git.oblomov.eu 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/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 #include <linux/of_platform.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
  35 #undef DEBUG
  36
  37 #define CONFIG_REG   0x40
  38 #define MANUAL_MASK  0xe0
  39 #define AUTO_MASK    0x20
  40 #define INVERT_MASK  0x10
  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 const char *sensor_location[3];
  52
  53 static int limit_adjust;
  54 static int fan_speed = -1;
  55 static int verbose;
  56
  57 MODULE_AUTHOR("Colin Leroy <colin@colino.net>");
  58 MODULE_DESCRIPTION("Driver for ADT746x thermostat in iBook G4 and "
  59                    "Powerbook G4 Alu");
  60 MODULE_LICENSE("GPL");
  61
  62 module_param(limit_adjust, int, 0644);
  63 MODULE_PARM_DESC(limit_adjust,"Adjust maximum temperatures (50 sensor1, 70 sensor2) "
  64                  "by N degrees.");
  65
  66 module_param(fan_speed, int, 0644);
  67 MODULE_PARM_DESC(fan_speed,"Specify starting fan speed (0-255) "
  68                  "(default 64)");
  69
  70 module_param(verbose, bool, 0);
  71 MODULE_PARM_DESC(verbose,"Verbose log operations "
  72                  "(default 0)");
  73
  74 struct thermostat {
  75         struct i2c_client       *clt;
  76         u8                      temps[3];
  77         u8                      cached_temp[3];
  78         u8                      initial_limits[3];
  79         u8                      limits[3];
  80         int                     last_speed[2];
  81         int                     last_var[2];
  82 };
  83
  84 static enum {ADT7460, ADT7467} therm_type;
  85 static int therm_bus, therm_address;
  86 static struct of_device * of_dev;
  87 static struct thermostat* thermostat;
  88 static struct task_struct *thread_therm = NULL;
  89
  90 static void write_both_fan_speed(struct thermostat *th, int speed);
  91 static void write_fan_speed(struct thermostat *th, int speed, int fan);
  92
  93 static int
  94 write_reg(struct thermostat* th, int reg, u8 data)
  95 {
  96         u8 tmp[2];
  97         int rc;
  98
  99         tmp[0] = reg;
 100         tmp[1] = data;
 101         rc = i2c_master_send(th->clt, (const char *)tmp, 2);
 102         if (rc < 0)
 103                 return rc;
 104         if (rc != 2)
 105                 return -ENODEV;
 106         return 0;
 107 }
 108
 109 static int
 110 read_reg(struct thermostat* th, int reg)
 111 {
 112         u8 reg_addr, data;
 113         int rc;
 114
 115         reg_addr = (u8)reg;
 116         rc = i2c_master_send(th->clt, &reg_addr, 1);
 117         if (rc < 0)
 118                 return rc;
 119         if (rc != 1)
 120                 return -ENODEV;
 121         rc = i2c_master_recv(th->clt, (char *)&data, 1);
 122         if (rc < 0)
 123                 return rc;
 124         return data;
 125 }
 126
 127 static int
 128 attach_thermostat(struct i2c_adapter *adapter)
 129 {
 130         unsigned long bus_no;
 131         struct i2c_board_info info;
 132         struct i2c_client *client;
 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
 140         memset(&info, 0, sizeof(struct i2c_board_info));
 141         strlcpy(info.type, "therm_adt746x", I2C_NAME_SIZE);
 142         info.addr = therm_address;
 143         client = i2c_new_device(adapter, &info);
 144         if (!client)
 145                 return -ENODEV;
 146
 147         /*
 148          * Let i2c-core delete that device on driver removal.
 149          * This is safe because i2c-core holds the core_lock mutex for us.
 150          */
 151         list_add_tail(&client->detected, &client->driver->clients);
 152         return 0;
 153 }
 154
 155 static int
 156 remove_thermostat(struct i2c_client *client)
 157 {
 158         struct thermostat *th = i2c_get_clientdata(client);
 159         int i;
 160
 161         if (thread_therm != NULL) {
 162                 kthread_stop(thread_therm);
 163         }
 164
 165         printk(KERN_INFO "adt746x: Putting max temperatures back from "
 166                          "%d, %d, %d to %d, %d, %d\n",
 167                 th->limits[0], th->limits[1], th->limits[2],
 168                 th->initial_limits[0], th->initial_limits[1],
 169                 th->initial_limits[2]);
 170
 171         for (i = 0; i < 3; i++)
 172                 write_reg(th, LIMIT_REG[i], th->initial_limits[i]);
 173
 174         write_both_fan_speed(th, -1);
 175
 176         thermostat = NULL;
 177
 178         kfree(th);
 179
 180         return 0;
 181 }
 182
 183 static int read_fan_speed(struct thermostat *th, u8 addr)
 184 {
 185         u8 tmp[2];
 186         u16 res;
 187
 188         /* should start with low byte */
 189         tmp[1] = read_reg(th, addr);
 190         tmp[0] = read_reg(th, addr + 1);
 191
 192         res = tmp[1] + (tmp[0] << 8);
 193         /* "a value of 0xffff means that the fan has stopped" */
 194         return (res == 0xffff ? 0 : (90000*60)/res);
 195 }
 196
 197 static void write_both_fan_speed(struct thermostat *th, int speed)
 198 {
 199         write_fan_speed(th, speed, 0);
 200         if (therm_type == ADT7460)
 201                 write_fan_speed(th, speed, 1);
 202 }
 203
 204 static void write_fan_speed(struct thermostat *th, int speed, int fan)
 205 {
 206         u8 manual;
 207
 208         if (speed > 0xff)
 209                 speed = 0xff;
 210         else if (speed < -1)
 211                 speed = 0;
 212
 213         if (therm_type == ADT7467 && fan == 1)
 214                 return;
 215
 216         if (th->last_speed[fan] != speed) {
 217                 if (verbose) {
 218                         if (speed == -1)
 219                                 printk(KERN_DEBUG "adt746x: Setting speed to automatic "
 220                                         "for %s fan.\n", sensor_location[fan+1]);
 221                         else
 222                                 printk(KERN_DEBUG "adt746x: Setting speed to %d "
 223                                         "for %s fan.\n", speed, sensor_location[fan+1]);
 224                 }
 225         } else
 226                 return;
 227
 228         if (speed >= 0) {
 229                 manual = read_reg(th, MANUAL_MODE[fan]);
 230                 write_reg(th, MANUAL_MODE[fan],
 231                         (manual|MANUAL_MASK) & (~INVERT_MASK));
 232                 write_reg(th, FAN_SPD_SET[fan], speed);
 233         } else {
 234                 /* back to automatic */
 235                 if(therm_type == ADT7460) {
 236                         manual = read_reg(th,
 237                                 MANUAL_MODE[fan]) & (~MANUAL_MASK);
 238
 239                         write_reg(th,
 240                                 MANUAL_MODE[fan], manual|REM_CONTROL[fan]);
 241                 } else {
 242                         manual = read_reg(th, MANUAL_MODE[fan]);
 243                         write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK));
 244                 }
 245         }
 246
 247         th->last_speed[fan] = speed;
 248 }
 249
 250 static void read_sensors(struct thermostat *th)
 251 {
 252         int i = 0;
 253
 254         for (i = 0; i < 3; i++)
 255                 th->temps[i]  = read_reg(th, TEMP_REG[i]);
 256 }
 257
 258 #ifdef DEBUG
 259 static void display_stats(struct thermostat *th)
 260 {
 261         if (th->temps[0] != th->cached_temp[0]
 262         ||  th->temps[1] != th->cached_temp[1]
 263         ||  th->temps[2] != th->cached_temp[2]) {
 264                 printk(KERN_INFO "adt746x: Temperature infos:"
 265                                  " thermostats: %d,%d,%d;"
 266                                  " limits: %d,%d,%d;"
 267                                  " fan speed: %d RPM\n",
 268                                  th->temps[0], th->temps[1], th->temps[2],
 269                                  th->limits[0],  th->limits[1],  th->limits[2],
 270                                  read_fan_speed(th, FAN_SPEED[0]));
 271         }
 272         th->cached_temp[0] = th->temps[0];
 273         th->cached_temp[1] = th->temps[1];
 274         th->cached_temp[2] = th->temps[2];
 275 }
 276 #endif
 277
 278 static void update_fans_speed (struct thermostat *th)
 279 {
 280         int lastvar = 0; /* last variation, for iBook */
 281         int i = 0;
 282
 283         /* we don't care about local sensor, so we start at sensor 1 */
 284         for (i = 1; i < 3; i++) {
 285                 int started = 0;
 286                 int fan_number = (therm_type == ADT7460 && i == 2);
 287                 int var = th->temps[i] - th->limits[i];
 288
 289                 if (var > -1) {
 290                         int step = (255 - fan_speed) / 7;
 291                         int new_speed = 0;
 292
 293                         /* hysteresis : change fan speed only if variation is
 294                          * more than two degrees */
 295                         if (abs(var - th->last_var[fan_number]) < 2)
 296                                 continue;
 297
 298                         started = 1;
 299                         new_speed = fan_speed + ((var-1)*step);
 300
 301                         if (new_speed < fan_speed)
 302                                 new_speed = fan_speed;
 303                         if (new_speed > 255)
 304                                 new_speed = 255;
 305
 306                         if (verbose)
 307                                 printk(KERN_DEBUG "adt746x: Setting fans speed to %d "
 308                                                  "(limit exceeded by %d on %s) \n",
 309                                                 new_speed, var,
 310                                                 sensor_location[fan_number+1]);
 311                         write_both_fan_speed(th, new_speed);
 312                         th->last_var[fan_number] = var;
 313                 } else if (var < -2) {
 314                         /* don't stop fan if sensor2 is cold and sensor1 is not
 315                          * so cold (lastvar >= -1) */
 316                         if (i == 2 && lastvar < -1) {
 317                                 if (th->last_speed[fan_number] != 0)
 318                                         if (verbose)
 319                                                 printk(KERN_DEBUG "adt746x: Stopping "
 320                                                         "fans.\n");
 321                                 write_both_fan_speed(th, 0);
 322                         }
 323                 }
 324
 325                 lastvar = var;
 326
 327                 if (started)
 328                         return; /* we don't want to re-stop the fan
 329                                 * if sensor1 is heating and sensor2 is not */
 330         }
 331 }
 332
 333 static int monitor_task(void *arg)
 334 {
 335         struct thermostat* th = arg;
 336
 337         set_freezable();
 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 probe_thermostat(struct i2c_client *client,
 372                             const struct i2c_device_id *id)
 373 {
 374         struct thermostat* th;
 375         int rc;
 376         int i;
 377
 378         if (thermostat)
 379                 return 0;
 380
 381         th = kzalloc(sizeof(struct thermostat), GFP_KERNEL);
 382         if (!th)
 383                 return -ENOMEM;
 384
 385         i2c_set_clientdata(client, th);
 386         th->clt = client;
 387
 388         rc = read_reg(th, 0);
 389         if (rc < 0) {
 390                 dev_err(&client->dev, "Thermostat failed to read config!\n");
 391                 kfree(th);
 392                 return -ENODEV;
 393         }
 394
 395         /* force manual control to start the fan quieter */
 396         if (fan_speed == -1)
 397                 fan_speed = 64;
 398
 399         if(therm_type == ADT7460) {
 400                 printk(KERN_INFO "adt746x: ADT7460 initializing\n");
 401                 /* The 7460 needs to be started explicitly */
 402                 write_reg(th, CONFIG_REG, 1);
 403         } else
 404                 printk(KERN_INFO "adt746x: ADT7467 initializing\n");
 405
 406         for (i = 0; i < 3; i++) {
 407                 th->initial_limits[i] = read_reg(th, LIMIT_REG[i]);
 408                 set_limit(th, i);
 409         }
 410
 411         printk(KERN_INFO "adt746x: Lowering max temperatures from %d, %d, %d"
 412                          " to %d, %d, %d\n",
 413                          th->initial_limits[0], th->initial_limits[1],
 414                          th->initial_limits[2], th->limits[0], th->limits[1],
 415                          th->limits[2]);
 416
 417         thermostat = th;
 418
 419         /* be sure to really write fan speed the first time */
 420         th->last_speed[0] = -2;
 421         th->last_speed[1] = -2;
 422         th->last_var[0] = -80;
 423         th->last_var[1] = -80;
 424
 425         if (fan_speed != -1) {
 426                 /* manual mode, stop fans */
 427                 write_both_fan_speed(th, 0);
 428         } else {
 429                 /* automatic mode */
 430                 write_both_fan_speed(th, -1);
 431         }
 432
 433         thread_therm = kthread_run(monitor_task, th, "kfand");
 434
 435         if (thread_therm == ERR_PTR(-ENOMEM)) {
 436                 printk(KERN_INFO "adt746x: Kthread creation failed\n");
 437                 thread_therm = NULL;
 438                 return -ENOMEM;
 439         }
 440
 441         return 0;
 442 }
 443
 444 static const struct i2c_device_id therm_adt746x_id[] = {
 445         { "therm_adt746x", 0 },
 446         { }
 447 };
 448
 449 static struct i2c_driver thermostat_driver = {
 450         .driver = {
 451                 .name   = "therm_adt746x",
 452         },
 453         .attach_adapter = attach_thermostat,
 454         .probe = probe_thermostat,
 455         .remove = remove_thermostat,
 456         .id_table = therm_adt746x_id,
 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         int val;                                                \
 504         val = simple_strtol(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         int err;
 559
 560         np = of_find_node_by_name(NULL, "fan");
 561         if (!np)
 562                 return -ENODEV;
 563         if (of_device_is_compatible(np, "adt7460"))
 564                 therm_type = ADT7460;
 565         else if (of_device_is_compatible(np, "adt7467"))
 566                 therm_type = ADT7467;
 567         else {
 568                 of_node_put(np);
 569                 return -ENODEV;
 570         }
 571
 572         prop = of_get_property(np, "hwsensor-params-version", NULL);
 573         printk(KERN_INFO "adt746x: version %d (%ssupported)\n", *prop,
 574                          (*prop == 1)?"":"un");
 575         if (*prop != 1) {
 576                 of_node_put(np);
 577                 return -ENODEV;
 578         }
 579
 580         prop = of_get_property(np, "reg", NULL);
 581         if (!prop) {
 582                 of_node_put(np);
 583                 return -ENODEV;
 584         }
 585
 586         /* look for bus either by path or using "reg" */
 587         if (strstr(np->full_name, "/i2c-bus@") != NULL) {
 588                 const char *tmp_bus = (strstr(np->full_name, "/i2c-bus@") + 9);
 589                 therm_bus = tmp_bus[0]-'0';
 590         } else {
 591                 therm_bus = ((*prop) >> 8) & 0x0f;
 592         }
 593
 594         therm_address = ((*prop) & 0xff) >> 1;
 595
 596         printk(KERN_INFO "adt746x: Thermostat bus: %d, address: 0x%02x, "
 597                          "limit_adjust: %d, fan_speed: %d\n",
 598                          therm_bus, therm_address, limit_adjust, fan_speed);
 599
 600         if (of_get_property(np, "hwsensor-location", NULL)) {
 601                 for (i = 0; i < 3; i++) {
 602                         sensor_location[i] = of_get_property(np,
 603                                         "hwsensor-location", NULL) + offset;
 604
 605                         if (sensor_location[i] == NULL)
 606                                 sensor_location[i] = "";
 607
 608                         printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]);
 609                         offset += strlen(sensor_location[i]) + 1;
 610                 }
 611         } else {
 612                 sensor_location[0] = "?";
 613                 sensor_location[1] = "?";
 614                 sensor_location[2] = "?";
 615         }
 616
 617         of_dev = of_platform_device_create(np, "temperatures", NULL);
 618         of_node_put(np);
 619
 620         if (of_dev == NULL) {
 621                 printk(KERN_ERR "Can't register temperatures device !\n");
 622                 return -ENODEV;
 623         }
 624
 625         err = device_create_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 626         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 627         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_limit);
 628         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_limit);
 629         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_location);
 630         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_location);
 631         err |= device_create_file(&of_dev->dev, &dev_attr_limit_adjust);
 632         err |= device_create_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 633         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 634         if(therm_type == ADT7460)
 635                 err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_fan_speed);
 636         if (err)
 637                 printk(KERN_WARNING
 638                         "Failed to create tempertaure attribute file(s).\n");
 639
 640 #ifndef CONFIG_I2C_POWERMAC
 641         request_module("i2c-powermac");
 642 #endif
 643
 644         return i2c_add_driver(&thermostat_driver);
 645 }
 646
 647 static void __exit
 648 thermostat_exit(void)
 649 {
 650         if (of_dev) {
 651                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 652                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 653                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_limit);
 654                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_limit);
 655                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_location);
 656                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_location);
 657                 device_remove_file(&of_dev->dev, &dev_attr_limit_adjust);
 658                 device_remove_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 659                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 660
 661                 if(therm_type == ADT7460)
 662                         device_remove_file(&of_dev->dev,
 663                                            &dev_attr_sensor2_fan_speed);
 664
 665                 of_device_unregister(of_dev);
 666         }
 667         i2c_del_driver(&thermostat_driver);
 668 }
 669
 670 module_init(thermostat_init);
 671 module_exit(thermostat_exit);