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         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 static void thermostat_create_files(void);
  94 static void thermostat_remove_files(void);
  95
  96 static int
  97 write_reg(struct thermostat* th, int reg, u8 data)
  98 {
  99         u8 tmp[2];
 100         int rc;
 101
 102         tmp[0] = reg;
 103         tmp[1] = data;
 104         rc = i2c_master_send(th->clt, (const char *)tmp, 2);
 105         if (rc < 0)
 106                 return rc;
 107         if (rc != 2)
 108                 return -ENODEV;
 109         return 0;
 110 }
 111
 112 static int
 113 read_reg(struct thermostat* th, int reg)
 114 {
 115         u8 reg_addr, data;
 116         int rc;
 117
 118         reg_addr = (u8)reg;
 119         rc = i2c_master_send(th->clt, &reg_addr, 1);
 120         if (rc < 0)
 121                 return rc;
 122         if (rc != 1)
 123                 return -ENODEV;
 124         rc = i2c_master_recv(th->clt, (char *)&data, 1);
 125         if (rc < 0)
 126                 return rc;
 127         return data;
 128 }
 129
 130 static struct i2c_driver thermostat_driver;
 131
 132 static int
 133 attach_thermostat(struct i2c_adapter *adapter)
 134 {
 135         unsigned long bus_no;
 136         struct i2c_board_info info;
 137         struct i2c_client *client;
 138
 139         if (strncmp(adapter->name, "uni-n", 5))
 140                 return -ENODEV;
 141         bus_no = simple_strtoul(adapter->name + 6, NULL, 10);
 142         if (bus_no != therm_bus)
 143                 return -ENODEV;
 144
 145         memset(&info, 0, sizeof(struct i2c_board_info));
 146         strlcpy(info.type, "therm_adt746x", I2C_NAME_SIZE);
 147         info.addr = therm_address;
 148         client = i2c_new_device(adapter, &info);
 149         if (!client)
 150                 return -ENODEV;
 151
 152         /*
 153          * Let i2c-core delete that device on driver removal.
 154          * This is safe because i2c-core holds the core_lock mutex for us.
 155          */
 156         list_add_tail(&client->detected, &thermostat_driver.clients);
 157         return 0;
 158 }
 159
 160 static int
 161 remove_thermostat(struct i2c_client *client)
 162 {
 163         struct thermostat *th = i2c_get_clientdata(client);
 164         int i;
 165
 166         thermostat_remove_files();
 167
 168         if (thread_therm != NULL) {
 169                 kthread_stop(thread_therm);
 170         }
 171
 172         printk(KERN_INFO "adt746x: Putting max temperatures back from "
 173                          "%d, %d, %d to %d, %d, %d\n",
 174                 th->limits[0], th->limits[1], th->limits[2],
 175                 th->initial_limits[0], th->initial_limits[1],
 176                 th->initial_limits[2]);
 177
 178         for (i = 0; i < 3; i++)
 179                 write_reg(th, LIMIT_REG[i], th->initial_limits[i]);
 180
 181         write_both_fan_speed(th, -1);
 182
 183         thermostat = NULL;
 184
 185         i2c_set_clientdata(client, NULL);
 186         kfree(th);
 187
 188         return 0;
 189 }
 190
 191 static int read_fan_speed(struct thermostat *th, u8 addr)
 192 {
 193         u8 tmp[2];
 194         u16 res;
 195
 196         /* should start with low byte */
 197         tmp[1] = read_reg(th, addr);
 198         tmp[0] = read_reg(th, addr + 1);
 199
 200         res = tmp[1] + (tmp[0] << 8);
 201         /* "a value of 0xffff means that the fan has stopped" */
 202         return (res == 0xffff ? 0 : (90000*60)/res);
 203 }
 204
 205 static void write_both_fan_speed(struct thermostat *th, int speed)
 206 {
 207         write_fan_speed(th, speed, 0);
 208         if (therm_type == ADT7460)
 209                 write_fan_speed(th, speed, 1);
 210 }
 211
 212 static void write_fan_speed(struct thermostat *th, int speed, int fan)
 213 {
 214         u8 manual;
 215
 216         if (speed > 0xff)
 217                 speed = 0xff;
 218         else if (speed < -1)
 219                 speed = 0;
 220
 221         if (therm_type == ADT7467 && fan == 1)
 222                 return;
 223
 224         if (th->last_speed[fan] != speed) {
 225                 if (verbose) {
 226                         if (speed == -1)
 227                                 printk(KERN_DEBUG "adt746x: Setting speed to automatic "
 228                                         "for %s fan.\n", sensor_location[fan+1]);
 229                         else
 230                                 printk(KERN_DEBUG "adt746x: Setting speed to %d "
 231                                         "for %s fan.\n", speed, sensor_location[fan+1]);
 232                 }
 233         } else
 234                 return;
 235
 236         if (speed >= 0) {
 237                 manual = read_reg(th, MANUAL_MODE[fan]);
 238                 manual &= ~INVERT_MASK;
 239                 write_reg(th, MANUAL_MODE[fan],
 240                         manual | MANUAL_MASK | th->pwm_inv[fan]);
 241                 write_reg(th, FAN_SPD_SET[fan], speed);
 242         } else {
 243                 /* back to automatic */
 244                 if(therm_type == ADT7460) {
 245                         manual = read_reg(th,
 246                                 MANUAL_MODE[fan]) & (~MANUAL_MASK);
 247                         manual &= ~INVERT_MASK;
 248                         manual |= th->pwm_inv[fan];
 249                         write_reg(th,
 250                                 MANUAL_MODE[fan], manual|REM_CONTROL[fan]);
 251                 } else {
 252                         manual = read_reg(th, MANUAL_MODE[fan]);
 253                         manual &= ~INVERT_MASK;
 254                         manual |= th->pwm_inv[fan];
 255                         write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK));
 256                 }
 257         }
 258
 259         th->last_speed[fan] = speed;
 260 }
 261
 262 static void read_sensors(struct thermostat *th)
 263 {
 264         int i = 0;
 265
 266         for (i = 0; i < 3; i++)
 267                 th->temps[i]  = read_reg(th, TEMP_REG[i]);
 268 }
 269
 270 #ifdef DEBUG
 271 static void display_stats(struct thermostat *th)
 272 {
 273         if (th->temps[0] != th->cached_temp[0]
 274         ||  th->temps[1] != th->cached_temp[1]
 275         ||  th->temps[2] != th->cached_temp[2]) {
 276                 printk(KERN_INFO "adt746x: Temperature infos:"
 277                                  " thermostats: %d,%d,%d;"
 278                                  " limits: %d,%d,%d;"
 279                                  " fan speed: %d RPM\n",
 280                                  th->temps[0], th->temps[1], th->temps[2],
 281                                  th->limits[0],  th->limits[1],  th->limits[2],
 282                                  read_fan_speed(th, FAN_SPEED[0]));
 283         }
 284         th->cached_temp[0] = th->temps[0];
 285         th->cached_temp[1] = th->temps[1];
 286         th->cached_temp[2] = th->temps[2];
 287 }
 288 #endif
 289
 290 static void update_fans_speed (struct thermostat *th)
 291 {
 292         int lastvar = 0; /* last variation, for iBook */
 293         int i = 0;
 294
 295         /* we don't care about local sensor, so we start at sensor 1 */
 296         for (i = 1; i < 3; i++) {
 297                 int started = 0;
 298                 int fan_number = (therm_type == ADT7460 && i == 2);
 299                 int var = th->temps[i] - th->limits[i];
 300
 301                 if (var > -1) {
 302                         int step = (255 - fan_speed) / 7;
 303                         int new_speed = 0;
 304
 305                         /* hysteresis : change fan speed only if variation is
 306                          * more than two degrees */
 307                         if (abs(var - th->last_var[fan_number]) < 2)
 308                                 continue;
 309
 310                         started = 1;
 311                         new_speed = fan_speed + ((var-1)*step);
 312
 313                         if (new_speed < fan_speed)
 314                                 new_speed = fan_speed;
 315                         if (new_speed > 255)
 316                                 new_speed = 255;
 317
 318                         if (verbose)
 319                                 printk(KERN_DEBUG "adt746x: Setting fans speed to %d "
 320                                                  "(limit exceeded by %d on %s)\n",
 321                                                 new_speed, var,
 322                                                 sensor_location[fan_number+1]);
 323                         write_both_fan_speed(th, new_speed);
 324                         th->last_var[fan_number] = var;
 325                 } else if (var < -2) {
 326                         /* don't stop fan if sensor2 is cold and sensor1 is not
 327                          * so cold (lastvar >= -1) */
 328                         if (i == 2 && lastvar < -1) {
 329                                 if (th->last_speed[fan_number] != 0)
 330                                         if (verbose)
 331                                                 printk(KERN_DEBUG "adt746x: Stopping "
 332                                                         "fans.\n");
 333                                 write_both_fan_speed(th, 0);
 334                         }
 335                 }
 336
 337                 lastvar = var;
 338
 339                 if (started)
 340                         return; /* we don't want to re-stop the fan
 341                                 * if sensor1 is heating and sensor2 is not */
 342         }
 343 }
 344
 345 static int monitor_task(void *arg)
 346 {
 347         struct thermostat* th = arg;
 348
 349         set_freezable();
 350         while(!kthread_should_stop()) {
 351                 try_to_freeze();
 352                 msleep_interruptible(2000);
 353
 354 #ifndef DEBUG
 355                 if (fan_speed != -1)
 356                         read_sensors(th);
 357 #else
 358                 read_sensors(th);
 359 #endif
 360
 361                 if (fan_speed != -1)
 362                         update_fans_speed(th);
 363
 364 #ifdef DEBUG
 365                 display_stats(th);
 366 #endif
 367
 368         }
 369
 370         return 0;
 371 }
 372
 373 static void set_limit(struct thermostat *th, int i)
 374 {
 375                 /* Set sensor1 limit higher to avoid powerdowns */
 376                 th->limits[i] = default_limits_chip[i] + limit_adjust;
 377                 write_reg(th, LIMIT_REG[i], th->limits[i]);
 378
 379                 /* set our limits to normal */
 380                 th->limits[i] = default_limits_local[i] + limit_adjust;
 381 }
 382
 383 static int probe_thermostat(struct i2c_client *client,
 384                             const struct i2c_device_id *id)
 385 {
 386         struct thermostat* th;
 387         int rc;
 388         int i;
 389
 390         if (thermostat)
 391                 return 0;
 392
 393         th = kzalloc(sizeof(struct thermostat), GFP_KERNEL);
 394         if (!th)
 395                 return -ENOMEM;
 396
 397         i2c_set_clientdata(client, th);
 398         th->clt = client;
 399
 400         rc = read_reg(th, CONFIG_REG);
 401         if (rc < 0) {
 402                 dev_err(&client->dev, "Thermostat failed to read config!\n");
 403                 i2c_set_clientdata(client, NULL);
 404                 kfree(th);
 405                 return -ENODEV;
 406         }
 407
 408         /* force manual control to start the fan quieter */
 409         if (fan_speed == -1)
 410                 fan_speed = 64;
 411
 412         if(therm_type == ADT7460) {
 413                 printk(KERN_INFO "adt746x: ADT7460 initializing\n");
 414                 /* The 7460 needs to be started explicitly */
 415                 write_reg(th, CONFIG_REG, 1);
 416         } else
 417                 printk(KERN_INFO "adt746x: ADT7467 initializing\n");
 418
 419         for (i = 0; i < 3; i++) {
 420                 th->initial_limits[i] = read_reg(th, LIMIT_REG[i]);
 421                 set_limit(th, i);
 422         }
 423
 424         printk(KERN_INFO "adt746x: Lowering max temperatures from %d, %d, %d"
 425                          " to %d, %d, %d\n",
 426                          th->initial_limits[0], th->initial_limits[1],
 427                          th->initial_limits[2], th->limits[0], th->limits[1],
 428                          th->limits[2]);
 429
 430         thermostat = th;
 431
 432         /* record invert bit status because fw can corrupt it after suspend */
 433         th->pwm_inv[0] = read_reg(th, MANUAL_MODE[0]) & INVERT_MASK;
 434         th->pwm_inv[1] = read_reg(th, MANUAL_MODE[1]) & INVERT_MASK;
 435
 436         /* be sure to really write fan speed the first time */
 437         th->last_speed[0] = -2;
 438         th->last_speed[1] = -2;
 439         th->last_var[0] = -80;
 440         th->last_var[1] = -80;
 441
 442         if (fan_speed != -1) {
 443                 /* manual mode, stop fans */
 444                 write_both_fan_speed(th, 0);
 445         } else {
 446                 /* automatic mode */
 447                 write_both_fan_speed(th, -1);
 448         }
 449
 450         thread_therm = kthread_run(monitor_task, th, "kfand");
 451
 452         if (thread_therm == ERR_PTR(-ENOMEM)) {
 453                 printk(KERN_INFO "adt746x: Kthread creation failed\n");
 454                 thread_therm = NULL;
 455                 return -ENOMEM;
 456         }
 457
 458         thermostat_create_files();
 459
 460         return 0;
 461 }
 462
 463 static const struct i2c_device_id therm_adt746x_id[] = {
 464         { "therm_adt746x", 0 },
 465         { }
 466 };
 467
 468 static struct i2c_driver thermostat_driver = {
 469         .driver = {
 470                 .name   = "therm_adt746x",
 471         },
 472         .attach_adapter = attach_thermostat,
 473         .probe = probe_thermostat,
 474         .remove = remove_thermostat,
 475         .id_table = therm_adt746x_id,
 476 };
 477
 478 /*
 479  * Now, unfortunately, sysfs doesn't give us a nice void * we could
 480  * pass around to the attribute functions, so we don't really have
 481  * choice but implement a bunch of them...
 482  *
 483  * FIXME, it does now...
 484  */
 485 #define BUILD_SHOW_FUNC_INT(name, data)                         \
 486 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)        \
 487 {                                                               \
 488         return sprintf(buf, "%d\n", data);                      \
 489 }
 490
 491 #define BUILD_SHOW_FUNC_STR(name, data)                         \
 492 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)       \
 493 {                                                               \
 494         return sprintf(buf, "%s\n", data);                      \
 495 }
 496
 497 #define BUILD_SHOW_FUNC_FAN(name, data)                         \
 498 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)       \
 499 {                                                               \
 500         return sprintf(buf, "%d (%d rpm)\n",                    \
 501                 thermostat->last_speed[data],                   \
 502                 read_fan_speed(thermostat, FAN_SPEED[data])     \
 503                 );                                              \
 504 }
 505
 506 #define BUILD_STORE_FUNC_DEG(name, data)                        \
 507 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
 508 {                                                               \
 509         int val;                                                \
 510         int i;                                                  \
 511         val = simple_strtol(buf, NULL, 10);                     \
 512         printk(KERN_INFO "Adjusting limits by %d degrees\n", val);      \
 513         limit_adjust = val;                                     \
 514         for (i=0; i < 3; i++)                                   \
 515                 set_limit(thermostat, i);                       \
 516         return n;                                               \
 517 }
 518
 519 #define BUILD_STORE_FUNC_INT(name, data)                        \
 520 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
 521 {                                                               \
 522         int val;                                                \
 523         val = simple_strtol(buf, NULL, 10);                     \
 524         if (val < 0 || val > 255)                               \
 525                 return -EINVAL;                                 \
 526         printk(KERN_INFO "Setting specified fan speed to %d\n", val);   \
 527         data = val;                                             \
 528         return n;                                               \
 529 }
 530
 531 BUILD_SHOW_FUNC_INT(sensor1_temperature,         (read_reg(thermostat, TEMP_REG[1])))
 532 BUILD_SHOW_FUNC_INT(sensor2_temperature,         (read_reg(thermostat, TEMP_REG[2])))
 533 BUILD_SHOW_FUNC_INT(sensor1_limit,               thermostat->limits[1])
 534 BUILD_SHOW_FUNC_INT(sensor2_limit,               thermostat->limits[2])
 535 BUILD_SHOW_FUNC_STR(sensor1_location,            sensor_location[1])
 536 BUILD_SHOW_FUNC_STR(sensor2_location,            sensor_location[2])
 537
 538 BUILD_SHOW_FUNC_INT(specified_fan_speed, fan_speed)
 539 BUILD_SHOW_FUNC_FAN(sensor1_fan_speed,   0)
 540 BUILD_SHOW_FUNC_FAN(sensor2_fan_speed,   1)
 541
 542 BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed)
 543 BUILD_SHOW_FUNC_INT(limit_adjust,        limit_adjust)
 544 BUILD_STORE_FUNC_DEG(limit_adjust,       thermostat)
 545
 546 static DEVICE_ATTR(sensor1_temperature, S_IRUGO,
 547                    show_sensor1_temperature,NULL);
 548 static DEVICE_ATTR(sensor2_temperature, S_IRUGO,
 549                    show_sensor2_temperature,NULL);
 550 static DEVICE_ATTR(sensor1_limit, S_IRUGO,
 551                    show_sensor1_limit,  NULL);
 552 static DEVICE_ATTR(sensor2_limit, S_IRUGO,
 553                    show_sensor2_limit,  NULL);
 554 static DEVICE_ATTR(sensor1_location, S_IRUGO,
 555                    show_sensor1_location, NULL);
 556 static DEVICE_ATTR(sensor2_location, S_IRUGO,
 557                    show_sensor2_location, NULL);
 558
 559 static DEVICE_ATTR(specified_fan_speed, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 560                    show_specified_fan_speed,store_specified_fan_speed);
 561
 562 static DEVICE_ATTR(sensor1_fan_speed,   S_IRUGO,
 563                    show_sensor1_fan_speed,      NULL);
 564 static DEVICE_ATTR(sensor2_fan_speed,   S_IRUGO,
 565                    show_sensor2_fan_speed,      NULL);
 566
 567 static DEVICE_ATTR(limit_adjust,        S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 568                    show_limit_adjust,   store_limit_adjust);
 569
 570
 571 static int __init
 572 thermostat_init(void)
 573 {
 574         struct device_node* np;
 575         const u32 *prop;
 576         int i = 0, offset = 0;
 577
 578         np = of_find_node_by_name(NULL, "fan");
 579         if (!np)
 580                 return -ENODEV;
 581         if (of_device_is_compatible(np, "adt7460"))
 582                 therm_type = ADT7460;
 583         else if (of_device_is_compatible(np, "adt7467"))
 584                 therm_type = ADT7467;
 585         else {
 586                 of_node_put(np);
 587                 return -ENODEV;
 588         }
 589
 590         prop = of_get_property(np, "hwsensor-params-version", NULL);
 591         printk(KERN_INFO "adt746x: version %d (%ssupported)\n", *prop,
 592                          (*prop == 1)?"":"un");
 593         if (*prop != 1) {
 594                 of_node_put(np);
 595                 return -ENODEV;
 596         }
 597
 598         prop = of_get_property(np, "reg", NULL);
 599         if (!prop) {
 600                 of_node_put(np);
 601                 return -ENODEV;
 602         }
 603
 604         /* look for bus either by path or using "reg" */
 605         if (strstr(np->full_name, "/i2c-bus@") != NULL) {
 606                 const char *tmp_bus = (strstr(np->full_name, "/i2c-bus@") + 9);
 607                 therm_bus = tmp_bus[0]-'0';
 608         } else {
 609                 therm_bus = ((*prop) >> 8) & 0x0f;
 610         }
 611
 612         therm_address = ((*prop) & 0xff) >> 1;
 613
 614         printk(KERN_INFO "adt746x: Thermostat bus: %d, address: 0x%02x, "
 615                          "limit_adjust: %d, fan_speed: %d\n",
 616                          therm_bus, therm_address, limit_adjust, fan_speed);
 617
 618         if (of_get_property(np, "hwsensor-location", NULL)) {
 619                 for (i = 0; i < 3; i++) {
 620                         sensor_location[i] = of_get_property(np,
 621                                         "hwsensor-location", NULL) + offset;
 622
 623                         if (sensor_location[i] == NULL)
 624                                 sensor_location[i] = "";
 625
 626                         printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]);
 627                         offset += strlen(sensor_location[i]) + 1;
 628                 }
 629         } else {
 630                 sensor_location[0] = "?";
 631                 sensor_location[1] = "?";
 632                 sensor_location[2] = "?";
 633         }
 634
 635         of_dev = of_platform_device_create(np, "temperatures", NULL);
 636         of_node_put(np);
 637
 638         if (of_dev == NULL) {
 639                 printk(KERN_ERR "Can't register temperatures device !\n");
 640                 return -ENODEV;
 641         }
 642
 643 #ifndef CONFIG_I2C_POWERMAC
 644         request_module("i2c-powermac");
 645 #endif
 646
 647         return i2c_add_driver(&thermostat_driver);
 648 }
 649
 650 static void thermostat_create_files(void)
 651 {
 652         int err;
 653
 654         err = device_create_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 655         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 656         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_limit);
 657         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_limit);
 658         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_location);
 659         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_location);
 660         err |= device_create_file(&of_dev->dev, &dev_attr_limit_adjust);
 661         err |= device_create_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 662         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 663         if(therm_type == ADT7460)
 664                 err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_fan_speed);
 665         if (err)
 666                 printk(KERN_WARNING
 667                         "Failed to create tempertaure attribute file(s).\n");
 668 }
 669
 670 static void thermostat_remove_files(void)
 671 {
 672         if (of_dev) {
 673                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 674                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 675                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_limit);
 676                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_limit);
 677                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_location);
 678                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_location);
 679                 device_remove_file(&of_dev->dev, &dev_attr_limit_adjust);
 680                 device_remove_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 681                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 682
 683                 if(therm_type == ADT7460)
 684                         device_remove_file(&of_dev->dev,
 685                                            &dev_attr_sensor2_fan_speed);
 686
 687         }
 688 }
 689
 690 static void __exit
 691 thermostat_exit(void)
 692 {
 693         i2c_del_driver(&thermostat_driver);
 694         of_device_unregister(of_dev);
 695 }
 696
 697 module_init(thermostat_init);
 698 module_exit(thermostat_exit);