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 struct genl_family thermal_event_genl_family = {
66 .id = GENL_ID_GENERATE,
67 .name = THERMAL_GENL_FAMILY_NAME,
68 .version = THERMAL_GENL_VERSION,
69 .maxattr = THERMAL_GENL_ATTR_MAX,
72 static struct genl_multicast_group thermal_event_mcgrp = {
73 .name = THERMAL_GENL_MCAST_GROUP_NAME,
76 static int genetlink_init(void);
77 static void genetlink_exit(void);
79 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
84 if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
89 err = idr_get_new(idr, NULL, id);
92 if (unlikely(err == -EAGAIN))
94 else if (unlikely(err))
97 *id = *id & MAX_ID_MASK;
101 static void release_idr(struct idr *idr, struct mutex *lock, int id)
110 /* sys I/F for thermal zone */
112 #define to_thermal_zone(_dev) \
113 container_of(_dev, struct thermal_zone_device, device)
116 type_show(struct device *dev, struct device_attribute *attr, char *buf)
118 struct thermal_zone_device *tz = to_thermal_zone(dev);
120 return sprintf(buf, "%s\n", tz->type);
124 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
126 struct thermal_zone_device *tz = to_thermal_zone(dev);
130 if (!tz->ops->get_temp)
133 ret = tz->ops->get_temp(tz, &temperature);
138 return sprintf(buf, "%ld\n", temperature);
142 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
144 struct thermal_zone_device *tz = to_thermal_zone(dev);
145 enum thermal_device_mode mode;
148 if (!tz->ops->get_mode)
151 result = tz->ops->get_mode(tz, &mode);
155 return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
160 mode_store(struct device *dev, struct device_attribute *attr,
161 const char *buf, size_t count)
163 struct thermal_zone_device *tz = to_thermal_zone(dev);
166 if (!tz->ops->set_mode)
169 if (!strncmp(buf, "enabled", sizeof("enabled")))
170 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
171 else if (!strncmp(buf, "disabled", sizeof("disabled")))
172 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
183 trip_point_type_show(struct device *dev, struct device_attribute *attr,
186 struct thermal_zone_device *tz = to_thermal_zone(dev);
187 enum thermal_trip_type type;
190 if (!tz->ops->get_trip_type)
193 if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
196 result = tz->ops->get_trip_type(tz, trip, &type);
201 case THERMAL_TRIP_CRITICAL:
202 return sprintf(buf, "critical\n");
203 case THERMAL_TRIP_HOT:
204 return sprintf(buf, "hot\n");
205 case THERMAL_TRIP_PASSIVE:
206 return sprintf(buf, "passive\n");
207 case THERMAL_TRIP_ACTIVE:
208 return sprintf(buf, "active\n");
210 return sprintf(buf, "unknown\n");
215 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
218 struct thermal_zone_device *tz = to_thermal_zone(dev);
222 if (!tz->ops->get_trip_temp)
225 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
228 ret = tz->ops->get_trip_temp(tz, trip, &temperature);
233 return sprintf(buf, "%ld\n", temperature);
237 passive_store(struct device *dev, struct device_attribute *attr,
238 const char *buf, size_t count)
240 struct thermal_zone_device *tz = to_thermal_zone(dev);
241 struct thermal_cooling_device *cdev = NULL;
244 if (!sscanf(buf, "%d\n", &state))
247 /* sanity check: values below 1000 millicelcius don't make sense
248 * and can cause the system to go into a thermal heart attack
250 if (state && state < 1000)
253 if (state && !tz->forced_passive) {
254 mutex_lock(&thermal_list_lock);
255 list_for_each_entry(cdev, &thermal_cdev_list, node) {
256 if (!strncmp("Processor", cdev->type,
257 sizeof("Processor")))
258 thermal_zone_bind_cooling_device(tz,
262 mutex_unlock(&thermal_list_lock);
263 if (!tz->passive_delay)
264 tz->passive_delay = 1000;
265 } else if (!state && tz->forced_passive) {
266 mutex_lock(&thermal_list_lock);
267 list_for_each_entry(cdev, &thermal_cdev_list, node) {
268 if (!strncmp("Processor", cdev->type,
269 sizeof("Processor")))
270 thermal_zone_unbind_cooling_device(tz,
274 mutex_unlock(&thermal_list_lock);
275 tz->passive_delay = 0;
281 tz->forced_passive = state;
283 thermal_zone_device_update(tz);
289 passive_show(struct device *dev, struct device_attribute *attr,
292 struct thermal_zone_device *tz = to_thermal_zone(dev);
294 return sprintf(buf, "%d\n", tz->forced_passive);
297 static DEVICE_ATTR(type, 0444, type_show, NULL);
298 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
299 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
300 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, \
303 static struct device_attribute trip_point_attrs[] = {
304 __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
305 __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
306 __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
307 __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
308 __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
309 __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
310 __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
311 __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
312 __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
313 __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
314 __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
315 __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
316 __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
317 __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
318 __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
319 __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
320 __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
321 __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
322 __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
323 __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
324 __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
325 __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
326 __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
327 __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
330 #define TRIP_POINT_ATTR_ADD(_dev, _index, result) \
332 result = device_create_file(_dev, \
333 &trip_point_attrs[_index * 2]); \
336 result = device_create_file(_dev, \
337 &trip_point_attrs[_index * 2 + 1]); \
340 #define TRIP_POINT_ATTR_REMOVE(_dev, _index) \
342 device_remove_file(_dev, &trip_point_attrs[_index * 2]); \
343 device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]); \
346 /* sys I/F for cooling device */
347 #define to_cooling_device(_dev) \
348 container_of(_dev, struct thermal_cooling_device, device)
351 thermal_cooling_device_type_show(struct device *dev,
352 struct device_attribute *attr, char *buf)
354 struct thermal_cooling_device *cdev = to_cooling_device(dev);
356 return sprintf(buf, "%s\n", cdev->type);
360 thermal_cooling_device_max_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_max_state(cdev, &state);
370 return sprintf(buf, "%ld\n", state);
374 thermal_cooling_device_cur_state_show(struct device *dev,
375 struct device_attribute *attr, char *buf)
377 struct thermal_cooling_device *cdev = to_cooling_device(dev);
381 ret = cdev->ops->get_cur_state(cdev, &state);
384 return sprintf(buf, "%ld\n", state);
388 thermal_cooling_device_cur_state_store(struct device *dev,
389 struct device_attribute *attr,
390 const char *buf, size_t count)
392 struct thermal_cooling_device *cdev = to_cooling_device(dev);
396 if (!sscanf(buf, "%ld\n", &state))
402 result = cdev->ops->set_cur_state(cdev, state);
408 static struct device_attribute dev_attr_cdev_type =
409 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
410 static DEVICE_ATTR(max_state, 0444,
411 thermal_cooling_device_max_state_show, NULL);
412 static DEVICE_ATTR(cur_state, 0644,
413 thermal_cooling_device_cur_state_show,
414 thermal_cooling_device_cur_state_store);
417 thermal_cooling_device_trip_point_show(struct device *dev,
418 struct device_attribute *attr, char *buf)
420 struct thermal_cooling_device_instance *instance;
423 container_of(attr, struct thermal_cooling_device_instance, attr);
425 if (instance->trip == THERMAL_TRIPS_NONE)
426 return sprintf(buf, "-1\n");
428 return sprintf(buf, "%d\n", instance->trip);
431 /* Device management */
433 #if defined(CONFIG_THERMAL_HWMON)
436 #include <linux/hwmon.h>
437 static LIST_HEAD(thermal_hwmon_list);
440 name_show(struct device *dev, struct device_attribute *attr, char *buf)
442 struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
443 return sprintf(buf, "%s\n", hwmon->type);
445 static DEVICE_ATTR(name, 0444, name_show, NULL);
448 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
452 struct thermal_hwmon_attr *hwmon_attr
453 = container_of(attr, struct thermal_hwmon_attr, attr);
454 struct thermal_zone_device *tz
455 = container_of(hwmon_attr, struct thermal_zone_device,
458 ret = tz->ops->get_temp(tz, &temperature);
463 return sprintf(buf, "%ld\n", temperature);
467 temp_crit_show(struct device *dev, struct device_attribute *attr,
470 struct thermal_hwmon_attr *hwmon_attr
471 = container_of(attr, struct thermal_hwmon_attr, attr);
472 struct thermal_zone_device *tz
473 = container_of(hwmon_attr, struct thermal_zone_device,
478 ret = tz->ops->get_trip_temp(tz, 0, &temperature);
482 return sprintf(buf, "%ld\n", temperature);
487 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
489 struct thermal_hwmon_device *hwmon;
490 int new_hwmon_device = 1;
493 mutex_lock(&thermal_list_lock);
494 list_for_each_entry(hwmon, &thermal_hwmon_list, node)
495 if (!strcmp(hwmon->type, tz->type)) {
496 new_hwmon_device = 0;
497 mutex_unlock(&thermal_list_lock);
498 goto register_sys_interface;
500 mutex_unlock(&thermal_list_lock);
502 hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
506 INIT_LIST_HEAD(&hwmon->tz_list);
507 strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
508 hwmon->device = hwmon_device_register(NULL);
509 if (IS_ERR(hwmon->device)) {
510 result = PTR_ERR(hwmon->device);
513 dev_set_drvdata(hwmon->device, hwmon);
514 result = device_create_file(hwmon->device, &dev_attr_name);
516 goto unregister_hwmon_device;
518 register_sys_interface:
522 snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH,
523 "temp%d_input", hwmon->count);
524 tz->temp_input.attr.attr.name = tz->temp_input.name;
525 tz->temp_input.attr.attr.mode = 0444;
526 tz->temp_input.attr.show = temp_input_show;
527 sysfs_attr_init(&tz->temp_input.attr.attr);
528 result = device_create_file(hwmon->device, &tz->temp_input.attr);
530 goto unregister_hwmon_device;
532 if (tz->ops->get_crit_temp) {
533 unsigned long temperature;
534 if (!tz->ops->get_crit_temp(tz, &temperature)) {
535 snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH,
536 "temp%d_crit", hwmon->count);
537 tz->temp_crit.attr.attr.name = tz->temp_crit.name;
538 tz->temp_crit.attr.attr.mode = 0444;
539 tz->temp_crit.attr.show = temp_crit_show;
540 sysfs_attr_init(&tz->temp_crit.attr.attr);
541 result = device_create_file(hwmon->device,
542 &tz->temp_crit.attr);
544 goto unregister_hwmon_device;
548 mutex_lock(&thermal_list_lock);
549 if (new_hwmon_device)
550 list_add_tail(&hwmon->node, &thermal_hwmon_list);
551 list_add_tail(&tz->hwmon_node, &hwmon->tz_list);
552 mutex_unlock(&thermal_list_lock);
556 unregister_hwmon_device:
557 device_remove_file(hwmon->device, &tz->temp_crit.attr);
558 device_remove_file(hwmon->device, &tz->temp_input.attr);
559 if (new_hwmon_device) {
560 device_remove_file(hwmon->device, &dev_attr_name);
561 hwmon_device_unregister(hwmon->device);
564 if (new_hwmon_device)
571 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
573 struct thermal_hwmon_device *hwmon = tz->hwmon;
576 device_remove_file(hwmon->device, &tz->temp_input.attr);
577 device_remove_file(hwmon->device, &tz->temp_crit.attr);
579 mutex_lock(&thermal_list_lock);
580 list_del(&tz->hwmon_node);
581 if (!list_empty(&hwmon->tz_list)) {
582 mutex_unlock(&thermal_list_lock);
585 list_del(&hwmon->node);
586 mutex_unlock(&thermal_list_lock);
588 device_remove_file(hwmon->device, &dev_attr_name);
589 hwmon_device_unregister(hwmon->device);
594 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
600 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
605 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
608 cancel_delayed_work(&(tz->poll_queue));
614 schedule_delayed_work(&(tz->poll_queue),
615 round_jiffies(msecs_to_jiffies(delay)));
617 schedule_delayed_work(&(tz->poll_queue),
618 msecs_to_jiffies(delay));
621 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
622 int temp, int trip_temp, int trip)
625 struct thermal_cooling_device_instance *instance;
626 struct thermal_cooling_device *cdev;
627 long state, max_state;
632 * Calculate the thermal trend (using the passive cooling equation)
633 * and modify the performance limit for all passive cooling devices
634 * accordingly. Note that we assume symmetry.
636 if (temp >= trip_temp) {
639 trend = (tz->tc1 * (temp - tz->last_temperature)) +
640 (tz->tc2 * (temp - trip_temp));
644 list_for_each_entry(instance, &tz->cooling_devices,
646 if (instance->trip != trip)
648 cdev = instance->cdev;
649 cdev->ops->get_cur_state(cdev, &state);
650 cdev->ops->get_max_state(cdev, &max_state);
651 if (state++ < max_state)
652 cdev->ops->set_cur_state(cdev, state);
654 } else if (trend < 0) { /* Cooling off? */
655 list_for_each_entry(instance, &tz->cooling_devices,
657 if (instance->trip != trip)
659 cdev = instance->cdev;
660 cdev->ops->get_cur_state(cdev, &state);
661 cdev->ops->get_max_state(cdev, &max_state);
663 cdev->ops->set_cur_state(cdev, --state);
672 * Implement passive cooling hysteresis to slowly increase performance
673 * and avoid thrashing around the passive trip point. Note that we
676 list_for_each_entry(instance, &tz->cooling_devices, node) {
677 if (instance->trip != trip)
679 cdev = instance->cdev;
680 cdev->ops->get_cur_state(cdev, &state);
681 cdev->ops->get_max_state(cdev, &max_state);
683 cdev->ops->set_cur_state(cdev, --state);
689 static void thermal_zone_device_check(struct work_struct *work)
691 struct thermal_zone_device *tz = container_of(work, struct
694 thermal_zone_device_update(tz);
698 * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
699 * @tz: thermal zone device
700 * @trip: indicates which trip point the cooling devices is
701 * associated with in this thermal zone.
702 * @cdev: thermal cooling device
704 * This function is usually called in the thermal zone device .bind callback.
706 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
708 struct thermal_cooling_device *cdev)
710 struct thermal_cooling_device_instance *dev;
711 struct thermal_cooling_device_instance *pos;
712 struct thermal_zone_device *pos1;
713 struct thermal_cooling_device *pos2;
716 if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
719 list_for_each_entry(pos1, &thermal_tz_list, node) {
723 list_for_each_entry(pos2, &thermal_cdev_list, node) {
728 if (tz != pos1 || cdev != pos2)
732 kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
738 result = get_idr(&tz->idr, &tz->lock, &dev->id);
742 sprintf(dev->name, "cdev%d", dev->id);
744 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
748 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
749 sysfs_attr_init(&dev->attr.attr);
750 dev->attr.attr.name = dev->attr_name;
751 dev->attr.attr.mode = 0444;
752 dev->attr.show = thermal_cooling_device_trip_point_show;
753 result = device_create_file(&tz->device, &dev->attr);
755 goto remove_symbol_link;
757 mutex_lock(&tz->lock);
758 list_for_each_entry(pos, &tz->cooling_devices, node)
759 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
764 list_add_tail(&dev->node, &tz->cooling_devices);
765 mutex_unlock(&tz->lock);
770 device_remove_file(&tz->device, &dev->attr);
772 sysfs_remove_link(&tz->device.kobj, dev->name);
774 release_idr(&tz->idr, &tz->lock, dev->id);
780 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
783 * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
784 * @tz: thermal zone device
785 * @trip: indicates which trip point the cooling devices is
786 * associated with in this thermal zone.
787 * @cdev: thermal cooling device
789 * This function is usually called in the thermal zone device .unbind callback.
791 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
793 struct thermal_cooling_device *cdev)
795 struct thermal_cooling_device_instance *pos, *next;
797 mutex_lock(&tz->lock);
798 list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
799 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
800 list_del(&pos->node);
801 mutex_unlock(&tz->lock);
805 mutex_unlock(&tz->lock);
810 device_remove_file(&tz->device, &pos->attr);
811 sysfs_remove_link(&tz->device.kobj, pos->name);
812 release_idr(&tz->idr, &tz->lock, pos->id);
817 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
819 static void thermal_release(struct device *dev)
821 struct thermal_zone_device *tz;
822 struct thermal_cooling_device *cdev;
824 if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
825 tz = to_thermal_zone(dev);
828 cdev = to_cooling_device(dev);
833 static struct class thermal_class = {
835 .dev_release = thermal_release,
839 * thermal_cooling_device_register - register a new thermal cooling device
840 * @type: the thermal cooling device type.
841 * @devdata: device private data.
842 * @ops: standard thermal cooling devices callbacks.
844 struct thermal_cooling_device *thermal_cooling_device_register(char *type,
847 thermal_cooling_device_ops
850 struct thermal_cooling_device *cdev;
851 struct thermal_zone_device *pos;
854 if (strlen(type) >= THERMAL_NAME_LENGTH)
855 return ERR_PTR(-EINVAL);
857 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
859 return ERR_PTR(-EINVAL);
861 cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
863 return ERR_PTR(-ENOMEM);
865 result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
868 return ERR_PTR(result);
871 strcpy(cdev->type, type);
873 cdev->device.class = &thermal_class;
874 cdev->devdata = devdata;
875 dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
876 result = device_register(&cdev->device);
878 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
880 return ERR_PTR(result);
885 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
890 result = device_create_file(&cdev->device, &dev_attr_max_state);
894 result = device_create_file(&cdev->device, &dev_attr_cur_state);
898 mutex_lock(&thermal_list_lock);
899 list_add(&cdev->node, &thermal_cdev_list);
900 list_for_each_entry(pos, &thermal_tz_list, node) {
903 result = pos->ops->bind(pos, cdev);
908 mutex_unlock(&thermal_list_lock);
914 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
915 device_unregister(&cdev->device);
916 return ERR_PTR(result);
919 EXPORT_SYMBOL(thermal_cooling_device_register);
922 * thermal_cooling_device_unregister - removes the registered thermal cooling device
923 * @cdev: the thermal cooling device to remove.
925 * thermal_cooling_device_unregister() must be called when the device is no
928 void thermal_cooling_device_unregister(struct
929 thermal_cooling_device
932 struct thermal_zone_device *tz;
933 struct thermal_cooling_device *pos = NULL;
938 mutex_lock(&thermal_list_lock);
939 list_for_each_entry(pos, &thermal_cdev_list, node)
943 /* thermal cooling device not found */
944 mutex_unlock(&thermal_list_lock);
947 list_del(&cdev->node);
948 list_for_each_entry(tz, &thermal_tz_list, node) {
949 if (!tz->ops->unbind)
951 tz->ops->unbind(tz, cdev);
953 mutex_unlock(&thermal_list_lock);
955 device_remove_file(&cdev->device, &dev_attr_cdev_type);
956 device_remove_file(&cdev->device, &dev_attr_max_state);
957 device_remove_file(&cdev->device, &dev_attr_cur_state);
959 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
960 device_unregister(&cdev->device);
964 EXPORT_SYMBOL(thermal_cooling_device_unregister);
967 * thermal_zone_device_update - force an update of a thermal zone's state
968 * @ttz: the thermal zone to update
971 void thermal_zone_device_update(struct thermal_zone_device *tz)
974 long temp, trip_temp;
975 enum thermal_trip_type trip_type;
976 struct thermal_cooling_device_instance *instance;
977 struct thermal_cooling_device *cdev;
979 mutex_lock(&tz->lock);
981 if (tz->ops->get_temp(tz, &temp)) {
982 /* get_temp failed - retry it later */
983 printk(KERN_WARNING PREFIX "failed to read out thermal zone "
988 for (count = 0; count < tz->trips; count++) {
989 tz->ops->get_trip_type(tz, count, &trip_type);
990 tz->ops->get_trip_temp(tz, count, &trip_temp);
993 case THERMAL_TRIP_CRITICAL:
994 if (temp >= trip_temp) {
996 ret = tz->ops->notify(tz, count,
1000 "Critical temperature reached (%ld C), shutting down.\n",
1002 orderly_poweroff(true);
1006 case THERMAL_TRIP_HOT:
1007 if (temp >= trip_temp)
1008 if (tz->ops->notify)
1009 tz->ops->notify(tz, count, trip_type);
1011 case THERMAL_TRIP_ACTIVE:
1012 list_for_each_entry(instance, &tz->cooling_devices,
1014 if (instance->trip != count)
1017 cdev = instance->cdev;
1019 if (temp >= trip_temp)
1020 cdev->ops->set_cur_state(cdev, 1);
1022 cdev->ops->set_cur_state(cdev, 0);
1025 case THERMAL_TRIP_PASSIVE:
1026 if (temp >= trip_temp || tz->passive)
1027 thermal_zone_device_passive(tz, temp,
1033 if (tz->forced_passive)
1034 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1035 THERMAL_TRIPS_NONE);
1037 tz->last_temperature = temp;
1041 thermal_zone_device_set_polling(tz, tz->passive_delay);
1042 else if (tz->polling_delay)
1043 thermal_zone_device_set_polling(tz, tz->polling_delay);
1045 thermal_zone_device_set_polling(tz, 0);
1046 mutex_unlock(&tz->lock);
1048 EXPORT_SYMBOL(thermal_zone_device_update);
1051 * thermal_zone_device_register - register a new thermal zone device
1052 * @type: the thermal zone device type
1053 * @trips: the number of trip points the thermal zone support
1054 * @devdata: private device data
1055 * @ops: standard thermal zone device callbacks
1056 * @tc1: thermal coefficient 1 for passive calculations
1057 * @tc2: thermal coefficient 2 for passive calculations
1058 * @passive_delay: number of milliseconds to wait between polls when
1059 * performing passive cooling
1060 * @polling_delay: number of milliseconds to wait between polls when checking
1061 * whether trip points have been crossed (0 for interrupt
1064 * thermal_zone_device_unregister() must be called when the device is no
1065 * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1066 * section 11.1.5.1 of the ACPI specification 3.0.
1068 struct thermal_zone_device *thermal_zone_device_register(char *type,
1070 void *devdata, struct
1071 thermal_zone_device_ops
1077 struct thermal_zone_device *tz;
1078 struct thermal_cooling_device *pos;
1079 enum thermal_trip_type trip_type;
1084 if (strlen(type) >= THERMAL_NAME_LENGTH)
1085 return ERR_PTR(-EINVAL);
1087 if (trips > THERMAL_MAX_TRIPS || trips < 0)
1088 return ERR_PTR(-EINVAL);
1090 if (!ops || !ops->get_temp)
1091 return ERR_PTR(-EINVAL);
1093 tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1095 return ERR_PTR(-ENOMEM);
1097 INIT_LIST_HEAD(&tz->cooling_devices);
1099 mutex_init(&tz->lock);
1100 result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1103 return ERR_PTR(result);
1106 strcpy(tz->type, type);
1108 tz->device.class = &thermal_class;
1109 tz->devdata = devdata;
1113 tz->passive_delay = passive_delay;
1114 tz->polling_delay = polling_delay;
1116 dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1117 result = device_register(&tz->device);
1119 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1121 return ERR_PTR(result);
1126 result = device_create_file(&tz->device, &dev_attr_type);
1131 result = device_create_file(&tz->device, &dev_attr_temp);
1135 if (ops->get_mode) {
1136 result = device_create_file(&tz->device, &dev_attr_mode);
1141 for (count = 0; count < trips; count++) {
1142 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
1145 tz->ops->get_trip_type(tz, count, &trip_type);
1146 if (trip_type == THERMAL_TRIP_PASSIVE)
1151 result = device_create_file(&tz->device,
1157 result = thermal_add_hwmon_sysfs(tz);
1161 mutex_lock(&thermal_list_lock);
1162 list_add_tail(&tz->node, &thermal_tz_list);
1164 list_for_each_entry(pos, &thermal_cdev_list, node) {
1165 result = ops->bind(tz, pos);
1169 mutex_unlock(&thermal_list_lock);
1171 INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1173 thermal_zone_device_update(tz);
1179 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1180 device_unregister(&tz->device);
1181 return ERR_PTR(result);
1184 EXPORT_SYMBOL(thermal_zone_device_register);
1187 * thermal_device_unregister - removes the registered thermal zone device
1188 * @tz: the thermal zone device to remove
1190 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1192 struct thermal_cooling_device *cdev;
1193 struct thermal_zone_device *pos = NULL;
1199 mutex_lock(&thermal_list_lock);
1200 list_for_each_entry(pos, &thermal_tz_list, node)
1204 /* thermal zone device not found */
1205 mutex_unlock(&thermal_list_lock);
1208 list_del(&tz->node);
1209 if (tz->ops->unbind)
1210 list_for_each_entry(cdev, &thermal_cdev_list, node)
1211 tz->ops->unbind(tz, cdev);
1212 mutex_unlock(&thermal_list_lock);
1214 thermal_zone_device_set_polling(tz, 0);
1217 device_remove_file(&tz->device, &dev_attr_type);
1218 device_remove_file(&tz->device, &dev_attr_temp);
1219 if (tz->ops->get_mode)
1220 device_remove_file(&tz->device, &dev_attr_mode);
1222 for (count = 0; count < tz->trips; count++)
1223 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
1225 thermal_remove_hwmon_sysfs(tz);
1226 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1227 idr_destroy(&tz->idr);
1228 mutex_destroy(&tz->lock);
1229 device_unregister(&tz->device);
1233 EXPORT_SYMBOL(thermal_zone_device_unregister);
1235 int generate_netlink_event(u32 orig, enum events event)
1237 struct sk_buff *skb;
1238 struct nlattr *attr;
1239 struct thermal_genl_event *thermal_event;
1244 /* allocate memory */
1245 size = nla_total_size(sizeof(struct thermal_genl_event)) + \
1248 skb = genlmsg_new(size, GFP_ATOMIC);
1252 /* add the genetlink message header */
1253 msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1254 &thermal_event_genl_family, 0,
1255 THERMAL_GENL_CMD_EVENT);
1262 attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, \
1263 sizeof(struct thermal_genl_event));
1270 thermal_event = nla_data(attr);
1271 if (!thermal_event) {
1276 memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1278 thermal_event->orig = orig;
1279 thermal_event->event = event;
1281 /* send multicast genetlink message */
1282 result = genlmsg_end(skb, msg_header);
1288 result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1290 printk(KERN_INFO "failed to send netlink event:%d", result);
1294 EXPORT_SYMBOL(generate_netlink_event);
1296 static int genetlink_init(void)
1300 result = genl_register_family(&thermal_event_genl_family);
1304 result = genl_register_mc_group(&thermal_event_genl_family,
1305 &thermal_event_mcgrp);
1307 genl_unregister_family(&thermal_event_genl_family);
1311 static int __init thermal_init(void)
1315 result = class_register(&thermal_class);
1317 idr_destroy(&thermal_tz_idr);
1318 idr_destroy(&thermal_cdev_idr);
1319 mutex_destroy(&thermal_idr_lock);
1320 mutex_destroy(&thermal_list_lock);
1322 result = genetlink_init();
1326 static void genetlink_exit(void)
1328 genl_unregister_family(&thermal_event_genl_family);
1331 static void __exit thermal_exit(void)
1333 class_unregister(&thermal_class);
1334 idr_destroy(&thermal_tz_idr);
1335 idr_destroy(&thermal_cdev_idr);
1336 mutex_destroy(&thermal_idr_lock);
1337 mutex_destroy(&thermal_list_lock);
1341 fs_initcall(thermal_init);
1342 module_exit(thermal_exit);