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 69 static int kernelmode = 1; 70 #else 71 static int kernelmode; 72 #endif 73 74 static unsigned int interval = 10; 75 static unsigned int fanon = ACERHDF_DEFAULT_TEMP_FANON; 76 static unsigned int fanoff = ACERHDF_DEFAULT_TEMP_FANOFF; 77 static unsigned int verbose; 78 static unsigned int list_supported; 79 static unsigned int fanstate = ACERHDF_FAN_AUTO; 80 static char force_bios[16]; 81 static char force_product[16]; 82 static struct thermal_zone_device *thz_dev; 83 static struct thermal_cooling_device *cl_dev; 84 static struct platform_device *acerhdf_dev; 85 86 module_param(kernelmode, uint, 0); 87 MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off"); 88 module_param(fanon, uint, 0600); 89 MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature"); 90 module_param(fanoff, uint, 0600); 91 MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature"); 92 module_param(verbose, uint, 0600); 93 MODULE_PARM_DESC(verbose, "Enable verbose dmesg output"); 94 module_param(list_supported, uint, 0600); 95 MODULE_PARM_DESC(list_supported, "List supported models and BIOS versions"); 96 module_param_string(force_bios, force_bios, 16, 0); 97 MODULE_PARM_DESC(force_bios, "Pretend system has this known supported BIOS version"); 98 module_param_string(force_product, force_product, 16, 0); 99 MODULE_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 */ 106 struct fancmd { 107 u8 cmd_off; 108 u8 cmd_auto; 109 }; 110 111 struct manualcmd { 112 u8 mreg; 113 u8 moff; 114 }; 115 116 /* default register and command to disable fan in manual mode */ 117 static const struct manualcmd mcmd = { 118 .mreg = 0x94, 119 .moff = 0xff, 120 }; 121 122 /* BIOS settings - only used during probe */ 123 struct 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 */ 134 struct ctrl_settings { 135 u8 fanreg; 136 u8 tempreg; 137 struct fancmd cmd; 138 int mcmd_enable; 139 }; 140 141 static 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 }; 149 150 static struct ctrl_settings ctrl_cfg __read_mostly; 151 152 /* Register addresses and values for different BIOS versions */ 153 static 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 */ 274 static struct thermal_zone_params acerhdf_zone_params = { 275 .governor_name = "bang_bang", 276 }; 277 278 static 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 } 289 290 static 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 } 304 305 static 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 } 330 331 static 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 */ 366 static 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 } 380 381 static bool acerhdf_should_bind(struct thermal_zone_device *thermal, 382 const struct thermal_trip *trip, 383 struct thermal_cooling_device *cdev, 384 struct cooling_spec *c) 385 { 386 /* if the cooling device is the one from acerhdf bind it */ 387 return cdev == cl_dev && trip->type == THERMAL_TRIP_ACTIVE; 388 } 389 390 static inline void acerhdf_revert_to_bios_mode(void) 391 { 392 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 393 kernelmode = 0; 394 395 pr_notice("kernel mode fan control OFF\n"); 396 } 397 static inline void acerhdf_enable_kernelmode(void) 398 { 399 kernelmode = 1; 400 401 pr_notice("kernel mode fan control ON\n"); 402 } 403 404 /* 405 * set operation mode; 406 * enabled: the thermal layer of the kernel takes care about 407 * the temperature and the fan. 408 * disabled: the BIOS takes control of the fan. 409 */ 410 static int acerhdf_change_mode(struct thermal_zone_device *thermal, 411 enum thermal_device_mode mode) 412 { 413 if (mode == THERMAL_DEVICE_DISABLED && kernelmode) 414 acerhdf_revert_to_bios_mode(); 415 else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode) 416 acerhdf_enable_kernelmode(); 417 418 return 0; 419 } 420 421 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal, 422 int *temperature) 423 { 424 *temperature = ACERHDF_TEMP_CRIT; 425 return 0; 426 } 427 428 /* bind callback functions to thermalzone */ 429 static struct thermal_zone_device_ops acerhdf_dev_ops = { 430 .should_bind = acerhdf_should_bind, 431 .get_temp = acerhdf_get_ec_temp, 432 .change_mode = acerhdf_change_mode, 433 .get_crit_temp = acerhdf_get_crit_temp, 434 }; 435 436 /* 437 * cooling device callback functions 438 * get maximal fan cooling state 439 */ 440 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev, 441 unsigned long *state) 442 { 443 *state = 1; 444 445 return 0; 446 } 447 448 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev, 449 unsigned long *state) 450 { 451 int err = 0, tmp; 452 453 err = acerhdf_get_fanstate(&tmp); 454 if (err) 455 return err; 456 457 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0; 458 return 0; 459 } 460 461 /* change current fan state - is overwritten when running in kernel mode */ 462 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev, 463 unsigned long state) 464 { 465 int cur_temp, cur_state, err = 0; 466 467 if (!kernelmode) 468 return 0; 469 470 err = acerhdf_get_temp(&cur_temp); 471 if (err) { 472 pr_err("error reading temperature, hand off control to BIOS\n"); 473 goto err_out; 474 } 475 476 err = acerhdf_get_fanstate(&cur_state); 477 if (err) { 478 pr_err("error reading fan state, hand off control to BIOS\n"); 479 goto err_out; 480 } 481 482 if (state == 0) { 483 if (cur_state == ACERHDF_FAN_AUTO) 484 acerhdf_change_fanstate(ACERHDF_FAN_OFF); 485 } else { 486 if (cur_state == ACERHDF_FAN_OFF) 487 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 488 } 489 return 0; 490 491 err_out: 492 acerhdf_revert_to_bios_mode(); 493 return -EINVAL; 494 } 495 496 /* bind fan callbacks to fan device */ 497 static const struct thermal_cooling_device_ops acerhdf_cooling_ops = { 498 .get_max_state = acerhdf_get_max_state, 499 .get_cur_state = acerhdf_get_cur_state, 500 .set_cur_state = acerhdf_set_cur_state, 501 }; 502 503 /* suspend / resume functionality */ 504 static int acerhdf_suspend(struct device *dev) 505 { 506 if (kernelmode) 507 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 508 509 if (verbose) 510 pr_notice("going suspend\n"); 511 512 return 0; 513 } 514 515 static int acerhdf_probe(struct platform_device *device) 516 { 517 return 0; 518 } 519 520 static const struct dev_pm_ops acerhdf_pm_ops = { 521 .suspend = acerhdf_suspend, 522 .freeze = acerhdf_suspend, 523 }; 524 525 static struct platform_driver acerhdf_driver = { 526 .driver = { 527 .name = "acerhdf", 528 .pm = &acerhdf_pm_ops, 529 }, 530 .probe = acerhdf_probe, 531 }; 532 533 /* check hardware */ 534 static int __init acerhdf_check_hardware(void) 535 { 536 char const *vendor, *version, *product; 537 const struct bios_settings *bt = NULL; 538 int found = 0; 539 540 /* get BIOS data */ 541 vendor = dmi_get_system_info(DMI_SYS_VENDOR); 542 version = dmi_get_system_info(DMI_BIOS_VERSION); 543 product = dmi_get_system_info(DMI_PRODUCT_NAME); 544 545 if (!vendor || !version || !product) { 546 pr_err("error getting hardware information\n"); 547 return -EINVAL; 548 } 549 550 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER); 551 552 if (list_supported) { 553 pr_info("List of supported Manufacturer/Model/BIOS:\n"); 554 pr_info("---------------------------------------------------\n"); 555 for (bt = bios_tbl; bt->vendor[0]; bt++) { 556 pr_info("%-13s | %-17s | %-10s\n", bt->vendor, 557 bt->product, bt->version); 558 } 559 pr_info("---------------------------------------------------\n"); 560 return -ECANCELED; 561 } 562 563 if (force_bios[0]) { 564 version = force_bios; 565 pr_info("forcing BIOS version: %s\n", version); 566 kernelmode = 0; 567 } 568 569 if (force_product[0]) { 570 product = force_product; 571 pr_info("forcing BIOS product: %s\n", product); 572 kernelmode = 0; 573 } 574 575 if (verbose) 576 pr_info("BIOS info: %s %s, product: %s\n", 577 vendor, version, product); 578 579 /* search BIOS version and vendor in BIOS settings table */ 580 for (bt = bios_tbl; bt->vendor[0]; bt++) { 581 /* 582 * check if actual hardware BIOS vendor, product and version 583 * IDs start with the strings of BIOS table entry 584 */ 585 if (strstarts(vendor, bt->vendor) && 586 strstarts(product, bt->product) && 587 strstarts(version, bt->version)) { 588 found = 1; 589 break; 590 } 591 } 592 593 if (!found) { 594 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n", 595 vendor, product, version); 596 return -EINVAL; 597 } 598 599 /* Copy control settings from BIOS table before we free it. */ 600 ctrl_cfg.fanreg = bt->fanreg; 601 ctrl_cfg.tempreg = bt->tempreg; 602 memcpy(&ctrl_cfg.cmd, &bt->cmd, sizeof(struct fancmd)); 603 ctrl_cfg.mcmd_enable = bt->mcmd_enable; 604 605 /* 606 * if started with kernel mode off, prevent the kernel from switching 607 * off the fan 608 */ 609 if (!kernelmode) { 610 pr_notice("Fan control off, to enable do:\n"); 611 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zoneN/mode # N=0,1,2...\n"); 612 } 613 614 return 0; 615 } 616 617 static int __init acerhdf_register_platform(void) 618 { 619 int err = 0; 620 621 err = platform_driver_register(&acerhdf_driver); 622 if (err) 623 return err; 624 625 acerhdf_dev = platform_device_alloc("acerhdf", PLATFORM_DEVID_NONE); 626 if (!acerhdf_dev) { 627 err = -ENOMEM; 628 goto err_device_alloc; 629 } 630 err = platform_device_add(acerhdf_dev); 631 if (err) 632 goto err_device_add; 633 634 return 0; 635 636 err_device_add: 637 platform_device_put(acerhdf_dev); 638 err_device_alloc: 639 platform_driver_unregister(&acerhdf_driver); 640 return err; 641 } 642 643 static void acerhdf_unregister_platform(void) 644 { 645 platform_device_unregister(acerhdf_dev); 646 platform_driver_unregister(&acerhdf_driver); 647 } 648 649 static int __init acerhdf_register_thermal(void) 650 { 651 int ret; 652 653 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL, 654 &acerhdf_cooling_ops); 655 656 if (IS_ERR(cl_dev)) 657 return -EINVAL; 658 659 thz_dev = thermal_zone_device_register_with_trips("acerhdf", trips, ARRAY_SIZE(trips), 660 NULL, &acerhdf_dev_ops, 661 &acerhdf_zone_params, 0, 662 (kernelmode) ? interval*1000 : 0); 663 if (IS_ERR(thz_dev)) 664 return -EINVAL; 665 666 if (kernelmode) 667 ret = thermal_zone_device_enable(thz_dev); 668 else 669 ret = thermal_zone_device_disable(thz_dev); 670 if (ret) 671 return ret; 672 673 return 0; 674 } 675 676 static void acerhdf_unregister_thermal(void) 677 { 678 if (cl_dev) { 679 thermal_cooling_device_unregister(cl_dev); 680 cl_dev = NULL; 681 } 682 683 if (thz_dev) { 684 thermal_zone_device_unregister(thz_dev); 685 thz_dev = NULL; 686 } 687 } 688 689 static int __init acerhdf_init(void) 690 { 691 int err = 0; 692 693 err = acerhdf_check_hardware(); 694 if (err) 695 goto out_err; 696 697 err = acerhdf_register_platform(); 698 if (err) 699 goto out_err; 700 701 err = acerhdf_register_thermal(); 702 if (err) 703 goto err_unreg; 704 705 return 0; 706 707 err_unreg: 708 acerhdf_unregister_thermal(); 709 acerhdf_unregister_platform(); 710 711 out_err: 712 return err; 713 } 714 715 static void __exit acerhdf_exit(void) 716 { 717 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 718 acerhdf_unregister_thermal(); 719 acerhdf_unregister_platform(); 720 } 721 722 MODULE_LICENSE("GPL"); 723 MODULE_AUTHOR("Peter Kaestle"); 724 MODULE_DESCRIPTION("Aspire One temperature and fan driver"); 725 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:"); 726 MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:"); 727 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:"); 728 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:"); 729 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5755G:"); 730 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:"); 731 MODULE_ALIAS("dmi:*:*Acer*:pnAO521*:"); 732 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:"); 733 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5739G:"); 734 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*One*753:"); 735 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5315:"); 736 MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:"); 737 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*7551:"); 738 MODULE_ALIAS("dmi:*:*Acer*:TM8573T:"); 739 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:"); 740 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:"); 741 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:"); 742 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:"); 743 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:"); 744 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:"); 745 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:"); 746 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:"); 747 MODULE_ALIAS("dmi:*:*Acer*:pnExtensa*5420*:"); 748 749 module_init(acerhdf_init); 750 module_exit(acerhdf_exit); 751 752 static int interval_set_uint(const char *val, const struct kernel_param *kp) 753 { 754 int ret; 755 756 ret = param_set_uint(val, kp); 757 if (ret) 758 return ret; 759 760 acerhdf_check_param(thz_dev); 761 762 return 0; 763 } 764 765 static const struct kernel_param_ops interval_ops = { 766 .set = interval_set_uint, 767 .get = param_get_uint, 768 }; 769 770 module_param_cb(interval, &interval_ops, &interval, 0000); 771 MODULE_PARM_DESC(interval, "Polling interval of temperature check"); 772