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>
36 MODULE_AUTHOR("Zhang Rui");
37 MODULE_DESCRIPTION("Generic thermal management sysfs support");
38 MODULE_LICENSE("GPL");
40 #define PREFIX "Thermal: "
42 struct thermal_cooling_device_instance {
44 char name[THERMAL_NAME_LENGTH];
45 struct thermal_zone_device *tz;
46 struct thermal_cooling_device *cdev;
48 char attr_name[THERMAL_NAME_LENGTH];
49 struct device_attribute attr;
50 struct list_head node;
53 static DEFINE_IDR(thermal_tz_idr);
54 static DEFINE_IDR(thermal_cdev_idr);
55 static DEFINE_MUTEX(thermal_idr_lock);
57 static LIST_HEAD(thermal_tz_list);
58 static LIST_HEAD(thermal_cdev_list);
59 static DEFINE_MUTEX(thermal_list_lock);
61 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
66 if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
71 err = idr_get_new(idr, NULL, id);
74 if (unlikely(err == -EAGAIN))
76 else if (unlikely(err))
79 *id = *id & MAX_ID_MASK;
83 static void release_idr(struct idr *idr, struct mutex *lock, int id)
92 /* sys I/F for thermal zone */
94 #define to_thermal_zone(_dev) \
95 container_of(_dev, struct thermal_zone_device, device)
98 type_show(struct device *dev, struct device_attribute *attr, char *buf)
100 struct thermal_zone_device *tz = to_thermal_zone(dev);
102 return sprintf(buf, "%s\n", tz->type);
106 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
108 struct thermal_zone_device *tz = to_thermal_zone(dev);
112 if (!tz->ops->get_temp)
115 ret = tz->ops->get_temp(tz, &temperature);
120 return sprintf(buf, "%ld\n", temperature);
124 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
126 struct thermal_zone_device *tz = to_thermal_zone(dev);
127 enum thermal_device_mode mode;
130 if (!tz->ops->get_mode)
133 result = tz->ops->get_mode(tz, &mode);
137 return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
142 mode_store(struct device *dev, struct device_attribute *attr,
143 const char *buf, size_t count)
145 struct thermal_zone_device *tz = to_thermal_zone(dev);
148 if (!tz->ops->set_mode)
151 if (!strncmp(buf, "enabled", sizeof("enabled")))
152 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
153 else if (!strncmp(buf, "disabled", sizeof("disabled")))
154 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
165 trip_point_type_show(struct device *dev, struct device_attribute *attr,
168 struct thermal_zone_device *tz = to_thermal_zone(dev);
169 enum thermal_trip_type type;
172 if (!tz->ops->get_trip_type)
175 if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
178 result = tz->ops->get_trip_type(tz, trip, &type);
183 case THERMAL_TRIP_CRITICAL:
184 return sprintf(buf, "critical\n");
185 case THERMAL_TRIP_HOT:
186 return sprintf(buf, "hot\n");
187 case THERMAL_TRIP_PASSIVE:
188 return sprintf(buf, "passive\n");
189 case THERMAL_TRIP_ACTIVE:
190 return sprintf(buf, "active\n");
192 return sprintf(buf, "unknown\n");
197 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
200 struct thermal_zone_device *tz = to_thermal_zone(dev);
204 if (!tz->ops->get_trip_temp)
207 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
210 ret = tz->ops->get_trip_temp(tz, trip, &temperature);
215 return sprintf(buf, "%ld\n", temperature);
219 passive_store(struct device *dev, struct device_attribute *attr,
220 const char *buf, size_t count)
222 struct thermal_zone_device *tz = to_thermal_zone(dev);
223 struct thermal_cooling_device *cdev = NULL;
226 if (!sscanf(buf, "%d\n", &state))
229 /* sanity check: values below 1000 millicelcius don't make sense
230 * and can cause the system to go into a thermal heart attack
232 if (state && state < 1000)
235 if (state && !tz->forced_passive) {
236 mutex_lock(&thermal_list_lock);
237 list_for_each_entry(cdev, &thermal_cdev_list, node) {
238 if (!strncmp("Processor", cdev->type,
239 sizeof("Processor")))
240 thermal_zone_bind_cooling_device(tz,
244 mutex_unlock(&thermal_list_lock);
245 if (!tz->passive_delay)
246 tz->passive_delay = 1000;
247 } else if (!state && tz->forced_passive) {
248 mutex_lock(&thermal_list_lock);
249 list_for_each_entry(cdev, &thermal_cdev_list, node) {
250 if (!strncmp("Processor", cdev->type,
251 sizeof("Processor")))
252 thermal_zone_unbind_cooling_device(tz,
256 mutex_unlock(&thermal_list_lock);
257 tz->passive_delay = 0;
263 tz->forced_passive = state;
265 thermal_zone_device_update(tz);
271 passive_show(struct device *dev, struct device_attribute *attr,
274 struct thermal_zone_device *tz = to_thermal_zone(dev);
276 return sprintf(buf, "%d\n", tz->forced_passive);
279 static DEVICE_ATTR(type, 0444, type_show, NULL);
280 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
281 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
282 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, \
285 static struct device_attribute trip_point_attrs[] = {
286 __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
287 __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
288 __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
289 __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
290 __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
291 __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
292 __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
293 __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
294 __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
295 __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
296 __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
297 __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
298 __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
299 __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
300 __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
301 __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
302 __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
303 __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
304 __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
305 __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
306 __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
307 __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
308 __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
309 __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
312 #define TRIP_POINT_ATTR_ADD(_dev, _index, result) \
314 result = device_create_file(_dev, \
315 &trip_point_attrs[_index * 2]); \
318 result = device_create_file(_dev, \
319 &trip_point_attrs[_index * 2 + 1]); \
322 #define TRIP_POINT_ATTR_REMOVE(_dev, _index) \
324 device_remove_file(_dev, &trip_point_attrs[_index * 2]); \
325 device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]); \
328 /* sys I/F for cooling device */
329 #define to_cooling_device(_dev) \
330 container_of(_dev, struct thermal_cooling_device, device)
333 thermal_cooling_device_type_show(struct device *dev,
334 struct device_attribute *attr, char *buf)
336 struct thermal_cooling_device *cdev = to_cooling_device(dev);
338 return sprintf(buf, "%s\n", cdev->type);
342 thermal_cooling_device_max_state_show(struct device *dev,
343 struct device_attribute *attr, char *buf)
345 struct thermal_cooling_device *cdev = to_cooling_device(dev);
349 ret = cdev->ops->get_max_state(cdev, &state);
352 return sprintf(buf, "%ld\n", state);
356 thermal_cooling_device_cur_state_show(struct device *dev,
357 struct device_attribute *attr, char *buf)
359 struct thermal_cooling_device *cdev = to_cooling_device(dev);
363 ret = cdev->ops->get_cur_state(cdev, &state);
366 return sprintf(buf, "%ld\n", state);
370 thermal_cooling_device_cur_state_store(struct device *dev,
371 struct device_attribute *attr,
372 const char *buf, size_t count)
374 struct thermal_cooling_device *cdev = to_cooling_device(dev);
378 if (!sscanf(buf, "%ld\n", &state))
384 result = cdev->ops->set_cur_state(cdev, state);
390 static struct device_attribute dev_attr_cdev_type =
391 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
392 static DEVICE_ATTR(max_state, 0444,
393 thermal_cooling_device_max_state_show, NULL);
394 static DEVICE_ATTR(cur_state, 0644,
395 thermal_cooling_device_cur_state_show,
396 thermal_cooling_device_cur_state_store);
399 thermal_cooling_device_trip_point_show(struct device *dev,
400 struct device_attribute *attr, char *buf)
402 struct thermal_cooling_device_instance *instance;
405 container_of(attr, struct thermal_cooling_device_instance, attr);
407 if (instance->trip == THERMAL_TRIPS_NONE)
408 return sprintf(buf, "-1\n");
410 return sprintf(buf, "%d\n", instance->trip);
413 /* Device management */
415 #if defined(CONFIG_THERMAL_HWMON)
418 #include <linux/hwmon.h>
419 static LIST_HEAD(thermal_hwmon_list);
422 name_show(struct device *dev, struct device_attribute *attr, char *buf)
424 struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
425 return sprintf(buf, "%s\n", hwmon->type);
427 static DEVICE_ATTR(name, 0444, name_show, NULL);
430 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
434 struct thermal_hwmon_attr *hwmon_attr
435 = container_of(attr, struct thermal_hwmon_attr, attr);
436 struct thermal_zone_device *tz
437 = container_of(hwmon_attr, struct thermal_zone_device,
440 ret = tz->ops->get_temp(tz, &temperature);
445 return sprintf(buf, "%ld\n", temperature);
449 temp_crit_show(struct device *dev, struct device_attribute *attr,
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,
460 ret = tz->ops->get_trip_temp(tz, 0, &temperature);
464 return sprintf(buf, "%ld\n", temperature);
469 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
471 struct thermal_hwmon_device *hwmon;
472 int new_hwmon_device = 1;
475 mutex_lock(&thermal_list_lock);
476 list_for_each_entry(hwmon, &thermal_hwmon_list, node)
477 if (!strcmp(hwmon->type, tz->type)) {
478 new_hwmon_device = 0;
479 mutex_unlock(&thermal_list_lock);
480 goto register_sys_interface;
482 mutex_unlock(&thermal_list_lock);
484 hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
488 INIT_LIST_HEAD(&hwmon->tz_list);
489 strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
490 hwmon->device = hwmon_device_register(NULL);
491 if (IS_ERR(hwmon->device)) {
492 result = PTR_ERR(hwmon->device);
495 dev_set_drvdata(hwmon->device, hwmon);
496 result = device_create_file(hwmon->device, &dev_attr_name);
498 goto unregister_hwmon_device;
500 register_sys_interface:
504 snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH,
505 "temp%d_input", hwmon->count);
506 tz->temp_input.attr.attr.name = tz->temp_input.name;
507 tz->temp_input.attr.attr.mode = 0444;
508 tz->temp_input.attr.show = temp_input_show;
509 result = device_create_file(hwmon->device, &tz->temp_input.attr);
511 goto unregister_hwmon_device;
513 if (tz->ops->get_crit_temp) {
514 unsigned long temperature;
515 if (!tz->ops->get_crit_temp(tz, &temperature)) {
516 snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH,
517 "temp%d_crit", hwmon->count);
518 tz->temp_crit.attr.attr.name = tz->temp_crit.name;
519 tz->temp_crit.attr.attr.mode = 0444;
520 tz->temp_crit.attr.show = temp_crit_show;
521 result = device_create_file(hwmon->device,
522 &tz->temp_crit.attr);
524 goto unregister_hwmon_device;
528 mutex_lock(&thermal_list_lock);
529 if (new_hwmon_device)
530 list_add_tail(&hwmon->node, &thermal_hwmon_list);
531 list_add_tail(&tz->hwmon_node, &hwmon->tz_list);
532 mutex_unlock(&thermal_list_lock);
536 unregister_hwmon_device:
537 device_remove_file(hwmon->device, &tz->temp_crit.attr);
538 device_remove_file(hwmon->device, &tz->temp_input.attr);
539 if (new_hwmon_device) {
540 device_remove_file(hwmon->device, &dev_attr_name);
541 hwmon_device_unregister(hwmon->device);
544 if (new_hwmon_device)
551 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
553 struct thermal_hwmon_device *hwmon = tz->hwmon;
556 device_remove_file(hwmon->device, &tz->temp_input.attr);
557 device_remove_file(hwmon->device, &tz->temp_crit.attr);
559 mutex_lock(&thermal_list_lock);
560 list_del(&tz->hwmon_node);
561 if (!list_empty(&hwmon->tz_list)) {
562 mutex_unlock(&thermal_list_lock);
565 list_del(&hwmon->node);
566 mutex_unlock(&thermal_list_lock);
568 device_remove_file(hwmon->device, &dev_attr_name);
569 hwmon_device_unregister(hwmon->device);
574 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
580 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
585 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
588 cancel_delayed_work(&(tz->poll_queue));
594 schedule_delayed_work(&(tz->poll_queue),
595 round_jiffies(msecs_to_jiffies(delay)));
597 schedule_delayed_work(&(tz->poll_queue),
598 msecs_to_jiffies(delay));
601 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
602 int temp, int trip_temp, int trip)
605 struct thermal_cooling_device_instance *instance;
606 struct thermal_cooling_device *cdev;
607 long state, max_state;
612 * Calculate the thermal trend (using the passive cooling equation)
613 * and modify the performance limit for all passive cooling devices
614 * accordingly. Note that we assume symmetry.
616 if (temp >= trip_temp) {
619 trend = (tz->tc1 * (temp - tz->last_temperature)) +
620 (tz->tc2 * (temp - trip_temp));
624 list_for_each_entry(instance, &tz->cooling_devices,
626 if (instance->trip != trip)
628 cdev = instance->cdev;
629 cdev->ops->get_cur_state(cdev, &state);
630 cdev->ops->get_max_state(cdev, &max_state);
631 if (state++ < max_state)
632 cdev->ops->set_cur_state(cdev, state);
634 } else if (trend < 0) { /* Cooling off? */
635 list_for_each_entry(instance, &tz->cooling_devices,
637 if (instance->trip != trip)
639 cdev = instance->cdev;
640 cdev->ops->get_cur_state(cdev, &state);
641 cdev->ops->get_max_state(cdev, &max_state);
643 cdev->ops->set_cur_state(cdev, --state);
652 * Implement passive cooling hysteresis to slowly increase performance
653 * and avoid thrashing around the passive trip point. Note that we
656 list_for_each_entry(instance, &tz->cooling_devices, node) {
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);
669 static void thermal_zone_device_check(struct work_struct *work)
671 struct thermal_zone_device *tz = container_of(work, struct
674 thermal_zone_device_update(tz);
678 * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
679 * @tz: thermal zone device
680 * @trip: indicates which trip point the cooling devices is
681 * associated with in this thermal zone.
682 * @cdev: thermal cooling device
684 * This function is usually called in the thermal zone device .bind callback.
686 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
688 struct thermal_cooling_device *cdev)
690 struct thermal_cooling_device_instance *dev;
691 struct thermal_cooling_device_instance *pos;
692 struct thermal_zone_device *pos1;
693 struct thermal_cooling_device *pos2;
696 if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
699 list_for_each_entry(pos1, &thermal_tz_list, node) {
703 list_for_each_entry(pos2, &thermal_cdev_list, node) {
708 if (tz != pos1 || cdev != pos2)
712 kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
718 result = get_idr(&tz->idr, &tz->lock, &dev->id);
722 sprintf(dev->name, "cdev%d", dev->id);
724 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
728 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
729 dev->attr.attr.name = dev->attr_name;
730 dev->attr.attr.mode = 0444;
731 dev->attr.show = thermal_cooling_device_trip_point_show;
732 result = device_create_file(&tz->device, &dev->attr);
734 goto remove_symbol_link;
736 mutex_lock(&tz->lock);
737 list_for_each_entry(pos, &tz->cooling_devices, node)
738 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
743 list_add_tail(&dev->node, &tz->cooling_devices);
744 mutex_unlock(&tz->lock);
749 device_remove_file(&tz->device, &dev->attr);
751 sysfs_remove_link(&tz->device.kobj, dev->name);
753 release_idr(&tz->idr, &tz->lock, dev->id);
759 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
762 * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
763 * @tz: thermal zone device
764 * @trip: indicates which trip point the cooling devices is
765 * associated with in this thermal zone.
766 * @cdev: thermal cooling device
768 * This function is usually called in the thermal zone device .unbind callback.
770 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
772 struct thermal_cooling_device *cdev)
774 struct thermal_cooling_device_instance *pos, *next;
776 mutex_lock(&tz->lock);
777 list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
778 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
779 list_del(&pos->node);
780 mutex_unlock(&tz->lock);
784 mutex_unlock(&tz->lock);
789 device_remove_file(&tz->device, &pos->attr);
790 sysfs_remove_link(&tz->device.kobj, pos->name);
791 release_idr(&tz->idr, &tz->lock, pos->id);
796 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
798 static void thermal_release(struct device *dev)
800 struct thermal_zone_device *tz;
801 struct thermal_cooling_device *cdev;
803 if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
804 tz = to_thermal_zone(dev);
807 cdev = to_cooling_device(dev);
812 static struct class thermal_class = {
814 .dev_release = thermal_release,
818 * thermal_cooling_device_register - register a new thermal cooling device
819 * @type: the thermal cooling device type.
820 * @devdata: device private data.
821 * @ops: standard thermal cooling devices callbacks.
823 struct thermal_cooling_device *thermal_cooling_device_register(char *type,
826 thermal_cooling_device_ops
829 struct thermal_cooling_device *cdev;
830 struct thermal_zone_device *pos;
833 if (strlen(type) >= THERMAL_NAME_LENGTH)
834 return ERR_PTR(-EINVAL);
836 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
838 return ERR_PTR(-EINVAL);
840 cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
842 return ERR_PTR(-ENOMEM);
844 result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
847 return ERR_PTR(result);
850 strcpy(cdev->type, type);
852 cdev->device.class = &thermal_class;
853 cdev->devdata = devdata;
854 dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
855 result = device_register(&cdev->device);
857 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
859 return ERR_PTR(result);
864 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
869 result = device_create_file(&cdev->device, &dev_attr_max_state);
873 result = device_create_file(&cdev->device, &dev_attr_cur_state);
877 mutex_lock(&thermal_list_lock);
878 list_add(&cdev->node, &thermal_cdev_list);
879 list_for_each_entry(pos, &thermal_tz_list, node) {
882 result = pos->ops->bind(pos, cdev);
887 mutex_unlock(&thermal_list_lock);
893 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
894 device_unregister(&cdev->device);
895 return ERR_PTR(result);
898 EXPORT_SYMBOL(thermal_cooling_device_register);
901 * thermal_cooling_device_unregister - removes the registered thermal cooling device
902 * @cdev: the thermal cooling device to remove.
904 * thermal_cooling_device_unregister() must be called when the device is no
907 void thermal_cooling_device_unregister(struct
908 thermal_cooling_device
911 struct thermal_zone_device *tz;
912 struct thermal_cooling_device *pos = NULL;
917 mutex_lock(&thermal_list_lock);
918 list_for_each_entry(pos, &thermal_cdev_list, node)
922 /* thermal cooling device not found */
923 mutex_unlock(&thermal_list_lock);
926 list_del(&cdev->node);
927 list_for_each_entry(tz, &thermal_tz_list, node) {
928 if (!tz->ops->unbind)
930 tz->ops->unbind(tz, cdev);
932 mutex_unlock(&thermal_list_lock);
934 device_remove_file(&cdev->device, &dev_attr_cdev_type);
935 device_remove_file(&cdev->device, &dev_attr_max_state);
936 device_remove_file(&cdev->device, &dev_attr_cur_state);
938 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
939 device_unregister(&cdev->device);
943 EXPORT_SYMBOL(thermal_cooling_device_unregister);
946 * thermal_zone_device_update - force an update of a thermal zone's state
947 * @ttz: the thermal zone to update
950 void thermal_zone_device_update(struct thermal_zone_device *tz)
953 long temp, trip_temp;
954 enum thermal_trip_type trip_type;
955 struct thermal_cooling_device_instance *instance;
956 struct thermal_cooling_device *cdev;
958 mutex_lock(&tz->lock);
960 if (tz->ops->get_temp(tz, &temp)) {
961 /* get_temp failed - retry it later */
962 printk(KERN_WARNING PREFIX "failed to read out thermal zone "
967 for (count = 0; count < tz->trips; count++) {
968 tz->ops->get_trip_type(tz, count, &trip_type);
969 tz->ops->get_trip_temp(tz, count, &trip_temp);
972 case THERMAL_TRIP_CRITICAL:
973 if (temp >= trip_temp) {
975 ret = tz->ops->notify(tz, count,
979 "Critical temperature reached (%ld C), shutting down.\n",
981 orderly_poweroff(true);
985 case THERMAL_TRIP_HOT:
986 if (temp >= trip_temp)
988 tz->ops->notify(tz, count, trip_type);
990 case THERMAL_TRIP_ACTIVE:
991 list_for_each_entry(instance, &tz->cooling_devices,
993 if (instance->trip != count)
996 cdev = instance->cdev;
998 if (temp >= trip_temp)
999 cdev->ops->set_cur_state(cdev, 1);
1001 cdev->ops->set_cur_state(cdev, 0);
1004 case THERMAL_TRIP_PASSIVE:
1005 if (temp >= trip_temp || tz->passive)
1006 thermal_zone_device_passive(tz, temp,
1012 if (tz->forced_passive)
1013 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1014 THERMAL_TRIPS_NONE);
1016 tz->last_temperature = temp;
1020 thermal_zone_device_set_polling(tz, tz->passive_delay);
1021 else if (tz->polling_delay)
1022 thermal_zone_device_set_polling(tz, tz->polling_delay);
1024 thermal_zone_device_set_polling(tz, 0);
1025 mutex_unlock(&tz->lock);
1027 EXPORT_SYMBOL(thermal_zone_device_update);
1030 * thermal_zone_device_register - register a new thermal zone device
1031 * @type: the thermal zone device type
1032 * @trips: the number of trip points the thermal zone support
1033 * @devdata: private device data
1034 * @ops: standard thermal zone device callbacks
1035 * @tc1: thermal coefficient 1 for passive calculations
1036 * @tc2: thermal coefficient 2 for passive calculations
1037 * @passive_delay: number of milliseconds to wait between polls when
1038 * performing passive cooling
1039 * @polling_delay: number of milliseconds to wait between polls when checking
1040 * whether trip points have been crossed (0 for interrupt
1043 * thermal_zone_device_unregister() must be called when the device is no
1044 * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1045 * section 11.1.5.1 of the ACPI specification 3.0.
1047 struct thermal_zone_device *thermal_zone_device_register(char *type,
1049 void *devdata, struct
1050 thermal_zone_device_ops
1056 struct thermal_zone_device *tz;
1057 struct thermal_cooling_device *pos;
1058 enum thermal_trip_type trip_type;
1063 if (strlen(type) >= THERMAL_NAME_LENGTH)
1064 return ERR_PTR(-EINVAL);
1066 if (trips > THERMAL_MAX_TRIPS || trips < 0)
1067 return ERR_PTR(-EINVAL);
1069 if (!ops || !ops->get_temp)
1070 return ERR_PTR(-EINVAL);
1072 tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1074 return ERR_PTR(-ENOMEM);
1076 INIT_LIST_HEAD(&tz->cooling_devices);
1078 mutex_init(&tz->lock);
1079 result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1082 return ERR_PTR(result);
1085 strcpy(tz->type, type);
1087 tz->device.class = &thermal_class;
1088 tz->devdata = devdata;
1092 tz->passive_delay = passive_delay;
1093 tz->polling_delay = polling_delay;
1095 dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1096 result = device_register(&tz->device);
1098 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1100 return ERR_PTR(result);
1105 result = device_create_file(&tz->device, &dev_attr_type);
1110 result = device_create_file(&tz->device, &dev_attr_temp);
1114 if (ops->get_mode) {
1115 result = device_create_file(&tz->device, &dev_attr_mode);
1120 for (count = 0; count < trips; count++) {
1121 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
1124 tz->ops->get_trip_type(tz, count, &trip_type);
1125 if (trip_type == THERMAL_TRIP_PASSIVE)
1130 result = device_create_file(&tz->device,
1136 result = thermal_add_hwmon_sysfs(tz);
1140 mutex_lock(&thermal_list_lock);
1141 list_add_tail(&tz->node, &thermal_tz_list);
1143 list_for_each_entry(pos, &thermal_cdev_list, node) {
1144 result = ops->bind(tz, pos);
1148 mutex_unlock(&thermal_list_lock);
1150 INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1152 thermal_zone_device_update(tz);
1158 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1159 device_unregister(&tz->device);
1160 return ERR_PTR(result);
1163 EXPORT_SYMBOL(thermal_zone_device_register);
1166 * thermal_device_unregister - removes the registered thermal zone device
1167 * @tz: the thermal zone device to remove
1169 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1171 struct thermal_cooling_device *cdev;
1172 struct thermal_zone_device *pos = NULL;
1178 mutex_lock(&thermal_list_lock);
1179 list_for_each_entry(pos, &thermal_tz_list, node)
1183 /* thermal zone device not found */
1184 mutex_unlock(&thermal_list_lock);
1187 list_del(&tz->node);
1188 if (tz->ops->unbind)
1189 list_for_each_entry(cdev, &thermal_cdev_list, node)
1190 tz->ops->unbind(tz, cdev);
1191 mutex_unlock(&thermal_list_lock);
1193 thermal_zone_device_set_polling(tz, 0);
1196 device_remove_file(&tz->device, &dev_attr_type);
1197 device_remove_file(&tz->device, &dev_attr_temp);
1198 if (tz->ops->get_mode)
1199 device_remove_file(&tz->device, &dev_attr_mode);
1201 for (count = 0; count < tz->trips; count++)
1202 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
1204 thermal_remove_hwmon_sysfs(tz);
1205 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1206 idr_destroy(&tz->idr);
1207 mutex_destroy(&tz->lock);
1208 device_unregister(&tz->device);
1212 EXPORT_SYMBOL(thermal_zone_device_unregister);
1214 static int __init thermal_init(void)
1218 result = class_register(&thermal_class);
1220 idr_destroy(&thermal_tz_idr);
1221 idr_destroy(&thermal_cdev_idr);
1222 mutex_destroy(&thermal_idr_lock);
1223 mutex_destroy(&thermal_list_lock);
1228 static void __exit thermal_exit(void)
1230 class_unregister(&thermal_class);
1231 idr_destroy(&thermal_tz_idr);
1232 idr_destroy(&thermal_cdev_idr);
1233 mutex_destroy(&thermal_idr_lock);
1234 mutex_destroy(&thermal_list_lock);
1237 subsys_initcall(thermal_init);
1238 module_exit(thermal_exit);