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 "0.7.0"
  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 struct manualcmd {
 123         u8 mreg;
 124         u8 moff;
 125 };
 126
 127 /* default register and command to disable fan in manual mode */
 128 static const struct manualcmd mcmd = {
 129         .mreg = 0x94,
 130         .moff = 0xff,
 131 };
 132
 133 /* BIOS settings */
 134 struct bios_settings {
 135         const char *vendor;
 136         const char *product;
 137         const char *version;
 138         u8 fanreg;
 139         u8 tempreg;
 140         struct fancmd cmd;
 141         int mcmd_enable;
 142 };
 143
 144 /* Register addresses and values for different BIOS versions */
 145 static const struct bios_settings bios_tbl[] = {
 146         /* AOA110 */
 147         {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00}, 0},
 148         {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0},
 149         {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00}, 0},
 150         {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00}, 0},
 151         {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00}, 0},
 152         {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00}, 0},
 153         {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00}, 0},
 154         {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00}, 0},
 155         {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00}, 0},
 156         /* AOA150 */
 157         {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0},
 158         {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00}, 0},
 159         {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0},
 160         {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00}, 0},
 161         {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00}, 0},
 162         {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00}, 0},
 163         {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00}, 0},
 164         {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0},
 165         /* LT1005u */
 166         {"Acer", "LT-10Q", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0},
 167         /* Acer 1410 */
 168         {"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
 169         {"Acer", "Aspire 1410", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
 170         {"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
 171         {"Acer", "Aspire 1410", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
 172         {"Acer", "Aspire 1410", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
 173         {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
 174         {"Acer", "Aspire 1410", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
 175         {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
 176         {"Acer", "Aspire 1410", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
 177         {"Acer", "Aspire 1410", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
 178         {"Acer", "Aspire 1410", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
 179         /* Acer 1810xx */
 180         {"Acer", "Aspire 1810TZ", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
 181         {"Acer", "Aspire 1810T",  "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
 182         {"Acer", "Aspire 1810TZ", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
 183         {"Acer", "Aspire 1810T",  "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
 184         {"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
 185         {"Acer", "Aspire 1810T",  "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
 186         {"Acer", "Aspire 1810TZ", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
 187         {"Acer", "Aspire 1810T",  "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
 188         {"Acer", "Aspire 1810TZ", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
 189         {"Acer", "Aspire 1810T",  "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
 190         {"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
 191         {"Acer", "Aspire 1810T",  "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
 192         {"Acer", "Aspire 1810TZ", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
 193         {"Acer", "Aspire 1810T",  "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
 194         {"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
 195         {"Acer", "Aspire 1810T",  "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
 196         {"Acer", "Aspire 1810TZ", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
 197         {"Acer", "Aspire 1810T",  "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
 198         {"Acer", "Aspire 1810TZ", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
 199         {"Acer", "Aspire 1810T",  "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
 200         {"Acer", "Aspire 1810TZ", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
 201         {"Acer", "Aspire 1810T",  "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
 202         /* Acer 5755G */
 203         {"Acer", "Aspire 5755G",  "V1.20",   0xab, 0xb4, {0x00, 0x08}, 0},
 204         {"Acer", "Aspire 5755G",  "V1.21",   0xab, 0xb3, {0x00, 0x08}, 0},
 205         /* Acer 521 */
 206         {"Acer", "AO521", "V1.11", 0x55, 0x58, {0x1f, 0x00}, 0},
 207         /* Acer 531 */
 208         {"Acer", "AO531h", "v0.3104", 0x55, 0x58, {0x20, 0x00}, 0},
 209         {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00}, 0},
 210         {"Acer", "AO531h", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0},
 211         /* Acer 751 */
 212         {"Acer", "AO751h", "V0.3206", 0x55, 0x58, {0x21, 0x00}, 0},
 213         {"Acer", "AO751h", "V0.3212", 0x55, 0x58, {0x21, 0x00}, 0},
 214         /* Acer 753 */
 215         {"Acer", "Aspire One 753", "V1.24", 0x93, 0xac, {0x14, 0x04}, 1},
 216         /* Acer 1825 */
 217         {"Acer", "Aspire 1825PTZ", "V1.3118", 0x55, 0x58, {0x9e, 0x00}, 0},
 218         {"Acer", "Aspire 1825PTZ", "V1.3127", 0x55, 0x58, {0x9e, 0x00}, 0},
 219         /* Acer Extensa 5420 */
 220         {"Acer", "Extensa 5420", "V1.17", 0x93, 0xac, {0x14, 0x04}, 1},
 221         /* Acer Aspire 5315 */
 222         {"Acer", "Aspire 5315", "V1.19", 0x93, 0xac, {0x14, 0x04}, 1},
 223         /* Acer Aspire 5739 */
 224         {"Acer", "Aspire 5739G", "V1.3311", 0x55, 0x58, {0x20, 0x00}, 0},
 225         /* Acer TravelMate 7730 */
 226         {"Acer", "TravelMate 7730G", "v0.3509", 0x55, 0x58, {0xaf, 0x00}, 0},
 227         /* Acer TravelMate TM8573T */
 228         {"Acer", "TM8573T", "V1.13", 0x93, 0xa8, {0x14, 0x04}, 1},
 229         /* Gateway */
 230         {"Gateway", "AOA110", "v0.3103",  0x55, 0x58, {0x21, 0x00}, 0},
 231         {"Gateway", "AOA150", "v0.3103",  0x55, 0x58, {0x20, 0x00}, 0},
 232         {"Gateway", "LT31",   "v1.3103",  0x55, 0x58, {0x9e, 0x00}, 0},
 233         {"Gateway", "LT31",   "v1.3201",  0x55, 0x58, {0x9e, 0x00}, 0},
 234         {"Gateway", "LT31",   "v1.3302",  0x55, 0x58, {0x9e, 0x00}, 0},
 235         {"Gateway", "LT31",   "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0},
 236         /* Packard Bell */
 237         {"Packard Bell", "DOA150",  "v0.3104",  0x55, 0x58, {0x21, 0x00}, 0},
 238         {"Packard Bell", "DOA150",  "v0.3105",  0x55, 0x58, {0x20, 0x00}, 0},
 239         {"Packard Bell", "AOA110",  "v0.3105",  0x55, 0x58, {0x21, 0x00}, 0},
 240         {"Packard Bell", "AOA150",  "v0.3105",  0x55, 0x58, {0x20, 0x00}, 0},
 241         {"Packard Bell", "ENBFT",   "V1.3118",  0x55, 0x58, {0x9e, 0x00}, 0},
 242         {"Packard Bell", "ENBFT",   "V1.3127",  0x55, 0x58, {0x9e, 0x00}, 0},
 243         {"Packard Bell", "DOTMU",   "v1.3303",  0x55, 0x58, {0x9e, 0x00}, 0},
 244         {"Packard Bell", "DOTMU",   "v0.3120",  0x55, 0x58, {0x9e, 0x00}, 0},
 245         {"Packard Bell", "DOTMU",   "v0.3108",  0x55, 0x58, {0x9e, 0x00}, 0},
 246         {"Packard Bell", "DOTMU",   "v0.3113",  0x55, 0x58, {0x9e, 0x00}, 0},
 247         {"Packard Bell", "DOTMU",   "v0.3115",  0x55, 0x58, {0x9e, 0x00}, 0},
 248         {"Packard Bell", "DOTMU",   "v0.3117",  0x55, 0x58, {0x9e, 0x00}, 0},
 249         {"Packard Bell", "DOTMU",   "v0.3119",  0x55, 0x58, {0x9e, 0x00}, 0},
 250         {"Packard Bell", "DOTMU",   "v1.3204",  0x55, 0x58, {0x9e, 0x00}, 0},
 251         {"Packard Bell", "DOTMA",   "v1.3201",  0x55, 0x58, {0x9e, 0x00}, 0},
 252         {"Packard Bell", "DOTMA",   "v1.3302",  0x55, 0x58, {0x9e, 0x00}, 0},
 253         {"Packard Bell", "DOTMA",   "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0},
 254         {"Packard Bell", "DOTVR46", "v1.3308",  0x55, 0x58, {0x9e, 0x00}, 0},
 255         /* pewpew-terminator */
 256         {"", "", "", 0, 0, {0, 0}, 0}
 257 };
 258
 259 static const struct bios_settings *bios_cfg __read_mostly;
 260
 261 /*
 262  * this struct is used to instruct thermal layer to use bang_bang instead of
 263  * default governor for acerhdf
 264  */
 265 static struct thermal_zone_params acerhdf_zone_params = {
 266         .governor_name = "bang_bang",
 267 };
 268
 269 static int acerhdf_get_temp(int *temp)
 270 {
 271         u8 read_temp;
 272
 273         if (ec_read(bios_cfg->tempreg, &read_temp))
 274                 return -EINVAL;
 275
 276         *temp = read_temp * 1000;
 277
 278         return 0;
 279 }
 280
 281 static int acerhdf_get_fanstate(int *state)
 282 {
 283         u8 fan;
 284
 285         if (ec_read(bios_cfg->fanreg, &fan))
 286                 return -EINVAL;
 287
 288         if (fan != bios_cfg->cmd.cmd_off)
 289                 *state = ACERHDF_FAN_AUTO;
 290         else
 291                 *state = ACERHDF_FAN_OFF;
 292
 293         return 0;
 294 }
 295
 296 static void acerhdf_change_fanstate(int state)
 297 {
 298         unsigned char cmd;
 299
 300         if (verbose)
 301                 pr_notice("fan %s\n", state == ACERHDF_FAN_OFF ? "OFF" : "ON");
 302
 303         if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
 304                 pr_err("invalid fan state %d requested, setting to auto!\n",
 305                        state);
 306                 state = ACERHDF_FAN_AUTO;
 307         }
 308
 309         cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off
 310                                          : bios_cfg->cmd.cmd_auto;
 311         fanstate = state;
 312
 313         ec_write(bios_cfg->fanreg, cmd);
 314
 315         if (bios_cfg->mcmd_enable && state == ACERHDF_FAN_OFF) {
 316                 if (verbose)
 317                         pr_notice("turning off fan manually\n");
 318                 ec_write(mcmd.mreg, mcmd.moff);
 319         }
 320 }
 321
 322 static void acerhdf_check_param(struct thermal_zone_device *thermal)
 323 {
 324         if (fanon > ACERHDF_MAX_FANON) {
 325                 pr_err("fanon temperature too high, set to %d\n",
 326                        ACERHDF_MAX_FANON);
 327                 fanon = ACERHDF_MAX_FANON;
 328         }
 329
 330         if (kernelmode && prev_interval != interval) {
 331                 if (interval > ACERHDF_MAX_INTERVAL) {
 332                         pr_err("interval too high, set to %d\n",
 333                                ACERHDF_MAX_INTERVAL);
 334                         interval = ACERHDF_MAX_INTERVAL;
 335                 }
 336                 if (verbose)
 337                         pr_notice("interval changed to: %d\n", interval);
 338                 thermal->polling_delay = interval*1000;
 339                 prev_interval = interval;
 340         }
 341 }
 342
 343 /*
 344  * This is the thermal zone callback which does the delayed polling of the fan
 345  * state. We do check /sysfs-originating settings here in acerhdf_check_param()
 346  * as late as the polling interval is since we can't do that in the respective
 347  * accessors of the module parameters.
 348  */
 349 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal,
 350                                unsigned long *t)
 351 {
 352         int temp, err = 0;
 353
 354         acerhdf_check_param(thermal);
 355
 356         err = acerhdf_get_temp(&temp);
 357         if (err)
 358                 return err;
 359
 360         if (verbose)
 361                 pr_notice("temp %d\n", temp);
 362
 363         *t = temp;
 364         return 0;
 365 }
 366
 367 static int acerhdf_bind(struct thermal_zone_device *thermal,
 368                         struct thermal_cooling_device *cdev)
 369 {
 370         /* if the cooling device is the one from acerhdf bind it */
 371         if (cdev != cl_dev)
 372                 return 0;
 373
 374         if (thermal_zone_bind_cooling_device(thermal, 0, cdev,
 375                         THERMAL_NO_LIMIT, THERMAL_NO_LIMIT)) {
 376                 pr_err("error binding cooling dev\n");
 377                 return -EINVAL;
 378         }
 379         return 0;
 380 }
 381
 382 static int acerhdf_unbind(struct thermal_zone_device *thermal,
 383                           struct thermal_cooling_device *cdev)
 384 {
 385         if (cdev != cl_dev)
 386                 return 0;
 387
 388         if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
 389                 pr_err("error unbinding cooling dev\n");
 390                 return -EINVAL;
 391         }
 392         return 0;
 393 }
 394
 395 static inline void acerhdf_revert_to_bios_mode(void)
 396 {
 397         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 398         kernelmode = 0;
 399         if (thz_dev)
 400                 thz_dev->polling_delay = 0;
 401         pr_notice("kernel mode fan control OFF\n");
 402 }
 403 static inline void acerhdf_enable_kernelmode(void)
 404 {
 405         kernelmode = 1;
 406
 407         thz_dev->polling_delay = interval*1000;
 408         thermal_zone_device_update(thz_dev);
 409         pr_notice("kernel mode fan control ON\n");
 410 }
 411
 412 static int acerhdf_get_mode(struct thermal_zone_device *thermal,
 413                             enum thermal_device_mode *mode)
 414 {
 415         if (verbose)
 416                 pr_notice("kernel mode fan control %d\n", kernelmode);
 417
 418         *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED
 419                              : THERMAL_DEVICE_DISABLED;
 420
 421         return 0;
 422 }
 423
 424 /*
 425  * set operation mode;
 426  * enabled: the thermal layer of the kernel takes care about
 427  *          the temperature and the fan.
 428  * disabled: the BIOS takes control of the fan.
 429  */
 430 static int acerhdf_set_mode(struct thermal_zone_device *thermal,
 431                             enum thermal_device_mode mode)
 432 {
 433         if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
 434                 acerhdf_revert_to_bios_mode();
 435         else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
 436                 acerhdf_enable_kernelmode();
 437
 438         return 0;
 439 }
 440
 441 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
 442                                  enum thermal_trip_type *type)
 443 {
 444         if (trip == 0)
 445                 *type = THERMAL_TRIP_ACTIVE;
 446         else if (trip == 1)
 447                 *type = THERMAL_TRIP_CRITICAL;
 448         else
 449                 return -EINVAL;
 450
 451         return 0;
 452 }
 453
 454 static int acerhdf_get_trip_hyst(struct thermal_zone_device *thermal, int trip,
 455                                  unsigned long *temp)
 456 {
 457         if (trip != 0)
 458                 return -EINVAL;
 459
 460         *temp = fanon - fanoff;
 461
 462         return 0;
 463 }
 464
 465 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
 466                                  unsigned long *temp)
 467 {
 468         if (trip == 0)
 469                 *temp = fanon;
 470         else if (trip == 1)
 471                 *temp = ACERHDF_TEMP_CRIT;
 472         else
 473                 return -EINVAL;
 474
 475         return 0;
 476 }
 477
 478 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
 479                                  unsigned long *temperature)
 480 {
 481         *temperature = ACERHDF_TEMP_CRIT;
 482         return 0;
 483 }
 484
 485 /* bind callback functions to thermalzone */
 486 static struct thermal_zone_device_ops acerhdf_dev_ops = {
 487         .bind = acerhdf_bind,
 488         .unbind = acerhdf_unbind,
 489         .get_temp = acerhdf_get_ec_temp,
 490         .get_mode = acerhdf_get_mode,
 491         .set_mode = acerhdf_set_mode,
 492         .get_trip_type = acerhdf_get_trip_type,
 493         .get_trip_hyst = acerhdf_get_trip_hyst,
 494         .get_trip_temp = acerhdf_get_trip_temp,
 495         .get_crit_temp = acerhdf_get_crit_temp,
 496 };
 497
 498
 499 /*
 500  * cooling device callback functions
 501  * get maximal fan cooling state
 502  */
 503 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
 504                                  unsigned long *state)
 505 {
 506         *state = 1;
 507
 508         return 0;
 509 }
 510
 511 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
 512                                  unsigned long *state)
 513 {
 514         int err = 0, tmp;
 515
 516         err = acerhdf_get_fanstate(&tmp);
 517         if (err)
 518                 return err;
 519
 520         *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
 521         return 0;
 522 }
 523
 524 /* change current fan state - is overwritten when running in kernel mode */
 525 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
 526                                  unsigned long state)
 527 {
 528         int cur_temp, cur_state, err = 0;
 529
 530         if (!kernelmode)
 531                 return 0;
 532
 533         err = acerhdf_get_temp(&cur_temp);
 534         if (err) {
 535                 pr_err("error reading temperature, hand off control to BIOS\n");
 536                 goto err_out;
 537         }
 538
 539         err = acerhdf_get_fanstate(&cur_state);
 540         if (err) {
 541                 pr_err("error reading fan state, hand off control to BIOS\n");
 542                 goto err_out;
 543         }
 544
 545         if (state == 0) {
 546                 if (cur_state == ACERHDF_FAN_AUTO)
 547                         acerhdf_change_fanstate(ACERHDF_FAN_OFF);
 548         } else {
 549                 if (cur_state == ACERHDF_FAN_OFF)
 550                         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 551         }
 552         return 0;
 553
 554 err_out:
 555         acerhdf_revert_to_bios_mode();
 556         return -EINVAL;
 557 }
 558
 559 /* bind fan callbacks to fan device */
 560 static struct thermal_cooling_device_ops acerhdf_cooling_ops = {
 561         .get_max_state = acerhdf_get_max_state,
 562         .get_cur_state = acerhdf_get_cur_state,
 563         .set_cur_state = acerhdf_set_cur_state,
 564 };
 565
 566 /* suspend / resume functionality */
 567 static int acerhdf_suspend(struct device *dev)
 568 {
 569         if (kernelmode)
 570                 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 571
 572         if (verbose)
 573                 pr_notice("going suspend\n");
 574
 575         return 0;
 576 }
 577
 578 static int acerhdf_probe(struct platform_device *device)
 579 {
 580         return 0;
 581 }
 582
 583 static int acerhdf_remove(struct platform_device *device)
 584 {
 585         return 0;
 586 }
 587
 588 static const struct dev_pm_ops acerhdf_pm_ops = {
 589         .suspend = acerhdf_suspend,
 590         .freeze  = acerhdf_suspend,
 591 };
 592
 593 static struct platform_driver acerhdf_driver = {
 594         .driver = {
 595                 .name  = "acerhdf",
 596                 .pm    = &acerhdf_pm_ops,
 597         },
 598         .probe = acerhdf_probe,
 599         .remove = acerhdf_remove,
 600 };
 601
 602 /* checks if str begins with start */
 603 static int str_starts_with(const char *str, const char *start)
 604 {
 605         unsigned long str_len = 0, start_len = 0;
 606
 607         str_len = strlen(str);
 608         start_len = strlen(start);
 609
 610         if (str_len >= start_len &&
 611                         !strncmp(str, start, start_len))
 612                 return 1;
 613
 614         return 0;
 615 }
 616
 617 /* check hardware */
 618 static int acerhdf_check_hardware(void)
 619 {
 620         char const *vendor, *version, *product;
 621         const struct bios_settings *bt = NULL;
 622
 623         /* get BIOS data */
 624         vendor  = dmi_get_system_info(DMI_SYS_VENDOR);
 625         version = dmi_get_system_info(DMI_BIOS_VERSION);
 626         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 627
 628         if (!vendor || !version || !product) {
 629                 pr_err("error getting hardware information\n");
 630                 return -EINVAL;
 631         }
 632
 633         pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
 634
 635         if (force_bios[0]) {
 636                 version = force_bios;
 637                 pr_info("forcing BIOS version: %s\n", version);
 638                 kernelmode = 0;
 639         }
 640
 641         if (force_product[0]) {
 642                 product = force_product;
 643                 pr_info("forcing BIOS product: %s\n", product);
 644                 kernelmode = 0;
 645         }
 646
 647         if (verbose)
 648                 pr_info("BIOS info: %s %s, product: %s\n",
 649                         vendor, version, product);
 650
 651         /* search BIOS version and vendor in BIOS settings table */
 652         for (bt = bios_tbl; bt->vendor[0]; bt++) {
 653                 /*
 654                  * check if actual hardware BIOS vendor, product and version
 655                  * IDs start with the strings of BIOS table entry
 656                  */
 657                 if (str_starts_with(vendor, bt->vendor) &&
 658                                 str_starts_with(product, bt->product) &&
 659                                 str_starts_with(version, bt->version)) {
 660                         bios_cfg = bt;
 661                         break;
 662                 }
 663         }
 664
 665         if (!bios_cfg) {
 666                 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n",
 667                        vendor, product, version);
 668                 return -EINVAL;
 669         }
 670
 671         /*
 672          * if started with kernel mode off, prevent the kernel from switching
 673          * off the fan
 674          */
 675         if (!kernelmode) {
 676                 pr_notice("Fan control off, to enable do:\n");
 677                 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zone0/mode\n");
 678         }
 679
 680         return 0;
 681 }
 682
 683 static int acerhdf_register_platform(void)
 684 {
 685         int err = 0;
 686
 687         err = platform_driver_register(&acerhdf_driver);
 688         if (err)
 689                 return err;
 690
 691         acerhdf_dev = platform_device_alloc("acerhdf", -1);
 692         if (!acerhdf_dev) {
 693                 err = -ENOMEM;
 694                 goto err_device_alloc;
 695         }
 696         err = platform_device_add(acerhdf_dev);
 697         if (err)
 698                 goto err_device_add;
 699
 700         return 0;
 701
 702 err_device_add:
 703         platform_device_put(acerhdf_dev);
 704 err_device_alloc:
 705         platform_driver_unregister(&acerhdf_driver);
 706         return err;
 707 }
 708
 709 static void acerhdf_unregister_platform(void)
 710 {
 711         platform_device_unregister(acerhdf_dev);
 712         platform_driver_unregister(&acerhdf_driver);
 713 }
 714
 715 static int acerhdf_register_thermal(void)
 716 {
 717         cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
 718                                                  &acerhdf_cooling_ops);
 719
 720         if (IS_ERR(cl_dev))
 721                 return -EINVAL;
 722
 723         thz_dev = thermal_zone_device_register("acerhdf", 2, 0, NULL,
 724                                               &acerhdf_dev_ops,
 725                                               &acerhdf_zone_params, 0,
 726                                               (kernelmode) ? interval*1000 : 0);
 727         if (IS_ERR(thz_dev))
 728                 return -EINVAL;
 729
 730         if (strcmp(thz_dev->governor->name,
 731                                 acerhdf_zone_params.governor_name)) {
 732                 pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n",
 733                                 acerhdf_zone_params.governor_name);
 734                 return -EINVAL;
 735         }
 736
 737         return 0;
 738 }
 739
 740 static void acerhdf_unregister_thermal(void)
 741 {
 742         if (cl_dev) {
 743                 thermal_cooling_device_unregister(cl_dev);
 744                 cl_dev = NULL;
 745         }
 746
 747         if (thz_dev) {
 748                 thermal_zone_device_unregister(thz_dev);
 749                 thz_dev = NULL;
 750         }
 751 }
 752
 753 static int __init acerhdf_init(void)
 754 {
 755         int err = 0;
 756
 757         err = acerhdf_check_hardware();
 758         if (err)
 759                 goto out_err;
 760
 761         err = acerhdf_register_platform();
 762         if (err)
 763                 goto out_err;
 764
 765         err = acerhdf_register_thermal();
 766         if (err)
 767                 goto err_unreg;
 768
 769         return 0;
 770
 771 err_unreg:
 772         acerhdf_unregister_thermal();
 773         acerhdf_unregister_platform();
 774
 775 out_err:
 776         return err;
 777 }
 778
 779 static void __exit acerhdf_exit(void)
 780 {
 781         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 782         acerhdf_unregister_thermal();
 783         acerhdf_unregister_platform();
 784 }
 785
 786 MODULE_LICENSE("GPL");
 787 MODULE_AUTHOR("Peter Feuerer");
 788 MODULE_DESCRIPTION("Aspire One temperature and fan driver");
 789 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
 790 MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:");
 791 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:");
 792 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:");
 793 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5755G:");
 794 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:");
 795 MODULE_ALIAS("dmi:*:*Acer*:pnAO521*:");
 796 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
 797 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5739G:");
 798 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*One*753:");
 799 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5315:");
 800 MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:");
 801 MODULE_ALIAS("dmi:*:*Acer*:TM8573T:");
 802 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
 803 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
 804 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:");
 805 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:");
 806 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:");
 807 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:");
 808 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:");
 809 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:");
 810 MODULE_ALIAS("dmi:*:*Acer*:pnExtensa 5420*:");
 811
 812 module_init(acerhdf_init);
 813 module_exit(acerhdf_exit);