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1/*
2 * thermal.c - Generic Thermal Management Sysfs support.
3 *
4 * Copyright (C) 2008 Intel Corp
5 * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
6 * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2 of the License.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 */
25
26#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
28#include <linux/module.h>
29#include <linux/device.h>
30#include <linux/err.h>
31#include <linux/slab.h>
32#include <linux/kdev_t.h>
33#include <linux/idr.h>
34#include <linux/thermal.h>
35#include <linux/reboot.h>
36#include <linux/string.h>
37#include <linux/of.h>
38#include <net/netlink.h>
39#include <net/genetlink.h>
40#include <linux/suspend.h>
41
42#define CREATE_TRACE_POINTS
43#include <trace/events/thermal.h>
44
45#include "thermal_core.h"
46#include "thermal_hwmon.h"
47
48MODULE_AUTHOR("Zhang Rui");
49MODULE_DESCRIPTION("Generic thermal management sysfs support");
50MODULE_LICENSE("GPL v2");
51
52static DEFINE_IDR(thermal_tz_idr);
53static DEFINE_IDR(thermal_cdev_idr);
54static DEFINE_MUTEX(thermal_idr_lock);
55
56static LIST_HEAD(thermal_tz_list);
57static LIST_HEAD(thermal_cdev_list);
58static LIST_HEAD(thermal_governor_list);
59
60static DEFINE_MUTEX(thermal_list_lock);
61static DEFINE_MUTEX(thermal_governor_lock);
62
63static atomic_t in_suspend;
64
65static struct thermal_governor *def_governor;
66
67static struct thermal_governor *__find_governor(const char *name)
68{
69 struct thermal_governor *pos;
70
71 if (!name || !name[0])
72 return def_governor;
73
74 list_for_each_entry(pos, &thermal_governor_list, governor_list)
75 if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH))
76 return pos;
77
78 return NULL;
79}
80
81/**
82 * bind_previous_governor() - bind the previous governor of the thermal zone
83 * @tz: a valid pointer to a struct thermal_zone_device
84 * @failed_gov_name: the name of the governor that failed to register
85 *
86 * Register the previous governor of the thermal zone after a new
87 * governor has failed to be bound.
88 */
89static void bind_previous_governor(struct thermal_zone_device *tz,
90 const char *failed_gov_name)
91{
92 if (tz->governor && tz->governor->bind_to_tz) {
93 if (tz->governor->bind_to_tz(tz)) {
94 dev_err(&tz->device,
95 "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n",
96 failed_gov_name, tz->governor->name, tz->type);
97 tz->governor = NULL;
98 }
99 }
100}
101
102/**
103 * thermal_set_governor() - Switch to another governor
104 * @tz: a valid pointer to a struct thermal_zone_device
105 * @new_gov: pointer to the new governor
106 *
107 * Change the governor of thermal zone @tz.
108 *
109 * Return: 0 on success, an error if the new governor's bind_to_tz() failed.
110 */
111static int thermal_set_governor(struct thermal_zone_device *tz,
112 struct thermal_governor *new_gov)
113{
114 int ret = 0;
115
116 if (tz->governor && tz->governor->unbind_from_tz)
117 tz->governor->unbind_from_tz(tz);
118
119 if (new_gov && new_gov->bind_to_tz) {
120 ret = new_gov->bind_to_tz(tz);
121 if (ret) {
122 bind_previous_governor(tz, new_gov->name);
123
124 return ret;
125 }
126 }
127
128 tz->governor = new_gov;
129
130 return ret;
131}
132
133int thermal_register_governor(struct thermal_governor *governor)
134{
135 int err;
136 const char *name;
137 struct thermal_zone_device *pos;
138
139 if (!governor)
140 return -EINVAL;
141
142 mutex_lock(&thermal_governor_lock);
143
144 err = -EBUSY;
145 if (__find_governor(governor->name) == NULL) {
146 err = 0;
147 list_add(&governor->governor_list, &thermal_governor_list);
148 if (!def_governor && !strncmp(governor->name,
149 DEFAULT_THERMAL_GOVERNOR, THERMAL_NAME_LENGTH))
150 def_governor = governor;
151 }
152
153 mutex_lock(&thermal_list_lock);
154
155 list_for_each_entry(pos, &thermal_tz_list, node) {
156 /*
157 * only thermal zones with specified tz->tzp->governor_name
158 * may run with tz->govenor unset
159 */
160 if (pos->governor)
161 continue;
162
163 name = pos->tzp->governor_name;
164
165 if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) {
166 int ret;
167
168 ret = thermal_set_governor(pos, governor);
169 if (ret)
170 dev_err(&pos->device,
171 "Failed to set governor %s for thermal zone %s: %d\n",
172 governor->name, pos->type, ret);
173 }
174 }
175
176 mutex_unlock(&thermal_list_lock);
177 mutex_unlock(&thermal_governor_lock);
178
179 return err;
180}
181
182void thermal_unregister_governor(struct thermal_governor *governor)
183{
184 struct thermal_zone_device *pos;
185
186 if (!governor)
187 return;
188
189 mutex_lock(&thermal_governor_lock);
190
191 if (__find_governor(governor->name) == NULL)
192 goto exit;
193
194 mutex_lock(&thermal_list_lock);
195
196 list_for_each_entry(pos, &thermal_tz_list, node) {
197 if (!strncasecmp(pos->governor->name, governor->name,
198 THERMAL_NAME_LENGTH))
199 thermal_set_governor(pos, NULL);
200 }
201
202 mutex_unlock(&thermal_list_lock);
203 list_del(&governor->governor_list);
204exit:
205 mutex_unlock(&thermal_governor_lock);
206 return;
207}
208
209static int get_idr(struct idr *idr, struct mutex *lock, int *id)
210{
211 int ret;
212
213 if (lock)
214 mutex_lock(lock);
215 ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
216 if (lock)
217 mutex_unlock(lock);
218 if (unlikely(ret < 0))
219 return ret;
220 *id = ret;
221 return 0;
222}
223
224static void release_idr(struct idr *idr, struct mutex *lock, int id)
225{
226 if (lock)
227 mutex_lock(lock);
228 idr_remove(idr, id);
229 if (lock)
230 mutex_unlock(lock);
231}
232
233int get_tz_trend(struct thermal_zone_device *tz, int trip)
234{
235 enum thermal_trend trend;
236
237 if (tz->emul_temperature || !tz->ops->get_trend ||
238 tz->ops->get_trend(tz, trip, &trend)) {
239 if (tz->temperature > tz->last_temperature)
240 trend = THERMAL_TREND_RAISING;
241 else if (tz->temperature < tz->last_temperature)
242 trend = THERMAL_TREND_DROPPING;
243 else
244 trend = THERMAL_TREND_STABLE;
245 }
246
247 return trend;
248}
249EXPORT_SYMBOL(get_tz_trend);
250
251struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
252 struct thermal_cooling_device *cdev, int trip)
253{
254 struct thermal_instance *pos = NULL;
255 struct thermal_instance *target_instance = NULL;
256
257 mutex_lock(&tz->lock);
258 mutex_lock(&cdev->lock);
259
260 list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
261 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
262 target_instance = pos;
263 break;
264 }
265 }
266
267 mutex_unlock(&cdev->lock);
268 mutex_unlock(&tz->lock);
269
270 return target_instance;
271}
272EXPORT_SYMBOL(get_thermal_instance);
273
274static void print_bind_err_msg(struct thermal_zone_device *tz,
275 struct thermal_cooling_device *cdev, int ret)
276{
277 dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
278 tz->type, cdev->type, ret);
279}
280
281static void __bind(struct thermal_zone_device *tz, int mask,
282 struct thermal_cooling_device *cdev,
283 unsigned long *limits,
284 unsigned int weight)
285{
286 int i, ret;
287
288 for (i = 0; i < tz->trips; i++) {
289 if (mask & (1 << i)) {
290 unsigned long upper, lower;
291
292 upper = THERMAL_NO_LIMIT;
293 lower = THERMAL_NO_LIMIT;
294 if (limits) {
295 lower = limits[i * 2];
296 upper = limits[i * 2 + 1];
297 }
298 ret = thermal_zone_bind_cooling_device(tz, i, cdev,
299 upper, lower,
300 weight);
301 if (ret)
302 print_bind_err_msg(tz, cdev, ret);
303 }
304 }
305}
306
307static void __unbind(struct thermal_zone_device *tz, int mask,
308 struct thermal_cooling_device *cdev)
309{
310 int i;
311
312 for (i = 0; i < tz->trips; i++)
313 if (mask & (1 << i))
314 thermal_zone_unbind_cooling_device(tz, i, cdev);
315}
316
317static void bind_cdev(struct thermal_cooling_device *cdev)
318{
319 int i, ret;
320 const struct thermal_zone_params *tzp;
321 struct thermal_zone_device *pos = NULL;
322
323 mutex_lock(&thermal_list_lock);
324
325 list_for_each_entry(pos, &thermal_tz_list, node) {
326 if (!pos->tzp && !pos->ops->bind)
327 continue;
328
329 if (pos->ops->bind) {
330 ret = pos->ops->bind(pos, cdev);
331 if (ret)
332 print_bind_err_msg(pos, cdev, ret);
333 continue;
334 }
335
336 tzp = pos->tzp;
337 if (!tzp || !tzp->tbp)
338 continue;
339
340 for (i = 0; i < tzp->num_tbps; i++) {
341 if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
342 continue;
343 if (tzp->tbp[i].match(pos, cdev))
344 continue;
345 tzp->tbp[i].cdev = cdev;
346 __bind(pos, tzp->tbp[i].trip_mask, cdev,
347 tzp->tbp[i].binding_limits,
348 tzp->tbp[i].weight);
349 }
350 }
351
352 mutex_unlock(&thermal_list_lock);
353}
354
355static void bind_tz(struct thermal_zone_device *tz)
356{
357 int i, ret;
358 struct thermal_cooling_device *pos = NULL;
359 const struct thermal_zone_params *tzp = tz->tzp;
360
361 if (!tzp && !tz->ops->bind)
362 return;
363
364 mutex_lock(&thermal_list_lock);
365
366 /* If there is ops->bind, try to use ops->bind */
367 if (tz->ops->bind) {
368 list_for_each_entry(pos, &thermal_cdev_list, node) {
369 ret = tz->ops->bind(tz, pos);
370 if (ret)
371 print_bind_err_msg(tz, pos, ret);
372 }
373 goto exit;
374 }
375
376 if (!tzp || !tzp->tbp)
377 goto exit;
378
379 list_for_each_entry(pos, &thermal_cdev_list, node) {
380 for (i = 0; i < tzp->num_tbps; i++) {
381 if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
382 continue;
383 if (tzp->tbp[i].match(tz, pos))
384 continue;
385 tzp->tbp[i].cdev = pos;
386 __bind(tz, tzp->tbp[i].trip_mask, pos,
387 tzp->tbp[i].binding_limits,
388 tzp->tbp[i].weight);
389 }
390 }
391exit:
392 mutex_unlock(&thermal_list_lock);
393}
394
395static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
396 int delay)
397{
398 if (delay > 1000)
399 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
400 round_jiffies(msecs_to_jiffies(delay)));
401 else if (delay)
402 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
403 msecs_to_jiffies(delay));
404 else
405 cancel_delayed_work(&tz->poll_queue);
406}
407
408static void monitor_thermal_zone(struct thermal_zone_device *tz)
409{
410 mutex_lock(&tz->lock);
411
412 if (tz->passive)
413 thermal_zone_device_set_polling(tz, tz->passive_delay);
414 else if (tz->polling_delay)
415 thermal_zone_device_set_polling(tz, tz->polling_delay);
416 else
417 thermal_zone_device_set_polling(tz, 0);
418
419 mutex_unlock(&tz->lock);
420}
421
422static void handle_non_critical_trips(struct thermal_zone_device *tz,
423 int trip, enum thermal_trip_type trip_type)
424{
425 tz->governor ? tz->governor->throttle(tz, trip) :
426 def_governor->throttle(tz, trip);
427}
428
429static void handle_critical_trips(struct thermal_zone_device *tz,
430 int trip, enum thermal_trip_type trip_type)
431{
432 int trip_temp;
433
434 tz->ops->get_trip_temp(tz, trip, &trip_temp);
435
436 /* If we have not crossed the trip_temp, we do not care. */
437 if (trip_temp <= 0 || tz->temperature < trip_temp)
438 return;
439
440 trace_thermal_zone_trip(tz, trip, trip_type);
441
442 if (tz->ops->notify)
443 tz->ops->notify(tz, trip, trip_type);
444
445 if (trip_type == THERMAL_TRIP_CRITICAL) {
446 dev_emerg(&tz->device,
447 "critical temperature reached(%d C),shutting down\n",
448 tz->temperature / 1000);
449 orderly_poweroff(true);
450 }
451}
452
453static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
454{
455 enum thermal_trip_type type;
456
457 /* Ignore disabled trip points */
458 if (test_bit(trip, &tz->trips_disabled))
459 return;
460
461 tz->ops->get_trip_type(tz, trip, &type);
462
463 if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
464 handle_critical_trips(tz, trip, type);
465 else
466 handle_non_critical_trips(tz, trip, type);
467 /*
468 * Alright, we handled this trip successfully.
469 * So, start monitoring again.
470 */
471 monitor_thermal_zone(tz);
472}
473
474/**
475 * thermal_zone_get_temp() - returns the temperature of a thermal zone
476 * @tz: a valid pointer to a struct thermal_zone_device
477 * @temp: a valid pointer to where to store the resulting temperature.
478 *
479 * When a valid thermal zone reference is passed, it will fetch its
480 * temperature and fill @temp.
481 *
482 * Return: On success returns 0, an error code otherwise
483 */
484int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
485{
486 int ret = -EINVAL;
487 int count;
488 int crit_temp = INT_MAX;
489 enum thermal_trip_type type;
490
491 if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
492 goto exit;
493
494 mutex_lock(&tz->lock);
495
496 ret = tz->ops->get_temp(tz, temp);
497
498 if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {
499 for (count = 0; count < tz->trips; count++) {
500 ret = tz->ops->get_trip_type(tz, count, &type);
501 if (!ret && type == THERMAL_TRIP_CRITICAL) {
502 ret = tz->ops->get_trip_temp(tz, count,
503 &crit_temp);
504 break;
505 }
506 }
507
508 /*
509 * Only allow emulating a temperature when the real temperature
510 * is below the critical temperature so that the emulation code
511 * cannot hide critical conditions.
512 */
513 if (!ret && *temp < crit_temp)
514 *temp = tz->emul_temperature;
515 }
516
517 mutex_unlock(&tz->lock);
518exit:
519 return ret;
520}
521EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
522
523static void update_temperature(struct thermal_zone_device *tz)
524{
525 int temp, ret;
526
527 ret = thermal_zone_get_temp(tz, &temp);
528 if (ret) {
529 if (ret != -EAGAIN)
530 dev_warn(&tz->device,
531 "failed to read out thermal zone (%d)\n",
532 ret);
533 return;
534 }
535
536 mutex_lock(&tz->lock);
537 tz->last_temperature = tz->temperature;
538 tz->temperature = temp;
539 mutex_unlock(&tz->lock);
540
541 trace_thermal_temperature(tz);
542 if (tz->last_temperature == THERMAL_TEMP_INVALID)
543 dev_dbg(&tz->device, "last_temperature N/A, current_temperature=%d\n",
544 tz->temperature);
545 else
546 dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
547 tz->last_temperature, tz->temperature);
548}
549
550static void thermal_zone_device_reset(struct thermal_zone_device *tz)
551{
552 struct thermal_instance *pos;
553
554 tz->temperature = THERMAL_TEMP_INVALID;
555 tz->passive = 0;
556 list_for_each_entry(pos, &tz->thermal_instances, tz_node)
557 pos->initialized = false;
558}
559
560void thermal_zone_device_update(struct thermal_zone_device *tz)
561{
562 int count;
563
564 if (atomic_read(&in_suspend))
565 return;
566
567 if (!tz->ops->get_temp)
568 return;
569
570 update_temperature(tz);
571
572 for (count = 0; count < tz->trips; count++)
573 handle_thermal_trip(tz, count);
574}
575EXPORT_SYMBOL_GPL(thermal_zone_device_update);
576
577static void thermal_zone_device_check(struct work_struct *work)
578{
579 struct thermal_zone_device *tz = container_of(work, struct
580 thermal_zone_device,
581 poll_queue.work);
582 thermal_zone_device_update(tz);
583}
584
585/* sys I/F for thermal zone */
586
587#define to_thermal_zone(_dev) \
588 container_of(_dev, struct thermal_zone_device, device)
589
590static ssize_t
591type_show(struct device *dev, struct device_attribute *attr, char *buf)
592{
593 struct thermal_zone_device *tz = to_thermal_zone(dev);
594
595 return sprintf(buf, "%s\n", tz->type);
596}
597
598static ssize_t
599temp_show(struct device *dev, struct device_attribute *attr, char *buf)
600{
601 struct thermal_zone_device *tz = to_thermal_zone(dev);
602 int temperature, ret;
603
604 ret = thermal_zone_get_temp(tz, &temperature);
605
606 if (ret)
607 return ret;
608
609 return sprintf(buf, "%d\n", temperature);
610}
611
612static ssize_t
613mode_show(struct device *dev, struct device_attribute *attr, char *buf)
614{
615 struct thermal_zone_device *tz = to_thermal_zone(dev);
616 enum thermal_device_mode mode;
617 int result;
618
619 if (!tz->ops->get_mode)
620 return -EPERM;
621
622 result = tz->ops->get_mode(tz, &mode);
623 if (result)
624 return result;
625
626 return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
627 : "disabled");
628}
629
630static ssize_t
631mode_store(struct device *dev, struct device_attribute *attr,
632 const char *buf, size_t count)
633{
634 struct thermal_zone_device *tz = to_thermal_zone(dev);
635 int result;
636
637 if (!tz->ops->set_mode)
638 return -EPERM;
639
640 if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
641 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
642 else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
643 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
644 else
645 result = -EINVAL;
646
647 if (result)
648 return result;
649
650 return count;
651}
652
653static ssize_t
654trip_point_type_show(struct device *dev, struct device_attribute *attr,
655 char *buf)
656{
657 struct thermal_zone_device *tz = to_thermal_zone(dev);
658 enum thermal_trip_type type;
659 int trip, result;
660
661 if (!tz->ops->get_trip_type)
662 return -EPERM;
663
664 if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
665 return -EINVAL;
666
667 result = tz->ops->get_trip_type(tz, trip, &type);
668 if (result)
669 return result;
670
671 switch (type) {
672 case THERMAL_TRIP_CRITICAL:
673 return sprintf(buf, "critical\n");
674 case THERMAL_TRIP_HOT:
675 return sprintf(buf, "hot\n");
676 case THERMAL_TRIP_PASSIVE:
677 return sprintf(buf, "passive\n");
678 case THERMAL_TRIP_ACTIVE:
679 return sprintf(buf, "active\n");
680 default:
681 return sprintf(buf, "unknown\n");
682 }
683}
684
685static ssize_t
686trip_point_temp_store(struct device *dev, struct device_attribute *attr,
687 const char *buf, size_t count)
688{
689 struct thermal_zone_device *tz = to_thermal_zone(dev);
690 int trip, ret;
691 int temperature;
692
693 if (!tz->ops->set_trip_temp)
694 return -EPERM;
695
696 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
697 return -EINVAL;
698
699 if (kstrtoint(buf, 10, &temperature))
700 return -EINVAL;
701
702 ret = tz->ops->set_trip_temp(tz, trip, temperature);
703 if (ret)
704 return ret;
705
706 thermal_zone_device_update(tz);
707
708 return count;
709}
710
711static ssize_t
712trip_point_temp_show(struct device *dev, struct device_attribute *attr,
713 char *buf)
714{
715 struct thermal_zone_device *tz = to_thermal_zone(dev);
716 int trip, ret;
717 int temperature;
718
719 if (!tz->ops->get_trip_temp)
720 return -EPERM;
721
722 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
723 return -EINVAL;
724
725 ret = tz->ops->get_trip_temp(tz, trip, &temperature);
726
727 if (ret)
728 return ret;
729
730 return sprintf(buf, "%d\n", temperature);
731}
732
733static ssize_t
734trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
735 const char *buf, size_t count)
736{
737 struct thermal_zone_device *tz = to_thermal_zone(dev);
738 int trip, ret;
739 int temperature;
740
741 if (!tz->ops->set_trip_hyst)
742 return -EPERM;
743
744 if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
745 return -EINVAL;
746
747 if (kstrtoint(buf, 10, &temperature))
748 return -EINVAL;
749
750 /*
751 * We are not doing any check on the 'temperature' value
752 * here. The driver implementing 'set_trip_hyst' has to
753 * take care of this.
754 */
755 ret = tz->ops->set_trip_hyst(tz, trip, temperature);
756
757 return ret ? ret : count;
758}
759
760static ssize_t
761trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
762 char *buf)
763{
764 struct thermal_zone_device *tz = to_thermal_zone(dev);
765 int trip, ret;
766 int temperature;
767
768 if (!tz->ops->get_trip_hyst)
769 return -EPERM;
770
771 if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
772 return -EINVAL;
773
774 ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
775
776 return ret ? ret : sprintf(buf, "%d\n", temperature);
777}
778
779static ssize_t
780passive_store(struct device *dev, struct device_attribute *attr,
781 const char *buf, size_t count)
782{
783 struct thermal_zone_device *tz = to_thermal_zone(dev);
784 struct thermal_cooling_device *cdev = NULL;
785 int state;
786
787 if (!sscanf(buf, "%d\n", &state))
788 return -EINVAL;
789
790 /* sanity check: values below 1000 millicelcius don't make sense
791 * and can cause the system to go into a thermal heart attack
792 */
793 if (state && state < 1000)
794 return -EINVAL;
795
796 if (state && !tz->forced_passive) {
797 mutex_lock(&thermal_list_lock);
798 list_for_each_entry(cdev, &thermal_cdev_list, node) {
799 if (!strncmp("Processor", cdev->type,
800 sizeof("Processor")))
801 thermal_zone_bind_cooling_device(tz,
802 THERMAL_TRIPS_NONE, cdev,
803 THERMAL_NO_LIMIT,
804 THERMAL_NO_LIMIT,
805 THERMAL_WEIGHT_DEFAULT);
806 }
807 mutex_unlock(&thermal_list_lock);
808 if (!tz->passive_delay)
809 tz->passive_delay = 1000;
810 } else if (!state && tz->forced_passive) {
811 mutex_lock(&thermal_list_lock);
812 list_for_each_entry(cdev, &thermal_cdev_list, node) {
813 if (!strncmp("Processor", cdev->type,
814 sizeof("Processor")))
815 thermal_zone_unbind_cooling_device(tz,
816 THERMAL_TRIPS_NONE,
817 cdev);
818 }
819 mutex_unlock(&thermal_list_lock);
820 tz->passive_delay = 0;
821 }
822
823 tz->forced_passive = state;
824
825 thermal_zone_device_update(tz);
826
827 return count;
828}
829
830static ssize_t
831passive_show(struct device *dev, struct device_attribute *attr,
832 char *buf)
833{
834 struct thermal_zone_device *tz = to_thermal_zone(dev);
835
836 return sprintf(buf, "%d\n", tz->forced_passive);
837}
838
839static ssize_t
840policy_store(struct device *dev, struct device_attribute *attr,
841 const char *buf, size_t count)
842{
843 int ret = -EINVAL;
844 struct thermal_zone_device *tz = to_thermal_zone(dev);
845 struct thermal_governor *gov;
846 char name[THERMAL_NAME_LENGTH];
847
848 snprintf(name, sizeof(name), "%s", buf);
849
850 mutex_lock(&thermal_governor_lock);
851 mutex_lock(&tz->lock);
852
853 gov = __find_governor(strim(name));
854 if (!gov)
855 goto exit;
856
857 ret = thermal_set_governor(tz, gov);
858 if (!ret)
859 ret = count;
860
861exit:
862 mutex_unlock(&tz->lock);
863 mutex_unlock(&thermal_governor_lock);
864 return ret;
865}
866
867static ssize_t
868policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
869{
870 struct thermal_zone_device *tz = to_thermal_zone(dev);
871
872 return sprintf(buf, "%s\n", tz->governor->name);
873}
874
875static ssize_t
876available_policies_show(struct device *dev, struct device_attribute *devattr,
877 char *buf)
878{
879 struct thermal_governor *pos;
880 ssize_t count = 0;
881 ssize_t size = PAGE_SIZE;
882
883 mutex_lock(&thermal_governor_lock);
884
885 list_for_each_entry(pos, &thermal_governor_list, governor_list) {
886 size = PAGE_SIZE - count;
887 count += scnprintf(buf + count, size, "%s ", pos->name);
888 }
889 count += scnprintf(buf + count, size, "\n");
890
891 mutex_unlock(&thermal_governor_lock);
892
893 return count;
894}
895
896static ssize_t
897emul_temp_store(struct device *dev, struct device_attribute *attr,
898 const char *buf, size_t count)
899{
900 struct thermal_zone_device *tz = to_thermal_zone(dev);
901 int ret = 0;
902 int temperature;
903
904 if (kstrtoint(buf, 10, &temperature))
905 return -EINVAL;
906
907 if (!tz->ops->set_emul_temp) {
908 mutex_lock(&tz->lock);
909 tz->emul_temperature = temperature;
910 mutex_unlock(&tz->lock);
911 } else {
912 ret = tz->ops->set_emul_temp(tz, temperature);
913 }
914
915 if (!ret)
916 thermal_zone_device_update(tz);
917
918 return ret ? ret : count;
919}
920static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
921
922static ssize_t
923sustainable_power_show(struct device *dev, struct device_attribute *devattr,
924 char *buf)
925{
926 struct thermal_zone_device *tz = to_thermal_zone(dev);
927
928 if (tz->tzp)
929 return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
930 else
931 return -EIO;
932}
933
934static ssize_t
935sustainable_power_store(struct device *dev, struct device_attribute *devattr,
936 const char *buf, size_t count)
937{
938 struct thermal_zone_device *tz = to_thermal_zone(dev);
939 u32 sustainable_power;
940
941 if (!tz->tzp)
942 return -EIO;
943
944 if (kstrtou32(buf, 10, &sustainable_power))
945 return -EINVAL;
946
947 tz->tzp->sustainable_power = sustainable_power;
948
949 return count;
950}
951static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
952 sustainable_power_store);
953
954#define create_s32_tzp_attr(name) \
955 static ssize_t \
956 name##_show(struct device *dev, struct device_attribute *devattr, \
957 char *buf) \
958 { \
959 struct thermal_zone_device *tz = to_thermal_zone(dev); \
960 \
961 if (tz->tzp) \
962 return sprintf(buf, "%d\n", tz->tzp->name); \
963 else \
964 return -EIO; \
965 } \
966 \
967 static ssize_t \
968 name##_store(struct device *dev, struct device_attribute *devattr, \
969 const char *buf, size_t count) \
970 { \
971 struct thermal_zone_device *tz = to_thermal_zone(dev); \
972 s32 value; \
973 \
974 if (!tz->tzp) \
975 return -EIO; \
976 \
977 if (kstrtos32(buf, 10, &value)) \
978 return -EINVAL; \
979 \
980 tz->tzp->name = value; \
981 \
982 return count; \
983 } \
984 static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
985
986create_s32_tzp_attr(k_po);
987create_s32_tzp_attr(k_pu);
988create_s32_tzp_attr(k_i);
989create_s32_tzp_attr(k_d);
990create_s32_tzp_attr(integral_cutoff);
991create_s32_tzp_attr(slope);
992create_s32_tzp_attr(offset);
993#undef create_s32_tzp_attr
994
995static struct device_attribute *dev_tzp_attrs[] = {
996 &dev_attr_sustainable_power,
997 &dev_attr_k_po,
998 &dev_attr_k_pu,
999 &dev_attr_k_i,
1000 &dev_attr_k_d,
1001 &dev_attr_integral_cutoff,
1002 &dev_attr_slope,
1003 &dev_attr_offset,
1004};
1005
1006static int create_tzp_attrs(struct device *dev)
1007{
1008 int i;
1009
1010 for (i = 0; i < ARRAY_SIZE(dev_tzp_attrs); i++) {
1011 int ret;
1012 struct device_attribute *dev_attr = dev_tzp_attrs[i];
1013
1014 ret = device_create_file(dev, dev_attr);
1015 if (ret)
1016 return ret;
1017 }
1018
1019 return 0;
1020}
1021
1022/**
1023 * power_actor_get_max_power() - get the maximum power that a cdev can consume
1024 * @cdev: pointer to &thermal_cooling_device
1025 * @tz: a valid thermal zone device pointer
1026 * @max_power: pointer in which to store the maximum power
1027 *
1028 * Calculate the maximum power consumption in milliwats that the
1029 * cooling device can currently consume and store it in @max_power.
1030 *
1031 * Return: 0 on success, -EINVAL if @cdev doesn't support the
1032 * power_actor API or -E* on other error.
1033 */
1034int power_actor_get_max_power(struct thermal_cooling_device *cdev,
1035 struct thermal_zone_device *tz, u32 *max_power)
1036{
1037 if (!cdev_is_power_actor(cdev))
1038 return -EINVAL;
1039
1040 return cdev->ops->state2power(cdev, tz, 0, max_power);
1041}
1042
1043/**
1044 * power_actor_get_min_power() - get the mainimum power that a cdev can consume
1045 * @cdev: pointer to &thermal_cooling_device
1046 * @tz: a valid thermal zone device pointer
1047 * @min_power: pointer in which to store the minimum power
1048 *
1049 * Calculate the minimum power consumption in milliwatts that the
1050 * cooling device can currently consume and store it in @min_power.
1051 *
1052 * Return: 0 on success, -EINVAL if @cdev doesn't support the
1053 * power_actor API or -E* on other error.
1054 */
1055int power_actor_get_min_power(struct thermal_cooling_device *cdev,
1056 struct thermal_zone_device *tz, u32 *min_power)
1057{
1058 unsigned long max_state;
1059 int ret;
1060
1061 if (!cdev_is_power_actor(cdev))
1062 return -EINVAL;
1063
1064 ret = cdev->ops->get_max_state(cdev, &max_state);
1065 if (ret)
1066 return ret;
1067
1068 return cdev->ops->state2power(cdev, tz, max_state, min_power);
1069}
1070
1071/**
1072 * power_actor_set_power() - limit the maximum power that a cooling device can consume
1073 * @cdev: pointer to &thermal_cooling_device
1074 * @instance: thermal instance to update
1075 * @power: the power in milliwatts
1076 *
1077 * Set the cooling device to consume at most @power milliwatts.
1078 *
1079 * Return: 0 on success, -EINVAL if the cooling device does not
1080 * implement the power actor API or -E* for other failures.
1081 */
1082int power_actor_set_power(struct thermal_cooling_device *cdev,
1083 struct thermal_instance *instance, u32 power)
1084{
1085 unsigned long state;
1086 int ret;
1087
1088 if (!cdev_is_power_actor(cdev))
1089 return -EINVAL;
1090
1091 ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
1092 if (ret)
1093 return ret;
1094
1095 instance->target = state;
1096 cdev->updated = false;
1097 thermal_cdev_update(cdev);
1098
1099 return 0;
1100}
1101
1102static DEVICE_ATTR(type, 0444, type_show, NULL);
1103static DEVICE_ATTR(temp, 0444, temp_show, NULL);
1104static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
1105static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
1106static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
1107static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
1108
1109/* sys I/F for cooling device */
1110#define to_cooling_device(_dev) \
1111 container_of(_dev, struct thermal_cooling_device, device)
1112
1113static ssize_t
1114thermal_cooling_device_type_show(struct device *dev,
1115 struct device_attribute *attr, char *buf)
1116{
1117 struct thermal_cooling_device *cdev = to_cooling_device(dev);
1118
1119 return sprintf(buf, "%s\n", cdev->type);
1120}
1121
1122static ssize_t
1123thermal_cooling_device_max_state_show(struct device *dev,
1124 struct device_attribute *attr, char *buf)
1125{
1126 struct thermal_cooling_device *cdev = to_cooling_device(dev);
1127 unsigned long state;
1128 int ret;
1129
1130 ret = cdev->ops->get_max_state(cdev, &state);
1131 if (ret)
1132 return ret;
1133 return sprintf(buf, "%ld\n", state);
1134}
1135
1136static ssize_t
1137thermal_cooling_device_cur_state_show(struct device *dev,
1138 struct device_attribute *attr, char *buf)
1139{
1140 struct thermal_cooling_device *cdev = to_cooling_device(dev);
1141 unsigned long state;
1142 int ret;
1143
1144 ret = cdev->ops->get_cur_state(cdev, &state);
1145 if (ret)
1146 return ret;
1147 return sprintf(buf, "%ld\n", state);
1148}
1149
1150static ssize_t
1151thermal_cooling_device_cur_state_store(struct device *dev,
1152 struct device_attribute *attr,
1153 const char *buf, size_t count)
1154{
1155 struct thermal_cooling_device *cdev = to_cooling_device(dev);
1156 unsigned long state;
1157 int result;
1158
1159 if (!sscanf(buf, "%ld\n", &state))
1160 return -EINVAL;
1161
1162 if ((long)state < 0)
1163 return -EINVAL;
1164
1165 result = cdev->ops->set_cur_state(cdev, state);
1166 if (result)
1167 return result;
1168 return count;
1169}
1170
1171static struct device_attribute dev_attr_cdev_type =
1172__ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
1173static DEVICE_ATTR(max_state, 0444,
1174 thermal_cooling_device_max_state_show, NULL);
1175static DEVICE_ATTR(cur_state, 0644,
1176 thermal_cooling_device_cur_state_show,
1177 thermal_cooling_device_cur_state_store);
1178
1179static ssize_t
1180thermal_cooling_device_trip_point_show(struct device *dev,
1181 struct device_attribute *attr, char *buf)
1182{
1183 struct thermal_instance *instance;
1184
1185 instance =
1186 container_of(attr, struct thermal_instance, attr);
1187
1188 if (instance->trip == THERMAL_TRIPS_NONE)
1189 return sprintf(buf, "-1\n");
1190 else
1191 return sprintf(buf, "%d\n", instance->trip);
1192}
1193
1194static struct attribute *cooling_device_attrs[] = {
1195 &dev_attr_cdev_type.attr,
1196 &dev_attr_max_state.attr,
1197 &dev_attr_cur_state.attr,
1198 NULL,
1199};
1200
1201static const struct attribute_group cooling_device_attr_group = {
1202 .attrs = cooling_device_attrs,
1203};
1204
1205static const struct attribute_group *cooling_device_attr_groups[] = {
1206 &cooling_device_attr_group,
1207 NULL,
1208};
1209
1210static ssize_t
1211thermal_cooling_device_weight_show(struct device *dev,
1212 struct device_attribute *attr, char *buf)
1213{
1214 struct thermal_instance *instance;
1215
1216 instance = container_of(attr, struct thermal_instance, weight_attr);
1217
1218 return sprintf(buf, "%d\n", instance->weight);
1219}
1220
1221static ssize_t
1222thermal_cooling_device_weight_store(struct device *dev,
1223 struct device_attribute *attr,
1224 const char *buf, size_t count)
1225{
1226 struct thermal_instance *instance;
1227 int ret, weight;
1228
1229 ret = kstrtoint(buf, 0, &weight);
1230 if (ret)
1231 return ret;
1232
1233 instance = container_of(attr, struct thermal_instance, weight_attr);
1234 instance->weight = weight;
1235
1236 return count;
1237}
1238/* Device management */
1239
1240/**
1241 * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
1242 * @tz: pointer to struct thermal_zone_device
1243 * @trip: indicates which trip point the cooling devices is
1244 * associated with in this thermal zone.
1245 * @cdev: pointer to struct thermal_cooling_device
1246 * @upper: the Maximum cooling state for this trip point.
1247 * THERMAL_NO_LIMIT means no upper limit,
1248 * and the cooling device can be in max_state.
1249 * @lower: the Minimum cooling state can be used for this trip point.
1250 * THERMAL_NO_LIMIT means no lower limit,
1251 * and the cooling device can be in cooling state 0.
1252 * @weight: The weight of the cooling device to be bound to the
1253 * thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
1254 * default value
1255 *
1256 * This interface function bind a thermal cooling device to the certain trip
1257 * point of a thermal zone device.
1258 * This function is usually called in the thermal zone device .bind callback.
1259 *
1260 * Return: 0 on success, the proper error value otherwise.
1261 */
1262int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1263 int trip,
1264 struct thermal_cooling_device *cdev,
1265 unsigned long upper, unsigned long lower,
1266 unsigned int weight)
1267{
1268 struct thermal_instance *dev;
1269 struct thermal_instance *pos;
1270 struct thermal_zone_device *pos1;
1271 struct thermal_cooling_device *pos2;
1272 unsigned long max_state;
1273 int result, ret;
1274
1275 if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1276 return -EINVAL;
1277
1278 list_for_each_entry(pos1, &thermal_tz_list, node) {
1279 if (pos1 == tz)
1280 break;
1281 }
1282 list_for_each_entry(pos2, &thermal_cdev_list, node) {
1283 if (pos2 == cdev)
1284 break;
1285 }
1286
1287 if (tz != pos1 || cdev != pos2)
1288 return -EINVAL;
1289
1290 ret = cdev->ops->get_max_state(cdev, &max_state);
1291 if (ret)
1292 return ret;
1293
1294 /* lower default 0, upper default max_state */
1295 lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1296 upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1297
1298 if (lower > upper || upper > max_state)
1299 return -EINVAL;
1300
1301 dev =
1302 kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1303 if (!dev)
1304 return -ENOMEM;
1305 dev->tz = tz;
1306 dev->cdev = cdev;
1307 dev->trip = trip;
1308 dev->upper = upper;
1309 dev->lower = lower;
1310 dev->target = THERMAL_NO_TARGET;
1311 dev->weight = weight;
1312
1313 result = get_idr(&tz->idr, &tz->lock, &dev->id);
1314 if (result)
1315 goto free_mem;
1316
1317 sprintf(dev->name, "cdev%d", dev->id);
1318 result =
1319 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1320 if (result)
1321 goto release_idr;
1322
1323 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1324 sysfs_attr_init(&dev->attr.attr);
1325 dev->attr.attr.name = dev->attr_name;
1326 dev->attr.attr.mode = 0444;
1327 dev->attr.show = thermal_cooling_device_trip_point_show;
1328 result = device_create_file(&tz->device, &dev->attr);
1329 if (result)
1330 goto remove_symbol_link;
1331
1332 sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
1333 sysfs_attr_init(&dev->weight_attr.attr);
1334 dev->weight_attr.attr.name = dev->weight_attr_name;
1335 dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
1336 dev->weight_attr.show = thermal_cooling_device_weight_show;
1337 dev->weight_attr.store = thermal_cooling_device_weight_store;
1338 result = device_create_file(&tz->device, &dev->weight_attr);
1339 if (result)
1340 goto remove_trip_file;
1341
1342 mutex_lock(&tz->lock);
1343 mutex_lock(&cdev->lock);
1344 list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1345 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1346 result = -EEXIST;
1347 break;
1348 }
1349 if (!result) {
1350 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1351 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1352 atomic_set(&tz->need_update, 1);
1353 }
1354 mutex_unlock(&cdev->lock);
1355 mutex_unlock(&tz->lock);
1356
1357 if (!result)
1358 return 0;
1359
1360 device_remove_file(&tz->device, &dev->weight_attr);
1361remove_trip_file:
1362 device_remove_file(&tz->device, &dev->attr);
1363remove_symbol_link:
1364 sysfs_remove_link(&tz->device.kobj, dev->name);
1365release_idr:
1366 release_idr(&tz->idr, &tz->lock, dev->id);
1367free_mem:
1368 kfree(dev);
1369 return result;
1370}
1371EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1372
1373/**
1374 * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1375 * thermal zone.
1376 * @tz: pointer to a struct thermal_zone_device.
1377 * @trip: indicates which trip point the cooling devices is
1378 * associated with in this thermal zone.
1379 * @cdev: pointer to a struct thermal_cooling_device.
1380 *
1381 * This interface function unbind a thermal cooling device from the certain
1382 * trip point of a thermal zone device.
1383 * This function is usually called in the thermal zone device .unbind callback.
1384 *
1385 * Return: 0 on success, the proper error value otherwise.
1386 */
1387int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1388 int trip,
1389 struct thermal_cooling_device *cdev)
1390{
1391 struct thermal_instance *pos, *next;
1392
1393 mutex_lock(&tz->lock);
1394 mutex_lock(&cdev->lock);
1395 list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1396 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1397 list_del(&pos->tz_node);
1398 list_del(&pos->cdev_node);
1399 mutex_unlock(&cdev->lock);
1400 mutex_unlock(&tz->lock);
1401 goto unbind;
1402 }
1403 }
1404 mutex_unlock(&cdev->lock);
1405 mutex_unlock(&tz->lock);
1406
1407 return -ENODEV;
1408
1409unbind:
1410 device_remove_file(&tz->device, &pos->weight_attr);
1411 device_remove_file(&tz->device, &pos->attr);
1412 sysfs_remove_link(&tz->device.kobj, pos->name);
1413 release_idr(&tz->idr, &tz->lock, pos->id);
1414 kfree(pos);
1415 return 0;
1416}
1417EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1418
1419static void thermal_release(struct device *dev)
1420{
1421 struct thermal_zone_device *tz;
1422 struct thermal_cooling_device *cdev;
1423
1424 if (!strncmp(dev_name(dev), "thermal_zone",
1425 sizeof("thermal_zone") - 1)) {
1426 tz = to_thermal_zone(dev);
1427 kfree(tz);
1428 } else if(!strncmp(dev_name(dev), "cooling_device",
1429 sizeof("cooling_device") - 1)){
1430 cdev = to_cooling_device(dev);
1431 kfree(cdev);
1432 }
1433}
1434
1435static struct class thermal_class = {
1436 .name = "thermal",
1437 .dev_release = thermal_release,
1438};
1439
1440/**
1441 * __thermal_cooling_device_register() - register a new thermal cooling device
1442 * @np: a pointer to a device tree node.
1443 * @type: the thermal cooling device type.
1444 * @devdata: device private data.
1445 * @ops: standard thermal cooling devices callbacks.
1446 *
1447 * This interface function adds a new thermal cooling device (fan/processor/...)
1448 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1449 * to all the thermal zone devices registered at the same time.
1450 * It also gives the opportunity to link the cooling device to a device tree
1451 * node, so that it can be bound to a thermal zone created out of device tree.
1452 *
1453 * Return: a pointer to the created struct thermal_cooling_device or an
1454 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1455 */
1456static struct thermal_cooling_device *
1457__thermal_cooling_device_register(struct device_node *np,
1458 char *type, void *devdata,
1459 const struct thermal_cooling_device_ops *ops)
1460{
1461 struct thermal_cooling_device *cdev;
1462 struct thermal_zone_device *pos = NULL;
1463 int result;
1464
1465 if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1466 return ERR_PTR(-EINVAL);
1467
1468 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1469 !ops->set_cur_state)
1470 return ERR_PTR(-EINVAL);
1471
1472 cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1473 if (!cdev)
1474 return ERR_PTR(-ENOMEM);
1475
1476 result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1477 if (result) {
1478 kfree(cdev);
1479 return ERR_PTR(result);
1480 }
1481
1482 strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1483 mutex_init(&cdev->lock);
1484 INIT_LIST_HEAD(&cdev->thermal_instances);
1485 cdev->np = np;
1486 cdev->ops = ops;
1487 cdev->updated = false;
1488 cdev->device.class = &thermal_class;
1489 cdev->device.groups = cooling_device_attr_groups;
1490 cdev->devdata = devdata;
1491 dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1492 result = device_register(&cdev->device);
1493 if (result) {
1494 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1495 kfree(cdev);
1496 return ERR_PTR(result);
1497 }
1498
1499 /* Add 'this' new cdev to the global cdev list */
1500 mutex_lock(&thermal_list_lock);
1501 list_add(&cdev->node, &thermal_cdev_list);
1502 mutex_unlock(&thermal_list_lock);
1503
1504 /* Update binding information for 'this' new cdev */
1505 bind_cdev(cdev);
1506
1507 mutex_lock(&thermal_list_lock);
1508 list_for_each_entry(pos, &thermal_tz_list, node)
1509 if (atomic_cmpxchg(&pos->need_update, 1, 0))
1510 thermal_zone_device_update(pos);
1511 mutex_unlock(&thermal_list_lock);
1512
1513 return cdev;
1514}
1515
1516/**
1517 * thermal_cooling_device_register() - register a new thermal cooling device
1518 * @type: the thermal cooling device type.
1519 * @devdata: device private data.
1520 * @ops: standard thermal cooling devices callbacks.
1521 *
1522 * This interface function adds a new thermal cooling device (fan/processor/...)
1523 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1524 * to all the thermal zone devices registered at the same time.
1525 *
1526 * Return: a pointer to the created struct thermal_cooling_device or an
1527 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1528 */
1529struct thermal_cooling_device *
1530thermal_cooling_device_register(char *type, void *devdata,
1531 const struct thermal_cooling_device_ops *ops)
1532{
1533 return __thermal_cooling_device_register(NULL, type, devdata, ops);
1534}
1535EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1536
1537/**
1538 * thermal_of_cooling_device_register() - register an OF thermal cooling device
1539 * @np: a pointer to a device tree node.
1540 * @type: the thermal cooling device type.
1541 * @devdata: device private data.
1542 * @ops: standard thermal cooling devices callbacks.
1543 *
1544 * This function will register a cooling device with device tree node reference.
1545 * This interface function adds a new thermal cooling device (fan/processor/...)
1546 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1547 * to all the thermal zone devices registered at the same time.
1548 *
1549 * Return: a pointer to the created struct thermal_cooling_device or an
1550 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1551 */
1552struct thermal_cooling_device *
1553thermal_of_cooling_device_register(struct device_node *np,
1554 char *type, void *devdata,
1555 const struct thermal_cooling_device_ops *ops)
1556{
1557 return __thermal_cooling_device_register(np, type, devdata, ops);
1558}
1559EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1560
1561/**
1562 * thermal_cooling_device_unregister - removes the registered thermal cooling device
1563 * @cdev: the thermal cooling device to remove.
1564 *
1565 * thermal_cooling_device_unregister() must be called when the device is no
1566 * longer needed.
1567 */
1568void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1569{
1570 int i;
1571 const struct thermal_zone_params *tzp;
1572 struct thermal_zone_device *tz;
1573 struct thermal_cooling_device *pos = NULL;
1574
1575 if (!cdev)
1576 return;
1577
1578 mutex_lock(&thermal_list_lock);
1579 list_for_each_entry(pos, &thermal_cdev_list, node)
1580 if (pos == cdev)
1581 break;
1582 if (pos != cdev) {
1583 /* thermal cooling device not found */
1584 mutex_unlock(&thermal_list_lock);
1585 return;
1586 }
1587 list_del(&cdev->node);
1588
1589 /* Unbind all thermal zones associated with 'this' cdev */
1590 list_for_each_entry(tz, &thermal_tz_list, node) {
1591 if (tz->ops->unbind) {
1592 tz->ops->unbind(tz, cdev);
1593 continue;
1594 }
1595
1596 if (!tz->tzp || !tz->tzp->tbp)
1597 continue;
1598
1599 tzp = tz->tzp;
1600 for (i = 0; i < tzp->num_tbps; i++) {
1601 if (tzp->tbp[i].cdev == cdev) {
1602 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1603 tzp->tbp[i].cdev = NULL;
1604 }
1605 }
1606 }
1607
1608 mutex_unlock(&thermal_list_lock);
1609
1610 if (cdev->type[0])
1611 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1612 device_remove_file(&cdev->device, &dev_attr_max_state);
1613 device_remove_file(&cdev->device, &dev_attr_cur_state);
1614
1615 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1616 device_unregister(&cdev->device);
1617 return;
1618}
1619EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1620
1621void thermal_cdev_update(struct thermal_cooling_device *cdev)
1622{
1623 struct thermal_instance *instance;
1624 unsigned long target = 0;
1625
1626 /* cooling device is updated*/
1627 if (cdev->updated)
1628 return;
1629
1630 mutex_lock(&cdev->lock);
1631 /* Make sure cdev enters the deepest cooling state */
1632 list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1633 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1634 instance->tz->id, instance->target);
1635 if (instance->target == THERMAL_NO_TARGET)
1636 continue;
1637 if (instance->target > target)
1638 target = instance->target;
1639 }
1640 mutex_unlock(&cdev->lock);
1641 cdev->ops->set_cur_state(cdev, target);
1642 cdev->updated = true;
1643 trace_cdev_update(cdev, target);
1644 dev_dbg(&cdev->device, "set to state %lu\n", target);
1645}
1646EXPORT_SYMBOL(thermal_cdev_update);
1647
1648/**
1649 * thermal_notify_framework - Sensor drivers use this API to notify framework
1650 * @tz: thermal zone device
1651 * @trip: indicates which trip point has been crossed
1652 *
1653 * This function handles the trip events from sensor drivers. It starts
1654 * throttling the cooling devices according to the policy configured.
1655 * For CRITICAL and HOT trip points, this notifies the respective drivers,
1656 * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1657 * The throttling policy is based on the configured platform data; if no
1658 * platform data is provided, this uses the step_wise throttling policy.
1659 */
1660void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1661{
1662 handle_thermal_trip(tz, trip);
1663}
1664EXPORT_SYMBOL_GPL(thermal_notify_framework);
1665
1666/**
1667 * create_trip_attrs() - create attributes for trip points
1668 * @tz: the thermal zone device
1669 * @mask: Writeable trip point bitmap.
1670 *
1671 * helper function to instantiate sysfs entries for every trip
1672 * point and its properties of a struct thermal_zone_device.
1673 *
1674 * Return: 0 on success, the proper error value otherwise.
1675 */
1676static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1677{
1678 int indx;
1679 int size = sizeof(struct thermal_attr) * tz->trips;
1680
1681 tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1682 if (!tz->trip_type_attrs)
1683 return -ENOMEM;
1684
1685 tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1686 if (!tz->trip_temp_attrs) {
1687 kfree(tz->trip_type_attrs);
1688 return -ENOMEM;
1689 }
1690
1691 if (tz->ops->get_trip_hyst) {
1692 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1693 if (!tz->trip_hyst_attrs) {
1694 kfree(tz->trip_type_attrs);
1695 kfree(tz->trip_temp_attrs);
1696 return -ENOMEM;
1697 }
1698 }
1699
1700
1701 for (indx = 0; indx < tz->trips; indx++) {
1702 /* create trip type attribute */
1703 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1704 "trip_point_%d_type", indx);
1705
1706 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1707 tz->trip_type_attrs[indx].attr.attr.name =
1708 tz->trip_type_attrs[indx].name;
1709 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1710 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1711
1712 device_create_file(&tz->device,
1713 &tz->trip_type_attrs[indx].attr);
1714
1715 /* create trip temp attribute */
1716 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1717 "trip_point_%d_temp", indx);
1718
1719 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1720 tz->trip_temp_attrs[indx].attr.attr.name =
1721 tz->trip_temp_attrs[indx].name;
1722 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1723 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1724 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
1725 mask & (1 << indx)) {
1726 tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1727 tz->trip_temp_attrs[indx].attr.store =
1728 trip_point_temp_store;
1729 }
1730
1731 device_create_file(&tz->device,
1732 &tz->trip_temp_attrs[indx].attr);
1733
1734 /* create Optional trip hyst attribute */
1735 if (!tz->ops->get_trip_hyst)
1736 continue;
1737 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1738 "trip_point_%d_hyst", indx);
1739
1740 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1741 tz->trip_hyst_attrs[indx].attr.attr.name =
1742 tz->trip_hyst_attrs[indx].name;
1743 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1744 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1745 if (tz->ops->set_trip_hyst) {
1746 tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1747 tz->trip_hyst_attrs[indx].attr.store =
1748 trip_point_hyst_store;
1749 }
1750
1751 device_create_file(&tz->device,
1752 &tz->trip_hyst_attrs[indx].attr);
1753 }
1754 return 0;
1755}
1756
1757static void remove_trip_attrs(struct thermal_zone_device *tz)
1758{
1759 int indx;
1760
1761 for (indx = 0; indx < tz->trips; indx++) {
1762 device_remove_file(&tz->device,
1763 &tz->trip_type_attrs[indx].attr);
1764 device_remove_file(&tz->device,
1765 &tz->trip_temp_attrs[indx].attr);
1766 if (tz->ops->get_trip_hyst)
1767 device_remove_file(&tz->device,
1768 &tz->trip_hyst_attrs[indx].attr);
1769 }
1770 kfree(tz->trip_type_attrs);
1771 kfree(tz->trip_temp_attrs);
1772 kfree(tz->trip_hyst_attrs);
1773}
1774
1775/**
1776 * thermal_zone_device_register() - register a new thermal zone device
1777 * @type: the thermal zone device type
1778 * @trips: the number of trip points the thermal zone support
1779 * @mask: a bit string indicating the writeablility of trip points
1780 * @devdata: private device data
1781 * @ops: standard thermal zone device callbacks
1782 * @tzp: thermal zone platform parameters
1783 * @passive_delay: number of milliseconds to wait between polls when
1784 * performing passive cooling
1785 * @polling_delay: number of milliseconds to wait between polls when checking
1786 * whether trip points have been crossed (0 for interrupt
1787 * driven systems)
1788 *
1789 * This interface function adds a new thermal zone device (sensor) to
1790 * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1791 * thermal cooling devices registered at the same time.
1792 * thermal_zone_device_unregister() must be called when the device is no
1793 * longer needed. The passive cooling depends on the .get_trend() return value.
1794 *
1795 * Return: a pointer to the created struct thermal_zone_device or an
1796 * in case of error, an ERR_PTR. Caller must check return value with
1797 * IS_ERR*() helpers.
1798 */
1799struct thermal_zone_device *thermal_zone_device_register(const char *type,
1800 int trips, int mask, void *devdata,
1801 struct thermal_zone_device_ops *ops,
1802 struct thermal_zone_params *tzp,
1803 int passive_delay, int polling_delay)
1804{
1805 struct thermal_zone_device *tz;
1806 enum thermal_trip_type trip_type;
1807 int trip_temp;
1808 int result;
1809 int count;
1810 int passive = 0;
1811 struct thermal_governor *governor;
1812
1813 if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1814 return ERR_PTR(-EINVAL);
1815
1816 if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1817 return ERR_PTR(-EINVAL);
1818
1819 if (!ops)
1820 return ERR_PTR(-EINVAL);
1821
1822 if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1823 return ERR_PTR(-EINVAL);
1824
1825 tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1826 if (!tz)
1827 return ERR_PTR(-ENOMEM);
1828
1829 INIT_LIST_HEAD(&tz->thermal_instances);
1830 idr_init(&tz->idr);
1831 mutex_init(&tz->lock);
1832 result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1833 if (result) {
1834 kfree(tz);
1835 return ERR_PTR(result);
1836 }
1837
1838 strlcpy(tz->type, type ? : "", sizeof(tz->type));
1839 tz->ops = ops;
1840 tz->tzp = tzp;
1841 tz->device.class = &thermal_class;
1842 tz->devdata = devdata;
1843 tz->trips = trips;
1844 tz->passive_delay = passive_delay;
1845 tz->polling_delay = polling_delay;
1846 /* A new thermal zone needs to be updated anyway. */
1847 atomic_set(&tz->need_update, 1);
1848
1849 dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1850 result = device_register(&tz->device);
1851 if (result) {
1852 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1853 kfree(tz);
1854 return ERR_PTR(result);
1855 }
1856
1857 /* sys I/F */
1858 if (type) {
1859 result = device_create_file(&tz->device, &dev_attr_type);
1860 if (result)
1861 goto unregister;
1862 }
1863
1864 result = device_create_file(&tz->device, &dev_attr_temp);
1865 if (result)
1866 goto unregister;
1867
1868 if (ops->get_mode) {
1869 result = device_create_file(&tz->device, &dev_attr_mode);
1870 if (result)
1871 goto unregister;
1872 }
1873
1874 result = create_trip_attrs(tz, mask);
1875 if (result)
1876 goto unregister;
1877
1878 for (count = 0; count < trips; count++) {
1879 if (tz->ops->get_trip_type(tz, count, &trip_type))
1880 set_bit(count, &tz->trips_disabled);
1881 if (trip_type == THERMAL_TRIP_PASSIVE)
1882 passive = 1;
1883 if (tz->ops->get_trip_temp(tz, count, &trip_temp))
1884 set_bit(count, &tz->trips_disabled);
1885 /* Check for bogus trip points */
1886 if (trip_temp == 0)
1887 set_bit(count, &tz->trips_disabled);
1888 }
1889
1890 if (!passive) {
1891 result = device_create_file(&tz->device, &dev_attr_passive);
1892 if (result)
1893 goto unregister;
1894 }
1895
1896 if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) {
1897 result = device_create_file(&tz->device, &dev_attr_emul_temp);
1898 if (result)
1899 goto unregister;
1900 }
1901
1902 /* Create policy attribute */
1903 result = device_create_file(&tz->device, &dev_attr_policy);
1904 if (result)
1905 goto unregister;
1906
1907 /* Add thermal zone params */
1908 result = create_tzp_attrs(&tz->device);
1909 if (result)
1910 goto unregister;
1911
1912 /* Create available_policies attribute */
1913 result = device_create_file(&tz->device, &dev_attr_available_policies);
1914 if (result)
1915 goto unregister;
1916
1917 /* Update 'this' zone's governor information */
1918 mutex_lock(&thermal_governor_lock);
1919
1920 if (tz->tzp)
1921 governor = __find_governor(tz->tzp->governor_name);
1922 else
1923 governor = def_governor;
1924
1925 result = thermal_set_governor(tz, governor);
1926 if (result) {
1927 mutex_unlock(&thermal_governor_lock);
1928 goto unregister;
1929 }
1930
1931 mutex_unlock(&thermal_governor_lock);
1932
1933 if (!tz->tzp || !tz->tzp->no_hwmon) {
1934 result = thermal_add_hwmon_sysfs(tz);
1935 if (result)
1936 goto unregister;
1937 }
1938
1939 mutex_lock(&thermal_list_lock);
1940 list_add_tail(&tz->node, &thermal_tz_list);
1941 mutex_unlock(&thermal_list_lock);
1942
1943 /* Bind cooling devices for this zone */
1944 bind_tz(tz);
1945
1946 INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1947
1948 thermal_zone_device_reset(tz);
1949 /* Update the new thermal zone and mark it as already updated. */
1950 if (atomic_cmpxchg(&tz->need_update, 1, 0))
1951 thermal_zone_device_update(tz);
1952
1953 return tz;
1954
1955unregister:
1956 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1957 device_unregister(&tz->device);
1958 return ERR_PTR(result);
1959}
1960EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1961
1962/**
1963 * thermal_device_unregister - removes the registered thermal zone device
1964 * @tz: the thermal zone device to remove
1965 */
1966void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1967{
1968 int i;
1969 const struct thermal_zone_params *tzp;
1970 struct thermal_cooling_device *cdev;
1971 struct thermal_zone_device *pos = NULL;
1972
1973 if (!tz)
1974 return;
1975
1976 tzp = tz->tzp;
1977
1978 mutex_lock(&thermal_list_lock);
1979 list_for_each_entry(pos, &thermal_tz_list, node)
1980 if (pos == tz)
1981 break;
1982 if (pos != tz) {
1983 /* thermal zone device not found */
1984 mutex_unlock(&thermal_list_lock);
1985 return;
1986 }
1987 list_del(&tz->node);
1988
1989 /* Unbind all cdevs associated with 'this' thermal zone */
1990 list_for_each_entry(cdev, &thermal_cdev_list, node) {
1991 if (tz->ops->unbind) {
1992 tz->ops->unbind(tz, cdev);
1993 continue;
1994 }
1995
1996 if (!tzp || !tzp->tbp)
1997 break;
1998
1999 for (i = 0; i < tzp->num_tbps; i++) {
2000 if (tzp->tbp[i].cdev == cdev) {
2001 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
2002 tzp->tbp[i].cdev = NULL;
2003 }
2004 }
2005 }
2006
2007 mutex_unlock(&thermal_list_lock);
2008
2009 thermal_zone_device_set_polling(tz, 0);
2010
2011 if (tz->type[0])
2012 device_remove_file(&tz->device, &dev_attr_type);
2013 device_remove_file(&tz->device, &dev_attr_temp);
2014 if (tz->ops->get_mode)
2015 device_remove_file(&tz->device, &dev_attr_mode);
2016 device_remove_file(&tz->device, &dev_attr_policy);
2017 device_remove_file(&tz->device, &dev_attr_available_policies);
2018 remove_trip_attrs(tz);
2019 thermal_set_governor(tz, NULL);
2020
2021 thermal_remove_hwmon_sysfs(tz);
2022 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
2023 idr_destroy(&tz->idr);
2024 mutex_destroy(&tz->lock);
2025 device_unregister(&tz->device);
2026 return;
2027}
2028EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
2029
2030/**
2031 * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
2032 * @name: thermal zone name to fetch the temperature
2033 *
2034 * When only one zone is found with the passed name, returns a reference to it.
2035 *
2036 * Return: On success returns a reference to an unique thermal zone with
2037 * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
2038 * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
2039 */
2040struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
2041{
2042 struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
2043 unsigned int found = 0;
2044
2045 if (!name)
2046 goto exit;
2047
2048 mutex_lock(&thermal_list_lock);
2049 list_for_each_entry(pos, &thermal_tz_list, node)
2050 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
2051 found++;
2052 ref = pos;
2053 }
2054 mutex_unlock(&thermal_list_lock);
2055
2056 /* nothing has been found, thus an error code for it */
2057 if (found == 0)
2058 ref = ERR_PTR(-ENODEV);
2059 else if (found > 1)
2060 /* Success only when an unique zone is found */
2061 ref = ERR_PTR(-EEXIST);
2062
2063exit:
2064 return ref;
2065}
2066EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
2067
2068#ifdef CONFIG_NET
2069static const struct genl_multicast_group thermal_event_mcgrps[] = {
2070 { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
2071};
2072
2073static struct genl_family thermal_event_genl_family = {
2074 .id = GENL_ID_GENERATE,
2075 .name = THERMAL_GENL_FAMILY_NAME,
2076 .version = THERMAL_GENL_VERSION,
2077 .maxattr = THERMAL_GENL_ATTR_MAX,
2078 .mcgrps = thermal_event_mcgrps,
2079 .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
2080};
2081
2082int thermal_generate_netlink_event(struct thermal_zone_device *tz,
2083 enum events event)
2084{
2085 struct sk_buff *skb;
2086 struct nlattr *attr;
2087 struct thermal_genl_event *thermal_event;
2088 void *msg_header;
2089 int size;
2090 int result;
2091 static unsigned int thermal_event_seqnum;
2092
2093 if (!tz)
2094 return -EINVAL;
2095
2096 /* allocate memory */
2097 size = nla_total_size(sizeof(struct thermal_genl_event)) +
2098 nla_total_size(0);
2099
2100 skb = genlmsg_new(size, GFP_ATOMIC);
2101 if (!skb)
2102 return -ENOMEM;
2103
2104 /* add the genetlink message header */
2105 msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
2106 &thermal_event_genl_family, 0,
2107 THERMAL_GENL_CMD_EVENT);
2108 if (!msg_header) {
2109 nlmsg_free(skb);
2110 return -ENOMEM;
2111 }
2112
2113 /* fill the data */
2114 attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
2115 sizeof(struct thermal_genl_event));
2116
2117 if (!attr) {
2118 nlmsg_free(skb);
2119 return -EINVAL;
2120 }
2121
2122 thermal_event = nla_data(attr);
2123 if (!thermal_event) {
2124 nlmsg_free(skb);
2125 return -EINVAL;
2126 }
2127
2128 memset(thermal_event, 0, sizeof(struct thermal_genl_event));
2129
2130 thermal_event->orig = tz->id;
2131 thermal_event->event = event;
2132
2133 /* send multicast genetlink message */
2134 genlmsg_end(skb, msg_header);
2135
2136 result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
2137 0, GFP_ATOMIC);
2138 if (result)
2139 dev_err(&tz->device, "Failed to send netlink event:%d", result);
2140
2141 return result;
2142}
2143EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
2144
2145static int genetlink_init(void)
2146{
2147 return genl_register_family(&thermal_event_genl_family);
2148}
2149
2150static void genetlink_exit(void)
2151{
2152 genl_unregister_family(&thermal_event_genl_family);
2153}
2154#else /* !CONFIG_NET */
2155static inline int genetlink_init(void) { return 0; }
2156static inline void genetlink_exit(void) {}
2157#endif /* !CONFIG_NET */
2158
2159static int __init thermal_register_governors(void)
2160{
2161 int result;
2162
2163 result = thermal_gov_step_wise_register();
2164 if (result)
2165 return result;
2166
2167 result = thermal_gov_fair_share_register();
2168 if (result)
2169 return result;
2170
2171 result = thermal_gov_bang_bang_register();
2172 if (result)
2173 return result;
2174
2175 result = thermal_gov_user_space_register();
2176 if (result)
2177 return result;
2178
2179 return thermal_gov_power_allocator_register();
2180}
2181
2182static void thermal_unregister_governors(void)
2183{
2184 thermal_gov_step_wise_unregister();
2185 thermal_gov_fair_share_unregister();
2186 thermal_gov_bang_bang_unregister();
2187 thermal_gov_user_space_unregister();
2188 thermal_gov_power_allocator_unregister();
2189}
2190
2191static int thermal_pm_notify(struct notifier_block *nb,
2192 unsigned long mode, void *_unused)
2193{
2194 struct thermal_zone_device *tz;
2195
2196 switch (mode) {
2197 case PM_HIBERNATION_PREPARE:
2198 case PM_RESTORE_PREPARE:
2199 case PM_SUSPEND_PREPARE:
2200 atomic_set(&in_suspend, 1);
2201 break;
2202 case PM_POST_HIBERNATION:
2203 case PM_POST_RESTORE:
2204 case PM_POST_SUSPEND:
2205 atomic_set(&in_suspend, 0);
2206 list_for_each_entry(tz, &thermal_tz_list, node) {
2207 thermal_zone_device_reset(tz);
2208 thermal_zone_device_update(tz);
2209 }
2210 break;
2211 default:
2212 break;
2213 }
2214 return 0;
2215}
2216
2217static struct notifier_block thermal_pm_nb = {
2218 .notifier_call = thermal_pm_notify,
2219};
2220
2221static int __init thermal_init(void)
2222{
2223 int result;
2224
2225 result = thermal_register_governors();
2226 if (result)
2227 goto error;
2228
2229 result = class_register(&thermal_class);
2230 if (result)
2231 goto unregister_governors;
2232
2233 result = genetlink_init();
2234 if (result)
2235 goto unregister_class;
2236
2237 result = of_parse_thermal_zones();
2238 if (result)
2239 goto exit_netlink;
2240
2241 result = register_pm_notifier(&thermal_pm_nb);
2242 if (result)
2243 pr_warn("Thermal: Can not register suspend notifier, return %d\n",
2244 result);
2245
2246 return 0;
2247
2248exit_netlink:
2249 genetlink_exit();
2250unregister_class:
2251 class_unregister(&thermal_class);
2252unregister_governors:
2253 thermal_unregister_governors();
2254error:
2255 idr_destroy(&thermal_tz_idr);
2256 idr_destroy(&thermal_cdev_idr);
2257 mutex_destroy(&thermal_idr_lock);
2258 mutex_destroy(&thermal_list_lock);
2259 mutex_destroy(&thermal_governor_lock);
2260 return result;
2261}
2262
2263static void __exit thermal_exit(void)
2264{
2265 unregister_pm_notifier(&thermal_pm_nb);
2266 of_thermal_destroy_zones();
2267 genetlink_exit();
2268 class_unregister(&thermal_class);
2269 thermal_unregister_governors();
2270 idr_destroy(&thermal_tz_idr);
2271 idr_destroy(&thermal_cdev_idr);
2272 mutex_destroy(&thermal_idr_lock);
2273 mutex_destroy(&thermal_list_lock);
2274 mutex_destroy(&thermal_governor_lock);
2275}
2276
2277fs_initcall(thermal_init);
2278module_exit(thermal_exit);