2 * thermal.c - Generic Thermal Management Sysfs support.
4 * Copyright (C) 2008 Intel Corp
5 * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
6 * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2 of the License.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
28 #include <linux/module.h>
29 #include <linux/device.h>
30 #include <linux/err.h>
31 #include <linux/slab.h>
32 #include <linux/kdev_t.h>
33 #include <linux/idr.h>
34 #include <linux/thermal.h>
35 #include <linux/spinlock.h>
36 #include <linux/reboot.h>
37 #include <net/netlink.h>
38 #include <net/genetlink.h>
40 MODULE_AUTHOR("Zhang Rui");
41 MODULE_DESCRIPTION("Generic thermal management sysfs support");
42 MODULE_LICENSE("GPL");
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 int get_idr(struct idr
*idr
, struct mutex
*lock
, int *id
)
68 if (unlikely(idr_pre_get(idr
, GFP_KERNEL
) == 0))
73 err
= idr_get_new(idr
, NULL
, id
);
76 if (unlikely(err
== -EAGAIN
))
78 else if (unlikely(err
))
81 *id
= *id
& MAX_IDR_MASK
;
85 static void release_idr(struct idr
*idr
, struct mutex
*lock
, int id
)
94 /* sys I/F for thermal zone */
96 #define to_thermal_zone(_dev) \
97 container_of(_dev, struct thermal_zone_device, device)
100 type_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
102 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
104 return sprintf(buf
, "%s\n", tz
->type
);
108 temp_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
110 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
114 if (!tz
->ops
->get_temp
)
117 ret
= tz
->ops
->get_temp(tz
, &temperature
);
122 return sprintf(buf
, "%ld\n", temperature
);
126 mode_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
128 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
129 enum thermal_device_mode mode
;
132 if (!tz
->ops
->get_mode
)
135 result
= tz
->ops
->get_mode(tz
, &mode
);
139 return sprintf(buf
, "%s\n", mode
== THERMAL_DEVICE_ENABLED
? "enabled"
144 mode_store(struct device
*dev
, struct device_attribute
*attr
,
145 const char *buf
, size_t count
)
147 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
150 if (!tz
->ops
->set_mode
)
153 if (!strncmp(buf
, "enabled", sizeof("enabled") - 1))
154 result
= tz
->ops
->set_mode(tz
, THERMAL_DEVICE_ENABLED
);
155 else if (!strncmp(buf
, "disabled", sizeof("disabled") - 1))
156 result
= tz
->ops
->set_mode(tz
, THERMAL_DEVICE_DISABLED
);
167 trip_point_type_show(struct device
*dev
, struct device_attribute
*attr
,
170 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
171 enum thermal_trip_type type
;
174 if (!tz
->ops
->get_trip_type
)
177 if (!sscanf(attr
->attr
.name
, "trip_point_%d_type", &trip
))
180 result
= tz
->ops
->get_trip_type(tz
, trip
, &type
);
185 case THERMAL_TRIP_CRITICAL
:
186 return sprintf(buf
, "critical\n");
187 case THERMAL_TRIP_HOT
:
188 return sprintf(buf
, "hot\n");
189 case THERMAL_TRIP_PASSIVE
:
190 return sprintf(buf
, "passive\n");
191 case THERMAL_TRIP_ACTIVE
:
192 return sprintf(buf
, "active\n");
194 return sprintf(buf
, "unknown\n");
199 trip_point_temp_store(struct device
*dev
, struct device_attribute
*attr
,
200 const char *buf
, size_t count
)
202 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
204 unsigned long temperature
;
206 if (!tz
->ops
->set_trip_temp
)
209 if (!sscanf(attr
->attr
.name
, "trip_point_%d_temp", &trip
))
212 if (kstrtoul(buf
, 10, &temperature
))
215 ret
= tz
->ops
->set_trip_temp(tz
, trip
, temperature
);
217 return ret
? ret
: count
;
221 trip_point_temp_show(struct device
*dev
, struct device_attribute
*attr
,
224 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
228 if (!tz
->ops
->get_trip_temp
)
231 if (!sscanf(attr
->attr
.name
, "trip_point_%d_temp", &trip
))
234 ret
= tz
->ops
->get_trip_temp(tz
, trip
, &temperature
);
239 return sprintf(buf
, "%ld\n", temperature
);
243 trip_point_hyst_store(struct device
*dev
, struct device_attribute
*attr
,
244 const char *buf
, size_t count
)
246 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
248 unsigned long temperature
;
250 if (!tz
->ops
->set_trip_hyst
)
253 if (!sscanf(attr
->attr
.name
, "trip_point_%d_hyst", &trip
))
256 if (kstrtoul(buf
, 10, &temperature
))
260 * We are not doing any check on the 'temperature' value
261 * here. The driver implementing 'set_trip_hyst' has to
264 ret
= tz
->ops
->set_trip_hyst(tz
, trip
, temperature
);
266 return ret
? ret
: count
;
270 trip_point_hyst_show(struct device
*dev
, struct device_attribute
*attr
,
273 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
275 unsigned long temperature
;
277 if (!tz
->ops
->get_trip_hyst
)
280 if (!sscanf(attr
->attr
.name
, "trip_point_%d_hyst", &trip
))
283 ret
= tz
->ops
->get_trip_hyst(tz
, trip
, &temperature
);
285 return ret
? ret
: sprintf(buf
, "%ld\n", temperature
);
289 passive_store(struct device
*dev
, struct device_attribute
*attr
,
290 const char *buf
, size_t count
)
292 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
293 struct thermal_cooling_device
*cdev
= NULL
;
296 if (!sscanf(buf
, "%d\n", &state
))
299 /* sanity check: values below 1000 millicelcius don't make sense
300 * and can cause the system to go into a thermal heart attack
302 if (state
&& state
< 1000)
305 if (state
&& !tz
->forced_passive
) {
306 mutex_lock(&thermal_list_lock
);
307 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
308 if (!strncmp("Processor", cdev
->type
,
309 sizeof("Processor")))
310 thermal_zone_bind_cooling_device(tz
,
314 mutex_unlock(&thermal_list_lock
);
315 if (!tz
->passive_delay
)
316 tz
->passive_delay
= 1000;
317 } else if (!state
&& tz
->forced_passive
) {
318 mutex_lock(&thermal_list_lock
);
319 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
320 if (!strncmp("Processor", cdev
->type
,
321 sizeof("Processor")))
322 thermal_zone_unbind_cooling_device(tz
,
326 mutex_unlock(&thermal_list_lock
);
327 tz
->passive_delay
= 0;
333 tz
->forced_passive
= state
;
335 thermal_zone_device_update(tz
);
341 passive_show(struct device
*dev
, struct device_attribute
*attr
,
344 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
346 return sprintf(buf
, "%d\n", tz
->forced_passive
);
349 static DEVICE_ATTR(type
, 0444, type_show
, NULL
);
350 static DEVICE_ATTR(temp
, 0444, temp_show
, NULL
);
351 static DEVICE_ATTR(mode
, 0644, mode_show
, mode_store
);
352 static DEVICE_ATTR(passive
, S_IRUGO
| S_IWUSR
, passive_show
, passive_store
);
354 /* sys I/F for cooling device */
355 #define to_cooling_device(_dev) \
356 container_of(_dev, struct thermal_cooling_device, device)
359 thermal_cooling_device_type_show(struct device
*dev
,
360 struct device_attribute
*attr
, char *buf
)
362 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
364 return sprintf(buf
, "%s\n", cdev
->type
);
368 thermal_cooling_device_max_state_show(struct device
*dev
,
369 struct device_attribute
*attr
, char *buf
)
371 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
375 ret
= cdev
->ops
->get_max_state(cdev
, &state
);
378 return sprintf(buf
, "%ld\n", state
);
382 thermal_cooling_device_cur_state_show(struct device
*dev
,
383 struct device_attribute
*attr
, char *buf
)
385 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
389 ret
= cdev
->ops
->get_cur_state(cdev
, &state
);
392 return sprintf(buf
, "%ld\n", state
);
396 thermal_cooling_device_cur_state_store(struct device
*dev
,
397 struct device_attribute
*attr
,
398 const char *buf
, size_t count
)
400 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
404 if (!sscanf(buf
, "%ld\n", &state
))
410 result
= cdev
->ops
->set_cur_state(cdev
, state
);
416 static struct device_attribute dev_attr_cdev_type
=
417 __ATTR(type
, 0444, thermal_cooling_device_type_show
, NULL
);
418 static DEVICE_ATTR(max_state
, 0444,
419 thermal_cooling_device_max_state_show
, NULL
);
420 static DEVICE_ATTR(cur_state
, 0644,
421 thermal_cooling_device_cur_state_show
,
422 thermal_cooling_device_cur_state_store
);
425 thermal_cooling_device_trip_point_show(struct device
*dev
,
426 struct device_attribute
*attr
, char *buf
)
428 struct thermal_cooling_device_instance
*instance
;
431 container_of(attr
, struct thermal_cooling_device_instance
, attr
);
433 if (instance
->trip
== THERMAL_TRIPS_NONE
)
434 return sprintf(buf
, "-1\n");
436 return sprintf(buf
, "%d\n", instance
->trip
);
439 /* Device management */
441 #if defined(CONFIG_THERMAL_HWMON)
444 #include <linux/hwmon.h>
446 /* thermal zone devices with the same type share one hwmon device */
447 struct thermal_hwmon_device
{
448 char type
[THERMAL_NAME_LENGTH
];
449 struct device
*device
;
451 struct list_head tz_list
;
452 struct list_head node
;
455 struct thermal_hwmon_attr
{
456 struct device_attribute attr
;
460 /* one temperature input for each thermal zone */
461 struct thermal_hwmon_temp
{
462 struct list_head hwmon_node
;
463 struct thermal_zone_device
*tz
;
464 struct thermal_hwmon_attr temp_input
; /* hwmon sys attr */
465 struct thermal_hwmon_attr temp_crit
; /* hwmon sys attr */
468 static LIST_HEAD(thermal_hwmon_list
);
471 name_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
473 struct thermal_hwmon_device
*hwmon
= dev_get_drvdata(dev
);
474 return sprintf(buf
, "%s\n", hwmon
->type
);
476 static DEVICE_ATTR(name
, 0444, name_show
, NULL
);
479 temp_input_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
483 struct thermal_hwmon_attr
*hwmon_attr
484 = container_of(attr
, struct thermal_hwmon_attr
, attr
);
485 struct thermal_hwmon_temp
*temp
486 = container_of(hwmon_attr
, struct thermal_hwmon_temp
,
488 struct thermal_zone_device
*tz
= temp
->tz
;
490 ret
= tz
->ops
->get_temp(tz
, &temperature
);
495 return sprintf(buf
, "%ld\n", temperature
);
499 temp_crit_show(struct device
*dev
, struct device_attribute
*attr
,
502 struct thermal_hwmon_attr
*hwmon_attr
503 = container_of(attr
, struct thermal_hwmon_attr
, attr
);
504 struct thermal_hwmon_temp
*temp
505 = container_of(hwmon_attr
, struct thermal_hwmon_temp
,
507 struct thermal_zone_device
*tz
= temp
->tz
;
511 ret
= tz
->ops
->get_trip_temp(tz
, 0, &temperature
);
515 return sprintf(buf
, "%ld\n", temperature
);
519 static struct thermal_hwmon_device
*
520 thermal_hwmon_lookup_by_type(const struct thermal_zone_device
*tz
)
522 struct thermal_hwmon_device
*hwmon
;
524 mutex_lock(&thermal_list_lock
);
525 list_for_each_entry(hwmon
, &thermal_hwmon_list
, node
)
526 if (!strcmp(hwmon
->type
, tz
->type
)) {
527 mutex_unlock(&thermal_list_lock
);
530 mutex_unlock(&thermal_list_lock
);
535 /* Find the temperature input matching a given thermal zone */
536 static struct thermal_hwmon_temp
*
537 thermal_hwmon_lookup_temp(const struct thermal_hwmon_device
*hwmon
,
538 const struct thermal_zone_device
*tz
)
540 struct thermal_hwmon_temp
*temp
;
542 mutex_lock(&thermal_list_lock
);
543 list_for_each_entry(temp
, &hwmon
->tz_list
, hwmon_node
)
544 if (temp
->tz
== tz
) {
545 mutex_unlock(&thermal_list_lock
);
548 mutex_unlock(&thermal_list_lock
);
554 thermal_add_hwmon_sysfs(struct thermal_zone_device
*tz
)
556 struct thermal_hwmon_device
*hwmon
;
557 struct thermal_hwmon_temp
*temp
;
558 int new_hwmon_device
= 1;
561 hwmon
= thermal_hwmon_lookup_by_type(tz
);
563 new_hwmon_device
= 0;
564 goto register_sys_interface
;
567 hwmon
= kzalloc(sizeof(struct thermal_hwmon_device
), GFP_KERNEL
);
571 INIT_LIST_HEAD(&hwmon
->tz_list
);
572 strlcpy(hwmon
->type
, tz
->type
, THERMAL_NAME_LENGTH
);
573 hwmon
->device
= hwmon_device_register(NULL
);
574 if (IS_ERR(hwmon
->device
)) {
575 result
= PTR_ERR(hwmon
->device
);
578 dev_set_drvdata(hwmon
->device
, hwmon
);
579 result
= device_create_file(hwmon
->device
, &dev_attr_name
);
583 register_sys_interface
:
584 temp
= kzalloc(sizeof(struct thermal_hwmon_temp
), GFP_KERNEL
);
587 goto unregister_name
;
593 snprintf(temp
->temp_input
.name
, THERMAL_NAME_LENGTH
,
594 "temp%d_input", hwmon
->count
);
595 temp
->temp_input
.attr
.attr
.name
= temp
->temp_input
.name
;
596 temp
->temp_input
.attr
.attr
.mode
= 0444;
597 temp
->temp_input
.attr
.show
= temp_input_show
;
598 sysfs_attr_init(&temp
->temp_input
.attr
.attr
);
599 result
= device_create_file(hwmon
->device
, &temp
->temp_input
.attr
);
603 if (tz
->ops
->get_crit_temp
) {
604 unsigned long temperature
;
605 if (!tz
->ops
->get_crit_temp(tz
, &temperature
)) {
606 snprintf(temp
->temp_crit
.name
, THERMAL_NAME_LENGTH
,
607 "temp%d_crit", hwmon
->count
);
608 temp
->temp_crit
.attr
.attr
.name
= temp
->temp_crit
.name
;
609 temp
->temp_crit
.attr
.attr
.mode
= 0444;
610 temp
->temp_crit
.attr
.show
= temp_crit_show
;
611 sysfs_attr_init(&temp
->temp_crit
.attr
.attr
);
612 result
= device_create_file(hwmon
->device
,
613 &temp
->temp_crit
.attr
);
615 goto unregister_input
;
619 mutex_lock(&thermal_list_lock
);
620 if (new_hwmon_device
)
621 list_add_tail(&hwmon
->node
, &thermal_hwmon_list
);
622 list_add_tail(&temp
->hwmon_node
, &hwmon
->tz_list
);
623 mutex_unlock(&thermal_list_lock
);
628 device_remove_file(hwmon
->device
, &temp
->temp_input
.attr
);
632 if (new_hwmon_device
) {
633 device_remove_file(hwmon
->device
, &dev_attr_name
);
634 hwmon_device_unregister(hwmon
->device
);
637 if (new_hwmon_device
)
644 thermal_remove_hwmon_sysfs(struct thermal_zone_device
*tz
)
646 struct thermal_hwmon_device
*hwmon
;
647 struct thermal_hwmon_temp
*temp
;
649 hwmon
= thermal_hwmon_lookup_by_type(tz
);
650 if (unlikely(!hwmon
)) {
651 /* Should never happen... */
652 dev_dbg(&tz
->device
, "hwmon device lookup failed!\n");
656 temp
= thermal_hwmon_lookup_temp(hwmon
, tz
);
657 if (unlikely(!temp
)) {
658 /* Should never happen... */
659 dev_dbg(&tz
->device
, "temperature input lookup failed!\n");
663 device_remove_file(hwmon
->device
, &temp
->temp_input
.attr
);
664 if (tz
->ops
->get_crit_temp
)
665 device_remove_file(hwmon
->device
, &temp
->temp_crit
.attr
);
667 mutex_lock(&thermal_list_lock
);
668 list_del(&temp
->hwmon_node
);
670 if (!list_empty(&hwmon
->tz_list
)) {
671 mutex_unlock(&thermal_list_lock
);
674 list_del(&hwmon
->node
);
675 mutex_unlock(&thermal_list_lock
);
677 device_remove_file(hwmon
->device
, &dev_attr_name
);
678 hwmon_device_unregister(hwmon
->device
);
683 thermal_add_hwmon_sysfs(struct thermal_zone_device
*tz
)
689 thermal_remove_hwmon_sysfs(struct thermal_zone_device
*tz
)
694 static void thermal_zone_device_set_polling(struct thermal_zone_device
*tz
,
698 mod_delayed_work(system_freezable_wq
, &tz
->poll_queue
,
699 round_jiffies(msecs_to_jiffies(delay
)));
701 mod_delayed_work(system_freezable_wq
, &tz
->poll_queue
,
702 msecs_to_jiffies(delay
));
704 cancel_delayed_work(&tz
->poll_queue
);
707 static void thermal_zone_device_passive(struct thermal_zone_device
*tz
,
708 int temp
, int trip_temp
, int trip
)
711 struct thermal_cooling_device_instance
*instance
;
712 struct thermal_cooling_device
*cdev
;
713 long state
, max_state
;
718 * Calculate the thermal trend (using the passive cooling equation)
719 * and modify the performance limit for all passive cooling devices
720 * accordingly. Note that we assume symmetry.
722 if (temp
>= trip_temp
) {
725 trend
= (tz
->tc1
* (temp
- tz
->last_temperature
)) +
726 (tz
->tc2
* (temp
- trip_temp
));
730 list_for_each_entry(instance
, &tz
->cooling_devices
,
732 if (instance
->trip
!= trip
)
734 cdev
= instance
->cdev
;
735 cdev
->ops
->get_cur_state(cdev
, &state
);
736 cdev
->ops
->get_max_state(cdev
, &max_state
);
737 if (state
++ < max_state
)
738 cdev
->ops
->set_cur_state(cdev
, state
);
740 } else if (trend
< 0) { /* Cooling off? */
741 list_for_each_entry(instance
, &tz
->cooling_devices
,
743 if (instance
->trip
!= trip
)
745 cdev
= instance
->cdev
;
746 cdev
->ops
->get_cur_state(cdev
, &state
);
747 cdev
->ops
->get_max_state(cdev
, &max_state
);
749 cdev
->ops
->set_cur_state(cdev
, --state
);
758 * Implement passive cooling hysteresis to slowly increase performance
759 * and avoid thrashing around the passive trip point. Note that we
762 list_for_each_entry(instance
, &tz
->cooling_devices
, node
) {
763 if (instance
->trip
!= trip
)
765 cdev
= instance
->cdev
;
766 cdev
->ops
->get_cur_state(cdev
, &state
);
767 cdev
->ops
->get_max_state(cdev
, &max_state
);
769 cdev
->ops
->set_cur_state(cdev
, --state
);
775 static void thermal_zone_device_check(struct work_struct
*work
)
777 struct thermal_zone_device
*tz
= container_of(work
, struct
780 thermal_zone_device_update(tz
);
784 * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
785 * @tz: thermal zone device
786 * @trip: indicates which trip point the cooling devices is
787 * associated with in this thermal zone.
788 * @cdev: thermal cooling device
790 * This function is usually called in the thermal zone device .bind callback.
792 int thermal_zone_bind_cooling_device(struct thermal_zone_device
*tz
,
794 struct thermal_cooling_device
*cdev
)
796 struct thermal_cooling_device_instance
*dev
;
797 struct thermal_cooling_device_instance
*pos
;
798 struct thermal_zone_device
*pos1
;
799 struct thermal_cooling_device
*pos2
;
802 if (trip
>= tz
->trips
|| (trip
< 0 && trip
!= THERMAL_TRIPS_NONE
))
805 list_for_each_entry(pos1
, &thermal_tz_list
, node
) {
809 list_for_each_entry(pos2
, &thermal_cdev_list
, node
) {
814 if (tz
!= pos1
|| cdev
!= pos2
)
818 kzalloc(sizeof(struct thermal_cooling_device_instance
), GFP_KERNEL
);
824 result
= get_idr(&tz
->idr
, &tz
->lock
, &dev
->id
);
828 sprintf(dev
->name
, "cdev%d", dev
->id
);
830 sysfs_create_link(&tz
->device
.kobj
, &cdev
->device
.kobj
, dev
->name
);
834 sprintf(dev
->attr_name
, "cdev%d_trip_point", dev
->id
);
835 sysfs_attr_init(&dev
->attr
.attr
);
836 dev
->attr
.attr
.name
= dev
->attr_name
;
837 dev
->attr
.attr
.mode
= 0444;
838 dev
->attr
.show
= thermal_cooling_device_trip_point_show
;
839 result
= device_create_file(&tz
->device
, &dev
->attr
);
841 goto remove_symbol_link
;
843 mutex_lock(&tz
->lock
);
844 list_for_each_entry(pos
, &tz
->cooling_devices
, node
)
845 if (pos
->tz
== tz
&& pos
->trip
== trip
&& pos
->cdev
== cdev
) {
850 list_add_tail(&dev
->node
, &tz
->cooling_devices
);
851 mutex_unlock(&tz
->lock
);
856 device_remove_file(&tz
->device
, &dev
->attr
);
858 sysfs_remove_link(&tz
->device
.kobj
, dev
->name
);
860 release_idr(&tz
->idr
, &tz
->lock
, dev
->id
);
865 EXPORT_SYMBOL(thermal_zone_bind_cooling_device
);
868 * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
869 * @tz: thermal zone device
870 * @trip: indicates which trip point the cooling devices is
871 * associated with in this thermal zone.
872 * @cdev: thermal cooling device
874 * This function is usually called in the thermal zone device .unbind callback.
876 int thermal_zone_unbind_cooling_device(struct thermal_zone_device
*tz
,
878 struct thermal_cooling_device
*cdev
)
880 struct thermal_cooling_device_instance
*pos
, *next
;
882 mutex_lock(&tz
->lock
);
883 list_for_each_entry_safe(pos
, next
, &tz
->cooling_devices
, node
) {
884 if (pos
->tz
== tz
&& pos
->trip
== trip
&& pos
->cdev
== cdev
) {
885 list_del(&pos
->node
);
886 mutex_unlock(&tz
->lock
);
890 mutex_unlock(&tz
->lock
);
895 device_remove_file(&tz
->device
, &pos
->attr
);
896 sysfs_remove_link(&tz
->device
.kobj
, pos
->name
);
897 release_idr(&tz
->idr
, &tz
->lock
, pos
->id
);
901 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device
);
903 static void thermal_release(struct device
*dev
)
905 struct thermal_zone_device
*tz
;
906 struct thermal_cooling_device
*cdev
;
908 if (!strncmp(dev_name(dev
), "thermal_zone",
909 sizeof("thermal_zone") - 1)) {
910 tz
= to_thermal_zone(dev
);
913 cdev
= to_cooling_device(dev
);
918 static struct class thermal_class
= {
920 .dev_release
= thermal_release
,
924 * thermal_cooling_device_register - register a new thermal cooling device
925 * @type: the thermal cooling device type.
926 * @devdata: device private data.
927 * @ops: standard thermal cooling devices callbacks.
929 struct thermal_cooling_device
*
930 thermal_cooling_device_register(char *type
, void *devdata
,
931 const struct thermal_cooling_device_ops
*ops
)
933 struct thermal_cooling_device
*cdev
;
934 struct thermal_zone_device
*pos
;
937 if (strlen(type
) >= THERMAL_NAME_LENGTH
)
938 return ERR_PTR(-EINVAL
);
940 if (!ops
|| !ops
->get_max_state
|| !ops
->get_cur_state
||
942 return ERR_PTR(-EINVAL
);
944 cdev
= kzalloc(sizeof(struct thermal_cooling_device
), GFP_KERNEL
);
946 return ERR_PTR(-ENOMEM
);
948 result
= get_idr(&thermal_cdev_idr
, &thermal_idr_lock
, &cdev
->id
);
951 return ERR_PTR(result
);
954 strcpy(cdev
->type
, type
);
956 cdev
->device
.class = &thermal_class
;
957 cdev
->devdata
= devdata
;
958 dev_set_name(&cdev
->device
, "cooling_device%d", cdev
->id
);
959 result
= device_register(&cdev
->device
);
961 release_idr(&thermal_cdev_idr
, &thermal_idr_lock
, cdev
->id
);
963 return ERR_PTR(result
);
968 result
= device_create_file(&cdev
->device
, &dev_attr_cdev_type
);
973 result
= device_create_file(&cdev
->device
, &dev_attr_max_state
);
977 result
= device_create_file(&cdev
->device
, &dev_attr_cur_state
);
981 mutex_lock(&thermal_list_lock
);
982 list_add(&cdev
->node
, &thermal_cdev_list
);
983 list_for_each_entry(pos
, &thermal_tz_list
, node
) {
986 result
= pos
->ops
->bind(pos
, cdev
);
991 mutex_unlock(&thermal_list_lock
);
997 release_idr(&thermal_cdev_idr
, &thermal_idr_lock
, cdev
->id
);
998 device_unregister(&cdev
->device
);
999 return ERR_PTR(result
);
1001 EXPORT_SYMBOL(thermal_cooling_device_register
);
1004 * thermal_cooling_device_unregister - removes the registered thermal cooling device
1005 * @cdev: the thermal cooling device to remove.
1007 * thermal_cooling_device_unregister() must be called when the device is no
1010 void thermal_cooling_device_unregister(struct
1011 thermal_cooling_device
1014 struct thermal_zone_device
*tz
;
1015 struct thermal_cooling_device
*pos
= NULL
;
1020 mutex_lock(&thermal_list_lock
);
1021 list_for_each_entry(pos
, &thermal_cdev_list
, node
)
1025 /* thermal cooling device not found */
1026 mutex_unlock(&thermal_list_lock
);
1029 list_del(&cdev
->node
);
1030 list_for_each_entry(tz
, &thermal_tz_list
, node
) {
1031 if (!tz
->ops
->unbind
)
1033 tz
->ops
->unbind(tz
, cdev
);
1035 mutex_unlock(&thermal_list_lock
);
1037 device_remove_file(&cdev
->device
, &dev_attr_cdev_type
);
1038 device_remove_file(&cdev
->device
, &dev_attr_max_state
);
1039 device_remove_file(&cdev
->device
, &dev_attr_cur_state
);
1041 release_idr(&thermal_cdev_idr
, &thermal_idr_lock
, cdev
->id
);
1042 device_unregister(&cdev
->device
);
1045 EXPORT_SYMBOL(thermal_cooling_device_unregister
);
1048 * thermal_zone_device_update - force an update of a thermal zone's state
1049 * @ttz: the thermal zone to update
1052 void thermal_zone_device_update(struct thermal_zone_device
*tz
)
1055 long temp
, trip_temp
;
1056 enum thermal_trip_type trip_type
;
1057 struct thermal_cooling_device_instance
*instance
;
1058 struct thermal_cooling_device
*cdev
;
1060 mutex_lock(&tz
->lock
);
1062 if (tz
->ops
->get_temp(tz
, &temp
)) {
1063 /* get_temp failed - retry it later */
1064 pr_warn("failed to read out thermal zone %d\n", tz
->id
);
1068 for (count
= 0; count
< tz
->trips
; count
++) {
1069 tz
->ops
->get_trip_type(tz
, count
, &trip_type
);
1070 tz
->ops
->get_trip_temp(tz
, count
, &trip_temp
);
1072 switch (trip_type
) {
1073 case THERMAL_TRIP_CRITICAL
:
1074 if (temp
>= trip_temp
) {
1075 if (tz
->ops
->notify
)
1076 ret
= tz
->ops
->notify(tz
, count
,
1079 pr_emerg("Critical temperature reached (%ld C), shutting down\n",
1081 orderly_poweroff(true);
1085 case THERMAL_TRIP_HOT
:
1086 if (temp
>= trip_temp
)
1087 if (tz
->ops
->notify
)
1088 tz
->ops
->notify(tz
, count
, trip_type
);
1090 case THERMAL_TRIP_ACTIVE
:
1091 list_for_each_entry(instance
, &tz
->cooling_devices
,
1093 if (instance
->trip
!= count
)
1096 cdev
= instance
->cdev
;
1098 if (temp
>= trip_temp
)
1099 cdev
->ops
->set_cur_state(cdev
, 1);
1101 cdev
->ops
->set_cur_state(cdev
, 0);
1104 case THERMAL_TRIP_PASSIVE
:
1105 if (temp
>= trip_temp
|| tz
->passive
)
1106 thermal_zone_device_passive(tz
, temp
,
1112 if (tz
->forced_passive
)
1113 thermal_zone_device_passive(tz
, temp
, tz
->forced_passive
,
1114 THERMAL_TRIPS_NONE
);
1116 tz
->last_temperature
= temp
;
1120 thermal_zone_device_set_polling(tz
, tz
->passive_delay
);
1121 else if (tz
->polling_delay
)
1122 thermal_zone_device_set_polling(tz
, tz
->polling_delay
);
1124 thermal_zone_device_set_polling(tz
, 0);
1125 mutex_unlock(&tz
->lock
);
1127 EXPORT_SYMBOL(thermal_zone_device_update
);
1130 * create_trip_attrs - create attributes for trip points
1131 * @tz: the thermal zone device
1132 * @mask: Writeable trip point bitmap.
1134 static int create_trip_attrs(struct thermal_zone_device
*tz
, int mask
)
1137 int size
= sizeof(struct thermal_attr
) * tz
->trips
;
1139 tz
->trip_type_attrs
= kzalloc(size
, GFP_KERNEL
);
1140 if (!tz
->trip_type_attrs
)
1143 tz
->trip_temp_attrs
= kzalloc(size
, GFP_KERNEL
);
1144 if (!tz
->trip_temp_attrs
) {
1145 kfree(tz
->trip_type_attrs
);
1149 if (tz
->ops
->get_trip_hyst
) {
1150 tz
->trip_hyst_attrs
= kzalloc(size
, GFP_KERNEL
);
1151 if (!tz
->trip_hyst_attrs
) {
1152 kfree(tz
->trip_type_attrs
);
1153 kfree(tz
->trip_temp_attrs
);
1159 for (indx
= 0; indx
< tz
->trips
; indx
++) {
1160 /* create trip type attribute */
1161 snprintf(tz
->trip_type_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1162 "trip_point_%d_type", indx
);
1164 sysfs_attr_init(&tz
->trip_type_attrs
[indx
].attr
.attr
);
1165 tz
->trip_type_attrs
[indx
].attr
.attr
.name
=
1166 tz
->trip_type_attrs
[indx
].name
;
1167 tz
->trip_type_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1168 tz
->trip_type_attrs
[indx
].attr
.show
= trip_point_type_show
;
1170 device_create_file(&tz
->device
,
1171 &tz
->trip_type_attrs
[indx
].attr
);
1173 /* create trip temp attribute */
1174 snprintf(tz
->trip_temp_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1175 "trip_point_%d_temp", indx
);
1177 sysfs_attr_init(&tz
->trip_temp_attrs
[indx
].attr
.attr
);
1178 tz
->trip_temp_attrs
[indx
].attr
.attr
.name
=
1179 tz
->trip_temp_attrs
[indx
].name
;
1180 tz
->trip_temp_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1181 tz
->trip_temp_attrs
[indx
].attr
.show
= trip_point_temp_show
;
1182 if (mask
& (1 << indx
)) {
1183 tz
->trip_temp_attrs
[indx
].attr
.attr
.mode
|= S_IWUSR
;
1184 tz
->trip_temp_attrs
[indx
].attr
.store
=
1185 trip_point_temp_store
;
1188 device_create_file(&tz
->device
,
1189 &tz
->trip_temp_attrs
[indx
].attr
);
1191 /* create Optional trip hyst attribute */
1192 if (!tz
->ops
->get_trip_hyst
)
1194 snprintf(tz
->trip_hyst_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1195 "trip_point_%d_hyst", indx
);
1197 sysfs_attr_init(&tz
->trip_hyst_attrs
[indx
].attr
.attr
);
1198 tz
->trip_hyst_attrs
[indx
].attr
.attr
.name
=
1199 tz
->trip_hyst_attrs
[indx
].name
;
1200 tz
->trip_hyst_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1201 tz
->trip_hyst_attrs
[indx
].attr
.show
= trip_point_hyst_show
;
1202 if (tz
->ops
->set_trip_hyst
) {
1203 tz
->trip_hyst_attrs
[indx
].attr
.attr
.mode
|= S_IWUSR
;
1204 tz
->trip_hyst_attrs
[indx
].attr
.store
=
1205 trip_point_hyst_store
;
1208 device_create_file(&tz
->device
,
1209 &tz
->trip_hyst_attrs
[indx
].attr
);
1214 static void remove_trip_attrs(struct thermal_zone_device
*tz
)
1218 for (indx
= 0; indx
< tz
->trips
; indx
++) {
1219 device_remove_file(&tz
->device
,
1220 &tz
->trip_type_attrs
[indx
].attr
);
1221 device_remove_file(&tz
->device
,
1222 &tz
->trip_temp_attrs
[indx
].attr
);
1223 if (tz
->ops
->get_trip_hyst
)
1224 device_remove_file(&tz
->device
,
1225 &tz
->trip_hyst_attrs
[indx
].attr
);
1227 kfree(tz
->trip_type_attrs
);
1228 kfree(tz
->trip_temp_attrs
);
1229 kfree(tz
->trip_hyst_attrs
);
1233 * thermal_zone_device_register - register a new thermal zone device
1234 * @type: the thermal zone device type
1235 * @trips: the number of trip points the thermal zone support
1236 * @mask: a bit string indicating the writeablility of trip points
1237 * @devdata: private device data
1238 * @ops: standard thermal zone device callbacks
1239 * @tc1: thermal coefficient 1 for passive calculations
1240 * @tc2: thermal coefficient 2 for passive calculations
1241 * @passive_delay: number of milliseconds to wait between polls when
1242 * performing passive cooling
1243 * @polling_delay: number of milliseconds to wait between polls when checking
1244 * whether trip points have been crossed (0 for interrupt
1247 * thermal_zone_device_unregister() must be called when the device is no
1248 * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1249 * section 11.1.5.1 of the ACPI specification 3.0.
1251 struct thermal_zone_device
*thermal_zone_device_register(const char *type
,
1252 int trips
, int mask
, void *devdata
,
1253 const struct thermal_zone_device_ops
*ops
,
1254 int tc1
, int tc2
, int passive_delay
, int polling_delay
)
1256 struct thermal_zone_device
*tz
;
1257 struct thermal_cooling_device
*pos
;
1258 enum thermal_trip_type trip_type
;
1263 if (strlen(type
) >= THERMAL_NAME_LENGTH
)
1264 return ERR_PTR(-EINVAL
);
1266 if (trips
> THERMAL_MAX_TRIPS
|| trips
< 0 || mask
>> trips
)
1267 return ERR_PTR(-EINVAL
);
1269 if (!ops
|| !ops
->get_temp
)
1270 return ERR_PTR(-EINVAL
);
1272 tz
= kzalloc(sizeof(struct thermal_zone_device
), GFP_KERNEL
);
1274 return ERR_PTR(-ENOMEM
);
1276 INIT_LIST_HEAD(&tz
->cooling_devices
);
1278 mutex_init(&tz
->lock
);
1279 result
= get_idr(&thermal_tz_idr
, &thermal_idr_lock
, &tz
->id
);
1282 return ERR_PTR(result
);
1285 strcpy(tz
->type
, type
);
1287 tz
->device
.class = &thermal_class
;
1288 tz
->devdata
= devdata
;
1292 tz
->passive_delay
= passive_delay
;
1293 tz
->polling_delay
= polling_delay
;
1295 dev_set_name(&tz
->device
, "thermal_zone%d", tz
->id
);
1296 result
= device_register(&tz
->device
);
1298 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
1300 return ERR_PTR(result
);
1305 result
= device_create_file(&tz
->device
, &dev_attr_type
);
1310 result
= device_create_file(&tz
->device
, &dev_attr_temp
);
1314 if (ops
->get_mode
) {
1315 result
= device_create_file(&tz
->device
, &dev_attr_mode
);
1320 result
= create_trip_attrs(tz
, mask
);
1324 for (count
= 0; count
< trips
; count
++) {
1325 tz
->ops
->get_trip_type(tz
, count
, &trip_type
);
1326 if (trip_type
== THERMAL_TRIP_PASSIVE
)
1331 result
= device_create_file(&tz
->device
,
1337 result
= thermal_add_hwmon_sysfs(tz
);
1341 mutex_lock(&thermal_list_lock
);
1342 list_add_tail(&tz
->node
, &thermal_tz_list
);
1344 list_for_each_entry(pos
, &thermal_cdev_list
, node
) {
1345 result
= ops
->bind(tz
, pos
);
1349 mutex_unlock(&thermal_list_lock
);
1351 INIT_DELAYED_WORK(&(tz
->poll_queue
), thermal_zone_device_check
);
1353 thermal_zone_device_update(tz
);
1359 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
1360 device_unregister(&tz
->device
);
1361 return ERR_PTR(result
);
1363 EXPORT_SYMBOL(thermal_zone_device_register
);
1366 * thermal_device_unregister - removes the registered thermal zone device
1367 * @tz: the thermal zone device to remove
1369 void thermal_zone_device_unregister(struct thermal_zone_device
*tz
)
1371 struct thermal_cooling_device
*cdev
;
1372 struct thermal_zone_device
*pos
= NULL
;
1377 mutex_lock(&thermal_list_lock
);
1378 list_for_each_entry(pos
, &thermal_tz_list
, node
)
1382 /* thermal zone device not found */
1383 mutex_unlock(&thermal_list_lock
);
1386 list_del(&tz
->node
);
1387 if (tz
->ops
->unbind
)
1388 list_for_each_entry(cdev
, &thermal_cdev_list
, node
)
1389 tz
->ops
->unbind(tz
, cdev
);
1390 mutex_unlock(&thermal_list_lock
);
1392 thermal_zone_device_set_polling(tz
, 0);
1395 device_remove_file(&tz
->device
, &dev_attr_type
);
1396 device_remove_file(&tz
->device
, &dev_attr_temp
);
1397 if (tz
->ops
->get_mode
)
1398 device_remove_file(&tz
->device
, &dev_attr_mode
);
1399 remove_trip_attrs(tz
);
1401 thermal_remove_hwmon_sysfs(tz
);
1402 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
1403 idr_destroy(&tz
->idr
);
1404 mutex_destroy(&tz
->lock
);
1405 device_unregister(&tz
->device
);
1408 EXPORT_SYMBOL(thermal_zone_device_unregister
);
1411 static struct genl_family thermal_event_genl_family
= {
1412 .id
= GENL_ID_GENERATE
,
1413 .name
= THERMAL_GENL_FAMILY_NAME
,
1414 .version
= THERMAL_GENL_VERSION
,
1415 .maxattr
= THERMAL_GENL_ATTR_MAX
,
1418 static struct genl_multicast_group thermal_event_mcgrp
= {
1419 .name
= THERMAL_GENL_MCAST_GROUP_NAME
,
1422 int thermal_generate_netlink_event(u32 orig
, enum events event
)
1424 struct sk_buff
*skb
;
1425 struct nlattr
*attr
;
1426 struct thermal_genl_event
*thermal_event
;
1430 static unsigned int thermal_event_seqnum
;
1432 /* allocate memory */
1433 size
= nla_total_size(sizeof(struct thermal_genl_event
)) +
1436 skb
= genlmsg_new(size
, GFP_ATOMIC
);
1440 /* add the genetlink message header */
1441 msg_header
= genlmsg_put(skb
, 0, thermal_event_seqnum
++,
1442 &thermal_event_genl_family
, 0,
1443 THERMAL_GENL_CMD_EVENT
);
1450 attr
= nla_reserve(skb
, THERMAL_GENL_ATTR_EVENT
,
1451 sizeof(struct thermal_genl_event
));
1458 thermal_event
= nla_data(attr
);
1459 if (!thermal_event
) {
1464 memset(thermal_event
, 0, sizeof(struct thermal_genl_event
));
1466 thermal_event
->orig
= orig
;
1467 thermal_event
->event
= event
;
1469 /* send multicast genetlink message */
1470 result
= genlmsg_end(skb
, msg_header
);
1476 result
= genlmsg_multicast(skb
, 0, thermal_event_mcgrp
.id
, GFP_ATOMIC
);
1478 pr_info("failed to send netlink event:%d\n", result
);
1482 EXPORT_SYMBOL(thermal_generate_netlink_event
);
1484 static int genetlink_init(void)
1488 result
= genl_register_family(&thermal_event_genl_family
);
1492 result
= genl_register_mc_group(&thermal_event_genl_family
,
1493 &thermal_event_mcgrp
);
1495 genl_unregister_family(&thermal_event_genl_family
);
1499 static void genetlink_exit(void)
1501 genl_unregister_family(&thermal_event_genl_family
);
1503 #else /* !CONFIG_NET */
1504 static inline int genetlink_init(void) { return 0; }
1505 static inline void genetlink_exit(void) {}
1506 #endif /* !CONFIG_NET */
1508 static int __init
thermal_init(void)
1512 result
= class_register(&thermal_class
);
1514 idr_destroy(&thermal_tz_idr
);
1515 idr_destroy(&thermal_cdev_idr
);
1516 mutex_destroy(&thermal_idr_lock
);
1517 mutex_destroy(&thermal_list_lock
);
1519 result
= genetlink_init();
1523 static void __exit
thermal_exit(void)
1525 class_unregister(&thermal_class
);
1526 idr_destroy(&thermal_tz_idr
);
1527 idr_destroy(&thermal_cdev_idr
);
1528 mutex_destroy(&thermal_idr_lock
);
1529 mutex_destroy(&thermal_list_lock
);
1533 fs_initcall(thermal_init
);
1534 module_exit(thermal_exit
);