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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#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/dmi.h>
19#include <linux/init.h>
20#include <linux/slab.h>
21#include <linux/types.h>
22#include <linux/jiffies.h>
23#include <linux/kmod.h>
24#include <linux/reboot.h>
25#include <linux/device.h>
26#include <linux/thermal.h>
27#include <linux/acpi.h>
28#include <linux/workqueue.h>
29#include <linux/uaccess.h>
30#include <linux/units.h>
31
32#define PREFIX "ACPI: "
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
46#define _COMPONENT ACPI_THERMAL_COMPONENT
47ACPI_MODULE_NAME("thermal");
48
49MODULE_AUTHOR("Paul Diefenbaugh");
50MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
51MODULE_LICENSE("GPL");
52
53static int act;
54module_param(act, int, 0644);
55MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
56
57static int crt;
58module_param(crt, int, 0644);
59MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
60
61static int tzp;
62module_param(tzp, int, 0444);
63MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
64
65static int nocrt;
66module_param(nocrt, int, 0);
67MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
68
69static int off;
70module_param(off, int, 0);
71MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
72
73static int psv;
74module_param(psv, int, 0644);
75MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
76
77static struct workqueue_struct *acpi_thermal_pm_queue;
78
79static int acpi_thermal_add(struct acpi_device *device);
80static int acpi_thermal_remove(struct acpi_device *device);
81static void acpi_thermal_notify(struct acpi_device *device, u32 event);
82
83static const struct acpi_device_id thermal_device_ids[] = {
84 {ACPI_THERMAL_HID, 0},
85 {"", 0},
86};
87MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
88
89#ifdef CONFIG_PM_SLEEP
90static int acpi_thermal_suspend(struct device *dev);
91static int acpi_thermal_resume(struct device *dev);
92#else
93#define acpi_thermal_suspend NULL
94#define acpi_thermal_resume NULL
95#endif
96static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
97
98static struct acpi_driver acpi_thermal_driver = {
99 .name = "thermal",
100 .class = ACPI_THERMAL_CLASS,
101 .ids = thermal_device_ids,
102 .ops = {
103 .add = acpi_thermal_add,
104 .remove = acpi_thermal_remove,
105 .notify = acpi_thermal_notify,
106 },
107 .drv.pm = &acpi_thermal_pm,
108};
109
110struct acpi_thermal_state {
111 u8 critical:1;
112 u8 hot:1;
113 u8 passive:1;
114 u8 active:1;
115 u8 reserved:4;
116 int active_index;
117};
118
119struct acpi_thermal_state_flags {
120 u8 valid:1;
121 u8 enabled:1;
122 u8 reserved:6;
123};
124
125struct acpi_thermal_critical {
126 struct acpi_thermal_state_flags flags;
127 unsigned long temperature;
128};
129
130struct acpi_thermal_hot {
131 struct acpi_thermal_state_flags flags;
132 unsigned long temperature;
133};
134
135struct acpi_thermal_passive {
136 struct acpi_thermal_state_flags flags;
137 unsigned long temperature;
138 unsigned long tc1;
139 unsigned long tc2;
140 unsigned long tsp;
141 struct acpi_handle_list devices;
142};
143
144struct acpi_thermal_active {
145 struct acpi_thermal_state_flags flags;
146 unsigned long temperature;
147 struct acpi_handle_list devices;
148};
149
150struct acpi_thermal_trips {
151 struct acpi_thermal_critical critical;
152 struct acpi_thermal_hot hot;
153 struct acpi_thermal_passive passive;
154 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
155};
156
157struct acpi_thermal_flags {
158 u8 cooling_mode:1; /* _SCP */
159 u8 devices:1; /* _TZD */
160 u8 reserved:6;
161};
162
163struct acpi_thermal {
164 struct acpi_device * device;
165 acpi_bus_id name;
166 unsigned long temperature;
167 unsigned long last_temperature;
168 unsigned long polling_frequency;
169 volatile u8 zombie;
170 struct acpi_thermal_flags flags;
171 struct acpi_thermal_state state;
172 struct acpi_thermal_trips trips;
173 struct acpi_handle_list devices;
174 struct thermal_zone_device *thermal_zone;
175 int kelvin_offset; /* in millidegrees */
176 struct work_struct thermal_check_work;
177};
178
179/* --------------------------------------------------------------------------
180 Thermal Zone Management
181 -------------------------------------------------------------------------- */
182
183static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
184{
185 acpi_status status = AE_OK;
186 unsigned long long tmp;
187
188 if (!tz)
189 return -EINVAL;
190
191 tz->last_temperature = tz->temperature;
192
193 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
194 if (ACPI_FAILURE(status))
195 return -ENODEV;
196
197 tz->temperature = tmp;
198 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "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_DEBUG_PRINT((ACPI_DB_INFO, "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, str) \
256do { \
257 if (flags != ACPI_TRIPS_INIT) \
258 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
259 "ACPI thermal trip point %s changed\n" \
260 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
261} while (0)
262
263static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
264{
265 acpi_status status = AE_OK;
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,
274 "_CRT", NULL, &tmp);
275 tz->trips.critical.temperature = tmp;
276 /*
277 * Treat freezing temperatures as invalid as well; some
278 * BIOSes return really low values and cause reboots at startup.
279 * Below zero (Celsius) values clearly aren't right for sure..
280 * ... so lets discard those as invalid.
281 */
282 if (ACPI_FAILURE(status)) {
283 tz->trips.critical.flags.valid = 0;
284 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
285 "No critical threshold\n"));
286 } else if (tmp <= 2732) {
287 pr_warn(FW_BUG "Invalid critical threshold (%llu)\n",
288 tmp);
289 tz->trips.critical.flags.valid = 0;
290 } else {
291 tz->trips.critical.flags.valid = 1;
292 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
293 "Found critical threshold [%lu]\n",
294 tz->trips.critical.temperature));
295 }
296 if (tz->trips.critical.flags.valid == 1) {
297 if (crt == -1) {
298 tz->trips.critical.flags.valid = 0;
299 } else if (crt > 0) {
300 unsigned long crt_k = celsius_to_deci_kelvin(crt);
301
302 /*
303 * Allow override critical threshold
304 */
305 if (crt_k > tz->trips.critical.temperature)
306 pr_warn(PREFIX "Critical threshold %d C\n",
307 crt);
308 tz->trips.critical.temperature = crt_k;
309 }
310 }
311 }
312
313 /* Critical Sleep (optional) */
314 if (flag & ACPI_TRIPS_HOT) {
315 status = acpi_evaluate_integer(tz->device->handle,
316 "_HOT", NULL, &tmp);
317 if (ACPI_FAILURE(status)) {
318 tz->trips.hot.flags.valid = 0;
319 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
320 "No hot threshold\n"));
321 } else {
322 tz->trips.hot.temperature = tmp;
323 tz->trips.hot.flags.valid = 1;
324 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
325 "Found hot threshold [%lu]\n",
326 tz->trips.hot.temperature));
327 }
328 }
329
330 /* Passive (optional) */
331 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
332 (flag == ACPI_TRIPS_INIT)) {
333 valid = tz->trips.passive.flags.valid;
334 if (psv == -1) {
335 status = AE_SUPPORT;
336 } else if (psv > 0) {
337 tmp = celsius_to_deci_kelvin(psv);
338 status = AE_OK;
339 } else {
340 status = acpi_evaluate_integer(tz->device->handle,
341 "_PSV", NULL, &tmp);
342 }
343
344 if (ACPI_FAILURE(status))
345 tz->trips.passive.flags.valid = 0;
346 else {
347 tz->trips.passive.temperature = tmp;
348 tz->trips.passive.flags.valid = 1;
349 if (flag == ACPI_TRIPS_INIT) {
350 status = acpi_evaluate_integer(
351 tz->device->handle, "_TC1",
352 NULL, &tmp);
353 if (ACPI_FAILURE(status))
354 tz->trips.passive.flags.valid = 0;
355 else
356 tz->trips.passive.tc1 = tmp;
357 status = acpi_evaluate_integer(
358 tz->device->handle, "_TC2",
359 NULL, &tmp);
360 if (ACPI_FAILURE(status))
361 tz->trips.passive.flags.valid = 0;
362 else
363 tz->trips.passive.tc2 = tmp;
364 status = acpi_evaluate_integer(
365 tz->device->handle, "_TSP",
366 NULL, &tmp);
367 if (ACPI_FAILURE(status))
368 tz->trips.passive.flags.valid = 0;
369 else
370 tz->trips.passive.tsp = tmp;
371 }
372 }
373 }
374 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
375 memset(&devices, 0, sizeof(struct acpi_handle_list));
376 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
377 NULL, &devices);
378 if (ACPI_FAILURE(status)) {
379 pr_warn(PREFIX "Invalid passive threshold\n");
380 tz->trips.passive.flags.valid = 0;
381 }
382 else
383 tz->trips.passive.flags.valid = 1;
384
385 if (memcmp(&tz->trips.passive.devices, &devices,
386 sizeof(struct acpi_handle_list))) {
387 memcpy(&tz->trips.passive.devices, &devices,
388 sizeof(struct acpi_handle_list));
389 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
390 }
391 }
392 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
393 if (valid != tz->trips.passive.flags.valid)
394 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
395 }
396
397 /* Active (optional) */
398 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
399 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
400 valid = tz->trips.active[i].flags.valid;
401
402 if (act == -1)
403 break; /* disable all active trip points */
404
405 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
406 tz->trips.active[i].flags.valid)) {
407 status = acpi_evaluate_integer(tz->device->handle,
408 name, NULL, &tmp);
409 if (ACPI_FAILURE(status)) {
410 tz->trips.active[i].flags.valid = 0;
411 if (i == 0)
412 break;
413 if (act <= 0)
414 break;
415 if (i == 1)
416 tz->trips.active[0].temperature =
417 celsius_to_deci_kelvin(act);
418 else
419 /*
420 * Don't allow override higher than
421 * the next higher trip point
422 */
423 tz->trips.active[i - 1].temperature =
424 (tz->trips.active[i - 2].temperature <
425 celsius_to_deci_kelvin(act) ?
426 tz->trips.active[i - 2].temperature :
427 celsius_to_deci_kelvin(act));
428 break;
429 } else {
430 tz->trips.active[i].temperature = tmp;
431 tz->trips.active[i].flags.valid = 1;
432 }
433 }
434
435 name[2] = 'L';
436 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
437 memset(&devices, 0, sizeof(struct acpi_handle_list));
438 status = acpi_evaluate_reference(tz->device->handle,
439 name, NULL, &devices);
440 if (ACPI_FAILURE(status)) {
441 pr_warn(PREFIX "Invalid active%d threshold\n",
442 i);
443 tz->trips.active[i].flags.valid = 0;
444 }
445 else
446 tz->trips.active[i].flags.valid = 1;
447
448 if (memcmp(&tz->trips.active[i].devices, &devices,
449 sizeof(struct acpi_handle_list))) {
450 memcpy(&tz->trips.active[i].devices, &devices,
451 sizeof(struct acpi_handle_list));
452 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
453 }
454 }
455 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
456 if (valid != tz->trips.active[i].flags.valid)
457 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
458
459 if (!tz->trips.active[i].flags.valid)
460 break;
461 }
462
463 if (flag & ACPI_TRIPS_DEVICES) {
464 memset(&devices, 0, sizeof(devices));
465 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
466 NULL, &devices);
467 if (ACPI_SUCCESS(status)
468 && memcmp(&tz->devices, &devices, sizeof(devices))) {
469 tz->devices = devices;
470 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
471 }
472 }
473
474 return 0;
475}
476
477static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
478{
479 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
480
481 if (ret)
482 return ret;
483
484 valid = tz->trips.critical.flags.valid |
485 tz->trips.hot.flags.valid |
486 tz->trips.passive.flags.valid;
487
488 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
489 valid |= tz->trips.active[i].flags.valid;
490
491 if (!valid) {
492 pr_warn(FW_BUG "No valid trip found\n");
493 return -ENODEV;
494 }
495 return 0;
496}
497
498static void acpi_thermal_check(void *data)
499{
500 struct acpi_thermal *tz = data;
501
502 thermal_zone_device_update(tz->thermal_zone,
503 THERMAL_EVENT_UNSPECIFIED);
504}
505
506/* sys I/F for generic thermal sysfs support */
507
508static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
509{
510 struct acpi_thermal *tz = thermal->devdata;
511 int result;
512
513 if (!tz)
514 return -EINVAL;
515
516 result = acpi_thermal_get_temperature(tz);
517 if (result)
518 return result;
519
520 *temp = deci_kelvin_to_millicelsius_with_offset(tz->temperature,
521 tz->kelvin_offset);
522 return 0;
523}
524
525static int thermal_get_trip_type(struct thermal_zone_device *thermal,
526 int trip, enum thermal_trip_type *type)
527{
528 struct acpi_thermal *tz = thermal->devdata;
529 int i;
530
531 if (!tz || trip < 0)
532 return -EINVAL;
533
534 if (tz->trips.critical.flags.valid) {
535 if (!trip) {
536 *type = THERMAL_TRIP_CRITICAL;
537 return 0;
538 }
539 trip--;
540 }
541
542 if (tz->trips.hot.flags.valid) {
543 if (!trip) {
544 *type = THERMAL_TRIP_HOT;
545 return 0;
546 }
547 trip--;
548 }
549
550 if (tz->trips.passive.flags.valid) {
551 if (!trip) {
552 *type = THERMAL_TRIP_PASSIVE;
553 return 0;
554 }
555 trip--;
556 }
557
558 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
559 tz->trips.active[i].flags.valid; i++) {
560 if (!trip) {
561 *type = THERMAL_TRIP_ACTIVE;
562 return 0;
563 }
564 trip--;
565 }
566
567 return -EINVAL;
568}
569
570static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
571 int trip, int *temp)
572{
573 struct acpi_thermal *tz = thermal->devdata;
574 int i;
575
576 if (!tz || trip < 0)
577 return -EINVAL;
578
579 if (tz->trips.critical.flags.valid) {
580 if (!trip) {
581 *temp = deci_kelvin_to_millicelsius_with_offset(
582 tz->trips.critical.temperature,
583 tz->kelvin_offset);
584 return 0;
585 }
586 trip--;
587 }
588
589 if (tz->trips.hot.flags.valid) {
590 if (!trip) {
591 *temp = deci_kelvin_to_millicelsius_with_offset(
592 tz->trips.hot.temperature,
593 tz->kelvin_offset);
594 return 0;
595 }
596 trip--;
597 }
598
599 if (tz->trips.passive.flags.valid) {
600 if (!trip) {
601 *temp = deci_kelvin_to_millicelsius_with_offset(
602 tz->trips.passive.temperature,
603 tz->kelvin_offset);
604 return 0;
605 }
606 trip--;
607 }
608
609 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
610 tz->trips.active[i].flags.valid; i++) {
611 if (!trip) {
612 *temp = deci_kelvin_to_millicelsius_with_offset(
613 tz->trips.active[i].temperature,
614 tz->kelvin_offset);
615 return 0;
616 }
617 trip--;
618 }
619
620 return -EINVAL;
621}
622
623static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
624 int *temperature)
625{
626 struct acpi_thermal *tz = thermal->devdata;
627
628 if (tz->trips.critical.flags.valid) {
629 *temperature = deci_kelvin_to_millicelsius_with_offset(
630 tz->trips.critical.temperature,
631 tz->kelvin_offset);
632 return 0;
633 } else
634 return -EINVAL;
635}
636
637static int thermal_get_trend(struct thermal_zone_device *thermal,
638 int trip, enum thermal_trend *trend)
639{
640 struct acpi_thermal *tz = thermal->devdata;
641 enum thermal_trip_type type;
642 int i;
643
644 if (thermal_get_trip_type(thermal, trip, &type))
645 return -EINVAL;
646
647 if (type == THERMAL_TRIP_ACTIVE) {
648 int trip_temp;
649 int temp = deci_kelvin_to_millicelsius_with_offset(
650 tz->temperature, tz->kelvin_offset);
651 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
652 return -EINVAL;
653
654 if (temp > trip_temp) {
655 *trend = THERMAL_TREND_RAISING;
656 return 0;
657 } else {
658 /* Fall back on default trend */
659 return -EINVAL;
660 }
661 }
662
663 /*
664 * tz->temperature has already been updated by generic thermal layer,
665 * before this callback being invoked
666 */
667 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
668 + (tz->trips.passive.tc2
669 * (tz->temperature - tz->trips.passive.temperature));
670
671 if (i > 0)
672 *trend = THERMAL_TREND_RAISING;
673 else if (i < 0)
674 *trend = THERMAL_TREND_DROPPING;
675 else
676 *trend = THERMAL_TREND_STABLE;
677 return 0;
678}
679
680
681static int thermal_notify(struct thermal_zone_device *thermal, int trip,
682 enum thermal_trip_type trip_type)
683{
684 u8 type = 0;
685 struct acpi_thermal *tz = thermal->devdata;
686
687 if (trip_type == THERMAL_TRIP_CRITICAL)
688 type = ACPI_THERMAL_NOTIFY_CRITICAL;
689 else if (trip_type == THERMAL_TRIP_HOT)
690 type = ACPI_THERMAL_NOTIFY_HOT;
691 else
692 return 0;
693
694 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
695 dev_name(&tz->device->dev), type, 1);
696
697 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
698 return 1;
699
700 return 0;
701}
702
703static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
704 struct thermal_cooling_device *cdev,
705 bool bind)
706{
707 struct acpi_device *device = cdev->devdata;
708 struct acpi_thermal *tz = thermal->devdata;
709 struct acpi_device *dev;
710 acpi_status status;
711 acpi_handle handle;
712 int i;
713 int j;
714 int trip = -1;
715 int result = 0;
716
717 if (tz->trips.critical.flags.valid)
718 trip++;
719
720 if (tz->trips.hot.flags.valid)
721 trip++;
722
723 if (tz->trips.passive.flags.valid) {
724 trip++;
725 for (i = 0; i < tz->trips.passive.devices.count;
726 i++) {
727 handle = tz->trips.passive.devices.handles[i];
728 status = acpi_bus_get_device(handle, &dev);
729 if (ACPI_FAILURE(status) || dev != device)
730 continue;
731 if (bind)
732 result =
733 thermal_zone_bind_cooling_device
734 (thermal, trip, cdev,
735 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
736 THERMAL_WEIGHT_DEFAULT);
737 else
738 result =
739 thermal_zone_unbind_cooling_device
740 (thermal, trip, cdev);
741 if (result)
742 goto failed;
743 }
744 }
745
746 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
747 if (!tz->trips.active[i].flags.valid)
748 break;
749 trip++;
750 for (j = 0;
751 j < tz->trips.active[i].devices.count;
752 j++) {
753 handle = tz->trips.active[i].devices.handles[j];
754 status = acpi_bus_get_device(handle, &dev);
755 if (ACPI_FAILURE(status) || dev != device)
756 continue;
757 if (bind)
758 result = thermal_zone_bind_cooling_device
759 (thermal, trip, cdev,
760 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
761 THERMAL_WEIGHT_DEFAULT);
762 else
763 result = thermal_zone_unbind_cooling_device
764 (thermal, trip, cdev);
765 if (result)
766 goto failed;
767 }
768 }
769
770 for (i = 0; i < tz->devices.count; i++) {
771 handle = tz->devices.handles[i];
772 status = acpi_bus_get_device(handle, &dev);
773 if (ACPI_SUCCESS(status) && (dev == device)) {
774 if (bind)
775 result = thermal_zone_bind_cooling_device
776 (thermal, THERMAL_TRIPS_NONE,
777 cdev, THERMAL_NO_LIMIT,
778 THERMAL_NO_LIMIT,
779 THERMAL_WEIGHT_DEFAULT);
780 else
781 result = thermal_zone_unbind_cooling_device
782 (thermal, THERMAL_TRIPS_NONE,
783 cdev);
784 if (result)
785 goto failed;
786 }
787 }
788
789failed:
790 return result;
791}
792
793static int
794acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
795 struct thermal_cooling_device *cdev)
796{
797 return acpi_thermal_cooling_device_cb(thermal, cdev, true);
798}
799
800static int
801acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
802 struct thermal_cooling_device *cdev)
803{
804 return acpi_thermal_cooling_device_cb(thermal, cdev, false);
805}
806
807static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
808 .bind = acpi_thermal_bind_cooling_device,
809 .unbind = acpi_thermal_unbind_cooling_device,
810 .get_temp = thermal_get_temp,
811 .get_trip_type = thermal_get_trip_type,
812 .get_trip_temp = thermal_get_trip_temp,
813 .get_crit_temp = thermal_get_crit_temp,
814 .get_trend = thermal_get_trend,
815 .notify = thermal_notify,
816};
817
818static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
819{
820 int trips = 0;
821 int result;
822 acpi_status status;
823 int i;
824
825 if (tz->trips.critical.flags.valid)
826 trips++;
827
828 if (tz->trips.hot.flags.valid)
829 trips++;
830
831 if (tz->trips.passive.flags.valid)
832 trips++;
833
834 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
835 tz->trips.active[i].flags.valid; i++, trips++);
836
837 if (tz->trips.passive.flags.valid)
838 tz->thermal_zone =
839 thermal_zone_device_register("acpitz", trips, 0, tz,
840 &acpi_thermal_zone_ops, NULL,
841 tz->trips.passive.tsp*100,
842 tz->polling_frequency*100);
843 else
844 tz->thermal_zone =
845 thermal_zone_device_register("acpitz", trips, 0, tz,
846 &acpi_thermal_zone_ops, NULL,
847 0, tz->polling_frequency*100);
848 if (IS_ERR(tz->thermal_zone))
849 return -ENODEV;
850
851 result = sysfs_create_link(&tz->device->dev.kobj,
852 &tz->thermal_zone->device.kobj, "thermal_zone");
853 if (result)
854 goto unregister_tzd;
855
856 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
857 &tz->device->dev.kobj, "device");
858 if (result)
859 goto remove_tz_link;
860
861 status = acpi_bus_attach_private_data(tz->device->handle,
862 tz->thermal_zone);
863 if (ACPI_FAILURE(status)) {
864 result = -ENODEV;
865 goto remove_dev_link;
866 }
867
868 result = thermal_zone_device_enable(tz->thermal_zone);
869 if (result)
870 goto acpi_bus_detach;
871
872 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
873 tz->thermal_zone->id);
874
875 return 0;
876
877acpi_bus_detach:
878 acpi_bus_detach_private_data(tz->device->handle);
879remove_dev_link:
880 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
881remove_tz_link:
882 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
883unregister_tzd:
884 thermal_zone_device_unregister(tz->thermal_zone);
885
886 return result;
887}
888
889static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
890{
891 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
892 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
893 thermal_zone_device_unregister(tz->thermal_zone);
894 tz->thermal_zone = NULL;
895 acpi_bus_detach_private_data(tz->device->handle);
896}
897
898
899/* --------------------------------------------------------------------------
900 Driver Interface
901 -------------------------------------------------------------------------- */
902
903static void acpi_thermal_notify(struct acpi_device *device, u32 event)
904{
905 struct acpi_thermal *tz = acpi_driver_data(device);
906
907
908 if (!tz)
909 return;
910
911 switch (event) {
912 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
913 acpi_thermal_check(tz);
914 break;
915 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
916 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
917 acpi_thermal_check(tz);
918 acpi_bus_generate_netlink_event(device->pnp.device_class,
919 dev_name(&device->dev), event, 0);
920 break;
921 case ACPI_THERMAL_NOTIFY_DEVICES:
922 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
923 acpi_thermal_check(tz);
924 acpi_bus_generate_netlink_event(device->pnp.device_class,
925 dev_name(&device->dev), event, 0);
926 break;
927 default:
928 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
929 "Unsupported event [0x%x]\n", event));
930 break;
931 }
932}
933
934/*
935 * On some platforms, the AML code has dependency about
936 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
937 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
938 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
939 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
940 * if _TMP has never been evaluated.
941 *
942 * As this dependency is totally transparent to OS, evaluate
943 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
944 * _TMP, before they are actually used.
945 */
946static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
947{
948 acpi_handle handle = tz->device->handle;
949 unsigned long long value;
950 int i;
951
952 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
953 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
954 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
955 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
956 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
957 acpi_status status;
958
959 status = acpi_evaluate_integer(handle, name, NULL, &value);
960 if (status == AE_NOT_FOUND)
961 break;
962 }
963 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
964}
965
966static int acpi_thermal_get_info(struct acpi_thermal *tz)
967{
968 int result = 0;
969
970
971 if (!tz)
972 return -EINVAL;
973
974 acpi_thermal_aml_dependency_fix(tz);
975
976 /* Get trip points [_CRT, _PSV, etc.] (required) */
977 result = acpi_thermal_get_trip_points(tz);
978 if (result)
979 return result;
980
981 /* Get temperature [_TMP] (required) */
982 result = acpi_thermal_get_temperature(tz);
983 if (result)
984 return result;
985
986 /* Set the cooling mode [_SCP] to active cooling (default) */
987 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
988 if (!result)
989 tz->flags.cooling_mode = 1;
990
991 /* Get default polling frequency [_TZP] (optional) */
992 if (tzp)
993 tz->polling_frequency = tzp;
994 else
995 acpi_thermal_get_polling_frequency(tz);
996
997 return 0;
998}
999
1000/*
1001 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1002 * handles temperature values with a single decimal place. As a consequence,
1003 * some implementations use an offset of 273.1 and others use an offset of
1004 * 273.2. Try to find out which one is being used, to present the most
1005 * accurate and visually appealing number.
1006 *
1007 * The heuristic below should work for all ACPI thermal zones which have a
1008 * critical trip point with a value being a multiple of 0.5 degree Celsius.
1009 */
1010static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1011{
1012 if (tz->trips.critical.flags.valid &&
1013 (tz->trips.critical.temperature % 5) == 1)
1014 tz->kelvin_offset = 273100;
1015 else
1016 tz->kelvin_offset = 273200;
1017}
1018
1019static void acpi_thermal_check_fn(struct work_struct *work)
1020{
1021 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1022 thermal_check_work);
1023 acpi_thermal_check(tz);
1024}
1025
1026static int acpi_thermal_add(struct acpi_device *device)
1027{
1028 int result = 0;
1029 struct acpi_thermal *tz = NULL;
1030
1031
1032 if (!device)
1033 return -EINVAL;
1034
1035 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1036 if (!tz)
1037 return -ENOMEM;
1038
1039 tz->device = device;
1040 strcpy(tz->name, device->pnp.bus_id);
1041 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1042 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1043 device->driver_data = tz;
1044
1045 result = acpi_thermal_get_info(tz);
1046 if (result)
1047 goto free_memory;
1048
1049 acpi_thermal_guess_offset(tz);
1050
1051 result = acpi_thermal_register_thermal_zone(tz);
1052 if (result)
1053 goto free_memory;
1054
1055 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1056
1057 pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
1058 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temperature));
1059 goto end;
1060
1061free_memory:
1062 kfree(tz);
1063end:
1064 return result;
1065}
1066
1067static int acpi_thermal_remove(struct acpi_device *device)
1068{
1069 struct acpi_thermal *tz = NULL;
1070
1071 if (!device || !acpi_driver_data(device))
1072 return -EINVAL;
1073
1074 flush_workqueue(acpi_thermal_pm_queue);
1075 tz = acpi_driver_data(device);
1076
1077 acpi_thermal_unregister_thermal_zone(tz);
1078 kfree(tz);
1079 return 0;
1080}
1081
1082#ifdef CONFIG_PM_SLEEP
1083static int acpi_thermal_suspend(struct device *dev)
1084{
1085 /* Make sure the previously queued thermal check work has been done */
1086 flush_workqueue(acpi_thermal_pm_queue);
1087 return 0;
1088}
1089
1090static int acpi_thermal_resume(struct device *dev)
1091{
1092 struct acpi_thermal *tz;
1093 int i, j, power_state, result;
1094
1095 if (!dev)
1096 return -EINVAL;
1097
1098 tz = acpi_driver_data(to_acpi_device(dev));
1099 if (!tz)
1100 return -EINVAL;
1101
1102 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1103 if (!(&tz->trips.active[i]))
1104 break;
1105 if (!tz->trips.active[i].flags.valid)
1106 break;
1107 tz->trips.active[i].flags.enabled = 1;
1108 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1109 result = acpi_bus_update_power(
1110 tz->trips.active[i].devices.handles[j],
1111 &power_state);
1112 if (result || (power_state != ACPI_STATE_D0)) {
1113 tz->trips.active[i].flags.enabled = 0;
1114 break;
1115 }
1116 }
1117 tz->state.active |= tz->trips.active[i].flags.enabled;
1118 }
1119
1120 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
1121
1122 return AE_OK;
1123}
1124#endif
1125
1126static int thermal_act(const struct dmi_system_id *d) {
1127
1128 if (act == 0) {
1129 pr_notice(PREFIX "%s detected: "
1130 "disabling all active thermal trip points\n", d->ident);
1131 act = -1;
1132 }
1133 return 0;
1134}
1135static int thermal_nocrt(const struct dmi_system_id *d) {
1136
1137 pr_notice(PREFIX "%s detected: "
1138 "disabling all critical thermal trip point actions.\n", d->ident);
1139 nocrt = 1;
1140 return 0;
1141}
1142static int thermal_tzp(const struct dmi_system_id *d) {
1143
1144 if (tzp == 0) {
1145 pr_notice(PREFIX "%s detected: "
1146 "enabling thermal zone polling\n", d->ident);
1147 tzp = 300; /* 300 dS = 30 Seconds */
1148 }
1149 return 0;
1150}
1151static int thermal_psv(const struct dmi_system_id *d) {
1152
1153 if (psv == 0) {
1154 pr_notice(PREFIX "%s detected: "
1155 "disabling all passive thermal trip points\n", d->ident);
1156 psv = -1;
1157 }
1158 return 0;
1159}
1160
1161static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1162 /*
1163 * Award BIOS on this AOpen makes thermal control almost worthless.
1164 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1165 */
1166 {
1167 .callback = thermal_act,
1168 .ident = "AOpen i915GMm-HFS",
1169 .matches = {
1170 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1171 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1172 },
1173 },
1174 {
1175 .callback = thermal_psv,
1176 .ident = "AOpen i915GMm-HFS",
1177 .matches = {
1178 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1179 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1180 },
1181 },
1182 {
1183 .callback = thermal_tzp,
1184 .ident = "AOpen i915GMm-HFS",
1185 .matches = {
1186 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1187 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1188 },
1189 },
1190 {
1191 .callback = thermal_nocrt,
1192 .ident = "Gigabyte GA-7ZX",
1193 .matches = {
1194 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1195 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1196 },
1197 },
1198 {}
1199};
1200
1201static int __init acpi_thermal_init(void)
1202{
1203 int result = 0;
1204
1205 dmi_check_system(thermal_dmi_table);
1206
1207 if (off) {
1208 pr_notice(PREFIX "thermal control disabled\n");
1209 return -ENODEV;
1210 }
1211
1212 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1213 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1214 if (!acpi_thermal_pm_queue)
1215 return -ENODEV;
1216
1217 result = acpi_bus_register_driver(&acpi_thermal_driver);
1218 if (result < 0) {
1219 destroy_workqueue(acpi_thermal_pm_queue);
1220 return -ENODEV;
1221 }
1222
1223 return 0;
1224}
1225
1226static void __exit acpi_thermal_exit(void)
1227{
1228 acpi_bus_unregister_driver(&acpi_thermal_driver);
1229 destroy_workqueue(acpi_thermal_pm_queue);
1230
1231 return;
1232}
1233
1234module_init(acpi_thermal_init);
1235module_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#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/dmi.h>
19#include <linux/init.h>
20#include <linux/slab.h>
21#include <linux/types.h>
22#include <linux/jiffies.h>
23#include <linux/kmod.h>
24#include <linux/reboot.h>
25#include <linux/device.h>
26#include <linux/thermal.h>
27#include <linux/acpi.h>
28#include <linux/workqueue.h>
29#include <linux/uaccess.h>
30
31#define PREFIX "ACPI: "
32
33#define ACPI_THERMAL_CLASS "thermal_zone"
34#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
35#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
36#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
37#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
38#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
39#define ACPI_THERMAL_NOTIFY_HOT 0xF1
40#define ACPI_THERMAL_MODE_ACTIVE 0x00
41
42#define ACPI_THERMAL_MAX_ACTIVE 10
43#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
44
45#define _COMPONENT ACPI_THERMAL_COMPONENT
46ACPI_MODULE_NAME("thermal");
47
48MODULE_AUTHOR("Paul Diefenbaugh");
49MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
50MODULE_LICENSE("GPL");
51
52static int act;
53module_param(act, int, 0644);
54MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
55
56static int crt;
57module_param(crt, int, 0644);
58MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
59
60static int tzp;
61module_param(tzp, int, 0444);
62MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
63
64static int nocrt;
65module_param(nocrt, int, 0);
66MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
67
68static int off;
69module_param(off, int, 0);
70MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
71
72static int psv;
73module_param(psv, int, 0644);
74MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
75
76static struct workqueue_struct *acpi_thermal_pm_queue;
77
78static int acpi_thermal_add(struct acpi_device *device);
79static int acpi_thermal_remove(struct acpi_device *device);
80static void acpi_thermal_notify(struct acpi_device *device, u32 event);
81
82static const struct acpi_device_id thermal_device_ids[] = {
83 {ACPI_THERMAL_HID, 0},
84 {"", 0},
85};
86MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
87
88#ifdef CONFIG_PM_SLEEP
89static int acpi_thermal_suspend(struct device *dev);
90static int acpi_thermal_resume(struct device *dev);
91#else
92#define acpi_thermal_suspend NULL
93#define acpi_thermal_resume NULL
94#endif
95static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
96
97static struct acpi_driver acpi_thermal_driver = {
98 .name = "thermal",
99 .class = ACPI_THERMAL_CLASS,
100 .ids = thermal_device_ids,
101 .ops = {
102 .add = acpi_thermal_add,
103 .remove = acpi_thermal_remove,
104 .notify = acpi_thermal_notify,
105 },
106 .drv.pm = &acpi_thermal_pm,
107};
108
109struct acpi_thermal_state {
110 u8 critical:1;
111 u8 hot:1;
112 u8 passive:1;
113 u8 active:1;
114 u8 reserved:4;
115 int active_index;
116};
117
118struct acpi_thermal_state_flags {
119 u8 valid:1;
120 u8 enabled:1;
121 u8 reserved:6;
122};
123
124struct acpi_thermal_critical {
125 struct acpi_thermal_state_flags flags;
126 unsigned long temperature;
127};
128
129struct acpi_thermal_hot {
130 struct acpi_thermal_state_flags flags;
131 unsigned long temperature;
132};
133
134struct acpi_thermal_passive {
135 struct acpi_thermal_state_flags flags;
136 unsigned long temperature;
137 unsigned long tc1;
138 unsigned long tc2;
139 unsigned long tsp;
140 struct acpi_handle_list devices;
141};
142
143struct acpi_thermal_active {
144 struct acpi_thermal_state_flags flags;
145 unsigned long temperature;
146 struct acpi_handle_list devices;
147};
148
149struct acpi_thermal_trips {
150 struct acpi_thermal_critical critical;
151 struct acpi_thermal_hot hot;
152 struct acpi_thermal_passive passive;
153 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
154};
155
156struct acpi_thermal_flags {
157 u8 cooling_mode:1; /* _SCP */
158 u8 devices:1; /* _TZD */
159 u8 reserved:6;
160};
161
162struct acpi_thermal {
163 struct acpi_device * device;
164 acpi_bus_id name;
165 unsigned long temperature;
166 unsigned long last_temperature;
167 unsigned long polling_frequency;
168 volatile u8 zombie;
169 struct acpi_thermal_flags flags;
170 struct acpi_thermal_state state;
171 struct acpi_thermal_trips trips;
172 struct acpi_handle_list devices;
173 struct thermal_zone_device *thermal_zone;
174 int tz_enabled;
175 int kelvin_offset;
176 struct work_struct thermal_check_work;
177};
178
179/* --------------------------------------------------------------------------
180 Thermal Zone Management
181 -------------------------------------------------------------------------- */
182
183static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
184{
185 acpi_status status = AE_OK;
186 unsigned long long tmp;
187
188 if (!tz)
189 return -EINVAL;
190
191 tz->last_temperature = tz->temperature;
192
193 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
194 if (ACPI_FAILURE(status))
195 return -ENODEV;
196
197 tz->temperature = tmp;
198 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "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_DEBUG_PRINT((ACPI_DB_INFO, "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, str) \
256do { \
257 if (flags != ACPI_TRIPS_INIT) \
258 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
259 "ACPI thermal trip point %s changed\n" \
260 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
261} while (0)
262
263static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
264{
265 acpi_status status = AE_OK;
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,
274 "_CRT", NULL, &tmp);
275 tz->trips.critical.temperature = tmp;
276 /*
277 * Treat freezing temperatures as invalid as well; some
278 * BIOSes return really low values and cause reboots at startup.
279 * Below zero (Celsius) values clearly aren't right for sure..
280 * ... so lets discard those as invalid.
281 */
282 if (ACPI_FAILURE(status)) {
283 tz->trips.critical.flags.valid = 0;
284 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
285 "No critical threshold\n"));
286 } else if (tmp <= 2732) {
287 pr_warn(FW_BUG "Invalid critical threshold (%llu)\n",
288 tmp);
289 tz->trips.critical.flags.valid = 0;
290 } else {
291 tz->trips.critical.flags.valid = 1;
292 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
293 "Found critical threshold [%lu]\n",
294 tz->trips.critical.temperature));
295 }
296 if (tz->trips.critical.flags.valid == 1) {
297 if (crt == -1) {
298 tz->trips.critical.flags.valid = 0;
299 } else if (crt > 0) {
300 unsigned long crt_k = CELSIUS_TO_DECI_KELVIN(crt);
301 /*
302 * Allow override critical threshold
303 */
304 if (crt_k > tz->trips.critical.temperature)
305 pr_warn(PREFIX "Critical threshold %d C\n",
306 crt);
307 tz->trips.critical.temperature = crt_k;
308 }
309 }
310 }
311
312 /* Critical Sleep (optional) */
313 if (flag & ACPI_TRIPS_HOT) {
314 status = acpi_evaluate_integer(tz->device->handle,
315 "_HOT", NULL, &tmp);
316 if (ACPI_FAILURE(status)) {
317 tz->trips.hot.flags.valid = 0;
318 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
319 "No hot threshold\n"));
320 } else {
321 tz->trips.hot.temperature = tmp;
322 tz->trips.hot.flags.valid = 1;
323 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
324 "Found hot threshold [%lu]\n",
325 tz->trips.hot.temperature));
326 }
327 }
328
329 /* Passive (optional) */
330 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
331 (flag == ACPI_TRIPS_INIT)) {
332 valid = tz->trips.passive.flags.valid;
333 if (psv == -1) {
334 status = AE_SUPPORT;
335 } else if (psv > 0) {
336 tmp = CELSIUS_TO_DECI_KELVIN(psv);
337 status = AE_OK;
338 } else {
339 status = acpi_evaluate_integer(tz->device->handle,
340 "_PSV", NULL, &tmp);
341 }
342
343 if (ACPI_FAILURE(status))
344 tz->trips.passive.flags.valid = 0;
345 else {
346 tz->trips.passive.temperature = tmp;
347 tz->trips.passive.flags.valid = 1;
348 if (flag == ACPI_TRIPS_INIT) {
349 status = acpi_evaluate_integer(
350 tz->device->handle, "_TC1",
351 NULL, &tmp);
352 if (ACPI_FAILURE(status))
353 tz->trips.passive.flags.valid = 0;
354 else
355 tz->trips.passive.tc1 = tmp;
356 status = acpi_evaluate_integer(
357 tz->device->handle, "_TC2",
358 NULL, &tmp);
359 if (ACPI_FAILURE(status))
360 tz->trips.passive.flags.valid = 0;
361 else
362 tz->trips.passive.tc2 = tmp;
363 status = acpi_evaluate_integer(
364 tz->device->handle, "_TSP",
365 NULL, &tmp);
366 if (ACPI_FAILURE(status))
367 tz->trips.passive.flags.valid = 0;
368 else
369 tz->trips.passive.tsp = tmp;
370 }
371 }
372 }
373 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
374 memset(&devices, 0, sizeof(struct acpi_handle_list));
375 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
376 NULL, &devices);
377 if (ACPI_FAILURE(status)) {
378 pr_warn(PREFIX "Invalid passive threshold\n");
379 tz->trips.passive.flags.valid = 0;
380 }
381 else
382 tz->trips.passive.flags.valid = 1;
383
384 if (memcmp(&tz->trips.passive.devices, &devices,
385 sizeof(struct acpi_handle_list))) {
386 memcpy(&tz->trips.passive.devices, &devices,
387 sizeof(struct acpi_handle_list));
388 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
389 }
390 }
391 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
392 if (valid != tz->trips.passive.flags.valid)
393 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
394 }
395
396 /* Active (optional) */
397 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
398 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
399 valid = tz->trips.active[i].flags.valid;
400
401 if (act == -1)
402 break; /* disable all active trip points */
403
404 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
405 tz->trips.active[i].flags.valid)) {
406 status = acpi_evaluate_integer(tz->device->handle,
407 name, NULL, &tmp);
408 if (ACPI_FAILURE(status)) {
409 tz->trips.active[i].flags.valid = 0;
410 if (i == 0)
411 break;
412 if (act <= 0)
413 break;
414 if (i == 1)
415 tz->trips.active[0].temperature =
416 CELSIUS_TO_DECI_KELVIN(act);
417 else
418 /*
419 * Don't allow override higher than
420 * the next higher trip point
421 */
422 tz->trips.active[i - 1].temperature =
423 (tz->trips.active[i - 2].temperature <
424 CELSIUS_TO_DECI_KELVIN(act) ?
425 tz->trips.active[i - 2].temperature :
426 CELSIUS_TO_DECI_KELVIN(act));
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 pr_warn(PREFIX "Invalid active%d threshold\n",
441 i);
442 tz->trips.active[i].flags.valid = 0;
443 }
444 else
445 tz->trips.active[i].flags.valid = 1;
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, "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, "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, "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
497static void acpi_thermal_check(void *data)
498{
499 struct acpi_thermal *tz = data;
500
501 if (!tz->tz_enabled)
502 return;
503
504 thermal_zone_device_update(tz->thermal_zone,
505 THERMAL_EVENT_UNSPECIFIED);
506}
507
508/* sys I/F for generic thermal sysfs support */
509
510static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
511{
512 struct acpi_thermal *tz = thermal->devdata;
513 int result;
514
515 if (!tz)
516 return -EINVAL;
517
518 result = acpi_thermal_get_temperature(tz);
519 if (result)
520 return result;
521
522 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(tz->temperature,
523 tz->kelvin_offset);
524 return 0;
525}
526
527static int thermal_get_mode(struct thermal_zone_device *thermal,
528 enum thermal_device_mode *mode)
529{
530 struct acpi_thermal *tz = thermal->devdata;
531
532 if (!tz)
533 return -EINVAL;
534
535 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
536 THERMAL_DEVICE_DISABLED;
537
538 return 0;
539}
540
541static int thermal_set_mode(struct thermal_zone_device *thermal,
542 enum thermal_device_mode mode)
543{
544 struct acpi_thermal *tz = thermal->devdata;
545 int enable;
546
547 if (!tz)
548 return -EINVAL;
549
550 /*
551 * enable/disable thermal management from ACPI thermal driver
552 */
553 if (mode == THERMAL_DEVICE_ENABLED)
554 enable = 1;
555 else if (mode == THERMAL_DEVICE_DISABLED) {
556 enable = 0;
557 pr_warn("thermal zone will be disabled\n");
558 } else
559 return -EINVAL;
560
561 if (enable != tz->tz_enabled) {
562 tz->tz_enabled = enable;
563 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
564 "%s kernel ACPI thermal control\n",
565 tz->tz_enabled ? "Enable" : "Disable"));
566 acpi_thermal_check(tz);
567 }
568 return 0;
569}
570
571static int thermal_get_trip_type(struct thermal_zone_device *thermal,
572 int trip, enum thermal_trip_type *type)
573{
574 struct acpi_thermal *tz = thermal->devdata;
575 int i;
576
577 if (!tz || trip < 0)
578 return -EINVAL;
579
580 if (tz->trips.critical.flags.valid) {
581 if (!trip) {
582 *type = THERMAL_TRIP_CRITICAL;
583 return 0;
584 }
585 trip--;
586 }
587
588 if (tz->trips.hot.flags.valid) {
589 if (!trip) {
590 *type = THERMAL_TRIP_HOT;
591 return 0;
592 }
593 trip--;
594 }
595
596 if (tz->trips.passive.flags.valid) {
597 if (!trip) {
598 *type = THERMAL_TRIP_PASSIVE;
599 return 0;
600 }
601 trip--;
602 }
603
604 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
605 tz->trips.active[i].flags.valid; i++) {
606 if (!trip) {
607 *type = THERMAL_TRIP_ACTIVE;
608 return 0;
609 }
610 trip--;
611 }
612
613 return -EINVAL;
614}
615
616static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
617 int trip, int *temp)
618{
619 struct acpi_thermal *tz = thermal->devdata;
620 int i;
621
622 if (!tz || trip < 0)
623 return -EINVAL;
624
625 if (tz->trips.critical.flags.valid) {
626 if (!trip) {
627 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
628 tz->trips.critical.temperature,
629 tz->kelvin_offset);
630 return 0;
631 }
632 trip--;
633 }
634
635 if (tz->trips.hot.flags.valid) {
636 if (!trip) {
637 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
638 tz->trips.hot.temperature,
639 tz->kelvin_offset);
640 return 0;
641 }
642 trip--;
643 }
644
645 if (tz->trips.passive.flags.valid) {
646 if (!trip) {
647 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
648 tz->trips.passive.temperature,
649 tz->kelvin_offset);
650 return 0;
651 }
652 trip--;
653 }
654
655 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
656 tz->trips.active[i].flags.valid; i++) {
657 if (!trip) {
658 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
659 tz->trips.active[i].temperature,
660 tz->kelvin_offset);
661 return 0;
662 }
663 trip--;
664 }
665
666 return -EINVAL;
667}
668
669static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
670 int *temperature)
671{
672 struct acpi_thermal *tz = thermal->devdata;
673
674 if (tz->trips.critical.flags.valid) {
675 *temperature = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
676 tz->trips.critical.temperature,
677 tz->kelvin_offset);
678 return 0;
679 } else
680 return -EINVAL;
681}
682
683static int thermal_get_trend(struct thermal_zone_device *thermal,
684 int trip, enum thermal_trend *trend)
685{
686 struct acpi_thermal *tz = thermal->devdata;
687 enum thermal_trip_type type;
688 int i;
689
690 if (thermal_get_trip_type(thermal, trip, &type))
691 return -EINVAL;
692
693 if (type == THERMAL_TRIP_ACTIVE) {
694 int trip_temp;
695 int temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
696 tz->temperature, tz->kelvin_offset);
697 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
698 return -EINVAL;
699
700 if (temp > trip_temp) {
701 *trend = THERMAL_TREND_RAISING;
702 return 0;
703 } else {
704 /* Fall back on default trend */
705 return -EINVAL;
706 }
707 }
708
709 /*
710 * tz->temperature has already been updated by generic thermal layer,
711 * before this callback being invoked
712 */
713 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
714 + (tz->trips.passive.tc2
715 * (tz->temperature - tz->trips.passive.temperature));
716
717 if (i > 0)
718 *trend = THERMAL_TREND_RAISING;
719 else if (i < 0)
720 *trend = THERMAL_TREND_DROPPING;
721 else
722 *trend = THERMAL_TREND_STABLE;
723 return 0;
724}
725
726
727static int thermal_notify(struct thermal_zone_device *thermal, int trip,
728 enum thermal_trip_type trip_type)
729{
730 u8 type = 0;
731 struct acpi_thermal *tz = thermal->devdata;
732
733 if (trip_type == THERMAL_TRIP_CRITICAL)
734 type = ACPI_THERMAL_NOTIFY_CRITICAL;
735 else if (trip_type == THERMAL_TRIP_HOT)
736 type = ACPI_THERMAL_NOTIFY_HOT;
737 else
738 return 0;
739
740 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
741 dev_name(&tz->device->dev), type, 1);
742
743 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
744 return 1;
745
746 return 0;
747}
748
749static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
750 struct thermal_cooling_device *cdev,
751 bool bind)
752{
753 struct acpi_device *device = cdev->devdata;
754 struct acpi_thermal *tz = thermal->devdata;
755 struct acpi_device *dev;
756 acpi_status status;
757 acpi_handle handle;
758 int i;
759 int j;
760 int trip = -1;
761 int result = 0;
762
763 if (tz->trips.critical.flags.valid)
764 trip++;
765
766 if (tz->trips.hot.flags.valid)
767 trip++;
768
769 if (tz->trips.passive.flags.valid) {
770 trip++;
771 for (i = 0; i < tz->trips.passive.devices.count;
772 i++) {
773 handle = tz->trips.passive.devices.handles[i];
774 status = acpi_bus_get_device(handle, &dev);
775 if (ACPI_FAILURE(status) || dev != device)
776 continue;
777 if (bind)
778 result =
779 thermal_zone_bind_cooling_device
780 (thermal, trip, cdev,
781 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
782 THERMAL_WEIGHT_DEFAULT);
783 else
784 result =
785 thermal_zone_unbind_cooling_device
786 (thermal, trip, cdev);
787 if (result)
788 goto failed;
789 }
790 }
791
792 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
793 if (!tz->trips.active[i].flags.valid)
794 break;
795 trip++;
796 for (j = 0;
797 j < tz->trips.active[i].devices.count;
798 j++) {
799 handle = tz->trips.active[i].devices.handles[j];
800 status = acpi_bus_get_device(handle, &dev);
801 if (ACPI_FAILURE(status) || dev != device)
802 continue;
803 if (bind)
804 result = thermal_zone_bind_cooling_device
805 (thermal, trip, cdev,
806 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
807 THERMAL_WEIGHT_DEFAULT);
808 else
809 result = thermal_zone_unbind_cooling_device
810 (thermal, trip, cdev);
811 if (result)
812 goto failed;
813 }
814 }
815
816 for (i = 0; i < tz->devices.count; i++) {
817 handle = tz->devices.handles[i];
818 status = acpi_bus_get_device(handle, &dev);
819 if (ACPI_SUCCESS(status) && (dev == device)) {
820 if (bind)
821 result = thermal_zone_bind_cooling_device
822 (thermal, THERMAL_TRIPS_NONE,
823 cdev, THERMAL_NO_LIMIT,
824 THERMAL_NO_LIMIT,
825 THERMAL_WEIGHT_DEFAULT);
826 else
827 result = thermal_zone_unbind_cooling_device
828 (thermal, THERMAL_TRIPS_NONE,
829 cdev);
830 if (result)
831 goto failed;
832 }
833 }
834
835failed:
836 return result;
837}
838
839static int
840acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
841 struct thermal_cooling_device *cdev)
842{
843 return acpi_thermal_cooling_device_cb(thermal, cdev, true);
844}
845
846static int
847acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
848 struct thermal_cooling_device *cdev)
849{
850 return acpi_thermal_cooling_device_cb(thermal, cdev, false);
851}
852
853static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
854 .bind = acpi_thermal_bind_cooling_device,
855 .unbind = acpi_thermal_unbind_cooling_device,
856 .get_temp = thermal_get_temp,
857 .get_mode = thermal_get_mode,
858 .set_mode = thermal_set_mode,
859 .get_trip_type = thermal_get_trip_type,
860 .get_trip_temp = thermal_get_trip_temp,
861 .get_crit_temp = thermal_get_crit_temp,
862 .get_trend = thermal_get_trend,
863 .notify = thermal_notify,
864};
865
866static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
867{
868 int trips = 0;
869 int result;
870 acpi_status status;
871 int i;
872
873 if (tz->trips.critical.flags.valid)
874 trips++;
875
876 if (tz->trips.hot.flags.valid)
877 trips++;
878
879 if (tz->trips.passive.flags.valid)
880 trips++;
881
882 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
883 tz->trips.active[i].flags.valid; i++, trips++);
884
885 if (tz->trips.passive.flags.valid)
886 tz->thermal_zone =
887 thermal_zone_device_register("acpitz", trips, 0, tz,
888 &acpi_thermal_zone_ops, NULL,
889 tz->trips.passive.tsp*100,
890 tz->polling_frequency*100);
891 else
892 tz->thermal_zone =
893 thermal_zone_device_register("acpitz", trips, 0, tz,
894 &acpi_thermal_zone_ops, NULL,
895 0, tz->polling_frequency*100);
896 if (IS_ERR(tz->thermal_zone))
897 return -ENODEV;
898
899 result = sysfs_create_link(&tz->device->dev.kobj,
900 &tz->thermal_zone->device.kobj, "thermal_zone");
901 if (result)
902 return result;
903
904 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
905 &tz->device->dev.kobj, "device");
906 if (result)
907 return result;
908
909 status = acpi_bus_attach_private_data(tz->device->handle,
910 tz->thermal_zone);
911 if (ACPI_FAILURE(status))
912 return -ENODEV;
913
914 tz->tz_enabled = 1;
915
916 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
917 tz->thermal_zone->id);
918 return 0;
919}
920
921static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
922{
923 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
924 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
925 thermal_zone_device_unregister(tz->thermal_zone);
926 tz->thermal_zone = NULL;
927 acpi_bus_detach_private_data(tz->device->handle);
928}
929
930
931/* --------------------------------------------------------------------------
932 Driver Interface
933 -------------------------------------------------------------------------- */
934
935static void acpi_thermal_notify(struct acpi_device *device, u32 event)
936{
937 struct acpi_thermal *tz = acpi_driver_data(device);
938
939
940 if (!tz)
941 return;
942
943 switch (event) {
944 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
945 acpi_thermal_check(tz);
946 break;
947 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
948 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
949 acpi_thermal_check(tz);
950 acpi_bus_generate_netlink_event(device->pnp.device_class,
951 dev_name(&device->dev), event, 0);
952 break;
953 case ACPI_THERMAL_NOTIFY_DEVICES:
954 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
955 acpi_thermal_check(tz);
956 acpi_bus_generate_netlink_event(device->pnp.device_class,
957 dev_name(&device->dev), event, 0);
958 break;
959 default:
960 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
961 "Unsupported event [0x%x]\n", event));
962 break;
963 }
964}
965
966/*
967 * On some platforms, the AML code has dependency about
968 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
969 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
970 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
971 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
972 * if _TMP has never been evaluated.
973 *
974 * As this dependency is totally transparent to OS, evaluate
975 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
976 * _TMP, before they are actually used.
977 */
978static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
979{
980 acpi_handle handle = tz->device->handle;
981 unsigned long long value;
982 int i;
983
984 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
985 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
986 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
987 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
988 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
989 acpi_status status;
990
991 status = acpi_evaluate_integer(handle, name, NULL, &value);
992 if (status == AE_NOT_FOUND)
993 break;
994 }
995 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
996}
997
998static int acpi_thermal_get_info(struct acpi_thermal *tz)
999{
1000 int result = 0;
1001
1002
1003 if (!tz)
1004 return -EINVAL;
1005
1006 acpi_thermal_aml_dependency_fix(tz);
1007
1008 /* Get trip points [_CRT, _PSV, etc.] (required) */
1009 result = acpi_thermal_get_trip_points(tz);
1010 if (result)
1011 return result;
1012
1013 /* Get temperature [_TMP] (required) */
1014 result = acpi_thermal_get_temperature(tz);
1015 if (result)
1016 return result;
1017
1018 /* Set the cooling mode [_SCP] to active cooling (default) */
1019 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1020 if (!result)
1021 tz->flags.cooling_mode = 1;
1022
1023 /* Get default polling frequency [_TZP] (optional) */
1024 if (tzp)
1025 tz->polling_frequency = tzp;
1026 else
1027 acpi_thermal_get_polling_frequency(tz);
1028
1029 return 0;
1030}
1031
1032/*
1033 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1034 * handles temperature values with a single decimal place. As a consequence,
1035 * some implementations use an offset of 273.1 and others use an offset of
1036 * 273.2. Try to find out which one is being used, to present the most
1037 * accurate and visually appealing number.
1038 *
1039 * The heuristic below should work for all ACPI thermal zones which have a
1040 * critical trip point with a value being a multiple of 0.5 degree Celsius.
1041 */
1042static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1043{
1044 if (tz->trips.critical.flags.valid &&
1045 (tz->trips.critical.temperature % 5) == 1)
1046 tz->kelvin_offset = 2731;
1047 else
1048 tz->kelvin_offset = 2732;
1049}
1050
1051static void acpi_thermal_check_fn(struct work_struct *work)
1052{
1053 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1054 thermal_check_work);
1055 acpi_thermal_check(tz);
1056}
1057
1058static int acpi_thermal_add(struct acpi_device *device)
1059{
1060 int result = 0;
1061 struct acpi_thermal *tz = NULL;
1062
1063
1064 if (!device)
1065 return -EINVAL;
1066
1067 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1068 if (!tz)
1069 return -ENOMEM;
1070
1071 tz->device = device;
1072 strcpy(tz->name, device->pnp.bus_id);
1073 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1074 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1075 device->driver_data = tz;
1076
1077 result = acpi_thermal_get_info(tz);
1078 if (result)
1079 goto free_memory;
1080
1081 acpi_thermal_guess_offset(tz);
1082
1083 result = acpi_thermal_register_thermal_zone(tz);
1084 if (result)
1085 goto free_memory;
1086
1087 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1088
1089 pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
1090 acpi_device_bid(device), DECI_KELVIN_TO_CELSIUS(tz->temperature));
1091 goto end;
1092
1093free_memory:
1094 kfree(tz);
1095end:
1096 return result;
1097}
1098
1099static int acpi_thermal_remove(struct acpi_device *device)
1100{
1101 struct acpi_thermal *tz = NULL;
1102
1103 if (!device || !acpi_driver_data(device))
1104 return -EINVAL;
1105
1106 flush_workqueue(acpi_thermal_pm_queue);
1107 tz = acpi_driver_data(device);
1108
1109 acpi_thermal_unregister_thermal_zone(tz);
1110 kfree(tz);
1111 return 0;
1112}
1113
1114#ifdef CONFIG_PM_SLEEP
1115static int acpi_thermal_suspend(struct device *dev)
1116{
1117 /* Make sure the previously queued thermal check work has been done */
1118 flush_workqueue(acpi_thermal_pm_queue);
1119 return 0;
1120}
1121
1122static int acpi_thermal_resume(struct device *dev)
1123{
1124 struct acpi_thermal *tz;
1125 int i, j, power_state, result;
1126
1127 if (!dev)
1128 return -EINVAL;
1129
1130 tz = acpi_driver_data(to_acpi_device(dev));
1131 if (!tz)
1132 return -EINVAL;
1133
1134 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1135 if (!(&tz->trips.active[i]))
1136 break;
1137 if (!tz->trips.active[i].flags.valid)
1138 break;
1139 tz->trips.active[i].flags.enabled = 1;
1140 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1141 result = acpi_bus_update_power(
1142 tz->trips.active[i].devices.handles[j],
1143 &power_state);
1144 if (result || (power_state != ACPI_STATE_D0)) {
1145 tz->trips.active[i].flags.enabled = 0;
1146 break;
1147 }
1148 }
1149 tz->state.active |= tz->trips.active[i].flags.enabled;
1150 }
1151
1152 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
1153
1154 return AE_OK;
1155}
1156#endif
1157
1158static int thermal_act(const struct dmi_system_id *d) {
1159
1160 if (act == 0) {
1161 pr_notice(PREFIX "%s detected: "
1162 "disabling all active thermal trip points\n", d->ident);
1163 act = -1;
1164 }
1165 return 0;
1166}
1167static int thermal_nocrt(const struct dmi_system_id *d) {
1168
1169 pr_notice(PREFIX "%s detected: "
1170 "disabling all critical thermal trip point actions.\n", d->ident);
1171 nocrt = 1;
1172 return 0;
1173}
1174static int thermal_tzp(const struct dmi_system_id *d) {
1175
1176 if (tzp == 0) {
1177 pr_notice(PREFIX "%s detected: "
1178 "enabling thermal zone polling\n", d->ident);
1179 tzp = 300; /* 300 dS = 30 Seconds */
1180 }
1181 return 0;
1182}
1183static int thermal_psv(const struct dmi_system_id *d) {
1184
1185 if (psv == 0) {
1186 pr_notice(PREFIX "%s detected: "
1187 "disabling all passive thermal trip points\n", d->ident);
1188 psv = -1;
1189 }
1190 return 0;
1191}
1192
1193static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1194 /*
1195 * Award BIOS on this AOpen makes thermal control almost worthless.
1196 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1197 */
1198 {
1199 .callback = thermal_act,
1200 .ident = "AOpen i915GMm-HFS",
1201 .matches = {
1202 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1203 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1204 },
1205 },
1206 {
1207 .callback = thermal_psv,
1208 .ident = "AOpen i915GMm-HFS",
1209 .matches = {
1210 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1211 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1212 },
1213 },
1214 {
1215 .callback = thermal_tzp,
1216 .ident = "AOpen i915GMm-HFS",
1217 .matches = {
1218 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1219 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1220 },
1221 },
1222 {
1223 .callback = thermal_nocrt,
1224 .ident = "Gigabyte GA-7ZX",
1225 .matches = {
1226 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1227 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1228 },
1229 },
1230 {}
1231};
1232
1233static int __init acpi_thermal_init(void)
1234{
1235 int result = 0;
1236
1237 dmi_check_system(thermal_dmi_table);
1238
1239 if (off) {
1240 pr_notice(PREFIX "thermal control disabled\n");
1241 return -ENODEV;
1242 }
1243
1244 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1245 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1246 if (!acpi_thermal_pm_queue)
1247 return -ENODEV;
1248
1249 result = acpi_bus_register_driver(&acpi_thermal_driver);
1250 if (result < 0) {
1251 destroy_workqueue(acpi_thermal_pm_queue);
1252 return -ENODEV;
1253 }
1254
1255 return 0;
1256}
1257
1258static void __exit acpi_thermal_exit(void)
1259{
1260 acpi_bus_unregister_driver(&acpi_thermal_driver);
1261 destroy_workqueue(acpi_thermal_pm_queue);
1262
1263 return;
1264}
1265
1266module_init(acpi_thermal_init);
1267module_exit(acpi_thermal_exit);