2 * thermal.c - Generic Thermal Management Sysfs support.
4 * Copyright (C) 2008 Intel Corp
5 * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
6 * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2 of the License.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
28 #include <linux/module.h>
29 #include <linux/device.h>
30 #include <linux/err.h>
31 #include <linux/slab.h>
32 #include <linux/kdev_t.h>
33 #include <linux/idr.h>
34 #include <linux/thermal.h>
35 #include <linux/reboot.h>
36 #include <linux/string.h>
38 #include <net/netlink.h>
39 #include <net/genetlink.h>
41 #define CREATE_TRACE_POINTS
42 #include <trace/events/thermal.h>
44 #include "thermal_core.h"
45 #include "thermal_hwmon.h"
47 MODULE_AUTHOR("Zhang Rui");
48 MODULE_DESCRIPTION("Generic thermal management sysfs support");
49 MODULE_LICENSE("GPL v2");
51 static DEFINE_IDR(thermal_tz_idr
);
52 static DEFINE_IDR(thermal_cdev_idr
);
53 static DEFINE_MUTEX(thermal_idr_lock
);
55 static LIST_HEAD(thermal_tz_list
);
56 static LIST_HEAD(thermal_cdev_list
);
57 static LIST_HEAD(thermal_governor_list
);
59 static DEFINE_MUTEX(thermal_list_lock
);
60 static DEFINE_MUTEX(thermal_governor_lock
);
62 static struct thermal_governor
*def_governor
;
64 static struct thermal_governor
*__find_governor(const char *name
)
66 struct thermal_governor
*pos
;
68 if (!name
|| !name
[0])
71 list_for_each_entry(pos
, &thermal_governor_list
, governor_list
)
72 if (!strncasecmp(name
, pos
->name
, THERMAL_NAME_LENGTH
))
78 int thermal_register_governor(struct thermal_governor
*governor
)
82 struct thermal_zone_device
*pos
;
87 mutex_lock(&thermal_governor_lock
);
90 if (__find_governor(governor
->name
) == NULL
) {
92 list_add(&governor
->governor_list
, &thermal_governor_list
);
93 if (!def_governor
&& !strncmp(governor
->name
,
94 DEFAULT_THERMAL_GOVERNOR
, THERMAL_NAME_LENGTH
))
95 def_governor
= governor
;
98 mutex_lock(&thermal_list_lock
);
100 list_for_each_entry(pos
, &thermal_tz_list
, node
) {
102 * only thermal zones with specified tz->tzp->governor_name
103 * may run with tz->govenor unset
108 name
= pos
->tzp
->governor_name
;
110 if (!strncasecmp(name
, governor
->name
, THERMAL_NAME_LENGTH
))
111 pos
->governor
= governor
;
114 mutex_unlock(&thermal_list_lock
);
115 mutex_unlock(&thermal_governor_lock
);
120 void thermal_unregister_governor(struct thermal_governor
*governor
)
122 struct thermal_zone_device
*pos
;
127 mutex_lock(&thermal_governor_lock
);
129 if (__find_governor(governor
->name
) == NULL
)
132 mutex_lock(&thermal_list_lock
);
134 list_for_each_entry(pos
, &thermal_tz_list
, node
) {
135 if (!strncasecmp(pos
->governor
->name
, governor
->name
,
136 THERMAL_NAME_LENGTH
))
137 pos
->governor
= NULL
;
140 mutex_unlock(&thermal_list_lock
);
141 list_del(&governor
->governor_list
);
143 mutex_unlock(&thermal_governor_lock
);
147 static int get_idr(struct idr
*idr
, struct mutex
*lock
, int *id
)
153 ret
= idr_alloc(idr
, NULL
, 0, 0, GFP_KERNEL
);
156 if (unlikely(ret
< 0))
162 static void release_idr(struct idr
*idr
, struct mutex
*lock
, int id
)
171 int get_tz_trend(struct thermal_zone_device
*tz
, int trip
)
173 enum thermal_trend trend
;
175 if (tz
->emul_temperature
|| !tz
->ops
->get_trend
||
176 tz
->ops
->get_trend(tz
, trip
, &trend
)) {
177 if (tz
->temperature
> tz
->last_temperature
)
178 trend
= THERMAL_TREND_RAISING
;
179 else if (tz
->temperature
< tz
->last_temperature
)
180 trend
= THERMAL_TREND_DROPPING
;
182 trend
= THERMAL_TREND_STABLE
;
187 EXPORT_SYMBOL(get_tz_trend
);
189 struct thermal_instance
*get_thermal_instance(struct thermal_zone_device
*tz
,
190 struct thermal_cooling_device
*cdev
, int trip
)
192 struct thermal_instance
*pos
= NULL
;
193 struct thermal_instance
*target_instance
= NULL
;
195 mutex_lock(&tz
->lock
);
196 mutex_lock(&cdev
->lock
);
198 list_for_each_entry(pos
, &tz
->thermal_instances
, tz_node
) {
199 if (pos
->tz
== tz
&& pos
->trip
== trip
&& pos
->cdev
== cdev
) {
200 target_instance
= pos
;
205 mutex_unlock(&cdev
->lock
);
206 mutex_unlock(&tz
->lock
);
208 return target_instance
;
210 EXPORT_SYMBOL(get_thermal_instance
);
212 static void print_bind_err_msg(struct thermal_zone_device
*tz
,
213 struct thermal_cooling_device
*cdev
, int ret
)
215 dev_err(&tz
->device
, "binding zone %s with cdev %s failed:%d\n",
216 tz
->type
, cdev
->type
, ret
);
219 static void __bind(struct thermal_zone_device
*tz
, int mask
,
220 struct thermal_cooling_device
*cdev
,
221 unsigned long *limits
)
225 for (i
= 0; i
< tz
->trips
; i
++) {
226 if (mask
& (1 << i
)) {
227 unsigned long upper
, lower
;
229 upper
= THERMAL_NO_LIMIT
;
230 lower
= THERMAL_NO_LIMIT
;
232 lower
= limits
[i
* 2];
233 upper
= limits
[i
* 2 + 1];
235 ret
= thermal_zone_bind_cooling_device(tz
, i
, cdev
,
238 print_bind_err_msg(tz
, cdev
, ret
);
243 static void __unbind(struct thermal_zone_device
*tz
, int mask
,
244 struct thermal_cooling_device
*cdev
)
248 for (i
= 0; i
< tz
->trips
; i
++)
250 thermal_zone_unbind_cooling_device(tz
, i
, cdev
);
253 static void bind_cdev(struct thermal_cooling_device
*cdev
)
256 const struct thermal_zone_params
*tzp
;
257 struct thermal_zone_device
*pos
= NULL
;
259 mutex_lock(&thermal_list_lock
);
261 list_for_each_entry(pos
, &thermal_tz_list
, node
) {
262 if (!pos
->tzp
&& !pos
->ops
->bind
)
265 if (pos
->ops
->bind
) {
266 ret
= pos
->ops
->bind(pos
, cdev
);
268 print_bind_err_msg(pos
, cdev
, ret
);
273 if (!tzp
|| !tzp
->tbp
)
276 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
277 if (tzp
->tbp
[i
].cdev
|| !tzp
->tbp
[i
].match
)
279 if (tzp
->tbp
[i
].match(pos
, cdev
))
281 tzp
->tbp
[i
].cdev
= cdev
;
282 __bind(pos
, tzp
->tbp
[i
].trip_mask
, cdev
,
283 tzp
->tbp
[i
].binding_limits
);
287 mutex_unlock(&thermal_list_lock
);
290 static void bind_tz(struct thermal_zone_device
*tz
)
293 struct thermal_cooling_device
*pos
= NULL
;
294 const struct thermal_zone_params
*tzp
= tz
->tzp
;
296 if (!tzp
&& !tz
->ops
->bind
)
299 mutex_lock(&thermal_list_lock
);
301 /* If there is ops->bind, try to use ops->bind */
303 list_for_each_entry(pos
, &thermal_cdev_list
, node
) {
304 ret
= tz
->ops
->bind(tz
, pos
);
306 print_bind_err_msg(tz
, pos
, ret
);
311 if (!tzp
|| !tzp
->tbp
)
314 list_for_each_entry(pos
, &thermal_cdev_list
, node
) {
315 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
316 if (tzp
->tbp
[i
].cdev
|| !tzp
->tbp
[i
].match
)
318 if (tzp
->tbp
[i
].match(tz
, pos
))
320 tzp
->tbp
[i
].cdev
= pos
;
321 __bind(tz
, tzp
->tbp
[i
].trip_mask
, pos
,
322 tzp
->tbp
[i
].binding_limits
);
326 mutex_unlock(&thermal_list_lock
);
329 static void thermal_zone_device_set_polling(struct thermal_zone_device
*tz
,
333 mod_delayed_work(system_freezable_wq
, &tz
->poll_queue
,
334 round_jiffies(msecs_to_jiffies(delay
)));
336 mod_delayed_work(system_freezable_wq
, &tz
->poll_queue
,
337 msecs_to_jiffies(delay
));
339 cancel_delayed_work(&tz
->poll_queue
);
342 static void monitor_thermal_zone(struct thermal_zone_device
*tz
)
344 mutex_lock(&tz
->lock
);
347 thermal_zone_device_set_polling(tz
, tz
->passive_delay
);
348 else if (tz
->polling_delay
)
349 thermal_zone_device_set_polling(tz
, tz
->polling_delay
);
351 thermal_zone_device_set_polling(tz
, 0);
353 mutex_unlock(&tz
->lock
);
356 static void handle_non_critical_trips(struct thermal_zone_device
*tz
,
357 int trip
, enum thermal_trip_type trip_type
)
359 tz
->governor
? tz
->governor
->throttle(tz
, trip
) :
360 def_governor
->throttle(tz
, trip
);
363 static void handle_critical_trips(struct thermal_zone_device
*tz
,
364 int trip
, enum thermal_trip_type trip_type
)
368 tz
->ops
->get_trip_temp(tz
, trip
, &trip_temp
);
370 /* If we have not crossed the trip_temp, we do not care. */
371 if (trip_temp
<= 0 || tz
->temperature
< trip_temp
)
374 trace_thermal_zone_trip(tz
, trip
, trip_type
);
377 tz
->ops
->notify(tz
, trip
, trip_type
);
379 if (trip_type
== THERMAL_TRIP_CRITICAL
) {
380 dev_emerg(&tz
->device
,
381 "critical temperature reached(%d C),shutting down\n",
382 tz
->temperature
/ 1000);
383 orderly_poweroff(true);
387 static void handle_thermal_trip(struct thermal_zone_device
*tz
, int trip
)
389 enum thermal_trip_type type
;
391 tz
->ops
->get_trip_type(tz
, trip
, &type
);
393 if (type
== THERMAL_TRIP_CRITICAL
|| type
== THERMAL_TRIP_HOT
)
394 handle_critical_trips(tz
, trip
, type
);
396 handle_non_critical_trips(tz
, trip
, type
);
398 * Alright, we handled this trip successfully.
399 * So, start monitoring again.
401 monitor_thermal_zone(tz
);
405 * thermal_zone_get_temp() - returns its the temperature of thermal zone
406 * @tz: a valid pointer to a struct thermal_zone_device
407 * @temp: a valid pointer to where to store the resulting temperature.
409 * When a valid thermal zone reference is passed, it will fetch its
410 * temperature and fill @temp.
412 * Return: On success returns 0, an error code otherwise
414 int thermal_zone_get_temp(struct thermal_zone_device
*tz
, unsigned long *temp
)
417 #ifdef CONFIG_THERMAL_EMULATION
419 unsigned long crit_temp
= -1UL;
420 enum thermal_trip_type type
;
423 if (!tz
|| IS_ERR(tz
) || !tz
->ops
->get_temp
)
426 mutex_lock(&tz
->lock
);
428 ret
= tz
->ops
->get_temp(tz
, temp
);
429 #ifdef CONFIG_THERMAL_EMULATION
430 if (!tz
->emul_temperature
)
433 for (count
= 0; count
< tz
->trips
; count
++) {
434 ret
= tz
->ops
->get_trip_type(tz
, count
, &type
);
435 if (!ret
&& type
== THERMAL_TRIP_CRITICAL
) {
436 ret
= tz
->ops
->get_trip_temp(tz
, count
, &crit_temp
);
444 if (*temp
< crit_temp
)
445 *temp
= tz
->emul_temperature
;
448 mutex_unlock(&tz
->lock
);
452 EXPORT_SYMBOL_GPL(thermal_zone_get_temp
);
454 static void update_temperature(struct thermal_zone_device
*tz
)
459 ret
= thermal_zone_get_temp(tz
, &temp
);
461 dev_warn(&tz
->device
, "failed to read out thermal zone %d\n",
466 mutex_lock(&tz
->lock
);
467 tz
->last_temperature
= tz
->temperature
;
468 tz
->temperature
= temp
;
469 mutex_unlock(&tz
->lock
);
471 trace_thermal_temperature(tz
);
472 dev_dbg(&tz
->device
, "last_temperature=%d, current_temperature=%d\n",
473 tz
->last_temperature
, tz
->temperature
);
476 void thermal_zone_device_update(struct thermal_zone_device
*tz
)
480 if (!tz
->ops
->get_temp
)
483 update_temperature(tz
);
485 for (count
= 0; count
< tz
->trips
; count
++)
486 handle_thermal_trip(tz
, count
);
488 EXPORT_SYMBOL_GPL(thermal_zone_device_update
);
490 static void thermal_zone_device_check(struct work_struct
*work
)
492 struct thermal_zone_device
*tz
= container_of(work
, struct
495 thermal_zone_device_update(tz
);
498 /* sys I/F for thermal zone */
500 #define to_thermal_zone(_dev) \
501 container_of(_dev, struct thermal_zone_device, device)
504 type_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
506 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
508 return sprintf(buf
, "%s\n", tz
->type
);
512 temp_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
514 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
518 ret
= thermal_zone_get_temp(tz
, &temperature
);
523 return sprintf(buf
, "%ld\n", temperature
);
527 mode_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
529 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
530 enum thermal_device_mode mode
;
533 if (!tz
->ops
->get_mode
)
536 result
= tz
->ops
->get_mode(tz
, &mode
);
540 return sprintf(buf
, "%s\n", mode
== THERMAL_DEVICE_ENABLED
? "enabled"
545 mode_store(struct device
*dev
, struct device_attribute
*attr
,
546 const char *buf
, size_t count
)
548 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
551 if (!tz
->ops
->set_mode
)
554 if (!strncmp(buf
, "enabled", sizeof("enabled") - 1))
555 result
= tz
->ops
->set_mode(tz
, THERMAL_DEVICE_ENABLED
);
556 else if (!strncmp(buf
, "disabled", sizeof("disabled") - 1))
557 result
= tz
->ops
->set_mode(tz
, THERMAL_DEVICE_DISABLED
);
568 trip_point_type_show(struct device
*dev
, struct device_attribute
*attr
,
571 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
572 enum thermal_trip_type type
;
575 if (!tz
->ops
->get_trip_type
)
578 if (!sscanf(attr
->attr
.name
, "trip_point_%d_type", &trip
))
581 result
= tz
->ops
->get_trip_type(tz
, trip
, &type
);
586 case THERMAL_TRIP_CRITICAL
:
587 return sprintf(buf
, "critical\n");
588 case THERMAL_TRIP_HOT
:
589 return sprintf(buf
, "hot\n");
590 case THERMAL_TRIP_PASSIVE
:
591 return sprintf(buf
, "passive\n");
592 case THERMAL_TRIP_ACTIVE
:
593 return sprintf(buf
, "active\n");
595 return sprintf(buf
, "unknown\n");
600 trip_point_temp_store(struct device
*dev
, struct device_attribute
*attr
,
601 const char *buf
, size_t count
)
603 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
605 unsigned long temperature
;
607 if (!tz
->ops
->set_trip_temp
)
610 if (!sscanf(attr
->attr
.name
, "trip_point_%d_temp", &trip
))
613 if (kstrtoul(buf
, 10, &temperature
))
616 ret
= tz
->ops
->set_trip_temp(tz
, trip
, temperature
);
618 return ret
? ret
: count
;
622 trip_point_temp_show(struct device
*dev
, struct device_attribute
*attr
,
625 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
629 if (!tz
->ops
->get_trip_temp
)
632 if (!sscanf(attr
->attr
.name
, "trip_point_%d_temp", &trip
))
635 ret
= tz
->ops
->get_trip_temp(tz
, trip
, &temperature
);
640 return sprintf(buf
, "%ld\n", temperature
);
644 trip_point_hyst_store(struct device
*dev
, struct device_attribute
*attr
,
645 const char *buf
, size_t count
)
647 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
649 unsigned long temperature
;
651 if (!tz
->ops
->set_trip_hyst
)
654 if (!sscanf(attr
->attr
.name
, "trip_point_%d_hyst", &trip
))
657 if (kstrtoul(buf
, 10, &temperature
))
661 * We are not doing any check on the 'temperature' value
662 * here. The driver implementing 'set_trip_hyst' has to
665 ret
= tz
->ops
->set_trip_hyst(tz
, trip
, temperature
);
667 return ret
? ret
: count
;
671 trip_point_hyst_show(struct device
*dev
, struct device_attribute
*attr
,
674 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
676 unsigned long temperature
;
678 if (!tz
->ops
->get_trip_hyst
)
681 if (!sscanf(attr
->attr
.name
, "trip_point_%d_hyst", &trip
))
684 ret
= tz
->ops
->get_trip_hyst(tz
, trip
, &temperature
);
686 return ret
? ret
: sprintf(buf
, "%ld\n", temperature
);
690 passive_store(struct device
*dev
, struct device_attribute
*attr
,
691 const char *buf
, size_t count
)
693 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
694 struct thermal_cooling_device
*cdev
= NULL
;
697 if (!sscanf(buf
, "%d\n", &state
))
700 /* sanity check: values below 1000 millicelcius don't make sense
701 * and can cause the system to go into a thermal heart attack
703 if (state
&& state
< 1000)
706 if (state
&& !tz
->forced_passive
) {
707 mutex_lock(&thermal_list_lock
);
708 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
709 if (!strncmp("Processor", cdev
->type
,
710 sizeof("Processor")))
711 thermal_zone_bind_cooling_device(tz
,
712 THERMAL_TRIPS_NONE
, cdev
,
716 mutex_unlock(&thermal_list_lock
);
717 if (!tz
->passive_delay
)
718 tz
->passive_delay
= 1000;
719 } else if (!state
&& tz
->forced_passive
) {
720 mutex_lock(&thermal_list_lock
);
721 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
722 if (!strncmp("Processor", cdev
->type
,
723 sizeof("Processor")))
724 thermal_zone_unbind_cooling_device(tz
,
728 mutex_unlock(&thermal_list_lock
);
729 tz
->passive_delay
= 0;
732 tz
->forced_passive
= state
;
734 thermal_zone_device_update(tz
);
740 passive_show(struct device
*dev
, struct device_attribute
*attr
,
743 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
745 return sprintf(buf
, "%d\n", tz
->forced_passive
);
749 policy_store(struct device
*dev
, struct device_attribute
*attr
,
750 const char *buf
, size_t count
)
753 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
754 struct thermal_governor
*gov
;
755 char name
[THERMAL_NAME_LENGTH
];
757 snprintf(name
, sizeof(name
), "%s", buf
);
759 mutex_lock(&thermal_governor_lock
);
760 mutex_lock(&tz
->lock
);
762 gov
= __find_governor(strim(name
));
770 mutex_unlock(&tz
->lock
);
771 mutex_unlock(&thermal_governor_lock
);
776 policy_show(struct device
*dev
, struct device_attribute
*devattr
, char *buf
)
778 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
780 return sprintf(buf
, "%s\n", tz
->governor
->name
);
783 #ifdef CONFIG_THERMAL_EMULATION
785 emul_temp_store(struct device
*dev
, struct device_attribute
*attr
,
786 const char *buf
, size_t count
)
788 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
790 unsigned long temperature
;
792 if (kstrtoul(buf
, 10, &temperature
))
795 if (!tz
->ops
->set_emul_temp
) {
796 mutex_lock(&tz
->lock
);
797 tz
->emul_temperature
= temperature
;
798 mutex_unlock(&tz
->lock
);
800 ret
= tz
->ops
->set_emul_temp(tz
, temperature
);
804 thermal_zone_device_update(tz
);
806 return ret
? ret
: count
;
808 static DEVICE_ATTR(emul_temp
, S_IWUSR
, NULL
, emul_temp_store
);
809 #endif/*CONFIG_THERMAL_EMULATION*/
811 static DEVICE_ATTR(type
, 0444, type_show
, NULL
);
812 static DEVICE_ATTR(temp
, 0444, temp_show
, NULL
);
813 static DEVICE_ATTR(mode
, 0644, mode_show
, mode_store
);
814 static DEVICE_ATTR(passive
, S_IRUGO
| S_IWUSR
, passive_show
, passive_store
);
815 static DEVICE_ATTR(policy
, S_IRUGO
| S_IWUSR
, policy_show
, policy_store
);
817 /* sys I/F for cooling device */
818 #define to_cooling_device(_dev) \
819 container_of(_dev, struct thermal_cooling_device, device)
822 thermal_cooling_device_type_show(struct device
*dev
,
823 struct device_attribute
*attr
, char *buf
)
825 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
827 return sprintf(buf
, "%s\n", cdev
->type
);
831 thermal_cooling_device_max_state_show(struct device
*dev
,
832 struct device_attribute
*attr
, char *buf
)
834 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
838 ret
= cdev
->ops
->get_max_state(cdev
, &state
);
841 return sprintf(buf
, "%ld\n", state
);
845 thermal_cooling_device_cur_state_show(struct device
*dev
,
846 struct device_attribute
*attr
, char *buf
)
848 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
852 ret
= cdev
->ops
->get_cur_state(cdev
, &state
);
855 return sprintf(buf
, "%ld\n", state
);
859 thermal_cooling_device_cur_state_store(struct device
*dev
,
860 struct device_attribute
*attr
,
861 const char *buf
, size_t count
)
863 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
867 if (!sscanf(buf
, "%ld\n", &state
))
873 result
= cdev
->ops
->set_cur_state(cdev
, state
);
879 static struct device_attribute dev_attr_cdev_type
=
880 __ATTR(type
, 0444, thermal_cooling_device_type_show
, NULL
);
881 static DEVICE_ATTR(max_state
, 0444,
882 thermal_cooling_device_max_state_show
, NULL
);
883 static DEVICE_ATTR(cur_state
, 0644,
884 thermal_cooling_device_cur_state_show
,
885 thermal_cooling_device_cur_state_store
);
888 thermal_cooling_device_trip_point_show(struct device
*dev
,
889 struct device_attribute
*attr
, char *buf
)
891 struct thermal_instance
*instance
;
894 container_of(attr
, struct thermal_instance
, attr
);
896 if (instance
->trip
== THERMAL_TRIPS_NONE
)
897 return sprintf(buf
, "-1\n");
899 return sprintf(buf
, "%d\n", instance
->trip
);
902 /* Device management */
905 * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
906 * @tz: pointer to struct thermal_zone_device
907 * @trip: indicates which trip point the cooling devices is
908 * associated with in this thermal zone.
909 * @cdev: pointer to struct thermal_cooling_device
910 * @upper: the Maximum cooling state for this trip point.
911 * THERMAL_NO_LIMIT means no upper limit,
912 * and the cooling device can be in max_state.
913 * @lower: the Minimum cooling state can be used for this trip point.
914 * THERMAL_NO_LIMIT means no lower limit,
915 * and the cooling device can be in cooling state 0.
917 * This interface function bind a thermal cooling device to the certain trip
918 * point of a thermal zone device.
919 * This function is usually called in the thermal zone device .bind callback.
921 * Return: 0 on success, the proper error value otherwise.
923 int thermal_zone_bind_cooling_device(struct thermal_zone_device
*tz
,
925 struct thermal_cooling_device
*cdev
,
926 unsigned long upper
, unsigned long lower
)
928 struct thermal_instance
*dev
;
929 struct thermal_instance
*pos
;
930 struct thermal_zone_device
*pos1
;
931 struct thermal_cooling_device
*pos2
;
932 unsigned long max_state
;
935 if (trip
>= tz
->trips
|| (trip
< 0 && trip
!= THERMAL_TRIPS_NONE
))
938 list_for_each_entry(pos1
, &thermal_tz_list
, node
) {
942 list_for_each_entry(pos2
, &thermal_cdev_list
, node
) {
947 if (tz
!= pos1
|| cdev
!= pos2
)
950 ret
= cdev
->ops
->get_max_state(cdev
, &max_state
);
954 /* lower default 0, upper default max_state */
955 lower
= lower
== THERMAL_NO_LIMIT
? 0 : lower
;
956 upper
= upper
== THERMAL_NO_LIMIT
? max_state
: upper
;
958 if (lower
> upper
|| upper
> max_state
)
962 kzalloc(sizeof(struct thermal_instance
), GFP_KERNEL
);
970 dev
->target
= THERMAL_NO_TARGET
;
972 result
= get_idr(&tz
->idr
, &tz
->lock
, &dev
->id
);
976 sprintf(dev
->name
, "cdev%d", dev
->id
);
978 sysfs_create_link(&tz
->device
.kobj
, &cdev
->device
.kobj
, dev
->name
);
982 sprintf(dev
->attr_name
, "cdev%d_trip_point", dev
->id
);
983 sysfs_attr_init(&dev
->attr
.attr
);
984 dev
->attr
.attr
.name
= dev
->attr_name
;
985 dev
->attr
.attr
.mode
= 0444;
986 dev
->attr
.show
= thermal_cooling_device_trip_point_show
;
987 result
= device_create_file(&tz
->device
, &dev
->attr
);
989 goto remove_symbol_link
;
991 mutex_lock(&tz
->lock
);
992 mutex_lock(&cdev
->lock
);
993 list_for_each_entry(pos
, &tz
->thermal_instances
, tz_node
)
994 if (pos
->tz
== tz
&& pos
->trip
== trip
&& pos
->cdev
== cdev
) {
999 list_add_tail(&dev
->tz_node
, &tz
->thermal_instances
);
1000 list_add_tail(&dev
->cdev_node
, &cdev
->thermal_instances
);
1002 mutex_unlock(&cdev
->lock
);
1003 mutex_unlock(&tz
->lock
);
1008 device_remove_file(&tz
->device
, &dev
->attr
);
1010 sysfs_remove_link(&tz
->device
.kobj
, dev
->name
);
1012 release_idr(&tz
->idr
, &tz
->lock
, dev
->id
);
1017 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device
);
1020 * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1022 * @tz: pointer to a struct thermal_zone_device.
1023 * @trip: indicates which trip point the cooling devices is
1024 * associated with in this thermal zone.
1025 * @cdev: pointer to a struct thermal_cooling_device.
1027 * This interface function unbind a thermal cooling device from the certain
1028 * trip point of a thermal zone device.
1029 * This function is usually called in the thermal zone device .unbind callback.
1031 * Return: 0 on success, the proper error value otherwise.
1033 int thermal_zone_unbind_cooling_device(struct thermal_zone_device
*tz
,
1035 struct thermal_cooling_device
*cdev
)
1037 struct thermal_instance
*pos
, *next
;
1039 mutex_lock(&tz
->lock
);
1040 mutex_lock(&cdev
->lock
);
1041 list_for_each_entry_safe(pos
, next
, &tz
->thermal_instances
, tz_node
) {
1042 if (pos
->tz
== tz
&& pos
->trip
== trip
&& pos
->cdev
== cdev
) {
1043 list_del(&pos
->tz_node
);
1044 list_del(&pos
->cdev_node
);
1045 mutex_unlock(&cdev
->lock
);
1046 mutex_unlock(&tz
->lock
);
1050 mutex_unlock(&cdev
->lock
);
1051 mutex_unlock(&tz
->lock
);
1056 device_remove_file(&tz
->device
, &pos
->attr
);
1057 sysfs_remove_link(&tz
->device
.kobj
, pos
->name
);
1058 release_idr(&tz
->idr
, &tz
->lock
, pos
->id
);
1062 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device
);
1064 static void thermal_release(struct device
*dev
)
1066 struct thermal_zone_device
*tz
;
1067 struct thermal_cooling_device
*cdev
;
1069 if (!strncmp(dev_name(dev
), "thermal_zone",
1070 sizeof("thermal_zone") - 1)) {
1071 tz
= to_thermal_zone(dev
);
1073 } else if(!strncmp(dev_name(dev
), "cooling_device",
1074 sizeof("cooling_device") - 1)){
1075 cdev
= to_cooling_device(dev
);
1080 static struct class thermal_class
= {
1082 .dev_release
= thermal_release
,
1086 * __thermal_cooling_device_register() - register a new thermal cooling device
1087 * @np: a pointer to a device tree node.
1088 * @type: the thermal cooling device type.
1089 * @devdata: device private data.
1090 * @ops: standard thermal cooling devices callbacks.
1092 * This interface function adds a new thermal cooling device (fan/processor/...)
1093 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1094 * to all the thermal zone devices registered at the same time.
1095 * It also gives the opportunity to link the cooling device to a device tree
1096 * node, so that it can be bound to a thermal zone created out of device tree.
1098 * Return: a pointer to the created struct thermal_cooling_device or an
1099 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1101 static struct thermal_cooling_device
*
1102 __thermal_cooling_device_register(struct device_node
*np
,
1103 char *type
, void *devdata
,
1104 const struct thermal_cooling_device_ops
*ops
)
1106 struct thermal_cooling_device
*cdev
;
1109 if (type
&& strlen(type
) >= THERMAL_NAME_LENGTH
)
1110 return ERR_PTR(-EINVAL
);
1112 if (!ops
|| !ops
->get_max_state
|| !ops
->get_cur_state
||
1113 !ops
->set_cur_state
)
1114 return ERR_PTR(-EINVAL
);
1116 cdev
= kzalloc(sizeof(struct thermal_cooling_device
), GFP_KERNEL
);
1118 return ERR_PTR(-ENOMEM
);
1120 result
= get_idr(&thermal_cdev_idr
, &thermal_idr_lock
, &cdev
->id
);
1123 return ERR_PTR(result
);
1126 strlcpy(cdev
->type
, type
? : "", sizeof(cdev
->type
));
1127 mutex_init(&cdev
->lock
);
1128 INIT_LIST_HEAD(&cdev
->thermal_instances
);
1131 cdev
->updated
= false;
1132 cdev
->device
.class = &thermal_class
;
1133 cdev
->devdata
= devdata
;
1134 dev_set_name(&cdev
->device
, "cooling_device%d", cdev
->id
);
1135 result
= device_register(&cdev
->device
);
1137 release_idr(&thermal_cdev_idr
, &thermal_idr_lock
, cdev
->id
);
1139 return ERR_PTR(result
);
1144 result
= device_create_file(&cdev
->device
, &dev_attr_cdev_type
);
1149 result
= device_create_file(&cdev
->device
, &dev_attr_max_state
);
1153 result
= device_create_file(&cdev
->device
, &dev_attr_cur_state
);
1157 /* Add 'this' new cdev to the global cdev list */
1158 mutex_lock(&thermal_list_lock
);
1159 list_add(&cdev
->node
, &thermal_cdev_list
);
1160 mutex_unlock(&thermal_list_lock
);
1162 /* Update binding information for 'this' new cdev */
1168 release_idr(&thermal_cdev_idr
, &thermal_idr_lock
, cdev
->id
);
1169 device_unregister(&cdev
->device
);
1170 return ERR_PTR(result
);
1174 * thermal_cooling_device_register() - register a new thermal cooling device
1175 * @type: the thermal cooling device type.
1176 * @devdata: device private data.
1177 * @ops: standard thermal cooling devices callbacks.
1179 * This interface function adds a new thermal cooling device (fan/processor/...)
1180 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1181 * to all the thermal zone devices registered at the same time.
1183 * Return: a pointer to the created struct thermal_cooling_device or an
1184 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1186 struct thermal_cooling_device
*
1187 thermal_cooling_device_register(char *type
, void *devdata
,
1188 const struct thermal_cooling_device_ops
*ops
)
1190 return __thermal_cooling_device_register(NULL
, type
, devdata
, ops
);
1192 EXPORT_SYMBOL_GPL(thermal_cooling_device_register
);
1195 * thermal_of_cooling_device_register() - register an OF thermal cooling device
1196 * @np: a pointer to a device tree node.
1197 * @type: the thermal cooling device type.
1198 * @devdata: device private data.
1199 * @ops: standard thermal cooling devices callbacks.
1201 * This function will register a cooling device with device tree node reference.
1202 * This interface function adds a new thermal cooling device (fan/processor/...)
1203 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1204 * to all the thermal zone devices registered at the same time.
1206 * Return: a pointer to the created struct thermal_cooling_device or an
1207 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1209 struct thermal_cooling_device
*
1210 thermal_of_cooling_device_register(struct device_node
*np
,
1211 char *type
, void *devdata
,
1212 const struct thermal_cooling_device_ops
*ops
)
1214 return __thermal_cooling_device_register(np
, type
, devdata
, ops
);
1216 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register
);
1219 * thermal_cooling_device_unregister - removes the registered thermal cooling device
1220 * @cdev: the thermal cooling device to remove.
1222 * thermal_cooling_device_unregister() must be called when the device is no
1225 void thermal_cooling_device_unregister(struct thermal_cooling_device
*cdev
)
1228 const struct thermal_zone_params
*tzp
;
1229 struct thermal_zone_device
*tz
;
1230 struct thermal_cooling_device
*pos
= NULL
;
1235 mutex_lock(&thermal_list_lock
);
1236 list_for_each_entry(pos
, &thermal_cdev_list
, node
)
1240 /* thermal cooling device not found */
1241 mutex_unlock(&thermal_list_lock
);
1244 list_del(&cdev
->node
);
1246 /* Unbind all thermal zones associated with 'this' cdev */
1247 list_for_each_entry(tz
, &thermal_tz_list
, node
) {
1248 if (tz
->ops
->unbind
) {
1249 tz
->ops
->unbind(tz
, cdev
);
1253 if (!tz
->tzp
|| !tz
->tzp
->tbp
)
1257 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
1258 if (tzp
->tbp
[i
].cdev
== cdev
) {
1259 __unbind(tz
, tzp
->tbp
[i
].trip_mask
, cdev
);
1260 tzp
->tbp
[i
].cdev
= NULL
;
1265 mutex_unlock(&thermal_list_lock
);
1268 device_remove_file(&cdev
->device
, &dev_attr_cdev_type
);
1269 device_remove_file(&cdev
->device
, &dev_attr_max_state
);
1270 device_remove_file(&cdev
->device
, &dev_attr_cur_state
);
1272 release_idr(&thermal_cdev_idr
, &thermal_idr_lock
, cdev
->id
);
1273 device_unregister(&cdev
->device
);
1276 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister
);
1278 void thermal_cdev_update(struct thermal_cooling_device
*cdev
)
1280 struct thermal_instance
*instance
;
1281 unsigned long target
= 0;
1283 /* cooling device is updated*/
1287 mutex_lock(&cdev
->lock
);
1288 /* Make sure cdev enters the deepest cooling state */
1289 list_for_each_entry(instance
, &cdev
->thermal_instances
, cdev_node
) {
1290 dev_dbg(&cdev
->device
, "zone%d->target=%lu\n",
1291 instance
->tz
->id
, instance
->target
);
1292 if (instance
->target
== THERMAL_NO_TARGET
)
1294 if (instance
->target
> target
)
1295 target
= instance
->target
;
1297 mutex_unlock(&cdev
->lock
);
1298 cdev
->ops
->set_cur_state(cdev
, target
);
1299 cdev
->updated
= true;
1300 trace_cdev_update(cdev
, target
);
1301 dev_dbg(&cdev
->device
, "set to state %lu\n", target
);
1303 EXPORT_SYMBOL(thermal_cdev_update
);
1306 * thermal_notify_framework - Sensor drivers use this API to notify framework
1307 * @tz: thermal zone device
1308 * @trip: indicates which trip point has been crossed
1310 * This function handles the trip events from sensor drivers. It starts
1311 * throttling the cooling devices according to the policy configured.
1312 * For CRITICAL and HOT trip points, this notifies the respective drivers,
1313 * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1314 * The throttling policy is based on the configured platform data; if no
1315 * platform data is provided, this uses the step_wise throttling policy.
1317 void thermal_notify_framework(struct thermal_zone_device
*tz
, int trip
)
1319 handle_thermal_trip(tz
, trip
);
1321 EXPORT_SYMBOL_GPL(thermal_notify_framework
);
1324 * create_trip_attrs() - create attributes for trip points
1325 * @tz: the thermal zone device
1326 * @mask: Writeable trip point bitmap.
1328 * helper function to instantiate sysfs entries for every trip
1329 * point and its properties of a struct thermal_zone_device.
1331 * Return: 0 on success, the proper error value otherwise.
1333 static int create_trip_attrs(struct thermal_zone_device
*tz
, int mask
)
1336 int size
= sizeof(struct thermal_attr
) * tz
->trips
;
1338 tz
->trip_type_attrs
= kzalloc(size
, GFP_KERNEL
);
1339 if (!tz
->trip_type_attrs
)
1342 tz
->trip_temp_attrs
= kzalloc(size
, GFP_KERNEL
);
1343 if (!tz
->trip_temp_attrs
) {
1344 kfree(tz
->trip_type_attrs
);
1348 if (tz
->ops
->get_trip_hyst
) {
1349 tz
->trip_hyst_attrs
= kzalloc(size
, GFP_KERNEL
);
1350 if (!tz
->trip_hyst_attrs
) {
1351 kfree(tz
->trip_type_attrs
);
1352 kfree(tz
->trip_temp_attrs
);
1358 for (indx
= 0; indx
< tz
->trips
; indx
++) {
1359 /* create trip type attribute */
1360 snprintf(tz
->trip_type_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1361 "trip_point_%d_type", indx
);
1363 sysfs_attr_init(&tz
->trip_type_attrs
[indx
].attr
.attr
);
1364 tz
->trip_type_attrs
[indx
].attr
.attr
.name
=
1365 tz
->trip_type_attrs
[indx
].name
;
1366 tz
->trip_type_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1367 tz
->trip_type_attrs
[indx
].attr
.show
= trip_point_type_show
;
1369 device_create_file(&tz
->device
,
1370 &tz
->trip_type_attrs
[indx
].attr
);
1372 /* create trip temp attribute */
1373 snprintf(tz
->trip_temp_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1374 "trip_point_%d_temp", indx
);
1376 sysfs_attr_init(&tz
->trip_temp_attrs
[indx
].attr
.attr
);
1377 tz
->trip_temp_attrs
[indx
].attr
.attr
.name
=
1378 tz
->trip_temp_attrs
[indx
].name
;
1379 tz
->trip_temp_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1380 tz
->trip_temp_attrs
[indx
].attr
.show
= trip_point_temp_show
;
1381 if (mask
& (1 << indx
)) {
1382 tz
->trip_temp_attrs
[indx
].attr
.attr
.mode
|= S_IWUSR
;
1383 tz
->trip_temp_attrs
[indx
].attr
.store
=
1384 trip_point_temp_store
;
1387 device_create_file(&tz
->device
,
1388 &tz
->trip_temp_attrs
[indx
].attr
);
1390 /* create Optional trip hyst attribute */
1391 if (!tz
->ops
->get_trip_hyst
)
1393 snprintf(tz
->trip_hyst_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1394 "trip_point_%d_hyst", indx
);
1396 sysfs_attr_init(&tz
->trip_hyst_attrs
[indx
].attr
.attr
);
1397 tz
->trip_hyst_attrs
[indx
].attr
.attr
.name
=
1398 tz
->trip_hyst_attrs
[indx
].name
;
1399 tz
->trip_hyst_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1400 tz
->trip_hyst_attrs
[indx
].attr
.show
= trip_point_hyst_show
;
1401 if (tz
->ops
->set_trip_hyst
) {
1402 tz
->trip_hyst_attrs
[indx
].attr
.attr
.mode
|= S_IWUSR
;
1403 tz
->trip_hyst_attrs
[indx
].attr
.store
=
1404 trip_point_hyst_store
;
1407 device_create_file(&tz
->device
,
1408 &tz
->trip_hyst_attrs
[indx
].attr
);
1413 static void remove_trip_attrs(struct thermal_zone_device
*tz
)
1417 for (indx
= 0; indx
< tz
->trips
; indx
++) {
1418 device_remove_file(&tz
->device
,
1419 &tz
->trip_type_attrs
[indx
].attr
);
1420 device_remove_file(&tz
->device
,
1421 &tz
->trip_temp_attrs
[indx
].attr
);
1422 if (tz
->ops
->get_trip_hyst
)
1423 device_remove_file(&tz
->device
,
1424 &tz
->trip_hyst_attrs
[indx
].attr
);
1426 kfree(tz
->trip_type_attrs
);
1427 kfree(tz
->trip_temp_attrs
);
1428 kfree(tz
->trip_hyst_attrs
);
1432 * thermal_zone_device_register() - register a new thermal zone device
1433 * @type: the thermal zone device type
1434 * @trips: the number of trip points the thermal zone support
1435 * @mask: a bit string indicating the writeablility of trip points
1436 * @devdata: private device data
1437 * @ops: standard thermal zone device callbacks
1438 * @tzp: thermal zone platform parameters
1439 * @passive_delay: number of milliseconds to wait between polls when
1440 * performing passive cooling
1441 * @polling_delay: number of milliseconds to wait between polls when checking
1442 * whether trip points have been crossed (0 for interrupt
1445 * This interface function adds a new thermal zone device (sensor) to
1446 * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1447 * thermal cooling devices registered at the same time.
1448 * thermal_zone_device_unregister() must be called when the device is no
1449 * longer needed. The passive cooling depends on the .get_trend() return value.
1451 * Return: a pointer to the created struct thermal_zone_device or an
1452 * in case of error, an ERR_PTR. Caller must check return value with
1453 * IS_ERR*() helpers.
1455 struct thermal_zone_device
*thermal_zone_device_register(const char *type
,
1456 int trips
, int mask
, void *devdata
,
1457 struct thermal_zone_device_ops
*ops
,
1458 const struct thermal_zone_params
*tzp
,
1459 int passive_delay
, int polling_delay
)
1461 struct thermal_zone_device
*tz
;
1462 enum thermal_trip_type trip_type
;
1467 if (type
&& strlen(type
) >= THERMAL_NAME_LENGTH
)
1468 return ERR_PTR(-EINVAL
);
1470 if (trips
> THERMAL_MAX_TRIPS
|| trips
< 0 || mask
>> trips
)
1471 return ERR_PTR(-EINVAL
);
1474 return ERR_PTR(-EINVAL
);
1476 if (trips
> 0 && (!ops
->get_trip_type
|| !ops
->get_trip_temp
))
1477 return ERR_PTR(-EINVAL
);
1479 tz
= kzalloc(sizeof(struct thermal_zone_device
), GFP_KERNEL
);
1481 return ERR_PTR(-ENOMEM
);
1483 INIT_LIST_HEAD(&tz
->thermal_instances
);
1485 mutex_init(&tz
->lock
);
1486 result
= get_idr(&thermal_tz_idr
, &thermal_idr_lock
, &tz
->id
);
1489 return ERR_PTR(result
);
1492 strlcpy(tz
->type
, type
? : "", sizeof(tz
->type
));
1495 tz
->device
.class = &thermal_class
;
1496 tz
->devdata
= devdata
;
1498 tz
->passive_delay
= passive_delay
;
1499 tz
->polling_delay
= polling_delay
;
1501 dev_set_name(&tz
->device
, "thermal_zone%d", tz
->id
);
1502 result
= device_register(&tz
->device
);
1504 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
1506 return ERR_PTR(result
);
1511 result
= device_create_file(&tz
->device
, &dev_attr_type
);
1516 result
= device_create_file(&tz
->device
, &dev_attr_temp
);
1520 if (ops
->get_mode
) {
1521 result
= device_create_file(&tz
->device
, &dev_attr_mode
);
1526 result
= create_trip_attrs(tz
, mask
);
1530 for (count
= 0; count
< trips
; count
++) {
1531 tz
->ops
->get_trip_type(tz
, count
, &trip_type
);
1532 if (trip_type
== THERMAL_TRIP_PASSIVE
)
1537 result
= device_create_file(&tz
->device
, &dev_attr_passive
);
1542 #ifdef CONFIG_THERMAL_EMULATION
1543 result
= device_create_file(&tz
->device
, &dev_attr_emul_temp
);
1547 /* Create policy attribute */
1548 result
= device_create_file(&tz
->device
, &dev_attr_policy
);
1552 /* Update 'this' zone's governor information */
1553 mutex_lock(&thermal_governor_lock
);
1556 tz
->governor
= __find_governor(tz
->tzp
->governor_name
);
1558 tz
->governor
= def_governor
;
1560 mutex_unlock(&thermal_governor_lock
);
1562 if (!tz
->tzp
|| !tz
->tzp
->no_hwmon
) {
1563 result
= thermal_add_hwmon_sysfs(tz
);
1568 mutex_lock(&thermal_list_lock
);
1569 list_add_tail(&tz
->node
, &thermal_tz_list
);
1570 mutex_unlock(&thermal_list_lock
);
1572 /* Bind cooling devices for this zone */
1575 INIT_DELAYED_WORK(&(tz
->poll_queue
), thermal_zone_device_check
);
1577 if (!tz
->ops
->get_temp
)
1578 thermal_zone_device_set_polling(tz
, 0);
1580 thermal_zone_device_update(tz
);
1585 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
1586 device_unregister(&tz
->device
);
1587 return ERR_PTR(result
);
1589 EXPORT_SYMBOL_GPL(thermal_zone_device_register
);
1592 * thermal_device_unregister - removes the registered thermal zone device
1593 * @tz: the thermal zone device to remove
1595 void thermal_zone_device_unregister(struct thermal_zone_device
*tz
)
1598 const struct thermal_zone_params
*tzp
;
1599 struct thermal_cooling_device
*cdev
;
1600 struct thermal_zone_device
*pos
= NULL
;
1607 mutex_lock(&thermal_list_lock
);
1608 list_for_each_entry(pos
, &thermal_tz_list
, node
)
1612 /* thermal zone device not found */
1613 mutex_unlock(&thermal_list_lock
);
1616 list_del(&tz
->node
);
1618 /* Unbind all cdevs associated with 'this' thermal zone */
1619 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
1620 if (tz
->ops
->unbind
) {
1621 tz
->ops
->unbind(tz
, cdev
);
1625 if (!tzp
|| !tzp
->tbp
)
1628 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
1629 if (tzp
->tbp
[i
].cdev
== cdev
) {
1630 __unbind(tz
, tzp
->tbp
[i
].trip_mask
, cdev
);
1631 tzp
->tbp
[i
].cdev
= NULL
;
1636 mutex_unlock(&thermal_list_lock
);
1638 thermal_zone_device_set_polling(tz
, 0);
1641 device_remove_file(&tz
->device
, &dev_attr_type
);
1642 device_remove_file(&tz
->device
, &dev_attr_temp
);
1643 if (tz
->ops
->get_mode
)
1644 device_remove_file(&tz
->device
, &dev_attr_mode
);
1645 device_remove_file(&tz
->device
, &dev_attr_policy
);
1646 remove_trip_attrs(tz
);
1647 tz
->governor
= NULL
;
1649 thermal_remove_hwmon_sysfs(tz
);
1650 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
1651 idr_destroy(&tz
->idr
);
1652 mutex_destroy(&tz
->lock
);
1653 device_unregister(&tz
->device
);
1656 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister
);
1659 * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1660 * @name: thermal zone name to fetch the temperature
1662 * When only one zone is found with the passed name, returns a reference to it.
1664 * Return: On success returns a reference to an unique thermal zone with
1665 * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1666 * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1668 struct thermal_zone_device
*thermal_zone_get_zone_by_name(const char *name
)
1670 struct thermal_zone_device
*pos
= NULL
, *ref
= ERR_PTR(-EINVAL
);
1671 unsigned int found
= 0;
1676 mutex_lock(&thermal_list_lock
);
1677 list_for_each_entry(pos
, &thermal_tz_list
, node
)
1678 if (!strncasecmp(name
, pos
->type
, THERMAL_NAME_LENGTH
)) {
1682 mutex_unlock(&thermal_list_lock
);
1684 /* nothing has been found, thus an error code for it */
1686 ref
= ERR_PTR(-ENODEV
);
1688 /* Success only when an unique zone is found */
1689 ref
= ERR_PTR(-EEXIST
);
1694 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name
);
1697 static const struct genl_multicast_group thermal_event_mcgrps
[] = {
1698 { .name
= THERMAL_GENL_MCAST_GROUP_NAME
, },
1701 static struct genl_family thermal_event_genl_family
= {
1702 .id
= GENL_ID_GENERATE
,
1703 .name
= THERMAL_GENL_FAMILY_NAME
,
1704 .version
= THERMAL_GENL_VERSION
,
1705 .maxattr
= THERMAL_GENL_ATTR_MAX
,
1706 .mcgrps
= thermal_event_mcgrps
,
1707 .n_mcgrps
= ARRAY_SIZE(thermal_event_mcgrps
),
1710 int thermal_generate_netlink_event(struct thermal_zone_device
*tz
,
1713 struct sk_buff
*skb
;
1714 struct nlattr
*attr
;
1715 struct thermal_genl_event
*thermal_event
;
1719 static unsigned int thermal_event_seqnum
;
1724 /* allocate memory */
1725 size
= nla_total_size(sizeof(struct thermal_genl_event
)) +
1728 skb
= genlmsg_new(size
, GFP_ATOMIC
);
1732 /* add the genetlink message header */
1733 msg_header
= genlmsg_put(skb
, 0, thermal_event_seqnum
++,
1734 &thermal_event_genl_family
, 0,
1735 THERMAL_GENL_CMD_EVENT
);
1742 attr
= nla_reserve(skb
, THERMAL_GENL_ATTR_EVENT
,
1743 sizeof(struct thermal_genl_event
));
1750 thermal_event
= nla_data(attr
);
1751 if (!thermal_event
) {
1756 memset(thermal_event
, 0, sizeof(struct thermal_genl_event
));
1758 thermal_event
->orig
= tz
->id
;
1759 thermal_event
->event
= event
;
1761 /* send multicast genetlink message */
1762 result
= genlmsg_end(skb
, msg_header
);
1768 result
= genlmsg_multicast(&thermal_event_genl_family
, skb
, 0,
1771 dev_err(&tz
->device
, "Failed to send netlink event:%d", result
);
1775 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event
);
1777 static int genetlink_init(void)
1779 return genl_register_family(&thermal_event_genl_family
);
1782 static void genetlink_exit(void)
1784 genl_unregister_family(&thermal_event_genl_family
);
1786 #else /* !CONFIG_NET */
1787 static inline int genetlink_init(void) { return 0; }
1788 static inline void genetlink_exit(void) {}
1789 #endif /* !CONFIG_NET */
1791 static int __init
thermal_register_governors(void)
1795 result
= thermal_gov_step_wise_register();
1799 result
= thermal_gov_fair_share_register();
1803 result
= thermal_gov_bang_bang_register();
1807 return thermal_gov_user_space_register();
1810 static void thermal_unregister_governors(void)
1812 thermal_gov_step_wise_unregister();
1813 thermal_gov_fair_share_unregister();
1814 thermal_gov_bang_bang_unregister();
1815 thermal_gov_user_space_unregister();
1818 static int __init
thermal_init(void)
1822 result
= thermal_register_governors();
1826 result
= class_register(&thermal_class
);
1828 goto unregister_governors
;
1830 result
= genetlink_init();
1832 goto unregister_class
;
1834 result
= of_parse_thermal_zones();
1843 class_unregister(&thermal_class
);
1844 unregister_governors
:
1845 thermal_unregister_governors();
1847 idr_destroy(&thermal_tz_idr
);
1848 idr_destroy(&thermal_cdev_idr
);
1849 mutex_destroy(&thermal_idr_lock
);
1850 mutex_destroy(&thermal_list_lock
);
1851 mutex_destroy(&thermal_governor_lock
);
1855 static void __exit
thermal_exit(void)
1857 of_thermal_destroy_zones();
1859 class_unregister(&thermal_class
);
1860 thermal_unregister_governors();
1861 idr_destroy(&thermal_tz_idr
);
1862 idr_destroy(&thermal_cdev_idr
);
1863 mutex_destroy(&thermal_idr_lock
);
1864 mutex_destroy(&thermal_list_lock
);
1865 mutex_destroy(&thermal_governor_lock
);
1868 fs_initcall(thermal_init
);
1869 module_exit(thermal_exit
);