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", "Aspire 1810TZ", "v1.3314", 0x55, 0x58, {0x9e, 0x00} }, 186 /* Acer 531 */ 187 {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00} }, 188 /* Gateway */ 189 {"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x00} }, 190 {"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x00} }, 191 {"Gateway", "LT31", "v1.3103", 0x55, 0x58, {0x9e, 0x00} }, 192 {"Gateway", "LT31", "v1.3201", 0x55, 0x58, {0x9e, 0x00} }, 193 {"Gateway", "LT31", "v1.3302", 0x55, 0x58, {0x9e, 0x00} }, 194 /* Packard Bell */ 195 {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00} }, 196 {"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} }, 197 {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00} }, 198 {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} }, 199 {"Packard Bell", "DOTMU", "v1.3303", 0x55, 0x58, {0x9e, 0x00} }, 200 {"Packard Bell", "DOTMU", "v0.3120", 0x55, 0x58, {0x9e, 0x00} }, 201 {"Packard Bell", "DOTMU", "v0.3108", 0x55, 0x58, {0x9e, 0x00} }, 202 {"Packard Bell", "DOTMU", "v0.3113", 0x55, 0x58, {0x9e, 0x00} }, 203 {"Packard Bell", "DOTMU", "v0.3115", 0x55, 0x58, {0x9e, 0x00} }, 204 {"Packard Bell", "DOTMU", "v0.3117", 0x55, 0x58, {0x9e, 0x00} }, 205 {"Packard Bell", "DOTMU", "v0.3119", 0x55, 0x58, {0x9e, 0x00} }, 206 {"Packard Bell", "DOTMU", "v1.3204", 0x55, 0x58, {0x9e, 0x00} }, 207 {"Packard Bell", "DOTMA", "v1.3201", 0x55, 0x58, {0x9e, 0x00} }, 208 {"Packard Bell", "DOTMA", "v1.3302", 0x55, 0x58, {0x9e, 0x00} }, 209 /* pewpew-terminator */ 210 {"", "", "", 0, 0, {0, 0} } 211 }; 212 213 static const struct bios_settings_t *bios_cfg __read_mostly; 214 215 static int acerhdf_get_temp(int *temp) 216 { 217 u8 read_temp; 218 219 if (ec_read(bios_cfg->tempreg, &read_temp)) 220 return -EINVAL; 221 222 *temp = read_temp * 1000; 223 224 return 0; 225 } 226 227 static int acerhdf_get_fanstate(int *state) 228 { 229 u8 fan; 230 231 if (ec_read(bios_cfg->fanreg, &fan)) 232 return -EINVAL; 233 234 if (fan != bios_cfg->cmd.cmd_off) 235 *state = ACERHDF_FAN_AUTO; 236 else 237 *state = ACERHDF_FAN_OFF; 238 239 return 0; 240 } 241 242 static void acerhdf_change_fanstate(int state) 243 { 244 unsigned char cmd; 245 246 if (verbose) 247 pr_notice("fan %s\n", (state == ACERHDF_FAN_OFF) ? 248 "OFF" : "ON"); 249 250 if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) { 251 pr_err("invalid fan state %d requested, setting to auto!\n", 252 state); 253 state = ACERHDF_FAN_AUTO; 254 } 255 256 cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off 257 : bios_cfg->cmd.cmd_auto; 258 fanstate = state; 259 260 ec_write(bios_cfg->fanreg, cmd); 261 } 262 263 static void acerhdf_check_param(struct thermal_zone_device *thermal) 264 { 265 if (fanon > ACERHDF_MAX_FANON) { 266 pr_err("fanon temperature too high, set to %d\n", 267 ACERHDF_MAX_FANON); 268 fanon = ACERHDF_MAX_FANON; 269 } 270 271 if (kernelmode && prev_interval != interval) { 272 if (interval > ACERHDF_MAX_INTERVAL) { 273 pr_err("interval too high, set to %d\n", 274 ACERHDF_MAX_INTERVAL); 275 interval = ACERHDF_MAX_INTERVAL; 276 } 277 if (verbose) 278 pr_notice("interval changed to: %d\n", 279 interval); 280 thermal->polling_delay = interval*1000; 281 prev_interval = interval; 282 } 283 } 284 285 /* 286 * This is the thermal zone callback which does the delayed polling of the fan 287 * state. We do check /sysfs-originating settings here in acerhdf_check_param() 288 * as late as the polling interval is since we can't do that in the respective 289 * accessors of the module parameters. 290 */ 291 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, 292 unsigned long *t) 293 { 294 int temp, err = 0; 295 296 acerhdf_check_param(thermal); 297 298 err = acerhdf_get_temp(&temp); 299 if (err) 300 return err; 301 302 if (verbose) 303 pr_notice("temp %d\n", temp); 304 305 *t = temp; 306 return 0; 307 } 308 309 static int acerhdf_bind(struct thermal_zone_device *thermal, 310 struct thermal_cooling_device *cdev) 311 { 312 /* if the cooling device is the one from acerhdf bind it */ 313 if (cdev != cl_dev) 314 return 0; 315 316 if (thermal_zone_bind_cooling_device(thermal, 0, cdev)) { 317 pr_err("error binding cooling dev\n"); 318 return -EINVAL; 319 } 320 return 0; 321 } 322 323 static int acerhdf_unbind(struct thermal_zone_device *thermal, 324 struct thermal_cooling_device *cdev) 325 { 326 if (cdev != cl_dev) 327 return 0; 328 329 if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) { 330 pr_err("error unbinding cooling dev\n"); 331 return -EINVAL; 332 } 333 return 0; 334 } 335 336 static inline void acerhdf_revert_to_bios_mode(void) 337 { 338 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 339 kernelmode = 0; 340 if (thz_dev) 341 thz_dev->polling_delay = 0; 342 pr_notice("kernel mode fan control OFF\n"); 343 } 344 static inline void acerhdf_enable_kernelmode(void) 345 { 346 kernelmode = 1; 347 348 thz_dev->polling_delay = interval*1000; 349 thermal_zone_device_update(thz_dev); 350 pr_notice("kernel mode fan control ON\n"); 351 } 352 353 static int acerhdf_get_mode(struct thermal_zone_device *thermal, 354 enum thermal_device_mode *mode) 355 { 356 if (verbose) 357 pr_notice("kernel mode fan control %d\n", kernelmode); 358 359 *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED 360 : THERMAL_DEVICE_DISABLED; 361 362 return 0; 363 } 364 365 /* 366 * set operation mode; 367 * enabled: the thermal layer of the kernel takes care about 368 * the temperature and the fan. 369 * disabled: the BIOS takes control of the fan. 370 */ 371 static int acerhdf_set_mode(struct thermal_zone_device *thermal, 372 enum thermal_device_mode mode) 373 { 374 if (mode == THERMAL_DEVICE_DISABLED && kernelmode) 375 acerhdf_revert_to_bios_mode(); 376 else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode) 377 acerhdf_enable_kernelmode(); 378 379 return 0; 380 } 381 382 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip, 383 enum thermal_trip_type *type) 384 { 385 if (trip == 0) 386 *type = THERMAL_TRIP_ACTIVE; 387 388 return 0; 389 } 390 391 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip, 392 unsigned long *temp) 393 { 394 if (trip == 0) 395 *temp = fanon; 396 397 return 0; 398 } 399 400 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal, 401 unsigned long *temperature) 402 { 403 *temperature = ACERHDF_TEMP_CRIT; 404 return 0; 405 } 406 407 /* bind callback functions to thermalzone */ 408 static struct thermal_zone_device_ops acerhdf_dev_ops = { 409 .bind = acerhdf_bind, 410 .unbind = acerhdf_unbind, 411 .get_temp = acerhdf_get_ec_temp, 412 .get_mode = acerhdf_get_mode, 413 .set_mode = acerhdf_set_mode, 414 .get_trip_type = acerhdf_get_trip_type, 415 .get_trip_temp = acerhdf_get_trip_temp, 416 .get_crit_temp = acerhdf_get_crit_temp, 417 }; 418 419 420 /* 421 * cooling device callback functions 422 * get maximal fan cooling state 423 */ 424 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev, 425 unsigned long *state) 426 { 427 *state = 1; 428 429 return 0; 430 } 431 432 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev, 433 unsigned long *state) 434 { 435 int err = 0, tmp; 436 437 err = acerhdf_get_fanstate(&tmp); 438 if (err) 439 return err; 440 441 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0; 442 return 0; 443 } 444 445 /* change current fan state - is overwritten when running in kernel mode */ 446 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev, 447 unsigned long state) 448 { 449 int cur_temp, cur_state, err = 0; 450 451 if (!kernelmode) 452 return 0; 453 454 err = acerhdf_get_temp(&cur_temp); 455 if (err) { 456 pr_err("error reading temperature, hand off control to BIOS\n"); 457 goto err_out; 458 } 459 460 err = acerhdf_get_fanstate(&cur_state); 461 if (err) { 462 pr_err("error reading fan state, hand off control to BIOS\n"); 463 goto err_out; 464 } 465 466 if (state == 0) { 467 /* turn fan off only if below fanoff temperature */ 468 if ((cur_state == ACERHDF_FAN_AUTO) && 469 (cur_temp < fanoff)) 470 acerhdf_change_fanstate(ACERHDF_FAN_OFF); 471 } else { 472 if (cur_state == ACERHDF_FAN_OFF) 473 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 474 } 475 return 0; 476 477 err_out: 478 acerhdf_revert_to_bios_mode(); 479 return -EINVAL; 480 } 481 482 /* bind fan callbacks to fan device */ 483 static struct thermal_cooling_device_ops acerhdf_cooling_ops = { 484 .get_max_state = acerhdf_get_max_state, 485 .get_cur_state = acerhdf_get_cur_state, 486 .set_cur_state = acerhdf_set_cur_state, 487 }; 488 489 /* suspend / resume functionality */ 490 static int acerhdf_suspend(struct device *dev) 491 { 492 if (kernelmode) 493 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 494 495 if (verbose) 496 pr_notice("going suspend\n"); 497 498 return 0; 499 } 500 501 static int __devinit acerhdf_probe(struct platform_device *device) 502 { 503 return 0; 504 } 505 506 static int acerhdf_remove(struct platform_device *device) 507 { 508 return 0; 509 } 510 511 static const struct dev_pm_ops acerhdf_pm_ops = { 512 .suspend = acerhdf_suspend, 513 .freeze = acerhdf_suspend, 514 }; 515 516 static struct platform_driver acerhdf_driver = { 517 .driver = { 518 .name = "acerhdf", 519 .owner = THIS_MODULE, 520 .pm = &acerhdf_pm_ops, 521 }, 522 .probe = acerhdf_probe, 523 .remove = acerhdf_remove, 524 }; 525 526 /* checks if str begins with start */ 527 static int str_starts_with(const char *str, const char *start) 528 { 529 unsigned long str_len = 0, start_len = 0; 530 531 str_len = strlen(str); 532 start_len = strlen(start); 533 534 if (str_len >= start_len && 535 !strncmp(str, start, start_len)) 536 return 1; 537 538 return 0; 539 } 540 541 /* check hardware */ 542 static int acerhdf_check_hardware(void) 543 { 544 char const *vendor, *version, *product; 545 const struct bios_settings_t *bt = NULL; 546 547 /* get BIOS data */ 548 vendor = dmi_get_system_info(DMI_SYS_VENDOR); 549 version = dmi_get_system_info(DMI_BIOS_VERSION); 550 product = dmi_get_system_info(DMI_PRODUCT_NAME); 551 552 if (!vendor || !version || !product) { 553 pr_err("error getting hardware information\n"); 554 return -EINVAL; 555 } 556 557 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER); 558 559 if (force_bios[0]) { 560 version = force_bios; 561 pr_info("forcing BIOS version: %s\n", version); 562 kernelmode = 0; 563 } 564 565 if (force_product[0]) { 566 product = force_product; 567 pr_info("forcing BIOS product: %s\n", product); 568 kernelmode = 0; 569 } 570 571 if (verbose) 572 pr_info("BIOS info: %s %s, product: %s\n", 573 vendor, version, product); 574 575 /* search BIOS version and vendor in BIOS settings table */ 576 for (bt = bios_tbl; bt->vendor[0]; bt++) { 577 /* 578 * check if actual hardware BIOS vendor, product and version 579 * IDs start with the strings of BIOS table entry 580 */ 581 if (str_starts_with(vendor, bt->vendor) && 582 str_starts_with(product, bt->product) && 583 str_starts_with(version, bt->version)) { 584 bios_cfg = bt; 585 break; 586 } 587 } 588 589 if (!bios_cfg) { 590 pr_err("unknown (unsupported) BIOS version %s/%s/%s, " 591 "please report, aborting!\n", vendor, product, version); 592 return -EINVAL; 593 } 594 595 /* 596 * if started with kernel mode off, prevent the kernel from switching 597 * off the fan 598 */ 599 if (!kernelmode) { 600 pr_notice("Fan control off, to enable do:\n"); 601 pr_notice("echo -n \"enabled\" > " 602 "/sys/class/thermal/thermal_zone0/mode\n"); 603 } 604 605 return 0; 606 } 607 608 static int acerhdf_register_platform(void) 609 { 610 int err = 0; 611 612 err = platform_driver_register(&acerhdf_driver); 613 if (err) 614 return err; 615 616 acerhdf_dev = platform_device_alloc("acerhdf", -1); 617 if (!acerhdf_dev) { 618 err = -ENOMEM; 619 goto err_device_alloc; 620 } 621 err = platform_device_add(acerhdf_dev); 622 if (err) 623 goto err_device_add; 624 625 return 0; 626 627 err_device_add: 628 platform_device_put(acerhdf_dev); 629 err_device_alloc: 630 platform_driver_unregister(&acerhdf_driver); 631 return err; 632 } 633 634 static void acerhdf_unregister_platform(void) 635 { 636 platform_device_unregister(acerhdf_dev); 637 platform_driver_unregister(&acerhdf_driver); 638 } 639 640 static int acerhdf_register_thermal(void) 641 { 642 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL, 643 &acerhdf_cooling_ops); 644 645 if (IS_ERR(cl_dev)) 646 return -EINVAL; 647 648 thz_dev = thermal_zone_device_register("acerhdf", 1, NULL, 649 &acerhdf_dev_ops, 0, 0, 0, 650 (kernelmode) ? interval*1000 : 0); 651 if (IS_ERR(thz_dev)) 652 return -EINVAL; 653 654 return 0; 655 } 656 657 static void acerhdf_unregister_thermal(void) 658 { 659 if (cl_dev) { 660 thermal_cooling_device_unregister(cl_dev); 661 cl_dev = NULL; 662 } 663 664 if (thz_dev) { 665 thermal_zone_device_unregister(thz_dev); 666 thz_dev = NULL; 667 } 668 } 669 670 static int __init acerhdf_init(void) 671 { 672 int err = 0; 673 674 err = acerhdf_check_hardware(); 675 if (err) 676 goto out_err; 677 678 err = acerhdf_register_platform(); 679 if (err) 680 goto out_err; 681 682 err = acerhdf_register_thermal(); 683 if (err) 684 goto err_unreg; 685 686 return 0; 687 688 err_unreg: 689 acerhdf_unregister_thermal(); 690 acerhdf_unregister_platform(); 691 692 out_err: 693 return err; 694 } 695 696 static void __exit acerhdf_exit(void) 697 { 698 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 699 acerhdf_unregister_thermal(); 700 acerhdf_unregister_platform(); 701 } 702 703 MODULE_LICENSE("GPL"); 704 MODULE_AUTHOR("Peter Feuerer"); 705 MODULE_DESCRIPTION("Aspire One temperature and fan driver"); 706 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:"); 707 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:"); 708 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:"); 709 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:"); 710 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:"); 711 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:"); 712 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:"); 713 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:"); 714 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:"); 715 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:"); 716 717 module_init(acerhdf_init); 718 module_exit(acerhdf_exit); 719