drivers/platform/x86/acerhdf.c

   1 /*
   2  * acerhdf - A driver which monitors the temperature
   3  *           of the aspire one netbook, turns on/off the fan
   4  *           as soon as the upper/lower threshold is reached.
   5  *
   6  * (C) 2009 - Peter Feuerer     peter (a) piie.net
   7  *                              http://piie.net
   8  *     2009 Borislav Petkov <petkovbb@gmail.com>
   9  *
  10  * Inspired by and many thanks to:
  11  *  o acerfand   - Rachel Greenham
  12  *  o acer_ec.pl - Michael Kurz     michi.kurz (at) googlemail.com
  13  *               - Petr Tomasek     tomasek (#) etf,cuni,cz
  14  *               - Carlos Corbacho  cathectic (at) gmail.com
  15  *  o lkml       - Matthew Garrett
  16  *               - Borislav Petkov
  17  *               - Andreas Mohr
  18  *
  19  *  This program is free software; you can redistribute it and/or modify
  20  *  it under the terms of the GNU General Public License as published by
  21  *  the Free Software Foundation; either version 2 of the License, or
  22  *  (at your option) any later version.
  23  *
  24  *  This program is distributed in the hope that it will be useful,
  25  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  *  GNU General Public License for more details.
  28  *
  29  *  You should have received a copy of the GNU General Public License
  30  *  along with this program; if not, write to the Free Software
  31  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  32  */
  33
  34 #define pr_fmt(fmt) "acerhdf: " fmt
  35
  36 #include <linux/kernel.h>
  37 #include <linux/module.h>
  38 #include <linux/fs.h>
  39 #include <linux/dmi.h>
  40 #include <acpi/acpi_drivers.h>
  41 #include <linux/sched.h>
  42 #include <linux/thermal.h>
  43 #include <linux/platform_device.h>
  44
  45 /*
  46  * The driver is started with "kernel mode off" by default. That means, the BIOS
  47  * is still in control of the fan. In this mode the driver allows to read the
  48  * temperature of the cpu and a userspace tool may take over control of the fan.
  49  * If the driver is switched to "kernel mode" (e.g. via module parameter) the
  50  * driver is in full control of the fan. If you want the module to be started in
  51  * kernel mode by default, define the following:
  52  */
  53 #undef START_IN_KERNEL_MODE
  54
  55 #define DRV_VER "0.5.18"
  56
  57 /*
  58  * According to the Atom N270 datasheet,
  59  * (http://download.intel.com/design/processor/datashts/320032.pdf) the
  60  * CPU's optimal operating limits denoted in junction temperature as
  61  * measured by the on-die thermal monitor are within 0 <= Tj <= 90. So,
  62  * assume 89°C is critical temperature.
  63  */
  64 #define ACERHDF_TEMP_CRIT 89000
  65 #define ACERHDF_FAN_OFF 0
  66 #define ACERHDF_FAN_AUTO 1
  67
  68 /*
  69  * No matter what value the user puts into the fanon variable, turn on the fan
  70  * at 80 degree Celsius to prevent hardware damage
  71  */
  72 #define ACERHDF_MAX_FANON 80000
  73
  74 /*
  75  * Maximum interval between two temperature checks is 15 seconds, as the die
  76  * can get hot really fast under heavy load (plus we shouldn't forget about
  77  * possible impact of _external_ aggressive sources such as heaters, sun etc.)
  78  */
  79 #define ACERHDF_MAX_INTERVAL 15
  80
  81 #ifdef START_IN_KERNEL_MODE
  82 static int kernelmode = 1;
  83 #else
  84 static int kernelmode;
  85 #endif
  86
  87 static unsigned int interval = 10;
  88 static unsigned int fanon = 63000;
  89 static unsigned int fanoff = 58000;
  90 static unsigned int verbose;
  91 static unsigned int fanstate = ACERHDF_FAN_AUTO;
  92 static char force_bios[16];
  93 static char force_product[16];
  94 static unsigned int prev_interval;
  95 struct thermal_zone_device *thz_dev;
  96 struct thermal_cooling_device *cl_dev;
  97 struct platform_device *acerhdf_dev;
  98
  99 module_param(kernelmode, uint, 0);
 100 MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off");
 101 module_param(interval, uint, 0600);
 102 MODULE_PARM_DESC(interval, "Polling interval of temperature check");
 103 module_param(fanon, uint, 0600);
 104 MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature");
 105 module_param(fanoff, uint, 0600);
 106 MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature");
 107 module_param(verbose, uint, 0600);
 108 MODULE_PARM_DESC(verbose, "Enable verbose dmesg output");
 109 module_param_string(force_bios, force_bios, 16, 0);
 110 MODULE_PARM_DESC(force_bios, "Force BIOS version and omit BIOS check");
 111 module_param_string(force_product, force_product, 16, 0);
 112 MODULE_PARM_DESC(force_product, "Force BIOS product and omit BIOS check");
 113
 114 /*
 115  * cmd_off: to switch the fan completely off / to check if the fan is off
 116  *      cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then
 117  *              the fan speed depending on the temperature
 118  */
 119 struct fancmd {
 120         u8 cmd_off;
 121         u8 cmd_auto;
 122 };
 123
 124 /* BIOS settings */
 125 struct bios_settings_t {
 126         const char *vendor;
 127         const char *product;
 128         const char *version;
 129         unsigned char fanreg;
 130         unsigned char tempreg;
 131         struct fancmd cmd;
 132 };
 133
 134 /* Register addresses and values for different BIOS versions */
 135 static const struct bios_settings_t bios_tbl[] = {
 136         /* AOA110 */
 137         {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00} },
 138         {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00} },
 139         {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00} },
 140         {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00} },
 141         {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00} },
 142         {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00} },
 143         {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00} },
 144         {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00} },
 145         {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00} },
 146         /* AOA150 */
 147         {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x20, 0x00} },
 148         {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00} },
 149         {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00} },
 150         {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00} },
 151         {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00} },
 152         {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00} },
 153         {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00} },
 154         {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00} },
 155         /* special BIOS / other */
 156         {"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x00} },
 157         {"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x00} },
 158         {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00} },
 159         {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00} },
 160         {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} },
 161         /* pewpew-terminator */
 162         {"", "", "", 0, 0, {0, 0} }
 163 };
 164
 165 static const struct bios_settings_t *bios_cfg __read_mostly;
 166
 167 static int acerhdf_get_temp(int *temp)
 168 {
 169         u8 read_temp;
 170
 171         if (ec_read(bios_cfg->tempreg, &read_temp))
 172                 return -EINVAL;
 173
 174         *temp = read_temp * 1000;
 175
 176         return 0;
 177 }
 178
 179 static int acerhdf_get_fanstate(int *state)
 180 {
 181         u8 fan;
 182
 183         if (ec_read(bios_cfg->fanreg, &fan))
 184                 return -EINVAL;
 185
 186         if (fan != bios_cfg->cmd.cmd_off)
 187                 *state = ACERHDF_FAN_AUTO;
 188         else
 189                 *state = ACERHDF_FAN_OFF;
 190
 191         return 0;
 192 }
 193
 194 static void acerhdf_change_fanstate(int state)
 195 {
 196         unsigned char cmd;
 197
 198         if (verbose)
 199                 pr_notice("fan %s\n", (state == ACERHDF_FAN_OFF) ?
 200                                 "OFF" : "ON");
 201
 202         if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
 203                 pr_err("invalid fan state %d requested, setting to auto!\n",
 204                         state);
 205                 state = ACERHDF_FAN_AUTO;
 206         }
 207
 208         cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off
 209                                          : bios_cfg->cmd.cmd_auto;
 210         fanstate = state;
 211
 212         ec_write(bios_cfg->fanreg, cmd);
 213 }
 214
 215 static void acerhdf_check_param(struct thermal_zone_device *thermal)
 216 {
 217         if (fanon > ACERHDF_MAX_FANON) {
 218                 pr_err("fanon temperature too high, set to %d\n",
 219                                 ACERHDF_MAX_FANON);
 220                 fanon = ACERHDF_MAX_FANON;
 221         }
 222
 223         if (kernelmode && prev_interval != interval) {
 224                 if (interval > ACERHDF_MAX_INTERVAL) {
 225                         pr_err("interval too high, set to %d\n",
 226                                 ACERHDF_MAX_INTERVAL);
 227                         interval = ACERHDF_MAX_INTERVAL;
 228                 }
 229                 if (verbose)
 230                         pr_notice("interval changed to: %d\n",
 231                                         interval);
 232                 thermal->polling_delay = interval*1000;
 233                 prev_interval = interval;
 234         }
 235 }
 236
 237 /*
 238  * This is the thermal zone callback which does the delayed polling of the fan
 239  * state. We do check /sysfs-originating settings here in acerhdf_check_param()
 240  * as late as the polling interval is since we can't do that in the respective
 241  * accessors of the module parameters.
 242  */
 243 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal,
 244                                unsigned long *t)
 245 {
 246         int temp, err = 0;
 247
 248         acerhdf_check_param(thermal);
 249
 250         err = acerhdf_get_temp(&temp);
 251         if (err)
 252                 return err;
 253
 254         if (verbose)
 255                 pr_notice("temp %d\n", temp);
 256
 257         *t = temp;
 258         return 0;
 259 }
 260
 261 static int acerhdf_bind(struct thermal_zone_device *thermal,
 262                         struct thermal_cooling_device *cdev)
 263 {
 264         /* if the cooling device is the one from acerhdf bind it */
 265         if (cdev != cl_dev)
 266                 return 0;
 267
 268         if (thermal_zone_bind_cooling_device(thermal, 0, cdev)) {
 269                 pr_err("error binding cooling dev\n");
 270                 return -EINVAL;
 271         }
 272         return 0;
 273 }
 274
 275 static int acerhdf_unbind(struct thermal_zone_device *thermal,
 276                           struct thermal_cooling_device *cdev)
 277 {
 278         if (cdev != cl_dev)
 279                 return 0;
 280
 281         if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
 282                 pr_err("error unbinding cooling dev\n");
 283                 return -EINVAL;
 284         }
 285         return 0;
 286 }
 287
 288 static inline void acerhdf_revert_to_bios_mode(void)
 289 {
 290         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 291         kernelmode = 0;
 292         if (thz_dev)
 293                 thz_dev->polling_delay = 0;
 294         pr_notice("kernel mode fan control OFF\n");
 295 }
 296 static inline void acerhdf_enable_kernelmode(void)
 297 {
 298         kernelmode = 1;
 299
 300         thz_dev->polling_delay = interval*1000;
 301         thermal_zone_device_update(thz_dev);
 302         pr_notice("kernel mode fan control ON\n");
 303 }
 304
 305 static int acerhdf_get_mode(struct thermal_zone_device *thermal,
 306                             enum thermal_device_mode *mode)
 307 {
 308         if (verbose)
 309                 pr_notice("kernel mode fan control %d\n", kernelmode);
 310
 311         *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED
 312                              : THERMAL_DEVICE_DISABLED;
 313
 314         return 0;
 315 }
 316
 317 /*
 318  * set operation mode;
 319  * enabled: the thermal layer of the kernel takes care about
 320  *          the temperature and the fan.
 321  * disabled: the BIOS takes control of the fan.
 322  */
 323 static int acerhdf_set_mode(struct thermal_zone_device *thermal,
 324                             enum thermal_device_mode mode)
 325 {
 326         if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
 327                 acerhdf_revert_to_bios_mode();
 328         else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
 329                 acerhdf_enable_kernelmode();
 330
 331         return 0;
 332 }
 333
 334 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
 335                                  enum thermal_trip_type *type)
 336 {
 337         if (trip == 0)
 338                 *type = THERMAL_TRIP_ACTIVE;
 339
 340         return 0;
 341 }
 342
 343 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
 344                                  unsigned long *temp)
 345 {
 346         if (trip == 0)
 347                 *temp = fanon;
 348
 349         return 0;
 350 }
 351
 352 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
 353                                  unsigned long *temperature)
 354 {
 355         *temperature = ACERHDF_TEMP_CRIT;
 356         return 0;
 357 }
 358
 359 /* bind callback functions to thermalzone */
 360 struct thermal_zone_device_ops acerhdf_dev_ops = {
 361         .bind = acerhdf_bind,
 362         .unbind = acerhdf_unbind,
 363         .get_temp = acerhdf_get_ec_temp,
 364         .get_mode = acerhdf_get_mode,
 365         .set_mode = acerhdf_set_mode,
 366         .get_trip_type = acerhdf_get_trip_type,
 367         .get_trip_temp = acerhdf_get_trip_temp,
 368         .get_crit_temp = acerhdf_get_crit_temp,
 369 };
 370
 371
 372 /*
 373  * cooling device callback functions
 374  * get maximal fan cooling state
 375  */
 376 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
 377                                  unsigned long *state)
 378 {
 379         *state = 1;
 380
 381         return 0;
 382 }
 383
 384 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
 385                                  unsigned long *state)
 386 {
 387         int err = 0, tmp;
 388
 389         err = acerhdf_get_fanstate(&tmp);
 390         if (err)
 391                 return err;
 392
 393         *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
 394         return 0;
 395 }
 396
 397 /* change current fan state - is overwritten when running in kernel mode */
 398 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
 399                                  unsigned long state)
 400 {
 401         int cur_temp, cur_state, err = 0;
 402
 403         if (!kernelmode)
 404                 return 0;
 405
 406         err = acerhdf_get_temp(&cur_temp);
 407         if (err) {
 408                 pr_err("error reading temperature, hand off control to BIOS\n");
 409                 goto err_out;
 410         }
 411
 412         err = acerhdf_get_fanstate(&cur_state);
 413         if (err) {
 414                 pr_err("error reading fan state, hand off control to BIOS\n");
 415                 goto err_out;
 416         }
 417
 418         if (state == 0) {
 419                 /* turn fan off only if below fanoff temperature */
 420                 if ((cur_state == ACERHDF_FAN_AUTO) &&
 421                     (cur_temp < fanoff))
 422                         acerhdf_change_fanstate(ACERHDF_FAN_OFF);
 423         } else {
 424                 if (cur_state == ACERHDF_FAN_OFF)
 425                         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 426         }
 427         return 0;
 428
 429 err_out:
 430         acerhdf_revert_to_bios_mode();
 431         return -EINVAL;
 432 }
 433
 434 /* bind fan callbacks to fan device */
 435 struct thermal_cooling_device_ops acerhdf_cooling_ops = {
 436         .get_max_state = acerhdf_get_max_state,
 437         .get_cur_state = acerhdf_get_cur_state,
 438         .set_cur_state = acerhdf_set_cur_state,
 439 };
 440
 441 /* suspend / resume functionality */
 442 static int acerhdf_suspend(struct device *dev)
 443 {
 444         if (kernelmode)
 445                 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 446
 447         if (verbose)
 448                 pr_notice("going suspend\n");
 449
 450         return 0;
 451 }
 452
 453 static int __devinit acerhdf_probe(struct platform_device *device)
 454 {
 455         return 0;
 456 }
 457
 458 static int acerhdf_remove(struct platform_device *device)
 459 {
 460         return 0;
 461 }
 462
 463 static const struct dev_pm_ops acerhdf_pm_ops = {
 464         .suspend = acerhdf_suspend,
 465         .freeze  = acerhdf_suspend,
 466 };
 467
 468 static struct platform_driver acerhdf_driver = {
 469         .driver = {
 470                 .name  = "acerhdf",
 471                 .owner = THIS_MODULE,
 472                 .pm    = &acerhdf_pm_ops,
 473         },
 474         .probe = acerhdf_probe,
 475         .remove = acerhdf_remove,
 476 };
 477
 478
 479 /* check hardware */
 480 static int acerhdf_check_hardware(void)
 481 {
 482         char const *vendor, *version, *product;
 483         int i;
 484         unsigned long prod_len = 0;
 485
 486         /* get BIOS data */
 487         vendor  = dmi_get_system_info(DMI_SYS_VENDOR);
 488         version = dmi_get_system_info(DMI_BIOS_VERSION);
 489         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 490
 491
 492         pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
 493
 494         if (force_bios[0]) {
 495                 version = force_bios;
 496                 pr_info("forcing BIOS version: %s\n", version);
 497                 kernelmode = 0;
 498         }
 499
 500         if (force_product[0]) {
 501                 product = force_product;
 502                 pr_info("forcing BIOS product: %s\n", product);
 503                 kernelmode = 0;
 504         }
 505
 506         prod_len = strlen(product);
 507
 508         if (verbose)
 509                 pr_info("BIOS info: %s %s, product: %s\n",
 510                         vendor, version, product);
 511
 512         /* search BIOS version and vendor in BIOS settings table */
 513         for (i = 0; bios_tbl[i].version[0]; i++) {
 514                 if (strlen(bios_tbl[i].product) >= prod_len &&
 515                     !strncmp(bios_tbl[i].product, product,
 516                            strlen(bios_tbl[i].product)) &&
 517                     !strcmp(bios_tbl[i].vendor, vendor) &&
 518                     !strcmp(bios_tbl[i].version, version)) {
 519                         bios_cfg = &bios_tbl[i];
 520                         break;
 521                 }
 522         }
 523
 524         if (!bios_cfg) {
 525                 pr_err("unknown (unsupported) BIOS version %s/%s/%s, "
 526                         "please report, aborting!\n", vendor, product, version);
 527                 return -EINVAL;
 528         }
 529
 530         /*
 531          * if started with kernel mode off, prevent the kernel from switching
 532          * off the fan
 533          */
 534         if (!kernelmode) {
 535                 pr_notice("Fan control off, to enable do:\n");
 536                 pr_notice("echo -n \"enabled\" > "
 537                         "/sys/class/thermal/thermal_zone0/mode\n");
 538         }
 539
 540         return 0;
 541 }
 542
 543 static int acerhdf_register_platform(void)
 544 {
 545         int err = 0;
 546
 547         err = platform_driver_register(&acerhdf_driver);
 548         if (err)
 549                 return err;
 550
 551         acerhdf_dev = platform_device_alloc("acerhdf", -1);
 552         platform_device_add(acerhdf_dev);
 553
 554         return 0;
 555 }
 556
 557 static void acerhdf_unregister_platform(void)
 558 {
 559         if (!acerhdf_dev)
 560                 return;
 561
 562         platform_device_del(acerhdf_dev);
 563         platform_driver_unregister(&acerhdf_driver);
 564 }
 565
 566 static int acerhdf_register_thermal(void)
 567 {
 568         cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
 569                                                  &acerhdf_cooling_ops);
 570
 571         if (IS_ERR(cl_dev))
 572                 return -EINVAL;
 573
 574         thz_dev = thermal_zone_device_register("acerhdf", 1, NULL,
 575                                               &acerhdf_dev_ops, 0, 0, 0,
 576                                               (kernelmode) ? interval*1000 : 0);
 577         if (IS_ERR(thz_dev))
 578                 return -EINVAL;
 579
 580         return 0;
 581 }
 582
 583 static void acerhdf_unregister_thermal(void)
 584 {
 585         if (cl_dev) {
 586                 thermal_cooling_device_unregister(cl_dev);
 587                 cl_dev = NULL;
 588         }
 589
 590         if (thz_dev) {
 591                 thermal_zone_device_unregister(thz_dev);
 592                 thz_dev = NULL;
 593         }
 594 }
 595
 596 static int __init acerhdf_init(void)
 597 {
 598         int err = 0;
 599
 600         err = acerhdf_check_hardware();
 601         if (err)
 602                 goto out_err;
 603
 604         err = acerhdf_register_platform();
 605         if (err)
 606                 goto err_unreg;
 607
 608         err = acerhdf_register_thermal();
 609         if (err)
 610                 goto err_unreg;
 611
 612         return 0;
 613
 614 err_unreg:
 615         acerhdf_unregister_thermal();
 616         acerhdf_unregister_platform();
 617
 618 out_err:
 619         return -ENODEV;
 620 }
 621
 622 static void __exit acerhdf_exit(void)
 623 {
 624         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 625         acerhdf_unregister_thermal();
 626         acerhdf_unregister_platform();
 627 }
 628
 629 MODULE_LICENSE("GPL");
 630 MODULE_AUTHOR("Peter Feuerer");
 631 MODULE_DESCRIPTION("Aspire One temperature and fan driver");
 632 MODULE_ALIAS("dmi:*:*Acer*:*:");
 633 MODULE_ALIAS("dmi:*:*Gateway*:*:");
 634 MODULE_ALIAS("dmi:*:*Packard Bell*:*:");
 635
 636 module_init(acerhdf_init);
 637 module_exit(acerhdf_exit);