1 /* 2 * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $) 3 * 4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 6 * 7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or (at 12 * your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, but 15 * WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License along 20 * with this program; if not, write to the Free Software Foundation, Inc., 21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 22 * 23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 24 * 25 * This driver fully implements the ACPI thermal policy as described in the 26 * ACPI 2.0 Specification. 27 * 28 * TBD: 1. Implement passive cooling hysteresis. 29 * 2. Enhance passive cooling (CPU) states/limit interface to support 30 * concepts of 'multiple limiters', upper/lower limits, etc. 31 * 32 */ 33 34 #include <linux/kernel.h> 35 #include <linux/module.h> 36 #include <linux/dmi.h> 37 #include <linux/init.h> 38 #include <linux/types.h> 39 #include <linux/proc_fs.h> 40 #include <linux/timer.h> 41 #include <linux/jiffies.h> 42 #include <linux/kmod.h> 43 #include <linux/seq_file.h> 44 #include <linux/reboot.h> 45 #include <asm/uaccess.h> 46 #include <linux/thermal.h> 47 #include <acpi/acpi_bus.h> 48 #include <acpi/acpi_drivers.h> 49 50 #define ACPI_THERMAL_COMPONENT 0x04000000 51 #define ACPI_THERMAL_CLASS "thermal_zone" 52 #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone" 53 #define ACPI_THERMAL_FILE_STATE "state" 54 #define ACPI_THERMAL_FILE_TEMPERATURE "temperature" 55 #define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points" 56 #define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode" 57 #define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency" 58 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80 59 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81 60 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82 61 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0 62 #define ACPI_THERMAL_NOTIFY_HOT 0xF1 63 #define ACPI_THERMAL_MODE_ACTIVE 0x00 64 65 #define ACPI_THERMAL_MAX_ACTIVE 10 66 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65 67 68 #define _COMPONENT ACPI_THERMAL_COMPONENT 69 ACPI_MODULE_NAME("thermal"); 70 71 MODULE_AUTHOR("Paul Diefenbaugh"); 72 MODULE_DESCRIPTION("ACPI Thermal Zone Driver"); 73 MODULE_LICENSE("GPL"); 74 75 static int act; 76 module_param(act, int, 0644); 77 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points."); 78 79 static int crt; 80 module_param(crt, int, 0644); 81 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points."); 82 83 static int tzp; 84 module_param(tzp, int, 0444); 85 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds."); 86 87 static int nocrt; 88 module_param(nocrt, int, 0); 89 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points."); 90 91 static int off; 92 module_param(off, int, 0); 93 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support."); 94 95 static int psv; 96 module_param(psv, int, 0644); 97 MODULE_PARM_DESC(psv, "Disable or override all passive trip points."); 98 99 static int acpi_thermal_add(struct acpi_device *device); 100 static int acpi_thermal_remove(struct acpi_device *device, int type); 101 static int acpi_thermal_resume(struct acpi_device *device); 102 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file); 103 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file); 104 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file); 105 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file); 106 static ssize_t acpi_thermal_write_cooling_mode(struct file *, 107 const char __user *, size_t, 108 loff_t *); 109 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file); 110 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *, 111 size_t, loff_t *); 112 113 static const struct acpi_device_id thermal_device_ids[] = { 114 {ACPI_THERMAL_HID, 0}, 115 {"", 0}, 116 }; 117 MODULE_DEVICE_TABLE(acpi, thermal_device_ids); 118 119 static struct acpi_driver acpi_thermal_driver = { 120 .name = "thermal", 121 .class = ACPI_THERMAL_CLASS, 122 .ids = thermal_device_ids, 123 .ops = { 124 .add = acpi_thermal_add, 125 .remove = acpi_thermal_remove, 126 .resume = acpi_thermal_resume, 127 }, 128 }; 129 130 struct acpi_thermal_state { 131 u8 critical:1; 132 u8 hot:1; 133 u8 passive:1; 134 u8 active:1; 135 u8 reserved:4; 136 int active_index; 137 }; 138 139 struct acpi_thermal_state_flags { 140 u8 valid:1; 141 u8 enabled:1; 142 u8 reserved:6; 143 }; 144 145 struct acpi_thermal_critical { 146 struct acpi_thermal_state_flags flags; 147 unsigned long temperature; 148 }; 149 150 struct acpi_thermal_hot { 151 struct acpi_thermal_state_flags flags; 152 unsigned long temperature; 153 }; 154 155 struct acpi_thermal_passive { 156 struct acpi_thermal_state_flags flags; 157 unsigned long temperature; 158 unsigned long tc1; 159 unsigned long tc2; 160 unsigned long tsp; 161 struct acpi_handle_list devices; 162 }; 163 164 struct acpi_thermal_active { 165 struct acpi_thermal_state_flags flags; 166 unsigned long temperature; 167 struct acpi_handle_list devices; 168 }; 169 170 struct acpi_thermal_trips { 171 struct acpi_thermal_critical critical; 172 struct acpi_thermal_hot hot; 173 struct acpi_thermal_passive passive; 174 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE]; 175 }; 176 177 struct acpi_thermal_flags { 178 u8 cooling_mode:1; /* _SCP */ 179 u8 devices:1; /* _TZD */ 180 u8 reserved:6; 181 }; 182 183 struct acpi_thermal { 184 struct acpi_device * device; 185 acpi_bus_id name; 186 unsigned long temperature; 187 unsigned long last_temperature; 188 unsigned long polling_frequency; 189 volatile u8 zombie; 190 struct acpi_thermal_flags flags; 191 struct acpi_thermal_state state; 192 struct acpi_thermal_trips trips; 193 struct acpi_handle_list devices; 194 struct timer_list timer; 195 struct thermal_zone_device *thermal_zone; 196 int tz_enabled; 197 struct mutex lock; 198 }; 199 200 static const struct file_operations acpi_thermal_state_fops = { 201 .owner = THIS_MODULE, 202 .open = acpi_thermal_state_open_fs, 203 .read = seq_read, 204 .llseek = seq_lseek, 205 .release = single_release, 206 }; 207 208 static const struct file_operations acpi_thermal_temp_fops = { 209 .owner = THIS_MODULE, 210 .open = acpi_thermal_temp_open_fs, 211 .read = seq_read, 212 .llseek = seq_lseek, 213 .release = single_release, 214 }; 215 216 static const struct file_operations acpi_thermal_trip_fops = { 217 .owner = THIS_MODULE, 218 .open = acpi_thermal_trip_open_fs, 219 .read = seq_read, 220 .llseek = seq_lseek, 221 .release = single_release, 222 }; 223 224 static const struct file_operations acpi_thermal_cooling_fops = { 225 .owner = THIS_MODULE, 226 .open = acpi_thermal_cooling_open_fs, 227 .read = seq_read, 228 .write = acpi_thermal_write_cooling_mode, 229 .llseek = seq_lseek, 230 .release = single_release, 231 }; 232 233 static const struct file_operations acpi_thermal_polling_fops = { 234 .owner = THIS_MODULE, 235 .open = acpi_thermal_polling_open_fs, 236 .read = seq_read, 237 .write = acpi_thermal_write_polling, 238 .llseek = seq_lseek, 239 .release = single_release, 240 }; 241 242 /* -------------------------------------------------------------------------- 243 Thermal Zone Management 244 -------------------------------------------------------------------------- */ 245 246 static int acpi_thermal_get_temperature(struct acpi_thermal *tz) 247 { 248 acpi_status status = AE_OK; 249 250 251 if (!tz) 252 return -EINVAL; 253 254 tz->last_temperature = tz->temperature; 255 256 status = 257 acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature); 258 if (ACPI_FAILURE(status)) 259 return -ENODEV; 260 261 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n", 262 tz->temperature)); 263 264 return 0; 265 } 266 267 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz) 268 { 269 acpi_status status = AE_OK; 270 271 272 if (!tz) 273 return -EINVAL; 274 275 status = 276 acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, 277 &tz->polling_frequency); 278 if (ACPI_FAILURE(status)) 279 return -ENODEV; 280 281 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n", 282 tz->polling_frequency)); 283 284 return 0; 285 } 286 287 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds) 288 { 289 290 if (!tz) 291 return -EINVAL; 292 293 tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */ 294 295 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 296 "Polling frequency set to %lu seconds\n", 297 tz->polling_frequency/10)); 298 299 return 0; 300 } 301 302 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode) 303 { 304 acpi_status status = AE_OK; 305 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 306 struct acpi_object_list arg_list = { 1, &arg0 }; 307 acpi_handle handle = NULL; 308 309 310 if (!tz) 311 return -EINVAL; 312 313 status = acpi_get_handle(tz->device->handle, "_SCP", &handle); 314 if (ACPI_FAILURE(status)) { 315 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n")); 316 return -ENODEV; 317 } 318 319 arg0.integer.value = mode; 320 321 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL); 322 if (ACPI_FAILURE(status)) 323 return -ENODEV; 324 325 return 0; 326 } 327 328 #define ACPI_TRIPS_CRITICAL 0x01 329 #define ACPI_TRIPS_HOT 0x02 330 #define ACPI_TRIPS_PASSIVE 0x04 331 #define ACPI_TRIPS_ACTIVE 0x08 332 #define ACPI_TRIPS_DEVICES 0x10 333 334 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE) 335 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES 336 337 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \ 338 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \ 339 ACPI_TRIPS_DEVICES) 340 341 /* 342 * This exception is thrown out in two cases: 343 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid 344 * when re-evaluating the AML code. 345 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change. 346 * We need to re-bind the cooling devices of a thermal zone when this occurs. 347 */ 348 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \ 349 do { \ 350 if (flags != ACPI_TRIPS_INIT) \ 351 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \ 352 "ACPI thermal trip point %s changed\n" \ 353 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \ 354 } while (0) 355 356 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag) 357 { 358 acpi_status status = AE_OK; 359 struct acpi_handle_list devices; 360 int valid = 0; 361 int i; 362 363 /* Critical Shutdown (required) */ 364 if (flag & ACPI_TRIPS_CRITICAL) { 365 status = acpi_evaluate_integer(tz->device->handle, 366 "_CRT", NULL, &tz->trips.critical.temperature); 367 /* 368 * Treat freezing temperatures as invalid as well; some 369 * BIOSes return really low values and cause reboots at startup. 370 * Below zero (Celcius) values clearly aren't right for sure.. 371 * ... so lets discard those as invalid. 372 */ 373 if (ACPI_FAILURE(status) || 374 tz->trips.critical.temperature <= 2732) { 375 tz->trips.critical.flags.valid = 0; 376 ACPI_EXCEPTION((AE_INFO, status, 377 "No or invalid critical threshold")); 378 return -ENODEV; 379 } else { 380 tz->trips.critical.flags.valid = 1; 381 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 382 "Found critical threshold [%lu]\n", 383 tz->trips.critical.temperature)); 384 } 385 if (tz->trips.critical.flags.valid == 1) { 386 if (crt == -1) { 387 tz->trips.critical.flags.valid = 0; 388 } else if (crt > 0) { 389 unsigned long crt_k = CELSIUS_TO_KELVIN(crt); 390 /* 391 * Allow override to lower critical threshold 392 */ 393 if (crt_k < tz->trips.critical.temperature) 394 tz->trips.critical.temperature = crt_k; 395 } 396 } 397 } 398 399 /* Critical Sleep (optional) */ 400 if (flag & ACPI_TRIPS_HOT) { 401 status = acpi_evaluate_integer(tz->device->handle, 402 "_HOT", NULL, &tz->trips.hot.temperature); 403 if (ACPI_FAILURE(status)) { 404 tz->trips.hot.flags.valid = 0; 405 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 406 "No hot threshold\n")); 407 } else { 408 tz->trips.hot.flags.valid = 1; 409 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 410 "Found hot threshold [%lu]\n", 411 tz->trips.critical.temperature)); 412 } 413 } 414 415 /* Passive (optional) */ 416 if (flag & ACPI_TRIPS_PASSIVE) { 417 valid = tz->trips.passive.flags.valid; 418 if (psv == -1) { 419 status = AE_SUPPORT; 420 } else if (psv > 0) { 421 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv); 422 status = AE_OK; 423 } else { 424 status = acpi_evaluate_integer(tz->device->handle, 425 "_PSV", NULL, &tz->trips.passive.temperature); 426 } 427 428 if (ACPI_FAILURE(status)) 429 tz->trips.passive.flags.valid = 0; 430 else { 431 tz->trips.passive.flags.valid = 1; 432 if (flag == ACPI_TRIPS_INIT) { 433 status = acpi_evaluate_integer( 434 tz->device->handle, "_TC1", 435 NULL, &tz->trips.passive.tc1); 436 if (ACPI_FAILURE(status)) 437 tz->trips.passive.flags.valid = 0; 438 status = acpi_evaluate_integer( 439 tz->device->handle, "_TC2", 440 NULL, &tz->trips.passive.tc2); 441 if (ACPI_FAILURE(status)) 442 tz->trips.passive.flags.valid = 0; 443 status = acpi_evaluate_integer( 444 tz->device->handle, "_TSP", 445 NULL, &tz->trips.passive.tsp); 446 if (ACPI_FAILURE(status)) 447 tz->trips.passive.flags.valid = 0; 448 } 449 } 450 } 451 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) { 452 memset(&devices, 0, sizeof(struct acpi_handle_list)); 453 status = acpi_evaluate_reference(tz->device->handle, "_PSL", 454 NULL, &devices); 455 if (ACPI_FAILURE(status)) 456 tz->trips.passive.flags.valid = 0; 457 else 458 tz->trips.passive.flags.valid = 1; 459 460 if (memcmp(&tz->trips.passive.devices, &devices, 461 sizeof(struct acpi_handle_list))) { 462 memcpy(&tz->trips.passive.devices, &devices, 463 sizeof(struct acpi_handle_list)); 464 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 465 } 466 } 467 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) { 468 if (valid != tz->trips.passive.flags.valid) 469 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state"); 470 } 471 472 /* Active (optional) */ 473 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 474 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; 475 valid = tz->trips.active[i].flags.valid; 476 477 if (act == -1) 478 break; /* disable all active trip points */ 479 480 if (flag & ACPI_TRIPS_ACTIVE) { 481 status = acpi_evaluate_integer(tz->device->handle, 482 name, NULL, &tz->trips.active[i].temperature); 483 if (ACPI_FAILURE(status)) { 484 tz->trips.active[i].flags.valid = 0; 485 if (i == 0) 486 break; 487 if (act <= 0) 488 break; 489 if (i == 1) 490 tz->trips.active[0].temperature = 491 CELSIUS_TO_KELVIN(act); 492 else 493 /* 494 * Don't allow override higher than 495 * the next higher trip point 496 */ 497 tz->trips.active[i - 1].temperature = 498 (tz->trips.active[i - 2].temperature < 499 CELSIUS_TO_KELVIN(act) ? 500 tz->trips.active[i - 2].temperature : 501 CELSIUS_TO_KELVIN(act)); 502 break; 503 } else 504 tz->trips.active[i].flags.valid = 1; 505 } 506 507 name[2] = 'L'; 508 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) { 509 memset(&devices, 0, sizeof(struct acpi_handle_list)); 510 status = acpi_evaluate_reference(tz->device->handle, 511 name, NULL, &devices); 512 if (ACPI_FAILURE(status)) 513 tz->trips.active[i].flags.valid = 0; 514 else 515 tz->trips.active[i].flags.valid = 1; 516 517 if (memcmp(&tz->trips.active[i].devices, &devices, 518 sizeof(struct acpi_handle_list))) { 519 memcpy(&tz->trips.active[i].devices, &devices, 520 sizeof(struct acpi_handle_list)); 521 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 522 } 523 } 524 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES)) 525 if (valid != tz->trips.active[i].flags.valid) 526 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state"); 527 528 if (!tz->trips.active[i].flags.valid) 529 break; 530 } 531 532 if (flag & ACPI_TRIPS_DEVICES) { 533 memset(&devices, 0, sizeof(struct acpi_handle_list)); 534 status = acpi_evaluate_reference(tz->device->handle, "_TZD", 535 NULL, &devices); 536 if (memcmp(&tz->devices, &devices, 537 sizeof(struct acpi_handle_list))) { 538 memcpy(&tz->devices, &devices, 539 sizeof(struct acpi_handle_list)); 540 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 541 } 542 } 543 544 return 0; 545 } 546 547 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) 548 { 549 return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT); 550 } 551 552 static int acpi_thermal_critical(struct acpi_thermal *tz) 553 { 554 if (!tz || !tz->trips.critical.flags.valid) 555 return -EINVAL; 556 557 if (tz->temperature >= tz->trips.critical.temperature) { 558 printk(KERN_WARNING PREFIX "Critical trip point\n"); 559 tz->trips.critical.flags.enabled = 1; 560 } else if (tz->trips.critical.flags.enabled) 561 tz->trips.critical.flags.enabled = 0; 562 563 acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL, 564 tz->trips.critical.flags.enabled); 565 acpi_bus_generate_netlink_event(tz->device->pnp.device_class, 566 tz->device->dev.bus_id, 567 ACPI_THERMAL_NOTIFY_CRITICAL, 568 tz->trips.critical.flags.enabled); 569 570 /* take no action if nocrt is set */ 571 if(!nocrt) { 572 printk(KERN_EMERG 573 "Critical temperature reached (%ld C), shutting down.\n", 574 KELVIN_TO_CELSIUS(tz->temperature)); 575 orderly_poweroff(true); 576 } 577 578 return 0; 579 } 580 581 static int acpi_thermal_hot(struct acpi_thermal *tz) 582 { 583 if (!tz || !tz->trips.hot.flags.valid) 584 return -EINVAL; 585 586 if (tz->temperature >= tz->trips.hot.temperature) { 587 printk(KERN_WARNING PREFIX "Hot trip point\n"); 588 tz->trips.hot.flags.enabled = 1; 589 } else if (tz->trips.hot.flags.enabled) 590 tz->trips.hot.flags.enabled = 0; 591 592 acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT, 593 tz->trips.hot.flags.enabled); 594 acpi_bus_generate_netlink_event(tz->device->pnp.device_class, 595 tz->device->dev.bus_id, 596 ACPI_THERMAL_NOTIFY_HOT, 597 tz->trips.hot.flags.enabled); 598 599 /* TBD: Call user-mode "sleep(S4)" function if nocrt is cleared */ 600 601 return 0; 602 } 603 604 static void acpi_thermal_passive(struct acpi_thermal *tz) 605 { 606 int result = 1; 607 struct acpi_thermal_passive *passive = NULL; 608 int trend = 0; 609 int i = 0; 610 611 612 if (!tz || !tz->trips.passive.flags.valid) 613 return; 614 615 passive = &(tz->trips.passive); 616 617 /* 618 * Above Trip? 619 * ----------- 620 * Calculate the thermal trend (using the passive cooling equation) 621 * and modify the performance limit for all passive cooling devices 622 * accordingly. Note that we assume symmetry. 623 */ 624 if (tz->temperature >= passive->temperature) { 625 trend = 626 (passive->tc1 * (tz->temperature - tz->last_temperature)) + 627 (passive->tc2 * (tz->temperature - passive->temperature)); 628 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 629 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n", 630 trend, passive->tc1, tz->temperature, 631 tz->last_temperature, passive->tc2, 632 tz->temperature, passive->temperature)); 633 passive->flags.enabled = 1; 634 /* Heating up? */ 635 if (trend > 0) 636 for (i = 0; i < passive->devices.count; i++) 637 acpi_processor_set_thermal_limit(passive-> 638 devices. 639 handles[i], 640 ACPI_PROCESSOR_LIMIT_INCREMENT); 641 /* Cooling off? */ 642 else if (trend < 0) { 643 for (i = 0; i < passive->devices.count; i++) 644 /* 645 * assume that we are on highest 646 * freq/lowest thrott and can leave 647 * passive mode, even in error case 648 */ 649 if (!acpi_processor_set_thermal_limit 650 (passive->devices.handles[i], 651 ACPI_PROCESSOR_LIMIT_DECREMENT)) 652 result = 0; 653 /* 654 * Leave cooling mode, even if the temp might 655 * higher than trip point This is because some 656 * machines might have long thermal polling 657 * frequencies (tsp) defined. We will fall back 658 * into passive mode in next cycle (probably quicker) 659 */ 660 if (result) { 661 passive->flags.enabled = 0; 662 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 663 "Disabling passive cooling, still above threshold," 664 " but we are cooling down\n")); 665 } 666 } 667 return; 668 } 669 670 /* 671 * Below Trip? 672 * ----------- 673 * Implement passive cooling hysteresis to slowly increase performance 674 * and avoid thrashing around the passive trip point. Note that we 675 * assume symmetry. 676 */ 677 if (!passive->flags.enabled) 678 return; 679 for (i = 0; i < passive->devices.count; i++) 680 if (!acpi_processor_set_thermal_limit 681 (passive->devices.handles[i], 682 ACPI_PROCESSOR_LIMIT_DECREMENT)) 683 result = 0; 684 if (result) { 685 passive->flags.enabled = 0; 686 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 687 "Disabling passive cooling (zone is cool)\n")); 688 } 689 } 690 691 static void acpi_thermal_active(struct acpi_thermal *tz) 692 { 693 int result = 0; 694 struct acpi_thermal_active *active = NULL; 695 int i = 0; 696 int j = 0; 697 unsigned long maxtemp = 0; 698 699 700 if (!tz) 701 return; 702 703 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 704 active = &(tz->trips.active[i]); 705 if (!active || !active->flags.valid) 706 break; 707 if (tz->temperature >= active->temperature) { 708 /* 709 * Above Threshold? 710 * ---------------- 711 * If not already enabled, turn ON all cooling devices 712 * associated with this active threshold. 713 */ 714 if (active->temperature > maxtemp) 715 tz->state.active_index = i; 716 maxtemp = active->temperature; 717 if (active->flags.enabled) 718 continue; 719 for (j = 0; j < active->devices.count; j++) { 720 result = 721 acpi_bus_set_power(active->devices. 722 handles[j], 723 ACPI_STATE_D0); 724 if (result) { 725 printk(KERN_WARNING PREFIX 726 "Unable to turn cooling device [%p] 'on'\n", 727 active->devices. 728 handles[j]); 729 continue; 730 } 731 active->flags.enabled = 1; 732 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 733 "Cooling device [%p] now 'on'\n", 734 active->devices.handles[j])); 735 } 736 continue; 737 } 738 if (!active->flags.enabled) 739 continue; 740 /* 741 * Below Threshold? 742 * ---------------- 743 * Turn OFF all cooling devices associated with this 744 * threshold. 745 */ 746 for (j = 0; j < active->devices.count; j++) { 747 result = acpi_bus_set_power(active->devices.handles[j], 748 ACPI_STATE_D3); 749 if (result) { 750 printk(KERN_WARNING PREFIX 751 "Unable to turn cooling device [%p] 'off'\n", 752 active->devices.handles[j]); 753 continue; 754 } 755 active->flags.enabled = 0; 756 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 757 "Cooling device [%p] now 'off'\n", 758 active->devices.handles[j])); 759 } 760 } 761 } 762 763 static void acpi_thermal_check(void *context); 764 765 static void acpi_thermal_run(unsigned long data) 766 { 767 struct acpi_thermal *tz = (struct acpi_thermal *)data; 768 if (!tz->zombie) 769 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data); 770 } 771 772 static void acpi_thermal_check(void *data) 773 { 774 int result = 0; 775 struct acpi_thermal *tz = data; 776 unsigned long sleep_time = 0; 777 unsigned long timeout_jiffies = 0; 778 int i = 0; 779 struct acpi_thermal_state state; 780 781 782 if (!tz) { 783 printk(KERN_ERR PREFIX "Invalid (NULL) context\n"); 784 return; 785 } 786 787 /* Check if someone else is already running */ 788 if (!mutex_trylock(&tz->lock)) 789 return; 790 791 state = tz->state; 792 793 result = acpi_thermal_get_temperature(tz); 794 if (result) 795 goto unlock; 796 797 if (!tz->tz_enabled) 798 goto unlock; 799 800 memset(&tz->state, 0, sizeof(tz->state)); 801 802 /* 803 * Check Trip Points 804 * ----------------- 805 * Compare the current temperature to the trip point values to see 806 * if we've entered one of the thermal policy states. Note that 807 * this function determines when a state is entered, but the 808 * individual policy decides when it is exited (e.g. hysteresis). 809 */ 810 if (tz->trips.critical.flags.valid) 811 state.critical |= 812 (tz->temperature >= tz->trips.critical.temperature); 813 if (tz->trips.hot.flags.valid) 814 state.hot |= (tz->temperature >= tz->trips.hot.temperature); 815 if (tz->trips.passive.flags.valid) 816 state.passive |= 817 (tz->temperature >= tz->trips.passive.temperature); 818 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) 819 if (tz->trips.active[i].flags.valid) 820 state.active |= 821 (tz->temperature >= 822 tz->trips.active[i].temperature); 823 824 /* 825 * Invoke Policy 826 * ------------- 827 * Separated from the above check to allow individual policy to 828 * determine when to exit a given state. 829 */ 830 if (state.critical) 831 acpi_thermal_critical(tz); 832 if (state.hot) 833 acpi_thermal_hot(tz); 834 if (state.passive) 835 acpi_thermal_passive(tz); 836 if (state.active) 837 acpi_thermal_active(tz); 838 839 /* 840 * Calculate State 841 * --------------- 842 * Again, separated from the above two to allow independent policy 843 * decisions. 844 */ 845 tz->state.critical = tz->trips.critical.flags.enabled; 846 tz->state.hot = tz->trips.hot.flags.enabled; 847 tz->state.passive = tz->trips.passive.flags.enabled; 848 tz->state.active = 0; 849 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) 850 tz->state.active |= tz->trips.active[i].flags.enabled; 851 852 /* 853 * Calculate Sleep Time 854 * -------------------- 855 * If we're in the passive state, use _TSP's value. Otherwise 856 * use the default polling frequency (e.g. _TZP). If no polling 857 * frequency is specified then we'll wait forever (at least until 858 * a thermal event occurs). Note that _TSP and _TZD values are 859 * given in 1/10th seconds (we must covert to milliseconds). 860 */ 861 if (tz->state.passive) { 862 sleep_time = tz->trips.passive.tsp * 100; 863 timeout_jiffies = jiffies + (HZ * sleep_time) / 1000; 864 } else if (tz->polling_frequency > 0) { 865 sleep_time = tz->polling_frequency * 100; 866 timeout_jiffies = round_jiffies(jiffies + (HZ * sleep_time) / 1000); 867 } 868 869 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n", 870 tz->name, tz->temperature, sleep_time)); 871 872 /* 873 * Schedule Next Poll 874 * ------------------ 875 */ 876 if (!sleep_time) { 877 if (timer_pending(&(tz->timer))) 878 del_timer(&(tz->timer)); 879 } else { 880 if (timer_pending(&(tz->timer))) 881 mod_timer(&(tz->timer), timeout_jiffies); 882 else { 883 tz->timer.data = (unsigned long)tz; 884 tz->timer.function = acpi_thermal_run; 885 tz->timer.expires = timeout_jiffies; 886 add_timer(&(tz->timer)); 887 } 888 } 889 unlock: 890 mutex_unlock(&tz->lock); 891 } 892 893 /* sys I/F for generic thermal sysfs support */ 894 #define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200) 895 896 static int thermal_get_temp(struct thermal_zone_device *thermal, char *buf) 897 { 898 struct acpi_thermal *tz = thermal->devdata; 899 int result; 900 901 if (!tz) 902 return -EINVAL; 903 904 result = acpi_thermal_get_temperature(tz); 905 if (result) 906 return result; 907 908 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(tz->temperature)); 909 } 910 911 static const char enabled[] = "kernel"; 912 static const char disabled[] = "user"; 913 static int thermal_get_mode(struct thermal_zone_device *thermal, 914 char *buf) 915 { 916 struct acpi_thermal *tz = thermal->devdata; 917 918 if (!tz) 919 return -EINVAL; 920 921 return sprintf(buf, "%s\n", tz->tz_enabled ? 922 enabled : disabled); 923 } 924 925 static int thermal_set_mode(struct thermal_zone_device *thermal, 926 const char *buf) 927 { 928 struct acpi_thermal *tz = thermal->devdata; 929 int enable; 930 931 if (!tz) 932 return -EINVAL; 933 934 /* 935 * enable/disable thermal management from ACPI thermal driver 936 */ 937 if (!strncmp(buf, enabled, sizeof enabled - 1)) 938 enable = 1; 939 else if (!strncmp(buf, disabled, sizeof disabled - 1)) 940 enable = 0; 941 else 942 return -EINVAL; 943 944 if (enable != tz->tz_enabled) { 945 tz->tz_enabled = enable; 946 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 947 "%s ACPI thermal control\n", 948 tz->tz_enabled ? enabled : disabled)); 949 acpi_thermal_check(tz); 950 } 951 return 0; 952 } 953 954 static int thermal_get_trip_type(struct thermal_zone_device *thermal, 955 int trip, char *buf) 956 { 957 struct acpi_thermal *tz = thermal->devdata; 958 int i; 959 960 if (!tz || trip < 0) 961 return -EINVAL; 962 963 if (tz->trips.critical.flags.valid) { 964 if (!trip) 965 return sprintf(buf, "critical\n"); 966 trip--; 967 } 968 969 if (tz->trips.hot.flags.valid) { 970 if (!trip) 971 return sprintf(buf, "hot\n"); 972 trip--; 973 } 974 975 if (tz->trips.passive.flags.valid) { 976 if (!trip) 977 return sprintf(buf, "passive\n"); 978 trip--; 979 } 980 981 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 982 tz->trips.active[i].flags.valid; i++) { 983 if (!trip) 984 return sprintf(buf, "active%d\n", i); 985 trip--; 986 } 987 988 return -EINVAL; 989 } 990 991 static int thermal_get_trip_temp(struct thermal_zone_device *thermal, 992 int trip, char *buf) 993 { 994 struct acpi_thermal *tz = thermal->devdata; 995 int i; 996 997 if (!tz || trip < 0) 998 return -EINVAL; 999 1000 if (tz->trips.critical.flags.valid) { 1001 if (!trip) 1002 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS( 1003 tz->trips.critical.temperature)); 1004 trip--; 1005 } 1006 1007 if (tz->trips.hot.flags.valid) { 1008 if (!trip) 1009 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS( 1010 tz->trips.hot.temperature)); 1011 trip--; 1012 } 1013 1014 if (tz->trips.passive.flags.valid) { 1015 if (!trip) 1016 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS( 1017 tz->trips.passive.temperature)); 1018 trip--; 1019 } 1020 1021 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 1022 tz->trips.active[i].flags.valid; i++) { 1023 if (!trip) 1024 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS( 1025 tz->trips.active[i].temperature)); 1026 trip--; 1027 } 1028 1029 return -EINVAL; 1030 } 1031 1032 static int thermal_get_crit_temp(struct thermal_zone_device *thermal, 1033 unsigned long *temperature) { 1034 struct acpi_thermal *tz = thermal->devdata; 1035 1036 if (tz->trips.critical.flags.valid) { 1037 *temperature = KELVIN_TO_MILLICELSIUS( 1038 tz->trips.critical.temperature); 1039 return 0; 1040 } else 1041 return -EINVAL; 1042 } 1043 1044 typedef int (*cb)(struct thermal_zone_device *, int, 1045 struct thermal_cooling_device *); 1046 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal, 1047 struct thermal_cooling_device *cdev, 1048 cb action) 1049 { 1050 struct acpi_device *device = cdev->devdata; 1051 struct acpi_thermal *tz = thermal->devdata; 1052 struct acpi_device *dev; 1053 acpi_status status; 1054 acpi_handle handle; 1055 int i; 1056 int j; 1057 int trip = -1; 1058 int result = 0; 1059 1060 if (tz->trips.critical.flags.valid) 1061 trip++; 1062 1063 if (tz->trips.hot.flags.valid) 1064 trip++; 1065 1066 if (tz->trips.passive.flags.valid) { 1067 trip++; 1068 for (i = 0; i < tz->trips.passive.devices.count; 1069 i++) { 1070 handle = tz->trips.passive.devices.handles[i]; 1071 status = acpi_bus_get_device(handle, &dev); 1072 if (ACPI_SUCCESS(status) && (dev == device)) { 1073 result = action(thermal, trip, cdev); 1074 if (result) 1075 goto failed; 1076 } 1077 } 1078 } 1079 1080 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1081 if (!tz->trips.active[i].flags.valid) 1082 break; 1083 trip++; 1084 for (j = 0; 1085 j < tz->trips.active[i].devices.count; 1086 j++) { 1087 handle = tz->trips.active[i].devices.handles[j]; 1088 status = acpi_bus_get_device(handle, &dev); 1089 if (ACPI_SUCCESS(status) && (dev == device)) { 1090 result = action(thermal, trip, cdev); 1091 if (result) 1092 goto failed; 1093 } 1094 } 1095 } 1096 1097 for (i = 0; i < tz->devices.count; i++) { 1098 handle = tz->devices.handles[i]; 1099 status = acpi_bus_get_device(handle, &dev); 1100 if (ACPI_SUCCESS(status) && (dev == device)) { 1101 result = action(thermal, -1, cdev); 1102 if (result) 1103 goto failed; 1104 } 1105 } 1106 1107 failed: 1108 return result; 1109 } 1110 1111 static int 1112 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal, 1113 struct thermal_cooling_device *cdev) 1114 { 1115 return acpi_thermal_cooling_device_cb(thermal, cdev, 1116 thermal_zone_bind_cooling_device); 1117 } 1118 1119 static int 1120 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal, 1121 struct thermal_cooling_device *cdev) 1122 { 1123 return acpi_thermal_cooling_device_cb(thermal, cdev, 1124 thermal_zone_unbind_cooling_device); 1125 } 1126 1127 static struct thermal_zone_device_ops acpi_thermal_zone_ops = { 1128 .bind = acpi_thermal_bind_cooling_device, 1129 .unbind = acpi_thermal_unbind_cooling_device, 1130 .get_temp = thermal_get_temp, 1131 .get_mode = thermal_get_mode, 1132 .set_mode = thermal_set_mode, 1133 .get_trip_type = thermal_get_trip_type, 1134 .get_trip_temp = thermal_get_trip_temp, 1135 .get_crit_temp = thermal_get_crit_temp, 1136 }; 1137 1138 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz) 1139 { 1140 int trips = 0; 1141 int result; 1142 acpi_status status; 1143 int i; 1144 1145 if (tz->trips.critical.flags.valid) 1146 trips++; 1147 1148 if (tz->trips.hot.flags.valid) 1149 trips++; 1150 1151 if (tz->trips.passive.flags.valid) 1152 trips++; 1153 1154 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 1155 tz->trips.active[i].flags.valid; i++, trips++); 1156 tz->thermal_zone = thermal_zone_device_register("acpitz", 1157 trips, tz, &acpi_thermal_zone_ops); 1158 if (IS_ERR(tz->thermal_zone)) 1159 return -ENODEV; 1160 1161 result = sysfs_create_link(&tz->device->dev.kobj, 1162 &tz->thermal_zone->device.kobj, "thermal_zone"); 1163 if (result) 1164 return result; 1165 1166 result = sysfs_create_link(&tz->thermal_zone->device.kobj, 1167 &tz->device->dev.kobj, "device"); 1168 if (result) 1169 return result; 1170 1171 status = acpi_attach_data(tz->device->handle, 1172 acpi_bus_private_data_handler, 1173 tz->thermal_zone); 1174 if (ACPI_FAILURE(status)) { 1175 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 1176 "Error attaching device data\n")); 1177 return -ENODEV; 1178 } 1179 1180 tz->tz_enabled = 1; 1181 1182 dev_info(&tz->device->dev, "registered as thermal_zone%d\n", 1183 tz->thermal_zone->id); 1184 return 0; 1185 } 1186 1187 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz) 1188 { 1189 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); 1190 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device"); 1191 thermal_zone_device_unregister(tz->thermal_zone); 1192 tz->thermal_zone = NULL; 1193 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler); 1194 } 1195 1196 1197 /* -------------------------------------------------------------------------- 1198 FS Interface (/proc) 1199 -------------------------------------------------------------------------- */ 1200 1201 static struct proc_dir_entry *acpi_thermal_dir; 1202 1203 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset) 1204 { 1205 struct acpi_thermal *tz = seq->private; 1206 1207 1208 if (!tz) 1209 goto end; 1210 1211 seq_puts(seq, "state: "); 1212 1213 if (!tz->state.critical && !tz->state.hot && !tz->state.passive 1214 && !tz->state.active) 1215 seq_puts(seq, "ok\n"); 1216 else { 1217 if (tz->state.critical) 1218 seq_puts(seq, "critical "); 1219 if (tz->state.hot) 1220 seq_puts(seq, "hot "); 1221 if (tz->state.passive) 1222 seq_puts(seq, "passive "); 1223 if (tz->state.active) 1224 seq_printf(seq, "active[%d]", tz->state.active_index); 1225 seq_puts(seq, "\n"); 1226 } 1227 1228 end: 1229 return 0; 1230 } 1231 1232 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file) 1233 { 1234 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data); 1235 } 1236 1237 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset) 1238 { 1239 int result = 0; 1240 struct acpi_thermal *tz = seq->private; 1241 1242 1243 if (!tz) 1244 goto end; 1245 1246 result = acpi_thermal_get_temperature(tz); 1247 if (result) 1248 goto end; 1249 1250 seq_printf(seq, "temperature: %ld C\n", 1251 KELVIN_TO_CELSIUS(tz->temperature)); 1252 1253 end: 1254 return 0; 1255 } 1256 1257 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file) 1258 { 1259 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data); 1260 } 1261 1262 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset) 1263 { 1264 struct acpi_thermal *tz = seq->private; 1265 struct acpi_device *device; 1266 acpi_status status; 1267 1268 int i = 0; 1269 int j = 0; 1270 1271 1272 if (!tz) 1273 goto end; 1274 1275 if (tz->trips.critical.flags.valid) 1276 seq_printf(seq, "critical (S5): %ld C%s", 1277 KELVIN_TO_CELSIUS(tz->trips.critical.temperature), 1278 nocrt ? " <disabled>\n" : "\n"); 1279 1280 if (tz->trips.hot.flags.valid) 1281 seq_printf(seq, "hot (S4): %ld C%s", 1282 KELVIN_TO_CELSIUS(tz->trips.hot.temperature), 1283 nocrt ? " <disabled>\n" : "\n"); 1284 1285 if (tz->trips.passive.flags.valid) { 1286 seq_printf(seq, 1287 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=", 1288 KELVIN_TO_CELSIUS(tz->trips.passive.temperature), 1289 tz->trips.passive.tc1, tz->trips.passive.tc2, 1290 tz->trips.passive.tsp); 1291 for (j = 0; j < tz->trips.passive.devices.count; j++) { 1292 status = acpi_bus_get_device(tz->trips.passive.devices. 1293 handles[j], &device); 1294 seq_printf(seq, "%4.4s ", status ? "" : 1295 acpi_device_bid(device)); 1296 } 1297 seq_puts(seq, "\n"); 1298 } 1299 1300 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1301 if (!(tz->trips.active[i].flags.valid)) 1302 break; 1303 seq_printf(seq, "active[%d]: %ld C: devices=", 1304 i, 1305 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature)); 1306 for (j = 0; j < tz->trips.active[i].devices.count; j++){ 1307 status = acpi_bus_get_device(tz->trips.active[i]. 1308 devices.handles[j], 1309 &device); 1310 seq_printf(seq, "%4.4s ", status ? "" : 1311 acpi_device_bid(device)); 1312 } 1313 seq_puts(seq, "\n"); 1314 } 1315 1316 end: 1317 return 0; 1318 } 1319 1320 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file) 1321 { 1322 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data); 1323 } 1324 1325 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset) 1326 { 1327 struct acpi_thermal *tz = seq->private; 1328 1329 1330 if (!tz) 1331 goto end; 1332 1333 if (!tz->flags.cooling_mode) 1334 seq_puts(seq, "<setting not supported>\n"); 1335 else 1336 seq_puts(seq, "0 - Active; 1 - Passive\n"); 1337 1338 end: 1339 return 0; 1340 } 1341 1342 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file) 1343 { 1344 return single_open(file, acpi_thermal_cooling_seq_show, 1345 PDE(inode)->data); 1346 } 1347 1348 static ssize_t 1349 acpi_thermal_write_cooling_mode(struct file *file, 1350 const char __user * buffer, 1351 size_t count, loff_t * ppos) 1352 { 1353 struct seq_file *m = file->private_data; 1354 struct acpi_thermal *tz = m->private; 1355 int result = 0; 1356 char mode_string[12] = { '\0' }; 1357 1358 1359 if (!tz || (count > sizeof(mode_string) - 1)) 1360 return -EINVAL; 1361 1362 if (!tz->flags.cooling_mode) 1363 return -ENODEV; 1364 1365 if (copy_from_user(mode_string, buffer, count)) 1366 return -EFAULT; 1367 1368 mode_string[count] = '\0'; 1369 1370 result = acpi_thermal_set_cooling_mode(tz, 1371 simple_strtoul(mode_string, NULL, 1372 0)); 1373 if (result) 1374 return result; 1375 1376 acpi_thermal_check(tz); 1377 1378 return count; 1379 } 1380 1381 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset) 1382 { 1383 struct acpi_thermal *tz = seq->private; 1384 1385 1386 if (!tz) 1387 goto end; 1388 1389 if (!tz->polling_frequency) { 1390 seq_puts(seq, "<polling disabled>\n"); 1391 goto end; 1392 } 1393 1394 seq_printf(seq, "polling frequency: %lu seconds\n", 1395 (tz->polling_frequency / 10)); 1396 1397 end: 1398 return 0; 1399 } 1400 1401 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file) 1402 { 1403 return single_open(file, acpi_thermal_polling_seq_show, 1404 PDE(inode)->data); 1405 } 1406 1407 static ssize_t 1408 acpi_thermal_write_polling(struct file *file, 1409 const char __user * buffer, 1410 size_t count, loff_t * ppos) 1411 { 1412 struct seq_file *m = file->private_data; 1413 struct acpi_thermal *tz = m->private; 1414 int result = 0; 1415 char polling_string[12] = { '\0' }; 1416 int seconds = 0; 1417 1418 1419 if (!tz || (count > sizeof(polling_string) - 1)) 1420 return -EINVAL; 1421 1422 if (copy_from_user(polling_string, buffer, count)) 1423 return -EFAULT; 1424 1425 polling_string[count] = '\0'; 1426 1427 seconds = simple_strtoul(polling_string, NULL, 0); 1428 1429 result = acpi_thermal_set_polling(tz, seconds); 1430 if (result) 1431 return result; 1432 1433 acpi_thermal_check(tz); 1434 1435 return count; 1436 } 1437 1438 static int acpi_thermal_add_fs(struct acpi_device *device) 1439 { 1440 struct proc_dir_entry *entry = NULL; 1441 1442 1443 if (!acpi_device_dir(device)) { 1444 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 1445 acpi_thermal_dir); 1446 if (!acpi_device_dir(device)) 1447 return -ENODEV; 1448 acpi_device_dir(device)->owner = THIS_MODULE; 1449 } 1450 1451 /* 'state' [R] */ 1452 entry = proc_create_data(ACPI_THERMAL_FILE_STATE, 1453 S_IRUGO, acpi_device_dir(device), 1454 &acpi_thermal_state_fops, 1455 acpi_driver_data(device)); 1456 if (!entry) 1457 return -ENODEV; 1458 1459 /* 'temperature' [R] */ 1460 entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE, 1461 S_IRUGO, acpi_device_dir(device), 1462 &acpi_thermal_temp_fops, 1463 acpi_driver_data(device)); 1464 if (!entry) 1465 return -ENODEV; 1466 1467 /* 'trip_points' [R] */ 1468 entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS, 1469 S_IRUGO, 1470 acpi_device_dir(device), 1471 &acpi_thermal_trip_fops, 1472 acpi_driver_data(device)); 1473 if (!entry) 1474 return -ENODEV; 1475 1476 /* 'cooling_mode' [R/W] */ 1477 entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE, 1478 S_IFREG | S_IRUGO | S_IWUSR, 1479 acpi_device_dir(device), 1480 &acpi_thermal_cooling_fops, 1481 acpi_driver_data(device)); 1482 if (!entry) 1483 return -ENODEV; 1484 1485 /* 'polling_frequency' [R/W] */ 1486 entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ, 1487 S_IFREG | S_IRUGO | S_IWUSR, 1488 acpi_device_dir(device), 1489 &acpi_thermal_polling_fops, 1490 acpi_driver_data(device)); 1491 if (!entry) 1492 return -ENODEV; 1493 return 0; 1494 } 1495 1496 static int acpi_thermal_remove_fs(struct acpi_device *device) 1497 { 1498 1499 if (acpi_device_dir(device)) { 1500 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ, 1501 acpi_device_dir(device)); 1502 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE, 1503 acpi_device_dir(device)); 1504 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS, 1505 acpi_device_dir(device)); 1506 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE, 1507 acpi_device_dir(device)); 1508 remove_proc_entry(ACPI_THERMAL_FILE_STATE, 1509 acpi_device_dir(device)); 1510 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir); 1511 acpi_device_dir(device) = NULL; 1512 } 1513 1514 return 0; 1515 } 1516 1517 /* -------------------------------------------------------------------------- 1518 Driver Interface 1519 -------------------------------------------------------------------------- */ 1520 1521 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data) 1522 { 1523 struct acpi_thermal *tz = data; 1524 struct acpi_device *device = NULL; 1525 1526 1527 if (!tz) 1528 return; 1529 1530 device = tz->device; 1531 1532 switch (event) { 1533 case ACPI_THERMAL_NOTIFY_TEMPERATURE: 1534 acpi_thermal_check(tz); 1535 break; 1536 case ACPI_THERMAL_NOTIFY_THRESHOLDS: 1537 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS); 1538 acpi_thermal_check(tz); 1539 acpi_bus_generate_proc_event(device, event, 0); 1540 acpi_bus_generate_netlink_event(device->pnp.device_class, 1541 device->dev.bus_id, event, 0); 1542 break; 1543 case ACPI_THERMAL_NOTIFY_DEVICES: 1544 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES); 1545 acpi_thermal_check(tz); 1546 acpi_bus_generate_proc_event(device, event, 0); 1547 acpi_bus_generate_netlink_event(device->pnp.device_class, 1548 device->dev.bus_id, event, 0); 1549 break; 1550 default: 1551 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1552 "Unsupported event [0x%x]\n", event)); 1553 break; 1554 } 1555 1556 return; 1557 } 1558 1559 static int acpi_thermal_get_info(struct acpi_thermal *tz) 1560 { 1561 int result = 0; 1562 1563 1564 if (!tz) 1565 return -EINVAL; 1566 1567 /* Get temperature [_TMP] (required) */ 1568 result = acpi_thermal_get_temperature(tz); 1569 if (result) 1570 return result; 1571 1572 /* Get trip points [_CRT, _PSV, etc.] (required) */ 1573 result = acpi_thermal_get_trip_points(tz); 1574 if (result) 1575 return result; 1576 1577 /* Set the cooling mode [_SCP] to active cooling (default) */ 1578 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE); 1579 if (!result) 1580 tz->flags.cooling_mode = 1; 1581 1582 /* Get default polling frequency [_TZP] (optional) */ 1583 if (tzp) 1584 tz->polling_frequency = tzp; 1585 else 1586 acpi_thermal_get_polling_frequency(tz); 1587 1588 return 0; 1589 } 1590 1591 static int acpi_thermal_add(struct acpi_device *device) 1592 { 1593 int result = 0; 1594 acpi_status status = AE_OK; 1595 struct acpi_thermal *tz = NULL; 1596 1597 1598 if (!device) 1599 return -EINVAL; 1600 1601 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL); 1602 if (!tz) 1603 return -ENOMEM; 1604 1605 tz->device = device; 1606 strcpy(tz->name, device->pnp.bus_id); 1607 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME); 1608 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS); 1609 acpi_driver_data(device) = tz; 1610 mutex_init(&tz->lock); 1611 1612 1613 result = acpi_thermal_get_info(tz); 1614 if (result) 1615 goto free_memory; 1616 1617 result = acpi_thermal_register_thermal_zone(tz); 1618 if (result) 1619 goto free_memory; 1620 1621 result = acpi_thermal_add_fs(device); 1622 if (result) 1623 goto unregister_thermal_zone; 1624 1625 init_timer(&tz->timer); 1626 1627 acpi_thermal_check(tz); 1628 1629 status = acpi_install_notify_handler(device->handle, 1630 ACPI_DEVICE_NOTIFY, 1631 acpi_thermal_notify, tz); 1632 if (ACPI_FAILURE(status)) { 1633 result = -ENODEV; 1634 goto remove_fs; 1635 } 1636 1637 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n", 1638 acpi_device_name(device), acpi_device_bid(device), 1639 KELVIN_TO_CELSIUS(tz->temperature)); 1640 goto end; 1641 1642 remove_fs: 1643 acpi_thermal_remove_fs(device); 1644 unregister_thermal_zone: 1645 thermal_zone_device_unregister(tz->thermal_zone); 1646 free_memory: 1647 kfree(tz); 1648 end: 1649 return result; 1650 } 1651 1652 static int acpi_thermal_remove(struct acpi_device *device, int type) 1653 { 1654 acpi_status status = AE_OK; 1655 struct acpi_thermal *tz = NULL; 1656 1657 1658 if (!device || !acpi_driver_data(device)) 1659 return -EINVAL; 1660 1661 tz = acpi_driver_data(device); 1662 1663 /* avoid timer adding new defer task */ 1664 tz->zombie = 1; 1665 /* wait for running timer (on other CPUs) finish */ 1666 del_timer_sync(&(tz->timer)); 1667 /* synchronize deferred task */ 1668 acpi_os_wait_events_complete(NULL); 1669 /* deferred task may reinsert timer */ 1670 del_timer_sync(&(tz->timer)); 1671 1672 status = acpi_remove_notify_handler(device->handle, 1673 ACPI_DEVICE_NOTIFY, 1674 acpi_thermal_notify); 1675 1676 /* Terminate policy */ 1677 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) { 1678 tz->trips.passive.flags.enabled = 0; 1679 acpi_thermal_passive(tz); 1680 } 1681 if (tz->trips.active[0].flags.valid 1682 && tz->trips.active[0].flags.enabled) { 1683 tz->trips.active[0].flags.enabled = 0; 1684 acpi_thermal_active(tz); 1685 } 1686 1687 acpi_thermal_remove_fs(device); 1688 acpi_thermal_unregister_thermal_zone(tz); 1689 mutex_destroy(&tz->lock); 1690 kfree(tz); 1691 return 0; 1692 } 1693 1694 static int acpi_thermal_resume(struct acpi_device *device) 1695 { 1696 struct acpi_thermal *tz = NULL; 1697 int i, j, power_state, result; 1698 1699 1700 if (!device || !acpi_driver_data(device)) 1701 return -EINVAL; 1702 1703 tz = acpi_driver_data(device); 1704 1705 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1706 if (!(&tz->trips.active[i])) 1707 break; 1708 if (!tz->trips.active[i].flags.valid) 1709 break; 1710 tz->trips.active[i].flags.enabled = 1; 1711 for (j = 0; j < tz->trips.active[i].devices.count; j++) { 1712 result = acpi_bus_get_power(tz->trips.active[i].devices. 1713 handles[j], &power_state); 1714 if (result || (power_state != ACPI_STATE_D0)) { 1715 tz->trips.active[i].flags.enabled = 0; 1716 break; 1717 } 1718 } 1719 tz->state.active |= tz->trips.active[i].flags.enabled; 1720 } 1721 1722 acpi_thermal_check(tz); 1723 1724 return AE_OK; 1725 } 1726 1727 static int thermal_act(const struct dmi_system_id *d) { 1728 1729 if (act == 0) { 1730 printk(KERN_NOTICE "ACPI: %s detected: " 1731 "disabling all active thermal trip points\n", d->ident); 1732 act = -1; 1733 } 1734 return 0; 1735 } 1736 static int thermal_nocrt(const struct dmi_system_id *d) { 1737 1738 printk(KERN_NOTICE "ACPI: %s detected: " 1739 "disabling all critical thermal trip point actions.\n", d->ident); 1740 nocrt = 1; 1741 return 0; 1742 } 1743 static int thermal_tzp(const struct dmi_system_id *d) { 1744 1745 if (tzp == 0) { 1746 printk(KERN_NOTICE "ACPI: %s detected: " 1747 "enabling thermal zone polling\n", d->ident); 1748 tzp = 300; /* 300 dS = 30 Seconds */ 1749 } 1750 return 0; 1751 } 1752 static int thermal_psv(const struct dmi_system_id *d) { 1753 1754 if (psv == 0) { 1755 printk(KERN_NOTICE "ACPI: %s detected: " 1756 "disabling all passive thermal trip points\n", d->ident); 1757 psv = -1; 1758 } 1759 return 0; 1760 } 1761 1762 static struct dmi_system_id thermal_dmi_table[] __initdata = { 1763 /* 1764 * Award BIOS on this AOpen makes thermal control almost worthless. 1765 * http://bugzilla.kernel.org/show_bug.cgi?id=8842 1766 */ 1767 { 1768 .callback = thermal_act, 1769 .ident = "AOpen i915GMm-HFS", 1770 .matches = { 1771 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1772 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1773 }, 1774 }, 1775 { 1776 .callback = thermal_psv, 1777 .ident = "AOpen i915GMm-HFS", 1778 .matches = { 1779 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1780 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1781 }, 1782 }, 1783 { 1784 .callback = thermal_tzp, 1785 .ident = "AOpen i915GMm-HFS", 1786 .matches = { 1787 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1788 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1789 }, 1790 }, 1791 { 1792 .callback = thermal_nocrt, 1793 .ident = "Gigabyte GA-7ZX", 1794 .matches = { 1795 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."), 1796 DMI_MATCH(DMI_BOARD_NAME, "7ZX"), 1797 }, 1798 }, 1799 {} 1800 }; 1801 1802 static int __init acpi_thermal_init(void) 1803 { 1804 int result = 0; 1805 1806 dmi_check_system(thermal_dmi_table); 1807 1808 if (off) { 1809 printk(KERN_NOTICE "ACPI: thermal control disabled\n"); 1810 return -ENODEV; 1811 } 1812 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir); 1813 if (!acpi_thermal_dir) 1814 return -ENODEV; 1815 acpi_thermal_dir->owner = THIS_MODULE; 1816 1817 result = acpi_bus_register_driver(&acpi_thermal_driver); 1818 if (result < 0) { 1819 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir); 1820 return -ENODEV; 1821 } 1822 1823 return 0; 1824 } 1825 1826 static void __exit acpi_thermal_exit(void) 1827 { 1828 1829 acpi_bus_unregister_driver(&acpi_thermal_driver); 1830 1831 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir); 1832 1833 return; 1834 } 1835 1836 module_init(acpi_thermal_init); 1837 module_exit(acpi_thermal_exit); 1838