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 <linux/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 THERMAL_EVENT_UNSPECIFIED);
525}
526
527/* sys I/F for generic thermal sysfs support */
528
529static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
530{
531 struct acpi_thermal *tz = thermal->devdata;
532 int result;
533
534 if (!tz)
535 return -EINVAL;
536
537 result = acpi_thermal_get_temperature(tz);
538 if (result)
539 return result;
540
541 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(tz->temperature,
542 tz->kelvin_offset);
543 return 0;
544}
545
546static int thermal_get_mode(struct thermal_zone_device *thermal,
547 enum thermal_device_mode *mode)
548{
549 struct acpi_thermal *tz = thermal->devdata;
550
551 if (!tz)
552 return -EINVAL;
553
554 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
555 THERMAL_DEVICE_DISABLED;
556
557 return 0;
558}
559
560static int thermal_set_mode(struct thermal_zone_device *thermal,
561 enum thermal_device_mode mode)
562{
563 struct acpi_thermal *tz = thermal->devdata;
564 int enable;
565
566 if (!tz)
567 return -EINVAL;
568
569 /*
570 * enable/disable thermal management from ACPI thermal driver
571 */
572 if (mode == THERMAL_DEVICE_ENABLED)
573 enable = 1;
574 else if (mode == THERMAL_DEVICE_DISABLED) {
575 enable = 0;
576 pr_warn("thermal zone will be disabled\n");
577 } else
578 return -EINVAL;
579
580 if (enable != tz->tz_enabled) {
581 tz->tz_enabled = enable;
582 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
583 "%s kernel ACPI thermal control\n",
584 tz->tz_enabled ? "Enable" : "Disable"));
585 acpi_thermal_check(tz);
586 }
587 return 0;
588}
589
590static int thermal_get_trip_type(struct thermal_zone_device *thermal,
591 int trip, enum thermal_trip_type *type)
592{
593 struct acpi_thermal *tz = thermal->devdata;
594 int i;
595
596 if (!tz || trip < 0)
597 return -EINVAL;
598
599 if (tz->trips.critical.flags.valid) {
600 if (!trip) {
601 *type = THERMAL_TRIP_CRITICAL;
602 return 0;
603 }
604 trip--;
605 }
606
607 if (tz->trips.hot.flags.valid) {
608 if (!trip) {
609 *type = THERMAL_TRIP_HOT;
610 return 0;
611 }
612 trip--;
613 }
614
615 if (tz->trips.passive.flags.valid) {
616 if (!trip) {
617 *type = THERMAL_TRIP_PASSIVE;
618 return 0;
619 }
620 trip--;
621 }
622
623 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
624 tz->trips.active[i].flags.valid; i++) {
625 if (!trip) {
626 *type = THERMAL_TRIP_ACTIVE;
627 return 0;
628 }
629 trip--;
630 }
631
632 return -EINVAL;
633}
634
635static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
636 int trip, int *temp)
637{
638 struct acpi_thermal *tz = thermal->devdata;
639 int i;
640
641 if (!tz || trip < 0)
642 return -EINVAL;
643
644 if (tz->trips.critical.flags.valid) {
645 if (!trip) {
646 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
647 tz->trips.critical.temperature,
648 tz->kelvin_offset);
649 return 0;
650 }
651 trip--;
652 }
653
654 if (tz->trips.hot.flags.valid) {
655 if (!trip) {
656 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
657 tz->trips.hot.temperature,
658 tz->kelvin_offset);
659 return 0;
660 }
661 trip--;
662 }
663
664 if (tz->trips.passive.flags.valid) {
665 if (!trip) {
666 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
667 tz->trips.passive.temperature,
668 tz->kelvin_offset);
669 return 0;
670 }
671 trip--;
672 }
673
674 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
675 tz->trips.active[i].flags.valid; i++) {
676 if (!trip) {
677 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
678 tz->trips.active[i].temperature,
679 tz->kelvin_offset);
680 return 0;
681 }
682 trip--;
683 }
684
685 return -EINVAL;
686}
687
688static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
689 int *temperature)
690{
691 struct acpi_thermal *tz = thermal->devdata;
692
693 if (tz->trips.critical.flags.valid) {
694 *temperature = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
695 tz->trips.critical.temperature,
696 tz->kelvin_offset);
697 return 0;
698 } else
699 return -EINVAL;
700}
701
702static int thermal_get_trend(struct thermal_zone_device *thermal,
703 int trip, enum thermal_trend *trend)
704{
705 struct acpi_thermal *tz = thermal->devdata;
706 enum thermal_trip_type type;
707 int i;
708
709 if (thermal_get_trip_type(thermal, trip, &type))
710 return -EINVAL;
711
712 if (type == THERMAL_TRIP_ACTIVE) {
713 int trip_temp;
714 int temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
715 tz->temperature, tz->kelvin_offset);
716 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
717 return -EINVAL;
718
719 if (temp > trip_temp) {
720 *trend = THERMAL_TREND_RAISING;
721 return 0;
722 } else {
723 /* Fall back on default trend */
724 return -EINVAL;
725 }
726 }
727
728 /*
729 * tz->temperature has already been updated by generic thermal layer,
730 * before this callback being invoked
731 */
732 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
733 + (tz->trips.passive.tc2
734 * (tz->temperature - tz->trips.passive.temperature));
735
736 if (i > 0)
737 *trend = THERMAL_TREND_RAISING;
738 else if (i < 0)
739 *trend = THERMAL_TREND_DROPPING;
740 else
741 *trend = THERMAL_TREND_STABLE;
742 return 0;
743}
744
745
746static int thermal_notify(struct thermal_zone_device *thermal, int trip,
747 enum thermal_trip_type trip_type)
748{
749 u8 type = 0;
750 struct acpi_thermal *tz = thermal->devdata;
751
752 if (trip_type == THERMAL_TRIP_CRITICAL)
753 type = ACPI_THERMAL_NOTIFY_CRITICAL;
754 else if (trip_type == THERMAL_TRIP_HOT)
755 type = ACPI_THERMAL_NOTIFY_HOT;
756 else
757 return 0;
758
759 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
760 dev_name(&tz->device->dev), type, 1);
761
762 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
763 return 1;
764
765 return 0;
766}
767
768static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
769 struct thermal_cooling_device *cdev,
770 bool bind)
771{
772 struct acpi_device *device = cdev->devdata;
773 struct acpi_thermal *tz = thermal->devdata;
774 struct acpi_device *dev;
775 acpi_status status;
776 acpi_handle handle;
777 int i;
778 int j;
779 int trip = -1;
780 int result = 0;
781
782 if (tz->trips.critical.flags.valid)
783 trip++;
784
785 if (tz->trips.hot.flags.valid)
786 trip++;
787
788 if (tz->trips.passive.flags.valid) {
789 trip++;
790 for (i = 0; i < tz->trips.passive.devices.count;
791 i++) {
792 handle = tz->trips.passive.devices.handles[i];
793 status = acpi_bus_get_device(handle, &dev);
794 if (ACPI_FAILURE(status) || dev != device)
795 continue;
796 if (bind)
797 result =
798 thermal_zone_bind_cooling_device
799 (thermal, trip, cdev,
800 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
801 THERMAL_WEIGHT_DEFAULT);
802 else
803 result =
804 thermal_zone_unbind_cooling_device
805 (thermal, trip, cdev);
806 if (result)
807 goto failed;
808 }
809 }
810
811 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
812 if (!tz->trips.active[i].flags.valid)
813 break;
814 trip++;
815 for (j = 0;
816 j < tz->trips.active[i].devices.count;
817 j++) {
818 handle = tz->trips.active[i].devices.handles[j];
819 status = acpi_bus_get_device(handle, &dev);
820 if (ACPI_FAILURE(status) || dev != device)
821 continue;
822 if (bind)
823 result = thermal_zone_bind_cooling_device
824 (thermal, trip, cdev,
825 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
826 THERMAL_WEIGHT_DEFAULT);
827 else
828 result = thermal_zone_unbind_cooling_device
829 (thermal, trip, cdev);
830 if (result)
831 goto failed;
832 }
833 }
834
835 for (i = 0; i < tz->devices.count; i++) {
836 handle = tz->devices.handles[i];
837 status = acpi_bus_get_device(handle, &dev);
838 if (ACPI_SUCCESS(status) && (dev == device)) {
839 if (bind)
840 result = thermal_zone_bind_cooling_device
841 (thermal, THERMAL_TRIPS_NONE,
842 cdev, THERMAL_NO_LIMIT,
843 THERMAL_NO_LIMIT,
844 THERMAL_WEIGHT_DEFAULT);
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_bus_attach_private_data(tz->device->handle,
929 tz->thermal_zone);
930 if (ACPI_FAILURE(status))
931 return -ENODEV;
932
933 tz->tz_enabled = 1;
934
935 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
936 tz->thermal_zone->id);
937 return 0;
938}
939
940static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
941{
942 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
943 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
944 thermal_zone_device_unregister(tz->thermal_zone);
945 tz->thermal_zone = NULL;
946 acpi_bus_detach_private_data(tz->device->handle);
947}
948
949
950/* --------------------------------------------------------------------------
951 Driver Interface
952 -------------------------------------------------------------------------- */
953
954static void acpi_thermal_notify(struct acpi_device *device, u32 event)
955{
956 struct acpi_thermal *tz = acpi_driver_data(device);
957
958
959 if (!tz)
960 return;
961
962 switch (event) {
963 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
964 acpi_thermal_check(tz);
965 break;
966 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
967 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
968 acpi_thermal_check(tz);
969 acpi_bus_generate_netlink_event(device->pnp.device_class,
970 dev_name(&device->dev), event, 0);
971 break;
972 case ACPI_THERMAL_NOTIFY_DEVICES:
973 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
974 acpi_thermal_check(tz);
975 acpi_bus_generate_netlink_event(device->pnp.device_class,
976 dev_name(&device->dev), event, 0);
977 break;
978 default:
979 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
980 "Unsupported event [0x%x]\n", event));
981 break;
982 }
983}
984
985/*
986 * On some platforms, the AML code has dependency about
987 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
988 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
989 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
990 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
991 * if _TMP has never been evaluated.
992 *
993 * As this dependency is totally transparent to OS, evaluate
994 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
995 * _TMP, before they are actually used.
996 */
997static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
998{
999 acpi_handle handle = tz->device->handle;
1000 unsigned long long value;
1001 int i;
1002
1003 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
1004 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
1005 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
1006 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1007 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
1008 acpi_status status;
1009
1010 status = acpi_evaluate_integer(handle, name, NULL, &value);
1011 if (status == AE_NOT_FOUND)
1012 break;
1013 }
1014 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
1015}
1016
1017static int acpi_thermal_get_info(struct acpi_thermal *tz)
1018{
1019 int result = 0;
1020
1021
1022 if (!tz)
1023 return -EINVAL;
1024
1025 acpi_thermal_aml_dependency_fix(tz);
1026
1027 /* Get trip points [_CRT, _PSV, etc.] (required) */
1028 result = acpi_thermal_get_trip_points(tz);
1029 if (result)
1030 return result;
1031
1032 /* Get temperature [_TMP] (required) */
1033 result = acpi_thermal_get_temperature(tz);
1034 if (result)
1035 return result;
1036
1037 /* Set the cooling mode [_SCP] to active cooling (default) */
1038 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1039 if (!result)
1040 tz->flags.cooling_mode = 1;
1041
1042 /* Get default polling frequency [_TZP] (optional) */
1043 if (tzp)
1044 tz->polling_frequency = tzp;
1045 else
1046 acpi_thermal_get_polling_frequency(tz);
1047
1048 return 0;
1049}
1050
1051/*
1052 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1053 * handles temperature values with a single decimal place. As a consequence,
1054 * some implementations use an offset of 273.1 and others use an offset of
1055 * 273.2. Try to find out which one is being used, to present the most
1056 * accurate and visually appealing number.
1057 *
1058 * The heuristic below should work for all ACPI thermal zones which have a
1059 * critical trip point with a value being a multiple of 0.5 degree Celsius.
1060 */
1061static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1062{
1063 if (tz->trips.critical.flags.valid &&
1064 (tz->trips.critical.temperature % 5) == 1)
1065 tz->kelvin_offset = 2731;
1066 else
1067 tz->kelvin_offset = 2732;
1068}
1069
1070static void acpi_thermal_check_fn(struct work_struct *work)
1071{
1072 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1073 thermal_check_work);
1074 acpi_thermal_check(tz);
1075}
1076
1077static int acpi_thermal_add(struct acpi_device *device)
1078{
1079 int result = 0;
1080 struct acpi_thermal *tz = NULL;
1081
1082
1083 if (!device)
1084 return -EINVAL;
1085
1086 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1087 if (!tz)
1088 return -ENOMEM;
1089
1090 tz->device = device;
1091 strcpy(tz->name, device->pnp.bus_id);
1092 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1093 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1094 device->driver_data = tz;
1095
1096 result = acpi_thermal_get_info(tz);
1097 if (result)
1098 goto free_memory;
1099
1100 acpi_thermal_guess_offset(tz);
1101
1102 result = acpi_thermal_register_thermal_zone(tz);
1103 if (result)
1104 goto free_memory;
1105
1106 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1107
1108 pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
1109 acpi_device_bid(device), DECI_KELVIN_TO_CELSIUS(tz->temperature));
1110 goto end;
1111
1112free_memory:
1113 kfree(tz);
1114end:
1115 return result;
1116}
1117
1118static int acpi_thermal_remove(struct acpi_device *device)
1119{
1120 struct acpi_thermal *tz = NULL;
1121
1122 if (!device || !acpi_driver_data(device))
1123 return -EINVAL;
1124
1125 flush_workqueue(acpi_thermal_pm_queue);
1126 tz = acpi_driver_data(device);
1127
1128 acpi_thermal_unregister_thermal_zone(tz);
1129 kfree(tz);
1130 return 0;
1131}
1132
1133#ifdef CONFIG_PM_SLEEP
1134static int acpi_thermal_suspend(struct device *dev)
1135{
1136 /* Make sure the previously queued thermal check work has been done */
1137 flush_workqueue(acpi_thermal_pm_queue);
1138 return 0;
1139}
1140
1141static int acpi_thermal_resume(struct device *dev)
1142{
1143 struct acpi_thermal *tz;
1144 int i, j, power_state, result;
1145
1146 if (!dev)
1147 return -EINVAL;
1148
1149 tz = acpi_driver_data(to_acpi_device(dev));
1150 if (!tz)
1151 return -EINVAL;
1152
1153 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1154 if (!(&tz->trips.active[i]))
1155 break;
1156 if (!tz->trips.active[i].flags.valid)
1157 break;
1158 tz->trips.active[i].flags.enabled = 1;
1159 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1160 result = acpi_bus_update_power(
1161 tz->trips.active[i].devices.handles[j],
1162 &power_state);
1163 if (result || (power_state != ACPI_STATE_D0)) {
1164 tz->trips.active[i].flags.enabled = 0;
1165 break;
1166 }
1167 }
1168 tz->state.active |= tz->trips.active[i].flags.enabled;
1169 }
1170
1171 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
1172
1173 return AE_OK;
1174}
1175#endif
1176
1177static int thermal_act(const struct dmi_system_id *d) {
1178
1179 if (act == 0) {
1180 pr_notice(PREFIX "%s detected: "
1181 "disabling all active thermal trip points\n", d->ident);
1182 act = -1;
1183 }
1184 return 0;
1185}
1186static int thermal_nocrt(const struct dmi_system_id *d) {
1187
1188 pr_notice(PREFIX "%s detected: "
1189 "disabling all critical thermal trip point actions.\n", d->ident);
1190 nocrt = 1;
1191 return 0;
1192}
1193static int thermal_tzp(const struct dmi_system_id *d) {
1194
1195 if (tzp == 0) {
1196 pr_notice(PREFIX "%s detected: "
1197 "enabling thermal zone polling\n", d->ident);
1198 tzp = 300; /* 300 dS = 30 Seconds */
1199 }
1200 return 0;
1201}
1202static int thermal_psv(const struct dmi_system_id *d) {
1203
1204 if (psv == 0) {
1205 pr_notice(PREFIX "%s detected: "
1206 "disabling all passive thermal trip points\n", d->ident);
1207 psv = -1;
1208 }
1209 return 0;
1210}
1211
1212static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1213 /*
1214 * Award BIOS on this AOpen makes thermal control almost worthless.
1215 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1216 */
1217 {
1218 .callback = thermal_act,
1219 .ident = "AOpen i915GMm-HFS",
1220 .matches = {
1221 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1222 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1223 },
1224 },
1225 {
1226 .callback = thermal_psv,
1227 .ident = "AOpen i915GMm-HFS",
1228 .matches = {
1229 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1230 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1231 },
1232 },
1233 {
1234 .callback = thermal_tzp,
1235 .ident = "AOpen i915GMm-HFS",
1236 .matches = {
1237 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1238 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1239 },
1240 },
1241 {
1242 .callback = thermal_nocrt,
1243 .ident = "Gigabyte GA-7ZX",
1244 .matches = {
1245 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1246 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1247 },
1248 },
1249 {}
1250};
1251
1252static int __init acpi_thermal_init(void)
1253{
1254 int result = 0;
1255
1256 dmi_check_system(thermal_dmi_table);
1257
1258 if (off) {
1259 pr_notice(PREFIX "thermal control disabled\n");
1260 return -ENODEV;
1261 }
1262
1263 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1264 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1265 if (!acpi_thermal_pm_queue)
1266 return -ENODEV;
1267
1268 result = acpi_bus_register_driver(&acpi_thermal_driver);
1269 if (result < 0) {
1270 destroy_workqueue(acpi_thermal_pm_queue);
1271 return -ENODEV;
1272 }
1273
1274 return 0;
1275}
1276
1277static void __exit acpi_thermal_exit(void)
1278{
1279 acpi_bus_unregister_driver(&acpi_thermal_driver);
1280 destroy_workqueue(acpi_thermal_pm_queue);
1281
1282 return;
1283}
1284
1285module_init(acpi_thermal_init);
1286module_exit(acpi_thermal_exit);
1287