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 * http://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_TEMP_CRIT 89000 50 #define ACERHDF_FAN_OFF 0 51 #define ACERHDF_FAN_AUTO 1 52 53 /* 54 * No matter what value the user puts into the fanon variable, turn on the fan 55 * at 80 degree Celsius to prevent hardware damage 56 */ 57 #define ACERHDF_MAX_FANON 80000 58 59 /* 60 * Maximum interval between two temperature checks is 15 seconds, as the die 61 * can get hot really fast under heavy load (plus we shouldn't forget about 62 * possible impact of _external_ aggressive sources such as heaters, sun etc.) 63 */ 64 #define ACERHDF_MAX_INTERVAL 15 65 66 #ifdef START_IN_KERNEL_MODE 67 static int kernelmode = 1; 68 #else 69 static int kernelmode; 70 #endif 71 72 static unsigned int interval = 10; 73 static unsigned int fanon = 60000; 74 static unsigned int fanoff = 53000; 75 static unsigned int verbose; 76 static unsigned int list_supported; 77 static unsigned int fanstate = ACERHDF_FAN_AUTO; 78 static char force_bios[16]; 79 static char force_product[16]; 80 static unsigned int prev_interval; 81 static struct thermal_zone_device *thz_dev; 82 static struct thermal_cooling_device *cl_dev; 83 static struct platform_device *acerhdf_dev; 84 85 module_param(kernelmode, uint, 0); 86 MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off"); 87 module_param(interval, uint, 0600); 88 MODULE_PARM_DESC(interval, "Polling interval of temperature check"); 89 module_param(fanon, uint, 0600); 90 MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature"); 91 module_param(fanoff, uint, 0600); 92 MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature"); 93 module_param(verbose, uint, 0600); 94 MODULE_PARM_DESC(verbose, "Enable verbose dmesg output"); 95 module_param(list_supported, uint, 0600); 96 MODULE_PARM_DESC(list_supported, "List supported models and BIOS versions"); 97 module_param_string(force_bios, force_bios, 16, 0); 98 MODULE_PARM_DESC(force_bios, "Pretend system has this known supported BIOS version"); 99 module_param_string(force_product, force_product, 16, 0); 100 MODULE_PARM_DESC(force_product, "Pretend system is this known supported model"); 101 102 /* 103 * cmd_off: to switch the fan completely off and check if the fan is off 104 * cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then 105 * the fan speed depending on the temperature 106 */ 107 struct fancmd { 108 u8 cmd_off; 109 u8 cmd_auto; 110 }; 111 112 struct manualcmd { 113 u8 mreg; 114 u8 moff; 115 }; 116 117 /* default register and command to disable fan in manual mode */ 118 static const struct manualcmd mcmd = { 119 .mreg = 0x94, 120 .moff = 0xff, 121 }; 122 123 /* BIOS settings - only used during probe */ 124 struct bios_settings { 125 const char *vendor; 126 const char *product; 127 const char *version; 128 u8 fanreg; 129 u8 tempreg; 130 struct fancmd cmd; 131 int mcmd_enable; 132 }; 133 134 /* This could be a daughter struct in the above, but not worth the redirect */ 135 struct ctrl_settings { 136 u8 fanreg; 137 u8 tempreg; 138 struct fancmd cmd; 139 int mcmd_enable; 140 }; 141 142 static struct ctrl_settings ctrl_cfg __read_mostly; 143 144 /* Register addresses and values for different BIOS versions */ 145 static const struct bios_settings bios_tbl[] __initconst = { 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 Aspire 7551 */ 228 {"Acer", "Aspire 7551", "V1.18", 0x93, 0xa8, {0x14, 0x04}, 1}, 229 /* Acer TravelMate TM8573T */ 230 {"Acer", "TM8573T", "V1.13", 0x93, 0xa8, {0x14, 0x04}, 1}, 231 /* Gateway */ 232 {"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x00}, 0}, 233 {"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x00}, 0}, 234 {"Gateway", "LT31", "v1.3103", 0x55, 0x58, {0x9e, 0x00}, 0}, 235 {"Gateway", "LT31", "v1.3201", 0x55, 0x58, {0x9e, 0x00}, 0}, 236 {"Gateway", "LT31", "v1.3302", 0x55, 0x58, {0x9e, 0x00}, 0}, 237 {"Gateway", "LT31", "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0}, 238 {"Gateway", "LT31", "v1.3307", 0x55, 0x58, {0x9e, 0x00}, 0}, 239 /* Packard Bell */ 240 {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00}, 0}, 241 {"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00}, 0}, 242 {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00}, 0}, 243 {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00}, 0}, 244 {"Packard Bell", "ENBFT", "V1.3118", 0x55, 0x58, {0x9e, 0x00}, 0}, 245 {"Packard Bell", "ENBFT", "V1.3127", 0x55, 0x58, {0x9e, 0x00}, 0}, 246 {"Packard Bell", "DOTMU", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0}, 247 {"Packard Bell", "DOTMU", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0}, 248 {"Packard Bell", "DOTMU", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0}, 249 {"Packard Bell", "DOTMU", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0}, 250 {"Packard Bell", "DOTMU", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0}, 251 {"Packard Bell", "DOTMU", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0}, 252 {"Packard Bell", "DOTMU", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0}, 253 {"Packard Bell", "DOTMU", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0}, 254 {"Packard Bell", "DOTMA", "v1.3201", 0x55, 0x58, {0x9e, 0x00}, 0}, 255 {"Packard Bell", "DOTMA", "v1.3302", 0x55, 0x58, {0x9e, 0x00}, 0}, 256 {"Packard Bell", "DOTMA", "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0}, 257 {"Packard Bell", "DOTVR46", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0}, 258 /* pewpew-terminator */ 259 {"", "", "", 0, 0, {0, 0}, 0} 260 }; 261 262 /* 263 * this struct is used to instruct thermal layer to use bang_bang instead of 264 * default governor for acerhdf 265 */ 266 static struct thermal_zone_params acerhdf_zone_params = { 267 .governor_name = "bang_bang", 268 }; 269 270 static int acerhdf_get_temp(int *temp) 271 { 272 u8 read_temp; 273 274 if (ec_read(ctrl_cfg.tempreg, &read_temp)) 275 return -EINVAL; 276 277 *temp = read_temp * 1000; 278 279 return 0; 280 } 281 282 static int acerhdf_get_fanstate(int *state) 283 { 284 u8 fan; 285 286 if (ec_read(ctrl_cfg.fanreg, &fan)) 287 return -EINVAL; 288 289 if (fan != ctrl_cfg.cmd.cmd_off) 290 *state = ACERHDF_FAN_AUTO; 291 else 292 *state = ACERHDF_FAN_OFF; 293 294 return 0; 295 } 296 297 static void acerhdf_change_fanstate(int state) 298 { 299 unsigned char cmd; 300 301 if (verbose) 302 pr_notice("fan %s\n", state == ACERHDF_FAN_OFF ? "OFF" : "ON"); 303 304 if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) { 305 pr_err("invalid fan state %d requested, setting to auto!\n", 306 state); 307 state = ACERHDF_FAN_AUTO; 308 } 309 310 cmd = (state == ACERHDF_FAN_OFF) ? ctrl_cfg.cmd.cmd_off 311 : ctrl_cfg.cmd.cmd_auto; 312 fanstate = state; 313 314 ec_write(ctrl_cfg.fanreg, cmd); 315 316 if (ctrl_cfg.mcmd_enable && state == ACERHDF_FAN_OFF) { 317 if (verbose) 318 pr_notice("turning off fan manually\n"); 319 ec_write(mcmd.mreg, mcmd.moff); 320 } 321 } 322 323 static void acerhdf_check_param(struct thermal_zone_device *thermal) 324 { 325 if (fanon > ACERHDF_MAX_FANON) { 326 pr_err("fanon temperature too high, set to %d\n", 327 ACERHDF_MAX_FANON); 328 fanon = ACERHDF_MAX_FANON; 329 } 330 331 if (kernelmode && prev_interval != interval) { 332 if (interval > ACERHDF_MAX_INTERVAL) { 333 pr_err("interval too high, set to %d\n", 334 ACERHDF_MAX_INTERVAL); 335 interval = ACERHDF_MAX_INTERVAL; 336 } 337 if (verbose) 338 pr_notice("interval changed to: %d\n", interval); 339 thermal->polling_delay = interval*1000; 340 prev_interval = interval; 341 } 342 } 343 344 /* 345 * This is the thermal zone callback which does the delayed polling of the fan 346 * state. We do check /sysfs-originating settings here in acerhdf_check_param() 347 * as late as the polling interval is since we can't do that in the respective 348 * accessors of the module parameters. 349 */ 350 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, int *t) 351 { 352 int temp, err = 0; 353 354 acerhdf_check_param(thermal); 355 356 err = acerhdf_get_temp(&temp); 357 if (err) 358 return err; 359 360 if (verbose) 361 pr_notice("temp %d\n", temp); 362 363 *t = temp; 364 return 0; 365 } 366 367 static int acerhdf_bind(struct thermal_zone_device *thermal, 368 struct thermal_cooling_device *cdev) 369 { 370 /* if the cooling device is the one from acerhdf bind it */ 371 if (cdev != cl_dev) 372 return 0; 373 374 if (thermal_zone_bind_cooling_device(thermal, 0, cdev, 375 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT, 376 THERMAL_WEIGHT_DEFAULT)) { 377 pr_err("error binding cooling dev\n"); 378 return -EINVAL; 379 } 380 return 0; 381 } 382 383 static int acerhdf_unbind(struct thermal_zone_device *thermal, 384 struct thermal_cooling_device *cdev) 385 { 386 if (cdev != cl_dev) 387 return 0; 388 389 if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) { 390 pr_err("error unbinding cooling dev\n"); 391 return -EINVAL; 392 } 393 return 0; 394 } 395 396 static inline void acerhdf_revert_to_bios_mode(void) 397 { 398 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 399 kernelmode = 0; 400 if (thz_dev) 401 thz_dev->polling_delay = 0; 402 403 pr_notice("kernel mode fan control OFF\n"); 404 } 405 static inline void acerhdf_enable_kernelmode(void) 406 { 407 kernelmode = 1; 408 409 thz_dev->polling_delay = interval*1000; 410 pr_notice("kernel mode fan control ON\n"); 411 } 412 413 /* 414 * set operation mode; 415 * enabled: the thermal layer of the kernel takes care about 416 * the temperature and the fan. 417 * disabled: the BIOS takes control of the fan. 418 */ 419 static int acerhdf_set_mode(struct thermal_zone_device *thermal, 420 enum thermal_device_mode mode) 421 { 422 if (mode == THERMAL_DEVICE_DISABLED && kernelmode) 423 acerhdf_revert_to_bios_mode(); 424 else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode) 425 acerhdf_enable_kernelmode(); 426 427 return 0; 428 } 429 430 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip, 431 enum thermal_trip_type *type) 432 { 433 if (trip == 0) 434 *type = THERMAL_TRIP_ACTIVE; 435 else if (trip == 1) 436 *type = THERMAL_TRIP_CRITICAL; 437 else 438 return -EINVAL; 439 440 return 0; 441 } 442 443 static int acerhdf_get_trip_hyst(struct thermal_zone_device *thermal, int trip, 444 int *temp) 445 { 446 if (trip != 0) 447 return -EINVAL; 448 449 *temp = fanon - fanoff; 450 451 return 0; 452 } 453 454 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip, 455 int *temp) 456 { 457 if (trip == 0) 458 *temp = fanon; 459 else if (trip == 1) 460 *temp = ACERHDF_TEMP_CRIT; 461 else 462 return -EINVAL; 463 464 return 0; 465 } 466 467 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal, 468 int *temperature) 469 { 470 *temperature = ACERHDF_TEMP_CRIT; 471 return 0; 472 } 473 474 /* bind callback functions to thermalzone */ 475 static struct thermal_zone_device_ops acerhdf_dev_ops = { 476 .bind = acerhdf_bind, 477 .unbind = acerhdf_unbind, 478 .get_temp = acerhdf_get_ec_temp, 479 .set_mode = acerhdf_set_mode, 480 .get_trip_type = acerhdf_get_trip_type, 481 .get_trip_hyst = acerhdf_get_trip_hyst, 482 .get_trip_temp = acerhdf_get_trip_temp, 483 .get_crit_temp = acerhdf_get_crit_temp, 484 }; 485 486 487 /* 488 * cooling device callback functions 489 * get maximal fan cooling state 490 */ 491 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev, 492 unsigned long *state) 493 { 494 *state = 1; 495 496 return 0; 497 } 498 499 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev, 500 unsigned long *state) 501 { 502 int err = 0, tmp; 503 504 err = acerhdf_get_fanstate(&tmp); 505 if (err) 506 return err; 507 508 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0; 509 return 0; 510 } 511 512 /* change current fan state - is overwritten when running in kernel mode */ 513 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev, 514 unsigned long state) 515 { 516 int cur_temp, cur_state, err = 0; 517 518 if (!kernelmode) 519 return 0; 520 521 err = acerhdf_get_temp(&cur_temp); 522 if (err) { 523 pr_err("error reading temperature, hand off control to BIOS\n"); 524 goto err_out; 525 } 526 527 err = acerhdf_get_fanstate(&cur_state); 528 if (err) { 529 pr_err("error reading fan state, hand off control to BIOS\n"); 530 goto err_out; 531 } 532 533 if (state == 0) { 534 if (cur_state == ACERHDF_FAN_AUTO) 535 acerhdf_change_fanstate(ACERHDF_FAN_OFF); 536 } else { 537 if (cur_state == ACERHDF_FAN_OFF) 538 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 539 } 540 return 0; 541 542 err_out: 543 acerhdf_revert_to_bios_mode(); 544 return -EINVAL; 545 } 546 547 /* bind fan callbacks to fan device */ 548 static const struct thermal_cooling_device_ops acerhdf_cooling_ops = { 549 .get_max_state = acerhdf_get_max_state, 550 .get_cur_state = acerhdf_get_cur_state, 551 .set_cur_state = acerhdf_set_cur_state, 552 }; 553 554 /* suspend / resume functionality */ 555 static int acerhdf_suspend(struct device *dev) 556 { 557 if (kernelmode) 558 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 559 560 if (verbose) 561 pr_notice("going suspend\n"); 562 563 return 0; 564 } 565 566 static int acerhdf_probe(struct platform_device *device) 567 { 568 return 0; 569 } 570 571 static int acerhdf_remove(struct platform_device *device) 572 { 573 return 0; 574 } 575 576 static const struct dev_pm_ops acerhdf_pm_ops = { 577 .suspend = acerhdf_suspend, 578 .freeze = acerhdf_suspend, 579 }; 580 581 static struct platform_driver acerhdf_driver = { 582 .driver = { 583 .name = "acerhdf", 584 .pm = &acerhdf_pm_ops, 585 }, 586 .probe = acerhdf_probe, 587 .remove = acerhdf_remove, 588 }; 589 590 /* checks if str begins with start */ 591 static int str_starts_with(const char *str, const char *start) 592 { 593 unsigned long str_len = 0, start_len = 0; 594 595 str_len = strlen(str); 596 start_len = strlen(start); 597 598 if (str_len >= start_len && 599 !strncmp(str, start, start_len)) 600 return 1; 601 602 return 0; 603 } 604 605 /* check hardware */ 606 static int __init acerhdf_check_hardware(void) 607 { 608 char const *vendor, *version, *product; 609 const struct bios_settings *bt = NULL; 610 int found = 0; 611 612 /* get BIOS data */ 613 vendor = dmi_get_system_info(DMI_SYS_VENDOR); 614 version = dmi_get_system_info(DMI_BIOS_VERSION); 615 product = dmi_get_system_info(DMI_PRODUCT_NAME); 616 617 if (!vendor || !version || !product) { 618 pr_err("error getting hardware information\n"); 619 return -EINVAL; 620 } 621 622 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER); 623 624 if (list_supported) { 625 pr_info("List of supported Manufacturer/Model/BIOS:\n"); 626 pr_info("---------------------------------------------------\n"); 627 for (bt = bios_tbl; bt->vendor[0]; bt++) { 628 pr_info("%-13s | %-17s | %-10s\n", bt->vendor, 629 bt->product, bt->version); 630 } 631 pr_info("---------------------------------------------------\n"); 632 return -ECANCELED; 633 } 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 found = 1; 661 break; 662 } 663 } 664 665 if (!found) { 666 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n", 667 vendor, product, version); 668 return -EINVAL; 669 } 670 671 /* Copy control settings from BIOS table before we free it. */ 672 ctrl_cfg.fanreg = bt->fanreg; 673 ctrl_cfg.tempreg = bt->tempreg; 674 memcpy(&ctrl_cfg.cmd, &bt->cmd, sizeof(struct fancmd)); 675 ctrl_cfg.mcmd_enable = bt->mcmd_enable; 676 677 /* 678 * if started with kernel mode off, prevent the kernel from switching 679 * off the fan 680 */ 681 if (!kernelmode) { 682 pr_notice("Fan control off, to enable do:\n"); 683 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zoneN/mode # N=0,1,2...\n"); 684 } 685 686 return 0; 687 } 688 689 static int __init acerhdf_register_platform(void) 690 { 691 int err = 0; 692 693 err = platform_driver_register(&acerhdf_driver); 694 if (err) 695 return err; 696 697 acerhdf_dev = platform_device_alloc("acerhdf", -1); 698 if (!acerhdf_dev) { 699 err = -ENOMEM; 700 goto err_device_alloc; 701 } 702 err = platform_device_add(acerhdf_dev); 703 if (err) 704 goto err_device_add; 705 706 return 0; 707 708 err_device_add: 709 platform_device_put(acerhdf_dev); 710 err_device_alloc: 711 platform_driver_unregister(&acerhdf_driver); 712 return err; 713 } 714 715 static void acerhdf_unregister_platform(void) 716 { 717 platform_device_unregister(acerhdf_dev); 718 platform_driver_unregister(&acerhdf_driver); 719 } 720 721 static int __init acerhdf_register_thermal(void) 722 { 723 int ret; 724 725 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL, 726 &acerhdf_cooling_ops); 727 728 if (IS_ERR(cl_dev)) 729 return -EINVAL; 730 731 thz_dev = thermal_zone_device_register("acerhdf", 2, 0, NULL, 732 &acerhdf_dev_ops, 733 &acerhdf_zone_params, 0, 734 (kernelmode) ? interval*1000 : 0); 735 if (IS_ERR(thz_dev)) 736 return -EINVAL; 737 738 if (kernelmode) 739 ret = thermal_zone_device_enable(thz_dev); 740 else 741 ret = thermal_zone_device_disable(thz_dev); 742 if (ret) 743 return ret; 744 745 if (strcmp(thz_dev->governor->name, 746 acerhdf_zone_params.governor_name)) { 747 pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n", 748 acerhdf_zone_params.governor_name); 749 return -EINVAL; 750 } 751 752 return 0; 753 } 754 755 static void acerhdf_unregister_thermal(void) 756 { 757 if (cl_dev) { 758 thermal_cooling_device_unregister(cl_dev); 759 cl_dev = NULL; 760 } 761 762 if (thz_dev) { 763 thermal_zone_device_unregister(thz_dev); 764 thz_dev = NULL; 765 } 766 } 767 768 static int __init acerhdf_init(void) 769 { 770 int err = 0; 771 772 err = acerhdf_check_hardware(); 773 if (err) 774 goto out_err; 775 776 err = acerhdf_register_platform(); 777 if (err) 778 goto out_err; 779 780 err = acerhdf_register_thermal(); 781 if (err) 782 goto err_unreg; 783 784 return 0; 785 786 err_unreg: 787 acerhdf_unregister_thermal(); 788 acerhdf_unregister_platform(); 789 790 out_err: 791 return err; 792 } 793 794 static void __exit acerhdf_exit(void) 795 { 796 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 797 acerhdf_unregister_thermal(); 798 acerhdf_unregister_platform(); 799 } 800 801 MODULE_LICENSE("GPL"); 802 MODULE_AUTHOR("Peter Kaestle"); 803 MODULE_DESCRIPTION("Aspire One temperature and fan driver"); 804 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:"); 805 MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:"); 806 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:"); 807 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:"); 808 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5755G:"); 809 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:"); 810 MODULE_ALIAS("dmi:*:*Acer*:pnAO521*:"); 811 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:"); 812 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5739G:"); 813 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*One*753:"); 814 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5315:"); 815 MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:"); 816 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*7551:"); 817 MODULE_ALIAS("dmi:*:*Acer*:TM8573T:"); 818 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:"); 819 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:"); 820 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:"); 821 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:"); 822 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:"); 823 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:"); 824 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:"); 825 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:"); 826 MODULE_ALIAS("dmi:*:*Acer*:pnExtensa*5420*:"); 827 828 module_init(acerhdf_init); 829 module_exit(acerhdf_exit); 830