Loading...
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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20 *
21 * This driver fully implements the ACPI thermal policy as described in the
22 * ACPI 2.0 Specification.
23 *
24 * TBD: 1. Implement passive cooling hysteresis.
25 * 2. Enhance passive cooling (CPU) states/limit interface to support
26 * concepts of 'multiple limiters', upper/lower limits, etc.
27 *
28 */
29
30#include <linux/kernel.h>
31#include <linux/module.h>
32#include <linux/dmi.h>
33#include <linux/init.h>
34#include <linux/slab.h>
35#include <linux/types.h>
36#include <linux/jiffies.h>
37#include <linux/kmod.h>
38#include <linux/reboot.h>
39#include <linux/device.h>
40#include <linux/thermal.h>
41#include <linux/acpi.h>
42#include <linux/workqueue.h>
43#include <asm/uaccess.h>
44
45#define PREFIX "ACPI: "
46
47#define ACPI_THERMAL_CLASS "thermal_zone"
48#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
49#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
50#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
51#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
52#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
53#define ACPI_THERMAL_NOTIFY_HOT 0xF1
54#define ACPI_THERMAL_MODE_ACTIVE 0x00
55
56#define ACPI_THERMAL_MAX_ACTIVE 10
57#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
58
59#define _COMPONENT ACPI_THERMAL_COMPONENT
60ACPI_MODULE_NAME("thermal");
61
62MODULE_AUTHOR("Paul Diefenbaugh");
63MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
64MODULE_LICENSE("GPL");
65
66static int act;
67module_param(act, int, 0644);
68MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
69
70static int crt;
71module_param(crt, int, 0644);
72MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
73
74static int tzp;
75module_param(tzp, int, 0444);
76MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
77
78static int nocrt;
79module_param(nocrt, int, 0);
80MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
81
82static int off;
83module_param(off, int, 0);
84MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
85
86static int psv;
87module_param(psv, int, 0644);
88MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
89
90static struct workqueue_struct *acpi_thermal_pm_queue;
91
92static int acpi_thermal_add(struct acpi_device *device);
93static int acpi_thermal_remove(struct acpi_device *device);
94static void acpi_thermal_notify(struct acpi_device *device, u32 event);
95
96static const struct acpi_device_id thermal_device_ids[] = {
97 {ACPI_THERMAL_HID, 0},
98 {"", 0},
99};
100MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
101
102#ifdef CONFIG_PM_SLEEP
103static int acpi_thermal_suspend(struct device *dev);
104static int acpi_thermal_resume(struct device *dev);
105#else
106#define acpi_thermal_suspend NULL
107#define acpi_thermal_resume NULL
108#endif
109static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
110
111static struct acpi_driver acpi_thermal_driver = {
112 .name = "thermal",
113 .class = ACPI_THERMAL_CLASS,
114 .ids = thermal_device_ids,
115 .ops = {
116 .add = acpi_thermal_add,
117 .remove = acpi_thermal_remove,
118 .notify = acpi_thermal_notify,
119 },
120 .drv.pm = &acpi_thermal_pm,
121};
122
123struct acpi_thermal_state {
124 u8 critical:1;
125 u8 hot:1;
126 u8 passive:1;
127 u8 active:1;
128 u8 reserved:4;
129 int active_index;
130};
131
132struct acpi_thermal_state_flags {
133 u8 valid:1;
134 u8 enabled:1;
135 u8 reserved:6;
136};
137
138struct acpi_thermal_critical {
139 struct acpi_thermal_state_flags flags;
140 unsigned long temperature;
141};
142
143struct acpi_thermal_hot {
144 struct acpi_thermal_state_flags flags;
145 unsigned long temperature;
146};
147
148struct acpi_thermal_passive {
149 struct acpi_thermal_state_flags flags;
150 unsigned long temperature;
151 unsigned long tc1;
152 unsigned long tc2;
153 unsigned long tsp;
154 struct acpi_handle_list devices;
155};
156
157struct acpi_thermal_active {
158 struct acpi_thermal_state_flags flags;
159 unsigned long temperature;
160 struct acpi_handle_list devices;
161};
162
163struct acpi_thermal_trips {
164 struct acpi_thermal_critical critical;
165 struct acpi_thermal_hot hot;
166 struct acpi_thermal_passive passive;
167 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
168};
169
170struct acpi_thermal_flags {
171 u8 cooling_mode:1; /* _SCP */
172 u8 devices:1; /* _TZD */
173 u8 reserved:6;
174};
175
176struct acpi_thermal {
177 struct acpi_device * device;
178 acpi_bus_id name;
179 unsigned long temperature;
180 unsigned long last_temperature;
181 unsigned long polling_frequency;
182 volatile u8 zombie;
183 struct acpi_thermal_flags flags;
184 struct acpi_thermal_state state;
185 struct acpi_thermal_trips trips;
186 struct acpi_handle_list devices;
187 struct thermal_zone_device *thermal_zone;
188 int tz_enabled;
189 int kelvin_offset;
190 struct work_struct thermal_check_work;
191};
192
193/* --------------------------------------------------------------------------
194 Thermal Zone Management
195 -------------------------------------------------------------------------- */
196
197static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
198{
199 acpi_status status = AE_OK;
200 unsigned long long tmp;
201
202 if (!tz)
203 return -EINVAL;
204
205 tz->last_temperature = tz->temperature;
206
207 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
208 if (ACPI_FAILURE(status))
209 return -ENODEV;
210
211 tz->temperature = tmp;
212 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
213 tz->temperature));
214
215 return 0;
216}
217
218static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
219{
220 acpi_status status = AE_OK;
221 unsigned long long tmp;
222
223 if (!tz)
224 return -EINVAL;
225
226 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
227 if (ACPI_FAILURE(status))
228 return -ENODEV;
229
230 tz->polling_frequency = tmp;
231 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
232 tz->polling_frequency));
233
234 return 0;
235}
236
237static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
238{
239 if (!tz)
240 return -EINVAL;
241
242 if (!acpi_has_method(tz->device->handle, "_SCP")) {
243 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
244 return -ENODEV;
245 } else if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
246 "_SCP", mode))) {
247 return -ENODEV;
248 }
249
250 return 0;
251}
252
253#define ACPI_TRIPS_CRITICAL 0x01
254#define ACPI_TRIPS_HOT 0x02
255#define ACPI_TRIPS_PASSIVE 0x04
256#define ACPI_TRIPS_ACTIVE 0x08
257#define ACPI_TRIPS_DEVICES 0x10
258
259#define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
260#define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
261
262#define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
263 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
264 ACPI_TRIPS_DEVICES)
265
266/*
267 * This exception is thrown out in two cases:
268 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
269 * when re-evaluating the AML code.
270 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
271 * We need to re-bind the cooling devices of a thermal zone when this occurs.
272 */
273#define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
274do { \
275 if (flags != ACPI_TRIPS_INIT) \
276 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
277 "ACPI thermal trip point %s changed\n" \
278 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
279} while (0)
280
281static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
282{
283 acpi_status status = AE_OK;
284 unsigned long long tmp;
285 struct acpi_handle_list devices;
286 int valid = 0;
287 int i;
288
289 /* Critical Shutdown */
290 if (flag & ACPI_TRIPS_CRITICAL) {
291 status = acpi_evaluate_integer(tz->device->handle,
292 "_CRT", NULL, &tmp);
293 tz->trips.critical.temperature = tmp;
294 /*
295 * Treat freezing temperatures as invalid as well; some
296 * BIOSes return really low values and cause reboots at startup.
297 * Below zero (Celsius) values clearly aren't right for sure..
298 * ... so lets discard those as invalid.
299 */
300 if (ACPI_FAILURE(status)) {
301 tz->trips.critical.flags.valid = 0;
302 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
303 "No critical threshold\n"));
304 } else if (tmp <= 2732) {
305 pr_warn(FW_BUG "Invalid critical threshold (%llu)\n",
306 tmp);
307 tz->trips.critical.flags.valid = 0;
308 } else {
309 tz->trips.critical.flags.valid = 1;
310 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
311 "Found critical threshold [%lu]\n",
312 tz->trips.critical.temperature));
313 }
314 if (tz->trips.critical.flags.valid == 1) {
315 if (crt == -1) {
316 tz->trips.critical.flags.valid = 0;
317 } else if (crt > 0) {
318 unsigned long crt_k = CELSIUS_TO_DECI_KELVIN(crt);
319 /*
320 * Allow override critical threshold
321 */
322 if (crt_k > tz->trips.critical.temperature)
323 pr_warn(PREFIX "Critical threshold %d C\n",
324 crt);
325 tz->trips.critical.temperature = crt_k;
326 }
327 }
328 }
329
330 /* Critical Sleep (optional) */
331 if (flag & ACPI_TRIPS_HOT) {
332 status = acpi_evaluate_integer(tz->device->handle,
333 "_HOT", NULL, &tmp);
334 if (ACPI_FAILURE(status)) {
335 tz->trips.hot.flags.valid = 0;
336 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
337 "No hot threshold\n"));
338 } else {
339 tz->trips.hot.temperature = tmp;
340 tz->trips.hot.flags.valid = 1;
341 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
342 "Found hot threshold [%lu]\n",
343 tz->trips.hot.temperature));
344 }
345 }
346
347 /* Passive (optional) */
348 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
349 (flag == ACPI_TRIPS_INIT)) {
350 valid = tz->trips.passive.flags.valid;
351 if (psv == -1) {
352 status = AE_SUPPORT;
353 } else if (psv > 0) {
354 tmp = CELSIUS_TO_DECI_KELVIN(psv);
355 status = AE_OK;
356 } else {
357 status = acpi_evaluate_integer(tz->device->handle,
358 "_PSV", NULL, &tmp);
359 }
360
361 if (ACPI_FAILURE(status))
362 tz->trips.passive.flags.valid = 0;
363 else {
364 tz->trips.passive.temperature = tmp;
365 tz->trips.passive.flags.valid = 1;
366 if (flag == ACPI_TRIPS_INIT) {
367 status = acpi_evaluate_integer(
368 tz->device->handle, "_TC1",
369 NULL, &tmp);
370 if (ACPI_FAILURE(status))
371 tz->trips.passive.flags.valid = 0;
372 else
373 tz->trips.passive.tc1 = tmp;
374 status = acpi_evaluate_integer(
375 tz->device->handle, "_TC2",
376 NULL, &tmp);
377 if (ACPI_FAILURE(status))
378 tz->trips.passive.flags.valid = 0;
379 else
380 tz->trips.passive.tc2 = tmp;
381 status = acpi_evaluate_integer(
382 tz->device->handle, "_TSP",
383 NULL, &tmp);
384 if (ACPI_FAILURE(status))
385 tz->trips.passive.flags.valid = 0;
386 else
387 tz->trips.passive.tsp = tmp;
388 }
389 }
390 }
391 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
392 memset(&devices, 0, sizeof(struct acpi_handle_list));
393 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
394 NULL, &devices);
395 if (ACPI_FAILURE(status)) {
396 pr_warn(PREFIX "Invalid passive threshold\n");
397 tz->trips.passive.flags.valid = 0;
398 }
399 else
400 tz->trips.passive.flags.valid = 1;
401
402 if (memcmp(&tz->trips.passive.devices, &devices,
403 sizeof(struct acpi_handle_list))) {
404 memcpy(&tz->trips.passive.devices, &devices,
405 sizeof(struct acpi_handle_list));
406 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
407 }
408 }
409 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
410 if (valid != tz->trips.passive.flags.valid)
411 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
412 }
413
414 /* Active (optional) */
415 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
416 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
417 valid = tz->trips.active[i].flags.valid;
418
419 if (act == -1)
420 break; /* disable all active trip points */
421
422 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
423 tz->trips.active[i].flags.valid)) {
424 status = acpi_evaluate_integer(tz->device->handle,
425 name, NULL, &tmp);
426 if (ACPI_FAILURE(status)) {
427 tz->trips.active[i].flags.valid = 0;
428 if (i == 0)
429 break;
430 if (act <= 0)
431 break;
432 if (i == 1)
433 tz->trips.active[0].temperature =
434 CELSIUS_TO_DECI_KELVIN(act);
435 else
436 /*
437 * Don't allow override higher than
438 * the next higher trip point
439 */
440 tz->trips.active[i - 1].temperature =
441 (tz->trips.active[i - 2].temperature <
442 CELSIUS_TO_DECI_KELVIN(act) ?
443 tz->trips.active[i - 2].temperature :
444 CELSIUS_TO_DECI_KELVIN(act));
445 break;
446 } else {
447 tz->trips.active[i].temperature = tmp;
448 tz->trips.active[i].flags.valid = 1;
449 }
450 }
451
452 name[2] = 'L';
453 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
454 memset(&devices, 0, sizeof(struct acpi_handle_list));
455 status = acpi_evaluate_reference(tz->device->handle,
456 name, NULL, &devices);
457 if (ACPI_FAILURE(status)) {
458 pr_warn(PREFIX "Invalid active%d threshold\n",
459 i);
460 tz->trips.active[i].flags.valid = 0;
461 }
462 else
463 tz->trips.active[i].flags.valid = 1;
464
465 if (memcmp(&tz->trips.active[i].devices, &devices,
466 sizeof(struct acpi_handle_list))) {
467 memcpy(&tz->trips.active[i].devices, &devices,
468 sizeof(struct acpi_handle_list));
469 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
470 }
471 }
472 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
473 if (valid != tz->trips.active[i].flags.valid)
474 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
475
476 if (!tz->trips.active[i].flags.valid)
477 break;
478 }
479
480 if ((flag & ACPI_TRIPS_DEVICES)
481 && acpi_has_method(tz->device->handle, "_TZD")) {
482 memset(&devices, 0, sizeof(devices));
483 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
484 NULL, &devices);
485 if (ACPI_SUCCESS(status)
486 && memcmp(&tz->devices, &devices, sizeof(devices))) {
487 tz->devices = devices;
488 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
489 }
490 }
491
492 return 0;
493}
494
495static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
496{
497 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
498
499 if (ret)
500 return ret;
501
502 valid = tz->trips.critical.flags.valid |
503 tz->trips.hot.flags.valid |
504 tz->trips.passive.flags.valid;
505
506 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
507 valid |= tz->trips.active[i].flags.valid;
508
509 if (!valid) {
510 pr_warn(FW_BUG "No valid trip found\n");
511 return -ENODEV;
512 }
513 return 0;
514}
515
516static void acpi_thermal_check(void *data)
517{
518 struct acpi_thermal *tz = data;
519
520 if (!tz->tz_enabled)
521 return;
522
523 thermal_zone_device_update(tz->thermal_zone);
524}
525
526/* sys I/F for generic thermal sysfs support */
527
528static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
529{
530 struct acpi_thermal *tz = thermal->devdata;
531 int result;
532
533 if (!tz)
534 return -EINVAL;
535
536 result = acpi_thermal_get_temperature(tz);
537 if (result)
538 return result;
539
540 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(tz->temperature,
541 tz->kelvin_offset);
542 return 0;
543}
544
545static int thermal_get_mode(struct thermal_zone_device *thermal,
546 enum thermal_device_mode *mode)
547{
548 struct acpi_thermal *tz = thermal->devdata;
549
550 if (!tz)
551 return -EINVAL;
552
553 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
554 THERMAL_DEVICE_DISABLED;
555
556 return 0;
557}
558
559static int thermal_set_mode(struct thermal_zone_device *thermal,
560 enum thermal_device_mode mode)
561{
562 struct acpi_thermal *tz = thermal->devdata;
563 int enable;
564
565 if (!tz)
566 return -EINVAL;
567
568 /*
569 * enable/disable thermal management from ACPI thermal driver
570 */
571 if (mode == THERMAL_DEVICE_ENABLED)
572 enable = 1;
573 else if (mode == THERMAL_DEVICE_DISABLED) {
574 enable = 0;
575 pr_warn("thermal zone will be disabled\n");
576 } else
577 return -EINVAL;
578
579 if (enable != tz->tz_enabled) {
580 tz->tz_enabled = enable;
581 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
582 "%s kernel ACPI thermal control\n",
583 tz->tz_enabled ? "Enable" : "Disable"));
584 acpi_thermal_check(tz);
585 }
586 return 0;
587}
588
589static int thermal_get_trip_type(struct thermal_zone_device *thermal,
590 int trip, enum thermal_trip_type *type)
591{
592 struct acpi_thermal *tz = thermal->devdata;
593 int i;
594
595 if (!tz || trip < 0)
596 return -EINVAL;
597
598 if (tz->trips.critical.flags.valid) {
599 if (!trip) {
600 *type = THERMAL_TRIP_CRITICAL;
601 return 0;
602 }
603 trip--;
604 }
605
606 if (tz->trips.hot.flags.valid) {
607 if (!trip) {
608 *type = THERMAL_TRIP_HOT;
609 return 0;
610 }
611 trip--;
612 }
613
614 if (tz->trips.passive.flags.valid) {
615 if (!trip) {
616 *type = THERMAL_TRIP_PASSIVE;
617 return 0;
618 }
619 trip--;
620 }
621
622 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
623 tz->trips.active[i].flags.valid; i++) {
624 if (!trip) {
625 *type = THERMAL_TRIP_ACTIVE;
626 return 0;
627 }
628 trip--;
629 }
630
631 return -EINVAL;
632}
633
634static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
635 int trip, int *temp)
636{
637 struct acpi_thermal *tz = thermal->devdata;
638 int i;
639
640 if (!tz || trip < 0)
641 return -EINVAL;
642
643 if (tz->trips.critical.flags.valid) {
644 if (!trip) {
645 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
646 tz->trips.critical.temperature,
647 tz->kelvin_offset);
648 return 0;
649 }
650 trip--;
651 }
652
653 if (tz->trips.hot.flags.valid) {
654 if (!trip) {
655 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
656 tz->trips.hot.temperature,
657 tz->kelvin_offset);
658 return 0;
659 }
660 trip--;
661 }
662
663 if (tz->trips.passive.flags.valid) {
664 if (!trip) {
665 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
666 tz->trips.passive.temperature,
667 tz->kelvin_offset);
668 return 0;
669 }
670 trip--;
671 }
672
673 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
674 tz->trips.active[i].flags.valid; i++) {
675 if (!trip) {
676 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
677 tz->trips.active[i].temperature,
678 tz->kelvin_offset);
679 return 0;
680 }
681 trip--;
682 }
683
684 return -EINVAL;
685}
686
687static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
688 int *temperature)
689{
690 struct acpi_thermal *tz = thermal->devdata;
691
692 if (tz->trips.critical.flags.valid) {
693 *temperature = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
694 tz->trips.critical.temperature,
695 tz->kelvin_offset);
696 return 0;
697 } else
698 return -EINVAL;
699}
700
701static int thermal_get_trend(struct thermal_zone_device *thermal,
702 int trip, enum thermal_trend *trend)
703{
704 struct acpi_thermal *tz = thermal->devdata;
705 enum thermal_trip_type type;
706 int i;
707
708 if (thermal_get_trip_type(thermal, trip, &type))
709 return -EINVAL;
710
711 if (type == THERMAL_TRIP_ACTIVE) {
712 int trip_temp;
713 int temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
714 tz->temperature, tz->kelvin_offset);
715 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
716 return -EINVAL;
717
718 if (temp > trip_temp) {
719 *trend = THERMAL_TREND_RAISING;
720 return 0;
721 } else {
722 /* Fall back on default trend */
723 return -EINVAL;
724 }
725 }
726
727 /*
728 * tz->temperature has already been updated by generic thermal layer,
729 * before this callback being invoked
730 */
731 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
732 + (tz->trips.passive.tc2
733 * (tz->temperature - tz->trips.passive.temperature));
734
735 if (i > 0)
736 *trend = THERMAL_TREND_RAISING;
737 else if (i < 0)
738 *trend = THERMAL_TREND_DROPPING;
739 else
740 *trend = THERMAL_TREND_STABLE;
741 return 0;
742}
743
744
745static int thermal_notify(struct thermal_zone_device *thermal, int trip,
746 enum thermal_trip_type trip_type)
747{
748 u8 type = 0;
749 struct acpi_thermal *tz = thermal->devdata;
750
751 if (trip_type == THERMAL_TRIP_CRITICAL)
752 type = ACPI_THERMAL_NOTIFY_CRITICAL;
753 else if (trip_type == THERMAL_TRIP_HOT)
754 type = ACPI_THERMAL_NOTIFY_HOT;
755 else
756 return 0;
757
758 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
759 dev_name(&tz->device->dev), type, 1);
760
761 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
762 return 1;
763
764 return 0;
765}
766
767static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
768 struct thermal_cooling_device *cdev,
769 bool bind)
770{
771 struct acpi_device *device = cdev->devdata;
772 struct acpi_thermal *tz = thermal->devdata;
773 struct acpi_device *dev;
774 acpi_status status;
775 acpi_handle handle;
776 int i;
777 int j;
778 int trip = -1;
779 int result = 0;
780
781 if (tz->trips.critical.flags.valid)
782 trip++;
783
784 if (tz->trips.hot.flags.valid)
785 trip++;
786
787 if (tz->trips.passive.flags.valid) {
788 trip++;
789 for (i = 0; i < tz->trips.passive.devices.count;
790 i++) {
791 handle = tz->trips.passive.devices.handles[i];
792 status = acpi_bus_get_device(handle, &dev);
793 if (ACPI_FAILURE(status) || dev != device)
794 continue;
795 if (bind)
796 result =
797 thermal_zone_bind_cooling_device
798 (thermal, trip, cdev,
799 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
800 THERMAL_WEIGHT_DEFAULT);
801 else
802 result =
803 thermal_zone_unbind_cooling_device
804 (thermal, trip, cdev);
805 if (result)
806 goto failed;
807 }
808 }
809
810 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
811 if (!tz->trips.active[i].flags.valid)
812 break;
813 trip++;
814 for (j = 0;
815 j < tz->trips.active[i].devices.count;
816 j++) {
817 handle = tz->trips.active[i].devices.handles[j];
818 status = acpi_bus_get_device(handle, &dev);
819 if (ACPI_FAILURE(status) || dev != device)
820 continue;
821 if (bind)
822 result = thermal_zone_bind_cooling_device
823 (thermal, trip, cdev,
824 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
825 THERMAL_WEIGHT_DEFAULT);
826 else
827 result = thermal_zone_unbind_cooling_device
828 (thermal, trip, cdev);
829 if (result)
830 goto failed;
831 }
832 }
833
834 for (i = 0; i < tz->devices.count; i++) {
835 handle = tz->devices.handles[i];
836 status = acpi_bus_get_device(handle, &dev);
837 if (ACPI_SUCCESS(status) && (dev == device)) {
838 if (bind)
839 result = thermal_zone_bind_cooling_device
840 (thermal, THERMAL_TRIPS_NONE,
841 cdev, THERMAL_NO_LIMIT,
842 THERMAL_NO_LIMIT,
843 THERMAL_WEIGHT_DEFAULT);
844 else
845 result = thermal_zone_unbind_cooling_device
846 (thermal, THERMAL_TRIPS_NONE,
847 cdev);
848 if (result)
849 goto failed;
850 }
851 }
852
853failed:
854 return result;
855}
856
857static int
858acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
859 struct thermal_cooling_device *cdev)
860{
861 return acpi_thermal_cooling_device_cb(thermal, cdev, true);
862}
863
864static int
865acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
866 struct thermal_cooling_device *cdev)
867{
868 return acpi_thermal_cooling_device_cb(thermal, cdev, false);
869}
870
871static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
872 .bind = acpi_thermal_bind_cooling_device,
873 .unbind = acpi_thermal_unbind_cooling_device,
874 .get_temp = thermal_get_temp,
875 .get_mode = thermal_get_mode,
876 .set_mode = thermal_set_mode,
877 .get_trip_type = thermal_get_trip_type,
878 .get_trip_temp = thermal_get_trip_temp,
879 .get_crit_temp = thermal_get_crit_temp,
880 .get_trend = thermal_get_trend,
881 .notify = thermal_notify,
882};
883
884static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
885{
886 int trips = 0;
887 int result;
888 acpi_status status;
889 int i;
890
891 if (tz->trips.critical.flags.valid)
892 trips++;
893
894 if (tz->trips.hot.flags.valid)
895 trips++;
896
897 if (tz->trips.passive.flags.valid)
898 trips++;
899
900 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
901 tz->trips.active[i].flags.valid; i++, trips++);
902
903 if (tz->trips.passive.flags.valid)
904 tz->thermal_zone =
905 thermal_zone_device_register("acpitz", trips, 0, tz,
906 &acpi_thermal_zone_ops, NULL,
907 tz->trips.passive.tsp*100,
908 tz->polling_frequency*100);
909 else
910 tz->thermal_zone =
911 thermal_zone_device_register("acpitz", trips, 0, tz,
912 &acpi_thermal_zone_ops, NULL,
913 0, tz->polling_frequency*100);
914 if (IS_ERR(tz->thermal_zone))
915 return -ENODEV;
916
917 result = sysfs_create_link(&tz->device->dev.kobj,
918 &tz->thermal_zone->device.kobj, "thermal_zone");
919 if (result)
920 return result;
921
922 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
923 &tz->device->dev.kobj, "device");
924 if (result)
925 return result;
926
927 status = acpi_bus_attach_private_data(tz->device->handle,
928 tz->thermal_zone);
929 if (ACPI_FAILURE(status))
930 return -ENODEV;
931
932 tz->tz_enabled = 1;
933
934 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
935 tz->thermal_zone->id);
936 return 0;
937}
938
939static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
940{
941 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
942 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
943 thermal_zone_device_unregister(tz->thermal_zone);
944 tz->thermal_zone = NULL;
945 acpi_bus_detach_private_data(tz->device->handle);
946}
947
948
949/* --------------------------------------------------------------------------
950 Driver Interface
951 -------------------------------------------------------------------------- */
952
953static void acpi_thermal_notify(struct acpi_device *device, u32 event)
954{
955 struct acpi_thermal *tz = acpi_driver_data(device);
956
957
958 if (!tz)
959 return;
960
961 switch (event) {
962 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
963 acpi_thermal_check(tz);
964 break;
965 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
966 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
967 acpi_thermal_check(tz);
968 acpi_bus_generate_netlink_event(device->pnp.device_class,
969 dev_name(&device->dev), event, 0);
970 break;
971 case ACPI_THERMAL_NOTIFY_DEVICES:
972 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
973 acpi_thermal_check(tz);
974 acpi_bus_generate_netlink_event(device->pnp.device_class,
975 dev_name(&device->dev), event, 0);
976 break;
977 default:
978 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
979 "Unsupported event [0x%x]\n", event));
980 break;
981 }
982}
983
984/*
985 * On some platforms, the AML code has dependency about
986 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
987 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
988 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
989 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
990 * if _TMP has never been evaluated.
991 *
992 * As this dependency is totally transparent to OS, evaluate
993 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
994 * _TMP, before they are actually used.
995 */
996static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
997{
998 acpi_handle handle = tz->device->handle;
999 unsigned long long value;
1000 int i;
1001
1002 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
1003 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
1004 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
1005 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1006 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
1007 acpi_status status;
1008
1009 status = acpi_evaluate_integer(handle, name, NULL, &value);
1010 if (status == AE_NOT_FOUND)
1011 break;
1012 }
1013 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
1014}
1015
1016static int acpi_thermal_get_info(struct acpi_thermal *tz)
1017{
1018 int result = 0;
1019
1020
1021 if (!tz)
1022 return -EINVAL;
1023
1024 acpi_thermal_aml_dependency_fix(tz);
1025
1026 /* Get trip points [_CRT, _PSV, etc.] (required) */
1027 result = acpi_thermal_get_trip_points(tz);
1028 if (result)
1029 return result;
1030
1031 /* Get temperature [_TMP] (required) */
1032 result = acpi_thermal_get_temperature(tz);
1033 if (result)
1034 return result;
1035
1036 /* Set the cooling mode [_SCP] to active cooling (default) */
1037 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1038 if (!result)
1039 tz->flags.cooling_mode = 1;
1040
1041 /* Get default polling frequency [_TZP] (optional) */
1042 if (tzp)
1043 tz->polling_frequency = tzp;
1044 else
1045 acpi_thermal_get_polling_frequency(tz);
1046
1047 return 0;
1048}
1049
1050/*
1051 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1052 * handles temperature values with a single decimal place. As a consequence,
1053 * some implementations use an offset of 273.1 and others use an offset of
1054 * 273.2. Try to find out which one is being used, to present the most
1055 * accurate and visually appealing number.
1056 *
1057 * The heuristic below should work for all ACPI thermal zones which have a
1058 * critical trip point with a value being a multiple of 0.5 degree Celsius.
1059 */
1060static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1061{
1062 if (tz->trips.critical.flags.valid &&
1063 (tz->trips.critical.temperature % 5) == 1)
1064 tz->kelvin_offset = 2731;
1065 else
1066 tz->kelvin_offset = 2732;
1067}
1068
1069static void acpi_thermal_check_fn(struct work_struct *work)
1070{
1071 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1072 thermal_check_work);
1073 acpi_thermal_check(tz);
1074}
1075
1076static int acpi_thermal_add(struct acpi_device *device)
1077{
1078 int result = 0;
1079 struct acpi_thermal *tz = NULL;
1080
1081
1082 if (!device)
1083 return -EINVAL;
1084
1085 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1086 if (!tz)
1087 return -ENOMEM;
1088
1089 tz->device = device;
1090 strcpy(tz->name, device->pnp.bus_id);
1091 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1092 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1093 device->driver_data = tz;
1094
1095 result = acpi_thermal_get_info(tz);
1096 if (result)
1097 goto free_memory;
1098
1099 acpi_thermal_guess_offset(tz);
1100
1101 result = acpi_thermal_register_thermal_zone(tz);
1102 if (result)
1103 goto free_memory;
1104
1105 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1106
1107 pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
1108 acpi_device_bid(device), DECI_KELVIN_TO_CELSIUS(tz->temperature));
1109 goto end;
1110
1111free_memory:
1112 kfree(tz);
1113end:
1114 return result;
1115}
1116
1117static int acpi_thermal_remove(struct acpi_device *device)
1118{
1119 struct acpi_thermal *tz = NULL;
1120
1121 if (!device || !acpi_driver_data(device))
1122 return -EINVAL;
1123
1124 flush_workqueue(acpi_thermal_pm_queue);
1125 tz = acpi_driver_data(device);
1126
1127 acpi_thermal_unregister_thermal_zone(tz);
1128 kfree(tz);
1129 return 0;
1130}
1131
1132#ifdef CONFIG_PM_SLEEP
1133static int acpi_thermal_suspend(struct device *dev)
1134{
1135 /* Make sure the previously queued thermal check work has been done */
1136 flush_workqueue(acpi_thermal_pm_queue);
1137 return 0;
1138}
1139
1140static int acpi_thermal_resume(struct device *dev)
1141{
1142 struct acpi_thermal *tz;
1143 int i, j, power_state, result;
1144
1145 if (!dev)
1146 return -EINVAL;
1147
1148 tz = acpi_driver_data(to_acpi_device(dev));
1149 if (!tz)
1150 return -EINVAL;
1151
1152 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1153 if (!(&tz->trips.active[i]))
1154 break;
1155 if (!tz->trips.active[i].flags.valid)
1156 break;
1157 tz->trips.active[i].flags.enabled = 1;
1158 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1159 result = acpi_bus_update_power(
1160 tz->trips.active[i].devices.handles[j],
1161 &power_state);
1162 if (result || (power_state != ACPI_STATE_D0)) {
1163 tz->trips.active[i].flags.enabled = 0;
1164 break;
1165 }
1166 }
1167 tz->state.active |= tz->trips.active[i].flags.enabled;
1168 }
1169
1170 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
1171
1172 return AE_OK;
1173}
1174#endif
1175
1176static int thermal_act(const struct dmi_system_id *d) {
1177
1178 if (act == 0) {
1179 pr_notice(PREFIX "%s detected: "
1180 "disabling all active thermal trip points\n", d->ident);
1181 act = -1;
1182 }
1183 return 0;
1184}
1185static int thermal_nocrt(const struct dmi_system_id *d) {
1186
1187 pr_notice(PREFIX "%s detected: "
1188 "disabling all critical thermal trip point actions.\n", d->ident);
1189 nocrt = 1;
1190 return 0;
1191}
1192static int thermal_tzp(const struct dmi_system_id *d) {
1193
1194 if (tzp == 0) {
1195 pr_notice(PREFIX "%s detected: "
1196 "enabling thermal zone polling\n", d->ident);
1197 tzp = 300; /* 300 dS = 30 Seconds */
1198 }
1199 return 0;
1200}
1201static int thermal_psv(const struct dmi_system_id *d) {
1202
1203 if (psv == 0) {
1204 pr_notice(PREFIX "%s detected: "
1205 "disabling all passive thermal trip points\n", d->ident);
1206 psv = -1;
1207 }
1208 return 0;
1209}
1210
1211static struct dmi_system_id thermal_dmi_table[] __initdata = {
1212 /*
1213 * Award BIOS on this AOpen makes thermal control almost worthless.
1214 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1215 */
1216 {
1217 .callback = thermal_act,
1218 .ident = "AOpen i915GMm-HFS",
1219 .matches = {
1220 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1221 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1222 },
1223 },
1224 {
1225 .callback = thermal_psv,
1226 .ident = "AOpen i915GMm-HFS",
1227 .matches = {
1228 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1229 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1230 },
1231 },
1232 {
1233 .callback = thermal_tzp,
1234 .ident = "AOpen i915GMm-HFS",
1235 .matches = {
1236 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1237 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1238 },
1239 },
1240 {
1241 .callback = thermal_nocrt,
1242 .ident = "Gigabyte GA-7ZX",
1243 .matches = {
1244 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1245 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1246 },
1247 },
1248 {}
1249};
1250
1251static int __init acpi_thermal_init(void)
1252{
1253 int result = 0;
1254
1255 dmi_check_system(thermal_dmi_table);
1256
1257 if (off) {
1258 pr_notice(PREFIX "thermal control disabled\n");
1259 return -ENODEV;
1260 }
1261
1262 acpi_thermal_pm_queue = create_workqueue("acpi_thermal_pm");
1263 if (!acpi_thermal_pm_queue)
1264 return -ENODEV;
1265
1266 result = acpi_bus_register_driver(&acpi_thermal_driver);
1267 if (result < 0) {
1268 destroy_workqueue(acpi_thermal_pm_queue);
1269 return -ENODEV;
1270 }
1271
1272 return 0;
1273}
1274
1275static void __exit acpi_thermal_exit(void)
1276{
1277 acpi_bus_unregister_driver(&acpi_thermal_driver);
1278 destroy_workqueue(acpi_thermal_pm_queue);
1279
1280 return;
1281}
1282
1283module_init(acpi_thermal_init);
1284module_exit(acpi_thermal_exit);
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/slab.h>
39#include <linux/types.h>
40#include <linux/jiffies.h>
41#include <linux/kmod.h>
42#include <linux/reboot.h>
43#include <linux/device.h>
44#include <linux/thermal.h>
45#include <linux/acpi.h>
46#include <linux/workqueue.h>
47#include <asm/uaccess.h>
48
49#define PREFIX "ACPI: "
50
51#define ACPI_THERMAL_CLASS "thermal_zone"
52#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
53#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
54#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
55#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
56#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
57#define ACPI_THERMAL_NOTIFY_HOT 0xF1
58#define ACPI_THERMAL_MODE_ACTIVE 0x00
59
60#define ACPI_THERMAL_MAX_ACTIVE 10
61#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
62
63#define _COMPONENT ACPI_THERMAL_COMPONENT
64ACPI_MODULE_NAME("thermal");
65
66MODULE_AUTHOR("Paul Diefenbaugh");
67MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
68MODULE_LICENSE("GPL");
69
70static int act;
71module_param(act, int, 0644);
72MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
73
74static int crt;
75module_param(crt, int, 0644);
76MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
77
78static int tzp;
79module_param(tzp, int, 0444);
80MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
81
82static int nocrt;
83module_param(nocrt, int, 0);
84MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
85
86static int off;
87module_param(off, int, 0);
88MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
89
90static int psv;
91module_param(psv, int, 0644);
92MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
93
94static struct workqueue_struct *acpi_thermal_pm_queue;
95
96static int acpi_thermal_add(struct acpi_device *device);
97static int acpi_thermal_remove(struct acpi_device *device);
98static void acpi_thermal_notify(struct acpi_device *device, u32 event);
99
100static const struct acpi_device_id thermal_device_ids[] = {
101 {ACPI_THERMAL_HID, 0},
102 {"", 0},
103};
104MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
105
106#ifdef CONFIG_PM_SLEEP
107static int acpi_thermal_suspend(struct device *dev);
108static int acpi_thermal_resume(struct device *dev);
109#else
110#define acpi_thermal_suspend NULL
111#define acpi_thermal_resume NULL
112#endif
113static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
114
115static struct acpi_driver acpi_thermal_driver = {
116 .name = "thermal",
117 .class = ACPI_THERMAL_CLASS,
118 .ids = thermal_device_ids,
119 .ops = {
120 .add = acpi_thermal_add,
121 .remove = acpi_thermal_remove,
122 .notify = acpi_thermal_notify,
123 },
124 .drv.pm = &acpi_thermal_pm,
125};
126
127struct acpi_thermal_state {
128 u8 critical:1;
129 u8 hot:1;
130 u8 passive:1;
131 u8 active:1;
132 u8 reserved:4;
133 int active_index;
134};
135
136struct acpi_thermal_state_flags {
137 u8 valid:1;
138 u8 enabled:1;
139 u8 reserved:6;
140};
141
142struct acpi_thermal_critical {
143 struct acpi_thermal_state_flags flags;
144 unsigned long temperature;
145};
146
147struct acpi_thermal_hot {
148 struct acpi_thermal_state_flags flags;
149 unsigned long temperature;
150};
151
152struct acpi_thermal_passive {
153 struct acpi_thermal_state_flags flags;
154 unsigned long temperature;
155 unsigned long tc1;
156 unsigned long tc2;
157 unsigned long tsp;
158 struct acpi_handle_list devices;
159};
160
161struct acpi_thermal_active {
162 struct acpi_thermal_state_flags flags;
163 unsigned long temperature;
164 struct acpi_handle_list devices;
165};
166
167struct acpi_thermal_trips {
168 struct acpi_thermal_critical critical;
169 struct acpi_thermal_hot hot;
170 struct acpi_thermal_passive passive;
171 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
172};
173
174struct acpi_thermal_flags {
175 u8 cooling_mode:1; /* _SCP */
176 u8 devices:1; /* _TZD */
177 u8 reserved:6;
178};
179
180struct acpi_thermal {
181 struct acpi_device * device;
182 acpi_bus_id name;
183 unsigned long temperature;
184 unsigned long last_temperature;
185 unsigned long polling_frequency;
186 volatile u8 zombie;
187 struct acpi_thermal_flags flags;
188 struct acpi_thermal_state state;
189 struct acpi_thermal_trips trips;
190 struct acpi_handle_list devices;
191 struct thermal_zone_device *thermal_zone;
192 int tz_enabled;
193 int kelvin_offset;
194 struct work_struct thermal_check_work;
195};
196
197/* --------------------------------------------------------------------------
198 Thermal Zone Management
199 -------------------------------------------------------------------------- */
200
201static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
202{
203 acpi_status status = AE_OK;
204 unsigned long long tmp;
205
206 if (!tz)
207 return -EINVAL;
208
209 tz->last_temperature = tz->temperature;
210
211 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
212 if (ACPI_FAILURE(status))
213 return -ENODEV;
214
215 tz->temperature = tmp;
216 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
217 tz->temperature));
218
219 return 0;
220}
221
222static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
223{
224 acpi_status status = AE_OK;
225 unsigned long long tmp;
226
227 if (!tz)
228 return -EINVAL;
229
230 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
231 if (ACPI_FAILURE(status))
232 return -ENODEV;
233
234 tz->polling_frequency = tmp;
235 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
236 tz->polling_frequency));
237
238 return 0;
239}
240
241static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
242{
243 if (!tz)
244 return -EINVAL;
245
246 if (!acpi_has_method(tz->device->handle, "_SCP")) {
247 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
248 return -ENODEV;
249 } else if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
250 "_SCP", mode))) {
251 return -ENODEV;
252 }
253
254 return 0;
255}
256
257#define ACPI_TRIPS_CRITICAL 0x01
258#define ACPI_TRIPS_HOT 0x02
259#define ACPI_TRIPS_PASSIVE 0x04
260#define ACPI_TRIPS_ACTIVE 0x08
261#define ACPI_TRIPS_DEVICES 0x10
262
263#define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
264#define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
265
266#define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
267 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
268 ACPI_TRIPS_DEVICES)
269
270/*
271 * This exception is thrown out in two cases:
272 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
273 * when re-evaluating the AML code.
274 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
275 * We need to re-bind the cooling devices of a thermal zone when this occurs.
276 */
277#define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
278do { \
279 if (flags != ACPI_TRIPS_INIT) \
280 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
281 "ACPI thermal trip point %s changed\n" \
282 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
283} while (0)
284
285static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
286{
287 acpi_status status = AE_OK;
288 unsigned long long tmp;
289 struct acpi_handle_list devices;
290 int valid = 0;
291 int i;
292
293 /* Critical Shutdown */
294 if (flag & ACPI_TRIPS_CRITICAL) {
295 status = acpi_evaluate_integer(tz->device->handle,
296 "_CRT", NULL, &tmp);
297 tz->trips.critical.temperature = tmp;
298 /*
299 * Treat freezing temperatures as invalid as well; some
300 * BIOSes return really low values and cause reboots at startup.
301 * Below zero (Celsius) values clearly aren't right for sure..
302 * ... so lets discard those as invalid.
303 */
304 if (ACPI_FAILURE(status)) {
305 tz->trips.critical.flags.valid = 0;
306 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
307 "No critical threshold\n"));
308 } else if (tmp <= 2732) {
309 pr_warn(FW_BUG "Invalid critical threshold (%llu)\n",
310 tmp);
311 tz->trips.critical.flags.valid = 0;
312 } else {
313 tz->trips.critical.flags.valid = 1;
314 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
315 "Found critical threshold [%lu]\n",
316 tz->trips.critical.temperature));
317 }
318 if (tz->trips.critical.flags.valid == 1) {
319 if (crt == -1) {
320 tz->trips.critical.flags.valid = 0;
321 } else if (crt > 0) {
322 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
323 /*
324 * Allow override critical threshold
325 */
326 if (crt_k > tz->trips.critical.temperature)
327 pr_warn(PREFIX "Critical threshold %d C\n",
328 crt);
329 tz->trips.critical.temperature = crt_k;
330 }
331 }
332 }
333
334 /* Critical Sleep (optional) */
335 if (flag & ACPI_TRIPS_HOT) {
336 status = acpi_evaluate_integer(tz->device->handle,
337 "_HOT", NULL, &tmp);
338 if (ACPI_FAILURE(status)) {
339 tz->trips.hot.flags.valid = 0;
340 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
341 "No hot threshold\n"));
342 } else {
343 tz->trips.hot.temperature = tmp;
344 tz->trips.hot.flags.valid = 1;
345 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
346 "Found hot threshold [%lu]\n",
347 tz->trips.hot.temperature));
348 }
349 }
350
351 /* Passive (optional) */
352 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
353 (flag == ACPI_TRIPS_INIT)) {
354 valid = tz->trips.passive.flags.valid;
355 if (psv == -1) {
356 status = AE_SUPPORT;
357 } else if (psv > 0) {
358 tmp = CELSIUS_TO_KELVIN(psv);
359 status = AE_OK;
360 } else {
361 status = acpi_evaluate_integer(tz->device->handle,
362 "_PSV", NULL, &tmp);
363 }
364
365 if (ACPI_FAILURE(status))
366 tz->trips.passive.flags.valid = 0;
367 else {
368 tz->trips.passive.temperature = tmp;
369 tz->trips.passive.flags.valid = 1;
370 if (flag == ACPI_TRIPS_INIT) {
371 status = acpi_evaluate_integer(
372 tz->device->handle, "_TC1",
373 NULL, &tmp);
374 if (ACPI_FAILURE(status))
375 tz->trips.passive.flags.valid = 0;
376 else
377 tz->trips.passive.tc1 = tmp;
378 status = acpi_evaluate_integer(
379 tz->device->handle, "_TC2",
380 NULL, &tmp);
381 if (ACPI_FAILURE(status))
382 tz->trips.passive.flags.valid = 0;
383 else
384 tz->trips.passive.tc2 = tmp;
385 status = acpi_evaluate_integer(
386 tz->device->handle, "_TSP",
387 NULL, &tmp);
388 if (ACPI_FAILURE(status))
389 tz->trips.passive.flags.valid = 0;
390 else
391 tz->trips.passive.tsp = tmp;
392 }
393 }
394 }
395 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
396 memset(&devices, 0, sizeof(struct acpi_handle_list));
397 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
398 NULL, &devices);
399 if (ACPI_FAILURE(status)) {
400 pr_warn(PREFIX "Invalid passive threshold\n");
401 tz->trips.passive.flags.valid = 0;
402 }
403 else
404 tz->trips.passive.flags.valid = 1;
405
406 if (memcmp(&tz->trips.passive.devices, &devices,
407 sizeof(struct acpi_handle_list))) {
408 memcpy(&tz->trips.passive.devices, &devices,
409 sizeof(struct acpi_handle_list));
410 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
411 }
412 }
413 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
414 if (valid != tz->trips.passive.flags.valid)
415 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
416 }
417
418 /* Active (optional) */
419 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
420 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
421 valid = tz->trips.active[i].flags.valid;
422
423 if (act == -1)
424 break; /* disable all active trip points */
425
426 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
427 tz->trips.active[i].flags.valid)) {
428 status = acpi_evaluate_integer(tz->device->handle,
429 name, NULL, &tmp);
430 if (ACPI_FAILURE(status)) {
431 tz->trips.active[i].flags.valid = 0;
432 if (i == 0)
433 break;
434 if (act <= 0)
435 break;
436 if (i == 1)
437 tz->trips.active[0].temperature =
438 CELSIUS_TO_KELVIN(act);
439 else
440 /*
441 * Don't allow override higher than
442 * the next higher trip point
443 */
444 tz->trips.active[i - 1].temperature =
445 (tz->trips.active[i - 2].temperature <
446 CELSIUS_TO_KELVIN(act) ?
447 tz->trips.active[i - 2].temperature :
448 CELSIUS_TO_KELVIN(act));
449 break;
450 } else {
451 tz->trips.active[i].temperature = tmp;
452 tz->trips.active[i].flags.valid = 1;
453 }
454 }
455
456 name[2] = 'L';
457 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
458 memset(&devices, 0, sizeof(struct acpi_handle_list));
459 status = acpi_evaluate_reference(tz->device->handle,
460 name, NULL, &devices);
461 if (ACPI_FAILURE(status)) {
462 pr_warn(PREFIX "Invalid active%d threshold\n",
463 i);
464 tz->trips.active[i].flags.valid = 0;
465 }
466 else
467 tz->trips.active[i].flags.valid = 1;
468
469 if (memcmp(&tz->trips.active[i].devices, &devices,
470 sizeof(struct acpi_handle_list))) {
471 memcpy(&tz->trips.active[i].devices, &devices,
472 sizeof(struct acpi_handle_list));
473 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
474 }
475 }
476 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
477 if (valid != tz->trips.active[i].flags.valid)
478 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
479
480 if (!tz->trips.active[i].flags.valid)
481 break;
482 }
483
484 if ((flag & ACPI_TRIPS_DEVICES)
485 && acpi_has_method(tz->device->handle, "_TZD")) {
486 memset(&devices, 0, sizeof(devices));
487 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
488 NULL, &devices);
489 if (ACPI_SUCCESS(status)
490 && memcmp(&tz->devices, &devices, sizeof(devices))) {
491 tz->devices = devices;
492 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
493 }
494 }
495
496 return 0;
497}
498
499static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
500{
501 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
502
503 if (ret)
504 return ret;
505
506 valid = tz->trips.critical.flags.valid |
507 tz->trips.hot.flags.valid |
508 tz->trips.passive.flags.valid;
509
510 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
511 valid |= tz->trips.active[i].flags.valid;
512
513 if (!valid) {
514 pr_warn(FW_BUG "No valid trip found\n");
515 return -ENODEV;
516 }
517 return 0;
518}
519
520static void acpi_thermal_check(void *data)
521{
522 struct acpi_thermal *tz = data;
523
524 if (!tz->tz_enabled)
525 return;
526
527 thermal_zone_device_update(tz->thermal_zone);
528}
529
530/* sys I/F for generic thermal sysfs support */
531#define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
532
533static int thermal_get_temp(struct thermal_zone_device *thermal,
534 unsigned long *temp)
535{
536 struct acpi_thermal *tz = thermal->devdata;
537 int result;
538
539 if (!tz)
540 return -EINVAL;
541
542 result = acpi_thermal_get_temperature(tz);
543 if (result)
544 return result;
545
546 *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
547 return 0;
548}
549
550static int thermal_get_mode(struct thermal_zone_device *thermal,
551 enum thermal_device_mode *mode)
552{
553 struct acpi_thermal *tz = thermal->devdata;
554
555 if (!tz)
556 return -EINVAL;
557
558 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
559 THERMAL_DEVICE_DISABLED;
560
561 return 0;
562}
563
564static int thermal_set_mode(struct thermal_zone_device *thermal,
565 enum thermal_device_mode mode)
566{
567 struct acpi_thermal *tz = thermal->devdata;
568 int enable;
569
570 if (!tz)
571 return -EINVAL;
572
573 /*
574 * enable/disable thermal management from ACPI thermal driver
575 */
576 if (mode == THERMAL_DEVICE_ENABLED)
577 enable = 1;
578 else if (mode == THERMAL_DEVICE_DISABLED) {
579 enable = 0;
580 pr_warn("thermal zone will be disabled\n");
581 } else
582 return -EINVAL;
583
584 if (enable != tz->tz_enabled) {
585 tz->tz_enabled = enable;
586 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
587 "%s kernel ACPI thermal control\n",
588 tz->tz_enabled ? "Enable" : "Disable"));
589 acpi_thermal_check(tz);
590 }
591 return 0;
592}
593
594static int thermal_get_trip_type(struct thermal_zone_device *thermal,
595 int trip, enum thermal_trip_type *type)
596{
597 struct acpi_thermal *tz = thermal->devdata;
598 int i;
599
600 if (!tz || trip < 0)
601 return -EINVAL;
602
603 if (tz->trips.critical.flags.valid) {
604 if (!trip) {
605 *type = THERMAL_TRIP_CRITICAL;
606 return 0;
607 }
608 trip--;
609 }
610
611 if (tz->trips.hot.flags.valid) {
612 if (!trip) {
613 *type = THERMAL_TRIP_HOT;
614 return 0;
615 }
616 trip--;
617 }
618
619 if (tz->trips.passive.flags.valid) {
620 if (!trip) {
621 *type = THERMAL_TRIP_PASSIVE;
622 return 0;
623 }
624 trip--;
625 }
626
627 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
628 tz->trips.active[i].flags.valid; i++) {
629 if (!trip) {
630 *type = THERMAL_TRIP_ACTIVE;
631 return 0;
632 }
633 trip--;
634 }
635
636 return -EINVAL;
637}
638
639static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
640 int trip, unsigned long *temp)
641{
642 struct acpi_thermal *tz = thermal->devdata;
643 int i;
644
645 if (!tz || trip < 0)
646 return -EINVAL;
647
648 if (tz->trips.critical.flags.valid) {
649 if (!trip) {
650 *temp = KELVIN_TO_MILLICELSIUS(
651 tz->trips.critical.temperature,
652 tz->kelvin_offset);
653 return 0;
654 }
655 trip--;
656 }
657
658 if (tz->trips.hot.flags.valid) {
659 if (!trip) {
660 *temp = KELVIN_TO_MILLICELSIUS(
661 tz->trips.hot.temperature,
662 tz->kelvin_offset);
663 return 0;
664 }
665 trip--;
666 }
667
668 if (tz->trips.passive.flags.valid) {
669 if (!trip) {
670 *temp = KELVIN_TO_MILLICELSIUS(
671 tz->trips.passive.temperature,
672 tz->kelvin_offset);
673 return 0;
674 }
675 trip--;
676 }
677
678 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
679 tz->trips.active[i].flags.valid; i++) {
680 if (!trip) {
681 *temp = KELVIN_TO_MILLICELSIUS(
682 tz->trips.active[i].temperature,
683 tz->kelvin_offset);
684 return 0;
685 }
686 trip--;
687 }
688
689 return -EINVAL;
690}
691
692static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
693 unsigned long *temperature) {
694 struct acpi_thermal *tz = thermal->devdata;
695
696 if (tz->trips.critical.flags.valid) {
697 *temperature = KELVIN_TO_MILLICELSIUS(
698 tz->trips.critical.temperature,
699 tz->kelvin_offset);
700 return 0;
701 } else
702 return -EINVAL;
703}
704
705static int thermal_get_trend(struct thermal_zone_device *thermal,
706 int trip, enum thermal_trend *trend)
707{
708 struct acpi_thermal *tz = thermal->devdata;
709 enum thermal_trip_type type;
710 int i;
711
712 if (thermal_get_trip_type(thermal, trip, &type))
713 return -EINVAL;
714
715 if (type == THERMAL_TRIP_ACTIVE) {
716 unsigned long trip_temp;
717 unsigned long temp = KELVIN_TO_MILLICELSIUS(tz->temperature,
718 tz->kelvin_offset);
719 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
720 return -EINVAL;
721
722 if (temp > trip_temp) {
723 *trend = THERMAL_TREND_RAISING;
724 return 0;
725 } else {
726 /* Fall back on default trend */
727 return -EINVAL;
728 }
729 }
730
731 /*
732 * tz->temperature has already been updated by generic thermal layer,
733 * before this callback being invoked
734 */
735 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
736 + (tz->trips.passive.tc2
737 * (tz->temperature - tz->trips.passive.temperature));
738
739 if (i > 0)
740 *trend = THERMAL_TREND_RAISING;
741 else if (i < 0)
742 *trend = THERMAL_TREND_DROPPING;
743 else
744 *trend = THERMAL_TREND_STABLE;
745 return 0;
746}
747
748
749static int thermal_notify(struct thermal_zone_device *thermal, int trip,
750 enum thermal_trip_type trip_type)
751{
752 u8 type = 0;
753 struct acpi_thermal *tz = thermal->devdata;
754
755 if (trip_type == THERMAL_TRIP_CRITICAL)
756 type = ACPI_THERMAL_NOTIFY_CRITICAL;
757 else if (trip_type == THERMAL_TRIP_HOT)
758 type = ACPI_THERMAL_NOTIFY_HOT;
759 else
760 return 0;
761
762 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
763 dev_name(&tz->device->dev), type, 1);
764
765 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
766 return 1;
767
768 return 0;
769}
770
771static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
772 struct thermal_cooling_device *cdev,
773 bool bind)
774{
775 struct acpi_device *device = cdev->devdata;
776 struct acpi_thermal *tz = thermal->devdata;
777 struct acpi_device *dev;
778 acpi_status status;
779 acpi_handle handle;
780 int i;
781 int j;
782 int trip = -1;
783 int result = 0;
784
785 if (tz->trips.critical.flags.valid)
786 trip++;
787
788 if (tz->trips.hot.flags.valid)
789 trip++;
790
791 if (tz->trips.passive.flags.valid) {
792 trip++;
793 for (i = 0; i < tz->trips.passive.devices.count;
794 i++) {
795 handle = tz->trips.passive.devices.handles[i];
796 status = acpi_bus_get_device(handle, &dev);
797 if (ACPI_FAILURE(status) || dev != device)
798 continue;
799 if (bind)
800 result =
801 thermal_zone_bind_cooling_device
802 (thermal, trip, cdev,
803 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
804 else
805 result =
806 thermal_zone_unbind_cooling_device
807 (thermal, trip, cdev);
808 if (result)
809 goto failed;
810 }
811 }
812
813 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
814 if (!tz->trips.active[i].flags.valid)
815 break;
816 trip++;
817 for (j = 0;
818 j < tz->trips.active[i].devices.count;
819 j++) {
820 handle = tz->trips.active[i].devices.handles[j];
821 status = acpi_bus_get_device(handle, &dev);
822 if (ACPI_FAILURE(status) || dev != device)
823 continue;
824 if (bind)
825 result = thermal_zone_bind_cooling_device
826 (thermal, trip, cdev,
827 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
828 else
829 result = thermal_zone_unbind_cooling_device
830 (thermal, trip, cdev);
831 if (result)
832 goto failed;
833 }
834 }
835
836 for (i = 0; i < tz->devices.count; i++) {
837 handle = tz->devices.handles[i];
838 status = acpi_bus_get_device(handle, &dev);
839 if (ACPI_SUCCESS(status) && (dev == device)) {
840 if (bind)
841 result = thermal_zone_bind_cooling_device
842 (thermal, THERMAL_TRIPS_NONE,
843 cdev, THERMAL_NO_LIMIT,
844 THERMAL_NO_LIMIT);
845 else
846 result = thermal_zone_unbind_cooling_device
847 (thermal, THERMAL_TRIPS_NONE,
848 cdev);
849 if (result)
850 goto failed;
851 }
852 }
853
854failed:
855 return result;
856}
857
858static int
859acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
860 struct thermal_cooling_device *cdev)
861{
862 return acpi_thermal_cooling_device_cb(thermal, cdev, true);
863}
864
865static int
866acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
867 struct thermal_cooling_device *cdev)
868{
869 return acpi_thermal_cooling_device_cb(thermal, cdev, false);
870}
871
872static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
873 .bind = acpi_thermal_bind_cooling_device,
874 .unbind = acpi_thermal_unbind_cooling_device,
875 .get_temp = thermal_get_temp,
876 .get_mode = thermal_get_mode,
877 .set_mode = thermal_set_mode,
878 .get_trip_type = thermal_get_trip_type,
879 .get_trip_temp = thermal_get_trip_temp,
880 .get_crit_temp = thermal_get_crit_temp,
881 .get_trend = thermal_get_trend,
882 .notify = thermal_notify,
883};
884
885static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
886{
887 int trips = 0;
888 int result;
889 acpi_status status;
890 int i;
891
892 if (tz->trips.critical.flags.valid)
893 trips++;
894
895 if (tz->trips.hot.flags.valid)
896 trips++;
897
898 if (tz->trips.passive.flags.valid)
899 trips++;
900
901 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
902 tz->trips.active[i].flags.valid; i++, trips++);
903
904 if (tz->trips.passive.flags.valid)
905 tz->thermal_zone =
906 thermal_zone_device_register("acpitz", trips, 0, tz,
907 &acpi_thermal_zone_ops, NULL,
908 tz->trips.passive.tsp*100,
909 tz->polling_frequency*100);
910 else
911 tz->thermal_zone =
912 thermal_zone_device_register("acpitz", trips, 0, tz,
913 &acpi_thermal_zone_ops, NULL,
914 0, 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 pr_err(PREFIX "Error attaching device data\n");
933 return -ENODEV;
934 }
935
936 tz->tz_enabled = 1;
937
938 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
939 tz->thermal_zone->id);
940 return 0;
941}
942
943static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
944{
945 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
946 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
947 thermal_zone_device_unregister(tz->thermal_zone);
948 tz->thermal_zone = NULL;
949 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
950}
951
952
953/* --------------------------------------------------------------------------
954 Driver Interface
955 -------------------------------------------------------------------------- */
956
957static void acpi_thermal_notify(struct acpi_device *device, u32 event)
958{
959 struct acpi_thermal *tz = acpi_driver_data(device);
960
961
962 if (!tz)
963 return;
964
965 switch (event) {
966 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
967 acpi_thermal_check(tz);
968 break;
969 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
970 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
971 acpi_thermal_check(tz);
972 acpi_bus_generate_netlink_event(device->pnp.device_class,
973 dev_name(&device->dev), event, 0);
974 break;
975 case ACPI_THERMAL_NOTIFY_DEVICES:
976 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
977 acpi_thermal_check(tz);
978 acpi_bus_generate_netlink_event(device->pnp.device_class,
979 dev_name(&device->dev), event, 0);
980 break;
981 default:
982 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
983 "Unsupported event [0x%x]\n", event));
984 break;
985 }
986}
987
988/*
989 * On some platforms, the AML code has dependency about
990 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
991 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
992 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
993 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
994 * if _TMP has never been evaluated.
995 *
996 * As this dependency is totally transparent to OS, evaluate
997 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
998 * _TMP, before they are actually used.
999 */
1000static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
1001{
1002 acpi_handle handle = tz->device->handle;
1003 unsigned long long value;
1004 int i;
1005
1006 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
1007 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
1008 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
1009 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1010 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
1011 acpi_status status;
1012
1013 status = acpi_evaluate_integer(handle, name, NULL, &value);
1014 if (status == AE_NOT_FOUND)
1015 break;
1016 }
1017 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
1018}
1019
1020static int acpi_thermal_get_info(struct acpi_thermal *tz)
1021{
1022 int result = 0;
1023
1024
1025 if (!tz)
1026 return -EINVAL;
1027
1028 acpi_thermal_aml_dependency_fix(tz);
1029
1030 /* Get trip points [_CRT, _PSV, etc.] (required) */
1031 result = acpi_thermal_get_trip_points(tz);
1032 if (result)
1033 return result;
1034
1035 /* Get temperature [_TMP] (required) */
1036 result = acpi_thermal_get_temperature(tz);
1037 if (result)
1038 return result;
1039
1040 /* Set the cooling mode [_SCP] to active cooling (default) */
1041 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1042 if (!result)
1043 tz->flags.cooling_mode = 1;
1044
1045 /* Get default polling frequency [_TZP] (optional) */
1046 if (tzp)
1047 tz->polling_frequency = tzp;
1048 else
1049 acpi_thermal_get_polling_frequency(tz);
1050
1051 return 0;
1052}
1053
1054/*
1055 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1056 * handles temperature values with a single decimal place. As a consequence,
1057 * some implementations use an offset of 273.1 and others use an offset of
1058 * 273.2. Try to find out which one is being used, to present the most
1059 * accurate and visually appealing number.
1060 *
1061 * The heuristic below should work for all ACPI thermal zones which have a
1062 * critical trip point with a value being a multiple of 0.5 degree Celsius.
1063 */
1064static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1065{
1066 if (tz->trips.critical.flags.valid &&
1067 (tz->trips.critical.temperature % 5) == 1)
1068 tz->kelvin_offset = 2731;
1069 else
1070 tz->kelvin_offset = 2732;
1071}
1072
1073static void acpi_thermal_check_fn(struct work_struct *work)
1074{
1075 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1076 thermal_check_work);
1077 acpi_thermal_check(tz);
1078}
1079
1080static int acpi_thermal_add(struct acpi_device *device)
1081{
1082 int result = 0;
1083 struct acpi_thermal *tz = NULL;
1084
1085
1086 if (!device)
1087 return -EINVAL;
1088
1089 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1090 if (!tz)
1091 return -ENOMEM;
1092
1093 tz->device = device;
1094 strcpy(tz->name, device->pnp.bus_id);
1095 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1096 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1097 device->driver_data = tz;
1098
1099 result = acpi_thermal_get_info(tz);
1100 if (result)
1101 goto free_memory;
1102
1103 acpi_thermal_guess_offset(tz);
1104
1105 result = acpi_thermal_register_thermal_zone(tz);
1106 if (result)
1107 goto free_memory;
1108
1109 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1110
1111 pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
1112 acpi_device_bid(device), KELVIN_TO_CELSIUS(tz->temperature));
1113 goto end;
1114
1115free_memory:
1116 kfree(tz);
1117end:
1118 return result;
1119}
1120
1121static int acpi_thermal_remove(struct acpi_device *device)
1122{
1123 struct acpi_thermal *tz = NULL;
1124
1125 if (!device || !acpi_driver_data(device))
1126 return -EINVAL;
1127
1128 flush_workqueue(acpi_thermal_pm_queue);
1129 tz = acpi_driver_data(device);
1130
1131 acpi_thermal_unregister_thermal_zone(tz);
1132 kfree(tz);
1133 return 0;
1134}
1135
1136#ifdef CONFIG_PM_SLEEP
1137static int acpi_thermal_suspend(struct device *dev)
1138{
1139 /* Make sure the previously queued thermal check work has been done */
1140 flush_workqueue(acpi_thermal_pm_queue);
1141 return 0;
1142}
1143
1144static int acpi_thermal_resume(struct device *dev)
1145{
1146 struct acpi_thermal *tz;
1147 int i, j, power_state, result;
1148
1149 if (!dev)
1150 return -EINVAL;
1151
1152 tz = acpi_driver_data(to_acpi_device(dev));
1153 if (!tz)
1154 return -EINVAL;
1155
1156 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1157 if (!(&tz->trips.active[i]))
1158 break;
1159 if (!tz->trips.active[i].flags.valid)
1160 break;
1161 tz->trips.active[i].flags.enabled = 1;
1162 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1163 result = acpi_bus_update_power(
1164 tz->trips.active[i].devices.handles[j],
1165 &power_state);
1166 if (result || (power_state != ACPI_STATE_D0)) {
1167 tz->trips.active[i].flags.enabled = 0;
1168 break;
1169 }
1170 }
1171 tz->state.active |= tz->trips.active[i].flags.enabled;
1172 }
1173
1174 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
1175
1176 return AE_OK;
1177}
1178#endif
1179
1180static int thermal_act(const struct dmi_system_id *d) {
1181
1182 if (act == 0) {
1183 pr_notice(PREFIX "%s detected: "
1184 "disabling all active thermal trip points\n", d->ident);
1185 act = -1;
1186 }
1187 return 0;
1188}
1189static int thermal_nocrt(const struct dmi_system_id *d) {
1190
1191 pr_notice(PREFIX "%s detected: "
1192 "disabling all critical thermal trip point actions.\n", d->ident);
1193 nocrt = 1;
1194 return 0;
1195}
1196static int thermal_tzp(const struct dmi_system_id *d) {
1197
1198 if (tzp == 0) {
1199 pr_notice(PREFIX "%s detected: "
1200 "enabling thermal zone polling\n", d->ident);
1201 tzp = 300; /* 300 dS = 30 Seconds */
1202 }
1203 return 0;
1204}
1205static int thermal_psv(const struct dmi_system_id *d) {
1206
1207 if (psv == 0) {
1208 pr_notice(PREFIX "%s detected: "
1209 "disabling all passive thermal trip points\n", d->ident);
1210 psv = -1;
1211 }
1212 return 0;
1213}
1214
1215static struct dmi_system_id thermal_dmi_table[] __initdata = {
1216 /*
1217 * Award BIOS on this AOpen makes thermal control almost worthless.
1218 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1219 */
1220 {
1221 .callback = thermal_act,
1222 .ident = "AOpen i915GMm-HFS",
1223 .matches = {
1224 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1225 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1226 },
1227 },
1228 {
1229 .callback = thermal_psv,
1230 .ident = "AOpen i915GMm-HFS",
1231 .matches = {
1232 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1233 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1234 },
1235 },
1236 {
1237 .callback = thermal_tzp,
1238 .ident = "AOpen i915GMm-HFS",
1239 .matches = {
1240 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1241 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1242 },
1243 },
1244 {
1245 .callback = thermal_nocrt,
1246 .ident = "Gigabyte GA-7ZX",
1247 .matches = {
1248 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1249 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1250 },
1251 },
1252 {}
1253};
1254
1255static int __init acpi_thermal_init(void)
1256{
1257 int result = 0;
1258
1259 dmi_check_system(thermal_dmi_table);
1260
1261 if (off) {
1262 pr_notice(PREFIX "thermal control disabled\n");
1263 return -ENODEV;
1264 }
1265
1266 acpi_thermal_pm_queue = create_workqueue("acpi_thermal_pm");
1267 if (!acpi_thermal_pm_queue)
1268 return -ENODEV;
1269
1270 result = acpi_bus_register_driver(&acpi_thermal_driver);
1271 if (result < 0) {
1272 destroy_workqueue(acpi_thermal_pm_queue);
1273 return -ENODEV;
1274 }
1275
1276 return 0;
1277}
1278
1279static void __exit acpi_thermal_exit(void)
1280{
1281 acpi_bus_unregister_driver(&acpi_thermal_driver);
1282 destroy_workqueue(acpi_thermal_pm_queue);
1283
1284 return;
1285}
1286
1287module_init(acpi_thermal_init);
1288module_exit(acpi_thermal_exit);