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 bp (a) alien8.de 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 "0.5.26" 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 = 60000; 87 static unsigned int fanoff = 53000; 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 /* LT1005u */ 154 {"Acer", "LT-10Q", "v0.3310", 0x55, 0x58, {0x20, 0x00} }, 155 /* Acer 1410 */ 156 {"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58, {0x9e, 0x00} }, 157 {"Acer", "Aspire 1410", "v0.3113", 0x55, 0x58, {0x9e, 0x00} }, 158 {"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00} }, 159 {"Acer", "Aspire 1410", "v0.3117", 0x55, 0x58, {0x9e, 0x00} }, 160 {"Acer", "Aspire 1410", "v0.3119", 0x55, 0x58, {0x9e, 0x00} }, 161 {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00} }, 162 {"Acer", "Aspire 1410", "v1.3204", 0x55, 0x58, {0x9e, 0x00} }, 163 {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00} }, 164 {"Acer", "Aspire 1410", "v1.3308", 0x55, 0x58, {0x9e, 0x00} }, 165 {"Acer", "Aspire 1410", "v1.3310", 0x55, 0x58, {0x9e, 0x00} }, 166 {"Acer", "Aspire 1410", "v1.3314", 0x55, 0x58, {0x9e, 0x00} }, 167 /* Acer 1810xx */ 168 {"Acer", "Aspire 1810TZ", "v0.3108", 0x55, 0x58, {0x9e, 0x00} }, 169 {"Acer", "Aspire 1810T", "v0.3108", 0x55, 0x58, {0x9e, 0x00} }, 170 {"Acer", "Aspire 1810TZ", "v0.3113", 0x55, 0x58, {0x9e, 0x00} }, 171 {"Acer", "Aspire 1810T", "v0.3113", 0x55, 0x58, {0x9e, 0x00} }, 172 {"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00} }, 173 {"Acer", "Aspire 1810T", "v0.3115", 0x55, 0x58, {0x9e, 0x00} }, 174 {"Acer", "Aspire 1810TZ", "v0.3117", 0x55, 0x58, {0x9e, 0x00} }, 175 {"Acer", "Aspire 1810T", "v0.3117", 0x55, 0x58, {0x9e, 0x00} }, 176 {"Acer", "Aspire 1810TZ", "v0.3119", 0x55, 0x58, {0x9e, 0x00} }, 177 {"Acer", "Aspire 1810T", "v0.3119", 0x55, 0x58, {0x9e, 0x00} }, 178 {"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x00} }, 179 {"Acer", "Aspire 1810T", "v0.3120", 0x55, 0x58, {0x9e, 0x00} }, 180 {"Acer", "Aspire 1810TZ", "v1.3204", 0x55, 0x58, {0x9e, 0x00} }, 181 {"Acer", "Aspire 1810T", "v1.3204", 0x55, 0x58, {0x9e, 0x00} }, 182 {"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x00} }, 183 {"Acer", "Aspire 1810T", "v1.3303", 0x55, 0x58, {0x9e, 0x00} }, 184 {"Acer", "Aspire 1810TZ", "v1.3308", 0x55, 0x58, {0x9e, 0x00} }, 185 {"Acer", "Aspire 1810T", "v1.3308", 0x55, 0x58, {0x9e, 0x00} }, 186 {"Acer", "Aspire 1810TZ", "v1.3310", 0x55, 0x58, {0x9e, 0x00} }, 187 {"Acer", "Aspire 1810T", "v1.3310", 0x55, 0x58, {0x9e, 0x00} }, 188 {"Acer", "Aspire 1810TZ", "v1.3314", 0x55, 0x58, {0x9e, 0x00} }, 189 {"Acer", "Aspire 1810T", "v1.3314", 0x55, 0x58, {0x9e, 0x00} }, 190 /* Acer 531 */ 191 {"Acer", "AO531h", "v0.3104", 0x55, 0x58, {0x20, 0x00} }, 192 {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00} }, 193 {"Acer", "AO531h", "v0.3304", 0x55, 0x58, {0x20, 0x00} }, 194 /* Acer 751 */ 195 {"Acer", "AO751h", "V0.3212", 0x55, 0x58, {0x21, 0x00} }, 196 /* Acer 1825 */ 197 {"Acer", "Aspire 1825PTZ", "V1.3118", 0x55, 0x58, {0x9e, 0x00} }, 198 {"Acer", "Aspire 1825PTZ", "V1.3127", 0x55, 0x58, {0x9e, 0x00} }, 199 /* Acer TravelMate 7730 */ 200 {"Acer", "TravelMate 7730G", "v0.3509", 0x55, 0x58, {0xaf, 0x00} }, 201 /* Gateway */ 202 {"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x00} }, 203 {"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x00} }, 204 {"Gateway", "LT31", "v1.3103", 0x55, 0x58, {0x9e, 0x00} }, 205 {"Gateway", "LT31", "v1.3201", 0x55, 0x58, {0x9e, 0x00} }, 206 {"Gateway", "LT31", "v1.3302", 0x55, 0x58, {0x9e, 0x00} }, 207 {"Gateway", "LT31", "v1.3303t", 0x55, 0x58, {0x9e, 0x00} }, 208 /* Packard Bell */ 209 {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00} }, 210 {"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} }, 211 {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00} }, 212 {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} }, 213 {"Packard Bell", "ENBFT", "V1.3118", 0x55, 0x58, {0x9e, 0x00} }, 214 {"Packard Bell", "ENBFT", "V1.3127", 0x55, 0x58, {0x9e, 0x00} }, 215 {"Packard Bell", "DOTMU", "v1.3303", 0x55, 0x58, {0x9e, 0x00} }, 216 {"Packard Bell", "DOTMU", "v0.3120", 0x55, 0x58, {0x9e, 0x00} }, 217 {"Packard Bell", "DOTMU", "v0.3108", 0x55, 0x58, {0x9e, 0x00} }, 218 {"Packard Bell", "DOTMU", "v0.3113", 0x55, 0x58, {0x9e, 0x00} }, 219 {"Packard Bell", "DOTMU", "v0.3115", 0x55, 0x58, {0x9e, 0x00} }, 220 {"Packard Bell", "DOTMU", "v0.3117", 0x55, 0x58, {0x9e, 0x00} }, 221 {"Packard Bell", "DOTMU", "v0.3119", 0x55, 0x58, {0x9e, 0x00} }, 222 {"Packard Bell", "DOTMU", "v1.3204", 0x55, 0x58, {0x9e, 0x00} }, 223 {"Packard Bell", "DOTMA", "v1.3201", 0x55, 0x58, {0x9e, 0x00} }, 224 {"Packard Bell", "DOTMA", "v1.3302", 0x55, 0x58, {0x9e, 0x00} }, 225 {"Packard Bell", "DOTMA", "v1.3303t", 0x55, 0x58, {0x9e, 0x00} }, 226 {"Packard Bell", "DOTVR46", "v1.3308", 0x55, 0x58, {0x9e, 0x00} }, 227 /* pewpew-terminator */ 228 {"", "", "", 0, 0, {0, 0} } 229 }; 230 231 static const struct bios_settings_t *bios_cfg __read_mostly; 232 233 static int acerhdf_get_temp(int *temp) 234 { 235 u8 read_temp; 236 237 if (ec_read(bios_cfg->tempreg, &read_temp)) 238 return -EINVAL; 239 240 *temp = read_temp * 1000; 241 242 return 0; 243 } 244 245 static int acerhdf_get_fanstate(int *state) 246 { 247 u8 fan; 248 249 if (ec_read(bios_cfg->fanreg, &fan)) 250 return -EINVAL; 251 252 if (fan != bios_cfg->cmd.cmd_off) 253 *state = ACERHDF_FAN_AUTO; 254 else 255 *state = ACERHDF_FAN_OFF; 256 257 return 0; 258 } 259 260 static void acerhdf_change_fanstate(int state) 261 { 262 unsigned char cmd; 263 264 if (verbose) 265 pr_notice("fan %s\n", state == ACERHDF_FAN_OFF ? "OFF" : "ON"); 266 267 if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) { 268 pr_err("invalid fan state %d requested, setting to auto!\n", 269 state); 270 state = ACERHDF_FAN_AUTO; 271 } 272 273 cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off 274 : bios_cfg->cmd.cmd_auto; 275 fanstate = state; 276 277 ec_write(bios_cfg->fanreg, cmd); 278 } 279 280 static void acerhdf_check_param(struct thermal_zone_device *thermal) 281 { 282 if (fanon > ACERHDF_MAX_FANON) { 283 pr_err("fanon temperature too high, set to %d\n", 284 ACERHDF_MAX_FANON); 285 fanon = ACERHDF_MAX_FANON; 286 } 287 288 if (kernelmode && prev_interval != interval) { 289 if (interval > ACERHDF_MAX_INTERVAL) { 290 pr_err("interval too high, set to %d\n", 291 ACERHDF_MAX_INTERVAL); 292 interval = ACERHDF_MAX_INTERVAL; 293 } 294 if (verbose) 295 pr_notice("interval changed to: %d\n", interval); 296 thermal->polling_delay = interval*1000; 297 prev_interval = interval; 298 } 299 } 300 301 /* 302 * This is the thermal zone callback which does the delayed polling of the fan 303 * state. We do check /sysfs-originating settings here in acerhdf_check_param() 304 * as late as the polling interval is since we can't do that in the respective 305 * accessors of the module parameters. 306 */ 307 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, 308 unsigned long *t) 309 { 310 int temp, err = 0; 311 312 acerhdf_check_param(thermal); 313 314 err = acerhdf_get_temp(&temp); 315 if (err) 316 return err; 317 318 if (verbose) 319 pr_notice("temp %d\n", temp); 320 321 *t = temp; 322 return 0; 323 } 324 325 static int acerhdf_bind(struct thermal_zone_device *thermal, 326 struct thermal_cooling_device *cdev) 327 { 328 /* if the cooling device is the one from acerhdf bind it */ 329 if (cdev != cl_dev) 330 return 0; 331 332 if (thermal_zone_bind_cooling_device(thermal, 0, cdev, 333 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT)) { 334 pr_err("error binding cooling dev\n"); 335 return -EINVAL; 336 } 337 return 0; 338 } 339 340 static int acerhdf_unbind(struct thermal_zone_device *thermal, 341 struct thermal_cooling_device *cdev) 342 { 343 if (cdev != cl_dev) 344 return 0; 345 346 if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) { 347 pr_err("error unbinding cooling dev\n"); 348 return -EINVAL; 349 } 350 return 0; 351 } 352 353 static inline void acerhdf_revert_to_bios_mode(void) 354 { 355 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 356 kernelmode = 0; 357 if (thz_dev) 358 thz_dev->polling_delay = 0; 359 pr_notice("kernel mode fan control OFF\n"); 360 } 361 static inline void acerhdf_enable_kernelmode(void) 362 { 363 kernelmode = 1; 364 365 thz_dev->polling_delay = interval*1000; 366 thermal_zone_device_update(thz_dev); 367 pr_notice("kernel mode fan control ON\n"); 368 } 369 370 static int acerhdf_get_mode(struct thermal_zone_device *thermal, 371 enum thermal_device_mode *mode) 372 { 373 if (verbose) 374 pr_notice("kernel mode fan control %d\n", kernelmode); 375 376 *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED 377 : THERMAL_DEVICE_DISABLED; 378 379 return 0; 380 } 381 382 /* 383 * set operation mode; 384 * enabled: the thermal layer of the kernel takes care about 385 * the temperature and the fan. 386 * disabled: the BIOS takes control of the fan. 387 */ 388 static int acerhdf_set_mode(struct thermal_zone_device *thermal, 389 enum thermal_device_mode mode) 390 { 391 if (mode == THERMAL_DEVICE_DISABLED && kernelmode) 392 acerhdf_revert_to_bios_mode(); 393 else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode) 394 acerhdf_enable_kernelmode(); 395 396 return 0; 397 } 398 399 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip, 400 enum thermal_trip_type *type) 401 { 402 if (trip == 0) 403 *type = THERMAL_TRIP_ACTIVE; 404 405 return 0; 406 } 407 408 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip, 409 unsigned long *temp) 410 { 411 if (trip == 0) 412 *temp = fanon; 413 414 return 0; 415 } 416 417 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal, 418 unsigned long *temperature) 419 { 420 *temperature = ACERHDF_TEMP_CRIT; 421 return 0; 422 } 423 424 /* bind callback functions to thermalzone */ 425 static struct thermal_zone_device_ops acerhdf_dev_ops = { 426 .bind = acerhdf_bind, 427 .unbind = acerhdf_unbind, 428 .get_temp = acerhdf_get_ec_temp, 429 .get_mode = acerhdf_get_mode, 430 .set_mode = acerhdf_set_mode, 431 .get_trip_type = acerhdf_get_trip_type, 432 .get_trip_temp = acerhdf_get_trip_temp, 433 .get_crit_temp = acerhdf_get_crit_temp, 434 }; 435 436 437 /* 438 * cooling device callback functions 439 * get maximal fan cooling state 440 */ 441 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev, 442 unsigned long *state) 443 { 444 *state = 1; 445 446 return 0; 447 } 448 449 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev, 450 unsigned long *state) 451 { 452 int err = 0, tmp; 453 454 err = acerhdf_get_fanstate(&tmp); 455 if (err) 456 return err; 457 458 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0; 459 return 0; 460 } 461 462 /* change current fan state - is overwritten when running in kernel mode */ 463 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev, 464 unsigned long state) 465 { 466 int cur_temp, cur_state, err = 0; 467 468 if (!kernelmode) 469 return 0; 470 471 err = acerhdf_get_temp(&cur_temp); 472 if (err) { 473 pr_err("error reading temperature, hand off control to BIOS\n"); 474 goto err_out; 475 } 476 477 err = acerhdf_get_fanstate(&cur_state); 478 if (err) { 479 pr_err("error reading fan state, hand off control to BIOS\n"); 480 goto err_out; 481 } 482 483 if (state == 0) { 484 /* turn fan off only if below fanoff temperature */ 485 if ((cur_state == ACERHDF_FAN_AUTO) && 486 (cur_temp < fanoff)) 487 acerhdf_change_fanstate(ACERHDF_FAN_OFF); 488 } else { 489 if (cur_state == ACERHDF_FAN_OFF) 490 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 491 } 492 return 0; 493 494 err_out: 495 acerhdf_revert_to_bios_mode(); 496 return -EINVAL; 497 } 498 499 /* bind fan callbacks to fan device */ 500 static struct thermal_cooling_device_ops acerhdf_cooling_ops = { 501 .get_max_state = acerhdf_get_max_state, 502 .get_cur_state = acerhdf_get_cur_state, 503 .set_cur_state = acerhdf_set_cur_state, 504 }; 505 506 /* suspend / resume functionality */ 507 static int acerhdf_suspend(struct device *dev) 508 { 509 if (kernelmode) 510 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 511 512 if (verbose) 513 pr_notice("going suspend\n"); 514 515 return 0; 516 } 517 518 static int acerhdf_probe(struct platform_device *device) 519 { 520 return 0; 521 } 522 523 static int acerhdf_remove(struct platform_device *device) 524 { 525 return 0; 526 } 527 528 static const struct dev_pm_ops acerhdf_pm_ops = { 529 .suspend = acerhdf_suspend, 530 .freeze = acerhdf_suspend, 531 }; 532 533 static struct platform_driver acerhdf_driver = { 534 .driver = { 535 .name = "acerhdf", 536 .owner = THIS_MODULE, 537 .pm = &acerhdf_pm_ops, 538 }, 539 .probe = acerhdf_probe, 540 .remove = acerhdf_remove, 541 }; 542 543 /* checks if str begins with start */ 544 static int str_starts_with(const char *str, const char *start) 545 { 546 unsigned long str_len = 0, start_len = 0; 547 548 str_len = strlen(str); 549 start_len = strlen(start); 550 551 if (str_len >= start_len && 552 !strncmp(str, start, start_len)) 553 return 1; 554 555 return 0; 556 } 557 558 /* check hardware */ 559 static int acerhdf_check_hardware(void) 560 { 561 char const *vendor, *version, *product; 562 const struct bios_settings_t *bt = NULL; 563 564 /* get BIOS data */ 565 vendor = dmi_get_system_info(DMI_SYS_VENDOR); 566 version = dmi_get_system_info(DMI_BIOS_VERSION); 567 product = dmi_get_system_info(DMI_PRODUCT_NAME); 568 569 if (!vendor || !version || !product) { 570 pr_err("error getting hardware information\n"); 571 return -EINVAL; 572 } 573 574 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER); 575 576 if (force_bios[0]) { 577 version = force_bios; 578 pr_info("forcing BIOS version: %s\n", version); 579 kernelmode = 0; 580 } 581 582 if (force_product[0]) { 583 product = force_product; 584 pr_info("forcing BIOS product: %s\n", product); 585 kernelmode = 0; 586 } 587 588 if (verbose) 589 pr_info("BIOS info: %s %s, product: %s\n", 590 vendor, version, product); 591 592 /* search BIOS version and vendor in BIOS settings table */ 593 for (bt = bios_tbl; bt->vendor[0]; bt++) { 594 /* 595 * check if actual hardware BIOS vendor, product and version 596 * IDs start with the strings of BIOS table entry 597 */ 598 if (str_starts_with(vendor, bt->vendor) && 599 str_starts_with(product, bt->product) && 600 str_starts_with(version, bt->version)) { 601 bios_cfg = bt; 602 break; 603 } 604 } 605 606 if (!bios_cfg) { 607 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n", 608 vendor, product, version); 609 return -EINVAL; 610 } 611 612 /* 613 * if started with kernel mode off, prevent the kernel from switching 614 * off the fan 615 */ 616 if (!kernelmode) { 617 pr_notice("Fan control off, to enable do:\n"); 618 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zone0/mode\n"); 619 } 620 621 return 0; 622 } 623 624 static int acerhdf_register_platform(void) 625 { 626 int err = 0; 627 628 err = platform_driver_register(&acerhdf_driver); 629 if (err) 630 return err; 631 632 acerhdf_dev = platform_device_alloc("acerhdf", -1); 633 if (!acerhdf_dev) { 634 err = -ENOMEM; 635 goto err_device_alloc; 636 } 637 err = platform_device_add(acerhdf_dev); 638 if (err) 639 goto err_device_add; 640 641 return 0; 642 643 err_device_add: 644 platform_device_put(acerhdf_dev); 645 err_device_alloc: 646 platform_driver_unregister(&acerhdf_driver); 647 return err; 648 } 649 650 static void acerhdf_unregister_platform(void) 651 { 652 platform_device_unregister(acerhdf_dev); 653 platform_driver_unregister(&acerhdf_driver); 654 } 655 656 static int acerhdf_register_thermal(void) 657 { 658 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL, 659 &acerhdf_cooling_ops); 660 661 if (IS_ERR(cl_dev)) 662 return -EINVAL; 663 664 thz_dev = thermal_zone_device_register("acerhdf", 1, 0, NULL, 665 &acerhdf_dev_ops, NULL, 0, 666 (kernelmode) ? interval*1000 : 0); 667 if (IS_ERR(thz_dev)) 668 return -EINVAL; 669 670 return 0; 671 } 672 673 static void acerhdf_unregister_thermal(void) 674 { 675 if (cl_dev) { 676 thermal_cooling_device_unregister(cl_dev); 677 cl_dev = NULL; 678 } 679 680 if (thz_dev) { 681 thermal_zone_device_unregister(thz_dev); 682 thz_dev = NULL; 683 } 684 } 685 686 static int __init acerhdf_init(void) 687 { 688 int err = 0; 689 690 err = acerhdf_check_hardware(); 691 if (err) 692 goto out_err; 693 694 err = acerhdf_register_platform(); 695 if (err) 696 goto out_err; 697 698 err = acerhdf_register_thermal(); 699 if (err) 700 goto err_unreg; 701 702 return 0; 703 704 err_unreg: 705 acerhdf_unregister_thermal(); 706 acerhdf_unregister_platform(); 707 708 out_err: 709 return err; 710 } 711 712 static void __exit acerhdf_exit(void) 713 { 714 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 715 acerhdf_unregister_thermal(); 716 acerhdf_unregister_platform(); 717 } 718 719 MODULE_LICENSE("GPL"); 720 MODULE_AUTHOR("Peter Feuerer"); 721 MODULE_DESCRIPTION("Aspire One temperature and fan driver"); 722 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:"); 723 MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:"); 724 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:"); 725 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:"); 726 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:"); 727 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:"); 728 MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:"); 729 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:"); 730 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:"); 731 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:"); 732 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:"); 733 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:"); 734 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:"); 735 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:"); 736 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:"); 737 738 module_init(acerhdf_init); 739 module_exit(acerhdf_exit); 740