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>
41 #define CREATE_TRACE_POINTS
42 #include <trace/events/thermal.h>
44 #include "thermal_core.h"
45 #include "thermal_hwmon.h"
47 MODULE_AUTHOR("Zhang Rui");
48 MODULE_DESCRIPTION("Generic thermal management sysfs support");
49 MODULE_LICENSE("GPL v2");
51 static DEFINE_IDR(thermal_tz_idr);
52 static DEFINE_IDR(thermal_cdev_idr);
53 static DEFINE_MUTEX(thermal_idr_lock);
55 static LIST_HEAD(thermal_tz_list);
56 static LIST_HEAD(thermal_cdev_list);
57 static LIST_HEAD(thermal_governor_list);
59 static DEFINE_MUTEX(thermal_list_lock);
60 static DEFINE_MUTEX(thermal_governor_lock);
62 static struct thermal_governor *def_governor;
64 static struct thermal_governor *__find_governor(const char *name)
66 struct thermal_governor *pos;
68 if (!name || !name[0])
71 list_for_each_entry(pos, &thermal_governor_list, governor_list)
72 if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH))
78 int thermal_register_governor(struct thermal_governor *governor)
82 struct thermal_zone_device *pos;
87 mutex_lock(&thermal_governor_lock);
90 if (__find_governor(governor->name) == NULL) {
92 list_add(&governor->governor_list, &thermal_governor_list);
93 if (!def_governor && !strncmp(governor->name,
94 DEFAULT_THERMAL_GOVERNOR, THERMAL_NAME_LENGTH))
95 def_governor = governor;
98 mutex_lock(&thermal_list_lock);
100 list_for_each_entry(pos, &thermal_tz_list, node) {
102 * only thermal zones with specified tz->tzp->governor_name
103 * may run with tz->govenor unset
108 name = pos->tzp->governor_name;
110 if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH))
111 pos->governor = governor;
114 mutex_unlock(&thermal_list_lock);
115 mutex_unlock(&thermal_governor_lock);
120 void thermal_unregister_governor(struct thermal_governor *governor)
122 struct thermal_zone_device *pos;
127 mutex_lock(&thermal_governor_lock);
129 if (__find_governor(governor->name) == NULL)
132 mutex_lock(&thermal_list_lock);
134 list_for_each_entry(pos, &thermal_tz_list, node) {
135 if (!strncasecmp(pos->governor->name, governor->name,
136 THERMAL_NAME_LENGTH))
137 pos->governor = NULL;
140 mutex_unlock(&thermal_list_lock);
141 list_del(&governor->governor_list);
143 mutex_unlock(&thermal_governor_lock);
147 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
153 ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
156 if (unlikely(ret < 0))
162 static void release_idr(struct idr *idr, struct mutex *lock, int id)
171 int get_tz_trend(struct thermal_zone_device *tz, int trip)
173 enum thermal_trend trend;
175 if (tz->emul_temperature || !tz->ops->get_trend ||
176 tz->ops->get_trend(tz, trip, &trend)) {
177 if (tz->temperature > tz->last_temperature)
178 trend = THERMAL_TREND_RAISING;
179 else if (tz->temperature < tz->last_temperature)
180 trend = THERMAL_TREND_DROPPING;
182 trend = THERMAL_TREND_STABLE;
187 EXPORT_SYMBOL(get_tz_trend);
189 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
190 struct thermal_cooling_device *cdev, int trip)
192 struct thermal_instance *pos = NULL;
193 struct thermal_instance *target_instance = NULL;
195 mutex_lock(&tz->lock);
196 mutex_lock(&cdev->lock);
198 list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
199 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
200 target_instance = pos;
205 mutex_unlock(&cdev->lock);
206 mutex_unlock(&tz->lock);
208 return target_instance;
210 EXPORT_SYMBOL(get_thermal_instance);
212 static void print_bind_err_msg(struct thermal_zone_device *tz,
213 struct thermal_cooling_device *cdev, int ret)
215 dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
216 tz->type, cdev->type, ret);
219 static void __bind(struct thermal_zone_device *tz, int mask,
220 struct thermal_cooling_device *cdev,
221 unsigned long *limits)
225 for (i = 0; i < tz->trips; i++) {
226 if (mask & (1 << i)) {
227 unsigned long upper, lower;
229 upper = THERMAL_NO_LIMIT;
230 lower = THERMAL_NO_LIMIT;
232 lower = limits[i * 2];
233 upper = limits[i * 2 + 1];
235 ret = thermal_zone_bind_cooling_device(tz, i, cdev,
238 print_bind_err_msg(tz, cdev, ret);
243 static void __unbind(struct thermal_zone_device *tz, int mask,
244 struct thermal_cooling_device *cdev)
248 for (i = 0; i < tz->trips; i++)
250 thermal_zone_unbind_cooling_device(tz, i, cdev);
253 static void bind_cdev(struct thermal_cooling_device *cdev)
256 const struct thermal_zone_params *tzp;
257 struct thermal_zone_device *pos = NULL;
259 mutex_lock(&thermal_list_lock);
261 list_for_each_entry(pos, &thermal_tz_list, node) {
262 if (!pos->tzp && !pos->ops->bind)
265 if (pos->ops->bind) {
266 ret = pos->ops->bind(pos, cdev);
268 print_bind_err_msg(pos, cdev, ret);
273 if (!tzp || !tzp->tbp)
276 for (i = 0; i < tzp->num_tbps; i++) {
277 if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
279 if (tzp->tbp[i].match(pos, cdev))
281 tzp->tbp[i].cdev = cdev;
282 __bind(pos, tzp->tbp[i].trip_mask, cdev,
283 tzp->tbp[i].binding_limits);
287 mutex_unlock(&thermal_list_lock);
290 static void bind_tz(struct thermal_zone_device *tz)
293 struct thermal_cooling_device *pos = NULL;
294 const struct thermal_zone_params *tzp = tz->tzp;
296 if (!tzp && !tz->ops->bind)
299 mutex_lock(&thermal_list_lock);
301 /* If there is ops->bind, try to use ops->bind */
303 list_for_each_entry(pos, &thermal_cdev_list, node) {
304 ret = tz->ops->bind(tz, pos);
306 print_bind_err_msg(tz, pos, ret);
311 if (!tzp || !tzp->tbp)
314 list_for_each_entry(pos, &thermal_cdev_list, node) {
315 for (i = 0; i < tzp->num_tbps; i++) {
316 if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
318 if (tzp->tbp[i].match(tz, pos))
320 tzp->tbp[i].cdev = pos;
321 __bind(tz, tzp->tbp[i].trip_mask, pos,
322 tzp->tbp[i].binding_limits);
326 mutex_unlock(&thermal_list_lock);
329 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
333 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
334 round_jiffies(msecs_to_jiffies(delay)));
336 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
337 msecs_to_jiffies(delay));
339 cancel_delayed_work(&tz->poll_queue);
342 static void monitor_thermal_zone(struct thermal_zone_device *tz)
344 mutex_lock(&tz->lock);
347 thermal_zone_device_set_polling(tz, tz->passive_delay);
348 else if (tz->polling_delay)
349 thermal_zone_device_set_polling(tz, tz->polling_delay);
351 thermal_zone_device_set_polling(tz, 0);
353 mutex_unlock(&tz->lock);
356 static void handle_non_critical_trips(struct thermal_zone_device *tz,
357 int trip, enum thermal_trip_type trip_type)
359 tz->governor ? tz->governor->throttle(tz, trip) :
360 def_governor->throttle(tz, trip);
363 static void handle_critical_trips(struct thermal_zone_device *tz,
364 int trip, enum thermal_trip_type trip_type)
368 tz->ops->get_trip_temp(tz, trip, &trip_temp);
370 /* If we have not crossed the trip_temp, we do not care. */
371 if (trip_temp <= 0 || tz->temperature < trip_temp)
374 trace_thermal_zone_trip(tz, trip, trip_type);
377 tz->ops->notify(tz, trip, trip_type);
379 if (trip_type == THERMAL_TRIP_CRITICAL) {
380 dev_emerg(&tz->device,
381 "critical temperature reached(%d C),shutting down\n",
382 tz->temperature / 1000);
383 orderly_poweroff(true);
387 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
389 enum thermal_trip_type type;
391 tz->ops->get_trip_type(tz, trip, &type);
393 if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
394 handle_critical_trips(tz, trip, type);
396 handle_non_critical_trips(tz, trip, type);
398 * Alright, we handled this trip successfully.
399 * So, start monitoring again.
401 monitor_thermal_zone(tz);
405 * thermal_zone_get_temp() - returns its the temperature of thermal zone
406 * @tz: a valid pointer to a struct thermal_zone_device
407 * @temp: a valid pointer to where to store the resulting temperature.
409 * When a valid thermal zone reference is passed, it will fetch its
410 * temperature and fill @temp.
412 * Return: On success returns 0, an error code otherwise
414 int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
417 #ifdef CONFIG_THERMAL_EMULATION
419 unsigned long crit_temp = -1UL;
420 enum thermal_trip_type type;
423 if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
426 mutex_lock(&tz->lock);
428 ret = tz->ops->get_temp(tz, temp);
429 #ifdef CONFIG_THERMAL_EMULATION
430 if (!tz->emul_temperature)
433 for (count = 0; count < tz->trips; count++) {
434 ret = tz->ops->get_trip_type(tz, count, &type);
435 if (!ret && type == THERMAL_TRIP_CRITICAL) {
436 ret = tz->ops->get_trip_temp(tz, count, &crit_temp);
444 if (*temp < crit_temp)
445 *temp = tz->emul_temperature;
448 mutex_unlock(&tz->lock);
452 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
454 static void update_temperature(struct thermal_zone_device *tz)
459 ret = thermal_zone_get_temp(tz, &temp);
461 dev_warn(&tz->device, "failed to read out thermal zone %d\n",
466 mutex_lock(&tz->lock);
467 tz->last_temperature = tz->temperature;
468 tz->temperature = temp;
469 mutex_unlock(&tz->lock);
471 trace_thermal_temperature(tz);
472 dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
473 tz->last_temperature, tz->temperature);
476 void thermal_zone_device_update(struct thermal_zone_device *tz)
480 if (!tz->ops->get_temp)
483 update_temperature(tz);
485 for (count = 0; count < tz->trips; count++)
486 handle_thermal_trip(tz, count);
488 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
490 static void thermal_zone_device_check(struct work_struct *work)
492 struct thermal_zone_device *tz = container_of(work, struct
495 thermal_zone_device_update(tz);
498 /* sys I/F for thermal zone */
500 #define to_thermal_zone(_dev) \
501 container_of(_dev, struct thermal_zone_device, device)
504 type_show(struct device *dev, struct device_attribute *attr, char *buf)
506 struct thermal_zone_device *tz = to_thermal_zone(dev);
508 return sprintf(buf, "%s\n", tz->type);
512 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
514 struct thermal_zone_device *tz = to_thermal_zone(dev);
518 ret = thermal_zone_get_temp(tz, &temperature);
523 return sprintf(buf, "%ld\n", temperature);
527 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
529 struct thermal_zone_device *tz = to_thermal_zone(dev);
530 enum thermal_device_mode mode;
533 if (!tz->ops->get_mode)
536 result = tz->ops->get_mode(tz, &mode);
540 return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
545 mode_store(struct device *dev, struct device_attribute *attr,
546 const char *buf, size_t count)
548 struct thermal_zone_device *tz = to_thermal_zone(dev);
551 if (!tz->ops->set_mode)
554 if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
555 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
556 else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
557 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
568 trip_point_type_show(struct device *dev, struct device_attribute *attr,
571 struct thermal_zone_device *tz = to_thermal_zone(dev);
572 enum thermal_trip_type type;
575 if (!tz->ops->get_trip_type)
578 if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
581 result = tz->ops->get_trip_type(tz, trip, &type);
586 case THERMAL_TRIP_CRITICAL:
587 return sprintf(buf, "critical\n");
588 case THERMAL_TRIP_HOT:
589 return sprintf(buf, "hot\n");
590 case THERMAL_TRIP_PASSIVE:
591 return sprintf(buf, "passive\n");
592 case THERMAL_TRIP_ACTIVE:
593 return sprintf(buf, "active\n");
595 return sprintf(buf, "unknown\n");
600 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
601 const char *buf, size_t count)
603 struct thermal_zone_device *tz = to_thermal_zone(dev);
605 unsigned long temperature;
607 if (!tz->ops->set_trip_temp)
610 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
613 if (kstrtoul(buf, 10, &temperature))
616 ret = tz->ops->set_trip_temp(tz, trip, temperature);
618 return ret ? ret : count;
622 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
625 struct thermal_zone_device *tz = to_thermal_zone(dev);
629 if (!tz->ops->get_trip_temp)
632 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
635 ret = tz->ops->get_trip_temp(tz, trip, &temperature);
640 return sprintf(buf, "%ld\n", temperature);
644 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
645 const char *buf, size_t count)
647 struct thermal_zone_device *tz = to_thermal_zone(dev);
649 unsigned long temperature;
651 if (!tz->ops->set_trip_hyst)
654 if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
657 if (kstrtoul(buf, 10, &temperature))
661 * We are not doing any check on the 'temperature' value
662 * here. The driver implementing 'set_trip_hyst' has to
665 ret = tz->ops->set_trip_hyst(tz, trip, temperature);
667 return ret ? ret : count;
671 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
674 struct thermal_zone_device *tz = to_thermal_zone(dev);
676 unsigned long temperature;
678 if (!tz->ops->get_trip_hyst)
681 if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
684 ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
686 return ret ? ret : sprintf(buf, "%ld\n", temperature);
690 passive_store(struct device *dev, struct device_attribute *attr,
691 const char *buf, size_t count)
693 struct thermal_zone_device *tz = to_thermal_zone(dev);
694 struct thermal_cooling_device *cdev = NULL;
697 if (!sscanf(buf, "%d\n", &state))
700 /* sanity check: values below 1000 millicelcius don't make sense
701 * and can cause the system to go into a thermal heart attack
703 if (state && state < 1000)
706 if (state && !tz->forced_passive) {
707 mutex_lock(&thermal_list_lock);
708 list_for_each_entry(cdev, &thermal_cdev_list, node) {
709 if (!strncmp("Processor", cdev->type,
710 sizeof("Processor")))
711 thermal_zone_bind_cooling_device(tz,
712 THERMAL_TRIPS_NONE, cdev,
716 mutex_unlock(&thermal_list_lock);
717 if (!tz->passive_delay)
718 tz->passive_delay = 1000;
719 } else if (!state && tz->forced_passive) {
720 mutex_lock(&thermal_list_lock);
721 list_for_each_entry(cdev, &thermal_cdev_list, node) {
722 if (!strncmp("Processor", cdev->type,
723 sizeof("Processor")))
724 thermal_zone_unbind_cooling_device(tz,
728 mutex_unlock(&thermal_list_lock);
729 tz->passive_delay = 0;
732 tz->forced_passive = state;
734 thermal_zone_device_update(tz);
740 passive_show(struct device *dev, struct device_attribute *attr,
743 struct thermal_zone_device *tz = to_thermal_zone(dev);
745 return sprintf(buf, "%d\n", tz->forced_passive);
749 policy_store(struct device *dev, struct device_attribute *attr,
750 const char *buf, size_t count)
753 struct thermal_zone_device *tz = to_thermal_zone(dev);
754 struct thermal_governor *gov;
755 char name[THERMAL_NAME_LENGTH];
757 snprintf(name, sizeof(name), "%s", buf);
759 mutex_lock(&thermal_governor_lock);
760 mutex_lock(&tz->lock);
762 gov = __find_governor(strim(name));
770 mutex_unlock(&tz->lock);
771 mutex_unlock(&thermal_governor_lock);
776 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
778 struct thermal_zone_device *tz = to_thermal_zone(dev);
780 return sprintf(buf, "%s\n", tz->governor->name);
783 #ifdef CONFIG_THERMAL_EMULATION
785 emul_temp_store(struct device *dev, struct device_attribute *attr,
786 const char *buf, size_t count)
788 struct thermal_zone_device *tz = to_thermal_zone(dev);
790 unsigned long temperature;
792 if (kstrtoul(buf, 10, &temperature))
795 if (!tz->ops->set_emul_temp) {
796 mutex_lock(&tz->lock);
797 tz->emul_temperature = temperature;
798 mutex_unlock(&tz->lock);
800 ret = tz->ops->set_emul_temp(tz, temperature);
804 thermal_zone_device_update(tz);
806 return ret ? ret : count;
808 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
809 #endif/*CONFIG_THERMAL_EMULATION*/
811 static DEVICE_ATTR(type, 0444, type_show, NULL);
812 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
813 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
814 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
815 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
817 /* sys I/F for cooling device */
818 #define to_cooling_device(_dev) \
819 container_of(_dev, struct thermal_cooling_device, device)
822 thermal_cooling_device_type_show(struct device *dev,
823 struct device_attribute *attr, char *buf)
825 struct thermal_cooling_device *cdev = to_cooling_device(dev);
827 return sprintf(buf, "%s\n", cdev->type);
831 thermal_cooling_device_max_state_show(struct device *dev,
832 struct device_attribute *attr, char *buf)
834 struct thermal_cooling_device *cdev = to_cooling_device(dev);
838 ret = cdev->ops->get_max_state(cdev, &state);
841 return sprintf(buf, "%ld\n", state);
845 thermal_cooling_device_cur_state_show(struct device *dev,
846 struct device_attribute *attr, char *buf)
848 struct thermal_cooling_device *cdev = to_cooling_device(dev);
852 ret = cdev->ops->get_cur_state(cdev, &state);
855 return sprintf(buf, "%ld\n", state);
859 thermal_cooling_device_cur_state_store(struct device *dev,
860 struct device_attribute *attr,
861 const char *buf, size_t count)
863 struct thermal_cooling_device *cdev = to_cooling_device(dev);
867 if (!sscanf(buf, "%ld\n", &state))
873 result = cdev->ops->set_cur_state(cdev, state);
879 static struct device_attribute dev_attr_cdev_type =
880 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
881 static DEVICE_ATTR(max_state, 0444,
882 thermal_cooling_device_max_state_show, NULL);
883 static DEVICE_ATTR(cur_state, 0644,
884 thermal_cooling_device_cur_state_show,
885 thermal_cooling_device_cur_state_store);
888 thermal_cooling_device_trip_point_show(struct device *dev,
889 struct device_attribute *attr, char *buf)
891 struct thermal_instance *instance;
894 container_of(attr, struct thermal_instance, attr);
896 if (instance->trip == THERMAL_TRIPS_NONE)
897 return sprintf(buf, "-1\n");
899 return sprintf(buf, "%d\n", instance->trip);
902 /* Device management */
905 * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
906 * @tz: pointer to struct thermal_zone_device
907 * @trip: indicates which trip point the cooling devices is
908 * associated with in this thermal zone.
909 * @cdev: pointer to struct thermal_cooling_device
910 * @upper: the Maximum cooling state for this trip point.
911 * THERMAL_NO_LIMIT means no upper limit,
912 * and the cooling device can be in max_state.
913 * @lower: the Minimum cooling state can be used for this trip point.
914 * THERMAL_NO_LIMIT means no lower limit,
915 * and the cooling device can be in cooling state 0.
917 * This interface function bind a thermal cooling device to the certain trip
918 * point of a thermal zone device.
919 * This function is usually called in the thermal zone device .bind callback.
921 * Return: 0 on success, the proper error value otherwise.
923 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
925 struct thermal_cooling_device *cdev,
926 unsigned long upper, unsigned long lower)
928 struct thermal_instance *dev;
929 struct thermal_instance *pos;
930 struct thermal_zone_device *pos1;
931 struct thermal_cooling_device *pos2;
932 unsigned long max_state;
935 if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
938 list_for_each_entry(pos1, &thermal_tz_list, node) {
942 list_for_each_entry(pos2, &thermal_cdev_list, node) {
947 if (tz != pos1 || cdev != pos2)
950 ret = cdev->ops->get_max_state(cdev, &max_state);
954 /* lower default 0, upper default max_state */
955 lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
956 upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
958 if (lower > upper || upper > max_state)
962 kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
970 dev->target = THERMAL_NO_TARGET;
972 result = get_idr(&tz->idr, &tz->lock, &dev->id);
976 sprintf(dev->name, "cdev%d", dev->id);
978 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
982 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
983 sysfs_attr_init(&dev->attr.attr);
984 dev->attr.attr.name = dev->attr_name;
985 dev->attr.attr.mode = 0444;
986 dev->attr.show = thermal_cooling_device_trip_point_show;
987 result = device_create_file(&tz->device, &dev->attr);
989 goto remove_symbol_link;
991 mutex_lock(&tz->lock);
992 mutex_lock(&cdev->lock);
993 list_for_each_entry(pos, &tz->thermal_instances, tz_node)
994 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
999 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1000 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1002 mutex_unlock(&cdev->lock);
1003 mutex_unlock(&tz->lock);
1008 device_remove_file(&tz->device, &dev->attr);
1010 sysfs_remove_link(&tz->device.kobj, dev->name);
1012 release_idr(&tz->idr, &tz->lock, dev->id);
1017 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1020 * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1022 * @tz: pointer to a struct thermal_zone_device.
1023 * @trip: indicates which trip point the cooling devices is
1024 * associated with in this thermal zone.
1025 * @cdev: pointer to a struct thermal_cooling_device.
1027 * This interface function unbind a thermal cooling device from the certain
1028 * trip point of a thermal zone device.
1029 * This function is usually called in the thermal zone device .unbind callback.
1031 * Return: 0 on success, the proper error value otherwise.
1033 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1035 struct thermal_cooling_device *cdev)
1037 struct thermal_instance *pos, *next;
1039 mutex_lock(&tz->lock);
1040 mutex_lock(&cdev->lock);
1041 list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1042 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1043 list_del(&pos->tz_node);
1044 list_del(&pos->cdev_node);
1045 mutex_unlock(&cdev->lock);
1046 mutex_unlock(&tz->lock);
1050 mutex_unlock(&cdev->lock);
1051 mutex_unlock(&tz->lock);
1056 device_remove_file(&tz->device, &pos->attr);
1057 sysfs_remove_link(&tz->device.kobj, pos->name);
1058 release_idr(&tz->idr, &tz->lock, pos->id);
1062 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1064 static void thermal_release(struct device *dev)
1066 struct thermal_zone_device *tz;
1067 struct thermal_cooling_device *cdev;
1069 if (!strncmp(dev_name(dev), "thermal_zone",
1070 sizeof("thermal_zone") - 1)) {
1071 tz = to_thermal_zone(dev);
1073 } else if(!strncmp(dev_name(dev), "cooling_device",
1074 sizeof("cooling_device") - 1)){
1075 cdev = to_cooling_device(dev);
1080 static struct class thermal_class = {
1082 .dev_release = thermal_release,
1086 * __thermal_cooling_device_register() - register a new thermal cooling device
1087 * @np: a pointer to a device tree node.
1088 * @type: the thermal cooling device type.
1089 * @devdata: device private data.
1090 * @ops: standard thermal cooling devices callbacks.
1092 * This interface function adds a new thermal cooling device (fan/processor/...)
1093 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1094 * to all the thermal zone devices registered at the same time.
1095 * It also gives the opportunity to link the cooling device to a device tree
1096 * node, so that it can be bound to a thermal zone created out of device tree.
1098 * Return: a pointer to the created struct thermal_cooling_device or an
1099 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1101 static struct thermal_cooling_device *
1102 __thermal_cooling_device_register(struct device_node *np,
1103 char *type, void *devdata,
1104 const struct thermal_cooling_device_ops *ops)
1106 struct thermal_cooling_device *cdev;
1109 if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1110 return ERR_PTR(-EINVAL);
1112 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1113 !ops->set_cur_state)
1114 return ERR_PTR(-EINVAL);
1116 cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1118 return ERR_PTR(-ENOMEM);
1120 result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1123 return ERR_PTR(result);
1126 strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1127 mutex_init(&cdev->lock);
1128 INIT_LIST_HEAD(&cdev->thermal_instances);
1131 cdev->updated = false;
1132 cdev->device.class = &thermal_class;
1133 cdev->devdata = devdata;
1134 dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1135 result = device_register(&cdev->device);
1137 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1139 return ERR_PTR(result);
1144 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
1149 result = device_create_file(&cdev->device, &dev_attr_max_state);
1153 result = device_create_file(&cdev->device, &dev_attr_cur_state);
1157 /* Add 'this' new cdev to the global cdev list */
1158 mutex_lock(&thermal_list_lock);
1159 list_add(&cdev->node, &thermal_cdev_list);
1160 mutex_unlock(&thermal_list_lock);
1162 /* Update binding information for 'this' new cdev */
1168 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1169 device_unregister(&cdev->device);
1170 return ERR_PTR(result);
1174 * thermal_cooling_device_register() - register a new thermal cooling device
1175 * @type: the thermal cooling device type.
1176 * @devdata: device private data.
1177 * @ops: standard thermal cooling devices callbacks.
1179 * This interface function adds a new thermal cooling device (fan/processor/...)
1180 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1181 * to all the thermal zone devices registered at the same time.
1183 * Return: a pointer to the created struct thermal_cooling_device or an
1184 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1186 struct thermal_cooling_device *
1187 thermal_cooling_device_register(char *type, void *devdata,
1188 const struct thermal_cooling_device_ops *ops)
1190 return __thermal_cooling_device_register(NULL, type, devdata, ops);
1192 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1195 * thermal_of_cooling_device_register() - register an OF thermal cooling device
1196 * @np: a pointer to a device tree node.
1197 * @type: the thermal cooling device type.
1198 * @devdata: device private data.
1199 * @ops: standard thermal cooling devices callbacks.
1201 * This function will register a cooling device with device tree node reference.
1202 * This interface function adds a new thermal cooling device (fan/processor/...)
1203 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1204 * to all the thermal zone devices registered at the same time.
1206 * Return: a pointer to the created struct thermal_cooling_device or an
1207 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1209 struct thermal_cooling_device *
1210 thermal_of_cooling_device_register(struct device_node *np,
1211 char *type, void *devdata,
1212 const struct thermal_cooling_device_ops *ops)
1214 return __thermal_cooling_device_register(np, type, devdata, ops);
1216 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1219 * thermal_cooling_device_unregister - removes the registered thermal cooling device
1220 * @cdev: the thermal cooling device to remove.
1222 * thermal_cooling_device_unregister() must be called when the device is no
1225 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1228 const struct thermal_zone_params *tzp;
1229 struct thermal_zone_device *tz;
1230 struct thermal_cooling_device *pos = NULL;
1235 mutex_lock(&thermal_list_lock);
1236 list_for_each_entry(pos, &thermal_cdev_list, node)
1240 /* thermal cooling device not found */
1241 mutex_unlock(&thermal_list_lock);
1244 list_del(&cdev->node);
1246 /* Unbind all thermal zones associated with 'this' cdev */
1247 list_for_each_entry(tz, &thermal_tz_list, node) {
1248 if (tz->ops->unbind) {
1249 tz->ops->unbind(tz, cdev);
1253 if (!tz->tzp || !tz->tzp->tbp)
1257 for (i = 0; i < tzp->num_tbps; i++) {
1258 if (tzp->tbp[i].cdev == cdev) {
1259 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1260 tzp->tbp[i].cdev = NULL;
1265 mutex_unlock(&thermal_list_lock);
1268 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1269 device_remove_file(&cdev->device, &dev_attr_max_state);
1270 device_remove_file(&cdev->device, &dev_attr_cur_state);
1272 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1273 device_unregister(&cdev->device);
1276 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1278 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1280 struct thermal_instance *instance;
1281 unsigned long target = 0;
1283 /* cooling device is updated*/
1287 mutex_lock(&cdev->lock);
1288 /* Make sure cdev enters the deepest cooling state */
1289 list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1290 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1291 instance->tz->id, instance->target);
1292 if (instance->target == THERMAL_NO_TARGET)
1294 if (instance->target > target)
1295 target = instance->target;
1297 mutex_unlock(&cdev->lock);
1298 cdev->ops->set_cur_state(cdev, target);
1299 cdev->updated = true;
1300 trace_cdev_update(cdev, target);
1301 dev_dbg(&cdev->device, "set to state %lu\n", target);
1303 EXPORT_SYMBOL(thermal_cdev_update);
1306 * thermal_notify_framework - Sensor drivers use this API to notify framework
1307 * @tz: thermal zone device
1308 * @trip: indicates which trip point has been crossed
1310 * This function handles the trip events from sensor drivers. It starts
1311 * throttling the cooling devices according to the policy configured.
1312 * For CRITICAL and HOT trip points, this notifies the respective drivers,
1313 * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1314 * The throttling policy is based on the configured platform data; if no
1315 * platform data is provided, this uses the step_wise throttling policy.
1317 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1319 handle_thermal_trip(tz, trip);
1321 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1324 * create_trip_attrs() - create attributes for trip points
1325 * @tz: the thermal zone device
1326 * @mask: Writeable trip point bitmap.
1328 * helper function to instantiate sysfs entries for every trip
1329 * point and its properties of a struct thermal_zone_device.
1331 * Return: 0 on success, the proper error value otherwise.
1333 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1336 int size = sizeof(struct thermal_attr) * tz->trips;
1338 tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1339 if (!tz->trip_type_attrs)
1342 tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1343 if (!tz->trip_temp_attrs) {
1344 kfree(tz->trip_type_attrs);
1348 if (tz->ops->get_trip_hyst) {
1349 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1350 if (!tz->trip_hyst_attrs) {
1351 kfree(tz->trip_type_attrs);
1352 kfree(tz->trip_temp_attrs);
1358 for (indx = 0; indx < tz->trips; indx++) {
1359 /* create trip type attribute */
1360 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1361 "trip_point_%d_type", indx);
1363 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1364 tz->trip_type_attrs[indx].attr.attr.name =
1365 tz->trip_type_attrs[indx].name;
1366 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1367 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1369 device_create_file(&tz->device,
1370 &tz->trip_type_attrs[indx].attr);
1372 /* create trip temp attribute */
1373 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1374 "trip_point_%d_temp", indx);
1376 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1377 tz->trip_temp_attrs[indx].attr.attr.name =
1378 tz->trip_temp_attrs[indx].name;
1379 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1380 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1381 if (mask & (1 << indx)) {
1382 tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1383 tz->trip_temp_attrs[indx].attr.store =
1384 trip_point_temp_store;
1387 device_create_file(&tz->device,
1388 &tz->trip_temp_attrs[indx].attr);
1390 /* create Optional trip hyst attribute */
1391 if (!tz->ops->get_trip_hyst)
1393 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1394 "trip_point_%d_hyst", indx);
1396 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1397 tz->trip_hyst_attrs[indx].attr.attr.name =
1398 tz->trip_hyst_attrs[indx].name;
1399 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1400 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1401 if (tz->ops->set_trip_hyst) {
1402 tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1403 tz->trip_hyst_attrs[indx].attr.store =
1404 trip_point_hyst_store;
1407 device_create_file(&tz->device,
1408 &tz->trip_hyst_attrs[indx].attr);
1413 static void remove_trip_attrs(struct thermal_zone_device *tz)
1417 for (indx = 0; indx < tz->trips; indx++) {
1418 device_remove_file(&tz->device,
1419 &tz->trip_type_attrs[indx].attr);
1420 device_remove_file(&tz->device,
1421 &tz->trip_temp_attrs[indx].attr);
1422 if (tz->ops->get_trip_hyst)
1423 device_remove_file(&tz->device,
1424 &tz->trip_hyst_attrs[indx].attr);
1426 kfree(tz->trip_type_attrs);
1427 kfree(tz->trip_temp_attrs);
1428 kfree(tz->trip_hyst_attrs);
1432 * thermal_zone_device_register() - register a new thermal zone device
1433 * @type: the thermal zone device type
1434 * @trips: the number of trip points the thermal zone support
1435 * @mask: a bit string indicating the writeablility of trip points
1436 * @devdata: private device data
1437 * @ops: standard thermal zone device callbacks
1438 * @tzp: thermal zone platform parameters
1439 * @passive_delay: number of milliseconds to wait between polls when
1440 * performing passive cooling
1441 * @polling_delay: number of milliseconds to wait between polls when checking
1442 * whether trip points have been crossed (0 for interrupt
1445 * This interface function adds a new thermal zone device (sensor) to
1446 * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1447 * thermal cooling devices registered at the same time.
1448 * thermal_zone_device_unregister() must be called when the device is no
1449 * longer needed. The passive cooling depends on the .get_trend() return value.
1451 * Return: a pointer to the created struct thermal_zone_device or an
1452 * in case of error, an ERR_PTR. Caller must check return value with
1453 * IS_ERR*() helpers.
1455 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1456 int trips, int mask, void *devdata,
1457 struct thermal_zone_device_ops *ops,
1458 const struct thermal_zone_params *tzp,
1459 int passive_delay, int polling_delay)
1461 struct thermal_zone_device *tz;
1462 enum thermal_trip_type trip_type;
1467 if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1468 return ERR_PTR(-EINVAL);
1470 if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1471 return ERR_PTR(-EINVAL);
1474 return ERR_PTR(-EINVAL);
1476 if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1477 return ERR_PTR(-EINVAL);
1479 tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1481 return ERR_PTR(-ENOMEM);
1483 INIT_LIST_HEAD(&tz->thermal_instances);
1485 mutex_init(&tz->lock);
1486 result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1489 return ERR_PTR(result);
1492 strlcpy(tz->type, type ? : "", sizeof(tz->type));
1495 tz->device.class = &thermal_class;
1496 tz->devdata = devdata;
1498 tz->passive_delay = passive_delay;
1499 tz->polling_delay = polling_delay;
1501 dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1502 result = device_register(&tz->device);
1504 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1506 return ERR_PTR(result);
1511 result = device_create_file(&tz->device, &dev_attr_type);
1516 result = device_create_file(&tz->device, &dev_attr_temp);
1520 if (ops->get_mode) {
1521 result = device_create_file(&tz->device, &dev_attr_mode);
1526 result = create_trip_attrs(tz, mask);
1530 for (count = 0; count < trips; count++) {
1531 tz->ops->get_trip_type(tz, count, &trip_type);
1532 if (trip_type == THERMAL_TRIP_PASSIVE)
1537 result = device_create_file(&tz->device, &dev_attr_passive);
1542 #ifdef CONFIG_THERMAL_EMULATION
1543 result = device_create_file(&tz->device, &dev_attr_emul_temp);
1547 /* Create policy attribute */
1548 result = device_create_file(&tz->device, &dev_attr_policy);
1552 /* Update 'this' zone's governor information */
1553 mutex_lock(&thermal_governor_lock);
1556 tz->governor = __find_governor(tz->tzp->governor_name);
1558 tz->governor = def_governor;
1560 mutex_unlock(&thermal_governor_lock);
1562 if (!tz->tzp || !tz->tzp->no_hwmon) {
1563 result = thermal_add_hwmon_sysfs(tz);
1568 mutex_lock(&thermal_list_lock);
1569 list_add_tail(&tz->node, &thermal_tz_list);
1570 mutex_unlock(&thermal_list_lock);
1572 /* Bind cooling devices for this zone */
1575 INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1577 if (!tz->ops->get_temp)
1578 thermal_zone_device_set_polling(tz, 0);
1580 thermal_zone_device_update(tz);
1585 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1586 device_unregister(&tz->device);
1587 return ERR_PTR(result);
1589 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1592 * thermal_device_unregister - removes the registered thermal zone device
1593 * @tz: the thermal zone device to remove
1595 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1598 const struct thermal_zone_params *tzp;
1599 struct thermal_cooling_device *cdev;
1600 struct thermal_zone_device *pos = NULL;
1607 mutex_lock(&thermal_list_lock);
1608 list_for_each_entry(pos, &thermal_tz_list, node)
1612 /* thermal zone device not found */
1613 mutex_unlock(&thermal_list_lock);
1616 list_del(&tz->node);
1618 /* Unbind all cdevs associated with 'this' thermal zone */
1619 list_for_each_entry(cdev, &thermal_cdev_list, node) {
1620 if (tz->ops->unbind) {
1621 tz->ops->unbind(tz, cdev);
1625 if (!tzp || !tzp->tbp)
1628 for (i = 0; i < tzp->num_tbps; i++) {
1629 if (tzp->tbp[i].cdev == cdev) {
1630 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1631 tzp->tbp[i].cdev = NULL;
1636 mutex_unlock(&thermal_list_lock);
1638 thermal_zone_device_set_polling(tz, 0);
1641 device_remove_file(&tz->device, &dev_attr_type);
1642 device_remove_file(&tz->device, &dev_attr_temp);
1643 if (tz->ops->get_mode)
1644 device_remove_file(&tz->device, &dev_attr_mode);
1645 device_remove_file(&tz->device, &dev_attr_policy);
1646 remove_trip_attrs(tz);
1647 tz->governor = NULL;
1649 thermal_remove_hwmon_sysfs(tz);
1650 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1651 idr_destroy(&tz->idr);
1652 mutex_destroy(&tz->lock);
1653 device_unregister(&tz->device);
1656 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
1659 * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1660 * @name: thermal zone name to fetch the temperature
1662 * When only one zone is found with the passed name, returns a reference to it.
1664 * Return: On success returns a reference to an unique thermal zone with
1665 * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1666 * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1668 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1670 struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1671 unsigned int found = 0;
1676 mutex_lock(&thermal_list_lock);
1677 list_for_each_entry(pos, &thermal_tz_list, node)
1678 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
1682 mutex_unlock(&thermal_list_lock);
1684 /* nothing has been found, thus an error code for it */
1686 ref = ERR_PTR(-ENODEV);
1688 /* Success only when an unique zone is found */
1689 ref = ERR_PTR(-EEXIST);
1694 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
1697 static const struct genl_multicast_group thermal_event_mcgrps[] = {
1698 { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
1701 static struct genl_family thermal_event_genl_family = {
1702 .id = GENL_ID_GENERATE,
1703 .name = THERMAL_GENL_FAMILY_NAME,
1704 .version = THERMAL_GENL_VERSION,
1705 .maxattr = THERMAL_GENL_ATTR_MAX,
1706 .mcgrps = thermal_event_mcgrps,
1707 .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
1710 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
1713 struct sk_buff *skb;
1714 struct nlattr *attr;
1715 struct thermal_genl_event *thermal_event;
1719 static unsigned int thermal_event_seqnum;
1724 /* allocate memory */
1725 size = nla_total_size(sizeof(struct thermal_genl_event)) +
1728 skb = genlmsg_new(size, GFP_ATOMIC);
1732 /* add the genetlink message header */
1733 msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1734 &thermal_event_genl_family, 0,
1735 THERMAL_GENL_CMD_EVENT);
1742 attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1743 sizeof(struct thermal_genl_event));
1750 thermal_event = nla_data(attr);
1751 if (!thermal_event) {
1756 memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1758 thermal_event->orig = tz->id;
1759 thermal_event->event = event;
1761 /* send multicast genetlink message */
1762 genlmsg_end(skb, msg_header);
1764 result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
1767 dev_err(&tz->device, "Failed to send netlink event:%d", result);
1771 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
1773 static int genetlink_init(void)
1775 return genl_register_family(&thermal_event_genl_family);
1778 static void genetlink_exit(void)
1780 genl_unregister_family(&thermal_event_genl_family);
1782 #else /* !CONFIG_NET */
1783 static inline int genetlink_init(void) { return 0; }
1784 static inline void genetlink_exit(void) {}
1785 #endif /* !CONFIG_NET */
1787 static int __init thermal_register_governors(void)
1791 result = thermal_gov_step_wise_register();
1795 result = thermal_gov_fair_share_register();
1799 result = thermal_gov_bang_bang_register();
1803 return thermal_gov_user_space_register();
1806 static void thermal_unregister_governors(void)
1808 thermal_gov_step_wise_unregister();
1809 thermal_gov_fair_share_unregister();
1810 thermal_gov_bang_bang_unregister();
1811 thermal_gov_user_space_unregister();
1814 static int __init thermal_init(void)
1818 result = thermal_register_governors();
1822 result = class_register(&thermal_class);
1824 goto unregister_governors;
1826 result = genetlink_init();
1828 goto unregister_class;
1830 result = of_parse_thermal_zones();
1839 class_unregister(&thermal_class);
1840 unregister_governors:
1841 thermal_unregister_governors();
1843 idr_destroy(&thermal_tz_idr);
1844 idr_destroy(&thermal_cdev_idr);
1845 mutex_destroy(&thermal_idr_lock);
1846 mutex_destroy(&thermal_list_lock);
1847 mutex_destroy(&thermal_governor_lock);
1851 static void __exit thermal_exit(void)
1853 of_thermal_destroy_zones();
1855 class_unregister(&thermal_class);
1856 thermal_unregister_governors();
1857 idr_destroy(&thermal_tz_idr);
1858 idr_destroy(&thermal_cdev_idr);
1859 mutex_destroy(&thermal_idr_lock);
1860 mutex_destroy(&thermal_list_lock);
1861 mutex_destroy(&thermal_governor_lock);
1864 fs_initcall(thermal_init);
1865 module_exit(thermal_exit);