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>
40 #include <linux/suspend.h>
42 #define CREATE_TRACE_POINTS
43 #include <trace/events/thermal.h>
45 #include "thermal_core.h"
46 #include "thermal_hwmon.h"
48 MODULE_AUTHOR("Zhang Rui");
49 MODULE_DESCRIPTION("Generic thermal management sysfs support");
50 MODULE_LICENSE("GPL v2");
52 static DEFINE_IDR(thermal_tz_idr
);
53 static DEFINE_IDR(thermal_cdev_idr
);
54 static DEFINE_MUTEX(thermal_idr_lock
);
56 static LIST_HEAD(thermal_tz_list
);
57 static LIST_HEAD(thermal_cdev_list
);
58 static LIST_HEAD(thermal_governor_list
);
60 static DEFINE_MUTEX(thermal_list_lock
);
61 static DEFINE_MUTEX(thermal_governor_lock
);
63 static atomic_t in_suspend
;
65 static struct thermal_governor
*def_governor
;
67 static struct thermal_governor
*__find_governor(const char *name
)
69 struct thermal_governor
*pos
;
71 if (!name
|| !name
[0])
74 list_for_each_entry(pos
, &thermal_governor_list
, governor_list
)
75 if (!strncasecmp(name
, pos
->name
, THERMAL_NAME_LENGTH
))
82 * bind_previous_governor() - bind the previous governor of the thermal zone
83 * @tz: a valid pointer to a struct thermal_zone_device
84 * @failed_gov_name: the name of the governor that failed to register
86 * Register the previous governor of the thermal zone after a new
87 * governor has failed to be bound.
89 static void bind_previous_governor(struct thermal_zone_device
*tz
,
90 const char *failed_gov_name
)
92 if (tz
->governor
&& tz
->governor
->bind_to_tz
) {
93 if (tz
->governor
->bind_to_tz(tz
)) {
95 "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n",
96 failed_gov_name
, tz
->governor
->name
, tz
->type
);
103 * thermal_set_governor() - Switch to another governor
104 * @tz: a valid pointer to a struct thermal_zone_device
105 * @new_gov: pointer to the new governor
107 * Change the governor of thermal zone @tz.
109 * Return: 0 on success, an error if the new governor's bind_to_tz() failed.
111 static int thermal_set_governor(struct thermal_zone_device
*tz
,
112 struct thermal_governor
*new_gov
)
116 if (tz
->governor
&& tz
->governor
->unbind_from_tz
)
117 tz
->governor
->unbind_from_tz(tz
);
119 if (new_gov
&& new_gov
->bind_to_tz
) {
120 ret
= new_gov
->bind_to_tz(tz
);
122 bind_previous_governor(tz
, new_gov
->name
);
128 tz
->governor
= new_gov
;
133 int thermal_register_governor(struct thermal_governor
*governor
)
137 struct thermal_zone_device
*pos
;
142 mutex_lock(&thermal_governor_lock
);
145 if (__find_governor(governor
->name
) == NULL
) {
147 list_add(&governor
->governor_list
, &thermal_governor_list
);
148 if (!def_governor
&& !strncmp(governor
->name
,
149 DEFAULT_THERMAL_GOVERNOR
, THERMAL_NAME_LENGTH
))
150 def_governor
= governor
;
153 mutex_lock(&thermal_list_lock
);
155 list_for_each_entry(pos
, &thermal_tz_list
, node
) {
157 * only thermal zones with specified tz->tzp->governor_name
158 * may run with tz->govenor unset
163 name
= pos
->tzp
->governor_name
;
165 if (!strncasecmp(name
, governor
->name
, THERMAL_NAME_LENGTH
)) {
168 ret
= thermal_set_governor(pos
, governor
);
170 dev_err(&pos
->device
,
171 "Failed to set governor %s for thermal zone %s: %d\n",
172 governor
->name
, pos
->type
, ret
);
176 mutex_unlock(&thermal_list_lock
);
177 mutex_unlock(&thermal_governor_lock
);
182 void thermal_unregister_governor(struct thermal_governor
*governor
)
184 struct thermal_zone_device
*pos
;
189 mutex_lock(&thermal_governor_lock
);
191 if (__find_governor(governor
->name
) == NULL
)
194 mutex_lock(&thermal_list_lock
);
196 list_for_each_entry(pos
, &thermal_tz_list
, node
) {
197 if (!strncasecmp(pos
->governor
->name
, governor
->name
,
198 THERMAL_NAME_LENGTH
))
199 thermal_set_governor(pos
, NULL
);
202 mutex_unlock(&thermal_list_lock
);
203 list_del(&governor
->governor_list
);
205 mutex_unlock(&thermal_governor_lock
);
209 static int get_idr(struct idr
*idr
, struct mutex
*lock
, int *id
)
215 ret
= idr_alloc(idr
, NULL
, 0, 0, GFP_KERNEL
);
218 if (unlikely(ret
< 0))
224 static void release_idr(struct idr
*idr
, struct mutex
*lock
, int id
)
233 int get_tz_trend(struct thermal_zone_device
*tz
, int trip
)
235 enum thermal_trend trend
;
237 if (tz
->emul_temperature
|| !tz
->ops
->get_trend
||
238 tz
->ops
->get_trend(tz
, trip
, &trend
)) {
239 if (tz
->temperature
> tz
->last_temperature
)
240 trend
= THERMAL_TREND_RAISING
;
241 else if (tz
->temperature
< tz
->last_temperature
)
242 trend
= THERMAL_TREND_DROPPING
;
244 trend
= THERMAL_TREND_STABLE
;
249 EXPORT_SYMBOL(get_tz_trend
);
251 struct thermal_instance
*get_thermal_instance(struct thermal_zone_device
*tz
,
252 struct thermal_cooling_device
*cdev
, int trip
)
254 struct thermal_instance
*pos
= NULL
;
255 struct thermal_instance
*target_instance
= NULL
;
257 mutex_lock(&tz
->lock
);
258 mutex_lock(&cdev
->lock
);
260 list_for_each_entry(pos
, &tz
->thermal_instances
, tz_node
) {
261 if (pos
->tz
== tz
&& pos
->trip
== trip
&& pos
->cdev
== cdev
) {
262 target_instance
= pos
;
267 mutex_unlock(&cdev
->lock
);
268 mutex_unlock(&tz
->lock
);
270 return target_instance
;
272 EXPORT_SYMBOL(get_thermal_instance
);
274 static void print_bind_err_msg(struct thermal_zone_device
*tz
,
275 struct thermal_cooling_device
*cdev
, int ret
)
277 dev_err(&tz
->device
, "binding zone %s with cdev %s failed:%d\n",
278 tz
->type
, cdev
->type
, ret
);
281 static void __bind(struct thermal_zone_device
*tz
, int mask
,
282 struct thermal_cooling_device
*cdev
,
283 unsigned long *limits
,
288 for (i
= 0; i
< tz
->trips
; i
++) {
289 if (mask
& (1 << i
)) {
290 unsigned long upper
, lower
;
292 upper
= THERMAL_NO_LIMIT
;
293 lower
= THERMAL_NO_LIMIT
;
295 lower
= limits
[i
* 2];
296 upper
= limits
[i
* 2 + 1];
298 ret
= thermal_zone_bind_cooling_device(tz
, i
, cdev
,
302 print_bind_err_msg(tz
, cdev
, ret
);
307 static void __unbind(struct thermal_zone_device
*tz
, int mask
,
308 struct thermal_cooling_device
*cdev
)
312 for (i
= 0; i
< tz
->trips
; i
++)
314 thermal_zone_unbind_cooling_device(tz
, i
, cdev
);
317 static void bind_cdev(struct thermal_cooling_device
*cdev
)
320 const struct thermal_zone_params
*tzp
;
321 struct thermal_zone_device
*pos
= NULL
;
323 mutex_lock(&thermal_list_lock
);
325 list_for_each_entry(pos
, &thermal_tz_list
, node
) {
326 if (!pos
->tzp
&& !pos
->ops
->bind
)
329 if (pos
->ops
->bind
) {
330 ret
= pos
->ops
->bind(pos
, cdev
);
332 print_bind_err_msg(pos
, cdev
, ret
);
337 if (!tzp
|| !tzp
->tbp
)
340 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
341 if (tzp
->tbp
[i
].cdev
|| !tzp
->tbp
[i
].match
)
343 if (tzp
->tbp
[i
].match(pos
, cdev
))
345 tzp
->tbp
[i
].cdev
= cdev
;
346 __bind(pos
, tzp
->tbp
[i
].trip_mask
, cdev
,
347 tzp
->tbp
[i
].binding_limits
,
352 mutex_unlock(&thermal_list_lock
);
355 static void bind_tz(struct thermal_zone_device
*tz
)
358 struct thermal_cooling_device
*pos
= NULL
;
359 const struct thermal_zone_params
*tzp
= tz
->tzp
;
361 if (!tzp
&& !tz
->ops
->bind
)
364 mutex_lock(&thermal_list_lock
);
366 /* If there is ops->bind, try to use ops->bind */
368 list_for_each_entry(pos
, &thermal_cdev_list
, node
) {
369 ret
= tz
->ops
->bind(tz
, pos
);
371 print_bind_err_msg(tz
, pos
, ret
);
376 if (!tzp
|| !tzp
->tbp
)
379 list_for_each_entry(pos
, &thermal_cdev_list
, node
) {
380 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
381 if (tzp
->tbp
[i
].cdev
|| !tzp
->tbp
[i
].match
)
383 if (tzp
->tbp
[i
].match(tz
, pos
))
385 tzp
->tbp
[i
].cdev
= pos
;
386 __bind(tz
, tzp
->tbp
[i
].trip_mask
, pos
,
387 tzp
->tbp
[i
].binding_limits
,
392 mutex_unlock(&thermal_list_lock
);
395 static void thermal_zone_device_set_polling(struct thermal_zone_device
*tz
,
399 mod_delayed_work(system_freezable_wq
, &tz
->poll_queue
,
400 round_jiffies(msecs_to_jiffies(delay
)));
402 mod_delayed_work(system_freezable_wq
, &tz
->poll_queue
,
403 msecs_to_jiffies(delay
));
405 cancel_delayed_work(&tz
->poll_queue
);
408 static void monitor_thermal_zone(struct thermal_zone_device
*tz
)
410 mutex_lock(&tz
->lock
);
413 thermal_zone_device_set_polling(tz
, tz
->passive_delay
);
414 else if (tz
->polling_delay
)
415 thermal_zone_device_set_polling(tz
, tz
->polling_delay
);
417 thermal_zone_device_set_polling(tz
, 0);
419 mutex_unlock(&tz
->lock
);
422 static void handle_non_critical_trips(struct thermal_zone_device
*tz
,
423 int trip
, enum thermal_trip_type trip_type
)
425 tz
->governor
? tz
->governor
->throttle(tz
, trip
) :
426 def_governor
->throttle(tz
, trip
);
429 static void handle_critical_trips(struct thermal_zone_device
*tz
,
430 int trip
, enum thermal_trip_type trip_type
)
434 tz
->ops
->get_trip_temp(tz
, trip
, &trip_temp
);
436 /* If we have not crossed the trip_temp, we do not care. */
437 if (trip_temp
<= 0 || tz
->temperature
< trip_temp
)
440 trace_thermal_zone_trip(tz
, trip
, trip_type
);
443 tz
->ops
->notify(tz
, trip
, trip_type
);
445 if (trip_type
== THERMAL_TRIP_CRITICAL
) {
446 dev_emerg(&tz
->device
,
447 "critical temperature reached(%d C),shutting down\n",
448 tz
->temperature
/ 1000);
449 orderly_poweroff(true);
453 static void handle_thermal_trip(struct thermal_zone_device
*tz
, int trip
)
455 enum thermal_trip_type type
;
457 /* Ignore disabled trip points */
458 if (test_bit(trip
, &tz
->trips_disabled
))
461 tz
->ops
->get_trip_type(tz
, trip
, &type
);
463 if (type
== THERMAL_TRIP_CRITICAL
|| type
== THERMAL_TRIP_HOT
)
464 handle_critical_trips(tz
, trip
, type
);
466 handle_non_critical_trips(tz
, trip
, type
);
468 * Alright, we handled this trip successfully.
469 * So, start monitoring again.
471 monitor_thermal_zone(tz
);
475 * thermal_zone_get_temp() - returns the temperature of a thermal zone
476 * @tz: a valid pointer to a struct thermal_zone_device
477 * @temp: a valid pointer to where to store the resulting temperature.
479 * When a valid thermal zone reference is passed, it will fetch its
480 * temperature and fill @temp.
482 * Return: On success returns 0, an error code otherwise
484 int thermal_zone_get_temp(struct thermal_zone_device
*tz
, int *temp
)
488 int crit_temp
= INT_MAX
;
489 enum thermal_trip_type type
;
491 if (!tz
|| IS_ERR(tz
) || !tz
->ops
->get_temp
)
494 mutex_lock(&tz
->lock
);
496 ret
= tz
->ops
->get_temp(tz
, temp
);
498 if (IS_ENABLED(CONFIG_THERMAL_EMULATION
) && tz
->emul_temperature
) {
499 for (count
= 0; count
< tz
->trips
; count
++) {
500 ret
= tz
->ops
->get_trip_type(tz
, count
, &type
);
501 if (!ret
&& type
== THERMAL_TRIP_CRITICAL
) {
502 ret
= tz
->ops
->get_trip_temp(tz
, count
,
509 * Only allow emulating a temperature when the real temperature
510 * is below the critical temperature so that the emulation code
511 * cannot hide critical conditions.
513 if (!ret
&& *temp
< crit_temp
)
514 *temp
= tz
->emul_temperature
;
517 mutex_unlock(&tz
->lock
);
521 EXPORT_SYMBOL_GPL(thermal_zone_get_temp
);
523 void thermal_zone_set_trips(struct thermal_zone_device
*tz
)
527 int trip_temp
, hysteresis
;
530 mutex_lock(&tz
->lock
);
532 if (!tz
->ops
->set_trips
|| !tz
->ops
->get_trip_hyst
)
535 for (i
= 0; i
< tz
->trips
; i
++) {
538 tz
->ops
->get_trip_temp(tz
, i
, &trip_temp
);
539 tz
->ops
->get_trip_hyst(tz
, i
, &hysteresis
);
541 trip_low
= trip_temp
- hysteresis
;
543 if (trip_low
< tz
->temperature
&& trip_low
> low
)
546 if (trip_temp
> tz
->temperature
&& trip_temp
< high
)
550 /* No need to change trip points */
551 if (tz
->prev_low_trip
== low
&& tz
->prev_high_trip
== high
)
554 tz
->prev_low_trip
= low
;
555 tz
->prev_high_trip
= high
;
558 "new temperature boundaries: %d < x < %d\n", low
, high
);
561 * Set a temperature window. When this window is left the driver
562 * must inform the thermal core via thermal_zone_device_update.
564 ret
= tz
->ops
->set_trips(tz
, low
, high
);
566 dev_err(&tz
->device
, "Failed to set trips: %d\n", ret
);
569 mutex_unlock(&tz
->lock
);
571 EXPORT_SYMBOL_GPL(thermal_zone_set_trips
);
573 static void update_temperature(struct thermal_zone_device
*tz
)
577 ret
= thermal_zone_get_temp(tz
, &temp
);
580 dev_warn(&tz
->device
,
581 "failed to read out thermal zone (%d)\n",
586 mutex_lock(&tz
->lock
);
587 tz
->last_temperature
= tz
->temperature
;
588 tz
->temperature
= temp
;
589 mutex_unlock(&tz
->lock
);
591 trace_thermal_temperature(tz
);
592 if (tz
->last_temperature
== THERMAL_TEMP_INVALID
)
593 dev_dbg(&tz
->device
, "last_temperature N/A, current_temperature=%d\n",
596 dev_dbg(&tz
->device
, "last_temperature=%d, current_temperature=%d\n",
597 tz
->last_temperature
, tz
->temperature
);
600 static void thermal_zone_device_reset(struct thermal_zone_device
*tz
)
602 struct thermal_instance
*pos
;
604 tz
->temperature
= THERMAL_TEMP_INVALID
;
606 list_for_each_entry(pos
, &tz
->thermal_instances
, tz_node
)
607 pos
->initialized
= false;
610 void thermal_zone_device_update(struct thermal_zone_device
*tz
)
614 if (atomic_read(&in_suspend
))
617 if (!tz
->ops
->get_temp
)
620 update_temperature(tz
);
622 thermal_zone_set_trips(tz
);
624 for (count
= 0; count
< tz
->trips
; count
++)
625 handle_thermal_trip(tz
, count
);
627 EXPORT_SYMBOL_GPL(thermal_zone_device_update
);
629 static void thermal_zone_device_check(struct work_struct
*work
)
631 struct thermal_zone_device
*tz
= container_of(work
, struct
634 thermal_zone_device_update(tz
);
637 /* sys I/F for thermal zone */
639 #define to_thermal_zone(_dev) \
640 container_of(_dev, struct thermal_zone_device, device)
643 type_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
645 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
647 return sprintf(buf
, "%s\n", tz
->type
);
651 temp_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
653 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
654 int temperature
, ret
;
656 ret
= thermal_zone_get_temp(tz
, &temperature
);
661 return sprintf(buf
, "%d\n", temperature
);
665 mode_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
667 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
668 enum thermal_device_mode mode
;
671 if (!tz
->ops
->get_mode
)
674 result
= tz
->ops
->get_mode(tz
, &mode
);
678 return sprintf(buf
, "%s\n", mode
== THERMAL_DEVICE_ENABLED
? "enabled"
683 mode_store(struct device
*dev
, struct device_attribute
*attr
,
684 const char *buf
, size_t count
)
686 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
689 if (!tz
->ops
->set_mode
)
692 if (!strncmp(buf
, "enabled", sizeof("enabled") - 1))
693 result
= tz
->ops
->set_mode(tz
, THERMAL_DEVICE_ENABLED
);
694 else if (!strncmp(buf
, "disabled", sizeof("disabled") - 1))
695 result
= tz
->ops
->set_mode(tz
, THERMAL_DEVICE_DISABLED
);
706 trip_point_type_show(struct device
*dev
, struct device_attribute
*attr
,
709 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
710 enum thermal_trip_type type
;
713 if (!tz
->ops
->get_trip_type
)
716 if (!sscanf(attr
->attr
.name
, "trip_point_%d_type", &trip
))
719 result
= tz
->ops
->get_trip_type(tz
, trip
, &type
);
724 case THERMAL_TRIP_CRITICAL
:
725 return sprintf(buf
, "critical\n");
726 case THERMAL_TRIP_HOT
:
727 return sprintf(buf
, "hot\n");
728 case THERMAL_TRIP_PASSIVE
:
729 return sprintf(buf
, "passive\n");
730 case THERMAL_TRIP_ACTIVE
:
731 return sprintf(buf
, "active\n");
733 return sprintf(buf
, "unknown\n");
738 trip_point_temp_store(struct device
*dev
, struct device_attribute
*attr
,
739 const char *buf
, size_t count
)
741 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
745 if (!tz
->ops
->set_trip_temp
)
748 if (!sscanf(attr
->attr
.name
, "trip_point_%d_temp", &trip
))
751 if (kstrtoint(buf
, 10, &temperature
))
754 ret
= tz
->ops
->set_trip_temp(tz
, trip
, temperature
);
758 thermal_zone_device_update(tz
);
764 trip_point_temp_show(struct device
*dev
, struct device_attribute
*attr
,
767 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
771 if (!tz
->ops
->get_trip_temp
)
774 if (!sscanf(attr
->attr
.name
, "trip_point_%d_temp", &trip
))
777 ret
= tz
->ops
->get_trip_temp(tz
, trip
, &temperature
);
782 return sprintf(buf
, "%d\n", temperature
);
786 trip_point_hyst_store(struct device
*dev
, struct device_attribute
*attr
,
787 const char *buf
, size_t count
)
789 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
793 if (!tz
->ops
->set_trip_hyst
)
796 if (!sscanf(attr
->attr
.name
, "trip_point_%d_hyst", &trip
))
799 if (kstrtoint(buf
, 10, &temperature
))
803 * We are not doing any check on the 'temperature' value
804 * here. The driver implementing 'set_trip_hyst' has to
807 ret
= tz
->ops
->set_trip_hyst(tz
, trip
, temperature
);
810 thermal_zone_set_trips(tz
);
812 return ret
? ret
: count
;
816 trip_point_hyst_show(struct device
*dev
, struct device_attribute
*attr
,
819 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
823 if (!tz
->ops
->get_trip_hyst
)
826 if (!sscanf(attr
->attr
.name
, "trip_point_%d_hyst", &trip
))
829 ret
= tz
->ops
->get_trip_hyst(tz
, trip
, &temperature
);
831 return ret
? ret
: sprintf(buf
, "%d\n", temperature
);
835 passive_store(struct device
*dev
, struct device_attribute
*attr
,
836 const char *buf
, size_t count
)
838 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
839 struct thermal_cooling_device
*cdev
= NULL
;
842 if (!sscanf(buf
, "%d\n", &state
))
845 /* sanity check: values below 1000 millicelcius don't make sense
846 * and can cause the system to go into a thermal heart attack
848 if (state
&& state
< 1000)
851 if (state
&& !tz
->forced_passive
) {
852 mutex_lock(&thermal_list_lock
);
853 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
854 if (!strncmp("Processor", cdev
->type
,
855 sizeof("Processor")))
856 thermal_zone_bind_cooling_device(tz
,
857 THERMAL_TRIPS_NONE
, cdev
,
860 THERMAL_WEIGHT_DEFAULT
);
862 mutex_unlock(&thermal_list_lock
);
863 if (!tz
->passive_delay
)
864 tz
->passive_delay
= 1000;
865 } else if (!state
&& tz
->forced_passive
) {
866 mutex_lock(&thermal_list_lock
);
867 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
868 if (!strncmp("Processor", cdev
->type
,
869 sizeof("Processor")))
870 thermal_zone_unbind_cooling_device(tz
,
874 mutex_unlock(&thermal_list_lock
);
875 tz
->passive_delay
= 0;
878 tz
->forced_passive
= state
;
880 thermal_zone_device_update(tz
);
886 passive_show(struct device
*dev
, struct device_attribute
*attr
,
889 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
891 return sprintf(buf
, "%d\n", tz
->forced_passive
);
895 policy_store(struct device
*dev
, struct device_attribute
*attr
,
896 const char *buf
, size_t count
)
899 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
900 struct thermal_governor
*gov
;
901 char name
[THERMAL_NAME_LENGTH
];
903 snprintf(name
, sizeof(name
), "%s", buf
);
905 mutex_lock(&thermal_governor_lock
);
906 mutex_lock(&tz
->lock
);
908 gov
= __find_governor(strim(name
));
912 ret
= thermal_set_governor(tz
, gov
);
917 mutex_unlock(&tz
->lock
);
918 mutex_unlock(&thermal_governor_lock
);
923 policy_show(struct device
*dev
, struct device_attribute
*devattr
, char *buf
)
925 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
927 return sprintf(buf
, "%s\n", tz
->governor
->name
);
931 available_policies_show(struct device
*dev
, struct device_attribute
*devattr
,
934 struct thermal_governor
*pos
;
936 ssize_t size
= PAGE_SIZE
;
938 mutex_lock(&thermal_governor_lock
);
940 list_for_each_entry(pos
, &thermal_governor_list
, governor_list
) {
941 size
= PAGE_SIZE
- count
;
942 count
+= scnprintf(buf
+ count
, size
, "%s ", pos
->name
);
944 count
+= scnprintf(buf
+ count
, size
, "\n");
946 mutex_unlock(&thermal_governor_lock
);
952 emul_temp_store(struct device
*dev
, struct device_attribute
*attr
,
953 const char *buf
, size_t count
)
955 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
959 if (kstrtoint(buf
, 10, &temperature
))
962 if (!tz
->ops
->set_emul_temp
) {
963 mutex_lock(&tz
->lock
);
964 tz
->emul_temperature
= temperature
;
965 mutex_unlock(&tz
->lock
);
967 ret
= tz
->ops
->set_emul_temp(tz
, temperature
);
971 thermal_zone_device_update(tz
);
973 return ret
? ret
: count
;
975 static DEVICE_ATTR(emul_temp
, S_IWUSR
, NULL
, emul_temp_store
);
978 sustainable_power_show(struct device
*dev
, struct device_attribute
*devattr
,
981 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
984 return sprintf(buf
, "%u\n", tz
->tzp
->sustainable_power
);
990 sustainable_power_store(struct device
*dev
, struct device_attribute
*devattr
,
991 const char *buf
, size_t count
)
993 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
994 u32 sustainable_power
;
999 if (kstrtou32(buf
, 10, &sustainable_power
))
1002 tz
->tzp
->sustainable_power
= sustainable_power
;
1006 static DEVICE_ATTR(sustainable_power
, S_IWUSR
| S_IRUGO
, sustainable_power_show
,
1007 sustainable_power_store
);
1009 #define create_s32_tzp_attr(name) \
1011 name##_show(struct device *dev, struct device_attribute *devattr, \
1014 struct thermal_zone_device *tz = to_thermal_zone(dev); \
1017 return sprintf(buf, "%d\n", tz->tzp->name); \
1023 name##_store(struct device *dev, struct device_attribute *devattr, \
1024 const char *buf, size_t count) \
1026 struct thermal_zone_device *tz = to_thermal_zone(dev); \
1032 if (kstrtos32(buf, 10, &value)) \
1035 tz->tzp->name = value; \
1039 static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
1041 create_s32_tzp_attr(k_po
);
1042 create_s32_tzp_attr(k_pu
);
1043 create_s32_tzp_attr(k_i
);
1044 create_s32_tzp_attr(k_d
);
1045 create_s32_tzp_attr(integral_cutoff
);
1046 create_s32_tzp_attr(slope
);
1047 create_s32_tzp_attr(offset
);
1048 #undef create_s32_tzp_attr
1050 static struct device_attribute
*dev_tzp_attrs
[] = {
1051 &dev_attr_sustainable_power
,
1056 &dev_attr_integral_cutoff
,
1061 static int create_tzp_attrs(struct device
*dev
)
1065 for (i
= 0; i
< ARRAY_SIZE(dev_tzp_attrs
); i
++) {
1067 struct device_attribute
*dev_attr
= dev_tzp_attrs
[i
];
1069 ret
= device_create_file(dev
, dev_attr
);
1078 * power_actor_get_max_power() - get the maximum power that a cdev can consume
1079 * @cdev: pointer to &thermal_cooling_device
1080 * @tz: a valid thermal zone device pointer
1081 * @max_power: pointer in which to store the maximum power
1083 * Calculate the maximum power consumption in milliwats that the
1084 * cooling device can currently consume and store it in @max_power.
1086 * Return: 0 on success, -EINVAL if @cdev doesn't support the
1087 * power_actor API or -E* on other error.
1089 int power_actor_get_max_power(struct thermal_cooling_device
*cdev
,
1090 struct thermal_zone_device
*tz
, u32
*max_power
)
1092 if (!cdev_is_power_actor(cdev
))
1095 return cdev
->ops
->state2power(cdev
, tz
, 0, max_power
);
1099 * power_actor_get_min_power() - get the mainimum power that a cdev can consume
1100 * @cdev: pointer to &thermal_cooling_device
1101 * @tz: a valid thermal zone device pointer
1102 * @min_power: pointer in which to store the minimum power
1104 * Calculate the minimum power consumption in milliwatts that the
1105 * cooling device can currently consume and store it in @min_power.
1107 * Return: 0 on success, -EINVAL if @cdev doesn't support the
1108 * power_actor API or -E* on other error.
1110 int power_actor_get_min_power(struct thermal_cooling_device
*cdev
,
1111 struct thermal_zone_device
*tz
, u32
*min_power
)
1113 unsigned long max_state
;
1116 if (!cdev_is_power_actor(cdev
))
1119 ret
= cdev
->ops
->get_max_state(cdev
, &max_state
);
1123 return cdev
->ops
->state2power(cdev
, tz
, max_state
, min_power
);
1127 * power_actor_set_power() - limit the maximum power that a cooling device can consume
1128 * @cdev: pointer to &thermal_cooling_device
1129 * @instance: thermal instance to update
1130 * @power: the power in milliwatts
1132 * Set the cooling device to consume at most @power milliwatts.
1134 * Return: 0 on success, -EINVAL if the cooling device does not
1135 * implement the power actor API or -E* for other failures.
1137 int power_actor_set_power(struct thermal_cooling_device
*cdev
,
1138 struct thermal_instance
*instance
, u32 power
)
1140 unsigned long state
;
1143 if (!cdev_is_power_actor(cdev
))
1146 ret
= cdev
->ops
->power2state(cdev
, instance
->tz
, power
, &state
);
1150 instance
->target
= state
;
1151 mutex_lock(&cdev
->lock
);
1152 cdev
->updated
= false;
1153 mutex_unlock(&cdev
->lock
);
1154 thermal_cdev_update(cdev
);
1159 static DEVICE_ATTR(type
, 0444, type_show
, NULL
);
1160 static DEVICE_ATTR(temp
, 0444, temp_show
, NULL
);
1161 static DEVICE_ATTR(mode
, 0644, mode_show
, mode_store
);
1162 static DEVICE_ATTR(passive
, S_IRUGO
| S_IWUSR
, passive_show
, passive_store
);
1163 static DEVICE_ATTR(policy
, S_IRUGO
| S_IWUSR
, policy_show
, policy_store
);
1164 static DEVICE_ATTR(available_policies
, S_IRUGO
, available_policies_show
, NULL
);
1166 /* sys I/F for cooling device */
1167 #define to_cooling_device(_dev) \
1168 container_of(_dev, struct thermal_cooling_device, device)
1171 thermal_cooling_device_type_show(struct device
*dev
,
1172 struct device_attribute
*attr
, char *buf
)
1174 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
1176 return sprintf(buf
, "%s\n", cdev
->type
);
1180 thermal_cooling_device_max_state_show(struct device
*dev
,
1181 struct device_attribute
*attr
, char *buf
)
1183 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
1184 unsigned long state
;
1187 ret
= cdev
->ops
->get_max_state(cdev
, &state
);
1190 return sprintf(buf
, "%ld\n", state
);
1194 thermal_cooling_device_cur_state_show(struct device
*dev
,
1195 struct device_attribute
*attr
, char *buf
)
1197 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
1198 unsigned long state
;
1201 ret
= cdev
->ops
->get_cur_state(cdev
, &state
);
1204 return sprintf(buf
, "%ld\n", state
);
1208 thermal_cooling_device_cur_state_store(struct device
*dev
,
1209 struct device_attribute
*attr
,
1210 const char *buf
, size_t count
)
1212 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
1213 unsigned long state
;
1216 if (!sscanf(buf
, "%ld\n", &state
))
1219 if ((long)state
< 0)
1222 result
= cdev
->ops
->set_cur_state(cdev
, state
);
1228 static struct device_attribute dev_attr_cdev_type
=
1229 __ATTR(type
, 0444, thermal_cooling_device_type_show
, NULL
);
1230 static DEVICE_ATTR(max_state
, 0444,
1231 thermal_cooling_device_max_state_show
, NULL
);
1232 static DEVICE_ATTR(cur_state
, 0644,
1233 thermal_cooling_device_cur_state_show
,
1234 thermal_cooling_device_cur_state_store
);
1237 thermal_cooling_device_trip_point_show(struct device
*dev
,
1238 struct device_attribute
*attr
, char *buf
)
1240 struct thermal_instance
*instance
;
1243 container_of(attr
, struct thermal_instance
, attr
);
1245 if (instance
->trip
== THERMAL_TRIPS_NONE
)
1246 return sprintf(buf
, "-1\n");
1248 return sprintf(buf
, "%d\n", instance
->trip
);
1251 static struct attribute
*cooling_device_attrs
[] = {
1252 &dev_attr_cdev_type
.attr
,
1253 &dev_attr_max_state
.attr
,
1254 &dev_attr_cur_state
.attr
,
1258 static const struct attribute_group cooling_device_attr_group
= {
1259 .attrs
= cooling_device_attrs
,
1262 static const struct attribute_group
*cooling_device_attr_groups
[] = {
1263 &cooling_device_attr_group
,
1268 thermal_cooling_device_weight_show(struct device
*dev
,
1269 struct device_attribute
*attr
, char *buf
)
1271 struct thermal_instance
*instance
;
1273 instance
= container_of(attr
, struct thermal_instance
, weight_attr
);
1275 return sprintf(buf
, "%d\n", instance
->weight
);
1279 thermal_cooling_device_weight_store(struct device
*dev
,
1280 struct device_attribute
*attr
,
1281 const char *buf
, size_t count
)
1283 struct thermal_instance
*instance
;
1286 ret
= kstrtoint(buf
, 0, &weight
);
1290 instance
= container_of(attr
, struct thermal_instance
, weight_attr
);
1291 instance
->weight
= weight
;
1295 /* Device management */
1298 * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
1299 * @tz: pointer to struct thermal_zone_device
1300 * @trip: indicates which trip point the cooling devices is
1301 * associated with in this thermal zone.
1302 * @cdev: pointer to struct thermal_cooling_device
1303 * @upper: the Maximum cooling state for this trip point.
1304 * THERMAL_NO_LIMIT means no upper limit,
1305 * and the cooling device can be in max_state.
1306 * @lower: the Minimum cooling state can be used for this trip point.
1307 * THERMAL_NO_LIMIT means no lower limit,
1308 * and the cooling device can be in cooling state 0.
1309 * @weight: The weight of the cooling device to be bound to the
1310 * thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
1313 * This interface function bind a thermal cooling device to the certain trip
1314 * point of a thermal zone device.
1315 * This function is usually called in the thermal zone device .bind callback.
1317 * Return: 0 on success, the proper error value otherwise.
1319 int thermal_zone_bind_cooling_device(struct thermal_zone_device
*tz
,
1321 struct thermal_cooling_device
*cdev
,
1322 unsigned long upper
, unsigned long lower
,
1323 unsigned int weight
)
1325 struct thermal_instance
*dev
;
1326 struct thermal_instance
*pos
;
1327 struct thermal_zone_device
*pos1
;
1328 struct thermal_cooling_device
*pos2
;
1329 unsigned long max_state
;
1332 if (trip
>= tz
->trips
|| (trip
< 0 && trip
!= THERMAL_TRIPS_NONE
))
1335 list_for_each_entry(pos1
, &thermal_tz_list
, node
) {
1339 list_for_each_entry(pos2
, &thermal_cdev_list
, node
) {
1344 if (tz
!= pos1
|| cdev
!= pos2
)
1347 ret
= cdev
->ops
->get_max_state(cdev
, &max_state
);
1351 /* lower default 0, upper default max_state */
1352 lower
= lower
== THERMAL_NO_LIMIT
? 0 : lower
;
1353 upper
= upper
== THERMAL_NO_LIMIT
? max_state
: upper
;
1355 if (lower
> upper
|| upper
> max_state
)
1359 kzalloc(sizeof(struct thermal_instance
), GFP_KERNEL
);
1367 dev
->target
= THERMAL_NO_TARGET
;
1368 dev
->weight
= weight
;
1370 result
= get_idr(&tz
->idr
, &tz
->lock
, &dev
->id
);
1374 sprintf(dev
->name
, "cdev%d", dev
->id
);
1376 sysfs_create_link(&tz
->device
.kobj
, &cdev
->device
.kobj
, dev
->name
);
1380 sprintf(dev
->attr_name
, "cdev%d_trip_point", dev
->id
);
1381 sysfs_attr_init(&dev
->attr
.attr
);
1382 dev
->attr
.attr
.name
= dev
->attr_name
;
1383 dev
->attr
.attr
.mode
= 0444;
1384 dev
->attr
.show
= thermal_cooling_device_trip_point_show
;
1385 result
= device_create_file(&tz
->device
, &dev
->attr
);
1387 goto remove_symbol_link
;
1389 sprintf(dev
->weight_attr_name
, "cdev%d_weight", dev
->id
);
1390 sysfs_attr_init(&dev
->weight_attr
.attr
);
1391 dev
->weight_attr
.attr
.name
= dev
->weight_attr_name
;
1392 dev
->weight_attr
.attr
.mode
= S_IWUSR
| S_IRUGO
;
1393 dev
->weight_attr
.show
= thermal_cooling_device_weight_show
;
1394 dev
->weight_attr
.store
= thermal_cooling_device_weight_store
;
1395 result
= device_create_file(&tz
->device
, &dev
->weight_attr
);
1397 goto remove_trip_file
;
1399 mutex_lock(&tz
->lock
);
1400 mutex_lock(&cdev
->lock
);
1401 list_for_each_entry(pos
, &tz
->thermal_instances
, tz_node
)
1402 if (pos
->tz
== tz
&& pos
->trip
== trip
&& pos
->cdev
== cdev
) {
1407 list_add_tail(&dev
->tz_node
, &tz
->thermal_instances
);
1408 list_add_tail(&dev
->cdev_node
, &cdev
->thermal_instances
);
1409 atomic_set(&tz
->need_update
, 1);
1411 mutex_unlock(&cdev
->lock
);
1412 mutex_unlock(&tz
->lock
);
1417 device_remove_file(&tz
->device
, &dev
->weight_attr
);
1419 device_remove_file(&tz
->device
, &dev
->attr
);
1421 sysfs_remove_link(&tz
->device
.kobj
, dev
->name
);
1423 release_idr(&tz
->idr
, &tz
->lock
, dev
->id
);
1428 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device
);
1431 * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1433 * @tz: pointer to a struct thermal_zone_device.
1434 * @trip: indicates which trip point the cooling devices is
1435 * associated with in this thermal zone.
1436 * @cdev: pointer to a struct thermal_cooling_device.
1438 * This interface function unbind a thermal cooling device from the certain
1439 * trip point of a thermal zone device.
1440 * This function is usually called in the thermal zone device .unbind callback.
1442 * Return: 0 on success, the proper error value otherwise.
1444 int thermal_zone_unbind_cooling_device(struct thermal_zone_device
*tz
,
1446 struct thermal_cooling_device
*cdev
)
1448 struct thermal_instance
*pos
, *next
;
1450 mutex_lock(&tz
->lock
);
1451 mutex_lock(&cdev
->lock
);
1452 list_for_each_entry_safe(pos
, next
, &tz
->thermal_instances
, tz_node
) {
1453 if (pos
->tz
== tz
&& pos
->trip
== trip
&& pos
->cdev
== cdev
) {
1454 list_del(&pos
->tz_node
);
1455 list_del(&pos
->cdev_node
);
1456 mutex_unlock(&cdev
->lock
);
1457 mutex_unlock(&tz
->lock
);
1461 mutex_unlock(&cdev
->lock
);
1462 mutex_unlock(&tz
->lock
);
1467 device_remove_file(&tz
->device
, &pos
->weight_attr
);
1468 device_remove_file(&tz
->device
, &pos
->attr
);
1469 sysfs_remove_link(&tz
->device
.kobj
, pos
->name
);
1470 release_idr(&tz
->idr
, &tz
->lock
, pos
->id
);
1474 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device
);
1476 static void thermal_release(struct device
*dev
)
1478 struct thermal_zone_device
*tz
;
1479 struct thermal_cooling_device
*cdev
;
1481 if (!strncmp(dev_name(dev
), "thermal_zone",
1482 sizeof("thermal_zone") - 1)) {
1483 tz
= to_thermal_zone(dev
);
1485 } else if(!strncmp(dev_name(dev
), "cooling_device",
1486 sizeof("cooling_device") - 1)){
1487 cdev
= to_cooling_device(dev
);
1492 static struct class thermal_class
= {
1494 .dev_release
= thermal_release
,
1498 * __thermal_cooling_device_register() - register a new thermal cooling device
1499 * @np: a pointer to a device tree node.
1500 * @type: the thermal cooling device type.
1501 * @devdata: device private data.
1502 * @ops: standard thermal cooling devices callbacks.
1504 * This interface function adds a new thermal cooling device (fan/processor/...)
1505 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1506 * to all the thermal zone devices registered at the same time.
1507 * It also gives the opportunity to link the cooling device to a device tree
1508 * node, so that it can be bound to a thermal zone created out of device tree.
1510 * Return: a pointer to the created struct thermal_cooling_device or an
1511 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1513 static struct thermal_cooling_device
*
1514 __thermal_cooling_device_register(struct device_node
*np
,
1515 char *type
, void *devdata
,
1516 const struct thermal_cooling_device_ops
*ops
)
1518 struct thermal_cooling_device
*cdev
;
1519 struct thermal_zone_device
*pos
= NULL
;
1522 if (type
&& strlen(type
) >= THERMAL_NAME_LENGTH
)
1523 return ERR_PTR(-EINVAL
);
1525 if (!ops
|| !ops
->get_max_state
|| !ops
->get_cur_state
||
1526 !ops
->set_cur_state
)
1527 return ERR_PTR(-EINVAL
);
1529 cdev
= kzalloc(sizeof(struct thermal_cooling_device
), GFP_KERNEL
);
1531 return ERR_PTR(-ENOMEM
);
1533 result
= get_idr(&thermal_cdev_idr
, &thermal_idr_lock
, &cdev
->id
);
1536 return ERR_PTR(result
);
1539 strlcpy(cdev
->type
, type
? : "", sizeof(cdev
->type
));
1540 mutex_init(&cdev
->lock
);
1541 INIT_LIST_HEAD(&cdev
->thermal_instances
);
1544 cdev
->updated
= false;
1545 cdev
->device
.class = &thermal_class
;
1546 cdev
->device
.groups
= cooling_device_attr_groups
;
1547 cdev
->devdata
= devdata
;
1548 dev_set_name(&cdev
->device
, "cooling_device%d", cdev
->id
);
1549 result
= device_register(&cdev
->device
);
1551 release_idr(&thermal_cdev_idr
, &thermal_idr_lock
, cdev
->id
);
1553 return ERR_PTR(result
);
1556 /* Add 'this' new cdev to the global cdev list */
1557 mutex_lock(&thermal_list_lock
);
1558 list_add(&cdev
->node
, &thermal_cdev_list
);
1559 mutex_unlock(&thermal_list_lock
);
1561 /* Update binding information for 'this' new cdev */
1564 mutex_lock(&thermal_list_lock
);
1565 list_for_each_entry(pos
, &thermal_tz_list
, node
)
1566 if (atomic_cmpxchg(&pos
->need_update
, 1, 0))
1567 thermal_zone_device_update(pos
);
1568 mutex_unlock(&thermal_list_lock
);
1574 * thermal_cooling_device_register() - register a new thermal cooling device
1575 * @type: the thermal cooling device type.
1576 * @devdata: device private data.
1577 * @ops: standard thermal cooling devices callbacks.
1579 * This interface function adds a new thermal cooling device (fan/processor/...)
1580 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1581 * to all the thermal zone devices registered at the same time.
1583 * Return: a pointer to the created struct thermal_cooling_device or an
1584 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1586 struct thermal_cooling_device
*
1587 thermal_cooling_device_register(char *type
, void *devdata
,
1588 const struct thermal_cooling_device_ops
*ops
)
1590 return __thermal_cooling_device_register(NULL
, type
, devdata
, ops
);
1592 EXPORT_SYMBOL_GPL(thermal_cooling_device_register
);
1595 * thermal_of_cooling_device_register() - register an OF thermal cooling device
1596 * @np: a pointer to a device tree node.
1597 * @type: the thermal cooling device type.
1598 * @devdata: device private data.
1599 * @ops: standard thermal cooling devices callbacks.
1601 * This function will register a cooling device with device tree node reference.
1602 * This interface function adds a new thermal cooling device (fan/processor/...)
1603 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1604 * to all the thermal zone devices registered at the same time.
1606 * Return: a pointer to the created struct thermal_cooling_device or an
1607 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1609 struct thermal_cooling_device
*
1610 thermal_of_cooling_device_register(struct device_node
*np
,
1611 char *type
, void *devdata
,
1612 const struct thermal_cooling_device_ops
*ops
)
1614 return __thermal_cooling_device_register(np
, type
, devdata
, ops
);
1616 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register
);
1619 * thermal_cooling_device_unregister - removes the registered thermal cooling device
1620 * @cdev: the thermal cooling device to remove.
1622 * thermal_cooling_device_unregister() must be called when the device is no
1625 void thermal_cooling_device_unregister(struct thermal_cooling_device
*cdev
)
1628 const struct thermal_zone_params
*tzp
;
1629 struct thermal_zone_device
*tz
;
1630 struct thermal_cooling_device
*pos
= NULL
;
1635 mutex_lock(&thermal_list_lock
);
1636 list_for_each_entry(pos
, &thermal_cdev_list
, node
)
1640 /* thermal cooling device not found */
1641 mutex_unlock(&thermal_list_lock
);
1644 list_del(&cdev
->node
);
1646 /* Unbind all thermal zones associated with 'this' cdev */
1647 list_for_each_entry(tz
, &thermal_tz_list
, node
) {
1648 if (tz
->ops
->unbind
) {
1649 tz
->ops
->unbind(tz
, cdev
);
1653 if (!tz
->tzp
|| !tz
->tzp
->tbp
)
1657 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
1658 if (tzp
->tbp
[i
].cdev
== cdev
) {
1659 __unbind(tz
, tzp
->tbp
[i
].trip_mask
, cdev
);
1660 tzp
->tbp
[i
].cdev
= NULL
;
1665 mutex_unlock(&thermal_list_lock
);
1668 device_remove_file(&cdev
->device
, &dev_attr_cdev_type
);
1669 device_remove_file(&cdev
->device
, &dev_attr_max_state
);
1670 device_remove_file(&cdev
->device
, &dev_attr_cur_state
);
1672 release_idr(&thermal_cdev_idr
, &thermal_idr_lock
, cdev
->id
);
1673 device_unregister(&cdev
->device
);
1676 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister
);
1678 void thermal_cdev_update(struct thermal_cooling_device
*cdev
)
1680 struct thermal_instance
*instance
;
1681 unsigned long target
= 0;
1683 mutex_lock(&cdev
->lock
);
1684 /* cooling device is updated*/
1685 if (cdev
->updated
) {
1686 mutex_unlock(&cdev
->lock
);
1690 /* Make sure cdev enters the deepest cooling state */
1691 list_for_each_entry(instance
, &cdev
->thermal_instances
, cdev_node
) {
1692 dev_dbg(&cdev
->device
, "zone%d->target=%lu\n",
1693 instance
->tz
->id
, instance
->target
);
1694 if (instance
->target
== THERMAL_NO_TARGET
)
1696 if (instance
->target
> target
)
1697 target
= instance
->target
;
1699 cdev
->ops
->set_cur_state(cdev
, target
);
1700 cdev
->updated
= true;
1701 mutex_unlock(&cdev
->lock
);
1702 trace_cdev_update(cdev
, target
);
1703 dev_dbg(&cdev
->device
, "set to state %lu\n", target
);
1705 EXPORT_SYMBOL(thermal_cdev_update
);
1708 * thermal_notify_framework - Sensor drivers use this API to notify framework
1709 * @tz: thermal zone device
1710 * @trip: indicates which trip point has been crossed
1712 * This function handles the trip events from sensor drivers. It starts
1713 * throttling the cooling devices according to the policy configured.
1714 * For CRITICAL and HOT trip points, this notifies the respective drivers,
1715 * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1716 * The throttling policy is based on the configured platform data; if no
1717 * platform data is provided, this uses the step_wise throttling policy.
1719 void thermal_notify_framework(struct thermal_zone_device
*tz
, int trip
)
1721 handle_thermal_trip(tz
, trip
);
1723 EXPORT_SYMBOL_GPL(thermal_notify_framework
);
1726 * create_trip_attrs() - create attributes for trip points
1727 * @tz: the thermal zone device
1728 * @mask: Writeable trip point bitmap.
1730 * helper function to instantiate sysfs entries for every trip
1731 * point and its properties of a struct thermal_zone_device.
1733 * Return: 0 on success, the proper error value otherwise.
1735 static int create_trip_attrs(struct thermal_zone_device
*tz
, int mask
)
1738 int size
= sizeof(struct thermal_attr
) * tz
->trips
;
1740 tz
->trip_type_attrs
= kzalloc(size
, GFP_KERNEL
);
1741 if (!tz
->trip_type_attrs
)
1744 tz
->trip_temp_attrs
= kzalloc(size
, GFP_KERNEL
);
1745 if (!tz
->trip_temp_attrs
) {
1746 kfree(tz
->trip_type_attrs
);
1750 if (tz
->ops
->get_trip_hyst
) {
1751 tz
->trip_hyst_attrs
= kzalloc(size
, GFP_KERNEL
);
1752 if (!tz
->trip_hyst_attrs
) {
1753 kfree(tz
->trip_type_attrs
);
1754 kfree(tz
->trip_temp_attrs
);
1760 for (indx
= 0; indx
< tz
->trips
; indx
++) {
1761 /* create trip type attribute */
1762 snprintf(tz
->trip_type_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1763 "trip_point_%d_type", indx
);
1765 sysfs_attr_init(&tz
->trip_type_attrs
[indx
].attr
.attr
);
1766 tz
->trip_type_attrs
[indx
].attr
.attr
.name
=
1767 tz
->trip_type_attrs
[indx
].name
;
1768 tz
->trip_type_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1769 tz
->trip_type_attrs
[indx
].attr
.show
= trip_point_type_show
;
1771 device_create_file(&tz
->device
,
1772 &tz
->trip_type_attrs
[indx
].attr
);
1774 /* create trip temp attribute */
1775 snprintf(tz
->trip_temp_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1776 "trip_point_%d_temp", indx
);
1778 sysfs_attr_init(&tz
->trip_temp_attrs
[indx
].attr
.attr
);
1779 tz
->trip_temp_attrs
[indx
].attr
.attr
.name
=
1780 tz
->trip_temp_attrs
[indx
].name
;
1781 tz
->trip_temp_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1782 tz
->trip_temp_attrs
[indx
].attr
.show
= trip_point_temp_show
;
1783 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS
) &&
1784 mask
& (1 << indx
)) {
1785 tz
->trip_temp_attrs
[indx
].attr
.attr
.mode
|= S_IWUSR
;
1786 tz
->trip_temp_attrs
[indx
].attr
.store
=
1787 trip_point_temp_store
;
1790 device_create_file(&tz
->device
,
1791 &tz
->trip_temp_attrs
[indx
].attr
);
1793 /* create Optional trip hyst attribute */
1794 if (!tz
->ops
->get_trip_hyst
)
1796 snprintf(tz
->trip_hyst_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1797 "trip_point_%d_hyst", indx
);
1799 sysfs_attr_init(&tz
->trip_hyst_attrs
[indx
].attr
.attr
);
1800 tz
->trip_hyst_attrs
[indx
].attr
.attr
.name
=
1801 tz
->trip_hyst_attrs
[indx
].name
;
1802 tz
->trip_hyst_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1803 tz
->trip_hyst_attrs
[indx
].attr
.show
= trip_point_hyst_show
;
1804 if (tz
->ops
->set_trip_hyst
) {
1805 tz
->trip_hyst_attrs
[indx
].attr
.attr
.mode
|= S_IWUSR
;
1806 tz
->trip_hyst_attrs
[indx
].attr
.store
=
1807 trip_point_hyst_store
;
1810 device_create_file(&tz
->device
,
1811 &tz
->trip_hyst_attrs
[indx
].attr
);
1816 static void remove_trip_attrs(struct thermal_zone_device
*tz
)
1820 for (indx
= 0; indx
< tz
->trips
; indx
++) {
1821 device_remove_file(&tz
->device
,
1822 &tz
->trip_type_attrs
[indx
].attr
);
1823 device_remove_file(&tz
->device
,
1824 &tz
->trip_temp_attrs
[indx
].attr
);
1825 if (tz
->ops
->get_trip_hyst
)
1826 device_remove_file(&tz
->device
,
1827 &tz
->trip_hyst_attrs
[indx
].attr
);
1829 kfree(tz
->trip_type_attrs
);
1830 kfree(tz
->trip_temp_attrs
);
1831 kfree(tz
->trip_hyst_attrs
);
1835 * thermal_zone_device_register() - register a new thermal zone device
1836 * @type: the thermal zone device type
1837 * @trips: the number of trip points the thermal zone support
1838 * @mask: a bit string indicating the writeablility of trip points
1839 * @devdata: private device data
1840 * @ops: standard thermal zone device callbacks
1841 * @tzp: thermal zone platform parameters
1842 * @passive_delay: number of milliseconds to wait between polls when
1843 * performing passive cooling
1844 * @polling_delay: number of milliseconds to wait between polls when checking
1845 * whether trip points have been crossed (0 for interrupt
1848 * This interface function adds a new thermal zone device (sensor) to
1849 * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1850 * thermal cooling devices registered at the same time.
1851 * thermal_zone_device_unregister() must be called when the device is no
1852 * longer needed. The passive cooling depends on the .get_trend() return value.
1854 * Return: a pointer to the created struct thermal_zone_device or an
1855 * in case of error, an ERR_PTR. Caller must check return value with
1856 * IS_ERR*() helpers.
1858 struct thermal_zone_device
*thermal_zone_device_register(const char *type
,
1859 int trips
, int mask
, void *devdata
,
1860 struct thermal_zone_device_ops
*ops
,
1861 struct thermal_zone_params
*tzp
,
1862 int passive_delay
, int polling_delay
)
1864 struct thermal_zone_device
*tz
;
1865 enum thermal_trip_type trip_type
;
1870 struct thermal_governor
*governor
;
1872 if (type
&& strlen(type
) >= THERMAL_NAME_LENGTH
)
1873 return ERR_PTR(-EINVAL
);
1875 if (trips
> THERMAL_MAX_TRIPS
|| trips
< 0 || mask
>> trips
)
1876 return ERR_PTR(-EINVAL
);
1879 return ERR_PTR(-EINVAL
);
1881 if (trips
> 0 && (!ops
->get_trip_type
|| !ops
->get_trip_temp
))
1882 return ERR_PTR(-EINVAL
);
1884 tz
= kzalloc(sizeof(struct thermal_zone_device
), GFP_KERNEL
);
1886 return ERR_PTR(-ENOMEM
);
1888 INIT_LIST_HEAD(&tz
->thermal_instances
);
1890 mutex_init(&tz
->lock
);
1891 result
= get_idr(&thermal_tz_idr
, &thermal_idr_lock
, &tz
->id
);
1894 return ERR_PTR(result
);
1897 strlcpy(tz
->type
, type
? : "", sizeof(tz
->type
));
1900 tz
->device
.class = &thermal_class
;
1901 tz
->devdata
= devdata
;
1903 tz
->passive_delay
= passive_delay
;
1904 tz
->polling_delay
= polling_delay
;
1905 /* A new thermal zone needs to be updated anyway. */
1906 atomic_set(&tz
->need_update
, 1);
1908 dev_set_name(&tz
->device
, "thermal_zone%d", tz
->id
);
1909 result
= device_register(&tz
->device
);
1911 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
1913 return ERR_PTR(result
);
1918 result
= device_create_file(&tz
->device
, &dev_attr_type
);
1923 result
= device_create_file(&tz
->device
, &dev_attr_temp
);
1927 if (ops
->get_mode
) {
1928 result
= device_create_file(&tz
->device
, &dev_attr_mode
);
1933 result
= create_trip_attrs(tz
, mask
);
1937 for (count
= 0; count
< trips
; count
++) {
1938 if (tz
->ops
->get_trip_type(tz
, count
, &trip_type
))
1939 set_bit(count
, &tz
->trips_disabled
);
1940 if (trip_type
== THERMAL_TRIP_PASSIVE
)
1942 if (tz
->ops
->get_trip_temp(tz
, count
, &trip_temp
))
1943 set_bit(count
, &tz
->trips_disabled
);
1944 /* Check for bogus trip points */
1946 set_bit(count
, &tz
->trips_disabled
);
1950 result
= device_create_file(&tz
->device
, &dev_attr_passive
);
1955 if (IS_ENABLED(CONFIG_THERMAL_EMULATION
)) {
1956 result
= device_create_file(&tz
->device
, &dev_attr_emul_temp
);
1961 /* Create policy attribute */
1962 result
= device_create_file(&tz
->device
, &dev_attr_policy
);
1966 /* Add thermal zone params */
1967 result
= create_tzp_attrs(&tz
->device
);
1971 /* Create available_policies attribute */
1972 result
= device_create_file(&tz
->device
, &dev_attr_available_policies
);
1976 /* Update 'this' zone's governor information */
1977 mutex_lock(&thermal_governor_lock
);
1980 governor
= __find_governor(tz
->tzp
->governor_name
);
1982 governor
= def_governor
;
1984 result
= thermal_set_governor(tz
, governor
);
1986 mutex_unlock(&thermal_governor_lock
);
1990 mutex_unlock(&thermal_governor_lock
);
1992 if (!tz
->tzp
|| !tz
->tzp
->no_hwmon
) {
1993 result
= thermal_add_hwmon_sysfs(tz
);
1998 mutex_lock(&thermal_list_lock
);
1999 list_add_tail(&tz
->node
, &thermal_tz_list
);
2000 mutex_unlock(&thermal_list_lock
);
2002 /* Bind cooling devices for this zone */
2005 INIT_DELAYED_WORK(&(tz
->poll_queue
), thermal_zone_device_check
);
2007 thermal_zone_device_reset(tz
);
2008 /* Update the new thermal zone and mark it as already updated. */
2009 if (atomic_cmpxchg(&tz
->need_update
, 1, 0))
2010 thermal_zone_device_update(tz
);
2015 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
2016 device_unregister(&tz
->device
);
2017 return ERR_PTR(result
);
2019 EXPORT_SYMBOL_GPL(thermal_zone_device_register
);
2022 * thermal_device_unregister - removes the registered thermal zone device
2023 * @tz: the thermal zone device to remove
2025 void thermal_zone_device_unregister(struct thermal_zone_device
*tz
)
2028 const struct thermal_zone_params
*tzp
;
2029 struct thermal_cooling_device
*cdev
;
2030 struct thermal_zone_device
*pos
= NULL
;
2037 mutex_lock(&thermal_list_lock
);
2038 list_for_each_entry(pos
, &thermal_tz_list
, node
)
2042 /* thermal zone device not found */
2043 mutex_unlock(&thermal_list_lock
);
2046 list_del(&tz
->node
);
2048 /* Unbind all cdevs associated with 'this' thermal zone */
2049 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
2050 if (tz
->ops
->unbind
) {
2051 tz
->ops
->unbind(tz
, cdev
);
2055 if (!tzp
|| !tzp
->tbp
)
2058 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
2059 if (tzp
->tbp
[i
].cdev
== cdev
) {
2060 __unbind(tz
, tzp
->tbp
[i
].trip_mask
, cdev
);
2061 tzp
->tbp
[i
].cdev
= NULL
;
2066 mutex_unlock(&thermal_list_lock
);
2068 thermal_zone_device_set_polling(tz
, 0);
2071 device_remove_file(&tz
->device
, &dev_attr_type
);
2072 device_remove_file(&tz
->device
, &dev_attr_temp
);
2073 if (tz
->ops
->get_mode
)
2074 device_remove_file(&tz
->device
, &dev_attr_mode
);
2075 device_remove_file(&tz
->device
, &dev_attr_policy
);
2076 device_remove_file(&tz
->device
, &dev_attr_available_policies
);
2077 remove_trip_attrs(tz
);
2078 thermal_set_governor(tz
, NULL
);
2080 thermal_remove_hwmon_sysfs(tz
);
2081 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
2082 idr_destroy(&tz
->idr
);
2083 mutex_destroy(&tz
->lock
);
2084 device_unregister(&tz
->device
);
2087 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister
);
2090 * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
2091 * @name: thermal zone name to fetch the temperature
2093 * When only one zone is found with the passed name, returns a reference to it.
2095 * Return: On success returns a reference to an unique thermal zone with
2096 * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
2097 * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
2099 struct thermal_zone_device
*thermal_zone_get_zone_by_name(const char *name
)
2101 struct thermal_zone_device
*pos
= NULL
, *ref
= ERR_PTR(-EINVAL
);
2102 unsigned int found
= 0;
2107 mutex_lock(&thermal_list_lock
);
2108 list_for_each_entry(pos
, &thermal_tz_list
, node
)
2109 if (!strncasecmp(name
, pos
->type
, THERMAL_NAME_LENGTH
)) {
2113 mutex_unlock(&thermal_list_lock
);
2115 /* nothing has been found, thus an error code for it */
2117 ref
= ERR_PTR(-ENODEV
);
2119 /* Success only when an unique zone is found */
2120 ref
= ERR_PTR(-EEXIST
);
2125 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name
);
2128 * thermal_zone_get_slope - return the slope attribute of the thermal zone
2129 * @tz: thermal zone device with the slope attribute
2131 * Return: If the thermal zone device has a slope attribute, return it, else
2134 int thermal_zone_get_slope(struct thermal_zone_device
*tz
)
2137 return tz
->tzp
->slope
;
2140 EXPORT_SYMBOL_GPL(thermal_zone_get_slope
);
2143 * thermal_zone_get_offset - return the offset attribute of the thermal zone
2144 * @tz: thermal zone device with the offset attribute
2146 * Return: If the thermal zone device has a offset attribute, return it, else
2149 int thermal_zone_get_offset(struct thermal_zone_device
*tz
)
2152 return tz
->tzp
->offset
;
2155 EXPORT_SYMBOL_GPL(thermal_zone_get_offset
);
2158 static const struct genl_multicast_group thermal_event_mcgrps
[] = {
2159 { .name
= THERMAL_GENL_MCAST_GROUP_NAME
, },
2162 static struct genl_family thermal_event_genl_family
= {
2163 .id
= GENL_ID_GENERATE
,
2164 .name
= THERMAL_GENL_FAMILY_NAME
,
2165 .version
= THERMAL_GENL_VERSION
,
2166 .maxattr
= THERMAL_GENL_ATTR_MAX
,
2167 .mcgrps
= thermal_event_mcgrps
,
2168 .n_mcgrps
= ARRAY_SIZE(thermal_event_mcgrps
),
2171 int thermal_generate_netlink_event(struct thermal_zone_device
*tz
,
2174 struct sk_buff
*skb
;
2175 struct nlattr
*attr
;
2176 struct thermal_genl_event
*thermal_event
;
2180 static unsigned int thermal_event_seqnum
;
2185 /* allocate memory */
2186 size
= nla_total_size(sizeof(struct thermal_genl_event
)) +
2189 skb
= genlmsg_new(size
, GFP_ATOMIC
);
2193 /* add the genetlink message header */
2194 msg_header
= genlmsg_put(skb
, 0, thermal_event_seqnum
++,
2195 &thermal_event_genl_family
, 0,
2196 THERMAL_GENL_CMD_EVENT
);
2203 attr
= nla_reserve(skb
, THERMAL_GENL_ATTR_EVENT
,
2204 sizeof(struct thermal_genl_event
));
2211 thermal_event
= nla_data(attr
);
2212 if (!thermal_event
) {
2217 memset(thermal_event
, 0, sizeof(struct thermal_genl_event
));
2219 thermal_event
->orig
= tz
->id
;
2220 thermal_event
->event
= event
;
2222 /* send multicast genetlink message */
2223 genlmsg_end(skb
, msg_header
);
2225 result
= genlmsg_multicast(&thermal_event_genl_family
, skb
, 0,
2228 dev_err(&tz
->device
, "Failed to send netlink event:%d", result
);
2232 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event
);
2234 static int genetlink_init(void)
2236 return genl_register_family(&thermal_event_genl_family
);
2239 static void genetlink_exit(void)
2241 genl_unregister_family(&thermal_event_genl_family
);
2243 #else /* !CONFIG_NET */
2244 static inline int genetlink_init(void) { return 0; }
2245 static inline void genetlink_exit(void) {}
2246 #endif /* !CONFIG_NET */
2248 static int __init
thermal_register_governors(void)
2252 result
= thermal_gov_step_wise_register();
2256 result
= thermal_gov_fair_share_register();
2260 result
= thermal_gov_bang_bang_register();
2264 result
= thermal_gov_user_space_register();
2268 return thermal_gov_power_allocator_register();
2271 static void thermal_unregister_governors(void)
2273 thermal_gov_step_wise_unregister();
2274 thermal_gov_fair_share_unregister();
2275 thermal_gov_bang_bang_unregister();
2276 thermal_gov_user_space_unregister();
2277 thermal_gov_power_allocator_unregister();
2280 static int thermal_pm_notify(struct notifier_block
*nb
,
2281 unsigned long mode
, void *_unused
)
2283 struct thermal_zone_device
*tz
;
2286 case PM_HIBERNATION_PREPARE
:
2287 case PM_RESTORE_PREPARE
:
2288 case PM_SUSPEND_PREPARE
:
2289 atomic_set(&in_suspend
, 1);
2291 case PM_POST_HIBERNATION
:
2292 case PM_POST_RESTORE
:
2293 case PM_POST_SUSPEND
:
2294 atomic_set(&in_suspend
, 0);
2295 list_for_each_entry(tz
, &thermal_tz_list
, node
) {
2296 thermal_zone_device_reset(tz
);
2297 thermal_zone_device_update(tz
);
2306 static struct notifier_block thermal_pm_nb
= {
2307 .notifier_call
= thermal_pm_notify
,
2310 static int __init
thermal_init(void)
2314 result
= thermal_register_governors();
2318 result
= class_register(&thermal_class
);
2320 goto unregister_governors
;
2322 result
= genetlink_init();
2324 goto unregister_class
;
2326 result
= of_parse_thermal_zones();
2330 result
= register_pm_notifier(&thermal_pm_nb
);
2332 pr_warn("Thermal: Can not register suspend notifier, return %d\n",
2340 class_unregister(&thermal_class
);
2341 unregister_governors
:
2342 thermal_unregister_governors();
2344 idr_destroy(&thermal_tz_idr
);
2345 idr_destroy(&thermal_cdev_idr
);
2346 mutex_destroy(&thermal_idr_lock
);
2347 mutex_destroy(&thermal_list_lock
);
2348 mutex_destroy(&thermal_governor_lock
);
2352 static void __exit
thermal_exit(void)
2354 unregister_pm_notifier(&thermal_pm_nb
);
2355 of_thermal_destroy_zones();
2357 class_unregister(&thermal_class
);
2358 thermal_unregister_governors();
2359 idr_destroy(&thermal_tz_idr
);
2360 idr_destroy(&thermal_cdev_idr
);
2361 mutex_destroy(&thermal_idr_lock
);
2362 mutex_destroy(&thermal_list_lock
);
2363 mutex_destroy(&thermal_governor_lock
);
2366 fs_initcall(thermal_init
);
2367 module_exit(thermal_exit
);