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of: MSI: Simplify irqdomain lookup
[linux/fpc-iii.git] / drivers / thermal / thermal_core.c
blobd9e525cc9c1ce24bcd9d55dd59730f375b15d552
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
41 #define CREATE_TRACE_POINTS
42 #include <trace/events/thermal.h>
43
44 #include "thermal_core.h"
45 #include "thermal_hwmon.h"
46
47 MODULE_AUTHOR("Zhang Rui");
48 MODULE_DESCRIPTION("Generic thermal management sysfs support");
49 MODULE_LICENSE("GPL v2");
50
51 static DEFINE_IDR(thermal_tz_idr);
52 static DEFINE_IDR(thermal_cdev_idr);
53 static DEFINE_MUTEX(thermal_idr_lock);
54
55 static LIST_HEAD(thermal_tz_list);
56 static LIST_HEAD(thermal_cdev_list);
57 static LIST_HEAD(thermal_governor_list);
58
59 static DEFINE_MUTEX(thermal_list_lock);
60 static DEFINE_MUTEX(thermal_governor_lock);
61
62 static struct thermal_governor *def_governor;
63
64 static struct thermal_governor *__find_governor(const char *name)
65 {
66 struct thermal_governor *pos;
67
68 if (!name || !name[0])
69 return def_governor;
70
71 list_for_each_entry(pos, &thermal_governor_list, governor_list)
72 if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH))
73 return pos;
74
75 return NULL;
76 }
77
78 /**
79 * bind_previous_governor() - bind the previous governor of the thermal zone
80 * @tz: a valid pointer to a struct thermal_zone_device
81 * @failed_gov_name: the name of the governor that failed to register
82 *
83 * Register the previous governor of the thermal zone after a new
84 * governor has failed to be bound.
85 */
86 static void bind_previous_governor(struct thermal_zone_device *tz,
87 const char *failed_gov_name)
88 {
89 if (tz->governor && tz->governor->bind_to_tz) {
90 if (tz->governor->bind_to_tz(tz)) {
91 dev_err(&tz->device,
92 "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n",
93 failed_gov_name, tz->governor->name, tz->type);
94 tz->governor = NULL;
95 }
96 }
97 }
98
99 /**
100 * thermal_set_governor() - Switch to another governor
101 * @tz: a valid pointer to a struct thermal_zone_device
102 * @new_gov: pointer to the new governor
103 *
104 * Change the governor of thermal zone @tz.
105 *
106 * Return: 0 on success, an error if the new governor's bind_to_tz() failed.
107 */
108 static int thermal_set_governor(struct thermal_zone_device *tz,
109 struct thermal_governor *new_gov)
110 {
111 int ret = 0;
112
113 if (tz->governor && tz->governor->unbind_from_tz)
114 tz->governor->unbind_from_tz(tz);
115
116 if (new_gov && new_gov->bind_to_tz) {
117 ret = new_gov->bind_to_tz(tz);
118 if (ret) {
119 bind_previous_governor(tz, new_gov->name);
120
121 return ret;
122 }
123 }
124
125 tz->governor = new_gov;
126
127 return ret;
128 }
129
130 int thermal_register_governor(struct thermal_governor *governor)
131 {
132 int err;
133 const char *name;
134 struct thermal_zone_device *pos;
135
136 if (!governor)
137 return -EINVAL;
138
139 mutex_lock(&thermal_governor_lock);
140
141 err = -EBUSY;
142 if (__find_governor(governor->name) == NULL) {
143 err = 0;
144 list_add(&governor->governor_list, &thermal_governor_list);
145 if (!def_governor && !strncmp(governor->name,
146 DEFAULT_THERMAL_GOVERNOR, THERMAL_NAME_LENGTH))
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
179 void 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) == NULL)
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);
201 exit:
202 mutex_unlock(&thermal_governor_lock);
203 return;
204 }
205
206 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
207 {
208 int ret;
209
210 if (lock)
211 mutex_lock(lock);
212 ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
213 if (lock)
214 mutex_unlock(lock);
215 if (unlikely(ret < 0))
216 return ret;
217 *id = ret;
218 return 0;
219 }
220
221 static void release_idr(struct idr *idr, struct mutex *lock, int id)
222 {
223 if (lock)
224 mutex_lock(lock);
225 idr_remove(idr, id);
226 if (lock)
227 mutex_unlock(lock);
228 }
229
230 int get_tz_trend(struct thermal_zone_device *tz, int trip)
231 {
232 enum thermal_trend trend;
233
234 if (tz->emul_temperature || !tz->ops->get_trend ||
235 tz->ops->get_trend(tz, trip, &trend)) {
236 if (tz->temperature > tz->last_temperature)
237 trend = THERMAL_TREND_RAISING;
238 else if (tz->temperature < tz->last_temperature)
239 trend = THERMAL_TREND_DROPPING;
240 else
241 trend = THERMAL_TREND_STABLE;
242 }
243
244 return trend;
245 }
246 EXPORT_SYMBOL(get_tz_trend);
247
248 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
249 struct thermal_cooling_device *cdev, int trip)
250 {
251 struct thermal_instance *pos = NULL;
252 struct thermal_instance *target_instance = NULL;
253
254 mutex_lock(&tz->lock);
255 mutex_lock(&cdev->lock);
256
257 list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
258 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
259 target_instance = pos;
260 break;
261 }
262 }
263
264 mutex_unlock(&cdev->lock);
265 mutex_unlock(&tz->lock);
266
267 return target_instance;
268 }
269 EXPORT_SYMBOL(get_thermal_instance);
270
271 static void print_bind_err_msg(struct thermal_zone_device *tz,
272 struct thermal_cooling_device *cdev, int ret)
273 {
274 dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
275 tz->type, cdev->type, ret);
276 }
277
278 static void __bind(struct thermal_zone_device *tz, int mask,
279 struct thermal_cooling_device *cdev,
280 unsigned long *limits,
281 unsigned int weight)
282 {
283 int i, ret;
284
285 for (i = 0; i < tz->trips; i++) {
286 if (mask & (1 << i)) {
287 unsigned long upper, lower;
288
289 upper = THERMAL_NO_LIMIT;
290 lower = THERMAL_NO_LIMIT;
291 if (limits) {
292 lower = limits[i * 2];
293 upper = limits[i * 2 + 1];
294 }
295 ret = thermal_zone_bind_cooling_device(tz, i, cdev,
296 upper, lower,
297 weight);
298 if (ret)
299 print_bind_err_msg(tz, cdev, ret);
300 }
301 }
302 }
303
304 static void __unbind(struct thermal_zone_device *tz, int mask,
305 struct thermal_cooling_device *cdev)
306 {
307 int i;
308
309 for (i = 0; i < tz->trips; i++)
310 if (mask & (1 << i))
311 thermal_zone_unbind_cooling_device(tz, i, cdev);
312 }
313
314 static void bind_cdev(struct thermal_cooling_device *cdev)
315 {
316 int i, ret;
317 const struct thermal_zone_params *tzp;
318 struct thermal_zone_device *pos = NULL;
319
320 mutex_lock(&thermal_list_lock);
321
322 list_for_each_entry(pos, &thermal_tz_list, node) {
323 if (!pos->tzp && !pos->ops->bind)
324 continue;
325
326 if (pos->ops->bind) {
327 ret = pos->ops->bind(pos, cdev);
328 if (ret)
329 print_bind_err_msg(pos, cdev, ret);
330 continue;
331 }
332
333 tzp = pos->tzp;
334 if (!tzp || !tzp->tbp)
335 continue;
336
337 for (i = 0; i < tzp->num_tbps; i++) {
338 if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
339 continue;
340 if (tzp->tbp[i].match(pos, cdev))
341 continue;
342 tzp->tbp[i].cdev = cdev;
343 __bind(pos, tzp->tbp[i].trip_mask, cdev,
344 tzp->tbp[i].binding_limits,
345 tzp->tbp[i].weight);
346 }
347 }
348
349 mutex_unlock(&thermal_list_lock);
350 }
351
352 static void bind_tz(struct thermal_zone_device *tz)
353 {
354 int i, ret;
355 struct thermal_cooling_device *pos = NULL;
356 const struct thermal_zone_params *tzp = tz->tzp;
357
358 if (!tzp && !tz->ops->bind)
359 return;
360
361 mutex_lock(&thermal_list_lock);
362
363 /* If there is ops->bind, try to use ops->bind */
364 if (tz->ops->bind) {
365 list_for_each_entry(pos, &thermal_cdev_list, node) {
366 ret = tz->ops->bind(tz, pos);
367 if (ret)
368 print_bind_err_msg(tz, pos, ret);
369 }
370 goto exit;
371 }
372
373 if (!tzp || !tzp->tbp)
374 goto exit;
375
376 list_for_each_entry(pos, &thermal_cdev_list, node) {
377 for (i = 0; i < tzp->num_tbps; i++) {
378 if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
379 continue;
380 if (tzp->tbp[i].match(tz, pos))
381 continue;
382 tzp->tbp[i].cdev = pos;
383 __bind(tz, tzp->tbp[i].trip_mask, pos,
384 tzp->tbp[i].binding_limits,
385 tzp->tbp[i].weight);
386 }
387 }
388 exit:
389 mutex_unlock(&thermal_list_lock);
390 }
391
392 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
393 int delay)
394 {
395 if (delay > 1000)
396 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
397 round_jiffies(msecs_to_jiffies(delay)));
398 else if (delay)
399 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
400 msecs_to_jiffies(delay));
401 else
402 cancel_delayed_work(&tz->poll_queue);
403 }
404
405 static void monitor_thermal_zone(struct thermal_zone_device *tz)
406 {
407 mutex_lock(&tz->lock);
408
409 if (tz->passive)
410 thermal_zone_device_set_polling(tz, tz->passive_delay);
411 else if (tz->polling_delay)
412 thermal_zone_device_set_polling(tz, tz->polling_delay);
413 else
414 thermal_zone_device_set_polling(tz, 0);
415
416 mutex_unlock(&tz->lock);
417 }
418
419 static void handle_non_critical_trips(struct thermal_zone_device *tz,
420 int trip, enum thermal_trip_type trip_type)
421 {
422 tz->governor ? tz->governor->throttle(tz, trip) :
423 def_governor->throttle(tz, trip);
424 }
425
426 static void handle_critical_trips(struct thermal_zone_device *tz,
427 int trip, enum thermal_trip_type trip_type)
428 {
429 int trip_temp;
430
431 tz->ops->get_trip_temp(tz, trip, &trip_temp);
432
433 /* If we have not crossed the trip_temp, we do not care. */
434 if (trip_temp <= 0 || tz->temperature < trip_temp)
435 return;
436
437 trace_thermal_zone_trip(tz, trip, trip_type);
438
439 if (tz->ops->notify)
440 tz->ops->notify(tz, trip, trip_type);
441
442 if (trip_type == THERMAL_TRIP_CRITICAL) {
443 dev_emerg(&tz->device,
444 "critical temperature reached(%d C),shutting down\n",
445 tz->temperature / 1000);
446 orderly_poweroff(true);
447 }
448 }
449
450 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
451 {
452 enum thermal_trip_type type;
453
454 tz->ops->get_trip_type(tz, trip, &type);
455
456 if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
457 handle_critical_trips(tz, trip, type);
458 else
459 handle_non_critical_trips(tz, trip, type);
460 /*
461 * Alright, we handled this trip successfully.
462 * So, start monitoring again.
463 */
464 monitor_thermal_zone(tz);
465 }
466
467 /**
468 * thermal_zone_get_temp() - returns the temperature of a thermal zone
469 * @tz: a valid pointer to a struct thermal_zone_device
470 * @temp: a valid pointer to where to store the resulting temperature.
471 *
472 * When a valid thermal zone reference is passed, it will fetch its
473 * temperature and fill @temp.
474 *
475 * Return: On success returns 0, an error code otherwise
476 */
477 int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
478 {
479 int ret = -EINVAL;
480 int count;
481 int crit_temp = INT_MAX;
482 enum thermal_trip_type type;
483
484 if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
485 goto exit;
486
487 mutex_lock(&tz->lock);
488
489 ret = tz->ops->get_temp(tz, temp);
490
491 if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {
492 for (count = 0; count < tz->trips; count++) {
493 ret = tz->ops->get_trip_type(tz, count, &type);
494 if (!ret && type == THERMAL_TRIP_CRITICAL) {
495 ret = tz->ops->get_trip_temp(tz, count,
496 &crit_temp);
497 break;
498 }
499 }
500
501 /*
502 * Only allow emulating a temperature when the real temperature
503 * is below the critical temperature so that the emulation code
504 * cannot hide critical conditions.
505 */
506 if (!ret && *temp < crit_temp)
507 *temp = tz->emul_temperature;
508 }
509
510 mutex_unlock(&tz->lock);
511 exit:
512 return ret;
513 }
514 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
515
516 static void update_temperature(struct thermal_zone_device *tz)
517 {
518 int temp, ret;
519
520 ret = thermal_zone_get_temp(tz, &temp);
521 if (ret) {
522 if (ret != -EAGAIN)
523 dev_warn(&tz->device,
524 "failed to read out thermal zone (%d)\n",
525 ret);
526 return;
527 }
528
529 mutex_lock(&tz->lock);
530 tz->last_temperature = tz->temperature;
531 tz->temperature = temp;
532 mutex_unlock(&tz->lock);
533
534 trace_thermal_temperature(tz);
535 dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
536 tz->last_temperature, tz->temperature);
537 }
538
539 void thermal_zone_device_update(struct thermal_zone_device *tz)
540 {
541 int count;
542
543 if (!tz->ops->get_temp)
544 return;
545
546 update_temperature(tz);
547
548 for (count = 0; count < tz->trips; count++)
549 handle_thermal_trip(tz, count);
550 }
551 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
552
553 static void thermal_zone_device_check(struct work_struct *work)
554 {
555 struct thermal_zone_device *tz = container_of(work, struct
556 thermal_zone_device,
557 poll_queue.work);
558 thermal_zone_device_update(tz);
559 }
560
561 /* sys I/F for thermal zone */
562
563 #define to_thermal_zone(_dev) \
564 container_of(_dev, struct thermal_zone_device, device)
565
566 static ssize_t
567 type_show(struct device *dev, struct device_attribute *attr, char *buf)
568 {
569 struct thermal_zone_device *tz = to_thermal_zone(dev);
570
571 return sprintf(buf, "%s\n", tz->type);
572 }
573
574 static ssize_t
575 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
576 {
577 struct thermal_zone_device *tz = to_thermal_zone(dev);
578 int temperature, ret;
579
580 ret = thermal_zone_get_temp(tz, &temperature);
581
582 if (ret)
583 return ret;
584
585 return sprintf(buf, "%d\n", temperature);
586 }
587
588 static ssize_t
589 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
590 {
591 struct thermal_zone_device *tz = to_thermal_zone(dev);
592 enum thermal_device_mode mode;
593 int result;
594
595 if (!tz->ops->get_mode)
596 return -EPERM;
597
598 result = tz->ops->get_mode(tz, &mode);
599 if (result)
600 return result;
601
602 return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
603 : "disabled");
604 }
605
606 static ssize_t
607 mode_store(struct device *dev, struct device_attribute *attr,
608 const char *buf, size_t count)
609 {
610 struct thermal_zone_device *tz = to_thermal_zone(dev);
611 int result;
612
613 if (!tz->ops->set_mode)
614 return -EPERM;
615
616 if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
617 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
618 else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
619 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
620 else
621 result = -EINVAL;
622
623 if (result)
624 return result;
625
626 return count;
627 }
628
629 static ssize_t
630 trip_point_type_show(struct device *dev, struct device_attribute *attr,
631 char *buf)
632 {
633 struct thermal_zone_device *tz = to_thermal_zone(dev);
634 enum thermal_trip_type type;
635 int trip, result;
636
637 if (!tz->ops->get_trip_type)
638 return -EPERM;
639
640 if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
641 return -EINVAL;
642
643 result = tz->ops->get_trip_type(tz, trip, &type);
644 if (result)
645 return result;
646
647 switch (type) {
648 case THERMAL_TRIP_CRITICAL:
649 return sprintf(buf, "critical\n");
650 case THERMAL_TRIP_HOT:
651 return sprintf(buf, "hot\n");
652 case THERMAL_TRIP_PASSIVE:
653 return sprintf(buf, "passive\n");
654 case THERMAL_TRIP_ACTIVE:
655 return sprintf(buf, "active\n");
656 default:
657 return sprintf(buf, "unknown\n");
658 }
659 }
660
661 static ssize_t
662 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
663 const char *buf, size_t count)
664 {
665 struct thermal_zone_device *tz = to_thermal_zone(dev);
666 int trip, ret;
667 unsigned long temperature;
668
669 if (!tz->ops->set_trip_temp)
670 return -EPERM;
671
672 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
673 return -EINVAL;
674
675 if (kstrtoul(buf, 10, &temperature))
676 return -EINVAL;
677
678 ret = tz->ops->set_trip_temp(tz, trip, temperature);
679
680 return ret ? ret : count;
681 }
682
683 static ssize_t
684 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
685 char *buf)
686 {
687 struct thermal_zone_device *tz = to_thermal_zone(dev);
688 int trip, ret;
689 int temperature;
690
691 if (!tz->ops->get_trip_temp)
692 return -EPERM;
693
694 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
695 return -EINVAL;
696
697 ret = tz->ops->get_trip_temp(tz, trip, &temperature);
698
699 if (ret)
700 return ret;
701
702 return sprintf(buf, "%d\n", temperature);
703 }
704
705 static ssize_t
706 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
707 const char *buf, size_t count)
708 {
709 struct thermal_zone_device *tz = to_thermal_zone(dev);
710 int trip, ret;
711 int temperature;
712
713 if (!tz->ops->set_trip_hyst)
714 return -EPERM;
715
716 if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
717 return -EINVAL;
718
719 if (kstrtoint(buf, 10, &temperature))
720 return -EINVAL;
721
722 /*
723 * We are not doing any check on the 'temperature' value
724 * here. The driver implementing 'set_trip_hyst' has to
725 * take care of this.
726 */
727 ret = tz->ops->set_trip_hyst(tz, trip, temperature);
728
729 return ret ? ret : count;
730 }
731
732 static ssize_t
733 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
734 char *buf)
735 {
736 struct thermal_zone_device *tz = to_thermal_zone(dev);
737 int trip, ret;
738 int temperature;
739
740 if (!tz->ops->get_trip_hyst)
741 return -EPERM;
742
743 if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
744 return -EINVAL;
745
746 ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
747
748 return ret ? ret : sprintf(buf, "%d\n", temperature);
749 }
750
751 static ssize_t
752 passive_store(struct device *dev, struct device_attribute *attr,
753 const char *buf, size_t count)
754 {
755 struct thermal_zone_device *tz = to_thermal_zone(dev);
756 struct thermal_cooling_device *cdev = NULL;
757 int state;
758
759 if (!sscanf(buf, "%d\n", &state))
760 return -EINVAL;
761
762 /* sanity check: values below 1000 millicelcius don't make sense
763 * and can cause the system to go into a thermal heart attack
764 */
765 if (state && state < 1000)
766 return -EINVAL;
767
768 if (state && !tz->forced_passive) {
769 mutex_lock(&thermal_list_lock);
770 list_for_each_entry(cdev, &thermal_cdev_list, node) {
771 if (!strncmp("Processor", cdev->type,
772 sizeof("Processor")))
773 thermal_zone_bind_cooling_device(tz,
774 THERMAL_TRIPS_NONE, cdev,
775 THERMAL_NO_LIMIT,
776 THERMAL_NO_LIMIT,
777 THERMAL_WEIGHT_DEFAULT);
778 }
779 mutex_unlock(&thermal_list_lock);
780 if (!tz->passive_delay)
781 tz->passive_delay = 1000;
782 } else if (!state && tz->forced_passive) {
783 mutex_lock(&thermal_list_lock);
784 list_for_each_entry(cdev, &thermal_cdev_list, node) {
785 if (!strncmp("Processor", cdev->type,
786 sizeof("Processor")))
787 thermal_zone_unbind_cooling_device(tz,
788 THERMAL_TRIPS_NONE,
789 cdev);
790 }
791 mutex_unlock(&thermal_list_lock);
792 tz->passive_delay = 0;
793 }
794
795 tz->forced_passive = state;
796
797 thermal_zone_device_update(tz);
798
799 return count;
800 }
801
802 static ssize_t
803 passive_show(struct device *dev, struct device_attribute *attr,
804 char *buf)
805 {
806 struct thermal_zone_device *tz = to_thermal_zone(dev);
807
808 return sprintf(buf, "%d\n", tz->forced_passive);
809 }
810
811 static ssize_t
812 policy_store(struct device *dev, struct device_attribute *attr,
813 const char *buf, size_t count)
814 {
815 int ret = -EINVAL;
816 struct thermal_zone_device *tz = to_thermal_zone(dev);
817 struct thermal_governor *gov;
818 char name[THERMAL_NAME_LENGTH];
819
820 snprintf(name, sizeof(name), "%s", buf);
821
822 mutex_lock(&thermal_governor_lock);
823 mutex_lock(&tz->lock);
824
825 gov = __find_governor(strim(name));
826 if (!gov)
827 goto exit;
828
829 ret = thermal_set_governor(tz, gov);
830 if (!ret)
831 ret = count;
832
833 exit:
834 mutex_unlock(&tz->lock);
835 mutex_unlock(&thermal_governor_lock);
836 return ret;
837 }
838
839 static ssize_t
840 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
841 {
842 struct thermal_zone_device *tz = to_thermal_zone(dev);
843
844 return sprintf(buf, "%s\n", tz->governor->name);
845 }
846
847 static ssize_t
848 available_policies_show(struct device *dev, struct device_attribute *devattr,
849 char *buf)
850 {
851 struct thermal_governor *pos;
852 ssize_t count = 0;
853 ssize_t size = PAGE_SIZE;
854
855 mutex_lock(&thermal_governor_lock);
856
857 list_for_each_entry(pos, &thermal_governor_list, governor_list) {
858 size = PAGE_SIZE - count;
859 count += scnprintf(buf + count, size, "%s ", pos->name);
860 }
861 count += scnprintf(buf + count, size, "\n");
862
863 mutex_unlock(&thermal_governor_lock);
864
865 return count;
866 }
867
868 static ssize_t
869 emul_temp_store(struct device *dev, struct device_attribute *attr,
870 const char *buf, size_t count)
871 {
872 struct thermal_zone_device *tz = to_thermal_zone(dev);
873 int ret = 0;
874 unsigned long temperature;
875
876 if (kstrtoul(buf, 10, &temperature))
877 return -EINVAL;
878
879 if (!tz->ops->set_emul_temp) {
880 mutex_lock(&tz->lock);
881 tz->emul_temperature = temperature;
882 mutex_unlock(&tz->lock);
883 } else {
884 ret = tz->ops->set_emul_temp(tz, temperature);
885 }
886
887 if (!ret)
888 thermal_zone_device_update(tz);
889
890 return ret ? ret : count;
891 }
892 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
893
894 static ssize_t
895 sustainable_power_show(struct device *dev, struct device_attribute *devattr,
896 char *buf)
897 {
898 struct thermal_zone_device *tz = to_thermal_zone(dev);
899
900 if (tz->tzp)
901 return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
902 else
903 return -EIO;
904 }
905
906 static ssize_t
907 sustainable_power_store(struct device *dev, struct device_attribute *devattr,
908 const char *buf, size_t count)
909 {
910 struct thermal_zone_device *tz = to_thermal_zone(dev);
911 u32 sustainable_power;
912
913 if (!tz->tzp)
914 return -EIO;
915
916 if (kstrtou32(buf, 10, &sustainable_power))
917 return -EINVAL;
918
919 tz->tzp->sustainable_power = sustainable_power;
920
921 return count;
922 }
923 static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
924 sustainable_power_store);
925
926 #define create_s32_tzp_attr(name) \
927 static ssize_t \
928 name##_show(struct device *dev, struct device_attribute *devattr, \
929 char *buf) \
930 { \
931 struct thermal_zone_device *tz = to_thermal_zone(dev); \
932 \
933 if (tz->tzp) \
934 return sprintf(buf, "%u\n", tz->tzp->name); \
935 else \
936 return -EIO; \
937 } \
938 \
939 static ssize_t \
940 name##_store(struct device *dev, struct device_attribute *devattr, \
941 const char *buf, size_t count) \
942 { \
943 struct thermal_zone_device *tz = to_thermal_zone(dev); \
944 s32 value; \
945 \
946 if (!tz->tzp) \
947 return -EIO; \
948 \
949 if (kstrtos32(buf, 10, &value)) \
950 return -EINVAL; \
951 \
952 tz->tzp->name = value; \
953 \
954 return count; \
955 } \
956 static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
957
958 create_s32_tzp_attr(k_po);
959 create_s32_tzp_attr(k_pu);
960 create_s32_tzp_attr(k_i);
961 create_s32_tzp_attr(k_d);
962 create_s32_tzp_attr(integral_cutoff);
963 create_s32_tzp_attr(slope);
964 create_s32_tzp_attr(offset);
965 #undef create_s32_tzp_attr
966
967 static struct device_attribute *dev_tzp_attrs[] = {
968 &dev_attr_sustainable_power,
969 &dev_attr_k_po,
970 &dev_attr_k_pu,
971 &dev_attr_k_i,
972 &dev_attr_k_d,
973 &dev_attr_integral_cutoff,
974 &dev_attr_slope,
975 &dev_attr_offset,
976 };
977
978 static int create_tzp_attrs(struct device *dev)
979 {
980 int i;
981
982 for (i = 0; i < ARRAY_SIZE(dev_tzp_attrs); i++) {
983 int ret;
984 struct device_attribute *dev_attr = dev_tzp_attrs[i];
985
986 ret = device_create_file(dev, dev_attr);
987 if (ret)
988 return ret;
989 }
990
991 return 0;
992 }
993
994 /**
995 * power_actor_get_max_power() - get the maximum power that a cdev can consume
996 * @cdev: pointer to &thermal_cooling_device
997 * @tz: a valid thermal zone device pointer
998 * @max_power: pointer in which to store the maximum power
999 *
1000 * Calculate the maximum power consumption in milliwats that the
1001 * cooling device can currently consume and store it in @max_power.
1002 *
1003 * Return: 0 on success, -EINVAL if @cdev doesn't support the
1004 * power_actor API or -E* on other error.
1005 */
1006 int power_actor_get_max_power(struct thermal_cooling_device *cdev,
1007 struct thermal_zone_device *tz, u32 *max_power)
1008 {
1009 if (!cdev_is_power_actor(cdev))
1010 return -EINVAL;
1011
1012 return cdev->ops->state2power(cdev, tz, 0, max_power);
1013 }
1014
1015 /**
1016 * power_actor_get_min_power() - get the mainimum power that a cdev can consume
1017 * @cdev: pointer to &thermal_cooling_device
1018 * @tz: a valid thermal zone device pointer
1019 * @min_power: pointer in which to store the minimum power
1020 *
1021 * Calculate the minimum power consumption in milliwatts that the
1022 * cooling device can currently consume and store it in @min_power.
1023 *
1024 * Return: 0 on success, -EINVAL if @cdev doesn't support the
1025 * power_actor API or -E* on other error.
1026 */
1027 int power_actor_get_min_power(struct thermal_cooling_device *cdev,
1028 struct thermal_zone_device *tz, u32 *min_power)
1029 {
1030 unsigned long max_state;
1031 int ret;
1032
1033 if (!cdev_is_power_actor(cdev))
1034 return -EINVAL;
1035
1036 ret = cdev->ops->get_max_state(cdev, &max_state);
1037 if (ret)
1038 return ret;
1039
1040 return cdev->ops->state2power(cdev, tz, max_state, min_power);
1041 }
1042
1043 /**
1044 * power_actor_set_power() - limit the maximum power that a cooling device can consume
1045 * @cdev: pointer to &thermal_cooling_device
1046 * @instance: thermal instance to update
1047 * @power: the power in milliwatts
1048 *
1049 * Set the cooling device to consume at most @power milliwatts.
1050 *
1051 * Return: 0 on success, -EINVAL if the cooling device does not
1052 * implement the power actor API or -E* for other failures.
1053 */
1054 int power_actor_set_power(struct thermal_cooling_device *cdev,
1055 struct thermal_instance *instance, u32 power)
1056 {
1057 unsigned long state;
1058 int ret;
1059
1060 if (!cdev_is_power_actor(cdev))
1061 return -EINVAL;
1062
1063 ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
1064 if (ret)
1065 return ret;
1066
1067 instance->target = state;
1068 cdev->updated = false;
1069 thermal_cdev_update(cdev);
1070
1071 return 0;
1072 }
1073
1074 static DEVICE_ATTR(type, 0444, type_show, NULL);
1075 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
1076 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
1077 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
1078 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
1079 static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
1080
1081 /* sys I/F for cooling device */
1082 #define to_cooling_device(_dev) \
1083 container_of(_dev, struct thermal_cooling_device, device)
1084
1085 static ssize_t
1086 thermal_cooling_device_type_show(struct device *dev,
1087 struct device_attribute *attr, char *buf)
1088 {
1089 struct thermal_cooling_device *cdev = to_cooling_device(dev);
1090
1091 return sprintf(buf, "%s\n", cdev->type);
1092 }
1093
1094 static ssize_t
1095 thermal_cooling_device_max_state_show(struct device *dev,
1096 struct device_attribute *attr, char *buf)
1097 {
1098 struct thermal_cooling_device *cdev = to_cooling_device(dev);
1099 unsigned long state;
1100 int ret;
1101
1102 ret = cdev->ops->get_max_state(cdev, &state);
1103 if (ret)
1104 return ret;
1105 return sprintf(buf, "%ld\n", state);
1106 }
1107
1108 static ssize_t
1109 thermal_cooling_device_cur_state_show(struct device *dev,
1110 struct device_attribute *attr, char *buf)
1111 {
1112 struct thermal_cooling_device *cdev = to_cooling_device(dev);
1113 unsigned long state;
1114 int ret;
1115
1116 ret = cdev->ops->get_cur_state(cdev, &state);
1117 if (ret)
1118 return ret;
1119 return sprintf(buf, "%ld\n", state);
1120 }
1121
1122 static ssize_t
1123 thermal_cooling_device_cur_state_store(struct device *dev,
1124 struct device_attribute *attr,
1125 const char *buf, size_t count)
1126 {
1127 struct thermal_cooling_device *cdev = to_cooling_device(dev);
1128 unsigned long state;
1129 int result;
1130
1131 if (!sscanf(buf, "%ld\n", &state))
1132 return -EINVAL;
1133
1134 if ((long)state < 0)
1135 return -EINVAL;
1136
1137 result = cdev->ops->set_cur_state(cdev, state);
1138 if (result)
1139 return result;
1140 return count;
1141 }
1142
1143 static struct device_attribute dev_attr_cdev_type =
1144 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
1145 static DEVICE_ATTR(max_state, 0444,
1146 thermal_cooling_device_max_state_show, NULL);
1147 static DEVICE_ATTR(cur_state, 0644,
1148 thermal_cooling_device_cur_state_show,
1149 thermal_cooling_device_cur_state_store);
1150
1151 static ssize_t
1152 thermal_cooling_device_trip_point_show(struct device *dev,
1153 struct device_attribute *attr, char *buf)
1154 {
1155 struct thermal_instance *instance;
1156
1157 instance =
1158 container_of(attr, struct thermal_instance, attr);
1159
1160 if (instance->trip == THERMAL_TRIPS_NONE)
1161 return sprintf(buf, "-1\n");
1162 else
1163 return sprintf(buf, "%d\n", instance->trip);
1164 }
1165
1166 static struct attribute *cooling_device_attrs[] = {
1167 &dev_attr_cdev_type.attr,
1168 &dev_attr_max_state.attr,
1169 &dev_attr_cur_state.attr,
1170 NULL,
1171 };
1172
1173 static const struct attribute_group cooling_device_attr_group = {
1174 .attrs = cooling_device_attrs,
1175 };
1176
1177 static const struct attribute_group *cooling_device_attr_groups[] = {
1178 &cooling_device_attr_group,
1179 NULL,
1180 };
1181
1182 static ssize_t
1183 thermal_cooling_device_weight_show(struct device *dev,
1184 struct device_attribute *attr, char *buf)
1185 {
1186 struct thermal_instance *instance;
1187
1188 instance = container_of(attr, struct thermal_instance, weight_attr);
1189
1190 return sprintf(buf, "%d\n", instance->weight);
1191 }
1192
1193 static ssize_t
1194 thermal_cooling_device_weight_store(struct device *dev,
1195 struct device_attribute *attr,
1196 const char *buf, size_t count)
1197 {
1198 struct thermal_instance *instance;
1199 int ret, weight;
1200
1201 ret = kstrtoint(buf, 0, &weight);
1202 if (ret)
1203 return ret;
1204
1205 instance = container_of(attr, struct thermal_instance, weight_attr);
1206 instance->weight = weight;
1207
1208 return count;
1209 }
1210 /* Device management */
1211
1212 /**
1213 * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
1214 * @tz: pointer to struct thermal_zone_device
1215 * @trip: indicates which trip point the cooling devices is
1216 * associated with in this thermal zone.
1217 * @cdev: pointer to struct thermal_cooling_device
1218 * @upper: the Maximum cooling state for this trip point.
1219 * THERMAL_NO_LIMIT means no upper limit,
1220 * and the cooling device can be in max_state.
1221 * @lower: the Minimum cooling state can be used for this trip point.
1222 * THERMAL_NO_LIMIT means no lower limit,
1223 * and the cooling device can be in cooling state 0.
1224 * @weight: The weight of the cooling device to be bound to the
1225 * thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
1226 * default value
1227 *
1228 * This interface function bind a thermal cooling device to the certain trip
1229 * point of a thermal zone device.
1230 * This function is usually called in the thermal zone device .bind callback.
1231 *
1232 * Return: 0 on success, the proper error value otherwise.
1233 */
1234 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1235 int trip,
1236 struct thermal_cooling_device *cdev,
1237 unsigned long upper, unsigned long lower,
1238 unsigned int weight)
1239 {
1240 struct thermal_instance *dev;
1241 struct thermal_instance *pos;
1242 struct thermal_zone_device *pos1;
1243 struct thermal_cooling_device *pos2;
1244 unsigned long max_state;
1245 int result, ret;
1246
1247 if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1248 return -EINVAL;
1249
1250 list_for_each_entry(pos1, &thermal_tz_list, node) {
1251 if (pos1 == tz)
1252 break;
1253 }
1254 list_for_each_entry(pos2, &thermal_cdev_list, node) {
1255 if (pos2 == cdev)
1256 break;
1257 }
1258
1259 if (tz != pos1 || cdev != pos2)
1260 return -EINVAL;
1261
1262 ret = cdev->ops->get_max_state(cdev, &max_state);
1263 if (ret)
1264 return ret;
1265
1266 /* lower default 0, upper default max_state */
1267 lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1268 upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1269
1270 if (lower > upper || upper > max_state)
1271 return -EINVAL;
1272
1273 dev =
1274 kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1275 if (!dev)
1276 return -ENOMEM;
1277 dev->tz = tz;
1278 dev->cdev = cdev;
1279 dev->trip = trip;
1280 dev->upper = upper;
1281 dev->lower = lower;
1282 dev->target = THERMAL_NO_TARGET;
1283 dev->weight = weight;
1284
1285 result = get_idr(&tz->idr, &tz->lock, &dev->id);
1286 if (result)
1287 goto free_mem;
1288
1289 sprintf(dev->name, "cdev%d", dev->id);
1290 result =
1291 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1292 if (result)
1293 goto release_idr;
1294
1295 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1296 sysfs_attr_init(&dev->attr.attr);
1297 dev->attr.attr.name = dev->attr_name;
1298 dev->attr.attr.mode = 0444;
1299 dev->attr.show = thermal_cooling_device_trip_point_show;
1300 result = device_create_file(&tz->device, &dev->attr);
1301 if (result)
1302 goto remove_symbol_link;
1303
1304 sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
1305 sysfs_attr_init(&dev->weight_attr.attr);
1306 dev->weight_attr.attr.name = dev->weight_attr_name;
1307 dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
1308 dev->weight_attr.show = thermal_cooling_device_weight_show;
1309 dev->weight_attr.store = thermal_cooling_device_weight_store;
1310 result = device_create_file(&tz->device, &dev->weight_attr);
1311 if (result)
1312 goto remove_trip_file;
1313
1314 mutex_lock(&tz->lock);
1315 mutex_lock(&cdev->lock);
1316 list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1317 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1318 result = -EEXIST;
1319 break;
1320 }
1321 if (!result) {
1322 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1323 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1324 }
1325 mutex_unlock(&cdev->lock);
1326 mutex_unlock(&tz->lock);
1327
1328 if (!result)
1329 return 0;
1330
1331 device_remove_file(&tz->device, &dev->weight_attr);
1332 remove_trip_file:
1333 device_remove_file(&tz->device, &dev->attr);
1334 remove_symbol_link:
1335 sysfs_remove_link(&tz->device.kobj, dev->name);
1336 release_idr:
1337 release_idr(&tz->idr, &tz->lock, dev->id);
1338 free_mem:
1339 kfree(dev);
1340 return result;
1341 }
1342 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1343
1344 /**
1345 * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1346 * thermal zone.
1347 * @tz: pointer to a struct thermal_zone_device.
1348 * @trip: indicates which trip point the cooling devices is
1349 * associated with in this thermal zone.
1350 * @cdev: pointer to a struct thermal_cooling_device.
1351 *
1352 * This interface function unbind a thermal cooling device from the certain
1353 * trip point of a thermal zone device.
1354 * This function is usually called in the thermal zone device .unbind callback.
1355 *
1356 * Return: 0 on success, the proper error value otherwise.
1357 */
1358 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1359 int trip,
1360 struct thermal_cooling_device *cdev)
1361 {
1362 struct thermal_instance *pos, *next;
1363
1364 mutex_lock(&tz->lock);
1365 mutex_lock(&cdev->lock);
1366 list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1367 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1368 list_del(&pos->tz_node);
1369 list_del(&pos->cdev_node);
1370 mutex_unlock(&cdev->lock);
1371 mutex_unlock(&tz->lock);
1372 goto unbind;
1373 }
1374 }
1375 mutex_unlock(&cdev->lock);
1376 mutex_unlock(&tz->lock);
1377
1378 return -ENODEV;
1379
1380 unbind:
1381 device_remove_file(&tz->device, &pos->weight_attr);
1382 device_remove_file(&tz->device, &pos->attr);
1383 sysfs_remove_link(&tz->device.kobj, pos->name);
1384 release_idr(&tz->idr, &tz->lock, pos->id);
1385 kfree(pos);
1386 return 0;
1387 }
1388 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1389
1390 static void thermal_release(struct device *dev)
1391 {
1392 struct thermal_zone_device *tz;
1393 struct thermal_cooling_device *cdev;
1394
1395 if (!strncmp(dev_name(dev), "thermal_zone",
1396 sizeof("thermal_zone") - 1)) {
1397 tz = to_thermal_zone(dev);
1398 kfree(tz);
1399 } else if(!strncmp(dev_name(dev), "cooling_device",
1400 sizeof("cooling_device") - 1)){
1401 cdev = to_cooling_device(dev);
1402 kfree(cdev);
1403 }
1404 }
1405
1406 static struct class thermal_class = {
1407 .name = "thermal",
1408 .dev_release = thermal_release,
1409 };
1410
1411 /**
1412 * __thermal_cooling_device_register() - register a new thermal cooling device
1413 * @np: a pointer to a device tree node.
1414 * @type: the thermal cooling device type.
1415 * @devdata: device private data.
1416 * @ops: standard thermal cooling devices callbacks.
1417 *
1418 * This interface function adds a new thermal cooling device (fan/processor/...)
1419 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1420 * to all the thermal zone devices registered at the same time.
1421 * It also gives the opportunity to link the cooling device to a device tree
1422 * node, so that it can be bound to a thermal zone created out of device tree.
1423 *
1424 * Return: a pointer to the created struct thermal_cooling_device or an
1425 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1426 */
1427 static struct thermal_cooling_device *
1428 __thermal_cooling_device_register(struct device_node *np,
1429 char *type, void *devdata,
1430 const struct thermal_cooling_device_ops *ops)
1431 {
1432 struct thermal_cooling_device *cdev;
1433 int result;
1434
1435 if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1436 return ERR_PTR(-EINVAL);
1437
1438 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1439 !ops->set_cur_state)
1440 return ERR_PTR(-EINVAL);
1441
1442 cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1443 if (!cdev)
1444 return ERR_PTR(-ENOMEM);
1445
1446 result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1447 if (result) {
1448 kfree(cdev);
1449 return ERR_PTR(result);
1450 }
1451
1452 strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1453 mutex_init(&cdev->lock);
1454 INIT_LIST_HEAD(&cdev->thermal_instances);
1455 cdev->np = np;
1456 cdev->ops = ops;
1457 cdev->updated = false;
1458 cdev->device.class = &thermal_class;
1459 cdev->device.groups = cooling_device_attr_groups;
1460 cdev->devdata = devdata;
1461 dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1462 result = device_register(&cdev->device);
1463 if (result) {
1464 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1465 kfree(cdev);
1466 return ERR_PTR(result);
1467 }
1468
1469 /* Add 'this' new cdev to the global cdev list */
1470 mutex_lock(&thermal_list_lock);
1471 list_add(&cdev->node, &thermal_cdev_list);
1472 mutex_unlock(&thermal_list_lock);
1473
1474 /* Update binding information for 'this' new cdev */
1475 bind_cdev(cdev);
1476
1477 return cdev;
1478 }
1479
1480 /**
1481 * thermal_cooling_device_register() - register a new thermal cooling device
1482 * @type: the thermal cooling device type.
1483 * @devdata: device private data.
1484 * @ops: standard thermal cooling devices callbacks.
1485 *
1486 * This interface function adds a new thermal cooling device (fan/processor/...)
1487 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1488 * to all the thermal zone devices registered at the same time.
1489 *
1490 * Return: a pointer to the created struct thermal_cooling_device or an
1491 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1492 */
1493 struct thermal_cooling_device *
1494 thermal_cooling_device_register(char *type, void *devdata,
1495 const struct thermal_cooling_device_ops *ops)
1496 {
1497 return __thermal_cooling_device_register(NULL, type, devdata, ops);
1498 }
1499 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1500
1501 /**
1502 * thermal_of_cooling_device_register() - register an OF thermal cooling device
1503 * @np: a pointer to a device tree node.
1504 * @type: the thermal cooling device type.
1505 * @devdata: device private data.
1506 * @ops: standard thermal cooling devices callbacks.
1507 *
1508 * This function will register a cooling device with device tree node reference.
1509 * This interface function adds a new thermal cooling device (fan/processor/...)
1510 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1511 * to all the thermal zone devices registered at the same time.
1512 *
1513 * Return: a pointer to the created struct thermal_cooling_device or an
1514 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1515 */
1516 struct thermal_cooling_device *
1517 thermal_of_cooling_device_register(struct device_node *np,
1518 char *type, void *devdata,
1519 const struct thermal_cooling_device_ops *ops)
1520 {
1521 return __thermal_cooling_device_register(np, type, devdata, ops);
1522 }
1523 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1524
1525 /**
1526 * thermal_cooling_device_unregister - removes the registered thermal cooling device
1527 * @cdev: the thermal cooling device to remove.
1528 *
1529 * thermal_cooling_device_unregister() must be called when the device is no
1530 * longer needed.
1531 */
1532 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1533 {
1534 int i;
1535 const struct thermal_zone_params *tzp;
1536 struct thermal_zone_device *tz;
1537 struct thermal_cooling_device *pos = NULL;
1538
1539 if (!cdev)
1540 return;
1541
1542 mutex_lock(&thermal_list_lock);
1543 list_for_each_entry(pos, &thermal_cdev_list, node)
1544 if (pos == cdev)
1545 break;
1546 if (pos != cdev) {
1547 /* thermal cooling device not found */
1548 mutex_unlock(&thermal_list_lock);
1549 return;
1550 }
1551 list_del(&cdev->node);
1552
1553 /* Unbind all thermal zones associated with 'this' cdev */
1554 list_for_each_entry(tz, &thermal_tz_list, node) {
1555 if (tz->ops->unbind) {
1556 tz->ops->unbind(tz, cdev);
1557 continue;
1558 }
1559
1560 if (!tz->tzp || !tz->tzp->tbp)
1561 continue;
1562
1563 tzp = tz->tzp;
1564 for (i = 0; i < tzp->num_tbps; i++) {
1565 if (tzp->tbp[i].cdev == cdev) {
1566 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1567 tzp->tbp[i].cdev = NULL;
1568 }
1569 }
1570 }
1571
1572 mutex_unlock(&thermal_list_lock);
1573
1574 if (cdev->type[0])
1575 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1576 device_remove_file(&cdev->device, &dev_attr_max_state);
1577 device_remove_file(&cdev->device, &dev_attr_cur_state);
1578
1579 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1580 device_unregister(&cdev->device);
1581 return;
1582 }
1583 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1584
1585 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1586 {
1587 struct thermal_instance *instance;
1588 unsigned long target = 0;
1589
1590 /* cooling device is updated*/
1591 if (cdev->updated)
1592 return;
1593
1594 mutex_lock(&cdev->lock);
1595 /* Make sure cdev enters the deepest cooling state */
1596 list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1597 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1598 instance->tz->id, instance->target);
1599 if (instance->target == THERMAL_NO_TARGET)
1600 continue;
1601 if (instance->target > target)
1602 target = instance->target;
1603 }
1604 mutex_unlock(&cdev->lock);
1605 cdev->ops->set_cur_state(cdev, target);
1606 cdev->updated = true;
1607 trace_cdev_update(cdev, target);
1608 dev_dbg(&cdev->device, "set to state %lu\n", target);
1609 }
1610 EXPORT_SYMBOL(thermal_cdev_update);
1611
1612 /**
1613 * thermal_notify_framework - Sensor drivers use this API to notify framework
1614 * @tz: thermal zone device
1615 * @trip: indicates which trip point has been crossed
1616 *
1617 * This function handles the trip events from sensor drivers. It starts
1618 * throttling the cooling devices according to the policy configured.
1619 * For CRITICAL and HOT trip points, this notifies the respective drivers,
1620 * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1621 * The throttling policy is based on the configured platform data; if no
1622 * platform data is provided, this uses the step_wise throttling policy.
1623 */
1624 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1625 {
1626 handle_thermal_trip(tz, trip);
1627 }
1628 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1629
1630 /**
1631 * create_trip_attrs() - create attributes for trip points
1632 * @tz: the thermal zone device
1633 * @mask: Writeable trip point bitmap.
1634 *
1635 * helper function to instantiate sysfs entries for every trip
1636 * point and its properties of a struct thermal_zone_device.
1637 *
1638 * Return: 0 on success, the proper error value otherwise.
1639 */
1640 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1641 {
1642 int indx;
1643 int size = sizeof(struct thermal_attr) * tz->trips;
1644
1645 tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1646 if (!tz->trip_type_attrs)
1647 return -ENOMEM;
1648
1649 tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1650 if (!tz->trip_temp_attrs) {
1651 kfree(tz->trip_type_attrs);
1652 return -ENOMEM;
1653 }
1654
1655 if (tz->ops->get_trip_hyst) {
1656 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1657 if (!tz->trip_hyst_attrs) {
1658 kfree(tz->trip_type_attrs);
1659 kfree(tz->trip_temp_attrs);
1660 return -ENOMEM;
1661 }
1662 }
1663
1664
1665 for (indx = 0; indx < tz->trips; indx++) {
1666 /* create trip type attribute */
1667 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1668 "trip_point_%d_type", indx);
1669
1670 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1671 tz->trip_type_attrs[indx].attr.attr.name =
1672 tz->trip_type_attrs[indx].name;
1673 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1674 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1675
1676 device_create_file(&tz->device,
1677 &tz->trip_type_attrs[indx].attr);
1678
1679 /* create trip temp attribute */
1680 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1681 "trip_point_%d_temp", indx);
1682
1683 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1684 tz->trip_temp_attrs[indx].attr.attr.name =
1685 tz->trip_temp_attrs[indx].name;
1686 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1687 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1688 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
1689 mask & (1 << indx)) {
1690 tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1691 tz->trip_temp_attrs[indx].attr.store =
1692 trip_point_temp_store;
1693 }
1694
1695 device_create_file(&tz->device,
1696 &tz->trip_temp_attrs[indx].attr);
1697
1698 /* create Optional trip hyst attribute */
1699 if (!tz->ops->get_trip_hyst)
1700 continue;
1701 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1702 "trip_point_%d_hyst", indx);
1703
1704 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1705 tz->trip_hyst_attrs[indx].attr.attr.name =
1706 tz->trip_hyst_attrs[indx].name;
1707 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1708 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1709 if (tz->ops->set_trip_hyst) {
1710 tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1711 tz->trip_hyst_attrs[indx].attr.store =
1712 trip_point_hyst_store;
1713 }
1714
1715 device_create_file(&tz->device,
1716 &tz->trip_hyst_attrs[indx].attr);
1717 }
1718 return 0;
1719 }
1720
1721 static void remove_trip_attrs(struct thermal_zone_device *tz)
1722 {
1723 int indx;
1724
1725 for (indx = 0; indx < tz->trips; indx++) {
1726 device_remove_file(&tz->device,
1727 &tz->trip_type_attrs[indx].attr);
1728 device_remove_file(&tz->device,
1729 &tz->trip_temp_attrs[indx].attr);
1730 if (tz->ops->get_trip_hyst)
1731 device_remove_file(&tz->device,
1732 &tz->trip_hyst_attrs[indx].attr);
1733 }
1734 kfree(tz->trip_type_attrs);
1735 kfree(tz->trip_temp_attrs);
1736 kfree(tz->trip_hyst_attrs);
1737 }
1738
1739 /**
1740 * thermal_zone_device_register() - register a new thermal zone device
1741 * @type: the thermal zone device type
1742 * @trips: the number of trip points the thermal zone support
1743 * @mask: a bit string indicating the writeablility of trip points
1744 * @devdata: private device data
1745 * @ops: standard thermal zone device callbacks
1746 * @tzp: thermal zone platform parameters
1747 * @passive_delay: number of milliseconds to wait between polls when
1748 * performing passive cooling
1749 * @polling_delay: number of milliseconds to wait between polls when checking
1750 * whether trip points have been crossed (0 for interrupt
1751 * driven systems)
1752 *
1753 * This interface function adds a new thermal zone device (sensor) to
1754 * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1755 * thermal cooling devices registered at the same time.
1756 * thermal_zone_device_unregister() must be called when the device is no
1757 * longer needed. The passive cooling depends on the .get_trend() return value.
1758 *
1759 * Return: a pointer to the created struct thermal_zone_device or an
1760 * in case of error, an ERR_PTR. Caller must check return value with
1761 * IS_ERR*() helpers.
1762 */
1763 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1764 int trips, int mask, void *devdata,
1765 struct thermal_zone_device_ops *ops,
1766 struct thermal_zone_params *tzp,
1767 int passive_delay, int polling_delay)
1768 {
1769 struct thermal_zone_device *tz;
1770 enum thermal_trip_type trip_type;
1771 int result;
1772 int count;
1773 int passive = 0;
1774 struct thermal_governor *governor;
1775
1776 if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1777 return ERR_PTR(-EINVAL);
1778
1779 if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1780 return ERR_PTR(-EINVAL);
1781
1782 if (!ops)
1783 return ERR_PTR(-EINVAL);
1784
1785 if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1786 return ERR_PTR(-EINVAL);
1787
1788 tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1789 if (!tz)
1790 return ERR_PTR(-ENOMEM);
1791
1792 INIT_LIST_HEAD(&tz->thermal_instances);
1793 idr_init(&tz->idr);
1794 mutex_init(&tz->lock);
1795 result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1796 if (result) {
1797 kfree(tz);
1798 return ERR_PTR(result);
1799 }
1800
1801 strlcpy(tz->type, type ? : "", sizeof(tz->type));
1802 tz->ops = ops;
1803 tz->tzp = tzp;
1804 tz->device.class = &thermal_class;
1805 tz->devdata = devdata;
1806 tz->trips = trips;
1807 tz->passive_delay = passive_delay;
1808 tz->polling_delay = polling_delay;
1809
1810 dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1811 result = device_register(&tz->device);
1812 if (result) {
1813 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1814 kfree(tz);
1815 return ERR_PTR(result);
1816 }
1817
1818 /* sys I/F */
1819 if (type) {
1820 result = device_create_file(&tz->device, &dev_attr_type);
1821 if (result)
1822 goto unregister;
1823 }
1824
1825 result = device_create_file(&tz->device, &dev_attr_temp);
1826 if (result)
1827 goto unregister;
1828
1829 if (ops->get_mode) {
1830 result = device_create_file(&tz->device, &dev_attr_mode);
1831 if (result)
1832 goto unregister;
1833 }
1834
1835 result = create_trip_attrs(tz, mask);
1836 if (result)
1837 goto unregister;
1838
1839 for (count = 0; count < trips; count++) {
1840 tz->ops->get_trip_type(tz, count, &trip_type);
1841 if (trip_type == THERMAL_TRIP_PASSIVE)
1842 passive = 1;
1843 }
1844
1845 if (!passive) {
1846 result = device_create_file(&tz->device, &dev_attr_passive);
1847 if (result)
1848 goto unregister;
1849 }
1850
1851 if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) {
1852 result = device_create_file(&tz->device, &dev_attr_emul_temp);
1853 if (result)
1854 goto unregister;
1855 }
1856
1857 /* Create policy attribute */
1858 result = device_create_file(&tz->device, &dev_attr_policy);
1859 if (result)
1860 goto unregister;
1861
1862 /* Add thermal zone params */
1863 result = create_tzp_attrs(&tz->device);
1864 if (result)
1865 goto unregister;
1866
1867 /* Create available_policies attribute */
1868 result = device_create_file(&tz->device, &dev_attr_available_policies);
1869 if (result)
1870 goto unregister;
1871
1872 /* Update 'this' zone's governor information */
1873 mutex_lock(&thermal_governor_lock);
1874
1875 if (tz->tzp)
1876 governor = __find_governor(tz->tzp->governor_name);
1877 else
1878 governor = def_governor;
1879
1880 result = thermal_set_governor(tz, governor);
1881 if (result) {
1882 mutex_unlock(&thermal_governor_lock);
1883 goto unregister;
1884 }
1885
1886 mutex_unlock(&thermal_governor_lock);
1887
1888 if (!tz->tzp || !tz->tzp->no_hwmon) {
1889 result = thermal_add_hwmon_sysfs(tz);
1890 if (result)
1891 goto unregister;
1892 }
1893
1894 mutex_lock(&thermal_list_lock);
1895 list_add_tail(&tz->node, &thermal_tz_list);
1896 mutex_unlock(&thermal_list_lock);
1897
1898 /* Bind cooling devices for this zone */
1899 bind_tz(tz);
1900
1901 INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1902
1903 thermal_zone_device_update(tz);
1904
1905 return tz;
1906
1907 unregister:
1908 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1909 device_unregister(&tz->device);
1910 return ERR_PTR(result);
1911 }
1912 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1913
1914 /**
1915 * thermal_device_unregister - removes the registered thermal zone device
1916 * @tz: the thermal zone device to remove
1917 */
1918 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1919 {
1920 int i;
1921 const struct thermal_zone_params *tzp;
1922 struct thermal_cooling_device *cdev;
1923 struct thermal_zone_device *pos = NULL;
1924
1925 if (!tz)
1926 return;
1927
1928 tzp = tz->tzp;
1929
1930 mutex_lock(&thermal_list_lock);
1931 list_for_each_entry(pos, &thermal_tz_list, node)
1932 if (pos == tz)
1933 break;
1934 if (pos != tz) {
1935 /* thermal zone device not found */
1936 mutex_unlock(&thermal_list_lock);
1937 return;
1938 }
1939 list_del(&tz->node);
1940
1941 /* Unbind all cdevs associated with 'this' thermal zone */
1942 list_for_each_entry(cdev, &thermal_cdev_list, node) {
1943 if (tz->ops->unbind) {
1944 tz->ops->unbind(tz, cdev);
1945 continue;
1946 }
1947
1948 if (!tzp || !tzp->tbp)
1949 break;
1950
1951 for (i = 0; i < tzp->num_tbps; i++) {
1952 if (tzp->tbp[i].cdev == cdev) {
1953 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1954 tzp->tbp[i].cdev = NULL;
1955 }
1956 }
1957 }
1958
1959 mutex_unlock(&thermal_list_lock);
1960
1961 thermal_zone_device_set_polling(tz, 0);
1962
1963 if (tz->type[0])
1964 device_remove_file(&tz->device, &dev_attr_type);
1965 device_remove_file(&tz->device, &dev_attr_temp);
1966 if (tz->ops->get_mode)
1967 device_remove_file(&tz->device, &dev_attr_mode);
1968 device_remove_file(&tz->device, &dev_attr_policy);
1969 device_remove_file(&tz->device, &dev_attr_available_policies);
1970 remove_trip_attrs(tz);
1971 thermal_set_governor(tz, NULL);
1972
1973 thermal_remove_hwmon_sysfs(tz);
1974 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1975 idr_destroy(&tz->idr);
1976 mutex_destroy(&tz->lock);
1977 device_unregister(&tz->device);
1978 return;
1979 }
1980 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
1981
1982 /**
1983 * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1984 * @name: thermal zone name to fetch the temperature
1985 *
1986 * When only one zone is found with the passed name, returns a reference to it.
1987 *
1988 * Return: On success returns a reference to an unique thermal zone with
1989 * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1990 * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1991 */
1992 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1993 {
1994 struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1995 unsigned int found = 0;
1996
1997 if (!name)
1998 goto exit;
1999
2000 mutex_lock(&thermal_list_lock);
2001 list_for_each_entry(pos, &thermal_tz_list, node)
2002 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
2003 found++;
2004 ref = pos;
2005 }
2006 mutex_unlock(&thermal_list_lock);
2007
2008 /* nothing has been found, thus an error code for it */
2009 if (found == 0)
2010 ref = ERR_PTR(-ENODEV);
2011 else if (found > 1)
2012 /* Success only when an unique zone is found */
2013 ref = ERR_PTR(-EEXIST);
2014
2015 exit:
2016 return ref;
2017 }
2018 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
2019
2020 #ifdef CONFIG_NET
2021 static const struct genl_multicast_group thermal_event_mcgrps[] = {
2022 { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
2023 };
2024
2025 static struct genl_family thermal_event_genl_family = {
2026 .id = GENL_ID_GENERATE,
2027 .name = THERMAL_GENL_FAMILY_NAME,
2028 .version = THERMAL_GENL_VERSION,
2029 .maxattr = THERMAL_GENL_ATTR_MAX,
2030 .mcgrps = thermal_event_mcgrps,
2031 .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
2032 };
2033
2034 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
2035 enum events event)
2036 {
2037 struct sk_buff *skb;
2038 struct nlattr *attr;
2039 struct thermal_genl_event *thermal_event;
2040 void *msg_header;
2041 int size;
2042 int result;
2043 static unsigned int thermal_event_seqnum;
2044
2045 if (!tz)
2046 return -EINVAL;
2047
2048 /* allocate memory */
2049 size = nla_total_size(sizeof(struct thermal_genl_event)) +
2050 nla_total_size(0);
2051
2052 skb = genlmsg_new(size, GFP_ATOMIC);
2053 if (!skb)
2054 return -ENOMEM;
2055
2056 /* add the genetlink message header */
2057 msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
2058 &thermal_event_genl_family, 0,
2059 THERMAL_GENL_CMD_EVENT);
2060 if (!msg_header) {
2061 nlmsg_free(skb);
2062 return -ENOMEM;
2063 }
2064
2065 /* fill the data */
2066 attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
2067 sizeof(struct thermal_genl_event));
2068
2069 if (!attr) {
2070 nlmsg_free(skb);
2071 return -EINVAL;
2072 }
2073
2074 thermal_event = nla_data(attr);
2075 if (!thermal_event) {
2076 nlmsg_free(skb);
2077 return -EINVAL;
2078 }
2079
2080 memset(thermal_event, 0, sizeof(struct thermal_genl_event));
2081
2082 thermal_event->orig = tz->id;
2083 thermal_event->event = event;
2084
2085 /* send multicast genetlink message */
2086 genlmsg_end(skb, msg_header);
2087
2088 result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
2089 0, GFP_ATOMIC);
2090 if (result)
2091 dev_err(&tz->device, "Failed to send netlink event:%d", result);
2092
2093 return result;
2094 }
2095 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
2096
2097 static int genetlink_init(void)
2098 {
2099 return genl_register_family(&thermal_event_genl_family);
2100 }
2101
2102 static void genetlink_exit(void)
2103 {
2104 genl_unregister_family(&thermal_event_genl_family);
2105 }
2106 #else /* !CONFIG_NET */
2107 static inline int genetlink_init(void) { return 0; }
2108 static inline void genetlink_exit(void) {}
2109 #endif /* !CONFIG_NET */
2110
2111 static int __init thermal_register_governors(void)
2112 {
2113 int result;
2114
2115 result = thermal_gov_step_wise_register();
2116 if (result)
2117 return result;
2118
2119 result = thermal_gov_fair_share_register();
2120 if (result)
2121 return result;
2122
2123 result = thermal_gov_bang_bang_register();
2124 if (result)
2125 return result;
2126
2127 result = thermal_gov_user_space_register();
2128 if (result)
2129 return result;
2130
2131 return thermal_gov_power_allocator_register();
2132 }
2133
2134 static void thermal_unregister_governors(void)
2135 {
2136 thermal_gov_step_wise_unregister();
2137 thermal_gov_fair_share_unregister();
2138 thermal_gov_bang_bang_unregister();
2139 thermal_gov_user_space_unregister();
2140 thermal_gov_power_allocator_unregister();
2141 }
2142
2143 static int __init thermal_init(void)
2144 {
2145 int result;
2146
2147 result = thermal_register_governors();
2148 if (result)
2149 goto error;
2150
2151 result = class_register(&thermal_class);
2152 if (result)
2153 goto unregister_governors;
2154
2155 result = genetlink_init();
2156 if (result)
2157 goto unregister_class;
2158
2159 result = of_parse_thermal_zones();
2160 if (result)
2161 goto exit_netlink;
2162
2163 return 0;
2164
2165 exit_netlink:
2166 genetlink_exit();
2167 unregister_class:
2168 class_unregister(&thermal_class);
2169 unregister_governors:
2170 thermal_unregister_governors();
2171 error:
2172 idr_destroy(&thermal_tz_idr);
2173 idr_destroy(&thermal_cdev_idr);
2174 mutex_destroy(&thermal_idr_lock);
2175 mutex_destroy(&thermal_list_lock);
2176 mutex_destroy(&thermal_governor_lock);
2177 return result;
2178 }
2179
2180 static void __exit thermal_exit(void)
2181 {
2182 of_thermal_destroy_zones();
2183 genetlink_exit();
2184 class_unregister(&thermal_class);
2185 thermal_unregister_governors();
2186 idr_destroy(&thermal_tz_idr);
2187 idr_destroy(&thermal_cdev_idr);
2188 mutex_destroy(&thermal_idr_lock);
2189 mutex_destroy(&thermal_list_lock);
2190 mutex_destroy(&thermal_governor_lock);
2191 }
2192
2193 fs_initcall(thermal_init);
2194 module_exit(thermal_exit);
Linux with added FPC-III support