 186         tmp[1] = read_reg(th, addr);
 187         tmp[0] = read_reg(th, addr + 1);
 188
 189         res = tmp[1] + (tmp[0] << 8);
 190         /* "a value of 0xffff means that the fan has stopped" */
 191         return (res == 0xffff ? 0 : (90000*60)/res);
 192 }
 193
 194 static void write_both_fan_speed(struct thermostat *th, int speed)
 195 {
 196         write_fan_speed(th, speed, 0);
 197         if (therm_type == ADT7460)
 198                 write_fan_speed(th, speed, 1);
 199 }
 200
 201 static void write_fan_speed(struct thermostat *th, int speed, int fan)
 202 {
 203         u8 manual;
 204
 205         if (speed > 0xff)
 206                 speed = 0xff;
 207         else if (speed < -1)
 208                 speed = 0;
 209
 210         if (therm_type == ADT7467 && fan == 1)
 211                 return;
 212
 213         if (th->last_speed[fan] != speed) {
 214                 if (speed == -1)
 215                         printk(KERN_DEBUG "adt746x: Setting speed to automatic "
 216                                 "for %s fan.\n", sensor_location[fan+1]);
 217                 else
 218                         printk(KERN_DEBUG "adt746x: Setting speed to %d "
 219                                 "for %s fan.\n", speed, sensor_location[fan+1]);
 220         } else
 221                 return;
 222
 223         if (speed >= 0) {
 224                 manual = read_reg(th, MANUAL_MODE[fan]);
 225                 write_reg(th, MANUAL_MODE[fan], manual|MANUAL_MASK);
 226                 write_reg(th, FAN_SPD_SET[fan], speed);
 227         } else {
 228                 /* back to automatic */
 229                 if(therm_type == ADT7460) {
 230                         manual = read_reg(th,
 231                                 MANUAL_MODE[fan]) & (~MANUAL_MASK);
 232
 233                         write_reg(th,
 234                                 MANUAL_MODE[fan], manual|REM_CONTROL[fan]);
 235                 } else {
 236                         manual = read_reg(th, MANUAL_MODE[fan]);
 237                         write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK));
 238                 }
 239         }
 240
 241         th->last_speed[fan] = speed;
 242 }
 243
 244 static void read_sensors(struct thermostat *th)
 245 {
 246         int i = 0;
 247
 248         for (i = 0; i < 3; i++)
 249                 th->temps[i]  = read_reg(th, TEMP_REG[i]);
 250 }
 251
 252 #ifdef DEBUG
 253 static void display_stats(struct thermostat *th)
 254 {
 255         if (th->temps[0] != th->cached_temp[0]
 256         ||  th->temps[1] != th->cached_temp[1]
 257         ||  th->temps[2] != th->cached_temp[2]) {
 258                 printk(KERN_INFO "adt746x: Temperature infos:"
 259                                  " thermostats: %d,%d,%d;"
 260                                  " limits: %d,%d,%d;"
 261                                  " fan speed: %d RPM\n",
 262                                  th->temps[0], th->temps[1], th->temps[2],
 263                                  th->limits[0],  th->limits[1],  th->limits[2],
 264                                  read_fan_speed(th, FAN_SPEED[0]));
 265         }
 266         th->cached_temp[0] = th->temps[0];
 267         th->cached_temp[1] = th->temps[1];
 268         th->cached_temp[2] = th->temps[2];
 269 }
 270 #endif
 271
 272 static void update_fans_speed (struct thermostat *th)
 273 {
 274         int lastvar = 0; /* last variation, for iBook */
 275         int i = 0;
 276
 277         /* we don't care about local sensor, so we start at sensor 1 */
 278         for (i = 1; i < 3; i++) {
 279                 int started = 0;
 280                 int fan_number = (therm_type == ADT7460 && i == 2);
 281                 int var = th->temps[i] - th->limits[i];
 282
 283                 if (var > -1) {
 284                         int step = (255 - fan_speed) / 7;
 285                         int new_speed = 0;
 286
 287                         /* hysteresis : change fan speed only if variation is
 288                          * more than two degrees */
 289                         if (abs(var - th->last_var[fan_number]) < 2)
 290                                 continue;
 291
 292                         started = 1;
 293                         new_speed = fan_speed + ((var-1)*step);
 294
 295                         if (new_speed < fan_speed)
 296                                 new_speed = fan_speed;
 297                         if (new_speed > 255)
 298                                 new_speed = 255;
 299
 300                         printk(KERN_DEBUG "adt746x: setting fans speed to %d "
 301                                          "(limit exceeded by %d on %s) \n",
 302                                         new_speed, var,
 303                                         sensor_location[fan_number+1]);
 304                         write_both_fan_speed(th, new_speed);
 305                         th->last_var[fan_number] = var;
 306                 } else if (var < -2) {
 307                         /* don't stop fan if sensor2 is cold and sensor1 is not
 308                          * so cold (lastvar >= -1) */
 309                         if (i == 2 && lastvar < -1) {
 310                                 if (th->last_speed[fan_number] != 0)
 311                                         printk(KERN_DEBUG "adt746x: Stopping "
 312                                                 "fans.\n");
 313                                 write_both_fan_speed(th, 0);
 314                         }
 315                 }
 316
 317                 lastvar = var;
 318
 319                 if (started)
 320                         return; /* we don't want to re-stop the fan
 321                                 * if sensor1 is heating and sensor2 is not */
 322         }
 323 }
 324
 325 static int monitor_task(void *arg)
 326 {
 327         struct thermostat* th = arg;
 328
 329         while(!kthread_should_stop()) {
 330                 try_to_freeze();
 331                 msleep_interruptible(2000);
 332
 333 #ifndef DEBUG
 334                 if (fan_speed != -1)
 335                         read_sensors(th);
 336 #else
 337                 read_sensors(th);
 338 #endif
 339
 340                 if (fan_speed != -1)
 341                         update_fans_speed(th);
 342
 343 #ifdef DEBUG
 344                 display_stats(th);
 345 #endif
 346
 347         }
 348
 349         return 0;
 350 }
 351
 352 static void set_limit(struct thermostat *th, int i)
 353 {
 354                 /* Set sensor1 limit higher to avoid powerdowns */
 355                 th->limits[i] = default_limits_chip[i] + limit_adjust;
 356                 write_reg(th, LIMIT_REG[i], th->limits[i]);
 357
 358                 /* set our limits to normal */
 359                 th->limits[i] = default_limits_local[i] + limit_adjust;
 360 }
 361
 362 static int attach_one_thermostat(struct i2c_adapter *adapter, int addr,
 363                                  int busno)
 364 {
 365         struct thermostat* th;
 366         int rc;
 367         int i;
 368
 369         if (thermostat)
 370                 return 0;
 371
 372         th = (struct thermostat *)
 373                 kmalloc(sizeof(struct thermostat), GFP_KERNEL);
 374
 375         if (!th)
 376                 return -ENOMEM;
 377
 378         memset(th, 0, sizeof(*th));
 379         th->clt.addr = addr;
 380         th->clt.adapter = adapter;
 381         th->clt.driver = &thermostat_driver;
 382         strcpy(th->clt.name, "thermostat");
 383
 384         rc = read_reg(th, 0);
 385         if (rc < 0) {
 386                 printk(KERN_ERR "adt746x: Thermostat failed to read config "
 387                                 "from bus %d !\n",
 388                                 busno);
 389                 kfree(th);
 390                 return -ENODEV;
 391         }
 392
 393         /* force manual control to start the fan quieter */
 394         if (fan_speed == -1)
 395                 fan_speed = 64;
 396
 397         if(therm_type == ADT7460) {
 398                 printk(KERN_INFO "adt746x: ADT7460 initializing\n");
 399                 /* The 7460 needs to be started explicitly */
 400                 write_reg(th, CONFIG_REG, 1);
 401         } else
 402                 printk(KERN_INFO "adt746x: ADT7467 initializing\n");
 403
 404         for (i = 0; i < 3; i++) {
 405                 th->initial_limits[i] = read_reg(th, LIMIT_REG[i]);
 406                 set_limit(th, i);
 407         }
 408
 409         printk(KERN_INFO "adt746x: Lowering max temperatures from %d, %d, %d"
 410                          " to %d, %d, %d\n",
 411                          th->initial_limits[0], th->initial_limits[1],
 412                          th->initial_limits[2], th->limits[0], th->limits[1],
 413                          th->limits[2]);
 414
 415         thermostat = th;
 416
 417         if (i2c_attach_client(&th->clt)) {
 418                 printk(KERN_INFO "adt746x: Thermostat failed to attach "
 419                                  "client !\n");
 420                 thermostat = NULL;
 421                 kfree(th);
 422                 return -ENODEV;
 423         }
 424
 425         /* be sure to really write fan speed the first time */
 426         th->last_speed[0] = -2;
 427         th->last_speed[1] = -2;
 428         th->last_var[0] = -80;
 429         th->last_var[1] = -80;
 430
 431         if (fan_speed != -1) {
 432                 /* manual mode, stop fans */
 433                 write_both_fan_speed(th, 0);
 434         } else {
 435                 /* automatic mode */
 436                 write_both_fan_speed(th, -1);
 437         }
 438
 439         thread_therm = kthread_run(monitor_task, th, "kfand");
 440
 441         if (thread_therm == ERR_PTR(-ENOMEM)) {
 442                 printk(KERN_INFO "adt746x: Kthread creation failed\n");
 443                 thread_therm = NULL;
 444                 return -ENOMEM;
 445         }
 446
 447         return 0;
 448 }
 449
 450 /*
 451  * Now, unfortunately, sysfs doesn't give us a nice void * we could
 452  * pass around to the attribute functions, so we don't really have
 453  * choice but implement a bunch of them...
 454  *
 455  * FIXME, it does now...
 456  */
 457 #define BUILD_SHOW_FUNC_INT(name, data)                         \
 458 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)        \
 459 {                                                               \
 460         return sprintf(buf, "%d\n", data);                      \
 461 }
 462
 463 #define BUILD_SHOW_FUNC_STR(name, data)                         \
 464 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)       \
 465 {                                                               \
 466         return sprintf(buf, "%s\n", data);                      \
 467 }
 468
 469 #define BUILD_SHOW_FUNC_FAN(name, data)                         \
 470 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)       \
 471 {                                                               \
 472         return sprintf(buf, "%d (%d rpm)\n",                    \
 473                 thermostat->last_speed[data],                   \
 474                 read_fan_speed(thermostat, FAN_SPEED[data])     \
 475                 );                                              \
 476 }
 477
 478 #define BUILD_STORE_FUNC_DEG(name, data)                        \
 479 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
 480 {                                                               \
 481         int val;                                                \
 482         int i;                                                  \
 483         val = simple_strtol(buf, NULL, 10);                     \
 484         printk(KERN_INFO "Adjusting limits by %d degrees\n", val);      \
 485         limit_adjust = val;                                     \
 486         for (i=0; i < 3; i++)                                   \
 487                 set_limit(thermostat, i);                       \
 488         return n;                                               \
 489 }
 490
 491 #define BUILD_STORE_FUNC_INT(name, data)                        \
 492 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
 493 {                                                               \
 494         u32 val;                                                \
 495         val = simple_strtoul(buf, NULL, 10);                    \
 496         if (val < 0 || val > 255)                               \
 497                 return -EINVAL;                                 \
 498         printk(KERN_INFO "Setting specified fan speed to %d\n", val);   \
 499         data = val;                                             \
 500         return n;                                               \
 501 }
 502
 503 BUILD_SHOW_FUNC_INT(sensor1_temperature,         (read_reg(thermostat, TEMP_REG[1])))
 504 BUILD_SHOW_FUNC_INT(sensor2_temperature,         (read_reg(thermostat, TEMP_REG[2])))
 505 BUILD_SHOW_FUNC_INT(sensor1_limit,               thermostat->limits[1])
 506 BUILD_SHOW_FUNC_INT(sensor2_limit,               thermostat->limits[2])
 507 BUILD_SHOW_FUNC_STR(sensor1_location,            sensor_location[1])
 508 BUILD_SHOW_FUNC_STR(sensor2_location,            sensor_location[2])
 509
 510 BUILD_SHOW_FUNC_INT(specified_fan_speed, fan_speed)
 511 BUILD_SHOW_FUNC_FAN(sensor1_fan_speed,   0)
 512 BUILD_SHOW_FUNC_FAN(sensor2_fan_speed,   1)
 513
 514 BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed)
 515 BUILD_SHOW_FUNC_INT(limit_adjust,        limit_adjust)
 516 BUILD_STORE_FUNC_DEG(limit_adjust,       thermostat)
 517
 518 static DEVICE_ATTR(sensor1_temperature, S_IRUGO,
 519                    show_sensor1_temperature,NULL);
 520 static DEVICE_ATTR(sensor2_temperature, S_IRUGO,
 521                    show_sensor2_temperature,NULL);
 522 static DEVICE_ATTR(sensor1_limit, S_IRUGO,
 523                    show_sensor1_limit,  NULL);
 524 static DEVICE_ATTR(sensor2_limit, S_IRUGO,
 525                    show_sensor2_limit,  NULL);
 526 static DEVICE_ATTR(sensor1_location, S_IRUGO,
 527                    show_sensor1_location, NULL);
 528 static DEVICE_ATTR(sensor2_location, S_IRUGO,
 529                    show_sensor2_location, NULL);
 530
 531 static DEVICE_ATTR(specified_fan_speed, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 532                    show_specified_fan_speed,store_specified_fan_speed);
 533
 534 static DEVICE_ATTR(sensor1_fan_speed,   S_IRUGO,
 535                    show_sensor1_fan_speed,      NULL);
 536 static DEVICE_ATTR(sensor2_fan_speed,   S_IRUGO,
 537                    show_sensor2_fan_speed,      NULL);
 538
 539 static DEVICE_ATTR(limit_adjust,        S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 540                    show_limit_adjust,   store_limit_adjust);
 541
 542
 543 static int __init
 544 thermostat_init(void)
 545 {
 546         struct device_node* np;
 547         u32 *prop;
 548         int i = 0, offset = 0;
 549
 550         np = of_find_node_by_name(NULL, "fan");
 551         if (!np)
 552                 return -ENODEV;
 553         if (device_is_compatible(np, "adt7460"))
 554                 therm_type = ADT7460;
 555         else if (device_is_compatible(np, "adt7467"))
 556                 therm_type = ADT7467;
 557         else
 558                 return -ENODEV;
 559
 560         prop = (u32 *)get_property(np, "hwsensor-params-version", NULL);
 561         printk(KERN_INFO "adt746x: version %d (%ssupported)\n", *prop,
 562                          (*prop == 1)?"":"un");
 563         if (*prop != 1)
 564                 return -ENODEV;
 565
 566         prop = (u32 *)get_property(np, "reg", NULL);
 567         if (!prop)
 568                 return -ENODEV;
 569
 570         /* look for bus either by path or using "reg" */
 571         if (strstr(np->full_name, "/i2c-bus@") != NULL) {
 572                 const char *tmp_bus = (strstr(np->full_name, "/i2c-bus@") + 9);
 573                 therm_bus = tmp_bus[0]-'0';
 574         } else {
 575                 therm_bus = ((*prop) >> 8) & 0x0f;
 576         }
 577
 578         therm_address = ((*prop) & 0xff) >> 1;
 579
 580         printk(KERN_INFO "adt746x: Thermostat bus: %d, address: 0x%02x, "
 581                          "limit_adjust: %d, fan_speed: %d\n",
 582                          therm_bus, therm_address, limit_adjust, fan_speed);
 583
 584         if (get_property(np, "hwsensor-location", NULL)) {
 585                 for (i = 0; i < 3; i++) {
 586                         sensor_location[i] = get_property(np,
 587                                         "hwsensor-location", NULL) + offset;
 588
 589                         if (sensor_location[i] == NULL)
 590                                 sensor_location[i] = "";
 591
 592                         printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]);
 593                         offset += strlen(sensor_location[i]) + 1;
 594                 }
 595         } else {
 596                 sensor_location[0] = "?";
 597                 sensor_location[1] = "?";
 598                 sensor_location[2] = "?";
 599         }
 600
 601         of_dev = of_platform_device_create(np, "temperatures", NULL);
 602
 603         if (of_dev == NULL) {
 604                 printk(KERN_ERR "Can't register temperatures device !\n");
 605                 return -ENODEV;
 606         }
 607
 608         device_create_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 609         device_create_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 610         device_create_file(&of_dev->dev, &dev_attr_sensor1_limit);
 611         device_create_file(&of_dev->dev, &dev_attr_sensor2_limit);
 612         device_create_file(&of_dev->dev, &dev_attr_sensor1_location);
 613         device_create_file(&of_dev->dev, &dev_attr_sensor2_location);
 614         device_create_file(&of_dev->dev, &dev_attr_limit_adjust);
 615         device_create_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 616         device_create_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 617         if(therm_type == ADT7460)
 618                 device_create_file(&of_dev->dev, &dev_attr_sensor2_fan_speed);
 619
 620 #ifndef CONFIG_I2C_KEYWEST
 621         request_module("i2c-keywest");
 622 #endif
 623
 624         return i2c_add_driver(&thermostat_driver);
 625 }
 626
 627 static void __exit
 628 thermostat_exit(void)
 629 {
 630         if (of_dev) {
 631                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 632                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 633                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_limit);
 634                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_limit);
 635                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_location);
 636                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_location);
 637                 device_remove_file(&of_dev->dev, &dev_attr_limit_adjust);
 638                 device_remove_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 639                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 640
 641                 if(therm_type == ADT7460)
 642                         device_remove_file(&of_dev->dev,
 643                                            &dev_attr_sensor2_fan_speed);
 644
 645                 of_device_unregister(of_dev);
 646         }
 647         i2c_del_driver(&thermostat_driver);
 648 }
 649
 650 module_init(thermostat_init);
 651 module_exit(thermostat_exit);