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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/module.h>
13#include <linux/device.h>
14#include <linux/err.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 <net/netlink.h>
23#include <net/genetlink.h>
24#include <linux/suspend.h>
25
26#define CREATE_TRACE_POINTS
27#include <trace/events/thermal.h>
28
29#include "thermal_core.h"
30#include "thermal_hwmon.h"
31
32MODULE_AUTHOR("Zhang Rui");
33MODULE_DESCRIPTION("Generic thermal management sysfs support");
34MODULE_LICENSE("GPL v2");
35
36static DEFINE_IDA(thermal_tz_ida);
37static DEFINE_IDA(thermal_cdev_ida);
38
39static LIST_HEAD(thermal_tz_list);
40static LIST_HEAD(thermal_cdev_list);
41static LIST_HEAD(thermal_governor_list);
42
43static DEFINE_MUTEX(thermal_list_lock);
44static DEFINE_MUTEX(thermal_governor_lock);
45static DEFINE_MUTEX(poweroff_lock);
46
47static atomic_t in_suspend;
48static bool power_off_triggered;
49
50static struct thermal_governor *def_governor;
51
52/*
53 * Governor section: set of functions to handle thermal governors
54 *
55 * Functions to help in the life cycle of thermal governors within
56 * the thermal core and by the thermal governor code.
57 */
58
59static struct thermal_governor *__find_governor(const char *name)
60{
61 struct thermal_governor *pos;
62
63 if (!name || !name[0])
64 return def_governor;
65
66 list_for_each_entry(pos, &thermal_governor_list, governor_list)
67 if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH))
68 return pos;
69
70 return NULL;
71}
72
73/**
74 * bind_previous_governor() - bind the previous governor of the thermal zone
75 * @tz: a valid pointer to a struct thermal_zone_device
76 * @failed_gov_name: the name of the governor that failed to register
77 *
78 * Register the previous governor of the thermal zone after a new
79 * governor has failed to be bound.
80 */
81static void bind_previous_governor(struct thermal_zone_device *tz,
82 const char *failed_gov_name)
83{
84 if (tz->governor && tz->governor->bind_to_tz) {
85 if (tz->governor->bind_to_tz(tz)) {
86 dev_err(&tz->device,
87 "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n",
88 failed_gov_name, tz->governor->name, tz->type);
89 tz->governor = NULL;
90 }
91 }
92}
93
94/**
95 * thermal_set_governor() - Switch to another governor
96 * @tz: a valid pointer to a struct thermal_zone_device
97 * @new_gov: pointer to the new governor
98 *
99 * Change the governor of thermal zone @tz.
100 *
101 * Return: 0 on success, an error if the new governor's bind_to_tz() failed.
102 */
103static int thermal_set_governor(struct thermal_zone_device *tz,
104 struct thermal_governor *new_gov)
105{
106 int ret = 0;
107
108 if (tz->governor && tz->governor->unbind_from_tz)
109 tz->governor->unbind_from_tz(tz);
110
111 if (new_gov && new_gov->bind_to_tz) {
112 ret = new_gov->bind_to_tz(tz);
113 if (ret) {
114 bind_previous_governor(tz, new_gov->name);
115
116 return ret;
117 }
118 }
119
120 tz->governor = new_gov;
121
122 return ret;
123}
124
125int thermal_register_governor(struct thermal_governor *governor)
126{
127 int err;
128 const char *name;
129 struct thermal_zone_device *pos;
130
131 if (!governor)
132 return -EINVAL;
133
134 mutex_lock(&thermal_governor_lock);
135
136 err = -EBUSY;
137 if (!__find_governor(governor->name)) {
138 bool match_default;
139
140 err = 0;
141 list_add(&governor->governor_list, &thermal_governor_list);
142 match_default = !strncmp(governor->name,
143 DEFAULT_THERMAL_GOVERNOR,
144 THERMAL_NAME_LENGTH);
145
146 if (!def_governor && match_default)
147 def_governor = governor;
148 }
149
150 mutex_lock(&thermal_list_lock);
151
152 list_for_each_entry(pos, &thermal_tz_list, node) {
153 /*
154 * only thermal zones with specified tz->tzp->governor_name
155 * may run with tz->govenor unset
156 */
157 if (pos->governor)
158 continue;
159
160 name = pos->tzp->governor_name;
161
162 if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) {
163 int ret;
164
165 ret = thermal_set_governor(pos, governor);
166 if (ret)
167 dev_err(&pos->device,
168 "Failed to set governor %s for thermal zone %s: %d\n",
169 governor->name, pos->type, ret);
170 }
171 }
172
173 mutex_unlock(&thermal_list_lock);
174 mutex_unlock(&thermal_governor_lock);
175
176 return err;
177}
178
179void thermal_unregister_governor(struct thermal_governor *governor)
180{
181 struct thermal_zone_device *pos;
182
183 if (!governor)
184 return;
185
186 mutex_lock(&thermal_governor_lock);
187
188 if (!__find_governor(governor->name))
189 goto exit;
190
191 mutex_lock(&thermal_list_lock);
192
193 list_for_each_entry(pos, &thermal_tz_list, node) {
194 if (!strncasecmp(pos->governor->name, governor->name,
195 THERMAL_NAME_LENGTH))
196 thermal_set_governor(pos, NULL);
197 }
198
199 mutex_unlock(&thermal_list_lock);
200 list_del(&governor->governor_list);
201exit:
202 mutex_unlock(&thermal_governor_lock);
203}
204
205int thermal_zone_device_set_policy(struct thermal_zone_device *tz,
206 char *policy)
207{
208 struct thermal_governor *gov;
209 int ret = -EINVAL;
210
211 mutex_lock(&thermal_governor_lock);
212 mutex_lock(&tz->lock);
213
214 gov = __find_governor(strim(policy));
215 if (!gov)
216 goto exit;
217
218 ret = thermal_set_governor(tz, gov);
219
220exit:
221 mutex_unlock(&tz->lock);
222 mutex_unlock(&thermal_governor_lock);
223
224 return ret;
225}
226
227int thermal_build_list_of_policies(char *buf)
228{
229 struct thermal_governor *pos;
230 ssize_t count = 0;
231 ssize_t size = PAGE_SIZE;
232
233 mutex_lock(&thermal_governor_lock);
234
235 list_for_each_entry(pos, &thermal_governor_list, governor_list) {
236 size = PAGE_SIZE - count;
237 count += scnprintf(buf + count, size, "%s ", pos->name);
238 }
239 count += scnprintf(buf + count, size, "\n");
240
241 mutex_unlock(&thermal_governor_lock);
242
243 return count;
244}
245
246static void __init thermal_unregister_governors(void)
247{
248 struct thermal_governor **governor;
249
250 for_each_governor_table(governor)
251 thermal_unregister_governor(*governor);
252}
253
254static int __init thermal_register_governors(void)
255{
256 int ret = 0;
257 struct thermal_governor **governor;
258
259 for_each_governor_table(governor) {
260 ret = thermal_register_governor(*governor);
261 if (ret) {
262 pr_err("Failed to register governor: '%s'",
263 (*governor)->name);
264 break;
265 }
266
267 pr_info("Registered thermal governor '%s'",
268 (*governor)->name);
269 }
270
271 if (ret) {
272 struct thermal_governor **gov;
273
274 for_each_governor_table(gov) {
275 if (gov == governor)
276 break;
277 thermal_unregister_governor(*gov);
278 }
279 }
280
281 return ret;
282}
283
284/*
285 * Zone update section: main control loop applied to each zone while monitoring
286 *
287 * in polling mode. The monitoring is done using a workqueue.
288 * Same update may be done on a zone by calling thermal_zone_device_update().
289 *
290 * An update means:
291 * - Non-critical trips will invoke the governor responsible for that zone;
292 * - Hot trips will produce a notification to userspace;
293 * - Critical trip point will cause a system shutdown.
294 */
295static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
296 int delay)
297{
298 if (delay > 1000)
299 mod_delayed_work(system_freezable_power_efficient_wq,
300 &tz->poll_queue,
301 round_jiffies(msecs_to_jiffies(delay)));
302 else if (delay)
303 mod_delayed_work(system_freezable_power_efficient_wq,
304 &tz->poll_queue,
305 msecs_to_jiffies(delay));
306 else
307 cancel_delayed_work_sync(&tz->poll_queue);
308}
309
310static void monitor_thermal_zone(struct thermal_zone_device *tz)
311{
312 mutex_lock(&tz->lock);
313
314 if (tz->passive)
315 thermal_zone_device_set_polling(tz, tz->passive_delay);
316 else if (tz->polling_delay)
317 thermal_zone_device_set_polling(tz, tz->polling_delay);
318 else
319 thermal_zone_device_set_polling(tz, 0);
320
321 mutex_unlock(&tz->lock);
322}
323
324static void handle_non_critical_trips(struct thermal_zone_device *tz, int trip)
325{
326 tz->governor ? tz->governor->throttle(tz, trip) :
327 def_governor->throttle(tz, trip);
328}
329
330/**
331 * thermal_emergency_poweroff_func - emergency poweroff work after a known delay
332 * @work: work_struct associated with the emergency poweroff function
333 *
334 * This function is called in very critical situations to force
335 * a kernel poweroff after a configurable timeout value.
336 */
337static void thermal_emergency_poweroff_func(struct work_struct *work)
338{
339 /*
340 * We have reached here after the emergency thermal shutdown
341 * Waiting period has expired. This means orderly_poweroff has
342 * not been able to shut off the system for some reason.
343 * Try to shut down the system immediately using kernel_power_off
344 * if populated
345 */
346 WARN(1, "Attempting kernel_power_off: Temperature too high\n");
347 kernel_power_off();
348
349 /*
350 * Worst of the worst case trigger emergency restart
351 */
352 WARN(1, "Attempting emergency_restart: Temperature too high\n");
353 emergency_restart();
354}
355
356static DECLARE_DELAYED_WORK(thermal_emergency_poweroff_work,
357 thermal_emergency_poweroff_func);
358
359/**
360 * thermal_emergency_poweroff - Trigger an emergency system poweroff
361 *
362 * This may be called from any critical situation to trigger a system shutdown
363 * after a known period of time. By default this is not scheduled.
364 */
365static void thermal_emergency_poweroff(void)
366{
367 int poweroff_delay_ms = CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS;
368 /*
369 * poweroff_delay_ms must be a carefully profiled positive value.
370 * Its a must for thermal_emergency_poweroff_work to be scheduled
371 */
372 if (poweroff_delay_ms <= 0)
373 return;
374 schedule_delayed_work(&thermal_emergency_poweroff_work,
375 msecs_to_jiffies(poweroff_delay_ms));
376}
377
378static void handle_critical_trips(struct thermal_zone_device *tz,
379 int trip, enum thermal_trip_type trip_type)
380{
381 int trip_temp;
382
383 tz->ops->get_trip_temp(tz, trip, &trip_temp);
384
385 /* If we have not crossed the trip_temp, we do not care. */
386 if (trip_temp <= 0 || tz->temperature < trip_temp)
387 return;
388
389 trace_thermal_zone_trip(tz, trip, trip_type);
390
391 if (tz->ops->notify)
392 tz->ops->notify(tz, trip, trip_type);
393
394 if (trip_type == THERMAL_TRIP_CRITICAL) {
395 dev_emerg(&tz->device,
396 "critical temperature reached (%d C), shutting down\n",
397 tz->temperature / 1000);
398 mutex_lock(&poweroff_lock);
399 if (!power_off_triggered) {
400 /*
401 * Queue a backup emergency shutdown in the event of
402 * orderly_poweroff failure
403 */
404 thermal_emergency_poweroff();
405 orderly_poweroff(true);
406 power_off_triggered = true;
407 }
408 mutex_unlock(&poweroff_lock);
409 }
410}
411
412static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
413{
414 enum thermal_trip_type type;
415
416 /* Ignore disabled trip points */
417 if (test_bit(trip, &tz->trips_disabled))
418 return;
419
420 tz->ops->get_trip_type(tz, trip, &type);
421
422 if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
423 handle_critical_trips(tz, trip, type);
424 else
425 handle_non_critical_trips(tz, trip);
426 /*
427 * Alright, we handled this trip successfully.
428 * So, start monitoring again.
429 */
430 monitor_thermal_zone(tz);
431}
432
433static void update_temperature(struct thermal_zone_device *tz)
434{
435 int temp, ret;
436
437 ret = thermal_zone_get_temp(tz, &temp);
438 if (ret) {
439 if (ret != -EAGAIN)
440 dev_warn(&tz->device,
441 "failed to read out thermal zone (%d)\n",
442 ret);
443 return;
444 }
445
446 mutex_lock(&tz->lock);
447 tz->last_temperature = tz->temperature;
448 tz->temperature = temp;
449 mutex_unlock(&tz->lock);
450
451 trace_thermal_temperature(tz);
452 if (tz->last_temperature == THERMAL_TEMP_INVALID)
453 dev_dbg(&tz->device, "last_temperature N/A, current_temperature=%d\n",
454 tz->temperature);
455 else
456 dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
457 tz->last_temperature, tz->temperature);
458}
459
460static void thermal_zone_device_init(struct thermal_zone_device *tz)
461{
462 struct thermal_instance *pos;
463 tz->temperature = THERMAL_TEMP_INVALID;
464 list_for_each_entry(pos, &tz->thermal_instances, tz_node)
465 pos->initialized = false;
466}
467
468static void thermal_zone_device_reset(struct thermal_zone_device *tz)
469{
470 tz->passive = 0;
471 thermal_zone_device_init(tz);
472}
473
474void thermal_zone_device_update(struct thermal_zone_device *tz,
475 enum thermal_notify_event event)
476{
477 int count;
478
479 if (atomic_read(&in_suspend))
480 return;
481
482 if (!tz->ops->get_temp)
483 return;
484
485 update_temperature(tz);
486
487 thermal_zone_set_trips(tz);
488
489 tz->notify_event = event;
490
491 for (count = 0; count < tz->trips; count++)
492 handle_thermal_trip(tz, count);
493}
494EXPORT_SYMBOL_GPL(thermal_zone_device_update);
495
496/**
497 * thermal_notify_framework - Sensor drivers use this API to notify framework
498 * @tz: thermal zone device
499 * @trip: indicates which trip point has been crossed
500 *
501 * This function handles the trip events from sensor drivers. It starts
502 * throttling the cooling devices according to the policy configured.
503 * For CRITICAL and HOT trip points, this notifies the respective drivers,
504 * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
505 * The throttling policy is based on the configured platform data; if no
506 * platform data is provided, this uses the step_wise throttling policy.
507 */
508void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
509{
510 handle_thermal_trip(tz, trip);
511}
512EXPORT_SYMBOL_GPL(thermal_notify_framework);
513
514static void thermal_zone_device_check(struct work_struct *work)
515{
516 struct thermal_zone_device *tz = container_of(work, struct
517 thermal_zone_device,
518 poll_queue.work);
519 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
520}
521
522/*
523 * Power actor section: interface to power actors to estimate power
524 *
525 * Set of functions used to interact to cooling devices that know
526 * how to estimate their devices power consumption.
527 */
528
529/**
530 * power_actor_get_max_power() - get the maximum power that a cdev can consume
531 * @cdev: pointer to &thermal_cooling_device
532 * @tz: a valid thermal zone device pointer
533 * @max_power: pointer in which to store the maximum power
534 *
535 * Calculate the maximum power consumption in milliwats that the
536 * cooling device can currently consume and store it in @max_power.
537 *
538 * Return: 0 on success, -EINVAL if @cdev doesn't support the
539 * power_actor API or -E* on other error.
540 */
541int power_actor_get_max_power(struct thermal_cooling_device *cdev,
542 struct thermal_zone_device *tz, u32 *max_power)
543{
544 if (!cdev_is_power_actor(cdev))
545 return -EINVAL;
546
547 return cdev->ops->state2power(cdev, tz, 0, max_power);
548}
549
550/**
551 * power_actor_get_min_power() - get the mainimum power that a cdev can consume
552 * @cdev: pointer to &thermal_cooling_device
553 * @tz: a valid thermal zone device pointer
554 * @min_power: pointer in which to store the minimum power
555 *
556 * Calculate the minimum power consumption in milliwatts that the
557 * cooling device can currently consume and store it in @min_power.
558 *
559 * Return: 0 on success, -EINVAL if @cdev doesn't support the
560 * power_actor API or -E* on other error.
561 */
562int power_actor_get_min_power(struct thermal_cooling_device *cdev,
563 struct thermal_zone_device *tz, u32 *min_power)
564{
565 unsigned long max_state;
566 int ret;
567
568 if (!cdev_is_power_actor(cdev))
569 return -EINVAL;
570
571 ret = cdev->ops->get_max_state(cdev, &max_state);
572 if (ret)
573 return ret;
574
575 return cdev->ops->state2power(cdev, tz, max_state, min_power);
576}
577
578/**
579 * power_actor_set_power() - limit the maximum power a cooling device consumes
580 * @cdev: pointer to &thermal_cooling_device
581 * @instance: thermal instance to update
582 * @power: the power in milliwatts
583 *
584 * Set the cooling device to consume at most @power milliwatts. The limit is
585 * expected to be a cap at the maximum power consumption.
586 *
587 * Return: 0 on success, -EINVAL if the cooling device does not
588 * implement the power actor API or -E* for other failures.
589 */
590int power_actor_set_power(struct thermal_cooling_device *cdev,
591 struct thermal_instance *instance, u32 power)
592{
593 unsigned long state;
594 int ret;
595
596 if (!cdev_is_power_actor(cdev))
597 return -EINVAL;
598
599 ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
600 if (ret)
601 return ret;
602
603 instance->target = state;
604 mutex_lock(&cdev->lock);
605 cdev->updated = false;
606 mutex_unlock(&cdev->lock);
607 thermal_cdev_update(cdev);
608
609 return 0;
610}
611
612void thermal_zone_device_rebind_exception(struct thermal_zone_device *tz,
613 const char *cdev_type, size_t size)
614{
615 struct thermal_cooling_device *cdev = NULL;
616
617 mutex_lock(&thermal_list_lock);
618 list_for_each_entry(cdev, &thermal_cdev_list, node) {
619 /* skip non matching cdevs */
620 if (strncmp(cdev_type, cdev->type, size))
621 continue;
622
623 /* re binding the exception matching the type pattern */
624 thermal_zone_bind_cooling_device(tz, THERMAL_TRIPS_NONE, cdev,
625 THERMAL_NO_LIMIT,
626 THERMAL_NO_LIMIT,
627 THERMAL_WEIGHT_DEFAULT);
628 }
629 mutex_unlock(&thermal_list_lock);
630}
631
632void thermal_zone_device_unbind_exception(struct thermal_zone_device *tz,
633 const char *cdev_type, size_t size)
634{
635 struct thermal_cooling_device *cdev = NULL;
636
637 mutex_lock(&thermal_list_lock);
638 list_for_each_entry(cdev, &thermal_cdev_list, node) {
639 /* skip non matching cdevs */
640 if (strncmp(cdev_type, cdev->type, size))
641 continue;
642 /* unbinding the exception matching the type pattern */
643 thermal_zone_unbind_cooling_device(tz, THERMAL_TRIPS_NONE,
644 cdev);
645 }
646 mutex_unlock(&thermal_list_lock);
647}
648
649/*
650 * Device management section: cooling devices, zones devices, and binding
651 *
652 * Set of functions provided by the thermal core for:
653 * - cooling devices lifecycle: registration, unregistration,
654 * binding, and unbinding.
655 * - thermal zone devices lifecycle: registration, unregistration,
656 * binding, and unbinding.
657 */
658
659/**
660 * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
661 * @tz: pointer to struct thermal_zone_device
662 * @trip: indicates which trip point the cooling devices is
663 * associated with in this thermal zone.
664 * @cdev: pointer to struct thermal_cooling_device
665 * @upper: the Maximum cooling state for this trip point.
666 * THERMAL_NO_LIMIT means no upper limit,
667 * and the cooling device can be in max_state.
668 * @lower: the Minimum cooling state can be used for this trip point.
669 * THERMAL_NO_LIMIT means no lower limit,
670 * and the cooling device can be in cooling state 0.
671 * @weight: The weight of the cooling device to be bound to the
672 * thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
673 * default value
674 *
675 * This interface function bind a thermal cooling device to the certain trip
676 * point of a thermal zone device.
677 * This function is usually called in the thermal zone device .bind callback.
678 *
679 * Return: 0 on success, the proper error value otherwise.
680 */
681int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
682 int trip,
683 struct thermal_cooling_device *cdev,
684 unsigned long upper, unsigned long lower,
685 unsigned int weight)
686{
687 struct thermal_instance *dev;
688 struct thermal_instance *pos;
689 struct thermal_zone_device *pos1;
690 struct thermal_cooling_device *pos2;
691 unsigned long max_state;
692 int result, ret;
693
694 if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
695 return -EINVAL;
696
697 list_for_each_entry(pos1, &thermal_tz_list, node) {
698 if (pos1 == tz)
699 break;
700 }
701 list_for_each_entry(pos2, &thermal_cdev_list, node) {
702 if (pos2 == cdev)
703 break;
704 }
705
706 if (tz != pos1 || cdev != pos2)
707 return -EINVAL;
708
709 ret = cdev->ops->get_max_state(cdev, &max_state);
710 if (ret)
711 return ret;
712
713 /* lower default 0, upper default max_state */
714 lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
715 upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
716
717 if (lower > upper || upper > max_state)
718 return -EINVAL;
719
720 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
721 if (!dev)
722 return -ENOMEM;
723 dev->tz = tz;
724 dev->cdev = cdev;
725 dev->trip = trip;
726 dev->upper = upper;
727 dev->lower = lower;
728 dev->target = THERMAL_NO_TARGET;
729 dev->weight = weight;
730
731 result = ida_simple_get(&tz->ida, 0, 0, GFP_KERNEL);
732 if (result < 0)
733 goto free_mem;
734
735 dev->id = result;
736 sprintf(dev->name, "cdev%d", dev->id);
737 result =
738 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
739 if (result)
740 goto release_ida;
741
742 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
743 sysfs_attr_init(&dev->attr.attr);
744 dev->attr.attr.name = dev->attr_name;
745 dev->attr.attr.mode = 0444;
746 dev->attr.show = trip_point_show;
747 result = device_create_file(&tz->device, &dev->attr);
748 if (result)
749 goto remove_symbol_link;
750
751 sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
752 sysfs_attr_init(&dev->weight_attr.attr);
753 dev->weight_attr.attr.name = dev->weight_attr_name;
754 dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
755 dev->weight_attr.show = weight_show;
756 dev->weight_attr.store = weight_store;
757 result = device_create_file(&tz->device, &dev->weight_attr);
758 if (result)
759 goto remove_trip_file;
760
761 mutex_lock(&tz->lock);
762 mutex_lock(&cdev->lock);
763 list_for_each_entry(pos, &tz->thermal_instances, tz_node)
764 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
765 result = -EEXIST;
766 break;
767 }
768 if (!result) {
769 list_add_tail(&dev->tz_node, &tz->thermal_instances);
770 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
771 atomic_set(&tz->need_update, 1);
772 }
773 mutex_unlock(&cdev->lock);
774 mutex_unlock(&tz->lock);
775
776 if (!result)
777 return 0;
778
779 device_remove_file(&tz->device, &dev->weight_attr);
780remove_trip_file:
781 device_remove_file(&tz->device, &dev->attr);
782remove_symbol_link:
783 sysfs_remove_link(&tz->device.kobj, dev->name);
784release_ida:
785 ida_simple_remove(&tz->ida, dev->id);
786free_mem:
787 kfree(dev);
788 return result;
789}
790EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
791
792/**
793 * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
794 * thermal zone.
795 * @tz: pointer to a struct thermal_zone_device.
796 * @trip: indicates which trip point the cooling devices is
797 * associated with in this thermal zone.
798 * @cdev: pointer to a struct thermal_cooling_device.
799 *
800 * This interface function unbind a thermal cooling device from the certain
801 * trip point of a thermal zone device.
802 * This function is usually called in the thermal zone device .unbind callback.
803 *
804 * Return: 0 on success, the proper error value otherwise.
805 */
806int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
807 int trip,
808 struct thermal_cooling_device *cdev)
809{
810 struct thermal_instance *pos, *next;
811
812 mutex_lock(&tz->lock);
813 mutex_lock(&cdev->lock);
814 list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
815 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
816 list_del(&pos->tz_node);
817 list_del(&pos->cdev_node);
818 mutex_unlock(&cdev->lock);
819 mutex_unlock(&tz->lock);
820 goto unbind;
821 }
822 }
823 mutex_unlock(&cdev->lock);
824 mutex_unlock(&tz->lock);
825
826 return -ENODEV;
827
828unbind:
829 device_remove_file(&tz->device, &pos->weight_attr);
830 device_remove_file(&tz->device, &pos->attr);
831 sysfs_remove_link(&tz->device.kobj, pos->name);
832 ida_simple_remove(&tz->ida, pos->id);
833 kfree(pos);
834 return 0;
835}
836EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
837
838static void thermal_release(struct device *dev)
839{
840 struct thermal_zone_device *tz;
841 struct thermal_cooling_device *cdev;
842
843 if (!strncmp(dev_name(dev), "thermal_zone",
844 sizeof("thermal_zone") - 1)) {
845 tz = to_thermal_zone(dev);
846 thermal_zone_destroy_device_groups(tz);
847 kfree(tz);
848 } else if (!strncmp(dev_name(dev), "cooling_device",
849 sizeof("cooling_device") - 1)) {
850 cdev = to_cooling_device(dev);
851 kfree(cdev);
852 }
853}
854
855static struct class thermal_class = {
856 .name = "thermal",
857 .dev_release = thermal_release,
858};
859
860static inline
861void print_bind_err_msg(struct thermal_zone_device *tz,
862 struct thermal_cooling_device *cdev, int ret)
863{
864 dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
865 tz->type, cdev->type, ret);
866}
867
868static void __bind(struct thermal_zone_device *tz, int mask,
869 struct thermal_cooling_device *cdev,
870 unsigned long *limits,
871 unsigned int weight)
872{
873 int i, ret;
874
875 for (i = 0; i < tz->trips; i++) {
876 if (mask & (1 << i)) {
877 unsigned long upper, lower;
878
879 upper = THERMAL_NO_LIMIT;
880 lower = THERMAL_NO_LIMIT;
881 if (limits) {
882 lower = limits[i * 2];
883 upper = limits[i * 2 + 1];
884 }
885 ret = thermal_zone_bind_cooling_device(tz, i, cdev,
886 upper, lower,
887 weight);
888 if (ret)
889 print_bind_err_msg(tz, cdev, ret);
890 }
891 }
892}
893
894static void bind_cdev(struct thermal_cooling_device *cdev)
895{
896 int i, ret;
897 const struct thermal_zone_params *tzp;
898 struct thermal_zone_device *pos = NULL;
899
900 mutex_lock(&thermal_list_lock);
901
902 list_for_each_entry(pos, &thermal_tz_list, node) {
903 if (!pos->tzp && !pos->ops->bind)
904 continue;
905
906 if (pos->ops->bind) {
907 ret = pos->ops->bind(pos, cdev);
908 if (ret)
909 print_bind_err_msg(pos, cdev, ret);
910 continue;
911 }
912
913 tzp = pos->tzp;
914 if (!tzp || !tzp->tbp)
915 continue;
916
917 for (i = 0; i < tzp->num_tbps; i++) {
918 if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
919 continue;
920 if (tzp->tbp[i].match(pos, cdev))
921 continue;
922 tzp->tbp[i].cdev = cdev;
923 __bind(pos, tzp->tbp[i].trip_mask, cdev,
924 tzp->tbp[i].binding_limits,
925 tzp->tbp[i].weight);
926 }
927 }
928
929 mutex_unlock(&thermal_list_lock);
930}
931
932/**
933 * __thermal_cooling_device_register() - register a new thermal cooling device
934 * @np: a pointer to a device tree node.
935 * @type: the thermal cooling device type.
936 * @devdata: device private data.
937 * @ops: standard thermal cooling devices callbacks.
938 *
939 * This interface function adds a new thermal cooling device (fan/processor/...)
940 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
941 * to all the thermal zone devices registered at the same time.
942 * It also gives the opportunity to link the cooling device to a device tree
943 * node, so that it can be bound to a thermal zone created out of device tree.
944 *
945 * Return: a pointer to the created struct thermal_cooling_device or an
946 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
947 */
948static struct thermal_cooling_device *
949__thermal_cooling_device_register(struct device_node *np,
950 const char *type, void *devdata,
951 const struct thermal_cooling_device_ops *ops)
952{
953 struct thermal_cooling_device *cdev;
954 struct thermal_zone_device *pos = NULL;
955 int result;
956
957 if (type && strlen(type) >= THERMAL_NAME_LENGTH)
958 return ERR_PTR(-EINVAL);
959
960 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
961 !ops->set_cur_state)
962 return ERR_PTR(-EINVAL);
963
964 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
965 if (!cdev)
966 return ERR_PTR(-ENOMEM);
967
968 result = ida_simple_get(&thermal_cdev_ida, 0, 0, GFP_KERNEL);
969 if (result < 0) {
970 kfree(cdev);
971 return ERR_PTR(result);
972 }
973
974 cdev->id = result;
975 strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
976 mutex_init(&cdev->lock);
977 INIT_LIST_HEAD(&cdev->thermal_instances);
978 cdev->np = np;
979 cdev->ops = ops;
980 cdev->updated = false;
981 cdev->device.class = &thermal_class;
982 cdev->devdata = devdata;
983 thermal_cooling_device_setup_sysfs(cdev);
984 dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
985 result = device_register(&cdev->device);
986 if (result) {
987 ida_simple_remove(&thermal_cdev_ida, cdev->id);
988 put_device(&cdev->device);
989 return ERR_PTR(result);
990 }
991
992 /* Add 'this' new cdev to the global cdev list */
993 mutex_lock(&thermal_list_lock);
994 list_add(&cdev->node, &thermal_cdev_list);
995 mutex_unlock(&thermal_list_lock);
996
997 /* Update binding information for 'this' new cdev */
998 bind_cdev(cdev);
999
1000 mutex_lock(&thermal_list_lock);
1001 list_for_each_entry(pos, &thermal_tz_list, node)
1002 if (atomic_cmpxchg(&pos->need_update, 1, 0))
1003 thermal_zone_device_update(pos,
1004 THERMAL_EVENT_UNSPECIFIED);
1005 mutex_unlock(&thermal_list_lock);
1006
1007 return cdev;
1008}
1009
1010/**
1011 * thermal_cooling_device_register() - register a new thermal cooling device
1012 * @type: the thermal cooling device type.
1013 * @devdata: device private data.
1014 * @ops: standard thermal cooling devices callbacks.
1015 *
1016 * This interface function adds a new thermal cooling device (fan/processor/...)
1017 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1018 * to all the thermal zone devices registered at the same time.
1019 *
1020 * Return: a pointer to the created struct thermal_cooling_device or an
1021 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1022 */
1023struct thermal_cooling_device *
1024thermal_cooling_device_register(const char *type, void *devdata,
1025 const struct thermal_cooling_device_ops *ops)
1026{
1027 return __thermal_cooling_device_register(NULL, type, devdata, ops);
1028}
1029EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1030
1031/**
1032 * thermal_of_cooling_device_register() - register an OF thermal cooling device
1033 * @np: a pointer to a device tree node.
1034 * @type: the thermal cooling device type.
1035 * @devdata: device private data.
1036 * @ops: standard thermal cooling devices callbacks.
1037 *
1038 * This function will register a cooling device with device tree node reference.
1039 * This interface function adds a new thermal cooling device (fan/processor/...)
1040 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1041 * to all the thermal zone devices registered at the same time.
1042 *
1043 * Return: a pointer to the created struct thermal_cooling_device or an
1044 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1045 */
1046struct thermal_cooling_device *
1047thermal_of_cooling_device_register(struct device_node *np,
1048 const char *type, void *devdata,
1049 const struct thermal_cooling_device_ops *ops)
1050{
1051 return __thermal_cooling_device_register(np, type, devdata, ops);
1052}
1053EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1054
1055static void thermal_cooling_device_release(struct device *dev, void *res)
1056{
1057 thermal_cooling_device_unregister(
1058 *(struct thermal_cooling_device **)res);
1059}
1060
1061/**
1062 * devm_thermal_of_cooling_device_register() - register an OF thermal cooling
1063 * device
1064 * @dev: a valid struct device pointer of a sensor device.
1065 * @np: a pointer to a device tree node.
1066 * @type: the thermal cooling device type.
1067 * @devdata: device private data.
1068 * @ops: standard thermal cooling devices callbacks.
1069 *
1070 * This function will register a cooling device with device tree node reference.
1071 * This interface function adds a new thermal cooling device (fan/processor/...)
1072 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1073 * to all the thermal zone devices registered at the same time.
1074 *
1075 * Return: a pointer to the created struct thermal_cooling_device or an
1076 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1077 */
1078struct thermal_cooling_device *
1079devm_thermal_of_cooling_device_register(struct device *dev,
1080 struct device_node *np,
1081 char *type, void *devdata,
1082 const struct thermal_cooling_device_ops *ops)
1083{
1084 struct thermal_cooling_device **ptr, *tcd;
1085
1086 ptr = devres_alloc(thermal_cooling_device_release, sizeof(*ptr),
1087 GFP_KERNEL);
1088 if (!ptr)
1089 return ERR_PTR(-ENOMEM);
1090
1091 tcd = __thermal_cooling_device_register(np, type, devdata, ops);
1092 if (IS_ERR(tcd)) {
1093 devres_free(ptr);
1094 return tcd;
1095 }
1096
1097 *ptr = tcd;
1098 devres_add(dev, ptr);
1099
1100 return tcd;
1101}
1102EXPORT_SYMBOL_GPL(devm_thermal_of_cooling_device_register);
1103
1104static void __unbind(struct thermal_zone_device *tz, int mask,
1105 struct thermal_cooling_device *cdev)
1106{
1107 int i;
1108
1109 for (i = 0; i < tz->trips; i++)
1110 if (mask & (1 << i))
1111 thermal_zone_unbind_cooling_device(tz, i, cdev);
1112}
1113
1114/**
1115 * thermal_cooling_device_unregister - removes a thermal cooling device
1116 * @cdev: the thermal cooling device to remove.
1117 *
1118 * thermal_cooling_device_unregister() must be called when a registered
1119 * thermal cooling device is no longer needed.
1120 */
1121void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1122{
1123 int i;
1124 const struct thermal_zone_params *tzp;
1125 struct thermal_zone_device *tz;
1126 struct thermal_cooling_device *pos = NULL;
1127
1128 if (!cdev)
1129 return;
1130
1131 mutex_lock(&thermal_list_lock);
1132 list_for_each_entry(pos, &thermal_cdev_list, node)
1133 if (pos == cdev)
1134 break;
1135 if (pos != cdev) {
1136 /* thermal cooling device not found */
1137 mutex_unlock(&thermal_list_lock);
1138 return;
1139 }
1140 list_del(&cdev->node);
1141
1142 /* Unbind all thermal zones associated with 'this' cdev */
1143 list_for_each_entry(tz, &thermal_tz_list, node) {
1144 if (tz->ops->unbind) {
1145 tz->ops->unbind(tz, cdev);
1146 continue;
1147 }
1148
1149 if (!tz->tzp || !tz->tzp->tbp)
1150 continue;
1151
1152 tzp = tz->tzp;
1153 for (i = 0; i < tzp->num_tbps; i++) {
1154 if (tzp->tbp[i].cdev == cdev) {
1155 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1156 tzp->tbp[i].cdev = NULL;
1157 }
1158 }
1159 }
1160
1161 mutex_unlock(&thermal_list_lock);
1162
1163 ida_simple_remove(&thermal_cdev_ida, cdev->id);
1164 device_del(&cdev->device);
1165 thermal_cooling_device_destroy_sysfs(cdev);
1166 put_device(&cdev->device);
1167}
1168EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1169
1170static void bind_tz(struct thermal_zone_device *tz)
1171{
1172 int i, ret;
1173 struct thermal_cooling_device *pos = NULL;
1174 const struct thermal_zone_params *tzp = tz->tzp;
1175
1176 if (!tzp && !tz->ops->bind)
1177 return;
1178
1179 mutex_lock(&thermal_list_lock);
1180
1181 /* If there is ops->bind, try to use ops->bind */
1182 if (tz->ops->bind) {
1183 list_for_each_entry(pos, &thermal_cdev_list, node) {
1184 ret = tz->ops->bind(tz, pos);
1185 if (ret)
1186 print_bind_err_msg(tz, pos, ret);
1187 }
1188 goto exit;
1189 }
1190
1191 if (!tzp || !tzp->tbp)
1192 goto exit;
1193
1194 list_for_each_entry(pos, &thermal_cdev_list, node) {
1195 for (i = 0; i < tzp->num_tbps; i++) {
1196 if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
1197 continue;
1198 if (tzp->tbp[i].match(tz, pos))
1199 continue;
1200 tzp->tbp[i].cdev = pos;
1201 __bind(tz, tzp->tbp[i].trip_mask, pos,
1202 tzp->tbp[i].binding_limits,
1203 tzp->tbp[i].weight);
1204 }
1205 }
1206exit:
1207 mutex_unlock(&thermal_list_lock);
1208}
1209
1210/**
1211 * thermal_zone_device_register() - register a new thermal zone device
1212 * @type: the thermal zone device type
1213 * @trips: the number of trip points the thermal zone support
1214 * @mask: a bit string indicating the writeablility of trip points
1215 * @devdata: private device data
1216 * @ops: standard thermal zone device callbacks
1217 * @tzp: thermal zone platform parameters
1218 * @passive_delay: number of milliseconds to wait between polls when
1219 * performing passive cooling
1220 * @polling_delay: number of milliseconds to wait between polls when checking
1221 * whether trip points have been crossed (0 for interrupt
1222 * driven systems)
1223 *
1224 * This interface function adds a new thermal zone device (sensor) to
1225 * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1226 * thermal cooling devices registered at the same time.
1227 * thermal_zone_device_unregister() must be called when the device is no
1228 * longer needed. The passive cooling depends on the .get_trend() return value.
1229 *
1230 * Return: a pointer to the created struct thermal_zone_device or an
1231 * in case of error, an ERR_PTR. Caller must check return value with
1232 * IS_ERR*() helpers.
1233 */
1234struct thermal_zone_device *
1235thermal_zone_device_register(const char *type, int trips, int mask,
1236 void *devdata, struct thermal_zone_device_ops *ops,
1237 struct thermal_zone_params *tzp, int passive_delay,
1238 int polling_delay)
1239{
1240 struct thermal_zone_device *tz;
1241 enum thermal_trip_type trip_type;
1242 int trip_temp;
1243 int id;
1244 int result;
1245 int count;
1246 struct thermal_governor *governor;
1247
1248 if (!type || strlen(type) == 0) {
1249 pr_err("Error: No thermal zone type defined\n");
1250 return ERR_PTR(-EINVAL);
1251 }
1252
1253 if (type && strlen(type) >= THERMAL_NAME_LENGTH) {
1254 pr_err("Error: Thermal zone name (%s) too long, should be under %d chars\n",
1255 type, THERMAL_NAME_LENGTH);
1256 return ERR_PTR(-EINVAL);
1257 }
1258
1259 if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips) {
1260 pr_err("Error: Incorrect number of thermal trips\n");
1261 return ERR_PTR(-EINVAL);
1262 }
1263
1264 if (!ops) {
1265 pr_err("Error: Thermal zone device ops not defined\n");
1266 return ERR_PTR(-EINVAL);
1267 }
1268
1269 if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1270 return ERR_PTR(-EINVAL);
1271
1272 tz = kzalloc(sizeof(*tz), GFP_KERNEL);
1273 if (!tz)
1274 return ERR_PTR(-ENOMEM);
1275
1276 INIT_LIST_HEAD(&tz->thermal_instances);
1277 ida_init(&tz->ida);
1278 mutex_init(&tz->lock);
1279 id = ida_simple_get(&thermal_tz_ida, 0, 0, GFP_KERNEL);
1280 if (id < 0) {
1281 result = id;
1282 goto free_tz;
1283 }
1284
1285 tz->id = id;
1286 strlcpy(tz->type, type, sizeof(tz->type));
1287 tz->ops = ops;
1288 tz->tzp = tzp;
1289 tz->device.class = &thermal_class;
1290 tz->devdata = devdata;
1291 tz->trips = trips;
1292 tz->passive_delay = passive_delay;
1293 tz->polling_delay = polling_delay;
1294
1295 /* sys I/F */
1296 /* Add nodes that are always present via .groups */
1297 result = thermal_zone_create_device_groups(tz, mask);
1298 if (result)
1299 goto remove_id;
1300
1301 /* A new thermal zone needs to be updated anyway. */
1302 atomic_set(&tz->need_update, 1);
1303
1304 dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1305 result = device_register(&tz->device);
1306 if (result)
1307 goto release_device;
1308
1309 for (count = 0; count < trips; count++) {
1310 if (tz->ops->get_trip_type(tz, count, &trip_type))
1311 set_bit(count, &tz->trips_disabled);
1312 if (tz->ops->get_trip_temp(tz, count, &trip_temp))
1313 set_bit(count, &tz->trips_disabled);
1314 /* Check for bogus trip points */
1315 if (trip_temp == 0)
1316 set_bit(count, &tz->trips_disabled);
1317 }
1318
1319 /* Update 'this' zone's governor information */
1320 mutex_lock(&thermal_governor_lock);
1321
1322 if (tz->tzp)
1323 governor = __find_governor(tz->tzp->governor_name);
1324 else
1325 governor = def_governor;
1326
1327 result = thermal_set_governor(tz, governor);
1328 if (result) {
1329 mutex_unlock(&thermal_governor_lock);
1330 goto unregister;
1331 }
1332
1333 mutex_unlock(&thermal_governor_lock);
1334
1335 if (!tz->tzp || !tz->tzp->no_hwmon) {
1336 result = thermal_add_hwmon_sysfs(tz);
1337 if (result)
1338 goto unregister;
1339 }
1340
1341 mutex_lock(&thermal_list_lock);
1342 list_add_tail(&tz->node, &thermal_tz_list);
1343 mutex_unlock(&thermal_list_lock);
1344
1345 /* Bind cooling devices for this zone */
1346 bind_tz(tz);
1347
1348 INIT_DELAYED_WORK(&tz->poll_queue, thermal_zone_device_check);
1349
1350 thermal_zone_device_reset(tz);
1351 /* Update the new thermal zone and mark it as already updated. */
1352 if (atomic_cmpxchg(&tz->need_update, 1, 0))
1353 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
1354
1355 return tz;
1356
1357unregister:
1358 device_del(&tz->device);
1359release_device:
1360 put_device(&tz->device);
1361 tz = NULL;
1362remove_id:
1363 ida_simple_remove(&thermal_tz_ida, id);
1364free_tz:
1365 kfree(tz);
1366 return ERR_PTR(result);
1367}
1368EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1369
1370/**
1371 * thermal_device_unregister - removes the registered thermal zone device
1372 * @tz: the thermal zone device to remove
1373 */
1374void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1375{
1376 int i;
1377 const struct thermal_zone_params *tzp;
1378 struct thermal_cooling_device *cdev;
1379 struct thermal_zone_device *pos = NULL;
1380
1381 if (!tz)
1382 return;
1383
1384 tzp = tz->tzp;
1385
1386 mutex_lock(&thermal_list_lock);
1387 list_for_each_entry(pos, &thermal_tz_list, node)
1388 if (pos == tz)
1389 break;
1390 if (pos != tz) {
1391 /* thermal zone device not found */
1392 mutex_unlock(&thermal_list_lock);
1393 return;
1394 }
1395 list_del(&tz->node);
1396
1397 /* Unbind all cdevs associated with 'this' thermal zone */
1398 list_for_each_entry(cdev, &thermal_cdev_list, node) {
1399 if (tz->ops->unbind) {
1400 tz->ops->unbind(tz, cdev);
1401 continue;
1402 }
1403
1404 if (!tzp || !tzp->tbp)
1405 break;
1406
1407 for (i = 0; i < tzp->num_tbps; i++) {
1408 if (tzp->tbp[i].cdev == cdev) {
1409 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1410 tzp->tbp[i].cdev = NULL;
1411 }
1412 }
1413 }
1414
1415 mutex_unlock(&thermal_list_lock);
1416
1417 thermal_zone_device_set_polling(tz, 0);
1418
1419 thermal_set_governor(tz, NULL);
1420
1421 thermal_remove_hwmon_sysfs(tz);
1422 ida_simple_remove(&thermal_tz_ida, tz->id);
1423 ida_destroy(&tz->ida);
1424 mutex_destroy(&tz->lock);
1425 device_unregister(&tz->device);
1426}
1427EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
1428
1429/**
1430 * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1431 * @name: thermal zone name to fetch the temperature
1432 *
1433 * When only one zone is found with the passed name, returns a reference to it.
1434 *
1435 * Return: On success returns a reference to an unique thermal zone with
1436 * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1437 * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1438 */
1439struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1440{
1441 struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1442 unsigned int found = 0;
1443
1444 if (!name)
1445 goto exit;
1446
1447 mutex_lock(&thermal_list_lock);
1448 list_for_each_entry(pos, &thermal_tz_list, node)
1449 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
1450 found++;
1451 ref = pos;
1452 }
1453 mutex_unlock(&thermal_list_lock);
1454
1455 /* nothing has been found, thus an error code for it */
1456 if (found == 0)
1457 ref = ERR_PTR(-ENODEV);
1458 else if (found > 1)
1459 /* Success only when an unique zone is found */
1460 ref = ERR_PTR(-EEXIST);
1461
1462exit:
1463 return ref;
1464}
1465EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
1466
1467#ifdef CONFIG_NET
1468static const struct genl_multicast_group thermal_event_mcgrps[] = {
1469 { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
1470};
1471
1472static struct genl_family thermal_event_genl_family __ro_after_init = {
1473 .module = THIS_MODULE,
1474 .name = THERMAL_GENL_FAMILY_NAME,
1475 .version = THERMAL_GENL_VERSION,
1476 .maxattr = THERMAL_GENL_ATTR_MAX,
1477 .mcgrps = thermal_event_mcgrps,
1478 .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
1479};
1480
1481int thermal_generate_netlink_event(struct thermal_zone_device *tz,
1482 enum events event)
1483{
1484 struct sk_buff *skb;
1485 struct nlattr *attr;
1486 struct thermal_genl_event *thermal_event;
1487 void *msg_header;
1488 int size;
1489 int result;
1490 static unsigned int thermal_event_seqnum;
1491
1492 if (!tz)
1493 return -EINVAL;
1494
1495 /* allocate memory */
1496 size = nla_total_size(sizeof(struct thermal_genl_event)) +
1497 nla_total_size(0);
1498
1499 skb = genlmsg_new(size, GFP_ATOMIC);
1500 if (!skb)
1501 return -ENOMEM;
1502
1503 /* add the genetlink message header */
1504 msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1505 &thermal_event_genl_family, 0,
1506 THERMAL_GENL_CMD_EVENT);
1507 if (!msg_header) {
1508 nlmsg_free(skb);
1509 return -ENOMEM;
1510 }
1511
1512 /* fill the data */
1513 attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1514 sizeof(struct thermal_genl_event));
1515
1516 if (!attr) {
1517 nlmsg_free(skb);
1518 return -EINVAL;
1519 }
1520
1521 thermal_event = nla_data(attr);
1522 if (!thermal_event) {
1523 nlmsg_free(skb);
1524 return -EINVAL;
1525 }
1526
1527 memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1528
1529 thermal_event->orig = tz->id;
1530 thermal_event->event = event;
1531
1532 /* send multicast genetlink message */
1533 genlmsg_end(skb, msg_header);
1534
1535 result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
1536 0, GFP_ATOMIC);
1537 if (result)
1538 dev_err(&tz->device, "Failed to send netlink event:%d", result);
1539
1540 return result;
1541}
1542EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
1543
1544static int __init genetlink_init(void)
1545{
1546 return genl_register_family(&thermal_event_genl_family);
1547}
1548
1549static void genetlink_exit(void)
1550{
1551 genl_unregister_family(&thermal_event_genl_family);
1552}
1553#else /* !CONFIG_NET */
1554static inline int genetlink_init(void) { return 0; }
1555static inline void genetlink_exit(void) {}
1556#endif /* !CONFIG_NET */
1557
1558static int thermal_pm_notify(struct notifier_block *nb,
1559 unsigned long mode, void *_unused)
1560{
1561 struct thermal_zone_device *tz;
1562 enum thermal_device_mode tz_mode;
1563
1564 switch (mode) {
1565 case PM_HIBERNATION_PREPARE:
1566 case PM_RESTORE_PREPARE:
1567 case PM_SUSPEND_PREPARE:
1568 atomic_set(&in_suspend, 1);
1569 break;
1570 case PM_POST_HIBERNATION:
1571 case PM_POST_RESTORE:
1572 case PM_POST_SUSPEND:
1573 atomic_set(&in_suspend, 0);
1574 list_for_each_entry(tz, &thermal_tz_list, node) {
1575 tz_mode = THERMAL_DEVICE_ENABLED;
1576 if (tz->ops->get_mode)
1577 tz->ops->get_mode(tz, &tz_mode);
1578
1579 if (tz_mode == THERMAL_DEVICE_DISABLED)
1580 continue;
1581
1582 thermal_zone_device_init(tz);
1583 thermal_zone_device_update(tz,
1584 THERMAL_EVENT_UNSPECIFIED);
1585 }
1586 break;
1587 default:
1588 break;
1589 }
1590 return 0;
1591}
1592
1593static struct notifier_block thermal_pm_nb = {
1594 .notifier_call = thermal_pm_notify,
1595};
1596
1597static int __init thermal_init(void)
1598{
1599 int result;
1600
1601 mutex_init(&poweroff_lock);
1602 result = thermal_register_governors();
1603 if (result)
1604 goto error;
1605
1606 result = class_register(&thermal_class);
1607 if (result)
1608 goto unregister_governors;
1609
1610 result = genetlink_init();
1611 if (result)
1612 goto unregister_class;
1613
1614 result = of_parse_thermal_zones();
1615 if (result)
1616 goto exit_netlink;
1617
1618 result = register_pm_notifier(&thermal_pm_nb);
1619 if (result)
1620 pr_warn("Thermal: Can not register suspend notifier, return %d\n",
1621 result);
1622
1623 return 0;
1624
1625exit_netlink:
1626 genetlink_exit();
1627unregister_class:
1628 class_unregister(&thermal_class);
1629unregister_governors:
1630 thermal_unregister_governors();
1631error:
1632 ida_destroy(&thermal_tz_ida);
1633 ida_destroy(&thermal_cdev_ida);
1634 mutex_destroy(&thermal_list_lock);
1635 mutex_destroy(&thermal_governor_lock);
1636 mutex_destroy(&poweroff_lock);
1637 return result;
1638}
1639fs_initcall(thermal_init);