drivers/platform/x86/acerhdf.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * acerhdf - A driver which monitors the temperature
   4  *           of the aspire one netbook, turns on/off the fan
   5  *           as soon as the upper/lower threshold is reached.
   6  *
   7  * (C) 2009 - Peter Kaestle     peter (a) piie.net
   8  *                              https://piie.net
   9  *     2009 Borislav Petkov     bp (a) alien8.de
  10  *
  11  * Inspired by and many thanks to:
  12  *  o acerfand   - Rachel Greenham
  13  *  o acer_ec.pl - Michael Kurz     michi.kurz (at) googlemail.com
  14  *               - Petr Tomasek     tomasek (#) etf,cuni,cz
  15  *               - Carlos Corbacho  cathectic (at) gmail.com
  16  *  o lkml       - Matthew Garrett
  17  *               - Borislav Petkov
  18  *               - Andreas Mohr
  19  */
  20
  21 #define pr_fmt(fmt) "acerhdf: " fmt
  22
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/dmi.h>
  26 #include <linux/acpi.h>
  27 #include <linux/thermal.h>
  28 #include <linux/platform_device.h>
  29
  30 /*
  31  * The driver is started with "kernel mode off" by default. That means, the BIOS
  32  * is still in control of the fan. In this mode the driver allows to read the
  33  * temperature of the cpu and a userspace tool may take over control of the fan.
  34  * If the driver is switched to "kernel mode" (e.g. via module parameter) the
  35  * driver is in full control of the fan. If you want the module to be started in
  36  * kernel mode by default, define the following:
  37  */
  38 #undef START_IN_KERNEL_MODE
  39
  40 #define DRV_VER "0.7.0"
  41
  42 /*
  43  * According to the Atom N270 datasheet,
  44  * (http://download.intel.com/design/processor/datashts/320032.pdf) the
  45  * CPU's optimal operating limits denoted in junction temperature as
  46  * measured by the on-die thermal monitor are within 0 <= Tj <= 90. So,
  47  * assume 89°C is critical temperature.
  48  */
  49 #define ACERHDF_TEMP_CRIT 89000
  50 #define ACERHDF_FAN_OFF 0
  51 #define ACERHDF_FAN_AUTO 1
  52
  53 /*
  54  * No matter what value the user puts into the fanon variable, turn on the fan
  55  * at 80 degree Celsius to prevent hardware damage
  56  */
  57 #define ACERHDF_MAX_FANON 80000
  58
  59 /*
  60  * Maximum interval between two temperature checks is 15 seconds, as the die
  61  * can get hot really fast under heavy load (plus we shouldn't forget about
  62  * possible impact of _external_ aggressive sources such as heaters, sun etc.)
  63  */
  64 #define ACERHDF_MAX_INTERVAL 15
  65
  66 #ifdef START_IN_KERNEL_MODE
  67 static int kernelmode = 1;
  68 #else
  69 static int kernelmode;
  70 #endif
  71
  72 static unsigned int interval = 10;
  73 static unsigned int fanon = 60000;
  74 static unsigned int fanoff = 53000;
  75 static unsigned int verbose;
  76 static unsigned int list_supported;
  77 static unsigned int fanstate = ACERHDF_FAN_AUTO;
  78 static char force_bios[16];
  79 static char force_product[16];
  80 static unsigned int prev_interval;
  81 static struct thermal_zone_device *thz_dev;
  82 static struct thermal_cooling_device *cl_dev;
  83 static struct platform_device *acerhdf_dev;
  84
  85 module_param(kernelmode, uint, 0);
  86 MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off");
  87 module_param(fanon, uint, 0600);
  88 MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature");
  89 module_param(fanoff, uint, 0600);
  90 MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature");
  91 module_param(verbose, uint, 0600);
  92 MODULE_PARM_DESC(verbose, "Enable verbose dmesg output");
  93 module_param(list_supported, uint, 0600);
  94 MODULE_PARM_DESC(list_supported, "List supported models and BIOS versions");
  95 module_param_string(force_bios, force_bios, 16, 0);
  96 MODULE_PARM_DESC(force_bios, "Pretend system has this known supported BIOS version");
  97 module_param_string(force_product, force_product, 16, 0);
  98 MODULE_PARM_DESC(force_product, "Pretend system is this known supported model");
  99
 100 /*
 101  * cmd_off: to switch the fan completely off and check if the fan is off
 102  *      cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then
 103  *              the fan speed depending on the temperature
 104  */
 105 struct fancmd {
 106         u8 cmd_off;
 107         u8 cmd_auto;
 108 };
 109
 110 struct manualcmd {
 111         u8 mreg;
 112         u8 moff;
 113 };
 114
 115 /* default register and command to disable fan in manual mode */
 116 static const struct manualcmd mcmd = {
 117         .mreg = 0x94,
 118         .moff = 0xff,
 119 };
 120
 121 /* BIOS settings - only used during probe */
 122 struct bios_settings {
 123         const char *vendor;
 124         const char *product;
 125         const char *version;
 126         u8 fanreg;
 127         u8 tempreg;
 128         struct fancmd cmd;
 129         int mcmd_enable;
 130 };
 131
 132 /* This could be a daughter struct in the above, but not worth the redirect */
 133 struct ctrl_settings {
 134         u8 fanreg;
 135         u8 tempreg;
 136         struct fancmd cmd;
 137         int mcmd_enable;
 138 };
 139
 140 static struct ctrl_settings ctrl_cfg __read_mostly;
 141
 142 /* Register addresses and values for different BIOS versions */
 143 static const struct bios_settings bios_tbl[] __initconst = {
 144         /* AOA110 */
 145         {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00}, 0},
 146         {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0},
 147         {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00}, 0},
 148         {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00}, 0},
 149         {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00}, 0},
 150         {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00}, 0},
 151         {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00}, 0},
 152         {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00}, 0},
 153         {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00}, 0},
 154         /* AOA150 */
 155         {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0},
 156         {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00}, 0},
 157         {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0},
 158         {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00}, 0},
 159         {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00}, 0},
 160         {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00}, 0},
 161         {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00}, 0},
 162         {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0},
 163         /* LT1005u */
 164         {"Acer", "LT-10Q", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0},
 165         /* Acer 1410 */
 166         {"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
 167         {"Acer", "Aspire 1410", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
 168         {"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
 169         {"Acer", "Aspire 1410", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
 170         {"Acer", "Aspire 1410", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
 171         {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
 172         {"Acer", "Aspire 1410", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
 173         {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
 174         {"Acer", "Aspire 1410", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
 175         {"Acer", "Aspire 1410", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
 176         {"Acer", "Aspire 1410", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
 177         /* Acer 1810xx */
 178         {"Acer", "Aspire 1810TZ", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
 179         {"Acer", "Aspire 1810T",  "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
 180         {"Acer", "Aspire 1810TZ", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
 181         {"Acer", "Aspire 1810T",  "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
 182         {"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
 183         {"Acer", "Aspire 1810T",  "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
 184         {"Acer", "Aspire 1810TZ", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
 185         {"Acer", "Aspire 1810T",  "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
 186         {"Acer", "Aspire 1810TZ", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
 187         {"Acer", "Aspire 1810T",  "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
 188         {"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
 189         {"Acer", "Aspire 1810T",  "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
 190         {"Acer", "Aspire 1810TZ", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
 191         {"Acer", "Aspire 1810T",  "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
 192         {"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
 193         {"Acer", "Aspire 1810T",  "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
 194         {"Acer", "Aspire 1810TZ", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
 195         {"Acer", "Aspire 1810T",  "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
 196         {"Acer", "Aspire 1810TZ", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
 197         {"Acer", "Aspire 1810T",  "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
 198         {"Acer", "Aspire 1810TZ", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
 199         {"Acer", "Aspire 1810T",  "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
 200         /* Acer 5755G */
 201         {"Acer", "Aspire 5755G",  "V1.20",   0xab, 0xb4, {0x00, 0x08}, 0},
 202         {"Acer", "Aspire 5755G",  "V1.21",   0xab, 0xb3, {0x00, 0x08}, 0},
 203         /* Acer 521 */
 204         {"Acer", "AO521", "V1.11", 0x55, 0x58, {0x1f, 0x00}, 0},
 205         /* Acer 531 */
 206         {"Acer", "AO531h", "v0.3104", 0x55, 0x58, {0x20, 0x00}, 0},
 207         {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00}, 0},
 208         {"Acer", "AO531h", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0},
 209         /* Acer 751 */
 210         {"Acer", "AO751h", "V0.3206", 0x55, 0x58, {0x21, 0x00}, 0},
 211         {"Acer", "AO751h", "V0.3212", 0x55, 0x58, {0x21, 0x00}, 0},
 212         /* Acer 753 */
 213         {"Acer", "Aspire One 753", "V1.24", 0x93, 0xac, {0x14, 0x04}, 1},
 214         /* Acer 1825 */
 215         {"Acer", "Aspire 1825PTZ", "V1.3118", 0x55, 0x58, {0x9e, 0x00}, 0},
 216         {"Acer", "Aspire 1825PTZ", "V1.3127", 0x55, 0x58, {0x9e, 0x00}, 0},
 217         /* Acer Extensa 5420 */
 218         {"Acer", "Extensa 5420", "V1.17", 0x93, 0xac, {0x14, 0x04}, 1},
 219         /* Acer Aspire 5315 */
 220         {"Acer", "Aspire 5315", "V1.19", 0x93, 0xac, {0x14, 0x04}, 1},
 221         /* Acer Aspire 5739 */
 222         {"Acer", "Aspire 5739G", "V1.3311", 0x55, 0x58, {0x20, 0x00}, 0},
 223         /* Acer TravelMate 7730 */
 224         {"Acer", "TravelMate 7730G", "v0.3509", 0x55, 0x58, {0xaf, 0x00}, 0},
 225         /* Acer Aspire 7551 */
 226         {"Acer", "Aspire 7551", "V1.18", 0x93, 0xa8, {0x14, 0x04}, 1},
 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         {"Gateway", "LT31",   "v1.3307",  0x55, 0x58, {0x9e, 0x00}, 0},
 237         /* Packard Bell */
 238         {"Packard Bell", "DOA150",  "v0.3104",  0x55, 0x58, {0x21, 0x00}, 0},
 239         {"Packard Bell", "DOA150",  "v0.3105",  0x55, 0x58, {0x20, 0x00}, 0},
 240         {"Packard Bell", "AOA110",  "v0.3105",  0x55, 0x58, {0x21, 0x00}, 0},
 241         {"Packard Bell", "AOA150",  "v0.3105",  0x55, 0x58, {0x20, 0x00}, 0},
 242         {"Packard Bell", "ENBFT",   "V1.3118",  0x55, 0x58, {0x9e, 0x00}, 0},
 243         {"Packard Bell", "ENBFT",   "V1.3127",  0x55, 0x58, {0x9e, 0x00}, 0},
 244         {"Packard Bell", "DOTMU",   "v1.3303",  0x55, 0x58, {0x9e, 0x00}, 0},
 245         {"Packard Bell", "DOTMU",   "v0.3120",  0x55, 0x58, {0x9e, 0x00}, 0},
 246         {"Packard Bell", "DOTMU",   "v0.3108",  0x55, 0x58, {0x9e, 0x00}, 0},
 247         {"Packard Bell", "DOTMU",   "v0.3113",  0x55, 0x58, {0x9e, 0x00}, 0},
 248         {"Packard Bell", "DOTMU",   "v0.3115",  0x55, 0x58, {0x9e, 0x00}, 0},
 249         {"Packard Bell", "DOTMU",   "v0.3117",  0x55, 0x58, {0x9e, 0x00}, 0},
 250         {"Packard Bell", "DOTMU",   "v0.3119",  0x55, 0x58, {0x9e, 0x00}, 0},
 251         {"Packard Bell", "DOTMU",   "v1.3204",  0x55, 0x58, {0x9e, 0x00}, 0},
 252         {"Packard Bell", "DOTMA",   "v1.3201",  0x55, 0x58, {0x9e, 0x00}, 0},
 253         {"Packard Bell", "DOTMA",   "v1.3302",  0x55, 0x58, {0x9e, 0x00}, 0},
 254         {"Packard Bell", "DOTMA",   "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0},
 255         {"Packard Bell", "DOTVR46", "v1.3308",  0x55, 0x58, {0x9e, 0x00}, 0},
 256         /* pewpew-terminator */
 257         {"", "", "", 0, 0, {0, 0}, 0}
 258 };
 259
 260 /*
 261  * this struct is used to instruct thermal layer to use bang_bang instead of
 262  * default governor for acerhdf
 263  */
 264 static struct thermal_zone_params acerhdf_zone_params = {
 265         .governor_name = "bang_bang",
 266 };
 267
 268 static int acerhdf_get_temp(int *temp)
 269 {
 270         u8 read_temp;
 271
 272         if (ec_read(ctrl_cfg.tempreg, &read_temp))
 273                 return -EINVAL;
 274
 275         *temp = read_temp * 1000;
 276
 277         return 0;
 278 }
 279
 280 static int acerhdf_get_fanstate(int *state)
 281 {
 282         u8 fan;
 283
 284         if (ec_read(ctrl_cfg.fanreg, &fan))
 285                 return -EINVAL;
 286
 287         if (fan != ctrl_cfg.cmd.cmd_off)
 288                 *state = ACERHDF_FAN_AUTO;
 289         else
 290                 *state = ACERHDF_FAN_OFF;
 291
 292         return 0;
 293 }
 294
 295 static void acerhdf_change_fanstate(int state)
 296 {
 297         unsigned char cmd;
 298
 299         if (verbose)
 300                 pr_notice("fan %s\n", state == ACERHDF_FAN_OFF ? "OFF" : "ON");
 301
 302         if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
 303                 pr_err("invalid fan state %d requested, setting to auto!\n",
 304                        state);
 305                 state = ACERHDF_FAN_AUTO;
 306         }
 307
 308         cmd = (state == ACERHDF_FAN_OFF) ? ctrl_cfg.cmd.cmd_off
 309                                          : ctrl_cfg.cmd.cmd_auto;
 310         fanstate = state;
 311
 312         ec_write(ctrl_cfg.fanreg, cmd);
 313
 314         if (ctrl_cfg.mcmd_enable && state == ACERHDF_FAN_OFF) {
 315                 if (verbose)
 316                         pr_notice("turning off fan manually\n");
 317                 ec_write(mcmd.mreg, mcmd.moff);
 318         }
 319 }
 320
 321 static void acerhdf_check_param(struct thermal_zone_device *thermal)
 322 {
 323         if (fanon > ACERHDF_MAX_FANON) {
 324                 pr_err("fanon temperature too high, set to %d\n",
 325                        ACERHDF_MAX_FANON);
 326                 fanon = ACERHDF_MAX_FANON;
 327         }
 328
 329         if (kernelmode && prev_interval != interval) {
 330                 if (interval > ACERHDF_MAX_INTERVAL) {
 331                         pr_err("interval too high, set to %d\n",
 332                                ACERHDF_MAX_INTERVAL);
 333                         interval = ACERHDF_MAX_INTERVAL;
 334                 }
 335                 if (verbose)
 336                         pr_notice("interval changed to: %d\n", interval);
 337
 338                 if (thermal)
 339                         thermal->polling_delay = interval*1000;
 340
 341                 prev_interval = interval;
 342         }
 343 }
 344
 345 /*
 346  * This is the thermal zone callback which does the delayed polling of the fan
 347  * state. We do check /sysfs-originating settings here in acerhdf_check_param()
 348  * as late as the polling interval is since we can't do that in the respective
 349  * accessors of the module parameters.
 350  */
 351 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, int *t)
 352 {
 353         int temp, err = 0;
 354
 355         err = acerhdf_get_temp(&temp);
 356         if (err)
 357                 return err;
 358
 359         if (verbose)
 360                 pr_notice("temp %d\n", temp);
 361
 362         *t = temp;
 363         return 0;
 364 }
 365
 366 static int acerhdf_bind(struct thermal_zone_device *thermal,
 367                         struct thermal_cooling_device *cdev)
 368 {
 369         /* if the cooling device is the one from acerhdf bind it */
 370         if (cdev != cl_dev)
 371                 return 0;
 372
 373         if (thermal_zone_bind_cooling_device(thermal, 0, cdev,
 374                         THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
 375                         THERMAL_WEIGHT_DEFAULT)) {
 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
 400         pr_notice("kernel mode fan control OFF\n");
 401 }
 402 static inline void acerhdf_enable_kernelmode(void)
 403 {
 404         kernelmode = 1;
 405
 406         pr_notice("kernel mode fan control ON\n");
 407 }
 408
 409 /*
 410  * set operation mode;
 411  * enabled: the thermal layer of the kernel takes care about
 412  *          the temperature and the fan.
 413  * disabled: the BIOS takes control of the fan.
 414  */
 415 static int acerhdf_change_mode(struct thermal_zone_device *thermal,
 416                                enum thermal_device_mode mode)
 417 {
 418         if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
 419                 acerhdf_revert_to_bios_mode();
 420         else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
 421                 acerhdf_enable_kernelmode();
 422
 423         return 0;
 424 }
 425
 426 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
 427                                  enum thermal_trip_type *type)
 428 {
 429         if (trip == 0)
 430                 *type = THERMAL_TRIP_ACTIVE;
 431         else if (trip == 1)
 432                 *type = THERMAL_TRIP_CRITICAL;
 433         else
 434                 return -EINVAL;
 435
 436         return 0;
 437 }
 438
 439 static int acerhdf_get_trip_hyst(struct thermal_zone_device *thermal, int trip,
 440                                  int *temp)
 441 {
 442         if (trip != 0)
 443                 return -EINVAL;
 444
 445         *temp = fanon - fanoff;
 446
 447         return 0;
 448 }
 449
 450 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
 451                                  int *temp)
 452 {
 453         if (trip == 0)
 454                 *temp = fanon;
 455         else if (trip == 1)
 456                 *temp = ACERHDF_TEMP_CRIT;
 457         else
 458                 return -EINVAL;
 459
 460         return 0;
 461 }
 462
 463 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
 464                                  int *temperature)
 465 {
 466         *temperature = ACERHDF_TEMP_CRIT;
 467         return 0;
 468 }
 469
 470 /* bind callback functions to thermalzone */
 471 static struct thermal_zone_device_ops acerhdf_dev_ops = {
 472         .bind = acerhdf_bind,
 473         .unbind = acerhdf_unbind,
 474         .get_temp = acerhdf_get_ec_temp,
 475         .change_mode = acerhdf_change_mode,
 476         .get_trip_type = acerhdf_get_trip_type,
 477         .get_trip_hyst = acerhdf_get_trip_hyst,
 478         .get_trip_temp = acerhdf_get_trip_temp,
 479         .get_crit_temp = acerhdf_get_crit_temp,
 480 };
 481
 482
 483 /*
 484  * cooling device callback functions
 485  * get maximal fan cooling state
 486  */
 487 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
 488                                  unsigned long *state)
 489 {
 490         *state = 1;
 491
 492         return 0;
 493 }
 494
 495 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
 496                                  unsigned long *state)
 497 {
 498         int err = 0, tmp;
 499
 500         err = acerhdf_get_fanstate(&tmp);
 501         if (err)
 502                 return err;
 503
 504         *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
 505         return 0;
 506 }
 507
 508 /* change current fan state - is overwritten when running in kernel mode */
 509 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
 510                                  unsigned long state)
 511 {
 512         int cur_temp, cur_state, err = 0;
 513
 514         if (!kernelmode)
 515                 return 0;
 516
 517         err = acerhdf_get_temp(&cur_temp);
 518         if (err) {
 519                 pr_err("error reading temperature, hand off control to BIOS\n");
 520                 goto err_out;
 521         }
 522
 523         err = acerhdf_get_fanstate(&cur_state);
 524         if (err) {
 525                 pr_err("error reading fan state, hand off control to BIOS\n");
 526                 goto err_out;
 527         }
 528
 529         if (state == 0) {
 530                 if (cur_state == ACERHDF_FAN_AUTO)
 531                         acerhdf_change_fanstate(ACERHDF_FAN_OFF);
 532         } else {
 533                 if (cur_state == ACERHDF_FAN_OFF)
 534                         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 535         }
 536         return 0;
 537
 538 err_out:
 539         acerhdf_revert_to_bios_mode();
 540         return -EINVAL;
 541 }
 542
 543 /* bind fan callbacks to fan device */
 544 static const struct thermal_cooling_device_ops acerhdf_cooling_ops = {
 545         .get_max_state = acerhdf_get_max_state,
 546         .get_cur_state = acerhdf_get_cur_state,
 547         .set_cur_state = acerhdf_set_cur_state,
 548 };
 549
 550 /* suspend / resume functionality */
 551 static int acerhdf_suspend(struct device *dev)
 552 {
 553         if (kernelmode)
 554                 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 555
 556         if (verbose)
 557                 pr_notice("going suspend\n");
 558
 559         return 0;
 560 }
 561
 562 static int acerhdf_probe(struct platform_device *device)
 563 {
 564         return 0;
 565 }
 566
 567 static int acerhdf_remove(struct platform_device *device)
 568 {
 569         return 0;
 570 }
 571
 572 static const struct dev_pm_ops acerhdf_pm_ops = {
 573         .suspend = acerhdf_suspend,
 574         .freeze  = acerhdf_suspend,
 575 };
 576
 577 static struct platform_driver acerhdf_driver = {
 578         .driver = {
 579                 .name  = "acerhdf",
 580                 .pm    = &acerhdf_pm_ops,
 581         },
 582         .probe = acerhdf_probe,
 583         .remove = acerhdf_remove,
 584 };
 585
 586 /* checks if str begins with start */
 587 static int str_starts_with(const char *str, const char *start)
 588 {
 589         unsigned long str_len = 0, start_len = 0;
 590
 591         str_len = strlen(str);
 592         start_len = strlen(start);
 593
 594         if (str_len >= start_len &&
 595                         !strncmp(str, start, start_len))
 596                 return 1;
 597
 598         return 0;
 599 }
 600
 601 /* check hardware */
 602 static int __init acerhdf_check_hardware(void)
 603 {
 604         char const *vendor, *version, *product;
 605         const struct bios_settings *bt = NULL;
 606         int found = 0;
 607
 608         /* get BIOS data */
 609         vendor  = dmi_get_system_info(DMI_SYS_VENDOR);
 610         version = dmi_get_system_info(DMI_BIOS_VERSION);
 611         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 612
 613         if (!vendor || !version || !product) {
 614                 pr_err("error getting hardware information\n");
 615                 return -EINVAL;
 616         }
 617
 618         pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
 619
 620         if (list_supported) {
 621                 pr_info("List of supported Manufacturer/Model/BIOS:\n");
 622                 pr_info("---------------------------------------------------\n");
 623                 for (bt = bios_tbl; bt->vendor[0]; bt++) {
 624                         pr_info("%-13s | %-17s | %-10s\n", bt->vendor,
 625                                 bt->product, bt->version);
 626                 }
 627                 pr_info("---------------------------------------------------\n");
 628                 return -ECANCELED;
 629         }
 630
 631         if (force_bios[0]) {
 632                 version = force_bios;
 633                 pr_info("forcing BIOS version: %s\n", version);
 634                 kernelmode = 0;
 635         }
 636
 637         if (force_product[0]) {
 638                 product = force_product;
 639                 pr_info("forcing BIOS product: %s\n", product);
 640                 kernelmode = 0;
 641         }
 642
 643         if (verbose)
 644                 pr_info("BIOS info: %s %s, product: %s\n",
 645                         vendor, version, product);
 646
 647         /* search BIOS version and vendor in BIOS settings table */
 648         for (bt = bios_tbl; bt->vendor[0]; bt++) {
 649                 /*
 650                  * check if actual hardware BIOS vendor, product and version
 651                  * IDs start with the strings of BIOS table entry
 652                  */
 653                 if (str_starts_with(vendor, bt->vendor) &&
 654                                 str_starts_with(product, bt->product) &&
 655                                 str_starts_with(version, bt->version)) {
 656                         found = 1;
 657                         break;
 658                 }
 659         }
 660
 661         if (!found) {
 662                 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n",
 663                        vendor, product, version);
 664                 return -EINVAL;
 665         }
 666
 667         /* Copy control settings from BIOS table before we free it. */
 668         ctrl_cfg.fanreg = bt->fanreg;
 669         ctrl_cfg.tempreg = bt->tempreg;
 670         memcpy(&ctrl_cfg.cmd, &bt->cmd, sizeof(struct fancmd));
 671         ctrl_cfg.mcmd_enable = bt->mcmd_enable;
 672
 673         /*
 674          * if started with kernel mode off, prevent the kernel from switching
 675          * off the fan
 676          */
 677         if (!kernelmode) {
 678                 pr_notice("Fan control off, to enable do:\n");
 679                 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zoneN/mode # N=0,1,2...\n");
 680         }
 681
 682         return 0;
 683 }
 684
 685 static int __init acerhdf_register_platform(void)
 686 {
 687         int err = 0;
 688
 689         err = platform_driver_register(&acerhdf_driver);
 690         if (err)
 691                 return err;
 692
 693         acerhdf_dev = platform_device_alloc("acerhdf", -1);
 694         if (!acerhdf_dev) {
 695                 err = -ENOMEM;
 696                 goto err_device_alloc;
 697         }
 698         err = platform_device_add(acerhdf_dev);
 699         if (err)
 700                 goto err_device_add;
 701
 702         return 0;
 703
 704 err_device_add:
 705         platform_device_put(acerhdf_dev);
 706 err_device_alloc:
 707         platform_driver_unregister(&acerhdf_driver);
 708         return err;
 709 }
 710
 711 static void acerhdf_unregister_platform(void)
 712 {
 713         platform_device_unregister(acerhdf_dev);
 714         platform_driver_unregister(&acerhdf_driver);
 715 }
 716
 717 static int __init acerhdf_register_thermal(void)
 718 {
 719         int ret;
 720
 721         cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
 722                                                  &acerhdf_cooling_ops);
 723
 724         if (IS_ERR(cl_dev))
 725                 return -EINVAL;
 726
 727         thz_dev = thermal_zone_device_register("acerhdf", 2, 0, NULL,
 728                                               &acerhdf_dev_ops,
 729                                               &acerhdf_zone_params, 0,
 730                                               (kernelmode) ? interval*1000 : 0);
 731         if (IS_ERR(thz_dev))
 732                 return -EINVAL;
 733
 734         if (kernelmode)
 735                 ret = thermal_zone_device_enable(thz_dev);
 736         else
 737                 ret = thermal_zone_device_disable(thz_dev);
 738         if (ret)
 739                 return ret;
 740
 741         if (strcmp(thz_dev->governor->name,
 742                                 acerhdf_zone_params.governor_name)) {
 743                 pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n",
 744                                 acerhdf_zone_params.governor_name);
 745                 return -EINVAL;
 746         }
 747
 748         return 0;
 749 }
 750
 751 static void acerhdf_unregister_thermal(void)
 752 {
 753         if (cl_dev) {
 754                 thermal_cooling_device_unregister(cl_dev);
 755                 cl_dev = NULL;
 756         }
 757
 758         if (thz_dev) {
 759                 thermal_zone_device_unregister(thz_dev);
 760                 thz_dev = NULL;
 761         }
 762 }
 763
 764 static int __init acerhdf_init(void)
 765 {
 766         int err = 0;
 767
 768         err = acerhdf_check_hardware();
 769         if (err)
 770                 goto out_err;
 771
 772         err = acerhdf_register_platform();
 773         if (err)
 774                 goto out_err;
 775
 776         err = acerhdf_register_thermal();
 777         if (err)
 778                 goto err_unreg;
 779
 780         return 0;
 781
 782 err_unreg:
 783         acerhdf_unregister_thermal();
 784         acerhdf_unregister_platform();
 785
 786 out_err:
 787         return err;
 788 }
 789
 790 static void __exit acerhdf_exit(void)
 791 {
 792         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 793         acerhdf_unregister_thermal();
 794         acerhdf_unregister_platform();
 795 }
 796
 797 MODULE_LICENSE("GPL");
 798 MODULE_AUTHOR("Peter Kaestle");
 799 MODULE_DESCRIPTION("Aspire One temperature and fan driver");
 800 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
 801 MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:");
 802 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:");
 803 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:");
 804 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5755G:");
 805 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:");
 806 MODULE_ALIAS("dmi:*:*Acer*:pnAO521*:");
 807 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
 808 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5739G:");
 809 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*One*753:");
 810 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5315:");
 811 MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:");
 812 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*7551:");
 813 MODULE_ALIAS("dmi:*:*Acer*:TM8573T:");
 814 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
 815 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
 816 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:");
 817 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:");
 818 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:");
 819 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:");
 820 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:");
 821 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:");
 822 MODULE_ALIAS("dmi:*:*Acer*:pnExtensa*5420*:");
 823
 824 module_init(acerhdf_init);
 825 module_exit(acerhdf_exit);
 826
 827 static int interval_set_uint(const char *val, const struct kernel_param *kp)
 828 {
 829         int ret;
 830
 831         ret = param_set_uint(val, kp);
 832         if (ret)
 833                 return ret;
 834
 835         acerhdf_check_param(thz_dev);
 836
 837         return 0;
 838 }
 839
 840 static const struct kernel_param_ops interval_ops = {
 841         .set = interval_set_uint,
 842         .get = param_get_uint,
 843 };
 844
 845 module_param_cb(interval, &interval_ops, &interval, 0600);
 846 MODULE_PARM_DESC(interval, "Polling interval of temperature check");