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