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 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 KELVIN_TO_CELSIUS(t) (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10) 69 #define CELSIUS_TO_KELVIN(t) ((t+273)*10) 70 71 #define _COMPONENT ACPI_THERMAL_COMPONENT 72 ACPI_MODULE_NAME("thermal"); 73 74 MODULE_AUTHOR("Paul Diefenbaugh"); 75 MODULE_DESCRIPTION("ACPI Thermal Zone Driver"); 76 MODULE_LICENSE("GPL"); 77 78 static int act; 79 module_param(act, int, 0644); 80 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points."); 81 82 static int crt; 83 module_param(crt, int, 0644); 84 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points."); 85 86 static int tzp; 87 module_param(tzp, int, 0444); 88 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds."); 89 90 static int nocrt; 91 module_param(nocrt, int, 0); 92 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points."); 93 94 static int off; 95 module_param(off, int, 0); 96 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support."); 97 98 static int psv; 99 module_param(psv, int, 0644); 100 MODULE_PARM_DESC(psv, "Disable or override all passive trip points."); 101 102 static int acpi_thermal_add(struct acpi_device *device); 103 static int acpi_thermal_remove(struct acpi_device *device, int type); 104 static int acpi_thermal_resume(struct acpi_device *device); 105 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file); 106 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file); 107 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file); 108 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file); 109 static ssize_t acpi_thermal_write_cooling_mode(struct file *, 110 const char __user *, size_t, 111 loff_t *); 112 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file); 113 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *, 114 size_t, loff_t *); 115 116 static const struct acpi_device_id thermal_device_ids[] = { 117 {ACPI_THERMAL_HID, 0}, 118 {"", 0}, 119 }; 120 MODULE_DEVICE_TABLE(acpi, thermal_device_ids); 121 122 static struct acpi_driver acpi_thermal_driver = { 123 .name = "thermal", 124 .class = ACPI_THERMAL_CLASS, 125 .ids = thermal_device_ids, 126 .ops = { 127 .add = acpi_thermal_add, 128 .remove = acpi_thermal_remove, 129 .resume = acpi_thermal_resume, 130 }, 131 }; 132 133 struct acpi_thermal_state { 134 u8 critical:1; 135 u8 hot:1; 136 u8 passive:1; 137 u8 active:1; 138 u8 reserved:4; 139 int active_index; 140 }; 141 142 struct acpi_thermal_state_flags { 143 u8 valid:1; 144 u8 enabled:1; 145 u8 reserved:6; 146 }; 147 148 struct acpi_thermal_critical { 149 struct acpi_thermal_state_flags flags; 150 unsigned long temperature; 151 }; 152 153 struct acpi_thermal_hot { 154 struct acpi_thermal_state_flags flags; 155 unsigned long temperature; 156 }; 157 158 struct acpi_thermal_passive { 159 struct acpi_thermal_state_flags flags; 160 unsigned long temperature; 161 unsigned long tc1; 162 unsigned long tc2; 163 unsigned long tsp; 164 struct acpi_handle_list devices; 165 }; 166 167 struct acpi_thermal_active { 168 struct acpi_thermal_state_flags flags; 169 unsigned long temperature; 170 struct acpi_handle_list devices; 171 }; 172 173 struct acpi_thermal_trips { 174 struct acpi_thermal_critical critical; 175 struct acpi_thermal_hot hot; 176 struct acpi_thermal_passive passive; 177 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE]; 178 }; 179 180 struct acpi_thermal_flags { 181 u8 cooling_mode:1; /* _SCP */ 182 u8 devices:1; /* _TZD */ 183 u8 reserved:6; 184 }; 185 186 struct acpi_thermal { 187 struct acpi_device * device; 188 acpi_bus_id name; 189 unsigned long temperature; 190 unsigned long last_temperature; 191 unsigned long polling_frequency; 192 volatile u8 zombie; 193 struct acpi_thermal_flags flags; 194 struct acpi_thermal_state state; 195 struct acpi_thermal_trips trips; 196 struct acpi_handle_list devices; 197 struct timer_list timer; 198 struct mutex lock; 199 }; 200 201 static const struct file_operations acpi_thermal_state_fops = { 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 .open = acpi_thermal_temp_open_fs, 210 .read = seq_read, 211 .llseek = seq_lseek, 212 .release = single_release, 213 }; 214 215 static const struct file_operations acpi_thermal_trip_fops = { 216 .open = acpi_thermal_trip_open_fs, 217 .read = seq_read, 218 .llseek = seq_lseek, 219 .release = single_release, 220 }; 221 222 static const struct file_operations acpi_thermal_cooling_fops = { 223 .open = acpi_thermal_cooling_open_fs, 224 .read = seq_read, 225 .write = acpi_thermal_write_cooling_mode, 226 .llseek = seq_lseek, 227 .release = single_release, 228 }; 229 230 static const struct file_operations acpi_thermal_polling_fops = { 231 .open = acpi_thermal_polling_open_fs, 232 .read = seq_read, 233 .write = acpi_thermal_write_polling, 234 .llseek = seq_lseek, 235 .release = single_release, 236 }; 237 238 /* -------------------------------------------------------------------------- 239 Thermal Zone Management 240 -------------------------------------------------------------------------- */ 241 242 static int acpi_thermal_get_temperature(struct acpi_thermal *tz) 243 { 244 acpi_status status = AE_OK; 245 246 247 if (!tz) 248 return -EINVAL; 249 250 tz->last_temperature = tz->temperature; 251 252 status = 253 acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature); 254 if (ACPI_FAILURE(status)) 255 return -ENODEV; 256 257 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n", 258 tz->temperature)); 259 260 return 0; 261 } 262 263 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz) 264 { 265 acpi_status status = AE_OK; 266 267 268 if (!tz) 269 return -EINVAL; 270 271 status = 272 acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, 273 &tz->polling_frequency); 274 if (ACPI_FAILURE(status)) 275 return -ENODEV; 276 277 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n", 278 tz->polling_frequency)); 279 280 return 0; 281 } 282 283 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds) 284 { 285 286 if (!tz) 287 return -EINVAL; 288 289 tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */ 290 291 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 292 "Polling frequency set to %lu seconds\n", 293 tz->polling_frequency/10)); 294 295 return 0; 296 } 297 298 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode) 299 { 300 acpi_status status = AE_OK; 301 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 302 struct acpi_object_list arg_list = { 1, &arg0 }; 303 acpi_handle handle = NULL; 304 305 306 if (!tz) 307 return -EINVAL; 308 309 status = acpi_get_handle(tz->device->handle, "_SCP", &handle); 310 if (ACPI_FAILURE(status)) { 311 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n")); 312 return -ENODEV; 313 } 314 315 arg0.integer.value = mode; 316 317 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL); 318 if (ACPI_FAILURE(status)) 319 return -ENODEV; 320 321 return 0; 322 } 323 324 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) 325 { 326 acpi_status status = AE_OK; 327 int i = 0; 328 329 330 if (!tz) 331 return -EINVAL; 332 333 /* Critical Shutdown (required) */ 334 335 status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL, 336 &tz->trips.critical.temperature); 337 if (ACPI_FAILURE(status)) { 338 tz->trips.critical.flags.valid = 0; 339 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold")); 340 return -ENODEV; 341 } else { 342 tz->trips.critical.flags.valid = 1; 343 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 344 "Found critical threshold [%lu]\n", 345 tz->trips.critical.temperature)); 346 } 347 348 if (tz->trips.critical.flags.valid == 1) { 349 if (crt == -1) { 350 tz->trips.critical.flags.valid = 0; 351 } else if (crt > 0) { 352 unsigned long crt_k = CELSIUS_TO_KELVIN(crt); 353 354 /* 355 * Allow override to lower critical threshold 356 */ 357 if (crt_k < tz->trips.critical.temperature) 358 tz->trips.critical.temperature = crt_k; 359 } 360 } 361 362 /* Critical Sleep (optional) */ 363 364 status = 365 acpi_evaluate_integer(tz->device->handle, "_HOT", NULL, 366 &tz->trips.hot.temperature); 367 if (ACPI_FAILURE(status)) { 368 tz->trips.hot.flags.valid = 0; 369 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n")); 370 } else { 371 tz->trips.hot.flags.valid = 1; 372 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n", 373 tz->trips.hot.temperature)); 374 } 375 376 /* Passive: Processors (optional) */ 377 378 if (psv == -1) { 379 status = AE_SUPPORT; 380 } else if (psv > 0) { 381 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv); 382 status = AE_OK; 383 } else { 384 status = acpi_evaluate_integer(tz->device->handle, 385 "_PSV", NULL, &tz->trips.passive.temperature); 386 } 387 388 if (ACPI_FAILURE(status)) { 389 tz->trips.passive.flags.valid = 0; 390 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n")); 391 } else { 392 tz->trips.passive.flags.valid = 1; 393 394 status = 395 acpi_evaluate_integer(tz->device->handle, "_TC1", NULL, 396 &tz->trips.passive.tc1); 397 if (ACPI_FAILURE(status)) 398 tz->trips.passive.flags.valid = 0; 399 400 status = 401 acpi_evaluate_integer(tz->device->handle, "_TC2", NULL, 402 &tz->trips.passive.tc2); 403 if (ACPI_FAILURE(status)) 404 tz->trips.passive.flags.valid = 0; 405 406 status = 407 acpi_evaluate_integer(tz->device->handle, "_TSP", NULL, 408 &tz->trips.passive.tsp); 409 if (ACPI_FAILURE(status)) 410 tz->trips.passive.flags.valid = 0; 411 412 status = 413 acpi_evaluate_reference(tz->device->handle, "_PSL", NULL, 414 &tz->trips.passive.devices); 415 if (ACPI_FAILURE(status)) 416 tz->trips.passive.flags.valid = 0; 417 418 if (!tz->trips.passive.flags.valid) 419 printk(KERN_WARNING PREFIX "Invalid passive threshold\n"); 420 else 421 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 422 "Found passive threshold [%lu]\n", 423 tz->trips.passive.temperature)); 424 } 425 426 /* Active: Fans, etc. (optional) */ 427 428 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 429 430 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; 431 432 if (act == -1) 433 break; /* disable all active trip points */ 434 435 status = acpi_evaluate_integer(tz->device->handle, 436 name, NULL, &tz->trips.active[i].temperature); 437 438 if (ACPI_FAILURE(status)) { 439 if (i == 0) /* no active trip points */ 440 break; 441 if (act <= 0) /* no override requested */ 442 break; 443 if (i == 1) { /* 1 trip point */ 444 tz->trips.active[0].temperature = 445 CELSIUS_TO_KELVIN(act); 446 } else { /* multiple trips */ 447 /* 448 * Don't allow override higher than 449 * the next higher trip point 450 */ 451 tz->trips.active[i - 1].temperature = 452 (tz->trips.active[i - 2].temperature < 453 CELSIUS_TO_KELVIN(act) ? 454 tz->trips.active[i - 2].temperature : 455 CELSIUS_TO_KELVIN(act)); 456 } 457 break; 458 } 459 460 name[2] = 'L'; 461 status = 462 acpi_evaluate_reference(tz->device->handle, name, NULL, 463 &tz->trips.active[i].devices); 464 if (ACPI_SUCCESS(status)) { 465 tz->trips.active[i].flags.valid = 1; 466 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 467 "Found active threshold [%d]:[%lu]\n", 468 i, tz->trips.active[i].temperature)); 469 } else 470 ACPI_EXCEPTION((AE_INFO, status, 471 "Invalid active threshold [%d]", i)); 472 } 473 474 return 0; 475 } 476 477 static int acpi_thermal_get_devices(struct acpi_thermal *tz) 478 { 479 acpi_status status = AE_OK; 480 481 482 if (!tz) 483 return -EINVAL; 484 485 status = 486 acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices); 487 if (ACPI_FAILURE(status)) 488 return -ENODEV; 489 490 return 0; 491 } 492 493 static int acpi_thermal_critical(struct acpi_thermal *tz) 494 { 495 if (!tz || !tz->trips.critical.flags.valid || nocrt) 496 return -EINVAL; 497 498 if (tz->temperature >= tz->trips.critical.temperature) { 499 printk(KERN_WARNING PREFIX "Critical trip point\n"); 500 tz->trips.critical.flags.enabled = 1; 501 } else if (tz->trips.critical.flags.enabled) 502 tz->trips.critical.flags.enabled = 0; 503 504 printk(KERN_EMERG 505 "Critical temperature reached (%ld C), shutting down.\n", 506 KELVIN_TO_CELSIUS(tz->temperature)); 507 acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL, 508 tz->trips.critical.flags.enabled); 509 acpi_bus_generate_netlink_event(tz->device->pnp.device_class, 510 tz->device->dev.bus_id, 511 ACPI_THERMAL_NOTIFY_CRITICAL, 512 tz->trips.critical.flags.enabled); 513 514 orderly_poweroff(true); 515 516 return 0; 517 } 518 519 static int acpi_thermal_hot(struct acpi_thermal *tz) 520 { 521 if (!tz || !tz->trips.hot.flags.valid || nocrt) 522 return -EINVAL; 523 524 if (tz->temperature >= tz->trips.hot.temperature) { 525 printk(KERN_WARNING PREFIX "Hot trip point\n"); 526 tz->trips.hot.flags.enabled = 1; 527 } else if (tz->trips.hot.flags.enabled) 528 tz->trips.hot.flags.enabled = 0; 529 530 acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT, 531 tz->trips.hot.flags.enabled); 532 acpi_bus_generate_netlink_event(tz->device->pnp.device_class, 533 tz->device->dev.bus_id, 534 ACPI_THERMAL_NOTIFY_HOT, 535 tz->trips.hot.flags.enabled); 536 537 /* TBD: Call user-mode "sleep(S4)" function */ 538 539 return 0; 540 } 541 542 static void acpi_thermal_passive(struct acpi_thermal *tz) 543 { 544 int result = 1; 545 struct acpi_thermal_passive *passive = NULL; 546 int trend = 0; 547 int i = 0; 548 549 550 if (!tz || !tz->trips.passive.flags.valid) 551 return; 552 553 passive = &(tz->trips.passive); 554 555 /* 556 * Above Trip? 557 * ----------- 558 * Calculate the thermal trend (using the passive cooling equation) 559 * and modify the performance limit for all passive cooling devices 560 * accordingly. Note that we assume symmetry. 561 */ 562 if (tz->temperature >= passive->temperature) { 563 trend = 564 (passive->tc1 * (tz->temperature - tz->last_temperature)) + 565 (passive->tc2 * (tz->temperature - passive->temperature)); 566 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 567 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n", 568 trend, passive->tc1, tz->temperature, 569 tz->last_temperature, passive->tc2, 570 tz->temperature, passive->temperature)); 571 passive->flags.enabled = 1; 572 /* Heating up? */ 573 if (trend > 0) 574 for (i = 0; i < passive->devices.count; i++) 575 acpi_processor_set_thermal_limit(passive-> 576 devices. 577 handles[i], 578 ACPI_PROCESSOR_LIMIT_INCREMENT); 579 /* Cooling off? */ 580 else if (trend < 0) { 581 for (i = 0; i < passive->devices.count; i++) 582 /* 583 * assume that we are on highest 584 * freq/lowest thrott and can leave 585 * passive mode, even in error case 586 */ 587 if (!acpi_processor_set_thermal_limit 588 (passive->devices.handles[i], 589 ACPI_PROCESSOR_LIMIT_DECREMENT)) 590 result = 0; 591 /* 592 * Leave cooling mode, even if the temp might 593 * higher than trip point This is because some 594 * machines might have long thermal polling 595 * frequencies (tsp) defined. We will fall back 596 * into passive mode in next cycle (probably quicker) 597 */ 598 if (result) { 599 passive->flags.enabled = 0; 600 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 601 "Disabling passive cooling, still above threshold," 602 " but we are cooling down\n")); 603 } 604 } 605 return; 606 } 607 608 /* 609 * Below Trip? 610 * ----------- 611 * Implement passive cooling hysteresis to slowly increase performance 612 * and avoid thrashing around the passive trip point. Note that we 613 * assume symmetry. 614 */ 615 if (!passive->flags.enabled) 616 return; 617 for (i = 0; i < passive->devices.count; i++) 618 if (!acpi_processor_set_thermal_limit 619 (passive->devices.handles[i], 620 ACPI_PROCESSOR_LIMIT_DECREMENT)) 621 result = 0; 622 if (result) { 623 passive->flags.enabled = 0; 624 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 625 "Disabling passive cooling (zone is cool)\n")); 626 } 627 } 628 629 static void acpi_thermal_active(struct acpi_thermal *tz) 630 { 631 int result = 0; 632 struct acpi_thermal_active *active = NULL; 633 int i = 0; 634 int j = 0; 635 unsigned long maxtemp = 0; 636 637 638 if (!tz) 639 return; 640 641 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 642 active = &(tz->trips.active[i]); 643 if (!active || !active->flags.valid) 644 break; 645 if (tz->temperature >= active->temperature) { 646 /* 647 * Above Threshold? 648 * ---------------- 649 * If not already enabled, turn ON all cooling devices 650 * associated with this active threshold. 651 */ 652 if (active->temperature > maxtemp) 653 tz->state.active_index = i; 654 maxtemp = active->temperature; 655 if (active->flags.enabled) 656 continue; 657 for (j = 0; j < active->devices.count; j++) { 658 result = 659 acpi_bus_set_power(active->devices. 660 handles[j], 661 ACPI_STATE_D0); 662 if (result) { 663 printk(KERN_WARNING PREFIX 664 "Unable to turn cooling device [%p] 'on'\n", 665 active->devices. 666 handles[j]); 667 continue; 668 } 669 active->flags.enabled = 1; 670 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 671 "Cooling device [%p] now 'on'\n", 672 active->devices.handles[j])); 673 } 674 continue; 675 } 676 if (!active->flags.enabled) 677 continue; 678 /* 679 * Below Threshold? 680 * ---------------- 681 * Turn OFF all cooling devices associated with this 682 * threshold. 683 */ 684 for (j = 0; j < active->devices.count; j++) { 685 result = acpi_bus_set_power(active->devices.handles[j], 686 ACPI_STATE_D3); 687 if (result) { 688 printk(KERN_WARNING PREFIX 689 "Unable to turn cooling device [%p] 'off'\n", 690 active->devices.handles[j]); 691 continue; 692 } 693 active->flags.enabled = 0; 694 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 695 "Cooling device [%p] now 'off'\n", 696 active->devices.handles[j])); 697 } 698 } 699 } 700 701 static void acpi_thermal_check(void *context); 702 703 static void acpi_thermal_run(unsigned long data) 704 { 705 struct acpi_thermal *tz = (struct acpi_thermal *)data; 706 if (!tz->zombie) 707 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data); 708 } 709 710 static void acpi_thermal_check(void *data) 711 { 712 int result = 0; 713 struct acpi_thermal *tz = data; 714 unsigned long sleep_time = 0; 715 unsigned long timeout_jiffies = 0; 716 int i = 0; 717 struct acpi_thermal_state state; 718 719 720 if (!tz) { 721 printk(KERN_ERR PREFIX "Invalid (NULL) context\n"); 722 return; 723 } 724 725 /* Check if someone else is already running */ 726 if (!mutex_trylock(&tz->lock)) 727 return; 728 729 state = tz->state; 730 731 result = acpi_thermal_get_temperature(tz); 732 if (result) 733 goto unlock; 734 735 memset(&tz->state, 0, sizeof(tz->state)); 736 737 /* 738 * Check Trip Points 739 * ----------------- 740 * Compare the current temperature to the trip point values to see 741 * if we've entered one of the thermal policy states. Note that 742 * this function determines when a state is entered, but the 743 * individual policy decides when it is exited (e.g. hysteresis). 744 */ 745 if (tz->trips.critical.flags.valid) 746 state.critical |= 747 (tz->temperature >= tz->trips.critical.temperature); 748 if (tz->trips.hot.flags.valid) 749 state.hot |= (tz->temperature >= tz->trips.hot.temperature); 750 if (tz->trips.passive.flags.valid) 751 state.passive |= 752 (tz->temperature >= tz->trips.passive.temperature); 753 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) 754 if (tz->trips.active[i].flags.valid) 755 state.active |= 756 (tz->temperature >= 757 tz->trips.active[i].temperature); 758 759 /* 760 * Invoke Policy 761 * ------------- 762 * Separated from the above check to allow individual policy to 763 * determine when to exit a given state. 764 */ 765 if (state.critical) 766 acpi_thermal_critical(tz); 767 if (state.hot) 768 acpi_thermal_hot(tz); 769 if (state.passive) 770 acpi_thermal_passive(tz); 771 if (state.active) 772 acpi_thermal_active(tz); 773 774 /* 775 * Calculate State 776 * --------------- 777 * Again, separated from the above two to allow independent policy 778 * decisions. 779 */ 780 tz->state.critical = tz->trips.critical.flags.enabled; 781 tz->state.hot = tz->trips.hot.flags.enabled; 782 tz->state.passive = tz->trips.passive.flags.enabled; 783 tz->state.active = 0; 784 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) 785 tz->state.active |= tz->trips.active[i].flags.enabled; 786 787 /* 788 * Calculate Sleep Time 789 * -------------------- 790 * If we're in the passive state, use _TSP's value. Otherwise 791 * use the default polling frequency (e.g. _TZP). If no polling 792 * frequency is specified then we'll wait forever (at least until 793 * a thermal event occurs). Note that _TSP and _TZD values are 794 * given in 1/10th seconds (we must covert to milliseconds). 795 */ 796 if (tz->state.passive) { 797 sleep_time = tz->trips.passive.tsp * 100; 798 timeout_jiffies = jiffies + (HZ * sleep_time) / 1000; 799 } else if (tz->polling_frequency > 0) { 800 sleep_time = tz->polling_frequency * 100; 801 timeout_jiffies = round_jiffies(jiffies + (HZ * sleep_time) / 1000); 802 } 803 804 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n", 805 tz->name, tz->temperature, sleep_time)); 806 807 /* 808 * Schedule Next Poll 809 * ------------------ 810 */ 811 if (!sleep_time) { 812 if (timer_pending(&(tz->timer))) 813 del_timer(&(tz->timer)); 814 } else { 815 if (timer_pending(&(tz->timer))) 816 mod_timer(&(tz->timer), timeout_jiffies); 817 else { 818 tz->timer.data = (unsigned long)tz; 819 tz->timer.function = acpi_thermal_run; 820 tz->timer.expires = timeout_jiffies; 821 add_timer(&(tz->timer)); 822 } 823 } 824 unlock: 825 mutex_unlock(&tz->lock); 826 } 827 828 /* -------------------------------------------------------------------------- 829 FS Interface (/proc) 830 -------------------------------------------------------------------------- */ 831 832 static struct proc_dir_entry *acpi_thermal_dir; 833 834 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset) 835 { 836 struct acpi_thermal *tz = seq->private; 837 838 839 if (!tz) 840 goto end; 841 842 seq_puts(seq, "state: "); 843 844 if (!tz->state.critical && !tz->state.hot && !tz->state.passive 845 && !tz->state.active) 846 seq_puts(seq, "ok\n"); 847 else { 848 if (tz->state.critical) 849 seq_puts(seq, "critical "); 850 if (tz->state.hot) 851 seq_puts(seq, "hot "); 852 if (tz->state.passive) 853 seq_puts(seq, "passive "); 854 if (tz->state.active) 855 seq_printf(seq, "active[%d]", tz->state.active_index); 856 seq_puts(seq, "\n"); 857 } 858 859 end: 860 return 0; 861 } 862 863 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file) 864 { 865 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data); 866 } 867 868 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset) 869 { 870 int result = 0; 871 struct acpi_thermal *tz = seq->private; 872 873 874 if (!tz) 875 goto end; 876 877 result = acpi_thermal_get_temperature(tz); 878 if (result) 879 goto end; 880 881 seq_printf(seq, "temperature: %ld C\n", 882 KELVIN_TO_CELSIUS(tz->temperature)); 883 884 end: 885 return 0; 886 } 887 888 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file) 889 { 890 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data); 891 } 892 893 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset) 894 { 895 struct acpi_thermal *tz = seq->private; 896 struct acpi_device *device; 897 acpi_status status; 898 899 int i = 0; 900 int j = 0; 901 902 903 if (!tz) 904 goto end; 905 906 if (tz->trips.critical.flags.valid) 907 seq_printf(seq, "critical (S5): %ld C%s", 908 KELVIN_TO_CELSIUS(tz->trips.critical.temperature), 909 nocrt ? " <disabled>\n" : "\n"); 910 911 if (tz->trips.hot.flags.valid) 912 seq_printf(seq, "hot (S4): %ld C%s", 913 KELVIN_TO_CELSIUS(tz->trips.hot.temperature), 914 nocrt ? " <disabled>\n" : "\n"); 915 916 if (tz->trips.passive.flags.valid) { 917 seq_printf(seq, 918 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=", 919 KELVIN_TO_CELSIUS(tz->trips.passive.temperature), 920 tz->trips.passive.tc1, tz->trips.passive.tc2, 921 tz->trips.passive.tsp); 922 for (j = 0; j < tz->trips.passive.devices.count; j++) { 923 status = acpi_bus_get_device(tz->trips.passive.devices. 924 handles[j], &device); 925 seq_printf(seq, "%4.4s ", status ? "" : 926 acpi_device_bid(device)); 927 } 928 seq_puts(seq, "\n"); 929 } 930 931 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 932 if (!(tz->trips.active[i].flags.valid)) 933 break; 934 seq_printf(seq, "active[%d]: %ld C: devices=", 935 i, 936 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature)); 937 for (j = 0; j < tz->trips.active[i].devices.count; j++){ 938 status = acpi_bus_get_device(tz->trips.active[i]. 939 devices.handles[j], 940 &device); 941 seq_printf(seq, "%4.4s ", status ? "" : 942 acpi_device_bid(device)); 943 } 944 seq_puts(seq, "\n"); 945 } 946 947 end: 948 return 0; 949 } 950 951 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file) 952 { 953 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data); 954 } 955 956 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset) 957 { 958 struct acpi_thermal *tz = seq->private; 959 960 961 if (!tz) 962 goto end; 963 964 if (!tz->flags.cooling_mode) 965 seq_puts(seq, "<setting not supported>\n"); 966 else 967 seq_puts(seq, "0 - Active; 1 - Passive\n"); 968 969 end: 970 return 0; 971 } 972 973 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file) 974 { 975 return single_open(file, acpi_thermal_cooling_seq_show, 976 PDE(inode)->data); 977 } 978 979 static ssize_t 980 acpi_thermal_write_cooling_mode(struct file *file, 981 const char __user * buffer, 982 size_t count, loff_t * ppos) 983 { 984 struct seq_file *m = file->private_data; 985 struct acpi_thermal *tz = m->private; 986 int result = 0; 987 char mode_string[12] = { '\0' }; 988 989 990 if (!tz || (count > sizeof(mode_string) - 1)) 991 return -EINVAL; 992 993 if (!tz->flags.cooling_mode) 994 return -ENODEV; 995 996 if (copy_from_user(mode_string, buffer, count)) 997 return -EFAULT; 998 999 mode_string[count] = '\0'; 1000 1001 result = acpi_thermal_set_cooling_mode(tz, 1002 simple_strtoul(mode_string, NULL, 1003 0)); 1004 if (result) 1005 return result; 1006 1007 acpi_thermal_check(tz); 1008 1009 return count; 1010 } 1011 1012 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset) 1013 { 1014 struct acpi_thermal *tz = seq->private; 1015 1016 1017 if (!tz) 1018 goto end; 1019 1020 if (!tz->polling_frequency) { 1021 seq_puts(seq, "<polling disabled>\n"); 1022 goto end; 1023 } 1024 1025 seq_printf(seq, "polling frequency: %lu seconds\n", 1026 (tz->polling_frequency / 10)); 1027 1028 end: 1029 return 0; 1030 } 1031 1032 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file) 1033 { 1034 return single_open(file, acpi_thermal_polling_seq_show, 1035 PDE(inode)->data); 1036 } 1037 1038 static ssize_t 1039 acpi_thermal_write_polling(struct file *file, 1040 const char __user * buffer, 1041 size_t count, loff_t * ppos) 1042 { 1043 struct seq_file *m = file->private_data; 1044 struct acpi_thermal *tz = m->private; 1045 int result = 0; 1046 char polling_string[12] = { '\0' }; 1047 int seconds = 0; 1048 1049 1050 if (!tz || (count > sizeof(polling_string) - 1)) 1051 return -EINVAL; 1052 1053 if (copy_from_user(polling_string, buffer, count)) 1054 return -EFAULT; 1055 1056 polling_string[count] = '\0'; 1057 1058 seconds = simple_strtoul(polling_string, NULL, 0); 1059 1060 result = acpi_thermal_set_polling(tz, seconds); 1061 if (result) 1062 return result; 1063 1064 acpi_thermal_check(tz); 1065 1066 return count; 1067 } 1068 1069 static int acpi_thermal_add_fs(struct acpi_device *device) 1070 { 1071 struct proc_dir_entry *entry = NULL; 1072 1073 1074 if (!acpi_device_dir(device)) { 1075 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 1076 acpi_thermal_dir); 1077 if (!acpi_device_dir(device)) 1078 return -ENODEV; 1079 acpi_device_dir(device)->owner = THIS_MODULE; 1080 } 1081 1082 /* 'state' [R] */ 1083 entry = create_proc_entry(ACPI_THERMAL_FILE_STATE, 1084 S_IRUGO, acpi_device_dir(device)); 1085 if (!entry) 1086 return -ENODEV; 1087 else { 1088 entry->proc_fops = &acpi_thermal_state_fops; 1089 entry->data = acpi_driver_data(device); 1090 entry->owner = THIS_MODULE; 1091 } 1092 1093 /* 'temperature' [R] */ 1094 entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE, 1095 S_IRUGO, acpi_device_dir(device)); 1096 if (!entry) 1097 return -ENODEV; 1098 else { 1099 entry->proc_fops = &acpi_thermal_temp_fops; 1100 entry->data = acpi_driver_data(device); 1101 entry->owner = THIS_MODULE; 1102 } 1103 1104 /* 'trip_points' [R] */ 1105 entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS, 1106 S_IRUGO, 1107 acpi_device_dir(device)); 1108 if (!entry) 1109 return -ENODEV; 1110 else { 1111 entry->proc_fops = &acpi_thermal_trip_fops; 1112 entry->data = acpi_driver_data(device); 1113 entry->owner = THIS_MODULE; 1114 } 1115 1116 /* 'cooling_mode' [R/W] */ 1117 entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE, 1118 S_IFREG | S_IRUGO | S_IWUSR, 1119 acpi_device_dir(device)); 1120 if (!entry) 1121 return -ENODEV; 1122 else { 1123 entry->proc_fops = &acpi_thermal_cooling_fops; 1124 entry->data = acpi_driver_data(device); 1125 entry->owner = THIS_MODULE; 1126 } 1127 1128 /* 'polling_frequency' [R/W] */ 1129 entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ, 1130 S_IFREG | S_IRUGO | S_IWUSR, 1131 acpi_device_dir(device)); 1132 if (!entry) 1133 return -ENODEV; 1134 else { 1135 entry->proc_fops = &acpi_thermal_polling_fops; 1136 entry->data = acpi_driver_data(device); 1137 entry->owner = THIS_MODULE; 1138 } 1139 1140 return 0; 1141 } 1142 1143 static int acpi_thermal_remove_fs(struct acpi_device *device) 1144 { 1145 1146 if (acpi_device_dir(device)) { 1147 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ, 1148 acpi_device_dir(device)); 1149 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE, 1150 acpi_device_dir(device)); 1151 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS, 1152 acpi_device_dir(device)); 1153 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE, 1154 acpi_device_dir(device)); 1155 remove_proc_entry(ACPI_THERMAL_FILE_STATE, 1156 acpi_device_dir(device)); 1157 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir); 1158 acpi_device_dir(device) = NULL; 1159 } 1160 1161 return 0; 1162 } 1163 1164 /* -------------------------------------------------------------------------- 1165 Driver Interface 1166 -------------------------------------------------------------------------- */ 1167 1168 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data) 1169 { 1170 struct acpi_thermal *tz = data; 1171 struct acpi_device *device = NULL; 1172 1173 1174 if (!tz) 1175 return; 1176 1177 device = tz->device; 1178 1179 switch (event) { 1180 case ACPI_THERMAL_NOTIFY_TEMPERATURE: 1181 acpi_thermal_check(tz); 1182 break; 1183 case ACPI_THERMAL_NOTIFY_THRESHOLDS: 1184 acpi_thermal_get_trip_points(tz); 1185 acpi_thermal_check(tz); 1186 acpi_bus_generate_proc_event(device, event, 0); 1187 acpi_bus_generate_netlink_event(device->pnp.device_class, 1188 device->dev.bus_id, event, 0); 1189 break; 1190 case ACPI_THERMAL_NOTIFY_DEVICES: 1191 if (tz->flags.devices) 1192 acpi_thermal_get_devices(tz); 1193 acpi_bus_generate_proc_event(device, event, 0); 1194 acpi_bus_generate_netlink_event(device->pnp.device_class, 1195 device->dev.bus_id, event, 0); 1196 break; 1197 default: 1198 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1199 "Unsupported event [0x%x]\n", event)); 1200 break; 1201 } 1202 1203 return; 1204 } 1205 1206 static int acpi_thermal_get_info(struct acpi_thermal *tz) 1207 { 1208 int result = 0; 1209 1210 1211 if (!tz) 1212 return -EINVAL; 1213 1214 /* Get temperature [_TMP] (required) */ 1215 result = acpi_thermal_get_temperature(tz); 1216 if (result) 1217 return result; 1218 1219 /* Get trip points [_CRT, _PSV, etc.] (required) */ 1220 result = acpi_thermal_get_trip_points(tz); 1221 if (result) 1222 return result; 1223 1224 /* Set the cooling mode [_SCP] to active cooling (default) */ 1225 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE); 1226 if (!result) 1227 tz->flags.cooling_mode = 1; 1228 1229 /* Get default polling frequency [_TZP] (optional) */ 1230 if (tzp) 1231 tz->polling_frequency = tzp; 1232 else 1233 acpi_thermal_get_polling_frequency(tz); 1234 1235 /* Get devices in this thermal zone [_TZD] (optional) */ 1236 result = acpi_thermal_get_devices(tz); 1237 if (!result) 1238 tz->flags.devices = 1; 1239 1240 return 0; 1241 } 1242 1243 static int acpi_thermal_add(struct acpi_device *device) 1244 { 1245 int result = 0; 1246 acpi_status status = AE_OK; 1247 struct acpi_thermal *tz = NULL; 1248 1249 1250 if (!device) 1251 return -EINVAL; 1252 1253 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL); 1254 if (!tz) 1255 return -ENOMEM; 1256 1257 tz->device = device; 1258 strcpy(tz->name, device->pnp.bus_id); 1259 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME); 1260 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS); 1261 acpi_driver_data(device) = tz; 1262 mutex_init(&tz->lock); 1263 result = acpi_thermal_get_info(tz); 1264 if (result) 1265 goto end; 1266 1267 result = acpi_thermal_add_fs(device); 1268 if (result) 1269 goto end; 1270 1271 init_timer(&tz->timer); 1272 1273 acpi_thermal_check(tz); 1274 1275 status = acpi_install_notify_handler(device->handle, 1276 ACPI_DEVICE_NOTIFY, 1277 acpi_thermal_notify, tz); 1278 if (ACPI_FAILURE(status)) { 1279 result = -ENODEV; 1280 goto end; 1281 } 1282 1283 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n", 1284 acpi_device_name(device), acpi_device_bid(device), 1285 KELVIN_TO_CELSIUS(tz->temperature)); 1286 1287 end: 1288 if (result) { 1289 acpi_thermal_remove_fs(device); 1290 kfree(tz); 1291 } 1292 1293 return result; 1294 } 1295 1296 static int acpi_thermal_remove(struct acpi_device *device, int type) 1297 { 1298 acpi_status status = AE_OK; 1299 struct acpi_thermal *tz = NULL; 1300 1301 1302 if (!device || !acpi_driver_data(device)) 1303 return -EINVAL; 1304 1305 tz = acpi_driver_data(device); 1306 1307 /* avoid timer adding new defer task */ 1308 tz->zombie = 1; 1309 /* wait for running timer (on other CPUs) finish */ 1310 del_timer_sync(&(tz->timer)); 1311 /* synchronize deferred task */ 1312 acpi_os_wait_events_complete(NULL); 1313 /* deferred task may reinsert timer */ 1314 del_timer_sync(&(tz->timer)); 1315 1316 status = acpi_remove_notify_handler(device->handle, 1317 ACPI_DEVICE_NOTIFY, 1318 acpi_thermal_notify); 1319 1320 /* Terminate policy */ 1321 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) { 1322 tz->trips.passive.flags.enabled = 0; 1323 acpi_thermal_passive(tz); 1324 } 1325 if (tz->trips.active[0].flags.valid 1326 && tz->trips.active[0].flags.enabled) { 1327 tz->trips.active[0].flags.enabled = 0; 1328 acpi_thermal_active(tz); 1329 } 1330 1331 acpi_thermal_remove_fs(device); 1332 mutex_destroy(&tz->lock); 1333 kfree(tz); 1334 return 0; 1335 } 1336 1337 static int acpi_thermal_resume(struct acpi_device *device) 1338 { 1339 struct acpi_thermal *tz = NULL; 1340 int i, j, power_state, result; 1341 1342 1343 if (!device || !acpi_driver_data(device)) 1344 return -EINVAL; 1345 1346 tz = acpi_driver_data(device); 1347 1348 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1349 if (!(&tz->trips.active[i])) 1350 break; 1351 if (!tz->trips.active[i].flags.valid) 1352 break; 1353 tz->trips.active[i].flags.enabled = 1; 1354 for (j = 0; j < tz->trips.active[i].devices.count; j++) { 1355 result = acpi_bus_get_power(tz->trips.active[i].devices. 1356 handles[j], &power_state); 1357 if (result || (power_state != ACPI_STATE_D0)) { 1358 tz->trips.active[i].flags.enabled = 0; 1359 break; 1360 } 1361 } 1362 tz->state.active |= tz->trips.active[i].flags.enabled; 1363 } 1364 1365 acpi_thermal_check(tz); 1366 1367 return AE_OK; 1368 } 1369 1370 #ifdef CONFIG_DMI 1371 static int thermal_act(const struct dmi_system_id *d) { 1372 1373 if (act == 0) { 1374 printk(KERN_NOTICE "ACPI: %s detected: " 1375 "disabling all active thermal trip points\n", d->ident); 1376 act = -1; 1377 } 1378 return 0; 1379 } 1380 static int thermal_nocrt(const struct dmi_system_id *d) { 1381 1382 printk(KERN_NOTICE "ACPI: %s detected: " 1383 "disabling all critical thermal trip point actions.\n", d->ident); 1384 nocrt = 1; 1385 return 0; 1386 } 1387 static int thermal_tzp(const struct dmi_system_id *d) { 1388 1389 if (tzp == 0) { 1390 printk(KERN_NOTICE "ACPI: %s detected: " 1391 "enabling thermal zone polling\n", d->ident); 1392 tzp = 300; /* 300 dS = 30 Seconds */ 1393 } 1394 return 0; 1395 } 1396 static int thermal_psv(const struct dmi_system_id *d) { 1397 1398 if (psv == 0) { 1399 printk(KERN_NOTICE "ACPI: %s detected: " 1400 "disabling all passive thermal trip points\n", d->ident); 1401 psv = -1; 1402 } 1403 return 0; 1404 } 1405 1406 static struct dmi_system_id thermal_dmi_table[] __initdata = { 1407 /* 1408 * Award BIOS on this AOpen makes thermal control almost worthless. 1409 * http://bugzilla.kernel.org/show_bug.cgi?id=8842 1410 */ 1411 { 1412 .callback = thermal_act, 1413 .ident = "AOpen i915GMm-HFS", 1414 .matches = { 1415 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1416 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1417 }, 1418 }, 1419 { 1420 .callback = thermal_psv, 1421 .ident = "AOpen i915GMm-HFS", 1422 .matches = { 1423 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1424 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1425 }, 1426 }, 1427 { 1428 .callback = thermal_tzp, 1429 .ident = "AOpen i915GMm-HFS", 1430 .matches = { 1431 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1432 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1433 }, 1434 }, 1435 { 1436 .callback = thermal_nocrt, 1437 .ident = "Gigabyte GA-7ZX", 1438 .matches = { 1439 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."), 1440 DMI_MATCH(DMI_BOARD_NAME, "7ZX"), 1441 }, 1442 }, 1443 {} 1444 }; 1445 #endif /* CONFIG_DMI */ 1446 1447 static int __init acpi_thermal_init(void) 1448 { 1449 int result = 0; 1450 1451 dmi_check_system(thermal_dmi_table); 1452 1453 if (off) { 1454 printk(KERN_NOTICE "ACPI: thermal control disabled\n"); 1455 return -ENODEV; 1456 } 1457 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir); 1458 if (!acpi_thermal_dir) 1459 return -ENODEV; 1460 acpi_thermal_dir->owner = THIS_MODULE; 1461 1462 result = acpi_bus_register_driver(&acpi_thermal_driver); 1463 if (result < 0) { 1464 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir); 1465 return -ENODEV; 1466 } 1467 1468 return 0; 1469 } 1470 1471 static void __exit acpi_thermal_exit(void) 1472 { 1473 1474 acpi_bus_unregister_driver(&acpi_thermal_driver); 1475 1476 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir); 1477 1478 return; 1479 } 1480 1481 module_init(acpi_thermal_init); 1482 module_exit(acpi_thermal_exit); 1483