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 struct i2c_driver thermostat_driver;
 128
 129 static int
 130 attach_thermostat(struct i2c_adapter *adapter)
 131 {
 132         unsigned long bus_no;
 133         struct i2c_board_info info;
 134         struct i2c_client *client;
 135
 136         if (strncmp(adapter->name, "uni-n", 5))
 137                 return -ENODEV;
 138         bus_no = simple_strtoul(adapter->name + 6, NULL, 10);
 139         if (bus_no != therm_bus)
 140                 return -ENODEV;
 141
 142         memset(&info, 0, sizeof(struct i2c_board_info));
 143         strlcpy(info.type, "therm_adt746x", I2C_NAME_SIZE);
 144         info.addr = therm_address;
 145         client = i2c_new_device(adapter, &info);
 146         if (!client)
 147                 return -ENODEV;
 148
 149         /*
 150          * Let i2c-core delete that device on driver removal.
 151          * This is safe because i2c-core holds the core_lock mutex for us.
 152          */
 153         list_add_tail(&client->detected, &thermostat_driver.clients);
 154         return 0;
 155 }
 156
 157 static int
 158 remove_thermostat(struct i2c_client *client)
 159 {
 160         struct thermostat *th = i2c_get_clientdata(client);
 161         int i;
 162
 163         if (thread_therm != NULL) {
 164                 kthread_stop(thread_therm);
 165         }
 166
 167         printk(KERN_INFO "adt746x: Putting max temperatures back from "
 168                          "%d, %d, %d to %d, %d, %d\n",
 169                 th->limits[0], th->limits[1], th->limits[2],
 170                 th->initial_limits[0], th->initial_limits[1],
 171                 th->initial_limits[2]);
 172
 173         for (i = 0; i < 3; i++)
 174                 write_reg(th, LIMIT_REG[i], th->initial_limits[i]);
 175
 176         write_both_fan_speed(th, -1);
 177
 178         thermostat = NULL;
 179
 180         kfree(th);
 181
 182         return 0;
 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],
 233                         (manual|MANUAL_MASK) & (~INVERT_MASK));
 234                 write_reg(th, FAN_SPD_SET[fan], speed);
 235         } else {
 236                 /* back to automatic */
 237                 if(therm_type == ADT7460) {
 238                         manual = read_reg(th,
 239                                 MANUAL_MODE[fan]) & (~MANUAL_MASK);
 240
 241                         write_reg(th,
 242                                 MANUAL_MODE[fan], manual|REM_CONTROL[fan]);
 243                 } else {
 244                         manual = read_reg(th, MANUAL_MODE[fan]);
 245                         write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK));
 246                 }
 247         }
 248
 249         th->last_speed[fan] = speed;
 250 }
 251
 252 static void read_sensors(struct thermostat *th)
 253 {
 254         int i = 0;
 255
 256         for (i = 0; i < 3; i++)
 257                 th->temps[i]  = read_reg(th, TEMP_REG[i]);
 258 }
 259
 260 #ifdef DEBUG
 261 static void display_stats(struct thermostat *th)
 262 {
 263         if (th->temps[0] != th->cached_temp[0]
 264         ||  th->temps[1] != th->cached_temp[1]
 265         ||  th->temps[2] != th->cached_temp[2]) {
 266                 printk(KERN_INFO "adt746x: Temperature infos:"
 267                                  " thermostats: %d,%d,%d;"
 268                                  " limits: %d,%d,%d;"
 269                                  " fan speed: %d RPM\n",
 270                                  th->temps[0], th->temps[1], th->temps[2],
 271                                  th->limits[0],  th->limits[1],  th->limits[2],
 272                                  read_fan_speed(th, FAN_SPEED[0]));
 273         }
 274         th->cached_temp[0] = th->temps[0];
 275         th->cached_temp[1] = th->temps[1];
 276         th->cached_temp[2] = th->temps[2];
 277 }
 278 #endif
 279
 280 static void update_fans_speed (struct thermostat *th)
 281 {
 282         int lastvar = 0; /* last variation, for iBook */
 283         int i = 0;
 284
 285         /* we don't care about local sensor, so we start at sensor 1 */
 286         for (i = 1; i < 3; i++) {
 287                 int started = 0;
 288                 int fan_number = (therm_type == ADT7460 && i == 2);
 289                 int var = th->temps[i] - th->limits[i];
 290
 291                 if (var > -1) {
 292                         int step = (255 - fan_speed) / 7;
 293                         int new_speed = 0;
 294
 295                         /* hysteresis : change fan speed only if variation is
 296                          * more than two degrees */
 297                         if (abs(var - th->last_var[fan_number]) < 2)
 298                                 continue;
 299
 300                         started = 1;
 301                         new_speed = fan_speed + ((var-1)*step);
 302
 303                         if (new_speed < fan_speed)
 304                                 new_speed = fan_speed;
 305                         if (new_speed > 255)
 306                                 new_speed = 255;
 307
 308                         if (verbose)
 309                                 printk(KERN_DEBUG "adt746x: Setting fans speed to %d "
 310                                                  "(limit exceeded by %d on %s) \n",
 311                                                 new_speed, var,
 312                                                 sensor_location[fan_number+1]);
 313                         write_both_fan_speed(th, new_speed);
 314                         th->last_var[fan_number] = var;
 315                 } else if (var < -2) {
 316                         /* don't stop fan if sensor2 is cold and sensor1 is not
 317                          * so cold (lastvar >= -1) */
 318                         if (i == 2 && lastvar < -1) {
 319                                 if (th->last_speed[fan_number] != 0)
 320                                         if (verbose)
 321                                                 printk(KERN_DEBUG "adt746x: Stopping "
 322                                                         "fans.\n");
 323                                 write_both_fan_speed(th, 0);
 324                         }
 325                 }
 326
 327                 lastvar = var;
 328
 329                 if (started)
 330                         return; /* we don't want to re-stop the fan
 331                                 * if sensor1 is heating and sensor2 is not */
 332         }
 333 }
 334
 335 static int monitor_task(void *arg)
 336 {
 337         struct thermostat* th = arg;
 338
 339         set_freezable();
 340         while(!kthread_should_stop()) {
 341                 try_to_freeze();
 342                 msleep_interruptible(2000);
 343
 344 #ifndef DEBUG
 345                 if (fan_speed != -1)
 346                         read_sensors(th);
 347 #else
 348                 read_sensors(th);
 349 #endif
 350
 351                 if (fan_speed != -1)
 352                         update_fans_speed(th);
 353
 354 #ifdef DEBUG
 355                 display_stats(th);
 356 #endif
 357
 358         }
 359
 360         return 0;
 361 }
 362
 363 static void set_limit(struct thermostat *th, int i)
 364 {
 365                 /* Set sensor1 limit higher to avoid powerdowns */
 366                 th->limits[i] = default_limits_chip[i] + limit_adjust;
 367                 write_reg(th, LIMIT_REG[i], th->limits[i]);
 368
 369                 /* set our limits to normal */
 370                 th->limits[i] = default_limits_local[i] + limit_adjust;
 371 }
 372
 373 static int probe_thermostat(struct i2c_client *client,
 374                             const struct i2c_device_id *id)
 375 {
 376         struct thermostat* th;
 377         int rc;
 378         int i;
 379
 380         if (thermostat)
 381                 return 0;
 382
 383         th = kzalloc(sizeof(struct thermostat), GFP_KERNEL);
 384         if (!th)
 385                 return -ENOMEM;
 386
 387         i2c_set_clientdata(client, th);
 388         th->clt = client;
 389
 390         rc = read_reg(th, 0);
 391         if (rc < 0) {
 392                 dev_err(&client->dev, "Thermostat failed to read config!\n");
 393                 kfree(th);
 394                 return -ENODEV;
 395         }
 396
 397         /* force manual control to start the fan quieter */
 398         if (fan_speed == -1)
 399                 fan_speed = 64;
 400
 401         if(therm_type == ADT7460) {
 402                 printk(KERN_INFO "adt746x: ADT7460 initializing\n");
 403                 /* The 7460 needs to be started explicitly */
 404                 write_reg(th, CONFIG_REG, 1);
 405         } else
 406                 printk(KERN_INFO "adt746x: ADT7467 initializing\n");
 407
 408         for (i = 0; i < 3; i++) {
 409                 th->initial_limits[i] = read_reg(th, LIMIT_REG[i]);
 410                 set_limit(th, i);
 411         }
 412
 413         printk(KERN_INFO "adt746x: Lowering max temperatures from %d, %d, %d"
 414                          " to %d, %d, %d\n",
 415                          th->initial_limits[0], th->initial_limits[1],
 416                          th->initial_limits[2], th->limits[0], th->limits[1],
 417                          th->limits[2]);
 418
 419         thermostat = th;
 420
 421         /* be sure to really write fan speed the first time */
 422         th->last_speed[0] = -2;
 423         th->last_speed[1] = -2;
 424         th->last_var[0] = -80;
 425         th->last_var[1] = -80;
 426
 427         if (fan_speed != -1) {
 428                 /* manual mode, stop fans */
 429                 write_both_fan_speed(th, 0);
 430         } else {
 431                 /* automatic mode */
 432                 write_both_fan_speed(th, -1);
 433         }
 434
 435         thread_therm = kthread_run(monitor_task, th, "kfand");
 436
 437         if (thread_therm == ERR_PTR(-ENOMEM)) {
 438                 printk(KERN_INFO "adt746x: Kthread creation failed\n");
 439                 thread_therm = NULL;
 440                 return -ENOMEM;
 441         }
 442
 443         return 0;
 444 }
 445
 446 static const struct i2c_device_id therm_adt746x_id[] = {
 447         { "therm_adt746x", 0 },
 448         { }
 449 };
 450
 451 static struct i2c_driver thermostat_driver = {
 452         .driver = {
 453                 .name   = "therm_adt746x",
 454         },
 455         .attach_adapter = attach_thermostat,
 456         .probe = probe_thermostat,
 457         .remove = remove_thermostat,
 458         .id_table = therm_adt746x_id,
 459 };
 460
 461 /*
 462  * Now, unfortunately, sysfs doesn't give us a nice void * we could
 463  * pass around to the attribute functions, so we don't really have
 464  * choice but implement a bunch of them...
 465  *
 466  * FIXME, it does now...
 467  */
 468 #define BUILD_SHOW_FUNC_INT(name, data)                         \
 469 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)        \
 470 {                                                               \
 471         return sprintf(buf, "%d\n", data);                      \
 472 }
 473
 474 #define BUILD_SHOW_FUNC_STR(name, data)                         \
 475 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)       \
 476 {                                                               \
 477         return sprintf(buf, "%s\n", data);                      \
 478 }
 479
 480 #define BUILD_SHOW_FUNC_FAN(name, data)                         \
 481 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)       \
 482 {                                                               \
 483         return sprintf(buf, "%d (%d rpm)\n",                    \
 484                 thermostat->last_speed[data],                   \
 485                 read_fan_speed(thermostat, FAN_SPEED[data])     \
 486                 );                                              \
 487 }
 488
 489 #define BUILD_STORE_FUNC_DEG(name, data)                        \
 490 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
 491 {                                                               \
 492         int val;                                                \
 493         int i;                                                  \
 494         val = simple_strtol(buf, NULL, 10);                     \
 495         printk(KERN_INFO "Adjusting limits by %d degrees\n", val);      \
 496         limit_adjust = val;                                     \
 497         for (i=0; i < 3; i++)                                   \
 498                 set_limit(thermostat, i);                       \
 499         return n;                                               \
 500 }
 501
 502 #define BUILD_STORE_FUNC_INT(name, data)                        \
 503 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
 504 {                                                               \
 505         int val;                                                \
 506         val = simple_strtol(buf, NULL, 10);                     \
 507         if (val < 0 || val > 255)                               \
 508                 return -EINVAL;                                 \
 509         printk(KERN_INFO "Setting specified fan speed to %d\n", val);   \
 510         data = val;                                             \
 511         return n;                                               \
 512 }
 513
 514 BUILD_SHOW_FUNC_INT(sensor1_temperature,         (read_reg(thermostat, TEMP_REG[1])))
 515 BUILD_SHOW_FUNC_INT(sensor2_temperature,         (read_reg(thermostat, TEMP_REG[2])))
 516 BUILD_SHOW_FUNC_INT(sensor1_limit,               thermostat->limits[1])
 517 BUILD_SHOW_FUNC_INT(sensor2_limit,               thermostat->limits[2])
 518 BUILD_SHOW_FUNC_STR(sensor1_location,            sensor_location[1])
 519 BUILD_SHOW_FUNC_STR(sensor2_location,            sensor_location[2])
 520
 521 BUILD_SHOW_FUNC_INT(specified_fan_speed, fan_speed)
 522 BUILD_SHOW_FUNC_FAN(sensor1_fan_speed,   0)
 523 BUILD_SHOW_FUNC_FAN(sensor2_fan_speed,   1)
 524
 525 BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed)
 526 BUILD_SHOW_FUNC_INT(limit_adjust,        limit_adjust)
 527 BUILD_STORE_FUNC_DEG(limit_adjust,       thermostat)
 528
 529 static DEVICE_ATTR(sensor1_temperature, S_IRUGO,
 530                    show_sensor1_temperature,NULL);
 531 static DEVICE_ATTR(sensor2_temperature, S_IRUGO,
 532                    show_sensor2_temperature,NULL);
 533 static DEVICE_ATTR(sensor1_limit, S_IRUGO,
 534                    show_sensor1_limit,  NULL);
 535 static DEVICE_ATTR(sensor2_limit, S_IRUGO,
 536                    show_sensor2_limit,  NULL);
 537 static DEVICE_ATTR(sensor1_location, S_IRUGO,
 538                    show_sensor1_location, NULL);
 539 static DEVICE_ATTR(sensor2_location, S_IRUGO,
 540                    show_sensor2_location, NULL);
 541
 542 static DEVICE_ATTR(specified_fan_speed, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 543                    show_specified_fan_speed,store_specified_fan_speed);
 544
 545 static DEVICE_ATTR(sensor1_fan_speed,   S_IRUGO,
 546                    show_sensor1_fan_speed,      NULL);
 547 static DEVICE_ATTR(sensor2_fan_speed,   S_IRUGO,
 548                    show_sensor2_fan_speed,      NULL);
 549
 550 static DEVICE_ATTR(limit_adjust,        S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 551                    show_limit_adjust,   store_limit_adjust);
 552
 553
 554 static int __init
 555 thermostat_init(void)
 556 {
 557         struct device_node* np;
 558         const u32 *prop;
 559         int i = 0, offset = 0;
 560         int err;
 561
 562         np = of_find_node_by_name(NULL, "fan");
 563         if (!np)
 564                 return -ENODEV;
 565         if (of_device_is_compatible(np, "adt7460"))
 566                 therm_type = ADT7460;
 567         else if (of_device_is_compatible(np, "adt7467"))
 568                 therm_type = ADT7467;
 569         else {
 570                 of_node_put(np);
 571                 return -ENODEV;
 572         }
 573
 574         prop = of_get_property(np, "hwsensor-params-version", NULL);
 575         printk(KERN_INFO "adt746x: version %d (%ssupported)\n", *prop,
 576                          (*prop == 1)?"":"un");
 577         if (*prop != 1) {
 578                 of_node_put(np);
 579                 return -ENODEV;
 580         }
 581
 582         prop = of_get_property(np, "reg", NULL);
 583         if (!prop) {
 584                 of_node_put(np);
 585                 return -ENODEV;
 586         }
 587
 588         /* look for bus either by path or using "reg" */
 589         if (strstr(np->full_name, "/i2c-bus@") != NULL) {
 590                 const char *tmp_bus = (strstr(np->full_name, "/i2c-bus@") + 9);
 591                 therm_bus = tmp_bus[0]-'0';
 592         } else {
 593                 therm_bus = ((*prop) >> 8) & 0x0f;
 594         }
 595
 596         therm_address = ((*prop) & 0xff) >> 1;
 597
 598         printk(KERN_INFO "adt746x: Thermostat bus: %d, address: 0x%02x, "
 599                          "limit_adjust: %d, fan_speed: %d\n",
 600                          therm_bus, therm_address, limit_adjust, fan_speed);
 601
 602         if (of_get_property(np, "hwsensor-location", NULL)) {
 603                 for (i = 0; i < 3; i++) {
 604                         sensor_location[i] = of_get_property(np,
 605                                         "hwsensor-location", NULL) + offset;
 606
 607                         if (sensor_location[i] == NULL)
 608                                 sensor_location[i] = "";
 609
 610                         printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]);
 611                         offset += strlen(sensor_location[i]) + 1;
 612                 }
 613         } else {
 614                 sensor_location[0] = "?";
 615                 sensor_location[1] = "?";
 616                 sensor_location[2] = "?";
 617         }
 618
 619         of_dev = of_platform_device_create(np, "temperatures", NULL);
 620         of_node_put(np);
 621
 622         if (of_dev == NULL) {
 623                 printk(KERN_ERR "Can't register temperatures device !\n");
 624                 return -ENODEV;
 625         }
 626
 627         err = device_create_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 628         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 629         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_limit);
 630         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_limit);
 631         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_location);
 632         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_location);
 633         err |= device_create_file(&of_dev->dev, &dev_attr_limit_adjust);
 634         err |= device_create_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 635         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 636         if(therm_type == ADT7460)
 637                 err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_fan_speed);
 638         if (err)
 639                 printk(KERN_WARNING
 640                         "Failed to create tempertaure attribute file(s).\n");
 641
 642 #ifndef CONFIG_I2C_POWERMAC
 643         request_module("i2c-powermac");
 644 #endif
 645
 646         return i2c_add_driver(&thermostat_driver);
 647 }
 648
 649 static void __exit
 650 thermostat_exit(void)
 651 {
 652         if (of_dev) {
 653                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 654                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 655                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_limit);
 656                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_limit);
 657                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_location);
 658                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_location);
 659                 device_remove_file(&of_dev->dev, &dev_attr_limit_adjust);
 660                 device_remove_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 661                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 662
 663                 if(therm_type == ADT7460)
 664                         device_remove_file(&of_dev->dev,
 665                                            &dev_attr_sensor2_fan_speed);
 666
 667                 of_device_unregister(of_dev);
 668         }
 669         i2c_del_driver(&thermostat_driver);
 670 }
 671
 672 module_init(thermostat_init);
 673 module_exit(thermostat_exit);