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_jiffies = 340 round_jiffies(msecs_to_jiffies(interval * 1000)); 341 342 prev_interval = interval; 343 } 344 } 345 346 /* 347 * This is the thermal zone callback which does the delayed polling of the fan 348 * state. We do check /sysfs-originating settings here in acerhdf_check_param() 349 * as late as the polling interval is since we can't do that in the respective 350 * accessors of the module parameters. 351 */ 352 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, int *t) 353 { 354 int temp, err = 0; 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; 400 401 pr_notice("kernel mode fan control OFF\n"); 402 } 403 static inline void acerhdf_enable_kernelmode(void) 404 { 405 kernelmode = 1; 406 407 pr_notice("kernel mode fan control ON\n"); 408 } 409 410 /* 411 * set operation mode; 412 * enabled: the thermal layer of the kernel takes care about 413 * the temperature and the fan. 414 * disabled: the BIOS takes control of the fan. 415 */ 416 static int acerhdf_change_mode(struct thermal_zone_device *thermal, 417 enum thermal_device_mode mode) 418 { 419 if (mode == THERMAL_DEVICE_DISABLED && kernelmode) 420 acerhdf_revert_to_bios_mode(); 421 else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode) 422 acerhdf_enable_kernelmode(); 423 424 return 0; 425 } 426 427 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip, 428 enum thermal_trip_type *type) 429 { 430 if (trip == 0) 431 *type = THERMAL_TRIP_ACTIVE; 432 else if (trip == 1) 433 *type = THERMAL_TRIP_CRITICAL; 434 else 435 return -EINVAL; 436 437 return 0; 438 } 439 440 static int acerhdf_get_trip_hyst(struct thermal_zone_device *thermal, int trip, 441 int *temp) 442 { 443 if (trip != 0) 444 return -EINVAL; 445 446 *temp = fanon - fanoff; 447 448 return 0; 449 } 450 451 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip, 452 int *temp) 453 { 454 if (trip == 0) 455 *temp = fanon; 456 else if (trip == 1) 457 *temp = ACERHDF_TEMP_CRIT; 458 else 459 return -EINVAL; 460 461 return 0; 462 } 463 464 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal, 465 int *temperature) 466 { 467 *temperature = ACERHDF_TEMP_CRIT; 468 return 0; 469 } 470 471 /* bind callback functions to thermalzone */ 472 static struct thermal_zone_device_ops acerhdf_dev_ops = { 473 .bind = acerhdf_bind, 474 .unbind = acerhdf_unbind, 475 .get_temp = acerhdf_get_ec_temp, 476 .change_mode = acerhdf_change_mode, 477 .get_trip_type = acerhdf_get_trip_type, 478 .get_trip_hyst = acerhdf_get_trip_hyst, 479 .get_trip_temp = acerhdf_get_trip_temp, 480 .get_crit_temp = acerhdf_get_crit_temp, 481 }; 482 483 484 /* 485 * cooling device callback functions 486 * get maximal fan cooling state 487 */ 488 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev, 489 unsigned long *state) 490 { 491 *state = 1; 492 493 return 0; 494 } 495 496 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev, 497 unsigned long *state) 498 { 499 int err = 0, tmp; 500 501 err = acerhdf_get_fanstate(&tmp); 502 if (err) 503 return err; 504 505 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0; 506 return 0; 507 } 508 509 /* change current fan state - is overwritten when running in kernel mode */ 510 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev, 511 unsigned long state) 512 { 513 int cur_temp, cur_state, err = 0; 514 515 if (!kernelmode) 516 return 0; 517 518 err = acerhdf_get_temp(&cur_temp); 519 if (err) { 520 pr_err("error reading temperature, hand off control to BIOS\n"); 521 goto err_out; 522 } 523 524 err = acerhdf_get_fanstate(&cur_state); 525 if (err) { 526 pr_err("error reading fan state, hand off control to BIOS\n"); 527 goto err_out; 528 } 529 530 if (state == 0) { 531 if (cur_state == ACERHDF_FAN_AUTO) 532 acerhdf_change_fanstate(ACERHDF_FAN_OFF); 533 } else { 534 if (cur_state == ACERHDF_FAN_OFF) 535 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 536 } 537 return 0; 538 539 err_out: 540 acerhdf_revert_to_bios_mode(); 541 return -EINVAL; 542 } 543 544 /* bind fan callbacks to fan device */ 545 static const struct thermal_cooling_device_ops acerhdf_cooling_ops = { 546 .get_max_state = acerhdf_get_max_state, 547 .get_cur_state = acerhdf_get_cur_state, 548 .set_cur_state = acerhdf_set_cur_state, 549 }; 550 551 /* suspend / resume functionality */ 552 static int acerhdf_suspend(struct device *dev) 553 { 554 if (kernelmode) 555 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 556 557 if (verbose) 558 pr_notice("going suspend\n"); 559 560 return 0; 561 } 562 563 static int acerhdf_probe(struct platform_device *device) 564 { 565 return 0; 566 } 567 568 static int acerhdf_remove(struct platform_device *device) 569 { 570 return 0; 571 } 572 573 static const struct dev_pm_ops acerhdf_pm_ops = { 574 .suspend = acerhdf_suspend, 575 .freeze = acerhdf_suspend, 576 }; 577 578 static struct platform_driver acerhdf_driver = { 579 .driver = { 580 .name = "acerhdf", 581 .pm = &acerhdf_pm_ops, 582 }, 583 .probe = acerhdf_probe, 584 .remove = acerhdf_remove, 585 }; 586 587 /* check hardware */ 588 static int __init acerhdf_check_hardware(void) 589 { 590 char const *vendor, *version, *product; 591 const struct bios_settings *bt = NULL; 592 int found = 0; 593 594 /* get BIOS data */ 595 vendor = dmi_get_system_info(DMI_SYS_VENDOR); 596 version = dmi_get_system_info(DMI_BIOS_VERSION); 597 product = dmi_get_system_info(DMI_PRODUCT_NAME); 598 599 if (!vendor || !version || !product) { 600 pr_err("error getting hardware information\n"); 601 return -EINVAL; 602 } 603 604 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER); 605 606 if (list_supported) { 607 pr_info("List of supported Manufacturer/Model/BIOS:\n"); 608 pr_info("---------------------------------------------------\n"); 609 for (bt = bios_tbl; bt->vendor[0]; bt++) { 610 pr_info("%-13s | %-17s | %-10s\n", bt->vendor, 611 bt->product, bt->version); 612 } 613 pr_info("---------------------------------------------------\n"); 614 return -ECANCELED; 615 } 616 617 if (force_bios[0]) { 618 version = force_bios; 619 pr_info("forcing BIOS version: %s\n", version); 620 kernelmode = 0; 621 } 622 623 if (force_product[0]) { 624 product = force_product; 625 pr_info("forcing BIOS product: %s\n", product); 626 kernelmode = 0; 627 } 628 629 if (verbose) 630 pr_info("BIOS info: %s %s, product: %s\n", 631 vendor, version, product); 632 633 /* search BIOS version and vendor in BIOS settings table */ 634 for (bt = bios_tbl; bt->vendor[0]; bt++) { 635 /* 636 * check if actual hardware BIOS vendor, product and version 637 * IDs start with the strings of BIOS table entry 638 */ 639 if (strstarts(vendor, bt->vendor) && 640 strstarts(product, bt->product) && 641 strstarts(version, bt->version)) { 642 found = 1; 643 break; 644 } 645 } 646 647 if (!found) { 648 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n", 649 vendor, product, version); 650 return -EINVAL; 651 } 652 653 /* Copy control settings from BIOS table before we free it. */ 654 ctrl_cfg.fanreg = bt->fanreg; 655 ctrl_cfg.tempreg = bt->tempreg; 656 memcpy(&ctrl_cfg.cmd, &bt->cmd, sizeof(struct fancmd)); 657 ctrl_cfg.mcmd_enable = bt->mcmd_enable; 658 659 /* 660 * if started with kernel mode off, prevent the kernel from switching 661 * off the fan 662 */ 663 if (!kernelmode) { 664 pr_notice("Fan control off, to enable do:\n"); 665 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zoneN/mode # N=0,1,2...\n"); 666 } 667 668 return 0; 669 } 670 671 static int __init acerhdf_register_platform(void) 672 { 673 int err = 0; 674 675 err = platform_driver_register(&acerhdf_driver); 676 if (err) 677 return err; 678 679 acerhdf_dev = platform_device_alloc("acerhdf", -1); 680 if (!acerhdf_dev) { 681 err = -ENOMEM; 682 goto err_device_alloc; 683 } 684 err = platform_device_add(acerhdf_dev); 685 if (err) 686 goto err_device_add; 687 688 return 0; 689 690 err_device_add: 691 platform_device_put(acerhdf_dev); 692 err_device_alloc: 693 platform_driver_unregister(&acerhdf_driver); 694 return err; 695 } 696 697 static void acerhdf_unregister_platform(void) 698 { 699 platform_device_unregister(acerhdf_dev); 700 platform_driver_unregister(&acerhdf_driver); 701 } 702 703 static int __init acerhdf_register_thermal(void) 704 { 705 int ret; 706 707 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL, 708 &acerhdf_cooling_ops); 709 710 if (IS_ERR(cl_dev)) 711 return -EINVAL; 712 713 thz_dev = thermal_zone_device_register("acerhdf", 2, 0, NULL, 714 &acerhdf_dev_ops, 715 &acerhdf_zone_params, 0, 716 (kernelmode) ? interval*1000 : 0); 717 if (IS_ERR(thz_dev)) 718 return -EINVAL; 719 720 if (kernelmode) 721 ret = thermal_zone_device_enable(thz_dev); 722 else 723 ret = thermal_zone_device_disable(thz_dev); 724 if (ret) 725 return ret; 726 727 if (strcmp(thz_dev->governor->name, 728 acerhdf_zone_params.governor_name)) { 729 pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n", 730 acerhdf_zone_params.governor_name); 731 return -EINVAL; 732 } 733 734 return 0; 735 } 736 737 static void acerhdf_unregister_thermal(void) 738 { 739 if (cl_dev) { 740 thermal_cooling_device_unregister(cl_dev); 741 cl_dev = NULL; 742 } 743 744 if (thz_dev) { 745 thermal_zone_device_unregister(thz_dev); 746 thz_dev = NULL; 747 } 748 } 749 750 static int __init acerhdf_init(void) 751 { 752 int err = 0; 753 754 err = acerhdf_check_hardware(); 755 if (err) 756 goto out_err; 757 758 err = acerhdf_register_platform(); 759 if (err) 760 goto out_err; 761 762 err = acerhdf_register_thermal(); 763 if (err) 764 goto err_unreg; 765 766 return 0; 767 768 err_unreg: 769 acerhdf_unregister_thermal(); 770 acerhdf_unregister_platform(); 771 772 out_err: 773 return err; 774 } 775 776 static void __exit acerhdf_exit(void) 777 { 778 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 779 acerhdf_unregister_thermal(); 780 acerhdf_unregister_platform(); 781 } 782 783 MODULE_LICENSE("GPL"); 784 MODULE_AUTHOR("Peter Kaestle"); 785 MODULE_DESCRIPTION("Aspire One temperature and fan driver"); 786 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:"); 787 MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:"); 788 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:"); 789 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:"); 790 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5755G:"); 791 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:"); 792 MODULE_ALIAS("dmi:*:*Acer*:pnAO521*:"); 793 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:"); 794 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5739G:"); 795 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*One*753:"); 796 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5315:"); 797 MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:"); 798 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*7551:"); 799 MODULE_ALIAS("dmi:*:*Acer*:TM8573T:"); 800 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:"); 801 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:"); 802 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:"); 803 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:"); 804 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:"); 805 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:"); 806 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:"); 807 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:"); 808 MODULE_ALIAS("dmi:*:*Acer*:pnExtensa*5420*:"); 809 810 module_init(acerhdf_init); 811 module_exit(acerhdf_exit); 812 813 static int interval_set_uint(const char *val, const struct kernel_param *kp) 814 { 815 int ret; 816 817 ret = param_set_uint(val, kp); 818 if (ret) 819 return ret; 820 821 acerhdf_check_param(thz_dev); 822 823 return 0; 824 } 825 826 static const struct kernel_param_ops interval_ops = { 827 .set = interval_set_uint, 828 .get = param_get_uint, 829 }; 830 831 module_param_cb(interval, &interval_ops, &interval, 0600); 832 MODULE_PARM_DESC(interval, "Polling interval of temperature check"); 833