root/drivers/platform/x86/acerhdf.c

DEFINITIONS

1. acerhdf_get_temp
2. acerhdf_get_fanstate
3. acerhdf_change_fanstate
4. acerhdf_check_param
5. acerhdf_get_ec_temp
6. acerhdf_bind
7. acerhdf_unbind
8. acerhdf_revert_to_bios_mode
9. acerhdf_enable_kernelmode
10. acerhdf_get_mode
11. acerhdf_set_mode
12. acerhdf_get_trip_type
13. acerhdf_get_trip_hyst
14. acerhdf_get_trip_temp
15. acerhdf_get_crit_temp
16. acerhdf_get_max_state
17. acerhdf_get_cur_state
18. acerhdf_set_cur_state
19. acerhdf_suspend
20. acerhdf_probe
21. acerhdf_remove
22. str_starts_with
23. acerhdf_check_hardware
24. acerhdf_register_platform
25. acerhdf_unregister_platform
26. acerhdf_register_thermal
27. acerhdf_unregister_thermal
28. acerhdf_init
29. acerhdf_exit

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