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/types.h>
  13 #include <linux/module.h>
  14 #include <linux/errno.h>
  15 #include <linux/kernel.h>
  16 #include <linux/delay.h>
  17 #include <linux/sched.h>
  18 #include <linux/i2c.h>
  19 #include <linux/slab.h>
  20 #include <linux/init.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/wait.h>
  23 #include <linux/suspend.h>
  24 #include <linux/kthread.h>
  25 #include <linux/moduleparam.h>
  26 #include <linux/freezer.h>
  27
  28 #include <asm/prom.h>
  29 #include <asm/machdep.h>
  30 #include <asm/io.h>
  31 #include <asm/system.h>
  32 #include <asm/sections.h>
  33 #include <asm/of_platform.h>
  34
  35 #undef DEBUG
  36
  37 #define CONFIG_REG   0x40
  38 #define MANUAL_MASK  0xe0
  39 #define AUTO_MASK    0x20
  40
  41 static u8 TEMP_REG[3]    = {0x26, 0x25, 0x27}; /* local, sensor1, sensor2 */
  42 static u8 LIMIT_REG[3]   = {0x6b, 0x6a, 0x6c}; /* local, sensor1, sensor2 */
  43 static u8 MANUAL_MODE[2] = {0x5c, 0x5d};
  44 static u8 REM_CONTROL[2] = {0x00, 0x40};
  45 static u8 FAN_SPEED[2]   = {0x28, 0x2a};
  46 static u8 FAN_SPD_SET[2] = {0x30, 0x31};
  47
  48 static u8 default_limits_local[3] = {70, 50, 70};    /* local, sensor1, sensor2 */
  49 static u8 default_limits_chip[3] = {80, 65, 80};    /* local, sensor1, sensor2 */
  50 static const char *sensor_location[3];
  51
  52 static int limit_adjust;
  53 static int fan_speed = -1;
  54 static int verbose;
  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 module_param(verbose, bool, 0);
  70 MODULE_PARM_DESC(verbose,"Verbose log operations "
  71                  "(default 0)");
  72
  73 struct thermostat {
  74         struct i2c_client       clt;
  75         u8                      temps[3];
  76         u8                      cached_temp[3];
  77         u8                      initial_limits[3];
  78         u8                      limits[3];
  79         int                     last_speed[2];
  80         int                     last_var[2];
  81 };
  82
  83 static enum {ADT7460, ADT7467} therm_type;
  84 static int therm_bus, therm_address;
  85 static struct of_device * of_dev;
  86 static struct thermostat* thermostat;
  87 static struct task_struct *thread_therm = NULL;
  88
  89 static int attach_one_thermostat(struct i2c_adapter *adapter, int addr,
  90                                  int busno);
  91
  92 static void write_both_fan_speed(struct thermostat *th, int speed);
  93 static void write_fan_speed(struct thermostat *th, int speed, int fan);
  94
  95 static int
  96 write_reg(struct thermostat* th, int reg, u8 data)
  97 {
  98         u8 tmp[2];
  99         int rc;
 100
 101         tmp[0] = reg;
 102         tmp[1] = data;
 103         rc = i2c_master_send(&th->clt, (const char *)tmp, 2);
 104         if (rc < 0)
 105                 return rc;
 106         if (rc != 2)
 107                 return -ENODEV;
 108         return 0;
 109 }
 110
 111 static int
 112 read_reg(struct thermostat* th, int reg)
 113 {
 114         u8 reg_addr, data;
 115         int rc;
 116
 117         reg_addr = (u8)reg;
 118         rc = i2c_master_send(&th->clt, &reg_addr, 1);
 119         if (rc < 0)
 120                 return rc;
 121         if (rc != 1)
 122                 return -ENODEV;
 123         rc = i2c_master_recv(&th->clt, (char *)&data, 1);
 124         if (rc < 0)
 125                 return rc;
 126         return data;
 127 }
 128
 129 static int
 130 attach_thermostat(struct i2c_adapter *adapter)
 131 {
 132         unsigned long bus_no;
 133
 134         if (strncmp(adapter->name, "uni-n", 5))
 135                 return -ENODEV;
 136         bus_no = simple_strtoul(adapter->name + 6, NULL, 10);
 137         if (bus_no != therm_bus)
 138                 return -ENODEV;
 139         return attach_one_thermostat(adapter, therm_address, bus_no);
 140 }
 141
 142 static int
 143 detach_thermostat(struct i2c_adapter *adapter)
 144 {
 145         struct thermostat* th;
 146         int i;
 147
 148         if (thermostat == NULL)
 149                 return 0;
 150
 151         th = thermostat;
 152
 153         if (thread_therm != NULL) {
 154                 kthread_stop(thread_therm);
 155         }
 156
 157         printk(KERN_INFO "adt746x: Putting max temperatures back from "
 158                          "%d, %d, %d to %d, %d, %d\n",
 159                 th->limits[0], th->limits[1], th->limits[2],
 160                 th->initial_limits[0], th->initial_limits[1],
 161                 th->initial_limits[2]);
 162
 163         for (i = 0; i < 3; i++)
 164                 write_reg(th, LIMIT_REG[i], th->initial_limits[i]);
 165
 166         write_both_fan_speed(th, -1);
 167
 168         i2c_detach_client(&th->clt);
 169
 170         thermostat = NULL;
 171
 172         kfree(th);
 173
 174         return 0;
 175 }
 176
 177 static struct i2c_driver thermostat_driver = {
 178         .driver = {
 179                 .name   = "therm_adt746x",
 180         },
 181         .attach_adapter = attach_thermostat,
 182         .detach_adapter = detach_thermostat,
 183 };
 184
 185 static int read_fan_speed(struct thermostat *th, u8 addr)
 186 {
 187         u8 tmp[2];
 188         u16 res;
 189
 190         /* should start with low byte */
 191         tmp[1] = read_reg(th, addr);
 192         tmp[0] = read_reg(th, addr + 1);
 193
 194         res = tmp[1] + (tmp[0] << 8);
 195         /* "a value of 0xffff means that the fan has stopped" */
 196         return (res == 0xffff ? 0 : (90000*60)/res);
 197 }
 198
 199 static void write_both_fan_speed(struct thermostat *th, int speed)
 200 {
 201         write_fan_speed(th, speed, 0);
 202         if (therm_type == ADT7460)
 203                 write_fan_speed(th, speed, 1);
 204 }
 205
 206 static void write_fan_speed(struct thermostat *th, int speed, int fan)
 207 {
 208         u8 manual;
 209
 210         if (speed > 0xff)
 211                 speed = 0xff;
 212         else if (speed < -1)
 213                 speed = 0;
 214
 215         if (therm_type == ADT7467 && fan == 1)
 216                 return;
 217
 218         if (th->last_speed[fan] != speed) {
 219                 if (verbose) {
 220                         if (speed == -1)
 221                                 printk(KERN_DEBUG "adt746x: Setting speed to automatic "
 222                                         "for %s fan.\n", sensor_location[fan+1]);
 223                         else
 224                                 printk(KERN_DEBUG "adt746x: Setting speed to %d "
 225                                         "for %s fan.\n", speed, sensor_location[fan+1]);
 226                 }
 227         } else
 228                 return;
 229
 230         if (speed >= 0) {
 231                 manual = read_reg(th, MANUAL_MODE[fan]);
 232                 write_reg(th, MANUAL_MODE[fan], manual|MANUAL_MASK);
 233                 write_reg(th, FAN_SPD_SET[fan], speed);
 234         } else {
 235                 /* back to automatic */
 236                 if(therm_type == ADT7460) {
 237                         manual = read_reg(th,
 238                                 MANUAL_MODE[fan]) & (~MANUAL_MASK);
 239
 240                         write_reg(th,
 241                                 MANUAL_MODE[fan], manual|REM_CONTROL[fan]);
 242                 } else {
 243                         manual = read_reg(th, MANUAL_MODE[fan]);
 244                         write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK));
 245                 }
 246         }
 247
 248         th->last_speed[fan] = speed;
 249 }
 250
 251 static void read_sensors(struct thermostat *th)
 252 {
 253         int i = 0;
 254
 255         for (i = 0; i < 3; i++)
 256                 th->temps[i]  = read_reg(th, TEMP_REG[i]);
 257 }
 258
 259 #ifdef DEBUG
 260 static void display_stats(struct thermostat *th)
 261 {
 262         if (th->temps[0] != th->cached_temp[0]
 263         ||  th->temps[1] != th->cached_temp[1]
 264         ||  th->temps[2] != th->cached_temp[2]) {
 265                 printk(KERN_INFO "adt746x: Temperature infos:"
 266                                  " thermostats: %d,%d,%d;"
 267                                  " limits: %d,%d,%d;"
 268                                  " fan speed: %d RPM\n",
 269                                  th->temps[0], th->temps[1], th->temps[2],
 270                                  th->limits[0],  th->limits[1],  th->limits[2],
 271                                  read_fan_speed(th, FAN_SPEED[0]));
 272         }
 273         th->cached_temp[0] = th->temps[0];
 274         th->cached_temp[1] = th->temps[1];
 275         th->cached_temp[2] = th->temps[2];
 276 }
 277 #endif
 278
 279 static void update_fans_speed (struct thermostat *th)
 280 {
 281         int lastvar = 0; /* last variation, for iBook */
 282         int i = 0;
 283
 284         /* we don't care about local sensor, so we start at sensor 1 */
 285         for (i = 1; i < 3; i++) {
 286                 int started = 0;
 287                 int fan_number = (therm_type == ADT7460 && i == 2);
 288                 int var = th->temps[i] - th->limits[i];
 289
 290                 if (var > -1) {
 291                         int step = (255 - fan_speed) / 7;
 292                         int new_speed = 0;
 293
 294                         /* hysteresis : change fan speed only if variation is
 295                          * more than two degrees */
 296                         if (abs(var - th->last_var[fan_number]) < 2)
 297                                 continue;
 298
 299                         started = 1;
 300                         new_speed = fan_speed + ((var-1)*step);
 301
 302                         if (new_speed < fan_speed)
 303                                 new_speed = fan_speed;
 304                         if (new_speed > 255)
 305                                 new_speed = 255;
 306
 307                         if (verbose)
 308                                 printk(KERN_DEBUG "adt746x: Setting fans speed to %d "
 309                                                  "(limit exceeded by %d on %s) \n",
 310                                                 new_speed, var,
 311                                                 sensor_location[fan_number+1]);
 312                         write_both_fan_speed(th, new_speed);
 313                         th->last_var[fan_number] = var;
 314                 } else if (var < -2) {
 315                         /* don't stop fan if sensor2 is cold and sensor1 is not
 316                          * so cold (lastvar >= -1) */
 317                         if (i == 2 && lastvar < -1) {
 318                                 if (th->last_speed[fan_number] != 0)
 319                                         if (verbose)
 320                                                 printk(KERN_DEBUG "adt746x: Stopping "
 321                                                         "fans.\n");
 322                                 write_both_fan_speed(th, 0);
 323                         }
 324                 }
 325
 326                 lastvar = var;
 327
 328                 if (started)
 329                         return; /* we don't want to re-stop the fan
 330                                 * if sensor1 is heating and sensor2 is not */
 331         }
 332 }
 333
 334 static int monitor_task(void *arg)
 335 {
 336         struct thermostat* th = arg;
 337
 338         while(!kthread_should_stop()) {
 339                 try_to_freeze();
 340                 msleep_interruptible(2000);
 341
 342 #ifndef DEBUG
 343                 if (fan_speed != -1)
 344                         read_sensors(th);
 345 #else
 346                 read_sensors(th);
 347 #endif
 348
 349                 if (fan_speed != -1)
 350                         update_fans_speed(th);
 351
 352 #ifdef DEBUG
 353                 display_stats(th);
 354 #endif
 355
 356         }
 357
 358         return 0;
 359 }
 360
 361 static void set_limit(struct thermostat *th, int i)
 362 {
 363                 /* Set sensor1 limit higher to avoid powerdowns */
 364                 th->limits[i] = default_limits_chip[i] + limit_adjust;
 365                 write_reg(th, LIMIT_REG[i], th->limits[i]);
 366
 367                 /* set our limits to normal */
 368                 th->limits[i] = default_limits_local[i] + limit_adjust;
 369 }
 370
 371 static int attach_one_thermostat(struct i2c_adapter *adapter, int addr,
 372                                  int busno)
 373 {
 374         struct thermostat* th;
 375         int rc;
 376         int i;
 377
 378         if (thermostat)
 379                 return 0;
 380
 381         th = (struct thermostat *)
 382                 kmalloc(sizeof(struct thermostat), GFP_KERNEL);
 383
 384         if (!th)
 385                 return -ENOMEM;
 386
 387         memset(th, 0, sizeof(*th));
 388         th->clt.addr = addr;
 389         th->clt.adapter = adapter;
 390         th->clt.driver = &thermostat_driver;
 391         strcpy(th->clt.name, "thermostat");
 392
 393         rc = read_reg(th, 0);
 394         if (rc < 0) {
 395                 printk(KERN_ERR "adt746x: Thermostat failed to read config "
 396                                 "from bus %d !\n",
 397                                 busno);
 398                 kfree(th);
 399                 return -ENODEV;
 400         }
 401
 402         /* force manual control to start the fan quieter */
 403         if (fan_speed == -1)
 404                 fan_speed = 64;
 405
 406         if(therm_type == ADT7460) {
 407                 printk(KERN_INFO "adt746x: ADT7460 initializing\n");
 408                 /* The 7460 needs to be started explicitly */
 409                 write_reg(th, CONFIG_REG, 1);
 410         } else
 411                 printk(KERN_INFO "adt746x: ADT7467 initializing\n");
 412
 413         for (i = 0; i < 3; i++) {
 414                 th->initial_limits[i] = read_reg(th, LIMIT_REG[i]);
 415                 set_limit(th, i);
 416         }
 417
 418         printk(KERN_INFO "adt746x: Lowering max temperatures from %d, %d, %d"
 419                          " to %d, %d, %d\n",
 420                          th->initial_limits[0], th->initial_limits[1],
 421                          th->initial_limits[2], th->limits[0], th->limits[1],
 422                          th->limits[2]);
 423
 424         thermostat = th;
 425
 426         if (i2c_attach_client(&th->clt)) {
 427                 printk(KERN_INFO "adt746x: Thermostat failed to attach "
 428                                  "client !\n");
 429                 thermostat = NULL;
 430                 kfree(th);
 431                 return -ENODEV;
 432         }
 433
 434         /* be sure to really write fan speed the first time */
 435         th->last_speed[0] = -2;
 436         th->last_speed[1] = -2;
 437         th->last_var[0] = -80;
 438         th->last_var[1] = -80;
 439
 440         if (fan_speed != -1) {
 441                 /* manual mode, stop fans */
 442                 write_both_fan_speed(th, 0);
 443         } else {
 444                 /* automatic mode */
 445                 write_both_fan_speed(th, -1);
 446         }
 447
 448         thread_therm = kthread_run(monitor_task, th, "kfand");
 449
 450         if (thread_therm == ERR_PTR(-ENOMEM)) {
 451                 printk(KERN_INFO "adt746x: Kthread creation failed\n");
 452                 thread_therm = NULL;
 453                 return -ENOMEM;
 454         }
 455
 456         return 0;
 457 }
 458
 459 /*
 460  * Now, unfortunately, sysfs doesn't give us a nice void * we could
 461  * pass around to the attribute functions, so we don't really have
 462  * choice but implement a bunch of them...
 463  *
 464  * FIXME, it does now...
 465  */
 466 #define BUILD_SHOW_FUNC_INT(name, data)                         \
 467 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)        \
 468 {                                                               \
 469         return sprintf(buf, "%d\n", data);                      \
 470 }
 471
 472 #define BUILD_SHOW_FUNC_STR(name, data)                         \
 473 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)       \
 474 {                                                               \
 475         return sprintf(buf, "%s\n", data);                      \
 476 }
 477
 478 #define BUILD_SHOW_FUNC_FAN(name, data)                         \
 479 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)       \
 480 {                                                               \
 481         return sprintf(buf, "%d (%d rpm)\n",                    \
 482                 thermostat->last_speed[data],                   \
 483                 read_fan_speed(thermostat, FAN_SPEED[data])     \
 484                 );                                              \
 485 }
 486
 487 #define BUILD_STORE_FUNC_DEG(name, data)                        \
 488 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
 489 {                                                               \
 490         int val;                                                \
 491         int i;                                                  \
 492         val = simple_strtol(buf, NULL, 10);                     \
 493         printk(KERN_INFO "Adjusting limits by %d degrees\n", val);      \
 494         limit_adjust = val;                                     \
 495         for (i=0; i < 3; i++)                                   \
 496                 set_limit(thermostat, i);                       \
 497         return n;                                               \
 498 }
 499
 500 #define BUILD_STORE_FUNC_INT(name, data)                        \
 501 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
 502 {                                                               \
 503         u32 val;                                                \
 504         val = simple_strtoul(buf, NULL, 10);                    \
 505         if (val < 0 || val > 255)                               \
 506                 return -EINVAL;                                 \
 507         printk(KERN_INFO "Setting specified fan speed to %d\n", val);   \
 508         data = val;                                             \
 509         return n;                                               \
 510 }
 511
 512 BUILD_SHOW_FUNC_INT(sensor1_temperature,         (read_reg(thermostat, TEMP_REG[1])))
 513 BUILD_SHOW_FUNC_INT(sensor2_temperature,         (read_reg(thermostat, TEMP_REG[2])))
 514 BUILD_SHOW_FUNC_INT(sensor1_limit,               thermostat->limits[1])
 515 BUILD_SHOW_FUNC_INT(sensor2_limit,               thermostat->limits[2])
 516 BUILD_SHOW_FUNC_STR(sensor1_location,            sensor_location[1])
 517 BUILD_SHOW_FUNC_STR(sensor2_location,            sensor_location[2])
 518
 519 BUILD_SHOW_FUNC_INT(specified_fan_speed, fan_speed)
 520 BUILD_SHOW_FUNC_FAN(sensor1_fan_speed,   0)
 521 BUILD_SHOW_FUNC_FAN(sensor2_fan_speed,   1)
 522
 523 BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed)
 524 BUILD_SHOW_FUNC_INT(limit_adjust,        limit_adjust)
 525 BUILD_STORE_FUNC_DEG(limit_adjust,       thermostat)
 526
 527 static DEVICE_ATTR(sensor1_temperature, S_IRUGO,
 528                    show_sensor1_temperature,NULL);
 529 static DEVICE_ATTR(sensor2_temperature, S_IRUGO,
 530                    show_sensor2_temperature,NULL);
 531 static DEVICE_ATTR(sensor1_limit, S_IRUGO,
 532                    show_sensor1_limit,  NULL);
 533 static DEVICE_ATTR(sensor2_limit, S_IRUGO,
 534                    show_sensor2_limit,  NULL);
 535 static DEVICE_ATTR(sensor1_location, S_IRUGO,
 536                    show_sensor1_location, NULL);
 537 static DEVICE_ATTR(sensor2_location, S_IRUGO,
 538                    show_sensor2_location, NULL);
 539
 540 static DEVICE_ATTR(specified_fan_speed, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 541                    show_specified_fan_speed,store_specified_fan_speed);
 542
 543 static DEVICE_ATTR(sensor1_fan_speed,   S_IRUGO,
 544                    show_sensor1_fan_speed,      NULL);
 545 static DEVICE_ATTR(sensor2_fan_speed,   S_IRUGO,
 546                    show_sensor2_fan_speed,      NULL);
 547
 548 static DEVICE_ATTR(limit_adjust,        S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 549                    show_limit_adjust,   store_limit_adjust);
 550
 551
 552 static int __init
 553 thermostat_init(void)
 554 {
 555         struct device_node* np;
 556         const u32 *prop;
 557         int i = 0, offset = 0;
 558
 559         np = of_find_node_by_name(NULL, "fan");
 560         if (!np)
 561                 return -ENODEV;
 562         if (of_device_is_compatible(np, "adt7460"))
 563                 therm_type = ADT7460;
 564         else if (of_device_is_compatible(np, "adt7467"))
 565                 therm_type = ADT7467;
 566         else
 567                 return -ENODEV;
 568
 569         prop = of_get_property(np, "hwsensor-params-version", NULL);
 570         printk(KERN_INFO "adt746x: version %d (%ssupported)\n", *prop,
 571                          (*prop == 1)?"":"un");
 572         if (*prop != 1)
 573                 return -ENODEV;
 574
 575         prop = of_get_property(np, "reg", NULL);
 576         if (!prop)
 577                 return -ENODEV;
 578
 579         /* look for bus either by path or using "reg" */
 580         if (strstr(np->full_name, "/i2c-bus@") != NULL) {
 581                 const char *tmp_bus = (strstr(np->full_name, "/i2c-bus@") + 9);
 582                 therm_bus = tmp_bus[0]-'0';
 583         } else {
 584                 therm_bus = ((*prop) >> 8) & 0x0f;
 585         }
 586
 587         therm_address = ((*prop) & 0xff) >> 1;
 588
 589         printk(KERN_INFO "adt746x: Thermostat bus: %d, address: 0x%02x, "
 590                          "limit_adjust: %d, fan_speed: %d\n",
 591                          therm_bus, therm_address, limit_adjust, fan_speed);
 592
 593         if (of_get_property(np, "hwsensor-location", NULL)) {
 594                 for (i = 0; i < 3; i++) {
 595                         sensor_location[i] = of_get_property(np,
 596                                         "hwsensor-location", NULL) + offset;
 597
 598                         if (sensor_location[i] == NULL)
 599                                 sensor_location[i] = "";
 600
 601                         printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]);
 602                         offset += strlen(sensor_location[i]) + 1;
 603                 }
 604         } else {
 605                 sensor_location[0] = "?";
 606                 sensor_location[1] = "?";
 607                 sensor_location[2] = "?";
 608         }
 609
 610         of_dev = of_platform_device_create(np, "temperatures", NULL);
 611
 612         if (of_dev == NULL) {
 613                 printk(KERN_ERR "Can't register temperatures device !\n");
 614                 return -ENODEV;
 615         }
 616
 617         device_create_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 618         device_create_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 619         device_create_file(&of_dev->dev, &dev_attr_sensor1_limit);
 620         device_create_file(&of_dev->dev, &dev_attr_sensor2_limit);
 621         device_create_file(&of_dev->dev, &dev_attr_sensor1_location);
 622         device_create_file(&of_dev->dev, &dev_attr_sensor2_location);
 623         device_create_file(&of_dev->dev, &dev_attr_limit_adjust);
 624         device_create_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 625         device_create_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 626         if(therm_type == ADT7460)
 627                 device_create_file(&of_dev->dev, &dev_attr_sensor2_fan_speed);
 628
 629 #ifndef CONFIG_I2C_POWERMAC
 630         request_module("i2c-powermac");
 631 #endif
 632
 633         return i2c_add_driver(&thermostat_driver);
 634 }
 635
 636 static void __exit
 637 thermostat_exit(void)
 638 {
 639         if (of_dev) {
 640                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 641                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 642                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_limit);
 643                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_limit);
 644                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_location);
 645                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_location);
 646                 device_remove_file(&of_dev->dev, &dev_attr_limit_adjust);
 647                 device_remove_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 648                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 649
 650                 if(therm_type == ADT7460)
 651                         device_remove_file(&of_dev->dev,
 652                                            &dev_attr_sensor2_fan_speed);
 653
 654                 of_device_unregister(of_dev);
 655         }
 656         i2c_del_driver(&thermostat_driver);
 657 }
 658
 659 module_init(thermostat_init);
 660 module_exit(thermostat_exit);