1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * acerhdf - A driver which monitors the temperature 4 * of the aspire one netbook, turns on/off the fan 5 * as soon as the upper/lower threshold is reached. 6 * 7 * (C) 2009 - Peter Kaestle peter (a) piie.net 8 * https://piie.net 9 * 2009 Borislav Petkov bp (a) alien8.de 10 * 11 * Inspired by and many thanks to: 12 * o acerfand - Rachel Greenham 13 * o acer_ec.pl - Michael Kurz michi.kurz (at) googlemail.com 14 * - Petr Tomasek tomasek (#) etf,cuni,cz 15 * - Carlos Corbacho cathectic (at) gmail.com 16 * o lkml - Matthew Garrett 17 * - Borislav Petkov 18 * - Andreas Mohr 19 */ 20 21#define pr_fmt(fmt) "acerhdf: " fmt 22 23#include <linux/kernel.h> 24#include <linux/module.h> 25#include <linux/dmi.h> 26#include <linux/acpi.h> 27#include <linux/thermal.h> 28#include <linux/platform_device.h> 29 30/* 31 * The driver is started with "kernel mode off" by default. That means, the BIOS 32 * is still in control of the fan. In this mode the driver allows to read the 33 * temperature of the cpu and a userspace tool may take over control of the fan. 34 * If the driver is switched to "kernel mode" (e.g. via module parameter) the 35 * driver is in full control of the fan. If you want the module to be started in 36 * kernel mode by default, define the following: 37 */ 38#undef START_IN_KERNEL_MODE 39 40#define DRV_VER "0.7.0" 41 42/* 43 * According to the Atom N270 datasheet, 44 * (http://download.intel.com/design/processor/datashts/320032.pdf) the 45 * CPU's optimal operating limits denoted in junction temperature as 46 * measured by the on-die thermal monitor are within 0 <= Tj <= 90. So, 47 * assume 89��C is critical temperature. 48 */ 49#define ACERHDF_DEFAULT_TEMP_FANON 60000 50#define ACERHDF_DEFAULT_TEMP_FANOFF 53000 51#define ACERHDF_TEMP_CRIT 89000 52#define ACERHDF_FAN_OFF 0 53#define ACERHDF_FAN_AUTO 1 54 55/* 56 * No matter what value the user puts into the fanon variable, turn on the fan 57 * at 80 degree Celsius to prevent hardware damage 58 */ 59#define ACERHDF_MAX_FANON 80000 60 61/* 62 * Maximum interval between two temperature checks is 15 seconds, as the die 63 * can get hot really fast under heavy load (plus we shouldn't forget about 64 * possible impact of _external_ aggressive sources such as heaters, sun etc.) 65 */ 66#define ACERHDF_MAX_INTERVAL 15 67 68#ifdef START_IN_KERNEL_MODE 69static int kernelmode = 1; 70#else 71static int kernelmode; 72#endif 73 74static unsigned int interval = 10; 75static unsigned int fanon = ACERHDF_DEFAULT_TEMP_FANON; 76static unsigned int fanoff = ACERHDF_DEFAULT_TEMP_FANOFF; 77static unsigned int verbose; 78static unsigned int list_supported; 79static unsigned int fanstate = ACERHDF_FAN_AUTO; 80static char force_bios[16]; 81static char force_product[16]; 82static struct thermal_zone_device *thz_dev; 83static struct thermal_cooling_device *cl_dev; 84static struct platform_device *acerhdf_dev; 85 86module_param(kernelmode, uint, 0); 87MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off"); 88module_param(fanon, uint, 0600); 89MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature"); 90module_param(fanoff, uint, 0600); 91MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature"); 92module_param(verbose, uint, 0600); 93MODULE_PARM_DESC(verbose, "Enable verbose dmesg output"); 94module_param(list_supported, uint, 0600); 95MODULE_PARM_DESC(list_supported, "List supported models and BIOS versions"); 96module_param_string(force_bios, force_bios, 16, 0); 97MODULE_PARM_DESC(force_bios, "Pretend system has this known supported BIOS version"); 98module_param_string(force_product, force_product, 16, 0); 99MODULE_PARM_DESC(force_product, "Pretend system is this known supported model"); 100 101/* 102 * cmd_off: to switch the fan completely off and check if the fan is off 103 * cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then 104 * the fan speed depending on the temperature 105 */ 106struct fancmd { 107 u8 cmd_off; 108 u8 cmd_auto; 109}; 110 111struct manualcmd { 112 u8 mreg; 113 u8 moff; 114}; 115 116/* default register and command to disable fan in manual mode */ 117static const struct manualcmd mcmd = { 118 .mreg = 0x94, 119 .moff = 0xff, 120}; 121 122/* BIOS settings - only used during probe */ 123struct bios_settings { 124 const char *vendor; 125 const char *product; 126 const char *version; 127 u8 fanreg; 128 u8 tempreg; 129 struct fancmd cmd; 130 int mcmd_enable; 131}; 132 133/* This could be a daughter struct in the above, but not worth the redirect */ 134struct ctrl_settings { 135 u8 fanreg; 136 u8 tempreg; 137 struct fancmd cmd; 138 int mcmd_enable; 139}; 140 141static struct thermal_trip trips[] = { 142 [0] = { .temperature = ACERHDF_DEFAULT_TEMP_FANON, 143 .hysteresis = ACERHDF_DEFAULT_TEMP_FANON - ACERHDF_DEFAULT_TEMP_FANOFF, 144 .type = THERMAL_TRIP_ACTIVE }, 145 146 [1] = { .temperature = ACERHDF_TEMP_CRIT, 147 .type = THERMAL_TRIP_CRITICAL } 148}; 149 150static struct ctrl_settings ctrl_cfg __read_mostly; 151 152/* Register addresses and values for different BIOS versions */ 153static const struct bios_settings bios_tbl[] __initconst = { 154 /* AOA110 */ 155 {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00}, 0}, 156 {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0}, 157 {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00}, 0}, 158 {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00}, 0}, 159 {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00}, 0}, 160 {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00}, 0}, 161 {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00}, 0}, 162 {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00}, 0}, 163 {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00}, 0}, 164 /* AOA150 */ 165 {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0}, 166 {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00}, 0}, 167 {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0}, 168 {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00}, 0}, 169 {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00}, 0}, 170 {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00}, 0}, 171 {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00}, 0}, 172 {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0}, 173 /* LT1005u */ 174 {"Acer", "LT-10Q", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0}, 175 /* Acer 1410 */ 176 {"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0}, 177 {"Acer", "Aspire 1410", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0}, 178 {"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0}, 179 {"Acer", "Aspire 1410", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0}, 180 {"Acer", "Aspire 1410", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0}, 181 {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0}, 182 {"Acer", "Aspire 1410", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0}, 183 {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0}, 184 {"Acer", "Aspire 1410", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0}, 185 {"Acer", "Aspire 1410", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0}, 186 {"Acer", "Aspire 1410", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0}, 187 /* Acer 1810xx */ 188 {"Acer", "Aspire 1810TZ", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0}, 189 {"Acer", "Aspire 1810T", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0}, 190 {"Acer", "Aspire 1810TZ", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0}, 191 {"Acer", "Aspire 1810T", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0}, 192 {"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0}, 193 {"Acer", "Aspire 1810T", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0}, 194 {"Acer", "Aspire 1810TZ", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0}, 195 {"Acer", "Aspire 1810T", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0}, 196 {"Acer", "Aspire 1810TZ", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0}, 197 {"Acer", "Aspire 1810T", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0}, 198 {"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0}, 199 {"Acer", "Aspire 1810T", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0}, 200 {"Acer", "Aspire 1810TZ", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0}, 201 {"Acer", "Aspire 1810T", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0}, 202 {"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0}, 203 {"Acer", "Aspire 1810T", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0}, 204 {"Acer", "Aspire 1810TZ", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0}, 205 {"Acer", "Aspire 1810T", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0}, 206 {"Acer", "Aspire 1810TZ", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0}, 207 {"Acer", "Aspire 1810T", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0}, 208 {"Acer", "Aspire 1810TZ", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0}, 209 {"Acer", "Aspire 1810T", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0}, 210 /* Acer 5755G */ 211 {"Acer", "Aspire 5755G", "V1.20", 0xab, 0xb4, {0x00, 0x08}, 0}, 212 {"Acer", "Aspire 5755G", "V1.21", 0xab, 0xb3, {0x00, 0x08}, 0}, 213 /* Acer 521 */ 214 {"Acer", "AO521", "V1.11", 0x55, 0x58, {0x1f, 0x00}, 0}, 215 /* Acer 531 */ 216 {"Acer", "AO531h", "v0.3104", 0x55, 0x58, {0x20, 0x00}, 0}, 217 {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00}, 0}, 218 {"Acer", "AO531h", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0}, 219 /* Acer 751 */ 220 {"Acer", "AO751h", "V0.3206", 0x55, 0x58, {0x21, 0x00}, 0}, 221 {"Acer", "AO751h", "V0.3212", 0x55, 0x58, {0x21, 0x00}, 0}, 222 /* Acer 753 */ 223 {"Acer", "Aspire One 753", "V1.24", 0x93, 0xac, {0x14, 0x04}, 1}, 224 /* Acer 1825 */ 225 {"Acer", "Aspire 1825PTZ", "V1.3118", 0x55, 0x58, {0x9e, 0x00}, 0}, 226 {"Acer", "Aspire 1825PTZ", "V1.3127", 0x55, 0x58, {0x9e, 0x00}, 0}, 227 /* Acer Extensa 5420 */ 228 {"Acer", "Extensa 5420", "V1.17", 0x93, 0xac, {0x14, 0x04}, 1}, 229 /* Acer Aspire 5315 */ 230 {"Acer", "Aspire 5315", "V1.19", 0x93, 0xac, {0x14, 0x04}, 1}, 231 /* Acer Aspire 5739 */ 232 {"Acer", "Aspire 5739G", "V1.3311", 0x55, 0x58, {0x20, 0x00}, 0}, 233 /* Acer TravelMate 7730 */ 234 {"Acer", "TravelMate 7730G", "v0.3509", 0x55, 0x58, {0xaf, 0x00}, 0}, 235 /* Acer Aspire 7551 */ 236 {"Acer", "Aspire 7551", "V1.18", 0x93, 0xa8, {0x14, 0x04}, 1}, 237 /* Acer TravelMate TM8573T */ 238 {"Acer", "TM8573T", "V1.13", 0x93, 0xa8, {0x14, 0x04}, 1}, 239 /* Gateway */ 240 {"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x00}, 0}, 241 {"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x00}, 0}, 242 {"Gateway", "LT31", "v1.3103", 0x55, 0x58, {0x9e, 0x00}, 0}, 243 {"Gateway", "LT31", "v1.3201", 0x55, 0x58, {0x9e, 0x00}, 0}, 244 {"Gateway", "LT31", "v1.3302", 0x55, 0x58, {0x9e, 0x00}, 0}, 245 {"Gateway", "LT31", "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0}, 246 {"Gateway", "LT31", "v1.3307", 0x55, 0x58, {0x9e, 0x00}, 0}, 247 /* Packard Bell */ 248 {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00}, 0}, 249 {"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00}, 0}, 250 {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00}, 0}, 251 {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00}, 0}, 252 {"Packard Bell", "ENBFT", "V1.3118", 0x55, 0x58, {0x9e, 0x00}, 0}, 253 {"Packard Bell", "ENBFT", "V1.3127", 0x55, 0x58, {0x9e, 0x00}, 0}, 254 {"Packard Bell", "DOTMU", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0}, 255 {"Packard Bell", "DOTMU", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0}, 256 {"Packard Bell", "DOTMU", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0}, 257 {"Packard Bell", "DOTMU", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0}, 258 {"Packard Bell", "DOTMU", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0}, 259 {"Packard Bell", "DOTMU", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0}, 260 {"Packard Bell", "DOTMU", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0}, 261 {"Packard Bell", "DOTMU", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0}, 262 {"Packard Bell", "DOTMA", "v1.3201", 0x55, 0x58, {0x9e, 0x00}, 0}, 263 {"Packard Bell", "DOTMA", "v1.3302", 0x55, 0x58, {0x9e, 0x00}, 0}, 264 {"Packard Bell", "DOTMA", "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0}, 265 {"Packard Bell", "DOTVR46", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0}, 266 /* pewpew-terminator */ 267 {"", "", "", 0, 0, {0, 0}, 0} 268}; 269 270/* 271 * this struct is used to instruct thermal layer to use bang_bang instead of 272 * default governor for acerhdf 273 */ 274static struct thermal_zone_params acerhdf_zone_params = { 275 .governor_name = "bang_bang", 276}; 277 278static int acerhdf_get_temp(int *temp) 279{ 280 u8 read_temp; 281 282 if (ec_read(ctrl_cfg.tempreg, &read_temp)) 283 return -EINVAL; 284 285 *temp = read_temp * 1000; 286 287 return 0; 288} 289 290static int acerhdf_get_fanstate(int *state) 291{ 292 u8 fan; 293 294 if (ec_read(ctrl_cfg.fanreg, &fan)) 295 return -EINVAL; 296 297 if (fan != ctrl_cfg.cmd.cmd_off) 298 *state = ACERHDF_FAN_AUTO; 299 else 300 *state = ACERHDF_FAN_OFF; 301 302 return 0; 303} 304 305static void acerhdf_change_fanstate(int state) 306{ 307 unsigned char cmd; 308 309 if (verbose) 310 pr_notice("fan %s\n", state == ACERHDF_FAN_OFF ? "OFF" : "ON"); 311 312 if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) { 313 pr_err("invalid fan state %d requested, setting to auto!\n", 314 state); 315 state = ACERHDF_FAN_AUTO; 316 } 317 318 cmd = (state == ACERHDF_FAN_OFF) ? ctrl_cfg.cmd.cmd_off 319 : ctrl_cfg.cmd.cmd_auto; 320 fanstate = state; 321 322 ec_write(ctrl_cfg.fanreg, cmd); 323 324 if (ctrl_cfg.mcmd_enable && state == ACERHDF_FAN_OFF) { 325 if (verbose) 326 pr_notice("turning off fan manually\n"); 327 ec_write(mcmd.mreg, mcmd.moff); 328 } 329} 330 331static void acerhdf_check_param(struct thermal_zone_device *thermal) 332{ 333 if (fanon > ACERHDF_MAX_FANON) { 334 pr_err("fanon temperature too high, set to %d\n", 335 ACERHDF_MAX_FANON); 336 fanon = ACERHDF_MAX_FANON; 337 } 338 339 if (fanon < fanoff) { 340 pr_err("fanoff temperature (%d) is above fanon temperature (%d), clamping to %d\n", 341 fanoff, fanon, fanon); 342 fanoff = fanon; 343 } 344 345 trips[0].temperature = fanon; 346 trips[0].hysteresis = fanon - fanoff; 347 348 if (kernelmode) { 349 if (interval > ACERHDF_MAX_INTERVAL) { 350 pr_err("interval too high, set to %d\n", 351 ACERHDF_MAX_INTERVAL); 352 interval = ACERHDF_MAX_INTERVAL; 353 } 354 355 if (verbose) 356 pr_notice("interval changed to: %d\n", interval); 357 } 358} 359 360/* 361 * This is the thermal zone callback which does the delayed polling of the fan 362 * state. We do check /sysfs-originating settings here in acerhdf_check_param() 363 * as late as the polling interval is since we can't do that in the respective 364 * accessors of the module parameters. 365 */ 366static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, int *t) 367{ 368 int temp, err = 0; 369 370 err = acerhdf_get_temp(&temp); 371 if (err) 372 return err; 373 374 if (verbose) 375 pr_notice("temp %d\n", temp); 376 377 *t = temp; 378 return 0; 379} 380 381static int acerhdf_bind(struct thermal_zone_device *thermal, 382 struct thermal_cooling_device *cdev) 383{ 384 /* if the cooling device is the one from acerhdf bind it */ 385 if (cdev != cl_dev) 386 return 0; 387 388 if (thermal_zone_bind_cooling_device(thermal, 0, cdev, 389 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT, 390 THERMAL_WEIGHT_DEFAULT)) { 391 pr_err("error binding cooling dev\n"); 392 return -EINVAL; 393 } 394 return 0; 395} 396 397static int acerhdf_unbind(struct thermal_zone_device *thermal, 398 struct thermal_cooling_device *cdev) 399{ 400 if (cdev != cl_dev) 401 return 0; 402 403 if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) { 404 pr_err("error unbinding cooling dev\n"); 405 return -EINVAL; 406 } 407 return 0; 408} 409 410static inline void acerhdf_revert_to_bios_mode(void) 411{ 412 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 413 kernelmode = 0; 414 415 pr_notice("kernel mode fan control OFF\n"); 416} 417static inline void acerhdf_enable_kernelmode(void) 418{ 419 kernelmode = 1; 420 421 pr_notice("kernel mode fan control ON\n"); 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 */ 430static int acerhdf_change_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 441static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal, 442 int *temperature) 443{ 444 *temperature = ACERHDF_TEMP_CRIT; 445 return 0; 446} 447 448/* bind callback functions to thermalzone */ 449static struct thermal_zone_device_ops acerhdf_dev_ops = { 450 .bind = acerhdf_bind, 451 .unbind = acerhdf_unbind, 452 .get_temp = acerhdf_get_ec_temp, 453 .change_mode = acerhdf_change_mode, 454 .get_crit_temp = acerhdf_get_crit_temp, 455}; 456 457/* 458 * cooling device callback functions 459 * get maximal fan cooling state 460 */ 461static int acerhdf_get_max_state(struct thermal_cooling_device *cdev, 462 unsigned long *state) 463{ 464 *state = 1; 465 466 return 0; 467} 468 469static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev, 470 unsigned long *state) 471{ 472 int err = 0, tmp; 473 474 err = acerhdf_get_fanstate(&tmp); 475 if (err) 476 return err; 477 478 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0; 479 return 0; 480} 481 482/* change current fan state - is overwritten when running in kernel mode */ 483static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev, 484 unsigned long state) 485{ 486 int cur_temp, cur_state, err = 0; 487 488 if (!kernelmode) 489 return 0; 490 491 err = acerhdf_get_temp(&cur_temp); 492 if (err) { 493 pr_err("error reading temperature, hand off control to BIOS\n"); 494 goto err_out; 495 } 496 497 err = acerhdf_get_fanstate(&cur_state); 498 if (err) { 499 pr_err("error reading fan state, hand off control to BIOS\n"); 500 goto err_out; 501 } 502 503 if (state == 0) { 504 if (cur_state == ACERHDF_FAN_AUTO) 505 acerhdf_change_fanstate(ACERHDF_FAN_OFF); 506 } else { 507 if (cur_state == ACERHDF_FAN_OFF) 508 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 509 } 510 return 0; 511 512err_out: 513 acerhdf_revert_to_bios_mode(); 514 return -EINVAL; 515} 516 517/* bind fan callbacks to fan device */ 518static const struct thermal_cooling_device_ops acerhdf_cooling_ops = { 519 .get_max_state = acerhdf_get_max_state, 520 .get_cur_state = acerhdf_get_cur_state, 521 .set_cur_state = acerhdf_set_cur_state, 522}; 523 524/* suspend / resume functionality */ 525static int acerhdf_suspend(struct device *dev) 526{ 527 if (kernelmode) 528 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 529 530 if (verbose) 531 pr_notice("going suspend\n"); 532 533 return 0; 534} 535 536static int acerhdf_probe(struct platform_device *device) 537{ 538 return 0; 539} 540 541static const struct dev_pm_ops acerhdf_pm_ops = { 542 .suspend = acerhdf_suspend, 543 .freeze = acerhdf_suspend, 544}; 545 546static struct platform_driver acerhdf_driver = { 547 .driver = { 548 .name = "acerhdf", 549 .pm = &acerhdf_pm_ops, 550 }, 551 .probe = acerhdf_probe, 552}; 553 554/* check hardware */ 555static int __init acerhdf_check_hardware(void) 556{ 557 char const *vendor, *version, *product; 558 const struct bios_settings *bt = NULL; 559 int found = 0; 560 561 /* get BIOS data */ 562 vendor = dmi_get_system_info(DMI_SYS_VENDOR); 563 version = dmi_get_system_info(DMI_BIOS_VERSION); 564 product = dmi_get_system_info(DMI_PRODUCT_NAME); 565 566 if (!vendor || !version || !product) { 567 pr_err("error getting hardware information\n"); 568 return -EINVAL; 569 } 570 571 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER); 572 573 if (list_supported) { 574 pr_info("List of supported Manufacturer/Model/BIOS:\n"); 575 pr_info("---------------------------------------------------\n"); 576 for (bt = bios_tbl; bt->vendor[0]; bt++) { 577 pr_info("%-13s | %-17s | %-10s\n", bt->vendor, 578 bt->product, bt->version); 579 } 580 pr_info("---------------------------------------------------\n"); 581 return -ECANCELED; 582 } 583 584 if (force_bios[0]) { 585 version = force_bios; 586 pr_info("forcing BIOS version: %s\n", version); 587 kernelmode = 0; 588 } 589 590 if (force_product[0]) { 591 product = force_product; 592 pr_info("forcing BIOS product: %s\n", product); 593 kernelmode = 0; 594 } 595 596 if (verbose) 597 pr_info("BIOS info: %s %s, product: %s\n", 598 vendor, version, product); 599 600 /* search BIOS version and vendor in BIOS settings table */ 601 for (bt = bios_tbl; bt->vendor[0]; bt++) { 602 /* 603 * check if actual hardware BIOS vendor, product and version 604 * IDs start with the strings of BIOS table entry 605 */ 606 if (strstarts(vendor, bt->vendor) && 607 strstarts(product, bt->product) && 608 strstarts(version, bt->version)) { 609 found = 1; 610 break; 611 } 612 } 613 614 if (!found) { 615 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n", 616 vendor, product, version); 617 return -EINVAL; 618 } 619 620 /* Copy control settings from BIOS table before we free it. */ 621 ctrl_cfg.fanreg = bt->fanreg; 622 ctrl_cfg.tempreg = bt->tempreg; 623 memcpy(&ctrl_cfg.cmd, &bt->cmd, sizeof(struct fancmd)); 624 ctrl_cfg.mcmd_enable = bt->mcmd_enable; 625 626 /* 627 * if started with kernel mode off, prevent the kernel from switching 628 * off the fan 629 */ 630 if (!kernelmode) { 631 pr_notice("Fan control off, to enable do:\n"); 632 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zoneN/mode # N=0,1,2...\n"); 633 } 634 635 return 0; 636} 637 638static int __init acerhdf_register_platform(void) 639{ 640 int err = 0; 641 642 err = platform_driver_register(&acerhdf_driver); 643 if (err) 644 return err; 645 646 acerhdf_dev = platform_device_alloc("acerhdf", PLATFORM_DEVID_NONE); 647 if (!acerhdf_dev) { 648 err = -ENOMEM; 649 goto err_device_alloc; 650 } 651 err = platform_device_add(acerhdf_dev); 652 if (err) 653 goto err_device_add; 654 655 return 0; 656 657err_device_add: 658 platform_device_put(acerhdf_dev); 659err_device_alloc: 660 platform_driver_unregister(&acerhdf_driver); 661 return err; 662} 663 664static void acerhdf_unregister_platform(void) 665{ 666 platform_device_unregister(acerhdf_dev); 667 platform_driver_unregister(&acerhdf_driver); 668} 669 670static int __init acerhdf_register_thermal(void) 671{ 672 int ret; 673 674 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL, 675 &acerhdf_cooling_ops); 676 677 if (IS_ERR(cl_dev)) 678 return -EINVAL; 679 680 thz_dev = thermal_zone_device_register_with_trips("acerhdf", trips, ARRAY_SIZE(trips), 681 NULL, &acerhdf_dev_ops, 682 &acerhdf_zone_params, 0, 683 (kernelmode) ? interval*1000 : 0); 684 if (IS_ERR(thz_dev)) 685 return -EINVAL; 686 687 if (kernelmode) 688 ret = thermal_zone_device_enable(thz_dev); 689 else 690 ret = thermal_zone_device_disable(thz_dev); 691 if (ret) 692 return ret; 693 694 return 0; 695} 696 697static void acerhdf_unregister_thermal(void) 698{ 699 if (cl_dev) { 700 thermal_cooling_device_unregister(cl_dev); 701 cl_dev = NULL; 702 } 703 704 if (thz_dev) { 705 thermal_zone_device_unregister(thz_dev); 706 thz_dev = NULL; 707 } 708} 709 710static int __init acerhdf_init(void) 711{ 712 int err = 0; 713 714 err = acerhdf_check_hardware(); 715 if (err) 716 goto out_err; 717 718 err = acerhdf_register_platform(); 719 if (err) 720 goto out_err; 721 722 err = acerhdf_register_thermal(); 723 if (err) 724 goto err_unreg; 725 726 return 0; 727 728err_unreg: 729 acerhdf_unregister_thermal(); 730 acerhdf_unregister_platform(); 731 732out_err: 733 return err; 734} 735 736static void __exit acerhdf_exit(void) 737{ 738 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 739 acerhdf_unregister_thermal(); 740 acerhdf_unregister_platform(); 741} 742 743MODULE_LICENSE("GPL"); 744MODULE_AUTHOR("Peter Kaestle"); 745MODULE_DESCRIPTION("Aspire One temperature and fan driver"); 746MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:"); 747MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:"); 748MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:"); 749MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:"); 750MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5755G:"); 751MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:"); 752MODULE_ALIAS("dmi:*:*Acer*:pnAO521*:"); 753MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:"); 754MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5739G:"); 755MODULE_ALIAS("dmi:*:*Acer*:pnAspire*One*753:"); 756MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5315:"); 757MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:"); 758MODULE_ALIAS("dmi:*:*Acer*:pnAspire*7551:"); 759MODULE_ALIAS("dmi:*:*Acer*:TM8573T:"); 760MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:"); 761MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:"); 762MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:"); 763MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:"); 764MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:"); 765MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:"); 766MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:"); 767MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:"); 768MODULE_ALIAS("dmi:*:*Acer*:pnExtensa*5420*:"); 769 770module_init(acerhdf_init); 771module_exit(acerhdf_exit); 772 773static int interval_set_uint(const char *val, const struct kernel_param *kp) 774{ 775 int ret; 776 777 ret = param_set_uint(val, kp); 778 if (ret) 779 return ret; 780 781 acerhdf_check_param(thz_dev); 782 783 return 0; 784} 785 786static const struct kernel_param_ops interval_ops = { 787 .set = interval_set_uint, 788 .get = param_get_uint, 789}; 790 791module_param_cb(interval, &interval_ops, &interval, 0000); 792MODULE_PARM_DESC(interval, "Polling interval of temperature check"); 793