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 "0.5.20"
  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         /* special BIOS / other */
 160         {"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x21, 0x00} },
 161         {"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x20, 0x00} },
 162         {"Gateway         ", "LT31            ", "v1.3103 ", 0x55, 0x58,
 163                 {0x10, 0x0f, 0x00} },
 164         {"Gateway         ", "LT31            ", "v1.3201 ", 0x55, 0x58,
 165                 {0x10, 0x0f, 0x00} },
 166         {"Gateway         ", "LT31            ", "v1.3302 ", 0x55, 0x58,
 167                 {0x10, 0x0f, 0x00} },
 168         {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x21, 0x00} },
 169         {"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x20, 0x00} },
 170         {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x21, 0x00} },
 171         {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x20, 0x00} },
 172         /* pewpew-terminator */
 173         {"", "", "", 0, 0, {0, 0, 0} }
 174 };
 175
 176 static const struct bios_settings_t *bios_cfg __read_mostly;
 177
 178 static int acerhdf_get_temp(int *temp)
 179 {
 180         u8 read_temp;
 181
 182         if (ec_read(bios_cfg->tempreg, &read_temp))
 183                 return -EINVAL;
 184
 185         *temp = read_temp * 1000;
 186
 187         return 0;
 188 }
 189
 190 static int acerhdf_get_fanstate(int *state)
 191 {
 192         u8 fan;
 193
 194         if (ec_read(bios_cfg->fanreg, &fan))
 195                 return -EINVAL;
 196
 197         if (fan != bios_cfg->cmd.chk_off)
 198                 *state = ACERHDF_FAN_AUTO;
 199         else
 200                 *state = ACERHDF_FAN_OFF;
 201
 202         return 0;
 203 }
 204
 205 static void acerhdf_change_fanstate(int state)
 206 {
 207         unsigned char cmd;
 208
 209         if (verbose)
 210                 pr_notice("fan %s\n", (state == ACERHDF_FAN_OFF) ?
 211                                 "OFF" : "ON");
 212
 213         if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
 214                 pr_err("invalid fan state %d requested, setting to auto!\n",
 215                         state);
 216                 state = ACERHDF_FAN_AUTO;
 217         }
 218
 219         cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off
 220                                          : bios_cfg->cmd.cmd_auto;
 221         fanstate = state;
 222
 223         ec_write(bios_cfg->fanreg, cmd);
 224 }
 225
 226 static void acerhdf_check_param(struct thermal_zone_device *thermal)
 227 {
 228         if (fanon > ACERHDF_MAX_FANON) {
 229                 pr_err("fanon temperature too high, set to %d\n",
 230                                 ACERHDF_MAX_FANON);
 231                 fanon = ACERHDF_MAX_FANON;
 232         }
 233
 234         if (kernelmode && prev_interval != interval) {
 235                 if (interval > ACERHDF_MAX_INTERVAL) {
 236                         pr_err("interval too high, set to %d\n",
 237                                 ACERHDF_MAX_INTERVAL);
 238                         interval = ACERHDF_MAX_INTERVAL;
 239                 }
 240                 if (verbose)
 241                         pr_notice("interval changed to: %d\n",
 242                                         interval);
 243                 thermal->polling_delay = interval*1000;
 244                 prev_interval = interval;
 245         }
 246 }
 247
 248 /*
 249  * This is the thermal zone callback which does the delayed polling of the fan
 250  * state. We do check /sysfs-originating settings here in acerhdf_check_param()
 251  * as late as the polling interval is since we can't do that in the respective
 252  * accessors of the module parameters.
 253  */
 254 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal,
 255                                unsigned long *t)
 256 {
 257         int temp, err = 0;
 258
 259         acerhdf_check_param(thermal);
 260
 261         err = acerhdf_get_temp(&temp);
 262         if (err)
 263                 return err;
 264
 265         if (verbose)
 266                 pr_notice("temp %d\n", temp);
 267
 268         *t = temp;
 269         return 0;
 270 }
 271
 272 static int acerhdf_bind(struct thermal_zone_device *thermal,
 273                         struct thermal_cooling_device *cdev)
 274 {
 275         /* if the cooling device is the one from acerhdf bind it */
 276         if (cdev != cl_dev)
 277                 return 0;
 278
 279         if (thermal_zone_bind_cooling_device(thermal, 0, cdev)) {
 280                 pr_err("error binding cooling dev\n");
 281                 return -EINVAL;
 282         }
 283         return 0;
 284 }
 285
 286 static int acerhdf_unbind(struct thermal_zone_device *thermal,
 287                           struct thermal_cooling_device *cdev)
 288 {
 289         if (cdev != cl_dev)
 290                 return 0;
 291
 292         if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
 293                 pr_err("error unbinding cooling dev\n");
 294                 return -EINVAL;
 295         }
 296         return 0;
 297 }
 298
 299 static inline void acerhdf_revert_to_bios_mode(void)
 300 {
 301         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 302         kernelmode = 0;
 303         if (thz_dev)
 304                 thz_dev->polling_delay = 0;
 305         pr_notice("kernel mode fan control OFF\n");
 306 }
 307 static inline void acerhdf_enable_kernelmode(void)
 308 {
 309         kernelmode = 1;
 310
 311         thz_dev->polling_delay = interval*1000;
 312         thermal_zone_device_update(thz_dev);
 313         pr_notice("kernel mode fan control ON\n");
 314 }
 315
 316 static int acerhdf_get_mode(struct thermal_zone_device *thermal,
 317                             enum thermal_device_mode *mode)
 318 {
 319         if (verbose)
 320                 pr_notice("kernel mode fan control %d\n", kernelmode);
 321
 322         *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED
 323                              : THERMAL_DEVICE_DISABLED;
 324
 325         return 0;
 326 }
 327
 328 /*
 329  * set operation mode;
 330  * enabled: the thermal layer of the kernel takes care about
 331  *          the temperature and the fan.
 332  * disabled: the BIOS takes control of the fan.
 333  */
 334 static int acerhdf_set_mode(struct thermal_zone_device *thermal,
 335                             enum thermal_device_mode mode)
 336 {
 337         if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
 338                 acerhdf_revert_to_bios_mode();
 339         else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
 340                 acerhdf_enable_kernelmode();
 341
 342         return 0;
 343 }
 344
 345 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
 346                                  enum thermal_trip_type *type)
 347 {
 348         if (trip == 0)
 349                 *type = THERMAL_TRIP_ACTIVE;
 350
 351         return 0;
 352 }
 353
 354 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
 355                                  unsigned long *temp)
 356 {
 357         if (trip == 0)
 358                 *temp = fanon;
 359
 360         return 0;
 361 }
 362
 363 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
 364                                  unsigned long *temperature)
 365 {
 366         *temperature = ACERHDF_TEMP_CRIT;
 367         return 0;
 368 }
 369
 370 /* bind callback functions to thermalzone */
 371 struct thermal_zone_device_ops acerhdf_dev_ops = {
 372         .bind = acerhdf_bind,
 373         .unbind = acerhdf_unbind,
 374         .get_temp = acerhdf_get_ec_temp,
 375         .get_mode = acerhdf_get_mode,
 376         .set_mode = acerhdf_set_mode,
 377         .get_trip_type = acerhdf_get_trip_type,
 378         .get_trip_temp = acerhdf_get_trip_temp,
 379         .get_crit_temp = acerhdf_get_crit_temp,
 380 };
 381
 382
 383 /*
 384  * cooling device callback functions
 385  * get maximal fan cooling state
 386  */
 387 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
 388                                  unsigned long *state)
 389 {
 390         *state = 1;
 391
 392         return 0;
 393 }
 394
 395 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
 396                                  unsigned long *state)
 397 {
 398         int err = 0, tmp;
 399
 400         err = acerhdf_get_fanstate(&tmp);
 401         if (err)
 402                 return err;
 403
 404         *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
 405         return 0;
 406 }
 407
 408 /* change current fan state - is overwritten when running in kernel mode */
 409 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
 410                                  unsigned long state)
 411 {
 412         int cur_temp, cur_state, err = 0;
 413
 414         if (!kernelmode)
 415                 return 0;
 416
 417         err = acerhdf_get_temp(&cur_temp);
 418         if (err) {
 419                 pr_err("error reading temperature, hand off control to BIOS\n");
 420                 goto err_out;
 421         }
 422
 423         err = acerhdf_get_fanstate(&cur_state);
 424         if (err) {
 425                 pr_err("error reading fan state, hand off control to BIOS\n");
 426                 goto err_out;
 427         }
 428
 429         if (state == 0) {
 430                 /* turn fan off only if below fanoff temperature */
 431                 if ((cur_state == ACERHDF_FAN_AUTO) &&
 432                     (cur_temp < fanoff))
 433                         acerhdf_change_fanstate(ACERHDF_FAN_OFF);
 434         } else {
 435                 if (cur_state == ACERHDF_FAN_OFF)
 436                         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 437         }
 438         return 0;
 439
 440 err_out:
 441         acerhdf_revert_to_bios_mode();
 442         return -EINVAL;
 443 }
 444
 445 /* bind fan callbacks to fan device */
 446 struct thermal_cooling_device_ops acerhdf_cooling_ops = {
 447         .get_max_state = acerhdf_get_max_state,
 448         .get_cur_state = acerhdf_get_cur_state,
 449         .set_cur_state = acerhdf_set_cur_state,
 450 };
 451
 452 /* suspend / resume functionality */
 453 static int acerhdf_suspend(struct device *dev)
 454 {
 455         if (kernelmode)
 456                 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 457
 458         if (verbose)
 459                 pr_notice("going suspend\n");
 460
 461         return 0;
 462 }
 463
 464 static int __devinit acerhdf_probe(struct platform_device *device)
 465 {
 466         return 0;
 467 }
 468
 469 static int acerhdf_remove(struct platform_device *device)
 470 {
 471         return 0;
 472 }
 473
 474 static struct dev_pm_ops acerhdf_pm_ops = {
 475         .suspend = acerhdf_suspend,
 476         .freeze  = acerhdf_suspend,
 477 };
 478
 479 static struct platform_driver acerhdf_driver = {
 480         .driver = {
 481                 .name  = "acerhdf",
 482                 .owner = THIS_MODULE,
 483                 .pm    = &acerhdf_pm_ops,
 484         },
 485         .probe = acerhdf_probe,
 486         .remove = acerhdf_remove,
 487 };
 488
 489
 490 /* check hardware */
 491 static int acerhdf_check_hardware(void)
 492 {
 493         char const *vendor, *version, *product;
 494         int i;
 495         unsigned long prod_len = 0;
 496
 497         /* get BIOS data */
 498         vendor  = dmi_get_system_info(DMI_SYS_VENDOR);
 499         version = dmi_get_system_info(DMI_BIOS_VERSION);
 500         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 501
 502
 503         pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
 504
 505         if (force_bios[0]) {
 506                 version = force_bios;
 507                 pr_info("forcing BIOS version: %s\n", version);
 508                 kernelmode = 0;
 509         }
 510
 511         if (force_product[0]) {
 512                 product = force_product;
 513                 pr_info("forcing BIOS product: %s\n", product);
 514                 kernelmode = 0;
 515         }
 516
 517         prod_len = strlen(product);
 518
 519         if (verbose)
 520                 pr_info("BIOS info: %s %s, product: %s\n",
 521                         vendor, version, product);
 522
 523         /* search BIOS version and vendor in BIOS settings table */
 524         for (i = 0; bios_tbl[i].version[0]; i++) {
 525                 if (strlen(bios_tbl[i].product) >= prod_len &&
 526                     !strncmp(bios_tbl[i].product, product,
 527                            strlen(bios_tbl[i].product)) &&
 528                     !strcmp(bios_tbl[i].vendor, vendor) &&
 529                     !strcmp(bios_tbl[i].version, version)) {
 530                         bios_cfg = &bios_tbl[i];
 531                         break;
 532                 }
 533         }
 534
 535         if (!bios_cfg) {
 536                 pr_err("unknown (unsupported) BIOS version %s/%s/%s, "
 537                         "please report, aborting!\n", vendor, product, version);
 538                 return -EINVAL;
 539         }
 540
 541         /*
 542          * if started with kernel mode off, prevent the kernel from switching
 543          * off the fan
 544          */
 545         if (!kernelmode) {
 546                 pr_notice("Fan control off, to enable do:\n");
 547                 pr_notice("echo -n \"enabled\" > "
 548                         "/sys/class/thermal/thermal_zone0/mode\n");
 549         }
 550
 551         return 0;
 552 }
 553
 554 static int acerhdf_register_platform(void)
 555 {
 556         int err = 0;
 557
 558         err = platform_driver_register(&acerhdf_driver);
 559         if (err)
 560                 return err;
 561
 562         acerhdf_dev = platform_device_alloc("acerhdf", -1);
 563         platform_device_add(acerhdf_dev);
 564
 565         return 0;
 566 }
 567
 568 static void acerhdf_unregister_platform(void)
 569 {
 570         if (!acerhdf_dev)
 571                 return;
 572
 573         platform_device_del(acerhdf_dev);
 574         platform_driver_unregister(&acerhdf_driver);
 575 }
 576
 577 static int acerhdf_register_thermal(void)
 578 {
 579         cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
 580                                                  &acerhdf_cooling_ops);
 581
 582         if (IS_ERR(cl_dev))
 583                 return -EINVAL;
 584
 585         thz_dev = thermal_zone_device_register("acerhdf", 1, NULL,
 586                                               &acerhdf_dev_ops, 0, 0, 0,
 587                                               (kernelmode) ? interval*1000 : 0);
 588         if (IS_ERR(thz_dev))
 589                 return -EINVAL;
 590
 591         return 0;
 592 }
 593
 594 static void acerhdf_unregister_thermal(void)
 595 {
 596         if (cl_dev) {
 597                 thermal_cooling_device_unregister(cl_dev);
 598                 cl_dev = NULL;
 599         }
 600
 601         if (thz_dev) {
 602                 thermal_zone_device_unregister(thz_dev);
 603                 thz_dev = NULL;
 604         }
 605 }
 606
 607 static int __init acerhdf_init(void)
 608 {
 609         int err = 0;
 610
 611         err = acerhdf_check_hardware();
 612         if (err)
 613                 goto out_err;
 614
 615         err = acerhdf_register_platform();
 616         if (err)
 617                 goto err_unreg;
 618
 619         err = acerhdf_register_thermal();
 620         if (err)
 621                 goto err_unreg;
 622
 623         return 0;
 624
 625 err_unreg:
 626         acerhdf_unregister_thermal();
 627         acerhdf_unregister_platform();
 628
 629 out_err:
 630         return -ENODEV;
 631 }
 632
 633 static void __exit acerhdf_exit(void)
 634 {
 635         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 636         acerhdf_unregister_thermal();
 637         acerhdf_unregister_platform();
 638 }
 639
 640 MODULE_LICENSE("GPL");
 641 MODULE_AUTHOR("Peter Feuerer");
 642 MODULE_DESCRIPTION("Aspire One temperature and fan driver");
 643 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
 644 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
 645 MODULE_ALIAS("dmi:*:*Packard Bell*:pnAOA*:");
 646 MODULE_ALIAS("dmi:*:*Packard Bell*:pnDOA*:");
 647
 648 module_init(acerhdf_init);
 649 module_exit(acerhdf_exit);