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 list_supported;
  90 static unsigned int fanstate = ACERHDF_FAN_AUTO;
  91 static char force_bios[16];
  92 static char force_product[16];
  93 static unsigned int prev_interval;
  94 static struct thermal_zone_device *thz_dev;
  95 static struct thermal_cooling_device *cl_dev;
  96 static struct platform_device *acerhdf_dev;
  97
  98 module_param(kernelmode, uint, 0);
  99 MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off");
 100 module_param(interval, uint, 0600);
 101 MODULE_PARM_DESC(interval, "Polling interval of temperature check");
 102 module_param(fanon, uint, 0600);
 103 MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature");
 104 module_param(fanoff, uint, 0600);
 105 MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature");
 106 module_param(verbose, uint, 0600);
 107 MODULE_PARM_DESC(verbose, "Enable verbose dmesg output");
 108 module_param(list_supported, uint, 0600);
 109 MODULE_PARM_DESC(list_supported, "List supported models and BIOS versions");
 110 module_param_string(force_bios, force_bios, 16, 0);
 111 MODULE_PARM_DESC(force_bios, "Pretend system has this known supported BIOS version");
 112 module_param_string(force_product, force_product, 16, 0);
 113 MODULE_PARM_DESC(force_product, "Pretend system is this known supported model");
 114
 115 /*
 116  * cmd_off: to switch the fan completely off and check if the fan is off
 117  *      cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then
 118  *              the fan speed depending on the temperature
 119  */
 120 struct fancmd {
 121         u8 cmd_off;
 122         u8 cmd_auto;
 123 };
 124
 125 struct manualcmd {
 126         u8 mreg;
 127         u8 moff;
 128 };
 129
 130 /* default register and command to disable fan in manual mode */
 131 static const struct manualcmd mcmd = {
 132         .mreg = 0x94,
 133         .moff = 0xff,
 134 };
 135
 136 /* BIOS settings - only used during probe */
 137 struct bios_settings {
 138         const char *vendor;
 139         const char *product;
 140         const char *version;
 141         u8 fanreg;
 142         u8 tempreg;
 143         struct fancmd cmd;
 144         int mcmd_enable;
 145 };
 146
 147 /* This could be a daughter struct in the above, but not worth the redirect */
 148 struct ctrl_settings {
 149         u8 fanreg;
 150         u8 tempreg;
 151         struct fancmd cmd;
 152         int mcmd_enable;
 153 };
 154
 155 static struct ctrl_settings ctrl_cfg __read_mostly;
 156
 157 /* Register addresses and values for different BIOS versions */
 158 static const struct bios_settings bios_tbl[] __initconst = {
 159         /* AOA110 */
 160         {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00}, 0},
 161         {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0},
 162         {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00}, 0},
 163         {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00}, 0},
 164         {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00}, 0},
 165         {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00}, 0},
 166         {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00}, 0},
 167         {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00}, 0},
 168         {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00}, 0},
 169         /* AOA150 */
 170         {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0},
 171         {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00}, 0},
 172         {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0},
 173         {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00}, 0},
 174         {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00}, 0},
 175         {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00}, 0},
 176         {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00}, 0},
 177         {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0},
 178         /* LT1005u */
 179         {"Acer", "LT-10Q", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0},
 180         /* Acer 1410 */
 181         {"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
 182         {"Acer", "Aspire 1410", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
 183         {"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
 184         {"Acer", "Aspire 1410", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
 185         {"Acer", "Aspire 1410", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
 186         {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
 187         {"Acer", "Aspire 1410", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
 188         {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
 189         {"Acer", "Aspire 1410", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
 190         {"Acer", "Aspire 1410", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
 191         {"Acer", "Aspire 1410", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
 192         /* Acer 1810xx */
 193         {"Acer", "Aspire 1810TZ", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
 194         {"Acer", "Aspire 1810T",  "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
 195         {"Acer", "Aspire 1810TZ", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
 196         {"Acer", "Aspire 1810T",  "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
 197         {"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
 198         {"Acer", "Aspire 1810T",  "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
 199         {"Acer", "Aspire 1810TZ", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
 200         {"Acer", "Aspire 1810T",  "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
 201         {"Acer", "Aspire 1810TZ", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
 202         {"Acer", "Aspire 1810T",  "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
 203         {"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
 204         {"Acer", "Aspire 1810T",  "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
 205         {"Acer", "Aspire 1810TZ", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
 206         {"Acer", "Aspire 1810T",  "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
 207         {"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
 208         {"Acer", "Aspire 1810T",  "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
 209         {"Acer", "Aspire 1810TZ", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
 210         {"Acer", "Aspire 1810T",  "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
 211         {"Acer", "Aspire 1810TZ", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
 212         {"Acer", "Aspire 1810T",  "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
 213         {"Acer", "Aspire 1810TZ", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
 214         {"Acer", "Aspire 1810T",  "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
 215         /* Acer 5755G */
 216         {"Acer", "Aspire 5755G",  "V1.20",   0xab, 0xb4, {0x00, 0x08}, 0},
 217         {"Acer", "Aspire 5755G",  "V1.21",   0xab, 0xb3, {0x00, 0x08}, 0},
 218         /* Acer 521 */
 219         {"Acer", "AO521", "V1.11", 0x55, 0x58, {0x1f, 0x00}, 0},
 220         /* Acer 531 */
 221         {"Acer", "AO531h", "v0.3104", 0x55, 0x58, {0x20, 0x00}, 0},
 222         {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00}, 0},
 223         {"Acer", "AO531h", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0},
 224         /* Acer 751 */
 225         {"Acer", "AO751h", "V0.3206", 0x55, 0x58, {0x21, 0x00}, 0},
 226         {"Acer", "AO751h", "V0.3212", 0x55, 0x58, {0x21, 0x00}, 0},
 227         /* Acer 753 */
 228         {"Acer", "Aspire One 753", "V1.24", 0x93, 0xac, {0x14, 0x04}, 1},
 229         /* Acer 1825 */
 230         {"Acer", "Aspire 1825PTZ", "V1.3118", 0x55, 0x58, {0x9e, 0x00}, 0},
 231         {"Acer", "Aspire 1825PTZ", "V1.3127", 0x55, 0x58, {0x9e, 0x00}, 0},
 232         /* Acer Extensa 5420 */
 233         {"Acer", "Extensa 5420", "V1.17", 0x93, 0xac, {0x14, 0x04}, 1},
 234         /* Acer Aspire 5315 */
 235         {"Acer", "Aspire 5315", "V1.19", 0x93, 0xac, {0x14, 0x04}, 1},
 236         /* Acer Aspire 5739 */
 237         {"Acer", "Aspire 5739G", "V1.3311", 0x55, 0x58, {0x20, 0x00}, 0},
 238         /* Acer TravelMate 7730 */
 239         {"Acer", "TravelMate 7730G", "v0.3509", 0x55, 0x58, {0xaf, 0x00}, 0},
 240         /* Acer TravelMate TM8573T */
 241         {"Acer", "TM8573T", "V1.13", 0x93, 0xa8, {0x14, 0x04}, 1},
 242         /* Gateway */
 243         {"Gateway", "AOA110", "v0.3103",  0x55, 0x58, {0x21, 0x00}, 0},
 244         {"Gateway", "AOA150", "v0.3103",  0x55, 0x58, {0x20, 0x00}, 0},
 245         {"Gateway", "LT31",   "v1.3103",  0x55, 0x58, {0x9e, 0x00}, 0},
 246         {"Gateway", "LT31",   "v1.3201",  0x55, 0x58, {0x9e, 0x00}, 0},
 247         {"Gateway", "LT31",   "v1.3302",  0x55, 0x58, {0x9e, 0x00}, 0},
 248         {"Gateway", "LT31",   "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0},
 249         {"Gateway", "LT31",   "v1.3307",  0x55, 0x58, {0x9e, 0x00}, 0},
 250         /* Packard Bell */
 251         {"Packard Bell", "DOA150",  "v0.3104",  0x55, 0x58, {0x21, 0x00}, 0},
 252         {"Packard Bell", "DOA150",  "v0.3105",  0x55, 0x58, {0x20, 0x00}, 0},
 253         {"Packard Bell", "AOA110",  "v0.3105",  0x55, 0x58, {0x21, 0x00}, 0},
 254         {"Packard Bell", "AOA150",  "v0.3105",  0x55, 0x58, {0x20, 0x00}, 0},
 255         {"Packard Bell", "ENBFT",   "V1.3118",  0x55, 0x58, {0x9e, 0x00}, 0},
 256         {"Packard Bell", "ENBFT",   "V1.3127",  0x55, 0x58, {0x9e, 0x00}, 0},
 257         {"Packard Bell", "DOTMU",   "v1.3303",  0x55, 0x58, {0x9e, 0x00}, 0},
 258         {"Packard Bell", "DOTMU",   "v0.3120",  0x55, 0x58, {0x9e, 0x00}, 0},
 259         {"Packard Bell", "DOTMU",   "v0.3108",  0x55, 0x58, {0x9e, 0x00}, 0},
 260         {"Packard Bell", "DOTMU",   "v0.3113",  0x55, 0x58, {0x9e, 0x00}, 0},
 261         {"Packard Bell", "DOTMU",   "v0.3115",  0x55, 0x58, {0x9e, 0x00}, 0},
 262         {"Packard Bell", "DOTMU",   "v0.3117",  0x55, 0x58, {0x9e, 0x00}, 0},
 263         {"Packard Bell", "DOTMU",   "v0.3119",  0x55, 0x58, {0x9e, 0x00}, 0},
 264         {"Packard Bell", "DOTMU",   "v1.3204",  0x55, 0x58, {0x9e, 0x00}, 0},
 265         {"Packard Bell", "DOTMA",   "v1.3201",  0x55, 0x58, {0x9e, 0x00}, 0},
 266         {"Packard Bell", "DOTMA",   "v1.3302",  0x55, 0x58, {0x9e, 0x00}, 0},
 267         {"Packard Bell", "DOTMA",   "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0},
 268         {"Packard Bell", "DOTVR46", "v1.3308",  0x55, 0x58, {0x9e, 0x00}, 0},
 269         /* pewpew-terminator */
 270         {"", "", "", 0, 0, {0, 0}, 0}
 271 };
 272
 273 /*
 274  * this struct is used to instruct thermal layer to use bang_bang instead of
 275  * default governor for acerhdf
 276  */
 277 static struct thermal_zone_params acerhdf_zone_params = {
 278         .governor_name = "bang_bang",
 279 };
 280
 281 static int acerhdf_get_temp(int *temp)
 282 {
 283         u8 read_temp;
 284
 285         if (ec_read(ctrl_cfg.tempreg, &read_temp))
 286                 return -EINVAL;
 287
 288         *temp = read_temp * 1000;
 289
 290         return 0;
 291 }
 292
 293 static int acerhdf_get_fanstate(int *state)
 294 {
 295         u8 fan;
 296
 297         if (ec_read(ctrl_cfg.fanreg, &fan))
 298                 return -EINVAL;
 299
 300         if (fan != ctrl_cfg.cmd.cmd_off)
 301                 *state = ACERHDF_FAN_AUTO;
 302         else
 303                 *state = ACERHDF_FAN_OFF;
 304
 305         return 0;
 306 }
 307
 308 static void acerhdf_change_fanstate(int state)
 309 {
 310         unsigned char cmd;
 311
 312         if (verbose)
 313                 pr_notice("fan %s\n", state == ACERHDF_FAN_OFF ? "OFF" : "ON");
 314
 315         if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
 316                 pr_err("invalid fan state %d requested, setting to auto!\n",
 317                        state);
 318                 state = ACERHDF_FAN_AUTO;
 319         }
 320
 321         cmd = (state == ACERHDF_FAN_OFF) ? ctrl_cfg.cmd.cmd_off
 322                                          : ctrl_cfg.cmd.cmd_auto;
 323         fanstate = state;
 324
 325         ec_write(ctrl_cfg.fanreg, cmd);
 326
 327         if (ctrl_cfg.mcmd_enable && state == ACERHDF_FAN_OFF) {
 328                 if (verbose)
 329                         pr_notice("turning off fan manually\n");
 330                 ec_write(mcmd.mreg, mcmd.moff);
 331         }
 332 }
 333
 334 static void acerhdf_check_param(struct thermal_zone_device *thermal)
 335 {
 336         if (fanon > ACERHDF_MAX_FANON) {
 337                 pr_err("fanon temperature too high, set to %d\n",
 338                        ACERHDF_MAX_FANON);
 339                 fanon = ACERHDF_MAX_FANON;
 340         }
 341
 342         if (kernelmode && prev_interval != interval) {
 343                 if (interval > ACERHDF_MAX_INTERVAL) {
 344                         pr_err("interval too high, set to %d\n",
 345                                ACERHDF_MAX_INTERVAL);
 346                         interval = ACERHDF_MAX_INTERVAL;
 347                 }
 348                 if (verbose)
 349                         pr_notice("interval changed to: %d\n", interval);
 350                 thermal->polling_delay = interval*1000;
 351                 prev_interval = interval;
 352         }
 353 }
 354
 355 /*
 356  * This is the thermal zone callback which does the delayed polling of the fan
 357  * state. We do check /sysfs-originating settings here in acerhdf_check_param()
 358  * as late as the polling interval is since we can't do that in the respective
 359  * accessors of the module parameters.
 360  */
 361 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, int *t)
 362 {
 363         int temp, err = 0;
 364
 365         acerhdf_check_param(thermal);
 366
 367         err = acerhdf_get_temp(&temp);
 368         if (err)
 369                 return err;
 370
 371         if (verbose)
 372                 pr_notice("temp %d\n", temp);
 373
 374         *t = temp;
 375         return 0;
 376 }
 377
 378 static int acerhdf_bind(struct thermal_zone_device *thermal,
 379                         struct thermal_cooling_device *cdev)
 380 {
 381         /* if the cooling device is the one from acerhdf bind it */
 382         if (cdev != cl_dev)
 383                 return 0;
 384
 385         if (thermal_zone_bind_cooling_device(thermal, 0, cdev,
 386                         THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
 387                         THERMAL_WEIGHT_DEFAULT)) {
 388                 pr_err("error binding cooling dev\n");
 389                 return -EINVAL;
 390         }
 391         return 0;
 392 }
 393
 394 static int acerhdf_unbind(struct thermal_zone_device *thermal,
 395                           struct thermal_cooling_device *cdev)
 396 {
 397         if (cdev != cl_dev)
 398                 return 0;
 399
 400         if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
 401                 pr_err("error unbinding cooling dev\n");
 402                 return -EINVAL;
 403         }
 404         return 0;
 405 }
 406
 407 static inline void acerhdf_revert_to_bios_mode(void)
 408 {
 409         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 410         kernelmode = 0;
 411         if (thz_dev)
 412                 thz_dev->polling_delay = 0;
 413         pr_notice("kernel mode fan control OFF\n");
 414 }
 415 static inline void acerhdf_enable_kernelmode(void)
 416 {
 417         kernelmode = 1;
 418
 419         thz_dev->polling_delay = interval*1000;
 420         thermal_zone_device_update(thz_dev, THERMAL_EVENT_UNSPECIFIED);
 421         pr_notice("kernel mode fan control ON\n");
 422 }
 423
 424 static int acerhdf_get_mode(struct thermal_zone_device *thermal,
 425                             enum thermal_device_mode *mode)
 426 {
 427         if (verbose)
 428                 pr_notice("kernel mode fan control %d\n", kernelmode);
 429
 430         *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED
 431                              : THERMAL_DEVICE_DISABLED;
 432
 433         return 0;
 434 }
 435
 436 /*
 437  * set operation mode;
 438  * enabled: the thermal layer of the kernel takes care about
 439  *          the temperature and the fan.
 440  * disabled: the BIOS takes control of the fan.
 441  */
 442 static int acerhdf_set_mode(struct thermal_zone_device *thermal,
 443                             enum thermal_device_mode mode)
 444 {
 445         if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
 446                 acerhdf_revert_to_bios_mode();
 447         else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
 448                 acerhdf_enable_kernelmode();
 449
 450         return 0;
 451 }
 452
 453 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
 454                                  enum thermal_trip_type *type)
 455 {
 456         if (trip == 0)
 457                 *type = THERMAL_TRIP_ACTIVE;
 458         else if (trip == 1)
 459                 *type = THERMAL_TRIP_CRITICAL;
 460         else
 461                 return -EINVAL;
 462
 463         return 0;
 464 }
 465
 466 static int acerhdf_get_trip_hyst(struct thermal_zone_device *thermal, int trip,
 467                                  int *temp)
 468 {
 469         if (trip != 0)
 470                 return -EINVAL;
 471
 472         *temp = fanon - fanoff;
 473
 474         return 0;
 475 }
 476
 477 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
 478                                  int *temp)
 479 {
 480         if (trip == 0)
 481                 *temp = fanon;
 482         else if (trip == 1)
 483                 *temp = ACERHDF_TEMP_CRIT;
 484         else
 485                 return -EINVAL;
 486
 487         return 0;
 488 }
 489
 490 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
 491                                  int *temperature)
 492 {
 493         *temperature = ACERHDF_TEMP_CRIT;
 494         return 0;
 495 }
 496
 497 /* bind callback functions to thermalzone */
 498 static struct thermal_zone_device_ops acerhdf_dev_ops = {
 499         .bind = acerhdf_bind,
 500         .unbind = acerhdf_unbind,
 501         .get_temp = acerhdf_get_ec_temp,
 502         .get_mode = acerhdf_get_mode,
 503         .set_mode = acerhdf_set_mode,
 504         .get_trip_type = acerhdf_get_trip_type,
 505         .get_trip_hyst = acerhdf_get_trip_hyst,
 506         .get_trip_temp = acerhdf_get_trip_temp,
 507         .get_crit_temp = acerhdf_get_crit_temp,
 508 };
 509
 510
 511 /*
 512  * cooling device callback functions
 513  * get maximal fan cooling state
 514  */
 515 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
 516                                  unsigned long *state)
 517 {
 518         *state = 1;
 519
 520         return 0;
 521 }
 522
 523 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
 524                                  unsigned long *state)
 525 {
 526         int err = 0, tmp;
 527
 528         err = acerhdf_get_fanstate(&tmp);
 529         if (err)
 530                 return err;
 531
 532         *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
 533         return 0;
 534 }
 535
 536 /* change current fan state - is overwritten when running in kernel mode */
 537 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
 538                                  unsigned long state)
 539 {
 540         int cur_temp, cur_state, err = 0;
 541
 542         if (!kernelmode)
 543                 return 0;
 544
 545         err = acerhdf_get_temp(&cur_temp);
 546         if (err) {
 547                 pr_err("error reading temperature, hand off control to BIOS\n");
 548                 goto err_out;
 549         }
 550
 551         err = acerhdf_get_fanstate(&cur_state);
 552         if (err) {
 553                 pr_err("error reading fan state, hand off control to BIOS\n");
 554                 goto err_out;
 555         }
 556
 557         if (state == 0) {
 558                 if (cur_state == ACERHDF_FAN_AUTO)
 559                         acerhdf_change_fanstate(ACERHDF_FAN_OFF);
 560         } else {
 561                 if (cur_state == ACERHDF_FAN_OFF)
 562                         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 563         }
 564         return 0;
 565
 566 err_out:
 567         acerhdf_revert_to_bios_mode();
 568         return -EINVAL;
 569 }
 570
 571 /* bind fan callbacks to fan device */
 572 static const struct thermal_cooling_device_ops acerhdf_cooling_ops = {
 573         .get_max_state = acerhdf_get_max_state,
 574         .get_cur_state = acerhdf_get_cur_state,
 575         .set_cur_state = acerhdf_set_cur_state,
 576 };
 577
 578 /* suspend / resume functionality */
 579 static int acerhdf_suspend(struct device *dev)
 580 {
 581         if (kernelmode)
 582                 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 583
 584         if (verbose)
 585                 pr_notice("going suspend\n");
 586
 587         return 0;
 588 }
 589
 590 static int acerhdf_probe(struct platform_device *device)
 591 {
 592         return 0;
 593 }
 594
 595 static int acerhdf_remove(struct platform_device *device)
 596 {
 597         return 0;
 598 }
 599
 600 static const struct dev_pm_ops acerhdf_pm_ops = {
 601         .suspend = acerhdf_suspend,
 602         .freeze  = acerhdf_suspend,
 603 };
 604
 605 static struct platform_driver acerhdf_driver = {
 606         .driver = {
 607                 .name  = "acerhdf",
 608                 .pm    = &acerhdf_pm_ops,
 609         },
 610         .probe = acerhdf_probe,
 611         .remove = acerhdf_remove,
 612 };
 613
 614 /* checks if str begins with start */
 615 static int str_starts_with(const char *str, const char *start)
 616 {
 617         unsigned long str_len = 0, start_len = 0;
 618
 619         str_len = strlen(str);
 620         start_len = strlen(start);
 621
 622         if (str_len >= start_len &&
 623                         !strncmp(str, start, start_len))
 624                 return 1;
 625
 626         return 0;
 627 }
 628
 629 /* check hardware */
 630 static int __init acerhdf_check_hardware(void)
 631 {
 632         char const *vendor, *version, *product;
 633         const struct bios_settings *bt = NULL;
 634         int found = 0;
 635
 636         /* get BIOS data */
 637         vendor  = dmi_get_system_info(DMI_SYS_VENDOR);
 638         version = dmi_get_system_info(DMI_BIOS_VERSION);
 639         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 640
 641         if (!vendor || !version || !product) {
 642                 pr_err("error getting hardware information\n");
 643                 return -EINVAL;
 644         }
 645
 646         pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
 647
 648         if (list_supported) {
 649                 pr_info("List of supported Manufacturer/Model/BIOS:\n");
 650                 pr_info("---------------------------------------------------\n");
 651                 for (bt = bios_tbl; bt->vendor[0]; bt++) {
 652                         pr_info("%-13s | %-17s | %-10s\n", bt->vendor,
 653                                 bt->product, bt->version);
 654                 }
 655                 pr_info("---------------------------------------------------\n");
 656                 return -ECANCELED;
 657         }
 658
 659         if (force_bios[0]) {
 660                 version = force_bios;
 661                 pr_info("forcing BIOS version: %s\n", version);
 662                 kernelmode = 0;
 663         }
 664
 665         if (force_product[0]) {
 666                 product = force_product;
 667                 pr_info("forcing BIOS product: %s\n", product);
 668                 kernelmode = 0;
 669         }
 670
 671         if (verbose)
 672                 pr_info("BIOS info: %s %s, product: %s\n",
 673                         vendor, version, product);
 674
 675         /* search BIOS version and vendor in BIOS settings table */
 676         for (bt = bios_tbl; bt->vendor[0]; bt++) {
 677                 /*
 678                  * check if actual hardware BIOS vendor, product and version
 679                  * IDs start with the strings of BIOS table entry
 680                  */
 681                 if (str_starts_with(vendor, bt->vendor) &&
 682                                 str_starts_with(product, bt->product) &&
 683                                 str_starts_with(version, bt->version)) {
 684                         found = 1;
 685                         break;
 686                 }
 687         }
 688
 689         if (!found) {
 690                 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n",
 691                        vendor, product, version);
 692                 return -EINVAL;
 693         }
 694
 695         /* Copy control settings from BIOS table before we free it. */
 696         ctrl_cfg.fanreg = bt->fanreg;
 697         ctrl_cfg.tempreg = bt->tempreg;
 698         memcpy(&ctrl_cfg.cmd, &bt->cmd, sizeof(struct fancmd));
 699         ctrl_cfg.mcmd_enable = bt->mcmd_enable;
 700
 701         /*
 702          * if started with kernel mode off, prevent the kernel from switching
 703          * off the fan
 704          */
 705         if (!kernelmode) {
 706                 pr_notice("Fan control off, to enable do:\n");
 707                 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zoneN/mode # N=0,1,2...\n");
 708         }
 709
 710         return 0;
 711 }
 712
 713 static int __init acerhdf_register_platform(void)
 714 {
 715         int err = 0;
 716
 717         err = platform_driver_register(&acerhdf_driver);
 718         if (err)
 719                 return err;
 720
 721         acerhdf_dev = platform_device_alloc("acerhdf", -1);
 722         if (!acerhdf_dev) {
 723                 err = -ENOMEM;
 724                 goto err_device_alloc;
 725         }
 726         err = platform_device_add(acerhdf_dev);
 727         if (err)
 728                 goto err_device_add;
 729
 730         return 0;
 731
 732 err_device_add:
 733         platform_device_put(acerhdf_dev);
 734 err_device_alloc:
 735         platform_driver_unregister(&acerhdf_driver);
 736         return err;
 737 }
 738
 739 static void acerhdf_unregister_platform(void)
 740 {
 741         platform_device_unregister(acerhdf_dev);
 742         platform_driver_unregister(&acerhdf_driver);
 743 }
 744
 745 static int __init acerhdf_register_thermal(void)
 746 {
 747         cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
 748                                                  &acerhdf_cooling_ops);
 749
 750         if (IS_ERR(cl_dev))
 751                 return -EINVAL;
 752
 753         thz_dev = thermal_zone_device_register("acerhdf", 2, 0, NULL,
 754                                               &acerhdf_dev_ops,
 755                                               &acerhdf_zone_params, 0,
 756                                               (kernelmode) ? interval*1000 : 0);
 757         if (IS_ERR(thz_dev))
 758                 return -EINVAL;
 759
 760         if (strcmp(thz_dev->governor->name,
 761                                 acerhdf_zone_params.governor_name)) {
 762                 pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n",
 763                                 acerhdf_zone_params.governor_name);
 764                 return -EINVAL;
 765         }
 766
 767         return 0;
 768 }
 769
 770 static void acerhdf_unregister_thermal(void)
 771 {
 772         if (cl_dev) {
 773                 thermal_cooling_device_unregister(cl_dev);
 774                 cl_dev = NULL;
 775         }
 776
 777         if (thz_dev) {
 778                 thermal_zone_device_unregister(thz_dev);
 779                 thz_dev = NULL;
 780         }
 781 }
 782
 783 static int __init acerhdf_init(void)
 784 {
 785         int err = 0;
 786
 787         err = acerhdf_check_hardware();
 788         if (err)
 789                 goto out_err;
 790
 791         err = acerhdf_register_platform();
 792         if (err)
 793                 goto out_err;
 794
 795         err = acerhdf_register_thermal();
 796         if (err)
 797                 goto err_unreg;
 798
 799         return 0;
 800
 801 err_unreg:
 802         acerhdf_unregister_thermal();
 803         acerhdf_unregister_platform();
 804
 805 out_err:
 806         return err;
 807 }
 808
 809 static void __exit acerhdf_exit(void)
 810 {
 811         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 812         acerhdf_unregister_thermal();
 813         acerhdf_unregister_platform();
 814 }
 815
 816 MODULE_LICENSE("GPL");
 817 MODULE_AUTHOR("Peter Feuerer");
 818 MODULE_DESCRIPTION("Aspire One temperature and fan driver");
 819 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
 820 MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:");
 821 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:");
 822 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:");
 823 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5755G:");
 824 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:");
 825 MODULE_ALIAS("dmi:*:*Acer*:pnAO521*:");
 826 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
 827 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5739G:");
 828 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*One*753:");
 829 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5315:");
 830 MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:");
 831 MODULE_ALIAS("dmi:*:*Acer*:TM8573T:");
 832 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
 833 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
 834 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:");
 835 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:");
 836 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:");
 837 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:");
 838 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:");
 839 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:");
 840 MODULE_ALIAS("dmi:*:*Acer*:pnExtensa 5420*:");
 841
 842 module_init(acerhdf_init);
 843 module_exit(acerhdf_exit);