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>
423 static LIST_HEAD(thermal_hwmon_list);
426 name_show(struct device *dev, struct device_attribute *attr, char *buf)
428 struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
429 return sprintf(buf, "%s\n", hwmon->type);
431 static DEVICE_ATTR(name, 0444, name_show, NULL);
434 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
438 struct thermal_hwmon_attr *hwmon_attr
439 = container_of(attr, struct thermal_hwmon_attr, attr);
440 struct thermal_zone_device *tz
441 = container_of(hwmon_attr, struct thermal_zone_device,
444 ret = tz->ops->get_temp(tz, &temperature);
449 return sprintf(buf, "%ld\n", temperature);
453 temp_crit_show(struct device *dev, struct device_attribute *attr,
456 struct thermal_hwmon_attr *hwmon_attr
457 = container_of(attr, struct thermal_hwmon_attr, attr);
458 struct thermal_zone_device *tz
459 = container_of(hwmon_attr, struct thermal_zone_device,
464 ret = tz->ops->get_trip_temp(tz, 0, &temperature);
468 return sprintf(buf, "%ld\n", temperature);
473 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
475 struct thermal_hwmon_device *hwmon;
476 int new_hwmon_device = 1;
479 mutex_lock(&thermal_list_lock);
480 list_for_each_entry(hwmon, &thermal_hwmon_list, node)
481 if (!strcmp(hwmon->type, tz->type)) {
482 new_hwmon_device = 0;
483 mutex_unlock(&thermal_list_lock);
484 goto register_sys_interface;
486 mutex_unlock(&thermal_list_lock);
488 hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
492 INIT_LIST_HEAD(&hwmon->tz_list);
493 strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
494 hwmon->device = hwmon_device_register(NULL);
495 if (IS_ERR(hwmon->device)) {
496 result = PTR_ERR(hwmon->device);
499 dev_set_drvdata(hwmon->device, hwmon);
500 result = device_create_file(hwmon->device, &dev_attr_name);
504 register_sys_interface:
508 snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH,
509 "temp%d_input", hwmon->count);
510 tz->temp_input.attr.attr.name = tz->temp_input.name;
511 tz->temp_input.attr.attr.mode = 0444;
512 tz->temp_input.attr.show = temp_input_show;
513 sysfs_attr_init(&tz->temp_input.attr.attr);
514 result = device_create_file(hwmon->device, &tz->temp_input.attr);
516 goto unregister_name;
518 if (tz->ops->get_crit_temp) {
519 unsigned long temperature;
520 if (!tz->ops->get_crit_temp(tz, &temperature)) {
521 snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH,
522 "temp%d_crit", hwmon->count);
523 tz->temp_crit.attr.attr.name = tz->temp_crit.name;
524 tz->temp_crit.attr.attr.mode = 0444;
525 tz->temp_crit.attr.show = temp_crit_show;
526 sysfs_attr_init(&tz->temp_crit.attr.attr);
527 result = device_create_file(hwmon->device,
528 &tz->temp_crit.attr);
530 goto unregister_input;
534 mutex_lock(&thermal_list_lock);
535 if (new_hwmon_device)
536 list_add_tail(&hwmon->node, &thermal_hwmon_list);
537 list_add_tail(&tz->hwmon_node, &hwmon->tz_list);
538 mutex_unlock(&thermal_list_lock);
543 device_remove_file(hwmon->device, &tz->temp_input.attr);
545 if (new_hwmon_device) {
546 device_remove_file(hwmon->device, &dev_attr_name);
547 hwmon_device_unregister(hwmon->device);
550 if (new_hwmon_device)
557 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
559 struct thermal_hwmon_device *hwmon = tz->hwmon;
562 device_remove_file(hwmon->device, &tz->temp_input.attr);
563 if (tz->ops->get_crit_temp)
564 device_remove_file(hwmon->device, &tz->temp_crit.attr);
566 mutex_lock(&thermal_list_lock);
567 list_del(&tz->hwmon_node);
568 if (!list_empty(&hwmon->tz_list)) {
569 mutex_unlock(&thermal_list_lock);
572 list_del(&hwmon->node);
573 mutex_unlock(&thermal_list_lock);
575 device_remove_file(hwmon->device, &dev_attr_name);
576 hwmon_device_unregister(hwmon->device);
581 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
587 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
592 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
595 cancel_delayed_work(&(tz->poll_queue));
601 schedule_delayed_work(&(tz->poll_queue),
602 round_jiffies(msecs_to_jiffies(delay)));
604 schedule_delayed_work(&(tz->poll_queue),
605 msecs_to_jiffies(delay));
608 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
609 int temp, int trip_temp, int trip)
612 struct thermal_cooling_device_instance *instance;
613 struct thermal_cooling_device *cdev;
614 long state, max_state;
619 * Calculate the thermal trend (using the passive cooling equation)
620 * and modify the performance limit for all passive cooling devices
621 * accordingly. Note that we assume symmetry.
623 if (temp >= trip_temp) {
626 trend = (tz->tc1 * (temp - tz->last_temperature)) +
627 (tz->tc2 * (temp - trip_temp));
631 list_for_each_entry(instance, &tz->cooling_devices,
633 if (instance->trip != trip)
635 cdev = instance->cdev;
636 cdev->ops->get_cur_state(cdev, &state);
637 cdev->ops->get_max_state(cdev, &max_state);
638 if (state++ < max_state)
639 cdev->ops->set_cur_state(cdev, state);
641 } else if (trend < 0) { /* Cooling off? */
642 list_for_each_entry(instance, &tz->cooling_devices,
644 if (instance->trip != trip)
646 cdev = instance->cdev;
647 cdev->ops->get_cur_state(cdev, &state);
648 cdev->ops->get_max_state(cdev, &max_state);
650 cdev->ops->set_cur_state(cdev, --state);
659 * Implement passive cooling hysteresis to slowly increase performance
660 * and avoid thrashing around the passive trip point. Note that we
663 list_for_each_entry(instance, &tz->cooling_devices, node) {
664 if (instance->trip != trip)
666 cdev = instance->cdev;
667 cdev->ops->get_cur_state(cdev, &state);
668 cdev->ops->get_max_state(cdev, &max_state);
670 cdev->ops->set_cur_state(cdev, --state);
676 static void thermal_zone_device_check(struct work_struct *work)
678 struct thermal_zone_device *tz = container_of(work, struct
681 thermal_zone_device_update(tz);
685 * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
686 * @tz: thermal zone device
687 * @trip: indicates which trip point the cooling devices is
688 * associated with in this thermal zone.
689 * @cdev: thermal cooling device
691 * This function is usually called in the thermal zone device .bind callback.
693 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
695 struct thermal_cooling_device *cdev)
697 struct thermal_cooling_device_instance *dev;
698 struct thermal_cooling_device_instance *pos;
699 struct thermal_zone_device *pos1;
700 struct thermal_cooling_device *pos2;
703 if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
706 list_for_each_entry(pos1, &thermal_tz_list, node) {
710 list_for_each_entry(pos2, &thermal_cdev_list, node) {
715 if (tz != pos1 || cdev != pos2)
719 kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
725 result = get_idr(&tz->idr, &tz->lock, &dev->id);
729 sprintf(dev->name, "cdev%d", dev->id);
731 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
735 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
736 sysfs_attr_init(&dev->attr.attr);
737 dev->attr.attr.name = dev->attr_name;
738 dev->attr.attr.mode = 0444;
739 dev->attr.show = thermal_cooling_device_trip_point_show;
740 result = device_create_file(&tz->device, &dev->attr);
742 goto remove_symbol_link;
744 mutex_lock(&tz->lock);
745 list_for_each_entry(pos, &tz->cooling_devices, node)
746 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
751 list_add_tail(&dev->node, &tz->cooling_devices);
752 mutex_unlock(&tz->lock);
757 device_remove_file(&tz->device, &dev->attr);
759 sysfs_remove_link(&tz->device.kobj, dev->name);
761 release_idr(&tz->idr, &tz->lock, dev->id);
767 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
770 * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
771 * @tz: thermal zone device
772 * @trip: indicates which trip point the cooling devices is
773 * associated with in this thermal zone.
774 * @cdev: thermal cooling device
776 * This function is usually called in the thermal zone device .unbind callback.
778 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
780 struct thermal_cooling_device *cdev)
782 struct thermal_cooling_device_instance *pos, *next;
784 mutex_lock(&tz->lock);
785 list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
786 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
787 list_del(&pos->node);
788 mutex_unlock(&tz->lock);
792 mutex_unlock(&tz->lock);
797 device_remove_file(&tz->device, &pos->attr);
798 sysfs_remove_link(&tz->device.kobj, pos->name);
799 release_idr(&tz->idr, &tz->lock, pos->id);
804 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
806 static void thermal_release(struct device *dev)
808 struct thermal_zone_device *tz;
809 struct thermal_cooling_device *cdev;
811 if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
812 tz = to_thermal_zone(dev);
815 cdev = to_cooling_device(dev);
820 static struct class thermal_class = {
822 .dev_release = thermal_release,
826 * thermal_cooling_device_register - register a new thermal cooling device
827 * @type: the thermal cooling device type.
828 * @devdata: device private data.
829 * @ops: standard thermal cooling devices callbacks.
831 struct thermal_cooling_device *thermal_cooling_device_register(
832 char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
834 struct thermal_cooling_device *cdev;
835 struct thermal_zone_device *pos;
838 if (strlen(type) >= THERMAL_NAME_LENGTH)
839 return ERR_PTR(-EINVAL);
841 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
843 return ERR_PTR(-EINVAL);
845 cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
847 return ERR_PTR(-ENOMEM);
849 result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
852 return ERR_PTR(result);
855 strcpy(cdev->type, type);
857 cdev->device.class = &thermal_class;
858 cdev->devdata = devdata;
859 dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
860 result = device_register(&cdev->device);
862 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
864 return ERR_PTR(result);
869 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
874 result = device_create_file(&cdev->device, &dev_attr_max_state);
878 result = device_create_file(&cdev->device, &dev_attr_cur_state);
882 mutex_lock(&thermal_list_lock);
883 list_add(&cdev->node, &thermal_cdev_list);
884 list_for_each_entry(pos, &thermal_tz_list, node) {
887 result = pos->ops->bind(pos, cdev);
892 mutex_unlock(&thermal_list_lock);
898 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
899 device_unregister(&cdev->device);
900 return ERR_PTR(result);
903 EXPORT_SYMBOL(thermal_cooling_device_register);
906 * thermal_cooling_device_unregister - removes the registered thermal cooling device
907 * @cdev: the thermal cooling device to remove.
909 * thermal_cooling_device_unregister() must be called when the device is no
912 void thermal_cooling_device_unregister(struct
913 thermal_cooling_device
916 struct thermal_zone_device *tz;
917 struct thermal_cooling_device *pos = NULL;
922 mutex_lock(&thermal_list_lock);
923 list_for_each_entry(pos, &thermal_cdev_list, node)
927 /* thermal cooling device not found */
928 mutex_unlock(&thermal_list_lock);
931 list_del(&cdev->node);
932 list_for_each_entry(tz, &thermal_tz_list, node) {
933 if (!tz->ops->unbind)
935 tz->ops->unbind(tz, cdev);
937 mutex_unlock(&thermal_list_lock);
939 device_remove_file(&cdev->device, &dev_attr_cdev_type);
940 device_remove_file(&cdev->device, &dev_attr_max_state);
941 device_remove_file(&cdev->device, &dev_attr_cur_state);
943 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
944 device_unregister(&cdev->device);
948 EXPORT_SYMBOL(thermal_cooling_device_unregister);
951 * thermal_zone_device_update - force an update of a thermal zone's state
952 * @ttz: the thermal zone to update
955 void thermal_zone_device_update(struct thermal_zone_device *tz)
958 long temp, trip_temp;
959 enum thermal_trip_type trip_type;
960 struct thermal_cooling_device_instance *instance;
961 struct thermal_cooling_device *cdev;
963 mutex_lock(&tz->lock);
965 if (tz->ops->get_temp(tz, &temp)) {
966 /* get_temp failed - retry it later */
967 printk(KERN_WARNING PREFIX "failed to read out thermal zone "
972 for (count = 0; count < tz->trips; count++) {
973 tz->ops->get_trip_type(tz, count, &trip_type);
974 tz->ops->get_trip_temp(tz, count, &trip_temp);
977 case THERMAL_TRIP_CRITICAL:
978 if (temp >= trip_temp) {
980 ret = tz->ops->notify(tz, count,
984 "Critical temperature reached (%ld C), shutting down.\n",
986 orderly_poweroff(true);
990 case THERMAL_TRIP_HOT:
991 if (temp >= trip_temp)
993 tz->ops->notify(tz, count, trip_type);
995 case THERMAL_TRIP_ACTIVE:
996 list_for_each_entry(instance, &tz->cooling_devices,
998 if (instance->trip != count)
1001 cdev = instance->cdev;
1003 if (temp >= trip_temp)
1004 cdev->ops->set_cur_state(cdev, 1);
1006 cdev->ops->set_cur_state(cdev, 0);
1009 case THERMAL_TRIP_PASSIVE:
1010 if (temp >= trip_temp || tz->passive)
1011 thermal_zone_device_passive(tz, temp,
1017 if (tz->forced_passive)
1018 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1019 THERMAL_TRIPS_NONE);
1021 tz->last_temperature = temp;
1025 thermal_zone_device_set_polling(tz, tz->passive_delay);
1026 else if (tz->polling_delay)
1027 thermal_zone_device_set_polling(tz, tz->polling_delay);
1029 thermal_zone_device_set_polling(tz, 0);
1030 mutex_unlock(&tz->lock);
1032 EXPORT_SYMBOL(thermal_zone_device_update);
1035 * thermal_zone_device_register - register a new thermal zone device
1036 * @type: the thermal zone device type
1037 * @trips: the number of trip points the thermal zone support
1038 * @devdata: private device data
1039 * @ops: standard thermal zone device callbacks
1040 * @tc1: thermal coefficient 1 for passive calculations
1041 * @tc2: thermal coefficient 2 for passive calculations
1042 * @passive_delay: number of milliseconds to wait between polls when
1043 * performing passive cooling
1044 * @polling_delay: number of milliseconds to wait between polls when checking
1045 * whether trip points have been crossed (0 for interrupt
1048 * thermal_zone_device_unregister() must be called when the device is no
1049 * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1050 * section 11.1.5.1 of the ACPI specification 3.0.
1052 struct thermal_zone_device *thermal_zone_device_register(char *type,
1053 int trips, void *devdata,
1054 const struct thermal_zone_device_ops *ops,
1055 int tc1, int tc2, int passive_delay, int polling_delay)
1057 struct thermal_zone_device *tz;
1058 struct thermal_cooling_device *pos;
1059 enum thermal_trip_type trip_type;
1064 if (strlen(type) >= THERMAL_NAME_LENGTH)
1065 return ERR_PTR(-EINVAL);
1067 if (trips > THERMAL_MAX_TRIPS || trips < 0)
1068 return ERR_PTR(-EINVAL);
1070 if (!ops || !ops->get_temp)
1071 return ERR_PTR(-EINVAL);
1073 tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1075 return ERR_PTR(-ENOMEM);
1077 INIT_LIST_HEAD(&tz->cooling_devices);
1079 mutex_init(&tz->lock);
1080 result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1083 return ERR_PTR(result);
1086 strcpy(tz->type, type);
1088 tz->device.class = &thermal_class;
1089 tz->devdata = devdata;
1093 tz->passive_delay = passive_delay;
1094 tz->polling_delay = polling_delay;
1096 dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1097 result = device_register(&tz->device);
1099 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1101 return ERR_PTR(result);
1106 result = device_create_file(&tz->device, &dev_attr_type);
1111 result = device_create_file(&tz->device, &dev_attr_temp);
1115 if (ops->get_mode) {
1116 result = device_create_file(&tz->device, &dev_attr_mode);
1121 for (count = 0; count < trips; count++) {
1122 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
1125 tz->ops->get_trip_type(tz, count, &trip_type);
1126 if (trip_type == THERMAL_TRIP_PASSIVE)
1131 result = device_create_file(&tz->device,
1137 result = thermal_add_hwmon_sysfs(tz);
1141 mutex_lock(&thermal_list_lock);
1142 list_add_tail(&tz->node, &thermal_tz_list);
1144 list_for_each_entry(pos, &thermal_cdev_list, node) {
1145 result = ops->bind(tz, pos);
1149 mutex_unlock(&thermal_list_lock);
1151 INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1153 thermal_zone_device_update(tz);
1159 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1160 device_unregister(&tz->device);
1161 return ERR_PTR(result);
1164 EXPORT_SYMBOL(thermal_zone_device_register);
1167 * thermal_device_unregister - removes the registered thermal zone device
1168 * @tz: the thermal zone device to remove
1170 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1172 struct thermal_cooling_device *cdev;
1173 struct thermal_zone_device *pos = NULL;
1179 mutex_lock(&thermal_list_lock);
1180 list_for_each_entry(pos, &thermal_tz_list, node)
1184 /* thermal zone device not found */
1185 mutex_unlock(&thermal_list_lock);
1188 list_del(&tz->node);
1189 if (tz->ops->unbind)
1190 list_for_each_entry(cdev, &thermal_cdev_list, node)
1191 tz->ops->unbind(tz, cdev);
1192 mutex_unlock(&thermal_list_lock);
1194 thermal_zone_device_set_polling(tz, 0);
1197 device_remove_file(&tz->device, &dev_attr_type);
1198 device_remove_file(&tz->device, &dev_attr_temp);
1199 if (tz->ops->get_mode)
1200 device_remove_file(&tz->device, &dev_attr_mode);
1202 for (count = 0; count < tz->trips; count++)
1203 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
1205 thermal_remove_hwmon_sysfs(tz);
1206 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1207 idr_destroy(&tz->idr);
1208 mutex_destroy(&tz->lock);
1209 device_unregister(&tz->device);
1213 EXPORT_SYMBOL(thermal_zone_device_unregister);
1216 static struct genl_family thermal_event_genl_family = {
1217 .id = GENL_ID_GENERATE,
1218 .name = THERMAL_GENL_FAMILY_NAME,
1219 .version = THERMAL_GENL_VERSION,
1220 .maxattr = THERMAL_GENL_ATTR_MAX,
1223 static struct genl_multicast_group thermal_event_mcgrp = {
1224 .name = THERMAL_GENL_MCAST_GROUP_NAME,
1227 int generate_netlink_event(u32 orig, enum events event)
1229 struct sk_buff *skb;
1230 struct nlattr *attr;
1231 struct thermal_genl_event *thermal_event;
1236 /* allocate memory */
1237 size = nla_total_size(sizeof(struct thermal_genl_event)) + \
1240 skb = genlmsg_new(size, GFP_ATOMIC);
1244 /* add the genetlink message header */
1245 msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1246 &thermal_event_genl_family, 0,
1247 THERMAL_GENL_CMD_EVENT);
1254 attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, \
1255 sizeof(struct thermal_genl_event));
1262 thermal_event = nla_data(attr);
1263 if (!thermal_event) {
1268 memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1270 thermal_event->orig = orig;
1271 thermal_event->event = event;
1273 /* send multicast genetlink message */
1274 result = genlmsg_end(skb, msg_header);
1280 result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1282 printk(KERN_INFO "failed to send netlink event:%d", result);
1286 EXPORT_SYMBOL(generate_netlink_event);
1288 static int genetlink_init(void)
1292 result = genl_register_family(&thermal_event_genl_family);
1296 result = genl_register_mc_group(&thermal_event_genl_family,
1297 &thermal_event_mcgrp);
1299 genl_unregister_family(&thermal_event_genl_family);
1303 static void genetlink_exit(void)
1305 genl_unregister_family(&thermal_event_genl_family);
1307 #else /* !CONFIG_NET */
1308 static inline int genetlink_init(void) { return 0; }
1309 static inline void genetlink_exit(void) {}
1310 #endif /* !CONFIG_NET */
1312 static int __init thermal_init(void)
1316 result = class_register(&thermal_class);
1318 idr_destroy(&thermal_tz_idr);
1319 idr_destroy(&thermal_cdev_idr);
1320 mutex_destroy(&thermal_idr_lock);
1321 mutex_destroy(&thermal_list_lock);
1323 result = genetlink_init();
1327 static void __exit thermal_exit(void)
1329 class_unregister(&thermal_class);
1330 idr_destroy(&thermal_tz_idr);
1331 idr_destroy(&thermal_cdev_idr);
1332 mutex_destroy(&thermal_idr_lock);
1333 mutex_destroy(&thermal_list_lock);
1337 fs_initcall(thermal_init);
1338 module_exit(thermal_exit);