drivers/platform/x86/acerhdf.c

   1 /*
   2  * acerhdf - A driver which monitors the temperature
   3  *           of the aspire one netbook, turns on/off the fan
   4  *           as soon as the upper/lower threshold is reached.
   5  *
   6  * (C) 2009 - Peter Feuerer     peter (a) piie.net
   7  *                              http://piie.net
   8  *     2009 Borislav Petkov <petkovbb@gmail.com>
   9  *
  10  * Inspired by and many thanks to:
  11  *  o acerfand   - Rachel Greenham
  12  *  o acer_ec.pl - Michael Kurz     michi.kurz (at) googlemail.com
  13  *               - Petr Tomasek     tomasek (#) etf,cuni,cz
  14  *               - Carlos Corbacho  cathectic (at) gmail.com
  15  *  o lkml       - Matthew Garrett
  16  *               - Borislav Petkov
  17  *               - Andreas Mohr
  18  *
  19  *  This program is free software; you can redistribute it and/or modify
  20  *  it under the terms of the GNU General Public License as published by
  21  *  the Free Software Foundation; either version 2 of the License, or
  22  *  (at your option) any later version.
  23  *
  24  *  This program is distributed in the hope that it will be useful,
  25  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  *  GNU General Public License for more details.
  28  *
  29  *  You should have received a copy of the GNU General Public License
  30  *  along with this program; if not, write to the Free Software
  31  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  32  */
  33
  34 #define pr_fmt(fmt) "acerhdf: " fmt
  35
  36 #include <linux/kernel.h>
  37 #include <linux/module.h>
  38 #include <linux/fs.h>
  39 #include <linux/dmi.h>
  40 #include <acpi/acpi_drivers.h>
  41 #include <linux/sched.h>
  42 #include <linux/thermal.h>
  43 #include <linux/platform_device.h>
  44
  45 /*
  46  * The driver is started with "kernel mode off" by default. That means, the BIOS
  47  * is still in control of the fan. In this mode the driver allows to read the
  48  * temperature of the cpu and a userspace tool may take over control of the fan.
  49  * If the driver is switched to "kernel mode" (e.g. via module parameter) the
  50  * driver is in full control of the fan. If you want the module to be started in
  51  * kernel mode by default, define the following:
  52  */
  53 #undef START_IN_KERNEL_MODE
  54
  55 #define DRV_VER "0.5.22"
  56
  57 /*
  58  * According to the Atom N270 datasheet,
  59  * (http://download.intel.com/design/processor/datashts/320032.pdf) the
  60  * CPU's optimal operating limits denoted in junction temperature as
  61  * measured by the on-die thermal monitor are within 0 <= Tj <= 90. So,
  62  * assume 89°C is critical temperature.
  63  */
  64 #define ACERHDF_TEMP_CRIT 89000
  65 #define ACERHDF_FAN_OFF 0
  66 #define ACERHDF_FAN_AUTO 1
  67
  68 /*
  69  * No matter what value the user puts into the fanon variable, turn on the fan
  70  * at 80 degree Celsius to prevent hardware damage
  71  */
  72 #define ACERHDF_MAX_FANON 80000
  73
  74 /*
  75  * Maximum interval between two temperature checks is 15 seconds, as the die
  76  * can get hot really fast under heavy load (plus we shouldn't forget about
  77  * possible impact of _external_ aggressive sources such as heaters, sun etc.)
  78  */
  79 #define ACERHDF_MAX_INTERVAL 15
  80
  81 #ifdef START_IN_KERNEL_MODE
  82 static int kernelmode = 1;
  83 #else
  84 static int kernelmode;
  85 #endif
  86
  87 static unsigned int interval = 10;
  88 static unsigned int fanon = 63000;
  89 static unsigned int fanoff = 58000;
  90 static unsigned int verbose;
  91 static unsigned int fanstate = ACERHDF_FAN_AUTO;
  92 static char force_bios[16];
  93 static char force_product[16];
  94 static unsigned int prev_interval;
  95 struct thermal_zone_device *thz_dev;
  96 struct thermal_cooling_device *cl_dev;
  97 struct platform_device *acerhdf_dev;
  98
  99 module_param(kernelmode, uint, 0);
 100 MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off");
 101 module_param(interval, uint, 0600);
 102 MODULE_PARM_DESC(interval, "Polling interval of temperature check");
 103 module_param(fanon, uint, 0600);
 104 MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature");
 105 module_param(fanoff, uint, 0600);
 106 MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature");
 107 module_param(verbose, uint, 0600);
 108 MODULE_PARM_DESC(verbose, "Enable verbose dmesg output");
 109 module_param_string(force_bios, force_bios, 16, 0);
 110 MODULE_PARM_DESC(force_bios, "Force BIOS version and omit BIOS check");
 111 module_param_string(force_product, force_product, 16, 0);
 112 MODULE_PARM_DESC(force_product, "Force BIOS product and omit BIOS check");
 113
 114 /*
 115  * cmd_off: to switch the fan completely off
 116  * chk_off: to check if the fan is off
 117  *      cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then
 118  *              the fan speed depending on the temperature
 119  */
 120 struct fancmd {
 121         u8 cmd_off;
 122         u8 chk_off;
 123         u8 cmd_auto;
 124 };
 125
 126 /* BIOS settings */
 127 struct bios_settings_t {
 128         const char *vendor;
 129         const char *product;
 130         const char *version;
 131         unsigned char fanreg;
 132         unsigned char tempreg;
 133         struct fancmd cmd;
 134 };
 135
 136 /* Register addresses and values for different BIOS versions */
 137 static const struct bios_settings_t bios_tbl[] = {
 138         /* AOA110 */
 139         {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x1f, 0x00} },
 140         {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x1f, 0x00} },
 141         {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0xaf, 0x00} },
 142         {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0xaf, 0x00} },
 143         {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0xaf, 0x00} },
 144         {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0xaf, 0x00} },
 145         {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x21, 0x00} },
 146         {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x21, 0x00} },
 147         {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x21, 0x00} },
 148         /* AOA150 */
 149         {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x20, 0x20, 0x00} },
 150         {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x20, 0x00} },
 151         {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x20, 0x00} },
 152         {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x20, 0x00} },
 153         {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x20, 0x00} },
 154         {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x20, 0x00} },
 155         {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x20, 0x00} },
 156         {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x20, 0x00} },
 157         /* Acer 1410 */
 158         {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x9e, 0x00} },
 159         {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x9e, 0x00} },
 160         /* Acer 1810xx */
 161         {"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x9e, 0x00} },
 162         {"Acer", "Aspire 1810T", "v0.3120", 0x55, 0x58, {0x9e, 0x9e, 0x00} },
 163         {"Acer", "Aspire 1810T", "v1.3303", 0x55, 0x58, {0x9e, 0x9e, 0x00} },
 164         {"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x9e, 0x00} },
 165         /* Gateway */
 166         {"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x21, 0x00} },
 167         {"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x20, 0x00} },
 168         {"Gateway", "LT31", "v1.3103", 0x55, 0x58, {0x10, 0x0f, 0x00} },
 169         {"Gateway", "LT31", "v1.3201", 0x55, 0x58, {0x10, 0x0f, 0x00} },
 170         {"Gateway", "LT31", "v1.3302", 0x55, 0x58, {0x10, 0x0f, 0x00} },
 171         /* Packard Bell */
 172         {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x21, 0x00} },
 173         {"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x20, 0x00} },
 174         {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x21, 0x00} },
 175         {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x20, 0x00} },
 176         {"Packard Bell", "DOTMU", "v1.3303", 0x55, 0x58, {0x9e, 0x9e, 0x00} },
 177         {"Packard Bell", "DOTMU", "v0.3120", 0x55, 0x58, {0x9e, 0x9e, 0x00} },
 178         /* pewpew-terminator */
 179         {"", "", "", 0, 0, {0, 0, 0} }
 180 };
 181
 182 static const struct bios_settings_t *bios_cfg __read_mostly;
 183
 184 static int acerhdf_get_temp(int *temp)
 185 {
 186         u8 read_temp;
 187
 188         if (ec_read(bios_cfg->tempreg, &read_temp))
 189                 return -EINVAL;
 190
 191         *temp = read_temp * 1000;
 192
 193         return 0;
 194 }
 195
 196 static int acerhdf_get_fanstate(int *state)
 197 {
 198         u8 fan;
 199
 200         if (ec_read(bios_cfg->fanreg, &fan))
 201                 return -EINVAL;
 202
 203         if (fan != bios_cfg->cmd.chk_off)
 204                 *state = ACERHDF_FAN_AUTO;
 205         else
 206                 *state = ACERHDF_FAN_OFF;
 207
 208         return 0;
 209 }
 210
 211 static void acerhdf_change_fanstate(int state)
 212 {
 213         unsigned char cmd;
 214
 215         if (verbose)
 216                 pr_notice("fan %s\n", (state == ACERHDF_FAN_OFF) ?
 217                                 "OFF" : "ON");
 218
 219         if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
 220                 pr_err("invalid fan state %d requested, setting to auto!\n",
 221                         state);
 222                 state = ACERHDF_FAN_AUTO;
 223         }
 224
 225         cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off
 226                                          : bios_cfg->cmd.cmd_auto;
 227         fanstate = state;
 228
 229         ec_write(bios_cfg->fanreg, cmd);
 230 }
 231
 232 static void acerhdf_check_param(struct thermal_zone_device *thermal)
 233 {
 234         if (fanon > ACERHDF_MAX_FANON) {
 235                 pr_err("fanon temperature too high, set to %d\n",
 236                                 ACERHDF_MAX_FANON);
 237                 fanon = ACERHDF_MAX_FANON;
 238         }
 239
 240         if (kernelmode && prev_interval != interval) {
 241                 if (interval > ACERHDF_MAX_INTERVAL) {
 242                         pr_err("interval too high, set to %d\n",
 243                                 ACERHDF_MAX_INTERVAL);
 244                         interval = ACERHDF_MAX_INTERVAL;
 245                 }
 246                 if (verbose)
 247                         pr_notice("interval changed to: %d\n",
 248                                         interval);
 249                 thermal->polling_delay = interval*1000;
 250                 prev_interval = interval;
 251         }
 252 }
 253
 254 /*
 255  * This is the thermal zone callback which does the delayed polling of the fan
 256  * state. We do check /sysfs-originating settings here in acerhdf_check_param()
 257  * as late as the polling interval is since we can't do that in the respective
 258  * accessors of the module parameters.
 259  */
 260 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal,
 261                                unsigned long *t)
 262 {
 263         int temp, err = 0;
 264
 265         acerhdf_check_param(thermal);
 266
 267         err = acerhdf_get_temp(&temp);
 268         if (err)
 269                 return err;
 270
 271         if (verbose)
 272                 pr_notice("temp %d\n", temp);
 273
 274         *t = temp;
 275         return 0;
 276 }
 277
 278 static int acerhdf_bind(struct thermal_zone_device *thermal,
 279                         struct thermal_cooling_device *cdev)
 280 {
 281         /* if the cooling device is the one from acerhdf bind it */
 282         if (cdev != cl_dev)
 283                 return 0;
 284
 285         if (thermal_zone_bind_cooling_device(thermal, 0, cdev)) {
 286                 pr_err("error binding cooling dev\n");
 287                 return -EINVAL;
 288         }
 289         return 0;
 290 }
 291
 292 static int acerhdf_unbind(struct thermal_zone_device *thermal,
 293                           struct thermal_cooling_device *cdev)
 294 {
 295         if (cdev != cl_dev)
 296                 return 0;
 297
 298         if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
 299                 pr_err("error unbinding cooling dev\n");
 300                 return -EINVAL;
 301         }
 302         return 0;
 303 }
 304
 305 static inline void acerhdf_revert_to_bios_mode(void)
 306 {
 307         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 308         kernelmode = 0;
 309         if (thz_dev)
 310                 thz_dev->polling_delay = 0;
 311         pr_notice("kernel mode fan control OFF\n");
 312 }
 313 static inline void acerhdf_enable_kernelmode(void)
 314 {
 315         kernelmode = 1;
 316
 317         thz_dev->polling_delay = interval*1000;
 318         thermal_zone_device_update(thz_dev);
 319         pr_notice("kernel mode fan control ON\n");
 320 }
 321
 322 static int acerhdf_get_mode(struct thermal_zone_device *thermal,
 323                             enum thermal_device_mode *mode)
 324 {
 325         if (verbose)
 326                 pr_notice("kernel mode fan control %d\n", kernelmode);
 327
 328         *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED
 329                              : THERMAL_DEVICE_DISABLED;
 330
 331         return 0;
 332 }
 333
 334 /*
 335  * set operation mode;
 336  * enabled: the thermal layer of the kernel takes care about
 337  *          the temperature and the fan.
 338  * disabled: the BIOS takes control of the fan.
 339  */
 340 static int acerhdf_set_mode(struct thermal_zone_device *thermal,
 341                             enum thermal_device_mode mode)
 342 {
 343         if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
 344                 acerhdf_revert_to_bios_mode();
 345         else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
 346                 acerhdf_enable_kernelmode();
 347
 348         return 0;
 349 }
 350
 351 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
 352                                  enum thermal_trip_type *type)
 353 {
 354         if (trip == 0)
 355                 *type = THERMAL_TRIP_ACTIVE;
 356
 357         return 0;
 358 }
 359
 360 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
 361                                  unsigned long *temp)
 362 {
 363         if (trip == 0)
 364                 *temp = fanon;
 365
 366         return 0;
 367 }
 368
 369 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
 370                                  unsigned long *temperature)
 371 {
 372         *temperature = ACERHDF_TEMP_CRIT;
 373         return 0;
 374 }
 375
 376 /* bind callback functions to thermalzone */
 377 struct thermal_zone_device_ops acerhdf_dev_ops = {
 378         .bind = acerhdf_bind,
 379         .unbind = acerhdf_unbind,
 380         .get_temp = acerhdf_get_ec_temp,
 381         .get_mode = acerhdf_get_mode,
 382         .set_mode = acerhdf_set_mode,
 383         .get_trip_type = acerhdf_get_trip_type,
 384         .get_trip_temp = acerhdf_get_trip_temp,
 385         .get_crit_temp = acerhdf_get_crit_temp,
 386 };
 387
 388
 389 /*
 390  * cooling device callback functions
 391  * get maximal fan cooling state
 392  */
 393 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
 394                                  unsigned long *state)
 395 {
 396         *state = 1;
 397
 398         return 0;
 399 }
 400
 401 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
 402                                  unsigned long *state)
 403 {
 404         int err = 0, tmp;
 405
 406         err = acerhdf_get_fanstate(&tmp);
 407         if (err)
 408                 return err;
 409
 410         *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
 411         return 0;
 412 }
 413
 414 /* change current fan state - is overwritten when running in kernel mode */
 415 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
 416                                  unsigned long state)
 417 {
 418         int cur_temp, cur_state, err = 0;
 419
 420         if (!kernelmode)
 421                 return 0;
 422
 423         err = acerhdf_get_temp(&cur_temp);
 424         if (err) {
 425                 pr_err("error reading temperature, hand off control to BIOS\n");
 426                 goto err_out;
 427         }
 428
 429         err = acerhdf_get_fanstate(&cur_state);
 430         if (err) {
 431                 pr_err("error reading fan state, hand off control to BIOS\n");
 432                 goto err_out;
 433         }
 434
 435         if (state == 0) {
 436                 /* turn fan off only if below fanoff temperature */
 437                 if ((cur_state == ACERHDF_FAN_AUTO) &&
 438                     (cur_temp < fanoff))
 439                         acerhdf_change_fanstate(ACERHDF_FAN_OFF);
 440         } else {
 441                 if (cur_state == ACERHDF_FAN_OFF)
 442                         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 443         }
 444         return 0;
 445
 446 err_out:
 447         acerhdf_revert_to_bios_mode();
 448         return -EINVAL;
 449 }
 450
 451 /* bind fan callbacks to fan device */
 452 struct thermal_cooling_device_ops acerhdf_cooling_ops = {
 453         .get_max_state = acerhdf_get_max_state,
 454         .get_cur_state = acerhdf_get_cur_state,
 455         .set_cur_state = acerhdf_set_cur_state,
 456 };
 457
 458 /* suspend / resume functionality */
 459 static int acerhdf_suspend(struct device *dev)
 460 {
 461         if (kernelmode)
 462                 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 463
 464         if (verbose)
 465                 pr_notice("going suspend\n");
 466
 467         return 0;
 468 }
 469
 470 static int __devinit acerhdf_probe(struct platform_device *device)
 471 {
 472         return 0;
 473 }
 474
 475 static int acerhdf_remove(struct platform_device *device)
 476 {
 477         return 0;
 478 }
 479
 480 static const struct dev_pm_ops acerhdf_pm_ops = {
 481         .suspend = acerhdf_suspend,
 482         .freeze  = acerhdf_suspend,
 483 };
 484
 485 static struct platform_driver acerhdf_driver = {
 486         .driver = {
 487                 .name  = "acerhdf",
 488                 .owner = THIS_MODULE,
 489                 .pm    = &acerhdf_pm_ops,
 490         },
 491         .probe = acerhdf_probe,
 492         .remove = acerhdf_remove,
 493 };
 494
 495 /* checks if str begins with start */
 496 static int str_starts_with(const char *str, const char *start)
 497 {
 498         unsigned long str_len = 0, start_len = 0;
 499
 500         str_len = strlen(str);
 501         start_len = strlen(start);
 502
 503         if (str_len >= start_len &&
 504                         !strncmp(str, start, start_len))
 505                 return 1;
 506
 507         return 0;
 508 }
 509
 510 /* check hardware */
 511 static int acerhdf_check_hardware(void)
 512 {
 513         char const *vendor, *version, *product;
 514         const struct bios_settings_t *bt = NULL;
 515
 516         /* get BIOS data */
 517         vendor  = dmi_get_system_info(DMI_SYS_VENDOR);
 518         version = dmi_get_system_info(DMI_BIOS_VERSION);
 519         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 520
 521
 522         pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
 523
 524         if (force_bios[0]) {
 525                 version = force_bios;
 526                 pr_info("forcing BIOS version: %s\n", version);
 527                 kernelmode = 0;
 528         }
 529
 530         if (force_product[0]) {
 531                 product = force_product;
 532                 pr_info("forcing BIOS product: %s\n", product);
 533                 kernelmode = 0;
 534         }
 535
 536         if (verbose)
 537                 pr_info("BIOS info: %s %s, product: %s\n",
 538                         vendor, version, product);
 539
 540         /* search BIOS version and vendor in BIOS settings table */
 541         for (bt = bios_tbl; bt->vendor[0]; bt++) {
 542                 /*
 543                  * check if actual hardware BIOS vendor, product and version
 544                  * IDs start with the strings of BIOS table entry
 545                  */
 546                 if (str_starts_with(vendor, bt->vendor) &&
 547                                 str_starts_with(product, bt->product) &&
 548                                 str_starts_with(version, bt->version)) {
 549                         bios_cfg = bt;
 550                         break;
 551                 }
 552         }
 553
 554         if (!bios_cfg) {
 555                 pr_err("unknown (unsupported) BIOS version %s/%s/%s, "
 556                         "please report, aborting!\n", vendor, product, version);
 557                 return -EINVAL;
 558         }
 559
 560         /*
 561          * if started with kernel mode off, prevent the kernel from switching
 562          * off the fan
 563          */
 564         if (!kernelmode) {
 565                 pr_notice("Fan control off, to enable do:\n");
 566                 pr_notice("echo -n \"enabled\" > "
 567                         "/sys/class/thermal/thermal_zone0/mode\n");
 568         }
 569
 570         return 0;
 571 }
 572
 573 static int acerhdf_register_platform(void)
 574 {
 575         int err = 0;
 576
 577         err = platform_driver_register(&acerhdf_driver);
 578         if (err)
 579                 return err;
 580
 581         acerhdf_dev = platform_device_alloc("acerhdf", -1);
 582         platform_device_add(acerhdf_dev);
 583
 584         return 0;
 585 }
 586
 587 static void acerhdf_unregister_platform(void)
 588 {
 589         if (!acerhdf_dev)
 590                 return;
 591
 592         platform_device_del(acerhdf_dev);
 593         platform_driver_unregister(&acerhdf_driver);
 594 }
 595
 596 static int acerhdf_register_thermal(void)
 597 {
 598         cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
 599                                                  &acerhdf_cooling_ops);
 600
 601         if (IS_ERR(cl_dev))
 602                 return -EINVAL;
 603
 604         thz_dev = thermal_zone_device_register("acerhdf", 1, NULL,
 605                                               &acerhdf_dev_ops, 0, 0, 0,
 606                                               (kernelmode) ? interval*1000 : 0);
 607         if (IS_ERR(thz_dev))
 608                 return -EINVAL;
 609
 610         return 0;
 611 }
 612
 613 static void acerhdf_unregister_thermal(void)
 614 {
 615         if (cl_dev) {
 616                 thermal_cooling_device_unregister(cl_dev);
 617                 cl_dev = NULL;
 618         }
 619
 620         if (thz_dev) {
 621                 thermal_zone_device_unregister(thz_dev);
 622                 thz_dev = NULL;
 623         }
 624 }
 625
 626 static int __init acerhdf_init(void)
 627 {
 628         int err = 0;
 629
 630         err = acerhdf_check_hardware();
 631         if (err)
 632                 goto out_err;
 633
 634         err = acerhdf_register_platform();
 635         if (err)
 636                 goto err_unreg;
 637
 638         err = acerhdf_register_thermal();
 639         if (err)
 640                 goto err_unreg;
 641
 642         return 0;
 643
 644 err_unreg:
 645         acerhdf_unregister_thermal();
 646         acerhdf_unregister_platform();
 647
 648 out_err:
 649         return -ENODEV;
 650 }
 651
 652 static void __exit acerhdf_exit(void)
 653 {
 654         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 655         acerhdf_unregister_thermal();
 656         acerhdf_unregister_platform();
 657 }
 658
 659 MODULE_LICENSE("GPL");
 660 MODULE_AUTHOR("Peter Feuerer");
 661 MODULE_DESCRIPTION("Aspire One temperature and fan driver");
 662 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
 663 MODULE_ALIAS("dmi:*:*Acer*:pnAspire 1410*:");
 664 MODULE_ALIAS("dmi:*:*Acer*:pnAspire 1810*:");
 665 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
 666 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
 667 MODULE_ALIAS("dmi:*:*Packard Bell*:pnAOA*:");
 668 MODULE_ALIAS("dmi:*:*Packard Bell*:pnDOA*:");
 669 MODULE_ALIAS("dmi:*:*Packard Bell*:pnDOTMU*:");
 670
 671 module_init(acerhdf_init);
 672 module_exit(acerhdf_exit);