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/reboot.h>
36 #include <linux/string.h>
38 #include <net/netlink.h>
39 #include <net/genetlink.h>
41 #define CREATE_TRACE_POINTS
42 #include <trace/events/thermal.h>
44 #include "thermal_core.h"
45 #include "thermal_hwmon.h"
47 MODULE_AUTHOR("Zhang Rui");
48 MODULE_DESCRIPTION("Generic thermal management sysfs support");
49 MODULE_LICENSE("GPL v2");
51 static DEFINE_IDR(thermal_tz_idr
);
52 static DEFINE_IDR(thermal_cdev_idr
);
53 static DEFINE_MUTEX(thermal_idr_lock
);
55 static LIST_HEAD(thermal_tz_list
);
56 static LIST_HEAD(thermal_cdev_list
);
57 static LIST_HEAD(thermal_governor_list
);
59 static DEFINE_MUTEX(thermal_list_lock
);
60 static DEFINE_MUTEX(thermal_governor_lock
);
62 static struct thermal_governor
*def_governor
;
64 static struct thermal_governor
*__find_governor(const char *name
)
66 struct thermal_governor
*pos
;
68 if (!name
|| !name
[0])
71 list_for_each_entry(pos
, &thermal_governor_list
, governor_list
)
72 if (!strncasecmp(name
, pos
->name
, THERMAL_NAME_LENGTH
))
78 int thermal_register_governor(struct thermal_governor
*governor
)
82 struct thermal_zone_device
*pos
;
87 mutex_lock(&thermal_governor_lock
);
90 if (__find_governor(governor
->name
) == NULL
) {
92 list_add(&governor
->governor_list
, &thermal_governor_list
);
93 if (!def_governor
&& !strncmp(governor
->name
,
94 DEFAULT_THERMAL_GOVERNOR
, THERMAL_NAME_LENGTH
))
95 def_governor
= governor
;
98 mutex_lock(&thermal_list_lock
);
100 list_for_each_entry(pos
, &thermal_tz_list
, node
) {
102 * only thermal zones with specified tz->tzp->governor_name
103 * may run with tz->govenor unset
108 name
= pos
->tzp
->governor_name
;
110 if (!strncasecmp(name
, governor
->name
, THERMAL_NAME_LENGTH
))
111 pos
->governor
= governor
;
114 mutex_unlock(&thermal_list_lock
);
115 mutex_unlock(&thermal_governor_lock
);
120 void thermal_unregister_governor(struct thermal_governor
*governor
)
122 struct thermal_zone_device
*pos
;
127 mutex_lock(&thermal_governor_lock
);
129 if (__find_governor(governor
->name
) == NULL
)
132 mutex_lock(&thermal_list_lock
);
134 list_for_each_entry(pos
, &thermal_tz_list
, node
) {
135 if (!strncasecmp(pos
->governor
->name
, governor
->name
,
136 THERMAL_NAME_LENGTH
))
137 pos
->governor
= NULL
;
140 mutex_unlock(&thermal_list_lock
);
141 list_del(&governor
->governor_list
);
143 mutex_unlock(&thermal_governor_lock
);
147 static int get_idr(struct idr
*idr
, struct mutex
*lock
, int *id
)
153 ret
= idr_alloc(idr
, NULL
, 0, 0, GFP_KERNEL
);
156 if (unlikely(ret
< 0))
162 static void release_idr(struct idr
*idr
, struct mutex
*lock
, int id
)
171 int get_tz_trend(struct thermal_zone_device
*tz
, int trip
)
173 enum thermal_trend trend
;
175 if (tz
->emul_temperature
|| !tz
->ops
->get_trend
||
176 tz
->ops
->get_trend(tz
, trip
, &trend
)) {
177 if (tz
->temperature
> tz
->last_temperature
)
178 trend
= THERMAL_TREND_RAISING
;
179 else if (tz
->temperature
< tz
->last_temperature
)
180 trend
= THERMAL_TREND_DROPPING
;
182 trend
= THERMAL_TREND_STABLE
;
187 EXPORT_SYMBOL(get_tz_trend
);
189 struct thermal_instance
*get_thermal_instance(struct thermal_zone_device
*tz
,
190 struct thermal_cooling_device
*cdev
, int trip
)
192 struct thermal_instance
*pos
= NULL
;
193 struct thermal_instance
*target_instance
= NULL
;
195 mutex_lock(&tz
->lock
);
196 mutex_lock(&cdev
->lock
);
198 list_for_each_entry(pos
, &tz
->thermal_instances
, tz_node
) {
199 if (pos
->tz
== tz
&& pos
->trip
== trip
&& pos
->cdev
== cdev
) {
200 target_instance
= pos
;
205 mutex_unlock(&cdev
->lock
);
206 mutex_unlock(&tz
->lock
);
208 return target_instance
;
210 EXPORT_SYMBOL(get_thermal_instance
);
212 static void print_bind_err_msg(struct thermal_zone_device
*tz
,
213 struct thermal_cooling_device
*cdev
, int ret
)
215 dev_err(&tz
->device
, "binding zone %s with cdev %s failed:%d\n",
216 tz
->type
, cdev
->type
, ret
);
219 static void __bind(struct thermal_zone_device
*tz
, int mask
,
220 struct thermal_cooling_device
*cdev
,
221 unsigned long *limits
)
225 for (i
= 0; i
< tz
->trips
; i
++) {
226 if (mask
& (1 << i
)) {
227 unsigned long upper
, lower
;
229 upper
= THERMAL_NO_LIMIT
;
230 lower
= THERMAL_NO_LIMIT
;
232 lower
= limits
[i
* 2];
233 upper
= limits
[i
* 2 + 1];
235 ret
= thermal_zone_bind_cooling_device(tz
, i
, cdev
,
238 print_bind_err_msg(tz
, cdev
, ret
);
243 static void __unbind(struct thermal_zone_device
*tz
, int mask
,
244 struct thermal_cooling_device
*cdev
)
248 for (i
= 0; i
< tz
->trips
; i
++)
250 thermal_zone_unbind_cooling_device(tz
, i
, cdev
);
253 static void bind_cdev(struct thermal_cooling_device
*cdev
)
256 const struct thermal_zone_params
*tzp
;
257 struct thermal_zone_device
*pos
= NULL
;
259 mutex_lock(&thermal_list_lock
);
261 list_for_each_entry(pos
, &thermal_tz_list
, node
) {
262 if (!pos
->tzp
&& !pos
->ops
->bind
)
265 if (pos
->ops
->bind
) {
266 ret
= pos
->ops
->bind(pos
, cdev
);
268 print_bind_err_msg(pos
, cdev
, ret
);
273 if (!tzp
|| !tzp
->tbp
)
276 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
277 if (tzp
->tbp
[i
].cdev
|| !tzp
->tbp
[i
].match
)
279 if (tzp
->tbp
[i
].match(pos
, cdev
))
281 tzp
->tbp
[i
].cdev
= cdev
;
282 __bind(pos
, tzp
->tbp
[i
].trip_mask
, cdev
,
283 tzp
->tbp
[i
].binding_limits
);
287 mutex_unlock(&thermal_list_lock
);
290 static void bind_tz(struct thermal_zone_device
*tz
)
293 struct thermal_cooling_device
*pos
= NULL
;
294 const struct thermal_zone_params
*tzp
= tz
->tzp
;
296 if (!tzp
&& !tz
->ops
->bind
)
299 mutex_lock(&thermal_list_lock
);
301 /* If there is ops->bind, try to use ops->bind */
303 list_for_each_entry(pos
, &thermal_cdev_list
, node
) {
304 ret
= tz
->ops
->bind(tz
, pos
);
306 print_bind_err_msg(tz
, pos
, ret
);
311 if (!tzp
|| !tzp
->tbp
)
314 list_for_each_entry(pos
, &thermal_cdev_list
, node
) {
315 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
316 if (tzp
->tbp
[i
].cdev
|| !tzp
->tbp
[i
].match
)
318 if (tzp
->tbp
[i
].match(tz
, pos
))
320 tzp
->tbp
[i
].cdev
= pos
;
321 __bind(tz
, tzp
->tbp
[i
].trip_mask
, pos
,
322 tzp
->tbp
[i
].binding_limits
);
326 mutex_unlock(&thermal_list_lock
);
329 static void thermal_zone_device_set_polling(struct thermal_zone_device
*tz
,
333 mod_delayed_work(system_freezable_wq
, &tz
->poll_queue
,
334 round_jiffies(msecs_to_jiffies(delay
)));
336 mod_delayed_work(system_freezable_wq
, &tz
->poll_queue
,
337 msecs_to_jiffies(delay
));
339 cancel_delayed_work(&tz
->poll_queue
);
342 static void monitor_thermal_zone(struct thermal_zone_device
*tz
)
344 mutex_lock(&tz
->lock
);
347 thermal_zone_device_set_polling(tz
, tz
->passive_delay
);
348 else if (tz
->polling_delay
)
349 thermal_zone_device_set_polling(tz
, tz
->polling_delay
);
351 thermal_zone_device_set_polling(tz
, 0);
353 mutex_unlock(&tz
->lock
);
356 static void handle_non_critical_trips(struct thermal_zone_device
*tz
,
357 int trip
, enum thermal_trip_type trip_type
)
359 tz
->governor
? tz
->governor
->throttle(tz
, trip
) :
360 def_governor
->throttle(tz
, trip
);
363 static void handle_critical_trips(struct thermal_zone_device
*tz
,
364 int trip
, enum thermal_trip_type trip_type
)
368 tz
->ops
->get_trip_temp(tz
, trip
, &trip_temp
);
370 /* If we have not crossed the trip_temp, we do not care. */
371 if (trip_temp
<= 0 || tz
->temperature
< trip_temp
)
374 trace_thermal_zone_trip(tz
, trip
, trip_type
);
377 tz
->ops
->notify(tz
, trip
, trip_type
);
379 if (trip_type
== THERMAL_TRIP_CRITICAL
) {
380 dev_emerg(&tz
->device
,
381 "critical temperature reached(%d C),shutting down\n",
382 tz
->temperature
/ 1000);
383 orderly_poweroff(true);
387 static void handle_thermal_trip(struct thermal_zone_device
*tz
, int trip
)
389 enum thermal_trip_type type
;
391 tz
->ops
->get_trip_type(tz
, trip
, &type
);
393 if (type
== THERMAL_TRIP_CRITICAL
|| type
== THERMAL_TRIP_HOT
)
394 handle_critical_trips(tz
, trip
, type
);
396 handle_non_critical_trips(tz
, trip
, type
);
398 * Alright, we handled this trip successfully.
399 * So, start monitoring again.
401 monitor_thermal_zone(tz
);
405 * thermal_zone_get_temp() - returns its the temperature of thermal zone
406 * @tz: a valid pointer to a struct thermal_zone_device
407 * @temp: a valid pointer to where to store the resulting temperature.
409 * When a valid thermal zone reference is passed, it will fetch its
410 * temperature and fill @temp.
412 * Return: On success returns 0, an error code otherwise
414 int thermal_zone_get_temp(struct thermal_zone_device
*tz
, unsigned long *temp
)
417 #ifdef CONFIG_THERMAL_EMULATION
419 unsigned long crit_temp
= -1UL;
420 enum thermal_trip_type type
;
423 if (!tz
|| IS_ERR(tz
) || !tz
->ops
->get_temp
)
426 mutex_lock(&tz
->lock
);
428 ret
= tz
->ops
->get_temp(tz
, temp
);
429 #ifdef CONFIG_THERMAL_EMULATION
430 if (!tz
->emul_temperature
)
433 for (count
= 0; count
< tz
->trips
; count
++) {
434 ret
= tz
->ops
->get_trip_type(tz
, count
, &type
);
435 if (!ret
&& type
== THERMAL_TRIP_CRITICAL
) {
436 ret
= tz
->ops
->get_trip_temp(tz
, count
, &crit_temp
);
444 if (*temp
< crit_temp
)
445 *temp
= tz
->emul_temperature
;
448 mutex_unlock(&tz
->lock
);
452 EXPORT_SYMBOL_GPL(thermal_zone_get_temp
);
454 static void update_temperature(struct thermal_zone_device
*tz
)
459 ret
= thermal_zone_get_temp(tz
, &temp
);
462 dev_warn(&tz
->device
,
463 "failed to read out thermal zone (%d)\n",
468 mutex_lock(&tz
->lock
);
469 tz
->last_temperature
= tz
->temperature
;
470 tz
->temperature
= temp
;
471 mutex_unlock(&tz
->lock
);
473 trace_thermal_temperature(tz
);
474 dev_dbg(&tz
->device
, "last_temperature=%d, current_temperature=%d\n",
475 tz
->last_temperature
, tz
->temperature
);
478 void thermal_zone_device_update(struct thermal_zone_device
*tz
)
482 if (!tz
->ops
->get_temp
)
485 update_temperature(tz
);
487 for (count
= 0; count
< tz
->trips
; count
++)
488 handle_thermal_trip(tz
, count
);
490 EXPORT_SYMBOL_GPL(thermal_zone_device_update
);
492 static void thermal_zone_device_check(struct work_struct
*work
)
494 struct thermal_zone_device
*tz
= container_of(work
, struct
497 thermal_zone_device_update(tz
);
500 /* sys I/F for thermal zone */
502 #define to_thermal_zone(_dev) \
503 container_of(_dev, struct thermal_zone_device, device)
506 type_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
508 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
510 return sprintf(buf
, "%s\n", tz
->type
);
514 temp_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
516 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
520 ret
= thermal_zone_get_temp(tz
, &temperature
);
525 return sprintf(buf
, "%ld\n", temperature
);
529 mode_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
531 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
532 enum thermal_device_mode mode
;
535 if (!tz
->ops
->get_mode
)
538 result
= tz
->ops
->get_mode(tz
, &mode
);
542 return sprintf(buf
, "%s\n", mode
== THERMAL_DEVICE_ENABLED
? "enabled"
547 mode_store(struct device
*dev
, struct device_attribute
*attr
,
548 const char *buf
, size_t count
)
550 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
553 if (!tz
->ops
->set_mode
)
556 if (!strncmp(buf
, "enabled", sizeof("enabled") - 1))
557 result
= tz
->ops
->set_mode(tz
, THERMAL_DEVICE_ENABLED
);
558 else if (!strncmp(buf
, "disabled", sizeof("disabled") - 1))
559 result
= tz
->ops
->set_mode(tz
, THERMAL_DEVICE_DISABLED
);
570 trip_point_type_show(struct device
*dev
, struct device_attribute
*attr
,
573 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
574 enum thermal_trip_type type
;
577 if (!tz
->ops
->get_trip_type
)
580 if (!sscanf(attr
->attr
.name
, "trip_point_%d_type", &trip
))
583 result
= tz
->ops
->get_trip_type(tz
, trip
, &type
);
588 case THERMAL_TRIP_CRITICAL
:
589 return sprintf(buf
, "critical\n");
590 case THERMAL_TRIP_HOT
:
591 return sprintf(buf
, "hot\n");
592 case THERMAL_TRIP_PASSIVE
:
593 return sprintf(buf
, "passive\n");
594 case THERMAL_TRIP_ACTIVE
:
595 return sprintf(buf
, "active\n");
597 return sprintf(buf
, "unknown\n");
602 trip_point_temp_store(struct device
*dev
, struct device_attribute
*attr
,
603 const char *buf
, size_t count
)
605 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
607 unsigned long temperature
;
609 if (!tz
->ops
->set_trip_temp
)
612 if (!sscanf(attr
->attr
.name
, "trip_point_%d_temp", &trip
))
615 if (kstrtoul(buf
, 10, &temperature
))
618 ret
= tz
->ops
->set_trip_temp(tz
, trip
, temperature
);
620 return ret
? ret
: count
;
624 trip_point_temp_show(struct device
*dev
, struct device_attribute
*attr
,
627 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
631 if (!tz
->ops
->get_trip_temp
)
634 if (!sscanf(attr
->attr
.name
, "trip_point_%d_temp", &trip
))
637 ret
= tz
->ops
->get_trip_temp(tz
, trip
, &temperature
);
642 return sprintf(buf
, "%ld\n", temperature
);
646 trip_point_hyst_store(struct device
*dev
, struct device_attribute
*attr
,
647 const char *buf
, size_t count
)
649 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
651 unsigned long temperature
;
653 if (!tz
->ops
->set_trip_hyst
)
656 if (!sscanf(attr
->attr
.name
, "trip_point_%d_hyst", &trip
))
659 if (kstrtoul(buf
, 10, &temperature
))
663 * We are not doing any check on the 'temperature' value
664 * here. The driver implementing 'set_trip_hyst' has to
667 ret
= tz
->ops
->set_trip_hyst(tz
, trip
, temperature
);
669 return ret
? ret
: count
;
673 trip_point_hyst_show(struct device
*dev
, struct device_attribute
*attr
,
676 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
678 unsigned long temperature
;
680 if (!tz
->ops
->get_trip_hyst
)
683 if (!sscanf(attr
->attr
.name
, "trip_point_%d_hyst", &trip
))
686 ret
= tz
->ops
->get_trip_hyst(tz
, trip
, &temperature
);
688 return ret
? ret
: sprintf(buf
, "%ld\n", temperature
);
692 passive_store(struct device
*dev
, struct device_attribute
*attr
,
693 const char *buf
, size_t count
)
695 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
696 struct thermal_cooling_device
*cdev
= NULL
;
699 if (!sscanf(buf
, "%d\n", &state
))
702 /* sanity check: values below 1000 millicelcius don't make sense
703 * and can cause the system to go into a thermal heart attack
705 if (state
&& state
< 1000)
708 if (state
&& !tz
->forced_passive
) {
709 mutex_lock(&thermal_list_lock
);
710 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
711 if (!strncmp("Processor", cdev
->type
,
712 sizeof("Processor")))
713 thermal_zone_bind_cooling_device(tz
,
714 THERMAL_TRIPS_NONE
, cdev
,
718 mutex_unlock(&thermal_list_lock
);
719 if (!tz
->passive_delay
)
720 tz
->passive_delay
= 1000;
721 } else if (!state
&& tz
->forced_passive
) {
722 mutex_lock(&thermal_list_lock
);
723 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
724 if (!strncmp("Processor", cdev
->type
,
725 sizeof("Processor")))
726 thermal_zone_unbind_cooling_device(tz
,
730 mutex_unlock(&thermal_list_lock
);
731 tz
->passive_delay
= 0;
734 tz
->forced_passive
= state
;
736 thermal_zone_device_update(tz
);
742 passive_show(struct device
*dev
, struct device_attribute
*attr
,
745 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
747 return sprintf(buf
, "%d\n", tz
->forced_passive
);
751 policy_store(struct device
*dev
, struct device_attribute
*attr
,
752 const char *buf
, size_t count
)
755 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
756 struct thermal_governor
*gov
;
757 char name
[THERMAL_NAME_LENGTH
];
759 snprintf(name
, sizeof(name
), "%s", buf
);
761 mutex_lock(&thermal_governor_lock
);
762 mutex_lock(&tz
->lock
);
764 gov
= __find_governor(strim(name
));
772 mutex_unlock(&tz
->lock
);
773 mutex_unlock(&thermal_governor_lock
);
778 policy_show(struct device
*dev
, struct device_attribute
*devattr
, char *buf
)
780 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
782 return sprintf(buf
, "%s\n", tz
->governor
->name
);
785 #ifdef CONFIG_THERMAL_EMULATION
787 emul_temp_store(struct device
*dev
, struct device_attribute
*attr
,
788 const char *buf
, size_t count
)
790 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
792 unsigned long temperature
;
794 if (kstrtoul(buf
, 10, &temperature
))
797 if (!tz
->ops
->set_emul_temp
) {
798 mutex_lock(&tz
->lock
);
799 tz
->emul_temperature
= temperature
;
800 mutex_unlock(&tz
->lock
);
802 ret
= tz
->ops
->set_emul_temp(tz
, temperature
);
806 thermal_zone_device_update(tz
);
808 return ret
? ret
: count
;
810 static DEVICE_ATTR(emul_temp
, S_IWUSR
, NULL
, emul_temp_store
);
811 #endif/*CONFIG_THERMAL_EMULATION*/
813 static DEVICE_ATTR(type
, 0444, type_show
, NULL
);
814 static DEVICE_ATTR(temp
, 0444, temp_show
, NULL
);
815 static DEVICE_ATTR(mode
, 0644, mode_show
, mode_store
);
816 static DEVICE_ATTR(passive
, S_IRUGO
| S_IWUSR
, passive_show
, passive_store
);
817 static DEVICE_ATTR(policy
, S_IRUGO
| S_IWUSR
, policy_show
, policy_store
);
819 /* sys I/F for cooling device */
820 #define to_cooling_device(_dev) \
821 container_of(_dev, struct thermal_cooling_device, device)
824 thermal_cooling_device_type_show(struct device
*dev
,
825 struct device_attribute
*attr
, char *buf
)
827 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
829 return sprintf(buf
, "%s\n", cdev
->type
);
833 thermal_cooling_device_max_state_show(struct device
*dev
,
834 struct device_attribute
*attr
, char *buf
)
836 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
840 ret
= cdev
->ops
->get_max_state(cdev
, &state
);
843 return sprintf(buf
, "%ld\n", state
);
847 thermal_cooling_device_cur_state_show(struct device
*dev
,
848 struct device_attribute
*attr
, char *buf
)
850 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
854 ret
= cdev
->ops
->get_cur_state(cdev
, &state
);
857 return sprintf(buf
, "%ld\n", state
);
861 thermal_cooling_device_cur_state_store(struct device
*dev
,
862 struct device_attribute
*attr
,
863 const char *buf
, size_t count
)
865 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
869 if (!sscanf(buf
, "%ld\n", &state
))
875 result
= cdev
->ops
->set_cur_state(cdev
, state
);
881 static struct device_attribute dev_attr_cdev_type
=
882 __ATTR(type
, 0444, thermal_cooling_device_type_show
, NULL
);
883 static DEVICE_ATTR(max_state
, 0444,
884 thermal_cooling_device_max_state_show
, NULL
);
885 static DEVICE_ATTR(cur_state
, 0644,
886 thermal_cooling_device_cur_state_show
,
887 thermal_cooling_device_cur_state_store
);
890 thermal_cooling_device_trip_point_show(struct device
*dev
,
891 struct device_attribute
*attr
, char *buf
)
893 struct thermal_instance
*instance
;
896 container_of(attr
, struct thermal_instance
, attr
);
898 if (instance
->trip
== THERMAL_TRIPS_NONE
)
899 return sprintf(buf
, "-1\n");
901 return sprintf(buf
, "%d\n", instance
->trip
);
904 static struct attribute
*cooling_device_attrs
[] = {
905 &dev_attr_cdev_type
.attr
,
906 &dev_attr_max_state
.attr
,
907 &dev_attr_cur_state
.attr
,
911 static const struct attribute_group cooling_device_attr_group
= {
912 .attrs
= cooling_device_attrs
,
915 static const struct attribute_group
*cooling_device_attr_groups
[] = {
916 &cooling_device_attr_group
,
920 /* Device management */
923 * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
924 * @tz: pointer to struct thermal_zone_device
925 * @trip: indicates which trip point the cooling devices is
926 * associated with in this thermal zone.
927 * @cdev: pointer to struct thermal_cooling_device
928 * @upper: the Maximum cooling state for this trip point.
929 * THERMAL_NO_LIMIT means no upper limit,
930 * and the cooling device can be in max_state.
931 * @lower: the Minimum cooling state can be used for this trip point.
932 * THERMAL_NO_LIMIT means no lower limit,
933 * and the cooling device can be in cooling state 0.
935 * This interface function bind a thermal cooling device to the certain trip
936 * point of a thermal zone device.
937 * This function is usually called in the thermal zone device .bind callback.
939 * Return: 0 on success, the proper error value otherwise.
941 int thermal_zone_bind_cooling_device(struct thermal_zone_device
*tz
,
943 struct thermal_cooling_device
*cdev
,
944 unsigned long upper
, unsigned long lower
)
946 struct thermal_instance
*dev
;
947 struct thermal_instance
*pos
;
948 struct thermal_zone_device
*pos1
;
949 struct thermal_cooling_device
*pos2
;
950 unsigned long max_state
;
953 if (trip
>= tz
->trips
|| (trip
< 0 && trip
!= THERMAL_TRIPS_NONE
))
956 list_for_each_entry(pos1
, &thermal_tz_list
, node
) {
960 list_for_each_entry(pos2
, &thermal_cdev_list
, node
) {
965 if (tz
!= pos1
|| cdev
!= pos2
)
968 ret
= cdev
->ops
->get_max_state(cdev
, &max_state
);
972 /* lower default 0, upper default max_state */
973 lower
= lower
== THERMAL_NO_LIMIT
? 0 : lower
;
974 upper
= upper
== THERMAL_NO_LIMIT
? max_state
: upper
;
976 if (lower
> upper
|| upper
> max_state
)
980 kzalloc(sizeof(struct thermal_instance
), GFP_KERNEL
);
988 dev
->target
= THERMAL_NO_TARGET
;
990 result
= get_idr(&tz
->idr
, &tz
->lock
, &dev
->id
);
994 sprintf(dev
->name
, "cdev%d", dev
->id
);
996 sysfs_create_link(&tz
->device
.kobj
, &cdev
->device
.kobj
, dev
->name
);
1000 sprintf(dev
->attr_name
, "cdev%d_trip_point", dev
->id
);
1001 sysfs_attr_init(&dev
->attr
.attr
);
1002 dev
->attr
.attr
.name
= dev
->attr_name
;
1003 dev
->attr
.attr
.mode
= 0444;
1004 dev
->attr
.show
= thermal_cooling_device_trip_point_show
;
1005 result
= device_create_file(&tz
->device
, &dev
->attr
);
1007 goto remove_symbol_link
;
1009 mutex_lock(&tz
->lock
);
1010 mutex_lock(&cdev
->lock
);
1011 list_for_each_entry(pos
, &tz
->thermal_instances
, tz_node
)
1012 if (pos
->tz
== tz
&& pos
->trip
== trip
&& pos
->cdev
== cdev
) {
1017 list_add_tail(&dev
->tz_node
, &tz
->thermal_instances
);
1018 list_add_tail(&dev
->cdev_node
, &cdev
->thermal_instances
);
1020 mutex_unlock(&cdev
->lock
);
1021 mutex_unlock(&tz
->lock
);
1026 device_remove_file(&tz
->device
, &dev
->attr
);
1028 sysfs_remove_link(&tz
->device
.kobj
, dev
->name
);
1030 release_idr(&tz
->idr
, &tz
->lock
, dev
->id
);
1035 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device
);
1038 * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1040 * @tz: pointer to a struct thermal_zone_device.
1041 * @trip: indicates which trip point the cooling devices is
1042 * associated with in this thermal zone.
1043 * @cdev: pointer to a struct thermal_cooling_device.
1045 * This interface function unbind a thermal cooling device from the certain
1046 * trip point of a thermal zone device.
1047 * This function is usually called in the thermal zone device .unbind callback.
1049 * Return: 0 on success, the proper error value otherwise.
1051 int thermal_zone_unbind_cooling_device(struct thermal_zone_device
*tz
,
1053 struct thermal_cooling_device
*cdev
)
1055 struct thermal_instance
*pos
, *next
;
1057 mutex_lock(&tz
->lock
);
1058 mutex_lock(&cdev
->lock
);
1059 list_for_each_entry_safe(pos
, next
, &tz
->thermal_instances
, tz_node
) {
1060 if (pos
->tz
== tz
&& pos
->trip
== trip
&& pos
->cdev
== cdev
) {
1061 list_del(&pos
->tz_node
);
1062 list_del(&pos
->cdev_node
);
1063 mutex_unlock(&cdev
->lock
);
1064 mutex_unlock(&tz
->lock
);
1068 mutex_unlock(&cdev
->lock
);
1069 mutex_unlock(&tz
->lock
);
1074 device_remove_file(&tz
->device
, &pos
->attr
);
1075 sysfs_remove_link(&tz
->device
.kobj
, pos
->name
);
1076 release_idr(&tz
->idr
, &tz
->lock
, pos
->id
);
1080 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device
);
1082 static void thermal_release(struct device
*dev
)
1084 struct thermal_zone_device
*tz
;
1085 struct thermal_cooling_device
*cdev
;
1087 if (!strncmp(dev_name(dev
), "thermal_zone",
1088 sizeof("thermal_zone") - 1)) {
1089 tz
= to_thermal_zone(dev
);
1091 } else if(!strncmp(dev_name(dev
), "cooling_device",
1092 sizeof("cooling_device") - 1)){
1093 cdev
= to_cooling_device(dev
);
1098 static struct class thermal_class
= {
1100 .dev_release
= thermal_release
,
1104 * __thermal_cooling_device_register() - register a new thermal cooling device
1105 * @np: a pointer to a device tree node.
1106 * @type: the thermal cooling device type.
1107 * @devdata: device private data.
1108 * @ops: standard thermal cooling devices callbacks.
1110 * This interface function adds a new thermal cooling device (fan/processor/...)
1111 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1112 * to all the thermal zone devices registered at the same time.
1113 * It also gives the opportunity to link the cooling device to a device tree
1114 * node, so that it can be bound to a thermal zone created out of device tree.
1116 * Return: a pointer to the created struct thermal_cooling_device or an
1117 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1119 static struct thermal_cooling_device
*
1120 __thermal_cooling_device_register(struct device_node
*np
,
1121 char *type
, void *devdata
,
1122 const struct thermal_cooling_device_ops
*ops
)
1124 struct thermal_cooling_device
*cdev
;
1127 if (type
&& strlen(type
) >= THERMAL_NAME_LENGTH
)
1128 return ERR_PTR(-EINVAL
);
1130 if (!ops
|| !ops
->get_max_state
|| !ops
->get_cur_state
||
1131 !ops
->set_cur_state
)
1132 return ERR_PTR(-EINVAL
);
1134 cdev
= kzalloc(sizeof(struct thermal_cooling_device
), GFP_KERNEL
);
1136 return ERR_PTR(-ENOMEM
);
1138 result
= get_idr(&thermal_cdev_idr
, &thermal_idr_lock
, &cdev
->id
);
1141 return ERR_PTR(result
);
1144 strlcpy(cdev
->type
, type
? : "", sizeof(cdev
->type
));
1145 mutex_init(&cdev
->lock
);
1146 INIT_LIST_HEAD(&cdev
->thermal_instances
);
1149 cdev
->updated
= false;
1150 cdev
->device
.class = &thermal_class
;
1151 cdev
->device
.groups
= cooling_device_attr_groups
;
1152 cdev
->devdata
= devdata
;
1153 dev_set_name(&cdev
->device
, "cooling_device%d", cdev
->id
);
1154 result
= device_register(&cdev
->device
);
1156 release_idr(&thermal_cdev_idr
, &thermal_idr_lock
, cdev
->id
);
1158 return ERR_PTR(result
);
1161 /* Add 'this' new cdev to the global cdev list */
1162 mutex_lock(&thermal_list_lock
);
1163 list_add(&cdev
->node
, &thermal_cdev_list
);
1164 mutex_unlock(&thermal_list_lock
);
1166 /* Update binding information for 'this' new cdev */
1173 * thermal_cooling_device_register() - register a new thermal cooling device
1174 * @type: the thermal cooling device type.
1175 * @devdata: device private data.
1176 * @ops: standard thermal cooling devices callbacks.
1178 * This interface function adds a new thermal cooling device (fan/processor/...)
1179 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1180 * to all the thermal zone devices registered at the same time.
1182 * Return: a pointer to the created struct thermal_cooling_device or an
1183 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1185 struct thermal_cooling_device
*
1186 thermal_cooling_device_register(char *type
, void *devdata
,
1187 const struct thermal_cooling_device_ops
*ops
)
1189 return __thermal_cooling_device_register(NULL
, type
, devdata
, ops
);
1191 EXPORT_SYMBOL_GPL(thermal_cooling_device_register
);
1194 * thermal_of_cooling_device_register() - register an OF thermal cooling device
1195 * @np: a pointer to a device tree node.
1196 * @type: the thermal cooling device type.
1197 * @devdata: device private data.
1198 * @ops: standard thermal cooling devices callbacks.
1200 * This function will register a cooling device with device tree node reference.
1201 * This interface function adds a new thermal cooling device (fan/processor/...)
1202 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1203 * to all the thermal zone devices registered at the same time.
1205 * Return: a pointer to the created struct thermal_cooling_device or an
1206 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1208 struct thermal_cooling_device
*
1209 thermal_of_cooling_device_register(struct device_node
*np
,
1210 char *type
, void *devdata
,
1211 const struct thermal_cooling_device_ops
*ops
)
1213 return __thermal_cooling_device_register(np
, type
, devdata
, ops
);
1215 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register
);
1218 * thermal_cooling_device_unregister - removes the registered thermal cooling device
1219 * @cdev: the thermal cooling device to remove.
1221 * thermal_cooling_device_unregister() must be called when the device is no
1224 void thermal_cooling_device_unregister(struct thermal_cooling_device
*cdev
)
1227 const struct thermal_zone_params
*tzp
;
1228 struct thermal_zone_device
*tz
;
1229 struct thermal_cooling_device
*pos
= NULL
;
1234 mutex_lock(&thermal_list_lock
);
1235 list_for_each_entry(pos
, &thermal_cdev_list
, node
)
1239 /* thermal cooling device not found */
1240 mutex_unlock(&thermal_list_lock
);
1243 list_del(&cdev
->node
);
1245 /* Unbind all thermal zones associated with 'this' cdev */
1246 list_for_each_entry(tz
, &thermal_tz_list
, node
) {
1247 if (tz
->ops
->unbind
) {
1248 tz
->ops
->unbind(tz
, cdev
);
1252 if (!tz
->tzp
|| !tz
->tzp
->tbp
)
1256 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
1257 if (tzp
->tbp
[i
].cdev
== cdev
) {
1258 __unbind(tz
, tzp
->tbp
[i
].trip_mask
, cdev
);
1259 tzp
->tbp
[i
].cdev
= NULL
;
1264 mutex_unlock(&thermal_list_lock
);
1267 device_remove_file(&cdev
->device
, &dev_attr_cdev_type
);
1268 device_remove_file(&cdev
->device
, &dev_attr_max_state
);
1269 device_remove_file(&cdev
->device
, &dev_attr_cur_state
);
1271 release_idr(&thermal_cdev_idr
, &thermal_idr_lock
, cdev
->id
);
1272 device_unregister(&cdev
->device
);
1275 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister
);
1277 void thermal_cdev_update(struct thermal_cooling_device
*cdev
)
1279 struct thermal_instance
*instance
;
1280 unsigned long target
= 0;
1282 /* cooling device is updated*/
1286 mutex_lock(&cdev
->lock
);
1287 /* Make sure cdev enters the deepest cooling state */
1288 list_for_each_entry(instance
, &cdev
->thermal_instances
, cdev_node
) {
1289 dev_dbg(&cdev
->device
, "zone%d->target=%lu\n",
1290 instance
->tz
->id
, instance
->target
);
1291 if (instance
->target
== THERMAL_NO_TARGET
)
1293 if (instance
->target
> target
)
1294 target
= instance
->target
;
1296 mutex_unlock(&cdev
->lock
);
1297 cdev
->ops
->set_cur_state(cdev
, target
);
1298 cdev
->updated
= true;
1299 trace_cdev_update(cdev
, target
);
1300 dev_dbg(&cdev
->device
, "set to state %lu\n", target
);
1302 EXPORT_SYMBOL(thermal_cdev_update
);
1305 * thermal_notify_framework - Sensor drivers use this API to notify framework
1306 * @tz: thermal zone device
1307 * @trip: indicates which trip point has been crossed
1309 * This function handles the trip events from sensor drivers. It starts
1310 * throttling the cooling devices according to the policy configured.
1311 * For CRITICAL and HOT trip points, this notifies the respective drivers,
1312 * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1313 * The throttling policy is based on the configured platform data; if no
1314 * platform data is provided, this uses the step_wise throttling policy.
1316 void thermal_notify_framework(struct thermal_zone_device
*tz
, int trip
)
1318 handle_thermal_trip(tz
, trip
);
1320 EXPORT_SYMBOL_GPL(thermal_notify_framework
);
1323 * create_trip_attrs() - create attributes for trip points
1324 * @tz: the thermal zone device
1325 * @mask: Writeable trip point bitmap.
1327 * helper function to instantiate sysfs entries for every trip
1328 * point and its properties of a struct thermal_zone_device.
1330 * Return: 0 on success, the proper error value otherwise.
1332 static int create_trip_attrs(struct thermal_zone_device
*tz
, int mask
)
1335 int size
= sizeof(struct thermal_attr
) * tz
->trips
;
1337 tz
->trip_type_attrs
= kzalloc(size
, GFP_KERNEL
);
1338 if (!tz
->trip_type_attrs
)
1341 tz
->trip_temp_attrs
= kzalloc(size
, GFP_KERNEL
);
1342 if (!tz
->trip_temp_attrs
) {
1343 kfree(tz
->trip_type_attrs
);
1347 if (tz
->ops
->get_trip_hyst
) {
1348 tz
->trip_hyst_attrs
= kzalloc(size
, GFP_KERNEL
);
1349 if (!tz
->trip_hyst_attrs
) {
1350 kfree(tz
->trip_type_attrs
);
1351 kfree(tz
->trip_temp_attrs
);
1357 for (indx
= 0; indx
< tz
->trips
; indx
++) {
1358 /* create trip type attribute */
1359 snprintf(tz
->trip_type_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1360 "trip_point_%d_type", indx
);
1362 sysfs_attr_init(&tz
->trip_type_attrs
[indx
].attr
.attr
);
1363 tz
->trip_type_attrs
[indx
].attr
.attr
.name
=
1364 tz
->trip_type_attrs
[indx
].name
;
1365 tz
->trip_type_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1366 tz
->trip_type_attrs
[indx
].attr
.show
= trip_point_type_show
;
1368 device_create_file(&tz
->device
,
1369 &tz
->trip_type_attrs
[indx
].attr
);
1371 /* create trip temp attribute */
1372 snprintf(tz
->trip_temp_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1373 "trip_point_%d_temp", indx
);
1375 sysfs_attr_init(&tz
->trip_temp_attrs
[indx
].attr
.attr
);
1376 tz
->trip_temp_attrs
[indx
].attr
.attr
.name
=
1377 tz
->trip_temp_attrs
[indx
].name
;
1378 tz
->trip_temp_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1379 tz
->trip_temp_attrs
[indx
].attr
.show
= trip_point_temp_show
;
1380 if (mask
& (1 << indx
)) {
1381 tz
->trip_temp_attrs
[indx
].attr
.attr
.mode
|= S_IWUSR
;
1382 tz
->trip_temp_attrs
[indx
].attr
.store
=
1383 trip_point_temp_store
;
1386 device_create_file(&tz
->device
,
1387 &tz
->trip_temp_attrs
[indx
].attr
);
1389 /* create Optional trip hyst attribute */
1390 if (!tz
->ops
->get_trip_hyst
)
1392 snprintf(tz
->trip_hyst_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1393 "trip_point_%d_hyst", indx
);
1395 sysfs_attr_init(&tz
->trip_hyst_attrs
[indx
].attr
.attr
);
1396 tz
->trip_hyst_attrs
[indx
].attr
.attr
.name
=
1397 tz
->trip_hyst_attrs
[indx
].name
;
1398 tz
->trip_hyst_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1399 tz
->trip_hyst_attrs
[indx
].attr
.show
= trip_point_hyst_show
;
1400 if (tz
->ops
->set_trip_hyst
) {
1401 tz
->trip_hyst_attrs
[indx
].attr
.attr
.mode
|= S_IWUSR
;
1402 tz
->trip_hyst_attrs
[indx
].attr
.store
=
1403 trip_point_hyst_store
;
1406 device_create_file(&tz
->device
,
1407 &tz
->trip_hyst_attrs
[indx
].attr
);
1412 static void remove_trip_attrs(struct thermal_zone_device
*tz
)
1416 for (indx
= 0; indx
< tz
->trips
; indx
++) {
1417 device_remove_file(&tz
->device
,
1418 &tz
->trip_type_attrs
[indx
].attr
);
1419 device_remove_file(&tz
->device
,
1420 &tz
->trip_temp_attrs
[indx
].attr
);
1421 if (tz
->ops
->get_trip_hyst
)
1422 device_remove_file(&tz
->device
,
1423 &tz
->trip_hyst_attrs
[indx
].attr
);
1425 kfree(tz
->trip_type_attrs
);
1426 kfree(tz
->trip_temp_attrs
);
1427 kfree(tz
->trip_hyst_attrs
);
1431 * thermal_zone_device_register() - register a new thermal zone device
1432 * @type: the thermal zone device type
1433 * @trips: the number of trip points the thermal zone support
1434 * @mask: a bit string indicating the writeablility of trip points
1435 * @devdata: private device data
1436 * @ops: standard thermal zone device callbacks
1437 * @tzp: thermal zone platform parameters
1438 * @passive_delay: number of milliseconds to wait between polls when
1439 * performing passive cooling
1440 * @polling_delay: number of milliseconds to wait between polls when checking
1441 * whether trip points have been crossed (0 for interrupt
1444 * This interface function adds a new thermal zone device (sensor) to
1445 * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1446 * thermal cooling devices registered at the same time.
1447 * thermal_zone_device_unregister() must be called when the device is no
1448 * longer needed. The passive cooling depends on the .get_trend() return value.
1450 * Return: a pointer to the created struct thermal_zone_device or an
1451 * in case of error, an ERR_PTR. Caller must check return value with
1452 * IS_ERR*() helpers.
1454 struct thermal_zone_device
*thermal_zone_device_register(const char *type
,
1455 int trips
, int mask
, void *devdata
,
1456 struct thermal_zone_device_ops
*ops
,
1457 const struct thermal_zone_params
*tzp
,
1458 int passive_delay
, int polling_delay
)
1460 struct thermal_zone_device
*tz
;
1461 enum thermal_trip_type trip_type
;
1466 if (type
&& strlen(type
) >= THERMAL_NAME_LENGTH
)
1467 return ERR_PTR(-EINVAL
);
1469 if (trips
> THERMAL_MAX_TRIPS
|| trips
< 0 || mask
>> trips
)
1470 return ERR_PTR(-EINVAL
);
1473 return ERR_PTR(-EINVAL
);
1475 if (trips
> 0 && (!ops
->get_trip_type
|| !ops
->get_trip_temp
))
1476 return ERR_PTR(-EINVAL
);
1478 tz
= kzalloc(sizeof(struct thermal_zone_device
), GFP_KERNEL
);
1480 return ERR_PTR(-ENOMEM
);
1482 INIT_LIST_HEAD(&tz
->thermal_instances
);
1484 mutex_init(&tz
->lock
);
1485 result
= get_idr(&thermal_tz_idr
, &thermal_idr_lock
, &tz
->id
);
1488 return ERR_PTR(result
);
1491 strlcpy(tz
->type
, type
? : "", sizeof(tz
->type
));
1494 tz
->device
.class = &thermal_class
;
1495 tz
->devdata
= devdata
;
1497 tz
->passive_delay
= passive_delay
;
1498 tz
->polling_delay
= polling_delay
;
1500 dev_set_name(&tz
->device
, "thermal_zone%d", tz
->id
);
1501 result
= device_register(&tz
->device
);
1503 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
1505 return ERR_PTR(result
);
1510 result
= device_create_file(&tz
->device
, &dev_attr_type
);
1515 result
= device_create_file(&tz
->device
, &dev_attr_temp
);
1519 if (ops
->get_mode
) {
1520 result
= device_create_file(&tz
->device
, &dev_attr_mode
);
1525 result
= create_trip_attrs(tz
, mask
);
1529 for (count
= 0; count
< trips
; count
++) {
1530 tz
->ops
->get_trip_type(tz
, count
, &trip_type
);
1531 if (trip_type
== THERMAL_TRIP_PASSIVE
)
1536 result
= device_create_file(&tz
->device
, &dev_attr_passive
);
1541 #ifdef CONFIG_THERMAL_EMULATION
1542 result
= device_create_file(&tz
->device
, &dev_attr_emul_temp
);
1546 /* Create policy attribute */
1547 result
= device_create_file(&tz
->device
, &dev_attr_policy
);
1551 /* Update 'this' zone's governor information */
1552 mutex_lock(&thermal_governor_lock
);
1555 tz
->governor
= __find_governor(tz
->tzp
->governor_name
);
1557 tz
->governor
= def_governor
;
1559 mutex_unlock(&thermal_governor_lock
);
1561 if (!tz
->tzp
|| !tz
->tzp
->no_hwmon
) {
1562 result
= thermal_add_hwmon_sysfs(tz
);
1567 mutex_lock(&thermal_list_lock
);
1568 list_add_tail(&tz
->node
, &thermal_tz_list
);
1569 mutex_unlock(&thermal_list_lock
);
1571 /* Bind cooling devices for this zone */
1574 INIT_DELAYED_WORK(&(tz
->poll_queue
), thermal_zone_device_check
);
1576 if (!tz
->ops
->get_temp
)
1577 thermal_zone_device_set_polling(tz
, 0);
1579 thermal_zone_device_update(tz
);
1584 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
1585 device_unregister(&tz
->device
);
1586 return ERR_PTR(result
);
1588 EXPORT_SYMBOL_GPL(thermal_zone_device_register
);
1591 * thermal_device_unregister - removes the registered thermal zone device
1592 * @tz: the thermal zone device to remove
1594 void thermal_zone_device_unregister(struct thermal_zone_device
*tz
)
1597 const struct thermal_zone_params
*tzp
;
1598 struct thermal_cooling_device
*cdev
;
1599 struct thermal_zone_device
*pos
= NULL
;
1606 mutex_lock(&thermal_list_lock
);
1607 list_for_each_entry(pos
, &thermal_tz_list
, node
)
1611 /* thermal zone device not found */
1612 mutex_unlock(&thermal_list_lock
);
1615 list_del(&tz
->node
);
1617 /* Unbind all cdevs associated with 'this' thermal zone */
1618 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
1619 if (tz
->ops
->unbind
) {
1620 tz
->ops
->unbind(tz
, cdev
);
1624 if (!tzp
|| !tzp
->tbp
)
1627 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
1628 if (tzp
->tbp
[i
].cdev
== cdev
) {
1629 __unbind(tz
, tzp
->tbp
[i
].trip_mask
, cdev
);
1630 tzp
->tbp
[i
].cdev
= NULL
;
1635 mutex_unlock(&thermal_list_lock
);
1637 thermal_zone_device_set_polling(tz
, 0);
1640 device_remove_file(&tz
->device
, &dev_attr_type
);
1641 device_remove_file(&tz
->device
, &dev_attr_temp
);
1642 if (tz
->ops
->get_mode
)
1643 device_remove_file(&tz
->device
, &dev_attr_mode
);
1644 device_remove_file(&tz
->device
, &dev_attr_policy
);
1645 remove_trip_attrs(tz
);
1646 tz
->governor
= NULL
;
1648 thermal_remove_hwmon_sysfs(tz
);
1649 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
1650 idr_destroy(&tz
->idr
);
1651 mutex_destroy(&tz
->lock
);
1652 device_unregister(&tz
->device
);
1655 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister
);
1658 * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1659 * @name: thermal zone name to fetch the temperature
1661 * When only one zone is found with the passed name, returns a reference to it.
1663 * Return: On success returns a reference to an unique thermal zone with
1664 * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1665 * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1667 struct thermal_zone_device
*thermal_zone_get_zone_by_name(const char *name
)
1669 struct thermal_zone_device
*pos
= NULL
, *ref
= ERR_PTR(-EINVAL
);
1670 unsigned int found
= 0;
1675 mutex_lock(&thermal_list_lock
);
1676 list_for_each_entry(pos
, &thermal_tz_list
, node
)
1677 if (!strncasecmp(name
, pos
->type
, THERMAL_NAME_LENGTH
)) {
1681 mutex_unlock(&thermal_list_lock
);
1683 /* nothing has been found, thus an error code for it */
1685 ref
= ERR_PTR(-ENODEV
);
1687 /* Success only when an unique zone is found */
1688 ref
= ERR_PTR(-EEXIST
);
1693 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name
);
1696 static const struct genl_multicast_group thermal_event_mcgrps
[] = {
1697 { .name
= THERMAL_GENL_MCAST_GROUP_NAME
, },
1700 static struct genl_family thermal_event_genl_family
= {
1701 .id
= GENL_ID_GENERATE
,
1702 .name
= THERMAL_GENL_FAMILY_NAME
,
1703 .version
= THERMAL_GENL_VERSION
,
1704 .maxattr
= THERMAL_GENL_ATTR_MAX
,
1705 .mcgrps
= thermal_event_mcgrps
,
1706 .n_mcgrps
= ARRAY_SIZE(thermal_event_mcgrps
),
1709 int thermal_generate_netlink_event(struct thermal_zone_device
*tz
,
1712 struct sk_buff
*skb
;
1713 struct nlattr
*attr
;
1714 struct thermal_genl_event
*thermal_event
;
1718 static unsigned int thermal_event_seqnum
;
1723 /* allocate memory */
1724 size
= nla_total_size(sizeof(struct thermal_genl_event
)) +
1727 skb
= genlmsg_new(size
, GFP_ATOMIC
);
1731 /* add the genetlink message header */
1732 msg_header
= genlmsg_put(skb
, 0, thermal_event_seqnum
++,
1733 &thermal_event_genl_family
, 0,
1734 THERMAL_GENL_CMD_EVENT
);
1741 attr
= nla_reserve(skb
, THERMAL_GENL_ATTR_EVENT
,
1742 sizeof(struct thermal_genl_event
));
1749 thermal_event
= nla_data(attr
);
1750 if (!thermal_event
) {
1755 memset(thermal_event
, 0, sizeof(struct thermal_genl_event
));
1757 thermal_event
->orig
= tz
->id
;
1758 thermal_event
->event
= event
;
1760 /* send multicast genetlink message */
1761 genlmsg_end(skb
, msg_header
);
1763 result
= genlmsg_multicast(&thermal_event_genl_family
, skb
, 0,
1766 dev_err(&tz
->device
, "Failed to send netlink event:%d", result
);
1770 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event
);
1772 static int genetlink_init(void)
1774 return genl_register_family(&thermal_event_genl_family
);
1777 static void genetlink_exit(void)
1779 genl_unregister_family(&thermal_event_genl_family
);
1781 #else /* !CONFIG_NET */
1782 static inline int genetlink_init(void) { return 0; }
1783 static inline void genetlink_exit(void) {}
1784 #endif /* !CONFIG_NET */
1786 static int __init
thermal_register_governors(void)
1790 result
= thermal_gov_step_wise_register();
1794 result
= thermal_gov_fair_share_register();
1798 result
= thermal_gov_bang_bang_register();
1802 return thermal_gov_user_space_register();
1805 static void thermal_unregister_governors(void)
1807 thermal_gov_step_wise_unregister();
1808 thermal_gov_fair_share_unregister();
1809 thermal_gov_bang_bang_unregister();
1810 thermal_gov_user_space_unregister();
1813 static int __init
thermal_init(void)
1817 result
= thermal_register_governors();
1821 result
= class_register(&thermal_class
);
1823 goto unregister_governors
;
1825 result
= genetlink_init();
1827 goto unregister_class
;
1829 result
= of_parse_thermal_zones();
1838 class_unregister(&thermal_class
);
1839 unregister_governors
:
1840 thermal_unregister_governors();
1842 idr_destroy(&thermal_tz_idr
);
1843 idr_destroy(&thermal_cdev_idr
);
1844 mutex_destroy(&thermal_idr_lock
);
1845 mutex_destroy(&thermal_list_lock
);
1846 mutex_destroy(&thermal_governor_lock
);
1850 static void __exit
thermal_exit(void)
1852 of_thermal_destroy_zones();
1854 class_unregister(&thermal_class
);
1855 thermal_unregister_governors();
1856 idr_destroy(&thermal_tz_idr
);
1857 idr_destroy(&thermal_cdev_idr
);
1858 mutex_destroy(&thermal_idr_lock
);
1859 mutex_destroy(&thermal_list_lock
);
1860 mutex_destroy(&thermal_governor_lock
);
1863 fs_initcall(thermal_init
);
1864 module_exit(thermal_exit
);