2 * thermal.c - Generic Thermal Management Sysfs support.
4 * Copyright (C) 2008 Intel Corp
5 * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
6 * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2 of the License.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
28 #include <linux/module.h>
29 #include <linux/device.h>
30 #include <linux/err.h>
31 #include <linux/slab.h>
32 #include <linux/kdev_t.h>
33 #include <linux/idr.h>
34 #include <linux/thermal.h>
35 #include <linux/reboot.h>
36 #include <linux/string.h>
38 #include <net/netlink.h>
39 #include <net/genetlink.h>
41 #define CREATE_TRACE_POINTS
42 #include <trace/events/thermal.h>
44 #include "thermal_core.h"
45 #include "thermal_hwmon.h"
47 MODULE_AUTHOR("Zhang Rui");
48 MODULE_DESCRIPTION("Generic thermal management sysfs support");
49 MODULE_LICENSE("GPL v2");
51 static DEFINE_IDR(thermal_tz_idr
);
52 static DEFINE_IDR(thermal_cdev_idr
);
53 static DEFINE_MUTEX(thermal_idr_lock
);
55 static LIST_HEAD(thermal_tz_list
);
56 static LIST_HEAD(thermal_cdev_list
);
57 static LIST_HEAD(thermal_governor_list
);
59 static DEFINE_MUTEX(thermal_list_lock
);
60 static DEFINE_MUTEX(thermal_governor_lock
);
62 static struct thermal_governor
*def_governor
;
64 static struct thermal_governor
*__find_governor(const char *name
)
66 struct thermal_governor
*pos
;
68 if (!name
|| !name
[0])
71 list_for_each_entry(pos
, &thermal_governor_list
, governor_list
)
72 if (!strncasecmp(name
, pos
->name
, THERMAL_NAME_LENGTH
))
79 * bind_previous_governor() - bind the previous governor of the thermal zone
80 * @tz: a valid pointer to a struct thermal_zone_device
81 * @failed_gov_name: the name of the governor that failed to register
83 * Register the previous governor of the thermal zone after a new
84 * governor has failed to be bound.
86 static void bind_previous_governor(struct thermal_zone_device
*tz
,
87 const char *failed_gov_name
)
89 if (tz
->governor
&& tz
->governor
->bind_to_tz
) {
90 if (tz
->governor
->bind_to_tz(tz
)) {
92 "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n",
93 failed_gov_name
, tz
->governor
->name
, tz
->type
);
100 * thermal_set_governor() - Switch to another governor
101 * @tz: a valid pointer to a struct thermal_zone_device
102 * @new_gov: pointer to the new governor
104 * Change the governor of thermal zone @tz.
106 * Return: 0 on success, an error if the new governor's bind_to_tz() failed.
108 static int thermal_set_governor(struct thermal_zone_device
*tz
,
109 struct thermal_governor
*new_gov
)
113 if (tz
->governor
&& tz
->governor
->unbind_from_tz
)
114 tz
->governor
->unbind_from_tz(tz
);
116 if (new_gov
&& new_gov
->bind_to_tz
) {
117 ret
= new_gov
->bind_to_tz(tz
);
119 bind_previous_governor(tz
, new_gov
->name
);
125 tz
->governor
= new_gov
;
130 int thermal_register_governor(struct thermal_governor
*governor
)
134 struct thermal_zone_device
*pos
;
139 mutex_lock(&thermal_governor_lock
);
142 if (__find_governor(governor
->name
) == NULL
) {
144 list_add(&governor
->governor_list
, &thermal_governor_list
);
145 if (!def_governor
&& !strncmp(governor
->name
,
146 DEFAULT_THERMAL_GOVERNOR
, THERMAL_NAME_LENGTH
))
147 def_governor
= governor
;
150 mutex_lock(&thermal_list_lock
);
152 list_for_each_entry(pos
, &thermal_tz_list
, node
) {
154 * only thermal zones with specified tz->tzp->governor_name
155 * may run with tz->govenor unset
160 name
= pos
->tzp
->governor_name
;
162 if (!strncasecmp(name
, governor
->name
, THERMAL_NAME_LENGTH
)) {
165 ret
= thermal_set_governor(pos
, governor
);
167 dev_err(&pos
->device
,
168 "Failed to set governor %s for thermal zone %s: %d\n",
169 governor
->name
, pos
->type
, ret
);
173 mutex_unlock(&thermal_list_lock
);
174 mutex_unlock(&thermal_governor_lock
);
179 void thermal_unregister_governor(struct thermal_governor
*governor
)
181 struct thermal_zone_device
*pos
;
186 mutex_lock(&thermal_governor_lock
);
188 if (__find_governor(governor
->name
) == NULL
)
191 mutex_lock(&thermal_list_lock
);
193 list_for_each_entry(pos
, &thermal_tz_list
, node
) {
194 if (!strncasecmp(pos
->governor
->name
, governor
->name
,
195 THERMAL_NAME_LENGTH
))
196 thermal_set_governor(pos
, NULL
);
199 mutex_unlock(&thermal_list_lock
);
200 list_del(&governor
->governor_list
);
202 mutex_unlock(&thermal_governor_lock
);
206 static int get_idr(struct idr
*idr
, struct mutex
*lock
, int *id
)
212 ret
= idr_alloc(idr
, NULL
, 0, 0, GFP_KERNEL
);
215 if (unlikely(ret
< 0))
221 static void release_idr(struct idr
*idr
, struct mutex
*lock
, int id
)
230 int get_tz_trend(struct thermal_zone_device
*tz
, int trip
)
232 enum thermal_trend trend
;
234 if (tz
->emul_temperature
|| !tz
->ops
->get_trend
||
235 tz
->ops
->get_trend(tz
, trip
, &trend
)) {
236 if (tz
->temperature
> tz
->last_temperature
)
237 trend
= THERMAL_TREND_RAISING
;
238 else if (tz
->temperature
< tz
->last_temperature
)
239 trend
= THERMAL_TREND_DROPPING
;
241 trend
= THERMAL_TREND_STABLE
;
246 EXPORT_SYMBOL(get_tz_trend
);
248 struct thermal_instance
*get_thermal_instance(struct thermal_zone_device
*tz
,
249 struct thermal_cooling_device
*cdev
, int trip
)
251 struct thermal_instance
*pos
= NULL
;
252 struct thermal_instance
*target_instance
= NULL
;
254 mutex_lock(&tz
->lock
);
255 mutex_lock(&cdev
->lock
);
257 list_for_each_entry(pos
, &tz
->thermal_instances
, tz_node
) {
258 if (pos
->tz
== tz
&& pos
->trip
== trip
&& pos
->cdev
== cdev
) {
259 target_instance
= pos
;
264 mutex_unlock(&cdev
->lock
);
265 mutex_unlock(&tz
->lock
);
267 return target_instance
;
269 EXPORT_SYMBOL(get_thermal_instance
);
271 static void print_bind_err_msg(struct thermal_zone_device
*tz
,
272 struct thermal_cooling_device
*cdev
, int ret
)
274 dev_err(&tz
->device
, "binding zone %s with cdev %s failed:%d\n",
275 tz
->type
, cdev
->type
, ret
);
278 static void __bind(struct thermal_zone_device
*tz
, int mask
,
279 struct thermal_cooling_device
*cdev
,
280 unsigned long *limits
,
285 for (i
= 0; i
< tz
->trips
; i
++) {
286 if (mask
& (1 << i
)) {
287 unsigned long upper
, lower
;
289 upper
= THERMAL_NO_LIMIT
;
290 lower
= THERMAL_NO_LIMIT
;
292 lower
= limits
[i
* 2];
293 upper
= limits
[i
* 2 + 1];
295 ret
= thermal_zone_bind_cooling_device(tz
, i
, cdev
,
299 print_bind_err_msg(tz
, cdev
, ret
);
304 static void __unbind(struct thermal_zone_device
*tz
, int mask
,
305 struct thermal_cooling_device
*cdev
)
309 for (i
= 0; i
< tz
->trips
; i
++)
311 thermal_zone_unbind_cooling_device(tz
, i
, cdev
);
314 static void bind_cdev(struct thermal_cooling_device
*cdev
)
317 const struct thermal_zone_params
*tzp
;
318 struct thermal_zone_device
*pos
= NULL
;
320 mutex_lock(&thermal_list_lock
);
322 list_for_each_entry(pos
, &thermal_tz_list
, node
) {
323 if (!pos
->tzp
&& !pos
->ops
->bind
)
326 if (pos
->ops
->bind
) {
327 ret
= pos
->ops
->bind(pos
, cdev
);
329 print_bind_err_msg(pos
, cdev
, ret
);
334 if (!tzp
|| !tzp
->tbp
)
337 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
338 if (tzp
->tbp
[i
].cdev
|| !tzp
->tbp
[i
].match
)
340 if (tzp
->tbp
[i
].match(pos
, cdev
))
342 tzp
->tbp
[i
].cdev
= cdev
;
343 __bind(pos
, tzp
->tbp
[i
].trip_mask
, cdev
,
344 tzp
->tbp
[i
].binding_limits
,
349 mutex_unlock(&thermal_list_lock
);
352 static void bind_tz(struct thermal_zone_device
*tz
)
355 struct thermal_cooling_device
*pos
= NULL
;
356 const struct thermal_zone_params
*tzp
= tz
->tzp
;
358 if (!tzp
&& !tz
->ops
->bind
)
361 mutex_lock(&thermal_list_lock
);
363 /* If there is ops->bind, try to use ops->bind */
365 list_for_each_entry(pos
, &thermal_cdev_list
, node
) {
366 ret
= tz
->ops
->bind(tz
, pos
);
368 print_bind_err_msg(tz
, pos
, ret
);
373 if (!tzp
|| !tzp
->tbp
)
376 list_for_each_entry(pos
, &thermal_cdev_list
, node
) {
377 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
378 if (tzp
->tbp
[i
].cdev
|| !tzp
->tbp
[i
].match
)
380 if (tzp
->tbp
[i
].match(tz
, pos
))
382 tzp
->tbp
[i
].cdev
= pos
;
383 __bind(tz
, tzp
->tbp
[i
].trip_mask
, pos
,
384 tzp
->tbp
[i
].binding_limits
,
389 mutex_unlock(&thermal_list_lock
);
392 static void thermal_zone_device_set_polling(struct thermal_zone_device
*tz
,
396 mod_delayed_work(system_freezable_wq
, &tz
->poll_queue
,
397 round_jiffies(msecs_to_jiffies(delay
)));
399 mod_delayed_work(system_freezable_wq
, &tz
->poll_queue
,
400 msecs_to_jiffies(delay
));
402 cancel_delayed_work(&tz
->poll_queue
);
405 static void monitor_thermal_zone(struct thermal_zone_device
*tz
)
407 mutex_lock(&tz
->lock
);
410 thermal_zone_device_set_polling(tz
, tz
->passive_delay
);
411 else if (tz
->polling_delay
)
412 thermal_zone_device_set_polling(tz
, tz
->polling_delay
);
414 thermal_zone_device_set_polling(tz
, 0);
416 mutex_unlock(&tz
->lock
);
419 static void handle_non_critical_trips(struct thermal_zone_device
*tz
,
420 int trip
, enum thermal_trip_type trip_type
)
422 tz
->governor
? tz
->governor
->throttle(tz
, trip
) :
423 def_governor
->throttle(tz
, trip
);
426 static void handle_critical_trips(struct thermal_zone_device
*tz
,
427 int trip
, enum thermal_trip_type trip_type
)
431 tz
->ops
->get_trip_temp(tz
, trip
, &trip_temp
);
433 /* If we have not crossed the trip_temp, we do not care. */
434 if (trip_temp
<= 0 || tz
->temperature
< trip_temp
)
437 trace_thermal_zone_trip(tz
, trip
, trip_type
);
440 tz
->ops
->notify(tz
, trip
, trip_type
);
442 if (trip_type
== THERMAL_TRIP_CRITICAL
) {
443 dev_emerg(&tz
->device
,
444 "critical temperature reached(%d C),shutting down\n",
445 tz
->temperature
/ 1000);
446 orderly_poweroff(true);
450 static void handle_thermal_trip(struct thermal_zone_device
*tz
, int trip
)
452 enum thermal_trip_type type
;
454 tz
->ops
->get_trip_type(tz
, trip
, &type
);
456 if (type
== THERMAL_TRIP_CRITICAL
|| type
== THERMAL_TRIP_HOT
)
457 handle_critical_trips(tz
, trip
, type
);
459 handle_non_critical_trips(tz
, trip
, type
);
461 * Alright, we handled this trip successfully.
462 * So, start monitoring again.
464 monitor_thermal_zone(tz
);
468 * thermal_zone_get_temp() - returns the temperature of a thermal zone
469 * @tz: a valid pointer to a struct thermal_zone_device
470 * @temp: a valid pointer to where to store the resulting temperature.
472 * When a valid thermal zone reference is passed, it will fetch its
473 * temperature and fill @temp.
475 * Return: On success returns 0, an error code otherwise
477 int thermal_zone_get_temp(struct thermal_zone_device
*tz
, int *temp
)
481 int crit_temp
= INT_MAX
;
482 enum thermal_trip_type type
;
484 if (!tz
|| IS_ERR(tz
) || !tz
->ops
->get_temp
)
487 mutex_lock(&tz
->lock
);
489 ret
= tz
->ops
->get_temp(tz
, temp
);
491 if (IS_ENABLED(CONFIG_THERMAL_EMULATION
) && tz
->emul_temperature
) {
492 for (count
= 0; count
< tz
->trips
; count
++) {
493 ret
= tz
->ops
->get_trip_type(tz
, count
, &type
);
494 if (!ret
&& type
== THERMAL_TRIP_CRITICAL
) {
495 ret
= tz
->ops
->get_trip_temp(tz
, count
,
502 * Only allow emulating a temperature when the real temperature
503 * is below the critical temperature so that the emulation code
504 * cannot hide critical conditions.
506 if (!ret
&& *temp
< crit_temp
)
507 *temp
= tz
->emul_temperature
;
510 mutex_unlock(&tz
->lock
);
514 EXPORT_SYMBOL_GPL(thermal_zone_get_temp
);
516 static void update_temperature(struct thermal_zone_device
*tz
)
520 ret
= thermal_zone_get_temp(tz
, &temp
);
523 dev_warn(&tz
->device
,
524 "failed to read out thermal zone (%d)\n",
529 mutex_lock(&tz
->lock
);
530 tz
->last_temperature
= tz
->temperature
;
531 tz
->temperature
= temp
;
532 mutex_unlock(&tz
->lock
);
534 trace_thermal_temperature(tz
);
535 dev_dbg(&tz
->device
, "last_temperature=%d, current_temperature=%d\n",
536 tz
->last_temperature
, tz
->temperature
);
539 void thermal_zone_device_update(struct thermal_zone_device
*tz
)
543 if (!tz
->ops
->get_temp
)
546 update_temperature(tz
);
548 for (count
= 0; count
< tz
->trips
; count
++)
549 handle_thermal_trip(tz
, count
);
551 EXPORT_SYMBOL_GPL(thermal_zone_device_update
);
553 static void thermal_zone_device_check(struct work_struct
*work
)
555 struct thermal_zone_device
*tz
= container_of(work
, struct
558 thermal_zone_device_update(tz
);
561 /* sys I/F for thermal zone */
563 #define to_thermal_zone(_dev) \
564 container_of(_dev, struct thermal_zone_device, device)
567 type_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
569 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
571 return sprintf(buf
, "%s\n", tz
->type
);
575 temp_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
577 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
578 int temperature
, ret
;
580 ret
= thermal_zone_get_temp(tz
, &temperature
);
585 return sprintf(buf
, "%d\n", temperature
);
589 mode_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
591 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
592 enum thermal_device_mode mode
;
595 if (!tz
->ops
->get_mode
)
598 result
= tz
->ops
->get_mode(tz
, &mode
);
602 return sprintf(buf
, "%s\n", mode
== THERMAL_DEVICE_ENABLED
? "enabled"
607 mode_store(struct device
*dev
, struct device_attribute
*attr
,
608 const char *buf
, size_t count
)
610 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
613 if (!tz
->ops
->set_mode
)
616 if (!strncmp(buf
, "enabled", sizeof("enabled") - 1))
617 result
= tz
->ops
->set_mode(tz
, THERMAL_DEVICE_ENABLED
);
618 else if (!strncmp(buf
, "disabled", sizeof("disabled") - 1))
619 result
= tz
->ops
->set_mode(tz
, THERMAL_DEVICE_DISABLED
);
630 trip_point_type_show(struct device
*dev
, struct device_attribute
*attr
,
633 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
634 enum thermal_trip_type type
;
637 if (!tz
->ops
->get_trip_type
)
640 if (!sscanf(attr
->attr
.name
, "trip_point_%d_type", &trip
))
643 result
= tz
->ops
->get_trip_type(tz
, trip
, &type
);
648 case THERMAL_TRIP_CRITICAL
:
649 return sprintf(buf
, "critical\n");
650 case THERMAL_TRIP_HOT
:
651 return sprintf(buf
, "hot\n");
652 case THERMAL_TRIP_PASSIVE
:
653 return sprintf(buf
, "passive\n");
654 case THERMAL_TRIP_ACTIVE
:
655 return sprintf(buf
, "active\n");
657 return sprintf(buf
, "unknown\n");
662 trip_point_temp_store(struct device
*dev
, struct device_attribute
*attr
,
663 const char *buf
, size_t count
)
665 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
667 unsigned long temperature
;
669 if (!tz
->ops
->set_trip_temp
)
672 if (!sscanf(attr
->attr
.name
, "trip_point_%d_temp", &trip
))
675 if (kstrtoul(buf
, 10, &temperature
))
678 ret
= tz
->ops
->set_trip_temp(tz
, trip
, temperature
);
680 return ret
? ret
: count
;
684 trip_point_temp_show(struct device
*dev
, struct device_attribute
*attr
,
687 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
691 if (!tz
->ops
->get_trip_temp
)
694 if (!sscanf(attr
->attr
.name
, "trip_point_%d_temp", &trip
))
697 ret
= tz
->ops
->get_trip_temp(tz
, trip
, &temperature
);
702 return sprintf(buf
, "%d\n", temperature
);
706 trip_point_hyst_store(struct device
*dev
, struct device_attribute
*attr
,
707 const char *buf
, size_t count
)
709 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
713 if (!tz
->ops
->set_trip_hyst
)
716 if (!sscanf(attr
->attr
.name
, "trip_point_%d_hyst", &trip
))
719 if (kstrtoint(buf
, 10, &temperature
))
723 * We are not doing any check on the 'temperature' value
724 * here. The driver implementing 'set_trip_hyst' has to
727 ret
= tz
->ops
->set_trip_hyst(tz
, trip
, temperature
);
729 return ret
? ret
: count
;
733 trip_point_hyst_show(struct device
*dev
, struct device_attribute
*attr
,
736 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
740 if (!tz
->ops
->get_trip_hyst
)
743 if (!sscanf(attr
->attr
.name
, "trip_point_%d_hyst", &trip
))
746 ret
= tz
->ops
->get_trip_hyst(tz
, trip
, &temperature
);
748 return ret
? ret
: sprintf(buf
, "%d\n", temperature
);
752 passive_store(struct device
*dev
, struct device_attribute
*attr
,
753 const char *buf
, size_t count
)
755 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
756 struct thermal_cooling_device
*cdev
= NULL
;
759 if (!sscanf(buf
, "%d\n", &state
))
762 /* sanity check: values below 1000 millicelcius don't make sense
763 * and can cause the system to go into a thermal heart attack
765 if (state
&& state
< 1000)
768 if (state
&& !tz
->forced_passive
) {
769 mutex_lock(&thermal_list_lock
);
770 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
771 if (!strncmp("Processor", cdev
->type
,
772 sizeof("Processor")))
773 thermal_zone_bind_cooling_device(tz
,
774 THERMAL_TRIPS_NONE
, cdev
,
777 THERMAL_WEIGHT_DEFAULT
);
779 mutex_unlock(&thermal_list_lock
);
780 if (!tz
->passive_delay
)
781 tz
->passive_delay
= 1000;
782 } else if (!state
&& tz
->forced_passive
) {
783 mutex_lock(&thermal_list_lock
);
784 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
785 if (!strncmp("Processor", cdev
->type
,
786 sizeof("Processor")))
787 thermal_zone_unbind_cooling_device(tz
,
791 mutex_unlock(&thermal_list_lock
);
792 tz
->passive_delay
= 0;
795 tz
->forced_passive
= state
;
797 thermal_zone_device_update(tz
);
803 passive_show(struct device
*dev
, struct device_attribute
*attr
,
806 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
808 return sprintf(buf
, "%d\n", tz
->forced_passive
);
812 policy_store(struct device
*dev
, struct device_attribute
*attr
,
813 const char *buf
, size_t count
)
816 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
817 struct thermal_governor
*gov
;
818 char name
[THERMAL_NAME_LENGTH
];
820 snprintf(name
, sizeof(name
), "%s", buf
);
822 mutex_lock(&thermal_governor_lock
);
823 mutex_lock(&tz
->lock
);
825 gov
= __find_governor(strim(name
));
829 ret
= thermal_set_governor(tz
, gov
);
834 mutex_unlock(&tz
->lock
);
835 mutex_unlock(&thermal_governor_lock
);
840 policy_show(struct device
*dev
, struct device_attribute
*devattr
, char *buf
)
842 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
844 return sprintf(buf
, "%s\n", tz
->governor
->name
);
848 available_policies_show(struct device
*dev
, struct device_attribute
*devattr
,
851 struct thermal_governor
*pos
;
853 ssize_t size
= PAGE_SIZE
;
855 mutex_lock(&thermal_governor_lock
);
857 list_for_each_entry(pos
, &thermal_governor_list
, governor_list
) {
858 size
= PAGE_SIZE
- count
;
859 count
+= scnprintf(buf
+ count
, size
, "%s ", pos
->name
);
861 count
+= scnprintf(buf
+ count
, size
, "\n");
863 mutex_unlock(&thermal_governor_lock
);
869 emul_temp_store(struct device
*dev
, struct device_attribute
*attr
,
870 const char *buf
, size_t count
)
872 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
874 unsigned long temperature
;
876 if (kstrtoul(buf
, 10, &temperature
))
879 if (!tz
->ops
->set_emul_temp
) {
880 mutex_lock(&tz
->lock
);
881 tz
->emul_temperature
= temperature
;
882 mutex_unlock(&tz
->lock
);
884 ret
= tz
->ops
->set_emul_temp(tz
, temperature
);
888 thermal_zone_device_update(tz
);
890 return ret
? ret
: count
;
892 static DEVICE_ATTR(emul_temp
, S_IWUSR
, NULL
, emul_temp_store
);
895 sustainable_power_show(struct device
*dev
, struct device_attribute
*devattr
,
898 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
901 return sprintf(buf
, "%u\n", tz
->tzp
->sustainable_power
);
907 sustainable_power_store(struct device
*dev
, struct device_attribute
*devattr
,
908 const char *buf
, size_t count
)
910 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
911 u32 sustainable_power
;
916 if (kstrtou32(buf
, 10, &sustainable_power
))
919 tz
->tzp
->sustainable_power
= sustainable_power
;
923 static DEVICE_ATTR(sustainable_power
, S_IWUSR
| S_IRUGO
, sustainable_power_show
,
924 sustainable_power_store
);
926 #define create_s32_tzp_attr(name) \
928 name##_show(struct device *dev, struct device_attribute *devattr, \
931 struct thermal_zone_device *tz = to_thermal_zone(dev); \
934 return sprintf(buf, "%u\n", tz->tzp->name); \
940 name##_store(struct device *dev, struct device_attribute *devattr, \
941 const char *buf, size_t count) \
943 struct thermal_zone_device *tz = to_thermal_zone(dev); \
949 if (kstrtos32(buf, 10, &value)) \
952 tz->tzp->name = value; \
956 static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
958 create_s32_tzp_attr(k_po
);
959 create_s32_tzp_attr(k_pu
);
960 create_s32_tzp_attr(k_i
);
961 create_s32_tzp_attr(k_d
);
962 create_s32_tzp_attr(integral_cutoff
);
963 create_s32_tzp_attr(slope
);
964 create_s32_tzp_attr(offset
);
965 #undef create_s32_tzp_attr
967 static struct device_attribute
*dev_tzp_attrs
[] = {
968 &dev_attr_sustainable_power
,
973 &dev_attr_integral_cutoff
,
978 static int create_tzp_attrs(struct device
*dev
)
982 for (i
= 0; i
< ARRAY_SIZE(dev_tzp_attrs
); i
++) {
984 struct device_attribute
*dev_attr
= dev_tzp_attrs
[i
];
986 ret
= device_create_file(dev
, dev_attr
);
995 * power_actor_get_max_power() - get the maximum power that a cdev can consume
996 * @cdev: pointer to &thermal_cooling_device
997 * @tz: a valid thermal zone device pointer
998 * @max_power: pointer in which to store the maximum power
1000 * Calculate the maximum power consumption in milliwats that the
1001 * cooling device can currently consume and store it in @max_power.
1003 * Return: 0 on success, -EINVAL if @cdev doesn't support the
1004 * power_actor API or -E* on other error.
1006 int power_actor_get_max_power(struct thermal_cooling_device
*cdev
,
1007 struct thermal_zone_device
*tz
, u32
*max_power
)
1009 if (!cdev_is_power_actor(cdev
))
1012 return cdev
->ops
->state2power(cdev
, tz
, 0, max_power
);
1016 * power_actor_set_power() - limit the maximum power that a cooling device can consume
1017 * @cdev: pointer to &thermal_cooling_device
1018 * @instance: thermal instance to update
1019 * @power: the power in milliwatts
1021 * Set the cooling device to consume at most @power milliwatts.
1023 * Return: 0 on success, -EINVAL if the cooling device does not
1024 * implement the power actor API or -E* for other failures.
1026 int power_actor_set_power(struct thermal_cooling_device
*cdev
,
1027 struct thermal_instance
*instance
, u32 power
)
1029 unsigned long state
;
1032 if (!cdev_is_power_actor(cdev
))
1035 ret
= cdev
->ops
->power2state(cdev
, instance
->tz
, power
, &state
);
1039 instance
->target
= state
;
1040 cdev
->updated
= false;
1041 thermal_cdev_update(cdev
);
1046 static DEVICE_ATTR(type
, 0444, type_show
, NULL
);
1047 static DEVICE_ATTR(temp
, 0444, temp_show
, NULL
);
1048 static DEVICE_ATTR(mode
, 0644, mode_show
, mode_store
);
1049 static DEVICE_ATTR(passive
, S_IRUGO
| S_IWUSR
, passive_show
, passive_store
);
1050 static DEVICE_ATTR(policy
, S_IRUGO
| S_IWUSR
, policy_show
, policy_store
);
1051 static DEVICE_ATTR(available_policies
, S_IRUGO
, available_policies_show
, NULL
);
1053 /* sys I/F for cooling device */
1054 #define to_cooling_device(_dev) \
1055 container_of(_dev, struct thermal_cooling_device, device)
1058 thermal_cooling_device_type_show(struct device
*dev
,
1059 struct device_attribute
*attr
, char *buf
)
1061 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
1063 return sprintf(buf
, "%s\n", cdev
->type
);
1067 thermal_cooling_device_max_state_show(struct device
*dev
,
1068 struct device_attribute
*attr
, char *buf
)
1070 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
1071 unsigned long state
;
1074 ret
= cdev
->ops
->get_max_state(cdev
, &state
);
1077 return sprintf(buf
, "%ld\n", state
);
1081 thermal_cooling_device_cur_state_show(struct device
*dev
,
1082 struct device_attribute
*attr
, char *buf
)
1084 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
1085 unsigned long state
;
1088 ret
= cdev
->ops
->get_cur_state(cdev
, &state
);
1091 return sprintf(buf
, "%ld\n", state
);
1095 thermal_cooling_device_cur_state_store(struct device
*dev
,
1096 struct device_attribute
*attr
,
1097 const char *buf
, size_t count
)
1099 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
1100 unsigned long state
;
1103 if (!sscanf(buf
, "%ld\n", &state
))
1106 if ((long)state
< 0)
1109 result
= cdev
->ops
->set_cur_state(cdev
, state
);
1115 static struct device_attribute dev_attr_cdev_type
=
1116 __ATTR(type
, 0444, thermal_cooling_device_type_show
, NULL
);
1117 static DEVICE_ATTR(max_state
, 0444,
1118 thermal_cooling_device_max_state_show
, NULL
);
1119 static DEVICE_ATTR(cur_state
, 0644,
1120 thermal_cooling_device_cur_state_show
,
1121 thermal_cooling_device_cur_state_store
);
1124 thermal_cooling_device_trip_point_show(struct device
*dev
,
1125 struct device_attribute
*attr
, char *buf
)
1127 struct thermal_instance
*instance
;
1130 container_of(attr
, struct thermal_instance
, attr
);
1132 if (instance
->trip
== THERMAL_TRIPS_NONE
)
1133 return sprintf(buf
, "-1\n");
1135 return sprintf(buf
, "%d\n", instance
->trip
);
1138 static struct attribute
*cooling_device_attrs
[] = {
1139 &dev_attr_cdev_type
.attr
,
1140 &dev_attr_max_state
.attr
,
1141 &dev_attr_cur_state
.attr
,
1145 static const struct attribute_group cooling_device_attr_group
= {
1146 .attrs
= cooling_device_attrs
,
1149 static const struct attribute_group
*cooling_device_attr_groups
[] = {
1150 &cooling_device_attr_group
,
1155 thermal_cooling_device_weight_show(struct device
*dev
,
1156 struct device_attribute
*attr
, char *buf
)
1158 struct thermal_instance
*instance
;
1160 instance
= container_of(attr
, struct thermal_instance
, weight_attr
);
1162 return sprintf(buf
, "%d\n", instance
->weight
);
1166 thermal_cooling_device_weight_store(struct device
*dev
,
1167 struct device_attribute
*attr
,
1168 const char *buf
, size_t count
)
1170 struct thermal_instance
*instance
;
1173 ret
= kstrtoint(buf
, 0, &weight
);
1177 instance
= container_of(attr
, struct thermal_instance
, weight_attr
);
1178 instance
->weight
= weight
;
1182 /* Device management */
1185 * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
1186 * @tz: pointer to struct thermal_zone_device
1187 * @trip: indicates which trip point the cooling devices is
1188 * associated with in this thermal zone.
1189 * @cdev: pointer to struct thermal_cooling_device
1190 * @upper: the Maximum cooling state for this trip point.
1191 * THERMAL_NO_LIMIT means no upper limit,
1192 * and the cooling device can be in max_state.
1193 * @lower: the Minimum cooling state can be used for this trip point.
1194 * THERMAL_NO_LIMIT means no lower limit,
1195 * and the cooling device can be in cooling state 0.
1196 * @weight: The weight of the cooling device to be bound to the
1197 * thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
1200 * This interface function bind a thermal cooling device to the certain trip
1201 * point of a thermal zone device.
1202 * This function is usually called in the thermal zone device .bind callback.
1204 * Return: 0 on success, the proper error value otherwise.
1206 int thermal_zone_bind_cooling_device(struct thermal_zone_device
*tz
,
1208 struct thermal_cooling_device
*cdev
,
1209 unsigned long upper
, unsigned long lower
,
1210 unsigned int weight
)
1212 struct thermal_instance
*dev
;
1213 struct thermal_instance
*pos
;
1214 struct thermal_zone_device
*pos1
;
1215 struct thermal_cooling_device
*pos2
;
1216 unsigned long max_state
;
1219 if (trip
>= tz
->trips
|| (trip
< 0 && trip
!= THERMAL_TRIPS_NONE
))
1222 list_for_each_entry(pos1
, &thermal_tz_list
, node
) {
1226 list_for_each_entry(pos2
, &thermal_cdev_list
, node
) {
1231 if (tz
!= pos1
|| cdev
!= pos2
)
1234 ret
= cdev
->ops
->get_max_state(cdev
, &max_state
);
1238 /* lower default 0, upper default max_state */
1239 lower
= lower
== THERMAL_NO_LIMIT
? 0 : lower
;
1240 upper
= upper
== THERMAL_NO_LIMIT
? max_state
: upper
;
1242 if (lower
> upper
|| upper
> max_state
)
1246 kzalloc(sizeof(struct thermal_instance
), GFP_KERNEL
);
1254 dev
->target
= THERMAL_NO_TARGET
;
1255 dev
->weight
= weight
;
1257 result
= get_idr(&tz
->idr
, &tz
->lock
, &dev
->id
);
1261 sprintf(dev
->name
, "cdev%d", dev
->id
);
1263 sysfs_create_link(&tz
->device
.kobj
, &cdev
->device
.kobj
, dev
->name
);
1267 sprintf(dev
->attr_name
, "cdev%d_trip_point", dev
->id
);
1268 sysfs_attr_init(&dev
->attr
.attr
);
1269 dev
->attr
.attr
.name
= dev
->attr_name
;
1270 dev
->attr
.attr
.mode
= 0444;
1271 dev
->attr
.show
= thermal_cooling_device_trip_point_show
;
1272 result
= device_create_file(&tz
->device
, &dev
->attr
);
1274 goto remove_symbol_link
;
1276 sprintf(dev
->weight_attr_name
, "cdev%d_weight", dev
->id
);
1277 sysfs_attr_init(&dev
->weight_attr
.attr
);
1278 dev
->weight_attr
.attr
.name
= dev
->weight_attr_name
;
1279 dev
->weight_attr
.attr
.mode
= S_IWUSR
| S_IRUGO
;
1280 dev
->weight_attr
.show
= thermal_cooling_device_weight_show
;
1281 dev
->weight_attr
.store
= thermal_cooling_device_weight_store
;
1282 result
= device_create_file(&tz
->device
, &dev
->weight_attr
);
1284 goto remove_trip_file
;
1286 mutex_lock(&tz
->lock
);
1287 mutex_lock(&cdev
->lock
);
1288 list_for_each_entry(pos
, &tz
->thermal_instances
, tz_node
)
1289 if (pos
->tz
== tz
&& pos
->trip
== trip
&& pos
->cdev
== cdev
) {
1294 list_add_tail(&dev
->tz_node
, &tz
->thermal_instances
);
1295 list_add_tail(&dev
->cdev_node
, &cdev
->thermal_instances
);
1297 mutex_unlock(&cdev
->lock
);
1298 mutex_unlock(&tz
->lock
);
1303 device_remove_file(&tz
->device
, &dev
->weight_attr
);
1305 device_remove_file(&tz
->device
, &dev
->attr
);
1307 sysfs_remove_link(&tz
->device
.kobj
, dev
->name
);
1309 release_idr(&tz
->idr
, &tz
->lock
, dev
->id
);
1314 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device
);
1317 * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1319 * @tz: pointer to a struct thermal_zone_device.
1320 * @trip: indicates which trip point the cooling devices is
1321 * associated with in this thermal zone.
1322 * @cdev: pointer to a struct thermal_cooling_device.
1324 * This interface function unbind a thermal cooling device from the certain
1325 * trip point of a thermal zone device.
1326 * This function is usually called in the thermal zone device .unbind callback.
1328 * Return: 0 on success, the proper error value otherwise.
1330 int thermal_zone_unbind_cooling_device(struct thermal_zone_device
*tz
,
1332 struct thermal_cooling_device
*cdev
)
1334 struct thermal_instance
*pos
, *next
;
1336 mutex_lock(&tz
->lock
);
1337 mutex_lock(&cdev
->lock
);
1338 list_for_each_entry_safe(pos
, next
, &tz
->thermal_instances
, tz_node
) {
1339 if (pos
->tz
== tz
&& pos
->trip
== trip
&& pos
->cdev
== cdev
) {
1340 list_del(&pos
->tz_node
);
1341 list_del(&pos
->cdev_node
);
1342 mutex_unlock(&cdev
->lock
);
1343 mutex_unlock(&tz
->lock
);
1347 mutex_unlock(&cdev
->lock
);
1348 mutex_unlock(&tz
->lock
);
1353 device_remove_file(&tz
->device
, &pos
->weight_attr
);
1354 device_remove_file(&tz
->device
, &pos
->attr
);
1355 sysfs_remove_link(&tz
->device
.kobj
, pos
->name
);
1356 release_idr(&tz
->idr
, &tz
->lock
, pos
->id
);
1360 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device
);
1362 static void thermal_release(struct device
*dev
)
1364 struct thermal_zone_device
*tz
;
1365 struct thermal_cooling_device
*cdev
;
1367 if (!strncmp(dev_name(dev
), "thermal_zone",
1368 sizeof("thermal_zone") - 1)) {
1369 tz
= to_thermal_zone(dev
);
1371 } else if(!strncmp(dev_name(dev
), "cooling_device",
1372 sizeof("cooling_device") - 1)){
1373 cdev
= to_cooling_device(dev
);
1378 static struct class thermal_class
= {
1380 .dev_release
= thermal_release
,
1384 * __thermal_cooling_device_register() - register a new thermal cooling device
1385 * @np: a pointer to a device tree node.
1386 * @type: the thermal cooling device type.
1387 * @devdata: device private data.
1388 * @ops: standard thermal cooling devices callbacks.
1390 * This interface function adds a new thermal cooling device (fan/processor/...)
1391 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1392 * to all the thermal zone devices registered at the same time.
1393 * It also gives the opportunity to link the cooling device to a device tree
1394 * node, so that it can be bound to a thermal zone created out of device tree.
1396 * Return: a pointer to the created struct thermal_cooling_device or an
1397 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1399 static struct thermal_cooling_device
*
1400 __thermal_cooling_device_register(struct device_node
*np
,
1401 char *type
, void *devdata
,
1402 const struct thermal_cooling_device_ops
*ops
)
1404 struct thermal_cooling_device
*cdev
;
1407 if (type
&& strlen(type
) >= THERMAL_NAME_LENGTH
)
1408 return ERR_PTR(-EINVAL
);
1410 if (!ops
|| !ops
->get_max_state
|| !ops
->get_cur_state
||
1411 !ops
->set_cur_state
)
1412 return ERR_PTR(-EINVAL
);
1414 cdev
= kzalloc(sizeof(struct thermal_cooling_device
), GFP_KERNEL
);
1416 return ERR_PTR(-ENOMEM
);
1418 result
= get_idr(&thermal_cdev_idr
, &thermal_idr_lock
, &cdev
->id
);
1421 return ERR_PTR(result
);
1424 strlcpy(cdev
->type
, type
? : "", sizeof(cdev
->type
));
1425 mutex_init(&cdev
->lock
);
1426 INIT_LIST_HEAD(&cdev
->thermal_instances
);
1429 cdev
->updated
= false;
1430 cdev
->device
.class = &thermal_class
;
1431 cdev
->device
.groups
= cooling_device_attr_groups
;
1432 cdev
->devdata
= devdata
;
1433 dev_set_name(&cdev
->device
, "cooling_device%d", cdev
->id
);
1434 result
= device_register(&cdev
->device
);
1436 release_idr(&thermal_cdev_idr
, &thermal_idr_lock
, cdev
->id
);
1438 return ERR_PTR(result
);
1441 /* Add 'this' new cdev to the global cdev list */
1442 mutex_lock(&thermal_list_lock
);
1443 list_add(&cdev
->node
, &thermal_cdev_list
);
1444 mutex_unlock(&thermal_list_lock
);
1446 /* Update binding information for 'this' new cdev */
1453 * thermal_cooling_device_register() - register a new thermal cooling device
1454 * @type: the thermal cooling device type.
1455 * @devdata: device private data.
1456 * @ops: standard thermal cooling devices callbacks.
1458 * This interface function adds a new thermal cooling device (fan/processor/...)
1459 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1460 * to all the thermal zone devices registered at the same time.
1462 * Return: a pointer to the created struct thermal_cooling_device or an
1463 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1465 struct thermal_cooling_device
*
1466 thermal_cooling_device_register(char *type
, void *devdata
,
1467 const struct thermal_cooling_device_ops
*ops
)
1469 return __thermal_cooling_device_register(NULL
, type
, devdata
, ops
);
1471 EXPORT_SYMBOL_GPL(thermal_cooling_device_register
);
1474 * thermal_of_cooling_device_register() - register an OF thermal cooling device
1475 * @np: a pointer to a device tree node.
1476 * @type: the thermal cooling device type.
1477 * @devdata: device private data.
1478 * @ops: standard thermal cooling devices callbacks.
1480 * This function will register a cooling device with device tree node reference.
1481 * This interface function adds a new thermal cooling device (fan/processor/...)
1482 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1483 * to all the thermal zone devices registered at the same time.
1485 * Return: a pointer to the created struct thermal_cooling_device or an
1486 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1488 struct thermal_cooling_device
*
1489 thermal_of_cooling_device_register(struct device_node
*np
,
1490 char *type
, void *devdata
,
1491 const struct thermal_cooling_device_ops
*ops
)
1493 return __thermal_cooling_device_register(np
, type
, devdata
, ops
);
1495 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register
);
1498 * thermal_cooling_device_unregister - removes the registered thermal cooling device
1499 * @cdev: the thermal cooling device to remove.
1501 * thermal_cooling_device_unregister() must be called when the device is no
1504 void thermal_cooling_device_unregister(struct thermal_cooling_device
*cdev
)
1507 const struct thermal_zone_params
*tzp
;
1508 struct thermal_zone_device
*tz
;
1509 struct thermal_cooling_device
*pos
= NULL
;
1514 mutex_lock(&thermal_list_lock
);
1515 list_for_each_entry(pos
, &thermal_cdev_list
, node
)
1519 /* thermal cooling device not found */
1520 mutex_unlock(&thermal_list_lock
);
1523 list_del(&cdev
->node
);
1525 /* Unbind all thermal zones associated with 'this' cdev */
1526 list_for_each_entry(tz
, &thermal_tz_list
, node
) {
1527 if (tz
->ops
->unbind
) {
1528 tz
->ops
->unbind(tz
, cdev
);
1532 if (!tz
->tzp
|| !tz
->tzp
->tbp
)
1536 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
1537 if (tzp
->tbp
[i
].cdev
== cdev
) {
1538 __unbind(tz
, tzp
->tbp
[i
].trip_mask
, cdev
);
1539 tzp
->tbp
[i
].cdev
= NULL
;
1544 mutex_unlock(&thermal_list_lock
);
1547 device_remove_file(&cdev
->device
, &dev_attr_cdev_type
);
1548 device_remove_file(&cdev
->device
, &dev_attr_max_state
);
1549 device_remove_file(&cdev
->device
, &dev_attr_cur_state
);
1551 release_idr(&thermal_cdev_idr
, &thermal_idr_lock
, cdev
->id
);
1552 device_unregister(&cdev
->device
);
1555 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister
);
1557 void thermal_cdev_update(struct thermal_cooling_device
*cdev
)
1559 struct thermal_instance
*instance
;
1560 unsigned long target
= 0;
1562 /* cooling device is updated*/
1566 mutex_lock(&cdev
->lock
);
1567 /* Make sure cdev enters the deepest cooling state */
1568 list_for_each_entry(instance
, &cdev
->thermal_instances
, cdev_node
) {
1569 dev_dbg(&cdev
->device
, "zone%d->target=%lu\n",
1570 instance
->tz
->id
, instance
->target
);
1571 if (instance
->target
== THERMAL_NO_TARGET
)
1573 if (instance
->target
> target
)
1574 target
= instance
->target
;
1576 mutex_unlock(&cdev
->lock
);
1577 cdev
->ops
->set_cur_state(cdev
, target
);
1578 cdev
->updated
= true;
1579 trace_cdev_update(cdev
, target
);
1580 dev_dbg(&cdev
->device
, "set to state %lu\n", target
);
1582 EXPORT_SYMBOL(thermal_cdev_update
);
1585 * thermal_notify_framework - Sensor drivers use this API to notify framework
1586 * @tz: thermal zone device
1587 * @trip: indicates which trip point has been crossed
1589 * This function handles the trip events from sensor drivers. It starts
1590 * throttling the cooling devices according to the policy configured.
1591 * For CRITICAL and HOT trip points, this notifies the respective drivers,
1592 * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1593 * The throttling policy is based on the configured platform data; if no
1594 * platform data is provided, this uses the step_wise throttling policy.
1596 void thermal_notify_framework(struct thermal_zone_device
*tz
, int trip
)
1598 handle_thermal_trip(tz
, trip
);
1600 EXPORT_SYMBOL_GPL(thermal_notify_framework
);
1603 * create_trip_attrs() - create attributes for trip points
1604 * @tz: the thermal zone device
1605 * @mask: Writeable trip point bitmap.
1607 * helper function to instantiate sysfs entries for every trip
1608 * point and its properties of a struct thermal_zone_device.
1610 * Return: 0 on success, the proper error value otherwise.
1612 static int create_trip_attrs(struct thermal_zone_device
*tz
, int mask
)
1615 int size
= sizeof(struct thermal_attr
) * tz
->trips
;
1617 tz
->trip_type_attrs
= kzalloc(size
, GFP_KERNEL
);
1618 if (!tz
->trip_type_attrs
)
1621 tz
->trip_temp_attrs
= kzalloc(size
, GFP_KERNEL
);
1622 if (!tz
->trip_temp_attrs
) {
1623 kfree(tz
->trip_type_attrs
);
1627 if (tz
->ops
->get_trip_hyst
) {
1628 tz
->trip_hyst_attrs
= kzalloc(size
, GFP_KERNEL
);
1629 if (!tz
->trip_hyst_attrs
) {
1630 kfree(tz
->trip_type_attrs
);
1631 kfree(tz
->trip_temp_attrs
);
1637 for (indx
= 0; indx
< tz
->trips
; indx
++) {
1638 /* create trip type attribute */
1639 snprintf(tz
->trip_type_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1640 "trip_point_%d_type", indx
);
1642 sysfs_attr_init(&tz
->trip_type_attrs
[indx
].attr
.attr
);
1643 tz
->trip_type_attrs
[indx
].attr
.attr
.name
=
1644 tz
->trip_type_attrs
[indx
].name
;
1645 tz
->trip_type_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1646 tz
->trip_type_attrs
[indx
].attr
.show
= trip_point_type_show
;
1648 device_create_file(&tz
->device
,
1649 &tz
->trip_type_attrs
[indx
].attr
);
1651 /* create trip temp attribute */
1652 snprintf(tz
->trip_temp_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1653 "trip_point_%d_temp", indx
);
1655 sysfs_attr_init(&tz
->trip_temp_attrs
[indx
].attr
.attr
);
1656 tz
->trip_temp_attrs
[indx
].attr
.attr
.name
=
1657 tz
->trip_temp_attrs
[indx
].name
;
1658 tz
->trip_temp_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1659 tz
->trip_temp_attrs
[indx
].attr
.show
= trip_point_temp_show
;
1660 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS
) &&
1661 mask
& (1 << indx
)) {
1662 tz
->trip_temp_attrs
[indx
].attr
.attr
.mode
|= S_IWUSR
;
1663 tz
->trip_temp_attrs
[indx
].attr
.store
=
1664 trip_point_temp_store
;
1667 device_create_file(&tz
->device
,
1668 &tz
->trip_temp_attrs
[indx
].attr
);
1670 /* create Optional trip hyst attribute */
1671 if (!tz
->ops
->get_trip_hyst
)
1673 snprintf(tz
->trip_hyst_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1674 "trip_point_%d_hyst", indx
);
1676 sysfs_attr_init(&tz
->trip_hyst_attrs
[indx
].attr
.attr
);
1677 tz
->trip_hyst_attrs
[indx
].attr
.attr
.name
=
1678 tz
->trip_hyst_attrs
[indx
].name
;
1679 tz
->trip_hyst_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1680 tz
->trip_hyst_attrs
[indx
].attr
.show
= trip_point_hyst_show
;
1681 if (tz
->ops
->set_trip_hyst
) {
1682 tz
->trip_hyst_attrs
[indx
].attr
.attr
.mode
|= S_IWUSR
;
1683 tz
->trip_hyst_attrs
[indx
].attr
.store
=
1684 trip_point_hyst_store
;
1687 device_create_file(&tz
->device
,
1688 &tz
->trip_hyst_attrs
[indx
].attr
);
1693 static void remove_trip_attrs(struct thermal_zone_device
*tz
)
1697 for (indx
= 0; indx
< tz
->trips
; indx
++) {
1698 device_remove_file(&tz
->device
,
1699 &tz
->trip_type_attrs
[indx
].attr
);
1700 device_remove_file(&tz
->device
,
1701 &tz
->trip_temp_attrs
[indx
].attr
);
1702 if (tz
->ops
->get_trip_hyst
)
1703 device_remove_file(&tz
->device
,
1704 &tz
->trip_hyst_attrs
[indx
].attr
);
1706 kfree(tz
->trip_type_attrs
);
1707 kfree(tz
->trip_temp_attrs
);
1708 kfree(tz
->trip_hyst_attrs
);
1712 * thermal_zone_device_register() - register a new thermal zone device
1713 * @type: the thermal zone device type
1714 * @trips: the number of trip points the thermal zone support
1715 * @mask: a bit string indicating the writeablility of trip points
1716 * @devdata: private device data
1717 * @ops: standard thermal zone device callbacks
1718 * @tzp: thermal zone platform parameters
1719 * @passive_delay: number of milliseconds to wait between polls when
1720 * performing passive cooling
1721 * @polling_delay: number of milliseconds to wait between polls when checking
1722 * whether trip points have been crossed (0 for interrupt
1725 * This interface function adds a new thermal zone device (sensor) to
1726 * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1727 * thermal cooling devices registered at the same time.
1728 * thermal_zone_device_unregister() must be called when the device is no
1729 * longer needed. The passive cooling depends on the .get_trend() return value.
1731 * Return: a pointer to the created struct thermal_zone_device or an
1732 * in case of error, an ERR_PTR. Caller must check return value with
1733 * IS_ERR*() helpers.
1735 struct thermal_zone_device
*thermal_zone_device_register(const char *type
,
1736 int trips
, int mask
, void *devdata
,
1737 struct thermal_zone_device_ops
*ops
,
1738 struct thermal_zone_params
*tzp
,
1739 int passive_delay
, int polling_delay
)
1741 struct thermal_zone_device
*tz
;
1742 enum thermal_trip_type trip_type
;
1746 struct thermal_governor
*governor
;
1748 if (type
&& strlen(type
) >= THERMAL_NAME_LENGTH
)
1749 return ERR_PTR(-EINVAL
);
1751 if (trips
> THERMAL_MAX_TRIPS
|| trips
< 0 || mask
>> trips
)
1752 return ERR_PTR(-EINVAL
);
1755 return ERR_PTR(-EINVAL
);
1757 if (trips
> 0 && (!ops
->get_trip_type
|| !ops
->get_trip_temp
))
1758 return ERR_PTR(-EINVAL
);
1760 tz
= kzalloc(sizeof(struct thermal_zone_device
), GFP_KERNEL
);
1762 return ERR_PTR(-ENOMEM
);
1764 INIT_LIST_HEAD(&tz
->thermal_instances
);
1766 mutex_init(&tz
->lock
);
1767 result
= get_idr(&thermal_tz_idr
, &thermal_idr_lock
, &tz
->id
);
1770 return ERR_PTR(result
);
1773 strlcpy(tz
->type
, type
? : "", sizeof(tz
->type
));
1776 tz
->device
.class = &thermal_class
;
1777 tz
->devdata
= devdata
;
1779 tz
->passive_delay
= passive_delay
;
1780 tz
->polling_delay
= polling_delay
;
1782 dev_set_name(&tz
->device
, "thermal_zone%d", tz
->id
);
1783 result
= device_register(&tz
->device
);
1785 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
1787 return ERR_PTR(result
);
1792 result
= device_create_file(&tz
->device
, &dev_attr_type
);
1797 result
= device_create_file(&tz
->device
, &dev_attr_temp
);
1801 if (ops
->get_mode
) {
1802 result
= device_create_file(&tz
->device
, &dev_attr_mode
);
1807 result
= create_trip_attrs(tz
, mask
);
1811 for (count
= 0; count
< trips
; count
++) {
1812 tz
->ops
->get_trip_type(tz
, count
, &trip_type
);
1813 if (trip_type
== THERMAL_TRIP_PASSIVE
)
1818 result
= device_create_file(&tz
->device
, &dev_attr_passive
);
1823 if (IS_ENABLED(CONFIG_THERMAL_EMULATION
)) {
1824 result
= device_create_file(&tz
->device
, &dev_attr_emul_temp
);
1829 /* Create policy attribute */
1830 result
= device_create_file(&tz
->device
, &dev_attr_policy
);
1834 /* Add thermal zone params */
1835 result
= create_tzp_attrs(&tz
->device
);
1839 /* Create available_policies attribute */
1840 result
= device_create_file(&tz
->device
, &dev_attr_available_policies
);
1844 /* Update 'this' zone's governor information */
1845 mutex_lock(&thermal_governor_lock
);
1848 governor
= __find_governor(tz
->tzp
->governor_name
);
1850 governor
= def_governor
;
1852 result
= thermal_set_governor(tz
, governor
);
1854 mutex_unlock(&thermal_governor_lock
);
1858 mutex_unlock(&thermal_governor_lock
);
1860 if (!tz
->tzp
|| !tz
->tzp
->no_hwmon
) {
1861 result
= thermal_add_hwmon_sysfs(tz
);
1866 mutex_lock(&thermal_list_lock
);
1867 list_add_tail(&tz
->node
, &thermal_tz_list
);
1868 mutex_unlock(&thermal_list_lock
);
1870 /* Bind cooling devices for this zone */
1873 INIT_DELAYED_WORK(&(tz
->poll_queue
), thermal_zone_device_check
);
1875 thermal_zone_device_update(tz
);
1880 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
1881 device_unregister(&tz
->device
);
1882 return ERR_PTR(result
);
1884 EXPORT_SYMBOL_GPL(thermal_zone_device_register
);
1887 * thermal_device_unregister - removes the registered thermal zone device
1888 * @tz: the thermal zone device to remove
1890 void thermal_zone_device_unregister(struct thermal_zone_device
*tz
)
1893 const struct thermal_zone_params
*tzp
;
1894 struct thermal_cooling_device
*cdev
;
1895 struct thermal_zone_device
*pos
= NULL
;
1902 mutex_lock(&thermal_list_lock
);
1903 list_for_each_entry(pos
, &thermal_tz_list
, node
)
1907 /* thermal zone device not found */
1908 mutex_unlock(&thermal_list_lock
);
1911 list_del(&tz
->node
);
1913 /* Unbind all cdevs associated with 'this' thermal zone */
1914 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
1915 if (tz
->ops
->unbind
) {
1916 tz
->ops
->unbind(tz
, cdev
);
1920 if (!tzp
|| !tzp
->tbp
)
1923 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
1924 if (tzp
->tbp
[i
].cdev
== cdev
) {
1925 __unbind(tz
, tzp
->tbp
[i
].trip_mask
, cdev
);
1926 tzp
->tbp
[i
].cdev
= NULL
;
1931 mutex_unlock(&thermal_list_lock
);
1933 thermal_zone_device_set_polling(tz
, 0);
1936 device_remove_file(&tz
->device
, &dev_attr_type
);
1937 device_remove_file(&tz
->device
, &dev_attr_temp
);
1938 if (tz
->ops
->get_mode
)
1939 device_remove_file(&tz
->device
, &dev_attr_mode
);
1940 device_remove_file(&tz
->device
, &dev_attr_policy
);
1941 device_remove_file(&tz
->device
, &dev_attr_available_policies
);
1942 remove_trip_attrs(tz
);
1943 thermal_set_governor(tz
, NULL
);
1945 thermal_remove_hwmon_sysfs(tz
);
1946 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
1947 idr_destroy(&tz
->idr
);
1948 mutex_destroy(&tz
->lock
);
1949 device_unregister(&tz
->device
);
1952 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister
);
1955 * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1956 * @name: thermal zone name to fetch the temperature
1958 * When only one zone is found with the passed name, returns a reference to it.
1960 * Return: On success returns a reference to an unique thermal zone with
1961 * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1962 * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1964 struct thermal_zone_device
*thermal_zone_get_zone_by_name(const char *name
)
1966 struct thermal_zone_device
*pos
= NULL
, *ref
= ERR_PTR(-EINVAL
);
1967 unsigned int found
= 0;
1972 mutex_lock(&thermal_list_lock
);
1973 list_for_each_entry(pos
, &thermal_tz_list
, node
)
1974 if (!strncasecmp(name
, pos
->type
, THERMAL_NAME_LENGTH
)) {
1978 mutex_unlock(&thermal_list_lock
);
1980 /* nothing has been found, thus an error code for it */
1982 ref
= ERR_PTR(-ENODEV
);
1984 /* Success only when an unique zone is found */
1985 ref
= ERR_PTR(-EEXIST
);
1990 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name
);
1993 static const struct genl_multicast_group thermal_event_mcgrps
[] = {
1994 { .name
= THERMAL_GENL_MCAST_GROUP_NAME
, },
1997 static struct genl_family thermal_event_genl_family
= {
1998 .id
= GENL_ID_GENERATE
,
1999 .name
= THERMAL_GENL_FAMILY_NAME
,
2000 .version
= THERMAL_GENL_VERSION
,
2001 .maxattr
= THERMAL_GENL_ATTR_MAX
,
2002 .mcgrps
= thermal_event_mcgrps
,
2003 .n_mcgrps
= ARRAY_SIZE(thermal_event_mcgrps
),
2006 int thermal_generate_netlink_event(struct thermal_zone_device
*tz
,
2009 struct sk_buff
*skb
;
2010 struct nlattr
*attr
;
2011 struct thermal_genl_event
*thermal_event
;
2015 static unsigned int thermal_event_seqnum
;
2020 /* allocate memory */
2021 size
= nla_total_size(sizeof(struct thermal_genl_event
)) +
2024 skb
= genlmsg_new(size
, GFP_ATOMIC
);
2028 /* add the genetlink message header */
2029 msg_header
= genlmsg_put(skb
, 0, thermal_event_seqnum
++,
2030 &thermal_event_genl_family
, 0,
2031 THERMAL_GENL_CMD_EVENT
);
2038 attr
= nla_reserve(skb
, THERMAL_GENL_ATTR_EVENT
,
2039 sizeof(struct thermal_genl_event
));
2046 thermal_event
= nla_data(attr
);
2047 if (!thermal_event
) {
2052 memset(thermal_event
, 0, sizeof(struct thermal_genl_event
));
2054 thermal_event
->orig
= tz
->id
;
2055 thermal_event
->event
= event
;
2057 /* send multicast genetlink message */
2058 genlmsg_end(skb
, msg_header
);
2060 result
= genlmsg_multicast(&thermal_event_genl_family
, skb
, 0,
2063 dev_err(&tz
->device
, "Failed to send netlink event:%d", result
);
2067 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event
);
2069 static int genetlink_init(void)
2071 return genl_register_family(&thermal_event_genl_family
);
2074 static void genetlink_exit(void)
2076 genl_unregister_family(&thermal_event_genl_family
);
2078 #else /* !CONFIG_NET */
2079 static inline int genetlink_init(void) { return 0; }
2080 static inline void genetlink_exit(void) {}
2081 #endif /* !CONFIG_NET */
2083 static int __init
thermal_register_governors(void)
2087 result
= thermal_gov_step_wise_register();
2091 result
= thermal_gov_fair_share_register();
2095 result
= thermal_gov_bang_bang_register();
2099 result
= thermal_gov_user_space_register();
2103 return thermal_gov_power_allocator_register();
2106 static void thermal_unregister_governors(void)
2108 thermal_gov_step_wise_unregister();
2109 thermal_gov_fair_share_unregister();
2110 thermal_gov_bang_bang_unregister();
2111 thermal_gov_user_space_unregister();
2112 thermal_gov_power_allocator_unregister();
2115 static int __init
thermal_init(void)
2119 result
= thermal_register_governors();
2123 result
= class_register(&thermal_class
);
2125 goto unregister_governors
;
2127 result
= genetlink_init();
2129 goto unregister_class
;
2131 result
= of_parse_thermal_zones();
2140 class_unregister(&thermal_class
);
2141 unregister_governors
:
2142 thermal_unregister_governors();
2144 idr_destroy(&thermal_tz_idr
);
2145 idr_destroy(&thermal_cdev_idr
);
2146 mutex_destroy(&thermal_idr_lock
);
2147 mutex_destroy(&thermal_list_lock
);
2148 mutex_destroy(&thermal_governor_lock
);
2152 static void __exit
thermal_exit(void)
2154 of_thermal_destroy_zones();
2156 class_unregister(&thermal_class
);
2157 thermal_unregister_governors();
2158 idr_destroy(&thermal_tz_idr
);
2159 idr_destroy(&thermal_cdev_idr
);
2160 mutex_destroy(&thermal_idr_lock
);
2161 mutex_destroy(&thermal_list_lock
);
2162 mutex_destroy(&thermal_governor_lock
);
2165 fs_initcall(thermal_init
);
2166 module_exit(thermal_exit
);