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
  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 void write_both_fan_speed(struct thermostat *th, int speed);
  90 static void write_fan_speed(struct thermostat *th, int speed, int fan);
  91
  92 static int
  93 write_reg(struct thermostat* th, int reg, u8 data)
  94 {
  95         u8 tmp[2];
  96         int rc;
  97
  98         tmp[0] = reg;
  99         tmp[1] = data;
 100         rc = i2c_master_send(th->clt, (const char *)tmp, 2);
 101         if (rc < 0)
 102                 return rc;
 103         if (rc != 2)
 104                 return -ENODEV;
 105         return 0;
 106 }
 107
 108 static int
 109 read_reg(struct thermostat* th, int reg)
 110 {
 111         u8 reg_addr, data;
 112         int rc;
 113
 114         reg_addr = (u8)reg;
 115         rc = i2c_master_send(th->clt, &reg_addr, 1);
 116         if (rc < 0)
 117                 return rc;
 118         if (rc != 1)
 119                 return -ENODEV;
 120         rc = i2c_master_recv(th->clt, (char *)&data, 1);
 121         if (rc < 0)
 122                 return rc;
 123         return data;
 124 }
 125
 126 static int
 127 attach_thermostat(struct i2c_adapter *adapter)
 128 {
 129         unsigned long bus_no;
 130         struct i2c_board_info info;
 131         struct i2c_client *client;
 132
 133         if (strncmp(adapter->name, "uni-n", 5))
 134                 return -ENODEV;
 135         bus_no = simple_strtoul(adapter->name + 6, NULL, 10);
 136         if (bus_no != therm_bus)
 137                 return -ENODEV;
 138
 139         memset(&info, 0, sizeof(struct i2c_board_info));
 140         strlcpy(info.type, "therm_adt746x", I2C_NAME_SIZE);
 141         info.addr = therm_address;
 142         client = i2c_new_device(adapter, &info);
 143         if (!client)
 144                 return -ENODEV;
 145
 146         /*
 147          * Let i2c-core delete that device on driver removal.
 148          * This is safe because i2c-core holds the core_lock mutex for us.
 149          */
 150         list_add_tail(&client->detected, &client->driver->clients);
 151         return 0;
 152 }
 153
 154 static int
 155 remove_thermostat(struct i2c_client *client)
 156 {
 157         struct thermostat *th = i2c_get_clientdata(client);
 158         int i;
 159
 160         if (thread_therm != NULL) {
 161                 kthread_stop(thread_therm);
 162         }
 163
 164         printk(KERN_INFO "adt746x: Putting max temperatures back from "
 165                          "%d, %d, %d to %d, %d, %d\n",
 166                 th->limits[0], th->limits[1], th->limits[2],
 167                 th->initial_limits[0], th->initial_limits[1],
 168                 th->initial_limits[2]);
 169
 170         for (i = 0; i < 3; i++)
 171                 write_reg(th, LIMIT_REG[i], th->initial_limits[i]);
 172
 173         write_both_fan_speed(th, -1);
 174
 175         thermostat = NULL;
 176
 177         kfree(th);
 178
 179         return 0;
 180 }
 181
 182 static int read_fan_speed(struct thermostat *th, u8 addr)
 183 {
 184         u8 tmp[2];
 185         u16 res;
 186
 187         /* should start with low byte */
 188         tmp[1] = read_reg(th, addr);
 189         tmp[0] = read_reg(th, addr + 1);
 190
 191         res = tmp[1] + (tmp[0] << 8);
 192         /* "a value of 0xffff means that the fan has stopped" */
 193         return (res == 0xffff ? 0 : (90000*60)/res);
 194 }
 195
 196 static void write_both_fan_speed(struct thermostat *th, int speed)
 197 {
 198         write_fan_speed(th, speed, 0);
 199         if (therm_type == ADT7460)
 200                 write_fan_speed(th, speed, 1);
 201 }
 202
 203 static void write_fan_speed(struct thermostat *th, int speed, int fan)
 204 {
 205         u8 manual;
 206
 207         if (speed > 0xff)
 208                 speed = 0xff;
 209         else if (speed < -1)
 210                 speed = 0;
 211
 212         if (therm_type == ADT7467 && fan == 1)
 213                 return;
 214
 215         if (th->last_speed[fan] != speed) {
 216                 if (verbose) {
 217                         if (speed == -1)
 218                                 printk(KERN_DEBUG "adt746x: Setting speed to automatic "
 219                                         "for %s fan.\n", sensor_location[fan+1]);
 220                         else
 221                                 printk(KERN_DEBUG "adt746x: Setting speed to %d "
 222                                         "for %s fan.\n", speed, sensor_location[fan+1]);
 223                 }
 224         } else
 225                 return;
 226
 227         if (speed >= 0) {
 228                 manual = read_reg(th, MANUAL_MODE[fan]);
 229                 write_reg(th, MANUAL_MODE[fan], manual|MANUAL_MASK);
 230                 write_reg(th, FAN_SPD_SET[fan], speed);
 231         } else {
 232                 /* back to automatic */
 233                 if(therm_type == ADT7460) {
 234                         manual = read_reg(th,
 235                                 MANUAL_MODE[fan]) & (~MANUAL_MASK);
 236
 237                         write_reg(th,
 238                                 MANUAL_MODE[fan], manual|REM_CONTROL[fan]);
 239                 } else {
 240                         manual = read_reg(th, MANUAL_MODE[fan]);
 241                         write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK));
 242                 }
 243         }
 244
 245         th->last_speed[fan] = speed;
 246 }
 247
 248 static void read_sensors(struct thermostat *th)
 249 {
 250         int i = 0;
 251
 252         for (i = 0; i < 3; i++)
 253                 th->temps[i]  = read_reg(th, TEMP_REG[i]);
 254 }
 255
 256 #ifdef DEBUG
 257 static void display_stats(struct thermostat *th)
 258 {
 259         if (th->temps[0] != th->cached_temp[0]
 260         ||  th->temps[1] != th->cached_temp[1]
 261         ||  th->temps[2] != th->cached_temp[2]) {
 262                 printk(KERN_INFO "adt746x: Temperature infos:"
 263                                  " thermostats: %d,%d,%d;"
 264                                  " limits: %d,%d,%d;"
 265                                  " fan speed: %d RPM\n",
 266                                  th->temps[0], th->temps[1], th->temps[2],
 267                                  th->limits[0],  th->limits[1],  th->limits[2],
 268                                  read_fan_speed(th, FAN_SPEED[0]));
 269         }
 270         th->cached_temp[0] = th->temps[0];
 271         th->cached_temp[1] = th->temps[1];
 272         th->cached_temp[2] = th->temps[2];
 273 }
 274 #endif
 275
 276 static void update_fans_speed (struct thermostat *th)
 277 {
 278         int lastvar = 0; /* last variation, for iBook */
 279         int i = 0;
 280
 281         /* we don't care about local sensor, so we start at sensor 1 */
 282         for (i = 1; i < 3; i++) {
 283                 int started = 0;
 284                 int fan_number = (therm_type == ADT7460 && i == 2);
 285                 int var = th->temps[i] - th->limits[i];
 286
 287                 if (var > -1) {
 288                         int step = (255 - fan_speed) / 7;
 289                         int new_speed = 0;
 290
 291                         /* hysteresis : change fan speed only if variation is
 292                          * more than two degrees */
 293                         if (abs(var - th->last_var[fan_number]) < 2)
 294                                 continue;
 295
 296                         started = 1;
 297                         new_speed = fan_speed + ((var-1)*step);
 298
 299                         if (new_speed < fan_speed)
 300                                 new_speed = fan_speed;
 301                         if (new_speed > 255)
 302                                 new_speed = 255;
 303
 304                         if (verbose)
 305                                 printk(KERN_DEBUG "adt746x: Setting fans speed to %d "
 306                                                  "(limit exceeded by %d on %s) \n",
 307                                                 new_speed, var,
 308                                                 sensor_location[fan_number+1]);
 309                         write_both_fan_speed(th, new_speed);
 310                         th->last_var[fan_number] = var;
 311                 } else if (var < -2) {
 312                         /* don't stop fan if sensor2 is cold and sensor1 is not
 313                          * so cold (lastvar >= -1) */
 314                         if (i == 2 && lastvar < -1) {
 315                                 if (th->last_speed[fan_number] != 0)
 316                                         if (verbose)
 317                                                 printk(KERN_DEBUG "adt746x: Stopping "
 318                                                         "fans.\n");
 319                                 write_both_fan_speed(th, 0);
 320                         }
 321                 }
 322
 323                 lastvar = var;
 324
 325                 if (started)
 326                         return; /* we don't want to re-stop the fan
 327                                 * if sensor1 is heating and sensor2 is not */
 328         }
 329 }
 330
 331 static int monitor_task(void *arg)
 332 {
 333         struct thermostat* th = arg;
 334
 335         set_freezable();
 336         while(!kthread_should_stop()) {
 337                 try_to_freeze();
 338                 msleep_interruptible(2000);
 339
 340 #ifndef DEBUG
 341                 if (fan_speed != -1)
 342                         read_sensors(th);
 343 #else
 344                 read_sensors(th);
 345 #endif
 346
 347                 if (fan_speed != -1)
 348                         update_fans_speed(th);
 349
 350 #ifdef DEBUG
 351                 display_stats(th);
 352 #endif
 353
 354         }
 355
 356         return 0;
 357 }
 358
 359 static void set_limit(struct thermostat *th, int i)
 360 {
 361                 /* Set sensor1 limit higher to avoid powerdowns */
 362                 th->limits[i] = default_limits_chip[i] + limit_adjust;
 363                 write_reg(th, LIMIT_REG[i], th->limits[i]);
 364
 365                 /* set our limits to normal */
 366                 th->limits[i] = default_limits_local[i] + limit_adjust;
 367 }
 368
 369 static int probe_thermostat(struct i2c_client *client,
 370                             const struct i2c_device_id *id)
 371 {
 372         struct thermostat* th;
 373         int rc;
 374         int i;
 375
 376         if (thermostat)
 377                 return 0;
 378
 379         th = kzalloc(sizeof(struct thermostat), GFP_KERNEL);
 380         if (!th)
 381                 return -ENOMEM;
 382
 383         i2c_set_clientdata(client, th);
 384         th->clt = client;
 385
 386         rc = read_reg(th, 0);
 387         if (rc < 0) {
 388                 dev_err(&client->dev, "Thermostat failed to read config!\n");
 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         /* be sure to really write fan speed the first time */
 418         th->last_speed[0] = -2;
 419         th->last_speed[1] = -2;
 420         th->last_var[0] = -80;
 421         th->last_var[1] = -80;
 422
 423         if (fan_speed != -1) {
 424                 /* manual mode, stop fans */
 425                 write_both_fan_speed(th, 0);
 426         } else {
 427                 /* automatic mode */
 428                 write_both_fan_speed(th, -1);
 429         }
 430
 431         thread_therm = kthread_run(monitor_task, th, "kfand");
 432
 433         if (thread_therm == ERR_PTR(-ENOMEM)) {
 434                 printk(KERN_INFO "adt746x: Kthread creation failed\n");
 435                 thread_therm = NULL;
 436                 return -ENOMEM;
 437         }
 438
 439         return 0;
 440 }
 441
 442 static const struct i2c_device_id therm_adt746x_id[] = {
 443         { "therm_adt746x", 0 },
 444         { }
 445 };
 446
 447 static struct i2c_driver thermostat_driver = {
 448         .driver = {
 449                 .name   = "therm_adt746x",
 450         },
 451         .attach_adapter = attach_thermostat,
 452         .probe = probe_thermostat,
 453         .remove = remove_thermostat,
 454         .id_table = therm_adt746x_id,
 455 };
 456
 457 /*
 458  * Now, unfortunately, sysfs doesn't give us a nice void * we could
 459  * pass around to the attribute functions, so we don't really have
 460  * choice but implement a bunch of them...
 461  *
 462  * FIXME, it does now...
 463  */
 464 #define BUILD_SHOW_FUNC_INT(name, data)                         \
 465 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)        \
 466 {                                                               \
 467         return sprintf(buf, "%d\n", data);                      \
 468 }
 469
 470 #define BUILD_SHOW_FUNC_STR(name, data)                         \
 471 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)       \
 472 {                                                               \
 473         return sprintf(buf, "%s\n", data);                      \
 474 }
 475
 476 #define BUILD_SHOW_FUNC_FAN(name, data)                         \
 477 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)       \
 478 {                                                               \
 479         return sprintf(buf, "%d (%d rpm)\n",                    \
 480                 thermostat->last_speed[data],                   \
 481                 read_fan_speed(thermostat, FAN_SPEED[data])     \
 482                 );                                              \
 483 }
 484
 485 #define BUILD_STORE_FUNC_DEG(name, data)                        \
 486 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
 487 {                                                               \
 488         int val;                                                \
 489         int i;                                                  \
 490         val = simple_strtol(buf, NULL, 10);                     \
 491         printk(KERN_INFO "Adjusting limits by %d degrees\n", val);      \
 492         limit_adjust = val;                                     \
 493         for (i=0; i < 3; i++)                                   \
 494                 set_limit(thermostat, i);                       \
 495         return n;                                               \
 496 }
 497
 498 #define BUILD_STORE_FUNC_INT(name, data)                        \
 499 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
 500 {                                                               \
 501         int val;                                                \
 502         val = simple_strtol(buf, NULL, 10);                     \
 503         if (val < 0 || val > 255)                               \
 504                 return -EINVAL;                                 \
 505         printk(KERN_INFO "Setting specified fan speed to %d\n", val);   \
 506         data = val;                                             \
 507         return n;                                               \
 508 }
 509
 510 BUILD_SHOW_FUNC_INT(sensor1_temperature,         (read_reg(thermostat, TEMP_REG[1])))
 511 BUILD_SHOW_FUNC_INT(sensor2_temperature,         (read_reg(thermostat, TEMP_REG[2])))
 512 BUILD_SHOW_FUNC_INT(sensor1_limit,               thermostat->limits[1])
 513 BUILD_SHOW_FUNC_INT(sensor2_limit,               thermostat->limits[2])
 514 BUILD_SHOW_FUNC_STR(sensor1_location,            sensor_location[1])
 515 BUILD_SHOW_FUNC_STR(sensor2_location,            sensor_location[2])
 516
 517 BUILD_SHOW_FUNC_INT(specified_fan_speed, fan_speed)
 518 BUILD_SHOW_FUNC_FAN(sensor1_fan_speed,   0)
 519 BUILD_SHOW_FUNC_FAN(sensor2_fan_speed,   1)
 520
 521 BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed)
 522 BUILD_SHOW_FUNC_INT(limit_adjust,        limit_adjust)
 523 BUILD_STORE_FUNC_DEG(limit_adjust,       thermostat)
 524
 525 static DEVICE_ATTR(sensor1_temperature, S_IRUGO,
 526                    show_sensor1_temperature,NULL);
 527 static DEVICE_ATTR(sensor2_temperature, S_IRUGO,
 528                    show_sensor2_temperature,NULL);
 529 static DEVICE_ATTR(sensor1_limit, S_IRUGO,
 530                    show_sensor1_limit,  NULL);
 531 static DEVICE_ATTR(sensor2_limit, S_IRUGO,
 532                    show_sensor2_limit,  NULL);
 533 static DEVICE_ATTR(sensor1_location, S_IRUGO,
 534                    show_sensor1_location, NULL);
 535 static DEVICE_ATTR(sensor2_location, S_IRUGO,
 536                    show_sensor2_location, NULL);
 537
 538 static DEVICE_ATTR(specified_fan_speed, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 539                    show_specified_fan_speed,store_specified_fan_speed);
 540
 541 static DEVICE_ATTR(sensor1_fan_speed,   S_IRUGO,
 542                    show_sensor1_fan_speed,      NULL);
 543 static DEVICE_ATTR(sensor2_fan_speed,   S_IRUGO,
 544                    show_sensor2_fan_speed,      NULL);
 545
 546 static DEVICE_ATTR(limit_adjust,        S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 547                    show_limit_adjust,   store_limit_adjust);
 548
 549
 550 static int __init
 551 thermostat_init(void)
 552 {
 553         struct device_node* np;
 554         const u32 *prop;
 555         int i = 0, offset = 0;
 556         int err;
 557
 558         np = of_find_node_by_name(NULL, "fan");
 559         if (!np)
 560                 return -ENODEV;
 561         if (of_device_is_compatible(np, "adt7460"))
 562                 therm_type = ADT7460;
 563         else if (of_device_is_compatible(np, "adt7467"))
 564                 therm_type = ADT7467;
 565         else {
 566                 of_node_put(np);
 567                 return -ENODEV;
 568         }
 569
 570         prop = of_get_property(np, "hwsensor-params-version", NULL);
 571         printk(KERN_INFO "adt746x: version %d (%ssupported)\n", *prop,
 572                          (*prop == 1)?"":"un");
 573         if (*prop != 1) {
 574                 of_node_put(np);
 575                 return -ENODEV;
 576         }
 577
 578         prop = of_get_property(np, "reg", NULL);
 579         if (!prop) {
 580                 of_node_put(np);
 581                 return -ENODEV;
 582         }
 583
 584         /* look for bus either by path or using "reg" */
 585         if (strstr(np->full_name, "/i2c-bus@") != NULL) {
 586                 const char *tmp_bus = (strstr(np->full_name, "/i2c-bus@") + 9);
 587                 therm_bus = tmp_bus[0]-'0';
 588         } else {
 589                 therm_bus = ((*prop) >> 8) & 0x0f;
 590         }
 591
 592         therm_address = ((*prop) & 0xff) >> 1;
 593
 594         printk(KERN_INFO "adt746x: Thermostat bus: %d, address: 0x%02x, "
 595                          "limit_adjust: %d, fan_speed: %d\n",
 596                          therm_bus, therm_address, limit_adjust, fan_speed);
 597
 598         if (of_get_property(np, "hwsensor-location", NULL)) {
 599                 for (i = 0; i < 3; i++) {
 600                         sensor_location[i] = of_get_property(np,
 601                                         "hwsensor-location", NULL) + offset;
 602
 603                         if (sensor_location[i] == NULL)
 604                                 sensor_location[i] = "";
 605
 606                         printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]);
 607                         offset += strlen(sensor_location[i]) + 1;
 608                 }
 609         } else {
 610                 sensor_location[0] = "?";
 611                 sensor_location[1] = "?";
 612                 sensor_location[2] = "?";
 613         }
 614
 615         of_dev = of_platform_device_create(np, "temperatures", NULL);
 616         of_node_put(np);
 617
 618         if (of_dev == NULL) {
 619                 printk(KERN_ERR "Can't register temperatures device !\n");
 620                 return -ENODEV;
 621         }
 622
 623         err = device_create_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 624         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 625         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_limit);
 626         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_limit);
 627         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_location);
 628         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_location);
 629         err |= device_create_file(&of_dev->dev, &dev_attr_limit_adjust);
 630         err |= device_create_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 631         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 632         if(therm_type == ADT7460)
 633                 err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_fan_speed);
 634         if (err)
 635                 printk(KERN_WARNING
 636                         "Failed to create tempertaure attribute file(s).\n");
 637
 638 #ifndef CONFIG_I2C_POWERMAC
 639         request_module("i2c-powermac");
 640 #endif
 641
 642         return i2c_add_driver(&thermostat_driver);
 643 }
 644
 645 static void __exit
 646 thermostat_exit(void)
 647 {
 648         if (of_dev) {
 649                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 650                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 651                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_limit);
 652                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_limit);
 653                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_location);
 654                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_location);
 655                 device_remove_file(&of_dev->dev, &dev_attr_limit_adjust);
 656                 device_remove_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 657                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 658
 659                 if(therm_type == ADT7460)
 660                         device_remove_file(&of_dev->dev,
 661                                            &dev_attr_sensor2_fan_speed);
 662
 663                 of_device_unregister(of_dev);
 664         }
 665         i2c_del_driver(&thermostat_driver);
 666 }
 667
 668 module_init(thermostat_init);
 669 module_exit(thermostat_exit);