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   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         int                     pwm_inv[2];
  83 };
  84
  85 static enum {ADT7460, ADT7467} therm_type;
  86 static int therm_bus, therm_address;
  87 static struct of_device * of_dev;
  88 static struct thermostat* thermostat;
  89 static struct task_struct *thread_therm = NULL;
  90
  91 static void write_both_fan_speed(struct thermostat *th, int speed);
  92 static void write_fan_speed(struct thermostat *th, int speed, int fan);
  93
  94 static int
  95 write_reg(struct thermostat* th, int reg, u8 data)
  96 {
  97         u8 tmp[2];
  98         int rc;
  99
 100         tmp[0] = reg;
 101         tmp[1] = data;
 102         rc = i2c_master_send(th->clt, (const char *)tmp, 2);
 103         if (rc < 0)
 104                 return rc;
 105         if (rc != 2)
 106                 return -ENODEV;
 107         return 0;
 108 }
 109
 110 static int
 111 read_reg(struct thermostat* th, int reg)
 112 {
 113         u8 reg_addr, data;
 114         int rc;
 115
 116         reg_addr = (u8)reg;
 117         rc = i2c_master_send(th->clt, &reg_addr, 1);
 118         if (rc < 0)
 119                 return rc;
 120         if (rc != 1)
 121                 return -ENODEV;
 122         rc = i2c_master_recv(th->clt, (char *)&data, 1);
 123         if (rc < 0)
 124                 return rc;
 125         return data;
 126 }
 127
 128 static struct i2c_driver thermostat_driver;
 129
 130 static int
 131 attach_thermostat(struct i2c_adapter *adapter)
 132 {
 133         unsigned long bus_no;
 134         struct i2c_board_info info;
 135         struct i2c_client *client;
 136
 137         if (strncmp(adapter->name, "uni-n", 5))
 138                 return -ENODEV;
 139         bus_no = simple_strtoul(adapter->name + 6, NULL, 10);
 140         if (bus_no != therm_bus)
 141                 return -ENODEV;
 142
 143         memset(&info, 0, sizeof(struct i2c_board_info));
 144         strlcpy(info.type, "therm_adt746x", I2C_NAME_SIZE);
 145         info.addr = therm_address;
 146         client = i2c_new_device(adapter, &info);
 147         if (!client)
 148                 return -ENODEV;
 149
 150         /*
 151          * Let i2c-core delete that device on driver removal.
 152          * This is safe because i2c-core holds the core_lock mutex for us.
 153          */
 154         list_add_tail(&client->detected, &thermostat_driver.clients);
 155         return 0;
 156 }
 157
 158 static int
 159 remove_thermostat(struct i2c_client *client)
 160 {
 161         struct thermostat *th = i2c_get_clientdata(client);
 162         int i;
 163
 164         if (thread_therm != NULL) {
 165                 kthread_stop(thread_therm);
 166         }
 167
 168         printk(KERN_INFO "adt746x: Putting max temperatures back from "
 169                          "%d, %d, %d to %d, %d, %d\n",
 170                 th->limits[0], th->limits[1], th->limits[2],
 171                 th->initial_limits[0], th->initial_limits[1],
 172                 th->initial_limits[2]);
 173
 174         for (i = 0; i < 3; i++)
 175                 write_reg(th, LIMIT_REG[i], th->initial_limits[i]);
 176
 177         write_both_fan_speed(th, -1);
 178
 179         thermostat = NULL;
 180
 181         kfree(th);
 182
 183         return 0;
 184 }
 185
 186 static int read_fan_speed(struct thermostat *th, u8 addr)
 187 {
 188         u8 tmp[2];
 189         u16 res;
 190
 191         /* should start with low byte */
 192         tmp[1] = read_reg(th, addr);
 193         tmp[0] = read_reg(th, addr + 1);
 194
 195         res = tmp[1] + (tmp[0] << 8);
 196         /* "a value of 0xffff means that the fan has stopped" */
 197         return (res == 0xffff ? 0 : (90000*60)/res);
 198 }
 199
 200 static void write_both_fan_speed(struct thermostat *th, int speed)
 201 {
 202         write_fan_speed(th, speed, 0);
 203         if (therm_type == ADT7460)
 204                 write_fan_speed(th, speed, 1);
 205 }
 206
 207 static void write_fan_speed(struct thermostat *th, int speed, int fan)
 208 {
 209         u8 manual;
 210
 211         if (speed > 0xff)
 212                 speed = 0xff;
 213         else if (speed < -1)
 214                 speed = 0;
 215
 216         if (therm_type == ADT7467 && fan == 1)
 217                 return;
 218
 219         if (th->last_speed[fan] != speed) {
 220                 if (verbose) {
 221                         if (speed == -1)
 222                                 printk(KERN_DEBUG "adt746x: Setting speed to automatic "
 223                                         "for %s fan.\n", sensor_location[fan+1]);
 224                         else
 225                                 printk(KERN_DEBUG "adt746x: Setting speed to %d "
 226                                         "for %s fan.\n", speed, sensor_location[fan+1]);
 227                 }
 228         } else
 229                 return;
 230
 231         if (speed >= 0) {
 232                 manual = read_reg(th, MANUAL_MODE[fan]);
 233                 manual &= ~INVERT_MASK;
 234                 write_reg(th, MANUAL_MODE[fan],
 235                         manual | MANUAL_MASK | th->pwm_inv[fan]);
 236                 write_reg(th, FAN_SPD_SET[fan], speed);
 237         } else {
 238                 /* back to automatic */
 239                 if(therm_type == ADT7460) {
 240                         manual = read_reg(th,
 241                                 MANUAL_MODE[fan]) & (~MANUAL_MASK);
 242                         manual &= ~INVERT_MASK;
 243                         manual |= th->pwm_inv[fan];
 244                         write_reg(th,
 245                                 MANUAL_MODE[fan], manual|REM_CONTROL[fan]);
 246                 } else {
 247                         manual = read_reg(th, MANUAL_MODE[fan]);
 248                         manual &= ~INVERT_MASK;
 249                         manual |= th->pwm_inv[fan];
 250                         write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK));
 251                 }
 252         }
 253
 254         th->last_speed[fan] = speed;
 255 }
 256
 257 static void read_sensors(struct thermostat *th)
 258 {
 259         int i = 0;
 260
 261         for (i = 0; i < 3; i++)
 262                 th->temps[i]  = read_reg(th, TEMP_REG[i]);
 263 }
 264
 265 #ifdef DEBUG
 266 static void display_stats(struct thermostat *th)
 267 {
 268         if (th->temps[0] != th->cached_temp[0]
 269         ||  th->temps[1] != th->cached_temp[1]
 270         ||  th->temps[2] != th->cached_temp[2]) {
 271                 printk(KERN_INFO "adt746x: Temperature infos:"
 272                                  " thermostats: %d,%d,%d;"
 273                                  " limits: %d,%d,%d;"
 274                                  " fan speed: %d RPM\n",
 275                                  th->temps[0], th->temps[1], th->temps[2],
 276                                  th->limits[0],  th->limits[1],  th->limits[2],
 277                                  read_fan_speed(th, FAN_SPEED[0]));
 278         }
 279         th->cached_temp[0] = th->temps[0];
 280         th->cached_temp[1] = th->temps[1];
 281         th->cached_temp[2] = th->temps[2];
 282 }
 283 #endif
 284
 285 static void update_fans_speed (struct thermostat *th)
 286 {
 287         int lastvar = 0; /* last variation, for iBook */
 288         int i = 0;
 289
 290         /* we don't care about local sensor, so we start at sensor 1 */
 291         for (i = 1; i < 3; i++) {
 292                 int started = 0;
 293                 int fan_number = (therm_type == ADT7460 && i == 2);
 294                 int var = th->temps[i] - th->limits[i];
 295
 296                 if (var > -1) {
 297                         int step = (255 - fan_speed) / 7;
 298                         int new_speed = 0;
 299
 300                         /* hysteresis : change fan speed only if variation is
 301                          * more than two degrees */
 302                         if (abs(var - th->last_var[fan_number]) < 2)
 303                                 continue;
 304
 305                         started = 1;
 306                         new_speed = fan_speed + ((var-1)*step);
 307
 308                         if (new_speed < fan_speed)
 309                                 new_speed = fan_speed;
 310                         if (new_speed > 255)
 311                                 new_speed = 255;
 312
 313                         if (verbose)
 314                                 printk(KERN_DEBUG "adt746x: Setting fans speed to %d "
 315                                                  "(limit exceeded by %d on %s) \n",
 316                                                 new_speed, var,
 317                                                 sensor_location[fan_number+1]);
 318                         write_both_fan_speed(th, new_speed);
 319                         th->last_var[fan_number] = var;
 320                 } else if (var < -2) {
 321                         /* don't stop fan if sensor2 is cold and sensor1 is not
 322                          * so cold (lastvar >= -1) */
 323                         if (i == 2 && lastvar < -1) {
 324                                 if (th->last_speed[fan_number] != 0)
 325                                         if (verbose)
 326                                                 printk(KERN_DEBUG "adt746x: Stopping "
 327                                                         "fans.\n");
 328                                 write_both_fan_speed(th, 0);
 329                         }
 330                 }
 331
 332                 lastvar = var;
 333
 334                 if (started)
 335                         return; /* we don't want to re-stop the fan
 336                                 * if sensor1 is heating and sensor2 is not */
 337         }
 338 }
 339
 340 static int monitor_task(void *arg)
 341 {
 342         struct thermostat* th = arg;
 343
 344         set_freezable();
 345         while(!kthread_should_stop()) {
 346                 try_to_freeze();
 347                 msleep_interruptible(2000);
 348
 349 #ifndef DEBUG
 350                 if (fan_speed != -1)
 351                         read_sensors(th);
 352 #else
 353                 read_sensors(th);
 354 #endif
 355
 356                 if (fan_speed != -1)
 357                         update_fans_speed(th);
 358
 359 #ifdef DEBUG
 360                 display_stats(th);
 361 #endif
 362
 363         }
 364
 365         return 0;
 366 }
 367
 368 static void set_limit(struct thermostat *th, int i)
 369 {
 370                 /* Set sensor1 limit higher to avoid powerdowns */
 371                 th->limits[i] = default_limits_chip[i] + limit_adjust;
 372                 write_reg(th, LIMIT_REG[i], th->limits[i]);
 373
 374                 /* set our limits to normal */
 375                 th->limits[i] = default_limits_local[i] + limit_adjust;
 376 }
 377
 378 static int probe_thermostat(struct i2c_client *client,
 379                             const struct i2c_device_id *id)
 380 {
 381         struct thermostat* th;
 382         int rc;
 383         int i;
 384
 385         if (thermostat)
 386                 return 0;
 387
 388         th = kzalloc(sizeof(struct thermostat), GFP_KERNEL);
 389         if (!th)
 390                 return -ENOMEM;
 391
 392         i2c_set_clientdata(client, th);
 393         th->clt = client;
 394
 395         rc = read_reg(th, CONFIG_REG);
 396         if (rc < 0) {
 397                 dev_err(&client->dev, "Thermostat failed to read config!\n");
 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         /* record invert bit status because fw can corrupt it after suspend */
 427         th->pwm_inv[0] = read_reg(th, MANUAL_MODE[0]) & INVERT_MASK;
 428         th->pwm_inv[1] = read_reg(th, MANUAL_MODE[1]) & INVERT_MASK;
 429
 430         /* be sure to really write fan speed the first time */
 431         th->last_speed[0] = -2;
 432         th->last_speed[1] = -2;
 433         th->last_var[0] = -80;
 434         th->last_var[1] = -80;
 435
 436         if (fan_speed != -1) {
 437                 /* manual mode, stop fans */
 438                 write_both_fan_speed(th, 0);
 439         } else {
 440                 /* automatic mode */
 441                 write_both_fan_speed(th, -1);
 442         }
 443
 444         thread_therm = kthread_run(monitor_task, th, "kfand");
 445
 446         if (thread_therm == ERR_PTR(-ENOMEM)) {
 447                 printk(KERN_INFO "adt746x: Kthread creation failed\n");
 448                 thread_therm = NULL;
 449                 return -ENOMEM;
 450         }
 451
 452         return 0;
 453 }
 454
 455 static const struct i2c_device_id therm_adt746x_id[] = {
 456         { "therm_adt746x", 0 },
 457         { }
 458 };
 459
 460 static struct i2c_driver thermostat_driver = {
 461         .driver = {
 462                 .name   = "therm_adt746x",
 463         },
 464         .attach_adapter = attach_thermostat,
 465         .probe = probe_thermostat,
 466         .remove = remove_thermostat,
 467         .id_table = therm_adt746x_id,
 468 };
 469
 470 /*
 471  * Now, unfortunately, sysfs doesn't give us a nice void * we could
 472  * pass around to the attribute functions, so we don't really have
 473  * choice but implement a bunch of them...
 474  *
 475  * FIXME, it does now...
 476  */
 477 #define BUILD_SHOW_FUNC_INT(name, data)                         \
 478 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)        \
 479 {                                                               \
 480         return sprintf(buf, "%d\n", data);                      \
 481 }
 482
 483 #define BUILD_SHOW_FUNC_STR(name, data)                         \
 484 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)       \
 485 {                                                               \
 486         return sprintf(buf, "%s\n", data);                      \
 487 }
 488
 489 #define BUILD_SHOW_FUNC_FAN(name, data)                         \
 490 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)       \
 491 {                                                               \
 492         return sprintf(buf, "%d (%d rpm)\n",                    \
 493                 thermostat->last_speed[data],                   \
 494                 read_fan_speed(thermostat, FAN_SPEED[data])     \
 495                 );                                              \
 496 }
 497
 498 #define BUILD_STORE_FUNC_DEG(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         int i;                                                  \
 503         val = simple_strtol(buf, NULL, 10);                     \
 504         printk(KERN_INFO "Adjusting limits by %d degrees\n", val);      \
 505         limit_adjust = val;                                     \
 506         for (i=0; i < 3; i++)                                   \
 507                 set_limit(thermostat, i);                       \
 508         return n;                                               \
 509 }
 510
 511 #define BUILD_STORE_FUNC_INT(name, data)                        \
 512 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
 513 {                                                               \
 514         int val;                                                \
 515         val = simple_strtol(buf, NULL, 10);                     \
 516         if (val < 0 || val > 255)                               \
 517                 return -EINVAL;                                 \
 518         printk(KERN_INFO "Setting specified fan speed to %d\n", val);   \
 519         data = val;                                             \
 520         return n;                                               \
 521 }
 522
 523 BUILD_SHOW_FUNC_INT(sensor1_temperature,         (read_reg(thermostat, TEMP_REG[1])))
 524 BUILD_SHOW_FUNC_INT(sensor2_temperature,         (read_reg(thermostat, TEMP_REG[2])))
 525 BUILD_SHOW_FUNC_INT(sensor1_limit,               thermostat->limits[1])
 526 BUILD_SHOW_FUNC_INT(sensor2_limit,               thermostat->limits[2])
 527 BUILD_SHOW_FUNC_STR(sensor1_location,            sensor_location[1])
 528 BUILD_SHOW_FUNC_STR(sensor2_location,            sensor_location[2])
 529
 530 BUILD_SHOW_FUNC_INT(specified_fan_speed, fan_speed)
 531 BUILD_SHOW_FUNC_FAN(sensor1_fan_speed,   0)
 532 BUILD_SHOW_FUNC_FAN(sensor2_fan_speed,   1)
 533
 534 BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed)
 535 BUILD_SHOW_FUNC_INT(limit_adjust,        limit_adjust)
 536 BUILD_STORE_FUNC_DEG(limit_adjust,       thermostat)
 537
 538 static DEVICE_ATTR(sensor1_temperature, S_IRUGO,
 539                    show_sensor1_temperature,NULL);
 540 static DEVICE_ATTR(sensor2_temperature, S_IRUGO,
 541                    show_sensor2_temperature,NULL);
 542 static DEVICE_ATTR(sensor1_limit, S_IRUGO,
 543                    show_sensor1_limit,  NULL);
 544 static DEVICE_ATTR(sensor2_limit, S_IRUGO,
 545                    show_sensor2_limit,  NULL);
 546 static DEVICE_ATTR(sensor1_location, S_IRUGO,
 547                    show_sensor1_location, NULL);
 548 static DEVICE_ATTR(sensor2_location, S_IRUGO,
 549                    show_sensor2_location, NULL);
 550
 551 static DEVICE_ATTR(specified_fan_speed, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 552                    show_specified_fan_speed,store_specified_fan_speed);
 553
 554 static DEVICE_ATTR(sensor1_fan_speed,   S_IRUGO,
 555                    show_sensor1_fan_speed,      NULL);
 556 static DEVICE_ATTR(sensor2_fan_speed,   S_IRUGO,
 557                    show_sensor2_fan_speed,      NULL);
 558
 559 static DEVICE_ATTR(limit_adjust,        S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 560                    show_limit_adjust,   store_limit_adjust);
 561
 562
 563 static int __init
 564 thermostat_init(void)
 565 {
 566         struct device_node* np;
 567         const u32 *prop;
 568         int i = 0, offset = 0;
 569         int err;
 570
 571         np = of_find_node_by_name(NULL, "fan");
 572         if (!np)
 573                 return -ENODEV;
 574         if (of_device_is_compatible(np, "adt7460"))
 575                 therm_type = ADT7460;
 576         else if (of_device_is_compatible(np, "adt7467"))
 577                 therm_type = ADT7467;
 578         else {
 579                 of_node_put(np);
 580                 return -ENODEV;
 581         }
 582
 583         prop = of_get_property(np, "hwsensor-params-version", NULL);
 584         printk(KERN_INFO "adt746x: version %d (%ssupported)\n", *prop,
 585                          (*prop == 1)?"":"un");
 586         if (*prop != 1) {
 587                 of_node_put(np);
 588                 return -ENODEV;
 589         }
 590
 591         prop = of_get_property(np, "reg", NULL);
 592         if (!prop) {
 593                 of_node_put(np);
 594                 return -ENODEV;
 595         }
 596
 597         /* look for bus either by path or using "reg" */
 598         if (strstr(np->full_name, "/i2c-bus@") != NULL) {
 599                 const char *tmp_bus = (strstr(np->full_name, "/i2c-bus@") + 9);
 600                 therm_bus = tmp_bus[0]-'0';
 601         } else {
 602                 therm_bus = ((*prop) >> 8) & 0x0f;
 603         }
 604
 605         therm_address = ((*prop) & 0xff) >> 1;
 606
 607         printk(KERN_INFO "adt746x: Thermostat bus: %d, address: 0x%02x, "
 608                          "limit_adjust: %d, fan_speed: %d\n",
 609                          therm_bus, therm_address, limit_adjust, fan_speed);
 610
 611         if (of_get_property(np, "hwsensor-location", NULL)) {
 612                 for (i = 0; i < 3; i++) {
 613                         sensor_location[i] = of_get_property(np,
 614                                         "hwsensor-location", NULL) + offset;
 615
 616                         if (sensor_location[i] == NULL)
 617                                 sensor_location[i] = "";
 618
 619                         printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]);
 620                         offset += strlen(sensor_location[i]) + 1;
 621                 }
 622         } else {
 623                 sensor_location[0] = "?";
 624                 sensor_location[1] = "?";
 625                 sensor_location[2] = "?";
 626         }
 627
 628         of_dev = of_platform_device_create(np, "temperatures", NULL);
 629         of_node_put(np);
 630
 631         if (of_dev == NULL) {
 632                 printk(KERN_ERR "Can't register temperatures device !\n");
 633                 return -ENODEV;
 634         }
 635
 636         err = device_create_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 637         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 638         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_limit);
 639         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_limit);
 640         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_location);
 641         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_location);
 642         err |= device_create_file(&of_dev->dev, &dev_attr_limit_adjust);
 643         err |= device_create_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 644         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 645         if(therm_type == ADT7460)
 646                 err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_fan_speed);
 647         if (err)
 648                 printk(KERN_WARNING
 649                         "Failed to create tempertaure attribute file(s).\n");
 650
 651 #ifndef CONFIG_I2C_POWERMAC
 652         request_module("i2c-powermac");
 653 #endif
 654
 655         return i2c_add_driver(&thermostat_driver);
 656 }
 657
 658 static void __exit
 659 thermostat_exit(void)
 660 {
 661         if (of_dev) {
 662                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 663                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 664                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_limit);
 665                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_limit);
 666                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_location);
 667                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_location);
 668                 device_remove_file(&of_dev->dev, &dev_attr_limit_adjust);
 669                 device_remove_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 670                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 671
 672                 if(therm_type == ADT7460)
 673                         device_remove_file(&of_dev->dev,
 674                                            &dev_attr_sensor2_fan_speed);
 675
 676                 of_device_unregister(of_dev);
 677         }
 678         i2c_del_driver(&thermostat_driver);
 679 }
 680
 681 module_init(thermostat_init);
 682 module_exit(thermostat_exit);