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/sections.h>
  33
  34 #undef DEBUG
  35
  36 #define CONFIG_REG   0x40
  37 #define MANUAL_MASK  0xe0
  38 #define AUTO_MASK    0x20
  39 #define INVERT_MASK  0x10
  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 bool 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         int                     pwm_inv[2];
  82 };
  83
  84 static enum {ADT7460, ADT7467} therm_type;
  85 static int therm_bus, therm_address;
  86 static struct platform_device * of_dev;
  87 static struct thermostat* thermostat;
  88 static struct task_struct *thread_therm = NULL;
  89
  90 static void write_both_fan_speed(struct thermostat *th, int speed);
  91 static void write_fan_speed(struct thermostat *th, int speed, int fan);
  92 static void thermostat_create_files(void);
  93 static void thermostat_remove_files(void);
  94
  95 static int
  96 write_reg(struct thermostat* th, int reg, u8 data)
  97 {
  98         u8 tmp[2];
  99         int rc;
 100
 101         tmp[0] = reg;
 102         tmp[1] = data;
 103         rc = i2c_master_send(th->clt, (const char *)tmp, 2);
 104         if (rc < 0)
 105                 return rc;
 106         if (rc != 2)
 107                 return -ENODEV;
 108         return 0;
 109 }
 110
 111 static int
 112 read_reg(struct thermostat* th, int reg)
 113 {
 114         u8 reg_addr, data;
 115         int rc;
 116
 117         reg_addr = (u8)reg;
 118         rc = i2c_master_send(th->clt, &reg_addr, 1);
 119         if (rc < 0)
 120                 return rc;
 121         if (rc != 1)
 122                 return -ENODEV;
 123         rc = i2c_master_recv(th->clt, (char *)&data, 1);
 124         if (rc < 0)
 125                 return rc;
 126         return data;
 127 }
 128
 129 static struct i2c_driver thermostat_driver;
 130
 131 static int
 132 attach_thermostat(struct i2c_adapter *adapter)
 133 {
 134         unsigned long bus_no;
 135         struct i2c_board_info info;
 136         struct i2c_client *client;
 137
 138         if (strncmp(adapter->name, "uni-n", 5))
 139                 return -ENODEV;
 140         bus_no = simple_strtoul(adapter->name + 6, NULL, 10);
 141         if (bus_no != therm_bus)
 142                 return -ENODEV;
 143
 144         memset(&info, 0, sizeof(struct i2c_board_info));
 145         strlcpy(info.type, "therm_adt746x", I2C_NAME_SIZE);
 146         info.addr = therm_address;
 147         client = i2c_new_device(adapter, &info);
 148         if (!client)
 149                 return -ENODEV;
 150
 151         /*
 152          * Let i2c-core delete that device on driver removal.
 153          * This is safe because i2c-core holds the core_lock mutex for us.
 154          */
 155         list_add_tail(&client->detected, &thermostat_driver.clients);
 156         return 0;
 157 }
 158
 159 static int
 160 remove_thermostat(struct i2c_client *client)
 161 {
 162         struct thermostat *th = i2c_get_clientdata(client);
 163         int i;
 164
 165         thermostat_remove_files();
 166
 167         if (thread_therm != NULL) {
 168                 kthread_stop(thread_therm);
 169         }
 170
 171         printk(KERN_INFO "adt746x: Putting max temperatures back from "
 172                          "%d, %d, %d to %d, %d, %d\n",
 173                 th->limits[0], th->limits[1], th->limits[2],
 174                 th->initial_limits[0], th->initial_limits[1],
 175                 th->initial_limits[2]);
 176
 177         for (i = 0; i < 3; i++)
 178                 write_reg(th, LIMIT_REG[i], th->initial_limits[i]);
 179
 180         write_both_fan_speed(th, -1);
 181
 182         thermostat = NULL;
 183
 184         kfree(th);
 185
 186         return 0;
 187 }
 188
 189 static int read_fan_speed(struct thermostat *th, u8 addr)
 190 {
 191         u8 tmp[2];
 192         u16 res;
 193
 194         /* should start with low byte */
 195         tmp[1] = read_reg(th, addr);
 196         tmp[0] = read_reg(th, addr + 1);
 197
 198         res = tmp[1] + (tmp[0] << 8);
 199         /* "a value of 0xffff means that the fan has stopped" */
 200         return (res == 0xffff ? 0 : (90000*60)/res);
 201 }
 202
 203 static void write_both_fan_speed(struct thermostat *th, int speed)
 204 {
 205         write_fan_speed(th, speed, 0);
 206         if (therm_type == ADT7460)
 207                 write_fan_speed(th, speed, 1);
 208 }
 209
 210 static void write_fan_speed(struct thermostat *th, int speed, int fan)
 211 {
 212         u8 manual;
 213
 214         if (speed > 0xff)
 215                 speed = 0xff;
 216         else if (speed < -1)
 217                 speed = 0;
 218
 219         if (therm_type == ADT7467 && fan == 1)
 220                 return;
 221
 222         if (th->last_speed[fan] != speed) {
 223                 if (verbose) {
 224                         if (speed == -1)
 225                                 printk(KERN_DEBUG "adt746x: Setting speed to automatic "
 226                                         "for %s fan.\n", sensor_location[fan+1]);
 227                         else
 228                                 printk(KERN_DEBUG "adt746x: Setting speed to %d "
 229                                         "for %s fan.\n", speed, sensor_location[fan+1]);
 230                 }
 231         } else
 232                 return;
 233
 234         if (speed >= 0) {
 235                 manual = read_reg(th, MANUAL_MODE[fan]);
 236                 manual &= ~INVERT_MASK;
 237                 write_reg(th, MANUAL_MODE[fan],
 238                         manual | MANUAL_MASK | th->pwm_inv[fan]);
 239                 write_reg(th, FAN_SPD_SET[fan], speed);
 240         } else {
 241                 /* back to automatic */
 242                 if(therm_type == ADT7460) {
 243                         manual = read_reg(th,
 244                                 MANUAL_MODE[fan]) & (~MANUAL_MASK);
 245                         manual &= ~INVERT_MASK;
 246                         manual |= th->pwm_inv[fan];
 247                         write_reg(th,
 248                                 MANUAL_MODE[fan], manual|REM_CONTROL[fan]);
 249                 } else {
 250                         manual = read_reg(th, MANUAL_MODE[fan]);
 251                         manual &= ~INVERT_MASK;
 252                         manual |= th->pwm_inv[fan];
 253                         write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK));
 254                 }
 255         }
 256
 257         th->last_speed[fan] = speed;
 258 }
 259
 260 static void read_sensors(struct thermostat *th)
 261 {
 262         int i = 0;
 263
 264         for (i = 0; i < 3; i++)
 265                 th->temps[i]  = read_reg(th, TEMP_REG[i]);
 266 }
 267
 268 #ifdef DEBUG
 269 static void display_stats(struct thermostat *th)
 270 {
 271         if (th->temps[0] != th->cached_temp[0]
 272         ||  th->temps[1] != th->cached_temp[1]
 273         ||  th->temps[2] != th->cached_temp[2]) {
 274                 printk(KERN_INFO "adt746x: Temperature infos:"
 275                                  " thermostats: %d,%d,%d;"
 276                                  " limits: %d,%d,%d;"
 277                                  " fan speed: %d RPM\n",
 278                                  th->temps[0], th->temps[1], th->temps[2],
 279                                  th->limits[0],  th->limits[1],  th->limits[2],
 280                                  read_fan_speed(th, FAN_SPEED[0]));
 281         }
 282         th->cached_temp[0] = th->temps[0];
 283         th->cached_temp[1] = th->temps[1];
 284         th->cached_temp[2] = th->temps[2];
 285 }
 286 #endif
 287
 288 static void update_fans_speed (struct thermostat *th)
 289 {
 290         int lastvar = 0; /* last variation, for iBook */
 291         int i = 0;
 292
 293         /* we don't care about local sensor, so we start at sensor 1 */
 294         for (i = 1; i < 3; i++) {
 295                 int started = 0;
 296                 int fan_number = (therm_type == ADT7460 && i == 2);
 297                 int var = th->temps[i] - th->limits[i];
 298
 299                 if (var > -1) {
 300                         int step = (255 - fan_speed) / 7;
 301                         int new_speed = 0;
 302
 303                         /* hysteresis : change fan speed only if variation is
 304                          * more than two degrees */
 305                         if (abs(var - th->last_var[fan_number]) < 2)
 306                                 continue;
 307
 308                         started = 1;
 309                         new_speed = fan_speed + ((var-1)*step);
 310
 311                         if (new_speed < fan_speed)
 312                                 new_speed = fan_speed;
 313                         if (new_speed > 255)
 314                                 new_speed = 255;
 315
 316                         if (verbose)
 317                                 printk(KERN_DEBUG "adt746x: Setting fans speed to %d "
 318                                                  "(limit exceeded by %d on %s)\n",
 319                                                 new_speed, var,
 320                                                 sensor_location[fan_number+1]);
 321                         write_both_fan_speed(th, new_speed);
 322                         th->last_var[fan_number] = var;
 323                 } else if (var < -2) {
 324                         /* don't stop fan if sensor2 is cold and sensor1 is not
 325                          * so cold (lastvar >= -1) */
 326                         if (i == 2 && lastvar < -1) {
 327                                 if (th->last_speed[fan_number] != 0)
 328                                         if (verbose)
 329                                                 printk(KERN_DEBUG "adt746x: Stopping "
 330                                                         "fans.\n");
 331                                 write_both_fan_speed(th, 0);
 332                         }
 333                 }
 334
 335                 lastvar = var;
 336
 337                 if (started)
 338                         return; /* we don't want to re-stop the fan
 339                                 * if sensor1 is heating and sensor2 is not */
 340         }
 341 }
 342
 343 static int monitor_task(void *arg)
 344 {
 345         struct thermostat* th = arg;
 346
 347         set_freezable();
 348         while(!kthread_should_stop()) {
 349                 try_to_freeze();
 350                 msleep_interruptible(2000);
 351
 352 #ifndef DEBUG
 353                 if (fan_speed != -1)
 354                         read_sensors(th);
 355 #else
 356                 read_sensors(th);
 357 #endif
 358
 359                 if (fan_speed != -1)
 360                         update_fans_speed(th);
 361
 362 #ifdef DEBUG
 363                 display_stats(th);
 364 #endif
 365
 366         }
 367
 368         return 0;
 369 }
 370
 371 static void set_limit(struct thermostat *th, int i)
 372 {
 373                 /* Set sensor1 limit higher to avoid powerdowns */
 374                 th->limits[i] = default_limits_chip[i] + limit_adjust;
 375                 write_reg(th, LIMIT_REG[i], th->limits[i]);
 376
 377                 /* set our limits to normal */
 378                 th->limits[i] = default_limits_local[i] + limit_adjust;
 379 }
 380
 381 static int probe_thermostat(struct i2c_client *client,
 382                             const struct i2c_device_id *id)
 383 {
 384         struct thermostat* th;
 385         int rc;
 386         int i;
 387
 388         if (thermostat)
 389                 return 0;
 390
 391         th = kzalloc(sizeof(struct thermostat), GFP_KERNEL);
 392         if (!th)
 393                 return -ENOMEM;
 394
 395         i2c_set_clientdata(client, th);
 396         th->clt = client;
 397
 398         rc = read_reg(th, CONFIG_REG);
 399         if (rc < 0) {
 400                 dev_err(&client->dev, "Thermostat failed to read config!\n");
 401                 kfree(th);
 402                 return -ENODEV;
 403         }
 404
 405         /* force manual control to start the fan quieter */
 406         if (fan_speed == -1)
 407                 fan_speed = 64;
 408
 409         if(therm_type == ADT7460) {
 410                 printk(KERN_INFO "adt746x: ADT7460 initializing\n");
 411                 /* The 7460 needs to be started explicitly */
 412                 write_reg(th, CONFIG_REG, 1);
 413         } else
 414                 printk(KERN_INFO "adt746x: ADT7467 initializing\n");
 415
 416         for (i = 0; i < 3; i++) {
 417                 th->initial_limits[i] = read_reg(th, LIMIT_REG[i]);
 418                 set_limit(th, i);
 419         }
 420
 421         printk(KERN_INFO "adt746x: Lowering max temperatures from %d, %d, %d"
 422                          " to %d, %d, %d\n",
 423                          th->initial_limits[0], th->initial_limits[1],
 424                          th->initial_limits[2], th->limits[0], th->limits[1],
 425                          th->limits[2]);
 426
 427         thermostat = th;
 428
 429         /* record invert bit status because fw can corrupt it after suspend */
 430         th->pwm_inv[0] = read_reg(th, MANUAL_MODE[0]) & INVERT_MASK;
 431         th->pwm_inv[1] = read_reg(th, MANUAL_MODE[1]) & INVERT_MASK;
 432
 433         /* be sure to really write fan speed the first time */
 434         th->last_speed[0] = -2;
 435         th->last_speed[1] = -2;
 436         th->last_var[0] = -80;
 437         th->last_var[1] = -80;
 438
 439         if (fan_speed != -1) {
 440                 /* manual mode, stop fans */
 441                 write_both_fan_speed(th, 0);
 442         } else {
 443                 /* automatic mode */
 444                 write_both_fan_speed(th, -1);
 445         }
 446
 447         thread_therm = kthread_run(monitor_task, th, "kfand");
 448
 449         if (thread_therm == ERR_PTR(-ENOMEM)) {
 450                 printk(KERN_INFO "adt746x: Kthread creation failed\n");
 451                 thread_therm = NULL;
 452                 return -ENOMEM;
 453         }
 454
 455         thermostat_create_files();
 456
 457         return 0;
 458 }
 459
 460 static const struct i2c_device_id therm_adt746x_id[] = {
 461         { "therm_adt746x", 0 },
 462         { }
 463 };
 464
 465 static struct i2c_driver thermostat_driver = {
 466         .driver = {
 467                 .name   = "therm_adt746x",
 468         },
 469         .attach_adapter = attach_thermostat,
 470         .probe = probe_thermostat,
 471         .remove = remove_thermostat,
 472         .id_table = therm_adt746x_id,
 473 };
 474
 475 /*
 476  * Now, unfortunately, sysfs doesn't give us a nice void * we could
 477  * pass around to the attribute functions, so we don't really have
 478  * choice but implement a bunch of them...
 479  *
 480  * FIXME, it does now...
 481  */
 482 #define BUILD_SHOW_FUNC_INT(name, data)                         \
 483 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)        \
 484 {                                                               \
 485         return sprintf(buf, "%d\n", data);                      \
 486 }
 487
 488 #define BUILD_SHOW_FUNC_STR(name, data)                         \
 489 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)       \
 490 {                                                               \
 491         return sprintf(buf, "%s\n", data);                      \
 492 }
 493
 494 #define BUILD_SHOW_FUNC_FAN(name, data)                         \
 495 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)       \
 496 {                                                               \
 497         return sprintf(buf, "%d (%d rpm)\n",                    \
 498                 thermostat->last_speed[data],                   \
 499                 read_fan_speed(thermostat, FAN_SPEED[data])     \
 500                 );                                              \
 501 }
 502
 503 #define BUILD_STORE_FUNC_DEG(name, data)                        \
 504 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
 505 {                                                               \
 506         int val;                                                \
 507         int i;                                                  \
 508         val = simple_strtol(buf, NULL, 10);                     \
 509         printk(KERN_INFO "Adjusting limits by %d degrees\n", val);      \
 510         limit_adjust = val;                                     \
 511         for (i=0; i < 3; i++)                                   \
 512                 set_limit(thermostat, i);                       \
 513         return n;                                               \
 514 }
 515
 516 #define BUILD_STORE_FUNC_INT(name, data)                        \
 517 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
 518 {                                                               \
 519         int val;                                                \
 520         val = simple_strtol(buf, NULL, 10);                     \
 521         if (val < 0 || val > 255)                               \
 522                 return -EINVAL;                                 \
 523         printk(KERN_INFO "Setting specified fan speed to %d\n", val);   \
 524         data = val;                                             \
 525         return n;                                               \
 526 }
 527
 528 BUILD_SHOW_FUNC_INT(sensor1_temperature,         (read_reg(thermostat, TEMP_REG[1])))
 529 BUILD_SHOW_FUNC_INT(sensor2_temperature,         (read_reg(thermostat, TEMP_REG[2])))
 530 BUILD_SHOW_FUNC_INT(sensor1_limit,               thermostat->limits[1])
 531 BUILD_SHOW_FUNC_INT(sensor2_limit,               thermostat->limits[2])
 532 BUILD_SHOW_FUNC_STR(sensor1_location,            sensor_location[1])
 533 BUILD_SHOW_FUNC_STR(sensor2_location,            sensor_location[2])
 534
 535 BUILD_SHOW_FUNC_INT(specified_fan_speed, fan_speed)
 536 BUILD_SHOW_FUNC_FAN(sensor1_fan_speed,   0)
 537 BUILD_SHOW_FUNC_FAN(sensor2_fan_speed,   1)
 538
 539 BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed)
 540 BUILD_SHOW_FUNC_INT(limit_adjust,        limit_adjust)
 541 BUILD_STORE_FUNC_DEG(limit_adjust,       thermostat)
 542
 543 static DEVICE_ATTR(sensor1_temperature, S_IRUGO,
 544                    show_sensor1_temperature,NULL);
 545 static DEVICE_ATTR(sensor2_temperature, S_IRUGO,
 546                    show_sensor2_temperature,NULL);
 547 static DEVICE_ATTR(sensor1_limit, S_IRUGO,
 548                    show_sensor1_limit,  NULL);
 549 static DEVICE_ATTR(sensor2_limit, S_IRUGO,
 550                    show_sensor2_limit,  NULL);
 551 static DEVICE_ATTR(sensor1_location, S_IRUGO,
 552                    show_sensor1_location, NULL);
 553 static DEVICE_ATTR(sensor2_location, S_IRUGO,
 554                    show_sensor2_location, NULL);
 555
 556 static DEVICE_ATTR(specified_fan_speed, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 557                    show_specified_fan_speed,store_specified_fan_speed);
 558
 559 static DEVICE_ATTR(sensor1_fan_speed,   S_IRUGO,
 560                    show_sensor1_fan_speed,      NULL);
 561 static DEVICE_ATTR(sensor2_fan_speed,   S_IRUGO,
 562                    show_sensor2_fan_speed,      NULL);
 563
 564 static DEVICE_ATTR(limit_adjust,        S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 565                    show_limit_adjust,   store_limit_adjust);
 566
 567
 568 static int __init
 569 thermostat_init(void)
 570 {
 571         struct device_node* np;
 572         const u32 *prop;
 573         int i = 0, offset = 0;
 574
 575         np = of_find_node_by_name(NULL, "fan");
 576         if (!np)
 577                 return -ENODEV;
 578         if (of_device_is_compatible(np, "adt7460"))
 579                 therm_type = ADT7460;
 580         else if (of_device_is_compatible(np, "adt7467"))
 581                 therm_type = ADT7467;
 582         else {
 583                 of_node_put(np);
 584                 return -ENODEV;
 585         }
 586
 587         prop = of_get_property(np, "hwsensor-params-version", NULL);
 588         printk(KERN_INFO "adt746x: version %d (%ssupported)\n", *prop,
 589                          (*prop == 1)?"":"un");
 590         if (*prop != 1) {
 591                 of_node_put(np);
 592                 return -ENODEV;
 593         }
 594
 595         prop = of_get_property(np, "reg", NULL);
 596         if (!prop) {
 597                 of_node_put(np);
 598                 return -ENODEV;
 599         }
 600
 601         /* look for bus either by path or using "reg" */
 602         if (strstr(np->full_name, "/i2c-bus@") != NULL) {
 603                 const char *tmp_bus = (strstr(np->full_name, "/i2c-bus@") + 9);
 604                 therm_bus = tmp_bus[0]-'0';
 605         } else {
 606                 therm_bus = ((*prop) >> 8) & 0x0f;
 607         }
 608
 609         therm_address = ((*prop) & 0xff) >> 1;
 610
 611         printk(KERN_INFO "adt746x: Thermostat bus: %d, address: 0x%02x, "
 612                          "limit_adjust: %d, fan_speed: %d\n",
 613                          therm_bus, therm_address, limit_adjust, fan_speed);
 614
 615         if (of_get_property(np, "hwsensor-location", NULL)) {
 616                 for (i = 0; i < 3; i++) {
 617                         sensor_location[i] = of_get_property(np,
 618                                         "hwsensor-location", NULL) + offset;
 619
 620                         if (sensor_location[i] == NULL)
 621                                 sensor_location[i] = "";
 622
 623                         printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]);
 624                         offset += strlen(sensor_location[i]) + 1;
 625                 }
 626         } else {
 627                 sensor_location[0] = "?";
 628                 sensor_location[1] = "?";
 629                 sensor_location[2] = "?";
 630         }
 631
 632         of_dev = of_platform_device_create(np, "temperatures", NULL);
 633         of_node_put(np);
 634
 635         if (of_dev == NULL) {
 636                 printk(KERN_ERR "Can't register temperatures device !\n");
 637                 return -ENODEV;
 638         }
 639
 640 #ifndef CONFIG_I2C_POWERMAC
 641         request_module("i2c-powermac");
 642 #endif
 643
 644         return i2c_add_driver(&thermostat_driver);
 645 }
 646
 647 static void thermostat_create_files(void)
 648 {
 649         int err;
 650
 651         err = device_create_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 652         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 653         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_limit);
 654         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_limit);
 655         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_location);
 656         err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_location);
 657         err |= device_create_file(&of_dev->dev, &dev_attr_limit_adjust);
 658         err |= device_create_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 659         err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 660         if(therm_type == ADT7460)
 661                 err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_fan_speed);
 662         if (err)
 663                 printk(KERN_WARNING
 664                         "Failed to create temperature attribute file(s).\n");
 665 }
 666
 667 static void thermostat_remove_files(void)
 668 {
 669         if (of_dev) {
 670                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_temperature);
 671                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_temperature);
 672                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_limit);
 673                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_limit);
 674                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_location);
 675                 device_remove_file(&of_dev->dev, &dev_attr_sensor2_location);
 676                 device_remove_file(&of_dev->dev, &dev_attr_limit_adjust);
 677                 device_remove_file(&of_dev->dev, &dev_attr_specified_fan_speed);
 678                 device_remove_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
 679
 680                 if(therm_type == ADT7460)
 681                         device_remove_file(&of_dev->dev,
 682                                            &dev_attr_sensor2_fan_speed);
 683
 684         }
 685 }
 686
 687 static void __exit
 688 thermostat_exit(void)
 689 {
 690         i2c_del_driver(&thermostat_driver);
 691         of_device_unregister(of_dev);
 692 }
 693
 694 module_init(thermostat_init);
 695 module_exit(thermostat_exit);