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/jiffies.h> 41 #include <linux/kmod.h> 42 #include <linux/seq_file.h> 43 #include <linux/reboot.h> 44 #include <linux/device.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 PREFIX "ACPI: " 51 52 #define ACPI_THERMAL_CLASS "thermal_zone" 53 #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone" 54 #define ACPI_THERMAL_FILE_STATE "state" 55 #define ACPI_THERMAL_FILE_TEMPERATURE "temperature" 56 #define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points" 57 #define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode" 58 #define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency" 59 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80 60 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81 61 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82 62 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0 63 #define ACPI_THERMAL_NOTIFY_HOT 0xF1 64 #define ACPI_THERMAL_MODE_ACTIVE 0x00 65 66 #define ACPI_THERMAL_MAX_ACTIVE 10 67 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65 68 69 #define _COMPONENT ACPI_THERMAL_COMPONENT 70 ACPI_MODULE_NAME("thermal"); 71 72 MODULE_AUTHOR("Paul Diefenbaugh"); 73 MODULE_DESCRIPTION("ACPI Thermal Zone Driver"); 74 MODULE_LICENSE("GPL"); 75 76 static int act; 77 module_param(act, int, 0644); 78 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points."); 79 80 static int crt; 81 module_param(crt, int, 0644); 82 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points."); 83 84 static int tzp; 85 module_param(tzp, int, 0444); 86 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds."); 87 88 static int nocrt; 89 module_param(nocrt, int, 0); 90 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points."); 91 92 static int off; 93 module_param(off, int, 0); 94 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support."); 95 96 static int psv; 97 module_param(psv, int, 0644); 98 MODULE_PARM_DESC(psv, "Disable or override all passive trip points."); 99 100 static int acpi_thermal_add(struct acpi_device *device); 101 static int acpi_thermal_remove(struct acpi_device *device, int type); 102 static int acpi_thermal_resume(struct acpi_device *device); 103 static void acpi_thermal_notify(struct acpi_device *device, u32 event); 104 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file); 105 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file); 106 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file); 107 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file); 108 static ssize_t acpi_thermal_write_cooling_mode(struct file *, 109 const char __user *, size_t, 110 loff_t *); 111 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file); 112 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *, 113 size_t, loff_t *); 114 115 static const struct acpi_device_id thermal_device_ids[] = { 116 {ACPI_THERMAL_HID, 0}, 117 {"", 0}, 118 }; 119 MODULE_DEVICE_TABLE(acpi, thermal_device_ids); 120 121 static struct acpi_driver acpi_thermal_driver = { 122 .name = "thermal", 123 .class = ACPI_THERMAL_CLASS, 124 .ids = thermal_device_ids, 125 .ops = { 126 .add = acpi_thermal_add, 127 .remove = acpi_thermal_remove, 128 .resume = acpi_thermal_resume, 129 .notify = acpi_thermal_notify, 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 thermal_zone_device *thermal_zone; 198 int tz_enabled; 199 int kelvin_offset; 200 struct mutex lock; 201 }; 202 203 static const struct file_operations acpi_thermal_state_fops = { 204 .owner = THIS_MODULE, 205 .open = acpi_thermal_state_open_fs, 206 .read = seq_read, 207 .llseek = seq_lseek, 208 .release = single_release, 209 }; 210 211 static const struct file_operations acpi_thermal_temp_fops = { 212 .owner = THIS_MODULE, 213 .open = acpi_thermal_temp_open_fs, 214 .read = seq_read, 215 .llseek = seq_lseek, 216 .release = single_release, 217 }; 218 219 static const struct file_operations acpi_thermal_trip_fops = { 220 .owner = THIS_MODULE, 221 .open = acpi_thermal_trip_open_fs, 222 .read = seq_read, 223 .llseek = seq_lseek, 224 .release = single_release, 225 }; 226 227 static const struct file_operations acpi_thermal_cooling_fops = { 228 .owner = THIS_MODULE, 229 .open = acpi_thermal_cooling_open_fs, 230 .read = seq_read, 231 .write = acpi_thermal_write_cooling_mode, 232 .llseek = seq_lseek, 233 .release = single_release, 234 }; 235 236 static const struct file_operations acpi_thermal_polling_fops = { 237 .owner = THIS_MODULE, 238 .open = acpi_thermal_polling_open_fs, 239 .read = seq_read, 240 .write = acpi_thermal_write_polling, 241 .llseek = seq_lseek, 242 .release = single_release, 243 }; 244 245 /* -------------------------------------------------------------------------- 246 Thermal Zone Management 247 -------------------------------------------------------------------------- */ 248 249 static int acpi_thermal_get_temperature(struct acpi_thermal *tz) 250 { 251 acpi_status status = AE_OK; 252 unsigned long long tmp; 253 254 if (!tz) 255 return -EINVAL; 256 257 tz->last_temperature = tz->temperature; 258 259 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp); 260 if (ACPI_FAILURE(status)) 261 return -ENODEV; 262 263 tz->temperature = tmp; 264 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n", 265 tz->temperature)); 266 267 return 0; 268 } 269 270 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz) 271 { 272 acpi_status status = AE_OK; 273 unsigned long long tmp; 274 275 if (!tz) 276 return -EINVAL; 277 278 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp); 279 if (ACPI_FAILURE(status)) 280 return -ENODEV; 281 282 tz->polling_frequency = tmp; 283 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n", 284 tz->polling_frequency)); 285 286 return 0; 287 } 288 289 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds) 290 { 291 292 if (!tz) 293 return -EINVAL; 294 295 tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */ 296 297 tz->thermal_zone->polling_delay = seconds * 1000; 298 299 if (tz->tz_enabled) 300 thermal_zone_device_update(tz->thermal_zone); 301 302 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 303 "Polling frequency set to %lu seconds\n", 304 tz->polling_frequency/10)); 305 306 return 0; 307 } 308 309 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode) 310 { 311 acpi_status status = AE_OK; 312 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 313 struct acpi_object_list arg_list = { 1, &arg0 }; 314 acpi_handle handle = NULL; 315 316 317 if (!tz) 318 return -EINVAL; 319 320 status = acpi_get_handle(tz->device->handle, "_SCP", &handle); 321 if (ACPI_FAILURE(status)) { 322 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n")); 323 return -ENODEV; 324 } 325 326 arg0.integer.value = mode; 327 328 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL); 329 if (ACPI_FAILURE(status)) 330 return -ENODEV; 331 332 return 0; 333 } 334 335 #define ACPI_TRIPS_CRITICAL 0x01 336 #define ACPI_TRIPS_HOT 0x02 337 #define ACPI_TRIPS_PASSIVE 0x04 338 #define ACPI_TRIPS_ACTIVE 0x08 339 #define ACPI_TRIPS_DEVICES 0x10 340 341 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE) 342 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES 343 344 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \ 345 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \ 346 ACPI_TRIPS_DEVICES) 347 348 /* 349 * This exception is thrown out in two cases: 350 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid 351 * when re-evaluating the AML code. 352 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change. 353 * We need to re-bind the cooling devices of a thermal zone when this occurs. 354 */ 355 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \ 356 do { \ 357 if (flags != ACPI_TRIPS_INIT) \ 358 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \ 359 "ACPI thermal trip point %s changed\n" \ 360 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \ 361 } while (0) 362 363 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag) 364 { 365 acpi_status status = AE_OK; 366 unsigned long long tmp; 367 struct acpi_handle_list devices; 368 int valid = 0; 369 int i; 370 371 /* Critical Shutdown (required) */ 372 if (flag & ACPI_TRIPS_CRITICAL) { 373 status = acpi_evaluate_integer(tz->device->handle, 374 "_CRT", NULL, &tmp); 375 tz->trips.critical.temperature = tmp; 376 /* 377 * Treat freezing temperatures as invalid as well; some 378 * BIOSes return really low values and cause reboots at startup. 379 * Below zero (Celsius) values clearly aren't right for sure.. 380 * ... so lets discard those as invalid. 381 */ 382 if (ACPI_FAILURE(status) || 383 tz->trips.critical.temperature <= 2732) { 384 tz->trips.critical.flags.valid = 0; 385 ACPI_EXCEPTION((AE_INFO, status, 386 "No or invalid critical threshold")); 387 return -ENODEV; 388 } else { 389 tz->trips.critical.flags.valid = 1; 390 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 391 "Found critical threshold [%lu]\n", 392 tz->trips.critical.temperature)); 393 } 394 if (tz->trips.critical.flags.valid == 1) { 395 if (crt == -1) { 396 tz->trips.critical.flags.valid = 0; 397 } else if (crt > 0) { 398 unsigned long crt_k = CELSIUS_TO_KELVIN(crt); 399 /* 400 * Allow override critical threshold 401 */ 402 if (crt_k > tz->trips.critical.temperature) 403 printk(KERN_WARNING PREFIX 404 "Critical threshold %d C\n", crt); 405 tz->trips.critical.temperature = crt_k; 406 } 407 } 408 } 409 410 /* Critical Sleep (optional) */ 411 if (flag & ACPI_TRIPS_HOT) { 412 status = acpi_evaluate_integer(tz->device->handle, 413 "_HOT", NULL, &tmp); 414 if (ACPI_FAILURE(status)) { 415 tz->trips.hot.flags.valid = 0; 416 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 417 "No hot threshold\n")); 418 } else { 419 tz->trips.hot.temperature = tmp; 420 tz->trips.hot.flags.valid = 1; 421 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 422 "Found hot threshold [%lu]\n", 423 tz->trips.critical.temperature)); 424 } 425 } 426 427 /* Passive (optional) */ 428 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) || 429 (flag == ACPI_TRIPS_INIT)) { 430 valid = tz->trips.passive.flags.valid; 431 if (psv == -1) { 432 status = AE_SUPPORT; 433 } else if (psv > 0) { 434 tmp = CELSIUS_TO_KELVIN(psv); 435 status = AE_OK; 436 } else { 437 status = acpi_evaluate_integer(tz->device->handle, 438 "_PSV", NULL, &tmp); 439 } 440 441 if (ACPI_FAILURE(status)) 442 tz->trips.passive.flags.valid = 0; 443 else { 444 tz->trips.passive.temperature = tmp; 445 tz->trips.passive.flags.valid = 1; 446 if (flag == ACPI_TRIPS_INIT) { 447 status = acpi_evaluate_integer( 448 tz->device->handle, "_TC1", 449 NULL, &tmp); 450 if (ACPI_FAILURE(status)) 451 tz->trips.passive.flags.valid = 0; 452 else 453 tz->trips.passive.tc1 = tmp; 454 status = acpi_evaluate_integer( 455 tz->device->handle, "_TC2", 456 NULL, &tmp); 457 if (ACPI_FAILURE(status)) 458 tz->trips.passive.flags.valid = 0; 459 else 460 tz->trips.passive.tc2 = tmp; 461 status = acpi_evaluate_integer( 462 tz->device->handle, "_TSP", 463 NULL, &tmp); 464 if (ACPI_FAILURE(status)) 465 tz->trips.passive.flags.valid = 0; 466 else 467 tz->trips.passive.tsp = tmp; 468 } 469 } 470 } 471 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) { 472 memset(&devices, 0, sizeof(struct acpi_handle_list)); 473 status = acpi_evaluate_reference(tz->device->handle, "_PSL", 474 NULL, &devices); 475 if (ACPI_FAILURE(status)) { 476 printk(KERN_WARNING PREFIX 477 "Invalid passive threshold\n"); 478 tz->trips.passive.flags.valid = 0; 479 } 480 else 481 tz->trips.passive.flags.valid = 1; 482 483 if (memcmp(&tz->trips.passive.devices, &devices, 484 sizeof(struct acpi_handle_list))) { 485 memcpy(&tz->trips.passive.devices, &devices, 486 sizeof(struct acpi_handle_list)); 487 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 488 } 489 } 490 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) { 491 if (valid != tz->trips.passive.flags.valid) 492 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state"); 493 } 494 495 /* Active (optional) */ 496 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 497 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; 498 valid = tz->trips.active[i].flags.valid; 499 500 if (act == -1) 501 break; /* disable all active trip points */ 502 503 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) && 504 tz->trips.active[i].flags.valid)) { 505 status = acpi_evaluate_integer(tz->device->handle, 506 name, NULL, &tmp); 507 if (ACPI_FAILURE(status)) { 508 tz->trips.active[i].flags.valid = 0; 509 if (i == 0) 510 break; 511 if (act <= 0) 512 break; 513 if (i == 1) 514 tz->trips.active[0].temperature = 515 CELSIUS_TO_KELVIN(act); 516 else 517 /* 518 * Don't allow override higher than 519 * the next higher trip point 520 */ 521 tz->trips.active[i - 1].temperature = 522 (tz->trips.active[i - 2].temperature < 523 CELSIUS_TO_KELVIN(act) ? 524 tz->trips.active[i - 2].temperature : 525 CELSIUS_TO_KELVIN(act)); 526 break; 527 } else { 528 tz->trips.active[i].temperature = tmp; 529 tz->trips.active[i].flags.valid = 1; 530 } 531 } 532 533 name[2] = 'L'; 534 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) { 535 memset(&devices, 0, sizeof(struct acpi_handle_list)); 536 status = acpi_evaluate_reference(tz->device->handle, 537 name, NULL, &devices); 538 if (ACPI_FAILURE(status)) { 539 printk(KERN_WARNING PREFIX 540 "Invalid active%d threshold\n", i); 541 tz->trips.active[i].flags.valid = 0; 542 } 543 else 544 tz->trips.active[i].flags.valid = 1; 545 546 if (memcmp(&tz->trips.active[i].devices, &devices, 547 sizeof(struct acpi_handle_list))) { 548 memcpy(&tz->trips.active[i].devices, &devices, 549 sizeof(struct acpi_handle_list)); 550 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 551 } 552 } 553 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES)) 554 if (valid != tz->trips.active[i].flags.valid) 555 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state"); 556 557 if (!tz->trips.active[i].flags.valid) 558 break; 559 } 560 561 if (flag & ACPI_TRIPS_DEVICES) { 562 memset(&devices, 0, sizeof(struct acpi_handle_list)); 563 status = acpi_evaluate_reference(tz->device->handle, "_TZD", 564 NULL, &devices); 565 if (memcmp(&tz->devices, &devices, 566 sizeof(struct acpi_handle_list))) { 567 memcpy(&tz->devices, &devices, 568 sizeof(struct acpi_handle_list)); 569 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 570 } 571 } 572 573 return 0; 574 } 575 576 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) 577 { 578 return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT); 579 } 580 581 static void acpi_thermal_check(void *data) 582 { 583 struct acpi_thermal *tz = data; 584 585 thermal_zone_device_update(tz->thermal_zone); 586 } 587 588 /* sys I/F for generic thermal sysfs support */ 589 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100) 590 591 static int thermal_get_temp(struct thermal_zone_device *thermal, 592 unsigned long *temp) 593 { 594 struct acpi_thermal *tz = thermal->devdata; 595 int result; 596 597 if (!tz) 598 return -EINVAL; 599 600 result = acpi_thermal_get_temperature(tz); 601 if (result) 602 return result; 603 604 *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset); 605 return 0; 606 } 607 608 static const char enabled[] = "kernel"; 609 static const char disabled[] = "user"; 610 static int thermal_get_mode(struct thermal_zone_device *thermal, 611 enum thermal_device_mode *mode) 612 { 613 struct acpi_thermal *tz = thermal->devdata; 614 615 if (!tz) 616 return -EINVAL; 617 618 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED : 619 THERMAL_DEVICE_DISABLED; 620 621 return 0; 622 } 623 624 static int thermal_set_mode(struct thermal_zone_device *thermal, 625 enum thermal_device_mode mode) 626 { 627 struct acpi_thermal *tz = thermal->devdata; 628 int enable; 629 630 if (!tz) 631 return -EINVAL; 632 633 /* 634 * enable/disable thermal management from ACPI thermal driver 635 */ 636 if (mode == THERMAL_DEVICE_ENABLED) 637 enable = 1; 638 else if (mode == THERMAL_DEVICE_DISABLED) 639 enable = 0; 640 else 641 return -EINVAL; 642 643 if (enable != tz->tz_enabled) { 644 tz->tz_enabled = enable; 645 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 646 "%s ACPI thermal control\n", 647 tz->tz_enabled ? enabled : disabled)); 648 acpi_thermal_check(tz); 649 } 650 return 0; 651 } 652 653 static int thermal_get_trip_type(struct thermal_zone_device *thermal, 654 int trip, enum thermal_trip_type *type) 655 { 656 struct acpi_thermal *tz = thermal->devdata; 657 int i; 658 659 if (!tz || trip < 0) 660 return -EINVAL; 661 662 if (tz->trips.critical.flags.valid) { 663 if (!trip) { 664 *type = THERMAL_TRIP_CRITICAL; 665 return 0; 666 } 667 trip--; 668 } 669 670 if (tz->trips.hot.flags.valid) { 671 if (!trip) { 672 *type = THERMAL_TRIP_HOT; 673 return 0; 674 } 675 trip--; 676 } 677 678 if (tz->trips.passive.flags.valid) { 679 if (!trip) { 680 *type = THERMAL_TRIP_PASSIVE; 681 return 0; 682 } 683 trip--; 684 } 685 686 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 687 tz->trips.active[i].flags.valid; i++) { 688 if (!trip) { 689 *type = THERMAL_TRIP_ACTIVE; 690 return 0; 691 } 692 trip--; 693 } 694 695 return -EINVAL; 696 } 697 698 static int thermal_get_trip_temp(struct thermal_zone_device *thermal, 699 int trip, unsigned long *temp) 700 { 701 struct acpi_thermal *tz = thermal->devdata; 702 int i; 703 704 if (!tz || trip < 0) 705 return -EINVAL; 706 707 if (tz->trips.critical.flags.valid) { 708 if (!trip) { 709 *temp = KELVIN_TO_MILLICELSIUS( 710 tz->trips.critical.temperature, 711 tz->kelvin_offset); 712 return 0; 713 } 714 trip--; 715 } 716 717 if (tz->trips.hot.flags.valid) { 718 if (!trip) { 719 *temp = KELVIN_TO_MILLICELSIUS( 720 tz->trips.hot.temperature, 721 tz->kelvin_offset); 722 return 0; 723 } 724 trip--; 725 } 726 727 if (tz->trips.passive.flags.valid) { 728 if (!trip) { 729 *temp = KELVIN_TO_MILLICELSIUS( 730 tz->trips.passive.temperature, 731 tz->kelvin_offset); 732 return 0; 733 } 734 trip--; 735 } 736 737 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 738 tz->trips.active[i].flags.valid; i++) { 739 if (!trip) { 740 *temp = KELVIN_TO_MILLICELSIUS( 741 tz->trips.active[i].temperature, 742 tz->kelvin_offset); 743 return 0; 744 } 745 trip--; 746 } 747 748 return -EINVAL; 749 } 750 751 static int thermal_get_crit_temp(struct thermal_zone_device *thermal, 752 unsigned long *temperature) { 753 struct acpi_thermal *tz = thermal->devdata; 754 755 if (tz->trips.critical.flags.valid) { 756 *temperature = KELVIN_TO_MILLICELSIUS( 757 tz->trips.critical.temperature, 758 tz->kelvin_offset); 759 return 0; 760 } else 761 return -EINVAL; 762 } 763 764 static int thermal_notify(struct thermal_zone_device *thermal, int trip, 765 enum thermal_trip_type trip_type) 766 { 767 u8 type = 0; 768 struct acpi_thermal *tz = thermal->devdata; 769 770 if (trip_type == THERMAL_TRIP_CRITICAL) 771 type = ACPI_THERMAL_NOTIFY_CRITICAL; 772 else if (trip_type == THERMAL_TRIP_HOT) 773 type = ACPI_THERMAL_NOTIFY_HOT; 774 else 775 return 0; 776 777 acpi_bus_generate_proc_event(tz->device, type, 1); 778 acpi_bus_generate_netlink_event(tz->device->pnp.device_class, 779 dev_name(&tz->device->dev), type, 1); 780 781 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt) 782 return 1; 783 784 return 0; 785 } 786 787 typedef int (*cb)(struct thermal_zone_device *, int, 788 struct thermal_cooling_device *); 789 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal, 790 struct thermal_cooling_device *cdev, 791 cb action) 792 { 793 struct acpi_device *device = cdev->devdata; 794 struct acpi_thermal *tz = thermal->devdata; 795 struct acpi_device *dev; 796 acpi_status status; 797 acpi_handle handle; 798 int i; 799 int j; 800 int trip = -1; 801 int result = 0; 802 803 if (tz->trips.critical.flags.valid) 804 trip++; 805 806 if (tz->trips.hot.flags.valid) 807 trip++; 808 809 if (tz->trips.passive.flags.valid) { 810 trip++; 811 for (i = 0; i < tz->trips.passive.devices.count; 812 i++) { 813 handle = tz->trips.passive.devices.handles[i]; 814 status = acpi_bus_get_device(handle, &dev); 815 if (ACPI_SUCCESS(status) && (dev == device)) { 816 result = action(thermal, trip, cdev); 817 if (result) 818 goto failed; 819 } 820 } 821 } 822 823 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 824 if (!tz->trips.active[i].flags.valid) 825 break; 826 trip++; 827 for (j = 0; 828 j < tz->trips.active[i].devices.count; 829 j++) { 830 handle = tz->trips.active[i].devices.handles[j]; 831 status = acpi_bus_get_device(handle, &dev); 832 if (ACPI_SUCCESS(status) && (dev == device)) { 833 result = action(thermal, trip, cdev); 834 if (result) 835 goto failed; 836 } 837 } 838 } 839 840 for (i = 0; i < tz->devices.count; i++) { 841 handle = tz->devices.handles[i]; 842 status = acpi_bus_get_device(handle, &dev); 843 if (ACPI_SUCCESS(status) && (dev == device)) { 844 result = action(thermal, -1, cdev); 845 if (result) 846 goto failed; 847 } 848 } 849 850 failed: 851 return result; 852 } 853 854 static int 855 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal, 856 struct thermal_cooling_device *cdev) 857 { 858 return acpi_thermal_cooling_device_cb(thermal, cdev, 859 thermal_zone_bind_cooling_device); 860 } 861 862 static int 863 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal, 864 struct thermal_cooling_device *cdev) 865 { 866 return acpi_thermal_cooling_device_cb(thermal, cdev, 867 thermal_zone_unbind_cooling_device); 868 } 869 870 static struct thermal_zone_device_ops acpi_thermal_zone_ops = { 871 .bind = acpi_thermal_bind_cooling_device, 872 .unbind = acpi_thermal_unbind_cooling_device, 873 .get_temp = thermal_get_temp, 874 .get_mode = thermal_get_mode, 875 .set_mode = thermal_set_mode, 876 .get_trip_type = thermal_get_trip_type, 877 .get_trip_temp = thermal_get_trip_temp, 878 .get_crit_temp = thermal_get_crit_temp, 879 .notify = thermal_notify, 880 }; 881 882 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz) 883 { 884 int trips = 0; 885 int result; 886 acpi_status status; 887 int i; 888 889 if (tz->trips.critical.flags.valid) 890 trips++; 891 892 if (tz->trips.hot.flags.valid) 893 trips++; 894 895 if (tz->trips.passive.flags.valid) 896 trips++; 897 898 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 899 tz->trips.active[i].flags.valid; i++, trips++); 900 901 if (tz->trips.passive.flags.valid) 902 tz->thermal_zone = 903 thermal_zone_device_register("acpitz", trips, tz, 904 &acpi_thermal_zone_ops, 905 tz->trips.passive.tc1, 906 tz->trips.passive.tc2, 907 tz->trips.passive.tsp*100, 908 tz->polling_frequency*100); 909 else 910 tz->thermal_zone = 911 thermal_zone_device_register("acpitz", trips, tz, 912 &acpi_thermal_zone_ops, 913 0, 0, 0, 914 tz->polling_frequency*100); 915 if (IS_ERR(tz->thermal_zone)) 916 return -ENODEV; 917 918 result = sysfs_create_link(&tz->device->dev.kobj, 919 &tz->thermal_zone->device.kobj, "thermal_zone"); 920 if (result) 921 return result; 922 923 result = sysfs_create_link(&tz->thermal_zone->device.kobj, 924 &tz->device->dev.kobj, "device"); 925 if (result) 926 return result; 927 928 status = acpi_attach_data(tz->device->handle, 929 acpi_bus_private_data_handler, 930 tz->thermal_zone); 931 if (ACPI_FAILURE(status)) { 932 printk(KERN_ERR PREFIX 933 "Error attaching device data\n"); 934 return -ENODEV; 935 } 936 937 tz->tz_enabled = 1; 938 939 dev_info(&tz->device->dev, "registered as thermal_zone%d\n", 940 tz->thermal_zone->id); 941 return 0; 942 } 943 944 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz) 945 { 946 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); 947 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device"); 948 thermal_zone_device_unregister(tz->thermal_zone); 949 tz->thermal_zone = NULL; 950 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler); 951 } 952 953 954 /* -------------------------------------------------------------------------- 955 FS Interface (/proc) 956 -------------------------------------------------------------------------- */ 957 958 static struct proc_dir_entry *acpi_thermal_dir; 959 960 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset) 961 { 962 struct acpi_thermal *tz = seq->private; 963 964 965 if (!tz) 966 goto end; 967 968 seq_puts(seq, "state: "); 969 970 if (!tz->state.critical && !tz->state.hot && !tz->state.passive 971 && !tz->state.active) 972 seq_puts(seq, "ok\n"); 973 else { 974 if (tz->state.critical) 975 seq_puts(seq, "critical "); 976 if (tz->state.hot) 977 seq_puts(seq, "hot "); 978 if (tz->state.passive) 979 seq_puts(seq, "passive "); 980 if (tz->state.active) 981 seq_printf(seq, "active[%d]", tz->state.active_index); 982 seq_puts(seq, "\n"); 983 } 984 985 end: 986 return 0; 987 } 988 989 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file) 990 { 991 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data); 992 } 993 994 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset) 995 { 996 int result = 0; 997 struct acpi_thermal *tz = seq->private; 998 999 1000 if (!tz) 1001 goto end; 1002 1003 result = acpi_thermal_get_temperature(tz); 1004 if (result) 1005 goto end; 1006 1007 seq_printf(seq, "temperature: %ld C\n", 1008 KELVIN_TO_CELSIUS(tz->temperature)); 1009 1010 end: 1011 return 0; 1012 } 1013 1014 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file) 1015 { 1016 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data); 1017 } 1018 1019 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset) 1020 { 1021 struct acpi_thermal *tz = seq->private; 1022 struct acpi_device *device; 1023 acpi_status status; 1024 1025 int i = 0; 1026 int j = 0; 1027 1028 1029 if (!tz) 1030 goto end; 1031 1032 if (tz->trips.critical.flags.valid) 1033 seq_printf(seq, "critical (S5): %ld C%s", 1034 KELVIN_TO_CELSIUS(tz->trips.critical.temperature), 1035 nocrt ? " <disabled>\n" : "\n"); 1036 1037 if (tz->trips.hot.flags.valid) 1038 seq_printf(seq, "hot (S4): %ld C%s", 1039 KELVIN_TO_CELSIUS(tz->trips.hot.temperature), 1040 nocrt ? " <disabled>\n" : "\n"); 1041 1042 if (tz->trips.passive.flags.valid) { 1043 seq_printf(seq, 1044 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=", 1045 KELVIN_TO_CELSIUS(tz->trips.passive.temperature), 1046 tz->trips.passive.tc1, tz->trips.passive.tc2, 1047 tz->trips.passive.tsp); 1048 for (j = 0; j < tz->trips.passive.devices.count; j++) { 1049 status = acpi_bus_get_device(tz->trips.passive.devices. 1050 handles[j], &device); 1051 seq_printf(seq, "%4.4s ", status ? "" : 1052 acpi_device_bid(device)); 1053 } 1054 seq_puts(seq, "\n"); 1055 } else { 1056 seq_printf(seq, "passive (forced):"); 1057 if (tz->thermal_zone->forced_passive) 1058 seq_printf(seq, " %i C\n", 1059 tz->thermal_zone->forced_passive / 1000); 1060 else 1061 seq_printf(seq, "<not set>\n"); 1062 } 1063 1064 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1065 if (!(tz->trips.active[i].flags.valid)) 1066 break; 1067 seq_printf(seq, "active[%d]: %ld C: devices=", 1068 i, 1069 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature)); 1070 for (j = 0; j < tz->trips.active[i].devices.count; j++){ 1071 status = acpi_bus_get_device(tz->trips.active[i]. 1072 devices.handles[j], 1073 &device); 1074 seq_printf(seq, "%4.4s ", status ? "" : 1075 acpi_device_bid(device)); 1076 } 1077 seq_puts(seq, "\n"); 1078 } 1079 1080 end: 1081 return 0; 1082 } 1083 1084 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file) 1085 { 1086 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data); 1087 } 1088 1089 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset) 1090 { 1091 struct acpi_thermal *tz = seq->private; 1092 1093 1094 if (!tz) 1095 goto end; 1096 1097 if (!tz->flags.cooling_mode) 1098 seq_puts(seq, "<setting not supported>\n"); 1099 else 1100 seq_puts(seq, "0 - Active; 1 - Passive\n"); 1101 1102 end: 1103 return 0; 1104 } 1105 1106 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file) 1107 { 1108 return single_open(file, acpi_thermal_cooling_seq_show, 1109 PDE(inode)->data); 1110 } 1111 1112 static ssize_t 1113 acpi_thermal_write_cooling_mode(struct file *file, 1114 const char __user * buffer, 1115 size_t count, loff_t * ppos) 1116 { 1117 struct seq_file *m = file->private_data; 1118 struct acpi_thermal *tz = m->private; 1119 int result = 0; 1120 char mode_string[12] = { '\0' }; 1121 1122 1123 if (!tz || (count > sizeof(mode_string) - 1)) 1124 return -EINVAL; 1125 1126 if (!tz->flags.cooling_mode) 1127 return -ENODEV; 1128 1129 if (copy_from_user(mode_string, buffer, count)) 1130 return -EFAULT; 1131 1132 mode_string[count] = '\0'; 1133 1134 result = acpi_thermal_set_cooling_mode(tz, 1135 simple_strtoul(mode_string, NULL, 1136 0)); 1137 if (result) 1138 return result; 1139 1140 acpi_thermal_check(tz); 1141 1142 return count; 1143 } 1144 1145 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset) 1146 { 1147 struct acpi_thermal *tz = seq->private; 1148 1149 1150 if (!tz) 1151 goto end; 1152 1153 if (!tz->thermal_zone->polling_delay) { 1154 seq_puts(seq, "<polling disabled>\n"); 1155 goto end; 1156 } 1157 1158 seq_printf(seq, "polling frequency: %d seconds\n", 1159 (tz->thermal_zone->polling_delay / 1000)); 1160 1161 end: 1162 return 0; 1163 } 1164 1165 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file) 1166 { 1167 return single_open(file, acpi_thermal_polling_seq_show, 1168 PDE(inode)->data); 1169 } 1170 1171 static ssize_t 1172 acpi_thermal_write_polling(struct file *file, 1173 const char __user * buffer, 1174 size_t count, loff_t * ppos) 1175 { 1176 struct seq_file *m = file->private_data; 1177 struct acpi_thermal *tz = m->private; 1178 int result = 0; 1179 char polling_string[12] = { '\0' }; 1180 int seconds = 0; 1181 1182 1183 if (!tz || (count > sizeof(polling_string) - 1)) 1184 return -EINVAL; 1185 1186 if (copy_from_user(polling_string, buffer, count)) 1187 return -EFAULT; 1188 1189 polling_string[count] = '\0'; 1190 1191 seconds = simple_strtoul(polling_string, NULL, 0); 1192 1193 result = acpi_thermal_set_polling(tz, seconds); 1194 if (result) 1195 return result; 1196 1197 acpi_thermal_check(tz); 1198 1199 return count; 1200 } 1201 1202 static int acpi_thermal_add_fs(struct acpi_device *device) 1203 { 1204 struct proc_dir_entry *entry = NULL; 1205 1206 1207 if (!acpi_device_dir(device)) { 1208 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 1209 acpi_thermal_dir); 1210 if (!acpi_device_dir(device)) 1211 return -ENODEV; 1212 } 1213 1214 /* 'state' [R] */ 1215 entry = proc_create_data(ACPI_THERMAL_FILE_STATE, 1216 S_IRUGO, acpi_device_dir(device), 1217 &acpi_thermal_state_fops, 1218 acpi_driver_data(device)); 1219 if (!entry) 1220 return -ENODEV; 1221 1222 /* 'temperature' [R] */ 1223 entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE, 1224 S_IRUGO, acpi_device_dir(device), 1225 &acpi_thermal_temp_fops, 1226 acpi_driver_data(device)); 1227 if (!entry) 1228 return -ENODEV; 1229 1230 /* 'trip_points' [R] */ 1231 entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS, 1232 S_IRUGO, 1233 acpi_device_dir(device), 1234 &acpi_thermal_trip_fops, 1235 acpi_driver_data(device)); 1236 if (!entry) 1237 return -ENODEV; 1238 1239 /* 'cooling_mode' [R/W] */ 1240 entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE, 1241 S_IFREG | S_IRUGO | S_IWUSR, 1242 acpi_device_dir(device), 1243 &acpi_thermal_cooling_fops, 1244 acpi_driver_data(device)); 1245 if (!entry) 1246 return -ENODEV; 1247 1248 /* 'polling_frequency' [R/W] */ 1249 entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ, 1250 S_IFREG | S_IRUGO | S_IWUSR, 1251 acpi_device_dir(device), 1252 &acpi_thermal_polling_fops, 1253 acpi_driver_data(device)); 1254 if (!entry) 1255 return -ENODEV; 1256 return 0; 1257 } 1258 1259 static int acpi_thermal_remove_fs(struct acpi_device *device) 1260 { 1261 1262 if (acpi_device_dir(device)) { 1263 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ, 1264 acpi_device_dir(device)); 1265 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE, 1266 acpi_device_dir(device)); 1267 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS, 1268 acpi_device_dir(device)); 1269 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE, 1270 acpi_device_dir(device)); 1271 remove_proc_entry(ACPI_THERMAL_FILE_STATE, 1272 acpi_device_dir(device)); 1273 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir); 1274 acpi_device_dir(device) = NULL; 1275 } 1276 1277 return 0; 1278 } 1279 1280 /* -------------------------------------------------------------------------- 1281 Driver Interface 1282 -------------------------------------------------------------------------- */ 1283 1284 static void acpi_thermal_notify(struct acpi_device *device, u32 event) 1285 { 1286 struct acpi_thermal *tz = acpi_driver_data(device); 1287 1288 1289 if (!tz) 1290 return; 1291 1292 switch (event) { 1293 case ACPI_THERMAL_NOTIFY_TEMPERATURE: 1294 acpi_thermal_check(tz); 1295 break; 1296 case ACPI_THERMAL_NOTIFY_THRESHOLDS: 1297 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS); 1298 acpi_thermal_check(tz); 1299 acpi_bus_generate_proc_event(device, event, 0); 1300 acpi_bus_generate_netlink_event(device->pnp.device_class, 1301 dev_name(&device->dev), event, 0); 1302 break; 1303 case ACPI_THERMAL_NOTIFY_DEVICES: 1304 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES); 1305 acpi_thermal_check(tz); 1306 acpi_bus_generate_proc_event(device, event, 0); 1307 acpi_bus_generate_netlink_event(device->pnp.device_class, 1308 dev_name(&device->dev), event, 0); 1309 break; 1310 default: 1311 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1312 "Unsupported event [0x%x]\n", event)); 1313 break; 1314 } 1315 } 1316 1317 static int acpi_thermal_get_info(struct acpi_thermal *tz) 1318 { 1319 int result = 0; 1320 1321 1322 if (!tz) 1323 return -EINVAL; 1324 1325 /* Get temperature [_TMP] (required) */ 1326 result = acpi_thermal_get_temperature(tz); 1327 if (result) 1328 return result; 1329 1330 /* Get trip points [_CRT, _PSV, etc.] (required) */ 1331 result = acpi_thermal_get_trip_points(tz); 1332 if (result) 1333 return result; 1334 1335 /* Set the cooling mode [_SCP] to active cooling (default) */ 1336 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE); 1337 if (!result) 1338 tz->flags.cooling_mode = 1; 1339 1340 /* Get default polling frequency [_TZP] (optional) */ 1341 if (tzp) 1342 tz->polling_frequency = tzp; 1343 else 1344 acpi_thermal_get_polling_frequency(tz); 1345 1346 return 0; 1347 } 1348 1349 /* 1350 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI 1351 * handles temperature values with a single decimal place. As a consequence, 1352 * some implementations use an offset of 273.1 and others use an offset of 1353 * 273.2. Try to find out which one is being used, to present the most 1354 * accurate and visually appealing number. 1355 * 1356 * The heuristic below should work for all ACPI thermal zones which have a 1357 * critical trip point with a value being a multiple of 0.5 degree Celsius. 1358 */ 1359 static void acpi_thermal_guess_offset(struct acpi_thermal *tz) 1360 { 1361 if (tz->trips.critical.flags.valid && 1362 (tz->trips.critical.temperature % 5) == 1) 1363 tz->kelvin_offset = 2731; 1364 else 1365 tz->kelvin_offset = 2732; 1366 } 1367 1368 static int acpi_thermal_add(struct acpi_device *device) 1369 { 1370 int result = 0; 1371 struct acpi_thermal *tz = NULL; 1372 1373 1374 if (!device) 1375 return -EINVAL; 1376 1377 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL); 1378 if (!tz) 1379 return -ENOMEM; 1380 1381 tz->device = device; 1382 strcpy(tz->name, device->pnp.bus_id); 1383 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME); 1384 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS); 1385 device->driver_data = tz; 1386 mutex_init(&tz->lock); 1387 1388 1389 result = acpi_thermal_get_info(tz); 1390 if (result) 1391 goto free_memory; 1392 1393 acpi_thermal_guess_offset(tz); 1394 1395 result = acpi_thermal_register_thermal_zone(tz); 1396 if (result) 1397 goto free_memory; 1398 1399 result = acpi_thermal_add_fs(device); 1400 if (result) 1401 goto unregister_thermal_zone; 1402 1403 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n", 1404 acpi_device_name(device), acpi_device_bid(device), 1405 KELVIN_TO_CELSIUS(tz->temperature)); 1406 goto end; 1407 1408 unregister_thermal_zone: 1409 thermal_zone_device_unregister(tz->thermal_zone); 1410 free_memory: 1411 kfree(tz); 1412 end: 1413 return result; 1414 } 1415 1416 static int acpi_thermal_remove(struct acpi_device *device, int type) 1417 { 1418 struct acpi_thermal *tz = NULL; 1419 1420 if (!device || !acpi_driver_data(device)) 1421 return -EINVAL; 1422 1423 tz = acpi_driver_data(device); 1424 1425 acpi_thermal_remove_fs(device); 1426 acpi_thermal_unregister_thermal_zone(tz); 1427 mutex_destroy(&tz->lock); 1428 kfree(tz); 1429 return 0; 1430 } 1431 1432 static int acpi_thermal_resume(struct acpi_device *device) 1433 { 1434 struct acpi_thermal *tz = NULL; 1435 int i, j, power_state, result; 1436 1437 1438 if (!device || !acpi_driver_data(device)) 1439 return -EINVAL; 1440 1441 tz = acpi_driver_data(device); 1442 1443 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1444 if (!(&tz->trips.active[i])) 1445 break; 1446 if (!tz->trips.active[i].flags.valid) 1447 break; 1448 tz->trips.active[i].flags.enabled = 1; 1449 for (j = 0; j < tz->trips.active[i].devices.count; j++) { 1450 result = acpi_bus_get_power(tz->trips.active[i].devices. 1451 handles[j], &power_state); 1452 if (result || (power_state != ACPI_STATE_D0)) { 1453 tz->trips.active[i].flags.enabled = 0; 1454 break; 1455 } 1456 } 1457 tz->state.active |= tz->trips.active[i].flags.enabled; 1458 } 1459 1460 acpi_thermal_check(tz); 1461 1462 return AE_OK; 1463 } 1464 1465 static int thermal_act(const struct dmi_system_id *d) { 1466 1467 if (act == 0) { 1468 printk(KERN_NOTICE "ACPI: %s detected: " 1469 "disabling all active thermal trip points\n", d->ident); 1470 act = -1; 1471 } 1472 return 0; 1473 } 1474 static int thermal_nocrt(const struct dmi_system_id *d) { 1475 1476 printk(KERN_NOTICE "ACPI: %s detected: " 1477 "disabling all critical thermal trip point actions.\n", d->ident); 1478 nocrt = 1; 1479 return 0; 1480 } 1481 static int thermal_tzp(const struct dmi_system_id *d) { 1482 1483 if (tzp == 0) { 1484 printk(KERN_NOTICE "ACPI: %s detected: " 1485 "enabling thermal zone polling\n", d->ident); 1486 tzp = 300; /* 300 dS = 30 Seconds */ 1487 } 1488 return 0; 1489 } 1490 static int thermal_psv(const struct dmi_system_id *d) { 1491 1492 if (psv == 0) { 1493 printk(KERN_NOTICE "ACPI: %s detected: " 1494 "disabling all passive thermal trip points\n", d->ident); 1495 psv = -1; 1496 } 1497 return 0; 1498 } 1499 1500 static struct dmi_system_id thermal_dmi_table[] __initdata = { 1501 /* 1502 * Award BIOS on this AOpen makes thermal control almost worthless. 1503 * http://bugzilla.kernel.org/show_bug.cgi?id=8842 1504 */ 1505 { 1506 .callback = thermal_act, 1507 .ident = "AOpen i915GMm-HFS", 1508 .matches = { 1509 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1510 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1511 }, 1512 }, 1513 { 1514 .callback = thermal_psv, 1515 .ident = "AOpen i915GMm-HFS", 1516 .matches = { 1517 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1518 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1519 }, 1520 }, 1521 { 1522 .callback = thermal_tzp, 1523 .ident = "AOpen i915GMm-HFS", 1524 .matches = { 1525 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1526 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1527 }, 1528 }, 1529 { 1530 .callback = thermal_nocrt, 1531 .ident = "Gigabyte GA-7ZX", 1532 .matches = { 1533 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."), 1534 DMI_MATCH(DMI_BOARD_NAME, "7ZX"), 1535 }, 1536 }, 1537 {} 1538 }; 1539 1540 static int __init acpi_thermal_init(void) 1541 { 1542 int result = 0; 1543 1544 dmi_check_system(thermal_dmi_table); 1545 1546 if (off) { 1547 printk(KERN_NOTICE "ACPI: thermal control disabled\n"); 1548 return -ENODEV; 1549 } 1550 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir); 1551 if (!acpi_thermal_dir) 1552 return -ENODEV; 1553 1554 result = acpi_bus_register_driver(&acpi_thermal_driver); 1555 if (result < 0) { 1556 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir); 1557 return -ENODEV; 1558 } 1559 1560 return 0; 1561 } 1562 1563 static void __exit acpi_thermal_exit(void) 1564 { 1565 1566 acpi_bus_unregister_driver(&acpi_thermal_driver); 1567 1568 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir); 1569 1570 return; 1571 } 1572 1573 module_init(acpi_thermal_init); 1574 module_exit(acpi_thermal_exit); 1575