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 "0.7.0" 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 struct manualcmd { 123 u8 mreg; 124 u8 moff; 125 }; 126 127 /* default register and command to disable fan in manual mode */ 128 static const struct manualcmd mcmd = { 129 .mreg = 0x94, 130 .moff = 0xff, 131 }; 132 133 /* BIOS settings */ 134 struct bios_settings { 135 const char *vendor; 136 const char *product; 137 const char *version; 138 u8 fanreg; 139 u8 tempreg; 140 struct fancmd cmd; 141 int mcmd_enable; 142 }; 143 144 /* Register addresses and values for different BIOS versions */ 145 static const struct bios_settings bios_tbl[] = { 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 /* Packard Bell */ 237 {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00}, 0}, 238 {"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00}, 0}, 239 {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00}, 0}, 240 {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00}, 0}, 241 {"Packard Bell", "ENBFT", "V1.3118", 0x55, 0x58, {0x9e, 0x00}, 0}, 242 {"Packard Bell", "ENBFT", "V1.3127", 0x55, 0x58, {0x9e, 0x00}, 0}, 243 {"Packard Bell", "DOTMU", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0}, 244 {"Packard Bell", "DOTMU", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0}, 245 {"Packard Bell", "DOTMU", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0}, 246 {"Packard Bell", "DOTMU", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0}, 247 {"Packard Bell", "DOTMU", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0}, 248 {"Packard Bell", "DOTMU", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0}, 249 {"Packard Bell", "DOTMU", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0}, 250 {"Packard Bell", "DOTMU", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0}, 251 {"Packard Bell", "DOTMA", "v1.3201", 0x55, 0x58, {0x9e, 0x00}, 0}, 252 {"Packard Bell", "DOTMA", "v1.3302", 0x55, 0x58, {0x9e, 0x00}, 0}, 253 {"Packard Bell", "DOTMA", "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0}, 254 {"Packard Bell", "DOTVR46", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0}, 255 /* pewpew-terminator */ 256 {"", "", "", 0, 0, {0, 0}, 0} 257 }; 258 259 static const struct bios_settings *bios_cfg __read_mostly; 260 261 /* 262 * this struct is used to instruct thermal layer to use bang_bang instead of 263 * default governor for acerhdf 264 */ 265 static struct thermal_zone_params acerhdf_zone_params = { 266 .governor_name = "bang_bang", 267 }; 268 269 static int acerhdf_get_temp(int *temp) 270 { 271 u8 read_temp; 272 273 if (ec_read(bios_cfg->tempreg, &read_temp)) 274 return -EINVAL; 275 276 *temp = read_temp * 1000; 277 278 return 0; 279 } 280 281 static int acerhdf_get_fanstate(int *state) 282 { 283 u8 fan; 284 285 if (ec_read(bios_cfg->fanreg, &fan)) 286 return -EINVAL; 287 288 if (fan != bios_cfg->cmd.cmd_off) 289 *state = ACERHDF_FAN_AUTO; 290 else 291 *state = ACERHDF_FAN_OFF; 292 293 return 0; 294 } 295 296 static void acerhdf_change_fanstate(int state) 297 { 298 unsigned char cmd; 299 300 if (verbose) 301 pr_notice("fan %s\n", state == ACERHDF_FAN_OFF ? "OFF" : "ON"); 302 303 if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) { 304 pr_err("invalid fan state %d requested, setting to auto!\n", 305 state); 306 state = ACERHDF_FAN_AUTO; 307 } 308 309 cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off 310 : bios_cfg->cmd.cmd_auto; 311 fanstate = state; 312 313 ec_write(bios_cfg->fanreg, cmd); 314 315 if (bios_cfg->mcmd_enable && state == ACERHDF_FAN_OFF) { 316 if (verbose) 317 pr_notice("turning off fan manually\n"); 318 ec_write(mcmd.mreg, mcmd.moff); 319 } 320 } 321 322 static void acerhdf_check_param(struct thermal_zone_device *thermal) 323 { 324 if (fanon > ACERHDF_MAX_FANON) { 325 pr_err("fanon temperature too high, set to %d\n", 326 ACERHDF_MAX_FANON); 327 fanon = ACERHDF_MAX_FANON; 328 } 329 330 if (kernelmode && prev_interval != interval) { 331 if (interval > ACERHDF_MAX_INTERVAL) { 332 pr_err("interval too high, set to %d\n", 333 ACERHDF_MAX_INTERVAL); 334 interval = ACERHDF_MAX_INTERVAL; 335 } 336 if (verbose) 337 pr_notice("interval changed to: %d\n", interval); 338 thermal->polling_delay = interval*1000; 339 prev_interval = interval; 340 } 341 } 342 343 /* 344 * This is the thermal zone callback which does the delayed polling of the fan 345 * state. We do check /sysfs-originating settings here in acerhdf_check_param() 346 * as late as the polling interval is since we can't do that in the respective 347 * accessors of the module parameters. 348 */ 349 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, int *t) 350 { 351 int temp, err = 0; 352 353 acerhdf_check_param(thermal); 354 355 err = acerhdf_get_temp(&temp); 356 if (err) 357 return err; 358 359 if (verbose) 360 pr_notice("temp %d\n", temp); 361 362 *t = temp; 363 return 0; 364 } 365 366 static int acerhdf_bind(struct thermal_zone_device *thermal, 367 struct thermal_cooling_device *cdev) 368 { 369 /* if the cooling device is the one from acerhdf bind it */ 370 if (cdev != cl_dev) 371 return 0; 372 373 if (thermal_zone_bind_cooling_device(thermal, 0, cdev, 374 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT, 375 THERMAL_WEIGHT_DEFAULT)) { 376 pr_err("error binding cooling dev\n"); 377 return -EINVAL; 378 } 379 return 0; 380 } 381 382 static int acerhdf_unbind(struct thermal_zone_device *thermal, 383 struct thermal_cooling_device *cdev) 384 { 385 if (cdev != cl_dev) 386 return 0; 387 388 if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) { 389 pr_err("error unbinding cooling dev\n"); 390 return -EINVAL; 391 } 392 return 0; 393 } 394 395 static inline void acerhdf_revert_to_bios_mode(void) 396 { 397 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 398 kernelmode = 0; 399 if (thz_dev) 400 thz_dev->polling_delay = 0; 401 pr_notice("kernel mode fan control OFF\n"); 402 } 403 static inline void acerhdf_enable_kernelmode(void) 404 { 405 kernelmode = 1; 406 407 thz_dev->polling_delay = interval*1000; 408 thermal_zone_device_update(thz_dev, THERMAL_EVENT_UNSPECIFIED); 409 pr_notice("kernel mode fan control ON\n"); 410 } 411 412 static int acerhdf_get_mode(struct thermal_zone_device *thermal, 413 enum thermal_device_mode *mode) 414 { 415 if (verbose) 416 pr_notice("kernel mode fan control %d\n", kernelmode); 417 418 *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED 419 : THERMAL_DEVICE_DISABLED; 420 421 return 0; 422 } 423 424 /* 425 * set operation mode; 426 * enabled: the thermal layer of the kernel takes care about 427 * the temperature and the fan. 428 * disabled: the BIOS takes control of the fan. 429 */ 430 static int acerhdf_set_mode(struct thermal_zone_device *thermal, 431 enum thermal_device_mode mode) 432 { 433 if (mode == THERMAL_DEVICE_DISABLED && kernelmode) 434 acerhdf_revert_to_bios_mode(); 435 else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode) 436 acerhdf_enable_kernelmode(); 437 438 return 0; 439 } 440 441 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip, 442 enum thermal_trip_type *type) 443 { 444 if (trip == 0) 445 *type = THERMAL_TRIP_ACTIVE; 446 else if (trip == 1) 447 *type = THERMAL_TRIP_CRITICAL; 448 else 449 return -EINVAL; 450 451 return 0; 452 } 453 454 static int acerhdf_get_trip_hyst(struct thermal_zone_device *thermal, int trip, 455 int *temp) 456 { 457 if (trip != 0) 458 return -EINVAL; 459 460 *temp = fanon - fanoff; 461 462 return 0; 463 } 464 465 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip, 466 int *temp) 467 { 468 if (trip == 0) 469 *temp = fanon; 470 else if (trip == 1) 471 *temp = ACERHDF_TEMP_CRIT; 472 else 473 return -EINVAL; 474 475 return 0; 476 } 477 478 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal, 479 int *temperature) 480 { 481 *temperature = ACERHDF_TEMP_CRIT; 482 return 0; 483 } 484 485 /* bind callback functions to thermalzone */ 486 static struct thermal_zone_device_ops acerhdf_dev_ops = { 487 .bind = acerhdf_bind, 488 .unbind = acerhdf_unbind, 489 .get_temp = acerhdf_get_ec_temp, 490 .get_mode = acerhdf_get_mode, 491 .set_mode = acerhdf_set_mode, 492 .get_trip_type = acerhdf_get_trip_type, 493 .get_trip_hyst = acerhdf_get_trip_hyst, 494 .get_trip_temp = acerhdf_get_trip_temp, 495 .get_crit_temp = acerhdf_get_crit_temp, 496 }; 497 498 499 /* 500 * cooling device callback functions 501 * get maximal fan cooling state 502 */ 503 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev, 504 unsigned long *state) 505 { 506 *state = 1; 507 508 return 0; 509 } 510 511 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev, 512 unsigned long *state) 513 { 514 int err = 0, tmp; 515 516 err = acerhdf_get_fanstate(&tmp); 517 if (err) 518 return err; 519 520 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0; 521 return 0; 522 } 523 524 /* change current fan state - is overwritten when running in kernel mode */ 525 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev, 526 unsigned long state) 527 { 528 int cur_temp, cur_state, err = 0; 529 530 if (!kernelmode) 531 return 0; 532 533 err = acerhdf_get_temp(&cur_temp); 534 if (err) { 535 pr_err("error reading temperature, hand off control to BIOS\n"); 536 goto err_out; 537 } 538 539 err = acerhdf_get_fanstate(&cur_state); 540 if (err) { 541 pr_err("error reading fan state, hand off control to BIOS\n"); 542 goto err_out; 543 } 544 545 if (state == 0) { 546 if (cur_state == ACERHDF_FAN_AUTO) 547 acerhdf_change_fanstate(ACERHDF_FAN_OFF); 548 } else { 549 if (cur_state == ACERHDF_FAN_OFF) 550 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 551 } 552 return 0; 553 554 err_out: 555 acerhdf_revert_to_bios_mode(); 556 return -EINVAL; 557 } 558 559 /* bind fan callbacks to fan device */ 560 static const struct thermal_cooling_device_ops acerhdf_cooling_ops = { 561 .get_max_state = acerhdf_get_max_state, 562 .get_cur_state = acerhdf_get_cur_state, 563 .set_cur_state = acerhdf_set_cur_state, 564 }; 565 566 /* suspend / resume functionality */ 567 static int acerhdf_suspend(struct device *dev) 568 { 569 if (kernelmode) 570 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 571 572 if (verbose) 573 pr_notice("going suspend\n"); 574 575 return 0; 576 } 577 578 static int acerhdf_probe(struct platform_device *device) 579 { 580 return 0; 581 } 582 583 static int acerhdf_remove(struct platform_device *device) 584 { 585 return 0; 586 } 587 588 static const struct dev_pm_ops acerhdf_pm_ops = { 589 .suspend = acerhdf_suspend, 590 .freeze = acerhdf_suspend, 591 }; 592 593 static struct platform_driver acerhdf_driver = { 594 .driver = { 595 .name = "acerhdf", 596 .pm = &acerhdf_pm_ops, 597 }, 598 .probe = acerhdf_probe, 599 .remove = acerhdf_remove, 600 }; 601 602 /* checks if str begins with start */ 603 static int str_starts_with(const char *str, const char *start) 604 { 605 unsigned long str_len = 0, start_len = 0; 606 607 str_len = strlen(str); 608 start_len = strlen(start); 609 610 if (str_len >= start_len && 611 !strncmp(str, start, start_len)) 612 return 1; 613 614 return 0; 615 } 616 617 /* check hardware */ 618 static int acerhdf_check_hardware(void) 619 { 620 char const *vendor, *version, *product; 621 const struct bios_settings *bt = NULL; 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 (force_bios[0]) { 636 version = force_bios; 637 pr_info("forcing BIOS version: %s\n", version); 638 kernelmode = 0; 639 } 640 641 if (force_product[0]) { 642 product = force_product; 643 pr_info("forcing BIOS product: %s\n", product); 644 kernelmode = 0; 645 } 646 647 if (verbose) 648 pr_info("BIOS info: %s %s, product: %s\n", 649 vendor, version, product); 650 651 /* search BIOS version and vendor in BIOS settings table */ 652 for (bt = bios_tbl; bt->vendor[0]; bt++) { 653 /* 654 * check if actual hardware BIOS vendor, product and version 655 * IDs start with the strings of BIOS table entry 656 */ 657 if (str_starts_with(vendor, bt->vendor) && 658 str_starts_with(product, bt->product) && 659 str_starts_with(version, bt->version)) { 660 bios_cfg = bt; 661 break; 662 } 663 } 664 665 if (!bios_cfg) { 666 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n", 667 vendor, product, version); 668 return -EINVAL; 669 } 670 671 /* 672 * if started with kernel mode off, prevent the kernel from switching 673 * off the fan 674 */ 675 if (!kernelmode) { 676 pr_notice("Fan control off, to enable do:\n"); 677 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zone0/mode\n"); 678 } 679 680 return 0; 681 } 682 683 static int acerhdf_register_platform(void) 684 { 685 int err = 0; 686 687 err = platform_driver_register(&acerhdf_driver); 688 if (err) 689 return err; 690 691 acerhdf_dev = platform_device_alloc("acerhdf", -1); 692 if (!acerhdf_dev) { 693 err = -ENOMEM; 694 goto err_device_alloc; 695 } 696 err = platform_device_add(acerhdf_dev); 697 if (err) 698 goto err_device_add; 699 700 return 0; 701 702 err_device_add: 703 platform_device_put(acerhdf_dev); 704 err_device_alloc: 705 platform_driver_unregister(&acerhdf_driver); 706 return err; 707 } 708 709 static void acerhdf_unregister_platform(void) 710 { 711 platform_device_unregister(acerhdf_dev); 712 platform_driver_unregister(&acerhdf_driver); 713 } 714 715 static int acerhdf_register_thermal(void) 716 { 717 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL, 718 &acerhdf_cooling_ops); 719 720 if (IS_ERR(cl_dev)) 721 return -EINVAL; 722 723 thz_dev = thermal_zone_device_register("acerhdf", 2, 0, NULL, 724 &acerhdf_dev_ops, 725 &acerhdf_zone_params, 0, 726 (kernelmode) ? interval*1000 : 0); 727 if (IS_ERR(thz_dev)) 728 return -EINVAL; 729 730 if (strcmp(thz_dev->governor->name, 731 acerhdf_zone_params.governor_name)) { 732 pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n", 733 acerhdf_zone_params.governor_name); 734 return -EINVAL; 735 } 736 737 return 0; 738 } 739 740 static void acerhdf_unregister_thermal(void) 741 { 742 if (cl_dev) { 743 thermal_cooling_device_unregister(cl_dev); 744 cl_dev = NULL; 745 } 746 747 if (thz_dev) { 748 thermal_zone_device_unregister(thz_dev); 749 thz_dev = NULL; 750 } 751 } 752 753 static int __init acerhdf_init(void) 754 { 755 int err = 0; 756 757 err = acerhdf_check_hardware(); 758 if (err) 759 goto out_err; 760 761 err = acerhdf_register_platform(); 762 if (err) 763 goto out_err; 764 765 err = acerhdf_register_thermal(); 766 if (err) 767 goto err_unreg; 768 769 return 0; 770 771 err_unreg: 772 acerhdf_unregister_thermal(); 773 acerhdf_unregister_platform(); 774 775 out_err: 776 return err; 777 } 778 779 static void __exit acerhdf_exit(void) 780 { 781 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 782 acerhdf_unregister_thermal(); 783 acerhdf_unregister_platform(); 784 } 785 786 MODULE_LICENSE("GPL"); 787 MODULE_AUTHOR("Peter Feuerer"); 788 MODULE_DESCRIPTION("Aspire One temperature and fan driver"); 789 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:"); 790 MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:"); 791 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:"); 792 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:"); 793 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5755G:"); 794 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:"); 795 MODULE_ALIAS("dmi:*:*Acer*:pnAO521*:"); 796 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:"); 797 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5739G:"); 798 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*One*753:"); 799 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5315:"); 800 MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:"); 801 MODULE_ALIAS("dmi:*:*Acer*:TM8573T:"); 802 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:"); 803 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:"); 804 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:"); 805 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:"); 806 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:"); 807 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:"); 808 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:"); 809 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:"); 810 MODULE_ALIAS("dmi:*:*Acer*:pnExtensa 5420*:"); 811 812 module_init(acerhdf_init); 813 module_exit(acerhdf_exit); 814