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 tz
->ops
->get_trip_type(tz
, trip
, &type
);
459 if (type
== THERMAL_TRIP_CRITICAL
|| type
== THERMAL_TRIP_HOT
)
460 handle_critical_trips(tz
, trip
, type
);
462 handle_non_critical_trips(tz
, trip
, type
);
464 * Alright, we handled this trip successfully.
465 * So, start monitoring again.
467 monitor_thermal_zone(tz
);
471 * thermal_zone_get_temp() - returns the temperature of a thermal zone
472 * @tz: a valid pointer to a struct thermal_zone_device
473 * @temp: a valid pointer to where to store the resulting temperature.
475 * When a valid thermal zone reference is passed, it will fetch its
476 * temperature and fill @temp.
478 * Return: On success returns 0, an error code otherwise
480 int thermal_zone_get_temp(struct thermal_zone_device
*tz
, int *temp
)
484 int crit_temp
= INT_MAX
;
485 enum thermal_trip_type type
;
487 if (!tz
|| IS_ERR(tz
) || !tz
->ops
->get_temp
)
490 mutex_lock(&tz
->lock
);
492 ret
= tz
->ops
->get_temp(tz
, temp
);
494 if (IS_ENABLED(CONFIG_THERMAL_EMULATION
) && tz
->emul_temperature
) {
495 for (count
= 0; count
< tz
->trips
; count
++) {
496 ret
= tz
->ops
->get_trip_type(tz
, count
, &type
);
497 if (!ret
&& type
== THERMAL_TRIP_CRITICAL
) {
498 ret
= tz
->ops
->get_trip_temp(tz
, count
,
505 * Only allow emulating a temperature when the real temperature
506 * is below the critical temperature so that the emulation code
507 * cannot hide critical conditions.
509 if (!ret
&& *temp
< crit_temp
)
510 *temp
= tz
->emul_temperature
;
513 mutex_unlock(&tz
->lock
);
517 EXPORT_SYMBOL_GPL(thermal_zone_get_temp
);
519 static void update_temperature(struct thermal_zone_device
*tz
)
523 ret
= thermal_zone_get_temp(tz
, &temp
);
526 dev_warn(&tz
->device
,
527 "failed to read out thermal zone (%d)\n",
532 mutex_lock(&tz
->lock
);
533 tz
->last_temperature
= tz
->temperature
;
534 tz
->temperature
= temp
;
535 mutex_unlock(&tz
->lock
);
537 trace_thermal_temperature(tz
);
538 if (tz
->last_temperature
== THERMAL_TEMP_INVALID
)
539 dev_dbg(&tz
->device
, "last_temperature N/A, current_temperature=%d\n",
542 dev_dbg(&tz
->device
, "last_temperature=%d, current_temperature=%d\n",
543 tz
->last_temperature
, tz
->temperature
);
546 static void thermal_zone_device_reset(struct thermal_zone_device
*tz
)
548 struct thermal_instance
*pos
;
550 tz
->temperature
= THERMAL_TEMP_INVALID
;
552 list_for_each_entry(pos
, &tz
->thermal_instances
, tz_node
)
553 pos
->initialized
= false;
556 void thermal_zone_device_update(struct thermal_zone_device
*tz
)
560 if (atomic_read(&in_suspend
))
563 if (!tz
->ops
->get_temp
)
566 update_temperature(tz
);
568 for (count
= 0; count
< tz
->trips
; count
++)
569 handle_thermal_trip(tz
, count
);
571 EXPORT_SYMBOL_GPL(thermal_zone_device_update
);
573 static void thermal_zone_device_check(struct work_struct
*work
)
575 struct thermal_zone_device
*tz
= container_of(work
, struct
578 thermal_zone_device_update(tz
);
581 /* sys I/F for thermal zone */
583 #define to_thermal_zone(_dev) \
584 container_of(_dev, struct thermal_zone_device, device)
587 type_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
589 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
591 return sprintf(buf
, "%s\n", tz
->type
);
595 temp_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
597 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
598 int temperature
, ret
;
600 ret
= thermal_zone_get_temp(tz
, &temperature
);
605 return sprintf(buf
, "%d\n", temperature
);
609 mode_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
611 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
612 enum thermal_device_mode mode
;
615 if (!tz
->ops
->get_mode
)
618 result
= tz
->ops
->get_mode(tz
, &mode
);
622 return sprintf(buf
, "%s\n", mode
== THERMAL_DEVICE_ENABLED
? "enabled"
627 mode_store(struct device
*dev
, struct device_attribute
*attr
,
628 const char *buf
, size_t count
)
630 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
633 if (!tz
->ops
->set_mode
)
636 if (!strncmp(buf
, "enabled", sizeof("enabled") - 1))
637 result
= tz
->ops
->set_mode(tz
, THERMAL_DEVICE_ENABLED
);
638 else if (!strncmp(buf
, "disabled", sizeof("disabled") - 1))
639 result
= tz
->ops
->set_mode(tz
, THERMAL_DEVICE_DISABLED
);
650 trip_point_type_show(struct device
*dev
, struct device_attribute
*attr
,
653 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
654 enum thermal_trip_type type
;
657 if (!tz
->ops
->get_trip_type
)
660 if (!sscanf(attr
->attr
.name
, "trip_point_%d_type", &trip
))
663 result
= tz
->ops
->get_trip_type(tz
, trip
, &type
);
668 case THERMAL_TRIP_CRITICAL
:
669 return sprintf(buf
, "critical\n");
670 case THERMAL_TRIP_HOT
:
671 return sprintf(buf
, "hot\n");
672 case THERMAL_TRIP_PASSIVE
:
673 return sprintf(buf
, "passive\n");
674 case THERMAL_TRIP_ACTIVE
:
675 return sprintf(buf
, "active\n");
677 return sprintf(buf
, "unknown\n");
682 trip_point_temp_store(struct device
*dev
, struct device_attribute
*attr
,
683 const char *buf
, size_t count
)
685 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
687 unsigned long temperature
;
689 if (!tz
->ops
->set_trip_temp
)
692 if (!sscanf(attr
->attr
.name
, "trip_point_%d_temp", &trip
))
695 if (kstrtoul(buf
, 10, &temperature
))
698 ret
= tz
->ops
->set_trip_temp(tz
, trip
, temperature
);
702 thermal_zone_device_update(tz
);
708 trip_point_temp_show(struct device
*dev
, struct device_attribute
*attr
,
711 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
715 if (!tz
->ops
->get_trip_temp
)
718 if (!sscanf(attr
->attr
.name
, "trip_point_%d_temp", &trip
))
721 ret
= tz
->ops
->get_trip_temp(tz
, trip
, &temperature
);
726 return sprintf(buf
, "%d\n", temperature
);
730 trip_point_hyst_store(struct device
*dev
, struct device_attribute
*attr
,
731 const char *buf
, size_t count
)
733 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
737 if (!tz
->ops
->set_trip_hyst
)
740 if (!sscanf(attr
->attr
.name
, "trip_point_%d_hyst", &trip
))
743 if (kstrtoint(buf
, 10, &temperature
))
747 * We are not doing any check on the 'temperature' value
748 * here. The driver implementing 'set_trip_hyst' has to
751 ret
= tz
->ops
->set_trip_hyst(tz
, trip
, temperature
);
753 return ret
? ret
: count
;
757 trip_point_hyst_show(struct device
*dev
, struct device_attribute
*attr
,
760 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
764 if (!tz
->ops
->get_trip_hyst
)
767 if (!sscanf(attr
->attr
.name
, "trip_point_%d_hyst", &trip
))
770 ret
= tz
->ops
->get_trip_hyst(tz
, trip
, &temperature
);
772 return ret
? ret
: sprintf(buf
, "%d\n", temperature
);
776 passive_store(struct device
*dev
, struct device_attribute
*attr
,
777 const char *buf
, size_t count
)
779 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
780 struct thermal_cooling_device
*cdev
= NULL
;
783 if (!sscanf(buf
, "%d\n", &state
))
786 /* sanity check: values below 1000 millicelcius don't make sense
787 * and can cause the system to go into a thermal heart attack
789 if (state
&& state
< 1000)
792 if (state
&& !tz
->forced_passive
) {
793 mutex_lock(&thermal_list_lock
);
794 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
795 if (!strncmp("Processor", cdev
->type
,
796 sizeof("Processor")))
797 thermal_zone_bind_cooling_device(tz
,
798 THERMAL_TRIPS_NONE
, cdev
,
801 THERMAL_WEIGHT_DEFAULT
);
803 mutex_unlock(&thermal_list_lock
);
804 if (!tz
->passive_delay
)
805 tz
->passive_delay
= 1000;
806 } else if (!state
&& tz
->forced_passive
) {
807 mutex_lock(&thermal_list_lock
);
808 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
809 if (!strncmp("Processor", cdev
->type
,
810 sizeof("Processor")))
811 thermal_zone_unbind_cooling_device(tz
,
815 mutex_unlock(&thermal_list_lock
);
816 tz
->passive_delay
= 0;
819 tz
->forced_passive
= state
;
821 thermal_zone_device_update(tz
);
827 passive_show(struct device
*dev
, struct device_attribute
*attr
,
830 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
832 return sprintf(buf
, "%d\n", tz
->forced_passive
);
836 policy_store(struct device
*dev
, struct device_attribute
*attr
,
837 const char *buf
, size_t count
)
840 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
841 struct thermal_governor
*gov
;
842 char name
[THERMAL_NAME_LENGTH
];
844 snprintf(name
, sizeof(name
), "%s", buf
);
846 mutex_lock(&thermal_governor_lock
);
847 mutex_lock(&tz
->lock
);
849 gov
= __find_governor(strim(name
));
853 ret
= thermal_set_governor(tz
, gov
);
858 mutex_unlock(&tz
->lock
);
859 mutex_unlock(&thermal_governor_lock
);
864 policy_show(struct device
*dev
, struct device_attribute
*devattr
, char *buf
)
866 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
868 return sprintf(buf
, "%s\n", tz
->governor
->name
);
872 available_policies_show(struct device
*dev
, struct device_attribute
*devattr
,
875 struct thermal_governor
*pos
;
877 ssize_t size
= PAGE_SIZE
;
879 mutex_lock(&thermal_governor_lock
);
881 list_for_each_entry(pos
, &thermal_governor_list
, governor_list
) {
882 size
= PAGE_SIZE
- count
;
883 count
+= scnprintf(buf
+ count
, size
, "%s ", pos
->name
);
885 count
+= scnprintf(buf
+ count
, size
, "\n");
887 mutex_unlock(&thermal_governor_lock
);
893 emul_temp_store(struct device
*dev
, struct device_attribute
*attr
,
894 const char *buf
, size_t count
)
896 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
898 unsigned long temperature
;
900 if (kstrtoul(buf
, 10, &temperature
))
903 if (!tz
->ops
->set_emul_temp
) {
904 mutex_lock(&tz
->lock
);
905 tz
->emul_temperature
= temperature
;
906 mutex_unlock(&tz
->lock
);
908 ret
= tz
->ops
->set_emul_temp(tz
, temperature
);
912 thermal_zone_device_update(tz
);
914 return ret
? ret
: count
;
916 static DEVICE_ATTR(emul_temp
, S_IWUSR
, NULL
, emul_temp_store
);
919 sustainable_power_show(struct device
*dev
, struct device_attribute
*devattr
,
922 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
925 return sprintf(buf
, "%u\n", tz
->tzp
->sustainable_power
);
931 sustainable_power_store(struct device
*dev
, struct device_attribute
*devattr
,
932 const char *buf
, size_t count
)
934 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
935 u32 sustainable_power
;
940 if (kstrtou32(buf
, 10, &sustainable_power
))
943 tz
->tzp
->sustainable_power
= sustainable_power
;
947 static DEVICE_ATTR(sustainable_power
, S_IWUSR
| S_IRUGO
, sustainable_power_show
,
948 sustainable_power_store
);
950 #define create_s32_tzp_attr(name) \
952 name##_show(struct device *dev, struct device_attribute *devattr, \
955 struct thermal_zone_device *tz = to_thermal_zone(dev); \
958 return sprintf(buf, "%u\n", tz->tzp->name); \
964 name##_store(struct device *dev, struct device_attribute *devattr, \
965 const char *buf, size_t count) \
967 struct thermal_zone_device *tz = to_thermal_zone(dev); \
973 if (kstrtos32(buf, 10, &value)) \
976 tz->tzp->name = value; \
980 static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
982 create_s32_tzp_attr(k_po
);
983 create_s32_tzp_attr(k_pu
);
984 create_s32_tzp_attr(k_i
);
985 create_s32_tzp_attr(k_d
);
986 create_s32_tzp_attr(integral_cutoff
);
987 create_s32_tzp_attr(slope
);
988 create_s32_tzp_attr(offset
);
989 #undef create_s32_tzp_attr
991 static struct device_attribute
*dev_tzp_attrs
[] = {
992 &dev_attr_sustainable_power
,
997 &dev_attr_integral_cutoff
,
1002 static int create_tzp_attrs(struct device
*dev
)
1006 for (i
= 0; i
< ARRAY_SIZE(dev_tzp_attrs
); i
++) {
1008 struct device_attribute
*dev_attr
= dev_tzp_attrs
[i
];
1010 ret
= device_create_file(dev
, dev_attr
);
1019 * power_actor_get_max_power() - get the maximum power that a cdev can consume
1020 * @cdev: pointer to &thermal_cooling_device
1021 * @tz: a valid thermal zone device pointer
1022 * @max_power: pointer in which to store the maximum power
1024 * Calculate the maximum power consumption in milliwats that the
1025 * cooling device can currently consume and store it in @max_power.
1027 * Return: 0 on success, -EINVAL if @cdev doesn't support the
1028 * power_actor API or -E* on other error.
1030 int power_actor_get_max_power(struct thermal_cooling_device
*cdev
,
1031 struct thermal_zone_device
*tz
, u32
*max_power
)
1033 if (!cdev_is_power_actor(cdev
))
1036 return cdev
->ops
->state2power(cdev
, tz
, 0, max_power
);
1040 * power_actor_get_min_power() - get the mainimum power that a cdev can consume
1041 * @cdev: pointer to &thermal_cooling_device
1042 * @tz: a valid thermal zone device pointer
1043 * @min_power: pointer in which to store the minimum power
1045 * Calculate the minimum power consumption in milliwatts that the
1046 * cooling device can currently consume and store it in @min_power.
1048 * Return: 0 on success, -EINVAL if @cdev doesn't support the
1049 * power_actor API or -E* on other error.
1051 int power_actor_get_min_power(struct thermal_cooling_device
*cdev
,
1052 struct thermal_zone_device
*tz
, u32
*min_power
)
1054 unsigned long max_state
;
1057 if (!cdev_is_power_actor(cdev
))
1060 ret
= cdev
->ops
->get_max_state(cdev
, &max_state
);
1064 return cdev
->ops
->state2power(cdev
, tz
, max_state
, min_power
);
1068 * power_actor_set_power() - limit the maximum power that a cooling device can consume
1069 * @cdev: pointer to &thermal_cooling_device
1070 * @instance: thermal instance to update
1071 * @power: the power in milliwatts
1073 * Set the cooling device to consume at most @power milliwatts.
1075 * Return: 0 on success, -EINVAL if the cooling device does not
1076 * implement the power actor API or -E* for other failures.
1078 int power_actor_set_power(struct thermal_cooling_device
*cdev
,
1079 struct thermal_instance
*instance
, u32 power
)
1081 unsigned long state
;
1084 if (!cdev_is_power_actor(cdev
))
1087 ret
= cdev
->ops
->power2state(cdev
, instance
->tz
, power
, &state
);
1091 instance
->target
= state
;
1092 cdev
->updated
= false;
1093 thermal_cdev_update(cdev
);
1098 static DEVICE_ATTR(type
, 0444, type_show
, NULL
);
1099 static DEVICE_ATTR(temp
, 0444, temp_show
, NULL
);
1100 static DEVICE_ATTR(mode
, 0644, mode_show
, mode_store
);
1101 static DEVICE_ATTR(passive
, S_IRUGO
| S_IWUSR
, passive_show
, passive_store
);
1102 static DEVICE_ATTR(policy
, S_IRUGO
| S_IWUSR
, policy_show
, policy_store
);
1103 static DEVICE_ATTR(available_policies
, S_IRUGO
, available_policies_show
, NULL
);
1105 /* sys I/F for cooling device */
1106 #define to_cooling_device(_dev) \
1107 container_of(_dev, struct thermal_cooling_device, device)
1110 thermal_cooling_device_type_show(struct device
*dev
,
1111 struct device_attribute
*attr
, char *buf
)
1113 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
1115 return sprintf(buf
, "%s\n", cdev
->type
);
1119 thermal_cooling_device_max_state_show(struct device
*dev
,
1120 struct device_attribute
*attr
, char *buf
)
1122 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
1123 unsigned long state
;
1126 ret
= cdev
->ops
->get_max_state(cdev
, &state
);
1129 return sprintf(buf
, "%ld\n", state
);
1133 thermal_cooling_device_cur_state_show(struct device
*dev
,
1134 struct device_attribute
*attr
, char *buf
)
1136 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
1137 unsigned long state
;
1140 ret
= cdev
->ops
->get_cur_state(cdev
, &state
);
1143 return sprintf(buf
, "%ld\n", state
);
1147 thermal_cooling_device_cur_state_store(struct device
*dev
,
1148 struct device_attribute
*attr
,
1149 const char *buf
, size_t count
)
1151 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
1152 unsigned long state
;
1155 if (!sscanf(buf
, "%ld\n", &state
))
1158 if ((long)state
< 0)
1161 result
= cdev
->ops
->set_cur_state(cdev
, state
);
1167 static struct device_attribute dev_attr_cdev_type
=
1168 __ATTR(type
, 0444, thermal_cooling_device_type_show
, NULL
);
1169 static DEVICE_ATTR(max_state
, 0444,
1170 thermal_cooling_device_max_state_show
, NULL
);
1171 static DEVICE_ATTR(cur_state
, 0644,
1172 thermal_cooling_device_cur_state_show
,
1173 thermal_cooling_device_cur_state_store
);
1176 thermal_cooling_device_trip_point_show(struct device
*dev
,
1177 struct device_attribute
*attr
, char *buf
)
1179 struct thermal_instance
*instance
;
1182 container_of(attr
, struct thermal_instance
, attr
);
1184 if (instance
->trip
== THERMAL_TRIPS_NONE
)
1185 return sprintf(buf
, "-1\n");
1187 return sprintf(buf
, "%d\n", instance
->trip
);
1190 static struct attribute
*cooling_device_attrs
[] = {
1191 &dev_attr_cdev_type
.attr
,
1192 &dev_attr_max_state
.attr
,
1193 &dev_attr_cur_state
.attr
,
1197 static const struct attribute_group cooling_device_attr_group
= {
1198 .attrs
= cooling_device_attrs
,
1201 static const struct attribute_group
*cooling_device_attr_groups
[] = {
1202 &cooling_device_attr_group
,
1207 thermal_cooling_device_weight_show(struct device
*dev
,
1208 struct device_attribute
*attr
, char *buf
)
1210 struct thermal_instance
*instance
;
1212 instance
= container_of(attr
, struct thermal_instance
, weight_attr
);
1214 return sprintf(buf
, "%d\n", instance
->weight
);
1218 thermal_cooling_device_weight_store(struct device
*dev
,
1219 struct device_attribute
*attr
,
1220 const char *buf
, size_t count
)
1222 struct thermal_instance
*instance
;
1225 ret
= kstrtoint(buf
, 0, &weight
);
1229 instance
= container_of(attr
, struct thermal_instance
, weight_attr
);
1230 instance
->weight
= weight
;
1234 /* Device management */
1237 * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
1238 * @tz: pointer to struct thermal_zone_device
1239 * @trip: indicates which trip point the cooling devices is
1240 * associated with in this thermal zone.
1241 * @cdev: pointer to struct thermal_cooling_device
1242 * @upper: the Maximum cooling state for this trip point.
1243 * THERMAL_NO_LIMIT means no upper limit,
1244 * and the cooling device can be in max_state.
1245 * @lower: the Minimum cooling state can be used for this trip point.
1246 * THERMAL_NO_LIMIT means no lower limit,
1247 * and the cooling device can be in cooling state 0.
1248 * @weight: The weight of the cooling device to be bound to the
1249 * thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
1252 * This interface function bind a thermal cooling device to the certain trip
1253 * point of a thermal zone device.
1254 * This function is usually called in the thermal zone device .bind callback.
1256 * Return: 0 on success, the proper error value otherwise.
1258 int thermal_zone_bind_cooling_device(struct thermal_zone_device
*tz
,
1260 struct thermal_cooling_device
*cdev
,
1261 unsigned long upper
, unsigned long lower
,
1262 unsigned int weight
)
1264 struct thermal_instance
*dev
;
1265 struct thermal_instance
*pos
;
1266 struct thermal_zone_device
*pos1
;
1267 struct thermal_cooling_device
*pos2
;
1268 unsigned long max_state
;
1271 if (trip
>= tz
->trips
|| (trip
< 0 && trip
!= THERMAL_TRIPS_NONE
))
1274 list_for_each_entry(pos1
, &thermal_tz_list
, node
) {
1278 list_for_each_entry(pos2
, &thermal_cdev_list
, node
) {
1283 if (tz
!= pos1
|| cdev
!= pos2
)
1286 ret
= cdev
->ops
->get_max_state(cdev
, &max_state
);
1290 /* lower default 0, upper default max_state */
1291 lower
= lower
== THERMAL_NO_LIMIT
? 0 : lower
;
1292 upper
= upper
== THERMAL_NO_LIMIT
? max_state
: upper
;
1294 if (lower
> upper
|| upper
> max_state
)
1298 kzalloc(sizeof(struct thermal_instance
), GFP_KERNEL
);
1306 dev
->target
= THERMAL_NO_TARGET
;
1307 dev
->weight
= weight
;
1309 result
= get_idr(&tz
->idr
, &tz
->lock
, &dev
->id
);
1313 sprintf(dev
->name
, "cdev%d", dev
->id
);
1315 sysfs_create_link(&tz
->device
.kobj
, &cdev
->device
.kobj
, dev
->name
);
1319 sprintf(dev
->attr_name
, "cdev%d_trip_point", dev
->id
);
1320 sysfs_attr_init(&dev
->attr
.attr
);
1321 dev
->attr
.attr
.name
= dev
->attr_name
;
1322 dev
->attr
.attr
.mode
= 0444;
1323 dev
->attr
.show
= thermal_cooling_device_trip_point_show
;
1324 result
= device_create_file(&tz
->device
, &dev
->attr
);
1326 goto remove_symbol_link
;
1328 sprintf(dev
->weight_attr_name
, "cdev%d_weight", dev
->id
);
1329 sysfs_attr_init(&dev
->weight_attr
.attr
);
1330 dev
->weight_attr
.attr
.name
= dev
->weight_attr_name
;
1331 dev
->weight_attr
.attr
.mode
= S_IWUSR
| S_IRUGO
;
1332 dev
->weight_attr
.show
= thermal_cooling_device_weight_show
;
1333 dev
->weight_attr
.store
= thermal_cooling_device_weight_store
;
1334 result
= device_create_file(&tz
->device
, &dev
->weight_attr
);
1336 goto remove_trip_file
;
1338 mutex_lock(&tz
->lock
);
1339 mutex_lock(&cdev
->lock
);
1340 list_for_each_entry(pos
, &tz
->thermal_instances
, tz_node
)
1341 if (pos
->tz
== tz
&& pos
->trip
== trip
&& pos
->cdev
== cdev
) {
1346 list_add_tail(&dev
->tz_node
, &tz
->thermal_instances
);
1347 list_add_tail(&dev
->cdev_node
, &cdev
->thermal_instances
);
1348 atomic_set(&tz
->need_update
, 1);
1350 mutex_unlock(&cdev
->lock
);
1351 mutex_unlock(&tz
->lock
);
1356 device_remove_file(&tz
->device
, &dev
->weight_attr
);
1358 device_remove_file(&tz
->device
, &dev
->attr
);
1360 sysfs_remove_link(&tz
->device
.kobj
, dev
->name
);
1362 release_idr(&tz
->idr
, &tz
->lock
, dev
->id
);
1367 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device
);
1370 * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1372 * @tz: pointer to a struct thermal_zone_device.
1373 * @trip: indicates which trip point the cooling devices is
1374 * associated with in this thermal zone.
1375 * @cdev: pointer to a struct thermal_cooling_device.
1377 * This interface function unbind a thermal cooling device from the certain
1378 * trip point of a thermal zone device.
1379 * This function is usually called in the thermal zone device .unbind callback.
1381 * Return: 0 on success, the proper error value otherwise.
1383 int thermal_zone_unbind_cooling_device(struct thermal_zone_device
*tz
,
1385 struct thermal_cooling_device
*cdev
)
1387 struct thermal_instance
*pos
, *next
;
1389 mutex_lock(&tz
->lock
);
1390 mutex_lock(&cdev
->lock
);
1391 list_for_each_entry_safe(pos
, next
, &tz
->thermal_instances
, tz_node
) {
1392 if (pos
->tz
== tz
&& pos
->trip
== trip
&& pos
->cdev
== cdev
) {
1393 list_del(&pos
->tz_node
);
1394 list_del(&pos
->cdev_node
);
1395 mutex_unlock(&cdev
->lock
);
1396 mutex_unlock(&tz
->lock
);
1400 mutex_unlock(&cdev
->lock
);
1401 mutex_unlock(&tz
->lock
);
1406 device_remove_file(&tz
->device
, &pos
->weight_attr
);
1407 device_remove_file(&tz
->device
, &pos
->attr
);
1408 sysfs_remove_link(&tz
->device
.kobj
, pos
->name
);
1409 release_idr(&tz
->idr
, &tz
->lock
, pos
->id
);
1413 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device
);
1415 static void thermal_release(struct device
*dev
)
1417 struct thermal_zone_device
*tz
;
1418 struct thermal_cooling_device
*cdev
;
1420 if (!strncmp(dev_name(dev
), "thermal_zone",
1421 sizeof("thermal_zone") - 1)) {
1422 tz
= to_thermal_zone(dev
);
1424 } else if(!strncmp(dev_name(dev
), "cooling_device",
1425 sizeof("cooling_device") - 1)){
1426 cdev
= to_cooling_device(dev
);
1431 static struct class thermal_class
= {
1433 .dev_release
= thermal_release
,
1437 * __thermal_cooling_device_register() - register a new thermal cooling device
1438 * @np: a pointer to a device tree node.
1439 * @type: the thermal cooling device type.
1440 * @devdata: device private data.
1441 * @ops: standard thermal cooling devices callbacks.
1443 * This interface function adds a new thermal cooling device (fan/processor/...)
1444 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1445 * to all the thermal zone devices registered at the same time.
1446 * It also gives the opportunity to link the cooling device to a device tree
1447 * node, so that it can be bound to a thermal zone created out of device tree.
1449 * Return: a pointer to the created struct thermal_cooling_device or an
1450 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1452 static struct thermal_cooling_device
*
1453 __thermal_cooling_device_register(struct device_node
*np
,
1454 char *type
, void *devdata
,
1455 const struct thermal_cooling_device_ops
*ops
)
1457 struct thermal_cooling_device
*cdev
;
1458 struct thermal_zone_device
*pos
= NULL
;
1461 if (type
&& strlen(type
) >= THERMAL_NAME_LENGTH
)
1462 return ERR_PTR(-EINVAL
);
1464 if (!ops
|| !ops
->get_max_state
|| !ops
->get_cur_state
||
1465 !ops
->set_cur_state
)
1466 return ERR_PTR(-EINVAL
);
1468 cdev
= kzalloc(sizeof(struct thermal_cooling_device
), GFP_KERNEL
);
1470 return ERR_PTR(-ENOMEM
);
1472 result
= get_idr(&thermal_cdev_idr
, &thermal_idr_lock
, &cdev
->id
);
1475 return ERR_PTR(result
);
1478 strlcpy(cdev
->type
, type
? : "", sizeof(cdev
->type
));
1479 mutex_init(&cdev
->lock
);
1480 INIT_LIST_HEAD(&cdev
->thermal_instances
);
1483 cdev
->updated
= false;
1484 cdev
->device
.class = &thermal_class
;
1485 cdev
->device
.groups
= cooling_device_attr_groups
;
1486 cdev
->devdata
= devdata
;
1487 dev_set_name(&cdev
->device
, "cooling_device%d", cdev
->id
);
1488 result
= device_register(&cdev
->device
);
1490 release_idr(&thermal_cdev_idr
, &thermal_idr_lock
, cdev
->id
);
1492 return ERR_PTR(result
);
1495 /* Add 'this' new cdev to the global cdev list */
1496 mutex_lock(&thermal_list_lock
);
1497 list_add(&cdev
->node
, &thermal_cdev_list
);
1498 mutex_unlock(&thermal_list_lock
);
1500 /* Update binding information for 'this' new cdev */
1503 mutex_lock(&thermal_list_lock
);
1504 list_for_each_entry(pos
, &thermal_tz_list
, node
)
1505 if (atomic_cmpxchg(&pos
->need_update
, 1, 0))
1506 thermal_zone_device_update(pos
);
1507 mutex_unlock(&thermal_list_lock
);
1513 * thermal_cooling_device_register() - register a new thermal cooling device
1514 * @type: the thermal cooling device type.
1515 * @devdata: device private data.
1516 * @ops: standard thermal cooling devices callbacks.
1518 * This interface function adds a new thermal cooling device (fan/processor/...)
1519 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1520 * to all the thermal zone devices registered at the same time.
1522 * Return: a pointer to the created struct thermal_cooling_device or an
1523 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1525 struct thermal_cooling_device
*
1526 thermal_cooling_device_register(char *type
, void *devdata
,
1527 const struct thermal_cooling_device_ops
*ops
)
1529 return __thermal_cooling_device_register(NULL
, type
, devdata
, ops
);
1531 EXPORT_SYMBOL_GPL(thermal_cooling_device_register
);
1534 * thermal_of_cooling_device_register() - register an OF thermal cooling device
1535 * @np: a pointer to a device tree node.
1536 * @type: the thermal cooling device type.
1537 * @devdata: device private data.
1538 * @ops: standard thermal cooling devices callbacks.
1540 * This function will register a cooling device with device tree node reference.
1541 * This interface function adds a new thermal cooling device (fan/processor/...)
1542 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1543 * to all the thermal zone devices registered at the same time.
1545 * Return: a pointer to the created struct thermal_cooling_device or an
1546 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1548 struct thermal_cooling_device
*
1549 thermal_of_cooling_device_register(struct device_node
*np
,
1550 char *type
, void *devdata
,
1551 const struct thermal_cooling_device_ops
*ops
)
1553 return __thermal_cooling_device_register(np
, type
, devdata
, ops
);
1555 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register
);
1558 * thermal_cooling_device_unregister - removes the registered thermal cooling device
1559 * @cdev: the thermal cooling device to remove.
1561 * thermal_cooling_device_unregister() must be called when the device is no
1564 void thermal_cooling_device_unregister(struct thermal_cooling_device
*cdev
)
1567 const struct thermal_zone_params
*tzp
;
1568 struct thermal_zone_device
*tz
;
1569 struct thermal_cooling_device
*pos
= NULL
;
1574 mutex_lock(&thermal_list_lock
);
1575 list_for_each_entry(pos
, &thermal_cdev_list
, node
)
1579 /* thermal cooling device not found */
1580 mutex_unlock(&thermal_list_lock
);
1583 list_del(&cdev
->node
);
1585 /* Unbind all thermal zones associated with 'this' cdev */
1586 list_for_each_entry(tz
, &thermal_tz_list
, node
) {
1587 if (tz
->ops
->unbind
) {
1588 tz
->ops
->unbind(tz
, cdev
);
1592 if (!tz
->tzp
|| !tz
->tzp
->tbp
)
1596 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
1597 if (tzp
->tbp
[i
].cdev
== cdev
) {
1598 __unbind(tz
, tzp
->tbp
[i
].trip_mask
, cdev
);
1599 tzp
->tbp
[i
].cdev
= NULL
;
1604 mutex_unlock(&thermal_list_lock
);
1607 device_remove_file(&cdev
->device
, &dev_attr_cdev_type
);
1608 device_remove_file(&cdev
->device
, &dev_attr_max_state
);
1609 device_remove_file(&cdev
->device
, &dev_attr_cur_state
);
1611 release_idr(&thermal_cdev_idr
, &thermal_idr_lock
, cdev
->id
);
1612 device_unregister(&cdev
->device
);
1615 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister
);
1617 void thermal_cdev_update(struct thermal_cooling_device
*cdev
)
1619 struct thermal_instance
*instance
;
1620 unsigned long target
= 0;
1622 /* cooling device is updated*/
1626 mutex_lock(&cdev
->lock
);
1627 /* Make sure cdev enters the deepest cooling state */
1628 list_for_each_entry(instance
, &cdev
->thermal_instances
, cdev_node
) {
1629 dev_dbg(&cdev
->device
, "zone%d->target=%lu\n",
1630 instance
->tz
->id
, instance
->target
);
1631 if (instance
->target
== THERMAL_NO_TARGET
)
1633 if (instance
->target
> target
)
1634 target
= instance
->target
;
1636 mutex_unlock(&cdev
->lock
);
1637 cdev
->ops
->set_cur_state(cdev
, target
);
1638 cdev
->updated
= true;
1639 trace_cdev_update(cdev
, target
);
1640 dev_dbg(&cdev
->device
, "set to state %lu\n", target
);
1642 EXPORT_SYMBOL(thermal_cdev_update
);
1645 * thermal_notify_framework - Sensor drivers use this API to notify framework
1646 * @tz: thermal zone device
1647 * @trip: indicates which trip point has been crossed
1649 * This function handles the trip events from sensor drivers. It starts
1650 * throttling the cooling devices according to the policy configured.
1651 * For CRITICAL and HOT trip points, this notifies the respective drivers,
1652 * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1653 * The throttling policy is based on the configured platform data; if no
1654 * platform data is provided, this uses the step_wise throttling policy.
1656 void thermal_notify_framework(struct thermal_zone_device
*tz
, int trip
)
1658 handle_thermal_trip(tz
, trip
);
1660 EXPORT_SYMBOL_GPL(thermal_notify_framework
);
1663 * create_trip_attrs() - create attributes for trip points
1664 * @tz: the thermal zone device
1665 * @mask: Writeable trip point bitmap.
1667 * helper function to instantiate sysfs entries for every trip
1668 * point and its properties of a struct thermal_zone_device.
1670 * Return: 0 on success, the proper error value otherwise.
1672 static int create_trip_attrs(struct thermal_zone_device
*tz
, int mask
)
1675 int size
= sizeof(struct thermal_attr
) * tz
->trips
;
1677 tz
->trip_type_attrs
= kzalloc(size
, GFP_KERNEL
);
1678 if (!tz
->trip_type_attrs
)
1681 tz
->trip_temp_attrs
= kzalloc(size
, GFP_KERNEL
);
1682 if (!tz
->trip_temp_attrs
) {
1683 kfree(tz
->trip_type_attrs
);
1687 if (tz
->ops
->get_trip_hyst
) {
1688 tz
->trip_hyst_attrs
= kzalloc(size
, GFP_KERNEL
);
1689 if (!tz
->trip_hyst_attrs
) {
1690 kfree(tz
->trip_type_attrs
);
1691 kfree(tz
->trip_temp_attrs
);
1697 for (indx
= 0; indx
< tz
->trips
; indx
++) {
1698 /* create trip type attribute */
1699 snprintf(tz
->trip_type_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1700 "trip_point_%d_type", indx
);
1702 sysfs_attr_init(&tz
->trip_type_attrs
[indx
].attr
.attr
);
1703 tz
->trip_type_attrs
[indx
].attr
.attr
.name
=
1704 tz
->trip_type_attrs
[indx
].name
;
1705 tz
->trip_type_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1706 tz
->trip_type_attrs
[indx
].attr
.show
= trip_point_type_show
;
1708 device_create_file(&tz
->device
,
1709 &tz
->trip_type_attrs
[indx
].attr
);
1711 /* create trip temp attribute */
1712 snprintf(tz
->trip_temp_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1713 "trip_point_%d_temp", indx
);
1715 sysfs_attr_init(&tz
->trip_temp_attrs
[indx
].attr
.attr
);
1716 tz
->trip_temp_attrs
[indx
].attr
.attr
.name
=
1717 tz
->trip_temp_attrs
[indx
].name
;
1718 tz
->trip_temp_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1719 tz
->trip_temp_attrs
[indx
].attr
.show
= trip_point_temp_show
;
1720 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS
) &&
1721 mask
& (1 << indx
)) {
1722 tz
->trip_temp_attrs
[indx
].attr
.attr
.mode
|= S_IWUSR
;
1723 tz
->trip_temp_attrs
[indx
].attr
.store
=
1724 trip_point_temp_store
;
1727 device_create_file(&tz
->device
,
1728 &tz
->trip_temp_attrs
[indx
].attr
);
1730 /* create Optional trip hyst attribute */
1731 if (!tz
->ops
->get_trip_hyst
)
1733 snprintf(tz
->trip_hyst_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1734 "trip_point_%d_hyst", indx
);
1736 sysfs_attr_init(&tz
->trip_hyst_attrs
[indx
].attr
.attr
);
1737 tz
->trip_hyst_attrs
[indx
].attr
.attr
.name
=
1738 tz
->trip_hyst_attrs
[indx
].name
;
1739 tz
->trip_hyst_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1740 tz
->trip_hyst_attrs
[indx
].attr
.show
= trip_point_hyst_show
;
1741 if (tz
->ops
->set_trip_hyst
) {
1742 tz
->trip_hyst_attrs
[indx
].attr
.attr
.mode
|= S_IWUSR
;
1743 tz
->trip_hyst_attrs
[indx
].attr
.store
=
1744 trip_point_hyst_store
;
1747 device_create_file(&tz
->device
,
1748 &tz
->trip_hyst_attrs
[indx
].attr
);
1753 static void remove_trip_attrs(struct thermal_zone_device
*tz
)
1757 for (indx
= 0; indx
< tz
->trips
; indx
++) {
1758 device_remove_file(&tz
->device
,
1759 &tz
->trip_type_attrs
[indx
].attr
);
1760 device_remove_file(&tz
->device
,
1761 &tz
->trip_temp_attrs
[indx
].attr
);
1762 if (tz
->ops
->get_trip_hyst
)
1763 device_remove_file(&tz
->device
,
1764 &tz
->trip_hyst_attrs
[indx
].attr
);
1766 kfree(tz
->trip_type_attrs
);
1767 kfree(tz
->trip_temp_attrs
);
1768 kfree(tz
->trip_hyst_attrs
);
1772 * thermal_zone_device_register() - register a new thermal zone device
1773 * @type: the thermal zone device type
1774 * @trips: the number of trip points the thermal zone support
1775 * @mask: a bit string indicating the writeablility of trip points
1776 * @devdata: private device data
1777 * @ops: standard thermal zone device callbacks
1778 * @tzp: thermal zone platform parameters
1779 * @passive_delay: number of milliseconds to wait between polls when
1780 * performing passive cooling
1781 * @polling_delay: number of milliseconds to wait between polls when checking
1782 * whether trip points have been crossed (0 for interrupt
1785 * This interface function adds a new thermal zone device (sensor) to
1786 * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1787 * thermal cooling devices registered at the same time.
1788 * thermal_zone_device_unregister() must be called when the device is no
1789 * longer needed. The passive cooling depends on the .get_trend() return value.
1791 * Return: a pointer to the created struct thermal_zone_device or an
1792 * in case of error, an ERR_PTR. Caller must check return value with
1793 * IS_ERR*() helpers.
1795 struct thermal_zone_device
*thermal_zone_device_register(const char *type
,
1796 int trips
, int mask
, void *devdata
,
1797 struct thermal_zone_device_ops
*ops
,
1798 struct thermal_zone_params
*tzp
,
1799 int passive_delay
, int polling_delay
)
1801 struct thermal_zone_device
*tz
;
1802 enum thermal_trip_type trip_type
;
1806 struct thermal_governor
*governor
;
1808 if (type
&& strlen(type
) >= THERMAL_NAME_LENGTH
)
1809 return ERR_PTR(-EINVAL
);
1811 if (trips
> THERMAL_MAX_TRIPS
|| trips
< 0 || mask
>> trips
)
1812 return ERR_PTR(-EINVAL
);
1815 return ERR_PTR(-EINVAL
);
1817 if (trips
> 0 && (!ops
->get_trip_type
|| !ops
->get_trip_temp
))
1818 return ERR_PTR(-EINVAL
);
1820 tz
= kzalloc(sizeof(struct thermal_zone_device
), GFP_KERNEL
);
1822 return ERR_PTR(-ENOMEM
);
1824 INIT_LIST_HEAD(&tz
->thermal_instances
);
1826 mutex_init(&tz
->lock
);
1827 result
= get_idr(&thermal_tz_idr
, &thermal_idr_lock
, &tz
->id
);
1830 return ERR_PTR(result
);
1833 strlcpy(tz
->type
, type
? : "", sizeof(tz
->type
));
1836 tz
->device
.class = &thermal_class
;
1837 tz
->devdata
= devdata
;
1839 tz
->passive_delay
= passive_delay
;
1840 tz
->polling_delay
= polling_delay
;
1841 /* A new thermal zone needs to be updated anyway. */
1842 atomic_set(&tz
->need_update
, 1);
1844 dev_set_name(&tz
->device
, "thermal_zone%d", tz
->id
);
1845 result
= device_register(&tz
->device
);
1847 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
1849 return ERR_PTR(result
);
1854 result
= device_create_file(&tz
->device
, &dev_attr_type
);
1859 result
= device_create_file(&tz
->device
, &dev_attr_temp
);
1863 if (ops
->get_mode
) {
1864 result
= device_create_file(&tz
->device
, &dev_attr_mode
);
1869 result
= create_trip_attrs(tz
, mask
);
1873 for (count
= 0; count
< trips
; count
++) {
1874 tz
->ops
->get_trip_type(tz
, count
, &trip_type
);
1875 if (trip_type
== THERMAL_TRIP_PASSIVE
)
1880 result
= device_create_file(&tz
->device
, &dev_attr_passive
);
1885 if (IS_ENABLED(CONFIG_THERMAL_EMULATION
)) {
1886 result
= device_create_file(&tz
->device
, &dev_attr_emul_temp
);
1891 /* Create policy attribute */
1892 result
= device_create_file(&tz
->device
, &dev_attr_policy
);
1896 /* Add thermal zone params */
1897 result
= create_tzp_attrs(&tz
->device
);
1901 /* Create available_policies attribute */
1902 result
= device_create_file(&tz
->device
, &dev_attr_available_policies
);
1906 /* Update 'this' zone's governor information */
1907 mutex_lock(&thermal_governor_lock
);
1910 governor
= __find_governor(tz
->tzp
->governor_name
);
1912 governor
= def_governor
;
1914 result
= thermal_set_governor(tz
, governor
);
1916 mutex_unlock(&thermal_governor_lock
);
1920 mutex_unlock(&thermal_governor_lock
);
1922 if (!tz
->tzp
|| !tz
->tzp
->no_hwmon
) {
1923 result
= thermal_add_hwmon_sysfs(tz
);
1928 mutex_lock(&thermal_list_lock
);
1929 list_add_tail(&tz
->node
, &thermal_tz_list
);
1930 mutex_unlock(&thermal_list_lock
);
1932 /* Bind cooling devices for this zone */
1935 INIT_DELAYED_WORK(&(tz
->poll_queue
), thermal_zone_device_check
);
1937 thermal_zone_device_reset(tz
);
1938 /* Update the new thermal zone and mark it as already updated. */
1939 if (atomic_cmpxchg(&tz
->need_update
, 1, 0))
1940 thermal_zone_device_update(tz
);
1945 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
1946 device_unregister(&tz
->device
);
1947 return ERR_PTR(result
);
1949 EXPORT_SYMBOL_GPL(thermal_zone_device_register
);
1952 * thermal_device_unregister - removes the registered thermal zone device
1953 * @tz: the thermal zone device to remove
1955 void thermal_zone_device_unregister(struct thermal_zone_device
*tz
)
1958 const struct thermal_zone_params
*tzp
;
1959 struct thermal_cooling_device
*cdev
;
1960 struct thermal_zone_device
*pos
= NULL
;
1967 mutex_lock(&thermal_list_lock
);
1968 list_for_each_entry(pos
, &thermal_tz_list
, node
)
1972 /* thermal zone device not found */
1973 mutex_unlock(&thermal_list_lock
);
1976 list_del(&tz
->node
);
1978 /* Unbind all cdevs associated with 'this' thermal zone */
1979 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
1980 if (tz
->ops
->unbind
) {
1981 tz
->ops
->unbind(tz
, cdev
);
1985 if (!tzp
|| !tzp
->tbp
)
1988 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
1989 if (tzp
->tbp
[i
].cdev
== cdev
) {
1990 __unbind(tz
, tzp
->tbp
[i
].trip_mask
, cdev
);
1991 tzp
->tbp
[i
].cdev
= NULL
;
1996 mutex_unlock(&thermal_list_lock
);
1998 thermal_zone_device_set_polling(tz
, 0);
2001 device_remove_file(&tz
->device
, &dev_attr_type
);
2002 device_remove_file(&tz
->device
, &dev_attr_temp
);
2003 if (tz
->ops
->get_mode
)
2004 device_remove_file(&tz
->device
, &dev_attr_mode
);
2005 device_remove_file(&tz
->device
, &dev_attr_policy
);
2006 device_remove_file(&tz
->device
, &dev_attr_available_policies
);
2007 remove_trip_attrs(tz
);
2008 thermal_set_governor(tz
, NULL
);
2010 thermal_remove_hwmon_sysfs(tz
);
2011 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
2012 idr_destroy(&tz
->idr
);
2013 mutex_destroy(&tz
->lock
);
2014 device_unregister(&tz
->device
);
2017 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister
);
2020 * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
2021 * @name: thermal zone name to fetch the temperature
2023 * When only one zone is found with the passed name, returns a reference to it.
2025 * Return: On success returns a reference to an unique thermal zone with
2026 * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
2027 * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
2029 struct thermal_zone_device
*thermal_zone_get_zone_by_name(const char *name
)
2031 struct thermal_zone_device
*pos
= NULL
, *ref
= ERR_PTR(-EINVAL
);
2032 unsigned int found
= 0;
2037 mutex_lock(&thermal_list_lock
);
2038 list_for_each_entry(pos
, &thermal_tz_list
, node
)
2039 if (!strncasecmp(name
, pos
->type
, THERMAL_NAME_LENGTH
)) {
2043 mutex_unlock(&thermal_list_lock
);
2045 /* nothing has been found, thus an error code for it */
2047 ref
= ERR_PTR(-ENODEV
);
2049 /* Success only when an unique zone is found */
2050 ref
= ERR_PTR(-EEXIST
);
2055 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name
);
2058 static const struct genl_multicast_group thermal_event_mcgrps
[] = {
2059 { .name
= THERMAL_GENL_MCAST_GROUP_NAME
, },
2062 static struct genl_family thermal_event_genl_family
= {
2063 .id
= GENL_ID_GENERATE
,
2064 .name
= THERMAL_GENL_FAMILY_NAME
,
2065 .version
= THERMAL_GENL_VERSION
,
2066 .maxattr
= THERMAL_GENL_ATTR_MAX
,
2067 .mcgrps
= thermal_event_mcgrps
,
2068 .n_mcgrps
= ARRAY_SIZE(thermal_event_mcgrps
),
2071 int thermal_generate_netlink_event(struct thermal_zone_device
*tz
,
2074 struct sk_buff
*skb
;
2075 struct nlattr
*attr
;
2076 struct thermal_genl_event
*thermal_event
;
2080 static unsigned int thermal_event_seqnum
;
2085 /* allocate memory */
2086 size
= nla_total_size(sizeof(struct thermal_genl_event
)) +
2089 skb
= genlmsg_new(size
, GFP_ATOMIC
);
2093 /* add the genetlink message header */
2094 msg_header
= genlmsg_put(skb
, 0, thermal_event_seqnum
++,
2095 &thermal_event_genl_family
, 0,
2096 THERMAL_GENL_CMD_EVENT
);
2103 attr
= nla_reserve(skb
, THERMAL_GENL_ATTR_EVENT
,
2104 sizeof(struct thermal_genl_event
));
2111 thermal_event
= nla_data(attr
);
2112 if (!thermal_event
) {
2117 memset(thermal_event
, 0, sizeof(struct thermal_genl_event
));
2119 thermal_event
->orig
= tz
->id
;
2120 thermal_event
->event
= event
;
2122 /* send multicast genetlink message */
2123 genlmsg_end(skb
, msg_header
);
2125 result
= genlmsg_multicast(&thermal_event_genl_family
, skb
, 0,
2128 dev_err(&tz
->device
, "Failed to send netlink event:%d", result
);
2132 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event
);
2134 static int genetlink_init(void)
2136 return genl_register_family(&thermal_event_genl_family
);
2139 static void genetlink_exit(void)
2141 genl_unregister_family(&thermal_event_genl_family
);
2143 #else /* !CONFIG_NET */
2144 static inline int genetlink_init(void) { return 0; }
2145 static inline void genetlink_exit(void) {}
2146 #endif /* !CONFIG_NET */
2148 static int __init
thermal_register_governors(void)
2152 result
= thermal_gov_step_wise_register();
2156 result
= thermal_gov_fair_share_register();
2160 result
= thermal_gov_bang_bang_register();
2164 result
= thermal_gov_user_space_register();
2168 return thermal_gov_power_allocator_register();
2171 static void thermal_unregister_governors(void)
2173 thermal_gov_step_wise_unregister();
2174 thermal_gov_fair_share_unregister();
2175 thermal_gov_bang_bang_unregister();
2176 thermal_gov_user_space_unregister();
2177 thermal_gov_power_allocator_unregister();
2180 static int thermal_pm_notify(struct notifier_block
*nb
,
2181 unsigned long mode
, void *_unused
)
2183 struct thermal_zone_device
*tz
;
2186 case PM_HIBERNATION_PREPARE
:
2187 case PM_RESTORE_PREPARE
:
2188 case PM_SUSPEND_PREPARE
:
2189 atomic_set(&in_suspend
, 1);
2191 case PM_POST_HIBERNATION
:
2192 case PM_POST_RESTORE
:
2193 case PM_POST_SUSPEND
:
2194 atomic_set(&in_suspend
, 0);
2195 list_for_each_entry(tz
, &thermal_tz_list
, node
) {
2196 thermal_zone_device_reset(tz
);
2197 thermal_zone_device_update(tz
);
2206 static struct notifier_block thermal_pm_nb
= {
2207 .notifier_call
= thermal_pm_notify
,
2210 static int __init
thermal_init(void)
2214 result
= thermal_register_governors();
2218 result
= class_register(&thermal_class
);
2220 goto unregister_governors
;
2222 result
= genetlink_init();
2224 goto unregister_class
;
2226 result
= of_parse_thermal_zones();
2230 result
= register_pm_notifier(&thermal_pm_nb
);
2232 pr_warn("Thermal: Can not register suspend notifier, return %d\n",
2240 class_unregister(&thermal_class
);
2241 unregister_governors
:
2242 thermal_unregister_governors();
2244 idr_destroy(&thermal_tz_idr
);
2245 idr_destroy(&thermal_cdev_idr
);
2246 mutex_destroy(&thermal_idr_lock
);
2247 mutex_destroy(&thermal_list_lock
);
2248 mutex_destroy(&thermal_governor_lock
);
2252 static void __exit
thermal_exit(void)
2254 unregister_pm_notifier(&thermal_pm_nb
);
2255 of_thermal_destroy_zones();
2257 class_unregister(&thermal_class
);
2258 thermal_unregister_governors();
2259 idr_destroy(&thermal_tz_idr
);
2260 idr_destroy(&thermal_cdev_idr
);
2261 mutex_destroy(&thermal_idr_lock
);
2262 mutex_destroy(&thermal_list_lock
);
2263 mutex_destroy(&thermal_governor_lock
);
2266 fs_initcall(thermal_init
);
2267 module_exit(thermal_exit
);