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/dmi.h> 39 #include <linux/acpi.h> 40 #include <linux/thermal.h> 41 #include <linux/platform_device.h> 42 43 /* 44 * The driver is started with "kernel mode off" by default. That means, the BIOS 45 * is still in control of the fan. In this mode the driver allows to read the 46 * temperature of the cpu and a userspace tool may take over control of the fan. 47 * If the driver is switched to "kernel mode" (e.g. via module parameter) the 48 * driver is in full control of the fan. If you want the module to be started in 49 * kernel mode by default, define the following: 50 */ 51 #undef START_IN_KERNEL_MODE 52 53 #define DRV_VER "0.5.24" 54 55 /* 56 * According to the Atom N270 datasheet, 57 * (http://download.intel.com/design/processor/datashts/320032.pdf) the 58 * CPU's optimal operating limits denoted in junction temperature as 59 * measured by the on-die thermal monitor are within 0 <= Tj <= 90. So, 60 * assume 89°C is critical temperature. 61 */ 62 #define ACERHDF_TEMP_CRIT 89000 63 #define ACERHDF_FAN_OFF 0 64 #define ACERHDF_FAN_AUTO 1 65 66 /* 67 * No matter what value the user puts into the fanon variable, turn on the fan 68 * at 80 degree Celsius to prevent hardware damage 69 */ 70 #define ACERHDF_MAX_FANON 80000 71 72 /* 73 * Maximum interval between two temperature checks is 15 seconds, as the die 74 * can get hot really fast under heavy load (plus we shouldn't forget about 75 * possible impact of _external_ aggressive sources such as heaters, sun etc.) 76 */ 77 #define ACERHDF_MAX_INTERVAL 15 78 79 #ifdef START_IN_KERNEL_MODE 80 static int kernelmode = 1; 81 #else 82 static int kernelmode; 83 #endif 84 85 static unsigned int interval = 10; 86 static unsigned int fanon = 63000; 87 static unsigned int fanoff = 58000; 88 static unsigned int verbose; 89 static unsigned int fanstate = ACERHDF_FAN_AUTO; 90 static char force_bios[16]; 91 static char force_product[16]; 92 static unsigned int prev_interval; 93 static struct thermal_zone_device *thz_dev; 94 static struct thermal_cooling_device *cl_dev; 95 static struct platform_device *acerhdf_dev; 96 97 module_param(kernelmode, uint, 0); 98 MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off"); 99 module_param(interval, uint, 0600); 100 MODULE_PARM_DESC(interval, "Polling interval of temperature check"); 101 module_param(fanon, uint, 0600); 102 MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature"); 103 module_param(fanoff, uint, 0600); 104 MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature"); 105 module_param(verbose, uint, 0600); 106 MODULE_PARM_DESC(verbose, "Enable verbose dmesg output"); 107 module_param_string(force_bios, force_bios, 16, 0); 108 MODULE_PARM_DESC(force_bios, "Force BIOS version and omit BIOS check"); 109 module_param_string(force_product, force_product, 16, 0); 110 MODULE_PARM_DESC(force_product, "Force BIOS product and omit BIOS check"); 111 112 /* 113 * cmd_off: to switch the fan completely off and check if the fan is off 114 * cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then 115 * the fan speed depending on the temperature 116 */ 117 struct fancmd { 118 u8 cmd_off; 119 u8 cmd_auto; 120 }; 121 122 /* BIOS settings */ 123 struct bios_settings_t { 124 const char *vendor; 125 const char *product; 126 const char *version; 127 unsigned char fanreg; 128 unsigned char tempreg; 129 struct fancmd cmd; 130 }; 131 132 /* Register addresses and values for different BIOS versions */ 133 static const struct bios_settings_t bios_tbl[] = { 134 /* AOA110 */ 135 {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00} }, 136 {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00} }, 137 {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00} }, 138 {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00} }, 139 {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00} }, 140 {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00} }, 141 {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00} }, 142 {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00} }, 143 {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00} }, 144 /* AOA150 */ 145 {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x1f, 0x00} }, 146 {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00} }, 147 {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00} }, 148 {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00} }, 149 {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00} }, 150 {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00} }, 151 {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00} }, 152 {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00} }, 153 /* Acer 1410 */ 154 {"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58, {0x9e, 0x00} }, 155 {"Acer", "Aspire 1410", "v0.3113", 0x55, 0x58, {0x9e, 0x00} }, 156 {"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00} }, 157 {"Acer", "Aspire 1410", "v0.3117", 0x55, 0x58, {0x9e, 0x00} }, 158 {"Acer", "Aspire 1410", "v0.3119", 0x55, 0x58, {0x9e, 0x00} }, 159 {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00} }, 160 {"Acer", "Aspire 1410", "v1.3204", 0x55, 0x58, {0x9e, 0x00} }, 161 {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00} }, 162 {"Acer", "Aspire 1410", "v1.3308", 0x55, 0x58, {0x9e, 0x00} }, 163 {"Acer", "Aspire 1410", "v1.3310", 0x55, 0x58, {0x9e, 0x00} }, 164 /* Acer 1810xx */ 165 {"Acer", "Aspire 1810TZ", "v0.3108", 0x55, 0x58, {0x9e, 0x00} }, 166 {"Acer", "Aspire 1810T", "v0.3108", 0x55, 0x58, {0x9e, 0x00} }, 167 {"Acer", "Aspire 1810TZ", "v0.3113", 0x55, 0x58, {0x9e, 0x00} }, 168 {"Acer", "Aspire 1810T", "v0.3113", 0x55, 0x58, {0x9e, 0x00} }, 169 {"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00} }, 170 {"Acer", "Aspire 1810T", "v0.3115", 0x55, 0x58, {0x9e, 0x00} }, 171 {"Acer", "Aspire 1810TZ", "v0.3117", 0x55, 0x58, {0x9e, 0x00} }, 172 {"Acer", "Aspire 1810T", "v0.3117", 0x55, 0x58, {0x9e, 0x00} }, 173 {"Acer", "Aspire 1810TZ", "v0.3119", 0x55, 0x58, {0x9e, 0x00} }, 174 {"Acer", "Aspire 1810T", "v0.3119", 0x55, 0x58, {0x9e, 0x00} }, 175 {"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x00} }, 176 {"Acer", "Aspire 1810T", "v0.3120", 0x55, 0x58, {0x9e, 0x00} }, 177 {"Acer", "Aspire 1810TZ", "v1.3204", 0x55, 0x58, {0x9e, 0x00} }, 178 {"Acer", "Aspire 1810T", "v1.3204", 0x55, 0x58, {0x9e, 0x00} }, 179 {"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x00} }, 180 {"Acer", "Aspire 1810T", "v1.3303", 0x55, 0x58, {0x9e, 0x00} }, 181 {"Acer", "Aspire 1810TZ", "v1.3308", 0x55, 0x58, {0x9e, 0x00} }, 182 {"Acer", "Aspire 1810T", "v1.3308", 0x55, 0x58, {0x9e, 0x00} }, 183 {"Acer", "Aspire 1810TZ", "v1.3310", 0x55, 0x58, {0x9e, 0x00} }, 184 {"Acer", "Aspire 1810T", "v1.3310", 0x55, 0x58, {0x9e, 0x00} }, 185 /* Acer 531 */ 186 {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00} }, 187 /* Gateway */ 188 {"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x00} }, 189 {"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x00} }, 190 {"Gateway", "LT31", "v1.3103", 0x55, 0x58, {0x9e, 0x00} }, 191 {"Gateway", "LT31", "v1.3201", 0x55, 0x58, {0x9e, 0x00} }, 192 {"Gateway", "LT31", "v1.3302", 0x55, 0x58, {0x9e, 0x00} }, 193 /* Packard Bell */ 194 {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00} }, 195 {"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} }, 196 {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00} }, 197 {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} }, 198 {"Packard Bell", "DOTMU", "v1.3303", 0x55, 0x58, {0x9e, 0x00} }, 199 {"Packard Bell", "DOTMU", "v0.3120", 0x55, 0x58, {0x9e, 0x00} }, 200 {"Packard Bell", "DOTMU", "v0.3108", 0x55, 0x58, {0x9e, 0x00} }, 201 {"Packard Bell", "DOTMU", "v0.3113", 0x55, 0x58, {0x9e, 0x00} }, 202 {"Packard Bell", "DOTMU", "v0.3115", 0x55, 0x58, {0x9e, 0x00} }, 203 {"Packard Bell", "DOTMU", "v0.3117", 0x55, 0x58, {0x9e, 0x00} }, 204 {"Packard Bell", "DOTMU", "v0.3119", 0x55, 0x58, {0x9e, 0x00} }, 205 {"Packard Bell", "DOTMU", "v1.3204", 0x55, 0x58, {0x9e, 0x00} }, 206 {"Packard Bell", "DOTMA", "v1.3201", 0x55, 0x58, {0x9e, 0x00} }, 207 {"Packard Bell", "DOTMA", "v1.3302", 0x55, 0x58, {0x9e, 0x00} }, 208 /* pewpew-terminator */ 209 {"", "", "", 0, 0, {0, 0} } 210 }; 211 212 static const struct bios_settings_t *bios_cfg __read_mostly; 213 214 static int acerhdf_get_temp(int *temp) 215 { 216 u8 read_temp; 217 218 if (ec_read(bios_cfg->tempreg, &read_temp)) 219 return -EINVAL; 220 221 *temp = read_temp * 1000; 222 223 return 0; 224 } 225 226 static int acerhdf_get_fanstate(int *state) 227 { 228 u8 fan; 229 230 if (ec_read(bios_cfg->fanreg, &fan)) 231 return -EINVAL; 232 233 if (fan != bios_cfg->cmd.cmd_off) 234 *state = ACERHDF_FAN_AUTO; 235 else 236 *state = ACERHDF_FAN_OFF; 237 238 return 0; 239 } 240 241 static void acerhdf_change_fanstate(int state) 242 { 243 unsigned char cmd; 244 245 if (verbose) 246 pr_notice("fan %s\n", (state == ACERHDF_FAN_OFF) ? 247 "OFF" : "ON"); 248 249 if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) { 250 pr_err("invalid fan state %d requested, setting to auto!\n", 251 state); 252 state = ACERHDF_FAN_AUTO; 253 } 254 255 cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off 256 : bios_cfg->cmd.cmd_auto; 257 fanstate = state; 258 259 ec_write(bios_cfg->fanreg, cmd); 260 } 261 262 static void acerhdf_check_param(struct thermal_zone_device *thermal) 263 { 264 if (fanon > ACERHDF_MAX_FANON) { 265 pr_err("fanon temperature too high, set to %d\n", 266 ACERHDF_MAX_FANON); 267 fanon = ACERHDF_MAX_FANON; 268 } 269 270 if (kernelmode && prev_interval != interval) { 271 if (interval > ACERHDF_MAX_INTERVAL) { 272 pr_err("interval too high, set to %d\n", 273 ACERHDF_MAX_INTERVAL); 274 interval = ACERHDF_MAX_INTERVAL; 275 } 276 if (verbose) 277 pr_notice("interval changed to: %d\n", 278 interval); 279 thermal->polling_delay = interval*1000; 280 prev_interval = interval; 281 } 282 } 283 284 /* 285 * This is the thermal zone callback which does the delayed polling of the fan 286 * state. We do check /sysfs-originating settings here in acerhdf_check_param() 287 * as late as the polling interval is since we can't do that in the respective 288 * accessors of the module parameters. 289 */ 290 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, 291 unsigned long *t) 292 { 293 int temp, err = 0; 294 295 acerhdf_check_param(thermal); 296 297 err = acerhdf_get_temp(&temp); 298 if (err) 299 return err; 300 301 if (verbose) 302 pr_notice("temp %d\n", temp); 303 304 *t = temp; 305 return 0; 306 } 307 308 static int acerhdf_bind(struct thermal_zone_device *thermal, 309 struct thermal_cooling_device *cdev) 310 { 311 /* if the cooling device is the one from acerhdf bind it */ 312 if (cdev != cl_dev) 313 return 0; 314 315 if (thermal_zone_bind_cooling_device(thermal, 0, cdev)) { 316 pr_err("error binding cooling dev\n"); 317 return -EINVAL; 318 } 319 return 0; 320 } 321 322 static int acerhdf_unbind(struct thermal_zone_device *thermal, 323 struct thermal_cooling_device *cdev) 324 { 325 if (cdev != cl_dev) 326 return 0; 327 328 if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) { 329 pr_err("error unbinding cooling dev\n"); 330 return -EINVAL; 331 } 332 return 0; 333 } 334 335 static inline void acerhdf_revert_to_bios_mode(void) 336 { 337 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 338 kernelmode = 0; 339 if (thz_dev) 340 thz_dev->polling_delay = 0; 341 pr_notice("kernel mode fan control OFF\n"); 342 } 343 static inline void acerhdf_enable_kernelmode(void) 344 { 345 kernelmode = 1; 346 347 thz_dev->polling_delay = interval*1000; 348 thermal_zone_device_update(thz_dev); 349 pr_notice("kernel mode fan control ON\n"); 350 } 351 352 static int acerhdf_get_mode(struct thermal_zone_device *thermal, 353 enum thermal_device_mode *mode) 354 { 355 if (verbose) 356 pr_notice("kernel mode fan control %d\n", kernelmode); 357 358 *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED 359 : THERMAL_DEVICE_DISABLED; 360 361 return 0; 362 } 363 364 /* 365 * set operation mode; 366 * enabled: the thermal layer of the kernel takes care about 367 * the temperature and the fan. 368 * disabled: the BIOS takes control of the fan. 369 */ 370 static int acerhdf_set_mode(struct thermal_zone_device *thermal, 371 enum thermal_device_mode mode) 372 { 373 if (mode == THERMAL_DEVICE_DISABLED && kernelmode) 374 acerhdf_revert_to_bios_mode(); 375 else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode) 376 acerhdf_enable_kernelmode(); 377 378 return 0; 379 } 380 381 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip, 382 enum thermal_trip_type *type) 383 { 384 if (trip == 0) 385 *type = THERMAL_TRIP_ACTIVE; 386 387 return 0; 388 } 389 390 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip, 391 unsigned long *temp) 392 { 393 if (trip == 0) 394 *temp = fanon; 395 396 return 0; 397 } 398 399 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal, 400 unsigned long *temperature) 401 { 402 *temperature = ACERHDF_TEMP_CRIT; 403 return 0; 404 } 405 406 /* bind callback functions to thermalzone */ 407 static struct thermal_zone_device_ops acerhdf_dev_ops = { 408 .bind = acerhdf_bind, 409 .unbind = acerhdf_unbind, 410 .get_temp = acerhdf_get_ec_temp, 411 .get_mode = acerhdf_get_mode, 412 .set_mode = acerhdf_set_mode, 413 .get_trip_type = acerhdf_get_trip_type, 414 .get_trip_temp = acerhdf_get_trip_temp, 415 .get_crit_temp = acerhdf_get_crit_temp, 416 }; 417 418 419 /* 420 * cooling device callback functions 421 * get maximal fan cooling state 422 */ 423 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev, 424 unsigned long *state) 425 { 426 *state = 1; 427 428 return 0; 429 } 430 431 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev, 432 unsigned long *state) 433 { 434 int err = 0, tmp; 435 436 err = acerhdf_get_fanstate(&tmp); 437 if (err) 438 return err; 439 440 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0; 441 return 0; 442 } 443 444 /* change current fan state - is overwritten when running in kernel mode */ 445 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev, 446 unsigned long state) 447 { 448 int cur_temp, cur_state, err = 0; 449 450 if (!kernelmode) 451 return 0; 452 453 err = acerhdf_get_temp(&cur_temp); 454 if (err) { 455 pr_err("error reading temperature, hand off control to BIOS\n"); 456 goto err_out; 457 } 458 459 err = acerhdf_get_fanstate(&cur_state); 460 if (err) { 461 pr_err("error reading fan state, hand off control to BIOS\n"); 462 goto err_out; 463 } 464 465 if (state == 0) { 466 /* turn fan off only if below fanoff temperature */ 467 if ((cur_state == ACERHDF_FAN_AUTO) && 468 (cur_temp < fanoff)) 469 acerhdf_change_fanstate(ACERHDF_FAN_OFF); 470 } else { 471 if (cur_state == ACERHDF_FAN_OFF) 472 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 473 } 474 return 0; 475 476 err_out: 477 acerhdf_revert_to_bios_mode(); 478 return -EINVAL; 479 } 480 481 /* bind fan callbacks to fan device */ 482 static struct thermal_cooling_device_ops acerhdf_cooling_ops = { 483 .get_max_state = acerhdf_get_max_state, 484 .get_cur_state = acerhdf_get_cur_state, 485 .set_cur_state = acerhdf_set_cur_state, 486 }; 487 488 /* suspend / resume functionality */ 489 static int acerhdf_suspend(struct device *dev) 490 { 491 if (kernelmode) 492 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 493 494 if (verbose) 495 pr_notice("going suspend\n"); 496 497 return 0; 498 } 499 500 static int __devinit acerhdf_probe(struct platform_device *device) 501 { 502 return 0; 503 } 504 505 static int acerhdf_remove(struct platform_device *device) 506 { 507 return 0; 508 } 509 510 static const struct dev_pm_ops acerhdf_pm_ops = { 511 .suspend = acerhdf_suspend, 512 .freeze = acerhdf_suspend, 513 }; 514 515 static struct platform_driver acerhdf_driver = { 516 .driver = { 517 .name = "acerhdf", 518 .owner = THIS_MODULE, 519 .pm = &acerhdf_pm_ops, 520 }, 521 .probe = acerhdf_probe, 522 .remove = acerhdf_remove, 523 }; 524 525 /* checks if str begins with start */ 526 static int str_starts_with(const char *str, const char *start) 527 { 528 unsigned long str_len = 0, start_len = 0; 529 530 str_len = strlen(str); 531 start_len = strlen(start); 532 533 if (str_len >= start_len && 534 !strncmp(str, start, start_len)) 535 return 1; 536 537 return 0; 538 } 539 540 /* check hardware */ 541 static int acerhdf_check_hardware(void) 542 { 543 char const *vendor, *version, *product; 544 const struct bios_settings_t *bt = NULL; 545 546 /* get BIOS data */ 547 vendor = dmi_get_system_info(DMI_SYS_VENDOR); 548 version = dmi_get_system_info(DMI_BIOS_VERSION); 549 product = dmi_get_system_info(DMI_PRODUCT_NAME); 550 551 if (!vendor || !version || !product) { 552 pr_err("error getting hardware information\n"); 553 return -EINVAL; 554 } 555 556 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER); 557 558 if (force_bios[0]) { 559 version = force_bios; 560 pr_info("forcing BIOS version: %s\n", version); 561 kernelmode = 0; 562 } 563 564 if (force_product[0]) { 565 product = force_product; 566 pr_info("forcing BIOS product: %s\n", product); 567 kernelmode = 0; 568 } 569 570 if (verbose) 571 pr_info("BIOS info: %s %s, product: %s\n", 572 vendor, version, product); 573 574 /* search BIOS version and vendor in BIOS settings table */ 575 for (bt = bios_tbl; bt->vendor[0]; bt++) { 576 /* 577 * check if actual hardware BIOS vendor, product and version 578 * IDs start with the strings of BIOS table entry 579 */ 580 if (str_starts_with(vendor, bt->vendor) && 581 str_starts_with(product, bt->product) && 582 str_starts_with(version, bt->version)) { 583 bios_cfg = bt; 584 break; 585 } 586 } 587 588 if (!bios_cfg) { 589 pr_err("unknown (unsupported) BIOS version %s/%s/%s, " 590 "please report, aborting!\n", vendor, product, version); 591 return -EINVAL; 592 } 593 594 /* 595 * if started with kernel mode off, prevent the kernel from switching 596 * off the fan 597 */ 598 if (!kernelmode) { 599 pr_notice("Fan control off, to enable do:\n"); 600 pr_notice("echo -n \"enabled\" > " 601 "/sys/class/thermal/thermal_zone0/mode\n"); 602 } 603 604 return 0; 605 } 606 607 static int acerhdf_register_platform(void) 608 { 609 int err = 0; 610 611 err = platform_driver_register(&acerhdf_driver); 612 if (err) 613 return err; 614 615 acerhdf_dev = platform_device_alloc("acerhdf", -1); 616 if (!acerhdf_dev) { 617 err = -ENOMEM; 618 goto err_device_alloc; 619 } 620 err = platform_device_add(acerhdf_dev); 621 if (err) 622 goto err_device_add; 623 624 return 0; 625 626 err_device_add: 627 platform_device_put(acerhdf_dev); 628 err_device_alloc: 629 platform_driver_unregister(&acerhdf_driver); 630 return err; 631 } 632 633 static void acerhdf_unregister_platform(void) 634 { 635 platform_device_unregister(acerhdf_dev); 636 platform_driver_unregister(&acerhdf_driver); 637 } 638 639 static int acerhdf_register_thermal(void) 640 { 641 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL, 642 &acerhdf_cooling_ops); 643 644 if (IS_ERR(cl_dev)) 645 return -EINVAL; 646 647 thz_dev = thermal_zone_device_register("acerhdf", 1, NULL, 648 &acerhdf_dev_ops, 0, 0, 0, 649 (kernelmode) ? interval*1000 : 0); 650 if (IS_ERR(thz_dev)) 651 return -EINVAL; 652 653 return 0; 654 } 655 656 static void acerhdf_unregister_thermal(void) 657 { 658 if (cl_dev) { 659 thermal_cooling_device_unregister(cl_dev); 660 cl_dev = NULL; 661 } 662 663 if (thz_dev) { 664 thermal_zone_device_unregister(thz_dev); 665 thz_dev = NULL; 666 } 667 } 668 669 static int __init acerhdf_init(void) 670 { 671 int err = 0; 672 673 err = acerhdf_check_hardware(); 674 if (err) 675 goto out_err; 676 677 err = acerhdf_register_platform(); 678 if (err) 679 goto out_err; 680 681 err = acerhdf_register_thermal(); 682 if (err) 683 goto err_unreg; 684 685 return 0; 686 687 err_unreg: 688 acerhdf_unregister_thermal(); 689 acerhdf_unregister_platform(); 690 691 out_err: 692 return err; 693 } 694 695 static void __exit acerhdf_exit(void) 696 { 697 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 698 acerhdf_unregister_thermal(); 699 acerhdf_unregister_platform(); 700 } 701 702 MODULE_LICENSE("GPL"); 703 MODULE_AUTHOR("Peter Feuerer"); 704 MODULE_DESCRIPTION("Aspire One temperature and fan driver"); 705 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:"); 706 MODULE_ALIAS("dmi:*:*Acer*:pnAspire 1410*:"); 707 MODULE_ALIAS("dmi:*:*Acer*:pnAspire 1810*:"); 708 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:"); 709 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:"); 710 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:"); 711 MODULE_ALIAS("dmi:*:*Packard Bell*:pnAOA*:"); 712 MODULE_ALIAS("dmi:*:*Packard Bell*:pnDOA*:"); 713 MODULE_ALIAS("dmi:*:*Packard Bell*:pnDOTMU*:"); 714 MODULE_ALIAS("dmi:*:*Packard Bell*:pnDOTMA*:"); 715 716 module_init(acerhdf_init); 717 module_exit(acerhdf_exit); 718