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->mode = THERMAL_DEVICE_DISABLED; 402 thz_dev->polling_delay = 0; 403 } 404 pr_notice("kernel mode fan control OFF\n"); 405 } 406 static inline void acerhdf_enable_kernelmode(void) 407 { 408 kernelmode = 1; 409 thz_dev->mode = THERMAL_DEVICE_ENABLED; 410 411 thz_dev->polling_delay = interval*1000; 412 thermal_zone_device_update(thz_dev, THERMAL_EVENT_UNSPECIFIED); 413 pr_notice("kernel mode fan control ON\n"); 414 } 415 416 static int acerhdf_get_mode(struct thermal_zone_device *thermal, 417 enum thermal_device_mode *mode) 418 { 419 if (verbose) 420 pr_notice("kernel mode fan control %d\n", kernelmode); 421 422 *mode = thermal->mode; 423 424 return 0; 425 } 426 427 /* 428 * set operation mode; 429 * enabled: the thermal layer of the kernel takes care about 430 * the temperature and the fan. 431 * disabled: the BIOS takes control of the fan. 432 */ 433 static int acerhdf_set_mode(struct thermal_zone_device *thermal, 434 enum thermal_device_mode mode) 435 { 436 if (mode == THERMAL_DEVICE_DISABLED && kernelmode) 437 acerhdf_revert_to_bios_mode(); 438 else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode) 439 acerhdf_enable_kernelmode(); 440 441 return 0; 442 } 443 444 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip, 445 enum thermal_trip_type *type) 446 { 447 if (trip == 0) 448 *type = THERMAL_TRIP_ACTIVE; 449 else if (trip == 1) 450 *type = THERMAL_TRIP_CRITICAL; 451 else 452 return -EINVAL; 453 454 return 0; 455 } 456 457 static int acerhdf_get_trip_hyst(struct thermal_zone_device *thermal, int trip, 458 int *temp) 459 { 460 if (trip != 0) 461 return -EINVAL; 462 463 *temp = fanon - fanoff; 464 465 return 0; 466 } 467 468 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip, 469 int *temp) 470 { 471 if (trip == 0) 472 *temp = fanon; 473 else if (trip == 1) 474 *temp = ACERHDF_TEMP_CRIT; 475 else 476 return -EINVAL; 477 478 return 0; 479 } 480 481 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal, 482 int *temperature) 483 { 484 *temperature = ACERHDF_TEMP_CRIT; 485 return 0; 486 } 487 488 /* bind callback functions to thermalzone */ 489 static struct thermal_zone_device_ops acerhdf_dev_ops = { 490 .bind = acerhdf_bind, 491 .unbind = acerhdf_unbind, 492 .get_temp = acerhdf_get_ec_temp, 493 .get_mode = acerhdf_get_mode, 494 .set_mode = acerhdf_set_mode, 495 .get_trip_type = acerhdf_get_trip_type, 496 .get_trip_hyst = acerhdf_get_trip_hyst, 497 .get_trip_temp = acerhdf_get_trip_temp, 498 .get_crit_temp = acerhdf_get_crit_temp, 499 }; 500 501 502 /* 503 * cooling device callback functions 504 * get maximal fan cooling state 505 */ 506 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev, 507 unsigned long *state) 508 { 509 *state = 1; 510 511 return 0; 512 } 513 514 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev, 515 unsigned long *state) 516 { 517 int err = 0, tmp; 518 519 err = acerhdf_get_fanstate(&tmp); 520 if (err) 521 return err; 522 523 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0; 524 return 0; 525 } 526 527 /* change current fan state - is overwritten when running in kernel mode */ 528 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev, 529 unsigned long state) 530 { 531 int cur_temp, cur_state, err = 0; 532 533 if (!kernelmode) 534 return 0; 535 536 err = acerhdf_get_temp(&cur_temp); 537 if (err) { 538 pr_err("error reading temperature, hand off control to BIOS\n"); 539 goto err_out; 540 } 541 542 err = acerhdf_get_fanstate(&cur_state); 543 if (err) { 544 pr_err("error reading fan state, hand off control to BIOS\n"); 545 goto err_out; 546 } 547 548 if (state == 0) { 549 if (cur_state == ACERHDF_FAN_AUTO) 550 acerhdf_change_fanstate(ACERHDF_FAN_OFF); 551 } else { 552 if (cur_state == ACERHDF_FAN_OFF) 553 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 554 } 555 return 0; 556 557 err_out: 558 acerhdf_revert_to_bios_mode(); 559 return -EINVAL; 560 } 561 562 /* bind fan callbacks to fan device */ 563 static const struct thermal_cooling_device_ops acerhdf_cooling_ops = { 564 .get_max_state = acerhdf_get_max_state, 565 .get_cur_state = acerhdf_get_cur_state, 566 .set_cur_state = acerhdf_set_cur_state, 567 }; 568 569 /* suspend / resume functionality */ 570 static int acerhdf_suspend(struct device *dev) 571 { 572 if (kernelmode) 573 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 574 575 if (verbose) 576 pr_notice("going suspend\n"); 577 578 return 0; 579 } 580 581 static int acerhdf_probe(struct platform_device *device) 582 { 583 return 0; 584 } 585 586 static int acerhdf_remove(struct platform_device *device) 587 { 588 return 0; 589 } 590 591 static const struct dev_pm_ops acerhdf_pm_ops = { 592 .suspend = acerhdf_suspend, 593 .freeze = acerhdf_suspend, 594 }; 595 596 static struct platform_driver acerhdf_driver = { 597 .driver = { 598 .name = "acerhdf", 599 .pm = &acerhdf_pm_ops, 600 }, 601 .probe = acerhdf_probe, 602 .remove = acerhdf_remove, 603 }; 604 605 /* checks if str begins with start */ 606 static int str_starts_with(const char *str, const char *start) 607 { 608 unsigned long str_len = 0, start_len = 0; 609 610 str_len = strlen(str); 611 start_len = strlen(start); 612 613 if (str_len >= start_len && 614 !strncmp(str, start, start_len)) 615 return 1; 616 617 return 0; 618 } 619 620 /* check hardware */ 621 static int __init acerhdf_check_hardware(void) 622 { 623 char const *vendor, *version, *product; 624 const struct bios_settings *bt = NULL; 625 int found = 0; 626 627 /* get BIOS data */ 628 vendor = dmi_get_system_info(DMI_SYS_VENDOR); 629 version = dmi_get_system_info(DMI_BIOS_VERSION); 630 product = dmi_get_system_info(DMI_PRODUCT_NAME); 631 632 if (!vendor || !version || !product) { 633 pr_err("error getting hardware information\n"); 634 return -EINVAL; 635 } 636 637 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER); 638 639 if (list_supported) { 640 pr_info("List of supported Manufacturer/Model/BIOS:\n"); 641 pr_info("---------------------------------------------------\n"); 642 for (bt = bios_tbl; bt->vendor[0]; bt++) { 643 pr_info("%-13s | %-17s | %-10s\n", bt->vendor, 644 bt->product, bt->version); 645 } 646 pr_info("---------------------------------------------------\n"); 647 return -ECANCELED; 648 } 649 650 if (force_bios[0]) { 651 version = force_bios; 652 pr_info("forcing BIOS version: %s\n", version); 653 kernelmode = 0; 654 } 655 656 if (force_product[0]) { 657 product = force_product; 658 pr_info("forcing BIOS product: %s\n", product); 659 kernelmode = 0; 660 } 661 662 if (verbose) 663 pr_info("BIOS info: %s %s, product: %s\n", 664 vendor, version, product); 665 666 /* search BIOS version and vendor in BIOS settings table */ 667 for (bt = bios_tbl; bt->vendor[0]; bt++) { 668 /* 669 * check if actual hardware BIOS vendor, product and version 670 * IDs start with the strings of BIOS table entry 671 */ 672 if (str_starts_with(vendor, bt->vendor) && 673 str_starts_with(product, bt->product) && 674 str_starts_with(version, bt->version)) { 675 found = 1; 676 break; 677 } 678 } 679 680 if (!found) { 681 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n", 682 vendor, product, version); 683 return -EINVAL; 684 } 685 686 /* Copy control settings from BIOS table before we free it. */ 687 ctrl_cfg.fanreg = bt->fanreg; 688 ctrl_cfg.tempreg = bt->tempreg; 689 memcpy(&ctrl_cfg.cmd, &bt->cmd, sizeof(struct fancmd)); 690 ctrl_cfg.mcmd_enable = bt->mcmd_enable; 691 692 /* 693 * if started with kernel mode off, prevent the kernel from switching 694 * off the fan 695 */ 696 if (!kernelmode) { 697 pr_notice("Fan control off, to enable do:\n"); 698 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zoneN/mode # N=0,1,2...\n"); 699 } 700 701 return 0; 702 } 703 704 static int __init acerhdf_register_platform(void) 705 { 706 int err = 0; 707 708 err = platform_driver_register(&acerhdf_driver); 709 if (err) 710 return err; 711 712 acerhdf_dev = platform_device_alloc("acerhdf", -1); 713 if (!acerhdf_dev) { 714 err = -ENOMEM; 715 goto err_device_alloc; 716 } 717 err = platform_device_add(acerhdf_dev); 718 if (err) 719 goto err_device_add; 720 721 return 0; 722 723 err_device_add: 724 platform_device_put(acerhdf_dev); 725 err_device_alloc: 726 platform_driver_unregister(&acerhdf_driver); 727 return err; 728 } 729 730 static void acerhdf_unregister_platform(void) 731 { 732 platform_device_unregister(acerhdf_dev); 733 platform_driver_unregister(&acerhdf_driver); 734 } 735 736 static int __init acerhdf_register_thermal(void) 737 { 738 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL, 739 &acerhdf_cooling_ops); 740 741 if (IS_ERR(cl_dev)) 742 return -EINVAL; 743 744 thz_dev = thermal_zone_device_register("acerhdf", 2, 0, NULL, 745 &acerhdf_dev_ops, 746 &acerhdf_zone_params, 0, 747 (kernelmode) ? interval*1000 : 0); 748 if (IS_ERR(thz_dev)) 749 return -EINVAL; 750 751 thz_dev->mode = kernelmode ? 752 THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED; 753 754 if (strcmp(thz_dev->governor->name, 755 acerhdf_zone_params.governor_name)) { 756 pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n", 757 acerhdf_zone_params.governor_name); 758 return -EINVAL; 759 } 760 761 return 0; 762 } 763 764 static void acerhdf_unregister_thermal(void) 765 { 766 if (cl_dev) { 767 thermal_cooling_device_unregister(cl_dev); 768 cl_dev = NULL; 769 } 770 771 if (thz_dev) { 772 thermal_zone_device_unregister(thz_dev); 773 thz_dev = NULL; 774 } 775 } 776 777 static int __init acerhdf_init(void) 778 { 779 int err = 0; 780 781 err = acerhdf_check_hardware(); 782 if (err) 783 goto out_err; 784 785 err = acerhdf_register_platform(); 786 if (err) 787 goto out_err; 788 789 err = acerhdf_register_thermal(); 790 if (err) 791 goto err_unreg; 792 793 return 0; 794 795 err_unreg: 796 acerhdf_unregister_thermal(); 797 acerhdf_unregister_platform(); 798 799 out_err: 800 return err; 801 } 802 803 static void __exit acerhdf_exit(void) 804 { 805 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 806 acerhdf_unregister_thermal(); 807 acerhdf_unregister_platform(); 808 } 809 810 MODULE_LICENSE("GPL"); 811 MODULE_AUTHOR("Peter Kaestle"); 812 MODULE_DESCRIPTION("Aspire One temperature and fan driver"); 813 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:"); 814 MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:"); 815 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:"); 816 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:"); 817 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5755G:"); 818 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:"); 819 MODULE_ALIAS("dmi:*:*Acer*:pnAO521*:"); 820 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:"); 821 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5739G:"); 822 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*One*753:"); 823 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5315:"); 824 MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:"); 825 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*7551:"); 826 MODULE_ALIAS("dmi:*:*Acer*:TM8573T:"); 827 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:"); 828 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:"); 829 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:"); 830 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:"); 831 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:"); 832 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:"); 833 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:"); 834 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:"); 835 MODULE_ALIAS("dmi:*:*Acer*:pnExtensa*5420*:"); 836 837 module_init(acerhdf_init); 838 module_exit(acerhdf_exit); 839