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/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                 pr_err("error binding cooling dev\n");
 334                 return -EINVAL;
 335         }
 336         return 0;
 337 }
 338
 339 static int acerhdf_unbind(struct thermal_zone_device *thermal,
 340                           struct thermal_cooling_device *cdev)
 341 {
 342         if (cdev != cl_dev)
 343                 return 0;
 344
 345         if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
 346                 pr_err("error unbinding cooling dev\n");
 347                 return -EINVAL;
 348         }
 349         return 0;
 350 }
 351
 352 static inline void acerhdf_revert_to_bios_mode(void)
 353 {
 354         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 355         kernelmode = 0;
 356         if (thz_dev)
 357                 thz_dev->polling_delay = 0;
 358         pr_notice("kernel mode fan control OFF\n");
 359 }
 360 static inline void acerhdf_enable_kernelmode(void)
 361 {
 362         kernelmode = 1;
 363
 364         thz_dev->polling_delay = interval*1000;
 365         thermal_zone_device_update(thz_dev);
 366         pr_notice("kernel mode fan control ON\n");
 367 }
 368
 369 static int acerhdf_get_mode(struct thermal_zone_device *thermal,
 370                             enum thermal_device_mode *mode)
 371 {
 372         if (verbose)
 373                 pr_notice("kernel mode fan control %d\n", kernelmode);
 374
 375         *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED
 376                              : THERMAL_DEVICE_DISABLED;
 377
 378         return 0;
 379 }
 380
 381 /*
 382  * set operation mode;
 383  * enabled: the thermal layer of the kernel takes care about
 384  *          the temperature and the fan.
 385  * disabled: the BIOS takes control of the fan.
 386  */
 387 static int acerhdf_set_mode(struct thermal_zone_device *thermal,
 388                             enum thermal_device_mode mode)
 389 {
 390         if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
 391                 acerhdf_revert_to_bios_mode();
 392         else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
 393                 acerhdf_enable_kernelmode();
 394
 395         return 0;
 396 }
 397
 398 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
 399                                  enum thermal_trip_type *type)
 400 {
 401         if (trip == 0)
 402                 *type = THERMAL_TRIP_ACTIVE;
 403
 404         return 0;
 405 }
 406
 407 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
 408                                  unsigned long *temp)
 409 {
 410         if (trip == 0)
 411                 *temp = fanon;
 412
 413         return 0;
 414 }
 415
 416 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
 417                                  unsigned long *temperature)
 418 {
 419         *temperature = ACERHDF_TEMP_CRIT;
 420         return 0;
 421 }
 422
 423 /* bind callback functions to thermalzone */
 424 static struct thermal_zone_device_ops acerhdf_dev_ops = {
 425         .bind = acerhdf_bind,
 426         .unbind = acerhdf_unbind,
 427         .get_temp = acerhdf_get_ec_temp,
 428         .get_mode = acerhdf_get_mode,
 429         .set_mode = acerhdf_set_mode,
 430         .get_trip_type = acerhdf_get_trip_type,
 431         .get_trip_temp = acerhdf_get_trip_temp,
 432         .get_crit_temp = acerhdf_get_crit_temp,
 433 };
 434
 435
 436 /*
 437  * cooling device callback functions
 438  * get maximal fan cooling state
 439  */
 440 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
 441                                  unsigned long *state)
 442 {
 443         *state = 1;
 444
 445         return 0;
 446 }
 447
 448 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
 449                                  unsigned long *state)
 450 {
 451         int err = 0, tmp;
 452
 453         err = acerhdf_get_fanstate(&tmp);
 454         if (err)
 455                 return err;
 456
 457         *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
 458         return 0;
 459 }
 460
 461 /* change current fan state - is overwritten when running in kernel mode */
 462 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
 463                                  unsigned long state)
 464 {
 465         int cur_temp, cur_state, err = 0;
 466
 467         if (!kernelmode)
 468                 return 0;
 469
 470         err = acerhdf_get_temp(&cur_temp);
 471         if (err) {
 472                 pr_err("error reading temperature, hand off control to BIOS\n");
 473                 goto err_out;
 474         }
 475
 476         err = acerhdf_get_fanstate(&cur_state);
 477         if (err) {
 478                 pr_err("error reading fan state, hand off control to BIOS\n");
 479                 goto err_out;
 480         }
 481
 482         if (state == 0) {
 483                 /* turn fan off only if below fanoff temperature */
 484                 if ((cur_state == ACERHDF_FAN_AUTO) &&
 485                     (cur_temp < fanoff))
 486                         acerhdf_change_fanstate(ACERHDF_FAN_OFF);
 487         } else {
 488                 if (cur_state == ACERHDF_FAN_OFF)
 489                         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 490         }
 491         return 0;
 492
 493 err_out:
 494         acerhdf_revert_to_bios_mode();
 495         return -EINVAL;
 496 }
 497
 498 /* bind fan callbacks to fan device */
 499 static struct thermal_cooling_device_ops acerhdf_cooling_ops = {
 500         .get_max_state = acerhdf_get_max_state,
 501         .get_cur_state = acerhdf_get_cur_state,
 502         .set_cur_state = acerhdf_set_cur_state,
 503 };
 504
 505 /* suspend / resume functionality */
 506 static int acerhdf_suspend(struct device *dev)
 507 {
 508         if (kernelmode)
 509                 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 510
 511         if (verbose)
 512                 pr_notice("going suspend\n");
 513
 514         return 0;
 515 }
 516
 517 static int __devinit acerhdf_probe(struct platform_device *device)
 518 {
 519         return 0;
 520 }
 521
 522 static int acerhdf_remove(struct platform_device *device)
 523 {
 524         return 0;
 525 }
 526
 527 static const struct dev_pm_ops acerhdf_pm_ops = {
 528         .suspend = acerhdf_suspend,
 529         .freeze  = acerhdf_suspend,
 530 };
 531
 532 static struct platform_driver acerhdf_driver = {
 533         .driver = {
 534                 .name  = "acerhdf",
 535                 .owner = THIS_MODULE,
 536                 .pm    = &acerhdf_pm_ops,
 537         },
 538         .probe = acerhdf_probe,
 539         .remove = acerhdf_remove,
 540 };
 541
 542 /* checks if str begins with start */
 543 static int str_starts_with(const char *str, const char *start)
 544 {
 545         unsigned long str_len = 0, start_len = 0;
 546
 547         str_len = strlen(str);
 548         start_len = strlen(start);
 549
 550         if (str_len >= start_len &&
 551                         !strncmp(str, start, start_len))
 552                 return 1;
 553
 554         return 0;
 555 }
 556
 557 /* check hardware */
 558 static int acerhdf_check_hardware(void)
 559 {
 560         char const *vendor, *version, *product;
 561         const struct bios_settings_t *bt = NULL;
 562
 563         /* get BIOS data */
 564         vendor  = dmi_get_system_info(DMI_SYS_VENDOR);
 565         version = dmi_get_system_info(DMI_BIOS_VERSION);
 566         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 567
 568         if (!vendor || !version || !product) {
 569                 pr_err("error getting hardware information\n");
 570                 return -EINVAL;
 571         }
 572
 573         pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
 574
 575         if (force_bios[0]) {
 576                 version = force_bios;
 577                 pr_info("forcing BIOS version: %s\n", version);
 578                 kernelmode = 0;
 579         }
 580
 581         if (force_product[0]) {
 582                 product = force_product;
 583                 pr_info("forcing BIOS product: %s\n", product);
 584                 kernelmode = 0;
 585         }
 586
 587         if (verbose)
 588                 pr_info("BIOS info: %s %s, product: %s\n",
 589                         vendor, version, product);
 590
 591         /* search BIOS version and vendor in BIOS settings table */
 592         for (bt = bios_tbl; bt->vendor[0]; bt++) {
 593                 /*
 594                  * check if actual hardware BIOS vendor, product and version
 595                  * IDs start with the strings of BIOS table entry
 596                  */
 597                 if (str_starts_with(vendor, bt->vendor) &&
 598                                 str_starts_with(product, bt->product) &&
 599                                 str_starts_with(version, bt->version)) {
 600                         bios_cfg = bt;
 601                         break;
 602                 }
 603         }
 604
 605         if (!bios_cfg) {
 606                 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n",
 607                        vendor, product, version);
 608                 return -EINVAL;
 609         }
 610
 611         /*
 612          * if started with kernel mode off, prevent the kernel from switching
 613          * off the fan
 614          */
 615         if (!kernelmode) {
 616                 pr_notice("Fan control off, to enable do:\n");
 617                 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zone0/mode\n");
 618         }
 619
 620         return 0;
 621 }
 622
 623 static int acerhdf_register_platform(void)
 624 {
 625         int err = 0;
 626
 627         err = platform_driver_register(&acerhdf_driver);
 628         if (err)
 629                 return err;
 630
 631         acerhdf_dev = platform_device_alloc("acerhdf", -1);
 632         if (!acerhdf_dev) {
 633                 err = -ENOMEM;
 634                 goto err_device_alloc;
 635         }
 636         err = platform_device_add(acerhdf_dev);
 637         if (err)
 638                 goto err_device_add;
 639
 640         return 0;
 641
 642 err_device_add:
 643         platform_device_put(acerhdf_dev);
 644 err_device_alloc:
 645         platform_driver_unregister(&acerhdf_driver);
 646         return err;
 647 }
 648
 649 static void acerhdf_unregister_platform(void)
 650 {
 651         platform_device_unregister(acerhdf_dev);
 652         platform_driver_unregister(&acerhdf_driver);
 653 }
 654
 655 static int acerhdf_register_thermal(void)
 656 {
 657         cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
 658                                                  &acerhdf_cooling_ops);
 659
 660         if (IS_ERR(cl_dev))
 661                 return -EINVAL;
 662
 663         thz_dev = thermal_zone_device_register("acerhdf", 1, NULL,
 664                                               &acerhdf_dev_ops, 0, 0, 0,
 665                                               (kernelmode) ? interval*1000 : 0);
 666         if (IS_ERR(thz_dev))
 667                 return -EINVAL;
 668
 669         return 0;
 670 }
 671
 672 static void acerhdf_unregister_thermal(void)
 673 {
 674         if (cl_dev) {
 675                 thermal_cooling_device_unregister(cl_dev);
 676                 cl_dev = NULL;
 677         }
 678
 679         if (thz_dev) {
 680                 thermal_zone_device_unregister(thz_dev);
 681                 thz_dev = NULL;
 682         }
 683 }
 684
 685 static int __init acerhdf_init(void)
 686 {
 687         int err = 0;
 688
 689         err = acerhdf_check_hardware();
 690         if (err)
 691                 goto out_err;
 692
 693         err = acerhdf_register_platform();
 694         if (err)
 695                 goto out_err;
 696
 697         err = acerhdf_register_thermal();
 698         if (err)
 699                 goto err_unreg;
 700
 701         return 0;
 702
 703 err_unreg:
 704         acerhdf_unregister_thermal();
 705         acerhdf_unregister_platform();
 706
 707 out_err:
 708         return err;
 709 }
 710
 711 static void __exit acerhdf_exit(void)
 712 {
 713         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 714         acerhdf_unregister_thermal();
 715         acerhdf_unregister_platform();
 716 }
 717
 718 MODULE_LICENSE("GPL");
 719 MODULE_AUTHOR("Peter Feuerer");
 720 MODULE_DESCRIPTION("Aspire One temperature and fan driver");
 721 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
 722 MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:");
 723 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:");
 724 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:");
 725 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:");
 726 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
 727 MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:");
 728 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
 729 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
 730 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:");
 731 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:");
 732 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:");
 733 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:");
 734 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:");
 735 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:");
 736
 737 module_init(acerhdf_init);
 738 module_exit(acerhdf_exit);