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_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(fanon, uint, 0600); 88 MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature"); 89 module_param(fanoff, uint, 0600); 90 MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature"); 91 module_param(verbose, uint, 0600); 92 MODULE_PARM_DESC(verbose, "Enable verbose dmesg output"); 93 module_param(list_supported, uint, 0600); 94 MODULE_PARM_DESC(list_supported, "List supported models and BIOS versions"); 95 module_param_string(force_bios, force_bios, 16, 0); 96 MODULE_PARM_DESC(force_bios, "Pretend system has this known supported BIOS version"); 97 module_param_string(force_product, force_product, 16, 0); 98 MODULE_PARM_DESC(force_product, "Pretend system is this known supported model"); 99 100 /* 101 * cmd_off: to switch the fan completely off and check if the fan is off 102 * cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then 103 * the fan speed depending on the temperature 104 */ 105 struct fancmd { 106 u8 cmd_off; 107 u8 cmd_auto; 108 }; 109 110 struct manualcmd { 111 u8 mreg; 112 u8 moff; 113 }; 114 115 /* default register and command to disable fan in manual mode */ 116 static const struct manualcmd mcmd = { 117 .mreg = 0x94, 118 .moff = 0xff, 119 }; 120 121 /* BIOS settings - only used during probe */ 122 struct bios_settings { 123 const char *vendor; 124 const char *product; 125 const char *version; 126 u8 fanreg; 127 u8 tempreg; 128 struct fancmd cmd; 129 int mcmd_enable; 130 }; 131 132 /* This could be a daughter struct in the above, but not worth the redirect */ 133 struct ctrl_settings { 134 u8 fanreg; 135 u8 tempreg; 136 struct fancmd cmd; 137 int mcmd_enable; 138 }; 139 140 static struct ctrl_settings ctrl_cfg __read_mostly; 141 142 /* Register addresses and values for different BIOS versions */ 143 static const struct bios_settings bios_tbl[] __initconst = { 144 /* AOA110 */ 145 {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00}, 0}, 146 {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0}, 147 {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00}, 0}, 148 {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00}, 0}, 149 {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00}, 0}, 150 {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00}, 0}, 151 {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00}, 0}, 152 {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00}, 0}, 153 {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00}, 0}, 154 /* AOA150 */ 155 {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0}, 156 {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00}, 0}, 157 {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0}, 158 {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00}, 0}, 159 {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00}, 0}, 160 {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00}, 0}, 161 {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00}, 0}, 162 {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0}, 163 /* LT1005u */ 164 {"Acer", "LT-10Q", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0}, 165 /* Acer 1410 */ 166 {"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0}, 167 {"Acer", "Aspire 1410", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0}, 168 {"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0}, 169 {"Acer", "Aspire 1410", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0}, 170 {"Acer", "Aspire 1410", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0}, 171 {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0}, 172 {"Acer", "Aspire 1410", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0}, 173 {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0}, 174 {"Acer", "Aspire 1410", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0}, 175 {"Acer", "Aspire 1410", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0}, 176 {"Acer", "Aspire 1410", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0}, 177 /* Acer 1810xx */ 178 {"Acer", "Aspire 1810TZ", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0}, 179 {"Acer", "Aspire 1810T", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0}, 180 {"Acer", "Aspire 1810TZ", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0}, 181 {"Acer", "Aspire 1810T", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0}, 182 {"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0}, 183 {"Acer", "Aspire 1810T", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0}, 184 {"Acer", "Aspire 1810TZ", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0}, 185 {"Acer", "Aspire 1810T", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0}, 186 {"Acer", "Aspire 1810TZ", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0}, 187 {"Acer", "Aspire 1810T", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0}, 188 {"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0}, 189 {"Acer", "Aspire 1810T", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0}, 190 {"Acer", "Aspire 1810TZ", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0}, 191 {"Acer", "Aspire 1810T", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0}, 192 {"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0}, 193 {"Acer", "Aspire 1810T", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0}, 194 {"Acer", "Aspire 1810TZ", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0}, 195 {"Acer", "Aspire 1810T", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0}, 196 {"Acer", "Aspire 1810TZ", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0}, 197 {"Acer", "Aspire 1810T", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0}, 198 {"Acer", "Aspire 1810TZ", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0}, 199 {"Acer", "Aspire 1810T", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0}, 200 /* Acer 5755G */ 201 {"Acer", "Aspire 5755G", "V1.20", 0xab, 0xb4, {0x00, 0x08}, 0}, 202 {"Acer", "Aspire 5755G", "V1.21", 0xab, 0xb3, {0x00, 0x08}, 0}, 203 /* Acer 521 */ 204 {"Acer", "AO521", "V1.11", 0x55, 0x58, {0x1f, 0x00}, 0}, 205 /* Acer 531 */ 206 {"Acer", "AO531h", "v0.3104", 0x55, 0x58, {0x20, 0x00}, 0}, 207 {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00}, 0}, 208 {"Acer", "AO531h", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0}, 209 /* Acer 751 */ 210 {"Acer", "AO751h", "V0.3206", 0x55, 0x58, {0x21, 0x00}, 0}, 211 {"Acer", "AO751h", "V0.3212", 0x55, 0x58, {0x21, 0x00}, 0}, 212 /* Acer 753 */ 213 {"Acer", "Aspire One 753", "V1.24", 0x93, 0xac, {0x14, 0x04}, 1}, 214 /* Acer 1825 */ 215 {"Acer", "Aspire 1825PTZ", "V1.3118", 0x55, 0x58, {0x9e, 0x00}, 0}, 216 {"Acer", "Aspire 1825PTZ", "V1.3127", 0x55, 0x58, {0x9e, 0x00}, 0}, 217 /* Acer Extensa 5420 */ 218 {"Acer", "Extensa 5420", "V1.17", 0x93, 0xac, {0x14, 0x04}, 1}, 219 /* Acer Aspire 5315 */ 220 {"Acer", "Aspire 5315", "V1.19", 0x93, 0xac, {0x14, 0x04}, 1}, 221 /* Acer Aspire 5739 */ 222 {"Acer", "Aspire 5739G", "V1.3311", 0x55, 0x58, {0x20, 0x00}, 0}, 223 /* Acer TravelMate 7730 */ 224 {"Acer", "TravelMate 7730G", "v0.3509", 0x55, 0x58, {0xaf, 0x00}, 0}, 225 /* Acer Aspire 7551 */ 226 {"Acer", "Aspire 7551", "V1.18", 0x93, 0xa8, {0x14, 0x04}, 1}, 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 {"Gateway", "LT31", "v1.3307", 0x55, 0x58, {0x9e, 0x00}, 0}, 237 /* Packard Bell */ 238 {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00}, 0}, 239 {"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00}, 0}, 240 {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00}, 0}, 241 {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00}, 0}, 242 {"Packard Bell", "ENBFT", "V1.3118", 0x55, 0x58, {0x9e, 0x00}, 0}, 243 {"Packard Bell", "ENBFT", "V1.3127", 0x55, 0x58, {0x9e, 0x00}, 0}, 244 {"Packard Bell", "DOTMU", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0}, 245 {"Packard Bell", "DOTMU", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0}, 246 {"Packard Bell", "DOTMU", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0}, 247 {"Packard Bell", "DOTMU", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0}, 248 {"Packard Bell", "DOTMU", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0}, 249 {"Packard Bell", "DOTMU", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0}, 250 {"Packard Bell", "DOTMU", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0}, 251 {"Packard Bell", "DOTMU", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0}, 252 {"Packard Bell", "DOTMA", "v1.3201", 0x55, 0x58, {0x9e, 0x00}, 0}, 253 {"Packard Bell", "DOTMA", "v1.3302", 0x55, 0x58, {0x9e, 0x00}, 0}, 254 {"Packard Bell", "DOTMA", "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0}, 255 {"Packard Bell", "DOTVR46", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0}, 256 /* pewpew-terminator */ 257 {"", "", "", 0, 0, {0, 0}, 0} 258 }; 259 260 /* 261 * this struct is used to instruct thermal layer to use bang_bang instead of 262 * default governor for acerhdf 263 */ 264 static struct thermal_zone_params acerhdf_zone_params = { 265 .governor_name = "bang_bang", 266 }; 267 268 static int acerhdf_get_temp(int *temp) 269 { 270 u8 read_temp; 271 272 if (ec_read(ctrl_cfg.tempreg, &read_temp)) 273 return -EINVAL; 274 275 *temp = read_temp * 1000; 276 277 return 0; 278 } 279 280 static int acerhdf_get_fanstate(int *state) 281 { 282 u8 fan; 283 284 if (ec_read(ctrl_cfg.fanreg, &fan)) 285 return -EINVAL; 286 287 if (fan != ctrl_cfg.cmd.cmd_off) 288 *state = ACERHDF_FAN_AUTO; 289 else 290 *state = ACERHDF_FAN_OFF; 291 292 return 0; 293 } 294 295 static void acerhdf_change_fanstate(int state) 296 { 297 unsigned char cmd; 298 299 if (verbose) 300 pr_notice("fan %s\n", state == ACERHDF_FAN_OFF ? "OFF" : "ON"); 301 302 if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) { 303 pr_err("invalid fan state %d requested, setting to auto!\n", 304 state); 305 state = ACERHDF_FAN_AUTO; 306 } 307 308 cmd = (state == ACERHDF_FAN_OFF) ? ctrl_cfg.cmd.cmd_off 309 : ctrl_cfg.cmd.cmd_auto; 310 fanstate = state; 311 312 ec_write(ctrl_cfg.fanreg, cmd); 313 314 if (ctrl_cfg.mcmd_enable && state == ACERHDF_FAN_OFF) { 315 if (verbose) 316 pr_notice("turning off fan manually\n"); 317 ec_write(mcmd.mreg, mcmd.moff); 318 } 319 } 320 321 static void acerhdf_check_param(struct thermal_zone_device *thermal) 322 { 323 if (fanon > ACERHDF_MAX_FANON) { 324 pr_err("fanon temperature too high, set to %d\n", 325 ACERHDF_MAX_FANON); 326 fanon = ACERHDF_MAX_FANON; 327 } 328 329 if (kernelmode && prev_interval != interval) { 330 if (interval > ACERHDF_MAX_INTERVAL) { 331 pr_err("interval too high, set to %d\n", 332 ACERHDF_MAX_INTERVAL); 333 interval = ACERHDF_MAX_INTERVAL; 334 } 335 if (verbose) 336 pr_notice("interval changed to: %d\n", interval); 337 338 if (thermal) 339 thermal->polling_delay = interval*1000; 340 341 prev_interval = interval; 342 } 343 } 344 345 /* 346 * This is the thermal zone callback which does the delayed polling of the fan 347 * state. We do check /sysfs-originating settings here in acerhdf_check_param() 348 * as late as the polling interval is since we can't do that in the respective 349 * accessors of the module parameters. 350 */ 351 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, int *t) 352 { 353 int temp, err = 0; 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; 399 400 pr_notice("kernel mode fan control OFF\n"); 401 } 402 static inline void acerhdf_enable_kernelmode(void) 403 { 404 kernelmode = 1; 405 406 pr_notice("kernel mode fan control ON\n"); 407 } 408 409 /* 410 * set operation mode; 411 * enabled: the thermal layer of the kernel takes care about 412 * the temperature and the fan. 413 * disabled: the BIOS takes control of the fan. 414 */ 415 static int acerhdf_change_mode(struct thermal_zone_device *thermal, 416 enum thermal_device_mode mode) 417 { 418 if (mode == THERMAL_DEVICE_DISABLED && kernelmode) 419 acerhdf_revert_to_bios_mode(); 420 else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode) 421 acerhdf_enable_kernelmode(); 422 423 return 0; 424 } 425 426 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip, 427 enum thermal_trip_type *type) 428 { 429 if (trip == 0) 430 *type = THERMAL_TRIP_ACTIVE; 431 else if (trip == 1) 432 *type = THERMAL_TRIP_CRITICAL; 433 else 434 return -EINVAL; 435 436 return 0; 437 } 438 439 static int acerhdf_get_trip_hyst(struct thermal_zone_device *thermal, int trip, 440 int *temp) 441 { 442 if (trip != 0) 443 return -EINVAL; 444 445 *temp = fanon - fanoff; 446 447 return 0; 448 } 449 450 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip, 451 int *temp) 452 { 453 if (trip == 0) 454 *temp = fanon; 455 else if (trip == 1) 456 *temp = ACERHDF_TEMP_CRIT; 457 else 458 return -EINVAL; 459 460 return 0; 461 } 462 463 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal, 464 int *temperature) 465 { 466 *temperature = ACERHDF_TEMP_CRIT; 467 return 0; 468 } 469 470 /* bind callback functions to thermalzone */ 471 static struct thermal_zone_device_ops acerhdf_dev_ops = { 472 .bind = acerhdf_bind, 473 .unbind = acerhdf_unbind, 474 .get_temp = acerhdf_get_ec_temp, 475 .change_mode = acerhdf_change_mode, 476 .get_trip_type = acerhdf_get_trip_type, 477 .get_trip_hyst = acerhdf_get_trip_hyst, 478 .get_trip_temp = acerhdf_get_trip_temp, 479 .get_crit_temp = acerhdf_get_crit_temp, 480 }; 481 482 483 /* 484 * cooling device callback functions 485 * get maximal fan cooling state 486 */ 487 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev, 488 unsigned long *state) 489 { 490 *state = 1; 491 492 return 0; 493 } 494 495 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev, 496 unsigned long *state) 497 { 498 int err = 0, tmp; 499 500 err = acerhdf_get_fanstate(&tmp); 501 if (err) 502 return err; 503 504 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0; 505 return 0; 506 } 507 508 /* change current fan state - is overwritten when running in kernel mode */ 509 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev, 510 unsigned long state) 511 { 512 int cur_temp, cur_state, err = 0; 513 514 if (!kernelmode) 515 return 0; 516 517 err = acerhdf_get_temp(&cur_temp); 518 if (err) { 519 pr_err("error reading temperature, hand off control to BIOS\n"); 520 goto err_out; 521 } 522 523 err = acerhdf_get_fanstate(&cur_state); 524 if (err) { 525 pr_err("error reading fan state, hand off control to BIOS\n"); 526 goto err_out; 527 } 528 529 if (state == 0) { 530 if (cur_state == ACERHDF_FAN_AUTO) 531 acerhdf_change_fanstate(ACERHDF_FAN_OFF); 532 } else { 533 if (cur_state == ACERHDF_FAN_OFF) 534 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 535 } 536 return 0; 537 538 err_out: 539 acerhdf_revert_to_bios_mode(); 540 return -EINVAL; 541 } 542 543 /* bind fan callbacks to fan device */ 544 static const struct thermal_cooling_device_ops acerhdf_cooling_ops = { 545 .get_max_state = acerhdf_get_max_state, 546 .get_cur_state = acerhdf_get_cur_state, 547 .set_cur_state = acerhdf_set_cur_state, 548 }; 549 550 /* suspend / resume functionality */ 551 static int acerhdf_suspend(struct device *dev) 552 { 553 if (kernelmode) 554 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 555 556 if (verbose) 557 pr_notice("going suspend\n"); 558 559 return 0; 560 } 561 562 static int acerhdf_probe(struct platform_device *device) 563 { 564 return 0; 565 } 566 567 static int acerhdf_remove(struct platform_device *device) 568 { 569 return 0; 570 } 571 572 static const struct dev_pm_ops acerhdf_pm_ops = { 573 .suspend = acerhdf_suspend, 574 .freeze = acerhdf_suspend, 575 }; 576 577 static struct platform_driver acerhdf_driver = { 578 .driver = { 579 .name = "acerhdf", 580 .pm = &acerhdf_pm_ops, 581 }, 582 .probe = acerhdf_probe, 583 .remove = acerhdf_remove, 584 }; 585 586 /* checks if str begins with start */ 587 static int str_starts_with(const char *str, const char *start) 588 { 589 unsigned long str_len = 0, start_len = 0; 590 591 str_len = strlen(str); 592 start_len = strlen(start); 593 594 if (str_len >= start_len && 595 !strncmp(str, start, start_len)) 596 return 1; 597 598 return 0; 599 } 600 601 /* check hardware */ 602 static int __init acerhdf_check_hardware(void) 603 { 604 char const *vendor, *version, *product; 605 const struct bios_settings *bt = NULL; 606 int found = 0; 607 608 /* get BIOS data */ 609 vendor = dmi_get_system_info(DMI_SYS_VENDOR); 610 version = dmi_get_system_info(DMI_BIOS_VERSION); 611 product = dmi_get_system_info(DMI_PRODUCT_NAME); 612 613 if (!vendor || !version || !product) { 614 pr_err("error getting hardware information\n"); 615 return -EINVAL; 616 } 617 618 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER); 619 620 if (list_supported) { 621 pr_info("List of supported Manufacturer/Model/BIOS:\n"); 622 pr_info("---------------------------------------------------\n"); 623 for (bt = bios_tbl; bt->vendor[0]; bt++) { 624 pr_info("%-13s | %-17s | %-10s\n", bt->vendor, 625 bt->product, bt->version); 626 } 627 pr_info("---------------------------------------------------\n"); 628 return -ECANCELED; 629 } 630 631 if (force_bios[0]) { 632 version = force_bios; 633 pr_info("forcing BIOS version: %s\n", version); 634 kernelmode = 0; 635 } 636 637 if (force_product[0]) { 638 product = force_product; 639 pr_info("forcing BIOS product: %s\n", product); 640 kernelmode = 0; 641 } 642 643 if (verbose) 644 pr_info("BIOS info: %s %s, product: %s\n", 645 vendor, version, product); 646 647 /* search BIOS version and vendor in BIOS settings table */ 648 for (bt = bios_tbl; bt->vendor[0]; bt++) { 649 /* 650 * check if actual hardware BIOS vendor, product and version 651 * IDs start with the strings of BIOS table entry 652 */ 653 if (str_starts_with(vendor, bt->vendor) && 654 str_starts_with(product, bt->product) && 655 str_starts_with(version, bt->version)) { 656 found = 1; 657 break; 658 } 659 } 660 661 if (!found) { 662 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n", 663 vendor, product, version); 664 return -EINVAL; 665 } 666 667 /* Copy control settings from BIOS table before we free it. */ 668 ctrl_cfg.fanreg = bt->fanreg; 669 ctrl_cfg.tempreg = bt->tempreg; 670 memcpy(&ctrl_cfg.cmd, &bt->cmd, sizeof(struct fancmd)); 671 ctrl_cfg.mcmd_enable = bt->mcmd_enable; 672 673 /* 674 * if started with kernel mode off, prevent the kernel from switching 675 * off the fan 676 */ 677 if (!kernelmode) { 678 pr_notice("Fan control off, to enable do:\n"); 679 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zoneN/mode # N=0,1,2...\n"); 680 } 681 682 return 0; 683 } 684 685 static int __init acerhdf_register_platform(void) 686 { 687 int err = 0; 688 689 err = platform_driver_register(&acerhdf_driver); 690 if (err) 691 return err; 692 693 acerhdf_dev = platform_device_alloc("acerhdf", -1); 694 if (!acerhdf_dev) { 695 err = -ENOMEM; 696 goto err_device_alloc; 697 } 698 err = platform_device_add(acerhdf_dev); 699 if (err) 700 goto err_device_add; 701 702 return 0; 703 704 err_device_add: 705 platform_device_put(acerhdf_dev); 706 err_device_alloc: 707 platform_driver_unregister(&acerhdf_driver); 708 return err; 709 } 710 711 static void acerhdf_unregister_platform(void) 712 { 713 platform_device_unregister(acerhdf_dev); 714 platform_driver_unregister(&acerhdf_driver); 715 } 716 717 static int __init acerhdf_register_thermal(void) 718 { 719 int ret; 720 721 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL, 722 &acerhdf_cooling_ops); 723 724 if (IS_ERR(cl_dev)) 725 return -EINVAL; 726 727 thz_dev = thermal_zone_device_register("acerhdf", 2, 0, NULL, 728 &acerhdf_dev_ops, 729 &acerhdf_zone_params, 0, 730 (kernelmode) ? interval*1000 : 0); 731 if (IS_ERR(thz_dev)) 732 return -EINVAL; 733 734 if (kernelmode) 735 ret = thermal_zone_device_enable(thz_dev); 736 else 737 ret = thermal_zone_device_disable(thz_dev); 738 if (ret) 739 return ret; 740 741 if (strcmp(thz_dev->governor->name, 742 acerhdf_zone_params.governor_name)) { 743 pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n", 744 acerhdf_zone_params.governor_name); 745 return -EINVAL; 746 } 747 748 return 0; 749 } 750 751 static void acerhdf_unregister_thermal(void) 752 { 753 if (cl_dev) { 754 thermal_cooling_device_unregister(cl_dev); 755 cl_dev = NULL; 756 } 757 758 if (thz_dev) { 759 thermal_zone_device_unregister(thz_dev); 760 thz_dev = NULL; 761 } 762 } 763 764 static int __init acerhdf_init(void) 765 { 766 int err = 0; 767 768 err = acerhdf_check_hardware(); 769 if (err) 770 goto out_err; 771 772 err = acerhdf_register_platform(); 773 if (err) 774 goto out_err; 775 776 err = acerhdf_register_thermal(); 777 if (err) 778 goto err_unreg; 779 780 return 0; 781 782 err_unreg: 783 acerhdf_unregister_thermal(); 784 acerhdf_unregister_platform(); 785 786 out_err: 787 return err; 788 } 789 790 static void __exit acerhdf_exit(void) 791 { 792 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 793 acerhdf_unregister_thermal(); 794 acerhdf_unregister_platform(); 795 } 796 797 MODULE_LICENSE("GPL"); 798 MODULE_AUTHOR("Peter Kaestle"); 799 MODULE_DESCRIPTION("Aspire One temperature and fan driver"); 800 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:"); 801 MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:"); 802 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:"); 803 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:"); 804 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5755G:"); 805 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:"); 806 MODULE_ALIAS("dmi:*:*Acer*:pnAO521*:"); 807 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:"); 808 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5739G:"); 809 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*One*753:"); 810 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5315:"); 811 MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:"); 812 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*7551:"); 813 MODULE_ALIAS("dmi:*:*Acer*:TM8573T:"); 814 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:"); 815 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:"); 816 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:"); 817 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:"); 818 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:"); 819 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:"); 820 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:"); 821 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:"); 822 MODULE_ALIAS("dmi:*:*Acer*:pnExtensa*5420*:"); 823 824 module_init(acerhdf_init); 825 module_exit(acerhdf_exit); 826 827 static int interval_set_uint(const char *val, const struct kernel_param *kp) 828 { 829 int ret; 830 831 ret = param_set_uint(val, kp); 832 if (ret) 833 return ret; 834 835 acerhdf_check_param(thz_dev); 836 837 return 0; 838 } 839 840 static const struct kernel_param_ops interval_ops = { 841 .set = interval_set_uint, 842 .get = param_get_uint, 843 }; 844 845 module_param_cb(interval, &interval_ops, &interval, 0600); 846 MODULE_PARM_DESC(interval, "Polling interval of temperature check"); 847