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// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
4 *
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 *
8 * This driver fully implements the ACPI thermal policy as described in the
9 * ACPI 2.0 Specification.
10 *
11 * TBD: 1. Implement passive cooling hysteresis.
12 * 2. Enhance passive cooling (CPU) states/limit interface to support
13 * concepts of 'multiple limiters', upper/lower limits, etc.
14 */
15
16#define pr_fmt(fmt) "ACPI: thermal: " fmt
17
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/dmi.h>
21#include <linux/init.h>
22#include <linux/slab.h>
23#include <linux/types.h>
24#include <linux/jiffies.h>
25#include <linux/kmod.h>
26#include <linux/reboot.h>
27#include <linux/device.h>
28#include <linux/thermal.h>
29#include <linux/acpi.h>
30#include <linux/workqueue.h>
31#include <linux/uaccess.h>
32#include <linux/units.h>
33
34#define ACPI_THERMAL_CLASS "thermal_zone"
35#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
36#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
37#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
38#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
39#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
40#define ACPI_THERMAL_NOTIFY_HOT 0xF1
41#define ACPI_THERMAL_MODE_ACTIVE 0x00
42
43#define ACPI_THERMAL_MAX_ACTIVE 10
44#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
45
46MODULE_AUTHOR("Paul Diefenbaugh");
47MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
48MODULE_LICENSE("GPL");
49
50static int act;
51module_param(act, int, 0644);
52MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
53
54static int crt;
55module_param(crt, int, 0644);
56MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
57
58static int tzp;
59module_param(tzp, int, 0444);
60MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
61
62static int nocrt;
63module_param(nocrt, int, 0);
64MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
65
66static int off;
67module_param(off, int, 0);
68MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
69
70static int psv;
71module_param(psv, int, 0644);
72MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
73
74static struct workqueue_struct *acpi_thermal_pm_queue;
75
76static int acpi_thermal_add(struct acpi_device *device);
77static void acpi_thermal_remove(struct acpi_device *device);
78static void acpi_thermal_notify(struct acpi_device *device, u32 event);
79
80static const struct acpi_device_id thermal_device_ids[] = {
81 {ACPI_THERMAL_HID, 0},
82 {"", 0},
83};
84MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
85
86#ifdef CONFIG_PM_SLEEP
87static int acpi_thermal_suspend(struct device *dev);
88static int acpi_thermal_resume(struct device *dev);
89#else
90#define acpi_thermal_suspend NULL
91#define acpi_thermal_resume NULL
92#endif
93static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
94
95static struct acpi_driver acpi_thermal_driver = {
96 .name = "thermal",
97 .class = ACPI_THERMAL_CLASS,
98 .ids = thermal_device_ids,
99 .ops = {
100 .add = acpi_thermal_add,
101 .remove = acpi_thermal_remove,
102 .notify = acpi_thermal_notify,
103 },
104 .drv.pm = &acpi_thermal_pm,
105};
106
107struct acpi_thermal_state {
108 u8 critical:1;
109 u8 hot:1;
110 u8 passive:1;
111 u8 active:1;
112 u8 reserved:4;
113 int active_index;
114};
115
116struct acpi_thermal_state_flags {
117 u8 valid:1;
118 u8 enabled:1;
119 u8 reserved:6;
120};
121
122struct acpi_thermal_critical {
123 struct acpi_thermal_state_flags flags;
124 unsigned long temperature;
125};
126
127struct acpi_thermal_hot {
128 struct acpi_thermal_state_flags flags;
129 unsigned long temperature;
130};
131
132struct acpi_thermal_passive {
133 struct acpi_thermal_state_flags flags;
134 unsigned long temperature;
135 unsigned long tc1;
136 unsigned long tc2;
137 unsigned long tsp;
138 struct acpi_handle_list devices;
139};
140
141struct acpi_thermal_active {
142 struct acpi_thermal_state_flags flags;
143 unsigned long temperature;
144 struct acpi_handle_list devices;
145};
146
147struct acpi_thermal_trips {
148 struct acpi_thermal_critical critical;
149 struct acpi_thermal_hot hot;
150 struct acpi_thermal_passive passive;
151 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
152};
153
154struct acpi_thermal_flags {
155 u8 cooling_mode:1; /* _SCP */
156 u8 devices:1; /* _TZD */
157 u8 reserved:6;
158};
159
160struct acpi_thermal {
161 struct acpi_device *device;
162 acpi_bus_id name;
163 unsigned long temperature;
164 unsigned long last_temperature;
165 unsigned long polling_frequency;
166 volatile u8 zombie;
167 struct acpi_thermal_flags flags;
168 struct acpi_thermal_state state;
169 struct acpi_thermal_trips trips;
170 struct acpi_handle_list devices;
171 struct thermal_zone_device *thermal_zone;
172 int kelvin_offset; /* in millidegrees */
173 struct work_struct thermal_check_work;
174 struct mutex thermal_check_lock;
175 refcount_t thermal_check_count;
176};
177
178/* --------------------------------------------------------------------------
179 Thermal Zone Management
180 -------------------------------------------------------------------------- */
181
182static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
183{
184 acpi_status status = AE_OK;
185 unsigned long long tmp;
186
187 if (!tz)
188 return -EINVAL;
189
190 tz->last_temperature = tz->temperature;
191
192 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
193 if (ACPI_FAILURE(status))
194 return -ENODEV;
195
196 tz->temperature = tmp;
197
198 acpi_handle_debug(tz->device->handle, "Temperature is %lu dK\n",
199 tz->temperature);
200
201 return 0;
202}
203
204static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
205{
206 acpi_status status = AE_OK;
207 unsigned long long tmp;
208
209 if (!tz)
210 return -EINVAL;
211
212 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
213 if (ACPI_FAILURE(status))
214 return -ENODEV;
215
216 tz->polling_frequency = tmp;
217 acpi_handle_debug(tz->device->handle, "Polling frequency is %lu dS\n",
218 tz->polling_frequency);
219
220 return 0;
221}
222
223static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
224{
225 if (!tz)
226 return -EINVAL;
227
228 if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
229 "_SCP", mode)))
230 return -ENODEV;
231
232 return 0;
233}
234
235#define ACPI_TRIPS_CRITICAL 0x01
236#define ACPI_TRIPS_HOT 0x02
237#define ACPI_TRIPS_PASSIVE 0x04
238#define ACPI_TRIPS_ACTIVE 0x08
239#define ACPI_TRIPS_DEVICES 0x10
240
241#define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
242#define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
243
244#define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
245 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
246 ACPI_TRIPS_DEVICES)
247
248/*
249 * This exception is thrown out in two cases:
250 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
251 * when re-evaluating the AML code.
252 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
253 * We need to re-bind the cooling devices of a thermal zone when this occurs.
254 */
255#define ACPI_THERMAL_TRIPS_EXCEPTION(flags, tz, str) \
256do { \
257 if (flags != ACPI_TRIPS_INIT) \
258 acpi_handle_info(tz->device->handle, \
259 "ACPI thermal trip point %s changed\n" \
260 "Please report to linux-acpi@vger.kernel.org\n", str); \
261} while (0)
262
263static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
264{
265 acpi_status status;
266 unsigned long long tmp;
267 struct acpi_handle_list devices;
268 int valid = 0;
269 int i;
270
271 /* Critical Shutdown */
272 if (flag & ACPI_TRIPS_CRITICAL) {
273 status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL, &tmp);
274 tz->trips.critical.temperature = tmp;
275 /*
276 * Treat freezing temperatures as invalid as well; some
277 * BIOSes return really low values and cause reboots at startup.
278 * Below zero (Celsius) values clearly aren't right for sure..
279 * ... so lets discard those as invalid.
280 */
281 if (ACPI_FAILURE(status)) {
282 tz->trips.critical.flags.valid = 0;
283 acpi_handle_debug(tz->device->handle,
284 "No critical threshold\n");
285 } else if (tmp <= 2732) {
286 pr_info(FW_BUG "Invalid critical threshold (%llu)\n", tmp);
287 tz->trips.critical.flags.valid = 0;
288 } else {
289 tz->trips.critical.flags.valid = 1;
290 acpi_handle_debug(tz->device->handle,
291 "Found critical threshold [%lu]\n",
292 tz->trips.critical.temperature);
293 }
294 if (tz->trips.critical.flags.valid) {
295 if (crt == -1) {
296 tz->trips.critical.flags.valid = 0;
297 } else if (crt > 0) {
298 unsigned long crt_k = celsius_to_deci_kelvin(crt);
299
300 /*
301 * Allow override critical threshold
302 */
303 if (crt_k > tz->trips.critical.temperature)
304 pr_info("Critical threshold %d C\n", crt);
305
306 tz->trips.critical.temperature = crt_k;
307 }
308 }
309 }
310
311 /* Critical Sleep (optional) */
312 if (flag & ACPI_TRIPS_HOT) {
313 status = acpi_evaluate_integer(tz->device->handle, "_HOT", NULL, &tmp);
314 if (ACPI_FAILURE(status)) {
315 tz->trips.hot.flags.valid = 0;
316 acpi_handle_debug(tz->device->handle,
317 "No hot threshold\n");
318 } else {
319 tz->trips.hot.temperature = tmp;
320 tz->trips.hot.flags.valid = 1;
321 acpi_handle_debug(tz->device->handle,
322 "Found hot threshold [%lu]\n",
323 tz->trips.hot.temperature);
324 }
325 }
326
327 /* Passive (optional) */
328 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
329 flag == ACPI_TRIPS_INIT) {
330 valid = tz->trips.passive.flags.valid;
331 if (psv == -1) {
332 status = AE_SUPPORT;
333 } else if (psv > 0) {
334 tmp = celsius_to_deci_kelvin(psv);
335 status = AE_OK;
336 } else {
337 status = acpi_evaluate_integer(tz->device->handle,
338 "_PSV", NULL, &tmp);
339 }
340
341 if (ACPI_FAILURE(status)) {
342 tz->trips.passive.flags.valid = 0;
343 } else {
344 tz->trips.passive.temperature = tmp;
345 tz->trips.passive.flags.valid = 1;
346 if (flag == ACPI_TRIPS_INIT) {
347 status = acpi_evaluate_integer(tz->device->handle,
348 "_TC1", NULL, &tmp);
349 if (ACPI_FAILURE(status))
350 tz->trips.passive.flags.valid = 0;
351 else
352 tz->trips.passive.tc1 = tmp;
353
354 status = acpi_evaluate_integer(tz->device->handle,
355 "_TC2", NULL, &tmp);
356 if (ACPI_FAILURE(status))
357 tz->trips.passive.flags.valid = 0;
358 else
359 tz->trips.passive.tc2 = tmp;
360
361 status = acpi_evaluate_integer(tz->device->handle,
362 "_TSP", NULL, &tmp);
363 if (ACPI_FAILURE(status))
364 tz->trips.passive.flags.valid = 0;
365 else
366 tz->trips.passive.tsp = tmp;
367 }
368 }
369 }
370 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
371 memset(&devices, 0, sizeof(struct acpi_handle_list));
372 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
373 NULL, &devices);
374 if (ACPI_FAILURE(status)) {
375 acpi_handle_info(tz->device->handle,
376 "Invalid passive threshold\n");
377 tz->trips.passive.flags.valid = 0;
378 } else {
379 tz->trips.passive.flags.valid = 1;
380 }
381
382 if (memcmp(&tz->trips.passive.devices, &devices,
383 sizeof(struct acpi_handle_list))) {
384 memcpy(&tz->trips.passive.devices, &devices,
385 sizeof(struct acpi_handle_list));
386 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
387 }
388 }
389 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
390 if (valid != tz->trips.passive.flags.valid)
391 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
392 }
393
394 /* Active (optional) */
395 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
396 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
397 valid = tz->trips.active[i].flags.valid;
398
399 if (act == -1)
400 break; /* disable all active trip points */
401
402 if (flag == ACPI_TRIPS_INIT || ((flag & ACPI_TRIPS_ACTIVE) &&
403 tz->trips.active[i].flags.valid)) {
404 status = acpi_evaluate_integer(tz->device->handle,
405 name, NULL, &tmp);
406 if (ACPI_FAILURE(status)) {
407 tz->trips.active[i].flags.valid = 0;
408 if (i == 0)
409 break;
410
411 if (act <= 0)
412 break;
413
414 if (i == 1)
415 tz->trips.active[0].temperature = celsius_to_deci_kelvin(act);
416 else
417 /*
418 * Don't allow override higher than
419 * the next higher trip point
420 */
421 tz->trips.active[i-1].temperature =
422 (tz->trips.active[i-2].temperature <
423 celsius_to_deci_kelvin(act) ?
424 tz->trips.active[i-2].temperature :
425 celsius_to_deci_kelvin(act));
426
427 break;
428 } else {
429 tz->trips.active[i].temperature = tmp;
430 tz->trips.active[i].flags.valid = 1;
431 }
432 }
433
434 name[2] = 'L';
435 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid) {
436 memset(&devices, 0, sizeof(struct acpi_handle_list));
437 status = acpi_evaluate_reference(tz->device->handle,
438 name, NULL, &devices);
439 if (ACPI_FAILURE(status)) {
440 acpi_handle_info(tz->device->handle,
441 "Invalid active%d threshold\n", i);
442 tz->trips.active[i].flags.valid = 0;
443 } else {
444 tz->trips.active[i].flags.valid = 1;
445 }
446
447 if (memcmp(&tz->trips.active[i].devices, &devices,
448 sizeof(struct acpi_handle_list))) {
449 memcpy(&tz->trips.active[i].devices, &devices,
450 sizeof(struct acpi_handle_list));
451 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
452 }
453 }
454 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
455 if (valid != tz->trips.active[i].flags.valid)
456 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
457
458 if (!tz->trips.active[i].flags.valid)
459 break;
460 }
461
462 if (flag & ACPI_TRIPS_DEVICES) {
463 memset(&devices, 0, sizeof(devices));
464 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
465 NULL, &devices);
466 if (ACPI_SUCCESS(status) &&
467 memcmp(&tz->devices, &devices, sizeof(devices))) {
468 tz->devices = devices;
469 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
470 }
471 }
472
473 return 0;
474}
475
476static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
477{
478 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
479
480 if (ret)
481 return ret;
482
483 valid = tz->trips.critical.flags.valid |
484 tz->trips.hot.flags.valid |
485 tz->trips.passive.flags.valid;
486
487 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
488 valid |= tz->trips.active[i].flags.valid;
489
490 if (!valid) {
491 pr_warn(FW_BUG "No valid trip found\n");
492 return -ENODEV;
493 }
494 return 0;
495}
496
497/* sys I/F for generic thermal sysfs support */
498
499static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
500{
501 struct acpi_thermal *tz = thermal->devdata;
502 int result;
503
504 if (!tz)
505 return -EINVAL;
506
507 result = acpi_thermal_get_temperature(tz);
508 if (result)
509 return result;
510
511 *temp = deci_kelvin_to_millicelsius_with_offset(tz->temperature,
512 tz->kelvin_offset);
513 return 0;
514}
515
516static int thermal_get_trip_type(struct thermal_zone_device *thermal,
517 int trip, enum thermal_trip_type *type)
518{
519 struct acpi_thermal *tz = thermal->devdata;
520 int i;
521
522 if (!tz || trip < 0)
523 return -EINVAL;
524
525 if (tz->trips.critical.flags.valid) {
526 if (!trip) {
527 *type = THERMAL_TRIP_CRITICAL;
528 return 0;
529 }
530 trip--;
531 }
532
533 if (tz->trips.hot.flags.valid) {
534 if (!trip) {
535 *type = THERMAL_TRIP_HOT;
536 return 0;
537 }
538 trip--;
539 }
540
541 if (tz->trips.passive.flags.valid) {
542 if (!trip) {
543 *type = THERMAL_TRIP_PASSIVE;
544 return 0;
545 }
546 trip--;
547 }
548
549 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && tz->trips.active[i].flags.valid; i++) {
550 if (!trip) {
551 *type = THERMAL_TRIP_ACTIVE;
552 return 0;
553 }
554 trip--;
555 }
556
557 return -EINVAL;
558}
559
560static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
561 int trip, int *temp)
562{
563 struct acpi_thermal *tz = thermal->devdata;
564 int i;
565
566 if (!tz || trip < 0)
567 return -EINVAL;
568
569 if (tz->trips.critical.flags.valid) {
570 if (!trip) {
571 *temp = deci_kelvin_to_millicelsius_with_offset(
572 tz->trips.critical.temperature,
573 tz->kelvin_offset);
574 return 0;
575 }
576 trip--;
577 }
578
579 if (tz->trips.hot.flags.valid) {
580 if (!trip) {
581 *temp = deci_kelvin_to_millicelsius_with_offset(
582 tz->trips.hot.temperature,
583 tz->kelvin_offset);
584 return 0;
585 }
586 trip--;
587 }
588
589 if (tz->trips.passive.flags.valid) {
590 if (!trip) {
591 *temp = deci_kelvin_to_millicelsius_with_offset(
592 tz->trips.passive.temperature,
593 tz->kelvin_offset);
594 return 0;
595 }
596 trip--;
597 }
598
599 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
600 tz->trips.active[i].flags.valid; i++) {
601 if (!trip) {
602 *temp = deci_kelvin_to_millicelsius_with_offset(
603 tz->trips.active[i].temperature,
604 tz->kelvin_offset);
605 return 0;
606 }
607 trip--;
608 }
609
610 return -EINVAL;
611}
612
613static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
614 int *temperature)
615{
616 struct acpi_thermal *tz = thermal->devdata;
617
618 if (tz->trips.critical.flags.valid) {
619 *temperature = deci_kelvin_to_millicelsius_with_offset(
620 tz->trips.critical.temperature,
621 tz->kelvin_offset);
622 return 0;
623 }
624
625 return -EINVAL;
626}
627
628static int thermal_get_trend(struct thermal_zone_device *thermal,
629 int trip, enum thermal_trend *trend)
630{
631 struct acpi_thermal *tz = thermal->devdata;
632 enum thermal_trip_type type;
633 int i;
634
635 if (thermal_get_trip_type(thermal, trip, &type))
636 return -EINVAL;
637
638 if (type == THERMAL_TRIP_ACTIVE) {
639 int trip_temp;
640 int temp = deci_kelvin_to_millicelsius_with_offset(
641 tz->temperature, tz->kelvin_offset);
642 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
643 return -EINVAL;
644
645 if (temp > trip_temp) {
646 *trend = THERMAL_TREND_RAISING;
647 return 0;
648 } else {
649 /* Fall back on default trend */
650 return -EINVAL;
651 }
652 }
653
654 /*
655 * tz->temperature has already been updated by generic thermal layer,
656 * before this callback being invoked
657 */
658 i = tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature) +
659 tz->trips.passive.tc2 * (tz->temperature - tz->trips.passive.temperature);
660
661 if (i > 0)
662 *trend = THERMAL_TREND_RAISING;
663 else if (i < 0)
664 *trend = THERMAL_TREND_DROPPING;
665 else
666 *trend = THERMAL_TREND_STABLE;
667
668 return 0;
669}
670
671static void acpi_thermal_zone_device_hot(struct thermal_zone_device *thermal)
672{
673 struct acpi_thermal *tz = thermal->devdata;
674
675 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
676 dev_name(&tz->device->dev),
677 ACPI_THERMAL_NOTIFY_HOT, 1);
678}
679
680static void acpi_thermal_zone_device_critical(struct thermal_zone_device *thermal)
681{
682 struct acpi_thermal *tz = thermal->devdata;
683
684 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
685 dev_name(&tz->device->dev),
686 ACPI_THERMAL_NOTIFY_CRITICAL, 1);
687
688 thermal_zone_device_critical(thermal);
689}
690
691static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
692 struct thermal_cooling_device *cdev,
693 bool bind)
694{
695 struct acpi_device *device = cdev->devdata;
696 struct acpi_thermal *tz = thermal->devdata;
697 struct acpi_device *dev;
698 acpi_handle handle;
699 int i;
700 int j;
701 int trip = -1;
702 int result = 0;
703
704 if (tz->trips.critical.flags.valid)
705 trip++;
706
707 if (tz->trips.hot.flags.valid)
708 trip++;
709
710 if (tz->trips.passive.flags.valid) {
711 trip++;
712 for (i = 0; i < tz->trips.passive.devices.count; i++) {
713 handle = tz->trips.passive.devices.handles[i];
714 dev = acpi_fetch_acpi_dev(handle);
715 if (dev != device)
716 continue;
717
718 if (bind)
719 result = thermal_zone_bind_cooling_device(
720 thermal, trip, cdev,
721 THERMAL_NO_LIMIT,
722 THERMAL_NO_LIMIT,
723 THERMAL_WEIGHT_DEFAULT);
724 else
725 result =
726 thermal_zone_unbind_cooling_device(
727 thermal, trip, cdev);
728
729 if (result)
730 goto failed;
731 }
732 }
733
734 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
735 if (!tz->trips.active[i].flags.valid)
736 break;
737
738 trip++;
739 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
740 handle = tz->trips.active[i].devices.handles[j];
741 dev = acpi_fetch_acpi_dev(handle);
742 if (dev != device)
743 continue;
744
745 if (bind)
746 result = thermal_zone_bind_cooling_device(
747 thermal, trip, cdev,
748 THERMAL_NO_LIMIT,
749 THERMAL_NO_LIMIT,
750 THERMAL_WEIGHT_DEFAULT);
751 else
752 result = thermal_zone_unbind_cooling_device(
753 thermal, trip, cdev);
754
755 if (result)
756 goto failed;
757 }
758 }
759
760failed:
761 return result;
762}
763
764static int
765acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
766 struct thermal_cooling_device *cdev)
767{
768 return acpi_thermal_cooling_device_cb(thermal, cdev, true);
769}
770
771static int
772acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
773 struct thermal_cooling_device *cdev)
774{
775 return acpi_thermal_cooling_device_cb(thermal, cdev, false);
776}
777
778static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
779 .bind = acpi_thermal_bind_cooling_device,
780 .unbind = acpi_thermal_unbind_cooling_device,
781 .get_temp = thermal_get_temp,
782 .get_trip_type = thermal_get_trip_type,
783 .get_trip_temp = thermal_get_trip_temp,
784 .get_crit_temp = thermal_get_crit_temp,
785 .get_trend = thermal_get_trend,
786 .hot = acpi_thermal_zone_device_hot,
787 .critical = acpi_thermal_zone_device_critical,
788};
789
790static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
791{
792 int trips = 0;
793 int result;
794 acpi_status status;
795 int i;
796
797 if (tz->trips.critical.flags.valid)
798 trips++;
799
800 if (tz->trips.hot.flags.valid)
801 trips++;
802
803 if (tz->trips.passive.flags.valid)
804 trips++;
805
806 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && tz->trips.active[i].flags.valid;
807 i++, trips++);
808
809 if (tz->trips.passive.flags.valid)
810 tz->thermal_zone = thermal_zone_device_register("acpitz", trips, 0, tz,
811 &acpi_thermal_zone_ops, NULL,
812 tz->trips.passive.tsp * 100,
813 tz->polling_frequency * 100);
814 else
815 tz->thermal_zone =
816 thermal_zone_device_register("acpitz", trips, 0, tz,
817 &acpi_thermal_zone_ops, NULL,
818 0, tz->polling_frequency * 100);
819
820 if (IS_ERR(tz->thermal_zone))
821 return -ENODEV;
822
823 result = sysfs_create_link(&tz->device->dev.kobj,
824 &tz->thermal_zone->device.kobj, "thermal_zone");
825 if (result)
826 goto unregister_tzd;
827
828 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
829 &tz->device->dev.kobj, "device");
830 if (result)
831 goto remove_tz_link;
832
833 status = acpi_bus_attach_private_data(tz->device->handle,
834 tz->thermal_zone);
835 if (ACPI_FAILURE(status)) {
836 result = -ENODEV;
837 goto remove_dev_link;
838 }
839
840 result = thermal_zone_device_enable(tz->thermal_zone);
841 if (result)
842 goto acpi_bus_detach;
843
844 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
845 tz->thermal_zone->id);
846
847 return 0;
848
849acpi_bus_detach:
850 acpi_bus_detach_private_data(tz->device->handle);
851remove_dev_link:
852 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
853remove_tz_link:
854 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
855unregister_tzd:
856 thermal_zone_device_unregister(tz->thermal_zone);
857
858 return result;
859}
860
861static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
862{
863 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
864 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
865 thermal_zone_device_unregister(tz->thermal_zone);
866 tz->thermal_zone = NULL;
867 acpi_bus_detach_private_data(tz->device->handle);
868}
869
870
871/* --------------------------------------------------------------------------
872 Driver Interface
873 -------------------------------------------------------------------------- */
874
875static void acpi_queue_thermal_check(struct acpi_thermal *tz)
876{
877 if (!work_pending(&tz->thermal_check_work))
878 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
879}
880
881static void acpi_thermal_notify(struct acpi_device *device, u32 event)
882{
883 struct acpi_thermal *tz = acpi_driver_data(device);
884
885 if (!tz)
886 return;
887
888 switch (event) {
889 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
890 acpi_queue_thermal_check(tz);
891 break;
892 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
893 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
894 acpi_queue_thermal_check(tz);
895 acpi_bus_generate_netlink_event(device->pnp.device_class,
896 dev_name(&device->dev), event, 0);
897 break;
898 case ACPI_THERMAL_NOTIFY_DEVICES:
899 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
900 acpi_queue_thermal_check(tz);
901 acpi_bus_generate_netlink_event(device->pnp.device_class,
902 dev_name(&device->dev), event, 0);
903 break;
904 default:
905 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
906 event);
907 break;
908 }
909}
910
911/*
912 * On some platforms, the AML code has dependency about
913 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
914 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
915 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
916 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
917 * if _TMP has never been evaluated.
918 *
919 * As this dependency is totally transparent to OS, evaluate
920 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
921 * _TMP, before they are actually used.
922 */
923static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
924{
925 acpi_handle handle = tz->device->handle;
926 unsigned long long value;
927 int i;
928
929 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
930 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
931 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
932 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
933 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
934 acpi_status status;
935
936 status = acpi_evaluate_integer(handle, name, NULL, &value);
937 if (status == AE_NOT_FOUND)
938 break;
939 }
940 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
941}
942
943static int acpi_thermal_get_info(struct acpi_thermal *tz)
944{
945 int result;
946
947 if (!tz)
948 return -EINVAL;
949
950 acpi_thermal_aml_dependency_fix(tz);
951
952 /* Get trip points [_CRT, _PSV, etc.] (required) */
953 result = acpi_thermal_get_trip_points(tz);
954 if (result)
955 return result;
956
957 /* Get temperature [_TMP] (required) */
958 result = acpi_thermal_get_temperature(tz);
959 if (result)
960 return result;
961
962 /* Set the cooling mode [_SCP] to active cooling (default) */
963 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
964 if (!result)
965 tz->flags.cooling_mode = 1;
966
967 /* Get default polling frequency [_TZP] (optional) */
968 if (tzp)
969 tz->polling_frequency = tzp;
970 else
971 acpi_thermal_get_polling_frequency(tz);
972
973 return 0;
974}
975
976/*
977 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
978 * handles temperature values with a single decimal place. As a consequence,
979 * some implementations use an offset of 273.1 and others use an offset of
980 * 273.2. Try to find out which one is being used, to present the most
981 * accurate and visually appealing number.
982 *
983 * The heuristic below should work for all ACPI thermal zones which have a
984 * critical trip point with a value being a multiple of 0.5 degree Celsius.
985 */
986static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
987{
988 if (tz->trips.critical.flags.valid &&
989 (tz->trips.critical.temperature % 5) == 1)
990 tz->kelvin_offset = 273100;
991 else
992 tz->kelvin_offset = 273200;
993}
994
995static void acpi_thermal_check_fn(struct work_struct *work)
996{
997 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
998 thermal_check_work);
999
1000 /*
1001 * In general, it is not sufficient to check the pending bit, because
1002 * subsequent instances of this function may be queued after one of them
1003 * has started running (e.g. if _TMP sleeps). Avoid bailing out if just
1004 * one of them is running, though, because it may have done the actual
1005 * check some time ago, so allow at least one of them to block on the
1006 * mutex while another one is running the update.
1007 */
1008 if (!refcount_dec_not_one(&tz->thermal_check_count))
1009 return;
1010
1011 mutex_lock(&tz->thermal_check_lock);
1012
1013 thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED);
1014
1015 refcount_inc(&tz->thermal_check_count);
1016
1017 mutex_unlock(&tz->thermal_check_lock);
1018}
1019
1020static int acpi_thermal_add(struct acpi_device *device)
1021{
1022 struct acpi_thermal *tz;
1023 int result;
1024
1025 if (!device)
1026 return -EINVAL;
1027
1028 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1029 if (!tz)
1030 return -ENOMEM;
1031
1032 tz->device = device;
1033 strcpy(tz->name, device->pnp.bus_id);
1034 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1035 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1036 device->driver_data = tz;
1037
1038 result = acpi_thermal_get_info(tz);
1039 if (result)
1040 goto free_memory;
1041
1042 acpi_thermal_guess_offset(tz);
1043
1044 result = acpi_thermal_register_thermal_zone(tz);
1045 if (result)
1046 goto free_memory;
1047
1048 refcount_set(&tz->thermal_check_count, 3);
1049 mutex_init(&tz->thermal_check_lock);
1050 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1051
1052 pr_info("%s [%s] (%ld C)\n", acpi_device_name(device),
1053 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temperature));
1054 goto end;
1055
1056free_memory:
1057 kfree(tz);
1058end:
1059 return result;
1060}
1061
1062static void acpi_thermal_remove(struct acpi_device *device)
1063{
1064 struct acpi_thermal *tz;
1065
1066 if (!device || !acpi_driver_data(device))
1067 return;
1068
1069 flush_workqueue(acpi_thermal_pm_queue);
1070 tz = acpi_driver_data(device);
1071
1072 acpi_thermal_unregister_thermal_zone(tz);
1073 kfree(tz);
1074}
1075
1076#ifdef CONFIG_PM_SLEEP
1077static int acpi_thermal_suspend(struct device *dev)
1078{
1079 /* Make sure the previously queued thermal check work has been done */
1080 flush_workqueue(acpi_thermal_pm_queue);
1081 return 0;
1082}
1083
1084static int acpi_thermal_resume(struct device *dev)
1085{
1086 struct acpi_thermal *tz;
1087 int i, j, power_state, result;
1088
1089 if (!dev)
1090 return -EINVAL;
1091
1092 tz = acpi_driver_data(to_acpi_device(dev));
1093 if (!tz)
1094 return -EINVAL;
1095
1096 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1097 if (!tz->trips.active[i].flags.valid)
1098 break;
1099
1100 tz->trips.active[i].flags.enabled = 1;
1101 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1102 result = acpi_bus_update_power(
1103 tz->trips.active[i].devices.handles[j],
1104 &power_state);
1105 if (result || (power_state != ACPI_STATE_D0)) {
1106 tz->trips.active[i].flags.enabled = 0;
1107 break;
1108 }
1109 }
1110 tz->state.active |= tz->trips.active[i].flags.enabled;
1111 }
1112
1113 acpi_queue_thermal_check(tz);
1114
1115 return AE_OK;
1116}
1117#endif
1118
1119static int thermal_act(const struct dmi_system_id *d) {
1120 if (act == 0) {
1121 pr_notice("%s detected: disabling all active thermal trip points\n",
1122 d->ident);
1123 act = -1;
1124 }
1125 return 0;
1126}
1127static int thermal_nocrt(const struct dmi_system_id *d) {
1128 pr_notice("%s detected: disabling all critical thermal trip point actions.\n",
1129 d->ident);
1130 nocrt = 1;
1131 return 0;
1132}
1133static int thermal_tzp(const struct dmi_system_id *d) {
1134 if (tzp == 0) {
1135 pr_notice("%s detected: enabling thermal zone polling\n",
1136 d->ident);
1137 tzp = 300; /* 300 dS = 30 Seconds */
1138 }
1139 return 0;
1140}
1141static int thermal_psv(const struct dmi_system_id *d) {
1142 if (psv == 0) {
1143 pr_notice("%s detected: disabling all passive thermal trip points\n",
1144 d->ident);
1145 psv = -1;
1146 }
1147 return 0;
1148}
1149
1150static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1151 /*
1152 * Award BIOS on this AOpen makes thermal control almost worthless.
1153 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1154 */
1155 {
1156 .callback = thermal_act,
1157 .ident = "AOpen i915GMm-HFS",
1158 .matches = {
1159 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1160 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1161 },
1162 },
1163 {
1164 .callback = thermal_psv,
1165 .ident = "AOpen i915GMm-HFS",
1166 .matches = {
1167 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1168 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1169 },
1170 },
1171 {
1172 .callback = thermal_tzp,
1173 .ident = "AOpen i915GMm-HFS",
1174 .matches = {
1175 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1176 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1177 },
1178 },
1179 {
1180 .callback = thermal_nocrt,
1181 .ident = "Gigabyte GA-7ZX",
1182 .matches = {
1183 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1184 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1185 },
1186 },
1187 {}
1188};
1189
1190static int __init acpi_thermal_init(void)
1191{
1192 int result;
1193
1194 dmi_check_system(thermal_dmi_table);
1195
1196 if (off) {
1197 pr_notice("thermal control disabled\n");
1198 return -ENODEV;
1199 }
1200
1201 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1202 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1203 if (!acpi_thermal_pm_queue)
1204 return -ENODEV;
1205
1206 result = acpi_bus_register_driver(&acpi_thermal_driver);
1207 if (result < 0) {
1208 destroy_workqueue(acpi_thermal_pm_queue);
1209 return -ENODEV;
1210 }
1211
1212 return 0;
1213}
1214
1215static void __exit acpi_thermal_exit(void)
1216{
1217 acpi_bus_unregister_driver(&acpi_thermal_driver);
1218 destroy_workqueue(acpi_thermal_pm_queue);
1219}
1220
1221module_init(acpi_thermal_init);
1222module_exit(acpi_thermal_exit);