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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * thermal.c - Generic Thermal Management Sysfs support.
4 *
5 * Copyright (C) 2008 Intel Corp
6 * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
7 * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/device.h>
13#include <linux/err.h>
14#include <linux/export.h>
15#include <linux/slab.h>
16#include <linux/kdev_t.h>
17#include <linux/idr.h>
18#include <linux/thermal.h>
19#include <linux/reboot.h>
20#include <linux/string.h>
21#include <linux/of.h>
22#include <linux/suspend.h>
23
24#define CREATE_TRACE_POINTS
25#include <trace/events/thermal.h>
26
27#include "thermal_core.h"
28#include "thermal_hwmon.h"
29
30static DEFINE_IDA(thermal_tz_ida);
31static DEFINE_IDA(thermal_cdev_ida);
32
33static LIST_HEAD(thermal_tz_list);
34static LIST_HEAD(thermal_cdev_list);
35static LIST_HEAD(thermal_governor_list);
36
37static DEFINE_MUTEX(thermal_list_lock);
38static DEFINE_MUTEX(thermal_governor_lock);
39
40static atomic_t in_suspend;
41
42static struct thermal_governor *def_governor;
43
44/*
45 * Governor section: set of functions to handle thermal governors
46 *
47 * Functions to help in the life cycle of thermal governors within
48 * the thermal core and by the thermal governor code.
49 */
50
51static struct thermal_governor *__find_governor(const char *name)
52{
53 struct thermal_governor *pos;
54
55 if (!name || !name[0])
56 return def_governor;
57
58 list_for_each_entry(pos, &thermal_governor_list, governor_list)
59 if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH))
60 return pos;
61
62 return NULL;
63}
64
65/**
66 * bind_previous_governor() - bind the previous governor of the thermal zone
67 * @tz: a valid pointer to a struct thermal_zone_device
68 * @failed_gov_name: the name of the governor that failed to register
69 *
70 * Register the previous governor of the thermal zone after a new
71 * governor has failed to be bound.
72 */
73static void bind_previous_governor(struct thermal_zone_device *tz,
74 const char *failed_gov_name)
75{
76 if (tz->governor && tz->governor->bind_to_tz) {
77 if (tz->governor->bind_to_tz(tz)) {
78 dev_err(&tz->device,
79 "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n",
80 failed_gov_name, tz->governor->name, tz->type);
81 tz->governor = NULL;
82 }
83 }
84}
85
86/**
87 * thermal_set_governor() - Switch to another governor
88 * @tz: a valid pointer to a struct thermal_zone_device
89 * @new_gov: pointer to the new governor
90 *
91 * Change the governor of thermal zone @tz.
92 *
93 * Return: 0 on success, an error if the new governor's bind_to_tz() failed.
94 */
95static int thermal_set_governor(struct thermal_zone_device *tz,
96 struct thermal_governor *new_gov)
97{
98 int ret = 0;
99
100 if (tz->governor && tz->governor->unbind_from_tz)
101 tz->governor->unbind_from_tz(tz);
102
103 if (new_gov && new_gov->bind_to_tz) {
104 ret = new_gov->bind_to_tz(tz);
105 if (ret) {
106 bind_previous_governor(tz, new_gov->name);
107
108 return ret;
109 }
110 }
111
112 tz->governor = new_gov;
113
114 return ret;
115}
116
117int thermal_register_governor(struct thermal_governor *governor)
118{
119 int err;
120 const char *name;
121 struct thermal_zone_device *pos;
122
123 if (!governor)
124 return -EINVAL;
125
126 mutex_lock(&thermal_governor_lock);
127
128 err = -EBUSY;
129 if (!__find_governor(governor->name)) {
130 bool match_default;
131
132 err = 0;
133 list_add(&governor->governor_list, &thermal_governor_list);
134 match_default = !strncmp(governor->name,
135 DEFAULT_THERMAL_GOVERNOR,
136 THERMAL_NAME_LENGTH);
137
138 if (!def_governor && match_default)
139 def_governor = governor;
140 }
141
142 mutex_lock(&thermal_list_lock);
143
144 list_for_each_entry(pos, &thermal_tz_list, node) {
145 /*
146 * only thermal zones with specified tz->tzp->governor_name
147 * may run with tz->govenor unset
148 */
149 if (pos->governor)
150 continue;
151
152 name = pos->tzp->governor_name;
153
154 if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) {
155 int ret;
156
157 ret = thermal_set_governor(pos, governor);
158 if (ret)
159 dev_err(&pos->device,
160 "Failed to set governor %s for thermal zone %s: %d\n",
161 governor->name, pos->type, ret);
162 }
163 }
164
165 mutex_unlock(&thermal_list_lock);
166 mutex_unlock(&thermal_governor_lock);
167
168 return err;
169}
170
171void thermal_unregister_governor(struct thermal_governor *governor)
172{
173 struct thermal_zone_device *pos;
174
175 if (!governor)
176 return;
177
178 mutex_lock(&thermal_governor_lock);
179
180 if (!__find_governor(governor->name))
181 goto exit;
182
183 mutex_lock(&thermal_list_lock);
184
185 list_for_each_entry(pos, &thermal_tz_list, node) {
186 if (!strncasecmp(pos->governor->name, governor->name,
187 THERMAL_NAME_LENGTH))
188 thermal_set_governor(pos, NULL);
189 }
190
191 mutex_unlock(&thermal_list_lock);
192 list_del(&governor->governor_list);
193exit:
194 mutex_unlock(&thermal_governor_lock);
195}
196
197int thermal_zone_device_set_policy(struct thermal_zone_device *tz,
198 char *policy)
199{
200 struct thermal_governor *gov;
201 int ret = -EINVAL;
202
203 mutex_lock(&thermal_governor_lock);
204 mutex_lock(&tz->lock);
205
206 gov = __find_governor(strim(policy));
207 if (!gov)
208 goto exit;
209
210 ret = thermal_set_governor(tz, gov);
211
212exit:
213 mutex_unlock(&tz->lock);
214 mutex_unlock(&thermal_governor_lock);
215
216 thermal_notify_tz_gov_change(tz->id, policy);
217
218 return ret;
219}
220
221int thermal_build_list_of_policies(char *buf)
222{
223 struct thermal_governor *pos;
224 ssize_t count = 0;
225
226 mutex_lock(&thermal_governor_lock);
227
228 list_for_each_entry(pos, &thermal_governor_list, governor_list) {
229 count += scnprintf(buf + count, PAGE_SIZE - count, "%s ",
230 pos->name);
231 }
232 count += scnprintf(buf + count, PAGE_SIZE - count, "\n");
233
234 mutex_unlock(&thermal_governor_lock);
235
236 return count;
237}
238
239static void __init thermal_unregister_governors(void)
240{
241 struct thermal_governor **governor;
242
243 for_each_governor_table(governor)
244 thermal_unregister_governor(*governor);
245}
246
247static int __init thermal_register_governors(void)
248{
249 int ret = 0;
250 struct thermal_governor **governor;
251
252 for_each_governor_table(governor) {
253 ret = thermal_register_governor(*governor);
254 if (ret) {
255 pr_err("Failed to register governor: '%s'",
256 (*governor)->name);
257 break;
258 }
259
260 pr_info("Registered thermal governor '%s'",
261 (*governor)->name);
262 }
263
264 if (ret) {
265 struct thermal_governor **gov;
266
267 for_each_governor_table(gov) {
268 if (gov == governor)
269 break;
270 thermal_unregister_governor(*gov);
271 }
272 }
273
274 return ret;
275}
276
277/*
278 * Zone update section: main control loop applied to each zone while monitoring
279 *
280 * in polling mode. The monitoring is done using a workqueue.
281 * Same update may be done on a zone by calling thermal_zone_device_update().
282 *
283 * An update means:
284 * - Non-critical trips will invoke the governor responsible for that zone;
285 * - Hot trips will produce a notification to userspace;
286 * - Critical trip point will cause a system shutdown.
287 */
288static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
289 unsigned long delay)
290{
291 if (delay)
292 mod_delayed_work(system_freezable_power_efficient_wq,
293 &tz->poll_queue, delay);
294 else
295 cancel_delayed_work(&tz->poll_queue);
296}
297
298static inline bool should_stop_polling(struct thermal_zone_device *tz)
299{
300 return !thermal_zone_device_is_enabled(tz);
301}
302
303static void monitor_thermal_zone(struct thermal_zone_device *tz)
304{
305 bool stop;
306
307 stop = should_stop_polling(tz);
308
309 mutex_lock(&tz->lock);
310
311 if (!stop && tz->passive)
312 thermal_zone_device_set_polling(tz, tz->passive_delay_jiffies);
313 else if (!stop && tz->polling_delay_jiffies)
314 thermal_zone_device_set_polling(tz, tz->polling_delay_jiffies);
315 else
316 thermal_zone_device_set_polling(tz, 0);
317
318 mutex_unlock(&tz->lock);
319}
320
321static void handle_non_critical_trips(struct thermal_zone_device *tz, int trip)
322{
323 tz->governor ? tz->governor->throttle(tz, trip) :
324 def_governor->throttle(tz, trip);
325}
326
327void thermal_zone_device_critical(struct thermal_zone_device *tz)
328{
329 /*
330 * poweroff_delay_ms must be a carefully profiled positive value.
331 * Its a must for forced_emergency_poweroff_work to be scheduled.
332 */
333 int poweroff_delay_ms = CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS;
334
335 dev_emerg(&tz->device, "%s: critical temperature reached, "
336 "shutting down\n", tz->type);
337
338 hw_protection_shutdown("Temperature too high", poweroff_delay_ms);
339}
340EXPORT_SYMBOL(thermal_zone_device_critical);
341
342static void handle_critical_trips(struct thermal_zone_device *tz,
343 int trip, enum thermal_trip_type trip_type)
344{
345 int trip_temp;
346
347 tz->ops->get_trip_temp(tz, trip, &trip_temp);
348
349 /* If we have not crossed the trip_temp, we do not care. */
350 if (trip_temp <= 0 || tz->temperature < trip_temp)
351 return;
352
353 trace_thermal_zone_trip(tz, trip, trip_type);
354
355 if (trip_type == THERMAL_TRIP_HOT && tz->ops->hot)
356 tz->ops->hot(tz);
357 else if (trip_type == THERMAL_TRIP_CRITICAL)
358 tz->ops->critical(tz);
359}
360
361static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
362{
363 enum thermal_trip_type type;
364 int trip_temp, hyst = 0;
365
366 /* Ignore disabled trip points */
367 if (test_bit(trip, &tz->trips_disabled))
368 return;
369
370 tz->ops->get_trip_temp(tz, trip, &trip_temp);
371 tz->ops->get_trip_type(tz, trip, &type);
372 if (tz->ops->get_trip_hyst)
373 tz->ops->get_trip_hyst(tz, trip, &hyst);
374
375 if (tz->last_temperature != THERMAL_TEMP_INVALID) {
376 if (tz->last_temperature < trip_temp &&
377 tz->temperature >= trip_temp)
378 thermal_notify_tz_trip_up(tz->id, trip);
379 if (tz->last_temperature >= trip_temp &&
380 tz->temperature < (trip_temp - hyst))
381 thermal_notify_tz_trip_down(tz->id, trip);
382 }
383
384 if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
385 handle_critical_trips(tz, trip, type);
386 else
387 handle_non_critical_trips(tz, trip);
388 /*
389 * Alright, we handled this trip successfully.
390 * So, start monitoring again.
391 */
392 monitor_thermal_zone(tz);
393}
394
395static void update_temperature(struct thermal_zone_device *tz)
396{
397 int temp, ret;
398
399 ret = thermal_zone_get_temp(tz, &temp);
400 if (ret) {
401 if (ret != -EAGAIN)
402 dev_warn(&tz->device,
403 "failed to read out thermal zone (%d)\n",
404 ret);
405 return;
406 }
407
408 mutex_lock(&tz->lock);
409 tz->last_temperature = tz->temperature;
410 tz->temperature = temp;
411 mutex_unlock(&tz->lock);
412
413 trace_thermal_temperature(tz);
414
415 thermal_genl_sampling_temp(tz->id, temp);
416}
417
418static void thermal_zone_device_init(struct thermal_zone_device *tz)
419{
420 struct thermal_instance *pos;
421 tz->temperature = THERMAL_TEMP_INVALID;
422 list_for_each_entry(pos, &tz->thermal_instances, tz_node)
423 pos->initialized = false;
424}
425
426static int thermal_zone_device_set_mode(struct thermal_zone_device *tz,
427 enum thermal_device_mode mode)
428{
429 int ret = 0;
430
431 mutex_lock(&tz->lock);
432
433 /* do nothing if mode isn't changing */
434 if (mode == tz->mode) {
435 mutex_unlock(&tz->lock);
436
437 return ret;
438 }
439
440 if (tz->ops->change_mode)
441 ret = tz->ops->change_mode(tz, mode);
442
443 if (!ret)
444 tz->mode = mode;
445
446 mutex_unlock(&tz->lock);
447
448 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
449
450 if (mode == THERMAL_DEVICE_ENABLED)
451 thermal_notify_tz_enable(tz->id);
452 else
453 thermal_notify_tz_disable(tz->id);
454
455 return ret;
456}
457
458int thermal_zone_device_enable(struct thermal_zone_device *tz)
459{
460 return thermal_zone_device_set_mode(tz, THERMAL_DEVICE_ENABLED);
461}
462EXPORT_SYMBOL_GPL(thermal_zone_device_enable);
463
464int thermal_zone_device_disable(struct thermal_zone_device *tz)
465{
466 return thermal_zone_device_set_mode(tz, THERMAL_DEVICE_DISABLED);
467}
468EXPORT_SYMBOL_GPL(thermal_zone_device_disable);
469
470int thermal_zone_device_is_enabled(struct thermal_zone_device *tz)
471{
472 enum thermal_device_mode mode;
473
474 mutex_lock(&tz->lock);
475
476 mode = tz->mode;
477
478 mutex_unlock(&tz->lock);
479
480 return mode == THERMAL_DEVICE_ENABLED;
481}
482
483void thermal_zone_device_update(struct thermal_zone_device *tz,
484 enum thermal_notify_event event)
485{
486 int count;
487
488 if (should_stop_polling(tz))
489 return;
490
491 if (atomic_read(&in_suspend))
492 return;
493
494 if (WARN_ONCE(!tz->ops->get_temp, "'%s' must not be called without "
495 "'get_temp' ops set\n", __func__))
496 return;
497
498 update_temperature(tz);
499
500 thermal_zone_set_trips(tz);
501
502 tz->notify_event = event;
503
504 for (count = 0; count < tz->trips; count++)
505 handle_thermal_trip(tz, count);
506}
507EXPORT_SYMBOL_GPL(thermal_zone_device_update);
508
509static void thermal_zone_device_check(struct work_struct *work)
510{
511 struct thermal_zone_device *tz = container_of(work, struct
512 thermal_zone_device,
513 poll_queue.work);
514 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
515}
516
517int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *),
518 void *data)
519{
520 struct thermal_governor *gov;
521 int ret = 0;
522
523 mutex_lock(&thermal_governor_lock);
524 list_for_each_entry(gov, &thermal_governor_list, governor_list) {
525 ret = cb(gov, data);
526 if (ret)
527 break;
528 }
529 mutex_unlock(&thermal_governor_lock);
530
531 return ret;
532}
533
534int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *,
535 void *), void *data)
536{
537 struct thermal_cooling_device *cdev;
538 int ret = 0;
539
540 mutex_lock(&thermal_list_lock);
541 list_for_each_entry(cdev, &thermal_cdev_list, node) {
542 ret = cb(cdev, data);
543 if (ret)
544 break;
545 }
546 mutex_unlock(&thermal_list_lock);
547
548 return ret;
549}
550
551int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *, void *),
552 void *data)
553{
554 struct thermal_zone_device *tz;
555 int ret = 0;
556
557 mutex_lock(&thermal_list_lock);
558 list_for_each_entry(tz, &thermal_tz_list, node) {
559 ret = cb(tz, data);
560 if (ret)
561 break;
562 }
563 mutex_unlock(&thermal_list_lock);
564
565 return ret;
566}
567
568struct thermal_zone_device *thermal_zone_get_by_id(int id)
569{
570 struct thermal_zone_device *tz, *match = NULL;
571
572 mutex_lock(&thermal_list_lock);
573 list_for_each_entry(tz, &thermal_tz_list, node) {
574 if (tz->id == id) {
575 match = tz;
576 break;
577 }
578 }
579 mutex_unlock(&thermal_list_lock);
580
581 return match;
582}
583
584/*
585 * Device management section: cooling devices, zones devices, and binding
586 *
587 * Set of functions provided by the thermal core for:
588 * - cooling devices lifecycle: registration, unregistration,
589 * binding, and unbinding.
590 * - thermal zone devices lifecycle: registration, unregistration,
591 * binding, and unbinding.
592 */
593
594/**
595 * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
596 * @tz: pointer to struct thermal_zone_device
597 * @trip: indicates which trip point the cooling devices is
598 * associated with in this thermal zone.
599 * @cdev: pointer to struct thermal_cooling_device
600 * @upper: the Maximum cooling state for this trip point.
601 * THERMAL_NO_LIMIT means no upper limit,
602 * and the cooling device can be in max_state.
603 * @lower: the Minimum cooling state can be used for this trip point.
604 * THERMAL_NO_LIMIT means no lower limit,
605 * and the cooling device can be in cooling state 0.
606 * @weight: The weight of the cooling device to be bound to the
607 * thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
608 * default value
609 *
610 * This interface function bind a thermal cooling device to the certain trip
611 * point of a thermal zone device.
612 * This function is usually called in the thermal zone device .bind callback.
613 *
614 * Return: 0 on success, the proper error value otherwise.
615 */
616int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
617 int trip,
618 struct thermal_cooling_device *cdev,
619 unsigned long upper, unsigned long lower,
620 unsigned int weight)
621{
622 struct thermal_instance *dev;
623 struct thermal_instance *pos;
624 struct thermal_zone_device *pos1;
625 struct thermal_cooling_device *pos2;
626 unsigned long max_state;
627 int result, ret;
628
629 if (trip >= tz->trips || trip < 0)
630 return -EINVAL;
631
632 list_for_each_entry(pos1, &thermal_tz_list, node) {
633 if (pos1 == tz)
634 break;
635 }
636 list_for_each_entry(pos2, &thermal_cdev_list, node) {
637 if (pos2 == cdev)
638 break;
639 }
640
641 if (tz != pos1 || cdev != pos2)
642 return -EINVAL;
643
644 ret = cdev->ops->get_max_state(cdev, &max_state);
645 if (ret)
646 return ret;
647
648 /* lower default 0, upper default max_state */
649 lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
650 upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
651
652 if (lower > upper || upper > max_state)
653 return -EINVAL;
654
655 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
656 if (!dev)
657 return -ENOMEM;
658 dev->tz = tz;
659 dev->cdev = cdev;
660 dev->trip = trip;
661 dev->upper = upper;
662 dev->lower = lower;
663 dev->target = THERMAL_NO_TARGET;
664 dev->weight = weight;
665
666 result = ida_simple_get(&tz->ida, 0, 0, GFP_KERNEL);
667 if (result < 0)
668 goto free_mem;
669
670 dev->id = result;
671 sprintf(dev->name, "cdev%d", dev->id);
672 result =
673 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
674 if (result)
675 goto release_ida;
676
677 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
678 sysfs_attr_init(&dev->attr.attr);
679 dev->attr.attr.name = dev->attr_name;
680 dev->attr.attr.mode = 0444;
681 dev->attr.show = trip_point_show;
682 result = device_create_file(&tz->device, &dev->attr);
683 if (result)
684 goto remove_symbol_link;
685
686 sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
687 sysfs_attr_init(&dev->weight_attr.attr);
688 dev->weight_attr.attr.name = dev->weight_attr_name;
689 dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
690 dev->weight_attr.show = weight_show;
691 dev->weight_attr.store = weight_store;
692 result = device_create_file(&tz->device, &dev->weight_attr);
693 if (result)
694 goto remove_trip_file;
695
696 mutex_lock(&tz->lock);
697 mutex_lock(&cdev->lock);
698 list_for_each_entry(pos, &tz->thermal_instances, tz_node)
699 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
700 result = -EEXIST;
701 break;
702 }
703 if (!result) {
704 list_add_tail(&dev->tz_node, &tz->thermal_instances);
705 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
706 atomic_set(&tz->need_update, 1);
707 }
708 mutex_unlock(&cdev->lock);
709 mutex_unlock(&tz->lock);
710
711 if (!result)
712 return 0;
713
714 device_remove_file(&tz->device, &dev->weight_attr);
715remove_trip_file:
716 device_remove_file(&tz->device, &dev->attr);
717remove_symbol_link:
718 sysfs_remove_link(&tz->device.kobj, dev->name);
719release_ida:
720 ida_simple_remove(&tz->ida, dev->id);
721free_mem:
722 kfree(dev);
723 return result;
724}
725EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
726
727/**
728 * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
729 * thermal zone.
730 * @tz: pointer to a struct thermal_zone_device.
731 * @trip: indicates which trip point the cooling devices is
732 * associated with in this thermal zone.
733 * @cdev: pointer to a struct thermal_cooling_device.
734 *
735 * This interface function unbind a thermal cooling device from the certain
736 * trip point of a thermal zone device.
737 * This function is usually called in the thermal zone device .unbind callback.
738 *
739 * Return: 0 on success, the proper error value otherwise.
740 */
741int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
742 int trip,
743 struct thermal_cooling_device *cdev)
744{
745 struct thermal_instance *pos, *next;
746
747 mutex_lock(&tz->lock);
748 mutex_lock(&cdev->lock);
749 list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
750 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
751 list_del(&pos->tz_node);
752 list_del(&pos->cdev_node);
753 mutex_unlock(&cdev->lock);
754 mutex_unlock(&tz->lock);
755 goto unbind;
756 }
757 }
758 mutex_unlock(&cdev->lock);
759 mutex_unlock(&tz->lock);
760
761 return -ENODEV;
762
763unbind:
764 device_remove_file(&tz->device, &pos->weight_attr);
765 device_remove_file(&tz->device, &pos->attr);
766 sysfs_remove_link(&tz->device.kobj, pos->name);
767 ida_simple_remove(&tz->ida, pos->id);
768 kfree(pos);
769 return 0;
770}
771EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
772
773static void thermal_release(struct device *dev)
774{
775 struct thermal_zone_device *tz;
776 struct thermal_cooling_device *cdev;
777
778 if (!strncmp(dev_name(dev), "thermal_zone",
779 sizeof("thermal_zone") - 1)) {
780 tz = to_thermal_zone(dev);
781 thermal_zone_destroy_device_groups(tz);
782 kfree(tz);
783 } else if (!strncmp(dev_name(dev), "cooling_device",
784 sizeof("cooling_device") - 1)) {
785 cdev = to_cooling_device(dev);
786 kfree(cdev);
787 }
788}
789
790static struct class thermal_class = {
791 .name = "thermal",
792 .dev_release = thermal_release,
793};
794
795static inline
796void print_bind_err_msg(struct thermal_zone_device *tz,
797 struct thermal_cooling_device *cdev, int ret)
798{
799 dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
800 tz->type, cdev->type, ret);
801}
802
803static void __bind(struct thermal_zone_device *tz, int mask,
804 struct thermal_cooling_device *cdev,
805 unsigned long *limits,
806 unsigned int weight)
807{
808 int i, ret;
809
810 for (i = 0; i < tz->trips; i++) {
811 if (mask & (1 << i)) {
812 unsigned long upper, lower;
813
814 upper = THERMAL_NO_LIMIT;
815 lower = THERMAL_NO_LIMIT;
816 if (limits) {
817 lower = limits[i * 2];
818 upper = limits[i * 2 + 1];
819 }
820 ret = thermal_zone_bind_cooling_device(tz, i, cdev,
821 upper, lower,
822 weight);
823 if (ret)
824 print_bind_err_msg(tz, cdev, ret);
825 }
826 }
827}
828
829static void bind_cdev(struct thermal_cooling_device *cdev)
830{
831 int i, ret;
832 const struct thermal_zone_params *tzp;
833 struct thermal_zone_device *pos = NULL;
834
835 mutex_lock(&thermal_list_lock);
836
837 list_for_each_entry(pos, &thermal_tz_list, node) {
838 if (!pos->tzp && !pos->ops->bind)
839 continue;
840
841 if (pos->ops->bind) {
842 ret = pos->ops->bind(pos, cdev);
843 if (ret)
844 print_bind_err_msg(pos, cdev, ret);
845 continue;
846 }
847
848 tzp = pos->tzp;
849 if (!tzp || !tzp->tbp)
850 continue;
851
852 for (i = 0; i < tzp->num_tbps; i++) {
853 if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
854 continue;
855 if (tzp->tbp[i].match(pos, cdev))
856 continue;
857 tzp->tbp[i].cdev = cdev;
858 __bind(pos, tzp->tbp[i].trip_mask, cdev,
859 tzp->tbp[i].binding_limits,
860 tzp->tbp[i].weight);
861 }
862 }
863
864 mutex_unlock(&thermal_list_lock);
865}
866
867/**
868 * __thermal_cooling_device_register() - register a new thermal cooling device
869 * @np: a pointer to a device tree node.
870 * @type: the thermal cooling device type.
871 * @devdata: device private data.
872 * @ops: standard thermal cooling devices callbacks.
873 *
874 * This interface function adds a new thermal cooling device (fan/processor/...)
875 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
876 * to all the thermal zone devices registered at the same time.
877 * It also gives the opportunity to link the cooling device to a device tree
878 * node, so that it can be bound to a thermal zone created out of device tree.
879 *
880 * Return: a pointer to the created struct thermal_cooling_device or an
881 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
882 */
883static struct thermal_cooling_device *
884__thermal_cooling_device_register(struct device_node *np,
885 const char *type, void *devdata,
886 const struct thermal_cooling_device_ops *ops)
887{
888 struct thermal_cooling_device *cdev;
889 struct thermal_zone_device *pos = NULL;
890 int ret;
891
892 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
893 !ops->set_cur_state)
894 return ERR_PTR(-EINVAL);
895
896 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
897 if (!cdev)
898 return ERR_PTR(-ENOMEM);
899
900 ret = ida_simple_get(&thermal_cdev_ida, 0, 0, GFP_KERNEL);
901 if (ret < 0)
902 goto out_kfree_cdev;
903 cdev->id = ret;
904
905 cdev->type = kstrdup(type ? type : "", GFP_KERNEL);
906 if (!cdev->type) {
907 ret = -ENOMEM;
908 goto out_ida_remove;
909 }
910
911 mutex_init(&cdev->lock);
912 INIT_LIST_HEAD(&cdev->thermal_instances);
913 cdev->np = np;
914 cdev->ops = ops;
915 cdev->updated = false;
916 cdev->device.class = &thermal_class;
917 cdev->devdata = devdata;
918 thermal_cooling_device_setup_sysfs(cdev);
919 dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
920 ret = device_register(&cdev->device);
921 if (ret)
922 goto out_kfree_type;
923
924 /* Add 'this' new cdev to the global cdev list */
925 mutex_lock(&thermal_list_lock);
926 list_add(&cdev->node, &thermal_cdev_list);
927 mutex_unlock(&thermal_list_lock);
928
929 /* Update binding information for 'this' new cdev */
930 bind_cdev(cdev);
931
932 mutex_lock(&thermal_list_lock);
933 list_for_each_entry(pos, &thermal_tz_list, node)
934 if (atomic_cmpxchg(&pos->need_update, 1, 0))
935 thermal_zone_device_update(pos,
936 THERMAL_EVENT_UNSPECIFIED);
937 mutex_unlock(&thermal_list_lock);
938
939 return cdev;
940
941out_kfree_type:
942 kfree(cdev->type);
943 put_device(&cdev->device);
944out_ida_remove:
945 ida_simple_remove(&thermal_cdev_ida, cdev->id);
946out_kfree_cdev:
947 kfree(cdev);
948 return ERR_PTR(ret);
949}
950
951/**
952 * thermal_cooling_device_register() - register a new thermal cooling device
953 * @type: the thermal cooling device type.
954 * @devdata: device private data.
955 * @ops: standard thermal cooling devices callbacks.
956 *
957 * This interface function adds a new thermal cooling device (fan/processor/...)
958 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
959 * to all the thermal zone devices registered at the same time.
960 *
961 * Return: a pointer to the created struct thermal_cooling_device or an
962 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
963 */
964struct thermal_cooling_device *
965thermal_cooling_device_register(const char *type, void *devdata,
966 const struct thermal_cooling_device_ops *ops)
967{
968 return __thermal_cooling_device_register(NULL, type, devdata, ops);
969}
970EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
971
972/**
973 * thermal_of_cooling_device_register() - register an OF thermal cooling device
974 * @np: a pointer to a device tree node.
975 * @type: the thermal cooling device type.
976 * @devdata: device private data.
977 * @ops: standard thermal cooling devices callbacks.
978 *
979 * This function will register a cooling device with device tree node reference.
980 * This interface function adds a new thermal cooling device (fan/processor/...)
981 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
982 * to all the thermal zone devices registered at the same time.
983 *
984 * Return: a pointer to the created struct thermal_cooling_device or an
985 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
986 */
987struct thermal_cooling_device *
988thermal_of_cooling_device_register(struct device_node *np,
989 const char *type, void *devdata,
990 const struct thermal_cooling_device_ops *ops)
991{
992 return __thermal_cooling_device_register(np, type, devdata, ops);
993}
994EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
995
996static void thermal_cooling_device_release(struct device *dev, void *res)
997{
998 thermal_cooling_device_unregister(
999 *(struct thermal_cooling_device **)res);
1000}
1001
1002/**
1003 * devm_thermal_of_cooling_device_register() - register an OF thermal cooling
1004 * device
1005 * @dev: a valid struct device pointer of a sensor device.
1006 * @np: a pointer to a device tree node.
1007 * @type: the thermal cooling device type.
1008 * @devdata: device private data.
1009 * @ops: standard thermal cooling devices callbacks.
1010 *
1011 * This function will register a cooling device with device tree node reference.
1012 * This interface function adds a new thermal cooling device (fan/processor/...)
1013 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1014 * to all the thermal zone devices registered at the same time.
1015 *
1016 * Return: a pointer to the created struct thermal_cooling_device or an
1017 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1018 */
1019struct thermal_cooling_device *
1020devm_thermal_of_cooling_device_register(struct device *dev,
1021 struct device_node *np,
1022 char *type, void *devdata,
1023 const struct thermal_cooling_device_ops *ops)
1024{
1025 struct thermal_cooling_device **ptr, *tcd;
1026
1027 ptr = devres_alloc(thermal_cooling_device_release, sizeof(*ptr),
1028 GFP_KERNEL);
1029 if (!ptr)
1030 return ERR_PTR(-ENOMEM);
1031
1032 tcd = __thermal_cooling_device_register(np, type, devdata, ops);
1033 if (IS_ERR(tcd)) {
1034 devres_free(ptr);
1035 return tcd;
1036 }
1037
1038 *ptr = tcd;
1039 devres_add(dev, ptr);
1040
1041 return tcd;
1042}
1043EXPORT_SYMBOL_GPL(devm_thermal_of_cooling_device_register);
1044
1045static void __unbind(struct thermal_zone_device *tz, int mask,
1046 struct thermal_cooling_device *cdev)
1047{
1048 int i;
1049
1050 for (i = 0; i < tz->trips; i++)
1051 if (mask & (1 << i))
1052 thermal_zone_unbind_cooling_device(tz, i, cdev);
1053}
1054
1055/**
1056 * thermal_cooling_device_unregister - removes a thermal cooling device
1057 * @cdev: the thermal cooling device to remove.
1058 *
1059 * thermal_cooling_device_unregister() must be called when a registered
1060 * thermal cooling device is no longer needed.
1061 */
1062void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1063{
1064 int i;
1065 const struct thermal_zone_params *tzp;
1066 struct thermal_zone_device *tz;
1067 struct thermal_cooling_device *pos = NULL;
1068
1069 if (!cdev)
1070 return;
1071
1072 mutex_lock(&thermal_list_lock);
1073 list_for_each_entry(pos, &thermal_cdev_list, node)
1074 if (pos == cdev)
1075 break;
1076 if (pos != cdev) {
1077 /* thermal cooling device not found */
1078 mutex_unlock(&thermal_list_lock);
1079 return;
1080 }
1081 list_del(&cdev->node);
1082
1083 /* Unbind all thermal zones associated with 'this' cdev */
1084 list_for_each_entry(tz, &thermal_tz_list, node) {
1085 if (tz->ops->unbind) {
1086 tz->ops->unbind(tz, cdev);
1087 continue;
1088 }
1089
1090 if (!tz->tzp || !tz->tzp->tbp)
1091 continue;
1092
1093 tzp = tz->tzp;
1094 for (i = 0; i < tzp->num_tbps; i++) {
1095 if (tzp->tbp[i].cdev == cdev) {
1096 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1097 tzp->tbp[i].cdev = NULL;
1098 }
1099 }
1100 }
1101
1102 mutex_unlock(&thermal_list_lock);
1103
1104 ida_simple_remove(&thermal_cdev_ida, cdev->id);
1105 device_del(&cdev->device);
1106 thermal_cooling_device_destroy_sysfs(cdev);
1107 kfree(cdev->type);
1108 put_device(&cdev->device);
1109}
1110EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1111
1112static void bind_tz(struct thermal_zone_device *tz)
1113{
1114 int i, ret;
1115 struct thermal_cooling_device *pos = NULL;
1116 const struct thermal_zone_params *tzp = tz->tzp;
1117
1118 if (!tzp && !tz->ops->bind)
1119 return;
1120
1121 mutex_lock(&thermal_list_lock);
1122
1123 /* If there is ops->bind, try to use ops->bind */
1124 if (tz->ops->bind) {
1125 list_for_each_entry(pos, &thermal_cdev_list, node) {
1126 ret = tz->ops->bind(tz, pos);
1127 if (ret)
1128 print_bind_err_msg(tz, pos, ret);
1129 }
1130 goto exit;
1131 }
1132
1133 if (!tzp || !tzp->tbp)
1134 goto exit;
1135
1136 list_for_each_entry(pos, &thermal_cdev_list, node) {
1137 for (i = 0; i < tzp->num_tbps; i++) {
1138 if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
1139 continue;
1140 if (tzp->tbp[i].match(tz, pos))
1141 continue;
1142 tzp->tbp[i].cdev = pos;
1143 __bind(tz, tzp->tbp[i].trip_mask, pos,
1144 tzp->tbp[i].binding_limits,
1145 tzp->tbp[i].weight);
1146 }
1147 }
1148exit:
1149 mutex_unlock(&thermal_list_lock);
1150}
1151
1152/**
1153 * thermal_zone_device_register() - register a new thermal zone device
1154 * @type: the thermal zone device type
1155 * @trips: the number of trip points the thermal zone support
1156 * @mask: a bit string indicating the writeablility of trip points
1157 * @devdata: private device data
1158 * @ops: standard thermal zone device callbacks
1159 * @tzp: thermal zone platform parameters
1160 * @passive_delay: number of milliseconds to wait between polls when
1161 * performing passive cooling
1162 * @polling_delay: number of milliseconds to wait between polls when checking
1163 * whether trip points have been crossed (0 for interrupt
1164 * driven systems)
1165 *
1166 * This interface function adds a new thermal zone device (sensor) to
1167 * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1168 * thermal cooling devices registered at the same time.
1169 * thermal_zone_device_unregister() must be called when the device is no
1170 * longer needed. The passive cooling depends on the .get_trend() return value.
1171 *
1172 * Return: a pointer to the created struct thermal_zone_device or an
1173 * in case of error, an ERR_PTR. Caller must check return value with
1174 * IS_ERR*() helpers.
1175 */
1176struct thermal_zone_device *
1177thermal_zone_device_register(const char *type, int trips, int mask,
1178 void *devdata, struct thermal_zone_device_ops *ops,
1179 struct thermal_zone_params *tzp, int passive_delay,
1180 int polling_delay)
1181{
1182 struct thermal_zone_device *tz;
1183 enum thermal_trip_type trip_type;
1184 int trip_temp;
1185 int id;
1186 int result;
1187 int count;
1188 struct thermal_governor *governor;
1189
1190 if (!type || strlen(type) == 0) {
1191 pr_err("Error: No thermal zone type defined\n");
1192 return ERR_PTR(-EINVAL);
1193 }
1194
1195 if (type && strlen(type) >= THERMAL_NAME_LENGTH) {
1196 pr_err("Error: Thermal zone name (%s) too long, should be under %d chars\n",
1197 type, THERMAL_NAME_LENGTH);
1198 return ERR_PTR(-EINVAL);
1199 }
1200
1201 if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips) {
1202 pr_err("Error: Incorrect number of thermal trips\n");
1203 return ERR_PTR(-EINVAL);
1204 }
1205
1206 if (!ops) {
1207 pr_err("Error: Thermal zone device ops not defined\n");
1208 return ERR_PTR(-EINVAL);
1209 }
1210
1211 if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1212 return ERR_PTR(-EINVAL);
1213
1214 tz = kzalloc(sizeof(*tz), GFP_KERNEL);
1215 if (!tz)
1216 return ERR_PTR(-ENOMEM);
1217
1218 INIT_LIST_HEAD(&tz->thermal_instances);
1219 ida_init(&tz->ida);
1220 mutex_init(&tz->lock);
1221 id = ida_simple_get(&thermal_tz_ida, 0, 0, GFP_KERNEL);
1222 if (id < 0) {
1223 result = id;
1224 goto free_tz;
1225 }
1226
1227 tz->id = id;
1228 strlcpy(tz->type, type, sizeof(tz->type));
1229
1230 if (!ops->critical)
1231 ops->critical = thermal_zone_device_critical;
1232
1233 tz->ops = ops;
1234 tz->tzp = tzp;
1235 tz->device.class = &thermal_class;
1236 tz->devdata = devdata;
1237 tz->trips = trips;
1238
1239 thermal_set_delay_jiffies(&tz->passive_delay_jiffies, passive_delay);
1240 thermal_set_delay_jiffies(&tz->polling_delay_jiffies, polling_delay);
1241
1242 /* sys I/F */
1243 /* Add nodes that are always present via .groups */
1244 result = thermal_zone_create_device_groups(tz, mask);
1245 if (result)
1246 goto remove_id;
1247
1248 /* A new thermal zone needs to be updated anyway. */
1249 atomic_set(&tz->need_update, 1);
1250
1251 dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1252 result = device_register(&tz->device);
1253 if (result)
1254 goto release_device;
1255
1256 for (count = 0; count < trips; count++) {
1257 if (tz->ops->get_trip_type(tz, count, &trip_type) ||
1258 tz->ops->get_trip_temp(tz, count, &trip_temp) ||
1259 !trip_temp)
1260 set_bit(count, &tz->trips_disabled);
1261 }
1262
1263 /* Update 'this' zone's governor information */
1264 mutex_lock(&thermal_governor_lock);
1265
1266 if (tz->tzp)
1267 governor = __find_governor(tz->tzp->governor_name);
1268 else
1269 governor = def_governor;
1270
1271 result = thermal_set_governor(tz, governor);
1272 if (result) {
1273 mutex_unlock(&thermal_governor_lock);
1274 goto unregister;
1275 }
1276
1277 mutex_unlock(&thermal_governor_lock);
1278
1279 if (!tz->tzp || !tz->tzp->no_hwmon) {
1280 result = thermal_add_hwmon_sysfs(tz);
1281 if (result)
1282 goto unregister;
1283 }
1284
1285 mutex_lock(&thermal_list_lock);
1286 list_add_tail(&tz->node, &thermal_tz_list);
1287 mutex_unlock(&thermal_list_lock);
1288
1289 /* Bind cooling devices for this zone */
1290 bind_tz(tz);
1291
1292 INIT_DELAYED_WORK(&tz->poll_queue, thermal_zone_device_check);
1293
1294 thermal_zone_device_init(tz);
1295 /* Update the new thermal zone and mark it as already updated. */
1296 if (atomic_cmpxchg(&tz->need_update, 1, 0))
1297 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
1298
1299 thermal_notify_tz_create(tz->id, tz->type);
1300
1301 return tz;
1302
1303unregister:
1304 device_del(&tz->device);
1305release_device:
1306 put_device(&tz->device);
1307 tz = NULL;
1308remove_id:
1309 ida_simple_remove(&thermal_tz_ida, id);
1310free_tz:
1311 kfree(tz);
1312 return ERR_PTR(result);
1313}
1314EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1315
1316/**
1317 * thermal_zone_device_unregister - removes the registered thermal zone device
1318 * @tz: the thermal zone device to remove
1319 */
1320void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1321{
1322 int i, tz_id;
1323 const struct thermal_zone_params *tzp;
1324 struct thermal_cooling_device *cdev;
1325 struct thermal_zone_device *pos = NULL;
1326
1327 if (!tz)
1328 return;
1329
1330 tzp = tz->tzp;
1331 tz_id = tz->id;
1332
1333 mutex_lock(&thermal_list_lock);
1334 list_for_each_entry(pos, &thermal_tz_list, node)
1335 if (pos == tz)
1336 break;
1337 if (pos != tz) {
1338 /* thermal zone device not found */
1339 mutex_unlock(&thermal_list_lock);
1340 return;
1341 }
1342 list_del(&tz->node);
1343
1344 /* Unbind all cdevs associated with 'this' thermal zone */
1345 list_for_each_entry(cdev, &thermal_cdev_list, node) {
1346 if (tz->ops->unbind) {
1347 tz->ops->unbind(tz, cdev);
1348 continue;
1349 }
1350
1351 if (!tzp || !tzp->tbp)
1352 break;
1353
1354 for (i = 0; i < tzp->num_tbps; i++) {
1355 if (tzp->tbp[i].cdev == cdev) {
1356 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1357 tzp->tbp[i].cdev = NULL;
1358 }
1359 }
1360 }
1361
1362 mutex_unlock(&thermal_list_lock);
1363
1364 cancel_delayed_work_sync(&tz->poll_queue);
1365
1366 thermal_set_governor(tz, NULL);
1367
1368 thermal_remove_hwmon_sysfs(tz);
1369 ida_simple_remove(&thermal_tz_ida, tz->id);
1370 ida_destroy(&tz->ida);
1371 mutex_destroy(&tz->lock);
1372 device_unregister(&tz->device);
1373
1374 thermal_notify_tz_delete(tz_id);
1375}
1376EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
1377
1378/**
1379 * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1380 * @name: thermal zone name to fetch the temperature
1381 *
1382 * When only one zone is found with the passed name, returns a reference to it.
1383 *
1384 * Return: On success returns a reference to an unique thermal zone with
1385 * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1386 * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1387 */
1388struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1389{
1390 struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1391 unsigned int found = 0;
1392
1393 if (!name)
1394 goto exit;
1395
1396 mutex_lock(&thermal_list_lock);
1397 list_for_each_entry(pos, &thermal_tz_list, node)
1398 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
1399 found++;
1400 ref = pos;
1401 }
1402 mutex_unlock(&thermal_list_lock);
1403
1404 /* nothing has been found, thus an error code for it */
1405 if (found == 0)
1406 ref = ERR_PTR(-ENODEV);
1407 else if (found > 1)
1408 /* Success only when an unique zone is found */
1409 ref = ERR_PTR(-EEXIST);
1410
1411exit:
1412 return ref;
1413}
1414EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
1415
1416static int thermal_pm_notify(struct notifier_block *nb,
1417 unsigned long mode, void *_unused)
1418{
1419 struct thermal_zone_device *tz;
1420
1421 switch (mode) {
1422 case PM_HIBERNATION_PREPARE:
1423 case PM_RESTORE_PREPARE:
1424 case PM_SUSPEND_PREPARE:
1425 atomic_set(&in_suspend, 1);
1426 break;
1427 case PM_POST_HIBERNATION:
1428 case PM_POST_RESTORE:
1429 case PM_POST_SUSPEND:
1430 atomic_set(&in_suspend, 0);
1431 list_for_each_entry(tz, &thermal_tz_list, node) {
1432 if (!thermal_zone_device_is_enabled(tz))
1433 continue;
1434
1435 thermal_zone_device_init(tz);
1436 thermal_zone_device_update(tz,
1437 THERMAL_EVENT_UNSPECIFIED);
1438 }
1439 break;
1440 default:
1441 break;
1442 }
1443 return 0;
1444}
1445
1446static struct notifier_block thermal_pm_nb = {
1447 .notifier_call = thermal_pm_notify,
1448};
1449
1450static int __init thermal_init(void)
1451{
1452 int result;
1453
1454 result = thermal_netlink_init();
1455 if (result)
1456 goto error;
1457
1458 result = thermal_register_governors();
1459 if (result)
1460 goto error;
1461
1462 result = class_register(&thermal_class);
1463 if (result)
1464 goto unregister_governors;
1465
1466 result = of_parse_thermal_zones();
1467 if (result)
1468 goto unregister_class;
1469
1470 result = register_pm_notifier(&thermal_pm_nb);
1471 if (result)
1472 pr_warn("Thermal: Can not register suspend notifier, return %d\n",
1473 result);
1474
1475 return 0;
1476
1477unregister_class:
1478 class_unregister(&thermal_class);
1479unregister_governors:
1480 thermal_unregister_governors();
1481error:
1482 ida_destroy(&thermal_tz_ida);
1483 ida_destroy(&thermal_cdev_ida);
1484 mutex_destroy(&thermal_list_lock);
1485 mutex_destroy(&thermal_governor_lock);
1486 return result;
1487}
1488postcore_initcall(thermal_init);