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_DEFAULT_TEMP_FANON 60000
  50 #define ACERHDF_DEFAULT_TEMP_FANOFF 53000
  51 #define ACERHDF_TEMP_CRIT 89000
  52 #define ACERHDF_FAN_OFF 0
  53 #define ACERHDF_FAN_AUTO 1
  54
  55 /*
  56  * No matter what value the user puts into the fanon variable, turn on the fan
  57  * at 80 degree Celsius to prevent hardware damage
  58  */
  59 #define ACERHDF_MAX_FANON 80000
  60
  61 /*
  62  * Maximum interval between two temperature checks is 15 seconds, as the die
  63  * can get hot really fast under heavy load (plus we shouldn't forget about
  64  * possible impact of _external_ aggressive sources such as heaters, sun etc.)
  65  */
  66 #define ACERHDF_MAX_INTERVAL 15
  67
  68 #ifdef START_IN_KERNEL_MODE
  69 static int kernelmode = 1;
  70 #else
  71 static int kernelmode;
  72 #endif
  73
  74 static unsigned int interval = 10;
  75 static unsigned int fanon = ACERHDF_DEFAULT_TEMP_FANON;
  76 static unsigned int fanoff = ACERHDF_DEFAULT_TEMP_FANOFF;
  77 static unsigned int verbose;
  78 static unsigned int list_supported;
  79 static unsigned int fanstate = ACERHDF_FAN_AUTO;
  80 static char force_bios[16];
  81 static char force_product[16];
  82 static struct thermal_zone_device *thz_dev;
  83 static struct thermal_cooling_device *cl_dev;
  84 static struct platform_device *acerhdf_dev;
  85
  86 module_param(kernelmode, uint, 0);
  87 MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off");
  88 module_param(fanon, uint, 0600);
  89 MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature");
  90 module_param(fanoff, uint, 0600);
  91 MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature");
  92 module_param(verbose, uint, 0600);
  93 MODULE_PARM_DESC(verbose, "Enable verbose dmesg output");
  94 module_param(list_supported, uint, 0600);
  95 MODULE_PARM_DESC(list_supported, "List supported models and BIOS versions");
  96 module_param_string(force_bios, force_bios, 16, 0);
  97 MODULE_PARM_DESC(force_bios, "Pretend system has this known supported BIOS version");
  98 module_param_string(force_product, force_product, 16, 0);
  99 MODULE_PARM_DESC(force_product, "Pretend system is this known supported model");
 100
 101 /*
 102  * cmd_off: to switch the fan completely off and check if the fan is off
 103  *      cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then
 104  *              the fan speed depending on the temperature
 105  */
 106 struct fancmd {
 107         u8 cmd_off;
 108         u8 cmd_auto;
 109 };
 110
 111 struct manualcmd {
 112         u8 mreg;
 113         u8 moff;
 114 };
 115
 116 /* default register and command to disable fan in manual mode */
 117 static const struct manualcmd mcmd = {
 118         .mreg = 0x94,
 119         .moff = 0xff,
 120 };
 121
 122 /* BIOS settings - only used during probe */
 123 struct bios_settings {
 124         const char *vendor;
 125         const char *product;
 126         const char *version;
 127         u8 fanreg;
 128         u8 tempreg;
 129         struct fancmd cmd;
 130         int mcmd_enable;
 131 };
 132
 133 /* This could be a daughter struct in the above, but not worth the redirect */
 134 struct ctrl_settings {
 135         u8 fanreg;
 136         u8 tempreg;
 137         struct fancmd cmd;
 138         int mcmd_enable;
 139 };
 140
 141 static struct thermal_trip trips[] = {
 142         [0] = { .temperature = ACERHDF_DEFAULT_TEMP_FANON,
 143                 .hysteresis = ACERHDF_DEFAULT_TEMP_FANON - ACERHDF_DEFAULT_TEMP_FANOFF,
 144                 .type = THERMAL_TRIP_ACTIVE },
 145
 146         [1] = { .temperature = ACERHDF_TEMP_CRIT,
 147                 .type = THERMAL_TRIP_CRITICAL }
 148 };
 149
 150 static struct ctrl_settings ctrl_cfg __read_mostly;
 151
 152 /* Register addresses and values for different BIOS versions */
 153 static const struct bios_settings bios_tbl[] __initconst = {
 154         /* AOA110 */
 155         {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00}, 0},
 156         {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0},
 157         {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00}, 0},
 158         {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00}, 0},
 159         {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00}, 0},
 160         {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00}, 0},
 161         {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00}, 0},
 162         {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00}, 0},
 163         {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00}, 0},
 164         /* AOA150 */
 165         {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0},
 166         {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00}, 0},
 167         {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0},
 168         {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00}, 0},
 169         {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00}, 0},
 170         {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00}, 0},
 171         {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00}, 0},
 172         {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0},
 173         /* LT1005u */
 174         {"Acer", "LT-10Q", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0},
 175         /* Acer 1410 */
 176         {"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
 177         {"Acer", "Aspire 1410", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
 178         {"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
 179         {"Acer", "Aspire 1410", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
 180         {"Acer", "Aspire 1410", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
 181         {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
 182         {"Acer", "Aspire 1410", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
 183         {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
 184         {"Acer", "Aspire 1410", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
 185         {"Acer", "Aspire 1410", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
 186         {"Acer", "Aspire 1410", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
 187         /* Acer 1810xx */
 188         {"Acer", "Aspire 1810TZ", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
 189         {"Acer", "Aspire 1810T",  "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
 190         {"Acer", "Aspire 1810TZ", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
 191         {"Acer", "Aspire 1810T",  "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
 192         {"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
 193         {"Acer", "Aspire 1810T",  "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
 194         {"Acer", "Aspire 1810TZ", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
 195         {"Acer", "Aspire 1810T",  "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
 196         {"Acer", "Aspire 1810TZ", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
 197         {"Acer", "Aspire 1810T",  "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
 198         {"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
 199         {"Acer", "Aspire 1810T",  "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
 200         {"Acer", "Aspire 1810TZ", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
 201         {"Acer", "Aspire 1810T",  "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
 202         {"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
 203         {"Acer", "Aspire 1810T",  "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
 204         {"Acer", "Aspire 1810TZ", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
 205         {"Acer", "Aspire 1810T",  "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
 206         {"Acer", "Aspire 1810TZ", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
 207         {"Acer", "Aspire 1810T",  "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
 208         {"Acer", "Aspire 1810TZ", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
 209         {"Acer", "Aspire 1810T",  "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
 210         /* Acer 5755G */
 211         {"Acer", "Aspire 5755G",  "V1.20",   0xab, 0xb4, {0x00, 0x08}, 0},
 212         {"Acer", "Aspire 5755G",  "V1.21",   0xab, 0xb3, {0x00, 0x08}, 0},
 213         /* Acer 521 */
 214         {"Acer", "AO521", "V1.11", 0x55, 0x58, {0x1f, 0x00}, 0},
 215         /* Acer 531 */
 216         {"Acer", "AO531h", "v0.3104", 0x55, 0x58, {0x20, 0x00}, 0},
 217         {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00}, 0},
 218         {"Acer", "AO531h", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0},
 219         /* Acer 751 */
 220         {"Acer", "AO751h", "V0.3206", 0x55, 0x58, {0x21, 0x00}, 0},
 221         {"Acer", "AO751h", "V0.3212", 0x55, 0x58, {0x21, 0x00}, 0},
 222         /* Acer 753 */
 223         {"Acer", "Aspire One 753", "V1.24", 0x93, 0xac, {0x14, 0x04}, 1},
 224         /* Acer 1825 */
 225         {"Acer", "Aspire 1825PTZ", "V1.3118", 0x55, 0x58, {0x9e, 0x00}, 0},
 226         {"Acer", "Aspire 1825PTZ", "V1.3127", 0x55, 0x58, {0x9e, 0x00}, 0},
 227         /* Acer Extensa 5420 */
 228         {"Acer", "Extensa 5420", "V1.17", 0x93, 0xac, {0x14, 0x04}, 1},
 229         /* Acer Aspire 5315 */
 230         {"Acer", "Aspire 5315", "V1.19", 0x93, 0xac, {0x14, 0x04}, 1},
 231         /* Acer Aspire 5739 */
 232         {"Acer", "Aspire 5739G", "V1.3311", 0x55, 0x58, {0x20, 0x00}, 0},
 233         /* Acer TravelMate 7730 */
 234         {"Acer", "TravelMate 7730G", "v0.3509", 0x55, 0x58, {0xaf, 0x00}, 0},
 235         /* Acer Aspire 7551 */
 236         {"Acer", "Aspire 7551", "V1.18", 0x93, 0xa8, {0x14, 0x04}, 1},
 237         /* Acer TravelMate TM8573T */
 238         {"Acer", "TM8573T", "V1.13", 0x93, 0xa8, {0x14, 0x04}, 1},
 239         /* Gateway */
 240         {"Gateway", "AOA110", "v0.3103",  0x55, 0x58, {0x21, 0x00}, 0},
 241         {"Gateway", "AOA150", "v0.3103",  0x55, 0x58, {0x20, 0x00}, 0},
 242         {"Gateway", "LT31",   "v1.3103",  0x55, 0x58, {0x9e, 0x00}, 0},
 243         {"Gateway", "LT31",   "v1.3201",  0x55, 0x58, {0x9e, 0x00}, 0},
 244         {"Gateway", "LT31",   "v1.3302",  0x55, 0x58, {0x9e, 0x00}, 0},
 245         {"Gateway", "LT31",   "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0},
 246         {"Gateway", "LT31",   "v1.3307",  0x55, 0x58, {0x9e, 0x00}, 0},
 247         /* Packard Bell */
 248         {"Packard Bell", "DOA150",  "v0.3104",  0x55, 0x58, {0x21, 0x00}, 0},
 249         {"Packard Bell", "DOA150",  "v0.3105",  0x55, 0x58, {0x20, 0x00}, 0},
 250         {"Packard Bell", "AOA110",  "v0.3105",  0x55, 0x58, {0x21, 0x00}, 0},
 251         {"Packard Bell", "AOA150",  "v0.3105",  0x55, 0x58, {0x20, 0x00}, 0},
 252         {"Packard Bell", "ENBFT",   "V1.3118",  0x55, 0x58, {0x9e, 0x00}, 0},
 253         {"Packard Bell", "ENBFT",   "V1.3127",  0x55, 0x58, {0x9e, 0x00}, 0},
 254         {"Packard Bell", "DOTMU",   "v1.3303",  0x55, 0x58, {0x9e, 0x00}, 0},
 255         {"Packard Bell", "DOTMU",   "v0.3120",  0x55, 0x58, {0x9e, 0x00}, 0},
 256         {"Packard Bell", "DOTMU",   "v0.3108",  0x55, 0x58, {0x9e, 0x00}, 0},
 257         {"Packard Bell", "DOTMU",   "v0.3113",  0x55, 0x58, {0x9e, 0x00}, 0},
 258         {"Packard Bell", "DOTMU",   "v0.3115",  0x55, 0x58, {0x9e, 0x00}, 0},
 259         {"Packard Bell", "DOTMU",   "v0.3117",  0x55, 0x58, {0x9e, 0x00}, 0},
 260         {"Packard Bell", "DOTMU",   "v0.3119",  0x55, 0x58, {0x9e, 0x00}, 0},
 261         {"Packard Bell", "DOTMU",   "v1.3204",  0x55, 0x58, {0x9e, 0x00}, 0},
 262         {"Packard Bell", "DOTMA",   "v1.3201",  0x55, 0x58, {0x9e, 0x00}, 0},
 263         {"Packard Bell", "DOTMA",   "v1.3302",  0x55, 0x58, {0x9e, 0x00}, 0},
 264         {"Packard Bell", "DOTMA",   "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0},
 265         {"Packard Bell", "DOTVR46", "v1.3308",  0x55, 0x58, {0x9e, 0x00}, 0},
 266         /* pewpew-terminator */
 267         {"", "", "", 0, 0, {0, 0}, 0}
 268 };
 269
 270 /*
 271  * this struct is used to instruct thermal layer to use bang_bang instead of
 272  * default governor for acerhdf
 273  */
 274 static struct thermal_zone_params acerhdf_zone_params = {
 275         .governor_name = "bang_bang",
 276 };
 277
 278 static int acerhdf_get_temp(int *temp)
 279 {
 280         u8 read_temp;
 281
 282         if (ec_read(ctrl_cfg.tempreg, &read_temp))
 283                 return -EINVAL;
 284
 285         *temp = read_temp * 1000;
 286
 287         return 0;
 288 }
 289
 290 static int acerhdf_get_fanstate(int *state)
 291 {
 292         u8 fan;
 293
 294         if (ec_read(ctrl_cfg.fanreg, &fan))
 295                 return -EINVAL;
 296
 297         if (fan != ctrl_cfg.cmd.cmd_off)
 298                 *state = ACERHDF_FAN_AUTO;
 299         else
 300                 *state = ACERHDF_FAN_OFF;
 301
 302         return 0;
 303 }
 304
 305 static void acerhdf_change_fanstate(int state)
 306 {
 307         unsigned char cmd;
 308
 309         if (verbose)
 310                 pr_notice("fan %s\n", state == ACERHDF_FAN_OFF ? "OFF" : "ON");
 311
 312         if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
 313                 pr_err("invalid fan state %d requested, setting to auto!\n",
 314                        state);
 315                 state = ACERHDF_FAN_AUTO;
 316         }
 317
 318         cmd = (state == ACERHDF_FAN_OFF) ? ctrl_cfg.cmd.cmd_off
 319                                          : ctrl_cfg.cmd.cmd_auto;
 320         fanstate = state;
 321
 322         ec_write(ctrl_cfg.fanreg, cmd);
 323
 324         if (ctrl_cfg.mcmd_enable && state == ACERHDF_FAN_OFF) {
 325                 if (verbose)
 326                         pr_notice("turning off fan manually\n");
 327                 ec_write(mcmd.mreg, mcmd.moff);
 328         }
 329 }
 330
 331 static void acerhdf_check_param(struct thermal_zone_device *thermal)
 332 {
 333         if (fanon > ACERHDF_MAX_FANON) {
 334                 pr_err("fanon temperature too high, set to %d\n",
 335                        ACERHDF_MAX_FANON);
 336                 fanon = ACERHDF_MAX_FANON;
 337         }
 338
 339         if (fanon < fanoff) {
 340                 pr_err("fanoff temperature (%d) is above fanon temperature (%d), clamping to %d\n",
 341                        fanoff, fanon, fanon);
 342                 fanoff = fanon;
 343         }
 344
 345         trips[0].temperature = fanon;
 346         trips[0].hysteresis  = fanon - fanoff;
 347
 348         if (kernelmode) {
 349                 if (interval > ACERHDF_MAX_INTERVAL) {
 350                         pr_err("interval too high, set to %d\n",
 351                                ACERHDF_MAX_INTERVAL);
 352                         interval = ACERHDF_MAX_INTERVAL;
 353                 }
 354
 355                 if (verbose)
 356                         pr_notice("interval changed to: %d\n", interval);
 357         }
 358 }
 359
 360 /*
 361  * This is the thermal zone callback which does the delayed polling of the fan
 362  * state. We do check /sysfs-originating settings here in acerhdf_check_param()
 363  * as late as the polling interval is since we can't do that in the respective
 364  * accessors of the module parameters.
 365  */
 366 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, int *t)
 367 {
 368         int temp, err = 0;
 369
 370         err = acerhdf_get_temp(&temp);
 371         if (err)
 372                 return err;
 373
 374         if (verbose)
 375                 pr_notice("temp %d\n", temp);
 376
 377         *t = temp;
 378         return 0;
 379 }
 380
 381 static bool acerhdf_should_bind(struct thermal_zone_device *thermal,
 382                                 const struct thermal_trip *trip,
 383                                 struct thermal_cooling_device *cdev,
 384                                 struct cooling_spec *c)
 385 {
 386         /* if the cooling device is the one from acerhdf bind it */
 387         return cdev == cl_dev && trip->type == THERMAL_TRIP_ACTIVE;
 388 }
 389
 390 static inline void acerhdf_revert_to_bios_mode(void)
 391 {
 392         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 393         kernelmode = 0;
 394
 395         pr_notice("kernel mode fan control OFF\n");
 396 }
 397 static inline void acerhdf_enable_kernelmode(void)
 398 {
 399         kernelmode = 1;
 400
 401         pr_notice("kernel mode fan control ON\n");
 402 }
 403
 404 /*
 405  * set operation mode;
 406  * enabled: the thermal layer of the kernel takes care about
 407  *          the temperature and the fan.
 408  * disabled: the BIOS takes control of the fan.
 409  */
 410 static int acerhdf_change_mode(struct thermal_zone_device *thermal,
 411                                enum thermal_device_mode mode)
 412 {
 413         if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
 414                 acerhdf_revert_to_bios_mode();
 415         else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
 416                 acerhdf_enable_kernelmode();
 417
 418         return 0;
 419 }
 420
 421 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
 422                                  int *temperature)
 423 {
 424         *temperature = ACERHDF_TEMP_CRIT;
 425         return 0;
 426 }
 427
 428 /* bind callback functions to thermalzone */
 429 static struct thermal_zone_device_ops acerhdf_dev_ops = {
 430         .should_bind = acerhdf_should_bind,
 431         .get_temp = acerhdf_get_ec_temp,
 432         .change_mode = acerhdf_change_mode,
 433         .get_crit_temp = acerhdf_get_crit_temp,
 434 };
 435
 436 /*
 437  * cooling device callback functions
 438  * get maximal fan cooling state
 439  */
 440 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
 441                                  unsigned long *state)
 442 {
 443         *state = 1;
 444
 445         return 0;
 446 }
 447
 448 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
 449                                  unsigned long *state)
 450 {
 451         int err = 0, tmp;
 452
 453         err = acerhdf_get_fanstate(&tmp);
 454         if (err)
 455                 return err;
 456
 457         *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
 458         return 0;
 459 }
 460
 461 /* change current fan state - is overwritten when running in kernel mode */
 462 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
 463                                  unsigned long state)
 464 {
 465         int cur_temp, cur_state, err = 0;
 466
 467         if (!kernelmode)
 468                 return 0;
 469
 470         err = acerhdf_get_temp(&cur_temp);
 471         if (err) {
 472                 pr_err("error reading temperature, hand off control to BIOS\n");
 473                 goto err_out;
 474         }
 475
 476         err = acerhdf_get_fanstate(&cur_state);
 477         if (err) {
 478                 pr_err("error reading fan state, hand off control to BIOS\n");
 479                 goto err_out;
 480         }
 481
 482         if (state == 0) {
 483                 if (cur_state == ACERHDF_FAN_AUTO)
 484                         acerhdf_change_fanstate(ACERHDF_FAN_OFF);
 485         } else {
 486                 if (cur_state == ACERHDF_FAN_OFF)
 487                         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 488         }
 489         return 0;
 490
 491 err_out:
 492         acerhdf_revert_to_bios_mode();
 493         return -EINVAL;
 494 }
 495
 496 /* bind fan callbacks to fan device */
 497 static const struct thermal_cooling_device_ops acerhdf_cooling_ops = {
 498         .get_max_state = acerhdf_get_max_state,
 499         .get_cur_state = acerhdf_get_cur_state,
 500         .set_cur_state = acerhdf_set_cur_state,
 501 };
 502
 503 /* suspend / resume functionality */
 504 static int acerhdf_suspend(struct device *dev)
 505 {
 506         if (kernelmode)
 507                 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 508
 509         if (verbose)
 510                 pr_notice("going suspend\n");
 511
 512         return 0;
 513 }
 514
 515 static int acerhdf_probe(struct platform_device *device)
 516 {
 517         return 0;
 518 }
 519
 520 static const struct dev_pm_ops acerhdf_pm_ops = {
 521         .suspend = acerhdf_suspend,
 522         .freeze  = acerhdf_suspend,
 523 };
 524
 525 static struct platform_driver acerhdf_driver = {
 526         .driver = {
 527                 .name  = "acerhdf",
 528                 .pm    = &acerhdf_pm_ops,
 529         },
 530         .probe = acerhdf_probe,
 531 };
 532
 533 /* check hardware */
 534 static int __init acerhdf_check_hardware(void)
 535 {
 536         char const *vendor, *version, *product;
 537         const struct bios_settings *bt = NULL;
 538         int found = 0;
 539
 540         /* get BIOS data */
 541         vendor  = dmi_get_system_info(DMI_SYS_VENDOR);
 542         version = dmi_get_system_info(DMI_BIOS_VERSION);
 543         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 544
 545         if (!vendor || !version || !product) {
 546                 pr_err("error getting hardware information\n");
 547                 return -EINVAL;
 548         }
 549
 550         pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
 551
 552         if (list_supported) {
 553                 pr_info("List of supported Manufacturer/Model/BIOS:\n");
 554                 pr_info("---------------------------------------------------\n");
 555                 for (bt = bios_tbl; bt->vendor[0]; bt++) {
 556                         pr_info("%-13s | %-17s | %-10s\n", bt->vendor,
 557                                 bt->product, bt->version);
 558                 }
 559                 pr_info("---------------------------------------------------\n");
 560                 return -ECANCELED;
 561         }
 562
 563         if (force_bios[0]) {
 564                 version = force_bios;
 565                 pr_info("forcing BIOS version: %s\n", version);
 566                 kernelmode = 0;
 567         }
 568
 569         if (force_product[0]) {
 570                 product = force_product;
 571                 pr_info("forcing BIOS product: %s\n", product);
 572                 kernelmode = 0;
 573         }
 574
 575         if (verbose)
 576                 pr_info("BIOS info: %s %s, product: %s\n",
 577                         vendor, version, product);
 578
 579         /* search BIOS version and vendor in BIOS settings table */
 580         for (bt = bios_tbl; bt->vendor[0]; bt++) {
 581                 /*
 582                  * check if actual hardware BIOS vendor, product and version
 583                  * IDs start with the strings of BIOS table entry
 584                  */
 585                 if (strstarts(vendor, bt->vendor) &&
 586                     strstarts(product, bt->product) &&
 587                     strstarts(version, bt->version)) {
 588                         found = 1;
 589                         break;
 590                 }
 591         }
 592
 593         if (!found) {
 594                 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n",
 595                        vendor, product, version);
 596                 return -EINVAL;
 597         }
 598
 599         /* Copy control settings from BIOS table before we free it. */
 600         ctrl_cfg.fanreg = bt->fanreg;
 601         ctrl_cfg.tempreg = bt->tempreg;
 602         memcpy(&ctrl_cfg.cmd, &bt->cmd, sizeof(struct fancmd));
 603         ctrl_cfg.mcmd_enable = bt->mcmd_enable;
 604
 605         /*
 606          * if started with kernel mode off, prevent the kernel from switching
 607          * off the fan
 608          */
 609         if (!kernelmode) {
 610                 pr_notice("Fan control off, to enable do:\n");
 611                 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zoneN/mode # N=0,1,2...\n");
 612         }
 613
 614         return 0;
 615 }
 616
 617 static int __init acerhdf_register_platform(void)
 618 {
 619         int err = 0;
 620
 621         err = platform_driver_register(&acerhdf_driver);
 622         if (err)
 623                 return err;
 624
 625         acerhdf_dev = platform_device_alloc("acerhdf", PLATFORM_DEVID_NONE);
 626         if (!acerhdf_dev) {
 627                 err = -ENOMEM;
 628                 goto err_device_alloc;
 629         }
 630         err = platform_device_add(acerhdf_dev);
 631         if (err)
 632                 goto err_device_add;
 633
 634         return 0;
 635
 636 err_device_add:
 637         platform_device_put(acerhdf_dev);
 638 err_device_alloc:
 639         platform_driver_unregister(&acerhdf_driver);
 640         return err;
 641 }
 642
 643 static void acerhdf_unregister_platform(void)
 644 {
 645         platform_device_unregister(acerhdf_dev);
 646         platform_driver_unregister(&acerhdf_driver);
 647 }
 648
 649 static int __init acerhdf_register_thermal(void)
 650 {
 651         int ret;
 652
 653         cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
 654                                                  &acerhdf_cooling_ops);
 655
 656         if (IS_ERR(cl_dev))
 657                 return -EINVAL;
 658
 659         thz_dev = thermal_zone_device_register_with_trips("acerhdf", trips, ARRAY_SIZE(trips),
 660                                                           NULL, &acerhdf_dev_ops,
 661                                                           &acerhdf_zone_params, 0,
 662                                                           (kernelmode) ? interval*1000 : 0);
 663         if (IS_ERR(thz_dev))
 664                 return -EINVAL;
 665
 666         if (kernelmode)
 667                 ret = thermal_zone_device_enable(thz_dev);
 668         else
 669                 ret = thermal_zone_device_disable(thz_dev);
 670         if (ret)
 671                 return ret;
 672
 673         return 0;
 674 }
 675
 676 static void acerhdf_unregister_thermal(void)
 677 {
 678         if (cl_dev) {
 679                 thermal_cooling_device_unregister(cl_dev);
 680                 cl_dev = NULL;
 681         }
 682
 683         if (thz_dev) {
 684                 thermal_zone_device_unregister(thz_dev);
 685                 thz_dev = NULL;
 686         }
 687 }
 688
 689 static int __init acerhdf_init(void)
 690 {
 691         int err = 0;
 692
 693         err = acerhdf_check_hardware();
 694         if (err)
 695                 goto out_err;
 696
 697         err = acerhdf_register_platform();
 698         if (err)
 699                 goto out_err;
 700
 701         err = acerhdf_register_thermal();
 702         if (err)
 703                 goto err_unreg;
 704
 705         return 0;
 706
 707 err_unreg:
 708         acerhdf_unregister_thermal();
 709         acerhdf_unregister_platform();
 710
 711 out_err:
 712         return err;
 713 }
 714
 715 static void __exit acerhdf_exit(void)
 716 {
 717         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 718         acerhdf_unregister_thermal();
 719         acerhdf_unregister_platform();
 720 }
 721
 722 MODULE_LICENSE("GPL");
 723 MODULE_AUTHOR("Peter Kaestle");
 724 MODULE_DESCRIPTION("Aspire One temperature and fan driver");
 725 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
 726 MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:");
 727 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:");
 728 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:");
 729 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5755G:");
 730 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:");
 731 MODULE_ALIAS("dmi:*:*Acer*:pnAO521*:");
 732 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
 733 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5739G:");
 734 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*One*753:");
 735 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5315:");
 736 MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:");
 737 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*7551:");
 738 MODULE_ALIAS("dmi:*:*Acer*:TM8573T:");
 739 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
 740 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
 741 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:");
 742 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:");
 743 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:");
 744 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:");
 745 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:");
 746 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:");
 747 MODULE_ALIAS("dmi:*:*Acer*:pnExtensa*5420*:");
 748
 749 module_init(acerhdf_init);
 750 module_exit(acerhdf_exit);
 751
 752 static int interval_set_uint(const char *val, const struct kernel_param *kp)
 753 {
 754         int ret;
 755
 756         ret = param_set_uint(val, kp);
 757         if (ret)
 758                 return ret;
 759
 760         acerhdf_check_param(thz_dev);
 761
 762         return 0;
 763 }
 764
 765 static const struct kernel_param_ops interval_ops = {
 766         .set = interval_set_uint,
 767         .get = param_get_uint,
 768 };
 769
 770 module_param_cb(interval, &interval_ops, &interval, 0000);
 771 MODULE_PARM_DESC(interval, "Polling interval of temperature check");