2 * thermal.c - Generic Thermal Management Sysfs support.
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>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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.
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
38 #include <net/netlink.h>
39 #include <net/genetlink.h>
40 #define CREATE_TRACE_POINTS
41 #include <trace/events/thermal.h>
43 #include "thermal_core.h"
44 #include "thermal_hwmon.h"
46 MODULE_AUTHOR("Zhang Rui");
47 MODULE_DESCRIPTION("Generic thermal management sysfs support");
48 MODULE_LICENSE("GPL v2");
50 static DEFINE_IDR(thermal_tz_idr);
51 static DEFINE_IDR(thermal_cdev_idr);
52 static DEFINE_MUTEX(thermal_idr_lock);
54 static LIST_HEAD(thermal_tz_list);
55 static LIST_HEAD(thermal_cdev_list);
56 static LIST_HEAD(thermal_governor_list);
58 static DEFINE_MUTEX(thermal_list_lock);
59 static DEFINE_MUTEX(thermal_governor_lock);
61 static struct thermal_governor *__find_governor(const char *name)
63 struct thermal_governor *pos;
65 list_for_each_entry(pos, &thermal_governor_list, governor_list)
66 if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH))
72 int thermal_register_governor(struct thermal_governor *governor)
76 struct thermal_zone_device *pos;
81 mutex_lock(&thermal_governor_lock);
84 if (__find_governor(governor->name) == NULL) {
86 list_add(&governor->governor_list, &thermal_governor_list);
89 mutex_lock(&thermal_list_lock);
91 list_for_each_entry(pos, &thermal_tz_list, node) {
95 name = pos->tzp->governor_name;
97 name = DEFAULT_THERMAL_GOVERNOR;
98 if (!strnicmp(name, governor->name, THERMAL_NAME_LENGTH)) {
99 if (governor->start) {
100 err = governor->start(pos);
104 pos->governor = governor;
109 mutex_unlock(&thermal_list_lock);
110 mutex_unlock(&thermal_governor_lock);
115 void thermal_unregister_governor(struct thermal_governor *governor)
117 struct thermal_zone_device *pos;
122 mutex_lock(&thermal_governor_lock);
124 if (__find_governor(governor->name) == NULL)
127 mutex_lock(&thermal_list_lock);
129 list_for_each_entry(pos, &thermal_tz_list, node) {
130 if (!strnicmp(pos->governor->name, governor->name,
131 THERMAL_NAME_LENGTH)) {
132 if (pos->governor->stop)
133 pos->governor->stop(pos);
134 pos->governor = NULL;
138 mutex_unlock(&thermal_list_lock);
139 list_del(&governor->governor_list);
141 mutex_unlock(&thermal_governor_lock);
145 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
151 ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
154 if (unlikely(ret < 0))
160 static void release_idr(struct idr *idr, struct mutex *lock, int id)
169 int get_tz_trend(struct thermal_zone_device *tz, int trip)
171 enum thermal_trend trend;
173 if (tz->emul_temperature || !tz->ops->get_trend ||
174 tz->ops->get_trend(tz, trip, &trend)) {
175 if (tz->temperature > tz->last_temperature)
176 trend = THERMAL_TREND_RAISING;
177 else if (tz->temperature < tz->last_temperature)
178 trend = THERMAL_TREND_DROPPING;
180 trend = THERMAL_TREND_STABLE;
185 EXPORT_SYMBOL(get_tz_trend);
187 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
188 struct thermal_cooling_device *cdev, int trip)
190 struct thermal_instance *pos = NULL;
191 struct thermal_instance *target_instance = NULL;
193 mutex_lock(&tz->lock);
194 mutex_lock(&cdev->lock);
196 list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
197 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
198 target_instance = pos;
203 mutex_unlock(&cdev->lock);
204 mutex_unlock(&tz->lock);
206 return target_instance;
208 EXPORT_SYMBOL(get_thermal_instance);
210 static void print_bind_err_msg(struct thermal_zone_device *tz,
211 struct thermal_cooling_device *cdev, int ret)
213 dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
214 tz->type, cdev->type, ret);
217 static void __bind(struct thermal_zone_device *tz, u64 mask,
218 struct thermal_cooling_device *cdev,
219 unsigned long *limits)
223 for (i = 0; i < tz->trips; i++) {
224 if (mask & (1ULL << i)) {
225 unsigned long upper, lower;
227 upper = THERMAL_NO_LIMIT;
228 lower = THERMAL_NO_LIMIT;
230 lower = limits[i * 2];
231 upper = limits[i * 2 + 1];
233 ret = thermal_zone_bind_cooling_device(tz, i, cdev,
236 print_bind_err_msg(tz, cdev, ret);
241 static void __unbind(struct thermal_zone_device *tz, u64 mask,
242 struct thermal_cooling_device *cdev)
246 for (i = 0; i < tz->trips; i++)
247 if (mask & (1ULL << i))
248 thermal_zone_unbind_cooling_device(tz, i, cdev);
251 static void bind_cdev(struct thermal_cooling_device *cdev)
254 const struct thermal_zone_params *tzp;
255 struct thermal_zone_device *pos = NULL;
257 mutex_lock(&thermal_list_lock);
259 list_for_each_entry(pos, &thermal_tz_list, node) {
260 if (!pos->tzp && !pos->ops->bind)
263 if (pos->ops->bind) {
264 ret = pos->ops->bind(pos, cdev);
266 print_bind_err_msg(pos, cdev, ret);
271 if (!tzp || !tzp->tbp)
274 for (i = 0; i < tzp->num_tbps; i++) {
275 if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
277 if (tzp->tbp[i].match(pos, cdev))
279 tzp->tbp[i].cdev = cdev;
280 __bind(pos, tzp->tbp[i].trip_mask, cdev,
281 tzp->tbp[i].binding_limits);
285 mutex_unlock(&thermal_list_lock);
288 static void bind_tz(struct thermal_zone_device *tz)
291 struct thermal_cooling_device *pos = NULL;
292 const struct thermal_zone_params *tzp = tz->tzp;
294 if (!tzp && !tz->ops->bind)
297 mutex_lock(&thermal_list_lock);
299 /* If there is ops->bind, try to use ops->bind */
301 list_for_each_entry(pos, &thermal_cdev_list, node) {
302 ret = tz->ops->bind(tz, pos);
304 print_bind_err_msg(tz, pos, ret);
309 if (!tzp || !tzp->tbp)
312 list_for_each_entry(pos, &thermal_cdev_list, node) {
313 for (i = 0; i < tzp->num_tbps; i++) {
314 if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
316 if (tzp->tbp[i].match(tz, pos))
318 tzp->tbp[i].cdev = pos;
319 __bind(tz, tzp->tbp[i].trip_mask, pos,
320 tzp->tbp[i].binding_limits);
324 mutex_unlock(&thermal_list_lock);
327 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
331 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
332 round_jiffies(msecs_to_jiffies(delay)));
334 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
335 msecs_to_jiffies(delay));
337 cancel_delayed_work(&tz->poll_queue);
340 static void monitor_thermal_zone(struct thermal_zone_device *tz)
342 mutex_lock(&tz->lock);
345 thermal_zone_device_set_polling(tz, tz->passive_delay);
346 else if (tz->polling_delay)
347 thermal_zone_device_set_polling(tz, tz->polling_delay);
349 thermal_zone_device_set_polling(tz, 0);
351 mutex_unlock(&tz->lock);
354 static void handle_non_critical_trips(struct thermal_zone_device *tz,
355 int trip, enum thermal_trip_type trip_type)
358 tz->governor->throttle(tz, trip);
361 static void handle_critical_trips(struct thermal_zone_device *tz,
362 int trip, enum thermal_trip_type trip_type)
366 tz->ops->get_trip_temp(tz, trip, &trip_temp);
368 /* If we have not crossed the trip_temp, we do not care. */
369 if (tz->temperature < trip_temp)
373 tz->ops->notify(tz, trip, trip_type);
375 if (trip_type == THERMAL_TRIP_CRITICAL) {
376 dev_emerg(&tz->device,
377 "critical temperature reached(%d C),shutting down\n",
378 tz->temperature / 1000);
379 orderly_poweroff(true);
383 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
385 enum thermal_trip_type type;
387 trace_thermal_trip(tz->type, tz->temperature/1000);
389 tz->ops->get_trip_type(tz, trip, &type);
391 if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
392 handle_critical_trips(tz, trip, type);
394 handle_non_critical_trips(tz, trip, type);
396 * Alright, we handled this trip successfully.
397 * So, start monitoring again.
399 monitor_thermal_zone(tz);
403 * thermal_zone_get_temp() - returns its the temperature of thermal zone
404 * @tz: a valid pointer to a struct thermal_zone_device
405 * @temp: a valid pointer to where to store the resulting temperature.
407 * When a valid thermal zone reference is passed, it will fetch its
408 * temperature and fill @temp.
410 * Return: On success returns 0, an error code otherwise
412 int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
415 #ifdef CONFIG_THERMAL_EMULATION
417 unsigned long crit_temp = -1UL;
418 enum thermal_trip_type type;
421 if (!tz || IS_ERR(tz) || !tz->ops->get_temp ||
422 !device_is_registered(&tz->device))
425 mutex_lock(&tz->lock);
427 ret = tz->ops->get_temp(tz, temp);
428 #ifdef CONFIG_THERMAL_EMULATION
429 if (!tz->emul_temperature)
432 for (count = 0; count < tz->trips; count++) {
433 ret = tz->ops->get_trip_type(tz, count, &type);
434 if (!ret && type == THERMAL_TRIP_CRITICAL) {
435 ret = tz->ops->get_trip_temp(tz, count, &crit_temp);
443 if (*temp < crit_temp)
444 *temp = tz->emul_temperature;
447 mutex_unlock(&tz->lock);
451 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
453 static int update_temperature(struct thermal_zone_device *tz)
458 ret = thermal_zone_get_temp(tz, &temp);
460 dev_warn(&tz->device, "failed to read out thermal zone %d\n",
465 mutex_lock(&tz->lock);
466 tz->last_temperature = tz->temperature;
467 tz->temperature = temp;
468 mutex_unlock(&tz->lock);
473 void thermal_zone_device_update(struct thermal_zone_device *tz)
477 if (!tz || !tz->ops->get_temp || !device_is_registered(&tz->device))
480 if (update_temperature(tz))
483 for (count = 0; count < tz->trips; count++)
484 handle_thermal_trip(tz, count);
486 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
488 static void thermal_zone_device_check(struct work_struct *work)
490 struct thermal_zone_device *tz = container_of(work, struct
493 thermal_zone_device_update(tz);
496 /* sys I/F for thermal zone */
498 #define to_thermal_zone(_dev) \
499 container_of(_dev, struct thermal_zone_device, device)
502 type_show(struct device *dev, struct device_attribute *attr, char *buf)
504 struct thermal_zone_device *tz = to_thermal_zone(dev);
506 return sprintf(buf, "%s\n", tz->type);
510 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
512 struct thermal_zone_device *tz = to_thermal_zone(dev);
516 ret = thermal_zone_get_temp(tz, &temperature);
521 return sprintf(buf, "%ld\n", temperature);
525 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
527 struct thermal_zone_device *tz = to_thermal_zone(dev);
528 enum thermal_device_mode mode;
531 if (!tz->ops->get_mode)
534 result = tz->ops->get_mode(tz, &mode);
538 return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
543 mode_store(struct device *dev, struct device_attribute *attr,
544 const char *buf, size_t count)
546 struct thermal_zone_device *tz = to_thermal_zone(dev);
549 if (!tz->ops->set_mode)
552 if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
553 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
554 else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
555 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
566 trip_point_type_show(struct device *dev, struct device_attribute *attr,
569 struct thermal_zone_device *tz = to_thermal_zone(dev);
570 enum thermal_trip_type type;
573 if (!tz->ops->get_trip_type)
576 if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
579 result = tz->ops->get_trip_type(tz, trip, &type);
584 case THERMAL_TRIP_CRITICAL:
585 return sprintf(buf, "critical\n");
586 case THERMAL_TRIP_HOT:
587 return sprintf(buf, "hot\n");
588 case THERMAL_TRIP_PASSIVE:
589 return sprintf(buf, "passive\n");
590 case THERMAL_TRIP_ACTIVE:
591 return sprintf(buf, "active\n");
593 return sprintf(buf, "unknown\n");
598 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
599 const char *buf, size_t count)
601 struct thermal_zone_device *tz = to_thermal_zone(dev);
603 unsigned long temperature;
605 if (!tz->ops->set_trip_temp)
608 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
611 if (kstrtoul(buf, 10, &temperature))
614 ret = tz->ops->set_trip_temp(tz, trip, temperature);
616 return ret ? ret : count;
620 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
623 struct thermal_zone_device *tz = to_thermal_zone(dev);
627 if (!tz->ops->get_trip_temp)
630 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
633 ret = tz->ops->get_trip_temp(tz, trip, &temperature);
638 return sprintf(buf, "%ld\n", temperature);
642 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
643 const char *buf, size_t count)
645 struct thermal_zone_device *tz = to_thermal_zone(dev);
647 unsigned long temperature;
649 if (!tz->ops->set_trip_hyst)
652 if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
655 if (kstrtoul(buf, 10, &temperature))
659 * We are not doing any check on the 'temperature' value
660 * here. The driver implementing 'set_trip_hyst' has to
663 ret = tz->ops->set_trip_hyst(tz, trip, temperature);
665 return ret ? ret : count;
669 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
672 struct thermal_zone_device *tz = to_thermal_zone(dev);
674 unsigned long temperature;
676 if (!tz->ops->get_trip_hyst)
679 if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
682 ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
684 return ret ? ret : sprintf(buf, "%ld\n", temperature);
688 passive_store(struct device *dev, struct device_attribute *attr,
689 const char *buf, size_t count)
691 struct thermal_zone_device *tz = to_thermal_zone(dev);
692 struct thermal_cooling_device *cdev = NULL;
695 if (!sscanf(buf, "%d\n", &state))
698 /* sanity check: values below 1000 millicelcius don't make sense
699 * and can cause the system to go into a thermal heart attack
701 if (state && state < 1000)
704 if (state && !tz->forced_passive) {
705 mutex_lock(&thermal_list_lock);
706 list_for_each_entry(cdev, &thermal_cdev_list, node) {
707 if (!strncmp("Processor", cdev->type,
708 sizeof("Processor")))
709 thermal_zone_bind_cooling_device(tz,
710 THERMAL_TRIPS_NONE, cdev,
714 mutex_unlock(&thermal_list_lock);
715 if (!tz->passive_delay)
716 tz->passive_delay = 1000;
717 } else if (!state && tz->forced_passive) {
718 mutex_lock(&thermal_list_lock);
719 list_for_each_entry(cdev, &thermal_cdev_list, node) {
720 if (!strncmp("Processor", cdev->type,
721 sizeof("Processor")))
722 thermal_zone_unbind_cooling_device(tz,
726 mutex_unlock(&thermal_list_lock);
727 tz->passive_delay = 0;
730 tz->forced_passive = state;
732 thermal_zone_device_update(tz);
738 passive_show(struct device *dev, struct device_attribute *attr,
741 struct thermal_zone_device *tz = to_thermal_zone(dev);
743 return sprintf(buf, "%d\n", tz->forced_passive);
747 passive_delay_store(struct device *dev, struct device_attribute *attr,
748 const char *buf, size_t count)
750 struct thermal_zone_device *tz = to_thermal_zone(dev);
753 if (!sscanf(buf, "%d\n", &passive_delay))
756 tz->passive_delay = passive_delay;
757 thermal_zone_device_update(tz);
762 passive_delay_show(struct device *dev, struct device_attribute *attr,
765 struct thermal_zone_device *tz = to_thermal_zone(dev);
767 return sprintf(buf, "%d\n", tz->passive_delay);
771 polling_delay_store(struct device *dev, struct device_attribute *attr,
772 const char *buf, size_t count)
774 struct thermal_zone_device *tz = to_thermal_zone(dev);
777 if (!sscanf(buf, "%d\n", &polling_delay))
780 tz->polling_delay = polling_delay;
781 thermal_zone_device_update(tz);
786 polling_delay_show(struct device *dev, struct device_attribute *attr,
789 struct thermal_zone_device *tz = to_thermal_zone(dev);
791 return sprintf(buf, "%d\n", tz->polling_delay);
795 policy_store(struct device *dev, struct device_attribute *attr,
796 const char *buf, size_t count)
799 struct thermal_zone_device *tz = to_thermal_zone(dev);
800 struct thermal_governor *gov;
801 char name[THERMAL_NAME_LENGTH];
803 snprintf(name, sizeof(name), "%s", buf);
805 mutex_lock(&thermal_governor_lock);
807 if ((strlen(buf) >= THERMAL_NAME_LENGTH) || !sscanf(buf, "%s\n", name))
810 gov = __find_governor((const char *)strim(name));
814 if (gov == tz->governor) {
819 if (tz->governor && tz->governor->stop)
820 tz->governor->stop(tz);
823 ret = gov->start(tz);
825 if (tz->governor && tz->governor->start)
826 tz->governor->start(tz);
835 mutex_unlock(&thermal_governor_lock);
840 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
842 struct thermal_zone_device *tz = to_thermal_zone(dev);
844 return sprintf(buf, "%s\n", tz->governor->name);
848 available_policies_show(struct device *dev, struct device_attribute *devattr,
851 struct thermal_governor *pos;
854 mutex_lock(&thermal_governor_lock);
856 list_for_each_entry(pos, &thermal_governor_list, governor_list)
857 count += sprintf(buf + count, "%s ", pos->name);
858 count += sprintf(buf + count, "\n");
860 mutex_unlock(&thermal_governor_lock);
864 #ifdef CONFIG_THERMAL_EMULATION
866 emul_temp_store(struct device *dev, struct device_attribute *attr,
867 const char *buf, size_t count)
869 struct thermal_zone_device *tz = to_thermal_zone(dev);
871 unsigned long temperature;
873 if (kstrtoul(buf, 10, &temperature))
876 if (!tz->ops->set_emul_temp) {
877 mutex_lock(&tz->lock);
878 tz->emul_temperature = temperature;
879 mutex_unlock(&tz->lock);
881 ret = tz->ops->set_emul_temp(tz, temperature);
884 return ret ? ret : count;
886 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
887 #endif/*CONFIG_THERMAL_EMULATION*/
889 static DEVICE_ATTR(type, 0444, type_show, NULL);
890 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
891 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
892 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
893 static DEVICE_ATTR(passive_delay, S_IRUGO | S_IWUSR,
894 passive_delay_show, passive_delay_store);
895 static DEVICE_ATTR(polling_delay, S_IRUGO | S_IWUSR,
896 polling_delay_show, polling_delay_store);
897 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
898 static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
900 /* sys I/F for cooling device */
901 #define to_cooling_device(_dev) \
902 container_of(_dev, struct thermal_cooling_device, device)
905 thermal_cooling_device_type_show(struct device *dev,
906 struct device_attribute *attr, char *buf)
908 struct thermal_cooling_device *cdev = to_cooling_device(dev);
910 return sprintf(buf, "%s\n", cdev->type);
914 thermal_cooling_device_max_state_show(struct device *dev,
915 struct device_attribute *attr, char *buf)
917 struct thermal_cooling_device *cdev = to_cooling_device(dev);
921 ret = cdev->ops->get_max_state(cdev, &state);
924 return sprintf(buf, "%ld\n", state);
928 thermal_cooling_device_cur_state_show(struct device *dev,
929 struct device_attribute *attr, char *buf)
931 struct thermal_cooling_device *cdev = to_cooling_device(dev);
935 ret = cdev->ops->get_cur_state(cdev, &state);
938 return sprintf(buf, "%ld\n", state);
942 thermal_cooling_device_cur_state_store(struct device *dev,
943 struct device_attribute *attr,
944 const char *buf, size_t count)
946 struct thermal_cooling_device *cdev = to_cooling_device(dev);
950 if (!sscanf(buf, "%ld\n", &state))
956 result = cdev->ops->set_cur_state(cdev, state);
962 static struct device_attribute dev_attr_cdev_type =
963 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
964 static DEVICE_ATTR(max_state, 0444,
965 thermal_cooling_device_max_state_show, NULL);
966 static DEVICE_ATTR(cur_state, 0644,
967 thermal_cooling_device_cur_state_show,
968 thermal_cooling_device_cur_state_store);
971 thermal_cooling_device_trip_point_show(struct device *dev,
972 struct device_attribute *attr, char *buf)
974 struct thermal_instance *instance;
977 container_of(attr, struct thermal_instance, attr);
979 if (instance->trip == THERMAL_TRIPS_NONE)
980 return sprintf(buf, "-1\n");
982 return sprintf(buf, "%d\n", instance->trip);
985 /* Device management */
988 * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
989 * @tz: pointer to struct thermal_zone_device
990 * @trip: indicates which trip point the cooling devices is
991 * associated with in this thermal zone.
992 * @cdev: pointer to struct thermal_cooling_device
993 * @upper: the Maximum cooling state for this trip point.
994 * THERMAL_NO_LIMIT means no upper limit,
995 * and the cooling device can be in max_state.
996 * @lower: the Minimum cooling state can be used for this trip point.
997 * THERMAL_NO_LIMIT means no lower limit,
998 * and the cooling device can be in cooling state 0.
1000 * This interface function bind a thermal cooling device to the certain trip
1001 * point of a thermal zone device.
1002 * This function is usually called in the thermal zone device .bind callback.
1004 * Return: 0 on success, the proper error value otherwise.
1006 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1008 struct thermal_cooling_device *cdev,
1009 unsigned long upper, unsigned long lower)
1011 struct thermal_instance *dev;
1012 struct thermal_instance *pos;
1013 struct thermal_zone_device *pos1;
1014 struct thermal_cooling_device *pos2;
1015 unsigned long max_state;
1018 if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1021 list_for_each_entry(pos1, &thermal_tz_list, node) {
1025 list_for_each_entry(pos2, &thermal_cdev_list, node) {
1030 if (tz != pos1 || cdev != pos2)
1033 cdev->ops->get_max_state(cdev, &max_state);
1035 /* lower default 0, upper default max_state */
1036 lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1037 upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1039 if (lower > upper || upper > max_state)
1043 kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1051 dev->target = THERMAL_NO_TARGET;
1053 result = get_idr(&tz->idr, &tz->lock, &dev->id);
1057 sprintf(dev->name, "cdev%d", dev->id);
1059 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1063 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1064 sysfs_attr_init(&dev->attr.attr);
1065 dev->attr.attr.name = dev->attr_name;
1066 dev->attr.attr.mode = 0444;
1067 dev->attr.show = thermal_cooling_device_trip_point_show;
1068 result = device_create_file(&tz->device, &dev->attr);
1070 goto remove_symbol_link;
1072 mutex_lock(&tz->lock);
1073 mutex_lock(&cdev->lock);
1074 list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1075 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1080 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1081 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1083 mutex_unlock(&cdev->lock);
1084 mutex_unlock(&tz->lock);
1089 device_remove_file(&tz->device, &dev->attr);
1091 sysfs_remove_link(&tz->device.kobj, dev->name);
1093 release_idr(&tz->idr, &tz->lock, dev->id);
1098 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1101 * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1103 * @tz: pointer to a struct thermal_zone_device.
1104 * @trip: indicates which trip point the cooling devices is
1105 * associated with in this thermal zone.
1106 * @cdev: pointer to a struct thermal_cooling_device.
1108 * This interface function unbind a thermal cooling device from the certain
1109 * trip point of a thermal zone device.
1110 * This function is usually called in the thermal zone device .unbind callback.
1112 * Return: 0 on success, the proper error value otherwise.
1114 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1116 struct thermal_cooling_device *cdev)
1118 struct thermal_instance *pos, *next;
1120 mutex_lock(&tz->lock);
1121 mutex_lock(&cdev->lock);
1122 list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1123 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1124 list_del(&pos->tz_node);
1125 list_del(&pos->cdev_node);
1126 mutex_unlock(&cdev->lock);
1127 mutex_unlock(&tz->lock);
1131 mutex_unlock(&cdev->lock);
1132 mutex_unlock(&tz->lock);
1137 device_remove_file(&tz->device, &pos->attr);
1138 sysfs_remove_link(&tz->device.kobj, pos->name);
1139 release_idr(&tz->idr, &tz->lock, pos->id);
1143 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1145 static void thermal_release(struct device *dev)
1147 struct thermal_zone_device *tz;
1148 struct thermal_cooling_device *cdev;
1150 if (!strncmp(dev_name(dev), "thermal_zone",
1151 sizeof("thermal_zone") - 1)) {
1152 tz = to_thermal_zone(dev);
1154 } else if(!strncmp(dev_name(dev), "cooling_device",
1155 sizeof("cooling_device") - 1)){
1156 cdev = to_cooling_device(dev);
1161 static struct class thermal_class = {
1163 .dev_release = thermal_release,
1167 * __thermal_cooling_device_register() - register a new thermal cooling device
1168 * @np: a pointer to a device tree node.
1169 * @type: the thermal cooling device type.
1170 * @devdata: device private data.
1171 * @ops: standard thermal cooling devices callbacks.
1173 * This interface function adds a new thermal cooling device (fan/processor/...)
1174 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1175 * to all the thermal zone devices registered at the same time.
1176 * It also gives the opportunity to link the cooling device to a device tree
1177 * node, so that it can be bound to a thermal zone created out of device tree.
1179 * Return: a pointer to the created struct thermal_cooling_device or an
1180 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1182 static struct thermal_cooling_device *
1183 __thermal_cooling_device_register(struct device_node *np,
1184 char *type, void *devdata,
1185 const struct thermal_cooling_device_ops *ops)
1187 struct thermal_cooling_device *cdev;
1190 if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1191 return ERR_PTR(-EINVAL);
1193 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1194 !ops->set_cur_state)
1195 return ERR_PTR(-EINVAL);
1197 cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1199 return ERR_PTR(-ENOMEM);
1201 result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1204 return ERR_PTR(result);
1207 strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1208 mutex_init(&cdev->lock);
1209 INIT_LIST_HEAD(&cdev->thermal_instances);
1212 cdev->updated = false;
1213 cdev->device.class = &thermal_class;
1214 cdev->devdata = devdata;
1215 dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1216 result = device_register(&cdev->device);
1218 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1220 return ERR_PTR(result);
1225 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
1230 result = device_create_file(&cdev->device, &dev_attr_max_state);
1234 result = device_create_file(&cdev->device, &dev_attr_cur_state);
1238 /* Add 'this' new cdev to the global cdev list */
1239 mutex_lock(&thermal_list_lock);
1240 list_add(&cdev->node, &thermal_cdev_list);
1241 mutex_unlock(&thermal_list_lock);
1243 /* Update binding information for 'this' new cdev */
1249 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1250 device_unregister(&cdev->device);
1251 return ERR_PTR(result);
1255 * thermal_cooling_device_register() - register a new thermal cooling device
1256 * @type: the thermal cooling device type.
1257 * @devdata: device private data.
1258 * @ops: standard thermal cooling devices callbacks.
1260 * This interface function adds a new thermal cooling device (fan/processor/...)
1261 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1262 * to all the thermal zone devices registered at the same time.
1264 * Return: a pointer to the created struct thermal_cooling_device or an
1265 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1267 struct thermal_cooling_device *
1268 thermal_cooling_device_register(char *type, void *devdata,
1269 const struct thermal_cooling_device_ops *ops)
1271 return __thermal_cooling_device_register(NULL, type, devdata, ops);
1273 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1276 * thermal_of_cooling_device_register() - register an OF thermal cooling device
1277 * @np: a pointer to a device tree node.
1278 * @type: the thermal cooling device type.
1279 * @devdata: device private data.
1280 * @ops: standard thermal cooling devices callbacks.
1282 * This function will register a cooling device with device tree node reference.
1283 * This interface function adds a new thermal cooling device (fan/processor/...)
1284 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1285 * to all the thermal zone devices registered at the same time.
1287 * Return: a pointer to the created struct thermal_cooling_device or an
1288 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1290 struct thermal_cooling_device *
1291 thermal_of_cooling_device_register(struct device_node *np,
1292 char *type, void *devdata,
1293 const struct thermal_cooling_device_ops *ops)
1295 return __thermal_cooling_device_register(np, type, devdata, ops);
1297 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1300 * thermal_cooling_device_unregister - removes the registered thermal cooling device
1301 * @cdev: the thermal cooling device to remove.
1303 * thermal_cooling_device_unregister() must be called when the device is no
1306 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1309 const struct thermal_zone_params *tzp;
1310 struct thermal_zone_device *tz;
1311 struct thermal_cooling_device *pos = NULL;
1316 mutex_lock(&thermal_list_lock);
1317 list_for_each_entry(pos, &thermal_cdev_list, node)
1321 /* thermal cooling device not found */
1322 mutex_unlock(&thermal_list_lock);
1325 list_del(&cdev->node);
1327 /* Unbind all thermal zones associated with 'this' cdev */
1328 list_for_each_entry(tz, &thermal_tz_list, node) {
1329 if (tz->ops->unbind) {
1330 tz->ops->unbind(tz, cdev);
1334 if (!tz->tzp || !tz->tzp->tbp)
1338 for (i = 0; i < tzp->num_tbps; i++) {
1339 if (tzp->tbp[i].cdev == cdev) {
1340 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1341 tzp->tbp[i].cdev = NULL;
1346 mutex_unlock(&thermal_list_lock);
1349 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1350 device_remove_file(&cdev->device, &dev_attr_max_state);
1351 device_remove_file(&cdev->device, &dev_attr_cur_state);
1353 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1354 device_unregister(&cdev->device);
1357 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1359 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1361 struct thermal_instance *instance;
1362 unsigned long target = 0;
1364 /* cooling device is updated*/
1368 mutex_lock(&cdev->lock);
1369 /* Make sure cdev enters the deepest cooling state */
1370 list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1371 if (instance->target == THERMAL_NO_TARGET)
1373 if (instance->target > target)
1374 target = instance->target;
1376 mutex_unlock(&cdev->lock);
1377 cdev->ops->set_cur_state(cdev, target);
1378 trace_cooling_device_update(cdev->type, target);
1379 cdev->updated = true;
1381 EXPORT_SYMBOL(thermal_cdev_update);
1384 * thermal_notify_framework - Sensor drivers use this API to notify framework
1385 * @tz: thermal zone device
1386 * @trip: indicates which trip point has been crossed
1388 * This function handles the trip events from sensor drivers. It starts
1389 * throttling the cooling devices according to the policy configured.
1390 * For CRITICAL and HOT trip points, this notifies the respective drivers,
1391 * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1392 * The throttling policy is based on the configured platform data; if no
1393 * platform data is provided, this uses the step_wise throttling policy.
1395 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1397 handle_thermal_trip(tz, trip);
1399 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1401 struct thermal_zone_device *thermal_zone_device_find(void *data,
1402 int (*match)(struct thermal_zone_device *, void *))
1404 struct thermal_zone_device *thz;
1406 mutex_lock(&thermal_list_lock);
1407 list_for_each_entry(thz, &thermal_tz_list, node)
1408 if (match(thz, data)) {
1409 mutex_unlock(&thermal_list_lock);
1413 mutex_unlock(&thermal_list_lock);
1416 EXPORT_SYMBOL(thermal_zone_device_find);
1418 struct thermal_zone_device *thermal_zone_device_find_by_name(const char *name)
1420 struct thermal_zone_device *thz;
1425 mutex_lock(&thermal_list_lock);
1426 list_for_each_entry(thz, &thermal_tz_list, node) {
1427 if (!strncmp(name, thz->type, strlen(name))) {
1428 mutex_unlock(&thermal_list_lock);
1432 mutex_unlock(&thermal_list_lock);
1435 EXPORT_SYMBOL(thermal_zone_device_find_by_name);
1438 * create_trip_attrs() - create attributes for trip points
1439 * @tz: the thermal zone device
1440 * @mask: Writeable trip point bitmap.
1442 * helper function to instantiate sysfs entries for every trip
1443 * point and its properties of a struct thermal_zone_device.
1445 * Return: 0 on success, the proper error value otherwise.
1447 static int create_trip_attrs(struct thermal_zone_device *tz, u64 mask)
1450 int size = sizeof(struct thermal_attr) * tz->trips;
1452 tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1453 if (!tz->trip_type_attrs)
1456 tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1457 if (!tz->trip_temp_attrs) {
1458 kfree(tz->trip_type_attrs);
1462 if (tz->ops->get_trip_hyst) {
1463 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1464 if (!tz->trip_hyst_attrs) {
1465 kfree(tz->trip_type_attrs);
1466 kfree(tz->trip_temp_attrs);
1472 for (indx = 0; indx < tz->trips; indx++) {
1473 /* create trip type attribute */
1474 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1475 "trip_point_%d_type", indx);
1477 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1478 tz->trip_type_attrs[indx].attr.attr.name =
1479 tz->trip_type_attrs[indx].name;
1480 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1481 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1483 device_create_file(&tz->device,
1484 &tz->trip_type_attrs[indx].attr);
1486 /* create trip temp attribute */
1487 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1488 "trip_point_%d_temp", indx);
1490 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1491 tz->trip_temp_attrs[indx].attr.attr.name =
1492 tz->trip_temp_attrs[indx].name;
1493 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1494 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1495 if (mask & (1ULL << indx)) {
1496 tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1497 tz->trip_temp_attrs[indx].attr.store =
1498 trip_point_temp_store;
1501 device_create_file(&tz->device,
1502 &tz->trip_temp_attrs[indx].attr);
1504 /* create Optional trip hyst attribute */
1505 if (!tz->ops->get_trip_hyst)
1507 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1508 "trip_point_%d_hyst", indx);
1510 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1511 tz->trip_hyst_attrs[indx].attr.attr.name =
1512 tz->trip_hyst_attrs[indx].name;
1513 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1514 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1515 if (tz->ops->set_trip_hyst) {
1516 tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1517 tz->trip_hyst_attrs[indx].attr.store =
1518 trip_point_hyst_store;
1521 device_create_file(&tz->device,
1522 &tz->trip_hyst_attrs[indx].attr);
1527 static void remove_trip_attrs(struct thermal_zone_device *tz)
1531 for (indx = 0; indx < tz->trips; indx++) {
1532 device_remove_file(&tz->device,
1533 &tz->trip_type_attrs[indx].attr);
1534 device_remove_file(&tz->device,
1535 &tz->trip_temp_attrs[indx].attr);
1536 if (tz->ops->get_trip_hyst)
1537 device_remove_file(&tz->device,
1538 &tz->trip_hyst_attrs[indx].attr);
1540 kfree(tz->trip_type_attrs);
1541 kfree(tz->trip_temp_attrs);
1542 kfree(tz->trip_hyst_attrs);
1546 * thermal_zone_device_register() - register a new thermal zone device
1547 * @type: the thermal zone device type
1548 * @trips: the number of trip points the thermal zone support
1549 * @mask: a bit string indicating the writeablility of trip points
1550 * @devdata: private device data
1551 * @ops: standard thermal zone device callbacks
1552 * @tzp: thermal zone platform parameters
1553 * @passive_delay: number of milliseconds to wait between polls when
1554 * performing passive cooling
1555 * @polling_delay: number of milliseconds to wait between polls when checking
1556 * whether trip points have been crossed (0 for interrupt
1559 * This interface function adds a new thermal zone device (sensor) to
1560 * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1561 * thermal cooling devices registered at the same time.
1562 * thermal_zone_device_unregister() must be called when the device is no
1563 * longer needed. The passive cooling depends on the .get_trend() return value.
1565 * Return: a pointer to the created struct thermal_zone_device or an
1566 * in case of error, an ERR_PTR. Caller must check return value with
1567 * IS_ERR*() helpers.
1569 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1570 int trips, u64 mask, void *devdata,
1571 struct thermal_zone_device_ops *ops,
1572 const struct thermal_zone_params *tzp,
1573 int passive_delay, int polling_delay)
1575 struct thermal_zone_device *tz;
1576 enum thermal_trip_type trip_type;
1581 if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1582 return ERR_PTR(-EINVAL);
1584 if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1585 return ERR_PTR(-EINVAL);
1588 return ERR_PTR(-EINVAL);
1590 if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1591 return ERR_PTR(-EINVAL);
1593 tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1595 return ERR_PTR(-ENOMEM);
1597 INIT_LIST_HEAD(&tz->thermal_instances);
1599 mutex_init(&tz->lock);
1600 result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1603 return ERR_PTR(result);
1606 strlcpy(tz->type, type ? : "", sizeof(tz->type));
1609 tz->device.class = &thermal_class;
1610 tz->devdata = devdata;
1612 tz->passive_delay = passive_delay;
1613 tz->polling_delay = polling_delay;
1615 dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1616 result = device_register(&tz->device);
1618 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1620 return ERR_PTR(result);
1625 result = device_create_file(&tz->device, &dev_attr_type);
1630 result = device_create_file(&tz->device, &dev_attr_temp);
1634 if (ops->get_mode) {
1635 result = device_create_file(&tz->device, &dev_attr_mode);
1640 result = create_trip_attrs(tz, mask);
1644 for (count = 0; count < trips; count++) {
1645 tz->ops->get_trip_type(tz, count, &trip_type);
1646 if (trip_type == THERMAL_TRIP_PASSIVE)
1651 result = device_create_file(&tz->device, &dev_attr_passive);
1656 #ifdef CONFIG_THERMAL_EMULATION
1657 result = device_create_file(&tz->device, &dev_attr_emul_temp);
1661 /* Create policy attribute */
1662 result = device_create_file(&tz->device, &dev_attr_policy);
1666 /* Create passive_delay attribute */
1667 result = device_create_file(&tz->device, &dev_attr_passive_delay);
1671 /* Create polling_delay attribute */
1672 result = device_create_file(&tz->device, &dev_attr_polling_delay);
1676 /* Create available_policies attribute */
1677 result = device_create_file(&tz->device, &dev_attr_available_policies);
1681 /* Update 'this' zone's governor information */
1682 mutex_lock(&thermal_governor_lock);
1685 tz->governor = __find_governor(tz->tzp->governor_name);
1687 if (!tz->governor) {
1688 tz->governor = __find_governor(DEFAULT_THERMAL_GOVERNOR);
1689 if (!tz->governor) {
1690 mutex_unlock(&thermal_governor_lock);
1695 if (tz->governor->start) {
1696 result = tz->governor->start(tz);
1698 mutex_unlock(&thermal_governor_lock);
1703 mutex_unlock(&thermal_governor_lock);
1705 if (!tz->tzp || !tz->tzp->no_hwmon) {
1706 result = thermal_add_hwmon_sysfs(tz);
1711 mutex_lock(&thermal_list_lock);
1712 list_add_tail(&tz->node, &thermal_tz_list);
1713 mutex_unlock(&thermal_list_lock);
1715 /* Bind cooling devices for this zone */
1718 INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1720 if (!tz->ops->get_temp)
1721 thermal_zone_device_set_polling(tz, 0);
1723 thermal_zone_device_update(tz);
1725 dev_info(&tz->device, "Registering thermal zone %s for type %s\n",
1726 dev_name(&tz->device), type);
1731 if (tz->governor && tz->governor->stop)
1732 tz->governor->stop(tz);
1733 tz->governor = NULL;
1734 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1735 device_unregister(&tz->device);
1736 return ERR_PTR(result);
1738 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1741 * thermal_device_unregister - removes the registered thermal zone device
1742 * @tz: the thermal zone device to remove
1744 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1747 const struct thermal_zone_params *tzp;
1748 struct thermal_cooling_device *cdev;
1749 struct thermal_zone_device *pos = NULL;
1756 mutex_lock(&thermal_list_lock);
1757 list_for_each_entry(pos, &thermal_tz_list, node)
1761 /* thermal zone device not found */
1762 mutex_unlock(&thermal_list_lock);
1765 list_del(&tz->node);
1767 /* Unbind all cdevs associated with 'this' thermal zone */
1768 list_for_each_entry(cdev, &thermal_cdev_list, node) {
1769 if (tz->ops->unbind) {
1770 tz->ops->unbind(tz, cdev);
1774 if (!tzp || !tzp->tbp)
1777 for (i = 0; i < tzp->num_tbps; i++) {
1778 if (tzp->tbp[i].cdev == cdev) {
1779 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1780 tzp->tbp[i].cdev = NULL;
1785 mutex_unlock(&thermal_list_lock);
1787 thermal_zone_device_set_polling(tz, 0);
1790 device_remove_file(&tz->device, &dev_attr_type);
1791 device_remove_file(&tz->device, &dev_attr_temp);
1792 if (tz->ops->get_mode)
1793 device_remove_file(&tz->device, &dev_attr_mode);
1794 device_remove_file(&tz->device, &dev_attr_passive_delay);
1795 device_remove_file(&tz->device, &dev_attr_polling_delay);
1796 device_remove_file(&tz->device, &dev_attr_policy);
1797 device_remove_file(&tz->device, &dev_attr_available_policies);
1798 remove_trip_attrs(tz);
1800 if (tz->governor && tz->governor->stop)
1801 tz->governor->stop(tz);
1802 tz->governor = NULL;
1804 thermal_remove_hwmon_sysfs(tz);
1805 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1806 idr_destroy(&tz->idr);
1807 mutex_destroy(&tz->lock);
1808 device_unregister(&tz->device);
1811 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
1814 * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1815 * @name: thermal zone name to fetch the temperature
1817 * When only one zone is found with the passed name, returns a reference to it.
1819 * Return: On success returns a reference to an unique thermal zone with
1820 * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1821 * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1823 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1825 struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1826 unsigned int found = 0;
1831 mutex_lock(&thermal_list_lock);
1832 list_for_each_entry(pos, &thermal_tz_list, node)
1833 if (!strnicmp(name, pos->type, THERMAL_NAME_LENGTH)) {
1837 mutex_unlock(&thermal_list_lock);
1839 /* nothing has been found, thus an error code for it */
1841 ref = ERR_PTR(-ENODEV);
1843 /* Success only when an unique zone is found */
1844 ref = ERR_PTR(-EEXIST);
1849 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
1852 static struct genl_family thermal_event_genl_family = {
1853 .id = GENL_ID_GENERATE,
1854 .name = THERMAL_GENL_FAMILY_NAME,
1855 .version = THERMAL_GENL_VERSION,
1856 .maxattr = THERMAL_GENL_ATTR_MAX,
1859 static struct genl_multicast_group thermal_event_mcgrp = {
1860 .name = THERMAL_GENL_MCAST_GROUP_NAME,
1863 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
1864 enum events event, int temp)
1866 struct sk_buff *skb;
1867 struct nlattr *attr;
1868 struct thermal_genl_event *thermal_event;
1872 static unsigned int thermal_event_seqnum;
1877 /* allocate memory */
1878 size = nla_total_size(sizeof(struct thermal_genl_event)) +
1881 skb = genlmsg_new(size, GFP_ATOMIC);
1885 /* add the genetlink message header */
1886 msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1887 &thermal_event_genl_family, 0,
1888 THERMAL_GENL_CMD_EVENT);
1895 attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1896 sizeof(struct thermal_genl_event));
1903 thermal_event = nla_data(attr);
1904 if (!thermal_event) {
1909 memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1911 thermal_event->orig = tz->id;
1912 thermal_event->event = event;
1913 thermal_event->temp = temp;
1915 /* send multicast genetlink message */
1916 result = genlmsg_end(skb, msg_header);
1922 genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1925 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
1927 static int genetlink_init(void)
1931 result = genl_register_family(&thermal_event_genl_family);
1935 result = genl_register_mc_group(&thermal_event_genl_family,
1936 &thermal_event_mcgrp);
1938 genl_unregister_family(&thermal_event_genl_family);
1942 static void genetlink_exit(void)
1944 genl_unregister_family(&thermal_event_genl_family);
1946 #else /* !CONFIG_NET */
1947 static inline int genetlink_init(void) { return 0; }
1948 static inline void genetlink_exit(void) {}
1949 #endif /* !CONFIG_NET */
1951 static int __init thermal_register_governors(void)
1955 result = thermal_gov_step_wise_register();
1959 result = thermal_gov_fair_share_register();
1963 result = pid_thermal_gov_register();
1967 return thermal_gov_user_space_register();
1970 static void thermal_unregister_governors(void)
1972 thermal_gov_step_wise_unregister();
1973 thermal_gov_fair_share_unregister();
1974 pid_thermal_gov_unregister();
1975 thermal_gov_user_space_unregister();
1978 static int __init thermal_init(void)
1982 result = thermal_register_governors();
1986 result = class_register(&thermal_class);
1988 goto unregister_governors;
1990 result = genetlink_init();
1992 goto unregister_class;
1994 result = of_parse_thermal_zones();
2002 unregister_governors:
2003 thermal_unregister_governors();
2005 class_unregister(&thermal_class);
2007 idr_destroy(&thermal_tz_idr);
2008 idr_destroy(&thermal_cdev_idr);
2009 mutex_destroy(&thermal_idr_lock);
2010 mutex_destroy(&thermal_list_lock);
2011 mutex_destroy(&thermal_governor_lock);
2015 static void __exit thermal_exit(void)
2017 of_thermal_destroy_zones();
2019 class_unregister(&thermal_class);
2020 thermal_unregister_governors();
2021 idr_destroy(&thermal_tz_idr);
2022 idr_destroy(&thermal_cdev_idr);
2023 mutex_destroy(&thermal_idr_lock);
2024 mutex_destroy(&thermal_list_lock);
2025 mutex_destroy(&thermal_governor_lock);
2028 fs_initcall(thermal_init);
2029 module_exit(thermal_exit);