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     bp (a) alien8.de
   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/dmi.h>
  39 #include <linux/acpi.h>
  40 #include <linux/thermal.h>
  41 #include <linux/platform_device.h>
  42
  43 /*
  44  * The driver is started with "kernel mode off" by default. That means, the BIOS
  45  * is still in control of the fan. In this mode the driver allows to read the
  46  * temperature of the cpu and a userspace tool may take over control of the fan.
  47  * If the driver is switched to "kernel mode" (e.g. via module parameter) the
  48  * driver is in full control of the fan. If you want the module to be started in
  49  * kernel mode by default, define the following:
  50  */
  51 #undef START_IN_KERNEL_MODE
  52
  53 #define DRV_VER "0.5.26"
  54
  55 /*
  56  * According to the Atom N270 datasheet,
  57  * (http://download.intel.com/design/processor/datashts/320032.pdf) the
  58  * CPU's optimal operating limits denoted in junction temperature as
  59  * measured by the on-die thermal monitor are within 0 <= Tj <= 90. So,
  60  * assume 89°C is critical temperature.
  61  */
  62 #define ACERHDF_TEMP_CRIT 89000
  63 #define ACERHDF_FAN_OFF 0
  64 #define ACERHDF_FAN_AUTO 1
  65
  66 /*
  67  * No matter what value the user puts into the fanon variable, turn on the fan
  68  * at 80 degree Celsius to prevent hardware damage
  69  */
  70 #define ACERHDF_MAX_FANON 80000
  71
  72 /*
  73  * Maximum interval between two temperature checks is 15 seconds, as the die
  74  * can get hot really fast under heavy load (plus we shouldn't forget about
  75  * possible impact of _external_ aggressive sources such as heaters, sun etc.)
  76  */
  77 #define ACERHDF_MAX_INTERVAL 15
  78
  79 #ifdef START_IN_KERNEL_MODE
  80 static int kernelmode = 1;
  81 #else
  82 static int kernelmode;
  83 #endif
  84
  85 static unsigned int interval = 10;
  86 static unsigned int fanon = 60000;
  87 static unsigned int fanoff = 53000;
  88 static unsigned int verbose;
  89 static unsigned int fanstate = ACERHDF_FAN_AUTO;
  90 static char force_bios[16];
  91 static char force_product[16];
  92 static unsigned int prev_interval;
  93 static struct thermal_zone_device *thz_dev;
  94 static struct thermal_cooling_device *cl_dev;
  95 static struct platform_device *acerhdf_dev;
  96
  97 module_param(kernelmode, uint, 0);
  98 MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off");
  99 module_param(interval, uint, 0600);
 100 MODULE_PARM_DESC(interval, "Polling interval of temperature check");
 101 module_param(fanon, uint, 0600);
 102 MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature");
 103 module_param(fanoff, uint, 0600);
 104 MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature");
 105 module_param(verbose, uint, 0600);
 106 MODULE_PARM_DESC(verbose, "Enable verbose dmesg output");
 107 module_param_string(force_bios, force_bios, 16, 0);
 108 MODULE_PARM_DESC(force_bios, "Force BIOS version and omit BIOS check");
 109 module_param_string(force_product, force_product, 16, 0);
 110 MODULE_PARM_DESC(force_product, "Force BIOS product and omit BIOS check");
 111
 112 /*
 113  * cmd_off: to switch the fan completely off and check if the fan is off
 114  *      cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then
 115  *              the fan speed depending on the temperature
 116  */
 117 struct fancmd {
 118         u8 cmd_off;
 119         u8 cmd_auto;
 120 };
 121
 122 /* BIOS settings */
 123 struct bios_settings_t {
 124         const char *vendor;
 125         const char *product;
 126         const char *version;
 127         unsigned char fanreg;
 128         unsigned char tempreg;
 129         struct fancmd cmd;
 130 };
 131
 132 /* Register addresses and values for different BIOS versions */
 133 static const struct bios_settings_t bios_tbl[] = {
 134         /* AOA110 */
 135         {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00} },
 136         {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00} },
 137         {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00} },
 138         {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00} },
 139         {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00} },
 140         {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00} },
 141         {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00} },
 142         {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00} },
 143         {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00} },
 144         /* AOA150 */
 145         {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x1f, 0x00} },
 146         {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00} },
 147         {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00} },
 148         {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00} },
 149         {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00} },
 150         {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00} },
 151         {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00} },
 152         {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00} },
 153         /* LT1005u */
 154         {"Acer", "LT-10Q", "v0.3310", 0x55, 0x58, {0x20, 0x00} },
 155         /* Acer 1410 */
 156         {"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
 157         {"Acer", "Aspire 1410", "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
 158         {"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
 159         {"Acer", "Aspire 1410", "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
 160         {"Acer", "Aspire 1410", "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
 161         {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
 162         {"Acer", "Aspire 1410", "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
 163         {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
 164         {"Acer", "Aspire 1410", "v1.3308", 0x55, 0x58, {0x9e, 0x00} },
 165         {"Acer", "Aspire 1410", "v1.3310", 0x55, 0x58, {0x9e, 0x00} },
 166         {"Acer", "Aspire 1410", "v1.3314", 0x55, 0x58, {0x9e, 0x00} },
 167         /* Acer 1810xx */
 168         {"Acer", "Aspire 1810TZ", "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
 169         {"Acer", "Aspire 1810T",  "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
 170         {"Acer", "Aspire 1810TZ", "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
 171         {"Acer", "Aspire 1810T",  "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
 172         {"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
 173         {"Acer", "Aspire 1810T",  "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
 174         {"Acer", "Aspire 1810TZ", "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
 175         {"Acer", "Aspire 1810T",  "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
 176         {"Acer", "Aspire 1810TZ", "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
 177         {"Acer", "Aspire 1810T",  "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
 178         {"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
 179         {"Acer", "Aspire 1810T",  "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
 180         {"Acer", "Aspire 1810TZ", "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
 181         {"Acer", "Aspire 1810T",  "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
 182         {"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
 183         {"Acer", "Aspire 1810T",  "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
 184         {"Acer", "Aspire 1810TZ", "v1.3308", 0x55, 0x58, {0x9e, 0x00} },
 185         {"Acer", "Aspire 1810T",  "v1.3308", 0x55, 0x58, {0x9e, 0x00} },
 186         {"Acer", "Aspire 1810TZ", "v1.3310", 0x55, 0x58, {0x9e, 0x00} },
 187         {"Acer", "Aspire 1810T",  "v1.3310", 0x55, 0x58, {0x9e, 0x00} },
 188         {"Acer", "Aspire 1810TZ", "v1.3314", 0x55, 0x58, {0x9e, 0x00} },
 189         {"Acer", "Aspire 1810T",  "v1.3314", 0x55, 0x58, {0x9e, 0x00} },
 190         /* Acer 531 */
 191         {"Acer", "AO531h", "v0.3104", 0x55, 0x58, {0x20, 0x00} },
 192         {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00} },
 193         {"Acer", "AO531h", "v0.3304", 0x55, 0x58, {0x20, 0x00} },
 194         /* Acer 751 */
 195         {"Acer", "AO751h", "V0.3212", 0x55, 0x58, {0x21, 0x00} },
 196         /* Acer 1825 */
 197         {"Acer", "Aspire 1825PTZ", "V1.3118", 0x55, 0x58, {0x9e, 0x00} },
 198         {"Acer", "Aspire 1825PTZ", "V1.3127", 0x55, 0x58, {0x9e, 0x00} },
 199         /* Acer TravelMate 7730 */
 200         {"Acer", "TravelMate 7730G", "v0.3509", 0x55, 0x58, {0xaf, 0x00} },
 201         /* Gateway */
 202         {"Gateway", "AOA110", "v0.3103",  0x55, 0x58, {0x21, 0x00} },
 203         {"Gateway", "AOA150", "v0.3103",  0x55, 0x58, {0x20, 0x00} },
 204         {"Gateway", "LT31",   "v1.3103",  0x55, 0x58, {0x9e, 0x00} },
 205         {"Gateway", "LT31",   "v1.3201",  0x55, 0x58, {0x9e, 0x00} },
 206         {"Gateway", "LT31",   "v1.3302",  0x55, 0x58, {0x9e, 0x00} },
 207         {"Gateway", "LT31",   "v1.3303t", 0x55, 0x58, {0x9e, 0x00} },
 208         /* Packard Bell */
 209         {"Packard Bell", "DOA150",  "v0.3104",  0x55, 0x58, {0x21, 0x00} },
 210         {"Packard Bell", "DOA150",  "v0.3105",  0x55, 0x58, {0x20, 0x00} },
 211         {"Packard Bell", "AOA110",  "v0.3105",  0x55, 0x58, {0x21, 0x00} },
 212         {"Packard Bell", "AOA150",  "v0.3105",  0x55, 0x58, {0x20, 0x00} },
 213         {"Packard Bell", "ENBFT",   "V1.3118",  0x55, 0x58, {0x9e, 0x00} },
 214         {"Packard Bell", "ENBFT",   "V1.3127",  0x55, 0x58, {0x9e, 0x00} },
 215         {"Packard Bell", "DOTMU",   "v1.3303",  0x55, 0x58, {0x9e, 0x00} },
 216         {"Packard Bell", "DOTMU",   "v0.3120",  0x55, 0x58, {0x9e, 0x00} },
 217         {"Packard Bell", "DOTMU",   "v0.3108",  0x55, 0x58, {0x9e, 0x00} },
 218         {"Packard Bell", "DOTMU",   "v0.3113",  0x55, 0x58, {0x9e, 0x00} },
 219         {"Packard Bell", "DOTMU",   "v0.3115",  0x55, 0x58, {0x9e, 0x00} },
 220         {"Packard Bell", "DOTMU",   "v0.3117",  0x55, 0x58, {0x9e, 0x00} },
 221         {"Packard Bell", "DOTMU",   "v0.3119",  0x55, 0x58, {0x9e, 0x00} },
 222         {"Packard Bell", "DOTMU",   "v1.3204",  0x55, 0x58, {0x9e, 0x00} },
 223         {"Packard Bell", "DOTMA",   "v1.3201",  0x55, 0x58, {0x9e, 0x00} },
 224         {"Packard Bell", "DOTMA",   "v1.3302",  0x55, 0x58, {0x9e, 0x00} },
 225         {"Packard Bell", "DOTMA",   "v1.3303t", 0x55, 0x58, {0x9e, 0x00} },
 226         {"Packard Bell", "DOTVR46", "v1.3308",  0x55, 0x58, {0x9e, 0x00} },
 227         /* pewpew-terminator */
 228         {"", "", "", 0, 0, {0, 0} }
 229 };
 230
 231 static const struct bios_settings_t *bios_cfg __read_mostly;
 232
 233 static int acerhdf_get_temp(int *temp)
 234 {
 235         u8 read_temp;
 236
 237         if (ec_read(bios_cfg->tempreg, &read_temp))
 238                 return -EINVAL;
 239
 240         *temp = read_temp * 1000;
 241
 242         return 0;
 243 }
 244
 245 static int acerhdf_get_fanstate(int *state)
 246 {
 247         u8 fan;
 248
 249         if (ec_read(bios_cfg->fanreg, &fan))
 250                 return -EINVAL;
 251
 252         if (fan != bios_cfg->cmd.cmd_off)
 253                 *state = ACERHDF_FAN_AUTO;
 254         else
 255                 *state = ACERHDF_FAN_OFF;
 256
 257         return 0;
 258 }
 259
 260 static void acerhdf_change_fanstate(int state)
 261 {
 262         unsigned char cmd;
 263
 264         if (verbose)
 265                 pr_notice("fan %s\n", state == ACERHDF_FAN_OFF ? "OFF" : "ON");
 266
 267         if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
 268                 pr_err("invalid fan state %d requested, setting to auto!\n",
 269                        state);
 270                 state = ACERHDF_FAN_AUTO;
 271         }
 272
 273         cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off
 274                                          : bios_cfg->cmd.cmd_auto;
 275         fanstate = state;
 276
 277         ec_write(bios_cfg->fanreg, cmd);
 278 }
 279
 280 static void acerhdf_check_param(struct thermal_zone_device *thermal)
 281 {
 282         if (fanon > ACERHDF_MAX_FANON) {
 283                 pr_err("fanon temperature too high, set to %d\n",
 284                        ACERHDF_MAX_FANON);
 285                 fanon = ACERHDF_MAX_FANON;
 286         }
 287
 288         if (kernelmode && prev_interval != interval) {
 289                 if (interval > ACERHDF_MAX_INTERVAL) {
 290                         pr_err("interval too high, set to %d\n",
 291                                ACERHDF_MAX_INTERVAL);
 292                         interval = ACERHDF_MAX_INTERVAL;
 293                 }
 294                 if (verbose)
 295                         pr_notice("interval changed to: %d\n", interval);
 296                 thermal->polling_delay = interval*1000;
 297                 prev_interval = interval;
 298         }
 299 }
 300
 301 /*
 302  * This is the thermal zone callback which does the delayed polling of the fan
 303  * state. We do check /sysfs-originating settings here in acerhdf_check_param()
 304  * as late as the polling interval is since we can't do that in the respective
 305  * accessors of the module parameters.
 306  */
 307 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal,
 308                                unsigned long *t)
 309 {
 310         int temp, err = 0;
 311
 312         acerhdf_check_param(thermal);
 313
 314         err = acerhdf_get_temp(&temp);
 315         if (err)
 316                 return err;
 317
 318         if (verbose)
 319                 pr_notice("temp %d\n", temp);
 320
 321         *t = temp;
 322         return 0;
 323 }
 324
 325 static int acerhdf_bind(struct thermal_zone_device *thermal,
 326                         struct thermal_cooling_device *cdev)
 327 {
 328         /* if the cooling device is the one from acerhdf bind it */
 329         if (cdev != cl_dev)
 330                 return 0;
 331
 332         if (thermal_zone_bind_cooling_device(thermal, 0, cdev,
 333                         THERMAL_NO_LIMIT, THERMAL_NO_LIMIT)) {
 334                 pr_err("error binding cooling dev\n");
 335                 return -EINVAL;
 336         }
 337         return 0;
 338 }
 339
 340 static int acerhdf_unbind(struct thermal_zone_device *thermal,
 341                           struct thermal_cooling_device *cdev)
 342 {
 343         if (cdev != cl_dev)
 344                 return 0;
 345
 346         if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
 347                 pr_err("error unbinding cooling dev\n");
 348                 return -EINVAL;
 349         }
 350         return 0;
 351 }
 352
 353 static inline void acerhdf_revert_to_bios_mode(void)
 354 {
 355         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 356         kernelmode = 0;
 357         if (thz_dev)
 358                 thz_dev->polling_delay = 0;
 359         pr_notice("kernel mode fan control OFF\n");
 360 }
 361 static inline void acerhdf_enable_kernelmode(void)
 362 {
 363         kernelmode = 1;
 364
 365         thz_dev->polling_delay = interval*1000;
 366         thermal_zone_device_update(thz_dev);
 367         pr_notice("kernel mode fan control ON\n");
 368 }
 369
 370 static int acerhdf_get_mode(struct thermal_zone_device *thermal,
 371                             enum thermal_device_mode *mode)
 372 {
 373         if (verbose)
 374                 pr_notice("kernel mode fan control %d\n", kernelmode);
 375
 376         *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED
 377                              : THERMAL_DEVICE_DISABLED;
 378
 379         return 0;
 380 }
 381
 382 /*
 383  * set operation mode;
 384  * enabled: the thermal layer of the kernel takes care about
 385  *          the temperature and the fan.
 386  * disabled: the BIOS takes control of the fan.
 387  */
 388 static int acerhdf_set_mode(struct thermal_zone_device *thermal,
 389                             enum thermal_device_mode mode)
 390 {
 391         if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
 392                 acerhdf_revert_to_bios_mode();
 393         else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
 394                 acerhdf_enable_kernelmode();
 395
 396         return 0;
 397 }
 398
 399 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
 400                                  enum thermal_trip_type *type)
 401 {
 402         if (trip == 0)
 403                 *type = THERMAL_TRIP_ACTIVE;
 404
 405         return 0;
 406 }
 407
 408 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
 409                                  unsigned long *temp)
 410 {
 411         if (trip == 0)
 412                 *temp = fanon;
 413
 414         return 0;
 415 }
 416
 417 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
 418                                  unsigned long *temperature)
 419 {
 420         *temperature = ACERHDF_TEMP_CRIT;
 421         return 0;
 422 }
 423
 424 /* bind callback functions to thermalzone */
 425 static struct thermal_zone_device_ops acerhdf_dev_ops = {
 426         .bind = acerhdf_bind,
 427         .unbind = acerhdf_unbind,
 428         .get_temp = acerhdf_get_ec_temp,
 429         .get_mode = acerhdf_get_mode,
 430         .set_mode = acerhdf_set_mode,
 431         .get_trip_type = acerhdf_get_trip_type,
 432         .get_trip_temp = acerhdf_get_trip_temp,
 433         .get_crit_temp = acerhdf_get_crit_temp,
 434 };
 435
 436
 437 /*
 438  * cooling device callback functions
 439  * get maximal fan cooling state
 440  */
 441 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
 442                                  unsigned long *state)
 443 {
 444         *state = 1;
 445
 446         return 0;
 447 }
 448
 449 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
 450                                  unsigned long *state)
 451 {
 452         int err = 0, tmp;
 453
 454         err = acerhdf_get_fanstate(&tmp);
 455         if (err)
 456                 return err;
 457
 458         *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
 459         return 0;
 460 }
 461
 462 /* change current fan state - is overwritten when running in kernel mode */
 463 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
 464                                  unsigned long state)
 465 {
 466         int cur_temp, cur_state, err = 0;
 467
 468         if (!kernelmode)
 469                 return 0;
 470
 471         err = acerhdf_get_temp(&cur_temp);
 472         if (err) {
 473                 pr_err("error reading temperature, hand off control to BIOS\n");
 474                 goto err_out;
 475         }
 476
 477         err = acerhdf_get_fanstate(&cur_state);
 478         if (err) {
 479                 pr_err("error reading fan state, hand off control to BIOS\n");
 480                 goto err_out;
 481         }
 482
 483         if (state == 0) {
 484                 /* turn fan off only if below fanoff temperature */
 485                 if ((cur_state == ACERHDF_FAN_AUTO) &&
 486                     (cur_temp < fanoff))
 487                         acerhdf_change_fanstate(ACERHDF_FAN_OFF);
 488         } else {
 489                 if (cur_state == ACERHDF_FAN_OFF)
 490                         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 491         }
 492         return 0;
 493
 494 err_out:
 495         acerhdf_revert_to_bios_mode();
 496         return -EINVAL;
 497 }
 498
 499 /* bind fan callbacks to fan device */
 500 static struct thermal_cooling_device_ops acerhdf_cooling_ops = {
 501         .get_max_state = acerhdf_get_max_state,
 502         .get_cur_state = acerhdf_get_cur_state,
 503         .set_cur_state = acerhdf_set_cur_state,
 504 };
 505
 506 /* suspend / resume functionality */
 507 static int acerhdf_suspend(struct device *dev)
 508 {
 509         if (kernelmode)
 510                 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 511
 512         if (verbose)
 513                 pr_notice("going suspend\n");
 514
 515         return 0;
 516 }
 517
 518 static int acerhdf_probe(struct platform_device *device)
 519 {
 520         return 0;
 521 }
 522
 523 static int acerhdf_remove(struct platform_device *device)
 524 {
 525         return 0;
 526 }
 527
 528 static const struct dev_pm_ops acerhdf_pm_ops = {
 529         .suspend = acerhdf_suspend,
 530         .freeze  = acerhdf_suspend,
 531 };
 532
 533 static struct platform_driver acerhdf_driver = {
 534         .driver = {
 535                 .name  = "acerhdf",
 536                 .owner = THIS_MODULE,
 537                 .pm    = &acerhdf_pm_ops,
 538         },
 539         .probe = acerhdf_probe,
 540         .remove = acerhdf_remove,
 541 };
 542
 543 /* checks if str begins with start */
 544 static int str_starts_with(const char *str, const char *start)
 545 {
 546         unsigned long str_len = 0, start_len = 0;
 547
 548         str_len = strlen(str);
 549         start_len = strlen(start);
 550
 551         if (str_len >= start_len &&
 552                         !strncmp(str, start, start_len))
 553                 return 1;
 554
 555         return 0;
 556 }
 557
 558 /* check hardware */
 559 static int acerhdf_check_hardware(void)
 560 {
 561         char const *vendor, *version, *product;
 562         const struct bios_settings_t *bt = NULL;
 563
 564         /* get BIOS data */
 565         vendor  = dmi_get_system_info(DMI_SYS_VENDOR);
 566         version = dmi_get_system_info(DMI_BIOS_VERSION);
 567         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 568
 569         if (!vendor || !version || !product) {
 570                 pr_err("error getting hardware information\n");
 571                 return -EINVAL;
 572         }
 573
 574         pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
 575
 576         if (force_bios[0]) {
 577                 version = force_bios;
 578                 pr_info("forcing BIOS version: %s\n", version);
 579                 kernelmode = 0;
 580         }
 581
 582         if (force_product[0]) {
 583                 product = force_product;
 584                 pr_info("forcing BIOS product: %s\n", product);
 585                 kernelmode = 0;
 586         }
 587
 588         if (verbose)
 589                 pr_info("BIOS info: %s %s, product: %s\n",
 590                         vendor, version, product);
 591
 592         /* search BIOS version and vendor in BIOS settings table */
 593         for (bt = bios_tbl; bt->vendor[0]; bt++) {
 594                 /*
 595                  * check if actual hardware BIOS vendor, product and version
 596                  * IDs start with the strings of BIOS table entry
 597                  */
 598                 if (str_starts_with(vendor, bt->vendor) &&
 599                                 str_starts_with(product, bt->product) &&
 600                                 str_starts_with(version, bt->version)) {
 601                         bios_cfg = bt;
 602                         break;
 603                 }
 604         }
 605
 606         if (!bios_cfg) {
 607                 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n",
 608                        vendor, product, version);
 609                 return -EINVAL;
 610         }
 611
 612         /*
 613          * if started with kernel mode off, prevent the kernel from switching
 614          * off the fan
 615          */
 616         if (!kernelmode) {
 617                 pr_notice("Fan control off, to enable do:\n");
 618                 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zone0/mode\n");
 619         }
 620
 621         return 0;
 622 }
 623
 624 static int acerhdf_register_platform(void)
 625 {
 626         int err = 0;
 627
 628         err = platform_driver_register(&acerhdf_driver);
 629         if (err)
 630                 return err;
 631
 632         acerhdf_dev = platform_device_alloc("acerhdf", -1);
 633         if (!acerhdf_dev) {
 634                 err = -ENOMEM;
 635                 goto err_device_alloc;
 636         }
 637         err = platform_device_add(acerhdf_dev);
 638         if (err)
 639                 goto err_device_add;
 640
 641         return 0;
 642
 643 err_device_add:
 644         platform_device_put(acerhdf_dev);
 645 err_device_alloc:
 646         platform_driver_unregister(&acerhdf_driver);
 647         return err;
 648 }
 649
 650 static void acerhdf_unregister_platform(void)
 651 {
 652         platform_device_unregister(acerhdf_dev);
 653         platform_driver_unregister(&acerhdf_driver);
 654 }
 655
 656 static int acerhdf_register_thermal(void)
 657 {
 658         cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
 659                                                  &acerhdf_cooling_ops);
 660
 661         if (IS_ERR(cl_dev))
 662                 return -EINVAL;
 663
 664         thz_dev = thermal_zone_device_register("acerhdf", 1, 0, NULL,
 665                                               &acerhdf_dev_ops, NULL, 0,
 666                                               (kernelmode) ? interval*1000 : 0);
 667         if (IS_ERR(thz_dev))
 668                 return -EINVAL;
 669
 670         return 0;
 671 }
 672
 673 static void acerhdf_unregister_thermal(void)
 674 {
 675         if (cl_dev) {
 676                 thermal_cooling_device_unregister(cl_dev);
 677                 cl_dev = NULL;
 678         }
 679
 680         if (thz_dev) {
 681                 thermal_zone_device_unregister(thz_dev);
 682                 thz_dev = NULL;
 683         }
 684 }
 685
 686 static int __init acerhdf_init(void)
 687 {
 688         int err = 0;
 689
 690         err = acerhdf_check_hardware();
 691         if (err)
 692                 goto out_err;
 693
 694         err = acerhdf_register_platform();
 695         if (err)
 696                 goto out_err;
 697
 698         err = acerhdf_register_thermal();
 699         if (err)
 700                 goto err_unreg;
 701
 702         return 0;
 703
 704 err_unreg:
 705         acerhdf_unregister_thermal();
 706         acerhdf_unregister_platform();
 707
 708 out_err:
 709         return err;
 710 }
 711
 712 static void __exit acerhdf_exit(void)
 713 {
 714         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 715         acerhdf_unregister_thermal();
 716         acerhdf_unregister_platform();
 717 }
 718
 719 MODULE_LICENSE("GPL");
 720 MODULE_AUTHOR("Peter Feuerer");
 721 MODULE_DESCRIPTION("Aspire One temperature and fan driver");
 722 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
 723 MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:");
 724 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:");
 725 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:");
 726 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:");
 727 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
 728 MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:");
 729 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
 730 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
 731 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:");
 732 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:");
 733 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:");
 734 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:");
 735 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:");
 736 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:");
 737
 738 module_init(acerhdf_init);
 739 module_exit(acerhdf_exit);