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 "0.5.23"
  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 and check if the fan is off
 116  *      cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then
 117  *              the fan speed depending on the temperature
 118  */
 119 struct fancmd {
 120         u8 cmd_off;
 121         u8 cmd_auto;
 122 };
 123
 124 /* BIOS settings */
 125 struct bios_settings_t {
 126         const char *vendor;
 127         const char *product;
 128         const char *version;
 129         unsigned char fanreg;
 130         unsigned char tempreg;
 131         struct fancmd cmd;
 132 };
 133
 134 /* Register addresses and values for different BIOS versions */
 135 static const struct bios_settings_t bios_tbl[] = {
 136         /* AOA110 */
 137         {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00} },
 138         {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00} },
 139         {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00} },
 140         {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00} },
 141         {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00} },
 142         {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00} },
 143         {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00} },
 144         {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00} },
 145         {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00} },
 146         /* AOA150 */
 147         {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x1f, 0x00} },
 148         {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00} },
 149         {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00} },
 150         {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00} },
 151         {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00} },
 152         {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00} },
 153         {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00} },
 154         {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00} },
 155         /* Acer 1410 */
 156         {"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
 157         {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
 158         {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
 159         /* Acer 1810xx */
 160         {"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
 161         {"Acer", "Aspire 1810T",  "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
 162         {"Acer", "Aspire 1810TZ", "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
 163         {"Acer", "Aspire 1810T",  "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
 164         {"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
 165         {"Acer", "Aspire 1810T",  "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
 166         {"Acer", "Aspire 1810TZ", "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
 167         {"Acer", "Aspire 1810T",  "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
 168         {"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
 169         {"Acer", "Aspire 1810T",  "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
 170         /* Gateway */
 171         {"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x00} },
 172         {"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x00} },
 173         {"Gateway", "LT31",   "v1.3103", 0x55, 0x58, {0x9e, 0x00} },
 174         {"Gateway", "LT31",   "v1.3201", 0x55, 0x58, {0x9e, 0x00} },
 175         {"Gateway", "LT31",   "v1.3302", 0x55, 0x58, {0x9e, 0x00} },
 176         /* Packard Bell */
 177         {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00} },
 178         {"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} },
 179         {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00} },
 180         {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} },
 181         {"Packard Bell", "DOTMU",  "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
 182         {"Packard Bell", "DOTMU",  "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
 183         {"Packard Bell", "DOTMA",  "v1.3201", 0x55, 0x58, {0x9e, 0x00} },
 184         /* pewpew-terminator */
 185         {"", "", "", 0, 0, {0, 0} }
 186 };
 187
 188 static const struct bios_settings_t *bios_cfg __read_mostly;
 189
 190 static int acerhdf_get_temp(int *temp)
 191 {
 192         u8 read_temp;
 193
 194         if (ec_read(bios_cfg->tempreg, &read_temp))
 195                 return -EINVAL;
 196
 197         *temp = read_temp * 1000;
 198
 199         return 0;
 200 }
 201
 202 static int acerhdf_get_fanstate(int *state)
 203 {
 204         u8 fan;
 205
 206         if (ec_read(bios_cfg->fanreg, &fan))
 207                 return -EINVAL;
 208
 209         if (fan != bios_cfg->cmd.cmd_off)
 210                 *state = ACERHDF_FAN_AUTO;
 211         else
 212                 *state = ACERHDF_FAN_OFF;
 213
 214         return 0;
 215 }
 216
 217 static void acerhdf_change_fanstate(int state)
 218 {
 219         unsigned char cmd;
 220
 221         if (verbose)
 222                 pr_notice("fan %s\n", (state == ACERHDF_FAN_OFF) ?
 223                                 "OFF" : "ON");
 224
 225         if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
 226                 pr_err("invalid fan state %d requested, setting to auto!\n",
 227                         state);
 228                 state = ACERHDF_FAN_AUTO;
 229         }
 230
 231         cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off
 232                                          : bios_cfg->cmd.cmd_auto;
 233         fanstate = state;
 234
 235         ec_write(bios_cfg->fanreg, cmd);
 236 }
 237
 238 static void acerhdf_check_param(struct thermal_zone_device *thermal)
 239 {
 240         if (fanon > ACERHDF_MAX_FANON) {
 241                 pr_err("fanon temperature too high, set to %d\n",
 242                                 ACERHDF_MAX_FANON);
 243                 fanon = ACERHDF_MAX_FANON;
 244         }
 245
 246         if (kernelmode && prev_interval != interval) {
 247                 if (interval > ACERHDF_MAX_INTERVAL) {
 248                         pr_err("interval too high, set to %d\n",
 249                                 ACERHDF_MAX_INTERVAL);
 250                         interval = ACERHDF_MAX_INTERVAL;
 251                 }
 252                 if (verbose)
 253                         pr_notice("interval changed to: %d\n",
 254                                         interval);
 255                 thermal->polling_delay = interval*1000;
 256                 prev_interval = interval;
 257         }
 258 }
 259
 260 /*
 261  * This is the thermal zone callback which does the delayed polling of the fan
 262  * state. We do check /sysfs-originating settings here in acerhdf_check_param()
 263  * as late as the polling interval is since we can't do that in the respective
 264  * accessors of the module parameters.
 265  */
 266 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal,
 267                                unsigned long *t)
 268 {
 269         int temp, err = 0;
 270
 271         acerhdf_check_param(thermal);
 272
 273         err = acerhdf_get_temp(&temp);
 274         if (err)
 275                 return err;
 276
 277         if (verbose)
 278                 pr_notice("temp %d\n", temp);
 279
 280         *t = temp;
 281         return 0;
 282 }
 283
 284 static int acerhdf_bind(struct thermal_zone_device *thermal,
 285                         struct thermal_cooling_device *cdev)
 286 {
 287         /* if the cooling device is the one from acerhdf bind it */
 288         if (cdev != cl_dev)
 289                 return 0;
 290
 291         if (thermal_zone_bind_cooling_device(thermal, 0, cdev)) {
 292                 pr_err("error binding cooling dev\n");
 293                 return -EINVAL;
 294         }
 295         return 0;
 296 }
 297
 298 static int acerhdf_unbind(struct thermal_zone_device *thermal,
 299                           struct thermal_cooling_device *cdev)
 300 {
 301         if (cdev != cl_dev)
 302                 return 0;
 303
 304         if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
 305                 pr_err("error unbinding cooling dev\n");
 306                 return -EINVAL;
 307         }
 308         return 0;
 309 }
 310
 311 static inline void acerhdf_revert_to_bios_mode(void)
 312 {
 313         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 314         kernelmode = 0;
 315         if (thz_dev)
 316                 thz_dev->polling_delay = 0;
 317         pr_notice("kernel mode fan control OFF\n");
 318 }
 319 static inline void acerhdf_enable_kernelmode(void)
 320 {
 321         kernelmode = 1;
 322
 323         thz_dev->polling_delay = interval*1000;
 324         thermal_zone_device_update(thz_dev);
 325         pr_notice("kernel mode fan control ON\n");
 326 }
 327
 328 static int acerhdf_get_mode(struct thermal_zone_device *thermal,
 329                             enum thermal_device_mode *mode)
 330 {
 331         if (verbose)
 332                 pr_notice("kernel mode fan control %d\n", kernelmode);
 333
 334         *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED
 335                              : THERMAL_DEVICE_DISABLED;
 336
 337         return 0;
 338 }
 339
 340 /*
 341  * set operation mode;
 342  * enabled: the thermal layer of the kernel takes care about
 343  *          the temperature and the fan.
 344  * disabled: the BIOS takes control of the fan.
 345  */
 346 static int acerhdf_set_mode(struct thermal_zone_device *thermal,
 347                             enum thermal_device_mode mode)
 348 {
 349         if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
 350                 acerhdf_revert_to_bios_mode();
 351         else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
 352                 acerhdf_enable_kernelmode();
 353
 354         return 0;
 355 }
 356
 357 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
 358                                  enum thermal_trip_type *type)
 359 {
 360         if (trip == 0)
 361                 *type = THERMAL_TRIP_ACTIVE;
 362
 363         return 0;
 364 }
 365
 366 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
 367                                  unsigned long *temp)
 368 {
 369         if (trip == 0)
 370                 *temp = fanon;
 371
 372         return 0;
 373 }
 374
 375 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
 376                                  unsigned long *temperature)
 377 {
 378         *temperature = ACERHDF_TEMP_CRIT;
 379         return 0;
 380 }
 381
 382 /* bind callback functions to thermalzone */
 383 struct thermal_zone_device_ops acerhdf_dev_ops = {
 384         .bind = acerhdf_bind,
 385         .unbind = acerhdf_unbind,
 386         .get_temp = acerhdf_get_ec_temp,
 387         .get_mode = acerhdf_get_mode,
 388         .set_mode = acerhdf_set_mode,
 389         .get_trip_type = acerhdf_get_trip_type,
 390         .get_trip_temp = acerhdf_get_trip_temp,
 391         .get_crit_temp = acerhdf_get_crit_temp,
 392 };
 393
 394
 395 /*
 396  * cooling device callback functions
 397  * get maximal fan cooling state
 398  */
 399 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
 400                                  unsigned long *state)
 401 {
 402         *state = 1;
 403
 404         return 0;
 405 }
 406
 407 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
 408                                  unsigned long *state)
 409 {
 410         int err = 0, tmp;
 411
 412         err = acerhdf_get_fanstate(&tmp);
 413         if (err)
 414                 return err;
 415
 416         *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
 417         return 0;
 418 }
 419
 420 /* change current fan state - is overwritten when running in kernel mode */
 421 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
 422                                  unsigned long state)
 423 {
 424         int cur_temp, cur_state, err = 0;
 425
 426         if (!kernelmode)
 427                 return 0;
 428
 429         err = acerhdf_get_temp(&cur_temp);
 430         if (err) {
 431                 pr_err("error reading temperature, hand off control to BIOS\n");
 432                 goto err_out;
 433         }
 434
 435         err = acerhdf_get_fanstate(&cur_state);
 436         if (err) {
 437                 pr_err("error reading fan state, hand off control to BIOS\n");
 438                 goto err_out;
 439         }
 440
 441         if (state == 0) {
 442                 /* turn fan off only if below fanoff temperature */
 443                 if ((cur_state == ACERHDF_FAN_AUTO) &&
 444                     (cur_temp < fanoff))
 445                         acerhdf_change_fanstate(ACERHDF_FAN_OFF);
 446         } else {
 447                 if (cur_state == ACERHDF_FAN_OFF)
 448                         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 449         }
 450         return 0;
 451
 452 err_out:
 453         acerhdf_revert_to_bios_mode();
 454         return -EINVAL;
 455 }
 456
 457 /* bind fan callbacks to fan device */
 458 struct thermal_cooling_device_ops acerhdf_cooling_ops = {
 459         .get_max_state = acerhdf_get_max_state,
 460         .get_cur_state = acerhdf_get_cur_state,
 461         .set_cur_state = acerhdf_set_cur_state,
 462 };
 463
 464 /* suspend / resume functionality */
 465 static int acerhdf_suspend(struct device *dev)
 466 {
 467         if (kernelmode)
 468                 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 469
 470         if (verbose)
 471                 pr_notice("going suspend\n");
 472
 473         return 0;
 474 }
 475
 476 static int __devinit acerhdf_probe(struct platform_device *device)
 477 {
 478         return 0;
 479 }
 480
 481 static int acerhdf_remove(struct platform_device *device)
 482 {
 483         return 0;
 484 }
 485
 486 static const struct dev_pm_ops acerhdf_pm_ops = {
 487         .suspend = acerhdf_suspend,
 488         .freeze  = acerhdf_suspend,
 489 };
 490
 491 static struct platform_driver acerhdf_driver = {
 492         .driver = {
 493                 .name  = "acerhdf",
 494                 .owner = THIS_MODULE,
 495                 .pm    = &acerhdf_pm_ops,
 496         },
 497         .probe = acerhdf_probe,
 498         .remove = acerhdf_remove,
 499 };
 500
 501 /* checks if str begins with start */
 502 static int str_starts_with(const char *str, const char *start)
 503 {
 504         unsigned long str_len = 0, start_len = 0;
 505
 506         str_len = strlen(str);
 507         start_len = strlen(start);
 508
 509         if (str_len >= start_len &&
 510                         !strncmp(str, start, start_len))
 511                 return 1;
 512
 513         return 0;
 514 }
 515
 516 /* check hardware */
 517 static int acerhdf_check_hardware(void)
 518 {
 519         char const *vendor, *version, *product;
 520         const struct bios_settings_t *bt = NULL;
 521
 522         /* get BIOS data */
 523         vendor  = dmi_get_system_info(DMI_SYS_VENDOR);
 524         version = dmi_get_system_info(DMI_BIOS_VERSION);
 525         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 526
 527         if (!vendor || !version || !product) {
 528                 pr_err("error getting hardware information\n");
 529                 return -EINVAL;
 530         }
 531
 532         pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
 533
 534         if (force_bios[0]) {
 535                 version = force_bios;
 536                 pr_info("forcing BIOS version: %s\n", version);
 537                 kernelmode = 0;
 538         }
 539
 540         if (force_product[0]) {
 541                 product = force_product;
 542                 pr_info("forcing BIOS product: %s\n", product);
 543                 kernelmode = 0;
 544         }
 545
 546         if (verbose)
 547                 pr_info("BIOS info: %s %s, product: %s\n",
 548                         vendor, version, product);
 549
 550         /* search BIOS version and vendor in BIOS settings table */
 551         for (bt = bios_tbl; bt->vendor[0]; bt++) {
 552                 /*
 553                  * check if actual hardware BIOS vendor, product and version
 554                  * IDs start with the strings of BIOS table entry
 555                  */
 556                 if (str_starts_with(vendor, bt->vendor) &&
 557                                 str_starts_with(product, bt->product) &&
 558                                 str_starts_with(version, bt->version)) {
 559                         bios_cfg = bt;
 560                         break;
 561                 }
 562         }
 563
 564         if (!bios_cfg) {
 565                 pr_err("unknown (unsupported) BIOS version %s/%s/%s, "
 566                         "please report, aborting!\n", vendor, product, version);
 567                 return -EINVAL;
 568         }
 569
 570         /*
 571          * if started with kernel mode off, prevent the kernel from switching
 572          * off the fan
 573          */
 574         if (!kernelmode) {
 575                 pr_notice("Fan control off, to enable do:\n");
 576                 pr_notice("echo -n \"enabled\" > "
 577                         "/sys/class/thermal/thermal_zone0/mode\n");
 578         }
 579
 580         return 0;
 581 }
 582
 583 static int acerhdf_register_platform(void)
 584 {
 585         int err = 0;
 586
 587         err = platform_driver_register(&acerhdf_driver);
 588         if (err)
 589                 return err;
 590
 591         acerhdf_dev = platform_device_alloc("acerhdf", -1);
 592         platform_device_add(acerhdf_dev);
 593
 594         return 0;
 595 }
 596
 597 static void acerhdf_unregister_platform(void)
 598 {
 599         if (!acerhdf_dev)
 600                 return;
 601
 602         platform_device_del(acerhdf_dev);
 603         platform_driver_unregister(&acerhdf_driver);
 604 }
 605
 606 static int acerhdf_register_thermal(void)
 607 {
 608         cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
 609                                                  &acerhdf_cooling_ops);
 610
 611         if (IS_ERR(cl_dev))
 612                 return -EINVAL;
 613
 614         thz_dev = thermal_zone_device_register("acerhdf", 1, NULL,
 615                                               &acerhdf_dev_ops, 0, 0, 0,
 616                                               (kernelmode) ? interval*1000 : 0);
 617         if (IS_ERR(thz_dev))
 618                 return -EINVAL;
 619
 620         return 0;
 621 }
 622
 623 static void acerhdf_unregister_thermal(void)
 624 {
 625         if (cl_dev) {
 626                 thermal_cooling_device_unregister(cl_dev);
 627                 cl_dev = NULL;
 628         }
 629
 630         if (thz_dev) {
 631                 thermal_zone_device_unregister(thz_dev);
 632                 thz_dev = NULL;
 633         }
 634 }
 635
 636 static int __init acerhdf_init(void)
 637 {
 638         int err = 0;
 639
 640         err = acerhdf_check_hardware();
 641         if (err)
 642                 goto out_err;
 643
 644         err = acerhdf_register_platform();
 645         if (err)
 646                 goto err_unreg;
 647
 648         err = acerhdf_register_thermal();
 649         if (err)
 650                 goto err_unreg;
 651
 652         return 0;
 653
 654 err_unreg:
 655         acerhdf_unregister_thermal();
 656         acerhdf_unregister_platform();
 657
 658 out_err:
 659         return -ENODEV;
 660 }
 661
 662 static void __exit acerhdf_exit(void)
 663 {
 664         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 665         acerhdf_unregister_thermal();
 666         acerhdf_unregister_platform();
 667 }
 668
 669 MODULE_LICENSE("GPL");
 670 MODULE_AUTHOR("Peter Feuerer");
 671 MODULE_DESCRIPTION("Aspire One temperature and fan driver");
 672 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
 673 MODULE_ALIAS("dmi:*:*Acer*:pnAspire 1410*:");
 674 MODULE_ALIAS("dmi:*:*Acer*:pnAspire 1810*:");
 675 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
 676 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
 677 MODULE_ALIAS("dmi:*:*Packard Bell*:pnAOA*:");
 678 MODULE_ALIAS("dmi:*:*Packard Bell*:pnDOA*:");
 679 MODULE_ALIAS("dmi:*:*Packard Bell*:pnDOTMU*:");
 680 MODULE_ALIAS("dmi:*:*Packard Bell*:pnDOTMA*:");
 681
 682 module_init(acerhdf_init);
 683 module_exit(acerhdf_exit);