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);
462 dev_warn(&tz->device,
463 "failed to read out thermal zone (%d)\n",
468 mutex_lock(&tz->lock);
469 tz->last_temperature = tz->temperature;
470 tz->temperature = temp;
471 mutex_unlock(&tz->lock);
473 trace_thermal_temperature(tz);
474 dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
475 tz->last_temperature, tz->temperature);
478 void thermal_zone_device_update(struct thermal_zone_device *tz)
482 if (!tz->ops->get_temp)
485 update_temperature(tz);
487 for (count = 0; count < tz->trips; count++)
488 handle_thermal_trip(tz, count);
490 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
492 static void thermal_zone_device_check(struct work_struct *work)
494 struct thermal_zone_device *tz = container_of(work, struct
497 thermal_zone_device_update(tz);
500 /* sys I/F for thermal zone */
502 #define to_thermal_zone(_dev) \
503 container_of(_dev, struct thermal_zone_device, device)
506 type_show(struct device *dev, struct device_attribute *attr, char *buf)
508 struct thermal_zone_device *tz = to_thermal_zone(dev);
510 return sprintf(buf, "%s\n", tz->type);
514 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
516 struct thermal_zone_device *tz = to_thermal_zone(dev);
520 ret = thermal_zone_get_temp(tz, &temperature);
525 return sprintf(buf, "%ld\n", temperature);
529 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
531 struct thermal_zone_device *tz = to_thermal_zone(dev);
532 enum thermal_device_mode mode;
535 if (!tz->ops->get_mode)
538 result = tz->ops->get_mode(tz, &mode);
542 return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
547 mode_store(struct device *dev, struct device_attribute *attr,
548 const char *buf, size_t count)
550 struct thermal_zone_device *tz = to_thermal_zone(dev);
553 if (!tz->ops->set_mode)
556 if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
557 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
558 else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
559 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
570 trip_point_type_show(struct device *dev, struct device_attribute *attr,
573 struct thermal_zone_device *tz = to_thermal_zone(dev);
574 enum thermal_trip_type type;
577 if (!tz->ops->get_trip_type)
580 if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
583 result = tz->ops->get_trip_type(tz, trip, &type);
588 case THERMAL_TRIP_CRITICAL:
589 return sprintf(buf, "critical\n");
590 case THERMAL_TRIP_HOT:
591 return sprintf(buf, "hot\n");
592 case THERMAL_TRIP_PASSIVE:
593 return sprintf(buf, "passive\n");
594 case THERMAL_TRIP_ACTIVE:
595 return sprintf(buf, "active\n");
597 return sprintf(buf, "unknown\n");
602 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
603 const char *buf, size_t count)
605 struct thermal_zone_device *tz = to_thermal_zone(dev);
607 unsigned long temperature;
609 if (!tz->ops->set_trip_temp)
612 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
615 if (kstrtoul(buf, 10, &temperature))
618 ret = tz->ops->set_trip_temp(tz, trip, temperature);
620 return ret ? ret : count;
624 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
627 struct thermal_zone_device *tz = to_thermal_zone(dev);
631 if (!tz->ops->get_trip_temp)
634 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
637 ret = tz->ops->get_trip_temp(tz, trip, &temperature);
642 return sprintf(buf, "%ld\n", temperature);
646 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
647 const char *buf, size_t count)
649 struct thermal_zone_device *tz = to_thermal_zone(dev);
651 unsigned long temperature;
653 if (!tz->ops->set_trip_hyst)
656 if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
659 if (kstrtoul(buf, 10, &temperature))
663 * We are not doing any check on the 'temperature' value
664 * here. The driver implementing 'set_trip_hyst' has to
667 ret = tz->ops->set_trip_hyst(tz, trip, temperature);
669 return ret ? ret : count;
673 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
676 struct thermal_zone_device *tz = to_thermal_zone(dev);
678 unsigned long temperature;
680 if (!tz->ops->get_trip_hyst)
683 if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
686 ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
688 return ret ? ret : sprintf(buf, "%ld\n", temperature);
692 passive_store(struct device *dev, struct device_attribute *attr,
693 const char *buf, size_t count)
695 struct thermal_zone_device *tz = to_thermal_zone(dev);
696 struct thermal_cooling_device *cdev = NULL;
699 if (!sscanf(buf, "%d\n", &state))
702 /* sanity check: values below 1000 millicelcius don't make sense
703 * and can cause the system to go into a thermal heart attack
705 if (state && state < 1000)
708 if (state && !tz->forced_passive) {
709 mutex_lock(&thermal_list_lock);
710 list_for_each_entry(cdev, &thermal_cdev_list, node) {
711 if (!strncmp("Processor", cdev->type,
712 sizeof("Processor")))
713 thermal_zone_bind_cooling_device(tz,
714 THERMAL_TRIPS_NONE, cdev,
718 mutex_unlock(&thermal_list_lock);
719 if (!tz->passive_delay)
720 tz->passive_delay = 1000;
721 } else if (!state && tz->forced_passive) {
722 mutex_lock(&thermal_list_lock);
723 list_for_each_entry(cdev, &thermal_cdev_list, node) {
724 if (!strncmp("Processor", cdev->type,
725 sizeof("Processor")))
726 thermal_zone_unbind_cooling_device(tz,
730 mutex_unlock(&thermal_list_lock);
731 tz->passive_delay = 0;
734 tz->forced_passive = state;
736 thermal_zone_device_update(tz);
742 passive_show(struct device *dev, struct device_attribute *attr,
745 struct thermal_zone_device *tz = to_thermal_zone(dev);
747 return sprintf(buf, "%d\n", tz->forced_passive);
751 policy_store(struct device *dev, struct device_attribute *attr,
752 const char *buf, size_t count)
755 struct thermal_zone_device *tz = to_thermal_zone(dev);
756 struct thermal_governor *gov;
757 char name[THERMAL_NAME_LENGTH];
759 snprintf(name, sizeof(name), "%s", buf);
761 mutex_lock(&thermal_governor_lock);
762 mutex_lock(&tz->lock);
764 gov = __find_governor(strim(name));
772 mutex_unlock(&tz->lock);
773 mutex_unlock(&thermal_governor_lock);
778 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
780 struct thermal_zone_device *tz = to_thermal_zone(dev);
782 return sprintf(buf, "%s\n", tz->governor->name);
785 #ifdef CONFIG_THERMAL_EMULATION
787 emul_temp_store(struct device *dev, struct device_attribute *attr,
788 const char *buf, size_t count)
790 struct thermal_zone_device *tz = to_thermal_zone(dev);
792 unsigned long temperature;
794 if (kstrtoul(buf, 10, &temperature))
797 if (!tz->ops->set_emul_temp) {
798 mutex_lock(&tz->lock);
799 tz->emul_temperature = temperature;
800 mutex_unlock(&tz->lock);
802 ret = tz->ops->set_emul_temp(tz, temperature);
806 thermal_zone_device_update(tz);
808 return ret ? ret : count;
810 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
811 #endif/*CONFIG_THERMAL_EMULATION*/
813 static DEVICE_ATTR(type, 0444, type_show, NULL);
814 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
815 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
816 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
817 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
819 /* sys I/F for cooling device */
820 #define to_cooling_device(_dev) \
821 container_of(_dev, struct thermal_cooling_device, device)
824 thermal_cooling_device_type_show(struct device *dev,
825 struct device_attribute *attr, char *buf)
827 struct thermal_cooling_device *cdev = to_cooling_device(dev);
829 return sprintf(buf, "%s\n", cdev->type);
833 thermal_cooling_device_max_state_show(struct device *dev,
834 struct device_attribute *attr, char *buf)
836 struct thermal_cooling_device *cdev = to_cooling_device(dev);
840 ret = cdev->ops->get_max_state(cdev, &state);
843 return sprintf(buf, "%ld\n", state);
847 thermal_cooling_device_cur_state_show(struct device *dev,
848 struct device_attribute *attr, char *buf)
850 struct thermal_cooling_device *cdev = to_cooling_device(dev);
854 ret = cdev->ops->get_cur_state(cdev, &state);
857 return sprintf(buf, "%ld\n", state);
861 thermal_cooling_device_cur_state_store(struct device *dev,
862 struct device_attribute *attr,
863 const char *buf, size_t count)
865 struct thermal_cooling_device *cdev = to_cooling_device(dev);
869 if (!sscanf(buf, "%ld\n", &state))
875 result = cdev->ops->set_cur_state(cdev, state);
881 static struct device_attribute dev_attr_cdev_type =
882 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
883 static DEVICE_ATTR(max_state, 0444,
884 thermal_cooling_device_max_state_show, NULL);
885 static DEVICE_ATTR(cur_state, 0644,
886 thermal_cooling_device_cur_state_show,
887 thermal_cooling_device_cur_state_store);
890 thermal_cooling_device_trip_point_show(struct device *dev,
891 struct device_attribute *attr, char *buf)
893 struct thermal_instance *instance;
896 container_of(attr, struct thermal_instance, attr);
898 if (instance->trip == THERMAL_TRIPS_NONE)
899 return sprintf(buf, "-1\n");
901 return sprintf(buf, "%d\n", instance->trip);
904 static struct attribute *cooling_device_attrs[] = {
905 &dev_attr_cdev_type.attr,
906 &dev_attr_max_state.attr,
907 &dev_attr_cur_state.attr,
911 static const struct attribute_group cooling_device_attr_group = {
912 .attrs = cooling_device_attrs,
915 static const struct attribute_group *cooling_device_attr_groups[] = {
916 &cooling_device_attr_group,
920 /* Device management */
923 * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
924 * @tz: pointer to struct thermal_zone_device
925 * @trip: indicates which trip point the cooling devices is
926 * associated with in this thermal zone.
927 * @cdev: pointer to struct thermal_cooling_device
928 * @upper: the Maximum cooling state for this trip point.
929 * THERMAL_NO_LIMIT means no upper limit,
930 * and the cooling device can be in max_state.
931 * @lower: the Minimum cooling state can be used for this trip point.
932 * THERMAL_NO_LIMIT means no lower limit,
933 * and the cooling device can be in cooling state 0.
935 * This interface function bind a thermal cooling device to the certain trip
936 * point of a thermal zone device.
937 * This function is usually called in the thermal zone device .bind callback.
939 * Return: 0 on success, the proper error value otherwise.
941 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
943 struct thermal_cooling_device *cdev,
944 unsigned long upper, unsigned long lower)
946 struct thermal_instance *dev;
947 struct thermal_instance *pos;
948 struct thermal_zone_device *pos1;
949 struct thermal_cooling_device *pos2;
950 unsigned long max_state;
953 if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
956 list_for_each_entry(pos1, &thermal_tz_list, node) {
960 list_for_each_entry(pos2, &thermal_cdev_list, node) {
965 if (tz != pos1 || cdev != pos2)
968 ret = cdev->ops->get_max_state(cdev, &max_state);
972 /* lower default 0, upper default max_state */
973 lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
974 upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
976 if (lower > upper || upper > max_state)
980 kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
988 dev->target = THERMAL_NO_TARGET;
990 result = get_idr(&tz->idr, &tz->lock, &dev->id);
994 sprintf(dev->name, "cdev%d", dev->id);
996 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1000 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1001 sysfs_attr_init(&dev->attr.attr);
1002 dev->attr.attr.name = dev->attr_name;
1003 dev->attr.attr.mode = 0444;
1004 dev->attr.show = thermal_cooling_device_trip_point_show;
1005 result = device_create_file(&tz->device, &dev->attr);
1007 goto remove_symbol_link;
1009 mutex_lock(&tz->lock);
1010 mutex_lock(&cdev->lock);
1011 list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1012 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1017 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1018 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1020 mutex_unlock(&cdev->lock);
1021 mutex_unlock(&tz->lock);
1026 device_remove_file(&tz->device, &dev->attr);
1028 sysfs_remove_link(&tz->device.kobj, dev->name);
1030 release_idr(&tz->idr, &tz->lock, dev->id);
1035 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1038 * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1040 * @tz: pointer to a struct thermal_zone_device.
1041 * @trip: indicates which trip point the cooling devices is
1042 * associated with in this thermal zone.
1043 * @cdev: pointer to a struct thermal_cooling_device.
1045 * This interface function unbind a thermal cooling device from the certain
1046 * trip point of a thermal zone device.
1047 * This function is usually called in the thermal zone device .unbind callback.
1049 * Return: 0 on success, the proper error value otherwise.
1051 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1053 struct thermal_cooling_device *cdev)
1055 struct thermal_instance *pos, *next;
1057 mutex_lock(&tz->lock);
1058 mutex_lock(&cdev->lock);
1059 list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1060 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1061 list_del(&pos->tz_node);
1062 list_del(&pos->cdev_node);
1063 mutex_unlock(&cdev->lock);
1064 mutex_unlock(&tz->lock);
1068 mutex_unlock(&cdev->lock);
1069 mutex_unlock(&tz->lock);
1074 device_remove_file(&tz->device, &pos->attr);
1075 sysfs_remove_link(&tz->device.kobj, pos->name);
1076 release_idr(&tz->idr, &tz->lock, pos->id);
1080 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1082 static void thermal_release(struct device *dev)
1084 struct thermal_zone_device *tz;
1085 struct thermal_cooling_device *cdev;
1087 if (!strncmp(dev_name(dev), "thermal_zone",
1088 sizeof("thermal_zone") - 1)) {
1089 tz = to_thermal_zone(dev);
1091 } else if(!strncmp(dev_name(dev), "cooling_device",
1092 sizeof("cooling_device") - 1)){
1093 cdev = to_cooling_device(dev);
1098 static struct class thermal_class = {
1100 .dev_release = thermal_release,
1104 * __thermal_cooling_device_register() - register a new thermal cooling device
1105 * @np: a pointer to a device tree node.
1106 * @type: the thermal cooling device type.
1107 * @devdata: device private data.
1108 * @ops: standard thermal cooling devices callbacks.
1110 * This interface function adds a new thermal cooling device (fan/processor/...)
1111 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1112 * to all the thermal zone devices registered at the same time.
1113 * It also gives the opportunity to link the cooling device to a device tree
1114 * node, so that it can be bound to a thermal zone created out of device tree.
1116 * Return: a pointer to the created struct thermal_cooling_device or an
1117 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1119 static struct thermal_cooling_device *
1120 __thermal_cooling_device_register(struct device_node *np,
1121 char *type, void *devdata,
1122 const struct thermal_cooling_device_ops *ops)
1124 struct thermal_cooling_device *cdev;
1127 if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1128 return ERR_PTR(-EINVAL);
1130 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1131 !ops->set_cur_state)
1132 return ERR_PTR(-EINVAL);
1134 cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1136 return ERR_PTR(-ENOMEM);
1138 result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1141 return ERR_PTR(result);
1144 strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1145 mutex_init(&cdev->lock);
1146 INIT_LIST_HEAD(&cdev->thermal_instances);
1149 cdev->updated = false;
1150 cdev->device.class = &thermal_class;
1151 cdev->device.groups = cooling_device_attr_groups;
1152 cdev->devdata = devdata;
1153 dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1154 result = device_register(&cdev->device);
1156 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1158 return ERR_PTR(result);
1161 /* Add 'this' new cdev to the global cdev list */
1162 mutex_lock(&thermal_list_lock);
1163 list_add(&cdev->node, &thermal_cdev_list);
1164 mutex_unlock(&thermal_list_lock);
1166 /* Update binding information for 'this' new cdev */
1173 * thermal_cooling_device_register() - register a new thermal cooling device
1174 * @type: the thermal cooling device type.
1175 * @devdata: device private data.
1176 * @ops: standard thermal cooling devices callbacks.
1178 * This interface function adds a new thermal cooling device (fan/processor/...)
1179 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1180 * to all the thermal zone devices registered at the same time.
1182 * Return: a pointer to the created struct thermal_cooling_device or an
1183 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1185 struct thermal_cooling_device *
1186 thermal_cooling_device_register(char *type, void *devdata,
1187 const struct thermal_cooling_device_ops *ops)
1189 return __thermal_cooling_device_register(NULL, type, devdata, ops);
1191 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1194 * thermal_of_cooling_device_register() - register an OF thermal cooling device
1195 * @np: a pointer to a device tree node.
1196 * @type: the thermal cooling device type.
1197 * @devdata: device private data.
1198 * @ops: standard thermal cooling devices callbacks.
1200 * This function will register a cooling device with device tree node reference.
1201 * This interface function adds a new thermal cooling device (fan/processor/...)
1202 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1203 * to all the thermal zone devices registered at the same time.
1205 * Return: a pointer to the created struct thermal_cooling_device or an
1206 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1208 struct thermal_cooling_device *
1209 thermal_of_cooling_device_register(struct device_node *np,
1210 char *type, void *devdata,
1211 const struct thermal_cooling_device_ops *ops)
1213 return __thermal_cooling_device_register(np, type, devdata, ops);
1215 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1218 * thermal_cooling_device_unregister - removes the registered thermal cooling device
1219 * @cdev: the thermal cooling device to remove.
1221 * thermal_cooling_device_unregister() must be called when the device is no
1224 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1227 const struct thermal_zone_params *tzp;
1228 struct thermal_zone_device *tz;
1229 struct thermal_cooling_device *pos = NULL;
1234 mutex_lock(&thermal_list_lock);
1235 list_for_each_entry(pos, &thermal_cdev_list, node)
1239 /* thermal cooling device not found */
1240 mutex_unlock(&thermal_list_lock);
1243 list_del(&cdev->node);
1245 /* Unbind all thermal zones associated with 'this' cdev */
1246 list_for_each_entry(tz, &thermal_tz_list, node) {
1247 if (tz->ops->unbind) {
1248 tz->ops->unbind(tz, cdev);
1252 if (!tz->tzp || !tz->tzp->tbp)
1256 for (i = 0; i < tzp->num_tbps; i++) {
1257 if (tzp->tbp[i].cdev == cdev) {
1258 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1259 tzp->tbp[i].cdev = NULL;
1264 mutex_unlock(&thermal_list_lock);
1267 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1268 device_remove_file(&cdev->device, &dev_attr_max_state);
1269 device_remove_file(&cdev->device, &dev_attr_cur_state);
1271 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1272 device_unregister(&cdev->device);
1275 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1277 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1279 struct thermal_instance *instance;
1280 unsigned long target = 0;
1282 /* cooling device is updated*/
1286 mutex_lock(&cdev->lock);
1287 /* Make sure cdev enters the deepest cooling state */
1288 list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1289 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1290 instance->tz->id, instance->target);
1291 if (instance->target == THERMAL_NO_TARGET)
1293 if (instance->target > target)
1294 target = instance->target;
1296 mutex_unlock(&cdev->lock);
1297 cdev->ops->set_cur_state(cdev, target);
1298 cdev->updated = true;
1299 trace_cdev_update(cdev, target);
1300 dev_dbg(&cdev->device, "set to state %lu\n", target);
1302 EXPORT_SYMBOL(thermal_cdev_update);
1305 * thermal_notify_framework - Sensor drivers use this API to notify framework
1306 * @tz: thermal zone device
1307 * @trip: indicates which trip point has been crossed
1309 * This function handles the trip events from sensor drivers. It starts
1310 * throttling the cooling devices according to the policy configured.
1311 * For CRITICAL and HOT trip points, this notifies the respective drivers,
1312 * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1313 * The throttling policy is based on the configured platform data; if no
1314 * platform data is provided, this uses the step_wise throttling policy.
1316 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1318 handle_thermal_trip(tz, trip);
1320 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1323 * create_trip_attrs() - create attributes for trip points
1324 * @tz: the thermal zone device
1325 * @mask: Writeable trip point bitmap.
1327 * helper function to instantiate sysfs entries for every trip
1328 * point and its properties of a struct thermal_zone_device.
1330 * Return: 0 on success, the proper error value otherwise.
1332 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1335 int size = sizeof(struct thermal_attr) * tz->trips;
1337 tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1338 if (!tz->trip_type_attrs)
1341 tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1342 if (!tz->trip_temp_attrs) {
1343 kfree(tz->trip_type_attrs);
1347 if (tz->ops->get_trip_hyst) {
1348 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1349 if (!tz->trip_hyst_attrs) {
1350 kfree(tz->trip_type_attrs);
1351 kfree(tz->trip_temp_attrs);
1357 for (indx = 0; indx < tz->trips; indx++) {
1358 /* create trip type attribute */
1359 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1360 "trip_point_%d_type", indx);
1362 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1363 tz->trip_type_attrs[indx].attr.attr.name =
1364 tz->trip_type_attrs[indx].name;
1365 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1366 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1368 device_create_file(&tz->device,
1369 &tz->trip_type_attrs[indx].attr);
1371 /* create trip temp attribute */
1372 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1373 "trip_point_%d_temp", indx);
1375 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1376 tz->trip_temp_attrs[indx].attr.attr.name =
1377 tz->trip_temp_attrs[indx].name;
1378 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1379 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1380 if (mask & (1 << indx)) {
1381 tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1382 tz->trip_temp_attrs[indx].attr.store =
1383 trip_point_temp_store;
1386 device_create_file(&tz->device,
1387 &tz->trip_temp_attrs[indx].attr);
1389 /* create Optional trip hyst attribute */
1390 if (!tz->ops->get_trip_hyst)
1392 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1393 "trip_point_%d_hyst", indx);
1395 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1396 tz->trip_hyst_attrs[indx].attr.attr.name =
1397 tz->trip_hyst_attrs[indx].name;
1398 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1399 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1400 if (tz->ops->set_trip_hyst) {
1401 tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1402 tz->trip_hyst_attrs[indx].attr.store =
1403 trip_point_hyst_store;
1406 device_create_file(&tz->device,
1407 &tz->trip_hyst_attrs[indx].attr);
1412 static void remove_trip_attrs(struct thermal_zone_device *tz)
1416 for (indx = 0; indx < tz->trips; indx++) {
1417 device_remove_file(&tz->device,
1418 &tz->trip_type_attrs[indx].attr);
1419 device_remove_file(&tz->device,
1420 &tz->trip_temp_attrs[indx].attr);
1421 if (tz->ops->get_trip_hyst)
1422 device_remove_file(&tz->device,
1423 &tz->trip_hyst_attrs[indx].attr);
1425 kfree(tz->trip_type_attrs);
1426 kfree(tz->trip_temp_attrs);
1427 kfree(tz->trip_hyst_attrs);
1431 * thermal_zone_device_register() - register a new thermal zone device
1432 * @type: the thermal zone device type
1433 * @trips: the number of trip points the thermal zone support
1434 * @mask: a bit string indicating the writeablility of trip points
1435 * @devdata: private device data
1436 * @ops: standard thermal zone device callbacks
1437 * @tzp: thermal zone platform parameters
1438 * @passive_delay: number of milliseconds to wait between polls when
1439 * performing passive cooling
1440 * @polling_delay: number of milliseconds to wait between polls when checking
1441 * whether trip points have been crossed (0 for interrupt
1444 * This interface function adds a new thermal zone device (sensor) to
1445 * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1446 * thermal cooling devices registered at the same time.
1447 * thermal_zone_device_unregister() must be called when the device is no
1448 * longer needed. The passive cooling depends on the .get_trend() return value.
1450 * Return: a pointer to the created struct thermal_zone_device or an
1451 * in case of error, an ERR_PTR. Caller must check return value with
1452 * IS_ERR*() helpers.
1454 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1455 int trips, int mask, void *devdata,
1456 struct thermal_zone_device_ops *ops,
1457 const struct thermal_zone_params *tzp,
1458 int passive_delay, int polling_delay)
1460 struct thermal_zone_device *tz;
1461 enum thermal_trip_type trip_type;
1466 if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1467 return ERR_PTR(-EINVAL);
1469 if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1470 return ERR_PTR(-EINVAL);
1473 return ERR_PTR(-EINVAL);
1475 if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1476 return ERR_PTR(-EINVAL);
1478 tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1480 return ERR_PTR(-ENOMEM);
1482 INIT_LIST_HEAD(&tz->thermal_instances);
1484 mutex_init(&tz->lock);
1485 result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1488 return ERR_PTR(result);
1491 strlcpy(tz->type, type ? : "", sizeof(tz->type));
1494 tz->device.class = &thermal_class;
1495 tz->devdata = devdata;
1497 tz->passive_delay = passive_delay;
1498 tz->polling_delay = polling_delay;
1500 dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1501 result = device_register(&tz->device);
1503 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1505 return ERR_PTR(result);
1510 result = device_create_file(&tz->device, &dev_attr_type);
1515 result = device_create_file(&tz->device, &dev_attr_temp);
1519 if (ops->get_mode) {
1520 result = device_create_file(&tz->device, &dev_attr_mode);
1525 result = create_trip_attrs(tz, mask);
1529 for (count = 0; count < trips; count++) {
1530 tz->ops->get_trip_type(tz, count, &trip_type);
1531 if (trip_type == THERMAL_TRIP_PASSIVE)
1536 result = device_create_file(&tz->device, &dev_attr_passive);
1541 #ifdef CONFIG_THERMAL_EMULATION
1542 result = device_create_file(&tz->device, &dev_attr_emul_temp);
1546 /* Create policy attribute */
1547 result = device_create_file(&tz->device, &dev_attr_policy);
1551 /* Update 'this' zone's governor information */
1552 mutex_lock(&thermal_governor_lock);
1555 tz->governor = __find_governor(tz->tzp->governor_name);
1557 tz->governor = def_governor;
1559 mutex_unlock(&thermal_governor_lock);
1561 if (!tz->tzp || !tz->tzp->no_hwmon) {
1562 result = thermal_add_hwmon_sysfs(tz);
1567 mutex_lock(&thermal_list_lock);
1568 list_add_tail(&tz->node, &thermal_tz_list);
1569 mutex_unlock(&thermal_list_lock);
1571 /* Bind cooling devices for this zone */
1574 INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1576 if (!tz->ops->get_temp)
1577 thermal_zone_device_set_polling(tz, 0);
1579 thermal_zone_device_update(tz);
1584 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1585 device_unregister(&tz->device);
1586 return ERR_PTR(result);
1588 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1591 * thermal_device_unregister - removes the registered thermal zone device
1592 * @tz: the thermal zone device to remove
1594 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1597 const struct thermal_zone_params *tzp;
1598 struct thermal_cooling_device *cdev;
1599 struct thermal_zone_device *pos = NULL;
1606 mutex_lock(&thermal_list_lock);
1607 list_for_each_entry(pos, &thermal_tz_list, node)
1611 /* thermal zone device not found */
1612 mutex_unlock(&thermal_list_lock);
1615 list_del(&tz->node);
1617 /* Unbind all cdevs associated with 'this' thermal zone */
1618 list_for_each_entry(cdev, &thermal_cdev_list, node) {
1619 if (tz->ops->unbind) {
1620 tz->ops->unbind(tz, cdev);
1624 if (!tzp || !tzp->tbp)
1627 for (i = 0; i < tzp->num_tbps; i++) {
1628 if (tzp->tbp[i].cdev == cdev) {
1629 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1630 tzp->tbp[i].cdev = NULL;
1635 mutex_unlock(&thermal_list_lock);
1637 thermal_zone_device_set_polling(tz, 0);
1640 device_remove_file(&tz->device, &dev_attr_type);
1641 device_remove_file(&tz->device, &dev_attr_temp);
1642 if (tz->ops->get_mode)
1643 device_remove_file(&tz->device, &dev_attr_mode);
1644 device_remove_file(&tz->device, &dev_attr_policy);
1645 remove_trip_attrs(tz);
1646 tz->governor = NULL;
1648 thermal_remove_hwmon_sysfs(tz);
1649 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1650 idr_destroy(&tz->idr);
1651 mutex_destroy(&tz->lock);
1652 device_unregister(&tz->device);
1655 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
1658 * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1659 * @name: thermal zone name to fetch the temperature
1661 * When only one zone is found with the passed name, returns a reference to it.
1663 * Return: On success returns a reference to an unique thermal zone with
1664 * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1665 * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1667 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1669 struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1670 unsigned int found = 0;
1675 mutex_lock(&thermal_list_lock);
1676 list_for_each_entry(pos, &thermal_tz_list, node)
1677 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
1681 mutex_unlock(&thermal_list_lock);
1683 /* nothing has been found, thus an error code for it */
1685 ref = ERR_PTR(-ENODEV);
1687 /* Success only when an unique zone is found */
1688 ref = ERR_PTR(-EEXIST);
1693 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
1696 static const struct genl_multicast_group thermal_event_mcgrps[] = {
1697 { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
1700 static struct genl_family thermal_event_genl_family = {
1701 .id = GENL_ID_GENERATE,
1702 .name = THERMAL_GENL_FAMILY_NAME,
1703 .version = THERMAL_GENL_VERSION,
1704 .maxattr = THERMAL_GENL_ATTR_MAX,
1705 .mcgrps = thermal_event_mcgrps,
1706 .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
1709 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
1712 struct sk_buff *skb;
1713 struct nlattr *attr;
1714 struct thermal_genl_event *thermal_event;
1718 static unsigned int thermal_event_seqnum;
1723 /* allocate memory */
1724 size = nla_total_size(sizeof(struct thermal_genl_event)) +
1727 skb = genlmsg_new(size, GFP_ATOMIC);
1731 /* add the genetlink message header */
1732 msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1733 &thermal_event_genl_family, 0,
1734 THERMAL_GENL_CMD_EVENT);
1741 attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1742 sizeof(struct thermal_genl_event));
1749 thermal_event = nla_data(attr);
1750 if (!thermal_event) {
1755 memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1757 thermal_event->orig = tz->id;
1758 thermal_event->event = event;
1760 /* send multicast genetlink message */
1761 genlmsg_end(skb, msg_header);
1763 result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
1766 dev_err(&tz->device, "Failed to send netlink event:%d", result);
1770 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
1772 static int genetlink_init(void)
1774 return genl_register_family(&thermal_event_genl_family);
1777 static void genetlink_exit(void)
1779 genl_unregister_family(&thermal_event_genl_family);
1781 #else /* !CONFIG_NET */
1782 static inline int genetlink_init(void) { return 0; }
1783 static inline void genetlink_exit(void) {}
1784 #endif /* !CONFIG_NET */
1786 static int __init thermal_register_governors(void)
1790 result = thermal_gov_step_wise_register();
1794 result = thermal_gov_fair_share_register();
1798 result = thermal_gov_bang_bang_register();
1802 return thermal_gov_user_space_register();
1805 static void thermal_unregister_governors(void)
1807 thermal_gov_step_wise_unregister();
1808 thermal_gov_fair_share_unregister();
1809 thermal_gov_bang_bang_unregister();
1810 thermal_gov_user_space_unregister();
1813 static int __init thermal_init(void)
1817 result = thermal_register_governors();
1821 result = class_register(&thermal_class);
1823 goto unregister_governors;
1825 result = genetlink_init();
1827 goto unregister_class;
1829 result = of_parse_thermal_zones();
1838 class_unregister(&thermal_class);
1839 unregister_governors:
1840 thermal_unregister_governors();
1842 idr_destroy(&thermal_tz_idr);
1843 idr_destroy(&thermal_cdev_idr);
1844 mutex_destroy(&thermal_idr_lock);
1845 mutex_destroy(&thermal_list_lock);
1846 mutex_destroy(&thermal_governor_lock);
1850 static void __exit thermal_exit(void)
1852 of_thermal_destroy_zones();
1854 class_unregister(&thermal_class);
1855 thermal_unregister_governors();
1856 idr_destroy(&thermal_tz_idr);
1857 idr_destroy(&thermal_cdev_idr);
1858 mutex_destroy(&thermal_idr_lock);
1859 mutex_destroy(&thermal_list_lock);
1860 mutex_destroy(&thermal_governor_lock);
1863 fs_initcall(thermal_init);
1864 module_exit(thermal_exit);