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 (!strnicmp(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 (!strnicmp(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 (!strnicmp(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 (tz
->temperature
< trip_temp
)
375 tz
->ops
->notify(tz
, trip
, trip_type
);
377 if (trip_type
== THERMAL_TRIP_CRITICAL
) {
378 dev_emerg(&tz
->device
,
379 "critical temperature reached(%d C),shutting down\n",
380 tz
->temperature
/ 1000);
381 orderly_poweroff(true);
385 static void handle_thermal_trip(struct thermal_zone_device
*tz
, int trip
)
387 enum thermal_trip_type type
;
389 tz
->ops
->get_trip_type(tz
, trip
, &type
);
391 if (type
== THERMAL_TRIP_CRITICAL
|| type
== THERMAL_TRIP_HOT
)
392 handle_critical_trips(tz
, trip
, type
);
394 handle_non_critical_trips(tz
, trip
, type
);
396 * Alright, we handled this trip successfully.
397 * So, start monitoring again.
399 monitor_thermal_zone(tz
);
403 * thermal_zone_get_temp() - returns its the temperature of thermal zone
404 * @tz: a valid pointer to a struct thermal_zone_device
405 * @temp: a valid pointer to where to store the resulting temperature.
407 * When a valid thermal zone reference is passed, it will fetch its
408 * temperature and fill @temp.
410 * Return: On success returns 0, an error code otherwise
412 int thermal_zone_get_temp(struct thermal_zone_device
*tz
, unsigned long *temp
)
415 #ifdef CONFIG_THERMAL_EMULATION
417 unsigned long crit_temp
= -1UL;
418 enum thermal_trip_type type
;
421 if (!tz
|| IS_ERR(tz
) || !tz
->ops
->get_temp
)
424 mutex_lock(&tz
->lock
);
426 ret
= tz
->ops
->get_temp(tz
, temp
);
427 #ifdef CONFIG_THERMAL_EMULATION
428 if (!tz
->emul_temperature
)
431 for (count
= 0; count
< tz
->trips
; count
++) {
432 ret
= tz
->ops
->get_trip_type(tz
, count
, &type
);
433 if (!ret
&& type
== THERMAL_TRIP_CRITICAL
) {
434 ret
= tz
->ops
->get_trip_temp(tz
, count
, &crit_temp
);
442 if (*temp
< crit_temp
)
443 *temp
= tz
->emul_temperature
;
446 mutex_unlock(&tz
->lock
);
450 EXPORT_SYMBOL_GPL(thermal_zone_get_temp
);
452 static void update_temperature(struct thermal_zone_device
*tz
)
457 ret
= thermal_zone_get_temp(tz
, &temp
);
459 dev_warn(&tz
->device
, "failed to read out thermal zone %d\n",
464 mutex_lock(&tz
->lock
);
465 tz
->last_temperature
= tz
->temperature
;
466 tz
->temperature
= temp
;
467 mutex_unlock(&tz
->lock
);
469 trace_thermal_temperature(tz
);
470 dev_dbg(&tz
->device
, "last_temperature=%d, current_temperature=%d\n",
471 tz
->last_temperature
, tz
->temperature
);
474 void thermal_zone_device_update(struct thermal_zone_device
*tz
)
478 if (!tz
->ops
->get_temp
)
481 update_temperature(tz
);
483 for (count
= 0; count
< tz
->trips
; count
++)
484 handle_thermal_trip(tz
, count
);
486 EXPORT_SYMBOL_GPL(thermal_zone_device_update
);
488 static void thermal_zone_device_check(struct work_struct
*work
)
490 struct thermal_zone_device
*tz
= container_of(work
, struct
493 thermal_zone_device_update(tz
);
496 /* sys I/F for thermal zone */
498 #define to_thermal_zone(_dev) \
499 container_of(_dev, struct thermal_zone_device, device)
502 type_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
504 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
506 return sprintf(buf
, "%s\n", tz
->type
);
510 temp_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
512 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
516 ret
= thermal_zone_get_temp(tz
, &temperature
);
521 return sprintf(buf
, "%ld\n", temperature
);
525 mode_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
527 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
528 enum thermal_device_mode mode
;
531 if (!tz
->ops
->get_mode
)
534 result
= tz
->ops
->get_mode(tz
, &mode
);
538 return sprintf(buf
, "%s\n", mode
== THERMAL_DEVICE_ENABLED
? "enabled"
543 mode_store(struct device
*dev
, struct device_attribute
*attr
,
544 const char *buf
, size_t count
)
546 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
549 if (!tz
->ops
->set_mode
)
552 if (!strncmp(buf
, "enabled", sizeof("enabled") - 1))
553 result
= tz
->ops
->set_mode(tz
, THERMAL_DEVICE_ENABLED
);
554 else if (!strncmp(buf
, "disabled", sizeof("disabled") - 1))
555 result
= tz
->ops
->set_mode(tz
, THERMAL_DEVICE_DISABLED
);
566 trip_point_type_show(struct device
*dev
, struct device_attribute
*attr
,
569 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
570 enum thermal_trip_type type
;
573 if (!tz
->ops
->get_trip_type
)
576 if (!sscanf(attr
->attr
.name
, "trip_point_%d_type", &trip
))
579 result
= tz
->ops
->get_trip_type(tz
, trip
, &type
);
584 case THERMAL_TRIP_CRITICAL
:
585 return sprintf(buf
, "critical\n");
586 case THERMAL_TRIP_HOT
:
587 return sprintf(buf
, "hot\n");
588 case THERMAL_TRIP_PASSIVE
:
589 return sprintf(buf
, "passive\n");
590 case THERMAL_TRIP_ACTIVE
:
591 return sprintf(buf
, "active\n");
593 return sprintf(buf
, "unknown\n");
598 trip_point_temp_store(struct device
*dev
, struct device_attribute
*attr
,
599 const char *buf
, size_t count
)
601 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
603 unsigned long temperature
;
605 if (!tz
->ops
->set_trip_temp
)
608 if (!sscanf(attr
->attr
.name
, "trip_point_%d_temp", &trip
))
611 if (kstrtoul(buf
, 10, &temperature
))
614 ret
= tz
->ops
->set_trip_temp(tz
, trip
, temperature
);
616 return ret
? ret
: count
;
620 trip_point_temp_show(struct device
*dev
, struct device_attribute
*attr
,
623 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
627 if (!tz
->ops
->get_trip_temp
)
630 if (!sscanf(attr
->attr
.name
, "trip_point_%d_temp", &trip
))
633 ret
= tz
->ops
->get_trip_temp(tz
, trip
, &temperature
);
638 return sprintf(buf
, "%ld\n", temperature
);
642 trip_point_hyst_store(struct device
*dev
, struct device_attribute
*attr
,
643 const char *buf
, size_t count
)
645 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
647 unsigned long temperature
;
649 if (!tz
->ops
->set_trip_hyst
)
652 if (!sscanf(attr
->attr
.name
, "trip_point_%d_hyst", &trip
))
655 if (kstrtoul(buf
, 10, &temperature
))
659 * We are not doing any check on the 'temperature' value
660 * here. The driver implementing 'set_trip_hyst' has to
663 ret
= tz
->ops
->set_trip_hyst(tz
, trip
, temperature
);
665 return ret
? ret
: count
;
669 trip_point_hyst_show(struct device
*dev
, struct device_attribute
*attr
,
672 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
674 unsigned long temperature
;
676 if (!tz
->ops
->get_trip_hyst
)
679 if (!sscanf(attr
->attr
.name
, "trip_point_%d_hyst", &trip
))
682 ret
= tz
->ops
->get_trip_hyst(tz
, trip
, &temperature
);
684 return ret
? ret
: sprintf(buf
, "%ld\n", temperature
);
688 passive_store(struct device
*dev
, struct device_attribute
*attr
,
689 const char *buf
, size_t count
)
691 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
692 struct thermal_cooling_device
*cdev
= NULL
;
695 if (!sscanf(buf
, "%d\n", &state
))
698 /* sanity check: values below 1000 millicelcius don't make sense
699 * and can cause the system to go into a thermal heart attack
701 if (state
&& state
< 1000)
704 if (state
&& !tz
->forced_passive
) {
705 mutex_lock(&thermal_list_lock
);
706 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
707 if (!strncmp("Processor", cdev
->type
,
708 sizeof("Processor")))
709 thermal_zone_bind_cooling_device(tz
,
710 THERMAL_TRIPS_NONE
, cdev
,
714 mutex_unlock(&thermal_list_lock
);
715 if (!tz
->passive_delay
)
716 tz
->passive_delay
= 1000;
717 } else if (!state
&& tz
->forced_passive
) {
718 mutex_lock(&thermal_list_lock
);
719 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
720 if (!strncmp("Processor", cdev
->type
,
721 sizeof("Processor")))
722 thermal_zone_unbind_cooling_device(tz
,
726 mutex_unlock(&thermal_list_lock
);
727 tz
->passive_delay
= 0;
730 tz
->forced_passive
= state
;
732 thermal_zone_device_update(tz
);
738 passive_show(struct device
*dev
, struct device_attribute
*attr
,
741 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
743 return sprintf(buf
, "%d\n", tz
->forced_passive
);
747 policy_store(struct device
*dev
, struct device_attribute
*attr
,
748 const char *buf
, size_t count
)
751 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
752 struct thermal_governor
*gov
;
753 char name
[THERMAL_NAME_LENGTH
];
755 snprintf(name
, sizeof(name
), "%s", buf
);
757 mutex_lock(&thermal_governor_lock
);
759 gov
= __find_governor(strim(name
));
767 mutex_unlock(&thermal_governor_lock
);
772 policy_show(struct device
*dev
, struct device_attribute
*devattr
, char *buf
)
774 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
776 return sprintf(buf
, "%s\n", tz
->governor
->name
);
779 #ifdef CONFIG_THERMAL_EMULATION
781 emul_temp_store(struct device
*dev
, struct device_attribute
*attr
,
782 const char *buf
, size_t count
)
784 struct thermal_zone_device
*tz
= to_thermal_zone(dev
);
786 unsigned long temperature
;
788 if (kstrtoul(buf
, 10, &temperature
))
791 if (!tz
->ops
->set_emul_temp
) {
792 mutex_lock(&tz
->lock
);
793 tz
->emul_temperature
= temperature
;
794 mutex_unlock(&tz
->lock
);
796 ret
= tz
->ops
->set_emul_temp(tz
, temperature
);
800 thermal_zone_device_update(tz
);
802 return ret
? ret
: count
;
804 static DEVICE_ATTR(emul_temp
, S_IWUSR
, NULL
, emul_temp_store
);
805 #endif/*CONFIG_THERMAL_EMULATION*/
807 static DEVICE_ATTR(type
, 0444, type_show
, NULL
);
808 static DEVICE_ATTR(temp
, 0444, temp_show
, NULL
);
809 static DEVICE_ATTR(mode
, 0644, mode_show
, mode_store
);
810 static DEVICE_ATTR(passive
, S_IRUGO
| S_IWUSR
, passive_show
, passive_store
);
811 static DEVICE_ATTR(policy
, S_IRUGO
| S_IWUSR
, policy_show
, policy_store
);
813 /* sys I/F for cooling device */
814 #define to_cooling_device(_dev) \
815 container_of(_dev, struct thermal_cooling_device, device)
818 thermal_cooling_device_type_show(struct device
*dev
,
819 struct device_attribute
*attr
, char *buf
)
821 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
823 return sprintf(buf
, "%s\n", cdev
->type
);
827 thermal_cooling_device_max_state_show(struct device
*dev
,
828 struct device_attribute
*attr
, char *buf
)
830 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
834 ret
= cdev
->ops
->get_max_state(cdev
, &state
);
837 return sprintf(buf
, "%ld\n", state
);
841 thermal_cooling_device_cur_state_show(struct device
*dev
,
842 struct device_attribute
*attr
, char *buf
)
844 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
848 ret
= cdev
->ops
->get_cur_state(cdev
, &state
);
851 return sprintf(buf
, "%ld\n", state
);
855 thermal_cooling_device_cur_state_store(struct device
*dev
,
856 struct device_attribute
*attr
,
857 const char *buf
, size_t count
)
859 struct thermal_cooling_device
*cdev
= to_cooling_device(dev
);
863 if (!sscanf(buf
, "%ld\n", &state
))
869 result
= cdev
->ops
->set_cur_state(cdev
, state
);
875 static struct device_attribute dev_attr_cdev_type
=
876 __ATTR(type
, 0444, thermal_cooling_device_type_show
, NULL
);
877 static DEVICE_ATTR(max_state
, 0444,
878 thermal_cooling_device_max_state_show
, NULL
);
879 static DEVICE_ATTR(cur_state
, 0644,
880 thermal_cooling_device_cur_state_show
,
881 thermal_cooling_device_cur_state_store
);
884 thermal_cooling_device_trip_point_show(struct device
*dev
,
885 struct device_attribute
*attr
, char *buf
)
887 struct thermal_instance
*instance
;
890 container_of(attr
, struct thermal_instance
, attr
);
892 if (instance
->trip
== THERMAL_TRIPS_NONE
)
893 return sprintf(buf
, "-1\n");
895 return sprintf(buf
, "%d\n", instance
->trip
);
898 /* Device management */
901 * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
902 * @tz: pointer to struct thermal_zone_device
903 * @trip: indicates which trip point the cooling devices is
904 * associated with in this thermal zone.
905 * @cdev: pointer to struct thermal_cooling_device
906 * @upper: the Maximum cooling state for this trip point.
907 * THERMAL_NO_LIMIT means no upper limit,
908 * and the cooling device can be in max_state.
909 * @lower: the Minimum cooling state can be used for this trip point.
910 * THERMAL_NO_LIMIT means no lower limit,
911 * and the cooling device can be in cooling state 0.
913 * This interface function bind a thermal cooling device to the certain trip
914 * point of a thermal zone device.
915 * This function is usually called in the thermal zone device .bind callback.
917 * Return: 0 on success, the proper error value otherwise.
919 int thermal_zone_bind_cooling_device(struct thermal_zone_device
*tz
,
921 struct thermal_cooling_device
*cdev
,
922 unsigned long upper
, unsigned long lower
)
924 struct thermal_instance
*dev
;
925 struct thermal_instance
*pos
;
926 struct thermal_zone_device
*pos1
;
927 struct thermal_cooling_device
*pos2
;
928 unsigned long max_state
;
931 if (trip
>= tz
->trips
|| (trip
< 0 && trip
!= THERMAL_TRIPS_NONE
))
934 list_for_each_entry(pos1
, &thermal_tz_list
, node
) {
938 list_for_each_entry(pos2
, &thermal_cdev_list
, node
) {
943 if (tz
!= pos1
|| cdev
!= pos2
)
946 cdev
->ops
->get_max_state(cdev
, &max_state
);
948 /* lower default 0, upper default max_state */
949 lower
= lower
== THERMAL_NO_LIMIT
? 0 : lower
;
950 upper
= upper
== THERMAL_NO_LIMIT
? max_state
: upper
;
952 if (lower
> upper
|| upper
> max_state
)
956 kzalloc(sizeof(struct thermal_instance
), GFP_KERNEL
);
964 dev
->target
= THERMAL_NO_TARGET
;
966 result
= get_idr(&tz
->idr
, &tz
->lock
, &dev
->id
);
970 sprintf(dev
->name
, "cdev%d", dev
->id
);
972 sysfs_create_link(&tz
->device
.kobj
, &cdev
->device
.kobj
, dev
->name
);
976 sprintf(dev
->attr_name
, "cdev%d_trip_point", dev
->id
);
977 sysfs_attr_init(&dev
->attr
.attr
);
978 dev
->attr
.attr
.name
= dev
->attr_name
;
979 dev
->attr
.attr
.mode
= 0444;
980 dev
->attr
.show
= thermal_cooling_device_trip_point_show
;
981 result
= device_create_file(&tz
->device
, &dev
->attr
);
983 goto remove_symbol_link
;
985 mutex_lock(&tz
->lock
);
986 mutex_lock(&cdev
->lock
);
987 list_for_each_entry(pos
, &tz
->thermal_instances
, tz_node
)
988 if (pos
->tz
== tz
&& pos
->trip
== trip
&& pos
->cdev
== cdev
) {
993 list_add_tail(&dev
->tz_node
, &tz
->thermal_instances
);
994 list_add_tail(&dev
->cdev_node
, &cdev
->thermal_instances
);
996 mutex_unlock(&cdev
->lock
);
997 mutex_unlock(&tz
->lock
);
1002 device_remove_file(&tz
->device
, &dev
->attr
);
1004 sysfs_remove_link(&tz
->device
.kobj
, dev
->name
);
1006 release_idr(&tz
->idr
, &tz
->lock
, dev
->id
);
1011 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device
);
1014 * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1016 * @tz: pointer to a struct thermal_zone_device.
1017 * @trip: indicates which trip point the cooling devices is
1018 * associated with in this thermal zone.
1019 * @cdev: pointer to a struct thermal_cooling_device.
1021 * This interface function unbind a thermal cooling device from the certain
1022 * trip point of a thermal zone device.
1023 * This function is usually called in the thermal zone device .unbind callback.
1025 * Return: 0 on success, the proper error value otherwise.
1027 int thermal_zone_unbind_cooling_device(struct thermal_zone_device
*tz
,
1029 struct thermal_cooling_device
*cdev
)
1031 struct thermal_instance
*pos
, *next
;
1033 mutex_lock(&tz
->lock
);
1034 mutex_lock(&cdev
->lock
);
1035 list_for_each_entry_safe(pos
, next
, &tz
->thermal_instances
, tz_node
) {
1036 if (pos
->tz
== tz
&& pos
->trip
== trip
&& pos
->cdev
== cdev
) {
1037 list_del(&pos
->tz_node
);
1038 list_del(&pos
->cdev_node
);
1039 mutex_unlock(&cdev
->lock
);
1040 mutex_unlock(&tz
->lock
);
1044 mutex_unlock(&cdev
->lock
);
1045 mutex_unlock(&tz
->lock
);
1050 device_remove_file(&tz
->device
, &pos
->attr
);
1051 sysfs_remove_link(&tz
->device
.kobj
, pos
->name
);
1052 release_idr(&tz
->idr
, &tz
->lock
, pos
->id
);
1056 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device
);
1058 static void thermal_release(struct device
*dev
)
1060 struct thermal_zone_device
*tz
;
1061 struct thermal_cooling_device
*cdev
;
1063 if (!strncmp(dev_name(dev
), "thermal_zone",
1064 sizeof("thermal_zone") - 1)) {
1065 tz
= to_thermal_zone(dev
);
1067 } else if(!strncmp(dev_name(dev
), "cooling_device",
1068 sizeof("cooling_device") - 1)){
1069 cdev
= to_cooling_device(dev
);
1074 static struct class thermal_class
= {
1076 .dev_release
= thermal_release
,
1080 * __thermal_cooling_device_register() - register a new thermal cooling device
1081 * @np: a pointer to a device tree node.
1082 * @type: the thermal cooling device type.
1083 * @devdata: device private data.
1084 * @ops: standard thermal cooling devices callbacks.
1086 * This interface function adds a new thermal cooling device (fan/processor/...)
1087 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1088 * to all the thermal zone devices registered at the same time.
1089 * It also gives the opportunity to link the cooling device to a device tree
1090 * node, so that it can be bound to a thermal zone created out of device tree.
1092 * Return: a pointer to the created struct thermal_cooling_device or an
1093 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1095 static struct thermal_cooling_device
*
1096 __thermal_cooling_device_register(struct device_node
*np
,
1097 char *type
, void *devdata
,
1098 const struct thermal_cooling_device_ops
*ops
)
1100 struct thermal_cooling_device
*cdev
;
1103 if (type
&& strlen(type
) >= THERMAL_NAME_LENGTH
)
1104 return ERR_PTR(-EINVAL
);
1106 if (!ops
|| !ops
->get_max_state
|| !ops
->get_cur_state
||
1107 !ops
->set_cur_state
)
1108 return ERR_PTR(-EINVAL
);
1110 cdev
= kzalloc(sizeof(struct thermal_cooling_device
), GFP_KERNEL
);
1112 return ERR_PTR(-ENOMEM
);
1114 result
= get_idr(&thermal_cdev_idr
, &thermal_idr_lock
, &cdev
->id
);
1117 return ERR_PTR(result
);
1120 strlcpy(cdev
->type
, type
? : "", sizeof(cdev
->type
));
1121 mutex_init(&cdev
->lock
);
1122 INIT_LIST_HEAD(&cdev
->thermal_instances
);
1125 cdev
->updated
= false;
1126 cdev
->device
.class = &thermal_class
;
1127 cdev
->devdata
= devdata
;
1128 dev_set_name(&cdev
->device
, "cooling_device%d", cdev
->id
);
1129 result
= device_register(&cdev
->device
);
1131 release_idr(&thermal_cdev_idr
, &thermal_idr_lock
, cdev
->id
);
1133 return ERR_PTR(result
);
1138 result
= device_create_file(&cdev
->device
, &dev_attr_cdev_type
);
1143 result
= device_create_file(&cdev
->device
, &dev_attr_max_state
);
1147 result
= device_create_file(&cdev
->device
, &dev_attr_cur_state
);
1151 /* Add 'this' new cdev to the global cdev list */
1152 mutex_lock(&thermal_list_lock
);
1153 list_add(&cdev
->node
, &thermal_cdev_list
);
1154 mutex_unlock(&thermal_list_lock
);
1156 /* Update binding information for 'this' new cdev */
1162 release_idr(&thermal_cdev_idr
, &thermal_idr_lock
, cdev
->id
);
1163 device_unregister(&cdev
->device
);
1164 return ERR_PTR(result
);
1168 * thermal_cooling_device_register() - register a new thermal cooling device
1169 * @type: the thermal cooling device type.
1170 * @devdata: device private data.
1171 * @ops: standard thermal cooling devices callbacks.
1173 * This interface function adds a new thermal cooling device (fan/processor/...)
1174 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1175 * to all the thermal zone devices registered at the same time.
1177 * Return: a pointer to the created struct thermal_cooling_device or an
1178 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1180 struct thermal_cooling_device
*
1181 thermal_cooling_device_register(char *type
, void *devdata
,
1182 const struct thermal_cooling_device_ops
*ops
)
1184 return __thermal_cooling_device_register(NULL
, type
, devdata
, ops
);
1186 EXPORT_SYMBOL_GPL(thermal_cooling_device_register
);
1189 * thermal_of_cooling_device_register() - register an OF thermal cooling device
1190 * @np: a pointer to a device tree node.
1191 * @type: the thermal cooling device type.
1192 * @devdata: device private data.
1193 * @ops: standard thermal cooling devices callbacks.
1195 * This function will register a cooling device with device tree node reference.
1196 * This interface function adds a new thermal cooling device (fan/processor/...)
1197 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1198 * to all the thermal zone devices registered at the same time.
1200 * Return: a pointer to the created struct thermal_cooling_device or an
1201 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1203 struct thermal_cooling_device
*
1204 thermal_of_cooling_device_register(struct device_node
*np
,
1205 char *type
, void *devdata
,
1206 const struct thermal_cooling_device_ops
*ops
)
1208 return __thermal_cooling_device_register(np
, type
, devdata
, ops
);
1210 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register
);
1213 * thermal_cooling_device_unregister - removes the registered thermal cooling device
1214 * @cdev: the thermal cooling device to remove.
1216 * thermal_cooling_device_unregister() must be called when the device is no
1219 void thermal_cooling_device_unregister(struct thermal_cooling_device
*cdev
)
1222 const struct thermal_zone_params
*tzp
;
1223 struct thermal_zone_device
*tz
;
1224 struct thermal_cooling_device
*pos
= NULL
;
1229 mutex_lock(&thermal_list_lock
);
1230 list_for_each_entry(pos
, &thermal_cdev_list
, node
)
1234 /* thermal cooling device not found */
1235 mutex_unlock(&thermal_list_lock
);
1238 list_del(&cdev
->node
);
1240 /* Unbind all thermal zones associated with 'this' cdev */
1241 list_for_each_entry(tz
, &thermal_tz_list
, node
) {
1242 if (tz
->ops
->unbind
) {
1243 tz
->ops
->unbind(tz
, cdev
);
1247 if (!tz
->tzp
|| !tz
->tzp
->tbp
)
1251 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
1252 if (tzp
->tbp
[i
].cdev
== cdev
) {
1253 __unbind(tz
, tzp
->tbp
[i
].trip_mask
, cdev
);
1254 tzp
->tbp
[i
].cdev
= NULL
;
1259 mutex_unlock(&thermal_list_lock
);
1262 device_remove_file(&cdev
->device
, &dev_attr_cdev_type
);
1263 device_remove_file(&cdev
->device
, &dev_attr_max_state
);
1264 device_remove_file(&cdev
->device
, &dev_attr_cur_state
);
1266 release_idr(&thermal_cdev_idr
, &thermal_idr_lock
, cdev
->id
);
1267 device_unregister(&cdev
->device
);
1270 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister
);
1272 void thermal_cdev_update(struct thermal_cooling_device
*cdev
)
1274 struct thermal_instance
*instance
;
1275 unsigned long target
= 0;
1277 /* cooling device is updated*/
1281 mutex_lock(&cdev
->lock
);
1282 /* Make sure cdev enters the deepest cooling state */
1283 list_for_each_entry(instance
, &cdev
->thermal_instances
, cdev_node
) {
1284 dev_dbg(&cdev
->device
, "zone%d->target=%lu\n",
1285 instance
->tz
->id
, instance
->target
);
1286 if (instance
->target
== THERMAL_NO_TARGET
)
1288 if (instance
->target
> target
)
1289 target
= instance
->target
;
1291 mutex_unlock(&cdev
->lock
);
1292 cdev
->ops
->set_cur_state(cdev
, target
);
1293 cdev
->updated
= true;
1294 trace_cdev_update(cdev
, target
);
1295 dev_dbg(&cdev
->device
, "set to state %lu\n", target
);
1297 EXPORT_SYMBOL(thermal_cdev_update
);
1300 * thermal_notify_framework - Sensor drivers use this API to notify framework
1301 * @tz: thermal zone device
1302 * @trip: indicates which trip point has been crossed
1304 * This function handles the trip events from sensor drivers. It starts
1305 * throttling the cooling devices according to the policy configured.
1306 * For CRITICAL and HOT trip points, this notifies the respective drivers,
1307 * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1308 * The throttling policy is based on the configured platform data; if no
1309 * platform data is provided, this uses the step_wise throttling policy.
1311 void thermal_notify_framework(struct thermal_zone_device
*tz
, int trip
)
1313 handle_thermal_trip(tz
, trip
);
1315 EXPORT_SYMBOL_GPL(thermal_notify_framework
);
1318 * create_trip_attrs() - create attributes for trip points
1319 * @tz: the thermal zone device
1320 * @mask: Writeable trip point bitmap.
1322 * helper function to instantiate sysfs entries for every trip
1323 * point and its properties of a struct thermal_zone_device.
1325 * Return: 0 on success, the proper error value otherwise.
1327 static int create_trip_attrs(struct thermal_zone_device
*tz
, int mask
)
1330 int size
= sizeof(struct thermal_attr
) * tz
->trips
;
1332 tz
->trip_type_attrs
= kzalloc(size
, GFP_KERNEL
);
1333 if (!tz
->trip_type_attrs
)
1336 tz
->trip_temp_attrs
= kzalloc(size
, GFP_KERNEL
);
1337 if (!tz
->trip_temp_attrs
) {
1338 kfree(tz
->trip_type_attrs
);
1342 if (tz
->ops
->get_trip_hyst
) {
1343 tz
->trip_hyst_attrs
= kzalloc(size
, GFP_KERNEL
);
1344 if (!tz
->trip_hyst_attrs
) {
1345 kfree(tz
->trip_type_attrs
);
1346 kfree(tz
->trip_temp_attrs
);
1352 for (indx
= 0; indx
< tz
->trips
; indx
++) {
1353 /* create trip type attribute */
1354 snprintf(tz
->trip_type_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1355 "trip_point_%d_type", indx
);
1357 sysfs_attr_init(&tz
->trip_type_attrs
[indx
].attr
.attr
);
1358 tz
->trip_type_attrs
[indx
].attr
.attr
.name
=
1359 tz
->trip_type_attrs
[indx
].name
;
1360 tz
->trip_type_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1361 tz
->trip_type_attrs
[indx
].attr
.show
= trip_point_type_show
;
1363 device_create_file(&tz
->device
,
1364 &tz
->trip_type_attrs
[indx
].attr
);
1366 /* create trip temp attribute */
1367 snprintf(tz
->trip_temp_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1368 "trip_point_%d_temp", indx
);
1370 sysfs_attr_init(&tz
->trip_temp_attrs
[indx
].attr
.attr
);
1371 tz
->trip_temp_attrs
[indx
].attr
.attr
.name
=
1372 tz
->trip_temp_attrs
[indx
].name
;
1373 tz
->trip_temp_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1374 tz
->trip_temp_attrs
[indx
].attr
.show
= trip_point_temp_show
;
1375 if (mask
& (1 << indx
)) {
1376 tz
->trip_temp_attrs
[indx
].attr
.attr
.mode
|= S_IWUSR
;
1377 tz
->trip_temp_attrs
[indx
].attr
.store
=
1378 trip_point_temp_store
;
1381 device_create_file(&tz
->device
,
1382 &tz
->trip_temp_attrs
[indx
].attr
);
1384 /* create Optional trip hyst attribute */
1385 if (!tz
->ops
->get_trip_hyst
)
1387 snprintf(tz
->trip_hyst_attrs
[indx
].name
, THERMAL_NAME_LENGTH
,
1388 "trip_point_%d_hyst", indx
);
1390 sysfs_attr_init(&tz
->trip_hyst_attrs
[indx
].attr
.attr
);
1391 tz
->trip_hyst_attrs
[indx
].attr
.attr
.name
=
1392 tz
->trip_hyst_attrs
[indx
].name
;
1393 tz
->trip_hyst_attrs
[indx
].attr
.attr
.mode
= S_IRUGO
;
1394 tz
->trip_hyst_attrs
[indx
].attr
.show
= trip_point_hyst_show
;
1395 if (tz
->ops
->set_trip_hyst
) {
1396 tz
->trip_hyst_attrs
[indx
].attr
.attr
.mode
|= S_IWUSR
;
1397 tz
->trip_hyst_attrs
[indx
].attr
.store
=
1398 trip_point_hyst_store
;
1401 device_create_file(&tz
->device
,
1402 &tz
->trip_hyst_attrs
[indx
].attr
);
1407 static void remove_trip_attrs(struct thermal_zone_device
*tz
)
1411 for (indx
= 0; indx
< tz
->trips
; indx
++) {
1412 device_remove_file(&tz
->device
,
1413 &tz
->trip_type_attrs
[indx
].attr
);
1414 device_remove_file(&tz
->device
,
1415 &tz
->trip_temp_attrs
[indx
].attr
);
1416 if (tz
->ops
->get_trip_hyst
)
1417 device_remove_file(&tz
->device
,
1418 &tz
->trip_hyst_attrs
[indx
].attr
);
1420 kfree(tz
->trip_type_attrs
);
1421 kfree(tz
->trip_temp_attrs
);
1422 kfree(tz
->trip_hyst_attrs
);
1426 * thermal_zone_device_register() - register a new thermal zone device
1427 * @type: the thermal zone device type
1428 * @trips: the number of trip points the thermal zone support
1429 * @mask: a bit string indicating the writeablility of trip points
1430 * @devdata: private device data
1431 * @ops: standard thermal zone device callbacks
1432 * @tzp: thermal zone platform parameters
1433 * @passive_delay: number of milliseconds to wait between polls when
1434 * performing passive cooling
1435 * @polling_delay: number of milliseconds to wait between polls when checking
1436 * whether trip points have been crossed (0 for interrupt
1439 * This interface function adds a new thermal zone device (sensor) to
1440 * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1441 * thermal cooling devices registered at the same time.
1442 * thermal_zone_device_unregister() must be called when the device is no
1443 * longer needed. The passive cooling depends on the .get_trend() return value.
1445 * Return: a pointer to the created struct thermal_zone_device or an
1446 * in case of error, an ERR_PTR. Caller must check return value with
1447 * IS_ERR*() helpers.
1449 struct thermal_zone_device
*thermal_zone_device_register(const char *type
,
1450 int trips
, int mask
, void *devdata
,
1451 struct thermal_zone_device_ops
*ops
,
1452 const struct thermal_zone_params
*tzp
,
1453 int passive_delay
, int polling_delay
)
1455 struct thermal_zone_device
*tz
;
1456 enum thermal_trip_type trip_type
;
1461 if (type
&& strlen(type
) >= THERMAL_NAME_LENGTH
)
1462 return ERR_PTR(-EINVAL
);
1464 if (trips
> THERMAL_MAX_TRIPS
|| trips
< 0 || mask
>> trips
)
1465 return ERR_PTR(-EINVAL
);
1468 return ERR_PTR(-EINVAL
);
1470 if (trips
> 0 && (!ops
->get_trip_type
|| !ops
->get_trip_temp
))
1471 return ERR_PTR(-EINVAL
);
1473 tz
= kzalloc(sizeof(struct thermal_zone_device
), GFP_KERNEL
);
1475 return ERR_PTR(-ENOMEM
);
1477 INIT_LIST_HEAD(&tz
->thermal_instances
);
1479 mutex_init(&tz
->lock
);
1480 result
= get_idr(&thermal_tz_idr
, &thermal_idr_lock
, &tz
->id
);
1483 return ERR_PTR(result
);
1486 strlcpy(tz
->type
, type
? : "", sizeof(tz
->type
));
1489 tz
->device
.class = &thermal_class
;
1490 tz
->devdata
= devdata
;
1492 tz
->passive_delay
= passive_delay
;
1493 tz
->polling_delay
= polling_delay
;
1495 dev_set_name(&tz
->device
, "thermal_zone%d", tz
->id
);
1496 result
= device_register(&tz
->device
);
1498 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
1500 return ERR_PTR(result
);
1505 result
= device_create_file(&tz
->device
, &dev_attr_type
);
1510 result
= device_create_file(&tz
->device
, &dev_attr_temp
);
1514 if (ops
->get_mode
) {
1515 result
= device_create_file(&tz
->device
, &dev_attr_mode
);
1520 result
= create_trip_attrs(tz
, mask
);
1524 for (count
= 0; count
< trips
; count
++) {
1525 tz
->ops
->get_trip_type(tz
, count
, &trip_type
);
1526 if (trip_type
== THERMAL_TRIP_PASSIVE
)
1531 result
= device_create_file(&tz
->device
, &dev_attr_passive
);
1536 #ifdef CONFIG_THERMAL_EMULATION
1537 result
= device_create_file(&tz
->device
, &dev_attr_emul_temp
);
1541 /* Create policy attribute */
1542 result
= device_create_file(&tz
->device
, &dev_attr_policy
);
1546 /* Update 'this' zone's governor information */
1547 mutex_lock(&thermal_governor_lock
);
1550 tz
->governor
= __find_governor(tz
->tzp
->governor_name
);
1552 tz
->governor
= def_governor
;
1554 mutex_unlock(&thermal_governor_lock
);
1556 if (!tz
->tzp
|| !tz
->tzp
->no_hwmon
) {
1557 result
= thermal_add_hwmon_sysfs(tz
);
1562 mutex_lock(&thermal_list_lock
);
1563 list_add_tail(&tz
->node
, &thermal_tz_list
);
1564 mutex_unlock(&thermal_list_lock
);
1566 /* Bind cooling devices for this zone */
1569 INIT_DELAYED_WORK(&(tz
->poll_queue
), thermal_zone_device_check
);
1571 if (!tz
->ops
->get_temp
)
1572 thermal_zone_device_set_polling(tz
, 0);
1574 thermal_zone_device_update(tz
);
1580 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
1581 device_unregister(&tz
->device
);
1582 return ERR_PTR(result
);
1584 EXPORT_SYMBOL_GPL(thermal_zone_device_register
);
1587 * thermal_device_unregister - removes the registered thermal zone device
1588 * @tz: the thermal zone device to remove
1590 void thermal_zone_device_unregister(struct thermal_zone_device
*tz
)
1593 const struct thermal_zone_params
*tzp
;
1594 struct thermal_cooling_device
*cdev
;
1595 struct thermal_zone_device
*pos
= NULL
;
1602 mutex_lock(&thermal_list_lock
);
1603 list_for_each_entry(pos
, &thermal_tz_list
, node
)
1607 /* thermal zone device not found */
1608 mutex_unlock(&thermal_list_lock
);
1611 list_del(&tz
->node
);
1613 /* Unbind all cdevs associated with 'this' thermal zone */
1614 list_for_each_entry(cdev
, &thermal_cdev_list
, node
) {
1615 if (tz
->ops
->unbind
) {
1616 tz
->ops
->unbind(tz
, cdev
);
1620 if (!tzp
|| !tzp
->tbp
)
1623 for (i
= 0; i
< tzp
->num_tbps
; i
++) {
1624 if (tzp
->tbp
[i
].cdev
== cdev
) {
1625 __unbind(tz
, tzp
->tbp
[i
].trip_mask
, cdev
);
1626 tzp
->tbp
[i
].cdev
= NULL
;
1631 mutex_unlock(&thermal_list_lock
);
1633 thermal_zone_device_set_polling(tz
, 0);
1636 device_remove_file(&tz
->device
, &dev_attr_type
);
1637 device_remove_file(&tz
->device
, &dev_attr_temp
);
1638 if (tz
->ops
->get_mode
)
1639 device_remove_file(&tz
->device
, &dev_attr_mode
);
1640 device_remove_file(&tz
->device
, &dev_attr_policy
);
1641 remove_trip_attrs(tz
);
1642 tz
->governor
= NULL
;
1644 thermal_remove_hwmon_sysfs(tz
);
1645 release_idr(&thermal_tz_idr
, &thermal_idr_lock
, tz
->id
);
1646 idr_destroy(&tz
->idr
);
1647 mutex_destroy(&tz
->lock
);
1648 device_unregister(&tz
->device
);
1651 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister
);
1654 * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1655 * @name: thermal zone name to fetch the temperature
1657 * When only one zone is found with the passed name, returns a reference to it.
1659 * Return: On success returns a reference to an unique thermal zone with
1660 * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1661 * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1663 struct thermal_zone_device
*thermal_zone_get_zone_by_name(const char *name
)
1665 struct thermal_zone_device
*pos
= NULL
, *ref
= ERR_PTR(-EINVAL
);
1666 unsigned int found
= 0;
1671 mutex_lock(&thermal_list_lock
);
1672 list_for_each_entry(pos
, &thermal_tz_list
, node
)
1673 if (!strnicmp(name
, pos
->type
, THERMAL_NAME_LENGTH
)) {
1677 mutex_unlock(&thermal_list_lock
);
1679 /* nothing has been found, thus an error code for it */
1681 ref
= ERR_PTR(-ENODEV
);
1683 /* Success only when an unique zone is found */
1684 ref
= ERR_PTR(-EEXIST
);
1689 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name
);
1692 static const struct genl_multicast_group thermal_event_mcgrps
[] = {
1693 { .name
= THERMAL_GENL_MCAST_GROUP_NAME
, },
1696 static struct genl_family thermal_event_genl_family
= {
1697 .id
= GENL_ID_GENERATE
,
1698 .name
= THERMAL_GENL_FAMILY_NAME
,
1699 .version
= THERMAL_GENL_VERSION
,
1700 .maxattr
= THERMAL_GENL_ATTR_MAX
,
1701 .mcgrps
= thermal_event_mcgrps
,
1702 .n_mcgrps
= ARRAY_SIZE(thermal_event_mcgrps
),
1705 int thermal_generate_netlink_event(struct thermal_zone_device
*tz
,
1708 struct sk_buff
*skb
;
1709 struct nlattr
*attr
;
1710 struct thermal_genl_event
*thermal_event
;
1714 static unsigned int thermal_event_seqnum
;
1719 /* allocate memory */
1720 size
= nla_total_size(sizeof(struct thermal_genl_event
)) +
1723 skb
= genlmsg_new(size
, GFP_ATOMIC
);
1727 /* add the genetlink message header */
1728 msg_header
= genlmsg_put(skb
, 0, thermal_event_seqnum
++,
1729 &thermal_event_genl_family
, 0,
1730 THERMAL_GENL_CMD_EVENT
);
1737 attr
= nla_reserve(skb
, THERMAL_GENL_ATTR_EVENT
,
1738 sizeof(struct thermal_genl_event
));
1745 thermal_event
= nla_data(attr
);
1746 if (!thermal_event
) {
1751 memset(thermal_event
, 0, sizeof(struct thermal_genl_event
));
1753 thermal_event
->orig
= tz
->id
;
1754 thermal_event
->event
= event
;
1756 /* send multicast genetlink message */
1757 result
= genlmsg_end(skb
, msg_header
);
1763 result
= genlmsg_multicast(&thermal_event_genl_family
, skb
, 0,
1766 dev_err(&tz
->device
, "Failed to send netlink event:%d", result
);
1770 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event
);
1772 static int genetlink_init(void)
1774 return genl_register_family(&thermal_event_genl_family
);
1777 static void genetlink_exit(void)
1779 genl_unregister_family(&thermal_event_genl_family
);
1781 #else /* !CONFIG_NET */
1782 static inline int genetlink_init(void) { return 0; }
1783 static inline void genetlink_exit(void) {}
1784 #endif /* !CONFIG_NET */
1786 static int __init
thermal_register_governors(void)
1790 result
= thermal_gov_step_wise_register();
1794 result
= thermal_gov_fair_share_register();
1798 return thermal_gov_user_space_register();
1801 static void thermal_unregister_governors(void)
1803 thermal_gov_step_wise_unregister();
1804 thermal_gov_fair_share_unregister();
1805 thermal_gov_user_space_unregister();
1808 static int __init
thermal_init(void)
1812 result
= thermal_register_governors();
1816 result
= class_register(&thermal_class
);
1818 goto unregister_governors
;
1820 result
= genetlink_init();
1822 goto unregister_class
;
1824 result
= of_parse_thermal_zones();
1832 unregister_governors
:
1833 thermal_unregister_governors();
1835 class_unregister(&thermal_class
);
1837 idr_destroy(&thermal_tz_idr
);
1838 idr_destroy(&thermal_cdev_idr
);
1839 mutex_destroy(&thermal_idr_lock
);
1840 mutex_destroy(&thermal_list_lock
);
1841 mutex_destroy(&thermal_governor_lock
);
1845 static void __exit
thermal_exit(void)
1847 of_thermal_destroy_zones();
1849 class_unregister(&thermal_class
);
1850 thermal_unregister_governors();
1851 idr_destroy(&thermal_tz_idr
);
1852 idr_destroy(&thermal_cdev_idr
);
1853 mutex_destroy(&thermal_idr_lock
);
1854 mutex_destroy(&thermal_list_lock
);
1855 mutex_destroy(&thermal_governor_lock
);
1858 fs_initcall(thermal_init
);
1859 module_exit(thermal_exit
);