linux/drivers/macintosh/therm_adt746x.c
<<
>>
Prefs
   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
  42static u8 TEMP_REG[3]    = {0x26, 0x25, 0x27}; /* local, sensor1, sensor2 */
  43static u8 LIMIT_REG[3]   = {0x6b, 0x6a, 0x6c}; /* local, sensor1, sensor2 */
  44static u8 MANUAL_MODE[2] = {0x5c, 0x5d};       
  45static u8 REM_CONTROL[2] = {0x00, 0x40};
  46static u8 FAN_SPEED[2]   = {0x28, 0x2a};
  47static u8 FAN_SPD_SET[2] = {0x30, 0x31};
  48
  49static u8 default_limits_local[3] = {70, 50, 70};    /* local, sensor1, sensor2 */
  50static u8 default_limits_chip[3] = {80, 65, 80};    /* local, sensor1, sensor2 */
  51static const char *sensor_location[3];
  52
  53static int limit_adjust;
  54static int fan_speed = -1;
  55static bool verbose;
  56
  57MODULE_AUTHOR("Colin Leroy <colin@colino.net>");
  58MODULE_DESCRIPTION("Driver for ADT746x thermostat in iBook G4 and "
  59                   "Powerbook G4 Alu");
  60MODULE_LICENSE("GPL");
  61
  62module_param(limit_adjust, int, 0644);
  63MODULE_PARM_DESC(limit_adjust,"Adjust maximum temperatures (50 sensor1, 70 sensor2) "
  64                 "by N degrees.");
  65
  66module_param(fan_speed, int, 0644);
  67MODULE_PARM_DESC(fan_speed,"Specify starting fan speed (0-255) "
  68                 "(default 64)");
  69
  70module_param(verbose, bool, 0);
  71MODULE_PARM_DESC(verbose,"Verbose log operations "
  72                 "(default 0)");
  73
  74struct 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
  85static enum {ADT7460, ADT7467} therm_type;
  86static int therm_bus, therm_address;
  87static struct platform_device * of_dev;
  88static struct thermostat* thermostat;
  89static struct task_struct *thread_therm = NULL;
  90
  91static void write_both_fan_speed(struct thermostat *th, int speed);
  92static void write_fan_speed(struct thermostat *th, int speed, int fan);
  93static void thermostat_create_files(void);
  94static void thermostat_remove_files(void);
  95
  96static int
  97write_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
 112static int
 113read_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
 130static struct i2c_driver thermostat_driver;
 131
 132static int
 133attach_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
 160static int
 161remove_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
 190static 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
 204static 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
 211static 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
 261static 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
 270static 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
 289static 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
 344static 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
 372static 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
 382static 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
 461static const struct i2c_device_id therm_adt746x_id[] = {
 462        { "therm_adt746x", 0 },
 463        { }
 464};
 465
 466static 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)                         \
 484static 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)                         \
 490static 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)                         \
 496static 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)                        \
 505static 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)                        \
 518static 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
 529BUILD_SHOW_FUNC_INT(sensor1_temperature,         (read_reg(thermostat, TEMP_REG[1])))
 530BUILD_SHOW_FUNC_INT(sensor2_temperature,         (read_reg(thermostat, TEMP_REG[2])))
 531BUILD_SHOW_FUNC_INT(sensor1_limit,               thermostat->limits[1])
 532BUILD_SHOW_FUNC_INT(sensor2_limit,               thermostat->limits[2])
 533BUILD_SHOW_FUNC_STR(sensor1_location,            sensor_location[1])
 534BUILD_SHOW_FUNC_STR(sensor2_location,            sensor_location[2])
 535
 536BUILD_SHOW_FUNC_INT(specified_fan_speed, fan_speed)
 537BUILD_SHOW_FUNC_FAN(sensor1_fan_speed,   0)
 538BUILD_SHOW_FUNC_FAN(sensor2_fan_speed,   1)
 539
 540BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed)
 541BUILD_SHOW_FUNC_INT(limit_adjust,        limit_adjust)
 542BUILD_STORE_FUNC_DEG(limit_adjust,       thermostat)
 543                
 544static DEVICE_ATTR(sensor1_temperature, S_IRUGO,
 545                   show_sensor1_temperature,NULL);
 546static DEVICE_ATTR(sensor2_temperature, S_IRUGO,
 547                   show_sensor2_temperature,NULL);
 548static DEVICE_ATTR(sensor1_limit, S_IRUGO,
 549                   show_sensor1_limit,  NULL);
 550static DEVICE_ATTR(sensor2_limit, S_IRUGO,
 551                   show_sensor2_limit,  NULL);
 552static DEVICE_ATTR(sensor1_location, S_IRUGO,
 553                   show_sensor1_location, NULL);
 554static DEVICE_ATTR(sensor2_location, S_IRUGO,
 555                   show_sensor2_location, NULL);
 556
 557static DEVICE_ATTR(specified_fan_speed, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 558                   show_specified_fan_speed,store_specified_fan_speed);
 559
 560static DEVICE_ATTR(sensor1_fan_speed,   S_IRUGO,
 561                   show_sensor1_fan_speed,      NULL);
 562static DEVICE_ATTR(sensor2_fan_speed,   S_IRUGO,
 563                   show_sensor2_fan_speed,      NULL);
 564
 565static DEVICE_ATTR(limit_adjust,        S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 566                   show_limit_adjust,   store_limit_adjust);
 567
 568
 569static int __init
 570thermostat_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
 648static 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
 668static 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
 688static void __exit
 689thermostat_exit(void)
 690{
 691        i2c_del_driver(&thermostat_driver);
 692        of_device_unregister(of_dev);
 693}
 694
 695module_init(thermostat_init);
 696module_exit(thermostat_exit);
 697