1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
4 *
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 *
8 * This driver fully implements the ACPI thermal policy as described in the
9 * ACPI 2.0 Specification.
10 *
11 * TBD: 1. Implement passive cooling hysteresis.
12 * 2. Enhance passive cooling (CPU) states/limit interface to support
13 * concepts of 'multiple limiters', upper/lower limits, etc.
14 */
15
16#define pr_fmt(fmt) "ACPI: thermal: " fmt
17
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/dmi.h>
21#include <linux/init.h>
22#include <linux/slab.h>
23#include <linux/types.h>
24#include <linux/jiffies.h>
25#include <linux/kmod.h>
26#include <linux/reboot.h>
27#include <linux/device.h>
28#include <linux/thermal.h>
29#include <linux/acpi.h>
30#include <linux/workqueue.h>
31#include <linux/uaccess.h>
32#include <linux/units.h>
33
34#define ACPI_THERMAL_CLASS "thermal_zone"
35#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
36#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
37#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
38#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
39#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
40#define ACPI_THERMAL_NOTIFY_HOT 0xF1
41#define ACPI_THERMAL_MODE_ACTIVE 0x00
42
43#define ACPI_THERMAL_MAX_ACTIVE 10
44#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
45
46#define ACPI_THERMAL_TRIP_PASSIVE (-1)
47
48/*
49 * This exception is thrown out in two cases:
50 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
51 * when re-evaluating the AML code.
52 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
53 * We need to re-bind the cooling devices of a thermal zone when this occurs.
54 */
55#define ACPI_THERMAL_TRIPS_EXCEPTION(tz, str) \
56do { \
57 acpi_handle_info(tz->device->handle, \
58 "ACPI thermal trip point %s changed\n" \
59 "Please report to linux-acpi@vger.kernel.org\n", str); \
60} while (0)
61
62static int act;
63module_param(act, int, 0644);
64MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
65
66static int crt;
67module_param(crt, int, 0644);
68MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
69
70static int tzp;
71module_param(tzp, int, 0444);
72MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
73
74static int off;
75module_param(off, int, 0);
76MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
77
78static int psv;
79module_param(psv, int, 0644);
80MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
81
82static struct workqueue_struct *acpi_thermal_pm_queue;
83
84struct acpi_thermal_trip {
85 unsigned long temp_dk;
86 struct acpi_handle_list devices;
87};
88
89struct acpi_thermal_passive {
90 struct acpi_thermal_trip trip;
91 unsigned long tc1;
92 unsigned long tc2;
93 unsigned long tsp;
94};
95
96struct acpi_thermal_active {
97 struct acpi_thermal_trip trip;
98};
99
100struct acpi_thermal_trips {
101 struct acpi_thermal_passive passive;
102 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
103};
104
105struct acpi_thermal {
106 struct acpi_device *device;
107 acpi_bus_id name;
108 unsigned long temp_dk;
109 unsigned long last_temp_dk;
110 unsigned long polling_frequency;
111 volatile u8 zombie;
112 struct acpi_thermal_trips trips;
113 struct thermal_trip *trip_table;
114 struct thermal_zone_device *thermal_zone;
115 int kelvin_offset; /* in millidegrees */
116 struct work_struct thermal_check_work;
117 struct mutex thermal_check_lock;
118 refcount_t thermal_check_count;
119};
120
121/* --------------------------------------------------------------------------
122 Thermal Zone Management
123 -------------------------------------------------------------------------- */
124
125static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
126{
127 acpi_status status = AE_OK;
128 unsigned long long tmp;
129
130 if (!tz)
131 return -EINVAL;
132
133 tz->last_temp_dk = tz->temp_dk;
134
135 status = acpi_evaluate_integer(handle: tz->device->handle, pathname: "_TMP", NULL, data: &tmp);
136 if (ACPI_FAILURE(status))
137 return -ENODEV;
138
139 tz->temp_dk = tmp;
140
141 acpi_handle_debug(tz->device->handle, "Temperature is %lu dK\n",
142 tz->temp_dk);
143
144 return 0;
145}
146
147static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
148{
149 acpi_status status = AE_OK;
150 unsigned long long tmp;
151
152 if (!tz)
153 return -EINVAL;
154
155 status = acpi_evaluate_integer(handle: tz->device->handle, pathname: "_TZP", NULL, data: &tmp);
156 if (ACPI_FAILURE(status))
157 return -ENODEV;
158
159 tz->polling_frequency = tmp;
160 acpi_handle_debug(tz->device->handle, "Polling frequency is %lu dS\n",
161 tz->polling_frequency);
162
163 return 0;
164}
165
166static int acpi_thermal_temp(struct acpi_thermal *tz, int temp_deci_k)
167{
168 if (temp_deci_k == THERMAL_TEMP_INVALID)
169 return THERMAL_TEMP_INVALID;
170
171 return deci_kelvin_to_millicelsius_with_offset(t: temp_deci_k,
172 offset: tz->kelvin_offset);
173}
174
175static bool acpi_thermal_trip_valid(struct acpi_thermal_trip *acpi_trip)
176{
177 return acpi_trip->temp_dk != THERMAL_TEMP_INVALID;
178}
179
180static int active_trip_index(struct acpi_thermal *tz,
181 struct acpi_thermal_trip *acpi_trip)
182{
183 struct acpi_thermal_active *active;
184
185 active = container_of(acpi_trip, struct acpi_thermal_active, trip);
186 return active - tz->trips.active;
187}
188
189static long get_passive_temp(struct acpi_thermal *tz)
190{
191 unsigned long long tmp;
192 acpi_status status;
193
194 status = acpi_evaluate_integer(handle: tz->device->handle, pathname: "_PSV", NULL, data: &tmp);
195 if (ACPI_FAILURE(status))
196 return THERMAL_TEMP_INVALID;
197
198 return tmp;
199}
200
201static long get_active_temp(struct acpi_thermal *tz, int index)
202{
203 char method[] = { '_', 'A', 'C', '0' + index, '\0' };
204 unsigned long long tmp;
205 acpi_status status;
206
207 status = acpi_evaluate_integer(handle: tz->device->handle, pathname: method, NULL, data: &tmp);
208 if (ACPI_FAILURE(status))
209 return THERMAL_TEMP_INVALID;
210
211 /*
212 * If an override has been provided, apply it so there are no active
213 * trips with thresholds greater than the override.
214 */
215 if (act > 0) {
216 unsigned long long override = celsius_to_deci_kelvin(t: act);
217
218 if (tmp > override)
219 tmp = override;
220 }
221 return tmp;
222}
223
224static void acpi_thermal_update_trip(struct acpi_thermal *tz,
225 const struct thermal_trip *trip)
226{
227 struct acpi_thermal_trip *acpi_trip = trip->priv;
228
229 if (trip->type == THERMAL_TRIP_PASSIVE) {
230 if (psv > 0)
231 return;
232
233 acpi_trip->temp_dk = get_passive_temp(tz);
234 } else {
235 int index = active_trip_index(tz, acpi_trip);
236
237 acpi_trip->temp_dk = get_active_temp(tz, index);
238 }
239
240 if (!acpi_thermal_trip_valid(acpi_trip))
241 ACPI_THERMAL_TRIPS_EXCEPTION(tz, "state");
242}
243
244static bool update_trip_devices(struct acpi_thermal *tz,
245 struct acpi_thermal_trip *acpi_trip,
246 int index, bool compare)
247{
248 struct acpi_handle_list devices = { 0 };
249 char method[] = "_PSL";
250 acpi_status status;
251
252 if (index != ACPI_THERMAL_TRIP_PASSIVE) {
253 method[1] = 'A';
254 method[2] = 'L';
255 method[3] = '0' + index;
256 }
257
258 status = acpi_evaluate_reference(handle: tz->device->handle, pathname: method, NULL, list: &devices);
259 if (ACPI_FAILURE(status)) {
260 acpi_handle_info(tz->device->handle, "%s evaluation failure\n", method);
261 return false;
262 }
263
264 if (acpi_handle_list_equal(list1: &acpi_trip->devices, list2: &devices)) {
265 acpi_handle_list_free(list: &devices);
266 return true;
267 }
268
269 if (compare)
270 ACPI_THERMAL_TRIPS_EXCEPTION(tz, "device");
271
272 acpi_handle_list_replace(dst: &acpi_trip->devices, src: &devices);
273 return true;
274}
275
276static void acpi_thermal_update_trip_devices(struct acpi_thermal *tz,
277 const struct thermal_trip *trip)
278{
279 struct acpi_thermal_trip *acpi_trip = trip->priv;
280 int index = trip->type == THERMAL_TRIP_PASSIVE ?
281 ACPI_THERMAL_TRIP_PASSIVE : active_trip_index(tz, acpi_trip);
282
283 if (update_trip_devices(tz, acpi_trip, index, compare: true))
284 return;
285
286 acpi_trip->temp_dk = THERMAL_TEMP_INVALID;
287 ACPI_THERMAL_TRIPS_EXCEPTION(tz, "state");
288}
289
290struct adjust_trip_data {
291 struct acpi_thermal *tz;
292 u32 event;
293};
294
295static int acpi_thermal_adjust_trip(struct thermal_trip *trip, void *data)
296{
297 struct acpi_thermal_trip *acpi_trip = trip->priv;
298 struct adjust_trip_data *atd = data;
299 struct acpi_thermal *tz = atd->tz;
300
301 if (!acpi_trip || !acpi_thermal_trip_valid(acpi_trip))
302 return 0;
303
304 if (atd->event == ACPI_THERMAL_NOTIFY_THRESHOLDS)
305 acpi_thermal_update_trip(tz, trip);
306 else
307 acpi_thermal_update_trip_devices(tz, trip);
308
309 if (acpi_thermal_trip_valid(acpi_trip))
310 trip->temperature = acpi_thermal_temp(tz, temp_deci_k: acpi_trip->temp_dk);
311 else
312 trip->temperature = THERMAL_TEMP_INVALID;
313
314 return 0;
315}
316
317static void acpi_queue_thermal_check(struct acpi_thermal *tz)
318{
319 if (!work_pending(&tz->thermal_check_work))
320 queue_work(wq: acpi_thermal_pm_queue, work: &tz->thermal_check_work);
321}
322
323static void acpi_thermal_trips_update(struct acpi_thermal *tz, u32 event)
324{
325 struct adjust_trip_data atd = { .tz = tz, .event = event };
326 struct acpi_device *adev = tz->device;
327
328 /*
329 * Use thermal_zone_for_each_trip() to carry out the trip points
330 * update, so as to protect thermal_get_trend() from getting stale
331 * trip point temperatures and to prevent thermal_zone_device_update()
332 * invoked from acpi_thermal_check_fn() from producing inconsistent
333 * results.
334 */
335 thermal_zone_for_each_trip(tz: tz->thermal_zone,
336 cb: acpi_thermal_adjust_trip, data: &atd);
337 acpi_queue_thermal_check(tz);
338 acpi_bus_generate_netlink_event(adev->pnp.device_class,
339 dev_name(dev: &adev->dev), event, 0);
340}
341
342static long acpi_thermal_get_critical_trip(struct acpi_thermal *tz)
343{
344 unsigned long long tmp;
345 acpi_status status;
346
347 if (crt > 0) {
348 tmp = celsius_to_deci_kelvin(t: crt);
349 goto set;
350 }
351 if (crt == -1) {
352 acpi_handle_debug(tz->device->handle, "Critical threshold disabled\n");
353 return THERMAL_TEMP_INVALID;
354 }
355
356 status = acpi_evaluate_integer(handle: tz->device->handle, pathname: "_CRT", NULL, data: &tmp);
357 if (ACPI_FAILURE(status)) {
358 acpi_handle_debug(tz->device->handle, "No critical threshold\n");
359 return THERMAL_TEMP_INVALID;
360 }
361 if (tmp <= 2732) {
362 /*
363 * Below zero (Celsius) values clearly aren't right for sure,
364 * so discard them as invalid.
365 */
366 pr_info(FW_BUG "Invalid critical threshold (%llu)\n", tmp);
367 return THERMAL_TEMP_INVALID;
368 }
369
370set:
371 acpi_handle_debug(tz->device->handle, "Critical threshold [%llu]\n", tmp);
372 return tmp;
373}
374
375static long acpi_thermal_get_hot_trip(struct acpi_thermal *tz)
376{
377 unsigned long long tmp;
378 acpi_status status;
379
380 status = acpi_evaluate_integer(handle: tz->device->handle, pathname: "_HOT", NULL, data: &tmp);
381 if (ACPI_FAILURE(status)) {
382 acpi_handle_debug(tz->device->handle, "No hot threshold\n");
383 return THERMAL_TEMP_INVALID;
384 }
385
386 acpi_handle_debug(tz->device->handle, "Hot threshold [%llu]\n", tmp);
387 return tmp;
388}
389
390static bool passive_trip_params_init(struct acpi_thermal *tz)
391{
392 unsigned long long tmp;
393 acpi_status status;
394
395 status = acpi_evaluate_integer(handle: tz->device->handle, pathname: "_TC1", NULL, data: &tmp);
396 if (ACPI_FAILURE(status))
397 return false;
398
399 tz->trips.passive.tc1 = tmp;
400
401 status = acpi_evaluate_integer(handle: tz->device->handle, pathname: "_TC2", NULL, data: &tmp);
402 if (ACPI_FAILURE(status))
403 return false;
404
405 tz->trips.passive.tc2 = tmp;
406
407 status = acpi_evaluate_integer(handle: tz->device->handle, pathname: "_TSP", NULL, data: &tmp);
408 if (ACPI_FAILURE(status))
409 return false;
410
411 tz->trips.passive.tsp = tmp;
412
413 return true;
414}
415
416static bool acpi_thermal_init_trip(struct acpi_thermal *tz, int index)
417{
418 struct acpi_thermal_trip *acpi_trip;
419 long temp;
420
421 if (index == ACPI_THERMAL_TRIP_PASSIVE) {
422 acpi_trip = &tz->trips.passive.trip;
423
424 if (psv == -1)
425 goto fail;
426
427 if (!passive_trip_params_init(tz))
428 goto fail;
429
430 temp = psv > 0 ? celsius_to_deci_kelvin(t: psv) :
431 get_passive_temp(tz);
432 } else {
433 acpi_trip = &tz->trips.active[index].trip;
434
435 if (act == -1)
436 goto fail;
437
438 temp = get_active_temp(tz, index);
439 }
440
441 if (temp == THERMAL_TEMP_INVALID)
442 goto fail;
443
444 if (!update_trip_devices(tz, acpi_trip, index, compare: false))
445 goto fail;
446
447 acpi_trip->temp_dk = temp;
448 return true;
449
450fail:
451 acpi_trip->temp_dk = THERMAL_TEMP_INVALID;
452 return false;
453}
454
455static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
456{
457 unsigned int count = 0;
458 int i;
459
460 if (acpi_thermal_init_trip(tz, ACPI_THERMAL_TRIP_PASSIVE))
461 count++;
462
463 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
464 if (acpi_thermal_init_trip(tz, index: i))
465 count++;
466 else
467 break;
468
469 }
470
471 while (++i < ACPI_THERMAL_MAX_ACTIVE)
472 tz->trips.active[i].trip.temp_dk = THERMAL_TEMP_INVALID;
473
474 return count;
475}
476
477/* sys I/F for generic thermal sysfs support */
478
479static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
480{
481 struct acpi_thermal *tz = thermal_zone_device_priv(tzd: thermal);
482 int result;
483
484 if (!tz)
485 return -EINVAL;
486
487 result = acpi_thermal_get_temperature(tz);
488 if (result)
489 return result;
490
491 *temp = deci_kelvin_to_millicelsius_with_offset(t: tz->temp_dk,
492 offset: tz->kelvin_offset);
493 return 0;
494}
495
496static int thermal_get_trend(struct thermal_zone_device *thermal,
497 const struct thermal_trip *trip,
498 enum thermal_trend *trend)
499{
500 struct acpi_thermal *tz = thermal_zone_device_priv(tzd: thermal);
501 struct acpi_thermal_trip *acpi_trip;
502 int t;
503
504 if (!tz || !trip)
505 return -EINVAL;
506
507 acpi_trip = trip->priv;
508 if (!acpi_trip || !acpi_thermal_trip_valid(acpi_trip))
509 return -EINVAL;
510
511 switch (trip->type) {
512 case THERMAL_TRIP_PASSIVE:
513 t = tz->trips.passive.tc1 * (tz->temp_dk -
514 tz->last_temp_dk) +
515 tz->trips.passive.tc2 * (tz->temp_dk -
516 acpi_trip->temp_dk);
517 if (t > 0)
518 *trend = THERMAL_TREND_RAISING;
519 else if (t < 0)
520 *trend = THERMAL_TREND_DROPPING;
521 else
522 *trend = THERMAL_TREND_STABLE;
523
524 return 0;
525
526 case THERMAL_TRIP_ACTIVE:
527 t = acpi_thermal_temp(tz, temp_deci_k: tz->temp_dk);
528 if (t <= trip->temperature)
529 break;
530
531 *trend = THERMAL_TREND_RAISING;
532
533 return 0;
534
535 default:
536 break;
537 }
538
539 return -EINVAL;
540}
541
542static void acpi_thermal_zone_device_hot(struct thermal_zone_device *thermal)
543{
544 struct acpi_thermal *tz = thermal_zone_device_priv(tzd: thermal);
545
546 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
547 dev_name(dev: &tz->device->dev),
548 ACPI_THERMAL_NOTIFY_HOT, 1);
549}
550
551static void acpi_thermal_zone_device_critical(struct thermal_zone_device *thermal)
552{
553 struct acpi_thermal *tz = thermal_zone_device_priv(tzd: thermal);
554
555 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
556 dev_name(dev: &tz->device->dev),
557 ACPI_THERMAL_NOTIFY_CRITICAL, 1);
558
559 thermal_zone_device_critical(tz: thermal);
560}
561
562struct acpi_thermal_bind_data {
563 struct thermal_zone_device *thermal;
564 struct thermal_cooling_device *cdev;
565 bool bind;
566};
567
568static int bind_unbind_cdev_cb(struct thermal_trip *trip, void *arg)
569{
570 struct acpi_thermal_trip *acpi_trip = trip->priv;
571 struct acpi_thermal_bind_data *bd = arg;
572 struct thermal_zone_device *thermal = bd->thermal;
573 struct thermal_cooling_device *cdev = bd->cdev;
574 struct acpi_device *cdev_adev = cdev->devdata;
575 int i;
576
577 /* Skip critical and hot trips. */
578 if (!acpi_trip)
579 return 0;
580
581 for (i = 0; i < acpi_trip->devices.count; i++) {
582 acpi_handle handle = acpi_trip->devices.handles[i];
583 struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
584
585 if (adev != cdev_adev)
586 continue;
587
588 if (bd->bind) {
589 int ret;
590
591 ret = thermal_bind_cdev_to_trip(tz: thermal, trip, cdev,
592 THERMAL_NO_LIMIT,
593 THERMAL_NO_LIMIT,
594 THERMAL_WEIGHT_DEFAULT);
595 if (ret)
596 return ret;
597 } else {
598 thermal_unbind_cdev_from_trip(tz: thermal, trip, cdev);
599 }
600 }
601
602 return 0;
603}
604
605static int acpi_thermal_bind_unbind_cdev(struct thermal_zone_device *thermal,
606 struct thermal_cooling_device *cdev,
607 bool bind)
608{
609 struct acpi_thermal_bind_data bd = {
610 .thermal = thermal, .cdev = cdev, .bind = bind
611 };
612
613 return for_each_thermal_trip(tz: thermal, cb: bind_unbind_cdev_cb, data: &bd);
614}
615
616static int
617acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
618 struct thermal_cooling_device *cdev)
619{
620 return acpi_thermal_bind_unbind_cdev(thermal, cdev, bind: true);
621}
622
623static int
624acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
625 struct thermal_cooling_device *cdev)
626{
627 return acpi_thermal_bind_unbind_cdev(thermal, cdev, bind: false);
628}
629
630static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
631 .bind = acpi_thermal_bind_cooling_device,
632 .unbind = acpi_thermal_unbind_cooling_device,
633 .get_temp = thermal_get_temp,
634 .get_trend = thermal_get_trend,
635 .hot = acpi_thermal_zone_device_hot,
636 .critical = acpi_thermal_zone_device_critical,
637};
638
639static int acpi_thermal_zone_sysfs_add(struct acpi_thermal *tz)
640{
641 struct device *tzdev = thermal_zone_device(tzd: tz->thermal_zone);
642 int ret;
643
644 ret = sysfs_create_link(kobj: &tz->device->dev.kobj,
645 target: &tzdev->kobj, name: "thermal_zone");
646 if (ret)
647 return ret;
648
649 ret = sysfs_create_link(kobj: &tzdev->kobj,
650 target: &tz->device->dev.kobj, name: "device");
651 if (ret)
652 sysfs_remove_link(kobj: &tz->device->dev.kobj, name: "thermal_zone");
653
654 return ret;
655}
656
657static void acpi_thermal_zone_sysfs_remove(struct acpi_thermal *tz)
658{
659 struct device *tzdev = thermal_zone_device(tzd: tz->thermal_zone);
660
661 sysfs_remove_link(kobj: &tz->device->dev.kobj, name: "thermal_zone");
662 sysfs_remove_link(kobj: &tzdev->kobj, name: "device");
663}
664
665static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz,
666 unsigned int trip_count,
667 int passive_delay)
668{
669 int result;
670
671 tz->thermal_zone = thermal_zone_device_register_with_trips(type: "acpitz",
672 trips: tz->trip_table,
673 num_trips: trip_count,
674 mask: 0, devdata: tz,
675 ops: &acpi_thermal_zone_ops,
676 NULL,
677 passive_delay,
678 polling_delay: tz->polling_frequency * 100);
679 if (IS_ERR(ptr: tz->thermal_zone))
680 return PTR_ERR(ptr: tz->thermal_zone);
681
682 result = acpi_thermal_zone_sysfs_add(tz);
683 if (result)
684 goto unregister_tzd;
685
686 result = thermal_zone_device_enable(tz: tz->thermal_zone);
687 if (result)
688 goto remove_links;
689
690 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
691 thermal_zone_device_id(tz->thermal_zone));
692
693 return 0;
694
695remove_links:
696 acpi_thermal_zone_sysfs_remove(tz);
697unregister_tzd:
698 thermal_zone_device_unregister(tz: tz->thermal_zone);
699
700 return result;
701}
702
703static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
704{
705 thermal_zone_device_disable(tz: tz->thermal_zone);
706 acpi_thermal_zone_sysfs_remove(tz);
707 thermal_zone_device_unregister(tz: tz->thermal_zone);
708 tz->thermal_zone = NULL;
709}
710
711
712/* --------------------------------------------------------------------------
713 Driver Interface
714 -------------------------------------------------------------------------- */
715
716static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
717{
718 struct acpi_device *device = data;
719 struct acpi_thermal *tz = acpi_driver_data(d: device);
720
721 if (!tz)
722 return;
723
724 switch (event) {
725 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
726 acpi_queue_thermal_check(tz);
727 break;
728 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
729 case ACPI_THERMAL_NOTIFY_DEVICES:
730 acpi_thermal_trips_update(tz, event);
731 break;
732 default:
733 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
734 event);
735 break;
736 }
737}
738
739/*
740 * On some platforms, the AML code has dependency about
741 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
742 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
743 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
744 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
745 * if _TMP has never been evaluated.
746 *
747 * As this dependency is totally transparent to OS, evaluate
748 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
749 * _TMP, before they are actually used.
750 */
751static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
752{
753 acpi_handle handle = tz->device->handle;
754 unsigned long long value;
755 int i;
756
757 acpi_evaluate_integer(handle, pathname: "_CRT", NULL, data: &value);
758 acpi_evaluate_integer(handle, pathname: "_HOT", NULL, data: &value);
759 acpi_evaluate_integer(handle, pathname: "_PSV", NULL, data: &value);
760 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
761 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
762 acpi_status status;
763
764 status = acpi_evaluate_integer(handle, pathname: name, NULL, data: &value);
765 if (status == AE_NOT_FOUND)
766 break;
767 }
768 acpi_evaluate_integer(handle, pathname: "_TMP", NULL, data: &value);
769}
770
771/*
772 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
773 * handles temperature values with a single decimal place. As a consequence,
774 * some implementations use an offset of 273.1 and others use an offset of
775 * 273.2. Try to find out which one is being used, to present the most
776 * accurate and visually appealing number.
777 *
778 * The heuristic below should work for all ACPI thermal zones which have a
779 * critical trip point with a value being a multiple of 0.5 degree Celsius.
780 */
781static void acpi_thermal_guess_offset(struct acpi_thermal *tz, long crit_temp)
782{
783 if (crit_temp != THERMAL_TEMP_INVALID && crit_temp % 5 == 1)
784 tz->kelvin_offset = 273100;
785 else
786 tz->kelvin_offset = 273200;
787}
788
789static void acpi_thermal_check_fn(struct work_struct *work)
790{
791 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
792 thermal_check_work);
793
794 /*
795 * In general, it is not sufficient to check the pending bit, because
796 * subsequent instances of this function may be queued after one of them
797 * has started running (e.g. if _TMP sleeps). Avoid bailing out if just
798 * one of them is running, though, because it may have done the actual
799 * check some time ago, so allow at least one of them to block on the
800 * mutex while another one is running the update.
801 */
802 if (!refcount_dec_not_one(r: &tz->thermal_check_count))
803 return;
804
805 mutex_lock(&tz->thermal_check_lock);
806
807 thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED);
808
809 refcount_inc(r: &tz->thermal_check_count);
810
811 mutex_unlock(lock: &tz->thermal_check_lock);
812}
813
814static void acpi_thermal_free_thermal_zone(struct acpi_thermal *tz)
815{
816 int i;
817
818 acpi_handle_list_free(list: &tz->trips.passive.trip.devices);
819 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
820 acpi_handle_list_free(list: &tz->trips.active[i].trip.devices);
821
822 kfree(objp: tz);
823}
824
825static int acpi_thermal_add(struct acpi_device *device)
826{
827 struct acpi_thermal_trip *acpi_trip;
828 struct thermal_trip *trip;
829 struct acpi_thermal *tz;
830 unsigned int trip_count;
831 int crit_temp, hot_temp;
832 int passive_delay = 0;
833 int result;
834 int i;
835
836 if (!device)
837 return -EINVAL;
838
839 tz = kzalloc(size: sizeof(struct acpi_thermal), GFP_KERNEL);
840 if (!tz)
841 return -ENOMEM;
842
843 tz->device = device;
844 strcpy(p: tz->name, q: device->pnp.bus_id);
845 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
846 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
847 device->driver_data = tz;
848
849 acpi_thermal_aml_dependency_fix(tz);
850
851 /* Get trip points [_CRT, _PSV, etc.] (required). */
852 trip_count = acpi_thermal_get_trip_points(tz);
853
854 crit_temp = acpi_thermal_get_critical_trip(tz);
855 if (crit_temp != THERMAL_TEMP_INVALID)
856 trip_count++;
857
858 hot_temp = acpi_thermal_get_hot_trip(tz);
859 if (hot_temp != THERMAL_TEMP_INVALID)
860 trip_count++;
861
862 if (!trip_count) {
863 pr_warn(FW_BUG "No valid trip points!\n");
864 result = -ENODEV;
865 goto free_memory;
866 }
867
868 /* Get temperature [_TMP] (required). */
869 result = acpi_thermal_get_temperature(tz);
870 if (result)
871 goto free_memory;
872
873 /* Set the cooling mode [_SCP] to active cooling. */
874 acpi_execute_simple_method(handle: tz->device->handle, method: "_SCP",
875 ACPI_THERMAL_MODE_ACTIVE);
876
877 /* Determine the default polling frequency [_TZP]. */
878 if (tzp)
879 tz->polling_frequency = tzp;
880 else
881 acpi_thermal_get_polling_frequency(tz);
882
883 acpi_thermal_guess_offset(tz, crit_temp);
884
885 trip = kcalloc(n: trip_count, size: sizeof(*trip), GFP_KERNEL);
886 if (!trip) {
887 result = -ENOMEM;
888 goto free_memory;
889 }
890
891 tz->trip_table = trip;
892
893 if (crit_temp != THERMAL_TEMP_INVALID) {
894 trip->type = THERMAL_TRIP_CRITICAL;
895 trip->temperature = acpi_thermal_temp(tz, temp_deci_k: crit_temp);
896 trip++;
897 }
898
899 if (hot_temp != THERMAL_TEMP_INVALID) {
900 trip->type = THERMAL_TRIP_HOT;
901 trip->temperature = acpi_thermal_temp(tz, temp_deci_k: hot_temp);
902 trip++;
903 }
904
905 acpi_trip = &tz->trips.passive.trip;
906 if (acpi_thermal_trip_valid(acpi_trip)) {
907 passive_delay = tz->trips.passive.tsp * 100;
908
909 trip->type = THERMAL_TRIP_PASSIVE;
910 trip->temperature = acpi_thermal_temp(tz, temp_deci_k: acpi_trip->temp_dk);
911 trip->priv = acpi_trip;
912 trip++;
913 }
914
915 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
916 acpi_trip = &tz->trips.active[i].trip;
917
918 if (!acpi_thermal_trip_valid(acpi_trip))
919 break;
920
921 trip->type = THERMAL_TRIP_ACTIVE;
922 trip->temperature = acpi_thermal_temp(tz, temp_deci_k: acpi_trip->temp_dk);
923 trip->priv = acpi_trip;
924 trip++;
925 }
926
927 result = acpi_thermal_register_thermal_zone(tz, trip_count, passive_delay);
928 if (result)
929 goto free_trips;
930
931 refcount_set(r: &tz->thermal_check_count, n: 3);
932 mutex_init(&tz->thermal_check_lock);
933 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
934
935 pr_info("%s [%s] (%ld C)\n", acpi_device_name(device),
936 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temp_dk));
937
938 result = acpi_dev_install_notify_handler(adev: device, ACPI_DEVICE_NOTIFY,
939 handler: acpi_thermal_notify, context: device);
940 if (result)
941 goto flush_wq;
942
943 return 0;
944
945flush_wq:
946 flush_workqueue(acpi_thermal_pm_queue);
947 acpi_thermal_unregister_thermal_zone(tz);
948free_trips:
949 kfree(objp: tz->trip_table);
950free_memory:
951 acpi_thermal_free_thermal_zone(tz);
952
953 return result;
954}
955
956static void acpi_thermal_remove(struct acpi_device *device)
957{
958 struct acpi_thermal *tz;
959
960 if (!device || !acpi_driver_data(d: device))
961 return;
962
963 tz = acpi_driver_data(d: device);
964
965 acpi_dev_remove_notify_handler(adev: device, ACPI_DEVICE_NOTIFY,
966 handler: acpi_thermal_notify);
967
968 flush_workqueue(acpi_thermal_pm_queue);
969 acpi_thermal_unregister_thermal_zone(tz);
970 kfree(objp: tz->trip_table);
971 acpi_thermal_free_thermal_zone(tz);
972}
973
974#ifdef CONFIG_PM_SLEEP
975static int acpi_thermal_suspend(struct device *dev)
976{
977 /* Make sure the previously queued thermal check work has been done */
978 flush_workqueue(acpi_thermal_pm_queue);
979 return 0;
980}
981
982static int acpi_thermal_resume(struct device *dev)
983{
984 struct acpi_thermal *tz;
985 int i, j, power_state;
986
987 if (!dev)
988 return -EINVAL;
989
990 tz = acpi_driver_data(to_acpi_device(dev));
991 if (!tz)
992 return -EINVAL;
993
994 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
995 struct acpi_thermal_trip *acpi_trip = &tz->trips.active[i].trip;
996
997 if (!acpi_thermal_trip_valid(acpi_trip))
998 break;
999
1000 for (j = 0; j < acpi_trip->devices.count; j++) {
1001 acpi_bus_update_power(handle: acpi_trip->devices.handles[j],
1002 state_p: &power_state);
1003 }
1004 }
1005
1006 acpi_queue_thermal_check(tz);
1007
1008 return AE_OK;
1009}
1010#else
1011#define acpi_thermal_suspend NULL
1012#define acpi_thermal_resume NULL
1013#endif
1014static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
1015
1016static const struct acpi_device_id thermal_device_ids[] = {
1017 {ACPI_THERMAL_HID, 0},
1018 {"", 0},
1019};
1020MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
1021
1022static struct acpi_driver acpi_thermal_driver = {
1023 .name = "thermal",
1024 .class = ACPI_THERMAL_CLASS,
1025 .ids = thermal_device_ids,
1026 .ops = {
1027 .add = acpi_thermal_add,
1028 .remove = acpi_thermal_remove,
1029 },
1030 .drv.pm = &acpi_thermal_pm,
1031};
1032
1033static int thermal_act(const struct dmi_system_id *d)
1034{
1035 if (act == 0) {
1036 pr_notice("%s detected: disabling all active thermal trip points\n",
1037 d->ident);
1038 act = -1;
1039 }
1040 return 0;
1041}
1042
1043static int thermal_nocrt(const struct dmi_system_id *d)
1044{
1045 pr_notice("%s detected: disabling all critical thermal trip point actions.\n",
1046 d->ident);
1047 crt = -1;
1048 return 0;
1049}
1050
1051static int thermal_tzp(const struct dmi_system_id *d)
1052{
1053 if (tzp == 0) {
1054 pr_notice("%s detected: enabling thermal zone polling\n",
1055 d->ident);
1056 tzp = 300; /* 300 dS = 30 Seconds */
1057 }
1058 return 0;
1059}
1060
1061static int thermal_psv(const struct dmi_system_id *d)
1062{
1063 if (psv == 0) {
1064 pr_notice("%s detected: disabling all passive thermal trip points\n",
1065 d->ident);
1066 psv = -1;
1067 }
1068 return 0;
1069}
1070
1071static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1072 /*
1073 * Award BIOS on this AOpen makes thermal control almost worthless.
1074 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1075 */
1076 {
1077 .callback = thermal_act,
1078 .ident = "AOpen i915GMm-HFS",
1079 .matches = {
1080 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1081 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1082 },
1083 },
1084 {
1085 .callback = thermal_psv,
1086 .ident = "AOpen i915GMm-HFS",
1087 .matches = {
1088 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1089 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1090 },
1091 },
1092 {
1093 .callback = thermal_tzp,
1094 .ident = "AOpen i915GMm-HFS",
1095 .matches = {
1096 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1097 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1098 },
1099 },
1100 {
1101 .callback = thermal_nocrt,
1102 .ident = "Gigabyte GA-7ZX",
1103 .matches = {
1104 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1105 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1106 },
1107 },
1108 {}
1109};
1110
1111static int __init acpi_thermal_init(void)
1112{
1113 int result;
1114
1115 dmi_check_system(list: thermal_dmi_table);
1116
1117 if (off) {
1118 pr_notice("thermal control disabled\n");
1119 return -ENODEV;
1120 }
1121
1122 acpi_thermal_pm_queue = alloc_workqueue(fmt: "acpi_thermal_pm",
1123 flags: WQ_HIGHPRI | WQ_MEM_RECLAIM, max_active: 0);
1124 if (!acpi_thermal_pm_queue)
1125 return -ENODEV;
1126
1127 result = acpi_bus_register_driver(driver: &acpi_thermal_driver);
1128 if (result < 0) {
1129 destroy_workqueue(wq: acpi_thermal_pm_queue);
1130 return -ENODEV;
1131 }
1132
1133 return 0;
1134}
1135
1136static void __exit acpi_thermal_exit(void)
1137{
1138 acpi_bus_unregister_driver(driver: &acpi_thermal_driver);
1139 destroy_workqueue(wq: acpi_thermal_pm_queue);
1140}
1141
1142module_init(acpi_thermal_init);
1143module_exit(acpi_thermal_exit);
1144
1145MODULE_AUTHOR("Paul Diefenbaugh");
1146MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
1147MODULE_LICENSE("GPL");
1148

source code of linux/drivers/acpi/thermal.c