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 #include <linux/module.h>
27 #include <linux/device.h>
28 #include <linux/err.h>
29 #include <linux/slab.h>
30 #include <linux/kdev_t.h>
31 #include <linux/idr.h>
32 #include <linux/thermal.h>
33 #include <linux/spinlock.h>
34 #include <linux/reboot.h>
35 #include <net/netlink.h>
36 #include <net/genetlink.h>
38 MODULE_AUTHOR("Zhang Rui");
39 MODULE_DESCRIPTION("Generic thermal management sysfs support");
40 MODULE_LICENSE("GPL");
42 #define PREFIX "Thermal: "
44 struct thermal_cooling_device_instance {
46 char name[THERMAL_NAME_LENGTH];
47 struct thermal_zone_device *tz;
48 struct thermal_cooling_device *cdev;
50 char attr_name[THERMAL_NAME_LENGTH];
51 struct device_attribute attr;
52 struct list_head node;
55 static DEFINE_IDR(thermal_tz_idr);
56 static DEFINE_IDR(thermal_cdev_idr);
57 static DEFINE_MUTEX(thermal_idr_lock);
59 static LIST_HEAD(thermal_tz_list);
60 static LIST_HEAD(thermal_cdev_list);
61 static DEFINE_MUTEX(thermal_list_lock);
63 static unsigned int thermal_event_seqnum;
65 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
70 if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
75 err = idr_get_new(idr, NULL, id);
78 if (unlikely(err == -EAGAIN))
80 else if (unlikely(err))
83 *id = *id & MAX_ID_MASK;
87 static void release_idr(struct idr *idr, struct mutex *lock, int id)
96 /* sys I/F for thermal zone */
98 #define to_thermal_zone(_dev) \
99 container_of(_dev, struct thermal_zone_device, device)
102 type_show(struct device *dev, struct device_attribute *attr, char *buf)
104 struct thermal_zone_device *tz = to_thermal_zone(dev);
106 return sprintf(buf, "%s\n", tz->type);
110 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
112 struct thermal_zone_device *tz = to_thermal_zone(dev);
116 if (!tz->ops->get_temp)
119 ret = tz->ops->get_temp(tz, &temperature);
124 return sprintf(buf, "%ld\n", temperature);
128 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
130 struct thermal_zone_device *tz = to_thermal_zone(dev);
131 enum thermal_device_mode mode;
134 if (!tz->ops->get_mode)
137 result = tz->ops->get_mode(tz, &mode);
141 return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
146 mode_store(struct device *dev, struct device_attribute *attr,
147 const char *buf, size_t count)
149 struct thermal_zone_device *tz = to_thermal_zone(dev);
152 if (!tz->ops->set_mode)
155 if (!strncmp(buf, "enabled", sizeof("enabled")))
156 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
157 else if (!strncmp(buf, "disabled", sizeof("disabled")))
158 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
169 trip_point_type_show(struct device *dev, struct device_attribute *attr,
172 struct thermal_zone_device *tz = to_thermal_zone(dev);
173 enum thermal_trip_type type;
176 if (!tz->ops->get_trip_type)
179 if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
182 result = tz->ops->get_trip_type(tz, trip, &type);
187 case THERMAL_TRIP_CRITICAL:
188 return sprintf(buf, "critical\n");
189 case THERMAL_TRIP_HOT:
190 return sprintf(buf, "hot\n");
191 case THERMAL_TRIP_PASSIVE:
192 return sprintf(buf, "passive\n");
193 case THERMAL_TRIP_ACTIVE:
194 return sprintf(buf, "active\n");
196 return sprintf(buf, "unknown\n");
201 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
204 struct thermal_zone_device *tz = to_thermal_zone(dev);
208 if (!tz->ops->get_trip_temp)
211 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
214 ret = tz->ops->get_trip_temp(tz, trip, &temperature);
219 return sprintf(buf, "%ld\n", temperature);
223 passive_store(struct device *dev, struct device_attribute *attr,
224 const char *buf, size_t count)
226 struct thermal_zone_device *tz = to_thermal_zone(dev);
227 struct thermal_cooling_device *cdev = NULL;
230 if (!sscanf(buf, "%d\n", &state))
233 /* sanity check: values below 1000 millicelcius don't make sense
234 * and can cause the system to go into a thermal heart attack
236 if (state && state < 1000)
239 if (state && !tz->forced_passive) {
240 mutex_lock(&thermal_list_lock);
241 list_for_each_entry(cdev, &thermal_cdev_list, node) {
242 if (!strncmp("Processor", cdev->type,
243 sizeof("Processor")))
244 thermal_zone_bind_cooling_device(tz,
248 mutex_unlock(&thermal_list_lock);
249 if (!tz->passive_delay)
250 tz->passive_delay = 1000;
251 } else if (!state && tz->forced_passive) {
252 mutex_lock(&thermal_list_lock);
253 list_for_each_entry(cdev, &thermal_cdev_list, node) {
254 if (!strncmp("Processor", cdev->type,
255 sizeof("Processor")))
256 thermal_zone_unbind_cooling_device(tz,
260 mutex_unlock(&thermal_list_lock);
261 tz->passive_delay = 0;
267 tz->forced_passive = state;
269 thermal_zone_device_update(tz);
275 passive_show(struct device *dev, struct device_attribute *attr,
278 struct thermal_zone_device *tz = to_thermal_zone(dev);
280 return sprintf(buf, "%d\n", tz->forced_passive);
283 static DEVICE_ATTR(type, 0444, type_show, NULL);
284 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
285 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
286 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, \
289 static struct device_attribute trip_point_attrs[] = {
290 __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
291 __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
292 __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
293 __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
294 __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
295 __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
296 __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
297 __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
298 __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
299 __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
300 __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
301 __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
302 __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
303 __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
304 __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
305 __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
306 __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
307 __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
308 __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
309 __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
310 __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
311 __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
312 __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
313 __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
316 #define TRIP_POINT_ATTR_ADD(_dev, _index, result) \
318 result = device_create_file(_dev, \
319 &trip_point_attrs[_index * 2]); \
322 result = device_create_file(_dev, \
323 &trip_point_attrs[_index * 2 + 1]); \
326 #define TRIP_POINT_ATTR_REMOVE(_dev, _index) \
328 device_remove_file(_dev, &trip_point_attrs[_index * 2]); \
329 device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]); \
332 /* sys I/F for cooling device */
333 #define to_cooling_device(_dev) \
334 container_of(_dev, struct thermal_cooling_device, device)
337 thermal_cooling_device_type_show(struct device *dev,
338 struct device_attribute *attr, char *buf)
340 struct thermal_cooling_device *cdev = to_cooling_device(dev);
342 return sprintf(buf, "%s\n", cdev->type);
346 thermal_cooling_device_max_state_show(struct device *dev,
347 struct device_attribute *attr, char *buf)
349 struct thermal_cooling_device *cdev = to_cooling_device(dev);
353 ret = cdev->ops->get_max_state(cdev, &state);
356 return sprintf(buf, "%ld\n", state);
360 thermal_cooling_device_cur_state_show(struct device *dev,
361 struct device_attribute *attr, char *buf)
363 struct thermal_cooling_device *cdev = to_cooling_device(dev);
367 ret = cdev->ops->get_cur_state(cdev, &state);
370 return sprintf(buf, "%ld\n", state);
374 thermal_cooling_device_cur_state_store(struct device *dev,
375 struct device_attribute *attr,
376 const char *buf, size_t count)
378 struct thermal_cooling_device *cdev = to_cooling_device(dev);
382 if (!sscanf(buf, "%ld\n", &state))
388 result = cdev->ops->set_cur_state(cdev, state);
394 static struct device_attribute dev_attr_cdev_type =
395 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
396 static DEVICE_ATTR(max_state, 0444,
397 thermal_cooling_device_max_state_show, NULL);
398 static DEVICE_ATTR(cur_state, 0644,
399 thermal_cooling_device_cur_state_show,
400 thermal_cooling_device_cur_state_store);
403 thermal_cooling_device_trip_point_show(struct device *dev,
404 struct device_attribute *attr, char *buf)
406 struct thermal_cooling_device_instance *instance;
409 container_of(attr, struct thermal_cooling_device_instance, attr);
411 if (instance->trip == THERMAL_TRIPS_NONE)
412 return sprintf(buf, "-1\n");
414 return sprintf(buf, "%d\n", instance->trip);
417 /* Device management */
419 #if defined(CONFIG_THERMAL_HWMON)
422 #include <linux/hwmon.h>
424 /* thermal zone devices with the same type share one hwmon device */
425 struct thermal_hwmon_device {
426 char type[THERMAL_NAME_LENGTH];
427 struct device *device;
429 struct list_head tz_list;
430 struct list_head node;
433 struct thermal_hwmon_attr {
434 struct device_attribute attr;
438 /* one temperature input for each thermal zone */
439 struct thermal_hwmon_temp {
440 struct list_head hwmon_node;
441 struct thermal_zone_device *tz;
442 struct thermal_hwmon_attr temp_input; /* hwmon sys attr */
443 struct thermal_hwmon_attr temp_crit; /* hwmon sys attr */
446 static LIST_HEAD(thermal_hwmon_list);
449 name_show(struct device *dev, struct device_attribute *attr, char *buf)
451 struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
452 return sprintf(buf, "%s\n", hwmon->type);
454 static DEVICE_ATTR(name, 0444, name_show, NULL);
457 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
461 struct thermal_hwmon_attr *hwmon_attr
462 = container_of(attr, struct thermal_hwmon_attr, attr);
463 struct thermal_hwmon_temp *temp
464 = container_of(hwmon_attr, struct thermal_hwmon_temp,
466 struct thermal_zone_device *tz = temp->tz;
468 ret = tz->ops->get_temp(tz, &temperature);
473 return sprintf(buf, "%ld\n", temperature);
477 temp_crit_show(struct device *dev, struct device_attribute *attr,
480 struct thermal_hwmon_attr *hwmon_attr
481 = container_of(attr, struct thermal_hwmon_attr, attr);
482 struct thermal_hwmon_temp *temp
483 = container_of(hwmon_attr, struct thermal_hwmon_temp,
485 struct thermal_zone_device *tz = temp->tz;
489 ret = tz->ops->get_trip_temp(tz, 0, &temperature);
493 return sprintf(buf, "%ld\n", temperature);
497 static struct thermal_hwmon_device *
498 thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
500 struct thermal_hwmon_device *hwmon;
502 mutex_lock(&thermal_list_lock);
503 list_for_each_entry(hwmon, &thermal_hwmon_list, node)
504 if (!strcmp(hwmon->type, tz->type)) {
505 mutex_unlock(&thermal_list_lock);
508 mutex_unlock(&thermal_list_lock);
513 /* Find the temperature input matching a given thermal zone */
514 static struct thermal_hwmon_temp *
515 thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
516 const struct thermal_zone_device *tz)
518 struct thermal_hwmon_temp *temp;
520 mutex_lock(&thermal_list_lock);
521 list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
522 if (temp->tz == tz) {
523 mutex_unlock(&thermal_list_lock);
526 mutex_unlock(&thermal_list_lock);
532 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
534 struct thermal_hwmon_device *hwmon;
535 struct thermal_hwmon_temp *temp;
536 int new_hwmon_device = 1;
539 hwmon = thermal_hwmon_lookup_by_type(tz);
541 new_hwmon_device = 0;
542 goto register_sys_interface;
545 hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
549 INIT_LIST_HEAD(&hwmon->tz_list);
550 strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
551 hwmon->device = hwmon_device_register(NULL);
552 if (IS_ERR(hwmon->device)) {
553 result = PTR_ERR(hwmon->device);
556 dev_set_drvdata(hwmon->device, hwmon);
557 result = device_create_file(hwmon->device, &dev_attr_name);
561 register_sys_interface:
562 temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
565 goto unregister_name;
571 snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH,
572 "temp%d_input", hwmon->count);
573 temp->temp_input.attr.attr.name = temp->temp_input.name;
574 temp->temp_input.attr.attr.mode = 0444;
575 temp->temp_input.attr.show = temp_input_show;
576 sysfs_attr_init(&temp->temp_input.attr.attr);
577 result = device_create_file(hwmon->device, &temp->temp_input.attr);
581 if (tz->ops->get_crit_temp) {
582 unsigned long temperature;
583 if (!tz->ops->get_crit_temp(tz, &temperature)) {
584 snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH,
585 "temp%d_crit", hwmon->count);
586 temp->temp_crit.attr.attr.name = temp->temp_crit.name;
587 temp->temp_crit.attr.attr.mode = 0444;
588 temp->temp_crit.attr.show = temp_crit_show;
589 sysfs_attr_init(&temp->temp_crit.attr.attr);
590 result = device_create_file(hwmon->device,
591 &temp->temp_crit.attr);
593 goto unregister_input;
597 mutex_lock(&thermal_list_lock);
598 if (new_hwmon_device)
599 list_add_tail(&hwmon->node, &thermal_hwmon_list);
600 list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
601 mutex_unlock(&thermal_list_lock);
606 device_remove_file(hwmon->device, &temp->temp_input.attr);
610 if (new_hwmon_device) {
611 device_remove_file(hwmon->device, &dev_attr_name);
612 hwmon_device_unregister(hwmon->device);
615 if (new_hwmon_device)
622 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
624 struct thermal_hwmon_device *hwmon;
625 struct thermal_hwmon_temp *temp;
627 hwmon = thermal_hwmon_lookup_by_type(tz);
628 if (unlikely(!hwmon)) {
629 /* Should never happen... */
630 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
634 temp = thermal_hwmon_lookup_temp(hwmon, tz);
635 if (unlikely(!temp)) {
636 /* Should never happen... */
637 dev_dbg(&tz->device, "temperature input lookup failed!\n");
641 device_remove_file(hwmon->device, &temp->temp_input.attr);
642 if (tz->ops->get_crit_temp)
643 device_remove_file(hwmon->device, &temp->temp_crit.attr);
645 mutex_lock(&thermal_list_lock);
646 list_del(&temp->hwmon_node);
648 if (!list_empty(&hwmon->tz_list)) {
649 mutex_unlock(&thermal_list_lock);
652 list_del(&hwmon->node);
653 mutex_unlock(&thermal_list_lock);
655 device_remove_file(hwmon->device, &dev_attr_name);
656 hwmon_device_unregister(hwmon->device);
661 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
667 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
672 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
675 cancel_delayed_work(&(tz->poll_queue));
681 schedule_delayed_work(&(tz->poll_queue),
682 round_jiffies(msecs_to_jiffies(delay)));
684 schedule_delayed_work(&(tz->poll_queue),
685 msecs_to_jiffies(delay));
688 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
689 int temp, int trip_temp, int trip)
692 struct thermal_cooling_device_instance *instance;
693 struct thermal_cooling_device *cdev;
694 long state, max_state;
699 * Calculate the thermal trend (using the passive cooling equation)
700 * and modify the performance limit for all passive cooling devices
701 * accordingly. Note that we assume symmetry.
703 if (temp >= trip_temp) {
706 trend = (tz->tc1 * (temp - tz->last_temperature)) +
707 (tz->tc2 * (temp - trip_temp));
711 list_for_each_entry(instance, &tz->cooling_devices,
713 if (instance->trip != trip)
715 cdev = instance->cdev;
716 cdev->ops->get_cur_state(cdev, &state);
717 cdev->ops->get_max_state(cdev, &max_state);
718 if (state++ < max_state)
719 cdev->ops->set_cur_state(cdev, state);
721 } else if (trend < 0) { /* Cooling off? */
722 list_for_each_entry(instance, &tz->cooling_devices,
724 if (instance->trip != trip)
726 cdev = instance->cdev;
727 cdev->ops->get_cur_state(cdev, &state);
728 cdev->ops->get_max_state(cdev, &max_state);
730 cdev->ops->set_cur_state(cdev, --state);
739 * Implement passive cooling hysteresis to slowly increase performance
740 * and avoid thrashing around the passive trip point. Note that we
743 list_for_each_entry(instance, &tz->cooling_devices, node) {
744 if (instance->trip != trip)
746 cdev = instance->cdev;
747 cdev->ops->get_cur_state(cdev, &state);
748 cdev->ops->get_max_state(cdev, &max_state);
750 cdev->ops->set_cur_state(cdev, --state);
756 static void thermal_zone_device_check(struct work_struct *work)
758 struct thermal_zone_device *tz = container_of(work, struct
761 thermal_zone_device_update(tz);
765 * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
766 * @tz: thermal zone device
767 * @trip: indicates which trip point the cooling devices is
768 * associated with in this thermal zone.
769 * @cdev: thermal cooling device
771 * This function is usually called in the thermal zone device .bind callback.
773 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
775 struct thermal_cooling_device *cdev)
777 struct thermal_cooling_device_instance *dev;
778 struct thermal_cooling_device_instance *pos;
779 struct thermal_zone_device *pos1;
780 struct thermal_cooling_device *pos2;
783 if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
786 list_for_each_entry(pos1, &thermal_tz_list, node) {
790 list_for_each_entry(pos2, &thermal_cdev_list, node) {
795 if (tz != pos1 || cdev != pos2)
799 kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
805 result = get_idr(&tz->idr, &tz->lock, &dev->id);
809 sprintf(dev->name, "cdev%d", dev->id);
811 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
815 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
816 sysfs_attr_init(&dev->attr.attr);
817 dev->attr.attr.name = dev->attr_name;
818 dev->attr.attr.mode = 0444;
819 dev->attr.show = thermal_cooling_device_trip_point_show;
820 result = device_create_file(&tz->device, &dev->attr);
822 goto remove_symbol_link;
824 mutex_lock(&tz->lock);
825 list_for_each_entry(pos, &tz->cooling_devices, node)
826 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
831 list_add_tail(&dev->node, &tz->cooling_devices);
832 mutex_unlock(&tz->lock);
837 device_remove_file(&tz->device, &dev->attr);
839 sysfs_remove_link(&tz->device.kobj, dev->name);
841 release_idr(&tz->idr, &tz->lock, dev->id);
847 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
850 * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
851 * @tz: thermal zone device
852 * @trip: indicates which trip point the cooling devices is
853 * associated with in this thermal zone.
854 * @cdev: thermal cooling device
856 * This function is usually called in the thermal zone device .unbind callback.
858 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
860 struct thermal_cooling_device *cdev)
862 struct thermal_cooling_device_instance *pos, *next;
864 mutex_lock(&tz->lock);
865 list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
866 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
867 list_del(&pos->node);
868 mutex_unlock(&tz->lock);
872 mutex_unlock(&tz->lock);
877 device_remove_file(&tz->device, &pos->attr);
878 sysfs_remove_link(&tz->device.kobj, pos->name);
879 release_idr(&tz->idr, &tz->lock, pos->id);
884 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
886 static void thermal_release(struct device *dev)
888 struct thermal_zone_device *tz;
889 struct thermal_cooling_device *cdev;
891 if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
892 tz = to_thermal_zone(dev);
895 cdev = to_cooling_device(dev);
900 static struct class thermal_class = {
902 .dev_release = thermal_release,
906 * thermal_cooling_device_register - register a new thermal cooling device
907 * @type: the thermal cooling device type.
908 * @devdata: device private data.
909 * @ops: standard thermal cooling devices callbacks.
911 struct thermal_cooling_device *thermal_cooling_device_register(
912 char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
914 struct thermal_cooling_device *cdev;
915 struct thermal_zone_device *pos;
918 if (strlen(type) >= THERMAL_NAME_LENGTH)
919 return ERR_PTR(-EINVAL);
921 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
923 return ERR_PTR(-EINVAL);
925 cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
927 return ERR_PTR(-ENOMEM);
929 result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
932 return ERR_PTR(result);
935 strcpy(cdev->type, type);
937 cdev->device.class = &thermal_class;
938 cdev->devdata = devdata;
939 dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
940 result = device_register(&cdev->device);
942 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
944 return ERR_PTR(result);
949 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
954 result = device_create_file(&cdev->device, &dev_attr_max_state);
958 result = device_create_file(&cdev->device, &dev_attr_cur_state);
962 mutex_lock(&thermal_list_lock);
963 list_add(&cdev->node, &thermal_cdev_list);
964 list_for_each_entry(pos, &thermal_tz_list, node) {
967 result = pos->ops->bind(pos, cdev);
972 mutex_unlock(&thermal_list_lock);
978 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
979 device_unregister(&cdev->device);
980 return ERR_PTR(result);
983 EXPORT_SYMBOL(thermal_cooling_device_register);
986 * thermal_cooling_device_unregister - removes the registered thermal cooling device
987 * @cdev: the thermal cooling device to remove.
989 * thermal_cooling_device_unregister() must be called when the device is no
992 void thermal_cooling_device_unregister(struct
993 thermal_cooling_device
996 struct thermal_zone_device *tz;
997 struct thermal_cooling_device *pos = NULL;
1002 mutex_lock(&thermal_list_lock);
1003 list_for_each_entry(pos, &thermal_cdev_list, node)
1007 /* thermal cooling device not found */
1008 mutex_unlock(&thermal_list_lock);
1011 list_del(&cdev->node);
1012 list_for_each_entry(tz, &thermal_tz_list, node) {
1013 if (!tz->ops->unbind)
1015 tz->ops->unbind(tz, cdev);
1017 mutex_unlock(&thermal_list_lock);
1019 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1020 device_remove_file(&cdev->device, &dev_attr_max_state);
1021 device_remove_file(&cdev->device, &dev_attr_cur_state);
1023 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1024 device_unregister(&cdev->device);
1028 EXPORT_SYMBOL(thermal_cooling_device_unregister);
1031 * thermal_zone_device_update - force an update of a thermal zone's state
1032 * @ttz: the thermal zone to update
1035 void thermal_zone_device_update(struct thermal_zone_device *tz)
1038 long temp, trip_temp;
1039 enum thermal_trip_type trip_type;
1040 struct thermal_cooling_device_instance *instance;
1041 struct thermal_cooling_device *cdev;
1043 mutex_lock(&tz->lock);
1045 if (tz->ops->get_temp(tz, &temp)) {
1046 /* get_temp failed - retry it later */
1047 printk(KERN_WARNING PREFIX "failed to read out thermal zone "
1052 for (count = 0; count < tz->trips; count++) {
1053 tz->ops->get_trip_type(tz, count, &trip_type);
1054 tz->ops->get_trip_temp(tz, count, &trip_temp);
1056 switch (trip_type) {
1057 case THERMAL_TRIP_CRITICAL:
1058 if (temp >= trip_temp) {
1059 if (tz->ops->notify)
1060 ret = tz->ops->notify(tz, count,
1064 "Critical temperature reached (%ld C), shutting down.\n",
1066 orderly_poweroff(true);
1070 case THERMAL_TRIP_HOT:
1071 if (temp >= trip_temp)
1072 if (tz->ops->notify)
1073 tz->ops->notify(tz, count, trip_type);
1075 case THERMAL_TRIP_ACTIVE:
1076 list_for_each_entry(instance, &tz->cooling_devices,
1078 if (instance->trip != count)
1081 cdev = instance->cdev;
1083 if (temp >= trip_temp)
1084 cdev->ops->set_cur_state(cdev, 1);
1086 cdev->ops->set_cur_state(cdev, 0);
1089 case THERMAL_TRIP_PASSIVE:
1090 if (temp >= trip_temp || tz->passive)
1091 thermal_zone_device_passive(tz, temp,
1097 if (tz->forced_passive)
1098 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1099 THERMAL_TRIPS_NONE);
1101 tz->last_temperature = temp;
1105 thermal_zone_device_set_polling(tz, tz->passive_delay);
1106 else if (tz->polling_delay)
1107 thermal_zone_device_set_polling(tz, tz->polling_delay);
1109 thermal_zone_device_set_polling(tz, 0);
1110 mutex_unlock(&tz->lock);
1112 EXPORT_SYMBOL(thermal_zone_device_update);
1115 * thermal_zone_device_register - register a new thermal zone device
1116 * @type: the thermal zone device type
1117 * @trips: the number of trip points the thermal zone support
1118 * @devdata: private device data
1119 * @ops: standard thermal zone device callbacks
1120 * @tc1: thermal coefficient 1 for passive calculations
1121 * @tc2: thermal coefficient 2 for passive calculations
1122 * @passive_delay: number of milliseconds to wait between polls when
1123 * performing passive cooling
1124 * @polling_delay: number of milliseconds to wait between polls when checking
1125 * whether trip points have been crossed (0 for interrupt
1128 * thermal_zone_device_unregister() must be called when the device is no
1129 * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1130 * section 11.1.5.1 of the ACPI specification 3.0.
1132 struct thermal_zone_device *thermal_zone_device_register(char *type,
1133 int trips, void *devdata,
1134 const struct thermal_zone_device_ops *ops,
1135 int tc1, int tc2, int passive_delay, int polling_delay)
1137 struct thermal_zone_device *tz;
1138 struct thermal_cooling_device *pos;
1139 enum thermal_trip_type trip_type;
1144 if (strlen(type) >= THERMAL_NAME_LENGTH)
1145 return ERR_PTR(-EINVAL);
1147 if (trips > THERMAL_MAX_TRIPS || trips < 0)
1148 return ERR_PTR(-EINVAL);
1150 if (!ops || !ops->get_temp)
1151 return ERR_PTR(-EINVAL);
1153 tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1155 return ERR_PTR(-ENOMEM);
1157 INIT_LIST_HEAD(&tz->cooling_devices);
1159 mutex_init(&tz->lock);
1160 result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1163 return ERR_PTR(result);
1166 strcpy(tz->type, type);
1168 tz->device.class = &thermal_class;
1169 tz->devdata = devdata;
1173 tz->passive_delay = passive_delay;
1174 tz->polling_delay = polling_delay;
1176 dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1177 result = device_register(&tz->device);
1179 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1181 return ERR_PTR(result);
1186 result = device_create_file(&tz->device, &dev_attr_type);
1191 result = device_create_file(&tz->device, &dev_attr_temp);
1195 if (ops->get_mode) {
1196 result = device_create_file(&tz->device, &dev_attr_mode);
1201 for (count = 0; count < trips; count++) {
1202 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
1205 tz->ops->get_trip_type(tz, count, &trip_type);
1206 if (trip_type == THERMAL_TRIP_PASSIVE)
1211 result = device_create_file(&tz->device,
1217 result = thermal_add_hwmon_sysfs(tz);
1221 mutex_lock(&thermal_list_lock);
1222 list_add_tail(&tz->node, &thermal_tz_list);
1224 list_for_each_entry(pos, &thermal_cdev_list, node) {
1225 result = ops->bind(tz, pos);
1229 mutex_unlock(&thermal_list_lock);
1231 INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1233 thermal_zone_device_update(tz);
1239 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1240 device_unregister(&tz->device);
1241 return ERR_PTR(result);
1244 EXPORT_SYMBOL(thermal_zone_device_register);
1247 * thermal_device_unregister - removes the registered thermal zone device
1248 * @tz: the thermal zone device to remove
1250 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1252 struct thermal_cooling_device *cdev;
1253 struct thermal_zone_device *pos = NULL;
1259 mutex_lock(&thermal_list_lock);
1260 list_for_each_entry(pos, &thermal_tz_list, node)
1264 /* thermal zone device not found */
1265 mutex_unlock(&thermal_list_lock);
1268 list_del(&tz->node);
1269 if (tz->ops->unbind)
1270 list_for_each_entry(cdev, &thermal_cdev_list, node)
1271 tz->ops->unbind(tz, cdev);
1272 mutex_unlock(&thermal_list_lock);
1274 thermal_zone_device_set_polling(tz, 0);
1277 device_remove_file(&tz->device, &dev_attr_type);
1278 device_remove_file(&tz->device, &dev_attr_temp);
1279 if (tz->ops->get_mode)
1280 device_remove_file(&tz->device, &dev_attr_mode);
1282 for (count = 0; count < tz->trips; count++)
1283 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
1285 thermal_remove_hwmon_sysfs(tz);
1286 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1287 idr_destroy(&tz->idr);
1288 mutex_destroy(&tz->lock);
1289 device_unregister(&tz->device);
1293 EXPORT_SYMBOL(thermal_zone_device_unregister);
1296 static struct genl_family thermal_event_genl_family = {
1297 .id = GENL_ID_GENERATE,
1298 .name = THERMAL_GENL_FAMILY_NAME,
1299 .version = THERMAL_GENL_VERSION,
1300 .maxattr = THERMAL_GENL_ATTR_MAX,
1303 static struct genl_multicast_group thermal_event_mcgrp = {
1304 .name = THERMAL_GENL_MCAST_GROUP_NAME,
1307 int generate_netlink_event(u32 orig, enum events event)
1309 struct sk_buff *skb;
1310 struct nlattr *attr;
1311 struct thermal_genl_event *thermal_event;
1316 /* allocate memory */
1317 size = nla_total_size(sizeof(struct thermal_genl_event)) + \
1320 skb = genlmsg_new(size, GFP_ATOMIC);
1324 /* add the genetlink message header */
1325 msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1326 &thermal_event_genl_family, 0,
1327 THERMAL_GENL_CMD_EVENT);
1334 attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, \
1335 sizeof(struct thermal_genl_event));
1342 thermal_event = nla_data(attr);
1343 if (!thermal_event) {
1348 memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1350 thermal_event->orig = orig;
1351 thermal_event->event = event;
1353 /* send multicast genetlink message */
1354 result = genlmsg_end(skb, msg_header);
1360 result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1362 printk(KERN_INFO "failed to send netlink event:%d", result);
1366 EXPORT_SYMBOL(generate_netlink_event);
1368 static int genetlink_init(void)
1372 result = genl_register_family(&thermal_event_genl_family);
1376 result = genl_register_mc_group(&thermal_event_genl_family,
1377 &thermal_event_mcgrp);
1379 genl_unregister_family(&thermal_event_genl_family);
1383 static void genetlink_exit(void)
1385 genl_unregister_family(&thermal_event_genl_family);
1387 #else /* !CONFIG_NET */
1388 static inline int genetlink_init(void) { return 0; }
1389 static inline void genetlink_exit(void) {}
1390 #endif /* !CONFIG_NET */
1392 static int __init thermal_init(void)
1396 result = class_register(&thermal_class);
1398 idr_destroy(&thermal_tz_idr);
1399 idr_destroy(&thermal_cdev_idr);
1400 mutex_destroy(&thermal_idr_lock);
1401 mutex_destroy(&thermal_list_lock);
1403 result = genetlink_init();
1407 static void __exit thermal_exit(void)
1409 class_unregister(&thermal_class);
1410 idr_destroy(&thermal_tz_idr);
1411 idr_destroy(&thermal_cdev_idr);
1412 mutex_destroy(&thermal_idr_lock);
1413 mutex_destroy(&thermal_list_lock);
1417 fs_initcall(thermal_init);
1418 module_exit(thermal_exit);