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 115254175ADT7467_pra.pdf and 3686221171167ADT7460_b.pdf
   7  * http://www.onsemi.com/PowerSolutions/product.do?id=ADT7467
   8  * http://www.onsemi.com/PowerSolutions/product.do?id=ADT7460
   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 platform_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         kfree(th);
 186
 187         return 0;
 188 }
 189
 190 static int read_fan_speed(struct thermostat *th, u8 addr)
 191 {
 192         u8 tmp[2];
 193         u16 res;
 194
 195         /* should start with low byte */
 196         tmp[1] = read_reg(th, addr);
 197         tmp[0] = read_reg(th, addr + 1);
 198
 199         res = tmp[1] + (tmp[0] << 8);
 200         /* "a value of 0xffff means that the fan has stopped" */
 201         return (res == 0xffff ? 0 : (90000*60)/res);
 202 }
 203
 204 static void write_both_fan_speed(struct thermostat *th, int speed)
 205 {
 206         write_fan_speed(th, speed, 0);
 207         if (therm_type == ADT7460)
 208                 write_fan_speed(th, speed, 1);
 209 }
 210
 211 static void write_fan_speed(struct thermostat *th, int speed, int fan)
 212 {
 213         u8 manual;
 214
 215         if (speed > 0xff)
 216                 speed = 0xff;
 217         else if (speed < -1)
 218                 speed = 0;
 219
 220         if (therm_type == ADT7467 && fan == 1)
 221                 return;
 222
 223         if (th->last_speed[fan] != speed) {
 224                 if (verbose) {
 225                         if (speed == -1)
 226                                 printk(KERN_DEBUG "adt746x: Setting speed to automatic "
 227                                         "for %s fan.\n", sensor_location[fan+1]);
 228                         else
 229                                 printk(KERN_DEBUG "adt746x: Setting speed to %d "
 230                                         "for %s fan.\n", speed, sensor_location[fan+1]);
 231                 }
 232         } else
 233                 return;
 234
 235         if (speed >= 0) {
 236                 manual = read_reg(th, MANUAL_MODE[fan]);
 237                 manual &= ~INVERT_MASK;
 238                 write_reg(th, MANUAL_MODE[fan],
 239                         manual | MANUAL_MASK | th->pwm_inv[fan]);
 240                 write_reg(th, FAN_SPD_SET[fan], speed);
 241         } else {
 242                 /* back to automatic */
 243                 if(therm_type == ADT7460) {
 244                         manual = read_reg(th,
 245                                 MANUAL_MODE[fan]) & (~MANUAL_MASK);
 246                         manual &= ~INVERT_MASK;
 247                         manual |= th->pwm_inv[fan];
 248                         write_reg(th,
 249                                 MANUAL_MODE[fan], manual|REM_CONTROL[fan]);
 250                 } else {
 251                         manual = read_reg(th, MANUAL_MODE[fan]);
 252                         manual &= ~INVERT_MASK;
 253                         manual |= th->pwm_inv[fan];
 254                         write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK));
 255                 }
 256         }
 257
 258         th->last_speed[fan] = speed;
 259 }
 260
 261 static void read_sensors(struct thermostat *th)
 262 {
 263         int i = 0;
 264
 265         for (i = 0; i < 3; i++)
 266                 th->temps[i]  = read_reg(th, TEMP_REG[i]);
 267 }
 268
 269 #ifdef DEBUG
 270 static void display_stats(struct thermostat *th)
 271 {
 272         if (th->temps[0] != th->cached_temp[0]
 273         ||  th->temps[1] != th->cached_temp[1]
 274         ||  th->temps[2] != th->cached_temp[2]) {
 275                 printk(KERN_INFO "adt746x: Temperature infos:"
 276                                  " thermostats: %d,%d,%d;"
 277                                  " limits: %d,%d,%d;"
 278                                  " fan speed: %d RPM\n",
 279                                  th->temps[0], th->temps[1], th->temps[2],
 280                                  th->limits[0],  th->limits[1],  th->limits[2],
 281                                  read_fan_speed(th, FAN_SPEED[0]));
 282         }
 283         th->cached_temp[0] = th->temps[0];
 284         th->cached_temp[1] = th->temps[1];
 285         th->cached_temp[2] = th->temps[2];
 286 }
 287 #endif
 288
 289 static void update_fans_speed (struct thermostat *th)
 290 {
 291         int lastvar = 0; /* last variation, for iBook */
 292         int i = 0;
 293
 294         /* we don't care about local sensor, so we start at sensor 1 */
 295         for (i = 1; i < 3; i++) {
 296                 int started = 0;
 297                 int fan_number = (therm_type == ADT7460 && i == 2);
 298                 int var = th->temps[i] - th->limits[i];
 299
 300                 if (var > -1) {
 301                         int step = (255 - fan_speed) / 7;
 302                         int new_speed = 0;
 303
 304                         /* hysteresis : change fan speed only if variation is
 305                          * more than two degrees */
 306                         if (abs(var - th->last_var[fan_number]) < 2)
 307                                 continue;
 308
 309                         started = 1;
 310                         new_speed = fan_speed + ((var-1)*step);
 311
 312                         if (new_speed < fan_speed)
 313                                 new_speed = fan_speed;
 314                         if (new_speed > 255)
 315                                 new_speed = 255;
 316
 317                         if (verbose)
 318                                 printk(KERN_DEBUG "adt746x: Setting fans speed to %d "
 319                                                  "(limit exceeded by %d on %s)\n",
 320                                                 new_speed, var,
 321                                                 sensor_location[fan_number+1]);
 322                         write_both_fan_speed(th, new_speed);
 323                         th->last_var[fan_number] = var;
 324                 } else if (var < -2) {
 325                         /* don't stop fan if sensor2 is cold and sensor1 is not
 326                          * so cold (lastvar >= -1) */
 327                         if (i == 2 && lastvar < -1) {
 328                                 if (th->last_speed[fan_number] != 0)
 329                                         if (verbose)
 330                                                 printk(KERN_DEBUG "adt746x: Stopping "
 331                                                         "fans.\n");
 332                                 write_both_fan_speed(th, 0);
 333                         }
 334                 }
 335
 336                 lastvar = var;
 337
 338                 if (started)
 339                         return; /* we don't want to re-stop the fan
 340                                 * if sensor1 is heating and sensor2 is not */
 341         }
 342 }
 343
 344 static int monitor_task(void *arg)
 345 {
 346         struct thermostat* th = arg;
 347
 348         set_freezable();
 349         while(!kthread_should_stop()) {
 350                 try_to_freeze();
 351                 msleep_interruptible(2000);
 352
 353 #ifndef DEBUG
 354                 if (fan_speed != -1)
 355                         read_sensors(th);
 356 #else
 357                 read_sensors(th);
 358 #endif
 359
 360                 if (fan_speed != -1)
 361                         update_fans_speed(th);
 362
 363 #ifdef DEBUG
 364                 display_stats(th);
 365 #endif
 366
 367         }
 368
 369         return 0;
 370 }
 371
 372 static void set_limit(struct thermostat *th, int i)
 373 {
 374                 /* Set sensor1 limit higher to avoid powerdowns */
 375                 th->limits[i] = default_limits_chip[i] + limit_adjust;
 376                 write_reg(th, LIMIT_REG[i], th->limits[i]);
 377
 378                 /* set our limits to normal */
 379                 th->limits[i] = default_limits_local[i] + limit_adjust;
 380 }
 381
 382 static int probe_thermostat(struct i2c_client *client,
 383                             const struct i2c_device_id *id)
 384 {
 385         struct thermostat* th;
 386         int rc;
 387         int i;
 388
 389         if (thermostat)
 390                 return 0;
 391
 392         th = kzalloc(sizeof(struct thermostat), GFP_KERNEL);
 393         if (!th)
 394                 return -ENOMEM;
 395
 396         i2c_set_clientdata(client, th);
 397         th->clt = client;
 398
 399         rc = read_reg(th, CONFIG_REG);
 400         if (rc < 0) {
 401                 dev_err(&client->dev, "Thermostat failed to read config!\n");
 402                 kfree(th);
 403                 return -ENODEV;
 404         }
 405
 406         /* force manual control to start the fan quieter */
 407         if (fan_speed == -1)
 408                 fan_speed = 64;
 409
 410         if(therm_type == ADT7460) {
 411                 printk(KERN_INFO "adt746x: ADT7460 initializing\n");
 412                 /* The 7460 needs to be started explicitly */
 413                 write_reg(th, CONFIG_REG, 1);
 414         } else
 415                 printk(KERN_INFO "adt746x: ADT7467 initializing\n");
 416
 417         for (i = 0; i < 3; i++) {
 418                 th->initial_limits[i] = read_reg(th, LIMIT_REG[i]);
 419                 set_limit(th, i);
 420         }
 421
 422         printk(KERN_INFO "adt746x: Lowering max temperatures from %d, %d, %d"
 423                          " to %d, %d, %d\n",
 424                          th->initial_limits[0], th->initial_limits[1],
 425                          th->initial_limits[2], th->limits[0], th->limits[1],
 426                          th->limits[2]);
 427
 428         thermostat = th;
 429
 430         /* record invert bit status because fw can corrupt it after suspend */
 431         th->pwm_inv[0] = read_reg(th, MANUAL_MODE[0]) & INVERT_MASK;
 432         th->pwm_inv[1] = read_reg(th, MANUAL_MODE[1]) & INVERT_MASK;
 433
 434         /* be sure to really write fan speed the first time */
 435         th->last_speed[0] = -2;
 436         th->last_speed[1] = -2;
 437         th->last_var[0] = -80;
 438         th->last_var[1] = -80;
 439
 440         if (fan_speed != -1) {
 441                 /* manual mode, stop fans */
 442                 write_both_fan_speed(th, 0);
 443         } else {
 444                 /* automatic mode */
 445                 write_both_fan_speed(th, -1);
 446         }
 447
 448         thread_therm = kthread_run(monitor_task, th, "kfand");
 449
 450         if (thread_therm == ERR_PTR(-ENOMEM)) {
 451                 printk(KERN_INFO "adt746x: Kthread creation failed\n");
 452                 thread_therm = NULL;
 453                 return -ENOMEM;
 454         }
 455
 456         thermostat_create_files();
 457
 458         return 0;
 459 }
 460
 461 static const struct i2c_device_id therm_adt746x_id[] = {
 462         { "therm_adt746x", 0 },
 463         { }
 464 };
 465
 466 static struct i2c_driver thermostat_driver = {
 467         .driver = {
 468                 .name   = "therm_adt746x",
 469         },
 470         .attach_adapter = attach_thermostat,
 471         .probe = probe_thermostat,
 472         .remove = remove_thermostat,
 473         .id_table = therm_adt746x_id,
 474 };
 475
 476 /*
 477  * Now, unfortunately, sysfs doesn't give us a nice void * we could
 478  * pass around to the attribute functions, so we don't really have
 479  * choice but implement a bunch of them...
 480  *
 481  * FIXME, it does now...
 482  */
 483 #define BUILD_SHOW_FUNC_INT(name, data)                         \
 484 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)        \
 485 {                                                               \
 486         return sprintf(buf, "%d\n", data);                      \
 487 }
 488
 489 #define BUILD_SHOW_FUNC_STR(name, data)                         \
 490 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)       \
 491 {                                                               \
 492         return sprintf(buf, "%s\n", data);                      \
 493 }
 494
 495 #define BUILD_SHOW_FUNC_FAN(name, data)                         \
 496 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)       \
 497 {                                                               \
 498         return sprintf(buf, "%d (%d rpm)\n",                    \
 499                 thermostat->last_speed[data],                   \
 500                 read_fan_speed(thermostat, FAN_SPEED[data])     \
 501                 );                                              \
 502 }
 503
 504 #define BUILD_STORE_FUNC_DEG(name, data)                        \
 505 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
 506 {                                                               \
 507         int val;                                                \
 508         int i;                                                  \
 509         val = simple_strtol(buf, NULL, 10);                     \
 510         printk(KERN_INFO "Adjusting limits by %d degrees\n", val);      \
 511         limit_adjust = val;                                     \
 512         for (i=0; i < 3; i++)                                   \
 513                 set_limit(thermostat, i);                       \
 514         return n;                                               \
 515 }
 516
 517 #define BUILD_STORE_FUNC_INT(name, data)                        \
 518 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
 519 {                                                               \
 520         int val;                                                \
 521         val = simple_strtol(buf, NULL, 10);                     \
 522         if (val < 0 || val > 255)                               \
 523                 return -EINVAL;                                 \
 524         printk(KERN_INFO "Setting specified fan speed to %d\n", val);   \
 525         data = val;                                             \
 526         return n;                                               \
 527 }
 528
 529 BUILD_SHOW_FUNC_INT(sensor1_temperature,         (read_reg(thermostat, TEMP_REG[1])))
 530 BUILD_SHOW_FUNC_INT(sensor2_temperature,         (read_reg(thermostat, TEMP_REG[2])))
 531 BUILD_SHOW_FUNC_INT(sensor1_limit,               thermostat->limits[1])
 532 BUILD_SHOW_FUNC_INT(sensor2_limit,               thermostat->limits[2])
 533 BUILD_SHOW_FUNC_STR(sensor1_location,            sensor_location[1])
 534 BUILD_SHOW_FUNC_STR(sensor2_location,            sensor_location[2])
 535
 536 BUILD_SHOW_FUNC_INT(specified_fan_speed, fan_speed)
 537 BUILD_SHOW_FUNC_FAN(sensor1_fan_speed,   0)
 538 BUILD_SHOW_FUNC_FAN(sensor2_fan_speed,   1)
 539
 540 BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed)
 541 BUILD_SHOW_FUNC_INT(limit_adjust,        limit_adjust)
 542 BUILD_STORE_FUNC_DEG(limit_adjust,       thermostat)
 543
 544 static DEVICE_ATTR(sensor1_temperature, S_IRUGO,
 545                    show_sensor1_temperature,NULL);
 546 static DEVICE_ATTR(sensor2_temperature, S_IRUGO,
 547                    show_sensor2_temperature,NULL);
 548 static DEVICE_ATTR(sensor1_limit, S_IRUGO,
 549                    show_sensor1_limit,  NULL);
 550 static DEVICE_ATTR(sensor2_limit, S_IRUGO,
 551                    show_sensor2_limit,  NULL);
 552 static DEVICE_ATTR(sensor1_location, S_IRUGO,
 553                    show_sensor1_location, NULL);
 554 static DEVICE_ATTR(sensor2_location, S_IRUGO,
 555                    show_sensor2_location, NULL);
 556
 557 static DEVICE_ATTR(specified_fan_speed, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 558                    show_specified_fan_speed,store_specified_fan_speed);
 559
 560 static DEVICE_ATTR(sensor1_fan_speed,   S_IRUGO,
 561                    show_sensor1_fan_speed,      NULL);
 562 static DEVICE_ATTR(sensor2_fan_speed,   S_IRUGO,
 563                    show_sensor2_fan_speed,      NULL);
 564
 565 static DEVICE_ATTR(limit_adjust,        S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 566                    show_limit_adjust,   store_limit_adjust);
 567
 568
 569 static int __init
 570 thermostat_init(void)
 571 {
 572         struct device_node* np;
 573         const u32 *prop;
 574         int i = 0, offset = 0;
 575
 576         np = of_find_node_by_name(NULL, "fan");
 577         if (!np)
 578                 return -ENODEV;
 579         if (of_device_is_compatible(np, "adt7460"))
 580                 therm_type = ADT7460;
 581         else if (of_device_is_compatible(np, "adt7467"))
 582                 therm_type = ADT7467;
 583         else {
 584                 of_node_put(np);
 585                 return -ENODEV;
 586         }
 587
 588         prop = of_get_property(np, "hwsensor-params-version", NULL);
 589         printk(KERN_INFO "adt746x: version %d (%ssupported)\n", *prop,
 590                          (*prop == 1)?"":"un");
 591         if (*prop != 1) {
 592                 of_node_put(np);
 593                 return -ENODEV;
 594         }
 595
 596         prop = of_get_property(np, "reg", NULL);
 597         if (!prop) {
 598                 of_node_put(np);
 599                 return -ENODEV;
 600         }
 601
 602         /* look for bus either by path or using "reg" */
 603         if (strstr(np->full_name, "/i2c-bus@") != NULL) {
 604                 const char *tmp_bus = (strstr(np->full_name, "/i2c-bus@") + 9);
 605                 therm_bus = tmp_bus[0]-'0';
 606         } else {
 607                 therm_bus = ((*prop) >> 8) & 0x0f;
 608         }
 609
 610         therm_address = ((*prop) & 0xff) >> 1;
 611
 612         printk(KERN_INFO "adt746x: Thermostat bus: %d, address: 0x%02x, "
 613                          "limit_adjust: %d, fan_speed: %d\n",
 614                          therm_bus, therm_address, limit_adjust, fan_speed);
 615
 616         if (of_get_property(np, "hwsensor-location", NULL)) {
 617                 for (i = 0; i < 3; i++) {
 618                         sensor_location[i] = of_get_property(np,
 619                                         "hwsensor-location", NULL) + offset;
 620
 621                         if (sensor_location[i] == NULL)
 622                                 sensor_location[i] = "";
 623
 624                         printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]);
 625                         offset += strlen(sensor_location[i]) + 1;
 626                 }
 627         } else {
 628                 sensor_location[0] = "?";
 629                 sensor_location[1] = "?";
 630                 sensor_location[2] = "?";
 631         }
 632
 633         of_dev = of_platform_device_create(np, "temperatures", NULL);
 634         of_node_put(np);
 635
 636         if (of_dev == NULL) {
 637                 printk(KERN_ERR "Can't register temperatures device !\n");
 638                 return -ENODEV;
 639         }
 640
 641 #ifndef CONFIG_I2C_POWERMAC
 642         request_module("i2c-powermac");
 643 #endif
 644
 645         return i2c_add_driver(&thermostat_driver);
 646 }
 647
 648 static void thermostat_create_files(void)
 649 {
 650         int err;
 651
 652         err = device_create_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 653         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 654         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_limit);
 655         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_limit);
 656         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_location);
 657         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_location);
 658         err |= device_create_file(&of_dev->dev, &dev_attr_limit_adjust);
 659         err |= device_create_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 660         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 661         if(therm_type == ADT7460)
 662                 err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_fan_speed);
 663         if (err)
 664                 printk(KERN_WARNING
 665                         "Failed to create temperature attribute file(s).\n");
 666 }
 667
 668 static void thermostat_remove_files(void)
 669 {
 670         if (of_dev) {
 671                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 672                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 673                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_limit);
 674                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_limit);
 675                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_location);
 676                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_location);
 677                 device_remove_file(&of_dev->dev, &dev_attr_limit_adjust);
 678                 device_remove_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 679                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 680
 681                 if(therm_type == ADT7460)
 682                         device_remove_file(&of_dev->dev,
 683                                            &dev_attr_sensor2_fan_speed);
 684
 685         }
 686 }
 687
 688 static void __exit
 689 thermostat_exit(void)
 690 {
 691         i2c_del_driver(&thermostat_driver);
 692         of_device_unregister(of_dev);
 693 }
 694
 695 module_init(thermostat_init);
 696 module_exit(thermostat_exit);